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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
4 | * Linux INET6 implementation | |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
9 | * | |
1da177e4 LT |
10 | * Changes: |
11 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
12 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 13 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
14 | */ |
15 | ||
f3213831 JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
1da177e4 | 18 | #include <linux/module.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/errno.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
1da177e4 LT |
24 | #include <linux/net.h> |
25 | #include <linux/in6.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/if_arp.h> | |
28 | #include <linux/icmp.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
7c0f6ba6 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 33 | #include <linux/if_ether.h> |
1da177e4 LT |
34 | |
35 | #include <net/sock.h> | |
36 | #include <net/snmp.h> | |
37 | ||
38 | #include <net/ipv6.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/transp_v6.h> | |
41 | #include <net/ip6_fib.h> | |
42 | #include <net/ip6_route.h> | |
43 | #include <net/ndisc.h> | |
44 | #include <net/addrconf.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/udp.h> | |
47 | #include <net/icmp.h> | |
c5441932 | 48 | #include <net/ip_tunnels.h> |
1da177e4 LT |
49 | #include <net/inet_ecn.h> |
50 | #include <net/xfrm.h> | |
51 | #include <net/dsfield.h> | |
8190d900 PE |
52 | #include <net/net_namespace.h> |
53 | #include <net/netns/generic.h> | |
1da177e4 LT |
54 | |
55 | /* | |
56 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
57 | ||
58 | For comments look at net/ipv4/ip_gre.c --ANK | |
59 | */ | |
60 | ||
e87a8f24 | 61 | #define IP6_SIT_HASH_SIZE 16 |
e69a4adc | 62 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 63 | |
f4e0b4c5 ND |
64 | static bool log_ecn_error = true; |
65 | module_param(log_ecn_error, bool, 0644); | |
66 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
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); |
218774dc HFS |
71 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
72 | __be32 *v4dst); | |
ba3e3f50 | 73 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 74 | |
c7d03a00 | 75 | static unsigned int sit_net_id __read_mostly; |
8190d900 | 76 | struct sit_net { |
e87a8f24 JK |
77 | struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; |
78 | struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; | |
79 | struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; | |
3a43be3c ED |
80 | struct ip_tunnel __rcu *tunnels_wc[1]; |
81 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 82 | |
cd3dbc19 | 83 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
84 | }; |
85 | ||
4543c10d ED |
86 | /* |
87 | * Must be invoked with rcu_read_lock | |
88 | */ | |
3e866703 | 89 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
3051fbec DA |
90 | struct net_device *dev, |
91 | __be32 remote, __be32 local, | |
92 | int sifindex) | |
1da177e4 | 93 | { |
3a43be3c ED |
94 | unsigned int h0 = HASH(remote); |
95 | unsigned int h1 = HASH(local); | |
1da177e4 | 96 | struct ip_tunnel *t; |
29182176 | 97 | struct sit_net *sitn = net_generic(net, sit_net_id); |
3051fbec | 98 | int ifindex = dev ? dev->ifindex : 0; |
1da177e4 | 99 | |
e086cadc | 100 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 101 | if (local == t->parms.iph.saddr && |
4fddbf5d | 102 | remote == t->parms.iph.daddr && |
3051fbec DA |
103 | (!dev || !t->parms.link || ifindex == t->parms.link || |
104 | sifindex == t->parms.link) && | |
4fddbf5d | 105 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
106 | return t; |
107 | } | |
e086cadc | 108 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d | 109 | if (remote == t->parms.iph.daddr && |
3051fbec DA |
110 | (!dev || !t->parms.link || ifindex == t->parms.link || |
111 | sifindex == t->parms.link) && | |
4fddbf5d | 112 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
113 | return t; |
114 | } | |
e086cadc | 115 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d | 116 | if (local == t->parms.iph.saddr && |
3051fbec DA |
117 | (!dev || !t->parms.link || ifindex == t->parms.link || |
118 | sifindex == t->parms.link) && | |
4fddbf5d | 119 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
120 | return t; |
121 | } | |
4543c10d | 122 | t = rcu_dereference(sitn->tunnels_wc[0]); |
53b24b8f | 123 | if (t && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
124 | return t; |
125 | return NULL; | |
126 | } | |
127 | ||
3a43be3c | 128 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 129 | struct ip_tunnel_parm *parms) |
1da177e4 | 130 | { |
420fe234 YH |
131 | __be32 remote = parms->iph.daddr; |
132 | __be32 local = parms->iph.saddr; | |
3a43be3c | 133 | unsigned int h = 0; |
1da177e4 LT |
134 | int prio = 0; |
135 | ||
136 | if (remote) { | |
137 | prio |= 2; | |
138 | h ^= HASH(remote); | |
139 | } | |
140 | if (local) { | |
141 | prio |= 1; | |
142 | h ^= HASH(local); | |
143 | } | |
29182176 | 144 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
145 | } |
146 | ||
3a43be3c | 147 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 148 | struct ip_tunnel *t) |
420fe234 | 149 | { |
ca8def14 | 150 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
151 | } |
152 | ||
ca8def14 | 153 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 154 | { |
3a43be3c ED |
155 | struct ip_tunnel __rcu **tp; |
156 | struct ip_tunnel *iter; | |
157 | ||
158 | for (tp = ipip6_bucket(sitn, t); | |
159 | (iter = rtnl_dereference(*tp)) != NULL; | |
160 | tp = &iter->next) { | |
161 | if (t == iter) { | |
cf778b00 | 162 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
163 | break; |
164 | } | |
165 | } | |
166 | } | |
167 | ||
ca8def14 | 168 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 169 | { |
3a43be3c | 170 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 171 | |
cf778b00 ED |
172 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
173 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
174 | } |
175 | ||
e0c93948 | 176 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
177 | { |
178 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
179 | struct ip_tunnel *t = netdev_priv(dev); |
180 | ||
79134e6c | 181 | if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { |
fa857afc YH |
182 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); |
183 | t->ip6rd.relay_prefix = 0; | |
184 | t->ip6rd.prefixlen = 16; | |
185 | t->ip6rd.relay_prefixlen = 0; | |
186 | } else { | |
187 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
188 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
189 | } | |
190 | #endif | |
191 | } | |
192 | ||
f3723416 ND |
193 | static int ipip6_tunnel_create(struct net_device *dev) |
194 | { | |
195 | struct ip_tunnel *t = netdev_priv(dev); | |
196 | struct net *net = dev_net(dev); | |
197 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
198 | int err; | |
199 | ||
ebe084aa SK |
200 | memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); |
201 | memcpy(dev->broadcast, &t->parms.iph.daddr, 4); | |
f3723416 | 202 | |
d440b720 | 203 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
204 | dev->priv_flags |= IFF_ISATAP; |
205 | ||
87e57399 TLSC |
206 | dev->rtnl_link_ops = &sit_link_ops; |
207 | ||
f3723416 ND |
208 | err = register_netdevice(dev); |
209 | if (err < 0) | |
210 | goto out; | |
211 | ||
ebe084aa SK |
212 | ipip6_tunnel_clone_6rd(dev, sitn); |
213 | ||
f3723416 ND |
214 | dev_hold(dev); |
215 | ||
216 | ipip6_tunnel_link(sitn, t); | |
217 | return 0; | |
218 | ||
219 | out: | |
220 | return err; | |
221 | } | |
222 | ||
3a43be3c | 223 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 224 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 225 | { |
e69a4adc AV |
226 | __be32 remote = parms->iph.daddr; |
227 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
228 | struct ip_tunnel *t, *nt; |
229 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 230 | struct net_device *dev; |
1da177e4 | 231 | char name[IFNAMSIZ]; |
ca8def14 | 232 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 233 | |
3a43be3c ED |
234 | for (tp = __ipip6_bucket(sitn, parms); |
235 | (t = rtnl_dereference(*tp)) != NULL; | |
236 | tp = &t->next) { | |
8db99e57 | 237 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
238 | remote == t->parms.iph.daddr && |
239 | parms->link == t->parms.link) { | |
8db99e57 SH |
240 | if (create) |
241 | return NULL; | |
242 | else | |
243 | return t; | |
244 | } | |
1da177e4 LT |
245 | } |
246 | if (!create) | |
247 | goto failed; | |
248 | ||
b95211e0 ED |
