]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 | 8 | * |
1da177e4 | 9 | * Based on: |
c4d3efaf | 10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
11 | * |
12 | * RFC 2473 | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
f3213831 JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/if_tunnel.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/in6.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/if_arp.h> | |
37 | #include <linux/icmpv6.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/route.h> | |
40 | #include <linux/rtnetlink.h> | |
41 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
ddbe5032 | 43 | #include <linux/hash.h> |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
60063497 | 46 | #include <linux/atomic.h> |
1da177e4 | 47 | |
c4d3efaf | 48 | #include <net/icmp.h> |
1da177e4 LT |
49 | #include <net/ip.h> |
50 | #include <net/ipv6.h> | |
1da177e4 LT |
51 | #include <net/ip6_route.h> |
52 | #include <net/addrconf.h> | |
53 | #include <net/ip6_tunnel.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
56 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
57 | #include <net/net_namespace.h> |
58 | #include <net/netns/generic.h> | |
1da177e4 LT |
59 | |
60 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 61 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 62 | MODULE_LICENSE("GPL"); |
6dfbd87a | 63 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 64 | |
1da177e4 | 65 | #ifdef IP6_TNL_DEBUG |
91df42be | 66 | #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__) |
1da177e4 LT |
67 | #else |
68 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
69 | #endif | |
70 | ||
71 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 72 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 | 73 | |
ddbe5032 ED |
74 | #define HASH_SIZE_SHIFT 5 |
75 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 76 | |
ddbe5032 ED |
77 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
78 | { | |
79 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
80 | ||
81 | return hash_32(hash, HASH_SIZE_SHIFT); | |
82 | } | |
1da177e4 | 83 | |
8560f226 | 84 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 85 | static void ip6_tnl_dev_setup(struct net_device *dev); |
1da177e4 | 86 | |
f99189b1 | 87 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 88 | struct ip6_tnl_net { |
15820e12 PE |
89 | /* the IPv6 tunnel fallback device */ |
90 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 91 | /* lists for storing tunnels in use */ |
94767632 ED |
92 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
93 | struct ip6_tnl __rcu *tnls_wc[1]; | |
94 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
95 | }; |
96 | ||
8560f226 ED |
97 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
98 | struct pcpu_tstats { | |
99 | unsigned long rx_packets; | |
100 | unsigned long rx_bytes; | |
101 | unsigned long tx_packets; | |
102 | unsigned long tx_bytes; | |
8ce120f1 | 103 | } __attribute__((aligned(4*sizeof(unsigned long)))); |
8560f226 ED |
104 | |
105 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
106 | { | |
107 | struct pcpu_tstats sum = { 0 }; | |
108 | int i; | |
109 | ||
110 | for_each_possible_cpu(i) { | |
111 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
112 | ||
113 | sum.rx_packets += tstats->rx_packets; | |
114 | sum.rx_bytes += tstats->rx_bytes; | |
115 | sum.tx_packets += tstats->tx_packets; | |
116 | sum.tx_bytes += tstats->tx_bytes; | |
117 | } | |
118 | dev->stats.rx_packets = sum.rx_packets; | |
119 | dev->stats.rx_bytes = sum.rx_bytes; | |
120 | dev->stats.tx_packets = sum.tx_packets; | |
121 | dev->stats.tx_bytes = sum.tx_bytes; | |
122 | return &dev->stats; | |
123 | } | |
124 | ||
2922bc8a | 125 | /* |
94767632 | 126 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 127 | */ |
1da177e4 | 128 | |
c12b395a | 129 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
130 | { |
131 | struct dst_entry *dst = t->dst_cache; | |
132 | ||
1ab1457c | 133 | if (dst && dst->obsolete && |
1da177e4 LT |
134 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
135 | t->dst_cache = NULL; | |
136 | dst_release(dst); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | return dst; | |
141 | } | |
c12b395a | 142 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 143 | |
c12b395a | 144 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
145 | { |
146 | dst_release(t->dst_cache); | |
147 | t->dst_cache = NULL; | |
148 | } | |
c12b395a | 149 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 150 | |
c12b395a | 151 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
152 | { |
153 | struct rt6_info *rt = (struct rt6_info *) dst; | |
154 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
155 | dst_release(t->dst_cache); | |
156 | t->dst_cache = dst; | |
157 | } | |
c12b395a | 158 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
159 | |
160 | /** | |
3144581c | 161 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
162 | * @remote: the address of the tunnel exit-point |
163 | * @local: the address of the tunnel entry-point | |
1da177e4 | 164 | * |
1ab1457c | 165 | * Return: |
1da177e4 | 166 | * tunnel matching given end-points if found, |
1ab1457c | 167 | * else fallback tunnel if its device is up, |
1da177e4 LT |
168 | * else %NULL |
169 | **/ | |
170 | ||
2922bc8a ED |
171 | #define for_each_ip6_tunnel_rcu(start) \ |
172 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
173 | ||
1da177e4 | 174 | static struct ip6_tnl * |
b71d1d42 | 175 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 176 | { |
ddbe5032 | 177 | unsigned int hash = HASH(remote, local); |
1da177e4 | 178 | struct ip6_tnl *t; |
3e6c9fb5 | 179 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 180 | |
ddbe5032 | 181 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
182 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
183 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
184 | (t->dev->flags & IFF_UP)) | |
185 | return t; | |
186 | } | |
2922bc8a ED |
187 | t = rcu_dereference(ip6n->tnls_wc[0]); |
188 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
189 | return t; |
190 | ||
191 | return NULL; | |
192 | } | |
193 | ||
194 | /** | |
3144581c | 195 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 196 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
197 | * |
198 | * Description: | |
3144581c | 199 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
200 | * &struct in6_addr entries laddr and raddr in @p. |
201 | * | |
1ab1457c | 202 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
203 | **/ |
204 | ||
94767632 | 205 | static struct ip6_tnl __rcu ** |
c12b395a | 206 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 207 | { |
b71d1d42 ED |
208 | const struct in6_addr *remote = &p->raddr; |
209 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 210 | unsigned int h = 0; |
1da177e4 LT |
211 | int prio = 0; |
212 | ||
