Commit | Line | Data |
---|---|---|
ed1efb2a SK |
1 | /* |
2 | * IPv6 virtual tunneling interface | |
3 | * | |
4 | * Copyright (C) 2013 secunet Security Networks AG | |
5 | * | |
6 | * Author: | |
7 | * Steffen Klassert <steffen.klassert@secunet.com> | |
8 | * | |
9 | * Based on: | |
10 | * net/ipv6/ip6_tunnel.c | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/capability.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/icmp.h> | |
24 | #include <linux/if.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/ip.h> | |
ed1efb2a SK |
27 | #include <linux/net.h> |
28 | #include <linux/in6.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/icmpv6.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/route.h> | |
34 | #include <linux/rtnetlink.h> | |
35 | #include <linux/netfilter_ipv6.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/hash.h> | |
38 | ||
39 | #include <linux/uaccess.h> | |
40 | #include <linux/atomic.h> | |
41 | ||
42 | #include <net/icmp.h> | |
43 | #include <net/ip.h> | |
44 | #include <net/ip_tunnels.h> | |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <net/addrconf.h> | |
48 | #include <net/ip6_tunnel.h> | |
49 | #include <net/xfrm.h> | |
50 | #include <net/net_namespace.h> | |
51 | #include <net/netns/generic.h> | |
52 | ||
53 | #define HASH_SIZE_SHIFT 5 | |
54 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
55 | ||
56 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) | |
57 | { | |
58 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
59 | ||
60 | return hash_32(hash, HASH_SIZE_SHIFT); | |
61 | } | |
62 | ||
63 | static int vti6_dev_init(struct net_device *dev); | |
64 | static void vti6_dev_setup(struct net_device *dev); | |
65 | static struct rtnl_link_ops vti6_link_ops __read_mostly; | |
66 | ||
67 | static int vti6_net_id __read_mostly; | |
68 | struct vti6_net { | |
69 | /* the vti6 tunnel fallback device */ | |
70 | struct net_device *fb_tnl_dev; | |
71 | /* lists for storing tunnels in use */ | |
72 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; | |
73 | struct ip6_tnl __rcu *tnls_wc[1]; | |
74 | struct ip6_tnl __rcu **tnls[2]; | |
75 | }; | |
76 | ||
ed1efb2a SK |
77 | #define for_each_vti6_tunnel_rcu(start) \ |
78 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
79 | ||
80 | /** | |
81 | * vti6_tnl_lookup - fetch tunnel matching the end-point addresses | |
82 | * @net: network namespace | |
83 | * @remote: the address of the tunnel exit-point | |
84 | * @local: the address of the tunnel entry-point | |
85 | * | |
86 | * Return: | |
87 | * tunnel matching given end-points if found, | |
88 | * else fallback tunnel if its device is up, | |
89 | * else %NULL | |
90 | **/ | |
91 | static struct ip6_tnl * | |
92 | vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, | |
93 | const struct in6_addr *local) | |
94 | { | |
95 | unsigned int hash = HASH(remote, local); | |
96 | struct ip6_tnl *t; | |
97 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
fbe68ee8 | 98 | struct in6_addr any; |
ed1efb2a SK |
99 | |
100 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
101 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
102 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
103 | (t->dev->flags & IFF_UP)) | |
104 | return t; | |
105 | } | |
fbe68ee8 SK |
106 | |
107 | memset(&any, 0, sizeof(any)); | |
108 | hash = HASH(&any, local); | |
109 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
110 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
111 | (t->dev->flags & IFF_UP)) | |
112 | return t; | |
113 | } | |
114 | ||
115 | hash = HASH(remote, &any); | |
116 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
117 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
118 | (t->dev->flags & IFF_UP)) | |
119 | return t; | |
120 | } | |
121 | ||
ed1efb2a SK |
122 | t = rcu_dereference(ip6n->tnls_wc[0]); |
123 | if (t && (t->dev->flags & IFF_UP)) | |
124 | return t; | |
125 | ||
126 | return NULL; | |
127 | } | |
128 | ||
129 | /** | |
130 | * vti6_tnl_bucket - get head of list matching given tunnel parameters | |
131 | * @p: parameters containing tunnel end-points | |
132 | * | |
133 | * Description: | |
134 | * vti6_tnl_bucket() returns the head of the list matching the | |
135 | * &struct in6_addr entries laddr and raddr in @p. | |
136 | * | |
137 | * Return: head of IPv6 tunnel list | |
138 | **/ | |
139 | static struct ip6_tnl __rcu ** | |
140 | vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p) | |
141 | { | |
142 | const struct in6_addr *remote = &p->raddr; | |
143 | const struct in6_addr *local = &p->laddr; | |
144 | unsigned int h = 0; | |
145 | int prio = 0; | |
146 | ||
147 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
148 | prio = 1; | |
149 | h = HASH(remote, local); | |
150 | } | |
