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 gre_print_help(struct link_util
*lu
, int argc
, char **argv
, FILE *f
)
29 "Usage: ... %-9s [ remote ADDR ]\n"
32 " [ [i|o]key KEY | no[i|o]key ]\n"
33 " [ [no][i|o]csum ]\n"
37 " [ [no]ignore-df ]\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"
48 " [ erspan_ver version ]\n"
50 " [ erspan_dir { ingress | egress } ]\n"
51 " [ erspan_hwid hwid ]\n"
53 "Where: ADDR := { IP_ADDRESS | any }\n"
54 " TOS := { NUMBER | inherit }\n"
55 " TTL := { 1..255 | inherit }\n"
56 " KEY := { DOTTED_QUAD | NUMBER }\n"
57 " MARK := { 0x0..0xffffffff }\n",
61 static int gre_parse_opt(struct link_util
*lu
, int argc
, char **argv
,
64 struct ifinfomsg
*ifi
= NLMSG_DATA(n
);
69 .n
.nlmsg_len
= NLMSG_LENGTH(sizeof(*ifi
)),
70 .n
.nlmsg_flags
= NLM_F_REQUEST
,
71 .n
.nlmsg_type
= RTM_GETLINK
,
72 .i
.ifi_family
= preferred_family
,
73 .i
.ifi_index
= ifi
->ifi_index
,
75 struct nlmsghdr
*answer
;
76 struct rtattr
*tb
[IFLA_MAX
+ 1];
77 struct rtattr
*linkinfo
[IFLA_INFO_MAX
+1];
78 struct rtattr
*greinfo
[IFLA_GRE_MAX
+ 1];
84 inet_prefix saddr
, daddr
;
99 __u16 erspan_hwid
= 0;
101 inet_prefix_reset(&saddr
);
102 inet_prefix_reset(&daddr
);
104 if (!(n
->nlmsg_flags
& NLM_F_CREATE
)) {
105 const struct rtattr
*rta
;
107 if (rtnl_talk(&rth
, &req
.n
, &answer
) < 0) {
110 "Failed to get existing tunnel info.\n");
114 len
= answer
->nlmsg_len
;
115 len
-= NLMSG_LENGTH(sizeof(*ifi
));
119 parse_rtattr(tb
, IFLA_MAX
, IFLA_RTA(NLMSG_DATA(answer
)), len
);
121 if (!tb
[IFLA_LINKINFO
])
124 parse_rtattr_nested(linkinfo
, IFLA_INFO_MAX
, tb
[IFLA_LINKINFO
]);
126 if (!linkinfo
[IFLA_INFO_DATA
])
129 parse_rtattr_nested(greinfo
, IFLA_GRE_MAX
,
130 linkinfo
[IFLA_INFO_DATA
]);
132 rta
= greinfo
[IFLA_GRE_LOCAL
];
133 if (rta
&& get_addr_rta(&saddr
, rta
, AF_INET
))
136 rta
= greinfo
[IFLA_GRE_REMOTE
];
137 if (rta
&& get_addr_rta(&daddr
, rta
, AF_INET
))
140 if (greinfo
[IFLA_GRE_IKEY
])
141 ikey
= rta_getattr_u32(greinfo
[IFLA_GRE_IKEY
]);
143 if (greinfo
[IFLA_GRE_OKEY
])
144 okey
= rta_getattr_u32(greinfo
[IFLA_GRE_OKEY
]);
146 if (greinfo
[IFLA_GRE_IFLAGS
])
147 iflags
= rta_getattr_u16(greinfo
[IFLA_GRE_IFLAGS
]);
149 if (greinfo
[IFLA_GRE_OFLAGS
])
150 oflags
= rta_getattr_u16(greinfo
[IFLA_GRE_OFLAGS
]);
152 if (greinfo
[IFLA_GRE_PMTUDISC
])
153 pmtudisc
= rta_getattr_u8(
154 greinfo
[IFLA_GRE_PMTUDISC
]);
156 if (greinfo
[IFLA_GRE_IGNORE_DF
])
158 !!rta_getattr_u8(greinfo
[IFLA_GRE_IGNORE_DF
]);
160 if (greinfo
[IFLA_GRE_TOS
])
161 tos
= rta_getattr_u8(greinfo
[IFLA_GRE_TOS
]);
163 if (greinfo
[IFLA_GRE_TTL
])
164 ttl
= rta_getattr_u8(greinfo
[IFLA_GRE_TTL
]);
166 if (greinfo
