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gre: don't allow to add the same tunnel twice
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / ip_vti.c
CommitLineData
1181412c
S		 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>
c5441932 41#include <net/ip_tunnels.h>
1181412c
S		 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
50static struct rtnl_link_ops vti_link_ops __read_mostly;
51
52static int vti_net_id __read_mostly;
53struct 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];
e7d4b18c 58 struct ip_tunnel __rcu **tunnels[4];
1181412c
S		 59
60 struct net_device *fb_tunnel_dev;
61};
62
63static int vti_fb_tunnel_init(struct net_device *dev);
64static int vti_tunnel_init(struct net_device *dev);
65static void vti_tunnel_setup(struct net_device *dev);
66static void vti_dev_free(struct net_device *dev);
67static int vti_tunnel_bind_dev(struct net_device *dev);
68
1181412c
S		 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
1181412c
S		 85static 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
e086cadc 93 for_each_ip_tunnel_rcu(t, ipn->tunnels_r_l[h0 ^ h1])
1181412c
S		 94 if (local == t->parms.iph.saddr &&
95 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
96 return t;
e086cadc 97 for_each_ip_tunnel_rcu(t, ipn->tunnels_r[h0])
1181412c
S		 98 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
99 return t;
100
e086cadc 101 for_each_ip_tunnel_rcu(t, ipn->tunnels_l[h1])
1181412c
S		 102 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
103 return t;
104
e086cadc 105 for_each_ip_tunnel_rcu(t, ipn->tunnels_wc[0])
1181412c
S		 106 if (t && (t->dev->flags&IFF_UP))
107 return t;
108 return NULL;
109}
110
e7d4b18c
S		 111static struct ip_tunnel __rcu **__vti_bucket(struct vti_net *ipn,
112 struct ip_tunnel_parm *parms)
1181412c
S		 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
e7d4b18c
S		 130static inline struct ip_tunnel __rcu **vti_bucket(struct vti_net *ipn,
131 struct ip_tunnel *t)
1181412c
S		 132{
133 return __vti_bucket(ipn, &t->parms);
134}
135
136static 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
151static 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
159static 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
204failed_free:
205 free_netdev(dev);
206 return NULL;
207}
208
209static 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
218static 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
1181412c
S		 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;
275out:
1181412c
S		 276 return err;
277}
278
279/* We dont digest the packet therefore let the packet pass */
280static int vti_rcv(struct sk_buff *skb)
281{
282 struct ip_tunnel *tunnel;
283 const struct iphdr *iph = ip_hdr(skb);
284
1181412c
S		 285 tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
286 if (tunnel != NULL) {
287 struct pcpu_tstats *tstats;
a77db440
CG		 288 u32 oldmark = skb->mark;
289 int ret;
1181412c 290
a77db440
CG		 291
292 /* temporarily mark the skb with the tunnel o_key, to
293 * only match policies with this mark.
294 */
295 skb->mark = be32_to_cpu(tunnel->parms.o_key);
296 ret = xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb);
297 skb->mark = oldmark;
298 if (!ret)
b2942004
SM		 299 return -1;
300
1181412c
S		 301 tstats = this_cpu_ptr(tunnel->dev->tstats);
302 u64_stats_update_begin(&tstats->syncp);
303 tstats->rx_packets++;
304 tstats->rx_bytes += skb->len;
305 u64_stats_update_end(&tstats->syncp);
306
b2942004 307 secpath_reset(skb);
1181412c 308 skb->dev = tunnel->dev;
1181412c
S		 309 return 1;
310 }
1181412c
S		 311
312 return -1;
313}
314
315/* This function assumes it is being called from dev_queue_xmit()
316 * and that skb is filled properly by that function.
317 */
318
319static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
320{
321 struct ip_tunnel *tunnel = netdev_priv(dev);
322 struct pcpu_tstats *tstats;
323 struct iphdr *tiph = &tunnel->parms.iph;
324 u8 tos;
325 struct rtable *rt; /* Route to the other host */
326 struct net_device *tdev; /* Device to other host */
327 struct iphdr *old_iph = ip_hdr(skb);
328 __be32 dst = tiph->daddr;
329 struct flowi4 fl4;
330
331 if (skb->protocol != htons(ETH_P_IP))
332 goto tx_error;
333
334 tos = old_iph->tos;
335
336 memset(&fl4, 0, sizeof(fl4));
337 flowi4_init_output(&fl4, tunnel->parms.link,
a77db440 338 be32_to_cpu(tunnel->parms.o_key), RT_TOS(tos),
1181412c
S		 339 RT_SCOPE_UNIVERSE,
340 IPPROTO_IPIP, 0,
341 dst, tiph->saddr, 0, 0);
342 rt = ip_route_output_key(dev_net(dev), &fl4);
343 if (IS_ERR(rt)) {
344 dev->stats.tx_carrier_errors++;
345 goto tx_error_icmp;
346 }
347 /* if there is no transform then this tunnel is not functional.
