Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
c4d3efaf | 3 | * IPv6 tunneling device |
1da177e4 LT |
4 | * Linux INET6 implementation |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 8 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 | 9 | * |
1da177e4 | 10 | * Based on: |
c4d3efaf | 11 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
12 | * |
13 | * RFC 2473 | |
1da177e4 LT |
14 | */ |
15 | ||
f3213831 JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
1da177e4 | 18 | #include <linux/module.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/errno.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/sockios.h> | |
c4d3efaf | 23 | #include <linux/icmp.h> |
1da177e4 LT |
24 | #include <linux/if.h> |
25 | #include <linux/in.h> | |
26 | #include <linux/ip.h> | |
1da177e4 LT |
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> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
ddbe5032 | 37 | #include <linux/hash.h> |
e837735e | 38 | #include <linux/etherdevice.h> |
1da177e4 | 39 | |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
60063497 | 41 | #include <linux/atomic.h> |
1da177e4 | 42 | |
c4d3efaf | 43 | #include <net/icmp.h> |
1da177e4 | 44 | #include <net/ip.h> |
c5441932 | 45 | #include <net/ip_tunnels.h> |
1da177e4 | 46 | #include <net/ipv6.h> |
1da177e4 LT |
47 | #include <net/ip6_route.h> |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip6_tunnel.h> | |
50 | #include <net/xfrm.h> | |
51 | #include <net/dsfield.h> | |
52 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
53 | #include <net/net_namespace.h> |
54 | #include <net/netns/generic.h> | |
8d79266b | 55 | #include <net/dst_metadata.h> |
1da177e4 LT |
56 | |
57 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 58 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 59 | MODULE_LICENSE("GPL"); |
f98f89a0 | 60 | MODULE_ALIAS_RTNL_LINK("ip6tnl"); |
6dfbd87a | 61 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 62 | |
e87a8f24 JK |
63 | #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 |
64 | #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) | |
1da177e4 | 65 | |
f4e0b4c5 ND |
66 | static bool log_ecn_error = true; |
67 | module_param(log_ecn_error, bool, 0644); | |
68 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
69 | ||
ddbe5032 ED |
70 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
71 | { | |
72 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
73 | ||
e87a8f24 | 74 | return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); |
ddbe5032 | 75 | } |
1da177e4 | 76 | |
8560f226 | 77 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 78 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 79 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 80 | |
c7d03a00 | 81 | static unsigned int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 82 | struct ip6_tnl_net { |
15820e12 PE |
83 | /* the IPv6 tunnel fallback device */ |
84 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 85 | /* lists for storing tunnels in use */ |
e87a8f24 | 86 | struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; |
94767632 ED |
87 | struct ip6_tnl __rcu *tnls_wc[1]; |
88 | struct ip6_tnl __rcu **tnls[2]; | |
8d79266b | 89 | struct ip6_tnl __rcu *collect_md_tun; |
13eeb8e9 PE |
90 | }; |
91 | ||
f200e98d VF |
92 | static inline int ip6_tnl_mpls_supported(void) |
93 | { | |
94 | return IS_ENABLED(CONFIG_MPLS); | |
95 | } | |
96 | ||
b51cd7c8 AL |
97 | #define for_each_ip6_tunnel_rcu(start) \ |
98 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
99 | ||
1da177e4 | 100 | /** |
3144581c | 101 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
b51cd7c8 | 102 | * @net: network namespace |
5fdcce21 | 103 | * @link: ifindex of underlying interface |
1ab1457c YH |
104 | * @remote: the address of the tunnel exit-point |
105 | * @local: the address of the tunnel entry-point | |
1da177e4 | 106 | * |
1ab1457c | 107 | * Return: |
1da177e4 | 108 | * tunnel matching given end-points if found, |
1ab1457c | 109 | * else fallback tunnel if its device is up, |
1da177e4 LT |
110 | * else %NULL |
111 | **/ | |
112 | ||
113 | static struct ip6_tnl * | |
5fdcce21 WD |
114 | ip6_tnl_lookup(struct net *net, int link, |
115 | const struct in6_addr *remote, const struct in6_addr *local) | |
1da177e4 | 116 | { |
ddbe5032 | 117 | unsigned int hash = HASH(remote, local); |
5fdcce21 | 118 | struct ip6_tnl *t, *cand = NULL; |
3e6c9fb5 | 119 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
ea3dc960 | 120 | struct in6_addr any; |
1da177e4 | 121 | |
ddbe5032 | 122 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
5fdcce21 WD |
123 | if (!ipv6_addr_equal(local, &t->parms.laddr) || |
124 | !ipv6_addr_equal(remote, &t->parms.raddr) || | |
125 | !(t->dev->flags & IFF_UP)) | |
126 | continue; | |
127 | ||
128 | if (link == t->parms.link) | |
1da177e4 | 129 | return t; |
5fdcce21 WD |
130 | else |
131 | cand = t; | |
1da177e4 | 132 | } |
ea3dc960 SK |
133 | |
134 | memset(&any, 0, sizeof(any)); | |
135 | hash = HASH(&any, local); | |
136 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
5fdcce21 WD |
137 | if (!ipv6_addr_equal(local, &t->parms.laddr) || |
138 | !ipv6_addr_any(&t->parms.raddr) || | |
139 | !(t->dev->flags & IFF_UP)) | |
140 | continue; | |
141 | ||
142 | if (link == t->parms.link) | |
ea3dc960 | 143 | return t; |
5fdcce21 WD |
144 | else if (!cand) |
145 | cand = t; | |
ea3dc960 SK |
146 | } |
147 | ||
148 | hash = HASH(remote, &any); | |
149 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
5fdcce21 WD |
150 | if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
151 | !ipv6_addr_any(&t->parms.laddr) || | |
152 | !(t->dev->flags & IFF_UP)) | |
153 | continue; | |
154 | ||
155 | if (link == t->parms.link) | |
ea3dc960 | 156 | return t; |
5fdcce21 WD |
157 | else if (!cand) |
158 | cand = t; | |
ea3dc960 SK |
159 | } |
160 | ||
5fdcce21 WD |
161 | if (cand) |
162 | return cand; | |
163 | ||
8d79266b | 164 | t = rcu_dereference(ip6n->collect_md_tun); |
6c1cb439 | 165 | if (t && t->dev->flags & IFF_UP) |
8d79266b AS |
166 | return t; |
167 | ||
2922bc8a ED |
168 | t = rcu_dereference(ip6n->tnls_wc[0]); |
169 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
170 | return t; |
171 | ||
172 | return NULL; | |
173 | } | |
174 | ||
175 | /** | |
3144581c | 176 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
2c4de211 | 177 | * @ip6n: the private data for ip6_vti in the netns |
1ab1457c | 178 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
179 | * |
180 | * Description: | |
3144581c | 181 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
182 | * &struct in6_addr entries laddr and raddr in @p. |
183 | * | |
1ab1457c | 184 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
185 | **/ |
186 | ||
94767632 | 187 | static struct ip6_tnl __rcu ** |
c12b395a | 188 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 189 | { |
b71d1d42 ED |
190 | const struct in6_addr *remote = &p->raddr; |
191 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 192 | unsigned int h = 0; |
1da177e4 LT |
193 | int prio = 0; |
194 | ||
195 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
196 | prio = 1; | |
ddbe5032 | 197 | h = HASH(remote, local); |
1da177e4 | 198 | } |
3e6c9fb5 | 199 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
200 | } |
201 | ||
202 | /** | |
3144581c | 203 | * ip6_tnl_link - add tunnel to hash table |
2c4de211 | 204 | * @ip6n: the private data for ip6_vti in the netns |
1da177e4 LT |
205 | * @t: tunnel to be added |
206 | **/ | |
207 | ||
208 | static void | |
2dd02c89 | 209 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 210 | { |
94767632 | 211 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 212 | |
8d79266b AS |
213 | if (t->parms.collect_md) |
214 | rcu_assign_pointer(ip6n->collect_md_tun, t); | |
cf778b00 ED |
215 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
216 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
217 | } |
218 | ||
219 | /** | |
3144581c | 220 | * ip6_tnl_unlink - remove tunnel from hash table |
2c4de211 | 221 | * @ip6n: the private data for ip6_vti in the netns |
1da177e4 LT |
222 | * @t: tunnel to be removed |
223 | **/ | |
224 | ||
225 | static void | |
2dd02c89 | 226 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 227 | { |
94767632 ED |
228 | struct ip6_tnl __rcu **tp; |
229 | struct ip6_tnl *iter; | |
230 | ||
8d79266b AS |
231 | if (t->parms.collect_md) |
232 | rcu_assign_pointer(ip6n->collect_md_tun, NULL); | |
233 | ||
94767632 ED |
234 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); |
235 | (iter = rtnl_dereference(*tp)) != NULL; | |
236 | tp = &iter->next) { | |
237 | if (t == iter) { | |
cf778b00 | 238 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
239 | break; |
240 | } | |
241 | } | |
242 | } | |
243 | ||
8560f226 ED |
244 | static void ip6_dev_free(struct net_device *dev) |
245 | { | |
cdf3464e MKL |
246 | struct ip6_tnl *t = netdev_priv(dev); |
247 | ||
0d3c703a | 248 | gro_cells_destroy(&t->gro_cells); |
607f725f | 249 | dst_cache_destroy(&t->dst_cache); |
8560f226 | 250 | free_percpu(dev->tstats); |
8560f226 ED |
251 | } |
252 | ||
0b112457 ND |
253 | static int ip6_tnl_create2(struct net_device *dev) |
254 | { | |
255 | struct ip6_tnl *t = netdev_priv(dev); | |
256 | struct net *net = dev_net(dev); | |
257 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
258 | int err; | |
259 | ||
b6ee376c | 260 | dev->rtnl_link_ops = &ip6_link_ops; |
0b112457 ND |
261 | err = register_netdevice(dev); |
262 | if (err < 0) | |
263 | goto out; | |
264 | ||
265 | strcpy(t->parms.name, dev->name); | |
0b112457 | 266 | |
0b112457 ND |
267 | ip6_tnl_link(ip6n, t); |
268 | return 0; | |
269 | ||
270 | out: | |
271 | return err; | |
272 | } | |
273 | ||
1da177e4 | 274 | /** |
2c53040f | 275 | * ip6_tnl_create - create a new tunnel |
b51cd7c8 | 276 | * @net: network namespace |
1da177e4 | 277 | * @p: tunnel parameters |
1da177e4 LT |
278 | * |
279 | * Description: | |
280 | * Create tunnel matching given parameters. | |
1ab1457c YH |
281 | * |
282 | * Return: | |
37355565 | 283 | * created tunnel or error pointer |
1da177e4 LT |
284 | **/ |
285 | ||
c12b395a | 286 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
287 | { |
288 | struct net_device *dev; | |
289 | struct ip6_tnl *t; | |
290 | char name[IFNAMSIZ]; | |
db7a65e3 | 291 | int err = -E2BIG; |
1da177e4 | 292 | |
db7a65e3 ED |
293 | if (p->name[0]) { |
294 | if (!dev_valid_name(p->name)) | |
295 | goto failed; | |
7574cc58 | 296 | strscpy(name, p->name, IFNAMSIZ); |
db7a65e3 | 297 | } else { |
34cc7ba6 | 298 | sprintf(name, "ip6tnl%%d"); |
db7a65e3 ED |
299 | } |
300 | err = -ENOMEM; | |
c835a677 TG |
301 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
302 | ip6_tnl_dev_setup); | |
63159f29 | 303 | if (!dev) |
567131a7 | 304 | goto failed; |
1da177e4 | 305 | |
554eb277 PE |
306 | dev_net_set(dev, net); |
