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opnsense-src/sys/netinet
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Michael Tuexen 003f1ebcbc tcp: improve consistency of syncache_respond() failure handling 
When the initial sending of the SYN ACK segment using
syncache_respond() fails, it is handled as a permanent error.
To improve consistency, apply this policy in all cases, where
syncache_respond() is called. These include
* timer based retransmissions of the SYN ACK
* retransmitting a SYN ACK in response to a SYN retransmission
* sending of challenge ACKs in response to received RST segments
In these cases, fall back to SYN cookies, if enabled.
While there, also improve consistency of the TCP stats counters.

Reviewed by:		cc, glebius (earlier version)
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D46428

(cherry picked from commit ef438f7706be48f1cf7fd4c8a60329e1619cfe30)
2024-10-31 12:17:53 +01:00
..
cc tcp cc: Remove a stray semicolon 2024-10-31 12:40:18 +08:00
khelp sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
libalias libalias: fix subtle racy problem in outside-inside forwarding 2024-08-25 13:31:24 +07:00
netdump netdump: Check the return value of ifunit_ref() 2023-10-08 20:41:42 -04:00
tcp_stacks tcp rack, bbr: improve handling of soft errors 2024-10-31 12:16:29 +01:00
accf_data.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
accf_dns.c sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
accf_http.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
dccp.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
icmp6.h icmp6: move ICMPv6 related tunables to the files where they are used 2024-06-26 12:48:44 +08:00
icmp_var.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
if_ether.c Support ARP for 802 networks 2024-04-27 10:45:22 -04:00
if_ether.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
igmp.c netinet: Remove stale references to Giant from comments 2024-02-03 14:10:36 -05:00
igmp.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
igmp_var.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
in.c carp: check CARP status in in_localip_fib(), in6_localip_fib() 2024-03-28 12:35:45 -07:00
in.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
in_cksum.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_debug.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_fib.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_fib.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
in_fib_algo.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_fib_dxr.c fib_dxr: code hygiene, prune old code, no functional changes 2024-05-22 19:34:40 +02:00
in_gif.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_jail.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_kdtrace.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_kdtrace.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
in_mcast.c mcast: fix leaked igmp packets on multicast cleanup 2024-08-26 09:46:21 -06:00
in_pcb.c netinet: Explicitly disallow connections to the unspecified address 2024-09-20 11:39:16 +00:00
in_pcb.h inpcb: reoder inpcb destruction 2024-01-08 16:29:38 -08:00
in_pcb_var.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
in_prot.c Fix 'security.bsd.see_jail_proc' by using cr_bsd_visible() 2023-10-17 16:42:58 -03:00
in_proto.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_rmx.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
in_rss.c sys: Remove $FreeBSD$: two-line .c pattern 2023-08-16 11:54:30 -06:00
in_rss.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
in_systm.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
in_var.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
ip.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
ip6.h netinet: Define IPv6 ECN mask 2024-01-11 09:18:12 -05:00
ip_carp.c carp(4): Fix a typo in a source code comment 2024-03-03 18:48:32 +01:00
ip_carp.h sys: Remove $FreeBSD$: one-line .c comment pattern 2023-08-16 11:54:24 -06:00
ip_carp_nl.h carp: allow commands to use interface name rather than index 2023-03-31 11:29:58 +02:00
ip_divert.c pf: use an enum for packet direction in divert tag 2023-11-09 10:56:20 +01:00
ip_divert.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
ip_dummynet.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
ip_ecn.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_ecn.h sys: Remove $FreeBSD$: one-line .c comment pattern 2023-08-16 11:54:24 -06:00
ip_encap.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_encap.h sys: Remove $FreeBSD$: one-line .c comment pattern 2023-08-16 11:54:24 -06:00
ip_fastfwd.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_fw.h ipfw: Fix a typo in a source code comment 2024-05-16 07:59:09 +02:00
ip_gre.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_icmp.c icmp: correct the assertion that checks limit + jitter 2024-06-26 12:48:45 +08:00
ip_icmp.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
ip_id.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_input.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_mroute.c ip_mroute: Use NET_EPOCH_WAIT() macro 2024-07-05 23:11:51 +08:00
ip_mroute.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
ip_options.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_options.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
ip_output.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ip_reass.c vnet: (read) lock the vnet list while iterating it 2023-12-14 12:20:25 +01:00
ip_var.h ip_var.h: align comment style 2023-11-09 10:56:26 +01:00
pim.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
pim_var.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
raw_ip.c inpcb: reoder inpcb destruction 2024-01-08 16:29:38 -08:00
sctp.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_asconf.c sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_asconf.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_auth.c sctp: cleanup locking for notifications 2023-09-15 19:41:16 +02:00
sctp_auth.h sctp: cleanup SCTP AUTH related notification 2023-09-15 19:35:57 +02:00
