BUG/MINOR: haterm: fix the random suffix multiplication

Passing a size or anything with suffix "r" is supposed to apply a
random factor form 0 to 1. However due to the replacement of random()
with ha_random64(), all 64 bits are random before the divide, so the
end result is a random 32-bit value. In addition, ha_random64() is
slow since shared between threads.

Let's use statistical_prng() which is designed for this purpose and
is much cheaper. No backport is needed, this is only in 3.4.

CHANGELOG

@@ -1,6 +1,86 @@
 ChangeLog :
 ===========
 
+2026/05/20 : 3.4-dev13
+    - BUG/MINOR: backend: correct parameter value validation in get_server_ph_post()
+    - BUG/MINOR: config/dns: properly fail on duplicate nameserver name detection
+    - BUG/MEDIUM: dns: fix long loops in additional records parse on name failure
+    - BUG/MEDIUM: resolvers: fix name compression pointer validation in resolv_read_name()
+    - BUG/MEDIUM: dns: fix memory leak of sockaddr in dns_session_init() error path
+    - CLEANUP: proxy: fix tiny mistakes in parse error messages
+    - CLEANUP: dns: fix misleading error messages in dns_stream_init()
+    - BUG/MINOR: server: better handling of OOM in srv_set_fqdn()
+    - BUG/MINOR: servers: use proper source of pool_conn_name in srv_settings_cpy()
+    - BUG/MEDIUM: server/cli: unlock server lock on failure in cli_parse_set_server
+    - BUG/MINOR: resolvers: fix dangling list pointer in resolvers_new() error paths
+    - BUG/MINOR: dns: fix dangling dgram pointer on dns_dgram_init() failure path
+    - BUG/MINOR: proxy: use proxy_drop() in parse_new_proxy() error path
+    - CLEANUP: resolvers: properly initialize the sample in resolv_action_do_resolve()
+    - BUG/MINOR: resolvers: report the expression error in the do-resolve() action parser
+    - BUG/MINOR: resolvers: fix leaked dgram and dns_ring struct in parse_resolve_conf()
+    - BUG/MINOR: resolvers: fix leaked fields on cfg_parse_resolvers() error paths
+    - BUG/MINOR: resolvers: fix missing task_idle destruction in resolvers_destroy()
+    - CLEANUP: proxy: fix duplicate declaration of cli_find_frontend in proxy.h
+    - CLEANUP: address a few typos and copy-paste errors in httpclient and dns
+    - DOC: internal: add a few rules about internal core principles
+    - BUG/MINOR: session/trace: use distinct flags for SESS_EV_END and _ERR
+    - CLEANUP: stick-table: uniformize the different action_inc_gpc*()
+    - REGTESTS: do not run quic/tls13_ssl_crt-list_filters in quic openssl compat mode
+    - REGTESTS: quic/issuers_chain_path: do not forget to enable QUIC compat mode
+    - BUG/MINOR: sock: store the connection error status
+    - BUG/MINOR: check: properly report errno in chk_report_conn_err()
+    - CLEANUP: tcpcheck: mention that we're a bit far for a sync errno
+    - BUG/MINOR: jwt: fix possible memory leak in convert_ecdsa_sig() error path
+    - CLEANUP: jwe: fix theoretical overflow in AAD length calculation
+    - DOC: config: further clarify that resolvers "default" exists
+    - MINOR: proxy: remove the experimental status on dynamic backends
+    - BUG/MEDIUM: limits: properly account for global.maxpipes in compute_ideal_maxconn()
+    - BUG/MINOR: jws: fix OpenSSL 3.0 version check from > to >=
+    - BUG/MINOR: jws: Add missing return value check (EVP_PKEY_get_bn_param)
+    - BUG/MINOR: server: Properly handle init-state value during haproxy startup
+    - BUG/MINOR: httpclient-cli: Destroy http-client context if failing to start it
+    - BUG/MEDIUM: h1: Skip all h2c values from Upgrade headers during parsing
+    - BUG/MINOR: h1: Don't mask websocket protocol if multiple protocols used
+    - MINOR: haterm: Don't init haterm master pipe if not used
+    - CLEANUP: haterm: Remove "(too old kernel)" from warning message during init
+    - BUG/MINOR: httpclient-cli: fix uninit variable in error label
+    - MINOR: mux: Rename the "token" from mux_proto_list to mux_proto
+    - MEDIUM: connections: Use both mux_proto and alpn to pick a mux
+    - MINOR: connection: define conn_select_mux_fe()
+    - MINOR: connection: define conn_select_mux_be()
+    - MINOR: connection/mux_quic: add MUX <init_xprt> field for QMux handshake
+    - MINOR: proxy/server: reject TCP ALPN h3 without experimental
+    - MEDIUM: ssl: allow h3/QMux negotiation without explicit proto
+    - BUG/MINOR: server: accept server IDs above 2^31 and clarify error message
+    - BUG/MINOR: backend: fix balance hash calculation when using hash-type none
+    - MINOR: server: support hash-key id32 for a cleaner distribution
+    - MINOR: backend: support hash-key guid for a stabler distribution
+    - MINOR: startup: support unprivileged chroot if possible
+    - MEDIUM: startup: add automatic chroot feature
+    - MINOR: h2: explain committed_extra_streams dec on h2_init() error
+    - OPTIM: h2: do not update committed streams if elasticity disabled
+    - MINOR: mux_quic: implement basic committed_extra_streams accounting
+    - MINOR: quic: use stream elasticity value for initial advertisement
+    - MINOR: mux_quic: define ms_bidi_rel QCC member
+    - MAJOR: mux_quic: support stream elasticity during connection lifetime
+    - BUG/MEDIUM: servers: Store the connection hash with the parameter cache
+    - BUG/MINOR: prevent conn leak in case of xprt_qmux init failure
+    - BUILD: traces: set a few __maybe_unused on vars used only for traces
+    - BUILD: traces: add USE_TRACE allowing to disable traces
+    - MINOR: startup: do not execute chroot() when "/"
+    - MEDIUM: startup: warn when chroot is not set for root
+    - BUG/MEDIUM: servers: Don't forget to set srv_hash when needed
+    - DOC: fix typo on QUIC stream.max-concurrent reference
+    - BUG/MINOR: mux_quic: do not exceed stream.max-concurrent on backend side
+    - BUG/MINOR: htx: Fix value of HTX_XFER_HDRS_ONLY flag
+    - MEDIUM: htx: Improve htx_xfer API to not count HTX meta-data
+    - BUG/MEDIUM: applet: Fix transfer of HTX data to the applet
+    - BUG/MEDIUM: htx: Alloc a chunk of right size in htx_replace_blk_value()
+    - MEDIUM: stick-tables: Avoid freeing elements while holding a lock
+    - MINOR: intops: add a multiply overflow detection for ulong and size_t
+    - CLEANUP: tree-wide: use array_size_or_fail() in array size for allocations
+    - DOC: update supported gcc and openssl versions in INSTALL
+
 2026/05/13 : 3.4-dev12
     - SCRIPTS: announce-release: add a link to the OpenTelemetry filter
     - BUG/MEDIUM: servers: Only requeue servers if they are up

INSTALL

@@ -111,12 +111,12 @@ HAProxy requires a working GCC or Clang toolchain and GNU make :
     may want to retry with "gmake" which is the name commonly used for GNU make
     on BSD systems.
 
-  - GCC >= 4.7 (up to 15 tested). Older versions are no longer supported due to
+  - GCC >= 4.7 (up to 16 tested). Older versions are no longer supported due to
     the latest mt_list update which only uses c11-like atomics. Newer versions
     may sometimes break due to compiler regressions or behaviour changes. The
     version shipped with your operating system is very likely to work with no
     trouble. Clang >= 3.0 is also known to work as an alternative solution, and
-    versions up to 19 were successfully tested. Recent versions may emit a bit
+    versions up to 21 were successfully tested. Recent versions may emit a bit
     more warnings that are worth reporting as they may reveal real bugs. TCC
     (https://repo.or.cz/tinycc.git) is also usable for developers but will not
     support threading and was found at least once to produce bad code in some
@@ -237,7 +237,7 @@ to forcefully enable it using "USE_LIBCRYPT=1".
 -----------------
 For SSL/TLS, it is necessary to use a cryptography library. HAProxy currently
 supports the OpenSSL library, and is known to build and work with branches
-1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, and 3.0 to 3.6. It is recommended to use
+1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, and 3.0 to 4.0. It is recommended to use
 at least OpenSSL 1.1.1 to have support for all SSL keywords and configuration
 in HAProxy. OpenSSL follows a long-term support cycle similar to HAProxy's,
 and each of the branches above receives its own fixes, without forcing you to

Makefile

@@ -44,6 +44,7 @@
 #   USE_CLOSEFROM           : enable use of closefrom() on *bsd, solaris. Automatic.
 #   USE_PRCTL               : enable use of prctl(). Automatic.
 #   USE_PROCCTL             : enable use of procctl(). Automatic.
+#   USE_TRACE               : enable trace subsystem. Always on.
 #   USE_ZLIB                : enable zlib library support and disable SLZ
 #   USE_SLZ                 : enable slz library instead of zlib (default=enabled)
 #   USE_CPU_AFFINITY        : enable pinning processes to CPU on Linux. Automatic.
@@ -343,7 +344,7 @@ use_opts = USE_EPOLL USE_KQUEUE USE_NETFILTER USE_POLL                        \
            USE_TPROXY USE_LINUX_TPROXY USE_LINUX_CAP                          \
            USE_LINUX_SPLICE USE_LIBCRYPT USE_CRYPT_H USE_ENGINE               \
            USE_GETADDRINFO USE_OPENSSL USE_OPENSSL_WOLFSSL USE_OPENSSL_AWSLC  \
-	       USE_ECH                                                            \
+           USE_ECH USE_TRACE                                                  \
            USE_SSL USE_LUA USE_ACCEPT4 USE_CLOSEFROM USE_ZLIB USE_SLZ         \
            USE_CPU_AFFINITY USE_TFO USE_NS USE_DL USE_RT USE_LIBATOMIC        \
            USE_MATH USE_DEVICEATLAS USE_51DEGREES                             \
@@ -366,6 +367,9 @@ $(warn_unknown_options)
 # on the make command line.
 USE_POLL   = default
 
+# traces are always enabled
+USE_TRACE  = default
+
 # SLZ is always supported unless explicitly disabled by passing USE_SLZ=""
 # or disabled by enabling ZLIB using USE_ZLIB=1
 ifeq ($(USE_ZLIB:0=),)

VERDATE

@@ -1,2 +1,2 @@
 $Format:%ci$
-2026/05/13
+2026/05/20

VERSION

@@ -1 +1 @@
-3.4-dev12
+3.4-dev13

doc/configuration.txt

@@ -3,7 +3,7 @@
                           Configuration Manual
                          ----------------------
                               version 3.4
-                              2026/05/13
+                              2026/05/20
 
 
 This document covers the configuration language as implemented in the version
@@ -2126,13 +2126,28 @@ ca-base <dir>
   directives. Absolute locations specified in "ca-file", "ca-verify-file" and
   "crl-file" prevail and ignore "ca-base".
 
-chroot <jail dir>
+chroot { <jail dir> | auto }
   Changes current directory to <jail dir> and performs a chroot() there before
   dropping privileges. This increases the security level in case an unknown
   vulnerability would be exploited, since it would make it very hard for the
-  attacker to exploit the system. This only works when the process is started
+  attacker to exploit the system. It is important to ensure that <jail dir>
-  with superuser privileges. It is important to ensure that <jail_dir> is both
+  is both empty and non-writable to anyone. When the process is started with
-  empty and non-writable to anyone.
+  superuser privileges, the chroot() is performed directly. On Linux, when
+  started unprivileged, haproxy attempts to perform it from inside a new
+  user namespace created with unshare(CLONE_NEWUSER); if that mechanism is
+  unavailable the chroot() will fail with the usual error.
+
+  As a special case, <jail dir> may be set to "auto", in which case haproxy
+  creates an anonymous temporary directory, unlinks it, and chroots into it.
+  The resulting jail has no name in the filesystem and is empty and read-only,
+  removing the need to prepare a dedicated jail directory.
+
+  When starting with superuser privileges, a warning will be displayed if no
+  chroot is used, in order to encourage users to always use the mechanism. If
+  for any reason there is a compelling reason not to use chroot (e.g. access to
+  a server via a UNIX socket with an unconvenient path), it remains possible to
+  silence the warning by adding an explicit "chroot /", which has the benefit
+  of being visible in a configuration.
 
 close-spread-time <time>
   Define a time window during which idle connections and active connections
@@ -3314,7 +3329,7 @@ setenv <name> <value>
   the configuration file sees the new value. See also "presetenv", "resetenv",
   and "unsetenv".
 
-shm-stats-file <name> [ EXPERIMENTAL ]
+shm-stats-file <name>
   When this directive is set, it enables the use of shared memory for storing
   stats counters. <name> is used as argument to shm_open() to open the shared
   memory at a unique location. It also means that the directive is only
@@ -3330,7 +3345,7 @@ shm-stats-file <name> [ EXPERIMENTAL ]
 
   See also "guid", "guid-prefix" and "shm-stats-file-max-objects"
 
-shm-stats-file-max-objects <number> [ EXPERIMENTAL ]
+shm-stats-file-max-objects <number>
   This setting defines the maximum number of objects the shared memory used
   for shared counters will be able to store per thread group. It is directly
   related to the maximum memory size of the shm and is used to "premap" the
@@ -5306,17 +5321,26 @@ tune.quic.frontend.stream-data-ratio  <0..100, in percent> (deprecated)
 
 tune.quic.be.stream.max-concurrent <number>
 tune.quic.fe.stream.max-concurrent <number>
-  Sets the QUIC initial_max_streams_bidi transport parameter either on frontend
+  On frontend side, this is used as the value for the advertised
-  or backend side. This is the maximum number of bidirectional streams that the
+  initial_max_streams_bidi transport parameter. This is enforced as the maximum
-  remote peer will be authorized to open concurrently during the connection
+  number of bidirectional streams that the remote peer will be authorized to
-  lifetime. On frontend side, this limits the number of concurrent HTTP/3
+  open concurrently during the connection lifetime. This effectively limits the
-  client requests.
+  number of concurrent HTTP/3 client requests.
 
   The default value is 100. Note that if you reduces it, it can restrict the
   buffering capabilities of streams on receive, which would result in poor
   upload throughput. It can be corrected by increasing the QUIC stream rxbuf
   connection setting.
 
+  On backend side, this is enforced locally by haproxy to limit the number of
+  concurrent requests multiplexed over a single connection. This may be further
+  restricted by the peer flow control. It may be necessary to reduce the
+  default value of 100 to improve a site's responsiveness at the expense of a
+  higher number of opened backend connections. Similarly to the frontend side,
+  this setting also directly impacts the Rx buffering capability, this time
+  though limiting the HTTP download capacity. QUIC stream rxbuf setting can be
+  increased when dealing mostly with HTTP responses larger than "tune.bufsize".
+
   See also: "tune.quic.be.stream.rxbuf", "tune.quic.fe.stream.rxbuf",
             "tune.quic.be.stream.data-ratio", "tune.quic.fe.stream.data-ratio"
 
@@ -5719,6 +5743,16 @@ tune.streams-elasticity <number>
   use lower values (120 to 200) to support 1.2 to 2 streams per connection on
   average at full load.
 
+  Contrary to HTTP/2, QUIC is capable to dynamically adjust the number of
+  concurrent streams during the connection lifetime. However, QUIC flow control
+  is stricter than HTTP/2, thus it is preferable when using it to specify
+  values big enough to prevent extra latency on the connection. There is also a
+  limitation for QUIC listeners with enabled 0-RTT. In this case, the initial
+  value advertised to the peer will ignore stream elasticity and instead rely
+  solely on the "tune.quic.fe.stream.max-concurrent" setting. However, the
+  stream elasticity principle will still be effective past this initial
+  annoucement during the connection lifetime.
+
   Monitoring the total number of active streams on backends, including queues,
   provides a practical indicator of a sustainable target load and helps avoid
   over-provisioning.
@@ -8260,7 +8294,10 @@ hash-type <method> <function> <modifier>
 
        none   don't hash the key, the key will be used as a hash, this can be
               useful to manually hash the key using a converter for that purpose
-              and let haproxy use the result directly.
+              and let haproxy use the result directly. The operation will
+              convert the key to a string if it is not already, and parse it as
+              an integer whose value will be used as the key. Some input key
+              types might not be relevant here (e.g. IP addresses).
 
     <modifier> indicates an optional method applied after hashing the key :
 
@@ -18847,6 +18884,21 @@ hash-key <key>
                  better only use values comprised between 1 and this value to
                  avoid overlap.
 
+      id32       The node keys will be derived from the server's numeric
+                 identifier as set from "id" or which defaults to its position
+                 in the server list, but the full 32 bits of the ID will be
+                 used so that there is no collision. This one is not scaled
+                 like "id" is, so it is recommended to either always use it
+                 with a hash function (see "hash-key") or with explicitly
+                 assigned ID values that are evenly distributed over the 32-bit
+                 space.
+
+      guid       The node keys will be derived from the server's guid, when
+                 available, otherwise they will fall back on "id". The benefit
+                 is that it does not depend on ordering at all, only on an
+                 internal stable identifier that can be replicated across many
+                 load balancers.
+
       addr       The node keys will be derived from the server's address, when
                  available, or else fall back on "id".
 
@@ -18876,9 +18928,13 @@ healthcheck <name>
 id <value>
   May be used in the following contexts: tcp, http, log
 
-  Set a persistent ID for the server. This ID must be positive and unique for
+  Set a persistent ID for the server. This ID must be a 32-bit positive number
-  the proxy. An unused ID will automatically be assigned if unset. The first
+  and unique for the proxy. An unused ID will automatically be assigned if
-  assigned value will be 1. This ID is currently only returned in statistics.
+  unset. The first assigned value will be 1. This ID is currently only returned
+  in statistics, and is used to place LB nodes when using consistent hash
+  algorithms when "hash-key" is set to "id" (the default). In this case, only
+  the 28 lowest bits of the value are used (i.e. (id % 268435356)), so better
+  only use values comprised between 1 and this value to avoid overlap.
 
 idle-ping <delay>
   May be used in the following contexts: tcp, http, log
@@ -18972,7 +19028,7 @@ downinter <delay>
   "inter" setting will have a very limited effect as it will not be able to
   reduce the time spent in the queue.
 
-init-state { fully-up | up | down | fully-down }
+init-state { fully-up | up | down | fully-down | none }
   May be used in the following contexts: tcp, http
 
   May be used in sections :   defaults | frontend | listen | backend
@@ -18980,20 +19036,25 @@ init-state { fully-up | up | down | fully-down }
 
   The "init-state" option sets the initial state of the server:
     - when set to 'fully-up', the server is considered immediately available
-      and can turn to the DOWN state when ALL health checks fail.
+      and, if health checks are enabled for this server, it will be turned to
-    - when set to 'up' (the default), the server is considered immediately
+      the DOWN state when ALL health checks fail.
-      available and will initiate a health check that can turn it to the DOWN
+    - when set to 'up', the server is considered immediately available and, if
-      state immediately if it fails.
+      health checks are enabled for this server, it will be turned to the DOWN
-    - when set to 'down', the server initially is considered unavailable and
+      state immediately if the next health check fails.
-      will initiate a health check that can turn it to the UP state immediately
+    - when set to 'down', the server initially is considered unavailable and,
-      if it succeeds.
+      if health checks are enabled for this server, it can be turned to the UP
+      state if the next health check succeeds.
     - when set to 'fully-down', the server is initially considered unavailable
-      and can turn to the UP state when ALL health checks succeed.
+      and, if health checks are enabled for this server, it will turned to the
+      UP state when ALL health checks succeed.
+    - when set to 'none' (the default value), init-state management is
+      disabled. It can be used to restore the default behavior when this
+      parameter was inherited from a 'default-server' directive.
 
   The server's init-state is considered when the HAProxy instance is
   (re)started, a new server is detected (for example via service discovery /
   DNS resolution), a dynamic server is inlived, a server exits maintenance,
-  etc.
+  etc. This directive cannot be used when the server is tracking another one.
 
   Examples:
       # pass client traffic ONLY to Redis "master" node
@@ -20189,7 +20250,11 @@ a cache of previous answers, an answer will be considered obsolete after
 
 
 resolvers <resolvers id>
-  Creates a new name server list labeled <resolvers id>
+  Creates a new name server list labeled <resolvers id>. As mentioned above,
+  the special name "default" always exists and will be automatically created if
+  not explicitly declared; this will be the one internal services such as
+  httpclient rely on. Declaring a "default" entry will affect how such services
+  perform their name resolution.
 
 A resolvers section accept the following parameters:
 

