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: | |
e87cc472 JP |
463 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
464 | t->parms.name); | |
1da177e4 LT |
465 | rel_msg = 1; |
466 | break; | |
467 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 468 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
469 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
470 | t->parms.name); | |
1da177e4 LT |
471 | rel_msg = 1; |
472 | } | |
473 | break; | |
474 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 475 | teli = 0; |
e490d1d8 | 476 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 477 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 478 | |
704eae1f | 479 | if (teli && teli == *info - 2) { |
1da177e4 LT |
480 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
481 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
482 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
483 | t->parms.name); | |
1da177e4 LT |
484 | rel_msg = 1; |
485 | } | |
e87cc472 JP |
486 | } else { |
487 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
488 | t->parms.name); | |
1da177e4 LT |
489 | } |
490 | break; | |
491 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 492 | mtu = *info - offset; |
1da177e4 LT |
493 | if (mtu < IPV6_MIN_MTU) |
494 | mtu = IPV6_MIN_MTU; | |
495 | t->dev->mtu = mtu; | |
496 | ||
cc6cdac0 | 497 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
498 | rel_type = ICMPV6_PKT_TOOBIG; |
499 | rel_code = 0; | |
500 | rel_info = mtu; | |
501 | rel_msg = 1; | |
502 | } | |
503 | break; | |
504 | } | |
e490d1d8 YK |
505 | |
506 | *type = rel_type; | |
507 | *code = rel_code; | |
508 | *info = rel_info; | |
509 | *msg = rel_msg; | |
510 | ||
511 | out: | |
2922bc8a | 512 | rcu_read_unlock(); |
e490d1d8 YK |
513 | return err; |
514 | } | |
515 | ||
c4d3efaf YK |
516 | static int |
517 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 518 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
519 | { |
520 | int rel_msg = 0; | |
d5fdd6ba BH |
521 | u8 rel_type = type; |
522 | u8 rel_code = code; | |
704eae1f | 523 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
524 | int err; |
525 | struct sk_buff *skb2; | |
b71d1d42 | 526 | const struct iphdr *eiph; |
c4d3efaf | 527 | struct rtable *rt; |
31e4543d | 528 | struct flowi4 fl4; |
c4d3efaf | 529 | |
502b0935 YK |
530 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
531 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
532 | if (err < 0) |
533 | return err; | |
534 | ||
535 | if (rel_msg == 0) | |
536 | return 0; | |
537 | ||
538 | switch (rel_type) { | |
539 | case ICMPV6_DEST_UNREACH: | |
540 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
541 | return 0; | |
542 | rel_type = ICMP_DEST_UNREACH; | |
543 | rel_code = ICMP_HOST_UNREACH; | |
544 | break; | |
545 | case ICMPV6_PKT_TOOBIG: | |
546 | if (rel_code != 0) | |
547 | return 0; | |
548 | rel_type = ICMP_DEST_UNREACH; | |
549 | rel_code = ICMP_FRAG_NEEDED; | |
550 | break; | |
551 | default: | |
552 | return 0; | |
553 | } | |
554 | ||
555 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
556 | return 0; | |
557 | ||
558 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
559 | if (!skb2) | |
560 | return 0; | |
561 | ||
adf30907 ED |
562 | skb_dst_drop(skb2); |
563 | ||
c4d3efaf | 564 | skb_pull(skb2, offset); |
c1d2bbe1 | 565 | skb_reset_network_header(skb2); |
eddc9ec5 | 566 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
567 | |
568 | /* Try to guess incoming interface */ | |
31e4543d | 569 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
570 | eiph->saddr, 0, |
571 | 0, 0, | |
572 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 573 | if (IS_ERR(rt)) |
c4d3efaf YK |
574 | goto out; |
575 | ||
d8d1f30b | 576 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
577 | |
578 | /* route "incoming" packet */ | |
579 | if (rt->rt_flags & RTCF_LOCAL) { | |
580 | ip_rt_put(rt); | |
581 | rt = NULL; | |
31e4543d | 582 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
583 | eiph->daddr, eiph->saddr, |
584 | 0, 0, | |
585 | IPPROTO_IPIP, | |
586 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 587 | if (IS_ERR(rt) || |
d8d1f30b | 588 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
589 | if (!IS_ERR(rt)) |
590 | ip_rt_put(rt); | |
c4d3efaf YK |
591 | goto out; |
592 | } | |
b23dd4fe | 593 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
594 | } else { |
595 | ip_rt_put(rt); | |
596 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
597 | skb2->dev) || | |
adf30907 | 598 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
599 | goto out; |
600 | } | |
601 | ||
602 | /* change mtu on this route */ | |
603 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 604 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
605 | goto out; |
606 | ||
adf30907 | 607 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
608 | } |
609 | ||
704eae1f | 610 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
