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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 | ||
537b361f ED |
215 | if (p->name[0]) { |
216 | if (!dev_valid_name(p->name)) | |
217 | goto failed; | |
ed1efb2a | 218 | strlcpy(name, p->name, IFNAMSIZ); |
537b361f | 219 | } else { |
ed1efb2a | 220 | sprintf(name, "ip6_vti%%d"); |
537b361f | 221 | } |
ed1efb2a | 222 | |
c835a677 | 223 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup); |
63159f29 | 224 | if (!dev) |
ed1efb2a SK |
225 | goto failed; |
226 | ||
227 | dev_net_set(dev, net); | |
228 | ||
229 | t = netdev_priv(dev); | |
230 | t->parms = *p; | |
231 | t->net = dev_net(dev); | |
232 | ||
233 | err = vti6_tnl_create2(dev); | |
234 | if (err < 0) | |
235 | goto failed_free; | |
236 | ||
237 | return t; | |
238 | ||
239 | failed_free: | |
cf124db5 | 240 | free_netdev(dev); |
ed1efb2a SK |
241 | failed: |
242 | return NULL; | |
243 | } | |
244 | ||
245 | /** | |
246 | * vti6_locate - find or create tunnel matching given parameters | |
247 | * @net: network namespace | |
248 | * @p: tunnel parameters | |
249 | * @create: != 0 if allowed to create new tunnel if no match found | |
250 | * | |
251 | * Description: | |
252 | * vti6_locate() first tries to locate an existing tunnel | |
253 | * based on @parms. If this is unsuccessful, but @create is set a new | |
254 | * tunnel device is created and registered for use. | |
255 | * | |
256 | * Return: | |
257 | * matching tunnel or NULL | |
258 | **/ | |
259 | static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p, | |
260 | int create) | |
261 | { | |
262 | const struct in6_addr *remote = &p->raddr; | |
263 | const struct in6_addr *local = &p->laddr; | |
264 | struct ip6_tnl __rcu **tp; | |
265 | struct ip6_tnl *t; | |
266 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
267 | ||
268 | for (tp = vti6_tnl_bucket(ip6n, p); | |
269 | (t = rtnl_dereference(*tp)) != NULL; | |
270 | tp = &t->next) { | |
271 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
d814b847 SK |
272 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
273 | if (create) | |
274 | return NULL; | |
275 | ||
ed1efb2a | 276 | return t; |
d814b847 | 277 | } |
ed1efb2a SK |
278 | } |
279 | if (!create) | |
280 | return NULL; | |
281 | return vti6_tnl_create(net, p); | |
282 | } | |
283 | ||
284 | /** | |
285 | * vti6_dev_uninit - tunnel device uninitializer | |
286 | * @dev: the device to be destroyed | |
287 | * | |
288 | * Description: | |
289 | * vti6_dev_uninit() removes tunnel from its list | |
290 | **/ | |
291 | static void vti6_dev_uninit(struct net_device *dev) | |
292 | { | |
293 | struct ip6_tnl *t = netdev_priv(dev); | |
092a29a4 | 294 | struct vti6_net *ip6n = net_generic(t->net, vti6_net_id); |
ed1efb2a SK |
295 | |
296 | if (dev == ip6n->fb_tnl_dev) | |
297 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); | |
298 | else | |
299 | vti6_tnl_unlink(ip6n, t); | |
ed1efb2a SK |
300 | dev_put(dev); |
301 | } | |
302 | ||
303 | static int vti6_rcv(struct sk_buff *skb) | |
304 | { | |
305 | struct ip6_tnl *t; | |
306 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
307 | ||
308 | rcu_read_lock(); | |
e5d08d71 | 309 | t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
53b24b8f | 310 | if (t) { |
ed1efb2a SK |
311 | if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { |
312 | rcu_read_unlock(); | |
313 | goto discard; | |
314 | } | |
315 | ||
316 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
317 | rcu_read_unlock(); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { | |
322 | t->dev->stats.rx_dropped++; | |
323 | rcu_read_unlock(); | |
324 | goto discard; | |
325 | } | |
326 | ||
ed1efb2a | 327 | rcu_read_unlock(); |
fa9ad96d | 328 | |
63c43787 | 329 | return xfrm6_rcv_tnl(skb, t); |
ed1efb2a SK |
330 | } |
331 | rcu_read_unlock(); | |
fa9ad96d | 332 | return -EINVAL; |
ed1efb2a SK |
333 | discard: |
334 | kfree_skb(skb); | |
335 | return 0; | |
336 | } | |
337 | ||
fa9ad96d SK |
338 | static int vti6_rcv_cb(struct sk_buff *skb, int err) |
339 | { | |
340 | unsigned short family; | |
341 | struct net_device *dev; | |
342 | struct pcpu_sw_netstats *tstats; | |
343 | struct xfrm_state *x; | |
1fb81e09 | 344 | struct xfrm_mode *inner_mode; |
fa9ad96d | 345 | struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; |
d55c670c AD |
346 | u32 orig_mark = skb->mark; |
347 | int ret; | |
fa9ad96d SK |
348 | |
349 | if (!t) | |
350 | return 1; | |
351 | ||
352 | dev = t->dev; | |
