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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 | ||
f3213831 JP |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include <linux/init.h> | |
36 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 37 | #include <linux/if_ether.h> |
1da177e4 LT |
38 | |
39 | #include <net/sock.h> | |
40 | #include <net/snmp.h> | |
41 | ||
42 | #include <net/ipv6.h> | |
43 | #include <net/protocol.h> | |
44 | #include <net/transp_v6.h> | |
45 | #include <net/ip6_fib.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <net/ndisc.h> | |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip.h> | |
50 | #include <net/udp.h> | |
51 | #include <net/icmp.h> | |
52 | #include <net/ipip.h> | |
53 | #include <net/inet_ecn.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
8190d900 PE |
56 | #include <net/net_namespace.h> |
57 | #include <net/netns/generic.h> | |
1da177e4 LT |
58 | |
59 | /* | |
60 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
61 | ||
62 | For comments look at net/ipv4/ip_gre.c --ANK | |
63 | */ | |
64 | ||
65 | #define HASH_SIZE 16 | |
e69a4adc | 66 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 67 | |
15fc1f70 | 68 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 69 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 70 | static void ipip6_dev_free(struct net_device *dev); |
ba3e3f50 | 71 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 72 | |
f99189b1 | 73 | static int sit_net_id __read_mostly; |
8190d900 | 74 | struct sit_net { |
3a43be3c ED |
75 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
76 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
77 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
78 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
79 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 80 | |
cd3dbc19 | 81 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
82 | }; |
83 | ||
87b6d218 | 84 | static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, |
85 | struct rtnl_link_stats64 *tot) | |
15fc1f70 | 86 | { |
15fc1f70 ED |
87 | int i; |
88 | ||
89 | for_each_possible_cpu(i) { | |
90 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 91 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
92 | unsigned int start; | |
93 | ||
94 | do { | |
95 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
96 | rx_packets = tstats->rx_packets; | |
97 | tx_packets = tstats->tx_packets; | |
98 | rx_bytes = tstats->rx_bytes; | |
99 | tx_bytes = tstats->tx_bytes; | |
100 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
101 | ||
102 | tot->rx_packets += rx_packets; | |
103 | tot->tx_packets += tx_packets; | |
104 | tot->rx_bytes += rx_bytes; | |
105 | tot->tx_bytes += tx_bytes; | |
15fc1f70 | 106 | } |
87b6d218 | 107 | |
108 | tot->rx_errors = dev->stats.rx_errors; | |
109 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
110 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
111 | tot->tx_dropped = dev->stats.tx_dropped; | |
112 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
113 | tot->tx_errors = dev->stats.tx_errors; | |
114 | ||
115 | return tot; | |
15fc1f70 | 116 | } |
87b6d218 | 117 | |
4543c10d ED |
118 | /* |
119 | * Must be invoked with rcu_read_lock | |
120 | */ | |
3e866703 | 121 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 122 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 123 | { |
3a43be3c ED |
124 | unsigned int h0 = HASH(remote); |
125 | unsigned int h1 = HASH(local); | |
1da177e4 | 126 | struct ip_tunnel *t; |
29182176 | 127 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 128 | |
e086cadc | 129 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 130 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
131 | remote == t->parms.iph.daddr && |
132 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
133 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
134 | return t; |
135 | } | |
e086cadc | 136 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d SH |
137 | if (remote == t->parms.iph.daddr && |
138 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
139 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
140 | return t; |
141 | } | |
e086cadc | 142 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d SH |
143 | if (local == t->parms.iph.saddr && |
144 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
145 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
146 | return t; |
147 | } | |
4543c10d | 148 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 149 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
150 | return t; |
151 | return NULL; | |
152 | } | |
153 | ||
3a43be3c | 154 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 155 | struct ip_tunnel_parm *parms) |
1da177e4 | 156 | { |
420fe234 YH |
157 | __be32 remote = parms->iph.daddr; |
158 | __be32 local = parms->iph.saddr; | |
3a43be3c | 159 | unsigned int h = 0; |
1da177e4 LT |
160 | int prio = 0; |
161 | ||
162 | if (remote) { | |
163 | prio |= 2; | |
164 | h ^= HASH(remote); | |
165 | } | |
166 | if (local) { | |
167 | prio |= 1; | |
168 | h ^= HASH(local); | |
169 | } | |
29182176 | 170 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
171 | } |
172 | ||
3a43be3c | 173 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 174 | struct ip_tunnel *t) |
420fe234 | 175 | { |
ca8def14 | 176 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
177 | } |
178 | ||
ca8def14 | 179 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 180 | { |
3a43be3c ED |
181 | struct ip_tunnel __rcu **tp; |
182 | struct ip_tunnel *iter; | |
183 | ||
184 | for (tp = ipip6_bucket(sitn, t); | |
185 | (iter = rtnl_dereference(*tp)) != NULL; | |
186 | tp = &iter->next) { | |
187 | if (t == iter) { | |
cf778b00 | 188 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
189 | break; |
190 | } | |
191 | } | |
192 | } | |
193 | ||
ca8def14 | 194 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 195 | { |
3a43be3c | 196 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 197 | |
cf778b00 ED |
198 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
199 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
200 | } |
201 | ||
e0c93948 | 202 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
