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13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <unistd.h>
17#include <sys/types.h>
18#include <sys/socket.h>
19#include <arpa/inet.h>
20#include <sys/ioctl.h>
21#include <net/if.h>
22#include <net/if_arp.h>
23#include <linux/ip.h>
24#include <linux/if_tunnel.h>
25
26#include "rt_names.h"
27#include "utils.h"
28#include "ip_common.h"
29#include "tunnel.h"
30
31static void usage(void) __attribute__((noreturn));
32
33static void usage(void)
34{
35 fprintf(stderr,
36 "Usage: ip tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n"
37 " [ mode { gre | ipip | isatap | sit | vti } ]\n"
38 " [ remote ADDR ] [ local ADDR ]\n"
39 " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"
40 " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n"
41 " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n"
42 " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"
43 "\n"
44 "Where: NAME := STRING\n"
45 " ADDR := { IP_ADDRESS | any }\n"
46 " TOS := { STRING | 00..ff | inherit | inherit/STRING | inherit/00..ff }\n"
47 " TTL := { 1..255 | inherit }\n"
48 " KEY := { DOTTED_QUAD | NUMBER }\n");
49 exit(-1);
50}
51
52static void set_tunnel_proto(struct ip_tunnel_parm *p, int proto)
53{
54 if (p->iph.protocol && p->iph.protocol != proto) {
55 fprintf(stderr,
56 "You managed to ask for more than one tunnel mode.\n");
57 exit(-1);
58 }
59 p->iph.protocol = proto;
60}
61
62static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
63{
64 int count = 0;
65 const char *medium = NULL;
66 int isatap = 0;
67
68 memset(p, 0, sizeof(*p));
69 p->iph.version = 4;
70 p->iph.ihl = 5;
71#ifndef IP_DF
72#define IP_DF 0x4000
73#endif
74 p->iph.frag_off = htons(IP_DF);
75
76 while (argc > 0) {
77 if (strcmp(*argv, "mode") == 0) {
78 NEXT_ARG();
79 if (strcmp(*argv, "ipip") == 0 ||
80 strcmp(*argv, "ip/ip") == 0) {
81 set_tunnel_proto(p, IPPROTO_IPIP);
82 } else if (strcmp(*argv, "gre") == 0 ||
83 strcmp(*argv, "gre/ip") == 0) {
84 set_tunnel_proto(p, IPPROTO_GRE);
85 } else if (strcmp(*argv, "sit") == 0 ||
86 strcmp(*argv, "ipv6/ip") == 0) {
87 set_tunnel_proto(p, IPPROTO_IPV6);
88 } else if (strcmp(*argv, "isatap") == 0) {
89 set_tunnel_proto(p, IPPROTO_IPV6);
90 isatap++;
91 } else if (strcmp(*argv, "vti") == 0) {
92 set_tunnel_proto(p, IPPROTO_IPIP);
93 p->i_flags |= VTI_ISVTI;
94 } else {
95 fprintf(stderr,
96 "Unknown tunnel mode \"%s\"\n", *argv);
97 exit(-1);
98 }
99 } else if (strcmp(*argv, "key") == 0) {
100 NEXT_ARG();
101 p->i_flags |= GRE_KEY;
102 p->o_flags |= GRE_KEY;
103 p->i_key = p->o_key = tnl_parse_key("key", *argv);
104 } else if (strcmp(*argv, "ikey") == 0) {
105 NEXT_ARG();
106 p->i_flags |= GRE_KEY;
107 p->i_key = tnl_parse_key("ikey", *argv);
108 } else if (strcmp(*argv, "okey") == 0) {
109 NEXT_ARG();
110 p->o_flags |= GRE_KEY;
111 p->o_key = tnl_parse_key("okey", *argv);
112 } else if (strcmp(*argv, "seq") == 0) {
113 p->i_flags |= GRE_SEQ;
114 p->o_flags |= GRE_SEQ;
115 } else if (strcmp(*argv, "iseq") == 0) {
116 p->i_flags |= GRE_SEQ;
117 } else if (strcmp(*argv, "oseq") == 0) {
118 p->o_flags |= GRE_SEQ;
119 } else if (strcmp(*argv, "csum") == 0) {