353 | ||
354 | if (err) { | |
355 | dev->stats.rx_errors++; | |
356 | dev->stats.rx_dropped++; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | x = xfrm_input_state(skb); | |
1fb81e09 | 362 | |
363 | inner_mode = x->inner_mode; | |
364 | ||
365 | if (x->sel.family == AF_UNSPEC) { | |
366 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
367 | if (inner_mode == NULL) { | |
368 | XFRM_INC_STATS(dev_net(skb->dev), | |
369 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
370 | return -EINVAL; | |
371 | } | |
372 | } | |
373 | ||
374 | family = inner_mode->afinfo->family; | |
fa9ad96d | 375 | |
d55c670c AD |
376 | skb->mark = be32_to_cpu(t->parms.i_key); |
377 | ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); | |
378 | skb->mark = orig_mark; | |
379 | ||
380 | if (!ret) | |
fa9ad96d SK |
381 | return -EPERM; |
382 | ||
383 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); | |
384 | skb->dev = dev; | |
385 | ||
386 | tstats = this_cpu_ptr(dev->tstats); | |
387 | u64_stats_update_begin(&tstats->syncp); | |
388 | tstats->rx_packets++; | |
389 | tstats->rx_bytes += skb->len; | |
390 | u64_stats_update_end(&tstats->syncp); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
ed1efb2a SK |
395 | /** |
396 | * vti6_addr_conflict - compare packet addresses to tunnel's own | |
397 | * @t: the outgoing tunnel device | |
398 | * @hdr: IPv6 header from the incoming packet | |
399 | * | |
400 | * Description: | |
401 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
402 | * doesn't match source of incoming packet. | |
403 | * | |
404 | * Return: | |
405 | * 1 if conflict, | |
406 | * 0 else | |
407 | **/ | |
408 | static inline bool | |
409 | vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) | |
410 | { | |
411 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
412 | } | |
413 | ||
26be8e2d SK |
414 | static bool vti6_state_check(const struct xfrm_state *x, |
415 | const struct in6_addr *dst, | |
416 | const struct in6_addr *src) | |
417 | { | |
418 | xfrm_address_t *daddr = (xfrm_address_t *)dst; | |
419 | xfrm_address_t *saddr = (xfrm_address_t *)src; | |
420 | ||
421 | /* if there is no transform then this tunnel is not functional. | |
422 | * Or if the xfrm is not mode tunnel. | |
423 | */ | |
424 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
425 | x->props.family != AF_INET6) | |
426 | return false; | |
427 | ||
428 | if (ipv6_addr_any(dst)) | |
429 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); | |
430 | ||
431 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) | |
432 | return false; | |
433 | ||
434 | return true; | |
435 | } | |
436 | ||
ed1efb2a SK |
437 | /** |
438 | * vti6_xmit - send a packet | |
439 | * @skb: the outgoing socket buffer | |
440 | * @dev: the outgoing tunnel device | |
22e1b23d | 441 | * @fl: the flow informations for the xfrm_lookup |
ed1efb2a | 442 | **/ |
22e1b23d SK |
443 | static int |
444 | vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
ed1efb2a | 445 | { |
ed1efb2a SK |
446 | struct ip6_tnl *t = netdev_priv(dev); |
447 | struct net_device_stats *stats = &t->dev->stats; | |
7c852581 | 448 | struct dst_entry *dst = skb_dst(skb); |
ed1efb2a | 449 | struct net_device *tdev; |
d5005140 | 450 | struct xfrm_state *x; |
36f6ee22 | 451 | int pkt_len = skb->len; |
ed1efb2a | 452 | int err = -1; |
ccd740cb | 453 | int mtu; |
ed1efb2a | 454 | |
7c852581 SK |
455 | if (!dst) |
456 | goto tx_err_link_failure; | |
ed1efb2a | 457 | |
7c852581 | 458 | dst_hold(dst); |
22e1b23d | 459 | dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
7c852581 SK |
460 | if (IS_ERR(dst)) { |
461 | err = PTR_ERR(dst); | |
462 | dst = NULL; | |
463 | goto tx_err_link_failure; | |
ed1efb2a SK |
464 | } |
465 | ||
d5005140 SK |
466 | x = dst->xfrm; |
467 | if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) | |
468 | goto tx_err_link_failure; | |
469 | ||
470 | if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, | |
471 | (const struct in6_addr *)&x->id.daddr)) | |
ed1efb2a SK |
472 | goto tx_err_link_failure; |
473 | ||
474 | tdev = dst->dev; | |
475 | ||
476 | if (tdev == dev) { | |
477 | stats->collisions++; | |
478 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
479 | t->parms.name); | |
480 | goto tx_err_dst_release; | |
481 | } | |
482 | ||
7c852581 SK |
483 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
484 | skb_dst_set(skb, dst); | |
485 | skb->dev = skb_dst(skb)->dev; | |
ed1efb2a | 486 | |
ccd740cb SK |
