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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); |
1da177e4 | 71 | |
f99189b1 | 72 | static int sit_net_id __read_mostly; |
8190d900 | 73 | struct sit_net { |
3a43be3c ED |
74 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
75 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
76 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
77 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
78 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 79 | |
cd3dbc19 | 80 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
81 | }; |
82 | ||
4543c10d | 83 | /* |
3a43be3c | 84 | * Locking : hash tables are protected by RCU and RTNL |
4543c10d | 85 | */ |
4543c10d ED |
86 | |
87 | #define for_each_ip_tunnel_rcu(start) \ | |
88 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 89 | |
15fc1f70 ED |
90 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
91 | struct pcpu_tstats { | |
87b6d218 | 92 | u64 rx_packets; |
93 | u64 rx_bytes; | |
94 | u64 tx_packets; | |
95 | u64 tx_bytes; | |
96 | struct u64_stats_sync syncp; | |
97 | }; | |
15fc1f70 | 98 | |
87b6d218 | 99 | static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, |
100 | struct rtnl_link_stats64 *tot) | |
15fc1f70 | 101 | { |
15fc1f70 ED |
102 | int i; |
103 | ||
104 | for_each_possible_cpu(i) { | |
105 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
87b6d218 | 106 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
107 | unsigned int start; | |
108 | ||
109 | do { | |
110 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
111 | rx_packets = tstats->rx_packets; | |
112 | tx_packets = tstats->tx_packets; | |
113 | rx_bytes = tstats->rx_bytes; | |
114 | tx_bytes = tstats->tx_bytes; | |
115 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
116 | ||
117 | tot->rx_packets += rx_packets; | |
118 | tot->tx_packets += tx_packets; | |
119 | tot->rx_bytes += rx_bytes; | |
120 | tot->tx_bytes += tx_bytes; | |
15fc1f70 | 121 | } |
87b6d218 | 122 | |
123 | tot->rx_errors = dev->stats.rx_errors; | |
124 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
125 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
126 | tot->tx_dropped = dev->stats.tx_dropped; | |
127 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
128 | tot->tx_errors = dev->stats.tx_errors; | |
129 | ||
130 | return tot; | |
15fc1f70 | 131 | } |
87b6d218 | 132 | |
4543c10d ED |
133 | /* |
134 | * Must be invoked with rcu_read_lock | |
135 | */ | |
3e866703 | 136 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 137 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 138 | { |
3a43be3c ED |
139 | unsigned int h0 = HASH(remote); |
140 | unsigned int h1 = HASH(local); | |
1da177e4 | 141 | struct ip_tunnel *t; |
29182176 | 142 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 143 | |
4543c10d | 144 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 145 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
146 | remote == t->parms.iph.daddr && |
147 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
148 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
149 | return t; |
150 | } | |
4543c10d | 151 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { |
4fddbf5d SH |
152 | if (remote == t->parms.iph.daddr && |
153 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
154 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
155 | return t; |
156 | } | |
4543c10d | 157 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { |
4fddbf5d SH |
158 | if (local == t->parms.iph.saddr && |
159 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
160 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
161 | return t; |
162 | } | |
4543c10d | 163 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 164 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
165 | return t; |
166 | return NULL; | |
167 | } | |
168 | ||
3a43be3c | 169 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 170 | struct ip_tunnel_parm *parms) |
1da177e4 | 171 | { |
420fe234 YH |
172 | __be32 remote = parms->iph.daddr; |
173 | __be32 local = parms->iph.saddr; | |
3a43be3c | 174 | unsigned int h = 0; |
1da177e4 LT |
175 | int prio = 0; |
176 | ||
177 | if (remote) { | |
178 | prio |= 2; | |
179 | h ^= HASH(remote); | |
180 | } | |
181 | if (local) { | |
182 | prio |= 1; | |
183 | h ^= HASH(local); | |
184 | } | |
29182176 | 185 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
186 | } |
187 | ||
3a43be3c | 188 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 189 | struct ip_tunnel *t) |
420fe234 | 190 | { |
ca8def14 | 191 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
192 | } |
193 | ||
ca8def14 | 194 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 195 | { |
3a43be3c ED |
196 | struct ip_tunnel __rcu **tp; |
197 | struct ip_tunnel *iter; | |
198 | ||
199 | for (tp = ipip6_bucket(sitn, t); | |
200 | (iter = rtnl_dereference(*tp)) != NULL; | |
201 | tp = &iter->next) { | |
202 | if (t == iter) { | |
cf778b00 | 203 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
204 | break; |
205 | } | |
206 | } | |
207 | } | |
208 | ||
ca8def14 | 209 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 210 | { |
3a43be3c | 211 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 212 | |
cf778b00 ED |
213 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
214 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
