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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / ipv4 / ipip.c
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_assign_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_assign_pointer(t->next, rtnl_dereference(*tp));
245 rcu_assign_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 dst = rt->rt_gateway;
458 }
459
460 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
461 dst, tiph->saddr,
462 0, 0,
463 IPPROTO_IPIP, RT_TOS(tos),
464 tunnel->parms.link);
465 if (IS_ERR(rt)) {
466 dev->stats.tx_carrier_errors++;
467 goto tx_error_icmp;
468 }
469 tdev = rt->dst.dev;
470
471 if (tdev == dev) {
472 ip_rt_put(rt);
473 dev->stats.collisions++;
474 goto tx_error;
475 }
476
477 df |= old_iph->frag_off & htons(IP_DF);
478
479 if (df) {
480 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
481
482 if (mtu < 68) {
483 dev->stats.collisions++;
484 ip_rt_put(rt);
485 goto tx_error;
486 }
487
488 if (skb_dst(skb))
489 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
490
491 if ((old_iph->frag_off & htons(IP_DF)) &&
492 mtu < ntohs(old_iph->tot_len)) {
493 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
494 htonl(mtu));
495 ip_rt_put(rt);
496 goto tx_error;
497 }
498 }
499
500 if (tunnel->err_count > 0) {
501 if (time_before(jiffies,
502 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
503 tunnel->err_count--;
504 dst_link_failure(skb);
505 } else
506 tunnel->err_count = 0;
507 }
508
509 /*
510 * Okay, now see if we can stuff it in the buffer as-is.
511 */
512 max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr));
513
514 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
515 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
516 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
517 if (!new_skb) {
518 ip_rt_put(rt);
519 dev->stats.tx_dropped++;
520 dev_kfree_skb(skb);
521 return NETDEV_TX_OK;
522 }
523 if (skb->sk)
524 skb_set_owner_w(new_skb, skb->sk);
525 dev_kfree_skb(skb);
526 skb = new_skb;
527 old_iph = ip_hdr(skb);
528 }
529
530 skb->transport_header = skb->network_header;
531 skb_push(skb, sizeof(struct iphdr));
532 skb_reset_network_header(skb);
533 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
534 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
535 IPSKB_REROUTED);
536 skb_dst_drop(skb);
537 skb_dst_set(skb, &rt->dst);
538
539 /*
540 * Push down and install the IPIP header.
541 */
542
543 iph = ip_hdr(skb);
544 iph->version = 4;
545 iph->ihl = sizeof(struct iphdr)>>2;
546 iph->frag_off = df;
547 iph->protocol = IPPROTO_IPIP;
548 iph->tos = INET_ECN_encapsulate(tos, old_iph->tos);
549 iph->daddr = fl4.daddr;
550 iph->saddr = fl4.saddr;
551
552 if ((iph->ttl = tiph->ttl) == 0)
553 iph->ttl = old_iph->ttl;
554
555 nf_reset(skb);
556 tstats = this_cpu_ptr(dev->tstats);
557 __IPTUNNEL_XMIT(tstats, &dev->stats);
558 return NETDEV_TX_OK;
559
560 tx_error_icmp:
561 dst_link_failure(skb);
562 tx_error:
563 dev->stats.tx_errors++;
564 dev_kfree_skb(skb);
565 return NETDEV_TX_OK;
566 }
567
568 static void ipip_tunnel_bind_dev(struct net_device *dev)
569 {
570 struct net_device *tdev = NULL;
571 struct ip_tunnel *tunnel;
572 const struct iphdr *iph;
573
574 tunnel = netdev_priv(dev);
575 iph = &tunnel->parms.iph;
576
577 if (iph->daddr) {
578 struct rtable *rt;
579 struct flowi4 fl4;
580
581 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
582 iph->daddr, iph->saddr,
583 0, 0,
584 IPPROTO_IPIP,
585 RT_TOS(iph->tos),
586 tunnel->parms.link);
587 if (!IS_ERR(rt)) {
588 tdev = rt->dst.dev;
589 ip_rt_put(rt);
590 }
591 dev->flags |= IFF_POINTOPOINT;
592 }
593
594 if (!tdev && tunnel->parms.link)
595 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
596
597 if (tdev) {
598 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
599 dev->mtu = tdev->mtu - sizeof(struct iphdr);
600 }
601 dev->iflink = tunnel->parms.link;