151 | return &ip6n->tnls[prio][h]; | |
152 | } | |
153 | ||
154 | static void | |
155 | vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t) | |
156 | { | |
157 | struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms); | |
158 | ||
159 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); | |
160 | rcu_assign_pointer(*tp, t); | |
161 | } | |
162 | ||
163 | static void | |
164 | vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t) | |
165 | { | |
166 | struct ip6_tnl __rcu **tp; | |
167 | struct ip6_tnl *iter; | |
168 | ||
169 | for (tp = vti6_tnl_bucket(ip6n, &t->parms); | |
170 | (iter = rtnl_dereference(*tp)) != NULL; | |
171 | tp = &iter->next) { | |
172 | if (t == iter) { | |
173 | rcu_assign_pointer(*tp, t->next); | |
174 | break; | |
175 | } | |
176 | } | |
177 | } | |
178 | ||
179 | static void vti6_dev_free(struct net_device *dev) | |
180 | { | |
181 | free_percpu(dev->tstats); | |
182 | free_netdev(dev); | |
183 | } | |
184 | ||
185 | static int vti6_tnl_create2(struct net_device *dev) | |
186 | { | |
187 | struct ip6_tnl *t = netdev_priv(dev); | |
188 | struct net *net = dev_net(dev); | |
189 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
190 | int err; | |
191 | ||
ed1efb2a SK |
192 | err = register_netdevice(dev); |
193 | if (err < 0) | |
194 | goto out; | |
195 | ||
196 | strcpy(t->parms.name, dev->name); | |
197 | dev->rtnl_link_ops = &vti6_link_ops; | |
198 | ||
199 | dev_hold(dev); | |
200 | vti6_tnl_link(ip6n, t); | |
201 | ||
202 | return 0; | |
203 | ||
204 | out: | |
205 | return err; | |
206 | } | |
207 | ||
208 | static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) | |
209 | { | |
210 | struct net_device *dev; | |
211 | struct ip6_tnl *t; | |
212 | char name[IFNAMSIZ]; | |
213 | int err; | |
214 | ||
215 | if (p->name[0]) | |
216 | strlcpy(name, p->name, IFNAMSIZ); | |
217 | else | |
218 | sprintf(name, "ip6_vti%%d"); | |
219 | ||
c835a677 | 220 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup); |
ed1efb2a SK |
221 | if (dev == NULL) |
222 | goto failed; | |
223 | ||
224 | dev_net_set(dev, net); | |
225 | ||
226 | t = netdev_priv(dev); | |
227 | t->parms = *p; | |
228 | t->net = dev_net(dev); | |
229 | ||
230 | err = vti6_tnl_create2(dev); | |
231 | if (err < 0) | |
232 | goto failed_free; | |
233 | ||
234 | return t; | |
235 | ||
236 | failed_free: | |
237 | vti6_dev_free(dev); | |
238 | failed: | |
239 | return NULL; | |
240 | } | |
241 | ||
242 | /** | |
243 | * vti6_locate - find or create tunnel matching given parameters | |
244 | * @net: network namespace | |
245 | * @p: tunnel parameters | |
246 | * @create: != 0 if allowed to create new tunnel if no match found | |
247 | * | |
248 | * Description: | |
249 | * vti6_locate() first tries to locate an existing tunnel | |
250 | * based on @parms. If this is unsuccessful, but @create is set a new | |
251 | * tunnel device is created and registered for use. | |
252 | * | |
253 | * Return: | |
254 | * matching tunnel or NULL | |
255 | **/ | |
256 | static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p, | |
257 | int create) | |
258 | { | |
259 | const struct in6_addr *remote = &p->raddr; | |
260 | const struct in6_addr *local = &p->laddr; | |
261 | struct ip6_tnl __rcu **tp; | |
262 | struct ip6_tnl *t; | |
263 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
264 | ||
265 | for (tp = vti6_tnl_bucket(ip6n, p); | |
266 | (t = rtnl_dereference(*tp)) != NULL; | |
267 | tp = &t->next) { | |
268 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
d814b847 SK |
269 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
270 | if (create) | |
271 | return NULL; | |
272 | ||
ed1efb2a | 273 | return t; |
d814b847 | 274 | } |
ed1efb2a SK |
275 | } |
276 | if (!create) | |
277 | return NULL; | |
278 | return vti6_tnl_create(net, p); | |
279 | } | |
280 | ||
281 | /** | |
282 | * vti6_dev_uninit - tunnel device uninitializer | |
283 | * @dev: the device to be destroyed | |
284 | * | |
285 | * Description: | |
286 | * vti6_dev_uninit() removes tunnel from its list | |
287 | **/ | |
288 | static void vti6_dev_uninit(struct net_device *dev) | |
289 | { | |
290 | struct ip6_tnl *t = netdev_priv(dev); | |
291 | struct net *net = dev_net(dev); | |
292 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
293 | ||
294 | if (dev == ip6n->fb_tnl_dev) | |
295 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); | |
296 | else | |
297 | vti6_tnl_unlink(ip6n, t); | |
ed1efb2a SK |
298 | dev_put(dev); |
299 | } | |
300 | ||
301 | static int vti6_rcv(struct sk_buff *skb) | |
302 | { | |
303 | struct ip6_tnl *t; | |
304 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
305 | ||
306 | rcu_read_lock(); | |
e5d08d71 IM |
307 | t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
308 | if (t != NULL) { | |
ed1efb2a SK |
