2 * link_gre.c gre 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: Herbert Xu <herbert@gondor.apana.org.au>
15 #include <sys/types.h>
16 #include <sys/socket.h>
17 #include <arpa/inet.h>
20 #include <linux/if_tunnel.h>
23 #include "ip_common.h"
26 static void print_usage(FILE *f
)
29 "Usage: ... { gre | gretap | erspan } [ remote ADDR ]\n"
37 " [ [no]ignore-df ]\n"
40 " [ encap { fou | gue | none } ]\n"
41 " [ encap-sport PORT ]\n"
42 " [ encap-dport PORT ]\n"
43 " [ [no]encap-csum ]\n"
44 " [ [no]encap-csum6 ]\n"
45 " [ [no]encap-remcsum ]\n"
49 "Where: ADDR := { IP_ADDRESS | any }\n"
50 " TOS := { NUMBER | inherit }\n"
51 " TTL := { 1..255 | inherit }\n"
52 " KEY := { DOTTED_QUAD | NUMBER }\n"
53 " MARK := { 0x0..0xffffffff }\n"
57 static void usage(void) __attribute__((noreturn
));
58 static void usage(void)
64 static int gre_parse_opt(struct link_util
*lu
, int argc
, char **argv
,
67 struct ifinfomsg
*ifi
= (struct ifinfomsg
*)(n
+ 1);
72 .n
.nlmsg_len
= NLMSG_LENGTH(sizeof(*ifi
)),
73 .n
.nlmsg_flags
= NLM_F_REQUEST
,
74 .n
.nlmsg_type
= RTM_GETLINK
,
75 .i
.ifi_family
= preferred_family
,
76 .i
.ifi_index
= ifi
->ifi_index
,
78 struct nlmsghdr
*answer
= NULL
;
79 struct rtattr
*tb
[IFLA_MAX
+ 1];
80 struct rtattr
*linkinfo
[IFLA_INFO_MAX
+1];
81 struct rtattr
*greinfo
[IFLA_GRE_MAX
+ 1];
84 unsigned int ikey
= 0;
85 unsigned int okey
= 0;
86 unsigned int saddr
= 0;
87 unsigned int daddr
= 0;
88 unsigned int link
= 0;
100 __u32 erspan_idx
= 0;
102 if (!(n
->nlmsg_flags
& NLM_F_CREATE
)) {
103 if (rtnl_talk(&rth
, &req
.n
, &answer
) < 0) {
106 "Failed to get existing tunnel info.\n");
111 len
= answer
->nlmsg_len
;
112 len
-= NLMSG_LENGTH(sizeof(*ifi
));
116 parse_rtattr(tb
, IFLA_MAX
, IFLA_RTA(NLMSG_DATA(answer
)), len
);
118 if (!tb
[IFLA_LINKINFO
])
121 parse_rtattr_nested(linkinfo
, IFLA_INFO_MAX
, tb
[IFLA_LINKINFO
]);
123 if (!linkinfo
[IFLA_INFO_DATA
])
126 parse_rtattr_nested(greinfo
, IFLA_GRE_MAX
,
127 linkinfo
[IFLA_INFO_DATA
]);
129 if (greinfo
[IFLA_GRE_IKEY
])
130 ikey
= rta_getattr_u32(greinfo
[IFLA_GRE_IKEY
]);
132 if (greinfo
[IFLA_GRE_OKEY
])
133 okey
= rta_getattr_u32(greinfo
[IFLA_GRE_OKEY
]);
135 if (greinfo
[IFLA_GRE_IFLAGS
])
136 iflags
= rta_getattr_u16(greinfo
[IFLA_GRE_IFLAGS
]);
138 if (greinfo
[IFLA_GRE_OFLAGS
])
139 oflags
= rta_getattr_u16(greinfo
[IFLA_GRE_OFLAGS
]);
141 if (greinfo
[IFLA_GRE_LOCAL
])
142 saddr
= rta_getattr_u32(greinfo
[IFLA_GRE_LOCAL
]);
144 if (greinfo
[IFLA_GRE_REMOTE
])
145 daddr
= rta_getattr_u32(greinfo
[IFLA_GRE_REMOTE
]);
147 if (greinfo
[IFLA_GRE_PMTUDISC
])
148 pmtudisc
= rta_getattr_u8(
149 greinfo
[IFLA_GRE_PMTUDISC
]);
151 if (greinfo
[IFLA_GRE_TTL
])
152 ttl
= rta_getattr_u8(greinfo
[IFLA_GRE_TTL
]);
154 if (greinfo
[IFLA_GRE_TOS
])
155 tos
= rta_getattr_u8(greinfo
