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 * Bernd Eckenfels 990715: add linux/types.h (not clean but solves missing __u16
25 #include <sys/socket.h>
26 #include <sys/ioctl.h>
27 #include <netinet/in.h>
28 #include <netinet/ip.h>
29 #include <arpa/inet.h>
30 #if defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
32 #include <net/if_arp.h>
35 #include <linux/if_arp.h>
37 #include <linux/types.h>
38 #include <linux/if_tunnel.h>
42 #include "net-support.h"
47 #define GRE_CSUM htons(0x8000)
49 #define GRE_ROUTING htons(0x4000)
51 #define GRE_KEY htons(0x2000)
53 #define GRE_SEQ htons(0x1000)
55 #define GRE_STRICT htons(0x0800)
57 #define GRE_REC htons(0x0700)
59 #define GRE_FLAGS htons(0x00F8)
61 #define GRE_VERSION htons(0x0007)
63 /* Old versions of glibc do not define this */
64 #if __GLIBC__ == 2 && __GLIBC_MINOR__ == 0
65 #define IPPROTO_GRE 47
70 char *Release
= RELEASE
,
71 *Version
= "iptunnel 1.01",
72 *Signature
= "Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>";
74 static void version(void)
76 printf("%s\n%s\n%s\n", Release
, Version
, Signature
);
80 static void usage(void) __attribute__((noreturn
));
82 static void usage(void)
84 fprintf(stderr
, _("Usage: iptunnel { add | change | del | show } [ NAME ]\n"));
85 fprintf(stderr
, _(" [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n"));
86 fprintf(stderr
, _(" [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"));
87 fprintf(stderr
, _(" [ ttl TTL ] [ tos TOS ] [ nopmtudisc ] [ dev PHYS_DEV ]\n"));
88 fprintf(stderr
, _(" iptunnel -V | --version\n\n"));
89 fprintf(stderr
, _("Where: NAME := STRING\n"));
90 fprintf(stderr
, _(" ADDR := { IP_ADDRESS | any }\n"));
91 fprintf(stderr
, _(" TOS := { NUMBER | inherit }\n"));
92 fprintf(stderr
, _(" TTL := { 1..255 | inherit }\n"));
93 fprintf(stderr
, _(" KEY := { DOTTED_QUAD | NUMBER }\n"));
97 static int do_ioctl_get_ifindex(char *dev
)
103 strcpy(ifr
.ifr_name
, dev
);
104 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
105 err
= ioctl(fd
, SIOCGIFINDEX
, &ifr
);
111 return ifr
.ifr_ifindex
;
114 static int do_ioctl_get_iftype(char *dev
)
120 strcpy(ifr
.ifr_name
, dev
);
121 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
122 err
= ioctl(fd
, SIOCGIFHWADDR
, &ifr
);
128 return ifr
.ifr_addr
.sa_family
;
132 static char * do_ioctl_get_ifname(int idx
)
134 static struct ifreq ifr
;
138 ifr
.ifr_ifindex
= idx
;
139 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
140 err
= ioctl(fd
, SIOCGIFNAME
, &ifr
);
151 static int do_get_ioctl(char *basedev
, struct ip_tunnel_parm
*p
)
157 strcpy(ifr
.ifr_name
, basedev
);
158 ifr
.ifr_ifru
.ifru_data
= (void*)p
;
159 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
160 err
= ioctl(fd
, SIOCGETTUNNEL
, &ifr
);
167 static int do_add_ioctl(int cmd
, char *basedev
, struct ip_tunnel_parm
*p
)
173 strcpy(ifr
.ifr_name
, basedev
);
174 ifr
.ifr_ifru
.ifru_data
= (void*)p
;
175 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
176 err
= ioctl(fd
, cmd
, &ifr
);
183 static int do_del_ioctl(char *basedev
, struct ip_tunnel_parm
*p
)
189 strcpy(ifr
.ifr_name
, basedev
);
190 ifr
.ifr_ifru
.ifru_data
= (void*)p
;
191 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
192 err
= ioctl(fd
, SIOCDELTUNNEL
, &ifr
);
199 static int parse_args(int argc
, char **argv
, struct ip_tunnel_parm
*p
)
201 char medium
[IFNAMSIZ
];
203 memset(p
, 0, sizeof(*p
));
204 memset(&medium
, 0, sizeof(medium
));
209 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
211 p
->iph
.frag_off
= htons(IP_DF
);
214 if (strcmp(*argv
, "mode") == 0) {
216 if (strcmp(*argv
, "ipip") == 0) {
219 p
->iph
.protocol
= IPPROTO_IPIP
;
220 } else if (strcmp(*argv
, "gre") == 0) {
223 p
->iph
.protocol
= IPPROTO_GRE
;
224 } else if (strcmp(*argv
, "sit") == 0) {
227 p
->iph
.protocol
= IPPROTO_IPV6
;
230 } else if (strcmp(*argv
, "key") == 0) {
233 p
->i_flags
|= GRE_KEY
;
234 p
->o_flags
|= GRE_KEY
;
235 if (strchr(*argv
, '.'))
