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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/module.h> |
4fc268d2 | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/errno.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
1da177e4 LT |
26 | #include <linux/net.h> |
27 | #include <linux/in6.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/icmp.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 LT |
32 | #include <asm/uaccess.h> |
33 | #include <linux/init.h> | |
34 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 35 | #include <linux/if_ether.h> |
1da177e4 LT |
36 | |
37 | #include <net/sock.h> | |
38 | #include <net/snmp.h> | |
39 | ||
40 | #include <net/ipv6.h> | |
41 | #include <net/protocol.h> | |
42 | #include <net/transp_v6.h> | |
43 | #include <net/ip6_fib.h> | |
44 | #include <net/ip6_route.h> | |
45 | #include <net/ndisc.h> | |
46 | #include <net/addrconf.h> | |
47 | #include <net/ip.h> | |
48 | #include <net/udp.h> | |
49 | #include <net/icmp.h> | |
50 | #include <net/ipip.h> | |
51 | #include <net/inet_ecn.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/dsfield.h> | |
8190d900 PE |
54 | #include <net/net_namespace.h> |
55 | #include <net/netns/generic.h> | |
1da177e4 LT |
56 | |
57 | /* | |
58 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
59 | ||
60 | For comments look at net/ipv4/ip_gre.c --ANK | |
61 | */ | |
62 | ||
63 | #define HASH_SIZE 16 | |
e69a4adc | 64 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 65 | |
15fc1f70 | 66 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 67 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 68 | static void ipip6_dev_free(struct net_device *dev); |
1da177e4 | 69 | |
f99189b1 | 70 | static int sit_net_id __read_mostly; |
8190d900 | 71 | struct sit_net { |
3a43be3c ED |
72 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
73 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
74 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
75 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
76 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 77 | |
cd3dbc19 | 78 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
79 | }; |
80 | ||
4543c10d | 81 | /* |
3a43be3c | 82 | * Locking : hash tables are protected by RCU and RTNL |
4543c10d | 83 | */ |
4543c10d ED |
84 | |
85 | #define for_each_ip_tunnel_rcu(start) \ | |
86 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 87 | |
15fc1f70 ED |
88 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
89 | struct pcpu_tstats { | |
90 | unsigned long rx_packets; | |
91 | unsigned long rx_bytes; | |
92 | unsigned long tx_packets; | |
93 | unsigned long tx_bytes; | |
94 | }; | |
95 | ||
96 | static struct net_device_stats *ipip6_get_stats(struct net_device *dev) | |
97 | { | |
98 | struct pcpu_tstats sum = { 0 }; | |
99 | int i; | |
100 | ||
101 | for_each_possible_cpu(i) { | |
102 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
103 | ||
104 | sum.rx_packets += tstats->rx_packets; | |
105 | sum.rx_bytes += tstats->rx_bytes; | |
106 | sum.tx_packets += tstats->tx_packets; | |
107 | sum.tx_bytes += tstats->tx_bytes; | |
108 | } | |
109 | dev->stats.rx_packets = sum.rx_packets; | |
110 | dev->stats.rx_bytes = sum.rx_bytes; | |
111 | dev->stats.tx_packets = sum.tx_packets; | |
112 | dev->stats.tx_bytes = sum.tx_bytes; | |
113 | return &dev->stats; | |
114 | } | |
4543c10d ED |
115 | /* |
116 | * Must be invoked with rcu_read_lock | |
117 | */ | |
ca8def14 | 118 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 119 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 120 | { |
3a43be3c ED |
121 | unsigned int h0 = HASH(remote); |
122 | unsigned int h1 = HASH(local); | |
1da177e4 | 123 | struct ip_tunnel *t; |
29182176 | 124 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 125 | |
4543c10d | 126 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 127 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
128 | remote == t->parms.iph.daddr && |
129 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
130 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
131 | return t; |
132 | } | |
4543c10d | 133 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { |
4fddbf5d SH |
134 | if (remote == t->parms.iph.daddr && |
135 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
136 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
137 | return t; |
138 | } | |
4543c10d | 139 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { |
4fddbf5d SH |
140 | if (local == t->parms.iph.saddr && |
141 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
142 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
143 | return t; |
144 | } | |
4543c10d | 145 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 146 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
147 | return t; |
148 | return NULL; | |
149 | } | |
150 | ||
3a43be3c | 151 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 152 | struct ip_tunnel_parm *parms) |
1da177e4 | 153 | { |
420fe234 YH |
154 | __be32 remote = parms->iph.daddr; |
155 | __be32 local = parms->iph.saddr; | |
3a43be3c | 156 | unsigned int h = 0; |
1da177e4 LT |
157 | int prio = 0; |
158 | ||
159 | if (remote) { | |
160 | prio |= 2; | |
161 | h ^= HASH(remote); | |
162 | } | |
163 | if (local) { | |
164 | prio |= 1; | |
165 | h ^= HASH(local); | |
166 | } | |
29182176 | 167 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
168 | } |
169 | ||
