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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) && | |
d814b847 SK |
256 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
257 | if (create) | |
258 | return NULL; | |
259 | ||
ed1efb2a | 260 | return t; |
d814b847 | 261 | } |
ed1efb2a SK |
262 | } |
263 | if (!create) | |
264 | return NULL; | |
265 | return vti6_tnl_create(net, p); | |
266 | } | |
267 | ||
268 | /** | |
269 | * vti6_dev_uninit - tunnel device uninitializer | |
270 | * @dev: the device to be destroyed | |
271 | * | |
272 | * Description: | |
273 | * vti6_dev_uninit() removes tunnel from its list | |
274 | **/ | |
275 | static void vti6_dev_uninit(struct net_device *dev) | |
276 | { | |
277 | struct ip6_tnl *t = netdev_priv(dev); | |
278 | struct net *net = dev_net(dev); | |
279 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
280 | ||
281 | if (dev == ip6n->fb_tnl_dev) | |
282 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); | |
283 | else | |
284 | vti6_tnl_unlink(ip6n, t); | |
ed1efb2a SK |
285 | dev_put(dev); |
286 | } | |
287 | ||
288 | static int vti6_rcv(struct sk_buff *skb) | |
289 | { | |
290 | struct ip6_tnl *t; | |
291 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
292 | ||
293 | rcu_read_lock(); | |
ed1efb2a SK |
294 | if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
295 | &ipv6h->daddr)) != NULL) { | |
ed1efb2a SK |
296 | if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { |
297 | rcu_read_unlock(); | |
298 | goto discard; | |
299 | } | |
300 | ||
301 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
302 | rcu_read_unlock(); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { | |
307 | t->dev->stats.rx_dropped++; | |
308 | rcu_read_unlock(); | |
309 | goto discard; | |
310 | } | |
311 | ||
fa9ad96d SK |
312 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
313 | skb->mark = be32_to_cpu(t->parms.i_key); | |
ed1efb2a SK |
314 | |
315 | rcu_read_unlock(); | |
fa9ad96d SK |
316 | |
317 | return xfrm6_rcv(skb); | |
ed1efb2a SK |
318 | } |
319 | rcu_read_unlock(); | |
fa9ad96d | 320 | return -EINVAL; |
ed1efb2a SK |
321 | discard: |
322 | kfree_skb(skb); | |
323 | return 0; | |
324 | } | |
325 | ||
fa9ad96d SK |
326 | static int vti6_rcv_cb(struct sk_buff *skb, int err) |
327 | { | |
328 | unsigned short family; | |
329 | struct net_device *dev; | |
330 | struct pcpu_sw_netstats *tstats; | |
331 | struct xfrm_state *x; | |
332 | struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; | |
333 | ||
334 | if (!t) | |
335 | return 1; | |
336 | ||
337 | dev = t->dev; | |
338 | ||
339 | if (err) { | |
340 | dev->stats.rx_errors++; | |
341 | dev->stats.rx_dropped++; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | x = xfrm_input_state(skb); | |
347 | family = x->inner_mode->afinfo->family; | |
348 | ||
349 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family)) | |
350 | return -EPERM; | |
351 | ||
352 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); | |
353 | skb->dev = dev; | |
354 | ||
355 | tstats = this_cpu_ptr(dev->tstats); | |
356 | u64_stats_update_begin(&tstats->syncp); | |
357 | tstats->rx_packets++; | |
358 | tstats->rx_bytes += skb->len; | |
359 | u64_stats_update_end(&tstats->syncp); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
ed1efb2a SK |
364 | /** |
365 | * vti6_addr_conflict - compare packet addresses to tunnel's own | |
366 | * @t: the outgoing tunnel device | |
367 | * @hdr: IPv6 header from the incoming packet | |
368 | * | |
369 | * Description: | |
370 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
371 | * doesn't match source of incoming packet. | |
372 | * | |
373 | * Return: | |
