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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6.git] / net / ipv4 / ip_vti.c
blobc118f6b576bbb50c6fa909bffa1f40930a7c2750
1 /*
2 * Linux NET3: IP/IP protocol decoder modified to support
3 * virtual tunnel interface
4 *
5 * Authors:
6 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 */
14
15 /*
16 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
17
18 For comments look at net/ipv4/ip_gre.c --ANK
19 */
20
21
22 #include <linux/capability.h>
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/kernel.h>
26 #include <linux/uaccess.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
29 #include <linux/in.h>
30 #include <linux/tcp.h>
31 #include <linux/udp.h>
32 #include <linux/if_arp.h>
33 #include <linux/mroute.h>
34 #include <linux/init.h>
35 #include <linux/netfilter_ipv4.h>
36 #include <linux/if_ether.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/icmp.h>
41 #include <net/ip_tunnels.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46
47 #define HASH_SIZE 16
48 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&(HASH_SIZE-1))
49
50 static struct rtnl_link_ops vti_link_ops __read_mostly;
51
52 static int vti_net_id __read_mostly;
53 struct vti_net {
54 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
55 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
56 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
57 struct ip_tunnel __rcu *tunnels_wc[1];
58 struct ip_tunnel __rcu **tunnels[4];
59
60 struct net_device *fb_tunnel_dev;
61 };
62
63 static int vti_fb_tunnel_init(struct net_device *dev);
64 static int vti_tunnel_init(struct net_device *dev);
65 static void vti_tunnel_setup(struct net_device *dev);
66 static void vti_dev_free(struct net_device *dev);
67 static int vti_tunnel_bind_dev(struct net_device *dev);
68
69 #define VTI_XMIT(stats1, stats2) do { \
70 int err; \
71 int pkt_len = skb->len; \
72 err = dst_output(skb); \
73 if (net_xmit_eval(err) == 0) { \
74 u64_stats_update_begin(&(stats1)->syncp); \
75 (stats1)->tx_bytes += pkt_len; \
76 (stats1)->tx_packets++; \
77 u64_stats_update_end(&(stats1)->syncp); \
78 } else { \
79 (stats2)->tx_errors++; \
80 (stats2)->tx_aborted_errors++; \
81 } \
82 } while (0)
83
84
85 static struct ip_tunnel *vti_tunnel_lookup(struct net *net,
86 __be32 remote, __be32 local)
87 {
88 unsigned h0 = HASH(remote);
89 unsigned h1 = HASH(local);
90 struct ip_tunnel *t;
91 struct vti_net *ipn = net_generic(net, vti_net_id);
92
93 for_each_ip_tunnel_rcu(t, ipn->tunnels_r_l[h0 ^ h1])
94 if (local == t->parms.iph.saddr &&
95 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
96 return t;
97 for_each_ip_tunnel_rcu(t, ipn->tunnels_r[h0])
98 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
99 return t;
100
101 for_each_ip_tunnel_rcu(t, ipn->tunnels_l[h1])
102 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
103 return t;
