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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> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
1da177e4 LT |
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> | |
c5441932 | 52 | #include <net/ip_tunnels.h> |
1da177e4 LT |
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 | ||
e87a8f24 | 65 | #define IP6_SIT_HASH_SIZE 16 |
e69a4adc | 66 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 67 | |
f4e0b4c5 ND |
68 | static bool log_ecn_error = true; |
69 | module_param(log_ecn_error, bool, 0644); | |
70 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
71 | ||
15fc1f70 | 72 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 73 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 74 | static void ipip6_dev_free(struct net_device *dev); |
218774dc HFS |
75 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
76 | __be32 *v4dst); | |
ba3e3f50 | 77 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 78 | |
c7d03a00 | 79 | static unsigned int sit_net_id __read_mostly; |
8190d900 | 80 | struct sit_net { |
e87a8f24 JK |
81 | struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; |
82 | struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; | |
83 | struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; | |
3a43be3c ED |
84 | struct ip_tunnel __rcu *tunnels_wc[1]; |
85 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 86 | |
cd3dbc19 | 87 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
88 | }; |
89 | ||
4543c10d ED |
90 | /* |
91 | * Must be invoked with rcu_read_lock | |
92 | */ | |
3e866703 | 93 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
3051fbec DA |
94 | struct net_device *dev, |
95 | __be32 remote, __be32 local, | |
96 | int sifindex) | |
1da177e4 | 97 | { |
3a43be3c ED |
98 | unsigned int h0 = HASH(remote); |
99 | unsigned int h1 = HASH(local); | |
1da177e4 | 100 | struct ip_tunnel *t; |
29182176 | 101 | struct sit_net *sitn = net_generic(net, sit_net_id); |
3051fbec | 102 | int ifindex = dev ? dev->ifindex : 0; |
1da177e4 | 103 | |
e086cadc | 104 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 105 | if (local == t->parms.iph.saddr && |
4fddbf5d | 106 | remote == t->parms.iph.daddr && |
3051fbec DA |
107 | (!dev || !t->parms.link || ifindex == t->parms.link || |
108 | sifindex == t->parms.link) && | |
4fddbf5d | 109 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
110 | return t; |
111 | } | |
e086cadc | 112 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d | 113 | if (remote == t->parms.iph.daddr && |
3051fbec DA |
114 | (!dev || !t->parms.link || ifindex == t->parms.link || |
115 | sifindex == t->parms.link) && | |
4fddbf5d | 116 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
117 | return t; |
118 | } | |
e086cadc | 119 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d | 120 | if (local == t->parms.iph.saddr && |
3051fbec DA |
121 | (!dev || !t->parms.link || ifindex == t->parms.link || |
122 | sifindex == t->parms.link) && | |
4fddbf5d | 123 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
124 | return t; |
125 | } | |
4543c10d | 126 | t = rcu_dereference(sitn->tunnels_wc[0]); |
53b24b8f | 127 | if (t && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
128 | return t; |
129 | return NULL; | |
130 | } | |
131 | ||
3a43be3c | 132 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 133 | struct ip_tunnel_parm *parms) |
1da177e4 | 134 | { |
420fe234 YH |
135 | __be32 remote = parms->iph.daddr; |
136 | __be32 local = parms->iph.saddr; | |
3a43be3c | 137 | unsigned int h = 0; |
1da177e4 LT |
138 | int prio = 0; |
139 | ||
140 | if (remote) { | |
141 | prio |= 2; | |
142 | h ^= HASH(remote); | |
143 | } | |
144 | if (local) { | |
145 | prio |= 1; | |
146 | h ^= HASH(local); | |
147 | } | |
29182176 | 148 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
149 | } |
150 | ||
3a43be3c | 151 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 152 | struct ip_tunnel *t) |
420fe234 | 153 | { |
ca8def14 | 154 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
155 | } |
156 | ||
ca8def14 | 157 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 158 | { |
3a43be3c ED |
159 | struct ip_tunnel __rcu **tp; |
160 | struct ip_tunnel *iter; | |
161 | ||
162 | for (tp = ipip6_bucket(sitn, t); | |
163 | (iter = rtnl_dereference(*tp)) != NULL; | |
164 | tp = &iter->next) { | |
165 | if (t == iter) { | |
cf778b00 | 166 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
167 | break; |
168 | } | |
169 | } | |
170 | } | |
171 | ||
ca8def14 | 172 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 173 | { |
3a43be3c | 174 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 175 | |
cf778b00 ED |
176 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
177 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
178 | } |
179 | ||
e0c93948 | 180 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
181 | { |
182 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
183 | struct ip_tunnel *t = netdev_priv(dev); |
184 | ||
fa857afc YH |
185 | if (t->dev == sitn->fb_tunnel_dev) { |
186 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
187 | t->ip6rd.relay_prefix = 0; | |
188 | t->ip6rd.prefixlen = 16; | |
189 | t->ip6rd.relay_prefixlen = 0; | |
190 | } else { | |
191 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
192 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
193 | } | |
194 | #endif | |
195 | } | |
196 | ||
f3723416 ND |
197 | static int ipip6_tunnel_create(struct net_device *dev) |
198 | { | |
199 | struct ip_tunnel *t = netdev_priv(dev); | |
200 | struct net *net = dev_net(dev); | |
201 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
202 | int err; | |
203 | ||
ebe084aa SK |
204 | memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); |
205 | memcpy(dev->broadcast, &t->parms.iph.daddr, 4); | |
f3723416 | 206 | |
d440b720 | 207 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
208 | dev->priv_flags |= IFF_ISATAP; |
209 | ||
87e57399 TLSC |
210 | dev->rtnl_link_ops = &sit_link_ops; |
211 | ||
f3723416 ND |
212 | err = register_netdevice(dev); |
213 | if (err < 0) | |
214 | goto out; | |
215 | ||
ebe084aa SK |
216 | ipip6_tunnel_clone_6rd(dev, sitn); |
217 | ||
f3723416 ND |
218 | dev_hold(dev); |
219 | ||
220 | ipip6_tunnel_link(sitn, t); | |
221 | return 0; | |
222 | ||
223 | out: | |
224 | return err; | |
225 | } | |
226 | ||
3a43be3c | 227 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 228 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 229 | { |
e69a4adc AV |
230 | __be32 remote = parms->iph.daddr; |
231 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
232 | struct ip_tunnel *t, *nt; |
233 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 234 | struct net_device *dev; |
1da177e4 | 235 | char name[IFNAMSIZ]; |
ca8def14 | 236 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 237 | |
3a43be3c ED |
238 | for (tp = __ipip6_bucket(sitn, parms); |
239 | (t = rtnl_dereference(*tp)) != NULL; | |
240 | tp = &t->next) { | |
8db99e57 | 241 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
242 | remote == t->parms.iph.daddr && |
243 | parms->link == t->parms.link) { | |
8db99e57 SH |
244 | if (create) |
245 | return NULL; | |
246 | else | |
247 | return t; | |
248 | } | |
1da177e4 LT |
249 | } |
250 | if (!create) | |
251 | goto failed; | |
252 | ||
253 | if (parms->name[0]) | |
254 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 255 | else |
15fc1f70 | 256 | strcpy(name, "sit%d"); |
1da177e4 | 257 | |
c835a677 TG |
258 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
259 | ipip6_tunnel_setup); | |
63159f29 | 260 | if (!dev) |
1da177e4 LT |
261 | return NULL; |
262 | ||
7a97146c PE |
263 | dev_net_set(dev, net); |
264 | ||
2941a486 | 265 | nt = netdev_priv(dev); |
1326c3d5 | 266 | |
1da177e4 | 267 | nt->parms = *parms; |
f3723416 | 268 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 269 | goto failed_free; |
1da177e4 | 270 | |
1da177e4 LT |
271 | return nt; |
272 | ||
b37d428b | 273 | failed_free: |
cf124db5 | 274 | free_netdev(dev); |
1da177e4 LT |
275 | failed: |
276 | return NULL; | |
277 | } | |
278 | ||
ef9a9d11 ED |
279 | #define for_each_prl_rcu(start) \ |
280 | for (prl = rcu_dereference(start); \ | |
281 | prl; \ | |
282 | prl = rcu_dereference(prl->next)) | |
283 | ||
fadf6bf0 | 284 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 285 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 286 | { |
