Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 | 8 | * |
1da177e4 | 9 | * Based on: |
c4d3efaf | 10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
11 | * |
12 | * RFC 2473 | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
f3213831 JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
1da177e4 LT |
32 | #include <linux/net.h> |
33 | #include <linux/in6.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/if_arp.h> | |
36 | #include <linux/icmpv6.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/route.h> | |
39 | #include <linux/rtnetlink.h> | |
40 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
ddbe5032 | 42 | #include <linux/hash.h> |
e837735e | 43 | #include <linux/etherdevice.h> |
1da177e4 | 44 | |
7c0f6ba6 | 45 | #include <linux/uaccess.h> |
60063497 | 46 | #include <linux/atomic.h> |
1da177e4 | 47 | |
c4d3efaf | 48 | #include <net/icmp.h> |
1da177e4 | 49 | #include <net/ip.h> |
c5441932 | 50 | #include <net/ip_tunnels.h> |
1da177e4 | 51 | #include <net/ipv6.h> |
1da177e4 LT |
52 | #include <net/ip6_route.h> |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_tunnel.h> | |
55 | #include <net/xfrm.h> | |
56 | #include <net/dsfield.h> | |
57 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
58 | #include <net/net_namespace.h> |
59 | #include <net/netns/generic.h> | |
8d79266b | 60 | #include <net/dst_metadata.h> |
1da177e4 LT |
61 | |
62 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 63 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 64 | MODULE_LICENSE("GPL"); |
f98f89a0 | 65 | MODULE_ALIAS_RTNL_LINK("ip6tnl"); |
6dfbd87a | 66 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 67 | |
e87a8f24 JK |
68 | #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 |
69 | #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) | |
1da177e4 | 70 | |
f4e0b4c5 ND |
71 | static bool log_ecn_error = true; |
72 | module_param(log_ecn_error, bool, 0644); | |
73 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
74 | ||
ddbe5032 ED |
75 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
76 | { | |
77 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
78 | ||
e87a8f24 | 79 | return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); |
ddbe5032 | 80 | } |
1da177e4 | 81 | |
8560f226 | 82 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 83 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 84 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 85 | |
c7d03a00 | 86 | static unsigned int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 87 | struct ip6_tnl_net { |
15820e12 PE |
88 | /* the IPv6 tunnel fallback device */ |
89 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 90 | /* lists for storing tunnels in use */ |
e87a8f24 | 91 | struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; |
94767632 ED |
92 | struct ip6_tnl __rcu *tnls_wc[1]; |
93 | struct ip6_tnl __rcu **tnls[2]; | |
8d79266b | 94 | struct ip6_tnl __rcu *collect_md_tun; |
13eeb8e9 PE |
95 | }; |
96 | ||
8560f226 ED |
97 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
98 | { | |
56a4342d | 99 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
8560f226 ED |
100 | int i; |
101 | ||
102 | for_each_possible_cpu(i) { | |
abb6013c | 103 | unsigned int start; |
8f84985f LR |
104 | const struct pcpu_sw_netstats *tstats = |
105 | per_cpu_ptr(dev->tstats, i); | |
8560f226 | 106 | |
abb6013c | 107 | do { |
57a7744e | 108 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
abb6013c LR |
109 | tmp.rx_packets = tstats->rx_packets; |
110 | tmp.rx_bytes = tstats->rx_bytes; | |
111 | tmp.tx_packets = tstats->tx_packets; | |
112 | tmp.tx_bytes = tstats->tx_bytes; | |
57a7744e | 113 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
abb6013c LR |
114 | |
115 | sum.rx_packets += tmp.rx_packets; | |
116 | sum.rx_bytes += tmp.rx_bytes; | |
117 | sum.tx_packets += tmp.tx_packets; | |
118 | sum.tx_bytes += tmp.tx_bytes; | |
8560f226 ED |
119 | } |
120 | dev->stats.rx_packets = sum.rx_packets; | |
121 | dev->stats.rx_bytes = sum.rx_bytes; | |
122 | dev->stats.tx_packets = sum.tx_packets; | |
123 | dev->stats.tx_bytes = sum.tx_bytes; | |
124 | return &dev->stats; | |
125 | } | |
126 | ||
1da177e4 | 127 | /** |
3144581c | 128 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
129 | * @remote: the address of the tunnel exit-point |
130 | * @local: the address of the tunnel entry-point | |
1da177e4 | 131 | * |
1ab1457c | 132 | * Return: |
1da177e4 | 133 | * tunnel matching given end-points if found, |
1ab1457c | 134 | * else fallback tunnel if its device is up, |
1da177e4 LT |
135 | * else %NULL |
136 | **/ | |
137 | ||
2922bc8a ED |
138 | #define for_each_ip6_tunnel_rcu(start) \ |
139 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
140 | ||
1da177e4 | 141 | static struct ip6_tnl * |
b71d1d42 | 142 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 143 | { |
ddbe5032 | 144 | unsigned int hash = HASH(remote, local); |
1da177e4 | 145 | struct ip6_tnl *t; |
3e6c9fb5 | 146 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
ea3dc960 | 147 | struct in6_addr any; |
1da177e4 | 148 | |
ddbe5032 | 149 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
150 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
151 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
152 | (t->dev->flags & IFF_UP)) | |
153 | return t; | |
154 | } | |
ea3dc960 SK |
155 | |
156 | memset(&any, 0, sizeof(any)); | |
157 | hash = HASH(&any, local); | |
158 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
159 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
68d00f33 | 160 | ipv6_addr_any(&t->parms.raddr) && |
ea3dc960 SK |
161 | (t->dev->flags & IFF_UP)) |
162 | return t; | |
163 | } | |
164 | ||
165 | hash = HASH(remote, &any); | |
166 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
167 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
68d00f33 | 168 | ipv6_addr_any(&t->parms.laddr) && |
ea3dc960 SK |
169 | (t->dev->flags & IFF_UP)) |
170 | return t; | |
171 | } | |
172 | ||
8d79266b AS |
173 | t = rcu_dereference(ip6n->collect_md_tun); |
174 | if (t) | |
175 | return t; | |
176 | ||
2922bc8a ED |
177 | t = rcu_dereference(ip6n->tnls_wc[0]); |
178 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
179 | return t; |
180 | ||
181 | return NULL; | |
182 | } | |
183 | ||
184 | /** | |
3144581c | 185 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 186 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
187 | * |
188 | * Description: | |
3144581c | 189 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
190 | * &struct in6_addr entries laddr and raddr in @p. |
191 | * | |
1ab1457c | 192 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
193 | **/ |
194 | ||
94767632 | 195 | static struct ip6_tnl __rcu ** |
c12b395a | 196 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 197 | { |
b71d1d42 ED |
198 | const struct in6_addr *remote = &p->raddr; |
199 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 200 | unsigned int h = 0; |
1da177e4 LT |
201 | int prio = 0; |
202 | ||
203 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
204 | prio = 1; | |
ddbe5032 | 205 | h = HASH(remote, local); |
1da177e4 | 206 | } |
3e6c9fb5 | 207 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
208 | } |
209 | ||
210 | /** | |
3144581c | 211 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
212 | * @t: tunnel to be added |
213 | **/ | |
214 | ||
215 | static void | |
2dd02c89 | 216 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 217 | { |
94767632 | 218 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 219 | |
8d79266b AS |
220 | if (t->parms.collect_md) |
221 | rcu_assign_pointer(ip6n->collect_md_tun, t); | |
cf778b00 ED |
222 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
223 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
224 | } |
225 | ||
226 | /** | |
3144581c | 227 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
228 | * @t: tunnel to be removed |
229 | **/ | |
230 | ||
231 | static void | |
2dd02c89 | 232 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 233 | { |
94767632 ED |
234 | struct ip6_tnl __rcu **tp; |
235 | struct ip6_tnl *iter; | |
236 | ||
8d79266b AS |
237 | if (t->parms.collect_md) |
238 | rcu_assign_pointer(ip6n->collect_md_tun, NULL); | |
239 | ||
94767632 ED |
240 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); |
241 | (iter = rtnl_dereference(*tp)) != NULL; | |
242 | tp = &iter->next) { | |
243 | if (t == iter) { | |
cf778b00 | 244 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
245 | break; |
246 | } | |
247 | } | |
248 | } | |
249 | ||
8560f226 ED |
250 | static void ip6_dev_free(struct net_device *dev) |
251 | { | |
cdf3464e MKL |
252 | struct ip6_tnl *t = netdev_priv(dev); |
253 | ||
0d3c703a | 254 | gro_cells_destroy(&t->gro_cells); |
607f725f | 255 | dst_cache_destroy(&t->dst_cache); |
8560f226 ED |
256 | free_percpu(dev->tstats); |
257 | free_netdev(dev); | |
258 | } | |
259 | ||
0b112457 ND |
260 | static int ip6_tnl_create2(struct net_device *dev) |
261 | { | |
262 | struct ip6_tnl *t = netdev_priv(dev); | |
263 | struct net *net = dev_net(dev); | |
264 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
265 | int err; | |
266 | ||
267 | t = netdev_priv(dev); | |
0b112457 | 268 | |
b6ee376c | 269 | dev->rtnl_link_ops = &ip6_link_ops; |
0b112457 ND |
270 | err = register_netdevice(dev); |
271 | if (err < 0) | |
272 | goto out; | |
273 | ||
274 | strcpy(t->parms.name, dev->name); | |
0b112457 ND |
275 | |
276 | dev_hold(dev); | |
277 | ip6_tnl_link(ip6n, t); | |
278 | return 0; | |
279 | ||
280 | out: | |
281 | return err; | |
282 | } | |
283 | ||
1da177e4 | 284 | /** |
2c53040f | 285 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
286 | * @p: tunnel parameters |
287 | * @pt: pointer to new tunnel | |
288 | * | |
289 | * Description: | |
290 | * Create tunnel matching given parameters. | |
1ab1457c YH |
291 | * |
292 | * Return: | |
37355565 | 293 | * created tunnel or error pointer |
1da177e4 LT |
294 | **/ |
295 | ||
c12b395a | 296 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
297 | { |
298 | struct net_device *dev; | |
299 | struct ip6_tnl *t; | |
300 | char name[IFNAMSIZ]; | |
37355565 | 301 | int err = -ENOMEM; |
1da177e4 | 302 | |
34cc7ba6 | 303 | if (p->name[0]) |
1da177e4 | 304 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
305 | else |
306 | sprintf(name, "ip6tnl%%d"); | |
307 | ||