120 p->i_flags |= GRE_CSUM;
121 p->o_flags |= GRE_CSUM;
122 } else if (strcmp(*argv, "icsum") == 0) {
123 p->i_flags |= GRE_CSUM;
124 } else if (strcmp(*argv, "ocsum") == 0) {
125 p->o_flags |= GRE_CSUM;
126 } else if (strcmp(*argv, "nopmtudisc") == 0) {
127 p->iph.frag_off = 0;
128 } else if (strcmp(*argv, "pmtudisc") == 0) {
129 p->iph.frag_off = htons(IP_DF);
130 } else if (strcmp(*argv, "remote") == 0) {
131 NEXT_ARG();
132 p->iph.daddr = get_addr32(*argv);
133 } else if (strcmp(*argv, "local") == 0) {
134 NEXT_ARG();
135 p->iph.saddr = get_addr32(*argv);
136 } else if (strcmp(*argv, "dev") == 0) {
137 NEXT_ARG();
138 medium = *argv;
139 } else if (strcmp(*argv, "ttl") == 0 ||
140 strcmp(*argv, "hoplimit") == 0 ||
141 strcmp(*argv, "hlim") == 0) {
142 __u8 uval;
143
144 NEXT_ARG();
145 if (strcmp(*argv, "inherit") != 0) {
146 if (get_u8(&uval, *argv, 0))
147 invarg("invalid TTL\n", *argv);
148 p->iph.ttl = uval;
149 }
150 } else if (strcmp(*argv, "tos") == 0 ||
151 strcmp(*argv, "tclass") == 0 ||
152 matches(*argv, "dsfield") == 0) {
153 char *dsfield;
154 __u32 uval;
155
156 NEXT_ARG();
157 dsfield = *argv;
158 strsep(&dsfield, "/");
159 if (strcmp(*argv, "inherit") != 0) {
160 dsfield = *argv;
161 p->iph.tos = 0;
162 } else
163 p->iph.tos = 1;
164 if (dsfield) {
165 if (rtnl_dsfield_a2n(&uval, dsfield))
166 invarg("bad TOS value", *argv);
167 p->iph.tos |= uval;
168 }
169 } else {
170 if (strcmp(*argv, "name") == 0)
171 NEXT_ARG();
172 else if (matches(*argv, "help") == 0)
173 usage();
174
175 if (p->name[0])
176 duparg2("name", *argv);
177 if (get_ifname(p->name, *argv))
178 invarg("\"name\" not a valid ifname", *argv);
179 if (cmd == SIOCCHGTUNNEL && count == 0) {
180 struct ip_tunnel_parm old_p = {};
181
182 if (tnl_get_ioctl(*argv, &old_p))
183 return -1;
184 *p = old_p;
185 }
186 }
187 count++;
188 argc--; argv++;
189 }
190
191
192 if (p->iph.protocol == 0) {
193 if (memcmp(p->name, "gre", 3) == 0)
194 p->iph.protocol = IPPROTO_GRE;
195 else if (memcmp(p->name, "ipip", 4) == 0)
196 p->iph.protocol = IPPROTO_IPIP;
197 else if (memcmp(p->name, "sit", 3) == 0)
198 p->iph.protocol = IPPROTO_IPV6;
199 else if (memcmp(p->name, "isatap", 6) == 0) {
200 p->iph.protocol = IPPROTO_IPV6;
201 isatap++;
202 } else if (memcmp(p->name, "vti", 3) == 0) {
203 p->iph.protocol = IPPROTO_IPIP;
204 p->i_flags |= VTI_ISVTI;
205 }
206 }
207
208 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
209 if (!(p->i_flags & VTI_ISVTI) &&
210 (p->iph.protocol != IPPROTO_GRE)) {
211 fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
212 return -1;
213 }
214 }
215
216 if (medium) {
217 p->link = ll_name_to_index(medium);
218 if (!p->link)
219 return nodev(medium);
220 }
221
222 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
223 p->i_key = p->iph.daddr;
224 p->i_flags |= GRE_KEY;
225 }
226 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
227 p->o_key = p->iph.daddr;
228 p->o_flags |= GRE_KEY;
229 }
230 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
231 fprintf(stderr, "A broadcast tunnel requires a source address\n");
232 return -1;
233 }
234 if (isatap)
