projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
net: skb->rtable accessor
[GitHub/mt8127/android_kernel_alcatel_ttab.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 <asm/uaccess.h>
99 #include <linux/skbuff.h>
100 #include <linux/netdevice.h>
101 #include <linux/in.h>
102 #include <linux/tcp.h>
103 #include <linux/udp.h>
104 #include <linux/if_arp.h>
105 #include <linux/mroute.h>
106 #include <linux/init.h>
107 #include <linux/netfilter_ipv4.h>
108 #include <linux/if_ether.h>
109
110 #include <net/sock.h>
111 #include <net/ip.h>
112 #include <net/icmp.h>
113 #include <net/ipip.h>
114 #include <net/inet_ecn.h>
115 #include <net/xfrm.h>
116 #include <net/net_namespace.h>
117 #include <net/netns/generic.h>
118
119 #define HASH_SIZE 16
120 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
121
122 static int ipip_net_id;
123 struct ipip_net {
124 struct ip_tunnel *tunnels_r_l[HASH_SIZE];
125 struct ip_tunnel *tunnels_r[HASH_SIZE];
126 struct ip_tunnel *tunnels_l[HASH_SIZE];
127 struct ip_tunnel *tunnels_wc[1];
128 struct ip_tunnel **tunnels[4];
129
130 struct net_device *fb_tunnel_dev;
131 };
132
133 static void ipip_fb_tunnel_init(struct net_device *dev);
134 static void ipip_tunnel_init(struct net_device *dev);
135 static void ipip_tunnel_setup(struct net_device *dev);
136
137 static DEFINE_RWLOCK(ipip_lock);
138
139 static struct ip_tunnel * ipip_tunnel_lookup(struct net *net,
140 __be32 remote, __be32 local)
141 {
142 unsigned h0 = HASH(remote);
143 unsigned h1 = HASH(local);
144 struct ip_tunnel *t;
145 struct ipip_net *ipn = net_generic(net, ipip_net_id);
146
147 for (t = ipn->tunnels_r_l[h0^h1]; t; t = t->next) {
148 if (local == t->parms.iph.saddr &&
149 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
150 return t;
151 }
152 for (t = ipn->tunnels_r[h0]; t; t = t->next) {
153 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
154 return t;
155 }
156 for (t = ipn->tunnels_l[h1]; t; t = t->next) {
157 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
158 return t;
159 }
160 if ((t = ipn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
161 return t;
162 return NULL;
163 }
164
165 static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn,
166 struct ip_tunnel_parm *parms)
167 {
168 __be32 remote = parms->iph.daddr;
169 __be32 local = parms->iph.saddr;
170 unsigned h = 0;
171 int prio = 0;
172
173 if (remote) {
174 prio |= 2;
175 h ^= HASH(remote);
176 }
177 if (local) {
178 prio |= 1;
179 h ^= HASH(local);
180 }
181 return &ipn->tunnels[prio][h];
182 }
183
184 static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn,
185 struct ip_tunnel *t)
186 {
187 return __ipip_bucket(ipn, &t->parms);
188 }
189
190 static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t)
191 {
192 struct ip_tunnel **tp;
193
194 for (tp = ipip_bucket(ipn, t); *tp; tp = &(*tp)->next) {
195 if (t == *tp) {
196 write_lock_bh(&ipip_lock);
197 *tp = t->next;
198 write_unlock_bh(&ipip_lock);
199 break;
200 }
201 }
202 }
203
204 static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t)
205 {
206 struct ip_tunnel **tp = ipip_bucket(ipn, t);
207
208 t->next = *tp;