c835a677 TG |
308 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
309 | ip6_tnl_dev_setup); | |
63159f29 | 310 | if (!dev) |
567131a7 | 311 | goto failed; |
1da177e4 | 312 | |
554eb277 PE |
313 | dev_net_set(dev, net); |
314 | ||
2941a486 | 315 | t = netdev_priv(dev); |
1da177e4 | 316 | t->parms = *p; |
0bd87628 | 317 | t->net = dev_net(dev); |
0b112457 | 318 | err = ip6_tnl_create2(dev); |
8560f226 ED |
319 | if (err < 0) |
320 | goto failed_free; | |
1da177e4 | 321 | |
567131a7 | 322 | return t; |
b37d428b PE |
323 | |
324 | failed_free: | |
8560f226 | 325 | ip6_dev_free(dev); |
567131a7 | 326 | failed: |
37355565 | 327 | return ERR_PTR(err); |
1da177e4 LT |
328 | } |
329 | ||
330 | /** | |
3144581c | 331 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 332 | * @p: tunnel parameters |
1da177e4 LT |
333 | * @create: != 0 if allowed to create new tunnel if no match found |
334 | * | |
335 | * Description: | |
3144581c | 336 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
337 | * based on @parms. If this is unsuccessful, but @create is set a new |
338 | * tunnel device is created and registered for use. | |
339 | * | |
340 | * Return: | |
37355565 | 341 | * matching tunnel or error pointer |
1da177e4 LT |
342 | **/ |
343 | ||
2dd02c89 | 344 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 345 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 346 | { |
b71d1d42 ED |
347 | const struct in6_addr *remote = &p->raddr; |
348 | const struct in6_addr *local = &p->laddr; | |
94767632 | 349 | struct ip6_tnl __rcu **tp; |
1da177e4 | 350 | struct ip6_tnl *t; |
2dd02c89 | 351 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 352 | |
94767632 ED |
353 | for (tp = ip6_tnl_bucket(ip6n, p); |
354 | (t = rtnl_dereference(*tp)) != NULL; | |
355 | tp = &t->next) { | |
1da177e4 | 356 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
357 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
358 | if (create) | |
37355565 | 359 | return ERR_PTR(-EEXIST); |
2b0bb01b | 360 | |
567131a7 | 361 | return t; |
2b0bb01b | 362 | } |
1da177e4 LT |
363 | } |
364 | if (!create) | |
37355565 | 365 | return ERR_PTR(-ENODEV); |
2dd02c89 | 366 | return ip6_tnl_create(net, p); |
1da177e4 LT |
367 | } |
368 | ||
369 | /** | |
3144581c | 370 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 371 | * @dev: the device to be destroyed |
1ab1457c | 372 | * |
1da177e4 | 373 | * Description: |
3144581c | 374 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
375 | **/ |
376 | ||
377 | static void | |
3144581c | 378 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 379 | { |
2941a486 | 380 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 381 | struct net *net = t->net; |
2dd02c89 | 382 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 383 | |
94767632 | 384 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 385 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 386 | else |
2dd02c89 | 387 | ip6_tnl_unlink(ip6n, t); |
607f725f | 388 | dst_cache_reset(&t->dst_cache); |
1da177e4 LT |
389 | dev_put(dev); |
390 | } | |
391 | ||
392 | /** | |
393 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
394 | * @skb: received socket buffer | |
395 | * | |
1ab1457c YH |
396 | * Return: |
397 | * 0 if none was found, | |
1da177e4 LT |
398 | * else index to encapsulation limit |
399 | **/ | |
400 | ||
c12b395a | 401 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 402 | { |
fbfa743a ED |
403 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; |
404 | unsigned int nhoff = raw - skb->data; | |
405 | unsigned int off = nhoff + sizeof(*ipv6h); | |
406 | u8 next, nexthdr = ipv6h->nexthdr; | |
1da177e4 LT |
407 | |
408 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
1da177e4 | 409 | struct ipv6_opt_hdr *hdr; |
fbfa743a ED |
410 | u16 optlen; |
411 | ||
412 | if (!pskb_may_pull(skb, off + sizeof(*hdr))) | |
1da177e4 LT |
413 | break; |
414 | ||
fbfa743a | 415 | hdr = (struct ipv6_opt_hdr *)(skb->data + off); |
1da177e4 LT |
416 | if (nexthdr == NEXTHDR_FRAGMENT) { |
417 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
418 | if (frag_hdr->frag_off) | |
419 | break; | |
420 | optlen = 8; | |
421 | } else if (nexthdr == NEXTHDR_AUTH) { | |
422 | optlen = (hdr->hdrlen + 2) << 2; | |
423 | } else { | |
424 | optlen = ipv6_optlen(hdr); | |
425 | } | |
fbfa743a ED |
426 | /* cache hdr->nexthdr, since pskb_may_pull() might |
427 | * invalidate hdr | |
428 | */ | |
429 | next = hdr->nexthdr; | |
1da177e4 | 430 | if (nexthdr == NEXTHDR_DEST) { |
fbfa743a ED |
431 | u16 i = 2; |
432 | ||
433 | /* Remember : hdr is no longer valid at this point. */ | |
434 | if (!pskb_may_pull(skb, off + optlen)) | |
435 | break; | |
436 | ||
1da177e4 LT |
437 | while (1) { |
438 | struct ipv6_tlv_tnl_enc_lim *tel; | |
439 | ||
440 | /* No more room for encapsulation limit */ | |
fbfa743a | 441 | if (i + sizeof(*tel) > optlen) |
1da177e4 LT |
442 | break; |
443 | ||
63117f09 | 444 | tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); |
1da177e4 LT |
445 | /* return index of option if found and valid */ |
446 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
447 | tel->length == 1) | |
fbfa743a | 448 | return i + off - nhoff; |
1da177e4 LT |
449 | /* else jump to next option */ |
450 | if (tel->type) | |
451 | i += tel->length + 2; | |
452 | else | |
453 | i++; | |
454 | } | |
455 | } | |
fbfa743a | 456 | nexthdr = next; |
1da177e4 LT |
457 | off += optlen; |
458 | } | |
459 | return 0; | |
460 | } | |
c12b395a | 461 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
462 | |
463 | /** | |
e490d1d8 | 464 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
465 | * |
466 | * Description: | |
e490d1d8 | 467 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
468 | * to the specifications in RFC 2473. |
469 | **/ | |
470 | ||
d2acc347 | 471 | static int |
502b0935 | 472 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 473 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 474 | { |
b71d1d42 | 475 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
476 | struct ip6_tnl *t; |
477 | int rel_msg = 0; | |
d5fdd6ba BH |
478 | u8 rel_type = ICMPV6_DEST_UNREACH; |
479 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 480 | u8 tproto; |
1da177e4 LT |
481 | __u32 rel_info = 0; |
482 | __u16 len; | |
d2acc347 | 483 | int err = -ENOENT; |
1da177e4 | 484 | |
1ab1457c YH |
485 | /* If the packet doesn't contain the original IPv6 header we are |
486 | in trouble since we might need the source address for further | |
1da177e4 LT |
487 | processing of the error. */ |
488 | ||
2922bc8a | 489 | rcu_read_lock(); |
e5d08d71 | 490 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); |
63159f29 | 491 | if (!t) |
1da177e4 LT |
492 | goto out; |
493 | ||
acf722f7 AA |
494 | tproto = ACCESS_ONCE(t->parms.proto); |
495 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
496 | goto out; |
497 | ||
d2acc347 HX |
498 | err = 0; |
499 | ||
e490d1d8 | 500 | switch (*type) { |
1da177e4 LT |
501 | __u32 teli; |
502 | struct ipv6_tlv_tnl_enc_lim *tel; | |
503 | __u32 mtu; | |
504 | case ICMPV6_DEST_UNREACH: | |
17a10c92 MB |
505 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
506 | t->parms.name); | |
1da177e4 LT |
507 | rel_msg = 1; |
508 | break; | |
509 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 510 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
17a10c92 MB |
511 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
512 | t->parms.name); | |
1da177e4 LT |
513 | rel_msg = 1; |
514 | } | |
515 | break; | |
516 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 517 | teli = 0; |
e490d1d8 | 518 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 519 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 520 | |
704eae1f | 521 | if (teli && teli == *info - 2) { |
1da177e4 LT |
522 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
523 | if (tel->encap_limit == 0) { | |
17a10c92 MB |
524 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
525 | t->parms.name); | |
1da177e4 LT |
526 | rel_msg = 1; |
527 | } | |
e87cc472 | 528 | } else { |
17a10c92 MB |
529 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
530 | t->parms.name); | |
1da177e4 LT |
531 | } |
532 | break; | |
533 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 534 | mtu = *info - offset; |
1da177e4 LT |
535 | if (mtu < IPV6_MIN_MTU) |
536 | mtu = IPV6_MIN_MTU; | |
537 | t->dev->mtu = mtu; | |
538 | ||
e5d08d71 IM |
539 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
540 | if (len > mtu) { | |
1da177e4 LT |
541 | rel_type = ICMPV6_PKT_TOOBIG; |
542 | rel_code = 0; | |
543 | rel_info = mtu; | |
544 | rel_msg = 1; | |
545 | } | |
546 | break; | |
547 | } | |
e490d1d8 YK |
548 | |
549 | *type = rel_type; | |
550 | *code = rel_code; | |
551 | *info = rel_info; | |
552 | *msg = rel_msg; | |
553 | ||
554 | out: | |
2922bc8a | 555 | rcu_read_unlock(); |
e490d1d8 YK |
556 | return err; |
557 | } | |
558 | ||
c4d3efaf YK |
559 | static int |
560 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 561 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
562 | { |
563 | int rel_msg = 0; | |
d5fdd6ba BH |
564 | u8 rel_type = type; |
565 | u8 rel_code = code; | |
704eae1f | 566 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
567 | int err; |
568 | struct sk_buff *skb2; | |
b71d1d42 | 569 | const struct iphdr *eiph; |
c4d3efaf | 570 | struct rtable *rt; |
31e4543d | 571 | struct flowi4 fl4; |
c4d3efaf | 572 | |
502b0935 YK |
573 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
574 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
575 | if (err < 0) |
576 | return err; | |
577 | ||
578 | if (rel_msg == 0) | |
579 | return 0; | |
580 | ||
581 | switch (rel_type) { | |
582 | case ICMPV6_DEST_UNREACH: | |
583 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
584 | return 0; | |
585 | rel_type = ICMP_DEST_UNREACH; | |
586 | rel_code = ICMP_HOST_UNREACH; | |
587 | break; | |
588 | case ICMPV6_PKT_TOOBIG: | |
589 | if (rel_code != 0) | |
590 | return 0; | |
591 | rel_type = ICMP_DEST_UNREACH; | |
592 | rel_code = ICMP_FRAG_NEEDED; | |
593 | break; | |
ec18d9a2 DM |
594 | case NDISC_REDIRECT: |
595 | rel_type = ICMP_REDIRECT; | |
596 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
597 | default: |
598 | return 0; | |
599 | } | |
600 | ||
601 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
602 | return 0; | |
603 | ||