203 | { |
204 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
205 | struct ip_tunnel *t = netdev_priv(dev); |
206 | ||
fa857afc YH |
207 | if (t->dev == sitn->fb_tunnel_dev) { |
208 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
209 | t->ip6rd.relay_prefix = 0; | |
210 | t->ip6rd.prefixlen = 16; | |
211 | t->ip6rd.relay_prefixlen = 0; | |
212 | } else { | |
213 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
214 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
215 | } | |
216 | #endif | |
217 | } | |
218 | ||
f3723416 ND |
219 | static int ipip6_tunnel_create(struct net_device *dev) |
220 | { | |
221 | struct ip_tunnel *t = netdev_priv(dev); | |
222 | struct net *net = dev_net(dev); | |
223 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
224 | int err; | |
225 | ||
226 | err = ipip6_tunnel_init(dev); | |
227 | if (err < 0) | |
228 | goto out; | |
229 | ipip6_tunnel_clone_6rd(dev, sitn); | |
230 | ||
231 | if (t->parms.i_flags & SIT_ISATAP) | |
232 | dev->priv_flags |= IFF_ISATAP; | |
233 | ||
234 | err = register_netdevice(dev); | |
235 | if (err < 0) | |
236 | goto out; | |
237 | ||
238 | strcpy(t->parms.name, dev->name); | |
239 | dev->rtnl_link_ops = &sit_link_ops; | |
240 | ||
241 | dev_hold(dev); | |
242 | ||
243 | ipip6_tunnel_link(sitn, t); | |
244 | return 0; | |
245 | ||
246 | out: | |
247 | return err; | |
248 | } | |
249 | ||
3a43be3c | 250 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 251 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 252 | { |
e69a4adc AV |
253 | __be32 remote = parms->iph.daddr; |
254 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
255 | struct ip_tunnel *t, *nt; |
256 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 257 | struct net_device *dev; |
1da177e4 | 258 | char name[IFNAMSIZ]; |
ca8def14 | 259 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 260 | |
3a43be3c ED |
261 | for (tp = __ipip6_bucket(sitn, parms); |
262 | (t = rtnl_dereference(*tp)) != NULL; | |
263 | tp = &t->next) { | |
8db99e57 | 264 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
265 | remote == t->parms.iph.daddr && |
266 | parms->link == t->parms.link) { | |
8db99e57 SH |
267 | if (create) |
268 | return NULL; | |
269 | else | |
270 | return t; | |
271 | } | |
1da177e4 LT |
272 | } |
273 | if (!create) | |
274 | goto failed; | |
275 | ||
276 | if (parms->name[0]) | |
277 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 278 | else |
15fc1f70 | 279 | strcpy(name, "sit%d"); |
1da177e4 LT |
280 | |
281 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
282 | if (dev == NULL) | |
283 | return NULL; | |
284 | ||
7a97146c PE |
285 | dev_net_set(dev, net); |
286 | ||
2941a486 | 287 | nt = netdev_priv(dev); |
1326c3d5 | 288 | |
1da177e4 | 289 | nt->parms = *parms; |
f3723416 | 290 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 291 | goto failed_free; |
1da177e4 | 292 | |
1da177e4 LT |
293 | return nt; |
294 | ||
b37d428b | 295 | failed_free: |
15fc1f70 | 296 | ipip6_dev_free(dev); |
1da177e4 LT |
297 | failed: |
298 | return NULL; | |
299 | } | |
300 | ||
ef9a9d11 ED |
301 | #define for_each_prl_rcu(start) \ |
302 | for (prl = rcu_dereference(start); \ | |
303 | prl; \ | |
304 | prl = rcu_dereference(prl->next)) | |
305 | ||
fadf6bf0 | 306 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 307 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 308 | { |
ef9a9d11 | 309 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 310 | |
ef9a9d11 ED |
311 | for_each_prl_rcu(t->prl) |
312 | if (prl->addr == addr) | |
fadf6bf0 | 313 | break; |
ef9a9d11 | 314 | return prl; |
fadf6bf0 TF |
315 | |
316 | } | |
317 | ||
2b4743bd YH |
318 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
319 | struct ip_tunnel_prl __user *a) | |
300aaeea | 320 | { |
2b4743bd | 321 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
322 | struct ip_tunnel_prl_entry *prl; |
323 | unsigned int cmax, c = 0, ca, len; | |
324 | int ret = 0; | |
325 | ||
2b4743bd YH |
326 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
327 | return -EFAULT; | |
328 | cmax = kprl.datalen / sizeof(kprl); | |
329 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
330 | cmax = 1; |
331 | ||
332 | /* For simple GET or for root users, | |
333 | * we try harder to allocate. | |
334 | */ | |
335 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
336 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
337 | NULL; | |
338 | ||
ef9a9d11 | 339 | rcu_read_lock(); |
300aaeea YH |
340 | |
341 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
342 | ||
343 | if (!kp) { | |
344 | /* We don't try hard to allocate much memory for | |
345 | * non-root users. | |
346 | * For root users, retry allocating enough memory for | |
347 | * the answer. | |
348 | */ | |
349 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
350 | if (!kp) { | |
351 | ret = -ENOMEM; | |
352 | goto out; | |
353 | } | |
354 | } | |
355 | ||
356 | c = 0; | |
ef9a9d11 | 357 | for_each_prl_rcu(t->prl) { |
298bf12d | 358 | if (c >= cmax) |
300aaeea | 359 | break; |
2b4743bd | 360 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
361 | continue; |
362 | kp[c].addr = prl->addr; | |
363 | kp[c].flags = prl->flags; | |
364 | c++; | |
2b4743bd | 365 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
366 | break; |
367 | } | |
368 | out: | |
ef9a9d11 | 369 | rcu_read_unlock(); |
300aaeea YH |
370 | |
371 | len = sizeof(*kp) * c; | |
2b4743bd YH |
372 | ret = 0; |
373 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
374 | ret = -EFAULT; | |
300aaeea YH |
375 | |
376 | kfree(kp); | |
300aaeea | 377 | |
2b4743bd | 378 | return ret; |
300aaeea YH |
379 | } |
380 | ||
fadf6bf0 TF |
381 | static int |
382 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
383 | { | |
384 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
385 | int err = 0; |
386 | ||
0009ae1f YH |
387 | if (a->addr == htonl(INADDR_ANY)) |
388 | return -EINVAL; | |
389 | ||
aac4dddc | 390 | ASSERT_RTNL(); |
fadf6bf0 | 391 | |
3a43be3c | 392 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 393 | if (p->addr == a->addr) { |
ef9a9d11 ED |
394 | if (chg) { |
395 | p->flags = a->flags; | |
396 | goto out; | |
397 | } | |
3fcfa129 YH |
398 | err = -EEXIST; |