ef9a9d11 | 287 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 288 | |
ef9a9d11 ED |
289 | for_each_prl_rcu(t->prl) |
290 | if (prl->addr == addr) | |
fadf6bf0 | 291 | break; |
ef9a9d11 | 292 | return prl; |
fadf6bf0 TF |
293 | |
294 | } | |
295 | ||
2b4743bd YH |
296 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
297 | struct ip_tunnel_prl __user *a) | |
300aaeea | 298 | { |
2b4743bd | 299 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
300 | struct ip_tunnel_prl_entry *prl; |
301 | unsigned int cmax, c = 0, ca, len; | |
302 | int ret = 0; | |
303 | ||
2b4743bd YH |
304 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
305 | return -EFAULT; | |
306 | cmax = kprl.datalen / sizeof(kprl); | |
307 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
308 | cmax = 1; |
309 | ||
310 | /* For simple GET or for root users, | |
311 | * we try harder to allocate. | |
312 | */ | |
313 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
0ccc22f4 | 314 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
300aaeea YH |
315 | NULL; |
316 | ||
ef9a9d11 | 317 | rcu_read_lock(); |
300aaeea YH |
318 | |
319 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
320 | ||
321 | if (!kp) { | |
322 | /* We don't try hard to allocate much memory for | |
323 | * non-root users. | |
324 | * For root users, retry allocating enough memory for | |
325 | * the answer. | |
326 | */ | |
327 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
328 | if (!kp) { | |
329 | ret = -ENOMEM; | |
330 | goto out; | |
331 | } | |
332 | } | |
333 | ||
334 | c = 0; | |
ef9a9d11 | 335 | for_each_prl_rcu(t->prl) { |
298bf12d | 336 | if (c >= cmax) |
300aaeea | 337 | break; |
2b4743bd | 338 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
339 | continue; |
340 | kp[c].addr = prl->addr; | |
341 | kp[c].flags = prl->flags; | |
342 | c++; | |
2b4743bd | 343 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
344 | break; |
345 | } | |
346 | out: | |
ef9a9d11 | 347 | rcu_read_unlock(); |
300aaeea YH |
348 | |
349 | len = sizeof(*kp) * c; | |
2b4743bd YH |
350 | ret = 0; |
351 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
352 | ret = -EFAULT; | |
300aaeea YH |
353 | |
354 | kfree(kp); | |
300aaeea | 355 | |
2b4743bd | 356 | return ret; |
300aaeea YH |
357 | } |
358 | ||
fadf6bf0 TF |
359 | static int |
360 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
361 | { | |
362 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
363 | int err = 0; |
364 | ||
0009ae1f YH |
365 | if (a->addr == htonl(INADDR_ANY)) |
366 | return -EINVAL; | |
367 | ||
aac4dddc | 368 | ASSERT_RTNL(); |
fadf6bf0 | 369 | |
3a43be3c | 370 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 371 | if (p->addr == a->addr) { |
ef9a9d11 ED |
372 | if (chg) { |
373 | p->flags = a->flags; | |
374 | goto out; | |
375 | } | |
3fcfa129 YH |
376 | err = -EEXIST; |
377 | goto out; | |
fadf6bf0 TF |
378 | } |
379 | } | |
380 | ||
3fcfa129 YH |
381 | if (chg) { |
382 | err = -ENXIO; | |
383 | goto out; | |
384 | } | |
fadf6bf0 TF |
385 | |
386 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
387 | if (!p) { |
388 | err = -ENOBUFS; | |
389 | goto out; | |
390 | } | |
fadf6bf0 | 391 | |
fadf6bf0 | 392 | p->next = t->prl; |
300aaeea YH |
393 | p->addr = a->addr; |
394 | p->flags = a->flags; | |
ef9a9d11 | 395 | t->prl_count++; |
cf778b00 | 396 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 397 | out: |
3fcfa129 | 398 | return err; |
fadf6bf0 TF |
399 | } |
400 | ||
ef9a9d11 ED |
401 | static void prl_list_destroy_rcu(struct rcu_head *head) |
402 | { | |
403 | struct ip_tunnel_prl_entry *p, *n; | |
404 | ||
405 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
406 | do { | |
753ea8e9 | 407 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
408 | kfree(p); |
409 | p = n; | |
410 | } while (p); | |
411 | } | |
412 | ||
fadf6bf0 TF |
413 | static int |
414 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
415 | { | |
753ea8e9 ED |
416 | struct ip_tunnel_prl_entry *x; |
417 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
418 | int err = 0; |
419 | ||
aac4dddc | 420 | ASSERT_RTNL(); |
fadf6bf0 | 421 | |
0009ae1f | 422 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
423 | for (p = &t->prl; |
424 | (x = rtnl_dereference(*p)) != NULL; | |
425 | p = &x->next) { | |
426 | if (x->addr == a->addr) { | |
fadf6bf0 | 427 | *p = x->next; |
11c476f3 | 428 | kfree_rcu(x, rcu_head); |
300aaeea | 429 | t->prl_count--; |
3fcfa129 | 430 | goto out; |
fadf6bf0 TF |
431 | } |
432 | } | |
3fcfa129 | 433 | err = -ENXIO; |
fadf6bf0 | 434 | } else { |
753ea8e9 ED |
435 | x = rtnl_dereference(t->prl); |
436 | if (x) { | |
ef9a9d11 | 437 | t->prl_count = 0; |
ef9a9d11 ED |
438 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
439 | t->prl = NULL; | |
fadf6bf0 TF |
440 | } |
441 | } | |
3fcfa129 | 442 | out: |
4b279601 | 443 | return err; |
fadf6bf0 TF |
444 | } |
445 | ||
fadf6bf0 | 446 | static int |
b71d1d42 | 447 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 448 | { |
3fcfa129 | 449 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
450 | int ok = 1; |
451 | ||
ef9a9d11 | 452 | rcu_read_lock(); |
3fcfa129 | 453 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 454 | if (p) { |
300aaeea | 455 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
456 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
457 | else | |
458 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
459 | } else { | |
b71d1d42 ED |
460 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
461 | ||
fadf6bf0 TF |
462 | if (ipv6_addr_is_isatap(addr6) && |
463 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 464 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
465 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
466 | else | |
467 | ok = 0; | |
468 | } | |
ef9a9d11 | 469 | rcu_read_unlock(); |
fadf6bf0 TF |
470 | return ok; |
471 | } | |
472 | ||
1da177e4 LT |
473 | static void ipip6_tunnel_uninit(struct net_device *dev) |
474 | { | |
5e6700b3 ND |
475 | struct ip_tunnel *tunnel = netdev_priv(dev); |
476 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 477 | |
cd3dbc19 | 478 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 479 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 480 | } else { |
5e6700b3 ND |
481 | ipip6_tunnel_unlink(sitn, tunnel); |
482 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 483 | } |
e09acddf | 484 | dst_cache_reset(&tunnel->dst_cache); |
3a43be3c | 485 | dev_put(dev); |
1da177e4 LT |
486 | } |
487 | ||
c73cb5a2 | 488 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 489 | { |
b71d1d42 | 490 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
491 | const int type = icmp_hdr(skb)->type; |
492 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 493 | unsigned int data_len = 0; |
1da177e4 | 494 | struct ip_tunnel *t; |
3051fbec | 495 | int sifindex; |
c73cb5a2 | 496 | int err; |
1da177e4 LT |
497 | |
498 | switch (type) { | |
499 | default: | |
500 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 501 | return 0; |
1da177e4 LT |
502 | |
503 | case ICMP_DEST_UNREACH: | |
504 | switch (code) { | |
505 | case ICMP_SR_FAILED: | |
1da177e4 | 506 | /* Impossible event. */ |
c73cb5a2 | 507 | return 0; |
1da177e4 LT |
508 | default: |
509 | /* All others are translated to HOST_UNREACH. | |
510 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
511 | I believe they are just ether pollution. --ANK | |
512 | */ | |
513 | break; | |
514 | } | |
515 | break; | |
516 | case ICMP_TIME_EXCEEDED: | |
517 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 518 | return 0; |
20e1954f | 519 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 520 | break; |
ec18d9a2 DM |
521 | case ICMP_REDIRECT: |
522 | break; | |
1da177e4 LT |
523 | } |
524 | ||
c73cb5a2 KM |
525 | err = -ENOENT; |
526 | ||
3051fbec DA |
527 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
528 | t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
529 | iph->daddr, iph->saddr, sifindex); | |
63159f29 | 530 | if (!t) |
36393395 DM |
531 | goto out; |
532 | ||
533 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
534 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d5d8760b | 535 | t->parms.link, 0, iph->protocol, 0); |
36393395 DM |
536 | err = 0; |
537 | goto out; | |
538 | } | |
ec18d9a2 | 539 | if (type == ICMP_REDIRECT) { |
2346829e | 540 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, |
