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>
14 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
15 * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
16 * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <arpa/inet.h>
26 #include <sys/ioctl.h>
28 #include <linux/if_arp.h>
30 #include <linux/if_tunnel.h>
34 #include "ip_common.h"
37 static void usage(void) __attribute__((noreturn));
39 static void usage(void)
41 fprintf(stderr, "Usage: ip tunnel { add | change | del | show } [ NAME ]\n");
42 fprintf(stderr, " [ mode { ipip | gre | sit | isatap } ] [ remote ADDR ] [ local ADDR ]\n");
43 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
44 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
45 fprintf(stderr, "\n");
46 fprintf(stderr, "Where: NAME := STRING\n");
47 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
48 fprintf(stderr, " TOS := { NUMBER | inherit }\n");
49 fprintf(stderr, " TTL := { 1..255 | inherit }\n");
50 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
54 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
57 char medium[IFNAMSIZ];
60 memset(p, 0, sizeof(*p));
61 memset(&medium, 0, sizeof(medium));
66 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
68 p->iph.frag_off = htons(IP_DF);
71 if (strcmp(*argv, "mode") == 0) {
73 if (strcmp(*argv, "ipip") == 0 ||
74 strcmp(*argv, "ip/ip") == 0) {
75 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
76 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
79 p->iph.protocol = IPPROTO_IPIP;
80 } else if (strcmp(*argv, "gre") == 0 ||
81 strcmp(*argv, "gre/ip") == 0) {
82 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
83 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
86 p->iph.protocol = IPPROTO_GRE;
87 } else if (strcmp(*argv, "sit") == 0 ||
88 strcmp(*argv, "ipv6/ip") == 0) {
89 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
90 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
93 p->iph.protocol = IPPROTO_IPV6;
94 } else if (strcmp(*argv, "isatap") == 0) {
95 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
96 fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
99 p->iph.protocol = IPPROTO_IPV6;
102 fprintf(stderr,"Cannot guess tunnel mode.\n");
105 } else if (strcmp(*argv, "key") == 0) {
108 p->i_flags |= GRE_KEY;
109 p->o_flags |= GRE_KEY;
110 if (strchr(*argv, '.'))
111 p->i_key = p->o_key = get_addr32(*argv);
113 if (get_unsigned(&uval, *argv, 0)<0) {
114 fprintf(stderr, "invalid value of \"key\"\n");
117 p->i_key = p->o_key = htonl(uval);
119 } else if (strcmp(*argv, "ikey") == 0) {
122 p->i_flags |= GRE_KEY;
123 if (strchr(*argv, '.'))
124 p->i_key = get_addr32(*argv);
126 if (get_unsigned(&uval, *argv, 0)<0) {
127 fprintf(stderr, "invalid value of \"ikey\"\n");
130 p->i_key = htonl(uval);
132 } else if (strcmp(*argv, "okey") == 0) {
135 p->o_flags |= GRE_KEY;
136 if (strchr(*argv, '.'))
137 p->o_key = get_addr32(*argv);
139 if (get_unsigned(&uval, *argv, 0)<0) {
140 fprintf(stderr, "invalid value of \"okey\"\n");
143 p->o_key = htonl(uval);
145 } else if (strcmp(*argv, "seq") == 0) {
146 p->i_flags |= GRE_SEQ;
147 p->o_flags |= GRE_SEQ;
148 } else if (strcmp(*argv, "iseq") == 0) {
149 p->i_flags |= GRE_SEQ;
150 } else if (strcmp(*argv, "oseq") == 0) {
151 p->o_flags |= GRE_SEQ;
152 } else if (strcmp(*argv, "csum") == 0) {
153 p->i_flags |= GRE_CSUM;
154 p->o_flags |= GRE_CSUM;
155 } else if (strcmp(*argv, "icsum") == 0) {
156 p->i_flags |= GRE_CSUM;
157 } else if (strcmp(*argv, "ocsum") == 0) {
158 p->o_flags |= GRE_CSUM;
159 } else if (strcmp(*argv, "nopmtudisc") == 0) {
161 } else if (strcmp(*argv, "pmtudisc") == 0) {
162 p->iph.frag_off = htons(IP_DF);
163 } else if (strcmp(*argv, "remote") == 0) {
165 if (strcmp(*argv, "any"))
166 p->iph.daddr = get_addr32(*argv);
167 } else if (strcmp(*argv, "local") == 0) {
169 if (strcmp(*argv, "any"))
170 p->iph.saddr = get_addr32(*argv);
171 } else if (strcmp(*argv, "dev") == 0) {
173 strncpy(medium, *argv, IFNAMSIZ-1);
174 } else if (strcmp(*argv, "ttl") == 0 ||
175 strcmp(*argv, "hoplimit") == 0) {
178 if (strcmp(*argv, "inherit") != 0) {
179 if (get_unsigned(&uval, *argv, 0))
180 invarg("invalid TTL\n", *argv);
182 invarg("TTL must be <=255\n", *argv);
185 } else if (strcmp(*argv, "tos") == 0 ||
186 strcmp(*argv, "tclass") == 0 ||
187 matches(*argv, "dsfield") == 0) {
190 if (strcmp(*argv, "inherit") != 0) {
191 if (rtnl_dsfield_a2n(&uval, *argv))
192 invarg("bad TOS value", *argv);
197 if (strcmp(*argv, "name") == 0) {
199 } else if (matches(*argv, "help") == 0)
202 duparg2("name", *argv);
203 strncpy(p->name, *argv, IFNAMSIZ);
204 if (cmd == SIOCCHGTUNNEL && count == 0) {
205 struct ip_tunnel_parm old_p;
206 memset(&old_p, 0, sizeof(old_p));
207 if (tnl_get_ioctl(*argv, &old_p))
217 if (p->iph.protocol == 0) {
218 if (memcmp(p->name, "gre", 3) == 0)
219 p->iph.protocol = IPPROTO_GRE;
220 else if (memcmp(p->name, "ipip", 4) == 0)
221 p->iph.protocol = IPPROTO_IPIP;
222 else if (memcmp(p->name, "sit", 3) == 0)
223 p->iph.protocol = IPPROTO_IPV6;
224 else if (memcmp(p->name, "isatap", 6) == 0) {
225 p->iph.protocol = IPPROTO_IPV6;
230 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
231 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
232 fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
238 p->link = tnl_ioctl_get_ifindex(medium);
243 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
244 p->i_key = p->iph.daddr;
245 p->i_flags |= GRE_KEY;
247 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
248 p->o_key = p->iph.daddr;
249 p->o_flags |= GRE_KEY;
251 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
252 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
256 p->i_flags |= SIT_ISATAP;
262 static int do_add(int cmd, int argc, char **argv)
264 struct ip_tunnel_parm p;
266 if (parse_args(argc, argv, cmd, &p) < 0)
269 if (p.iph.ttl && p.iph.frag_off == 0) {
270 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
274 switch (p.iph.protocol) {
276 return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
278 return tnl_add_ioctl(cmd, "gre0", p.name, &p);
280 return tnl_add_ioctl(cmd, "sit0", p.name, &p);
282 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
288 static int do_del(int argc, char **argv)
290 struct ip_tunnel_parm p;
292 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
295 switch (p.iph.protocol) {
297 return tnl_del_ioctl("tunl0", p.name, &p);
299 return tnl_del_ioctl("gre0", p.name, &p);
301 return tnl_del_ioctl("sit0", p.name, &p);
303 return tnl_del_ioctl(p.name, p.name, &p);
308 static void print_tunnel(struct ip_tunnel_parm *p)
315 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
316 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
318 /* Do not use format_host() for local addr,
319 * symbolic name will not be useful.
321 printf("%s: %s/ip remote %s local %s ",
323 tnl_strproto(p->iph.protocol),
324 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
325 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
328 char *n = tnl_ioctl_get_ifname(p->link);
330 printf(" dev %s ", n);
334 printf(" ttl %d ", p->iph.ttl);
336 printf(" ttl inherit ");
344 printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
345 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
348 if (!(p->iph.frag_off&htons(IP_DF)))
349 printf(" nopmtudisc");
351 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
352 printf(" key %s", s3);
353 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
354 if (p->i_flags&GRE_KEY)
355 printf(" ikey %s ", s3);
356 if (p->o_flags&GRE_KEY)
357 printf(" okey %s ", s4);
360 if (p->i_flags&GRE_SEQ)
361 printf("%s Drop packets out of sequence.\n", _SL_);
362 if (p->i_flags&GRE_CSUM)
363 printf("%s Checksum in received packet is required.", _SL_);
364 if (p->o_flags&GRE_SEQ)
365 printf("%s Sequence packets on output.", _SL_);
366 if (p->o_flags&GRE_CSUM)
367 printf("%s Checksum output packets.", _SL_);
370 static int do_tunnels_list(struct ip_tunnel_parm *p)
373 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
375 tx_bytes, tx_packets, tx_errs, tx_drops,
376 tx_fifo, tx_colls, tx_carrier, rx_multi;
378 struct ip_tunnel_parm p1;
381 FILE *fp = fopen("/proc/net/dev", "r");
387 fgets(buf, sizeof(buf), fp);
388 fgets(buf, sizeof(buf), fp);
390 while (fgets(buf, sizeof(buf), fp) != NULL) {
392 buf[sizeof(buf) - 1] = 0;
393 if ((ptr = strchr(buf, ':')) == NULL ||
394 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
395 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
398 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
399 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
400 &rx_fifo, &rx_frame, &rx_multi,
401 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
402 &tx_fifo, &tx_colls, &tx_carrier) != 14)
404 if (p->name[0] && strcmp(p->name, name))
406 type = tnl_ioctl_get_iftype(name);
408 fprintf(stderr, "Failed to get type of [%s]\n", name);
411 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
413 memset(&p1, 0, sizeof(p1));
414 if (tnl_get_ioctl(name, &p1))
416 if ((p->link && p1.link != p->link) ||
417 (p->name[0] && strcmp(p1.name, p->name)) ||
418 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
419 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
420 (p->i_key && p1.i_key != p->i_key))
425 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
426 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
427 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
428 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
429 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
430 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
437 static int do_show(int argc, char **argv)
440 struct ip_tunnel_parm p;
442 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
445 switch (p.iph.protocol) {
447 err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
450 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
453 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
467 int do_iptunnel(int argc, char **argv)
469 switch (preferred_family) {
471 preferred_family = AF_INET;
476 * This is silly enough but we have no easy way to make it
477 * protocol-independent because of unarranged structure between
481 return do_ip6tunnel(argc, argv);
483 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
488 if (matches(*argv, "add") == 0)
489 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
490 if (matches(*argv, "change") == 0)
491 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
492 if (matches(*argv, "del") == 0)
493 return do_del(argc-1, argv+1);
494 if (matches(*argv, "show") == 0 ||
495 matches(*argv, "lst") == 0 ||
496 matches(*argv, "list") == 0)
497 return do_show(argc-1, argv+1);
498 if (matches(*argv, "help") == 0)
501 return do_show(0, NULL);
503 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);