doc/internals/core-principles.txt

@@ -0,0 +1,229 @@
+HAPROXY CORE PRINCIPLES
+
+0. RULE ZERO: EXCEPTIONS AND JUSTIFICATION
+   - These rules are mandatory; violations are bugs unless explicitly justified.
+   - A violation is acceptable if accompanied by a comment explaining WHY the
+     standard approach was insufficient (e.g., "Performance-critical bypass").
+   - Reviews should flag unjustified violations but accept commented ones.
+
+1. PROJECT ORGANIZATION
+   - header files all under "include/", and split between haproxy/<file>-t.h for
+     type definitions (types, enums, structures), and haproxy/<file>.h for static
+     definitions and exported symbols. A few imported libs under include/import.
+   - C source files in src/.
+   - some API doc in doc/internals/api/ (not always up to date, check date or
+     version at the top).
+
+2. ENVIRONMENT AND DATA TYPES
+   - The project targets 32/64-bit POSIX systems (little or big endian).
+   - Char is signed or unsigned 8-bit, short signed 16-bit, int signed 32-bit.
+   - Long and pointers always match the native word size. Long long is 64-bit.
+   - Aliases: uchar (unsigned char), uint (unsigned int), ulong (unsigned long),
+     ushort (unsigned short), ullong (unsigned long long), llong (long long),
+     schar (signed char).
+   - size_t always same size as long but often declared as uint on 32-bit and
+     ulong on 64-bit. Do not use in printf() without a cast (ulong with "%lu").
+   - Main platforms are x86_64 and aarch64 with high thread counts (>=64).
+   - Unaligned accesses are permitted for archs that support them; portable
+     wrappers in net_helper.h (read_u32(), write_u32() etc).
+   - signed integer wrapping well-defined via -fwrapv.
+   - arch-specific asm() statements OK as long as equivalent C-code exists for
+     generic archs.
+   - Pointer arithmetics used a lot via container_of(), offset_of(), and void*
+     casts.
+   - Floating point not used.
+
+3. MEMORY MANAGEMENT AND POOLS
+   - Pools are used for runtime allocation; malloc/free are for boot code only.
+   - pool_alloc() semantics match malloc(); the return must always be tested.
+   - pool_alloc() and malloc() are not interchangeable / compatible.
+   - pool_free() semantics match free(); it is a no-op on NULL.
+   - pool_free() makes the pointer invalid immediately; it must not be touched
+     or passed to pool_free() again.
+   - Memory allocated from one pool must be released to the same pool.
+   - ha_free() calls free() and sets the pointer to NULL before returning.
+   - my_realloc2() frees the original pointer if the allocation fails.
+   - never leave dangling pointers in structs after free().
+
+4. BUFFER INVARIANTS (struct buffer)
+   - Buffers are 4-word inline structs used for data in transit (wrapping,
+     sliding window).
+   - Members: area (storage), size (capacity), head (offset), data (count).
+   - The area pointer is allowed to be NULL when size is zero.
+   - always true: 0<=data<=size; always true when size>0: 0<=head<size.
+   - contents start at <head>, for <data> bytes, and may wrap at the end of the
+     storage area (area+size).
+   - API (b_*, in buf.h and dynbuf.h) supports empty or unallocated buffers.
+   - idempotent functions b_alloc() and b_free() use pools to manage the
+     storage area and check <size> to know if alloc/free still needed.
+   - a non-contiguous version exists (ncbuf, ncbmbuf), allowing holes anywhere
+     in data. The former mandates holes of at least 8 bytes. The second relies
+     on a bitmap of populated places.
+   - another string API exists, "ist", representing a pointer and a length in a
+     struct that is returned by inline functions and macros. It is described in
+     doc/internals/api/ist.txt
+   - buffers can switch to and from HTX, which is an internal representation of
+     HTTP elements, with an API supporting header addition/modification/removal,
+     start-line manipulation, data appending/consumption etc. HTX functions are
+     all prefixed with "htx_". Between htx_from_buf() and htx_to_buf(), only the
+     HTX API may be used, not the b_* API.
+
+5. DATA MANIPULATION (CHUNKS, TRASH, LISTS, TREES)
+   - Chunks use the buffer API but are NOT allowed to wrap.
+   - Chunks are used for linear operations like chunk_printf().
+   - Trash is a thread-local temporary buffer; scope stays within the caller.
+   - trash always the same size as a buffer (global.tune.bufsize).
+   - get_trash_chunk() provides up to 3 rotating thread-local trash chunks (with
+     a scope spanning from the call to the next function call).
+   - For longer lived trash chunks, alloc_trash_chunk() is available but must be
+     released using free_trash_chunk() on leaving.
+   - standard doubly-linked lists (struct list) are provided via macros LIST_*.
+   - LIST_INIT() must be used on new heads and elements. LIST_DELETE() only
+     removes the element and does not reinitialize it, so the idempotent
+     LIST_DEL_INIT() is generally preferred. Iterators like list_for_each_* are
+     available, some safe against item removal. See doc/internals/api/list.txt
+     for details (grep -i "^list_" to list available macros).
+   - thread-safe doubly-linked lists (struct mt_list) are provided via macros
+     mt_list_*. They work like lists and use compatible storage, though they may
+     not be mixed. See doc/internals/api/mt_list.txt (grep -i "^mt_list_" to
+     list available operations).
+   - elastic binary trees (ebtree) are used for fast access (O(logN) operations,
+     O(1) deletion). Idempotent deletion. Main functions are lookup, insert,
+     delete, first, next, with type-based prefix eb{32,64,st,mb,pt}_*().
+   - compact elastic binary trees (cebtree) are used for read-mostly focusing on
+     space savings (O(logN) operations, but higher cost than ebtree). Same ops
+     as ebtree, with type-based prefix ceb{32,u32,64,u64,s,is}_*.
+
+6. THREAD SYNCHRONIZATION
+   - Threads are started at boot (one per CPU) and persist for the process life,
+     arranged in thread groups (tg) by cache locality.
+   - Each thread has its own polling loop and scheduler. Total parallelism.
+   - thread_isolate()/thread_release() for total thread isolation (very heavy).
+   - "tid" always current thread number, "th_ctx" always current thread's context,
+     "ti" current thread info.
+   - "tgid" always current tg number, "tg_ctx" current tg context.
+   - HA_ATOMIC_* for atomic operations on integers and pointers (includes load
+     and store). DWCAS available on some platforms but requires an equivalent
+     for other ones.
+   - The _HA_ATOMIC_* version (leading underscore) do not use barriers so these
+     must be explicit (__ha_barrier_*).
+   - Atomic loops must use CPU relaxation or exponential back-off.
+   - For multiple changes at once, threads may use spinlocks (HA_SPIN_LOCK()/
+     HA_SPIN_UNLOCK/HA_SPIN_TRYLOCK), and upgradable RW locks (HA_RWLOCK_*) if
+     read accesses dominate.
+   - No sleeping locks (mutex etc), only spinning/rwlocks/atomic loops.
+
+7. SCHEDULING AND LATENCY
+   - Latency is critical.
+   - No runtime filesystem access, no blocking calls, no long loops.
+   - Complex processing must be split into small steps; the task must yield.
+   - CPUs are not dedicated to haproxy, high risk of a thread being interrupted
+     by another process if it works too long, catastrophic if it happens with a
+     lock held.
+   - A watchdog kills the process if a task hogs a CPU for > few milliseconds.
+   - Tasks vs Tasklets: Tasks have tree storage (rq) and timers (wq); tasklets
+     use list elements instead of rq and are smaller (no wq). Only task.c/h may
+     distinguish rq vs list access.
+   - Tasks are aliased to tasklet while they are running (hence why some
+     functions cast task to tasklets and conversely to access certain fields).
+   - inter-thread task/tasklet wakeups always safe using the task_* API.
+   - task/tasklet->state field must always be accessed atomically.
+
+8. ARCHITECTURAL LAYERS (MUX AND STREAMS)
+   - Naming: Lower layer (multiplexed), attached to the connection uses suffix
+     'c' (h1c, h2c, qcc, muxc); Upper layer (demultiplexed/application, often a
+     stream) uses suffix 's' (h1s, h2s, qcs, muxs).
+   - Application layer stream (struct stream) has two stream connectors (stconn):
+     front (scf) and back (scb). Responsible for processing requests/responses,
+     deciding which server to route it, finding a backend connection or creating
+     one, and exchanging data between the two sides.
+   - Stream connectors link to a muxs or applet via a stream endpoint descriptor
+     (sedesc/sd), and exchange data via buffers, which for an HTTP muxs are HTX
+     buffers containing HTX blocks.
+   - The sd carries the shared context between layers.
+   - When a stream detaches from a mux, a new sd is allocated for the stream and
+     the mux keeps its previous sd: stconn and muxs both always have a valid sd.
+   - Front connections/streams are tied to the creator thread forever.
+   - Idle back connections can be stolen via mux->takeover(), but become
+     thread-bound once a stream attaches. => all streams of a mux are on the
+     same thread.
+   - session vs connection vs stream: connection is transport; session lasts for
+     the client connection's life; stream are request/response pairs.
+   - applets carry a context specific to the service being executed or the CLI
+     command in appctx->svcctx, and this one is always zeroed before the handler
+     is first called.
+
+9. FUNCTION RETURN CONVENTIONS
+   - Boolean style: Functions named as actions/sentences return 0 (failure) or
+     non-zero (success).
+   - Integer style: some syscall-like functions return <0 (error) or >=0 (success).
+   - Tri-state style, e.g. counts: <0 (error), 0 (no progress), >0 (success).
+
+10. DIAGNOSTICS AND SAFETY
+   - When DEBUG_STRICT is set, ABORT_NOW() crashes the program immediately, and
+     BUG_ON(cond[,msg]) crashes the program if the condition is true.
+   - COUNT_IF() / CHECK_IF() only track if a condition occurs (non-fatal).
+   - Glitches are counters for uncommon events used to detect hostile behavior.
+   - strcpy(), strcat() and sprintf() are totally forbidden (the program will
+     not build).
+
+11. BASIC CODING STYLE
+   - Linux Kernel-like, but uses tabs for indent, spaces for alignment. Function
+     definitions have their opening brace on a new line, never on the same line.
+   - All local variables must be declared at the beginning of the function
+     block, before any executable statements (gnu89-like).
+   - Avoid variable shadowing in code blocks.
+   - Beware of local static and global variables.
+   - Use const arguments whenever possible.
+   - Avoid static storage when persistence is not needed.
+   - Macros in uppercase unless they're used to wrap functions which then get a
+     leading underscore.
+   - Explicitly compare functions returning non-zero with 0 (e.g. strcmp) unless
+     they explicitly return a boolean (e.g. isalnum) or a pointer (e.g. strchr).
+   - Unsigned int comparisons to zero never use >0 but !=0 to avoid signedness
+     mistakes.
+   - turn non-zero integer to boolean using "!" or "!!".
+
+12. BUILD AND TEST
+   - Preferred build command:
+     $ make -j$(nproc) TARGET=linux-glibc OPT_CFLAGS='-std=gnu89 -Os' \
+       USE_OPENSSL=1 USE_QUIC_OPENSSL_COMPAT=1 USE_QUIC=1 USE_LUA=1
+   - Individual files can be tested by passing src/file.o as a make argument.
+   - Compiler warnings are not permitted for new code.
+
+13. COMMIT MESSAGES AND DOCUMENTATION
+   - Commit messages must follow the project's strict format below. Do not try
+     to learn better from previous commits, which might be wrong during reviews.
+   - Structure: <TAG>: <location>: <subject> (max ~70 chars), then blank line,
+     then description.
+   - Tags:
+       - CLEANUP: spelling fixes, refactoring, no new code nor functional change.
+       - MINOR: new feature or low-impact change, may be backported if needed.
+       - MEDIUM: new feature or change with moderate severity/impact/risk.
+       - MAJOR: new feature or change with important severity/impact/risk.
+       - OPTIM: Performance improvements, may always be reverted if it breaks.
+       - DOC: Documentation updates or fixes.
+       - BUG/<severity>: Fixes a bug. Specify if regression or long-standing.
+         Valid severities are MINOR (low impact), MEDIUM (perf/stability risk
+         in uncommon configs, MAJOR (most configs), CRITICAL (stability risk
+         without workaround).
+       - Regressions: Find original commit via `git blame`; designate using
+         `git log -1 --format='%h ("%s")'` and version via `git describe --tags`.
+   - Location: subsystem (stream, tasks, mux-h2, qpack etc).
+   - Description: Explain technical "WHY", "HOW", and technical impact. Explain
+     how to trigger the bug for developer testing.
+   - Backports: only for fixes, mention versions ("Must be backported to 3.0").
+   - Style: No generic messages like "fix(xxx): blah". Be technically precise.
+   - Do not mix spelling fixes in comments (not important) with other changes.
+     However it's preferred to have a single commit for many typo fixes at once.
+   - Spelling mistakes in user-visible parts (doc, logs, traces, error messages)
+     must be in their own commit (may need backport).
+   - One commit per bug.
+   - Example:
+       BUG/MEDIUM: sample: fix null pointer dereference in h1_parse_line
+
+       When parsing malformed headers, the line buffer was not initialized.
+       This caused a crash on certain edge cases. Let's fix this by always
+       initializing the line buffer when first calling the parser. This was
+       brought by commit 04c9e8f5 ("MINOR: add h1_parse_line") in latest -dev
+       so no backport is needed.

include/haproxy/connection-t.h

@@ -179,6 +179,8 @@ enum {
 	/* below we have all handshake flags grouped into one */
 	CO_FL_HANDSHAKE     = CO_FL_SEND_PROXY | CO_FL_ACCEPT_PROXY | CO_FL_ACCEPT_CIP | CO_FL_SOCKS4_SEND | CO_FL_SOCKS4_RECV,
 	CO_FL_WAIT_XPRT     = CO_FL_WAIT_L4_CONN | CO_FL_HANDSHAKE | CO_FL_WAIT_L6_CONN,
+	/* handshake running on top of a layer6 */
+	CO_FL_WAIT_XPRT_L6  = CO_FL_QMUX_SEND | CO_FL_QMUX_RECV,
 
 	CO_FL_SSL_WAIT_HS   = 0x08000000,  /* wait for an SSL handshake to complete */
 
@@ -673,11 +675,12 @@ struct connection {
 };
 
 struct mux_proto_list {
-	const struct ist token;    /* token name and length. Empty is catch-all */
+	const struct ist mux_proto;    /* Mux protocol, to be used with the "proto" directive */
 	enum proto_proxy_mode mode;
 	enum proto_proxy_side side;
 	const struct mux_ops *mux;
 	const char *alpn;          /* Default alpn to set by default when the mux protocol is forced (optional, in binary form) */
+	int init_xprt;
 	struct list list;
 };
 

include/haproxy/connection.h

@@ -86,7 +86,10 @@ int conn_create_mux(struct connection *conn, int *closed_connection);
 int conn_notify_mux(struct connection *conn, int old_flags, int forced_wake);
 int conn_upgrade_mux_fe(struct connection *conn, void *ctx, struct buffer *buf,
                         struct ist mux_proto, int mode);
+const struct mux_proto_list *conn_select_mux_fe(const struct connection *conn);
 int conn_install_mux_fe(struct connection *conn, void *ctx);
+
+const struct mux_proto_list *conn_select_mux_be(const struct connection *conn);
 int conn_install_mux_be(struct connection *conn, void *ctx, struct session *sess,
                         const struct mux_ops *force_mux_ops);
 int conn_install_mux_chk(struct connection *conn, void *ctx, struct session *sess);
@@ -111,6 +114,7 @@ int conn_reverse(struct connection *conn);
 const char *conn_err_code_name(struct connection *c);
 const char *conn_err_code_str(struct connection *c);
 int xprt_add_hs(struct connection *conn);
+int xprt_add_l6hs(struct connection *conn, int xprt);
 void register_mux_proto(struct mux_proto_list *list);
 
 static inline void conn_report_term_evt(struct connection *conn, enum term_event_loc loc, unsigned char type);
@@ -649,7 +653,7 @@ static inline struct mux_proto_list *get_mux_proto(const struct ist proto)
 	struct mux_proto_list *item;
 
 	list_for_each_entry(item, &mux_proto_list.list, list) {
-		if (isteq(proto, item->token))
+		if (isteq(proto, item->mux_proto))
 			return item;
 	}
 	return NULL;
@@ -668,6 +672,7 @@ void list_mux_proto(FILE *out);
  */
 static inline const struct mux_proto_list *conn_get_best_mux_entry(
         const struct ist mux_proto,
+        const struct ist alpn,
         int proto_side, int proto_is_quic, int proto_mode)
 {
 	struct mux_proto_list *item;
@@ -676,10 +681,14 @@ static inline const struct mux_proto_list *conn_get_best_mux_entry(
 	list_for_each_entry(item, &mux_proto_list.list, list) {
 		if (!(item->side & proto_side) || !(item->mode & proto_mode) || ((proto_is_quic != 0) != ((item->mux->flags & MX_FL_FRAMED) != 0)))
 			continue;
-		if (istlen(mux_proto) && isteq(mux_proto, item->token)) {
+		if (istlen(mux_proto) && isteq(mux_proto, item->mux_proto)) {
 			return item;
 		}
-		else if (!istlen(item->token)) {
+		else if (istlen(alpn) && item->alpn &&
+		    strlen(item->alpn) == istlen(alpn) + 1 &&
+		    !memcmp(alpn.ptr, item->alpn + 1, istlen(alpn)))
+			return item;
+		else if (!istlen(item->mux_proto)) {
 			if (!fallback || (item->mode == proto_mode && fallback->mode != proto_mode))
 				fallback = item;
 		}
@@ -696,11 +705,12 @@ static inline const struct mux_proto_list *conn_get_best_mux_entry(
  */
 static inline const struct mux_ops *conn_get_best_mux(struct connection *conn,
 						      const struct ist mux_proto,
+						      const struct ist alpn,
 						      int proto_side, int proto_mode)
 {
 	const struct mux_proto_list *item;
 
-	item = conn_get_best_mux_entry(mux_proto, proto_side, proto_is_quic(conn->ctrl), proto_mode);
+	item = conn_get_best_mux_entry(mux_proto, alpn, proto_side, proto_is_quic(conn->ctrl), proto_mode);
 
 	return item ? item->mux : NULL;
 }

include/haproxy/h1.h

@@ -98,7 +98,7 @@ enum h1m_state {
 #define H1_MF_UPG_WEBSOCKET     0x00008000 // Set for a Websocket upgrade handshake
 #define H1_MF_TE_CHUNKED        0x00010000 // T-E "chunked"
 #define H1_MF_TE_OTHER          0x00020000 // T-E other than supported ones found (only "chunked" is supported for now)
-#define H1_MF_UPG_H2C           0x00040000 // "h2c" or "h2" used as upgrade token
+/* unused: 0x00040000 */
 #define H1_MF_NOT_HTTP           0x00080000 // Not an HTTP message (e.g "RTSP", only possible if invalid message are accepted)
 /* Mask to use to reset H1M flags when we restart headers parsing.
  *
@@ -160,7 +160,7 @@ int h1_headers_to_hdr_list(char *start, const char *stop,
 
 int h1_parse_xfer_enc_header(struct h1m *h1m, struct ist value);
 void h1_parse_connection_header(struct h1m *h1m, struct ist *value);
-void h1_parse_upgrade_header(struct h1m *h1m, struct ist value);
+void h1_parse_upgrade_header(struct h1m *h1m, struct ist *value);
 
 void h1_generate_random_ws_input_key(char key_out[25]);
 void h1_calculate_ws_output_key(const char *key, char *result);

include/haproxy/http_client-t.h

@@ -17,7 +17,7 @@ struct httpclient {
 		struct buffer buf;             /* input buffer, raw HTTP */
 	} res;
 	struct {
-               /* callbacks used to send the request, */
+		/* callbacks used to send the request, */
 		void (*req_payload)(struct httpclient *hc);          /* send a payload */
 
 		/* callbacks used to receive the response, if not set, the IO
@@ -28,7 +28,7 @@ struct httpclient {
 		void (*res_end)(struct httpclient *hc);             /* end of the response */
 	} ops;
 	struct sockaddr_storage *dst;         /* destination address */
-	struct appctx *appctx;                /* HTTPclient appctx */
+	struct appctx *appctx;                /* HTTP client appctx */
 	int timeout_server;                   /* server timeout in ms */
 	void *caller;                         /* ptr of the caller */
 	unsigned int flags;                   /* other flags */
@@ -50,7 +50,7 @@ struct httpclient {
 #define    HTTPCLIENT_FS_ENDED        0x00020000 /* the httpclient is stopped */
 
 /* options */
-#define    HTTPCLIENT_O_HTTPPROXY     0x00000001 /* the request must be use an absolute URI */
+#define    HTTPCLIENT_O_HTTPPROXY     0x00000001 /* the request must use an absolute URI */
 #define    HTTPCLIENT_O_RES_HTX      0x00000002 /* response is stored in HTX */
 
 /* States of the HTTP Client Appctx */
@@ -65,4 +65,4 @@ enum {
 
 #define HTTPCLIENT_USERAGENT "HAProxy"
 
-#endif /* ! _HAPROXY_HTTCLIENT__T_H */
+#endif /* !_HAPROXY_HTTPCLIENT_T_H */

include/haproxy/http_client.h

@@ -38,4 +38,4 @@ static inline int httpclient_started(struct httpclient *hc)
 	return !!(hc->flags & HTTPCLIENT_FS_STARTED);
 }
 
-#endif /* ! _HAPROXY_HTTCLIENT_H */
+#endif /* !_HAPROXY_HTTPCLIENT_H */

include/haproxy/htx.h

@@ -65,7 +65,9 @@ struct buffer *htx_copy_to_large_buffer(struct buffer *dst, struct buffer *src);
 #define HTX_XFER_DEFAULT           0x00000000 /* Default XFER: no partial xfer / remove blocks from source */
 #define HTX_XFER_KEEP_SRC_BLKS     0x00000001 /* Don't remove xfer blocks from source messages during xfer */
 #define HTX_XFER_PARTIAL_HDRS_COPY 0x00000002 /* Allow partial copy of headers and trailers part */
-#define HTX_XFER_HDRS_ONLY         0x00000003 /* Only Transfer header blocks (start-line, header and EOH) */
+#define HTX_XFER_HDRS_ONLY         0x00000004 /* Only Transfer header blocks (start-line, header and EOH) */
+#define HTX_XFER_NO_METADATA       0x00000008 /* <count> don't include meta-data, only payload */
+
 size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int flags);
 
 /* Functions and macros to get parts of the start-line or length of these

include/haproxy/intops.h

@@ -76,6 +76,56 @@ static inline unsigned int div64_32(unsigned long long o1, unsigned int o2)
 	return result;
 }
 
+/* returns non-zero if a*b would overflow an unsigned long, otherwise sets the
+ * result into res and returns 0.
+ */
+static inline int mulul_overflow(unsigned long a, unsigned long b, unsigned long *res)
+{
+	/* __builtin_mul_overflow() is gcc >= 5 or clang >= 3.4 */
+#if (defined(__GNUC__) && __GNUC__ >= 5) || \
+    (defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 4)))
+	return __builtin_mul_overflow(a, b, res);
+#else
+	/* portable method involving a division */
+	if (a && b && a > (~(ulong)0) / b)
+		return 1;
+	*res = a * b;
+	return 0;
+#endif
+}
+
+/* returns non-zero if a*b would overflow a size_t, otherwise sets the
+ * result into res and returns 0.
+ */
+static inline int mulsz_overflow(size_t a, size_t b, size_t *res)
+{
+	/* __builtin_mul_overflow() is gcc >= 5 or clang >= 3.4 */
+#if (defined(__GNUC__) && __GNUC__ >= 5) || \
+    (defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 4)))
+	return __builtin_mul_overflow(a, b, res);
+#else
+	/* portable method involving a division */
+	if (a && b && a > (~(size_t)0) / b)
+		return 1;
+	*res = a * b;
+	return 0;
+#endif
+}
+
+/* Computes the size of an array of m*n bytes, taking overflows into account.
+ * If the multiply would overflow, returns the largest possible size_t so that
+ * any call to malloc() or equivalent would fail. Otherwise returns the size.
+ * Note that this implies that even 1*max would not be permitted either.
+ */
+static inline size_t array_size_or_fail(size_t m, size_t n)
+{
+	size_t size;
+
+	if (unlikely(mulsz_overflow(m, n, &size)))
+		return DISGUISE(~(size_t)0);
+	return size;
+}
+
 /* rotate left a 64-bit integer by <bits:[0-5]> bits */
 static inline uint64_t rotl64(uint64_t v, uint8_t bits)
 {

include/haproxy/mux_quic-t.h

@@ -53,6 +53,7 @@ struct qcc {
 		struct list frms; /* prepared frames related to flow-control  */
 
 		uint64_t ms_bidi_init; /* max initial sub-ID of bidi stream allowed for the peer */
+		uint64_t ms_bidi_rel; /* max relative sub-ID of bidi stream allowed for the peer */
 		uint64_t ms_bidi; /* max sub-ID of bidi stream allowed for the peer */
 		uint64_t cl_bidi_r; /* total count of closed remote bidi stream since last MAX_STREAMS emission */
 

include/haproxy/mux_quic.h

@@ -10,6 +10,7 @@
 #include <haproxy/connection.h>
 #include <haproxy/list.h>
 #include <haproxy/mux_quic-t.h>
+#include <haproxy/quic_tune.h>
 #include <haproxy/stconn.h>
 
 #include <haproxy/h3.h>
@@ -128,6 +129,9 @@ static inline void qcs_wait_http_req(struct qcs *qcs)
 	BUG_ON_HOT(qcs->flags & QC_SF_HREQ_RECV);
 	qcs->flags |= QC_SF_HREQ_RECV;
 	++qcc->nb_hreq;
+
+	/* On BE side avail_streams cb should prevent opening of too many concurrent streams. */
+	BUG_ON(conn_is_back(qcc->conn) && qcc->nb_hreq > quic_tune.be.stream_max_concurrent);
 }
 
 void qcc_show_quic(struct qcc *qcc);

include/haproxy/proxy.h

@@ -96,7 +96,7 @@ void proxy_capture_error(struct proxy *proxy, int is_back,
 			 void (*show)(struct buffer *, const struct error_snapshot *));
 void proxy_adjust_all_maxconn(void);
 struct proxy *cli_find_frontend(struct appctx *appctx, const char *arg);
-struct proxy *cli_find_frontend(struct appctx *appctx, const char *arg);
+struct proxy *cli_find_backend(struct appctx *appctx, const char *arg);
 int resolve_stick_rule(struct proxy *curproxy, struct sticking_rule *mrule);
 void free_stick_rules(struct list *rules);
 void free_server_rules(struct list *srules);

include/haproxy/resolvers-t.h

@@ -1,5 +1,5 @@
 /*
- * include/haproxy/dns-t.h
+ * include/haproxy/resolvers-t.h
  * This file provides structures and types for DNS.
  *
  * Copyright (C) 2014 Baptiste Assmann <bedis9@gmail.com>
@@ -114,7 +114,7 @@ struct resolv_answer_item {
 	char            name[DNS_MAX_NAME_SIZE+1];   /* answer name */
 	int16_t         type;                        /* question type */
 	int16_t         class;                       /* query class */
-	int32_t         ttl;                         /* response TTL */
+	uint32_t        ttl;                         /* response TTL */
 	int16_t         priority;                    /* SRV type priority */
 	uint16_t        weight;                      /* SRV type weight */
 	uint16_t        port;                        /* SRV type port */
@@ -281,7 +281,7 @@ enum {
 	                            * matching preference was found.
 	                            */
 	RSLV_UPD_SRVIP_NOT_FOUND,  /* provided IP not found
-	                            * OR provided IP found and preference is not match and an IP
+	                            * OR provided IP found and preference is not matched and an IP
 	                            * matching preference was found.
 	                            */
 	RSLV_UPD_NO_IP_FOUND,      /* no IP could be found in the response */

include/haproxy/resolvers.h

@@ -1,5 +1,5 @@
 /*
- * include/haproxy/dns.h
+ * include/haproxy/resolvers.h
  * This file provides functions related to DNS protocol
  *
  * Copyright (C) 2014 Baptiste Assmann <bedis9@gmail.com>

include/haproxy/server-t.h

@@ -111,7 +111,8 @@ enum srv_initaddr {
  * at start up time.
  */
 enum srv_init_state {
-	SRV_INIT_STATE_FULLY_DOWN = 0,     /* the server should initially be considered DOWN until it passes all health checks. Please keep set to zero. */
+	SRV_INIT_STATE_NONE = 0,
+	SRV_INIT_STATE_FULLY_DOWN,         /* the server should initially be considered DOWN until it passes all health checks. Please keep set to zero. */
 	SRV_INIT_STATE_DOWN,               /* the server should initially be considered DOWN until it passes one health check. */
 	SRV_INIT_STATE_UP,                 /* the server should initially be considered UP, but will go DOWN if it fails one health check. */
 	SRV_INIT_STATE_FULLY_UP,           /* the server should initially be considered UP, but will go DOWN if it fails all health checks. */
@@ -248,7 +249,9 @@ struct pid_list {
 
 /* srv methods of computing chash keys */
 enum srv_hash_key {
-	SRV_HASH_KEY_ID = 0,         /* derived from server puid */
+	SRV_HASH_KEY_ID = 0,         /* derived from server puid, 28 LSB used */
+	SRV_HASH_KEY_ID32,           /* derived from server puid, 32 bits used */
+	SRV_HASH_KEY_GUID,           /* derived from server guid */
 	SRV_HASH_KEY_ADDR,           /* derived from server address */
 	SRV_HASH_KEY_ADDR_PORT       /* derived from server address and port */
 };
@@ -326,6 +329,7 @@ enum renegotiate_mode {
 struct path_parameters {
 	__decl_thread(HA_RWLOCK_T param_lock);
 	char nego_alpn[MAX_ALPN_SIZE];
+	int64_t srv_hash;
 #ifdef USE_QUIC
 	struct quic_early_transport_params tps;
 #endif

include/haproxy/server.h

@@ -278,6 +278,35 @@ static inline void srv_adm_set_ready(struct server *s)
 	srv_clr_admin_flag(s, SRV_ADMF_FMAINT);
 }
 
+static inline void srv_set_init_state(struct server *srv)
+{
+	/* no init-state configured or the server is already disabled: don't eval init-state */
+	if (srv->init_state == SRV_INIT_STATE_NONE ||
+	    srv->next_admin & (SRV_ADMF_CMAINT | SRV_ADMF_FMAINT))
+		return;
+
+	if (srv->init_state == SRV_INIT_STATE_FULLY_UP) {
+		/* initially UP, when all checks fail to bring server DOWN */
+               srv->next_state = SRV_ST_RUNNING;
+               srv->check.health = srv->check.rise + srv->check.fall - 1;
+       }
+       else if (srv->init_state == SRV_INIT_STATE_UP) {
+	        /* initially UP, when one check fails check brings server DOWN */
+               srv->next_state = SRV_ST_RUNNING;
+               srv->check.health = srv->check.rise;
+       }
+       else if (srv->init_state == SRV_INIT_STATE_DOWN) {
+	       /* initially DOWN, when one check is successful bring server UP */
+               srv->next_state = SRV_ST_STOPPED;
+               srv->check.health = srv->check.rise - 1;
+       }
+       else if (srv->init_state == SRV_INIT_STATE_FULLY_DOWN) {
+	       /* initially DOWN, when all checks are successful bring server UP */
+               srv->next_state = SRV_ST_STOPPED;
+               srv->check.health = 0;
+       }
+}
+
 /* appends an initaddr method to the existing list. Returns 0 on failure. */
 static inline int srv_append_initaddr(unsigned int *list, enum srv_initaddr addr)
 {

include/haproxy/ssl_ocsp-t.h

@@ -50,7 +50,7 @@ struct certificate_ocsp {
 	int refcount_store;		/* Number of ckch_store that reference this certificate_ocsp */
 	int refcount;			/* Number of actual references to this certificate_ocsp (SSL_CTXs mostly) */
 	struct buffer response;
-	long expire;
+	unsigned long expire;
 	X509 *issuer;
 	STACK_OF(X509) *chain;
 	struct eb64_node next_update;	/* Key of items inserted in ocsp_update_tree (sorted by absolute date) */

include/haproxy/trace.h

@@ -34,6 +34,8 @@
 #define _TRC_LOC(f,l) __TRC_LOC(f, ":", l)
 #define __TRC_LOC(f,c,l) f c #l
 
+#if defined(USE_TRACE)
+
 /* truncate a macro arg list to exactly 5 args and replace missing ones with NULL.
  * The first one (a0) is always ignored.
  */
@@ -139,8 +141,23 @@
 			       &trace_no_cb, ist2(_msg, _msg_len));		\
 		}								\
 	} while (0)
+#else
+#    define TRACE_ENABLED(level, mask, args...) 0
+#    define TRACE(msg, mask, args...)        do { /* do nothing */ } while(0)
+#    define TRACE_ERROR(msg, mask, args...)  do { /* do nothing */ } while(0)
+#    define TRACE_USER(msg, mask, args...)   do { /* do nothing */ } while(0)
+#    define TRACE_DATA(msg, mask, args...)   do { /* do nothing */ } while(0)
+#    define TRACE_PROTO(msg, mask, args...)  do { /* do nothing */ } while(0)
+#    define TRACE_STATE(msg, mask, args...)  do { /* do nothing */ } while(0)
+#    define TRACE_DEVEL(msg, mask, args...)  do { /* do nothing */ } while(0)
+#    define TRACE_ENTER(mask, args...)       do { /* do nothing */ } while(0)
+#    define TRACE_LEAVE(mask, args...)       do { /* do nothing */ } while(0)
+#    define TRACE_POINT(mask, args...)       do { /* do nothing */ } while(0)
+#    define TRACE_PRINTF(level, args...)     do { /* do nothing */ } while(0)
+#    define TRACE_PRINTF_LOC(level, args...) do { /* do nothing */ } while(0)
+#endif
 
-#if defined(DEBUG_DEV) || defined(DEBUG_FULL)
+#if defined (USE_TRACE) && (defined(DEBUG_DEV) || defined(DEBUG_FULL))
 #    define DBG_TRACE(msg, mask, args...)        TRACE(msg, mask, ##args)
 #    define DBG_TRACE_ERROR(msg, mask, args...)  TRACE_ERROR(msg, mask, ##args)
 #    define DBG_TRACE_USER(msg, mask, args...)   TRACE_USER(msg, mask, ##args)

reg-tests/checks/4be_1srv_smtpchk_httpchk_layer47errors.vtc

@@ -29,7 +29,7 @@ syslog S3 -level notice {
 
 syslog S4 -level notice {
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be4/srv4 failed.+reason: Layer4 connection problem.+info: \"Connection refused\".+check duration: [[:digit:]]+ms.+status: 0/1 DOWN."
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be4/srv4 failed.+reason: Layer4 connection problem.+info: \"ECONNREFUSED returned by OS.*\".+check duration: [[:digit:]]+ms.+status: 0/1 DOWN."
 } -start
 
 server s1 {

reg-tests/checks/tcp-check_multiple_ports.vtc

@@ -7,12 +7,12 @@ feature ignore_unknown_macro
 
 syslog S1 -level notice {
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be1/srv1 failed.*Connection refused at step 2 of tcp-check.*connect port 1"
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be1/srv1 failed.*ECONNREFUSED returned by OS.* at step 2 of tcp-check.*connect port 1"
 } -start
 
 syslog S2 -level notice {
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be2/srv1 failed.*Connection refused at step 1 of tcp-check.*connect port 1"
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be2/srv1 failed.*ECONNREFUSED returned by OS.* at step 1 of tcp-check.*connect port 1"
 } -start
 
 server s1 {

reg-tests/http-messaging/websocket.vtc

@@ -146,7 +146,7 @@ client c1 -connect ${hap_fe1_sock} {
 } -run
 
 # missing websocket key
-client c2 -connect ${hap_fe1_sock} {
+client c2_1 -connect ${hap_fe1_sock} {
 	txreq \
 	  -req "GET" \
 	  -url "/" \
@@ -158,6 +158,19 @@ client c2 -connect ${hap_fe1_sock} {
 	expect resp.status == 400
 } -run
 
+client c2_2 -connect ${hap_fe1_sock} {
+	txreq \
+	  -req "GET" \
+	  -url "/" \
+	  -hdr "host: 127.0.0.1" \
+	  -hdr "connection: upgrade" \
+	  -hdr "upgrade: proto1, websocket, proto2" \
+	  -hdr "upgrade: proto3"
+
+	rxresp
+	expect resp.status == 400
+} -run
+
 # missing key on server side
 client c3 -connect ${hap_fe2_sock} {
 	txreq \

reg-tests/proxy/cli_add_backend.vtc

@@ -50,10 +50,10 @@ client c1 -connect ${h1_feS_sock} {
 
 haproxy h1 -cli {
 	# non existent backend
-	send "experimental-mode on; add backend be from def"
+	send "add backend be from def"
 	expect ~ "Mode is required"
 
-	send "experimental-mode on; add backend be from def_http"
+	send "add backend be from def_http"
 	expect ~ "New backend registered."
 
 	send "add server be/srv ${hsrv_fe_addr}:${hsrv_fe_port}"

reg-tests/proxy/cli_del_backend.vtc

@@ -40,29 +40,29 @@ haproxy h1 -conf {
 } -start
 
 haproxy h1 -cli {
-	send "experimental-mode on; del backend other"
+	send "del backend other"
 	expect ~ "No such backend."
 