3a43be3c | 170 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 171 | struct ip_tunnel *t) |
420fe234 | 172 | { |
ca8def14 | 173 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
174 | } |
175 | ||
ca8def14 | 176 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 177 | { |
3a43be3c ED |
178 | struct ip_tunnel __rcu **tp; |
179 | struct ip_tunnel *iter; | |
180 | ||
181 | for (tp = ipip6_bucket(sitn, t); | |
182 | (iter = rtnl_dereference(*tp)) != NULL; | |
183 | tp = &iter->next) { | |
184 | if (t == iter) { | |
185 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
186 | break; |
187 | } | |
188 | } | |
189 | } | |
190 | ||
ca8def14 | 191 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 192 | { |
3a43be3c | 193 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 194 | |
3a43be3c | 195 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
4543c10d | 196 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
197 | } |
198 | ||
e0c93948 | 199 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
200 | { |
201 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
202 | struct ip_tunnel *t = netdev_priv(dev); |
203 | ||
fa857afc YH |
204 | if (t->dev == sitn->fb_tunnel_dev) { |
205 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
206 | t->ip6rd.relay_prefix = 0; | |
207 | t->ip6rd.prefixlen = 16; | |
208 | t->ip6rd.relay_prefixlen = 0; | |
209 | } else { | |
210 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
211 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
212 | } | |
213 | #endif | |
214 | } | |
215 | ||
3a43be3c | 216 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 217 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 218 | { |
e69a4adc AV |
219 | __be32 remote = parms->iph.daddr; |
220 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
221 | struct ip_tunnel *t, *nt; |
222 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 223 | struct net_device *dev; |
1da177e4 | 224 | char name[IFNAMSIZ]; |
ca8def14 | 225 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 226 | |
3a43be3c ED |
227 | for (tp = __ipip6_bucket(sitn, parms); |
228 | (t = rtnl_dereference(*tp)) != NULL; | |
229 | tp = &t->next) { | |
8db99e57 | 230 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
231 | remote == t->parms.iph.daddr && |
232 | parms->link == t->parms.link) { | |
8db99e57 SH |
233 | if (create) |
234 | return NULL; | |
235 | else | |
236 | return t; | |
237 | } | |
1da177e4 LT |
238 | } |
239 | if (!create) | |
240 | goto failed; | |
241 | ||
242 | if (parms->name[0]) | |
243 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 244 | else |
15fc1f70 | 245 | strcpy(name, "sit%d"); |
1da177e4 LT |
246 | |
247 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
248 | if (dev == NULL) | |
249 | return NULL; | |
250 | ||
7a97146c PE |
251 | dev_net_set(dev, net); |
252 | ||
b37d428b PE |
253 | if (strchr(name, '%')) { |
254 | if (dev_alloc_name(dev, name) < 0) | |
255 | goto failed_free; | |
256 | } | |
257 | ||
2941a486 | 258 | nt = netdev_priv(dev); |
1326c3d5 | 259 | |
1da177e4 | 260 | nt->parms = *parms; |
15fc1f70 ED |
261 | if (ipip6_tunnel_init(dev) < 0) |
262 | goto failed_free; | |
e0c93948 | 263 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 264 | |
c7dc89c0 FT |
265 | if (parms->i_flags & SIT_ISATAP) |
266 | dev->priv_flags |= IFF_ISATAP; | |
267 | ||
b37d428b PE |
268 | if (register_netdevice(dev) < 0) |
269 | goto failed_free; | |
1da177e4 LT |
270 | |
271 | dev_hold(dev); | |
272 | ||
ca8def14 | 273 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
274 | return nt; |
275 | ||
b37d428b | 276 | failed_free: |
15fc1f70 | 277 | ipip6_dev_free(dev); |
1da177e4 LT |
278 | failed: |
279 | return NULL; | |
280 | } | |
281 | ||
ef9a9d11 ED |
282 | #define for_each_prl_rcu(start) \ |
283 | for (prl = rcu_dereference(start); \ | |
284 | prl; \ | |
285 | prl = rcu_dereference(prl->next)) | |
286 | ||
fadf6bf0 | 287 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 288 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 289 | { |
ef9a9d11 | 290 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 291 | |
ef9a9d11 ED |
292 | for_each_prl_rcu(t->prl) |
293 | if (prl->addr == addr) | |
fadf6bf0 | 294 | break; |
ef9a9d11 | 295 | return prl; |
fadf6bf0 TF |
296 | |
297 | } | |
298 | ||
2b4743bd YH |
299 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
300 | struct ip_tunnel_prl __user *a) | |
300aaeea | 301 | { |
2b4743bd | 302 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
303 | struct ip_tunnel_prl_entry *prl; |
304 | unsigned int cmax, c = 0, ca, len; | |
305 | int ret = 0; | |
306 | ||
2b4743bd YH |
307 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
308 | return -EFAULT; | |
309 | cmax = kprl.datalen / sizeof(kprl); | |
310 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
311 | cmax = 1; |
312 | ||
313 | /* For simple GET or for root users, | |
314 | * we try harder to allocate. | |
315 | */ | |
316 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
317 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
318 | NULL; | |
319 | ||
ef9a9d11 | 320 | rcu_read_lock(); |
300aaeea YH |
321 | |
322 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
323 | ||
324 | if (!kp) { | |
325 | /* We don't try hard to allocate much memory for | |
326 | * non-root users. | |
327 | * For root users, retry allocating enough memory for | |
328 | * the answer. | |
329 | */ | |