249 | if (parms->name[0]) { |
250 | if (!dev_valid_name(parms->name)) | |
251 | goto failed; | |
1da177e4 | 252 | strlcpy(name, parms->name, IFNAMSIZ); |
b95211e0 | 253 | } else { |
15fc1f70 | 254 | strcpy(name, "sit%d"); |
b95211e0 | 255 | } |
c835a677 TG |
256 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
257 | ipip6_tunnel_setup); | |
63159f29 | 258 | if (!dev) |
1da177e4 LT |
259 | return NULL; |
260 | ||
7a97146c PE |
261 | dev_net_set(dev, net); |
262 | ||
2941a486 | 263 | nt = netdev_priv(dev); |
1326c3d5 | 264 | |
1da177e4 | 265 | nt->parms = *parms; |
f3723416 | 266 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 267 | goto failed_free; |
1da177e4 | 268 | |
1da177e4 LT |
269 | return nt; |
270 | ||
b37d428b | 271 | failed_free: |
cf124db5 | 272 | free_netdev(dev); |
1da177e4 LT |
273 | failed: |
274 | return NULL; | |
275 | } | |
276 | ||
ef9a9d11 ED |
277 | #define for_each_prl_rcu(start) \ |
278 | for (prl = rcu_dereference(start); \ | |
279 | prl; \ | |
280 | prl = rcu_dereference(prl->next)) | |
281 | ||
fadf6bf0 | 282 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 283 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 284 | { |
ef9a9d11 | 285 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 286 | |
ef9a9d11 ED |
287 | for_each_prl_rcu(t->prl) |
288 | if (prl->addr == addr) | |
fadf6bf0 | 289 | break; |
ef9a9d11 | 290 | return prl; |
fadf6bf0 TF |
291 | |
292 | } | |
293 | ||
2b4743bd YH |
294 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
295 | struct ip_tunnel_prl __user *a) | |
300aaeea | 296 | { |
2b4743bd | 297 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
298 | struct ip_tunnel_prl_entry *prl; |
299 | unsigned int cmax, c = 0, ca, len; | |
300 | int ret = 0; | |
301 | ||
2b4743bd YH |
302 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
303 | return -EFAULT; | |
304 | cmax = kprl.datalen / sizeof(kprl); | |
305 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
306 | cmax = 1; |
307 | ||
308 | /* For simple GET or for root users, | |
309 | * we try harder to allocate. | |
310 | */ | |
311 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
0ccc22f4 | 312 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
300aaeea YH |
313 | NULL; |
314 | ||
ef9a9d11 | 315 | rcu_read_lock(); |
300aaeea YH |
316 | |
317 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
318 | ||
319 | if (!kp) { | |
320 | /* We don't try hard to allocate much memory for | |
321 | * non-root users. | |
322 | * For root users, retry allocating enough memory for | |
323 | * the answer. | |
324 | */ | |
325 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
326 | if (!kp) { | |
327 | ret = -ENOMEM; | |
328 | goto out; | |
329 | } | |
330 | } | |
331 | ||
332 | c = 0; | |
ef9a9d11 | 333 | for_each_prl_rcu(t->prl) { |
298bf12d | 334 | if (c >= cmax) |
300aaeea | 335 | break; |
2b4743bd | 336 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
337 | continue; |
338 | kp[c].addr = prl->addr; | |
339 | kp[c].flags = prl->flags; | |
340 | c++; | |
2b4743bd | 341 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
342 | break; |
343 | } | |
344 | out: | |
ef9a9d11 | 345 | rcu_read_unlock(); |
300aaeea YH |
346 | |
347 | len = sizeof(*kp) * c; | |
2b4743bd YH |
348 | ret = 0; |
349 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
350 | ret = -EFAULT; | |
300aaeea YH |
351 | |
352 | kfree(kp); | |
300aaeea | 353 | |
2b4743bd | 354 | return ret; |
300aaeea YH |
355 | } |
356 | ||
fadf6bf0 TF |
357 | static int |
358 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
359 | { | |
360 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
361 | int err = 0; |
362 | ||
0009ae1f YH |
363 | if (a->addr == htonl(INADDR_ANY)) |
364 | return -EINVAL; | |
365 | ||
aac4dddc | 366 | ASSERT_RTNL(); |
fadf6bf0 | 367 | |
3a43be3c | 368 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 369 | if (p->addr == a->addr) { |
ef9a9d11 ED |
370 | if (chg) { |
371 | p->flags = a->flags; | |
372 | goto out; | |
373 | } | |
3fcfa129 YH |
374 | err = -EEXIST; |
375 | goto out; | |
fadf6bf0 TF |
376 | } |
377 | } | |
378 | ||
3fcfa129 YH |
379 | if (chg) { |
380 | err = -ENXIO; | |
381 | goto out; | |
382 | } | |
fadf6bf0 TF |
383 | |
384 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
385 | if (!p) { |
386 | err = -ENOBUFS; | |
387 | goto out; | |
388 | } | |
fadf6bf0 | 389 | |
fadf6bf0 | 390 | p->next = t->prl; |
300aaeea YH |
391 | p->addr = a->addr; |
392 | p->flags = a->flags; | |
ef9a9d11 | 393 | t->prl_count++; |
cf778b00 | 394 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 395 | out: |
3fcfa129 | 396 | return err; |
fadf6bf0 TF |
397 | } |
398 | ||
ef9a9d11 ED |
399 | static void prl_list_destroy_rcu(struct rcu_head *head) |
400 | { | |
401 | struct ip_tunnel_prl_entry *p, *n; | |
402 | ||
403 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
404 | do { | |
753ea8e9 | 405 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
406 | kfree(p); |
407 | p = n; | |
408 | } while (p); | |
409 | } | |
410 | ||
fadf6bf0 TF |
411 | static int |
412 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
413 | { | |
753ea8e9 ED |
414 | struct ip_tunnel_prl_entry *x; |
415 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
416 | int err = 0; |
417 | ||
aac4dddc | 418 | ASSERT_RTNL(); |
fadf6bf0 | 419 | |
0009ae1f | 420 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
421 | for (p = &t->prl; |
422 | (x = rtnl_dereference(*p)) != NULL; | |
423 | p = &x->next) { | |
424 | if (x->addr == a->addr) { | |
fadf6bf0 | 425 | *p = x->next; |
11c476f3 | 426 | kfree_rcu(x, rcu_head); |
300aaeea | 427 | t->prl_count--; |
3fcfa129 | 428 | goto out; |
fadf6bf0 TF |
429 | } |
430 | } | |
3fcfa129 | 431 | err = -ENXIO; |
fadf6bf0 | 432 | } else { |
753ea8e9 ED |
433 | x = rtnl_dereference(t->prl); |
434 | if (x) { | |
ef9a9d11 | 435 | t->prl_count = 0; |
ef9a9d11 ED |
436 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
437 | t->prl = NULL; | |
fadf6bf0 TF |
438 | } |
439 | } | |
3fcfa129 | 440 | out: |
4b279601 | 441 | return err; |
fadf6bf0 TF |
442 | } |
443 | ||
fadf6bf0 | 444 | static int |
b71d1d42 | 445 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 446 | { |
3fcfa129 | 447 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
448 | int ok = 1; |
449 | ||
ef9a9d11 | 450 | rcu_read_lock(); |
3fcfa129 | 451 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 452 | if (p) { |
300aaeea | 453 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
454 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
455 | else | |
456 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
457 | } else { | |
b71d1d42 ED |
458 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
459 | ||
fadf6bf0 TF |
460 | if (ipv6_addr_is_isatap(addr6) && |
461 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 462 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
463 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
464 | else | |
465 | ok = 0; | |
466 | } | |
ef9a9d11 | 467 | rcu_read_unlock(); |
fadf6bf0 TF |
468 | return ok; |
469 | } | |
470 | ||
1da177e4 LT |
471 | static void ipip6_tunnel_uninit(struct net_device *dev) |
472 | { | |
5e6700b3 ND |
473 | struct ip_tunnel *tunnel = netdev_priv(dev); |
474 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 475 | |
cd3dbc19 | 476 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 477 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 478 | } else { |
5e6700b3 ND |
479 | ipip6_tunnel_unlink(sitn, tunnel); |
480 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 481 | } |
e09acddf | 482 | dst_cache_reset(&tunnel->dst_cache); |
3a43be3c | 483 | dev_put(dev); |
1da177e4 LT |
484 | } |
485 | ||
c73cb5a2 | 486 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 487 | { |
b71d1d42 | 488 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
489 | const int type = icmp_hdr(skb)->type; |
490 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 491 | unsigned int data_len = 0; |
1da177e4 | 492 | struct ip_tunnel *t; |
3051fbec | 493 | int sifindex; |
c73cb5a2 | 494 | int err; |
1da177e4 LT |
495 | |
496 | switch (type) { | |
497 | default: | |
498 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 499 | return 0; |
1da177e4 LT |
500 | |
501 | case ICMP_DEST_UNREACH: | |
502 | switch (code) { | |
503 | case ICMP_SR_FAILED: | |
1da177e4 | 504 | /* Impossible event. */ |
c73cb5a2 | 505 | return 0; |
1da177e4 LT |
506 | default: |
507 | /* All others are translated to HOST_UNREACH. | |
508 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
509 | I believe they are just ether pollution. --ANK | |
510 | */ | |
511 | break; | |
512 | } | |
513 | break; | |
514 | case ICMP_TIME_EXCEEDED: | |