213 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
214 | prio = 1; | |
ddbe5032 | 215 | h = HASH(remote, local); |
1da177e4 | 216 | } |
3e6c9fb5 | 217 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
218 | } |
219 | ||
220 | /** | |
3144581c | 221 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
222 | * @t: tunnel to be added |
223 | **/ | |
224 | ||
225 | static void | |
2dd02c89 | 226 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 227 | { |
94767632 | 228 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 229 | |
cf778b00 ED |
230 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
231 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
232 | } |
233 | ||
234 | /** | |
3144581c | 235 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
236 | * @t: tunnel to be removed |
237 | **/ | |
238 | ||
239 | static void | |
2dd02c89 | 240 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 241 | { |
94767632 ED |
242 | struct ip6_tnl __rcu **tp; |
243 | struct ip6_tnl *iter; | |
244 | ||
245 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
246 | (iter = rtnl_dereference(*tp)) != NULL; | |
247 | tp = &iter->next) { | |
248 | if (t == iter) { | |
cf778b00 | 249 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
250 | break; |
251 | } | |
252 | } | |
253 | } | |
254 | ||
8560f226 ED |
255 | static void ip6_dev_free(struct net_device *dev) |
256 | { | |
257 | free_percpu(dev->tstats); | |
258 | free_netdev(dev); | |
259 | } | |
260 | ||
1da177e4 | 261 | /** |
2c53040f | 262 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
263 | * @p: tunnel parameters |
264 | * @pt: pointer to new tunnel | |
265 | * | |
266 | * Description: | |
267 | * Create tunnel matching given parameters. | |
1ab1457c YH |
268 | * |
269 | * Return: | |
567131a7 | 270 | * created tunnel or NULL |
1da177e4 LT |
271 | **/ |
272 | ||
c12b395a | 273 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
274 | { |
275 | struct net_device *dev; | |
276 | struct ip6_tnl *t; | |
277 | char name[IFNAMSIZ]; | |
278 | int err; | |
2dd02c89 | 279 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 280 | |
34cc7ba6 | 281 | if (p->name[0]) |
1da177e4 | 282 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
283 | else |
284 | sprintf(name, "ip6tnl%%d"); | |
285 | ||
3144581c | 286 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 287 | if (dev == NULL) |
567131a7 | 288 | goto failed; |
1da177e4 | 289 | |
554eb277 PE |
290 | dev_net_set(dev, net); |
291 | ||
2941a486 | 292 | t = netdev_priv(dev); |
1da177e4 | 293 | t->parms = *p; |
8560f226 ED |
294 | err = ip6_tnl_dev_init(dev); |
295 | if (err < 0) | |
296 | goto failed_free; | |
1da177e4 | 297 | |
b37d428b PE |
298 | if ((err = register_netdevice(dev)) < 0) |
299 | goto failed_free; | |
300 | ||
731abb9c JB |
301 | strcpy(t->parms.name, dev->name); |
302 | ||
1da177e4 | 303 | dev_hold(dev); |
2dd02c89 | 304 | ip6_tnl_link(ip6n, t); |
567131a7 | 305 | return t; |
b37d428b PE |
306 | |
307 | failed_free: | |
8560f226 | 308 | ip6_dev_free(dev); |
567131a7 VN |
309 | failed: |
310 | return NULL; | |
1da177e4 LT |
311 | } |
312 | ||
313 | /** | |
3144581c | 314 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 315 | * @p: tunnel parameters |
1da177e4 LT |
316 | * @create: != 0 if allowed to create new tunnel if no match found |
317 | * | |
318 | * Description: | |
3144581c | 319 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
320 | * based on @parms. If this is unsuccessful, but @create is set a new |
321 | * tunnel device is created and registered for use. | |
322 | * | |
323 | * Return: | |
567131a7 | 324 | * matching tunnel or NULL |
1da177e4 LT |
325 | **/ |
326 | ||
2dd02c89 | 327 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 328 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 329 | { |
b71d1d42 ED |
330 | const struct in6_addr *remote = &p->raddr; |
331 | const struct in6_addr *local = &p->laddr; | |
94767632 | 332 | struct ip6_tnl __rcu **tp; |
1da177e4 | 333 | struct ip6_tnl *t; |
2dd02c89 | 334 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 335 | |
94767632 ED |
336 | for (tp = ip6_tnl_bucket(ip6n, p); |
337 | (t = rtnl_dereference(*tp)) != NULL; | |
338 | tp = &t->next) { | |
1da177e4 | 339 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
340 | ipv6_addr_equal(remote, &t->parms.raddr)) |
341 | return t; | |
1da177e4 LT |
342 | } |
343 | if (!create) | |
567131a7 | 344 | return NULL; |
2dd02c89 | 345 | return ip6_tnl_create(net, p); |
1da177e4 LT |
346 | } |
347 | ||
348 | /** | |
3144581c | 349 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 350 | * @dev: the device to be destroyed |
1ab1457c | 351 | * |
1da177e4 | 352 | * Description: |
3144581c | 353 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
354 | **/ |
355 | ||
356 | static void | |
3144581c | 357 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 358 | { |
2941a486 | 359 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
360 | struct net *net = dev_net(dev); |
361 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 362 | |
94767632 | 363 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 364 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 365 | else |
2dd02c89 | 366 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
367 | ip6_tnl_dst_reset(t); |
368 | dev_put(dev); | |
369 | } | |
370 | ||
371 | /** | |
372 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
373 | * @skb: received socket buffer | |
374 | * | |
1ab1457c YH |
375 | * Return: |
376 | * 0 if none was found, | |
1da177e4 LT |
377 | * else index to encapsulation limit |
378 | **/ | |
379 | ||
c12b395a | 380 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 381 | { |
b71d1d42 | 382 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
383 | __u8 nexthdr = ipv6h->nexthdr; |
384 | __u16 off = sizeof (*ipv6h); | |
385 | ||
386 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
387 | __u16 optlen = 0; | |
388 | struct ipv6_opt_hdr *hdr; | |
389 | if (raw + off + sizeof (*hdr) > skb->data && | |
390 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
391 | break; | |
392 | ||
393 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
394 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
395 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
396 | if (frag_hdr->frag_off) | |
397 | break; | |
398 | optlen = 8; | |
399 | } else if (nexthdr == NEXTHDR_AUTH) { | |
400 | optlen = (hdr->hdrlen + 2) << 2; | |
401 | } else { | |
402 | optlen = ipv6_optlen(hdr); | |
403 | } | |
404 | if (nexthdr == NEXTHDR_DEST) { | |
405 | __u16 i = off + 2; | |
406 | while (1) { | |
407 | struct ipv6_tlv_tnl_enc_lim *tel; | |
408 | ||
409 | /* No more room for encapsulation limit */ | |
410 | if (i + sizeof (*tel) > off + optlen) | |
411 | break; | |
412 | ||
413 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
414 | /* return index of option if found and valid */ | |
415 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
