source: MondoRescue/branches/2.2.5/mindi-busybox/networking/libiproute/iptunnel.c@ 1772

Last change on this file since 1772 was 1772, checked in by Bruno Cornec, 16 years ago

Update mindi-busybox to 1.7.3
File size: 13.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * iptunnel.c "ip tunnel"
4 *
5 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
6 *
7 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8 *
9 *
10 * Changes:
11 *
12 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
13 * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
14 * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
15 */
16
17#include <netinet/ip.h>
18#include <net/if.h>
19#include <net/if_arp.h>
20#include <asm/types.h>
21#ifndef __constant_htons
22#define __constant_htons htons
23#endif
24#include <linux/if_tunnel.h>
25
26#include "ip_common.h" /* #include "libbb.h" is inside */
27#include "rt_names.h"
28#include "utils.h"
29
30
31/* Dies on error */
32static int do_ioctl_get_ifindex(char *dev)
33{
34 struct ifreq ifr;
35 int fd;
36
37 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
38 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
39 xioctl(fd, SIOCGIFINDEX, &ifr);
40 close(fd);
41 return ifr.ifr_ifindex;
42}
43
44static int do_ioctl_get_iftype(char *dev)
45{
46 struct ifreq ifr;
47 int fd;
48 int err;
49
50 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
51 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
52 err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
53 close(fd);
54 return err ? -1 : ifr.ifr_addr.sa_family;
55}
56
57static char *do_ioctl_get_ifname(int idx)
58{
59 struct ifreq ifr;
60 int fd;
61 int err;
62
63 ifr.ifr_ifindex = idx;
64 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
65 err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
66 close(fd);
67 return err ? NULL : xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
68}
69
70static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
71{
72 struct ifreq ifr;
73 int fd;
74 int err;
75
76 strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
77 ifr.ifr_ifru.ifru_data = (void*)p;
78 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
79 err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
80 close(fd);
81 return err;
82}
83
84/* Dies on error, otherwise returns 0 */
85static int do_add_ioctl(int cmd, const char *basedev, struct ip_tunnel_parm *p)
86{
87 struct ifreq ifr;
88 int fd;
89
90 if (cmd == SIOCCHGTUNNEL && p->name[0]) {
91 strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
92 } else {
93 strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
94 }
95 ifr.ifr_ifru.ifru_data = (void*)p;
96 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
97#if ENABLE_IOCTL_HEX2STR_ERROR
98 /* #define magic will turn ioctl# into string */
99 if (cmd == SIOCCHGTUNNEL)
100 xioctl(fd, SIOCCHGTUNNEL, &ifr);
101 else
102 xioctl(fd, SIOCADDTUNNEL, &ifr);
103#else
104 xioctl(fd, cmd, &ifr);
105#endif
106 close(fd);
107 return 0;
108}
109
110/* Dies on error, otherwise returns 0 */
111static int do_del_ioctl(const char *basedev, struct ip_tunnel_parm *p)
112{
113 struct ifreq ifr;
114 int fd;
115
116 if (p->name[0]) {
117 strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
118 } else {
119 strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
120 }
121 ifr.ifr_ifru.ifru_data = (void*)p;
122 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
123 xioctl(fd, SIOCDELTUNNEL, &ifr);
124 close(fd);
125 return 0;
126}
127
128/* Dies on error */
129static void parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
130{
131 static const char keywords[] ALIGN1 =
132 "mode\0""ipip\0""ip/ip\0""gre\0""gre/ip\0""sit\0""ipv6/ip\0"
133 "key\0""ikey\0""okey\0""seq\0""iseq\0""oseq\0"
134 "csum\0""icsum\0""ocsum\0""nopmtudisc\0""pmtudisc\0"
135 "remote\0""any\0""local\0""dev\0"