[IFLA_GRE_LINK
])
167 link
= rta_getattr_u32(greinfo
[IFLA_GRE_LINK
]);
169 if (greinfo
[IFLA_GRE_ENCAP_TYPE
])
170 encaptype
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_TYPE
]);
172 if (greinfo
[IFLA_GRE_ENCAP_FLAGS
])
173 encapflags
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_FLAGS
]);
175 if (greinfo
[IFLA_GRE_ENCAP_SPORT
])
176 encapsport
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_SPORT
]);
178 if (greinfo
[IFLA_GRE_ENCAP_DPORT
])
179 encapdport
= rta_getattr_u16(greinfo
[IFLA_GRE_ENCAP_DPORT
]);
181 if (greinfo
[IFLA_GRE_COLLECT_METADATA
])
184 if (greinfo
[IFLA_GRE_FWMARK
])
185 fwmark
= rta_getattr_u32(greinfo
[IFLA_GRE_FWMARK
]);
187 if (greinfo
[IFLA_GRE_ERSPAN_INDEX
])
188 erspan_idx
= rta_getattr_u32(greinfo
[IFLA_GRE_ERSPAN_INDEX
]);
190 if (greinfo
[IFLA_GRE_ERSPAN_VER
])
191 erspan_ver
= rta_getattr_u8(greinfo
[IFLA_GRE_ERSPAN_VER
]);
193 if (greinfo
[IFLA_GRE_ERSPAN_DIR
])
194 erspan_dir
= rta_getattr_u8(greinfo
[IFLA_GRE_ERSPAN_DIR
]);
196 if (greinfo
[IFLA_GRE_ERSPAN_HWID
])
197 erspan_hwid
= rta_getattr_u16(greinfo
[IFLA_GRE_ERSPAN_HWID
]);
203 if (!matches(*argv
, "key")) {
207 ikey
= okey
= tnl_parse_key("key", *argv
);
208 } else if (!matches(*argv
, "nokey")) {
212 } else if (!matches(*argv
, "ikey")) {
215 ikey
= tnl_parse_key("ikey", *argv
);
216 } else if (!matches(*argv
, "noikey")) {
219 } else if (!matches(*argv
, "okey")) {
222 okey
= tnl_parse_key("okey", *argv
);
223 } else if (!matches(*argv
, "nookey")) {
226 } else if (!matches(*argv
, "seq")) {
229 } else if (!matches(*argv
, "noseq")) {
232 } else if (!matches(*argv
, "iseq")) {
234 } else if (!matches(*argv
, "noiseq")) {
236 } else if (!matches(*argv
, "oseq")) {
238 } else if (!matches(*argv
, "nooseq")) {
240 } else if (!matches(*argv
, "csum")) {
243 } else if (!matches(*argv
, "nocsum")) {
246 } else if (!matches(*argv
, "icsum")) {
248 } else if (!matches(*argv
, "noicsum")) {
250 } else if (!matches(*argv
, "ocsum")) {
252 } else if (!matches(*argv
, "noocsum")) {
254 } else if (!matches(*argv
, "nopmtudisc")) {
256 } else if (!matches(*argv
, "pmtudisc")) {
258 } else if (!matches(*argv
, "remote")) {
260 get_addr(&daddr
, *argv
, AF_INET
);
261 } else if (!matches(*argv
, "local")) {
263 get_addr(&saddr
, *argv
, AF_INET
);
264 } else if (!matches(*argv
, "dev")) {
266 link
= ll_name_to_index(*argv
);
269 } else if (!matches(*argv
, "ttl") ||
270 !matches(*argv
, "hoplimit") ||
271 !matches(*argv
, "hlim")) {
273 if (strcmp(*argv
, "inherit") != 0) {
274 if (get_u8(&ttl
, *argv
, 0))
275 invarg("invalid TTL\n", *argv
);
278 } else if (!matches(*argv
, "tos") ||
279 !matches(*argv
, "tclass") ||
