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1 | /* | |
2 | * Linux NET3: IP/IP protocol decoder. | |
3 | * | |
4 | * Authors: | |
5 | * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
6 | * | |
7 | * Fixes: | |
8 | * Alan Cox : Merged and made usable non modular (its so tiny its silly as | |
9 | * a module taking up 2 pages). | |
10 | * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) | |
11 | * to keep ip_forward happy. | |
12 | * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). | |
13 | * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL | |
14 | * David Woodhouse : Perform some basic ICMP handling. | |
15 | * IPIP Routing without decapsulation. | |
16 | * Carlos Picoto : GRE over IP support | |
17 | * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. | |
18 | * I do not want to merge them together. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | * | |
25 | */ | |
26 | ||
27 | /* tunnel.c: an IP tunnel driver | |
28 | ||
29 | The purpose of this driver is to provide an IP tunnel through | |
30 | which you can tunnel network traffic transparently across subnets. | |
31 | ||
32 | This was written by looking at Nick Holloway's dummy driver | |
33 | Thanks for the great code! | |
34 | ||
35 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
36 | ||
37 | Minor tweaks: | |
38 | Cleaned up the code a little and added some pre-1.3.0 tweaks. | |
39 | dev->hard_header/hard_header_len changed to use no headers. | |
40 | Comments/bracketing tweaked. | |
41 | Made the tunnels use dev->name not tunnel: when error reporting. | |
42 | Added tx_dropped stat | |
43 | ||
44 | -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 | |
45 | ||
46 | Reworked: | |
47 | Changed to tunnel to destination gateway in addition to the | |
48 | tunnel's pointopoint address | |
49 | Almost completely rewritten | |
50 | Note: There is currently no firewall or ICMP handling done. | |
51 | ||
52 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 | |
53 | ||
54 | */ | |
55 | ||
56 | /* Things I wish I had known when writing the tunnel driver: | |
57 | ||
58 | When the tunnel_xmit() function is called, the skb contains the | |
59 | packet to be sent (plus a great deal of extra info), and dev | |
60 | contains the tunnel device that _we_ are. | |
61 | ||
62 | When we are passed a packet, we are expected to fill in the | |
63 | source address with our source IP address. | |
64 | ||
65 | What is the proper way to allocate, copy and free a buffer? | |
66 | After you allocate it, it is a "0 length" chunk of memory | |
67 | starting at zero. If you want to add headers to the buffer | |
68 | later, you'll have to call "skb_reserve(skb, amount)" with | |
69 | the amount of memory you want reserved. Then, you call | |
70 | "skb_put(skb, amount)" with the amount of space you want in | |
71 | the buffer. skb_put() returns a pointer to the top (#0) of | |
72 | that buffer. skb->len is set to the amount of space you have | |
73 | "allocated" with skb_put(). You can then write up to skb->len | |
74 | bytes to that buffer. If you need more, you can call skb_put() | |
75 | again with the additional amount of space you need. You can | |
76 | find out how much more space you can allocate by calling | |
77 | "skb_tailroom(skb)". | |
78 | Now, to add header space, call "skb_push(skb, header_len)". | |
79 | This creates space at the beginning of the buffer and returns | |
80 | a pointer to this new space. If later you need to strip a | |
81 | header from a buffer, call "skb_pull(skb, header_len)". | |
82 | skb_headroom() will return how much space is left at the top | |