d5d8760b | 541 | iph->protocol, 0); |
ec18d9a2 DM |
542 | err = 0; |
543 | goto out; | |
544 | } | |
36393395 | 545 | |
2d7a3b27 | 546 | err = 0; |
20e1954f | 547 | if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) |
1da177e4 | 548 | goto out; |
c73cb5a2 | 549 | |
2d7a3b27 | 550 | if (t->parms.iph.daddr == 0) |
ca15a078 OG |
551 | goto out; |
552 | ||
1da177e4 LT |
553 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
554 | goto out; | |
555 | ||
bb80087a | 556 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
557 | t->err_count++; |
558 | else | |
559 | t->err_count = 1; | |
560 | t->err_time = jiffies; | |
561 | out: | |
c73cb5a2 | 562 | return err; |
1da177e4 LT |
563 | } |
564 | ||
218774dc HFS |
565 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
566 | const struct in6_addr *v6addr) | |
567 | { | |
568 | __be32 v4embed = 0; | |
569 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
570 | return true; | |
571 | return false; | |
572 | } | |
573 | ||
7df37ff3 CB |
574 | /* Checks if an address matches an address on the tunnel interface. |
575 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
576 | * Long story: | |
577 | * This function is called after we considered the packet as spoofed | |
578 | * in is_spoofed_6rd. | |
579 | * We may have a router that is doing NAT for proto 41 packets | |
580 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
581 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
582 | * function will return true, dropping the packet. | |
583 | * But, we can still check if is spoofed against the IP | |
584 | * addresses associated with the interface. | |
585 | */ | |
586 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
587 | const struct in6_addr *v6dst) | |
588 | { | |
589 | int prefix_len; | |
590 | ||
591 | #ifdef CONFIG_IPV6_SIT_6RD | |
592 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
593 | - tunnel->ip6rd.relay_prefixlen; | |
594 | #else | |
595 | prefix_len = 48; | |
596 | #endif | |
597 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
598 | } | |
599 | ||
600 | /* Returns true if a packet is spoofed */ | |
601 | static bool packet_is_spoofed(struct sk_buff *skb, | |
602 | const struct iphdr *iph, | |
603 | struct ip_tunnel *tunnel) | |
604 | { | |
605 | const struct ipv6hdr *ipv6h; | |
606 | ||
607 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
608 | if (!isatap_chksrc(skb, iph, tunnel)) | |
609 | return true; | |
610 | ||
611 | return false; | |
612 | } | |
613 | ||
614 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
615 | return false; | |
616 | ||
617 | ipv6h = ipv6_hdr(skb); | |
618 | ||
619 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
620 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
621 | &iph->saddr, &ipv6h->saddr, | |
622 | &iph->daddr, &ipv6h->daddr); | |
623 | return true; | |
624 | } | |
625 | ||
626 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
627 | return false; | |
628 | ||
629 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
630 | return false; | |
631 | ||
632 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
633 | &iph->saddr, &ipv6h->saddr, | |
634 | &iph->daddr, &ipv6h->daddr); | |
635 | return true; | |
636 | } | |
637 | ||
1da177e4 LT |
638 | static int ipip6_rcv(struct sk_buff *skb) |
639 | { | |
1ad759d8 | 640 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 641 | struct ip_tunnel *tunnel; |
3051fbec | 642 | int sifindex; |
f4e0b4c5 | 643 | int err; |
1da177e4 | 644 | |
3051fbec | 645 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
4fddbf5d | 646 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 647 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 648 | if (tunnel) { |
8f84985f | 649 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 650 | |
32b8a8e5 ND |
651 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
652 | tunnel->parms.iph.protocol != 0) | |
653 | goto out; | |
654 | ||
b0e380b1 | 655 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 656 | skb_reset_network_header(skb); |
8cdfab8a | 657 | IPCB(skb)->flags = 0; |
a09a4c8d | 658 | skb->dev = tunnel->dev; |
c7dc89c0 | 659 | |
7df37ff3 CB |
660 | if (packet_is_spoofed(skb, iph, tunnel)) { |
661 | tunnel->dev->stats.rx_errors++; | |
662 | goto out; | |
f4e0b4c5 ND |
663 | } |
664 | ||
a09a4c8d JG |
665 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
666 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
667 | goto out; | |
f4e0b4c5 ND |
668 | |
669 | err = IP_ECN_decapsulate(iph, skb); | |
670 | if (unlikely(err)) { | |
671 | if (log_ecn_error) | |
672 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
673 | &iph->saddr, iph->tos); | |
674 | if (err > 1) { | |
675 | ++tunnel->dev->stats.rx_frame_errors; | |
676 | ++tunnel->dev->stats.rx_errors; | |
677 | goto out; | |
678 | } | |
c7dc89c0 | 679 | } |
d19d56dd | 680 | |
15fc1f70 | 681 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 682 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
683 | tstats->rx_packets++; |
684 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 685 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 686 | |
caf586e5 | 687 | netif_rx(skb); |
8990f468 | 688 | |
1da177e4 LT |
689 | return 0; |
690 | } | |
691 | ||
6dcdd1b3 | 692 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 693 | return 1; |
1da177e4 | 694 | out: |
36ca34cc | 695 | kfree_skb(skb); |
1da177e4 LT |
696 | return 0; |
697 | } | |
698 | ||
49dbe7ae | 699 | static const struct tnl_ptk_info ipip_tpi = { |
32b8a8e5 ND |
700 | /* no tunnel info required for ipip. */ |
701 | .proto = htons(ETH_P_IP), | |
702 | }; | |
703 | ||
49dbe7ae SH |
704 | #if IS_ENABLED(CONFIG_MPLS) |
705 | static const struct tnl_ptk_info mplsip_tpi = { | |
706 | /* no tunnel info required for mplsip. */ | |
707 | .proto = htons(ETH_P_MPLS_UC), | |
708 | }; | |
709 | #endif | |
710 | ||
711 | static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
32b8a8e5 | 712 | { |
3d7b46cd | 713 | const struct iphdr *iph; |
32b8a8e5 | 714 | struct ip_tunnel *tunnel; |
3051fbec DA |
715 | int sifindex; |
716 | ||
717 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; | |
32b8a8e5 | 718 | |
3d7b46cd | 719 | iph = ip_hdr(skb); |
32b8a8e5 | 720 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 721 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 722 | if (tunnel) { |
49dbe7ae SH |
723 | const struct tnl_ptk_info *tpi; |
724 | ||
725 | if (tunnel->parms.iph.protocol != ipproto && | |
32b8a8e5 ND |
726 | tunnel->parms.iph.protocol != 0) |
727 | goto drop; | |
728 | ||
729 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
730 | goto drop; | |
49dbe7ae SH |
731 | #if IS_ENABLED(CONFIG_MPLS) |
732 | if (ipproto == IPPROTO_MPLS) | |
733 | tpi = &mplsip_tpi; | |
734 | else | |
735 | #endif | |
736 | tpi = &ipip_tpi; | |
737 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 738 | goto drop; |
49dbe7ae | 739 | return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
32b8a8e5 ND |
740 | } |
741 | ||
742 | return 1; | |
743 | ||
744 | drop: | |
745 | kfree_skb(skb); | |
746 | return 0; | |
747 | } | |
748 | ||
49dbe7ae SH |
749 | static int ipip_rcv(struct sk_buff *skb) |
750 | { | |
751 | return sit_tunnel_rcv(skb, IPPROTO_IPIP); | |
752 | } | |
753 | ||
754 | #if IS_ENABLED(CONFIG_MPLS) | |
755 | static int mplsip_rcv(struct sk_buff *skb) | |
756 | { | |
757 | return sit_tunnel_rcv(skb, IPPROTO_MPLS); | |
758 | } | |
759 | #endif | |
760 | ||
fa857afc | 761 | /* |
218774dc HFS |
762 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
763 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 764 | */ |
218774dc HFS |
765 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
766 | __be32 *v4dst) | |
1da177e4 | 767 | { |
fa857afc YH |
768 | #ifdef CONFIG_IPV6_SIT_6RD |
769 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
770 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 771 | unsigned int pbw0, pbi0; |
fa857afc YH |
772 | int pbi1; |
773 | u32 d; | |
774 | ||
775 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
776 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
777 | ||
e7db38c3 | 778 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
779 | tunnel->ip6rd.relay_prefixlen; |
780 | ||
781 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
782 | if (pbi1 > 0) | |
e7db38c3 | 783 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
784 | (32 - pbi1); |
785 | ||
218774dc HFS |
786 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
