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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) { | |
a9b3cd7f | 185 | RCU_INIT_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 | |
a9b3cd7f SH |
195 | RCU_INIT_POINTER(t->next, rtnl_dereference(*tp)); |
196 | RCU_INIT_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 | ||
2941a486 | 253 | nt = netdev_priv(dev); |
1326c3d5 | 254 | |
1da177e4 | 255 | nt->parms = *parms; |
15fc1f70 ED |
256 | if (ipip6_tunnel_init(dev) < 0) |
257 | goto failed_free; | |
e0c93948 | 258 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 259 | |
c7dc89c0 FT |
260 | if (parms->i_flags & SIT_ISATAP) |
261 | dev->priv_flags |= IFF_ISATAP; | |
262 | ||
b37d428b PE |
263 | if (register_netdevice(dev) < 0) |
264 | goto failed_free; | |
1da177e4 LT |
265 | |
266 | dev_hold(dev); | |
267 | ||
ca8def14 | 268 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
269 | return nt; |
270 | ||
b37d428b | 271 | failed_free: |
15fc1f70 | 272 | ipip6_dev_free(dev); |
1da177e4 LT |
273 | failed: |
274 | return NULL; | |
275 | } | |
276 | ||
ef9a9d11 ED |
277 | #define for_each_prl_rcu(start) \ |
278 | for (prl = rcu_dereference(start); \ | |
279 | prl; \ | |
280 | prl = rcu_dereference(prl->next)) | |
281 | ||
fadf6bf0 | 282 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 283 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 284 | { |
ef9a9d11 | 285 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 286 | |
ef9a9d11 ED |
287 | for_each_prl_rcu(t->prl) |
288 | if (prl->addr == addr) | |
fadf6bf0 | 289 | break; |
ef9a9d11 | 290 | return prl; |
fadf6bf0 TF |
291 | |
292 | } | |
293 | ||
2b4743bd YH |
294 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
295 | struct ip_tunnel_prl __user *a) | |
300aaeea | 296 | { |
2b4743bd | 297 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
298 | struct ip_tunnel_prl_entry *prl; |
299 | unsigned int cmax, c = 0, ca, len; | |
300 | int ret = 0; | |
301 | ||
2b4743bd YH |
302 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
303 | return -EFAULT; | |
304 | cmax = kprl.datalen / sizeof(kprl); | |
305 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
306 | cmax = 1; |
307 | ||
308 | /* For simple GET or for root users, | |
309 | * we try harder to allocate. | |
310 | */ | |
311 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
312 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
313 | NULL; | |
314 | ||
ef9a9d11 | 315 | rcu_read_lock(); |
300aaeea YH |
316 | |
317 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
318 | ||
319 | if (!kp) { | |
320 | /* We don't try hard to allocate much memory for | |
321 | * non-root users. | |
322 | * For root users, retry allocating enough memory for | |
323 | * the answer. | |
324 | */ | |
325 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
326 | if (!kp) { | |
327 | ret = -ENOMEM; | |
328 | goto out; | |
329 | } | |
330 | } | |
331 | ||
332 | c = 0; | |
ef9a9d11 | 333 | for_each_prl_rcu(t->prl) { |
298bf12d | 334 | if (c >= cmax) |
300aaeea | 335 | break; |
2b4743bd | 336 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
337 | continue; |
338 | kp[c].addr = prl->addr; | |
339 | kp[c].flags = prl->flags; | |
340 | c++; | |
2b4743bd | 341 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
342 | break; |
343 | } | |
344 | out: | |
ef9a9d11 | 345 | rcu_read_unlock(); |
300aaeea YH |
346 | |
347 | len = sizeof(*kp) * c; | |
2b4743bd YH |
348 | ret = 0; |
349 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
350 | ret = -EFAULT; | |
300aaeea YH |
351 | |
352 | kfree(kp); | |
300aaeea | 353 | |
2b4743bd | 354 | return ret; |
300aaeea YH |
355 | } |
356 | ||
fadf6bf0 TF |
357 | static int |
358 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
359 | { | |
360 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
361 | int err = 0; |
362 | ||
0009ae1f YH |
363 | if (a->addr == htonl(INADDR_ANY)) |
364 | return -EINVAL; | |
365 | ||
aac4dddc | 366 | ASSERT_RTNL(); |
fadf6bf0 | 367 | |
3a43be3c | 368 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 369 | if (p->addr == a->addr) { |
ef9a9d11 ED |
370 | if (chg) { |
371 | p->flags = a->flags; | |
372 | goto out; | |
373 | } | |
3fcfa129 YH |
374 | err = -EEXIST; |
375 | goto out; | |
fadf6bf0 TF |
376 | } |
377 | } | |
378 | ||
3fcfa129 YH |
379 | if (chg) { |
380 | err = -ENXIO; | |
381 | goto out; | |
382 | } | |
fadf6bf0 TF |
383 | |