307 | ||
2941a486 | 308 | t = netdev_priv(dev); |
1da177e4 | 309 | t->parms = *p; |
0bd87628 | 310 | t->net = dev_net(dev); |
0b112457 | 311 | err = ip6_tnl_create2(dev); |
8560f226 ED |
312 | if (err < 0) |
313 | goto failed_free; | |
1da177e4 | 314 | |
567131a7 | 315 | return t; |
b37d428b PE |
316 | |
317 | failed_free: | |
cf124db5 | 318 | free_netdev(dev); |
567131a7 | 319 | failed: |
37355565 | 320 | return ERR_PTR(err); |
1da177e4 LT |
321 | } |
322 | ||
323 | /** | |
3144581c | 324 | * ip6_tnl_locate - find or create tunnel matching given parameters |
b51cd7c8 | 325 | * @net: network namespace |
1ab1457c | 326 | * @p: tunnel parameters |
1da177e4 LT |
327 | * @create: != 0 if allowed to create new tunnel if no match found |
328 | * | |
329 | * Description: | |
3144581c | 330 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
331 | * based on @parms. If this is unsuccessful, but @create is set a new |
332 | * tunnel device is created and registered for use. | |
333 | * | |
334 | * Return: | |
37355565 | 335 | * matching tunnel or error pointer |
1da177e4 LT |
336 | **/ |
337 | ||
2dd02c89 | 338 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 339 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 340 | { |
b71d1d42 ED |
341 | const struct in6_addr *remote = &p->raddr; |
342 | const struct in6_addr *local = &p->laddr; | |
94767632 | 343 | struct ip6_tnl __rcu **tp; |
1da177e4 | 344 | struct ip6_tnl *t; |
2dd02c89 | 345 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 346 | |
94767632 ED |
347 | for (tp = ip6_tnl_bucket(ip6n, p); |
348 | (t = rtnl_dereference(*tp)) != NULL; | |
349 | tp = &t->next) { | |
1da177e4 | 350 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
5fdcce21 WD |
351 | ipv6_addr_equal(remote, &t->parms.raddr) && |
352 | p->link == t->parms.link) { | |
2b0bb01b | 353 | if (create) |
37355565 | 354 | return ERR_PTR(-EEXIST); |
2b0bb01b | 355 | |
567131a7 | 356 | return t; |
2b0bb01b | 357 | } |
1da177e4 LT |
358 | } |
359 | if (!create) | |
37355565 | 360 | return ERR_PTR(-ENODEV); |
2dd02c89 | 361 | return ip6_tnl_create(net, p); |
1da177e4 LT |
362 | } |
363 | ||
364 | /** | |
3144581c | 365 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 366 | * @dev: the device to be destroyed |
1ab1457c | 367 | * |
1da177e4 | 368 | * Description: |
3144581c | 369 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
370 | **/ |
371 | ||
372 | static void | |
3144581c | 373 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 374 | { |
2941a486 | 375 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 376 | struct net *net = t->net; |
2dd02c89 | 377 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 378 | |
94767632 | 379 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 380 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 381 | else |
2dd02c89 | 382 | ip6_tnl_unlink(ip6n, t); |
607f725f | 383 | dst_cache_reset(&t->dst_cache); |
d62607c3 | 384 | netdev_put(dev, &t->dev_tracker); |
1da177e4 LT |
385 | } |
386 | ||
387 | /** | |
f7b88985 | 388 | * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option |
1da177e4 | 389 | * @skb: received socket buffer |
2c4de211 | 390 | * @raw: the ICMPv6 error message data |
1da177e4 | 391 | * |
1ab1457c YH |
392 | * Return: |
393 | * 0 if none was found, | |
1da177e4 LT |
394 | * else index to encapsulation limit |
395 | **/ | |
396 | ||
c12b395a | 397 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 398 | { |
fbfa743a ED |
399 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; |
400 | unsigned int nhoff = raw - skb->data; | |
401 | unsigned int off = nhoff + sizeof(*ipv6h); | |
402 | u8 next, nexthdr = ipv6h->nexthdr; | |
1da177e4 LT |
403 | |
404 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
1da177e4 | 405 | struct ipv6_opt_hdr *hdr; |
fbfa743a ED |
406 | u16 optlen; |
407 | ||
408 | if (!pskb_may_pull(skb, off + sizeof(*hdr))) | |
1da177e4 LT |
409 | break; |
410 | ||
fbfa743a | 411 | hdr = (struct ipv6_opt_hdr *)(skb->data + off); |
1da177e4 LT |
412 | if (nexthdr == NEXTHDR_FRAGMENT) { |
413 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
414 | if (frag_hdr->frag_off) | |
415 | break; | |
416 | optlen = 8; | |
417 | } else if (nexthdr == NEXTHDR_AUTH) { | |
416e8126 | 418 | optlen = ipv6_authlen(hdr); |
1da177e4 LT |
419 | } else { |
420 | optlen = ipv6_optlen(hdr); | |
421 | } | |
fbfa743a ED |
422 | /* cache hdr->nexthdr, since pskb_may_pull() might |
423 | * invalidate hdr | |
424 | */ | |
425 | next = hdr->nexthdr; | |
1da177e4 | 426 | if (nexthdr == NEXTHDR_DEST) { |
fbfa743a ED |
427 | u16 i = 2; |
428 | ||
429 | /* Remember : hdr is no longer valid at this point. */ | |
430 | if (!pskb_may_pull(skb, off + optlen)) | |
431 | break; | |
432 | ||
1da177e4 LT |
433 | while (1) { |
434 | struct ipv6_tlv_tnl_enc_lim *tel; | |
435 | ||
436 | /* No more room for encapsulation limit */ | |
fbfa743a | 437 | if (i + sizeof(*tel) > optlen) |
1da177e4 LT |
438 | break; |
439 | ||
63117f09 | 440 | tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); |
1da177e4 LT |
441 | /* return index of option if found and valid */ |
442 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
443 | tel->length == 1) | |
fbfa743a | 444 | return i + off - nhoff; |
1da177e4 LT |
445 | /* else jump to next option */ |
446 | if (tel->type) | |
447 | i += tel->length + 2; | |
448 | else | |
449 | i++; | |
450 | } | |
451 | } | |
fbfa743a | 452 | nexthdr = next; |
1da177e4 LT |
453 | off += optlen; |
454 | } | |
455 | return 0; | |
456 | } | |
c12b395a | 457 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 | 458 | |
2c4de211 XL |
459 | /* ip6_tnl_err() should handle errors in the tunnel according to the |
460 | * specifications in RFC 2473. | |
461 | */ | |
d2acc347 | 462 | static int |
502b0935 | 463 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 464 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 465 | { |
383c1f88 XL |
466 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; |
467 | struct net *net = dev_net(skb->dev); | |
d5fdd6ba BH |
468 | u8 rel_type = ICMPV6_DEST_UNREACH; |
469 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 | 470 | __u32 rel_info = 0; |
383c1f88 | 471 | struct ip6_tnl *t; |
d2acc347 | 472 | int err = -ENOENT; |
383c1f88 XL |
473 | int rel_msg = 0; |
474 | u8 tproto; | |
475 | __u16 len; | |
1da177e4 | 476 | |
1ab1457c YH |
477 | /* If the packet doesn't contain the original IPv6 header we are |
478 | in trouble since we might need the source address for further | |
1da177e4 LT |
479 | processing of the error. */ |
480 | ||
2922bc8a | 481 | rcu_read_lock(); |
5fdcce21 | 482 | t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr); |
63159f29 | 483 | if (!t) |
1da177e4 LT |
484 | goto out; |
485 | ||
6aa7de05 | 486 | tproto = READ_ONCE(t->parms.proto); |
acf722f7 | 487 | if (tproto != ipproto && tproto != 0) |
502b0935 YK |
488 | goto out; |
489 | ||
d2acc347 HX |
490 | err = 0; |
491 | ||
e490d1d8 | 492 | switch (*type) { |
1da177e4 | 493 | case ICMPV6_DEST_UNREACH: |
17a10c92 MB |
494 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
495 | t->parms.name); | |
1da177e4 LT |
496 | rel_msg = 1; |
497 | break; | |
498 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 499 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
17a10c92 MB |
500 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
501 | t->parms.name); | |
1da177e4 LT |
502 | rel_msg = 1; |
503 | } | |
504 | break; | |
46d30cb1 KC |
505 | case ICMPV6_PARAMPROB: { |
506 | struct ipv6_tlv_tnl_enc_lim *tel; | |
507 | __u32 teli; | |
508 | ||
107a5fe6 | 509 | teli = 0; |
e490d1d8 | 510 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 511 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 512 | |
704eae1f | 513 | if (teli && teli == *info - 2) { |
1da177e4 LT |
514 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
515 | if (tel->encap_limit == 0) { | |
17a10c92 MB |
516 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
517 | t->parms.name); | |
1da177e4 LT |
518 | rel_msg = 1; |
519 | } | |
e87cc472 | 520 | } else { |
17a10c92 MB |
521 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
522 | t->parms.name); | |
1da177e4 LT |
523 | } |
524 | break; | |
46d30cb1 KC |
525 | } |
526 | case ICMPV6_PKT_TOOBIG: { | |
527 | __u32 mtu; | |
528 | ||
b00f5432 XL |
529 | ip6_update_pmtu(skb, net, htonl(*info), 0, 0, |
530 | sock_net_uid(net, NULL)); | |
704eae1f | 531 | mtu = *info - offset; |
1da177e4 LT |
532 | if (mtu < IPV6_MIN_MTU) |
533 | mtu = IPV6_MIN_MTU; | |
e5d08d71 IM |
534 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
535 | if (len > mtu) { | |
1da177e4 LT |
536 | rel_type = ICMPV6_PKT_TOOBIG; |
537 | rel_code = 0; | |
538 | rel_info = mtu; | |
539 | rel_msg = 1; | |
540 | } | |
541 | break; | |
46d30cb1 | 542 | } |
383c1f88 XL |
543 | case NDISC_REDIRECT: |
544 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
545 | sock_net_uid(net, NULL)); | |
546 | break; | |
1da177e4 | 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 | 562 | { |
704eae1f | 563 | __u32 rel_info = ntohl(info); |
b71d1d42 | 564 | const struct iphdr *eiph; |
77552cfa XL |
565 | struct sk_buff *skb2; |
566 | int err, rel_msg = 0; | |
567 | u8 rel_type = type; | |
568 | u8 rel_code = code; | |
c4d3efaf | 569 | struct rtable *rt; |
31e4543d | 570 | struct flowi4 fl4; |
c4d3efaf | 571 | |
502b0935 YK |
572 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
573 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
574 | if (err < 0) |
575 | return err; | |
576 | ||
577 | if (rel_msg == 0) | |
578 | return 0; | |
579 | ||
580 | switch (rel_type) { | |
581 | case ICMPV6_DEST_UNREACH: | |
582 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
583 | return 0; | |
584 | rel_type = ICMP_DEST_UNREACH; | |
585 | rel_code = ICMP_HOST_UNREACH; | |
586 | break; | |
587 | case ICMPV6_PKT_TOOBIG: | |
588 | if (rel_code != 0) | |
589 | return 0; | |
590 | rel_type = ICMP_DEST_UNREACH; | |
591 | rel_code = ICMP_FRAG_NEEDED; | |
592 | break; | |
593 | default: | |
594 | return 0; | |
595 | } | |
596 | ||
597 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
598 | return 0; | |
599 | ||
600 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
601 | if (!skb2) | |
602 | return 0; | |
603 | ||
adf30907 ED |
604 | skb_dst_drop(skb2); |
605 | ||
c4d3efaf | 606 | skb_pull(skb2, offset); |
c1d2bbe1 | 607 | skb_reset_network_header(skb2); |
eddc9ec5 | 608 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
609 | |
610 | /* Try to guess incoming interface */ | |
77552cfa XL |
611 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, |
612 | 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 613 | if (IS_ERR(rt)) |
c4d3efaf YK |
614 | goto out; |
615 | ||
d8d1f30b | 616 | skb2->dev = rt->dst.dev; |
77552cfa | 617 | ip_rt_put(rt); |
c4d3efaf YK |
618 | |
619 | /* route "incoming" packet */ | |