104
105 for_each_ip_tunnel_rcu(t, ipn->tunnels_wc[0])
106 if (t && (t->dev->flags&IFF_UP))
107 return t;
108 return NULL;
109 }
110
111 static struct ip_tunnel __rcu **__vti_bucket(struct vti_net *ipn,
112 struct ip_tunnel_parm *parms)
113 {
114 __be32 remote = parms->iph.daddr;
115 __be32 local = parms->iph.saddr;
116 unsigned h = 0;
117 int prio = 0;
118
119 if (remote) {
120 prio |= 2;
121 h ^= HASH(remote);
122 }
123 if (local) {
124 prio |= 1;
125 h ^= HASH(local);
126 }
127 return &ipn->tunnels[prio][h];
128 }
129
130 static inline struct ip_tunnel __rcu **vti_bucket(struct vti_net *ipn,
131 struct ip_tunnel *t)
132 {
133 return __vti_bucket(ipn, &t->parms);
134 }
135
136 static void vti_tunnel_unlink(struct vti_net *ipn, struct ip_tunnel *t)
137 {
138 struct ip_tunnel __rcu **tp;
139 struct ip_tunnel *iter;
140
141 for (tp = vti_bucket(ipn, t);
142 (iter = rtnl_dereference(*tp)) != NULL;
143 tp = &iter->next) {
144 if (t == iter) {
145 rcu_assign_pointer(*tp, t->next);
146 break;
147 }
148 }
149 }
150
151 static void vti_tunnel_link(struct vti_net *ipn, struct ip_tunnel *t)
152 {
153 struct ip_tunnel __rcu **tp = vti_bucket(ipn, t);
154
155 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
156 rcu_assign_pointer(*tp, t);
157 }
158
159 static struct ip_tunnel *vti_tunnel_locate(struct net *net,
160 struct ip_tunnel_parm *parms,
161 int create)
162 {
163 __be32 remote = parms->iph.daddr;
164 __be32 local = parms->iph.saddr;
165 struct ip_tunnel *t, *nt;
166 struct ip_tunnel __rcu **tp;
167 struct net_device *dev;
168 char name[IFNAMSIZ];
169 struct vti_net *ipn = net_generic(net, vti_net_id);
170
171 for (tp = __vti_bucket(ipn, parms);
172 (t = rtnl_dereference(*tp)) != NULL;
173 tp = &t->next) {
174 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
175 return t;
176 }
177 if (!create)
178 return NULL;
179
180 if (parms->name[0])
181 strlcpy(name, parms->name, IFNAMSIZ);
182 else
183 strcpy(name, "vti%d");
184
185 dev = alloc_netdev(sizeof(*t), name, vti_tunnel_setup);
186 if (dev == NULL)
187 return NULL;
188
189 dev_net_set(dev, net);
190
191 nt = netdev_priv(dev);
192 nt->parms = *parms;
193 dev->rtnl_link_ops = &vti_link_ops;
194
195 vti_tunnel_bind_dev(dev);
196
197 if (register_netdevice(dev) < 0)
198 goto failed_free;
199
200 dev_hold(dev);
201 vti_tunnel_link(ipn, nt);
202 return nt;
203
204 failed_free:
205 free_netdev(dev);
206 return NULL;
207 }
208
209 static void vti_tunnel_uninit(struct net_device *dev)
210 {
211 struct net *net = dev_net(dev);
212 struct vti_net *ipn = net_generic(net, vti_net_id);
213
214 vti_tunnel_unlink(ipn, netdev_priv(dev));
215 dev_put(dev);
216 }
217
218 static int vti_err(struct sk_buff *skb, u32 info)
219 {
220
221 /* All the routers (except for Linux) return only
222 * 8 bytes of packet payload. It means, that precise relaying of
223 * ICMP in the real Internet is absolutely infeasible.