787 | return true; | |
fa857afc YH |
788 | } |
789 | #else | |
1da177e4 | 790 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 791 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
792 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
793 | return true; | |
1da177e4 | 794 | } |
fa857afc | 795 | #endif |
218774dc HFS |
796 | return false; |
797 | } | |
798 | ||
799 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
800 | const struct in6_addr *v6dst) | |
801 | { | |
802 | __be32 dst = 0; | |
803 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
804 | return dst; |
805 | } | |
806 | ||
807 | /* | |
808 | * This function assumes it is being called from dev_queue_xmit() | |
809 | * and that skb is filled properly by that function. | |
810 | */ | |
811 | ||
6fef4c0c SH |
812 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
813 | struct net_device *dev) | |
1da177e4 | 814 | { |
2941a486 | 815 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
816 | const struct iphdr *tiph = &tunnel->parms.iph; |
817 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 818 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 819 | __be16 df = tiph->frag_off; |
67ba4152 IM |
820 | struct rtable *rt; /* Route to the other host */ |
821 | struct net_device *tdev; /* Device to other host */ | |
822 | unsigned int max_headroom; /* The extra header space needed */ | |
e69a4adc | 823 | __be32 dst = tiph->daddr; |
31e4543d | 824 | struct flowi4 fl4; |
1da177e4 | 825 | int mtu; |
b71d1d42 | 826 | const struct in6_addr *addr6; |
1da177e4 | 827 | int addr_type; |
0e6fbc5b | 828 | u8 ttl; |
14909664 TH |
829 | u8 protocol = IPPROTO_IPV6; |
830 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1da177e4 | 831 | |
c2bceb3d LEM |
832 | if (tos == 1) |
833 | tos = ipv6_get_dsfield(iph6); | |
834 | ||
c7dc89c0 FT |
835 | /* ISATAP (RFC4214) - must come before 6to4 */ |
836 | if (dev->priv_flags & IFF_ISATAP) { | |
837 | struct neighbour *neigh = NULL; | |
1e2927b0 | 838 | bool do_tx_error = false; |
c7dc89c0 | 839 | |
adf30907 | 840 | if (skb_dst(skb)) |
1e2927b0 | 841 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 | 842 | |
63159f29 | 843 | if (!neigh) { |
7df37ff3 | 844 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
845 | goto tx_error; |
846 | } | |
847 | ||
3e866703 | 848 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
849 | addr_type = ipv6_addr_type(addr6); |
850 | ||
851 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
852 | ipv6_addr_is_isatap(addr6)) | |
853 | dst = addr6->s6_addr32[3]; | |
854 | else | |
1e2927b0 DM |
855 | do_tx_error = true; |
856 | ||
857 | neigh_release(neigh); | |
858 | if (do_tx_error) | |
c7dc89c0 FT |
859 | goto tx_error; |
860 | } | |
861 | ||
1da177e4 | 862 | if (!dst) |
218774dc | 863 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
864 | |
865 | if (!dst) { | |
866 | struct neighbour *neigh = NULL; | |
1e2927b0 | 867 | bool do_tx_error = false; |
1da177e4 | 868 | |
adf30907 | 869 | if (skb_dst(skb)) |
1e2927b0 | 870 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 | 871 | |
63159f29 | 872 | if (!neigh) { |
7df37ff3 | 873 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
874 | goto tx_error; |
875 | } | |
876 | ||
3e866703 | 877 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
878 | addr_type = ipv6_addr_type(addr6); |
879 | ||
880 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 881 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
882 | addr_type = ipv6_addr_type(addr6); |
883 | } | |
884 | ||
1e2927b0 DM |
885 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
886 | dst = addr6->s6_addr32[3]; | |
887 | else | |
888 | do_tx_error = true; | |
1da177e4 | 889 | |
1e2927b0 DM |
890 | neigh_release(neigh); |
891 | if (do_tx_error) | |
892 | goto tx_error; | |
1da177e4 LT |
893 | } |
894 | ||
9830ad4c CG |
895 | flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
896 | RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, | |
897 | 0, dst, tiph->saddr, 0, 0, | |
898 | sock_net_uid(tunnel->net, NULL)); | |
899 | rt = ip_route_output_flow(tunnel->net, &fl4, NULL); | |
900 | ||
78fbfd8a DM |
901 | if (IS_ERR(rt)) { |
902 | dev->stats.tx_carrier_errors++; | |
903 | goto tx_error_icmp; | |
1da177e4 LT |
904 | } |
905 | if (rt->rt_type != RTN_UNICAST) { | |
906 | ip_rt_put(rt); | |
15fc1f70 | 907 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
908 | goto tx_error_icmp; |
909 | } | |
d8d1f30b | 910 | tdev = rt->dst.dev; |
1da177e4 LT |
911 | |
912 | if (tdev == dev) { | |
913 | ip_rt_put(rt); | |
15fc1f70 | 914 | dev->stats.collisions++; |
1da177e4 LT |
915 | goto tx_error; |
916 | } | |
917 | ||
7e13318d | 918 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
14909664 | 919 | ip_rt_put(rt); |
aed069df | 920 | goto tx_error; |
14909664 TH |
921 | } |
922 | ||
292f4f3c | 923 | if (df) { |
14909664 | 924 | mtu = dst_mtu(&rt->dst) - t_hlen; |
1da177e4 | 925 | |
292f4f3c | 926 | if (mtu < 68) { |
15fc1f70 | 927 | dev->stats.collisions++; |
292f4f3c HX |
928 | ip_rt_put(rt); |
929 | goto tx_error; | |
930 | } | |
1da177e4 | 931 | |
292f4f3c HX |
932 | if (mtu < IPV6_MIN_MTU) { |
933 | mtu = IPV6_MIN_MTU; | |
934 | df = 0; | |
935 | } | |
936 | ||
937 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 938 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c | 939 | |
58a47824 | 940 | if (skb->len > mtu && !skb_is_gso(skb)) { |
3ffe533c | 941 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
942 | ip_rt_put(rt); |
943 | goto tx_error; | |
944 | } | |
1da177e4 LT |
945 | } |
946 | ||
947 | if (tunnel->err_count > 0) { | |
bb80087a WY |
948 | if (time_before(jiffies, |
949 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
950 | tunnel->err_count--; |
951 | dst_link_failure(skb); | |
952 | } else | |
953 | tunnel->err_count = 0; | |
954 | } | |
955 | ||
956 | /* | |
957 | * Okay, now see if we can stuff it in the buffer as-is. | |
958 | */ | |
14909664 | 959 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; |
1da177e4 | 960 | |
cfbba49d PM |
961 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
962 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
963 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
964 | if (!new_skb) { | |
965 | ip_rt_put(rt); | |
15fc1f70 | 966 | dev->stats.tx_dropped++; |
66028310 | 967 | kfree_skb(skb); |
6ed10654 | 968 | return NETDEV_TX_OK; |
1da177e4 LT |
969 | } |
970 | if (skb->sk) | |
971 | skb_set_owner_w(new_skb, skb->sk); | |
972 | dev_kfree_skb(skb); | |
973 | skb = new_skb; | |
0660e03f | 974 | iph6 = ipv6_hdr(skb); |
1da177e4 | 975 | } |
0e6fbc5b PS |
976 | ttl = tiph->ttl; |
977 | if (ttl == 0) | |
978 | ttl = iph6->hop_limit; | |
979 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 980 | |
14909664 | 981 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
6a9eadcc | 982 | ip_rt_put(rt); |
14909664 | 983 | goto tx_error; |
6a9eadcc | 984 | } |
3d483058 | 985 | |
469471cd TH |
986 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
987 | ||
039f5062 PS |
988 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
989 | df, !net_eq(tunnel->net, dev_net(dev))); | |
6ed10654 | 990 | return NETDEV_TX_OK; |
1da177e4 LT |
991 | |
992 | tx_error_icmp: | |
993 | dst_link_failure(skb); | |
994 | tx_error: | |
66028310 | 995 | kfree_skb(skb); |
61c1db7f | 996 | dev->stats.tx_errors++; |
6ed10654 | 997 | return NETDEV_TX_OK; |
1da177e4 LT |
998 | } |
999 | ||
49dbe7ae SH |
1000 | static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
1001 | struct net_device *dev, u8 ipproto) | |
32b8a8e5 ND |
1002 | { |
1003 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1004 | const struct iphdr *tiph = &tunnel->parms.iph; | |
1005 | ||
7e13318d | 1006 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 1007 | goto tx_error; |
32b8a8e5 | 1008 | |
49dbe7ae | 1009 | skb_set_inner_ipproto(skb, ipproto); |
469471cd | 1010 | |
49dbe7ae | 1011 | ip_tunnel_xmit(skb, dev, tiph, ipproto); |
32b8a8e5 | 1012 | return NETDEV_TX_OK; |
aed069df AD |
1013 | tx_error: |
1014 | kfree_skb(skb); | |
61c1db7f ED |
1015 | dev->stats.tx_errors++; |
1016 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1017 | } |
1018 | ||
1019 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1020 | struct net_device *dev) | |
1021 | { | |
1022 | switch (skb->protocol) { | |
1023 | case htons(ETH_P_IP): | |
49dbe7ae | 1024 | sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