487 | mtu = dst_mtu(dst); |
488 | if (!skb->ignore_df && skb->len > mtu) { | |
f15ca723 | 489 | skb_dst_update_pmtu(skb, mtu); |
ccd740cb | 490 | |
e3dc847a SK |
491 | if (skb->protocol == htons(ETH_P_IPV6)) { |
492 | if (mtu < IPV6_MIN_MTU) | |
493 | mtu = IPV6_MIN_MTU; | |
494 | ||
ccd740cb | 495 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
e3dc847a | 496 | } else { |
ccd740cb SK |
497 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
498 | htonl(mtu)); | |
e3dc847a | 499 | } |
ccd740cb SK |
500 | |
501 | return -EMSGSIZE; | |
502 | } | |
503 | ||
13206b6b | 504 | err = dst_output(t->net, skb->sk, skb); |
22e1b23d SK |
505 | if (net_xmit_eval(err) == 0) { |
506 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
507 | ||
508 | u64_stats_update_begin(&tstats->syncp); | |
36f6ee22 | 509 | tstats->tx_bytes += pkt_len; |
22e1b23d SK |
510 | tstats->tx_packets++; |
511 | u64_stats_update_end(&tstats->syncp); | |
512 | } else { | |
513 | stats->tx_errors++; | |
514 | stats->tx_aborted_errors++; | |
515 | } | |
ed1efb2a SK |
516 | |
517 | return 0; | |
518 | tx_err_link_failure: | |
519 | stats->tx_carrier_errors++; | |
520 | dst_link_failure(skb); | |
521 | tx_err_dst_release: | |
7c852581 | 522 | dst_release(dst); |
ed1efb2a SK |
523 | return err; |
524 | } | |
525 | ||
526 | static netdev_tx_t | |
527 | vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
528 | { | |
529 | struct ip6_tnl *t = netdev_priv(dev); | |
530 | struct net_device_stats *stats = &t->dev->stats; | |
22e1b23d SK |
531 | struct ipv6hdr *ipv6h; |
532 | struct flowi fl; | |
ed1efb2a SK |
533 | int ret; |
534 | ||
22e1b23d | 535 | memset(&fl, 0, sizeof(fl)); |
22e1b23d | 536 | |
ed1efb2a SK |
537 | switch (skb->protocol) { |
538 | case htons(ETH_P_IPV6): | |
22e1b23d SK |
539 | ipv6h = ipv6_hdr(skb); |
540 | ||
541 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || | |
d5005140 | 542 | vti6_addr_conflict(t, ipv6h)) |
22e1b23d SK |
543 | goto tx_err; |
544 | ||
545 | xfrm_decode_session(skb, &fl, AF_INET6); | |
546 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
547 | break; | |
548 | case htons(ETH_P_IP): | |
549 | xfrm_decode_session(skb, &fl, AF_INET); | |
550 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
ed1efb2a SK |
551 | break; |
552 | default: | |
553 | goto tx_err; | |
554 | } | |
555 | ||
cd5279c1 AD |
556 | /* override mark with tunnel output key */ |
557 | fl.flowi_mark = be32_to_cpu(t->parms.o_key); | |
558 | ||
22e1b23d | 559 | ret = vti6_xmit(skb, dev, &fl); |
ed1efb2a SK |
560 | if (ret < 0) |
561 | goto tx_err; | |
562 | ||
563 | return NETDEV_TX_OK; | |
564 | ||
565 | tx_err: | |
566 | stats->tx_errors++; | |
567 | stats->tx_dropped++; | |
568 | kfree_skb(skb); | |
569 | return NETDEV_TX_OK; | |
570 | } | |
571 | ||
fa9ad96d SK |
572 | static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
573 | u8 type, u8 code, int offset, __be32 info) | |
574 | { | |
575 | __be32 spi; | |
6d004d6c | 576 | __u32 mark; |
fa9ad96d SK |
577 | struct xfrm_state *x; |
578 | struct ip6_tnl *t; | |
579 | struct ip_esp_hdr *esph; | |
580 | struct ip_auth_hdr *ah; | |
581 | struct ip_comp_hdr *ipch; | |
582 | struct net *net = dev_net(skb->dev); | |
583 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
584 | int protocol = iph->nexthdr; | |
585 | ||
586 | t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); | |
587 | if (!t) | |
588 | return -1; | |
589 | ||
6d004d6c SK |
590 | mark = be32_to_cpu(t->parms.o_key); |
591 | ||
fa9ad96d SK |
592 | switch (protocol) { |
593 | case IPPROTO_ESP: | |
594 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
595 | spi = esph->spi; | |
596 | break; | |
597 | case IPPROTO_AH: | |
598 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
599 | spi = ah->spi; | |
600 | break; | |
601 | case IPPROTO_COMP: | |
602 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
603 | spi = htonl(ntohs(ipch->cpi)); | |
604 | break; | |
605 | default: | |
606 | return 0; | |
607 | } | |
608 | ||
609 | if (type != ICMPV6_PKT_TOOBIG && | |
610 | type != NDISC_REDIRECT) | |
611 | return 0; | |
612 | ||
6d004d6c | 613 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
fa9ad96d SK |
614 | spi, protocol, AF_INET6); |
615 | if (!x) | |
616 | return 0; | |
617 | ||
618 | if (type == NDISC_REDIRECT) | |
e2d118a1 LC |
619 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
620 | sock_net_uid(net, NULL)); | |
fa9ad96d | 621 | else |
e2d118a1 | 622 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