235 p->i_flags |= SIT_ISATAP;
236
237 return 0;
238}
239
240static const char *tnl_defname(const struct ip_tunnel_parm *p)
241{
242 switch (p->iph.protocol) {
243 case IPPROTO_IPIP:
244 if (p->i_flags & VTI_ISVTI)
245 return "ip_vti0";
246 else
247 return "tunl0";
248 case IPPROTO_GRE:
249 return "gre0";
250 case IPPROTO_IPV6:
251 return "sit0";
252 }
253 return NULL;
254}
255
256static int do_add(int cmd, int argc, char **argv)
257{
258 struct ip_tunnel_parm p;
259 const char *basedev;
260
261 if (parse_args(argc, argv, cmd, &p) < 0)
262 return -1;
263
264 if (p.iph.ttl && p.iph.frag_off == 0) {
265 fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
266 return -1;
267 }
268
269 basedev = tnl_defname(&p);
270 if (!basedev) {
271 fprintf(stderr,
272 "cannot determine tunnel mode (ipip, gre, vti or sit)\n");
273 return -1;
274 }
275
276 return tnl_add_ioctl(cmd, basedev, p.name, &p);
277}
278
279static int do_del(int argc, char **argv)
280{
281 struct ip_tunnel_parm p;
282
283 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
284 return -1;
285
286 return tnl_del_ioctl(tnl_defname(&p) ? : p.name, p.name, &p);
287}
288
289static void print_tunnel(const void *t)
290{
291 const struct ip_tunnel_parm *p = t;
292 struct ip_tunnel_6rd ip6rd = {};
293 SPRINT_BUF(b1);
294
295
296
297
298 open_json_object(NULL);
299 print_color_string(PRINT_ANY, COLOR_IFNAME, "ifname", "%s: ", p->name);
300 snprintf(b1, sizeof(b1), "%s/ip", tnl_strproto(p->iph.protocol));
301 print_string(PRINT_ANY, "mode", "%s ", b1);
302 print_null(PRINT_FP, NULL, "remote ", NULL);
303 print_color_string(PRINT_ANY, COLOR_INET, "remote", "%s ",
304 p->iph.daddr || is_json_context()
305 ? format_host_r(AF_INET, 4, &p->iph.daddr, b1, sizeof(b1))
306 : "any");
307 print_null(PRINT_FP, NULL, "local ", NULL);
308 print_color_string(PRINT_ANY, COLOR_INET, "local", "%s",
309 p->iph.saddr || is_json_context()
310 ? rt_addr_n2a_r(AF_INET, 4, &p->iph.saddr, b1, sizeof(b1))
311 : "any");
312
313 if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
314 struct ip_tunnel_prl prl[16] = {};
315 int i;
316
317 prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
318 prl[0].addr = htonl(INADDR_ANY);
319
320 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl)) {
321 for (i = 1; i < ARRAY_SIZE(prl); i++) {
322 if (prl[i].addr == htonl(INADDR_ANY))
323 continue;
324 if (prl[i].flags & PRL_DEFAULT)
325 print_string(PRINT_ANY, "pdr",
326 " pdr %s",
327 format_host(AF_INET, 4, &prl[i].addr));
328 else
329 print_string(PRINT_ANY, "pr", " pr %s",
330 format_host(AF_INET, 4, &prl[i].addr));
331 }
332 }
333 }
334
335 if (p->link) {
336 const char *n = ll_index_to_name(p->link);
337
338 if (n)
339 print_string(PRINT_ANY, "dev", " dev %s", n);
340 }
341
342 if (p->iph.ttl)
343 print_uint(PRINT_ANY, "ttl", " ttl %u", p->iph.ttl);
344 else
345 print_string(PRINT_FP, "ttl", " ttl %s", "inherit");
346
347 if (p->iph.tos) {
348 SPRINT_BUF(b2);
349
350 if (p->iph.tos != 1) {
351 if (!is_json_context() && p->iph.tos & 1)
352 snprintf(b2, sizeof(b2), "%s%s",
353 p->iph.tos & 1 ? "inherit/" : "",
354 rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
355 else
