net/ipv4/ipip.c

   1 /*
   2  *      Linux NET3:     IP/IP protocol decoder.
   3  *
   4  *      Authors:
   5  *              Sam Lantinga (slouken@cs.ucdavis.edu)  02/01/95
   6  *
   7  *      Fixes:
   8  *              Alan Cox        :       Merged and made usable non modular (its so tiny its silly as
   9  *                                      a module taking up 2 pages).
  10  *              Alan Cox        :       Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
  11  *                                      to keep ip_forward happy.
  12  *              Alan Cox        :       More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
  13  *              Kai Schulte     :       Fixed #defines for IP_FIREWALL->FIREWALL
  14  *              David Woodhouse :       Perform some basic ICMP handling.
  15  *                                      IPIP Routing without decapsulation.
  16  *              Carlos Picoto   :       GRE over IP support
  17  *              Alexey Kuznetsov:       Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
  18  *                                      I do not want to merge them together.
  19  *
  20  *      This program is free software; you can redistribute it and/or
  21  *      modify it under the terms of the GNU General Public License
  22  *      as published by the Free Software Foundation; either version
  23  *      2 of the License, or (at your option) any later version.
  24  *
  25  */
  26
  27 /* tunnel.c: an IP tunnel driver
  28
  29         The purpose of this driver is to provide an IP tunnel through
  30         which you can tunnel network traffic transparently across subnets.
  31
  32         This was written by looking at Nick Holloway's dummy driver
  33         Thanks for the great code!
  34
  35                 -Sam Lantinga   (slouken@cs.ucdavis.edu)  02/01/95
  36
  37         Minor tweaks:
  38                 Cleaned up the code a little and added some pre-1.3.0 tweaks.
  39                 dev->hard_header/hard_header_len changed to use no headers.
  40                 Comments/bracketing tweaked.
  41                 Made the tunnels use dev->name not tunnel: when error reporting.
  42                 Added tx_dropped stat
  43
  44                 -Alan Cox       (alan@lxorguk.ukuu.org.uk) 21 March 95
  45
  46         Reworked:
  47                 Changed to tunnel to destination gateway in addition to the
  48                         tunnel's pointopoint address
  49                 Almost completely rewritten
  50                 Note:  There is currently no firewall or ICMP handling done.
  51
  52                 -Sam Lantinga   (slouken@cs.ucdavis.edu) 02/13/96
  53
  54 */
  55
  56 /* Things I wish I had known when writing the tunnel driver:
  57
  58         When the tunnel_xmit() function is called, the skb contains the
  59         packet to be sent (plus a great deal of extra info), and dev
  60         contains the tunnel device that _we_ are.
  61
  62         When we are passed a packet, we are expected to fill in the
  63         source address with our source IP address.
  64
  65         What is the proper way to allocate, copy and free a buffer?
  66         After you allocate it, it is a "0 length" chunk of memory
  67         starting at zero.  If you want to add headers to the buffer
  68         later, you'll have to call "skb_reserve(skb, amount)" with
  69         the amount of memory you want reserved.  Then, you call
  70         "skb_put(skb, amount)" with the amount of space you want in
  71         the buffer.  skb_put() returns a pointer to the top (#0) of
  72         that buffer.  skb->len is set to the amount of space you have
  73         "allocated" with skb_put().  You can then write up to skb->len
  74         bytes to that buffer.  If you need more, you can call skb_put()
  75         again with the additional amount of space you need.  You can
  76         find out how much more space you can allocate by calling
  77         "skb_tailroom(skb)".
  78         Now, to add header space, call "skb_push(skb, header_len)".
  79         This creates space at the beginning of the buffer and returns
  80         a pointer to this new space.  If later you need to strip a
  81         header from a buffer, call "skb_pull(skb, header_len)".
  82         skb_headroom() will return how much space is left at the top
  83         of the buffer (before the main data).  Remember, this headroom
  84         space must be reserved before the skb_put() function is called.
