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 | ||
1da177e4 | 21 | #include <linux/module.h> |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/errno.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/sockios.h> | |
c4d3efaf | 26 | #include <linux/icmp.h> |
1da177e4 LT |
27 | #include <linux/if.h> |
28 | #include <linux/in.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/if_tunnel.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/in6.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <linux/icmpv6.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/rtnetlink.h> | |
39 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | |
42 | #include <asm/uaccess.h> | |
60063497 | 43 | #include <linux/atomic.h> |
1da177e4 | 44 | |
c4d3efaf | 45 | #include <net/icmp.h> |
1da177e4 LT |
46 | #include <net/ip.h> |
47 | #include <net/ipv6.h> | |
1da177e4 LT |
48 | #include <net/ip6_route.h> |
49 | #include <net/addrconf.h> | |
50 | #include <net/ip6_tunnel.h> | |
51 | #include <net/xfrm.h> | |
52 | #include <net/dsfield.h> | |
53 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
54 | #include <net/net_namespace.h> |
55 | #include <net/netns/generic.h> | |
1da177e4 LT |
56 | |
57 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 58 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 59 | MODULE_LICENSE("GPL"); |
6dfbd87a | 60 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 61 | |
1da177e4 | 62 | #ifdef IP6_TNL_DEBUG |
0dc47877 | 63 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
64 | #else |
65 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
66 | #endif | |
67 | ||
68 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 69 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
70 | |
71 | #define HASH_SIZE 32 | |
72 | ||
e69a4adc | 73 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
74 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
75 | (HASH_SIZE - 1)) | |
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); |
1da177e4 | 79 | |
f99189b1 | 80 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 81 | struct ip6_tnl_net { |
15820e12 PE |
82 | /* the IPv6 tunnel fallback device */ |
83 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 84 | /* lists for storing tunnels in use */ |
94767632 ED |
85 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
86 | struct ip6_tnl __rcu *tnls_wc[1]; | |
87 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
88 | }; |
89 | ||
8560f226 ED |
90 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
91 | struct pcpu_tstats { | |
92 | unsigned long rx_packets; | |
93 | unsigned long rx_bytes; | |
94 | unsigned long tx_packets; | |
95 | unsigned long tx_bytes; | |
8ce120f1 | 96 | } __attribute__((aligned(4*sizeof(unsigned long)))); |
8560f226 ED |
97 | |
98 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
99 | { | |
100 | struct pcpu_tstats sum = { 0 }; | |
101 | int i; | |
102 | ||
103 | for_each_possible_cpu(i) { | |
104 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
105 | ||
106 | sum.rx_packets += tstats->rx_packets; | |
107 | sum.rx_bytes += tstats->rx_bytes; | |
108 | sum.tx_packets += tstats->tx_packets; | |
109 | sum.tx_bytes += tstats->tx_bytes; | |
110 | } | |
111 | dev->stats.rx_packets = sum.rx_packets; | |
112 | dev->stats.rx_bytes = sum.rx_bytes; | |
113 | dev->stats.tx_packets = sum.tx_packets; | |
114 | dev->stats.tx_bytes = sum.tx_bytes; | |
115 | return &dev->stats; | |
116 | } | |
117 | ||
2922bc8a | 118 | /* |
94767632 | 119 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 120 | */ |
1da177e4 LT |
121 | |
122 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
123 | { | |
124 | struct dst_entry *dst = t->dst_cache; | |
125 | ||
1ab1457c | 126 | if (dst && dst->obsolete && |
1da177e4 LT |
127 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
128 | t->dst_cache = NULL; | |
129 | dst_release(dst); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | return dst; | |
134 | } | |
135 | ||
136 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
137 | { | |
138 | dst_release(t->dst_cache); | |
139 | t->dst_cache = NULL; | |
140 | } | |
141 | ||
142 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
143 | { | |
144 | struct rt6_info *rt = (struct rt6_info *) dst; | |
145 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
146 | dst_release(t->dst_cache); | |
147 | t->dst_cache = dst; | |
148 | } | |
149 | ||
150 | /** | |
3144581c | 151 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
152 | * @remote: the address of the tunnel exit-point |
153 | * @local: the address of the tunnel entry-point | |
1da177e4 | 154 | * |
1ab1457c | 155 | * Return: |
1da177e4 | 156 | * tunnel matching given end-points if found, |
1ab1457c | 157 | * else fallback tunnel if its device is up, |
1da177e4 LT |
158 | * else %NULL |
159 | **/ | |
160 | ||
2922bc8a ED |
161 | #define for_each_ip6_tunnel_rcu(start) \ |
162 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
163 | ||
1da177e4 | 164 | static struct ip6_tnl * |
b71d1d42 | 165 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 166 | { |
94767632 ED |
167 | unsigned int h0 = HASH(remote); |
168 | unsigned int h1 = HASH(local); | |
1da177e4 | 169 | struct ip6_tnl *t; |
3e6c9fb5 | 170 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 171 | |
2922bc8a | 172 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
173 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
174 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
175 | (t->dev->flags & IFF_UP)) | |
176 | return t; | |
177 | } | |
2922bc8a ED |
178 | t = rcu_dereference(ip6n->tnls_wc[0]); |
179 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
180 | return t; |
181 | ||
182 | return NULL; | |
183 | } | |
184 | ||
185 | /** | |
3144581c | 186 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 187 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
188 | * |
189 | * Description: | |
3144581c | 190 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
191 | * &struct in6_addr entries laddr and raddr in @p. |
192 | * | |
1ab1457c | 193 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
194 | **/ |
195 | ||
94767632 | 196 | static struct ip6_tnl __rcu ** |
b71d1d42 | 197 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p) |
1da177e4 | 198 | { |
b71d1d42 ED |
199 | const struct in6_addr *remote = &p->raddr; |
200 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 201 | unsigned int h = 0; |
1da177e4 LT |
202 | int prio = 0; |
203 | ||
204 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
205 | prio = 1; | |
206 | h = HASH(remote) ^ HASH(local); | |
207 | } | |
3e6c9fb5 | 208 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
209 | } |
210 | ||
211 | /** | |
3144581c | 212 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
213 | * @t: tunnel to be added |
214 | **/ | |
215 | ||
216 | static void | |
