/* $NetBSD: ipnat.c,v 1.4 2021/04/12 04:09:26 mrg Exp $ */ /* * Copyright (C) 2012 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com) */ #include #include #include #include #include #if !defined(__SVR4) && !defined(__svr4__) #include #else #include #endif #include #include #include #include #include #include #define _KERNEL #include #undef _KERNEL #include #include #if defined(sun) && (defined(__svr4__) || defined(__SVR4)) # include # include #endif #include #include #include #include #include #if __FreeBSD_version >= 300000 # include #endif #include #include #include #include #include #if defined(linux) # include #else # include #endif #include "ipf.h" #include "netinet/ipl.h" #include "kmem.h" #ifdef __hpux # define nlist nlist64 #endif #if defined(sun) && !SOLARIS2 # define STRERROR(x) sys_errlist[x] extern char *sys_errlist[]; #else # define STRERROR(x) strerror(x) #endif #if !defined(lint) static __attribute__((__used__)) const char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed"; static __attribute__((__used__)) const char rcsid[] = "@(#)Id: ipnat.c,v 1.1.1.2 2012/07/22 13:44:56 darrenr Exp $"; #endif #if SOLARIS #define bzero(a,b) memset(a,0,b) #endif int use_inet6 = 0; extern char *optarg; void dostats __P((int, natstat_t *, int, int, int *)); void dotable __P((natstat_t *, int, int, int, char *)); void flushtable __P((int, int, int *)); void usage __P((char *)); int main __P((int, char*[])); void showhostmap __P((natstat_t *nsp)); void natstat_dead __P((natstat_t *, char *)); void dostats_live __P((int, natstat_t *, int, int *)); void showhostmap_dead __P((natstat_t *)); void showhostmap_live __P((int, natstat_t *)); void dostats_dead __P((natstat_t *, int, int *)); int nat_matcharray __P((nat_t *, int *)); int opts; int nohdrfields = 0; wordtab_t *nat_fields = NULL; void usage(name) char *name; { fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name); exit(1); } int main(argc, argv) int argc; char *argv[]; { int fd, c, mode, *natfilter; char *file, *core, *kernel; natstat_t ns, *nsp; ipfobj_t obj; fd = -1; opts = 0; nsp = &ns; file = NULL; core = NULL; kernel = NULL; mode = O_RDWR; natfilter = NULL; assigndefined(getenv("IPNAT_PREDEFINED")); while ((c = getopt(argc, argv, "CdFf:hlm:M:N:nO:prRsv")) != -1) switch (c) { case 'C' : opts |= OPT_CLEAR; break; case 'd' : opts |= OPT_DEBUG; break; case 'f' : file = optarg; break; case 'F' : opts |= OPT_FLUSH; break; case 'h' : opts |=OPT_HITS; break; case 'l' : opts |= OPT_LIST; mode = O_RDONLY; break; case 'm' : natfilter = parseipfexpr(optarg, NULL); break; case 'M' : core = optarg; break; case 'N' : kernel = optarg; break; case 'n' : opts |= OPT_DONOTHING|OPT_DONTOPEN; mode = O_RDONLY; break; case 'O' : nat_fields = parsefields(natfields, optarg); break; case 'p' : opts |= OPT_PURGE; break; case 'R' : opts |= OPT_NORESOLVE; break; case 'r' : opts |= OPT_REMOVE; break; case 's' : opts |= OPT_STAT; mode = O_RDONLY; break; case 'v' : opts |= OPT_VERBOSE; break; default : usage(argv[0]); } if (((opts & OPT_PURGE) != 0) && ((opts & OPT_REMOVE) == 0)) { (void) fprintf(stderr, "%s: -p must be used with -r\n", argv[0]); exit(1); } initparse(); if ((kernel != NULL) || (core != NULL)) { (void) setgid(getgid()); (void) setuid(getuid()); } if (!