fa9ad96d SK |
623 | xfrm_state_put(x); |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
7a67e69a | 628 | static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu) |
ed1efb2a | 629 | { |
ed1efb2a SK |
630 | struct net_device *dev = t->dev; |
631 | struct __ip6_tnl_parm *p = &t->parms; | |
53c81e95 | 632 | struct net_device *tdev = NULL; |
c6741fbe | 633 | int mtu; |
ed1efb2a SK |
634 | |
635 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
636 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
637 | ||
ed1efb2a SK |
638 | p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
639 | IP6_TNL_F_CAP_PER_PACKET); | |
640 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
641 | ||
642 | if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) | |
643 | dev->flags |= IFF_POINTOPOINT; | |
644 | else | |
645 | dev->flags &= ~IFF_POINTOPOINT; | |
53c81e95 | 646 | |
7a67e69a SB |
647 | if (keep_mtu && dev->mtu) { |
648 | dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu); | |
649 | return; | |
650 | } | |
651 | ||
53c81e95 AK |
652 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
653 | int strict = (ipv6_addr_type(&p->raddr) & | |
654 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
655 | struct rt6_info *rt = rt6_lookup(t->net, | |
656 | &p->raddr, &p->laddr, | |
b75cc8f9 | 657 | p->link, NULL, strict); |
53c81e95 AK |
658 | |
659 | if (rt) | |
660 | tdev = rt->dst.dev; | |
661 | ip6_rt_put(rt); | |
662 | } | |
663 | ||
664 | if (!tdev && p->link) | |
665 | tdev = __dev_get_by_index(t->net, p->link); | |
666 | ||
667 | if (tdev) | |
c6741fbe SB |
668 | mtu = tdev->mtu - sizeof(struct ipv6hdr); |
669 | else | |
670 | mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr); | |
671 | ||
672 | dev->mtu = max_t(int, mtu, IPV6_MIN_MTU); | |
ed1efb2a SK |
673 | } |
674 | ||
675 | /** | |
676 | * vti6_tnl_change - update the tunnel parameters | |
677 | * @t: tunnel to be changed | |
678 | * @p: tunnel configuration parameters | |
7a67e69a | 679 | * @keep_mtu: MTU was set from userspace, don't re-compute it |
ed1efb2a SK |
680 | * |
681 | * Description: | |
682 | * vti6_tnl_change() updates the tunnel parameters | |
683 | **/ | |
684 | static int | |
7a67e69a SB |
685 | vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, |
686 | bool keep_mtu) | |
ed1efb2a SK |
687 | { |
688 | t->parms.laddr = p->laddr; | |
689 | t->parms.raddr = p->raddr; | |
690 | t->parms.link = p->link; | |
691 | t->parms.i_key = p->i_key; | |
692 | t->parms.o_key = p->o_key; | |
693 | t->parms.proto = p->proto; | |
0a473b82 | 694 | t->parms.fwmark = p->fwmark; |
607f725f | 695 | dst_cache_reset(&t->dst_cache); |
7a67e69a | 696 | vti6_link_config(t, keep_mtu); |
ed1efb2a SK |
697 | return 0; |
698 | } | |
699 | ||
7a67e69a SB |
700 | static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p, |
701 | bool keep_mtu) | |
ed1efb2a SK |
702 | { |
703 | struct net *net = dev_net(t->dev); | |
704 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
705 | int err; | |
706 | ||
707 | vti6_tnl_unlink(ip6n, t); | |
708 | synchronize_net(); | |
7a67e69a | 709 | err = vti6_tnl_change(t, p, keep_mtu); |
ed1efb2a SK |
710 | vti6_tnl_link(ip6n, t); |
711 | netdev_state_change(t->dev); | |
712 | return err; | |
713 | } | |
714 | ||
715 | static void | |
716 | vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) | |
717 | { | |
718 | p->laddr = u->laddr; | |
719 | p->raddr = u->raddr; | |
720 | p->link = u->link; | |
721 | p->i_key = u->i_key; | |
722 | p->o_key = u->o_key; | |
723 | p->proto = u->proto; | |
724 | ||
725 | memcpy(p->name, u->name, sizeof(u->name)); | |
726 | } | |
727 | ||
728 | static void | |
729 | vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) | |
730 | { | |
731 | u->laddr = p->laddr; | |
732 | u->raddr = p->raddr; | |
733 | u->link = p->link; | |
734 | u->i_key = p->i_key; | |
735 | u->o_key = p->o_key; | |
7dcdf941 DF |
736 | if (u->i_key) |
737 | u->i_flags |= GRE_KEY; | |
738 | if (u->o_key) | |
739 | u->o_flags |= GRE_KEY; | |
ed1efb2a SK |
740 | u->proto = p->proto; |
741 | ||
742 | memcpy(u->name, p->name, sizeof(u->name)); | |
743 | } | |
744 | ||
745 | /** | |
746 | * vti6_tnl_ioctl - configure vti6 tunnels from userspace | |
747 | * @dev: virtual device associated with tunnel | |
748 | * @ifr: parameters passed from userspace | |
749 | * @cmd: command to be performed | |
750 | * | |
751 | * Description: | |
752 | * vti6_ioctl() is used for managing vti6 tunnels | |