2dd02c89 | 217 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 218 | { |
94767632 | 219 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 220 | |
cf778b00 ED |
221 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
222 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
223 | } |
224 | ||
225 | /** | |
3144581c | 226 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
227 | * @t: tunnel to be removed |
228 | **/ | |
229 | ||
230 | static void | |
2dd02c89 | 231 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 232 | { |
94767632 ED |
233 | struct ip6_tnl __rcu **tp; |
234 | struct ip6_tnl *iter; | |
235 | ||
236 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
237 | (iter = rtnl_dereference(*tp)) != NULL; | |
238 | tp = &iter->next) { | |
239 | if (t == iter) { | |
cf778b00 | 240 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
241 | break; |
242 | } | |
243 | } | |
244 | } | |
245 | ||
8560f226 ED |
246 | static void ip6_dev_free(struct net_device *dev) |
247 | { | |
248 | free_percpu(dev->tstats); | |
249 | free_netdev(dev); | |
250 | } | |
251 | ||
1da177e4 LT |
252 | /** |
253 | * ip6_tnl_create() - create a new tunnel | |
254 | * @p: tunnel parameters | |
255 | * @pt: pointer to new tunnel | |
256 | * | |
257 | * Description: | |
258 | * Create tunnel matching given parameters. | |
1ab1457c YH |
259 | * |
260 | * Return: | |
567131a7 | 261 | * created tunnel or NULL |
1da177e4 LT |
262 | **/ |
263 | ||
2dd02c89 | 264 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
265 | { |
266 | struct net_device *dev; | |
267 | struct ip6_tnl *t; | |
268 | char name[IFNAMSIZ]; | |
269 | int err; | |
2dd02c89 | 270 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 271 | |
34cc7ba6 | 272 | if (p->name[0]) |
1da177e4 | 273 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
274 | else |
275 | sprintf(name, "ip6tnl%%d"); | |
276 | ||
3144581c | 277 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 278 | if (dev == NULL) |
567131a7 | 279 | goto failed; |
1da177e4 | 280 | |
554eb277 PE |
281 | dev_net_set(dev, net); |
282 | ||
2941a486 | 283 | t = netdev_priv(dev); |
1da177e4 | 284 | t->parms = *p; |
8560f226 ED |
285 | err = ip6_tnl_dev_init(dev); |
286 | if (err < 0) | |
287 | goto failed_free; | |
1da177e4 | 288 | |
b37d428b PE |
289 | if ((err = register_netdevice(dev)) < 0) |
290 | goto failed_free; | |
291 | ||
731abb9c JB |
292 | strcpy(t->parms.name, dev->name); |
293 | ||
1da177e4 | 294 | dev_hold(dev); |
2dd02c89 | 295 | ip6_tnl_link(ip6n, t); |
567131a7 | 296 | return t; |
b37d428b PE |
297 | |
298 | failed_free: | |
8560f226 | 299 | ip6_dev_free(dev); |
567131a7 VN |
300 | failed: |
301 | return NULL; | |
1da177e4 LT |
302 | } |
303 | ||
304 | /** | |
3144581c | 305 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 306 | * @p: tunnel parameters |
1da177e4 LT |
307 | * @create: != 0 if allowed to create new tunnel if no match found |
308 | * | |
309 | * Description: | |
3144581c | 310 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
311 | * based on @parms. If this is unsuccessful, but @create is set a new |
312 | * tunnel device is created and registered for use. | |
313 | * | |
314 | * Return: | |
567131a7 | 315 | * matching tunnel or NULL |
1da177e4 LT |
316 | **/ |
317 | ||
2dd02c89 PE |
318 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
319 | struct ip6_tnl_parm *p, int create) | |
1da177e4 | 320 | { |
b71d1d42 ED |
321 | const struct in6_addr *remote = &p->raddr; |
322 | const struct in6_addr *local = &p->laddr; | |
94767632 | 323 | struct ip6_tnl __rcu **tp; |
1da177e4 | 324 | struct ip6_tnl *t; |
2dd02c89 | 325 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 326 | |
94767632 ED |
327 | for (tp = ip6_tnl_bucket(ip6n, p); |
328 | (t = rtnl_dereference(*tp)) != NULL; | |
329 | tp = &t->next) { | |
1da177e4 | 330 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
331 | ipv6_addr_equal(remote, &t->parms.raddr)) |
332 | return t; | |
1da177e4 LT |
333 | } |
334 | if (!create) | |
567131a7 | 335 | return NULL; |
2dd02c89 | 336 | return ip6_tnl_create(net, p); |
1da177e4 LT |
337 | } |
338 | ||
339 | /** | |
3144581c | 340 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 341 | * @dev: the device to be destroyed |
1ab1457c | 342 | * |
1da177e4 | 343 | * Description: |
3144581c | 344 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
345 | **/ |
346 | ||
347 | static void | |
3144581c | 348 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 349 | { |
2941a486 | 350 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
351 | struct net *net = dev_net(dev); |
352 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 353 | |
94767632 | 354 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 355 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 356 | else |
2dd02c89 | 357 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
358 | ip6_tnl_dst_reset(t); |
359 | dev_put(dev); | |
360 | } | |
361 | ||
362 | /** | |
363 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
364 | * @skb: received socket buffer | |
365 | * | |
1ab1457c YH |
366 | * Return: |
367 | * 0 if none was found, | |
1da177e4 LT |
368 | * else index to encapsulation limit |
369 | **/ | |
370 | ||
371 | static __u16 | |
372 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
373 | { | |
b71d1d42 | 374 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
375 | __u8 nexthdr = ipv6h->nexthdr; |
376 | __u16 off = sizeof (*ipv6h); | |
377 | ||
378 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
379 | __u16 optlen = 0; | |
380 | struct ipv6_opt_hdr *hdr; | |
381 | if (raw + off + sizeof (*hdr) > skb->data && | |
382 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
383 | break; | |
384 | ||
385 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
386 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
387 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
388 | if (frag_hdr->frag_off) | |
389 | break; | |
390 | optlen = 8; | |
391 | } else if (nexthdr == NEXTHDR_AUTH) { | |
392 | optlen = (hdr->hdrlen + 2) << 2; | |
393 | } else { | |
394 | optlen = ipv6_optlen(hdr); | |
395 | } | |
396 | if (nexthdr == NEXTHDR_DEST) { | |
397 | __u16 i = off + 2; | |
398 | while (1) { | |
399 | struct ipv6_tlv_tnl_enc_lim *tel; | |
400 | ||
401 | /* No more room for encapsulation limit */ | |
402 | if (i + sizeof (*tel) > off + optlen) | |
403 | break; | |
404 | ||
405 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
406 | /* return index of option if found and valid */ | |
407 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
408 | tel->length == 1) | |
409 | return i; | |
410 | /* else jump to next option */ | |
411 | if (tel->type) | |
412 | i += tel->length + 2; | |
413 | else | |
414 | i++; | |
415 | } | |
416 | } | |
417 | nexthdr = hdr->nexthdr; | |
418 | off += optlen; | |
419 | } | |
420 | return 0; | |
421 | } | |
