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Linux/net/ipv4/ip_vti.c

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  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/init.h>
 34 #include <linux/netfilter_ipv4.h>
 35 #include <linux/if_ether.h>
 36 #include <linux/icmpv6.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 static struct rtnl_link_ops vti_link_ops __read_mostly;
 48 
 49 static unsigned int vti_net_id __read_mostly;
 50 static int vti_tunnel_init(struct net_device *dev);
 51 
 52 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
 53                      int encap_type)
 54 {
 55         struct ip_tunnel *tunnel;
 56         const struct iphdr *iph = ip_hdr(skb);
 57         struct net *net = dev_net(skb->dev);
 58         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
 59 
 60         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 61                                   iph->saddr, iph->daddr, 0);
 62         if (tunnel) {
 63                 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 64                         goto drop;
 65 
 66                 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
 67 
 68                 return xfrm_input(skb, nexthdr, spi, encap_type);
 69         }
 70 
 71         return -EINVAL;
 72 drop:
 73         kfree_skb(skb);
 74         return 0;
 75 }
 76 
 77 static int vti_input_ipip(struct sk_buff *skb, int nexthdr, __be32 spi,
 78                      int encap_type)
 79 {
 80         struct ip_tunnel *tunnel;
 81         const struct iphdr *iph = ip_hdr(skb);
 82         struct net *net = dev_net(skb->dev);
 83         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
 84 
 85         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 86                                   iph->saddr, iph->daddr, 0);
 87         if (tunnel) {
 88                 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 89                         goto drop;
 90 
 91                 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
 92 
 93                 skb->dev = tunnel->dev;
 94 
 95                 return xfrm_input(skb, nexthdr, spi, encap_type);
 96         }
 97 
 98         return -EINVAL;
 99 drop:
100         kfree_skb(skb);
101         return 0;
102 }
103 
104 static int vti_rcv(struct sk_buff *skb)
105 {
106         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
107         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
108 
109         return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
110 }
111 
112 static int vti_rcv_ipip(struct sk_buff *skb)
113 {
114         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
115         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
116 
117         return vti_input_ipip(skb, ip_hdr(skb)->protocol, ip_hdr(skb)->saddr, 0);
118 }
119 
120 static int vti_rcv_cb(struct sk_buff *skb, int err)
121 {
122         unsigned short family;
123         struct net_device *dev;
124         struct pcpu_sw_netstats *tstats;
125         struct xfrm_state *x;
126         struct xfrm_mode *inner_mode;
127         struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
128         u32 orig_mark = skb->mark;
129         int ret;
130 
131         if (!tunnel)
132                 return 1;
133 
134         dev = tunnel->dev;
135 
136         if (err) {
137                 dev->stats.rx_errors++;
138                 dev->stats.rx_dropped++;
139 
140                 return 0;
141         }
142 
143         x = xfrm_input_state(skb);
144 
145         inner_mode = x->inner_mode;
146 
147         if (x->sel.family == AF_UNSPEC) {
148                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
149                 if (inner_mode == NULL) {
150                         XFRM_INC_STATS(dev_net(skb->dev),
151                                        LINUX_MIB_XFRMINSTATEMODEERROR);
152                         return -EINVAL;
153                 }
154         }
155 
156         family = inner_mode->afinfo->family;
157 
158         skb->mark = be32_to_cpu(tunnel->parms.i_key);
159         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
160         skb->mark = orig_mark;
161 
162         if (!ret)
163                 return -EPERM;
164 
165         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
166         skb->dev = dev;
167 
168         tstats = this_cpu_ptr(dev->tstats);
169 
170         u64_stats_update_begin(&tstats->syncp);
171         tstats->rx_packets++;
172         tstats->rx_bytes += skb->len;
173         u64_stats_update_end(&tstats->syncp);
174 
175         return 0;
176 }
177 
178 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
179 {
180         xfrm_address_t *daddr = (xfrm_address_t *)&dst;
181         xfrm_address_t *saddr = (xfrm_address_t *)&src;
182 
183         /* if there is no transform then this tunnel is not functional.
184          * Or if the xfrm is not mode tunnel.