280 !matches(*argv
, "dsfield")) {
284 if (strcmp(*argv
, "inherit") != 0) {
285 if (rtnl_dsfield_a2n(&uval
, *argv
))
286 invarg("bad TOS value", *argv
);
290 } else if (strcmp(*argv
, "noencap") == 0) {
291 encaptype
= TUNNEL_ENCAP_NONE
;
292 } else if (strcmp(*argv
, "encap") == 0) {
294 if (strcmp(*argv
, "fou") == 0)
295 encaptype
= TUNNEL_ENCAP_FOU
;
296 else if (strcmp(*argv
, "gue") == 0)
297 encaptype
= TUNNEL_ENCAP_GUE
;
298 else if (strcmp(*argv
, "none") == 0)
299 encaptype
= TUNNEL_ENCAP_NONE
;
301 invarg("Invalid encap type.", *argv
);
302 } else if (strcmp(*argv
, "encap-sport") == 0) {
304 if (strcmp(*argv
, "auto") == 0)
306 else if (get_u16(&encapsport
, *argv
, 0))
307 invarg("Invalid source port.", *argv
);
308 } else if (strcmp(*argv
, "encap-dport") == 0) {
310 if (get_u16(&encapdport
, *argv
, 0))
311 invarg("Invalid destination port.", *argv
);
312 } else if (strcmp(*argv
, "encap-csum") == 0) {
313 encapflags
|= TUNNEL_ENCAP_FLAG_CSUM
;
314 } else if (strcmp(*argv
, "noencap-csum") == 0) {
315 encapflags
&= ~TUNNEL_ENCAP_FLAG_CSUM
;
316 } else if (strcmp(*argv
, "encap-udp6-csum") == 0) {
317 encapflags
|= TUNNEL_ENCAP_FLAG_CSUM6
;
318 } else if (strcmp(*argv
, "noencap-udp6-csum") == 0) {
319 encapflags
&= ~TUNNEL_ENCAP_FLAG_CSUM6
;
320 } else if (strcmp(*argv
, "encap-remcsum") == 0) {
321 encapflags
|= TUNNEL_ENCAP_FLAG_REMCSUM
;
322 } else if (strcmp(*argv
, "noencap-remcsum") == 0) {
323 encapflags
&= ~TUNNEL_ENCAP_FLAG_REMCSUM
;
324 } else if (strcmp(*argv
, "external") == 0) {
326 } else if (strcmp(*argv
, "ignore-df") == 0) {
328 } else if (strcmp(*argv
, "noignore-df") == 0) {
330 *only the lsb is significant, use 2 for presence
333 } else if (strcmp(*argv
, "fwmark") == 0) {
335 if (get_u32(&fwmark
, *argv
, 0))
336 invarg("invalid fwmark\n", *argv
);
337 } else if (strcmp(*argv
, "erspan") == 0) {
339 if (get_u32(&erspan_idx
, *argv
, 0))
340 invarg("invalid erspan index\n", *argv
);
341 if (erspan_idx
& ~((1<<20) - 1) || erspan_idx
== 0)
342 invarg("erspan index must be > 0 and <= 20-bit\n", *argv
);
343 } else if (strcmp(*argv
, "erspan_ver") == 0) {
345 if (get_u8(&erspan_ver
, *argv
, 0))
346 invarg("invalid erspan version\n", *argv
);
347 if (erspan_ver
!= 1 && erspan_ver
!= 2)
348 invarg("erspan version must be 1 or 2\n", *argv
);
349 } else if (strcmp(*argv
, "erspan_dir") == 0) {
351 if (matches(*argv
, "ingress") == 0)
353 else if (matches(*argv
, "egress") == 0)
356 invarg("Invalid erspan direction.", *argv
);
357 } else if (strcmp(*argv
, "erspan_hwid") == 0) {
359 if (get_u16(&erspan_hwid
, *argv
, 0))
360 invarg("invalid erspan hwid\n", *argv
);
362 gre_print_help(lu