416 | tel->length == 1) | |
417 | return i; | |
418 | /* else jump to next option */ | |
419 | if (tel->type) | |
420 | i += tel->length + 2; | |
421 | else | |
422 | i++; | |
423 | } | |
424 | } | |
425 | nexthdr = hdr->nexthdr; | |
426 | off += optlen; | |
427 | } | |
428 | return 0; | |
429 | } | |
c12b395a | 430 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
431 | |
432 | /** | |
e490d1d8 | 433 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
434 | * |
435 | * Description: | |
e490d1d8 | 436 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
437 | * to the specifications in RFC 2473. |
438 | **/ | |
439 | ||
d2acc347 | 440 | static int |
502b0935 | 441 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 442 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 443 | { |
b71d1d42 | 444 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
445 | struct ip6_tnl *t; |
446 | int rel_msg = 0; | |
d5fdd6ba BH |
447 | u8 rel_type = ICMPV6_DEST_UNREACH; |
448 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
449 | __u32 rel_info = 0; |
450 | __u16 len; | |
d2acc347 | 451 | int err = -ENOENT; |
1da177e4 | 452 | |
1ab1457c YH |
453 | /* If the packet doesn't contain the original IPv6 header we are |
454 | in trouble since we might need the source address for further | |
1da177e4 LT |
455 | processing of the error. */ |
456 | ||
2922bc8a | 457 | rcu_read_lock(); |
8704ca7e | 458 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 459 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
460 | goto out; |
461 | ||
502b0935 YK |
462 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
463 | goto out; | |
464 | ||
d2acc347 HX |
465 | err = 0; |
466 | ||
e490d1d8 | 467 | switch (*type) { |
1da177e4 LT |
468 | __u32 teli; |
469 | struct ipv6_tlv_tnl_enc_lim *tel; | |
470 | __u32 mtu; | |
471 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
472 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
473 | t->parms.name); | |
1da177e4 LT |
474 | rel_msg = 1; |
475 | break; | |
476 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 477 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
478 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
479 | t->parms.name); | |
1da177e4 LT |
480 | rel_msg = 1; |
481 | } | |
482 | break; | |
483 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 484 | teli = 0; |
e490d1d8 | 485 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 486 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 487 | |
704eae1f | 488 | if (teli && teli == *info - 2) { |
1da177e4 LT |
489 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
490 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
491 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
492 | t->parms.name); | |
1da177e4 LT |
493 | rel_msg = 1; |
494 | } | |
e87cc472 JP |
495 | } else { |
496 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
497 | 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; | |
ec18d9a2 DM |
560 | case NDISC_REDIRECT: |
561 | rel_type = ICMP_REDIRECT; | |
562 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
563 | default: |
564 | return 0; | |
565 | } | |
566 | ||
567 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
568 | return 0; | |
569 | ||
570 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
571 | if (!skb2) | |
572 | return 0; | |
573 | ||
adf30907 ED |
574 | skb_dst_drop(skb2); |
575 | ||
c4d3efaf | 576 | skb_pull(skb2, offset); |
c1d2bbe1 | 577 | skb_reset_network_header(skb2); |
eddc9ec5 | 578 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
579 | |
580 | /* Try to guess incoming interface */ | |
31e4543d | 581 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
582 | eiph->saddr, 0, |
583 | 0, 0, | |
584 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 585 | if (IS_ERR(rt)) |
c4d3efaf YK |
586 | goto out; |
587 | ||
d8d1f30b | 588 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
589 | |
590 | /* route "incoming" packet */ | |
591 | if (rt->rt_flags & RTCF_LOCAL) { | |
592 | ip_rt_put(rt); | |
593 | rt = NULL; | |
31e4543d | 594 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
595 | eiph->daddr, eiph->saddr, |
596 | 0, 0, | |
597 | IPPROTO_IPIP, | |
598 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 599 | if (IS_ERR(rt) || |
d8d1f30b | 600 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
601 | if (!IS_ERR(rt)) |
602 | ip_rt_put(rt); | |
c4d3efaf YK |
603 | goto out; |
604 | } | |
b23dd4fe | 605 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
606 | } else { |
607 | ip_rt_put(rt); | |
608 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
609 | skb2->dev) || | |
adf30907 | 610 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
611 | goto out; |
612 | } | |
613 | ||
614 | /* change mtu on this route */ | |
615 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 616 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
617 | goto out; |
618 | ||
6700c270 | 619 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 620 | } |
1ed5c48f | 621 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 622 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 623 | |
704eae1f | 624 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
625 | |
626 | out: | |
627 | kfree_skb(skb2); | |
628 | return 0; | |
629 | } | |
630 | ||
e490d1d8 YK |
631 | static int |
632 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 633 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
634 | { |
635 | int rel_msg = 0; | |
d5fdd6ba BH |
636 | u8 rel_type = type; |
637 | u8 rel_code = code; | |
704eae1f | 638 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
639 | int err; |
640 | ||
502b0935 YK |
641 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
642 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
643 | if (err < 0) |
644 | return err; | |
645 | ||
646 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
647 | struct rt6_info *rt; |
648 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 649 | |
1da177e4 | 650 | if (!skb2) |
e490d1d8 | 651 | return 0; |
1da177e4 | 652 | |
adf30907 | 653 | skb_dst_drop(skb2); |
1da177e4 | 654 | skb_pull(skb2, offset); |
c1d2bbe1 | 655 | skb_reset_network_header(skb2); |
1da177e4 LT |
656 | |
657 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
658 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
659 | NULL, 0, 0); | |
1da177e4 | 660 | |
d1918542 DM |
661 | if (rt && rt->dst.dev) |
662 | skb2->dev = rt->dst.dev; | |
1da177e4 | 663 | |
3ffe533c | 664 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
665 | |
666 | if (rt) | |
d8d1f30b | 667 | dst_release(&rt->dst); |
1da177e4 LT |
668 | |
669 | kfree_skb(skb2); | |
670 | } | |
e490d1d8 YK |
671 | |
672 | return 0; | |
1da177e4 LT |
673 | } |
674 | ||
b71d1d42 ED |
675 | static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
676 | const struct ipv6hdr *ipv6h, | |
c4d3efaf YK |
677 | struct sk_buff *skb) |
678 | { | |
679 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