136 "ttl\0""inherit\0""tos\0""dsfield\0"
137 "name\0";
138 enum {
139 ARG_mode, ARG_ipip, ARG_ip_ip, ARG_gre, ARG_gre_ip, ARG_sit, ARG_ip6_ip,
140 ARG_key, ARG_ikey, ARG_okey, ARG_seq, ARG_iseq, ARG_oseq,
141 ARG_csum, ARG_icsum, ARG_ocsum, ARG_nopmtudisc, ARG_pmtudisc,
142 ARG_remote, ARG_any, ARG_local, ARG_dev,
143 ARG_ttl, ARG_inherit, ARG_tos, ARG_dsfield,
144 ARG_name
145 };
146 int count = 0;
147 char medium[IFNAMSIZ];
148 int key;
149
150 memset(p, 0, sizeof(*p));
151 memset(&medium, 0, sizeof(medium));
152
153 p->iph.version = 4;
154 p->iph.ihl = 5;
155#ifndef IP_DF
156#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
157#endif
158 p->iph.frag_off = htons(IP_DF);
159
160 while (argc > 0) {
161 key = index_in_strings(keywords, *argv);
162 if (key == ARG_mode) {
163 NEXT_ARG();
164 key = index_in_strings(keywords, *argv);
165 if (key == ARG_ipip ||
166 key == ARG_ip_ip) {
167 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
168 bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
169 }
170 p->iph.protocol = IPPROTO_IPIP;
171 } else if (key == ARG_gre ||
172 key == ARG_gre_ip) {
173 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
174 bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
175 }
176 p->iph.protocol = IPPROTO_GRE;
177 } else if (key == ARG_sit ||
178 key == ARG_ip6_ip) {
179 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
180 bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
181 }
182 p->iph.protocol = IPPROTO_IPV6;
183 } else {
184 bb_error_msg_and_die("cannot guess tunnel mode");
185 }
186 } else if (key == ARG_key) {
187 unsigned uval;
188 NEXT_ARG();
189 p->i_flags |= GRE_KEY;
190 p->o_flags |= GRE_KEY;
191 if (strchr(*argv, '.'))
192 p->i_key = p->o_key = get_addr32(*argv);
193 else {
194 if (get_unsigned(&uval, *argv, 0)<0) {
195 bb_error_msg_and_die("invalid value of \"key\"");
196 }
197 p->i_key = p->o_key = htonl(uval);
198 }
199 } else if (key == ARG_ikey) {
200 unsigned uval;
201 NEXT_ARG();
202 p->i_flags |= GRE_KEY;
203 if (strchr(*argv, '.'))
204 p->o_key = get_addr32(*argv);
205 else {
206 if (get_unsigned(&uval, *argv, 0)<0) {
207 bb_error_msg_and_die("invalid value of \"ikey\"");
208 }
209 p->i_key = htonl(uval);
210 }
211 } else if (key == ARG_okey) {
212 unsigned uval;
213 NEXT_ARG();
214 p->o_flags |= GRE_KEY;
215 if (strchr(*argv, '.'))
216 p->o_key = get_addr32(*argv);
217 else {
218 if (get_unsigned(&uval, *argv, 0)<0) {
219 bb_error_msg_and_die("invalid value of \"okey\"");
220 }
221 p->o_key = htonl(uval);
222 }
223 } else if (key == ARG_seq) {
224 p->i_flags |= GRE_SEQ;
225 p->o_flags |= GRE_SEQ;
226 } else if (key == ARG_iseq) {
227 p->i_flags |= GRE_SEQ;
228 } else if (key == ARG_oseq) {
229 p->o_flags |= GRE_SEQ;
230 } else if (key == ARG_csum) {
231 p->i_flags |= GRE_CSUM;
232 p->o_flags |= GRE_CSUM;
233 } else if (key == ARG_icsum) {
234 p->i_flags |= GRE_CSUM;
235 } else if (key == ARG_ocsum) {
236 p->o_flags |= GRE_CSUM;
237 } else if (key == ARG_nopmtudisc) {
238 p->iph.frag_off = 0;
239 } else if (key == ARG_pmtudisc) {
240 p->iph.frag_off = htons(IP_DF);
241 } else if (key == ARG_remote) {
242 NEXT_ARG();
243 key = index_in_strings(keywords, *argv);
244 if (key != ARG_any)
245 p->iph.daddr = get_addr32(*argv);
246 } else if (key == ARG_local) {
247 NEXT_ARG();
248 key = index_in_strings(keywords, *argv);
249 if (key != ARG_any)
250 p->iph.saddr = get_addr32(*argv);
251 } else if (key == ARG_dev) {
252 NEXT_ARG();
253 strncpy(medium, *argv, IFNAMSIZ-1);
254 } else if (key == ARG_ttl) {
255 unsigned uval;
256 NEXT_ARG();
257 key = index_in_strings(keywords, *argv);
258 if (key != ARG_inherit) {
259 if (get_unsigned(&uval, *argv, 0))
260 invarg(*argv, "TTL");
261 if (uval > 255)
262 invarg(*argv, "TTL must be <=255");
263 p->iph.ttl = uval;
264 }
265 } else if (key == ARG_tos ||
266 key == ARG_dsfield) {
