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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); |
63159f29 | 221 | if (!dev) |
ed1efb2a SK |
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); | |
092a29a4 | 291 | struct vti6_net *ip6n = net_generic(t->net, vti6_net_id); |
ed1efb2a SK |
292 | |
293 | if (dev == ip6n->fb_tnl_dev) | |
294 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); | |
295 | else | |
296 | vti6_tnl_unlink(ip6n, t); | |
ed1efb2a SK |
297 | dev_put(dev); |
298 | } | |
299 | ||
300 | static int vti6_rcv(struct sk_buff *skb) | |
301 | { | |
302 | struct ip6_tnl *t; | |
303 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
304 | ||
305 | rcu_read_lock(); | |
e5d08d71 | 306 | t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
53b24b8f | 307 | if (t) { |
ed1efb2a SK |
308 | if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { |
309 | rcu_read_unlock(); | |
310 | goto discard; | |
311 | } | |
312 | ||
313 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
314 | rcu_read_unlock(); | |
315 | return 0; | |
316 | } | |
317 | ||
318 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { | |
319 | t->dev->stats.rx_dropped++; | |
320 | rcu_read_unlock(); | |
321 | goto discard; | |
322 | } | |
323 | ||
fa9ad96d | 324 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
ed1efb2a SK |
325 | |
326 | rcu_read_unlock(); | |
fa9ad96d SK |
327 | |
328 | return xfrm6_rcv(skb); | |
ed1efb2a SK |
329 | } |
330 | rcu_read_unlock(); | |
fa9ad96d | 331 | return -EINVAL; |
ed1efb2a SK |
332 | discard: |
333 | kfree_skb(skb); | |
334 | return 0; | |
335 | } | |
336 | ||
fa9ad96d SK |
337 | static int vti6_rcv_cb(struct sk_buff *skb, int err) |
338 | { | |
339 | unsigned short family; | |
340 | struct net_device *dev; | |
341 | struct pcpu_sw_netstats *tstats; | |
342 | struct xfrm_state *x; | |
343 | struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; | |
d55c670c AD |
344 | u32 orig_mark = skb->mark; |
345 | int ret; | |
fa9ad96d SK |
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 | ||
d55c670c AD |
362 | skb->mark = be32_to_cpu(t->parms.i_key); |
363 | ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); | |
364 | skb->mark = orig_mark; | |
365 | ||
366 | if (!ret) | |
fa9ad96d SK |
367 | return -EPERM; |
368 | ||
369 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); | |
370 | skb->dev = dev; | |
371 | ||
372 | tstats = this_cpu_ptr(dev->tstats); | |
373 | u64_stats_update_begin(&tstats->syncp); | |
374 | tstats->rx_packets++; | |
375 | tstats->rx_bytes += skb->len; | |
376 | u64_stats_update_end(&tstats->syncp); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
ed1efb2a SK |
381 | /** |
382 | * vti6_addr_conflict - compare packet addresses to tunnel's own | |
383 | * @t: the outgoing tunnel device | |
384 | * @hdr: IPv6 header from the incoming packet | |
385 | * | |
386 | * Description: | |
387 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
388 | * doesn't match source of incoming packet. | |
389 | * | |
390 | * Return: | |
391 | * 1 if conflict, | |
392 | * 0 else | |
393 | **/ | |
394 | static inline bool | |
395 | vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) | |
396 | { | |
397 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
398 | } | |
399 | ||
26be8e2d SK |
400 | static bool vti6_state_check(const struct xfrm_state *x, |
401 | const struct in6_addr *dst, | |
402 | const struct in6_addr *src) | |
403 | { | |
404 | xfrm_address_t *daddr = (xfrm_address_t *)dst; | |
405 | xfrm_address_t *saddr = (xfrm_address_t *)src; | |
406 | ||
407 | /* if there is no transform then this tunnel is not functional. | |
408 | * Or if the xfrm is not mode tunnel. | |
409 | */ | |
410 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