604 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
605 | if (!skb2) | |
606 | return 0; | |
607 | ||
adf30907 ED |
608 | skb_dst_drop(skb2); |
609 | ||
c4d3efaf | 610 | skb_pull(skb2, offset); |
c1d2bbe1 | 611 | skb_reset_network_header(skb2); |
eddc9ec5 | 612 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
613 | |
614 | /* Try to guess incoming interface */ | |
31e4543d | 615 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
616 | eiph->saddr, 0, |
617 | 0, 0, | |
618 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 619 | if (IS_ERR(rt)) |
c4d3efaf YK |
620 | goto out; |
621 | ||
d8d1f30b | 622 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
623 | |
624 | /* route "incoming" packet */ | |
625 | if (rt->rt_flags & RTCF_LOCAL) { | |
626 | ip_rt_put(rt); | |
627 | rt = NULL; | |
31e4543d | 628 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
629 | eiph->daddr, eiph->saddr, |
630 | 0, 0, | |
631 | IPPROTO_IPIP, | |
632 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 633 | if (IS_ERR(rt) || |
d8d1f30b | 634 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
635 | if (!IS_ERR(rt)) |
636 | ip_rt_put(rt); | |
c4d3efaf YK |
637 | goto out; |
638 | } | |
b23dd4fe | 639 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
640 | } else { |
641 | ip_rt_put(rt); | |
642 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
643 | skb2->dev) || | |
adf30907 | 644 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
645 | goto out; |
646 | } | |
647 | ||
648 | /* change mtu on this route */ | |
649 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 650 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
651 | goto out; |
652 | ||
6700c270 | 653 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 654 | } |
1ed5c48f | 655 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 656 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 657 | |
704eae1f | 658 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
659 | |
660 | out: | |
661 | kfree_skb(skb2); | |
662 | return 0; | |
663 | } | |
664 | ||
e490d1d8 YK |
665 | static int |
666 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 667 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
668 | { |
669 | int rel_msg = 0; | |
d5fdd6ba BH |
670 | u8 rel_type = type; |
671 | u8 rel_code = code; | |
704eae1f | 672 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
673 | int err; |
674 | ||
502b0935 YK |
675 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
676 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
677 | if (err < 0) |
678 | return err; | |
679 | ||
680 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
681 | struct rt6_info *rt; |
682 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 683 | |
1da177e4 | 684 | if (!skb2) |
e490d1d8 | 685 | return 0; |
1da177e4 | 686 | |
adf30907 | 687 | skb_dst_drop(skb2); |
1da177e4 | 688 | skb_pull(skb2, offset); |
c1d2bbe1 | 689 | skb_reset_network_header(skb2); |
1da177e4 LT |
690 | |
691 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
692 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
693 | NULL, 0, 0); | |
1da177e4 | 694 | |
d1918542 DM |
695 | if (rt && rt->dst.dev) |
696 | skb2->dev = rt->dst.dev; | |
1da177e4 | 697 | |
3ffe533c | 698 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 699 | |
94e187c0 | 700 | ip6_rt_put(rt); |
1da177e4 LT |
701 | |
702 | kfree_skb(skb2); | |
703 | } | |
e490d1d8 YK |
704 | |
705 | return 0; | |
1da177e4 LT |
706 | } |
707 | ||
f4e0b4c5 ND |
708 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
709 | const struct ipv6hdr *ipv6h, | |
710 | struct sk_buff *skb) | |
c4d3efaf YK |
711 | { |
712 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
713 | ||
714 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 715 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 716 | |
f4e0b4c5 | 717 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
718 | } |
719 | ||
f4e0b4c5 ND |
720 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
721 | const struct ipv6hdr *ipv6h, | |
722 | struct sk_buff *skb) | |
1da177e4 | 723 | { |
8359925b | 724 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 725 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 726 | |
f4e0b4c5 | 727 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 728 | } |
8359925b | 729 | |
c12b395a | 730 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
731 | const struct in6_addr *laddr, |
732 | const struct in6_addr *raddr) | |
733 | { | |
c12b395a | 734 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
735 | int ltype = ipv6_addr_type(laddr); |
736 | int rtype = ipv6_addr_type(raddr); | |
737 | __u32 flags = 0; | |
738 | ||
739 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
740 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
741 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
742 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
743 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
744 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
745 | if (ltype&IPV6_ADDR_UNICAST) | |
746 | flags |= IP6_TNL_F_CAP_XMIT; | |
747 | if (rtype&IPV6_ADDR_UNICAST) | |
748 | flags |= IP6_TNL_F_CAP_RCV; | |
749 | } | |
750 | return flags; | |
751 | } | |
c12b395a | 752 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 753 | |
f1a28eab | 754 | /* called with rcu_read_lock() */ |
c12b395a | 755 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
756 | const struct in6_addr *laddr, |
757 | const struct in6_addr *raddr) | |
09c6bbf0 | 758 | { |
c12b395a | 759 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 760 | int ret = 0; |
0bd87628 | 761 | struct net *net = t->net; |
09c6bbf0 | 762 | |
d0087b29 VN |
763 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
764 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
765 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 766 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
767 | |
768 | if (p->link) | |
f1a28eab | 769 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 770 | |
d0087b29 VN |
771 | if ((ipv6_addr_is_multicast(laddr) || |
772 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
773 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 774 | ret = 1; |
09c6bbf0 VN |
775 | } |
776 | return ret; | |
777 | } | |
c12b395a | 778 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 | 779 | |
0d3c703a TH |
780 | static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, |
781 | const struct tnl_ptk_info *tpi, | |
782 | struct metadata_dst *tun_dst, | |
783 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
784 | const struct ipv6hdr *ipv6h, | |
785 | struct sk_buff *skb), | |
786 | bool log_ecn_err) | |
1da177e4 | 787 | { |
0d3c703a | 788 | struct pcpu_sw_netstats *tstats; |
b71d1d42 | 789 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 790 | int err; |
1da177e4 | 791 | |
0d3c703a TH |
792 | if ((!(tpi->flags & TUNNEL_CSUM) && |
793 | (tunnel->parms.i_flags & TUNNEL_CSUM)) || | |
794 | ((tpi->flags & TUNNEL_CSUM) && | |
795 | !(tunnel->parms.i_flags & TUNNEL_CSUM))) { | |
796 | tunnel->dev->stats.rx_crc_errors++; | |
797 | tunnel->dev->stats.rx_errors++; | |
798 | goto drop; | |
799 | } | |
8560f226 | 800 | |
0d3c703a TH |
801 | if (tunnel->parms.i_flags & TUNNEL_SEQ) { |
802 | if (!(tpi->flags & TUNNEL_SEQ) || | |
803 | (tunnel->i_seqno && | |
804 | (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
805 | tunnel->dev->stats.rx_fifo_errors++; | |
806 | tunnel->dev->stats.rx_errors++; | |
807 | goto drop; | |
502b0935 | 808 | } |
0d3c703a TH |
809 | tunnel->i_seqno = ntohl(tpi->seq) + 1; |
810 | } | |
502b0935 | 811 | |
0d3c703a | 812 | skb->protocol = tpi->proto; |
1da177e4 | 813 | |
0d3c703a TH |
814 | /* Warning: All skb pointers will be invalidated! */ |
815 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
816 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
817 | tunnel->dev->stats.rx_length_errors++; | |
818 | tunnel->dev->stats.rx_errors++; | |
819 | goto drop; | |
1da177e4 | 820 | } |
0d3c703a TH |
821 | |
822 | ipv6h = ipv6_hdr(skb); | |
823 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
824 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
825 | } else { | |
826 | skb->dev = tunnel->dev; | |
827 | } | |
828 | ||
829 | skb_reset_network_header(skb); | |
830 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
831 | ||
832 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); | |
833 | ||
834 | err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); | |
835 | if (unlikely(err)) { | |
836 | if (log_ecn_err) | |
837 | net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", | |
838 | &ipv6h->saddr, | |
839 | ipv6_get_dsfield(ipv6h)); | |
840 | if (err > 1) { | |
841 | ++tunnel->dev->stats.rx_frame_errors; | |
842 | ++tunnel->dev->stats.rx_errors; | |
843 | goto drop; | |
f4e0b4c5 | 844 | } |
0d3c703a | 845 | } |
f4e0b4c5 | 846 | |
0d3c703a TH |
847 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
848 | u64_stats_update_begin(&tstats->syncp); | |
849 | tstats->rx_packets++; | |
850 | tstats->rx_bytes += skb->len; | |
851 | u64_stats_update_end(&tstats->syncp); | |
8560f226 | 852 | |
0d3c703a | 853 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
8990f468 | 854 | |
8d79266b AS |
855 | if (tun_dst) |
856 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
857 | ||
0d3c703a TH |
858 | gro_cells_receive(&tunnel->gro_cells, skb); |
859 | return 0; | |
860 | ||
861 | drop: | |
862 | kfree_skb(skb); | |
863 | return 0; | |
864 | } | |
865 | ||
866 | int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, | |
867 | const struct tnl_ptk_info *tpi, | |
868 | struct metadata_dst *tun_dst, | |
869 | bool log_ecn_err) | |
870 | { | |
871 | return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, | |
872 | log_ecn_err); | |
873 | } | |
874 | EXPORT_SYMBOL(ip6_tnl_rcv); | |
875 | ||
876 | static const struct tnl_ptk_info tpi_v6 = { | |
877 | /* no tunnel info required for ipxip6. */ | |
878 | .proto = htons(ETH_P_IPV6), | |
879 | }; | |
880 | ||
881 | static const struct tnl_ptk_info tpi_v4 = { | |
882 | /* no tunnel info required for ipxip6. */ | |
883 | .proto = htons(ETH_P_IP), | |
884 | }; | |
885 | ||
886 | static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, | |
887 | const struct tnl_ptk_info *tpi, | |
888 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
889 | const struct ipv6hdr *ipv6h, | |
890 | struct sk_buff *skb)) | |
