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[IPIP]: Make tunnels hashes per net.
[net-next-2.6.git] / net / ipv4 / ipip.c
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1/*
2 * Linux NET3: IP/IP protocol decoder.
3 *
4 * Version: $Id: ipip.c,v 1.50 2001/10/02 02:22:36 davem Exp $
5 *
6 * Authors:
7 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
8 *
9 * Fixes:
10 * Alan Cox : Merged and made usable non modular (its so tiny its silly as
11 * a module taking up 2 pages).
12 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
13 * to keep ip_forward happy.
14 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
15 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
16 * David Woodhouse : Perform some basic ICMP handling.
17 * IPIP Routing without decapsulation.
18 * Carlos Picoto : GRE over IP support
19 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
20 * I do not want to merge them together.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 *
27 */
28
29/* tunnel.c: an IP tunnel driver
30
31 The purpose of this driver is to provide an IP tunnel through
32 which you can tunnel network traffic transparently across subnets.
33
34 This was written by looking at Nick Holloway's dummy driver
35 Thanks for the great code!
36
37 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
38
39 Minor tweaks:
40 Cleaned up the code a little and added some pre-1.3.0 tweaks.
41 dev->hard_header/hard_header_len changed to use no headers.
42 Comments/bracketing tweaked.
43 Made the tunnels use dev->name not tunnel: when error reporting.
44 Added tx_dropped stat
45
46 -Alan Cox (Alan.Cox@linux.org) 21 March 95
47
48 Reworked:
49 Changed to tunnel to destination gateway in addition to the
50 tunnel's pointopoint address
51 Almost completely rewritten
52 Note: There is currently no firewall or ICMP handling done.
53
54 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96
55
56*/
57
58/* Things I wish I had known when writing the tunnel driver:
59
60 When the tunnel_xmit() function is called, the skb contains the
61 packet to be sent (plus a great deal of extra info), and dev
62 contains the tunnel device that _we_ are.
63
64 When we are passed a packet, we are expected to fill in the
65 source address with our source IP address.
66
67 What is the proper way to allocate, copy and free a buffer?
68 After you allocate it, it is a "0 length" chunk of memory
69 starting at zero. If you want to add headers to the buffer
70 later, you'll have to call "skb_reserve(skb, amount)" with
71 the amount of memory you want reserved. Then, you call
72 "skb_put(skb, amount)" with the amount of space you want in
73 the buffer. skb_put() returns a pointer to the top (#0) of
74 that buffer. skb->len is set to the amount of space you have
75 "allocated" with skb_put(). You can then write up to skb->len
76 bytes to that buffer. If you need more, you can call skb_put()
77 again with the additional amount of space you need. You can
78 find out how much more space you can allocate by calling
79 "skb_tailroom(skb)".
80 Now, to add header space, call "skb_push(skb, header_len)".
81 This creates space at the beginning of the buffer and returns
82 a pointer to this new space. If later you need to strip a
83 header from a buffer, call "skb_pull(skb, header_len)".
84 skb_headroom() will return how much space is left at the top
85 of the buffer (before the main data). Remember, this headroom
86 space must be reserved before the skb_put() function is called.
