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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> |
1da177e4 LT |
43 | |
44 | #include <asm/uaccess.h> | |
60063497 | 45 | #include <linux/atomic.h> |
1da177e4 | 46 | |
c4d3efaf | 47 | #include <net/icmp.h> |
1da177e4 LT |
48 | #include <net/ip.h> |
49 | #include <net/ipv6.h> | |
1da177e4 LT |
50 | #include <net/ip6_route.h> |
51 | #include <net/addrconf.h> | |
52 | #include <net/ip6_tunnel.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/dsfield.h> | |
55 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
56 | #include <net/net_namespace.h> |
57 | #include <net/netns/generic.h> | |
1da177e4 LT |
58 | |
59 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 60 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 61 | MODULE_LICENSE("GPL"); |
6dfbd87a | 62 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 63 | |
1da177e4 | 64 | #ifdef IP6_TNL_DEBUG |
0dc47877 | 65 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) |
1da177e4 LT |
66 | #else |
67 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
68 | #endif | |
69 | ||
70 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 71 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 LT |
72 | |
73 | #define HASH_SIZE 32 | |
74 | ||
e69a4adc | 75 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
76 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
77 | (HASH_SIZE - 1)) | |
1da177e4 | 78 | |
8560f226 | 79 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 80 | static void ip6_tnl_dev_setup(struct net_device *dev); |
1da177e4 | 81 | |
f99189b1 | 82 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 83 | struct ip6_tnl_net { |
15820e12 PE |
84 | /* the IPv6 tunnel fallback device */ |
85 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 86 | /* lists for storing tunnels in use */ |
94767632 ED |
87 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
88 | struct ip6_tnl __rcu *tnls_wc[1]; | |
89 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
90 | }; |
91 | ||
8560f226 ED |
92 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
93 | struct pcpu_tstats { | |
94 | unsigned long rx_packets; | |
95 | unsigned long rx_bytes; | |
96 | unsigned long tx_packets; | |
97 | unsigned long tx_bytes; | |
8ce120f1 | 98 | } __attribute__((aligned(4*sizeof(unsigned long)))); |
8560f226 ED |
99 | |
100 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
101 | { | |
102 | struct pcpu_tstats sum = { 0 }; | |
103 | int i; | |
104 | ||
105 | for_each_possible_cpu(i) { | |
106 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
107 | ||
108 | sum.rx_packets += tstats->rx_packets; | |
109 | sum.rx_bytes += tstats->rx_bytes; | |
110 | sum.tx_packets += tstats->tx_packets; | |
111 | sum.tx_bytes += tstats->tx_bytes; | |
112 | } | |
113 | dev->stats.rx_packets = sum.rx_packets; | |
114 | dev->stats.rx_bytes = sum.rx_bytes; | |
115 | dev->stats.tx_packets = sum.tx_packets; | |
116 | dev->stats.tx_bytes = sum.tx_bytes; | |
117 | return &dev->stats; | |
118 | } | |
119 | ||
2922bc8a | 120 | /* |
94767632 | 121 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 122 | */ |
1da177e4 LT |
123 | |
124 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
125 | { | |
126 | struct dst_entry *dst = t->dst_cache; | |
127 | ||
1ab1457c | 128 | if (dst && dst->obsolete && |
1da177e4 LT |
129 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
130 | t->dst_cache = NULL; | |
131 | dst_release(dst); | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | return dst; | |
136 | } | |
137 | ||
138 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
139 | { | |
140 | dst_release(t->dst_cache); | |
141 | t->dst_cache = NULL; | |
142 | } | |
143 | ||
144 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
145 | { | |
146 | struct rt6_info *rt = (struct rt6_info *) dst; | |
147 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
148 | dst_release(t->dst_cache); | |
149 | t->dst_cache = dst; | |
150 | } | |
151 | ||
152 | /** | |
3144581c | 153 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
154 | * @remote: the address of the tunnel exit-point |
155 | * @local: the address of the tunnel entry-point | |
1da177e4 | 156 | * |
1ab1457c | 157 | * Return: |
1da177e4 | 158 | * tunnel matching given end-points if found, |
1ab1457c | 159 | * else fallback tunnel if its device is up, |
1da177e4 LT |
160 | * else %NULL |
161 | **/ | |
162 | ||
2922bc8a ED |
163 | #define for_each_ip6_tunnel_rcu(start) \ |
164 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
165 | ||
1da177e4 | 166 | static struct ip6_tnl * |
b71d1d42 | 167 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 168 | { |
94767632 ED |
169 | unsigned int h0 = HASH(remote); |
170 | unsigned int h1 = HASH(local); | |
1da177e4 | 171 | struct ip6_tnl *t; |
3e6c9fb5 | 172 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 173 | |
2922bc8a | 174 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { |
1da177e4 LT |
175 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
176 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
177 | (t->dev->flags & IFF_UP)) | |
178 | return t; | |
179 | } | |
2922bc8a ED |
180 | t = rcu_dereference(ip6n->tnls_wc[0]); |
181 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
182 | return t; |
183 | ||
184 | return NULL; | |
185 | } | |
186 | ||
187 | /** | |
3144581c | 188 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 189 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
190 | * |
191 | * Description: | |
3144581c | 192 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
193 | * &struct in6_addr entries laddr and raddr in @p. |
194 | * | |
1ab1457c | 195 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
196 | **/ |
197 | ||
94767632 | 198 | static struct ip6_tnl __rcu ** |
b71d1d42 | 199 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p) |
1da177e4 | 200 | { |
b71d1d42 ED |
201 | const struct in6_addr *remote = &p->raddr; |
202 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 203 | unsigned int h = 0; |
1da177e4 LT |
204 | int prio = 0; |
205 | ||
206 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
207 | prio = 1; | |
208 | h = HASH(remote) ^ HASH(local); | |
209 | } | |
3e6c9fb5 | 210 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
211 | } |
212 | ||
213 | /** | |
3144581c | 214 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
215 | * @t: tunnel to be added |
216 | **/ | |
217 | ||
218 | static void | |
2dd02c89 | 219 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 220 | { |
94767632 | 221 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 222 | |
cf778b00 ED |
223 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
224 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
225 | } |
226 | ||
227 | /** | |