515 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 516 | return 0; |
20e1954f | 517 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 518 | break; |
ec18d9a2 DM |
519 | case ICMP_REDIRECT: |
520 | break; | |
1da177e4 LT |
521 | } |
522 | ||
c73cb5a2 KM |
523 | err = -ENOENT; |
524 | ||
3051fbec DA |
525 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
526 | t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
527 | iph->daddr, iph->saddr, sifindex); | |
63159f29 | 528 | if (!t) |
36393395 DM |
529 | goto out; |
530 | ||
531 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
532 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d888f396 | 533 | t->parms.link, iph->protocol); |
36393395 DM |
534 | err = 0; |
535 | goto out; | |
536 | } | |
ec18d9a2 | 537 | if (type == ICMP_REDIRECT) { |
1042caa7 MŻ |
538 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, |
539 | iph->protocol); | |
ec18d9a2 DM |
540 | err = 0; |
541 | goto out; | |
542 | } | |
36393395 | 543 | |
2d7a3b27 | 544 | err = 0; |
173656ac HL |
545 | if (__in6_dev_get(skb->dev) && |
546 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) | |
1da177e4 | 547 | goto out; |
c73cb5a2 | 548 | |
2d7a3b27 | 549 | if (t->parms.iph.daddr == 0) |
ca15a078 OG |
550 | goto out; |
551 | ||
1da177e4 LT |
552 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
553 | goto out; | |
554 | ||
bb80087a | 555 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
556 | t->err_count++; |
557 | else | |
558 | t->err_count = 1; | |
559 | t->err_time = jiffies; | |
560 | out: | |
c73cb5a2 | 561 | return err; |
1da177e4 LT |
562 | } |
563 | ||
218774dc HFS |
564 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
565 | const struct in6_addr *v6addr) | |
566 | { | |
567 | __be32 v4embed = 0; | |
568 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
569 | return true; | |
570 | return false; | |
571 | } | |
572 | ||
7df37ff3 CB |
573 | /* Checks if an address matches an address on the tunnel interface. |
574 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
575 | * Long story: | |
576 | * This function is called after we considered the packet as spoofed | |
577 | * in is_spoofed_6rd. | |
578 | * We may have a router that is doing NAT for proto 41 packets | |
579 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
580 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
581 | * function will return true, dropping the packet. | |
582 | * But, we can still check if is spoofed against the IP | |
583 | * addresses associated with the interface. | |
584 | */ | |
585 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
586 | const struct in6_addr *v6dst) | |
587 | { | |
588 | int prefix_len; | |
589 | ||
590 | #ifdef CONFIG_IPV6_SIT_6RD | |
591 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
592 | - tunnel->ip6rd.relay_prefixlen; | |
593 | #else | |
594 | prefix_len = 48; | |
595 | #endif | |
596 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
597 | } | |
598 | ||
599 | /* Returns true if a packet is spoofed */ | |
600 | static bool packet_is_spoofed(struct sk_buff *skb, | |
601 | const struct iphdr *iph, | |
602 | struct ip_tunnel *tunnel) | |
603 | { | |
604 | const struct ipv6hdr *ipv6h; | |
605 | ||
606 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
607 | if (!isatap_chksrc(skb, iph, tunnel)) | |
608 | return true; | |
609 | ||
610 | return false; | |
611 | } | |
612 | ||
613 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
614 | return false; | |
615 | ||
616 | ipv6h = ipv6_hdr(skb); | |
617 | ||
618 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
619 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
620 | &iph->saddr, &ipv6h->saddr, | |
621 | &iph->daddr, &ipv6h->daddr); | |
622 | return true; | |
623 | } | |
624 | ||
625 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
626 | return false; | |
627 | ||
628 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
629 | return false; | |
630 | ||
631 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
632 | &iph->saddr, &ipv6h->saddr, | |
633 | &iph->daddr, &ipv6h->daddr); | |
634 | return true; | |
635 | } | |
636 | ||
1da177e4 LT |
637 | static int ipip6_rcv(struct sk_buff *skb) |
638 | { | |
1ad759d8 | 639 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 640 | struct ip_tunnel *tunnel; |
3051fbec | 641 | int sifindex; |
f4e0b4c5 | 642 | int err; |
1da177e4 | 643 | |
3051fbec | 644 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
4fddbf5d | 645 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 646 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 647 | if (tunnel) { |
8f84985f | 648 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 649 | |
32b8a8e5 ND |
650 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
651 | tunnel->parms.iph.protocol != 0) | |
652 | goto out; | |
653 | ||
b0e380b1 | 654 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 655 | skb_reset_network_header(skb); |
8cdfab8a | 656 | IPCB(skb)->flags = 0; |
a09a4c8d | 657 | skb->dev = tunnel->dev; |
c7dc89c0 | 658 | |
7df37ff3 CB |
659 | if (packet_is_spoofed(skb, iph, tunnel)) { |
660 | tunnel->dev->stats.rx_errors++; | |
661 | goto out; | |
f4e0b4c5 ND |
662 | } |
663 | ||
a09a4c8d JG |
664 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
665 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
666 | goto out; | |
f4e0b4c5 | 667 | |
bb9bd814 LB |
668 | /* skb can be uncloned in iptunnel_pull_header, so |
669 | * old iph is no longer valid | |
670 | */ | |
671 | iph = (const struct iphdr *)skb_mac_header(skb); | |
f4e0b4c5 ND |
672 | err = IP_ECN_decapsulate(iph, skb); |
673 | if (unlikely(err)) { | |
674 | if (log_ecn_error) | |
675 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
676 | &iph->saddr, iph->tos); | |
677 | if (err > 1) { | |
678 | ++tunnel->dev->stats.rx_frame_errors; | |
679 | ++tunnel->dev->stats.rx_errors; | |
680 | goto out; | |
681 | } | |
c7dc89c0 | 682 | } |
d19d56dd | 683 | |
15fc1f70 | 684 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 685 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
686 | tstats->rx_packets++; |
687 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 688 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 689 | |
caf586e5 | 690 | netif_rx(skb); |
8990f468 | 691 | |
1da177e4 LT |
692 | return 0; |
693 | } | |
694 | ||
6dcdd1b3 | 695 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 696 | return 1; |
1da177e4 | 697 | out: |
36ca34cc | 698 | kfree_skb(skb); |
1da177e4 LT |
699 | return 0; |
700 | } | |
701 | ||
49dbe7ae | 702 | static const struct tnl_ptk_info ipip_tpi = { |
32b8a8e5 ND |
703 | /* no tunnel info required for ipip. */ |
704 | .proto = htons(ETH_P_IP), | |
705 | }; | |
706 | ||
49dbe7ae SH |
707 | #if IS_ENABLED(CONFIG_MPLS) |
708 | static const struct tnl_ptk_info mplsip_tpi = { | |
709 | /* no tunnel info required for mplsip. */ | |
710 | .proto = htons(ETH_P_MPLS_UC), | |
711 | }; | |
712 | #endif | |
713 | ||
714 | static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
32b8a8e5 | 715 | { |
3d7b46cd | 716 | const struct iphdr *iph; |
32b8a8e5 | 717 | struct ip_tunnel *tunnel; |
3051fbec DA |
718 | int sifindex; |
719 | ||
720 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; | |
32b8a8e5 | 721 | |
3d7b46cd | 722 | iph = ip_hdr(skb); |
32b8a8e5 | 723 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 724 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 725 | if (tunnel) { |
49dbe7ae SH |
726 | const struct tnl_ptk_info *tpi; |
727 | ||
728 | if (tunnel->parms.iph.protocol != ipproto && | |
32b8a8e5 ND |
729 | tunnel->parms.iph.protocol != 0) |
730 | goto drop; | |
731 | ||
732 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
733 | goto drop; | |
49dbe7ae SH |
734 | #if IS_ENABLED(CONFIG_MPLS) |
735 | if (ipproto == IPPROTO_MPLS) | |
736 | tpi = &mplsip_tpi; | |
737 | else | |
738 | #endif | |
739 | tpi = &ipip_tpi; | |
740 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 741 | goto drop; |
49dbe7ae | 742 | return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
32b8a8e5 ND |
743 | } |
744 | ||
745 | return 1; | |
746 | ||
747 | drop: | |
748 | kfree_skb(skb); | |
749 | return 0; | |
750 | } | |
751 | ||
49dbe7ae SH |
752 | static int ipip_rcv(struct sk_buff *skb) |
753 | { | |
754 | return sit_tunnel_rcv(skb, IPPROTO_IPIP); | |
755 | } | |
756 | ||
757 | #if IS_ENABLED(CONFIG_MPLS) | |
758 | static int mplsip_rcv(struct sk_buff *skb) | |
759 | { | |
760 | return sit_tunnel_rcv(skb, IPPROTO_MPLS); | |
761 | } | |
762 | #endif | |
763 | ||
fa857afc | 764 | /* |
218774dc HFS |
765 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
766 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 767 | */ |
218774dc HFS |
768 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