753 | * from userspace. | |
754 | * | |
755 | * The possible commands are the following: | |
756 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
757 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
758 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
759 | * %SIOCDELTUNNEL: delete tunnel | |
760 | * | |
761 | * The fallback device "ip6_vti0", created during module | |
762 | * initialization, can be used for creating other tunnel devices. | |
763 | * | |
764 | * Return: | |
765 | * 0 on success, | |
766 | * %-EFAULT if unable to copy data to or from userspace, | |
767 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
768 | * %-EINVAL if passed tunnel parameters are invalid, | |
769 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
770 | * %-ENODEV if attempting to change or delete a nonexisting device | |
771 | **/ | |
772 | static int | |
773 | vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
774 | { | |
775 | int err = 0; | |
776 | struct ip6_tnl_parm2 p; | |
777 | struct __ip6_tnl_parm p1; | |
778 | struct ip6_tnl *t = NULL; | |
779 | struct net *net = dev_net(dev); | |
780 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
781 | ||
782 | switch (cmd) { | |
783 | case SIOCGETTUNNEL: | |
784 | if (dev == ip6n->fb_tnl_dev) { | |
785 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
786 | err = -EFAULT; | |
787 | break; | |
788 | } | |
789 | vti6_parm_from_user(&p1, &p); | |
790 | t = vti6_locate(net, &p1, 0); | |
791 | } else { | |
792 | memset(&p, 0, sizeof(p)); | |
793 | } | |
63159f29 | 794 | if (!t) |
ed1efb2a SK |
795 | t = netdev_priv(dev); |
796 | vti6_parm_to_user(&p, &t->parms); | |
797 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
798 | err = -EFAULT; | |
799 | break; | |
800 | case SIOCADDTUNNEL: | |
801 | case SIOCCHGTUNNEL: | |
802 | err = -EPERM; | |
803 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
804 | break; | |
805 | err = -EFAULT; | |
806 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
807 | break; | |
808 | err = -EINVAL; | |
809 | if (p.proto != IPPROTO_IPV6 && p.proto != 0) | |
810 | break; | |
811 | vti6_parm_from_user(&p1, &p); | |
812 | t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
813 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
53b24b8f | 814 | if (t) { |
ed1efb2a SK |
815 | if (t->dev != dev) { |
816 | err = -EEXIST; | |
817 | break; | |
818 | } | |
819 | } else | |
820 | t = netdev_priv(dev); | |
821 | ||
7a67e69a | 822 | err = vti6_update(t, &p1, false); |
ed1efb2a SK |
823 | } |
824 | if (t) { | |
825 | err = 0; | |
826 | vti6_parm_to_user(&p, &t->parms); | |
827 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
828 | err = -EFAULT; | |
829 | ||
830 | } else | |
831 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
832 | break; | |
833 | case SIOCDELTUNNEL: | |
834 | err = -EPERM; | |
835 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
836 | break; | |
837 | ||
838 | if (dev == ip6n->fb_tnl_dev) { | |
839 | err = -EFAULT; | |
840 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
841 | break; | |
842 | err = -ENOENT; | |
843 | vti6_parm_from_user(&p1, &p); | |
844 | t = vti6_locate(net, &p1, 0); | |
63159f29 | 845 | if (!t) |
ed1efb2a SK |
846 | break; |
847 | err = -EPERM; | |
848 | if (t->dev == ip6n->fb_tnl_dev) | |
849 | break; | |
850 | dev = t->dev; | |
851 | } | |
852 | err = 0; | |
853 | unregister_netdevice(dev); | |
854 | break; | |
855 | default: | |
856 | err = -EINVAL; | |
857 | } | |
858 | return err; | |
859 | } | |
860 | ||
ed1efb2a | 861 | static const struct net_device_ops vti6_netdev_ops = { |
16a0231b | 862 | .ndo_init = vti6_dev_init, |
ed1efb2a SK |
863 | .ndo_uninit = vti6_dev_uninit, |
864 | .ndo_start_xmit = vti6_tnl_xmit, | |
865 | .ndo_do_ioctl = vti6_ioctl, | |
469bdcef | 866 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 867 | .ndo_get_iflink = ip6_tnl_get_iflink, |
ed1efb2a SK |
868 | }; |
869 | ||
870 | /** | |
871 | * vti6_dev_setup - setup virtual tunnel device | |
872 | * @dev: virtual device associated with tunnel | |
873 | * | |
874 | * Description: | |
875 | * Initialize function pointers and device parameters | |
876 | **/ | |
877 | static void vti6_dev_setup(struct net_device *dev) | |
878 | { | |
ed1efb2a | 879 | dev->netdev_ops = &vti6_netdev_ops; |
cf124db5 DM |
880 | dev->needs_free_netdev = true; |
881 | dev->priv_destructor = vti6_dev_free; | |
ed1efb2a SK |
882 | |
883 | dev->type = ARPHRD_TUNNEL6; | |