620 | if (rt->rt_flags & RTCF_LOCAL) { | |
31e4543d | 621 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
77552cfa XL |
622 | eiph->daddr, eiph->saddr, 0, 0, |
623 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b2e54b09 | 624 | if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) { |
b23dd4fe DM |
625 | if (!IS_ERR(rt)) |
626 | ip_rt_put(rt); | |
c4d3efaf YK |
627 | goto out; |
628 | } | |
b23dd4fe | 629 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf | 630 | } else { |
c4d3efaf YK |
631 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, |
632 | skb2->dev) || | |
b2e54b09 | 633 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6) |
c4d3efaf YK |
634 | goto out; |
635 | } | |
636 | ||
637 | /* change mtu on this route */ | |
638 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 639 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
640 | goto out; |
641 | ||
7a1592bc | 642 | skb_dst_update_pmtu_no_confirm(skb2, rel_info); |
c4d3efaf YK |
643 | } |
644 | ||
704eae1f | 645 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
646 | |
647 | out: | |
648 | kfree_skb(skb2); | |
649 | return 0; | |
650 | } | |
651 | ||
e490d1d8 YK |
652 | static int |
653 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 654 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 | 655 | { |
77552cfa XL |
656 | __u32 rel_info = ntohl(info); |
657 | int err, rel_msg = 0; | |
d5fdd6ba BH |
658 | u8 rel_type = type; |
659 | u8 rel_code = code; | |
e490d1d8 | 660 | |
502b0935 YK |
661 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
662 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
663 | if (err < 0) |
664 | return err; | |
665 | ||
666 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
667 | struct rt6_info *rt; |
668 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 669 | |
1da177e4 | 670 | if (!skb2) |
e490d1d8 | 671 | return 0; |
1da177e4 | 672 | |
adf30907 | 673 | skb_dst_drop(skb2); |
1da177e4 | 674 | skb_pull(skb2, offset); |
c1d2bbe1 | 675 | skb_reset_network_header(skb2); |
1da177e4 LT |
676 | |
677 | /* Try to guess incoming interface */ | |
2f7f54b7 | 678 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
b75cc8f9 | 679 | NULL, 0, skb2, 0); |
1da177e4 | 680 | |
d1918542 DM |
681 | if (rt && rt->dst.dev) |
682 | skb2->dev = rt->dst.dev; | |
1da177e4 | 683 | |
3ffe533c | 684 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 685 | |
94e187c0 | 686 | ip6_rt_put(rt); |
1da177e4 LT |
687 | |
688 | kfree_skb(skb2); | |
689 | } | |
e490d1d8 YK |
690 | |
691 | return 0; | |
1da177e4 LT |
692 | } |
693 | ||
f200e98d VF |
694 | static int |
695 | mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
696 | u8 type, u8 code, int offset, __be32 info) | |
697 | { | |
698 | __u32 rel_info = ntohl(info); | |
699 | int err, rel_msg = 0; | |
700 | u8 rel_type = type; | |
701 | u8 rel_code = code; | |
702 | ||
703 | err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code, | |
704 | &rel_msg, &rel_info, offset); | |
705 | return err; | |
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 | |
f200e98d VF |
730 | static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
731 | const struct ipv6hdr *ipv6h, | |
732 | struct sk_buff *skb) | |
733 | { | |
734 | /* ECN is not supported in AF_MPLS */ | |
735 | return 0; | |
736 | } | |
737 | ||
c12b395a | 738 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
739 | const struct in6_addr *laddr, |
740 | const struct in6_addr *raddr) | |
741 | { | |
c12b395a | 742 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
743 | int ltype = ipv6_addr_type(laddr); |
744 | int rtype = ipv6_addr_type(raddr); | |
745 | __u32 flags = 0; | |
746 | ||
747 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
748 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
749 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
750 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
751 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
752 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
753 | if (ltype&IPV6_ADDR_UNICAST) | |
754 | flags |= IP6_TNL_F_CAP_XMIT; | |
755 | if (rtype&IPV6_ADDR_UNICAST) | |
756 | flags |= IP6_TNL_F_CAP_RCV; | |
757 | } | |
758 | return flags; | |
759 | } | |
c12b395a | 760 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 761 | |
f1a28eab | 762 | /* called with rcu_read_lock() */ |
c12b395a | 763 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
764 | const struct in6_addr *laddr, |
765 | const struct in6_addr *raddr) | |
09c6bbf0 | 766 | { |
c12b395a | 767 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 768 | int ret = 0; |
0bd87628 | 769 | struct net *net = t->net; |
09c6bbf0 | 770 | |
d0087b29 VN |
771 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
772 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
773 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 774 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
775 | |
776 | if (p->link) | |
f1a28eab | 777 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 778 | |
d0087b29 | 779 | if ((ipv6_addr_is_multicast(laddr) || |
232378e8 DA |
780 | likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false, |
781 | 0, IFA_F_TENTATIVE))) && | |
908d140a | 782 | ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || |
232378e8 DA |
783 | likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true, |
784 | 0, IFA_F_TENTATIVE)))) | |
09c6bbf0 | 785 | ret = 1; |
09c6bbf0 VN |
786 | } |
787 | return ret; | |
788 | } | |
c12b395a | 789 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 | 790 | |
0d3c703a TH |
791 | static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, |
792 | const struct tnl_ptk_info *tpi, | |
793 | struct metadata_dst *tun_dst, | |
794 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
795 | const struct ipv6hdr *ipv6h, | |
796 | struct sk_buff *skb), | |
797 | bool log_ecn_err) | |
1da177e4 | 798 | { |
b71d1d42 | 799 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 800 | int err; |
1da177e4 | 801 | |
0d3c703a TH |
802 | if ((!(tpi->flags & TUNNEL_CSUM) && |
803 | (tunnel->parms.i_flags & TUNNEL_CSUM)) || | |
804 | ((tpi->flags & TUNNEL_CSUM) && | |
805 | !(tunnel->parms.i_flags & TUNNEL_CSUM))) { | |
2fad1ba3 ED |
806 | DEV_STATS_INC(tunnel->dev, rx_crc_errors); |
807 | DEV_STATS_INC(tunnel->dev, rx_errors); | |
0d3c703a TH |
808 | goto drop; |
809 | } | |
8560f226 | 810 | |
0d3c703a TH |
811 | if (tunnel->parms.i_flags & TUNNEL_SEQ) { |
812 | if (!(tpi->flags & TUNNEL_SEQ) || | |
813 | (tunnel->i_seqno && | |
814 | (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
2fad1ba3 ED |
815 | DEV_STATS_INC(tunnel->dev, rx_fifo_errors); |
816 | DEV_STATS_INC(tunnel->dev, rx_errors); | |
0d3c703a | 817 | goto drop; |
502b0935 | 818 | } |
0d3c703a TH |
819 | tunnel->i_seqno = ntohl(tpi->seq) + 1; |
820 | } | |
502b0935 | 821 | |
0d3c703a | 822 | skb->protocol = tpi->proto; |
1da177e4 | 823 | |
0d3c703a TH |
824 | /* Warning: All skb pointers will be invalidated! */ |
825 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
826 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
2fad1ba3 ED |
827 | DEV_STATS_INC(tunnel->dev, rx_length_errors); |
828 | DEV_STATS_INC(tunnel->dev, rx_errors); | |
0d3c703a | 829 | goto drop; |
1da177e4 | 830 | } |
0d3c703a TH |
831 | |
832 | ipv6h = ipv6_hdr(skb); | |
833 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
834 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
835 | } else { | |
836 | skb->dev = tunnel->dev; | |
da5a2e49 | 837 | skb_reset_mac_header(skb); |
0d3c703a TH |
838 | } |
839 | ||
840 | skb_reset_network_header(skb); | |
841 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
842 | ||
843 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); | |
844 | ||
845 | err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); | |
846 | if (unlikely(err)) { | |
847 | if (log_ecn_err) | |
848 | net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", | |
849 | &ipv6h->saddr, | |
850 | ipv6_get_dsfield(ipv6h)); | |
851 | if (err > 1) { | |
2fad1ba3 ED |
852 | DEV_STATS_INC(tunnel->dev, rx_frame_errors); |
853 | DEV_STATS_INC(tunnel->dev, rx_errors); | |
0d3c703a | 854 | goto drop; |
f4e0b4c5 | 855 | } |
0d3c703a | 856 | } |
f4e0b4c5 | 857 | |
afd2051b | 858 | dev_sw_netstats_rx_add(tunnel->dev, skb->len); |
8560f226 | 859 | |
0d3c703a | 860 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
8990f468 | 861 | |
8d79266b AS |
862 | if (tun_dst) |
863 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
864 | ||
0d3c703a TH |
865 | gro_cells_receive(&tunnel->gro_cells, skb); |
866 | return 0; | |
867 | ||
868 | drop: | |
f1925ca5 HY |
869 | if (tun_dst) |
870 | dst_release((struct dst_entry *)tun_dst); | |
0d3c703a TH |
871 | kfree_skb(skb); |
872 | return 0; | |
873 | } | |
874 | ||
875 | int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, | |
876 | const struct tnl_ptk_info *tpi, | |
877 | struct metadata_dst *tun_dst, | |
878 | bool log_ecn_err) | |
879 | { | |
272502fc MT |
880 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
881 | const struct ipv6hdr *ipv6h, | |
882 | struct sk_buff *skb); | |
883 | ||
884 | dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate; | |
885 | if (tpi->proto == htons(ETH_P_IP)) | |
886 | dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate; | |
887 | ||
888 | return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, | |
0d3c703a TH |
889 | log_ecn_err); |
890 | } | |
891 | EXPORT_SYMBOL(ip6_tnl_rcv); | |
892 | ||
893 | static const struct tnl_ptk_info tpi_v6 = { | |
894 | /* no tunnel info required for ipxip6. */ | |
895 | .proto = htons(ETH_P_IPV6), | |
896 | }; | |
897 | ||
898 | static const struct tnl_ptk_info tpi_v4 = { | |
899 | /* no tunnel info required for ipxip6. */ | |
900 | .proto = htons(ETH_P_IP), | |
901 | }; | |
902 | ||
f200e98d VF |
903 | static const struct tnl_ptk_info tpi_mpls = { |
904 | /* no tunnel info required for mplsip6. */ | |
905 | .proto = htons(ETH_P_MPLS_UC), | |
906 | }; | |
907 | ||
0d3c703a TH |
908 | static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, |
909 | const struct tnl_ptk_info *tpi, | |
910 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
911 | const struct ipv6hdr *ipv6h, | |
912 | struct sk_buff *skb)) | |
913 | { | |
914 | struct ip6_tnl *t; | |
915 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
8d79266b | 916 | struct metadata_dst *tun_dst = NULL; |
0d3c703a TH |
917 | int ret = -1; |
918 | ||
919 | rcu_read_lock(); | |
5fdcce21 | 920 | t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr); |
0d3c703a TH |
921 | |
922 | if (t) { | |
6aa7de05 | 923 | u8 tproto = READ_ONCE(t->parms.proto); |
0d3c703a TH |
924 | |
925 | if (tproto != ipproto && tproto != 0) | |
926 | goto drop; | |
927 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
928 | goto drop; | |