-	send "experimental-mode on; del backend li"
+	send "del backend li"
 	expect ~ "Cannot delete a listen section."
 
-	send "experimental-mode on; del backend be_ref"
+	send "del backend be_ref"
 	expect ~ "This proxy cannot be removed at runtime due to other configuration elements pointing to it."
 
 	send "show stat be 2 -1"
 	expect ~ "be,BACKEND,"
 
-	send "experimental-mode on; del backend be"
+	send "del backend be"
 	expect ~ "Backend must be unpublished prior to its deletion."
 
 	send "unpublish backend be;"
 	expect ~ ".*"
-	send "experimental-mode on; del backend be"
+	send "del backend be"
 	expect ~ "Only a backend without server can be deleted."
 
 	send "del server be/s1"
 	expect ~ ".*"
-	send "experimental-mode on; del backend be"
+	send "del backend be"
 	expect ~ "Backend deleted."
 
 	send "show stat be 2 -1"
@@ -75,7 +75,7 @@ haproxy h1 -cli {
 
 	send "unpublish backend be_unnamed_def_ref;"
 	expect ~ ".*"
-	send "experimental-mode on; del backend be_unnamed_def_ref"
+	send "del backend be_unnamed_def_ref"
 	expect ~ "Backend deleted."
 
 	send "show stat be_unnamed_def_ref 2 -1"
@@ -83,6 +83,6 @@ haproxy h1 -cli {
 
 	send "unpublish backend be_unnamed_def_ref2;"
 	expect ~ ".*"
-	send "experimental-mode on; del backend be_unnamed_def_ref2"
+	send "del backend be_unnamed_def_ref2"
 	expect ~ "Backend deleted."
 }

reg-tests/quic/tls13_ssl_crt-list_filters.vtc

@@ -1,10 +1,12 @@
 #REGTEST_TYPE=bug
 varnishtest "Test for ECDSA/RSA selection and crt-list filters"
 feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.8)'"
-feature cmd "$HAPROXY_PROGRAM -cc 'feature(QUIC)'"
+# QUIC backend are not supported with USE_QUIC_OPENSSL_COMPAT
+feature cmd "$HAPROXY_PROGRAM -cc 'feature(QUIC) && !feature(QUIC_OPENSSL_COMPAT) && !feature(OPENSSL_WOLFSSL)'"
 # Note that USE_OPENSSL is always set if USE_QUIC is set
 # Same conditions as for ssl/tls13_ssl_crt-list_filters.vtc about TLS library versions
 feature cmd "$HAPROXY_PROGRAM -cc 'ssllib_name_startswith(OpenSSL) && openssl_version_atleast(1.1.1) || feature(OPENSSL_AWSLC)'"
+
 # This test checks if the multiple certificate types works correctly with the
 # SNI, and that the negative filters are correctly excluded
 #

reg-tests/ssl/issuers_chain_path.vtci

@@ -6,6 +6,10 @@ haproxy h1 -conf {
         thread-groups 1
     .endif
 
+    .if feature(QUIC_OPENSSL_COMPAT)
+        limited-quic
+    .endif
+
         stats socket "${tmpdir}/h1/stats" level admin
         issuers-chain-path "${testdir}/certs/issuers-chain-path/ca/"
         crt-base "${testdir}/certs/issuers-chain-path"

src/acme.c

@@ -1562,6 +1562,16 @@ int acme_res_certificate(struct task *task, struct acme_ctx *ctx, char **errmsg)
 	key = ctx->store->data->key;
 	ctx->store->data->key = NULL;
 
+	/* OpenSSL's BIO_new_mem_buf() expects a NUL-terminated string when
+	 * passed -1. The httpclient buffer lacks this, so manually terminate
+	 * it here to prevent an out-of-bounds heap read during PEM parsing.
+	 */
+	if (b_room(&hc->res.buf) < 1) {
+		memprintf(errmsg, "ACME certificate response has no room for NUL terminator");
+		goto error;
+	}
+	hc->res.buf.area[hc->res.buf.data] = '\0';
+
 	/* XXX: might need a function dedicated to this, which does not read a private key */
 	if (ssl_sock_load_pem_into_ckch(ctx->store->path, hc->res.buf.area, ctx->store->data , errmsg) != 0)
 		goto error;

src/applet.c

@@ -539,9 +539,6 @@ size_t appctx_rcv_buf(struct stconn *sc, struct buffer *buf, size_t count, unsig
 	if (applet_fl_test(appctx, APPCTX_FL_OUTBLK_ALLOC))
 		goto end;
 
-	if (!count)
-		goto end;
-
 	if (!appctx_get_buf(appctx, &appctx->outbuf)) {
 		TRACE_STATE("waiting for appctx outbuf allocation", APPLET_EV_RECV|APPLET_EV_BLK, appctx);
 		goto end;
@@ -550,7 +547,8 @@ size_t appctx_rcv_buf(struct stconn *sc, struct buffer *buf, size_t count, unsig
 	if (flags & CO_RFL_BUF_FLUSH)
 		applet_fl_set(appctx, APPCTX_FL_FASTFWD);
 
-	ret = CALL_APPLET_WITH_RET(appctx->applet, rcv_buf(appctx, buf, count, flags));
+	if (count)
+		ret = CALL_APPLET_WITH_RET(appctx->applet, rcv_buf(appctx, buf, count, flags));
 	if (ret)
 		applet_fl_clr(appctx, APPCTX_FL_OUTBLK_FULL);
 
@@ -608,7 +606,7 @@ size_t appctx_htx_snd_buf(struct appctx *appctx, struct buffer *buf, size_t coun
 		goto end;
 	}
 
-	htx_xfer(appctx_htx, buf_htx, count, HTX_XFER_DEFAULT);
+	htx_xfer(appctx_htx, buf_htx, count, HTX_XFER_NO_METADATA);
 	if (htx_is_empty(buf_htx)) {
 		appctx_htx->flags |= (buf_htx->flags & HTX_FL_EOM);
 	}

src/backend.c

@@ -87,7 +87,7 @@ unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len
 		hash = hash_crc32(key, len);
 		break;
 	case BE_LB_HFCN_NONE:
-		/* use key as a hash */
+		/* use key as a hash. It MUST be in string format */
 		{
 			const char *_key = key;
 
@@ -370,11 +370,11 @@ struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
 				len -= plen + 1;
 
 				while (len && *end != '&') {
-					if (unlikely(!HTTP_IS_TOKEN(*p))) {
+					if (unlikely(!HTTP_IS_TOKEN(*end))) {
 						/* if in a POST, body must be URI encoded or it's not a URI.
 						 * Do not interpret any possible binary data as a parameter.
 						 */
-						if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
+						if (likely(HTTP_IS_LWS(*end))) /* eol, uncertain uri len */
 							break;
 						return NULL;                 /* oh, no; this is not uri-encoded.
 									      * This body does not contain parameters.
@@ -545,7 +545,14 @@ struct server *get_server_expr(struct stream *s, const struct server *avoid)
 	if (px->lbprm.tot_used == 1)
 		goto hash_done;
 
-	smp = sample_fetch_as_type(px, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL, px->lbprm.expr, SMP_T_BIN);
+	/* Note that if the hash-type doesn't hash the key, we must provide it
+	 * as a string representing a number as it will be parsed by read_int64().
+	 * Otherwise it's binary. The difference happens on samples returing
+	 * ints (e.g. rand()) as well as IP addresses, which, when turned to
+	 * binary, are just binary-encoded and cannot be parsed.
+	 */
+	smp = sample_fetch_as_type(px, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL, px->lbprm.expr,
+				   ((px->lbprm.algo & BE_LB_HASH_FUNC) == BE_LB_HFCN_NONE) ? SMP_T_STR : SMP_T_BIN);
 	if (!smp)
 		return NULL;
 
@@ -1811,7 +1818,10 @@ int connect_server(struct stream *s)
 {
 	struct connection *cli_conn = objt_conn(strm_orig(s));
 	struct connection *srv_conn = NULL;
+	const struct mux_proto_list *mux_proto = NULL;
 	struct server *srv;
+	struct ist name = IST_NULL;
+	struct sample *name_smp;
 	int reuse_mode;
 	int reuse __maybe_unused = 0;
 	int may_use_early_data __maybe_unused = 1; // are we allowed to use early data ?
@@ -1833,6 +1843,17 @@ int connect_server(struct stream *s)
 	if (err != SRV_STATUS_OK)
 		return SF_ERR_INTERNAL;
 
+	if (srv && srv->pool_conn_name_expr) {
+		name_smp = sample_fetch_as_type(s->be, s->sess, s,
+				SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
+				srv->pool_conn_name_expr, SMP_T_STR);
+		if (name_smp) {
+			name = ist2(name_smp->data.u.str.area,
+					name_smp->data.u.str.data);
+		}
+	}
+	hash = be_calculate_conn_hash(srv, s, s->sess, bind_addr, s->scb->dst, name);
+
 	if (!be_supports_conn_reuse(s->be))
 		goto skip_reuse;
 
@@ -1844,20 +1865,7 @@ int connect_server(struct stream *s)
 	}
 	else {
 		const int not_first_req = s->txn.http && s->txn.http->flags & TX_NOT_FIRST;
-		struct ist name = IST_NULL;
-		struct sample *name_smp;
 
-		if (srv && srv->pool_conn_name_expr) {
-			name_smp = sample_fetch_as_type(s->be, s->sess, s,
-			                                SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
-			                                srv->pool_conn_name_expr, SMP_T_STR);
-			if (name_smp) {
-				name = ist2(name_smp->data.u.str.area,
-				            name_smp->data.u.str.data);
-			}
-		}
-
-		hash = be_calculate_conn_hash(srv, s, s->sess, bind_addr, s->scb->dst, name);
 		err = be_reuse_connection(hash, s->sess, s->be, srv, s->scb,
 		                          s->target, not_first_req);
 		if (err == SF_ERR_INTERNAL)
@@ -2079,7 +2087,7 @@ int connect_server(struct stream *s)
 			if (IS_HTX_STRM(s) && srv->use_ssl &&
 			    (srv->ssl_ctx.alpn_str || srv->ssl_ctx.npn_str)) {
 				HA_RWLOCK_RDLOCK(SERVER_LOCK, &srv->path_params.param_lock);
-				if (srv->path_params.nego_alpn[0] == 0)
+				if (srv->path_params.srv_hash != hash || srv->path_params.nego_alpn[0] == 0)
 					may_start_mux_now = 0;
 				HA_RWLOCK_RDUNLOCK(SERVER_LOCK, &srv->path_params.param_lock);
 			}
@@ -2130,9 +2138,11 @@ int connect_server(struct stream *s)
 			srv_conn->flags |= CO_FL_SOCKS4;
 		}
 
-		if (srv && srv->mux_proto && isteq(srv->mux_proto->token, ist("qmux"))) {
+		if (may_start_mux_now) {
-			srv_conn->flags |= (CO_FL_QMUX_RECV|CO_FL_QMUX_SEND);
+			/* Delay MUX init if an XPRT handshake is required prior. */
-			may_start_mux_now = 0;
+			mux_proto = conn_select_mux_be(srv_conn);
+			if (mux_proto && mux_proto->init_xprt)
+				may_start_mux_now = 0;
 		}
 
 #if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
@@ -2242,6 +2252,13 @@ int connect_server(struct stream *s)
 			}
 		}
 	}
+	else if (mux_proto && mux_proto->init_xprt) {
+		/* Add handshake layer prior to MUX init if required. Does nothing if SSL layer is active though. */
+		if (xprt_add_l6hs(srv_conn, mux_proto->init_xprt)) {
+			conn_full_close(srv_conn);
+			return SF_ERR_INTERNAL;
+		}
+	}
 
 	/*
 	 * Now that the mux may have been created, we can start the xprt.

src/cache.c

@@ -2180,7 +2180,17 @@ enum act_return http_action_req_cache_use(struct act_rule *rule, struct proxy *p
 				sec_entry = get_secondary_entry(cache_tree, res,
 				                                s->txn.http->cache_secondary_hash,
 				                                0);
-				if (sec_entry && sec_entry != res) {
+				if (!sec_entry) {
+					/* Secondary key miss: release the retained primary entry
+					 * and reattach the detached row before returning.
+					 */
+					release_entry(cache_tree, res, 0);
+					shctx_wrlock(shctx);
+					if (detached)
+						shctx_row_reattach(shctx, entry_block);
+					shctx_wrunlock(shctx);
+				}
+				else if (sec_entry != res) {
 					/* The wrong row was added to the hot list. */
 					release_entry(cache_tree, res, 0);
 					retain_entry(sec_entry);

src/cfgparse-global.c

@@ -1629,11 +1629,6 @@ static int cfg_parse_global_shm_stats_file(char **args, int section_type,
 				           struct proxy *curpx, const struct proxy *defpx,
 				           const char *file, int line, char **err)
 {
-	if (!experimental_directives_allowed) {
-		memprintf(err, "'%s' directive is experimental, must be allowed via a global 'expose-experimental-directives'", args[0]);
-		return -1;
-	}
-
 	if (global.shm_stats_file != NULL) {
 		memprintf(err, "'%s' already specified.\n", args[0]);
 		return -1;
@@ -1644,7 +1639,6 @@ static int cfg_parse_global_shm_stats_file(char **args, int section_type,
 		return -1;
 	}
 
-	mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
 	global.shm_stats_file = strdup(args[1]);
 	return 0;
 }
@@ -1653,11 +1647,6 @@ static int cfg_parse_global_shm_stats_file_max_objects(char **args, int section_
 				                       struct proxy *curpx, const struct proxy *defpx,
 				                       const char *file, int line, char **err)
 {
-	if (!experimental_directives_allowed) {
-		memprintf(err, "'%s' directive is experimental, must be allowed via a global 'expose-experimental-directives'", args[0]);
-		return -1;
-	}
-
 	if (shm_stats_file_max_objects != -1) {
 		memprintf(err, "'%s' already specified.\n", args[0]);
 		return -1;
@@ -1668,7 +1657,6 @@ static int cfg_parse_global_shm_stats_file_max_objects(char **args, int section_
 		return -1;
 	}
 
-	mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
 	shm_stats_file_max_objects = atoi(args[1]);
 	return 0;
 }

src/cfgparse-ssl.c

@@ -1495,7 +1495,7 @@ static int bind_parse_tls_ticket_keys(char **args, int cur_arg, struct proxy *px
 		goto fail;
 	}
 
-	keys_ref->tlskeys = malloc(TLS_TICKETS_NO * sizeof(union tls_sess_key));
+	keys_ref->tlskeys = malloc(array_size_or_fail(TLS_TICKETS_NO, sizeof(union tls_sess_key)));
 	if (!keys_ref->tlskeys) {
 		memprintf(err, "'%s' : allocation error", args[cur_arg+1]);
 		goto fail;

src/cfgparse.c

@@ -1394,7 +1394,7 @@ int parse_cfg(const struct cfgfile *cfg)
 	global.cfg_curr_line = 0;
 	global.cfg_curr_file = file;
 
-	if ((thisline = malloc(sizeof(*thisline) * linesize)) == NULL) {
+	if ((thisline = malloc(array_size_or_fail(sizeof(*thisline), linesize))) == NULL) {
 		ha_alert("Out of memory trying to allocate a buffer for a configuration line.\n");
 		err_code = -1;
 		goto err;
@@ -1442,7 +1442,7 @@ next_line:
 			char *newline;
 			int newlinesize = linesize * 2;
 
-			newline = realloc(thisline, sizeof(*thisline) * newlinesize);
+			newline = realloc(thisline, array_size_or_fail(sizeof(*thisline), newlinesize));
 			if (newline == NULL) {
 				ha_alert("parsing [%s:%d]: line too long, cannot allocate memory.\n",
 					 file, linenum);

src/check.c

@@ -812,7 +812,7 @@ void chk_report_conn_err(struct check *check, int errno_bck, int expired)
 	}
 
 	errno = unclean_errno(errno_bck);
-	if (conn && errno)
+	if (conn && !errno)
 		retrieve_errno_from_socket(conn);
 
 	TRACE_ENTER(CHK_EV_HCHK_END|CHK_EV_HCHK_ERR, check, 0, 0, (size_t[]){expired});

src/cli.c

@@ -1151,8 +1151,13 @@ int cli_parse_cmdline(struct appctx *appctx)
 			 */
 			if (len-1 == strlen(appctx->cli_ctx.payload_pat)) {
 				if (strncmp(str, appctx->cli_ctx.payload_pat, len-1) == 0) {
-					/* end of payload was reached, rewind before the previous \n and replace it by a \0 */
+					/* end of payload was reached, rewind before the previous \n, if any, and replace it by a \0
-					b_sub(buf, strlen(appctx->cli_ctx.payload_pat) + 2);
+					 * Otherwise, the payload is empty, just
+					 */
+					if (b_data(buf) > len)
+						b_sub(buf, len+1);
+					else
+						b_sub(buf, len);
 					*b_tail(buf) = '\0';
 					appctx->st1 &= ~APPCTX_CLI_ST1_PAYLOAD;
 				}
@@ -2543,7 +2548,7 @@ static int _getsocks(char **args, char *payload, struct appctx *appctx, void *pr
 	/* We will send sockets MAX_SEND_FD per MAX_SEND_FD, allocate a
 	 * buffer big enough to store the socket information.
 	 */
-	tmpbuf = malloc(MAX_SEND_FD * (1 + MAXPATHLEN + 1 + IFNAMSIZ + sizeof(int)));
+	tmpbuf = malloc(array_size_or_fail(MAX_SEND_FD, (1 + MAXPATHLEN + 1 + IFNAMSIZ + sizeof(int))));
 	if (tmpbuf == NULL) {
 		ha_warning("Failed to allocate memory to transfer socket information\n");
 		goto out;

src/connection.c

@@ -196,7 +196,7 @@ int conn_notify_mux(struct connection *conn, int old_flags, int forced_wake)
 	 * information to create one, typically from the ALPN. If we're
 	 * done with the handshake, attempt to create one.
 	 */
-	if (unlikely(!conn->mux) && !(conn->flags & (CO_FL_WAIT_XPRT|CO_FL_QMUX_RECV|CO_FL_QMUX_SEND))) {
+	if (unlikely(!conn->mux) && !(conn->flags & (CO_FL_WAIT_XPRT|CO_FL_WAIT_XPRT_L6))) {
 		ret = conn_create_mux(conn, NULL);
 		if (ret < 0)
 			goto done;
@@ -282,6 +282,7 @@ int conn_upgrade_mux_fe(struct connection *conn, void *ctx, struct buffer *buf,
                         struct ist mux_proto, int mode)
 {
 	struct bind_conf *bind_conf = __objt_listener(conn->target)->bind_conf;
+	struct ist alpn = IST_NULL;
 	const struct mux_ops *old_mux, *new_mux;
 	void *old_mux_ctx;
 	const char *alpn_str = NULL;
@@ -289,9 +290,9 @@ int conn_upgrade_mux_fe(struct connection *conn, void *ctx, struct buffer *buf,
 
 	if (!mux_proto.len) {
 		conn_get_alpn(conn, &alpn_str, &alpn_len);
-		mux_proto = ist2(alpn_str, alpn_len);
+		alpn = ist2(alpn_str, alpn_len);
 	}
-	new_mux = conn_get_best_mux(conn, mux_proto, PROTO_SIDE_FE, mode);
+	new_mux = conn_get_best_mux(conn, mux_proto, alpn, PROTO_SIDE_FE, mode);
 	old_mux = conn->mux;
 
 	/* No mux found */
@@ -318,6 +319,29 @@ int conn_upgrade_mux_fe(struct connection *conn, void *ctx, struct buffer *buf,
 	return 0;
 }
 
+/* Returns the mux_proto_list entry compatible with <conn> frontend connection
+ * or NULL if nothing eligible.
+ * TODO duplicate code to merge with conn_install_mux_fe().
+ */
+const struct mux_proto_list *conn_select_mux_fe(const struct connection *conn)
+{
+	struct bind_conf *bind_conf;
+	const char *alpn_str = NULL;
+	struct ist alpn;
+	int alpn_len = 0, mode;
+
+	bind_conf = __objt_listener(conn->target)->bind_conf;
+
+	if (bind_conf->mux_proto)
+		return bind_conf->mux_proto;
+
+	mode = conn_pr_mode_to_proto_mode(bind_conf->frontend->mode);
+	conn_get_alpn(conn, &alpn_str, &alpn_len);
+	alpn = ist2(alpn_str, alpn_len);
+	return conn_get_best_mux_entry(IST_NULL, alpn, PROTO_SIDE_FE,
+	                               proto_is_quic(conn->ctrl), mode);
+}
+
 /* installs the best mux for incoming connection <conn> using the upper context
  * <ctx>. If the mux protocol is forced, we use it to find the best
  * mux. Otherwise we use the ALPN name, if any. Returns < 0 on error.
@@ -330,14 +354,14 @@ int conn_install_mux_fe(struct connection *conn, void *ctx)
 	if (bind_conf->mux_proto)
 		mux_ops = bind_conf->mux_proto->mux;
 	else {
-		struct ist mux_proto;
+		struct ist alpn;
 		const char *alpn_str = NULL;
 		int alpn_len = 0;
 		int mode = conn_pr_mode_to_proto_mode(bind_conf->frontend->mode);
 
 		conn_get_alpn(conn, &alpn_str, &alpn_len);
-		mux_proto = ist2(alpn_str, alpn_len);
+		alpn = ist2(alpn_str, alpn_len);
-		mux_ops = conn_get_best_mux(conn, mux_proto, PROTO_SIDE_FE, mode);
+		mux_ops = conn_get_best_mux(conn, IST_NULL, alpn, PROTO_SIDE_FE, mode);
 		if (!mux_ops)
 			return -1;
 	}
@@ -353,6 +377,66 @@ int conn_install_mux_fe(struct connection *conn, void *ctx)
 	return conn_install_mux(conn, mux_ops, ctx, bind_conf->frontend, conn->owner);
 }
 
+/* Returns the mux_proto_list entry compatible with <conn> backend connection
+ * or NULL if nothing eligible.
+ * TODO duplicate code to merge with conn_install_mux_be/chk().
+ */
+const struct mux_proto_list *conn_select_mux_be(const struct connection *conn)
+{
+	struct session *sess;
+	struct server *srv;
+	struct proxy *prx;
+	struct check *check;
+	struct ist alpn;
+	const char *alpn_str = NULL;
+	int alpn_len = 0, mode;
+
+	sess = conn->owner;
+	if (sess && obj_type(sess->origin) == OBJ_TYPE_CHECK) {
+		check = __objt_check(sess->origin);
+		if (check->mux_proto)
+			return check->mux_proto;
+
+		mode = tcpchk_rules_type_to_proto_mode(check->tcpcheck->rs->flags);
+
+		conn_get_alpn(conn, &alpn_str, &alpn_len);
+		alpn = ist2(alpn_str, alpn_len);
+
+		return conn_get_best_mux_entry(IST_NULL, alpn, PROTO_SIDE_BE,
+		                               proto_is_quic(conn->ctrl), mode);
+	}
+	else {
+		srv = objt_server(conn->target);
+		prx = objt_proxy(conn->target);
+		if (srv)
+			prx = srv->proxy;
+
+		if (!prx) {
+			/* Target should either be a server or a proxy.
+			 * USE a full a BUG_ON() once considered definitive.
+			 */
+			BUG_ON_HOT(1);
+			return NULL;
+		}
+
+		mode = conn_pr_mode_to_proto_mode(prx->mode);
+
+		if (srv && srv->mux_proto)
+			return srv->mux_proto;
+
+		if (!conn_get_alpn(conn, &alpn_str, &alpn_len)) {
+			if (srv && srv->path_params.nego_alpn[0]) {
+				alpn_str = srv->path_params.nego_alpn;
+				alpn_len = strlen(alpn_str);
+			}
+		}
+		alpn = ist2(alpn_str, alpn_len);
+
+		return conn_get_best_mux_entry(IST_NULL, alpn, PROTO_SIDE_BE,
+		                               proto_is_quic(conn->ctrl), mode);
+	}
+}
+
 /* installs the best mux for outgoing connection <conn> using the upper context
  * <ctx>. If the server mux protocol is forced, we use it to find the best mux.
  * It's also possible to specify an alternative mux protocol <force_mux_ops>,
@@ -380,20 +464,20 @@ int conn_install_mux_be(struct connection *conn, void *ctx, struct session *sess
 		mux_ops = force_mux_ops;
 	}
 	else {
-		struct ist mux_proto;
+		struct ist alpn;
 		const char *alpn_str = NULL;
 		int alpn_len = 0;
 		int mode = conn_pr_mode_to_proto_mode(prx->mode);
 
 		if (!conn_get_alpn(conn, &alpn_str, &alpn_len)) {
-			if (srv && srv->path_params.nego_alpn[0]) {
+			if (srv && srv->path_params.srv_hash == conn->hash_node.key && srv->path_params.nego_alpn[0]) {
 				alpn_str = srv->path_params.nego_alpn;
 				alpn_len = strlen(alpn_str);
 			}
 		}
-		mux_proto = ist2(alpn_str, alpn_len);
+		alpn = ist2(alpn_str, alpn_len);
 
