1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
10 * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
11 * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
14 #include <netinet/ip.h>
16 #include <net/if_arp.h>
17 #include <asm/types.h>
19 #ifndef __constant_htons
20 #define __constant_htons htons
23 // FYI: #define SIOCDEVPRIVATE 0x89F0
25 /* From linux/if_tunnel.h. #including it proved troublesome
26 * (redefiniton errors due to name collisions in linux/ and net[inet]/) */
27 #define SIOCGETTUNNEL (SIOCDEVPRIVATE + 0)
28 #define SIOCADDTUNNEL (SIOCDEVPRIVATE + 1)
29 #define SIOCDELTUNNEL (SIOCDEVPRIVATE + 2)
30 #define SIOCCHGTUNNEL (SIOCDEVPRIVATE + 3)
31 //#define SIOCGETPRL (SIOCDEVPRIVATE + 4)
32 //#define SIOCADDPRL (SIOCDEVPRIVATE + 5)
33 //#define SIOCDELPRL (SIOCDEVPRIVATE + 6)
34 //#define SIOCCHGPRL (SIOCDEVPRIVATE + 7)
35 #define GRE_CSUM __constant_htons(0x8000)
36 //#define GRE_ROUTING __constant_htons(0x4000)
37 #define GRE_KEY __constant_htons(0x2000)
38 #define GRE_SEQ __constant_htons(0x1000)
39 //#define GRE_STRICT __constant_htons(0x0800)
40 //#define GRE_REC __constant_htons(0x0700)
41 //#define GRE_FLAGS __constant_htons(0x00F8)
42 //#define GRE_VERSION __constant_htons(0x0007)
43 struct ip_tunnel_parm {
52 /* SIT-mode i_flags */
53 //#define SIT_ISATAP 0x0001
54 //struct ip_tunnel_prl {
57 // uint16_t __reserved;
59 // uint32_t __reserved2;
63 //#define PRL_DEFAULT 0x0001
65 #include "ip_common.h" /* #include "libbb.h" is inside */
71 static int do_ioctl_get_ifindex(char *dev)
76 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
77 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
78 xioctl(fd, SIOCGIFINDEX, &ifr);
80 return ifr.ifr_ifindex;
83 static int do_ioctl_get_iftype(char *dev)
89 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
90 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
91 err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
93 return err ? -1 : ifr.ifr_addr.sa_family;
96 static char *do_ioctl_get_ifname(int idx)
102 ifr.ifr_ifindex = idx;
103 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
104 err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
106 return err ? NULL : xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
109 static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
115 strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
116 ifr.ifr_ifru.ifru_data = (void*)p;
117 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
118 err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
123 /* Dies on error, otherwise returns 0 */
124 static int do_add_ioctl(int cmd, const char *basedev, struct ip_tunnel_parm *p)
129 if (cmd == SIOCCHGTUNNEL && p->name[0]) {
130 strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
132 strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
134 ifr.ifr_ifru.ifru_data = (void*)p;
135 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
136 #if ENABLE_IOCTL_HEX2STR_ERROR
137 /* #define magic will turn ioctl# into string */
138 if (cmd == SIOCCHGTUNNEL)
139 xioctl(fd, SIOCCHGTUNNEL, &ifr);
141 xioctl(fd, SIOCADDTUNNEL, &ifr);
143 xioctl(fd, cmd, &ifr);
149 /* Dies on error, otherwise returns 0 */
150 static int do_del_ioctl(const char *basedev, struct ip_tunnel_parm *p)
156 strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
158 strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
160 ifr.ifr_ifru.ifru_data = (void*)p;
161 fd = xsocket(AF_INET, SOCK_DGRAM, 0);
162 xioctl(fd, SIOCDELTUNNEL, &ifr);
168 static void parse_args(char **argv, int cmd, struct ip_tunnel_parm *p)
170 static const char keywords[] ALIGN1 =
171 "mode\0""ipip\0""ip/ip\0""gre\0""gre/ip\0""sit\0""ipv6/ip\0"
172 "key\0""ikey\0""okey\0""seq\0""iseq\0""oseq\0"
173 "csum\0""icsum\0""ocsum\0""nopmtudisc\0""pmtudisc\0"
174 "remote\0""any\0""local\0""dev\0"
175 "ttl\0""inherit\0""tos\0""dsfield\0"
178 ARG_mode, ARG_ipip, ARG_ip_ip, ARG_gre, ARG_gre_ip, ARG_sit, ARG_ip6_ip,
179 ARG_key, ARG_ikey, ARG_okey, ARG_seq, ARG_iseq, ARG_oseq,
180 ARG_csum, ARG_icsum, ARG_ocsum, ARG_nopmtudisc, ARG_pmtudisc,
181 ARG_remote, ARG_any, ARG_local, ARG_dev,
182 ARG_ttl, ARG_inherit, ARG_tos, ARG_dsfield,
186 char medium[IFNAMSIZ];
189 memset(p, 0, sizeof(*p));
195 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
197 p->iph.frag_off = htons(IP_DF);
200 key = index_in_strings(keywords, *argv);
201 if (key == ARG_mode) {
203 key = index_in_strings(keywords, *argv);
204 if (key == ARG_ipip ||
207 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
208 bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
210 p->iph.protocol = IPPROTO_IPIP;
211 } else if (key == ARG_gre ||
214 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
215 bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
217 p->iph.protocol = IPPROTO_GRE;
218 } else if (key == ARG_sit ||
221 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
222 bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
224 p->iph.protocol = IPPROTO_IPV6;
226 bb_error_msg_and_die("%s tunnel mode", "can't guess");
228 } else if (key == ARG_key) {
231 p->i_flags |= GRE_KEY;
232 p->o_flags |= GRE_KEY;
233 if (strchr(*argv, '.'))