b96f9afe | 884 | dev->min_mtu = IPV6_MIN_MTU; |
f8a554b4 | 885 | dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr); |
ed1efb2a SK |
886 | dev->flags |= IFF_NOARP; |
887 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 888 | netif_keep_dst(dev); |
45ce0fd1 FJ |
889 | /* This perm addr will be used as interface identifier by IPv6 */ |
890 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
891 | eth_random_addr(dev->perm_addr); | |
ed1efb2a SK |
892 | } |
893 | ||
894 | /** | |
895 | * vti6_dev_init_gen - general initializer for all tunnel devices | |
896 | * @dev: virtual device associated with tunnel | |
897 | **/ | |
898 | static inline int vti6_dev_init_gen(struct net_device *dev) | |
899 | { | |
900 | struct ip6_tnl *t = netdev_priv(dev); | |
901 | ||
902 | t->dev = dev; | |
903 | t->net = dev_net(dev); | |
1c213bd2 | 904 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
ed1efb2a SK |
905 | if (!dev->tstats) |
906 | return -ENOMEM; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | /** | |
911 | * vti6_dev_init - initializer for all non fallback tunnel devices | |
912 | * @dev: virtual device associated with tunnel | |
913 | **/ | |
914 | static int vti6_dev_init(struct net_device *dev) | |
915 | { | |
916 | struct ip6_tnl *t = netdev_priv(dev); | |
917 | int err = vti6_dev_init_gen(dev); | |
918 | ||
919 | if (err) | |
920 | return err; | |
7a67e69a | 921 | vti6_link_config(t, true); |
ed1efb2a SK |
922 | return 0; |
923 | } | |
924 | ||
925 | /** | |
926 | * vti6_fb_tnl_dev_init - initializer for fallback tunnel device | |
927 | * @dev: fallback device | |
928 | * | |
929 | * Return: 0 | |
930 | **/ | |
931 | static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) | |
932 | { | |
933 | struct ip6_tnl *t = netdev_priv(dev); | |
934 | struct net *net = dev_net(dev); | |
935 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
ed1efb2a SK |
936 | |
937 | t->parms.proto = IPPROTO_IPV6; | |
938 | dev_hold(dev); | |
939 | ||
ed1efb2a SK |
940 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
941 | return 0; | |
942 | } | |
943 | ||
a8b8a889 MS |
944 | static int vti6_validate(struct nlattr *tb[], struct nlattr *data[], |
945 | struct netlink_ext_ack *extack) | |
ed1efb2a SK |
946 | { |
947 | return 0; | |
948 | } | |
949 | ||
950 | static void vti6_netlink_parms(struct nlattr *data[], | |
951 | struct __ip6_tnl_parm *parms) | |
952 | { | |
953 | memset(parms, 0, sizeof(*parms)); | |
954 | ||
955 | if (!data) | |
956 | return; | |
957 | ||
958 | if (data[IFLA_VTI_LINK]) | |
959 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
960 | ||
961 | if (data[IFLA_VTI_LOCAL]) | |
67b61f6c | 962 | parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]); |
ed1efb2a SK |
963 | |
964 | if (data[IFLA_VTI_REMOTE]) | |
67b61f6c | 965 | parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]); |
ed1efb2a SK |
966 | |
967 | if (data[IFLA_VTI_IKEY]) | |
968 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
969 | ||
970 | if (data[IFLA_VTI_OKEY]) | |
971 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
0a473b82 CG |
972 | |
973 | if (data[IFLA_VTI_FWMARK]) | |
974 | parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); | |
ed1efb2a SK |
975 | } |
976 | ||
977 | static int vti6_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
978 | struct nlattr *tb[], struct nlattr *data[], |
979 | struct netlink_ext_ack *extack) | |
ed1efb2a SK |
980 | { |
981 | struct net *net = dev_net(dev); | |
982 | struct ip6_tnl *nt; | |
983 | ||
984 | nt = netdev_priv(dev); | |
985 | vti6_netlink_parms(data, &nt->parms); | |
986 | ||
987 | nt->parms.proto = IPPROTO_IPV6; | |
988 | ||
989 | if (vti6_locate(net, &nt->parms, 0)) | |
990 | return -EEXIST; | |
991 | ||
992 | return vti6_tnl_create2(dev); | |
993 | } | |
994 | ||
20ea60ca | 995 | static void vti6_dellink(struct net_device *dev, struct list_head *head) |
996 | { | |
997 | struct net *net = dev_net(dev); | |
998 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
999 | ||
1000 | if (dev != ip6n->fb_tnl_dev) | |
1001 | unregister_netdevice_queue(dev, head); | |
1002 | } | |
1003 | ||
ed1efb2a | 1004 | static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], |
ad744b22 MS |
1005 | struct nlattr *data[], |
1006 | struct netlink_ext_ack *extack) | |
ed1efb2a SK |
1007 | { |
1008 | struct ip6_tnl *t; | |
1009 | struct __ip6_tnl_parm p; | |
1010 | struct net *net = dev_net(dev); | |
1011 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1012 | ||