-		mux_ops = conn_get_best_mux(conn, mux_proto, PROTO_SIDE_BE, mode);
+		mux_ops = conn_get_best_mux(conn, IST_NULL, alpn, PROTO_SIDE_BE, mode);
 		if (!mux_ops)
 			return -1;
 	}
@@ -434,15 +518,15 @@ int conn_install_mux_chk(struct connection *conn, void *ctx, struct session *ses
 	if (check->mux_proto)
 		mux_ops = check->mux_proto->mux;
 	else {
-		struct ist mux_proto;
+		struct ist alpn;
 		const char *alpn_str = NULL;
 		int alpn_len = 0;
 		int mode = tcpchk_rules_type_to_proto_mode(check->tcpcheck->rs->flags);
 
 		conn_get_alpn(conn, &alpn_str, &alpn_len);
-		mux_proto = ist2(alpn_str, alpn_len);
+		alpn = ist2(alpn_str, alpn_len);
 
-		mux_ops = conn_get_best_mux(conn, mux_proto, PROTO_SIDE_BE, mode);
+		mux_ops = conn_get_best_mux(conn, IST_NULL, alpn, PROTO_SIDE_BE, mode);
 		if (!mux_ops)
 			return -1;
 	}
@@ -763,6 +847,43 @@ int xprt_add_hs(struct connection *conn)
 	return 0;
 }
 
+/* Activates an <xprt> layer on top of <conn> connection. This handshake layer
+ * should be designed to work on top of the layer 6. If SSL is active and its
+ * handshake still in progress, this function does nothing.
+ *
+ * Returns 0 on success else a negative error code.
+ */
+int xprt_add_l6hs(struct connection *conn, int xprt)
+{
+	const struct xprt_ops *ops = xprt_get(xprt);
+	void *ops_ctx = NULL;
+
+	/* Only QMux is supported as handshake on top of layer6 for now. */
+	BUG_ON(xprt != XPRT_QMUX);
+
+	if (conn->flags & CO_FL_ERROR)
+		return -1;
+
+	/* Do nothing if SSL is in used but handshake still in progress. In
+	 * this case, xprt layer will be added on handshake completion.
+	 */
+	if (conn->xprt == xprt_get(XPRT_SSL) &&
+	    (conn->flags & CO_FL_WAIT_L6_CONN)) {
+		return 0;
+	}
+
+	if (ops->init(conn, &ops_ctx))
+		return -1;
+
+	ops->add_xprt(conn, ops_ctx, conn->xprt_ctx, conn->xprt, NULL, NULL);
+	conn->xprt = ops;
+	conn->xprt_ctx = ops_ctx;
+	/* Reset XPRT READY flag before the next conn_xprt_start(). */
+	conn->flags &= ~CO_FL_XPRT_READY;
+
+	return 0;
+}
+
 /* returns a short name for an error, typically the same as the enum name
  * without the "CO_ER_" prefix, or an empty string for no error (better eye
  * catching in logs). This is more compact for some debug cases.
@@ -1991,7 +2112,7 @@ void list_mux_proto(FILE *out)
 	fprintf(out, "Available multiplexer protocols :\n"
 		"(protocols marked as <default> cannot be specified using 'proto' keyword)\n");
 	list_for_each_entry(item, &mux_proto_list.list, list) {
-		proto = item->token;
+		proto = item->mux_proto;
 
 		if (item->mode == PROTO_MODE_ANY)
 			mode = "TCP|HTTP";

src/dict.c

@@ -79,7 +79,7 @@ static struct dict_entry *__dict_lookup(struct dict *d, const char *s)
  */
 struct dict_entry *dict_insert(struct dict *d, char *s)
 {
-	struct dict_entry *de;
+	struct dict_entry *de, *tree_de;
 	struct ebpt_node *n;
 
 	HA_RWLOCK_RDLOCK(DICT_LOCK, &d->rwlock);
@@ -97,13 +97,18 @@ struct dict_entry *dict_insert(struct dict *d, char *s)
 
 	HA_RWLOCK_WRLOCK(DICT_LOCK, &d->rwlock);
 	n = ebis_insert(&d->values, &de->value);
-	HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+	tree_de = container_of(n, struct dict_entry, value);
-	if (n != &de->value) {
+	if (tree_de == de)
+		HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+	else {
+		/* another entry was already there, we'll return it, kill
+		 * ours and bump the other's refcount before returning it.
+		 */
+		HA_ATOMIC_INC(&tree_de->refcount);
+		HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
 		free_dict_entry(de);
-		de = container_of(n, struct dict_entry, value);
 	}
-
+	return tree_de;
-	return de;
 }
 
 
@@ -117,10 +122,11 @@ void dict_entry_unref(struct dict *d, struct dict_entry *de)
 	if (!de)
 		return;
 
-	if (HA_ATOMIC_SUB_FETCH(&de->refcount, 1) != 0)
-		return;
-
 	HA_RWLOCK_WRLOCK(DICT_LOCK, &d->rwlock);
+	if (HA_ATOMIC_SUB_FETCH(&de->refcount, 1) != 0) {
+		HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+		return;
+	}
 	ebpt_delete(&de->value);
 	HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
 

src/dns.c

@@ -194,7 +194,7 @@ int dns_send_nameserver(struct dns_nameserver *ns, void *buf, size_t len)
 		struct ist myist;
 
 		myist = ist2(buf, len);
-                ret = dns_ring_write(ns->stream->ring_req, DNS_TCP_MSG_MAX_SIZE, NULL, 0, &myist, 1);
+		ret = dns_ring_write(ns->stream->ring_req, DNS_TCP_MSG_MAX_SIZE, NULL, 0, &myist, 1);
 		if (!ret) {
 			ns->counters->snd_error++;
 			return -1;
@@ -215,7 +215,7 @@ void dns_session_free(struct dns_session *);
  */
 ssize_t dns_recv_nameserver(struct dns_nameserver *ns, void *data, size_t size)
 {
-        ssize_t ret = -1;
+	ssize_t ret = -1;
 
 	if (ns->dgram) {
 		struct dgram_conn *dgram = &ns->dgram->conn;
@@ -475,7 +475,6 @@ int dns_dgram_init(struct dns_nameserver *ns, struct sockaddr_storage *sk)
 	dgram->conn.t.sock.fd = -1;
 	dgram->conn.addr.to = *sk;
 	HA_SPIN_INIT(&dgram->conn.lock);
-	ns->dgram = dgram;
 
 	dgram->ofs_req = ~0; /* init ring offset */
 	dgram->ring_req = dns_ring_new(2*DNS_TCP_MSG_RING_MAX_SIZE);
@@ -490,6 +489,7 @@ int dns_dgram_init(struct dns_nameserver *ns, struct sockaddr_storage *sk)
 		ha_alert("nameserver sets too many watchers > 255 on ring. This is a bug and should not happen.\n");
 		goto out;
 	}
+	ns->dgram = dgram;
 	return 0;
 out:
 	dns_ring_free(dgram->ring_req);
@@ -913,6 +913,7 @@ static int dns_session_init(struct appctx *appctx)
 	return 0;
 
   error:
+	sockaddr_free(&addr);
 	return -1;
 }
 
@@ -1345,8 +1346,8 @@ int dns_stream_init(struct dns_nameserver *ns, struct server *srv)
 {
 	struct dns_stream_server *dss = NULL;
 
-        dss = calloc(1, sizeof(*dss));
+	dss = calloc(1, sizeof(*dss));
-        if (!dss) {
+	if (!dss) {
 		ha_alert("memory allocation error initializing dns tcp server '%s'.\n", srv->id);
 		goto out;
 	}
@@ -1362,7 +1363,7 @@ int dns_stream_init(struct dns_nameserver *ns, struct server *srv)
 	}
 	/* Create the task associated to the resolver target handling conns */
 	if ((dss->task_req = task_new_anywhere()) == NULL) {
-		ha_alert("memory allocation error initializing the ring for dns tcp server '%s'.\n", srv->id);
+		ha_alert("memory allocation error initializing req task for dns tcp server '%s'.\n", srv->id);
 		goto out;
 	}
 
@@ -1379,7 +1380,7 @@ int dns_stream_init(struct dns_nameserver *ns, struct server *srv)
 
 	/* Create the task associated to the resolver target handling conns */
 	if ((dss->task_rsp = task_new_anywhere()) == NULL) {
-		ha_alert("memory allocation error initializing the ring for dns tcp server '%s'.\n", srv->id);
+		ha_alert("memory allocation error initializing rsp task for dns tcp server '%s'.\n", srv->id);
 		goto out;
 	}
 
@@ -1389,7 +1390,7 @@ int dns_stream_init(struct dns_nameserver *ns, struct server *srv)
 
 	/* Create the task associated to the resolver target handling conns */
 	if ((dss->task_idle = task_new_anywhere()) == NULL) {
-		ha_alert("memory allocation error initializing the ring for dns tcp server '%s'.\n", srv->id);
+		ha_alert("memory allocation error initializing idle task for dns tcp server '%s'.\n", srv->id);
 		goto out;
 	}
 
@@ -1425,7 +1426,7 @@ int init_dns_buffers()
 	if (!dns_msg_trash)
 		return 0;
 
-        return 1;
+	return 1;
 }
 
 void deinit_dns_buffers()

src/errors.c

@@ -110,7 +110,7 @@ static void usermsgs_put(const struct ist *msg)
 {
 	/* Allocate the buffer if not already done. */
 	if (unlikely(b_is_null(&usermsgs_buf))) {
-		usermsgs_buf.area = malloc(USER_MESSAGES_BUFSIZE * sizeof(char));
+		usermsgs_buf.area = malloc(array_size_or_fail(USER_MESSAGES_BUFSIZE, sizeof(char)));
 		if (usermsgs_buf.area)
 			usermsgs_buf.size = USER_MESSAGES_BUFSIZE;
 	}

src/extcheck.c

@@ -349,7 +349,7 @@ int prepare_external_check(struct check *check)
 	case PR_MODE_CLI:    svmode = "cli"; break;
 	case PR_MODE_SYSLOG: svmode = "syslog"; break;
 	case PR_MODE_PEERS:  svmode = "peers"; break;
-	case PR_MODE_HTTP:   svmode = (s->mux_proto) ? s->mux_proto->token.ptr : "h1"; break;
+	case PR_MODE_HTTP:   svmode = (s->mux_proto) ? s->mux_proto->mux_proto.ptr : "h1"; break;
 	case PR_MODE_TCP:    svmode = "tcp"; break;
 	case PR_MODE_SPOP:   svmode = "spop"; break;
 	/* all valid cases must be enumerated above, below is to avoid a warning */

src/fcgi-app.c

@@ -644,7 +644,7 @@ static int cfg_fcgi_apps_postparser()
 			px->options2 |= PR_O2_RSTRICT_REQ_HDR_NAMES_DEL;
 
 		for (srv = px->srv; srv; srv = srv->next) {
-			if (srv->mux_proto && isteq(srv->mux_proto->token, ist("fcgi"))) {
+			if (srv->mux_proto && isteq(srv->mux_proto->mux_proto, ist("fcgi"))) {
 				nb_fcgi_srv++;
 				if (fcgi_conf)
 					continue;

src/fd.c

@@ -1166,7 +1166,7 @@ int init_pollers()
 	struct poller *bp;
 
 	/* always provide an aligned fdtab */
-	if ((fdtab = ha_aligned_zalloc(64, global.maxsock * sizeof(*fdtab))) == NULL) {
+	if ((fdtab = ha_aligned_zalloc(64, array_size_or_fail(global.maxsock, sizeof(*fdtab)))) == NULL) {
 		ha_alert("Not enough memory to allocate %d entries for fdtab!\n", global.maxsock);
 		goto fail_tab;
 	}

src/h1.c

@@ -274,17 +274,17 @@ void h1_parse_connection_header(struct h1m *h1m, struct ist *value)
 
 /* Parse the Upgrade: header of an HTTP/1 request.
  * If "websocket" is found, set H1_MF_UPG_WEBSOCKET flag
- * If "h2c" or "h2" found, set H1_MF_UPG_H2C flag.
+ * If "h2c" or "h2" found, the value is skipped.
  */
-void h1_parse_upgrade_header(struct h1m *h1m, struct ist value)
+void h1_parse_upgrade_header(struct h1m *h1m, struct ist *value)
 {
-	char *e, *n;
+	char *e, *n, *p;
 	struct ist word;
 
-	h1m->flags &= ~(H1_MF_UPG_WEBSOCKET|H1_MF_UPG_H2C);
+	word.ptr = value->ptr - 1; // -1 for next loop's pre-increment
-
+	p = value->ptr;
-	word.ptr = value.ptr - 1; // -1 for next loop's pre-increment
+	e = value->ptr + value->len;
-	e = istend(value);
+	value->len = 0;
 
 	while (++word.ptr < e) {
 		/* skip leading delimiter and blanks */
@@ -301,9 +301,20 @@ void h1_parse_upgrade_header(struct h1m *h1m, struct ist value)
 		if (isteqi(word, ist("websocket")))
 			h1m->flags |= H1_MF_UPG_WEBSOCKET;
 		else if (isteqi(word, ist("h2c")) || isteqi(word, ist("h2")))
-			h1m->flags |= H1_MF_UPG_H2C;
+			goto skip_val;
 
-		word.ptr = n;
+		if (value->ptr + value->len == p) {
+			/* no rewrite done till now */
+			value->len = n - value->ptr;
+		}
+		else {
+			if (value->len)
+				value->ptr[value->len++] = ',';
+			istcat(value, word, e - value->ptr);
+		}
+
+	  skip_val:
+		word.ptr = p = n;
 	}
 }
 
@@ -983,7 +994,11 @@ int h1_headers_to_hdr_list(char *start, const char *stop,
 					}
 				}
 				else if (isteqi(n, ist("upgrade"))) {
-					h1_parse_upgrade_header(h1m, v);
+					h1_parse_upgrade_header(h1m, &v);
+					if (!v.len) {
+						/* skip it */
+						break;
+					}
 				}
 				else if (!(h1m->flags & H1_MF_RESP) && isteqi(n, ist("host"))) {
 					if (host_idx == -1) {

src/h1_htx.c

@@ -215,20 +215,6 @@ static int h1_postparse_req_hdrs(struct h1m *h1m, union h1_sl *h1sl, struct htx
 
 	flags |= h1m_htx_sl_flags(h1m);
 
-	/* Remove Upgrade header in problematic cases :
-	 * - "h2c" or "h2" token specified as token
-	 */
-	if ((h1m->flags & (H1_MF_CONN_UPG|H1_MF_UPG_H2C)) == (H1_MF_CONN_UPG|H1_MF_UPG_H2C)) {
-		int i;
-
-		for (i = 0; hdrs[i].n.len; i++) {
-			if (isteqi(hdrs[i].n, ist("upgrade")))
-				hdrs[i].v = IST_NULL;
-		}
-		h1m->flags &=~ H1_MF_CONN_UPG;
-		flags &= ~HTX_SL_F_CONN_UPG;
-	}
-
 	sl = htx_add_stline(htx, HTX_BLK_REQ_SL, flags, meth, uri, vsn);
 	if (!sl || !htx_add_all_headers(htx, hdrs))
 		goto error;

src/haproxy.c

@@ -1713,7 +1713,7 @@ void haproxy_init_args(int argc, char **argv)
 					oldpids_sig = SIGTERM; /* terminate immediately */
 				while (argc > 1 && argv[1][0] != '-') {
 					char * endptr = NULL;
-					oldpids = realloc(oldpids, (nb_oldpids + 1) * sizeof(int));
+					oldpids = realloc(oldpids, array_size_or_fail(nb_oldpids + 1, sizeof(int)));
 					if (!oldpids) {
 						ha_alert("Cannot allocate old pid : out of memory.\n");
 						exit(1);
@@ -1926,20 +1926,37 @@ static void dump_registered_keywords(void)
 
 /* Generate a random cluster-secret in case the setting is not provided in the
  * configuration. This allows to use features which rely on it albeit with some
- * limitations.
+ * limitations. The function doesn't (solely) use ha_random64() because this
+ * secret is permanent, and ha_random64() can easily be leaked at various
+ * places.
  */
 static void generate_random_cluster_secret()
 {
 	/* used as a default random cluster-secret if none defined. */
-	uint64_t rand;
+	union {
+		uint64_t by64[2];
+		uint32_t by32[4];
+		uchar    by8[16];
+	} rand;
 
 	/* The caller must not overwrite an already defined secret. */
 	BUG_ON(cluster_secret_isset);
+	BUG_ON(sizeof(global.cluster_secret) != sizeof(rand));
+
+#ifdef USE_OPENSSL
+	if (RAND_bytes(rand.by8, sizeof(rand.by8)) != 1)
+#endif
+	{
+		/* no SSL or not working, fall back to other sources */
+		rand.by64[0] = ha_random64();
+		rand.by64[1] = ha_random64();
+		rand.by32[0] ^= ((random() & 0x00ffff00) << 8) | ((random() & 0x00ffff00) >> 8);
+		rand.by32[1] ^= ((random() & 0x00ffff00) << 8) | ((random() & 0x00ffff00) >> 8);
+		rand.by32[2] ^= ((random() & 0x00ffff00) << 8) | ((random() & 0x00ffff00) >> 8);
+		rand.by32[3] ^= ((random() & 0x00ffff00) << 8) | ((random() & 0x00ffff00) >> 8);
+	}
 
-	rand = ha_random64();
 	memcpy(global.cluster_secret, &rand, sizeof(rand));
-	rand = ha_random64();
-	memcpy(global.cluster_secret + sizeof(rand), &rand, sizeof(rand));
 	cluster_secret_isset = 1;
 }
 
@@ -3266,6 +3283,105 @@ static void set_identity(const char *program_name)
 #endif
 }
 
+#if defined(CLONE_NEWUSER)
+/* Setup the user namespace after a successful unshare(CLONE_NEWUSER). We do not
+ * return a value because this is best-effort; it is only useful in very rare
+ * situations (see below), and if it fails, we let subsequent setuid() and/or
+ * setgid() calls fail later.
+ */
+static void setup_user_ns(uid_t euid, gid_t egid)
+{
+	char buf[64];
+	int n, ret, fd;
+
+	/* Creating uid_map and gid_map files is required for some specific
+	 * situations where we attempt to setuid()/setgid() to the user/group
+	 * we are already running as after a successful unshare(CLONE_NEWUSER).
+	 * While these directives would effectively be no-ops, we still support
+	 * them because it is possible that such setups exist in the wild. For
+	 * instance, if haproxy is run through a systemd file containing
+	 * "User=someuser" while the configuration file has "user someuser", we
+	 * would be in this situation, and a user enabling "chroot auto" in this
+	 * case would end up with seemingly unrelated setuid() failures.
+	 *
+	 * See user_namespaces(7) for more information.
+	 */
+	if (global.uid > 0) {
+		n = snprintf(buf, sizeof(buf), "%u %u 1\n", euid, euid);
+		fd = open("/proc/self/uid_map", O_WRONLY);
+		if (fd == -1)
+			return;
+
+		ret = write(fd, buf, n);
+		close(fd);
+		if (ret != n)
+			return;
+	}
+
+	if (global.gid > 0) {
+		/* In order to write to the gid_map file, we first need to write
+		 * "deny" to the setgroups file. We allow for failure because
+		 * older kernels do not support the setgroups file.
+		 */
+		fd = open("/proc/self/setgroups", O_WRONLY);
+		if (fd != -1) {
+			ret = write(fd, "deny", 4);
+			close(fd);
+			if (ret != 4)
+				return;
+		}
+
+		n = snprintf(buf, sizeof(buf), "%u %u 1\n", egid, egid);
+		fd = open("/proc/self/gid_map", O_WRONLY);
+		if (fd == -1)
+			return;
+
+		ret = write(fd, buf, n);
+		close(fd);
+		if (ret != n)
+			return;
+	}
+}
+#endif
+
+static int do_chroot(const char *prog, const char *path)
+{
+	const char *chroot_dir = path;
+	int error = 0;
+
+	if (strcmp(path, "auto") == 0) {
+		/* When "chroot auto" is used, we attempt to chroot to an
+		 * anonymous and read-only directory.
+		 */
+		char tmpdir[] = "/tmp/haproxy.XXXXXX";
+		chroot_dir = mkdtemp(tmpdir);
+		if (chroot_dir == NULL) {
+			ha_alert("[%s.main()] Cannot create(%s) for chroot auto.\n",
+			         prog, tmpdir);
+			return -1;
+		}
+		error = chdir(tmpdir);
+		/* We can call rmdir() here; we hold a reference to the
+		 * directory since it is our CWD (and if chdir() failed we still
+		 * want to remove the directory).
+		 */
+		DISGUISE(rmdir(tmpdir));
+		if (!error)
+			error = chroot(".");
+	} else if (strcmp(path, "/") != 0) {
+		error = chroot(path);
+	}
+	if (!error)
+		error = chdir("/");
+
+	if (error) {
+		ha_alert("[%s.main()] Cannot chroot(%s).\n", prog, chroot_dir);
+		return -1;
+	}
+
+	return 0;
+}
+
 int main(int argc, char **argv)
 {
 	struct rlimit limit;
@@ -3582,16 +3698,48 @@ int main(int argc, char **argv)
 		}
 	}
 
+	/* privileged users should use chroot whenever possible; use chroot /
+	 * if really not wanted.
+	 */
+
+	if (!global.chroot) {
+		int chroot_permitted = geteuid() == 0;
+
+#if defined(USE_PRCTL) && defined(PR_CAPBSET_READ) && defined(CAP_SYS_CHROOT)
+		chroot_permitted &= (prctl(PR_CAPBSET_READ, CAP_SYS_CHROOT, 0, 0, 0) == 1);
+#endif
+		if (chroot_permitted) {
+			ha_warning("[%s.main()] HAProxy was started as root without any 'chroot' "
+				   "directive. A chroot limits filesystem access of an intruder "
+				   "to a single, preferably empty, directory. It is strongly recommended "
+				   "to enable this feature whenever possible (it's always possible when "
+				   "starting as root), via 'chroot auto' in the global section. If you "
+				   "think you have good reasons for running outside a chroot, explicitly "
+				   "configure 'chroot /' to silence this warning.\n", argv[0]);
+		}
+	}
+
+#ifdef CLONE_NEWUSER
+	/* When we aren't root and intend to chroot, we try the Linux-only
+	 * unshare(CLONE_NEWUSER) mechanism if available to allow chroot as an
+	 * unprivileged user. If that doesn't work, we just let the subsequent
+	 * chroot() fail as it would have previously.
+	 */
+	if (geteuid() != 0 && global.chroot != NULL) {
+		uid_t euid = geteuid();
+		gid_t egid = getegid();
+		if (unshare(CLONE_NEWUSER) == 0)
+			setup_user_ns(euid, egid);
+	}
+#endif
+
 	/* Must chroot and setgid/setuid in the children */
 	/* chroot if needed */
-	if (global.chroot != NULL) {
+	if (global.chroot != NULL && do_chroot(argv[0], global.chroot) != 0) {
-		if (chroot(global.chroot) == -1 || chdir("/") == -1) {
+		if (nb_oldpids)
-			ha_alert("[%s.main()] Cannot chroot(%s).\n", argv[0], global.chroot);
+			tell_old_pids(SIGTTIN);
-			if (nb_oldpids)
+		protocol_unbind_all();
-				tell_old_pids(SIGTTIN);
+		exit(1);
-			protocol_unbind_all();
-			exit(1);
-		}
 	}
 
 	ha_free(&global.chroot);

src/haterm.c

@@ -12,7 +12,7 @@
 #include <haproxy/istbuf.h>
 #include <haproxy/pipe.h>
 #include <haproxy/pool.h>
-#include <haproxy/proxy-t.h>
+#include <haproxy/proxy.h>
 #include <haproxy/sc_strm.h>
 #include <haproxy/stconn-t.h>
 #include <haproxy/stream.h>
@@ -788,7 +788,7 @@ static void hstream_parse_uri(struct ist uri, struct hstream *hs)
 				} while (*next);
 
 				if (use_rand)
-					result = ((long long)ha_random64() * result) / ((long long)RAND_MAX + 1);
+					result = ((long long)statistical_prng() * result) / 0xFFFFFFFFU;
 
 				switch (*arg) {
 				case 's':
@@ -1223,11 +1223,22 @@ static int hstream_build_responses(void)
 #if defined(USE_LINUX_SPLICE)
 static void hstream_init_splicing(void)
 {
+	struct proxy *px;
 	unsigned int pipesize = 65536;
+	int haterm_used = 0;
 
 	if (!(global.tune.options & GTUNE_USE_SPLICE) || !global.maxpipes)
 		return;
 
+	for (px = proxies_list; px; px = px->next) {
+		if ((px->cap & PR_CAP_FE) && !(px->flags & PR_FL_DISABLED) && px->stream_new_from_sc == hstream_new) {
+			haterm_used = 1;
+			break;
+		}
+	}
+	if (!haterm_used)
+		return;
+
 	if (global.tune.pipesize)
 		pipesize = global.tune.pipesize;
 
@@ -1257,7 +1268,7 @@ static void hstream_init_splicing(void)
 				master_pipesize = 0;
 			}
 			else
-				ha_warning("Splicing in haterm is limited to %lu bytes (too old kernel)\n", (ulong)master_pipesize);
+				ha_warning("Splicing in haterm is limited to %lu bytes\n", (ulong)master_pipesize);
 		}
 	}
 	else

src/hlua.c

@@ -2949,20 +2949,20 @@ __LJMP static int hlua_socket_receive_yield(struct lua_State *L, int status, lua
 