769 | __be32 *v4dst) | |
1da177e4 | 770 | { |
fa857afc YH |
771 | #ifdef CONFIG_IPV6_SIT_6RD |
772 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
773 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 774 | unsigned int pbw0, pbi0; |
fa857afc YH |
775 | int pbi1; |
776 | u32 d; | |
777 | ||
778 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
779 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
780 | ||
a843dc4e ML |
781 | d = tunnel->ip6rd.relay_prefixlen < 32 ? |
782 | (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
783 | tunnel->ip6rd.relay_prefixlen : 0; | |
fa857afc YH |
784 | |
785 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
786 | if (pbi1 > 0) | |
e7db38c3 | 787 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
788 | (32 - pbi1); |
789 | ||
218774dc HFS |
790 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
791 | return true; | |
fa857afc YH |
792 | } |
793 | #else | |
1da177e4 | 794 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 795 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
796 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
797 | return true; | |
1da177e4 | 798 | } |
fa857afc | 799 | #endif |
218774dc HFS |
800 | return false; |
801 | } | |
802 | ||
803 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
804 | const struct in6_addr *v6dst) | |
805 | { | |
806 | __be32 dst = 0; | |
807 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
808 | return dst; |
809 | } | |
810 | ||
811 | /* | |
812 | * This function assumes it is being called from dev_queue_xmit() | |
813 | * and that skb is filled properly by that function. | |
814 | */ | |
815 | ||
6fef4c0c SH |
816 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
817 | struct net_device *dev) | |
1da177e4 | 818 | { |
2941a486 | 819 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
820 | const struct iphdr *tiph = &tunnel->parms.iph; |
821 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 822 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 823 | __be16 df = tiph->frag_off; |
67ba4152 IM |
824 | struct rtable *rt; /* Route to the other host */ |
825 | struct net_device *tdev; /* Device to other host */ | |
826 | unsigned int max_headroom; /* The extra header space needed */ | |
e69a4adc | 827 | __be32 dst = tiph->daddr; |
31e4543d | 828 | struct flowi4 fl4; |
1da177e4 | 829 | int mtu; |
b71d1d42 | 830 | const struct in6_addr *addr6; |
1da177e4 | 831 | int addr_type; |
0e6fbc5b | 832 | u8 ttl; |
14909664 TH |
833 | u8 protocol = IPPROTO_IPV6; |
834 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1da177e4 | 835 | |
c2bceb3d LEM |
836 | if (tos == 1) |
837 | tos = ipv6_get_dsfield(iph6); | |
838 | ||
c7dc89c0 FT |
839 | /* ISATAP (RFC4214) - must come before 6to4 */ |
840 | if (dev->priv_flags & IFF_ISATAP) { | |
841 | struct neighbour *neigh = NULL; | |
1e2927b0 | 842 | bool do_tx_error = false; |
c7dc89c0 | 843 | |
adf30907 | 844 | if (skb_dst(skb)) |
1e2927b0 | 845 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 | 846 | |
63159f29 | 847 | if (!neigh) { |
7df37ff3 | 848 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
849 | goto tx_error; |
850 | } | |
851 | ||
3e866703 | 852 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
853 | addr_type = ipv6_addr_type(addr6); |
854 | ||
855 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
856 | ipv6_addr_is_isatap(addr6)) | |
857 | dst = addr6->s6_addr32[3]; | |
858 | else | |
1e2927b0 DM |
859 | do_tx_error = true; |
860 | ||
861 | neigh_release(neigh); | |
862 | if (do_tx_error) | |
c7dc89c0 FT |
863 | goto tx_error; |
864 | } | |
865 | ||
1da177e4 | 866 | if (!dst) |
218774dc | 867 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
868 | |
869 | if (!dst) { | |
870 | struct neighbour *neigh = NULL; | |
1e2927b0 | 871 | bool do_tx_error = false; |
1da177e4 | 872 | |
adf30907 | 873 | if (skb_dst(skb)) |
1e2927b0 | 874 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 | 875 | |
63159f29 | 876 | if (!neigh) { |
7df37ff3 | 877 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
878 | goto tx_error; |
879 | } | |
880 | ||
3e866703 | 881 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
882 | addr_type = ipv6_addr_type(addr6); |
883 | ||
884 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 885 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
886 | addr_type = ipv6_addr_type(addr6); |
887 | } | |
888 | ||
1e2927b0 DM |
889 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
890 | dst = addr6->s6_addr32[3]; | |
891 | else | |
892 | do_tx_error = true; | |
1da177e4 | 893 | |
1e2927b0 DM |
894 | neigh_release(neigh); |
895 | if (do_tx_error) | |
896 | goto tx_error; | |
1da177e4 LT |
897 | } |
898 | ||
9830ad4c CG |
899 | flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
900 | RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, | |
901 | 0, dst, tiph->saddr, 0, 0, | |
902 | sock_net_uid(tunnel->net, NULL)); | |
903 | rt = ip_route_output_flow(tunnel->net, &fl4, NULL); | |
904 | ||
78fbfd8a DM |
905 | if (IS_ERR(rt)) { |
906 | dev->stats.tx_carrier_errors++; | |
907 | goto tx_error_icmp; | |
1da177e4 LT |
908 | } |
909 | if (rt->rt_type != RTN_UNICAST) { | |
910 | ip_rt_put(rt); | |
15fc1f70 | 911 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
912 | goto tx_error_icmp; |
913 | } | |
d8d1f30b | 914 | tdev = rt->dst.dev; |
1da177e4 LT |
915 | |
916 | if (tdev == dev) { | |
917 | ip_rt_put(rt); | |
15fc1f70 | 918 | dev->stats.collisions++; |
1da177e4 LT |
919 | goto tx_error; |
920 | } | |
921 | ||
7e13318d | 922 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
14909664 | 923 | ip_rt_put(rt); |
aed069df | 924 | goto tx_error; |
14909664 TH |
925 | } |
926 | ||
292f4f3c | 927 | if (df) { |
14909664 | 928 | mtu = dst_mtu(&rt->dst) - t_hlen; |
1da177e4 | 929 | |
292f4f3c | 930 | if (mtu < 68) { |
15fc1f70 | 931 | dev->stats.collisions++; |
292f4f3c HX |
932 | ip_rt_put(rt); |
933 | goto tx_error; | |
934 | } | |
1da177e4 | 935 | |
292f4f3c HX |
936 | if (mtu < IPV6_MIN_MTU) { |
937 | mtu = IPV6_MIN_MTU; | |
938 | df = 0; | |
939 | } | |
940 | ||
f15ca723 ND |
941 | if (tunnel->parms.iph.daddr) |
942 | skb_dst_update_pmtu(skb, mtu); | |
292f4f3c | 943 | |
58a47824 | 944 | if (skb->len > mtu && !skb_is_gso(skb)) { |
3ffe533c | 945 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
946 | ip_rt_put(rt); |
947 | goto tx_error; | |
948 | } | |
1da177e4 LT |
949 | } |
950 | ||
951 | if (tunnel->err_count > 0) { | |
bb80087a WY |
952 | if (time_before(jiffies, |
953 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
954 | tunnel->err_count--; |
955 | dst_link_failure(skb); | |
956 | } else | |
957 | tunnel->err_count = 0; | |
958 | } | |
959 | ||
960 | /* | |
961 | * Okay, now see if we can stuff it in the buffer as-is. | |
962 | */ | |
14909664 | 963 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; |
1da177e4 | 964 | |
cfbba49d PM |
965 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
966 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
967 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
968 | if (!new_skb) { | |
969 | ip_rt_put(rt); | |
15fc1f70 | 970 | dev->stats.tx_dropped++; |
66028310 | 971 | kfree_skb(skb); |
6ed10654 | 972 | return NETDEV_TX_OK; |
1da177e4 LT |
973 | } |
974 | if (skb->sk) | |
975 | skb_set_owner_w(new_skb, skb->sk); | |
976 | dev_kfree_skb(skb); | |
977 | skb = new_skb; | |
0660e03f | 978 | iph6 = ipv6_hdr(skb); |
1da177e4 | 979 | } |
0e6fbc5b PS |
980 | ttl = tiph->ttl; |
981 | if (ttl == 0) | |
982 | ttl = iph6->hop_limit; | |
983 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 984 | |
14909664 | 985 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
6a9eadcc | 986 | ip_rt_put(rt); |
14909664 | 987 | goto tx_error; |
6a9eadcc | 988 | } |
3d483058 | 989 | |
469471cd TH |
990 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
991 | ||
039f5062 PS |
992 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
993 | df, !net_eq(tunnel->net, dev_net(dev))); | |
6ed10654 | 994 | return NETDEV_TX_OK; |
1da177e4 LT |
995 | |
996 | tx_error_icmp: | |
997 | dst_link_failure(skb); | |
998 | tx_error: | |
66028310 | 999 | kfree_skb(skb); |
61c1db7f | 1000 | dev->stats.tx_errors++; |
6ed10654 | 1001 | return NETDEV_TX_OK; |
1da177e4 LT |
1002 | } |
1003 | ||
49dbe7ae SH |
1004 | static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
1005 | struct net_device *dev, u8 ipproto) | |
32b8a8e5 ND |
1006 | { |
1007 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1008 | const struct iphdr *tiph = &tunnel->parms.iph; | |
1009 | ||
7e13318d | 1010 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 1011 | goto tx_error; |
32b8a8e5 | 1012 | |
49dbe7ae | 1013 | skb_set_inner_ipproto(skb, ipproto); |