cbb49697 | 929 | ipv6h = ipv6_hdr(skb); |
0d3c703a TH |
930 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) |
931 | goto drop; | |
932 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
933 | goto drop; | |
8d79266b AS |
934 | if (t->parms.collect_md) { |
935 | tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); | |
936 | if (!tun_dst) | |
74c4b656 | 937 | goto drop; |
8d79266b AS |
938 | } |
939 | ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, | |
0d3c703a | 940 | log_ecn_error); |
1da177e4 | 941 | } |
0d3c703a | 942 | |
2922bc8a | 943 | rcu_read_unlock(); |
50fba2aa | 944 | |
0d3c703a TH |
945 | return ret; |
946 | ||
947 | drop: | |
948 | rcu_read_unlock(); | |
50fba2aa HX |
949 | kfree_skb(skb); |
950 | return 0; | |
1da177e4 LT |
951 | } |
952 | ||
c4d3efaf YK |
953 | static int ip4ip6_rcv(struct sk_buff *skb) |
954 | { | |
ca4aa976 | 955 | return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, |
0d3c703a | 956 | ip4ip6_dscp_ecn_decapsulate); |
c4d3efaf YK |
957 | } |
958 | ||
8359925b YK |
959 | static int ip6ip6_rcv(struct sk_buff *skb) |
960 | { | |
0d3c703a TH |
961 | return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, |
962 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
963 | } |
964 | ||
f200e98d VF |
965 | static int mplsip6_rcv(struct sk_buff *skb) |
966 | { | |
967 | return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls, | |
968 | mplsip6_dscp_ecn_decapsulate); | |
969 | } | |
970 | ||
6fb32dde VN |
971 | struct ipv6_tel_txoption { |
972 | struct ipv6_txoptions ops; | |
973 | __u8 dst_opt[8]; | |
974 | }; | |
1da177e4 | 975 | |
6fb32dde VN |
976 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
977 | { | |
978 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 979 | |
6fb32dde VN |
980 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
981 | opt->dst_opt[3] = 1; | |
982 | opt->dst_opt[4] = encap_limit; | |
983 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
984 | opt->dst_opt[6] = 1; | |
1da177e4 | 985 | |
89a23c8b | 986 | opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
6fb32dde | 987 | opt->ops.opt_nflen = 8; |
1da177e4 LT |
988 | } |
989 | ||
990 | /** | |
3144581c | 991 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 992 | * @t: the outgoing tunnel device |
1ab1457c | 993 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
994 | * |
995 | * Description: | |
1ab1457c | 996 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
997 | * doesn't match source of incoming packet. |
998 | * | |
1ab1457c | 999 | * Return: |
1da177e4 LT |
1000 | * 1 if conflict, |
1001 | * 0 else | |
1002 | **/ | |
1003 | ||
92113bfd | 1004 | static inline bool |
b71d1d42 | 1005 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
1006 | { |
1007 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
1008 | } | |
1009 | ||
d5005140 SK |
1010 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
1011 | const struct in6_addr *laddr, | |
1012 | const struct in6_addr *raddr) | |
09c6bbf0 | 1013 | { |
c12b395a | 1014 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 1015 | int ret = 0; |
0bd87628 | 1016 | struct net *net = t->net; |
09c6bbf0 | 1017 | |
6712abc1 WT |
1018 | if (t->parms.collect_md) |
1019 | return 1; | |
1020 | ||
d5005140 SK |
1021 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
1022 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
1023 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
1024 | struct net_device *ldev = NULL; |
1025 | ||
f1a28eab | 1026 | rcu_read_lock(); |
09c6bbf0 | 1027 | if (p->link) |
f1a28eab | 1028 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 1029 | |
232378e8 DA |
1030 | if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false, |
1031 | 0, IFA_F_TENTATIVE))) | |
6cee105e IS |
1032 | pr_warn_ratelimited("%s xmit: Local address not yet configured!\n", |
1033 | p->name); | |
908d140a SL |
1034 | else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && |
1035 | !ipv6_addr_is_multicast(raddr) && | |
232378e8 DA |
1036 | unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev, |
1037 | true, 0, IFA_F_TENTATIVE))) | |
6cee105e IS |
1038 | pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n", |
1039 | p->name); | |
09c6bbf0 VN |
1040 | else |
1041 | ret = 1; | |
f1a28eab | 1042 | rcu_read_unlock(); |
09c6bbf0 VN |
1043 | } |
1044 | return ret; | |
1045 | } | |
c12b395a | 1046 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
1047 | ||
1da177e4 | 1048 | /** |
8eb30be0 | 1049 | * ip6_tnl_xmit - encapsulate packet and send |
1da177e4 | 1050 | * @skb: the outgoing socket buffer |
1ab1457c | 1051 | * @dev: the outgoing tunnel device |
61ec2aec | 1052 | * @dsfield: dscp code for outer header |
8eb30be0 | 1053 | * @fl6: flow of tunneled packet |
61ec2aec YK |
1054 | * @encap_limit: encapsulation limit |
1055 | * @pmtu: Path MTU is stored if packet is too big | |
8eb30be0 | 1056 | * @proto: next header value |
1da177e4 LT |
1057 | * |
1058 | * Description: | |
1059 | * Build new header and do some sanity checks on the packet before sending | |
1060 | * it. | |
1061 | * | |
1ab1457c | 1062 | * Return: |
c4d3efaf | 1063 | * 0 on success |
61ec2aec YK |
1064 | * -1 fail |
1065 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
1066 | **/ |
1067 | ||
8eb30be0 TH |
1068 | int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, |
1069 | struct flowi6 *fl6, int encap_limit, __u32 *pmtu, | |
1070 | __u8 proto) | |
1da177e4 | 1071 | { |
2941a486 | 1072 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 1073 | struct net *net = t->net; |
199ab00f | 1074 | struct ipv6hdr *ipv6h; |
6fb32dde | 1075 | struct ipv6_tel_txoption opt; |
d24f22f3 | 1076 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
1077 | struct net_device *tdev; |
1078 | int mtu; | |
d41bb33b | 1079 | unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; |
058214a4 TH |
1080 | unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; |
1081 | unsigned int max_headroom = psh_hlen; | |
b09ab9c9 | 1082 | __be16 payload_protocol; |
b5c2d495 | 1083 | bool use_cache = false; |
8d79266b | 1084 | u8 hop_limit; |
61ec2aec | 1085 | int err = -1; |
1da177e4 | 1086 | |
b09ab9c9 MM |
1087 | payload_protocol = skb_protocol(skb, true); |
1088 | ||
8d79266b AS |
1089 | if (t->parms.collect_md) { |
1090 | hop_limit = skb_tunnel_info(skb)->key.ttl; | |
1091 | goto route_lookup; | |
1092 | } else { | |
1093 | hop_limit = t->parms.hop_limit; | |
1094 | } | |
1095 | ||
ea3dc960 SK |
1096 | /* NBMA tunnel */ |
1097 | if (ipv6_addr_any(&t->parms.raddr)) { | |
b09ab9c9 | 1098 | if (payload_protocol == htons(ETH_P_IPV6)) { |
199ab00f WC |
1099 | struct in6_addr *addr6; |
1100 | struct neighbour *neigh; | |
1101 | int addr_type; | |
ea3dc960 | 1102 | |
199ab00f WC |
1103 | if (!skb_dst(skb)) |
1104 | goto tx_err_link_failure; | |
ea3dc960 | 1105 | |
199ab00f WC |
1106 | neigh = dst_neigh_lookup(skb_dst(skb), |
1107 | &ipv6_hdr(skb)->daddr); | |
1108 | if (!neigh) | |
1109 | goto tx_err_link_failure; | |
ea3dc960 | 1110 | |
199ab00f WC |
1111 | addr6 = (struct in6_addr *)&neigh->primary_key; |
1112 | addr_type = ipv6_addr_type(addr6); | |
ea3dc960 | 1113 | |
199ab00f WC |
1114 | if (addr_type == IPV6_ADDR_ANY) |
1115 | addr6 = &ipv6_hdr(skb)->daddr; | |
ea3dc960 | 1116 | |
199ab00f WC |
1117 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); |
1118 | neigh_release(neigh); | |
b09ab9c9 | 1119 | } else if (payload_protocol == htons(ETH_P_IP)) { |
3a5f238f ED |
1120 | const struct rtable *rt = skb_rtable(skb); |
1121 | ||
1122 | if (!rt) | |
1123 | goto tx_err_link_failure; | |
c1f55c5e QD |
1124 | |
1125 | if (rt->rt_gw_family == AF_INET6) | |
1126 | memcpy(&fl6->daddr, &rt->rt_gw6, sizeof(fl6->daddr)); | |
199ab00f | 1127 | } |
23263ec8 EC |
1128 | } else if (t->parms.proto != 0 && !(t->parms.flags & |
1129 | (IP6_TNL_F_USE_ORIG_TCLASS | | |
1130 | IP6_TNL_F_USE_ORIG_FWMARK))) { | |
1131 | /* enable the cache only if neither the outer protocol nor the | |
1132 | * routing decision depends on the current inner header value | |
b5c2d495 PA |
1133 | */ |
1134 | use_cache = true; | |
1135 | } | |
1136 | ||
1137 | if (use_cache) | |
607f725f | 1138 | dst = dst_cache_get(&t->dst_cache); |
d5005140 SK |
1139 | |
1140 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1141 | goto tx_err_link_failure; | |
1142 | ||
89b02126 | 1143 | if (!dst) { |
8d79266b | 1144 | route_lookup: |
5f733ee6 LM |
1145 | /* add dsfield to flowlabel for route lookup */ |
1146 | fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); | |
1147 | ||
cdf3464e | 1148 | dst = ip6_route_output(net, NULL, fl6); |
1da177e4 | 1149 | |
cdf3464e | 1150 | if (dst->error) |
a57ebc90 | 1151 | goto tx_err_link_failure; |
cdf3464e MKL |
1152 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
1153 | if (IS_ERR(dst)) { | |
1154 | err = PTR_ERR(dst); | |
1155 | dst = NULL; | |
452edd59 DM |
1156 | goto tx_err_link_failure; |
1157 | } | |
3789caba | 1158 | if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) && |
8d79266b AS |
1159 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
1160 | &fl6->daddr, 0, &fl6->saddr)) | |
1161 | goto tx_err_link_failure; | |
cdf3464e | 1162 | ndst = dst; |
a57ebc90 | 1163 | } |
1da177e4 LT |
1164 | |
1165 | tdev = dst->dev; | |
1166 | ||
1167 | if (tdev == dev) { | |
2fad1ba3 | 1168 | DEV_STATS_INC(dev, collisions); |
e87cc472 JP |
1169 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1170 | t->parms.name); | |
1da177e4 LT |
1171 | goto tx_err_dst_release; |
1172 | } | |
d41bb33b | 1173 | mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; |
6fb32dde | 1174 | if (encap_limit >= 0) { |
1da177e4 LT |
1175 | max_headroom += 8; |
1176 | mtu -= 8; | |
1177 | } | |
82a40777 XL |
1178 | mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ? |
1179 | IPV6_MIN_MTU : IPV4_MIN_MTU); | |
c9fefa08 | 1180 | |
7a1592bc | 1181 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
d41bb33b | 1182 | if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { |
61ec2aec YK |
1183 | *pmtu = mtu; |
1184 | err = -EMSGSIZE; | |
1da177e4 LT |
1185 | goto tx_err_dst_release; |
1186 | } | |
1187 | ||
8eb30be0 TH |
1188 | if (t->err_count > 0) { |
1189 | if (time_before(jiffies, | |
1190 | t->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
1191 | t->err_count--; | |
1192 | ||
1193 | dst_link_failure(skb); | |
1194 | } else { | |
1195 | t->err_count = 0; | |
1196 | } | |
1197 | } | |
1198 | ||
963a88b3 | 1199 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1200 | |
1da177e4 LT |
1201 | /* |
1202 | * Okay, now see if we can stuff it in the buffer as-is. | |
1203 | */ | |
1204 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1205 | |
cfbba49d PM |
1206 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1207 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1208 | struct sk_buff *new_skb; |
1ab1457c | 1209 | |
e5d08d71 IM |