, argc
, argv
, stderr
);
368 if (is_addrtype_inet_multi(&daddr
)) {
370 ikey
= daddr
.data
[0];
374 okey
= daddr
.data
[0];
377 if (!is_addrtype_inet_not_unspec(&saddr
)) {
379 "A broadcast tunnel requires a source address.\n");
385 addattr_l(n
, 1024, IFLA_GRE_COLLECT_METADATA
, NULL
, 0);
389 addattr32(n
, 1024, IFLA_GRE_IKEY
, ikey
);
390 addattr32(n
, 1024, IFLA_GRE_OKEY
, okey
);
391 addattr_l(n
, 1024, IFLA_GRE_IFLAGS
, &iflags
, 2);
392 addattr_l(n
, 1024, IFLA_GRE_OFLAGS
, &oflags
, 2);
393 if (is_addrtype_inet_not_unspec(&saddr
))
394 addattr_l(n
, 1024, IFLA_GRE_LOCAL
, saddr
.data
, saddr
.bytelen
);
395 if (is_addrtype_inet_not_unspec(&daddr
))
396 addattr_l(n
, 1024, IFLA_GRE_REMOTE
, daddr
.data
, daddr
.bytelen
);
397 addattr_l(n
, 1024, IFLA_GRE_PMTUDISC
, &pmtudisc
, 1);
399 addattr8(n
, 1024, IFLA_GRE_IGNORE_DF
, ignore_df
& 1);
400 addattr_l(n
, 1024, IFLA_GRE_TOS
, &tos
, 1);
402 addattr32(n
, 1024, IFLA_GRE_LINK
, link
);
403 addattr_l(n
, 1024, IFLA_GRE_TTL
, &ttl
, 1);
404 addattr32(n
, 1024, IFLA_GRE_FWMARK
, fwmark
);
406 addattr8(n
, 1024, IFLA_GRE_ERSPAN_VER
, erspan_ver
);
407 if (erspan_ver
== 1 && erspan_idx
!= 0) {
408 addattr32(n
, 1024, IFLA_GRE_ERSPAN_INDEX
, erspan_idx
);
409 } else if (erspan_ver
== 2) {
410 addattr8(n
, 1024, IFLA_GRE_ERSPAN_DIR
, erspan_dir
);
411 addattr16(n
, 1024, IFLA_GRE_ERSPAN_HWID
, erspan_hwid
);
414 addattr16(n
, 1024, IFLA_GRE_ENCAP_TYPE
, encaptype
);
415 addattr16(n
, 1024, IFLA_GRE_ENCAP_FLAGS
, encapflags
);
416 addattr16(n
, 1024, IFLA_GRE_ENCAP_SPORT
, htons(encapsport
));
417 addattr16(n
, 1024, IFLA_GRE_ENCAP_DPORT
, htons(encapdport
));
422 static void gre_print_opt(struct link_util
*lu
, FILE *f
, struct rtattr
*tb
[])
433 if (tb
[IFLA_GRE_COLLECT_METADATA
]) {
434 print_bool(PRINT_ANY
, "external", "external ", true);
438 tnl_print_endpoint("remote", tb
[IFLA_GRE_REMOTE
], AF_INET
);
439 tnl_print_endpoint("local", tb
[IFLA_GRE_LOCAL
], AF_INET
);
441 if (tb
[IFLA_GRE_LINK
]) {
442 __u32 link
= rta_getattr_u32(tb
[IFLA_GRE_LINK
]);
445 print_string(PRINT_ANY
, "link", "dev %s ",
446 ll_index_to_name(link
));
450 if (tb
[IFLA_GRE_TTL
])
451 ttl
= rta_getattr_u8(tb
[IFLA_GRE_TTL
]);
452 if (is_json_context() || ttl
)
453 print_uint(PRINT_ANY
, "ttl", "ttl %u ", ttl
);
455 print_string(PRINT_FP
, NULL
, "ttl %s ", "inherit");
457 if (tb
[IFLA_GRE_TOS
])
458 tos
= rta_getattr_u8(tb
[IFLA_GRE_TOS
]);
460 if (is_json_context() || tos
!= 1)
461 print_0xhex(PRINT_ANY
, "tos", "tos %#llx ", tos
);
463 print_string(PRINT_FP
, NULL
, "tos %s ", "inherit");
466 if (tb
[IFLA_GRE_PMTUDISC
]) {
467 if (!rta_getattr_u8(tb
[IFLA_GRE_PMTUDISC
]))
468 print_bool(PRINT_ANY