348 * Or if the xfrm is not mode tunnel.
349 */
350 if (!rt->dst.xfrm ||
351 rt->dst.xfrm->props.mode != XFRM_MODE_TUNNEL) {
352 dev->stats.tx_carrier_errors++;
bdf1643e 353 ip_rt_put(rt);
1181412c
S		 354 goto tx_error_icmp;
355 }
356 tdev = rt->dst.dev;
357
358 if (tdev == dev) {
359 ip_rt_put(rt);
360 dev->stats.collisions++;
361 goto tx_error;
362 }
363
364 if (tunnel->err_count > 0) {
365 if (time_before(jiffies,
366 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
367 tunnel->err_count--;
368 dst_link_failure(skb);
369 } else
370 tunnel->err_count = 0;
371 }
372
baafc77b 373 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
1181412c
S		 374 skb_dst_drop(skb);
375 skb_dst_set(skb, &rt->dst);
376 nf_reset(skb);
377 skb->dev = skb_dst(skb)->dev;
378
379 tstats = this_cpu_ptr(dev->tstats);
380 VTI_XMIT(tstats, &dev->stats);
381 return NETDEV_TX_OK;
382
383tx_error_icmp:
384 dst_link_failure(skb);
385tx_error:
386 dev->stats.tx_errors++;
387 dev_kfree_skb(skb);
388 return NETDEV_TX_OK;
389}
390
391static int vti_tunnel_bind_dev(struct net_device *dev)
392{
393 struct net_device *tdev = NULL;
394 struct ip_tunnel *tunnel;
395 struct iphdr *iph;
396
397 tunnel = netdev_priv(dev);
398 iph = &tunnel->parms.iph;
399
400 if (iph->daddr) {
401 struct rtable *rt;
402 struct flowi4 fl4;
403 memset(&fl4, 0, sizeof(fl4));
404 flowi4_init_output(&fl4, tunnel->parms.link,
8437e761 405 be32_to_cpu(tunnel->parms.i_key),
1181412c
S		 406 RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
407 IPPROTO_IPIP, 0,
408 iph->daddr, iph->saddr, 0, 0);
409 rt = ip_route_output_key(dev_net(dev), &fl4);
410 if (!IS_ERR(rt)) {
411 tdev = rt->dst.dev;
412 ip_rt_put(rt);
413 }
414 dev->flags |= IFF_POINTOPOINT;
415 }
416
417 if (!tdev && tunnel->parms.link)
418 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
419
420 if (tdev) {
421 dev->hard_header_len = tdev->hard_header_len +
422 sizeof(struct iphdr);
423 dev->mtu = tdev->mtu;
424 }
425 dev->iflink = tunnel->parms.link;
426 return dev->mtu;
427}
428
429static int
430vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
431{
432 int err = 0;
433 struct ip_tunnel_parm p;
434 struct ip_tunnel *t;
435 struct net *net = dev_net(dev);
436 struct vti_net *ipn = net_generic(net, vti_net_id);
437
438 switch (cmd) {
439 case SIOCGETTUNNEL:
440 t = NULL;
441 if (dev == ipn->fb_tunnel_dev) {
442 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
443 sizeof(p))) {
444 err = -EFAULT;
445 break;
446 }
447 t = vti_tunnel_locate(net, &p, 0);
448 }
449 if (t == NULL)
450 t = netdev_priv(dev);
451 memcpy(&p, &t->parms, sizeof(p));
452 p.i_flags |= GRE_KEY | VTI_ISVTI;
453 p.o_flags |= GRE_KEY;
454 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
455 err = -EFAULT;
456 break;
457
458 case SIOCADDTUNNEL:
459 case SIOCCHGTUNNEL:
460 err = -EPERM;
52e804c6 461 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1181412c
S		 462 goto done;
463
464 err = -EFAULT;
465 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
466 goto done;
467
468 err = -EINVAL;
469 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
470 p.iph.ihl != 5)
471 goto done;
472
473 t = vti_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
474
475 if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
476 if (t != NULL) {
477 if (t->dev != dev) {
478 err = -EEXIST;
479 break;
480 }
481 } else {
482 if (((dev->flags&IFF_POINTOPOINT) &&
483 !p.iph.daddr) ||
484 (!(dev->flags&IFF_POINTOPOINT) &&
485 p.iph.daddr)) {
486 err = -EINVAL;