891 | { | |
892 | struct ip6_tnl *t; | |
893 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
8d79266b | 894 | struct metadata_dst *tun_dst = NULL; |
0d3c703a TH |
895 | int ret = -1; |
896 | ||
897 | rcu_read_lock(); | |
898 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); | |
899 | ||
900 | if (t) { | |
901 | u8 tproto = ACCESS_ONCE(t->parms.proto); | |
902 | ||
903 | if (tproto != ipproto && tproto != 0) | |
904 | goto drop; | |
905 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
906 | goto drop; | |
907 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) | |
908 | goto drop; | |
909 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
910 | goto drop; | |
8d79266b AS |
911 | if (t->parms.collect_md) { |
912 | tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); | |
913 | if (!tun_dst) | |
914 | return 0; | |
915 | } | |
916 | ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, | |
0d3c703a | 917 | log_ecn_error); |
1da177e4 | 918 | } |
0d3c703a | 919 | |
2922bc8a | 920 | rcu_read_unlock(); |
50fba2aa | 921 | |
0d3c703a TH |
922 | return ret; |
923 | ||
924 | drop: | |
925 | rcu_read_unlock(); | |
50fba2aa HX |
926 | kfree_skb(skb); |
927 | return 0; | |
1da177e4 LT |
928 | } |
929 | ||
c4d3efaf YK |
930 | static int ip4ip6_rcv(struct sk_buff *skb) |
931 | { | |
ca4aa976 | 932 | return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, |
0d3c703a | 933 | ip4ip6_dscp_ecn_decapsulate); |
c4d3efaf YK |
934 | } |
935 | ||
8359925b YK |
936 | static int ip6ip6_rcv(struct sk_buff *skb) |
937 | { | |
0d3c703a TH |
938 | return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, |
939 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
940 | } |
941 | ||
6fb32dde VN |
942 | struct ipv6_tel_txoption { |
943 | struct ipv6_txoptions ops; | |
944 | __u8 dst_opt[8]; | |
945 | }; | |
1da177e4 | 946 | |
6fb32dde VN |
947 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
948 | { | |
949 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 950 | |
6fb32dde VN |
951 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
952 | opt->dst_opt[3] = 1; | |
953 | opt->dst_opt[4] = encap_limit; | |
954 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
955 | opt->dst_opt[6] = 1; | |
1da177e4 | 956 | |
89a23c8b | 957 | opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
6fb32dde | 958 | opt->ops.opt_nflen = 8; |
1da177e4 LT |
959 | } |
960 | ||
961 | /** | |
3144581c | 962 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 963 | * @t: the outgoing tunnel device |
1ab1457c | 964 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
965 | * |
966 | * Description: | |
1ab1457c | 967 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
968 | * doesn't match source of incoming packet. |
969 | * | |
1ab1457c | 970 | * Return: |
1da177e4 LT |
971 | * 1 if conflict, |
972 | * 0 else | |
973 | **/ | |
974 | ||
92113bfd | 975 | static inline bool |
b71d1d42 | 976 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
977 | { |
978 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
979 | } | |
980 | ||
d5005140 SK |
981 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
982 | const struct in6_addr *laddr, | |
983 | const struct in6_addr *raddr) | |
09c6bbf0 | 984 | { |
c12b395a | 985 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 986 | int ret = 0; |
0bd87628 | 987 | struct net *net = t->net; |
09c6bbf0 | 988 | |
d5005140 SK |
989 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
990 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
991 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
992 | struct net_device *ldev = NULL; |
993 | ||
f1a28eab | 994 | rcu_read_lock(); |
09c6bbf0 | 995 | if (p->link) |
f1a28eab | 996 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 997 | |
d5005140 | 998 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
999 | pr_warn("%s xmit: Local address not yet configured!\n", |
1000 | p->name); | |
d5005140 SK |
1001 | else if (!ipv6_addr_is_multicast(raddr) && |
1002 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
1003 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
1004 | p->name); | |
09c6bbf0 VN |
1005 | else |
1006 | ret = 1; | |
f1a28eab | 1007 | rcu_read_unlock(); |
09c6bbf0 VN |
1008 | } |
1009 | return ret; | |
1010 | } | |
c12b395a | 1011 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
1012 | ||
1da177e4 | 1013 | /** |
8eb30be0 | 1014 | * ip6_tnl_xmit - encapsulate packet and send |
1da177e4 | 1015 | * @skb: the outgoing socket buffer |
1ab1457c | 1016 | * @dev: the outgoing tunnel device |
61ec2aec | 1017 | * @dsfield: dscp code for outer header |
8eb30be0 | 1018 | * @fl6: flow of tunneled packet |
61ec2aec YK |
1019 | * @encap_limit: encapsulation limit |
1020 | * @pmtu: Path MTU is stored if packet is too big | |
8eb30be0 | 1021 | * @proto: next header value |
1da177e4 LT |
1022 | * |
1023 | * Description: | |
1024 | * Build new header and do some sanity checks on the packet before sending | |
1025 | * it. | |
1026 | * | |
1ab1457c | 1027 | * Return: |
c4d3efaf | 1028 | * 0 on success |
61ec2aec YK |
1029 | * -1 fail |
1030 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
1031 | **/ |
1032 | ||
8eb30be0 TH |
1033 | int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, |
1034 | struct flowi6 *fl6, int encap_limit, __u32 *pmtu, | |
1035 | __u8 proto) | |
1da177e4 | 1036 | { |
2941a486 | 1037 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 1038 | struct net *net = t->net; |
3dca02af | 1039 | struct net_device_stats *stats = &t->dev->stats; |
199ab00f | 1040 | struct ipv6hdr *ipv6h; |
6fb32dde | 1041 | struct ipv6_tel_txoption opt; |
d24f22f3 | 1042 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
1043 | struct net_device *tdev; |
1044 | int mtu; | |
058214a4 TH |
1045 | unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; |
1046 | unsigned int max_headroom = psh_hlen; | |
b5c2d495 | 1047 | bool use_cache = false; |
8d79266b | 1048 | u8 hop_limit; |
61ec2aec | 1049 | int err = -1; |
1da177e4 | 1050 | |
8d79266b AS |
1051 | if (t->parms.collect_md) { |
1052 | hop_limit = skb_tunnel_info(skb)->key.ttl; | |
1053 | goto route_lookup; | |
1054 | } else { | |
1055 | hop_limit = t->parms.hop_limit; | |
1056 | } | |
1057 | ||
ea3dc960 SK |
1058 | /* NBMA tunnel */ |
1059 | if (ipv6_addr_any(&t->parms.raddr)) { | |
199ab00f WC |
1060 | if (skb->protocol == htons(ETH_P_IPV6)) { |
1061 | struct in6_addr *addr6; | |
1062 | struct neighbour *neigh; | |
1063 | int addr_type; | |
ea3dc960 | 1064 | |
199ab00f WC |
1065 | if (!skb_dst(skb)) |
1066 | goto tx_err_link_failure; | |
ea3dc960 | 1067 | |
199ab00f WC |
1068 | neigh = dst_neigh_lookup(skb_dst(skb), |
1069 | &ipv6_hdr(skb)->daddr); | |
1070 | if (!neigh) | |
1071 | goto tx_err_link_failure; | |
ea3dc960 | 1072 | |
199ab00f WC |
1073 | addr6 = (struct in6_addr *)&neigh->primary_key; |
1074 | addr_type = ipv6_addr_type(addr6); | |
ea3dc960 | 1075 | |
199ab00f WC |
1076 | if (addr_type == IPV6_ADDR_ANY) |
1077 | addr6 = &ipv6_hdr(skb)->daddr; | |
ea3dc960 | 1078 | |
199ab00f WC |
1079 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); |
1080 | neigh_release(neigh); | |
1081 | } | |
b5c2d495 PA |
1082 | } else if (!(t->parms.flags & |
1083 | (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) { | |
1084 | /* enable the cache only only if the routing decision does | |
1085 | * not depend on the current inner header value | |
1086 | */ | |
1087 | use_cache = true; | |
1088 | } | |
1089 | ||
1090 | if (use_cache) | |
607f725f | 1091 | dst = dst_cache_get(&t->dst_cache); |
d5005140 SK |
1092 | |
1093 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1094 | goto tx_err_link_failure; | |
1095 | ||
89b02126 | 1096 | if (!dst) { |
8d79266b | 1097 | route_lookup: |
cdf3464e | 1098 | dst = ip6_route_output(net, NULL, fl6); |
1da177e4 | 1099 | |
cdf3464e | 1100 | if (dst->error) |
a57ebc90 | 1101 | goto tx_err_link_failure; |
cdf3464e MKL |
1102 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
1103 | if (IS_ERR(dst)) { | |
1104 | err = PTR_ERR(dst); | |
1105 | dst = NULL; | |
452edd59 DM |
1106 | goto tx_err_link_failure; |
1107 | } | |
8d79266b AS |
1108 | if (t->parms.collect_md && |
1109 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, | |
1110 | &fl6->daddr, 0, &fl6->saddr)) | |
1111 | goto tx_err_link_failure; | |
cdf3464e | 1112 | ndst = dst; |
a57ebc90 | 1113 | } |
1da177e4 LT |
1114 | |
1115 | tdev = dst->dev; | |
1116 | ||
1117 | if (tdev == dev) { | |
1118 | stats->collisions++; | |
e87cc472 JP |
1119 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1120 | t->parms.name); | |
1da177e4 LT |
1121 | goto tx_err_dst_release; |
1122 | } | |
02ca0423 | 1123 | mtu = dst_mtu(dst) - psh_hlen - t->tun_hlen; |
6fb32dde | 1124 | if (encap_limit >= 0) { |
1da177e4 LT |
1125 | max_headroom += 8; |
1126 | mtu -= 8; | |
1127 | } | |
1128 | if (mtu < IPV6_MIN_MTU) | |
1129 | mtu = IPV6_MIN_MTU; | |
8d79266b | 1130 | if (skb_dst(skb) && !t->parms.collect_md) |
6700c270 | 1131 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
02ca0423 | 1132 | if (skb->len - t->tun_hlen > mtu && !skb_is_gso(skb)) { |
61ec2aec YK |
1133 | *pmtu = mtu; |
1134 | err = -EMSGSIZE; | |
1da177e4 LT |
1135 | goto tx_err_dst_release; |
1136 | } | |
1137 | ||
8eb30be0 TH |
1138 | if (t->err_count > 0) { |
1139 | if (time_before(jiffies, | |
1140 | t->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
1141 | t->err_count--; | |
1142 | ||
1143 | dst_link_failure(skb); | |
1144 | } else { | |
1145 | t->err_count = 0; | |
1146 | } | |
1147 | } | |
1148 | ||
963a88b3 | 1149 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1150 | |
1da177e4 LT |
1151 | /* |
1152 | * Okay, now see if we can stuff it in the buffer as-is. | |
1153 | */ | |
1154 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1155 | |
cfbba49d PM |
1156 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1157 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1158 | struct sk_buff *new_skb; |
1ab1457c | 1159 | |
e5d08d71 IM |
1160 | new_skb = skb_realloc_headroom(skb, max_headroom); |
1161 | if (!new_skb) | |
1da177e4 LT |
1162 | goto tx_err_dst_release; |
1163 | ||
1164 | if (skb->sk) | |
1165 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1166 | consume_skb(skb); |
1da177e4 LT |
1167 | skb = new_skb; |
1168 | } | |
cdf3464e | 1169 | |
8d79266b AS |
1170 | if (t->parms.collect_md) { |