83 | of the buffer (before the main data). Remember, this headroom | |
84 | space must be reserved before the skb_put() function is called. | |
85 | */ | |
86 | ||
87 | /* | |
88 | This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c | |
89 | ||
90 | For comments look at net/ipv4/ip_gre.c --ANK | |
91 | */ | |
92 | ||
93 | ||
94 | #include <linux/capability.h> | |
95 | #include <linux/module.h> | |
96 | #include <linux/types.h> | |
97 | #include <linux/kernel.h> | |
98 | #include <linux/slab.h> | |
99 | #include <asm/uaccess.h> | |
100 | #include <linux/skbuff.h> | |
101 | #include <linux/netdevice.h> | |
102 | #include <linux/in.h> | |
103 | #include <linux/tcp.h> | |
104 | #include <linux/udp.h> | |
105 | #include <linux/if_arp.h> | |
106 | #include <linux/mroute.h> | |
107 | #include <linux/init.h> | |
108 | #include <linux/netfilter_ipv4.h> | |
109 | #include <linux/if_ether.h> | |
110 | ||
111 | #include <net/sock.h> | |
112 | #include <net/ip.h> | |
113 | #include <net/icmp.h> | |
114 | #include <net/ipip.h> | |
115 | #include <net/inet_ecn.h> | |
116 | #include <net/xfrm.h> | |
117 | #include <net/net_namespace.h> | |
118 | #include <net/netns/generic.h> | |
119 | ||
120 | #define HASH_SIZE 16 | |
121 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) | |
122 | ||
123 | static int ipip_net_id __read_mostly; | |
124 | struct ipip_net { | |
125 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; | |
126 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
127 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
128 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
129 | struct ip_tunnel __rcu **tunnels[4]; | |
130 | ||
131 | struct net_device *fb_tunnel_dev; | |
132 | }; | |
133 | ||
134 | static int ipip_tunnel_init(struct net_device *dev); | |
135 | static void ipip_tunnel_setup(struct net_device *dev); | |
136 | static void ipip_dev_free(struct net_device *dev); | |
137 | ||
138 | /* | |
139 | * Locking : hash tables are protected by RCU and RTNL | |
140 | */ | |
141 | ||
142 | #define for_each_ip_tunnel_rcu(start) \ | |
143 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
144 | ||
145 | /* often modified stats are per cpu, other are shared (netdev->stats) */ | |
146 | struct pcpu_tstats { | |
147 | unsigned long rx_packets; | |
148 | unsigned long rx_bytes; | |
149 | unsigned long tx_packets; | |
150 | unsigned long tx_bytes; | |
151 | } __attribute__((aligned(4*sizeof(unsigned long)))); | |
152 | ||
153 | static struct net_device_stats *ipip_get_stats(struct net_device *dev) | |
154 | { | |
155 | struct pcpu_tstats sum = { 0 }; | |
156 | int i; | |
157 | ||
158 | for_each_possible_cpu(i) { | |
159 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
160 | ||
161 | sum.rx_packets += tstats->rx_packets; | |
162 | sum.rx_bytes += tstats->rx_bytes; | |
163 | sum.tx_packets += tstats->tx_packets; | |
164 | sum.tx_bytes += tstats->tx_bytes; | |
165 | } | |
166 | dev->stats.rx_packets = sum.rx_packets; | |
167 | dev->stats.rx_bytes = sum.rx_bytes; | |
168 | dev->stats.tx_packets = sum.tx_packets; | |
169 | dev->stats.tx_bytes = sum.tx_bytes; | |
170 | return &dev->stats; | |
171 | } | |
172 | ||
173 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, | |
174 | __be32 remote, __be32 local) | |
175 | { | |
176 | unsigned int h0 = HASH(remote); | |
177 | unsigned int h1 = HASH(local); | |
178 | struct ip_tunnel *t; | |
179 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
180 | ||
181 | for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) | |
182 | if (local == t->parms.iph.saddr && | |
183 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
184 | return t; | |