399 | goto out; | |
fadf6bf0 TF |
400 | } |
401 | } | |
402 | ||
3fcfa129 YH |
403 | if (chg) { |
404 | err = -ENXIO; | |
405 | goto out; | |
406 | } | |
fadf6bf0 TF |
407 | |
408 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
409 | if (!p) { |
410 | err = -ENOBUFS; | |
411 | goto out; | |
412 | } | |
fadf6bf0 | 413 | |
fadf6bf0 | 414 | p->next = t->prl; |
300aaeea YH |
415 | p->addr = a->addr; |
416 | p->flags = a->flags; | |
ef9a9d11 | 417 | t->prl_count++; |
cf778b00 | 418 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 419 | out: |
3fcfa129 | 420 | return err; |
fadf6bf0 TF |
421 | } |
422 | ||
ef9a9d11 ED |
423 | static void prl_list_destroy_rcu(struct rcu_head *head) |
424 | { | |
425 | struct ip_tunnel_prl_entry *p, *n; | |
426 | ||
427 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
428 | do { | |
753ea8e9 | 429 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
430 | kfree(p); |
431 | p = n; | |
432 | } while (p); | |
433 | } | |
434 | ||
fadf6bf0 TF |
435 | static int |
436 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
437 | { | |
753ea8e9 ED |
438 | struct ip_tunnel_prl_entry *x; |
439 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
440 | int err = 0; |
441 | ||
aac4dddc | 442 | ASSERT_RTNL(); |
fadf6bf0 | 443 | |
0009ae1f | 444 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
445 | for (p = &t->prl; |
446 | (x = rtnl_dereference(*p)) != NULL; | |
447 | p = &x->next) { | |
448 | if (x->addr == a->addr) { | |
fadf6bf0 | 449 | *p = x->next; |
11c476f3 | 450 | kfree_rcu(x, rcu_head); |
300aaeea | 451 | t->prl_count--; |
3fcfa129 | 452 | goto out; |
fadf6bf0 TF |
453 | } |
454 | } | |
3fcfa129 | 455 | err = -ENXIO; |
fadf6bf0 | 456 | } else { |
753ea8e9 ED |
457 | x = rtnl_dereference(t->prl); |
458 | if (x) { | |
ef9a9d11 | 459 | t->prl_count = 0; |
ef9a9d11 ED |
460 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
461 | t->prl = NULL; | |
fadf6bf0 TF |
462 | } |
463 | } | |
3fcfa129 | 464 | out: |
4b279601 | 465 | return err; |
fadf6bf0 TF |
466 | } |
467 | ||
fadf6bf0 | 468 | static int |
b71d1d42 | 469 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 470 | { |
3fcfa129 | 471 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
472 | int ok = 1; |
473 | ||
ef9a9d11 | 474 | rcu_read_lock(); |
3fcfa129 | 475 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 476 | if (p) { |
300aaeea | 477 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
478 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
479 | else | |
480 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
481 | } else { | |
b71d1d42 ED |
482 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
483 | ||
fadf6bf0 TF |
484 | if (ipv6_addr_is_isatap(addr6) && |
485 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 486 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
487 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
488 | else | |
489 | ok = 0; | |
490 | } | |
ef9a9d11 | 491 | rcu_read_unlock(); |
fadf6bf0 TF |
492 | return ok; |
493 | } | |
494 | ||
1da177e4 LT |
495 | static void ipip6_tunnel_uninit(struct net_device *dev) |
496 | { | |
ca8def14 PE |
497 | struct net *net = dev_net(dev); |
498 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
499 | ||
cd3dbc19 | 500 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 501 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 502 | } else { |
ca8def14 | 503 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 504 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 505 | } |
3a43be3c | 506 | dev_put(dev); |
1da177e4 LT |
507 | } |
508 | ||
509 | ||
c73cb5a2 | 510 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 511 | { |
1da177e4 | 512 | |
071f92d0 | 513 | /* All the routers (except for Linux) return only |
1da177e4 LT |
514 | 8 bytes of packet payload. It means, that precise relaying of |
515 | ICMP in the real Internet is absolutely infeasible. | |
516 | */ | |
b71d1d42 | 517 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
518 | const int type = icmp_hdr(skb)->type; |
519 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 520 | struct ip_tunnel *t; |
c73cb5a2 | 521 | int err; |
1da177e4 LT |
522 | |
523 | switch (type) { | |
524 | default: | |
525 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 526 | return 0; |
1da177e4 LT |
527 | |
528 | case ICMP_DEST_UNREACH: | |
529 | switch (code) { | |
530 | case ICMP_SR_FAILED: | |
531 | case ICMP_PORT_UNREACH: | |
532 | /* Impossible event. */ | |
c73cb5a2 | 533 | return 0; |
1da177e4 LT |
534 | default: |
535 | /* All others are translated to HOST_UNREACH. | |
536 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
537 | I believe they are just ether pollution. --ANK | |
538 | */ | |
539 | break; | |
540 | } | |
541 | break; | |
542 | case ICMP_TIME_EXCEEDED: | |
543 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 544 | return 0; |
1da177e4 | 545 | break; |
ec18d9a2 DM |
546 | case ICMP_REDIRECT: |
547 | break; | |
1da177e4 LT |
548 | } |
549 | ||
c73cb5a2 KM |
550 | err = -ENOENT; |
551 | ||
4fddbf5d SH |
552 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
553 | skb->dev, | |
554 | iph->daddr, | |
555 | iph->saddr); | |
36393395 DM |
556 | if (t == NULL) |
557 | goto out; | |
558 | ||
559 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
560 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
561 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
562 | err = 0; | |
563 | goto out; | |
564 | } | |
ec18d9a2 DM |
565 | if (type == ICMP_REDIRECT) { |
566 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
567 | IPPROTO_IPV6, 0); | |
568 | err = 0; | |
569 | goto out; | |
570 | } | |
36393395 DM |
571 | |
572 | if (t->parms.iph.daddr == 0) | |
1da177e4 | 573 | goto out; |
c73cb5a2 KM |
574 | |
575 | err = 0; | |
1da177e4 LT |
576 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
577 | goto out; | |
578 | ||
bb80087a | 579 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
580 | t->err_count++; |
581 | else | |
582 | t->err_count = 1; | |
583 | t->err_time = jiffies; | |
584 | out: | |
c73cb5a2 | 585 | return err; |
1da177e4 LT |
586 | } |
587 | ||
b71d1d42 | 588 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
589 | { |