611 | |
612 | out: | |
613 | kfree_skb(skb2); | |
614 | return 0; | |
615 | } | |
616 | ||
e490d1d8 YK |
617 | static int |
618 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 619 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
620 | { |
621 | int rel_msg = 0; | |
d5fdd6ba BH |
622 | u8 rel_type = type; |
623 | u8 rel_code = code; | |
704eae1f | 624 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
625 | int err; |
626 | ||
502b0935 YK |
627 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
628 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
629 | if (err < 0) |
630 | return err; | |
631 | ||
632 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
633 | struct rt6_info *rt; |
634 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 635 | |
1da177e4 | 636 | if (!skb2) |
e490d1d8 | 637 | return 0; |
1da177e4 | 638 | |
adf30907 | 639 | skb_dst_drop(skb2); |
1da177e4 | 640 | skb_pull(skb2, offset); |
c1d2bbe1 | 641 | skb_reset_network_header(skb2); |
1da177e4 LT |
642 | |
643 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
644 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
645 | NULL, 0, 0); | |
1da177e4 | 646 | |
d1918542 DM |
647 | if (rt && rt->dst.dev) |
648 | skb2->dev = rt->dst.dev; | |
1da177e4 | 649 | |
3ffe533c | 650 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
651 | |
652 | if (rt) | |
d8d1f30b | 653 | dst_release(&rt->dst); |
1da177e4 LT |
654 | |
655 | kfree_skb(skb2); | |
656 | } | |
e490d1d8 YK |
657 | |
658 | return 0; | |
1da177e4 LT |
659 | } |
660 | ||
b71d1d42 ED |
661 | static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
662 | const struct ipv6hdr *ipv6h, | |
c4d3efaf YK |
663 | struct sk_buff *skb) |
664 | { | |
665 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
666 | ||
667 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 668 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
669 | |
670 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 671 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
672 | } |
673 | ||
b71d1d42 ED |
674 | static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
675 | const struct ipv6hdr *ipv6h, | |
8359925b | 676 | struct sk_buff *skb) |
1da177e4 | 677 | { |
8359925b | 678 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 679 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 680 | |
8359925b | 681 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 682 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 683 | } |
8359925b | 684 | |
f1a28eab | 685 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
686 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
687 | { | |
688 | struct ip6_tnl_parm *p = &t->parms; | |
689 | int ret = 0; | |
2f7f54b7 | 690 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
691 | |
692 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 693 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
694 | |
695 | if (p->link) | |
f1a28eab | 696 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
697 | |
698 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
699 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
700 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
701 | ret = 1; |
702 | ||
09c6bbf0 VN |
703 | } |
704 | return ret; | |
705 | } | |
1da177e4 LT |
706 | |
707 | /** | |
3144581c | 708 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 709 | * @skb: received socket buffer |
8359925b YK |
710 | * @protocol: ethernet protocol ID |
711 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
712 | * |
713 | * Return: 0 | |
714 | **/ | |
715 | ||
8359925b | 716 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 717 | __u8 ipproto, |
b71d1d42 ED |
718 | void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
719 | const struct ipv6hdr *ipv6h, | |
8359925b | 720 | struct sk_buff *skb)) |
1da177e4 | 721 | { |
1da177e4 | 722 | struct ip6_tnl *t; |
b71d1d42 | 723 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 724 | |
2922bc8a | 725 | rcu_read_lock(); |
1da177e4 | 726 | |
8704ca7e | 727 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 728 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
729 | struct pcpu_tstats *tstats; |
730 | ||
502b0935 | 731 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 732 | rcu_read_unlock(); |
502b0935 YK |
733 | goto discard; |
734 | } | |
735 | ||
1da177e4 | 736 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 737 | rcu_read_unlock(); |
50fba2aa | 738 | goto discard; |
1da177e4 LT |
739 | } |
740 | ||
09c6bbf0 | 741 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 742 | t->dev->stats.rx_dropped++; |
2922bc8a | 743 | rcu_read_unlock(); |
1da177e4 LT |
744 | goto discard; |
745 | } | |
746 | secpath_reset(skb); | |
b0e380b1 | 747 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 748 | skb_reset_network_header(skb); |
8359925b | 749 | skb->protocol = htons(protocol); |
1da177e4 LT |
750 | skb->pkt_type = PACKET_HOST; |