487 break;
488 }
489 t = netdev_priv(dev);
490 vti_tunnel_unlink(ipn, t);
491 synchronize_net();
492 t->parms.iph.saddr = p.iph.saddr;
493 t->parms.iph.daddr = p.iph.daddr;
494 t->parms.i_key = p.i_key;
495 t->parms.o_key = p.o_key;
496 t->parms.iph.protocol = IPPROTO_IPIP;
497 memcpy(dev->dev_addr, &p.iph.saddr, 4);
498 memcpy(dev->broadcast, &p.iph.daddr, 4);
499 vti_tunnel_link(ipn, t);
500 netdev_state_change(dev);
501 }
502 }
503
504 if (t) {
505 err = 0;
506 if (cmd == SIOCCHGTUNNEL) {
507 t->parms.i_key = p.i_key;
508 t->parms.o_key = p.o_key;
509 if (t->parms.link != p.link) {
510 t->parms.link = p.link;
511 vti_tunnel_bind_dev(dev);
512 netdev_state_change(dev);
513 }
514 }
515 p.i_flags |= GRE_KEY | VTI_ISVTI;
516 p.o_flags |= GRE_KEY;
517 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms,
518 sizeof(p)))
519 err = -EFAULT;
520 } else
521 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
522 break;
523
524 case SIOCDELTUNNEL:
525 err = -EPERM;
52e804c6 526 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1181412c
S		 527 goto done;
528
529 if (dev == ipn->fb_tunnel_dev) {
530 err = -EFAULT;
531 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
532 sizeof(p)))
533 goto done;
534 err = -ENOENT;
535
536 t = vti_tunnel_locate(net, &p, 0);
537 if (t == NULL)
538 goto done;
539 err = -EPERM;
540 if (t->dev == ipn->fb_tunnel_dev)
541 goto done;
542 dev = t->dev;
543 }
544 unregister_netdevice(dev);
545 err = 0;
546 break;
547
548 default:
549 err = -EINVAL;
550 }
551
552done:
553 return err;
554}
555
556static int vti_tunnel_change_mtu(struct net_device *dev, int new_mtu)
557{
558 if (new_mtu < 68 || new_mtu > 0xFFF8)
559 return -EINVAL;
560 dev->mtu = new_mtu;
561 return 0;
562}
563
564static const struct net_device_ops vti_netdev_ops = {
565 .ndo_init = vti_tunnel_init,
566 .ndo_uninit = vti_tunnel_uninit,
567 .ndo_start_xmit = vti_tunnel_xmit,
568 .ndo_do_ioctl = vti_tunnel_ioctl,
569 .ndo_change_mtu = vti_tunnel_change_mtu,
f61dd388 570 .ndo_get_stats64 = ip_tunnel_get_stats64,
1181412c
S		 571};
572
573static void vti_dev_free(struct net_device *dev)
574{
575 free_percpu(dev->tstats);
576 free_netdev(dev);
577}
578
579static void vti_tunnel_setup(struct net_device *dev)
580{
581 dev->netdev_ops = &vti_netdev_ops;
582 dev->destructor = vti_dev_free;
583
584 dev->type = ARPHRD_TUNNEL;
585 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
586 dev->mtu = ETH_DATA_LEN;
587 dev->flags = IFF_NOARP;
588 dev->iflink = 0;
589 dev->addr_len = 4;
590 dev->features |= NETIF_F_NETNS_LOCAL;
591 dev->features |= NETIF_F_LLTX;
592 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
593}
594
595static int vti_tunnel_init(struct net_device *dev)
596{
597 struct ip_tunnel *tunnel = netdev_priv(dev);
598
599 tunnel->dev = dev;
600 strcpy(tunnel->parms.name, dev->name);
601
602 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
603 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
604
605 dev->tstats = alloc_percpu(struct pcpu_tstats);
606 if (!dev->tstats)
607 return -ENOMEM;
608
609 return 0;
610}
611
612static int __net_init vti_fb_tunnel_init(struct net_device *dev)
613{
614 struct ip_tunnel *tunnel = netdev_priv(dev);
615 struct iphdr *iph = &tunnel->parms.iph;
616 struct vti_net *ipn = net_generic(dev_net(dev), vti_net_id);
617
1181412c
S		 618 iph->version = 4;
619 iph->protocol = IPPROTO_IPIP;
620 iph->ihl = 5;
621
1181412c
S		 622 dev_hold(dev);
623 rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
624 return 0;