384 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
385 | if (!p) { |
386 | err = -ENOBUFS; | |
387 | goto out; | |
388 | } | |
fadf6bf0 | 389 | |
fadf6bf0 | 390 | p->next = t->prl; |
300aaeea YH |
391 | p->addr = a->addr; |
392 | p->flags = a->flags; | |
ef9a9d11 | 393 | t->prl_count++; |
a9b3cd7f | 394 | RCU_INIT_POINTER(t->prl, p); |
3fcfa129 | 395 | out: |
3fcfa129 | 396 | return err; |
fadf6bf0 TF |
397 | } |
398 | ||
ef9a9d11 ED |
399 | static void prl_list_destroy_rcu(struct rcu_head *head) |
400 | { | |
401 | struct ip_tunnel_prl_entry *p, *n; | |
402 | ||
403 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
404 | do { | |
753ea8e9 | 405 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
406 | kfree(p); |
407 | p = n; | |
408 | } while (p); | |
409 | } | |
410 | ||
fadf6bf0 TF |
411 | static int |
412 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
413 | { | |
753ea8e9 ED |
414 | struct ip_tunnel_prl_entry *x; |
415 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
416 | int err = 0; |
417 | ||
aac4dddc | 418 | ASSERT_RTNL(); |
fadf6bf0 | 419 | |
0009ae1f | 420 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
421 | for (p = &t->prl; |
422 | (x = rtnl_dereference(*p)) != NULL; | |
423 | p = &x->next) { | |
424 | if (x->addr == a->addr) { | |
fadf6bf0 | 425 | *p = x->next; |
11c476f3 | 426 | kfree_rcu(x, rcu_head); |
300aaeea | 427 | t->prl_count--; |
3fcfa129 | 428 | goto out; |
fadf6bf0 TF |
429 | } |
430 | } | |
3fcfa129 | 431 | err = -ENXIO; |
fadf6bf0 | 432 | } else { |
753ea8e9 ED |
433 | x = rtnl_dereference(t->prl); |
434 | if (x) { | |
ef9a9d11 | 435 | t->prl_count = 0; |
ef9a9d11 ED |
436 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
437 | t->prl = NULL; | |
fadf6bf0 TF |
438 | } |
439 | } | |
3fcfa129 | 440 | out: |
4b279601 | 441 | return err; |
fadf6bf0 TF |
442 | } |
443 | ||
fadf6bf0 | 444 | static int |
b71d1d42 | 445 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 446 | { |
3fcfa129 | 447 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
448 | int ok = 1; |
449 | ||
ef9a9d11 | 450 | rcu_read_lock(); |
3fcfa129 | 451 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 452 | if (p) { |
300aaeea | 453 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
454 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
455 | else | |
456 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
457 | } else { | |
b71d1d42 ED |
458 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
459 | ||
fadf6bf0 TF |
460 | if (ipv6_addr_is_isatap(addr6) && |
461 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 462 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
463 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
464 | else | |
465 | ok = 0; | |
466 | } | |
ef9a9d11 | 467 | rcu_read_unlock(); |
fadf6bf0 TF |
468 | return ok; |
469 | } | |
470 | ||
1da177e4 LT |
471 | static void ipip6_tunnel_uninit(struct net_device *dev) |
472 | { | |
ca8def14 PE |
473 | struct net *net = dev_net(dev); |
474 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
475 | ||
cd3dbc19 | 476 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 477 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 478 | } else { |
ca8def14 | 479 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 480 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 481 | } |
3a43be3c | 482 | dev_put(dev); |
1da177e4 LT |
483 | } |
484 | ||
485 | ||
c73cb5a2 | 486 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 487 | { |
1da177e4 | 488 | |
071f92d0 | 489 | /* All the routers (except for Linux) return only |
1da177e4 LT |
490 | 8 bytes of packet payload. It means, that precise relaying of |
491 | ICMP in the real Internet is absolutely infeasible. | |
492 | */ | |
b71d1d42 | 493 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
494 | const int type = icmp_hdr(skb)->type; |
495 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 496 | struct ip_tunnel *t; |
c73cb5a2 | 497 | int err; |
1da177e4 LT |
498 | |
499 | switch (type) { | |
500 | default: | |
501 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 502 | return 0; |
1da177e4 LT |
503 | |
504 | case ICMP_DEST_UNREACH: | |
505 | switch (code) { | |
506 | case ICMP_SR_FAILED: | |
507 | case ICMP_PORT_UNREACH: | |
508 | /* Impossible event. */ | |
c73cb5a2 | 509 | return 0; |
1da177e4 LT |
510 | case ICMP_FRAG_NEEDED: |
511 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 512 | return 0; |