3144581c | 228 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
229 | * @t: tunnel to be removed |
230 | **/ | |
231 | ||
232 | static void | |
2dd02c89 | 233 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 234 | { |
94767632 ED |
235 | struct ip6_tnl __rcu **tp; |
236 | struct ip6_tnl *iter; | |
237 | ||
238 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
239 | (iter = rtnl_dereference(*tp)) != NULL; | |
240 | tp = &iter->next) { | |
241 | if (t == iter) { | |
cf778b00 | 242 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
243 | break; |
244 | } | |
245 | } | |
246 | } | |
247 | ||
8560f226 ED |
248 | static void ip6_dev_free(struct net_device *dev) |
249 | { | |
250 | free_percpu(dev->tstats); | |
251 | free_netdev(dev); | |
252 | } | |
253 | ||
1da177e4 LT |
254 | /** |
255 | * ip6_tnl_create() - create a new tunnel | |
256 | * @p: tunnel parameters | |
257 | * @pt: pointer to new tunnel | |
258 | * | |
259 | * Description: | |
260 | * Create tunnel matching given parameters. | |
1ab1457c YH |
261 | * |
262 | * Return: | |
567131a7 | 263 | * created tunnel or NULL |
1da177e4 LT |
264 | **/ |
265 | ||
2dd02c89 | 266 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) |
1da177e4 LT |
267 | { |
268 | struct net_device *dev; | |
269 | struct ip6_tnl *t; | |
270 | char name[IFNAMSIZ]; | |
271 | int err; | |
2dd02c89 | 272 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 273 | |
34cc7ba6 | 274 | if (p->name[0]) |
1da177e4 | 275 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
276 | else |
277 | sprintf(name, "ip6tnl%%d"); | |
278 | ||
3144581c | 279 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 280 | if (dev == NULL) |
567131a7 | 281 | goto failed; |
1da177e4 | 282 | |
554eb277 PE |
283 | dev_net_set(dev, net); |
284 | ||
2941a486 | 285 | t = netdev_priv(dev); |
1da177e4 | 286 | t->parms = *p; |
8560f226 ED |
287 | err = ip6_tnl_dev_init(dev); |
288 | if (err < 0) | |
289 | goto failed_free; | |
1da177e4 | 290 | |
b37d428b PE |
291 | if ((err = register_netdevice(dev)) < 0) |
292 | goto failed_free; | |
293 | ||
731abb9c JB |
294 | strcpy(t->parms.name, dev->name); |
295 | ||
1da177e4 | 296 | dev_hold(dev); |
2dd02c89 | 297 | ip6_tnl_link(ip6n, t); |
567131a7 | 298 | return t; |
b37d428b PE |
299 | |
300 | failed_free: | |
8560f226 | 301 | ip6_dev_free(dev); |
567131a7 VN |
302 | failed: |
303 | return NULL; | |
1da177e4 LT |
304 | } |
305 | ||
306 | /** | |
3144581c | 307 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 308 | * @p: tunnel parameters |
1da177e4 LT |
309 | * @create: != 0 if allowed to create new tunnel if no match found |
310 | * | |
311 | * Description: | |
3144581c | 312 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
313 | * based on @parms. If this is unsuccessful, but @create is set a new |
314 | * tunnel device is created and registered for use. | |
315 | * | |
316 | * Return: | |
567131a7 | 317 | * matching tunnel or NULL |
1da177e4 LT |
318 | **/ |
319 | ||
2dd02c89 PE |
320 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
321 | struct ip6_tnl_parm *p, int create) | |
1da177e4 | 322 | { |
b71d1d42 ED |
323 | const struct in6_addr *remote = &p->raddr; |
324 | const struct in6_addr *local = &p->laddr; | |
94767632 | 325 | struct ip6_tnl __rcu **tp; |
1da177e4 | 326 | struct ip6_tnl *t; |
2dd02c89 | 327 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 328 | |
94767632 ED |
329 | for (tp = ip6_tnl_bucket(ip6n, p); |
330 | (t = rtnl_dereference(*tp)) != NULL; | |
331 | tp = &t->next) { | |
1da177e4 | 332 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
333 | ipv6_addr_equal(remote, &t->parms.raddr)) |
334 | return t; | |
1da177e4 LT |
335 | } |
336 | if (!create) | |
567131a7 | 337 | return NULL; |
2dd02c89 | 338 | return ip6_tnl_create(net, p); |
1da177e4 LT |
339 | } |
340 | ||
341 | /** | |
3144581c | 342 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 343 | * @dev: the device to be destroyed |
1ab1457c | 344 | * |
1da177e4 | 345 | * Description: |
3144581c | 346 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
347 | **/ |
348 | ||
349 | static void | |
3144581c | 350 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 351 | { |
2941a486 | 352 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
353 | struct net *net = dev_net(dev); |
354 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 355 | |
94767632 | 356 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 357 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 358 | else |
2dd02c89 | 359 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
360 | ip6_tnl_dst_reset(t); |
361 | dev_put(dev); | |
362 | } | |
363 | ||
364 | /** | |
365 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
366 | * @skb: received socket buffer | |
367 | * | |
1ab1457c YH |
368 | * Return: |
369 | * 0 if none was found, | |
1da177e4 LT |
370 | * else index to encapsulation limit |
371 | **/ | |
372 | ||
373 | static __u16 | |
374 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
375 | { | |
b71d1d42 | 376 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
377 | __u8 nexthdr = ipv6h->nexthdr; |
378 | __u16 off = sizeof (*ipv6h); | |
379 | ||
380 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
381 | __u16 optlen = 0; | |
382 | struct ipv6_opt_hdr *hdr; | |
383 | if (raw + off + sizeof (*hdr) > skb->data && | |
384 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
385 | break; | |
386 | ||
387 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
388 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
389 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
390 | if (frag_hdr->frag_off) | |
391 | break; | |
392 | optlen = 8; | |
393 | } else if (nexthdr == NEXTHDR_AUTH) { | |
394 | optlen = (hdr->hdrlen + 2) << 2; | |
395 | } else { | |
396 | optlen = ipv6_optlen(hdr); | |
397 | } | |
398 | if (nexthdr == NEXTHDR_DEST) { | |
399 | __u16 i = off + 2; | |
400 | while (1) { | |
401 | struct ipv6_tlv_tnl_enc_lim *tel; | |
402 | ||
403 | /* No more room for encapsulation limit */ | |
404 | if (i + sizeof (*tel) > off + optlen) | |
405 | break; | |
406 | ||
407 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
408 | /* return index of option if found and valid */ | |
409 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
410 | tel->length == 1) | |
411 | return i; | |
412 | /* else jump to next option */ | |
413 | if (tel->type) | |
414 | i += tel->length + 2; | |
415 | else | |
416 | i++; | |
417 | } | |
418 | } | |
419 | nexthdr = hdr->nexthdr; | |
420 | off += optlen; | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
425 | /** | |
e490d1d8 | 426 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
427 | * |
428 | * Description: | |
e490d1d8 | 429 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
430 | * to the specifications in RFC 2473. |
