/* * 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 "ipfw2.h" #include #include #include #include #include #include #include #include #include #include #include #include /* ctime */ #include /* _long_to_time */ #include #include #include /* offsetof */ #include #include /* only IFNAMSIZ */ #include #include /* only n_short, n_long */ #include #include #include #include #include struct cmdline_opts co; /* global options */ struct format_opts { int bcwidth; int pcwidth; int show_counters; uint32_t set_mask; /* enabled sets mask */ uint32_t flags; /* request flags */ uint32_t first; /* first rule to request */ uint32_t last; /* last rule to request */ uint32_t dcnt; /* number of dynamic states */ ipfw_obj_ctlv *tstate; /* table state data */ }; int resvd_set_number = RESVD_SET; int ipfw_socket = -1; #define CHECK_LENGTH(v, len) do { \ if ((v) < (len)) \ errx(EX_DATAERR, "Rule too long"); \ } while (0) /* * Check if we have enough space in cmd buffer. Note that since * first 8? u32 words are reserved by reserved header, full cmd * buffer can't be used, so we need to protect from buffer overrun * only. At the beginnig, cblen is less than actual buffer size by * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need * for checking small instructions fitting in given range. * We also (ab)use the fact that ipfw_insn is always the first field * for any custom instruction. */ #define CHECK_CMDLEN CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd)) #define GET_UINT_ARG(arg, min, max, tok, s_x) do { \ if (!av[0]) \ errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \ if (_substrcmp(*av, "tablearg") == 0) { \ arg = IP_FW_TARG; \ break; \ } \ \ { \ long _xval; \ char *end; \ \ _xval = strtol(*av, &end, 10); \ \ if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \ errx(EX_DATAERR, "%s: invalid argument: %s", \ match_value(s_x, tok), *av); \ \ if (errno == ERANGE || _xval < min || _xval > max) \ errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \ match_value(s_x, tok), min, max, *av); \ \ if (_xval == IP_FW_TARG) \ errx(EX_DATAERR, "%s: illegal argument value: %s", \ match_value(s_x, tok), *av); \ arg = _xval; \ } \ } while (0) 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_ECN_CE}, { "ecntransport", IPTOS_ECN_ECT0}, { "ip tos option", 0}, { NULL, 0 } }; struct _s_x f_ipdscp[] = { { "af11", IPTOS_DSCP_AF11 >> 2 }, /* 001010 */ { "af12", IPTOS_DSCP_AF12 >> 2 }, /* 001100 */ { "af13", IPTOS_DSCP_AF13 >> 2 }, /* 001110 */ { "af21", IPTOS_DSCP_AF21 >> 2 }, /* 010010 */ { "af22", IPTOS_DSCP_AF22 >> 2 }, /* 010100 */ { "af23", IPTOS_DSCP_AF23 >> 2 }, /* 010110 */ { "af31", IPTOS_DSCP_AF31 >> 2 }, /* 011010 */ { "af32", IPTOS_DSCP_AF32 >> 2 }, /* 011100 */ { "af33", IPTOS_DSCP_AF33 >> 2 }, /* 011110 */ { "af41", IPTOS_DSCP_AF41 >> 2 }, /* 100010 */ { "af42", IPTOS_DSCP_AF42 >> 2 }, /* 100100 */ { "af43", IPTOS_DSCP_AF43 >> 2 }, /* 100110 */ { "be", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ { "ef", IPTOS_DSCP_EF >> 2 }, /* 101110 */ { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */ { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */ { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */ { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */ { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */ { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */ { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */ { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */ { 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 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 }, { "reass", TOK_REASS }, { "setfib", TOK_SETFIB }, { "setdscp", TOK_SETDSCP }, { "call", TOK_CALL }, { "return", TOK_RETURN }, { NULL, 0 } /* terminator */ }; static struct _s_x rule_action_params[] = { { "altq", TOK_ALTQ }, { "log", TOK_LOG }, { "tag", TOK_TAG }, { "untag", TOK_UNTAG }, { NULL, 0 } /* terminator */ }; /* * The 'lookup' instruction accepts one of the following arguments. * -1 is a terminator for the list. * Arguments are passed as v[1] in O_DST_LOOKUP options. */ static int lookup_key[] = { TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT, TOK_UID, TOK_JAIL, TOK_DSCP, -1 }; static 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 }, { "fib", TOK_FIB }, { "ipoptions", TOK_IPOPTS }, { "ipopts", TOK_IPOPTS }, { "iplen", TOK_IPLEN }, { "ipid", TOK_IPID }, { "ipprecedence", TOK_IPPRECEDENCE }, { "dscp", TOK_DSCP }, { "iptos", TOK_IPTOS }, { "ipttl", TOK_IPTTL }, { "ipversion", TOK_IPVER }, { "ipver", TOK_IPVER }, { "estab", TOK_ESTAB }, { "established", TOK_ESTAB }, { "setup", TOK_SETUP }, { "sockarg", TOK_SOCKARG }, { "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}, { "lookup", TOK_LOOKUP}, { "flow", TOK_FLOW}, { "//", 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 */ }; void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg); static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, ipfw_cfg_lheader **pcfg, size_t *psize); static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av); static void ipfw_list_tifaces(void); /* * Simple string buffer API. * Used to simplify buffer passing between function and for * transparent overrun handling. */ /* * Allocates new buffer of given size @sz. * * Returns 0 on success. */ int bp_alloc(struct buf_pr *b, size_t size) { memset(b, 0, sizeof(struct buf_pr)); if ((b->buf = calloc(1, size)) == NULL) return (ENOMEM); b->ptr = b->buf; b->size = size; b->avail = b->size; return (0); } void bp_free(struct buf_pr *b) { free(b->buf); } /* * Flushes buffer so new writer start from beginning. */ void bp_flush(struct buf_pr *b) { b->ptr = b->buf; b->avail = b->size; } /* * Print message specified by @format and args. * Automatically manage buffer space and transparently handle * buffer overruns. * * Returns number of bytes that should have been printed. */ int bprintf(struct buf_pr *b, char *format, ...) { va_list args; int i; va_start(args, format); i = vsnprintf(b->ptr, b->avail, format, args); va_end(args); if (i > b->avail || i < 0) { /* Overflow or print error */ b->avail = 0; } else { b->ptr += i; b->avail -= i; } b->needed += i; return (i); } /* * Special values printer for tablearg-aware opcodes. */ void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg) { if (str != NULL) bprintf(bp, "%s", str); if (arg == IP_FW_TARG) bprintf(bp, "tablearg"); else bprintf(bp, "%u", arg); } /* * Helper routine to print a possibly unaligned uint64_t on * various platform. If width > 0, print the value with * the desired width, followed by a space; * otherwise, return the required width. */ int pr_u64(struct buf_pr *b, uint64_t *pd, int width) { #ifdef TCC #define U64_FMT "I64" #else #define U64_FMT "llu" #endif uint64_t u; unsigned long long d; bcopy (pd, &u, sizeof(u)); d = u; return (width > 0) ? bprintf(b, "%*" U64_FMT " ", width, d) : snprintf(NULL, 0, "%" U64_FMT, d) ; #undef U64_FMT } void * safe_calloc(size_t number, size_t size) { void *ret = calloc(number, size); if (ret == NULL) err(EX_OSERR, "calloc"); return ret; } void * safe_realloc(void *ptr, size_t size) { void *ret = realloc(ptr, size); if (ret == NULL) err(EX_OSERR, "realloc"); return ret; } /* * Compare things like interface or table names. */ int stringnum_cmp(const char *a, const char *b) { int la, lb; la = strlen(a); lb = strlen(b); if (la > lb) return (1); else if (la < lb) return (-01); return (strcmp(a, b)); } /* * conditionally runs the command. * Selected options or negative -> getsockopt */ int do_cmd(int optname, void *optval, uintptr_t optlen) { int i; if (co.test_only) return 0; if (ipfw_socket == -1) ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (ipfw_socket < 0) err(EX_UNAVAILABLE, "socket"); if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || optname == IP_FW_ADD || optname == IP_FW3 || optname == IP_FW_NAT_GET_CONFIG || optname < 0 || optname == IP_FW_NAT_GET_LOG) { if (optname < 0) optname = -optname; i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval, (socklen_t *)optlen); } else { i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen); } return i; } /* * do_set3 - pass ipfw control cmd to kernel * @optname: option name * @optval: pointer to option data * @optlen: option length * * Assumes op3 header is already embedded. * Calls setsockopt() with IP_FW3 as kernel-visible opcode. * Returns 0 on success or errno otherwise. */ int do_set3(int optname, ip_fw3_opheader *op3, uintptr_t optlen) { int errno; if (co.test_only) return (0); if (ipfw_socket == -1) ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (ipfw_socket < 0) err(EX_UNAVAILABLE, "socket"); op3->opcode = optname; if (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen) != 0) return (errno); return (0); } int do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen) { int error; if (co.test_only) return (0); if (ipfw_socket == -1) ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (ipfw_socket < 