2 * Copyright (c) 2002-2003 Luigi Rizzo
3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
4 * Copyright (c) 1994 Ugen J.S.Antsilevich
6 * Idea and grammar partially left from:
7 * Copyright (c) 1993 Daniel Boulet
9 * Redistribution and use in source forms, with and without modification,
10 * are permitted provided that this entire comment appears intact.
12 * Redistribution in binary form may occur without any restrictions.
13 * Obviously, it would be nice if you gave credit where credit is due
14 * but requiring it would be too onerous.
16 * This software is provided ``AS IS'' without any warranties of any kind.
18 * NEW command line interface for IP firewall facility
25 #include <sys/types.h>
26 #include <sys/socket.h>
38 #include <netinet/in.h>
39 #include <netinet/in_systm.h>
40 #include <netinet/ip.h>
41 #include <netinet/icmp6.h>
42 #include <netinet/ip_fw.h>
43 #include <arpa/inet.h>
45 #define CHECK_LENGTH(v, len) do { \
47 errx(EX_DATAERR, "Rule too long"); \
50 static struct _s_x icmp6codes[] = {
51 { "no-route", ICMP6_DST_UNREACH_NOROUTE },
52 { "admin-prohib", ICMP6_DST_UNREACH_ADMIN },
53 { "address", ICMP6_DST_UNREACH_ADDR },
54 { "port", ICMP6_DST_UNREACH_NOPORT },
59 fill_unreach6_code(u_short *codep, char *str)
64 val = strtoul(str, &s, 0);
65 if (s == str || *s != '\0' || val >= 0x100)
66 val = match_token(icmp6codes, str);
68 errx(EX_DATAERR, "unknown ICMPv6 unreachable code ``%s''", str);
74 print_unreach6_code(uint16_t code)
76 char const *s = match_value(icmp6codes, code);
79 printf("unreach6 %s", s);
81 printf("unreach6 %u", code);
85 * Print the ip address contained in a command.
88 print_ip6(ipfw_insn_ip6 *cmd, char const *s)
90 struct hostent *he = NULL;
91 int len = F_LEN((ipfw_insn *) cmd) - 1;
92 struct in6_addr *a = &(cmd->addr6);
95 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
97 if (cmd->o.opcode == O_IP6_SRC_ME || cmd->o.opcode == O_IP6_DST_ME) {
101 if (cmd->o.opcode == O_IP6) {
107 * len == 4 indicates a single IP, whereas lists of 1 or more
108 * addr/mask pairs have len = (2n+1). We convert len to n so we
109 * use that to count the number of entries.
112 for (len = len / 4; len > 0; len -= 2, a += 2) {
113 int mb = /* mask length */
114 (cmd->o.opcode == O_IP6_SRC || cmd->o.opcode == O_IP6_DST) ?
115 128 : contigmask((uint8_t *)&(a[1]), 128);
117 if (mb == 128 && co.do_resolv)
118 he = gethostbyaddr((char *)a, sizeof(*a), AF_INET6);
119 if (he != NULL) /* resolved to name */
120 printf("%s", he->h_name);
121 else if (mb == 0) /* any */
123 else { /* numeric IP followed by some kind of mask */
124 if (inet_ntop(AF_INET6, a, trad, sizeof( trad ) ) == NULL)
125 printf("Error ntop in print_ip6\n");
127 if (mb < 0) /* XXX not really legal... */
129 inet_ntop(AF_INET6, &a[1], trad, sizeof(trad)));
139 fill_icmp6types(ipfw_insn_icmp6 *cmd, char *av, int cblen)
143 CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_icmp6));
145 bzero(cmd, sizeof(*cmd));
149 type = strtoul(av, &av, 0);
150 if (*av != ',' && *av != '\0')
151 errx(EX_DATAERR, "invalid ICMP6 type");
153 * XXX: shouldn't this be 0xFF? I can't see any reason why
154 * we shouldn't be able to filter all possiable values
155 * regardless of the ability of the rest of the kernel to do
156 * anything useful with them.