1210 | new_skb = skb_realloc_headroom(skb, max_headroom); |
1211 | if (!new_skb) | |
1da177e4 LT |
1212 | goto tx_err_dst_release; |
1213 | ||
1214 | if (skb->sk) | |
1215 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1216 | consume_skb(skb); |
1da177e4 LT |
1217 | skb = new_skb; |
1218 | } | |
cdf3464e | 1219 | |
8d79266b AS |
1220 | if (t->parms.collect_md) { |
1221 | if (t->encap.type != TUNNEL_ENCAP_NONE) | |
1222 | goto tx_err_dst_release; | |
1223 | } else { | |
b5c2d495 | 1224 | if (use_cache && ndst) |
8d79266b AS |
1225 | dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); |
1226 | } | |
cdf3464e MKL |
1227 | skb_dst_set(skb, dst); |
1228 | ||
36feaac3 | 1229 | if (hop_limit == 0) { |
b09ab9c9 | 1230 | if (payload_protocol == htons(ETH_P_IP)) |
36feaac3 | 1231 | hop_limit = ip_hdr(skb)->ttl; |
b09ab9c9 | 1232 | else if (payload_protocol == htons(ETH_P_IPV6)) |
36feaac3 HL |
1233 | hop_limit = ipv6_hdr(skb)->hop_limit; |
1234 | else | |
1235 | hop_limit = ip6_dst_hoplimit(dst); | |
1236 | } | |
3d483058 | 1237 | |
058214a4 TH |
1238 | /* Calculate max headroom for all the headers and adjust |
1239 | * needed_headroom if necessary. | |
1240 | */ | |
8eb30be0 | 1241 | max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) |
058214a4 | 1242 | + dst->header_len + t->hlen; |
4b397c06 ED |
1243 | if (max_headroom > READ_ONCE(dev->needed_headroom)) |
1244 | WRITE_ONCE(dev->needed_headroom, max_headroom); | |
8eb30be0 | 1245 | |
058214a4 TH |
1246 | err = ip6_tnl_encap(skb, t, &proto, fl6); |
1247 | if (err) | |
1248 | return err; | |
1249 | ||
d4d576f5 SB |
1250 | if (encap_limit >= 0) { |
1251 | init_tel_txopt(&opt, encap_limit); | |
1252 | ipv6_push_frag_opts(skb, &opt.ops, &proto); | |
1253 | } | |
1254 | ||
e2d1bca7 ACM |
1255 | skb_push(skb, sizeof(struct ipv6hdr)); |
1256 | skb_reset_network_header(skb); | |
0660e03f | 1257 | ipv6h = ipv6_hdr(skb); |
0e9a7095 | 1258 | ip6_flow_hdr(ipv6h, dsfield, |
42240901 | 1259 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
8d79266b | 1260 | ipv6h->hop_limit = hop_limit; |
1da177e4 | 1261 | ipv6h->nexthdr = proto; |
4e3fd7a0 AD |
1262 | ipv6h->saddr = fl6->saddr; |
1263 | ipv6h->daddr = fl6->daddr; | |
79b16aad | 1264 | ip6tunnel_xmit(NULL, skb, dev); |
1da177e4 LT |
1265 | return 0; |
1266 | tx_err_link_failure: | |
2fad1ba3 | 1267 | DEV_STATS_INC(dev, tx_carrier_errors); |
1da177e4 LT |
1268 | dst_link_failure(skb); |
1269 | tx_err_dst_release: | |
cdf3464e | 1270 | dst_release(dst); |
61ec2aec YK |
1271 | return err; |
1272 | } | |
8eb30be0 | 1273 | EXPORT_SYMBOL(ip6_tnl_xmit); |
61ec2aec | 1274 | |
c4d3efaf | 1275 | static inline int |
e7bb18e6 VF |
1276 | ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, |
1277 | u8 protocol) | |
c4d3efaf YK |
1278 | { |
1279 | struct ip6_tnl *t = netdev_priv(dev); | |
e7bb18e6 | 1280 | struct ipv6hdr *ipv6h; |
76c0ddd8 | 1281 | const struct iphdr *iph; |
c4d3efaf | 1282 | int encap_limit = -1; |
e7bb18e6 | 1283 | __u16 offset; |
4c9483b2 | 1284 | struct flowi6 fl6; |
e7bb18e6 | 1285 | __u8 dsfield, orig_dsfield; |
c4d3efaf | 1286 | __u32 mtu; |
acf722f7 | 1287 | u8 tproto; |
c4d3efaf YK |
1288 | int err; |
1289 | ||
6aa7de05 | 1290 | tproto = READ_ONCE(t->parms.proto); |
e7bb18e6 | 1291 | if (tproto != protocol && tproto != 0) |
c4d3efaf YK |
1292 | return -1; |
1293 | ||
8d79266b AS |
1294 | if (t->parms.collect_md) { |
1295 | struct ip_tunnel_info *tun_info; | |
1296 | const struct ip_tunnel_key *key; | |
c4d3efaf | 1297 | |
8d79266b AS |
1298 | tun_info = skb_tunnel_info(skb); |
1299 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
1300 | ip_tunnel_info_af(tun_info) != AF_INET6)) | |
1301 | return -1; | |
1302 | key = &tun_info->key; | |
1303 | memset(&fl6, 0, sizeof(fl6)); | |
e7bb18e6 | 1304 | fl6.flowi6_proto = protocol; |
3789caba | 1305 | fl6.saddr = key->u.ipv6.src; |
8d79266b AS |
1306 | fl6.daddr = key->u.ipv6.dst; |
1307 | fl6.flowlabel = key->label; | |
46f8cd9d | 1308 | dsfield = key->tos; |
e7bb18e6 VF |
1309 | switch (protocol) { |
1310 | case IPPROTO_IPIP: | |
1311 | iph = ip_hdr(skb); | |
1312 | orig_dsfield = ipv4_get_dsfield(iph); | |
1313 | break; | |
1314 | case IPPROTO_IPV6: | |
1315 | ipv6h = ipv6_hdr(skb); | |
1316 | orig_dsfield = ipv6_get_dsfield(ipv6h); | |
1317 | break; | |
1318 | default: | |
1319 | orig_dsfield = dsfield; | |
1320 | break; | |
1321 | } | |
8d79266b AS |
1322 | } else { |
1323 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1324 | encap_limit = t->parms.encap_limit; | |
e7bb18e6 VF |
1325 | if (protocol == IPPROTO_IPV6) { |
1326 | offset = ip6_tnl_parse_tlv_enc_lim(skb, | |
1327 | skb_network_header(skb)); | |
1328 | /* ip6_tnl_parse_tlv_enc_lim() might have | |
1329 | * reallocated skb->head | |
1330 | */ | |
1331 | if (offset > 0) { | |
1332 | struct ipv6_tlv_tnl_enc_lim *tel; | |
c4d3efaf | 1333 | |
e7bb18e6 VF |
1334 | tel = (void *)&skb_network_header(skb)[offset]; |
1335 | if (tel->encap_limit == 0) { | |
4372339e JD |
1336 | icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, |
1337 | ICMPV6_HDR_FIELD, offset + 2); | |
e7bb18e6 VF |
1338 | return -1; |
1339 | } | |
1340 | encap_limit = tel->encap_limit - 1; | |
8d79266b | 1341 | } |
61ec2aec | 1342 | } |
61ec2aec | 1343 | |
8d79266b | 1344 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
e7bb18e6 | 1345 | fl6.flowi6_proto = protocol; |
61ec2aec | 1346 | |
8d79266b AS |
1347 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1348 | fl6.flowi6_mark = skb->mark; | |
0a473b82 CG |
1349 | else |
1350 | fl6.flowi6_mark = t->parms.fwmark; | |
e7bb18e6 VF |
1351 | switch (protocol) { |
1352 | case IPPROTO_IPIP: | |
1353 | iph = ip_hdr(skb); | |
1354 | orig_dsfield = ipv4_get_dsfield(iph); | |
1355 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
1356 | dsfield = orig_dsfield; | |
1357 | else | |
1358 | dsfield = ip6_tclass(t->parms.flowinfo); | |
1359 | break; | |
1360 | case IPPROTO_IPV6: | |
1361 | ipv6h = ipv6_hdr(skb); | |
1362 | orig_dsfield = ipv6_get_dsfield(ipv6h); | |
1363 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
1364 | dsfield = orig_dsfield; | |
1365 | else | |
1366 | dsfield = ip6_tclass(t->parms.flowinfo); | |
1367 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) | |
1368 | fl6.flowlabel |= ip6_flowlabel(ipv6h); | |
1369 | break; | |
1370 | default: | |
6c11fbf9 | 1371 | orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo); |
e7bb18e6 VF |
1372 | break; |
1373 | } | |
8d79266b | 1374 | } |
61ec2aec | 1375 | |
e2d118a1 | 1376 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
e7bb18e6 | 1377 | dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield); |
e2d118a1 | 1378 | |
815d22e5 TH |
1379 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
1380 | return -1; | |
1381 | ||
a6e3f298 JK |
1382 | skb_set_inner_ipproto(skb, protocol); |
1383 | ||
8eb30be0 | 1384 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
e7bb18e6 | 1385 | protocol); |
61ec2aec | 1386 | if (err != 0) { |
e7bb18e6 | 1387 | /* XXX: send ICMP error even if DF is not set. */ |
61ec2aec | 1388 | if (err == -EMSGSIZE) |
e7bb18e6 VF |
1389 | switch (protocol) { |
1390 | case IPPROTO_IPIP: | |
4372339e JD |
1391 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, |
1392 | ICMP_FRAG_NEEDED, htonl(mtu)); | |
e7bb18e6 VF |
1393 | break; |
1394 | case IPPROTO_IPV6: | |
4372339e | 1395 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
e7bb18e6 VF |
1396 | break; |
1397 | default: | |
1398 | break; | |
1399 | } | |
61ec2aec YK |
1400 | return -1; |
1401 | } | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
6fef4c0c | 1406 | static netdev_tx_t |
8eb30be0 | 1407 | ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) |
61ec2aec YK |
1408 | { |
1409 | struct ip6_tnl *t = netdev_priv(dev); | |
e7bb18e6 | 1410 | u8 ipproto; |
61ec2aec YK |
1411 | int ret; |
1412 | ||
cb9f1b78 WB |
1413 | if (!pskb_inet_may_pull(skb)) |
1414 | goto tx_err; | |
1415 | ||
61ec2aec | 1416 | switch (skb->protocol) { |
60678040 | 1417 | case htons(ETH_P_IP): |
e7bb18e6 | 1418 | ipproto = IPPROTO_IPIP; |
c4d3efaf | 1419 | break; |
60678040 | 1420 | case htons(ETH_P_IPV6): |
e7bb18e6 VF |
1421 | if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb))) |
1422 | goto tx_err; | |
1423 | ipproto = IPPROTO_IPV6; | |
61ec2aec | 1424 | break; |
6c11fbf9 VF |
1425 | case htons(ETH_P_MPLS_UC): |
1426 | ipproto = IPPROTO_MPLS; | |
1427 | break; | |
61ec2aec YK |
1428 | default: |
1429 | goto tx_err; | |
1430 | } | |
1431 | ||
e7bb18e6 | 1432 | ret = ipxip6_tnl_xmit(skb, dev, ipproto); |
61ec2aec YK |
1433 | if (ret < 0) |
1434 | goto tx_err; | |
1435 | ||
6ed10654 | 1436 | return NETDEV_TX_OK; |
61ec2aec | 1437 | |
1da177e4 | 1438 | tx_err: |
2fad1ba3 ED |
1439 | DEV_STATS_INC(dev, tx_errors); |
1440 | DEV_STATS_INC(dev, tx_dropped); | |
1da177e4 | 1441 | kfree_skb(skb); |
6ed10654 | 1442 | return NETDEV_TX_OK; |
1da177e4 LT |
1443 | } |
1444 | ||
3144581c | 1445 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1446 | { |
1447 | struct net_device *dev = t->dev; | |
5fdcce21 | 1448 | struct net_device *tdev = NULL; |
c12b395a | 1449 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1450 | struct flowi6 *fl6 = &t->fl.u.ip6; |
058214a4 | 1451 | int t_hlen; |
d89d7ff0 | 1452 | int mtu; |
1da177e4 | 1453 | |
5a1b7e1a | 1454 | __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr)); |
3a6d54c5 | 1455 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
1da177e4 LT |
1456 | |
1457 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1458 | fl6->saddr = p->laddr; |
1459 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1460 | fl6->flowi6_oif = p->link; |
1461 | fl6->flowlabel = 0; | |
1da177e4 LT |
1462 | |
1463 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1464 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1465 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1466 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1467 | |
d0087b29 VN |
1468 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1469 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1470 | |
1471 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1472 | dev->flags |= IFF_POINTOPOINT; | |
1473 | else | |
1474 | dev->flags &= ~IFF_POINTOPOINT; | |
1475 | ||
058214a4 TH |
1476 | t->tun_hlen = 0; |
1477 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1478 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1479 | ||
1da177e4 | 1480 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
305d4b3c VN |
1481 | int strict = (ipv6_addr_type(&p->raddr) & |
1482 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1483 | ||
0bd87628 | 1484 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1485 | &p->raddr, &p->laddr, |
b75cc8f9 | 1486 | p->link, NULL, strict); |
5fdcce21 WD |
1487 | if (rt) { |
1488 | tdev = rt->dst.dev; | |
1489 | ip6_rt_put(rt); | |
1490 | } | |
1da177e4 | 1491 | |