625}
626
627static struct xfrm_tunnel vti_handler __read_mostly = {
628 .handler = vti_rcv,
629 .err_handler = vti_err,
630 .priority = 1,
631};
632
633static void vti_destroy_tunnels(struct vti_net *ipn, struct list_head *head)
634{
635 int prio;
636
637 for (prio = 1; prio < 4; prio++) {
638 int h;
639 for (h = 0; h < HASH_SIZE; h++) {
640 struct ip_tunnel *t;
641
642 t = rtnl_dereference(ipn->tunnels[prio][h]);
643 while (t != NULL) {
644 unregister_netdevice_queue(t->dev, head);
645 t = rtnl_dereference(t->next);
646 }
647 }
648 }
649}
650
651static int __net_init vti_init_net(struct net *net)
652{
653 int err;
654 struct vti_net *ipn = net_generic(net, vti_net_id);
655
656 ipn->tunnels[0] = ipn->tunnels_wc;
657 ipn->tunnels[1] = ipn->tunnels_l;
658 ipn->tunnels[2] = ipn->tunnels_r;
659 ipn->tunnels[3] = ipn->tunnels_r_l;
660
661 ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
662 "ip_vti0",
663 vti_tunnel_setup);
664 if (!ipn->fb_tunnel_dev) {
665 err = -ENOMEM;
666 goto err_alloc_dev;
667 }
668 dev_net_set(ipn->fb_tunnel_dev, net);
669
670 err = vti_fb_tunnel_init(ipn->fb_tunnel_dev);
671 if (err)
672 goto err_reg_dev;
673 ipn->fb_tunnel_dev->rtnl_link_ops = &vti_link_ops;
674
675 err = register_netdev(ipn->fb_tunnel_dev);
676 if (err)
677 goto err_reg_dev;
678 return 0;
679
680err_reg_dev:
681 vti_dev_free(ipn->fb_tunnel_dev);
682err_alloc_dev:
683 /* nothing */
684 return err;
685}
686
687static void __net_exit vti_exit_net(struct net *net)
688{
689 struct vti_net *ipn = net_generic(net, vti_net_id);
690 LIST_HEAD(list);
691
692 rtnl_lock();
693 vti_destroy_tunnels(ipn, &list);
694 unregister_netdevice_many(&list);
695 rtnl_unlock();
696}
697
698static struct pernet_operations vti_net_ops = {
699 .init = vti_init_net,
700 .exit = vti_exit_net,
701 .id = &vti_net_id,
702 .size = sizeof(struct vti_net),
703};
704
705static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
706{
707 return 0;
708}
709
710static void vti_netlink_parms(struct nlattr *data[],
711 struct ip_tunnel_parm *parms)
712{
713 memset(parms, 0, sizeof(*parms));
714
715 parms->iph.protocol = IPPROTO_IPIP;
716
717 if (!data)
718 return;
719
720 if (data[IFLA_VTI_LINK])
721 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
722
723 if (data[IFLA_VTI_IKEY])
724 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
725
726 if (data[IFLA_VTI_OKEY])
727 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
728
729 if (data[IFLA_VTI_LOCAL])
730 parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
731
732 if (data[IFLA_VTI_REMOTE])
733 parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
734
735}
736
737static int vti_newlink(struct net *src_net, struct net_device *dev,
738 struct nlattr *tb[], struct nlattr *data[])
739{
740 struct ip_tunnel *nt;
741 struct net *net = dev_net(dev);
742 struct vti_net *ipn = net_generic(net, vti_net_id);
743 int mtu;
744 int err;
745
746 nt = netdev_priv(dev);
747 vti_netlink_parms(data, &nt->parms);
748
749 if (vti_tunnel_locate(net, &nt->parms, 0))
750 return -EEXIST;
751
752 mtu = vti_tunnel_bind_dev(dev);
753 if (!tb[IFLA_MTU])
754 dev->mtu = mtu;
755
756 err = register_netdevice(dev);
757 if (err)
758 goto out;
759
760 dev_hold(dev);
761 vti_tunnel_link(ipn, nt);
762
763out:
764 return err;
765}
766
767static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
768 struct nlattr *data[])
769{
770 struct ip_tunnel *t, *nt;
771 struct net *net = dev_net(dev);
772 struct vti_net *ipn = net_generic(net, vti_net_id);
