2 * link_iptnl.c ipip and sit driver module
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: Nicolas Dichtel <nicolas.dichtel@6wind.com>
15 #include <sys/types.h>
16 #include <sys/socket.h>
17 #include <arpa/inet.h>
21 #include <linux/if_tunnel.h>
24 #include "ip_common.h"
27 static void print_usage(FILE *f
, int sit
)
29 const char *type
= sit
? "sit " : "ipip";
32 "Usage: ... %s [ remote ADDR ]\n"
38 " [ 6rd-prefix ADDR ]\n"
39 " [ 6rd-relay_prefix ADDR ]\n"
42 " [ encap { fou | gue | none } ]\n"
43 " [ encap-sport PORT ]\n"
44 " [ encap-dport PORT ]\n"
45 " [ [no]encap-csum ]\n"
46 " [ [no]encap-csum6 ]\n"
47 " [ [no]encap-remcsum ]\n",
51 fprintf(f
, " [ mode { ip6ip | ipip | mplsip | any } ]\n");
52 fprintf(f
, " [ isatap ]\n");
54 fprintf(f
, " [ mode { ipip | mplsip | any } ]\n");
56 fprintf(f
, " [ external ]\n");
57 fprintf(f
, " [ fwmark MARK ]\n");
59 fprintf(f
, "Where: ADDR := { IP_ADDRESS | any }\n");
60 fprintf(f
, " TOS := { NUMBER | inherit }\n");
61 fprintf(f
, " TTL := { 1..255 | inherit }\n");
62 fprintf(f
, " MARK := { 0x0..0xffffffff }\n");
65 static void usage(int sit
) __attribute__((noreturn
));
66 static void usage(int sit
)
68 print_usage(stderr
, sit
);
72 static int iptunnel_parse_opt(struct link_util
*lu
, int argc
, char **argv
,
75 struct ifinfomsg
*ifi
= (struct ifinfomsg
*)(n
+ 1);
80 .n
.nlmsg_len
= NLMSG_LENGTH(sizeof(*ifi
)),
81 .n
.nlmsg_flags
= NLM_F_REQUEST
,
82 .n
.nlmsg_type
= RTM_GETLINK
,
83 .i
.ifi_family
= preferred_family
,
84 .i
.ifi_index
= ifi
->ifi_index
,
86 struct nlmsghdr
*answer
;
87 struct rtattr
*tb
[IFLA_MAX
+ 1];
88 struct rtattr
*linkinfo
[IFLA_INFO_MAX
+1];
89 struct rtattr
*iptuninfo
[IFLA_IPTUN_MAX
+ 1];
99 struct in6_addr ip6rdprefix
= {};
100 __u16 ip6rdprefixlen
= 0;
101 __u32 ip6rdrelayprefix
= 0;
102 __u16 ip6rdrelayprefixlen
= 0;
104 __u16 encapflags
= 0;
105 __u16 encapsport
= 0;
106 __u16 encapdport
= 0;
110 if (!(n
->nlmsg_flags
& NLM_F_CREATE
)) {
111 if (rtnl_talk(&rth
, &req
.n
, &answer
) < 0) {
114 "Failed to get existing tunnel info.\n");
118 len
= answer
->nlmsg_len
;
119 len
-= NLMSG_LENGTH(sizeof(*ifi
));
123 parse_rtattr(tb
, IFLA_MAX
, IFLA_RTA(NLMSG_DATA(answer
)), len
);
125 if (!tb
[IFLA_LINKINFO
])
128 parse_rtattr_nested(linkinfo
, IFLA_INFO_MAX
, tb
[IFLA_LINKINFO
]);
130 if (!linkinfo
[IFLA_INFO_DATA
])
133 parse_rtattr_nested(iptuninfo
, IFLA_IPTUN_MAX
,
134 linkinfo
[IFLA_INFO_DATA
]);
136 if (iptuninfo
[IFLA_IPTUN_LOCAL
])
137 laddr
= rta_getattr_u32(iptuninfo
[IFLA_IPTUN_LOCAL
]);
139 if (iptuninfo
[IFLA_IPTUN_REMOTE
])
140 raddr
= rta_getattr_u32(iptuninfo
[IFLA_IPTUN_REMOTE
]);
142 if (iptuninfo
[IFLA_IPTUN_TTL
])
143 ttl
= rta_getattr_u8(iptuninfo
[IFLA_IPTUN_TTL
]);
145 if (iptuninfo
[IFLA_IPTUN_TOS
])
146 tos
= rta_getattr_u8(iptuninfo
[IFLA_IPTUN_TOS
]);
148 if (iptuninfo
[IFLA_IPTUN_PMTUDISC
])