[IFLA_GRE_TOS
]);
157 if (greinfo
[IFLA_GRE_LINK
])
158 link
= rta_getattr_u8(greinfo
[IFLA_GRE_LINK
]);
160 if (greinfo
[IFLA_GRE_ENCAP_TYPE
])
161 encaptype
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_TYPE
]);
162 if (greinfo
[IFLA_GRE_ENCAP_FLAGS
])
163 encapflags
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_FLAGS
]);
164 if (greinfo
[IFLA_GRE_ENCAP_SPORT
])
165 encapsport
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_SPORT
]);
166 if (greinfo
[IFLA_GRE_ENCAP_DPORT
])
167 encapdport
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_DPORT
]);
169 if (greinfo
[IFLA_GRE_COLLECT_METADATA
])
172 if (greinfo
[IFLA_GRE_IGNORE_DF
])
174 !!rta_getattr_u8(greinfo
[IFLA_GRE_IGNORE_DF
]);
176 if (greinfo
[IFLA_GRE_FWMARK
])
177 fwmark
= rta_getattr_u32(greinfo
[IFLA_GRE_FWMARK
]);
179 if (greinfo
[IFLA_GRE_ERSPAN_INDEX
])
180 erspan_idx
= rta_getattr_u32(greinfo
[IFLA_GRE_ERSPAN_INDEX
]);
186 if (!matches(*argv
, "key")) {
192 if (strchr(*argv
, '.'))
193 uval
= get_addr32(*argv
);
195 if (get_unsigned(&uval
, *argv
, 0) < 0) {
197 "Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv
);
204 } else if (!matches(*argv
, "ikey")) {
209 if (strchr(*argv
, '.'))
210 uval
= get_addr32(*argv
);
212 if (get_unsigned(&uval
, *argv
, 0) < 0) {
213 fprintf(stderr
, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv
);
219 } else if (!matches(*argv
, "okey")) {
224 if (strchr(*argv
, '.'))
225 uval
= get_addr32(*argv
);
227 if (get_unsigned(&uval
, *argv
, 0) < 0) {
228 fprintf(stderr
, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv
);
234 } else if (!matches(*argv
, "seq")) {
237 } else if (!matches(*argv
, "iseq")) {
239 } else if (!matches(*argv
, "oseq")) {
241 } else if (!matches(*argv
, "csum")) {
244 } else if (!matches(*argv
, "icsum")) {
246 } else if (!matches(*argv
, "ocsum")) {
248 } else if (!matches(*argv
, "nopmtudisc")) {
250 } else if (!matches(*argv
, "pmtudisc")) {
252 } else if (!matches(*argv
, "remote")) {
254 if (strcmp(*argv
, "any"))
255 daddr
= get_addr32(*argv
);
256 } else if (!matches(*argv
, "local")) {
258 if (strcmp(*argv
, "any"))
259 saddr
= get_addr32(*argv
);
260 } else if (!matches(*argv
, "dev")) {
262 link
= if_nametoindex(*argv
);
264 fprintf(stderr
, "Cannot find device \"%s\"\n",
268 } else if (!matches(*argv
, "ttl") ||
269 !matches(*argv
, "hoplimit")) {
273 if (strcmp(*argv
, "inherit") != 0) {
274 if (get_unsigned(&uval
, *argv
, 0))
275 invarg("invalid TTL\n", *argv
);
277 invarg("TTL must be <= 255\n", *argv
);
280 } else if (!matches(*argv
, "tos") ||
281 !matches(*argv
, "tclass") ||
282 !matches(*argv
, "dsfield")) {
286 if (strcmp(*argv
, "inherit") != 0) {
287 if (rtnl_dsfield_a2n(&uval
, *argv
))
288 invarg("bad TOS value", *argv
);
292 } else if (strcmp(*argv