185          */
186         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
187             x->props.family != AF_INET)
188                 return false;
189 
190         if (!dst)
191                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
192 
193         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
194                 return false;
195 
196         return true;
197 }
198 
199 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
200                             struct flowi *fl)
201 {
202         struct ip_tunnel *tunnel = netdev_priv(dev);
203         struct ip_tunnel_parm *parms = &tunnel->parms;
204         struct dst_entry *dst = skb_dst(skb);
205         struct net_device *tdev;        /* Device to other host */
206         int pkt_len = skb->len;
207         int err;
208         int mtu;
209 
210         if (!dst) {
211                 dev->stats.tx_carrier_errors++;
212                 goto tx_error_icmp;
213         }
214 
215         dst_hold(dst);
216         dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
217         if (IS_ERR(dst)) {
218                 dev->stats.tx_carrier_errors++;
219                 goto tx_error_icmp;
220         }
221 
222         if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
223                 dev->stats.tx_carrier_errors++;
224                 dst_release(dst);
225                 goto tx_error_icmp;
226         }
227 
228         tdev = dst->dev;
229 
230         if (tdev == dev) {
231                 dst_release(dst);
232                 dev->stats.collisions++;
233                 goto tx_error;
234         }
235 
236         mtu = dst_mtu(dst);
237         if (skb->len > mtu) {
238                 skb_dst_update_pmtu(skb, mtu);
239                 if (skb->protocol == htons(ETH_P_IP)) {
240                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
241                                   htonl(mtu));
242                 } else {
243                         if (mtu < IPV6_MIN_MTU)
244                                 mtu = IPV6_MIN_MTU;
245 
246                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
247                 }
248 
249                 dst_release(dst);
250                 goto tx_error;
251         }
252 
253         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
254         skb_dst_set(skb, dst);
255         skb->dev = skb_dst(skb)->dev;
256 
257         err = dst_output(tunnel->net, skb->sk, skb);
258         if (net_xmit_eval(err) == 0)
259                 err = pkt_len;
260         iptunnel_xmit_stats(dev, err);
261         return NETDEV_TX_OK;
262 
263 tx_error_icmp:
264         dst_link_failure(skb);
265 tx_error:
266         dev->stats.tx_errors++;
267         kfree_skb(skb);
268         return NETDEV_TX_OK;
269 }
270 
271 /* This function assumes it is being called from dev_queue_xmit()
272  * and that skb is filled properly by that function.
273  */
274 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
275 {
276         struct ip_tunnel *tunnel = netdev_priv(dev);
277         struct flowi fl;
278 
279         if (!pskb_inet_may_pull(skb))
280                 goto tx_err;
281 
282         memset(&fl, 0, sizeof(fl));
283 
284         switch (skb->protocol) {
285         case htons(ETH_P_IP):
286                 xfrm_decode_session(skb, &fl, AF_INET);
287                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
288                 break;
289         case htons(ETH_P_IPV6):
290                 xfrm_decode_session(skb, &fl, AF_INET6);
291                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
292                 break;
293         default:
294                 goto tx_err;
295         }
296 
297         /* override mark with tunnel output key */
298         fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
299 
300         return vti_xmit(skb, dev, &fl);
301 
302 tx_err:
303         dev->stats.tx_errors++;
304         kfree_skb(skb);
305         return NETDEV_TX_OK;
306 }
307 
308 static int vti4_err(struct sk_buff *skb, u32 info)
309 {
310         __be32 spi;
311         __u32 mark;
312         struct xfrm_state *x;
313         struct ip_tunnel *tunnel;
314         struct ip_esp_hdr *esph;
315         struct ip_auth_hdr *ah ;
316         struct ip_comp_hdr *ipch;
317         struct net *net = dev_net(skb->dev);
318         const struct iphdr *iph = (const struct iphdr *)skb->data;
319         int protocol = iph->protocol;
320         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
321 
322         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
323                                   iph->daddr, iph->saddr, 0);
324         if (!tunnel)
325                 return -1;
326 
327         mark = be32_to_cpu(tunnel->parms.o_key);
328 
329         switch (protocol) {
330         case IPPROTO_ESP:
331                 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
332                 spi = esph->spi;
333                 break;
334         case IPPROTO_AH:
335                 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
336                 spi = ah->spi;
337                 break;
338         case IPPROTO_COMP:
339                 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
340                 spi = htonl(ntohs(ipch->cpi));
341                 break;
342         default:
343                 return 0;
344         }
345 
346         switch (icmp_hdr(skb)->type) {
347         case ICMP_DEST_UNREACH:
348                 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
349                         return 0;
350         case ICMP_REDIRECT:
351                 break;
352         default:
353                 return 0;
354         }
355 
356         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
357                               spi, protocol, AF_INET);