224 */
225 struct iphdr *iph = (struct iphdr *)skb->data;
226 const int type = icmp_hdr(skb)->type;
227 const int code = icmp_hdr(skb)->code;
228 struct ip_tunnel *t;
229 int err;
230
231 switch (type) {
232 default:
233 case ICMP_PARAMETERPROB:
234 return 0;
235
236 case ICMP_DEST_UNREACH:
237 switch (code) {
238 case ICMP_SR_FAILED:
239 case ICMP_PORT_UNREACH:
240 /* Impossible event. */
241 return 0;
242 default:
243 /* All others are translated to HOST_UNREACH. */
244 break;
245 }
246 break;
247 case ICMP_TIME_EXCEEDED:
248 if (code != ICMP_EXC_TTL)
249 return 0;
250 break;
251 }
252
253 err = -ENOENT;
254
255 t = vti_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
256 if (t == NULL)
257 goto out;
258
259 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
260 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
261 t->parms.link, 0, IPPROTO_IPIP, 0);
262 err = 0;
263 goto out;
264 }
265
266 err = 0;
267 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
268 goto out;
269
270 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
271 t->err_count++;
272 else
273 t->err_count = 1;
274 t->err_time = jiffies;
275 out:
276 return err;
277 }
278
279 /* We dont digest the packet therefore let the packet pass */
280 static int vti_rcv(struct sk_buff *skb)
281 {
282 struct ip_tunnel *tunnel;
283 const struct iphdr *iph = ip_hdr(skb);
284
285 tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
286 if (tunnel != NULL) {
287 struct pcpu_tstats *tstats;
288
289 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
290 return -1;
291
292 tstats = this_cpu_ptr(tunnel->dev->tstats);
293 u64_stats_update_begin(&tstats->syncp);
294 tstats->rx_packets++;
295 tstats->rx_bytes += skb->len;
296 u64_stats_update_end(&tstats->syncp);
297
298 skb->mark = 0;
299 secpath_reset(skb);
300 skb->dev = tunnel->dev;
301 return 1;
302 }
303
304 return -1;
305 }
306
307 /* This function assumes it is being called from dev_queue_xmit()
308 * and that skb is filled properly by that function.
309 */
310
311 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
312 {
313 struct ip_tunnel *tunnel = netdev_priv(dev);
314 struct pcpu_tstats *tstats;
315 struct iphdr *tiph = &tunnel->parms.iph;
316 u8 tos;
317 struct rtable *rt; /* Route to the other host */
318 struct net_device *tdev; /* Device to other host */
319 struct iphdr *old_iph = ip_hdr(skb);
320 __be32 dst = tiph->daddr;
321 struct flowi4 fl4;
322
323 if (skb->protocol != htons(ETH_P_IP))
324 goto tx_error;
325
326 tos = old_iph->tos;
327
328 memset(&fl4, 0, sizeof(fl4));
329 flowi4_init_output(&fl4, tunnel->parms.link,
330 be32_to_cpu(tunnel->parms.i_key), RT_TOS(tos),
331 RT_SCOPE_UNIVERSE,
332 IPPROTO_IPIP, 0,
333 dst, tiph->saddr, 0, 0);
334 rt = ip_route_output_key(dev_net(dev), &fl4);
335 if (IS_ERR(rt)) {
336 dev->stats.tx_carrier_errors++;
337 goto tx_error_icmp;
338 }
339 /* if there is no transform then this tunnel is not functional.
340 * Or if the xfrm is not mode tunnel.
341 */
342 if (!rt->dst.xfrm ||
343 rt->dst.xfrm->props.mode != XFRM_MODE_TUNNEL) {
344 dev->stats.tx_carrier_errors++;
345 goto tx_error_icmp;
346 }
347 tdev = rt->dst.dev;
348
349 if (tdev == dev) {
350 ip_rt_put(rt);
351 dev->stats.collisions++;
352 goto tx_error;
353 }
354
355 if (tunnel->err_count > 0) {
356 if (time_before(jiffies,
357 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
358 tunnel->err_count--;