590 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 591 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
592 | } |
593 | ||
594 | static int ipip6_rcv(struct sk_buff *skb) | |
595 | { | |
b71d1d42 | 596 | const struct iphdr *iph; |
1da177e4 LT |
597 | struct ip_tunnel *tunnel; |
598 | ||
599 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
600 | goto out; | |
601 | ||
eddc9ec5 | 602 | iph = ip_hdr(skb); |
1da177e4 | 603 | |
4fddbf5d SH |
604 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
605 | iph->saddr, iph->daddr); | |
606 | if (tunnel != NULL) { | |
15fc1f70 ED |
607 | struct pcpu_tstats *tstats; |
608 | ||
1da177e4 | 609 | secpath_reset(skb); |
b0e380b1 | 610 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 611 | skb_reset_network_header(skb); |
8cdfab8a | 612 | IPCB(skb)->flags = 0; |
1da177e4 LT |
613 | skb->protocol = htons(ETH_P_IPV6); |
614 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
615 | |
616 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 617 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 618 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
619 | kfree_skb(skb); |
620 | return 0; | |
621 | } | |
d19d56dd | 622 | |
15fc1f70 ED |
623 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
624 | tstats->rx_packets++; | |
625 | tstats->rx_bytes += skb->len; | |
626 | ||
627 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 628 | |
1da177e4 | 629 | ipip6_ecn_decapsulate(iph, skb); |
8990f468 | 630 | |
caf586e5 | 631 | netif_rx(skb); |
8990f468 | 632 | |
1da177e4 LT |
633 | return 0; |
634 | } | |
635 | ||
6dcdd1b3 | 636 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 637 | return 1; |
1da177e4 | 638 | out: |
36ca34cc | 639 | kfree_skb(skb); |
1da177e4 LT |
640 | return 0; |
641 | } | |
642 | ||
fa857afc YH |
643 | /* |
644 | * Returns the embedded IPv4 address if the IPv6 address | |
645 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
646 | */ | |
647 | static inline | |
b71d1d42 | 648 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) |
1da177e4 | 649 | { |
e69a4adc | 650 | __be32 dst = 0; |
1da177e4 | 651 | |
fa857afc YH |
652 | #ifdef CONFIG_IPV6_SIT_6RD |
653 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
654 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 655 | unsigned int pbw0, pbi0; |
fa857afc YH |
656 | int pbi1; |
657 | u32 d; | |
658 | ||
659 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
660 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
661 | ||
e7db38c3 | 662 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
663 | tunnel->ip6rd.relay_prefixlen; |
664 | ||
665 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
666 | if (pbi1 > 0) | |
e7db38c3 | 667 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
668 | (32 - pbi1); |
669 | ||
670 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
671 | } | |
672 | #else | |
1da177e4 | 673 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 674 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
675 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
676 | } | |
fa857afc | 677 | #endif |
1da177e4 LT |
678 | return dst; |
679 | } | |
680 | ||
681 | /* | |
682 | * This function assumes it is being called from dev_queue_xmit() | |
683 | * and that skb is filled properly by that function. | |
684 | */ | |
685 | ||
6fef4c0c SH |
686 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
687 | struct net_device *dev) | |
1da177e4 | 688 | { |
2941a486 | 689 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
690 | const struct iphdr *tiph = &tunnel->parms.iph; |
691 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 692 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 693 | __be16 df = tiph->frag_off; |
1da177e4 | 694 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 695 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 696 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 697 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 698 | __be32 dst = tiph->daddr; |
31e4543d | 699 | struct flowi4 fl4; |
1da177e4 | 700 | int mtu; |
b71d1d42 | 701 | const struct in6_addr *addr6; |
1da177e4 LT |
702 | int addr_type; |
703 | ||
1da177e4 LT |
704 | if (skb->protocol != htons(ETH_P_IPV6)) |
705 | goto tx_error; | |
706 | ||
c2bceb3d LEM |
707 | if (tos == 1) |
708 | tos = ipv6_get_dsfield(iph6); | |
709 | ||
c7dc89c0 FT |
710 | /* ISATAP (RFC4214) - must come before 6to4 */ |
711 | if (dev->priv_flags & IFF_ISATAP) { | |
712 | struct neighbour *neigh = NULL; | |
1e2927b0 | 713 | bool do_tx_error = false; |
c7dc89c0 | 714 | |
adf30907 | 715 | if (skb_dst(skb)) |
1e2927b0 | 716 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
717 | |
718 | if (neigh == NULL) { | |
e87cc472 | 719 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
c7dc89c0 FT |
720 | goto tx_error; |
721 | } | |
722 | ||
3e866703 | 723 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
724 | addr_type = ipv6_addr_type(addr6); |
725 | ||
726 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
727 | ipv6_addr_is_isatap(addr6)) | |
728 | dst = addr6->s6_addr32[3]; | |
729 | else | |
1e2927b0 DM |
730 | do_tx_error = true; |
731 | ||
732 | neigh_release(neigh); | |
733 | if (do_tx_error) | |
c7dc89c0 FT |
734 | goto tx_error; |
735 | } | |
736 | ||
1da177e4 | 737 | if (!dst) |
fa857afc | 738 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
739 | |
740 | if (!dst) { | |
741 | struct neighbour *neigh = NULL; | |
1e2927b0 | 742 | bool do_tx_error = false; |
1da177e4 | 743 | |
adf30907 | 744 | if (skb_dst(skb)) |
1e2927b0 | 745 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
746 | |
747 | if (neigh == NULL) { | |
e87cc472 | 748 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
1da177e4 LT |
749 | goto tx_error; |
750 | } | |
751 | ||
3e866703 | 752 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
753 | addr_type = ipv6_addr_type(addr6); |
754 | ||
755 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 756 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
757 | addr_type = ipv6_addr_type(addr6); |
758 | } | |
759 | ||
1e2927b0 DM |
760 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
761 | dst = addr6->s6_addr32[3]; | |
762 | else | |
763 | do_tx_error = true; | |