234 p->i_key = p->o_key = get_addr32(*argv);
236 uval = get_unsigned(*argv, "key");
237 p->i_key = p->o_key = htonl(uval);
239 } else if (key == ARG_ikey) {
242 p->i_flags |= GRE_KEY;
243 if (strchr(*argv, '.'))
244 p->o_key = get_addr32(*argv);
246 uval = get_unsigned(*argv, "ikey");
247 p->i_key = htonl(uval);
249 } else if (key == ARG_okey) {
252 p->o_flags |= GRE_KEY;
253 if (strchr(*argv, '.'))
254 p->o_key = get_addr32(*argv);
256 uval = get_unsigned(*argv, "okey");
257 p->o_key = htonl(uval);
259 } else if (key == ARG_seq) {
260 p->i_flags |= GRE_SEQ;
261 p->o_flags |= GRE_SEQ;
262 } else if (key == ARG_iseq) {
263 p->i_flags |= GRE_SEQ;
264 } else if (key == ARG_oseq) {
265 p->o_flags |= GRE_SEQ;
266 } else if (key == ARG_csum) {
267 p->i_flags |= GRE_CSUM;
268 p->o_flags |= GRE_CSUM;
269 } else if (key == ARG_icsum) {
270 p->i_flags |= GRE_CSUM;
271 } else if (key == ARG_ocsum) {
272 p->o_flags |= GRE_CSUM;
273 } else if (key == ARG_nopmtudisc) {
275 } else if (key == ARG_pmtudisc) {
276 p->iph.frag_off = htons(IP_DF);
277 } else if (key == ARG_remote) {
279 key = index_in_strings(keywords, *argv);
281 p->iph.daddr = get_addr32(*argv);
282 } else if (key == ARG_local) {
284 key = index_in_strings(keywords, *argv);
286 p->iph.saddr = get_addr32(*argv);
287 } else if (key == ARG_dev) {
289 strncpy_IFNAMSIZ(medium, *argv);
290 } else if (key == ARG_ttl) {
293 key = index_in_strings(keywords, *argv);
294 if (key != ARG_inherit) {
295 uval = get_unsigned(*argv, "TTL");
297 invarg(*argv, "TTL must be <=255");
300 } else if (key == ARG_tos ||
305 key = index_in_strings(keywords, *argv);
306 if (key != ARG_inherit) {
307 if (rtnl_dsfield_a2n(&uval, *argv))
308 invarg(*argv, "TOS");
313 if (key == ARG_name) {
317 duparg2("name", *argv);
318 strncpy_IFNAMSIZ(p->name, *argv);
319 if (cmd == SIOCCHGTUNNEL && count == 0) {
320 struct ip_tunnel_parm old_p;
321 memset(&old_p, 0, sizeof(old_p));
322 if (do_get_ioctl(*argv, &old_p))
331 if (p->iph.protocol == 0) {
332 if (memcmp(p->name, "gre", 3) == 0)
333 p->iph.protocol = IPPROTO_GRE;
334 else if (memcmp(p->name, "ipip", 4) == 0)
335 p->iph.protocol = IPPROTO_IPIP;
336 else if (memcmp(p->name, "sit", 3) == 0)
337 p->iph.protocol = IPPROTO_IPV6;
340 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
341 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
342 bb_error_msg_and_die("keys are not allowed with ipip and sit");
347 p->link = do_ioctl_get_ifindex(medium);
350 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
351 p->i_key = p->iph.daddr;
352 p->i_flags |= GRE_KEY;
354 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
355 p->o_key = p->iph.daddr;
356 p->o_flags |= GRE_KEY;
358 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
359 bb_error_msg_and_die("broadcast tunnel requires a source address");
363 /* Return value becomes exitcode. It's okay to not return at all */
364 static int do_add(int cmd, char **argv)
366 struct ip_tunnel_parm p;
368 parse_args(argv, cmd, &p);
370 if (p.iph.ttl && p.iph.frag_off == 0) {
371 bb_error_msg_and_die("ttl != 0 and noptmudisc are incompatible");
374 switch (p.iph.protocol) {
376 return do_add_ioctl(cmd, "tunl0", &p);
378 return do_add_ioctl(cmd, "gre0", &p);
380 return do_add_ioctl(cmd, "sit0", &p);
382 bb_error_msg_and_die("can't determine tunnel mode (ipip, gre or sit)");
386 /* Return value becomes exitcode. It's okay to not return at all */
387 static int do_del(char **argv)
389 struct ip_tunnel_parm p;
391 parse_args(argv, SIOCDELTUNNEL, &p);
393 switch (p.iph.protocol) {
395 return do_del_ioctl("tunl0", &p);
397 return do_del_ioctl("gre0", &p);
399 return do_del_ioctl("sit0", &p);
401 return do_del_ioctl(p.name, &p);