1171 | if (t->encap.type != TUNNEL_ENCAP_NONE) | |
1172 | goto tx_err_dst_release; | |
1173 | } else { | |
b5c2d495 | 1174 | if (use_cache && ndst) |
8d79266b AS |
1175 | dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); |
1176 | } | |
cdf3464e MKL |
1177 | skb_dst_set(skb, dst); |
1178 | ||
6fb32dde VN |
1179 | if (encap_limit >= 0) { |
1180 | init_tel_txopt(&opt, encap_limit); | |
89a23c8b | 1181 | ipv6_push_frag_opts(skb, &opt.ops, &proto); |
6fb32dde | 1182 | } |
3d483058 | 1183 | |
058214a4 TH |
1184 | /* Calculate max headroom for all the headers and adjust |
1185 | * needed_headroom if necessary. | |
1186 | */ | |
8eb30be0 | 1187 | max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) |
058214a4 | 1188 | + dst->header_len + t->hlen; |
8eb30be0 TH |
1189 | if (max_headroom > dev->needed_headroom) |
1190 | dev->needed_headroom = max_headroom; | |
1191 | ||
058214a4 TH |
1192 | err = ip6_tnl_encap(skb, t, &proto, fl6); |
1193 | if (err) | |
1194 | return err; | |
1195 | ||
e2d1bca7 ACM |
1196 | skb_push(skb, sizeof(struct ipv6hdr)); |
1197 | skb_reset_network_header(skb); | |
0660e03f | 1198 | ipv6h = ipv6_hdr(skb); |
0e9a7095 | 1199 | ip6_flow_hdr(ipv6h, dsfield, |
42240901 | 1200 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
8d79266b | 1201 | ipv6h->hop_limit = hop_limit; |
1da177e4 | 1202 | ipv6h->nexthdr = proto; |
4e3fd7a0 AD |
1203 | ipv6h->saddr = fl6->saddr; |
1204 | ipv6h->daddr = fl6->daddr; | |
79b16aad | 1205 | ip6tunnel_xmit(NULL, skb, dev); |
1da177e4 LT |
1206 | return 0; |
1207 | tx_err_link_failure: | |
1208 | stats->tx_carrier_errors++; | |
1209 | dst_link_failure(skb); | |
1210 | tx_err_dst_release: | |
cdf3464e | 1211 | dst_release(dst); |
61ec2aec YK |
1212 | return err; |
1213 | } | |
8eb30be0 | 1214 | EXPORT_SYMBOL(ip6_tnl_xmit); |
61ec2aec | 1215 | |
c4d3efaf YK |
1216 | static inline int |
1217 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1218 | { | |
1219 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1220 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1221 | int encap_limit = -1; |
4c9483b2 | 1222 | struct flowi6 fl6; |
c4d3efaf YK |
1223 | __u8 dsfield; |
1224 | __u32 mtu; | |
acf722f7 | 1225 | u8 tproto; |
c4d3efaf YK |
1226 | int err; |
1227 | ||
5146d1f1 BH |
1228 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1229 | ||
acf722f7 | 1230 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1231 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1232 | return -1; |
1233 | ||
8d79266b AS |
1234 | if (t->parms.collect_md) { |
1235 | struct ip_tunnel_info *tun_info; | |
1236 | const struct ip_tunnel_key *key; | |
c4d3efaf | 1237 | |
8d79266b AS |
1238 | tun_info = skb_tunnel_info(skb); |
1239 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
1240 | ip_tunnel_info_af(tun_info) != AF_INET6)) | |
1241 | return -1; | |
1242 | key = &tun_info->key; | |
1243 | memset(&fl6, 0, sizeof(fl6)); | |
1244 | fl6.flowi6_proto = IPPROTO_IPIP; | |
1245 | fl6.daddr = key->u.ipv6.dst; | |
1246 | fl6.flowlabel = key->label; | |
0e9a7095 | 1247 | dsfield = ip6_tclass(key->label); |
8d79266b AS |
1248 | } else { |
1249 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1250 | encap_limit = t->parms.encap_limit; | |
c4d3efaf | 1251 | |
8d79266b AS |
1252 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
1253 | fl6.flowi6_proto = IPPROTO_IPIP; | |
1254 | ||
1255 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
0e9a7095 PD |
1256 | dsfield = ipv4_get_dsfield(iph); |
1257 | else | |
1258 | dsfield = ip6_tclass(t->parms.flowinfo); | |
8d79266b AS |
1259 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1260 | fl6.flowi6_mark = skb->mark; | |
0a473b82 CG |
1261 | else |
1262 | fl6.flowi6_mark = t->parms.fwmark; | |
8d79266b | 1263 | } |
c4d3efaf | 1264 | |
e2d118a1 LC |
1265 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
1266 | ||
b8921ca8 TH |
1267 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
1268 | return -1; | |
1269 | ||
0e9a7095 PD |
1270 | dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); |
1271 | ||
b8921ca8 TH |
1272 | skb_set_inner_ipproto(skb, IPPROTO_IPIP); |
1273 | ||
8eb30be0 TH |
1274 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
1275 | IPPROTO_IPIP); | |
c4d3efaf YK |
1276 | if (err != 0) { |
1277 | /* XXX: send ICMP error even if DF is not set. */ | |
1278 | if (err == -EMSGSIZE) | |
1279 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1280 | htonl(mtu)); | |
1281 | return -1; | |
1282 | } | |
1283 | ||
1284 | return 0; | |
1285 | } | |
1286 | ||
61ec2aec YK |
1287 | static inline int |
1288 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1289 | { | |
1290 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1291 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1292 | int encap_limit = -1; |
1293 | __u16 offset; | |
4c9483b2 | 1294 | struct flowi6 fl6; |
61ec2aec YK |
1295 | __u8 dsfield; |
1296 | __u32 mtu; | |
acf722f7 | 1297 | u8 tproto; |
61ec2aec YK |
1298 | int err; |
1299 | ||
acf722f7 AA |
1300 | tproto = ACCESS_ONCE(t->parms.proto); |
1301 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1302 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1303 | return -1; |
1304 | ||
8d79266b AS |
1305 | if (t->parms.collect_md) { |
1306 | struct ip_tunnel_info *tun_info; | |
1307 | const struct ip_tunnel_key *key; | |
1308 | ||
1309 | tun_info = skb_tunnel_info(skb); | |
1310 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
1311 | ip_tunnel_info_af(tun_info) != AF_INET6)) | |
61ec2aec | 1312 | return -1; |
8d79266b AS |
1313 | key = &tun_info->key; |
1314 | memset(&fl6, 0, sizeof(fl6)); | |
1315 | fl6.flowi6_proto = IPPROTO_IPV6; | |
1316 | fl6.daddr = key->u.ipv6.dst; | |
1317 | fl6.flowlabel = key->label; | |
0e9a7095 | 1318 | dsfield = ip6_tclass(key->label); |
8d79266b AS |
1319 | } else { |
1320 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); | |
21b995a9 ED |
1321 | /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ |
1322 | ipv6h = ipv6_hdr(skb); | |
8d79266b AS |
1323 | if (offset > 0) { |
1324 | struct ipv6_tlv_tnl_enc_lim *tel; | |
1325 | ||
1326 | tel = (void *)&skb_network_header(skb)[offset]; | |
1327 | if (tel->encap_limit == 0) { | |
1328 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
1329 | ICMPV6_HDR_FIELD, offset + 2); | |
1330 | return -1; | |
1331 | } | |
1332 | encap_limit = tel->encap_limit - 1; | |
1333 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { | |
1334 | encap_limit = t->parms.encap_limit; | |
61ec2aec | 1335 | } |
61ec2aec | 1336 | |
8d79266b AS |
1337 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
1338 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec | 1339 | |
8d79266b | 1340 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
0e9a7095 PD |
1341 | dsfield = ipv6_get_dsfield(ipv6h); |
1342 | else | |
1343 | dsfield = ip6_tclass(t->parms.flowinfo); | |
8d79266b AS |
1344 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
1345 | fl6.flowlabel |= ip6_flowlabel(ipv6h); | |
1346 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
1347 | fl6.flowi6_mark = skb->mark; | |
0a473b82 CG |
1348 | else |
1349 | fl6.flowi6_mark = t->parms.fwmark; | |
8d79266b | 1350 | } |
61ec2aec | 1351 | |
e2d118a1 LC |
1352 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
1353 | ||
815d22e5 TH |
1354 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
1355 | return -1; | |
1356 | ||
0e9a7095 PD |
1357 | dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); |
1358 | ||
815d22e5 TH |
1359 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
1360 | ||
8eb30be0 TH |
1361 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
1362 | IPPROTO_IPV6); | |
61ec2aec YK |
1363 | if (err != 0) { |
1364 | if (err == -EMSGSIZE) | |
3ffe533c | 1365 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1366 | return -1; |
1367 | } | |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | ||
6fef4c0c | 1372 | static netdev_tx_t |
8eb30be0 | 1373 | ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) |
61ec2aec YK |
1374 | { |
1375 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1376 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1377 | int ret; |
1378 | ||
61ec2aec | 1379 | switch (skb->protocol) { |
60678040 | 1380 | case htons(ETH_P_IP): |
c4d3efaf YK |
1381 | ret = ip4ip6_tnl_xmit(skb, dev); |
1382 | break; | |
60678040 | 1383 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1384 | ret = ip6ip6_tnl_xmit(skb, dev); |
1385 | break; | |
1386 | default: | |
1387 | goto tx_err; | |
1388 | } | |
1389 | ||
1390 | if (ret < 0) | |
1391 | goto tx_err; | |
1392 | ||
6ed10654 | 1393 | return NETDEV_TX_OK; |
61ec2aec | 1394 | |
1da177e4 LT |
1395 | tx_err: |
1396 | stats->tx_errors++; | |
1397 | stats->tx_dropped++; | |
1398 | kfree_skb(skb); | |
6ed10654 | 1399 | return NETDEV_TX_OK; |
1da177e4 LT |
1400 | } |
1401 | ||
3144581c | 1402 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1403 | { |
1404 | struct net_device *dev = t->dev; | |
c12b395a | 1405 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1406 | struct flowi6 *fl6 = &t->fl.u.ip6; |
058214a4 | 1407 | int t_hlen; |
1da177e4 | 1408 | |
3a6d54c5 JP |
1409 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1410 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1411 | |
1412 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1413 | fl6->saddr = p->laddr; |
1414 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1415 | fl6->flowi6_oif = p->link; |
1416 | fl6->flowlabel = 0; | |
1da177e4 LT |
1417 | |
1418 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1419 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1420 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1421 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1422 | |
d0087b29 VN |
1423 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1424 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1425 | |
1426 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1427 | dev->flags |= IFF_POINTOPOINT; | |
1428 | else | |
1429 | dev->flags &= ~IFF_POINTOPOINT; | |
1430 | ||
058214a4 TH |
1431 | t->tun_hlen = 0; |
1432 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1433 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1434 | ||
1da177e4 | 1435 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
305d4b3c VN |
1436 | int strict = (ipv6_addr_type(&p->raddr) & |