1da177e4 LT |
513 | default: |
514 | /* All others are translated to HOST_UNREACH. | |
515 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
516 | I believe they are just ether pollution. --ANK | |
517 | */ | |
518 | break; | |
519 | } | |
520 | break; | |
521 | case ICMP_TIME_EXCEEDED: | |
522 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 523 | return 0; |
1da177e4 LT |
524 | break; |
525 | } | |
526 | ||
c73cb5a2 KM |
527 | err = -ENOENT; |
528 | ||
4543c10d | 529 | rcu_read_lock(); |
4fddbf5d SH |
530 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
531 | skb->dev, | |
532 | iph->daddr, | |
533 | iph->saddr); | |
1da177e4 LT |
534 | if (t == NULL || t->parms.iph.daddr == 0) |
535 | goto out; | |
c73cb5a2 KM |
536 | |
537 | err = 0; | |
1da177e4 LT |
538 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
539 | goto out; | |
540 | ||
bb80087a | 541 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
542 | t->err_count++; |
543 | else | |
544 | t->err_count = 1; | |
545 | t->err_time = jiffies; | |
546 | out: | |
4543c10d | 547 | rcu_read_unlock(); |
c73cb5a2 | 548 | return err; |
1da177e4 LT |
549 | } |
550 | ||
b71d1d42 | 551 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
552 | { |
553 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 554 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
555 | } |
556 | ||
557 | static int ipip6_rcv(struct sk_buff *skb) | |
558 | { | |
b71d1d42 | 559 | const struct iphdr *iph; |
1da177e4 LT |
560 | struct ip_tunnel *tunnel; |
561 | ||
562 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
563 | goto out; | |
564 | ||
eddc9ec5 | 565 | iph = ip_hdr(skb); |
1da177e4 | 566 | |
4543c10d | 567 | rcu_read_lock(); |
4fddbf5d SH |
568 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
569 | iph->saddr, iph->daddr); | |
570 | if (tunnel != NULL) { | |
15fc1f70 ED |
571 | struct pcpu_tstats *tstats; |
572 | ||
1da177e4 | 573 | secpath_reset(skb); |
b0e380b1 | 574 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 575 | skb_reset_network_header(skb); |
8cdfab8a | 576 | IPCB(skb)->flags = 0; |
1da177e4 LT |
577 | skb->protocol = htons(ETH_P_IPV6); |
578 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
579 | |
580 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 581 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 582 | tunnel->dev->stats.rx_errors++; |
4543c10d | 583 | rcu_read_unlock(); |
c7dc89c0 FT |
584 | kfree_skb(skb); |
585 | return 0; | |
586 | } | |
d19d56dd | 587 | |
15fc1f70 ED |
588 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
589 | tstats->rx_packets++; | |
590 | tstats->rx_bytes += skb->len; | |
591 | ||
592 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 593 | |
1da177e4 | 594 | ipip6_ecn_decapsulate(iph, skb); |
8990f468 | 595 | |
caf586e5 | 596 | netif_rx(skb); |
8990f468 | 597 | |
4543c10d | 598 | rcu_read_unlock(); |
1da177e4 LT |
599 | return 0; |
600 | } | |
601 | ||
6dcdd1b3 | 602 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
4543c10d | 603 | rcu_read_unlock(); |
6dcdd1b3 | 604 | return 1; |
1da177e4 | 605 | out: |
36ca34cc | 606 | kfree_skb(skb); |
1da177e4 LT |
607 | return 0; |
608 | } | |
609 | ||
fa857afc YH |
610 | /* |
611 | * Returns the embedded IPv4 address if the IPv6 address | |
612 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
613 | */ | |
614 | static inline | |
b71d1d42 | 615 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) |
1da177e4 | 616 | { |
e69a4adc | 617 | __be32 dst = 0; |
1da177e4 | 618 | |
fa857afc YH |
619 | #ifdef CONFIG_IPV6_SIT_6RD |
620 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
621 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 622 | unsigned int pbw0, pbi0; |
fa857afc YH |
623 | int pbi1; |
624 | u32 d; | |
625 | ||
626 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
627 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
628 | ||
e7db38c3 | 629 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
630 | tunnel->ip6rd.relay_prefixlen; |
631 | ||
632 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
633 | if (pbi1 > 0) | |
e7db38c3 | 634 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
635 | (32 - pbi1); |
636 | ||
637 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
638 | } | |
639 | #else | |
1da177e4 | 640 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 641 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
