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Linux/net/ipv4/ip_vti.c

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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_rcv(struct sk_buff *skb)
 78 {
 79         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
 80         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
 81 
 82         return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
 83 }
 84 
 85 static int vti_rcv_cb(struct sk_buff *skb, int err)
 86 {
 87         unsigned short family;
 88         struct net_device *dev;
 89         struct pcpu_sw_netstats *tstats;
 90         struct xfrm_state *x;
 91         struct xfrm_mode *inner_mode;
 92         struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
 93         u32 orig_mark = skb->mark;
 94         int ret;
 95 
 96         if (!tunnel)
 97                 return 1;
 98 
 99         dev = tunnel->dev;
100 
101         if (err) {
102                 dev->stats.rx_errors++;
103                 dev->stats.rx_dropped++;
104 
105                 return 0;
106         }
107 
108         x = xfrm_input_state(skb);
109 
110         inner_mode = x->inner_mode;
111 
112         if (x->sel.family == AF_UNSPEC) {
113                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
114                 if (inner_mode == NULL) {
115                         XFRM_INC_STATS(dev_net(skb->dev),
116                                        LINUX_MIB_XFRMINSTATEMODEERROR);
117                         return -EINVAL;
118                 }
119         }
120 
121         family = inner_mode->afinfo->family;
122 
123         skb->mark = be32_to_cpu(tunnel->parms.i_key);
124         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
125         skb->mark = orig_mark;
126 
127         if (!ret)
128                 return -EPERM;
129 
130         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
131         skb->dev = dev;
132 
133         tstats = this_cpu_ptr(dev->tstats);
134 
135         u64_stats_update_begin(&tstats->syncp);
136         tstats->rx_packets++;
137         tstats->rx_bytes += skb->len;
138         u64_stats_update_end(&tstats->syncp);
139 
140         return 0;
141 }
142 
143 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
144 {
145         xfrm_address_t *daddr = (xfrm_address_t *)&dst;
146         xfrm_address_t *saddr = (xfrm_address_t *)&src;
147 
148         /* if there is no transform then this tunnel is not functional.
149          * Or if the xfrm is not mode tunnel.
150          */
151         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
152             x->props.family != AF_INET)
153                 return false;
154 
155         if (!dst)
156                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
157 
158         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
159                 return false;
160 
161         return true;
162 }
163 
164 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
165                             struct flowi *fl)
166 {
167         struct ip_tunnel *tunnel = netdev_priv(dev);
168         struct ip_tunnel_parm *parms = &tunnel->parms;
169         struct dst_entry *dst = skb_dst(skb);
170         struct net_device *tdev;        /* Device to other host */
171         int pkt_len = skb->len;
172         int err;
173         int mtu;
174 
175         if (!dst) {
176                 dev->stats.tx_carrier_errors++;
177                 goto tx_error_icmp;
178         }
179 
180         dst_hold(dst);
181         dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
182         if (IS_ERR(dst)) {
183                 dev->stats.tx_carrier_errors++;
184                 goto tx_error_icmp;
185         }
186 
187         if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
188                 dev->stats.tx_carrier_errors++;
189                 dst_release(dst);
190                 goto tx_error_icmp;
191         }
192 
193         tdev = dst->dev;
194 
195         if (tdev == dev) {
196                 dst_release(dst);
197                 dev->stats.collisions++;
198                 goto tx_error;
199         }
200 
201         if (tunnel->err_count > 0) {
202                 if (time_before(jiffies,
203                                 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
204                         tunnel->err_count--;
205                         dst_link_failure(skb);
206                 } else
207                         tunnel->err_count = 0;
208         }
209 
210         mtu = dst_mtu(dst);
211         if (skb->len > mtu) {
212                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
213                 if (skb->protocol == htons(ETH_P_IP)) {
214                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
215                                   htonl(mtu));
216                 } else {
217                         if (mtu < IPV6_MIN_MTU)
218                                 mtu = IPV6_MIN_MTU;
219 
220                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
221                 }
222 
223                 dst_release(dst);
224                 goto tx_error;
225         }
226 
227         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
228         skb_dst_set(skb, dst);
229         skb->dev = skb_dst(skb)->dev;
230 
231         err = dst_output(tunnel->net, skb->sk, skb);
232         if (net_xmit_eval(err) == 0)
233                 err = pkt_len;
234         iptunnel_xmit_stats(dev, err);
235         return NETDEV_TX_OK;
236 
237 tx_error_icmp:
238         dst_link_failure(skb);
239 tx_error:
240         dev->stats.tx_errors++;
241         kfree_skb(skb);
242         return NETDEV_TX_OK;
243 }
244 
245 /* This function assumes it is being called from dev_queue_xmit()
246  * and that skb is filled properly by that function.