209 write_lock_bh(&ipip_lock);
210 *tp = t;
211 write_unlock_bh(&ipip_lock);
212 }
213
214 static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
215 struct ip_tunnel_parm *parms, int create)
216 {
217 __be32 remote = parms->iph.daddr;
218 __be32 local = parms->iph.saddr;
219 struct ip_tunnel *t, **tp, *nt;
220 struct net_device *dev;
221 char name[IFNAMSIZ];
222 struct ipip_net *ipn = net_generic(net, ipip_net_id);
223
224 for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) {
225 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
226 return t;
227 }
228 if (!create)
229 return NULL;
230
231 if (parms->name[0])
232 strlcpy(name, parms->name, IFNAMSIZ);
233 else
234 sprintf(name, "tunl%%d");
235
236 dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
237 if (dev == NULL)
238 return NULL;
239
240 dev_net_set(dev, net);
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 nt->parms = *parms;
249
250 ipip_tunnel_init(dev);
251
252 if (register_netdevice(dev) < 0)
253 goto failed_free;
254
255 dev_hold(dev);
256 ipip_tunnel_link(ipn, nt);
257 return nt;
258
259 failed_free:
260 free_netdev(dev);
261 return NULL;
262 }
263
264 static void ipip_tunnel_uninit(struct net_device *dev)
265 {
266 struct net *net = dev_net(dev);
267 struct ipip_net *ipn = net_generic(net, ipip_net_id);
268
269 if (dev == ipn->fb_tunnel_dev) {
270 write_lock_bh(&ipip_lock);
271 ipn->tunnels_wc[0] = NULL;
272 write_unlock_bh(&ipip_lock);
273 } else
274 ipip_tunnel_unlink(ipn, netdev_priv(dev));
275 dev_put(dev);
276 }
277
278 static int ipip_err(struct sk_buff *skb, u32 info)
279 {
280
281 /* 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 (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
331 t->err_count++;
332 else
333 t->err_count = 1;
334 t->err_time = jiffies;
335 out:
336 read_unlock(&ipip_lock);
337 return err;
338 }
339
340 static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph,
341 struct sk_buff *skb)
342 {
343 struct iphdr *inner_iph = ip_hdr(skb);
344
345 if (INET_ECN_is_ce(outer_iph->tos))
346 IP_ECN_set_ce(inner_iph);
347 }
348
349 static int ipip_rcv(struct sk_buff *skb)
350 {
351 struct ip_tunnel *tunnel;
352 const struct iphdr *iph = ip_hdr(skb);
353
354 read_lock(&ipip_lock);
355 if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev),
356 iph->saddr, iph->daddr)) != NULL) {
357 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
358 read_unlock(&ipip_lock);
359 kfree_skb(skb);
360 return 0;
361 }
362
363 secpath_reset(skb);
364
365 skb->mac_header = skb->network_header;
366 skb_reset_network_header(skb);
367 skb->protocol = htons(ETH_P_IP);
368 skb->pkt_type = PACKET_HOST;
369
370 tunnel->dev->stats.rx_packets++;
371 tunnel->dev->stats.rx_bytes += skb->len;
372 skb->dev = tunnel->dev;
373 dst_release(skb->dst);
374 skb->dst = NULL;
375 nf_reset(skb);
376 ipip_ecn_decapsulate(iph, skb);
377 netif_rx(skb);
378 read_unlock(&ipip_lock);
379 return 0;
380 }
381 read_unlock(&ipip_lock);
382
383 return -1;
384 }
385
386 /*
387 * This function assumes it is being called from dev_queue_xmit()
388 * and that skb is filled properly by that function.