642 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
643 | } | |
fa857afc | 644 | #endif |
1da177e4 LT |
645 | return dst; |
646 | } | |
647 | ||
648 | /* | |
649 | * This function assumes it is being called from dev_queue_xmit() | |
650 | * and that skb is filled properly by that function. | |
651 | */ | |
652 | ||
6fef4c0c SH |
653 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
654 | struct net_device *dev) | |
1da177e4 | 655 | { |
2941a486 | 656 | struct ip_tunnel *tunnel = netdev_priv(dev); |
15fc1f70 | 657 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
658 | const struct iphdr *tiph = &tunnel->parms.iph; |
659 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 660 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 661 | __be16 df = tiph->frag_off; |
1da177e4 | 662 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 663 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 664 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 665 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 666 | __be32 dst = tiph->daddr; |
31e4543d | 667 | struct flowi4 fl4; |
1da177e4 | 668 | int mtu; |
b71d1d42 | 669 | const struct in6_addr *addr6; |
1da177e4 LT |
670 | int addr_type; |
671 | ||
1da177e4 LT |
672 | if (skb->protocol != htons(ETH_P_IPV6)) |
673 | goto tx_error; | |
674 | ||
c2bceb3d LEM |
675 | if (tos == 1) |
676 | tos = ipv6_get_dsfield(iph6); | |
677 | ||
c7dc89c0 FT |
678 | /* ISATAP (RFC4214) - must come before 6to4 */ |
679 | if (dev->priv_flags & IFF_ISATAP) { | |
680 | struct neighbour *neigh = NULL; | |
681 | ||
adf30907 | 682 | if (skb_dst(skb)) |
69cce1d1 | 683 | neigh = dst_get_neighbour(skb_dst(skb)); |
c7dc89c0 FT |
684 | |
685 | if (neigh == NULL) { | |
686 | if (net_ratelimit()) | |
687 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
688 | goto tx_error; | |
689 | } | |
690 | ||
b71d1d42 | 691 | addr6 = (const struct in6_addr*)&neigh->primary_key; |
c7dc89c0 FT |
692 | addr_type = ipv6_addr_type(addr6); |
693 | ||
694 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
695 | ipv6_addr_is_isatap(addr6)) | |
696 | dst = addr6->s6_addr32[3]; | |
697 | else | |
698 | goto tx_error; | |
699 | } | |
700 | ||
1da177e4 | 701 | if (!dst) |
fa857afc | 702 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
703 | |
704 | if (!dst) { | |
705 | struct neighbour *neigh = NULL; | |
706 | ||
adf30907 | 707 | if (skb_dst(skb)) |
69cce1d1 | 708 | neigh = dst_get_neighbour(skb_dst(skb)); |
1da177e4 LT |
709 | |
710 | if (neigh == NULL) { | |
711 | if (net_ratelimit()) | |
712 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
713 | goto tx_error; | |
714 | } | |
715 | ||
b71d1d42 | 716 | addr6 = (const struct in6_addr*)&neigh->primary_key; |
1da177e4 LT |
717 | addr_type = ipv6_addr_type(addr6); |
718 | ||
719 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 720 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
721 | addr_type = ipv6_addr_type(addr6); |
722 | } | |
723 | ||
724 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
725 | goto tx_error_icmp; | |
726 | ||
727 | dst = addr6->s6_addr32[3]; | |
728 | } | |
729 | ||
31e4543d | 730 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
731 | dst, tiph->saddr, |
732 | 0, 0, | |
733 | IPPROTO_IPV6, RT_TOS(tos), | |
734 | tunnel->parms.link); | |
735 | if (IS_ERR(rt)) { | |
736 | dev->stats.tx_carrier_errors++; | |
737 | goto tx_error_icmp; | |
1da177e4 LT |
738 | } |
739 | if (rt->rt_type != RTN_UNICAST) { | |
740 | ip_rt_put(rt); | |
15fc1f70 | 741 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
742 | goto tx_error_icmp; |
743 | } | |
d8d1f30b | 744 | tdev = rt->dst.dev; |
1da177e4 LT |
745 | |
746 | if (tdev == dev) { | |
747 | ip_rt_put(rt); | |
15fc1f70 | 748 | dev->stats.collisions++; |
1da177e4 LT |
749 | goto tx_error; |
750 | } | |
751 | ||
292f4f3c | 752 | if (df) { |
d8d1f30b | 753 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 754 | |
292f4f3c | 755 | if (mtu < 68) { |
15fc1f70 | 756 | dev->stats.collisions++; |
292f4f3c HX |
757 | ip_rt_put(rt); |
758 | goto tx_error; | |
759 | } | |
1da177e4 | 760 | |
292f4f3c HX |
761 | if (mtu < IPV6_MIN_MTU) { |
762 | mtu = IPV6_MIN_MTU; | |
763 | df = 0; | |
764 | } | |
765 | ||
766 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
767 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
768 | ||
769 | if (skb->len > mtu) { | |
3ffe533c | 770 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