1013 | if (dev == ip6n->fb_tnl_dev) | |
1014 | return -EINVAL; | |
1015 | ||
1016 | vti6_netlink_parms(data, &p); | |
1017 | ||
1018 | t = vti6_locate(net, &p, 0); | |
1019 | ||
1020 | if (t) { | |
1021 | if (t->dev != dev) | |
1022 | return -EEXIST; | |
1023 | } else | |
1024 | t = netdev_priv(dev); | |
1025 | ||
7a67e69a | 1026 | return vti6_update(t, &p, tb && tb[IFLA_MTU]); |
ed1efb2a SK |
1027 | } |
1028 | ||
1029 | static size_t vti6_get_size(const struct net_device *dev) | |
1030 | { | |
1031 | return | |
1032 | /* IFLA_VTI_LINK */ | |
1033 | nla_total_size(4) + | |
1034 | /* IFLA_VTI_LOCAL */ | |
1035 | nla_total_size(sizeof(struct in6_addr)) + | |
1036 | /* IFLA_VTI_REMOTE */ | |
1037 | nla_total_size(sizeof(struct in6_addr)) + | |
1038 | /* IFLA_VTI_IKEY */ | |
1039 | nla_total_size(4) + | |
1040 | /* IFLA_VTI_OKEY */ | |
1041 | nla_total_size(4) + | |
0a473b82 CG |
1042 | /* IFLA_VTI_FWMARK */ |
1043 | nla_total_size(4) + | |
ed1efb2a SK |
1044 | 0; |
1045 | } | |
1046 | ||
1047 | static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1048 | { | |
1049 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1050 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1051 | ||
1052 | if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || | |
930345ea JB |
1053 | nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || |
1054 | nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || | |
ed1efb2a | 1055 | nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || |
0a473b82 CG |
1056 | nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) || |
1057 | nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark)) | |
ed1efb2a SK |
1058 | goto nla_put_failure; |
1059 | return 0; | |
1060 | ||
1061 | nla_put_failure: | |
1062 | return -EMSGSIZE; | |
1063 | } | |
1064 | ||
1065 | static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { | |
1066 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
1067 | [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1068 | [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1069 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
1070 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
0a473b82 | 1071 | [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, |
ed1efb2a SK |
1072 | }; |
1073 | ||
1074 | static struct rtnl_link_ops vti6_link_ops __read_mostly = { | |
1075 | .kind = "vti6", | |
1076 | .maxtype = IFLA_VTI_MAX, | |
1077 | .policy = vti6_policy, | |
1078 | .priv_size = sizeof(struct ip6_tnl), | |
1079 | .setup = vti6_dev_setup, | |
1080 | .validate = vti6_validate, | |
1081 | .newlink = vti6_newlink, | |
20ea60ca | 1082 | .dellink = vti6_dellink, |
ed1efb2a SK |
1083 | .changelink = vti6_changelink, |
1084 | .get_size = vti6_get_size, | |
1085 | .fill_info = vti6_fill_info, | |
1728d4fa | 1086 | .get_link_net = ip6_tnl_get_link_net, |
ed1efb2a SK |
1087 | }; |
1088 | ||
bb401cae ED |
1089 | static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n, |
1090 | struct list_head *list) | |
ed1efb2a SK |
1091 | { |
1092 | int h; | |
1093 | struct ip6_tnl *t; | |
ed1efb2a | 1094 | |
e87a8f24 | 1095 | for (h = 0; h < IP6_VTI_HASH_SIZE; h++) { |
ed1efb2a | 1096 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 1097 | while (t) { |
bb401cae | 1098 | unregister_netdevice_queue(t->dev, list); |
ed1efb2a SK |
1099 | t = rtnl_dereference(t->next); |
1100 | } | |
1101 | } | |
1102 | ||
1103 | t = rtnl_dereference(ip6n->tnls_wc[0]); | |
bb401cae | 1104 | unregister_netdevice_queue(t->dev, list); |
ed1efb2a SK |
1105 | } |
1106 | ||
1107 | static int __net_init vti6_init_net(struct net *net) | |
1108 | { | |
1109 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); | |
1110 | struct ip6_tnl *t = NULL; | |
1111 | int err; | |
1112 | ||
1113 | ip6n->tnls[0] = ip6n->tnls_wc; | |
1114 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1115 | ||
1116 | err = -ENOMEM; | |
1117 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", | |
c835a677 | 1118 | NET_NAME_UNKNOWN, vti6_dev_setup); |
ed1efb2a SK |
1119 | |
1120 | if (!ip6n->fb_tnl_dev) | |
1121 | goto err_alloc_dev; | |
1122 | dev_net_set(ip6n->fb_tnl_dev, net); | |
20ea60ca | 1123 | ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
ed1efb2a SK |
1124 | |
1125 | err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); | |
1126 | if (err < 0) | |
1127 | goto err_register; | |
1128 | ||
1129 | err = register_netdev(ip6n->fb_tnl_dev); | |
1130 | if (err < 0) | |
1131 | goto err_register; | |
