/* * Copyright (c) 2002-2003 Luigi Rizzo * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp * Copyright (c) 1994 Ugen J.S.Antsilevich * * Idea and grammar partially left from: * Copyright (c) 1993 Daniel Boulet * * Redistribution and use in source forms, with and without modification, * are permitted provided that this entire comment appears intact. * * Redistribution in binary form may occur without any restrictions. * Obviously, it would be nice if you gave credit where credit is due * but requiring it would be too onerous. * * This software is provided ``AS IS'' without any warranties of any kind. * * NEW command line interface for IP firewall facility * * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX do we need this ? */ #include #include #include #include #include #include #include #include /* def. of struct route */ #include #include #include #include #include #include #include #include #include #include int do_resolv, /* Would try to resolve all */ do_time, /* Show time stamps */ do_quiet, /* Be quiet in add and flush */ do_pipe, /* this cmd refers to a pipe */ do_nat, /* Nat configuration. */ do_sort, /* field to sort results (0 = no) */ do_dynamic, /* display dynamic rules */ do_expired, /* display expired dynamic rules */ do_compact, /* show rules in compact mode */ do_force, /* do not ask for confirmation */ show_sets, /* display rule sets */ test_only, /* only check syntax */ comment_only, /* only print action and comment */ verbose; #define IP_MASK_ALL 0xffffffff /* * the following macro returns an error message if we run out of * arguments. */ #define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ if (!ac) \ errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ if (_substrcmp(*av, "tablearg") == 0) { \ arg = IP_FW_TABLEARG; \ break; \ } \ \ { \ long val; \ char *end; \ \ val = strtol(*av, &end, 10); \ \ if (!isdigit(**av) || *end != '\0' || (val == 0 && errno == EINVAL)) \ errx(EX_DATAERR, "%s: invalid argument: %s", \ match_value(s_x, tok), *av); \ \ if (errno == ERANGE || val < min || val > max) \ errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ match_value(s_x, tok), min, max, *av); \ \ if (val == IP_FW_TABLEARG) \ errx(EX_DATAERR, "%s: illegal argument value: %s", \ match_value(s_x, tok), *av); \ arg = val; \ } \ } while (0) #define PRINT_UINT_ARG(str, arg) do { \ if (str != NULL) \ printf("%s",str); \ if (arg == IP_FW_TABLEARG) \ printf("tablearg"); \ else \ printf("%u", (uint32_t)arg); \ } while (0) /* * _s_x is a structure that stores a string <-> token pairs, used in * various places in the parser. Entries are stored in arrays, * with an entry with s=NULL as terminator. * The search routines are match_token() and match_value(). * Often, an element with x=0 contains an error string. * */ struct _s_x { char const *s; int x; }; static struct _s_x f_tcpflags[] = { { "syn", TH_SYN }, { "fin", TH_FIN }, { "ack", TH_ACK }, { "psh", TH_PUSH }, { "rst", TH_RST }, { "urg", TH_URG }, { "tcp flag", 0 }, { NULL, 0 } }; static struct _s_x f_tcpopts[] = { { "mss", IP_FW_TCPOPT_MSS }, { "maxseg", IP_FW_TCPOPT_MSS }, { "window", IP_FW_TCPOPT_WINDOW }, { "sack", IP_FW_TCPOPT_SACK }, { "ts", IP_FW_TCPOPT_TS }, { "timestamp", IP_FW_TCPOPT_TS }, { "cc", IP_FW_TCPOPT_CC }, { "tcp option", 0 }, { NULL, 0 } }; /* * IP options span the range 0 to 255 so we need to remap them * (though in fact only the low 5 bits are significant). */ static struct _s_x f_ipopts[] = { { "ssrr", IP_FW_IPOPT_SSRR}, { "lsrr", IP_FW_IPOPT_LSRR}, { "rr", IP_FW_IPOPT_RR}, { "ts", IP_FW_IPOPT_TS}, { "ip option", 0 }, { NULL, 0 } }; static struct _s_x f_iptos[] = { { "lowdelay", IPTOS_LOWDELAY}, { "throughput", IPTOS_THROUGHPUT}, { "reliability", IPTOS_RELIABILITY}, { "mincost", IPTOS_MINCOST}, { "congestion", IPTOS_CE}, { "ecntransport", IPTOS_ECT}, { "ip tos option", 0}, { NULL, 0 } }; static struct _s_x limit_masks[] = { {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, {"src-addr", DYN_SRC_ADDR}, {"src-port", DYN_SRC_PORT}, {"dst-addr", DYN_DST_ADDR}, {"dst-port", DYN_DST_PORT}, {NULL, 0} }; /* * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines * This is only used in this code. */ #define IPPROTO_ETHERTYPE 0x1000 static struct _s_x ether_types[] = { /* * Note, we cannot use "-:&/" in the names because they are field * separators in the type specifications. Also, we use s = NULL as * end-delimiter, because a type of 0 can be legal. */ { "ip", 0x0800 }, { "ipv4", 0x0800 }, { "ipv6", 0x86dd }, { "arp", 0x0806 }, { "rarp", 0x8035 }, { "vlan", 0x8100 }, { "loop", 0x9000 }, { "trail", 0x1000 }, { "at", 0x809b }, { "atalk", 0x809b }, { "aarp", 0x80f3 }, { "pppoe_disc", 0x8863 }, { "pppoe_sess", 0x8864 }, { "ipx_8022", 0x00E0 }, { "ipx_8023", 0x0000 }, { "ipx_ii", 0x8137 }, { "ipx_snap", 0x8137 }, { "ipx", 0x8137 }, { "ns", 0x0600 }, { NULL, 0 } }; static void show_usage(void); enum tokens { TOK_NULL=0, TOK_OR, TOK_NOT, TOK_STARTBRACE, TOK_ENDBRACE, TOK_ACCEPT, TOK_COUNT, TOK_PIPE, TOK_QUEUE, TOK_DIVERT, TOK_TEE, TOK_NETGRAPH, TOK_NGTEE, TOK_FORWARD, TOK_SKIPTO, TOK_DENY, TOK_REJECT, TOK_RESET, TOK_UNREACH, TOK_CHECKSTATE, TOK_NAT, TOK_ALTQ, TOK_LOG, TOK_TAG, TOK_UNTAG, TOK_TAGGED, TOK_UID, TOK_GID, TOK_JAIL, TOK_IN, TOK_LIMIT, TOK_KEEPSTATE, TOK_LAYER2, TOK_OUT, TOK_DIVERTED, TOK_DIVERTEDLOOPBACK, TOK_DIVERTEDOUTPUT, TOK_XMIT, TOK_RECV, TOK_VIA, TOK_FRAG, TOK_IPOPTS, TOK_IPLEN, TOK_IPID, TOK_IPPRECEDENCE, TOK_IPTOS, TOK_IPTTL, TOK_IPVER, TOK_ESTAB, TOK_SETUP, TOK_TCPDATALEN, TOK_TCPFLAGS, TOK_TCPOPTS, TOK_TCPSEQ, TOK_TCPACK, TOK_TCPWIN, TOK_ICMPTYPES, TOK_MAC, TOK_MACTYPE, TOK_VERREVPATH, TOK_VERSRCREACH, TOK_ANTISPOOF, TOK_IPSEC, TOK_COMMENT, TOK_PLR, TOK_NOERROR, TOK_BUCKETS, TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT, TOK_ALL, TOK_MASK, TOK_BW, TOK_DELAY, TOK_RED, TOK_GRED, TOK_DROPTAIL, TOK_PROTO, TOK_WEIGHT, TOK_IP, TOK_IF, TOK_ALOG, TOK_DENY_INC, TOK_SAME_PORTS, TOK_UNREG_ONLY, TOK_RESET_ADDR, TOK_ALIAS_REV, TOK_PROXY_ONLY, TOK_REDIR_ADDR, TOK_REDIR_PORT, TOK_REDIR_PROTO, TOK_IPV6, TOK_FLOWID, TOK_ICMP6TYPES, TOK_EXT6HDR, TOK_DSTIP6, TOK_SRCIP6, TOK_IPV4, TOK_UNREACH6, TOK_RESET6, }; struct _s_x dummynet_params[] = { { "plr", TOK_PLR }, { "noerror", TOK_NOERROR }, { "buckets", TOK_BUCKETS }, { "dst-ip", TOK_DSTIP }, { "src-ip", TOK_SRCIP }, { "dst-port", TOK_DSTPORT }, { "src-port", TOK_SRCPORT }, { "proto", TOK_PROTO }, { "weight", TOK_WEIGHT }, { "all", TOK_ALL }, { "mask", TOK_MASK }, { "droptail", TOK_DROPTAIL }, { "red", TOK_RED }, { "gred", TOK_GRED }, { "bw", TOK_BW }, { "bandwidth", TOK_BW }, { "delay", TOK_DELAY }, { "pipe", TOK_PIPE }, { "queue", TOK_QUEUE }, { "flow-id", TOK_FLOWID}, { "dst-ipv6", TOK_DSTIP6}, { "dst-ip6", TOK_DSTIP6}, { "src-ipv6", TOK_SRCIP6}, { "src-ip6", TOK_SRCIP6}, { "dummynet-params", TOK_NULL }, { NULL, 0 } /* terminator */ }; struct _s_x nat_params[] = { { "ip", TOK_IP }, { "if", TOK_IF }, { "log", TOK_ALOG }, { "deny_in", TOK_DENY_INC }, { "same_ports", TOK_SAME_PORTS }, { "unreg_only", TOK_UNREG_ONLY }, { "reset", TOK_RESET_ADDR }, { "reverse", TOK_ALIAS_REV }, { "proxy_only", TOK_PROXY_ONLY }, { "redirect_addr", TOK_REDIR_ADDR }, { "redirect_port", TOK_REDIR_PORT }, { "redirect_proto", TOK_REDIR_PROTO }, { NULL, 0 } /* terminator */ }; struct _s_x rule_actions[] = { { "accept", TOK_ACCEPT }, { "pass", TOK_ACCEPT }, { "allow", TOK_ACCEPT }, { "permit", TOK_ACCEPT }, { "count", TOK_COUNT }, { "pipe", TOK_PIPE }, { "queue", TOK_QUEUE }, { "divert", TOK_DIVERT }, { "tee", TOK_TEE }, { "netgraph", TOK_NETGRAPH }, { "ngtee", TOK_NGTEE }, { "fwd", TOK_FORWARD }, { "forward", TOK_FORWARD }, { "skipto", TOK_SKIPTO }, { "deny", TOK_DENY }, { "drop", TOK_DENY }, { "reject", TOK_REJECT }, { "reset6", TOK_RESET6 }, { "reset", TOK_RESET }, { "unreach6", TOK_UNREACH6 }, { "unreach", TOK_UNREACH }, { "check-state", TOK_CHECKSTATE }, { "//", TOK_COMMENT }, { "nat", TOK_NAT }, { NULL, 0 } /* terminator */ }; struct _s_x rule_action_params[] = { { "altq", TOK_ALTQ }, { "log", TOK_LOG }, { "tag", TOK_TAG }, { "untag", TOK_UNTAG }, { NULL, 0 } /* terminator */ }; struct _s_x rule_options[] = { { "tagged", TOK_TAGGED }, { "uid", TOK_UID }, { "gid", TOK_GID }, { "jail", TOK_JAIL }, { "in", TOK_IN }, { "limit", TOK_LIMIT }, { "keep-state", TOK_KEEPSTATE }, { "bridged", TOK_LAYER2 }, { "layer2", TOK_LAYER2 }, { "out", TOK_OUT }, { "diverted", TOK_DIVERTED }, { "diverted-loopback", TOK_DIVERTEDLOOPBACK }, { "diverted-output", TOK_DIVERTEDOUTPUT }, { "xmit", TOK_XMIT }, { "recv", TOK_RECV }, { "via", TOK_VIA }, { "fragment", TOK_FRAG }, { "frag", TOK_FRAG }, { "ipoptions", TOK_IPOPTS }, { "ipopts", TOK_IPOPTS }, { "iplen", TOK_IPLEN }, { "ipid", TOK_IPID }, { "ipprecedence", TOK_IPPRECEDENCE }, { "iptos", TOK_IPTOS }, { "ipttl", TOK_IPTTL }, { "ipversion", TOK_IPVER }, { "ipver", TOK_IPVER }, { "estab", TOK_ESTAB }, { "established", TOK_ESTAB }, { "setup", TOK_SETUP }, { "tcpdatalen", TOK_TCPDATALEN }, { "tcpflags", TOK_TCPFLAGS }, { "tcpflgs", TOK_TCPFLAGS }, { "tcpoptions", TOK_TCPOPTS }, { "tcpopts", TOK_TCPOPTS }, { "tcpseq", TOK_TCPSEQ }, { "tcpack", TOK_TCPACK }, { "tcpwin", TOK_TCPWIN }, { "icmptype", TOK_ICMPTYPES }, { "icmptypes", TOK_ICMPTYPES }, { "dst-ip", TOK_DSTIP }, { "src-ip", TOK_SRCIP }, { "dst-port", TOK_DSTPORT }, { "src-port", TOK_SRCPORT }, { "proto", TOK_PROTO }, { "MAC", TOK_MAC }, { "mac", TOK_MAC }, { "mac-type", TOK_MACTYPE }, { "verrevpath", TOK_VERREVPATH }, { "versrcreach", TOK_VERSRCREACH }, { "antispoof", TOK_ANTISPOOF }, { "ipsec", TOK_IPSEC }, { "icmp6type", TOK_ICMP6TYPES }, { "icmp6types", TOK_ICMP6TYPES }, { "ext6hdr", TOK_EXT6HDR}, { "flow-id", TOK_FLOWID}, { "ipv6", TOK_IPV6}, { "ip6", TOK_IPV6}, { "ipv4", TOK_IPV4}, { "ip4", TOK_IPV4}, { "dst-ipv6", TOK_DSTIP6}, { "dst-ip6", TOK_DSTIP6}, { "src-ipv6", TOK_SRCIP6}, { "src-ip6", TOK_SRCIP6}, { "//", TOK_COMMENT }, { "not", TOK_NOT }, /* pseudo option */ { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ { "or", TOK_OR }, /* pseudo option */ { "|", /* escape */ TOK_OR }, /* pseudo option */ { "{", TOK_STARTBRACE }, /* pseudo option */ { "(", TOK_STARTBRACE }, /* pseudo option */ { "}", TOK_ENDBRACE }, /* pseudo option */ { ")", TOK_ENDBRACE }, /* pseudo option */ { NULL, 0 } /* terminator */ }; #define TABLEARG "tablearg" static __inline uint64_t align_uint64(uint64_t *pll) { uint64_t ret; bcopy (pll, &ret, sizeof(ret)); return ret; } /* * conditionally runs the command. */ static int do_cmd(int optname, void *optval, uintptr_t optlen) { static int s = -1; /* the socket */ int i; if (test_only) return 0; if (s == -1) s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (s < 0) err(EX_UNAVAILABLE, "socket"); if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST || optname == IP_FW_TABLE_GETSIZE || optname == IP_FW_NAT_GET_CONFIG || optname == IP_FW_NAT_GET_LOG) i = getsockopt(s, IPPROTO_IP, optname, optval, (socklen_t *)optlen); else i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); return i; } /** * match_token takes a table and a string, returns the value associated * with the string (-1 in case of failure). */ static int match_token(struct _s_x *table, char *string) { struct _s_x *pt; uint i = strlen(string); for (pt = table ; i && pt->s != NULL ; pt++) if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) return pt->x; return -1; } /** * match_value takes a table and a value, returns the string associated * with the value (NULL in case of failure). */ static char const * match_value(struct _s_x *p, int value) { for (; p->s != NULL; p++) if (p->x == value) return p->s; return NULL; } /* * _substrcmp takes two strings and returns 1 if they do not match, * and 0 if they match exactly or the first string is a sub-string * of the second. A warning is printed to stderr in the case that the * first string is a sub-string of the second. * * This function will be removed in the future through the usual * deprecation process. */ static int _substrcmp(const char *str1, const char* str2) { if (strncmp(str1, str2, strlen(str1)) != 0) return 1; if (strlen(str1) != strlen(str2)) warnx("DEPRECATED: '%s' matched '%s' as a sub-string", str1, str2); return 0; } /* * _substrcmp2 takes three strings and returns 1 if the first two do not match, * and 0 if they match exactly or the second string is a sub-string * of the first. A warning is printed to stderr in the case that the * first string does not match the third. * * This function exists to warn about the bizzare construction * strncmp(str, "by", 2) which is used to allow people to use a shotcut * for "bytes". The problem is that in addition to accepting "by", * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any * other string beginning with "by". * * This function will be removed in the future through the usual * deprecation process. */ static int _substrcmp2(const char *str1, const char* str2, const char* str3) { if (strncmp(str1, str2, strlen(str2)) != 0) return 1; if (strcmp(str1, str3) != 0) warnx("DEPRECATED: '%s' matched '%s'", str1, str3); return 0; } /* * prints one port, symbolic or numeric */ static void print_port(int proto, uint16_t port) { if (proto == IPPROTO_ETHERTYPE) { char const *s; if (do_resolv && (s = match_value(ether_types, port)) ) printf("%s", s); else printf("0x%04x", port); } else { struct servent *se = NULL; if (do_resolv) { struct protoent *pe = getprotobynumber(proto); se = getservbyport(htons(port), pe ? pe->p_name : NULL); } if (se) printf("%s", se->s_name); else printf("%d", port); } } struct _s_x _port_name[] = { {"dst-port", O_IP_DSTPORT}, {"src-port", O_IP_SRCPORT}, {"ipid", O_IPID}, {"iplen", O_IPLEN}, {"ipttl", O_IPTTL}, {"mac-type", O_MAC_TYPE}, {"tcpdatalen", O_TCPDATALEN}, {"tagged", O_TAGGED}, {NULL, 0} }; /* * Print the values in a list 16-bit items of the types above. * XXX todo: add support for mask. */ static void print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) { uint16_t *p = cmd->ports; int i; char const *sep; if (cmd->o.len & F_NOT) printf(" not"); if (opcode != 0) { sep = match_value(_port_name, opcode); if (sep == NULL) sep = "???"; printf (" %s", sep); } sep = " "; for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { printf(sep); print_port(proto, p[0]); if (p[0] != p[1]) { printf("-"); print_port(proto, p[1]); } sep = ","; } } /* * Like strtol, but also translates service names into port numbers * for some protocols. * In particular: * proto == -1 disables the protocol check; * proto == IPPROTO_ETHERTYPE looks up an internal table * proto == matches the values there. * Returns *end == s in case the parameter is not found. */ static int strtoport(char *s, char **end, int base, int proto) { char *p, *buf; char *s1; int i; *end = s; /* default - not found */ if (*s == '\0') return 0; /* not found */ if (isdigit(*s)) return strtol(s, end, base); /* * find separator. '\\' escapes the next char. */ for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) if (*s1 == '\\' && s1[1] != '\0') s1++; buf = malloc(s1 - s + 1); if (buf == NULL) return 0; /* * copy into a buffer skipping backslashes */ for (p = s, i = 0; p != s1 ; p++) if (*p != '\\') buf[i++] = *p; buf[i++] = '\0'; if (proto == IPPROTO_ETHERTYPE) { i = match_token(ether_types, buf); free(buf); if (i != -1) { /* found */ *end = s1; return i; } } else { struct protoent *pe = NULL; struct servent *se; if (proto != 0) pe = getprotobynumber(proto); setservent(1); se = getservbyname(buf, pe ? pe->p_name : NULL); free(buf); if (se != NULL) { *end = s1; return ntohs(se->s_port); } } return 0; /* not found */ } /* * Map between current altq queue id numbers and names. */ static int altq_fetched = 0; static TAILQ_HEAD(, pf_altq) altq_entries = TAILQ_HEAD_INITIALIZER(altq_entries); static void altq_set_enabled(int enabled) { int pffd; pffd = open("/dev/pf", O_RDWR); if (pffd == -1) err(EX_UNAVAILABLE, "altq support opening pf(4) control device"); if (enabled) { if (ioctl(pffd, DIOCSTARTALTQ) != 0 && errno != EEXIST) err(EX_UNAVAILABLE, "enabling altq"); } else { if (ioctl(pffd, DIOCSTOPALTQ) != 0 && errno != ENOENT) err(EX_UNAVAILABLE, "disabling altq"); } close(pffd); } static void altq_fetch() { struct pfioc_altq pfioc; struct pf_altq *altq; int pffd, mnr; if (altq_fetched) return; altq_fetched = 1; pffd = open("/dev/pf", O_RDONLY); if (pffd == -1) { warn("altq support opening pf(4) control device"); return; } bzero(&pfioc, sizeof(pfioc)); if (ioctl(pffd, DIOCGETALTQS, &pfioc) != 