309 | if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { |
310 | rcu_read_unlock(); | |
311 | goto discard; | |
312 | } | |
313 | ||
314 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
315 | rcu_read_unlock(); | |
316 | return 0; | |
317 | } | |
318 | ||
319 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { | |
320 | t->dev->stats.rx_dropped++; | |
321 | rcu_read_unlock(); | |
322 | goto discard; | |
323 | } | |
324 | ||
fa9ad96d SK |
325 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
326 | skb->mark = be32_to_cpu(t->parms.i_key); | |
ed1efb2a SK |
327 | |
328 | rcu_read_unlock(); | |
fa9ad96d SK |
329 | |
330 | return xfrm6_rcv(skb); | |
ed1efb2a SK |
331 | } |
332 | rcu_read_unlock(); | |
fa9ad96d | 333 | return -EINVAL; |
ed1efb2a SK |
334 | discard: |
335 | kfree_skb(skb); | |
336 | return 0; | |
337 | } | |
338 | ||
fa9ad96d SK |
339 | static int vti6_rcv_cb(struct sk_buff *skb, int err) |
340 | { | |
341 | unsigned short family; | |
342 | struct net_device *dev; | |
343 | struct pcpu_sw_netstats *tstats; | |
344 | struct xfrm_state *x; | |
345 | struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; | |
346 | ||
347 | if (!t) | |
348 | return 1; | |
349 | ||
350 | dev = t->dev; | |
351 | ||
352 | if (err) { | |
353 | dev->stats.rx_errors++; | |
354 | dev->stats.rx_dropped++; | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | x = xfrm_input_state(skb); | |
360 | family = x->inner_mode->afinfo->family; | |
361 | ||
362 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family)) | |
363 | return -EPERM; | |
364 | ||
365 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); | |
366 | skb->dev = dev; | |
367 | ||
368 | tstats = this_cpu_ptr(dev->tstats); | |
369 | u64_stats_update_begin(&tstats->syncp); | |
370 | tstats->rx_packets++; | |
371 | tstats->rx_bytes += skb->len; | |
372 | u64_stats_update_end(&tstats->syncp); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
ed1efb2a SK |
377 | /** |
378 | * vti6_addr_conflict - compare packet addresses to tunnel's own | |
379 | * @t: the outgoing tunnel device | |
380 | * @hdr: IPv6 header from the incoming packet | |
381 | * | |
382 | * Description: | |
383 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
384 | * doesn't match source of incoming packet. | |
385 | * | |
386 | * Return: | |
387 | * 1 if conflict, | |
388 | * 0 else | |
389 | **/ | |
390 | static inline bool | |
391 | vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) | |
392 | { | |
393 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
394 | } | |
395 | ||
26be8e2d SK |
396 | static bool vti6_state_check(const struct xfrm_state *x, |
397 | const struct in6_addr *dst, | |
398 | const struct in6_addr *src) | |
399 | { | |
400 | xfrm_address_t *daddr = (xfrm_address_t *)dst; | |
401 | xfrm_address_t *saddr = (xfrm_address_t *)src; | |
402 | ||
403 | /* if there is no transform then this tunnel is not functional. | |
404 | * Or if the xfrm is not mode tunnel. | |
405 | */ | |
406 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
407 | x->props.family != AF_INET6) | |
408 | return false; | |
409 | ||
410 | if (ipv6_addr_any(dst)) | |
411 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); | |
412 | ||
413 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) | |
414 | return false; | |
415 | ||
416 | return true; | |
417 | } | |
418 | ||
ed1efb2a SK |
419 | /** |
420 | * vti6_xmit - send a packet | |
421 | * @skb: the outgoing socket buffer | |
422 | * @dev: the outgoing tunnel device | |
22e1b23d | 423 | * @fl: the flow informations for the xfrm_lookup |
ed1efb2a | 424 | **/ |
22e1b23d SK |
425 | static int |
426 | vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
ed1efb2a | 427 | { |
ed1efb2a SK |
428 | struct ip6_tnl *t = netdev_priv(dev); |
429 | struct net_device_stats *stats = &t->dev->stats; | |
7c852581 | 430 | struct dst_entry *dst = skb_dst(skb); |
ed1efb2a | 431 | struct net_device *tdev; |
d5005140 | 432 | struct xfrm_state *x; |
ed1efb2a SK |
433 | int err = -1; |
434 | ||
7c852581 SK |
435 | if (!dst) |
436 | goto tx_err_link_failure; | |
ed1efb2a | 437 | |
7c852581 | 438 | dst_hold(dst); |
22e1b23d | 439 | dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
7c852581 SK |
440 | if (IS_ERR(dst)) { |
441 | err = PTR_ERR(dst); | |
442 | dst = NULL; | |
443 | goto tx_err_link_failure; | |
ed1efb2a SK |
444 | } |
445 | ||
d5005140 SK |
446 | x = dst->xfrm; |
447 | if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) | |
448 | goto tx_err_link_failure; | |
449 | ||
450 | if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, | |
451 | (const struct in6_addr *)&x->id.daddr)) | |
ed1efb2a SK |
452 | goto tx_err_link_failure; |
453 | ||
454 | tdev = dst->dev; | |
455 | ||
456 | if (tdev == dev) { | |