0) err(EX_UNAVAILABLE, "socket"); op3->opcode = optname; error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, (socklen_t *)optlen); if (error == -1) { if (errno != 0) error = errno; } return (error); } /* * do_setcmd3 - pass ipfw control cmd to kernel * @optname: option name * @optval: pointer to option data * @optlen: option length * * Function encapsulates option value in IP_FW3 socket option * and calls setsockopt(). * Function returns 0 on success or -1 otherwise. */ static int do_setcmd3(int optname, void *optval, socklen_t optlen) { socklen_t len; ip_fw3_opheader *op3; if (co.test_only) return (0); if (ipfw_socket == -1) ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (ipfw_socket < 0) err(EX_UNAVAILABLE, "socket"); len = sizeof(ip_fw3_opheader) + optlen; op3 = alloca(len); /* Zero reserved fields */ memset(op3, 0, sizeof(ip_fw3_opheader)); memcpy(op3 + 1, optval, optlen); op3->opcode = optname; return setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, len); } /** * match_token takes a table and a string, returns the value associated * with the string (-1 in case of failure). */ 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_token takes a table and a string, returns the value associated * with the string for the best match. * * Returns: * value from @table for matched records * -1 for non-matched records * -2 if more than one records match @string. */ int match_token_relaxed(struct _s_x *table, char *string) { struct _s_x *pt, *m; int i, c; i = strlen(string); c = 0; for (pt = table ; i != 0 && pt->s != NULL ; pt++) { if (strncmp(pt->s, string, i) != 0) continue; m = pt; c++; } if (c == 1) return (m->x); return (c > 0 ? -2: -1); } /** * match_value takes a table and a value, returns the string associated * with the value (NULL in case of failure). */ char const * match_value(struct _s_x *p, int value) { for (; p->s != NULL; p++) if (p->x == value) return p->s; return NULL; } size_t concat_tokens(char *buf, size_t bufsize, struct _s_x *table, char *delimiter) { struct _s_x *pt; int l; size_t sz; for (sz = 0, pt = table ; pt->s != NULL; pt++) { l = snprintf(buf + sz, bufsize - sz, "%s%s", (sz == 0) ? "" : delimiter, pt->s); sz += l; bufsize += l; if (sz > bufsize) return (bufsize); } return (sz); } /* * helper function to process a set of flags and set bits in the * appropriate masks. */ void fill_flags(struct _s_x *flags, char *p, uint8_t *set, uint8_t *clear) { char *q; /* points to the separator */ int val; uint8_t *which; /* mask we are working on */ while (p && *p) { 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; } } void print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint8_t set) { char const *comma = ""; int i, l; for (i = 0; list[i].x != 0; i++) { if ((set & list[i].x) == 0) continue; set &= ~list[i].x; l = snprintf(buf, sz, "%s%s", comma, list[i].s); if (l >= sz) return; comma = ","; buf += l; sz -=l; } } /* * _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. */ 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 bizarre construction * strncmp(str, "by", 2) which is used to allow people to use a shortcut * 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. */ 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(struct buf_pr *bp, int proto, uint16_t port) { if (proto == IPPROTO_ETHERTYPE) { char const *s; if (co.do_resolv && (s = match_value(ether_types, port)) ) bprintf(bp, "%s", s); else bprintf(bp, "0x%04x", port); } else { struct servent *se = NULL; if (co.do_resolv) { struct protoent *pe = getprotobynumber(proto); se = getservbyport(htons(port), pe ? pe->p_name : NULL); } if (se) bprintf(bp, "%s", se->s_name); else bprintf(bp, "%d", port); } } static 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}, {"tcpwin", O_TCPWIN}, {"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(struct buf_pr *bp, ipfw_insn_u16 *cmd, int proto, int opcode) { uint16_t *p = cmd->ports; int i; char const *sep; if (opcode != 0) { sep = match_value(_port_name, opcode); if (sep == NULL) sep = "???"; bprintf(bp, " %s", sep); } sep = " "; for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { bprintf(bp, "%s", sep); print_port(bp, proto, p[0]); if (p[0] != p[1]) { bprintf(bp, "-"); print_port(bp, 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 = safe_calloc(s1 - s + 1, 1); /* * 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 */ } /* * Fill the body of the command with the list of port ranges. */ static int fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen) { 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); CHECK_LENGTH(cblen, i + 2); 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); } /* * Fill the body of the command with the list of DiffServ codepoints. */ static void fill_dscp(ipfw_insn *cmd, char *av, int cblen) { uint32_t *low, *high; char *s = av, *a; int code; cmd->opcode = O_DSCP; cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1; CHECK_CMDLEN; low = (uint32_t *)(cmd + 1); high = low + 1; *low = 0; *high = 0; while (s != NULL) { a = strchr(s, ','); if (a != NULL) *a++ = '\0'; if (isalpha(*s)) { if ((code = match_token(f_ipdscp, s)) == -1) errx(EX_DATAERR, "Unknown DSCP code"); } else { code = strtoul(s, NULL, 10); if (code < 0 || code > 63) errx(EX_DATAERR, "Invalid DSCP value"); } if (code > 32) *high |= 1 << (code - 32); else *low |= 1 << code; s = a; } } 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(struct buf_pr *bp, uint16_t code) { char const *s; if ((s = match_value(icmpcodes, code)) != NULL) bprintf(bp, "unreach %s", s); else bprintf(bp, "unreach %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. */ 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) { bprintf(bp, " setup"); return; } bprintf(bp, " %s ", name); for (i=0; list[i].x != 0; i++) { if (set & list[i].x) { set &= ~list[i].x; bprintf(bp, "%s%s", comma, list[i].s); comma = ","; } if (clear & list[i].x) { clear &= ~list[i].x; bprintf(bp, "%s!%s", comma, list[i].s); comma = ","; } } } /* * Print the ip address contained in a command. */ static void print_ip(struct buf_pr *bp, struct format_opts *fo, ipfw_insn_ip *cmd, char const *s) { struct hostent *he = NULL; struct in_addr *ia; uint32_t len = F_LEN((ipfw_insn *)cmd); uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; char *t; if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) { uint32_t d = a[1]; const char *arg = ""; if (d < sizeof(lookup_key)/sizeof(lookup_key[0])) arg = match_value(rule_options, lookup_key[d]); t = table_search_ctlv(fo->tstate, ((ipfw_insn *)cmd)->arg1); bprintf(bp, "%s lookup %s %s", cmd->o.len & F_NOT ? " not": "", arg, t); return; } bprintf(bp, "%s%s ", cmd->o.len & F_NOT ? " not": "", s); if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { bprintf(bp, "me"); return; } if (cmd->o.opcode == O_IP_SRC_LOOKUP || cmd->o.opcode == O_IP_DST_LOOKUP) { t = table_search_ctlv(fo->tstate, ((ipfw_insn *)cmd)->arg1); bprintf(bp, "table(%s", t); if (len == F_INSN_SIZE(ipfw_insn_u32)) bprintf(bp, ",%u", *a); bprintf(bp, ")"); 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); bprintf(bp, "%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; bprintf(bp, "%c%d", comma, i+x); if (j>i+2) { /* range has at least 3 elements */ bprintf(bp, "-%d", j-1+x); i = j-1; } comma = ','; } bprintf(bp, "}"); 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 && co.do_resolv) he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); if (he != NULL) /* resolved to name */ bprintf(bp, "%s", he->h_name); else if (mb == 0) /* any */ bprintf(bp, "any"); else { /* numeric IP followed by some kind of mask */ ia = (struct in_addr *)&a[0]; bprintf(bp, "%s", inet_ntoa(*ia)); if (mb < 0) bprintf(bp, ":%s", inet_ntoa(*ia ) ); else if (mb < 32) bprintf(bp, "/%d", mb); } if (len > 1) bprintf(bp, ","); } } /* * prints a MAC address/mask pair */ static void print_mac(struct buf_pr *bp, uint8_t *addr, uint8_t *mask) { int l = contigmask(mask, 48); if (l == 0) bprintf(bp, " any"); else { bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); if (l == -1) bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x", mask[0], mask[1], mask[2], mask[3], mask[4], mask[5]); else if (l < 48) bprintf(bp, "/%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(struct buf_pr *bp, ipfw_insn_u32 *cmd) { int i; char sep= ' '; bprintf(bp, " icmptypes"); for (i = 0; i < 32; i++) { if ( (cmd->d[0] & (1 << (i))) == 0) continue; bprintf(bp, "%c%d", sep, i); sep = ','; } } static void print_dscp(struct buf_pr *bp, ipfw_insn_u32 *cmd) { int i, c; uint32_t *v; char sep= ' '; const char *code; bprintf(bp, " dscp"); i = 0; c = 0; v = cmd->d; while (i < 64) { if (*v & (1 << i)) { if ((code = match_value(f_ipdscp, i)) != NULL) bprintf(bp, "%c%s", sep, code); else bprintf(bp, "%c%d", sep, i); sep = ','; } if ((++i % 32) == 0) v++; } } /* * 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_PROTO4 0x0008 #define HAVE_PROTO6 0x0010 #define HAVE_IP 0x0100 #define HAVE_OPTIONS 0x8000 static void show_prerequisites(struct buf_pr *bp, int *flags, int want, int cmd) { (void)cmd; /* UNUSED */ if (co.comment_only) return; if ( (*flags & HAVE_IP) == HAVE_IP) *flags |= HAVE_OPTIONS; if ( !