87 */
88
89/*
90 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
91
92 For comments look at net/ipv4/ip_gre.c --ANK
93 */
94
95
96#include <linux/capability.h>
97#include <linux/module.h>
98#include <linux/types.h>
99#include <linux/kernel.h>
100#include <asm/uaccess.h>
101#include <linux/skbuff.h>
102#include <linux/netdevice.h>
103#include <linux/in.h>
104#include <linux/tcp.h>
105#include <linux/udp.h>
106#include <linux/if_arp.h>
107#include <linux/mroute.h>
108#include <linux/init.h>
109#include <linux/netfilter_ipv4.h>
110#include <linux/if_ether.h>
111
112#include <net/sock.h>
113#include <net/ip.h>
114#include <net/icmp.h>
115#include <net/ipip.h>
116#include <net/inet_ecn.h>
117#include <net/xfrm.h>
118#include <net/net_namespace.h>
119#include <net/netns/generic.h>
120
121#define HASH_SIZE 16
122#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
123
124static int ipip_net_id;
125struct ipip_net {
126 struct ip_tunnel *tunnels_r_l[HASH_SIZE];
127 struct ip_tunnel *tunnels_r[HASH_SIZE];
128 struct ip_tunnel *tunnels_l[HASH_SIZE];
129 struct ip_tunnel *tunnels_wc[1];
130 struct ip_tunnel **tunnels[4];
131
132 struct net_device *fb_tunnel_dev;
133};
134
135static int ipip_fb_tunnel_init(struct net_device *dev);
136static int ipip_tunnel_init(struct net_device *dev);
137static void ipip_tunnel_setup(struct net_device *dev);
138
139static DEFINE_RWLOCK(ipip_lock);
140
141static struct ip_tunnel * ipip_tunnel_lookup(struct net *net,
142 __be32 remote, __be32 local)
143{
144 unsigned h0 = HASH(remote);
145 unsigned h1 = HASH(local);
146 struct ip_tunnel *t;
147 struct ipip_net *ipn = net_generic(net, ipip_net_id);
148
149 for (t = ipn->tunnels_r_l[h0^h1]; t; t = t->next) {
150 if (local == t->parms.iph.saddr &&
151 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
152 return t;
153 }
154 for (t = ipn->tunnels_r[h0]; t; t = t->next) {
155 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
156 return t;
157 }
158 for (t = ipn->tunnels_l[h1]; t; t = t->next) {
159 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
160 return t;
161 }
162 if ((t = ipn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
163 return t;
164 return NULL;
165}
166
167static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn,
168 struct ip_tunnel_parm *parms)
169{
170 __be32 remote = parms->iph.daddr;
171 __be32 local = parms->iph.saddr;
172 unsigned h = 0;
173 int prio = 0;
174
175 if (remote) {
176 prio |= 2;
177 h ^= HASH(remote);
178 }
179 if (local) {
180 prio |= 1;
181 h ^= HASH(local);
182 }
183 return &ipn->tunnels[prio][h];
184}
185
186static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn,
187 struct ip_tunnel *t)
188{
189 return __ipip_bucket(ipn, &t->parms);
190}
191
192static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t)
193{
194 struct ip_tunnel **tp;
195
196 for (tp = ipip_bucket(ipn, t); *tp; tp = &(*tp)->next) {
197 if (t == *tp) {
198 write_lock_bh(&ipip_lock);
199 *tp = t->next;
200 write_unlock_bh(&ipip_lock);
201 break;
202 }
203 }
204}
205
206static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t)
207{
208 struct ip_tunnel **tp = ipip_bucket(ipn, t);
209
210 t->next = *tp;
211 write_lock_bh(&ipip_lock);
212 *tp = t;
213 write_unlock_bh(&ipip_lock);
214}
215
216static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
217 struct ip_tunnel_parm *parms, int create)
218{
219 __be32 remote = parms->iph.daddr;
220 __be32 local = parms->iph.saddr;
221 struct ip_tunnel *t, **tp, *nt;
222 struct net_device *dev;
223 char name[IFNAMSIZ];
224 struct ipip_net *ipn = net_generic(net, ipip_net_id);
225
226 for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) {
227 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
228 return t;
229 }
230 if (!create)
231 return NULL;
232
233 if (parms->name[0])
234 strlcpy(name, parms->name, IFNAMSIZ);
235 else
236 sprintf(name, "tunl%%d");
237
238 dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
239 if (dev == NULL)
240 return NULL;
241
242 if (strchr(name, '%')) {
243 if (dev_alloc_name(dev, name) < 0)
244 goto failed_free;
245 }
246
247 nt = netdev_priv(dev);
248 dev->init = ipip_tunnel_init;
249 nt->parms = *parms;
250
251 if (register_netdevice(dev) < 0)
252 goto failed_free;
253
254 dev_hold(dev);
255 ipip_tunnel_link(ipn, nt);
256 return nt;
257
258failed_free:
259 free_netdev(dev);
260 return NULL;
261}
262
263static void ipip_tunnel_uninit(struct net_device *dev)
264{
265 struct net *net = dev_net(dev);
266 struct ipip_net *ipn = net_generic(net, ipip_net_id);
267
268 if (dev == ipn->fb_tunnel_dev) {
269 write_lock_bh(&ipip_lock);
270 ipn->tunnels_wc[0] = NULL;
271 write_unlock_bh(&ipip_lock);
272 } else
273 ipip_tunnel_unlink(ipn, netdev_priv(dev));
274 dev_put(dev);
275}
276
277static int ipip_err(struct sk_buff *skb, u32 info)