215 | } |
216 | ||
e0c93948 | 217 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
218 | { |
219 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
220 | struct ip_tunnel *t = netdev_priv(dev); |
221 | ||
fa857afc YH |
222 | if (t->dev == sitn->fb_tunnel_dev) { |
223 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
224 | t->ip6rd.relay_prefix = 0; | |
225 | t->ip6rd.prefixlen = 16; | |
226 | t->ip6rd.relay_prefixlen = 0; | |
227 | } else { | |
228 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
229 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
230 | } | |
231 | #endif | |
232 | } | |
233 | ||
3a43be3c | 234 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 235 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 236 | { |
e69a4adc AV |
237 | __be32 remote = parms->iph.daddr; |
238 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
239 | struct ip_tunnel *t, *nt; |
240 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 241 | struct net_device *dev; |
1da177e4 | 242 | char name[IFNAMSIZ]; |
ca8def14 | 243 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 244 | |
3a43be3c ED |
245 | for (tp = __ipip6_bucket(sitn, parms); |
246 | (t = rtnl_dereference(*tp)) != NULL; | |
247 | tp = &t->next) { | |
8db99e57 | 248 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
249 | remote == t->parms.iph.daddr && |
250 | parms->link == t->parms.link) { | |
8db99e57 SH |
251 | if (create) |
252 | return NULL; | |
253 | else | |
254 | return t; | |
255 | } | |
1da177e4 LT |
256 | } |
257 | if (!create) | |
258 | goto failed; | |
259 | ||
260 | if (parms->name[0]) | |
261 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 262 | else |
15fc1f70 | 263 | strcpy(name, "sit%d"); |
1da177e4 LT |
264 | |
265 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
266 | if (dev == NULL) | |
267 | return NULL; | |
268 | ||
7a97146c PE |
269 | dev_net_set(dev, net); |
270 | ||
2941a486 | 271 | nt = netdev_priv(dev); |
1326c3d5 | 272 | |
1da177e4 | 273 | nt->parms = *parms; |
15fc1f70 ED |
274 | if (ipip6_tunnel_init(dev) < 0) |
275 | goto failed_free; | |
e0c93948 | 276 | ipip6_tunnel_clone_6rd(dev, sitn); |
1da177e4 | 277 | |
c7dc89c0 FT |
278 | if (parms->i_flags & SIT_ISATAP) |
279 | dev->priv_flags |= IFF_ISATAP; | |
280 | ||
b37d428b PE |
281 | if (register_netdevice(dev) < 0) |
282 | goto failed_free; | |
1da177e4 | 283 | |
72b36015 TF |
284 | strcpy(nt->parms.name, dev->name); |
285 | ||
1da177e4 LT |
286 | dev_hold(dev); |
287 | ||
ca8def14 | 288 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
289 | return nt; |
290 | ||
b37d428b | 291 | failed_free: |
15fc1f70 | 292 | ipip6_dev_free(dev); |
1da177e4 LT |
293 | failed: |
294 | return NULL; | |
295 | } | |
296 | ||
ef9a9d11 ED |
297 | #define for_each_prl_rcu(start) \ |
298 | for (prl = rcu_dereference(start); \ | |
299 | prl; \ | |
300 | prl = rcu_dereference(prl->next)) | |
301 | ||
fadf6bf0 | 302 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 303 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 304 | { |
ef9a9d11 | 305 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 306 | |
ef9a9d11 ED |
307 | for_each_prl_rcu(t->prl) |
308 | if (prl->addr == addr) | |
fadf6bf0 | 309 | break; |
ef9a9d11 | 310 | return prl; |
fadf6bf0 TF |
311 | |
312 | } | |
313 | ||
2b4743bd YH |
314 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
315 | struct ip_tunnel_prl __user *a) | |
300aaeea | 316 | { |
2b4743bd | 317 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
318 | struct ip_tunnel_prl_entry *prl; |
319 | unsigned int cmax, c = 0, ca, len; | |
320 | int ret = 0; | |
321 | ||
2b4743bd YH |
322 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
323 | return -EFAULT; | |
324 | cmax = kprl.datalen / sizeof(kprl); | |
325 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
326 | cmax = 1; |
327 | ||
328 | /* For simple GET or for root users, | |
329 | * we try harder to allocate. | |
330 | */ | |
331 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
332 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
333 | NULL; | |
334 | ||
ef9a9d11 | 335 | rcu_read_lock(); |
300aaeea YH |
336 | |
337 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
338 | ||
339 | if (!kp) { | |
340 | /* We don't try hard to allocate much memory for | |
341 | * non-root users. | |
342 | * For root users, retry allocating enough memory for | |
343 | * the answer. | |
344 | */ | |
345 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
346 | if (!kp) { | |
347 | ret = -ENOMEM; | |
348 | goto out; | |
349 | } | |
350 | } | |
351 | ||
352 | c = 0; | |
ef9a9d11 | 353 | for_each_prl_rcu(t->prl) { |
298bf12d | 354 | if (c >= cmax) |
300aaeea | 355 | break; |
2b4743bd | 356 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
357 | continue; |
358 | kp[c].addr = prl->addr; | |
359 | kp[c].flags = prl->flags; | |
360 | c++; | |
2b4743bd | 361 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
362 | break; |
363 | } | |
364 | out: | |
ef9a9d11 | 365 | rcu_read_unlock(); |
300aaeea YH |
366 | |
367 | len = sizeof(*kp) * c; | |
2b4743bd YH |
368 | ret = 0; |
369 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
370 | ret = -EFAULT; | |
300aaeea YH |
371 | |
372 | kfree(kp); | |
300aaeea | 373 | |
2b4743bd | 374 | return ret; |
300aaeea YH |
375 | } |
376 | ||
fadf6bf0 TF |
377 | static int |
378 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