680 | ||
681 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 682 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
683 | |
684 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 685 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
686 | } |
687 | ||
b71d1d42 ED |
688 | static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
689 | const struct ipv6hdr *ipv6h, | |
8359925b | 690 | struct sk_buff *skb) |
1da177e4 | 691 | { |
8359925b | 692 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 693 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 694 | |
8359925b | 695 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 696 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 697 | } |
8359925b | 698 | |
c12b395a | 699 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
700 | const struct in6_addr *laddr, |
701 | const struct in6_addr *raddr) | |
702 | { | |
c12b395a | 703 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
704 | int ltype = ipv6_addr_type(laddr); |
705 | int rtype = ipv6_addr_type(raddr); | |
706 | __u32 flags = 0; | |
707 | ||
708 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
709 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
710 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
711 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
712 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
713 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
714 | if (ltype&IPV6_ADDR_UNICAST) | |
715 | flags |= IP6_TNL_F_CAP_XMIT; | |
716 | if (rtype&IPV6_ADDR_UNICAST) | |
717 | flags |= IP6_TNL_F_CAP_RCV; | |
718 | } | |
719 | return flags; | |
720 | } | |
c12b395a | 721 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 722 | |
f1a28eab | 723 | /* called with rcu_read_lock() */ |
c12b395a | 724 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
725 | const struct in6_addr *laddr, |
726 | const struct in6_addr *raddr) | |
09c6bbf0 | 727 | { |
c12b395a | 728 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 729 | int ret = 0; |
2f7f54b7 | 730 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 731 | |
d0087b29 VN |
732 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
733 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
734 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 735 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
736 | |
737 | if (p->link) | |
f1a28eab | 738 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 739 | |
d0087b29 VN |
740 | if ((ipv6_addr_is_multicast(laddr) || |
741 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
742 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 743 | ret = 1; |
09c6bbf0 VN |
744 | } |
745 | return ret; | |
746 | } | |
c12b395a | 747 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
748 | |
749 | /** | |
3144581c | 750 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 751 | * @skb: received socket buffer |
8359925b YK |
752 | * @protocol: ethernet protocol ID |
753 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
754 | * |
755 | * Return: 0 | |
756 | **/ | |
757 | ||
8359925b | 758 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 759 | __u8 ipproto, |
b71d1d42 ED |
760 | void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
761 | const struct ipv6hdr *ipv6h, | |
8359925b | 762 | struct sk_buff *skb)) |
1da177e4 | 763 | { |
1da177e4 | 764 | struct ip6_tnl *t; |
b71d1d42 | 765 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 766 | |
2922bc8a | 767 | rcu_read_lock(); |
1da177e4 | 768 | |
8704ca7e | 769 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 770 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
771 | struct pcpu_tstats *tstats; |
772 | ||
502b0935 | 773 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 774 | rcu_read_unlock(); |
502b0935 YK |
775 | goto discard; |
776 | } | |
777 | ||
1da177e4 | 778 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 779 | rcu_read_unlock(); |
50fba2aa | 780 | goto discard; |
1da177e4 LT |
781 | } |
782 | ||
d0087b29 | 783 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 784 | t->dev->stats.rx_dropped++; |
2922bc8a | 785 | rcu_read_unlock(); |
1da177e4 LT |
786 | goto discard; |
787 | } | |
788 | secpath_reset(skb); | |
b0e380b1 | 789 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 790 | skb_reset_network_header(skb); |
8359925b | 791 | skb->protocol = htons(protocol); |
1da177e4 LT |
792 | skb->pkt_type = PACKET_HOST; |
793 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 794 | |
8560f226 ED |
795 | tstats = this_cpu_ptr(t->dev->tstats); |
796 | tstats->rx_packets++; | |
797 | tstats->rx_bytes += skb->len; | |
798 | ||
799 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 800 | |
d19d56dd | 801 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 802 | |
caf586e5 | 803 | netif_rx(skb); |
8990f468 | 804 | |
2922bc8a | 805 | rcu_read_unlock(); |
1da177e4 LT |
806 | return 0; |
807 | } | |
2922bc8a | 808 | rcu_read_unlock(); |
1da177e4 | 809 | return 1; |
50fba2aa HX |
810 | |
811 | discard: | |
812 | kfree_skb(skb); | |
813 | return 0; | |
1da177e4 LT |
814 | } |
815 | ||
c4d3efaf YK |
816 | static int ip4ip6_rcv(struct sk_buff *skb) |
817 | { | |
502b0935 YK |
818 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
819 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
820 | } |
821 | ||
8359925b YK |
822 | static int ip6ip6_rcv(struct sk_buff *skb) |
823 | { | |
502b0935 YK |
824 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
825 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
826 | } |
827 | ||
6fb32dde VN |
828 | struct ipv6_tel_txoption { |
829 | struct ipv6_txoptions ops; | |
830 | __u8 dst_opt[8]; | |
831 | }; | |
1da177e4 | 832 | |
6fb32dde VN |
833 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
834 | { | |
835 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 836 | |
6fb32dde VN |
837 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
838 | opt->dst_opt[3] = 1; | |
839 | opt->dst_opt[4] = encap_limit; | |
840 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
841 | opt->dst_opt[6] = 1; | |
1da177e4 | 842 | |
6fb32dde VN |
843 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
844 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
845 | } |
846 | ||
847 | /** | |
3144581c | 848 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 849 | * @t: the outgoing tunnel device |
1ab1457c | 850 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
851 | * |
852 | * Description: | |
1ab1457c | 853 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
854 | * doesn't match source of incoming packet. |
855 | * | |
1ab1457c | 856 | * Return: |
1da177e4 LT |
857 | * 1 if conflict, |
858 | * 0 else | |
859 | **/ | |
860 | ||
92113bfd | 861 | static inline bool |
b71d1d42 | 862 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
863 | { |
864 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
865 | } | |
866 | ||