1437 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1438 | ||
0bd87628 | 1439 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1440 | &p->raddr, &p->laddr, |
305d4b3c | 1441 | p->link, strict); |
1da177e4 | 1442 | |
63159f29 | 1443 | if (!rt) |
1da177e4 LT |
1444 | return; |
1445 | ||
d1918542 DM |
1446 | if (rt->dst.dev) { |
1447 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
058214a4 | 1448 | t_hlen; |
1da177e4 | 1449 | |
058214a4 | 1450 | dev->mtu = rt->dst.dev->mtu - t_hlen; |
381601e5 | 1451 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1452 | dev->mtu -= 8; |
1da177e4 LT |
1453 | |
1454 | if (dev->mtu < IPV6_MIN_MTU) | |
1455 | dev->mtu = IPV6_MIN_MTU; | |
1456 | } | |
94e187c0 | 1457 | ip6_rt_put(rt); |
1da177e4 LT |
1458 | } |
1459 | } | |
1460 | ||
1461 | /** | |
3144581c | 1462 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1463 | * @t: tunnel to be changed |
1464 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1465 | * |
1466 | * Description: | |
3144581c | 1467 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1468 | **/ |
1469 | ||
1470 | static int | |
c12b395a | 1471 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1472 | { |
4e3fd7a0 AD |
1473 | t->parms.laddr = p->laddr; |
1474 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1475 | t->parms.flags = p->flags; |
1476 | t->parms.hop_limit = p->hop_limit; | |
1477 | t->parms.encap_limit = p->encap_limit; | |
1478 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1479 | t->parms.link = p->link; |
502b0935 | 1480 | t->parms.proto = p->proto; |
0a473b82 | 1481 | t->parms.fwmark = p->fwmark; |
607f725f | 1482 | dst_cache_reset(&t->dst_cache); |
3144581c | 1483 | ip6_tnl_link_config(t); |
1da177e4 LT |
1484 | return 0; |
1485 | } | |
1486 | ||
0b112457 ND |
1487 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1488 | { | |
0bd87628 | 1489 | struct net *net = t->net; |
0b112457 ND |
1490 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1491 | int err; | |
1492 | ||
1493 | ip6_tnl_unlink(ip6n, t); | |
1494 | synchronize_net(); | |
1495 | err = ip6_tnl_change(t, p); | |
1496 | ip6_tnl_link(ip6n, t); | |
1497 | netdev_state_change(t->dev); | |
1498 | return err; | |
1499 | } | |
1500 | ||
acf722f7 AA |
1501 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1502 | { | |
1503 | /* for default tnl0 device allow to change only the proto */ | |
1504 | t->parms.proto = p->proto; | |
1505 | netdev_state_change(t->dev); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
c12b395a | 1509 | static void |
1510 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1511 | { | |
1512 | p->laddr = u->laddr; | |
1513 | p->raddr = u->raddr; | |
1514 | p->flags = u->flags; | |
1515 | p->hop_limit = u->hop_limit; | |
1516 | p->encap_limit = u->encap_limit; | |
1517 | p->flowinfo = u->flowinfo; | |
1518 | p->link = u->link; | |
1519 | p->proto = u->proto; | |
1520 | memcpy(p->name, u->name, sizeof(u->name)); | |
1521 | } | |
1522 | ||
1523 | static void | |
1524 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1525 | { | |
1526 | u->laddr = p->laddr; | |
1527 | u->raddr = p->raddr; | |
1528 | u->flags = p->flags; | |
1529 | u->hop_limit = p->hop_limit; | |
1530 | u->encap_limit = p->encap_limit; | |
1531 | u->flowinfo = p->flowinfo; | |
1532 | u->link = p->link; | |
1533 | u->proto = p->proto; | |
1534 | memcpy(u->name, p->name, sizeof(u->name)); | |
1535 | } | |
1536 | ||
1da177e4 | 1537 | /** |
3144581c | 1538 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1539 | * @dev: virtual device associated with tunnel |
1540 | * @ifr: parameters passed from userspace | |
1541 | * @cmd: command to be performed | |
1542 | * | |
1543 | * Description: | |
3144581c | 1544 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1545 | * from userspace. |
1da177e4 LT |
1546 | * |
1547 | * The possible commands are the following: | |
1548 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1549 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1550 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1551 | * %SIOCDELTUNNEL: delete tunnel | |
1552 | * | |
1ab1457c | 1553 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1554 | * initialization, can be used for creating other tunnel devices. |
1555 | * | |
1556 | * Return: | |
1557 | * 0 on success, | |
1558 | * %-EFAULT if unable to copy data to or from userspace, | |
1559 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1560 | * %-EINVAL if passed tunnel parameters are invalid, | |
1561 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1562 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1563 | **/ | |
1564 | ||
1565 | static int | |
3144581c | 1566 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1567 | { |
1568 | int err = 0; | |
1da177e4 | 1569 | struct ip6_tnl_parm p; |
c12b395a | 1570 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1571 | struct ip6_tnl *t = netdev_priv(dev); |
1572 | struct net *net = t->net; | |
2dd02c89 | 1573 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 1574 | |
0d3c703a TH |
1575 | memset(&p1, 0, sizeof(p1)); |
1576 | ||
1da177e4 LT |
1577 | switch (cmd) { |
1578 | case SIOCGETTUNNEL: | |
15820e12 | 1579 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1580 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1581 | err = -EFAULT; |
1582 | break; | |
1583 | } | |
c12b395a | 1584 | ip6_tnl_parm_from_user(&p1, &p); |
1585 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1586 | if (IS_ERR(t)) |
74462f0d | 1587 | t = netdev_priv(dev); |
5ef5d6c5 DC |
1588 | } else { |
1589 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1590 | } |
c12b395a | 1591 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1592 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1593 | err = -EFAULT; |
1594 | } | |
1595 | break; | |
1596 | case SIOCADDTUNNEL: | |
1597 | case SIOCCHGTUNNEL: | |
1598 | err = -EPERM; | |
af31f412 | 1599 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1600 | break; |
567131a7 | 1601 | err = -EFAULT; |
67ba4152 | 1602 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1603 | break; |
567131a7 | 1604 | err = -EINVAL; |
502b0935 YK |
1605 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1606 | p.proto != 0) | |
1da177e4 | 1607 | break; |
c12b395a | 1608 | ip6_tnl_parm_from_user(&p1, &p); |
1609 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1610 | if (cmd == SIOCCHGTUNNEL) { |
37355565 | 1611 | if (!IS_ERR(t)) { |
567131a7 VN |
1612 | if (t->dev != dev) { |
1613 | err = -EEXIST; | |
1614 | break; | |
1615 | } | |
1616 | } else | |
1617 | t = netdev_priv(dev); | |
acf722f7 AA |
1618 | if (dev == ip6n->fb_tnl_dev) |
1619 | err = ip6_tnl0_update(t, &p1); | |
1620 | else | |
1621 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1622 | } |
37355565 | 1623 | if (!IS_ERR(t)) { |
1da177e4 | 1624 | err = 0; |
c12b395a | 1625 | ip6_tnl_parm_to_user(&p, &t->parms); |
1626 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1627 | err = -EFAULT; |
1628 | ||
37355565 ND |
1629 | } else { |
1630 | err = PTR_ERR(t); | |
1631 | } | |
1da177e4 LT |
1632 | break; |
1633 | case SIOCDELTUNNEL: | |
1634 | err = -EPERM; | |
af31f412 | 1635 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1636 | break; |
1637 | ||
15820e12 | 1638 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1639 | err = -EFAULT; |
67ba4152 | 1640 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1641 | break; |
567131a7 | 1642 | err = -ENOENT; |
c12b395a | 1643 | ip6_tnl_parm_from_user(&p1, &p); |
1644 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1645 | if (IS_ERR(t)) |
1da177e4 | 1646 | break; |
567131a7 | 1647 | err = -EPERM; |
15820e12 | 1648 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1649 | break; |
567131a7 | 1650 | dev = t->dev; |
1da177e4 | 1651 | } |
22f8cde5 SH |
1652 | err = 0; |
1653 | unregister_netdevice(dev); | |
1da177e4 LT |
1654 | break; |
1655 | default: | |
1656 | err = -EINVAL; | |
1657 | } | |
1658 | return err; | |
1659 | } | |
1660 | ||
1da177e4 | 1661 | /** |
3144581c | 1662 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1663 | * @dev: virtual device associated with tunnel |
1664 | * @new_mtu: the new mtu | |
1665 | * | |
1666 | * Return: | |
1667 | * 0 on success, | |
1668 | * %-EINVAL if mtu too small | |
1669 | **/ | |
1670 | ||
79ecb90e | 1671 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1672 | { |
582442d6 OG |
1673 | struct ip6_tnl *tnl = netdev_priv(dev); |
1674 | ||
1675 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
b96f9afe | 1676 | if (new_mtu < ETH_MIN_MTU) |
582442d6 OG |
1677 | return -EINVAL; |
1678 | } else { | |
1679 | if (new_mtu < IPV6_MIN_MTU) | |
1680 | return -EINVAL; | |
1da177e4 | 1681 | } |
582442d6 OG |
1682 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1683 | return -EINVAL; | |
1da177e4 LT |
1684 | dev->mtu = new_mtu; |
1685 | return 0; | |
1686 | } | |
79ecb90e | 1687 | EXPORT_SYMBOL(ip6_tnl_change_mtu); |
1da177e4 | 1688 | |
ecf2c06a ND |
1689 | int ip6_tnl_get_iflink(const struct net_device *dev) |
1690 | { | |
1691 | struct ip6_tnl *t = netdev_priv(dev); | |
1692 | ||
1693 | return t->parms.link; | |
1694 | } | |
1695 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1326c3d5 | 1696 | |
058214a4 TH |
1697 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, |
1698 | unsigned int num) | |
1699 | { | |
1700 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1701 | return -ERANGE; | |
1702 | ||
1703 | return !cmpxchg((const struct ip6_tnl_encap_ops **) | |
1704 | &ip6tun_encaps[num], | |
1705 | NULL, ops) ? 0 : -1; | |
1706 | } | |
1707 | EXPORT_SYMBOL(ip6_tnl_encap_add_ops); | |
1708 | ||
1709 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, | |
1710 | unsigned int num) | |
1711 | { | |
1712 | int ret; | |
1713 | ||
1714 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1715 | return -ERANGE; | |
1716 | ||
1717 | ret = (cmpxchg((const struct ip6_tnl_encap_ops **) | |
1718 | &ip6tun_encaps[num], | |
1719 | ops, NULL) == ops) ? 0 : -1; | |
1720 | ||
1721 | synchronize_net(); | |
1722 | ||
1723 | return ret; | |
1724 | } | |
1725 | EXPORT_SYMBOL(ip6_tnl_encap_del_ops); | |
1726 | ||
1727 | int ip6_tnl_encap_setup(struct ip6_tnl *t, | |
1728 | struct ip_tunnel_encap *ipencap) | |
1729 | { | |
1730 | int hlen; | |
1731 | ||
1732 | memset(&t->encap, 0, sizeof(t->encap)); | |
1733 | ||
1734 | hlen = ip6_encap_hlen(ipencap); | |
1735 | if (hlen < 0) | |