267 uint32_t uval;
268 NEXT_ARG();
269 key = index_in_strings(keywords, *argv);
270 if (key != ARG_inherit) {
271 if (rtnl_dsfield_a2n(&uval, *argv))
272 invarg(*argv, "TOS");
273 p->iph.tos = uval;
274 } else
275 p->iph.tos = 1;
276 } else {
277 if (key == ARG_name) {
278 NEXT_ARG();
279 }
280 if (p->name[0])
281 duparg2("name", *argv);
282 strncpy(p->name, *argv, IFNAMSIZ);
283 if (cmd == SIOCCHGTUNNEL && count == 0) {
284 struct ip_tunnel_parm old_p;
285 memset(&old_p, 0, sizeof(old_p));
286 if (do_get_ioctl(*argv, &old_p))
287 exit(1);
288 *p = old_p;
289 }
290 }
291 count++;
292 argc--;
293 argv++;
294 }
295
296 if (p->iph.protocol == 0) {
297 if (memcmp(p->name, "gre", 3) == 0)
298 p->iph.protocol = IPPROTO_GRE;
299 else if (memcmp(p->name, "ipip", 4) == 0)
300 p->iph.protocol = IPPROTO_IPIP;
301 else if (memcmp(p->name, "sit", 3) == 0)
302 p->iph.protocol = IPPROTO_IPV6;
303 }
304
305 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
306 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
307 bb_error_msg_and_die("keys are not allowed with ipip and sit");
308 }
309 }
310
311 if (medium[0]) {
312 p->link = do_ioctl_get_ifindex(medium);
313 }
314
315 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
316 p->i_key = p->iph.daddr;
317 p->i_flags |= GRE_KEY;
318 }
319 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
320 p->o_key = p->iph.daddr;
321 p->o_flags |= GRE_KEY;
322 }
323 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
324 bb_error_msg_and_die("broadcast tunnel requires a source address");
325 }
326}
327
328
329/* Return value becomes exitcode. It's okay to not return at all */
330static int do_add(int cmd, int argc, char **argv)
331{
332 struct ip_tunnel_parm p;
333
334 parse_args(argc, argv, cmd, &p);
335
336 if (p.iph.ttl && p.iph.frag_off == 0) {
337 bb_error_msg_and_die("ttl != 0 and noptmudisc are incompatible");
338 }
339
340 switch (p.iph.protocol) {
341 case IPPROTO_IPIP:
342 return do_add_ioctl(cmd, "tunl0", &p);
343 case IPPROTO_GRE:
344 return do_add_ioctl(cmd, "gre0", &p);
345 case IPPROTO_IPV6:
346 return do_add_ioctl(cmd, "sit0", &p);
347 default:
348 bb_error_msg_and_die("cannot determine tunnel mode (ipip, gre or sit)");
349 }
350}
351
352/* Return value becomes exitcode. It's okay to not return at all */
353static int do_del(int argc, char **argv)
354{
355 struct ip_tunnel_parm p;
356
357 parse_args(argc, argv, SIOCDELTUNNEL, &p);
358
359 switch (p.iph.protocol) {
360 case IPPROTO_IPIP:
361 return do_del_ioctl("tunl0", &p);
362 case IPPROTO_GRE:
363 return do_del_ioctl("gre0", &p);
364 case IPPROTO_IPV6:
365 return do_del_ioctl("sit0", &p);
366 default:
367 return do_del_ioctl(p.name, &p);
368 }
369}
370
371static void print_tunnel(struct ip_tunnel_parm *p)
372{
373 char s1[256];
374 char s2[256];
375 char s3[64];
376 char s4[64];
377
378 format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1));
379 format_host(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2));
380 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
381 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
382
383 printf("%s: %s/ip remote %s local %s ",
384 p->name,
385 p->iph.protocol == IPPROTO_IPIP ? "ip" :
386 (p->iph.protocol == IPPROTO_GRE ? "gre" :
387 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
388 p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
389 if (p->link) {
390 char *n = do_ioctl_get_ifname(p->link);
391 if (n) {
392 printf(" dev %s ", n);
393 free(n);
394 }
395 }
396 if (p->iph.ttl)
397 printf(" ttl %d ", p->iph.ttl);
398 else
399 printf(" ttl inherit ");
400 if (p->iph.tos) {
401 SPRINT_BUF(b1);
402 printf(" tos");
403 if (p->iph.tos & 1)
404 printf(" inherit");
405 if (p->iph.tos & ~1)
406 printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
407 rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
408 }