(*flags & HAVE_OPTIONS)) { if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) { if ( (*flags & HAVE_PROTO4)) bprintf(bp, " ip4"); else if ( (*flags & HAVE_PROTO6)) bprintf(bp, " ip6"); else bprintf(bp, " ip"); } if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) bprintf(bp, " from any"); if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) bprintf(bp, " to any"); } *flags |= want; } static void show_static_rule(struct cmdline_opts *co, struct format_opts *fo, struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr) { static int twidth = 0; int l; ipfw_insn *cmd, *tagptr = NULL; const 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 uval; if ((fo->set_mask & (1 << rule->set)) == 0) { /* disabled mask */ if (!co->show_sets) return; else bprintf(bp, "# DISABLED "); } bprintf(bp, "%05u ", rule->rulenum); /* Print counters if enabled */ if (fo->pcwidth > 0 || fo->bcwidth > 0) { pr_u64(bp, &cntr->pcnt, fo->pcwidth); pr_u64(bp, &cntr->bcnt, fo->bcwidth); } if (co->do_time == 2) bprintf(bp, "%10u ", cntr->timestamp); else if (co->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 (cntr->timestamp > 0) { t = _long_to_time(cntr->timestamp); strcpy(timestr, ctime(&t)); *strchr(timestr, '\n') = '\0'; bprintf(bp, "%s ", timestr); } else { bprintf(bp, "%*s", twidth, " "); } } if (co->show_sets) bprintf(bp, "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); bprintf(bp, "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: bprintf(bp, "check-state"); /* avoid printing anything else */ flags = HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP | HAVE_IP; break; case O_ACCEPT: bprintf(bp, "allow"); break; case O_COUNT: bprintf(bp, "count"); break; case O_DENY: bprintf(bp, "deny"); break; case O_REJECT: if (cmd->arg1 == ICMP_REJECT_RST) bprintf(bp, "reset"); else if (cmd->arg1 == ICMP_UNREACH_HOST) bprintf(bp, "reject"); else print_reject_code(bp, cmd->arg1); break; case O_UNREACH6: if (cmd->arg1 == ICMP6_UNREACH_RST) bprintf(bp, "reset6"); else print_unreach6_code(cmd->arg1); break; case O_SKIPTO: bprint_uint_arg(bp, "skipto ", cmd->arg1); break; case O_PIPE: bprint_uint_arg(bp, "pipe ", cmd->arg1); break; case O_QUEUE: bprint_uint_arg(bp, "queue ", cmd->arg1); break; case O_DIVERT: bprint_uint_arg(bp, "divert ", cmd->arg1); break; case O_TEE: bprint_uint_arg(bp, "tee ", cmd->arg1); break; case O_NETGRAPH: bprint_uint_arg(bp, "netgraph ", cmd->arg1); break; case O_NGTEE: bprint_uint_arg(bp, "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) { bprintf(bp, "fwd tablearg"); } else { bprintf(bp, "fwd %s",inet_ntoa(s->sa.sin_addr)); } if (s->sa.sin_port) bprintf(bp, ",%d", s->sa.sin_port); } break; case O_FORWARD_IP6: { char buf[4 + INET6_ADDRSTRLEN + 1]; ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd; bprintf(bp, "fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr, buf, sizeof(buf))); if (s->sa.sin6_port) bprintf(bp, ",%d", s->sa.sin6_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: if (cmd->arg1 != 0) bprint_uint_arg(bp, "nat ", cmd->arg1); else bprintf(bp, "nat global"); break; case O_SETFIB: bprint_uint_arg(bp, "setfib ", cmd->arg1 & 0x7FFF); break; case O_SETDSCP: { const char *code; if (cmd->arg1 == IP_FW_TARG) { bprint_uint_arg(bp, "setdscp ", cmd->arg1); break; } uval = cmd->arg1 & 0x3F; if ((code = match_value(f_ipdscp, uval)) != NULL) bprintf(bp, "setdscp %s", code); else bprint_uint_arg(bp, "setdscp ", uval); } break; case O_REASS: bprintf(bp, "reass"); break; case O_CALLRETURN: if (cmd->len & F_NOT) bprintf(bp, "return"); else bprint_uint_arg(bp, "call ", cmd->arg1); break; default: bprintf(bp, "** unrecognized action %d len %d ", cmd->opcode, cmd->len); } } if (logptr) { if (logptr->max_log > 0) bprintf(bp, " log logamount %d", logptr->max_log); else bprintf(bp, " log"); } #ifndef NO_ALTQ if (altqptr) { print_altq_cmd(bp, altqptr); } #endif if (tagptr) { if (tagptr->len & F_NOT) bprint_uint_arg(bp, " untag ", tagptr->arg1); else bprint_uint_arg(bp, " 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->flags & IPFW_RULE_NOOPT) { /* empty rules before options */ if (!co->do_compact) { show_prerequisites(bp, &flags, HAVE_PROTO, 0); bprintf(bp, " from any to any"); } flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP; } if (co->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 (co->comment_only) { if (cmd->opcode != O_NOP) continue; bprintf(bp, " // %s\n", (char *)(cmd + 1)); return; } show_prerequisites(bp, &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_IP_SRC: case O_IP_SRC_LOOKUP: case O_IP_SRC_MASK: case O_IP_SRC_ME: case O_IP_SRC_SET: show_prerequisites(bp, &flags, HAVE_PROTO, 0); if (!(flags & HAVE_SRCIP)) bprintf(bp, " from"); if ((cmd->len & F_OR) && !or_block) bprintf(bp, " {"); print_ip(bp, fo, (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(bp, &flags, HAVE_PROTO|HAVE_SRCIP, 0); if (!(flags & HAVE_DSTIP)) bprintf(bp, " to"); if ((cmd->len & F_OR) && !or_block) bprintf(bp, " {"); print_ip(bp, fo, (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(bp, &flags, HAVE_PROTO, 0); if (!(flags & HAVE_SRCIP)) bprintf(bp, " from"); if ((cmd->len & F_OR) && !or_block) bprintf(bp, " {"); print_ip6(bp, (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(bp, &flags, HAVE_PROTO|HAVE_SRCIP, 0); if (!(flags & HAVE_DSTIP)) bprintf(bp, " to"); if ((cmd->len & F_OR) && !or_block) bprintf(bp, " {"); print_ip6(bp, (ipfw_insn_ip6 *)cmd, (flags & HAVE_OPTIONS) ? " dst-ip6" : ""); flags |= HAVE_DSTIP; break; case O_FLOW6ID: print_flow6id(bp, (ipfw_insn_u32 *) cmd ); flags |= HAVE_OPTIONS; break; case O_IP_DSTPORT: show_prerequisites(bp, &flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP | HAVE_IP, 0); case O_IP_SRCPORT: if (flags & HAVE_DSTIP) flags |= HAVE_IP; show_prerequisites(bp, &flags, HAVE_PROTO | HAVE_SRCIP, 0); if ((cmd->len & F_OR) && !or_block) bprintf(bp, " {"); if (cmd->len & F_NOT) bprintf(bp, " not"); print_newports(bp, (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) bprintf(bp, " {"); if (cmd->len & F_NOT) bprintf(bp, " not"); proto = cmd->arg1; pe = getprotobynumber(cmd->arg1); if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) && !(flags & HAVE_PROTO)) show_prerequisites(bp, &flags, HAVE_PROTO | HAVE_IP | HAVE_SRCIP | HAVE_DSTIP | HAVE_OPTIONS, 0); if (flags & HAVE_OPTIONS) bprintf(bp, " proto"); if (pe) bprintf(bp, " %s", pe->p_name); else bprintf(bp, " %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(bp, &flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0); if ((cmd->len & F_OR) && !or_block) bprintf(bp, " {"); if (cmd->len & F_NOT && cmd->opcode != O_IN) bprintf(bp, " not"); switch(cmd->opcode) { case O_MACADDR2: { ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; bprintf(bp, " MAC"); print_mac(bp, m->addr, m->mask); print_mac(bp, m->addr + 6, m->mask + 6); } break; case O_MAC_TYPE: print_newports(bp, (ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, cmd->opcode); break; case O_FRAG: bprintf(bp, " frag"); break; case O_FIB: bprintf(bp, " fib %u", cmd->arg1 ); break; case O_SOCKARG: bprintf(bp, " sockarg"); break; case O_IN: bprintf(bp, cmd->len & F_NOT ? " out" : " in"); break; case O_DIVERTED: switch (cmd->arg1) { case 3: bprintf(bp, " diverted"); break; case 1: bprintf(bp, " diverted-loopback"); break; case 2: bprintf(bp, " diverted-output"); break; default: bprintf(bp, " diverted-?<%u>", cmd->arg1); break; } break; case O_LAYER2: bprintf(bp, " layer2"); break; case O_XMIT: case O_RECV: case O_VIA: { char const *s, *t; 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') bprintf(bp, " %s %s", s, inet_ntoa(cmdif->p.ip)); else if (cmdif->name[0] == '\1') { /* interface table */ t = table_search_ctlv(fo->tstate, cmdif->p.kidx); bprintf(bp, " %s table(%s)", s, t); } else bprintf(bp, " %s %s", s, cmdif->name); break; } case O_IP_FLOW_LOOKUP: { char *t; t = table_search_ctlv(fo->tstate, cmd->arg1); bprintf(bp, " flow table(%s", t); if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) bprintf(bp, ",%u", ((ipfw_insn_u32 *)cmd)->d[0]); bprintf(bp, ")"); break; } case O_IPID: if (F_LEN(cmd) == 1) bprintf(bp, " ipid %u", cmd->arg1 ); else print_newports(bp, (ipfw_insn_u16 *)cmd, 0, O_IPID); break; case O_IPTTL: if (F_LEN(cmd) == 1) bprintf(bp, " ipttl %u", cmd->arg1 ); else print_newports(bp, (ipfw_insn_u16 *)cmd, 0, O_IPTTL); break; case O_IPVER: bprintf(bp, " ipver %u", cmd->arg1 ); break; case O_IPPRECEDENCE: bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5); break; case O_DSCP: print_dscp(bp, (ipfw_insn_u32 *)cmd); break; case O_IPLEN: if (F_LEN(cmd) == 1) bprintf(bp, " iplen %u", cmd->arg1 ); else print_newports(bp, (ipfw_insn_u16 *)cmd, 0, O_IPLEN); break; case O_IPOPT: print_flags(bp, "ipoptions", cmd, f_ipopts); break; case