1736 | return hlen; | |
1737 | ||
1738 | t->encap.type = ipencap->type; | |
1739 | t->encap.sport = ipencap->sport; | |
1740 | t->encap.dport = ipencap->dport; | |
1741 | t->encap.flags = ipencap->flags; | |
1742 | ||
1743 | t->encap_hlen = hlen; | |
1744 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); | |
1749 | ||
1326c3d5 | 1750 | static const struct net_device_ops ip6_tnl_netdev_ops = { |
6c6151da | 1751 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1752 | .ndo_uninit = ip6_tnl_dev_uninit, |
8eb30be0 | 1753 | .ndo_start_xmit = ip6_tnl_start_xmit, |
8560f226 | 1754 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1755 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1756 | .ndo_get_stats = ip6_get_stats, |
ecf2c06a | 1757 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1326c3d5 SH |
1758 | }; |
1759 | ||
51c052d4 TH |
1760 | #define IPXIPX_FEATURES (NETIF_F_SG | \ |
1761 | NETIF_F_FRAGLIST | \ | |
1762 | NETIF_F_HIGHDMA | \ | |
1763 | NETIF_F_GSO_SOFTWARE | \ | |
1764 | NETIF_F_HW_CSUM) | |
8560f226 | 1765 | |
1da177e4 | 1766 | /** |
3144581c | 1767 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1768 | * @dev: virtual device associated with tunnel |
1769 | * | |
1770 | * Description: | |
1771 | * Initialize function pointers and device parameters | |
1772 | **/ | |
1773 | ||
3144581c | 1774 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1775 | { |
1326c3d5 | 1776 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1777 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1778 | |
1779 | dev->type = ARPHRD_TUNNEL6; | |
1da177e4 LT |
1780 | dev->flags |= IFF_NOARP; |
1781 | dev->addr_len = sizeof(struct in6_addr); | |
058214a4 | 1782 | dev->features |= NETIF_F_LLTX; |
02875878 | 1783 | netif_keep_dst(dev); |
51c052d4 TH |
1784 | |
1785 | dev->features |= IPXIPX_FEATURES; | |
1786 | dev->hw_features |= IPXIPX_FEATURES; | |
1787 | ||
e837735e ND |
1788 | /* This perm addr will be used as interface identifier by IPv6 */ |
1789 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1790 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1791 | } |
1792 | ||
1793 | ||
1794 | /** | |
3144581c | 1795 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1796 | * @dev: virtual device associated with tunnel |
1797 | **/ | |
1798 | ||
8560f226 | 1799 | static inline int |
3144581c | 1800 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1801 | { |
2941a486 | 1802 | struct ip6_tnl *t = netdev_priv(dev); |
cdf3464e | 1803 | int ret; |
058214a4 | 1804 | int t_hlen; |
8560f226 | 1805 | |
1da177e4 | 1806 | t->dev = dev; |
0bd87628 | 1807 | t->net = dev_net(dev); |
1c213bd2 | 1808 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1809 | if (!dev->tstats) |
1810 | return -ENOMEM; | |
cdf3464e | 1811 | |
607f725f | 1812 | ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); |
0d3c703a TH |
1813 | if (ret) |
1814 | goto free_stats; | |
1815 | ||
1816 | ret = gro_cells_init(&t->gro_cells, dev); | |
1817 | if (ret) | |
1818 | goto destroy_dst; | |
cdf3464e | 1819 | |
79ecb90e | 1820 | t->tun_hlen = 0; |
058214a4 TH |
1821 | t->hlen = t->encap_hlen + t->tun_hlen; |
1822 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1823 | ||
1824 | dev->type = ARPHRD_TUNNEL6; | |
1825 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; | |
1826 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
1827 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1828 | dev->mtu -= 8; | |
b96f9afe JW |
1829 | dev->min_mtu = ETH_MIN_MTU; |
1830 | dev->max_mtu = 0xFFF8 - dev->hard_header_len; | |
79ecb90e | 1831 | |
8560f226 | 1832 | return 0; |
0d3c703a TH |
1833 | |
1834 | destroy_dst: | |
1835 | dst_cache_destroy(&t->dst_cache); | |
1836 | free_stats: | |
1837 | free_percpu(dev->tstats); | |
1838 | dev->tstats = NULL; | |
1839 | ||
1840 | return ret; | |
1da177e4 LT |
1841 | } |
1842 | ||
1843 | /** | |
3144581c | 1844 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1845 | * @dev: virtual device associated with tunnel |
1846 | **/ | |
1847 | ||
8560f226 | 1848 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1849 | { |
2941a486 | 1850 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1851 | int err = ip6_tnl_dev_init_gen(dev); |
1852 | ||
1853 | if (err) | |
1854 | return err; | |
3144581c | 1855 | ip6_tnl_link_config(t); |
8d79266b AS |
1856 | if (t->parms.collect_md) { |
1857 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1858 | netif_keep_dst(dev); | |
1859 | } | |
8560f226 | 1860 | return 0; |
1da177e4 LT |
1861 | } |
1862 | ||
1863 | /** | |
3144581c | 1864 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1865 | * @dev: fallback device |
1866 | * | |
1867 | * Return: 0 | |
1868 | **/ | |
1869 | ||
8560f226 | 1870 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1871 | { |
2941a486 | 1872 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1873 | struct net *net = dev_net(dev); |
1874 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1875 | ||
502b0935 | 1876 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1877 | dev_hold(dev); |
d0087b29 | 1878 | |
cf778b00 | 1879 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1880 | return 0; |
1da177e4 LT |
1881 | } |
1882 | ||
0b112457 ND |
1883 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1884 | { | |
1885 | u8 proto; | |
1886 | ||
c8965932 | 1887 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1888 | return 0; |
1889 | ||
1890 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1891 | if (proto != IPPROTO_IPV6 && | |
1892 | proto != IPPROTO_IPIP && | |
1893 | proto != 0) | |
1894 | return -EINVAL; | |
1895 | ||
1896 | return 0; | |
1897 | } | |
1898 | ||
1899 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1900 | struct __ip6_tnl_parm *parms) | |
1901 | { | |
1902 | memset(parms, 0, sizeof(*parms)); | |
1903 | ||
1904 | if (!data) | |
1905 | return; | |
1906 | ||
1907 | if (data[IFLA_IPTUN_LINK]) | |
1908 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1909 | ||
1910 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 1911 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
0b112457 ND |
1912 | |
1913 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 1914 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
0b112457 ND |
1915 | |
1916 | if (data[IFLA_IPTUN_TTL]) | |
1917 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1918 | ||
1919 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1920 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1921 | ||
1922 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1923 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1924 | |
1925 | if (data[IFLA_IPTUN_FLAGS]) | |
1926 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1927 | ||
1928 | if (data[IFLA_IPTUN_PROTO]) | |
1929 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
8d79266b AS |
1930 | |
1931 | if (data[IFLA_IPTUN_COLLECT_METADATA]) | |
1932 | parms->collect_md = true; | |
0a473b82 CG |
1933 | |
1934 | if (data[IFLA_IPTUN_FWMARK]) | |
1935 | parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
0b112457 ND |
1936 | } |
1937 | ||
b3a27b51 TH |
1938 | static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], |
1939 | struct ip_tunnel_encap *ipencap) | |
1940 | { | |
1941 | bool ret = false; | |
1942 | ||
1943 | memset(ipencap, 0, sizeof(*ipencap)); | |
1944 | ||
1945 | if (!data) | |
1946 | return ret; | |
1947 | ||
1948 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1949 | ret = true; | |
1950 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1951 | } | |
1952 | ||
1953 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1954 | ret = true; | |
1955 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1956 | } | |
1957 | ||
1958 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1959 | ret = true; | |
1960 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); | |
1961 | } | |
1962 | ||
1963 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1964 | ret = true; | |
1965 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); | |
1966 | } | |
1967 | ||
1968 | return ret; | |
1969 | } | |
1970 | ||
0b112457 ND |
1971 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, |
1972 | struct nlattr *tb[], struct nlattr *data[]) | |
1973 | { | |
1974 | struct net *net = dev_net(dev); | |
8d79266b | 1975 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
37355565 | 1976 | struct ip6_tnl *nt, *t; |
b3a27b51 | 1977 | struct ip_tunnel_encap ipencap; |
0b112457 ND |
1978 | |
1979 | nt = netdev_priv(dev); | |
b3a27b51 TH |
1980 | |
1981 | if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { | |
1982 | int err = ip6_tnl_encap_setup(nt, &ipencap); | |
1983 | ||
1984 | if (err < 0) | |
1985 | return err; | |
1986 | } | |
1987 | ||
0b112457 ND |
1988 | ip6_tnl_netlink_parms(data, &nt->parms); |
1989 | ||
8d79266b AS |
1990 | if (nt->parms.collect_md) { |
1991 | if (rtnl_dereference(ip6n->collect_md_tun)) | |
1992 | return -EEXIST; | |
1993 | } else { | |
1994 | t = ip6_tnl_locate(net, &nt->parms, 0); | |
1995 | if (!IS_ERR(t)) | |
1996 | return -EEXIST; | |
1997 | } | |
0b112457 ND |
1998 | |
1999 | return ip6_tnl_create2(dev); | |
2000 | } | |
2001 | ||
2002 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
2003 | struct nlattr *data[]) | |
2004 | { | |
0bd87628 | 2005 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 2006 | struct __ip6_tnl_parm p; |
0bd87628 | 2007 | struct net *net = t->net; |
0b112457 | 2008 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
b3a27b51 | 2009 | struct ip_tunnel_encap ipencap; |
0b112457 ND |
2010 | |
2011 | if (dev == ip6n->fb_tnl_dev) | |
2012 | return -EINVAL; | |
2013 | ||
b3a27b51 TH |
2014 | if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { |
2015 | int err = ip6_tnl_encap_setup(t, &ipencap); | |
2016 | ||
2017 | if (err < 0) | |
2018 | return err; | |
2019 | } | |
0b112457 | 2020 | ip6_tnl_netlink_parms(data, &p); |
8d79266b AS |
2021 | if (p.collect_md) |
2022 | return -EINVAL; | |
0b112457 ND |
2023 | |
2024 | t = ip6_tnl_locate(net, &p, 0); | |
37355565 | 2025 | if (!IS_ERR(t)) { |
0b112457 ND |
2026 | if (t->dev != dev) |
2027 | return -EEXIST; | |
2028 | } else | |
2029 | t = netdev_priv(dev); | |
2030 | ||
2031 | return ip6_tnl_update(t, &p); | |
2032 | } | |
2033 | ||
1e9f3d6f ND |
2034 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
2035 | { | |
2036 | struct net *net = dev_net(dev); | |