379 | { | |
380 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
381 | int err = 0; |
382 | ||
0009ae1f YH |
383 | if (a->addr == htonl(INADDR_ANY)) |
384 | return -EINVAL; | |
385 | ||
aac4dddc | 386 | ASSERT_RTNL(); |
fadf6bf0 | 387 | |
3a43be3c | 388 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 389 | if (p->addr == a->addr) { |
ef9a9d11 ED |
390 | if (chg) { |
391 | p->flags = a->flags; | |
392 | goto out; | |
393 | } | |
3fcfa129 YH |
394 | err = -EEXIST; |
395 | goto out; | |
fadf6bf0 TF |
396 | } |
397 | } | |
398 | ||
3fcfa129 YH |
399 | if (chg) { |
400 | err = -ENXIO; | |
401 | goto out; | |
402 | } | |
fadf6bf0 TF |
403 | |
404 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
405 | if (!p) { |
406 | err = -ENOBUFS; | |
407 | goto out; | |
408 | } | |
fadf6bf0 | 409 | |
fadf6bf0 | 410 | p->next = t->prl; |
300aaeea YH |
411 | p->addr = a->addr; |
412 | p->flags = a->flags; | |
ef9a9d11 | 413 | t->prl_count++; |
cf778b00 | 414 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 415 | out: |
3fcfa129 | 416 | return err; |
fadf6bf0 TF |
417 | } |
418 | ||
ef9a9d11 ED |
419 | static void prl_list_destroy_rcu(struct rcu_head *head) |
420 | { | |
421 | struct ip_tunnel_prl_entry *p, *n; | |
422 | ||
423 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
424 | do { | |
753ea8e9 | 425 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
426 | kfree(p); |
427 | p = n; | |
428 | } while (p); | |
429 | } | |
430 | ||
fadf6bf0 TF |
431 | static int |
432 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
433 | { | |
753ea8e9 ED |
434 | struct ip_tunnel_prl_entry *x; |
435 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
436 | int err = 0; |
437 | ||
aac4dddc | 438 | ASSERT_RTNL(); |
fadf6bf0 | 439 | |
0009ae1f | 440 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
441 | for (p = &t->prl; |
442 | (x = rtnl_dereference(*p)) != NULL; | |
443 | p = &x->next) { | |
444 | if (x->addr == a->addr) { | |
fadf6bf0 | 445 | *p = x->next; |
11c476f3 | 446 | kfree_rcu(x, rcu_head); |
300aaeea | 447 | t->prl_count--; |
3fcfa129 | 448 | goto out; |
fadf6bf0 TF |
449 | } |
450 | } | |
3fcfa129 | 451 | err = -ENXIO; |
fadf6bf0 | 452 | } else { |
753ea8e9 ED |
453 | x = rtnl_dereference(t->prl); |
454 | if (x) { | |
ef9a9d11 | 455 | t->prl_count = 0; |
ef9a9d11 ED |
456 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
457 | t->prl = NULL; | |
fadf6bf0 TF |
458 | } |
459 | } | |
3fcfa129 | 460 | out: |
4b279601 | 461 | return err; |
fadf6bf0 TF |
462 | } |
463 | ||
fadf6bf0 | 464 | static int |
b71d1d42 | 465 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 466 | { |
3fcfa129 | 467 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
468 | int ok = 1; |
469 | ||
ef9a9d11 | 470 | rcu_read_lock(); |
3fcfa129 | 471 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 472 | if (p) { |
300aaeea | 473 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
474 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
475 | else | |
476 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
477 | } else { | |
b71d1d42 ED |
478 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
479 | ||
fadf6bf0 TF |
480 | if (ipv6_addr_is_isatap(addr6) && |
481 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 482 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
483 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
484 | else | |
485 | ok = 0; | |
486 | } | |
ef9a9d11 | 487 | rcu_read_unlock(); |
fadf6bf0 TF |
488 | return ok; |
489 | } | |
490 | ||
1da177e4 LT |
491 | static void ipip6_tunnel_uninit(struct net_device *dev) |
492 | { | |
ca8def14 PE |
493 | struct net *net = dev_net(dev); |
494 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
495 | ||
cd3dbc19 | 496 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 497 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 498 | } else { |
ca8def14 | 499 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 500 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 501 | } |
3a43be3c | 502 | dev_put(dev); |
1da177e4 LT |
503 | } |
504 | ||
505 | ||
c73cb5a2 | 506 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 507 | { |
1da177e4 | 508 | |
071f92d0 | 509 | /* All the routers (except for Linux) return only |
1da177e4 LT |
510 | 8 bytes of packet payload. It means, that precise relaying of |
511 | ICMP in the real Internet is absolutely infeasible. | |
512 | */ | |
b71d1d42 | 513 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
514 | const int type = icmp_hdr(skb)->type; |
515 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 516 | struct ip_tunnel *t; |
c73cb5a2 | 517 | int err; |
1da177e4 LT |
518 | |
519 | switch (type) { | |
520 | default: | |
521 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 522 | return 0; |
1da177e4 LT |
523 | |
524 | case ICMP_DEST_UNREACH: | |
525 | switch (code) { | |
526 | case ICMP_SR_FAILED: | |
527 | case ICMP_PORT_UNREACH: | |
528 | /* Impossible event. */ | |
c73cb5a2 | 529 | return 0; |
1da177e4 LT |
530 | default: |
531 | /* All others are translated to HOST_UNREACH. | |
532 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
533 | I believe they are just ether pollution. --ANK | |
534 | */ | |
535 | break; | |
536 | } | |
537 | break; | |
538 | case ICMP_TIME_EXCEEDED: | |
539 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 540 | return 0; |