330 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
331 | if (!kp) { | |
332 | ret = -ENOMEM; | |
333 | goto out; | |
334 | } | |
335 | } | |
336 | ||
337 | c = 0; | |
ef9a9d11 | 338 | for_each_prl_rcu(t->prl) { |
298bf12d | 339 | if (c >= cmax) |
300aaeea | 340 | break; |
2b4743bd | 341 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
342 | continue; |
343 | kp[c].addr = prl->addr; | |
344 | kp[c].flags = prl->flags; | |
345 | c++; | |
2b4743bd | 346 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
347 | break; |
348 | } | |
349 | out: | |
ef9a9d11 | 350 | rcu_read_unlock(); |
300aaeea YH |
351 | |
352 | len = sizeof(*kp) * c; | |
2b4743bd YH |
353 | ret = 0; |
354 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
355 | ret = -EFAULT; | |
300aaeea YH |
356 | |
357 | kfree(kp); | |
300aaeea | 358 | |
2b4743bd | 359 | return ret; |
300aaeea YH |
360 | } |
361 | ||
fadf6bf0 TF |
362 | static int |
363 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
364 | { | |
365 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
366 | int err = 0; |
367 | ||
0009ae1f YH |
368 | if (a->addr == htonl(INADDR_ANY)) |
369 | return -EINVAL; | |
370 | ||
aac4dddc | 371 | ASSERT_RTNL(); |
fadf6bf0 | 372 | |
3a43be3c | 373 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 374 | if (p->addr == a->addr) { |
ef9a9d11 ED |
375 | if (chg) { |
376 | p->flags = a->flags; | |
377 | goto out; | |
378 | } | |
3fcfa129 YH |
379 | err = -EEXIST; |
380 | goto out; | |
fadf6bf0 TF |
381 | } |
382 | } | |
383 | ||
3fcfa129 YH |
384 | if (chg) { |
385 | err = -ENXIO; | |
386 | goto out; | |
387 | } | |
fadf6bf0 TF |
388 | |
389 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
390 | if (!p) { |
391 | err = -ENOBUFS; | |
392 | goto out; | |
393 | } | |
fadf6bf0 | 394 | |
fadf6bf0 | 395 | p->next = t->prl; |
300aaeea YH |
396 | p->addr = a->addr; |
397 | p->flags = a->flags; | |
ef9a9d11 ED |
398 | t->prl_count++; |
399 | rcu_assign_pointer(t->prl, p); | |
3fcfa129 | 400 | out: |
3fcfa129 | 401 | return err; |
fadf6bf0 TF |
402 | } |
403 | ||
ef9a9d11 ED |
404 | static void prl_entry_destroy_rcu(struct rcu_head *head) |
405 | { | |
406 | kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head)); | |
407 | } | |
408 | ||
409 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
410 | { | |
411 | struct ip_tunnel_prl_entry *p, *n; | |
412 | ||
413 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
414 | do { | |
753ea8e9 | 415 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
416 | kfree(p); |
417 | p = n; | |
418 | } while (p); | |
419 | } | |
420 | ||
fadf6bf0 TF |
421 | static int |
422 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
423 | { | |
753ea8e9 ED |
424 | struct ip_tunnel_prl_entry *x; |
425 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
426 | int err = 0; |
427 | ||
aac4dddc | 428 | ASSERT_RTNL(); |
fadf6bf0 | 429 | |
0009ae1f | 430 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
431 | for (p = &t->prl; |
432 | (x = rtnl_dereference(*p)) != NULL; | |
433 | p = &x->next) { | |
434 | if (x->addr == a->addr) { | |
fadf6bf0 | 435 | *p = x->next; |
ef9a9d11 | 436 | call_rcu(&x->rcu_head, prl_entry_destroy_rcu); |
300aaeea | 437 | t->prl_count--; |
3fcfa129 | 438 | goto out; |
fadf6bf0 TF |
439 | } |
440 | } | |
3fcfa129 | 441 | err = -ENXIO; |
fadf6bf0 | 442 | } else { |
753ea8e9 ED |
443 | x = rtnl_dereference(t->prl); |
444 | if (x) { | |
ef9a9d11 | 445 | t->prl_count = 0; |
ef9a9d11 ED |
446 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
447 | t->prl = NULL; | |
fadf6bf0 TF |
448 | } |
449 | } | |
3fcfa129 | 450 | out: |
4b279601 | 451 | return err; |
fadf6bf0 TF |
452 | } |
453 | ||
fadf6bf0 | 454 | static int |
b71d1d42 | 455 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 456 | { |
3fcfa129 | 457 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
458 | int ok = 1; |
459 | ||
ef9a9d11 | 460 | rcu_read_lock(); |
3fcfa129 | 461 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 462 | if (p) { |
300aaeea | 463 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
464 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
465 | else | |
466 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
467 | } else { | |
b71d1d42 ED |
468 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
469 | ||
fadf6bf0 TF |
470 | if (ipv6_addr_is_isatap(addr6) && |
471 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 472 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
473 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
474 | else | |
475 | ok = 0; | |
476 | } | |
ef9a9d11 | 477 | rcu_read_unlock(); |
fadf6bf0 TF |
478 | return ok; |
479 | } | |
480 | ||
1da177e4 LT |
481 | static void ipip6_tunnel_uninit(struct net_device *dev) |
482 | { | |
ca8def14 PE |
483 | struct net *net = dev_net(dev); |
484 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
485 | ||
cd3dbc19 | 486 | if (dev == sitn->fb_tunnel_dev) { |
3a43be3c | 487 | rcu_assign_pointer(sitn->tunnels_wc[0], NULL); |
1da177e4 | 488 | } else { |
ca8def14 | 489 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 490 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 491 | } |
3a43be3c | 492 | dev_put(dev); |
1da177e4 LT |
493 | } |
494 | ||
495 | ||
c73cb5a2 | 496 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 497 | { |
1da177e4 | 498 | |
071f92d0 | 499 | /* All the routers (except for Linux) return only |
1da177e4 LT |
500 | 8 bytes of packet payload. It means, that precise relaying of |