O_IPTOS: print_flags(bp, "iptos", cmd, f_iptos); break; case O_ICMPTYPE: print_icmptypes(bp, (ipfw_insn_u32 *)cmd); break; case O_ESTAB: bprintf(bp, " established"); break; case O_TCPDATALEN: if (F_LEN(cmd) == 1) bprintf(bp, " tcpdatalen %u", cmd->arg1 ); else print_newports(bp, (ipfw_insn_u16 *)cmd, 0, O_TCPDATALEN); break; case O_TCPFLAGS: print_flags(bp, "tcpflags", cmd, f_tcpflags); break; case O_TCPOPTS: print_flags(bp, "tcpoptions", cmd, f_tcpopts); break; case O_TCPWIN: if (F_LEN(cmd) == 1) bprintf(bp, " tcpwin %u", cmd->arg1); else print_newports(bp, (ipfw_insn_u16 *)cmd, 0, O_TCPWIN); break; case O_TCPACK: bprintf(bp, " tcpack %d", ntohl(cmd32->d[0])); break; case O_TCPSEQ: bprintf(bp, " tcpseq %d", ntohl(cmd32->d[0])); break; case O_UID: { struct passwd *pwd = getpwuid(cmd32->d[0]); if (pwd) bprintf(bp, " uid %s", pwd->pw_name); else bprintf(bp, " uid %u", cmd32->d[0]); } break; case O_GID: { struct group *grp = getgrgid(cmd32->d[0]); if (grp) bprintf(bp, " gid %s", grp->gr_name); else bprintf(bp, " gid %u", cmd32->d[0]); } break; case O_JAIL: bprintf(bp, " jail %d", cmd32->d[0]); break; case O_VERREVPATH: bprintf(bp, " verrevpath"); break; case O_VERSRCREACH: bprintf(bp, " versrcreach"); break; case O_ANTISPOOF: bprintf(bp, " antispoof"); break; case O_IPSEC: bprintf(bp, " ipsec"); break; case O_NOP: comment = (char *)(cmd + 1); break; case O_KEEP_STATE: bprintf(bp, " 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 = " "; bprintf(bp, " limit"); for (; p->x != 0 ; p++) if ((x & p->x) == p->x) { x &= ~p->x; bprintf(bp, "%s%s", comma,p->s); comma = ","; } bprint_uint_arg(bp, " ", c->conn_limit); break; } case O_IP6: bprintf(bp, " ip6"); break; case O_IP4: bprintf(bp, " ip4"); break; case O_ICMP6TYPE: print_icmp6types(bp, (ipfw_insn_u32 *)cmd); break; case O_EXT_HDR: print_ext6hdr(bp, (ipfw_insn *)cmd); break; case O_TAGGED: if (F_LEN(cmd) == 1) bprint_uint_arg(bp, " tagged ", cmd->arg1); else print_newports(bp, (ipfw_insn_u16 *)cmd, 0, O_TAGGED); break; default: bprintf(bp, " [opcode %d len %d]", cmd->opcode, cmd->len); } } if (cmd->len & F_OR) { bprintf(bp, " or"); or_block = 1; } else if (or_block) { bprintf(bp, " }"); or_block = 0; } } show_prerequisites(bp, &flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP | HAVE_IP, 0); if (comment) bprintf(bp, " // %s", comment); bprintf(bp, "\n"); } static void show_dyn_state(struct cmdline_opts *co, struct format_opts *fo, struct buf_pr *bp, ipfw_dyn_rule *d) { struct protoent *pe; struct in_addr a; uint16_t rulenum; char buf[INET6_ADDRSTRLEN]; if (!co->do_expired) { if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) return; } bcopy(&d->rule, &rulenum, sizeof(rulenum)); bprintf(bp, "%05d", rulenum); if (fo->pcwidth > 0 || fo->bcwidth > 0) { bprintf(bp, " "); pr_u64(bp, &d->pcnt, fo->pcwidth); pr_u64(bp, &d->bcnt, fo->bcwidth); bprintf(bp, "(%ds)", d->expire); } switch (d->dyn_type) { case O_LIMIT_PARENT: bprintf(bp, " PARENT %d", d->count); break; case O_LIMIT: bprintf(bp, " LIMIT"); break; case O_KEEP_STATE: /* bidir, no mask */ bprintf(bp, " STATE"); break; } if ((pe = getprotobynumber(d->id.proto)) != NULL) bprintf(bp, " %s", pe->p_name); else bprintf(bp, " proto %u", d->id.proto); if (d->id.addr_type == 4) { a.s_addr = htonl(d->id.src_ip); bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port); a.s_addr = htonl(d->id.dst_ip); bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port); } else if (d->id.addr_type == 6) { bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf, sizeof(buf)), d->id.src_port); bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf, sizeof(buf)), d->id.dst_port); } else bprintf(bp, " UNKNOWN <-> UNKNOWN\n"); } static int do_range_cmd(int cmd, ipfw_range_tlv *rt) { ipfw_range_header rh; memset(&rh, 0, sizeof(rh)); memcpy(&rh.range, rt, sizeof(*rt)); rh.range.head.length = sizeof(*rt); rh.range.head.type = IPFW_TLV_RANGE; return (do_set3(cmd, &rh.opheader, sizeof(rh))); } /* * 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 */ void ipfw_sets_handler(char *av[]) { uint32_t masks[2]; int i; uint8_t cmd, new_set, rulenum; ipfw_range_tlv rt; char *msg; size_t size; av++; memset(&rt, 0, sizeof(rt)); if (av[0] == NULL) errx(EX_USAGE, "set needs command"); if (_substrcmp(*av, "show") == 0) { struct format_opts fo; ipfw_cfg_lheader *cfg; memset(&fo, 0, sizeof(fo)); if (ipfw_get_config(&co, &fo, &cfg, &size) != 0) err(EX_OSERR, "requesting config failed"); for (i = 0, msg = "disable"; i < RESVD_SET; i++) if ((cfg->set_mask & (1<set_mask != (uint32_t)-1) ? " enable" : "enable"; for (i = 0; i < RESVD_SET; i++) if ((cfg->set_mask & (1< RESVD_SET) errx(EX_DATAERR, "invalid set number %s\n", av[0]); if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET) errx(EX_DATAERR, "invalid set number %s\n", av[1]); i = do_range_cmd(IP_FW_SET_SWAP, &rt); } else if (_substrcmp(*av, "move") == 0) { av++; if (av[0] && _substrcmp(*av, "rule") == 0) { rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */ cmd = IP_FW_XMOVE; av++; } else cmd = IP_FW_SET_MOVE; /* Move set to new one */ if (av[0] == NULL || av[1] == NULL || av[2] == NULL || av[3] != NULL || _substrcmp(av[1], "to") != 0) errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); rulenum = atoi(av[0]); rt.new_set = atoi(av[2]); if (cmd == IP_FW_XMOVE) { rt.start_rule = rulenum; rt.end_rule = rulenum; } else rt.set = rulenum; rt.new_set = atoi(av[2]); if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) || (cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) ) 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]); i = do_range_cmd(cmd, &rt); } else if (_substrcmp(*av, "disable") == 0 || _substrcmp(*av, "enable") == 0 ) { int which = _substrcmp(*av, "enable") == 0 ? 1 : 0; av++; masks[0] = masks[1] = 0; while (av[0]) { if (isdigit(**av)) { i = atoi(*av); if (i < 0 || i > RESVD_SET) errx(EX_DATAERR, "invalid set number %d\n", i); masks[which] |= (1<dcnt++; if (fo->show_counters == 0) return; if (co->use_set) { /* skip states from another set */ bcopy((char *)&d->rule + sizeof(uint16_t), &set, sizeof(uint8_t)); if (set != co->use_set - 1) return; } width = pr_u64(NULL, &d->pcnt, 0); if (width > fo->pcwidth) fo->pcwidth = width; width = pr_u64(NULL, &d->bcnt, 0); if (width > fo->bcwidth) fo->bcwidth = width; } static int foreach_state(struct cmdline_opts *co, struct format_opts *fo, caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg) { int ttype; state_cb *fptr; void *farg; ipfw_obj_tlv *tlv; ipfw_obj_ctlv *ctlv; fptr = NULL; ttype = 0; while (sz > 0) { ctlv = (ipfw_obj_ctlv *)base; switch (ctlv->head.type) { case IPFW_TLV_DYNSTATE_LIST: base += sizeof(*ctlv); sz -= sizeof(*ctlv); ttype = IPFW_TLV_DYN_ENT; fptr = dyn_bc; farg = dyn_arg; break; default: return (sz); } while (sz > 0) { tlv = (ipfw_obj_tlv *)base; if (tlv->type != ttype) break; fptr(co, fo, farg, tlv + 1); sz -= tlv->length; base += tlv->length; } } return (sz); } static void prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo, ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz) { int bcwidth, pcwidth, width; int n; struct ip_fw_bcounter *cntr; struct ip_fw_rule *r; bcwidth = 0; pcwidth = 0; if (fo->show_counters != 0) { for (n = 0; n < rcnt; n++, rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { cntr = (struct ip_fw_bcounter *)(rtlv + 1); r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); /* skip rules from another set */ if (co->use_set && r->set != co->use_set - 1) continue; /* packet counter */ width = pr_u64(NULL, &cntr->pcnt, 0); if (width > pcwidth) pcwidth = width; /* byte counter */ width = pr_u64(NULL, &cntr->bcnt, 0); if (width > bcwidth) bcwidth = width; } } fo->bcwidth = bcwidth; fo->pcwidth = pcwidth; fo->dcnt = 0; if (co->do_dynamic && dynsz > 0) foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL); } static int list_static_range(struct cmdline_opts *co, struct format_opts *fo, struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt) { int n, seen; struct ip_fw_rule *r; struct ip_fw_bcounter *cntr; int c = 0; for (n = seen = 0; n < rcnt; n++, rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) { if (fo->show_counters != 0) { cntr = (struct ip_fw_bcounter *)(rtlv + 1); r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size); } else { cntr = NULL; r = (struct ip_fw_rule *)(rtlv + 1); } if (r->rulenum > fo->last) break; if (co->use_set && r->set != co->use_set - 1) continue; if (r->rulenum >= fo->first && r->rulenum <= fo->last) { show_static_rule(co, fo, bp, r, cntr); printf("%s", bp->buf); c += rtlv->length; bp_flush(bp); seen++; } } return (seen); } static void list_dyn_state(struct cmdline_opts *co, struct format_opts *fo, void *_arg, void *_state) { uint16_t rulenum; uint8_t set; ipfw_dyn_rule *d; struct buf_pr *bp; d = (ipfw_dyn_rule *)_state; bp = (struct buf_pr *)_arg; bcopy(&d->rule, &rulenum, sizeof(rulenum)); if (rulenum > fo->last) return; if (co->use_set) { bcopy((char *)&d->rule + sizeof(uint16_t), &set, sizeof(uint8_t)); if (set != co->use_set - 1) return; } if (rulenum >= fo->first) { show_dyn_state(co, fo, bp, d); printf("%s\n", bp->buf); bp_flush(bp); } } static int list_dyn_range(struct cmdline_opts *co, struct format_opts *fo, struct buf_pr *bp, caddr_t base, size_t sz) { sz = foreach_state(co, fo, base, sz, list_dyn_state, bp); return (sz); } void ipfw_list(int ac, char *av[], int show_counters) { ipfw_cfg_lheader *cfg; struct format_opts sfo; size_t sz; int error; int lac; char **lav; uint32_t rnum; char *endptr; if (co.test_only) { fprintf(stderr, "Testing only, list disabled\n"); return; } if (co.do_pipe) { dummynet_list(ac, av, show_counters); return; } ac--; av++; memset(&sfo, 0, sizeof(sfo)); /* Determine rule range to request */ if (ac > 0) { for (lac = ac, lav = av; lac != 0; lac--) { rnum = strtoul(*lav++, &endptr, 10); if (sfo.first == 0 || rnum < sfo.first) sfo.first = rnum; if (*endptr == '-') rnum = strtoul(endptr + 1, &endptr, 10); if (sfo.last == 0 || rnum > sfo.last) sfo.last = rnum; } } /* get configuraion from kernel */ cfg = NULL; sfo.show_counters = show_counters; sfo.flags = IPFW_CFG_GET_STATIC; if (co.do_dynamic != 0) sfo.flags |= IPFW_CFG_GET_STATES; if (sfo.show_counters != 0) sfo.flags |= IPFW_CFG_GET_COUNTERS; if ((error = ipfw_get_config(&co, &sfo, &cfg, &sz)) != 0) err(EX_OSERR, "retrieving config failed"); error = ipfw_show_config(&co, &sfo, cfg, sz, ac, av); free(cfg); if (error != EX_OK) exit(error); } static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo, ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[]) { caddr_t dynbase; size_t dynsz; int rcnt; int exitval = EX_OK; int lac; char **lav; char *endptr; size_t read; struct buf_pr bp; ipfw_obj_ctlv *ctlv, *tstate; ipfw_obj_tlv *rbase; /* * Handle tablenames TLV first, if any */ tstate = NULL; rbase = NULL; dynbase = NULL; dynsz = 0; read = sizeof(*cfg); fo->set_mask = cfg->set_mask; ctlv = (ipfw_obj_ctlv *)(cfg + 1); if (cfg->flags & IPFW_CFG_GET_STATIC) { /* We've requested static rules */ if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) { fo->tstate = ctlv; read += ctlv->head.length; ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); } if (ctlv->head.type == IPFW_TLV_RULE_LIST) { rbase = (ipfw_obj_tlv *)(ctlv + 1); rcnt = ctlv->count; read += ctlv->head.length; ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); } } if ((cfg->flags & IPFW_CFG_GET_STATES) && (read != sz)) { /* We may have some dynamic states */ dynsz = sz - read; /* Skip empty header */ if (dynsz != sizeof(ipfw_obj_ctlv)) dynbase = (caddr_t)ctlv; else dynsz = 0; } prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz); bp_alloc(&bp, 4096); /* if no rule numbers were specified, list all rules */ if (ac == 0) { fo->first = 0; fo->last = IPFW_DEFAULT_RULE; list_static_range(co, fo, &bp, rbase, rcnt); if (co->do_dynamic && dynsz > 0) { printf("## Dynamic rules (%d %lu):\n", fo->dcnt, dynsz); list_dyn_range(co, fo, &bp, dynbase, dynsz); } bp_free(&bp); return (EX_OK); } /* display specific rules requested on command line */ for (lac = ac, lav = av; lac != 0; lac--) { /* convert command line rule # */ fo->last = fo->first = strtoul(*lav++, &endptr, 10); if (*endptr == '-') fo->last = strtoul(endptr + 1, &endptr, 10); if (*endptr) { exitval = EX_USAGE; warnx("invalid rule number: %s", *(lav - 1)); continue; } if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) { /* give precedence to other error(s) */ if (exitval == EX_OK) exitval = EX_UNAVAILABLE; if (fo->first == fo->last) warnx("rule %u does not exist", fo->first); else warnx("no rules in range %u-%u", fo->first, fo->last); } } if (co->do_dynamic && dynsz > 0) { printf("## Dynamic rules:\n"); for (lac = ac, lav = av; lac != 0; lac--) { fo->last = fo->first = strtoul(*lav++, &endptr, 10); if (*endptr == '-') fo->last = strtoul(endptr+1, &endptr, 10); if (*endptr) /* already warned */ continue; list_dyn_range(co, fo, &bp, dynbase, dynsz); } } bp_free(&bp); return (exitval); } /* * Retrieves current ipfw configuration of given type * and stores its pointer to @pcfg. * * Caller is responsible for freeing @pcfg. * * Returns 0 on success. */ static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo, ipfw_cfg_lheader **pcfg, size_t *psize) { ipfw_cfg_lheader *cfg; size_t sz; int error, i; if (co->test_only != 0) { fprintf(stderr, "Testing only, list disabled\n"); return (0); } /* Start with some data size */ sz = 4096; cfg = NULL; for (i = 0; i < 16; i++) { if (cfg != NULL) free(cfg); if ((cfg = calloc(1, sz)) == NULL) return (ENOMEM); cfg->flags = fo->flags; cfg->start_rule = fo->first; cfg->end_rule = fo->last; if ((error = do_get3(IP_FW_XGET, &cfg->opheader, &sz)) != 0) { if (error != ENOMEM) { free(cfg); return (error); } /* Buffer size is not enough. Try to increase */ sz = sz * 2; if (sz < cfg->size) sz = cfg->size; continue; } *pcfg = cfg; *psize = sz; return (0); } free(cfg); return (ENOMEM); } 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); } struct tidx { ipfw_obj_ntlv *idx; uint32_t count; uint32_t size; uint16_t counter; }; static uint16_t pack_table(struct tidx *tstate, char *name, uint32_t set) { int i; ipfw_obj_ntlv *ntlv; if (table_check_name(name) != 0) return (0); for (i = 0; i < tstate->count; i++) { if (strcmp(tstate->idx[i].name, name) != 0) continue; if (tstate->idx[i].set != set) continue; return (tstate->idx[i].idx); } if (tstate->count + 1 > tstate->size) { tstate->size += 4; tstate->idx = realloc(tstate->idx, tstate->size * sizeof(ipfw_obj_ntlv)); if (tstate->idx == NULL) return (0); } ntlv = &tstate->idx[i]; memset(ntlv, 0, sizeof(ipfw_obj_ntlv)); strlcpy(ntlv->name, name, sizeof(ntlv->name)); ntlv->head.type = IPFW_TLV_TBL_NAME; ntlv->head.length = sizeof(ipfw_obj_ntlv); ntlv->set = set; ntlv->idx = ++tstate->counter; tstate->count++; return (ntlv->idx); } static void fill_table(ipfw_insn *cmd, char *av, uint8_t opcode, struct tidx *tstate) { uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; uint16_t uidx; char *p; if ((p = strchr(av + 6, ')')) == NULL) errx(EX_DATAERR, "forgotten parenthesis: '%s'", av); *p = '\0'; p = strchr(av + 6, ','); if (p) *p++ = '\0'; if ((uidx = pack_table(tstate, av + 6, 0)) == 0) errx(EX_DATAERR, "Invalid table name: %s", av + 6); cmd->opcode = opcode; cmd->arg1 = uidx; if (p) { cmd->len |= F_INSN_SIZE(ipfw_insn_u32); d[0] = strtoul(p, NULL, 0); } else cmd->len |= F_INSN_SIZE(ipfw_insn); } /* * 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 cblen, struct tidx *tstate) { 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) { fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate); 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 = '\0'; CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len); 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] == (uint32_t)~0 && 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; } /* n2mask sets n bits of the mask */ 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; } static void fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, struct _s_x *flags, char *p) { uint8_t set = 0, clear = 0; fill_flags(flags, p, &set, &clear); cmd->opcode = opcode; cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); } void ipfw_delete(char *av[]) { uint32_t rulenum; int i; int exitval = EX_OK; int do_set = 0; ipfw_range_tlv rt; av++; NEED1("missing rule specification"); memset(&rt, 0, sizeof(rt)); if ( *av && _substrcmp(*av, "set") == 0) { /* Do not allow using the following syntax: * ipfw set N delete set M */ if (co.use_set) errx(EX_DATAERR, "invalid syntax"); do_set = 1; /* delete set */ av++; } /* Rule number */ while (*av && isdigit(**av)) { i = atoi(*av); av++; if (co.