5fdcce21 WD |
1492 | if (!tdev && p->link) |
1493 | tdev = __dev_get_by_index(t->net, p->link); | |
1da177e4 | 1494 | |
5fdcce21 WD |
1495 | if (tdev) { |
1496 | dev->hard_header_len = tdev->hard_header_len + t_hlen; | |
1497 | mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU); | |
1da177e4 | 1498 | |
d89d7ff0 | 1499 | mtu = mtu - t_hlen; |
381601e5 | 1500 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
d89d7ff0 | 1501 | mtu -= 8; |
1da177e4 | 1502 | |
d89d7ff0 ED |
1503 | if (mtu < IPV6_MIN_MTU) |
1504 | mtu = IPV6_MIN_MTU; | |
1505 | WRITE_ONCE(dev->mtu, mtu); | |
1da177e4 | 1506 | } |
1da177e4 LT |
1507 | } |
1508 | } | |
1509 | ||
1510 | /** | |
3144581c | 1511 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1512 | * @t: tunnel to be changed |
1513 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1514 | * |
1515 | * Description: | |
3144581c | 1516 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1517 | **/ |
1518 | ||
77788567 | 1519 | static void |
c12b395a | 1520 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1521 | { |
4e3fd7a0 AD |
1522 | t->parms.laddr = p->laddr; |
1523 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1524 | t->parms.flags = p->flags; |
1525 | t->parms.hop_limit = p->hop_limit; | |
1526 | t->parms.encap_limit = p->encap_limit; | |
1527 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1528 | t->parms.link = p->link; |
502b0935 | 1529 | t->parms.proto = p->proto; |
0a473b82 | 1530 | t->parms.fwmark = p->fwmark; |
607f725f | 1531 | dst_cache_reset(&t->dst_cache); |
3144581c | 1532 | ip6_tnl_link_config(t); |
1da177e4 LT |
1533 | } |
1534 | ||
77788567 | 1535 | static void ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
0b112457 | 1536 | { |
0bd87628 | 1537 | struct net *net = t->net; |
0b112457 | 1538 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0b112457 ND |
1539 | |
1540 | ip6_tnl_unlink(ip6n, t); | |
1541 | synchronize_net(); | |
77788567 | 1542 | ip6_tnl_change(t, p); |
0b112457 ND |
1543 | ip6_tnl_link(ip6n, t); |
1544 | netdev_state_change(t->dev); | |
0b112457 ND |
1545 | } |
1546 | ||
77788567 | 1547 | static void ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
acf722f7 AA |
1548 | { |
1549 | /* for default tnl0 device allow to change only the proto */ | |
1550 | t->parms.proto = p->proto; | |
1551 | netdev_state_change(t->dev); | |
acf722f7 AA |
1552 | } |
1553 | ||
c12b395a | 1554 | static void |
1555 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1556 | { | |
1557 | p->laddr = u->laddr; | |
1558 | p->raddr = u->raddr; | |
1559 | p->flags = u->flags; | |
1560 | p->hop_limit = u->hop_limit; | |
1561 | p->encap_limit = u->encap_limit; | |
1562 | p->flowinfo = u->flowinfo; | |
1563 | p->link = u->link; | |
1564 | p->proto = u->proto; | |
1565 | memcpy(p->name, u->name, sizeof(u->name)); | |
1566 | } | |
1567 | ||
1568 | static void | |
1569 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1570 | { | |
1571 | u->laddr = p->laddr; | |
1572 | u->raddr = p->raddr; | |
1573 | u->flags = p->flags; | |
1574 | u->hop_limit = p->hop_limit; | |
1575 | u->encap_limit = p->encap_limit; | |
1576 | u->flowinfo = p->flowinfo; | |
1577 | u->link = p->link; | |
1578 | u->proto = p->proto; | |
1579 | memcpy(u->name, p->name, sizeof(u->name)); | |
1580 | } | |
1581 | ||
1da177e4 | 1582 | /** |
3e7a1c7c | 1583 | * ip6_tnl_siocdevprivate - configure ipv6 tunnels from userspace |
1da177e4 | 1584 | * @dev: virtual device associated with tunnel |
3e7a1c7c AB |
1585 | * @ifr: unused |
1586 | * @data: parameters passed from userspace | |
1da177e4 LT |
1587 | * @cmd: command to be performed |
1588 | * | |
1589 | * Description: | |
3144581c | 1590 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1591 | * from userspace. |
1da177e4 LT |
1592 | * |
1593 | * The possible commands are the following: | |
1594 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1595 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1596 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1597 | * %SIOCDELTUNNEL: delete tunnel | |
1598 | * | |
1ab1457c | 1599 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1600 | * initialization, can be used for creating other tunnel devices. |
1601 | * | |
1602 | * Return: | |
1603 | * 0 on success, | |
1604 | * %-EFAULT if unable to copy data to or from userspace, | |
1605 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1606 | * %-EINVAL if passed tunnel parameters are invalid, | |
1607 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1608 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1609 | **/ | |
1610 | ||
1611 | static int | |
3e7a1c7c AB |
1612 | ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr, |
1613 | void __user *data, int cmd) | |
1da177e4 LT |
1614 | { |
1615 | int err = 0; | |
1da177e4 | 1616 | struct ip6_tnl_parm p; |
c12b395a | 1617 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1618 | struct ip6_tnl *t = netdev_priv(dev); |
1619 | struct net *net = t->net; | |
2dd02c89 | 1620 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 1621 | |
0d3c703a TH |
1622 | memset(&p1, 0, sizeof(p1)); |
1623 | ||
1da177e4 LT |
1624 | switch (cmd) { |
1625 | case SIOCGETTUNNEL: | |
15820e12 | 1626 | if (dev == ip6n->fb_tnl_dev) { |
3e7a1c7c | 1627 | if (copy_from_user(&p, data, sizeof(p))) { |
1da177e4 LT |
1628 | err = -EFAULT; |
1629 | break; | |
1630 | } | |
c12b395a | 1631 | ip6_tnl_parm_from_user(&p1, &p); |
1632 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1633 | if (IS_ERR(t)) |
74462f0d | 1634 | t = netdev_priv(dev); |
5ef5d6c5 DC |
1635 | } else { |
1636 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1637 | } |
c12b395a | 1638 | ip6_tnl_parm_to_user(&p, &t->parms); |
3e7a1c7c | 1639 | if (copy_to_user(data, &p, sizeof(p))) |
1da177e4 | 1640 | err = -EFAULT; |
1da177e4 LT |
1641 | break; |
1642 | case SIOCADDTUNNEL: | |
1643 | case SIOCCHGTUNNEL: | |
1644 | err = -EPERM; | |
af31f412 | 1645 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1646 | break; |
567131a7 | 1647 | err = -EFAULT; |
3e7a1c7c | 1648 | if (copy_from_user(&p, data, sizeof(p))) |
1da177e4 | 1649 | break; |
567131a7 | 1650 | err = -EINVAL; |
502b0935 YK |
1651 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1652 | p.proto != 0) | |
1da177e4 | 1653 | break; |
c12b395a | 1654 | ip6_tnl_parm_from_user(&p1, &p); |
1655 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1656 | if (cmd == SIOCCHGTUNNEL) { |
37355565 | 1657 | if (!IS_ERR(t)) { |
567131a7 VN |
1658 | if (t->dev != dev) { |
1659 | err = -EEXIST; | |
1660 | break; | |
1661 | } | |
1662 | } else | |
1663 | t = netdev_priv(dev); | |
acf722f7 | 1664 | if (dev == ip6n->fb_tnl_dev) |
77788567 | 1665 | ip6_tnl0_update(t, &p1); |
acf722f7 | 1666 | else |
77788567 | 1667 | ip6_tnl_update(t, &p1); |
1da177e4 | 1668 | } |
37355565 | 1669 | if (!IS_ERR(t)) { |
1da177e4 | 1670 | err = 0; |
c12b395a | 1671 | ip6_tnl_parm_to_user(&p, &t->parms); |
3e7a1c7c | 1672 | if (copy_to_user(data, &p, sizeof(p))) |
567131a7 VN |
1673 | err = -EFAULT; |
1674 | ||
37355565 ND |
1675 | } else { |
1676 | err = PTR_ERR(t); | |
1677 | } | |
1da177e4 LT |
1678 | break; |
1679 | case SIOCDELTUNNEL: | |
1680 | err = -EPERM; | |
af31f412 | 1681 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1682 | break; |
1683 | ||
15820e12 | 1684 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1685 | err = -EFAULT; |
3e7a1c7c | 1686 | if (copy_from_user(&p, data, sizeof(p))) |
1da177e4 | 1687 | break; |
567131a7 | 1688 | err = -ENOENT; |
c12b395a | 1689 | ip6_tnl_parm_from_user(&p1, &p); |
1690 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1691 | if (IS_ERR(t)) |
1da177e4 | 1692 | break; |
567131a7 | 1693 | err = -EPERM; |
15820e12 | 1694 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1695 | break; |
567131a7 | 1696 | dev = t->dev; |
1da177e4 | 1697 | } |
22f8cde5 SH |
1698 | err = 0; |
1699 | unregister_netdevice(dev); | |
1da177e4 LT |
1700 | break; |
1701 | default: | |
1702 | err = -EINVAL; | |
1703 | } | |
1704 | return err; | |
1705 | } | |
1706 | ||
1da177e4 | 1707 | /** |
3144581c | 1708 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1709 | * @dev: virtual device associated with tunnel |
1710 | * @new_mtu: the new mtu | |
1711 | * | |
1712 | * Return: | |
1713 | * 0 on success, | |
1714 | * %-EINVAL if mtu too small | |
1715 | **/ | |
1716 | ||
79ecb90e | 1717 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1718 | { |
582442d6 OG |
1719 | struct ip6_tnl *tnl = netdev_priv(dev); |
1720 | ||
2fa771be XL |
1721 | if (tnl->parms.proto == IPPROTO_IPV6) { |
1722 | if (new_mtu < IPV6_MIN_MTU) | |
582442d6 OG |
1723 | return -EINVAL; |
1724 | } else { | |
2fa771be | 1725 | if (new_mtu < ETH_MIN_MTU) |
582442d6 | 1726 | return -EINVAL; |
1da177e4 | 1727 | } |
f7ff1fde ND |
1728 | if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) { |
1729 | if (new_mtu > IP6_MAX_MTU - dev->hard_header_len) | |
1730 | return -EINVAL; | |
1731 | } else { | |
1732 | if (new_mtu > IP_MAX_MTU - dev->hard_header_len) | |
1733 | return -EINVAL; | |
1734 | } | |
1da177e4 LT |
1735 | dev->mtu = new_mtu; |
1736 | return 0; | |
1737 | } | |
79ecb90e | 1738 | EXPORT_SYMBOL(ip6_tnl_change_mtu); |
1da177e4 | 1739 | |
ecf2c06a ND |
1740 | int ip6_tnl_get_iflink(const struct net_device *dev) |
1741 | { | |
1742 | struct ip6_tnl *t = netdev_priv(dev); | |
1743 | ||
1744 | return t->parms.link; | |
1745 | } | |
1746 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1326c3d5 | 1747 | |
058214a4 TH |
1748 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, |
1749 | unsigned int num) | |
1750 | { | |
1751 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1752 | return -ERANGE; | |
1753 | ||
1754 | return !cmpxchg((const struct ip6_tnl_encap_ops **) | |
1755 | &ip6tun_encaps[num], | |
1756 | NULL, ops) ? 0 : -1; | |
1757 | } | |
1758 | EXPORT_SYMBOL(ip6_tnl_encap_add_ops); | |
1759 | ||
1760 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, | |
1761 | unsigned int num) | |
1762 | { | |
1763 | int ret; | |
1764 | ||
1765 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1766 | return -ERANGE; | |
1767 | ||
1768 | ret = (cmpxchg((const struct ip6_tnl_encap_ops **) | |
1769 | &ip6tun_encaps[num], | |
1770 | ops, NULL) == ops) ? 0 : -1; | |
1771 | ||
1772 | synchronize_net(); | |
1773 | ||
1774 | return ret; | |
1775 | } | |
1776 | EXPORT_SYMBOL(ip6_tnl_encap_del_ops); | |
1777 | ||
1778 | int ip6_tnl_encap_setup(struct ip6_tnl *t, | |
1779 | struct ip_tunnel_encap *ipencap) | |
1780 | { | |
1781 | int hlen; | |
1782 | ||
1783 | memset(&t->encap, 0, sizeof(t->encap)); | |
1784 | ||
1785 | hlen = ip6_encap_hlen(ipencap); | |
1786 | if (hlen < 0) | |
1787 | return hlen; | |
1788 | ||
1789 | t->encap.type = ipencap->type; | |
1790 | t->encap.sport = ipencap->sport; | |
1791 | t->encap.dport = ipencap->dport; | |