422 | ||
423 | /** | |
e490d1d8 | 424 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
425 | * |
426 | * Description: | |
e490d1d8 | 427 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
428 | * to the specifications in RFC 2473. |
429 | **/ | |
430 | ||
d2acc347 | 431 | static int |
502b0935 | 432 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 433 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 434 | { |
b71d1d42 | 435 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
436 | struct ip6_tnl *t; |
437 | int rel_msg = 0; | |
d5fdd6ba BH |
438 | u8 rel_type = ICMPV6_DEST_UNREACH; |
439 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
440 | __u32 rel_info = 0; |
441 | __u16 len; | |
d2acc347 | 442 | int err = -ENOENT; |
1da177e4 | 443 | |
1ab1457c YH |
444 | /* If the packet doesn't contain the original IPv6 header we are |
445 | in trouble since we might need the source address for further | |
1da177e4 LT |
446 | processing of the error. */ |
447 | ||
2922bc8a | 448 | rcu_read_lock(); |
8704ca7e | 449 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 450 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
451 | goto out; |
452 | ||
502b0935 YK |
453 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
454 | goto out; | |
455 | ||
d2acc347 HX |
456 | err = 0; |
457 | ||
e490d1d8 | 458 | switch (*type) { |
1da177e4 LT |
459 | __u32 teli; |
460 | struct ipv6_tlv_tnl_enc_lim *tel; | |
461 | __u32 mtu; | |
462 | case ICMPV6_DEST_UNREACH: | |
463 | if (net_ratelimit()) | |
464 | printk(KERN_WARNING | |
465 | "%s: Path to destination invalid " | |
466 | "or inactive!\n", t->parms.name); | |
467 | rel_msg = 1; | |
468 | break; | |
469 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 470 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
471 | if (net_ratelimit()) |
472 | printk(KERN_WARNING | |
473 | "%s: Too small hop limit or " | |
1ab1457c | 474 | "routing loop in tunnel!\n", |
1da177e4 LT |
475 | t->parms.name); |
476 | rel_msg = 1; | |
477 | } | |
478 | break; | |
479 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 480 | teli = 0; |
e490d1d8 | 481 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 482 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 483 | |
704eae1f | 484 | if (teli && teli == *info - 2) { |
1da177e4 LT |
485 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
486 | if (tel->encap_limit == 0) { | |
487 | if (net_ratelimit()) | |
488 | printk(KERN_WARNING | |
489 | "%s: Too small encapsulation " | |
490 | "limit or routing loop in " | |
491 | "tunnel!\n", t->parms.name); | |
492 | rel_msg = 1; | |
493 | } | |
107a5fe6 VN |
494 | } else if (net_ratelimit()) { |
495 | printk(KERN_WARNING | |
496 | "%s: Recipient unable to parse tunneled " | |
497 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
498 | } |
499 | break; | |
500 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 501 | mtu = *info - offset; |
1da177e4 LT |
502 | if (mtu < IPV6_MIN_MTU) |
503 | mtu = IPV6_MIN_MTU; | |
504 | t->dev->mtu = mtu; | |
505 | ||
cc6cdac0 | 506 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
507 | rel_type = ICMPV6_PKT_TOOBIG; |
508 | rel_code = 0; | |
509 | rel_info = mtu; | |
510 | rel_msg = 1; | |
511 | } | |
512 | break; | |
513 | } | |
e490d1d8 YK |
514 | |
515 | *type = rel_type; | |
516 | *code = rel_code; | |
517 | *info = rel_info; | |
518 | *msg = rel_msg; | |
519 | ||
520 | out: | |
2922bc8a | 521 | rcu_read_unlock(); |
e490d1d8 YK |
522 | return err; |
523 | } | |
524 | ||
c4d3efaf YK |
525 | static int |
526 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 527 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
528 | { |
529 | int rel_msg = 0; | |
d5fdd6ba BH |
530 | u8 rel_type = type; |
531 | u8 rel_code = code; | |
704eae1f | 532 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
533 | int err; |
534 | struct sk_buff *skb2; | |
b71d1d42 | 535 | const struct iphdr *eiph; |
c4d3efaf | 536 | struct rtable *rt; |
31e4543d | 537 | struct flowi4 fl4; |
c4d3efaf | 538 | |
502b0935 YK |
539 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
540 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
541 | if (err < 0) |
542 | return err; | |
543 | ||
544 | if (rel_msg == 0) | |
545 | return 0; | |
546 | ||
547 | switch (rel_type) { | |
548 | case ICMPV6_DEST_UNREACH: | |
549 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
550 | return 0; | |
551 | rel_type = ICMP_DEST_UNREACH; | |
552 | rel_code = ICMP_HOST_UNREACH; | |
553 | break; | |
554 | case ICMPV6_PKT_TOOBIG: | |
555 | if (rel_code != 0) | |
556 | return 0; | |
557 | rel_type = ICMP_DEST_UNREACH; | |
558 | rel_code = ICMP_FRAG_NEEDED; | |
559 | break; | |
560 | default: | |
561 | return 0; | |
562 | } | |
563 | ||
564 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
565 | return 0; | |
566 | ||
567 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
568 | if (!skb2) | |
569 | return 0; | |
570 | ||
adf30907 ED |
571 | skb_dst_drop(skb2); |
572 | ||
c4d3efaf | 573 | skb_pull(skb2, offset); |
c1d2bbe1 | 574 | skb_reset_network_header(skb2); |
eddc9ec5 | 575 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
576 | |
577 | /* Try to guess incoming interface */ | |
31e4543d | 578 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
579 | eiph->saddr, 0, |
580 | 0, 0, | |
581 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 582 | if (IS_ERR(rt)) |
c4d3efaf YK |
583 | goto out; |
584 | ||
d8d1f30b | 585 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
586 | |
587 | /* route "incoming" packet */ | |
588 | if (rt->rt_flags & RTCF_LOCAL) { | |
589 | ip_rt_put(rt); | |
590 | rt = NULL; | |
31e4543d | 591 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
592 | eiph->daddr, eiph->saddr, |
593 | 0, 0, | |
594 | IPPROTO_IPIP, | |
595 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 596 | if (IS_ERR(rt) || |
d8d1f30b | 597 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
598 | if (!IS_ERR(rt)) |
599 | ip_rt_put(rt); | |
c4d3efaf YK |
600 | goto out; |
601 | } | |
b23dd4fe | 602 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
603 | } else { |
604 | ip_rt_put(rt); | |
605 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
606 | skb2->dev) || | |
adf30907 | 607 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
608 | goto out; |
609 | } | |
610 | ||
611 | /* change mtu on this route */ | |
612 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 613 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
614 | goto out; |
615 | ||
adf30907 | 616 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
617 | } |
618 | ||
704eae1f | 619 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
620 | |
621 | out: | |
622 | kfree_skb(skb2); | |
623 | return 0; | |
624 | } | |
625 | ||
e490d1d8 YK |
626 | static int |
627 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 628 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