278{
279#ifndef I_WISH_WORLD_WERE_PERFECT
280
281/* It is not :-( All the routers (except for Linux) return only
282 8 bytes of packet payload. It means, that precise relaying of
283 ICMP in the real Internet is absolutely infeasible.
284 */
285 struct iphdr *iph = (struct iphdr*)skb->data;
286 const int type = icmp_hdr(skb)->type;
287 const int code = icmp_hdr(skb)->code;
288 struct ip_tunnel *t;
289 int err;
290
291 switch (type) {
292 default:
293 case ICMP_PARAMETERPROB:
294 return 0;
295
296 case ICMP_DEST_UNREACH:
297 switch (code) {
298 case ICMP_SR_FAILED:
299 case ICMP_PORT_UNREACH:
300 /* Impossible event. */
301 return 0;
302 case ICMP_FRAG_NEEDED:
303 /* Soft state for pmtu is maintained by IP core. */
304 return 0;
305 default:
306 /* All others are translated to HOST_UNREACH.
307 rfc2003 contains "deep thoughts" about NET_UNREACH,
308 I believe they are just ether pollution. --ANK
309 */
310 break;
311 }
312 break;
313 case ICMP_TIME_EXCEEDED:
314 if (code != ICMP_EXC_TTL)
315 return 0;
316 break;
317 }
318
319 err = -ENOENT;
320
321 read_lock(&ipip_lock);
322 t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
323 if (t == NULL || t->parms.iph.daddr == 0)
324 goto out;
325
326 err = 0;
327 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
328 goto out;
329
330 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
331 t->err_count++;
332 else
333 t->err_count = 1;
334 t->err_time = jiffies;
335out:
336 read_unlock(&ipip_lock);
337 return err;
338#else
339 struct iphdr *iph = (struct iphdr*)dp;
340 int hlen = iph->ihl<<2;
341 struct iphdr *eiph;
342 const int type = icmp_hdr(skb)->type;
343 const int code = icmp_hdr(skb)->code;
344 int rel_type = 0;
345 int rel_code = 0;
346 __be32 rel_info = 0;
347 __u32 n = 0;
348 struct sk_buff *skb2;
349 struct flowi fl;
350 struct rtable *rt;
351
352 if (len < hlen + sizeof(struct iphdr))
353 return 0;
354 eiph = (struct iphdr*)(dp + hlen);
355
356 switch (type) {
357 default:
358 return 0;
359 case ICMP_PARAMETERPROB:
360 n = ntohl(icmp_hdr(skb)->un.gateway) >> 24;
361 if (n < hlen)
362 return 0;
363
364 /* So... This guy found something strange INSIDE encapsulated
365 packet. Well, he is fool, but what can we do ?
366 */
367 rel_type = ICMP_PARAMETERPROB;
368 rel_info = htonl((n - hlen) << 24);
369 break;
370
371 case ICMP_DEST_UNREACH:
372 switch (code) {
373 case ICMP_SR_FAILED:
374 case ICMP_PORT_UNREACH:
375 /* Impossible event. */
376 return 0;
377 case ICMP_FRAG_NEEDED:
378 /* And it is the only really necessary thing :-) */
379 n = ntohs(icmp_hdr(skb)->un.frag.mtu);
380 if (n < hlen+68)
381 return 0;
382 n -= hlen;
383 /* BSD 4.2 MORE DOES NOT EXIST IN NATURE. */
384 if (n > ntohs(eiph->tot_len))
385 return 0;
386 rel_info = htonl(n);
387 break;
388 default:
389 /* All others are translated to HOST_UNREACH.