359 dst_link_failure(skb);
360 } else
361 tunnel->err_count = 0;
362 }
363
364 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
365 skb_dst_drop(skb);
366 skb_dst_set(skb, &rt->dst);
367 nf_reset(skb);
368 skb->dev = skb_dst(skb)->dev;
369
370 tstats = this_cpu_ptr(dev->tstats);
371 VTI_XMIT(tstats, &dev->stats);
372 return NETDEV_TX_OK;
373
374 tx_error_icmp:
375 dst_link_failure(skb);
376 tx_error:
377 dev->stats.tx_errors++;
378 dev_kfree_skb(skb);
379 return NETDEV_TX_OK;
380 }
381
382 static int vti_tunnel_bind_dev(struct net_device *dev)
383 {
384 struct net_device *tdev = NULL;
385 struct ip_tunnel *tunnel;
386 struct iphdr *iph;
387
388 tunnel = netdev_priv(dev);
389 iph = &tunnel->parms.iph;
390
391 if (iph->daddr) {
392 struct rtable *rt;
393 struct flowi4 fl4;
394 memset(&fl4, 0, sizeof(fl4));
395 flowi4_init_output(&fl4, tunnel->parms.link,
396 be32_to_cpu(tunnel->parms.i_key),
397 RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
398 IPPROTO_IPIP, 0,
399 iph->daddr, iph->saddr, 0, 0);
400 rt = ip_route_output_key(dev_net(dev), &fl4);
401 if (!IS_ERR(rt)) {
402 tdev = rt->dst.dev;
403 ip_rt_put(rt);
404 }
405 dev->flags |= IFF_POINTOPOINT;
406 }
407
408 if (!tdev && tunnel->parms.link)
409 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
410
411 if (tdev) {
412 dev->hard_header_len = tdev->hard_header_len +
413 sizeof(struct iphdr);
414 dev->mtu = tdev->mtu;
415 }
416 dev->iflink = tunnel->parms.link;
417 return dev->mtu;
418 }
419
420 static int
421 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
422 {
423 int err = 0;
424 struct ip_tunnel_parm p;
425 struct ip_tunnel *t;
426 struct net *net = dev_net(dev);
427 struct vti_net *ipn = net_generic(net, vti_net_id);
428
429 switch (cmd) {
430 case SIOCGETTUNNEL:
431 t = NULL;
432 if (dev == ipn->fb_tunnel_dev) {
433 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
434 sizeof(p))) {
435 err = -EFAULT;
436 break;
437 }
438 t = vti_tunnel_locate(net, &p, 0);
439 }
440 if (t == NULL)
441 t = netdev_priv(dev);
442 memcpy(&p, &t->parms, sizeof(p));
443 p.i_flags |= GRE_KEY | VTI_ISVTI;
444 p.o_flags |= GRE_KEY;
445 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
446 err = -EFAULT;
447 break;
448
449 case SIOCADDTUNNEL:
450 case SIOCCHGTUNNEL:
451 err = -EPERM;
452 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
453 goto done;
454
455 err = -EFAULT;
456 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
457 goto done;
458
459 err = -EINVAL;
460 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
461 p.iph.ihl != 5)
462 goto done;
463
464 t = vti_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
465
466 if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
467 if (t != NULL) {
468 if (t->dev != dev) {
469 err = -EEXIST;
470 break;
471 }
472 } else {
473 if (((dev->flags&IFF_POINTOPOINT) &&
474 !p.iph.daddr) ||
475 (!(dev->flags&IFF_POINTOPOINT) &&
476 p.iph.daddr)) {
477 err = -EINVAL;
478 break;
479 }
480 t = netdev_priv(dev);
481 vti_tunnel_unlink(ipn, t);
482 synchronize_net();
483 t->parms.iph.saddr = p.iph.saddr;
484 t->parms.iph.daddr = p.iph.daddr;
485 t->parms.i_key = p.i_key;
486 t->parms.o_key = p.o_key;
487 t->parms.iph.protocol = IPPROTO_IPIP;
488 memcpy(dev->dev_addr, &p.iph.saddr, 4);
489 memcpy(dev->broadcast, &p.iph.daddr, 4);
490 vti_tunnel_link(ipn, t);
491 netdev_state_change(dev);
492 }
493 }
494
495 if (t) {
496 err = 0;