457 | stats->collisions++; | |
458 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
459 | t->parms.name); | |
460 | goto tx_err_dst_release; | |
461 | } | |
462 | ||
7c852581 SK |
463 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
464 | skb_dst_set(skb, dst); | |
465 | skb->dev = skb_dst(skb)->dev; | |
ed1efb2a | 466 | |
22e1b23d SK |
467 | err = dst_output(skb); |
468 | if (net_xmit_eval(err) == 0) { | |
469 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
470 | ||
471 | u64_stats_update_begin(&tstats->syncp); | |
472 | tstats->tx_bytes += skb->len; | |
473 | tstats->tx_packets++; | |
474 | u64_stats_update_end(&tstats->syncp); | |
475 | } else { | |
476 | stats->tx_errors++; | |
477 | stats->tx_aborted_errors++; | |
478 | } | |
ed1efb2a SK |
479 | |
480 | return 0; | |
481 | tx_err_link_failure: | |
482 | stats->tx_carrier_errors++; | |
483 | dst_link_failure(skb); | |
484 | tx_err_dst_release: | |
7c852581 | 485 | dst_release(dst); |
ed1efb2a SK |
486 | return err; |
487 | } | |
488 | ||
489 | static netdev_tx_t | |
490 | vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
491 | { | |
492 | struct ip6_tnl *t = netdev_priv(dev); | |
493 | struct net_device_stats *stats = &t->dev->stats; | |
22e1b23d SK |
494 | struct ipv6hdr *ipv6h; |
495 | struct flowi fl; | |
ed1efb2a SK |
496 | int ret; |
497 | ||
22e1b23d SK |
498 | memset(&fl, 0, sizeof(fl)); |
499 | skb->mark = be32_to_cpu(t->parms.o_key); | |
500 | ||
ed1efb2a SK |
501 | switch (skb->protocol) { |
502 | case htons(ETH_P_IPV6): | |
22e1b23d SK |
503 | ipv6h = ipv6_hdr(skb); |
504 | ||
505 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || | |
d5005140 | 506 | vti6_addr_conflict(t, ipv6h)) |
22e1b23d SK |
507 | goto tx_err; |
508 | ||
509 | xfrm_decode_session(skb, &fl, AF_INET6); | |
510 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
511 | break; | |
512 | case htons(ETH_P_IP): | |
513 | xfrm_decode_session(skb, &fl, AF_INET); | |
514 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
ed1efb2a SK |
515 | break; |
516 | default: | |
517 | goto tx_err; | |
518 | } | |
519 | ||
22e1b23d | 520 | ret = vti6_xmit(skb, dev, &fl); |
ed1efb2a SK |
521 | if (ret < 0) |
522 | goto tx_err; | |
523 | ||
524 | return NETDEV_TX_OK; | |
525 | ||
526 | tx_err: | |
527 | stats->tx_errors++; | |
528 | stats->tx_dropped++; | |
529 | kfree_skb(skb); | |
530 | return NETDEV_TX_OK; | |
531 | } | |
532 | ||
fa9ad96d SK |
533 | static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
534 | u8 type, u8 code, int offset, __be32 info) | |
535 | { | |
536 | __be32 spi; | |
6d004d6c | 537 | __u32 mark; |
fa9ad96d SK |
538 | struct xfrm_state *x; |
539 | struct ip6_tnl *t; | |
540 | struct ip_esp_hdr *esph; | |
541 | struct ip_auth_hdr *ah; | |
542 | struct ip_comp_hdr *ipch; | |
543 | struct net *net = dev_net(skb->dev); | |
544 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
545 | int protocol = iph->nexthdr; | |
546 | ||
547 | t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); | |
548 | if (!t) | |
549 | return -1; | |
550 | ||
6d004d6c SK |
551 | mark = be32_to_cpu(t->parms.o_key); |
552 | ||
fa9ad96d SK |
553 | switch (protocol) { |
554 | case IPPROTO_ESP: | |
555 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
556 | spi = esph->spi; | |
557 | break; | |
558 | case IPPROTO_AH: | |
559 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
560 | spi = ah->spi; | |
561 | break; | |
562 | case IPPROTO_COMP: | |
563 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
564 | spi = htonl(ntohs(ipch->cpi)); | |
565 | break; | |
566 | default: | |
567 | return 0; | |
568 | } | |
569 | ||
570 | if (type != ICMPV6_PKT_TOOBIG && | |
571 | type != NDISC_REDIRECT) | |
572 | return 0; | |
573 | ||
6d004d6c | 574 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
fa9ad96d SK |
575 | spi, protocol, AF_INET6); |
576 | if (!x) | |
577 | return 0; | |
578 | ||
579 | if (type == NDISC_REDIRECT) | |
580 | ip6_redirect(skb, net, skb->dev->ifindex, 0); | |
581 | else | |
582 | ip6_update_pmtu(skb, net, info, 0, 0); | |
583 | xfrm_state_put(x); | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
ed1efb2a SK |
588 | static void vti6_link_config(struct ip6_tnl *t) |
589 | { | |
ed1efb2a SK |
590 | struct net_device *dev = t->dev; |
591 | struct __ip6_tnl_parm *p = &t->parms; | |
ed1efb2a SK |
592 | |
593 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
594 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
595 | ||
ed1efb2a SK |
596 | p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
597 | IP6_TNL_F_CAP_PER_PACKET); | |
598 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
599 | ||
600 | if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) | |
601 | dev->flags |= IFF_POINTOPOINT; | |
602 | else | |
603 | dev->flags &= ~IFF_POINTOPOINT; | |