1da177e4 | 764 | |
1e2927b0 DM |
765 | neigh_release(neigh); |
766 | if (do_tx_error) | |
767 | goto tx_error; | |
1da177e4 LT |
768 | } |
769 | ||
31e4543d | 770 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
771 | dst, tiph->saddr, |
772 | 0, 0, | |
773 | IPPROTO_IPV6, RT_TOS(tos), | |
774 | tunnel->parms.link); | |
775 | if (IS_ERR(rt)) { | |
776 | dev->stats.tx_carrier_errors++; | |
777 | goto tx_error_icmp; | |
1da177e4 LT |
778 | } |
779 | if (rt->rt_type != RTN_UNICAST) { | |
780 | ip_rt_put(rt); | |
15fc1f70 | 781 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
782 | goto tx_error_icmp; |
783 | } | |
d8d1f30b | 784 | tdev = rt->dst.dev; |
1da177e4 LT |
785 | |
786 | if (tdev == dev) { | |
787 | ip_rt_put(rt); | |
15fc1f70 | 788 | dev->stats.collisions++; |
1da177e4 LT |
789 | goto tx_error; |
790 | } | |
791 | ||
292f4f3c | 792 | if (df) { |
d8d1f30b | 793 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 794 | |
292f4f3c | 795 | if (mtu < 68) { |
15fc1f70 | 796 | dev->stats.collisions++; |
292f4f3c HX |
797 | ip_rt_put(rt); |
798 | goto tx_error; | |
799 | } | |
1da177e4 | 800 | |
292f4f3c HX |
801 | if (mtu < IPV6_MIN_MTU) { |
802 | mtu = IPV6_MIN_MTU; | |
803 | df = 0; | |
804 | } | |
805 | ||
806 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 807 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c HX |
808 | |
809 | if (skb->len > mtu) { | |
3ffe533c | 810 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
811 | ip_rt_put(rt); |
812 | goto tx_error; | |
813 | } | |
1da177e4 LT |
814 | } |
815 | ||
816 | if (tunnel->err_count > 0) { | |
bb80087a WY |
817 | if (time_before(jiffies, |
818 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
819 | tunnel->err_count--; |
820 | dst_link_failure(skb); | |
821 | } else | |
822 | tunnel->err_count = 0; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Okay, now see if we can stuff it in the buffer as-is. | |
827 | */ | |
828 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
829 | ||
cfbba49d PM |
830 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
831 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
832 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
833 | if (!new_skb) { | |
834 | ip_rt_put(rt); | |
15fc1f70 | 835 | dev->stats.tx_dropped++; |
1da177e4 | 836 | dev_kfree_skb(skb); |
6ed10654 | 837 | return NETDEV_TX_OK; |
1da177e4 LT |
838 | } |
839 | if (skb->sk) | |
840 | skb_set_owner_w(new_skb, skb->sk); | |
841 | dev_kfree_skb(skb); | |
842 | skb = new_skb; | |
0660e03f | 843 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
844 | } |
845 | ||
b0e380b1 | 846 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
847 | skb_push(skb, sizeof(struct iphdr)); |
848 | skb_reset_network_header(skb); | |
1da177e4 | 849 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 850 | IPCB(skb)->flags = 0; |
adf30907 | 851 | skb_dst_drop(skb); |
d8d1f30b | 852 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
853 | |
854 | /* | |
855 | * Push down and install the IPIP header. | |
856 | */ | |
857 | ||
eddc9ec5 | 858 | iph = ip_hdr(skb); |
1da177e4 LT |
859 | iph->version = 4; |
860 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 861 | iph->frag_off = df; |
1da177e4 LT |
862 | iph->protocol = IPPROTO_IPV6; |
863 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
301102cc DM |
864 | iph->daddr = fl4.daddr; |
865 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
866 | |
867 | if ((iph->ttl = tiph->ttl) == 0) | |
868 | iph->ttl = iph6->hop_limit; | |
869 | ||
aa0010f8 | 870 | iptunnel_xmit(skb, dev); |
6ed10654 | 871 | return NETDEV_TX_OK; |
1da177e4 LT |
872 | |
873 | tx_error_icmp: | |
874 | dst_link_failure(skb); | |
875 | tx_error: | |
15fc1f70 | 876 | dev->stats.tx_errors++; |
1da177e4 | 877 | dev_kfree_skb(skb); |
6ed10654 | 878 | return NETDEV_TX_OK; |
1da177e4 LT |
879 | } |
880 | ||
8a4a50f9 MS |
881 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
882 | { | |
883 | struct net_device *tdev = NULL; | |
884 | struct ip_tunnel *tunnel; | |
b71d1d42 | 885 | const struct iphdr *iph; |
31e4543d | 886 | struct flowi4 fl4; |
8a4a50f9 MS |
887 | |
888 | tunnel = netdev_priv(dev); | |
889 | iph = &tunnel->parms.iph; | |
890 | ||
891 | if (iph->daddr) { | |
31e4543d | 892 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
893 | iph->daddr, iph->saddr, |
894 | 0, 0, | |
895 | IPPROTO_IPV6, | |
896 | RT_TOS(iph->tos), | |
897 | tunnel->parms.link); | |
b23dd4fe DM |
898 | |
899 | if (!IS_ERR(rt)) { | |
d8d1f30b | 900 | tdev = rt->dst.dev; |
8a4a50f9 MS |
901 | ip_rt_put(rt); |
902 | } | |
903 | dev->flags |= IFF_POINTOPOINT; | |
904 | } | |
905 | ||
906 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 907 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
908 | |
909 | if (tdev) { | |
910 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
911 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
912 | if (dev->mtu < IPV6_MIN_MTU) | |
913 | dev->mtu = IPV6_MIN_MTU; | |
914 | } | |
915 | dev->iflink = tunnel->parms.link; | |
916 | } | |
917 | ||
f3723416 ND |
918 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) |
919 | { | |
920 | struct net *net = dev_net(t->dev); | |
921 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
922 | ||
923 | ipip6_tunnel_unlink(sitn, t); | |
924 | synchronize_net(); | |
925 | t->parms.iph.saddr = p->iph.saddr; | |
926 | t->parms.iph.daddr = p->iph.daddr; | |
927 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
928 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
929 | ipip6_tunnel_link(sitn, t); | |
930 | t->parms.iph.ttl = p->iph.ttl; | |
931 | t->parms.iph.tos = p->iph.tos; | |
932 | if (t->parms.link != p->link) { | |
933 | t->parms.link = p->link; | |
934 | ipip6_tunnel_bind_dev(t->dev); | |
935 | } | |
936 | netdev_state_change(t->dev); | |
937 | } | |
938 | ||
1da177e4 LT |
939 | static int |
940 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
941 | { | |
942 | int err = 0; | |
943 | struct ip_tunnel_parm p; | |
fadf6bf0 | 944 | struct ip_tunnel_prl prl; |
1da177e4 | 945 | struct ip_tunnel *t; |
ca8def14 PE |
946 | struct net *net = dev_net(dev); |
947 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
948 | #ifdef CONFIG_IPV6_SIT_6RD |