411 | x->props.family != AF_INET6) | |
412 | return false; | |
413 | ||
414 | if (ipv6_addr_any(dst)) | |
415 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); | |
416 | ||
417 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) | |
418 | return false; | |
419 | ||
420 | return true; | |
421 | } | |
422 | ||
ed1efb2a SK |
423 | /** |
424 | * vti6_xmit - send a packet | |
425 | * @skb: the outgoing socket buffer | |
426 | * @dev: the outgoing tunnel device | |
22e1b23d | 427 | * @fl: the flow informations for the xfrm_lookup |
ed1efb2a | 428 | **/ |
22e1b23d SK |
429 | static int |
430 | vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
ed1efb2a | 431 | { |
ed1efb2a SK |
432 | struct ip6_tnl *t = netdev_priv(dev); |
433 | struct net_device_stats *stats = &t->dev->stats; | |
7c852581 | 434 | struct dst_entry *dst = skb_dst(skb); |
ed1efb2a | 435 | struct net_device *tdev; |
d5005140 | 436 | struct xfrm_state *x; |
ed1efb2a | 437 | int err = -1; |
ccd740cb | 438 | int mtu; |
ed1efb2a | 439 | |
7c852581 SK |
440 | if (!dst) |
441 | goto tx_err_link_failure; | |
ed1efb2a | 442 | |
7c852581 | 443 | dst_hold(dst); |
22e1b23d | 444 | dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
7c852581 SK |
445 | if (IS_ERR(dst)) { |
446 | err = PTR_ERR(dst); | |
447 | dst = NULL; | |
448 | goto tx_err_link_failure; | |
ed1efb2a SK |
449 | } |
450 | ||
d5005140 SK |
451 | x = dst->xfrm; |
452 | if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) | |
453 | goto tx_err_link_failure; | |
454 | ||
455 | if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, | |
456 | (const struct in6_addr *)&x->id.daddr)) | |
ed1efb2a SK |
457 | goto tx_err_link_failure; |
458 | ||
459 | tdev = dst->dev; | |
460 | ||
461 | if (tdev == dev) { | |
462 | stats->collisions++; | |
463 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
464 | t->parms.name); | |
465 | goto tx_err_dst_release; | |
466 | } | |
467 | ||
7c852581 SK |
468 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
469 | skb_dst_set(skb, dst); | |
470 | skb->dev = skb_dst(skb)->dev; | |
ed1efb2a | 471 | |
ccd740cb SK |
472 | mtu = dst_mtu(dst); |
473 | if (!skb->ignore_df && skb->len > mtu) { | |
474 | skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu); | |
475 | ||
476 | if (skb->protocol == htons(ETH_P_IPV6)) | |
477 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
478 | else | |
479 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
480 | htonl(mtu)); | |
481 | ||
482 | return -EMSGSIZE; | |
483 | } | |
484 | ||
13206b6b | 485 | err = dst_output(t->net, skb->sk, skb); |
22e1b23d SK |
486 | if (net_xmit_eval(err) == 0) { |
487 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
488 | ||
489 | u64_stats_update_begin(&tstats->syncp); | |
490 | tstats->tx_bytes += skb->len; | |
491 | tstats->tx_packets++; | |
492 | u64_stats_update_end(&tstats->syncp); | |
493 | } else { | |
494 | stats->tx_errors++; | |
495 | stats->tx_aborted_errors++; | |
496 | } | |
ed1efb2a SK |
497 | |
498 | return 0; | |
499 | tx_err_link_failure: | |
500 | stats->tx_carrier_errors++; | |
501 | dst_link_failure(skb); | |
502 | tx_err_dst_release: | |
7c852581 | 503 | dst_release(dst); |
ed1efb2a SK |
504 | return err; |
505 | } | |
506 | ||
507 | static netdev_tx_t | |
508 | vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
509 | { | |
510 | struct ip6_tnl *t = netdev_priv(dev); | |
511 | struct net_device_stats *stats = &t->dev->stats; | |
22e1b23d SK |
512 | struct ipv6hdr *ipv6h; |
513 | struct flowi fl; | |
ed1efb2a SK |
514 | int ret; |
515 | ||
22e1b23d | 516 | memset(&fl, 0, sizeof(fl)); |
22e1b23d | 517 | |
ed1efb2a SK |
518 | switch (skb->protocol) { |
519 | case htons(ETH_P_IPV6): | |
22e1b23d SK |
520 | ipv6h = ipv6_hdr(skb); |
521 | ||