, "pmtudisc", "nopmtudisc ", false);
470 print_bool(PRINT_JSON
, "pmtudisc", NULL
, true);
473 if (tb
[IFLA_GRE_IGNORE_DF
] && rta_getattr_u8(tb
[IFLA_GRE_IGNORE_DF
]))
474 print_bool(PRINT_ANY
, "ignore_df", "ignore-df ", true);
476 if (tb
[IFLA_GRE_IFLAGS
])
477 iflags
= rta_getattr_u16(tb
[IFLA_GRE_IFLAGS
]);
479 if (tb
[IFLA_GRE_OFLAGS
])
480 oflags
= rta_getattr_u16(tb
[IFLA_GRE_OFLAGS
]);
482 if ((iflags
& GRE_KEY
) && tb
[IFLA_GRE_IKEY
]) {
483 inet_ntop(AF_INET
, RTA_DATA(tb
[IFLA_GRE_IKEY
]), s2
, sizeof(s2
));
484 print_string(PRINT_ANY
, "ikey", "ikey %s ", s2
);
487 if ((oflags
& GRE_KEY
) && tb
[IFLA_GRE_OKEY
]) {
488 inet_ntop(AF_INET
, RTA_DATA(tb
[IFLA_GRE_OKEY
]), s2
, sizeof(s2
));
489 print_string(PRINT_ANY
, "okey", "okey %s ", s2
);
492 if (iflags
& GRE_SEQ
)
493 print_bool(PRINT_ANY
, "iseq", "iseq ", true);
494 if (oflags
& GRE_SEQ
)
495 print_bool(PRINT_ANY
, "oseq", "oseq ", true);
496 if (iflags
& GRE_CSUM
)
497 print_bool(PRINT_ANY
, "icsum", "icsum ", true);
498 if (oflags
& GRE_CSUM
)
499 print_bool(PRINT_ANY
, "ocsum", "ocsum ", true);
501 if (tb
[IFLA_GRE_FWMARK
]) {
502 __u32 fwmark
= rta_getattr_u32(tb
[IFLA_GRE_FWMARK
]);
505 print_0xhex(PRINT_ANY
,
506 "fwmark", "fwmark %#llx ", fwmark
);
510 if (tb
[IFLA_GRE_ERSPAN_INDEX
]) {
511 __u32 erspan_idx
= rta_getattr_u32(tb
[IFLA_GRE_ERSPAN_INDEX
]);
513 print_uint(PRINT_ANY
,
514 "erspan_index", "erspan_index %u ", erspan_idx
);
517 if (tb
[IFLA_GRE_ERSPAN_VER
]) {
518 __u8 erspan_ver
= rta_getattr_u8(tb
[IFLA_GRE_ERSPAN_VER
]);
520 print_uint(PRINT_ANY
,
521 "erspan_ver", "erspan_ver %u ", erspan_ver
);
524 if (tb
[IFLA_GRE_ERSPAN_DIR
]) {
525 __u8 erspan_dir
= rta_getattr_u8(tb
[IFLA_GRE_ERSPAN_DIR
]);
528 print_string(PRINT_ANY
, "erspan_dir",
529 "erspan_dir ingress ", NULL
);
531 print_string(PRINT_ANY
, "erspan_dir",
532 "erspan_dir egress ", NULL
);
535 if (tb
[IFLA_GRE_ERSPAN_HWID
]) {
536 __u16 erspan_hwid
= rta_getattr_u16(tb
[IFLA_GRE_ERSPAN_HWID
]);
538 print_0xhex(PRINT_ANY
,
539 "erspan_hwid", "erspan_hwid %#llx ", erspan_hwid
);
544 IFLA_GRE_ENCAP_FLAGS
,
545 IFLA_GRE_ENCAP_SPORT
,
546 IFLA_GRE_ENCAP_DPORT
);
549 struct link_util gre_link_util
= {
551 .maxattr
= IFLA_GRE_MAX
,
552 .parse_opt
= gre_parse_opt
,
553 .print_opt
= gre_print_opt
,
554 .print_help
= gre_print_help
,
557 struct link_util gretap_link_util
= {
559 .maxattr
= IFLA_GRE_MAX
,
560 .parse_opt
= gre_parse_opt
,
561 .print_opt
= gre_print_opt
,
562 .print_help
= gre_print_help
,
565 struct link_util erspan_link_util
= {
567 .maxattr
= IFLA_GRE_MAX
,
568 .parse_opt
= gre_parse_opt
,
569 .print_opt
= gre_print_opt
,
570 .print_help
= gre_print_help
,