409 if (!(p->iph.frag_off & htons(IP_DF)))
410 printf(" nopmtudisc");
411
412 if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
413 printf(" key %s", s3);
414 else if ((p->i_flags | p->o_flags) & GRE_KEY) {
415 if (p->i_flags & GRE_KEY)
416 printf(" ikey %s ", s3);
417 if (p->o_flags & GRE_KEY)
418 printf(" okey %s ", s4);
419 }
420
421 if (p->i_flags & GRE_SEQ)
422 printf("%c Drop packets out of sequence.\n", _SL_);
423 if (p->i_flags & GRE_CSUM)
424 printf("%c Checksum in received packet is required.", _SL_);
425 if (p->o_flags & GRE_SEQ)
426 printf("%c Sequence packets on output.", _SL_);
427 if (p->o_flags & GRE_CSUM)
428 printf("%c Checksum output packets.", _SL_);
429}
430
431static void do_tunnels_list(struct ip_tunnel_parm *p)
432{
433 char name[IFNAMSIZ];
434 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
435 rx_fifo, rx_frame,
436 tx_bytes, tx_packets, tx_errs, tx_drops,
437 tx_fifo, tx_colls, tx_carrier, rx_multi;
438 int type;
439 struct ip_tunnel_parm p1;
440 char buf[512];
441 FILE *fp = fopen_or_warn("/proc/net/dev", "r");
442
443 if (fp == NULL) {
444 return;
445 }
446
447 fgets(buf, sizeof(buf), fp);
448 fgets(buf, sizeof(buf), fp);
449
450 while (fgets(buf, sizeof(buf), fp) != NULL) {
451 char *ptr;
452
453 /*buf[sizeof(buf) - 1] = 0; - fgets is safe anyway */
454 ptr = strchr(buf, ':');
455 if (ptr == NULL ||
456 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
457 bb_error_msg("wrong format of /proc/net/dev");
458 return;
459 }
460 if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
461 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
462 &rx_fifo, &rx_frame, &rx_multi,
463 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
464 &tx_fifo, &tx_colls, &tx_carrier) != 14)
465 continue;
466 if (p->name[0] && strcmp(p->name, name))
467 continue;
468 type = do_ioctl_get_iftype(name);
469 if (type == -1) {
470 bb_error_msg("cannot get type of [%s]", name);
471 continue;
472 }
473 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
474 continue;
475 memset(&p1, 0, sizeof(p1));
476 if (do_get_ioctl(name, &p1))
477 continue;
478 if ((p->link && p1.link != p->link) ||
479 (p->name[0] && strcmp(p1.name, p->name)) ||
480 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
481 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
482 (p->i_key && p1.i_key != p->i_key))
483 continue;
484 print_tunnel(&p1);
485 puts("");
486 }
487}
488
489/* Return value becomes exitcode. It's okay to not return at all */
490static int do_show(int argc, char **argv)
491{
492 int err;
493 struct ip_tunnel_parm p;
494
495 parse_args(argc, argv, SIOCGETTUNNEL, &p);
496
497 switch (p.iph.protocol) {
498 case IPPROTO_IPIP:
499 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
500 break;
501 case IPPROTO_GRE:
502 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
503 break;
504 case IPPROTO_IPV6:
505 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
506 break;
507 default:
508 do_tunnels_list(&p);
509 return 0;
510 }
511 if (err)
512 return -1;
513
514 print_tunnel(&p);
515 puts("");
516 return 0;
517}
518
519/* Return value becomes exitcode. It's okay to not return at all */
520int do_iptunnel(int argc, char **argv)
521{
522 static const char keywords[] ALIGN1 =
523 "add\0""change\0""delete\0""show\0""list\0""lst\0";
524 enum { ARG_add = 0, ARG_change, ARG_del, ARG_show, ARG_list, ARG_lst };
525 int key;
526
527 if (argc) {
528 key = index_in_substrings(keywords, *argv);
529 if (key < 0)
530 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
531 --argc;
532 ++argv;
533 if (key == ARG_add)
534 return do_add(SIOCADDTUNNEL, argc, argv);
535 if (key == ARG_change)
536 return do_add(SIOCCHGTUNNEL, argc, argv);
537 if (key == ARG_del)
538 return do_del(argc, argv);
539 }
540 return do_show(argc, argv);
541}
Note: See TracBrowser for help on using the repository browser.