522 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || | |
d5005140 | 523 | vti6_addr_conflict(t, ipv6h)) |
22e1b23d SK |
524 | goto tx_err; |
525 | ||
526 | xfrm_decode_session(skb, &fl, AF_INET6); | |
527 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
528 | break; | |
529 | case htons(ETH_P_IP): | |
530 | xfrm_decode_session(skb, &fl, AF_INET); | |
531 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
ed1efb2a SK |
532 | break; |
533 | default: | |
534 | goto tx_err; | |
535 | } | |
536 | ||
cd5279c1 AD |
537 | /* override mark with tunnel output key */ |
538 | fl.flowi_mark = be32_to_cpu(t->parms.o_key); | |
539 | ||
22e1b23d | 540 | ret = vti6_xmit(skb, dev, &fl); |
ed1efb2a SK |
541 | if (ret < 0) |
542 | goto tx_err; | |
543 | ||
544 | return NETDEV_TX_OK; | |
545 | ||
546 | tx_err: | |
547 | stats->tx_errors++; | |
548 | stats->tx_dropped++; | |
549 | kfree_skb(skb); | |
550 | return NETDEV_TX_OK; | |
551 | } | |
552 | ||
fa9ad96d SK |
553 | static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
554 | u8 type, u8 code, int offset, __be32 info) | |
555 | { | |
556 | __be32 spi; | |
6d004d6c | 557 | __u32 mark; |
fa9ad96d SK |
558 | struct xfrm_state *x; |
559 | struct ip6_tnl *t; | |
560 | struct ip_esp_hdr *esph; | |
561 | struct ip_auth_hdr *ah; | |
562 | struct ip_comp_hdr *ipch; | |
563 | struct net *net = dev_net(skb->dev); | |
564 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
565 | int protocol = iph->nexthdr; | |
566 | ||
567 | t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); | |
568 | if (!t) | |
569 | return -1; | |
570 | ||
6d004d6c SK |
571 | mark = be32_to_cpu(t->parms.o_key); |
572 | ||
fa9ad96d SK |
573 | switch (protocol) { |
574 | case IPPROTO_ESP: | |
575 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
576 | spi = esph->spi; | |
577 | break; | |
578 | case IPPROTO_AH: | |
579 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
580 | spi = ah->spi; | |
581 | break; | |
582 | case IPPROTO_COMP: | |
583 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
584 | spi = htonl(ntohs(ipch->cpi)); | |
585 | break; | |
586 | default: | |
587 | return 0; | |
588 | } | |
589 | ||
590 | if (type != ICMPV6_PKT_TOOBIG && | |
591 | type != NDISC_REDIRECT) | |
592 | return 0; | |
593 | ||
6d004d6c | 594 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
fa9ad96d SK |
595 | spi, protocol, AF_INET6); |
596 | if (!x) | |
597 | return 0; | |
598 | ||
599 | if (type == NDISC_REDIRECT) | |
600 | ip6_redirect(skb, net, skb->dev->ifindex, 0); | |
601 | else | |
602 | ip6_update_pmtu(skb, net, info, 0, 0); | |
603 | xfrm_state_put(x); | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
ed1efb2a SK |
608 | static void vti6_link_config(struct ip6_tnl *t) |
609 | { | |
ed1efb2a SK |
610 | struct net_device *dev = t->dev; |
611 | struct __ip6_tnl_parm *p = &t->parms; | |
ed1efb2a SK |
612 | |
613 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
614 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
615 | ||
ed1efb2a SK |
616 | p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
617 | IP6_TNL_F_CAP_PER_PACKET); | |
618 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
619 | ||
620 | if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) | |
621 | dev->flags |= IFF_POINTOPOINT; | |
622 | else | |
623 | dev->flags &= ~IFF_POINTOPOINT; | |
ed1efb2a SK |
624 | } |
625 | ||
626 | /** | |
627 | * vti6_tnl_change - update the tunnel parameters | |
628 | * @t: tunnel to be changed | |
629 | * @p: tunnel configuration parameters | |
630 | * | |
631 | * Description: | |
632 | * vti6_tnl_change() updates the tunnel parameters | |
633 | **/ | |
634 | static int | |
635 | vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) | |
636 | { | |
637 | t->parms.laddr = p->laddr; | |
