net/ipv4/ip_vti.c

   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");