  85         */
  86
  87 /*
  88    This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
  89
  90    For comments look at net/ipv4/ip_gre.c --ANK
  91  */
  92
  93
  94 #include <linux/capability.h>
  95 #include <linux/module.h>
  96 #include <linux/types.h>
  97 #include <linux/kernel.h>
  98 #include <linux/slab.h>
  99 #include <linux/uaccess.h>
 100 #include <linux/skbuff.h>
 101 #include <linux/netdevice.h>
 102 #include <linux/in.h>
 103 #include <linux/tcp.h>
 104 #include <linux/udp.h>
 105 #include <linux/if_arp.h>
 106 #include <linux/init.h>
 107 #include <linux/netfilter_ipv4.h>
 108 #include <linux/if_ether.h>
 109
 110 #include <net/sock.h>
 111 #include <net/ip.h>
 112 #include <net/icmp.h>
 113 #include <net/ip_tunnels.h>
 114 #include <net/inet_ecn.h>
 115 #include <net/xfrm.h>
 116 #include <net/net_namespace.h>
 117 #include <net/netns/generic.h>
 118 #include <net/dst_metadata.h>
 119
 120 static bool log_ecn_error = true;
 121 module_param(log_ecn_error, bool, 0644);
 122 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 123
 124 static unsigned int ipip_net_id __read_mostly;
 125
 126 static int ipip_tunnel_init(struct net_device *dev);
 127 static struct rtnl_link_ops ipip_link_ops __read_mostly;
 128
 129 static int ipip_err(struct sk_buff *skb, u32 info)
 130 {
 131
 132 /* All the routers (except for Linux) return only
 133    8 bytes of packet payload. It means, that precise relaying of
 134    ICMP in the real Internet is absolutely infeasible.
 135  */
 136         struct net *net = dev_net(skb->dev);
 137         struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 138         const struct iphdr *iph = (const struct iphdr *)skb->data;
 139         struct ip_tunnel *t;
 140         int err;
 141         const int type = icmp_hdr(skb)->type;
 142         const int code = icmp_hdr(skb)->code;
 143
 144         err = -ENOENT;
 145         t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 146                              iph->daddr, iph->saddr, 0);
 147         if (!t)
 148                 goto out;
 149
 150         if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
 151                 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
 152                                  t->parms.link, 0, iph->protocol, 0);
 153                 err = 0;
 154                 goto out;
 155         }
 156
 157         if (type == ICMP_REDIRECT) {
 158                 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
 159                               iph->protocol, 0);
 160                 err = 0;
 161                 goto out;
 162         }
 163
 164         if (t->parms.iph.daddr == 0)
 165                 goto out;
 166
 167         err = 0;
 168         if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
 169                 goto out;
 170
 171         if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
 172                 t->err_count++;
 173         else
 174                 t->err_count = 1;
 175         t->err_time = jiffies;
 176
 177 out:
 178         return err;
 179 }
 180
 181 static const struct tnl_ptk_info ipip_tpi = {
 182         /* no tunnel info required for ipip. */
 183         .proto = htons(ETH_P_IP),
 184 };
 185
 186 #if IS_ENABLED(CONFIG_MPLS)
 187 static const struct tnl_ptk_info mplsip_tpi = {
 188         /* no tunnel info required for mplsip. */
 189         .proto = htons(ETH_P_MPLS_UC),
 190 };
 191 #endif
 192
 193 static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
 194 {
 195         struct net *net = dev_net(skb->dev);
 196         struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 197         struct metadata_dst *tun_dst = NULL;
 198         struct ip_tunnel *tunnel;
 199         const struct iphdr *iph;
 200
 201         iph = ip_hdr(skb);
 202         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 203                         iph->saddr, iph->daddr, 0);
 204         if (tunnel) {
 205                 const struct tnl_ptk_info *tpi;
 206
 207                 if (tunnel->parms.iph.protocol != ipproto &&
 208                     tunnel->parms.iph.protocol != 0)
 209                         goto drop;
 210
 211                 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 212                         goto drop;
 213 #if IS_ENABLED(CONFIG_MPLS)
 214                 if (ipproto == IPPROTO_MPLS)
 215                         tpi = &mplsip_tpi;
 216                 else
 217 #endif
 218                         tpi = &ipip_tpi;
 219                 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
 220                         goto drop;
 221                 if (tunnel->collect_md) {
 222                         tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
 223                         if (!tun_dst)
 224                                 return 0;
 225                 }
 226                 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 227         }
 228
 229         return -1;
 230
 231 drop:
 232         kfree_skb(skb);
 233         return 0;
 234 }
 235
 236 static int ipip_rcv(struct sk_buff *skb)
 237 {
 238         return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
 239 }
 240
 241 #if IS_ENABLED(CONFIG_MPLS)
 242 static int mplsip_rcv(struct sk_buff *skb)
 243 {
 244         return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
 245 }
 246 #endif
 247
 248 /*
 249  *      This function assumes it is being called from dev_queue_xmit()
 250  *      and that skb is filled properly by that function.