 		/* remove final \r\n. */
 		if (nblk == 1) {
-			if (blk1[len1-1] == '\n') {
+			if (len1 && blk1[len1-1] == '\n') {
 				len1--;
 				skip_at_end++;
-				if (blk1[len1-1] == '\r') {
+				if (len1 && blk1[len1-1] == '\r') {
 					len1--;
 					skip_at_end++;
 				}
 			}
 		}
 		else {
-			if (blk2[len2-1] == '\n') {
+			if (len2 && blk2[len2-1] == '\n') {
 				len2--;
 				skip_at_end++;
-				if (blk2[len2-1] == '\r') {
+				if (len2 && blk2[len2-1] == '\r') {
 					len2--;
 					skip_at_end++;
 				}

src/http_client.c

@@ -376,7 +376,7 @@ out:
  * This function tries to destroy the httpclient if it wasn't running.
  * If it was running, stop the client and ask it to autodestroy itself.
  *
- * Once this function is used, all pointer sto the client must be removed
+ * Once this function is used, all pointers to the client must be removed
  *
  */
 void httpclient_stop_and_destroy(struct httpclient *hc)

src/httpclient_cli.c

@@ -91,7 +91,7 @@ void hc_cli_res_end_cb(struct httpclient *hc)
 static int hc_cli_parse(char **args, char *payload, struct appctx *appctx, void *private)
 {
 	struct hcli_svc_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));
-	struct httpclient *hc;
+	struct httpclient *hc = NULL;
 	char *err = NULL;
 	enum http_meth_t meth;
 	char *meth_str;
@@ -159,6 +159,7 @@ static int hc_cli_parse(char **args, char *payload, struct appctx *appctx, void
 
 err:
 	memprintf(&err, "Can't start the HTTP client%s.\n", err ? err : "");
+	httpclient_destroy(hc);
 	return cli_err(appctx, err);
 }
 

src/htx.c

@@ -681,7 +681,7 @@ struct htx_blk *htx_replace_blk_value(struct htx *htx, struct htx_blk *blk,
 	}
 	else { /* Do a defrag first (it is always an expansion) */
 		struct htx_blk tmpblk;
-		struct buffer *chunk = alloc_trash_chunk();
+		struct buffer *chunk = alloc_trash_chunk_sz(n.len + v.len + delta);
 		void *ptr;
 
 		if (!chunk)
@@ -730,17 +730,20 @@ struct htx_blk *htx_replace_blk_value(struct htx *htx, struct htx_blk *blk,
  *  - HTX_XFER_KEEP_SRC_BLKS: source blocks are not removed
  *  - HTX_XFER_PARTIAL_HDRS_COPY: partial headers and trailers part can be xferred
  *  - HTX_XFER_HDRS_ONLY: Only the headers part is xferred
+ *  - HTX_XFER_NO_METADATA: <count> don't include meta-data, only payload
  */
 size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int flags)
 {
 	struct htx_blk *blk, *last_dstblk;
 	size_t ret = 0;
+	size_t meta_sz = (flags & HTX_XFER_NO_METADATA) ? 0 : sizeof(*blk);
 	uint32_t max, last_dstblk_sz;
 	int dst_full = 0;
 
+
 	last_dstblk = NULL;
 	last_dstblk_sz = 0;
-	for (blk = htx_get_head_blk(src); blk && count; blk = htx_get_next_blk(src, blk)) {
+	for (blk = htx_get_head_blk(src); blk && count > meta_sz; blk = htx_get_next_blk(src, blk)) {
 		struct ist v;
 		enum htx_blk_type type;
 		uint32_t sz;
@@ -755,7 +758,10 @@ size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int fla
 		    type != HTX_BLK_HDR && type != HTX_BLK_EOH)
 			break;
 
-		max = htx_get_max_blksz(dst, count);
+		max = htx_free_data_space(dst);
+		if (max  > count - meta_sz)
+			max = count - meta_sz;
+
 		if (!max)
 			break;
 
@@ -771,8 +777,8 @@ size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int fla
 			}
 			last_dstblk = htx_get_tail_blk(dst);
 			last_dstblk_sz = v.len;
-			count -= sizeof(*blk) + v.len;
+			count -= meta_sz + v.len;
-			ret += sizeof(*blk) + v.len;
+			ret += meta_sz + v.len;
 			if (v.len != sz) {
 				dst_full = 1;
 				goto stop;
@@ -793,8 +799,8 @@ size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int fla
 			last_dstblk->info = blk->info;
 			htx_memcpy(htx_get_blk_ptr(dst, last_dstblk), htx_get_blk_ptr(src, blk), sz);
 			last_dstblk_sz = sz;
-			count -= sizeof(*blk) + sz;
+			count -= meta_sz + sz;
-			ret += sizeof(*blk) + sz;
+			ret += meta_sz + sz;
 			break;
 		}
 
@@ -826,7 +832,7 @@ size_t htx_xfer(struct htx *dst, struct htx *src, size_t count, unsigned int fla
 			/* Remove partial headers/trailers from <dst> and rollback on <src> to not remove them later */
 			while (type == HTX_BLK_REQ_SL || type == HTX_BLK_RES_SL || type == HTX_BLK_HDR || type == HTX_BLK_TLR) {
 				BUG_ON(type != htx_get_blk_type(blk));
-				ret -= sizeof(*blk) + htx_get_blksz(blk);
+				ret -= meta_sz + htx_get_blksz(blk);
 				htx_remove_blk(dst, dstblk);
 				dstblk = htx_get_tail_blk(dst);
 				blk = htx_get_prev_blk(src, blk);

src/jwe.c

@@ -448,7 +448,7 @@ static int build_and_check_tag(jwe_enc enc,  struct jwt_item items[JWE_ELT_MAX],
 	int retval = 1;
 	const EVP_MD *hash = NULL;
 	int mac_key_len = 0;
-	uint64_t aad_len = my_htonll(items[JWE_ELT_JOSE].length << 3);
+	uint64_t aad_len = my_htonll((uint64_t)items[JWE_ELT_JOSE].length << 3);
 
 	struct buffer *tag_data = alloc_trash_chunk();
 	struct buffer *hmac = alloc_trash_chunk();

src/jws.c

@@ -54,13 +54,15 @@ static size_t EVP_PKEY_EC_to_pub_jwk(EVP_PKEY *pkey, char *dst, size_t dsize)
 	int ret = 0;
 	const char *crv = NULL;
 
-#if HA_OPENSSL_VERSION_NUMBER > 0x30000000L
+#if HA_OPENSSL_VERSION_NUMBER >= 0x30000000L
 	char curve[32] = {};
 	size_t curvelen;
 	int nid;
 
-	EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_EC_PUB_X, &x);
+	if (EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_EC_PUB_X, &x) == 0)
-	EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_EC_PUB_Y, &y);
+		goto out;
+	if (EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_EC_PUB_Y, &y) == 0)
+		goto out;
 
 	if (EVP_PKEY_get_utf8_string_param(pkey, OSSL_PKEY_PARAM_GROUP_NAME, curve, sizeof(curve), &curvelen) == 0)
 		goto out;
@@ -144,7 +146,7 @@ static size_t EVP_PKEY_RSA_to_pub_jwk(EVP_PKEY *pkey, char *dst, size_t dsize)
 	struct buffer *str_n = NULL, *str_e = NULL;
 	int ret = 0;
 
-#if HA_OPENSSL_VERSION_NUMBER > 0x30000000L
+#if HA_OPENSSL_VERSION_NUMBER >= 0x30000000L
 
 	if ((EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_RSA_N, &n)) == 0)
 		goto out;
@@ -292,7 +294,7 @@ enum jwt_alg EVP_PKEY_to_jws_alg(EVP_PKEY *pkey)
 	enum jwt_alg alg = JWS_ALG_NONE;
 
 	if (EVP_PKEY_base_id(pkey) == EVP_PKEY_EC) {
-#if HA_OPENSSL_VERSION_NUMBER > 0x30000000L
+#if HA_OPENSSL_VERSION_NUMBER >= 0x30000000L
 		char curve[32] = {};
 		size_t curvelen;
 		int nid;

src/jwt.c

@@ -324,6 +324,8 @@ static int convert_ecdsa_sig(const struct jwt_ctx *ctx, struct buffer *signature
 	ec_S = BN_bin2bn((unsigned char *)(b_orig(signature) + bignum_len), bignum_len, NULL);
 
 	if (!ec_R || !ec_S) {
+		BN_free(ec_R);
+		BN_free(ec_S);
 		retval = JWT_VRFY_INVALID_TOKEN;
 		goto end;
 	}

src/lb_chash.c

@@ -20,6 +20,7 @@
 #include <haproxy/api.h>
 #include <haproxy/backend.h>
 #include <haproxy/errors.h>
+#include <haproxy/guid.h>
 #include <haproxy/queue.h>
 #include <haproxy/server.h>
 #include <haproxy/tools.h>
@@ -82,6 +83,7 @@ static inline u32 chash_compute_server_key(struct server *s)
 {
 	enum srv_hash_key hash_key = s->hash_key;
 	struct server_inetaddr srv_addr;
+	const char *guid_key = NULL;
 	u32 key;
 
 	/* If hash-key is addr or addr-port then we need the address, but if we
@@ -96,6 +98,11 @@ static inline u32 chash_compute_server_key(struct server *s)
 		}
 		break;
 
+	case SRV_HASH_KEY_GUID:
+		guid_key = guid_get(&s->guid);
+		if (!guid_key)
+			hash_key = SRV_HASH_KEY_ID;
+		break;
 	default:
 		break;
 	}
@@ -121,6 +128,14 @@ static inline u32 chash_compute_server_key(struct server *s)
 		}
 		break;
 
+	case SRV_HASH_KEY_GUID:
+		key = XXH32(guid_key, strlen(guid_key), 0);
+		break;
+
+	case SRV_HASH_KEY_ID32:
+		key = full_hash(htonl(s->puid));
+		break;
+
 	case SRV_HASH_KEY_ID:
 	default:
 		key = s->puid * SRV_EWGHT_RANGE;

src/limits.c

@@ -116,7 +116,7 @@ static int compute_ideal_maxconn()
 {
 	int ssl_sides = !!global.ssl_used_frontend + !!global.ssl_used_backend;
 	int engine_fds = global.ssl_used_async_engines * ssl_sides;
-	int pipes = compute_ideal_maxpipes();
+	int pipes = global.maxpipes ? global.maxpipes : compute_ideal_maxpipes();
 	int remain = MAX(rlim_fd_cur_at_boot, rlim_fd_max_at_boot);
 	int maxconn;
 

src/log.c

@@ -1608,7 +1608,7 @@ struct logger *dup_logger(struct logger *def)
 			goto error;
 	}
 	if (def->lb.smp_rgs) {
-		cpy->lb.smp_rgs = malloc(sizeof(*cpy->lb.smp_rgs) * def->lb.smp_rgs_sz);
+		cpy->lb.smp_rgs = malloc(array_size_or_fail(sizeof(*cpy->lb.smp_rgs), def->lb.smp_rgs_sz));
 		if (!cpy->lb.smp_rgs)
 			goto error;
 		memcpy(cpy->lb.smp_rgs, def->lb.smp_rgs,
@@ -3319,7 +3319,7 @@ struct ist *build_log_header(struct log_header hdr, size_t *nbelem)
 				break;
 			}
 			else if (metadata && metadata[LOG_META_TIME].len >= LOG_ISOTIME_MINLEN) {
-				int month;
+				uint month;
 				char *timestamp = metadata[LOG_META_TIME].ptr;
 
 				/* iso time always begins like this: '1970-01-01T00:00:00' */
@@ -5499,7 +5499,7 @@ void parse_log_message(char *buf, size_t buflen, int *level, int *facility,
 			return;
 		fac_level = 10*fac_level + (*p - '0');
 		p++;
-		if ((p - buf) > buflen)
+		if ((p - buf) >= buflen)
 			return;
 	}
 
@@ -6743,6 +6743,7 @@ int cfg_parse_log_profile(const char *file, int linenum, char **args, int kwm)
 			                     SMP_VAL_FE_LOG_END, &errmsg)) {
 				ha_alert("Parsing [%s:%d]: failed to parse logformat: %s.\n",
 				         file, linenum, errmsg);
+				lf_expr_deinit(target_lf);
 				err_code |= ERR_ALERT | ERR_FATAL;
 				goto out;
 			}

src/mux_fcgi.c

@@ -981,7 +981,7 @@ static inline void fcgi_strm_propagate_term_flags(struct fcgi_conn *fconn, struc
  */
 static void fcgi_strm_destroy(struct fcgi_strm *fstrm)
 {
-	struct connection *conn = fstrm->fconn->conn;
+	struct connection __maybe_unused *conn = fstrm->fconn->conn;
 
 	TRACE_ENTER(FCGI_EV_FSTRM_END, conn, fstrm);
 
@@ -3540,7 +3540,7 @@ static size_t fcgi_strm_parse_trailers(struct fcgi_strm *fstrm, struct h1m *h1m,
 
 static size_t fcgi_strm_parse_response(struct fcgi_strm *fstrm, struct buffer *buf, size_t count)
 {
-	struct fcgi_conn *fconn = fstrm->fconn;
+	struct fcgi_conn __maybe_unused *fconn = fstrm->fconn;
 	struct htx *htx;
 	struct h1m *h1m = &fstrm->h1m;
 	size_t ret, data, total = 0;
@@ -4031,7 +4031,7 @@ static int fcgi_subscribe(struct stconn *sc, int event_type, struct wait_event *
 static int fcgi_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es)
 {
 	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
-	struct fcgi_conn *fconn = fstrm->fconn;
+	struct fcgi_conn __maybe_unused *fconn = fstrm->fconn;
 
 	BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
 	BUG_ON(fstrm->subs && fstrm->subs != es);
@@ -4551,7 +4551,7 @@ static const struct mux_ops mux_fcgi_ops = {
 
 /* this mux registers FCGI proto */
 static struct mux_proto_list mux_proto_fcgi =
-{ .token = IST("fcgi"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BE, .mux = &mux_fcgi_ops };
+{ .mux_proto = IST("fcgi"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BE, .mux = &mux_fcgi_ops };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_fcgi);
 

src/mux_h1.c

@@ -1897,7 +1897,7 @@ static void h1_append_chunk_crlf(struct buffer *buf)
  */
 static void h1_set_tunnel_mode(struct h1s *h1s)
 {
-	struct h1c *h1c = h1s->h1c;
+	struct h1c __maybe_unused *h1c = h1s->h1c;
 
 	h1s->req.state = H1_MSG_TUNNEL;
 	h1s->req.flags &= ~(H1_MF_XFER_LEN|H1_MF_CLEN|H1_MF_CHNK);
@@ -2713,7 +2713,9 @@ static size_t h1_make_headers(struct h1s *h1s, struct h1m *h1m, struct htx *htx,
 					goto nextblk;
 			}
 			else if (isteq(n, ist("upgrade"))) {
-				h1_parse_upgrade_header(h1m, v);
+				h1_parse_upgrade_header(h1m, &v);
+				if (!v.len)
+					goto nextblk;
 			}
 			else if ((isteq(n, ist("sec-websocket-accept")) && h1m->flags & H1_MF_RESP) ||
 				 (isteq(n, ist("sec-websocket-key")) && !(h1m->flags & H1_MF_RESP))) {
@@ -6123,9 +6125,9 @@ static const struct mux_ops mux_h1_ops = {
 
 /* this mux registers default HTX proto but also h1 proto (to be referenced in the conf */
 static struct mux_proto_list mux_proto_h1 =
-	{ .token = IST("h1"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &mux_h1_ops };
+	{ .mux_proto = IST("h1"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &mux_h1_ops };
 static struct mux_proto_list mux_proto_http =
-	{ .token = IST(""), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &mux_http_ops,  .alpn = "\010http/1.1" };
+	{ .mux_proto = IST(""), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &mux_http_ops,  .alpn = "\010http/1.1" };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h1);
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_http);

src/mux_h2.c

@@ -1281,7 +1281,7 @@ void _h2_trace_header(const struct ist hn, const struct ist hv,
 		      const struct h2c *h2c, const struct h2s *h2s)
 {
 	struct ist n_ist, v_ist;
-	const char *c_str, *s_str;
+	const char __maybe_unused *c_str, *s_str;
 
 	chunk_reset(&trash);
 	c_str = chunk_newstr(&trash);
@@ -1456,7 +1456,7 @@ static int h2_init(struct connection *conn, struct proxy *prx, struct session *s
 
 		if (max_strm && h2c->streams_hard_limit > max_strm)
 			h2c->streams_limit = h2c->streams_hard_limit = max_strm;
-		if (h2c->streams_hard_limit > 1)
+		if (global.tune.streams_elasticity && h2c->streams_hard_limit > 1)
 			_HA_ATOMIC_ADD(&tg_ctx->committed_extra_streams, h2c->streams_hard_limit - 1);
 	}
 
@@ -1527,7 +1527,10 @@ static int h2_init(struct connection *conn, struct proxy *prx, struct session *s
 	TRACE_LEAVE(H2_EV_H2C_NEW, conn);
 	return 0;
   fail_stream:
-	if (!(h2c->flags & H2_CF_IS_BACK) && h2c->streams_hard_limit > 1)
+	/* Unnecessary code for now as fail_stream only occurs with BE conns.
+	 * Still better though to keep it to prevent future mistakes.
+	 */
+	if (!(h2c->flags & H2_CF_IS_BACK) && global.tune.streams_elasticity && h2c->streams_hard_limit > 1)
 		_HA_ATOMIC_SUB(&tg_ctx->committed_extra_streams, h2c->streams_hard_limit - 1);
 	hpack_dht_free(h2c->ddht);
   fail:
@@ -1607,7 +1610,7 @@ static void h2_release(struct h2c *h2c)
 	if (!conn || !conn_is_reverse(conn))
 		HA_ATOMIC_DEC(&h2c->px_counters->open_conns);
 
-	if (!(h2c->flags & H2_CF_IS_BACK) && h2c->streams_hard_limit > 1)
+	if (!(h2c->flags & H2_CF_IS_BACK) && global.tune.streams_elasticity && h2c->streams_hard_limit > 1)
 		_HA_ATOMIC_SUB(&tg_ctx->committed_extra_streams, h2c->streams_hard_limit - 1);
 
 	pool_free(pool_head_h2_rx_bufs, h2c->shared_rx_bufs);
@@ -2021,7 +2024,7 @@ static inline void h2s_propagate_term_flags(struct h2c *h2c, struct h2s *h2s)
  */
 static void h2s_destroy(struct h2s *h2s)
 {
-	struct connection *conn = h2s->h2c->conn;
+	struct connection __maybe_unused *conn = h2s->h2c->conn;
 	int freed = 0;
 
 	TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
@@ -4197,7 +4200,7 @@ static int h2_conn_reverse(struct h2c *h2c)
 		/* the connection was accounted as frontend streams before
 		 * reversal, we must undo that accounting now.
 		 */
-		if (h2c->streams_hard_limit > 1)
+		if (h2c->streams_hard_limit > 1 && global.tune.streams_elasticity)
 			_HA_ATOMIC_SUB(&tg_ctx->committed_extra_streams, h2c->streams_hard_limit - 1);
 
 		h2c->flags |= H2_CF_IS_BACK;
@@ -4219,7 +4222,7 @@ static int h2_conn_reverse(struct h2c *h2c)
 		struct proxy *prx = l->bind_conf->frontend;
 
 		/* backend connections becoming frontend need accounting. */
-		if (h2c->streams_hard_limit > 1)
+		if (h2c->streams_hard_limit > 1 && global.tune.streams_elasticity)
 			_HA_ATOMIC_ADD(&tg_ctx->committed_extra_streams, h2c->streams_hard_limit - 1);
 
 		h2c->flags &= ~H2_CF_IS_BACK;
@@ -6233,6 +6236,13 @@ next_frame:
 
 	/* Skip StreamDep and weight for now (we don't support PRIORITY) */
 	if (h2c->dff & H2_F_HEADERS_PRIORITY) {
+		if (flen < 5) {
+			h2c_report_glitch(h2c, 1, "too short PRIORITY frame");
+			TRACE_STATE("too short PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
+			h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
+			goto fail;
+		}
+
 		if (read_n32(hdrs) == h2c->dsi) {
 			/* RFC7540#5.3.1 : stream dep may not depend on itself */
 			h2c_report_glitch(h2c, 1, "PRIORITY frame referencing itself");
@@ -6242,13 +6252,6 @@ next_frame:
 			goto fail;
 		}
 
-		if (flen < 5) {
-			h2c_report_glitch(h2c, 1, "too short PRIORITY frame");
-			TRACE_STATE("too short PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
-			h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
-			goto fail;
-		}
-
 		hdrs += 5; // stream dep = 4, weight = 1
 		flen -= 5;
 	}
@@ -7610,7 +7613,7 @@ static size_t h2s_make_data(struct h2s *h2s, struct buffer *buf, size_t count)
  */
 static size_t h2s_skip_data(struct h2s *h2s, struct buffer *buf, size_t count)
 {
-	struct h2c *h2c = h2s->h2c;
+	struct h2c __maybe_unused *h2c = h2s->h2c;
 	struct htx *htx;
 	int bsize; /* htx block size */
 	int fsize; /* h2 frame size  */
@@ -9010,7 +9013,7 @@ static const struct mux_ops h2_ops = {
 };
 
 static struct mux_proto_list mux_proto_h2 =
-	{ .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops,  .alpn = "\002h2" };
+	{ .mux_proto = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops,  .alpn = "\002h2" };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
 

src/mux_pt.c

@@ -936,9 +936,9 @@ const struct mux_ops mux_pt_ops = {
 
 /* PROT selection : default mux has empty name */
 static struct mux_proto_list mux_proto_none =
-	{ .token = IST("none"), .mode = PROTO_MODE_TCP, .side = PROTO_SIDE_BOTH, .mux = &mux_pt_ops };
+	{ .mux_proto = IST("none"), .mode = PROTO_MODE_TCP, .side = PROTO_SIDE_BOTH, .mux = &mux_pt_ops };
 static struct mux_proto_list mux_proto_tcp =
-	{ .token = IST(""), .mode = PROTO_MODE_TCP, .side = PROTO_SIDE_BOTH, .mux = &mux_tcp_ops };
+	{ .mux_proto = IST(""), .mode = PROTO_MODE_TCP, .side = PROTO_SIDE_BOTH, .mux = &mux_tcp_ops };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_none);
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_tcp);

src/mux_quic.c

@@ -2467,6 +2467,7 @@ int qcc_recv_stop_sending(struct qcc *qcc, uint64_t id, uint64_t err)
 static int qcc_release_remote_stream(struct qcc *qcc, uint64_t id)
 {
 	struct quic_frame *frm;
+	uint64_t conn_max, rem, non_extra, inc;
 
 	TRACE_ENTER(QMUX_EV_QCS_END, qcc->conn);
 
@@ -2483,8 +2484,42 @@ static int qcc_release_remote_stream(struct qcc *qcc, uint64_t id)
 		/* MAX_STREAMS needed if closed streams value more than twice
 		 * the initial window or reaching the stream ID limit.
 		 */
-		if (qcc->lfctl.cl_bidi_r > qcc->lfctl.ms_bidi_init / 2 ||
+		if (qcc->lfctl.cl_bidi_r > qcc->lfctl.ms_bidi_rel / 2 ||
 		    qcc->lfctl.cl_bidi_r + qcc->lfctl.ms_bidi == max) {
+
+			BUG_ON(qcc->lfctl.ms_bidi_rel < qcc->lfctl.cl_bidi_r);
+			rem = qcc->lfctl.ms_bidi_rel - qcc->lfctl.cl_bidi_r;
+			/* if every streams are closed, decrement extra stream accounting by 1 */
+			non_extra = !rem ? 1 : 0;
+
+			if (!(qcc->flags & QC_CF_IS_BACK) && global.tune.streams_elasticity) {
+				/* If stream elasticity is active, first decrement closed from extra streams. */
+				if (qcc->lfctl.ms_bidi_rel > 1) {
+					_HA_ATOMIC_SUB(&tg_ctx->committed_extra_streams,
+					               qcc->lfctl.cl_bidi_r - non_extra);
+				}
+
+				/* Now calculate the available streams. */
+				conn_max = conn_calc_max_streams(qcc->lfctl.ms_bidi_init);
+				if (conn_max <= rem) {
+					/* More streams already consumed than currently allowed,
+					 * keep the current flow control limit.
+					 */
+					qcc->lfctl.ms_bidi_rel = rem;
+					qcc->lfctl.cl_bidi_r = 0;
+					goto out;
+				}
+
+				/* Update flow control limit up to the allowed elasticity limit. */
+				inc = conn_max - rem;
+				_HA_ATOMIC_ADD(&tg_ctx->committed_extra_streams, inc - non_extra);
+				qcc->lfctl.ms_bidi_rel = rem + inc;
+			}
+			else {
+				/* Stream elasticity not active, flow control increase remains static. */
+				inc = qcc->lfctl.cl_bidi_r;
+			}
+
 			TRACE_DATA("increase max stream limit with MAX_STREAMS_BIDI", QMUX_EV_QCC_SEND, qcc->conn);
 			frm = qc_frm_alloc(QUIC_FT_MAX_STREAMS_BIDI);
 			if (!frm) {
@@ -2493,12 +2528,11 @@ static int qcc_release_remote_stream(struct qcc *qcc, uint64_t id)
 				goto err;
 			}
 
-			frm->max_streams_bidi.max_streams = qcc->lfctl.ms_bidi +
+			frm->max_streams_bidi.max_streams = qcc->lfctl.ms_bidi + inc;
-			                                    qcc->lfctl.cl_bidi_r;
 			LIST_APPEND(&qcc->lfctl.frms, &frm->list);
 			tasklet_wakeup(qcc->wait_event.tasklet);
 
-			qcc->lfctl.ms_bidi += qcc->lfctl.cl_bidi_r;
+			qcc->lfctl.ms_bidi += inc;
 			qcc->lfctl.cl_bidi_r = 0;
 		}
 	}
@@ -3307,6 +3341,10 @@ static int qcm_avail_streams(struct connection *conn)
 
 	ret = qcc_fctl_avail_streams(qcc, 1);
 
+	/* Enforce stream_max_concurrent limit even if peer allows more streams. */
+	if (ret > quic_tune.be.stream_max_concurrent - qcc->nb_hreq)
+		ret = quic_tune.be.stream_max_concurrent - qcc->nb_hreq;
+
 	/* Now cap return value if reaching max-reuse server or maximum stream
 	 * ID. qcc_be_is_reusable() already detected if one of these has been
 	 * exceeded.
@@ -3586,6 +3624,12 @@ static void qcc_release(struct qcc *qcc)
 	}
 	TRACE_PROTO("application layer released", QMUX_EV_QCC_END, conn);
 
+	if (!(qcc->flags & QC_CF_IS_BACK) && global.tune.streams_elasticity &&
+	    qcc->lfctl.ms_bidi_rel > 1) {
+		_HA_ATOMIC_SUB(&tg_ctx->committed_extra_streams,
+		               qcc->lfctl.ms_bidi_rel - 1);
+	}
+
 	if (conn && !conn_is_quic(conn)) {
 		b_free(&qcc->rx.qmux_buf);
 		b_free(&qcc->tx.qmux_buf);
@@ -3849,7 +3893,7 @@ static int qcm_init(struct connection *conn, struct proxy *prx,
 		/* Server parameters, params used for RX flow control. */
 		lparams = &conn->handle.qc->rx.params;
 