sctp_bsd_addr.c sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_bsd_addr.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_cc_functions.c sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_constants.h sctp: make sure all SCTP RESET notifications use sctp_ulp_notify() 2023-09-15 19:38:29 +02:00
sctp_crc32.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
sctp_crc32.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_header.h sctp: store heartbeat creation time as time_t 2024-08-04 00:27:00 +02:00
sctp_indata.c sctp: improve input validation for data chunks 2024-08-06 23:32:06 +02:00
sctp_indata.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_input.c sctp: store cookie secret change time as time_t 2024-08-04 00:25:22 +02:00
sctp_input.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_kdtrace.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
sctp_kdtrace.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_lock_bsd.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_module.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
sctp_os.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_os_bsd.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_output.c sctp: store heartbeat creation time as time_t 2024-08-04 00:27:00 +02:00
sctp_output.h sctp: improve sending of packets containing an INIT ACK chunk 2024-04-17 15:47:17 +02:00
sctp_pcb.c sctp: store vtag expire time as time_t 2024-08-04 00:26:10 +02:00
sctp_pcb.h sctp: store vtag expire time as time_t 2024-08-04 00:26:10 +02:00
sctp_peeloff.c sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_peeloff.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_ss_functions.c sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_structs.h sctp: cleanup handling of graceful shutdown of the peer 2023-08-19 12:35:49 +02:00
sctp_syscalls.c sctp: propagate cap rights on sctp_peeloff 2024-10-17 12:29:21 -04:00
sctp_sysctl.c sctp: fix format of sysctl variables 2024-08-30 08:31:35 +02:00
sctp_sysctl.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_timer.c sctp: cleanup 2023-09-15 19:30:51 +02:00
sctp_timer.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_uio.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctp_usrreq.c sctp: further improve shutting down the read side of a socket 2023-09-15 19:48:02 +02:00
sctp_var.h sctp: cleanup cdefs.h include 2023-08-18 15:25:34 +02:00
sctputil.c sctp: improve heartbeat timer computation 2024-08-04 00:27:53 +02:00
sctputil.h sctp: make sure all SCTP RESET notifications use sctp_ulp_notify() 2023-09-15 19:38:29 +02:00
siftr.c siftr: remove the shutdown_pre_sync event handler on unload 2024-08-02 09:30:38 +02:00
tcp.h tcp: Add a new kernel-only TCP_USE_DDP socket option 2024-04-12 12:25:11 -07:00
tcp_accounting.h Move access to tcp's t_logstate into inline functions and provide new tracepoint and bbpoint capabilities. 2023-03-16 11:43:16 -04:00
tcp_ecn.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
tcp_ecn.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
tcp_fastopen.c tcp_fastopen: Fix a typo in a source code comment 2024-01-25 07:44:39 +01:00
tcp_fastopen.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
tcp_fsm.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
tcp_hostcache.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
tcp_hpts.c Optimize HPTS so that little work is done until we have a hpts thread that is over the connection threshold 2024-04-24 22:37:40 +02:00
tcp_hpts.h HTPS has actually three states not two so the macro needs to account for that. 2024-04-24 22:36:32 +02:00
tcp_input.c tcp: fix duplicate retransmissions when RTO happens during SACK loss recovery 2024-10-18 09:51:38 +02:00
tcp_log_buf.c tcp bblog: use correct length 2024-04-17 15:51:00 +02:00
tcp_log_buf.h tcp: whitespace cleanup of enum tcp_log_events 2024-08-04 00:53:41 +02:00
tcp_lro.c tcp: initialize the LRO hash table with correct size 2024-08-30 08:29:50 +02:00
tcp_lro.h hpts/lro: make tcp_lro_flush_tcphpts() and tcp_run_hpts() pointers 2024-01-16 10:47:49 -08:00
tcp_lro_hpts.c TCP LRO: add dtrace probe points 2024-04-17 15:48:45 +02:00
tcp_offload.c tcp_fill_info(): Change lock assertion on INPCB to locked only 2023-08-22 20:33:49 +02:00
tcp_offload.h tcp_fill_info(): Change lock assertion on INPCB to locked only 2023-08-22 20:33:49 +02:00
tcp_output.c tcp: fix duplicate retransmissions when RTO happens during SACK loss recovery 2024-10-18 09:51:38 +02:00
tcp_pcap.c sys: Style fix for M_EXT | M_EXTPG 2024-01-18 14:35:14 -08:00
tcp_pcap.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
tcp_ratelimit.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
tcp_ratelimit.h tcp: Silence a -Wunused-function warning in tcp_ratelimit.h 2024-02-18 15:26:28 +01:00
tcp_reass.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
tcp_sack.c tcp: fix duplicate retransmissions when RTO happens during SACK loss recovery 2024-10-18 09:51:38 +02:00
tcp_seq.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
tcp_stats.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
tcp_subr.c tcp: initialize V_ts_offset_secret for all vnets 2024-08-12 07:34:35 +02:00
tcp_syncache.c tcp: improve consistency of syncache_respond() failure handling 2024-10-31 12:17:53 +01:00
tcp_syncache.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
tcp_timer.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
tcp_timer.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
tcp_timewait.c tcp: improve consistency 2024-04-17 16:00:09 +02:00
tcp_usrreq.c ddb: update printing of t_flags and tflags2 2024-08-13 19:05:06 +02:00
tcp_var.h tcp: fix duplicate retransmissions when RTO happens during SACK loss recovery 2024-10-18 09:51:38 +02:00
tcpip.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
toecore.c tcp_fill_info(): Change lock assertion on INPCB to locked only 2023-08-22 20:33:49 +02:00
toecore.h tcp_fill_info(): Change lock assertion on INPCB to locked only 2023-08-22 20:33:49 +02:00
udp.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
udp_usrreq.c udplite: make socketoption available on IPv6 sockets 2024-01-10 20:22:52 -05:00
udp_var.h sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
udplite.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00