638 | t->parms.raddr = p->raddr; | |
639 | t->parms.link = p->link; | |
640 | t->parms.i_key = p->i_key; | |
641 | t->parms.o_key = p->o_key; | |
642 | t->parms.proto = p->proto; | |
643 | ip6_tnl_dst_reset(t); | |
644 | vti6_link_config(t); | |
645 | return 0; | |
646 | } | |
647 | ||
648 | static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) | |
649 | { | |
650 | struct net *net = dev_net(t->dev); | |
651 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
652 | int err; | |
653 | ||
654 | vti6_tnl_unlink(ip6n, t); | |
655 | synchronize_net(); | |
656 | err = vti6_tnl_change(t, p); | |
657 | vti6_tnl_link(ip6n, t); | |
658 | netdev_state_change(t->dev); | |
659 | return err; | |
660 | } | |
661 | ||
662 | static void | |
663 | vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) | |
664 | { | |
665 | p->laddr = u->laddr; | |
666 | p->raddr = u->raddr; | |
667 | p->link = u->link; | |
668 | p->i_key = u->i_key; | |
669 | p->o_key = u->o_key; | |
670 | p->proto = u->proto; | |
671 | ||
672 | memcpy(p->name, u->name, sizeof(u->name)); | |
673 | } | |
674 | ||
675 | static void | |
676 | vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) | |
677 | { | |
678 | u->laddr = p->laddr; | |
679 | u->raddr = p->raddr; | |
680 | u->link = p->link; | |
681 | u->i_key = p->i_key; | |
682 | u->o_key = p->o_key; | |
683 | u->proto = p->proto; | |
684 | ||
685 | memcpy(u->name, p->name, sizeof(u->name)); | |
686 | } | |
687 | ||
688 | /** | |
689 | * vti6_tnl_ioctl - configure vti6 tunnels from userspace | |
690 | * @dev: virtual device associated with tunnel | |
691 | * @ifr: parameters passed from userspace | |
692 | * @cmd: command to be performed | |
693 | * | |
694 | * Description: | |
695 | * vti6_ioctl() is used for managing vti6 tunnels | |
696 | * from userspace. | |
697 | * | |
698 | * The possible commands are the following: | |
699 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
700 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
701 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
702 | * %SIOCDELTUNNEL: delete tunnel | |
703 | * | |
704 | * The fallback device "ip6_vti0", created during module | |
705 | * initialization, can be used for creating other tunnel devices. | |
706 | * | |
707 | * Return: | |
708 | * 0 on success, | |
709 | * %-EFAULT if unable to copy data to or from userspace, | |
710 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
711 | * %-EINVAL if passed tunnel parameters are invalid, | |
712 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
713 | * %-ENODEV if attempting to change or delete a nonexisting device | |
714 | **/ | |
715 | static int | |
716 | vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
717 | { | |
718 | int err = 0; | |
719 | struct ip6_tnl_parm2 p; | |
720 | struct __ip6_tnl_parm p1; | |
721 | struct ip6_tnl *t = NULL; | |
722 | struct net *net = dev_net(dev); | |
723 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
724 | ||
725 | switch (cmd) { | |
726 | case SIOCGETTUNNEL: | |
727 | if (dev == ip6n->fb_tnl_dev) { | |
728 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
729 | err = -EFAULT; | |
730 | break; | |
731 | } | |
732 | vti6_parm_from_user(&p1, &p); | |
733 | t = vti6_locate(net, &p1, 0); | |
734 | } else { | |
735 | memset(&p, 0, sizeof(p)); | |
736 | } | |
63159f29 | 737 | if (!t) |
ed1efb2a SK |
738 | t = netdev_priv(dev); |
739 | vti6_parm_to_user(&p, &t->parms); | |
740 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
741 | err = -EFAULT; | |
742 | break; | |
743 | case SIOCADDTUNNEL: | |
744 | case SIOCCHGTUNNEL: | |
745 | err = -EPERM; | |
746 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
747 | break; | |
748 | err = -EFAULT; | |
749 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