469471cd | 1014 | |
49dbe7ae | 1015 | ip_tunnel_xmit(skb, dev, tiph, ipproto); |
32b8a8e5 | 1016 | return NETDEV_TX_OK; |
aed069df AD |
1017 | tx_error: |
1018 | kfree_skb(skb); | |
61c1db7f ED |
1019 | dev->stats.tx_errors++; |
1020 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1021 | } |
1022 | ||
1023 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1024 | struct net_device *dev) | |
1025 | { | |
cb9f1b78 WB |
1026 | if (!pskb_inet_may_pull(skb)) |
1027 | goto tx_err; | |
1028 | ||
32b8a8e5 ND |
1029 | switch (skb->protocol) { |
1030 | case htons(ETH_P_IP): | |
49dbe7ae | 1031 | sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
32b8a8e5 ND |
1032 | break; |
1033 | case htons(ETH_P_IPV6): | |
1034 | ipip6_tunnel_xmit(skb, dev); | |
1035 | break; | |
49dbe7ae SH |
1036 | #if IS_ENABLED(CONFIG_MPLS) |
1037 | case htons(ETH_P_MPLS_UC): | |
1038 | sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); | |
1039 | break; | |
1040 | #endif | |
32b8a8e5 ND |
1041 | default: |
1042 | goto tx_err; | |
1043 | } | |
1044 | ||
1045 | return NETDEV_TX_OK; | |
1046 | ||
1047 | tx_err: | |
1048 | dev->stats.tx_errors++; | |
66028310 | 1049 | kfree_skb(skb); |
32b8a8e5 ND |
1050 | return NETDEV_TX_OK; |
1051 | ||
1052 | } | |
1053 | ||
8a4a50f9 MS |
1054 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1055 | { | |
1056 | struct net_device *tdev = NULL; | |
1057 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1058 | const struct iphdr *iph; |
31e4543d | 1059 | struct flowi4 fl4; |
8a4a50f9 MS |
1060 | |
1061 | tunnel = netdev_priv(dev); | |
1062 | iph = &tunnel->parms.iph; | |
1063 | ||
1064 | if (iph->daddr) { | |
5e6700b3 ND |
1065 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1066 | NULL, | |
78fbfd8a DM |
1067 | iph->daddr, iph->saddr, |
1068 | 0, 0, | |
1069 | IPPROTO_IPV6, | |
1070 | RT_TOS(iph->tos), | |
1071 | tunnel->parms.link); | |
b23dd4fe DM |
1072 | |
1073 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1074 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1075 | ip_rt_put(rt); |
1076 | } | |
1077 | dev->flags |= IFF_POINTOPOINT; | |
1078 | } | |
1079 | ||
1080 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1081 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 | 1082 | |
ff6ab32b | 1083 | if (tdev && !netif_is_l3_master(tdev)) { |
14909664 TH |
1084 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1085 | ||
8a4a50f9 | 1086 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
14909664 | 1087 | dev->mtu = tdev->mtu - t_hlen; |
8a4a50f9 MS |
1088 | if (dev->mtu < IPV6_MIN_MTU) |
1089 | dev->mtu = IPV6_MIN_MTU; | |
1090 | } | |
8a4a50f9 MS |
1091 | } |
1092 | ||
9830ad4c CG |
1093 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
1094 | __u32 fwmark) | |
f3723416 | 1095 | { |
5e6700b3 | 1096 | struct net *net = t->net; |
f3723416 ND |
1097 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1098 | ||
1099 | ipip6_tunnel_unlink(sitn, t); | |
1100 | synchronize_net(); | |
1101 | t->parms.iph.saddr = p->iph.saddr; | |
1102 | t->parms.iph.daddr = p->iph.daddr; | |
1103 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1104 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1105 | ipip6_tunnel_link(sitn, t); | |
1106 | t->parms.iph.ttl = p->iph.ttl; | |
1107 | t->parms.iph.tos = p->iph.tos; | |
f859b4af | 1108 | t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c | 1109 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
f3723416 | 1110 | t->parms.link = p->link; |
9830ad4c | 1111 | t->fwmark = fwmark; |
f3723416 ND |
1112 | ipip6_tunnel_bind_dev(t->dev); |
1113 | } | |
e09acddf | 1114 | dst_cache_reset(&t->dst_cache); |
f3723416 ND |
1115 | netdev_state_change(t->dev); |
1116 | } | |
1117 | ||
e2f1f072 ND |
1118 | #ifdef CONFIG_IPV6_SIT_6RD |
1119 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1120 | struct ip_tunnel_6rd *ip6rd) | |
1121 | { | |
1122 | struct in6_addr prefix; | |
1123 | __be32 relay_prefix; | |
1124 | ||
1125 | if (ip6rd->relay_prefixlen > 32 || | |
1126 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1127 | return -EINVAL; | |
1128 | ||
1129 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1130 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1131 | return -EINVAL; | |
1132 | if (ip6rd->relay_prefixlen) | |
1133 | relay_prefix = ip6rd->relay_prefix & | |
1134 | htonl(0xffffffffUL << | |
1135 | (32 - ip6rd->relay_prefixlen)); | |
1136 | else | |
1137 | relay_prefix = 0; | |
1138 | if (relay_prefix != ip6rd->relay_prefix) | |
1139 | return -EINVAL; | |
1140 | ||
1141 | t->ip6rd.prefix = prefix; | |
1142 | t->ip6rd.relay_prefix = relay_prefix; | |
1143 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1144 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
e09acddf | 1145 | dst_cache_reset(&t->dst_cache); |
e2f1f072 ND |
1146 | netdev_state_change(t->dev); |
1147 | return 0; | |
1148 | } | |
1149 | #endif | |
1150 | ||
03ff4979 | 1151 | static bool ipip6_valid_ip_proto(u8 ipproto) |
49dbe7ae SH |
1152 | { |
1153 | return ipproto == IPPROTO_IPV6 || | |
1154 | ipproto == IPPROTO_IPIP || | |
1155 | #if IS_ENABLED(CONFIG_MPLS) | |
1156 | ipproto == IPPROTO_MPLS || | |
1157 | #endif | |
1158 | ipproto == 0; | |
1159 | } | |
1160 | ||
1da177e4 | 1161 | static int |
67ba4152 | 1162 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1163 | { |
1164 | int err = 0; | |
1165 | struct ip_tunnel_parm p; | |
fadf6bf0 | 1166 | struct ip_tunnel_prl prl; |
9aad77c3 ND |
1167 | struct ip_tunnel *t = netdev_priv(dev); |
1168 | struct net *net = t->net; | |
ca8def14 | 1169 | struct sit_net *sitn = net_generic(net, sit_net_id); |
fa857afc YH |
1170 | #ifdef CONFIG_IPV6_SIT_6RD |
1171 | struct ip_tunnel_6rd ip6rd; | |
1172 | #endif | |
1da177e4 LT |
1173 | |
1174 | switch (cmd) { | |
1175 | case SIOCGETTUNNEL: | |
fa857afc YH |
1176 | #ifdef CONFIG_IPV6_SIT_6RD |
1177 | case SIOCGET6RD: | |
1178 | #endif | |
cd3dbc19 | 1179 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1180 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1181 | err = -EFAULT; | |
1182 | break; | |
1183 | } | |
ca8def14 | 1184 | t = ipip6_tunnel_locate(net, &p, 0); |
63159f29 | 1185 | if (!t) |
9aad77c3 | 1186 | t = netdev_priv(dev); |
1da177e4 | 1187 | } |
fa857afc YH |
1188 | |
1189 | err = -EFAULT; | |
1190 | if (cmd == SIOCGETTUNNEL) { | |
1191 | memcpy(&p, &t->parms, sizeof(p)); | |
1192 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1193 | sizeof(p))) | |
1194 | goto done; | |
1195 | #ifdef CONFIG_IPV6_SIT_6RD | |
1196 | } else { | |
4e3fd7a0 | 1197 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
1198 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
1199 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1200 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1201 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1202 | sizeof(ip6rd))) | |
1203 | goto done; | |
1204 | #endif | |
1205 | } | |
1206 | err = 0; | |
1da177e4 LT |
1207 | break; |
1208 | ||
1209 | case SIOCADDTUNNEL: | |
1210 | case SIOCCHGTUNNEL: | |
1211 | err = -EPERM; | |
af31f412 | 1212 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1213 | goto done; |
1214 | ||
1215 | err = -EFAULT; | |
1216 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1217 | goto done; | |
1218 | ||
1219 | err = -EINVAL; | |
49dbe7ae | 1220 | if (!ipip6_valid_ip_proto(p.iph.protocol)) |
32b8a8e5 ND |
1221 | goto done; |
1222 | if (p.iph.version != 4 || | |
1da177e4 LT |
1223 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
1224 | goto done; | |
1225 | if (p.iph.ttl) | |
1226 | p.iph.frag_off |= htons(IP_DF); | |
1227 | ||
ca8def14 | 1228 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1229 | |
cd3dbc19 | 1230 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
53b24b8f | 1231 | if (t) { |
1da177e4 LT |
1232 | if (t->dev != dev) { |
1233 | err = -EEXIST; | |
1234 | break; | |
1235 | } | |
1236 | } else { | |
1237 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1238 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1239 | err = -EINVAL; | |
1240 | break; | |
1241 | } | |
2941a486 | 1242 | t = netdev_priv(dev); |
1da177e4 | 1243 | } |
f9cd5a55 | 1244 | |
9830ad4c | 1245 | ipip6_tunnel_update(t, &p, t->fwmark); |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | if (t) { | |
1249 | err = 0; | |
1da177e4 LT |
1250 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1251 | err = -EFAULT; | |
1252 | } else | |
1253 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1254 | break; | |
1255 | ||
1256 | case SIOCDELTUNNEL: | |
1257 | err = -EPERM; | |
af31f412 | 1258 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1259 | goto done; |
1260 | ||
cd3dbc19 | 1261 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1262 | err = -EFAULT; |