501 | ICMP in the real Internet is absolutely infeasible. | |
502 | */ | |
b71d1d42 | 503 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
504 | const int type = icmp_hdr(skb)->type; |
505 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 506 | struct ip_tunnel *t; |
c73cb5a2 | 507 | int err; |
1da177e4 LT |
508 | |
509 | switch (type) { | |
510 | default: | |
511 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 512 | return 0; |
1da177e4 LT |
513 | |
514 | case ICMP_DEST_UNREACH: | |
515 | switch (code) { | |
516 | case ICMP_SR_FAILED: | |
517 | case ICMP_PORT_UNREACH: | |
518 | /* Impossible event. */ | |
c73cb5a2 | 519 | return 0; |
1da177e4 LT |
520 | case ICMP_FRAG_NEEDED: |
521 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 522 | return 0; |
1da177e4 LT |
523 | default: |
524 | /* All others are translated to HOST_UNREACH. | |
525 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
526 | I believe they are just ether pollution. --ANK | |
527 | */ | |
528 | break; | |
529 | } | |
530 | break; | |
531 | case ICMP_TIME_EXCEEDED: | |
532 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 533 | return 0; |
1da177e4 LT |
534 | break; |
535 | } | |
536 | ||
c73cb5a2 KM |
537 | err = -ENOENT; |
538 | ||
4543c10d | 539 | rcu_read_lock(); |
4fddbf5d SH |
540 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
541 | skb->dev, | |
542 | iph->daddr, | |
543 | iph->saddr); | |
1da177e4 LT |
544 | if (t == NULL || t->parms.iph.daddr == 0) |
545 | goto out; | |
c73cb5a2 KM |
546 | |
547 | err = 0; | |
1da177e4 LT |
548 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
549 | goto out; | |
550 | ||
bb80087a | 551 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
552 | t->err_count++; |
553 | else | |
554 | t->err_count = 1; | |
555 | t->err_time = jiffies; | |
556 | out: | |
4543c10d | 557 | rcu_read_unlock(); |
c73cb5a2 | 558 | return err; |
1da177e4 LT |
559 | } |
560 | ||
b71d1d42 | 561 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
562 | { |
563 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 564 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
565 | } |
566 | ||
567 | static int ipip6_rcv(struct sk_buff *skb) | |
568 | { | |
b71d1d42 | 569 | const struct iphdr *iph; |
1da177e4 LT |
570 | struct ip_tunnel *tunnel; |
571 | ||
572 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
573 | goto out; | |
574 | ||
eddc9ec5 | 575 | iph = ip_hdr(skb); |
1da177e4 | 576 | |
4543c10d | 577 | rcu_read_lock(); |
4fddbf5d SH |
578 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
579 | iph->saddr, iph->daddr); | |
580 | if (tunnel != NULL) { | |
15fc1f70 ED |
581 | struct pcpu_tstats *tstats; |
582 | ||
1da177e4 | 583 | secpath_reset(skb); |
b0e380b1 | 584 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 585 | skb_reset_network_header(skb); |
8cdfab8a | 586 | IPCB(skb)->flags = 0; |
1da177e4 LT |
587 | skb->protocol = htons(ETH_P_IPV6); |
588 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
589 | |
590 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 591 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 592 | tunnel->dev->stats.rx_errors++; |
4543c10d | 593 | rcu_read_unlock(); |
c7dc89c0 FT |
594 | kfree_skb(skb); |
595 | return 0; | |
596 | } | |
d19d56dd | 597 | |
15fc1f70 ED |
598 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
599 | tstats->rx_packets++; | |
600 | tstats->rx_bytes += skb->len; | |
601 | ||
602 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 603 | |
1da177e4 | 604 | ipip6_ecn_decapsulate(iph, skb); |
8990f468 | 605 | |
caf586e5 | 606 | netif_rx(skb); |
8990f468 | 607 | |
4543c10d | 608 | rcu_read_unlock(); |
1da177e4 LT |
609 | return 0; |
610 | } | |
611 | ||
6dcdd1b3 | 612 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
4543c10d | 613 | rcu_read_unlock(); |
6dcdd1b3 | 614 | return 1; |
1da177e4 | 615 | out: |
36ca34cc | 616 | kfree_skb(skb); |
1da177e4 LT |
617 | return 0; |
618 | } | |
619 | ||
fa857afc YH |
620 | /* |
621 | * Returns the embedded IPv4 address if the IPv6 address | |
622 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
623 | */ | |
624 | static inline | |
b71d1d42 | 625 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) |
1da177e4 | 626 | { |
e69a4adc | 627 | __be32 dst = 0; |
1da177e4 | 628 | |
fa857afc YH |
629 | #ifdef CONFIG_IPV6_SIT_6RD |
630 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
631 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 632 | unsigned int pbw0, pbi0; |
fa857afc YH |
633 | int pbi1; |
634 | u32 d; | |
635 | ||
636 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
637 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
638 | ||
e7db38c3 | 639 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
640 | tunnel->ip6rd.relay_prefixlen; |
641 | ||
642 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
643 | if (pbi1 > 0) | |
e7db38c3 | 644 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
645 | (32 - pbi1); |
646 | ||
647 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
648 | } | |
649 | #else | |
1da177e4 | 650 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 651 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
652 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
653 | } | |
fa857afc | 654 | #endif |
1da177e4 LT |
655 | return dst; |
656 | } | |
657 | ||
658 | /* | |
659 | * This function assumes it is being called from dev_queue_xmit() | |