431 | **/ | |
432 | ||
d2acc347 | 433 | static int |
502b0935 | 434 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 435 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 436 | { |
b71d1d42 | 437 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
438 | struct ip6_tnl *t; |
439 | int rel_msg = 0; | |
d5fdd6ba BH |
440 | u8 rel_type = ICMPV6_DEST_UNREACH; |
441 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
442 | __u32 rel_info = 0; |
443 | __u16 len; | |
d2acc347 | 444 | int err = -ENOENT; |
1da177e4 | 445 | |
1ab1457c YH |
446 | /* If the packet doesn't contain the original IPv6 header we are |
447 | in trouble since we might need the source address for further | |
1da177e4 LT |
448 | processing of the error. */ |
449 | ||
2922bc8a | 450 | rcu_read_lock(); |
8704ca7e | 451 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 452 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
453 | goto out; |
454 | ||
502b0935 YK |
455 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
456 | goto out; | |
457 | ||
d2acc347 HX |
458 | err = 0; |
459 | ||
e490d1d8 | 460 | switch (*type) { |
1da177e4 LT |
461 | __u32 teli; |
462 | struct ipv6_tlv_tnl_enc_lim *tel; | |
463 | __u32 mtu; | |
464 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
465 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
466 | t->parms.name); | |
1da177e4 LT |
467 | rel_msg = 1; |
468 | break; | |
469 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 470 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
471 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
472 | t->parms.name); | |
1da177e4 LT |
473 | rel_msg = 1; |
474 | } | |
475 | break; | |
476 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 477 | teli = 0; |
e490d1d8 | 478 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 479 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 480 | |
704eae1f | 481 | if (teli && teli == *info - 2) { |
1da177e4 LT |
482 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
483 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
484 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
485 | t->parms.name); | |
1da177e4 LT |
486 | rel_msg = 1; |
487 | } | |
e87cc472 JP |
488 | } else { |
489 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
490 | t->parms.name); | |
1da177e4 LT |
491 | } |
492 | break; | |
493 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 494 | mtu = *info - offset; |
1da177e4 LT |
495 | if (mtu < IPV6_MIN_MTU) |
496 | mtu = IPV6_MIN_MTU; | |
497 | t->dev->mtu = mtu; | |
498 | ||
cc6cdac0 | 499 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
500 | rel_type = ICMPV6_PKT_TOOBIG; |
501 | rel_code = 0; | |
502 | rel_info = mtu; | |
503 | rel_msg = 1; | |
504 | } | |
505 | break; | |
506 | } | |
e490d1d8 YK |
507 | |
508 | *type = rel_type; | |
509 | *code = rel_code; | |
510 | *info = rel_info; | |
511 | *msg = rel_msg; | |
512 | ||
513 | out: | |
2922bc8a | 514 | rcu_read_unlock(); |
e490d1d8 YK |
515 | return err; |
516 | } | |
517 | ||
c4d3efaf YK |
518 | static int |
519 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 520 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
521 | { |
522 | int rel_msg = 0; | |
d5fdd6ba BH |
523 | u8 rel_type = type; |
524 | u8 rel_code = code; | |
704eae1f | 525 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
526 | int err; |
527 | struct sk_buff *skb2; | |
b71d1d42 | 528 | const struct iphdr *eiph; |
c4d3efaf | 529 | struct rtable *rt; |
31e4543d | 530 | struct flowi4 fl4; |
c4d3efaf | 531 | |
502b0935 YK |
532 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
533 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
534 | if (err < 0) |
535 | return err; | |
536 | ||
537 | if (rel_msg == 0) | |
538 | return 0; | |
539 | ||
540 | switch (rel_type) { | |
541 | case ICMPV6_DEST_UNREACH: | |
542 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
543 | return 0; | |
544 | rel_type = ICMP_DEST_UNREACH; | |
545 | rel_code = ICMP_HOST_UNREACH; | |
546 | break; | |
547 | case ICMPV6_PKT_TOOBIG: | |
548 | if (rel_code != 0) | |
549 | return 0; | |
550 | rel_type = ICMP_DEST_UNREACH; | |
551 | rel_code = ICMP_FRAG_NEEDED; | |
552 | break; | |
553 | default: | |
554 | return 0; | |
555 | } | |
556 | ||
557 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
558 | return 0; | |
559 | ||
560 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
561 | if (!skb2) | |
562 | return 0; | |
563 | ||
adf30907 ED |
564 | skb_dst_drop(skb2); |
565 | ||
c4d3efaf | 566 | skb_pull(skb2, offset); |
c1d2bbe1 | 567 | skb_reset_network_header(skb2); |
eddc9ec5 | 568 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
569 | |
570 | /* Try to guess incoming interface */ | |
31e4543d | 571 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
572 | eiph->saddr, 0, |
573 | 0, 0, | |
574 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 575 | if (IS_ERR(rt)) |
c4d3efaf YK |
576 | goto out; |
577 | ||
d8d1f30b | 578 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
579 | |
580 | /* route "incoming" packet */ | |
581 | if (rt->rt_flags & RTCF_LOCAL) { | |
582 | ip_rt_put(rt); | |
583 | rt = NULL; | |
31e4543d | 584 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
585 | eiph->daddr, eiph->saddr, |
586 | 0, 0, | |
587 | IPPROTO_IPIP, | |
588 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 589 | if (IS_ERR(rt) || |
d8d1f30b | 590 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
591 | if (!IS_ERR(rt)) |
592 | ip_rt_put(rt); | |
c4d3efaf YK |
593 | goto out; |
594 | } | |
b23dd4fe | 595 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
596 | } else { |
597 | ip_rt_put(rt); | |
598 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
599 | skb2->dev) || | |
adf30907 | 600 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
601 | goto out; |
602 | } | |
603 | ||
604 | /* change mtu on this route */ | |
605 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 606 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
607 | goto out; |
608 | ||
adf30907 | 609 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); |
c4d3efaf YK |
610 | } |
611 | ||
704eae1f | 612 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
613 | |
614 | out: | |
615 | kfree_skb(skb2); | |
616 | return 0; | |
617 | } | |
618 | ||
e490d1d8 YK |
619 | static int |
620 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 621 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
622 | { |
623 | int rel_msg = 0; | |
d5fdd6ba BH |
624 | u8 rel_type = type; |
625 | u8 rel_code = code; | |
704eae1f | 626 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
627 | int err; |
628 | ||
502b0935 YK |
629 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
630 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
