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ipfilter: Make LARGE_NAT a tunable.
LARGE_NAT is a C macro that increases NAT_SIZE from 127 to 2047, RDR_SIZE from 127 to 2047, HOSTMAP_SIZE from 2047 to 8191, NAT_TABLE_MAX from 30000 to 180000, and NAT_TABLE_SZ from 2047 to 16383. These values can be altered at runtime using the ipf -T command however some adminstrators of large firewalls rebuild the kernel to enable LARGE_NAT at boot. This revision adds the tunable net.inet.ipf.large_nat which allows an administrator to set this option at boot instead of build time. Setting the LARGE_NAT macro to 1 is unaffected allowing build-time users to continue using the old way.
This commit is contained in:
Cy Schubert
parent
e2ad10e847
commit
a805ffbcbc
6 changed files with 65 additions and 44 deletions
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@ -9338,6 +9338,11 @@ ipf_main_soft_create(arg)
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softc->ipf_icmpminfragmtu = 68;
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softc->ipf_flags = IPF_LOGGING;
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#ifdef LARGE_NAT
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softc->ipf_large_nat = 1;
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#endif
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ipf_fbsd_kenv_get(softc);
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return softc;
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}
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@ -1547,6 +1547,7 @@ typedef struct ipf_main_softc_s {
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u_int ipf_icmptimeout;
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u_int ipf_icmpacktimeout;
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u_int ipf_iptimeout;
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u_int ipf_large_nat;
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u_long ipf_ticks;
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u_long ipf_userifqs;
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u_long ipf_rb_no_mem;
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@ -1653,6 +1654,7 @@ extern int ipf_pfil_hook(void);
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extern int ipf_pfil_unhook(void);
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extern void ipf_event_reg(void);
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extern void ipf_event_dereg(void);
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extern void ipf_fbsd_kenv_get(ipf_main_softc_t *);
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# endif
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# if defined(INSTANCES)
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@ -1487,3 +1487,10 @@ ipf_pcksum6(m, ip6, off, len)
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#endif
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}
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#endif
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void
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ipf_fbsd_kenv_get(ipf_main_softc_t *softc)
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{
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TUNABLE_INT_FETCH("net.inet.ipf.large_nat",
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&softc->ipf_large_nat);
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}
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@ -321,11 +321,19 @@ ipf_nat_soft_create(softc)
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softn->ipf_nat_list_tail = &softn->ipf_nat_list;
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softn->ipf_nat_table_max = NAT_TABLE_MAX;
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softn->ipf_nat_table_sz = NAT_TABLE_SZ;
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softn->ipf_nat_maprules_sz = NAT_SIZE;
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softn->ipf_nat_rdrrules_sz = RDR_SIZE;
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softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE;
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if (softc->ipf_large_nat) {
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softn->ipf_nat_table_max = NAT_TABLE_MAX_LARGE;
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softn->ipf_nat_table_sz = NAT_TABLE_SZ_LARGE;
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softn->ipf_nat_maprules_sz = NAT_SIZE_LARGE;
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softn->ipf_nat_rdrrules_sz = RDR_SIZE_LARGE;
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softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE_LARGE;
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} else {
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softn->ipf_nat_table_max = NAT_TABLE_MAX_NORMAL;
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softn->ipf_nat_table_sz = NAT_TABLE_SZ_NORMAL;
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softn->ipf_nat_maprules_sz = NAT_SIZE_NORMAL;
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softn->ipf_nat_rdrrules_sz = RDR_SIZE_NORMAL;
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softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE_NORMAL;
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}
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softn->ipf_nat_doflush = 0;
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#ifdef IPFILTER_LOG
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softn->ipf_nat_logging = 1;
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@ -492,10 +500,8 @@ ipf_nat_soft_init(softc, arg)
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for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) {
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if (tq->ifq_ttl < softn->ipf_nat_deficmpage)
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tq->ifq_ttl = softn->ipf_nat_deficmpage;
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#ifdef LARGE_NAT
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else if (tq->ifq_ttl > softn->ipf_nat_defage)
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else if (tq->ifq_ttl > softn->ipf_nat_defage && softc->ipf_large_nat)
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tq->ifq_ttl = softn->ipf_nat_defage;
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#endif
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}
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/*
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@ -6141,10 +6147,8 @@ ipf_nat_log(softc, softn, nat, action)
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u_int action;
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{
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#ifdef IPFILTER_LOG
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# ifndef LARGE_NAT
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struct ipnat *np;
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int rulen;
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# endif
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struct natlog natl;
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void *items[1];
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size_t sizes[1];
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@ -6180,8 +6184,7 @@ ipf_nat_log(softc, softn, nat, action)
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bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1],
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sizeof(nat->nat_ifnames[1]));
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# ifndef LARGE_NAT
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if (nat->nat_ptr != NULL) {
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if (softc->ipf_large_nat && nat->nat_ptr != NULL) {
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for (rulen = 0, np = softn->ipf_nat_list; np != NULL;
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np = np->in_next, rulen++)
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if (np == nat->nat_ptr) {
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@ -6189,7 +6192,6 @@ ipf_nat_log(softc, softn, nat, action)
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break;
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}
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}
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# endif
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items[0] = &natl;
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sizes[0] = sizeof(natl);
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types[0] = 0;
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@ -34,44 +34,44 @@
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* appropriate sizes. The figures below were used for
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* a setup with 1000-2000 networks to NAT.