32b8a8e5 ND |
1025 | break; |
1026 | case htons(ETH_P_IPV6): | |
1027 | ipip6_tunnel_xmit(skb, dev); | |
1028 | break; | |
49dbe7ae SH |
1029 | #if IS_ENABLED(CONFIG_MPLS) |
1030 | case htons(ETH_P_MPLS_UC): | |
1031 | sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); | |
1032 | break; | |
1033 | #endif | |
32b8a8e5 ND |
1034 | default: |
1035 | goto tx_err; | |
1036 | } | |
1037 | ||
1038 | return NETDEV_TX_OK; | |
1039 | ||
1040 | tx_err: | |
1041 | dev->stats.tx_errors++; | |
66028310 | 1042 | kfree_skb(skb); |
32b8a8e5 ND |
1043 | return NETDEV_TX_OK; |
1044 | ||
1045 | } | |
1046 | ||
8a4a50f9 MS |
1047 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1048 | { | |
1049 | struct net_device *tdev = NULL; | |
1050 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1051 | const struct iphdr *iph; |
31e4543d | 1052 | struct flowi4 fl4; |
8a4a50f9 MS |
1053 | |
1054 | tunnel = netdev_priv(dev); | |
1055 | iph = &tunnel->parms.iph; | |
1056 | ||
1057 | if (iph->daddr) { | |
5e6700b3 ND |
1058 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1059 | NULL, | |
78fbfd8a DM |
1060 | iph->daddr, iph->saddr, |
1061 | 0, 0, | |
1062 | IPPROTO_IPV6, | |
1063 | RT_TOS(iph->tos), | |
1064 | tunnel->parms.link); | |
b23dd4fe DM |
1065 | |
1066 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1067 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1068 | ip_rt_put(rt); |
1069 | } | |
1070 | dev->flags |= IFF_POINTOPOINT; | |
1071 | } | |
1072 | ||
1073 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1074 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 MS |
1075 | |
1076 | if (tdev) { | |
14909664 TH |
1077 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1078 | ||
8a4a50f9 | 1079 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
14909664 | 1080 | dev->mtu = tdev->mtu - t_hlen; |
8a4a50f9 MS |
1081 | if (dev->mtu < IPV6_MIN_MTU) |
1082 | dev->mtu = IPV6_MIN_MTU; | |
1083 | } | |
8a4a50f9 MS |
1084 | } |
1085 | ||
9830ad4c CG |
1086 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
1087 | __u32 fwmark) | |
f3723416 | 1088 | { |
5e6700b3 | 1089 | struct net *net = t->net; |
f3723416 ND |
1090 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1091 | ||
1092 | ipip6_tunnel_unlink(sitn, t); | |
1093 | synchronize_net(); | |
1094 | t->parms.iph.saddr = p->iph.saddr; | |
1095 | t->parms.iph.daddr = p->iph.daddr; | |
1096 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1097 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1098 | ipip6_tunnel_link(sitn, t); | |
1099 | t->parms.iph.ttl = p->iph.ttl; | |
1100 | t->parms.iph.tos = p->iph.tos; | |
f859b4af | 1101 | t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c | 1102 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
f3723416 | 1103 | t->parms.link = p->link; |
9830ad4c | 1104 | t->fwmark = fwmark; |
f3723416 ND |
1105 | ipip6_tunnel_bind_dev(t->dev); |
1106 | } | |
e09acddf | 1107 | dst_cache_reset(&t->dst_cache); |
f3723416 ND |
1108 | netdev_state_change(t->dev); |
1109 | } | |
1110 | ||
e2f1f072 ND |
1111 | #ifdef CONFIG_IPV6_SIT_6RD |
1112 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1113 | struct ip_tunnel_6rd *ip6rd) | |
1114 | { | |
1115 | struct in6_addr prefix; | |
1116 | __be32 relay_prefix; | |
1117 | ||
1118 | if (ip6rd->relay_prefixlen > 32 || | |
1119 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1120 | return -EINVAL; | |
1121 | ||
1122 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1123 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1124 | return -EINVAL; | |
1125 | if (ip6rd->relay_prefixlen) | |
1126 | relay_prefix = ip6rd->relay_prefix & | |
1127 | htonl(0xffffffffUL << | |
1128 | (32 - ip6rd->relay_prefixlen)); | |
1129 | else | |
1130 | relay_prefix = 0; | |
1131 | if (relay_prefix != ip6rd->relay_prefix) | |
1132 | return -EINVAL; | |
1133 | ||
1134 | t->ip6rd.prefix = prefix; | |
1135 | t->ip6rd.relay_prefix = relay_prefix; | |
1136 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1137 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
e09acddf | 1138 | dst_cache_reset(&t->dst_cache); |
e2f1f072 ND |
1139 | netdev_state_change(t->dev); |
1140 | return 0; | |
1141 | } | |
1142 | #endif | |
1143 | ||
03ff4979 | 1144 | static bool ipip6_valid_ip_proto(u8 ipproto) |
49dbe7ae SH |
1145 | { |
1146 | return ipproto == IPPROTO_IPV6 || | |
1147 | ipproto == IPPROTO_IPIP || | |
1148 | #if IS_ENABLED(CONFIG_MPLS) | |
1149 | ipproto == IPPROTO_MPLS || | |
1150 | #endif | |
1151 | ipproto == 0; | |
1152 | } | |
1153 | ||
1da177e4 | 1154 | static int |
67ba4152 | 1155 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1156 | { |
1157 | int err = 0; | |
1158 | struct ip_tunnel_parm p; | |
fadf6bf0 | 1159 | struct ip_tunnel_prl prl; |
9aad77c3 ND |
1160 | struct ip_tunnel *t = netdev_priv(dev); |
1161 | struct net *net = t->net; | |
ca8def14 | 1162 | struct sit_net *sitn = net_generic(net, sit_net_id); |
fa857afc YH |
1163 | #ifdef CONFIG_IPV6_SIT_6RD |
1164 | struct ip_tunnel_6rd ip6rd; | |
1165 | #endif | |
1da177e4 LT |
1166 | |
1167 | switch (cmd) { | |
1168 | case SIOCGETTUNNEL: | |
fa857afc YH |
1169 | #ifdef CONFIG_IPV6_SIT_6RD |
1170 | case SIOCGET6RD: | |
1171 | #endif | |
cd3dbc19 | 1172 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1173 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1174 | err = -EFAULT; | |
1175 | break; | |
1176 | } | |
ca8def14 | 1177 | t = ipip6_tunnel_locate(net, &p, 0); |
63159f29 | 1178 | if (!t) |
9aad77c3 | 1179 | t = netdev_priv(dev); |
1da177e4 | 1180 | } |
fa857afc YH |
1181 | |
1182 | err = -EFAULT; | |
1183 | if (cmd == SIOCGETTUNNEL) { | |
1184 | memcpy(&p, &t->parms, sizeof(p)); | |
1185 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1186 | sizeof(p))) | |
1187 | goto done; | |
1188 | #ifdef CONFIG_IPV6_SIT_6RD | |
1189 | } else { | |
4e3fd7a0 | 1190 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
1191 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
1192 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1193 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1194 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1195 | sizeof(ip6rd))) | |
1196 | goto done; | |
1197 | #endif | |
1198 | } | |
1199 | err = 0; | |
1da177e4 LT |
1200 | break; |
1201 | ||
1202 | case SIOCADDTUNNEL: | |
1203 | case SIOCCHGTUNNEL: | |
1204 | err = -EPERM; | |
af31f412 | 1205 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1206 | goto done; |
1207 | ||
1208 | err = -EFAULT; | |
1209 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1210 | goto done; | |
1211 | ||
1212 | err = -EINVAL; | |
49dbe7ae | 1213 | if (!ipip6_valid_ip_proto(p.iph.protocol)) |
32b8a8e5 ND |
1214 | goto done; |
1215 | if (p.iph.version != 4 || | |
1da177e4 LT |
1216 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
1217 | goto done; | |
1218 | if (p.iph.ttl) | |
1219 | p.iph.frag_off |= htons(IP_DF); | |
1220 | ||
ca8def14 | 1221 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1222 | |
cd3dbc19 | 1223 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
53b24b8f | 1224 | if (t) { |
1da177e4 LT |
1225 | if (t->dev != dev) { |
1226 | err = -EEXIST; | |
1227 | break; | |
1228 | } | |
1229 | } else { | |
1230 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1231 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1232 | err = -EINVAL; | |
1233 | break; | |
1234 | } | |
2941a486 | 1235 | t = netdev_priv(dev); |
1da177e4 | 1236 | } |
f9cd5a55 | 1237 | |
9830ad4c | 1238 | ipip6_tunnel_update(t, &p, t->fwmark); |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | if (t) { | |
1242 | err = 0; | |
1da177e4 LT |
1243 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1244 | err = -EFAULT; | |
1245 | } else | |
1246 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1247 | break; | |
1248 | ||
1249 | case SIOCDELTUNNEL: | |
1250 | err = -EPERM; | |
af31f412 | 1251 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1252 | goto done; |
1253 | ||
cd3dbc19 | 1254 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1255 | err = -EFAULT; |
1256 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1257 | goto done; | |
1258 | err = -ENOENT; | |
e5d08d71 | 1259 | t = ipip6_tunnel_locate(net, &p, 0); |
63159f29 | 1260 | if (!t) |
1da177e4 LT |
1261 | goto done; |
1262 | err = -EPERM; | |
cd3dbc19 | 1263 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1264 | goto done; |
1265 | dev = t->dev; | |
1266 | } | |