629 | { |
630 | int rel_msg = 0; | |
d5fdd6ba BH |
631 | u8 rel_type = type; |
632 | u8 rel_code = code; | |
704eae1f | 633 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
634 | int err; |
635 | ||
502b0935 YK |
636 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
637 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
638 | if (err < 0) |
639 | return err; | |
640 | ||
641 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
642 | struct rt6_info *rt; |
643 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 644 | |
1da177e4 | 645 | if (!skb2) |
e490d1d8 | 646 | return 0; |
1da177e4 | 647 | |
adf30907 | 648 | skb_dst_drop(skb2); |
1da177e4 | 649 | skb_pull(skb2, offset); |
c1d2bbe1 | 650 | skb_reset_network_header(skb2); |
1da177e4 LT |
651 | |
652 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
653 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
654 | NULL, 0, 0); | |
1da177e4 | 655 | |
d1918542 DM |
656 | if (rt && rt->dst.dev) |
657 | skb2->dev = rt->dst.dev; | |
1da177e4 | 658 | |
3ffe533c | 659 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
660 | |
661 | if (rt) | |
d8d1f30b | 662 | dst_release(&rt->dst); |
1da177e4 LT |
663 | |
664 | kfree_skb(skb2); | |
665 | } | |
e490d1d8 YK |
666 | |
667 | return 0; | |
1da177e4 LT |
668 | } |
669 | ||
b71d1d42 ED |
670 | static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
671 | const struct ipv6hdr *ipv6h, | |
c4d3efaf YK |
672 | struct sk_buff *skb) |
673 | { | |
674 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
675 | ||
676 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 677 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
678 | |
679 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 680 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
681 | } |
682 | ||
b71d1d42 ED |
683 | static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
684 | const struct ipv6hdr *ipv6h, | |
8359925b | 685 | struct sk_buff *skb) |
1da177e4 | 686 | { |
8359925b | 687 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 688 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 689 | |
8359925b | 690 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 691 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 692 | } |
8359925b | 693 | |
f1a28eab | 694 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
695 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
696 | { | |
697 | struct ip6_tnl_parm *p = &t->parms; | |
698 | int ret = 0; | |
2f7f54b7 | 699 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
700 | |
701 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 702 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
703 | |
704 | if (p->link) | |
f1a28eab | 705 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
706 | |
707 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
708 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
709 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
710 | ret = 1; |
711 | ||
09c6bbf0 VN |
712 | } |
713 | return ret; | |
714 | } | |
1da177e4 LT |
715 | |
716 | /** | |
3144581c | 717 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 718 | * @skb: received socket buffer |
8359925b YK |
719 | * @protocol: ethernet protocol ID |
720 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
721 | * |
722 | * Return: 0 | |
723 | **/ | |
724 | ||
8359925b | 725 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 726 | __u8 ipproto, |
b71d1d42 ED |
727 | void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
728 | const struct ipv6hdr *ipv6h, | |
8359925b | 729 | struct sk_buff *skb)) |
1da177e4 | 730 | { |
1da177e4 | 731 | struct ip6_tnl *t; |
b71d1d42 | 732 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 733 | |
2922bc8a | 734 | rcu_read_lock(); |
1da177e4 | 735 | |
8704ca7e | 736 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 737 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
738 | struct pcpu_tstats *tstats; |
739 | ||
502b0935 | 740 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 741 | rcu_read_unlock(); |
502b0935 YK |
742 | goto discard; |
743 | } | |
744 | ||
1da177e4 | 745 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 746 | rcu_read_unlock(); |
50fba2aa | 747 | goto discard; |
1da177e4 LT |
748 | } |
749 | ||
09c6bbf0 | 750 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 751 | t->dev->stats.rx_dropped++; |
2922bc8a | 752 | rcu_read_unlock(); |
1da177e4 LT |
753 | goto discard; |
754 | } | |
755 | secpath_reset(skb); | |
b0e380b1 | 756 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 757 | skb_reset_network_header(skb); |
8359925b | 758 | skb->protocol = htons(protocol); |
1da177e4 LT |
759 | skb->pkt_type = PACKET_HOST; |
760 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 761 | |
8560f226 ED |
762 | tstats = this_cpu_ptr(t->dev->tstats); |
763 | tstats->rx_packets++; | |
764 | tstats->rx_bytes += skb->len; | |
765 | ||
766 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 767 | |
d19d56dd | 768 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 769 | |
caf586e5 | 770 | netif_rx(skb); |
8990f468 | 771 | |
2922bc8a | 772 | rcu_read_unlock(); |
1da177e4 LT |
773 | return 0; |
774 | } | |
2922bc8a | 775 | rcu_read_unlock(); |
1da177e4 | 776 | return 1; |
50fba2aa HX |
777 | |
778 | discard: | |
779 | kfree_skb(skb); | |
780 | return 0; | |
1da177e4 LT |
781 | } |
782 | ||
c4d3efaf YK |
783 | static int ip4ip6_rcv(struct sk_buff *skb) |
784 | { | |
502b0935 YK |
785 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
786 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
787 | } |
788 | ||
8359925b YK |
789 | static int ip6ip6_rcv(struct sk_buff *skb) |
790 | { | |
502b0935 YK |
791 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
792 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
793 | } |
794 | ||
6fb32dde VN |
795 | struct ipv6_tel_txoption { |
796 | struct ipv6_txoptions ops; | |
797 | __u8 dst_opt[8]; | |
798 | }; | |
1da177e4 | 799 | |
6fb32dde VN |
800 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
801 | { | |
802 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 803 | |
6fb32dde VN |
804 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
805 | opt->dst_opt[3] = 1; | |
806 | opt->dst_opt[4] = encap_limit; | |
807 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
808 | opt->dst_opt[6] = 1; | |
1da177e4 | 809 | |
6fb32dde VN |
810 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
811 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
812 | } |
813 | ||
814 | /** | |
3144581c | 815 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 816 | * @t: the outgoing tunnel device |
1ab1457c | 817 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
818 | * |
819 | * Description: | |
1ab1457c | 820 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
821 | * doesn't match source of incoming packet. |