150 rta_getattr_u8(iptuninfo
[IFLA_IPTUN_PMTUDISC
]);
152 if (iptuninfo
[IFLA_IPTUN_FLAGS
])
153 iflags
= rta_getattr_u16(iptuninfo
[IFLA_IPTUN_FLAGS
]);
155 if (iptuninfo
[IFLA_IPTUN_LINK
])
156 link
= rta_getattr_u32(iptuninfo
[IFLA_IPTUN_LINK
]);
158 if (iptuninfo
[IFLA_IPTUN_PROTO
])
159 proto
= rta_getattr_u8(iptuninfo
[IFLA_IPTUN_PROTO
]);
161 if (iptuninfo
[IFLA_IPTUN_ENCAP_TYPE
])
162 encaptype
= rta_getattr_u16(iptuninfo
[IFLA_IPTUN_ENCAP_TYPE
]);
163 if (iptuninfo
[IFLA_IPTUN_ENCAP_FLAGS
])
164 encapflags
= rta_getattr_u16(iptuninfo
[IFLA_IPTUN_ENCAP_FLAGS
]);
165 if (iptuninfo
[IFLA_IPTUN_ENCAP_SPORT
])
166 encapsport
= rta_getattr_u16(iptuninfo
[IFLA_IPTUN_ENCAP_SPORT
]);
167 if (iptuninfo
[IFLA_IPTUN_ENCAP_DPORT
])
168 encapdport
= rta_getattr_u16(iptuninfo
[IFLA_IPTUN_ENCAP_DPORT
]);
169 if (iptuninfo
[IFLA_IPTUN_6RD_PREFIX
])
171 RTA_DATA(iptuninfo
[IFLA_IPTUN_6RD_PREFIX
]),
174 if (iptuninfo
[IFLA_IPTUN_6RD_PREFIXLEN
])
176 rta_getattr_u16(iptuninfo
[IFLA_IPTUN_6RD_PREFIXLEN
]);
178 if (iptuninfo
[IFLA_IPTUN_6RD_RELAY_PREFIX
])
180 rta_getattr_u32(iptuninfo
[IFLA_IPTUN_6RD_RELAY_PREFIX
]);
182 if (iptuninfo
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
])
183 ip6rdrelayprefixlen
=
184 rta_getattr_u16(iptuninfo
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
]);
185 if (iptuninfo
[IFLA_IPTUN_COLLECT_METADATA
])
188 if (iptuninfo
[IFLA_IPTUN_FWMARK
])
189 fwmark
= rta_getattr_u32(iptuninfo
[IFLA_IPTUN_FWMARK
]);
195 if (strcmp(*argv
, "remote") == 0) {
197 raddr
= get_addr32(*argv
);
198 } else if (strcmp(*argv
, "local") == 0) {
200 laddr
= get_addr32(*argv
);
201 } else if (matches(*argv
, "dev") == 0) {
203 link
= if_nametoindex(*argv
);
205 invarg("\"dev\" is invalid", *argv
);
206 } else if (strcmp(*argv
, "ttl") == 0 ||
207 strcmp(*argv
, "hoplimit") == 0) {
209 if (strcmp(*argv
, "inherit") != 0) {
210 if (get_u8(&ttl
, *argv
, 0))
211 invarg("invalid TTL\n", *argv
);
214 } else if (strcmp(*argv
, "tos") == 0 ||
215 strcmp(*argv
, "tclass") == 0 ||
216 matches(*argv
, "dsfield") == 0) {
220 if (strcmp(*argv
, "inherit") != 0) {
221 if (rtnl_dsfield_a2n(&uval
, *argv
))
222 invarg("bad TOS value", *argv
);
226 } else if (strcmp(*argv
, "nopmtudisc") == 0) {
228 } else if (strcmp(*argv
, "pmtudisc") == 0) {
230 } else if (strcmp(lu
->id
, "sit") == 0 &&
231 strcmp(*argv
, "isatap") == 0) {
232 iflags
|= SIT_ISATAP
;
233 } else if (strcmp(*argv
, "mode") == 0) {
235 if (strcmp(lu
->id
, "sit") == 0 &&
236 (strcmp(*argv
, "ipv6/ipv4") == 0 ||
237 strcmp(*argv
, "ip6ip") == 0))
238 proto
= IPPROTO_IPV6
;
239 else if (strcmp(*argv
, "ipv4/ipv4") == 0 ||
240 strcmp(*argv
, "ipip") == 0 ||
241 strcmp(*argv
, "ip4ip4") == 0)
242 proto
= IPPROTO_IPIP
;
243 else if (strcmp(*argv
, "mpls/ipv4") == 0 ||
244 strcmp(*argv
, "mplsip") == 0)
245 proto
= IPPROTO_MPLS
;
246 else if (strcmp(*argv