185 | ||
186 | for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) | |
187 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
188 | return t; | |
189 | ||
190 | for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) | |
191 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) | |
192 | return t; | |
193 | ||
194 | t = rcu_dereference(ipn->tunnels_wc[0]); | |
195 | if (t && (t->dev->flags&IFF_UP)) | |
196 | return t; | |
197 | return NULL; | |
198 | } | |
199 | ||
200 | static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, | |
201 | struct ip_tunnel_parm *parms) | |
202 | { | |
203 | __be32 remote = parms->iph.daddr; | |
204 | __be32 local = parms->iph.saddr; | |
205 | unsigned int h = 0; | |
206 | int prio = 0; | |
207 | ||
208 | if (remote) { | |
209 | prio |= 2; | |
210 | h ^= HASH(remote); | |
211 | } | |
212 | if (local) { | |
213 | prio |= 1; | |
214 | h ^= HASH(local); | |
215 | } | |
216 | return &ipn->tunnels[prio][h]; | |
217 | } | |
218 | ||
219 | static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, | |
220 | struct ip_tunnel *t) | |
221 | { | |
222 | return __ipip_bucket(ipn, &t->parms); | |
223 | } | |
224 | ||
225 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) | |
226 | { | |
227 | struct ip_tunnel __rcu **tp; | |
228 | struct ip_tunnel *iter; | |
229 | ||
230 | for (tp = ipip_bucket(ipn, t); | |
231 | (iter = rtnl_dereference(*tp)) != NULL; | |
232 | tp = &iter->next) { | |
233 | if (t == iter) { | |
234 | RCU_INIT_POINTER(*tp, t->next); | |
235 | break; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) | |
241 | { | |
242 | struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); | |
243 | ||
244 | RCU_INIT_POINTER(t->next, rtnl_dereference(*tp)); | |
245 | RCU_INIT_POINTER(*tp, t); | |
246 | } | |
247 | ||
248 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, | |
249 | struct ip_tunnel_parm *parms, int create) | |
250 | { | |
251 | __be32 remote = parms->iph.daddr; | |
252 | __be32 local = parms->iph.saddr; | |
253 | struct ip_tunnel *t, *nt; | |
254 | struct ip_tunnel __rcu **tp; | |
255 | struct net_device *dev; | |
256 | char name[IFNAMSIZ]; | |
257 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
258 | ||
259 | for (tp = __ipip_bucket(ipn, parms); | |
260 | (t = rtnl_dereference(*tp)) != NULL; | |
261 | tp = &t->next) { | |
262 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) | |
263 | return t; | |
264 | } | |
265 | if (!create) | |
266 | return NULL; | |
267 | ||
268 | if (parms->name[0]) | |
269 | strlcpy(name, parms->name, IFNAMSIZ); | |
270 | else | |
271 | strcpy(name, "tunl%d"); | |
272 | ||
273 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
274 | if (dev == NULL) | |
275 | return NULL; | |
276 | ||
277 | dev_net_set(dev, net); | |
278 | ||
279 | nt = netdev_priv(dev); | |
280 | nt->parms = *parms; | |
281 | ||
282 | if (ipip_tunnel_init(dev) < 0) | |
283 | goto failed_free; | |
284 | ||
285 | if (register_netdevice(dev) < 0) | |
286 | goto failed_free; | |
287 | ||
288 | strcpy(nt->parms.name, dev->name); | |
289 | ||
290 | dev_hold(dev); | |
291 | ipip_tunnel_link(ipn, nt); | |
292 | return nt; | |
293 | ||
294 | failed_free: | |
295 | ipip_dev_free(dev); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | /* called with RTNL */ | |
300 | static void ipip_tunnel_uninit(struct net_device *dev) | |
301 | { | |
302 | struct net *net = dev_net(dev); | |
303 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
304 | ||
305 | if (dev == ipn->fb_tunnel_dev) | |
306 | RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL); | |
307 | else | |
308 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); | |