751 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 752 | |
8560f226 ED |
753 | tstats = this_cpu_ptr(t->dev->tstats); |
754 | tstats->rx_packets++; | |
755 | tstats->rx_bytes += skb->len; | |
756 | ||
757 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 758 | |
d19d56dd | 759 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 760 | |
caf586e5 | 761 | netif_rx(skb); |
8990f468 | 762 | |
2922bc8a | 763 | rcu_read_unlock(); |
1da177e4 LT |
764 | return 0; |
765 | } | |
2922bc8a | 766 | rcu_read_unlock(); |
1da177e4 | 767 | return 1; |
50fba2aa HX |
768 | |
769 | discard: | |
770 | kfree_skb(skb); | |
771 | return 0; | |
1da177e4 LT |
772 | } |
773 | ||
c4d3efaf YK |
774 | static int ip4ip6_rcv(struct sk_buff *skb) |
775 | { | |
502b0935 YK |
776 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
777 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
778 | } |
779 | ||
8359925b YK |
780 | static int ip6ip6_rcv(struct sk_buff *skb) |
781 | { | |
502b0935 YK |
782 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
783 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
784 | } |
785 | ||
6fb32dde VN |
786 | struct ipv6_tel_txoption { |
787 | struct ipv6_txoptions ops; | |
788 | __u8 dst_opt[8]; | |
789 | }; | |
1da177e4 | 790 | |
6fb32dde VN |
791 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
792 | { | |
793 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 794 | |
6fb32dde VN |
795 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
796 | opt->dst_opt[3] = 1; | |
797 | opt->dst_opt[4] = encap_limit; | |
798 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
799 | opt->dst_opt[6] = 1; | |
1da177e4 | 800 | |
6fb32dde VN |
801 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
802 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
803 | } |
804 | ||
805 | /** | |
3144581c | 806 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 807 | * @t: the outgoing tunnel device |
1ab1457c | 808 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
809 | * |
810 | * Description: | |
1ab1457c | 811 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
812 | * doesn't match source of incoming packet. |
813 | * | |
1ab1457c | 814 | * Return: |
1da177e4 LT |
815 | * 1 if conflict, |
816 | * 0 else | |
817 | **/ | |
818 | ||
819 | static inline int | |
b71d1d42 | 820 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
821 | { |
822 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
823 | } | |
824 | ||
09c6bbf0 VN |
825 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
826 | { | |
827 | struct ip6_tnl_parm *p = &t->parms; | |
828 | int ret = 0; | |
2f7f54b7 | 829 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 830 | |
1ab1457c | 831 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
832 | struct net_device *ldev = NULL; |
833 | ||
f1a28eab | 834 | rcu_read_lock(); |
09c6bbf0 | 835 | if (p->link) |
f1a28eab | 836 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 837 | |
2f7f54b7 | 838 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
09c6bbf0 VN |
839 | printk(KERN_WARNING |
840 | "%s xmit: Local address not yet configured!\n", | |
841 | p->name); | |
842 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
2f7f54b7 | 843 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
09c6bbf0 VN |
844 | printk(KERN_WARNING |
845 | "%s xmit: Routing loop! " | |
846 | "Remote address found on this node!\n", | |
847 | p->name); | |
848 | else | |
849 | ret = 1; | |
f1a28eab | 850 | rcu_read_unlock(); |
09c6bbf0 VN |
851 | } |
852 | return ret; | |
853 | } | |
1da177e4 | 854 | /** |
61ec2aec | 855 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 856 | * @skb: the outgoing socket buffer |
1ab1457c | 857 | * @dev: the outgoing tunnel device |
61ec2aec YK |
858 | * @dsfield: dscp code for outer header |
859 | * @fl: flow of tunneled packet | |
860 | * @encap_limit: encapsulation limit | |
861 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
862 | * |
863 | * Description: | |
864 | * Build new header and do some sanity checks on the packet before sending | |
865 | * it. | |
866 | * | |
1ab1457c | 867 | * Return: |
c4d3efaf | 868 | * 0 on success |
61ec2aec YK |
869 | * -1 fail |
870 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
871 | **/ |
872 | ||
61ec2aec YK |
873 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
874 | struct net_device *dev, | |
875 | __u8 dsfield, | |
4c9483b2 | 876 | struct flowi6 *fl6, |
61ec2aec YK |
877 | int encap_limit, |
878 | __u32 *pmtu) | |
1da177e4 | 879 | { |
52479b62 | 880 | struct net *net = dev_net(dev); |
2941a486 | 881 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 882 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 883 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 884 | struct ipv6_tel_txoption opt; |
d24f22f3 | 885 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
886 | struct net_device *tdev; |
887 | int mtu; | |