497 if (cmd == SIOCCHGTUNNEL) {
498 t->parms.i_key = p.i_key;
499 t->parms.o_key = p.o_key;
500 if (t->parms.link != p.link) {
501 t->parms.link = p.link;
502 vti_tunnel_bind_dev(dev);
503 netdev_state_change(dev);
504 }
505 }
506 p.i_flags |= GRE_KEY | VTI_ISVTI;
507 p.o_flags |= GRE_KEY;
508 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms,
509 sizeof(p)))
510 err = -EFAULT;
511 } else
512 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
513 break;
514
515 case SIOCDELTUNNEL:
516 err = -EPERM;
517 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
518 goto done;
519
520 if (dev == ipn->fb_tunnel_dev) {
521 err = -EFAULT;
522 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
523 sizeof(p)))
524 goto done;
525 err = -ENOENT;
526
527 t = vti_tunnel_locate(net, &p, 0);
528 if (t == NULL)
529 goto done;
530 err = -EPERM;
531 if (t->dev == ipn->fb_tunnel_dev)
532 goto done;
533 dev = t->dev;
534 }
535 unregister_netdevice(dev);
536 err = 0;
537 break;
538
539 default:
540 err = -EINVAL;
541 }
542
543 done:
544 return err;
545 }
546
547 static int vti_tunnel_change_mtu(struct net_device *dev, int new_mtu)
548 {
549 if (new_mtu < 68 || new_mtu > 0xFFF8)
550 return -EINVAL;
551 dev->mtu = new_mtu;
552 return 0;
553 }
554
555 static const struct net_device_ops vti_netdev_ops = {
556 .ndo_init = vti_tunnel_init,
557 .ndo_uninit = vti_tunnel_uninit,
558 .ndo_start_xmit = vti_tunnel_xmit,
559 .ndo_do_ioctl = vti_tunnel_ioctl,
560 .ndo_change_mtu = vti_tunnel_change_mtu,
561 .ndo_get_stats64 = ip_tunnel_get_stats64,
562 };
563
564 static void vti_dev_free(struct net_device *dev)
565 {
566 free_percpu(dev->tstats);
567 free_netdev(dev);
568 }
569
570 static void vti_tunnel_setup(struct net_device *dev)
571 {
572 dev->netdev_ops = &vti_netdev_ops;
573 dev->destructor = vti_dev_free;
574
575 dev->type = ARPHRD_TUNNEL;
576 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
577 dev->mtu = ETH_DATA_LEN;
578 dev->flags = IFF_NOARP;
579 dev->iflink = 0;
580 dev->addr_len = 4;
581 dev->features |= NETIF_F_NETNS_LOCAL;
582 dev->features |= NETIF_F_LLTX;
583 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
584 }
585
586 static int vti_tunnel_init(struct net_device *dev)
587 {
588 struct ip_tunnel *tunnel = netdev_priv(dev);
589
590 tunnel->dev = dev;
591 strcpy(tunnel->parms.name, dev->name);
592
593 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
594 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
595
596 dev->tstats = alloc_percpu(struct pcpu_tstats);
597 if (!dev->tstats)
598 return -ENOMEM;
599
600 return 0;
601 }
602
603 static int __net_init vti_fb_tunnel_init(struct net_device *dev)
604 {
605 struct ip_tunnel *tunnel = netdev_priv(dev);
606 struct iphdr *iph = &tunnel->parms.iph;
607 struct vti_net *ipn = net_generic(dev_net(dev), vti_net_id);
608
609 tunnel->dev = dev;
610 strcpy(tunnel->parms.name, dev->name);
611
612 iph->version = 4;
613 iph->protocol = IPPROTO_IPIP;
614 iph->ihl = 5;
615
616 dev->tstats = alloc_percpu(struct pcpu_tstats);
617 if (!dev->tstats)
618 return -ENOMEM;
619
620 dev_hold(dev);
621 rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
622 return 0;
623 }
624
625 static struct xfrm_tunnel vti_handler __read_mostly = {
626 .handler = vti_rcv,
627 .err_handler = vti_err,
628 .priority = 1,
629 };
630
631 static void vti_destroy_tunnels(struct vti_net *ipn, struct list_head *head)