390 rfc2003 contains "deep thoughts" about NET_UNREACH,
391 I believe, it is just ether pollution. --ANK
392 */
393 rel_type = ICMP_DEST_UNREACH;
394 rel_code = ICMP_HOST_UNREACH;
395 break;
396 }
397 break;
398 case ICMP_TIME_EXCEEDED:
399 if (code != ICMP_EXC_TTL)
400 return 0;
401 break;
402 }
403
404 /* Prepare fake skb to feed it to icmp_send */
405 skb2 = skb_clone(skb, GFP_ATOMIC);
406 if (skb2 == NULL)
407 return 0;
408 dst_release(skb2->dst);
409 skb2->dst = NULL;
410 skb_pull(skb2, skb->data - (u8*)eiph);
411 skb_reset_network_header(skb2);
412
413 /* Try to guess incoming interface */
414 memset(&fl, 0, sizeof(fl));
415 fl.fl4_daddr = eiph->saddr;
416 fl.fl4_tos = RT_TOS(eiph->tos);
417 fl.proto = IPPROTO_IPIP;
418 if (ip_route_output_key(&init_net, &rt, &key)) {
419 kfree_skb(skb2);
420 return 0;
421 }
422 skb2->dev = rt->u.dst.dev;
423
424 /* route "incoming" packet */
425 if (rt->rt_flags&RTCF_LOCAL) {
426 ip_rt_put(rt);
427 rt = NULL;
428 fl.fl4_daddr = eiph->daddr;
429 fl.fl4_src = eiph->saddr;
430 fl.fl4_tos = eiph->tos;
431 if (ip_route_output_key(&init_net, &rt, &fl) ||
432 rt->u.dst.dev->type != ARPHRD_TUNNEL) {
433 ip_rt_put(rt);
434 kfree_skb(skb2);
435 return 0;
436 }
437 } else {
438 ip_rt_put(rt);
439 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, skb2->dev) ||
440 skb2->dst->dev->type != ARPHRD_TUNNEL) {
441 kfree_skb(skb2);
442 return 0;
443 }
444 }
445
446 /* change mtu on this route */
447 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
448 if (n > dst_mtu(skb2->dst)) {
449 kfree_skb(skb2);
450 return 0;
451 }
452 skb2->dst->ops->update_pmtu(skb2->dst, n);
453 } else if (type == ICMP_TIME_EXCEEDED) {
454 struct ip_tunnel *t = netdev_priv(skb2->dev);
455 if (t->parms.iph.ttl) {
456 rel_type = ICMP_DEST_UNREACH;
457 rel_code = ICMP_HOST_UNREACH;
458 }
459 }
460
461 icmp_send(skb2, rel_type, rel_code, rel_info);
462 kfree_skb(skb2);
463 return 0;
464#endif
465}
466
467static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph,
468 struct sk_buff *skb)
469{
470 struct iphdr *inner_iph = ip_hdr(skb);
471
472 if (INET_ECN_is_ce(outer_iph->tos))
473 IP_ECN_set_ce(inner_iph);
474}
475
476static int ipip_rcv(struct sk_buff *skb)
477{
478 struct ip_tunnel *tunnel;
479 const struct iphdr *iph = ip_hdr(skb);
480
481 read_lock(&ipip_lock);
482 if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev),
483 iph->saddr, iph->daddr)) != NULL) {
484 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
485 read_unlock(&ipip_lock);
486 kfree_skb(skb);
487 return 0;
488 }
489
490 secpath_reset(skb);
491
492 skb->mac_header = skb->network_header;
493 skb_reset_network_header(skb);
494 skb->protocol = htons(ETH_P_IP);
495 skb->pkt_type = PACKET_HOST;
496
497 tunnel->stat.rx_packets++;
498 tunnel->stat.rx_bytes += skb->len;
499 skb->dev = tunnel->dev;
500 dst_release(skb->dst);
501 skb->dst = NULL;
502 nf_reset(skb);
503 ipip_ecn_decapsulate(iph, skb);
504 netif_rx(skb);
505 read_unlock(&ipip_lock);
506 return 0;
507 }
508 read_unlock(&ipip_lock);
509
510 return -1;
511}
512
513/*
514 * This function assumes it is being called from dev_queue_xmit()
515 * and that skb is filled properly by that function.