631 | if (err < 0) |
632 | return err; | |
633 | ||
634 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
635 | struct rt6_info *rt; |
636 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 637 | |
1da177e4 | 638 | if (!skb2) |
e490d1d8 | 639 | return 0; |
1da177e4 | 640 | |
adf30907 | 641 | skb_dst_drop(skb2); |
1da177e4 | 642 | skb_pull(skb2, offset); |
c1d2bbe1 | 643 | skb_reset_network_header(skb2); |
1da177e4 LT |
644 | |
645 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
646 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
647 | NULL, 0, 0); | |
1da177e4 | 648 | |
d1918542 DM |
649 | if (rt && rt->dst.dev) |
650 | skb2->dev = rt->dst.dev; | |
1da177e4 | 651 | |
3ffe533c | 652 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 LT |
653 | |
654 | if (rt) | |
d8d1f30b | 655 | dst_release(&rt->dst); |
1da177e4 LT |
656 | |
657 | kfree_skb(skb2); | |
658 | } | |
e490d1d8 YK |
659 | |
660 | return 0; | |
1da177e4 LT |
661 | } |
662 | ||
b71d1d42 ED |
663 | static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
664 | const struct ipv6hdr *ipv6h, | |
c4d3efaf YK |
665 | struct sk_buff *skb) |
666 | { | |
667 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
668 | ||
669 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 670 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf YK |
671 | |
672 | if (INET_ECN_is_ce(dsfield)) | |
eddc9ec5 | 673 | IP_ECN_set_ce(ip_hdr(skb)); |
c4d3efaf YK |
674 | } |
675 | ||
b71d1d42 ED |
676 | static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
677 | const struct ipv6hdr *ipv6h, | |
8359925b | 678 | struct sk_buff *skb) |
1da177e4 | 679 | { |
8359925b | 680 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 681 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 682 | |
8359925b | 683 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
0660e03f | 684 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 | 685 | } |
8359925b | 686 | |
f1a28eab | 687 | /* called with rcu_read_lock() */ |
09c6bbf0 VN |
688 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
689 | { | |
690 | struct ip6_tnl_parm *p = &t->parms; | |
691 | int ret = 0; | |
2f7f54b7 | 692 | struct net *net = dev_net(t->dev); |
09c6bbf0 VN |
693 | |
694 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 695 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
696 | |
697 | if (p->link) | |
f1a28eab | 698 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 VN |
699 | |
700 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
2f7f54b7 PE |
701 | likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && |
702 | likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) | |
09c6bbf0 VN |
703 | ret = 1; |
704 | ||
09c6bbf0 VN |
705 | } |
706 | return ret; | |
707 | } | |
1da177e4 LT |
708 | |
709 | /** | |
3144581c | 710 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 711 | * @skb: received socket buffer |
8359925b YK |
712 | * @protocol: ethernet protocol ID |
713 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
714 | * |
715 | * Return: 0 | |
716 | **/ | |
717 | ||
8359925b | 718 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 719 | __u8 ipproto, |
b71d1d42 ED |
720 | void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
721 | const struct ipv6hdr *ipv6h, | |
8359925b | 722 | struct sk_buff *skb)) |
1da177e4 | 723 | { |
1da177e4 | 724 | struct ip6_tnl *t; |
b71d1d42 | 725 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
1da177e4 | 726 | |
2922bc8a | 727 | rcu_read_lock(); |
1da177e4 | 728 | |
8704ca7e | 729 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 730 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
731 | struct pcpu_tstats *tstats; |
732 | ||
502b0935 | 733 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 734 | rcu_read_unlock(); |
502b0935 YK |
735 | goto discard; |
736 | } | |
737 | ||
1da177e4 | 738 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 739 | rcu_read_unlock(); |
50fba2aa | 740 | goto discard; |
1da177e4 LT |
741 | } |
742 | ||
09c6bbf0 | 743 | if (!ip6_tnl_rcv_ctl(t)) { |
3dca02af | 744 | t->dev->stats.rx_dropped++; |
2922bc8a | 745 | rcu_read_unlock(); |
1da177e4 LT |
746 | goto discard; |
747 | } | |
748 | secpath_reset(skb); | |
b0e380b1 | 749 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 750 | skb_reset_network_header(skb); |
8359925b | 751 | skb->protocol = htons(protocol); |
1da177e4 LT |
752 | skb->pkt_type = PACKET_HOST; |
753 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 754 | |
8560f226 ED |
755 | tstats = this_cpu_ptr(t->dev->tstats); |
756 | tstats->rx_packets++; | |
757 | tstats->rx_bytes += skb->len; | |
758 | ||
759 | __skb_tunnel_rx(skb, t->dev); | |
8359925b | 760 | |
d19d56dd | 761 | dscp_ecn_decapsulate(t, ipv6h, skb); |
8990f468 | 762 | |
caf586e5 | 763 | netif_rx(skb); |
8990f468 | 764 | |
2922bc8a | 765 | rcu_read_unlock(); |
1da177e4 LT |
766 | return 0; |
767 | } | |
2922bc8a | 768 | rcu_read_unlock(); |
1da177e4 | 769 | return 1; |
50fba2aa HX |
770 | |
771 | discard: | |
772 | kfree_skb(skb); | |
773 | return 0; | |
1da177e4 LT |
774 | } |
775 | ||
c4d3efaf YK |
776 | static int ip4ip6_rcv(struct sk_buff *skb) |
777 | { | |
502b0935 YK |
778 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
779 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
780 | } |
781 | ||
8359925b YK |
782 | static int ip6ip6_rcv(struct sk_buff *skb) |
783 | { | |
502b0935 YK |
784 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
785 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
786 | } |
787 | ||
6fb32dde VN |
788 | struct ipv6_tel_txoption { |
789 | struct ipv6_txoptions ops; | |
790 | __u8 dst_opt[8]; | |
791 | }; | |
1da177e4 | 792 | |
6fb32dde VN |
793 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
794 | { | |
795 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 796 | |
6fb32dde VN |
797 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
798 | opt->dst_opt[3] = 1; | |
799 | opt->dst_opt[4] = encap_limit; | |
800 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
801 | opt->dst_opt[6] = 1; | |
1da177e4 | 802 | |
6fb32dde VN |
803 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
804 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
805 | } |
806 | ||
807 | /** | |
3144581c | 808 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 809 | * @t: the outgoing tunnel device |
1ab1457c | 810 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
811 | * |
812 | * Description: | |
1ab1457c | 813 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
814 | * doesn't match source of incoming packet. |
815 | * | |
1ab1457c | 816 | * Return: |
1da177e4 LT |
817 | * 1 if conflict, |
818 | * 0 else | |
819 | **/ | |
820 | ||
821 | static inline int | |
b71d1d42 | 822 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