771 | ip_rt_put(rt); |
772 | goto tx_error; | |
773 | } | |
1da177e4 LT |
774 | } |
775 | ||
776 | if (tunnel->err_count > 0) { | |
bb80087a WY |
777 | if (time_before(jiffies, |
778 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
779 | tunnel->err_count--; |
780 | dst_link_failure(skb); | |
781 | } else | |
782 | tunnel->err_count = 0; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Okay, now see if we can stuff it in the buffer as-is. | |
787 | */ | |
788 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
789 | ||
cfbba49d PM |
790 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
791 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
792 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
793 | if (!new_skb) { | |
794 | ip_rt_put(rt); | |
15fc1f70 | 795 | dev->stats.tx_dropped++; |
1da177e4 | 796 | dev_kfree_skb(skb); |
6ed10654 | 797 | return NETDEV_TX_OK; |
1da177e4 LT |
798 | } |
799 | if (skb->sk) | |
800 | skb_set_owner_w(new_skb, skb->sk); | |
801 | dev_kfree_skb(skb); | |
802 | skb = new_skb; | |
0660e03f | 803 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
804 | } |
805 | ||
b0e380b1 | 806 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
807 | skb_push(skb, sizeof(struct iphdr)); |
808 | skb_reset_network_header(skb); | |
1da177e4 | 809 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 810 | IPCB(skb)->flags = 0; |
adf30907 | 811 | skb_dst_drop(skb); |
d8d1f30b | 812 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
813 | |
814 | /* | |
815 | * Push down and install the IPIP header. | |
816 | */ | |
817 | ||
eddc9ec5 | 818 | iph = ip_hdr(skb); |
1da177e4 LT |
819 | iph->version = 4; |
820 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 821 | iph->frag_off = df; |
1da177e4 LT |
822 | iph->protocol = IPPROTO_IPV6; |
823 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
301102cc DM |
824 | iph->daddr = fl4.daddr; |
825 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
826 | |
827 | if ((iph->ttl = tiph->ttl) == 0) | |
828 | iph->ttl = iph6->hop_limit; | |
829 | ||
830 | nf_reset(skb); | |
15fc1f70 ED |
831 | tstats = this_cpu_ptr(dev->tstats); |
832 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 833 | return NETDEV_TX_OK; |
1da177e4 LT |
834 | |
835 | tx_error_icmp: | |
836 | dst_link_failure(skb); | |
837 | tx_error: | |
15fc1f70 | 838 | dev->stats.tx_errors++; |
1da177e4 | 839 | dev_kfree_skb(skb); |
6ed10654 | 840 | return NETDEV_TX_OK; |
1da177e4 LT |
841 | } |
842 | ||
8a4a50f9 MS |
843 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
844 | { | |
845 | struct net_device *tdev = NULL; | |
846 | struct ip_tunnel *tunnel; | |
b71d1d42 | 847 | const struct iphdr *iph; |
31e4543d | 848 | struct flowi4 fl4; |
8a4a50f9 MS |
849 | |
850 | tunnel = netdev_priv(dev); | |
851 | iph = &tunnel->parms.iph; | |
852 | ||
853 | if (iph->daddr) { | |
31e4543d | 854 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
855 | iph->daddr, iph->saddr, |
856 | 0, 0, | |
857 | IPPROTO_IPV6, | |
858 | RT_TOS(iph->tos), | |
859 | tunnel->parms.link); | |
b23dd4fe DM |
860 | |
861 | if (!IS_ERR(rt)) { | |
d8d1f30b | 862 | tdev = rt->dst.dev; |
8a4a50f9 MS |
863 | ip_rt_put(rt); |
864 | } | |
865 | dev->flags |= IFF_POINTOPOINT; | |
866 | } | |
867 | ||
868 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 869 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
870 | |
871 | if (tdev) { | |
872 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
873 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
874 | if (dev->mtu < IPV6_MIN_MTU) | |
875 | dev->mtu = IPV6_MIN_MTU; | |
876 | } | |
877 | dev->iflink = tunnel->parms.link; | |
878 | } | |
879 | ||
1da177e4 LT |
880 | static int |
881 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
882 | { | |
883 | int err = 0; | |
884 | struct ip_tunnel_parm p; | |
fadf6bf0 | 885 | struct ip_tunnel_prl prl; |
1da177e4 | 886 | struct ip_tunnel *t; |
ca8def14 PE |
887 | struct net *net = dev_net(dev); |
888 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
889 | #ifdef CONFIG_IPV6_SIT_6RD |
890 | struct ip_tunnel_6rd ip6rd; | |
891 | #endif | |
1da177e4 LT |
892 | |
893 | switch (cmd) { | |
894 | case SIOCGETTUNNEL: | |
fa857afc YH |
895 | #ifdef CONFIG_IPV6_SIT_6RD |
896 | case SIOCGET6RD: | |
897 | #endif | |
1da177e4 | 898 | t = NULL; |
cd3dbc19 | 899 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
900 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