158 if (type > ICMP6_MAXTYPE)
159 errx(EX_DATAERR, "ICMP6 type out of range");
160 cmd->d[type / 32] |= ( 1 << (type % 32));
162 cmd->o.opcode = O_ICMP6TYPE;
163 cmd->o.len |= F_INSN_SIZE(ipfw_insn_icmp6);
168 print_icmp6types(ipfw_insn_u32 *cmd)
173 printf(" ip6 icmp6types");
174 for (i = 0; i < 7; i++)
175 for (j=0; j < 32; ++j) {
176 if ( (cmd->d[i] & (1 << (j))) == 0)
178 printf("%c%d", sep, (i*32 + j));
184 print_flow6id( ipfw_insn_u32 *cmd)
186 uint16_t i, limit = cmd->o.arg1;
190 for( i=0; i < limit; ++i) {
193 printf("%d%c", cmd->d[i], sep);
197 /* structure and define for the extension header in ipv6 */
198 static struct _s_x ext6hdrcodes[] = {
199 { "frag", EXT_FRAGMENT },
200 { "hopopt", EXT_HOPOPTS },
201 { "route", EXT_ROUTING },
202 { "dstopt", EXT_DSTOPTS },
205 { "rthdr0", EXT_RTHDR0 },
206 { "rthdr2", EXT_RTHDR2 },
210 /* fills command for the extension header filtering */
212 fill_ext6hdr( ipfw_insn *cmd, char *av)
220 av = strsep( &s, ",") ;
221 tok = match_token(ext6hdrcodes, av);
224 cmd->arg1 |= EXT_FRAGMENT;
228 cmd->arg1 |= EXT_HOPOPTS;
232 cmd->arg1 |= EXT_ROUTING;
236 cmd->arg1 |= EXT_DSTOPTS;
244 cmd->arg1 |= EXT_ESP;
248 cmd->arg1 |= EXT_RTHDR0;
252 cmd->arg1 |= EXT_RTHDR2;
256 errx( EX_DATAERR, "invalid option for ipv6 exten header" );
262 cmd->opcode = O_EXT_HDR;
263 cmd->len |= F_INSN_SIZE( ipfw_insn );
268 print_ext6hdr( ipfw_insn *cmd )
272 printf(" extension header:");
273 if (cmd->arg1 & EXT_FRAGMENT ) {
274 printf("%cfragmentation", sep);
277 if (cmd->arg1 & EXT_HOPOPTS ) {
278 printf("%chop options", sep);
281 if (cmd->arg1 & EXT_ROUTING ) {
282 printf("%crouting options", sep);
285 if (cmd->arg1 & EXT_RTHDR0 ) {
286 printf("%crthdr0", sep);
289 if (cmd->arg1 & EXT_RTHDR2 ) {
290 printf("%crthdr2", sep);
293 if (cmd->arg1 & EXT_DSTOPTS ) {
294 printf("%cdestination options", sep);
297 if (cmd->arg1 & EXT_AH ) {
298 printf("%cauthentication header", sep);
301 if (cmd->arg1 & EXT_ESP ) {
302 printf("%cencapsulated security payload", sep);
306 /* Try to find ipv6 address by hostname */
308 lookup_host6 (char *host, struct in6_addr *ip6addr)
312 if (!inet_pton(AF_INET6, host, ip6addr)) {
313 if ((he = gethostbyname2(host, AF_INET6)) == NULL)
315 memcpy(ip6addr, he->h_addr_list[0], sizeof( struct in6_addr));
322 * fill the addr and mask fields in the instruction as appropriate from av.
323 * Update length as appropriate.
324 * The following formats are allowed:
325 * any matches any IP6. Actually returns an empty instruction.
326 * me returns O_IP6_*_ME
328 * 03f1::234:123:0342 single IP6 addres
329 * 03f1::234:123:0342/24 address/mask
330 * 03f1::234:123:0342/24,03f1::234:123:0343/ List of address
332 * Set of address (as in ipv6) not supported because ipv6 address
333 * are typically random past the initial prefix.
334 * Return 1 on success, 0 on failure.
337 fill_ip6(ipfw_insn_ip6 *cmd, char *av, int cblen)
340 struct in6_addr *d = &(cmd->addr6);
342 * Needed for multiple address.
343 * Note d[1] points to struct in6_add r mask6 of cmd
346 cmd->o.len &= ~F_LEN_MASK; /* zero len */
348 if (strcmp(av, "any") == 0)
352 if (strcmp(av, "me") == 0) { /* Set the data for "me" opt*/
353 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
357 if (strcmp(av, "me6") == 0) { /* Set the data for "me" opt*/
358 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
362 if (strncmp(av, "table(", 6) == 0) {
363 char *p = strchr(av + 6, ',');
364 uint32_t *dm = ((ipfw_insn_u32 *)cmd)->d;
368 cmd->o.opcode = O_IP_DST_LOOKUP;
369 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
371 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
372 dm[0] = strtoul(p, NULL, 0);
374 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
381 * After the address we can have '/' indicating a mask,
382 * or ',' indicating another address follows.