750 | break; | |
751 | err = -EINVAL; | |
752 | if (p.proto != IPPROTO_IPV6 && p.proto != 0) | |
753 | break; | |
754 | vti6_parm_from_user(&p1, &p); | |
755 | t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
756 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
53b24b8f | 757 | if (t) { |
ed1efb2a SK |
758 | if (t->dev != dev) { |
759 | err = -EEXIST; | |
760 | break; | |
761 | } | |
762 | } else | |
763 | t = netdev_priv(dev); | |
764 | ||
765 | err = vti6_update(t, &p1); | |
766 | } | |
767 | if (t) { | |
768 | err = 0; | |
769 | vti6_parm_to_user(&p, &t->parms); | |
770 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
771 | err = -EFAULT; | |
772 | ||
773 | } else | |
774 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
775 | break; | |
776 | case SIOCDELTUNNEL: | |
777 | err = -EPERM; | |
778 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
779 | break; | |
780 | ||
781 | if (dev == ip6n->fb_tnl_dev) { | |
782 | err = -EFAULT; | |
783 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
784 | break; | |
785 | err = -ENOENT; | |
786 | vti6_parm_from_user(&p1, &p); | |
787 | t = vti6_locate(net, &p1, 0); | |
63159f29 | 788 | if (!t) |
ed1efb2a SK |
789 | break; |
790 | err = -EPERM; | |
791 | if (t->dev == ip6n->fb_tnl_dev) | |
792 | break; | |
793 | dev = t->dev; | |
794 | } | |
795 | err = 0; | |
796 | unregister_netdevice(dev); | |
797 | break; | |
798 | default: | |
799 | err = -EINVAL; | |
800 | } | |
801 | return err; | |
802 | } | |
803 | ||
804 | /** | |
805 | * vti6_tnl_change_mtu - change mtu manually for tunnel device | |
806 | * @dev: virtual device associated with tunnel | |
807 | * @new_mtu: the new mtu | |
808 | * | |
809 | * Return: | |
810 | * 0 on success, | |
811 | * %-EINVAL if mtu too small | |
812 | **/ | |
813 | static int vti6_change_mtu(struct net_device *dev, int new_mtu) | |
814 | { | |
815 | if (new_mtu < IPV6_MIN_MTU) | |
816 | return -EINVAL; | |
817 | ||
818 | dev->mtu = new_mtu; | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static const struct net_device_ops vti6_netdev_ops = { | |
16a0231b | 823 | .ndo_init = vti6_dev_init, |
ed1efb2a SK |
824 | .ndo_uninit = vti6_dev_uninit, |
825 | .ndo_start_xmit = vti6_tnl_xmit, | |
826 | .ndo_do_ioctl = vti6_ioctl, | |
827 | .ndo_change_mtu = vti6_change_mtu, | |
469bdcef | 828 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 829 | .ndo_get_iflink = ip6_tnl_get_iflink, |
ed1efb2a SK |
830 | }; |
831 | ||
832 | /** | |
833 | * vti6_dev_setup - setup virtual tunnel device | |
834 | * @dev: virtual device associated with tunnel | |
835 | * | |
836 | * Description: | |
837 | * Initialize function pointers and device parameters | |
838 | **/ | |
839 | static void vti6_dev_setup(struct net_device *dev) | |
840 | { | |
ed1efb2a SK |
841 | dev->netdev_ops = &vti6_netdev_ops; |
842 | dev->destructor = vti6_dev_free; | |
843 | ||
844 | dev->type = ARPHRD_TUNNEL6; | |
845 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); | |
846 | dev->mtu = ETH_DATA_LEN; | |
ed1efb2a SK |
847 | dev->flags |= IFF_NOARP; |
848 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 849 | netif_keep_dst(dev); |
ed1efb2a SK |
850 | } |
851 | ||
852 | /** | |
853 | * vti6_dev_init_gen - general initializer for all tunnel devices | |
854 | * @dev: virtual device associated with tunnel | |
855 | **/ | |
856 | static inline int vti6_dev_init_gen(struct net_device *dev) | |
857 | { | |
858 | struct ip6_tnl *t = netdev_priv(dev); | |
859 | ||
860 | t->dev = dev; | |
861 | t->net = dev_net(dev); | |
1c213bd2 | 862 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
ed1efb2a SK |
863 | if (!dev->tstats) |
864 | return -ENOMEM; | |
865 | return 0; | |
866 | } | |
867 | ||
868 | /** | |