1da177e4 | 541 | break; |
ec18d9a2 DM |
542 | case ICMP_REDIRECT: |
543 | break; | |
1da177e4 LT |
544 | } |
545 | ||
c73cb5a2 KM |
546 | err = -ENOENT; |
547 | ||
4fddbf5d SH |
548 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
549 | skb->dev, | |
550 | iph->daddr, | |
551 | iph->saddr); | |
36393395 DM |
552 | if (t == NULL) |
553 | goto out; | |
554 | ||
555 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
556 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
557 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
558 | err = 0; | |
559 | goto out; | |
560 | } | |
ec18d9a2 DM |
561 | if (type == ICMP_REDIRECT) { |
562 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
563 | IPPROTO_IPV6, 0); | |
564 | err = 0; | |
565 | goto out; | |
566 | } | |
36393395 DM |
567 | |
568 | if (t->parms.iph.daddr == 0) | |
1da177e4 | 569 | goto out; |
c73cb5a2 KM |
570 | |
571 | err = 0; | |
1da177e4 LT |
572 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
573 | goto out; | |
574 | ||
bb80087a | 575 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
576 | t->err_count++; |
577 | else | |
578 | t->err_count = 1; | |
579 | t->err_time = jiffies; | |
580 | out: | |
c73cb5a2 | 581 | return err; |
1da177e4 LT |
582 | } |
583 | ||
b71d1d42 | 584 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
585 | { |
586 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 587 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
588 | } |
589 | ||
590 | static int ipip6_rcv(struct sk_buff *skb) | |
591 | { | |
b71d1d42 | 592 | const struct iphdr *iph; |
1da177e4 LT |
593 | struct ip_tunnel *tunnel; |
594 | ||
595 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
596 | goto out; | |
597 | ||
eddc9ec5 | 598 | iph = ip_hdr(skb); |
1da177e4 | 599 | |
4fddbf5d SH |
600 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
601 | iph->saddr, iph->daddr); | |
602 | if (tunnel != NULL) { | |
15fc1f70 ED |
603 | struct pcpu_tstats *tstats; |
604 | ||
1da177e4 | 605 | secpath_reset(skb); |
b0e380b1 | 606 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 607 | skb_reset_network_header(skb); |
8cdfab8a | 608 | IPCB(skb)->flags = 0; |
1da177e4 LT |
609 | skb->protocol = htons(ETH_P_IPV6); |
610 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
611 | |
612 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 613 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 614 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
615 | kfree_skb(skb); |
616 | return 0; | |
617 | } | |
d19d56dd | 618 | |
15fc1f70 ED |
619 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
620 | tstats->rx_packets++; | |
621 | tstats->rx_bytes += skb->len; | |
622 | ||
623 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 624 | |
1da177e4 | 625 | ipip6_ecn_decapsulate(iph, skb); |
8990f468 | 626 | |
caf586e5 | 627 | netif_rx(skb); |
8990f468 | 628 | |
1da177e4 LT |
629 | return 0; |
630 | } | |
631 | ||
6dcdd1b3 | 632 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 633 | return 1; |
1da177e4 | 634 | out: |
36ca34cc | 635 | kfree_skb(skb); |
1da177e4 LT |
636 | return 0; |
637 | } | |
638 | ||
fa857afc YH |
639 | /* |
640 | * Returns the embedded IPv4 address if the IPv6 address | |
641 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
642 | */ | |
643 | static inline | |
b71d1d42 | 644 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) |
1da177e4 | 645 | { |
e69a4adc | 646 | __be32 dst = 0; |
1da177e4 | 647 | |
fa857afc YH |
648 | #ifdef CONFIG_IPV6_SIT_6RD |
649 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
650 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 651 | unsigned int pbw0, pbi0; |
fa857afc YH |
652 | int pbi1; |
653 | u32 d; | |
654 | ||
655 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
656 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
657 | ||
e7db38c3 | 658 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
659 | tunnel->ip6rd.relay_prefixlen; |
660 | ||
661 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
662 | if (pbi1 > 0) | |
e7db38c3 | 663 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
664 | (32 - pbi1); |
665 | ||
666 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
667 | } | |
668 | #else | |
1da177e4 | 669 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 670 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
671 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
672 | } | |
fa857afc | 673 | #endif |
1da177e4 LT |
674 | return dst; |
675 | } | |
676 | ||
677 | /* | |
678 | * This function assumes it is being called from dev_queue_xmit() | |
679 | * and that skb is filled properly by that function. | |
680 | */ | |
681 | ||
6fef4c0c SH |
682 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
683 | struct net_device *dev) | |
1da177e4 | 684 | { |
2941a486 | 685 | struct ip_tunnel *tunnel = netdev_priv(dev); |
15fc1f70 | 686 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
687 | const struct iphdr *tiph = &tunnel->parms.iph; |
688 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 689 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 690 | __be16 df = tiph->frag_off; |
1da177e4 | 691 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 692 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 693 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 694 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 695 | __be32 dst = tiph->daddr; |