, "any/ipv4") == 0 ||
247 strcmp(*argv
, "any") == 0)
250 invarg("Cannot guess tunnel mode.", *argv
);
251 } else if (strcmp(*argv
, "noencap") == 0) {
252 encaptype
= TUNNEL_ENCAP_NONE
;
253 } else if (strcmp(*argv
, "encap") == 0) {
255 if (strcmp(*argv
, "fou") == 0)
256 encaptype
= TUNNEL_ENCAP_FOU
;
257 else if (strcmp(*argv
, "gue") == 0)
258 encaptype
= TUNNEL_ENCAP_GUE
;
259 else if (strcmp(*argv
, "none") == 0)
260 encaptype
= TUNNEL_ENCAP_NONE
;
262 invarg("Invalid encap type.", *argv
);
263 } else if (strcmp(*argv
, "encap-sport") == 0) {
265 if (strcmp(*argv
, "auto") == 0)
267 else if (get_u16(&encapsport
, *argv
, 0))
268 invarg("Invalid source port.", *argv
);
269 } else if (strcmp(*argv
, "encap-dport") == 0) {
271 if (get_u16(&encapdport
, *argv
, 0))
272 invarg("Invalid destination port.", *argv
);
273 } else if (strcmp(*argv
, "encap-csum") == 0) {
274 encapflags
|= TUNNEL_ENCAP_FLAG_CSUM
;
275 } else if (strcmp(*argv
, "noencap-csum") == 0) {
276 encapflags
&= ~TUNNEL_ENCAP_FLAG_CSUM
;
277 } else if (strcmp(*argv
, "encap-udp6-csum") == 0) {
278 encapflags
|= TUNNEL_ENCAP_FLAG_CSUM6
;
279 } else if (strcmp(*argv
, "noencap-udp6-csum") == 0) {
280 encapflags
&= ~TUNNEL_ENCAP_FLAG_CSUM6
;
281 } else if (strcmp(*argv
, "encap-remcsum") == 0) {
282 encapflags
|= TUNNEL_ENCAP_FLAG_REMCSUM
;
283 } else if (strcmp(*argv
, "noencap-remcsum") == 0) {
284 encapflags
&= ~TUNNEL_ENCAP_FLAG_REMCSUM
;
285 } else if (strcmp(*argv
, "external") == 0) {
287 } else if (strcmp(*argv
, "6rd-prefix") == 0) {
291 if (get_prefix(&prefix
, *argv
, AF_INET6
))
292 invarg("invalid 6rd_prefix\n", *argv
);
293 memcpy(&ip6rdprefix
, prefix
.data
, 16);
294 ip6rdprefixlen
= prefix
.bitlen
;
295 } else if (strcmp(*argv
, "6rd-relay_prefix") == 0) {
299 if (get_prefix(&prefix
, *argv
, AF_INET
))
300 invarg("invalid 6rd-relay_prefix\n", *argv
);
301 memcpy(&ip6rdrelayprefix
, prefix
.data
, 4);
302 ip6rdrelayprefixlen
= prefix
.bitlen
;
303 } else if (strcmp(*argv
, "6rd-reset") == 0) {
306 get_prefix(&prefix
, "2002::", AF_INET6
);
307 memcpy(&ip6rdprefix
, prefix
.data
, 16);
309 ip6rdrelayprefix
= 0;
310 ip6rdrelayprefixlen
= 0;
311 } else if (strcmp(*argv
, "fwmark") == 0) {
313 if (get_u32(&fwmark
, *argv
, 0))
314 invarg("invalid fwmark\n", *argv
);
316 usage(strcmp(lu
->id
, "sit") == 0);
320 if (ttl
&& pmtudisc
== 0) {
321 fprintf(stderr
, "ttl != 0 and nopmtudisc are incompatible\n");
325 addattr8(n
, 1024, IFLA_IPTUN_PROTO
, proto
);
327 addattr_l(n
, 1024, IFLA_IPTUN_COLLECT_METADATA
, NULL
, 0);
331 addattr32(n
, 1024, IFLA_IPTUN_LINK
, link
);
332 addattr32(n
, 1024, IFLA_IPTUN_LOCAL
, laddr
);
333 addattr32(n
, 1024, IFLA_IPTUN_REMOTE
, raddr
);
334 addattr8(n
, 1024, IFLA_IPTUN_TTL
, ttl
);
335 addattr8(n
, 1024, IFLA_IPTUN_TOS
, tos
);
336 addattr8(n
, 1024, IFLA_IPTUN_PMTUDISC
, pmtudisc
);