c12b395a | 867 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 868 | { |
c12b395a | 869 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 870 | int ret = 0; |
2f7f54b7 | 871 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 872 | |
1ab1457c | 873 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
874 | struct net_device *ldev = NULL; |
875 | ||
f1a28eab | 876 | rcu_read_lock(); |
09c6bbf0 | 877 | if (p->link) |
f1a28eab | 878 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 879 | |
2f7f54b7 | 880 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
881 | pr_warn("%s xmit: Local address not yet configured!\n", |
882 | p->name); | |
09c6bbf0 | 883 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 884 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
885 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
886 | p->name); | |
09c6bbf0 VN |
887 | else |
888 | ret = 1; | |
f1a28eab | 889 | rcu_read_unlock(); |
09c6bbf0 VN |
890 | } |
891 | return ret; | |
892 | } | |
c12b395a | 893 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
894 | ||
1da177e4 | 895 | /** |
61ec2aec | 896 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 897 | * @skb: the outgoing socket buffer |
1ab1457c | 898 | * @dev: the outgoing tunnel device |
61ec2aec YK |
899 | * @dsfield: dscp code for outer header |
900 | * @fl: flow of tunneled packet | |
901 | * @encap_limit: encapsulation limit | |
902 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
903 | * |
904 | * Description: | |
905 | * Build new header and do some sanity checks on the packet before sending | |
906 | * it. | |
907 | * | |
1ab1457c | 908 | * Return: |
c4d3efaf | 909 | * 0 on success |
61ec2aec YK |
910 | * -1 fail |
911 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
912 | **/ |
913 | ||
61ec2aec YK |
914 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
915 | struct net_device *dev, | |
916 | __u8 dsfield, | |
4c9483b2 | 917 | struct flowi6 *fl6, |
61ec2aec YK |
918 | int encap_limit, |
919 | __u32 *pmtu) | |
1da177e4 | 920 | { |
52479b62 | 921 | struct net *net = dev_net(dev); |
2941a486 | 922 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 923 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 924 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 925 | struct ipv6_tel_txoption opt; |
d24f22f3 | 926 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
927 | struct net_device *tdev; |
928 | int mtu; | |
c2636b4d | 929 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 930 | u8 proto; |
61ec2aec | 931 | int err = -1; |
1da177e4 | 932 | int pkt_len; |
1da177e4 | 933 | |
d24f22f3 ED |
934 | if (!fl6->flowi6_mark) |
935 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
936 | if (!dst) { |
937 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 938 | |
89b02126 | 939 | if (ndst->error) |
a57ebc90 | 940 | goto tx_err_link_failure; |
89b02126 ED |
941 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
942 | if (IS_ERR(ndst)) { | |
943 | err = PTR_ERR(ndst); | |
944 | ndst = NULL; | |
452edd59 DM |
945 | goto tx_err_link_failure; |
946 | } | |
89b02126 | 947 | dst = ndst; |
a57ebc90 | 948 | } |
1da177e4 LT |
949 | |
950 | tdev = dst->dev; | |
951 | ||
952 | if (tdev == dev) { | |
953 | stats->collisions++; | |
e87cc472 JP |
954 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
955 | t->parms.name); | |
1da177e4 LT |
956 | goto tx_err_dst_release; |
957 | } | |
958 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 959 | if (encap_limit >= 0) { |
1da177e4 LT |
960 | max_headroom += 8; |
961 | mtu -= 8; | |
962 | } | |
963 | if (mtu < IPV6_MIN_MTU) | |
964 | mtu = IPV6_MIN_MTU; | |
adf30907 | 965 | if (skb_dst(skb)) |
6700c270 | 966 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 967 | if (skb->len > mtu) { |
61ec2aec YK |
968 | *pmtu = mtu; |
969 | err = -EMSGSIZE; | |
1da177e4 LT |
970 | goto tx_err_dst_release; |
971 | } | |
972 | ||
973 | /* | |
974 | * Okay, now see if we can stuff it in the buffer as-is. | |
975 | */ | |
976 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 977 | |
cfbba49d PM |
978 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
979 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 980 | struct sk_buff *new_skb; |
1ab1457c | 981 | |
1da177e4 LT |
982 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
983 | goto tx_err_dst_release; | |
984 | ||
985 | if (skb->sk) | |
986 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 987 | consume_skb(skb); |
1da177e4 LT |
988 | skb = new_skb; |
989 | } | |
adf30907 | 990 | skb_dst_drop(skb); |
d24f22f3 ED |
991 | if (fl6->flowi6_mark) { |
992 | skb_dst_set(skb, dst); | |
993 | ndst = NULL; | |
994 | } else { | |
995 | skb_dst_set_noref(skb, dst); | |
996 | } | |
b0e380b1 | 997 | skb->transport_header = skb->network_header; |
1da177e4 | 998 | |
4c9483b2 | 999 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1000 | if (encap_limit >= 0) { |
1001 | init_tel_txopt(&opt, encap_limit); | |
1002 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1003 | } | |
e2d1bca7 ACM |
1004 | skb_push(skb, sizeof(struct ipv6hdr)); |
1005 | skb_reset_network_header(skb); | |
0660e03f | 1006 | ipv6h = ipv6_hdr(skb); |
4c9483b2 | 1007 | *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000); |
1da177e4 LT |
1008 | dsfield = INET_ECN_encapsulate(0, dsfield); |
1009 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
1010 | ipv6h->hop_limit = t->parms.hop_limit; |
1011 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1012 | ipv6h->saddr = fl6->saddr; |
1013 | ipv6h->daddr = fl6->daddr; | |
1da177e4 LT |
1014 | nf_reset(skb); |
1015 | pkt_len = skb->len; | |
ef76bc23 | 1016 | err = ip6_local_out(skb); |
1da177e4 | 1017 | |
b9df3cb8 | 1018 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
1019 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
1020 | ||
1021 | tstats->tx_bytes += pkt_len; | |
1022 | tstats->tx_packets++; | |
1da177e4 LT |
1023 | } else { |
1024 | stats->tx_errors++; | |
1025 | stats->tx_aborted_errors++; | |
1026 | } | |
89b02126 ED |
1027 | if (ndst) |
1028 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1029 | return 0; |
1030 | tx_err_link_failure: | |
1031 | stats->tx_carrier_errors++; | |
1032 | dst_link_failure(skb); | |
1033 | tx_err_dst_release: | |
89b02126 | 1034 | dst_release(ndst); |
61ec2aec YK |
1035 | return err; |
1036 | } | |
1037 | ||
c4d3efaf YK |
1038 | static inline int |
1039 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1040 | { | |
1041 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1042 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1043 | int encap_limit = -1; |
4c9483b2 | 1044 | struct flowi6 fl6; |
c4d3efaf YK |
1045 | __u8 dsfield; |
1046 | __u32 mtu; | |
1047 | int err; | |
1048 | ||
502b0935 YK |
1049 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1050 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1051 | return -1; |
1052 | ||
1053 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1054 | encap_limit = t->parms.encap_limit; | |