604 | ||
605 | dev->iflink = p->link; | |
ed1efb2a SK |
606 | } |
607 | ||
608 | /** | |
609 | * vti6_tnl_change - update the tunnel parameters | |
610 | * @t: tunnel to be changed | |
611 | * @p: tunnel configuration parameters | |
612 | * | |
613 | * Description: | |
614 | * vti6_tnl_change() updates the tunnel parameters | |
615 | **/ | |
616 | static int | |
617 | vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) | |
618 | { | |
619 | t->parms.laddr = p->laddr; | |
620 | t->parms.raddr = p->raddr; | |
621 | t->parms.link = p->link; | |
622 | t->parms.i_key = p->i_key; | |
623 | t->parms.o_key = p->o_key; | |
624 | t->parms.proto = p->proto; | |
625 | ip6_tnl_dst_reset(t); | |
626 | vti6_link_config(t); | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) | |
631 | { | |
632 | struct net *net = dev_net(t->dev); | |
633 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
634 | int err; | |
635 | ||
636 | vti6_tnl_unlink(ip6n, t); | |
637 | synchronize_net(); | |
638 | err = vti6_tnl_change(t, p); | |
639 | vti6_tnl_link(ip6n, t); | |
640 | netdev_state_change(t->dev); | |
641 | return err; | |
642 | } | |
643 | ||
644 | static void | |
645 | vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) | |
646 | { | |
647 | p->laddr = u->laddr; | |
648 | p->raddr = u->raddr; | |
649 | p->link = u->link; | |
650 | p->i_key = u->i_key; | |
651 | p->o_key = u->o_key; | |
652 | p->proto = u->proto; | |
653 | ||
654 | memcpy(p->name, u->name, sizeof(u->name)); | |
655 | } | |
656 | ||
657 | static void | |
658 | vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) | |
659 | { | |
660 | u->laddr = p->laddr; | |
661 | u->raddr = p->raddr; | |
662 | u->link = p->link; | |
663 | u->i_key = p->i_key; | |
664 | u->o_key = p->o_key; | |
665 | u->proto = p->proto; | |
666 | ||
667 | memcpy(u->name, p->name, sizeof(u->name)); | |
668 | } | |
669 | ||
670 | /** | |
671 | * vti6_tnl_ioctl - configure vti6 tunnels from userspace | |
672 | * @dev: virtual device associated with tunnel | |
673 | * @ifr: parameters passed from userspace | |
674 | * @cmd: command to be performed | |
675 | * | |
676 | * Description: | |
677 | * vti6_ioctl() is used for managing vti6 tunnels | |
678 | * from userspace. | |
679 | * | |
680 | * The possible commands are the following: | |
681 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
682 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
683 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
684 | * %SIOCDELTUNNEL: delete tunnel | |
685 | * | |
686 | * The fallback device "ip6_vti0", created during module | |
687 | * initialization, can be used for creating other tunnel devices. | |
688 | * | |
689 | * Return: | |
690 | * 0 on success, | |
691 | * %-EFAULT if unable to copy data to or from userspace, | |
692 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
693 | * %-EINVAL if passed tunnel parameters are invalid, | |
694 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
695 | * %-ENODEV if attempting to change or delete a nonexisting device | |
696 | **/ | |
697 | static int | |
698 | vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
699 | { | |
700 | int err = 0; | |
701 | struct ip6_tnl_parm2 p; | |
702 | struct __ip6_tnl_parm p1; | |
703 | struct ip6_tnl *t = NULL; | |
704 | struct net *net = dev_net(dev); | |
705 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
706 | ||
707 | switch (cmd) { | |
708 | case SIOCGETTUNNEL: | |
709 | if (dev == ip6n->fb_tnl_dev) { | |
710 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
711 | err = -EFAULT; | |
712 | break; | |
713 | } | |
714 | vti6_parm_from_user(&p1, &p); | |
715 | t = vti6_locate(net, &p1, 0); | |
716 | } else { | |
717 | memset(&p, 0, sizeof(p)); | |
718 | } | |
719 | if (t == NULL) | |
720 | t = netdev_priv(dev); | |
721 | vti6_parm_to_user(&p, &t->parms); | |
722 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
723 | err = -EFAULT; | |
724 | break; | |
725 | case SIOCADDTUNNEL: | |
726 | case SIOCCHGTUNNEL: | |
727 | err = -EPERM; | |
728 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
729 | break; | |
730 | err = -EFAULT; | |
731 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
732 | break; | |
733 | err = -EINVAL; | |
734 | if (p.proto != IPPROTO_IPV6 && p.proto != 0) | |
735 | break; | |
736 | vti6_parm_from_user(&p1, &p); | |
737 | t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
738 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
739 | if (t != NULL) { | |
740 | if (t->dev != dev) { | |
741 | err = -EEXIST; | |
742 | break; | |
743 | } | |
744 | } else | |
745 | t = netdev_priv(dev); | |
746 | ||
747 | err = vti6_update(t, &p1); | |
748 | } | |
749 | if (t) { | |
750 | err = 0; | |
751 | vti6_parm_to_user(&p, &t->parms); | |
