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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> | |
45ce0fd1 | 52 | #include <linux/etherdevice.h> |
ed1efb2a | 53 | |
e87a8f24 JK |
54 | #define IP6_VTI_HASH_SIZE_SHIFT 5 |
55 | #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT) | |
ed1efb2a SK |
56 | |
57 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) | |
58 | { | |
59 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
60 | ||
e87a8f24 | 61 | return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT); |
ed1efb2a SK |
62 | } |
63 | ||
64 | static int vti6_dev_init(struct net_device *dev); | |
65 | static void vti6_dev_setup(struct net_device *dev); | |
66 | static struct rtnl_link_ops vti6_link_ops __read_mostly; | |
67 | ||
c7d03a00 | 68 | static unsigned int vti6_net_id __read_mostly; |
ed1efb2a SK |
69 | struct vti6_net { |
70 | /* the vti6 tunnel fallback device */ | |
71 | struct net_device *fb_tnl_dev; | |
72 | /* lists for storing tunnels in use */ | |
e87a8f24 | 73 | struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE]; |
ed1efb2a SK |
74 | struct ip6_tnl __rcu *tnls_wc[1]; |
75 | struct ip6_tnl __rcu **tnls[2]; | |
76 | }; | |
77 | ||
ed1efb2a SK |
78 | #define for_each_vti6_tunnel_rcu(start) \ |
79 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
80 | ||
81 | /** | |
82 | * vti6_tnl_lookup - fetch tunnel matching the end-point addresses | |
83 | * @net: network namespace | |
84 | * @remote: the address of the tunnel exit-point | |
85 | * @local: the address of the tunnel entry-point | |
86 | * | |
87 | * Return: | |
88 | * tunnel matching given end-points if found, | |
89 | * else fallback tunnel if its device is up, | |
90 | * else %NULL | |
91 | **/ | |
92 | static struct ip6_tnl * | |
93 | vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, | |
94 | const struct in6_addr *local) | |
95 | { | |
96 | unsigned int hash = HASH(remote, local); | |
97 | struct ip6_tnl *t; | |
98 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
fbe68ee8 | 99 | struct in6_addr any; |
ed1efb2a SK |
100 | |
101 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
102 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
103 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
104 | (t->dev->flags & IFF_UP)) | |
105 | return t; | |
106 | } | |
fbe68ee8 SK |
107 | |
108 | memset(&any, 0, sizeof(any)); | |
109 | hash = HASH(&any, local); | |
110 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
111 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
112 | (t->dev->flags & IFF_UP)) | |
113 | return t; | |
114 | } | |
115 | ||
116 | hash = HASH(remote, &any); | |
117 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
118 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
119 | (t->dev->flags & IFF_UP)) | |
120 | return t; | |
121 | } | |
122 | ||
ed1efb2a SK |
123 | t = rcu_dereference(ip6n->tnls_wc[0]); |
124 | if (t && (t->dev->flags & IFF_UP)) | |
125 | return t; | |
126 | ||
127 | return NULL; | |
128 | } | |
129 | ||
130 | /** | |
131 | * vti6_tnl_bucket - get head of list matching given tunnel parameters | |
132 | * @p: parameters containing tunnel end-points | |
133 | * | |
134 | * Description: | |
135 | * vti6_tnl_bucket() returns the head of the list matching the | |
136 | * &struct in6_addr entries laddr and raddr in @p. | |
137 | * | |
138 | * Return: head of IPv6 tunnel list | |
139 | **/ | |
140 | static struct ip6_tnl __rcu ** | |
141 | vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p) | |
142 | { | |
143 | const struct in6_addr *remote = &p->raddr; | |
144 | const struct in6_addr *local = &p->laddr; | |
145 | unsigned int h = 0; | |
146 | int prio = 0; | |
147 | ||
148 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
149 | prio = 1; | |
150 | h = HASH(remote, local); | |
151 | } | |
152 | return &ip6n->tnls[prio][h]; | |
153 | } | |
154 | ||
155 | static void | |
156 | vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t) | |
157 | { | |
158 | struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms); | |
159 | ||
160 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); | |
161 | rcu_assign_pointer(*tp, t); | |
162 | } | |
163 | ||
164 | static void | |
165 | vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t) | |
166 | { | |
167 | struct ip6_tnl __rcu **tp; | |
168 | struct ip6_tnl *iter; | |
169 | ||
170 | for (tp = vti6_tnl_bucket(ip6n, &t->parms); | |
171 | (iter = rtnl_dereference(*tp)) != NULL; | |
172 | tp = &iter->next) { | |