823 | { |
824 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
825 | } | |
826 | ||
09c6bbf0 VN |
827 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
828 | { | |
829 | struct ip6_tnl_parm *p = &t->parms; | |
830 | int ret = 0; | |
2f7f54b7 | 831 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 832 | |
1ab1457c | 833 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
834 | struct net_device *ldev = NULL; |
835 | ||
f1a28eab | 836 | rcu_read_lock(); |
09c6bbf0 | 837 | if (p->link) |
f1a28eab | 838 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 839 | |
2f7f54b7 | 840 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
841 | pr_warn("%s xmit: Local address not yet configured!\n", |
842 | p->name); | |
09c6bbf0 | 843 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 844 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
845 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
846 | p->name); | |
09c6bbf0 VN |
847 | else |
848 | ret = 1; | |
f1a28eab | 849 | rcu_read_unlock(); |
09c6bbf0 VN |
850 | } |
851 | return ret; | |
852 | } | |
1da177e4 | 853 | /** |
61ec2aec | 854 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 855 | * @skb: the outgoing socket buffer |
1ab1457c | 856 | * @dev: the outgoing tunnel device |
61ec2aec YK |
857 | * @dsfield: dscp code for outer header |
858 | * @fl: flow of tunneled packet | |
859 | * @encap_limit: encapsulation limit | |
860 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
861 | * |
862 | * Description: | |
863 | * Build new header and do some sanity checks on the packet before sending | |
864 | * it. | |
865 | * | |
1ab1457c | 866 | * Return: |
c4d3efaf | 867 | * 0 on success |
61ec2aec YK |
868 | * -1 fail |
869 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
870 | **/ |
871 | ||
61ec2aec YK |
872 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
873 | struct net_device *dev, | |
874 | __u8 dsfield, | |
4c9483b2 | 875 | struct flowi6 *fl6, |
61ec2aec YK |
876 | int encap_limit, |
877 | __u32 *pmtu) | |
1da177e4 | 878 | { |
52479b62 | 879 | struct net *net = dev_net(dev); |
2941a486 | 880 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 881 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 882 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 883 | struct ipv6_tel_txoption opt; |
d24f22f3 | 884 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
885 | struct net_device *tdev; |
886 | int mtu; | |
c2636b4d | 887 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 888 | u8 proto; |
61ec2aec | 889 | int err = -1; |
1da177e4 | 890 | int pkt_len; |
1da177e4 | 891 | |
d24f22f3 ED |
892 | if (!fl6->flowi6_mark) |
893 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
894 | if (!dst) { |
895 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 896 | |
89b02126 | 897 | if (ndst->error) |
a57ebc90 | 898 | goto tx_err_link_failure; |
89b02126 ED |
899 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
900 | if (IS_ERR(ndst)) { | |
901 | err = PTR_ERR(ndst); | |
902 | ndst = NULL; | |
452edd59 DM |
903 | goto tx_err_link_failure; |
904 | } | |
89b02126 | 905 | dst = ndst; |
a57ebc90 | 906 | } |
1da177e4 LT |
907 | |
908 | tdev = dst->dev; | |
909 | ||
910 | if (tdev == dev) { | |
911 | stats->collisions++; | |
e87cc472 JP |
912 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
913 | t->parms.name); | |
1da177e4 LT |
914 | goto tx_err_dst_release; |
915 | } | |
916 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 917 | if (encap_limit >= 0) { |
1da177e4 LT |
918 | max_headroom += 8; |
919 | mtu -= 8; | |
920 | } | |
921 | if (mtu < IPV6_MIN_MTU) | |
922 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
923 | if (skb_dst(skb)) |
924 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 925 | if (skb->len > mtu) { |
61ec2aec YK |
926 | *pmtu = mtu; |
927 | err = -EMSGSIZE; | |
1da177e4 LT |
928 | goto tx_err_dst_release; |
929 | } | |
930 | ||
931 | /* | |
932 | * Okay, now see if we can stuff it in the buffer as-is. | |
933 | */ | |
934 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 935 | |
cfbba49d PM |
936 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
937 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 938 | struct sk_buff *new_skb; |
1ab1457c | 939 | |
1da177e4 LT |
940 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
941 | goto tx_err_dst_release; | |
942 | ||
943 | if (skb->sk) | |
944 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 945 | consume_skb(skb); |
1da177e4 LT |
946 | skb = new_skb; |
947 | } | |
adf30907 | 948 | skb_dst_drop(skb); |
d24f22f3 ED |
949 | if (fl6->flowi6_mark) { |
950 | skb_dst_set(skb, dst); | |
951 | ndst = NULL; | |
952 | } else { | |
953 | skb_dst_set_noref(skb, dst); | |
954 | } | |
b0e380b1 | 955 | skb->transport_header = skb->network_header; |
1da177e4 | 956 | |
4c9483b2 | 957 | proto = fl6->flowi6_proto; |
6fb32dde VN |
958 | if (encap_limit >= 0) { |
959 | init_tel_txopt(&opt, encap_limit); | |
960 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
961 | } | |
e2d1bca7 ACM |
962 | skb_push(skb, sizeof(struct ipv6hdr)); |
963 | skb_reset_network_header(skb); | |
0660e03f | 964 | ipv6h = ipv6_hdr(skb); |
4c9483b2 | 965 | *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000); |
1da177e4 LT |
966 | dsfield = INET_ECN_encapsulate(0, dsfield); |
967 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
1da177e4 LT |
968 | ipv6h->hop_limit = t->parms.hop_limit; |
969 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
970 | ipv6h->saddr = fl6->saddr; |
971 | ipv6h->daddr = fl6->daddr; | |
1da177e4 LT |
972 | nf_reset(skb); |
973 | pkt_len = skb->len; | |
ef76bc23 | 974 | err = ip6_local_out(skb); |
1da177e4 | 975 | |
b9df3cb8 | 976 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
977 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
978 | ||
979 | tstats->tx_bytes += pkt_len; | |
980 | tstats->tx_packets++; | |
1da177e4 LT |
981 | } else { |
982 | stats->tx_errors++; | |
983 | stats->tx_aborted_errors++; | |
984 | } | |
89b02126 ED |
985 | if (ndst) |
986 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
987 | return 0; |
988 | tx_err_link_failure: | |
989 | stats->tx_carrier_errors++; | |
990 | dst_link_failure(skb); | |
991 | tx_err_dst_release: | |
89b02126 | 992 | dst_release(ndst); |
61ec2aec YK |
993 | return err; |
994 | } | |
995 | ||
c4d3efaf YK |
996 | static inline int |
997 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
998 | { | |
999 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1000 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1001 | int encap_limit = -1; |
4c9483b2 | 1002 | struct flowi6 fl6; |
c4d3efaf YK |
1003 | __u8 dsfield; |
1004 | __u32 mtu; | |
1005 | int err; | |
1006 | ||
502b0935 YK |