, "noencap") == 0) {
293 encaptype
= TUNNEL_ENCAP_NONE
;
294 } else if (strcmp(*argv
, "encap") == 0) {
296 if (strcmp(*argv
, "fou") == 0)
297 encaptype
= TUNNEL_ENCAP_FOU
;
298 else if (strcmp(*argv
, "gue") == 0)
299 encaptype
= TUNNEL_ENCAP_GUE
;
300 else if (strcmp(*argv
, "none") == 0)
301 encaptype
= TUNNEL_ENCAP_NONE
;
303 invarg("Invalid encap type.", *argv
);
304 } else if (strcmp(*argv
, "encap-sport") == 0) {
306 if (strcmp(*argv
, "auto") == 0)
308 else if (get_u16(&encapsport
, *argv
, 0))
309 invarg("Invalid source port.", *argv
);
310 } else if (strcmp(*argv
, "encap-dport") == 0) {
312 if (get_u16(&encapdport
, *argv
, 0))
313 invarg("Invalid destination port.", *argv
);
314 } else if (strcmp(*argv
, "encap-csum") == 0) {
315 encapflags
|= TUNNEL_ENCAP_FLAG_CSUM
;
316 } else if (strcmp(*argv
, "noencap-csum") == 0) {
317 encapflags
&= ~TUNNEL_ENCAP_FLAG_CSUM
;
318 } else if (strcmp(*argv
, "encap-udp6-csum") == 0) {
319 encapflags
|= TUNNEL_ENCAP_FLAG_CSUM6
;
320 } else if (strcmp(*argv
, "noencap-udp6-csum") == 0) {
321 encapflags
|= ~TUNNEL_ENCAP_FLAG_CSUM6
;
322 } else if (strcmp(*argv
, "encap-remcsum") == 0) {
323 encapflags
|= TUNNEL_ENCAP_FLAG_REMCSUM
;
324 } else if (strcmp(*argv
, "noencap-remcsum") == 0) {
325 encapflags
|= ~TUNNEL_ENCAP_FLAG_REMCSUM
;
326 } else if (strcmp(*argv
, "external") == 0) {
328 } else if (strcmp(*argv
, "ignore-df") == 0) {
330 } else if (strcmp(*argv
, "noignore-df") == 0) {
332 *only the lsb is significant, use 2 for presence
335 } else if (strcmp(*argv
, "fwmark") == 0) {
337 if (get_u32(&fwmark
, *argv
, 0))
338 invarg("invalid fwmark\n", *argv
);
339 } else if (strcmp(*argv
, "erspan") == 0) {
341 if (get_u32(&erspan_idx
, *argv
, 0))
342 invarg("invalid erspan index\n", *argv
);
343 if (erspan_idx
& ~((1<<20) - 1) || erspan_idx
== 0)
344 invarg("erspan index must be > 0 and <= 20-bit\n", *argv
);
350 if (!ikey
&& IN_MULTICAST(ntohl(daddr
))) {
354 if (!okey
&& IN_MULTICAST(ntohl(daddr
))) {
358 if (IN_MULTICAST(ntohl(daddr
)) && !saddr
) {
359 fprintf(stderr
, "A broadcast tunnel requires a source address.\n");
364 addattr32(n
, 1024, IFLA_GRE_IKEY
, ikey
);
365 addattr32(n
, 1024, IFLA_GRE_OKEY
, okey
);
366 addattr_l(n
, 1024, IFLA_GRE_IFLAGS
, &iflags
, 2);
367 addattr_l(n
, 1024, IFLA_GRE_OFLAGS
, &oflags
, 2);
368 addattr_l(n
, 1024, IFLA_GRE_LOCAL
, &saddr
, 4);
369 addattr_l(n
, 1024, IFLA_GRE_REMOTE
, &daddr
, 4);
370 addattr_l(n
, 1024, IFLA_GRE_PMTUDISC
, &pmtudisc
, 1);
372 addattr32(n
, 1024, IFLA_GRE_LINK
, link
);
373 addattr_l(n
, 1024, IFLA_GRE_TTL
, &ttl
, 1);
374 addattr_l(n
, 1024, IFLA_GRE_TOS
, &tos
, 1);
375 addattr32(n
, 1024, IFLA_GRE_FWMARK
, fwmark
);
377 addattr32(n
, 1024, IFLA_GRE_ERSPAN_INDEX
, erspan_idx
);
379 addattr_l(n
, 1024, IFLA_GRE_COLLECT_METADATA
, NULL