660 | * and that skb is filled properly by that function. | |
661 | */ | |
662 | ||
6fef4c0c SH |
663 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
664 | struct net_device *dev) | |
1da177e4 | 665 | { |
2941a486 | 666 | struct ip_tunnel *tunnel = netdev_priv(dev); |
15fc1f70 | 667 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
668 | const struct iphdr *tiph = &tunnel->parms.iph; |
669 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 670 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 671 | __be16 df = tiph->frag_off; |
1da177e4 | 672 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 673 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 674 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 675 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 676 | __be32 dst = tiph->daddr; |
31e4543d | 677 | struct flowi4 fl4; |
1da177e4 | 678 | int mtu; |
b71d1d42 | 679 | const struct in6_addr *addr6; |
1da177e4 LT |
680 | int addr_type; |
681 | ||
1da177e4 LT |
682 | if (skb->protocol != htons(ETH_P_IPV6)) |
683 | goto tx_error; | |
684 | ||
c7dc89c0 FT |
685 | /* ISATAP (RFC4214) - must come before 6to4 */ |
686 | if (dev->priv_flags & IFF_ISATAP) { | |
687 | struct neighbour *neigh = NULL; | |
688 | ||
adf30907 ED |
689 | if (skb_dst(skb)) |
690 | neigh = skb_dst(skb)->neighbour; | |
c7dc89c0 FT |
691 | |
692 | if (neigh == NULL) { | |
693 | if (net_ratelimit()) | |
694 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
695 | goto tx_error; | |
696 | } | |
697 | ||
b71d1d42 | 698 | addr6 = (const struct in6_addr*)&neigh->primary_key; |
c7dc89c0 FT |
699 | addr_type = ipv6_addr_type(addr6); |
700 | ||
701 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
702 | ipv6_addr_is_isatap(addr6)) | |
703 | dst = addr6->s6_addr32[3]; | |
704 | else | |
705 | goto tx_error; | |
706 | } | |
707 | ||
1da177e4 | 708 | if (!dst) |
fa857afc | 709 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
710 | |
711 | if (!dst) { | |
712 | struct neighbour *neigh = NULL; | |
713 | ||
adf30907 ED |
714 | if (skb_dst(skb)) |
715 | neigh = skb_dst(skb)->neighbour; | |
1da177e4 LT |
716 | |
717 | if (neigh == NULL) { | |
718 | if (net_ratelimit()) | |
719 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
720 | goto tx_error; | |
721 | } | |
722 | ||
b71d1d42 | 723 | addr6 = (const struct in6_addr*)&neigh->primary_key; |
1da177e4 LT |
724 | addr_type = ipv6_addr_type(addr6); |
725 | ||
726 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 727 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
728 | addr_type = ipv6_addr_type(addr6); |
729 | } | |
730 | ||
731 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
732 | goto tx_error_icmp; | |
733 | ||
734 | dst = addr6->s6_addr32[3]; | |
735 | } | |
736 | ||
31e4543d | 737 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
738 | dst, tiph->saddr, |
739 | 0, 0, | |
740 | IPPROTO_IPV6, RT_TOS(tos), | |
741 | tunnel->parms.link); | |
742 | if (IS_ERR(rt)) { | |
743 | dev->stats.tx_carrier_errors++; | |
744 | goto tx_error_icmp; | |
1da177e4 LT |
745 | } |
746 | if (rt->rt_type != RTN_UNICAST) { | |
747 | ip_rt_put(rt); | |
15fc1f70 | 748 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
749 | goto tx_error_icmp; |
750 | } | |
d8d1f30b | 751 | tdev = rt->dst.dev; |
1da177e4 LT |
752 | |
753 | if (tdev == dev) { | |
754 | ip_rt_put(rt); | |
15fc1f70 | 755 | dev->stats.collisions++; |
1da177e4 LT |
756 | goto tx_error; |
757 | } | |
758 | ||
292f4f3c | 759 | if (df) { |
d8d1f30b | 760 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 761 | |
292f4f3c | 762 | if (mtu < 68) { |
15fc1f70 | 763 | dev->stats.collisions++; |
292f4f3c HX |
764 | ip_rt_put(rt); |
765 | goto tx_error; | |
766 | } | |
1da177e4 | 767 | |
292f4f3c HX |
768 | if (mtu < IPV6_MIN_MTU) { |
769 | mtu = IPV6_MIN_MTU; | |
770 | df = 0; | |
771 | } | |
772 | ||
773 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
774 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
775 | ||
776 | if (skb->len > mtu) { | |
3ffe533c | 777 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
778 | ip_rt_put(rt); |
779 | goto tx_error; | |
780 | } | |
1da177e4 LT |
781 | } |
782 | ||
783 | if (tunnel->err_count > 0) { | |
bb80087a WY |
784 | if (time_before(jiffies, |
785 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
786 | tunnel->err_count--; |
787 | dst_link_failure(skb); | |
788 | } else | |
789 | tunnel->err_count = 0; | |
790 | } | |
791 | ||
792 | /* | |
793 | * Okay, now see if we can stuff it in the buffer as-is. | |
794 | */ | |
795 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
796 | ||
cfbba49d PM |
797 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
798 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
799 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
800 | if (!new_skb) { | |
801 | ip_rt_put(rt); | |
15fc1f70 | 802 | dev->stats.tx_dropped++; |
1da177e4 | 803 | dev_kfree_skb(skb); |
6ed10654 | 804 | return NETDEV_TX_OK; |
1da177e4 LT |
805 | } |
806 | if (skb->sk) | |
807 | skb_set_owner_w(new_skb, skb->sk); | |
808 | dev_kfree_skb(skb); | |
809 | skb = new_skb; | |
0660e03f | 810 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
811 | } |
812 | ||
b0e380b1 | 813 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
814 | skb_push(skb, sizeof(struct iphdr)); |
815 | skb_reset_network_header(skb); | |
1da177e4 | 816 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 817 | IPCB(skb)->flags = 0; |