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*/
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#ifndef NAT_SIZE
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# ifdef LARGE_NAT
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# define NAT_SIZE 2047
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# else
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# define NAT_SIZE 127
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# endif
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#ifdef NAT_SIZE
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# define NAT_SIZE_LARGE NAT_SIZE
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# define NAT_SIZE_NORMAL NAT_SIZE
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#else
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# define NAT_SIZE_LARGE 2047
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# define NAT_SIZE_NORMAL 127
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#endif
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#ifndef RDR_SIZE
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# ifdef LARGE_NAT
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# define RDR_SIZE 2047
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# else
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# define RDR_SIZE 127
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# endif
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#ifdef RDR_SIZE
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# define RDR_SIZE_LARGE RDR_SIZE
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# define RDR_SIZE_NORMAL RDR_SIZE
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#else
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# define RDR_SIZE_LARGE 2047
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# define RDR_SIZE_NORMAL 127
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#endif
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#ifndef HOSTMAP_SIZE
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# ifdef LARGE_NAT
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# define HOSTMAP_SIZE 8191
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# else
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# define HOSTMAP_SIZE 2047
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# endif
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#ifdef HOSTMAP_SIZE
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# define HOSTMAP_SIZE_LARGE HOSTMAP_SIZE
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# define HOSTMAP_SIZE_NORMAL HOSTMAP_SIZE
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#else
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# define HOSTMAP_SIZE_LARGE 8191
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# define HOSTMAP_SIZE_NORMAL 2047
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#endif
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#ifndef NAT_TABLE_MAX
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/*
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* This is newly introduced and for the sake of "least surprise", the numbers
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* present aren't what we'd normally use for creating a proper hash table.
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*/
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# ifdef LARGE_NAT
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# define NAT_TABLE_MAX 180000
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# else
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# define NAT_TABLE_MAX 30000
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# endif
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#ifdef NAT_TABLE_MAX
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# define NAT_TABLE_MAX_LARGE NAT_TABLE_MAX
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# define NAT_TABLE_MAX_NORMAL NAT_TABLE_MAX
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#else
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# define NAT_TABLE_MAX_LARGE 180000
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# define NAT_TABLE_MAX_NORMAL 30000
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#endif
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#ifndef NAT_TABLE_SZ
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# ifdef LARGE_NAT
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# define NAT_TABLE_SZ 16383
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# else
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# define NAT_TABLE_SZ 2047
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# endif
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#ifdef NAT_TABLE_SZ
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# define NAT_TABLE_SZ_LARGE NAT_TABLE_SZ
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# define NAT_TABLE_SZ_NORMAL NAT_TABLE_SZ
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#else
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# define NAT_TABLE_SZ_LARGE 16383
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# define NAT_TABLE_SZ_NORMAL 2047
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#endif
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#ifndef APR_LABELLEN
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#define APR_LABELLEN 16
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@ -80,6 +80,11 @@ static int ipfread(dev_t, struct uio *, int);
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static int ipfwrite(dev_t, struct uio *, int);
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#endif
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#ifdef LARGE_NAT
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#define IPF_LARGE_NAT 1
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#else
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#define IPF_LARGE_NAT 0
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#endif
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SYSCTL_DECL(_net_inet);
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#define SYSCTL_IPF(parent, nbr, name, access, ptr, val, descr) \
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@ -132,6 +137,7 @@ SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_running, CTLFLAG_RD,
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&VNET_NAME(ipfmain.ipf_running), 0, "IPF is running");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_chksrc, CTLFLAG_RW, &VNET_NAME(ipfmain.ipf_chksrc), 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_minttl, CTLFLAG_RW, &VNET_NAME(ipfmain.ipf_minttl), 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, large_nat, CTLFLAG_RD, &VNET_NAME(ipfmain.ipf_large_nat), 0, "large_nat");
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#define CDEV_MAJOR 79
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#include <sys/poll.h>
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@ -646,4 +652,3 @@ ipf_fbsd_sysctl_destroy(void)
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}
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return 0;
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}
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