389 CHECK_LENGTH(cblen, 1 + len + 2 * F_INSN_SIZE(struct in6_addr));
391 if ((p = strpbrk(av, "/,")) ) {
392 md = *p; /* save the separator */
393 *p = '\0'; /* terminate address string */
394 p++; /* and skip past it */
396 /* now p points to NULL, mask or next entry */
398 /* lookup stores address in *d as a side effect */
399 if (lookup_host6(av, d) != 0) {
400 /* XXX: failed. Free memory and go */
401 errx(EX_DATAERR, "bad address \"%s\"", av);
403 /* next, look at the mask, if any */
404 masklen = (md == '/') ? atoi(p) : 128;
405 if (masklen > 128 || masklen < 0)
406 errx(EX_DATAERR, "bad width \"%s\''", p);
408 n2mask(&d[1], masklen);
410 APPLY_MASK(d, &d[1]) /* mask base address with mask */
412 /* find next separator */
414 if (md == '/') { /* find separator past the mask */
421 /* Check this entry */
424 * 'any' turns the entire list into a NOP.
425 * 'not any' never matches, so it is removed from the
426 * list unless it is the only item, in which case we
429 if (cmd->o.len & F_NOT && av == NULL && len == 0)
430 errx(EX_DATAERR, "not any never matches");
435 * A single IP can be stored alone
437 if (masklen == 128 && av == NULL && len == 0) {
438 len = F_INSN_SIZE(struct in6_addr);
442 /* Update length and pointer to arguments */
443 len += F_INSN_SIZE(struct in6_addr)*2;
448 * Total length of the command, remember that 1 is the size of
451 if (len + 1 > F_LEN_MASK)
452 errx(EX_DATAERR, "address list too long");
459 * fills command for ipv6 flow-id filtering
460 * note that the 20 bit flow number is stored in a array of u_int32_t
461 * it's supported lists of flow-id, so in the o.arg1 we store how many
462 * additional flow-id we want to filter, the basic is 1
465 fill_flow6( ipfw_insn_u32 *cmd, char *av, int cblen)
467 u_int32_t type; /* Current flow number */
468 u_int16_t nflow = 0; /* Current flow index */
470 cmd->d[0] = 0; /* Initializing the base number*/
473 CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_u32) + nflow + 1);
475 av = strsep( &s, ",") ;
476 type = strtoul(av, &av, 0);
477 if (*av != ',' && *av != '\0')
478 errx(EX_DATAERR, "invalid ipv6 flow number %s", av);
480 errx(EX_DATAERR, "flow number out of range %s", av);
481 cmd->d[nflow] |= type;
485 cmd->o.opcode = O_FLOW6ID;
486 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + nflow;
490 errx(EX_DATAERR, "invalid ipv6 flow number %s", av);
495 add_srcip6(ipfw_insn *cmd, char *av, int cblen)
498 fill_ip6((ipfw_insn_ip6 *)cmd, av, cblen);
499 if (cmd->opcode == O_IP_DST_SET) /* set */
500 cmd->opcode = O_IP_SRC_SET;
501 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */
502 cmd->opcode = O_IP_SRC_LOOKUP;
503 else if (F_LEN(cmd) == 0) { /* any */
504 } else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */
505 cmd->opcode = O_IP6_SRC_ME;
506 } else if (F_LEN(cmd) ==
507 (F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) {
508 /* single IP, no mask*/
509 cmd->opcode = O_IP6_SRC;
510 } else { /* addr/mask opt */
511 cmd->opcode = O_IP6_SRC_MASK;
517 add_dstip6(ipfw_insn *cmd, char *av, int cblen)
520 fill_ip6((ipfw_insn_ip6 *)cmd, av, cblen);
521 if (cmd->opcode == O_IP_DST_SET) /* set */
523 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */
525 else if (F_LEN(cmd) == 0) { /* any */
526 } else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */
527 cmd->opcode = O_IP6_DST_ME;
528 } else if (F_LEN(cmd) ==
529 (F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) {
530 /* single IP, no mask*/
531 cmd->opcode = O_IP6_DST;
532 } else { /* addr/mask opt */
533 cmd->opcode = O_IP6_DST_MASK;