374 | * 1 if conflict, | |
375 | * 0 else | |
376 | **/ | |
377 | static inline bool | |
378 | vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) | |
379 | { | |
380 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
381 | } | |
382 | ||
26be8e2d SK |
383 | static bool vti6_state_check(const struct xfrm_state *x, |
384 | const struct in6_addr *dst, | |
385 | const struct in6_addr *src) | |
386 | { | |
387 | xfrm_address_t *daddr = (xfrm_address_t *)dst; | |
388 | xfrm_address_t *saddr = (xfrm_address_t *)src; | |
389 | ||
390 | /* if there is no transform then this tunnel is not functional. | |
391 | * Or if the xfrm is not mode tunnel. | |
392 | */ | |
393 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
394 | x->props.family != AF_INET6) | |
395 | return false; | |
396 | ||
397 | if (ipv6_addr_any(dst)) | |
398 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); | |
399 | ||
400 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) | |
401 | return false; | |
402 | ||
403 | return true; | |
404 | } | |
405 | ||
ed1efb2a SK |
406 | /** |
407 | * vti6_xmit - send a packet | |
408 | * @skb: the outgoing socket buffer | |
409 | * @dev: the outgoing tunnel device | |
22e1b23d | 410 | * @fl: the flow informations for the xfrm_lookup |
ed1efb2a | 411 | **/ |
22e1b23d SK |
412 | static int |
413 | vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
ed1efb2a | 414 | { |
ed1efb2a SK |
415 | struct ip6_tnl *t = netdev_priv(dev); |
416 | struct net_device_stats *stats = &t->dev->stats; | |
7c852581 | 417 | struct dst_entry *dst = skb_dst(skb); |
ed1efb2a SK |
418 | struct net_device *tdev; |
419 | int err = -1; | |
420 | ||
7c852581 SK |
421 | if (!dst) |
422 | goto tx_err_link_failure; | |
ed1efb2a | 423 | |
7c852581 | 424 | dst_hold(dst); |
22e1b23d | 425 | dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
7c852581 SK |
426 | if (IS_ERR(dst)) { |
427 | err = PTR_ERR(dst); | |
428 | dst = NULL; | |
429 | goto tx_err_link_failure; | |
ed1efb2a SK |
430 | } |
431 | ||
26be8e2d | 432 | if (!vti6_state_check(dst->xfrm, &t->parms.raddr, &t->parms.laddr)) |
ed1efb2a SK |
433 | goto tx_err_link_failure; |
434 | ||
435 | tdev = dst->dev; | |
436 | ||
437 | if (tdev == dev) { | |
438 | stats->collisions++; | |
439 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
440 | t->parms.name); | |
441 | goto tx_err_dst_release; | |
442 | } | |
443 | ||
7c852581 SK |
444 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
445 | skb_dst_set(skb, dst); | |
446 | skb->dev = skb_dst(skb)->dev; | |
ed1efb2a | 447 | |
22e1b23d SK |
448 | err = dst_output(skb); |
449 | if (net_xmit_eval(err) == 0) { | |
450 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
451 | ||
452 | u64_stats_update_begin(&tstats->syncp); | |
453 | tstats->tx_bytes += skb->len; | |
454 | tstats->tx_packets++; | |
455 | u64_stats_update_end(&tstats->syncp); | |
456 | } else { | |
457 | stats->tx_errors++; | |
458 | stats->tx_aborted_errors++; | |
459 | } | |
ed1efb2a SK |
460 | |
461 | return 0; | |
462 | tx_err_link_failure: | |
463 | stats->tx_carrier_errors++; | |
464 | dst_link_failure(skb); | |
465 | tx_err_dst_release: | |
7c852581 | 466 | dst_release(dst); |
ed1efb2a SK |
467 | return err; |
468 | } | |
469 | ||
470 | static netdev_tx_t | |
471 | vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
472 | { | |
473 | struct ip6_tnl *t = netdev_priv(dev); | |
474 | struct net_device_stats *stats = &t->dev->stats; | |
22e1b23d SK |
475 | struct ipv6hdr *ipv6h; |
476 | struct flowi fl; | |
ed1efb2a SK |
477 | int ret; |
478 | ||
22e1b23d SK |
479 | memset(&fl, 0, sizeof(fl)); |
480 | skb->mark = be32_to_cpu(t->parms.o_key); | |
481 | ||