358         if (!x)
359                 return 0;
360 
361         if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
362                 ipv4_update_pmtu(skb, net, info, 0, protocol);
363         else
364                 ipv4_redirect(skb, net, 0, protocol);
365         xfrm_state_put(x);
366 
367         return 0;
368 }
369 
370 static int
371 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
372 {
373         int err = 0;
374         struct ip_tunnel_parm p;
375 
376         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
377                 return -EFAULT;
378 
379         if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
380                 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
381                     p.iph.ihl != 5)
382                         return -EINVAL;
383         }
384 
385         if (!(p.i_flags & GRE_KEY))
386                 p.i_key = 0;
387         if (!(p.o_flags & GRE_KEY))
388                 p.o_key = 0;
389 
390         p.i_flags = VTI_ISVTI;
391 
392         err = ip_tunnel_ioctl(dev, &p, cmd);
393         if (err)
394                 return err;
395 
396         if (cmd != SIOCDELTUNNEL) {
397                 p.i_flags |= GRE_KEY;
398                 p.o_flags |= GRE_KEY;
399         }
400 
401         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
402                 return -EFAULT;
403         return 0;
404 }
405 
406 static const struct net_device_ops vti_netdev_ops = {
407         .ndo_init       = vti_tunnel_init,
408         .ndo_uninit     = ip_tunnel_uninit,
409         .ndo_start_xmit = vti_tunnel_xmit,
410         .ndo_do_ioctl   = vti_tunnel_ioctl,
411         .ndo_change_mtu = ip_tunnel_change_mtu,
412         .ndo_get_stats64 = ip_tunnel_get_stats64,
413         .ndo_get_iflink = ip_tunnel_get_iflink,
414 };
415 
416 static void vti_tunnel_setup(struct net_device *dev)
417 {
418         dev->netdev_ops         = &vti_netdev_ops;
419         dev->type               = ARPHRD_TUNNEL;
420         ip_tunnel_setup(dev, vti_net_id);
421 }
422 
423 static int vti_tunnel_init(struct net_device *dev)
424 {
425         struct ip_tunnel *tunnel = netdev_priv(dev);
426         struct iphdr *iph = &tunnel->parms.iph;
427 
428         memcpy(dev->dev_addr, &iph->saddr, 4);
429         memcpy(dev->broadcast, &iph->daddr, 4);
430 
431         dev->flags              = IFF_NOARP;
432         dev->addr_len           = 4;
433         dev->features           |= NETIF_F_LLTX;
434         netif_keep_dst(dev);
435 
436         return ip_tunnel_init(dev);
437 }
438 
439 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
440 {
441         struct ip_tunnel *tunnel = netdev_priv(dev);
442         struct iphdr *iph = &tunnel->parms.iph;
443 
444         iph->version            = 4;
445         iph->protocol           = IPPROTO_IPIP;
446         iph->ihl                = 5;
447 }
448 
449 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
450         .handler        =       vti_rcv,
451         .input_handler  =       vti_input,
452         .cb_handler     =       vti_rcv_cb,
453         .err_handler    =       vti4_err,
454         .priority       =       100,
455 };
456 
457 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
458         .handler        =       vti_rcv,
459         .input_handler  =       vti_input,
460         .cb_handler     =       vti_rcv_cb,
461         .err_handler    =       vti4_err,
462         .priority       =       100,
463 };
464 
465 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
466         .handler        =       vti_rcv,
467         .input_handler  =       vti_input,
468         .cb_handler     =       vti_rcv_cb,
469         .err_handler    =       vti4_err,
470         .priority       =       100,
471 };
472 
473 static struct xfrm_tunnel ipip_handler __read_mostly = {
474         .handler        =       vti_rcv_ipip,
475         .err_handler    =       vti4_err,
476         .priority       =       0,
477 };
478 
479 static int __net_init vti_init_net(struct net *net)
480 {
481         int err;
482         struct ip_tunnel_net *itn;
483 
484         err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
485         if (err)
486                 return err;
487         itn = net_generic(net, vti_net_id);
488         if (itn->fb_tunnel_dev)
489                 vti_fb_tunnel_init(itn->fb_tunnel_dev);
490         return 0;
491 }
492 
493 static void __net_exit vti_exit_batch_net(struct list_head *list_net)
494 {
495         ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops);
496 }
497 
498 static struct pernet_operations vti_net_ops = {
499         .init = vti_init_net,
500         .exit_batch = vti_exit_batch_net,
501         .id   = &vti_net_id,
502         .size = sizeof(struct ip_tunnel_net),
503 };
504 
505 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
506                                struct netlink_ext_ack *extack)
507 {
508         return 0;
509 }
510 
511 static void vti_netlink_parms(struct nlattr *data[],
512                               struct ip_tunnel_parm *parms,
513                               __u32 *fwmark)
514 {
515         memset(parms, 0, sizeof(*parms));
516 
517         parms->iph.protocol = IPPROTO_IPIP;
518 
519         if (!data)
520                 return;
521 
522         parms->i_flags = VTI_ISVTI;
523 
524         if (data[IFLA_VTI_LINK])
525                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
526 
527         if (data[IFLA_VTI_IKEY])
528                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
529 
530         if (data[IFLA_VTI_OKEY])
531                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
532 
533         if (data[IFLA_VTI_LOCAL])
534                 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
535 
536         if (data[IFLA_VTI_REMOTE])