632 {
633 int prio;
634
635 for (prio = 1; prio < 4; prio++) {
636 int h;
637 for (h = 0; h < HASH_SIZE; h++) {
638 struct ip_tunnel *t;
639
640 t = rtnl_dereference(ipn->tunnels[prio][h]);
641 while (t != NULL) {
642 unregister_netdevice_queue(t->dev, head);
643 t = rtnl_dereference(t->next);
644 }
645 }
646 }
647 }
648
649 static int __net_init vti_init_net(struct net *net)
650 {
651 int err;
652 struct vti_net *ipn = net_generic(net, vti_net_id);
653
654 ipn->tunnels[0] = ipn->tunnels_wc;
655 ipn->tunnels[1] = ipn->tunnels_l;
656 ipn->tunnels[2] = ipn->tunnels_r;
657 ipn->tunnels[3] = ipn->tunnels_r_l;
658
659 ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
660 "ip_vti0",
661 vti_tunnel_setup);
662 if (!ipn->fb_tunnel_dev) {
663 err = -ENOMEM;
664 goto err_alloc_dev;
665 }
666 dev_net_set(ipn->fb_tunnel_dev, net);
667
668 err = vti_fb_tunnel_init(ipn->fb_tunnel_dev);
669 if (err)
670 goto err_reg_dev;
671 ipn->fb_tunnel_dev->rtnl_link_ops = &vti_link_ops;
672
673 err = register_netdev(ipn->fb_tunnel_dev);
674 if (err)
675 goto err_reg_dev;
676 return 0;
677
678 err_reg_dev:
679 vti_dev_free(ipn->fb_tunnel_dev);
680 err_alloc_dev:
681 /* nothing */
682 return err;
683 }
684
685 static void __net_exit vti_exit_net(struct net *net)
686 {
687 struct vti_net *ipn = net_generic(net, vti_net_id);
688 LIST_HEAD(list);
689
690 rtnl_lock();
691 vti_destroy_tunnels(ipn, &list);
692 unregister_netdevice_many(&list);
693 rtnl_unlock();
694 }
695
696 static struct pernet_operations vti_net_ops = {
697 .init = vti_init_net,
698 .exit = vti_exit_net,
699 .id = &vti_net_id,
700 .size = sizeof(struct vti_net),
701 };
702
703 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
704 {
705 return 0;
706 }
707
708 static void vti_netlink_parms(struct nlattr *data[],
709 struct ip_tunnel_parm *parms)
710 {
711 memset(parms, 0, sizeof(*parms));
712
713 parms->iph.protocol = IPPROTO_IPIP;
714
715 if (!data)
716 return;
717
718 if (data[IFLA_VTI_LINK])
719 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
720
721 if (data[IFLA_VTI_IKEY])
722 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
723
724 if (data[IFLA_VTI_OKEY])
725 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
726
727 if (data[IFLA_VTI_LOCAL])
728 parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
729
730 if (data[IFLA_VTI_REMOTE])
731 parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
732
733 }
734
735 static int vti_newlink(struct net *src_net, struct net_device *dev,
736 struct nlattr *tb[], struct nlattr *data[])
737 {
738 struct ip_tunnel *nt;
739 struct net *net = dev_net(dev);
740 struct vti_net *ipn = net_generic(net, vti_net_id);
741 int mtu;
742 int err;
743
744 nt = netdev_priv(dev);
745 vti_netlink_parms(data, &nt->parms);
746
747 if (vti_tunnel_locate(net, &nt->parms, 0))
748 return -EEXIST;
749
750 mtu = vti_tunnel_bind_dev(dev);
751 if (!tb[IFLA_MTU])
752 dev->mtu = mtu;
753
754 err = register_netdevice(dev);
755 if (err)
756 goto out;
757
758 dev_hold(dev);
759 vti_tunnel_link(ipn, nt);
760
761 out:
762 return err;
763 }
764
765 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
766 struct nlattr *data[])
767 {
768 struct ip_tunnel *t, *nt;
769 struct net *net = dev_net(dev);
770 struct vti_net *ipn = net_generic(net, vti_net_id);
771 struct ip_tunnel_parm p;
772 int mtu;
773
774 if (dev == ipn->fb_tunnel_dev)
775 return -EINVAL;
776