901 | err = -EFAULT; | |
902 | break; | |
903 | } | |
ca8def14 | 904 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
905 | } |
906 | if (t == NULL) | |
2941a486 | 907 | t = netdev_priv(dev); |
fa857afc YH |
908 | |
909 | err = -EFAULT; | |
910 | if (cmd == SIOCGETTUNNEL) { | |
911 | memcpy(&p, &t->parms, sizeof(p)); | |
912 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
913 | sizeof(p))) | |
914 | goto done; | |
915 | #ifdef CONFIG_IPV6_SIT_6RD | |
916 | } else { | |
917 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
918 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
919 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
920 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
921 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
922 | sizeof(ip6rd))) | |
923 | goto done; | |
924 | #endif | |
925 | } | |
926 | err = 0; | |
1da177e4 LT |
927 | break; |
928 | ||
929 | case SIOCADDTUNNEL: | |
930 | case SIOCCHGTUNNEL: | |
931 | err = -EPERM; | |
932 | if (!capable(CAP_NET_ADMIN)) | |
933 | goto done; | |
934 | ||
935 | err = -EFAULT; | |
936 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
937 | goto done; | |
938 | ||
939 | err = -EINVAL; | |
940 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
941 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
942 | goto done; | |
943 | if (p.iph.ttl) | |
944 | p.iph.frag_off |= htons(IP_DF); | |
945 | ||
ca8def14 | 946 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 947 | |
cd3dbc19 | 948 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
949 | if (t != NULL) { |
950 | if (t->dev != dev) { | |
951 | err = -EEXIST; | |
952 | break; | |
953 | } | |
954 | } else { | |
955 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
956 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
957 | err = -EINVAL; | |
958 | break; | |
959 | } | |
2941a486 | 960 | t = netdev_priv(dev); |
ca8def14 | 961 | ipip6_tunnel_unlink(sitn, t); |
74b0b85b | 962 | synchronize_net(); |
1da177e4 LT |
963 | t->parms.iph.saddr = p.iph.saddr; |
964 | t->parms.iph.daddr = p.iph.daddr; | |
965 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
966 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 967 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
968 | netdev_state_change(dev); |
969 | } | |
970 | } | |
971 | ||
972 | if (t) { | |
973 | err = 0; | |
974 | if (cmd == SIOCCHGTUNNEL) { | |
975 | t->parms.iph.ttl = p.iph.ttl; | |
976 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
977 | if (t->parms.link != p.link) { |
978 | t->parms.link = p.link; | |
979 | ipip6_tunnel_bind_dev(dev); | |
980 | netdev_state_change(dev); | |
981 | } | |
1da177e4 LT |
982 | } |
983 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
984 | err = -EFAULT; | |
985 | } else | |
986 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
987 | break; | |
988 | ||
989 | case SIOCDELTUNNEL: | |
990 | err = -EPERM; | |
991 | if (!capable(CAP_NET_ADMIN)) | |
992 | goto done; | |
993 | ||
cd3dbc19 | 994 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
995 | err = -EFAULT; |
996 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
997 | goto done; | |
998 | err = -ENOENT; | |
ca8def14 | 999 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1000 | goto done; |
1001 | err = -EPERM; | |
cd3dbc19 | 1002 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1003 | goto done; |
1004 | dev = t->dev; | |
1005 | } | |
22f8cde5 SH |
1006 | unregister_netdevice(dev); |
1007 | err = 0; | |
1da177e4 LT |
1008 | break; |
1009 | ||
300aaeea | 1010 | case SIOCGETPRL: |
2b4743bd YH |
1011 | err = -EINVAL; |
1012 | if (dev == sitn->fb_tunnel_dev) | |
1013 | goto done; | |
1014 | err = -ENOENT; | |
1015 | if (!(t = netdev_priv(dev))) | |
1016 | goto done; | |
1017 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1018 | break; | |
1019 | ||
fadf6bf0 TF |
1020 | case SIOCADDPRL: |
1021 | case SIOCDELPRL: | |
1022 | case SIOCCHGPRL: | |
1023 | err = -EPERM; | |
2b4743bd | 1024 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1025 | goto done; |
1026 | err = -EINVAL; | |
cd3dbc19 | 1027 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1028 | goto done; |
1029 | err = -EFAULT; | |
1030 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1031 | goto done; | |
1032 | err = -ENOENT; | |
1033 | if (!(t = netdev_priv(dev))) | |
1034 | goto done; | |
1035 | ||
300aaeea | 1036 | switch (cmd) { |
