1 /*
2 * lib/route/link/ipvti.c IPVTI Link Info
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2014 Susant Sahani <susant@redhat.com>
10 */
11
12 /**
13 * @ingroup link
14 * @defgroup ipvti IPVTI
15 * ipvti link module
16 *
17 * @details
18 * \b Link Type Name: "ipvti"
19 *
20 * @route_doc{link_ipvti, IPVTI Documentation}
21 *
22 * @{
23 */
24
25 #include <netlink-private/netlink.h>
26 #include <netlink/netlink.h>
27 #include <netlink/attr.h>
28 #include <netlink/utils.h>
29 #include <netlink/object.h>
30 #include <netlink/route/rtnl.h>
31 #include <netlink-private/route/link/api.h>
32 #include <linux/if_tunnel.h>
33
34 #define IPVTI_ATTR_LINK (1 << 0)
35 #define IPVTI_ATTR_IKEY (1 << 1)
36 #define IPVTI_ATTR_OKEY (1 << 2)
37 #define IPVTI_ATTR_LOCAL (1 << 3)
38 #define IPVTI_ATTR_REMOTE (1 << 4)
39
40 struct ipvti_info
41 {
42 uint32_t link;
43 uint32_t ikey;
44 uint32_t okey;
45 uint32_t local;
46 uint32_t remote;
47 uint32_t ipvti_mask;
48 };
49
50 static struct nla_policy ipvti_policy[IFLA_GRE_MAX + 1] = {
51 [IFLA_VTI_LINK] = { .type = NLA_U32 },
52 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
53 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
54 [IFLA_VTI_LOCAL] = { .type = NLA_U32 },
55 [IFLA_VTI_REMOTE] = { .type = NLA_U32 },
56 };
57
ipvti_alloc(struct rtnl_link * link)58 static int ipvti_alloc(struct rtnl_link *link)
59 {
60 struct ipvti_info *ipvti;
61
62 ipvti = calloc(1, sizeof(*ipvti));
63 if (!ipvti)
64 return -NLE_NOMEM;
65
66 link->l_info = ipvti;
67
68 return 0;
69 }
70
ipvti_parse(struct rtnl_link * link,struct nlattr * data,struct nlattr * xstats)71 static int ipvti_parse(struct rtnl_link *link, struct nlattr *data,
72 struct nlattr *xstats)
73 {
74 struct nlattr *tb[IFLA_IPTUN_MAX + 1];
75 struct ipvti_info *ipvti;
76 int err;
77
78 NL_DBG(3, "Parsing IPVTI link info");
79
80 err = nla_parse_nested(tb, IFLA_GRE_MAX, data, ipvti_policy);
81 if (err < 0)
82 goto errout;
83
84 err = ipvti_alloc(link);
85 if (err < 0)
86 goto errout;
87
88 ipvti = link->l_info;
89
90 if (tb[IFLA_VTI_LINK]) {
91 ipvti->link = nla_get_u32(tb[IFLA_VTI_LINK]);
92 ipvti->ipvti_mask |= IPVTI_ATTR_LINK;
93 }
94
95 if (tb[IFLA_VTI_IKEY]) {
96 ipvti->ikey = nla_get_u32(tb[IFLA_VTI_IKEY]);
97 ipvti->ipvti_mask |= IPVTI_ATTR_IKEY;
98 }
99
100 if (tb[IFLA_VTI_OKEY]) {
101 ipvti->okey = nla_get_u32(tb[IFLA_VTI_OKEY]);
102 ipvti->ipvti_mask |= IPVTI_ATTR_OKEY;
103 }
104
105 if (tb[IFLA_VTI_LOCAL]) {
106 ipvti->local = nla_get_u32(tb[IFLA_VTI_LOCAL]);
107 ipvti->ipvti_mask |= IPVTI_ATTR_LOCAL;
108 }
109
110 if (tb[IFLA_VTI_REMOTE]) {
111 ipvti->remote = nla_get_u32(tb[IFLA_VTI_REMOTE]);
112 ipvti->ipvti_mask |= IPVTI_ATTR_REMOTE;
113 }
114
115 err = 0;
116
117 errout:
118 return err;
119 }
120
ipvti_put_attrs(struct nl_msg * msg,struct rtnl_link * link)121 static int ipvti_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
122 {
123 struct ipvti_info *ipvti = link->l_info;
124 struct nlattr *data;
125
126 data = nla_nest_start(msg, IFLA_INFO_DATA);