0) { warn("altq support getting queue list"); close(pffd); return; } mnr = pfioc.nr; for (pfioc.nr = 0; pfioc.nr < mnr; pfioc.nr++) { if (ioctl(pffd, DIOCGETALTQ, &pfioc) != 0) { if (errno == EBUSY) break; warn("altq support getting queue list"); close(pffd); return; } if (pfioc.altq.qid == 0) continue; altq = malloc(sizeof(*altq)); if (altq == NULL) err(EX_OSERR, "malloc"); *altq = pfioc.altq; TAILQ_INSERT_TAIL(&altq_entries, altq, entries); } close(pffd); } static u_int32_t altq_name_to_qid(const char *name) { struct pf_altq *altq; altq_fetch(); TAILQ_FOREACH(altq, &altq_entries, entries) if (strcmp(name, altq->qname) == 0) break; if (altq == NULL) errx(EX_DATAERR, "altq has no queue named `%s'", name); return altq->qid; } static const char * altq_qid_to_name(u_int32_t qid) { struct pf_altq *altq; altq_fetch(); TAILQ_FOREACH(altq, &altq_entries, entries) if (qid == altq->qid) break; if (altq == NULL) return NULL; return altq->qname; } static void fill_altq_qid(u_int32_t *qid, const char *av) { *qid = altq_name_to_qid(av); } /* * Fill the body of the command with the list of port ranges. */ static int fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) { uint16_t a, b, *p = cmd->ports; int i = 0; char *s = av; while (*s) { a = strtoport(av, &s, 0, proto); if (s == av) /* empty or invalid argument */ return (0); switch (*s) { case '-': /* a range */ av = s + 1; b = strtoport(av, &s, 0, proto); /* Reject expressions like '1-abc' or '1-2-3'. */ if (s == av || (*s != ',' && *s != '\0')) return (0); p[0] = a; p[1] = b; break; case ',': /* comma separated list */ case '\0': p[0] = p[1] = a; break; default: warnx("port list: invalid separator <%c> in <%s>", *s, av); return (0); } i++; p += 2; av = s + 1; } if (i > 0) { if (i + 1 > F_LEN_MASK) errx(EX_DATAERR, "too many ports/ranges\n"); cmd->o.len |= i + 1; /* leave F_NOT and F_OR untouched */ } return (i); } static struct _s_x icmpcodes[] = { { "net", ICMP_UNREACH_NET }, { "host", ICMP_UNREACH_HOST }, { "protocol", ICMP_UNREACH_PROTOCOL }, { "port", ICMP_UNREACH_PORT }, { "needfrag", ICMP_UNREACH_NEEDFRAG }, { "srcfail", ICMP_UNREACH_SRCFAIL }, { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, { "isolated", ICMP_UNREACH_ISOLATED }, { "net-prohib", ICMP_UNREACH_NET_PROHIB }, { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, { "tosnet", ICMP_UNREACH_TOSNET }, { "toshost", ICMP_UNREACH_TOSHOST }, { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, { NULL, 0 } }; static void fill_reject_code(u_short *codep, char *str) { int val; char *s; val = strtoul(str, &s, 0); if (s == str || *s != '\0' || val >= 0x100) val = match_token(icmpcodes, str); if (val < 0) errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); *codep = val; return; } static void print_reject_code(uint16_t code) { char const *s = match_value(icmpcodes, code); if (s != NULL) printf("unreach %s", s); else printf("unreach %u", code); } static struct _s_x icmp6codes[] = { { "no-route", ICMP6_DST_UNREACH_NOROUTE }, { "admin-prohib", ICMP6_DST_UNREACH_ADMIN }, { "address", ICMP6_DST_UNREACH_ADDR }, { "port", ICMP6_DST_UNREACH_NOPORT }, { NULL, 0 } }; static void fill_unreach6_code(u_short *codep, char *str) { int val; char *s; val = strtoul(str, &s, 0); if (s == str || *s != '\0' || val >= 0x100) val = match_token(icmp6codes, str); if (val < 0) errx(EX_DATAERR, "unknown ICMPv6 unreachable code ``%s''", str); *codep = val; return; } static void print_unreach6_code(uint16_t code) { char const *s = match_value(icmp6codes, code); if (s != NULL) printf("unreach6 %s", s); else printf("unreach6 %u", code); } /* * Returns the number of bits set (from left) in a contiguous bitmask, * or -1 if the mask is not contiguous. * XXX this needs a proper fix. * This effectively works on masks in big-endian (network) format. * when compiled on little endian architectures. * * First bit is bit 7 of the first byte -- note, for MAC addresses, * the first bit on the wire is bit 0 of the first byte. * len is the max length in bits. */ static int contigmask(uint8_t *p, int len) { int i, n; for (i=0; iarg1 & 0xff; uint8_t clear = (cmd->arg1 >> 8) & 0xff; if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { printf(" setup"); return; } printf(" %s ", name); for (i=0; list[i].x != 0; i++) { if (set & list[i].x) { set &= ~list[i].x; printf("%s%s", comma, list[i].s); comma = ","; } if (clear & list[i].x) { clear &= ~list[i].x; printf("%s!%s", comma, list[i].s); comma = ","; } } } /* * Print the ip address contained in a command. */ static void print_ip(ipfw_insn_ip *cmd, char const *s) { struct hostent *he = NULL; int len = F_LEN((ipfw_insn *)cmd); uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { printf("me"); return; } if (cmd->o.opcode == O_IP_SRC_LOOKUP || cmd->o.opcode == O_IP_DST_LOOKUP) { printf("table(%u", ((ipfw_insn *)cmd)->arg1); if (len == F_INSN_SIZE(ipfw_insn_u32)) printf(",%u", *a); printf(")"); return; } if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { uint32_t x, *map = (uint32_t *)&(cmd->mask); int i, j; char comma = '{'; x = cmd->o.arg1 - 1; x = htonl( ~x ); cmd->addr.s_addr = htonl(cmd->addr.s_addr); printf("%s/%d", inet_ntoa(cmd->addr), contigmask((uint8_t *)&x, 32)); x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); x &= 0xff; /* base */ /* * Print bits and ranges. * Locate first bit set (i), then locate first bit unset (j). * If we have 3+ consecutive bits set, then print them as a * range, otherwise only print the initial bit and rescan. */ for (i=0; i < cmd->o.arg1; i++) if (map[i/32] & (1<<(i & 31))) { for (j=i+1; j < cmd->o.arg1; j++) if (!(map[ j/32] & (1<<(j & 31)))) break; printf("%c%d", comma, i+x); if (j>i+2) { /* range has at least 3 elements */ printf("-%d", j-1+x); i = j-1; } comma = ','; } printf("}"); return; } /* * len == 2 indicates a single IP, whereas lists of 1 or more * addr/mask pairs have len = (2n+1). We convert len to n so we * use that to count the number of entries. */ for (len = len / 2; len > 0; len--, a += 2) { int mb = /* mask length */ (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 32 : contigmask((uint8_t *)&(a[1]), 32); if (mb == 32 && do_resolv) he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); if (he != NULL) /* resolved to name */ printf("%s", he->h_name); else if (mb == 0) /* any */ printf("any"); else { /* numeric IP followed by some kind of mask */ printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); if (mb < 0) printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); else if (mb < 32) printf("/%d", mb); } if (len > 1) printf(","); } } /* * prints a MAC address/mask pair */ static void print_mac(uint8_t *addr, uint8_t *mask) { int l = contigmask(mask, 48); if (l == 0) printf(" any"); else { printf(" %02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); if (l == -1) printf("&%02x:%02x:%02x:%02x:%02x:%02x", mask[0], mask[1], mask[2], mask[3], mask[4], mask[5]); else if (l < 48) printf("/%d", l); } } static void fill_icmptypes(ipfw_insn_u32 *cmd, char *av) { uint8_t type; cmd->d[0] = 0; while (*av) { if (*av == ',') av++; type = strtoul(av, &av, 0); if (*av != ',' && *av != '\0') errx(EX_DATAERR, "invalid ICMP type"); if (type > 31) errx(EX_DATAERR, "ICMP type out of range"); cmd->d[0] |= 1 << type; } cmd->o.opcode = O_ICMPTYPE; cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); } static void print_icmptypes(ipfw_insn_u32 *cmd) { int i; char sep= ' '; printf(" icmptypes"); for (i = 0; i < 32; i++) { if ( (cmd->d[0] & (1 << (i))) == 0) continue; printf("%c%d", sep, i); sep = ','; } } /* * Print the ip address contained in a command. */ static void print_ip6(ipfw_insn_ip6 *cmd, char const *s) { struct hostent *he = NULL; int len = F_LEN((ipfw_insn *) cmd) - 1; struct in6_addr *a = &(cmd->addr6); char trad[255]; printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); if (cmd->o.opcode == O_IP6_SRC_ME || cmd->o.opcode == O_IP6_DST_ME) { printf("me6"); return; } if (cmd->o.opcode == O_IP6) { printf(" ip6"); return; } /* * len == 4 indicates a single IP, whereas lists of 1 or more * addr/mask pairs have len = (2n+1). We convert len to n so we * use that to count the number of entries. */ for (len = len / 4; len > 0; len -= 2, a += 2) { int mb = /* mask length */ (cmd->o.opcode == O_IP6_SRC || cmd->o.opcode == O_IP6_DST) ? 128 : contigmask((uint8_t *)&(a[1]), 128); if (mb == 128 && do_resolv) he = gethostbyaddr((char *)a, sizeof(*a), AF_INET6); if (he != NULL) /* resolved to name */ printf("%s", he->h_name); else if (mb == 0) /* any */ printf("any"); else { /* numeric IP followed by some kind of mask */ if (inet_ntop(AF_INET6, a, trad, sizeof( trad ) ) == NULL) printf("Error ntop in print_ip6\n"); printf("%s", trad ); if (mb < 0) /* XXX not really legal... */ printf(":%s", inet_ntop(AF_INET6, &a[1], trad, sizeof(trad))); else if (mb < 128) printf("/%d", mb); } if (len > 2) printf(","); } } static void fill_icmp6types(ipfw_insn_icmp6 *cmd, char *av) { uint8_t type; bzero(cmd, sizeof(*cmd)); while (*av) { if (*av == ',') av++; type = strtoul(av, &av, 0); if (*av != ',' && *av != '\0') errx(EX_DATAERR, "invalid ICMP6 type"); /* * XXX: shouldn't this be 0xFF? I can't see any reason why * we shouldn't be able to filter all possiable values * regardless of the ability of the rest of the kernel to do * anything useful with them. */ if (type > ICMP6_MAXTYPE) errx(EX_DATAERR, "ICMP6 type out of range"); cmd->d[type / 32] |= ( 1 << (type % 32)); } cmd->o.opcode = O_ICMP6TYPE; cmd->o.len |= F_INSN_SIZE(ipfw_insn_icmp6); } static void print_icmp6types(ipfw_insn_u32 *cmd) { int i, j; char sep= ' '; printf(" ip6 icmp6types"); for (i = 0; i < 7; i++) for (j=0; j < 32; ++j) { if ( (cmd->d[i] & (1 << (j))) == 0) continue; printf("%c%d", sep, (i*32 + j)); sep = ','; } } static void print_flow6id( ipfw_insn_u32 *cmd) { uint16_t i, limit = cmd->o.arg1; char sep = ','; printf(" flow-id "); for( i=0; i < limit; ++i) { if (i == limit - 1) sep = ' '; printf("%d%c", cmd->d[i], sep); } } /* structure and define for the extension header in ipv6 */ static struct _s_x ext6hdrcodes[] = { { "frag", EXT_FRAGMENT }, { "hopopt", EXT_HOPOPTS }, { "route", EXT_ROUTING }, { "dstopt", EXT_DSTOPTS }, { "ah", EXT_AH }, { "esp", EXT_ESP }, { NULL, 0 } }; /* fills command for the extension header filtering */ int fill_ext6hdr( ipfw_insn *cmd, char *av) { int tok; char *s = av; cmd->arg1 = 0; while(s) { av = strsep( &s, ",") ; tok = match_token(ext6hdrcodes, av); switch (tok) { case EXT_FRAGMENT: cmd->arg1 |= EXT_FRAGMENT; break; case EXT_HOPOPTS: cmd->arg1 |= EXT_HOPOPTS; break; case EXT_ROUTING: cmd->arg1 |= EXT_ROUTING; break; case EXT_DSTOPTS: cmd->arg1 |= EXT_DSTOPTS; break; case EXT_AH: cmd->arg1 |= EXT_AH; break; case EXT_ESP: cmd->arg1 |= EXT_ESP; break; default: errx( EX_DATAERR, "invalid option for ipv6 exten header" ); break; } } if (cmd->arg1 == 0 ) return 0; cmd->opcode = O_EXT_HDR; cmd->len |= F_INSN_SIZE( ipfw_insn ); return 1; } void print_ext6hdr( ipfw_insn *cmd ) { char sep = ' '; printf(" extension header:"); if (cmd->arg1 & EXT_FRAGMENT ) { printf("%cfragmentation", sep); sep = ','; } if (cmd->arg1 & EXT_HOPOPTS ) { printf("%chop options", sep); sep = ','; } if (cmd->arg1 & EXT_ROUTING ) { printf("%crouting options", sep); sep = ','; } if (cmd->arg1 & EXT_DSTOPTS ) { printf("%cdestination options", sep); sep = ','; } if (cmd->arg1 & EXT_AH ) { printf("%cauthentication header", sep); sep = ','; } if (cmd->arg1 & EXT_ESP ) { printf("%cencapsulated security payload", sep); } } /* * show_ipfw() prints the body of an ipfw rule. * Because the standard rule has at least proto src_ip dst_ip, we use * a helper function to produce these entries if not provided explicitly. * The first argument is the list of fields we have, the second is * the list of fields we want to be printed. * * Special cases if we have provided a MAC header: * + if the rule does not contain IP addresses/ports, do not print them; * + if the rule does not contain an IP proto, print "all" instead of "ip"; * * Once we have 'have_options', IP header fields are printed as options. */ #define HAVE_PROTO 0x0001 #define HAVE_SRCIP 0x0002 #define HAVE_DSTIP 0x0004 #define HAVE_MAC 0x0008 #define HAVE_MACTYPE 0x0010 #define HAVE_PROTO4 0x0040 #define HAVE_PROTO6 0x0080 #define HAVE_OPTIONS 0x8000 #define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) static void show_prerequisites(int *flags, int want, int cmd) { if (comment_only) return; if ( (*flags & HAVE_IP) == HAVE_IP) *flags |= HAVE_OPTIONS; if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && cmd != O_MAC_TYPE) { /* * mac-type was optimized out by the compiler, * restore it */ printf(" any"); *flags |= HAVE_MACTYPE | HAVE_OPTIONS; return; } if ( !(*flags & HAVE_OPTIONS)) { if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) if ( (*flags & HAVE_PROTO4)) printf(" ip4"); else if ( (*flags & HAVE_PROTO6)) printf(" ip6"); else printf(" ip"); if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) printf(" from any"); if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) printf(" to any"); } *flags |= want; } static void show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) { static int twidth = 0; int l; ipfw_insn *cmd, *tagptr = NULL; char *comment = NULL; /* ptr to comment if we have one */ int proto = 0; /* default */ int flags = 0; /* prerequisites */ ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */ int or_block = 0; /* we are in an or block */ uint32_t set_disable; bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); if (set_disable & (1 << rule->set)) { /* disabled */ if (!show_sets) return; else printf("# DISABLED "); } printf("%05u ", rule->rulenum); if (pcwidth>0 || bcwidth>0) printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), bcwidth, align_uint64(&rule->bcnt)); if (do_time == 2) printf("%10u ", rule->timestamp); else if (do_time == 1) { char timestr[30]; time_t t = (time_t)0; if (twidth == 0) { strcpy(timestr, ctime(&t)); *strchr(timestr, '\n') = '\0'; twidth = strlen(timestr); } if (rule->timestamp) { t = _long_to_time(rule->timestamp); strcpy(timestr, ctime(&t)); *strchr(timestr, '\n') = '\0'; printf("%s ", timestr); } else { printf("%*s", twidth, " "); } } if (show_sets) printf("set %d ", rule->set); /* * print the optional "match probability" */ if (rule->cmd_len > 0) { cmd = rule->cmd ; if (cmd->opcode == O_PROB) { ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; double d = 1.0 * p->d[0]; d = (d / 0x7fffffff); printf("prob %f ", d); } } /* * first print actions */ for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { switch(cmd->opcode) { case O_CHECK_STATE: printf("check-state"); flags = HAVE_IP; /* avoid printing anything else */ break; case O_ACCEPT: printf("allow"); break; case O_COUNT: printf("count"); break; case O_DENY: printf("deny"); break; case O_REJECT: if (cmd->arg1 == ICMP_REJECT_RST) printf("reset"); else if (cmd->arg1 == ICMP_UNREACH_HOST) printf("reject"); else print_reject_code(cmd->arg1); break; case O_UNREACH6: if (cmd->arg1 == ICMP6_UNREACH_RST) printf("reset6"); else print_unreach6_code(cmd->arg1); break; case O_SKIPTO: PRINT_UINT_ARG("skipto ", cmd->arg1); break; case O_PIPE: PRINT_UINT_ARG("pipe ", cmd->arg1); break; case O_QUEUE: PRINT_UINT_ARG("queue ", cmd->arg1); break; case O_DIVERT: PRINT_UINT_ARG("divert ", cmd->arg1); break; case O_TEE: PRINT_UINT_ARG("tee ", cmd->arg1); break; case O_NETGRAPH: PRINT_UINT_ARG("netgraph ", cmd->arg1); break; case O_NGTEE: PRINT_UINT_ARG("ngtee ", cmd->arg1); break; case O_FORWARD_IP: { ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; if (s->sa.sin_addr.s_addr == INADDR_ANY) { printf("fwd tablearg"); } else { printf("fwd %s", inet_ntoa(s->sa.sin_addr)); } if (s->sa.sin_port) printf(",%d", s->sa.sin_port); } break; case O_LOG: /* O_LOG is printed last */ logptr = (ipfw_insn_log *)cmd; break; case O_ALTQ: /* O_ALTQ is printed after O_LOG */ altqptr = (ipfw_insn_altq *)cmd; break; case O_TAG: tagptr = cmd; break; case O_NAT: printf("nat %u", cmd->arg1); break; default: printf("** unrecognized action %d len %d ", cmd->opcode, cmd->len); } } if (logptr) { if (logptr->max_log > 0) printf(" log logamount %d", logptr->max_log); else printf(" log"); } if (altqptr) { const char *qname; qname = altq_qid_to_name(altqptr->qid); if (qname == NULL) printf(" altq ?