822 | * | |
1ab1457c | 823 | * Return: |
1da177e4 LT |
824 | * 1 if conflict, |
825 | * 0 else | |
826 | **/ | |
827 | ||
828 | static inline int | |
b71d1d42 | 829 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
830 | { |
831 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
832 | } | |
833 | ||
09c6bbf0 VN |
834 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
835 | { | |
836 | struct ip6_tnl_parm *p = &t->parms; | |
837 | int ret = 0; | |
2f7f54b7 | 838 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 839 | |
1ab1457c | 840 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
841 | struct net_device *ldev = NULL; |
842 | ||
f1a28eab | 843 | rcu_read_lock(); |
09c6bbf0 | 844 | if (p->link) |
f1a28eab | 845 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 846 | |
2f7f54b7 | 847 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
848 | printk(KERN_WARNING |
849 | "%s xmit: Local address not yet configured!\n", | |
850 | p->name); | |
851 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 852 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
853 | printk(KERN_WARNING |
854 | "%s xmit: Routing loop! " | |
855 | "Remote address found on this node!\n", | |
856 | p->name); | |
857 | else | |
858 | ret = 1; | |
f1a28eab | 859 | rcu_read_unlock(); |
09c6bbf0 VN |
860 | } |
861 | return ret; | |
862 | } | |
1da177e4 | 863 | /** |
61ec2aec | 864 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 865 | * @skb: the outgoing socket buffer |
1ab1457c | 866 | * @dev: the outgoing tunnel device |
61ec2aec YK |
867 | * @dsfield: dscp code for outer header |
868 | * @fl: flow of tunneled packet | |
869 | * @encap_limit: encapsulation limit | |
870 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
871 | * |
872 | * Description: | |
873 | * Build new header and do some sanity checks on the packet before sending | |
874 | * it. | |
875 | * | |
1ab1457c | 876 | * Return: |
c4d3efaf | 877 | * 0 on success |
61ec2aec YK |
878 | * -1 fail |
879 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
880 | **/ |
881 | ||
61ec2aec YK |
882 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
883 | struct net_device *dev, | |
884 | __u8 dsfield, | |
4c9483b2 | 885 | struct flowi6 *fl6, |
61ec2aec YK |
886 | int encap_limit, |
887 | __u32 *pmtu) | |
1da177e4 | 888 | { |
52479b62 | 889 | struct net *net = dev_net(dev); |
2941a486 | 890 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 891 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 892 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 893 | struct ipv6_tel_txoption opt; |
d24f22f3 | 894 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
895 | struct net_device *tdev; |
896 | int mtu; | |
c2636b4d | 897 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 898 | u8 proto; |
61ec2aec | 899 | int err = -1; |
1da177e4 | 900 | int pkt_len; |
1da177e4 | 901 | |
d24f22f3 ED |
902 | if (!fl6->flowi6_mark) |
903 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
904 | if (!dst) { |
905 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 906 | |
89b02126 | 907 | if (ndst->error) |
a57ebc90 | 908 | goto tx_err_link_failure; |
89b02126 ED |
909 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
910 | if (IS_ERR(ndst)) { | |
911 | err = PTR_ERR(ndst); | |
912 | ndst = NULL; | |
452edd59 DM |
913 | goto tx_err_link_failure; |
914 | } | |
89b02126 | 915 | dst = ndst; |
a57ebc90 | 916 | } |
1da177e4 LT |
917 | |
918 | tdev = dst->dev; | |
919 | ||
920 | if (tdev == dev) { | |
921 | stats->collisions++; | |
922 | if (net_ratelimit()) | |
1ab1457c | 923 | printk(KERN_WARNING |
1da177e4 LT |
924 | "%s: Local routing loop detected!\n", |
925 | t->parms.name); | |
926 | goto tx_err_dst_release; | |
927 | } | |
928 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 929 | if (encap_limit >= 0) { |
1da177e4 LT |
930 | max_headroom += 8; |
931 | mtu -= 8; | |
932 | } | |
933 | if (mtu < IPV6_MIN_MTU) | |
934 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
935 | if (skb_dst(skb)) |
936 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 937 | if (skb->len > mtu) { |
61ec2aec YK |
938 | *pmtu = mtu; |
939 | err = -EMSGSIZE; | |
1da177e4 LT |
940 | goto tx_err_dst_release; |
941 | } | |
942 | ||
943 | /* | |
944 | * Okay, now see if we can stuff it in the buffer as-is. | |
945 | */ | |
946 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 947 | |
cfbba49d PM |
948 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
949 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 950 | struct sk_buff *new_skb; |
1ab1457c | 951 | |
1da177e4 LT |
952 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
953 | goto tx_err_dst_release; | |
954 | ||
955 | if (skb->sk) | |
956 | skb_set_owner_w(new_skb, skb->sk); | |
957 | kfree_skb(skb); | |
958 | skb = new_skb; | |
959 | } | |
adf30907 | 960 | skb_dst_drop(skb); |
d24f22f3 ED |
961 | if (fl6->flowi6_mark) { |
962 | skb_dst_set(skb, dst); | |
963 | ndst = NULL; | |
964 | } else { | |
965 | skb_dst_set_noref(skb, dst); | |
966 | } | |
b0e380b1 | 967 | skb->transport_header = skb->network_header; |
1da177e4 | 968 | |
4c9483b2 | 969 | proto = fl6->flowi6_proto; |
6fb32dde VN |
970 | if (encap_limit >= 0) { |
971 | init_tel_txopt(&opt, encap_limit); | |
972 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
973 | } | |
e2d1bca7 ACM |
974 | skb_push(skb, sizeof(struct ipv6hdr)); |
975 | skb_reset_network_header(skb); | |
0660e03f | 976 | ipv6h = ipv6_hdr(skb); |
4c9483b2 | 977 | *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000); |
1da177e4 LT |
978 | dsfield = INET_ECN_encapsulate(0, dsfield); |
979 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
980 | ipv6h->hop_limit = t->parms.hop_limit; |
981 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
982 | ipv6h->saddr = fl6->saddr; |
983 | ipv6h->daddr = fl6->daddr; | |
1da177e4 LT |
984 | nf_reset(skb); |
985 | pkt_len = skb->len; | |
ef76bc23 | 986 | err = ip6_local_out(skb); |
1da177e4 | 987 | |
b9df3cb8 | 988 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
989 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
990 | ||
991 | tstats->tx_bytes += pkt_len; | |
992 | tstats->tx_packets++; | |
1da177e4 LT |
993 | } else { |
994 | stats->tx_errors++; | |
995 | stats->tx_aborted_errors++; | |
996 | } | |
89b02126 ED |
997 | if (ndst) |
998 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
999 | return 0; |
1000 | tx_err_link_failure: | |
1001 | stats->tx_carrier_errors++; | |
1002 | dst_link_failure(skb); | |
1003 | tx_err_dst_release: | |
89b02126 | 1004 | dst_release(ndst); |
61ec2aec YK |
1005 | return err; |
1006 | } | |
1007 | ||
c4d3efaf YK |
1008 | static inline int |
1009 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1010 | { | |
1011 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1012 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1013 | int encap_limit = -1; |