389 */
390
391 static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
392 {
393 struct ip_tunnel *tunnel = netdev_priv(dev);
394 struct net_device_stats *stats = &tunnel->dev->stats;
395 struct iphdr *tiph = &tunnel->parms.iph;
396 u8 tos = tunnel->parms.iph.tos;
397 __be16 df = tiph->frag_off;
398 struct rtable *rt; /* Route to the other host */
399 struct net_device *tdev; /* Device to other host */
400 struct iphdr *old_iph = ip_hdr(skb);
401 struct iphdr *iph; /* Our new IP header */
402 unsigned int max_headroom; /* The extra header space needed */
403 __be32 dst = tiph->daddr;
404 int mtu;
405
406 if (tunnel->recursion++) {
407 stats->collisions++;
408 goto tx_error;
409 }
410
411 if (skb->protocol != htons(ETH_P_IP))
412 goto tx_error;
413
414 if (tos&1)
415 tos = old_iph->tos;
416
417 if (!dst) {
418 /* NBMA tunnel */
419 if ((rt = skb_rtable(skb)) == NULL) {
420 stats->tx_fifo_errors++;
421 goto tx_error;
422 }
423 if ((dst = rt->rt_gateway) == 0)
424 goto tx_error_icmp;
425 }
426
427 {
428 struct flowi fl = { .oif = tunnel->parms.link,
429 .nl_u = { .ip4_u =
430 { .daddr = dst,
431 .saddr = tiph->saddr,
432 .tos = RT_TOS(tos) } },
433 .proto = IPPROTO_IPIP };
434 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
435 stats->tx_carrier_errors++;
436 goto tx_error_icmp;
437 }
438 }
439 tdev = rt->u.dst.dev;
440
441 if (tdev == dev) {
442 ip_rt_put(rt);
443 stats->collisions++;
444 goto tx_error;
445 }
446
447 if (tiph->frag_off)
448 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
449 else
450 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
451
452 if (mtu < 68) {
453 stats->collisions++;
454 ip_rt_put(rt);
455 goto tx_error;
456 }
457 if (skb->dst)
458 skb->dst->ops->update_pmtu(skb->dst, mtu);
459
460 df |= (old_iph->frag_off&htons(IP_DF));
461
462 if ((old_iph->frag_off&htons(IP_DF)) && mtu < ntohs(old_iph->tot_len)) {
463 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
464 ip_rt_put(rt);
465 goto tx_error;
466 }
467
468 if (tunnel->err_count > 0) {
469 if (time_before(jiffies,
470 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
471 tunnel->err_count--;
472 dst_link_failure(skb);
473 } else
474 tunnel->err_count = 0;
475 }
476
477 /*
478 * Okay, now see if we can stuff it in the buffer as-is.
479 */
480 max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr));
481
482 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
483 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
484 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
485 if (!new_skb) {
486 ip_rt_put(rt);
487 stats->tx_dropped++;
488 dev_kfree_skb(skb);
489 tunnel->recursion--;
490 return 0;
491 }
492 if (skb->sk)
493 skb_set_owner_w(new_skb, skb->sk);
494 dev_kfree_skb(skb);
495 skb = new_skb;
496 old_iph = ip_hdr(skb);
497 }
498
499 skb->transport_header = skb->network_header;
500 skb_push(skb, sizeof(struct iphdr));
501 skb_reset_network_header(skb);
502 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
503 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
504 IPSKB_REROUTED);
505 dst_release(skb->dst);
506 skb->dst = &rt->u.dst;
507
508 /*
509 * Push down and install the IPIP header.
510 */
511
512 iph = ip_hdr(skb);
513 iph->version = 4;
514 iph->ihl = sizeof(struct iphdr)>>2;
515 iph->frag_off = df;
516 iph->protocol = IPPROTO_IPIP;
517 iph->tos = INET_ECN_encapsulate(tos, old_iph->tos);
518 iph->daddr = rt->rt_dst;
519 iph->saddr = rt->rt_src;
520
521 if ((iph->ttl = tiph->ttl) == 0)
522 iph->ttl = old_iph->ttl;
523
524 nf_reset(skb);
525
526 IPTUNNEL_XMIT();
527 tunnel->recursion--;
528 return 0;
529
530 tx_error_icmp:
531 dst_link_failure(skb);
532 tx_error:
533 stats->tx_errors++;
534 dev_kfree_skb(skb);
535 tunnel->recursion--;
536 return 0;
537 }
538
539 static void ipip_tunnel_bind_dev(struct net_device *dev)
540 {
541 struct net_device *tdev = NULL;
542 struct ip_tunnel *tunnel;
543 struct iphdr *iph;
544