309 | dev_put(dev); | |
310 | } | |
311 | ||
312 | static int ipip_err(struct sk_buff *skb, u32 info) | |
313 | { | |
314 | ||
315 | /* All the routers (except for Linux) return only | |
316 | 8 bytes of packet payload. It means, that precise relaying of | |
317 | ICMP in the real Internet is absolutely infeasible. | |
318 | */ | |
319 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
320 | const int type = icmp_hdr(skb)->type; | |
321 | const int code = icmp_hdr(skb)->code; | |
322 | struct ip_tunnel *t; | |
323 | int err; | |
324 | ||
325 | switch (type) { | |
326 | default: | |
327 | case ICMP_PARAMETERPROB: | |
328 | return 0; | |
329 | ||
330 | case ICMP_DEST_UNREACH: | |
331 | switch (code) { | |
332 | case ICMP_SR_FAILED: | |
333 | case ICMP_PORT_UNREACH: | |
334 | /* Impossible event. */ | |
335 | return 0; | |
336 | case ICMP_FRAG_NEEDED: | |
337 | /* Soft state for pmtu is maintained by IP core. */ | |
338 | return 0; | |
339 | default: | |
340 | /* All others are translated to HOST_UNREACH. | |
341 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
342 | I believe they are just ether pollution. --ANK | |
343 | */ | |
344 | break; | |
345 | } | |
346 | break; | |
347 | case ICMP_TIME_EXCEEDED: | |
348 | if (code != ICMP_EXC_TTL) | |
349 | return 0; | |
350 | break; | |
351 | } | |
352 | ||
353 | err = -ENOENT; | |
354 | ||
355 | rcu_read_lock(); | |
356 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); | |
357 | if (t == NULL || t->parms.iph.daddr == 0) | |
358 | goto out; | |
359 | ||
360 | err = 0; | |
361 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
362 | goto out; | |
363 | ||
364 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) | |
365 | t->err_count++; | |
366 | else | |
367 | t->err_count = 1; | |
368 | t->err_time = jiffies; | |
369 | out: | |
370 | rcu_read_unlock(); | |
371 | return err; | |
372 | } | |
373 | ||
374 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, | |
375 | struct sk_buff *skb) | |
376 | { | |
377 | struct iphdr *inner_iph = ip_hdr(skb); | |
378 | ||
379 | if (INET_ECN_is_ce(outer_iph->tos)) | |
380 | IP_ECN_set_ce(inner_iph); | |
381 | } | |
382 | ||
383 | static int ipip_rcv(struct sk_buff *skb) | |
384 | { | |
385 | struct ip_tunnel *tunnel; | |
386 | const struct iphdr *iph = ip_hdr(skb); | |
387 | ||
388 | rcu_read_lock(); | |
389 | tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); | |
390 | if (tunnel != NULL) { | |
391 | struct pcpu_tstats *tstats; | |
392 | ||
393 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
394 | rcu_read_unlock(); | |
395 | kfree_skb(skb); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | secpath_reset(skb); | |
400 | ||
401 | skb->mac_header = skb->network_header; | |
402 | skb_reset_network_header(skb); | |
403 | skb->protocol = htons(ETH_P_IP); | |
404 | skb->pkt_type = PACKET_HOST; | |
405 | ||
406 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
407 | tstats->rx_packets++; | |
408 | tstats->rx_bytes += skb->len; | |
409 | ||
410 | __skb_tunnel_rx(skb, tunnel->dev); | |
411 | ||
412 | ipip_ecn_decapsulate(iph, skb); | |
413 | ||
414 | netif_rx(skb); | |
415 | ||
416 | rcu_read_unlock(); | |
417 | return 0; | |
418 | } | |
419 | rcu_read_unlock(); | |
420 | ||
421 | return -1; | |
422 | } | |
423 | ||
424 | /* | |
425 | * This function assumes it is being called from dev_queue_xmit() | |
426 | * and that skb is filled properly by that function. | |
427 | */ | |
428 | ||
429 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
430 | { | |
431 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
432 | struct pcpu_tstats *tstats; | |