1055 | ||
4c9483b2 DM |
1056 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1057 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1058 | |
1059 | dsfield = ipv4_get_dsfield(iph); | |
1060 | ||
d24f22f3 | 1061 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1062 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1063 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1064 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1065 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1066 | |
4c9483b2 | 1067 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1068 | if (err != 0) { |
1069 | /* XXX: send ICMP error even if DF is not set. */ | |
1070 | if (err == -EMSGSIZE) | |
1071 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1072 | htonl(mtu)); | |
1073 | return -1; | |
1074 | } | |
1075 | ||
1076 | return 0; | |
1077 | } | |
1078 | ||
61ec2aec YK |
1079 | static inline int |
1080 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1081 | { | |
1082 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1083 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1084 | int encap_limit = -1; |
1085 | __u16 offset; | |
4c9483b2 | 1086 | struct flowi6 fl6; |
61ec2aec YK |
1087 | __u8 dsfield; |
1088 | __u32 mtu; | |
1089 | int err; | |
1090 | ||
502b0935 YK |
1091 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1092 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1093 | return -1; |
1094 | ||
c12b395a | 1095 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1096 | if (offset > 0) { |
61ec2aec | 1097 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1098 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1099 | if (tel->encap_limit == 0) { |
1100 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1101 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1102 | return -1; |
1103 | } | |
1104 | encap_limit = tel->encap_limit - 1; | |
1105 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1106 | encap_limit = t->parms.encap_limit; | |
1107 | ||
4c9483b2 DM |
1108 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1109 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1110 | |
1111 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1112 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1113 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1114 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1115 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1116 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1117 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1118 | |
4c9483b2 | 1119 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1120 | if (err != 0) { |
1121 | if (err == -EMSGSIZE) | |
3ffe533c | 1122 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1123 | return -1; |
1124 | } | |
1125 | ||
1126 | return 0; | |
1127 | } | |
1128 | ||
6fef4c0c | 1129 | static netdev_tx_t |
61ec2aec YK |
1130 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1131 | { | |
1132 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1133 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1134 | int ret; |
1135 | ||
61ec2aec | 1136 | switch (skb->protocol) { |
60678040 | 1137 | case htons(ETH_P_IP): |
c4d3efaf YK |
1138 | ret = ip4ip6_tnl_xmit(skb, dev); |
1139 | break; | |
60678040 | 1140 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1141 | ret = ip6ip6_tnl_xmit(skb, dev); |
1142 | break; | |
1143 | default: | |
1144 | goto tx_err; | |
1145 | } | |
1146 | ||
1147 | if (ret < 0) | |
1148 | goto tx_err; | |
1149 | ||
6ed10654 | 1150 | return NETDEV_TX_OK; |
61ec2aec | 1151 | |
1da177e4 LT |
1152 | tx_err: |
1153 | stats->tx_errors++; | |
1154 | stats->tx_dropped++; | |
1155 | kfree_skb(skb); | |
6ed10654 | 1156 | return NETDEV_TX_OK; |
1da177e4 LT |
1157 | } |
1158 | ||
3144581c | 1159 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1160 | { |
1161 | struct net_device *dev = t->dev; | |
c12b395a | 1162 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1163 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1164 | |
3a6d54c5 JP |
1165 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1166 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1167 | |
1168 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1169 | fl6->saddr = p->laddr; |
1170 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1171 | fl6->flowi6_oif = p->link; |
1172 | fl6->flowlabel = 0; | |
1da177e4 LT |
1173 | |
1174 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1175 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1176 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1177 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1178 | |
d0087b29 VN |
1179 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1180 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1181 | |
1182 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1183 | dev->flags |= IFF_POINTOPOINT; | |
1184 | else | |
1185 | dev->flags &= ~IFF_POINTOPOINT; | |
1186 | ||
1187 | dev->iflink = p->link; | |
1188 | ||
1189 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1190 | int strict = (ipv6_addr_type(&p->raddr) & |
1191 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1192 | ||
2f7f54b7 PE |
1193 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1194 | &p->raddr, &p->laddr, | |
305d4b3c | 1195 | p->link, strict); |
1da177e4 LT |
1196 | |
1197 | if (rt == NULL) | |
1198 | return; | |
1199 | ||
d1918542 DM |
1200 | if (rt->dst.dev) { |
1201 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1202 | sizeof (struct ipv6hdr); |
1203 | ||
d1918542 | 1204 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1205 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1206 | dev->mtu-=8; | |
1da177e4 LT |
1207 | |
1208 | if (dev->mtu < IPV6_MIN_MTU) | |
1209 | dev->mtu = IPV6_MIN_MTU; | |
1210 | } | |
d8d1f30b | 1211 | dst_release(&rt->dst); |
1da177e4 LT |
1212 | } |
1213 | } | |
1214 | ||
1215 | /** | |
3144581c | 1216 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1217 | * @t: tunnel to be changed |
1218 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1219 | * |
1220 | * Description: | |
3144581c | 1221 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1222 | **/ |
1223 | ||
1224 | static int | |
c12b395a | 1225 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1226 | { |
4e3fd7a0 AD |
1227 | t->parms.laddr = p->laddr; |
1228 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1229 | t->parms.flags = p->flags; |
1230 | t->parms.hop_limit = p->hop_limit; | |
1231 | t->parms.encap_limit = p->encap_limit; | |
1232 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1233 | t->parms.link = p->link; |
502b0935 | 1234 | t->parms.proto = p->proto; |
0c088890 | 1235 | ip6_tnl_dst_reset(t); |
3144581c | 1236 | ip6_tnl_link_config(t); |
1da177e4 LT |
1237 | return 0; |
1238 | } | |
1239 | ||
c12b395a | 1240 | static void |
1241 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1242 | { | |