-		qcc->lfctl.ms_bidi = qcc->lfctl.ms_bidi_init = lparams->initial_max_streams_bidi;
+		qcc->lfctl.ms_bidi = qcc->lfctl.ms_bidi_init = qcc->lfctl.ms_bidi_rel = lparams->initial_max_streams_bidi;
 		qcc->lfctl.ms_uni = lparams->initial_max_streams_uni;
 		qcc->lfctl.msd_bidi_l = lparams->initial_max_stream_data_bidi_local;
 		qcc->lfctl.msd_bidi_r = lparams->initial_max_stream_data_bidi_remote;
@@ -3878,7 +3922,7 @@ static int qcm_init(struct connection *conn, struct proxy *prx,
 		qcc->rfctl.msd_uni_l = rparams->initial_max_stream_data_uni;
 
 		lparams = xprt_qmux_lparams(conn->xprt_ctx);
-		qcc->lfctl.ms_bidi = qcc->lfctl.ms_bidi_init = lparams->initial_max_streams_bidi;
+		qcc->lfctl.ms_bidi = qcc->lfctl.ms_bidi_init = qcc->lfctl.ms_bidi_rel= lparams->initial_max_streams_bidi;
 		qcc->lfctl.ms_uni = lparams->initial_max_streams_uni;
 		qcc->lfctl.msd_bidi_l = lparams->initial_max_stream_data_bidi_local;
 		qcc->lfctl.msd_bidi_r = lparams->initial_max_stream_data_bidi_remote;
@@ -3928,6 +3972,11 @@ static int qcm_init(struct connection *conn, struct proxy *prx,
 		qcc->next_bidi_l    = 0x01;
 		qcc->largest_uni_r  = 0x02;
 		qcc->next_uni_l     = 0x03;
+
+		if (global.tune.streams_elasticity && qcc->lfctl.ms_bidi_init > 1) {
+			_HA_ATOMIC_ADD(&tg_ctx->committed_extra_streams,
+			               qcc->lfctl.ms_bidi_init - 1);
+		}
 	}
 
 	qcc->wait_event.tasklet = tasklet_new();
@@ -4154,6 +4203,10 @@ static void qcm_strm_detach(struct sedesc *sd)
 		qcs->flags |= QC_SF_DETACH;
 		qcc_refresh_timeout(qcc);
 
+		/* TODO on backend side if a QCS is detached, the connection may
+		 * not be reinserted in the correct server pool (idle or avail).
+		 */
+
 		TRACE_LEAVE(QMUX_EV_STRM_END, qcc->conn, qcs);
 		return;
 	}
@@ -4637,7 +4690,7 @@ static int qcm_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *out
 		return qcc->nb_hreq;
 
 	case MUX_CTL_GET_MAXSTRM:
-		return qcc->lfctl.ms_bidi_init;
+		return qcc->lfctl.ms_bidi_rel;
 
 	case MUX_CTL_TEVTS:
 		return qcc->term_evts_log;
@@ -4784,7 +4837,7 @@ void qcc_show_quic(struct qcc *qcc)
 }
 
 static struct mux_proto_list mux_proto_quic =
-  { .token = IST("quic"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &quic_ops };
+  { .mux_proto = IST("quic"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &quic_ops };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_quic);
 
@@ -4813,6 +4866,7 @@ static const struct mux_ops qmux_ops = {
 };
 
 static struct mux_proto_list mux_proto_qmux =
-  { .token = IST("qmux"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &qmux_ops };
+  { .mux_proto = IST("qmux"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &qmux_ops,
+    .alpn = "\002h3", .init_xprt = XPRT_QMUX };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_qmux);

src/mux_spop.c

@@ -1154,7 +1154,7 @@ static inline void spop_strm_propagate_term_flags(struct spop_conn *spop_conn, s
  */
 static void spop_strm_destroy(struct spop_strm *spop_strm)
 {
-	struct connection *conn = spop_strm->spop_conn->conn;
+	struct connection __maybe_unused *conn = spop_strm->spop_conn->conn;
 
 	TRACE_ENTER(SPOP_EV_SPOP_STRM_END, conn, spop_strm);
 
@@ -3199,7 +3199,7 @@ static int spop_subscribe(struct stconn *sc, int event_type, struct wait_event *
 static int spop_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es)
 {
 	struct spop_strm *spop_strm = __sc_mux_strm(sc);
-	struct spop_conn *spop_conn = spop_strm->spop_conn;
+	struct spop_conn __maybe_unused *spop_conn = spop_strm->spop_conn;
 
 	BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
 	BUG_ON(spop_strm->subs && spop_strm->subs != es);
@@ -3738,10 +3738,10 @@ static const struct mux_ops mux_spop_ops = {
 };
 
 static struct mux_proto_list mux_proto_spop =
-	{ .token = IST("spop"), .mode = PROTO_MODE_SPOP, .side = PROTO_SIDE_BE, .mux = &mux_spop_ops };
+	{ .mux_proto = IST("spop"), .mode = PROTO_MODE_SPOP, .side = PROTO_SIDE_BE, .mux = &mux_spop_ops };
 
 static struct mux_proto_list mux_proto_default_spop =
-	{ .token = IST(""), .mode = PROTO_MODE_SPOP, .side = PROTO_SIDE_BE, .mux = &mux_spop_ops };
+	{ .mux_proto = IST(""), .mode = PROTO_MODE_SPOP, .side = PROTO_SIDE_BE, .mux = &mux_spop_ops };
 
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_spop);
 INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_default_spop);

src/net_helper.c

@@ -447,8 +447,8 @@ static size_t tcp_fullhdr_find_opt(const struct sample *smp, uint8_t opt)
 		/* kind1 = NOP and is a single byte, others have a length field */
 		if (smp->data.u.str.area[next] == 1)
 			next++;
-		else if (next + 1 < len)
+		else if (next + 1 < len && smp->data.u.str.area[next + 1] > 1)
-			next += smp->data.u.str.area[next + 1];
+			next += (uchar)smp->data.u.str.area[next + 1];
 		else
 			break;
 		if (smp->data.u.str.area[curr] == opt && next <= len)
@@ -605,7 +605,7 @@ static int sample_conv_tcp_options_list(const struct arg *arg_p, struct sample *
 		/* kind1 = NOP and is a single byte, others have a length field */
 		if (smp->data.u.str.area[ofs] == 1)
 			ofs++;
-		else if (ofs + 1 < len && smp->data.u.str.area[ofs + 1])
+		else if (ofs + 1 < len && smp->data.u.str.area[ofs + 1] > 1)
 			ofs += (uchar)smp->data.u.str.area[ofs + 1];
 		else
 			break;
@@ -780,7 +780,7 @@ static int sample_conv_ip_fp(const struct arg *arg_p, struct sample *smp, void *
 		/* kind1 = NOP and is a single byte, others have a length field */
 		if (smp->data.u.str.area[ofs] == 1)
 			next = ofs + 1;
-		else if ((ofs + 1 < tcplen) && smp->data.u.str.area[ofs + 1]) /* optlen 0 will cause an infinite loop */
+		else if ((ofs + 1 < tcplen) && smp->data.u.str.area[ofs + 1] > 1)
 			next = ofs + (uchar)smp->data.u.str.area[ofs + 1];
 		else
 			break;

src/proto_rhttp.c

@@ -371,7 +371,7 @@ int rhttp_bind_listener(struct listener *listener, char *errmsg, int errlen)
 	}
 
 	/* Check that server uses HTTP/2 either with proto or ALPN. */
-	if ((!srv->mux_proto || !isteqi(srv->mux_proto->token, ist("h2"))) &&
+	if ((!srv->mux_proto || !isteqi(srv->mux_proto->mux_proto, ist("h2"))) &&
 	    (!srv->use_ssl || !isteqi(ist(srv->ssl_ctx.alpn_str), ist("\x02h2")))) {
 		snprintf(errmsg, errlen, "Cannot reverse connect with server '%s/%s' unless HTTP/2 is activated on it with either proto or alpn keyword.", name, ist0(sv_name));
 		goto err;

src/proxy.c

@@ -69,7 +69,7 @@
 #include <haproxy/uri_auth.h>
 
 /* Lock to ensure multiple backends deletion concurrently is safe */
-static __decl_spinlock(proxies_del_lock);
+__decl_spinlock(proxies_del_lock);
 
 int listeners;	/* # of proxy listeners, set by cfgparse */
 struct proxy *proxies_list  = NULL;     /* list of main proxies */
@@ -903,7 +903,7 @@ static int proxy_parse_declare(char **args, int section, struct proxy *curpx,
 		len = strtol(args[4], &error, 10);
 		if (*error != '\0') {
 			memprintf(err, "'%s %s': cannot parse the length '%s'.",
-			          args[0], args[1], args[3]);
+			          args[0], args[1], args[4]);
 			return -1;
 		}
 
@@ -1006,7 +1006,7 @@ proxy_parse_retry_on(char **args, int section, struct proxy *curpx,
 					     PR_RE_JUNK_REQUEST;
 		else if (strcmp(args[i], "none") == 0) {
 			if (i != 1 || *args[i + 1]) {
-				memprintf(err, "'%s' 'none' keyworld only usable alone", args[0]);
+				memprintf(err, "'%s' 'none' keyword only usable alone", args[0]);
 				return -1;
 			}
 		} else {
@@ -1689,13 +1689,13 @@ int proxy_finalize(struct proxy *px, int *err_code)
 			 * due to the proxy's mode not being taken into account
 			 * on first pass. Let's adjust it now.
 			 */
-			mux_ent = conn_get_best_mux_entry(bind_conf->mux_proto->token, PROTO_SIDE_FE, is_quic, mode);
+			mux_ent = conn_get_best_mux_entry(bind_conf->mux_proto->mux_proto, IST_NULL, PROTO_SIDE_FE, is_quic, mode);
 
-			if (!mux_ent || !isteq(mux_ent->token, bind_conf->mux_proto->token)) {
+			if (!mux_ent || !isteq(mux_ent->mux_proto, bind_conf->mux_proto->mux_proto)) {
 				ha_alert("%s '%s' : MUX protocol '%.*s' is not usable for 'bind %s' at [%s:%d].\n",
 				         proxy_type_str(px), px->id,
-				         (int)bind_conf->mux_proto->token.len,
+				         (int)bind_conf->mux_proto->mux_proto.len,
-				         bind_conf->mux_proto->token.ptr,
+				         bind_conf->mux_proto->mux_proto.ptr,
 				         bind_conf->arg, bind_conf->file, bind_conf->line);
 				cfgerr++;
 			}
@@ -1703,16 +1703,16 @@ int proxy_finalize(struct proxy *px, int *err_code)
 				if ((mux_ent->mux->flags & MX_FL_FRAMED) && !(bind_conf->options & BC_O_USE_SOCK_DGRAM)) {
 					ha_alert("%s '%s' : frame-based MUX protocol '%.*s' is incompatible with stream transport of 'bind %s' at [%s:%d].\n",
 					         proxy_type_str(px), px->id,
-					         (int)bind_conf->mux_proto->token.len,
+					         (int)bind_conf->mux_proto->mux_proto.len,
-					         bind_conf->mux_proto->token.ptr,
+					         bind_conf->mux_proto->mux_proto.ptr,
 					         bind_conf->arg, bind_conf->file, bind_conf->line);
 					cfgerr++;
 				}
 				else if (!(mux_ent->mux->flags & MX_FL_FRAMED) && !(bind_conf->options & BC_O_USE_SOCK_STREAM)) {
 					ha_alert("%s '%s' : stream-based MUX protocol '%.*s' is incompatible with framed transport of 'bind %s' at [%s:%d].\n",
 					         proxy_type_str(px), px->id,
-					         (int)bind_conf->mux_proto->token.len,
+					         (int)bind_conf->mux_proto->mux_proto.len,
-					         bind_conf->mux_proto->token.ptr,
+					         bind_conf->mux_proto->mux_proto.ptr,
 					         bind_conf->arg, bind_conf->file, bind_conf->line);
 					cfgerr++;
 				}
@@ -1778,6 +1778,22 @@ int proxy_finalize(struct proxy *px, int *err_code)
 			}
 #endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */
 		} /* HTTP && bufsize < 16384 */
+
+#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
+		if (px->mode == PR_MODE_HTTP && !bind_conf->mux_proto &&
+		    bind_conf->ssl_conf.alpn_str &&
+		    strstr(bind_conf->ssl_conf.alpn_str, "\002h3")) {
+			if (!experimental_directives_allowed) {
+				ha_alert("HTTP/3 on TCP listed via ALPN on frontend '%s' at [%s:%d] relies on the experimental QMux protocol, "
+				         "must be allowed via a global 'expose-experimental-directives'.\n",
+				         px->id, bind_conf->file, bind_conf->line);
+				cfgerr++;
+			}
+
+			mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
+		}
+#endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */
+
 #endif /* USE_OPENSSL */
 
 #ifdef USE_QUIC
@@ -1792,6 +1808,13 @@ int proxy_finalize(struct proxy *px, int *err_code)
 				           proxy_type_str(px), px->id);
 				*err_code |= ERR_WARN;
 			}
+
+			if (bind_conf->ssl_conf.early_data && conn_calc_max_streams(1)) {
+				ha_notice("Binding [%s:%d] for %s %s: "
+				          "stream elasticity is ignored for initial connection settings as this is incompatible with 0-RTT.",
+				           bind_conf->file, bind_conf->line,
+				           proxy_type_str(px), px->id);
+			}
 		}
 #endif /* USE_QUIC */
 
@@ -2849,13 +2872,13 @@ int proxy_finalize(struct proxy *px, int *err_code)
 		 * due to the proxy's mode not being taken into account
 		 * on first pass. Let's adjust it now.
 		 */
-		mux_ent = conn_get_best_mux_entry(newsrv->mux_proto->token, PROTO_SIDE_BE, srv_is_quic(newsrv), mode);
+		mux_ent = conn_get_best_mux_entry(newsrv->mux_proto->mux_proto, IST_NULL, PROTO_SIDE_BE, srv_is_quic(newsrv), mode);
 
-		if (!mux_ent || !isteq(mux_ent->token, newsrv->mux_proto->token)) {
+		if (!mux_ent || !isteq(mux_ent->mux_proto, newsrv->mux_proto->mux_proto)) {
 			ha_alert("%s '%s' : MUX protocol '%.*s' is not usable for server '%s' at [%s:%d].\n",
 			         proxy_type_str(px), px->id,
-			         (int)newsrv->mux_proto->token.len,
+			         (int)newsrv->mux_proto->mux_proto.len,
-			         newsrv->mux_proto->token.ptr,
+			         newsrv->mux_proto->mux_proto.ptr,
 			         newsrv->id, newsrv->conf.file, newsrv->conf.line);
 			cfgerr++;
 		}
@@ -2863,16 +2886,16 @@ int proxy_finalize(struct proxy *px, int *err_code)
 			if ((mux_ent->mux->flags & MX_FL_FRAMED) && !srv_is_quic(newsrv)) {
 				ha_alert("%s '%s' : MUX protocol '%.*s' is incompatible with stream transport used by server '%s' at [%s:%d].\n",
 				         proxy_type_str(px), px->id,
-				         (int)newsrv->mux_proto->token.len,
+				         (int)newsrv->mux_proto->mux_proto.len,
-				         newsrv->mux_proto->token.ptr,
+				         newsrv->mux_proto->mux_proto.ptr,
 				         newsrv->id, newsrv->conf.file, newsrv->conf.line);
 				cfgerr++;
 			}
 			else if (!(mux_ent->mux->flags & MX_FL_FRAMED) && srv_is_quic(newsrv)) {
 				ha_alert("%s '%s' : MUX protocol '%.*s' is incompatible with framed transport used by server '%s' at [%s:%d].\n",
 				         proxy_type_str(px), px->id,
-				         (int)newsrv->mux_proto->token.len,
+				         (int)newsrv->mux_proto->mux_proto.len,
-				         newsrv->mux_proto->token.ptr,
+				         newsrv->mux_proto->mux_proto.ptr,
 				         newsrv->id, newsrv->conf.file, newsrv->conf.line);
 				cfgerr++;
 			}
@@ -3562,7 +3585,7 @@ struct proxy *parse_new_proxy(const char *name, unsigned int cap,
 			ha_alert("parsing [%s:%d] : %s\n", file, linenum, errmsg);
 			free(errmsg);
 
-			ha_free(&curproxy);
+			proxy_drop(curproxy);
 			return NULL;
 		}
 	}
@@ -5443,8 +5466,8 @@ static int cli_io_handler_show_errors(struct appctx *appctx)
 
 /* register cli keywords */
 static struct cli_kw_list cli_kws = {{ },{
-	{ { "add", "backend", NULL },                       "add backend <backend>                   : add a new backend",                                              cli_parse_add_backend, NULL, NULL, NULL, ACCESS_EXPERIMENTAL },
+	{ { "add", "backend", NULL },                       "add backend <backend>                   : add a new backend",                                              cli_parse_add_backend, NULL, NULL, NULL, 0 },
-	{ { "del", "backend", NULL },                       "del backend <backend>                   : delete a backend",                                               cli_parse_delete_backend, NULL, NULL, NULL, ACCESS_EXPERIMENTAL },
+	{ { "del", "backend", NULL },                       "del backend <backend>                   : delete a backend",                                               cli_parse_delete_backend, NULL, NULL, NULL, 0 },
 	{ { "disable", "frontend",  NULL },                 "disable frontend <frontend>             : temporarily disable specific frontend",                          cli_parse_disable_frontend, NULL, NULL },
 	{ { "enable", "frontend",  NULL },                  "enable frontend <frontend>              : re-enable specific frontend",                                    cli_parse_enable_frontend, NULL, NULL },
 	{ { "publish", "backend",  NULL },                  "publish backend <backend>               : mark backend as ready for traffic",                              cli_parse_publish_backend, NULL, NULL },

src/qcm_qmux.c

@@ -70,6 +70,10 @@ static int qmux_parse_frm(struct qcc *qcc, struct buffer *buf)
 		struct qf_reset_stream *rst_frm = &frm.reset_stream;
 		qcc_recv_reset_stream(qcc, rst_frm->id, rst_frm->app_error_code, rst_frm->final_size);
 	}
+	else if (frm.type == QUIC_FT_STOP_SENDING) {
+		struct qf_stop_sending *ss_frm = &frm.stop_sending;
+		qcc_recv_stop_sending(qcc, ss_frm->id, ss_frm->app_error_code);
+	}
 	else if (frm.type == QUIC_FT_MAX_DATA) {
 		struct qf_max_data *md_frm = &frm.max_data;
 		qcc_recv_max_data(qcc, md_frm->max_data);
@@ -82,13 +86,26 @@ static int qmux_parse_frm(struct qcc *qcc, struct buffer *buf)
 		struct qf_max_streams *ms_frm = &frm.max_streams_bidi;
 		qcc_recv_max_streams(qcc, ms_frm->max_streams, 1);
 	}
+	else if (frm.type == QUIC_FT_MAX_STREAMS_UNI) {
+		struct qf_max_streams *ms_frm = &frm.max_streams_uni;
+		qcc_recv_max_streams(qcc, ms_frm->max_streams, 0);
+	}
 	else if (frm.type == QUIC_FT_DATA_BLOCKED ||
 	         frm.type == QUIC_FT_STREAM_DATA_BLOCKED ||
 	         frm.type == QUIC_FT_STREAMS_BLOCKED_BIDI ||
 	         frm.type == QUIC_FT_STREAMS_BLOCKED_UNI) {
 	        /* TODO */
+		CHECK_IF("received flow control blocked frame not yet handled in QMux");
+	}
+	else if (frm.type == QUIC_FT_PADDING) {
+		CHECK_IF("received padding frame not yet handled in QMux");
+	}
+	else if (frm.type == QUIC_FT_CONNECTION_CLOSE ||
+	         frm.type == QUIC_FT_CONNECTION_CLOSE_APP) {
+		CHECK_IF("received connection_close frame not yet handled in QMux");
 	}
 	else {
+		/* qmux_is_frm_valid() must prevent this */
 		ABORT_NOW();
 	}
 

src/quic_cid.c

@@ -378,7 +378,7 @@ int quic_get_cid_tid(const unsigned char *cid, size_t cid_len,
 
 		tree = &quic_fe_cid_trees[quic_cid_tree_idx(&derive_cid)];
 		HA_RWLOCK_RDLOCK(QC_CID_LOCK, &tree->lock);
-		node = ebmb_lookup(&tree->root, cid, cid_len);
+		node = ebmb_lookup(&tree->root, derive_cid.data, derive_cid.len);
 		if (node) {
 			conn_id = ebmb_entry(node, struct quic_connection_id, node);
 			cid_tid = HA_ATOMIC_LOAD(&conn_id->tid);

src/quic_ssl.c

@@ -710,7 +710,7 @@ static inline int ha_quic_set_write_secret(SSL *ssl, enum ssl_encryption_level_t
 
 static int ha_quic_flush_flight(SSL *ssl)
 {
-	struct quic_conn *qc = SSL_get_ex_data(ssl, ssl_qc_app_data_index);
+	struct quic_conn __maybe_unused *qc = SSL_get_ex_data(ssl, ssl_qc_app_data_index);
 
 	TRACE_ENTER(QUIC_EV_CONN_FFLIGHT, qc);
 	TRACE_LEAVE(QUIC_EV_CONN_FFLIGHT, qc);

src/quic_tls.c

@@ -1060,7 +1060,7 @@ int quic_tls_key_update(struct quic_conn *qc)
 	struct quic_tls_secrets *rx = &tls_ctx->rx;
 	struct quic_tls_secrets *tx = &tls_ctx->tx;
 	/* Used only for the traces */
-	struct quic_kp_trace kp_trace = {
+	struct quic_kp_trace __maybe_unused kp_trace = {
 		.rx_sec = rx->secret,
 		.rx_seclen = rx->secretlen,
 		.tx_sec = tx->secret,

src/quic_tp.c

@@ -1,6 +1,7 @@
 #include <arpa/inet.h>
 #include <string.h>
 
+#include <haproxy/connection.h>
 #include <haproxy/global.h>
 #include <haproxy/ncbuf-t.h>
 #include <haproxy/net_helper.h>
@@ -70,7 +71,7 @@ void quic_transport_params_init(struct quic_transport_params *p, int server)
 	                               quic_tune.be.max_idle_timeout;
 
 	/* Set limit on number of concurrently opened streams. */
-	p->initial_max_streams_bidi = max_streams_bidi;
+	p->initial_max_streams_bidi = server ? max_streams_bidi : 0;
 	p->initial_max_streams_uni  = max_streams_uni;
 
 	/* Set connection flow-control data limit, either from configuration,
@@ -862,6 +863,15 @@ int qc_lstnr_params_init(struct quic_conn *qc,
 	rx_params->initial_source_connection_id.len = scidlen;
 	TRACE_PROTO("\nRX(local) transp. params.", QUIC_EV_TRANSP_PARAMS, qc, rx_params);
 
+	/* Reduce max-streams-bidi if stream elasticity is active. This is
+	 * ignored however if 0-RTT is configured as clients could reuse
+	 * different transport parameters than the one advertised.
+	 */
+	if (global.tune.streams_elasticity && !qc->li->bind_conf->ssl_conf.early_data) {
+		rx_params->initial_max_streams_bidi =
+		  conn_calc_max_streams(rx_params->initial_max_streams_bidi);
+	}
+
 	return 1;
 }
 

src/regex.c

@@ -444,7 +444,7 @@ INITCALL0(STG_REGISTER, regex_register_build_options);
 #ifdef USE_PCRE2
 static int init_pcre2_per_thread(void)
 {
-	local_pcre2_match = pcre2_match_data_create(MAX_MATCH - 1, NULL);
+	local_pcre2_match = pcre2_match_data_create(MAX_MATCH, NULL);
 	if (!local_pcre2_match) {
 		ha_alert("Failed to allocate PCRE2 match data context for thread %u.\n", tid);
 		return 0;

src/resolvers.c

@@ -226,7 +226,7 @@ struct show_resolvers_ctx {
 };
 
 /* returns the currently accepted address families as a combination of
- * RSLV_ACCEPT_IPV4 and RSLV_ACCEPT_IPV6 only. It will dynamically adapt adapt
+ * RSLV_ACCEPT_IPV4 and RSLV_ACCEPT_IPV6 only. It will dynamically adapt
  * the IPv6 status to sock_inet6_seems_reachable if RSLV_AUTO_FAMILY is set,
  * otherwise returns the relevant bits of resolv_accept_families.
  */
@@ -509,7 +509,7 @@ resolv_run_resolution(struct resolv_resolution *resolution)
 		return 0;
 
 	/* Check if a resolution has already been started for this server return
-	 * directly to avoid resolution pill up. */
+	 * directly to avoid resolution pile up. */
 	if (resolution->step != RSLV_STEP_NONE)
 		return 0;
 
@@ -624,17 +624,21 @@ int resolv_read_name(unsigned char *buffer, unsigned char *bufend,
 
 		/* Name compression is in use */
 		if ((*reader & 0xc0) == 0xc0) {
+			uint16_t ptr_offset;
+
 			if (reader + 1 >= bufend)
 				goto err;
 
+			ptr_offset = (*reader & 0x3f) * 256 + reader[1];
+
 			/* Must point BEFORE current position */
-			if ((buffer + reader[1]) > reader)
+			if ((buffer + ptr_offset) >= reader)
 				goto err;
 
 			if (depth++ > 100)
 				goto err;
 
-			n = resolv_read_name(buffer, bufend, buffer + (*reader & 0x3f)*256 + reader[1],
+			n = resolv_read_name(buffer, bufend, buffer + ptr_offset,
 			                     dest, dest_len - nb_bytes, offset, depth);
 			if (n == 0)
 				goto err;
@@ -1232,8 +1236,7 @@ static int resolv_validate_dns_response(unsigned char *resp, unsigned char *bufe
 		if (reader + 4 > bufend)
 			goto invalid_resp;
 
-		answer_record->ttl =   reader[0] * 16777216 + reader[1] * 65536
+		answer_record->ttl = read_n32(reader);
-		                     + reader[2] * 256 + reader[3];
 		reader += 4;
 
 		/* Now reading data len */
@@ -1430,7 +1433,7 @@ static int resolv_validate_dns_response(unsigned char *resp, unsigned char *bufe
 		len = resolv_read_name(resp, bufend, reader, tmpname, DNS_MAX_NAME_SIZE,
 		                    &offset, 0);
 		if (len == 0)
-			continue;
+			goto invalid_resp;
 
 		if (reader + offset + 10 >= bufend)
 			goto invalid_resp;
@@ -1466,11 +1469,8 @@ static int resolv_validate_dns_response(unsigned char *resp, unsigned char *bufe
 		offset = 0;
 		len = resolv_read_name(resp, bufend, reader, tmpname, DNS_MAX_NAME_SIZE, &offset, 0);
 
-		if (len == 0) {
+		if (len == 0)
-			pool_free(resolv_answer_item_pool, answer_record);
+			goto invalid_resp;
-			answer_record = NULL;
-			continue;
-		}
 
 		memcpy(answer_record->name, tmpname, len);
 		answer_record->name[len] = 0;
@@ -1497,8 +1497,7 @@ static int resolv_validate_dns_response(unsigned char *resp, unsigned char *bufe
 		if (reader + 4 > bufend)
 			goto invalid_resp;
 