adf30907 | 818 | skb_dst_drop(skb); |
d8d1f30b | 819 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
820 | |
821 | /* | |
822 | * Push down and install the IPIP header. | |
823 | */ | |
824 | ||
eddc9ec5 | 825 | iph = ip_hdr(skb); |
1da177e4 LT |
826 | iph->version = 4; |
827 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 828 | iph->frag_off = df; |
1da177e4 LT |
829 | iph->protocol = IPPROTO_IPV6; |
830 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
831 | iph->daddr = rt->rt_dst; | |
832 | iph->saddr = rt->rt_src; | |
833 | ||
834 | if ((iph->ttl = tiph->ttl) == 0) | |
835 | iph->ttl = iph6->hop_limit; | |
836 | ||
837 | nf_reset(skb); | |
15fc1f70 ED |
838 | tstats = this_cpu_ptr(dev->tstats); |
839 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 840 | return NETDEV_TX_OK; |
1da177e4 LT |
841 | |
842 | tx_error_icmp: | |
843 | dst_link_failure(skb); | |
844 | tx_error: | |
15fc1f70 | 845 | dev->stats.tx_errors++; |
1da177e4 | 846 | dev_kfree_skb(skb); |
6ed10654 | 847 | return NETDEV_TX_OK; |
1da177e4 LT |
848 | } |
849 | ||
8a4a50f9 MS |
850 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
851 | { | |
852 | struct net_device *tdev = NULL; | |
853 | struct ip_tunnel *tunnel; | |
b71d1d42 | 854 | const struct iphdr *iph; |
31e4543d | 855 | struct flowi4 fl4; |
8a4a50f9 MS |
856 | |
857 | tunnel = netdev_priv(dev); | |
858 | iph = &tunnel->parms.iph; | |
859 | ||
860 | if (iph->daddr) { | |
31e4543d | 861 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
862 | iph->daddr, iph->saddr, |
863 | 0, 0, | |
864 | IPPROTO_IPV6, | |
865 | RT_TOS(iph->tos), | |
866 | tunnel->parms.link); | |
b23dd4fe DM |
867 | |
868 | if (!IS_ERR(rt)) { | |
d8d1f30b | 869 | tdev = rt->dst.dev; |
8a4a50f9 MS |
870 | ip_rt_put(rt); |
871 | } | |
872 | dev->flags |= IFF_POINTOPOINT; | |
873 | } | |
874 | ||
875 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 876 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
877 | |
878 | if (tdev) { | |
879 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
880 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
881 | if (dev->mtu < IPV6_MIN_MTU) | |
882 | dev->mtu = IPV6_MIN_MTU; | |
883 | } | |
884 | dev->iflink = tunnel->parms.link; | |
885 | } | |
886 | ||
1da177e4 LT |
887 | static int |
888 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
889 | { | |
890 | int err = 0; | |
891 | struct ip_tunnel_parm p; | |
fadf6bf0 | 892 | struct ip_tunnel_prl prl; |
1da177e4 | 893 | struct ip_tunnel *t; |
ca8def14 PE |
894 | struct net *net = dev_net(dev); |
895 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
896 | #ifdef CONFIG_IPV6_SIT_6RD |
897 | struct ip_tunnel_6rd ip6rd; | |
898 | #endif | |
1da177e4 LT |
899 | |
900 | switch (cmd) { | |
901 | case SIOCGETTUNNEL: | |
fa857afc YH |
902 | #ifdef CONFIG_IPV6_SIT_6RD |
903 | case SIOCGET6RD: | |
904 | #endif | |
1da177e4 | 905 | t = NULL; |
cd3dbc19 | 906 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
907 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
908 | err = -EFAULT; | |
909 | break; | |
910 | } | |
ca8def14 | 911 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
912 | } |
913 | if (t == NULL) | |
2941a486 | 914 | t = netdev_priv(dev); |
fa857afc YH |
915 | |
916 | err = -EFAULT; | |
917 | if (cmd == SIOCGETTUNNEL) { | |
918 | memcpy(&p, &t->parms, sizeof(p)); | |
919 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
920 | sizeof(p))) | |
921 | goto done; | |
922 | #ifdef CONFIG_IPV6_SIT_6RD | |
923 | } else { | |
924 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
925 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
926 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
927 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
928 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
929 | sizeof(ip6rd))) | |
930 | goto done; | |
931 | #endif | |
932 | } | |
933 | err = 0; | |
1da177e4 LT |
934 | break; |
935 | ||
936 | case SIOCADDTUNNEL: | |
937 | case SIOCCHGTUNNEL: | |
938 | err = -EPERM; | |
939 | if (!capable(CAP_NET_ADMIN)) | |
940 | goto done; | |
941 | ||
942 | err = -EFAULT; | |
943 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
944 | goto done; | |
945 | ||
946 | err = -EINVAL; | |
947 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
948 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
949 | goto done; | |
950 | if (p.iph.ttl) | |
951 | p.iph.frag_off |= htons(IP_DF); | |
952 | ||
ca8def14 | 953 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 954 | |
cd3dbc19 | 955 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
956 | if (t != NULL) { |
957 | if (t->dev != dev) { | |
958 | err = -EEXIST; | |
959 | break; | |
960 | } | |
961 | } else { | |
962 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
963 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
964 | err = -EINVAL; | |
965 | break; | |
966 | } | |
2941a486 | 967 | t = netdev_priv(dev); |
ca8def14 | 968 | ipip6_tunnel_unlink(sitn, t); |
74b0b85b | 969 | synchronize_net(); |
1da177e4 LT |
970 | t->parms.iph.saddr = p.iph.saddr; |
971 | t->parms.iph.daddr = p.iph.daddr; | |
972 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
973 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 974 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
975 | netdev_state_change(dev); |
976 | } | |
977 | } | |
978 | ||
979 | if (t) { | |
980 | err = 0; | |
981 | if (cmd == SIOCCHGTUNNEL) { | |