1263 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1264 | goto done; | |
1265 | err = -ENOENT; | |
e5d08d71 | 1266 | t = ipip6_tunnel_locate(net, &p, 0); |
63159f29 | 1267 | if (!t) |
1da177e4 LT |
1268 | goto done; |
1269 | err = -EPERM; | |
cd3dbc19 | 1270 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1271 | goto done; |
1272 | dev = t->dev; | |
1273 | } | |
22f8cde5 SH |
1274 | unregister_netdevice(dev); |
1275 | err = 0; | |
1da177e4 LT |
1276 | break; |
1277 | ||
300aaeea | 1278 | case SIOCGETPRL: |
2b4743bd YH |
1279 | err = -EINVAL; |
1280 | if (dev == sitn->fb_tunnel_dev) | |
1281 | goto done; | |
2b4743bd YH |
1282 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); |
1283 | break; | |
1284 | ||
fadf6bf0 TF |
1285 | case SIOCADDPRL: |
1286 | case SIOCDELPRL: | |
1287 | case SIOCCHGPRL: | |
1288 | err = -EPERM; | |
af31f412 | 1289 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fadf6bf0 TF |
1290 | goto done; |
1291 | err = -EINVAL; | |
cd3dbc19 | 1292 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1293 | goto done; |
1294 | err = -EFAULT; | |
1295 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1296 | goto done; | |
fadf6bf0 | 1297 | |
300aaeea | 1298 | switch (cmd) { |
300aaeea | 1299 | case SIOCDELPRL: |
fadf6bf0 | 1300 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1301 | break; |
1302 | case SIOCADDPRL: | |
1303 | case SIOCCHGPRL: | |
fadf6bf0 | 1304 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1305 | break; |
1306 | } | |
e09acddf | 1307 | dst_cache_reset(&t->dst_cache); |
2b4743bd | 1308 | netdev_state_change(dev); |
fadf6bf0 TF |
1309 | break; |
1310 | ||
fa857afc YH |
1311 | #ifdef CONFIG_IPV6_SIT_6RD |
1312 | case SIOCADD6RD: | |
1313 | case SIOCCHG6RD: | |
1314 | case SIOCDEL6RD: | |
1315 | err = -EPERM; | |
af31f412 | 1316 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fa857afc YH |
1317 | goto done; |
1318 | ||
1319 | err = -EFAULT; | |
1320 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1321 | sizeof(ip6rd))) | |
1322 | goto done; | |
1323 | ||
fa857afc | 1324 | if (cmd != SIOCDEL6RD) { |
e2f1f072 ND |
1325 | err = ipip6_tunnel_update_6rd(t, &ip6rd); |
1326 | if (err < 0) | |
fa857afc | 1327 | goto done; |
fa857afc | 1328 | } else |
e0c93948 | 1329 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1330 | |
1331 | err = 0; | |
1332 | break; | |
1333 | #endif | |
1334 | ||
1da177e4 LT |
1335 | default: |
1336 | err = -EINVAL; | |
1337 | } | |
1338 | ||
1339 | done: | |
1340 | return err; | |
1341 | } | |
1342 | ||
1326c3d5 | 1343 | static const struct net_device_ops ipip6_netdev_ops = { |
ebe084aa | 1344 | .ndo_init = ipip6_tunnel_init, |
1326c3d5 | 1345 | .ndo_uninit = ipip6_tunnel_uninit, |
32b8a8e5 | 1346 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 | 1347 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
f61dd388 | 1348 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1e99584b | 1349 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1326c3d5 SH |
1350 | }; |
1351 | ||
15fc1f70 ED |
1352 | static void ipip6_dev_free(struct net_device *dev) |
1353 | { | |
cf71d2bc ND |
1354 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1355 | ||
e09acddf | 1356 | dst_cache_destroy(&tunnel->dst_cache); |
15fc1f70 | 1357 | free_percpu(dev->tstats); |
15fc1f70 ED |
1358 | } |
1359 | ||
61c1db7f ED |
1360 | #define SIT_FEATURES (NETIF_F_SG | \ |
1361 | NETIF_F_FRAGLIST | \ | |
1362 | NETIF_F_HIGHDMA | \ | |
1363 | NETIF_F_GSO_SOFTWARE | \ | |
1364 | NETIF_F_HW_CSUM) | |
1365 | ||
1da177e4 LT |
1366 | static void ipip6_tunnel_setup(struct net_device *dev) |
1367 | { | |
14909664 TH |
1368 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1369 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1370 | ||
1326c3d5 | 1371 | dev->netdev_ops = &ipip6_netdev_ops; |
cf124db5 DM |
1372 | dev->needs_free_netdev = true; |
1373 | dev->priv_destructor = ipip6_dev_free; | |
1da177e4 LT |
1374 | |
1375 | dev->type = ARPHRD_SIT; | |
14909664 TH |
1376 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
1377 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
b96f9afe | 1378 | dev->min_mtu = IPV6_MIN_MTU; |
f7ff1fde | 1379 | dev->max_mtu = IP6_MAX_MTU - t_hlen; |
1da177e4 | 1380 | dev->flags = IFF_NOARP; |
02875878 | 1381 | netif_keep_dst(dev); |
1da177e4 | 1382 | dev->addr_len = 4; |
8df40d10 | 1383 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1384 | dev->features |= SIT_FEATURES; |
1385 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1386 | } |
1387 | ||
15fc1f70 | 1388 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1389 | { |
1326c3d5 | 1390 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e09acddf | 1391 | int err; |
1da177e4 LT |
1392 | |
1393 | tunnel->dev = dev; | |
5e6700b3 | 1394 | tunnel->net = dev_net(dev); |
ebe084aa | 1395 | strcpy(tunnel->parms.name, dev->name); |
1da177e4 | 1396 | |
8a4a50f9 | 1397 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1398 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1399 | if (!dev->tstats) |
1400 | return -ENOMEM; | |
1401 | ||
e09acddf PA |
1402 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1403 | if (err) { | |
cf71d2bc | 1404 | free_percpu(dev->tstats); |
d7426c69 | 1405 | dev->tstats = NULL; |
e09acddf | 1406 | return err; |
cf71d2bc ND |
1407 | } |
1408 | ||
15fc1f70 | 1409 | return 0; |
1da177e4 LT |
1410 | } |
1411 | ||
4ece9009 | 1412 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1413 | { |
2941a486 | 1414 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1415 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1416 | struct net *net = dev_net(dev); |
1417 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 | 1418 | |
1da177e4 LT |
1419 | iph->version = 4; |
1420 | iph->protocol = IPPROTO_IPV6; | |
1421 | iph->ihl = 5; | |
1422 | iph->ttl = 64; | |
1423 | ||
1424 | dev_hold(dev); | |
cf778b00 | 1425 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
1da177e4 LT |
1426 | } |
1427 | ||
a8b8a889 MS |
1428 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
1429 | struct netlink_ext_ack *extack) | |
32b8a8e5 ND |
1430 | { |
1431 | u8 proto; | |
1432 | ||
c2ff682a | 1433 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1434 | return 0; |
1435 | ||
1436 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
49dbe7ae | 1437 | if (!ipip6_valid_ip_proto(proto)) |
32b8a8e5 ND |
1438 | return -EINVAL; |
1439 | ||
1440 | return 0; | |
1441 | } | |
1442 | ||
f3723416 | 1443 | static void ipip6_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
1444 | struct ip_tunnel_parm *parms, |
1445 | __u32 *fwmark) | |
f3723416 ND |
1446 | { |
1447 | memset(parms, 0, sizeof(*parms)); | |
1448 | ||
1449 | parms->iph.version = 4; | |
1450 | parms->iph.protocol = IPPROTO_IPV6; | |
1451 | parms->iph.ihl = 5; | |
1452 | parms->iph.ttl = 64; | |
1453 | ||
1454 | if (!data) | |
1455 | return; | |
1456 | ||
1457 | if (data[IFLA_IPTUN_LINK]) | |
1458 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1459 | ||
1460 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1461 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1462 | |
1463 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1464 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1465 | |
1466 | if (data[IFLA_IPTUN_TTL]) { | |
1467 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1468 | if (parms->iph.ttl) | |
1469 | parms->iph.frag_off = htons(IP_DF); | |
1470 | } | |
1471 | ||
1472 | if (data[IFLA_IPTUN_TOS]) | |
1473 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1474 | ||
1475 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1476 | parms->iph.frag_off = htons(IP_DF); | |
1477 | ||
1478 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1479 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1480 | |
1481 | if (data[IFLA_IPTUN_PROTO]) | |
1482 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1483 | ||
9830ad4c CG |
1484 | if (data[IFLA_IPTUN_FWMARK]) |
1485 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
f3723416 ND |
1486 | } |
1487 | ||
14909664 TH |
1488 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1489 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1490 | struct ip_tunnel_encap *ipencap) | |
1491 | { | |
1492 | bool ret = false; | |
1493 | ||
1494 | memset(ipencap, 0, sizeof(*ipencap)); | |
1495 | ||
1496 | if (!data) | |
1497 | return ret; | |
1498 | ||
1499 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1500 | ret = true; | |
1501 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1502 | } | |
1503 | ||
1504 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1505 | ret = true; | |
1506 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1507 | } | |