247  */
248 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
249 {
250         struct ip_tunnel *tunnel = netdev_priv(dev);
251         struct flowi fl;
252 
253         memset(&fl, 0, sizeof(fl));
254 
255         switch (skb->protocol) {
256         case htons(ETH_P_IP):
257                 xfrm_decode_session(skb, &fl, AF_INET);
258                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
259                 break;
260         case htons(ETH_P_IPV6):
261                 xfrm_decode_session(skb, &fl, AF_INET6);
262                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
263                 break;
264         default:
265                 dev->stats.tx_errors++;
266                 dev_kfree_skb(skb);
267                 return NETDEV_TX_OK;
268         }
269 
270         /* override mark with tunnel output key */
271         fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
272 
273         return vti_xmit(skb, dev, &fl);
274 }
275 
276 static int vti4_err(struct sk_buff *skb, u32 info)
277 {
278         __be32 spi;
279         __u32 mark;
280         struct xfrm_state *x;
281         struct ip_tunnel *tunnel;
282         struct ip_esp_hdr *esph;
283         struct ip_auth_hdr *ah ;
284         struct ip_comp_hdr *ipch;
285         struct net *net = dev_net(skb->dev);
286         const struct iphdr *iph = (const struct iphdr *)skb->data;
287         int protocol = iph->protocol;
288         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
289 
290         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
291                                   iph->daddr, iph->saddr, 0);
292         if (!tunnel)
293                 return -1;
294 
295         mark = be32_to_cpu(tunnel->parms.o_key);
296 
297         switch (protocol) {
298         case IPPROTO_ESP:
299                 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
300                 spi = esph->spi;
301                 break;
302         case IPPROTO_AH:
303                 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
304                 spi = ah->spi;
305                 break;
306         case IPPROTO_COMP:
307                 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
308                 spi = htonl(ntohs(ipch->cpi));
309                 break;
310         default:
311                 return 0;
312         }
313 
314         switch (icmp_hdr(skb)->type) {
315         case ICMP_DEST_UNREACH:
316                 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
317                         return 0;
318         case ICMP_REDIRECT:
319                 break;
320         default:
321                 return 0;
322         }
323 
324         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
325                               spi, protocol, AF_INET);
326         if (!x)
327                 return 0;
328 
329         if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
330                 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
331         else
332                 ipv4_redirect(skb, net, 0, 0, protocol, 0);
333         xfrm_state_put(x);
334 
335         return 0;
336 }
337 
338 static int
339 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
340 {
341         int err = 0;
342         struct ip_tunnel_parm p;
343 
344         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
345                 return -EFAULT;
346 
347         if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
348                 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
349                     p.iph.ihl != 5)
350                         return -EINVAL;
351         }
352 
353         if (!(p.i_flags & GRE_KEY))
354                 p.i_key = 0;
355         if (!(p.o_flags & GRE_KEY))
356                 p.o_key = 0;
357 
358         p.i_flags = VTI_ISVTI;
359 
360         err = ip_tunnel_ioctl(dev, &p, cmd);
361         if (err)
362                 return err;
363 
364         if (cmd != SIOCDELTUNNEL) {
365                 p.i_flags |= GRE_KEY;
366                 p.o_flags |= GRE_KEY;
367         }
368 
369         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
370                 return -EFAULT;
371         return 0;
372 }
373 
374 static const struct net_device_ops vti_netdev_ops = {
375         .ndo_init       = vti_tunnel_init,
376         .ndo_uninit     = ip_tunnel_uninit,
377         .ndo_start_xmit = vti_tunnel_xmit,
378         .ndo_do_ioctl   = vti_tunnel_ioctl,
379         .ndo_change_mtu = ip_tunnel_change_mtu,
380         .ndo_get_stats64 = ip_tunnel_get_stats64,
381         .ndo_get_iflink = ip_tunnel_get_iflink,
382 };
383 
384 static void vti_tunnel_setup(struct net_device *dev)
385 {
386         dev->netdev_ops         = &vti_netdev_ops;
387         dev->type               = ARPHRD_TUNNEL;
388         ip_tunnel_setup(dev, vti_net_id);
389 }
390 
391 static int vti_tunnel_init(struct net_device *dev)
392 {
393         struct ip_tunnel *tunnel = netdev_priv(dev);
394         struct iphdr *iph = &tunnel->parms.iph;