337 addattr32(n
, 1024, IFLA_IPTUN_FWMARK
, fwmark
);
339 addattr16(n
, 1024, IFLA_IPTUN_ENCAP_TYPE
, encaptype
);
340 addattr16(n
, 1024, IFLA_IPTUN_ENCAP_FLAGS
, encapflags
);
341 addattr16(n
, 1024, IFLA_IPTUN_ENCAP_SPORT
, htons(encapsport
));
342 addattr16(n
, 1024, IFLA_IPTUN_ENCAP_DPORT
, htons(encapdport
));
344 if (strcmp(lu
->id
, "sit") == 0) {
345 addattr16(n
, 1024, IFLA_IPTUN_FLAGS
, iflags
);
346 if (ip6rdprefixlen
) {
347 addattr_l(n
, 1024, IFLA_IPTUN_6RD_PREFIX
,
348 &ip6rdprefix
, sizeof(ip6rdprefix
));
349 addattr16(n
, 1024, IFLA_IPTUN_6RD_PREFIXLEN
,
351 addattr32(n
, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX
,
353 addattr16(n
, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN
,
354 ip6rdrelayprefixlen
);
361 static void iptunnel_print_opt(struct link_util
*lu
, FILE *f
, struct rtattr
*tb
[])
365 const char *local
= "any";
366 const char *remote
= "any";
367 __u16 prefixlen
, type
;
372 if (tb
[IFLA_IPTUN_COLLECT_METADATA
])
373 print_bool(PRINT_ANY
, "external", "external ", true);
375 if (tb
[IFLA_IPTUN_PROTO
]) {
376 switch (rta_getattr_u8(tb
[IFLA_IPTUN_PROTO
])) {
378 print_string(PRINT_ANY
, "proto", "%s ", "ipip");
381 print_string(PRINT_ANY
, "proto", "%s ", "ip6ip");
384 print_string(PRINT_ANY
, "proto", "%s ", "mplsip");
387 print_string(PRINT_ANY
, "proto", "%s ", "any");
392 if (tb
[IFLA_IPTUN_REMOTE
]) {
393 unsigned int addr
= rta_getattr_u32(tb
[IFLA_IPTUN_REMOTE
]);
396 remote
= format_host(AF_INET
, 4, &addr
);
399 print_string(PRINT_ANY
, "remote", "remote %s ", remote
);
401 if (tb
[IFLA_IPTUN_LOCAL
]) {
402 unsigned int addr
= rta_getattr_u32(tb
[IFLA_IPTUN_LOCAL
]);
405 local
= format_host(AF_INET
, 4, &addr
);
408 print_string(PRINT_ANY
, "local", "local %s ", local
);
410 if (tb
[IFLA_IPTUN_LINK
] && rta_getattr_u32(tb
[IFLA_IPTUN_LINK
])) {
411 unsigned int link
= rta_getattr_u32(tb
[IFLA_IPTUN_LINK
]);
412 const char *n
= if_indextoname(link
, s2
);
415 print_string(PRINT_ANY
, "link", "dev %s ", n
);
417 print_int(PRINT_ANY
, "link_index", "dev %u ", link
);
420 if (tb
[IFLA_IPTUN_TTL
]) {
421 __u8 ttl
= rta_getattr_u8(tb
[IFLA_IPTUN_TTL
]);
424 print_int(PRINT_ANY
, "ttl", "ttl %d ", ttl
);
426 print_int(PRINT_JSON
, "ttl", NULL
, ttl
);
428 print_string(PRINT_FP
, NULL
, "ttl %s ", "inherit");
431 if (tb
[IFLA_IPTUN_TOS
]) {
432 int tos
= rta_getattr_u8(tb
[IFLA_IPTUN_TOS
]);
435 if (is_json_context()) {
436 print_0xhex(PRINT_JSON
, "tos", "%#x", tos
);
440 fputs("inherit ", f
);
442 fprintf(f
, "0x%x ", tos
);
447 if (tb
[IFLA_IPTUN_PMTUDISC
] && rta_getattr_u8(tb
[IFLA_IPTUN_PMTUDISC
]))
448 print_bool(PRINT_ANY
, "pmtudisc", "pmtudisc ", true);
450 print_bool(PRINT_ANY
, "pmtudisc", "nopmtudisc ", false);
452 if (tb
[IFLA_IPTUN_FLAGS
]) {
453 __u16 iflags
= rta_getattr_u16(tb
[IFLA_IPTUN_FLAGS
]);
455 if (iflags
& SIT_ISATAP
)