-		answer_record->ttl =   reader[0] * 16777216 + reader[1] * 65536
+		answer_record->ttl = read_n32(reader);
-		                     + reader[2] * 256 + reader[3];
 		reader += 4;
 
 		/* Now reading data len */
@@ -1598,7 +1597,6 @@ static int resolv_validate_dns_response(unsigned char *resp, unsigned char *bufe
 				    tmp_record->ar_item == NULL &&
 				    memcmp(tmp_record->data.target, answer_record->name, tmp_record->data_len) == 0) {
 					/* Always use the received additional record to refresh info */
-					pool_free(resolv_answer_item_pool, tmp_record->ar_item);
 					tmp_record->ar_item = answer_record;
 					answer_record = NULL;
 					break;
@@ -1854,7 +1852,15 @@ int resolv_dn_label_to_str(const char *dn, int dn_len, char *str, int str_len)
 
 	ptr = str;
 	for (i = 0; i < dn_len; ++i) {
-		sz = dn[i];
+		sz = (unsigned char)dn[i];
+
+		if (!sz)
+			break;
+
+		/* Check str_len adding 1 for the dot if (i!=0) and 1 for null terminator */
+		if (str_len < sz+i+(!!i)+1)
+			return -1;
+
 		if (i)
 			*ptr++ = '.';
 		/* copy the string at i+1 to lower case */
@@ -2695,6 +2701,7 @@ static void resolvers_destroy(struct resolvers *resolvers)
 			dns_ring_free(ns->stream->ring_req);
 			task_destroy(ns->stream->task_req);
 			task_destroy(ns->stream->task_rsp);
+			task_destroy(ns->stream->task_idle);
 			free(ns->stream);
 		}
 		LIST_DEL_INIT(&ns->list);
@@ -3198,7 +3205,7 @@ enum act_return resolv_action_do_resolve(struct act_rule *rule, struct proxy *px
 			if (resolution->status == RSLV_STATUS_NONE)
 				goto yield;
 			if (resolution->status == RSLV_STATUS_VALID) {
-				struct sample smp;
+				struct sample smp = { 0 };
 				short ip_sin_family = 0;
 				void *ip = NULL;
 
@@ -3404,8 +3411,8 @@ enum act_parse_ret resolv_parse_do_resolve(const char **args, int *orig_arg, str
 	ha_free(&rule->arg.resolv.varname);
 	ha_free(&rule->arg.resolv.resolvers_id);
 	ha_free(&rule->arg.resolv.opts);
-	memprintf(err, "Can't parse '%s'. Expects 'do-resolve(<varname>,<resolvers>[,<options>]) <expr>'. Available options are 'ipv4' and 'ipv6'",
+	memprintf(err, "Can't parse '%s'%s%s. Expects 'do-resolve(<varname>,<resolvers>[,<options>]) <expr>'. Available options are 'ipv4' and 'ipv6'",
-			args[cur_arg]);
+			args[cur_arg], *err ? ": " : "", *err ? *err : "");
 	return ACT_RET_PRS_ERR;
 }
 
@@ -3476,7 +3483,7 @@ static int parse_resolve_conf(char **errmsg, char **warnmsg)
 	int duplicate_name = 0;
 	int err_code = 0;
 
-	if ((resolv_line = malloc(sizeof(*resolv_line) * LINESIZE)) == NULL) {
+	if ((resolv_line = malloc(array_size_or_fail(sizeof(*resolv_line), LINESIZE))) == NULL) {
 		memprintf(errmsg, "out of memory.\n");
 		err_code |= ERR_ALERT | ERR_FATAL;
 		goto resolv_out;
@@ -3568,6 +3575,8 @@ static int parse_resolve_conf(char **errmsg, char **warnmsg)
 			if (errmsg)
 				memprintf(errmsg, "parsing [/etc/resolv.conf:%d] : out of memory.", resolv_linenum);
 			err_code |= ERR_ALERT | ERR_FATAL;
+			dns_ring_free(newnameserver->dgram->ring_req);
+			free(newnameserver->dgram);
 			free(newnameserver);
 			goto resolv_out;
 		}
@@ -3578,6 +3587,8 @@ static int parse_resolve_conf(char **errmsg, char **warnmsg)
 				memprintf(errmsg, "parsing [/etc/resolv.conf:%d] : out of memory.", resolv_linenum);
 			err_code |= ERR_ALERT | ERR_FATAL;
 			free((char *)newnameserver->conf.file);
+			dns_ring_free(newnameserver->dgram->ring_req);
+			free(newnameserver->dgram);
 			free(newnameserver);
 			goto resolv_out;
 		}
@@ -3668,6 +3679,7 @@ err_free_conf_file:
 	ha_free((void **)&r->conf.file);
 err_free_p:
 	proxy_drop(p);
+	LIST_DEL_INIT(&r->list);
 err_free_r:
 	ha_free(&r);
 	return err_code;
@@ -3712,6 +3724,7 @@ int cfg_parse_resolvers(const char *file, int linenum, char **args, int kwm)
 				ha_alert("Parsing [%s:%d]: resolvers '%s' has same name as another resolvers (declared at %s:%d).\n",
 					 file, linenum, args[1], curr_resolvers->conf.file, curr_resolvers->conf.line);
 				err_code |= ERR_ALERT | ERR_ABORT;
+				goto out;
 			}
 		}
 
@@ -3749,6 +3762,7 @@ int cfg_parse_resolvers(const char *file, int linenum, char **args, int kwm)
 				ha_alert("Parsing [%s:%d]: nameserver '%s' has same name as another nameserver (declared at %s:%d).\n",
 					 file, linenum, args[1], newnameserver->conf.file, newnameserver->conf.line);
 				err_code |= ERR_ALERT | ERR_FATAL;
+				goto out;
 			}
 		}
 
@@ -3772,30 +3786,56 @@ int cfg_parse_resolvers(const char *file, int linenum, char **args, int kwm)
 			                         SRV_PARSE_PARSE_ADDR|SRV_PARSE_INITIAL_RESOLVE);
 			if (err_code & (ERR_FATAL|ERR_ABORT)) {
 				err_code |= ERR_ABORT;
+				free(newnameserver);
 				goto out;
 			}
 
 			if (dns_stream_init(newnameserver, curr_resolvers->px->srv) < 0) {
 				ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
 				err_code |= ERR_ALERT|ERR_ABORT;
+				free(newnameserver);
 				goto out;
 			}
 		}
 		else if (dns_dgram_init(newnameserver, sk) < 0) {
 			ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
 			err_code |= ERR_ALERT | ERR_ABORT;
+			free(newnameserver);
 			goto out;
 		}
 
 		if ((newnameserver->conf.file = strdup(file)) == NULL) {
 			ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
 			err_code |= ERR_ALERT | ERR_ABORT;
+			if (newnameserver->stream) {
+				dns_ring_free(newnameserver->stream->ring_req);
+				task_destroy(newnameserver->stream->task_req);
+				task_destroy(newnameserver->stream->task_rsp);
+				task_destroy(newnameserver->stream->task_idle);
+				free(newnameserver->stream);
+			} else if (newnameserver->dgram) {
+				dns_ring_free(newnameserver->dgram->ring_req);
+				free(newnameserver->dgram);
+			}
+			free(newnameserver);
 			goto out;
 		}
 
 		if ((newnameserver->id = strdup(args[1])) == NULL) {
 			ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
 			err_code |= ERR_ALERT | ERR_ABORT;
+			free((char *)newnameserver->conf.file);
+			if (newnameserver->stream) {
+				dns_ring_free(newnameserver->stream->ring_req);
+				task_destroy(newnameserver->stream->task_req);
+				task_destroy(newnameserver->stream->task_rsp);
+				task_destroy(newnameserver->stream->task_idle);
+				free(newnameserver->stream);
+			} else if (newnameserver->dgram) {
+				dns_ring_free(newnameserver->dgram->ring_req);
+				free(newnameserver->dgram);
+			}
+			free(newnameserver);
 			goto out;
 		}
 

src/sample.c

@@ -2150,11 +2150,11 @@ static int sample_conv_be2hex_check(struct arg *args, struct sample_conv *conv,
  */
 static int sample_conv_be2hex(const struct arg *args, struct sample *smp, void *private)
 {
-	struct buffer *trash = get_trash_chunk_sz(smp->data.u.str.data);
+	struct buffer *trash = get_trash_chunk_sz(smp->data.u.str.data * 2);
 	int chunk_size = args[1].data.sint;
 	const int last = args[2].data.sint ? smp->data.u.str.data - chunk_size + 1 : smp->data.u.str.data;
 	int i;
-	int max_size;
+	size_t max_size;
 	int ptr = 0;
 	unsigned char c;
 
@@ -2163,7 +2163,9 @@ static int sample_conv_be2hex(const struct arg *args, struct sample *smp, void *
 	trash->data = 0;
 	if (args[0].data.str.data == 0 && args[2].data.sint == 0)
 		chunk_size = smp->data.u.str.data;
-	max_size = trash->size - 2 * chunk_size;
+	if (2 * (size_t)chunk_size > trash->size)
+		return 0;
+	max_size = trash->size - 2 * (size_t)chunk_size;
 
 	while (ptr < last && trash->data <= max_size) {
 		if (ptr) {

src/server.c

@@ -145,6 +145,7 @@ static void srv_reset_path_parameters(struct server *s)
 {
 	HA_RWLOCK_WRLOCK(SERVER_LOCK, &s->path_params.param_lock);
 	s->path_params.nego_alpn[0] = 0;
+	s->path_params.srv_hash = 0;
 	HA_RWLOCK_WRUNLOCK(SERVER_LOCK, &s->path_params.param_lock);
 }
 
@@ -643,7 +644,7 @@ int srv_check_reuse_ws(struct server *srv)
 		 * for mux selection.
 		 */
 		const struct ist srv_mux = srv->mux_proto ?
-		                           srv->mux_proto->token : IST_NULL;
+		                           srv->mux_proto->mux_proto : IST_NULL;
 
 		switch (srv->ws) {
 		/* "auto" means use the same protocol : reuse is possible. */
@@ -935,6 +936,8 @@ static int srv_parse_enabled(char **args, int *cur_arg,
 	newsrv->next_state = SRV_ST_RUNNING;
 	newsrv->check.state &= ~CHK_ST_PAUSED;
 	newsrv->check.health = newsrv->check.rise;
+
+	srv_set_init_state(newsrv);
 	return 0;
 }
 
@@ -1013,13 +1016,19 @@ static int srv_parse_hash_key(char **args, int *cur_arg,
 			      struct proxy *curproxy, struct server *newsrv, char **err)
 {
 	if (!args[*cur_arg + 1]) {
-		memprintf(err, "'%s expects 'id', 'addr', or 'addr-port' value", args[*cur_arg]);
+		memprintf(err, "'%s expects 'id', 'id32', 'guid', 'addr', or 'addr-port' value", args[*cur_arg]);
 		return ERR_ALERT | ERR_FATAL;
 	}
 
 	if (strcmp(args[*cur_arg + 1], "id") == 0) {
 		newsrv->hash_key = SRV_HASH_KEY_ID;
 	}
+	else if (strcmp(args[*cur_arg + 1], "id32") == 0) {
+		newsrv->hash_key = SRV_HASH_KEY_ID32;
+	}
+	else if (strcmp(args[*cur_arg + 1], "guid") == 0) {
+		newsrv->hash_key = SRV_HASH_KEY_GUID;
+	}
 	else if (strcmp(args[*cur_arg + 1], "addr") == 0) {
 		newsrv->hash_key = SRV_HASH_KEY_ADDR;
 	}
@@ -1027,7 +1036,7 @@ static int srv_parse_hash_key(char **args, int *cur_arg,
 		newsrv->hash_key = SRV_HASH_KEY_ADDR_PORT;
 	}
 	else {
-		memprintf(err, "'%s' has to be 'id', 'addr', or 'addr-port'", args[*cur_arg]);
+		memprintf(err, "'%s' has to be 'id', 'id32', 'guid', 'addr', or 'addr-port'", args[*cur_arg]);
 		return ERR_ALERT | ERR_FATAL;
 	}
 
@@ -1124,22 +1133,25 @@ static int srv_parse_init_addr(char **args, int *cur_arg,
 
 /* Parse the "init-state" server keyword */
 static int srv_parse_init_state(char **args, int *cur_arg,
-							   struct proxy *curproxy, struct server *newsrv, char **err)
+				struct proxy *curproxy, struct server *newsrv, char **err)
 {
-	if (strcmp(args[*cur_arg + 1], "fully-up") == 0)
+	if (strcmp(args[*cur_arg + 1], "none") == 0)
-		newsrv->init_state= SRV_INIT_STATE_FULLY_UP;
+		newsrv->init_state = SRV_INIT_STATE_NONE;
+	else if (strcmp(args[*cur_arg + 1], "fully-up") == 0)
+		newsrv->init_state = SRV_INIT_STATE_FULLY_UP;
 	else if (strcmp(args[*cur_arg + 1], "up") == 0)
 		newsrv->init_state = SRV_INIT_STATE_UP;
 	else if (strcmp(args[*cur_arg + 1], "down") == 0)
-		newsrv->init_state= SRV_INIT_STATE_DOWN;
+		newsrv->init_state = SRV_INIT_STATE_DOWN;
 	else if (strcmp(args[*cur_arg + 1], "fully-down") == 0)
-		newsrv->init_state= SRV_INIT_STATE_FULLY_DOWN;
+		newsrv->init_state = SRV_INIT_STATE_FULLY_DOWN;
 	else {
-		memprintf(err, "'%s' expects one of 'fully-up', 'up', 'down', or 'fully-down' but got '%s'",
+		memprintf(err, "'%s' expects one of 'none', 'fully-up', 'up', 'down', or 'fully-down' but got '%s'",
 				  args[*cur_arg], args[*cur_arg + 1]);
 		return ERR_ALERT | ERR_FATAL;
 	}
 
+	srv_set_init_state(newsrv);
 	return 0;
 }
 
@@ -1308,19 +1320,20 @@ static int srv_parse_pool_max_conn(char **args, int *cur_arg, struct proxy *curp
 static int srv_parse_id(char **args, int *cur_arg, struct proxy *curproxy, struct server *newsrv, char **err)
 {
 	struct server *target;
+	llong id;
 
 	if (!*args[*cur_arg + 1]) {
 		memprintf(err, "'%s' : expects an integer argument", args[*cur_arg]);
 		return ERR_ALERT | ERR_FATAL;
 	}
 
-	newsrv->puid = atol(args[*cur_arg + 1]);
+	id = atol(args[*cur_arg + 1]);
-
+	if (id < 1 || id > ~0U) {
-	if (newsrv->puid <= 0) {
+		memprintf(err, "'%s' : custom id has to be between 1 and 4294967295.", args[*cur_arg]);
-		memprintf(err, "'%s' : custom id has to be > 0", args[*cur_arg]);
 		return ERR_ALERT | ERR_FATAL;
 	}
 
+	newsrv->puid = id;
 	target = server_find_by_id(curproxy, newsrv->puid);
 	if (target) {
 		memprintf(err, "'%s' : custom id %d already used at %s:%d ('server %s')",
@@ -2880,7 +2893,7 @@ void srv_settings_init(struct server *srv)
 	srv->agent.fall = DEF_AGENT_FALLTIME;
 	srv->agent.port = 0;
 
-	srv->init_state = SRV_INIT_STATE_UP;
+	srv->init_state = SRV_INIT_STATE_NONE;
 
 	srv->maxqueue = 0;
 	srv->minconn = 0;
@@ -3014,7 +3027,9 @@ void srv_settings_cpy(struct server *srv, const struct server *src, int srv_tmpl
 	srv->check.rise = srv->check.health = src->check.rise;
 	srv->check.fall               = src->check.fall;
 
-	/* Here we check if 'disabled' is the default server state */
+	/* Here we check if 'disabled' is the default server state. Otherwise,
+	 * we check 'init-state' parameter
+	 */
 	if (src->next_admin & (SRV_ADMF_CMAINT | SRV_ADMF_FMAINT)) {
 		srv->next_admin |= SRV_ADMF_CMAINT | SRV_ADMF_FMAINT;
 		srv->next_state        = SRV_ST_STOPPED;
@@ -3042,6 +3057,7 @@ void srv_settings_cpy(struct server *srv, const struct server *src, int srv_tmpl
 	srv->init_addr                = src->init_addr;
 
 	srv->init_state               = src->init_state;
+	srv_set_init_state(srv);
 #if defined(USE_OPENSSL)
 	srv_ssl_settings_cpy(srv, src);
 #endif
@@ -3055,8 +3071,8 @@ void srv_settings_cpy(struct server *srv, const struct server *src, int srv_tmpl
 	srv->tcp_ut = src->tcp_ut;
 #endif
 	srv->mux_proto = src->mux_proto;
-	if (srv->pool_conn_name)
+	if (src->pool_conn_name)
-		srv->pool_conn_name = strdup(srv->pool_conn_name);
+		srv->pool_conn_name = strdup(src->pool_conn_name);
 	srv->pool_purge_delay = src->pool_purge_delay;
 	srv->low_idle_conns = src->low_idle_conns;
 	srv->max_idle_conns = src->max_idle_conns;
@@ -3616,7 +3632,7 @@ int srv_postinit(struct server *srv)
 
 	/* initialize idle conns lists */
 	if (srv->max_idle_conns != 0) {
-		srv->curr_idle_thr = ha_aligned_zalloc(64, global.nbthread * sizeof(*srv->curr_idle_thr));
+		srv->curr_idle_thr = ha_aligned_zalloc(64, array_size_or_fail(global.nbthread, sizeof(*srv->curr_idle_thr)));
 		if (!srv->curr_idle_thr) {
 			ha_alert("memory error during idle conn list init for %s/%s server\n",
 			         srv->proxy->id, srv->id);
@@ -3958,6 +3974,10 @@ static int _srv_parse_finalize(char **args, int cur_arg,
 		ha_alert("unable to enable checks and tracking at the same time!\n");
 		return ERR_ALERT | ERR_FATAL;
 	}
+	if (srv->init_state != SRV_INIT_STATE_NONE && srv->trackit) {
+		ha_alert("unable to set init-state and tracking at the same time!\n");
+		return ERR_ALERT | ERR_FATAL;
+	}
 
 	if (srv->do_agent && !srv->agent.port) {
 		ha_alert("server %s does not have agent port. Agent check has been disabled.\n",
@@ -4024,6 +4044,18 @@ static int _srv_parse_finalize(char **args, int cur_arg,
 		return ERR_ALERT | ERR_FATAL;
 #endif
 	}
+	else {
+		if (srv->proxy->mode == PR_MODE_HTTP && !srv->mux_proto &&
+		    srv->ssl_ctx.alpn_str && strstr(srv->ssl_ctx.alpn_str, "\002h3")) {
+			if (!experimental_directives_allowed) {
+				ha_alert("HTTP/3 on TCP listed via ALPN requires the QMUX protocol which is experimental, "
+				         "must be allowed via a global 'expose-experimental-directives'.\n");
+				return ERR_ALERT | ERR_FATAL;
+			}
+
+			mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
+		}
+	}
 
 	if (!(srv->proxy->cap & PR_CAP_LB)) {
 		/* No need to wait for effective proxy mode, it is already known:
@@ -5226,6 +5258,8 @@ int srv_set_fqdn(struct server *srv, const char *hostname, int resolv_locked)
 	struct resolv_resolution *resolution;
 	char                  *hostname_dn;
 	int                    hostname_len, hostname_dn_len;
+	char                  *hostname_dup = NULL;
+	char                  *hostname_dn_dup = NULL;
 
 	/* Note that the server lock is already held. */
 	if (!srv->resolvers)
@@ -5256,13 +5290,18 @@ int srv_set_fqdn(struct server *srv, const char *hostname, int resolv_locked)
 
 	resolv_unlink_resolution(srv->resolv_requester);
 
+	hostname_dup    = strdup(hostname);
+	hostname_dn_dup = strdup(hostname_dn);
+	if (!hostname_dup || !hostname_dn_dup)
+		goto err;
+
 	free(srv->hostname);
 	free(srv->hostname_dn);
-	srv->hostname        = strdup(hostname);
+	srv->hostname = hostname_dup;
-	srv->hostname_dn     = strdup(hostname_dn);
+	srv->hostname_dn = hostname_dn_dup;
 	srv->hostname_dn_len = hostname_dn_len;
-	if (!srv->hostname || !srv->hostname_dn)
+	hostname_dup = NULL;
-		goto err;
+	hostname_dn_dup = NULL;
 
 	if (srv->flags & SRV_F_NO_RESOLUTION)
 		goto end;
@@ -5278,6 +5317,8 @@ int srv_set_fqdn(struct server *srv, const char *hostname, int resolv_locked)
   err:
 	if (!resolv_locked)
 		HA_SPIN_UNLOCK(DNS_LOCK, &srv->resolvers->lock);
+	ha_free(&hostname_dup);
+	ha_free(&hostname_dn_dup);
 	return -1;
 }
 
@@ -5702,11 +5743,13 @@ static int cli_parse_set_server(char **args, char *payload, struct appctx *appct
 		HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
 		if (strcmp(args[4], "on") == 0) {
 			if (srv_set_ssl(sv, 1)) {
+				HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
 				cli_dynerr(appctx, memprintf(&err, "failed to enable ssl for server %s.\n", args[2]));
 				goto out;
 			}
 		} else if (strcmp(args[4], "off") == 0) {
 			if (srv_set_ssl(sv, 0)) {
+				HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
 				cli_dynerr(appctx, memprintf(&err, "failed to disable ssl for server %s.\n", args[2]));
 				goto out;
 			}
@@ -5916,6 +5959,7 @@ static int cli_parse_enable_health(char **args, char *payload, struct appctx *ap
 
 	HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
 	sv->check.state |= CHK_ST_ENABLED;
+	srv_set_init_state(sv);
 	HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
 	return 1;
 }
@@ -6062,8 +6106,8 @@ static int srv_init_per_thr(struct server *srv)
 {
 	int i;
 
-	srv->per_thr = ha_aligned_zalloc(64, global.nbthread * sizeof(*srv->per_thr));
+	srv->per_thr = ha_aligned_zalloc(64, array_size_or_fail(global.nbthread, sizeof(*srv->per_thr)));
-	srv->per_tgrp = ha_aligned_zalloc(64, global.nbtgroups * sizeof(*srv->per_tgrp));
+	srv->per_tgrp = ha_aligned_zalloc(64, array_size_or_fail(global.nbtgroups, sizeof(*srv->per_tgrp)));
 	if (!srv->per_thr || !srv->per_tgrp)
 		return -1;
 
@@ -6254,9 +6298,9 @@ static int cli_parse_add_server(char **args, char *payload, struct appctx *appct
 		int proto_mode = conn_pr_mode_to_proto_mode(be->mode);
 		const struct mux_proto_list *mux_ent;
 
-		mux_ent = conn_get_best_mux_entry(srv->mux_proto->token, PROTO_SIDE_BE, srv_is_quic(srv), proto_mode);
+		mux_ent = conn_get_best_mux_entry(srv->mux_proto->mux_proto, IST_NULL, PROTO_SIDE_BE, srv_is_quic(srv), proto_mode);
 
-		if (!mux_ent || !isteq(mux_ent->token, srv->mux_proto->token)) {
+		if (!mux_ent || !isteq(mux_ent->mux_proto, srv->mux_proto->mux_proto)) {
 			ha_alert("MUX protocol is not usable for server.\n");
 			goto out;
 		}
@@ -6960,20 +7004,12 @@ static int _srv_update_status_adm(struct server *s, enum srv_adm_st_chg_cause ca
 		 */
 		if (s->check.state & CHK_ST_ENABLED) {
 			s->check.state &= ~CHK_ST_PAUSED;
-			if(s->init_state == SRV_INIT_STATE_FULLY_UP) {
+			s->check.health = s->check.rise; /* start OK but check immediately */
-				s->check.health = s->check.rise + s->check.fall - 1; /* initially UP, when all checks fail to bring server DOWN */
-			}
-			else if(s->init_state == SRV_INIT_STATE_DOWN) {
-				s->check.health = s->check.rise - 1; /* initially DOWN, when one check is successful bring server UP */
-			}
-			else if(s->init_state == SRV_INIT_STATE_FULLY_DOWN) {
-				s->check.health = 0; /* initially DOWN, when all checks are successful bring server UP */
-			} else {
-				s->check.health = s->check.rise; /* initially UP, when one check fails check brings server DOWN */
-			}
 		}
+		srv_set_init_state(s);
 
-		if ((!s->track || s->track->next_state != SRV_ST_STOPPED) &&
+		if (s->init_state == SRV_INIT_STATE_NONE &&
+		    (!s->track || s->track->next_state != SRV_ST_STOPPED) &&
 		    (!(s->agent.state & CHK_ST_ENABLED) || (s->agent.health >= s->agent.rise)) &&
 		    (!(s->check.state & CHK_ST_ENABLED) || (s->check.health >= s->check.rise))) {
 			if (s->track && s->track->next_state == SRV_ST_STOPPING) {

src/session.c

@@ -39,7 +39,7 @@ static const struct trace_event sess_trace_events[] = {
 	{ .mask = SESS_EV_NEW,      .name = "sess_new",     .desc = "new session creation" },
 #define           SESS_EV_END       (1ULL <<  1)
 	{ .mask = SESS_EV_END,      .name = "sess_end",     .desc = "session termination" },
-#define           SESS_EV_ERR       (1ULL <<  1)
+#define           SESS_EV_ERR       (1ULL <<  2)
 	{ .mask = SESS_EV_ERR,      .name = "sess_err",     .desc = "session error" },
 	{ }
 };
@@ -241,14 +241,17 @@ int session_accept_fd(struct connection *cli_conn)
 		if (l->bind_conf->options & BC_O_ACC_CIP)
 			cli_conn->flags |= CO_FL_ACCEPT_CIP;
 
-		if (l->bind_conf->mux_proto && isteq(l->bind_conf->mux_proto->token, ist("qmux")))
-			cli_conn->flags |= (CO_FL_QMUX_RECV|CO_FL_QMUX_SEND);
-
 		/* Add the handshake pseudo-XPRT */
 		if (cli_conn->flags & (CO_FL_ACCEPT_PROXY | CO_FL_ACCEPT_CIP)) {
 			if (xprt_add_hs(cli_conn) != 0)
 				goto out_free_conn;
 		}
+
+		/* Add handshake layer prior to MUX init if required. Does nothing if SSL layer is active though. */
+		if (l->bind_conf->mux_proto && l->bind_conf->mux_proto->init_xprt) {
+			if (xprt_add_l6hs(cli_conn, l->bind_conf->mux_proto->init_xprt))
+				goto out_free_conn;
+		}
 	}
 
 	/* Reversed conns already have an assigned session, do not recreate it. */
@@ -351,7 +354,7 @@ int session_accept_fd(struct connection *cli_conn)
 	 *           v       |           |        |
 	 *          conn -- owner ---> task <-----+
 	 */
-	if (cli_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS)) {
+	if (cli_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS | CO_FL_WAIT_XPRT_L6)) {
 		int timeout;
 		int clt_tmt = p->timeout.client;
 		int hs_tmt = p->timeout.client_hs;

src/sock.c

@@ -533,7 +533,7 @@ int sock_get_old_sockets(const char *unixsocket)
 
