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