173 | if (t == iter) { | |
174 | rcu_assign_pointer(*tp, t->next); | |
175 | break; | |
176 | } | |
177 | } | |
178 | } | |
179 | ||
180 | static void vti6_dev_free(struct net_device *dev) | |
181 | { | |
182 | free_percpu(dev->tstats); | |
ed1efb2a SK |
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 | ||
93e246f7 | 192 | dev->rtnl_link_ops = &vti6_link_ops; |
ed1efb2a SK |
193 | err = register_netdevice(dev); |
194 | if (err < 0) | |
195 | goto out; | |
196 | ||
197 | strcpy(t->parms.name, dev->name); | |
ed1efb2a SK |
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: | |
cf124db5 | 237 | free_netdev(dev); |
ed1efb2a SK |
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 | ||
ed1efb2a | 324 | rcu_read_unlock(); |
fa9ad96d | 325 | |
63c43787 | 326 | return xfrm6_rcv_tnl(skb, t); |
ed1efb2a SK |
327 | } |
328 | rcu_read_unlock(); | |
fa9ad96d | 329 | return -EINVAL; |
ed1efb2a SK |
330 | discard: |
331 | kfree_skb(skb); | |
332 | return 0; | |
333 | } | |
334 | ||
fa9ad96d SK |
335 | static int vti6_rcv_cb(struct sk_buff *skb, int err) |
336 | { | |
337 | unsigned short family; | |
338 | struct net_device *dev; | |
339 | struct pcpu_sw_netstats *tstats; | |
340 | struct xfrm_state *x; | |
1fb81e09 | 341 | struct xfrm_mode *inner_mode; |
fa9ad96d | 342 | struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; |
d55c670c AD |
343 | u32 orig_mark = skb->mark; |
344 | int ret; | |
fa9ad96d SK |
345 | |
346 | if (!t) | |
347 | return 1; | |
348 | ||
349 | dev = t->dev; | |
350 | ||
351 | if (err) { | |
352 | dev->stats.rx_errors++; | |
353 | dev->stats.rx_dropped++; | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | x = xfrm_input_state(skb); | |
1fb81e09 | 359 | |
360 | inner_mode = x->inner_mode; | |
361 | ||
362 | if (x->sel.family == AF_UNSPEC) { | |
363 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
364 | if (inner_mode == NULL) { | |
365 | XFRM_INC_STATS(dev_net(skb->dev), | |
366 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
367 | return -EINVAL; | |
368 | } | |
369 | } | |
370 | ||
371 | family = inner_mode->afinfo->family; | |
fa9ad96d | 372 | |
d55c670c AD |
373 | skb->mark = be32_to_cpu(t->parms.i_key); |
374 | ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); | |
375 | skb->mark = orig_mark; | |
376 | ||
377 | if (!ret) | |
fa9ad96d SK |
378 | return -EPERM; |
379 | ||
380 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); | |
381 | skb->dev = dev; | |
382 | ||
383 | tstats = this_cpu_ptr(dev->tstats); | |
384 | u64_stats_update_begin(&tstats->syncp); | |
385 | tstats->rx_packets++; | |
386 | tstats->rx_bytes += skb->len; | |
387 | u64_stats_update_end(&tstats->syncp); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
ed1efb2a SK |
392 | /** |
393 | * vti6_addr_conflict - compare packet addresses to tunnel's own | |
394 | * @t: the outgoing tunnel device | |
395 | * @hdr: IPv6 header from the incoming packet | |
396 | * | |
397 | * Description: | |
398 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
399 | * doesn't match source of incoming packet. | |
400 | * | |
401 | * Return: | |
402 | * 1 if conflict, | |
403 | * 0 else | |
404 | **/ | |
405 | static inline bool | |
406 | vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) | |
407 | { | |
408 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
409 | } | |
410 | ||
26be8e2d SK |
411 | static bool vti6_state_check(const struct xfrm_state *x, |
412 | const struct in6_addr *dst, | |
413 | const struct in6_addr *src) | |
414 | { | |
415 | xfrm_address_t *daddr = (xfrm_address_t *)dst; | |
416 | xfrm_address_t *saddr = (xfrm_address_t *)src; | |
417 | ||
418 | /* if there is no transform then this tunnel is not functional. | |
419 | * Or if the xfrm is not mode tunnel. | |
420 | */ | |
421 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
422 | x->props.family != AF_INET6) | |
423 | return false; | |
424 | ||
425 | if (ipv6_addr_any(dst)) | |
426 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); | |
427 | ||
428 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) | |
429 | return false; | |
430 | ||
431 | return true; | |
432 | } | |
433 | ||
ed1efb2a SK |
434 | /** |
435 | * vti6_xmit - send a packet | |
436 | * @skb: the outgoing socket buffer | |
437 | * @dev: the outgoing tunnel device | |
22e1b23d | 438 | * @fl: the flow informations for the xfrm_lookup |
ed1efb2a | 439 | **/ |
22e1b23d SK |
440 | static int |
441 | vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
ed1efb2a | 442 | { |