1508 | ||
1509 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1510 | ret = true; | |
a409caec | 1511 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
14909664 TH |
1512 | } |
1513 | ||
1514 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1515 | ret = true; | |
a409caec | 1516 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
14909664 TH |
1517 | } |
1518 | ||
1519 | return ret; | |
1520 | } | |
1521 | ||
e2f1f072 ND |
1522 | #ifdef CONFIG_IPV6_SIT_6RD |
1523 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1524 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1525 | struct ip_tunnel_6rd *ip6rd) | |
1526 | { | |
1527 | bool ret = false; | |
1528 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1529 | ||
1530 | if (!data) | |
1531 | return ret; | |
1532 | ||
1533 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1534 | ret = true; | |
67b61f6c | 1535 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
e2f1f072 ND |
1536 | } |
1537 | ||
1538 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1539 | ret = true; | |
1540 | ip6rd->relay_prefix = | |
1541 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1542 | } | |
1543 | ||
1544 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1545 | ret = true; | |
1546 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1547 | } | |
1548 | ||
1549 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1550 | ret = true; | |
1551 | ip6rd->relay_prefixlen = | |
1552 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1553 | } | |
1554 | ||
1555 | return ret; | |
1556 | } | |
1557 | #endif | |
1558 | ||
f3723416 | 1559 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1560 | struct nlattr *tb[], struct nlattr *data[], |
1561 | struct netlink_ext_ack *extack) | |
f3723416 ND |
1562 | { |
1563 | struct net *net = dev_net(dev); | |
1564 | struct ip_tunnel *nt; | |
14909664 | 1565 | struct ip_tunnel_encap ipencap; |
e2f1f072 ND |
1566 | #ifdef CONFIG_IPV6_SIT_6RD |
1567 | struct ip_tunnel_6rd ip6rd; | |
1568 | #endif | |
1569 | int err; | |
f3723416 ND |
1570 | |
1571 | nt = netdev_priv(dev); | |
14909664 TH |
1572 | |
1573 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1574 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1575 | if (err < 0) | |
1576 | return err; | |
1577 | } | |
1578 | ||
9830ad4c | 1579 | ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
f3723416 ND |
1580 | |
1581 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1582 | return -EEXIST; | |
1583 | ||
e2f1f072 ND |
1584 | err = ipip6_tunnel_create(dev); |
1585 | if (err < 0) | |
1586 | return err; | |
1587 | ||
2b3957c3 XL |
1588 | if (tb[IFLA_MTU]) { |
1589 | u32 mtu = nla_get_u32(tb[IFLA_MTU]); | |
1590 | ||
f7ff1fde ND |
1591 | if (mtu >= IPV6_MIN_MTU && |
1592 | mtu <= IP6_MAX_MTU - dev->hard_header_len) | |
2b3957c3 XL |
1593 | dev->mtu = mtu; |
1594 | } | |
1595 | ||
e2f1f072 ND |
1596 | #ifdef CONFIG_IPV6_SIT_6RD |
1597 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1598 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1599 | #endif | |
1600 | ||
1601 | return err; | |
f3723416 ND |
1602 | } |
1603 | ||
1604 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
1605 | struct nlattr *data[], |
1606 | struct netlink_ext_ack *extack) | |
f3723416 | 1607 | { |
86bd68bf | 1608 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1609 | struct ip_tunnel_parm p; |
14909664 | 1610 | struct ip_tunnel_encap ipencap; |
86bd68bf | 1611 | struct net *net = t->net; |
f3723416 | 1612 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1613 | #ifdef CONFIG_IPV6_SIT_6RD |
1614 | struct ip_tunnel_6rd ip6rd; | |
1615 | #endif | |
9830ad4c | 1616 | __u32 fwmark = t->fwmark; |
14909664 | 1617 | int err; |
f3723416 ND |
1618 | |
1619 | if (dev == sitn->fb_tunnel_dev) | |
1620 | return -EINVAL; | |
1621 | ||
14909664 TH |
1622 | if (ipip6_netlink_encap_parms(data, &ipencap)) { |
1623 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1624 | if (err < 0) | |
1625 | return err; | |
1626 | } | |
1627 | ||
9830ad4c | 1628 | ipip6_netlink_parms(data, &p, &fwmark); |
f3723416 ND |
1629 | |
1630 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1631 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1632 | return -EINVAL; | |
1633 | ||
1634 | t = ipip6_tunnel_locate(net, &p, 0); | |
1635 | ||
1636 | if (t) { | |
1637 | if (t->dev != dev) | |
1638 | return -EEXIST; | |
1639 | } else | |
1640 | t = netdev_priv(dev); | |
1641 | ||
9830ad4c | 1642 | ipip6_tunnel_update(t, &p, fwmark); |
e2f1f072 ND |
1643 | |
1644 | #ifdef CONFIG_IPV6_SIT_6RD | |
1645 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1646 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1647 | #endif | |
1648 | ||
f3723416 ND |
1649 | return 0; |
1650 | } | |
1651 | ||
e4c94a9c | 1652 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1653 | { |
1654 | return | |
1655 | /* IFLA_IPTUN_LINK */ | |
1656 | nla_total_size(4) + | |
1657 | /* IFLA_IPTUN_LOCAL */ | |
1658 | nla_total_size(4) + | |
1659 | /* IFLA_IPTUN_REMOTE */ | |
1660 | nla_total_size(4) + | |
1661 | /* IFLA_IPTUN_TTL */ | |
1662 | nla_total_size(1) + | |
1663 | /* IFLA_IPTUN_TOS */ | |
1664 | nla_total_size(1) + | |
a12c9a85 ND |
1665 | /* IFLA_IPTUN_PMTUDISC */ |
1666 | nla_total_size(1) + | |
1667 | /* IFLA_IPTUN_FLAGS */ | |
1668 | nla_total_size(2) + | |
32b8a8e5 ND |
1669 | /* IFLA_IPTUN_PROTO */ |
1670 | nla_total_size(1) + | |
e2f1f072 ND |
1671 | #ifdef CONFIG_IPV6_SIT_6RD |
1672 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1673 | nla_total_size(sizeof(struct in6_addr)) + | |
1674 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1675 | nla_total_size(4) + | |
1676 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1677 | nla_total_size(2) + | |
1678 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1679 | nla_total_size(2) + | |
1680 | #endif | |
14909664 TH |
1681 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1682 | nla_total_size(2) + | |
1683 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1684 | nla_total_size(2) + | |
1685 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1686 | nla_total_size(2) + | |
1687 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1688 | nla_total_size(2) + | |
9830ad4c CG |
1689 | /* IFLA_IPTUN_FWMARK */ |
1690 | nla_total_size(4) + | |
ba3e3f50 ND |
1691 | 0; |
1692 | } | |
1693 | ||
e4c94a9c | 1694 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1695 | { |
1696 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1697 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1698 | ||
1699 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1700 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
1701 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
ba3e3f50 | 1702 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
a12c9a85 ND |
1703 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1704 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1705 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1706 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
9830ad4c CG |
1707 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
1708 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
ba3e3f50 | 1709 | goto nla_put_failure; |
e2f1f072 ND |
1710 | |
1711 | #ifdef CONFIG_IPV6_SIT_6RD | |
930345ea JB |
1712 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
1713 | &tunnel->ip6rd.prefix) || | |
1714 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1715 | tunnel->ip6rd.relay_prefix) || | |
e2f1f072 ND |
1716 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
1717 | tunnel->ip6rd.prefixlen) || | |
1718 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1719 | tunnel->ip6rd.relay_prefixlen)) | |
1720 | goto nla_put_failure; | |
1721 | #endif | |
1722 | ||
14909664 TH |
1723 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
1724 | tunnel->encap.type) || | |
a409caec | 1725 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
14909664 | 1726 | tunnel->encap.sport) || |
a409caec | 1727 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
14909664 TH |
1728 | tunnel->encap.dport) || |
1729 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
e1b2cb65 | 1730 | tunnel->encap.flags)) |
14909664 TH |
1731 | goto nla_put_failure; |
1732 | ||
ba3e3f50 ND |
1733 | return 0; |
1734 | ||
1735 | nla_put_failure: | |
1736 | return -EMSGSIZE; | |
1737 | } | |
1738 | ||
f3723416 ND |
1739 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1740 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1741 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1742 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1743 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1744 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1745 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1746 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1747 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1748 | #ifdef CONFIG_IPV6_SIT_6RD |