ed1efb2a SK |
482 | switch (skb->protocol) { |
483 | case htons(ETH_P_IPV6): | |
22e1b23d SK |
484 | ipv6h = ipv6_hdr(skb); |
485 | ||
486 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || | |
487 | !ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h)) | |
488 | goto tx_err; | |
489 | ||
490 | xfrm_decode_session(skb, &fl, AF_INET6); | |
491 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
492 | break; | |
493 | case htons(ETH_P_IP): | |
494 | xfrm_decode_session(skb, &fl, AF_INET); | |
495 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
ed1efb2a SK |
496 | break; |
497 | default: | |
498 | goto tx_err; | |
499 | } | |
500 | ||
22e1b23d | 501 | ret = vti6_xmit(skb, dev, &fl); |
ed1efb2a SK |
502 | if (ret < 0) |
503 | goto tx_err; | |
504 | ||
505 | return NETDEV_TX_OK; | |
506 | ||
507 | tx_err: | |
508 | stats->tx_errors++; | |
509 | stats->tx_dropped++; | |
510 | kfree_skb(skb); | |
511 | return NETDEV_TX_OK; | |
512 | } | |
513 | ||
fa9ad96d SK |
514 | static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
515 | u8 type, u8 code, int offset, __be32 info) | |
516 | { | |
517 | __be32 spi; | |
6d004d6c | 518 | __u32 mark; |
fa9ad96d SK |
519 | struct xfrm_state *x; |
520 | struct ip6_tnl *t; | |
521 | struct ip_esp_hdr *esph; | |
522 | struct ip_auth_hdr *ah; | |
523 | struct ip_comp_hdr *ipch; | |
524 | struct net *net = dev_net(skb->dev); | |
525 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
526 | int protocol = iph->nexthdr; | |
527 | ||
528 | t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); | |
529 | if (!t) | |
530 | return -1; | |
531 | ||
6d004d6c SK |
532 | mark = be32_to_cpu(t->parms.o_key); |
533 | ||
fa9ad96d SK |
534 | switch (protocol) { |
535 | case IPPROTO_ESP: | |
536 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
537 | spi = esph->spi; | |
538 | break; | |
539 | case IPPROTO_AH: | |
540 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
541 | spi = ah->spi; | |
542 | break; | |
543 | case IPPROTO_COMP: | |
544 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
545 | spi = htonl(ntohs(ipch->cpi)); | |
546 | break; | |
547 | default: | |
548 | return 0; | |
549 | } | |
550 | ||
551 | if (type != ICMPV6_PKT_TOOBIG && | |
552 | type != NDISC_REDIRECT) | |
553 | return 0; | |
554 | ||
6d004d6c | 555 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
fa9ad96d SK |
556 | spi, protocol, AF_INET6); |
557 | if (!x) | |
558 | return 0; | |
559 | ||
560 | if (type == NDISC_REDIRECT) | |
561 | ip6_redirect(skb, net, skb->dev->ifindex, 0); | |
562 | else | |
563 | ip6_update_pmtu(skb, net, info, 0, 0); | |
564 | xfrm_state_put(x); | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
ed1efb2a SK |
569 | static void vti6_link_config(struct ip6_tnl *t) |
570 | { | |
ed1efb2a SK |
571 | struct net_device *dev = t->dev; |
572 | struct __ip6_tnl_parm *p = &t->parms; | |
ed1efb2a SK |
573 | |
574 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
575 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
576 | ||
ed1efb2a SK |
577 | p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
578 | IP6_TNL_F_CAP_PER_PACKET); | |
579 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
580 | ||
581 | if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) | |
582 | dev->flags |= IFF_POINTOPOINT; | |
583 | else | |
584 | dev->flags &= ~IFF_POINTOPOINT; | |
585 | ||
586 | dev->iflink = p->link; | |
ed1efb2a SK |
587 | } |
588 | ||
589 | /** | |
590 | * vti6_tnl_change - update the tunnel parameters | |
591 | * @t: tunnel to be changed | |
592 | * @p: tunnel configuration parameters | |
593 | * | |
594 | * Description: | |
595 | * vti6_tnl_change() updates the tunnel parameters | |