1007 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1008 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1009 | return -1; |
1010 | ||
1011 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1012 | encap_limit = t->parms.encap_limit; | |
1013 | ||
4c9483b2 DM |
1014 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1015 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1016 | |
1017 | dsfield = ipv4_get_dsfield(iph); | |
1018 | ||
d24f22f3 | 1019 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1020 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1021 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1022 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1023 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1024 | |
4c9483b2 | 1025 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1026 | if (err != 0) { |
1027 | /* XXX: send ICMP error even if DF is not set. */ | |
1028 | if (err == -EMSGSIZE) | |
1029 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1030 | htonl(mtu)); | |
1031 | return -1; | |
1032 | } | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
61ec2aec YK |
1037 | static inline int |
1038 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1039 | { | |
1040 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1041 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1042 | int encap_limit = -1; |
1043 | __u16 offset; | |
4c9483b2 | 1044 | struct flowi6 fl6; |
61ec2aec YK |
1045 | __u8 dsfield; |
1046 | __u32 mtu; | |
1047 | int err; | |
1048 | ||
502b0935 YK |
1049 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1050 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1051 | return -1; |
1052 | ||
d56f90a7 ACM |
1053 | offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); |
1054 | if (offset > 0) { | |
61ec2aec | 1055 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1056 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1057 | if (tel->encap_limit == 0) { |
1058 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1059 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1060 | return -1; |
1061 | } | |
1062 | encap_limit = tel->encap_limit - 1; | |
1063 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1064 | encap_limit = t->parms.encap_limit; | |
1065 | ||
4c9483b2 DM |
1066 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1067 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1068 | |
1069 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1070 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1071 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1072 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1073 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1074 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1075 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1076 | |
4c9483b2 | 1077 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1078 | if (err != 0) { |
1079 | if (err == -EMSGSIZE) | |
3ffe533c | 1080 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1081 | return -1; |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
6fef4c0c | 1087 | static netdev_tx_t |
61ec2aec YK |
1088 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1089 | { | |
1090 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1091 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1092 | int ret; |
1093 | ||
61ec2aec | 1094 | switch (skb->protocol) { |
60678040 | 1095 | case htons(ETH_P_IP): |
c4d3efaf YK |
1096 | ret = ip4ip6_tnl_xmit(skb, dev); |
1097 | break; | |
60678040 | 1098 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1099 | ret = ip6ip6_tnl_xmit(skb, dev); |
1100 | break; | |
1101 | default: | |
1102 | goto tx_err; | |
1103 | } | |
1104 | ||
1105 | if (ret < 0) | |
1106 | goto tx_err; | |
1107 | ||
6ed10654 | 1108 | return NETDEV_TX_OK; |
61ec2aec | 1109 | |
1da177e4 LT |
1110 | tx_err: |
1111 | stats->tx_errors++; | |
1112 | stats->tx_dropped++; | |
1113 | kfree_skb(skb); | |
6ed10654 | 1114 | return NETDEV_TX_OK; |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
1118 | { | |
1119 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
1120 | int ltype = ipv6_addr_type(&p->laddr); |
1121 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
1122 | |
1123 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
1124 | ||
09c6bbf0 VN |
1125 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
1126 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
1127 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 1128 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
1129 | if (ltype&IPV6_ADDR_UNICAST) |
1130 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
1131 | if (rtype&IPV6_ADDR_UNICAST) | |
1132 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
1133 | } |
1134 | } | |
1135 | ||
3144581c | 1136 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1137 | { |
1138 | struct net_device *dev = t->dev; | |
1139 | struct ip6_tnl_parm *p = &t->parms; | |
4c9483b2 | 1140 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1141 | |
3a6d54c5 JP |
1142 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1143 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1144 | |
1145 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1146 | fl6->saddr = p->laddr; |
1147 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1148 | fl6->flowi6_oif = p->link; |
1149 | fl6->flowlabel = 0; | |
1da177e4 LT |
1150 | |
1151 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1152 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1153 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1154 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 LT |
1155 | |
1156 | ip6_tnl_set_cap(t); | |
1157 | ||
1158 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1159 | dev->flags |= IFF_POINTOPOINT; | |
1160 | else | |
1161 | dev->flags &= ~IFF_POINTOPOINT; | |
1162 | ||
1163 | dev->iflink = p->link; | |
1164 | ||
1165 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1166 | int strict = (ipv6_addr_type(&p->raddr) & |
1167 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1168 | ||
2f7f54b7 PE |
1169 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1170 | &p->raddr, &p->laddr, | |
305d4b3c | 1171 | p->link, strict); |
1da177e4 LT |
1172 | |
1173 | if (rt == NULL) | |
1174 | return; | |
1175 | ||
d1918542 DM |
1176 | if (rt->dst.dev) { |
1177 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1178 | sizeof (struct ipv6hdr); |
1179 | ||
d1918542 | 1180 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1181 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1182 | dev->mtu-=8; | |
1da177e4 LT |
1183 | |
1184 | if (dev->mtu < IPV6_MIN_MTU) | |
1185 | dev->mtu = IPV6_MIN_MTU; | |
1186 | } | |
d8d1f30b | 1187 | dst_release(&rt->dst); |
1da177e4 LT |
1188 | } |
1189 | } | |
1190 | ||
1191 | /** | |