537                 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
538 
539         if (data[IFLA_VTI_FWMARK])
540                 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
541 }
542 
543 static int vti_newlink(struct net *src_net, struct net_device *dev,
544                        struct nlattr *tb[], struct nlattr *data[],
545                        struct netlink_ext_ack *extack)
546 {
547         struct ip_tunnel_parm parms;
548         __u32 fwmark = 0;
549 
550         vti_netlink_parms(data, &parms, &fwmark);
551         return ip_tunnel_newlink(dev, tb, &parms, fwmark);
552 }
553 
554 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
555                           struct nlattr *data[],
556                           struct netlink_ext_ack *extack)
557 {
558         struct ip_tunnel *t = netdev_priv(dev);
559         __u32 fwmark = t->fwmark;
560         struct ip_tunnel_parm p;
561 
562         vti_netlink_parms(data, &p, &fwmark);
563         return ip_tunnel_changelink(dev, tb, &p, fwmark);
564 }
565 
566 static size_t vti_get_size(const struct net_device *dev)
567 {
568         return
569                 /* IFLA_VTI_LINK */
570                 nla_total_size(4) +
571                 /* IFLA_VTI_IKEY */
572                 nla_total_size(4) +
573                 /* IFLA_VTI_OKEY */
574                 nla_total_size(4) +
575                 /* IFLA_VTI_LOCAL */
576                 nla_total_size(4) +
577                 /* IFLA_VTI_REMOTE */
578                 nla_total_size(4) +
579                 /* IFLA_VTI_FWMARK */
580                 nla_total_size(4) +
581                 0;
582 }
583 
584 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
585 {
586         struct ip_tunnel *t = netdev_priv(dev);
587         struct ip_tunnel_parm *p = &t->parms;
588 
589         if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
590             nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
591             nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
592             nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
593             nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
594             nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
595                 return -EMSGSIZE;
596 
597         return 0;
598 }
599 
600 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
601         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
602         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
603         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
604         [IFLA_VTI_LOCAL]        = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
605         [IFLA_VTI_REMOTE]       = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
606         [IFLA_VTI_FWMARK]       = { .type = NLA_U32 },
607 };
608 
609 static struct rtnl_link_ops vti_link_ops __read_mostly = {
610         .kind           = "vti",
611         .maxtype        = IFLA_VTI_MAX,
612         .policy         = vti_policy,
613         .priv_size      = sizeof(struct ip_tunnel),
614         .setup          = vti_tunnel_setup,
615         .validate       = vti_tunnel_validate,
616         .newlink        = vti_newlink,
617         .changelink     = vti_changelink,
618         .dellink        = ip_tunnel_dellink,
619         .get_size       = vti_get_size,
620         .fill_info      = vti_fill_info,
621         .get_link_net   = ip_tunnel_get_link_net,
622 };
623 
624 static int __init vti_init(void)
625 {
626         const char *msg;
627         int err;
628 
629         pr_info("IPv4 over IPsec tunneling driver\n");
630 
631         msg = "tunnel device";
632         err = register_pernet_device(&vti_net_ops);
633         if (err < 0)
634                 goto pernet_dev_failed;
635 
636         msg = "tunnel protocols";
637         err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
638         if (err < 0)
639                 goto xfrm_proto_esp_failed;
640         err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
641         if (err < 0)
642                 goto xfrm_proto_ah_failed;
643         err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
644         if (err < 0)
645                 goto xfrm_proto_comp_failed;
646 
647         msg = "ipip tunnel";
648         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
649         if (err < 0)
650                 goto xfrm_tunnel_failed;
651 
652         msg = "netlink interface";
653         err = rtnl_link_register(&vti_link_ops);
654         if (err < 0)
655                 goto rtnl_link_failed;
656 
657         return err;
658 
659 rtnl_link_failed:
660         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
661 xfrm_tunnel_failed:
662         xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
663 xfrm_proto_comp_failed:
664         xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
665 xfrm_proto_ah_failed:
666         xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
667 xfrm_proto_esp_failed:
668         unregister_pernet_device(&vti_net_ops);
669 pernet_dev_failed:
670         pr_err("vti init: failed to register %s\n", msg);
671         return err;
672 }
673 
674 static void __exit vti_fini(void)
675 {
676         rtnl_link_unregister(&vti_link_ops);
677         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
678         xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
679         xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
680         xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
681         unregister_pernet_device(&vti_net_ops);
682 }
683 
684 module_init(vti_init);
685 module_exit(vti_fini);
686 MODULE_LICENSE("GPL");
687 MODULE_ALIAS_RTNL_LINK("vti");
688 MODULE_ALIAS_NETDEV("ip_vti0");
689 

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