596 | **/ | |
597 | static int | |
598 | vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) | |
599 | { | |
600 | t->parms.laddr = p->laddr; | |
601 | t->parms.raddr = p->raddr; | |
602 | t->parms.link = p->link; | |
603 | t->parms.i_key = p->i_key; | |
604 | t->parms.o_key = p->o_key; | |
605 | t->parms.proto = p->proto; | |
606 | ip6_tnl_dst_reset(t); | |
607 | vti6_link_config(t); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) | |
612 | { | |
613 | struct net *net = dev_net(t->dev); | |
614 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
615 | int err; | |
616 | ||
617 | vti6_tnl_unlink(ip6n, t); | |
618 | synchronize_net(); | |
619 | err = vti6_tnl_change(t, p); | |
620 | vti6_tnl_link(ip6n, t); | |
621 | netdev_state_change(t->dev); | |
622 | return err; | |
623 | } | |
624 | ||
625 | static void | |
626 | vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) | |
627 | { | |
628 | p->laddr = u->laddr; | |
629 | p->raddr = u->raddr; | |
630 | p->link = u->link; | |
631 | p->i_key = u->i_key; | |
632 | p->o_key = u->o_key; | |
633 | p->proto = u->proto; | |
634 | ||
635 | memcpy(p->name, u->name, sizeof(u->name)); | |
636 | } | |
637 | ||
638 | static void | |
639 | vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) | |
640 | { | |
641 | u->laddr = p->laddr; | |
642 | u->raddr = p->raddr; | |
643 | u->link = p->link; | |
644 | u->i_key = p->i_key; | |
645 | u->o_key = p->o_key; | |
646 | u->proto = p->proto; | |
647 | ||
648 | memcpy(u->name, p->name, sizeof(u->name)); | |
649 | } | |
650 | ||
651 | /** | |
652 | * vti6_tnl_ioctl - configure vti6 tunnels from userspace | |
653 | * @dev: virtual device associated with tunnel | |
654 | * @ifr: parameters passed from userspace | |
655 | * @cmd: command to be performed | |
656 | * | |
657 | * Description: | |
658 | * vti6_ioctl() is used for managing vti6 tunnels | |
659 | * from userspace. | |
660 | * | |
661 | * The possible commands are the following: | |
662 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
663 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
664 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
665 | * %SIOCDELTUNNEL: delete tunnel | |
666 | * | |
667 | * The fallback device "ip6_vti0", created during module | |
668 | * initialization, can be used for creating other tunnel devices. | |
669 | * | |
670 | * Return: | |
671 | * 0 on success, | |
672 | * %-EFAULT if unable to copy data to or from userspace, | |
673 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
674 | * %-EINVAL if passed tunnel parameters are invalid, | |
675 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
676 | * %-ENODEV if attempting to change or delete a nonexisting device | |
677 | **/ | |
678 | static int | |
679 | vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
680 | { | |
681 | int err = 0; | |
682 | struct ip6_tnl_parm2 p; | |
683 | struct __ip6_tnl_parm p1; | |
684 | struct ip6_tnl *t = NULL; | |
685 | struct net *net = dev_net(dev); | |
686 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
687 | ||
688 | switch (cmd) { | |
689 | case SIOCGETTUNNEL: | |
690 | if (dev == ip6n->fb_tnl_dev) { | |
691 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
692 | err = -EFAULT; | |
693 | break; | |
694 | } | |
695 | vti6_parm_from_user(&p1, &p); | |
696 | t = vti6_locate(net, &p1, 0); | |
697 | } else { | |
698 | memset(&p, 0, sizeof(p)); | |
699 | } | |
700 | if (t == NULL) | |
701 | t = netdev_priv(dev); | |
702 | vti6_parm_to_user(&p, &t->parms); | |
703 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
704 | err = -EFAULT; | |
705 | break; | |
706 | case SIOCADDTUNNEL: | |