<%u>", altqptr->qid); else printf(" altq %s", qname); } if (tagptr) { if (tagptr->len & F_NOT) PRINT_UINT_ARG(" untag ", tagptr->arg1); else PRINT_UINT_ARG(" tag ", tagptr->arg1); } /* * then print the body. */ for (l = rule->act_ofs, cmd = rule->cmd ; l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { if ((cmd->len & F_OR) || (cmd->len & F_NOT)) continue; if (cmd->opcode == O_IP4) { flags |= HAVE_PROTO4; break; } else if (cmd->opcode == O_IP6) { flags |= HAVE_PROTO6; break; } } if (rule->_pad & 1) { /* empty rules before options */ if (!do_compact) { show_prerequisites(&flags, HAVE_PROTO, 0); printf(" from any to any"); } flags |= HAVE_IP | HAVE_OPTIONS; } if (comment_only) comment = "..."; for (l = rule->act_ofs, cmd = rule->cmd ; l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { /* useful alias */ ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; if (comment_only) { if (cmd->opcode != O_NOP) continue; printf(" // %s\n", (char *)(cmd + 1)); return; } show_prerequisites(&flags, 0, cmd->opcode); switch(cmd->opcode) { case O_PROB: break; /* done already */ case O_PROBE_STATE: break; /* no need to print anything here */ case O_MACADDR2: { ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; if ((cmd->len & F_OR) && !or_block) printf(" {"); if (cmd->len & F_NOT) printf(" not"); printf(" MAC"); flags |= HAVE_MAC; print_mac(m->addr, m->mask); print_mac(m->addr + 6, m->mask + 6); } break; case O_MAC_TYPE: if ((cmd->len & F_OR) && !or_block) printf(" {"); print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, (flags & HAVE_OPTIONS) ? cmd->opcode : 0); flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; break; case O_IP_SRC: case O_IP_SRC_LOOKUP: case O_IP_SRC_MASK: case O_IP_SRC_ME: case O_IP_SRC_SET: show_prerequisites(&flags, HAVE_PROTO, 0); if (!(flags & HAVE_SRCIP)) printf(" from"); if ((cmd->len & F_OR) && !or_block) printf(" {"); print_ip((ipfw_insn_ip *)cmd, (flags & HAVE_OPTIONS) ? " src-ip" : ""); flags |= HAVE_SRCIP; break; case O_IP_DST: case O_IP_DST_LOOKUP: case O_IP_DST_MASK: case O_IP_DST_ME: case O_IP_DST_SET: show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); if (!(flags & HAVE_DSTIP)) printf(" to"); if ((cmd->len & F_OR) && !or_block) printf(" {"); print_ip((ipfw_insn_ip *)cmd, (flags & HAVE_OPTIONS) ? " dst-ip" : ""); flags |= HAVE_DSTIP; break; case O_IP6_SRC: case O_IP6_SRC_MASK: case O_IP6_SRC_ME: show_prerequisites(&flags, HAVE_PROTO, 0); if (!(flags & HAVE_SRCIP)) printf(" from"); if ((cmd->len & F_OR) && !or_block) printf(" {"); print_ip6((ipfw_insn_ip6 *)cmd, (flags & HAVE_OPTIONS) ? " src-ip6" : ""); flags |= HAVE_SRCIP | HAVE_PROTO; break; case O_IP6_DST: case O_IP6_DST_MASK: case O_IP6_DST_ME: show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); if (!(flags & HAVE_DSTIP)) printf(" to"); if ((cmd->len & F_OR) && !or_block) printf(" {"); print_ip6((ipfw_insn_ip6 *)cmd, (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); flags |= HAVE_DSTIP; break; case O_FLOW6ID: print_flow6id( (ipfw_insn_u32 *) cmd ); flags |= HAVE_OPTIONS; break; case O_IP_DSTPORT: show_prerequisites(&flags, HAVE_IP, 0); case O_IP_SRCPORT: show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); if ((cmd->len & F_OR) && !or_block) printf(" {"); print_newports((ipfw_insn_u16 *)cmd, proto, (flags & HAVE_OPTIONS) ? cmd->opcode : 0); break; case O_PROTO: { struct protoent *pe = NULL; if ((cmd->len & F_OR) && !or_block) printf(" {"); if (cmd->len & F_NOT) printf(" not"); proto = cmd->arg1; pe = getprotobynumber(cmd->arg1); if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && !(flags & HAVE_PROTO)) show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); if (flags & HAVE_OPTIONS) printf(" proto"); if (pe) printf(" %s", pe->p_name); else printf(" %u", cmd->arg1); } flags |= HAVE_PROTO; break; default: /*options ... */ if (!(cmd->len & (F_OR|F_NOT))) if (((cmd->opcode == O_IP6) && (flags & HAVE_PROTO6)) || ((cmd->opcode == O_IP4) && (flags & HAVE_PROTO4))) break; show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); if ((cmd->len & F_OR) && !or_block) printf(" {"); if (cmd->len & F_NOT && cmd->opcode != O_IN) printf(" not"); switch(cmd->opcode) { case O_FRAG: printf(" frag"); break; case O_IN: printf(cmd->len & F_NOT ? " out" : " in"); break; case O_DIVERTED: switch (cmd->arg1) { case 3: printf(" diverted"); break; case 1: printf(" diverted-loopback"); break; case 2: printf(" diverted-output"); break; default: printf(" diverted-?<%u>", cmd->arg1); break; } break; case O_LAYER2: printf(" layer2"); break; case O_XMIT: case O_RECV: case O_VIA: { char const *s; ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; if (cmd->opcode == O_XMIT) s = "xmit"; else if (cmd->opcode == O_RECV) s = "recv"; else /* if (cmd->opcode == O_VIA) */ s = "via"; if (cmdif->name[0] == '\0') printf(" %s %s", s, inet_ntoa(cmdif->p.ip)); else printf(" %s %s", s, cmdif->name); break; } case O_IPID: if (F_LEN(cmd) == 1) printf(" ipid %u", cmd->arg1 ); else print_newports((ipfw_insn_u16 *)cmd, 0, O_IPID); break; case O_IPTTL: if (F_LEN(cmd) == 1) printf(" ipttl %u", cmd->arg1 ); else print_newports((ipfw_insn_u16 *)cmd, 0, O_IPTTL); break; case O_IPVER: printf(" ipver %u", cmd->arg1 ); break; case O_IPPRECEDENCE: printf(" ipprecedence %u", (cmd->arg1) >> 5 ); break; case O_IPLEN: if (F_LEN(cmd) == 1) printf(" iplen %u", cmd->arg1 ); else print_newports((ipfw_insn_u16 *)cmd, 0, O_IPLEN); break; case O_IPOPT: print_flags("ipoptions", cmd, f_ipopts); break; case O_IPTOS: print_flags("iptos", cmd, f_iptos); break; case O_ICMPTYPE: print_icmptypes((ipfw_insn_u32 *)cmd); break; case O_ESTAB: printf(" established"); break; case O_TCPDATALEN: if (F_LEN(cmd) == 1) printf(" tcpdatalen %u", cmd->arg1 ); else print_newports((ipfw_insn_u16 *)cmd, 0, O_TCPDATALEN); break; case O_TCPFLAGS: print_flags("tcpflags", cmd, f_tcpflags); break; case O_TCPOPTS: print_flags("tcpoptions", cmd, f_tcpopts); break; case O_TCPWIN: printf(" tcpwin %d", ntohs(cmd->arg1)); break; case O_TCPACK: printf(" tcpack %d", ntohl(cmd32->d[0])); break; case O_TCPSEQ: printf(" tcpseq %d", ntohl(cmd32->d[0])); break; case O_UID: { struct passwd *pwd = getpwuid(cmd32->d[0]); if (pwd) printf(" uid %s", pwd->pw_name); else printf(" uid %u", cmd32->d[0]); } break; case O_GID: { struct group *grp = getgrgid(cmd32->d[0]); if (grp) printf(" gid %s", grp->gr_name); else printf(" gid %u", cmd32->d[0]); } break; case O_JAIL: printf(" jail %d", cmd32->d[0]); break; case O_VERREVPATH: printf(" verrevpath"); break; case O_VERSRCREACH: printf(" versrcreach"); break; case O_ANTISPOOF: printf(" antispoof"); break; case O_IPSEC: printf(" ipsec"); break; case O_NOP: comment = (char *)(cmd + 1); break; case O_KEEP_STATE: printf(" keep-state"); break; case O_LIMIT: { struct _s_x *p = limit_masks; ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; uint8_t x = c->limit_mask; char const *comma = " "; printf(" limit"); for (; p->x != 0 ; p++) if ((x & p->x) == p->x) { x &= ~p->x; printf("%s%s", comma, p->s); comma = ","; } PRINT_UINT_ARG(" ", c->conn_limit); break; } case O_IP6: printf(" ip6"); break; case O_IP4: printf(" ip4"); break; case O_ICMP6TYPE: print_icmp6types((ipfw_insn_u32 *)cmd); break; case O_EXT_HDR: print_ext6hdr( (ipfw_insn *) cmd ); break; case O_TAGGED: if (F_LEN(cmd) == 1) PRINT_UINT_ARG(" tagged ", cmd->arg1); else print_newports((ipfw_insn_u16 *)cmd, 0, O_TAGGED); break; default: printf(" [opcode %d len %d]", cmd->opcode, cmd->len); } } if (cmd->len & F_OR) { printf(" or"); or_block = 1; } else if (or_block) { printf(" }"); or_block = 0; } } show_prerequisites(&flags, HAVE_IP, 0); if (comment) printf(" // %s", comment); printf("\n"); } static void show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) { struct protoent *pe; struct in_addr a; uint16_t rulenum; char buf[INET6_ADDRSTRLEN]; if (!do_expired) { if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) return; } bcopy(&d->rule, &rulenum, sizeof(rulenum)); printf("%05d", rulenum); if (pcwidth>0 || bcwidth>0) printf(" %*llu %*llu (%ds)", pcwidth, align_uint64(&d->pcnt), bcwidth, align_uint64(&d->bcnt), d->expire); switch (d->dyn_type) { case O_LIMIT_PARENT: printf(" PARENT %d", d->count); break; case O_LIMIT: printf(" LIMIT"); break; case O_KEEP_STATE: /* bidir, no mask */ printf(" STATE"); break; } if ((pe = getprotobynumber(d->id.proto)) != NULL) printf(" %s", pe->p_name); else printf(" proto %u", d->id.proto); if (d->id.addr_type == 4) { a.s_addr = htonl(d->id.src_ip); printf(" %s %d", inet_ntoa(a), d->id.src_port); a.s_addr = htonl(d->id.dst_ip); printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); } else if (d->id.addr_type == 6) { printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, sizeof(buf)), d->id.src_port); printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, sizeof(buf)), d->id.dst_port); } else printf(" UNKNOWN <-> UNKNOWN\n"); printf("\n"); } static int sort_q(const void *pa, const void *pb) { int rev = (do_sort < 0); int field = rev ? -do_sort : do_sort; long long res = 0; const struct dn_flow_queue *a = pa; const struct dn_flow_queue *b = pb; switch (field) { case 1: /* pkts */ res = a->len - b->len; break; case 2: /* bytes */ res = a->len_bytes - b->len_bytes; break; case 3: /* tot pkts */ res = a->tot_pkts - b->tot_pkts; break; case 4: /* tot bytes */ res = a->tot_bytes - b->tot_bytes; break; } if (res < 0) res = -1; if (res > 0) res = 1; return (int)(rev ? res : -res); } static void list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) { int l; int index_printed, indexes = 0; char buff[255]; struct protoent *pe; if (fs->rq_elements == 0) return; if (do_sort != 0) heapsort(q, fs->rq_elements, sizeof *q, sort_q); /* Print IPv4 flows */ index_printed = 0; for (l = 0; l < fs->rq_elements; l++) { struct in_addr ina; /* XXX: Should check for IPv4 flows */ if (IS_IP6_FLOW_ID(&(q[l].id))) continue; if (!index_printed) { index_printed = 1; if (indexes > 0) /* currently a no-op */ printf("\n"); indexes++; printf(" " "mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", fs->flow_mask.proto, fs->flow_mask.src_ip, fs->flow_mask.src_port, fs->flow_mask.dst_ip, fs->flow_mask.dst_port); printf("BKT Prot ___Source IP/port____ " "____Dest. IP/port____ " "Tot_pkt/bytes Pkt/Byte Drp\n"); } printf("%3d ", q[l].hash_slot); pe = getprotobynumber(q[l].id.proto); if (pe) printf("%-4s ", pe->p_name); else printf("%4u ", q[l].id.proto); ina.s_addr = htonl(q[l].id.src_ip); printf("%15s/%-5d ", inet_ntoa(ina), q[l].id.src_port); ina.s_addr = htonl(q[l].id.dst_ip); printf("%15s/%-5d ", inet_ntoa(ina), q[l].id.dst_port); printf("%4qu %8qu %2u %4u %3u\n", q[l].tot_pkts, q[l].tot_bytes, q[l].len, q[l].len_bytes, q[l].drops); if (verbose) printf(" S %20qd F %20qd\n", q[l].S, q[l].F); } /* Print IPv6 flows */ index_printed = 0; for (l = 0; l < fs->rq_elements; l++) { if (!IS_IP6_FLOW_ID(&(q[l].id))) continue; if (!index_printed) { index_printed = 1; if (indexes > 0) printf("\n"); indexes++; printf("\n mask: proto: 0x%02x, flow_id: 0x%08x, ", fs->flow_mask.proto, fs->flow_mask.flow_id6); inet_ntop(AF_INET6, &(fs->flow_mask.src_ip6), buff, sizeof(buff)); printf("%s/0x%04x -> ", buff, fs->flow_mask.src_port); inet_ntop( AF_INET6, &(fs->flow_mask.dst_ip6), buff, sizeof(buff) ); printf("%s/0x%04x\n", buff, fs->flow_mask.dst_port); printf("BKT ___Prot___ _flow-id_ " "______________Source IPv6/port_______________ " "_______________Dest. IPv6/port_______________ " "Tot_pkt/bytes Pkt/Byte Drp\n"); } printf("%3d ", q[l].hash_slot); pe = getprotobynumber(q[l].id.proto); if (pe != NULL) printf("%9s ", pe->p_name); else printf("%9u ", q[l].id.proto); printf("%7d %39s/%-5d ", q[l].id.flow_id6, inet_ntop(AF_INET6, &(q[l].id.src_ip6), buff, sizeof(buff)), q[l].id.src_port); printf(" %39s/%-5d ", inet_ntop(AF_INET6, &(q[l].id.dst_ip6), buff, sizeof(buff)), q[l].id.dst_port); printf(" %4qu %8qu %2u %4u %3u\n", q[l].tot_pkts, q[l].tot_bytes, q[l].len, q[l].len_bytes, q[l].drops); if (verbose) printf(" S %20qd F %20qd\n", q[l].S, q[l].F); } } static void print_flowset_parms(struct dn_flow_set *fs, char *prefix) { int l; char qs[30]; char plr[30]; char red[90]; /* Display RED parameters */ l = fs->qsize; if (fs->flags_fs & DN_QSIZE_IS_BYTES) { if (l >= 8192) sprintf(qs, "%d KB", l / 1024); else sprintf(qs, "%d B", l); } else sprintf(qs, "%3d sl.", l); if (fs->plr) sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); else plr[0] = '\0'; if (fs->flags_fs & DN_IS_RED) /* RED parameters */ sprintf(red, "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1.0 * fs->w_q / (double)(1 << SCALE_RED), SCALE_VAL(fs->min_th), SCALE_VAL(fs->max_th), 1.0 * fs->max_p / (double)(1 << SCALE_RED)); else sprintf(red, "droptail"); printf("%s %s%s %d queues (%d buckets) %s\n", prefix, qs, plr, fs->rq_elements, fs->rq_size, red); } static void list_pipes(void *data, uint nbytes, int ac, char *av[]) { int rulenum; void *next = data; struct dn_pipe *p = (struct dn_pipe *) data; struct dn_flow_set *fs; struct dn_flow_queue *q; int l; if (ac > 0) rulenum = strtoul(*av++, NULL, 10); else rulenum = 0; for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { double b = p->bandwidth; char buf[30]; char prefix[80]; if (SLIST_NEXT(p, next) != (struct dn_pipe *)DN_IS_PIPE) break; /* done with pipes, now queues */ /* * compute length, as pipe have variable size */ l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); next = (char *)p + l; nbytes -= l; if ((rulenum != 0 && rulenum != p->pipe_nr) || do_pipe == 2) continue; /* * Print rate (or clocking interface) */ if (p->if_name[0] != '\0') sprintf(buf, "%s", p->if_name); else if (b == 0) sprintf(buf, "unlimited"); else if (b >= 1000000) sprintf(buf, "%7.3f Mbit/s", b/1000000); else if (b >= 1000) sprintf(buf, "%7.3f Kbit/s", b/1000); else sprintf(buf, "%7.3f bit/s ", b); sprintf(prefix, "%05d: %s %4d ms ", p->pipe_nr, buf, p->delay); print_flowset_parms(&(p->fs), prefix); if (verbose) printf(" V %20qd\n", p->V >> MY_M); q = (struct dn_flow_queue *)(p+1); list_queues(&(p->fs), q); } for (fs = next; nbytes >= sizeof *fs; fs = next) { char prefix[80]; if (SLIST_NEXT(fs, next) != (struct dn_flow_set *)DN_IS_QUEUE) break; l = sizeof(*fs) + fs->rq_elements * sizeof(*q); next = (char *)fs + l; nbytes -= l; if (rulenum != 0 && ((rulenum != fs->fs_nr && do_pipe == 2) || (rulenum != fs->parent_nr && do_pipe == 1))) { continue; } q = (struct dn_flow_queue *)(fs+1); sprintf(prefix, "q%05d: weight %d pipe %d ", fs->fs_nr, fs->weight, fs->parent_nr); print_flowset_parms(fs, prefix); list_queues(fs, q); } } /* * This one handles all set-related commands * ipfw set { show | enable | disable } * ipfw set swap X Y * ipfw set move X to Y * ipfw set move rule X to Y */ static void sets_handler(int ac, char *av[]) { uint32_t set_disable, masks[2]; int i, nbytes; uint16_t rulenum; uint8_t cmd, new_set; ac--; av++; if (!ac) errx(EX_USAGE, "set needs command"); if (_substrcmp(*av, "show") == 0) { void *data; char const *msg; nbytes = sizeof(struct ip_fw); if ((data = calloc(1, nbytes)) == NULL) err(EX_OSERR, "calloc"); if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) err(EX_OSERR, "getsockopt(IP_FW_GET)"); bcopy(&((struct ip_fw *)data)->next_rule, &set_disable, sizeof(set_disable)); for (i = 0, msg = "disable" ; i < RESVD_SET; i++) if ((set_disable & (1< RESVD_SET) errx(EX_DATAERR, "invalid set number %s\n", av[0]); if (!isdigit(*(av[1])) || new_set > RESVD_SET) errx(EX_DATAERR, "invalid set number %s\n", av[1]); masks[0] = (4 << 24) | (new_set << 16) | (rulenum); i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); } else if (_substrcmp(*av, "move") == 0) { ac--; av++; if (ac && _substrcmp(*av, "rule") == 0) { cmd = 2; ac--; av++; } else cmd = 3; if (ac != 3 || _substrcmp(av[1], "to") != 0) errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); rulenum = atoi(av[0]); new_set = atoi(av[2]); if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || (cmd == 2 && rulenum == 65535) ) errx(EX_DATAERR, "invalid source number %s\n", av[0]); if (!isdigit(*(av[2])) || new_set > RESVD_SET) errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); } else if (_substrcmp(*av, "disable") == 0 || _substrcmp(*av, "enable") == 0 ) { int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; ac--; av++; masks[0] = masks[1] = 0; while (ac) { if (isdigit(**av)) { i = atoi(*av); if (i < 0 || i > RESVD_SET) errx(EX_DATAERR, "invalid set number %d\n", i); masks[which] |= (1<= nalloc) { nalloc = nalloc * 2 + 200; nbytes = nalloc; if ((data = realloc(data, nbytes)) == NULL) err(EX_OSERR, "realloc"); if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) err(EX_OSERR, "getsockopt(IP_%s_GET)", do_pipe ? "DUMMYNET" : "FW"); } if (do_pipe) { list_pipes(data, nbytes, ac, av); goto done; } /* * Count static rules. They have variable size so we * need to scan the list to count them. */ for (nstat = 1, r = data, lim = (char *)data + nbytes; r->rulenum < 65535 && (char *)r < lim; ++nstat, r = NEXT(r) ) ; /* nothing */ /* * Count dynamic rules. This is easier as they have * fixed size. */ r = NEXT(r); dynrules = (ipfw_dyn_rule *)r ; n = (char *)r - (char *)data; ndyn = (nbytes - n) / sizeof *dynrules; /* if showing stats, figure out column widths ahead of time */ bcwidth = pcwidth = 0; if (show_counters) { for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { /* packet counter */ width = snprintf(NULL, 0, "%llu", align_uint64(&r->pcnt)); if (width > pcwidth) pcwidth = width; /* byte counter */ width = snprintf(NULL, 0, "%llu", align_uint64(&r->bcnt)); if (width > bcwidth) bcwidth = width; } } if (do_dynamic && ndyn) { for (n = 0, d = dynrules; n < ndyn; n++, d++) { width = snprintf(NULL, 0, "%llu", align_uint64(&d->pcnt)); if (width > pcwidth) pcwidth = width; width = snprintf(NULL, 0, "%llu", align_uint64(&d->bcnt)); if (width > bcwidth) bcwidth = width; } } /* if no rule numbers were specified, list all rules */ if (ac == 0) { for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) show_ipfw(r, pcwidth, bcwidth); if (do_dynamic && ndyn) { printf("## Dynamic rules (%d):\n", ndyn); for (n = 0, d = dynrules; n < ndyn; n++, d++) show_dyn_ipfw(d, pcwidth, bcwidth); } goto done; } /* display specific rules requested on command line */ for (lac = ac, lav = av; lac != 0; lac--) { /* convert command line rule # */ last = rnum = strtoul(*lav++, &endptr, 10); if (*endptr == '-') last = strtoul(endptr+1, &endptr, 10); if (*endptr) { exitval = EX_USAGE; warnx("invalid rule number: %s", *(lav - 1)); continue; } for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { if (r->rulenum > last) break; if (r->rulenum >= rnum && r->rulenum <= last) { show_ipfw(r, pcwidth, bcwidth); seen = 1; } } if (!seen) { /* give precedence to other error(s) */ if (exitval == EX_OK) exitval = EX_UNAVAILABLE; warnx("rule %lu does not exist", rnum); } } if (do_dynamic && ndyn) { printf("## Dynamic rules:\n"); for (lac = ac, lav = av; lac != 0; lac--) { last = rnum = strtoul(*lav++, &endptr, 10); if (*endptr == '-') last = strtoul(endptr+1, &endptr, 10); if (*endptr) /* already warned */ continue; for (n = 0, d = dynrules; n < ndyn; n++, d++) { uint16_t rulenum; bcopy(&d->rule, &rulenum, sizeof(rulenum)); if (rulenum > rnum) break; if (r->rulenum >= rnum && r->rulenum <= last) show_dyn_ipfw(d, pcwidth, bcwidth); } } } ac = 0; done: free(data); if (exitval != EX_OK) exit(exitval); #undef NEXT } static void show_usage(void) { fprintf(stderr, "usage: ipfw [options]\n" "do \"ipfw -h\" or see ipfw manpage for details\n" ); exit(EX_USAGE); } static void help(void) { fprintf(stderr, "ipfw syntax summary (but please do read the ipfw(8) manpage):\n" "ipfw [-abcdefhnNqStTv] where is one of:\n" "add [num] [set N] [prob x] RULE-BODY\n" "{pipe|queue} N config PIPE-BODY\n" "[pipe|queue] {zero|delete|show} [N{,N}]\n" "nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|reset|\n" " reverse|proxy_only|redirect_addr linkspec|\n" " redirect_port linkspec|redirect_proto linkspec}\n" "set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" "table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n" "\n" "RULE-BODY: check-state [PARAMS] | ACTION [PARAMS] ADDR [OPTION_LIST]\n" "ACTION: check-state | allow | count | deny | unreach{,6} CODE |\n" " skipto N | {divert|tee} PORT | forward ADDR |\n" " pipe N | queue N | nat N\n" "PARAMS: [log [logamount LOGLIMIT]] [altq QUEUE_NAME]\n" "ADDR: [ MAC dst src ether_type ] \n" " [ ip from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" " [ ipv6|ip6 from IP6ADDR [ PORT ] to IP6ADDR [ PORTLIST ] ]\n" "IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n" "IP6ADDR: [not] { any | me | me6 | ip6/bits | IP6LIST }\n" "IP6LIST: { ip6 | ip6/bits }[,IP6LIST]\n" "IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" "OPTION_LIST: OPTION [OPTION_LIST]\n" "OPTION: bridged | diverted | diverted-loopback | diverted-output |\n" " {dst-ip|src-ip} IPADDR | {dst-ip6|src-ip6|dst-ipv6|src-ipv6} IP6ADDR |\n" " {dst-port|src-port} LIST |\n" " estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" " iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" " ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" " icmp6types LIST | ext6hdr LIST | flow-id N[,N] |\n" " mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" " setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" " tcpdatalen LIST | verrevpath | versrcreach | antispoof\n" ); exit(0); } static int lookup_host (char *host, struct in_addr *ipaddr) { struct hostent *he; if (!inet_aton(host, ipaddr)) { if ((he = gethostbyname(host)) == NULL) return(-1); *ipaddr = *(struct in_addr *)he->h_addr_list[0]; } return(0); } /* * fills the addr and mask fields in the instruction as appropriate from av. * Update length as appropriate. * The following formats are allowed: * me returns O_IP_*_ME * 1.2.3.4 single IP address * 1.2.3.4:5.6.7.8 address:mask * 1.2.3.4/24 address/mask * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet * We can have multiple comma-separated address/mask entries. */ static void fill_ip(ipfw_insn_ip *cmd, char *av) { int len = 0; uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; cmd->o.len &= ~F_LEN_MASK; /* zero len */ if (_substrcmp(av, "any") == 0) return; if (_substrcmp(av, "me") == 0) { cmd->o.len |= F_INSN_SIZE(ipfw_insn); return; } if (strncmp(av, "table(", 6) == 0) { char *p = strchr(av + 6, ','); if (p) *p++ = '\0'; cmd->o.opcode = O_IP_DST_LOOKUP; cmd->o.arg1 = strtoul(av + 6, NULL, 0); if (p) { cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); d[0] = strtoul(p, NULL, 0); } else cmd->o.len |= F_INSN_SIZE(ipfw_insn); return; } while (av) { /* * After the address we can have '/' or ':' indicating a mask, * ',' indicating another address follows, '{' indicating a * set of addresses of unspecified size. */ char *t = NULL, *p = strpbrk(av, "/:,{"); int masklen; char md, nd; if (p) { md = *p; *p++ = '\0'; if ((t = strpbrk(p, ",{")) != NULL) { nd = *t; *t = '\0'; } } else md = '\0'; if (lookup_host(av, (struct in_addr *)&d[0]) != 0) errx(EX_NOHOST, "hostname ``%s'' unknown", av); switch (md) { case ':': if (!inet_aton(p, (struct in_addr *)&d[1])) errx(EX_DATAERR, "bad netmask ``%s''", p); break; case '/': masklen = atoi(p); if (masklen == 0) d[1] = htonl(0); /* mask */ else if (masklen > 32) errx(EX_DATAERR, "bad width ``%s''", p); else d[1] = htonl(~0 << (32 - masklen)); break; case '{': /* no mask, assume /24 and put back the '{' */ d[1] = htonl(~0 << (32 - 24)); *(--p) = md; break; case ',': /* single address plus continuation */ *(--p) = md; /* FALLTHROUGH */ case 0: /* initialization value */ default: d[1] = htonl(~0); /* force /32 */ break; } d[0] &= d[1]; /* mask base address with mask */ if (t) *t = nd; /* find next separator */ if (p) p = strpbrk(p, ",{"); if (p && *p == '{') { /* * We have a set of addresses. They are stored as follows: * arg1 is the set size (powers of 2, 2..256) * addr is the base address IN HOST FORMAT * mask.. is an array of arg1 bits (rounded up to * the next multiple of 32) with bits set * for each host in the map. */ uint32_t *map = (uint32_t *)&cmd->mask; int low, high; int i = contigmask((uint8_t *)&(d[1]), 32); if (len > 0) errx(EX_DATAERR, "address set cannot be in a list"); if (i < 24 || i > 31) errx(EX_DATAERR, "invalid set with mask %d\n", i); cmd->o.arg1 = 1<<(32-i); /* map length */ d[0] = ntohl(d[0]); /* base addr in host format */ cmd->o.opcode = O_IP_DST_SET; /* default */ cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) map[i] = 0; /* clear map */ av = p + 1; low = d[0] & 0xff; high = low + cmd->o.arg1 - 1; /* * Here, i stores the previous value when we specify a range * of addresses within a mask, e.g. 45-63. i = -1 means we * have no previous value. */ i = -1; /* previous value in a range */ while (isdigit(*av)) { char *s; int a = strtol(av, &s, 0); if (s == av) { /* no parameter */ if (*av != '}') errx(EX_DATAERR, "set not closed\n"); if (i != -1) errx(EX_DATAERR, "incomplete range %d-", i); break; } if (a < low || a > high) errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", a, low, high); a -= low; if (i == -1) /* no previous in range */ i = a; else { /* check that range is valid */ if (i > a) errx(EX_DATAERR, "invalid range %d-%d", i+low, a+low); if (*s == '-') errx(EX_DATAERR, "double '-' in range"); } for (; i <= a; i++) map[i/32] |= 1<<(i & 31); i = -1; if (*s == '-') i = a; else if (*s == '}') break; av = s+1; } return; } av = p; if (av) /* then *av must be a ',' */ av++; /* Check this entry */ if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ /* * 'any' turns the entire list into a NOP. * 'not any' never matches, so it is removed from the * list unless it is the only item, in which case we * report an error. */ if (cmd->o.len & F_NOT) { /* "not any" never matches */ if (av == NULL && len == 0) /* only this entry */ errx(EX_DATAERR, "not any never matches"); } /* else do nothing and skip this entry */ return; } /* A single IP can be stored in an optimized format */ if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); return; } len += 2; /* two words... */ d += 2; } /* end while */ if (len + 1 > F_LEN_MASK) errx(EX_DATAERR, "address list too long"); cmd->o.len |= len+1; } /* Try to find ipv6 address by hostname */ static int lookup_host6 (char *host, struct in6_addr *ip6addr) { struct hostent *he; if (!inet_pton(AF_INET6, host, ip6addr)) { if ((he = gethostbyname2(host, AF_INET6)) == NULL) return(-1); memcpy(ip6addr, he->h_addr_list[0], sizeof( struct in6_addr)); } return(0); } /* n2mask sets n bits of the mask */ static void n2mask(struct in6_addr *mask, int n) { static int minimask[9] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; u_char *p; memset(mask, 0, sizeof(struct in6_addr)); p = (u_char *) mask; for (; n > 0; p++, n -= 8) { if (n >= 8) *p = 0xff; else *p = minimask[n]; } return; } /* * fill the addr and mask fields in the instruction as appropriate from av. * Update length as appropriate. * The following formats are allowed: * any matches any IP6. Actually returns an empty instruction. * me returns O_IP6_*_ME * * 03f1::234:123:0342 single IP6 addres * 03f1::234:123:0342/24 address/mask * 03f1::234:123:0342/24,03f1::234:123:0343/ List of address * * Set of address (as in ipv6) not supported because ipv6 address * are typically random past the initial prefix. * Return 1 on success, 0 on failure. */ static int fill_ip6(ipfw_insn_ip6 *cmd, char *av) { int len = 0; struct in6_addr *d = &(cmd->addr6); /* * Needed for multiple address. * Note d[1] points to struct in6_add r mask6 of cmd */ cmd->o.len &= ~F_LEN_MASK; /* zero len */ if (strcmp(av, "any") == 0) return (1); if (strcmp(av, "me") == 0) { /* Set the data for "me" opt*/ cmd->o.len |= F_INSN_SIZE(ipfw_insn); return (1); } if (strcmp(av, "me6") == 0) { /* Set the data for "me" opt*/ cmd->o.len |= F_INSN_SIZE(ipfw_insn); return (1); } av = strdup(av); while (av) { /* * After the address we can have '/' indicating a mask, * or ',' indicating another address follows. */ char *p; int masklen; char md = '\0'; if ((p = strpbrk(av, "/,")) ) { md = *p; /* save the separator */ *p = '\0'; /* terminate address string */ p++; /* and skip past it */ } /* now p points to NULL, mask or next entry */ /* lookup stores address in *d as a side effect */ if (lookup_host6(av, d) != 0) { /* XXX: failed. Free memory and go */ errx(EX_DATAERR, "bad address \"%s\"", av); } /* next, look at the mask, if any */ masklen = (md == '/') ? atoi(p) : 128; if (masklen > 128 || masklen < 0) errx(EX_DATAERR, "bad width \"%s\''", p); else n2mask(&d[1], masklen); APPLY_MASK(d, &d[1]) /* mask base address with mask */ /* find next separator */ if (md == '/') { /* find separator past the mask */ p = strpbrk(p, ","); if (p != NULL) p++; } av = p; /* Check this entry */ if (masklen == 0) { /* * 'any' turns the entire list into a NOP. * 'not any' never matches, so it is removed from the * list unless it is the only item, in which case we * report an error. */ if (cmd->o.len & F_NOT && av == NULL && len == 0) errx(EX_DATAERR, "not any never matches"); continue; } /* * A single IP can be stored alone */ if (masklen == 128 && av == NULL && len == 0) { len = F_INSN_SIZE(struct in6_addr); break; } /* Update length and pointer to arguments */ len += F_INSN_SIZE(struct in6_addr)*2; d += 2; } /* end while */ /* * Total length of the command, remember that 1 is the size of * the base command. */ if (len + 1 > F_LEN_MASK) errx(EX_DATAERR, "address list too long"); cmd->o.len |= len+1; free(av); return (1); } /* * fills command for ipv6 flow-id filtering * note that the 20 bit flow number is stored in a array of u_int32_t * it's supported lists of flow-id, so in the o.arg1 we store how many * additional flow-id we want to filter, the basic is 1 */ void fill_flow6( ipfw_insn_u32 *cmd, char *av ) { u_int32_t type; /* Current flow number */ u_int16_t nflow = 0; /* Current flow index */ char *s = av; cmd->d[0] = 0; /* Initializing the base number*/ while (s) { av = strsep( &s, ",") ; type = strtoul(av, &av, 0); if (*av != ',' && *av != '\0') errx(EX_DATAERR, "invalid ipv6 flow number %s", av); if (type > 0xfffff) errx(EX_DATAERR, "flow number out of range %s", av); cmd->d[nflow] |= type; nflow++; } if( nflow > 0 ) { cmd->o.opcode = O_FLOW6ID; cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + nflow; cmd->o.arg1 = nflow; } else { errx(EX_DATAERR, "invalid ipv6 flow number %s", av); } } static ipfw_insn * add_srcip6(ipfw_insn *cmd, char *av) { fill_ip6((ipfw_insn_ip6 *)cmd, av); if (F_LEN(cmd) == 0) /* any */ ; if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */ cmd->opcode = O_IP6_SRC_ME; } else if (F_LEN(cmd) == (F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) { /* single IP, no mask*/ cmd->opcode = O_IP6_SRC; } else { /* addr/mask opt */ cmd->opcode = O_IP6_SRC_MASK; } return cmd; } static ipfw_insn * add_dstip6(ipfw_insn *cmd, char *av) { fill_ip6((ipfw_insn_ip6 *)cmd, av); if (F_LEN(cmd) == 0) /* any */ ; if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */ cmd->opcode = O_IP6_DST_ME; } else if (F_LEN(cmd) == (F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) { /* single IP, no mask*/ cmd->opcode = O_IP6_DST; } else { /* addr/mask opt */ cmd->opcode = O_IP6_DST_MASK; } return cmd; } /* * helper function to process a set of flags and set bits in the * appropriate masks. */ static void fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, struct _s_x *flags, char *p) { uint8_t set=0, clear=0; while (p && *p) { char *q; /* points to the separator */ int val; uint8_t *which; /* mask we are working on */ if (*p == '!') { p++; which = &clear; } else which = &set; q = strchr(p, ','); if (q) *q++ = '\0'; val = match_token(flags, p); if (val <= 0) errx(EX_DATAERR, "invalid flag %s", p); *which |= (uint8_t)val; p = q; } cmd->opcode = opcode; cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); } static void delete(int ac, char *av[]) { uint32_t rulenum; struct dn_pipe p; int i; int exitval = EX_OK; int do_set = 0; memset(&p, 0, sizeof p); av++; ac--; NEED1("missing rule specification"); if (ac > 0 && _substrcmp(*av, "set") == 0) { do_set = 1; /* delete set */ ac--; av++; } /* Rule number */ while (ac && isdigit(**av)) { i = atoi(*av); av++; ac--; if (do_nat) { exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i); if (exitval) { exitval = EX_UNAVAILABLE; warn("rule %u not available", i); } } else if (do_pipe) { if (do_pipe == 1) p.pipe_nr = i; else p.fs.fs_nr = i; i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); if (i) { exitval = 1; warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); } } else { rulenum = (i & 0xffff) | (do_set << 24); i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); if (i) { exitval = EX_UNAVAILABLE; warn("rule %u: setsockopt(IP_FW_DEL)", rulenum); } } } if (exitval != EX_OK) exit(exitval); } /* * fill the interface structure. We