602 }
603
604 static int
605 ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
606 {
607 int err = 0;
608 struct ip_tunnel_parm p;
609 struct ip_tunnel *t;
610 struct net *net = dev_net(dev);
611 struct ipip_net *ipn = net_generic(net, ipip_net_id);
612
613 switch (cmd) {
614 case SIOCGETTUNNEL:
615 t = NULL;
616 if (dev == ipn->fb_tunnel_dev) {
617 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
618 err = -EFAULT;
619 break;
620 }
621 t = ipip_tunnel_locate(net, &p, 0);
622 }
623 if (t == NULL)
624 t = netdev_priv(dev);
625 memcpy(&p, &t->parms, sizeof(p));
626 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
627 err = -EFAULT;
628 break;
629
630 case SIOCADDTUNNEL:
631 case SIOCCHGTUNNEL:
632 err = -EPERM;
633 if (!capable(CAP_NET_ADMIN))
634 goto done;
635
636 err = -EFAULT;
637 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
638 goto done;
639
640 err = -EINVAL;
641 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
642 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
643 goto done;
644 if (p.iph.ttl)
645 p.iph.frag_off |= htons(IP_DF);
646
647 t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
648
649 if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
650 if (t != NULL) {
651 if (t->dev != dev) {
652 err = -EEXIST;
653 break;
654 }
655 } else {
656 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
657 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
658 err = -EINVAL;
659 break;
660 }
661 t = netdev_priv(dev);
662 ipip_tunnel_unlink(ipn, t);
663 synchronize_net();
664 t->parms.iph.saddr = p.iph.saddr;
665 t->parms.iph.daddr = p.iph.daddr;
666 memcpy(dev->dev_addr, &p.iph.saddr, 4);
667 memcpy(dev->broadcast, &p.iph.daddr, 4);
668 ipip_tunnel_link(ipn, t);
669 netdev_state_change(dev);
670 }
671 }
672
673 if (t) {
674 err = 0;
675 if (cmd == SIOCCHGTUNNEL) {
676 t->parms.iph.ttl = p.iph.ttl;
677 t->parms.iph.tos = p.iph.tos;
678 t->parms.iph.frag_off = p.iph.frag_off;
679 if (t->parms.link != p.link) {
680 t->parms.link = p.link;
681 ipip_tunnel_bind_dev(dev);
682 netdev_state_change(dev);
683 }
684 }
685 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
686 err = -EFAULT;
687 } else
688 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
689 break;
690
691 case SIOCDELTUNNEL:
692 err = -EPERM;
693 if (!capable(CAP_NET_ADMIN))
694 goto done;
695
696 if (dev == ipn->fb_tunnel_dev) {
697 err = -EFAULT;
698 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
699 goto done;
700 err = -ENOENT;
701 if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL)
702 goto done;
703 err = -EPERM;
704 if (t->dev == ipn->fb_tunnel_dev)
705 goto done;
706 dev = t->dev;
707 }
708 unregister_netdevice(dev);
709 err = 0;
710 break;
711
712 default:
713 err = -EINVAL;
714 }
715
716 done:
717 return err;
718 }
719
720 static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
721 {
722 if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr))
723 return -EINVAL;
724 dev->mtu = new_mtu;
725 return 0;
726 }
727
728 static const struct net_device_ops ipip_netdev_ops = {
729 .ndo_uninit = ipip_tunnel_uninit,
730 .ndo_start_xmit = ipip_tunnel_xmit,
731 .ndo_do_ioctl = ipip_tunnel_ioctl,
732 .ndo_change_mtu = ipip_tunnel_change_mtu,
733 .ndo_get_stats = ipip_get_stats,
734 };
735
736 static void ipip_dev_free(struct net_device *dev)
737 {
738 free_percpu(dev->tstats);
739 free_netdev(dev);
740 }
741
742 static void ipip_tunnel_setup(struct net_device *dev)
743 {
744 dev->netdev_ops = &ipip_netdev_ops;
745 dev->destructor = ipip_dev_free;
746
747 dev->type = ARPHRD_TUNNEL;
748 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
749 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
750 dev->flags = IFF_NOARP;
751 dev->iflink = 0;
752 dev->addr_len = 4;
753 dev->features |= NETIF_F_NETNS_LOCAL;
754 dev->features |= NETIF_F_LLTX;
755 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
756 }
757