752 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
753 | err = -EFAULT; | |
754 | ||
755 | } else | |
756 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
757 | break; | |
758 | case SIOCDELTUNNEL: | |
759 | err = -EPERM; | |
760 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
761 | break; | |
762 | ||
763 | if (dev == ip6n->fb_tnl_dev) { | |
764 | err = -EFAULT; | |
765 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
766 | break; | |
767 | err = -ENOENT; | |
768 | vti6_parm_from_user(&p1, &p); | |
769 | t = vti6_locate(net, &p1, 0); | |
770 | if (t == NULL) | |
771 | break; | |
772 | err = -EPERM; | |
773 | if (t->dev == ip6n->fb_tnl_dev) | |
774 | break; | |
775 | dev = t->dev; | |
776 | } | |
777 | err = 0; | |
778 | unregister_netdevice(dev); | |
779 | break; | |
780 | default: | |
781 | err = -EINVAL; | |
782 | } | |
783 | return err; | |
784 | } | |
785 | ||
786 | /** | |
787 | * vti6_tnl_change_mtu - change mtu manually for tunnel device | |
788 | * @dev: virtual device associated with tunnel | |
789 | * @new_mtu: the new mtu | |
790 | * | |
791 | * Return: | |
792 | * 0 on success, | |
793 | * %-EINVAL if mtu too small | |
794 | **/ | |
795 | static int vti6_change_mtu(struct net_device *dev, int new_mtu) | |
796 | { | |
797 | if (new_mtu < IPV6_MIN_MTU) | |
798 | return -EINVAL; | |
799 | ||
800 | dev->mtu = new_mtu; | |
801 | return 0; | |
802 | } | |
803 | ||
804 | static const struct net_device_ops vti6_netdev_ops = { | |
16a0231b | 805 | .ndo_init = vti6_dev_init, |
ed1efb2a SK |
806 | .ndo_uninit = vti6_dev_uninit, |
807 | .ndo_start_xmit = vti6_tnl_xmit, | |
808 | .ndo_do_ioctl = vti6_ioctl, | |
809 | .ndo_change_mtu = vti6_change_mtu, | |
469bdcef | 810 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ed1efb2a SK |
811 | }; |
812 | ||
813 | /** | |
814 | * vti6_dev_setup - setup virtual tunnel device | |
815 | * @dev: virtual device associated with tunnel | |
816 | * | |
817 | * Description: | |
818 | * Initialize function pointers and device parameters | |
819 | **/ | |
820 | static void vti6_dev_setup(struct net_device *dev) | |
821 | { | |
ed1efb2a SK |
822 | dev->netdev_ops = &vti6_netdev_ops; |
823 | dev->destructor = vti6_dev_free; | |
824 | ||
825 | dev->type = ARPHRD_TUNNEL6; | |
826 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); | |
827 | dev->mtu = ETH_DATA_LEN; | |
ed1efb2a SK |
828 | dev->flags |= IFF_NOARP; |
829 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 830 | netif_keep_dst(dev); |
ed1efb2a SK |
831 | } |
832 | ||
833 | /** | |
834 | * vti6_dev_init_gen - general initializer for all tunnel devices | |
835 | * @dev: virtual device associated with tunnel | |
836 | **/ | |
837 | static inline int vti6_dev_init_gen(struct net_device *dev) | |
838 | { | |
839 | struct ip6_tnl *t = netdev_priv(dev); | |
840 | ||
841 | t->dev = dev; | |
842 | t->net = dev_net(dev); | |
1c213bd2 | 843 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
ed1efb2a SK |
844 | if (!dev->tstats) |
845 | return -ENOMEM; | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /** | |
850 | * vti6_dev_init - initializer for all non fallback tunnel devices | |
851 | * @dev: virtual device associated with tunnel | |
852 | **/ | |
853 | static int vti6_dev_init(struct net_device *dev) | |
854 | { | |
855 | struct ip6_tnl *t = netdev_priv(dev); | |
856 | int err = vti6_dev_init_gen(dev); | |
857 | ||
858 | if (err) | |
859 | return err; | |
860 | vti6_link_config(t); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | /** | |
865 | * vti6_fb_tnl_dev_init - initializer for fallback tunnel device | |
866 | * @dev: fallback device | |
867 | * | |
868 | * Return: 0 | |
869 | **/ | |
870 | static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) | |
871 | { | |
872 | struct ip6_tnl *t = netdev_priv(dev); | |
873 | struct net *net = dev_net(dev); | |
874 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
ed1efb2a SK |
875 | |
876 | t->parms.proto = IPPROTO_IPV6; | |
877 | dev_hold(dev); | |
878 | ||
ed1efb2a SK |
879 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
880 | return 0; | |
881 | } | |
882 | ||
883 | static int vti6_validate(struct nlattr *tb[], struct nlattr *data[]) | |
884 | { | |
885 | return 0; | |
886 | } | |
887 | ||
888 | static void vti6_netlink_parms(struct nlattr *data[], | |
889 | struct __ip6_tnl_parm *parms) | |
890 | { | |
891 | memset(parms, 0, sizeof(*parms)); | |
892 | ||
893 | if (!data) | |
894 | return; | |
895 | ||
896 | if (data[IFLA_VTI_LINK]) | |
897 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
898 | ||
899 | if (data[IFLA_VTI_LOCAL]) | |
900 | nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL], | |
901 | sizeof(struct in6_addr)); | |
902 | ||
903 | if (data[IFLA_VTI_REMOTE]) | |
904 | nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE], | |