4c9483b2 | 1014 | struct flowi6 fl6; |
c4d3efaf YK |
1015 | __u8 dsfield; |
1016 | __u32 mtu; | |
1017 | int err; | |
1018 | ||
502b0935 YK |
1019 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1020 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1021 | return -1; |
1022 | ||
1023 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1024 | encap_limit = t->parms.encap_limit; | |
1025 | ||
4c9483b2 DM |
1026 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1027 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1028 | |
1029 | dsfield = ipv4_get_dsfield(iph); | |
1030 | ||
d24f22f3 | 1031 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1032 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1033 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1034 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1035 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1036 | |
4c9483b2 | 1037 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1038 | if (err != 0) { |
1039 | /* XXX: send ICMP error even if DF is not set. */ | |
1040 | if (err == -EMSGSIZE) | |
1041 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1042 | htonl(mtu)); | |
1043 | return -1; | |
1044 | } | |
1045 | ||
1046 | return 0; | |
1047 | } | |
1048 | ||
61ec2aec YK |
1049 | static inline int |
1050 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1051 | { | |
1052 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1053 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1054 | int encap_limit = -1; |
1055 | __u16 offset; | |
4c9483b2 | 1056 | struct flowi6 fl6; |
61ec2aec YK |
1057 | __u8 dsfield; |
1058 | __u32 mtu; | |
1059 | int err; | |
1060 | ||
502b0935 YK |
1061 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1062 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1063 | return -1; |
1064 | ||
d56f90a7 ACM |
1065 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1066 | if (offset > 0) { | |
61ec2aec | 1067 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1068 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1069 | if (tel->encap_limit == 0) { |
1070 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1071 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1072 | return -1; |
1073 | } | |
1074 | encap_limit = tel->encap_limit - 1; | |
1075 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1076 | encap_limit = t->parms.encap_limit; | |
1077 | ||
4c9483b2 DM |
1078 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1079 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1080 | |
1081 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1082 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1083 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1084 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1085 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1086 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1087 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1088 | |
4c9483b2 | 1089 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1090 | if (err != 0) { |
1091 | if (err == -EMSGSIZE) | |
3ffe533c | 1092 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1093 | return -1; |
1094 | } | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
6fef4c0c | 1099 | static netdev_tx_t |
61ec2aec YK |
1100 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1101 | { | |
1102 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1103 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1104 | int ret; |
1105 | ||
61ec2aec | 1106 | switch (skb->protocol) { |
60678040 | 1107 | case htons(ETH_P_IP): |
c4d3efaf YK |
1108 | ret = ip4ip6_tnl_xmit(skb, dev); |
1109 | break; | |
60678040 | 1110 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1111 | ret = ip6ip6_tnl_xmit(skb, dev); |
1112 | break; | |
1113 | default: | |
1114 | goto tx_err; | |
1115 | } | |
1116 | ||
1117 | if (ret < 0) | |
1118 | goto tx_err; | |
1119 | ||
6ed10654 | 1120 | return NETDEV_TX_OK; |
61ec2aec | 1121 | |
1da177e4 LT |
1122 | tx_err: |
1123 | stats->tx_errors++; | |
1124 | stats->tx_dropped++; | |
1125 | kfree_skb(skb); | |
6ed10654 | 1126 | return NETDEV_TX_OK; |
1da177e4 LT |
1127 | } |
1128 | ||
1129 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1130 | { | |
1131 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1132 | int ltype = ipv6_addr_type(&p->laddr); |
1133 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1134 | |
1135 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1136 | ||
09c6bbf0 VN |
1137 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1138 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1139 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1140 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1141 | if (ltype&IPV6_ADDR_UNICAST) |
1142 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1143 | if (rtype&IPV6_ADDR_UNICAST) | |
1144 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1145 | } |
1146 | } | |
1147 | ||
3144581c | 1148 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1149 | { |
1150 | struct net_device *dev = t->dev; | |
1151 | struct ip6_tnl_parm *p = &t->parms; | |
4c9483b2 | 1152 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1153 | |
3a6d54c5 JP |
1154 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1155 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1156 | |
1157 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1158 | fl6->saddr = p->laddr; |
1159 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1160 | fl6->flowi6_oif = p->link; |
1161 | fl6->flowlabel = 0; | |
1da177e4 LT |
1162 | |
1163 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1164 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1165 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1166 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 LT |
1167 | |
1168 | ip6_tnl_set_cap(t); | |
1169 | ||
1170 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1171 | dev->flags |= IFF_POINTOPOINT; | |
1172 | else | |
1173 | dev->flags &= ~IFF_POINTOPOINT; | |
1174 | ||
1175 | dev->iflink = p->link; | |
1176 | ||
1177 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1178 | int strict = (ipv6_addr_type(&p->raddr) & |
1179 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1180 | ||
2f7f54b7 PE |
1181 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1182 | &p->raddr, &p->laddr, | |
305d4b3c | 1183 | p->link, strict); |
1da177e4 LT |
1184 | |
1185 | if (rt == NULL) | |
1186 | return; | |
1187 | ||
d1918542 DM |
1188 | if (rt->dst.dev) { |
1189 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1190 | sizeof (struct ipv6hdr); |
1191 | ||
d1918542 | 1192 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1193 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1194 | dev->mtu-=8; | |
1da177e4 LT |
1195 | |
1196 | if (dev->mtu < IPV6_MIN_MTU) | |