433 | const struct iphdr *tiph = &tunnel->parms.iph; | |
434 | u8 tos = tunnel->parms.iph.tos; | |
435 | __be16 df = tiph->frag_off; | |
436 | struct rtable *rt; /* Route to the other host */ | |
437 | struct net_device *tdev; /* Device to other host */ | |
438 | const struct iphdr *old_iph = ip_hdr(skb); | |
439 | struct iphdr *iph; /* Our new IP header */ | |
440 | unsigned int max_headroom; /* The extra header space needed */ | |
441 | __be32 dst = tiph->daddr; | |
442 | struct flowi4 fl4; | |
443 | int mtu; | |
444 | ||
445 | if (skb->protocol != htons(ETH_P_IP)) | |
446 | goto tx_error; | |
447 | ||
448 | if (tos & 1) | |
449 | tos = old_iph->tos; | |
450 | ||
451 | if (!dst) { | |
452 | /* NBMA tunnel */ | |
453 | if ((rt = skb_rtable(skb)) == NULL) { | |
454 | dev->stats.tx_fifo_errors++; | |
455 | goto tx_error; | |
456 | } | |
457 | if ((dst = rt->rt_gateway) == 0) | |
458 | goto tx_error_icmp; | |
459 | } | |
460 | ||
461 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
462 | dst, tiph->saddr, | |
463 | 0, 0, | |
464 | IPPROTO_IPIP, RT_TOS(tos), | |
465 | tunnel->parms.link); | |
466 | if (IS_ERR(rt)) { | |
467 | dev->stats.tx_carrier_errors++; | |
468 | goto tx_error_icmp; | |
469 | } | |
470 | tdev = rt->dst.dev; | |
471 | ||
472 | if (tdev == dev) { | |
473 | ip_rt_put(rt); | |
474 | dev->stats.collisions++; | |
475 | goto tx_error; | |
476 | } | |
477 | ||
478 | df |= old_iph->frag_off & htons(IP_DF); | |
479 | ||
480 | if (df) { | |
481 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); | |
482 | ||
483 | if (mtu < 68) { | |
484 | dev->stats.collisions++; | |
485 | ip_rt_put(rt); | |
486 | goto tx_error; | |
487 | } | |
488 | ||
489 | if (skb_dst(skb)) | |
490 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
491 | ||
492 | if ((old_iph->frag_off & htons(IP_DF)) && | |
493 | mtu < ntohs(old_iph->tot_len)) { | |
494 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
495 | htonl(mtu)); | |
496 | ip_rt_put(rt); | |
497 | goto tx_error; | |
498 | } | |
499 | } | |
500 | ||
501 | if (tunnel->err_count > 0) { | |
502 | if (time_before(jiffies, | |
503 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
504 | tunnel->err_count--; | |
505 | dst_link_failure(skb); | |
506 | } else | |
507 | tunnel->err_count = 0; | |
508 | } | |
509 | ||
510 | /* | |
511 | * Okay, now see if we can stuff it in the buffer as-is. | |
512 | */ | |
513 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
514 | ||
515 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
516 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
517 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
518 | if (!new_skb) { | |
519 | ip_rt_put(rt); | |
520 | dev->stats.tx_dropped++; | |
521 | dev_kfree_skb(skb); | |
522 | return NETDEV_TX_OK; | |
523 | } | |
524 | if (skb->sk) | |
525 | skb_set_owner_w(new_skb, skb->sk); | |
526 | dev_kfree_skb(skb); | |
527 | skb = new_skb; | |
528 | old_iph = ip_hdr(skb); | |
529 | } | |
530 | ||
531 | skb->transport_header = skb->network_header; | |
532 | skb_push(skb, sizeof(struct iphdr)); | |
533 | skb_reset_network_header(skb); | |
534 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
535 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
536 | IPSKB_REROUTED); | |
537 | skb_dst_drop(skb); | |
538 | skb_dst_set(skb, &rt->dst); | |
539 | ||
540 | /* | |
541 | * Push down and install the IPIP header. | |
542 | */ | |
543 | ||
544 | iph = ip_hdr(skb); | |
545 | iph->version = 4; | |
546 | iph->ihl = sizeof(struct iphdr)>>2; | |
547 | iph->frag_off = df; | |
548 | iph->protocol = IPPROTO_IPIP; | |
549 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