707 | case SIOCCHGTUNNEL: | |
708 | err = -EPERM; | |
709 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
710 | break; | |
711 | err = -EFAULT; | |
712 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
713 | break; | |
714 | err = -EINVAL; | |
715 | if (p.proto != IPPROTO_IPV6 && p.proto != 0) | |
716 | break; | |
717 | vti6_parm_from_user(&p1, &p); | |
718 | t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
719 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
720 | if (t != NULL) { | |
721 | if (t->dev != dev) { | |
722 | err = -EEXIST; | |
723 | break; | |
724 | } | |
725 | } else | |
726 | t = netdev_priv(dev); | |
727 | ||
728 | err = vti6_update(t, &p1); | |
729 | } | |
730 | if (t) { | |
731 | err = 0; | |
732 | vti6_parm_to_user(&p, &t->parms); | |
733 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
734 | err = -EFAULT; | |
735 | ||
736 | } else | |
737 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
738 | break; | |
739 | case SIOCDELTUNNEL: | |
740 | err = -EPERM; | |
741 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
742 | break; | |
743 | ||
744 | if (dev == ip6n->fb_tnl_dev) { | |
745 | err = -EFAULT; | |
746 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
747 | break; | |
748 | err = -ENOENT; | |
749 | vti6_parm_from_user(&p1, &p); | |
750 | t = vti6_locate(net, &p1, 0); | |
751 | if (t == NULL) | |
752 | break; | |
753 | err = -EPERM; | |
754 | if (t->dev == ip6n->fb_tnl_dev) | |
755 | break; | |
756 | dev = t->dev; | |
757 | } | |
758 | err = 0; | |
759 | unregister_netdevice(dev); | |
760 | break; | |
761 | default: | |
762 | err = -EINVAL; | |
763 | } | |
764 | return err; | |
765 | } | |
766 | ||
767 | /** | |
768 | * vti6_tnl_change_mtu - change mtu manually for tunnel device | |
769 | * @dev: virtual device associated with tunnel | |
770 | * @new_mtu: the new mtu | |
771 | * | |
772 | * Return: | |
773 | * 0 on success, | |
774 | * %-EINVAL if mtu too small | |
775 | **/ | |
776 | static int vti6_change_mtu(struct net_device *dev, int new_mtu) | |
777 | { | |
778 | if (new_mtu < IPV6_MIN_MTU) | |
779 | return -EINVAL; | |
780 | ||
781 | dev->mtu = new_mtu; | |
782 | return 0; | |
783 | } | |
784 | ||
785 | static const struct net_device_ops vti6_netdev_ops = { | |
786 | .ndo_uninit = vti6_dev_uninit, | |
787 | .ndo_start_xmit = vti6_tnl_xmit, | |
788 | .ndo_do_ioctl = vti6_ioctl, | |
789 | .ndo_change_mtu = vti6_change_mtu, | |
469bdcef | 790 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ed1efb2a SK |
791 | }; |
792 | ||
793 | /** | |
794 | * vti6_dev_setup - setup virtual tunnel device | |
795 | * @dev: virtual device associated with tunnel | |
796 | * | |
797 | * Description: | |
798 | * Initialize function pointers and device parameters | |
799 | **/ | |
800 | static void vti6_dev_setup(struct net_device *dev) | |
801 | { | |
ed1efb2a SK |
802 | dev->netdev_ops = &vti6_netdev_ops; |
803 | dev->destructor = vti6_dev_free; | |
804 | ||
805 | dev->type = ARPHRD_TUNNEL6; | |
806 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); | |
807 | dev->mtu = ETH_DATA_LEN; | |
ed1efb2a SK |
808 | dev->flags |= IFF_NOARP; |
809 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 810 | netif_keep_dst(dev); |
ed1efb2a SK |
811 | } |
812 | ||
813 | /** | |
814 | * vti6_dev_init_gen - general initializer for all tunnel devices | |
815 | * @dev: virtual device associated with tunnel | |
816 | **/ | |
817 | static inline int vti6_dev_init_gen(struct net_device *dev) | |
818 | { | |
819 | struct ip6_tnl *t = netdev_priv(dev); | |
820 | ||
821 | t->dev = dev; | |
822 | t->net = dev_net(dev); | |
1c213bd2 | 823 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