31e4543d | 696 | struct flowi4 fl4; |
1da177e4 | 697 | int mtu; |
b71d1d42 | 698 | const struct in6_addr *addr6; |
1da177e4 LT |
699 | int addr_type; |
700 | ||
1da177e4 LT |
701 | if (skb->protocol != htons(ETH_P_IPV6)) |
702 | goto tx_error; | |
703 | ||
c2bceb3d LEM |
704 | if (tos == 1) |
705 | tos = ipv6_get_dsfield(iph6); | |
706 | ||
c7dc89c0 FT |
707 | /* ISATAP (RFC4214) - must come before 6to4 */ |
708 | if (dev->priv_flags & IFF_ISATAP) { | |
709 | struct neighbour *neigh = NULL; | |
1e2927b0 | 710 | bool do_tx_error = false; |
c7dc89c0 | 711 | |
adf30907 | 712 | if (skb_dst(skb)) |
1e2927b0 | 713 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
714 | |
715 | if (neigh == NULL) { | |
e87cc472 | 716 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
c7dc89c0 FT |
717 | goto tx_error; |
718 | } | |
719 | ||
3e866703 | 720 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
721 | addr_type = ipv6_addr_type(addr6); |
722 | ||
723 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
724 | ipv6_addr_is_isatap(addr6)) | |
725 | dst = addr6->s6_addr32[3]; | |
726 | else | |
1e2927b0 DM |
727 | do_tx_error = true; |
728 | ||
729 | neigh_release(neigh); | |
730 | if (do_tx_error) | |
c7dc89c0 FT |
731 | goto tx_error; |
732 | } | |
733 | ||
1da177e4 | 734 | if (!dst) |
fa857afc | 735 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
736 | |
737 | if (!dst) { | |
738 | struct neighbour *neigh = NULL; | |
1e2927b0 | 739 | bool do_tx_error = false; |
1da177e4 | 740 | |
adf30907 | 741 | if (skb_dst(skb)) |
1e2927b0 | 742 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
743 | |
744 | if (neigh == NULL) { | |
e87cc472 | 745 | net_dbg_ratelimited("sit: nexthop == NULL\n"); |
1da177e4 LT |
746 | goto tx_error; |
747 | } | |
748 | ||
3e866703 | 749 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
750 | addr_type = ipv6_addr_type(addr6); |
751 | ||
752 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 753 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
754 | addr_type = ipv6_addr_type(addr6); |
755 | } | |
756 | ||
1e2927b0 DM |
757 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
758 | dst = addr6->s6_addr32[3]; | |
759 | else | |
760 | do_tx_error = true; | |
1da177e4 | 761 | |
1e2927b0 DM |
762 | neigh_release(neigh); |
763 | if (do_tx_error) | |
764 | goto tx_error; | |
1da177e4 LT |
765 | } |
766 | ||
31e4543d | 767 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
768 | dst, tiph->saddr, |
769 | 0, 0, | |
770 | IPPROTO_IPV6, RT_TOS(tos), | |
771 | tunnel->parms.link); | |
772 | if (IS_ERR(rt)) { | |
773 | dev->stats.tx_carrier_errors++; | |
774 | goto tx_error_icmp; | |
1da177e4 LT |
775 | } |
776 | if (rt->rt_type != RTN_UNICAST) { | |
777 | ip_rt_put(rt); | |
15fc1f70 | 778 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
779 | goto tx_error_icmp; |
780 | } | |
d8d1f30b | 781 | tdev = rt->dst.dev; |
1da177e4 LT |
782 | |
783 | if (tdev == dev) { | |
784 | ip_rt_put(rt); | |
15fc1f70 | 785 | dev->stats.collisions++; |
1da177e4 LT |
786 | goto tx_error; |
787 | } | |
788 | ||
292f4f3c | 789 | if (df) { |
d8d1f30b | 790 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 791 | |
292f4f3c | 792 | if (mtu < 68) { |
15fc1f70 | 793 | dev->stats.collisions++; |
292f4f3c HX |
794 | ip_rt_put(rt); |
795 | goto tx_error; | |
796 | } | |
1da177e4 | 797 | |
292f4f3c HX |
798 | if (mtu < IPV6_MIN_MTU) { |
799 | mtu = IPV6_MIN_MTU; | |
800 | df = 0; | |
801 | } | |
802 | ||
803 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 804 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c HX |
805 | |
806 | if (skb->len > mtu) { | |
3ffe533c | 807 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
808 | ip_rt_put(rt); |
809 | goto tx_error; | |
810 | } | |
1da177e4 LT |
811 | } |
812 | ||
813 | if (tunnel->err_count > 0) { | |
bb80087a WY |
814 | if (time_before(jiffies, |
815 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
816 | tunnel->err_count--; |
817 | dst_link_failure(skb); | |
818 | } else | |
819 | tunnel->err_count = 0; | |
820 | } | |
821 | ||
822 | /* | |
823 | * Okay, now see if we can stuff it in the buffer as-is. | |
824 | */ | |
825 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
826 | ||
cfbba49d PM |
827 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
828 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
829 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
830 | if (!new_skb) { | |
831 | ip_rt_put(rt); | |
15fc1f70 | 832 | dev->stats.tx_dropped++; |
1da177e4 | 833 | dev_kfree_skb(skb); |
6ed10654 | 834 | return NETDEV_TX_OK; |
1da177e4 LT |
835 | } |
836 | if (skb->sk) | |
837 | skb_set_owner_w(new_skb, skb->sk); | |
838 | dev_kfree_skb(skb); | |
839 | skb = new_skb; | |
0660e03f | 840 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
841 | } |
842 | ||
b0e380b1 | 843 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
844 | skb_push(skb, sizeof(struct iphdr)); |
845 | skb_reset_network_header(skb); | |
1da177e4 | 846 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 847 | IPCB(skb)->flags = 0; |
adf30907 | 848 | skb_dst_drop(skb); |
d8d1f30b | 849 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
850 | |
851 | /* | |
852 | * Push down and install the IPIP header. | |
853 | */ | |
854 | ||
eddc9ec5 | 855 | iph = ip_hdr(skb); |
1da177e4 LT |
856 | iph->version = 4; |