(opts & OPT_DONOTHING)) { if (((fd = open(IPNAT_NAME, mode)) == -1) && ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) { (void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME, STRERROR(errno)); exit(1); } } bzero((char *)&ns, sizeof(ns)); if ((opts & OPT_DONOTHING) == 0) { if (checkrev(IPL_NAME) == -1) { fprintf(stderr, "User/kernel version check failed\n"); exit(1); } } if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) { bzero((char *)&obj, sizeof(obj)); obj.ipfo_rev = IPFILTER_VERSION; obj.ipfo_type = IPFOBJ_NATSTAT; obj.ipfo_size = sizeof(*nsp); obj.ipfo_ptr = (void *)nsp; if (ioctl(fd, SIOCGNATS, &obj) == -1) { ipferror(fd, "ioctl(SIOCGNATS)"); exit(1); } (void) setgid(getgid()); (void) setuid(getuid()); } else if ((kernel != NULL) || (core != NULL)) { if (openkmem(kernel, core) == -1) exit(1); natstat_dead(nsp, kernel); if (opts & (OPT_LIST|OPT_STAT)) dostats(fd, nsp, opts, 0, natfilter); exit(0); } if (opts & (OPT_FLUSH|OPT_CLEAR)) flushtable(fd, opts, natfilter); if (file) { return ipnat_parsefile(fd, ipnat_addrule, ioctl, file); } if (opts & (OPT_LIST|OPT_STAT)) dostats(fd, nsp, opts, 1, natfilter); return 0; } /* * Read NAT statistic information in using a symbol table and memory file * rather than doing ioctl's. */ void natstat_dead(nsp, kernel) natstat_t *nsp; char *kernel; { struct nlist nat_nlist[10] = { { "nat_table" }, /* 0 */ { "nat_list" }, { "maptable" }, { "ipf_nattable_sz" }, { "ipf_natrules_sz" }, { "ipf_rdrrules_sz" }, /* 5 */ { "ipf_hostmap_sz" }, { "nat_instances" }, { NULL } }; void *tables[2]; if (nlist(kernel, nat_nlist) == -1) { fprintf(stderr, "nlist error\n"); return; } /* * Normally the ioctl copies all of these values into the structure * for us, before returning it to userland, so here we must copy each * one in individually. */ kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables)); nsp->ns_side[0].ns_table = tables[0]; nsp->ns_side[1].ns_table = tables[1]; kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value, sizeof(nsp->ns_list)); kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value, sizeof(nsp->ns_maptable)); kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value, sizeof(nsp->ns_nattab_sz)); kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value, sizeof(nsp->ns_rultab_sz)); kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value, sizeof(nsp->ns_rdrtab_sz)); kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value, sizeof(nsp->ns_hostmap_sz)); kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value, sizeof(nsp->ns_instances)); } /* * Issue an ioctl to flush either the NAT rules table or the active mapping * table or both. */ void flushtable(fd, opts, match) int fd, opts, *match; { int n = 0; if (opts & OPT_FLUSH) { n = 0; if (!(opts & OPT_DONOTHING)) { if (match != NULL) { ipfobj_t obj; obj.ipfo_rev = IPFILTER_VERSION; obj.ipfo_size = match[0] * sizeof(int); obj.ipfo_type = IPFOBJ_IPFEXPR; obj.ipfo_ptr = match; if (ioctl(fd, SIOCMATCHFLUSH, &obj) == -1) { ipferror(fd, "ioctl(SIOCMATCHFLUSH)"); n = -1; } else { n = obj.ipfo_retval; } } else if (ioctl(fd, SIOCIPFFL, &n) == -1) { ipferror(fd, "ioctl(SIOCIPFFL)"); n = -1; } } if (n >= 0) printf("%d entries flushed from NAT table\n", n); } if (opts & OPT_CLEAR) { n = 1; if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1) ipferror(fd, "ioctl(SIOCCNATL)"); else printf("%d entries flushed from NAT list\n", n); } } /* * Display NAT statistics. */ void dostats_dead(nsp, opts, filter) natstat_t *nsp; int opts, *filter; { nat_t *np, nat; ipnat_t ipn; int i; if (nat_fields == NULL) { printf("List of active MAP/Redirect filters:\n"); while (nsp->ns_list) { if (kmemcpy((char *)&ipn, (long)nsp->ns_list, sizeof(ipn))) { perror("kmemcpy"); break; } if (opts & OPT_HITS) printf("%lu ", ipn.in_hits); printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE)); nsp->ns_list = ipn.in_next; } } if (nat_fields == NULL) { printf("\nList of active sessions:\n"); } else if (nohdrfields == 0) { for (i = 0; nat_fields[i].w_value != 0; i++) { printfieldhdr(natfields, nat_fields + i); if (nat_fields[i + 1].w_value != 0) printf("\t"); } printf("\n"); } for (np = nsp->ns_instances; np; np = nat.nat_next) { if (kmemcpy((char *)&nat, (long)np, sizeof(nat))) break; if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0)) continue; if (nat_fields != NULL) { for (i = 0; nat_fields[i].w_value != 0; i++) { printnatfield(&nat, nat_fields[i].w_value); if (nat_fields[i + 1].w_value != 0) printf("\t"); } printf("\n"); } else { printactivenat(&nat, opts, nsp->ns_ticks); if (nat.nat_aps) { int proto; if (nat.nat_dir & NAT_OUTBOUND) proto = nat.nat_pr[1]; else proto = nat.nat_pr[0]; printaps(nat.nat_aps, opts, proto); } } } if (opts & OPT_VERBOSE) showhostmap_dead(nsp); } void dotable(nsp, fd, alive, which, side) natstat_t *nsp; int fd, alive, which; char *side; { int sz, i, used, maxlen, minlen, totallen; ipftable_t table; u_int *buckets; ipfobj_t obj; sz = sizeof(*buckets) * nsp->ns_nattab_sz; buckets = (u_int *)malloc(sz); if (buckets == NULL) { fprintf(stderr, "cannot allocate memory (%d) for buckets\n", sz); return; } obj.ipfo_rev = IPFILTER_VERSION; obj.ipfo_type = IPFOBJ_GTABLE; obj.ipfo_size = sizeof(table); obj.ipfo_ptr = &table; if (which == 0) { table.ita_type = IPFTABLE_BUCKETS_NATIN; } else if (which == 1) { table.ita_type = IPFTABLE_BUCKETS_NATOUT; } table.ita_table = buckets; if (alive) { if (ioctl(fd, SIOCGTABL, &obj) != 0) { ipferror(fd, "SIOCFTABL"); free(buckets); return; } } else { if (kmemcpy((char *)buckets, (u_long)nsp->ns_nattab_sz, sz)) { free(buckets); return; } } minlen = nsp->ns_side[which].ns_inuse; totallen = 0; maxlen = 0; used = 0; for (i = 0; i < nsp->ns_nattab_sz; i++) { if (buckets[i] > maxlen) maxlen = buckets[i]; if (buckets[i] < minlen) minlen = buckets[i]; if (buckets[i] != 0) used++; totallen += buckets[i]; } printf("%d%%\thash efficiency %s\n", totallen ? used * 100 / totallen : 0, side); printf("%2.2f%%\tbucket usage %s\n", ((float)used / nsp->ns_nattab_sz) * 100.0, side); printf("%d\tminimal length %s\n", minlen, side); printf("%d\tmaximal length %s\n", maxlen, side); printf("%.3f\taverage length %s\n", used ? ((float)totallen / used) : 0.0, side); free(buckets); } void dostats(fd, nsp, opts, alive, filter) natstat_t *nsp; int fd, opts, alive, *filter; { /* * Show statistics ? */ if (opts & OPT_STAT) { printnatside("in", &nsp->ns_side[0]); dotable(nsp, fd, alive, 0, "in"); printnatside("out", &nsp->ns_side[1]); dotable(nsp, fd, alive, 1, "out"); printf("%lu\tlog successes\n", nsp->ns_side[0].ns_log); printf("%lu\tlog failures\n", nsp->ns_side[1].ns_log); printf("%lu\tadded in\n%lu\tadded out\n", nsp->ns_side[0].ns_added, nsp->ns_side[1].ns_added); printf("%u\tactive\n", nsp->ns_active); printf("%lu\ttransparent adds\n", nsp->ns_addtrpnt); printf("%lu\tdivert build\n", nsp->ns_divert_build); printf("%lu\texpired\n", nsp->ns_expire); printf("%lu\tflush all\n", nsp->ns_flush_all); printf("%lu\tflush closing\n", nsp->ns_flush_closing); printf("%lu\tflush queue\n", nsp->ns_flush_queue); printf("%lu\tflush state\n", nsp->ns_flush_state); printf("%lu\tflush timeout\n", nsp->ns_flush_timeout); printf("%lu\thostmap new\n", nsp->ns_hm_new); printf("%lu\thostmap