405 static void print_tunnel(struct ip_tunnel_parm *p)
412 format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1));
413 format_host(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2));
414 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
415 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
417 printf("%s: %s/ip remote %s local %s ",
419 p->iph.protocol == IPPROTO_IPIP ? "ip" :
420 (p->iph.protocol == IPPROTO_GRE ? "gre" :
421 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
422 p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
424 char *n = do_ioctl_get_ifname(p->link);
426 printf(" dev %s ", n);
431 printf(" ttl %d ", p->iph.ttl);
433 printf(" ttl inherit ");
439 printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
440 rtnl_dsfield_n2a(p->iph.tos & ~1));
442 if (!(p->iph.frag_off & htons(IP_DF)))
443 printf(" nopmtudisc");
445 if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
446 printf(" key %s", s3);
447 else if ((p->i_flags | p->o_flags) & GRE_KEY) {
448 if (p->i_flags & GRE_KEY)
449 printf(" ikey %s ", s3);
450 if (p->o_flags & GRE_KEY)
451 printf(" okey %s ", s4);
454 if (p->i_flags & GRE_SEQ)
455 printf("%c Drop packets out of sequence.\n", _SL_);
456 if (p->i_flags & GRE_CSUM)
457 printf("%c Checksum in received packet is required.", _SL_);
458 if (p->o_flags & GRE_SEQ)
459 printf("%c Sequence packets on output.", _SL_);
460 if (p->o_flags & GRE_CSUM)
461 printf("%c Checksum output packets.", _SL_);
464 static void do_tunnels_list(struct ip_tunnel_parm *p)
467 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
469 tx_bytes, tx_packets, tx_errs, tx_drops,
470 tx_fifo, tx_colls, tx_carrier, rx_multi;
472 struct ip_tunnel_parm p1;
474 FILE *fp = fopen_or_warn("/proc/net/dev", "r");
480 fgets(buf, sizeof(buf), fp);
481 fgets(buf, sizeof(buf), fp);
483 while (fgets(buf, sizeof(buf), fp) != NULL) {
486 /*buf[sizeof(buf) - 1] = 0; - fgets is safe anyway */
487 ptr = strchr(buf, ':');
489 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)
491 bb_error_msg("wrong format of /proc/net/dev");
494 if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
495 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
496 &rx_fifo, &rx_frame, &rx_multi,
497 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
498 &tx_fifo, &tx_colls, &tx_carrier) != 14)
500 if (p->name[0] && strcmp(p->name, name))
502 type = do_ioctl_get_iftype(name);
504 bb_error_msg("can't get type of [%s]", name);
507 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
509 memset(&p1, 0, sizeof(p1));
510 if (do_get_ioctl(name, &p1))
512 if ((p->link && p1.link != p->link) ||
513 (p->name[0] && strcmp(p1.name, p->name)) ||
514 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
515 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
516 (p->i_key && p1.i_key != p->i_key)
525 /* Return value becomes exitcode. It's okay to not return at all */
526 static int do_show(char **argv)
529 struct ip_tunnel_parm p;
531 parse_args(argv, SIOCGETTUNNEL, &p);
533 switch (p.iph.protocol) {
535 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
538 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
541 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
555 /* Return value becomes exitcode. It's okay to not return at all */
556 int FAST_FUNC do_iptunnel(char **argv)
558 static const char keywords[] ALIGN1 =
559 "add\0""change\0""delete\0""show\0""list\0""lst\0";
560 enum { ARG_add = 0, ARG_change, ARG_del, ARG_show, ARG_list, ARG_lst };
563 int key = index_in_substrings(keywords, *argv);
565 invarg(*argv, applet_name);
568 return do_add(SIOCADDTUNNEL, argv);
569 if (key == ARG_change)
570 return do_add(SIOCCHGTUNNEL, argv);
574 return do_show(argv);