 251  */
 252 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
 253                                     struct net_device *dev)
 254 {
 255         struct ip_tunnel *tunnel = netdev_priv(dev);
 256         const struct iphdr  *tiph = &tunnel->parms.iph;
 257         u8 ipproto;
 258
 259         switch (skb->protocol) {
 260         case htons(ETH_P_IP):
 261                 ipproto = IPPROTO_IPIP;
 262                 break;
 263 #if IS_ENABLED(CONFIG_MPLS)
 264         case htons(ETH_P_MPLS_UC):
 265                 ipproto = IPPROTO_MPLS;
 266                 break;
 267 #endif
 268         default:
 269                 goto tx_error;
 270         }
 271
 272         if (tiph->protocol != ipproto && tiph->protocol != 0)
 273                 goto tx_error;
 274
 275         if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
 276                 goto tx_error;
 277
 278         skb_set_inner_ipproto(skb, ipproto);
 279
 280         if (tunnel->collect_md)
 281                 ip_md_tunnel_xmit(skb, dev, ipproto);
 282         else
 283                 ip_tunnel_xmit(skb, dev, tiph, ipproto);
 284         return NETDEV_TX_OK;
 285
 286 tx_error:
 287         kfree_skb(skb);
 288
 289         dev->stats.tx_errors++;
 290         return NETDEV_TX_OK;
 291 }
 292
 293 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
 294 {
 295         switch (ipproto) {
 296         case 0:
 297         case IPPROTO_IPIP:
 298 #if IS_ENABLED(CONFIG_MPLS)
 299         case IPPROTO_MPLS:
 300 #endif
 301                 return true;
 302         }
 303
 304         return false;
 305 }
 306
 307 static int
 308 ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 309 {
 310         int err = 0;
 311         struct ip_tunnel_parm p;
 312
 313         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
 314                 return -EFAULT;
 315
 316         if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
 317                 if (p.iph.version != 4 ||
 318                     !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) ||
 319                     p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
 320                         return -EINVAL;
 321         }
 322
 323         p.i_key = p.o_key = 0;
 324         p.i_flags = p.o_flags = 0;
 325         err = ip_tunnel_ioctl(dev, &p, cmd);
 326         if (err)
 327                 return err;
 328
 329         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
 330                 return -EFAULT;
 331
 332         return 0;
 333 }
 334
 335 static const struct net_device_ops ipip_netdev_ops = {
 336         .ndo_init       = ipip_tunnel_init,
 337         .ndo_uninit     = ip_tunnel_uninit,
 338         .ndo_start_xmit = ipip_tunnel_xmit,
 339         .ndo_do_ioctl   = ipip_tunnel_ioctl,
 340         .ndo_change_mtu = ip_tunnel_change_mtu,
 341         .ndo_get_stats64 = ip_tunnel_get_stats64,
 342         .ndo_get_iflink = ip_tunnel_get_iflink,
 343 };
 344
 345 #define IPIP_FEATURES (NETIF_F_SG |             \
 346                        NETIF_F_FRAGLIST |       \
 347                        NETIF_F_HIGHDMA |        \
 348                        NETIF_F_GSO_SOFTWARE |   \
 349                        NETIF_F_HW_CSUM)
 350
 351 static void ipip_tunnel_setup(struct net_device *dev)
 352 {
 353         dev->netdev_ops         = &ipip_netdev_ops;
 354
 355         dev->type               = ARPHRD_TUNNEL;
 356         dev->flags              = IFF_NOARP;
 357         dev->addr_len           = 4;
 358         dev->features           |= NETIF_F_LLTX;
 359         netif_keep_dst(dev);
 360
 361         dev->features           |= IPIP_FEATURES;
 362         dev->hw_features        |= IPIP_FEATURES;
 363         ip_tunnel_setup(dev, ipip_net_id);
 364 }
 365
 366 static int ipip_tunnel_init(struct net_device *dev)
 367 {
 368         struct ip_tunnel *tunnel = netdev_priv(dev);
 369
 370         memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 371         memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 372
 373         tunnel->tun_hlen = 0;
 374         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
