2 * iptunnel.c "ip tunnel"
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <arpa/inet.h>
20 #include <sys/ioctl.h>
22 #include <net/if_arp.h>
24 #include <linux/if_tunnel.h>
28 #include "ip_common.h"
31 static void usage(void) __attribute__((noreturn));
33 static void usage(void)
35 fprintf(stderr, "Usage: ip tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n");
36 fprintf(stderr, " [ mode { ipip | gre | sit | isatap } ] [ remote ADDR ] [ local ADDR ]\n");
37 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
38 fprintf(stderr, " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n");
39 fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
40 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
41 fprintf(stderr, "\n");
42 fprintf(stderr, "Where: NAME := STRING\n");
43 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
44 fprintf(stderr, " TOS := { NUMBER | inherit }\n");
45 fprintf(stderr, " TTL := { 1..255 | inherit }\n");
46 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
50 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
53 char medium[IFNAMSIZ];
56 memset(p, 0, sizeof(*p));
57 memset(&medium, 0, sizeof(medium));
62 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
64 p->iph.frag_off = htons(IP_DF);
67 if (strcmp(*argv, "mode") == 0) {
69 if (strcmp(*argv, "ipip") == 0 ||
70 strcmp(*argv, "ip/ip") == 0) {
71 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
72 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
75 p->iph.protocol = IPPROTO_IPIP;
76 } else if (strcmp(*argv, "gre") == 0 ||
77 strcmp(*argv, "gre/ip") == 0) {
78 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
79 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
82 p->iph.protocol = IPPROTO_GRE;
83 } else if (strcmp(*argv, "sit") == 0 ||
84 strcmp(*argv, "ipv6/ip") == 0) {
85 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
86 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
89 p->iph.protocol = IPPROTO_IPV6;
90 } else if (strcmp(*argv, "isatap") == 0) {
91 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
92 fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
95 p->iph.protocol = IPPROTO_IPV6;
98 fprintf(stderr,"Cannot guess tunnel mode.\n");
101 } else if (strcmp(*argv, "key") == 0) {
104 p->i_flags |= GRE_KEY;
105 p->o_flags |= GRE_KEY;
106 if (strchr(*argv, '.'))
107 p->i_key = p->o_key = get_addr32(*argv);
109 if (get_unsigned(&uval, *argv, 0)<0) {
110 fprintf(stderr, "invalid value of \"key\"\n");
113 p->i_key = p->o_key = htonl(uval);
115 } else if (strcmp(*argv, "ikey") == 0) {
118 p->i_flags |= GRE_KEY;
119 if (strchr(*argv, '.'))
120 p->i_key = get_addr32(*argv);
122 if (get_unsigned(&uval, *argv, 0)<0) {
123 fprintf(stderr, "invalid value of \"ikey\"\n");
126 p->i_key = htonl(uval);
128 } else if (strcmp(*argv, "okey") == 0) {
131 p->o_flags |= GRE_KEY;
132 if (strchr(*argv, '.'))
133 p->o_key = get_addr32(*argv);
135 if (get_unsigned(&uval, *argv, 0)<0) {
136 fprintf(stderr, "invalid value of \"okey\"\n");
139 p->o_key = htonl(uval);
141 } else if (strcmp(*argv, "seq") == 0) {
142 p->i_flags |= GRE_SEQ;
143 p->o_flags |= GRE_SEQ;
144 } else if (strcmp(*argv, "iseq") == 0) {
145 p->i_flags |= GRE_SEQ;
146 } else if (strcmp(*argv, "oseq") == 0) {
147 p->o_flags |= GRE_SEQ;
148 } else if (strcmp(*argv, "csum") == 0) {
149 p->i_flags |= GRE_CSUM;
150 p->o_flags |= GRE_CSUM;
151 } else if (strcmp(*argv, "icsum") == 0) {
152 p->i_flags |= GRE_CSUM;
153 } else if (strcmp(*argv, "ocsum") == 0) {
154 p->o_flags |= GRE_CSUM;
155 } else if (strcmp(*argv, "nopmtudisc") == 0) {
157 } else if (strcmp(*argv, "pmtudisc") == 0) {
158 p->iph.frag_off = htons(IP_DF);
159 } else if (strcmp(*argv, "remote") == 0) {
161 if (strcmp(*argv, "any"))
162 p->iph.daddr = get_addr32(*argv);
163 } else if (strcmp(*argv, "local") == 0) {
165 if (strcmp(*argv, "any"))
166 p->iph.saddr = get_addr32(*argv);
167 } else if (strcmp(*argv, "dev") == 0) {
169 strncpy(medium, *argv, IFNAMSIZ-1);
170 } else if (strcmp(*argv, "ttl") == 0 ||
171 strcmp(*argv, "hoplimit") == 0) {
174 if (strcmp(*argv, "inherit") != 0) {
175 if (get_unsigned(&uval, *argv, 0))
176 invarg("invalid TTL\n", *argv);
178 invarg("TTL must be <=255\n", *argv);
181 } else if (strcmp(*argv, "tos") == 0 ||
182 strcmp(*argv, "tclass") == 0 ||
183 matches(*argv, "dsfield") == 0) {
186 if (strcmp(*argv, "inherit") != 0) {
187 if (rtnl_dsfield_a2n(&uval, *argv))
188 invarg("bad TOS value", *argv);
193 if (strcmp(*argv, "name") == 0) {