, 0);
382 addattr16(n
, 1024, IFLA_GRE_ENCAP_TYPE
, encaptype
);
383 addattr16(n
, 1024, IFLA_GRE_ENCAP_FLAGS
, encapflags
);
384 addattr16(n
, 1024, IFLA_GRE_ENCAP_SPORT
, htons(encapsport
));
385 addattr16(n
, 1024, IFLA_GRE_ENCAP_DPORT
, htons(encapdport
));
388 addattr8(n
, 1024, IFLA_GRE_IGNORE_DF
, ignore_df
& 1);
393 static void gre_print_direct_opt(FILE *f
, struct rtattr
*tb
[])
396 const char *local
= "any";
397 const char *remote
= "any";
398 unsigned int iflags
= 0;
399 unsigned int oflags
= 0;
401 if (tb
[IFLA_GRE_REMOTE
]) {
402 unsigned int addr
= rta_getattr_u32(tb
[IFLA_GRE_REMOTE
]);
405 remote
= format_host(AF_INET
, 4, &addr
);
408 print_string(PRINT_ANY
, "remote", "remote %s ", remote
);
410 if (tb
[IFLA_GRE_LOCAL
]) {
411 unsigned int addr
= rta_getattr_u32(tb
[IFLA_GRE_LOCAL
]);
414 local
= format_host(AF_INET
, 4, &addr
);
417 print_string(PRINT_ANY
, "local", "local %s ", local
);
419 if (tb
[IFLA_GRE_LINK
] && rta_getattr_u32(tb
[IFLA_GRE_LINK
])) {
420 unsigned int link
= rta_getattr_u32(tb
[IFLA_GRE_LINK
]);
421 const char *n
= if_indextoname(link
, s2
);
424 print_string(PRINT_ANY
, "link", "dev %s ", n
);
426 print_uint(PRINT_ANY
, "link_index", "dev %u ", link
);
429 if (tb
[IFLA_GRE_TTL
]) {
430 __u8 ttl
= rta_getattr_u8(tb
[IFLA_GRE_TTL
]);
433 print_int(PRINT_ANY
, "ttl", "ttl %d ", ttl
);
435 print_int(PRINT_JSON
, "ttl", NULL
, ttl
);
437 print_string(PRINT_FP
, NULL
, "ttl %s ", "inherit");
440 if (tb
[IFLA_GRE_TOS
] && rta_getattr_u8(tb
[IFLA_GRE_TOS
])) {
441 int tos
= rta_getattr_u8(tb
[IFLA_GRE_TOS
]);
443 if (is_json_context()) {
446 snprintf(b1
, sizeof(b1
), "0x%x", tos
);
447 print_string(PRINT_JSON
, "tos", NULL
, b1
);
451 fputs("inherit ", f
);
453 fprintf(f
, "0x%x ", tos
);
457 if (tb
[IFLA_GRE_PMTUDISC
]) {
458 if (!rta_getattr_u8(tb
[IFLA_GRE_PMTUDISC
]))
459 print_bool(PRINT_ANY
, "pmtudisc", "nopmtudisc ", false);
461 print_bool(PRINT_JSON
, "pmtudisc", NULL
, true);
464 if (tb
[IFLA_GRE_IFLAGS
])
465 iflags
= rta_getattr_u16(tb
[IFLA_GRE_IFLAGS
]);
467 if (tb
[IFLA_GRE_OFLAGS
])
468 oflags
= rta_getattr_u16(tb
[IFLA_GRE_OFLAGS
]);
470 if ((iflags
& GRE_KEY
) && tb
[IFLA_GRE_IKEY
]) {
471 inet_ntop(AF_INET
, RTA_DATA(tb
[IFLA_GRE_IKEY
]), s2
, sizeof(s2
));
472 print_string(PRINT_ANY
, "ikey", "ikey %s ", s2
);
475 if ((oflags
& GRE_KEY
) && tb
[IFLA_GRE_OKEY
]) {
476 inet_ntop(AF_INET
, RTA_DATA(tb
[IFLA_GRE_OKEY
]), s2
, sizeof(s2
));
477 print_string(PRINT_ANY
, "okey", "okey %s ", s2
);
480 if (iflags
& GRE_SEQ
)
481 print_bool(PRINT_ANY
, "iseq", "iseq ", true);
482 if (oflags
& GRE_SEQ
)
483 print_bool(PRINT_ANY
, "oseq", "oseq ", true);
484 if (iflags
& GRE_CSUM
)
485 print_bool(PRINT_ANY
, "icsum", "icsum ", true);
486 if (oflags
& GRE_CSUM
)
487 print_bool(PRINT_ANY