22f8cde5 SH |
1267 | unregister_netdevice(dev); |
1268 | err = 0; | |
1da177e4 LT |
1269 | break; |
1270 | ||
300aaeea | 1271 | case SIOCGETPRL: |
2b4743bd YH |
1272 | err = -EINVAL; |
1273 | if (dev == sitn->fb_tunnel_dev) | |
1274 | goto done; | |
2b4743bd YH |
1275 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); |
1276 | break; | |
1277 | ||
fadf6bf0 TF |
1278 | case SIOCADDPRL: |
1279 | case SIOCDELPRL: | |
1280 | case SIOCCHGPRL: | |
1281 | err = -EPERM; | |
af31f412 | 1282 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fadf6bf0 TF |
1283 | goto done; |
1284 | err = -EINVAL; | |
cd3dbc19 | 1285 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1286 | goto done; |
1287 | err = -EFAULT; | |
1288 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1289 | goto done; | |
fadf6bf0 | 1290 | |
300aaeea | 1291 | switch (cmd) { |
300aaeea | 1292 | case SIOCDELPRL: |
fadf6bf0 | 1293 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1294 | break; |
1295 | case SIOCADDPRL: | |
1296 | case SIOCCHGPRL: | |
fadf6bf0 | 1297 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1298 | break; |
1299 | } | |
e09acddf | 1300 | dst_cache_reset(&t->dst_cache); |
2b4743bd | 1301 | netdev_state_change(dev); |
fadf6bf0 TF |
1302 | break; |
1303 | ||
fa857afc YH |
1304 | #ifdef CONFIG_IPV6_SIT_6RD |
1305 | case SIOCADD6RD: | |
1306 | case SIOCCHG6RD: | |
1307 | case SIOCDEL6RD: | |
1308 | err = -EPERM; | |
af31f412 | 1309 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fa857afc YH |
1310 | goto done; |
1311 | ||
1312 | err = -EFAULT; | |
1313 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1314 | sizeof(ip6rd))) | |
1315 | goto done; | |
1316 | ||
fa857afc | 1317 | if (cmd != SIOCDEL6RD) { |
e2f1f072 ND |
1318 | err = ipip6_tunnel_update_6rd(t, &ip6rd); |
1319 | if (err < 0) | |
fa857afc | 1320 | goto done; |
fa857afc | 1321 | } else |
e0c93948 | 1322 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1323 | |
1324 | err = 0; | |
1325 | break; | |
1326 | #endif | |
1327 | ||
1da177e4 LT |
1328 | default: |
1329 | err = -EINVAL; | |
1330 | } | |
1331 | ||
1332 | done: | |
1333 | return err; | |
1334 | } | |
1335 | ||
1326c3d5 | 1336 | static const struct net_device_ops ipip6_netdev_ops = { |
ebe084aa | 1337 | .ndo_init = ipip6_tunnel_init, |
1326c3d5 | 1338 | .ndo_uninit = ipip6_tunnel_uninit, |
32b8a8e5 | 1339 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 | 1340 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
f61dd388 | 1341 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1e99584b | 1342 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1326c3d5 SH |
1343 | }; |
1344 | ||
15fc1f70 ED |
1345 | static void ipip6_dev_free(struct net_device *dev) |
1346 | { | |
cf71d2bc ND |
1347 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1348 | ||
e09acddf | 1349 | dst_cache_destroy(&tunnel->dst_cache); |
15fc1f70 | 1350 | free_percpu(dev->tstats); |
15fc1f70 ED |
1351 | } |
1352 | ||
61c1db7f ED |
1353 | #define SIT_FEATURES (NETIF_F_SG | \ |
1354 | NETIF_F_FRAGLIST | \ | |
1355 | NETIF_F_HIGHDMA | \ | |
1356 | NETIF_F_GSO_SOFTWARE | \ | |
1357 | NETIF_F_HW_CSUM) | |
1358 | ||
1da177e4 LT |
1359 | static void ipip6_tunnel_setup(struct net_device *dev) |
1360 | { | |
14909664 TH |
1361 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1362 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1363 | ||
1326c3d5 | 1364 | dev->netdev_ops = &ipip6_netdev_ops; |
cf124db5 DM |
1365 | dev->needs_free_netdev = true; |
1366 | dev->priv_destructor = ipip6_dev_free; | |
1da177e4 LT |
1367 | |
1368 | dev->type = ARPHRD_SIT; | |
14909664 TH |
1369 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
1370 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
b96f9afe JW |
1371 | dev->min_mtu = IPV6_MIN_MTU; |
1372 | dev->max_mtu = 0xFFF8 - t_hlen; | |
1da177e4 | 1373 | dev->flags = IFF_NOARP; |
02875878 | 1374 | netif_keep_dst(dev); |
1da177e4 | 1375 | dev->addr_len = 4; |
8df40d10 | 1376 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1377 | dev->features |= SIT_FEATURES; |
1378 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1379 | } |
1380 | ||
15fc1f70 | 1381 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1382 | { |
1326c3d5 | 1383 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e09acddf | 1384 | int err; |
1da177e4 LT |
1385 | |
1386 | tunnel->dev = dev; | |
5e6700b3 | 1387 | tunnel->net = dev_net(dev); |
ebe084aa | 1388 | strcpy(tunnel->parms.name, dev->name); |
1da177e4 | 1389 | |
8a4a50f9 | 1390 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1391 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1392 | if (!dev->tstats) |
1393 | return -ENOMEM; | |
1394 | ||
e09acddf PA |
1395 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1396 | if (err) { | |
cf71d2bc | 1397 | free_percpu(dev->tstats); |
d7426c69 | 1398 | dev->tstats = NULL; |
e09acddf | 1399 | return err; |
cf71d2bc ND |
1400 | } |
1401 | ||
15fc1f70 | 1402 | return 0; |
1da177e4 LT |
1403 | } |
1404 | ||
4ece9009 | 1405 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1406 | { |
2941a486 | 1407 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1408 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1409 | struct net *net = dev_net(dev); |
1410 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 | 1411 | |
1da177e4 LT |
1412 | iph->version = 4; |
1413 | iph->protocol = IPPROTO_IPV6; | |
1414 | iph->ihl = 5; | |
1415 | iph->ttl = 64; | |
1416 | ||
1417 | dev_hold(dev); | |
cf778b00 | 1418 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
1da177e4 LT |
1419 | } |
1420 | ||
a8b8a889 MS |
1421 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
1422 | struct netlink_ext_ack *extack) | |
32b8a8e5 ND |
1423 | { |
1424 | u8 proto; | |
1425 | ||
c2ff682a | 1426 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1427 | return 0; |
1428 | ||
1429 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
49dbe7ae | 1430 | if (!ipip6_valid_ip_proto(proto)) |
32b8a8e5 ND |
1431 | return -EINVAL; |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
f3723416 | 1436 | static void ipip6_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
1437 | struct ip_tunnel_parm *parms, |
1438 | __u32 *fwmark) | |
f3723416 ND |
1439 | { |
1440 | memset(parms, 0, sizeof(*parms)); | |
1441 | ||
1442 | parms->iph.version = 4; | |
1443 | parms->iph.protocol = IPPROTO_IPV6; | |
1444 | parms->iph.ihl = 5; | |
1445 | parms->iph.ttl = 64; | |
1446 | ||
1447 | if (!data) | |
1448 | return; | |
1449 | ||
1450 | if (data[IFLA_IPTUN_LINK]) | |
1451 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1452 | ||
1453 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1454 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1455 | |
1456 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1457 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1458 | |
1459 | if (data[IFLA_IPTUN_TTL]) { | |
1460 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1461 | if (parms->iph.ttl) | |
1462 | parms->iph.frag_off = htons(IP_DF); | |
1463 | } | |
1464 | ||
1465 | if (data[IFLA_IPTUN_TOS]) | |
1466 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1467 | ||
1468 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1469 | parms->iph.frag_off = htons(IP_DF); | |
1470 | ||
1471 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1472 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1473 | |
1474 | if (data[IFLA_IPTUN_PROTO]) | |
1475 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1476 | ||
9830ad4c CG |
1477 | if (data[IFLA_IPTUN_FWMARK]) |
1478 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
f3723416 ND |
1479 | } |
1480 | ||
14909664 TH |
1481 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1482 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1483 | struct ip_tunnel_encap *ipencap) | |
1484 | { | |
1485 | bool ret = false; | |
1486 | ||
1487 | memset(ipencap, 0, sizeof(*ipencap)); | |
1488 | ||
1489 | if (!data) | |
1490 | return ret; | |
1491 | ||
1492 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1493 | ret = true; | |
1494 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1495 | } | |
1496 | ||
1497 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1498 | ret = true; | |
1499 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1500 | } | |
1501 | ||
1502 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1503 | ret = true; | |
a409caec | 1504 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