456 print_bool(PRINT_ANY
, "isatap", "isatap ", true);
459 if (tb
[IFLA_IPTUN_6RD_PREFIXLEN
] &&
460 (prefixlen
= rta_getattr_u16(tb
[IFLA_IPTUN_6RD_PREFIXLEN
]))) {
461 __u16 relayprefixlen
=
462 rta_getattr_u16(tb
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
]);
464 rta_getattr_u32(tb
[IFLA_IPTUN_6RD_RELAY_PREFIX
]);
466 const char *prefix
= inet_ntop(AF_INET6
,
467 RTA_DATA(tb
[IFLA_IPTUN_6RD_PREFIX
]),
470 if (is_json_context()) {
471 print_string(PRINT_JSON
, "prefix", NULL
, prefix
);
472 print_int(PRINT_JSON
, "prefixlen", NULL
, prefixlen
);
474 print_string(PRINT_JSON
,
480 print_int(PRINT_JSON
,
486 printf("6rd-prefix %s/%u ", prefix
, prefixlen
);
488 printf("6rd-relay_prefix %s/%u ",
489 format_host(AF_INET
, 4, &relayprefix
),
495 if (tb
[IFLA_IPTUN_ENCAP_TYPE
] &&
496 (type
= rta_getattr_u16(tb
[IFLA_IPTUN_ENCAP_TYPE
])) != TUNNEL_ENCAP_NONE
) {
497 __u16 flags
= rta_getattr_u16(tb
[IFLA_IPTUN_ENCAP_FLAGS
]);
498 __u16 sport
= rta_getattr_u16(tb
[IFLA_IPTUN_ENCAP_SPORT
]);
499 __u16 dport
= rta_getattr_u16(tb
[IFLA_IPTUN_ENCAP_DPORT
]);
501 print_string(PRINT_FP
, NULL
, "encap ", NULL
);
503 case TUNNEL_ENCAP_FOU
:
504 print_string(PRINT_ANY
, "type", "%s ", "fou");
506 case TUNNEL_ENCAP_GUE
:
507 print_string(PRINT_ANY
, "type", "%s ", "gue");
510 print_null(PRINT_ANY
, "type", "unknown ", NULL
);
514 if (is_json_context()) {
515 print_uint(PRINT_JSON
,
518 sport
? ntohs(sport
) : 0);
519 print_uint(PRINT_JSON
, "dport", NULL
, ntohs(dport
));
520 print_bool(PRINT_JSON
,
523 flags
& TUNNEL_ENCAP_FLAG_CSUM
);
524 print_bool(PRINT_JSON
,
527 flags
& TUNNEL_ENCAP_FLAG_CSUM6
);
528 print_bool(PRINT_JSON
,
531 flags
& TUNNEL_ENCAP_FLAG_REMCSUM
);
535 fputs("encap-sport auto ", f
);
537 fprintf(f
, "encap-sport %u", ntohs(sport
));
539 fprintf(f
, "encap-dport %u ", ntohs(dport
));
541 if (flags
& TUNNEL_ENCAP_FLAG_CSUM
)
542 fputs("encap-csum ", f
);
544 fputs("noencap-csum ", f
);
546 if (flags
& TUNNEL_ENCAP_FLAG_CSUM6
)
547 fputs("encap-csum6 ", f
);
549 fputs("noencap-csum6 ", f
);
551 if (flags
& TUNNEL_ENCAP_FLAG_REMCSUM
)
552 fputs("encap-remcsum ", f
);
554 fputs("noencap-remcsum ", f
);
558 if (tb
[IFLA_IPTUN_FWMARK
]) {
559 __u32 fwmark
= rta_getattr_u32(tb
[IFLA_IPTUN_FWMARK
]);
562 snprintf(s2
, sizeof(s2
), "0x%x", fwmark
);
564 print_string(PRINT_ANY
, "fwmark", "fwmark %s ", s2
);
569 static void iptunnel_print_help(struct link_util
*lu
, int argc
, char **argv
,
572 print_usage(f
, strcmp(lu
->id
, "sit") == 0);
575 struct link_util ipip_link_util
= {
577 .maxattr
= IFLA_IPTUN_MAX
,
578 .parse_opt
= iptunnel_parse_opt
,
579 .print_opt
= iptunnel_print_opt
,
580 .print_help
= iptunnel_print_help
,
583 struct link_util sit_link_util
= {
585 .maxattr
= IFLA_IPTUN_MAX
,
586 .parse_opt
= iptunnel_parse_opt
,
587 .print_opt
= iptunnel_print_opt
,
588 .print_help
= iptunnel_print_help
,