do not check the name as we can * create interfaces dynamically, so checking them at insert time * makes relatively little sense. * Interface names containing '*', '?', or '[' are assumed to be shell * patterns which match interfaces. */ static void fill_iface(ipfw_insn_if *cmd, char *arg) { cmd->name[0] = '\0'; cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); /* Parse the interface or address */ if (strcmp(arg, "any") == 0) cmd->o.len = 0; /* effectively ignore this command */ else if (!isdigit(*arg)) { strlcpy(cmd->name, arg, sizeof(cmd->name)); cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0; } else if (!inet_aton(arg, &cmd->p.ip)) errx(EX_DATAERR, "bad ip address ``%s''", arg); } /* * Search for interface with name "ifn", and fill n accordingly: * * n->ip ip address of interface "ifn" * n->if_name copy of interface name "ifn" */ static void set_addr_dynamic(const char *ifn, struct cfg_nat *n) { size_t needed; int mib[6]; char *buf, *lim, *next; struct if_msghdr *ifm; struct ifa_msghdr *ifam; struct sockaddr_dl *sdl; struct sockaddr_in *sin; int ifIndex, ifMTU; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = AF_INET; mib[4] = NET_RT_IFLIST; mib[5] = 0; /* * Get interface data. */ if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) err(1, "iflist-sysctl-estimate"); if ((buf = malloc(needed)) == NULL) errx(1, "malloc failed"); if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) err(1, "iflist-sysctl-get"); lim = buf + needed; /* * Loop through interfaces until one with * given name is found. This is done to * find correct interface index for routing * message processing. */ ifIndex = 0; next = buf; while (next < lim) { ifm = (struct if_msghdr *)next; next += ifm->ifm_msglen; if (ifm->ifm_version != RTM_VERSION) { if (verbose) warnx("routing message version %d " "not understood", ifm->ifm_version); continue; } if (ifm->ifm_type == RTM_IFINFO) { sdl = (struct sockaddr_dl *)(ifm + 1); if (strlen(ifn) == sdl->sdl_nlen && strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) { ifIndex = ifm->ifm_index; ifMTU = ifm->ifm_data.ifi_mtu; break; } } } if (!ifIndex) errx(1, "unknown interface name %s", ifn); /* * Get interface address. */ sin = NULL; while (next < lim) { ifam = (struct ifa_msghdr *)next; next += ifam->ifam_msglen; if (ifam->ifam_version != RTM_VERSION) { if (verbose) warnx("routing message version %d " "not understood", ifam->ifam_version); continue; } if (ifam->ifam_type != RTM_NEWADDR) break; if (ifam->ifam_addrs & RTA_IFA) { int i; char *cp = (char *)(ifam + 1); for (i = 1; i < RTA_IFA; i <<= 1) { if (ifam->ifam_addrs & i) cp += SA_SIZE((struct sockaddr *)cp); } if (((struct sockaddr *)cp)->sa_family == AF_INET) { sin = (struct sockaddr_in *)cp; break; } } } if (sin == NULL) errx(1, "%s: cannot get interface address", ifn); n->ip = sin->sin_addr; strncpy(n->if_name, ifn, IF_NAMESIZE); free(buf); } /* * XXX - The following functions, macros and definitions come from natd.c: * it would be better to move them outside natd.c, in a file * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live * with it. */ /* * Definition of a port range, and macros to deal with values. * FORMAT: HI 16-bits == first port in range, 0 == all ports. * LO 16-bits == number of ports in range * NOTES: - Port values are not stored in network byte order. */ #define port_range u_long #define GETLOPORT(x) ((x) >> 0x10) #define GETNUMPORTS(x) ((x) & 0x0000ffff) #define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x))) /* Set y to be the low-port value in port_range variable x. */ #define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10)) /* Set y to be the number of ports in port_range variable x. */ #define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y)) static void StrToAddr (const char* str, struct in_addr* addr) { struct hostent* hp; if (inet_aton (str, addr)) return; hp = gethostbyname (str); if (!hp) errx (1, "unknown host %s", str); memcpy (addr, hp->h_addr, sizeof (struct in_addr)); } static int StrToPortRange (const char* str, const char* proto, port_range *portRange) { char* sep; struct servent* sp; char* end; u_short loPort; u_short hiPort; /* First see if this is a service, return corresponding port if so. */ sp = getservbyname (str,proto); if (sp) { SETLOPORT(*portRange, ntohs(sp->s_port)); SETNUMPORTS(*portRange, 1); return 0; } /* Not a service, see if it's a single port or port range. */ sep = strchr (str, '-'); if (sep == NULL) { SETLOPORT(*portRange, strtol(str, &end, 10)); if (end != str) { /* Single port. */ SETNUMPORTS(*portRange, 1); return 0; } /* Error in port range field. */ errx (EX_DATAERR, "%s/%s: unknown service", str, proto); } /* Port range, get the values and sanity check. */ sscanf (str, "%hu-%hu", &loPort, &hiPort); SETLOPORT(*portRange, loPort); SETNUMPORTS(*portRange, 0); /* Error by default */ if (loPort <= hiPort) SETNUMPORTS(*portRange, hiPort - loPort + 1); if (GETNUMPORTS(*portRange) == 0) errx (EX_DATAERR, "invalid port range %s", str); return 0; } static int StrToProto (const char* str) { if (!strcmp (str, "tcp")) return IPPROTO_TCP; if (!strcmp (str, "udp")) return IPPROTO_UDP; errx (EX_DATAERR, "unknown protocol %s. Expected tcp or udp", str); } static int StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, port_range *portRange) { char* ptr; ptr = strchr (str, ':'); if (!ptr) errx (EX_DATAERR, "%s is missing port number", str); *ptr = '\0'; ++ptr; StrToAddr (str, addr); return StrToPortRange (ptr, proto, portRange); } /* End of stuff taken from natd.c. */ #define INC_ARGCV() do { \ (*_av)++; \ (*_ac)--; \ av = *_av; \ ac = *_ac; \ } while(0) /* * The next 3 functions add support for the addr, port and proto redirect and * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect() * and SetupProtoRedirect() from natd.c. * * Every setup_* function fills at least one redirect entry * (struct cfg_redir) and zero or more server pool entry (struct cfg_spool) * in buf. * * The format of data in buf is: * * * cfg_nat cfg_redir cfg_spool ...... cfg_spool * * ------------------------------------- ------------ * | | .....X ... | | | | ..... * ------------------------------------- ...... ------------ * ^ * spool_cnt n=0 ...... n=(X-1) * * len points to the amount of available space in buf * space counts the memory consumed by every function * * XXX - Every function get all the argv params so it * has to check, in optional parameters, that the next * args is a valid option for the redir entry and not * another token. Only redir_port and redir_proto are * affected by this. */ static int setup_redir_addr(char *spool_buf, int len, int *_ac, char ***_av) { char **av, *sep; /* Token separator. */ /* Temporary buffer used to hold server pool ip's. */ char tmp_spool_buf[NAT_BUF_LEN]; int ac, i, space, lsnat; struct cfg_redir *r; struct cfg_spool *tmp; av = *_av; ac = *_ac; space = 0; lsnat = 0; if (len >= SOF_REDIR) { r = (struct cfg_redir *)spool_buf; /* Skip cfg_redir at beginning of buf. */ spool_buf = &spool_buf[SOF_REDIR]; space = SOF_REDIR; len -= SOF_REDIR; } else goto nospace; r->mode = REDIR_ADDR; /* Extract local address. */ if (ac == 0) errx(EX_DATAERR, "redirect_addr: missing local address"); sep = strchr(*av, ','); if (sep) { /* LSNAT redirection syntax. */ r->laddr.s_addr = INADDR_NONE; /* Preserve av, copy spool servers to tmp_spool_buf. */ strncpy(tmp_spool_buf, *av, strlen(*av)+1); lsnat = 1; } else StrToAddr(*av, &r->laddr); INC_ARGCV(); /* Extract public address. */ if (ac == 0) errx(EX_DATAERR, "redirect_addr: missing public address"); StrToAddr(*av, &r->paddr); INC_ARGCV(); /* Setup LSNAT server pool. */ if (sep) { sep = strtok(tmp_spool_buf, ","); while (sep != NULL) { tmp = (struct cfg_spool *)spool_buf; if (len < SOF_SPOOL) goto nospace; len -= SOF_SPOOL; space += SOF_SPOOL; StrToAddr(sep, &tmp->addr); tmp->port = ~0; r->spool_cnt++; /* Point to the next possible cfg_spool. */ spool_buf = &spool_buf[SOF_SPOOL]; sep = strtok(NULL, ","); } } return(space); nospace: errx(EX_DATAERR, "redirect_addr: buf is too small\n"); } static int setup_redir_port(char *spool_buf, int len, int *_ac, char ***_av) { char **av, *sep, *protoName; char tmp_spool_buf[NAT_BUF_LEN]; int ac, space, lsnat; struct cfg_redir *r; struct cfg_spool *tmp; u_short numLocalPorts; port_range portRange; av = *_av; ac = *_ac; space = 0; lsnat = 0; numLocalPorts = 0; if (len >= SOF_REDIR) { r = (struct cfg_redir *)spool_buf; /* Skip cfg_redir at beginning of buf. */ spool_buf = &spool_buf[SOF_REDIR]; space = SOF_REDIR; len -= SOF_REDIR; } else goto nospace; r->mode = REDIR_PORT; /* * Extract protocol. */ if (ac == 0) errx (EX_DATAERR, "redirect_port: missing protocol"); r->proto = StrToProto(*av); protoName = *av; INC_ARGCV(); /* * Extract local address. */ if (ac == 0) errx (EX_DATAERR, "redirect_port: missing local address"); sep = strchr(*av, ','); /* LSNAT redirection syntax. */ if (sep) { r->laddr.s_addr = INADDR_NONE; r->lport = ~0; numLocalPorts = 1; /* Preserve av, copy spool servers to tmp_spool_buf. */ strncpy(tmp_spool_buf, *av, strlen(*av)+1); lsnat = 1; } else { if (StrToAddrAndPortRange (*av, &r->laddr, protoName, &portRange) != 0) errx(EX_DATAERR, "redirect_port:" "invalid local port range"); r->lport = GETLOPORT(portRange); numLocalPorts = GETNUMPORTS(portRange); } INC_ARGCV(); /* * Extract public port and optionally address. */ if (ac == 0) errx (EX_DATAERR, "redirect_port: missing public port"); sep = strchr (*av, ':'); if (sep) { if (StrToAddrAndPortRange (*av, &r->paddr, protoName, &portRange) != 0) errx(EX_DATAERR, "redirect_port:" "invalid public port range"); } else { r->paddr.s_addr = INADDR_ANY; if (StrToPortRange (*av, protoName, &portRange) != 0) errx(EX_DATAERR, "redirect_port:" "invalid public port range"); } r->pport = GETLOPORT(portRange); r->pport_cnt = GETNUMPORTS(portRange); INC_ARGCV(); /* * Extract remote address and optionally port. */ /* * NB: isalpha(**av) => we've to check that next parameter is really an * option for this redirect entry, else stop here processing arg[cv]. */ if (ac != 0 && !isalpha(**av)) { sep = strchr (*av, ':'); if (sep) { if (StrToAddrAndPortRange (*av, &r->raddr, protoName, &portRange) != 0) errx(EX_DATAERR, "redirect_port:" "invalid remote port range"); } else { SETLOPORT(portRange, 0); SETNUMPORTS(portRange, 1); StrToAddr (*av, &r->raddr); } INC_ARGCV(); } else { SETLOPORT(portRange, 0); SETNUMPORTS(portRange, 1); r->raddr.s_addr = INADDR_ANY; } r->rport = GETLOPORT(portRange); r->rport_cnt = GETNUMPORTS(portRange); /* * Make sure port ranges match up, then add the redirect ports. */ if (numLocalPorts != r->pport_cnt) errx(EX_DATAERR, "redirect_port:" "port ranges must be equal in size"); /* Remote port range is allowed to be '0' which means all ports. */ if (r->rport_cnt != numLocalPorts && (r->rport_cnt != 1 || r->rport != 0)) errx(EX_DATAERR, "redirect_port: remote port must" "be 0 or equal to local port range in size"); /* * Setup LSNAT server pool. */ if (lsnat) { sep = strtok(tmp_spool_buf, ","); while (sep != NULL) { tmp = (struct cfg_spool *)spool_buf; if (len < SOF_SPOOL) goto nospace; len -= SOF_SPOOL; space += SOF_SPOOL; if (StrToAddrAndPortRange(sep, &tmp->addr, protoName, &portRange) != 0) errx(EX_DATAERR, "redirect_port:" "invalid local port range"); if (GETNUMPORTS(portRange) != 1) errx(EX_DATAERR, "redirect_port: local port" "must be single in this context"); tmp->port = GETLOPORT(portRange); r->spool_cnt++; /* Point to the next possible cfg_spool. */ spool_buf = &spool_buf[SOF_SPOOL]; sep = strtok(NULL, ","); } } return (space); nospace: errx(EX_DATAERR, "redirect_port: buf is too small\n"); } static int setup_redir_proto(char *spool_buf, int len, int *_ac, char ***_av) { char **av; int ac, i, space; struct protoent *protoent; struct cfg_redir *r; av = *_av; ac = *_ac; if (len >= SOF_REDIR) { r = (struct cfg_redir *)spool_buf; /* Skip cfg_redir at beginning of buf. */ spool_buf = &spool_buf[SOF_REDIR]; space = SOF_REDIR; len -= SOF_REDIR; } else goto nospace; r->mode = REDIR_PROTO; /* * Extract protocol. */ if (ac == 0) errx(EX_DATAERR, "redirect_proto: missing protocol"); protoent = getprotobyname(*av); if (protoent == NULL) errx(EX_DATAERR, "redirect_proto: unknown protocol %s", *av); else r->proto = protoent->p_proto; INC_ARGCV(); /* * Extract local address. */ if (ac == 0) errx(EX_DATAERR, "redirect_proto: missing local address"); else StrToAddr(*av, &r->laddr); INC_ARGCV(); /* * Extract optional public address. */ if (ac == 0) { r->paddr.s_addr = INADDR_ANY; r->raddr.s_addr = INADDR_ANY; } else { /* see above in setup_redir_port() */ if (!isalpha(**av)) { StrToAddr(*av, &r->paddr); INC_ARGCV(); /* * Extract optional remote address. */ /* see above in setup_redir_port() */ if (ac!=0 && !isalpha(**av)) { StrToAddr(*av, &r->raddr); INC_ARGCV(); } } } return (space); nospace: errx(EX_DATAERR, "redirect_proto: buf is too small\n"); } static void show_nat(int ac, char **av); static void print_nat_config(char *buf) { struct cfg_nat *n; int i, cnt, flag, off; struct cfg_redir *t; struct cfg_spool *s; struct protoent *p; n = (struct cfg_nat *)buf; flag = 1; off = sizeof(*n); printf("ipfw nat %u config", n->id); if (strlen(n->if_name) != 0) printf(" if %s", n->if_name); else if (n->ip.s_addr != 0) printf(" ip %s", inet_ntoa(n->ip)); while (n->mode != 0) { if (n->mode & PKT_ALIAS_LOG) { printf(" log"); n->mode &= ~PKT_ALIAS_LOG; } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { printf(" deny_in"); n->mode &= ~PKT_ALIAS_DENY_INCOMING; } else if (n->mode & PKT_ALIAS_SAME_PORTS) { printf(" same_ports"); n->mode &= ~PKT_ALIAS_SAME_PORTS; } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { printf(" unreg_only"); n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { printf(" reset"); n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; } else if (n->mode & PKT_ALIAS_REVERSE) { printf(" reverse"); n->mode &= ~PKT_ALIAS_REVERSE; } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { printf(" proxy_only"); n->mode &= ~PKT_ALIAS_PROXY_ONLY; } } /* Print all the redirect's data configuration. */ for (cnt = 0; cnt < n->redir_cnt; cnt++) { t = (struct cfg_redir *)&buf[off]; off += SOF_REDIR; switch (t->mode) { case REDIR_ADDR: printf(" redirect_addr"); if (t->spool_cnt == 0) printf(" %s", inet_ntoa(t->laddr)); else for (i = 0; i < t->spool_cnt; i++) { s = (struct cfg_spool *)&buf[off]; if (i) printf(","); else printf(" "); printf("%s", inet_ntoa(s->addr)); off += SOF_SPOOL; } printf(" %s", inet_ntoa(t->paddr)); break; case REDIR_PORT: p = getprotobynumber(t->proto); printf(" redirect_port %s ", p->p_name); if (!t->spool_cnt) { printf("%s:%u", inet_ntoa(t->laddr), t->lport); if (t->pport_cnt > 1) printf("-%u", t->lport + t->pport_cnt - 1); } else for (i=0; i < t->spool_cnt; i++) { s = (struct cfg_spool *)&buf[off]; if (i) printf(","); printf("%s:%u", inet_ntoa(s->addr), s->port); off += SOF_SPOOL; } printf(" "); if (t->paddr.s_addr) printf("%s:", inet_ntoa(t->paddr)); printf("%u", t->pport); if (!t->spool_cnt && t->pport_cnt > 1) printf("-%u", t->pport + t->pport_cnt - 1); if (t->raddr.s_addr) { printf(" %s", inet_ntoa(t->raddr)); if (t->rport) { printf(":%u", t->rport); if (!t->spool_cnt && t->rport_cnt > 1) printf("-%u", t->rport + t->rport_cnt - 1); } } break; case REDIR_PROTO: p = getprotobynumber(t->proto); printf(" redirect_proto %s %s", p->p_name, inet_ntoa(t->laddr)); if (t->paddr.s_addr != 0) { printf(" %s", inet_ntoa(t->paddr)); if (t->raddr.s_addr) printf(" %s", inet_ntoa(t->raddr)); } break; default: errx(EX_DATAERR, "unknown redir mode"); break; } } printf("\n"); } static void config_nat(int ac, char **av) { struct cfg_nat *n; /* Nat instance configuration. */ struct in_addr ip; int i, len, off, tok; char *id, buf[NAT_BUF_LEN]; /* Buffer for serialized data. */ len = NAT_BUF_LEN; /* Offset in buf: save space for n at the beginning. */ off = sizeof(*n); memset(buf, 0, sizeof(buf)); n = (struct cfg_nat *)buf; av++; ac--; /* Nat id. */ if (ac && isdigit(**av)) { id = *av; i = atoi(*av); ac--; av++; n->id = i; } else errx(EX_DATAERR, "missing nat id"); if (ac == 0) errx(EX_DATAERR, "missing option"); while (ac > 0) { tok = match_token(nat_params, *av); ac--; av++; switch (tok) { case TOK_IP: if (ac == 0) errx(EX_DATAERR, "missing option"); if (!inet_aton(av[0], &(n->ip))) errx(EX_DATAERR, "bad ip address ``%s''", av[0]); ac--; av++; break; case