905 | sizeof(struct in6_addr)); | |
906 | ||
907 | if (data[IFLA_VTI_IKEY]) | |
908 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
909 | ||
910 | if (data[IFLA_VTI_OKEY]) | |
911 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
912 | } | |
913 | ||
914 | static int vti6_newlink(struct net *src_net, struct net_device *dev, | |
915 | struct nlattr *tb[], struct nlattr *data[]) | |
916 | { | |
917 | struct net *net = dev_net(dev); | |
918 | struct ip6_tnl *nt; | |
919 | ||
920 | nt = netdev_priv(dev); | |
921 | vti6_netlink_parms(data, &nt->parms); | |
922 | ||
923 | nt->parms.proto = IPPROTO_IPV6; | |
924 | ||
925 | if (vti6_locate(net, &nt->parms, 0)) | |
926 | return -EEXIST; | |
927 | ||
928 | return vti6_tnl_create2(dev); | |
929 | } | |
930 | ||
20ea60ca | 931 | static void vti6_dellink(struct net_device *dev, struct list_head *head) |
932 | { | |
933 | struct net *net = dev_net(dev); | |
934 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
935 | ||
936 | if (dev != ip6n->fb_tnl_dev) | |
937 | unregister_netdevice_queue(dev, head); | |
938 | } | |
939 | ||
ed1efb2a SK |
940 | static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], |
941 | struct nlattr *data[]) | |
942 | { | |
943 | struct ip6_tnl *t; | |
944 | struct __ip6_tnl_parm p; | |
945 | struct net *net = dev_net(dev); | |
946 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
947 | ||
948 | if (dev == ip6n->fb_tnl_dev) | |
949 | return -EINVAL; | |
950 | ||
951 | vti6_netlink_parms(data, &p); | |
952 | ||
953 | t = vti6_locate(net, &p, 0); | |
954 | ||
955 | if (t) { | |
956 | if (t->dev != dev) | |
957 | return -EEXIST; | |
958 | } else | |
959 | t = netdev_priv(dev); | |
960 | ||
961 | return vti6_update(t, &p); | |
962 | } | |
963 | ||
964 | static size_t vti6_get_size(const struct net_device *dev) | |
965 | { | |
966 | return | |
967 | /* IFLA_VTI_LINK */ | |
968 | nla_total_size(4) + | |
969 | /* IFLA_VTI_LOCAL */ | |
970 | nla_total_size(sizeof(struct in6_addr)) + | |
971 | /* IFLA_VTI_REMOTE */ | |
972 | nla_total_size(sizeof(struct in6_addr)) + | |
973 | /* IFLA_VTI_IKEY */ | |
974 | nla_total_size(4) + | |
975 | /* IFLA_VTI_OKEY */ | |
976 | nla_total_size(4) + | |
977 | 0; | |
978 | } | |
979 | ||
980 | static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
981 | { | |
982 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
983 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
984 | ||
985 | if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || | |
986 | nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr), | |
987 | &parm->laddr) || | |
988 | nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr), | |
989 | &parm->raddr) || | |
990 | nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || | |
991 | nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key)) | |
992 | goto nla_put_failure; | |
993 | return 0; | |
994 | ||
995 | nla_put_failure: | |
996 | return -EMSGSIZE; | |
997 | } | |
998 | ||
999 | static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { | |
1000 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
1001 | [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1002 | [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1003 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
1004 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
1005 | }; | |
1006 | ||
1007 | static struct rtnl_link_ops vti6_link_ops __read_mostly = { | |
1008 | .kind = "vti6", | |
1009 | .maxtype = IFLA_VTI_MAX, | |
1010 | .policy = vti6_policy, | |
1011 | .priv_size = sizeof(struct ip6_tnl), | |
1012 | .setup = vti6_dev_setup, | |
1013 | .validate = vti6_validate, | |
1014 | .newlink = vti6_newlink, | |
20ea60ca | 1015 | .dellink = vti6_dellink, |
ed1efb2a SK |
1016 | .changelink = vti6_changelink, |
1017 | .get_size = vti6_get_size, | |
1018 | .fill_info = vti6_fill_info, | |
1019 | }; | |
1020 | ||
ed1efb2a SK |
1021 | static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) |
1022 | { | |
1023 | int h; | |
1024 | struct ip6_tnl *t; | |
1025 | LIST_HEAD(list); | |
1026 | ||
1027 | for (h = 0; h < HASH_SIZE; h++) { | |
1028 | t = rtnl_dereference(ip6n->tnls_r_l[h]); | |
1029 | while (t != NULL) { | |
1030 | unregister_netdevice_queue(t->dev, &list); | |
1031 | t = rtnl_dereference(t->next); | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | t = rtnl_dereference(ip6n->tnls_wc[0]); | |
1036 | unregister_netdevice_queue(t->dev, &list); | |
1037 | unregister_netdevice_many(&list); | |
1038 | } | |
1039 | ||
1040 | static int __net_init vti6_init_net(struct net *net) | |
1041 | { | |
1042 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1043 | struct ip6_tnl *t = NULL; | |
1044 | int err; | |
1045 | ||
1046 | ip6n->tnls[0] = ip6n->tnls_wc; | |