949 | struct ip_tunnel_6rd ip6rd; | |
950 | #endif | |
1da177e4 LT |
951 | |
952 | switch (cmd) { | |
953 | case SIOCGETTUNNEL: | |
fa857afc YH |
954 | #ifdef CONFIG_IPV6_SIT_6RD |
955 | case SIOCGET6RD: | |
956 | #endif | |
1da177e4 | 957 | t = NULL; |
cd3dbc19 | 958 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
959 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
960 | err = -EFAULT; | |
961 | break; | |
962 | } | |
ca8def14 | 963 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
964 | } |
965 | if (t == NULL) | |
2941a486 | 966 | t = netdev_priv(dev); |
fa857afc YH |
967 | |
968 | err = -EFAULT; | |
969 | if (cmd == SIOCGETTUNNEL) { | |
970 | memcpy(&p, &t->parms, sizeof(p)); | |
971 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
972 | sizeof(p))) | |
973 | goto done; | |
974 | #ifdef CONFIG_IPV6_SIT_6RD | |
975 | } else { | |
4e3fd7a0 | 976 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
977 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
978 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
979 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
980 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
981 | sizeof(ip6rd))) | |
982 | goto done; | |
983 | #endif | |
984 | } | |
985 | err = 0; | |
1da177e4 LT |
986 | break; |
987 | ||
988 | case SIOCADDTUNNEL: | |
989 | case SIOCCHGTUNNEL: | |
990 | err = -EPERM; | |
991 | if (!capable(CAP_NET_ADMIN)) | |
992 | goto done; | |
993 | ||
994 | err = -EFAULT; | |
995 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
996 | goto done; | |
997 | ||
998 | err = -EINVAL; | |
999 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
1000 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
1001 | goto done; | |
1002 | if (p.iph.ttl) | |
1003 | p.iph.frag_off |= htons(IP_DF); | |
1004 | ||
ca8def14 | 1005 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1006 | |
cd3dbc19 | 1007 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1008 | if (t != NULL) { |
1009 | if (t->dev != dev) { | |
1010 | err = -EEXIST; | |
1011 | break; | |
1012 | } | |
1013 | } else { | |
1014 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1015 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1016 | err = -EINVAL; | |
1017 | break; | |
1018 | } | |
2941a486 | 1019 | t = netdev_priv(dev); |
1da177e4 | 1020 | } |
f9cd5a55 | 1021 | |
f3723416 | 1022 | ipip6_tunnel_update(t, &p); |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | if (t) { | |
1026 | err = 0; | |
1da177e4 LT |
1027 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1028 | err = -EFAULT; | |
1029 | } else | |
1030 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1031 | break; | |
1032 | ||
1033 | case SIOCDELTUNNEL: | |
1034 | err = -EPERM; | |
1035 | if (!capable(CAP_NET_ADMIN)) | |
1036 | goto done; | |
1037 | ||
cd3dbc19 | 1038 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1039 | err = -EFAULT; |
1040 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1041 | goto done; | |
1042 | err = -ENOENT; | |
ca8def14 | 1043 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1044 | goto done; |
1045 | err = -EPERM; | |
cd3dbc19 | 1046 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1047 | goto done; |
1048 | dev = t->dev; | |
1049 | } | |
22f8cde5 SH |
1050 | unregister_netdevice(dev); |
1051 | err = 0; | |
1da177e4 LT |
1052 | break; |
1053 | ||
300aaeea | 1054 | case SIOCGETPRL: |
2b4743bd YH |
1055 | err = -EINVAL; |
1056 | if (dev == sitn->fb_tunnel_dev) | |
1057 | goto done; | |
1058 | err = -ENOENT; | |
1059 | if (!(t = netdev_priv(dev))) | |
1060 | goto done; | |
1061 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1062 | break; | |
1063 | ||
fadf6bf0 TF |
1064 | case SIOCADDPRL: |
1065 | case SIOCDELPRL: | |
1066 | case SIOCCHGPRL: | |
1067 | err = -EPERM; | |
2b4743bd | 1068 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1069 | goto done; |
1070 | err = -EINVAL; | |
cd3dbc19 | 1071 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1072 | goto done; |
1073 | err = -EFAULT; | |
1074 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1075 | goto done; | |
1076 | err = -ENOENT; | |
1077 | if (!(t = netdev_priv(dev))) | |
1078 | goto done; | |
1079 | ||
300aaeea | 1080 | switch (cmd) { |
300aaeea | 1081 | case SIOCDELPRL: |
fadf6bf0 | 1082 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1083 | break; |
1084 | case SIOCADDPRL: | |
1085 | case SIOCCHGPRL: | |
fadf6bf0 | 1086 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1087 | break; |
1088 | } | |
2b4743bd | 1089 | netdev_state_change(dev); |
fadf6bf0 TF |
1090 | break; |
1091 | ||
fa857afc YH |
1092 | #ifdef CONFIG_IPV6_SIT_6RD |
1093 | case SIOCADD6RD: | |
1094 | case SIOCCHG6RD: | |
1095 | case SIOCDEL6RD: | |
1096 | err = -EPERM; | |
1097 | if (!capable(CAP_NET_ADMIN)) | |
1098 | goto done; | |
1099 | ||
1100 | err = -EFAULT; | |
1101 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1102 | sizeof(ip6rd))) | |
1103 | goto done; | |
1104 | ||
1105 | t = netdev_priv(dev); | |
1106 | ||
1107 | if (cmd != SIOCDEL6RD) { | |
1108 | struct in6_addr prefix; | |
1109 | __be32 relay_prefix; | |
1110 | ||
1111 | err = -EINVAL; | |
1112 | if (ip6rd.relay_prefixlen > 32 || | |
1113 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1114 | goto done; | |
1115 | ||
1116 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1117 | ip6rd.prefixlen); | |
1118 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1119 | goto done; | |
91b2a3f9 YH |
1120 | if (ip6rd.relay_prefixlen) |
1121 | relay_prefix = ip6rd.relay_prefix & | |
1122 | htonl(0xffffffffUL << | |
1123 | (32 - ip6rd.relay_prefixlen)); | |
1124 | else | |
1125 | relay_prefix = 0; | |
fa857afc YH |
1126 | if (relay_prefix != ip6rd.relay_prefix) |
1127 | goto done; | |
1128 | ||
4e3fd7a0 | 1129 | t->ip6rd.prefix = prefix; |
fa857afc YH |
1130 | t->ip6rd.relay_prefix = relay_prefix; |
1131 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1132 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1133 | } else | |
e0c93948 | 1134 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1135 | |
1136 | err = 0; | |
1137 | break; | |
1138 | #endif | |
1139 | ||
1da177e4 LT |
1140 | default: |
1141 | err = -EINVAL; | |
1142 | } | |
1143 | ||
1144 | done: | |