1197 | dev->mtu = IPV6_MIN_MTU; | |
1198 | } | |
d8d1f30b | 1199 | dst_release(&rt->dst); |
1da177e4 LT |
1200 | } |
1201 | } | |
1202 | ||
1203 | /** | |
3144581c | 1204 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1205 | * @t: tunnel to be changed |
1206 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1207 | * |
1208 | * Description: | |
3144581c | 1209 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1210 | **/ |
1211 | ||
1212 | static int | |
3144581c | 1213 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 | 1214 | { |
4e3fd7a0 AD |
1215 | t->parms.laddr = p->laddr; |
1216 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1217 | t->parms.flags = p->flags; |
1218 | t->parms.hop_limit = p->hop_limit; | |
1219 | t->parms.encap_limit = p->encap_limit; | |
1220 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1221 | t->parms.link = p->link; |
502b0935 | 1222 | t->parms.proto = p->proto; |
0c088890 | 1223 | ip6_tnl_dst_reset(t); |
3144581c | 1224 | ip6_tnl_link_config(t); |
1da177e4 LT |
1225 | return 0; |
1226 | } | |
1227 | ||
1228 | /** | |
3144581c | 1229 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1230 | * @dev: virtual device associated with tunnel |
1231 | * @ifr: parameters passed from userspace | |
1232 | * @cmd: command to be performed | |
1233 | * | |
1234 | * Description: | |
3144581c | 1235 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1236 | * from userspace. |
1da177e4 LT |
1237 | * |
1238 | * The possible commands are the following: | |
1239 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1240 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1241 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1242 | * %SIOCDELTUNNEL: delete tunnel | |
1243 | * | |
1ab1457c | 1244 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1245 | * initialization, can be used for creating other tunnel devices. |
1246 | * | |
1247 | * Return: | |
1248 | * 0 on success, | |
1249 | * %-EFAULT if unable to copy data to or from userspace, | |
1250 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1251 | * %-EINVAL if passed tunnel parameters are invalid, | |
1252 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1253 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1254 | **/ | |
1255 | ||
1256 | static int | |
3144581c | 1257 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1258 | { |
1259 | int err = 0; | |
1da177e4 LT |
1260 | struct ip6_tnl_parm p; |
1261 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1262 | struct net *net = dev_net(dev); |
1263 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1264 | |
1265 | switch (cmd) { | |
1266 | case SIOCGETTUNNEL: | |
15820e12 | 1267 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1268 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1269 | err = -EFAULT; |
1270 | break; | |
1271 | } | |
2dd02c89 | 1272 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1273 | } |
1274 | if (t == NULL) | |
2941a486 | 1275 | t = netdev_priv(dev); |
1da177e4 LT |
1276 | memcpy(&p, &t->parms, sizeof (p)); |
1277 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1278 | err = -EFAULT; | |
1279 | } | |
1280 | break; | |
1281 | case SIOCADDTUNNEL: | |
1282 | case SIOCCHGTUNNEL: | |
1283 | err = -EPERM; | |
1da177e4 LT |
1284 | if (!capable(CAP_NET_ADMIN)) |
1285 | break; | |
567131a7 VN |
1286 | err = -EFAULT; |
1287 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1288 | break; |
567131a7 | 1289 | err = -EINVAL; |
502b0935 YK |
1290 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1291 | p.proto != 0) | |
1da177e4 | 1292 | break; |
2dd02c89 | 1293 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1294 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1295 | if (t != NULL) { |
1296 | if (t->dev != dev) { | |
1297 | err = -EEXIST; | |
1298 | break; | |
1299 | } | |
1300 | } else | |
1301 | t = netdev_priv(dev); | |
1302 | ||
2dd02c89 | 1303 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1304 | synchronize_net(); |
3144581c | 1305 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1306 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1307 | netdev_state_change(dev); |
1308 | } | |
567131a7 | 1309 | if (t) { |
1da177e4 | 1310 | err = 0; |
567131a7 VN |
1311 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1312 | err = -EFAULT; | |
1313 | ||
1314 | } else | |
1315 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1316 | break; |
1317 | case SIOCDELTUNNEL: | |
1318 | err = -EPERM; | |
1319 | if (!capable(CAP_NET_ADMIN)) | |
1320 | break; | |
1321 | ||
15820e12 | 1322 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1323 | err = -EFAULT; |
1324 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1325 | break; |
567131a7 | 1326 | err = -ENOENT; |
2dd02c89 | 1327 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1328 | break; |
567131a7 | 1329 | err = -EPERM; |
15820e12 | 1330 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1331 | break; |
567131a7 | 1332 | dev = t->dev; |
1da177e4 | 1333 | } |
22f8cde5 SH |
1334 | err = 0; |
1335 | unregister_netdevice(dev); | |
1da177e4 LT |
1336 | break; |
1337 | default: | |
1338 | err = -EINVAL; | |
1339 | } | |
1340 | return err; | |
1341 | } | |
1342 | ||
1da177e4 | 1343 | /** |
3144581c | 1344 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1345 | * @dev: virtual device associated with tunnel |
1346 | * @new_mtu: the new mtu | |
1347 | * | |
1348 | * Return: | |
1349 | * 0 on success, | |
1350 | * %-EINVAL if mtu too small | |
1351 | **/ | |
1352 | ||
1353 | static int | |
3144581c | 1354 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1355 | { |
1356 | if (new_mtu < IPV6_MIN_MTU) { | |
1357 | return -EINVAL; | |
1358 | } | |
1359 | dev->mtu = new_mtu; | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1326c3d5 SH |
1363 | |
1364 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1365 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1366 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1367 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1368 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1369 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1370 | }; |
1371 | ||
8560f226 | 1372 | |
1da177e4 | 1373 | /** |
3144581c | 1374 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1375 | * @dev: virtual device associated with tunnel |
1376 | * | |
1377 | * Description: | |
1378 | * Initialize function pointers and device parameters | |
1379 | **/ | |
1380 | ||
3144581c | 1381 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1382 | { |
381601e5 AF |
1383 | struct ip6_tnl *t; |
1384 | ||
1326c3d5 | 1385 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1386 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1387 | |
1388 | dev->type = ARPHRD_TUNNEL6; | |
1389 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1390 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1391 | t = netdev_priv(dev); |