3144581c | 1192 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1193 | * @t: tunnel to be changed |
1194 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1195 | * |
1196 | * Description: | |
3144581c | 1197 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1198 | **/ |
1199 | ||
1200 | static int | |
3144581c | 1201 | ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) |
1da177e4 | 1202 | { |
4e3fd7a0 AD |
1203 | t->parms.laddr = p->laddr; |
1204 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1205 | t->parms.flags = p->flags; |
1206 | t->parms.hop_limit = p->hop_limit; | |
1207 | t->parms.encap_limit = p->encap_limit; | |
1208 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1209 | t->parms.link = p->link; |
502b0935 | 1210 | t->parms.proto = p->proto; |
0c088890 | 1211 | ip6_tnl_dst_reset(t); |
3144581c | 1212 | ip6_tnl_link_config(t); |
1da177e4 LT |
1213 | return 0; |
1214 | } | |
1215 | ||
1216 | /** | |
3144581c | 1217 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1218 | * @dev: virtual device associated with tunnel |
1219 | * @ifr: parameters passed from userspace | |
1220 | * @cmd: command to be performed | |
1221 | * | |
1222 | * Description: | |
3144581c | 1223 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1224 | * from userspace. |
1da177e4 LT |
1225 | * |
1226 | * The possible commands are the following: | |
1227 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1228 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1229 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1230 | * %SIOCDELTUNNEL: delete tunnel | |
1231 | * | |
1ab1457c | 1232 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1233 | * initialization, can be used for creating other tunnel devices. |
1234 | * | |
1235 | * Return: | |
1236 | * 0 on success, | |
1237 | * %-EFAULT if unable to copy data to or from userspace, | |
1238 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1239 | * %-EINVAL if passed tunnel parameters are invalid, | |
1240 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1241 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1242 | **/ | |
1243 | ||
1244 | static int | |
3144581c | 1245 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1246 | { |
1247 | int err = 0; | |
1da177e4 LT |
1248 | struct ip6_tnl_parm p; |
1249 | struct ip6_tnl *t = NULL; | |
2dd02c89 PE |
1250 | struct net *net = dev_net(dev); |
1251 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1252 | |
1253 | switch (cmd) { | |
1254 | case SIOCGETTUNNEL: | |
15820e12 | 1255 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1256 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1257 | err = -EFAULT; |
1258 | break; | |
1259 | } | |
2dd02c89 | 1260 | t = ip6_tnl_locate(net, &p, 0); |
567131a7 VN |
1261 | } |
1262 | if (t == NULL) | |
2941a486 | 1263 | t = netdev_priv(dev); |
1da177e4 LT |
1264 | memcpy(&p, &t->parms, sizeof (p)); |
1265 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1266 | err = -EFAULT; | |
1267 | } | |
1268 | break; | |
1269 | case SIOCADDTUNNEL: | |
1270 | case SIOCCHGTUNNEL: | |
1271 | err = -EPERM; | |
1da177e4 LT |
1272 | if (!capable(CAP_NET_ADMIN)) |
1273 | break; | |
567131a7 VN |
1274 | err = -EFAULT; |
1275 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1276 | break; |
567131a7 | 1277 | err = -EINVAL; |
502b0935 YK |
1278 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1279 | p.proto != 0) | |
1da177e4 | 1280 | break; |
2dd02c89 | 1281 | t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); |
15820e12 | 1282 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1283 | if (t != NULL) { |
1284 | if (t->dev != dev) { | |
1285 | err = -EEXIST; | |
1286 | break; | |
1287 | } | |
1288 | } else | |
1289 | t = netdev_priv(dev); | |
1290 | ||
2dd02c89 | 1291 | ip6_tnl_unlink(ip6n, t); |
74b0b85b | 1292 | synchronize_net(); |
3144581c | 1293 | err = ip6_tnl_change(t, &p); |
2dd02c89 | 1294 | ip6_tnl_link(ip6n, t); |
1da177e4 LT |
1295 | netdev_state_change(dev); |
1296 | } | |
567131a7 | 1297 | if (t) { |
1da177e4 | 1298 | err = 0; |
567131a7 VN |
1299 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1300 | err = -EFAULT; | |
1301 | ||
1302 | } else | |
1303 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1304 | break; |
1305 | case SIOCDELTUNNEL: | |
1306 | err = -EPERM; | |
1307 | if (!capable(CAP_NET_ADMIN)) | |
1308 | break; | |
1309 | ||
15820e12 | 1310 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1311 | err = -EFAULT; |
1312 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1313 | break; |
567131a7 | 1314 | err = -ENOENT; |
2dd02c89 | 1315 | if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) |
1da177e4 | 1316 | break; |
567131a7 | 1317 | err = -EPERM; |
15820e12 | 1318 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1319 | break; |
567131a7 | 1320 | dev = t->dev; |
1da177e4 | 1321 | } |
22f8cde5 SH |
1322 | err = 0; |
1323 | unregister_netdevice(dev); | |
1da177e4 LT |
1324 | break; |
1325 | default: | |
1326 | err = -EINVAL; | |
1327 | } | |
1328 | return err; | |
1329 | } | |
1330 | ||
1da177e4 | 1331 | /** |
3144581c | 1332 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1333 | * @dev: virtual device associated with tunnel |
1334 | * @new_mtu: the new mtu | |
1335 | * | |
1336 | * Return: | |
1337 | * 0 on success, | |
1338 | * %-EINVAL if mtu too small | |
1339 | **/ | |
1340 | ||
1341 | static int | |
3144581c | 1342 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1343 | { |
1344 | if (new_mtu < IPV6_MIN_MTU) { | |
1345 | return -EINVAL; | |
1346 | } | |
1347 | dev->mtu = new_mtu; | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1326c3d5 SH |
1351 | |
1352 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1353 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1354 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1355 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1356 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1357 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1358 | }; |
1359 | ||
8560f226 | 1360 | |
1da177e4 | 1361 | /** |
3144581c | 1362 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1363 | * @dev: virtual device associated with tunnel |
1364 | * | |
1365 | * Description: | |
1366 | * Initialize function pointers and device parameters | |
1367 | **/ | |
1368 | ||
3144581c | 1369 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1370 | { |
381601e5 AF |
1371 | struct ip6_tnl *t; |
1372 | ||
1326c3d5 | 1373 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1374 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1375 | |
1376 | dev->type = ARPHRD_TUNNEL6; | |
1377 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1378 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1379 | t = netdev_priv(dev); |