195 } else if (matches(*argv, "help") == 0)
198 duparg2("name", *argv);
199 strncpy(p->name, *argv, IFNAMSIZ);
200 if (cmd == SIOCCHGTUNNEL && count == 0) {
201 struct ip_tunnel_parm old_p;
202 memset(&old_p, 0, sizeof(old_p));
203 if (tnl_get_ioctl(*argv, &old_p))
213 if (p->iph.protocol == 0) {
214 if (memcmp(p->name, "gre", 3) == 0)
215 p->iph.protocol = IPPROTO_GRE;
216 else if (memcmp(p->name, "ipip", 4) == 0)
217 p->iph.protocol = IPPROTO_IPIP;
218 else if (memcmp(p->name, "sit", 3) == 0)
219 p->iph.protocol = IPPROTO_IPV6;
220 else if (memcmp(p->name, "isatap", 6) == 0) {
221 p->iph.protocol = IPPROTO_IPV6;
226 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
227 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
228 fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
234 p->link = if_nametoindex(medium);
239 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
240 p->i_key = p->iph.daddr;
241 p->i_flags |= GRE_KEY;
243 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
244 p->o_key = p->iph.daddr;
245 p->o_flags |= GRE_KEY;
247 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
248 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
252 p->i_flags |= SIT_ISATAP;
258 static int do_add(int cmd, int argc, char **argv)
260 struct ip_tunnel_parm p;
262 if (parse_args(argc, argv, cmd, &p) < 0)
265 if (p.iph.ttl && p.iph.frag_off == 0) {
266 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
270 switch (p.iph.protocol) {
272 return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
274 return tnl_add_ioctl(cmd, "gre0", p.name, &p);
276 return tnl_add_ioctl(cmd, "sit0", p.name, &p);
278 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
284 static int do_del(int argc, char **argv)
286 struct ip_tunnel_parm p;
288 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
291 switch (p.iph.protocol) {
293 return tnl_del_ioctl("tunl0", p.name, &p);
295 return tnl_del_ioctl("gre0", p.name, &p);
297 return tnl_del_ioctl("sit0", p.name, &p);
299 return tnl_del_ioctl(p.name, p.name, &p);
304 static void print_tunnel(struct ip_tunnel_parm *p)
306 struct ip_tunnel_6rd ip6rd;
310 memset(&ip6rd, 0, sizeof(ip6rd));
312 /* Do not use format_host() for local addr,
313 * symbolic name will not be useful.
315 printf("%s: %s/ip remote %s local %s ",
317 tnl_strproto(p->iph.protocol),
318 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
319 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
321 if (p->i_flags & SIT_ISATAP) {
322 struct ip_tunnel_prl prl[16];
325 memset(prl, 0, sizeof(prl));
326 prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
327 prl[0].addr = htonl(INADDR_ANY);
329 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
330 for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++)
332 if (prl[i].addr != htonl(INADDR_ANY)) {
334 (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
335 format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1)));
341 const char *n = ll_index_to_name(p->link);
343 printf(" dev %s ", n);
347 printf(" ttl %d ", p->iph.ttl);
349 printf(" ttl inherit ");
357 printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
358 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
361 if (!(p->iph.frag_off&htons(IP_DF)))
362 printf(" nopmtudisc");
364 if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
365 printf(" 6rd-prefix %s/%u ",
366 inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
368 if (ip6rd.relay_prefix) {
369 printf("6rd-relay_prefix %s/%u ",
370 format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)),
371 ip6rd.relay_prefixlen);
375 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
376 printf(" key %u", ntohl(p->i_key));
377 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
378 if (p->i_flags&GRE_KEY)
379 printf(" ikey %u ", ntohl(p->i_key));
380 if (p->o_flags&GRE_KEY)
381 printf(" okey %u ", ntohl(p->o_key));
384 if (p->i_flags&GRE_SEQ)
385 printf("%s Drop packets out of sequence.\n", _SL_);
386 if (p->i_flags&GRE_CSUM)
387 printf("%s Checksum in received packet is required.", _SL_);
388 if (p->o_flags&GRE_SEQ)
389 printf("%s Sequence packets on output.", _SL_);
390 if (p->o_flags&GRE_CSUM)
391 printf("%s Checksum output packets.", _SL_);
394 static int do_tunnels_list(struct ip_tunnel_parm *p)
397 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
399 tx_bytes, tx_packets, tx_errs, tx_drops,
400 tx_fifo, tx_colls, tx_carrier, rx_multi;
401 struct ip_tunnel_parm p1;