127 if (!data)
128 return -NLE_MSGSIZE;
129
130 if (ipvti->ipvti_mask & IPVTI_ATTR_LINK)
131 NLA_PUT_U32(msg, IFLA_VTI_LINK, ipvti->link);
132
133 if (ipvti->ipvti_mask & IPVTI_ATTR_IKEY)
134 NLA_PUT_U32(msg, IFLA_VTI_IKEY, ipvti->ikey);
135
136 if (ipvti->ipvti_mask & IFLA_VTI_IKEY)
137 NLA_PUT_U32(msg, IFLA_VTI_OKEY, ipvti->okey);
138
139 if (ipvti->ipvti_mask & IPVTI_ATTR_LOCAL)
140 NLA_PUT_U32(msg, IFLA_VTI_LOCAL, ipvti->local);
141
142 if (ipvti->ipvti_mask & IPVTI_ATTR_REMOTE)
143 NLA_PUT_U32(msg, IFLA_VTI_REMOTE, ipvti->remote);
144
145 nla_nest_end(msg, data);
146
147 nla_put_failure:
148
149 return 0;
150 }
151
ipvti_free(struct rtnl_link * link)152 static void ipvti_free(struct rtnl_link *link)
153 {
154 struct ipvti_info *ipvti = link->l_info;
155
156 free(ipvti);
157 link->l_info = NULL;
158 }
159
ipvti_dump_line(struct rtnl_link * link,struct nl_dump_params * p)160 static void ipvti_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
161 {
162 nl_dump(p, "ipvti : %s", link->l_name);
163 }
164
ipvti_dump_details(struct rtnl_link * link,struct nl_dump_params * p)165 static void ipvti_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
166 {
167 struct ipvti_info *ipvti = link->l_info;
168 char *name, addr[INET_ADDRSTRLEN];
169
170 if (ipvti->ipvti_mask & IPVTI_ATTR_LINK) {
171 nl_dump(p, " link ");
172 name = rtnl_link_get_name(link);
173 if (name)
174 nl_dump_line(p, "%s\n", name);
175 else
176 nl_dump_line(p, "%u\n", ipvti->link);
177 }
178
179 if (ipvti->ipvti_mask & IPVTI_ATTR_IKEY) {
180 nl_dump(p, " ikey ");
181 nl_dump_line(p, "%x\n",ipvti->ikey);
182 }
183
184 if (ipvti->ipvti_mask & IPVTI_ATTR_OKEY) {
185 nl_dump(p, " okey ");
186 nl_dump_line(p, "%x\n", ipvti->okey);
187 }
188
189 if (ipvti->ipvti_mask & IPVTI_ATTR_LOCAL) {
190 nl_dump(p, " local ");
191 if(inet_ntop(AF_INET, &ipvti->local, addr, sizeof(addr)))
192 nl_dump_line(p, "%s\n", addr);
193 else
194 nl_dump_line(p, "%#x\n", ntohs(ipvti->local));
195 }
196
197 if (ipvti->ipvti_mask & IPVTI_ATTR_REMOTE) {
198 nl_dump(p, " remote ");
199 if(inet_ntop(AF_INET, &ipvti->remote, addr, sizeof(addr)))
200 nl_dump_line(p, "%s\n", addr);
201 else
202 nl_dump_line(p, "%#x\n", ntohs(ipvti->remote));
203 }
204 }
205
ipvti_clone(struct rtnl_link * dst,struct rtnl_link * src)206 static int ipvti_clone(struct rtnl_link *dst, struct rtnl_link *src)
207 {
208 struct ipvti_info *ipvti_dst, *ipvti_src = src->l_info;
209 int err;
210
211 dst->l_info = NULL;
212
213 err = rtnl_link_set_type(dst, "vti");
214 if (err < 0)
215 return err;
216
217 ipvti_dst = dst->l_info;
218
219 if (!ipvti_dst || !ipvti_src)
220 BUG();
221
222 memcpy(ipvti_dst, ipvti_src, sizeof(struct ipvti_info));
223
224 return 0;
225 }
226
227 static struct rtnl_link_info_ops ipvti_info_ops = {
228 .io_name = "vti",
229 .io_alloc = ipvti_alloc,
230 .io_parse = ipvti_parse,
231 .io_dump = {
232 [NL_DUMP_LINE] = ipvti_dump_line,
233 [NL_DUMP_DETAILS] = ipvti_dump_details,
234 },
235 .io_clone = ipvti_clone,
236 .io_put_attrs = ipvti_put_attrs,