1243 | p->laddr = u->laddr; | |
1244 | p->raddr = u->raddr; | |
1245 | p->flags = u->flags; | |
1246 | p->hop_limit = u->hop_limit; | |
1247 | p->encap_limit = u->encap_limit; | |
1248 | p->flowinfo = u->flowinfo; | |
1249 | p->link = u->link; | |
1250 | p->proto = u->proto; | |
1251 | memcpy(p->name, u->name, sizeof(u->name)); | |
1252 | } | |
1253 | ||
1254 | static void | |
1255 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1256 | { | |
1257 | u->laddr = p->laddr; | |
1258 | u->raddr = p->raddr; | |
1259 | u->flags = p->flags; | |
1260 | u->hop_limit = p->hop_limit; | |
1261 | u->encap_limit = p->encap_limit; | |
1262 | u->flowinfo = p->flowinfo; | |
1263 | u->link = p->link; | |
1264 | u->proto = p->proto; | |
1265 | memcpy(u->name, p->name, sizeof(u->name)); | |
1266 | } | |
1267 | ||
1da177e4 | 1268 | /** |
3144581c | 1269 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1270 | * @dev: virtual device associated with tunnel |
1271 | * @ifr: parameters passed from userspace | |
1272 | * @cmd: command to be performed | |
1273 | * | |
1274 | * Description: | |
3144581c | 1275 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1276 | * from userspace. |
1da177e4 LT |
1277 | * |
1278 | * The possible commands are the following: | |
1279 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1280 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1281 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1282 | * %SIOCDELTUNNEL: delete tunnel | |
1283 | * | |
1ab1457c | 1284 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1285 | * initialization, can be used for creating other tunnel devices. |
1286 | * | |
1287 | * Return: | |
1288 | * 0 on success, | |
1289 | * %-EFAULT if unable to copy data to or from userspace, | |
1290 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1291 | * %-EINVAL if passed tunnel parameters are invalid, | |
1292 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1293 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1294 | **/ | |
1295 | ||
1296 | static int | |
3144581c | 1297 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1298 | { |
1299 | int err = 0; | |
1da177e4 | 1300 | struct ip6_tnl_parm p; |
c12b395a | 1301 | struct __ip6_tnl_parm p1; |
1da177e4 | 1302 | struct ip6_tnl *t = NULL; |
2dd02c89 PE |
1303 | struct net *net = dev_net(dev); |
1304 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1305 | |
1306 | switch (cmd) { | |
1307 | case SIOCGETTUNNEL: | |
15820e12 | 1308 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1309 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1310 | err = -EFAULT; |
1311 | break; | |
1312 | } | |
c12b395a | 1313 | ip6_tnl_parm_from_user(&p1, &p); |
1314 | t = ip6_tnl_locate(net, &p1, 0); | |
5ef5d6c5 DC |
1315 | } else { |
1316 | memset(&p, 0, sizeof(p)); | |
567131a7 VN |
1317 | } |
1318 | if (t == NULL) | |
2941a486 | 1319 | t = netdev_priv(dev); |
c12b395a | 1320 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1321 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1322 | err = -EFAULT; | |
1323 | } | |
1324 | break; | |
1325 | case SIOCADDTUNNEL: | |
1326 | case SIOCCHGTUNNEL: | |
1327 | err = -EPERM; | |
1da177e4 LT |
1328 | if (!capable(CAP_NET_ADMIN)) |
1329 | break; | |
567131a7 VN |
1330 | err = -EFAULT; |
1331 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1332 | break; |
567131a7 | 1333 | err = -EINVAL; |
502b0935 YK |
1334 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1335 | p.proto != 0) | |
1da177e4 | 1336 | break; |
c12b395a | 1337 | ip6_tnl_parm_from_user(&p1, &p); |
1338 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1339 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1340 | if (t != NULL) { |
1341 | if (t->dev != dev) { | |
1342 | err = -EEXIST; | |
1343 | break; | |
1344 | } | |
1345 | } else | |
1346 | t = netdev_priv(dev); | |
1347 | ||
2dd02c89 | 1348 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1349 | synchronize_net(); |
c12b395a | 1350 | err = ip6_tnl_change(t, &p1); |
2dd02c89 | 1351 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1352 | netdev_state_change(dev); |
1353 | } | |
567131a7 | 1354 | if (t) { |
1da177e4 | 1355 | err = 0; |
c12b395a | 1356 | ip6_tnl_parm_to_user(&p, &t->parms); |
1357 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1358 | err = -EFAULT; |
1359 | ||
1360 | } else | |
1361 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1362 | break; |
1363 | case SIOCDELTUNNEL: | |
1364 | err = -EPERM; | |
1365 | if (!capable(CAP_NET_ADMIN)) | |
1366 | break; | |
1367 | ||
15820e12 | 1368 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1369 | err = -EFAULT; |
1370 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1371 | break; |
567131a7 | 1372 | err = -ENOENT; |
c12b395a | 1373 | ip6_tnl_parm_from_user(&p1, &p); |
1374 | t = ip6_tnl_locate(net, &p1, 0); | |
1375 | if (t == NULL) | |
1da177e4 | 1376 | break; |
567131a7 | 1377 | err = -EPERM; |
15820e12 | 1378 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1379 | break; |
567131a7 | 1380 | dev = t->dev; |
1da177e4 | 1381 | } |
22f8cde5 SH |
1382 | err = 0; |
1383 | unregister_netdevice(dev); | |
1da177e4 LT |
1384 | break; |
1385 | default: | |
1386 | err = -EINVAL; | |
1387 | } | |
1388 | return err; | |
1389 | } | |
1390 | ||
1da177e4 | 1391 | /** |
3144581c | 1392 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1393 | * @dev: virtual device associated with tunnel |
1394 | * @new_mtu: the new mtu | |
1395 | * | |
1396 | * Return: | |
1397 | * 0 on success, | |
1398 | * %-EINVAL if mtu too small | |
1399 | **/ | |
1400 | ||
1401 | static int | |
3144581c | 1402 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1403 | { |
1404 | if (new_mtu < IPV6_MIN_MTU) { | |
1405 | return -EINVAL; | |
1406 | } | |
1407 | dev->mtu = new_mtu; | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1326c3d5 SH |
1411 | |
1412 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1413 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1414 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1415 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1416 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1417 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1418 | }; |
1419 | ||
8560f226 | 1420 | |
1da177e4 | 1421 | /** |
3144581c | 1422 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1423 | * @dev: virtual device associated with tunnel |
1424 | * | |
1425 | * Description: | |
1426 | * Initialize function pointers and device parameters | |
1427 | **/ | |
1428 | ||
3144581c | 1429 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1430 | { |
381601e5 AF |
1431 | struct ip6_tnl *t; |
1432 | ||
1326c3d5 | 1433 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1434 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1435 | |
1436 | dev->type = ARPHRD_TUNNEL6; | |
1437 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1438 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1439 | t = netdev_priv(dev); |