356 snprintf(b2, sizeof(b2), "%s",
357 rtnl_dsfield_n2a(p->iph.tos, b1, sizeof(b1)));
358 print_string(PRINT_ANY, "tos", " tos %s", b2);
359 } else {
360 print_string(PRINT_FP, NULL, " tos %s", "inherit");
361 }
362 }
363
364 if (!(p->iph.frag_off & htons(IP_DF)))
365 print_null(PRINT_ANY, "nopmtudisc", " nopmtudisc", NULL);
366
367 if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
368 print_string(PRINT_ANY, "6rd-prefix", " 6rd-prefix %s",
369 inet_ntop(AF_INET6, &ip6rd.prefix, b1, sizeof(b1)));
370 print_uint(PRINT_ANY, "6rd-prefixlen", "/%u", ip6rd.prefixlen);
371 if (ip6rd.relay_prefix) {
372 print_string(PRINT_ANY, "6rd-relay_prefix",
373 " 6rd-relay_prefix %s",
374 format_host(AF_INET, 4, &ip6rd.relay_prefix));
375 print_uint(PRINT_ANY, "6rd-relay_prefixlen", "/%u",
376 ip6rd.relay_prefixlen);
377 }
378 }
379
380 tnl_print_gre_flags(p->iph.protocol, p->i_flags, p->o_flags,
381 p->i_key, p->o_key);
382
383 close_json_object();
384}
385
386
387static void ip_tunnel_parm_initialize(const struct tnl_print_nlmsg_info *info)
388{
389 struct ip_tunnel_parm *p2 = info->p2;
390
391 memset(p2, 0, sizeof(*p2));
392}
393
394static bool ip_tunnel_parm_match(const struct tnl_print_nlmsg_info *info)
395{
396 const struct ip_tunnel_parm *p1 = info->p1;
397 const struct ip_tunnel_parm *p2 = info->p2;
398
399 return ((!p1->link || p1->link == p2->link) &&
400 (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
401 (!p1->iph.daddr || p1->iph.daddr == p2->iph.daddr) &&
402 (!p1->iph.saddr || p1->iph.saddr == p2->iph.saddr) &&
403 (!p1->i_key || p1->i_key == p2->i_key));
404}
405
406static int do_show(int argc, char **argv)
407{
408 struct ip_tunnel_parm p, p1;
409 const char *basedev;
410
411 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
412 return -1;
413
414 basedev = tnl_defname(&p);
415 if (!basedev) {
416 struct tnl_print_nlmsg_info info = {
417 .p1 = &p,
418 .p2 = &p1,
419 .init = ip_tunnel_parm_initialize,
420 .match = ip_tunnel_parm_match,
421 .print = print_tunnel,
422 };
423
424 return do_tunnels_list(&info);
425 }
426
427 if (tnl_get_ioctl(p.name[0] ? p.name : basedev, &p))
428 return -1;
429
430 print_tunnel(&p);
431 fputc('\n', stdout);
432 return 0;
433}
434
435static int do_prl(int argc, char **argv)
436{
437 struct ip_tunnel_prl p = {};
438 int count = 0;
439 int cmd = 0;
440 const char *medium = NULL;
441
442 while (argc > 0) {
443 if (strcmp(*argv, "prl-default") == 0) {
444 NEXT_ARG();
445 cmd = SIOCADDPRL;
446 p.addr = get_addr32(*argv);
447 p.flags |= PRL_DEFAULT;
448 count++;
449 } else if (strcmp(*argv, "prl-nodefault") == 0) {
450 NEXT_ARG();
451 cmd = SIOCADDPRL;
452 p.addr = get_addr32(*argv);
453 count++;
454 } else if (strcmp(*argv, "prl-delete") == 0) {
455 NEXT_ARG();
456 cmd = SIOCDELPRL;
457 p.addr = get_addr32(*argv);
458 count++;
459 } else if (strcmp(*argv, "dev") == 0) {
460 NEXT_ARG();
461 if (check_ifname(*argv))
462 invarg("\"dev\" not a valid ifname", *argv);
463 medium = *argv;
464 } else {
465 fprintf(stderr,
466 "Invalid PRL parameter \"%s\"\n", *argv);
467 exit(-1);
468 }
469 if (count > 1) {
470 fprintf(stderr,
471 "One PRL entry at a time\n");