550 | iph->daddr = fl4.daddr; | |
551 | iph->saddr = fl4.saddr; | |
552 | ||
553 | if ((iph->ttl = tiph->ttl) == 0) | |
554 | iph->ttl = old_iph->ttl; | |
555 | ||
556 | nf_reset(skb); | |
557 | tstats = this_cpu_ptr(dev->tstats); | |
558 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
559 | return NETDEV_TX_OK; | |
560 | ||
561 | tx_error_icmp: | |
562 | dst_link_failure(skb); | |
563 | tx_error: | |
564 | dev->stats.tx_errors++; | |
565 | dev_kfree_skb(skb); | |
566 | return NETDEV_TX_OK; | |
567 | } | |
568 | ||
569 | static void ipip_tunnel_bind_dev(struct net_device *dev) | |
570 | { | |
571 | struct net_device *tdev = NULL; | |
572 | struct ip_tunnel *tunnel; | |
573 | const struct iphdr *iph; | |
574 | ||
575 | tunnel = netdev_priv(dev); | |
576 | iph = &tunnel->parms.iph; | |
577 | ||
578 | if (iph->daddr) { | |
579 | struct rtable *rt; | |
580 | struct flowi4 fl4; | |
581 | ||
582 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
583 | iph->daddr, iph->saddr, | |
584 | 0, 0, | |
585 | IPPROTO_IPIP, | |
586 | RT_TOS(iph->tos), | |
587 | tunnel->parms.link); | |
588 | if (!IS_ERR(rt)) { | |
589 | tdev = rt->dst.dev; | |
590 | ip_rt_put(rt); | |
591 | } | |
592 | dev->flags |= IFF_POINTOPOINT; | |
593 | } | |
594 | ||
595 | if (!tdev && tunnel->parms.link) | |
596 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
597 | ||
598 | if (tdev) { | |
599 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
600 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
601 | } | |
602 | dev->iflink = tunnel->parms.link; | |
603 | } | |
604 | ||
605 | static int | |
606 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
607 | { | |
608 | int err = 0; | |
609 | struct ip_tunnel_parm p; | |
610 | struct ip_tunnel *t; | |
611 | struct net *net = dev_net(dev); | |
612 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
613 | ||
614 | switch (cmd) { | |
615 | case SIOCGETTUNNEL: | |
616 | t = NULL; | |
617 | if (dev == ipn->fb_tunnel_dev) { | |
618 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
619 | err = -EFAULT; | |
620 | break; | |
621 | } | |
622 | t = ipip_tunnel_locate(net, &p, 0); | |
623 | } | |
624 | if (t == NULL) | |
625 | t = netdev_priv(dev); | |
626 | memcpy(&p, &t->parms, sizeof(p)); | |
627 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
628 | err = -EFAULT; | |
629 | break; | |
630 | ||
631 | case SIOCADDTUNNEL: | |
632 | case SIOCCHGTUNNEL: | |
633 | err = -EPERM; | |
634 | if (!capable(CAP_NET_ADMIN)) | |
635 | goto done; | |
636 | ||
637 | err = -EFAULT; | |
638 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
639 | goto done; | |
640 | ||
641 | err = -EINVAL; | |
642 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || | |
643 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
644 | goto done; | |
645 | if (p.iph.ttl) | |
646 | p.iph.frag_off |= htons(IP_DF); | |
647 | ||
648 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
649 | ||
650 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
651 | if (t != NULL) { | |
652 | if (t->dev != dev) { | |
653 | err = -EEXIST; | |
654 | break; | |
655 | } | |
656 | } else { | |
657 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
658 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
659 | err = -EINVAL; | |
660 | break; | |
661 | } | |
662 | t = netdev_priv(dev); | |
663 | ipip_tunnel_unlink(ipn, t); | |
664 | synchronize_net(); | |
665 | t->parms.iph.saddr = p.iph.saddr; | |
666 | t->parms.iph.daddr = p.iph.daddr; | |
667 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
668 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
669 | ipip_tunnel_link(ipn, t); | |