236 p
->i_key
= p
->o_key
= get_addr32(*argv
);
238 if (scan_number(*argv
, &uval
)<0)
240 p
->i_key
= p
->o_key
= htonl(uval
);
242 } else if (strcmp(*argv
, "ikey") == 0) {
245 p
->i_flags
|= GRE_KEY
;
246 if (strchr(*argv
, '.'))
247 p
->o_key
= get_addr32(*argv
);
249 if (scan_number(*argv
, &uval
)<0)
251 p
->i_key
= htonl(uval
);
253 } else if (strcmp(*argv
, "okey") == 0) {
256 p
->o_flags
|= GRE_KEY
;
257 if (strchr(*argv
, '.'))
258 p
->o_key
= get_addr32(*argv
);
260 if (scan_number(*argv
, &uval
)<0)
262 p
->o_key
= htonl(uval
);
264 } else if (strcmp(*argv
, "seq") == 0) {
265 p
->i_flags
|= GRE_SEQ
;
266 p
->o_flags
|= GRE_SEQ
;
267 } else if (strcmp(*argv
, "iseq") == 0) {
268 p
->i_flags
|= GRE_SEQ
;
269 } else if (strcmp(*argv
, "oseq") == 0) {
270 p
->o_flags
|= GRE_SEQ
;
271 } else if (strcmp(*argv
, "csum") == 0) {
272 p
->i_flags
|= GRE_CSUM
;
273 p
->o_flags
|= GRE_CSUM
;
274 } else if (strcmp(*argv
, "icsum") == 0) {
275 p
->i_flags
|= GRE_CSUM
;
276 } else if (strcmp(*argv
, "ocsum") == 0) {
277 p
->o_flags
|= GRE_CSUM
;
278 } else if (strcmp(*argv
, "nopmtudisc") == 0) {
280 } else if (strcmp(*argv
, "remote") == 0) {
282 if (strcmp(*argv
, "any"))
283 p
->iph
.daddr
= get_addr32(*argv
);
284 } else if (strcmp(*argv
, "local") == 0) {
286 if (strcmp(*argv
, "any"))
287 p
->iph
.saddr
= get_addr32(*argv
);
288 } else if (strcmp(*argv
, "dev") == 0) {
290 safe_strncpy(medium
, *argv
, IFNAMSIZ
-1);
291 } else if (strcmp(*argv
, "ttl") == 0) {
294 if (strcmp(*argv
, "inherit") != 0) {
295 if (scan_number(*argv
, &uval
)<0)
301 } else if (strcmp(*argv
, "tos") == 0) {
304 if (strcmp(*argv
, "inherit") != 0) {
305 if (scan_number(*argv
, &uval
)<0)
315 safe_strncpy(p
->name
, *argv
, IFNAMSIZ
);
320 if (p
->iph
.protocol
== 0) {
321 if (memcmp(p
->name
, "gre", 3) == 0)
322 p
->iph
.protocol
= IPPROTO_GRE
;
323 else if (memcmp(p
->name
, "ipip", 4) == 0)
324 p
->iph
.protocol
= IPPROTO_IPIP
;
325 else if (memcmp(p
->name
, "sit", 3) == 0)
326 p
->iph
.protocol
= IPPROTO_IPV6
;
329 if (p
->iph
.protocol
== IPPROTO_IPIP
|| p
->iph
.protocol
== IPPROTO_IPV6
) {
330 if ((p
->i_flags
& GRE_KEY
) || (p
->o_flags
& GRE_KEY
)) {
331 fprintf(stderr
, _("Keys are not allowed with ipip and sit.\n"));
337 p
->link
= do_ioctl_get_ifindex(medium
);
342 if (p
->i_key
== 0 && IN_MULTICAST(ntohl(p
->iph
.daddr
))) {
343 p
->i_key
= p
->iph
.daddr
;
344 p
->i_flags
|= GRE_KEY
;
346 if (p
->o_key
== 0 && IN_MULTICAST(ntohl(p
->iph
.daddr
))) {
347 p
->o_key
= p
->iph
.daddr
;
348 p
->o_flags
|= GRE_KEY
;
350 if (IN_MULTICAST(ntohl(p
->iph
.daddr
)) && !p
->iph
.saddr
) {
351 fprintf(stderr
, _("Broadcast tunnel requires a source address.\n"));
358 static int do_add(int cmd
, int argc
, char **argv
)
360 struct ip_tunnel_parm p
;
362 if (parse_args(argc
, argv
, &p
) < 0)
