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