c2636b4d | 888 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 889 | u8 proto; |
61ec2aec | 890 | int err = -1; |
1da177e4 | 891 | int pkt_len; |
1da177e4 | 892 | |
d24f22f3 ED |
893 | if (!fl6->flowi6_mark) |
894 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
895 | if (!dst) { |
896 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 897 | |
89b02126 | 898 | if (ndst->error) |
a57ebc90 | 899 | goto tx_err_link_failure; |
89b02126 ED |
900 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
901 | if (IS_ERR(ndst)) { | |
902 | err = PTR_ERR(ndst); | |
903 | ndst = NULL; | |
452edd59 DM |
904 | goto tx_err_link_failure; |
905 | } | |
89b02126 | 906 | dst = ndst; |
a57ebc90 | 907 | } |
1da177e4 LT |
908 | |
909 | tdev = dst->dev; | |
910 | ||
911 | if (tdev == dev) { | |
912 | stats->collisions++; | |
e87cc472 JP |
913 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
914 | t->parms.name); | |
1da177e4 LT |
915 | goto tx_err_dst_release; |
916 | } | |
917 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 918 | if (encap_limit >= 0) { |
1da177e4 LT |
919 | max_headroom += 8; |
920 | mtu -= 8; | |
921 | } | |
922 | if (mtu < IPV6_MIN_MTU) | |
923 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
924 | if (skb_dst(skb)) |
925 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 926 | if (skb->len > mtu) { |
61ec2aec YK |
927 | *pmtu = mtu; |
928 | err = -EMSGSIZE; | |
1da177e4 LT |
929 | goto tx_err_dst_release; |
930 | } | |
931 | ||
932 | /* | |
933 | * Okay, now see if we can stuff it in the buffer as-is. | |
934 | */ | |
935 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 936 | |
cfbba49d PM |
937 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
938 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 939 | struct sk_buff *new_skb; |
1ab1457c | 940 | |
1da177e4 LT |
941 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
942 | goto tx_err_dst_release; | |
943 | ||
944 | if (skb->sk) | |
945 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 946 | consume_skb(skb); |
1da177e4 LT |
947 | skb = new_skb; |
948 | } | |
adf30907 | 949 | skb_dst_drop(skb); |
d24f22f3 ED |
950 | if (fl6->flowi6_mark) { |
951 | skb_dst_set(skb, dst); | |
952 | ndst = NULL; | |
953 | } else { | |
954 | skb_dst_set_noref(skb, dst); | |
955 | } | |
b0e380b1 | 956 | skb->transport_header = skb->network_header; |
1da177e4 | 957 | |
4c9483b2 | 958 | proto = fl6->flowi6_proto; |
6fb32dde VN |
959 | if (encap_limit >= 0) { |
960 | init_tel_txopt(&opt, encap_limit); | |
961 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
962 | } | |
e2d1bca7 ACM |
963 | skb_push(skb, sizeof(struct ipv6hdr)); |
964 | skb_reset_network_header(skb); | |
0660e03f | 965 | ipv6h = ipv6_hdr(skb); |
4c9483b2 | 966 | *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000); |
1da177e4 LT |
967 | dsfield = INET_ECN_encapsulate(0, dsfield); |
968 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
969 | ipv6h->hop_limit = t->parms.hop_limit; |
970 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
971 | ipv6h->saddr = fl6->saddr; |
972 | ipv6h->daddr = fl6->daddr; | |
1da177e4 LT |
973 | nf_reset(skb); |
974 | pkt_len = skb->len; | |
ef76bc23 | 975 | err = ip6_local_out(skb); |
1da177e4 | 976 | |
b9df3cb8 | 977 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
978 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
979 | ||
980 | tstats->tx_bytes += pkt_len; | |
981 | tstats->tx_packets++; | |
1da177e4 LT |
982 | } else { |
983 | stats->tx_errors++; | |
984 | stats->tx_aborted_errors++; | |
985 | } | |
89b02126 ED |
986 | if (ndst) |
987 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
988 | return 0; |
989 | tx_err_link_failure: | |
990 | stats->tx_carrier_errors++; | |
991 | dst_link_failure(skb); | |
992 | tx_err_dst_release: | |
89b02126 | 993 | dst_release(ndst); |
61ec2aec YK |
994 | return err; |
995 | } | |
996 | ||
c4d3efaf YK |
997 | static inline int |
998 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
999 | { | |
1000 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1001 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1002 | int encap_limit = -1; |
4c9483b2 | 1003 | struct flowi6 fl6; |
c4d3efaf YK |
1004 | __u8 dsfield; |
1005 | __u32 mtu; | |
1006 | int err; | |
1007 | ||
502b0935 YK |
1008 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1009 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1010 | return -1; |
1011 | ||
1012 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1013 | encap_limit = t->parms.encap_limit; | |
1014 | ||
4c9483b2 DM |
1015 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1016 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1017 | |
1018 | dsfield = ipv4_get_dsfield(iph); | |
1019 | ||
d24f22f3 | 1020 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1021 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1022 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1023 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1024 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1025 | |