516 */
517
518static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
519{
520 struct ip_tunnel *tunnel = netdev_priv(dev);
521 struct net_device_stats *stats = &tunnel->stat;
522 struct iphdr *tiph = &tunnel->parms.iph;
523 u8 tos = tunnel->parms.iph.tos;
524 __be16 df = tiph->frag_off;
525 struct rtable *rt; /* Route to the other host */
526 struct net_device *tdev; /* Device to other host */
527 struct iphdr *old_iph = ip_hdr(skb);
528 struct iphdr *iph; /* Our new IP header */
529 unsigned int max_headroom; /* The extra header space needed */
530 __be32 dst = tiph->daddr;
531 int mtu;
532
533 if (tunnel->recursion++) {
534 tunnel->stat.collisions++;
535 goto tx_error;
536 }
537
538 if (skb->protocol != htons(ETH_P_IP))
539 goto tx_error;
540
541 if (tos&1)
542 tos = old_iph->tos;
543
544 if (!dst) {
545 /* NBMA tunnel */
546 if ((rt = skb->rtable) == NULL) {
547 tunnel->stat.tx_fifo_errors++;
548 goto tx_error;
549 }
550 if ((dst = rt->rt_gateway) == 0)
551 goto tx_error_icmp;
552 }
553
554 {
555 struct flowi fl = { .oif = tunnel->parms.link,
556 .nl_u = { .ip4_u =
557 { .daddr = dst,
558 .saddr = tiph->saddr,
559 .tos = RT_TOS(tos) } },
560 .proto = IPPROTO_IPIP };
561 if (ip_route_output_key(&init_net, &rt, &fl)) {
562 tunnel->stat.tx_carrier_errors++;
563 goto tx_error_icmp;
564 }
565 }
566 tdev = rt->u.dst.dev;
567
568 if (tdev == dev) {
569 ip_rt_put(rt);
570 tunnel->stat.collisions++;
571 goto tx_error;
572 }
573
574 if (tiph->frag_off)
575 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
576 else
577 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
578
579 if (mtu < 68) {
580 tunnel->stat.collisions++;
581 ip_rt_put(rt);
582 goto tx_error;
583 }
584 if (skb->dst)
585 skb->dst->ops->update_pmtu(skb->dst, mtu);
586
587 df |= (old_iph->frag_off&htons(IP_DF));
588
589 if ((old_iph->frag_off&htons(IP_DF)) && mtu < ntohs(old_iph->tot_len)) {
590 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
591 ip_rt_put(rt);
592 goto tx_error;
593 }
594
595 if (tunnel->err_count > 0) {
596 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
597 tunnel->err_count--;
598 dst_link_failure(skb);
599 } else
600 tunnel->err_count = 0;
601 }
602
603 /*
604 * Okay, now see if we can stuff it in the buffer as-is.
605 */
606 max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr));
607
608 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
609 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
610 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
611 if (!new_skb) {
612 ip_rt_put(rt);
613 stats->tx_dropped++;
614 dev_kfree_skb(skb);
615 tunnel->recursion--;
616 return 0;
617 }
618 if (skb->sk)
619 skb_set_owner_w(new_skb, skb->sk);
620 dev_kfree_skb(skb);
621 skb = new_skb;
622 old_iph = ip_hdr(skb);
623 }
624
625 skb->transport_header = skb->network_header;
626 skb_push(skb, sizeof(struct iphdr));
627 skb_reset_network_header(skb);
628 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
629 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
630 IPSKB_REROUTED);
631 dst_release(skb->dst);
632 skb->dst = &rt->u.dst;
633
634 /*
635 * Push down and install the IPIP header.
636 */
637
638 iph = ip_hdr(skb);
639 iph->version = 4;
640 iph->ihl = sizeof(struct iphdr)>>2;
641 iph->frag_off = df;
642 iph->protocol = IPPROTO_IPIP;
643 iph->tos = INET_ECN_encapsulate(tos, old_iph->tos);
644 iph->daddr = rt->rt_dst;
645 iph->saddr = rt->rt_src;
646
647 if ((iph->ttl = tiph->ttl) == 0)
648 iph->ttl = old_iph->ttl;
649
650 nf_reset(skb);
651
652 IPTUNNEL_XMIT();
653 tunnel->recursion--;
654 return 0;
655
656tx_error_icmp:
657 dst_link_failure(skb);
658tx_error:
659 stats->tx_errors++;
660 dev_kfree_skb(skb);
661 tunnel->recursion--;
662 return 0;
663}
664
665static void ipip_tunnel_bind_dev(struct net_device *dev)
666{
667 struct net_device *tdev = NULL;
668 struct ip_tunnel *tunnel;
669 struct iphdr *iph;
670
671 tunnel = netdev_priv(dev);