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 (co.do_pipe) { exitval = ipfw_delete_pipe(co.do_pipe, i); } else { if (do_set != 0) { rt.set = i & 31; rt.flags = IPFW_RCFLAG_SET; } else { rt.start_rule = i & 0xffff; rt.end_rule = i & 0xffff; if (rt.start_rule == 0 && rt.end_rule == 0) rt.flags |= IPFW_RCFLAG_ALL; else rt.flags |= IPFW_RCFLAG_RANGE; if (co.use_set != 0) { rt.set = co.use_set - 1; rt.flags |= IPFW_RCFLAG_SET; } } i = do_range_cmd(IP_FW_XDEL, &rt); if (i != 0) { exitval = EX_UNAVAILABLE; warn("rule %u: setsockopt(IP_FW_XDEL)", 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, int cblen, struct tidx *tstate) { char *p; uint16_t uidx; cmd->name[0] = '\0'; cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); CHECK_CMDLEN; /* Parse the interface or address */ if (strcmp(arg, "any") == 0) cmd->o.len = 0; /* effectively ignore this command */ else if (strncmp(arg, "table(", 6) == 0) { if ((p = strchr(arg + 6, ')')) == NULL) errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg); *p = '\0'; p = strchr(arg + 6, ','); if (p) *p++ = '\0'; if ((uidx = pack_table(tstate, arg + 6, 0)) == 0) errx(EX_DATAERR, "Invalid table name: %s", arg + 6); cmd->name[0] = '\1'; /* Special value indicating table */ cmd->p.kidx = uidx; } 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); } static void get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask) { int i; size_t l; char *ap, *ptr, *optr; struct ether_addr *mac; const char *macset = "0123456789abcdefABCDEF:"; if (strcmp(p, "any") == 0) { for (i = 0; i < ETHER_ADDR_LEN; i++) addr[i] = mask[i] = 0; return; } optr = ptr = strdup(p); if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) { l = strlen(ap); if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL) errx(EX_DATAERR, "Incorrect MAC address"); bcopy(mac, addr, ETHER_ADDR_LEN); } else errx(EX_DATAERR, "Incorrect MAC address"); if (ptr != NULL) { /* we have mask? */ if (p[ptr - optr - 1] == '/') { /* mask len */ long ml = strtol(ptr, &ap, 10); if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0) errx(EX_DATAERR, "Incorrect mask length"); for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++) mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml); } else { /* mask */ l = strlen(ptr); if (strspn(ptr, macset) != l || (mac = ether_aton(ptr)) == NULL) errx(EX_DATAERR, "Incorrect mask"); bcopy(mac, mask, ETHER_ADDR_LEN); } } else { /* default mask: ff:ff:ff:ff:ff:ff */ for (i = 0; i < ETHER_ADDR_LEN; i++) mask[i] = 0xff; } for (i = 0; i < ETHER_ADDR_LEN; i++) addr[i] &= mask[i]; free(optr); } /* * 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, int *len) { *len -= F_LEN(cmd); CHECK_LENGTH(*len, 0); 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, char **av, int cblen) { 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; av[i] != NULL; 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; CHECK_CMDLEN; for (i = 0; av[i] != NULL; 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, char *av[], int cblen) { ipfw_insn_mac *mac; if ( ( av[0] == NULL ) || ( av[1] == NULL ) ) errx(EX_DATAERR, "MAC dst src"); cmd->opcode = O_MACADDR2; cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); CHECK_CMDLEN; mac = (ipfw_insn_mac *)cmd; get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]), &(mac->mask[ETHER_ADDR_LEN])); /* src */ return cmd; } static ipfw_insn * add_mactype(ipfw_insn *cmd, char *av, int cblen) { if (!av) 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, cblen); 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, int cblen, struct tidx *tstate) { fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 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, int cblen, struct tidx *tstate) { fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate); 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, int cblen) { /* XXX "any" is trapped before. Perhaps "to" */ if (_substrcmp(av, "any") == 0) { return NULL; } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) { /* 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, int cblen, struct tidx *tstate) { struct in6_addr a; char *host, *ch, buf[INET6_ADDRSTRLEN]; ipfw_insn *ret = NULL; int len; /* Copy first address in set if needed */ if ((ch = strpbrk(av, "/,")) != NULL) { len = ch - av; strlcpy(buf, av, sizeof(buf)); if (len < sizeof(buf)) buf[len] = '\0'; host = buf; } else host = av; if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || inet_pton(AF_INET6, host, &a) == 1) ret = add_srcip6(cmd, av, cblen); /* XXX: should check for IPv4, not !IPv6 */ if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || inet_pton(AF_INET6, host, &a) != 1)) ret = add_srcip(cmd, av, cblen, tstate); if (ret == NULL && strcmp(av, "any") != 0) ret = cmd; return ret; } static ipfw_insn * add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate) { struct in6_addr a; char *host, *ch, buf[INET6_ADDRSTRLEN]; ipfw_insn *ret = NULL; int len; /* Copy first address in set if needed */ if ((ch = strpbrk(av, "/,")) != NULL) { len = ch - av; strlcpy(buf, av, sizeof(buf)); if (len < sizeof(buf)) buf[len] = '\0'; host = buf; } else host = av; if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 || inet_pton(AF_INET6, host, &a) == 1) ret = add_dstip6(cmd, av, cblen); /* XXX: should check for IPv4, not !IPv6 */ if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 || inet_pton(AF_INET6, host, &a) != 1)) ret = add_dstip(cmd, av, cblen, tstate); if (ret == NULL && strcmp(av, "any") != 0) ret = cmd; 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. * */ void compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate) { /* * 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 actbuf[255], cmdbuf[255]; int rblen, ablen, cblen; ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; ipfw_insn *first_cmd; /* first match pattern */ struct ip_fw_rule *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(rbuf, *rbufsize); rule = (struct ip_fw_rule *)rbuf; cmd = (ipfw_insn *)cmdbuf; action = (ipfw_insn *)actbuf; rblen = *rbufsize / sizeof(uint32_t); rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t); ablen = sizeof(actbuf) / sizeof(actbuf[0]); cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]); cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1; #define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; } #define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len) av++; /* [rule N] -- Rule number optional */ if (av[0] && isdigit(**av)) { rule->rulenum = atoi(*av); av++; } /* [set N] -- set number (0..RESVD_SET), optional */ if (av[0] && av[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; } /* [prob D] -- match probability, optional */ if (av[0] && av[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; } /* action -- mandatory */ NEED1("missing action"); i = match_token(rule_actions, *av); av++; action->len = 1; /* default */ CHECK_ACTLEN; 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); av++; break; case TOK_UNREACH6: action->opcode = O_UNREACH6; NEED1("missing unreach code"); fill_unreach6_code(&action->arg1, *av); av++; break; case TOK_COUNT: action->opcode = O_COUNT; break; case TOK_NAT: action->opcode = O_NAT; action->len = F_INSN_SIZE(ipfw_insn_nat); CHECK_ACTLEN; if (_substrcmp(*av, "global") == 0) { action->arg1 = 0; av++; break; } else goto chkarg; 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; goto chkarg; case TOK_CALL: action->opcode = O_CALLRETURN; chkarg: if (!av[0]) 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_TARG) errx(EX_DATAERR, "illegal argument for %s", *(av - 1)); } else if (_substrcmp(*av, "tablearg") == 0) { action->arg1 = IP_FW_TARG; } 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)); av++; break; case TOK_FORWARD: { /* * Locate the address-port separator (':' or ','). * Could be one of the following: * hostname:port * IPv4 a.b.c.d,port * IPv4 a.b.c.d:port * IPv6 w:x:y::z,port * The ':' can only be used with hostname and IPv4 address. * XXX-BZ Should we also support [w:x:y::z]:port? */ struct sockaddr_storage result; struct addrinfo *res; char *s, *end; int family; u_short port_number; NEED1("missing forward address[:port]"); /* * locate the address-port separator (':' or ',') */ s = strchr(*av, ','); if (s == NULL) { /* Distinguish between IPv4:port and IPv6 cases. */ s = strchr(*av, ':'); if (s && strchr(s+1, ':')) s = NULL; /* no port */ } port_number = 0; if (s != NULL) { /* Terminate host portion and set s to start of port. */ *(s++) = '\0'; i = strtoport(s, &end, 0 /* base */, 0 /* proto */); if (s == end) errx(EX_DATAERR, "illegal forwarding port ``%s''", s); port_number = (u_short)i; } if (_substrcmp(*av, "tablearg") == 0) { family = PF_INET; ((struct sockaddr_in*)&result)->sin_addr.s_addr = INADDR_ANY; } else { /* * Resolve the host name or address to a family and a * network representation of the address. */ if (getaddrinfo(*av, NULL, NULL, &res)) errx(EX_DATAERR, NULL); /* Just use the first host in the answer. */ family = res->ai_family; memcpy(&result, res->ai_addr, res->ai_addrlen); freeaddrinfo(res); } if (family == PF_INET) { ipfw_insn_sa *p = (ipfw_insn_sa *)action; action->opcode = O_FORWARD_IP; action->len = F_INSN_SIZE(ipfw_insn_sa); CHECK_ACTLEN; /* * In the kernel we assume AF_INET and use only * sin_port and sin_addr. Remember to set sin_len as * the routing code seems to use it too. */ p->sa.sin_len = sizeof(struct sockaddr_in); p->sa.sin_family = AF_INET; p->sa.sin_port = port_number; p->sa.sin_addr.s_addr = ((struct sockaddr_in *)&result)->sin_addr.s_addr; } else if (family == PF_INET6) { ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action; action->opcode = O_FORWARD_IP6; action->len = F_INSN_SIZE(ipfw_insn_sa6); CHECK_ACTLEN; p->sa.sin6_len = sizeof(struct sockaddr_in6); p->sa.sin6_family = AF_INET6; p->sa.sin6_port = port_number; p->sa.sin6_flowinfo = 0; p->sa.sin6_scope_id = 0; /* No table support for v6 yet. */ bcopy(&((struct sockaddr_in6*)&result)->sin6_addr, &p->sa.sin6_addr, sizeof(p->sa.sin6_addr)); } else { errx(EX_DATAERR, "Invalid address family in forward action"); } av++; break; } case TOK_COMMENT: /* pretend it is a 'count' rule followed by the comment */ action->opcode = O_COUNT; av--; /* go back... */ break; case TOK_SETFIB: { int numfibs; size_t intsize = sizeof(int); action->opcode = O_SETFIB; NEED1("missing fib number"); if (_substrcmp(*av, "tablearg") == 0) { action->arg1 = IP_FW_TARG; } else { action->arg1 = strtoul(*av, NULL, 10); if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) errx(EX_DATAERR, "fibs not suported.