773 struct ip_tunnel_parm p;
774 int mtu;
775
776 if (dev == ipn->fb_tunnel_dev)
777 return -EINVAL;
778
779 nt = netdev_priv(dev);
780 vti_netlink_parms(data, &p);
781
782 t = vti_tunnel_locate(net, &p, 0);
783
784 if (t) {
785 if (t->dev != dev)
786 return -EEXIST;
787 } else {
788 t = nt;
789
790 vti_tunnel_unlink(ipn, t);
791 t->parms.iph.saddr = p.iph.saddr;
792 t->parms.iph.daddr = p.iph.daddr;
793 t->parms.i_key = p.i_key;
794 t->parms.o_key = p.o_key;
795 if (dev->type != ARPHRD_ETHER) {
796 memcpy(dev->dev_addr, &p.iph.saddr, 4);
797 memcpy(dev->broadcast, &p.iph.daddr, 4);
798 }
799 vti_tunnel_link(ipn, t);
800 netdev_state_change(dev);
801 }
802
803 if (t->parms.link != p.link) {
804 t->parms.link = p.link;
805 mtu = vti_tunnel_bind_dev(dev);
806 if (!tb[IFLA_MTU])
807 dev->mtu = mtu;
808 netdev_state_change(dev);
809 }
810
811 return 0;
812}
813
814static size_t vti_get_size(const struct net_device *dev)
815{
816 return
817 /* IFLA_VTI_LINK */
818 nla_total_size(4) +
819 /* IFLA_VTI_IKEY */
820 nla_total_size(4) +
821 /* IFLA_VTI_OKEY */
822 nla_total_size(4) +
823 /* IFLA_VTI_LOCAL */
824 nla_total_size(4) +
825 /* IFLA_VTI_REMOTE */
826 nla_total_size(4) +
827 0;
828}
829
830static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
831{
832 struct ip_tunnel *t = netdev_priv(dev);
833 struct ip_tunnel_parm *p = &t->parms;
834
835 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
836 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
837 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
838 nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
839 nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
840
841 return 0;
842}
843
844static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
845 [IFLA_VTI_LINK] = { .type = NLA_U32 },
846 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
847 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
848 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
849 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
850};
851
852static struct rtnl_link_ops vti_link_ops __read_mostly = {
853 .kind = "vti",
854 .maxtype = IFLA_VTI_MAX,
855 .policy = vti_policy,
856 .priv_size = sizeof(struct ip_tunnel),
857 .setup = vti_tunnel_setup,
858 .validate = vti_tunnel_validate,
859 .newlink = vti_newlink,
860 .changelink = vti_changelink,
861 .get_size = vti_get_size,
862 .fill_info = vti_fill_info,
863};
864
865static int __init vti_init(void)
866{
867 int err;
868
869 pr_info("IPv4 over IPSec tunneling driver\n");
870
871 err = register_pernet_device(&vti_net_ops);
872 if (err < 0)
873 return err;
874 err = xfrm4_mode_tunnel_input_register(&vti_handler);
875 if (err < 0) {
876 unregister_pernet_device(&vti_net_ops);
877 pr_info(KERN_INFO "vti init: can't register tunnel\n");
878 }
879
880 err = rtnl_link_register(&vti_link_ops);
881 if (err < 0)
882 goto rtnl_link_failed;
883
884 return err;
885
886rtnl_link_failed:
887 xfrm4_mode_tunnel_input_deregister(&vti_handler);
888 unregister_pernet_device(&vti_net_ops);
889 return err;
890}
891
892static void __exit vti_fini(void)
893{
894 rtnl_link_unregister(&vti_link_ops);
895 if (xfrm4_mode_tunnel_input_deregister(&vti_handler))
896 pr_info("vti close: can't deregister tunnel\n");
897
898 unregister_pernet_device(&vti_net_ops);
899}
900
901module_init(vti_init);
902module_exit(vti_fini);
903MODULE_LICENSE("GPL");
904MODULE_ALIAS_RTNL_LINK("vti");
905MODULE_ALIAS_NETDEV("ip_vti0");
kernel source for telekom puls (alcatel/mediatek)