1792 | t->encap.flags = ipencap->flags; | |
1793 | ||
1794 | t->encap_hlen = hlen; | |
1795 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1796 | ||
1797 | return 0; | |
1798 | } | |
1799 | EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); | |
1800 | ||
1326c3d5 | 1801 | static const struct net_device_ops ip6_tnl_netdev_ops = { |
6c6151da | 1802 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1803 | .ndo_uninit = ip6_tnl_dev_uninit, |
8eb30be0 | 1804 | .ndo_start_xmit = ip6_tnl_start_xmit, |
3e7a1c7c | 1805 | .ndo_siocdevprivate = ip6_tnl_siocdevprivate, |
1326c3d5 | 1806 | .ndo_change_mtu = ip6_tnl_change_mtu, |
6b840a04 | 1807 | .ndo_get_stats64 = dev_get_tstats64, |
ecf2c06a | 1808 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1326c3d5 SH |
1809 | }; |
1810 | ||
51c052d4 TH |
1811 | #define IPXIPX_FEATURES (NETIF_F_SG | \ |
1812 | NETIF_F_FRAGLIST | \ | |
1813 | NETIF_F_HIGHDMA | \ | |
1814 | NETIF_F_GSO_SOFTWARE | \ | |
1815 | NETIF_F_HW_CSUM) | |
8560f226 | 1816 | |
1da177e4 | 1817 | /** |
3144581c | 1818 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1819 | * @dev: virtual device associated with tunnel |
1820 | * | |
1821 | * Description: | |
1822 | * Initialize function pointers and device parameters | |
1823 | **/ | |
1824 | ||
3144581c | 1825 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1826 | { |
1326c3d5 | 1827 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
e53ac932 | 1828 | dev->header_ops = &ip_tunnel_header_ops; |
cf124db5 DM |
1829 | dev->needs_free_netdev = true; |
1830 | dev->priv_destructor = ip6_dev_free; | |
1da177e4 LT |
1831 | |
1832 | dev->type = ARPHRD_TUNNEL6; | |
1da177e4 LT |
1833 | dev->flags |= IFF_NOARP; |
1834 | dev->addr_len = sizeof(struct in6_addr); | |
058214a4 | 1835 | dev->features |= NETIF_F_LLTX; |
02875878 | 1836 | netif_keep_dst(dev); |
51c052d4 TH |
1837 | |
1838 | dev->features |= IPXIPX_FEATURES; | |
1839 | dev->hw_features |= IPXIPX_FEATURES; | |
1840 | ||
e837735e ND |
1841 | /* This perm addr will be used as interface identifier by IPv6 */ |
1842 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1843 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1844 | } |
1845 | ||
1846 | ||
1847 | /** | |
3144581c | 1848 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1849 | * @dev: virtual device associated with tunnel |
1850 | **/ | |
1851 | ||
8560f226 | 1852 | static inline int |
3144581c | 1853 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1854 | { |
2941a486 | 1855 | struct ip6_tnl *t = netdev_priv(dev); |
cdf3464e | 1856 | int ret; |
058214a4 | 1857 | int t_hlen; |
8560f226 | 1858 | |
1da177e4 | 1859 | t->dev = dev; |
0bd87628 | 1860 | t->net = dev_net(dev); |
1c213bd2 | 1861 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1862 | if (!dev->tstats) |
1863 | return -ENOMEM; | |
cdf3464e | 1864 | |
607f725f | 1865 | ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); |
0d3c703a TH |
1866 | if (ret) |
1867 | goto free_stats; | |
1868 | ||
1869 | ret = gro_cells_init(&t->gro_cells, dev); | |
1870 | if (ret) | |
1871 | goto destroy_dst; | |
cdf3464e | 1872 | |
79ecb90e | 1873 | t->tun_hlen = 0; |
058214a4 TH |
1874 | t->hlen = t->encap_hlen + t->tun_hlen; |
1875 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1876 | ||
1877 | dev->type = ARPHRD_TUNNEL6; | |
1878 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; | |
1879 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
1880 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1881 | dev->mtu -= 8; | |
b96f9afe | 1882 | dev->min_mtu = ETH_MIN_MTU; |
f7ff1fde | 1883 | dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len; |
79ecb90e | 1884 | |
d62607c3 | 1885 | netdev_hold(dev, &t->dev_tracker, GFP_KERNEL); |
8560f226 | 1886 | return 0; |
0d3c703a TH |
1887 | |
1888 | destroy_dst: | |
1889 | dst_cache_destroy(&t->dst_cache); | |
1890 | free_stats: | |
1891 | free_percpu(dev->tstats); | |
1892 | dev->tstats = NULL; | |
1893 | ||
1894 | return ret; | |
1da177e4 LT |
1895 | } |
1896 | ||
1897 | /** | |
3144581c | 1898 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1899 | * @dev: virtual device associated with tunnel |
1900 | **/ | |
1901 | ||
8560f226 | 1902 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1903 | { |
2941a486 | 1904 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1905 | int err = ip6_tnl_dev_init_gen(dev); |
1906 | ||
1907 | if (err) | |
1908 | return err; | |
3144581c | 1909 | ip6_tnl_link_config(t); |
5311a69a | 1910 | if (t->parms.collect_md) |
8d79266b | 1911 | netif_keep_dst(dev); |
8560f226 | 1912 | return 0; |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | /** | |
3144581c | 1916 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1917 | * @dev: fallback device |
1918 | * | |
1919 | * Return: 0 | |
1920 | **/ | |
1921 | ||
8560f226 | 1922 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1923 | { |
2941a486 | 1924 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1925 | struct net *net = dev_net(dev); |
1926 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1927 | ||
502b0935 | 1928 | t->parms.proto = IPPROTO_IPV6; |
d0087b29 | 1929 | |
cf778b00 | 1930 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1931 | return 0; |
1da177e4 LT |
1932 | } |
1933 | ||
a8b8a889 MS |
1934 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], |
1935 | struct netlink_ext_ack *extack) | |
0b112457 ND |
1936 | { |
1937 | u8 proto; | |
1938 | ||
c8965932 | 1939 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1940 | return 0; |
1941 | ||
1942 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1943 | if (proto != IPPROTO_IPV6 && | |
1944 | proto != IPPROTO_IPIP && | |
1945 | proto != 0) | |
1946 | return -EINVAL; | |
1947 | ||
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1952 | struct __ip6_tnl_parm *parms) | |
1953 | { | |
1954 | memset(parms, 0, sizeof(*parms)); | |
1955 | ||
1956 | if (!data) | |
1957 | return; | |
1958 | ||
1959 | if (data[IFLA_IPTUN_LINK]) | |
1960 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1961 | ||
1962 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 1963 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
0b112457 ND |
1964 | |
1965 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 1966 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
0b112457 ND |
1967 | |
1968 | if (data[IFLA_IPTUN_TTL]) | |
1969 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1970 | ||
1971 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1972 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1973 | ||
1974 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1975 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1976 | |
1977 | if (data[IFLA_IPTUN_FLAGS]) | |
1978 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1979 | ||
1980 | if (data[IFLA_IPTUN_PROTO]) | |
1981 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
8d79266b AS |
1982 | |
1983 | if (data[IFLA_IPTUN_COLLECT_METADATA]) | |
1984 | parms->collect_md = true; | |
0a473b82 CG |
1985 | |
1986 | if (data[IFLA_IPTUN_FWMARK]) | |
1987 | parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
0b112457 ND |
1988 | } |
1989 | ||
1990 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1991 | struct nlattr *tb[], struct nlattr *data[], |
1992 | struct netlink_ext_ack *extack) | |
0b112457 ND |
1993 | { |
1994 | struct net *net = dev_net(dev); | |
8d79266b | 1995 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
b3a27b51 | 1996 | struct ip_tunnel_encap ipencap; |
a6aa8044 XL |
1997 | struct ip6_tnl *nt, *t; |
1998 | int err; | |
0b112457 ND |
1999 | |
2000 | nt = netdev_priv(dev); | |
b3a27b51 | 2001 | |
537dd2d9 | 2002 | if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { |
a6aa8044 | 2003 | err = ip6_tnl_encap_setup(nt, &ipencap); |
b3a27b51 TH |
2004 | if (err < 0) |
2005 | return err; | |
2006 | } | |
2007 | ||
0b112457 ND |
2008 | ip6_tnl_netlink_parms(data, &nt->parms); |
2009 | ||
8d79266b AS |
2010 | if (nt->parms.collect_md) { |
2011 | if (rtnl_dereference(ip6n->collect_md_tun)) | |
2012 | return -EEXIST; | |
2013 | } else { | |
2014 | t = ip6_tnl_locate(net, &nt->parms, 0); | |
2015 | if (!IS_ERR(t)) | |
2016 | return -EEXIST; | |
2017 | } | |
0b112457 | 2018 | |
a6aa8044 XL |
2019 | err = ip6_tnl_create2(dev); |
2020 | if (!err && tb[IFLA_MTU]) | |
2021 | ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
2022 | ||
2023 | return err; | |
0b112457 ND |
2024 | } |
2025 | ||
2026 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
2027 | struct nlattr *data[], |
2028 | struct netlink_ext_ack *extack) | |
0b112457 | 2029 | { |
0bd87628 | 2030 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 2031 | struct __ip6_tnl_parm p; |
0bd87628 | 2032 | struct net *net = t->net; |
0b112457 | 2033 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
b3a27b51 | 2034 | struct ip_tunnel_encap ipencap; |
0b112457 ND |
2035 | |
2036 | if (dev == ip6n->fb_tnl_dev) | |
2037 | return -EINVAL; | |
2038 | ||
537dd2d9 | 2039 | if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { |
b3a27b51 TH |
2040 | int err = ip6_tnl_encap_setup(t, &ipencap); |
2041 | ||
2042 | if (err < 0) | |
2043 | return err; | |
2044 | } | |
0b112457 | 2045 | ip6_tnl_netlink_parms(data, &p); |
8d79266b AS |
2046 | if (p.collect_md) |
2047 | return -EINVAL; | |
0b112457 ND |
2048 | |
2049 | t = ip6_tnl_locate(net, &p, 0); | |
37355565 | 2050 | if (!IS_ERR(t)) { |
0b112457 ND |
2051 | if (t->dev != dev) |
2052 | return -EEXIST; | |
2053 | } else | |
2054 | t = netdev_priv(dev); | |
2055 | ||
77788567 HW |
2056 | ip6_tnl_update(t, &p); |
2057 | return 0; | |
0b112457 ND |
2058 | } |
2059 | ||
1e9f3d6f ND |
2060 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
2061 | { | |
2062 | struct net *net = dev_net(dev); | |
2063 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
2064 | ||
2065 | if (dev != ip6n->fb_tnl_dev) | |
2066 | unregister_netdevice_queue(dev, head); | |
2067 | } | |
2068 | ||
b58d731a | 2069 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
2070 | { |
2071 | return | |
2072 | /* IFLA_IPTUN_LINK */ | |
2073 | nla_total_size(4) + | |
2074 | /* IFLA_IPTUN_LOCAL */ | |
2075 | nla_total_size(sizeof(struct in6_addr)) + | |
2076 | /* IFLA_IPTUN_REMOTE */ | |
2077 | nla_total_size(sizeof(struct in6_addr)) + | |
2078 | /* IFLA_IPTUN_TTL */ | |
2079 | nla_total_size(1) + | |
2080 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
2081 | nla_total_size(1) + | |
2082 | /* IFLA_IPTUN_FLOWINFO */ | |
2083 | nla_total_size(4) + | |
2084 | /* IFLA_IPTUN_FLAGS */ | |
2085 | nla_total_size(4) + | |
cfa323b6 ND |
2086 | /* IFLA_IPTUN_PROTO */ |
2087 | nla_total_size(1) + | |
b3a27b51 TH |
2088 | /* IFLA_IPTUN_ENCAP_TYPE */ |
2089 | nla_total_size(2) + | |
2090 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
2091 | nla_total_size(2) + | |
2092 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