fails\n", nsp->ns_hm_newfail); printf("%lu\thostmap add\n", nsp->ns_hm_addref); printf("%lu\thostmap NULL rule\n", nsp->ns_hm_nullnp); printf("%lu\tlog ok\n", nsp->ns_log_ok); printf("%lu\tlog fail\n", nsp->ns_log_fail); printf("%u\torphan count\n", nsp->ns_orphans); printf("%u\trule count\n", nsp->ns_rules); printf("%u\tmap rules\n", nsp->ns_rules_map); printf("%u\trdr rules\n", nsp->ns_rules_rdr); printf("%u\twilds\n", nsp->ns_wilds); if (opts & OPT_VERBOSE) printf("list %p\n", nsp->ns_list); } if (opts & OPT_LIST) { if (alive) dostats_live(fd, nsp, opts, filter); else dostats_dead(nsp, opts, filter); } } /* * Display NAT statistics. */ void dostats_live(fd, nsp, opts, filter) natstat_t *nsp; int fd, opts, *filter; { ipfgeniter_t iter; char buffer[2000]; ipfobj_t obj; ipnat_t *ipn; nat_t nat; int i; bzero((char *)&obj, sizeof(obj)); obj.ipfo_rev = IPFILTER_VERSION; obj.ipfo_type = IPFOBJ_GENITER; obj.ipfo_size = sizeof(iter); obj.ipfo_ptr = &iter; iter.igi_type = IPFGENITER_IPNAT; iter.igi_nitems = 1; iter.igi_data = buffer; ipn = (ipnat_t *)buffer; /* * Show list of NAT rules and NAT sessions ? */ if (nat_fields == NULL) { printf("List of active MAP/Redirect filters:\n"); while (nsp->ns_list) { if (ioctl(fd, SIOCGENITER, &obj) == -1) break; if (opts & OPT_HITS) printf("%lu ", ipn->in_hits); printnat(ipn, opts & (OPT_DEBUG|OPT_VERBOSE)); nsp->ns_list = ipn->in_next; } } if (nat_fields == NULL) { printf("\nList of active sessions:\n"); } else if (nohdrfields == 0) { for (i = 0; nat_fields[i].w_value != 0; i++) { printfieldhdr(natfields, nat_fields + i); if (nat_fields[i + 1].w_value != 0) printf("\t"); } printf("\n"); } i = IPFGENITER_IPNAT; (void) ioctl(fd,SIOCIPFDELTOK, &i); iter.igi_type = IPFGENITER_NAT; iter.igi_nitems = 1; iter.igi_data = &nat; while (nsp->ns_instances != NULL) { if (ioctl(fd, SIOCGENITER, &obj) == -1) break; if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0)) continue; if (nat_fields != NULL) { for (i = 0; nat_fields[i].w_value != 0; i++) { printnatfield(&nat, nat_fields[i].w_value); if (nat_fields[i + 1].w_value != 0) printf("\t"); } printf("\n"); } else { printactivenat(&nat, opts, nsp->ns_ticks); if (nat.nat_aps) { int proto; if (nat.nat_dir & NAT_OUTBOUND) proto = nat.nat_pr[1]; else proto = nat.nat_pr[0]; printaps(nat.nat_aps, opts, proto); } } nsp->ns_instances = nat.nat_next; } if (opts & OPT_VERBOSE) showhostmap_live(fd, nsp); i = IPFGENITER_NAT; (void) ioctl(fd,SIOCIPFDELTOK, &i); } /* * Display the active host mapping table. */ void showhostmap_dead(nsp) natstat_t *nsp; { hostmap_t hm, *hmp, **maptable; u_int hv; printf("\nList of active host mappings:\n"); maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) * nsp->ns_hostmap_sz); if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable, sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) { perror("kmemcpy (maptable)"); return; } for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) { hmp = maptable[hv]; while (hmp) { if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) { perror("kmemcpy (hostmap)"); return; } printhostmap(&hm, hv); hmp = hm.hm_next; } } free(maptable); } /* * Display the active host mapping table. */ void showhostmap_live(fd, nsp) int fd; natstat_t *nsp; { ipfgeniter_t iter; hostmap_t hm; ipfobj_t obj; int i; bzero((char *)&obj, sizeof(obj)); obj.ipfo_rev = IPFILTER_VERSION; obj.ipfo_type = IPFOBJ_GENITER; obj.ipfo_size = sizeof(iter); obj.ipfo_ptr = &iter; iter.igi_type = IPFGENITER_HOSTMAP; iter.igi_nitems = 1; iter.igi_data = &hm; printf("\nList of active host mappings:\n"); while (nsp->ns_maplist != NULL) { if (ioctl(fd, SIOCGENITER, &obj) == -1) break; printhostmap(&hm, hm.hm_hv); nsp->ns_maplist = hm.hm_next; } i = IPFGENITER_HOSTMAP; (void) ioctl(fd,SIOCIPFDELTOK, &i); } int nat_matcharray(nat, array) nat_t *nat; int *array; { int i, n, *x, rv, p; ipfexp_t *e; rv = 0; n = array[0]; x = array + 1; for (; n > 0; x += 3 + x[3], rv = 0) { e = (ipfexp_t *)x; if (e->ipfe_cmd == IPF_EXP_END) break; n -= e->ipfe_size; p = e->ipfe_cmd >> 16; if ((p != 0) && (p != nat->nat_pr[1])) break; switch (e->ipfe_cmd) { case IPF_EXP_IP_PR : for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= (nat->nat_pr[1] == e->ipfe_arg0[i]); } break; case IPF_EXP_IP_SRCADDR : if (nat->nat_v[0] != 4) break; for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= ((nat->nat_osrcaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]) || ((nat->nat_nsrcaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]); } break; case IPF_EXP_IP_DSTADDR : if (nat->nat_v[0] != 4) break; for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= ((nat->nat_odstaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]) || ((nat->nat_ndstaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]); } break; case IPF_EXP_IP_ADDR : if (nat->nat_v[0] != 4) break; for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= ((nat->nat_osrcaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]) || ((nat->nat_nsrcaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]) || ((nat->nat_odstaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]) || ((nat->nat_ndstaddr & e->ipfe_arg0[i * 2 + 1]) == e->ipfe_arg0[i * 2]); } break; #ifdef USE_INET6 case IPF_EXP_IP6_SRCADDR : if (nat->nat_v[0] != 6) break; for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= IP6_MASKEQ(&nat->nat_osrc6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]) || IP6_MASKEQ(&nat->nat_nsrc6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]); } break; case IPF_EXP_IP6_DSTADDR : if (nat->nat_v[0] != 6) break; for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= IP6_MASKEQ(&nat->nat_odst6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]) || IP6_MASKEQ(&nat->nat_ndst6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]); } break; case IPF_EXP_IP6_ADDR : if (nat->nat_v[0] != 6) break; for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= IP6_MASKEQ(&nat->nat_osrc6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]) || IP6_MASKEQ(&nat->nat_nsrc6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]) || IP6_MASKEQ(&nat->nat_odst6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]) || IP6_MASKEQ(&nat->nat_ndst6, &e->ipfe_arg0[i * 8 + 4], &e->ipfe_arg0[i * 8]); } break; #endif case IPF_EXP_UDP_PORT : case IPF_EXP_TCP_PORT : for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= (nat->nat_osport == e->ipfe_arg0[i]) || (nat->nat_nsport == e->ipfe_arg0[i]) || (nat->nat_odport == e->ipfe_arg0[i]) || (nat->nat_ndport == e->ipfe_arg0[i]); } break; case IPF_EXP_UDP_SPORT : case IPF_EXP_TCP_SPORT : for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= (nat->nat_osport == e->ipfe_arg0[i]) || (nat->nat_nsport == e->ipfe_arg0[i]); } break; case IPF_EXP_UDP_DPORT : case IPF_EXP_TCP_DPORT : for (i = 0; !rv && i < e->ipfe_narg; i++) { rv |= (nat->nat_odport == e->ipfe_arg0[i]) || (nat->nat_ndport == e->ipfe_arg0[i]); } break; } rv ^= e->ipfe_not; if (rv == 0) break; } return rv; }