4c9483b2 | 1026 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1027 | if (err != 0) { |
1028 | /* XXX: send ICMP error even if DF is not set. */ | |
1029 | if (err == -EMSGSIZE) | |
1030 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1031 | htonl(mtu)); | |
1032 | return -1; | |
1033 | } | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
61ec2aec YK |
1038 | static inline int |
1039 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1040 | { | |
1041 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1042 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1043 | int encap_limit = -1; |
1044 | __u16 offset; | |
4c9483b2 | 1045 | struct flowi6 fl6; |
61ec2aec YK |
1046 | __u8 dsfield; |
1047 | __u32 mtu; | |
1048 | int err; | |
1049 | ||
502b0935 YK |
1050 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1051 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1052 | return -1; |
1053 | ||
d56f90a7 ACM |
1054 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1055 | if (offset > 0) { | |
61ec2aec | 1056 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1057 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1058 | if (tel->encap_limit == 0) { |
1059 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1060 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1061 | return -1; |
1062 | } | |
1063 | encap_limit = tel->encap_limit - 1; | |
1064 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1065 | encap_limit = t->parms.encap_limit; | |
1066 | ||
4c9483b2 DM |
1067 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1068 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1069 | |
1070 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1071 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1072 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1073 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1074 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1075 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1076 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1077 | |
4c9483b2 | 1078 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1079 | if (err != 0) { |
1080 | if (err == -EMSGSIZE) | |
3ffe533c | 1081 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1082 | return -1; |
1083 | } | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
6fef4c0c | 1088 | static netdev_tx_t |
61ec2aec YK |
1089 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1090 | { | |
1091 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1092 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1093 | int ret; |
1094 | ||
61ec2aec | 1095 | switch (skb->protocol) { |
60678040 | 1096 | case htons(ETH_P_IP): |
c4d3efaf YK |
1097 | ret = ip4ip6_tnl_xmit(skb, dev); |
1098 | break; | |
60678040 | 1099 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1100 | ret = ip6ip6_tnl_xmit(skb, dev); |
1101 | break; | |
1102 | default: | |
1103 | goto tx_err; | |
1104 | } | |
1105 | ||
1106 | if (ret < 0) | |
1107 | goto tx_err; | |
1108 | ||
6ed10654 | 1109 | return NETDEV_TX_OK; |
61ec2aec | 1110 | |
1da177e4 LT |
1111 | tx_err: |
1112 | stats->tx_errors++; | |
1113 | stats->tx_dropped++; | |
1114 | kfree_skb(skb); | |
6ed10654 | 1115 | return NETDEV_TX_OK; |
1da177e4 LT |
1116 | } |
1117 | ||
1118 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1119 | { | |
1120 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1121 | int ltype = ipv6_addr_type(&p->laddr); |
1122 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1123 | |
1124 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1125 | ||
09c6bbf0 VN |
1126 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1127 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1128 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1129 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1130 | if (ltype&IPV6_ADDR_UNICAST) |
1131 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1132 | if (rtype&IPV6_ADDR_UNICAST) | |
1133 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1134 | } |
1135 | } | |
1136 | ||
3144581c | 1137 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1138 | { |
1139 | struct net_device *dev = t->dev; | |
1140 | struct ip6_tnl_parm *p = &t->parms; | |
4c9483b2 | 1141 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1142 | |
3a6d54c5 JP |
1143 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1144 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1145 | |
1146 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1147 | fl6->saddr = p->laddr; |
1148 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1149 | fl6->flowi6_oif = p->link; |
1150 | fl6->flowlabel = 0; | |
1da177e4 LT |
1151 | |
1152 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1153 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1154 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1155 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 LT |