ed1efb2a SK |
824 | if (!dev->tstats) |
825 | return -ENOMEM; | |
826 | return 0; | |
827 | } | |
828 | ||
829 | /** | |
830 | * vti6_dev_init - initializer for all non fallback tunnel devices | |
831 | * @dev: virtual device associated with tunnel | |
832 | **/ | |
833 | static int vti6_dev_init(struct net_device *dev) | |
834 | { | |
835 | struct ip6_tnl *t = netdev_priv(dev); | |
836 | int err = vti6_dev_init_gen(dev); | |
837 | ||
838 | if (err) | |
839 | return err; | |
840 | vti6_link_config(t); | |
841 | return 0; | |
842 | } | |
843 | ||
844 | /** | |
845 | * vti6_fb_tnl_dev_init - initializer for fallback tunnel device | |
846 | * @dev: fallback device | |
847 | * | |
848 | * Return: 0 | |
849 | **/ | |
850 | static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) | |
851 | { | |
852 | struct ip6_tnl *t = netdev_priv(dev); | |
853 | struct net *net = dev_net(dev); | |
854 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
855 | int err = vti6_dev_init_gen(dev); | |
856 | ||
857 | if (err) | |
858 | return err; | |
859 | ||
860 | t->parms.proto = IPPROTO_IPV6; | |
861 | dev_hold(dev); | |
862 | ||
863 | vti6_link_config(t); | |
864 | ||
865 | rcu_assign_pointer(ip6n->tnls_wc[0], t); | |
866 | return 0; | |
867 | } | |
868 | ||
869 | static int vti6_validate(struct nlattr *tb[], struct nlattr *data[]) | |
870 | { | |
871 | return 0; | |
872 | } | |
873 | ||
874 | static void vti6_netlink_parms(struct nlattr *data[], | |
875 | struct __ip6_tnl_parm *parms) | |
876 | { | |
877 | memset(parms, 0, sizeof(*parms)); | |
878 | ||
879 | if (!data) | |
880 | return; | |
881 | ||
882 | if (data[IFLA_VTI_LINK]) | |
883 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
884 | ||
885 | if (data[IFLA_VTI_LOCAL]) | |
886 | nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL], | |
887 | sizeof(struct in6_addr)); | |
888 | ||
889 | if (data[IFLA_VTI_REMOTE]) | |
890 | nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE], | |
891 | sizeof(struct in6_addr)); | |
892 | ||
893 | if (data[IFLA_VTI_IKEY]) | |
894 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
895 | ||
896 | if (data[IFLA_VTI_OKEY]) | |
897 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
898 | } | |
899 | ||
900 | static int vti6_newlink(struct net *src_net, struct net_device *dev, | |
901 | struct nlattr *tb[], struct nlattr *data[]) | |
902 | { | |
903 | struct net *net = dev_net(dev); | |
904 | struct ip6_tnl *nt; | |
905 | ||
906 | nt = netdev_priv(dev); | |
907 | vti6_netlink_parms(data, &nt->parms); | |
908 | ||
909 | nt->parms.proto = IPPROTO_IPV6; | |
910 | ||
911 | if (vti6_locate(net, &nt->parms, 0)) | |
912 | return -EEXIST; | |
913 | ||
914 | return vti6_tnl_create2(dev); | |
915 | } | |
916 | ||
917 | static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], | |
918 | struct nlattr *data[]) | |
919 | { | |
920 | struct ip6_tnl *t; | |
921 | struct __ip6_tnl_parm p; | |
922 | struct net *net = dev_net(dev); | |
923 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
924 | ||
925 | if (dev == ip6n->fb_tnl_dev) | |
926 | return -EINVAL; | |
927 | ||
928 | vti6_netlink_parms(data, &p); | |
929 | ||
930 | t = vti6_locate(net, &p, 0); | |
931 | ||
932 | if (t) { | |
933 | if (t->dev != dev) | |
934 | return -EEXIST; | |
935 | } else | |
936 | t = netdev_priv(dev); | |
937 | ||
938 | return vti6_update(t, &p); | |
939 | } | |
940 | ||
941 | static size_t vti6_get_size(const struct net_device *dev) | |
942 | { | |
943 | return | |
944 | /* IFLA_VTI_LINK */ | |
945 | nla_total_size(4) + | |
946 | /* IFLA_VTI_LOCAL */ | |
947 | nla_total_size(sizeof(struct in6_addr)) + | |
948 | /* IFLA_VTI_REMOTE */ | |
949 | nla_total_size(sizeof(struct in6_addr)) + | |
950 | /* IFLA_VTI_IKEY */ | |
951 | nla_total_size(4) + | |
952 | /* IFLA_VTI_OKEY */ | |
953 | nla_total_size(4) + | |
954 | 0; | |
955 | } | |
956 | ||
957 | static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
958 | { | |
959 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
960 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
961 | ||
962 | if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || | |
963 | nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr), | |
964 | &parm->laddr) || | |
965 | nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr), | |
966 | &parm->raddr) || | |
967 | nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || | |
968 | nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key)) | |
969 | goto nla_put_failure; | |
970 | return 0; | |
971 | ||
972 | nla_put_failure: | |
973 | return -EMSGSIZE; | |
974 | } | |
975 | ||
976 | static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { | |
977 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
978 | [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
979 | [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
980 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
981 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
982 | }; | |
983 | ||
984 | static struct rtnl_link_ops vti6_link_ops __read_mostly = { | |
985 | .kind = "vti6", | |
986 | .maxtype = IFLA_VTI_MAX, | |
987 | .policy = vti6_policy, | |
988 | .priv_size = sizeof(struct ip6_tnl), | |
989 | .setup = vti6_dev_setup, | |
990 | .validate = vti6_validate, | |
991 | .newlink = vti6_newlink, | |
992 | .changelink = vti6_changelink, | |
993 | .get_size = vti6_get_size, | |
994 | .fill_info = vti6_fill_info, | |
995 | }; | |
996 | ||
ed1efb2a SK |
997 | static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) |
998 | { | |
999 | int h; | |
1000 | struct ip6_tnl *t; | |
1001 | LIST_HEAD(list); | |
1002 | ||
1003 | for (h = 0; h < HASH_SIZE; h++) { | |
1004 | t = rtnl_dereference(ip6n->tnls_r_l[h]); | |
1005 | while (t != NULL) { | |
1006 | unregister_netdevice_queue(t->dev, &list); | |
1007 | t = rtnl_dereference(t->next); | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | t = rtnl_dereference(ip6n->tnls_wc[0]); | |
1012 | unregister_netdevice_queue(t->dev, &list); | |
1013 | unregister_netdevice_many(&list); | |
1014 | } | |
1015 | ||
1016 | static int __net_init vti6_init_net(struct net *net) | |
1017 | { | |
1018 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1019 | struct ip6_tnl *t = NULL; | |
1020 | int err; | |
1021 | ||
1022 | ip6n->tnls[0] = ip6n->tnls_wc; | |
1023 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1024 | ||
1025 | err = -ENOMEM; | |
1026 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", | |
c835a677 | 1027 | NET_NAME_UNKNOWN, vti6_dev_setup); |
ed1efb2a SK |
1028 | |
1029 | if (!ip6n->fb_tnl_dev) | |
1030 | goto err_alloc_dev; | |
1031 | dev_net_set(ip6n->fb_tnl_dev, net); | |
1032 | ||
1033 | err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); | |
1034 | if (err < 0) | |
1035 | goto err_register; | |
1036 | ||
1037 | err = register_netdev(ip6n->fb_tnl_dev); | |
1038 | if (err < 0) | |
1039 | goto err_register; | |
1040 | ||
1041 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1042 | ||
1043 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
1044 | return 0; | |
1045 | ||
1046 | err_register: | |
1047 | vti6_dev_free(ip6n->fb_tnl_dev); | |
1048 | err_alloc_dev: | |
1049 | return err; | |
1050 | } | |
1051 | ||
1052 | static void __net_exit vti6_exit_net(struct net *net) | |
1053 | { | |
1054 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1055 | ||
1056 | rtnl_lock(); | |
1057 | vti6_destroy_tunnels(ip6n); | |
1058 | rtnl_unlock(); | |
1059 | } | |
1060 | ||
1061 | static struct pernet_operations vti6_net_ops = { | |
1062 | .init = vti6_init_net, | |
1063 | .exit = vti6_exit_net, | |
1064 | .id = &vti6_net_id, | |
1065 | .size = sizeof(struct vti6_net), | |
1066 | }; | |
1067 | ||
fa9ad96d SK |
1068 | static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
1069 | .handler = vti6_rcv, | |
1070 | .cb_handler = vti6_rcv_cb, | |
1071 | .err_handler = vti6_err, | |
1072 | .priority = 100, | |
1073 | }; | |
1074 | ||
1075 | static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { | |
1076 | .handler = vti6_rcv, | |
1077 | .cb_handler = vti6_rcv_cb, | |
1078 | .err_handler = vti6_err, | |
1079 | .priority = 100, | |
1080 | }; | |
1081 | ||
1082 | static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { | |
1083 | .handler = vti6_rcv, | |
1084 | .cb_handler = vti6_rcv_cb, | |
1085 | .err_handler = vti6_err, | |
1086 | .priority = 100, | |
1087 | }; | |
1088 | ||
ed1efb2a SK |
1089 | /** |
1090 | * vti6_tunnel_init - register protocol and reserve needed resources | |
1091 | * | |
1092 | * Return: 0 on success | |
1093 | **/ | |
1094 | static int __init vti6_tunnel_init(void) | |
1095 | { | |
e59d82fd MK |
1096 | const char *msg; |
1097 | int err; | |
ed1efb2a | 1098 | |
e59d82fd | 1099 | msg = "tunnel device"; |
ed1efb2a SK |
1100 | err = register_pernet_device(&vti6_net_ops); |
1101 | if (err < 0) | |
e59d82fd | 1102 | goto pernet_dev_failed; |
ed1efb2a | 1103 | |
e59d82fd | 1104 | msg = "tunnel protocols"; |
fa9ad96d | 1105 | err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd MK |
1106 | if (err < 0) |
1107 | goto xfrm_proto_esp_failed; | |
fa9ad96d | 1108 | err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd MK |
1109 | if (err < 0) |
1110 | goto xfrm_proto_ah_failed; | |
fa9ad96d | 1111 | err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd MK |
1112 | if (err < 0) |
1113 | goto xfrm_proto_comp_failed; | |
fa9ad96d | 1114 | |
e59d82fd | 1115 | msg = "netlink interface"; |
ed1efb2a SK |
1116 | err = rtnl_link_register(&vti6_link_ops); |
1117 | if (err < 0) | |
1118 | goto rtnl_link_failed; | |
1119 | ||
1120 | return 0; | |
1121 | ||
1122 | rtnl_link_failed: | |
fa9ad96d | 1123 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd | 1124 | xfrm_proto_comp_failed: |
fa9ad96d | 1125 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd | 1126 | xfrm_proto_ah_failed: |
fa9ad96d | 1127 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd | 1128 | xfrm_proto_esp_failed: |
ed1efb2a | 1129 | unregister_pernet_device(&vti6_net_ops); |
e59d82fd MK |
1130 | pernet_dev_failed: |
1131 | pr_err("vti6 init: failed to register %s\n", msg); | |
ed1efb2a SK |
1132 | return err; |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * vti6_tunnel_cleanup - free resources and unregister protocol | |
1137 | **/ | |
1138 | static void __exit vti6_tunnel_cleanup(void) | |
1139 | { | |
1140 | rtnl_link_unregister(&vti6_link_ops); | |
e59d82fd MK |
1141 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
1142 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); | |
1143 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); | |
ed1efb2a SK |
1144 | unregister_pernet_device(&vti6_net_ops); |
1145 | } | |
1146 | ||
1147 | module_init(vti6_tunnel_init); | |
1148 | module_exit(vti6_tunnel_cleanup); | |
1149 | MODULE_LICENSE("GPL"); | |
1150 | MODULE_ALIAS_RTNL_LINK("vti6"); | |
1151 | MODULE_ALIAS_NETDEV("ip6_vti0"); | |
1152 | MODULE_AUTHOR("Steffen Klassert"); | |
1153 | MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); |