 375         return ip_tunnel_init(dev);
 376 }
 377
 378 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
 379 {
 380         u8 proto;
 381
 382         if (!data || !data[IFLA_IPTUN_PROTO])
 383                 return 0;
 384
 385         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 386         if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
 387                 return -EINVAL;
 388
 389         return 0;
 390 }
 391
 392 static void ipip_netlink_parms(struct nlattr *data[],
 393                                struct ip_tunnel_parm *parms, bool *collect_md,
 394                                __u32 *fwmark)
 395 {
 396         memset(parms, 0, sizeof(*parms));
 397
 398         parms->iph.version = 4;
 399         parms->iph.protocol = IPPROTO_IPIP;
 400         parms->iph.ihl = 5;
 401         *collect_md = false;
 402
 403         if (!data)
 404                 return;
 405
 406         if (data[IFLA_IPTUN_LINK])
 407                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
 408
 409         if (data[IFLA_IPTUN_LOCAL])
 410                 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
 411
 412         if (data[IFLA_IPTUN_REMOTE])
 413                 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
 414
 415         if (data[IFLA_IPTUN_TTL]) {
 416                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
 417                 if (parms->iph.ttl)
 418                         parms->iph.frag_off = htons(IP_DF);
 419         }
 420
 421         if (data[IFLA_IPTUN_TOS])
 422                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
 423
 424         if (data[IFLA_IPTUN_PROTO])
 425                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 426
 427         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
 428                 parms->iph.frag_off = htons(IP_DF);
 429
 430         if (data[IFLA_IPTUN_COLLECT_METADATA])
 431                 *collect_md = true;
 432
 433         if (data[IFLA_IPTUN_FWMARK])
 434                 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 435 }
 436
 437 /* This function returns true when ENCAP attributes are present in the nl msg */
 438 static bool ipip_netlink_encap_parms(struct nlattr *data[],
 439                                      struct ip_tunnel_encap *ipencap)
 440 {
 441         bool ret = false;
 442
 443         memset(ipencap, 0, sizeof(*ipencap));
 444
 445         if (!data)
 446                 return ret;
 447
 448         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
 449                 ret = true;
 450                 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
 451         }
 452
 453         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
 454                 ret = true;
 455                 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
 456         }
 457
 458         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
 459                 ret = true;
 460                 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
 461         }
 462
 463         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
 464                 ret = true;
 465                 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
 466         }
 467
 468         return ret;
 469 }
 470
 471 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 472                         struct nlattr *tb[], struct nlattr *data[])
 473 {
 474         struct ip_tunnel *t = netdev_priv(dev);
 475         struct ip_tunnel_parm p;
 476         struct ip_tunnel_encap ipencap;
 477         __u32 fwmark = 0;
 478
 479         if (ipip_netlink_encap_parms(data, &ipencap)) {
 480                 int err = ip_tunnel_encap_setup(t, &ipencap);
 481
 482                 if (err < 0)
 483                         return err;
 484         }
 485
 486         ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
 487         return ip_tunnel_newlink(dev, tb, &p, fwmark);
 488 }
 489
 490 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 491                            struct nlattr *data[])
 492 {
 493         struct ip_tunnel *t = netdev_priv(dev);