395 
396         memcpy(dev->dev_addr, &iph->saddr, 4);
397         memcpy(dev->broadcast, &iph->daddr, 4);
398 
399         dev->hard_header_len    = LL_MAX_HEADER + sizeof(struct iphdr);
400         dev->mtu                = ETH_DATA_LEN;
401         dev->flags              = IFF_NOARP;
402         dev->addr_len           = 4;
403         dev->features           |= NETIF_F_LLTX;
404         netif_keep_dst(dev);
405 
406         return ip_tunnel_init(dev);
407 }
408 
409 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
410 {
411         struct ip_tunnel *tunnel = netdev_priv(dev);
412         struct iphdr *iph = &tunnel->parms.iph;
413 
414         iph->version            = 4;
415         iph->protocol           = IPPROTO_IPIP;
416         iph->ihl                = 5;
417 }
418 
419 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
420         .handler        =       vti_rcv,
421         .input_handler  =       vti_input,
422         .cb_handler     =       vti_rcv_cb,
423         .err_handler    =       vti4_err,
424         .priority       =       100,
425 };
426 
427 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
428         .handler        =       vti_rcv,
429         .input_handler  =       vti_input,
430         .cb_handler     =       vti_rcv_cb,
431         .err_handler    =       vti4_err,
432         .priority       =       100,
433 };
434 
435 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
436         .handler        =       vti_rcv,
437         .input_handler  =       vti_input,
438         .cb_handler     =       vti_rcv_cb,
439         .err_handler    =       vti4_err,
440         .priority       =       100,
441 };
442 
443 static int __net_init vti_init_net(struct net *net)
444 {
445         int err;
446         struct ip_tunnel_net *itn;
447 
448         err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
449         if (err)
450                 return err;
451         itn = net_generic(net, vti_net_id);
452         vti_fb_tunnel_init(itn->fb_tunnel_dev);
453         return 0;
454 }
455 
456 static void __net_exit vti_exit_net(struct net *net)
457 {
458         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
459         ip_tunnel_delete_net(itn, &vti_link_ops);
460 }
461 
462 static struct pernet_operations vti_net_ops = {
463         .init = vti_init_net,
464         .exit = vti_exit_net,
465         .id   = &vti_net_id,
466         .size = sizeof(struct ip_tunnel_net),
467 };
468 
469 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
470                                struct netlink_ext_ack *extack)
471 {
472         return 0;
473 }
474 
475 static void vti_netlink_parms(struct nlattr *data[],
476                               struct ip_tunnel_parm *parms,
477                               __u32 *fwmark)
478 {
479         memset(parms, 0, sizeof(*parms));
480 
481         parms->iph.protocol = IPPROTO_IPIP;
482 
483         if (!data)
484                 return;
485 
486         parms->i_flags = VTI_ISVTI;
487 
488         if (data[IFLA_VTI_LINK])
489                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
490 
491         if (data[IFLA_VTI_IKEY])
492                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
493 
494         if (data[IFLA_VTI_OKEY])
495                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
496 
497         if (data[IFLA_VTI_LOCAL])
498                 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
499 
500         if (data[IFLA_VTI_REMOTE])
501                 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
502 
503         if (data[IFLA_VTI_FWMARK])
504                 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
505 }
506 
507 static int vti_newlink(struct net *src_net, struct net_device *dev,
508                        struct nlattr *tb[], struct nlattr *data[],
509                        struct netlink_ext_ack *extack)
510 {
511         struct ip_tunnel_parm parms;
512         __u32 fwmark = 0;
513 
514         vti_netlink_parms(data, &parms, &fwmark);
515         return ip_tunnel_newlink(dev, tb, &parms, fwmark);
516 }
517 
518 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
519                           struct nlattr *data[],
520                           struct netlink_ext_ack *extack)
521 {
522         struct ip_tunnel *t = netdev_priv(dev);
523         __u32 fwmark = t->fwmark;
524         struct ip_tunnel_parm p;
525 
526         vti_netlink_parms(data, &p, &fwmark);
527         return ip_tunnel_changelink(dev, tb, &p, fwmark);
528 }
529 
530 static size_t vti_get_size(const struct net_device *dev)
531 {
532         return
533                 /* IFLA_VTI_LINK */
534                 nla_total_size(4) +
535                 /* IFLA_VTI_IKEY */
536                 nla_total_size(4) +
537                 /* IFLA_VTI_OKEY */
538                 nla_total_size(4) +
539                 /* IFLA_VTI_LOCAL */
540                 nla_total_size(4) +
541                 /* IFLA_VTI_REMOTE */