14909664 TH |
1505 | } |
1506 | ||
1507 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1508 | ret = true; | |
a409caec | 1509 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
14909664 TH |
1510 | } |
1511 | ||
1512 | return ret; | |
1513 | } | |
1514 | ||
e2f1f072 ND |
1515 | #ifdef CONFIG_IPV6_SIT_6RD |
1516 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1517 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1518 | struct ip_tunnel_6rd *ip6rd) | |
1519 | { | |
1520 | bool ret = false; | |
1521 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1522 | ||
1523 | if (!data) | |
1524 | return ret; | |
1525 | ||
1526 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1527 | ret = true; | |
67b61f6c | 1528 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
e2f1f072 ND |
1529 | } |
1530 | ||
1531 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1532 | ret = true; | |
1533 | ip6rd->relay_prefix = | |
1534 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1535 | } | |
1536 | ||
1537 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1538 | ret = true; | |
1539 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1540 | } | |
1541 | ||
1542 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1543 | ret = true; | |
1544 | ip6rd->relay_prefixlen = | |
1545 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1546 | } | |
1547 | ||
1548 | return ret; | |
1549 | } | |
1550 | #endif | |
1551 | ||
f3723416 | 1552 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1553 | struct nlattr *tb[], struct nlattr *data[], |
1554 | struct netlink_ext_ack *extack) | |
f3723416 ND |
1555 | { |
1556 | struct net *net = dev_net(dev); | |
1557 | struct ip_tunnel *nt; | |
14909664 | 1558 | struct ip_tunnel_encap ipencap; |
e2f1f072 ND |
1559 | #ifdef CONFIG_IPV6_SIT_6RD |
1560 | struct ip_tunnel_6rd ip6rd; | |
1561 | #endif | |
1562 | int err; | |
f3723416 ND |
1563 | |
1564 | nt = netdev_priv(dev); | |
14909664 TH |
1565 | |
1566 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1567 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1568 | if (err < 0) | |
1569 | return err; | |
1570 | } | |
1571 | ||
9830ad4c | 1572 | ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
f3723416 ND |
1573 | |
1574 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1575 | return -EEXIST; | |
1576 | ||
e2f1f072 ND |
1577 | err = ipip6_tunnel_create(dev); |
1578 | if (err < 0) | |
1579 | return err; | |
1580 | ||
1581 | #ifdef CONFIG_IPV6_SIT_6RD | |
1582 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1583 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1584 | #endif | |
1585 | ||
1586 | return err; | |
f3723416 ND |
1587 | } |
1588 | ||
1589 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
1590 | struct nlattr *data[], |
1591 | struct netlink_ext_ack *extack) | |
f3723416 | 1592 | { |
86bd68bf | 1593 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1594 | struct ip_tunnel_parm p; |
14909664 | 1595 | struct ip_tunnel_encap ipencap; |
86bd68bf | 1596 | struct net *net = t->net; |
f3723416 | 1597 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1598 | #ifdef CONFIG_IPV6_SIT_6RD |
1599 | struct ip_tunnel_6rd ip6rd; | |
1600 | #endif | |
9830ad4c | 1601 | __u32 fwmark = t->fwmark; |
14909664 | 1602 | int err; |
f3723416 ND |
1603 | |
1604 | if (dev == sitn->fb_tunnel_dev) | |
1605 | return -EINVAL; | |
1606 | ||
14909664 TH |
1607 | if (ipip6_netlink_encap_parms(data, &ipencap)) { |
1608 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1609 | if (err < 0) | |
1610 | return err; | |
1611 | } | |
1612 | ||
9830ad4c | 1613 | ipip6_netlink_parms(data, &p, &fwmark); |
f3723416 ND |
1614 | |
1615 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1616 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1617 | return -EINVAL; | |
1618 | ||
1619 | t = ipip6_tunnel_locate(net, &p, 0); | |
1620 | ||
1621 | if (t) { | |
1622 | if (t->dev != dev) | |
1623 | return -EEXIST; | |
1624 | } else | |
1625 | t = netdev_priv(dev); | |
1626 | ||
9830ad4c | 1627 | ipip6_tunnel_update(t, &p, fwmark); |
e2f1f072 ND |
1628 | |
1629 | #ifdef CONFIG_IPV6_SIT_6RD | |
1630 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1631 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1632 | #endif | |
1633 | ||
f3723416 ND |
1634 | return 0; |
1635 | } | |
1636 | ||
e4c94a9c | 1637 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1638 | { |
1639 | return | |
1640 | /* IFLA_IPTUN_LINK */ | |
1641 | nla_total_size(4) + | |
1642 | /* IFLA_IPTUN_LOCAL */ | |
1643 | nla_total_size(4) + | |
1644 | /* IFLA_IPTUN_REMOTE */ | |
1645 | nla_total_size(4) + | |
1646 | /* IFLA_IPTUN_TTL */ | |
1647 | nla_total_size(1) + | |
1648 | /* IFLA_IPTUN_TOS */ | |
1649 | nla_total_size(1) + | |
a12c9a85 ND |
1650 | /* IFLA_IPTUN_PMTUDISC */ |
1651 | nla_total_size(1) + | |
1652 | /* IFLA_IPTUN_FLAGS */ | |
1653 | nla_total_size(2) + | |
32b8a8e5 ND |
1654 | /* IFLA_IPTUN_PROTO */ |
1655 | nla_total_size(1) + | |
e2f1f072 ND |
1656 | #ifdef CONFIG_IPV6_SIT_6RD |
1657 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1658 | nla_total_size(sizeof(struct in6_addr)) + | |
1659 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1660 | nla_total_size(4) + | |
1661 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1662 | nla_total_size(2) + | |
1663 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1664 | nla_total_size(2) + | |
1665 | #endif | |
14909664 TH |
1666 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1667 | nla_total_size(2) + | |
1668 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1669 | nla_total_size(2) + | |
1670 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1671 | nla_total_size(2) + | |
1672 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1673 | nla_total_size(2) + | |
9830ad4c CG |
1674 | /* IFLA_IPTUN_FWMARK */ |
1675 | nla_total_size(4) + | |
ba3e3f50 ND |
1676 | 0; |
1677 | } | |
1678 | ||
e4c94a9c | 1679 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1680 | { |
1681 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1682 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1683 | ||
1684 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1685 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
1686 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
ba3e3f50 | 1687 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
a12c9a85 ND |
1688 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1689 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1690 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1691 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
9830ad4c CG |
1692 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
1693 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
ba3e3f50 | 1694 | goto nla_put_failure; |
e2f1f072 ND |
1695 | |
1696 | #ifdef CONFIG_IPV6_SIT_6RD | |
930345ea JB |
1697 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
1698 | &tunnel->ip6rd.prefix) || | |
1699 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1700 | tunnel->ip6rd.relay_prefix) || | |
e2f1f072 ND |
1701 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
1702 | tunnel->ip6rd.prefixlen) || | |
1703 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1704 | tunnel->ip6rd.relay_prefixlen)) | |
1705 | goto nla_put_failure; | |
1706 | #endif | |
1707 | ||
14909664 TH |
1708 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
1709 | tunnel->encap.type) || | |
a409caec | 1710 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
14909664 | 1711 | tunnel->encap.sport) || |
a409caec | 1712 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
14909664 TH |
1713 | tunnel->encap.dport) || |
1714 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
e1b2cb65 | 1715 | tunnel->encap.flags)) |
14909664 TH |
1716 | goto nla_put_failure; |
1717 | ||
ba3e3f50 ND |
1718 | return 0; |
1719 | ||
1720 | nla_put_failure: | |
1721 | return -EMSGSIZE; | |
1722 | } | |
1723 | ||
f3723416 ND |
1724 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1725 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1726 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1727 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1728 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1729 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1730 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1731 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1732 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1733 | #ifdef CONFIG_IPV6_SIT_6RD |