1440 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1441 | dev->mtu-=8; | |
1da177e4 LT |
1442 | dev->flags |= IFF_NOARP; |
1443 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1444 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1445 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1446 | } |
1447 | ||
1448 | ||
1449 | /** | |
3144581c | 1450 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1451 | * @dev: virtual device associated with tunnel |
1452 | **/ | |
1453 | ||
8560f226 | 1454 | static inline int |
3144581c | 1455 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1456 | { |
2941a486 | 1457 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1458 | |
1da177e4 | 1459 | t->dev = dev; |
8560f226 ED |
1460 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1461 | if (!dev->tstats) | |
1462 | return -ENOMEM; | |
1463 | return 0; | |
1da177e4 LT |
1464 | } |
1465 | ||
1466 | /** | |
3144581c | 1467 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1468 | * @dev: virtual device associated with tunnel |
1469 | **/ | |
1470 | ||
8560f226 | 1471 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1472 | { |
2941a486 | 1473 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1474 | int err = ip6_tnl_dev_init_gen(dev); |
1475 | ||
1476 | if (err) | |
1477 | return err; | |
3144581c | 1478 | ip6_tnl_link_config(t); |
8560f226 | 1479 | return 0; |
1da177e4 LT |
1480 | } |
1481 | ||
1482 | /** | |
3144581c | 1483 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1484 | * @dev: fallback device |
1485 | * | |
1486 | * Return: 0 | |
1487 | **/ | |
1488 | ||
8560f226 | 1489 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1490 | { |
2941a486 | 1491 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1492 | struct net *net = dev_net(dev); |
1493 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1494 | int err = ip6_tnl_dev_init_gen(dev); |
1495 | ||
1496 | if (err) | |
1497 | return err; | |
3e6c9fb5 | 1498 | |
502b0935 | 1499 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1500 | dev_hold(dev); |
d0087b29 VN |
1501 | |
1502 | ip6_tnl_link_config(t); | |
1503 | ||
cf778b00 | 1504 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1505 | return 0; |
1da177e4 LT |
1506 | } |
1507 | ||
3ff2cfa5 | 1508 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1509 | .handler = ip4ip6_rcv, |
1510 | .err_handler = ip4ip6_err, | |
1511 | .priority = 1, | |
1512 | }; | |
1513 | ||
3ff2cfa5 | 1514 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1515 | .handler = ip6ip6_rcv, |
1516 | .err_handler = ip6ip6_err, | |
d2acc347 | 1517 | .priority = 1, |
1da177e4 LT |
1518 | }; |
1519 | ||
2c8c1e72 | 1520 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1521 | { |
1522 | int h; | |
1523 | struct ip6_tnl *t; | |
cf4432f5 | 1524 | LIST_HEAD(list); |
3e6c9fb5 PE |
1525 | |
1526 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1527 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1528 | while (t != NULL) { |
1529 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1530 | t = rtnl_dereference(t->next); |
cf4432f5 | 1531 | } |
3e6c9fb5 PE |
1532 | } |
1533 | ||
94767632 | 1534 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1535 | unregister_netdevice_queue(t->dev, &list); |
1536 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1537 | } |
1538 | ||
2c8c1e72 | 1539 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1540 | { |
ac31cd3c | 1541 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1542 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1543 | int err; |
13eeb8e9 | 1544 | |
3e6c9fb5 PE |
1545 | ip6n->tnls[0] = ip6n->tnls_wc; |
1546 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1547 | ||
15820e12 PE |
1548 | err = -ENOMEM; |
1549 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1550 | ip6_tnl_dev_setup); | |
1551 | ||
1552 | if (!ip6n->fb_tnl_dev) | |
1553 | goto err_alloc_dev; | |
be77e593 | 1554 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1555 | |
8560f226 ED |
1556 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1557 | if (err < 0) | |
1558 | goto err_register; | |
15820e12 PE |
1559 | |
1560 | err = register_netdev(ip6n->fb_tnl_dev); | |
1561 | if (err < 0) | |
1562 | goto err_register; | |
731abb9c JB |
1563 | |
1564 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1565 | ||
1566 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1567 | return 0; |
1568 | ||
15820e12 | 1569 | err_register: |
8560f226 | 1570 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1571 | err_alloc_dev: |
13eeb8e9 PE |
1572 | return err; |
1573 | } | |
1574 | ||
2c8c1e72 | 1575 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1576 | { |
ac31cd3c | 1577 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1578 | |
3e6c9fb5 PE |
1579 | rtnl_lock(); |
1580 | ip6_tnl_destroy_tunnels(ip6n); | |
1581 | rtnl_unlock(); | |
13eeb8e9 PE |
1582 | } |
1583 | ||
1584 | static struct pernet_operations ip6_tnl_net_ops = { | |
1585 | .init = ip6_tnl_init_net, | |
1586 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1587 | .id = &ip6_tnl_net_id, |
1588 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1589 | }; |
1590 | ||
1da177e4 LT |
1591 | /** |
1592 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1593 | * | |
1594 | * Return: 0 on success | |
1595 | **/ | |
1596 | ||
1597 | static int __init ip6_tunnel_init(void) | |
1598 | { | |
1599 | int err; | |
1600 | ||
d5aa407f AD |
1601 | err = register_pernet_device(&ip6_tnl_net_ops); |
1602 | if (err < 0) | |
1603 | goto out_pernet; | |
1604 | ||
1605 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1606 | if (err < 0) { | |
f3213831 | 1607 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1608 | goto out_ip4ip6; |
c4d3efaf YK |
1609 | } |
1610 | ||
d5aa407f AD |
1611 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1612 | if (err < 0) { | |
f3213831 | 1613 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1614 | goto out_ip6ip6; |
1da177e4 | 1615 | } |
13eeb8e9 | 1616 | |
1da177e4 | 1617 | return 0; |
d5aa407f AD |
1618 | |
1619 | out_ip6ip6: | |
c4d3efaf | 1620 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1621 | out_ip4ip6: |
1622 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1623 | out_pernet: | |
1da177e4 LT |
1624 | return err; |
1625 | } | |
1626 | ||
1627 | /** | |
1628 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1629 | **/ | |
1630 | ||
1631 | static void __exit ip6_tunnel_cleanup(void) | |
1632 | { | |
c4d3efaf | 1633 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1634 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1635 | |
73d605d1 | 1636 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1637 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1638 | |
ac31cd3c | 1639 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | module_init(ip6_tunnel_init); | |
1643 | module_exit(ip6_tunnel_cleanup); |