672 iph = &tunnel->parms.iph;
673
674 if (iph->daddr) {
675 struct flowi fl = { .oif = tunnel->parms.link,
676 .nl_u = { .ip4_u =
677 { .daddr = iph->daddr,
678 .saddr = iph->saddr,
679 .tos = RT_TOS(iph->tos) } },
680 .proto = IPPROTO_IPIP };
681 struct rtable *rt;
682 if (!ip_route_output_key(&init_net, &rt, &fl)) {
683 tdev = rt->u.dst.dev;
684 ip_rt_put(rt);
685 }
686 dev->flags |= IFF_POINTOPOINT;
687 }
688
689 if (!tdev && tunnel->parms.link)
690 tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
691
692 if (tdev) {
693 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
694 dev->mtu = tdev->mtu - sizeof(struct iphdr);
695 }
696 dev->iflink = tunnel->parms.link;
697}
698
699static int
700ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
701{
702 int err = 0;
703 struct ip_tunnel_parm p;
704 struct ip_tunnel *t;
705 struct net *net = dev_net(dev);
706 struct ipip_net *ipn = net_generic(net, ipip_net_id);
707
708 switch (cmd) {
709 case SIOCGETTUNNEL:
710 t = NULL;
711 if (dev == ipn->fb_tunnel_dev) {
712 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
713 err = -EFAULT;
714 break;
715 }
716 t = ipip_tunnel_locate(net, &p, 0);
717 }
718 if (t == NULL)
719 t = netdev_priv(dev);
720 memcpy(&p, &t->parms, sizeof(p));
721 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
722 err = -EFAULT;
723 break;
724
725 case SIOCADDTUNNEL:
726 case SIOCCHGTUNNEL:
727 err = -EPERM;
728 if (!capable(CAP_NET_ADMIN))
729 goto done;
730
731 err = -EFAULT;
732 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
733 goto done;
734
735 err = -EINVAL;
736 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
737 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
738 goto done;
739 if (p.iph.ttl)
740 p.iph.frag_off |= htons(IP_DF);
741
742 t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
743
744 if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
745 if (t != NULL) {
746 if (t->dev != dev) {
747 err = -EEXIST;
748 break;
749 }
750 } else {
751 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
752 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
753 err = -EINVAL;
754 break;
755 }
756 t = netdev_priv(dev);
757 ipip_tunnel_unlink(ipn, t);
758 t->parms.iph.saddr = p.iph.saddr;
759 t->parms.iph.daddr = p.iph.daddr;
760 memcpy(dev->dev_addr, &p.iph.saddr, 4);
761 memcpy(dev->broadcast, &p.iph.daddr, 4);
762 ipip_tunnel_link(ipn, t);
763 netdev_state_change(dev);
764 }
765 }
766
767 if (t) {
768 err = 0;
769 if (cmd == SIOCCHGTUNNEL) {
770 t->parms.iph.ttl = p.iph.ttl;
771 t->parms.iph.tos = p.iph.tos;
772 t->parms.iph.frag_off = p.iph.frag_off;
773 if (t->parms.link != p.link) {
774 t->parms.link = p.link;
775 ipip_tunnel_bind_dev(dev);
776 netdev_state_change(dev);
777 }
778 }
779 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
780 err = -EFAULT;
781 } else
782 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
783 break;
784
785 case SIOCDELTUNNEL:
786 err = -EPERM;
787 if (!capable(CAP_NET_ADMIN))
788 goto done;
789
790 if (dev == ipn->fb_tunnel_dev) {
791 err = -EFAULT;
792 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
793 goto done;
794 err = -ENOENT;
795 if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL)
796 goto done;
797 err = -EPERM;
798 if (t->dev == ipn->fb_tunnel_dev)
799 goto done;
800 dev = t->dev;
801 }
802 unregister_netdevice(dev);
803 err = 0;
804 break;
805
806 default:
807 err = -EINVAL;
808 }
809
810done:
811 return err;
812}
813
814static struct net_device_stats *ipip_tunnel_get_stats(struct net_device *dev)
815{
816 return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
817}
818
819static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
820{
821 if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr))
822 return -EINVAL;
823 dev->mtu = new_mtu;
824 return 0;
825}
826
827static void ipip_tunnel_setup(struct net_device *dev)
828{
829 dev->uninit = ipip_tunnel_uninit;