545 tunnel = netdev_priv(dev);
546 iph = &tunnel->parms.iph;
547
548 if (iph->daddr) {
549 struct flowi fl = { .oif = tunnel->parms.link,
550 .nl_u = { .ip4_u =
551 { .daddr = iph->daddr,
552 .saddr = iph->saddr,
553 .tos = RT_TOS(iph->tos) } },
554 .proto = IPPROTO_IPIP };
555 struct rtable *rt;
556 if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
557 tdev = rt->u.dst.dev;
558 ip_rt_put(rt);
559 }
560 dev->flags |= IFF_POINTOPOINT;
561 }
562
563 if (!tdev && tunnel->parms.link)
564 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
565
566 if (tdev) {
567 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
568 dev->mtu = tdev->mtu - sizeof(struct iphdr);
569 }
570 dev->iflink = tunnel->parms.link;
571 }
572
573 static int
574 ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
575 {
576 int err = 0;
577 struct ip_tunnel_parm p;
578 struct ip_tunnel *t;
579 struct net *net = dev_net(dev);
580 struct ipip_net *ipn = net_generic(net, ipip_net_id);
581
582 switch (cmd) {
583 case SIOCGETTUNNEL:
584 t = NULL;
585 if (dev == ipn->fb_tunnel_dev) {
586 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
587 err = -EFAULT;
588 break;
589 }
590 t = ipip_tunnel_locate(net, &p, 0);
591 }
592 if (t == NULL)
593 t = netdev_priv(dev);
594 memcpy(&p, &t->parms, sizeof(p));
595 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
596 err = -EFAULT;
597 break;
598
599 case SIOCADDTUNNEL:
600 case SIOCCHGTUNNEL:
601 err = -EPERM;
602 if (!capable(CAP_NET_ADMIN))
603 goto done;
604
605 err = -EFAULT;
606 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
607 goto done;
608
609 err = -EINVAL;
610 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
611 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
612 goto done;
613 if (p.iph.ttl)
614 p.iph.frag_off |= htons(IP_DF);
615
616 t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
617
618 if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
619 if (t != NULL) {
620 if (t->dev != dev) {
621 err = -EEXIST;
622 break;
623 }
624 } else {
625 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
626 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
627 err = -EINVAL;
628 break;
629 }
630 t = netdev_priv(dev);
631 ipip_tunnel_unlink(ipn, t);
632 t->parms.iph.saddr = p.iph.saddr;
633 t->parms.iph.daddr = p.iph.daddr;
634 memcpy(dev->dev_addr, &p.iph.saddr, 4);
635 memcpy(dev->broadcast, &p.iph.daddr, 4);
636 ipip_tunnel_link(ipn, t);
637 netdev_state_change(dev);
638 }
639 }
640
641 if (t) {
642 err = 0;
643 if (cmd == SIOCCHGTUNNEL) {
644 t->parms.iph.ttl = p.iph.ttl;
645 t->parms.iph.tos = p.iph.tos;
646 t->parms.iph.frag_off = p.iph.frag_off;
647 if (t->parms.link != p.link) {
648 t->parms.link = p.link;
649 ipip_tunnel_bind_dev(dev);
650 netdev_state_change(dev);
651 }
652 }
653 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
654 err = -EFAULT;
655 } else
656 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
657 break;
658
659 case SIOCDELTUNNEL:
660 err = -EPERM;
661 if (!capable(CAP_NET_ADMIN))
662 goto done;
663
664 if (dev == ipn->fb_tunnel_dev) {
665 err = -EFAULT;
666 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
667 goto done;
668 err = -ENOENT;
669 if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL)
670 goto done;
671 err = -EPERM;
672 if (t->dev == ipn->fb_tunnel_dev)
673 goto done;
674 dev = t->dev;
675 }
676 unregister_netdevice(dev);
677 err = 0;
678 break;
679
680 default:
681 err = -EINVAL;
682 }
683
684 done:
685 return err;
686 }
687
688 static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
689 {
690 if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr))
691 return -EINVAL;
692 dev->mtu = new_mtu;
693 return 0;
694 }
695
696 static const struct net_device_ops ipip_netdev_ops = {
697 .ndo_uninit = ipip_tunnel_uninit,
698 .ndo_start_xmit = ipip_tunnel_xmit,
699 .ndo_do_ioctl = ipip_tunnel_ioctl,
700 .ndo_change_mtu = ipip_tunnel_change_mtu,
701
702 };
703