2037 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
2038 | ||
2039 | if (dev != ip6n->fb_tnl_dev) | |
2040 | unregister_netdevice_queue(dev, head); | |
2041 | } | |
2042 | ||
b58d731a | 2043 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
2044 | { |
2045 | return | |
2046 | /* IFLA_IPTUN_LINK */ | |
2047 | nla_total_size(4) + | |
2048 | /* IFLA_IPTUN_LOCAL */ | |
2049 | nla_total_size(sizeof(struct in6_addr)) + | |
2050 | /* IFLA_IPTUN_REMOTE */ | |
2051 | nla_total_size(sizeof(struct in6_addr)) + | |
2052 | /* IFLA_IPTUN_TTL */ | |
2053 | nla_total_size(1) + | |
2054 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
2055 | nla_total_size(1) + | |
2056 | /* IFLA_IPTUN_FLOWINFO */ | |
2057 | nla_total_size(4) + | |
2058 | /* IFLA_IPTUN_FLAGS */ | |
2059 | nla_total_size(4) + | |
cfa323b6 ND |
2060 | /* IFLA_IPTUN_PROTO */ |
2061 | nla_total_size(1) + | |
b3a27b51 TH |
2062 | /* IFLA_IPTUN_ENCAP_TYPE */ |
2063 | nla_total_size(2) + | |
2064 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
2065 | nla_total_size(2) + | |
2066 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
2067 | nla_total_size(2) + | |
2068 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
2069 | nla_total_size(2) + | |
8d79266b AS |
2070 | /* IFLA_IPTUN_COLLECT_METADATA */ |
2071 | nla_total_size(0) + | |
0a473b82 CG |
2072 | /* IFLA_IPTUN_FWMARK */ |
2073 | nla_total_size(4) + | |
c075b130 ND |
2074 | 0; |
2075 | } | |
2076 | ||
b58d731a | 2077 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
2078 | { |
2079 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
2080 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
2081 | ||
2082 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
2083 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
2084 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
c075b130 ND |
2085 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
2086 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
2087 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 | 2088 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
0a473b82 CG |
2089 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || |
2090 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) | |
c075b130 | 2091 | goto nla_put_failure; |
b3a27b51 | 2092 | |
8d79266b AS |
2093 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || |
2094 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || | |
2095 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || | |
2096 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) | |
b3a27b51 TH |
2097 | goto nla_put_failure; |
2098 | ||
8d79266b AS |
2099 | if (parm->collect_md) |
2100 | if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) | |
2101 | goto nla_put_failure; | |
0a473b82 | 2102 | |
c075b130 ND |
2103 | return 0; |
2104 | ||
2105 | nla_put_failure: | |
2106 | return -EMSGSIZE; | |
2107 | } | |
2108 | ||
1728d4fa ND |
2109 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
2110 | { | |
2111 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
2112 | ||
2113 | return tunnel->net; | |
2114 | } | |
2115 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
2116 | ||
0b112457 ND |
2117 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
2118 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
2119 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
2120 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
2121 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
2122 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
2123 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
2124 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
2125 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
b3a27b51 TH |
2126 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
2127 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
2128 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
2129 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
8d79266b | 2130 | [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, |
0a473b82 | 2131 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
0b112457 ND |
2132 | }; |
2133 | ||
c075b130 ND |
2134 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
2135 | .kind = "ip6tnl", | |
2136 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 2137 | .policy = ip6_tnl_policy, |
c075b130 | 2138 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
2139 | .setup = ip6_tnl_dev_setup, |
2140 | .validate = ip6_tnl_validate, | |
2141 | .newlink = ip6_tnl_newlink, | |
2142 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 2143 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
2144 | .get_size = ip6_tnl_get_size, |
2145 | .fill_info = ip6_tnl_fill_info, | |
1728d4fa | 2146 | .get_link_net = ip6_tnl_get_link_net, |
c075b130 ND |
2147 | }; |
2148 | ||
3ff2cfa5 | 2149 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
2150 | .handler = ip4ip6_rcv, |
2151 | .err_handler = ip4ip6_err, | |
2152 | .priority = 1, | |
2153 | }; | |
2154 | ||
3ff2cfa5 | 2155 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
2156 | .handler = ip6ip6_rcv, |
2157 | .err_handler = ip6ip6_err, | |
d2acc347 | 2158 | .priority = 1, |
1da177e4 LT |
2159 | }; |
2160 | ||
1e9f3d6f | 2161 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 2162 | { |
1e9f3d6f | 2163 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 2164 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
2165 | int h; |
2166 | struct ip6_tnl *t; | |
cf4432f5 | 2167 | LIST_HEAD(list); |
3e6c9fb5 | 2168 | |
0bd87628 ND |
2169 | for_each_netdev_safe(net, dev, aux) |
2170 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
2171 | unregister_netdevice_queue(dev, &list); | |
2172 | ||
e87a8f24 | 2173 | for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { |
94767632 | 2174 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 2175 | while (t) { |
0bd87628 ND |
2176 | /* If dev is in the same netns, it has already |
2177 | * been added to the list by the previous loop. | |
2178 | */ | |
2179 | if (!net_eq(dev_net(t->dev), net)) | |
2180 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 2181 | t = rtnl_dereference(t->next); |
cf4432f5 | 2182 | } |
3e6c9fb5 PE |
2183 | } |
2184 | ||
cf4432f5 | 2185 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
2186 | } |
2187 | ||
2c8c1e72 | 2188 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 2189 | { |
ac31cd3c | 2190 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 2191 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 2192 | int err; |
13eeb8e9 | 2193 | |
3e6c9fb5 PE |
2194 | ip6n->tnls[0] = ip6n->tnls_wc; |
2195 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
2196 | ||
15820e12 PE |
2197 | err = -ENOMEM; |
2198 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 2199 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
2200 | |
2201 | if (!ip6n->fb_tnl_dev) | |
2202 | goto err_alloc_dev; | |
be77e593 | 2203 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 2204 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
2205 | /* FB netdevice is special: we have one, and only one per netns. |
2206 | * Allowing to move it to another netns is clearly unsafe. | |
2207 | */ | |
2208 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 2209 | |
8560f226 ED |
2210 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
2211 | if (err < 0) | |
2212 | goto err_register; | |
15820e12 PE |
2213 | |
2214 | err = register_netdev(ip6n->fb_tnl_dev); | |
2215 | if (err < 0) | |
2216 | goto err_register; | |
731abb9c JB |
2217 | |
2218 | t = netdev_priv(ip6n->fb_tnl_dev); | |
2219 | ||
2220 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
2221 | return 0; |
2222 | ||
15820e12 | 2223 | err_register: |
8560f226 | 2224 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 2225 | err_alloc_dev: |
13eeb8e9 PE |
2226 | return err; |
2227 | } | |
2228 | ||
2c8c1e72 | 2229 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 2230 | { |
3e6c9fb5 | 2231 | rtnl_lock(); |
1e9f3d6f | 2232 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 2233 | rtnl_unlock(); |
13eeb8e9 PE |
2234 | } |
2235 | ||
2236 | static struct pernet_operations ip6_tnl_net_ops = { | |
2237 | .init = ip6_tnl_init_net, | |
2238 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
2239 | .id = &ip6_tnl_net_id, |
2240 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
2241 | }; |
2242 | ||
1da177e4 LT |
2243 | /** |
2244 | * ip6_tunnel_init - register protocol and reserve needed resources | |
2245 | * | |
2246 | * Return: 0 on success | |
2247 | **/ | |
2248 | ||
2249 | static int __init ip6_tunnel_init(void) | |
2250 | { | |
2251 | int err; | |
2252 | ||
d5aa407f AD |
2253 | err = register_pernet_device(&ip6_tnl_net_ops); |
2254 | if (err < 0) | |
2255 | goto out_pernet; | |
2256 | ||
2257 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
2258 | if (err < 0) { | |
f3213831 | 2259 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 2260 | goto out_ip4ip6; |
c4d3efaf YK |
2261 | } |
2262 | ||
d5aa407f AD |
2263 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
2264 | if (err < 0) { | |
f3213831 | 2265 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 2266 | goto out_ip6ip6; |
1da177e4 | 2267 | } |
c075b130 ND |
2268 | err = rtnl_link_register(&ip6_link_ops); |
2269 | if (err < 0) | |
2270 | goto rtnl_link_failed; | |
13eeb8e9 | 2271 | |
1da177e4 | 2272 | return 0; |
d5aa407f | 2273 | |
c075b130 ND |
2274 | rtnl_link_failed: |
2275 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 2276 | out_ip6ip6: |
c4d3efaf | 2277 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
2278 | out_ip4ip6: |
2279 | unregister_pernet_device(&ip6_tnl_net_ops); | |
2280 | out_pernet: | |
1da177e4 LT |
2281 | return err; |
2282 | } | |
2283 | ||
2284 | /** | |
2285 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
2286 | **/ | |
2287 | ||
2288 | static void __exit ip6_tunnel_cleanup(void) | |
2289 | { | |
c075b130 | 2290 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 2291 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 2292 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 2293 | |
73d605d1 | 2294 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 2295 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 2296 | |
ac31cd3c | 2297 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | module_init(ip6_tunnel_init); | |
2301 | module_exit(ip6_tunnel_cleanup); |