830 dev->hard_start_xmit = ipip_tunnel_xmit;
831 dev->get_stats = ipip_tunnel_get_stats;
832 dev->do_ioctl = ipip_tunnel_ioctl;
833 dev->change_mtu = ipip_tunnel_change_mtu;
834 dev->destructor = free_netdev;
835
836 dev->type = ARPHRD_TUNNEL;
837 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
838 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
839 dev->flags = IFF_NOARP;
840 dev->iflink = 0;
841 dev->addr_len = 4;
842}
843
844static int ipip_tunnel_init(struct net_device *dev)
845{
846 struct ip_tunnel *tunnel;
847
848 tunnel = netdev_priv(dev);
849
850 tunnel->dev = dev;
851 strcpy(tunnel->parms.name, dev->name);
852
853 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
854 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
855
856 ipip_tunnel_bind_dev(dev);
857
858 return 0;
859}
860
861static int ipip_fb_tunnel_init(struct net_device *dev)
862{
863 struct ip_tunnel *tunnel = netdev_priv(dev);
864 struct iphdr *iph = &tunnel->parms.iph;
865 struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id);
866
867 tunnel->dev = dev;
868 strcpy(tunnel->parms.name, dev->name);
869
870 iph->version = 4;
871 iph->protocol = IPPROTO_IPIP;
872 iph->ihl = 5;
873
874 dev_hold(dev);
875 ipn->tunnels_wc[0] = tunnel;
876 return 0;
877}
878
879static struct xfrm_tunnel ipip_handler = {
880 .handler = ipip_rcv,
881 .err_handler = ipip_err,
882 .priority = 1,
883};
884
885static char banner[] __initdata =
886 KERN_INFO "IPv4 over IPv4 tunneling driver\n";
887
888static void ipip_destroy_tunnels(struct ipip_net *ipn)
889{
890 int prio;
891
892 for (prio = 1; prio < 4; prio++) {
893 int h;
894 for (h = 0; h < HASH_SIZE; h++) {
895 struct ip_tunnel *t;
896 while ((t = ipn->tunnels[prio][h]) != NULL)
897 unregister_netdevice(t->dev);
898 }
899 }
900}
901
902static int ipip_init_net(struct net *net)
903{
904 int err;
905 struct ipip_net *ipn;
906
907 err = -ENOMEM;
908 ipn = kzalloc(sizeof(struct ipip_net), GFP_KERNEL);
909 if (ipn == NULL)
910 goto err_alloc;
911
912 err = net_assign_generic(net, ipip_net_id, ipn);
913 if (err < 0)
914 goto err_assign;
915
916 ipn->tunnels[0] = ipn->tunnels_wc;
917 ipn->tunnels[1] = ipn->tunnels_l;
918 ipn->tunnels[2] = ipn->tunnels_r;
919 ipn->tunnels[3] = ipn->tunnels_r_l;
920
921 ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
922 "tunl0",
923 ipip_tunnel_setup);
924 if (!ipn->fb_tunnel_dev) {
925 err = -ENOMEM;
926 goto err_alloc_dev;
927 }
928
929 ipn->fb_tunnel_dev->init = ipip_fb_tunnel_init;
930 dev_net_set(ipn->fb_tunnel_dev, net);
931
932 if ((err = register_netdev(ipn->fb_tunnel_dev)))
933 goto err_reg_dev;
934
935 return 0;
936
937err_reg_dev:
938 free_netdev(ipn->fb_tunnel_dev);
939err_alloc_dev:
940 /* nothing */
941err_assign:
942 kfree(ipn);
943err_alloc:
944 return err;
945}
946
947static void ipip_exit_net(struct net *net)
948{
949 struct ipip_net *ipn;
950
951 ipn = net_generic(net, ipip_net_id);
952 rtnl_lock();
953 ipip_destroy_tunnels(ipn);
954 unregister_netdevice(ipn->fb_tunnel_dev);
955 rtnl_unlock();
956 kfree(ipn);
957}
958
959static struct pernet_operations ipip_net_ops = {
960 .init = ipip_init_net,
961 .exit = ipip_exit_net,
962};
963
964static int __init ipip_init(void)
965{
966 int err;
967
968 printk(banner);
969
970 if (xfrm4_tunnel_register(&ipip_handler, AF_INET)) {
971 printk(KERN_INFO "ipip init: can't register tunnel\n");
972 return -EAGAIN;
973 }
974
975 err = register_pernet_gen_device(&ipip_net_id, &ipip_net_ops);
976 if (err)
977 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
978
979 return err;
980}
981
982static void __exit ipip_fini(void)
983{
984 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
985 printk(KERN_INFO "ipip close: can't deregister tunnel\n");
986
987 unregister_pernet_gen_device(ipip_net_id, &ipip_net_ops);
988}
989
990module_init(ipip_init);
991module_exit(ipip_fini);
992MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree