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
24 #include <sys/socket.h>
25 #include <sys/ioctl.h>
27 #include <linux/if_arp.h>
28 #include <netinet/in.h>
29 #include <netinet/ip.h>
30 #include <arpa/inet.h>
31 #include <linux/if_tunnel.h>
34 #define GRE_CSUM htons(0x8000)
36 #define GRE_ROUTING htons(0x4000)
38 #define GRE_KEY htons(0x2000)
40 #define GRE_SEQ htons(0x1000)
42 #define GRE_STRICT htons(0x0800)
44 #define GRE_REC htons(0x0700)
46 #define GRE_FLAGS htons(0x00F8)
48 #define GRE_VERSION htons(0x0007)
52 static void usage(void) __attribute__((noreturn));
54 static void usage(void)
56 fprintf(stderr, "Usage: iptunnel { add | change | del | show } [ NAME ]\n");
57 fprintf(stderr, " [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n");
58 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
59 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ nopmtudisc ] [ dev PHYS_DEV ]\n");
60 fprintf(stderr, "\n");
61 fprintf(stderr, "Where: NAME := STRING\n");
62 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
63 fprintf(stderr, " TOS := { NUMBER | inherit }\n");
64 fprintf(stderr, " TTL := { 1..255 | inherit }\n");
65 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
69 static int do_ioctl_get_ifindex(char *dev)
75 strcpy(ifr.ifr_name, dev);
76 fd = socket(AF_INET, SOCK_DGRAM, 0);
77 err = ioctl(fd, SIOCGIFINDEX, &ifr);
83 return ifr.ifr_ifindex;
86 static int do_ioctl_get_iftype(char *dev)
92 strcpy(ifr.ifr_name, dev);
93 fd = socket(AF_INET, SOCK_DGRAM, 0);
94 err = ioctl(fd, SIOCGIFHWADDR, &ifr);
100 return ifr.ifr_addr.sa_family;
104 static char * do_ioctl_get_ifname(int idx)
106 static struct ifreq ifr;
110 ifr.ifr_ifindex = idx;
111 fd = socket(AF_INET, SOCK_DGRAM, 0);
112 err = ioctl(fd, SIOCGIFNAME, &ifr);
123 static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
129 strcpy(ifr.ifr_name, basedev);
130 ifr.ifr_ifru.ifru_data = (void*)p;
131 fd = socket(AF_INET, SOCK_DGRAM, 0);
132 err = ioctl(fd, SIOCGETTUNNEL, &ifr);
139 static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
145 strcpy(ifr.ifr_name, basedev);
146 ifr.ifr_ifru.ifru_data = (void*)p;
147 fd = socket(AF_INET, SOCK_DGRAM, 0);
148 err = ioctl(fd, cmd, &ifr);
155 static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
161 strcpy(ifr.ifr_name, basedev);
162 ifr.ifr_ifru.ifru_data = (void*)p;
163 fd = socket(AF_INET, SOCK_DGRAM, 0);
164 err = ioctl(fd, SIOCDELTUNNEL, &ifr);
171 static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)
173 char medium[IFNAMSIZ];
175 memset(p, 0, sizeof(*p));
176 memset(&medium, 0, sizeof(medium));
181 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
183 p->iph.frag_off = htons(IP_DF);
186 if (strcmp(*argv, "mode") == 0) {
188 if (strcmp(*argv, "ipip") == 0) {
191 p->iph.protocol = IPPROTO_IPIP;
192 } else if (strcmp(*argv, "gre") == 0) {
195 p->iph.protocol = IPPROTO_GRE;
196 } else if (strcmp(*argv, "sit") == 0) {
199 p->iph.protocol = IPPROTO_IPV6;
202 } else if (strcmp(*argv, "key") == 0) {
205 p->i_flags |= GRE_KEY;
206 p->o_flags |= GRE_KEY;
207 if (strchr(*argv, '.'))
208 p->i_key = p->o_key = get_addr32(*argv);
210 if (scan_number(*argv, &uval)<0)
212 p->i_key = p->o_key = htonl(uval);
214 } else if (strcmp(*argv, "ikey") == 0) {
217 p->i_flags |= GRE_KEY;
218 if (strchr(*argv, '.'))