869 | * vti6_dev_init - initializer for all non fallback tunnel devices | |
870 | * @dev: virtual device associated with tunnel | |
871 | **/ | |
872 | static int vti6_dev_init(struct net_device *dev) | |
873 | { | |
874 | struct ip6_tnl *t = netdev_priv(dev); | |
875 | int err = vti6_dev_init_gen(dev); | |
876 | ||
877 | if (err) | |
878 | return err; | |
879 | vti6_link_config(t); | |
880 | return 0; | |
881 | } | |
882 | ||
883 | /** | |
884 | * vti6_fb_tnl_dev_init - initializer for fallback tunnel device | |
885 | * @dev: fallback device | |
886 | * | |
887 | * Return: 0 | |
888 | **/ | |
889 | static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) | |
890 | { | |
891 | struct ip6_tnl *t = netdev_priv(dev); | |
892 | struct net *net = dev_net(dev); | |
893 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
ed1efb2a SK |
894 | |
895 | t->parms.proto = IPPROTO_IPV6; | |
896 | dev_hold(dev); | |
897 | ||
ed1efb2a SK |
898 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
899 | return 0; | |
900 | } | |
901 | ||
902 | static int vti6_validate(struct nlattr *tb[], struct nlattr *data[]) | |
903 | { | |
904 | return 0; | |
905 | } | |
906 | ||
907 | static void vti6_netlink_parms(struct nlattr *data[], | |
908 | struct __ip6_tnl_parm *parms) | |
909 | { | |
910 | memset(parms, 0, sizeof(*parms)); | |
911 | ||
912 | if (!data) | |
913 | return; | |
914 | ||
915 | if (data[IFLA_VTI_LINK]) | |
916 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
917 | ||
918 | if (data[IFLA_VTI_LOCAL]) | |
67b61f6c | 919 | parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]); |
ed1efb2a SK |
920 | |
921 | if (data[IFLA_VTI_REMOTE]) | |
67b61f6c | 922 | parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]); |
ed1efb2a SK |
923 | |
924 | if (data[IFLA_VTI_IKEY]) | |
925 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
926 | ||
927 | if (data[IFLA_VTI_OKEY]) | |
928 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
929 | } | |
930 | ||
931 | static int vti6_newlink(struct net *src_net, struct net_device *dev, | |
932 | struct nlattr *tb[], struct nlattr *data[]) | |
933 | { | |
934 | struct net *net = dev_net(dev); | |
935 | struct ip6_tnl *nt; | |
936 | ||
937 | nt = netdev_priv(dev); | |
938 | vti6_netlink_parms(data, &nt->parms); | |
939 | ||
940 | nt->parms.proto = IPPROTO_IPV6; | |
941 | ||
942 | if (vti6_locate(net, &nt->parms, 0)) | |
943 | return -EEXIST; | |
944 | ||
945 | return vti6_tnl_create2(dev); | |
946 | } | |
947 | ||
20ea60ca | 948 | static void vti6_dellink(struct net_device *dev, struct list_head *head) |
949 | { | |
950 | struct net *net = dev_net(dev); | |
951 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
952 | ||
953 | if (dev != ip6n->fb_tnl_dev) | |
954 | unregister_netdevice_queue(dev, head); | |
955 | } | |
956 | ||
ed1efb2a SK |
957 | static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], |
958 | struct nlattr *data[]) | |
959 | { | |
960 | struct ip6_tnl *t; | |
961 | struct __ip6_tnl_parm p; | |
962 | struct net *net = dev_net(dev); | |
963 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
964 | ||
965 | if (dev == ip6n->fb_tnl_dev) | |
966 | return -EINVAL; | |
967 | ||
968 | vti6_netlink_parms(data, &p); | |
969 | ||
970 | t = vti6_locate(net, &p, 0); | |
971 | ||
972 | if (t) { | |
973 | if (t->dev != dev) | |
974 | return -EEXIST; | |
975 | } else | |
976 | t = netdev_priv(dev); | |
977 | ||
978 | return vti6_update(t, &p); | |
979 | } | |
980 | ||
981 | static size_t vti6_get_size(const struct net_device *dev) | |
982 | { | |
983 | return | |
984 | /* IFLA_VTI_LINK */ | |
985 | nla_total_size(4) + | |
986 | /* IFLA_VTI_LOCAL */ | |
987 | nla_total_size(sizeof(struct in6_addr)) + | |
988 | /* IFLA_VTI_REMOTE */ | |
989 | nla_total_size(sizeof(struct in6_addr)) + | |