 	}
 	memset(&msghdr, 0, sizeof(msghdr));
-	cmsgbuf = malloc(CMSG_SPACE(sizeof(int)) * MAX_SEND_FD);
+	cmsgbuf = malloc(array_size_or_fail(CMSG_SPACE(sizeof(int)), MAX_SEND_FD));
 	if (!cmsgbuf) {
 		ha_warning("Failed to allocate memory to send sockets\n");
 		goto out;
@@ -561,13 +561,13 @@ int sock_get_old_sockets(const char *unixsocket)
 		goto out;
 	}
 
-	tmpbuf = malloc(fd_nb * (1 + MAXPATHLEN + 1 + IFNAMSIZ + sizeof(int)));
+	tmpbuf = malloc(array_size_or_fail(fd_nb, (1 + MAXPATHLEN + 1 + IFNAMSIZ + sizeof(int))));
 	if (tmpbuf == NULL) {
 		ha_warning("Failed to allocate memory while receiving sockets\n");
 		goto out;
 	}
 
-	tmpfd = malloc(fd_nb * sizeof(int));
+	tmpfd = malloc(array_size_or_fail(fd_nb, sizeof(int)));
 	if (tmpfd == NULL) {
 		ha_warning("Failed to allocate memory while receiving sockets\n");
 		goto out;
@@ -1011,6 +1011,7 @@ int sock_conn_check(struct connection *conn)
 			goto wait;
 
 		if (errno && errno != EISCONN) {
+			conn_set_errno(conn, errno);
 			conn_report_term_evt(conn, tevt_loc_fd, fd_tevt_type_connect_err);
 			goto out_error;
 		}

src/ssl_ckch.c

@@ -1099,7 +1099,7 @@ struct ckch_store *ckchs_dup(const struct ckch_store *src)
 		/* copy the array of domain strings */
 
 		while (src->conf.acme.domains[n]) {
-			r = my_realloc2(r, sizeof(char *) * (n + 2));
+			r = my_realloc2(r, array_size_or_fail(sizeof(char *), (n + 2)));
 			if (!r)
 				goto error;
 
@@ -1120,7 +1120,7 @@ struct ckch_store *ckchs_dup(const struct ckch_store *src)
 		/* copy the array of IP strings */
 
 		while (src->conf.acme.ips[n]) {
-			r = my_realloc2(r, sizeof(char *) * (n + 2));
+			r = my_realloc2(r, array_size_or_fail(sizeof(char *), (n + 2)));
 			if (!r)
 				goto error;
 
@@ -5329,7 +5329,7 @@ int ckch_conf_parse(char **args, int cur_arg, struct ckch_conf *f, int *found, c
 				do {
 					while (*e != ',' && *e != '\0')
 						e++;
-					r = my_realloc2(r, sizeof(char *) * (n + 2));
+					r = my_realloc2(r, array_size_or_fail(sizeof(char *), (n + 2)));
 					if (!r) {
 						ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
 						err_code |= ERR_ALERT | ERR_ABORT;

src/ssl_clienthello.c

@@ -349,7 +349,7 @@ int ssl_sock_switchctx_cbk(SSL *ssl, int *al, void *arg)
 	if ((TRACE_SOURCE)->verbosity >= SSL_VERB_ADVANCED) {
 		if (TRACE_ENABLED(TRACE_LEVEL_DATA, SSL_EV_CONN_CIPHERS_EXT, conn, 0, 0, 0)) {
 			const uint8_t *cipher_suites;
-			size_t len;
+			size_t __maybe_unused len;
 
 #if defined(OPENSSL_IS_BORINGSSL) || defined(OPENSSL_IS_AWSLC)
 			len = ctx->cipher_suites_len;

src/ssl_gencert.c

@@ -356,8 +356,10 @@ int ssl_sock_generate_certificate(const char *servername, struct bind_conf *bind
 			ssl_ctx = (SSL_CTX *)lru->data;
 		if (!ssl_ctx && lru) {
 			ssl_ctx = ssl_sock_do_create_cert(servername, bind_conf, ssl);
-			if (!ssl_ctx)
+			if (!ssl_ctx) {
+				HA_RWLOCK_WRUNLOCK(SSL_GEN_CERTS_LOCK, &ssl_ctx_lru_rwlock);
 				goto error;
+			}
 			lru64_commit(lru, ssl_ctx, cacert, 0, (void (*)(void *))SSL_CTX_free);
 		}
 		SSL_set_SSL_CTX(ssl, ssl_ctx);

src/ssl_ocsp.c

@@ -290,6 +290,8 @@ int ssl_sock_load_ocsp_response(struct buffer *ocsp_response,
 	int ret = 1;
 #ifdef HAVE_ASN1_TIME_TO_TM
 	struct tm nextupd_tm = {0};
+#else
+	long expire = 0;
 #endif
 
 	resp = d2i_OCSP_RESPONSE(NULL, (const unsigned char **)&p,
@@ -391,11 +393,12 @@ int ssl_sock_load_ocsp_response(struct buffer *ocsp_response,
 	}
 	ocsp->expire = my_timegm(&nextupd_tm) - OCSP_MAX_RESPONSE_TIME_SKEW;
 #else
-	ocsp->expire = asn1_generalizedtime_to_epoch(nextupd) - OCSP_MAX_RESPONSE_TIME_SKEW;
+	expire = asn1_generalizedtime_to_epoch(nextupd) - OCSP_MAX_RESPONSE_TIME_SKEW;
-	if (ocsp->expire < 0) {
+	if (expire < 0) {
 		memprintf(err, "OCSP single response: Invalid \"Next Update\" time");
 		goto out;
 	}
+	ocsp->expire = expire;
 #endif
 
 	if (ocsp->expire < date.tv_sec) {

src/ssl_sock.c

@@ -3743,7 +3743,7 @@ static void ssl_sock_resize_passphrase_cache(void)
 	int idx;
 	int new_size = passphrase_cache_size << 1;
 
-	passphrase_randoms = my_realloc2(passphrase_randoms, sizeof(*passphrase_randoms) * (new_size));
+	passphrase_randoms = my_realloc2(passphrase_randoms, array_size_or_fail(sizeof(*passphrase_randoms), (new_size)));
 	if (!passphrase_randoms) {
 		ha_alert("ssl_sock_passwd_cb: passphrase randoms realloc failed");
 		passphrase_idx = -1;
@@ -3759,7 +3759,7 @@ static void ssl_sock_resize_passphrase_cache(void)
 
 	if (passphrase_cache_size) {
 		passphrase_cache_size = new_size;
-		passphrase_cache = my_realloc2(passphrase_cache, sizeof(*passphrase_cache) * passphrase_cache_size);
+		passphrase_cache = my_realloc2(passphrase_cache, array_size_or_fail(sizeof(*passphrase_cache), passphrase_cache_size));
 		if (!passphrase_cache) {
 			ha_alert("ssl_sock_passwd_cb: passphrase cache realloc failed");
 			passphrase_idx = -1;
@@ -4287,13 +4287,15 @@ static int ssl_sess_new_srv_cb(SSL *ssl, SSL_SESSION *sess)
 			if (ssl_sock_get_alpn(conn, qc->xprt_ctx, &alpn, &len)) {
 				struct quic_early_transport_params *etps = &s->path_params.tps;
 
-				if (len < sizeof(s->path_params.nego_alpn) &&
+				if (s->path_params.srv_hash != conn->hash_node.key ||
-				    (len != strlen(s->path_params.nego_alpn) ||
+				    (len < sizeof(s->path_params.nego_alpn) &&
-				     memcmp(&s->path_params.nego_alpn, alpn, len) != 0)) {
+				     (len != strlen(s->path_params.nego_alpn) ||
+				     memcmp(&s->path_params.nego_alpn, alpn, len) != 0))) {
 					HA_RWLOCK_WRLOCK(SERVER_LOCK, &s->path_params.param_lock);
 					memcpy(&s->path_params.nego_alpn, alpn, len);
 					s->path_params.nego_alpn[len] = 0;
 					/* The transport parameters are not stored without ALPN */
+					s->path_params.srv_hash = conn->hash_node.key;
 					qc_early_transport_params_cpy(qc, etps, &qc->tx.params);
 					HA_RWLOCK_WRUNLOCK(SERVER_LOCK, &s->path_params.param_lock);
 				}
@@ -6920,12 +6922,14 @@ struct task *ssl_sock_io_cb(struct task *t, void *context, unsigned int state)
 
 				srv = objt_server(conn->target);
 				if (srv && ssl_sock_get_alpn(conn, ctx, &alpn, &len)) {
-					if (len < sizeof(srv->path_params.nego_alpn) &&
+					if (srv->path_params.srv_hash != conn->hash_node.key ||
-					    (len != strlen(srv->path_params.nego_alpn) ||
+					    (len < sizeof(srv->path_params.nego_alpn) &&
-					     memcmp(&srv->path_params.nego_alpn, alpn, len) != 0)) {
+					     (len != strlen(srv->path_params.nego_alpn) ||
+					      memcmp(&srv->path_params.nego_alpn, alpn, len) != 0))) {
 						HA_RWLOCK_WRLOCK(SERVER_LOCK, &srv->path_params.param_lock);
 						memcpy(&srv->path_params.nego_alpn, alpn, len);
 						srv->path_params.nego_alpn[len] = 0;
+						srv->path_params.srv_hash = conn->hash_node.key;
 						HA_RWLOCK_WRUNLOCK(SERVER_LOCK, &srv->path_params.param_lock);
 					}
 				}
@@ -6962,29 +6966,35 @@ struct task *ssl_sock_io_cb(struct task *t, void *context, unsigned int state)
 		 * woke a tasklet already.
 		 */
 		if (ctx->conn->xprt_ctx == ctx) {
+			const struct mux_proto_list *mux;
 			int closed_connection = 0;
 
 			if (!ctx->conn->mux) {
-				if (ctx->conn->flags & (CO_FL_QMUX_RECV|CO_FL_QMUX_SEND)) {
+				mux = !conn_is_back(conn) ?
-					const struct xprt_ops *ops = xprt_get(XPRT_QMUX);
+				  conn_select_mux_fe(conn) : conn_select_mux_be(conn);
-					void *xprt_ctx_hs = NULL;
 
-					ret = ops->init(conn, &xprt_ctx_hs);
+				if (mux->init_xprt) {
-					BUG_ON(ret);
+					ret = xprt_add_l6hs(conn, mux->init_xprt);
+					/* Frontend conn must be freed in case of XPRT init failure. */
+					if (ret) {
+						if (!conn_is_back(conn)) {
+							conn->flags |= CO_FL_ERROR; /* Ensure conn will be freed on next call. */
+							ret = conn_complete_session(conn);
+							BUG_ON(ret >= 0); /* conn_complete_session() expected to fail on CO_FL_ERROR */
+							t = NULL;
+						}
+						goto leave;
+					}
 
-					ret = ops->add_xprt(conn, xprt_ctx_hs,
+					ret = conn_xprt_start(conn);
-					  conn->xprt_ctx, conn->xprt, NULL, NULL);
-					BUG_ON(ret);
-
-					conn->xprt = ops;
-					conn->xprt_ctx = xprt_ctx_hs;
-
-
-					ret = conn->xprt->start(conn, xprt_ctx_hs);
-					BUG_ON(ret);
 				}
-				else
+				else {
+					/* TODO MUX selection already performs by conn_select_mux_fe/be().
+					 * Implement an alternative to conn_create_mux() to skip this
+					 * part and directly init the connection and its MUX.
+					 */
 					ret = conn_create_mux(ctx->conn, &closed_connection);
+				}
 			}
 
 			if (ret >= 0 && ctx->conn->mux && !woke && ctx->conn->mux && ctx->conn->mux->wake) {

src/stats-file.c

@@ -417,7 +417,7 @@ void apply_stats_file(void)
 		goto out;
 	}
 
-	line = malloc(sizeof(char) * LINESIZE);
+	line = malloc(array_size_or_fail(sizeof(char), LINESIZE));
 	if (!line) {
 		ha_warning("config: Can't load stats-file '%s': line alloc error.\n", global.stats_file);
 		goto out;

src/stats.c

@@ -1208,7 +1208,7 @@ static int allocate_stats_px_postcheck(void)
 
 	stat_cols_len[STATS_DOMAIN_PROXY] += ST_I_PX_MAX;
 
-	stat_cols[STATS_DOMAIN_PROXY] = malloc(stat_cols_len[STATS_DOMAIN_PROXY] * sizeof(struct name_desc));
+	stat_cols[STATS_DOMAIN_PROXY] = malloc(array_size_or_fail(stat_cols_len[STATS_DOMAIN_PROXY], sizeof(struct name_desc)));
 	if (!stat_cols[STATS_DOMAIN_PROXY]) {
 		ha_alert("stats: cannot allocate all fields for proxy statistics\n");
 		err_code |= ERR_ALERT | ERR_FATAL;
@@ -1247,7 +1247,7 @@ static int allocate_stats_rslv_postcheck(void)
 	size_t i = 0, offset;
 	int err_code = 0;
 
-	stat_cols[STATS_DOMAIN_RESOLVERS] = malloc(stat_cols_len[STATS_DOMAIN_RESOLVERS] * sizeof(struct name_desc));
+	stat_cols[STATS_DOMAIN_RESOLVERS] = malloc(array_size_or_fail(stat_cols_len[STATS_DOMAIN_RESOLVERS], sizeof(struct name_desc)));
 	if (!stat_cols[STATS_DOMAIN_RESOLVERS]) {
 		ha_alert("stats: cannot allocate all fields for resolver statistics\n");
 		err_code |= ERR_ALERT | ERR_FATAL;
@@ -1282,7 +1282,7 @@ static int allocate_stat_lines_per_thread(void)
 	for (i = 0; i < STATS_DOMAIN_COUNT; ++i) {
 		const int domain = domains[i];
 
-		stat_lines[domain] = malloc(stat_cols_len[domain] * sizeof(struct field));
+		stat_lines[domain] = malloc(array_size_or_fail(stat_cols_len[domain], sizeof(struct field)));
 		if (!stat_lines[domain])
 			return 0;
 	}

src/stick_table.c

@@ -276,6 +276,7 @@ int stktable_trash_oldest(struct stktable *t)
 {
 	struct stksess *ts;
 	struct eb32_node *eb;
+	struct list tofree_list;
 	int max_search; // no more than 50% misses
 	int max_per_bucket;
 	int done_per_bucket;
@@ -289,7 +290,7 @@ int stktable_trash_oldest(struct stktable *t)
 
 	/* start from a random bucket number to avoid starvation in the last ones */
 	bucket = init_bucket = statistical_prng_range(CONFIG_HAP_TBL_BUCKETS - 1);
-
+	LIST_INIT(&tofree_list);
 	to_batch = STKTABLE_MAX_UPDATES_AT_ONCE;
 
 	max_search = to_batch * 2; // no more than 50% misses
@@ -390,7 +391,8 @@ int stktable_trash_oldest(struct stktable *t)
 			ebmb_delete(&ts->key);
 			MT_LIST_DELETE(&ts->pend_updts);
 			eb32_delete(&ts->upd);
-			__stksess_free(t, ts);
+			LIST_APPEND(&tofree_list, mt_list_to_list(&ts->pend_updts));
+
 			batched++;
 			done_per_bucket++;
 
@@ -417,6 +419,12 @@ int stktable_trash_oldest(struct stktable *t)
 			bucket = 0;
 	} while (max_search > 0 && bucket != init_bucket);
 
+	while (!LIST_ISEMPTY(&tofree_list)) {
+		ts = LIST_ELEM(tofree_list.n, struct stksess *, pend_updts);
+		LIST_DELETE(mt_list_to_list(&ts->pend_updts));
+		__stksess_free(t, ts);
+	}
+
 	return batched;
 }
 
@@ -953,6 +961,7 @@ struct task *process_tables_expire(struct task *task, void *context, unsigned in
 	struct stktable *t;
 	struct stksess *ts;
 	struct eb32_node *table_eb, *eb;
+	struct list tofree_list;
 	int updt_locked;
 	int to_visit;
 	int task_exp;
@@ -960,6 +969,8 @@ struct task *process_tables_expire(struct task *task, void *context, unsigned in
 
 	task_exp = TICK_ETERNITY;
 
+	LIST_INIT(&tofree_list);
+
 	bucket = (ps - &per_bucket[0]);
 
 	to_visit = STKTABLE_MAX_UPDATES_AT_ONCE;
@@ -1088,7 +1099,7 @@ struct task *process_tables_expire(struct task *task, void *context, unsigned in
 			ebmb_delete(&ts->key);
 			MT_LIST_DELETE(&ts->pend_updts);
 			eb32_delete(&ts->upd);
-			__stksess_free(t, ts);
+			LIST_APPEND(&tofree_list, mt_list_to_list(&ts->pend_updts));
 		}
 
 		if (updt_locked)
@@ -1110,6 +1121,13 @@ struct task *process_tables_expire(struct task *task, void *context, unsigned in
 		if (!tick_isset(task_exp) || (tick_isset(next_exp_table) && tick_is_lt(next_exp_table, task_exp)))
 			task_exp = next_exp_table;
 		HA_RWLOCK_WRUNLOCK(STK_TABLE_LOCK, &t->buckets[bucket].sh_lock);
+
+		while (!LIST_ISEMPTY(&tofree_list)) {
+			ts = LIST_ELEM(tofree_list.n, struct stksess *, pend_updts);
+			LIST_DELETE(mt_list_to_list(&ts->pend_updts));
+			__stksess_free(t, ts);
+		}
+
 		tmpnode = eb32_next(table_eb);
 
 		if (table_eb->key != next_exp_table) {
@@ -2675,10 +2693,12 @@ static enum act_return action_inc_gpc(struct act_rule *rule, struct proxy *px,
 	struct stkctr *stkctr;
 
 	/* Extract the stksess, return OK if no stksess available. */
-	if (s)
+	if (s && s->stkctr)
 		stkctr = &s->stkctr[rule->arg.gpc.sc];
-	else
+	else if (sess->stkctr)
 		stkctr = &sess->stkctr[rule->arg.gpc.sc];
+	else
+		return ACT_RET_CONT;
 
 	ts = stkctr_entry(stkctr);
 	if (ts) {
@@ -2716,10 +2736,12 @@ static enum act_return action_inc_gpc0(struct act_rule *rule, struct proxy *px,
 	unsigned int period = 0;
 
 	/* Extract the stksess, return OK if no stksess available. */
-	if (s)
+	if (s && s->stkctr)
 		stkctr = &s->stkctr[rule->arg.gpc.sc];
-	else
+	else if (sess->stkctr)
 		stkctr = &sess->stkctr[rule->arg.gpc.sc];
+	else
+		return ACT_RET_CONT;
 
 	ts = stkctr_entry(stkctr);
 	if (ts) {
@@ -5956,7 +5978,7 @@ static int stkt_create_stk_ctr_pool(void)
 	if (!global.tune.nb_stk_ctr)
 		return 0;
 
-	pool_head_stk_ctr = create_pool("stk_ctr", sizeof(*((struct session*)0)->stkctr) * global.tune.nb_stk_ctr, MEM_F_SHARED);
+	pool_head_stk_ctr = create_pool("stk_ctr", array_size_or_fail(sizeof(*((struct session*)0)->stkctr), global.tune.nb_stk_ctr), MEM_F_SHARED);
 	if (!pool_head_stk_ctr) {
 		ha_alert("out of memory while creating the stick-counters pool.\n");
 		return ERR_ABORT;

src/stream.c

@@ -1617,7 +1617,7 @@ int stream_set_http_mode(struct stream *s, const struct mux_proto_list *mux_prot
 
 		sc_conn_prepare_endp_upgrade(sc);
 		if (conn_upgrade_mux_fe(conn, sc, &s->req.buf,
-					(mux_proto ? mux_proto->token : ist("")),
+					(mux_proto ? mux_proto->mux_proto : ist("")),
 					PROTO_MODE_HTTP)  == -1) {
 			sc_conn_abort_endp_upgrade(sc);
 			return 0;
@@ -3268,15 +3268,15 @@ static int check_tcp_switch_stream_mode(struct act_rule *rule, struct proxy *px,
 		px->options |= PR_O_HTTP_UPG;
 
 	if (mux_proto) {
-		mux_ent = conn_get_best_mux_entry(mux_proto->token, PROTO_SIDE_FE, 0, mode);
+		mux_ent = conn_get_best_mux_entry(mux_proto->mux_proto, IST_NULL, PROTO_SIDE_FE, 0, mode);
-		if (!mux_ent || !isteq(mux_ent->token, mux_proto->token)) {
+		if (!mux_ent || !isteq(mux_ent->mux_proto, mux_proto->mux_proto)) {
 			memprintf(err, "MUX protocol '%.*s' is not compatible with the selected mode",
-				  (int)mux_proto->token.len, mux_proto->token.ptr);
+				  (int)mux_proto->mux_proto.len, mux_proto->mux_proto.ptr);
 			return 0;
 		}
 	}
 	else {
-		mux_ent = conn_get_best_mux_entry(IST_NULL, PROTO_SIDE_FE, 0, mode);
+		mux_ent = conn_get_best_mux_entry(IST_NULL, IST_NULL, PROTO_SIDE_FE, 0, mode);
 		if (!mux_ent) {
 			memprintf(err, "Unable to find compatible MUX protocol with the selected mode");
 			return 0;

src/tcpcheck.c

@@ -834,6 +834,8 @@ enum tcpcheck_eval_ret tcpcheck_spop_expect_hello(struct check *check, struct tc
 					goto invalid_frame;
 				if (decode_varint(&ptr, end, &sz) == -1)
 					goto invalid_frame;
+				if (sz >= SPOP_ERR_ENTRIES)
+					sz = SPOP_ERR_UNKNOWN;
 				check->code = sz;
 			}
 
@@ -989,7 +991,7 @@ enum tcpcheck_eval_ret tcpcheck_agent_expect_reply(struct check *check, struct t
 	const char *sc = NULL; /* maxconn */
 	const char *err = NULL; /* first error to report */
 	const char *wrn = NULL; /* first warning to report */
-	char *cmd, *p;
+	char *cmd, *p, *end;
 
 	TRACE_ENTER(CHK_EV_TCPCHK_EXP, check);
 
@@ -1018,10 +1020,11 @@ enum tcpcheck_eval_ret tcpcheck_agent_expect_reply(struct check *check, struct t
 	 */
 
 	p = b_head(&check->bi);
-	while (*p && *p != '\n' && *p != '\r')
+	end = b_tail(&check->bi);
+	while (p < end && *p && *p != '\n' && *p != '\r')
 		p++;
 
-	if (!*p) {
+	if (!*p || p == end) {
 		if (!last_read)
 			goto wait_more_data;
 
@@ -1570,7 +1573,7 @@ enum tcpcheck_eval_ret tcpcheck_eval_connect(struct check *check, struct tcpchec
 		else {
 			int mode = tcpchk_rules_type_to_proto_mode(check->tcpcheck->rs->flags);
 
-			mux_ops = conn_get_best_mux(conn, IST_NULL, PROTO_SIDE_BE, mode);
+			mux_ops = conn_get_best_mux(conn, IST_NULL, IST_NULL, PROTO_SIDE_BE, mode);
 		}
 		if (mux_ops && conn_install_mux(conn, mux_ops, check->sc, proxy, check->sess) < 0) {
 			TRACE_ERROR("failed to install mux", CHK_EV_TCPCHK_CONN|CHK_EV_TCPCHK_ERR, check);
@@ -1611,6 +1614,7 @@ enum tcpcheck_eval_ret tcpcheck_eval_connect(struct check *check, struct tcpchec
 	case SF_ERR_RESOURCE:
 	case SF_ERR_INTERNAL:
 		TRACE_ERROR("report connection error", CHK_EV_TCPCHK_CONN|CHK_EV_TCPCHK_ERR, check, 0, 0, (size_t[]){status});
+		/* note: errno is no longer guaranteed here */
 		chk_report_conn_err(check, errno, 0);
 		ret = TCPCHK_EVAL_STOP;
 		goto out;
@@ -2648,6 +2652,7 @@ int tcpcheck_main(struct check *check)
   out_end_tcpcheck:
 	if ((conn && conn->flags & CO_FL_ERROR) || sc_ep_test(sc, SE_FL_ERROR)) {
 		TRACE_ERROR("report connection error", CHK_EV_TCPCHK_EVAL|CHK_EV_TCPCHK_ERR, check);
+		/* note: errno is no longer guaranteed here */
 		chk_report_conn_err(check, errno, 0);
 	}
 

src/xprt_qmux.c

@@ -12,6 +12,9 @@
 #include <haproxy/quic_frame.h>
 #include <haproxy/quic_tp-t.h>
 
+/* Default protocol when not running over SSL layer. */
+#define XPRT_QMUX_DEFAULT_ALPN  "h3"
+
 struct xprt_qmux_ctx {
 	struct connection *conn;
 	struct wait_event wait_event;
@@ -207,7 +210,7 @@ struct task *xprt_qmux_io_cb(struct task *t, void *context, unsigned int state)
 
  out:
 	if ((conn->flags & CO_FL_ERROR) ||
-	    !(conn->flags & (CO_FL_QMUX_RECV|CO_FL_QMUX_SEND))) {
+	    !(conn->flags & CO_FL_WAIT_XPRT_L6)) {
 		/* XPRT should be unsubscribed when transfer done or on error. */
 		BUG_ON(ctx->wait_event.events);
 
@@ -300,6 +303,11 @@ static int xprt_qmux_init(struct connection *conn, void **xprt_ctx)
 	ctx->lparams.initial_max_stream_data_bidi_remote = qcm_stream_rx_bufsz();
 	ctx->lparams.initial_max_stream_data_uni = qcm_stream_rx_bufsz();
 
+	/* Ensure the connection flags are set. Necessary when current XPRT is
+	 * activated without explicit "proto qmux" configuration.
+	 */
+	conn->flags |= (CO_FL_QMUX_RECV|CO_FL_QMUX_SEND);
+
 	*xprt_ctx = ctx;
 
 	return 0;
@@ -327,7 +335,7 @@ static void xprt_qmux_close(struct connection *conn, void *xprt_ctx)
 	if (ctx->ops_lower && ctx->ops_lower->close)
 		ctx->ops_lower->close(conn, ctx->ctx_lower);
 
-	conn->flags &= ~(CO_FL_QMUX_RECV|CO_FL_QMUX_SEND);
+	conn->flags &= ~CO_FL_WAIT_XPRT_L6;
 
 	BUG_ON(conn->xprt_ctx != ctx);
 	conn->xprt_ctx = ctx->ctx_lower;
@@ -341,6 +349,14 @@ static int xprt_qmux_get_alpn(const struct connection *conn, void *xprt_ctx,
                               const char **str, int *len)
 {
 	struct xprt_qmux_ctx *ctx = xprt_ctx;
+
+	/* Return a the default ALPN if lower layer is not able to negotiate it. */
+	if (!ctx->ops_lower || !ctx->ops_lower->get_alpn) {
+		*str = XPRT_QMUX_DEFAULT_ALPN;
+		*len = strlen(XPRT_QMUX_DEFAULT_ALPN);
+		return 1;
+	}
+
 	return ctx->ops_lower->get_alpn(conn, ctx->ctx_lower, str, len);
 }