300aaeea | 1037 | case SIOCDELPRL: |
fadf6bf0 | 1038 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1039 | break; |
1040 | case SIOCADDPRL: | |
1041 | case SIOCCHGPRL: | |
fadf6bf0 | 1042 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1043 | break; |
1044 | } | |
2b4743bd | 1045 | netdev_state_change(dev); |
fadf6bf0 TF |
1046 | break; |
1047 | ||
fa857afc YH |
1048 | #ifdef CONFIG_IPV6_SIT_6RD |
1049 | case SIOCADD6RD: | |
1050 | case SIOCCHG6RD: | |
1051 | case SIOCDEL6RD: | |
1052 | err = -EPERM; | |
1053 | if (!capable(CAP_NET_ADMIN)) | |
1054 | goto done; | |
1055 | ||
1056 | err = -EFAULT; | |
1057 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1058 | sizeof(ip6rd))) | |
1059 | goto done; | |
1060 | ||
1061 | t = netdev_priv(dev); | |
1062 | ||
1063 | if (cmd != SIOCDEL6RD) { | |
1064 | struct in6_addr prefix; | |
1065 | __be32 relay_prefix; | |
1066 | ||
1067 | err = -EINVAL; | |
1068 | if (ip6rd.relay_prefixlen > 32 || | |
1069 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1070 | goto done; | |
1071 | ||
1072 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1073 | ip6rd.prefixlen); | |
1074 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1075 | goto done; | |
91b2a3f9 YH |
1076 | if (ip6rd.relay_prefixlen) |
1077 | relay_prefix = ip6rd.relay_prefix & | |
1078 | htonl(0xffffffffUL << | |
1079 | (32 - ip6rd.relay_prefixlen)); | |
1080 | else | |
1081 | relay_prefix = 0; | |
fa857afc YH |
1082 | if (relay_prefix != ip6rd.relay_prefix) |
1083 | goto done; | |
1084 | ||
1085 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1086 | t->ip6rd.relay_prefix = relay_prefix; | |
1087 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1088 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1089 | } else | |
e0c93948 | 1090 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1091 | |
1092 | err = 0; | |
1093 | break; | |
1094 | #endif | |
1095 | ||
1da177e4 LT |
1096 | default: |
1097 | err = -EINVAL; | |
1098 | } | |
1099 | ||
1100 | done: | |
1101 | return err; | |
1102 | } | |
1103 | ||
1da177e4 LT |
1104 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1105 | { | |
1106 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1107 | return -EINVAL; | |
1108 | dev->mtu = new_mtu; | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1326c3d5 SH |
1112 | static const struct net_device_ops ipip6_netdev_ops = { |
1113 | .ndo_uninit = ipip6_tunnel_uninit, | |
1114 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1115 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1116 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
15fc1f70 | 1117 | .ndo_get_stats = ipip6_get_stats, |
1326c3d5 SH |
1118 | }; |
1119 | ||
15fc1f70 ED |
1120 | static void ipip6_dev_free(struct net_device *dev) |
1121 | { | |
1122 | free_percpu(dev->tstats); | |
1123 | free_netdev(dev); | |
1124 | } | |
1125 | ||
1da177e4 LT |
1126 | static void ipip6_tunnel_setup(struct net_device *dev) |
1127 | { | |
1326c3d5 | 1128 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1129 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1130 | |
1131 | dev->type = ARPHRD_SIT; | |
1132 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1133 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1134 | dev->flags = IFF_NOARP; |
f2ba025b | 1135 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1136 | dev->iflink = 0; |
1137 | dev->addr_len = 4; | |
7a97146c | 1138 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1139 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1140 | } |
1141 | ||
15fc1f70 | 1142 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1143 | { |
1326c3d5 | 1144 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1145 | |
1146 | tunnel->dev = dev; | |
1147 | strcpy(tunnel->parms.name, dev->name); | |
1148 | ||
1149 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1150 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1151 | ||
8a4a50f9 | 1152 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1153 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1154 | if (!dev->tstats) | |
1155 | return -ENOMEM; | |
1156 | ||
1157 | return 0; | |
1da177e4 LT |
1158 | } |
1159 | ||
dd4080ee | 1160 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1161 | { |
2941a486 | 1162 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1163 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1164 | struct net *net = dev_net(dev); |