1734 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1735 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1736 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1737 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1738 | #endif | |
14909664 TH |
1739 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1740 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1741 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1742 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
9830ad4c | 1743 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
f3723416 ND |
1744 | }; |
1745 | ||
9434266f WB |
1746 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1747 | { | |
1748 | struct net *net = dev_net(dev); | |
1749 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1750 | ||
1751 | if (dev != sitn->fb_tunnel_dev) | |
1752 | unregister_netdevice_queue(dev, head); | |
1753 | } | |
1754 | ||
ba3e3f50 ND |
1755 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1756 | .kind = "sit", | |
1757 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1758 | .policy = ipip6_policy, |
ba3e3f50 | 1759 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1760 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1761 | .validate = ipip6_validate, |
f3723416 ND |
1762 | .newlink = ipip6_newlink, |
1763 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1764 | .get_size = ipip6_get_size, |
1765 | .fill_info = ipip6_fill_info, | |
9434266f | 1766 | .dellink = ipip6_dellink, |
1728d4fa | 1767 | .get_link_net = ip_tunnel_get_link_net, |
ba3e3f50 ND |
1768 | }; |
1769 | ||
6dcd814b | 1770 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1771 | .handler = ipip6_rcv, |
1772 | .err_handler = ipip6_err, | |
c73cb5a2 | 1773 | .priority = 1, |
1da177e4 LT |
1774 | }; |
1775 | ||
32b8a8e5 ND |
1776 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1777 | .handler = ipip_rcv, | |
1778 | .err_handler = ipip6_err, | |
1779 | .priority = 2, | |
1780 | }; | |
1781 | ||
49dbe7ae SH |
1782 | #if IS_ENABLED(CONFIG_MPLS) |
1783 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
1784 | .handler = mplsip_rcv, | |
1785 | .err_handler = ipip6_err, | |
1786 | .priority = 2, | |
1787 | }; | |
1788 | #endif | |
1789 | ||
9434266f WB |
1790 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1791 | struct list_head *head) | |
db44575f | 1792 | { |
9434266f | 1793 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1794 | struct net_device *dev, *aux; |
db44575f AK |
1795 | int prio; |
1796 | ||
5e6700b3 ND |
1797 | for_each_netdev_safe(net, dev, aux) |
1798 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1799 | unregister_netdevice_queue(dev, head); | |
1800 | ||
db44575f AK |
1801 | for (prio = 1; prio < 4; prio++) { |
1802 | int h; | |
e87a8f24 | 1803 | for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { |
753ea8e9 | 1804 | struct ip_tunnel *t; |
62808f91 | 1805 | |
753ea8e9 | 1806 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
53b24b8f | 1807 | while (t) { |
5e6700b3 ND |
1808 | /* If dev is in the same netns, it has already |
1809 | * been added to the list by the previous loop. | |
1810 | */ | |
fc8f999d | 1811 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1812 | unregister_netdevice_queue(t->dev, |
1813 | head); | |
753ea8e9 | 1814 | t = rtnl_dereference(t->next); |
62808f91 | 1815 | } |
db44575f AK |
1816 | } |
1817 | } | |
1818 | } | |
1819 | ||
2c8c1e72 | 1820 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1821 | { |
67101172 | 1822 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1823 | struct ip_tunnel *t; |
8190d900 | 1824 | int err; |
8190d900 | 1825 | |
29182176 PE |
1826 | sitn->tunnels[0] = sitn->tunnels_wc; |
1827 | sitn->tunnels[1] = sitn->tunnels_l; | |
1828 | sitn->tunnels[2] = sitn->tunnels_r; | |
1829 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1830 | ||
cd3dbc19 | 1831 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1832 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1833 | ipip6_tunnel_setup); |
1834 | if (!sitn->fb_tunnel_dev) { | |
1835 | err = -ENOMEM; | |
1836 | goto err_alloc_dev; | |
1837 | } | |
be77e593 | 1838 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1839 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1840 | /* FB netdevice is special: we have one, and only one per netns. |
1841 | * Allowing to move it to another netns is clearly unsafe. | |
1842 | */ | |
1843 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1844 | |
e5d08d71 IM |
1845 | err = register_netdev(sitn->fb_tunnel_dev); |
1846 | if (err) | |
cd3dbc19 PE |
1847 | goto err_reg_dev; |
1848 | ||
4ece9009 ED |
1849 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
1850 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1851 | ||
72b36015 TF |
1852 | t = netdev_priv(sitn->fb_tunnel_dev); |
1853 | ||
1854 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1855 | return 0; |
1856 | ||
cd3dbc19 | 1857 | err_reg_dev: |
dd4080ee | 1858 | ipip6_dev_free(sitn->fb_tunnel_dev); |
cd3dbc19 | 1859 | err_alloc_dev: |
8190d900 PE |
1860 | return err; |
1861 | } | |
1862 | ||
bb401cae | 1863 | static void __net_exit sit_exit_batch_net(struct list_head *net_list) |
8190d900 | 1864 | { |
62808f91 | 1865 | LIST_HEAD(list); |
bb401cae | 1866 | struct net *net; |
8190d900 | 1867 | |
cd3dbc19 | 1868 | rtnl_lock(); |
bb401cae ED |
1869 | list_for_each_entry(net, net_list, exit_list) |
1870 | sit_destroy_tunnels(net, &list); | |
1871 | ||
62808f91 | 1872 | unregister_netdevice_many(&list); |
cd3dbc19 | 1873 | rtnl_unlock(); |
8190d900 PE |
1874 | } |
1875 | ||
1876 | static struct pernet_operations sit_net_ops = { | |
1877 | .init = sit_init_net, | |
bb401cae | 1878 | .exit_batch = sit_exit_batch_net, |
67101172 EB |
1879 | .id = &sit_net_id, |
1880 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1881 | }; |
1882 | ||
89c89458 | 1883 | static void __exit sit_cleanup(void) |
1da177e4 | 1884 | { |
ba3e3f50 | 1885 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1886 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1887 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
49dbe7ae SH |
1888 | #if IS_ENABLED(CONFIG_MPLS) |
1889 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1890 | #endif | |
db44575f | 1891 | |
67101172 | 1892 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1893 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1894 | } |
1895 | ||
89c89458 | 1896 | static int __init sit_init(void) |
1da177e4 LT |
1897 | { |
1898 | int err; | |
1899 | ||
49dbe7ae | 1900 | pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 1901 | |
67101172 | 1902 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1903 | if (err < 0) |
d5aa407f AD |
1904 | return err; |
1905 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1906 | if (err < 0) { | |
32b8a8e5 | 1907 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1908 | goto xfrm_tunnel_failed; |
d5aa407f | 1909 | } |
32b8a8e5 ND |
1910 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1911 | if (err < 0) { | |
1912 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1913 | goto xfrm_tunnel4_failed; | |
1914 | } | |
49dbe7ae SH |
1915 | #if IS_ENABLED(CONFIG_MPLS) |
1916 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
1917 | if (err < 0) { | |
1918 | pr_info("%s: can't register mplsip\n", __func__); | |
1919 | goto xfrm_tunnel_mpls_failed; | |
1920 | } | |
1921 | #endif | |
ba3e3f50 ND |
1922 | err = rtnl_link_register(&sit_link_ops); |
1923 | if (err < 0) | |
1924 | goto rtnl_link_failed; | |
1925 | ||
1926 | out: | |
1da177e4 | 1927 | return err; |
ba3e3f50 ND |
1928 | |
1929 | rtnl_link_failed: | |
49dbe7ae SH |
1930 | #if IS_ENABLED(CONFIG_MPLS) |
1931 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1932 | xfrm_tunnel_mpls_failed: | |
1933 | #endif | |
32b8a8e5 ND |
1934 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
1935 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
1936 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1937 | xfrm_tunnel_failed: | |
1938 | unregister_pernet_device(&sit_net_ops); | |
1939 | goto out; | |
1da177e4 | 1940 | } |
989e5b96 JR |
1941 | |
1942 | module_init(sit_init); | |
1943 | module_exit(sit_cleanup); | |
39c85086 | 1944 | MODULE_LICENSE("GPL"); |
f98f89a0 | 1945 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 1946 | MODULE_ALIAS_NETDEV("sit0"); |