TOK_IF: set_addr_dynamic(av[0], n); ac--; av++; break; case TOK_ALOG: n->mode |= PKT_ALIAS_LOG; break; case TOK_DENY_INC: n->mode |= PKT_ALIAS_DENY_INCOMING; break; case TOK_SAME_PORTS: n->mode |= PKT_ALIAS_SAME_PORTS; break; case TOK_UNREG_ONLY: n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; break; case TOK_RESET_ADDR: n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; break; case TOK_ALIAS_REV: n->mode |= PKT_ALIAS_REVERSE; break; case TOK_PROXY_ONLY: n->mode |= PKT_ALIAS_PROXY_ONLY; break; /* * All the setup_redir_* functions work directly in the final * buffer, see above for details. */ case TOK_REDIR_ADDR: case TOK_REDIR_PORT: case TOK_REDIR_PROTO: switch (tok) { case TOK_REDIR_ADDR: i = setup_redir_addr(&buf[off], len, &ac, &av); break; case TOK_REDIR_PORT: i = setup_redir_port(&buf[off], len, &ac, &av); break; case TOK_REDIR_PROTO: i = setup_redir_proto(&buf[off], len, &ac, &av); break; } n->redir_cnt++; off += i; len -= i; break; default: errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); } } i = do_cmd(IP_FW_NAT_CFG, buf, off); if (i) err(1, "setsockopt(%s)", "IP_FW_NAT_CFG"); /* After every modification, we show the resultant rule. */ int _ac = 3; char *_av[] = {"show", "config", id}; show_nat(_ac, _av); } static void config_pipe(int ac, char **av) { struct dn_pipe p; int i; char *end; void *par = NULL; memset(&p, 0, sizeof p); av++; ac--; /* Pipe number */ if (ac && isdigit(**av)) { i = atoi(*av); av++; ac--; if (do_pipe == 1) p.pipe_nr = i; else p.fs.fs_nr = i; } while (ac > 0) { double d; int tok = match_token(dummynet_params, *av); ac--; av++; switch(tok) { case TOK_NOERROR: p.fs.flags_fs |= DN_NOERROR; break; case TOK_PLR: NEED1("plr needs argument 0..1\n"); d = strtod(av[0], NULL); if (d > 1) d = 1; else if (d < 0) d = 0; p.fs.plr = (int)(d*0x7fffffff); ac--; av++; break; case TOK_QUEUE: NEED1("queue needs queue size\n"); end = NULL; p.fs.qsize = strtoul(av[0], &end, 0); if (*end == 'K' || *end == 'k') { p.fs.flags_fs |= DN_QSIZE_IS_BYTES; p.fs.qsize *= 1024; } else if (*end == 'B' || _substrcmp2(end, "by", "bytes") == 0) { p.fs.flags_fs |= DN_QSIZE_IS_BYTES; } ac--; av++; break; case TOK_BUCKETS: NEED1("buckets needs argument\n"); p.fs.rq_size = strtoul(av[0], NULL, 0); ac--; av++; break; case TOK_MASK: NEED1("mask needs mask specifier\n"); /* * per-flow queue, mask is dst_ip, dst_port, * src_ip, src_port, proto measured in bits */ par = NULL; bzero(&p.fs.flow_mask, sizeof(p.fs.flow_mask)); end = NULL; while (ac >= 1) { uint32_t *p32 = NULL; uint16_t *p16 = NULL; uint32_t *p20 = NULL; struct in6_addr *pa6 = NULL; uint32_t a; tok = match_token(dummynet_params, *av); ac--; av++; switch(tok) { case TOK_ALL: /* * special case, all bits significant */ p.fs.flow_mask.dst_ip = ~0; p.fs.flow_mask.src_ip = ~0; p.fs.flow_mask.dst_port = ~0; p.fs.flow_mask.src_port = ~0; p.fs.flow_mask.proto = ~0; n2mask(&(p.fs.flow_mask.dst_ip6), 128); n2mask(&(p.fs.flow_mask.src_ip6), 128); p.fs.flow_mask.flow_id6 = ~0; p.fs.flags_fs |= DN_HAVE_FLOW_MASK; goto end_mask; case TOK_DSTIP: p32 = &p.fs.flow_mask.dst_ip; break; case TOK_SRCIP: p32 = &p.fs.flow_mask.src_ip; break; case TOK_DSTIP6: pa6 = &(p.fs.flow_mask.dst_ip6); break; case TOK_SRCIP6: pa6 = &(p.fs.flow_mask.src_ip6); break; case TOK_FLOWID: p20 = &p.fs.flow_mask.flow_id6; break; case TOK_DSTPORT: p16 = &p.fs.flow_mask.dst_port; break; case TOK_SRCPORT: p16 = &p.fs.flow_mask.src_port; break; case TOK_PROTO: break; default: ac++; av--; /* backtrack */ goto end_mask; } if (ac < 1) errx(EX_USAGE, "mask: value missing"); if (*av[0] == '/') { a = strtoul(av[0]+1, &end, 0); if (pa6 == NULL) a = (a == 32) ? ~0 : (1 << a) - 1; } else a = strtoul(av[0], &end, 0); if (p32 != NULL) *p32 = a; else if (p16 != NULL) { if (a > 0xFFFF) errx(EX_DATAERR, "port mask must be 16 bit"); *p16 = (uint16_t)a; } else if (p20 != NULL) { if (a > 0xfffff) errx(EX_DATAERR, "flow_id mask must be 20 bit"); *p20 = (uint32_t)a; } else if (pa6 != NULL) { if (a < 0 || a > 128) errx(EX_DATAERR, "in6addr invalid mask len"); else n2mask(pa6, a); } else { if (a > 0xFF) errx(EX_DATAERR, "proto mask must be 8 bit"); p.fs.flow_mask.proto = (uint8_t)a; } if (a != 0) p.fs.flags_fs |= DN_HAVE_FLOW_MASK; ac--; av++; } /* end while, config masks */ end_mask: break; case TOK_RED: case TOK_GRED: NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); p.fs.flags_fs |= DN_IS_RED; if (tok == TOK_GRED) p.fs.flags_fs |= DN_IS_GENTLE_RED; /* * the format for parameters is w_q/min_th/max_th/max_p */ if ((end = strsep(&av[0], "/"))) { double w_q = strtod(end, NULL); if (w_q > 1 || w_q <= 0) errx(EX_DATAERR, "0 < w_q <= 1"); p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); } if ((end = strsep(&av[0], "/"))) { p.fs.min_th = strtoul(end, &end, 0); if (*end == 'K' || *end == 'k') p.fs.min_th *= 1024; } if ((end = strsep(&av[0], "/"))) { p.fs.max_th = strtoul(end, &end, 0); if (*end == 'K' || *end == 'k') p.fs.max_th *= 1024; } if ((end = strsep(&av[0], "/"))) { double max_p = strtod(end, NULL); if (max_p > 1 || max_p <= 0) errx(EX_DATAERR, "0 < max_p <= 1"); p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); } ac--; av++; break; case TOK_DROPTAIL: p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); break; case TOK_BW: NEED1("bw needs bandwidth or interface\n"); if (do_pipe != 1) errx(EX_DATAERR, "bandwidth only valid for pipes"); /* * set clocking interface or bandwidth value */ if (av[0][0] >= 'a' && av[0][0] <= 'z') { int l = sizeof(p.if_name)-1; /* interface name */ strncpy(p.if_name, av[0], l); p.if_name[l] = '\0'; p.bandwidth = 0; } else { p.if_name[0] = '\0'; p.bandwidth = strtoul(av[0], &end, 0); if (*end == 'K' || *end == 'k') { end++; p.bandwidth *= 1000; } else if (*end == 'M') { end++; p.bandwidth *= 1000000; } if ((*end == 'B' && _substrcmp2(end, "Bi", "Bit/s") != 0) || _substrcmp2(end, "by", "bytes") == 0) p.bandwidth *= 8; if (p.bandwidth < 0) errx(EX_DATAERR, "bandwidth too large"); } ac--; av++; break; case TOK_DELAY: if (do_pipe != 1) errx(EX_DATAERR, "delay only valid for pipes"); NEED1("delay needs argument 0..10000ms\n"); p.delay = strtoul(av[0], NULL, 0); ac--; av++; break; case TOK_WEIGHT: if (do_pipe == 1) errx(EX_DATAERR,"weight only valid for queues"); NEED1("weight needs argument 0..100\n"); p.fs.weight = strtoul(av[0], &end, 0); ac--; av++; break; case TOK_PIPE: if (do_pipe == 1) errx(EX_DATAERR,"pipe only valid for queues"); NEED1("pipe needs pipe_number\n"); p.fs.parent_nr = strtoul(av[0], &end, 0); ac--; av++; break; default: errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); } } if (do_pipe == 1) { if (p.pipe_nr == 0) errx(EX_DATAERR, "pipe_nr must be > 0"); if (p.delay > 10000) errx(EX_DATAERR, "delay must be < 10000"); } else { /* do_pipe == 2, queue */ if (p.fs.parent_nr == 0) errx(EX_DATAERR, "pipe must be > 0"); if (p.fs.weight >100) errx(EX_DATAERR, "weight must be <= 100"); } if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { if (p.fs.qsize > 1024*1024) errx(EX_DATAERR, "queue size must be < 1MB"); } else { if (p.fs.qsize > 100) errx(EX_DATAERR, "2 <= queue size <= 100"); } if (p.fs.flags_fs & DN_IS_RED) { size_t len; int lookup_depth, avg_pkt_size; double s, idle, weight, w_q; struct clockinfo ck; int t; if (p.fs.min_th >= p.fs.max_th) errx(EX_DATAERR, "min_th %d must be < than max_th %d", p.fs.min_th, p.fs.max_th); if (p.fs.max_th == 0) errx(EX_DATAERR, "max_th must be > 0"); len = sizeof(int); if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", &lookup_depth, &len, NULL, 0) == -1) errx(1, "sysctlbyname(\"%s\")", "net.inet.ip.dummynet.red_lookup_depth"); if (lookup_depth == 0) errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" " must be greater than zero"); len = sizeof(int); if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", &avg_pkt_size, &len, NULL, 0) == -1) errx(1, "sysctlbyname(\"%s\")", "net.inet.ip.dummynet.red_avg_pkt_size"); if (avg_pkt_size == 0) errx(EX_DATAERR, "net.inet.ip.dummynet.red_avg_pkt_size must" " be greater than zero"); len = sizeof(struct clockinfo); if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); /* * Ticks needed for sending a medium-sized packet. * Unfortunately, when we are configuring a WF2Q+ queue, we * do not have bandwidth information, because that is stored * in the parent pipe, and also we have multiple queues * competing for it. So we set s=0, which is not very * correct. But on the other hand, why do we want RED with * WF2Q+ ? */ if (p.bandwidth==0) /* this is a WF2Q+ queue */ s = 0; else s = ck.hz * avg_pkt_size * 8 / p.bandwidth; /* * max idle time (in ticks) before avg queue size becomes 0. * NOTA: (3/w_q) is approx the value x so that * (1-w_q)^x < 10^-3. */ w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); idle = s * 3. / w_q; p.fs.lookup_step = (int)idle / lookup_depth; if (!p.fs.lookup_step) p.fs.lookup_step = 1; weight = 1 - w_q; for (t = p.fs.lookup_step; t > 0; --t) weight *= weight; p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); } i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); if (i) err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); } static void get_mac_addr_mask(char *p, uint8_t *addr, uint8_t *mask) { int i, l; for (i=0; i<6; i++) addr[i] = mask[i] = 0; if (strcmp(p, "any") == 0) return; for (i=0; *p && i<6;i++, p++) { addr[i] = strtol(p, &p, 16); if (*p != ':') /* we start with the mask */ break; } if (*p == '/') { /* mask len */ l = strtol(p+1, &p, 0); for (i=0; l>0; l -=8, i++) mask[i] = (l >=8) ? 0xff : (~0) << (8-l); } else if (*p == '&') { /* mask */ for (i=0, p++; *p && i<6;i++, p++) { mask[i] = strtol(p, &p, 16); if (*p != ':') break; } } else if (*p == '\0') { for (i=0; i<6; i++) mask[i] = 0xff; } for (i=0; i<6; i++) addr[i] &= mask[i]; } /* * helper function, updates the pointer to cmd with the length * of the current command, and also cleans up the first word of * the new command in case it has been clobbered before. */ static ipfw_insn * next_cmd(ipfw_insn *cmd) { cmd += F_LEN(cmd); bzero(cmd, sizeof(*cmd)); return cmd; } /* * Takes arguments and copies them into a comment */ static void fill_comment(ipfw_insn *cmd, int ac, char **av) { int i, l; char *p = (char *)(cmd + 1); cmd->opcode = O_NOP; cmd->len = (cmd->len & (F_NOT | F_OR)); /* Compute length of comment string. */ for (i = 0, l = 0; i < ac; i++) l += strlen(av[i]) + 1; if (l == 0) return; if (l > 84) errx(EX_DATAERR, "comment too long (max 80 chars)"); l = 1 + (l+3)/4; cmd->len = (cmd->len & (F_NOT | F_OR)) | l; for (i = 0; i < ac; i++) { strcpy(p, av[i]); p += strlen(av[i]); *p++ = ' '; } *(--p) = '\0'; } /* * A function to fill simple commands of size 1. * Existing flags are preserved. */ static void fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) { cmd->opcode = opcode; cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; cmd->arg1 = arg; } /* * Fetch and add the MAC address and type, with masks. This generates one or * two microinstructions, and returns the pointer to the last one. */ static ipfw_insn * add_mac(ipfw_insn *cmd, int ac, char *av[]) { ipfw_insn_mac *mac; if (ac < 2) errx(EX_DATAERR, "MAC dst src"); cmd->opcode = O_MACADDR2; cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); mac = (ipfw_insn_mac *)cmd; get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ return cmd; } static ipfw_insn * add_mactype(ipfw_insn *cmd, int ac, char *av) { if (ac < 1) errx(EX_DATAERR, "missing MAC type"); if (strcmp(av, "any") != 0) { /* we have a non-null type */ fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); cmd->opcode = O_MAC_TYPE; return cmd; } else return NULL; } static ipfw_insn * add_proto0(ipfw_insn *cmd, char *av, u_char *protop) { struct protoent *pe; char *ep; int proto; proto = strtol(av, &ep, 10); if (*ep != '\0' || proto <= 0) { if ((pe = getprotobyname(av)) == NULL) return NULL; proto = pe->p_proto; } fill_cmd(cmd, O_PROTO, 0, proto); *protop = proto; return cmd; } static ipfw_insn * add_proto(ipfw_insn *cmd, char *av, u_char *protop) { u_char proto = IPPROTO_IP; if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) ; /* do not set O_IP4 nor O_IP6 */ else if (strcmp(av, "ip4") == 0) /* explicit "just IPv4" rule */ fill_cmd(cmd, O_IP4, 0, 0); else if (strcmp(av, "ip6") == 0) { /* explicit "just IPv6" rule */ proto = IPPROTO_IPV6; fill_cmd(cmd, O_IP6, 0, 0); } else return add_proto0(cmd, av, protop); *protop = proto; return cmd; } static ipfw_insn * add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop) { u_char proto = IPPROTO_IP; if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0) ; /* do not set O_IP4 nor O_IP6 */ else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0) /* explicit "just IPv4" rule */ fill_cmd(cmd, O_IP4, 0, 0); else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) { /* explicit "just IPv6" rule */ proto = IPPROTO_IPV6; fill_cmd(cmd, O_IP6, 0, 0); } else return add_proto0(cmd, av, protop); *protop = proto; return cmd; } static ipfw_insn * add_srcip(ipfw_insn *cmd, char *av) { fill_ip((ipfw_insn_ip *)cmd, av); if (cmd->opcode == O_IP_DST_SET) /* set */ cmd->opcode = O_IP_SRC_SET; else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ cmd->opcode = O_IP_SRC_LOOKUP; else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ cmd->opcode = O_IP_SRC_ME; else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ cmd->opcode = O_IP_SRC; else /* addr/mask */ cmd->opcode = O_IP_SRC_MASK; return cmd; } static ipfw_insn * add_dstip(ipfw_insn *cmd, char *av) { fill_ip((ipfw_insn_ip *)cmd, av); if (cmd->opcode == O_IP_DST_SET) /* set */ ; else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ ; else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ cmd->opcode = O_IP_DST_ME; else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ cmd->opcode = O_IP_DST; else /* addr/mask */ cmd->opcode = O_IP_DST_MASK; return cmd; } static ipfw_insn * add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) { if (_substrcmp(av, "any") == 0) { return NULL; } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { /* XXX todo: check that we have a protocol with ports */ cmd->opcode = opcode; return cmd; } return NULL; } static ipfw_insn * add_src(ipfw_insn *cmd, char *av, u_char proto) { struct in6_addr a; char *host, *ch; ipfw_insn *ret = NULL; if ((host = strdup(av)) == NULL) return NULL; if ((ch = strrchr(host, '/')) != NULL) *ch = '\0'; if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || inet_pton(AF_INET6, host, &a)) ret = add_srcip6(cmd, av); /* XXX: should check for IPv4, not !IPv6 */ if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || !inet_pton(AF_INET6, host, &a))) ret = add_srcip(cmd, av); if (ret == NULL && strcmp(av, "any") != 0) ret = cmd; free(host); return ret; } static ipfw_insn * add_dst(ipfw_insn *cmd, char *av, u_char proto) { struct in6_addr a; char *host, *ch; ipfw_insn *ret = NULL; if ((host = strdup(av)) == NULL) return NULL; if ((ch = strrchr(host, '/')) != NULL) *ch = '\0'; if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || inet_pton(AF_INET6, host, &a)) ret = add_dstip6(cmd, av); /* XXX: should check for IPv4, not !IPv6 */ if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || !inet_pton(AF_INET6, host, &a))) ret = add_dstip(cmd, av); if (ret == NULL && strcmp(av, "any") != 0) ret = cmd; free(host); return ret; } /* * Parse arguments and assemble the microinstructions which make up a rule. * Rules are added into the 'rulebuf' and then copied in the correct order * into the actual rule. * * The syntax for a rule starts with the action, followed by * optional action parameters, and the various match patterns. * In the assembled microcode, the first opcode must be an O_PROBE_STATE * (generated if the rule includes a keep-state option), then the * various match patterns, log/altq actions, and the actual action. * */ static void add(int ac, char *av[]) { /* * rules are added into the 'rulebuf' and then copied in * the correct order into the actual rule. * Some things that need to go out of order (prob, action etc.) * go into actbuf[]. */ static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; ipfw_insn *first_cmd; /* first match pattern */ struct ip_fw *rule; /* * various flags used to record that we entered some fields. */ ipfw_insn *have_state = NULL; /* check-state or keep-state */ ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL; size_t len; int i; int open_par = 0; /* open parenthesis ( */ /* proto is here because it is used to fetch ports */ u_char proto = IPPROTO_IP; /* default protocol */ double match_prob = 1; /* match probability, default is always match */ bzero(actbuf, sizeof(actbuf)); /* actions go here */ bzero(cmdbuf, sizeof(cmdbuf)); bzero(rulebuf, sizeof(rulebuf)); rule = (struct ip_fw *)rulebuf; cmd = (ipfw_insn *)cmdbuf; action = (ipfw_insn *)actbuf; av++; ac--; /* [rule N] -- Rule number optional */ if (ac && isdigit(**av)) { rule->rulenum = atoi(*av); av++; ac--; } /* [set N] -- set number (0..RESVD_SET), optional */ if (ac > 1 && _substrcmp(*av, "set") == 0) { int set = strtoul(av[1], NULL, 10); if (set < 0 || set > RESVD_SET) errx(EX_DATAERR, "illegal set %s", av[1]); rule->set = set; av += 2; ac -= 2; } /* [prob D] -- match probability, optional */ if (ac > 1 && _substrcmp(*av, "prob") == 0) { match_prob = strtod(av[1], NULL); if (match_prob <= 0 || match_prob > 1) errx(EX_DATAERR, "illegal match prob. %s", av[1]); av += 2; ac -= 2; } /* action -- mandatory */ NEED1("missing action"); i = match_token(rule_actions, *av); ac--; av++; action->len = 1; /* default */ switch(i) { case TOK_CHECKSTATE: have_state = action; action->opcode = O_CHECK_STATE; break; case TOK_ACCEPT: action->opcode = O_ACCEPT; break; case TOK_DENY: action->opcode = O_DENY; action->arg1 = 0; break; case TOK_REJECT: action->opcode = O_REJECT; action->arg1 = ICMP_UNREACH_HOST; break; case TOK_RESET: action->opcode = O_REJECT; action->arg1 = ICMP_REJECT_RST; break; case TOK_RESET6: action->opcode = O_UNREACH6; action->arg1 = ICMP6_UNREACH_RST; break; case TOK_UNREACH: action->opcode = O_REJECT; NEED1("missing reject code"); fill_reject_code(&action->arg1, *av); ac--; av++; break; case TOK_UNREACH6: action->opcode = O_UNREACH6; NEED1("missing unreach code"); fill_unreach6_code(&action->arg1, *av); ac--; av++; break; case TOK_COUNT: action->opcode = O_COUNT; break; case TOK_QUEUE: action->opcode = O_QUEUE; goto chkarg; case TOK_PIPE: action->opcode = O_PIPE; goto chkarg; case TOK_SKIPTO: action->opcode = O_SKIPTO; goto chkarg; case TOK_NETGRAPH: action->opcode = O_NETGRAPH; goto chkarg; case TOK_NGTEE: action->opcode = O_NGTEE; goto chkarg; case TOK_DIVERT: action->opcode = O_DIVERT; goto chkarg; case TOK_TEE: action->opcode = O_TEE; chkarg: if (!ac) errx(EX_USAGE, "missing argument for %s", *(av - 1)); if (isdigit(**av)) { action->arg1 = strtoul(*av, NULL, 10); if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG) errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); } else if (_substrcmp(*av, TABLEARG) == 0) { action->arg1 = IP_FW_TABLEARG; } else if (i == TOK_DIVERT || i == TOK_TEE) { struct servent *s; setservent(1); s = getservbyname(av[0], "divert"); if (s != NULL) action->arg1 = ntohs(s->s_port); else errx(EX_DATAERR, "illegal divert/tee port"); } else errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); ac--; av++; break; case TOK_FORWARD: { ipfw_insn_sa *p = (ipfw_insn_sa *)action; char *s, *end; NEED1("missing forward address[:port]"); action->opcode = O_FORWARD_IP; action->len = F_INSN_SIZE(ipfw_insn_sa); p->sa.sin_len = sizeof(struct sockaddr_in); p->sa.sin_family = AF_INET; p->sa.sin_port = 0; /* * locate the address-port separator (':' or ',') */ s = strchr(*av, ':'); if (s == NULL) s = strchr(*av, ','); if (s != NULL) { *(s++) = '\0'; i = strtoport(s, &end, 0 /* base */, 0 /* proto */); if (s == end) errx(EX_DATAERR, "illegal forwarding port ``%s''", s); p->sa.sin_port = (u_short)i; } if (_substrcmp(*av, "tablearg") == 0) p->sa.sin_addr.s_addr = INADDR_ANY; else lookup_host(*av, &(p->sa.sin_addr)); ac--; av++; break; } case TOK_COMMENT: /* pretend it is a 'count' rule followed by the comment */ action->opcode = O_COUNT; ac++; av--; /* go back... */ break; case TOK_NAT: action->opcode = O_NAT; action->len = F_INSN_SIZE(ipfw_insn_nat); NEED1("missing nat number"); action->arg1 = strtoul(*av, NULL, 10); ac--; av++; break; default: errx(EX_DATAERR, "invalid action %s\n", av[-1]); } action = next_cmd(action); /* * [altq queuename] -- altq tag, optional * [log [logamount N]] -- log, optional * * If they exist, it go first in the cmdbuf, but then it is * skipped in the copy section to the end of the buffer. */ while (ac != 0 && (i = match_token(rule_action_params, *av)) != -1) { ac--; av++; switch (i) { case TOK_LOG: { ipfw_insn_log *c = (ipfw_insn_log *)cmd; int l; if (have_log) errx(EX_DATAERR, "log cannot be specified more than once"); have_log = (ipfw_insn *)c; cmd->len = F_INSN_SIZE(ipfw_insn_log); cmd->opcode = O_LOG; if (ac && _substrcmp(*av, "logamount") == 0) { ac--; av++; NEED1("logamount requires argument"); l = atoi(*av); if (l < 0) errx(EX_DATAERR, "logamount must be positive"); c->max_log = l; ac--; av++; } else { len = sizeof(c->max_log); if (sysctlbyname("net.inet.ip.fw.verbose_limit", &c->max_log, &len, NULL, 0) == -1) errx(1, "sysctlbyname(\"%s\")", "net.inet.ip.fw.verbose_limit"); } } break; case TOK_ALTQ: { ipfw_insn_altq *a = (ipfw_insn_altq *)cmd; NEED1("missing altq queue name"); if (have_altq) errx(EX_DATAERR, "altq cannot be specified more than once"); have_altq = (ipfw_insn *)a; cmd->len = F_INSN_SIZE(ipfw_insn_altq); cmd->opcode = O_ALTQ; fill_altq_qid(&a->qid, *av); ac--; av++; } break; case TOK_TAG: case TOK_UNTAG: { uint16_t tag; if (have_tag) errx(EX_USAGE, "tag and untag cannot be " "specified more than once"); GET_UINT_ARG(tag, 1, 65534, i, rule_action_params); have_tag = cmd; fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); ac--; av++; break; } default: abort(); } cmd = next_cmd(cmd); } if (have_state) /* must be a check-state, we are done */ goto done; #define OR_START(target) \ if (ac && (*av[0] == '(' || *av[0] == '{')) { \ if (open_par) \ errx(EX_USAGE, "nested \"(\" not allowed\n"); \ prev = NULL; \ open_par = 1; \ if ( (av[0])[1] == '\0') { \ ac--; av++; \ } else \ (*av)++; \ } \ target: \ #define CLOSE_PAR \ if (open_par) { \ if (ac && ( \ strcmp(*av, ")") == 0 || \ strcmp(*av, "}") == 0)) { \ prev = NULL; \ open_par = 0; \ ac--; av++; \ } else \ errx(EX_USAGE, "missing \")\"\n"); \ } #define NOT_BLOCK \ if (ac && _substrcmp(*av, "not") == 0) { \ if (cmd->len & F_NOT) \ errx(EX_USAGE, "double \"not\" not allowed\n"); \ cmd->len |= F_NOT; \ ac--; av++; \ } #define OR_BLOCK(target) \ if (ac && _substrcmp(*av, "or") == 0) { \ if (prev == NULL || open_par == 0) \ errx(EX_DATAERR, "invalid OR block"); \ prev->len |= F_OR; \ ac--; av++; \ goto target; \ } \ CLOSE_PAR; first_cmd = cmd; #if 0 /* * MAC addresses, optional. * If we have this, we skip the part "proto from src to dst" * and jump straight to the option parsing. */ NOT_BLOCK; NEED1("missing protocol"); if (_substrcmp(*av, "MAC") == 0 || _substrcmp(*av, "mac") == 0) { ac--; av++; /* the "MAC" keyword */ add_mac(cmd, ac, av); /* exits in case of errors */ cmd = next_cmd(cmd); ac -= 2; av += 2; /* dst-mac and src-mac */ NOT_BLOCK; NEED1("missing mac type"); if (add_mactype(cmd, ac, av[0])) cmd = next_cmd(cmd); ac--; av++; /* any or mac-type */ goto read_options; } #endif /* * protocol, mandatory */ OR_START(get_proto); NOT_BLOCK; NEED1("missing protocol"); if (add_proto_compat(cmd, *av, &proto)) { av++; ac--; if (F_LEN(cmd) != 0) { prev = cmd; cmd = next_cmd(cmd); } } else if (first_cmd != cmd) { errx(EX_DATAERR, "invalid protocol ``%s''", *av); } else goto read_options; OR_BLOCK(get_proto); /* * "from", mandatory */ if (!ac || _substrcmp(*av, "from") != 0) errx(EX_USAGE, "missing ``from''"); ac--; av++; /* * source IP, mandatory */ OR_START(source_ip); NOT_BLOCK; /* optional "not" */ NEED1("missing source address"); if (add_src(cmd, *av, proto)) { ac--; av++; if (F_LEN(cmd) != 0) { /* ! any */ prev = cmd; cmd = next_cmd(cmd); } } else errx(EX_USAGE, "bad source address %s", *av); OR_BLOCK(source_ip); /* * source ports, optional */ NOT_BLOCK; /* optional "not" */ if (ac) { if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_SRCPORT)) { ac--; av++; if (F_LEN(cmd) != 0) cmd = next_cmd(cmd); } } /* * "to", mandatory */ if (!ac || _substrcmp(*av, "to") != 0) errx(EX_USAGE, "missing ``to''"); av++; ac--; /* * destination, mandatory */ OR_START(dest_ip); NOT_BLOCK; /* optional "not" */ NEED1("missing dst address"); if (add_dst(cmd, *av, proto)) { ac--; av++; if (F_LEN(cmd) != 0) { /* ! any */ prev = cmd; cmd = next_cmd(cmd); } } else errx( EX_USAGE, "bad destination address %s", *av); OR_BLOCK(dest_ip); /* * dest. ports, optional */ NOT_BLOCK; /* optional "not" */ if (ac) { if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_DSTPORT)) { ac--; av++; if (F_LEN(cmd) != 0) cmd = next_cmd(cmd); } } read_options: if (ac && first_cmd == cmd) { /* * nothing specified so far, store in the rule to ease * printout later. */ rule->_pad = 1; } prev = NULL; while (ac) { char *s; ipfw_insn_u32 *cmd32; /* alias for cmd */ s = *av; cmd32 = (ipfw_insn_u32 *)cmd; if (*s == '!') { /* alternate syntax for NOT */ if (cmd->len & F_NOT) errx(EX_USAGE, "double \"not\" not allowed\n"); cmd->len = F_NOT; s++; } i = match_token(rule_options, s); ac--; av++; switch(i) { case TOK_NOT: if (cmd->len & F_NOT) errx(EX_USAGE, "double \"not\" not allowed\n"); cmd->len = F_NOT; break; case TOK_OR: if (open_par == 0 || prev == NULL) errx(EX_USAGE, "invalid \"or\" block\n"); prev->len |= F_OR; break; case TOK_STARTBRACE: if (open_par) errx(EX_USAGE, "+nested \"(\" not allowed\n"); open_par = 1; break; case TOK_ENDBRACE: if (!open_par) errx(EX_USAGE, "+missing \")\"\n"); open_par = 0; prev = NULL; break; case TOK_IN: fill_cmd(cmd, O_IN, 0, 0); break; case TOK_OUT: cmd->len ^= F_NOT; /* toggle F_NOT */ fill_cmd(cmd, O_IN, 0, 0); break; case TOK_DIVERTED: fill_cmd(cmd, O_DIVERTED, 0, 3); break; case TOK_DIVERTEDLOOPBACK: fill_cmd(cmd, O_DIVERTED, 0, 1); break; case TOK_DIVERTEDOUTPUT: fill_cmd(cmd, O_DIVERTED, 0, 2); break; case TOK_FRAG: fill_cmd(cmd, O_FRAG, 0, 0); break; case TOK_LAYER2: fill_cmd(cmd, O_LAYER2, 0, 0); break; case TOK_XMIT: case TOK_RECV: case TOK_VIA: NEED1("recv, xmit, via require interface name" " or address"); fill_iface((ipfw_insn_if *)cmd, av[0]); ac--; av++; if (F_LEN(cmd) == 0) /* not a valid address */ break; if (i == TOK_XMIT) cmd->opcode = O_XMIT; else if (i == TOK_RECV) cmd->opcode = O_RECV; else if (i == TOK_VIA) cmd->opcode = O_VIA; break; case TOK_ICMPTYPES: NEED1("icmptypes requires list of types"); fill_icmptypes((ipfw_insn_u32 *)cmd, *av); av++; ac--; break; case TOK_ICMP6TYPES: NEED1("icmptypes requires list of types"); fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av); av++; ac--; break; case TOK_IPTTL: NEED1("ipttl requires TTL"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_IPTTL)) errx(EX_DATAERR, "invalid ipttl %s", *av); } else fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); ac--; av++; break; case TOK_IPID: NEED1("ipid requires id"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_IPID)) errx(EX_DATAERR, "invalid ipid %s", *av); } else fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); ac--; av++; break; case TOK_IPLEN: NEED1("iplen requires length"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_IPLEN)) errx(EX_DATAERR, "invalid ip len %s", *av); } else fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); ac--; av++; break; case TOK_IPVER: NEED1("ipver requires version"); fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); ac--; av++; break; case TOK_IPPRECEDENCE: NEED1("ipprecedence requires value"); fill_cmd(cmd, O_IPPRECEDENCE, 0, (strtoul(*av, NULL, 0) & 7) << 5); ac--; av++; break; case TOK_IPOPTS: NEED1("missing argument for ipoptions"); fill_flags(cmd, O_IPOPT, f_ipopts, *av); ac--; av++; break; case TOK_IPTOS: NEED1("missing argument for iptos"); fill_flags(cmd, O_IPTOS, f_iptos, *av); ac--; av++; break; case TOK_UID: NEED1("uid requires argument"); { char *end; uid_t uid; struct passwd *pwd; cmd->opcode = O_UID; uid = strtoul(*av, &end, 0); pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); if (pwd == NULL) errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); cmd32->d[0] = pwd->pw_uid; cmd->len |= F_INSN_SIZE(ipfw_insn_u32); ac--; av++; } break; case TOK_GID: NEED1("gid requires argument"); { char *end; gid_t gid; struct group *grp; cmd->opcode = O_GID; gid = strtoul(*av, &end, 0); grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); if (grp == NULL) errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); cmd32->d[0] = grp->gr_gid; cmd->len |= F_INSN_SIZE(ipfw_insn_u32); ac--; av++; } break; case TOK_JAIL: NEED1("jail requires argument"); { char *end; int jid; cmd->opcode = O_JAIL; jid = (int)strtol(*av, &end, 0); if (jid < 0 || *end != '\0') errx(EX_DATAERR, "jail requires prison ID"); cmd32->d[0] = (uint32_t)jid; cmd->len |= F_INSN_SIZE(ipfw_insn_u32); ac--; av++; } break; case TOK_ESTAB: fill_cmd(cmd, O_ESTAB, 0, 0); break; case TOK_SETUP: fill_cmd(cmd, O_TCPFLAGS, 0, (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); break; case TOK_TCPDATALEN: NEED1("tcpdatalen requires length"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_TCPDATALEN)) errx(EX_DATAERR, "invalid tcpdata len %s", *av); } else fill_cmd(cmd, O_TCPDATALEN, 0, strtoul(*av, NULL, 0)); ac--; av++; break; case TOK_TCPOPTS: NEED1("missing argument for tcpoptions"); fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); ac--; av++; break; case TOK_TCPSEQ: case TOK_TCPACK: NEED1("tcpseq/tcpack requires argument"); cmd->len = F_INSN_SIZE(ipfw_insn_u32); cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); ac--; av++; break; case TOK_TCPWIN: NEED1("tcpwin requires length"); fill_cmd(cmd, O_TCPWIN, 0, htons(strtoul(*av, NULL, 0))); ac--; av++; break; case TOK_TCPFLAGS: NEED1("missing argument for tcpflags"); cmd->opcode = O_TCPFLAGS; fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); ac--; av++; break; case TOK_KEEPSTATE: if (open_par) errx(EX_USAGE, "keep-state cannot be part " "of an or block"); if (have_state) errx(EX_USAGE, "only one of keep-state " "and limit is allowed"); have_state = cmd; fill_cmd(cmd, O_KEEP_STATE, 0, 0); break; case TOK_LIMIT: { ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; int val; if (open_par) errx(EX_USAGE, "limit cannot be part of an or block"); if (have_state) errx(EX_USAGE, "only one of keep-state and " "limit is allowed"); have_state = cmd; cmd->len = F_INSN_SIZE(ipfw_insn_limit); cmd->opcode = O_LIMIT; c->limit_mask = c->conn_limit = 0; while (ac > 0) { if ((val = match_token(limit_masks, *av)) <= 0) break; c->limit_mask |= val; ac--; av++; } if (c->limit_mask == 0) errx(EX_USAGE, "limit: missing limit mask"); GET_UINT_ARG(c->conn_limit, 1, 65534, TOK_LIMIT, rule_options); ac--; av++; break; } case TOK_PROTO: NEED1("missing protocol"); if (add_proto(cmd, *av, &proto)) { ac--; av++; } else errx(EX_DATAERR, "invalid protocol ``%s''", *av); break; case TOK_SRCIP: NEED1("missing source IP"); if (add_srcip(cmd, *av)) { ac--; av++; } break; case TOK_DSTIP: NEED1("missing destination IP"); if (add_dstip(cmd, *av)) { ac--; av++; } break; case TOK_SRCIP6: NEED1("missing source IP6"); if (add_srcip6(cmd, *av)) { ac--; av++; } break; case TOK_DSTIP6: NEED1("missing destination IP6"); if (add_dstip6(cmd, *av)) { ac--; av++; } break; case TOK_SRCPORT: NEED1("missing source port"); if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_SRCPORT)) { ac--; av++; } else errx(EX_DATAERR, "invalid source port %s", *av); break; case TOK_DSTPORT: NEED1("missing destination port"); if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_DSTPORT)) { ac--; av++; } else errx(EX_DATAERR, "invalid destination port %s", *av); break; case TOK_MAC: if (add_mac(cmd, ac, av)) { ac -= 2; av += 2; } break; case TOK_MACTYPE: NEED1("missing mac type"); if (!add_mactype(cmd, ac, *av)) errx(EX_DATAERR, "invalid mac type %s", *av); ac--; av++; break; case TOK_VERREVPATH: fill_cmd(cmd, O_VERREVPATH, 0, 0); break; case TOK_VERSRCREACH: fill_cmd(cmd, O_VERSRCREACH, 0, 0); break; case TOK_ANTISPOOF: fill_cmd(cmd, O_ANTISPOOF, 0, 0); break; case TOK_IPSEC: fill_cmd(cmd, O_IPSEC, 0, 0); break; case TOK_IPV6: fill_cmd(cmd, O_IP6, 0, 0); break; case TOK_IPV4: fill_cmd(cmd, O_IP4, 0, 0); break; case TOK_EXT6HDR: fill_ext6hdr( cmd, *av ); ac--; av++; break; case TOK_FLOWID: if (proto != IPPROTO_IPV6 ) errx( EX_USAGE, "flow-id filter is active " "only for ipv6 protocol\n"); fill_flow6( (ipfw_insn_u32 *) cmd, *av ); ac--; av++; break; case TOK_COMMENT: fill_comment(cmd, ac, av); av += ac; ac = 0; break; case TOK_TAGGED: if (ac > 0 && strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_TAGGED)) errx(EX_DATAERR, "tagged: invalid tag" " list: %s", *av); } else { uint16_t tag; GET_UINT_ARG(tag, 1, 65534, TOK_TAGGED, rule_options); fill_cmd(cmd, O_TAGGED, 0, tag); } ac--; av++; break; default: errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); } if (F_LEN(cmd) > 0) { /* prepare to advance */ prev = cmd; cmd = next_cmd(cmd); } } done: /* * Now copy stuff into the rule. * If we have a keep-state option, the first instruction * must be a PROBE_STATE (which is generated here). * If we have a LOG option, it was stored as the first command, * and now must be moved to the top of the action part. */ dst = (ipfw_insn *)rule->cmd; /* * First thing to write into the command stream is the match probability. */ if (match_prob != 1) { /* 1 means always match */ dst->opcode = O_PROB; dst->len = 2; *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); dst += dst->len; } /* * generate O_PROBE_STATE if necessary */ if (have_state && have_state->opcode != O_CHECK_STATE) { fill_cmd(dst, O_PROBE_STATE, 0, 0); dst = next_cmd(dst); } /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */ for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { i = F_LEN(src); switch (src->opcode) { case O_LOG: case O_KEEP_STATE: case O_LIMIT: case O_ALTQ: case O_TAG: break; default: bcopy(src, dst, i * sizeof(uint32_t)); dst += i; } } /* * put back the have_state command as last opcode */ if (have_state && have_state->opcode != O_CHECK_STATE) { i = F_LEN(have_state); bcopy(have_state, dst, i * sizeof(uint32_t)); dst += i; } /* * start action section */ rule->act_ofs = dst - rule->cmd; /* put back O_LOG, O_ALTQ, O_TAG if necessary */ if (have_log) { i = F_LEN(have_log); bcopy(have_log, dst, i * sizeof(uint32_t)); dst += i; } if (have_altq) { i = F_LEN(have_altq); bcopy(have_altq, dst, i * sizeof(uint32_t)); dst += i; } if (have_tag) { i = F_LEN(have_tag); bcopy(have_tag, dst, i * sizeof(uint32_t)); dst += i; } /* * copy all other actions */ for (src = (ipfw_insn *)actbuf; src != action; src += i) { i = F_LEN(src); bcopy(src, dst, i * sizeof(uint32_t)); dst += i; } rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); i = (char *)dst - (char *)rule; if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); if (!do_quiet) show_ipfw(rule, 0, 0); } static void zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) { int rulenum; int failed = EX_OK; char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; av++; ac--; if (!ac) { /* clear all entries */ if (do_cmd(optname, NULL, 0) < 0) err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); if (!do_quiet) printf("%s.\n", optname == IP_FW_ZERO ? "Accounting cleared":"Logging counts reset"); return; } while (ac) { /* Rule number */ if (isdigit(**av)) { rulenum = atoi(*av); av++; ac--; if (do_cmd(optname, &rulenum, sizeof rulenum)) { warn("rule %u: setsockopt(IP_FW_%s)", rulenum, name); failed = EX_UNAVAILABLE; } else if (!do_quiet) printf("Entry %d %s.\n", rulenum, optname == IP_FW_ZERO ? "cleared" : "logging count reset"); } else { errx(EX_USAGE, "invalid rule number ``%s''", *av); } } if (failed != EX_OK) exit(failed); } static void flush(int force) { int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; if (!force && !do_quiet) { /* need to ask user */ int c; printf("Are you sure? [yn] "); fflush(stdout); do { c = toupper(getc(stdin)); while (c != '\n' && getc(stdin) != '\n') if (feof(stdin)) return; /* and do not flush */ } while (c != 'Y' && c != 'N'); printf("\n"); if (c == 'N') /* user said no */ return; } if (do_cmd(cmd, NULL, 0) < 0) err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", do_pipe ? "DUMMYNET" : "FW"); if (!do_quiet) printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); } /* * Free a the (locally allocated) copy of command line arguments. */ static void free_args(int ac, char **av) { int i; for (i=0; i < ac; i++) free(av[i]); free(av); } /* * This one handles all table-related commands * ipfw table N add addr[/masklen] [value] * ipfw table N delete addr[/masklen] * ipfw table N flush * ipfw table N list */ static void table_handler(int ac, char *av[]) { ipfw_table_entry ent; ipfw_table *tbl; int do_add; char *p; socklen_t l; uint32_t a; ac--; av++; if (ac && isdigit(**av)) { ent.tbl = atoi(*av); ac--; av++; } else errx(EX_USAGE, "table number required"); NEED1("table needs command"); if (_substrcmp(*av, "add") == 0 || _substrcmp(*av, "delete") == 0) { do_add = **av == 'a'; ac--; av++; if (!ac) errx(EX_USAGE, "IP address required"); p = strchr(*av, '/'); if (p) { *p++ = '\0'; ent.masklen = atoi(p); if (ent.masklen > 32) errx(EX_DATAERR, "bad width ``%s''", p); } else ent.masklen = 32; if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0) errx(EX_NOHOST, "hostname ``%s'' unknown", *av); ac--; av++; if (do_add && ac) { unsigned int tval; /* isdigit is a bit of a hack here.. */ if (strchr(*av, (int)'.') == NULL && isdigit(**av)) { ent.value = strtoul(*av, NULL, 0); } else { if (lookup_host(*av, (struct in_addr *)&tval) == 0) { /* The value must be stored in host order * * so that the values < 65k can be distinguished */ ent.value = ntohl(tval); } else { errx(EX_NOHOST, "hostname ``%s'' unknown", *av); } } } else ent.value = 0; if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL, &ent, sizeof(ent)) < 0) { /* If running silent, don't bomb out on these errors. */ if (!(do_quiet && (errno == (do_add ? EEXIST : ESRCH)))) err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)", do_add ? "ADD" : "DEL"); /* In silent mode, react to a failed add by deleting */ if (do_add) { do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent)); if (do_cmd(IP_FW_TABLE_ADD, &ent, sizeof(ent)) < 0) err(EX_OSERR, "setsockopt(IP_FW_TABLE_ADD)"); } } } else if (_substrcmp(*av, "flush") == 0) { if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl, sizeof(ent.tbl)) < 0) err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)"); } else if (_substrcmp(*av, "list") == 0) { a = ent.tbl; l = sizeof(a); if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0) err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)"); l = sizeof(*tbl) + a * sizeof(ipfw_table_entry); tbl = malloc(l); if (tbl == NULL) err(EX_OSERR, "malloc"); tbl->tbl = ent.tbl; if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0) err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)"); for (a = 0; a < tbl->cnt; a++) { /* Heuristic to print it the right way */ /* values < 64k are printed as numbers */ unsigned int tval; tval = tbl->ent[a].value; if (tval > 0xffff) { char tbuf[128]; strncpy(tbuf, inet_ntoa(*(struct in_addr *) &tbl->ent[a].addr), 127); /* inet_ntoa expects host order */ tval = htonl(tval); printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen, inet_ntoa(*(struct in_addr *)&tval)); } else { printf("%s/%u %u\n", inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr), tbl->ent[a].masklen, tbl->ent[a].value); } } } else errx(EX_USAGE, "invalid table command %s", *av); } static void show_nat(int ac, char **av) { struct cfg_nat *n; struct cfg_redir *e; int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size; int nat_cnt, r; uint8_t *data, *p; char **lav, *endptr; do_rule = 0; nalloc = 1024; size = 0; data = NULL; ac--; av++; /* Parse parameters. */ for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) { if (!strncmp(av[0], "config", strlen(av[0]))) { cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1; continue; } /* Convert command line rule #. */ frule = lrule = strtoul(av[0], &endptr, 10); if (*endptr == '-') lrule = strtoul(endptr+1, &endptr, 10); if (lrule == 0) err(EX_USAGE, "invalid rule number: %s", av[0]); do_rule = 1; } nbytes = nalloc; while (nbytes >= nalloc) { nalloc = nalloc * 2; nbytes = nalloc; if ((data = realloc(data, nbytes)) == NULL) err(EX_OSERR, "realloc"); if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0) err(EX_OSERR, "getsockopt(IP_FW_GET_%s)", (cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG"); } if (nbytes == 0) exit(0); if (do_cfg) { nat_cnt = *((int *)data); for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) { n = (struct cfg_nat *)&data[i]; if (do_rule) { if (!(frule <= n->id && lrule >= n->id)) continue; } print_nat_config(&data[i]); i += sizeof(struct cfg_nat); e = (struct cfg_redir *)&data[i]; if (e->mode == REDIR_ADDR || e->mode == REDIR_PORT || e->mode == REDIR_PROTO) i += sizeof(struct cfg_redir) + e->spool_cnt * sizeof(struct cfg_spool); } } else { for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) { p = &data[i]; if (p == data + nbytes) break; bcopy(p, &r, sizeof(int)); if (do_rule) { if (!(frule <= r && lrule >= r)) continue; } printf("nat %u: %s\n", r, p+sizeof(int)); } } } /* * Called with the arguments (excluding program name). * Returns 0 if successful, 1 if empty command, errx() in case of errors. */ static int ipfw_main(int oldac, char **oldav) { int ch, ac, save_ac; char **av, **save_av; int do_acct = 0; /* Show packet/byte count */ #define WHITESP " \t\f\v\n\r" if (oldac == 0) return 1; else if (oldac == 1) { /* * If we are called with a single string, try to split it into * arguments for subsequent parsing. * But first, remove spaces after a ',', by copying the string * in-place. */ char *arg = oldav[0]; /* The string... */ int l = strlen(arg); int copy = 0; /* 1 if we need to copy, 0 otherwise */ int i, j; for (i = j = 0; i < l; i++) { if (arg[i] == '#') /* comment marker */ break; if (copy) { arg[j++] = arg[i]; copy = !index("," WHITESP, arg[i]); } else { copy = !index(WHITESP, arg[i]); if (copy) arg[j++] = arg[i]; } } if (!copy && j > 0) /* last char was a 'blank', remove it */ j--; l = j; /* the new argument length */ arg[j++] = '\0'; if (l == 0) /* empty string! */ return 1; /* * First, count number of arguments. Because of the previous * processing, this is just the number of blanks plus 1. */ for (i = 0, ac = 1; i < l; i++) if (index(WHITESP, arg[i]) != NULL) ac++; av = calloc(ac, sizeof(char *)); /* * Second, copy arguments from cmd[] to av[]. For each one, * j is the initial character, i is the one past the end. */ for (ac = 0, i = j = 0; i < l; i++) if (index(WHITESP, arg[i]) != NULL || i == l-1) { if (i == l-1) i++; av[ac] = calloc(i-j+1, 1); bcopy(arg+j, av[ac], i-j); ac++; j = i + 1; } } else { /* * If an argument ends with ',' join with the next one. */ int first, i, l; av = calloc(oldac, sizeof(char *)); for (first = i = ac = 0, l = 0; i < oldac; i++) { char *arg = oldav[i]; int k = strlen(arg); l += k; if (arg[k-1] != ',' || i == oldac-1) { /* Time to copy. */ av[ac] = calloc(l+1, 1); for (l=0; first <= i; first++) { strcat(av[ac]+l, oldav[first]); l += strlen(oldav[first]); } ac++; l = 0; first = i+1; } } } /* Set the force flag for non-interactive processes */ if (!do_force) do_force = !isatty(STDIN_FILENO); /* Save arguments for final freeing of memory. */ save_ac = ac; save_av = av; optind = optreset = 0; while ((ch = getopt(ac, av, "abcdefhnNqs:STtv")) != -1) switch (ch) { case 'a': do_acct = 1; break; case 'b': comment_only = 1; do_compact = 1; break; case 'c': do_compact = 1; break; case 'd': do_dynamic = 1; break; case 'e': do_expired = 1; break; case 'f': do_force = 1; break; case 'h': /* help */ free_args(save_ac, save_av); help(); break; /* NOTREACHED */ case 'n': test_only = 1; break; case 'N': do_resolv = 1; break; case 'q': do_quiet = 1; break; case 's': /* sort */ do_sort = atoi(optarg); break; case 'S': show_sets = 1; break; case 't': do_time = 1; break; case 'T': do_time = 2; /* numeric timestamp */ break; case 'v': /* verbose */ verbose = 1; break; default: free_args(save_ac, save_av); return 1; } ac -= optind; av += optind; NEED1("bad arguments, for usage summary ``ipfw''"); /* * An undocumented behaviour of ipfw1 was to allow rule numbers first, * e.g. "100 add allow ..." instead of "add 100 allow ...". * In case, swap first and second argument to get the normal form. */ if (ac > 1 && isdigit(*av[0])) { char *p = av[0]; av[0] = av[1]; av[1] = p; } /* * Optional: pipe, queue or nat. */ do_nat = 0; do_pipe = 0; if (!strncmp(*av, "nat", strlen(*av))) do_nat = 1; else if (!strncmp(*av, "pipe", strlen(*av))) do_pipe = 1; else if (_substrcmp(*av, "queue") == 0) do_pipe = 2; if (do_pipe || do_nat) { ac--; av++; } NEED1("missing command"); /* * For pipes, queues and nats we normally say 'nat|pipe NN config' * but the code is easier to parse as 'nat|pipe config NN' * so we swap the two arguments. */ if ((do_pipe || do_nat) && ac > 1 && isdigit(*av[0])) { char *p = av[0]; av[0] = av[1]; av[1] = p; } if (_substrcmp(*av, "add") == 0) add(ac, av); else if (do_nat && _substrcmp(*av, "show") == 0) show_nat(ac, av); else if (do_pipe && _substrcmp(*av, "config") == 0) config_pipe(ac, av); else if (do_nat && _substrcmp(*av, "config") == 0) config_nat(ac, av); else if (_substrcmp(*av, "delete") == 0) delete(ac, av); else if (_substrcmp(*av, "flush") == 0) flush(do_force); else if (_substrcmp(*av, "zero") == 0) zero(ac, av, IP_FW_ZERO); else if (_substrcmp(*av, "resetlog") == 0) zero(ac, av, IP_FW_RESETLOG); else if (_substrcmp(*av, "print") == 0 || _substrcmp(*av, "list") == 0) list(ac, av, do_acct); else if (_substrcmp(*av, "set") == 0) sets_handler(ac, av); else if (_substrcmp(*av, "table") == 0) table_handler(ac, av); else if (_substrcmp(*av, "enable") == 0) sysctl_handler(ac, av, 1); else if (_substrcmp(*av, "disable") == 0) sysctl_handler(ac, av, 0); else if (_substrcmp(*av, "show") == 0) list(ac, av, 1 /* show counters */); else errx(EX_USAGE, "bad command `%s'", *av); /* Free memory allocated in the argument parsing. */ free_args(save_ac, save_av); return 0; } static void ipfw_readfile(int ac, char *av[]) { #define MAX_ARGS 32 char buf[BUFSIZ]; char *cmd = NULL, *filename = av[ac-1]; int c, lineno=0; FILE *f = NULL; pid_t preproc = 0; filename = av[ac-1]; while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { switch(c) { case 'c': do_compact = 1; break; case 'f': do_force = 1; break; case 'N': do_resolv = 1; break; case 'n': test_only = 1; break; case 'p': cmd = optarg; /* * Skip previous args and delete last one, so we * pass all but the last argument to the preprocessor * via av[optind-1] */ av += optind - 1; ac -= optind - 1; if (ac < 2) errx(EX_USAGE, "no filename argument"); av[ac-1] = NULL; fprintf(stderr, "command is %s\n", av[0]); break; case 'q': do_quiet = 1; break; case 'S': show_sets = 1; break; default: errx(EX_USAGE, "bad arguments, for usage" " summary ``ipfw''"); } if (cmd != NULL) break; } if (cmd == NULL && ac != optind + 1) { fprintf(stderr, "ac %d, optind %d\n", ac, optind); errx(EX_USAGE, "extraneous filename arguments"); } if ((f = fopen(filename, "r")) == NULL) err(EX_UNAVAILABLE, "fopen: %s", filename); if (cmd != NULL) { /* pipe through preprocessor */ int pipedes[2]; if (pipe(pipedes) == -1) err(EX_OSERR, "cannot create pipe"); preproc = fork(); if (preproc == -1) err(EX_OSERR, "cannot fork"); if (preproc == 0) { /* * Child, will run the preprocessor with the * file on stdin and the pipe on stdout. */ if (dup2(fileno(f), 0) == -1 || dup2(pipedes[1], 1) == -1) err(EX_OSERR, "dup2()"); fclose(f); close(pipedes[1]); close(pipedes[0]); execvp(cmd, av); err(EX_OSERR, "execvp(%s) failed", cmd); } else { /* parent, will reopen f as the pipe */ fclose(f); close(pipedes[1]); if ((f = fdopen(pipedes[0], "r")) == NULL) { int savederrno = errno; (void)kill(preproc, SIGTERM); errno = savederrno; err(EX_OSERR, "fdopen()"); } } } while (fgets(buf, BUFSIZ, f)) { /* read commands */ char linename[10]; char *args[1]; lineno++; sprintf(linename, "Line %d", lineno); setprogname(linename); /* XXX */ args[0] = buf; ipfw_main(1, args); } fclose(f); if (cmd != NULL) { int status; if (waitpid(preproc, &status, 0) == -1) errx(EX_OSERR, "waitpid()"); if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) errx(EX_UNAVAILABLE, "preprocessor exited with status %d", WEXITSTATUS(status)); else if (WIFSIGNALED(status)) errx(EX_UNAVAILABLE, "preprocessor exited with signal %d", WTERMSIG(status)); } } int main(int ac, char *av[]) { /* * If the last argument is an absolute pathname, interpret it * as a file to be preprocessed. */ if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) ipfw_readfile(ac, av); else { if (ipfw_main(ac-1, av+1)) show_usage(); } return EX_OK; }