 494         struct ip_tunnel_parm p;
 495         struct ip_tunnel_encap ipencap;
 496         bool collect_md;
 497         __u32 fwmark = t->fwmark;
 498
 499         if (ipip_netlink_encap_parms(data, &ipencap)) {
 500                 int err = ip_tunnel_encap_setup(t, &ipencap);
 501
 502                 if (err < 0)
 503                         return err;
 504         }
 505
 506         ipip_netlink_parms(data, &p, &collect_md, &fwmark);
 507         if (collect_md)
 508                 return -EINVAL;
 509
 510         if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
 511             (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
 512                 return -EINVAL;
 513
 514         return ip_tunnel_changelink(dev, tb, &p, fwmark);
 515 }
 516
 517 static size_t ipip_get_size(const struct net_device *dev)
 518 {
 519         return
 520                 /* IFLA_IPTUN_LINK */
 521                 nla_total_size(4) +
 522                 /* IFLA_IPTUN_LOCAL */
 523                 nla_total_size(4) +
 524                 /* IFLA_IPTUN_REMOTE */
 525                 nla_total_size(4) +
 526                 /* IFLA_IPTUN_TTL */
 527                 nla_total_size(1) +
 528                 /* IFLA_IPTUN_TOS */
 529                 nla_total_size(1) +
 530                 /* IFLA_IPTUN_PROTO */
 531                 nla_total_size(1) +
 532                 /* IFLA_IPTUN_PMTUDISC */
 533                 nla_total_size(1) +
 534                 /* IFLA_IPTUN_ENCAP_TYPE */
 535                 nla_total_size(2) +
 536                 /* IFLA_IPTUN_ENCAP_FLAGS */
 537                 nla_total_size(2) +
 538                 /* IFLA_IPTUN_ENCAP_SPORT */
 539                 nla_total_size(2) +
 540                 /* IFLA_IPTUN_ENCAP_DPORT */
 541                 nla_total_size(2) +
 542                 /* IFLA_IPTUN_COLLECT_METADATA */
 543                 nla_total_size(0) +
 544                 /* IFLA_IPTUN_FWMARK */
 545                 nla_total_size(4) +
 546                 0;
 547 }
 548
 549 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
 550 {
 551         struct ip_tunnel *tunnel = netdev_priv(dev);
 552         struct ip_tunnel_parm *parm = &tunnel->parms;
 553
 554         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
 555             nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
 556             nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
 557             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
 558             nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
 559             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
 560             nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
 561                        !!(parm->iph.frag_off & htons(IP_DF))) ||
 562             nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
 563                 goto nla_put_failure;
 564
 565         if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
 566                         tunnel->encap.type) ||
 567             nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
 568                          tunnel->encap.sport) ||
 569             nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
 570                          tunnel->encap.dport) ||
 571             nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
 572                         tunnel->encap.flags))
 573                 goto nla_put_failure;
 574
 575         if (tunnel->collect_md)
 576                 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
 577                         goto nla_put_failure;
 578         return 0;
 579
 580 nla_put_failure:
 581         return -EMSGSIZE;
 582 }
 583
 584 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
 585         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
 586         [IFLA_IPTUN_LOCAL]              = { .type = NLA_U32 },
 587         [IFLA_IPTUN_REMOTE]             = { .type = NLA_U32 },
 588         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
 589         [IFLA_IPTUN_TOS]                = { .type = NLA_U8 },
 590         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
 591         [IFLA_IPTUN_PMTUDISC]           = { .type = NLA_U8 },
 592         [IFLA_IPTUN_ENCAP_TYPE]         = { .type = NLA_U16 },
 593         [IFLA_IPTUN_ENCAP_FLAGS]        = { .type = NLA_U16 },
 594         [IFLA_IPTUN_ENCAP_SPORT]        = { .type = NLA_U16 },
 595         [IFLA_IPTUN_ENCAP_DPORT]        = { .type = NLA_U16 },
 596         [IFLA_IPTUN_COLLECT_METADATA]   = { .type = NLA_FLAG },
 597         [IFLA_IPTUN_FWMARK]             = { .type = NLA_U32 },
 598 };
 599
 600 static struct rtnl_link_ops ipip_link_ops __read_mostly = {
 601         .kind           = "ipip",
 602         .maxtype        = IFLA_IPTUN_MAX,
 603         .policy         = ipip_policy,
 604         .priv_size      = sizeof(struct ip_tunnel),
 605         .setup          = ipip_tunnel_setup,
 606         .validate       = ipip_tunnel_validate,
 607         .newlink        = ipip_newlink,
 608         .changelink     = ipip_changelink,
 609         .dellink        = ip_tunnel_dellink,
 610         .get_size       = ipip_get_size,
 611         .fill_info      = ipip_fill_info,
 612         .get_link_net   = ip_tunnel_get_link_net,
 613 };
 614
 615 static struct xfrm_tunnel ipip_handler __read_mostly = {
 616         .handler        =       ipip_rcv,
 617         .err_handler    =       ipip_err,
 618         .priority       =       1,
 619 };
 620
 621 #if IS_ENABLED(CONFIG_MPLS)
 622 static struct xfrm_tunnel mplsip_handler __read_mostly = {
 623         .handler        =       mplsip_rcv,
 624         .err_handler    =       ipip_err,
 625         .priority       =       1,
 626 };
 627 #endif
 628
 629 static int __net_init ipip_init_net(struct net *net)
 630 {
 631         return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 632 }
 633
 634 static void __net_exit ipip_exit_net(struct net *net)
 635 {
 636         struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 637         ip_tunnel_delete_net(itn, &ipip_link_ops);
 638 }
 639
 640 static struct pernet_operations ipip_net_ops = {
 641         .init = ipip_init_net,
 642         .exit = ipip_exit_net,
 643         .id   = &ipip_net_id,
 644         .size = sizeof(struct ip_tunnel_net),
 645 };
 646
 647 static int __init ipip_init(void)
 648 {
 649         int err;
 650
 651         pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
 652
 653         err = register_pernet_device(&ipip_net_ops);
 654         if (err < 0)
 655                 return err;
 656         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
 657         if (err < 0) {
 658                 pr_info("%s: can't register tunnel\n", __func__);
 659                 goto xfrm_tunnel_ipip_failed;
 660         }
 661 #if IS_ENABLED(CONFIG_MPLS)
 662         err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
 663         if (err < 0) {
 664                 pr_info("%s: can't register tunnel\n", __func__);
 665                 goto xfrm_tunnel_mplsip_failed;
 666         }
 667 #endif
 668         err = rtnl_link_register(&ipip_link_ops);
 669         if (err < 0)
 670                 goto rtnl_link_failed;
 671
 672 out:
 673         return err;
 674
 675 rtnl_link_failed:
 676 #if IS_ENABLED(CONFIG_MPLS)
 677         xfrm4_tunnel_deregister(&mplsip_handler, AF_INET);
 678 xfrm_tunnel_mplsip_failed:
 679
 680 #endif
 681         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
 682 xfrm_tunnel_ipip_failed:
 683         unregister_pernet_device(&ipip_net_ops);
 684         goto out;
 685 }
 686
 687 static void __exit ipip_fini(void)
 688 {
 689         rtnl_link_unregister(&ipip_link_ops);
 690         if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
 691                 pr_info("%s: can't deregister tunnel\n", __func__);
 692 #if IS_ENABLED(CONFIG_MPLS)
 693         if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
 694                 pr_info("%s: can't deregister tunnel\n", __func__);
 695 #endif
 696         unregister_pernet_device(&ipip_net_ops);
 697 }
 698
 699 module_init(ipip_init);
 700 module_exit(ipip_fini);
 701 MODULE_LICENSE("GPL");
 702 MODULE_ALIAS_RTNL_LINK("ipip");
 703 MODULE_ALIAS_NETDEV("tunl0");