990 | /* IFLA_VTI_IKEY */ | |
991 | nla_total_size(4) + | |
992 | /* IFLA_VTI_OKEY */ | |
993 | nla_total_size(4) + | |
994 | 0; | |
995 | } | |
996 | ||
997 | static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
998 | { | |
999 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1000 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1001 | ||
1002 | if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || | |
930345ea JB |
1003 | nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || |
1004 | nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || | |
ed1efb2a SK |
1005 | nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || |
1006 | nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key)) | |
1007 | goto nla_put_failure; | |
1008 | return 0; | |
1009 | ||
1010 | nla_put_failure: | |
1011 | return -EMSGSIZE; | |
1012 | } | |
1013 | ||
1014 | static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { | |
1015 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
1016 | [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1017 | [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1018 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
1019 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
1020 | }; | |
1021 | ||
1022 | static struct rtnl_link_ops vti6_link_ops __read_mostly = { | |
1023 | .kind = "vti6", | |
1024 | .maxtype = IFLA_VTI_MAX, | |
1025 | .policy = vti6_policy, | |
1026 | .priv_size = sizeof(struct ip6_tnl), | |
1027 | .setup = vti6_dev_setup, | |
1028 | .validate = vti6_validate, | |
1029 | .newlink = vti6_newlink, | |
20ea60ca | 1030 | .dellink = vti6_dellink, |
ed1efb2a SK |
1031 | .changelink = vti6_changelink, |
1032 | .get_size = vti6_get_size, | |
1033 | .fill_info = vti6_fill_info, | |
1728d4fa | 1034 | .get_link_net = ip6_tnl_get_link_net, |
ed1efb2a SK |
1035 | }; |
1036 | ||
ed1efb2a SK |
1037 | static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) |
1038 | { | |
1039 | int h; | |
1040 | struct ip6_tnl *t; | |
1041 | LIST_HEAD(list); | |
1042 | ||
1043 | for (h = 0; h < HASH_SIZE; h++) { | |
1044 | t = rtnl_dereference(ip6n->tnls_r_l[h]); | |
53b24b8f | 1045 | while (t) { |
ed1efb2a SK |
1046 | unregister_netdevice_queue(t->dev, &list); |
1047 | t = rtnl_dereference(t->next); | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | t = rtnl_dereference(ip6n->tnls_wc[0]); | |
1052 | unregister_netdevice_queue(t->dev, &list); | |
1053 | unregister_netdevice_many(&list); | |
1054 | } | |
1055 | ||
1056 | static int __net_init vti6_init_net(struct net *net) | |
1057 | { | |
1058 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1059 | struct ip6_tnl *t = NULL; | |
1060 | int err; | |
1061 | ||
1062 | ip6n->tnls[0] = ip6n->tnls_wc; | |
1063 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1064 | ||
1065 | err = -ENOMEM; | |
1066 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", | |
c835a677 | 1067 | NET_NAME_UNKNOWN, vti6_dev_setup); |
ed1efb2a SK |
1068 | |
1069 | if (!ip6n->fb_tnl_dev) | |
1070 | goto err_alloc_dev; | |
1071 | dev_net_set(ip6n->fb_tnl_dev, net); | |
20ea60ca | 1072 | ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
ed1efb2a SK |
1073 | |
1074 | err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); | |
1075 | if (err < 0) | |
1076 | goto err_register; | |
1077 | ||
1078 | err = register_netdev(ip6n->fb_tnl_dev); | |
1079 | if (err < 0) | |
1080 | goto err_register; | |
1081 | ||
1082 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1083 | ||
1084 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
1085 | return 0; | |
1086 | ||
1087 | err_register: | |
1088 | vti6_dev_free(ip6n->fb_tnl_dev); | |
1089 | err_alloc_dev: | |
1090 | return err; | |
1091 | } | |
1092 | ||