237 .io_free = ipvti_free,
238 };
239
240 #define IS_IPVTI_LINK_ASSERT(link) \
241 if ((link)->l_info_ops != &ipvti_info_ops) { \
242 APPBUG("Link is not a ipvti link. set type \vti\" first."); \
243 return -NLE_OPNOTSUPP; \
244 }
245
rtnl_link_ipvti_alloc(void)246 struct rtnl_link *rtnl_link_ipvti_alloc(void)
247 {
248 struct rtnl_link *link;
249 int err;
250
251 link = rtnl_link_alloc();
252 if (!link)
253 return NULL;
254
255 err = rtnl_link_set_type(link, "vti");
256 if (err < 0) {
257 rtnl_link_put(link);
258 return NULL;
259 }
260
261 return link;
262 }
263
264 /**
265 * Check if link is a IPVTI link
266 * @arg link Link object
267 *
268 * @return True if link is a IPVTI link, otherwise 0 is returned.
269 */
rtnl_link_is_ipvti(struct rtnl_link * link)270 int rtnl_link_is_ipvti(struct rtnl_link *link)
271 {
272 return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "vti");
273 }
274 /**
275 * Create a new ipvti tunnel device
276 * @arg sock netlink socket
277 * @arg name name of the tunnel deviceL
278 *
279 * Creates a new ipvti tunnel device in the kernel
280 * @return 0 on success or a negative error code
281 */
rtnl_link_ipvti_add(struct nl_sock * sk,const char * name)282 int rtnl_link_ipvti_add(struct nl_sock *sk, const char *name)
283 {
284 struct rtnl_link *link;
285 int err;
286
287 link = rtnl_link_ipvti_alloc();
288 if (!link)
289 return -NLE_NOMEM;
290
291 if(name)
292 rtnl_link_set_name(link, name);
293
294 err = rtnl_link_add(sk, link, NLM_F_CREATE);
295 rtnl_link_put(link);
296
297 return err;
298 }
299 /**
300 * Set IPVTI tunnel interface index
301 * @arg link Link object
302 * @arg index interface index
303 *
304 * @return 0 on success or a negative error code
305 */
rtnl_link_ipvti_set_link(struct rtnl_link * link,uint32_t index)306 int rtnl_link_ipvti_set_link(struct rtnl_link *link, uint32_t index)
307 {
308 struct ipvti_info *ipvti = link->l_info;
309
310 IS_IPVTI_LINK_ASSERT(link);
311
312 ipvti->link = index;
313 ipvti->ipvti_mask |= IPVTI_ATTR_LINK;
314
315 return 0;
316 }
317
318 /**
319 * Get IPVTI tunnel interface index
320 * @arg link Link object
321 *
322 * @return interface index
323 */
rtnl_link_ipvti_get_link(struct rtnl_link * link)324 uint32_t rtnl_link_ipvti_get_link(struct rtnl_link *link)
325 {
326 struct ipvti_info *ipvti = link->l_info;
327
328 IS_IPVTI_LINK_ASSERT(link);
329
330 return ipvti->link;
331 }
332
333 /**
334 * Set IPVTI tunnel set ikey
335 * @arg link Link object
336 * @arg ikey gre ikey
337 *
338 * @return 0 on success or a negative error code
339 */
rtnl_link_ipvti_set_ikey(struct rtnl_link * link,uint32_t ikey)340 int rtnl_link_ipvti_set_ikey(struct rtnl_link *link, uint32_t ikey)
341 {
342 struct ipvti_info *ipvti = link->l_info;
343
344 IS_IPVTI_LINK_ASSERT(link);
345
346 ipvti->ikey = ikey;
347 ipvti->ipvti_mask |= IPVTI_ATTR_IKEY;
348
349 return 0;
350 }
351
352 /**
353 * Get IPVTI tunnel ikey
354 * @arg link Link object
355 *
356 * @return ikey
357 */