ed1efb2a SK |
443 | struct ip6_tnl *t = netdev_priv(dev); |
444 | struct net_device_stats *stats = &t->dev->stats; | |
7c852581 | 445 | struct dst_entry *dst = skb_dst(skb); |
ed1efb2a | 446 | struct net_device *tdev; |
d5005140 | 447 | struct xfrm_state *x; |
36f6ee22 | 448 | int pkt_len = skb->len; |
ed1efb2a | 449 | int err = -1; |
ccd740cb | 450 | int mtu; |
ed1efb2a | 451 | |
7c852581 SK |
452 | if (!dst) |
453 | goto tx_err_link_failure; | |
ed1efb2a | 454 | |
7c852581 | 455 | dst_hold(dst); |
22e1b23d | 456 | dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
7c852581 SK |
457 | if (IS_ERR(dst)) { |
458 | err = PTR_ERR(dst); | |
459 | dst = NULL; | |
460 | goto tx_err_link_failure; | |
ed1efb2a SK |
461 | } |
462 | ||
d5005140 SK |
463 | x = dst->xfrm; |
464 | if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) | |
465 | goto tx_err_link_failure; | |
466 | ||
467 | if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, | |
468 | (const struct in6_addr *)&x->id.daddr)) | |
ed1efb2a SK |
469 | goto tx_err_link_failure; |
470 | ||
471 | tdev = dst->dev; | |
472 | ||
473 | if (tdev == dev) { | |
474 | stats->collisions++; | |
475 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
476 | t->parms.name); | |
477 | goto tx_err_dst_release; | |
478 | } | |
479 | ||
7c852581 SK |
480 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
481 | skb_dst_set(skb, dst); | |
482 | skb->dev = skb_dst(skb)->dev; | |
ed1efb2a | 483 | |
ccd740cb SK |
484 | mtu = dst_mtu(dst); |
485 | if (!skb->ignore_df && skb->len > mtu) { | |
486 | skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu); | |
487 | ||
e3dc847a SK |
488 | if (skb->protocol == htons(ETH_P_IPV6)) { |
489 | if (mtu < IPV6_MIN_MTU) | |
490 | mtu = IPV6_MIN_MTU; | |
491 | ||
ccd740cb | 492 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
e3dc847a | 493 | } else { |
ccd740cb SK |
494 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
495 | htonl(mtu)); | |
e3dc847a | 496 | } |
ccd740cb SK |
497 | |
498 | return -EMSGSIZE; | |
499 | } | |
500 | ||
13206b6b | 501 | err = dst_output(t->net, skb->sk, skb); |
22e1b23d SK |
502 | if (net_xmit_eval(err) == 0) { |
503 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
504 | ||
505 | u64_stats_update_begin(&tstats->syncp); | |
36f6ee22 | 506 | tstats->tx_bytes += pkt_len; |
22e1b23d SK |
507 | tstats->tx_packets++; |
508 | u64_stats_update_end(&tstats->syncp); | |
509 | } else { | |
510 | stats->tx_errors++; | |
511 | stats->tx_aborted_errors++; | |
512 | } | |
ed1efb2a SK |
513 | |
514 | return 0; | |
515 | tx_err_link_failure: | |
516 | stats->tx_carrier_errors++; | |
517 | dst_link_failure(skb); | |
518 | tx_err_dst_release: | |
7c852581 | 519 | dst_release(dst); |
ed1efb2a SK |
520 | return err; |
521 | } | |
522 | ||
523 | static netdev_tx_t | |
524 | vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
525 | { | |
526 | struct ip6_tnl *t = netdev_priv(dev); | |
527 | struct net_device_stats *stats = &t->dev->stats; | |
22e1b23d SK |
528 | struct ipv6hdr *ipv6h; |
529 | struct flowi fl; | |
ed1efb2a SK |
530 | int ret; |
531 | ||
22e1b23d | 532 | memset(&fl, 0, sizeof(fl)); |
22e1b23d | 533 | |
ed1efb2a SK |
534 | switch (skb->protocol) { |
535 | case htons(ETH_P_IPV6): | |
22e1b23d SK |
536 | ipv6h = ipv6_hdr(skb); |
537 | ||
538 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || | |
d5005140 | 539 | vti6_addr_conflict(t, ipv6h)) |
22e1b23d SK |
540 | goto tx_err; |
541 | ||
542 | xfrm_decode_session(skb, &fl, AF_INET6); | |
543 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
544 | break; | |
545 | case htons(ETH_P_IP): | |
546 | xfrm_decode_session(skb, &fl, AF_INET); | |
547 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
ed1efb2a SK |
548 | break; |
549 | default: | |
550 | goto tx_err; | |
551 | } | |
552 | ||
cd5279c1 AD |
553 | /* override mark with tunnel output key */ |
554 | fl.flowi_mark = be32_to_cpu(t->parms.o_key); | |
555 | ||
22e1b23d | 556 | ret = vti6_xmit(skb, dev, &fl); |
ed1efb2a SK |
557 | if (ret < 0) |
558 | goto tx_err; | |
559 | ||
560 | return NETDEV_TX_OK; | |
561 | ||
562 | tx_err: | |
563 | stats->tx_errors++; | |
564 | stats->tx_dropped++; | |
565 | kfree_skb(skb); | |
566 | return NETDEV_TX_OK; | |
567 | } | |
568 | ||
fa9ad96d SK |
569 | static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
570 | u8 type, u8 code, int offset, __be32 info) | |
571 | { | |
572 | __be32 spi; | |
6d004d6c | 573 | __u32 mark; |
fa9ad96d SK |
574 | struct xfrm_state *x; |