1047 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1048 | ||
1049 | err = -ENOMEM; | |
1050 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", | |
c835a677 | 1051 | NET_NAME_UNKNOWN, vti6_dev_setup); |
ed1efb2a SK |
1052 | |
1053 | if (!ip6n->fb_tnl_dev) | |
1054 | goto err_alloc_dev; | |
1055 | dev_net_set(ip6n->fb_tnl_dev, net); | |
20ea60ca | 1056 | ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
ed1efb2a SK |
1057 | |
1058 | err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); | |
1059 | if (err < 0) | |
1060 | goto err_register; | |
1061 | ||
1062 | err = register_netdev(ip6n->fb_tnl_dev); | |
1063 | if (err < 0) | |
1064 | goto err_register; | |
1065 | ||
1066 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1067 | ||
1068 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
1069 | return 0; | |
1070 | ||
1071 | err_register: | |
1072 | vti6_dev_free(ip6n->fb_tnl_dev); | |
1073 | err_alloc_dev: | |
1074 | return err; | |
1075 | } | |
1076 | ||
1077 | static void __net_exit vti6_exit_net(struct net *net) | |
1078 | { | |
1079 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1080 | ||
1081 | rtnl_lock(); | |
1082 | vti6_destroy_tunnels(ip6n); | |
1083 | rtnl_unlock(); | |
1084 | } | |
1085 | ||
1086 | static struct pernet_operations vti6_net_ops = { | |
1087 | .init = vti6_init_net, | |
1088 | .exit = vti6_exit_net, | |
1089 | .id = &vti6_net_id, | |
1090 | .size = sizeof(struct vti6_net), | |
1091 | }; | |
1092 | ||
fa9ad96d SK |
1093 | static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
1094 | .handler = vti6_rcv, | |
1095 | .cb_handler = vti6_rcv_cb, | |
1096 | .err_handler = vti6_err, | |
1097 | .priority = 100, | |
1098 | }; | |
1099 | ||
1100 | static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { | |
1101 | .handler = vti6_rcv, | |
1102 | .cb_handler = vti6_rcv_cb, | |
1103 | .err_handler = vti6_err, | |
1104 | .priority = 100, | |
1105 | }; | |
1106 | ||
1107 | static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { | |
1108 | .handler = vti6_rcv, | |
1109 | .cb_handler = vti6_rcv_cb, | |
1110 | .err_handler = vti6_err, | |
1111 | .priority = 100, | |
1112 | }; | |
1113 | ||
ed1efb2a SK |
1114 | /** |
1115 | * vti6_tunnel_init - register protocol and reserve needed resources | |
1116 | * | |
1117 | * Return: 0 on success | |
1118 | **/ | |
1119 | static int __init vti6_tunnel_init(void) | |
1120 | { | |
e59d82fd MK |
1121 | const char *msg; |
1122 | int err; | |
ed1efb2a | 1123 | |
e59d82fd | 1124 | msg = "tunnel device"; |
ed1efb2a SK |
1125 | err = register_pernet_device(&vti6_net_ops); |
1126 | if (err < 0) | |
e59d82fd | 1127 | goto pernet_dev_failed; |
ed1efb2a | 1128 | |
e59d82fd | 1129 | msg = "tunnel protocols"; |
fa9ad96d | 1130 | err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd MK |
1131 | if (err < 0) |
1132 | goto xfrm_proto_esp_failed; | |
fa9ad96d | 1133 | err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd MK |
1134 | if (err < 0) |
1135 | goto xfrm_proto_ah_failed; | |
fa9ad96d | 1136 | err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd MK |
1137 | if (err < 0) |
1138 | goto xfrm_proto_comp_failed; | |
fa9ad96d | 1139 | |
e59d82fd | 1140 | msg = "netlink interface"; |
ed1efb2a SK |
1141 | err = rtnl_link_register(&vti6_link_ops); |
1142 | if (err < 0) | |
1143 | goto rtnl_link_failed; | |
1144 | ||
1145 | return 0; | |
1146 | ||
1147 | rtnl_link_failed: | |
fa9ad96d | 1148 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd | 1149 | xfrm_proto_comp_failed: |
fa9ad96d | 1150 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd | 1151 | xfrm_proto_ah_failed: |
fa9ad96d | 1152 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd | 1153 | xfrm_proto_esp_failed: |
ed1efb2a | 1154 | unregister_pernet_device(&vti6_net_ops); |
e59d82fd MK |
1155 | pernet_dev_failed: |
1156 | pr_err("vti6 init: failed to register %s\n", msg); | |
ed1efb2a SK |
1157 | return err; |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * vti6_tunnel_cleanup - free resources and unregister protocol | |
1162 | **/ | |
1163 | static void __exit vti6_tunnel_cleanup(void) | |
1164 | { | |
1165 | rtnl_link_unregister(&vti6_link_ops); | |
e59d82fd MK |
1166 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
1167 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); | |
1168 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); | |
ed1efb2a SK |
1169 | unregister_pernet_device(&vti6_net_ops); |
1170 | } | |
1171 | ||
1172 | module_init(vti6_tunnel_init); | |
1173 | module_exit(vti6_tunnel_cleanup); | |
1174 | MODULE_LICENSE("GPL"); | |
1175 | MODULE_ALIAS_RTNL_LINK("vti6"); | |
1176 | MODULE_ALIAS_NETDEV("ip6_vti0"); | |
1177 | MODULE_AUTHOR("Steffen Klassert"); | |
1178 | MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); |