670 | netdev_state_change(dev); | |
671 | } | |
672 | } | |
673 | ||
674 | if (t) { | |
675 | err = 0; | |
676 | if (cmd == SIOCCHGTUNNEL) { | |
677 | t->parms.iph.ttl = p.iph.ttl; | |
678 | t->parms.iph.tos = p.iph.tos; | |
679 | t->parms.iph.frag_off = p.iph.frag_off; | |
680 | if (t->parms.link != p.link) { | |
681 | t->parms.link = p.link; | |
682 | ipip_tunnel_bind_dev(dev); | |
683 | netdev_state_change(dev); | |
684 | } | |
685 | } | |
686 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
687 | err = -EFAULT; | |
688 | } else | |
689 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
690 | break; | |
691 | ||
692 | case SIOCDELTUNNEL: | |
693 | err = -EPERM; | |
694 | if (!capable(CAP_NET_ADMIN)) | |
695 | goto done; | |
696 | ||
697 | if (dev == ipn->fb_tunnel_dev) { | |
698 | err = -EFAULT; | |
699 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
700 | goto done; | |
701 | err = -ENOENT; | |
702 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) | |
703 | goto done; | |
704 | err = -EPERM; | |
705 | if (t->dev == ipn->fb_tunnel_dev) | |
706 | goto done; | |
707 | dev = t->dev; | |
708 | } | |
709 | unregister_netdevice(dev); | |
710 | err = 0; | |
711 | break; | |
712 | ||
713 | default: | |
714 | err = -EINVAL; | |
715 | } | |
716 | ||
717 | done: | |
718 | return err; | |
719 | } | |
720 | ||
721 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
722 | { | |
723 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
724 | return -EINVAL; | |
725 | dev->mtu = new_mtu; | |
726 | return 0; | |
727 | } | |
728 | ||
729 | static const struct net_device_ops ipip_netdev_ops = { | |
730 | .ndo_uninit = ipip_tunnel_uninit, | |
731 | .ndo_start_xmit = ipip_tunnel_xmit, | |
732 | .ndo_do_ioctl = ipip_tunnel_ioctl, | |
733 | .ndo_change_mtu = ipip_tunnel_change_mtu, | |
734 | .ndo_get_stats = ipip_get_stats, | |
735 | }; | |
736 | ||
737 | static void ipip_dev_free(struct net_device *dev) | |
738 | { | |
739 | free_percpu(dev->tstats); | |
740 | free_netdev(dev); | |
741 | } | |
742 | ||
743 | static void ipip_tunnel_setup(struct net_device *dev) | |
744 | { | |
745 | dev->netdev_ops = &ipip_netdev_ops; | |
746 | dev->destructor = ipip_dev_free; | |
747 | ||
748 | dev->type = ARPHRD_TUNNEL; | |
749 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
750 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); | |
751 | dev->flags = IFF_NOARP; | |
752 | dev->iflink = 0; | |
753 | dev->addr_len = 4; | |
754 | dev->features |= NETIF_F_NETNS_LOCAL; | |
755 | dev->features |= NETIF_F_LLTX; | |
756 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
757 | } | |
758 | ||
759 | static int ipip_tunnel_init(struct net_device *dev) | |
760 | { | |
761 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
762 | ||
763 | tunnel->dev = dev; | |
764 | ||
765 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
766 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
767 | ||
768 | ipip_tunnel_bind_dev(dev); | |
769 | ||
770 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
771 | if (!dev->tstats) | |
772 | return -ENOMEM; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | static int __net_init ipip_fb_tunnel_init(struct net_device *dev) | |
778 | { | |
779 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
780 | struct iphdr *iph = &tunnel->parms.iph; | |
781 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); | |
782 | ||
783 | tunnel->dev = dev; | |
784 | strcpy(tunnel->parms.name, dev->name); | |
785 | ||
786 | iph->version = 4; | |
787 | iph->protocol = IPPROTO_IPIP; | |
788 | iph->ihl = 5; | |
789 | ||
790 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