404 FILE *fp = fopen("/proc/net/dev", "r");
410 fgets(buf, sizeof(buf), fp);
411 fgets(buf, sizeof(buf), fp);
413 while (fgets(buf, sizeof(buf), fp) != NULL) {
416 buf[sizeof(buf) - 1] = 0;
417 if ((ptr = strchr(buf, ':')) == NULL ||
418 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
419 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
422 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
423 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
424 &rx_fifo, &rx_frame, &rx_multi,
425 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
426 &tx_fifo, &tx_colls, &tx_carrier) != 14)
428 if (p->name[0] && strcmp(p->name, name))
430 index = ll_name_to_index(name);
433 type = ll_index_to_type(index);
435 fprintf(stderr, "Failed to get type of [%s]\n", name);
438 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
440 memset(&p1, 0, sizeof(p1));
441 if (tnl_get_ioctl(name, &p1))
443 if ((p->link && p1.link != p->link) ||
444 (p->name[0] && strcmp(p1.name, p->name)) ||
445 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
446 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
447 (p->i_key && p1.i_key != p->i_key))
452 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
453 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
454 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
455 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
456 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
457 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
464 static int do_show(int argc, char **argv)
467 struct ip_tunnel_parm p;
470 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
473 switch (p.iph.protocol) {
475 err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
478 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
481 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
495 static int do_prl(int argc, char **argv)
497 struct ip_tunnel_prl p;
501 char medium[IFNAMSIZ];
503 memset(&p, 0, sizeof(p));
504 memset(&medium, 0, sizeof(medium));
507 if (strcmp(*argv, "prl-default") == 0) {
510 p.addr = get_addr32(*argv);
511 p.flags |= PRL_DEFAULT;
513 } else if (strcmp(*argv, "prl-nodefault") == 0) {
516 p.addr = get_addr32(*argv);
518 } else if (strcmp(*argv, "prl-delete") == 0) {
521 p.addr = get_addr32(*argv);
523 } else if (strcmp(*argv, "dev") == 0) {
525 strncpy(medium, *argv, IFNAMSIZ-1);
528 fprintf(stderr,"%s: Invalid PRL parameter.\n", *argv);
532 fprintf(stderr,"One PRL entry at a time.\n");
538 fprintf(stderr, "Must specify dev.\n");
542 return tnl_prl_ioctl(cmd, medium, &p);
545 static int do_6rd(int argc, char **argv)
547 struct ip_tunnel_6rd ip6rd;
550 char medium[IFNAMSIZ];
553 memset(&ip6rd, 0, sizeof(ip6rd));
554 memset(&medium, 0, sizeof(medium));
557 if (strcmp(*argv, "6rd-prefix") == 0) {
559 if (get_prefix(&prefix, *argv, AF_INET6))
560 invarg("invalid 6rd_prefix\n", *argv);
562 memcpy(&ip6rd.prefix, prefix.data, 16);
563 ip6rd.prefixlen = prefix.bitlen;
564 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
566 if (get_prefix(&prefix, *argv, AF_INET))
567 invarg("invalid 6rd-relay_prefix\n", *argv);
569 memcpy(&ip6rd.relay_prefix, prefix.data, 4);
570 ip6rd.relay_prefixlen = prefix.bitlen;
571 } else if (strcmp(*argv, "6rd-reset") == 0) {
573 } else if (strcmp(*argv, "dev") == 0) {
575 strncpy(medium, *argv, IFNAMSIZ-1);
578 fprintf(stderr,"%s: Invalid 6RD parameter.\n", *argv);
584 fprintf(stderr, "Must specify dev.\n");
588 return tnl_6rd_ioctl(cmd, medium, &ip6rd);
591 int do_iptunnel(int argc, char **argv)
593 switch (preferred_family) {
595 preferred_family = AF_INET;
600 * This is silly enough but we have no easy way to make it
601 * protocol-independent because of unarranged structure between
605 return do_ip6tunnel(argc, argv);
607 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
612 if (matches(*argv, "add") == 0)
613 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
614 if (matches(*argv, "change") == 0)
615 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
616 if (matches(*argv, "del") == 0)
617 return do_del(argc-1, argv+1);
618 if (matches(*argv, "show") == 0 ||
619 matches(*argv, "lst") == 0 ||
620 matches(*argv, "list") == 0)
621 return do_show(argc-1, argv+1);
622 if (matches(*argv, "prl") == 0)
623 return do_prl(argc-1, argv+1);
624 if (matches(*argv, "6rd") == 0)
625 return do_6rd(argc-1, argv+1);
626 if (matches(*argv, "help") == 0)
629 return do_show(0, NULL);
631 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);