1392 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1393 | dev->mtu-=8; | |
1da177e4 LT |
1394 | dev->flags |= IFF_NOARP; |
1395 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1396 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1397 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | ||
1401 | /** | |
3144581c | 1402 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1403 | * @dev: virtual device associated with tunnel |
1404 | **/ | |
1405 | ||
8560f226 | 1406 | static inline int |
3144581c | 1407 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1408 | { |
2941a486 | 1409 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1410 | |
1da177e4 | 1411 | t->dev = dev; |
8560f226 ED |
1412 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1413 | if (!dev->tstats) | |
1414 | return -ENOMEM; | |
1415 | return 0; | |
1da177e4 LT |
1416 | } |
1417 | ||
1418 | /** | |
3144581c | 1419 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1420 | * @dev: virtual device associated with tunnel |
1421 | **/ | |
1422 | ||
8560f226 | 1423 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1424 | { |
2941a486 | 1425 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1426 | int err = ip6_tnl_dev_init_gen(dev); |
1427 | ||
1428 | if (err) | |
1429 | return err; | |
3144581c | 1430 | ip6_tnl_link_config(t); |
8560f226 | 1431 | return 0; |
1da177e4 LT |
1432 | } |
1433 | ||
1434 | /** | |
3144581c | 1435 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1436 | * @dev: fallback device |
1437 | * | |
1438 | * Return: 0 | |
1439 | **/ | |
1440 | ||
8560f226 | 1441 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1442 | { |
2941a486 | 1443 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1444 | struct net *net = dev_net(dev); |
1445 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1446 | int err = ip6_tnl_dev_init_gen(dev); |
1447 | ||
1448 | if (err) | |
1449 | return err; | |
3e6c9fb5 | 1450 | |
502b0935 | 1451 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1452 | dev_hold(dev); |
cf778b00 | 1453 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1454 | return 0; |
1da177e4 LT |
1455 | } |
1456 | ||
3ff2cfa5 | 1457 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1458 | .handler = ip4ip6_rcv, |
1459 | .err_handler = ip4ip6_err, | |
1460 | .priority = 1, | |
1461 | }; | |
1462 | ||
3ff2cfa5 | 1463 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1464 | .handler = ip6ip6_rcv, |
1465 | .err_handler = ip6ip6_err, | |
d2acc347 | 1466 | .priority = 1, |
1da177e4 LT |
1467 | }; |
1468 | ||
2c8c1e72 | 1469 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1470 | { |
1471 | int h; | |
1472 | struct ip6_tnl *t; | |
cf4432f5 | 1473 | LIST_HEAD(list); |
3e6c9fb5 PE |
1474 | |
1475 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1476 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1477 | while (t != NULL) { |
1478 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1479 | t = rtnl_dereference(t->next); |
cf4432f5 | 1480 | } |
3e6c9fb5 PE |
1481 | } |
1482 | ||
94767632 | 1483 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1484 | unregister_netdevice_queue(t->dev, &list); |
1485 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1486 | } |
1487 | ||
2c8c1e72 | 1488 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1489 | { |
ac31cd3c | 1490 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1491 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1492 | int err; |
13eeb8e9 | 1493 | |
3e6c9fb5 PE |
1494 | ip6n->tnls[0] = ip6n->tnls_wc; |
1495 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1496 | ||
15820e12 PE |
1497 | err = -ENOMEM; |
1498 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1499 | ip6_tnl_dev_setup); | |
1500 | ||
1501 | if (!ip6n->fb_tnl_dev) | |
1502 | goto err_alloc_dev; | |
be77e593 | 1503 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1504 | |
8560f226 ED |
1505 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1506 | if (err < 0) | |
1507 | goto err_register; | |
15820e12 PE |
1508 | |
1509 | err = register_netdev(ip6n->fb_tnl_dev); | |
1510 | if (err < 0) | |
1511 | goto err_register; | |
731abb9c JB |
1512 | |
1513 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1514 | ||
1515 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1516 | return 0; |
1517 | ||
15820e12 | 1518 | err_register: |
8560f226 | 1519 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1520 | err_alloc_dev: |
13eeb8e9 PE |
1521 | return err; |
1522 | } | |
1523 | ||
2c8c1e72 | 1524 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1525 | { |
ac31cd3c | 1526 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1527 | |
3e6c9fb5 PE |
1528 | rtnl_lock(); |
1529 | ip6_tnl_destroy_tunnels(ip6n); | |
1530 | rtnl_unlock(); | |
13eeb8e9 PE |
1531 | } |
1532 | ||
1533 | static struct pernet_operations ip6_tnl_net_ops = { | |
1534 | .init = ip6_tnl_init_net, | |
1535 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1536 | .id = &ip6_tnl_net_id, |
1537 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1538 | }; |
1539 | ||
1da177e4 LT |
1540 | /** |
1541 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1542 | * | |
1543 | * Return: 0 on success | |
1544 | **/ | |
1545 | ||
1546 | static int __init ip6_tunnel_init(void) | |
1547 | { | |
1548 | int err; | |
1549 | ||
d5aa407f AD |
1550 | err = register_pernet_device(&ip6_tnl_net_ops); |
1551 | if (err < 0) | |
1552 | goto out_pernet; | |
1553 | ||
1554 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1555 | if (err < 0) { | |
3144581c | 1556 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1557 | goto out_ip4ip6; |
c4d3efaf YK |
1558 | } |
1559 | ||
d5aa407f AD |
1560 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1561 | if (err < 0) { | |
3144581c | 1562 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1563 | goto out_ip6ip6; |
1da177e4 | 1564 | } |
13eeb8e9 | 1565 | |
1da177e4 | 1566 | return 0; |
d5aa407f AD |
1567 | |
1568 | out_ip6ip6: | |
c4d3efaf | 1569 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1570 | out_ip4ip6: |
1571 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1572 | out_pernet: | |
1da177e4 LT |
1573 | return err; |
1574 | } | |
1575 | ||
1576 | /** | |
1577 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1578 | **/ | |
1579 | ||
1580 | static void __exit ip6_tunnel_cleanup(void) | |
1581 | { | |
c4d3efaf | 1582 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1583 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1584 | |
73d605d1 | 1585 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1586 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1587 | |
ac31cd3c | 1588 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1589 | } |
1590 | ||
1591 | module_init(ip6_tunnel_init); | |
1592 | module_exit(ip6_tunnel_cleanup); |