857 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 858 | iph->frag_off = df; |
1da177e4 LT |
859 | iph->protocol = IPPROTO_IPV6; |
860 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
301102cc DM |
861 | iph->daddr = fl4.daddr; |
862 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
863 | |
864 | if ((iph->ttl = tiph->ttl) == 0) | |
865 | iph->ttl = iph6->hop_limit; | |
866 | ||
867 | nf_reset(skb); | |
15fc1f70 ED |
868 | tstats = this_cpu_ptr(dev->tstats); |
869 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 870 | return NETDEV_TX_OK; |
1da177e4 LT |
871 | |
872 | tx_error_icmp: | |
873 | dst_link_failure(skb); | |
874 | tx_error: | |
15fc1f70 | 875 | dev->stats.tx_errors++; |
1da177e4 | 876 | dev_kfree_skb(skb); |
6ed10654 | 877 | return NETDEV_TX_OK; |
1da177e4 LT |
878 | } |
879 | ||
8a4a50f9 MS |
880 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
881 | { | |
882 | struct net_device *tdev = NULL; | |
883 | struct ip_tunnel *tunnel; | |
b71d1d42 | 884 | const struct iphdr *iph; |
31e4543d | 885 | struct flowi4 fl4; |
8a4a50f9 MS |
886 | |
887 | tunnel = netdev_priv(dev); | |
888 | iph = &tunnel->parms.iph; | |
889 | ||
890 | if (iph->daddr) { | |
31e4543d | 891 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
892 | iph->daddr, iph->saddr, |
893 | 0, 0, | |
894 | IPPROTO_IPV6, | |
895 | RT_TOS(iph->tos), | |
896 | tunnel->parms.link); | |
b23dd4fe DM |
897 | |
898 | if (!IS_ERR(rt)) { | |
d8d1f30b | 899 | tdev = rt->dst.dev; |
8a4a50f9 MS |
900 | ip_rt_put(rt); |
901 | } | |
902 | dev->flags |= IFF_POINTOPOINT; | |
903 | } | |
904 | ||
905 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 906 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
907 | |
908 | if (tdev) { | |
909 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
910 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
911 | if (dev->mtu < IPV6_MIN_MTU) | |
912 | dev->mtu = IPV6_MIN_MTU; | |
913 | } | |
914 | dev->iflink = tunnel->parms.link; | |
915 | } | |
916 | ||
1da177e4 LT |
917 | static int |
918 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
919 | { | |
920 | int err = 0; | |
921 | struct ip_tunnel_parm p; | |
fadf6bf0 | 922 | struct ip_tunnel_prl prl; |
1da177e4 | 923 | struct ip_tunnel *t; |
ca8def14 PE |
924 | struct net *net = dev_net(dev); |
925 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
926 | #ifdef CONFIG_IPV6_SIT_6RD |
927 | struct ip_tunnel_6rd ip6rd; | |
928 | #endif | |
1da177e4 LT |
929 | |
930 | switch (cmd) { | |
931 | case SIOCGETTUNNEL: | |
fa857afc YH |
932 | #ifdef CONFIG_IPV6_SIT_6RD |
933 | case SIOCGET6RD: | |
934 | #endif | |
1da177e4 | 935 | t = NULL; |
cd3dbc19 | 936 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
937 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
938 | err = -EFAULT; | |
939 | break; | |
940 | } | |
ca8def14 | 941 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
942 | } |
943 | if (t == NULL) | |
2941a486 | 944 | t = netdev_priv(dev); |
fa857afc YH |
945 | |
946 | err = -EFAULT; | |
947 | if (cmd == SIOCGETTUNNEL) { | |
948 | memcpy(&p, &t->parms, sizeof(p)); | |
949 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
950 | sizeof(p))) | |
951 | goto done; | |
952 | #ifdef CONFIG_IPV6_SIT_6RD | |
953 | } else { | |
4e3fd7a0 | 954 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
955 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
956 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
957 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
958 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
959 | sizeof(ip6rd))) | |
960 | goto done; | |
961 | #endif | |
962 | } | |
963 | err = 0; | |
1da177e4 LT |
964 | break; |
965 | ||
966 | case SIOCADDTUNNEL: | |
967 | case SIOCCHGTUNNEL: | |
968 | err = -EPERM; | |
969 | if (!capable(CAP_NET_ADMIN)) | |
970 | goto done; | |
971 | ||
972 | err = -EFAULT; | |
973 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
974 | goto done; | |
975 | ||
976 | err = -EINVAL; | |
977 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
978 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
979 | goto done; | |
980 | if (p.iph.ttl) | |
981 | p.iph.frag_off |= htons(IP_DF); | |
982 | ||
ca8def14 | 983 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 984 | |
cd3dbc19 | 985 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
986 | if (t != NULL) { |
987 | if (t->dev != dev) { | |
988 | err = -EEXIST; | |
989 | break; | |
990 | } | |
991 | } else { | |
992 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
993 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
994 | err = -EINVAL; | |
995 | break; | |
996 | } | |
2941a486 | 997 | t = netdev_priv(dev); |
ca8def14 | 998 | ipip6_tunnel_unlink(sitn, t); |
74b0b85b | 999 | synchronize_net(); |
1da177e4 LT |
1000 | t->parms.iph.saddr = p.iph.saddr; |
1001 | t->parms.iph.daddr = p.iph.daddr; | |
1002 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1003 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 1004 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
1005 | netdev_state_change(dev); |
1006 | } | |
1007 | } | |
1008 | ||
1009 | if (t) { | |
1010 | err = 0; | |
1011 | if (cmd == SIOCCHGTUNNEL) { | |
1012 | t->parms.iph.ttl = p.iph.ttl; | |
1013 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
1014 | if (t->parms.link != p.link) { |
1015 | t->parms.link = p.link; | |
1016 | ipip6_tunnel_bind_dev(dev); | |