777 nt = netdev_priv(dev);
778 vti_netlink_parms(data, &p);
779
780 t = vti_tunnel_locate(net, &p, 0);
781
782 if (t) {
783 if (t->dev != dev)
784 return -EEXIST;
785 } else {
786 t = nt;
787
788 vti_tunnel_unlink(ipn, t);
789 t->parms.iph.saddr = p.iph.saddr;
790 t->parms.iph.daddr = p.iph.daddr;
791 t->parms.i_key = p.i_key;
792 t->parms.o_key = p.o_key;
793 if (dev->type != ARPHRD_ETHER) {
794 memcpy(dev->dev_addr, &p.iph.saddr, 4);
795 memcpy(dev->broadcast, &p.iph.daddr, 4);
796 }
797 vti_tunnel_link(ipn, t);
798 netdev_state_change(dev);
799 }
800
801 if (t->parms.link != p.link) {
802 t->parms.link = p.link;
803 mtu = vti_tunnel_bind_dev(dev);
804 if (!tb[IFLA_MTU])
805 dev->mtu = mtu;
806 netdev_state_change(dev);
807 }
808
809 return 0;
810 }
811
812 static size_t vti_get_size(const struct net_device *dev)
813 {
814 return
815 /* IFLA_VTI_LINK */
816 nla_total_size(4) +
817 /* IFLA_VTI_IKEY */
818 nla_total_size(4) +
819 /* IFLA_VTI_OKEY */
820 nla_total_size(4) +
821 /* IFLA_VTI_LOCAL */
822 nla_total_size(4) +
823 /* IFLA_VTI_REMOTE */
824 nla_total_size(4) +
825 0;
826 }
827
828 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
829 {
830 struct ip_tunnel *t = netdev_priv(dev);
831 struct ip_tunnel_parm *p = &t->parms;
832
833 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
834 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
835 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
836 nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
837 nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
838
839 return 0;
840 }
841
842 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
843 [IFLA_VTI_LINK] = { .type = NLA_U32 },
844 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
845 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
846 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
847 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
848 };
849
850 static struct rtnl_link_ops vti_link_ops __read_mostly = {
851 .kind = "vti",
852 .maxtype = IFLA_VTI_MAX,
853 .policy = vti_policy,
854 .priv_size = sizeof(struct ip_tunnel),
855 .setup = vti_tunnel_setup,
856 .validate = vti_tunnel_validate,
857 .newlink = vti_newlink,
858 .changelink = vti_changelink,
859 .get_size = vti_get_size,
860 .fill_info = vti_fill_info,
861 };
862
863 static int __init vti_init(void)
864 {
865 int err;
866
867 pr_info("IPv4 over IPSec tunneling driver\n");
868
869 err = register_pernet_device(&vti_net_ops);
870 if (err < 0)
871 return err;
872 err = xfrm4_mode_tunnel_input_register(&vti_handler);
873 if (err < 0) {
874 unregister_pernet_device(&vti_net_ops);
875 pr_info(KERN_INFO "vti init: can't register tunnel\n");
876 }
877
878 err = rtnl_link_register(&vti_link_ops);
879 if (err < 0)
880 goto rtnl_link_failed;
881
882 return err;
883
884 rtnl_link_failed:
885 xfrm4_mode_tunnel_input_deregister(&vti_handler);
886 unregister_pernet_device(&vti_net_ops);
887 return err;
888 }
889
890 static void __exit vti_fini(void)
891 {
892 rtnl_link_unregister(&vti_link_ops);
893 if (xfrm4_mode_tunnel_input_deregister(&vti_handler))
894 pr_info("vti close: can't deregister tunnel\n");
895
896 unregister_pernet_device(&vti_net_ops);
897 }
898
899 module_init(vti_init);
900 module_exit(vti_fini);
901 MODULE_LICENSE("GPL");
902 MODULE_ALIAS_RTNL_LINK("vti");
903 MODULE_ALIAS_NETDEV("ip_vti0");
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