1145 | return err; | |
1146 | } | |
1147 | ||
1da177e4 LT |
1148 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1149 | { | |
1150 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1151 | return -EINVAL; | |
1152 | dev->mtu = new_mtu; | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1326c3d5 SH |
1156 | static const struct net_device_ops ipip6_netdev_ops = { |
1157 | .ndo_uninit = ipip6_tunnel_uninit, | |
1158 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1159 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1160 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
87b6d218 | 1161 | .ndo_get_stats64= ipip6_get_stats64, |
1326c3d5 SH |
1162 | }; |
1163 | ||
15fc1f70 ED |
1164 | static void ipip6_dev_free(struct net_device *dev) |
1165 | { | |
1166 | free_percpu(dev->tstats); | |
1167 | free_netdev(dev); | |
1168 | } | |
1169 | ||
1da177e4 LT |
1170 | static void ipip6_tunnel_setup(struct net_device *dev) |
1171 | { | |
1326c3d5 | 1172 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1173 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1174 | |
1175 | dev->type = ARPHRD_SIT; | |
1176 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1177 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1178 | dev->flags = IFF_NOARP; |
f2ba025b | 1179 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1180 | dev->iflink = 0; |
1181 | dev->addr_len = 4; | |
7a97146c | 1182 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1183 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1184 | } |
1185 | ||
15fc1f70 | 1186 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1187 | { |
1326c3d5 | 1188 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1189 | |
1190 | tunnel->dev = dev; | |
1da177e4 LT |
1191 | |
1192 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1193 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1194 | ||
8a4a50f9 | 1195 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1196 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1197 | if (!dev->tstats) | |
1198 | return -ENOMEM; | |
1199 | ||
1200 | return 0; | |
1da177e4 LT |
1201 | } |
1202 | ||
dd4080ee | 1203 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1204 | { |
2941a486 | 1205 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1206 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1207 | struct net *net = dev_net(dev); |
1208 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1209 | |
1210 | tunnel->dev = dev; | |
1211 | strcpy(tunnel->parms.name, dev->name); | |
1212 | ||
1213 | iph->version = 4; | |
1214 | iph->protocol = IPPROTO_IPV6; | |
1215 | iph->ihl = 5; | |
1216 | iph->ttl = 64; | |
1217 | ||
dd4080ee ED |
1218 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1219 | if (!dev->tstats) | |
1220 | return -ENOMEM; | |
1da177e4 | 1221 | dev_hold(dev); |
cf778b00 | 1222 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1223 | return 0; |
1da177e4 LT |
1224 | } |
1225 | ||
f3723416 ND |
1226 | static void ipip6_netlink_parms(struct nlattr *data[], |
1227 | struct ip_tunnel_parm *parms) | |
1228 | { | |
1229 | memset(parms, 0, sizeof(*parms)); | |
1230 | ||
1231 | parms->iph.version = 4; | |
1232 | parms->iph.protocol = IPPROTO_IPV6; | |
1233 | parms->iph.ihl = 5; | |
1234 | parms->iph.ttl = 64; | |
1235 | ||
1236 | if (!data) | |
1237 | return; | |
1238 | ||
1239 | if (data[IFLA_IPTUN_LINK]) | |
1240 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1241 | ||
1242 | if (data[IFLA_IPTUN_LOCAL]) | |
1243 | parms->iph.saddr = nla_get_u32(data[IFLA_IPTUN_LOCAL]); | |
1244 | ||
1245 | if (data[IFLA_IPTUN_REMOTE]) | |
1246 | parms->iph.daddr = nla_get_u32(data[IFLA_IPTUN_REMOTE]); | |
1247 | ||
1248 | if (data[IFLA_IPTUN_TTL]) { | |
1249 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1250 | if (parms->iph.ttl) | |
1251 | parms->iph.frag_off = htons(IP_DF); | |
1252 | } | |
1253 | ||
1254 | if (data[IFLA_IPTUN_TOS]) | |
1255 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1256 | ||
1257 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1258 | parms->iph.frag_off = htons(IP_DF); | |
1259 | ||
1260 | if (data[IFLA_IPTUN_FLAGS]) | |
1261 | parms->i_flags = nla_get_u16(data[IFLA_IPTUN_FLAGS]); | |
1262 | } | |
1263 | ||
1264 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, | |
1265 | struct nlattr *tb[], struct nlattr *data[]) | |
1266 | { | |
1267 | struct net *net = dev_net(dev); | |
1268 | struct ip_tunnel *nt; | |
1269 | ||
1270 | nt = netdev_priv(dev); | |
1271 | ipip6_netlink_parms(data, &nt->parms); | |
1272 | ||
1273 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1274 | return -EEXIST; | |
1275 | ||
1276 | return ipip6_tunnel_create(dev); | |
1277 | } | |
1278 | ||
1279 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
1280 | struct nlattr *data[]) | |
1281 | { | |
1282 | struct ip_tunnel *t; | |
1283 | struct ip_tunnel_parm p; | |
1284 | struct net *net = dev_net(dev); | |
1285 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1286 | ||
1287 | if (dev == sitn->fb_tunnel_dev) | |
1288 | return -EINVAL; | |
1289 | ||
1290 | ipip6_netlink_parms(data, &p); | |
1291 | ||
1292 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1293 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1294 | return -EINVAL; | |
1295 | ||
1296 | t = ipip6_tunnel_locate(net, &p, 0); | |
1297 | ||
1298 | if (t) { | |
1299 | if (t->dev != dev) | |
1300 | return -EEXIST; | |
1301 | } else | |
1302 | t = netdev_priv(dev); | |
1303 | ||
1304 | ipip6_tunnel_update(t, &p); | |
1305 | return 0; | |
1306 | } | |
1307 | ||
e4c94a9c | 1308 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1309 | { |
1310 | return | |
1311 | /* IFLA_IPTUN_LINK */ | |
1312 | nla_total_size(4) + | |
1313 | /* IFLA_IPTUN_LOCAL */ | |
1314 | nla_total_size(4) + | |
1315 | /* IFLA_IPTUN_REMOTE */ | |
1316 | nla_total_size(4) + | |
1317 | /* IFLA_IPTUN_TTL */ | |
1318 | nla_total_size(1) + | |
1319 | /* IFLA_IPTUN_TOS */ | |
1320 | nla_total_size(1) + | |
a12c9a85 ND |
1321 | /* IFLA_IPTUN_PMTUDISC */ |
1322 | nla_total_size(1) + | |
1323 | /* IFLA_IPTUN_FLAGS */ | |
1324 | nla_total_size(2) + | |
ba3e3f50 ND |
1325 | 0; |
1326 | } | |
1327 | ||
e4c94a9c | 1328 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1329 | { |