1017 | netdev_state_change(dev); | |
1018 | } | |
1da177e4 LT |
1019 | } |
1020 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1021 | err = -EFAULT; | |
1022 | } else | |
1023 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1024 | break; | |
1025 | ||
1026 | case SIOCDELTUNNEL: | |
1027 | err = -EPERM; | |
1028 | if (!capable(CAP_NET_ADMIN)) | |
1029 | goto done; | |
1030 | ||
cd3dbc19 | 1031 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1032 | err = -EFAULT; |
1033 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1034 | goto done; | |
1035 | err = -ENOENT; | |
ca8def14 | 1036 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1037 | goto done; |
1038 | err = -EPERM; | |
cd3dbc19 | 1039 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1040 | goto done; |
1041 | dev = t->dev; | |
1042 | } | |
22f8cde5 SH |
1043 | unregister_netdevice(dev); |
1044 | err = 0; | |
1da177e4 LT |
1045 | break; |
1046 | ||
300aaeea | 1047 | case SIOCGETPRL: |
2b4743bd YH |
1048 | err = -EINVAL; |
1049 | if (dev == sitn->fb_tunnel_dev) | |
1050 | goto done; | |
1051 | err = -ENOENT; | |
1052 | if (!(t = netdev_priv(dev))) | |
1053 | goto done; | |
1054 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1055 | break; | |
1056 | ||
fadf6bf0 TF |
1057 | case SIOCADDPRL: |
1058 | case SIOCDELPRL: | |
1059 | case SIOCCHGPRL: | |
1060 | err = -EPERM; | |
2b4743bd | 1061 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
1062 | goto done; |
1063 | err = -EINVAL; | |
cd3dbc19 | 1064 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1065 | goto done; |
1066 | err = -EFAULT; | |
1067 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1068 | goto done; | |
1069 | err = -ENOENT; | |
1070 | if (!(t = netdev_priv(dev))) | |
1071 | goto done; | |
1072 | ||
300aaeea | 1073 | switch (cmd) { |
300aaeea | 1074 | case SIOCDELPRL: |
fadf6bf0 | 1075 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1076 | break; |
1077 | case SIOCADDPRL: | |
1078 | case SIOCCHGPRL: | |
fadf6bf0 | 1079 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1080 | break; |
1081 | } | |
2b4743bd | 1082 | netdev_state_change(dev); |
fadf6bf0 TF |
1083 | break; |
1084 | ||
fa857afc YH |
1085 | #ifdef CONFIG_IPV6_SIT_6RD |
1086 | case SIOCADD6RD: | |
1087 | case SIOCCHG6RD: | |
1088 | case SIOCDEL6RD: | |
1089 | err = -EPERM; | |
1090 | if (!capable(CAP_NET_ADMIN)) | |
1091 | goto done; | |
1092 | ||
1093 | err = -EFAULT; | |
1094 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1095 | sizeof(ip6rd))) | |
1096 | goto done; | |
1097 | ||
1098 | t = netdev_priv(dev); | |
1099 | ||
1100 | if (cmd != SIOCDEL6RD) { | |
1101 | struct in6_addr prefix; | |
1102 | __be32 relay_prefix; | |
1103 | ||
1104 | err = -EINVAL; | |
1105 | if (ip6rd.relay_prefixlen > 32 || | |
1106 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1107 | goto done; | |
1108 | ||
1109 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1110 | ip6rd.prefixlen); | |
1111 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1112 | goto done; | |
91b2a3f9 YH |
1113 | if (ip6rd.relay_prefixlen) |
1114 | relay_prefix = ip6rd.relay_prefix & | |
1115 | htonl(0xffffffffUL << | |
1116 | (32 - ip6rd.relay_prefixlen)); | |
1117 | else | |
1118 | relay_prefix = 0; | |
fa857afc YH |
1119 | if (relay_prefix != ip6rd.relay_prefix) |
1120 | goto done; | |
1121 | ||
4e3fd7a0 | 1122 | t->ip6rd.prefix = prefix; |
fa857afc YH |
1123 | t->ip6rd.relay_prefix = relay_prefix; |
1124 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1125 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1126 | } else | |
e0c93948 | 1127 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1128 | |
1129 | err = 0; | |
1130 | break; | |
1131 | #endif | |
1132 | ||
1da177e4 LT |
1133 | default: |
1134 | err = -EINVAL; | |
1135 | } | |
1136 | ||
1137 | done: | |
1138 | return err; | |
1139 | } | |
1140 | ||
1da177e4 LT |
1141 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1142 | { | |
1143 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1144 | return -EINVAL; | |
1145 | dev->mtu = new_mtu; | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1326c3d5 SH |
1149 | static const struct net_device_ops ipip6_netdev_ops = { |
1150 | .ndo_uninit = ipip6_tunnel_uninit, | |
1151 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1152 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1153 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
87b6d218 | 1154 | .ndo_get_stats64= ipip6_get_stats64, |
1326c3d5 SH |
1155 | }; |
1156 | ||
15fc1f70 ED |
1157 | static void ipip6_dev_free(struct net_device *dev) |
1158 | { | |
1159 | free_percpu(dev->tstats); | |
1160 | free_netdev(dev); | |
1161 | } | |
1162 | ||
1da177e4 LT |
1163 | static void ipip6_tunnel_setup(struct net_device *dev) |
1164 | { | |
1326c3d5 | 1165 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1166 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1167 | |
1168 | dev->type = ARPHRD_SIT; | |
1169 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1170 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1171 | dev->flags = IFF_NOARP; |
f2ba025b | 1172 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1173 | dev->iflink = 0; |
1174 | dev->addr_len = 4; | |
7a97146c | 1175 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1176 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1177 | } |
1178 | ||
15fc1f70 | 1179 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1180 | { |
1326c3d5 | 1181 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1182 | |
1183 | tunnel->dev = dev; | |
1da177e4 LT |
1184 | |
1185 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1186 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1187 | ||
8a4a50f9 | 1188 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1189 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1190 | if (!dev->tstats) | |
1191 | return -ENOMEM; | |
1192 | ||
1193 | return 0; | |
1da177e4 LT |
1194 | } |
1195 | ||
dd4080ee | 1196 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1197 | { |
2941a486 | 1198 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1199 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1200 | struct net *net = dev_net(dev); |
1201 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1202 | |
1203 | tunnel->dev = dev; | |
1204 | strcpy(tunnel->parms.name, dev->name); | |
1205 | ||
1206 | iph->version = 4; | |
1207 | iph->protocol = IPPROTO_IPV6; | |
1208 | iph->ihl = 5; | |
1209 | iph->ttl = 64; | |
1210 | ||
dd4080ee ED |
1211 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1212 | if (!dev->tstats) | |
1213 | return -ENOMEM; | |
1da177e4 | 1214 | dev_hold(dev); |
cf778b00 | 1215 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1216 | return 0; |
1da177e4 LT |
1217 | } |
1218 | ||
6dcd814b | 1219 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1220 | .handler = ipip6_rcv, |
1221 | .err_handler = ipip6_err, | |
c73cb5a2 | 1222 | .priority = 1, |
1da177e4 LT |
1223 | }; |
1224 | ||
2c8c1e72 | 1225 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1226 | { |
1227 | int prio; | |
1228 | ||
1229 | for (prio = 1; prio < 4; prio++) { | |
1230 | int h; | |
1231 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1232 | struct ip_tunnel *t; |
62808f91 | 1233 | |
753ea8e9 | 1234 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1235 | while (t != NULL) { |
1236 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1237 | t = rtnl_dereference(t->next); |
62808f91 | 1238 | } |
db44575f AK |
1239 | } |
1240 | } | |
1241 | } | |
1242 | ||
2c8c1e72 | 1243 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1244 | { |
67101172 | 1245 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1246 | struct ip_tunnel *t; |
8190d900 | 1247 | int err; |
8190d900 | 1248 | |
29182176 PE |
1249 | sitn->tunnels[0] = sitn->tunnels_wc; |
1250 | sitn->tunnels[1] = sitn->tunnels_l; | |
1251 | sitn->tunnels[2] = sitn->tunnels_r; | |
1252 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1253 | ||
cd3dbc19 PE |
1254 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1255 | ipip6_tunnel_setup); | |
1256 | if (!sitn->fb_tunnel_dev) { | |
1257 | err = -ENOMEM; | |
1258 | goto err_alloc_dev; | |
1259 | } | |
be77e593 | 1260 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1261 | |
dd4080ee ED |
1262 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1263 | if (err) | |
1264 | goto err_dev_free; | |
1265 | ||
e0c93948 | 1266 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1267 | |
1268 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1269 | goto err_reg_dev; | |
1270 | ||
72b36015 TF |
1271 | t = netdev_priv(sitn->fb_tunnel_dev); |
1272 | ||
1273 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1274 | return 0; |
1275 | ||
cd3dbc19 | 1276 | err_reg_dev: |
1326c3d5 | 1277 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1278 | err_dev_free: |
1279 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1280 | err_alloc_dev: |
8190d900 PE |
1281 | return err; |
1282 | } | |
1283 | ||
2c8c1e72 | 1284 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1285 | { |
67101172 | 1286 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1287 | LIST_HEAD(list); |
8190d900 | 1288 | |
cd3dbc19 | 1289 | rtnl_lock(); |
62808f91 ED |
1290 | sit_destroy_tunnels(sitn, &list); |
1291 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1292 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1293 | rtnl_unlock(); |
8190d900 PE |
1294 | } |
1295 | ||
1296 | static struct pernet_operations sit_net_ops = { | |
1297 | .init = sit_init_net, | |
1298 | .exit = sit_exit_net, | |
67101172 EB |
1299 | .id = &sit_net_id, |
1300 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1301 | }; |
1302 | ||
89c89458 | 1303 | static void __exit sit_cleanup(void) |
1da177e4 | 1304 | { |
c73cb5a2 | 1305 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1306 | |
67101172 | 1307 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1308 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1309 | } |
1310 | ||
89c89458 | 1311 | static int __init sit_init(void) |
1da177e4 LT |
1312 | { |
1313 | int err; | |
1314 | ||
f3213831 | 1315 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1316 | |
67101172 | 1317 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1318 | if (err < 0) |
d5aa407f AD |
1319 | return err; |
1320 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1321 | if (err < 0) { | |
1322 | unregister_pernet_device(&sit_net_ops); | |
f3213831 | 1323 | pr_info("%s: can't add protocol\n", __func__); |
d5aa407f | 1324 | } |
1da177e4 | 1325 | return err; |
1da177e4 | 1326 | } |
989e5b96 JR |
1327 | |
1328 | module_init(sit_init); | |
1329 | module_exit(sit_cleanup); | |
39c85086 | 1330 | MODULE_LICENSE("GPL"); |
8909c9ad | 1331 | MODULE_ALIAS_NETDEV("sit0"); |