219 p->o_key = get_addr32(*argv);
221 if (scan_number(*argv, &uval)<0)
223 p->i_key = htonl(uval);
225 } else if (strcmp(*argv, "okey") == 0) {
228 p->o_flags |= GRE_KEY;
229 if (strchr(*argv, '.'))
230 p->o_key = get_addr32(*argv);
232 if (scan_number(*argv, &uval)<0)
234 p->o_key = htonl(uval);
236 } else if (strcmp(*argv, "seq") == 0) {
237 p->i_flags |= GRE_SEQ;
238 p->o_flags |= GRE_SEQ;
239 } else if (strcmp(*argv, "iseq") == 0) {
240 p->i_flags |= GRE_SEQ;
241 } else if (strcmp(*argv, "oseq") == 0) {
242 p->o_flags |= GRE_SEQ;
243 } else if (strcmp(*argv, "csum") == 0) {
244 p->i_flags |= GRE_CSUM;
245 p->o_flags |= GRE_CSUM;
246 } else if (strcmp(*argv, "icsum") == 0) {
247 p->i_flags |= GRE_CSUM;
248 } else if (strcmp(*argv, "ocsum") == 0) {
249 p->o_flags |= GRE_CSUM;
250 } else if (strcmp(*argv, "nopmtudisc") == 0) {
252 } else if (strcmp(*argv, "remote") == 0) {
254 if (strcmp(*argv, "any"))
255 p->iph.daddr = get_addr32(*argv);
256 } else if (strcmp(*argv, "local") == 0) {
258 if (strcmp(*argv, "any"))
259 p->iph.saddr = get_addr32(*argv);
260 } else if (strcmp(*argv, "dev") == 0) {
262 strncpy(medium, *argv, IFNAMSIZ-1);
263 } else if (strcmp(*argv, "ttl") == 0) {
266 if (strcmp(*argv, "inherit") != 0) {
267 if (scan_number(*argv, &uval)<0)
273 } else if (strcmp(*argv, "tos") == 0) {
276 if (strcmp(*argv, "inherit") != 0) {
277 if (scan_number(*argv, &uval)<0)
287 strncpy(p->name, *argv, IFNAMSIZ);
292 if (p->iph.protocol == 0) {
293 if (memcmp(p->name, "gre", 3) == 0)
294 p->iph.protocol = IPPROTO_GRE;
295 else if (memcmp(p->name, "ipip", 4) == 0)
296 p->iph.protocol = IPPROTO_IPIP;
297 else if (memcmp(p->name, "sit", 3) == 0)
298 p->iph.protocol = IPPROTO_IPV6;
301 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
302 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
303 fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
309 p->link = do_ioctl_get_ifindex(medium);
314 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
315 p->i_key = p->iph.daddr;
316 p->i_flags |= GRE_KEY;
318 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
319 p->o_key = p->iph.daddr;
320 p->o_flags |= GRE_KEY;
322 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
323 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
330 static int do_add(int cmd, int argc, char **argv)
332 struct ip_tunnel_parm p;
334 if (parse_args(argc, argv, &p) < 0)
337 if (p.iph.ttl && p.iph.frag_off == 0) {
338 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
342 switch (p.iph.protocol) {
344 return do_add_ioctl(cmd, "tunl0", &p);
346 return do_add_ioctl(cmd, "gre0", &p);
348 return do_add_ioctl(cmd, "sit0", &p);
350 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
356 int do_del(int argc, char **argv)
358 struct ip_tunnel_parm p;
360 if (parse_args(argc, argv, &p) < 0)
363 switch (p.iph.protocol) {
365 return do_del_ioctl(p.name[0] ? p.name : "tunl0", &p);
367 return do_del_ioctl(p.name[0] ? p.name : "gre0", &p);
369 return do_del_ioctl(p.name[0] ? p.name : "sit0", &p);
371 return do_del_ioctl(p.name, &p);
376 void print_tunnel(struct ip_tunnel_parm *p)
383 format_host(AF_INET, &p->iph.daddr, s1, sizeof(s1));
384 format_host(AF_INET, &p->iph.saddr, s2, sizeof(s2));
385 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
386 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
388 printf("%s: %s/ip remote %s local %s ",
390 p->iph.protocol == IPPROTO_IPIP ? "ip" :
391 (p->iph.protocol == IPPROTO_GRE ? "gre" :
392 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
393 p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
395 char *n = do_ioctl_get_ifname(p->link);
397 printf(" dev %s ", n);
400 printf(" ttl %d ", p->iph.ttl);
402 printf(" ttl inherit ");
408 printf("%c%02x ", p->iph.tos&1 ? '/' : ' ', p->iph.tos&~1);