1156 | |
1157 | ip6_tnl_set_cap(t); | |
1158 | ||
1159 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1160 | dev->flags |= IFF_POINTOPOINT; | |
1161 | else | |
1162 | dev->flags &= ~IFF_POINTOPOINT; | |
1163 | ||
1164 | dev->iflink = p->link; | |
1165 | ||
1166 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1167 | int strict = (ipv6_addr_type(&p->raddr) & |
1168 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1169 | ||
2f7f54b7 PE |
1170 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1171 | &p->raddr, &p->laddr, | |
305d4b3c | 1172 | p->link, strict); |
1da177e4 LT |
1173 | |
1174 | if (rt == NULL) | |
1175 | return; | |
1176 | ||
d1918542 DM |
1177 | if (rt->dst.dev) { |
1178 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1179 | sizeof (struct ipv6hdr); |
1180 | ||
d1918542 | 1181 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1182 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1183 | dev->mtu-=8; | |
1da177e4 LT |
1184 | |
1185 | if (dev->mtu < IPV6_MIN_MTU) | |
1186 | dev->mtu = IPV6_MIN_MTU; | |
1187 | } | |
d8d1f30b | 1188 | dst_release(&rt->dst); |
1da177e4 LT |
1189 | } |
1190 | } | |
1191 | ||
1192 | /** | |
3144581c | 1193 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1194 | * @t: tunnel to be changed |
1195 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1196 | * |
1197 | * Description: | |
3144581c | 1198 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1199 | **/ |
1200 | ||
1201 | static int | |
3144581c | 1202 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 | 1203 | { |
4e3fd7a0 AD |
1204 | t->parms.laddr = p->laddr; |
1205 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1206 | t->parms.flags = p->flags; |
1207 | t->parms.hop_limit = p->hop_limit; | |
1208 | t->parms.encap_limit = p->encap_limit; | |
1209 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1210 | t->parms.link = p->link; |
502b0935 | 1211 | t->parms.proto = p->proto; |
0c088890 | 1212 | ip6_tnl_dst_reset(t); |
3144581c | 1213 | ip6_tnl_link_config(t); |
1da177e4 LT |
1214 | return 0; |
1215 | } | |
1216 | ||
1217 | /** | |
3144581c | 1218 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1219 | * @dev: virtual device associated with tunnel |
1220 | * @ifr: parameters passed from userspace | |
1221 | * @cmd: command to be performed | |
1222 | * | |
1223 | * Description: | |
3144581c | 1224 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1225 | * from userspace. |
1da177e4 LT |
1226 | * |
1227 | * The possible commands are the following: | |
1228 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1229 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1230 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1231 | * %SIOCDELTUNNEL: delete tunnel | |
1232 | * | |
1ab1457c | 1233 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1234 | * initialization, can be used for creating other tunnel devices. |
1235 | * | |
1236 | * Return: | |
1237 | * 0 on success, | |
1238 | * %-EFAULT if unable to copy data to or from userspace, | |
1239 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1240 | * %-EINVAL if passed tunnel parameters are invalid, | |
1241 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1242 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1243 | **/ | |
1244 | ||
1245 | static int | |
3144581c | 1246 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1247 | { |
1248 | int err = 0; | |
1da177e4 LT |
1249 | struct ip6_tnl_parm p; |
1250 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1251 | struct net *net = dev_net(dev); |
1252 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1253 | |
1254 | switch (cmd) { | |
1255 | case SIOCGETTUNNEL: | |
15820e12 | 1256 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1257 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1258 | err = -EFAULT; |
1259 | break; | |
1260 | } | |
2dd02c89 | 1261 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1262 | } |
1263 | if (t == NULL) | |
2941a486 | 1264 | t = netdev_priv(dev); |
1da177e4 LT |
1265 | memcpy(&p, &t->parms, sizeof (p)); |
1266 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1267 | err = -EFAULT; | |
1268 | } | |
1269 | break; | |
1270 | case SIOCADDTUNNEL: | |
1271 | case SIOCCHGTUNNEL: | |
1272 | err = -EPERM; | |
1da177e4 LT |
1273 | if (!capable(CAP_NET_ADMIN)) |
1274 | break; | |
567131a7 VN |
1275 | err = -EFAULT; |
1276 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1277 | break; |
567131a7 | 1278 | err = -EINVAL; |
502b0935 YK |
1279 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1280 | p.proto != 0) | |
1da177e4 | 1281 | break; |
2dd02c89 | 1282 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1283 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1284 | if (t != NULL) { |
1285 | if (t->dev != dev) { | |
1286 | err = -EEXIST; | |
1287 | break; | |
1288 | } | |
1289 | } else | |
1290 | t = netdev_priv(dev); | |
1291 | ||