2093 | nla_total_size(2) + | |
2094 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
2095 | nla_total_size(2) + | |
8d79266b AS |
2096 | /* IFLA_IPTUN_COLLECT_METADATA */ |
2097 | nla_total_size(0) + | |
0a473b82 CG |
2098 | /* IFLA_IPTUN_FWMARK */ |
2099 | nla_total_size(4) + | |
c075b130 ND |
2100 | 0; |
2101 | } | |
2102 | ||
b58d731a | 2103 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
2104 | { |
2105 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
2106 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
2107 | ||
2108 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
2109 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
2110 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
c075b130 ND |
2111 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
2112 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
2113 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 | 2114 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
0a473b82 CG |
2115 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || |
2116 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) | |
c075b130 | 2117 | goto nla_put_failure; |
b3a27b51 | 2118 | |
8d79266b AS |
2119 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || |
2120 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || | |
2121 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || | |
2122 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) | |
b3a27b51 TH |
2123 | goto nla_put_failure; |
2124 | ||
8d79266b AS |
2125 | if (parm->collect_md) |
2126 | if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) | |
2127 | goto nla_put_failure; | |
0a473b82 | 2128 | |
c075b130 ND |
2129 | return 0; |
2130 | ||
2131 | nla_put_failure: | |
2132 | return -EMSGSIZE; | |
2133 | } | |
2134 | ||
1728d4fa ND |
2135 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
2136 | { | |
2137 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
2138 | ||
2139 | return tunnel->net; | |
2140 | } | |
2141 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
2142 | ||
0b112457 ND |
2143 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
2144 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
2145 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
2146 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
2147 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
2148 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
2149 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
2150 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
2151 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
b3a27b51 TH |
2152 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
2153 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
2154 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
2155 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
8d79266b | 2156 | [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, |
0a473b82 | 2157 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
0b112457 ND |
2158 | }; |
2159 | ||
c075b130 ND |
2160 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
2161 | .kind = "ip6tnl", | |
2162 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 2163 | .policy = ip6_tnl_policy, |
c075b130 | 2164 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
2165 | .setup = ip6_tnl_dev_setup, |
2166 | .validate = ip6_tnl_validate, | |
2167 | .newlink = ip6_tnl_newlink, | |
2168 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 2169 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
2170 | .get_size = ip6_tnl_get_size, |
2171 | .fill_info = ip6_tnl_fill_info, | |
1728d4fa | 2172 | .get_link_net = ip6_tnl_get_link_net, |
c075b130 ND |
2173 | }; |
2174 | ||
3ff2cfa5 | 2175 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
2176 | .handler = ip4ip6_rcv, |
2177 | .err_handler = ip4ip6_err, | |
2178 | .priority = 1, | |
2179 | }; | |
2180 | ||
3ff2cfa5 | 2181 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
2182 | .handler = ip6ip6_rcv, |
2183 | .err_handler = ip6ip6_err, | |
d2acc347 | 2184 | .priority = 1, |
1da177e4 LT |
2185 | }; |
2186 | ||
f200e98d VF |
2187 | static struct xfrm6_tunnel mplsip6_handler __read_mostly = { |
2188 | .handler = mplsip6_rcv, | |
2189 | .err_handler = mplsip6_err, | |
2190 | .priority = 1, | |
2191 | }; | |
2192 | ||
bb401cae | 2193 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) |
3e6c9fb5 | 2194 | { |
1e9f3d6f | 2195 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 2196 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
2197 | int h; |
2198 | struct ip6_tnl *t; | |
2199 | ||
0bd87628 ND |
2200 | for_each_netdev_safe(net, dev, aux) |
2201 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
bb401cae | 2202 | unregister_netdevice_queue(dev, list); |
0bd87628 | 2203 | |
e87a8f24 | 2204 | for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { |
94767632 | 2205 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 2206 | while (t) { |
0bd87628 ND |
2207 | /* If dev is in the same netns, it has already |
2208 | * been added to the list by the previous loop. | |
2209 | */ | |
2210 | if (!net_eq(dev_net(t->dev), net)) | |
bb401cae | 2211 | unregister_netdevice_queue(t->dev, list); |
94767632 | 2212 | t = rtnl_dereference(t->next); |
cf4432f5 | 2213 | } |
3e6c9fb5 | 2214 | } |
941ea91e HV |
2215 | |
2216 | t = rtnl_dereference(ip6n->tnls_wc[0]); | |
2217 | while (t) { | |
2218 | /* If dev is in the same netns, it has already | |
2219 | * been added to the list by the previous loop. | |
2220 | */ | |
2221 | if (!net_eq(dev_net(t->dev), net)) | |
2222 | unregister_netdevice_queue(t->dev, list); | |
2223 | t = rtnl_dereference(t->next); | |
2224 | } | |
3e6c9fb5 PE |
2225 | } |
2226 | ||
2c8c1e72 | 2227 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 2228 | { |
ac31cd3c | 2229 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 2230 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 2231 | int err; |
13eeb8e9 | 2232 | |
3e6c9fb5 PE |
2233 | ip6n->tnls[0] = ip6n->tnls_wc; |
2234 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
2235 | ||
79134e6c ED |
2236 | if (!net_has_fallback_tunnels(net)) |
2237 | return 0; | |
15820e12 PE |
2238 | err = -ENOMEM; |
2239 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 2240 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
2241 | |
2242 | if (!ip6n->fb_tnl_dev) | |
2243 | goto err_alloc_dev; | |
be77e593 | 2244 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 2245 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
2246 | /* FB netdevice is special: we have one, and only one per netns. |
2247 | * Allowing to move it to another netns is clearly unsafe. | |
2248 | */ | |
2249 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 2250 | |
8560f226 ED |
2251 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
2252 | if (err < 0) | |
2253 | goto err_register; | |
15820e12 PE |
2254 | |
2255 | err = register_netdev(ip6n->fb_tnl_dev); | |
2256 | if (err < 0) | |
2257 | goto err_register; | |
731abb9c JB |
2258 | |
2259 | t = netdev_priv(ip6n->fb_tnl_dev); | |
2260 | ||
2261 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
2262 | return 0; |
2263 | ||
15820e12 | 2264 | err_register: |
cf124db5 | 2265 | free_netdev(ip6n->fb_tnl_dev); |
15820e12 | 2266 | err_alloc_dev: |
13eeb8e9 PE |
2267 | return err; |
2268 | } | |
2269 | ||
bb401cae | 2270 | static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) |
13eeb8e9 | 2271 | { |
bb401cae ED |
2272 | struct net *net; |
2273 | LIST_HEAD(list); | |
2274 | ||
3e6c9fb5 | 2275 | rtnl_lock(); |
bb401cae ED |
2276 | list_for_each_entry(net, net_list, exit_list) |
2277 | ip6_tnl_destroy_tunnels(net, &list); | |
2278 | unregister_netdevice_many(&list); | |
3e6c9fb5 | 2279 | rtnl_unlock(); |
13eeb8e9 PE |
2280 | } |
2281 | ||
2282 | static struct pernet_operations ip6_tnl_net_ops = { | |
2283 | .init = ip6_tnl_init_net, | |
bb401cae | 2284 | .exit_batch = ip6_tnl_exit_batch_net, |
ac31cd3c EB |
2285 | .id = &ip6_tnl_net_id, |
2286 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
2287 | }; |
2288 | ||
1da177e4 LT |
2289 | /** |
2290 | * ip6_tunnel_init - register protocol and reserve needed resources | |
2291 | * | |
2292 | * Return: 0 on success | |
2293 | **/ | |
2294 | ||
2295 | static int __init ip6_tunnel_init(void) | |
2296 | { | |
2297 | int err; | |
2298 | ||
8c22dab0 XL |
2299 | if (!ipv6_mod_enabled()) |
2300 | return -EOPNOTSUPP; | |
2301 | ||
d5aa407f AD |
2302 | err = register_pernet_device(&ip6_tnl_net_ops); |
2303 | if (err < 0) | |
2304 | goto out_pernet; | |
2305 | ||
2306 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
2307 | if (err < 0) { | |
f3213831 | 2308 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 2309 | goto out_ip4ip6; |
c4d3efaf YK |
2310 | } |
2311 | ||
d5aa407f AD |
2312 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
2313 | if (err < 0) { | |
f3213831 | 2314 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 2315 | goto out_ip6ip6; |
1da177e4 | 2316 | } |
f200e98d VF |
2317 | |
2318 | if (ip6_tnl_mpls_supported()) { | |
2319 | err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS); | |
2320 | if (err < 0) { | |
2321 | pr_err("%s: can't register mplsip6\n", __func__); | |
2322 | goto out_mplsip6; | |
2323 | } | |
2324 | } | |
2325 | ||
c075b130 ND |
2326 | err = rtnl_link_register(&ip6_link_ops); |
2327 | if (err < 0) | |
2328 | goto rtnl_link_failed; | |
13eeb8e9 | 2329 | |
1da177e4 | 2330 | return 0; |
d5aa407f | 2331 | |
c075b130 | 2332 | rtnl_link_failed: |
f200e98d VF |
2333 | if (ip6_tnl_mpls_supported()) |
2334 | xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS); | |
2335 | out_mplsip6: | |
c075b130 | 2336 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
d5aa407f | 2337 | out_ip6ip6: |
c4d3efaf | 2338 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
2339 | out_ip4ip6: |
2340 | unregister_pernet_device(&ip6_tnl_net_ops); | |
2341 | out_pernet: | |
1da177e4 LT |
2342 | return err; |
2343 | } | |
2344 | ||
2345 | /** | |
2346 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
2347 | **/ | |
2348 | ||
2349 | static void __exit ip6_tunnel_cleanup(void) | |
2350 | { | |
c075b130 | 2351 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 2352 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 2353 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 2354 | |
73d605d1 | 2355 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 2356 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 2357 | |
f200e98d VF |
2358 | if (ip6_tnl_mpls_supported() && |
2359 | xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS)) | |
2360 | pr_info("%s: can't deregister mplsip6\n", __func__); | |
ac31cd3c | 2361 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
2362 | } |
2363 | ||
2364 | module_init(ip6_tunnel_init); | |
2365 | module_exit(ip6_tunnel_cleanup); |