472 exit(-1);
473 }
474 argc--; argv++;
475 }
476 if (!medium) {
477 fprintf(stderr, "Must specify device\n");
478 exit(-1);
479 }
480
481 return tnl_prl_ioctl(cmd, medium, &p);
482}
483
484static int do_6rd(int argc, char **argv)
485{
486 struct ip_tunnel_6rd ip6rd = {};
487 int cmd = 0;
488 const char *medium = NULL;
489 inet_prefix prefix;
490
491 while (argc > 0) {
492 if (strcmp(*argv, "6rd-prefix") == 0) {
493 NEXT_ARG();
494 if (get_prefix(&prefix, *argv, AF_INET6))
495 invarg("invalid 6rd_prefix\n", *argv);
496 cmd = SIOCADD6RD;
497 memcpy(&ip6rd.prefix, prefix.data, 16);
498 ip6rd.prefixlen = prefix.bitlen;
499 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
500 NEXT_ARG();
501 if (get_prefix(&prefix, *argv, AF_INET))
502 invarg("invalid 6rd-relay_prefix\n", *argv);
503 cmd = SIOCADD6RD;
504 memcpy(&ip6rd.relay_prefix, prefix.data, 4);
505 ip6rd.relay_prefixlen = prefix.bitlen;
506 } else if (strcmp(*argv, "6rd-reset") == 0) {
507 cmd = SIOCDEL6RD;
508 } else if (strcmp(*argv, "dev") == 0) {
509 NEXT_ARG();
510 if (check_ifname(*argv))
511 invarg("\"dev\" not a valid ifname", *argv);
512 medium = *argv;
513 } else {
514 fprintf(stderr,
515 "Invalid 6RD parameter \"%s\"\n", *argv);
516 exit(-1);
517 }
518 argc--; argv++;
519 }
520 if (!medium) {
521 fprintf(stderr, "Must specify device\n");
522 exit(-1);
523 }
524
525 return tnl_6rd_ioctl(cmd, medium, &ip6rd);
526}
527
528static int tunnel_mode_is_ipv6(char *tunnel_mode)
529{
530 static const char * const ipv6_modes[] = {
531 "ipv6/ipv6", "ip6ip6",
532 "vti6",
533 "ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6",
534 "ip6gre", "gre/ipv6",
535 "any/ipv6", "any"
536 };
537 int i;
538
539 for (i = 0; i < ARRAY_SIZE(ipv6_modes); i++) {
540 if (strcmp(ipv6_modes[i], tunnel_mode) == 0)
541 return 1;
542 }
543 return 0;
544}
545
546int do_iptunnel(int argc, char **argv)
547{
548 int i;
549
550 for (i = 0; i < argc - 1; i++) {
551 if (strcmp(argv[i], "mode") == 0) {
552 if (tunnel_mode_is_ipv6(argv[i + 1]))
553 preferred_family = AF_INET6;
554 break;
555 }
556 }
557 switch (preferred_family) {
558 case AF_UNSPEC:
559 preferred_family = AF_INET;
560 break;
561 case AF_INET:
562 break;
563
564
565
566
567
568 case AF_INET6:
569 return do_ip6tunnel(argc, argv);
570 default:
571 fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
572 exit(-1);
573 }
574
575 if (argc > 0) {
576 if (matches(*argv, "add") == 0)
577 return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
578 if (matches(*argv, "change") == 0)
579 return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
580 if (matches(*argv, "delete") == 0)
581 return do_del(argc - 1, argv + 1);
582 if (matches(*argv, "show") == 0 ||
583 matches(*argv, "lst") == 0 ||
584 matches(*argv, "list") == 0)
585 return do_show(argc - 1, argv + 1);
586 if (matches(*argv, "prl") == 0)
587 return do_prl(argc - 1, argv + 1);
588 if (matches(*argv, "6rd") == 0)
589 return do_6rd(argc - 1, argv + 1);
590 if (matches(*argv, "help") == 0)
591 usage();
592 } else
593 return do_show(0, NULL);
594
595 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv);
596 exit(-1);
597}
598