410 if (!(p->iph.frag_off&htons(IP_DF)))
411 printf(" nopmtudisc");
413 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
414 printf(" key %s", s3);
415 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
416 if (p->i_flags&GRE_KEY)
417 printf(" ikey %s ", s3);
418 if (p->o_flags&GRE_KEY)
419 printf(" okey %s ", s4);
423 if (p->i_flags&GRE_SEQ)
424 printf(" Drop packets out of sequence.\n");
425 if (p->i_flags&GRE_CSUM)
426 printf(" Checksum in received packet is required.\n");
427 if (p->o_flags&GRE_SEQ)
428 printf(" Sequence packets on output.\n");
429 if (p->o_flags&GRE_CSUM)
430 printf(" Checksum output packets.\n");
433 static int do_tunnels_list(struct ip_tunnel_parm *p)
436 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
438 tx_bytes, tx_packets, tx_errs, tx_drops,
439 tx_fifo, tx_colls, tx_carrier, rx_multi;
441 struct ip_tunnel_parm p1;
444 FILE *fp = fopen("/proc/net/dev", "r");
450 fgets(buf, sizeof(buf), fp);
451 fgets(buf, sizeof(buf), fp);
453 while (fgets(buf, sizeof(buf), fp) != NULL) {
455 buf[sizeof(buf) - 1] = 0;
456 if ((ptr = strchr(buf, ':')) == NULL ||
457 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
458 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
461 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
462 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
463 &rx_fifo, &rx_frame, &rx_multi,
464 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
465 &tx_fifo, &tx_colls, &tx_carrier) != 14)
467 if (p->name[0] && strcmp(p->name, name))
469 type = do_ioctl_get_iftype(name);
471 fprintf(stderr, "Failed to get type of [%s]\n", name);
474 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
476 memset(&p1, 0, sizeof(p1));
477 if (do_get_ioctl(name, &p1))
479 if ((p->link && p1.link != p->link) ||
480 (p->name[0] && strcmp(p1.name, p->name)) ||
481 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
482 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
483 (p->i_key && p1.i_key != p->i_key))
487 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts\n");
488 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld\n",
489 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi);
490 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs\n");
491 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld\n\n",
492 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
498 static int do_show(int argc, char **argv)
501 struct ip_tunnel_parm p;
503 if (parse_args(argc, argv, &p) < 0)
506 switch (p.iph.protocol) {
508 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
511 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
514 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
527 int do_iptunnel(int argc, char **argv)
530 if (matches(*argv, "add") == 0)
531 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
532 if (matches(*argv, "change") == 0)
533 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
534 if (matches(*argv, "del") == 0)
535 return do_del(argc-1, argv+1);
536 if (matches(*argv, "show") == 0 ||
537 matches(*argv, "lst") == 0 ||
538 matches(*argv, "list") == 0)
539 return do_show(argc-1, argv+1);
541 return do_show(0, NULL);
547 int preferred_family = AF_UNSPEC;
549 int resolve_hosts = 0;
551 int main(int argc, char **argv)
555 basename = strrchr(argv[0], '/');
556 if (basename == NULL)
562 if (argv[1][0] != '-')
564 if (matches(argv[1], "-family") == 0) {
569 if (strcmp(argv[1], "inet") == 0)
570 preferred_family = AF_INET;
571 else if (strcmp(argv[1], "inet6") == 0)
572 preferred_family = AF_INET6;
575 } else if (matches(argv[1], "-stats") == 0 ||
576 matches(argv[1], "-statistics") == 0) {
578 } else if (matches(argv[1], "-resolve") == 0) {
585 return do_iptunnel(argc-1, argv+1);