791 | if (!dev->tstats) | |
792 | return -ENOMEM; | |
793 | ||
794 | dev_hold(dev); | |
795 | RCU_INIT_POINTER(ipn->tunnels_wc[0], tunnel); | |
796 | return 0; | |
797 | } | |
798 | ||
799 | static struct xfrm_tunnel ipip_handler __read_mostly = { | |
800 | .handler = ipip_rcv, | |
801 | .err_handler = ipip_err, | |
802 | .priority = 1, | |
803 | }; | |
804 | ||
805 | static const char banner[] __initconst = | |
806 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; | |
807 | ||
808 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) | |
809 | { | |
810 | int prio; | |
811 | ||
812 | for (prio = 1; prio < 4; prio++) { | |
813 | int h; | |
814 | for (h = 0; h < HASH_SIZE; h++) { | |
815 | struct ip_tunnel *t; | |
816 | ||
817 | t = rtnl_dereference(ipn->tunnels[prio][h]); | |
818 | while (t != NULL) { | |
819 | unregister_netdevice_queue(t->dev, head); | |
820 | t = rtnl_dereference(t->next); | |
821 | } | |
822 | } | |
823 | } | |
824 | } | |
825 | ||
826 | static int __net_init ipip_init_net(struct net *net) | |
827 | { | |
828 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
829 | struct ip_tunnel *t; | |
830 | int err; | |
831 | ||
832 | ipn->tunnels[0] = ipn->tunnels_wc; | |
833 | ipn->tunnels[1] = ipn->tunnels_l; | |
834 | ipn->tunnels[2] = ipn->tunnels_r; | |
835 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
836 | ||
837 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), | |
838 | "tunl0", | |
839 | ipip_tunnel_setup); | |
840 | if (!ipn->fb_tunnel_dev) { | |
841 | err = -ENOMEM; | |
842 | goto err_alloc_dev; | |
843 | } | |
844 | dev_net_set(ipn->fb_tunnel_dev, net); | |
845 | ||
846 | err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); | |
847 | if (err) | |
848 | goto err_reg_dev; | |
849 | ||
850 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
851 | goto err_reg_dev; | |
852 | ||
853 | t = netdev_priv(ipn->fb_tunnel_dev); | |
854 | ||
855 | strcpy(t->parms.name, ipn->fb_tunnel_dev->name); | |
856 | return 0; | |
857 | ||
858 | err_reg_dev: | |
859 | ipip_dev_free(ipn->fb_tunnel_dev); | |
860 | err_alloc_dev: | |
861 | /* nothing */ | |
862 | return err; | |
863 | } | |
864 | ||
865 | static void __net_exit ipip_exit_net(struct net *net) | |
866 | { | |
867 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
868 | LIST_HEAD(list); | |
869 | ||
870 | rtnl_lock(); | |
871 | ipip_destroy_tunnels(ipn, &list); | |
872 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); | |
873 | unregister_netdevice_many(&list); | |
874 | rtnl_unlock(); | |
875 | } | |
876 | ||
877 | static struct pernet_operations ipip_net_ops = { | |
878 | .init = ipip_init_net, | |
879 | .exit = ipip_exit_net, | |
880 | .id = &ipip_net_id, | |
881 | .size = sizeof(struct ipip_net), | |
882 | }; | |
883 | ||
884 | static int __init ipip_init(void) | |
885 | { | |
886 | int err; | |
887 | ||
888 | printk(banner); | |
889 | ||
890 | err = register_pernet_device(&ipip_net_ops); | |
891 | if (err < 0) | |
892 | return err; | |
893 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
894 | if (err < 0) { | |
895 | unregister_pernet_device(&ipip_net_ops); | |
896 | printk(KERN_INFO "ipip init: can't register tunnel\n"); | |
897 | } | |
898 | return err; | |
899 | } | |
900 | ||
901 | static void __exit ipip_fini(void) | |
902 | { | |
903 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) | |
904 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); | |
905 | ||
906 | unregister_pernet_device(&ipip_net_ops); | |
907 | } | |
908 | ||
909 | module_init(ipip_init); | |
910 | module_exit(ipip_fini); | |
911 | MODULE_LICENSE("GPL"); | |
912 | MODULE_ALIAS_NETDEV("tunl0"); |