982 | t->parms.iph.ttl = p.iph.ttl; | |
983 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
984 | if (t->parms.link != p.link) { |
985 | t->parms.link = p.link; | |
986 | ipip6_tunnel_bind_dev(dev); | |
987 | netdev_state_change(dev); | |
988 | } | |
1da177e4 LT |
989 | } |
990 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
991 | err = -EFAULT; | |
992 | } else | |
993 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
994 | break; | |
995 | ||
996 | case SIOCDELTUNNEL: | |
997 | err = -EPERM; | |
998 | if (!capable(CAP_NET_ADMIN)) | |
999 | goto done; | |
1000 | ||
cd3dbc19 | 1001 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1002 | err = -EFAULT; |
1003 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1004 | goto done; | |
1005 | err = -ENOENT; | |
ca8def14 | 1006 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1007 | goto done; |
1008 | err = -EPERM; | |
cd3dbc19 | 1009 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1010 | goto done; |
1011 | dev = t->dev; | |
1012 | } | |
22f8cde5 SH |
1013 | unregister_netdevice(dev); |
1014 | err = 0; | |
1da177e4 LT |
1015 | break; |
1016 | ||
300aaeea | 1017 | case SIOCGETPRL: |
2b4743bd YH |
1018 | err = -EINVAL; |
1019 | if (dev == sitn->fb_tunnel_dev) | |
1020 | goto done; | |
1021 | err = -ENOENT; | |
1022 | if (!(t = netdev_priv(dev))) | |
1023 | goto done; | |
1024 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1025 | break; | |
1026 | ||
fadf6bf0 TF |
1027 | case SIOCADDPRL: |
1028 | case SIOCDELPRL: | |
1029 | case SIOCCHGPRL: | |
1030 | err = -EPERM; | |
2b4743bd | 1031 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1032 | goto done; |
1033 | err = -EINVAL; | |
cd3dbc19 | 1034 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1035 | goto done; |
1036 | err = -EFAULT; | |
1037 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1038 | goto done; | |
1039 | err = -ENOENT; | |
1040 | if (!(t = netdev_priv(dev))) | |
1041 | goto done; | |
1042 | ||
300aaeea | 1043 | switch (cmd) { |
300aaeea | 1044 | case SIOCDELPRL: |
fadf6bf0 | 1045 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1046 | break; |
1047 | case SIOCADDPRL: | |
1048 | case SIOCCHGPRL: | |
fadf6bf0 | 1049 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1050 | break; |
1051 | } | |
2b4743bd | 1052 | netdev_state_change(dev); |
fadf6bf0 TF |
1053 | break; |
1054 | ||
fa857afc YH |
1055 | #ifdef CONFIG_IPV6_SIT_6RD |
1056 | case SIOCADD6RD: | |
1057 | case SIOCCHG6RD: | |
1058 | case SIOCDEL6RD: | |
1059 | err = -EPERM; | |
1060 | if (!capable(CAP_NET_ADMIN)) | |
1061 | goto done; | |
1062 | ||
1063 | err = -EFAULT; | |
1064 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1065 | sizeof(ip6rd))) | |
1066 | goto done; | |
1067 | ||
1068 | t = netdev_priv(dev); | |
1069 | ||
1070 | if (cmd != SIOCDEL6RD) { | |
1071 | struct in6_addr prefix; | |
1072 | __be32 relay_prefix; | |
1073 | ||
1074 | err = -EINVAL; | |
1075 | if (ip6rd.relay_prefixlen > 32 || | |
1076 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1077 | goto done; | |
1078 | ||
1079 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1080 | ip6rd.prefixlen); | |
1081 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1082 | goto done; | |
91b2a3f9 YH |
1083 | if (ip6rd.relay_prefixlen) |
1084 | relay_prefix = ip6rd.relay_prefix & | |
1085 | htonl(0xffffffffUL << | |
1086 | (32 - ip6rd.relay_prefixlen)); | |
1087 | else | |
1088 | relay_prefix = 0; | |
fa857afc YH |
1089 | if (relay_prefix != ip6rd.relay_prefix) |
1090 | goto done; | |
1091 | ||
1092 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1093 | t->ip6rd.relay_prefix = relay_prefix; | |
1094 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1095 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1096 | } else | |
e0c93948 | 1097 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1098 | |
1099 | err = 0; | |
1100 | break; | |
1101 | #endif | |
1102 | ||
1da177e4 LT |
1103 | default: |
1104 | err = -EINVAL; | |
1105 | } | |
1106 | ||
1107 | done: | |
1108 | return err; | |
1109 | } | |
1110 | ||
1da177e4 LT |
1111 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1112 | { | |
1113 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1114 | return -EINVAL; | |
1115 | dev->mtu = new_mtu; | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1326c3d5 SH |
1119 | static const struct net_device_ops ipip6_netdev_ops = { |
1120 | .ndo_uninit = ipip6_tunnel_uninit, | |
1121 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1122 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1123 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
15fc1f70 | 1124 | .ndo_get_stats = ipip6_get_stats, |
1326c3d5 SH |
1125 | }; |
1126 | ||
15fc1f70 ED |
1127 | static void ipip6_dev_free(struct net_device *dev) |
1128 | { | |
1129 | free_percpu(dev->tstats); | |
1130 | free_netdev(dev); | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | static void ipip6_tunnel_setup(struct net_device *dev) |
1134 | { | |
1326c3d5 | 1135 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1136 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1137 | |
1138 | dev->type = ARPHRD_SIT; | |
1139 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1140 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1141 | dev->flags = IFF_NOARP; |
f2ba025b | 1142 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1143 | dev->iflink = 0; |
1144 | dev->addr_len = 4; | |