2dd02c89 | 1292 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1293 | synchronize_net(); |
3144581c | 1294 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1295 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1296 | netdev_state_change(dev); |
1297 | } | |
567131a7 | 1298 | if (t) { |
1da177e4 | 1299 | err = 0; |
567131a7 VN |
1300 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1301 | err = -EFAULT; | |
1302 | ||
1303 | } else | |
1304 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1305 | break; |
1306 | case SIOCDELTUNNEL: | |
1307 | err = -EPERM; | |
1308 | if (!capable(CAP_NET_ADMIN)) | |
1309 | break; | |
1310 | ||
15820e12 | 1311 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1312 | err = -EFAULT; |
1313 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1314 | break; |
567131a7 | 1315 | err = -ENOENT; |
2dd02c89 | 1316 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1317 | break; |
567131a7 | 1318 | err = -EPERM; |
15820e12 | 1319 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1320 | break; |
567131a7 | 1321 | dev = t->dev; |
1da177e4 | 1322 | } |
22f8cde5 SH |
1323 | err = 0; |
1324 | unregister_netdevice(dev); | |
1da177e4 LT |
1325 | break; |
1326 | default: | |
1327 | err = -EINVAL; | |
1328 | } | |
1329 | return err; | |
1330 | } | |
1331 | ||
1da177e4 | 1332 | /** |
3144581c | 1333 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1334 | * @dev: virtual device associated with tunnel |
1335 | * @new_mtu: the new mtu | |
1336 | * | |
1337 | * Return: | |
1338 | * 0 on success, | |
1339 | * %-EINVAL if mtu too small | |
1340 | **/ | |
1341 | ||
1342 | static int | |
3144581c | 1343 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1344 | { |
1345 | if (new_mtu < IPV6_MIN_MTU) { | |
1346 | return -EINVAL; | |
1347 | } | |
1348 | dev->mtu = new_mtu; | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1326c3d5 SH |
1352 | |
1353 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1354 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1355 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1356 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1357 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1358 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1359 | }; |
1360 | ||
8560f226 | 1361 | |
1da177e4 | 1362 | /** |
3144581c | 1363 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1364 | * @dev: virtual device associated with tunnel |
1365 | * | |
1366 | * Description: | |
1367 | * Initialize function pointers and device parameters | |
1368 | **/ | |
1369 | ||
3144581c | 1370 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1371 | { |
381601e5 AF |
1372 | struct ip6_tnl *t; |
1373 | ||
1326c3d5 | 1374 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1375 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1376 | |
1377 | dev->type = ARPHRD_TUNNEL6; | |
1378 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1379 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1380 | t = netdev_priv(dev); |
1381 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1382 | dev->mtu-=8; | |
1da177e4 LT |
1383 | dev->flags |= IFF_NOARP; |
1384 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1385 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1386 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | ||
1390 | /** | |
3144581c | 1391 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1392 | * @dev: virtual device associated with tunnel |
1393 | **/ | |
1394 | ||
8560f226 | 1395 | static inline int |
3144581c | 1396 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1397 | { |
2941a486 | 1398 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1399 | |
1da177e4 | 1400 | t->dev = dev; |
8560f226 ED |
1401 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1402 | if (!dev->tstats) | |
1403 | return -ENOMEM; | |
1404 | return 0; | |
1da177e4 LT |
1405 | } |
1406 | ||
1407 | /** | |
3144581c | 1408 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1409 | * @dev: virtual device associated with tunnel |
1410 | **/ | |
1411 | ||
8560f226 | 1412 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1413 | { |
2941a486 | 1414 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1415 | int err = ip6_tnl_dev_init_gen(dev); |
1416 | ||
1417 | if (err) | |
1418 | return err; | |
3144581c | 1419 | ip6_tnl_link_config(t); |
8560f226 | 1420 | return 0; |
1da177e4 LT |
1421 | } |
1422 | ||
1423 | /** | |
3144581c | 1424 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1425 | * @dev: fallback device |
1426 | * | |
1427 | * Return: 0 | |
1428 | **/ | |
1429 | ||
8560f226 | 1430 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1431 | { |
2941a486 | 1432 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1433 | struct net *net = dev_net(dev); |
1434 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1435 | int err = ip6_tnl_dev_init_gen(dev); |
1436 | ||
1437 | if (err) | |
1438 | return err; | |
3e6c9fb5 | 1439 | |