, "ocsum", "ocsum ", true);
489 if (tb
[IFLA_GRE_FWMARK
]) {
490 __u32 fwmark
= rta_getattr_u32(tb
[IFLA_GRE_FWMARK
]);
493 snprintf(s2
, sizeof(s2
), "0x%x", fwmark
);
495 print_string(PRINT_ANY
, "fwmark", "fwmark %s ", s2
);
500 static void gre_print_opt(struct link_util
*lu
, FILE *f
, struct rtattr
*tb
[])
505 if (!tb
[IFLA_GRE_COLLECT_METADATA
])
506 gre_print_direct_opt(f
, tb
);
508 print_bool(PRINT_ANY
, "external", "external ", true);
510 if (tb
[IFLA_GRE_IGNORE_DF
] && rta_getattr_u8(tb
[IFLA_GRE_IGNORE_DF
]))
511 print_bool(PRINT_ANY
, "ignore_df", "ignore-df ", true);
513 if (tb
[IFLA_GRE_ERSPAN_INDEX
]) {
514 __u32 erspan_idx
= rta_getattr_u32(tb
[IFLA_GRE_ERSPAN_INDEX
]);
516 fprintf(f
, "erspan_index %u ", erspan_idx
);
519 if (tb
[IFLA_GRE_ENCAP_TYPE
] &&
520 rta_getattr_u16(tb
[IFLA_GRE_ENCAP_TYPE
]) != TUNNEL_ENCAP_NONE
) {
521 __u16 type
= rta_getattr_u16(tb
[IFLA_GRE_ENCAP_TYPE
]);
522 __u16 flags
= rta_getattr_u16(tb
[IFLA_GRE_ENCAP_FLAGS
]);
523 __u16 sport
= rta_getattr_u16(tb
[IFLA_GRE_ENCAP_SPORT
]);
524 __u16 dport
= rta_getattr_u16(tb
[IFLA_GRE_ENCAP_DPORT
]);
527 open_json_object("encap");
528 print_string(PRINT_FP
, NULL
, "encap ", NULL
);
531 case TUNNEL_ENCAP_FOU
:
532 print_string(PRINT_ANY
, "type", "%s ", "fou");
534 case TUNNEL_ENCAP_GUE
:
535 print_string(PRINT_ANY
, "type", "%s ", "gue");
538 print_null(PRINT_ANY
, "type", "%s ", "unknown");
542 if (is_json_context()) {
543 print_uint(PRINT_JSON
,
546 sport
? ntohs(sport
) : 0);
547 print_uint(PRINT_JSON
, "dport", NULL
, ntohs(dport
));
549 print_bool(PRINT_JSON
,
552 flags
& TUNNEL_ENCAP_FLAG_CSUM
);
554 print_bool(PRINT_JSON
,
557 flags
& TUNNEL_ENCAP_FLAG_CSUM6
);
559 print_bool(PRINT_JSON
,
562 flags
& TUNNEL_ENCAP_FLAG_REMCSUM
);
567 fputs("encap-sport auto ", f
);
569 fprintf(f
, "encap-sport %u", ntohs(sport
));
571 fprintf(f
, "encap-dport %u ", ntohs(dport
));
573 if (flags
& TUNNEL_ENCAP_FLAG_CSUM
)
574 fputs("encap-csum ", f
);
576 fputs("noencap-csum ", f
);
578 if (flags
& TUNNEL_ENCAP_FLAG_CSUM6
)
579 fputs("encap-csum6 ", f
);
581 fputs("noencap-csum6 ", f
);
583 if (flags
& TUNNEL_ENCAP_FLAG_REMCSUM
)
584 fputs("encap-remcsum ", f
);
586 fputs("noencap-remcsum ", f
);
591 static void gre_print_help(struct link_util
*lu
, int argc
, char **argv
,
597 struct link_util gre_link_util
= {
599 .maxattr
= IFLA_GRE_MAX
,
600 .parse_opt
= gre_parse_opt
,
601 .print_opt
= gre_print_opt
,
602 .print_help
= gre_print_help
,
605 struct link_util gretap_link_util
= {
607 .maxattr
= IFLA_GRE_MAX
,
608 .parse_opt
= gre_parse_opt
,
609 .print_opt
= gre_print_opt
,
610 .print_help
= gre_print_help
,
613 struct link_util erspan_link_util
= {
615 .maxattr
= IFLA_GRE_MAX
,
616 .parse_opt
= gre_parse_opt
,
617 .print_opt
= gre_print_opt
,
618 .print_help
= gre_print_help
,