575 | struct ip6_tnl *t; | |
576 | struct ip_esp_hdr *esph; | |
577 | struct ip_auth_hdr *ah; | |
578 | struct ip_comp_hdr *ipch; | |
579 | struct net *net = dev_net(skb->dev); | |
580 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
581 | int protocol = iph->nexthdr; | |
582 | ||
583 | t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); | |
584 | if (!t) | |
585 | return -1; | |
586 | ||
6d004d6c SK |
587 | mark = be32_to_cpu(t->parms.o_key); |
588 | ||
fa9ad96d SK |
589 | switch (protocol) { |
590 | case IPPROTO_ESP: | |
591 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
592 | spi = esph->spi; | |
593 | break; | |
594 | case IPPROTO_AH: | |
595 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
596 | spi = ah->spi; | |
597 | break; | |
598 | case IPPROTO_COMP: | |
599 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
600 | spi = htonl(ntohs(ipch->cpi)); | |
601 | break; | |
602 | default: | |
603 | return 0; | |
604 | } | |
605 | ||
606 | if (type != ICMPV6_PKT_TOOBIG && | |
607 | type != NDISC_REDIRECT) | |
608 | return 0; | |
609 | ||
6d004d6c | 610 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
fa9ad96d SK |
611 | spi, protocol, AF_INET6); |
612 | if (!x) | |
613 | return 0; | |
614 | ||
615 | if (type == NDISC_REDIRECT) | |
e2d118a1 LC |
616 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
617 | sock_net_uid(net, NULL)); | |
fa9ad96d | 618 | else |
e2d118a1 | 619 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
fa9ad96d SK |
620 | xfrm_state_put(x); |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
ed1efb2a SK |
625 | static void vti6_link_config(struct ip6_tnl *t) |
626 | { | |
ed1efb2a SK |
627 | struct net_device *dev = t->dev; |
628 | struct __ip6_tnl_parm *p = &t->parms; | |
ed1efb2a SK |
629 | |
630 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
631 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
632 | ||
ed1efb2a SK |
633 | p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
634 | IP6_TNL_F_CAP_PER_PACKET); | |
635 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
636 | ||
637 | if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) | |
638 | dev->flags |= IFF_POINTOPOINT; | |
639 | else | |
640 | dev->flags &= ~IFF_POINTOPOINT; | |
ed1efb2a SK |
641 | } |
642 | ||
643 | /** | |
644 | * vti6_tnl_change - update the tunnel parameters | |
645 | * @t: tunnel to be changed | |
646 | * @p: tunnel configuration parameters | |
647 | * | |
648 | * Description: | |
649 | * vti6_tnl_change() updates the tunnel parameters | |
650 | **/ | |
651 | static int | |
652 | vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) | |
653 | { | |
654 | t->parms.laddr = p->laddr; | |
655 | t->parms.raddr = p->raddr; | |
656 | t->parms.link = p->link; | |
657 | t->parms.i_key = p->i_key; | |
658 | t->parms.o_key = p->o_key; | |
659 | t->parms.proto = p->proto; | |
0a473b82 | 660 | t->parms.fwmark = p->fwmark; |
607f725f | 661 | dst_cache_reset(&t->dst_cache); |
ed1efb2a SK |
662 | vti6_link_config(t); |
663 | return 0; | |
664 | } | |
665 | ||
666 | static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) | |
667 | { | |
668 | struct net *net = dev_net(t->dev); | |
669 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
670 | int err; | |
671 | ||
672 | vti6_tnl_unlink(ip6n, t); | |
673 | synchronize_net(); | |
674 | err = vti6_tnl_change(t, p); | |
675 | vti6_tnl_link(ip6n, t); | |
676 | netdev_state_change(t->dev); | |
677 | return err; | |
678 | } | |
679 | ||
680 | static void | |
681 | vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) | |
682 | { | |
683 | p->laddr = u->laddr; | |
684 | p->raddr = u->raddr; | |
685 | p->link = u->link; | |
686 | p->i_key = u->i_key; | |
687 | p->o_key = u->o_key; | |
688 | p->proto = u->proto; | |
689 | ||
690 | memcpy(p->name, u->name, sizeof(u->name)); | |
691 | } | |
692 | ||
693 | static void | |
694 | vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) | |
695 | { | |
696 | u->laddr = p->laddr; | |
697 | u->raddr = p->raddr; | |
698 | u->link = p->link; | |
699 | u->i_key = p->i_key; | |
700 | u->o_key = p->o_key; | |
7dcdf941 DF |
701 | if (u->i_key) |
702 | u->i_flags |= GRE_KEY; | |
703 | if (u->o_key) | |
704 | u->o_flags |= GRE_KEY; | |
ed1efb2a SK |
705 | u->proto = p->proto; |
706 | ||
707 | memcpy(u->name, p->name, sizeof(u->name)); | |
708 | } | |
709 | ||
710 | /** | |
711 | * vti6_tnl_ioctl - configure vti6 tunnels from userspace | |
712 | * @dev: virtual device associated with tunnel | |