1380 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1381 | dev->mtu-=8; | |
1da177e4 LT |
1382 | dev->flags |= IFF_NOARP; |
1383 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1384 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1385 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1386 | } |
1387 | ||
1388 | ||
1389 | /** | |
3144581c | 1390 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1391 | * @dev: virtual device associated with tunnel |
1392 | **/ | |
1393 | ||
8560f226 | 1394 | static inline int |
3144581c | 1395 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1396 | { |
2941a486 | 1397 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1398 | |
1da177e4 | 1399 | t->dev = dev; |
8560f226 ED |
1400 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1401 | if (!dev->tstats) | |
1402 | return -ENOMEM; | |
1403 | return 0; | |
1da177e4 LT |
1404 | } |
1405 | ||
1406 | /** | |
3144581c | 1407 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1408 | * @dev: virtual device associated with tunnel |
1409 | **/ | |
1410 | ||
8560f226 | 1411 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1412 | { |
2941a486 | 1413 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1414 | int err = ip6_tnl_dev_init_gen(dev); |
1415 | ||
1416 | if (err) | |
1417 | return err; | |
3144581c | 1418 | ip6_tnl_link_config(t); |
8560f226 | 1419 | return 0; |
1da177e4 LT |
1420 | } |
1421 | ||
1422 | /** | |
3144581c | 1423 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1424 | * @dev: fallback device |
1425 | * | |
1426 | * Return: 0 | |
1427 | **/ | |
1428 | ||
8560f226 | 1429 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1430 | { |
2941a486 | 1431 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1432 | struct net *net = dev_net(dev); |
1433 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1434 | int err = ip6_tnl_dev_init_gen(dev); |
1435 | ||
1436 | if (err) | |
1437 | return err; | |
3e6c9fb5 | 1438 | |
502b0935 | 1439 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1440 | dev_hold(dev); |
cf778b00 | 1441 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1442 | return 0; |
1da177e4 LT |
1443 | } |
1444 | ||
3ff2cfa5 | 1445 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1446 | .handler = ip4ip6_rcv, |
1447 | .err_handler = ip4ip6_err, | |
1448 | .priority = 1, | |
1449 | }; | |
1450 | ||
3ff2cfa5 | 1451 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1452 | .handler = ip6ip6_rcv, |
1453 | .err_handler = ip6ip6_err, | |
d2acc347 | 1454 | .priority = 1, |
1da177e4 LT |
1455 | }; |
1456 | ||
2c8c1e72 | 1457 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1458 | { |
1459 | int h; | |
1460 | struct ip6_tnl *t; | |
cf4432f5 | 1461 | LIST_HEAD(list); |
3e6c9fb5 PE |
1462 | |
1463 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1464 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1465 | while (t != NULL) { |
1466 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1467 | t = rtnl_dereference(t->next); |
cf4432f5 | 1468 | } |
3e6c9fb5 PE |
1469 | } |
1470 | ||
94767632 | 1471 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1472 | unregister_netdevice_queue(t->dev, &list); |
1473 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1474 | } |
1475 | ||
2c8c1e72 | 1476 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1477 | { |
ac31cd3c | 1478 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1479 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1480 | int err; |
13eeb8e9 | 1481 | |
3e6c9fb5 PE |
1482 | ip6n->tnls[0] = ip6n->tnls_wc; |
1483 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1484 | ||
15820e12 PE |
1485 | err = -ENOMEM; |
1486 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1487 | ip6_tnl_dev_setup); | |
1488 | ||
1489 | if (!ip6n->fb_tnl_dev) | |
1490 | goto err_alloc_dev; | |
be77e593 | 1491 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1492 | |
8560f226 ED |
1493 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1494 | if (err < 0) | |
1495 | goto err_register; | |
15820e12 PE |
1496 | |
1497 | err = register_netdev(ip6n->fb_tnl_dev); | |
1498 | if (err < 0) | |
1499 | goto err_register; | |
731abb9c JB |
1500 | |
1501 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1502 | ||
1503 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1504 | return 0; |
1505 | ||
15820e12 | 1506 | err_register: |
8560f226 | 1507 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1508 | err_alloc_dev: |
13eeb8e9 PE |
1509 | return err; |
1510 | } | |
1511 | ||
2c8c1e72 | 1512 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1513 | { |
ac31cd3c | 1514 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1515 | |
3e6c9fb5 PE |
1516 | rtnl_lock(); |
1517 | ip6_tnl_destroy_tunnels(ip6n); | |
1518 | rtnl_unlock(); | |
13eeb8e9 PE |
1519 | } |
1520 | ||
1521 | static struct pernet_operations ip6_tnl_net_ops = { | |
1522 | .init = ip6_tnl_init_net, | |
1523 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1524 | .id = &ip6_tnl_net_id, |
1525 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1526 | }; |
1527 | ||
1da177e4 LT |
1528 | /** |
1529 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1530 | * | |
1531 | * Return: 0 on success | |
1532 | **/ | |
1533 | ||
1534 | static int __init ip6_tunnel_init(void) | |
1535 | { | |
1536 | int err; | |
1537 | ||
d5aa407f AD |
1538 | err = register_pernet_device(&ip6_tnl_net_ops); |
1539 | if (err < 0) | |
1540 | goto out_pernet; | |
1541 | ||
1542 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1543 | if (err < 0) { | |
f3213831 | 1544 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1545 | goto out_ip4ip6; |
c4d3efaf YK |
1546 | } |
1547 | ||
d5aa407f AD |
1548 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1549 | if (err < 0) { | |
f3213831 | 1550 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1551 | goto out_ip6ip6; |
1da177e4 | 1552 | } |
13eeb8e9 | 1553 | |
1da177e4 | 1554 | return 0; |
d5aa407f AD |
1555 | |
1556 | out_ip6ip6: | |
c4d3efaf | 1557 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1558 | out_ip4ip6: |
1559 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1560 | out_pernet: | |
1da177e4 LT |
1561 | return err; |
1562 | } | |
1563 | ||
1564 | /** | |
1565 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1566 | **/ | |
1567 | ||
1568 | static void __exit ip6_tunnel_cleanup(void) | |
1569 | { | |
c4d3efaf | 1570 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1571 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1572 | |
73d605d1 | 1573 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1574 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1575 | |
ac31cd3c | 1576 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | module_init(ip6_tunnel_init); | |
1580 | module_exit(ip6_tunnel_cleanup); |