\n"); if (action->arg1 >= numfibs) /* Temporary */ errx(EX_DATAERR, "fib too large.\n"); /* Add high-order bit to fib to make room for tablearg*/ action->arg1 |= 0x8000; } av++; break; } case TOK_SETDSCP: { int code; action->opcode = O_SETDSCP; NEED1("missing DSCP code"); if (_substrcmp(*av, "tablearg") == 0) { action->arg1 = IP_FW_TARG; } else if (isalpha(*av[0])) { if ((code = match_token(f_ipdscp, *av)) == -1) errx(EX_DATAERR, "Unknown DSCP code"); action->arg1 = code; } else action->arg1 = strtoul(*av, NULL, 10); /* Add high-order bit to DSCP to make room for tablearg */ if (action->arg1 != IP_FW_TARG) action->arg1 |= 0x8000; av++; break; } case TOK_REASS: action->opcode = O_REASS; break; case TOK_RETURN: fill_cmd(action, O_CALLRETURN, F_NOT, 0); break; default: errx(EX_DATAERR, "invalid action %s\n", av[-1]); } action = next_cmd(action, &ablen); /* * [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 (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) { 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); CHECK_CMDLEN; cmd->opcode = O_LOG; if (av[0] && _substrcmp(*av, "logamount") == 0) { av++; NEED1("logamount requires argument"); l = atoi(*av); if (l < 0) errx(EX_DATAERR, "logamount must be positive"); c->max_log = l; av++; } else { len = sizeof(c->max_log); if (sysctlbyname("net.inet.ip.fw.verbose_limit", &c->max_log, &len, NULL, 0) == -1) { if (co.test_only) { c->max_log = 0; break; } errx(1, "sysctlbyname(\"%s\")", "net.inet.ip.fw.verbose_limit"); } } } break; #ifndef NO_ALTQ 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); CHECK_CMDLEN; cmd->opcode = O_ALTQ; a->qid = altq_name_to_qid(*av); av++; } break; #endif 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, IPFW_ARG_MIN, IPFW_ARG_MAX, i, rule_action_params); have_tag = cmd; fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag); av++; break; } default: abort(); } cmd = next_cmd(cmd, &cblen); } if (have_state) /* must be a check-state, we are done */ goto done; #define OR_START(target) \ if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \ if (open_par) \ errx(EX_USAGE, "nested \"(\" not allowed\n"); \ prev = NULL; \ open_par = 1; \ if ( (av[0])[1] == '\0') { \ av++; \ } else \ (*av)++; \ } \ target: \ #define CLOSE_PAR \ if (open_par) { \ if (av[0] && ( \ strcmp(*av, ")") == 0 || \ strcmp(*av, "}") == 0)) { \ prev = NULL; \ open_par = 0; \ av++; \ } else \ errx(EX_USAGE, "missing \")\"\n"); \ } #define NOT_BLOCK \ if (av[0] && _substrcmp(*av, "not") == 0) { \ if (cmd->len & F_NOT) \ errx(EX_USAGE, "double \"not\" not allowed\n"); \ cmd->len |= F_NOT; \ av++; \ } #define OR_BLOCK(target) \ if (av[0] && _substrcmp(*av, "or") == 0) { \ if (prev == NULL || open_par == 0) \ errx(EX_DATAERR, "invalid OR block"); \ prev->len |= F_OR; \ 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) { av++; /* the "MAC" keyword */ add_mac(cmd, av); /* exits in case of errors */ cmd = next_cmd(cmd); av += 2; /* dst-mac and src-mac */ NOT_BLOCK; NEED1("missing mac type"); if (add_mactype(cmd, av[0])) cmd = next_cmd(cmd); 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++; if (F_LEN(cmd) != 0) { prev = cmd; cmd = next_cmd(cmd, &cblen); } } else if (first_cmd != cmd) { errx(EX_DATAERR, "invalid protocol ``%s''", *av); } else goto read_options; OR_BLOCK(get_proto); /* * "from", mandatory */ if ((av[0] == NULL) || _substrcmp(*av, "from") != 0) errx(EX_USAGE, "missing ``from''"); av++; /* * source IP, mandatory */ OR_START(source_ip); NOT_BLOCK; /* optional "not" */ NEED1("missing source address"); if (add_src(cmd, *av, proto, cblen, tstate)) { av++; if (F_LEN(cmd) != 0) { /* ! any */ prev = cmd; cmd = next_cmd(cmd, &cblen); } } else errx(EX_USAGE, "bad source address %s", *av); OR_BLOCK(source_ip); /* * source ports, optional */ NOT_BLOCK; /* optional "not" */ if ( av[0] != NULL ) { if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { av++; if (F_LEN(cmd) != 0) cmd = next_cmd(cmd, &cblen); } } /* * "to", mandatory */ if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 ) errx(EX_USAGE, "missing ``to''"); av++; /* * destination, mandatory */ OR_START(dest_ip); NOT_BLOCK; /* optional "not" */ NEED1("missing dst address"); if (add_dst(cmd, *av, proto, cblen, tstate)) { av++; if (F_LEN(cmd) != 0) { /* ! any */ prev = cmd; cmd = next_cmd(cmd, &cblen); } } else errx( EX_USAGE, "bad destination address %s", *av); OR_BLOCK(dest_ip); /* * dest. ports, optional */ NOT_BLOCK; /* optional "not" */ if (av[0]) { if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) { av++; if (F_LEN(cmd) != 0) cmd = next_cmd(cmd, &cblen); } } read_options: if (av[0] && first_cmd == cmd) { /* * nothing specified so far, store in the rule to ease * printout later. */ rule->flags |= IPFW_RULE_NOOPT; } prev = NULL; while ( av[0] != NULL ) { 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); 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], cblen, tstate); 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++; break; case TOK_ICMP6TYPES: NEED1("icmptypes requires list of types"); fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen); av++; break; case TOK_IPTTL: NEED1("ipttl requires TTL"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_IPTTL, cblen)) errx(EX_DATAERR, "invalid ipttl %s", *av); } else fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_IPID: NEED1("ipid requires id"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_IPID, cblen)) errx(EX_DATAERR, "invalid ipid %s", *av); } else fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_IPLEN: NEED1("iplen requires length"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_IPLEN, cblen)) errx(EX_DATAERR, "invalid ip len %s", *av); } else fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_IPVER: NEED1("ipver requires version"); fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_IPPRECEDENCE: NEED1("ipprecedence requires value"); fill_cmd(cmd, O_IPPRECEDENCE, 0, (strtoul(*av, NULL, 0) & 7) << 5); av++; break; case TOK_DSCP: NEED1("missing DSCP code"); fill_dscp(cmd, *av, cblen); av++; break; case TOK_IPOPTS: NEED1("missing argument for ipoptions"); fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av); av++; break; case TOK_IPTOS: NEED1("missing argument for iptos"); fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av); 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); 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); 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); 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, cblen)) errx(EX_DATAERR, "invalid tcpdata len %s", *av); } else fill_cmd(cmd, O_TCPDATALEN, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_TCPOPTS: NEED1("missing argument for tcpoptions"); fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av); 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)); av++; break; case TOK_TCPWIN: NEED1("tcpwin requires length"); if (strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen)) errx(EX_DATAERR, "invalid tcpwin len %s", *av); } else fill_cmd(cmd, O_TCPWIN, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_TCPFLAGS: NEED1("missing argument for tcpflags"); cmd->opcode = O_TCPFLAGS; fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av); 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); CHECK_CMDLEN; cmd->opcode = O_LIMIT; c->limit_mask = c->conn_limit = 0; while ( av[0] != NULL ) { if ((val = match_token(limit_masks, *av)) <= 0) break; c->limit_mask |= val; av++; } if (c->limit_mask == 0) errx(EX_USAGE, "limit: missing limit mask"); GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX, TOK_LIMIT, rule_options); av++; break; } case TOK_PROTO: NEED1("missing protocol"); if (add_proto(cmd, *av, &proto)) { av++; } else errx(EX_DATAERR, "invalid protocol ``%s''", *av); break; case TOK_SRCIP: NEED1("missing source IP"); if (add_srcip(cmd, *av, cblen, tstate)) { av++; } break; case TOK_DSTIP: NEED1("missing destination IP"); if (add_dstip(cmd, *av, cblen, tstate)) { av++; } break; case TOK_SRCIP6: NEED1("missing source IP6"); if (add_srcip6(cmd, *av, cblen)) { av++; } break; case TOK_DSTIP6: NEED1("missing destination IP6"); if (add_dstip6(cmd, *av, cblen)) { av++; } break; case TOK_SRCPORT: NEED1("missing source port"); if (_substrcmp(*av, "any") == 0 || add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) { 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, cblen)) { av++; } else errx(EX_DATAERR, "invalid destination port %s", *av); break; case TOK_MAC: if (add_mac(cmd, av, cblen)) av += 2; break; case TOK_MACTYPE: NEED1("missing mac type"); if (!add_mactype(cmd, *av, cblen)) errx(EX_DATAERR, "invalid mac type %s", *av); 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 ); 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, cblen); av++; break; case TOK_COMMENT: fill_comment(cmd, av, cblen); av[0]=NULL; break; case TOK_TAGGED: if (av[0] && strpbrk(*av, "-,")) { if (!add_ports(cmd, *av, 0, O_TAGGED, cblen)) errx(EX_DATAERR, "tagged: invalid tag" " list: %s", *av); } else { uint16_t tag; GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, TOK_TAGGED, rule_options); fill_cmd(cmd, O_TAGGED, 0, tag); } av++; break; case TOK_FIB: NEED1("fib requires fib number"); fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0)); av++; break; case TOK_SOCKARG: fill_cmd(cmd, O_SOCKARG, 0, 0); break; case TOK_LOOKUP: { ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd; int j; if (!av[0] || !av[1]) errx(EX_USAGE, "format: lookup argument tablenum"); cmd->opcode = O_IP_DST_LOOKUP; cmd->len |= F_INSN_SIZE(ipfw_insn) + 2; i = match_token(rule_options, *av); for (j = 0; lookup_key[j] >= 0 ; j++) { if (i == lookup_key[j]) break; } if (lookup_key[j] <= 0) errx(EX_USAGE, "format: cannot lookup on %s", *av); __PAST_END(c->d, 1) = j; // i converted to option av++; if ((j = pack_table(tstate, *av, 0)) == 0) errx(EX_DATAERR, "Invalid table name: %s", *av); cmd->arg1 = j; av++; } break; case TOK_FLOW: NEED1("missing table name"); if (strncmp(*av, "table(", 6) != 0) errx(EX_DATAERR, "enclose table name into \"table()\""); fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate); 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, &cblen); } } 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, &rblen); } /* 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); CHECK_RBUFLEN(i); 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); CHECK_RBUFLEN(i); 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); CHECK_RBUFLEN(i); bcopy(have_log, dst, i * sizeof(uint32_t)); dst += i; } if (have_altq) { i = F_LEN(have_altq); CHECK_RBUFLEN(i); bcopy(have_altq, dst, i * sizeof(uint32_t)); dst += i; } if (have_tag) { i = F_LEN(have_tag); CHECK_RBUFLEN(i); 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); CHECK_RBUFLEN(i); bcopy(src, dst, i * sizeof(uint32_t)); dst += i; } rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); *rbufsize = (char *)dst - (char *)rule; } /* * Adds one or more rules to ipfw chain. * Data layout: * Request: * [ * ip_fw3_opheader * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1) * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3) * ] * Reply: * [ * ip_fw3_opheader * [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional) * [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] * ] * * Rules in reply are modified to store their actual ruleset number. * * (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending * accoring to their idx field and there has to be no duplicates. * (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending. * (*3) Each ip_fw structure needs to be aligned to u64 boundary. */ void ipfw_add(char *av[]) { uint32_t rulebuf[1024]; int rbufsize, default_off, tlen, rlen; size_t sz; struct tidx ts; struct ip_fw_rule *rule; caddr_t tbuf; ip_fw3_opheader *op3; ipfw_obj_ctlv *ctlv, *tstate; rbufsize = sizeof(rulebuf); memset(&ts, 0, sizeof(ts)); /* Optimize case with no tables */ default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader); op3 = (ip_fw3_opheader *)rulebuf; ctlv = (ipfw_obj_ctlv *)(op3 + 1); rule = (struct ip_fw_rule *)(ctlv + 1); rbufsize -= default_off; compile_rule(av, (uint32_t *)rule, &rbufsize, &ts); /* Align rule size to u64 boundary */ rlen = roundup2(rbufsize, sizeof(uint64_t)); tbuf = NULL; sz = 0; tstate = NULL; if (ts.count != 0) { /* Some tables. We have to alloc more data */ tlen = ts.count * sizeof(ipfw_obj_ntlv); sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen; if ((tbuf = calloc(1, sz)) == NULL) err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD"); op3 = (ip_fw3_opheader *)tbuf; /* Tables first */ ctlv = (ipfw_obj_ctlv *)(op3 + 1); ctlv->head.type = IPFW_TLV_TBLNAME_LIST; ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen; ctlv->count = ts.count; ctlv->objsize = sizeof(ipfw_obj_ntlv); memcpy(ctlv + 1, ts.idx, tlen); table_sort_ctlv(ctlv); tstate = ctlv; /* Rule next */ ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length); ctlv->head.type = IPFW_TLV_RULE_LIST; ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; ctlv->count = 1; memcpy(ctlv + 1, rule, rbufsize); } else { /* Simply add header */ sz = rlen + default_off; memset(ctlv, 0, sizeof(*ctlv)); ctlv->head.type = IPFW_TLV_RULE_LIST; ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen; ctlv->count = 1; } if (do_get3(IP_FW_XADD, op3, &sz) != 0) err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD"); if (!co.do_quiet) { struct format_opts sfo; struct buf_pr bp; memset(&sfo, 0, sizeof(sfo)); sfo.tstate = tstate; sfo.set_mask = (uint32_t)(-1); bp_alloc(&bp, 4096); show_static_rule(&co, &sfo, &bp, rule, NULL); printf("%s", bp.buf); bp_free(&bp); } if (tbuf != NULL) free(tbuf); if (ts.idx != NULL) free(ts.idx); } /* * clear the counters or the log counters. * optname has the following values: * 0 (zero both counters and logging) * 1 (zero logging only) */ void ipfw_zero(int ac, char *av[], int optname) { ipfw_range_tlv rt; uint32_t arg; int failed = EX_OK; char const *errstr; char const *name = optname ? "RESETLOG" : "ZERO"; optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO; memset(&rt, 0, sizeof(rt)); av++; ac--; if (ac == 0) { /* clear all entries */ rt.flags = IPFW_RCFLAG_ALL; if (do_range_cmd(optname, &rt) < 0) err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name); if (!co.do_quiet) printf("%s.\n", optname == IP_FW_XZERO ? "Accounting cleared":"Logging counts reset"); return; } while (ac) { /* Rule number */ if (isdigit(**av)) { arg = strtonum(*av, 0, 0xffff, &errstr); if (errstr) errx(EX_DATAERR, "invalid rule number %s\n", *av); rt.start_rule = arg; rt.end_rule = arg; rt.flags |= IPFW_RCFLAG_RANGE; if (co.use_set != 0) { rt.set = co.use_set - 1; rt.flags |= IPFW_RCFLAG_SET; } if (do_range_cmd(optname, &rt) != 0) { warn("rule %u: setsockopt(IP_FW_X%s)", arg, name); failed = EX_UNAVAILABLE; } else if (!co.do_quiet) printf("Entry %d %s.\n", arg, optname == IP_FW_XZERO ? "cleared" : "logging count reset"); } else { errx(EX_USAGE, "invalid rule number ``%s''", *av); } } if (failed != EX_OK) exit(failed); } void ipfw_flush(int force) { ipfw_range_tlv rt; if (!force && !co.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 (co.do_pipe) { dummynet_flush(); return; } /* `ipfw set N flush` - is the same that `ipfw delete set N` */ memset(&rt, 0, sizeof(rt)); if (co.use_set != 0) { rt.set = co.use_set - 1; rt.flags = IPFW_RCFLAG_SET; } else rt.flags = IPFW_RCFLAG_ALL; if (do_range_cmd(IP_FW_XDEL, &rt) != 0) err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)"); if (!co.do_quiet) printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules"); } static struct _s_x intcmds[] = { { "talist", TOK_TALIST }, { "iflist", TOK_IFLIST }, { NULL, 0 } }; void ipfw_internal_handler(int ac, char *av[]) { int tcmd; ac--; av++; NEED1("internal cmd required"); if ((tcmd = match_token(intcmds, *av)) == -1) errx(EX_USAGE, "invalid internal sub-cmd: %s", *av); switch (tcmd) { case TOK_IFLIST: ipfw_list_tifaces(); break; case TOK_TALIST: ipfw_list_ta(ac, av); break; } } static int ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh) { ipfw_obj_lheader req, *olh; size_t sz; int error; memset(&req, 0, sizeof(req)); sz = sizeof(req); error = do_get3(IP_FW_XIFLIST, &req.opheader, &sz); if (error != 0 && error != ENOMEM) return (error); sz = req.size; if ((olh = calloc(1, sz)) == NULL) return (ENOMEM); olh->size = sz; if ((error = do_get3(IP_FW_XIFLIST, &olh->opheader, &sz)) != 0) { free(olh); return (error); } *polh = olh; return (0); } static int ifinfo_cmp(const void *a, const void *b) { ipfw_iface_info *ia, *ib; ia = (ipfw_iface_info *)a; ib = (ipfw_iface_info *)b; return (stringnum_cmp(ia->ifname, ib->ifname)); } /* * Retrieves table list from kernel, * optionally sorts it and calls requested function for each table. * Returns 0 on success. */ static void ipfw_list_tifaces() { ipfw_obj_lheader *olh; ipfw_iface_info *info; int i, error; if ((error = ipfw_get_tracked_ifaces(&olh)) != 0) err(EX_OSERR, "Unable to request ipfw tracked interface list"); qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp); info = (ipfw_iface_info *)(olh + 1); for (i = 0; i < olh->count; i++) { if (info->flags & IPFW_IFFLAG_RESOLVED) printf("%s ifindex: %d refcount: %u changes: %u\n", info->ifname, info->ifindex, info->refcnt, info->gencnt); else printf("%s ifindex: unresolved refcount: %u changes: %u\n", info->ifname, info->refcnt, info->gencnt); info = (ipfw_iface_info *)((caddr_t)info + olh->objsize); } free(olh); }