1093 | static void __net_exit vti6_exit_net(struct net *net) | |
1094 | { | |
1095 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1096 | ||
1097 | rtnl_lock(); | |
1098 | vti6_destroy_tunnels(ip6n); | |
1099 | rtnl_unlock(); | |
1100 | } | |
1101 | ||
1102 | static struct pernet_operations vti6_net_ops = { | |
1103 | .init = vti6_init_net, | |
1104 | .exit = vti6_exit_net, | |
1105 | .id = &vti6_net_id, | |
1106 | .size = sizeof(struct vti6_net), | |
1107 | }; | |
1108 | ||
fa9ad96d SK |
1109 | static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
1110 | .handler = vti6_rcv, | |
1111 | .cb_handler = vti6_rcv_cb, | |
1112 | .err_handler = vti6_err, | |
1113 | .priority = 100, | |
1114 | }; | |
1115 | ||
1116 | static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { | |
1117 | .handler = vti6_rcv, | |
1118 | .cb_handler = vti6_rcv_cb, | |
1119 | .err_handler = vti6_err, | |
1120 | .priority = 100, | |
1121 | }; | |
1122 | ||
1123 | static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { | |
1124 | .handler = vti6_rcv, | |
1125 | .cb_handler = vti6_rcv_cb, | |
1126 | .err_handler = vti6_err, | |
1127 | .priority = 100, | |
1128 | }; | |
1129 | ||
ed1efb2a SK |
1130 | /** |
1131 | * vti6_tunnel_init - register protocol and reserve needed resources | |
1132 | * | |
1133 | * Return: 0 on success | |
1134 | **/ | |
1135 | static int __init vti6_tunnel_init(void) | |
1136 | { | |
e59d82fd MK |
1137 | const char *msg; |
1138 | int err; | |
ed1efb2a | 1139 | |
e59d82fd | 1140 | msg = "tunnel device"; |
ed1efb2a SK |
1141 | err = register_pernet_device(&vti6_net_ops); |
1142 | if (err < 0) | |
e59d82fd | 1143 | goto pernet_dev_failed; |
ed1efb2a | 1144 | |
e59d82fd | 1145 | msg = "tunnel protocols"; |
fa9ad96d | 1146 | err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd MK |
1147 | if (err < 0) |
1148 | goto xfrm_proto_esp_failed; | |
fa9ad96d | 1149 | err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd MK |
1150 | if (err < 0) |
1151 | goto xfrm_proto_ah_failed; | |
fa9ad96d | 1152 | err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd MK |
1153 | if (err < 0) |
1154 | goto xfrm_proto_comp_failed; | |
fa9ad96d | 1155 | |
e59d82fd | 1156 | msg = "netlink interface"; |
ed1efb2a SK |
1157 | err = rtnl_link_register(&vti6_link_ops); |
1158 | if (err < 0) | |
1159 | goto rtnl_link_failed; | |
1160 | ||
1161 | return 0; | |
1162 | ||
1163 | rtnl_link_failed: | |
fa9ad96d | 1164 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd | 1165 | xfrm_proto_comp_failed: |
fa9ad96d | 1166 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd | 1167 | xfrm_proto_ah_failed: |
fa9ad96d | 1168 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd | 1169 | xfrm_proto_esp_failed: |
ed1efb2a | 1170 | unregister_pernet_device(&vti6_net_ops); |
e59d82fd MK |
1171 | pernet_dev_failed: |
1172 | pr_err("vti6 init: failed to register %s\n", msg); | |
ed1efb2a SK |
1173 | return err; |
1174 | } | |
1175 | ||
1176 | /** | |
1177 | * vti6_tunnel_cleanup - free resources and unregister protocol | |
1178 | **/ | |
1179 | static void __exit vti6_tunnel_cleanup(void) | |
1180 | { | |
1181 | rtnl_link_unregister(&vti6_link_ops); | |
e59d82fd MK |
1182 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
1183 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); | |
1184 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); | |
ed1efb2a SK |
1185 | unregister_pernet_device(&vti6_net_ops); |
1186 | } | |
1187 | ||
1188 | module_init(vti6_tunnel_init); | |
1189 | module_exit(vti6_tunnel_cleanup); | |
1190 | MODULE_LICENSE("GPL"); | |
1191 | MODULE_ALIAS_RTNL_LINK("vti6"); | |
1192 | MODULE_ALIAS_NETDEV("ip6_vti0"); | |
1193 | MODULE_AUTHOR("Steffen Klassert"); | |
1194 | MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); |