7a97146c | 1145 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1146 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1147 | } |
1148 | ||
15fc1f70 | 1149 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1150 | { |
1326c3d5 | 1151 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1152 | |
1153 | tunnel->dev = dev; | |
1154 | strcpy(tunnel->parms.name, dev->name); | |
1155 | ||
1156 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1157 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1158 | ||
8a4a50f9 | 1159 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1160 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1161 | if (!dev->tstats) | |
1162 | return -ENOMEM; | |
1163 | ||
1164 | return 0; | |
1da177e4 LT |
1165 | } |
1166 | ||
dd4080ee | 1167 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1168 | { |
2941a486 | 1169 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1170 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1171 | struct net *net = dev_net(dev); |
1172 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1173 | |
1174 | tunnel->dev = dev; | |
1175 | strcpy(tunnel->parms.name, dev->name); | |
1176 | ||
1177 | iph->version = 4; | |
1178 | iph->protocol = IPPROTO_IPV6; | |
1179 | iph->ihl = 5; | |
1180 | iph->ttl = 64; | |
1181 | ||
dd4080ee ED |
1182 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1183 | if (!dev->tstats) | |
1184 | return -ENOMEM; | |
1da177e4 | 1185 | dev_hold(dev); |
753ea8e9 | 1186 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1187 | return 0; |
1da177e4 LT |
1188 | } |
1189 | ||
6dcd814b | 1190 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1191 | .handler = ipip6_rcv, |
1192 | .err_handler = ipip6_err, | |
c73cb5a2 | 1193 | .priority = 1, |
1da177e4 LT |
1194 | }; |
1195 | ||
2c8c1e72 | 1196 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1197 | { |
1198 | int prio; | |
1199 | ||
1200 | for (prio = 1; prio < 4; prio++) { | |
1201 | int h; | |
1202 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1203 | struct ip_tunnel *t; |
62808f91 | 1204 | |
753ea8e9 | 1205 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1206 | while (t != NULL) { |
1207 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1208 | t = rtnl_dereference(t->next); |
62808f91 | 1209 | } |
db44575f AK |
1210 | } |
1211 | } | |
1212 | } | |
1213 | ||
2c8c1e72 | 1214 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1215 | { |
67101172 | 1216 | struct sit_net *sitn = net_generic(net, sit_net_id); |
8190d900 | 1217 | int err; |
8190d900 | 1218 | |
29182176 PE |
1219 | sitn->tunnels[0] = sitn->tunnels_wc; |
1220 | sitn->tunnels[1] = sitn->tunnels_l; | |
1221 | sitn->tunnels[2] = sitn->tunnels_r; | |
1222 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1223 | ||
cd3dbc19 PE |
1224 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1225 | ipip6_tunnel_setup); | |
1226 | if (!sitn->fb_tunnel_dev) { | |
1227 | err = -ENOMEM; | |
1228 | goto err_alloc_dev; | |
1229 | } | |
be77e593 | 1230 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1231 | |
dd4080ee ED |
1232 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1233 | if (err) | |
1234 | goto err_dev_free; | |
1235 | ||
e0c93948 | 1236 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1237 | |
1238 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1239 | goto err_reg_dev; | |
1240 | ||
8190d900 PE |
1241 | return 0; |
1242 | ||
cd3dbc19 | 1243 | err_reg_dev: |
1326c3d5 | 1244 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1245 | err_dev_free: |
1246 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1247 | err_alloc_dev: |
8190d900 PE |
1248 | return err; |
1249 | } | |
1250 | ||
2c8c1e72 | 1251 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1252 | { |
67101172 | 1253 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1254 | LIST_HEAD(list); |
8190d900 | 1255 | |
cd3dbc19 | 1256 | rtnl_lock(); |
62808f91 ED |
1257 | sit_destroy_tunnels(sitn, &list); |
1258 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1259 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1260 | rtnl_unlock(); |
8190d900 PE |
1261 | } |
1262 | ||
1263 | static struct pernet_operations sit_net_ops = { | |
1264 | .init = sit_init_net, | |
1265 | .exit = sit_exit_net, | |
67101172 EB |
1266 | .id = &sit_net_id, |
1267 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1268 | }; |
1269 | ||
89c89458 | 1270 | static void __exit sit_cleanup(void) |
1da177e4 | 1271 | { |
c73cb5a2 | 1272 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1273 | |
67101172 | 1274 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1275 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1276 | } |
1277 | ||
89c89458 | 1278 | static int __init sit_init(void) |
1da177e4 LT |
1279 | { |
1280 | int err; | |
1281 | ||
1282 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1283 | ||
67101172 | 1284 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1285 | if (err < 0) |
d5aa407f AD |
1286 | return err; |
1287 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1288 | if (err < 0) { | |
1289 | unregister_pernet_device(&sit_net_ops); | |
1290 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
1291 | } | |
1da177e4 | 1292 | return err; |
1da177e4 | 1293 | } |
989e5b96 JR |
1294 | |
1295 | module_init(sit_init); | |
1296 | module_exit(sit_cleanup); | |
39c85086 | 1297 | MODULE_LICENSE("GPL"); |
8909c9ad | 1298 | MODULE_ALIAS_NETDEV("sit0"); |