1749 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1750 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1751 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1752 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1753 | #endif | |
14909664 TH |
1754 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1755 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1756 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1757 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
9830ad4c | 1758 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
f3723416 ND |
1759 | }; |
1760 | ||
9434266f WB |
1761 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1762 | { | |
1763 | struct net *net = dev_net(dev); | |
1764 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1765 | ||
1766 | if (dev != sitn->fb_tunnel_dev) | |
1767 | unregister_netdevice_queue(dev, head); | |
1768 | } | |
1769 | ||
ba3e3f50 ND |
1770 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1771 | .kind = "sit", | |
1772 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1773 | .policy = ipip6_policy, |
ba3e3f50 | 1774 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1775 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1776 | .validate = ipip6_validate, |
f3723416 ND |
1777 | .newlink = ipip6_newlink, |
1778 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1779 | .get_size = ipip6_get_size, |
1780 | .fill_info = ipip6_fill_info, | |
9434266f | 1781 | .dellink = ipip6_dellink, |
1728d4fa | 1782 | .get_link_net = ip_tunnel_get_link_net, |
ba3e3f50 ND |
1783 | }; |
1784 | ||
6dcd814b | 1785 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1786 | .handler = ipip6_rcv, |
1787 | .err_handler = ipip6_err, | |
c73cb5a2 | 1788 | .priority = 1, |
1da177e4 LT |
1789 | }; |
1790 | ||
32b8a8e5 ND |
1791 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1792 | .handler = ipip_rcv, | |
1793 | .err_handler = ipip6_err, | |
1794 | .priority = 2, | |
1795 | }; | |
1796 | ||
49dbe7ae SH |
1797 | #if IS_ENABLED(CONFIG_MPLS) |
1798 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
1799 | .handler = mplsip_rcv, | |
1800 | .err_handler = ipip6_err, | |
1801 | .priority = 2, | |
1802 | }; | |
1803 | #endif | |
1804 | ||
9434266f WB |
1805 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1806 | struct list_head *head) | |
db44575f | 1807 | { |
9434266f | 1808 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1809 | struct net_device *dev, *aux; |
db44575f AK |
1810 | int prio; |
1811 | ||
5e6700b3 ND |
1812 | for_each_netdev_safe(net, dev, aux) |
1813 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1814 | unregister_netdevice_queue(dev, head); | |
1815 | ||
db44575f AK |
1816 | for (prio = 1; prio < 4; prio++) { |
1817 | int h; | |
e87a8f24 | 1818 | for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { |
753ea8e9 | 1819 | struct ip_tunnel *t; |
62808f91 | 1820 | |
753ea8e9 | 1821 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
53b24b8f | 1822 | while (t) { |
5e6700b3 ND |
1823 | /* If dev is in the same netns, it has already |
1824 | * been added to the list by the previous loop. | |
1825 | */ | |
fc8f999d | 1826 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1827 | unregister_netdevice_queue(t->dev, |
1828 | head); | |
753ea8e9 | 1829 | t = rtnl_dereference(t->next); |
62808f91 | 1830 | } |
db44575f AK |
1831 | } |
1832 | } | |
1833 | } | |
1834 | ||
2c8c1e72 | 1835 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1836 | { |
67101172 | 1837 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1838 | struct ip_tunnel *t; |
8190d900 | 1839 | int err; |
8190d900 | 1840 | |
29182176 PE |
1841 | sitn->tunnels[0] = sitn->tunnels_wc; |
1842 | sitn->tunnels[1] = sitn->tunnels_l; | |
1843 | sitn->tunnels[2] = sitn->tunnels_r; | |
1844 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1845 | ||
79134e6c ED |
1846 | if (!net_has_fallback_tunnels(net)) |
1847 | return 0; | |
1848 | ||
cd3dbc19 | 1849 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1850 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1851 | ipip6_tunnel_setup); |
1852 | if (!sitn->fb_tunnel_dev) { | |
1853 | err = -ENOMEM; | |
1854 | goto err_alloc_dev; | |
1855 | } | |
be77e593 | 1856 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1857 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1858 | /* FB netdevice is special: we have one, and only one per netns. |
1859 | * Allowing to move it to another netns is clearly unsafe. | |
1860 | */ | |
1861 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1862 | |
e5d08d71 IM |
1863 | err = register_netdev(sitn->fb_tunnel_dev); |
1864 | if (err) | |
cd3dbc19 PE |
1865 | goto err_reg_dev; |
1866 | ||
4ece9009 ED |
1867 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
1868 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1869 | ||
72b36015 TF |
1870 | t = netdev_priv(sitn->fb_tunnel_dev); |
1871 | ||
1872 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1873 | return 0; |
1874 | ||
cd3dbc19 | 1875 | err_reg_dev: |
dd4080ee | 1876 | ipip6_dev_free(sitn->fb_tunnel_dev); |
07f12b26 | 1877 | free_netdev(sitn->fb_tunnel_dev); |
cd3dbc19 | 1878 | err_alloc_dev: |
8190d900 PE |
1879 | return err; |
1880 | } | |
1881 | ||
bb401cae | 1882 | static void __net_exit sit_exit_batch_net(struct list_head *net_list) |
8190d900 | 1883 | { |
62808f91 | 1884 | LIST_HEAD(list); |
bb401cae | 1885 | struct net *net; |
8190d900 | 1886 | |
cd3dbc19 | 1887 | rtnl_lock(); |
bb401cae ED |
1888 | list_for_each_entry(net, net_list, exit_list) |
1889 | sit_destroy_tunnels(net, &list); | |
1890 | ||
62808f91 | 1891 | unregister_netdevice_many(&list); |
cd3dbc19 | 1892 | rtnl_unlock(); |
8190d900 PE |
1893 | } |
1894 | ||
1895 | static struct pernet_operations sit_net_ops = { | |
1896 | .init = sit_init_net, | |
bb401cae | 1897 | .exit_batch = sit_exit_batch_net, |
67101172 EB |
1898 | .id = &sit_net_id, |
1899 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1900 | }; |
1901 | ||
89c89458 | 1902 | static void __exit sit_cleanup(void) |
1da177e4 | 1903 | { |
ba3e3f50 | 1904 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1905 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1906 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
49dbe7ae SH |
1907 | #if IS_ENABLED(CONFIG_MPLS) |
1908 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1909 | #endif | |
db44575f | 1910 | |
67101172 | 1911 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1912 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1913 | } |
1914 | ||
89c89458 | 1915 | static int __init sit_init(void) |
1da177e4 LT |
1916 | { |
1917 | int err; | |
1918 | ||
49dbe7ae | 1919 | pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 1920 | |
67101172 | 1921 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1922 | if (err < 0) |
d5aa407f AD |
1923 | return err; |
1924 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1925 | if (err < 0) { | |
32b8a8e5 | 1926 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1927 | goto xfrm_tunnel_failed; |
d5aa407f | 1928 | } |
32b8a8e5 ND |
1929 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1930 | if (err < 0) { | |
1931 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1932 | goto xfrm_tunnel4_failed; | |
1933 | } | |
49dbe7ae SH |
1934 | #if IS_ENABLED(CONFIG_MPLS) |
1935 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
1936 | if (err < 0) { | |
1937 | pr_info("%s: can't register mplsip\n", __func__); | |
1938 | goto xfrm_tunnel_mpls_failed; | |
1939 | } | |
1940 | #endif | |
ba3e3f50 ND |
1941 | err = rtnl_link_register(&sit_link_ops); |
1942 | if (err < 0) | |
1943 | goto rtnl_link_failed; | |
1944 | ||
1945 | out: | |
1da177e4 | 1946 | return err; |
ba3e3f50 ND |
1947 | |
1948 | rtnl_link_failed: | |
49dbe7ae SH |
1949 | #if IS_ENABLED(CONFIG_MPLS) |
1950 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1951 | xfrm_tunnel_mpls_failed: | |
1952 | #endif | |
32b8a8e5 ND |
1953 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
1954 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
1955 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1956 | xfrm_tunnel_failed: | |
1957 | unregister_pernet_device(&sit_net_ops); | |
1958 | goto out; | |
1da177e4 | 1959 | } |
989e5b96 JR |
1960 | |
1961 | module_init(sit_init); | |
1962 | module_exit(sit_cleanup); | |
39c85086 | 1963 | MODULE_LICENSE("GPL"); |
f98f89a0 | 1964 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 1965 | MODULE_ALIAS_NETDEV("sit0"); |