1165 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1166 | |
1167 | tunnel->dev = dev; | |
1168 | strcpy(tunnel->parms.name, dev->name); | |
1169 | ||
1170 | iph->version = 4; | |
1171 | iph->protocol = IPPROTO_IPV6; | |
1172 | iph->ihl = 5; | |
1173 | iph->ttl = 64; | |
1174 | ||
dd4080ee ED |
1175 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1176 | if (!dev->tstats) | |
1177 | return -ENOMEM; | |
1da177e4 | 1178 | dev_hold(dev); |
a9b3cd7f | 1179 | RCU_INIT_POINTER(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1180 | return 0; |
1da177e4 LT |
1181 | } |
1182 | ||
6dcd814b | 1183 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1184 | .handler = ipip6_rcv, |
1185 | .err_handler = ipip6_err, | |
c73cb5a2 | 1186 | .priority = 1, |
1da177e4 LT |
1187 | }; |
1188 | ||
2c8c1e72 | 1189 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1190 | { |
1191 | int prio; | |
1192 | ||
1193 | for (prio = 1; prio < 4; prio++) { | |
1194 | int h; | |
1195 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1196 | struct ip_tunnel *t; |
62808f91 | 1197 | |
753ea8e9 | 1198 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1199 | while (t != NULL) { |
1200 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1201 | t = rtnl_dereference(t->next); |
62808f91 | 1202 | } |
db44575f AK |
1203 | } |
1204 | } | |
1205 | } | |
1206 | ||
2c8c1e72 | 1207 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1208 | { |
67101172 | 1209 | struct sit_net *sitn = net_generic(net, sit_net_id); |
8190d900 | 1210 | int err; |
8190d900 | 1211 | |
29182176 PE |
1212 | sitn->tunnels[0] = sitn->tunnels_wc; |
1213 | sitn->tunnels[1] = sitn->tunnels_l; | |
1214 | sitn->tunnels[2] = sitn->tunnels_r; | |
1215 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1216 | ||
cd3dbc19 PE |
1217 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1218 | ipip6_tunnel_setup); | |
1219 | if (!sitn->fb_tunnel_dev) { | |
1220 | err = -ENOMEM; | |
1221 | goto err_alloc_dev; | |
1222 | } | |
be77e593 | 1223 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1224 | |
dd4080ee ED |
1225 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1226 | if (err) | |
1227 | goto err_dev_free; | |
1228 | ||
e0c93948 | 1229 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1230 | |
1231 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1232 | goto err_reg_dev; | |
1233 | ||
8190d900 PE |
1234 | return 0; |
1235 | ||
cd3dbc19 | 1236 | err_reg_dev: |
1326c3d5 | 1237 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1238 | err_dev_free: |
1239 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1240 | err_alloc_dev: |
8190d900 PE |
1241 | return err; |
1242 | } | |
1243 | ||
2c8c1e72 | 1244 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1245 | { |
67101172 | 1246 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1247 | LIST_HEAD(list); |
8190d900 | 1248 | |
cd3dbc19 | 1249 | rtnl_lock(); |
62808f91 ED |
1250 | sit_destroy_tunnels(sitn, &list); |
1251 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1252 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1253 | rtnl_unlock(); |
8190d900 PE |
1254 | } |
1255 | ||
1256 | static struct pernet_operations sit_net_ops = { | |
1257 | .init = sit_init_net, | |
1258 | .exit = sit_exit_net, | |
67101172 EB |
1259 | .id = &sit_net_id, |
1260 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1261 | }; |
1262 | ||
89c89458 | 1263 | static void __exit sit_cleanup(void) |
1da177e4 | 1264 | { |
c73cb5a2 | 1265 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1266 | |
67101172 | 1267 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1268 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1269 | } |
1270 | ||
89c89458 | 1271 | static int __init sit_init(void) |
1da177e4 LT |
1272 | { |
1273 | int err; | |
1274 | ||
1275 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1276 | ||
67101172 | 1277 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1278 | if (err < 0) |
d5aa407f AD |
1279 | return err; |
1280 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1281 | if (err < 0) { | |
1282 | unregister_pernet_device(&sit_net_ops); | |
1283 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
1284 | } | |
1da177e4 | 1285 | return err; |
1da177e4 | 1286 | } |
989e5b96 JR |
1287 | |
1288 | module_init(sit_init); | |
1289 | module_exit(sit_cleanup); | |
39c85086 | 1290 | MODULE_LICENSE("GPL"); |
8909c9ad | 1291 | MODULE_ALIAS_NETDEV("sit0"); |