1330 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1331 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1332 | ||
1333 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1334 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1335 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1336 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
a12c9a85 ND |
1337 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1338 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1339 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
1340 | nla_put_u16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) | |
ba3e3f50 ND |
1341 | goto nla_put_failure; |
1342 | return 0; | |
1343 | ||
1344 | nla_put_failure: | |
1345 | return -EMSGSIZE; | |
1346 | } | |
1347 | ||
f3723416 ND |
1348 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1349 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1350 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1351 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1352 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1353 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1354 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1355 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
1356 | }; | |
1357 | ||
ba3e3f50 ND |
1358 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1359 | .kind = "sit", | |
1360 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1361 | .policy = ipip6_policy, |
ba3e3f50 | 1362 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 ND |
1363 | .setup = ipip6_tunnel_setup, |
1364 | .newlink = ipip6_newlink, | |
1365 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1366 | .get_size = ipip6_get_size, |
1367 | .fill_info = ipip6_fill_info, | |
ba3e3f50 ND |
1368 | }; |
1369 | ||
6dcd814b | 1370 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1371 | .handler = ipip6_rcv, |
1372 | .err_handler = ipip6_err, | |
c73cb5a2 | 1373 | .priority = 1, |
1da177e4 LT |
1374 | }; |
1375 | ||
2c8c1e72 | 1376 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1377 | { |
1378 | int prio; | |
1379 | ||
1380 | for (prio = 1; prio < 4; prio++) { | |
1381 | int h; | |
1382 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1383 | struct ip_tunnel *t; |
62808f91 | 1384 | |
753ea8e9 | 1385 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1386 | while (t != NULL) { |
1387 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1388 | t = rtnl_dereference(t->next); |
62808f91 | 1389 | } |
db44575f AK |
1390 | } |
1391 | } | |
1392 | } | |
1393 | ||
2c8c1e72 | 1394 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1395 | { |
67101172 | 1396 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1397 | struct ip_tunnel *t; |
8190d900 | 1398 | int err; |
8190d900 | 1399 | |
29182176 PE |
1400 | sitn->tunnels[0] = sitn->tunnels_wc; |
1401 | sitn->tunnels[1] = sitn->tunnels_l; | |
1402 | sitn->tunnels[2] = sitn->tunnels_r; | |
1403 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1404 | ||
cd3dbc19 PE |
1405 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1406 | ipip6_tunnel_setup); | |
1407 | if (!sitn->fb_tunnel_dev) { | |
1408 | err = -ENOMEM; | |
1409 | goto err_alloc_dev; | |
1410 | } | |
be77e593 | 1411 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1412 | |
dd4080ee ED |
1413 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1414 | if (err) | |
1415 | goto err_dev_free; | |
1416 | ||
e0c93948 | 1417 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1418 | |
1419 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1420 | goto err_reg_dev; | |
1421 | ||
72b36015 TF |
1422 | t = netdev_priv(sitn->fb_tunnel_dev); |
1423 | ||
1424 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1425 | return 0; |
1426 | ||
cd3dbc19 | 1427 | err_reg_dev: |
1326c3d5 | 1428 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1429 | err_dev_free: |
1430 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1431 | err_alloc_dev: |
8190d900 PE |
1432 | return err; |
1433 | } | |
1434 | ||
2c8c1e72 | 1435 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1436 | { |
67101172 | 1437 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1438 | LIST_HEAD(list); |
8190d900 | 1439 | |
cd3dbc19 | 1440 | rtnl_lock(); |
62808f91 ED |
1441 | sit_destroy_tunnels(sitn, &list); |
1442 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1443 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1444 | rtnl_unlock(); |
8190d900 PE |
1445 | } |
1446 | ||
1447 | static struct pernet_operations sit_net_ops = { | |
1448 | .init = sit_init_net, | |
1449 | .exit = sit_exit_net, | |
67101172 EB |
1450 | .id = &sit_net_id, |
1451 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1452 | }; |
1453 | ||
89c89458 | 1454 | static void __exit sit_cleanup(void) |
1da177e4 | 1455 | { |
ba3e3f50 | 1456 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1457 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1458 | |
67101172 | 1459 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1460 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1461 | } |
1462 | ||
89c89458 | 1463 | static int __init sit_init(void) |
1da177e4 LT |
1464 | { |
1465 | int err; | |
1466 | ||
f3213831 | 1467 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1468 | |
67101172 | 1469 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1470 | if (err < 0) |
d5aa407f AD |
1471 | return err; |
1472 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1473 | if (err < 0) { | |
f3213831 | 1474 | pr_info("%s: can't add protocol\n", __func__); |
ba3e3f50 | 1475 | goto xfrm_tunnel_failed; |
d5aa407f | 1476 | } |
ba3e3f50 ND |
1477 | err = rtnl_link_register(&sit_link_ops); |
1478 | if (err < 0) | |
1479 | goto rtnl_link_failed; | |
1480 | ||
1481 | out: | |
1da177e4 | 1482 | return err; |
ba3e3f50 ND |
1483 | |
1484 | rtnl_link_failed: | |
1485 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1486 | xfrm_tunnel_failed: | |
1487 | unregister_pernet_device(&sit_net_ops); | |
1488 | goto out; | |
1da177e4 | 1489 | } |
989e5b96 JR |
1490 | |
1491 | module_init(sit_init); | |
1492 | module_exit(sit_cleanup); | |
39c85086 | 1493 | MODULE_LICENSE("GPL"); |
8909c9ad | 1494 | MODULE_ALIAS_NETDEV("sit0"); |