502b0935 | 1440 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1441 | dev_hold(dev); |
cf778b00 | 1442 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1443 | return 0; |
1da177e4 LT |
1444 | } |
1445 | ||
3ff2cfa5 | 1446 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1447 | .handler = ip4ip6_rcv, |
1448 | .err_handler = ip4ip6_err, | |
1449 | .priority = 1, | |
1450 | }; | |
1451 | ||
3ff2cfa5 | 1452 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1453 | .handler = ip6ip6_rcv, |
1454 | .err_handler = ip6ip6_err, | |
d2acc347 | 1455 | .priority = 1, |
1da177e4 LT |
1456 | }; |
1457 | ||
2c8c1e72 | 1458 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1459 | { |
1460 | int h; | |
1461 | struct ip6_tnl *t; | |
cf4432f5 | 1462 | LIST_HEAD(list); |
3e6c9fb5 PE |
1463 | |
1464 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1465 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1466 | while (t != NULL) { |
1467 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1468 | t = rtnl_dereference(t->next); |
cf4432f5 | 1469 | } |
3e6c9fb5 PE |
1470 | } |
1471 | ||
94767632 | 1472 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1473 | unregister_netdevice_queue(t->dev, &list); |
1474 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1475 | } |
1476 | ||
2c8c1e72 | 1477 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1478 | { |
ac31cd3c | 1479 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1480 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1481 | int err; |
13eeb8e9 | 1482 | |
3e6c9fb5 PE |
1483 | ip6n->tnls[0] = ip6n->tnls_wc; |
1484 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1485 | ||
15820e12 PE |
1486 | err = -ENOMEM; |
1487 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1488 | ip6_tnl_dev_setup); | |
1489 | ||
1490 | if (!ip6n->fb_tnl_dev) | |
1491 | goto err_alloc_dev; | |
be77e593 | 1492 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1493 | |
8560f226 ED |
1494 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1495 | if (err < 0) | |
1496 | goto err_register; | |
15820e12 PE |
1497 | |
1498 | err = register_netdev(ip6n->fb_tnl_dev); | |
1499 | if (err < 0) | |
1500 | goto err_register; | |
731abb9c JB |
1501 | |
1502 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1503 | ||
1504 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1505 | return 0; |
1506 | ||
15820e12 | 1507 | err_register: |
8560f226 | 1508 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1509 | err_alloc_dev: |
13eeb8e9 PE |
1510 | return err; |
1511 | } | |
1512 | ||
2c8c1e72 | 1513 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1514 | { |
ac31cd3c | 1515 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1516 | |
3e6c9fb5 PE |
1517 | rtnl_lock(); |
1518 | ip6_tnl_destroy_tunnels(ip6n); | |
1519 | rtnl_unlock(); | |
13eeb8e9 PE |
1520 | } |
1521 | ||
1522 | static struct pernet_operations ip6_tnl_net_ops = { | |
1523 | .init = ip6_tnl_init_net, | |
1524 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1525 | .id = &ip6_tnl_net_id, |
1526 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1527 | }; |
1528 | ||
1da177e4 LT |
1529 | /** |
1530 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1531 | * | |
1532 | * Return: 0 on success | |
1533 | **/ | |
1534 | ||
1535 | static int __init ip6_tunnel_init(void) | |
1536 | { | |
1537 | int err; | |
1538 | ||
d5aa407f AD |
1539 | err = register_pernet_device(&ip6_tnl_net_ops); |
1540 | if (err < 0) | |
1541 | goto out_pernet; | |
1542 | ||
1543 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1544 | if (err < 0) { | |
3144581c | 1545 | printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); |
d5aa407f | 1546 | goto out_ip4ip6; |
c4d3efaf YK |
1547 | } |
1548 | ||
d5aa407f AD |
1549 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1550 | if (err < 0) { | |
3144581c | 1551 | printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); |
d5aa407f | 1552 | goto out_ip6ip6; |
1da177e4 | 1553 | } |
13eeb8e9 | 1554 | |
1da177e4 | 1555 | return 0; |
d5aa407f AD |
1556 | |
1557 | out_ip6ip6: | |
c4d3efaf | 1558 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1559 | out_ip4ip6: |
1560 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1561 | out_pernet: | |
1da177e4 LT |
1562 | return err; |
1563 | } | |
1564 | ||
1565 | /** | |
1566 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1567 | **/ | |
1568 | ||
1569 | static void __exit ip6_tunnel_cleanup(void) | |
1570 | { | |
c4d3efaf | 1571 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
3144581c | 1572 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); |
c4d3efaf | 1573 | |
73d605d1 | 1574 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
3144581c | 1575 | printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); |
1da177e4 | 1576 | |
ac31cd3c | 1577 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | module_init(ip6_tunnel_init); | |
1581 | module_exit(ip6_tunnel_cleanup); |