rtnl_link_ipvti_get_ikey(struct rtnl_link * link)358 uint32_t rtnl_link_ipvti_get_ikey(struct rtnl_link *link)
359 {
360 struct ipvti_info *ipvti = link->l_info;
361
362 IS_IPVTI_LINK_ASSERT(link);
363
364 return ipvti->ikey;
365 }
366
367 /**
368 * Set IPVTI tunnel set okey
369 * @arg link Link object
370 * @arg okey gre okey
371 *
372 * @return 0 on success or a negative error code
373 */
rtnl_link_ipvti_set_okey(struct rtnl_link * link,uint32_t okey)374 int rtnl_link_ipvti_set_okey(struct rtnl_link *link, uint32_t okey)
375 {
376 struct ipvti_info *ipvti = link->l_info;
377
378 IS_IPVTI_LINK_ASSERT(link);
379
380 ipvti->okey = okey;
381 ipvti->ipvti_mask |= IPVTI_ATTR_OKEY;
382
383 return 0;
384 }
385
386 /**
387 * Get IPVTI tunnel okey
388 * @arg link Link object
389 *
390 * @return okey value
391 */
rtnl_link_ipvti_get_okey(struct rtnl_link * link)392 uint32_t rtnl_link_ipvti_get_okey(struct rtnl_link *link)
393 {
394 struct ipvti_info *ipvti = link->l_info;
395
396 IS_IPVTI_LINK_ASSERT(link);
397
398 return ipvti->okey;
399 }
400
401 /**
402 * Set IPVTI tunnel local address
403 * @arg link Link object
404 * @arg addr local address
405 *
406 * @return 0 on success or a negative error code
407 */
rtnl_link_ipvti_set_local(struct rtnl_link * link,uint32_t addr)408 int rtnl_link_ipvti_set_local(struct rtnl_link *link, uint32_t addr)
409 {
410 struct ipvti_info *ipvti = link->l_info;
411
412 IS_IPVTI_LINK_ASSERT(link);
413
414 ipvti->local = addr;
415 ipvti->ipvti_mask |= IPVTI_ATTR_LOCAL;
416
417 return 0;
418 }
419
420 /**
421 * Get IPVTI tunnel local address
422 * @arg link Link object
423 *
424 * @return local address
425 */
rtnl_link_ipvti_get_local(struct rtnl_link * link)426 uint32_t rtnl_link_ipvti_get_local(struct rtnl_link *link)
427 {
428 struct ipvti_info *ipvti = link->l_info;
429
430 IS_IPVTI_LINK_ASSERT(link);
431
432 return ipvti->local;
433 }
434
435 /**
436 * Set IPVTI tunnel remote address
437 * @arg link Link object
438 * @arg remote remote address
439 *
440 * @return 0 on success or a negative error code
441 */
rtnl_link_ipvti_set_remote(struct rtnl_link * link,uint32_t remote)442 int rtnl_link_ipvti_set_remote(struct rtnl_link *link, uint32_t remote)
443 {
444 struct ipvti_info *ipvti = link->l_info;
445
446 IS_IPVTI_LINK_ASSERT(link);
447
448 ipvti->remote = remote;
449 ipvti->ipvti_mask |= IPVTI_ATTR_REMOTE;
450
451 return 0;
452 }
453
454 /**
455 * Get IPVTI tunnel remote address
456 * @arg link Link object
457 *
458 * @return remote address on success or a negative error code
459 */
rtnl_link_ipvti_get_remote(struct rtnl_link * link)460 uint32_t rtnl_link_ipvti_get_remote(struct rtnl_link *link)
461 {
462 struct ipvti_info *ipvti = link->l_info;
463
464 IS_IPVTI_LINK_ASSERT(link);
465
466 return ipvti->remote;
467 }
468
ipvti_init(void)469 static void __init ipvti_init(void)
470 {
471 rtnl_link_register_info(&ipvti_info_ops);
472 }
473
ipvti_exit(void)474 static void __exit ipvti_exit(void)
475 {
476 rtnl_link_unregister_info(&ipvti_info_ops);
477 }
478