704 static void ipip_tunnel_setup(struct net_device *dev)
705 {
706 dev->netdev_ops = &ipip_netdev_ops;
707 dev->destructor = free_netdev;
708
709 dev->type = ARPHRD_TUNNEL;
710 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
711 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
712 dev->flags = IFF_NOARP;
713 dev->iflink = 0;
714 dev->addr_len = 4;
715 dev->features |= NETIF_F_NETNS_LOCAL;
716 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
717 }
718
719 static void ipip_tunnel_init(struct net_device *dev)
720 {
721 struct ip_tunnel *tunnel = netdev_priv(dev);
722
723 tunnel->dev = dev;
724 strcpy(tunnel->parms.name, dev->name);
725
726 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
727 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
728
729 ipip_tunnel_bind_dev(dev);
730 }
731
732 static void ipip_fb_tunnel_init(struct net_device *dev)
733 {
734 struct ip_tunnel *tunnel = netdev_priv(dev);
735 struct iphdr *iph = &tunnel->parms.iph;
736 struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id);
737
738 tunnel->dev = dev;
739 strcpy(tunnel->parms.name, dev->name);
740
741 iph->version = 4;
742 iph->protocol = IPPROTO_IPIP;
743 iph->ihl = 5;
744
745 dev_hold(dev);
746 ipn->tunnels_wc[0] = tunnel;
747 }
748
749 static struct xfrm_tunnel ipip_handler = {
750 .handler = ipip_rcv,
751 .err_handler = ipip_err,
752 .priority = 1,
753 };
754
755 static const char banner[] __initconst =
756 KERN_INFO "IPv4 over IPv4 tunneling driver\n";
757
758 static void ipip_destroy_tunnels(struct ipip_net *ipn)
759 {
760 int prio;
761
762 for (prio = 1; prio < 4; prio++) {
763 int h;
764 for (h = 0; h < HASH_SIZE; h++) {
765 struct ip_tunnel *t;
766 while ((t = ipn->tunnels[prio][h]) != NULL)
767 unregister_netdevice(t->dev);
768 }
769 }
770 }
771
772 static int ipip_init_net(struct net *net)
773 {
774 int err;
775 struct ipip_net *ipn;
776
777 err = -ENOMEM;
778 ipn = kzalloc(sizeof(struct ipip_net), GFP_KERNEL);
779 if (ipn == NULL)
780 goto err_alloc;
781
782 err = net_assign_generic(net, ipip_net_id, ipn);
783 if (err < 0)
784 goto err_assign;
785
786 ipn->tunnels[0] = ipn->tunnels_wc;
787 ipn->tunnels[1] = ipn->tunnels_l;
788 ipn->tunnels[2] = ipn->tunnels_r;
789 ipn->tunnels[3] = ipn->tunnels_r_l;
790
791 ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
792 "tunl0",
793 ipip_tunnel_setup);
794 if (!ipn->fb_tunnel_dev) {
795 err = -ENOMEM;
796 goto err_alloc_dev;
797 }
798 dev_net_set(ipn->fb_tunnel_dev, net);
799
800 ipip_fb_tunnel_init(ipn->fb_tunnel_dev);
801
802 if ((err = register_netdev(ipn->fb_tunnel_dev)))
803 goto err_reg_dev;
804
805 return 0;
806
807 err_reg_dev:
808 free_netdev(ipn->fb_tunnel_dev);
809 err_alloc_dev:
810 /* nothing */
811 err_assign:
812 kfree(ipn);
813 err_alloc:
814 return err;
815 }
816
817 static void ipip_exit_net(struct net *net)
818 {
819 struct ipip_net *ipn;
820
821 ipn = net_generic(net, ipip_net_id);
822 rtnl_lock();
823 ipip_destroy_tunnels(ipn);
824 unregister_netdevice(ipn->fb_tunnel_dev);
825 rtnl_unlock();
826 kfree(ipn);
827 }
828
829 static struct pernet_operations ipip_net_ops = {
830 .init = ipip_init_net,
831 .exit = ipip_exit_net,
832 };
833
834 static int __init ipip_init(void)
835 {
836 int err;
837
838 printk(banner);
839
840 if (xfrm4_tunnel_register(&ipip_handler, AF_INET)) {
841 printk(KERN_INFO "ipip init: can't register tunnel\n");
842 return -EAGAIN;
843 }
844
845 err = register_pernet_gen_device(&ipip_net_id, &ipip_net_ops);
846 if (err)
847 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
848
849 return err;
850 }
851
852 static void __exit ipip_fini(void)
853 {
854 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
855 printk(KERN_INFO "ipip close: can't deregister tunnel\n");
856
857 unregister_pernet_gen_device(ipip_net_id, &ipip_net_ops);
858 }
859
860 module_init(ipip_init);
861 module_exit(ipip_fini);
862 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)