758 static int ipip_tunnel_init(struct net_device *dev)
759 {
760 struct ip_tunnel *tunnel = netdev_priv(dev);
761
762 tunnel->dev = dev;
763
764 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
765 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
766
767 ipip_tunnel_bind_dev(dev);
768
769 dev->tstats = alloc_percpu(struct pcpu_tstats);
770 if (!dev->tstats)
771 return -ENOMEM;
772
773 return 0;
774 }
775
776 static int __net_init ipip_fb_tunnel_init(struct net_device *dev)
777 {
778 struct ip_tunnel *tunnel = netdev_priv(dev);
779 struct iphdr *iph = &tunnel->parms.iph;
780 struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id);
781
782 tunnel->dev = dev;
783 strcpy(tunnel->parms.name, dev->name);
784
785 iph->version = 4;
786 iph->protocol = IPPROTO_IPIP;
787 iph->ihl = 5;
788
789 dev->tstats = alloc_percpu(struct pcpu_tstats);
790 if (!dev->tstats)
791 return -ENOMEM;
792
793 dev_hold(dev);
794 rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
795 return 0;
796 }
797
798 static struct xfrm_tunnel ipip_handler __read_mostly = {
799 .handler = ipip_rcv,
800 .err_handler = ipip_err,
801 .priority = 1,
802 };
803
804 static const char banner[] __initconst =
805 KERN_INFO "IPv4 over IPv4 tunneling driver\n";
806
807 static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head)
808 {
809 int prio;
810
811 for (prio = 1; prio < 4; prio++) {
812 int h;
813 for (h = 0; h < HASH_SIZE; h++) {
814 struct ip_tunnel *t;
815
816 t = rtnl_dereference(ipn->tunnels[prio][h]);
817 while (t != NULL) {
818 unregister_netdevice_queue(t->dev, head);
819 t = rtnl_dereference(t->next);
820 }
821 }
822 }
823 }
824
825 static int __net_init ipip_init_net(struct net *net)
826 {
827 struct ipip_net *ipn = net_generic(net, ipip_net_id);
828 struct ip_tunnel *t;
829 int err;
830
831 ipn->tunnels[0] = ipn->tunnels_wc;
832 ipn->tunnels[1] = ipn->tunnels_l;
833 ipn->tunnels[2] = ipn->tunnels_r;
834 ipn->tunnels[3] = ipn->tunnels_r_l;
835
836 ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
837 "tunl0",
838 ipip_tunnel_setup);
839 if (!ipn->fb_tunnel_dev) {
840 err = -ENOMEM;
841 goto err_alloc_dev;
842 }
843 dev_net_set(ipn->fb_tunnel_dev, net);
844
845 err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev);
846 if (err)
847 goto err_reg_dev;
848
849 if ((err = register_netdev(ipn->fb_tunnel_dev)))
850 goto err_reg_dev;
851
852 t = netdev_priv(ipn->fb_tunnel_dev);
853
854 strcpy(t->parms.name, ipn->fb_tunnel_dev->name);
855 return 0;
856
857 err_reg_dev:
858 ipip_dev_free(ipn->fb_tunnel_dev);
859 err_alloc_dev:
860 /* nothing */
861 return err;
862 }
863
864 static void __net_exit ipip_exit_net(struct net *net)
865 {
866 struct ipip_net *ipn = net_generic(net, ipip_net_id);
867 LIST_HEAD(list);
868
869 rtnl_lock();
870 ipip_destroy_tunnels(ipn, &list);
871 unregister_netdevice_queue(ipn->fb_tunnel_dev, &list);
872 unregister_netdevice_many(&list);
873 rtnl_unlock();
874 }
875
876 static struct pernet_operations ipip_net_ops = {
877 .init = ipip_init_net,
878 .exit = ipip_exit_net,
879 .id = &ipip_net_id,
880 .size = sizeof(struct ipip_net),
881 };
882
883 static int __init ipip_init(void)
884 {
885 int err;
886
887 printk(banner);
888
889 err = register_pernet_device(&ipip_net_ops);
890 if (err < 0)
891 return err;
892 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
893 if (err < 0) {
894 unregister_pernet_device(&ipip_net_ops);
895 pr_info("%s: can't register tunnel\n", __func__);
896 }
897 return err;
898 }
899
900 static void __exit ipip_fini(void)
901 {
902 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
903 pr_info("%s: can't deregister tunnel\n", __func__);
904
905 unregister_pernet_device(&ipip_net_ops);
906 }
907
908 module_init(ipip_init);
909 module_exit(ipip_fini);
910 MODULE_LICENSE("GPL");
911 MODULE_ALIAS_NETDEV("tunl0");
Linux kernel - Deliverables
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