713 | * @ifr: parameters passed from userspace | |
714 | * @cmd: command to be performed | |
715 | * | |
716 | * Description: | |
717 | * vti6_ioctl() is used for managing vti6 tunnels | |
718 | * from userspace. | |
719 | * | |
720 | * The possible commands are the following: | |
721 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
722 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
723 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
724 | * %SIOCDELTUNNEL: delete tunnel | |
725 | * | |
726 | * The fallback device "ip6_vti0", created during module | |
727 | * initialization, can be used for creating other tunnel devices. | |
728 | * | |
729 | * Return: | |
730 | * 0 on success, | |
731 | * %-EFAULT if unable to copy data to or from userspace, | |
732 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
733 | * %-EINVAL if passed tunnel parameters are invalid, | |
734 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
735 | * %-ENODEV if attempting to change or delete a nonexisting device | |
736 | **/ | |
737 | static int | |
738 | vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
739 | { | |
740 | int err = 0; | |
741 | struct ip6_tnl_parm2 p; | |
742 | struct __ip6_tnl_parm p1; | |
743 | struct ip6_tnl *t = NULL; | |
744 | struct net *net = dev_net(dev); | |
745 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
746 | ||
747 | switch (cmd) { | |
748 | case SIOCGETTUNNEL: | |
749 | if (dev == ip6n->fb_tnl_dev) { | |
750 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
751 | err = -EFAULT; | |
752 | break; | |
753 | } | |
754 | vti6_parm_from_user(&p1, &p); | |
755 | t = vti6_locate(net, &p1, 0); | |
756 | } else { | |
757 | memset(&p, 0, sizeof(p)); | |
758 | } | |
63159f29 | 759 | if (!t) |
ed1efb2a SK |
760 | t = netdev_priv(dev); |
761 | vti6_parm_to_user(&p, &t->parms); | |
762 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
763 | err = -EFAULT; | |
764 | break; | |
765 | case SIOCADDTUNNEL: | |
766 | case SIOCCHGTUNNEL: | |
767 | err = -EPERM; | |
768 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
769 | break; | |
770 | err = -EFAULT; | |
771 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
772 | break; | |
773 | err = -EINVAL; | |
774 | if (p.proto != IPPROTO_IPV6 && p.proto != 0) | |
775 | break; | |
776 | vti6_parm_from_user(&p1, &p); | |
777 | t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
778 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
53b24b8f | 779 | if (t) { |
ed1efb2a SK |
780 | if (t->dev != dev) { |
781 | err = -EEXIST; | |
782 | break; | |
783 | } | |
784 | } else | |
785 | t = netdev_priv(dev); | |
786 | ||
787 | err = vti6_update(t, &p1); | |
788 | } | |
789 | if (t) { | |
790 | err = 0; | |
791 | vti6_parm_to_user(&p, &t->parms); | |
792 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
793 | err = -EFAULT; | |
794 | ||
795 | } else | |
796 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
797 | break; | |
798 | case SIOCDELTUNNEL: | |
799 | err = -EPERM; | |
800 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
801 | break; | |
802 | ||
803 | if (dev == ip6n->fb_tnl_dev) { | |
804 | err = -EFAULT; | |
805 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
806 | break; | |
807 | err = -ENOENT; | |
808 | vti6_parm_from_user(&p1, &p); | |
809 | t = vti6_locate(net, &p1, 0); | |
63159f29 | 810 | if (!t) |
ed1efb2a SK |
811 | break; |
812 | err = -EPERM; | |
813 | if (t->dev == ip6n->fb_tnl_dev) | |
814 | break; | |
815 | dev = t->dev; | |
816 | } | |
817 | err = 0; | |
818 | unregister_netdevice(dev); | |
819 | break; | |
820 | default: | |
821 | err = -EINVAL; | |
822 | } | |
823 | return err; | |
824 | } | |
825 | ||
ed1efb2a | 826 | static const struct net_device_ops vti6_netdev_ops = { |
16a0231b | 827 | .ndo_init = vti6_dev_init, |
ed1efb2a SK |
828 | .ndo_uninit = vti6_dev_uninit, |
829 | .ndo_start_xmit = vti6_tnl_xmit, | |
830 | .ndo_do_ioctl = vti6_ioctl, | |
469bdcef | 831 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 832 | .ndo_get_iflink = ip6_tnl_get_iflink, |
ed1efb2a SK |
833 | }; |
834 | ||
835 | /** | |
836 | * vti6_dev_setup - setup virtual tunnel device | |
837 | * @dev: virtual device associated with tunnel | |
838 | * | |
839 | * Description: | |
840 | * Initialize function pointers and device parameters | |
841 | **/ | |
842 | static void vti6_dev_setup(struct net_device *dev) | |
843 | { | |
ed1efb2a | 844 | dev->netdev_ops = &vti6_netdev_ops; |
cf124db5 DM |
845 | dev->needs_free_netdev = true; |
846 | dev->priv_destructor = vti6_dev_free; | |
ed1efb2a SK |
847 | |
848 | dev->type = ARPHRD_TUNNEL6; | |
849 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); | |
850 | dev->mtu = ETH_DATA_LEN; | |
b96f9afe JW |
851 | dev->min_mtu = IPV6_MIN_MTU; |
852 | dev->max_mtu = IP_MAX_MTU; | |
ed1efb2a SK |
853 | dev->flags |= IFF_NOARP; |
854 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 855 | netif_keep_dst(dev); |
45ce0fd1 FJ |
856 | /* This perm addr will be used as interface identifier by IPv6 */ |
857 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
858 | eth_random_addr(dev->perm_addr); | |
ed1efb2a SK |
859 | } |
860 | ||
861 | /** | |
862 | * vti6_dev_init_gen - general initializer for all tunnel devices | |
863 | * @dev: virtual device associated with tunnel | |
864 | **/ | |
865 | static inline int vti6_dev_init_gen(struct net_device *dev) | |
866 | { | |
867 | struct ip6_tnl *t = netdev_priv(dev); | |
868 | ||
869 | t->dev = dev; | |
870 | t->net = dev_net(dev); | |
1c213bd2 | 871 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
ed1efb2a SK |
872 | if (!dev->tstats) |
873 | return -ENOMEM; | |
874 | return 0; | |
875 | } | |
876 | ||
877 | /** | |
878 | * vti6_dev_init - initializer for all non fallback tunnel devices | |
879 | * @dev: virtual device associated with tunnel | |
880 | **/ | |
881 | static int vti6_dev_init(struct net_device *dev) | |
882 | { | |
883 | struct ip6_tnl *t = netdev_priv(dev); | |
884 | int err = vti6_dev_init_gen(dev); | |
885 | ||
886 | if (err) | |
887 | return err; | |
888 | vti6_link_config(t); | |
889 | return 0; | |
890 | } | |
891 | ||
892 | /** | |
893 | * vti6_fb_tnl_dev_init - initializer for fallback tunnel device | |
894 | * @dev: fallback device | |
895 | * | |
896 | * Return: 0 | |
897 | **/ | |
898 | static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) | |
899 | { | |
900 | struct ip6_tnl *t = netdev_priv(dev); | |
901 | struct net *net = dev_net(dev); | |
902 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
ed1efb2a SK |
903 | |
904 | t->parms.proto = IPPROTO_IPV6; | |
905 | dev_hold(dev); | |
906 | ||
ed1efb2a SK |
907 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
908 | return 0; | |
909 | } | |
910 | ||
a8b8a889 MS |
911 | static int vti6_validate(struct nlattr *tb[], struct nlattr *data[], |
912 | struct netlink_ext_ack *extack) | |
ed1efb2a SK |
913 | { |
914 | return 0; | |
915 | } | |
916 | ||
917 | static void vti6_netlink_parms(struct nlattr *data[], | |
918 | struct __ip6_tnl_parm *parms) | |
919 | { | |
920 | memset(parms, 0, sizeof(*parms)); | |
921 | ||
922 | if (!data) | |
923 | return; | |
924 | ||
925 | if (data[IFLA_VTI_LINK]) | |
926 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
927 | ||
928 | if (data[IFLA_VTI_LOCAL]) | |
67b61f6c | 929 | parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]); |
ed1efb2a SK |
930 | |
931 | if (data[IFLA_VTI_REMOTE]) | |
67b61f6c | 932 | parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]); |
ed1efb2a SK |
933 | |
934 | if (data[IFLA_VTI_IKEY]) | |
935 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
936 | ||
937 | if (data[IFLA_VTI_OKEY]) | |
938 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
0a473b82 CG |
939 | |
940 | if (data[IFLA_VTI_FWMARK]) | |
941 | parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); | |
ed1efb2a SK |
942 | } |
943 | ||
944 | static int vti6_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
945 | struct nlattr *tb[], struct nlattr *data[], |
946 | struct netlink_ext_ack *extack) | |
ed1efb2a SK |
947 | { |
948 | struct net *net = dev_net(dev); | |
949 | struct ip6_tnl *nt; | |
950 | ||
951 | nt = netdev_priv(dev); | |
952 | vti6_netlink_parms(data, &nt->parms); | |
953 | ||
954 | nt->parms.proto = IPPROTO_IPV6; | |
955 | ||
956 | if (vti6_locate(net, &nt->parms, 0)) | |
957 | return -EEXIST; | |
958 | ||
959 | return vti6_tnl_create2(dev); | |
960 | } | |
961 | ||
20ea60ca | 962 | static void vti6_dellink(struct net_device *dev, struct list_head *head) |
963 | { | |
964 | struct net *net = dev_net(dev); | |
965 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
966 | ||
967 | if (dev != ip6n->fb_tnl_dev) | |
968 | unregister_netdevice_queue(dev, head); | |
969 | } | |
970 | ||
ed1efb2a | 971 | static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], |
ad744b22 MS |
972 | struct nlattr *data[], |
973 | struct netlink_ext_ack *extack) | |
ed1efb2a SK |
974 | { |
975 | struct ip6_tnl *t; | |
976 | struct __ip6_tnl_parm p; | |
977 | struct net *net = dev_net(dev); | |
978 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
979 | ||
980 | if (dev == ip6n->fb_tnl_dev) | |
981 | return -EINVAL; | |
982 | ||
983 | vti6_netlink_parms(data, &p); | |
984 | ||
985 | t = vti6_locate(net, &p, 0); | |
986 | ||
987 | if (t) { | |
988 | if (t->dev != dev) | |
989 | return -EEXIST; | |
990 | } else | |
991 | t = netdev_priv(dev); | |
992 | ||
993 | return vti6_update(t, &p); | |
994 | } | |
995 | ||
996 | static size_t vti6_get_size(const struct net_device *dev) | |
997 | { | |
998 | return | |
999 | /* IFLA_VTI_LINK */ | |
1000 | nla_total_size(4) + | |
1001 | /* IFLA_VTI_LOCAL */ | |
1002 | nla_total_size(sizeof(struct in6_addr)) + | |
1003 | /* IFLA_VTI_REMOTE */ | |
1004 | nla_total_size(sizeof(struct in6_addr)) + | |
1005 | /* IFLA_VTI_IKEY */ | |
1006 | nla_total_size(4) + | |
1007 | /* IFLA_VTI_OKEY */ | |
1008 | nla_total_size(4) + | |
0a473b82 CG |
1009 | /* IFLA_VTI_FWMARK */ |
1010 | nla_total_size(4) + | |
ed1efb2a SK |
1011 | 0; |
1012 | } | |
1013 | ||
1014 | static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1015 | { | |
1016 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1017 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1018 | ||
1019 | if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || | |
930345ea JB |
1020 | nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || |
1021 | nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || | |
ed1efb2a | 1022 | nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || |
0a473b82 CG |
1023 | nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) || |
1024 | nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark)) | |
ed1efb2a SK |
1025 | goto nla_put_failure; |
1026 | return 0; | |
1027 | ||
1028 | nla_put_failure: | |
1029 | return -EMSGSIZE; | |
1030 | } | |
1031 | ||
1032 | static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { | |
1033 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
1034 | [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1035 | [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1036 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
1037 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
0a473b82 | 1038 | [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, |
ed1efb2a SK |
1039 | }; |
1040 | ||
1041 | static struct rtnl_link_ops vti6_link_ops __read_mostly = { | |
1042 | .kind = "vti6", | |
1043 | .maxtype = IFLA_VTI_MAX, | |
1044 | .policy = vti6_policy, | |
1045 | .priv_size = sizeof(struct ip6_tnl), | |
1046 | .setup = vti6_dev_setup, | |
1047 | .validate = vti6_validate, | |
1048 | .newlink = vti6_newlink, | |
20ea60ca | 1049 | .dellink = vti6_dellink, |
ed1efb2a SK |
1050 | .changelink = vti6_changelink, |
1051 | .get_size = vti6_get_size, | |
1052 | .fill_info = vti6_fill_info, | |
1728d4fa | 1053 | .get_link_net = ip6_tnl_get_link_net, |
ed1efb2a SK |
1054 | }; |
1055 | ||
bb401cae ED |
1056 | static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n, |
1057 | struct list_head *list) | |
ed1efb2a SK |
1058 | { |
1059 | int h; | |
1060 | struct ip6_tnl *t; | |
ed1efb2a | 1061 | |
e87a8f24 | 1062 | for (h = 0; h < IP6_VTI_HASH_SIZE; h++) { |
ed1efb2a | 1063 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 1064 | while (t) { |
bb401cae | 1065 | unregister_netdevice_queue(t->dev, list); |
ed1efb2a SK |
1066 | t = rtnl_dereference(t->next); |
1067 | } | |
1068 | } | |
1069 | ||
1070 | t = rtnl_dereference(ip6n->tnls_wc[0]); | |
bb401cae | 1071 | unregister_netdevice_queue(t->dev, list); |
ed1efb2a SK |
1072 | } |
1073 | ||
1074 | static int __net_init vti6_init_net(struct net *net) | |
1075 | { | |
1076 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1077 | struct ip6_tnl *t = NULL; | |
1078 | int err; | |
1079 | ||
1080 | ip6n->tnls[0] = ip6n->tnls_wc; | |
1081 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1082 | ||
1083 | err = -ENOMEM; | |
1084 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", | |
c835a677 | 1085 | NET_NAME_UNKNOWN, vti6_dev_setup); |
ed1efb2a SK |
1086 | |
1087 | if (!ip6n->fb_tnl_dev) | |
1088 | goto err_alloc_dev; | |
1089 | dev_net_set(ip6n->fb_tnl_dev, net); | |
20ea60ca | 1090 | ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
ed1efb2a SK |
1091 | |
1092 | err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); | |
1093 | if (err < 0) | |
1094 | goto err_register; | |
1095 | ||
1096 | err = register_netdev(ip6n->fb_tnl_dev); | |
1097 | if (err < 0) | |
1098 | goto err_register; | |
1099 | ||
1100 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1101 | ||
1102 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
1103 | return 0; | |
1104 | ||
1105 | err_register: | |
cf124db5 | 1106 | free_netdev(ip6n->fb_tnl_dev); |
ed1efb2a SK |
1107 | err_alloc_dev: |
1108 | return err; | |
1109 | } | |
1110 | ||
bb401cae | 1111 | static void __net_exit vti6_exit_batch_net(struct list_head *net_list) |
ed1efb2a | 1112 | { |
bb401cae ED |
1113 | struct vti6_net *ip6n; |
1114 | struct net *net; | |
1115 | LIST_HEAD(list); | |
ed1efb2a SK |
1116 | |
1117 | rtnl_lock(); | |
bb401cae ED |
1118 | list_for_each_entry(net, net_list, exit_list) { |
1119 | ip6n = net_generic(net, vti6_net_id); | |
1120 | vti6_destroy_tunnels(ip6n, &list); | |
1121 | } | |
1122 | unregister_netdevice_many(&list); | |
ed1efb2a SK |
1123 | rtnl_unlock(); |
1124 | } | |
1125 | ||
1126 | static struct pernet_operations vti6_net_ops = { | |
1127 | .init = vti6_init_net, | |
bb401cae | 1128 | .exit_batch = vti6_exit_batch_net, |
ed1efb2a SK |
1129 | .id = &vti6_net_id, |
1130 | .size = sizeof(struct vti6_net), | |
1131 | }; | |
1132 | ||
fa9ad96d SK |
1133 | static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
1134 | .handler = vti6_rcv, | |
1135 | .cb_handler = vti6_rcv_cb, | |
1136 | .err_handler = vti6_err, | |
1137 | .priority = 100, | |
1138 | }; | |
1139 | ||
1140 | static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { | |
1141 | .handler = vti6_rcv, | |
1142 | .cb_handler = vti6_rcv_cb, | |
1143 | .err_handler = vti6_err, | |
1144 | .priority = 100, | |
1145 | }; | |
1146 | ||
1147 | static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { | |
1148 | .handler = vti6_rcv, | |
1149 | .cb_handler = vti6_rcv_cb, | |
1150 | .err_handler = vti6_err, | |
1151 | .priority = 100, | |
1152 | }; | |
1153 | ||
ed1efb2a SK |
1154 | /** |
1155 | * vti6_tunnel_init - register protocol and reserve needed resources | |
1156 | * | |
1157 | * Return: 0 on success | |
1158 | **/ | |
1159 | static int __init vti6_tunnel_init(void) | |
1160 | { | |
e59d82fd MK |
1161 | const char *msg; |
1162 | int err; | |
ed1efb2a | 1163 | |
e59d82fd | 1164 | msg = "tunnel device"; |
ed1efb2a SK |
1165 | err = register_pernet_device(&vti6_net_ops); |
1166 | if (err < 0) | |
e59d82fd | 1167 | goto pernet_dev_failed; |
ed1efb2a | 1168 | |
e59d82fd | 1169 | msg = "tunnel protocols"; |
fa9ad96d | 1170 | err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd MK |
1171 | if (err < 0) |
1172 | goto xfrm_proto_esp_failed; | |
fa9ad96d | 1173 | err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd MK |
1174 | if (err < 0) |
1175 | goto xfrm_proto_ah_failed; | |
fa9ad96d | 1176 | err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd MK |
1177 | if (err < 0) |
1178 | goto xfrm_proto_comp_failed; | |
fa9ad96d | 1179 | |
e59d82fd | 1180 | msg = "netlink interface"; |
ed1efb2a SK |
1181 | err = rtnl_link_register(&vti6_link_ops); |
1182 | if (err < 0) | |
1183 | goto rtnl_link_failed; | |
1184 | ||
1185 | return 0; | |
1186 | ||
1187 | rtnl_link_failed: | |
fa9ad96d | 1188 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd | 1189 | xfrm_proto_comp_failed: |
fa9ad96d | 1190 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd | 1191 | xfrm_proto_ah_failed: |
fa9ad96d | 1192 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd | 1193 | xfrm_proto_esp_failed: |
ed1efb2a | 1194 | unregister_pernet_device(&vti6_net_ops); |
e59d82fd MK |
1195 | pernet_dev_failed: |
1196 | pr_err("vti6 init: failed to register %s\n", msg); | |
ed1efb2a SK |
1197 | return err; |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * vti6_tunnel_cleanup - free resources and unregister protocol | |
1202 | **/ | |
1203 | static void __exit vti6_tunnel_cleanup(void) | |
1204 | { | |
1205 | rtnl_link_unregister(&vti6_link_ops); | |
e59d82fd MK |
1206 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
1207 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); | |
1208 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); | |
ed1efb2a SK |
1209 | unregister_pernet_device(&vti6_net_ops); |
1210 | } | |
1211 | ||
1212 | module_init(vti6_tunnel_init); | |
1213 | module_exit(vti6_tunnel_cleanup); | |
1214 | MODULE_LICENSE("GPL"); | |
1215 | MODULE_ALIAS_RTNL_LINK("vti6"); | |
1216 | MODULE_ALIAS_NETDEV("ip6_vti0"); | |
1217 | MODULE_AUTHOR("Steffen Klassert"); | |
1218 | MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); |