1132 | ||
1133 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1134 | ||
1135 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
1136 | return 0; | |
1137 | ||
1138 | err_register: | |
cf124db5 | 1139 | free_netdev(ip6n->fb_tnl_dev); |
ed1efb2a SK |
1140 | err_alloc_dev: |
1141 | return err; | |
1142 | } | |
1143 | ||
bb401cae | 1144 | static void __net_exit vti6_exit_batch_net(struct list_head *net_list) |
ed1efb2a | 1145 | { |
bb401cae ED |
1146 | struct vti6_net *ip6n; |
1147 | struct net *net; | |
1148 | LIST_HEAD(list); | |
ed1efb2a SK |
1149 | |
1150 | rtnl_lock(); | |
bb401cae ED |
1151 | list_for_each_entry(net, net_list, exit_list) { |
1152 | ip6n = net_generic(net, vti6_net_id); | |
1153 | vti6_destroy_tunnels(ip6n, &list); | |
1154 | } | |
1155 | unregister_netdevice_many(&list); | |
ed1efb2a SK |
1156 | rtnl_unlock(); |
1157 | } | |
1158 | ||
1159 | static struct pernet_operations vti6_net_ops = { | |
1160 | .init = vti6_init_net, | |
bb401cae | 1161 | .exit_batch = vti6_exit_batch_net, |
ed1efb2a SK |
1162 | .id = &vti6_net_id, |
1163 | .size = sizeof(struct vti6_net), | |
1164 | }; | |
1165 | ||
fa9ad96d SK |
1166 | static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
1167 | .handler = vti6_rcv, | |
1168 | .cb_handler = vti6_rcv_cb, | |
1169 | .err_handler = vti6_err, | |
1170 | .priority = 100, | |
1171 | }; | |
1172 | ||
1173 | static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { | |
1174 | .handler = vti6_rcv, | |
1175 | .cb_handler = vti6_rcv_cb, | |
1176 | .err_handler = vti6_err, | |
1177 | .priority = 100, | |
1178 | }; | |
1179 | ||
1180 | static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { | |
1181 | .handler = vti6_rcv, | |
1182 | .cb_handler = vti6_rcv_cb, | |
1183 | .err_handler = vti6_err, | |
1184 | .priority = 100, | |
1185 | }; | |
1186 | ||
ed1efb2a SK |
1187 | /** |
1188 | * vti6_tunnel_init - register protocol and reserve needed resources | |
1189 | * | |
1190 | * Return: 0 on success | |
1191 | **/ | |
1192 | static int __init vti6_tunnel_init(void) | |
1193 | { | |
e59d82fd MK |
1194 | const char *msg; |
1195 | int err; | |
ed1efb2a | 1196 | |
e59d82fd | 1197 | msg = "tunnel device"; |
ed1efb2a SK |
1198 | err = register_pernet_device(&vti6_net_ops); |
1199 | if (err < 0) | |
e59d82fd | 1200 | goto pernet_dev_failed; |
ed1efb2a | 1201 | |
e59d82fd | 1202 | msg = "tunnel protocols"; |
fa9ad96d | 1203 | err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd MK |
1204 | if (err < 0) |
1205 | goto xfrm_proto_esp_failed; | |
fa9ad96d | 1206 | err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd MK |
1207 | if (err < 0) |
1208 | goto xfrm_proto_ah_failed; | |
fa9ad96d | 1209 | err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd MK |
1210 | if (err < 0) |
1211 | goto xfrm_proto_comp_failed; | |
fa9ad96d | 1212 | |
e59d82fd | 1213 | msg = "netlink interface"; |
ed1efb2a SK |
1214 | err = rtnl_link_register(&vti6_link_ops); |
1215 | if (err < 0) | |
1216 | goto rtnl_link_failed; | |
1217 | ||
1218 | return 0; | |
1219 | ||
1220 | rtnl_link_failed: | |
fa9ad96d | 1221 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
e59d82fd | 1222 | xfrm_proto_comp_failed: |
fa9ad96d | 1223 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
e59d82fd | 1224 | xfrm_proto_ah_failed: |
fa9ad96d | 1225 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
e59d82fd | 1226 | xfrm_proto_esp_failed: |
ed1efb2a | 1227 | unregister_pernet_device(&vti6_net_ops); |
e59d82fd MK |
1228 | pernet_dev_failed: |
1229 | pr_err("vti6 init: failed to register %s\n", msg); | |
ed1efb2a SK |
1230 | return err; |
1231 | } | |
1232 | ||
1233 | /** | |
1234 | * vti6_tunnel_cleanup - free resources and unregister protocol | |
1235 | **/ | |
1236 | static void __exit vti6_tunnel_cleanup(void) | |
1237 | { | |
1238 | rtnl_link_unregister(&vti6_link_ops); | |
e59d82fd MK |
1239 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
1240 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); | |
1241 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); | |
ed1efb2a SK |
1242 | unregister_pernet_device(&vti6_net_ops); |
1243 | } | |
1244 | ||
1245 | module_init(vti6_tunnel_init); | |
1246 | module_exit(vti6_tunnel_cleanup); | |
1247 | MODULE_LICENSE("GPL"); | |
1248 | MODULE_ALIAS_RTNL_LINK("vti6"); | |
1249 | MODULE_ALIAS_NETDEV("ip6_vti0"); | |
1250 | MODULE_AUTHOR("Steffen Klassert"); | |
1251 | MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); |