365 if (p
.iph
.ttl
&& p
.iph
.frag_off
== 0) {
366 fprintf(stderr
, _("ttl != 0 and noptmudisc are incompatible\n"));
370 switch (p
.iph
.protocol
) {
372 return do_add_ioctl(cmd
, "tunl0", &p
);
374 return do_add_ioctl(cmd
, "gre0", &p
);
376 return do_add_ioctl(cmd
, "sit0", &p
);
378 fprintf(stderr
, _("cannot determine tunnel mode (ipip, gre or sit)\n"));
384 int do_del(int argc
, char **argv
)
386 struct ip_tunnel_parm p
;
388 if (parse_args(argc
, argv
, &p
) < 0)
391 switch (p
.iph
.protocol
) {
393 return do_del_ioctl(p
.name
[0] ? p
.name
: "tunl0", &p
);
395 return do_del_ioctl(p
.name
[0] ? p
.name
: "gre0", &p
);
397 return do_del_ioctl(p
.name
[0] ? p
.name
: "sit0", &p
);
399 return do_del_ioctl(p
.name
, &p
);
404 void print_tunnel(struct ip_tunnel_parm
*p
)
411 format_host(AF_INET
, &p
->iph
.daddr
, s1
, sizeof(s1
));
412 format_host(AF_INET
, &p
->iph
.saddr
, s2
, sizeof(s2
));
413 inet_ntop(AF_INET
, &p
->i_key
, s3
, sizeof(s3
));
414 inet_ntop(AF_INET
, &p
->o_key
, s4
, sizeof(s4
));
416 printf(_("%s: %s/ip remote %s local %s "),
418 p
->iph
.protocol
== IPPROTO_IPIP
? "ip" :
419 (p
->iph
.protocol
== IPPROTO_GRE
? "gre" :
420 (p
->iph
.protocol
== IPPROTO_IPV6
? "ipv6" : _("unknown"))),
421 p
->iph
.daddr
? s1
: "any", p
->iph
.saddr
? s2
: "any");
423 char *n
= do_ioctl_get_ifname(p
->link
);
425 printf(" dev %s ", n
);
428 printf(" ttl %d ", p
->iph
.ttl
);
430 printf(" ttl inherit ");
436 printf("%c%02x ", p
->iph
.tos
&1 ? '/' : ' ', p
->iph
.tos
&~1);
438 if (!(p
->iph
.frag_off
&htons(IP_DF
)))
439 printf(" nopmtudisc");
441 if ((p
->i_flags
&GRE_KEY
) && (p
->o_flags
&GRE_KEY
) && p
->o_key
== p
->i_key
)
442 printf(" key %s", s3
);
443 else if ((p
->i_flags
|p
->o_flags
)&GRE_KEY
) {
444 if (p
->i_flags
&GRE_KEY
)
445 printf(" ikey %s ", s3
);
446 if (p
->o_flags
&GRE_KEY
)
447 printf(" okey %s ", s4
);
451 if (p
->i_flags
&GRE_SEQ
)
452 printf(_(" Drop packets out of sequence.\n"));
453 if (p
->i_flags
&GRE_CSUM
)
454 printf(_(" Checksum in received packet is required.\n"));
455 if (p
->o_flags
&GRE_SEQ
)
456 printf(_(" Sequence packets on output.\n"));
457 if (p
->o_flags
&GRE_CSUM
)
458 printf(_(" Checksum output packets.\n"));
461 static int do_tunnels_list(struct ip_tunnel_parm
*p
)
464 unsigned long rx_bytes
, rx_packets
, rx_errs
, rx_drops
,
466 tx_bytes
, tx_packets
, tx_errs
, tx_drops
,
467 tx_fifo
, tx_colls
, tx_carrier
, rx_multi
;
469 struct ip_tunnel_parm p1
;
472 FILE *fp
= fopen("/proc/net/dev", "r");
478 fgets(buf
, sizeof(buf
), fp
);
479 fgets(buf
, sizeof(buf
), fp
);
481 while (fgets(buf
, sizeof(buf
), fp
) != NULL
) {
483 buf
[sizeof(buf
) - 1] = 0;
484 if ((ptr
= strchr(buf
, ':')) == NULL
||
485 (*ptr
++ = 0, sscanf(buf
, "%s", name
) != 1)) {
486 fprintf(stderr
, _("Wrong format of /proc/net/dev. Sorry.\n"));