542                 nla_total_size(4) +
543                 /* IFLA_VTI_FWMARK */
544                 nla_total_size(4) +
545                 0;
546 }
547 
548 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
549 {
550         struct ip_tunnel *t = netdev_priv(dev);
551         struct ip_tunnel_parm *p = &t->parms;
552 
553         if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
554             nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
555             nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
556             nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
557             nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
558             nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
559                 return -EMSGSIZE;
560 
561         return 0;
562 }
563 
564 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
565         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
566         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
567         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
568         [IFLA_VTI_LOCAL]        = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
569         [IFLA_VTI_REMOTE]       = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
570         [IFLA_VTI_FWMARK]       = { .type = NLA_U32 },
571 };
572 
573 static struct rtnl_link_ops vti_link_ops __read_mostly = {
574         .kind           = "vti",
575         .maxtype        = IFLA_VTI_MAX,
576         .policy         = vti_policy,
577         .priv_size      = sizeof(struct ip_tunnel),
578         .setup          = vti_tunnel_setup,
579         .validate       = vti_tunnel_validate,
580         .newlink        = vti_newlink,
581         .changelink     = vti_changelink,
582         .dellink        = ip_tunnel_dellink,
583         .get_size       = vti_get_size,
584         .fill_info      = vti_fill_info,
585         .get_link_net   = ip_tunnel_get_link_net,
586 };
587 
588 static bool is_vti_tunnel(const struct net_device *dev)
589 {
590         return dev->netdev_ops == &vti_netdev_ops;
591 }
592 
593 static int vti_device_event(struct notifier_block *unused,
594                             unsigned long event, void *ptr)
595 {
596         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
597         struct ip_tunnel *tunnel = netdev_priv(dev);
598 
599         if (!is_vti_tunnel(dev))
600                 return NOTIFY_DONE;
601 
602         switch (event) {
603         case NETDEV_DOWN:
604                 if (!net_eq(tunnel->net, dev_net(dev)))
605                         xfrm_garbage_collect(tunnel->net);
606                 break;
607         }
608         return NOTIFY_DONE;
609 }
610 
611 static struct notifier_block vti_notifier_block __read_mostly = {
612         .notifier_call = vti_device_event,
613 };
614 
615 static int __init vti_init(void)
616 {
617         const char *msg;
618         int err;
619 
620         pr_info("IPv4 over IPsec tunneling driver\n");
621 
622         register_netdevice_notifier(&vti_notifier_block);
623 
624         msg = "tunnel device";
625         err = register_pernet_device(&vti_net_ops);
626         if (err < 0)
627                 goto pernet_dev_failed;
628 
629         msg = "tunnel protocols";
630         err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
631         if (err < 0)
632                 goto xfrm_proto_esp_failed;
633         err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
634         if (err < 0)
635                 goto xfrm_proto_ah_failed;
636         err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
637         if (err < 0)
638                 goto xfrm_proto_comp_failed;
639 
640         msg = "netlink interface";
641         err = rtnl_link_register(&vti_link_ops);
642         if (err < 0)
643                 goto rtnl_link_failed;
644 
645         return err;
646 
647 rtnl_link_failed:
648         xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
649 xfrm_proto_comp_failed:
650         xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
651 xfrm_proto_ah_failed:
652         xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
653 xfrm_proto_esp_failed:
654         unregister_pernet_device(&vti_net_ops);
655 pernet_dev_failed:
656         unregister_netdevice_notifier(&vti_notifier_block);
657         pr_err("vti init: failed to register %s\n", msg);
658         return err;
659 }
660 
661 static void __exit vti_fini(void)
662 {
663         rtnl_link_unregister(&vti_link_ops);
664         xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
665         xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
666         xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
667         unregister_pernet_device(&vti_net_ops);
668         unregister_netdevice_notifier(&vti_notifier_block);
669 }
670 
671 module_init(vti_init);
672 module_exit(vti_fini);
673 MODULE_LICENSE("GPL");
674 MODULE_ALIAS_RTNL_LINK("vti");
675 MODULE_ALIAS_NETDEV("ip_vti0");
676 

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