489 if (sscanf(ptr
, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
490 &rx_bytes
, &rx_packets
, &rx_errs
, &rx_drops
,
491 &rx_fifo
, &rx_frame
, &rx_multi
,
492 &tx_bytes
, &tx_packets
, &tx_errs
, &tx_drops
,
493 &tx_fifo
, &tx_colls
, &tx_carrier
) != 14)
495 if (p
->name
[0] && strcmp(p
->name
, name
))
497 type
= do_ioctl_get_iftype(name
);
499 fprintf(stderr
, _("Failed to get type of [%s]\n"), name
);
502 if (type
!= ARPHRD_TUNNEL
&& type
!= ARPHRD_IPGRE
&& type
!= ARPHRD_SIT
)
504 memset(&p1
, 0, sizeof(p1
));
505 if (do_get_ioctl(name
, &p1
))
507 if ((p
->link
&& p1
.link
!= p
->link
) ||
508 (p
->name
[0] && strcmp(p1
.name
, p
->name
)) ||
509 (p
->iph
.daddr
&& p1
.iph
.daddr
!= p
->iph
.daddr
) ||
510 (p
->iph
.saddr
&& p1
.iph
.saddr
!= p
->iph
.saddr
) ||
511 (p
->i_key
&& p1
.i_key
!= p
->i_key
))
515 printf(_("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts\n"));
516 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld\n",
517 rx_packets
, rx_bytes
, rx_errs
, rx_frame
, rx_fifo
, rx_multi
);
518 printf(_("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs\n"));
519 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld\n\n",
520 tx_packets
, tx_bytes
, tx_errs
, tx_colls
, tx_carrier
, tx_drops
);
526 static int do_show(int argc
, char **argv
)
529 struct ip_tunnel_parm p
;
531 if (parse_args(argc
, argv
, &p
) < 0)
534 switch (p
.iph
.protocol
) {
536 err
= do_get_ioctl(p
.name
[0] ? p
.name
: "tunl0", &p
);
539 err
= do_get_ioctl(p
.name
[0] ? p
.name
: "gre0", &p
);
542 err
= do_get_ioctl(p
.name
[0] ? p
.name
: "sit0", &p
);
555 int do_iptunnel(int argc
, char **argv
)
558 if (matches(*argv
, "add") == 0)
559 return do_add(SIOCADDTUNNEL
, argc
-1, argv
+1);
560 if (matches(*argv
, "change") == 0)
561 return do_add(SIOCCHGTUNNEL
, argc
-1, argv
+1);
562 if (matches(*argv
, "del") == 0)
563 return do_del(argc
-1, argv
+1);
564 if (matches(*argv
, "show") == 0 ||
565 matches(*argv
, "lst") == 0 ||
566 matches(*argv
, "list") == 0)
567 return do_show(argc
-1, argv
+1);
569 return do_show(0, NULL
);
575 int preferred_family
= AF_UNSPEC
;
577 int resolve_hosts
= 0;
579 int main(int argc
, char **argv
)
584 bindtextdomain("net-tools", "/usr/share/locale");
585 textdomain("net-tools");
588 basename
= strrchr(argv
[0], '/');
589 if (basename
== NULL
)
595 if (argv
[1][0] != '-')
597 if (matches(argv
[1], "-family") == 0) {
602 if (strcmp(argv
[1], "inet") == 0)
603 preferred_family
= AF_INET
;
604 else if (strcmp(argv
[1], "inet6") == 0)
605 preferred_family
= AF_INET6
;
608 } else if (matches(argv
[1], "-stats") == 0 ||
609 matches(argv
[1], "-statistics") == 0) {
611 } else if (matches(argv
[1], "-resolve") == 0) {
613 } else if ((matches(argv
[1], "-V") == 0) || (matches(argv
[1], "--version") == 0)) {
620 return do_iptunnel(argc
-1, argv
+1);