net/ipv4/ipip.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      Linux NET3:     IP/IP protocol decoder.
   4  *
   5  *      Authors:
   6  *              Sam Lantinga (slouken@cs.ucdavis.edu)  02/01/95
   7  *
   8  *      Fixes:
   9  *              Alan Cox        :       Merged and made usable non modular (its so tiny its silly as
  10  *                                      a module taking up 2 pages).
  11  *              Alan Cox        :       Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
  12  *                                      to keep ip_forward happy.
  13  *              Alan Cox        :       More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
  14  *              Kai Schulte     :       Fixed #defines for IP_FIREWALL->FIREWALL
  15  *              David Woodhouse :       Perform some basic ICMP handling.
  16  *                                      IPIP Routing without decapsulation.
  17  *              Carlos Picoto   :       GRE over IP support
  18  *              Alexey Kuznetsov:       Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
  19  *                                      I do not want to merge them together.
  20  */
  21
  22 /* tunnel.c: an IP tunnel driver
  23
  24         The purpose of this driver is to provide an IP tunnel through
  25         which you can tunnel network traffic transparently across subnets.
  26
  27         This was written by looking at Nick Holloway's dummy driver
  28         Thanks for the great code!
  29
  30                 -Sam Lantinga   (slouken@cs.ucdavis.edu)  02/01/95
  31
  32         Minor tweaks:
  33                 Cleaned up the code a little and added some pre-1.3.0 tweaks.
  34                 dev->hard_header/hard_header_len changed to use no headers.
  35                 Comments/bracketing tweaked.
  36                 Made the tunnels use dev->name not tunnel: when error reporting.
  37                 Added tx_dropped stat
  38
  39                 -Alan Cox       (alan@lxorguk.ukuu.org.uk) 21 March 95
  40
  41         Reworked:
  42                 Changed to tunnel to destination gateway in addition to the
  43                         tunnel's pointopoint address
  44                 Almost completely rewritten
  45                 Note:  There is currently no firewall or ICMP handling done.
  46
  47                 -Sam Lantinga   (slouken@cs.ucdavis.edu) 02/13/96
  48
  49 */
  50
  51 /* Things I wish I had known when writing the tunnel driver:
  52
  53         When the tunnel_xmit() function is called, the skb contains the
  54         packet to be sent (plus a great deal of extra info), and dev
  55         contains the tunnel device that _we_ are.
  56
  57         When we are passed a packet, we are expected to fill in the
  58         source address with our source IP address.
  59
  60         What is the proper way to allocate, copy and free a buffer?
  61         After you allocate it, it is a "0 length" chunk of memory
  62         starting at zero.  If you want to add headers to the buffer
  63         later, you'll have to call "skb_reserve(skb, amount)" with
  64         the amount of memory you want reserved.  Then, you call
  65         "skb_put(skb, amount)" with the amount of space you want in
  66         the buffer.  skb_put() returns a pointer to the top (#0) of
  67         that buffer.  skb->len is set to the amount of space you have
  68         "allocated" with skb_put().  You can then write up to skb->len
  69         bytes to that buffer.  If you need more, you can call skb_put()
  70         again with the additional amount of space you need.  You can
  71         find out how much more space you can allocate by calling
  72         "skb_tailroom(skb)".
  73         Now, to add header space, call "skb_push(skb, header_len)".
  74         This creates space at the beginning of the buffer and returns
  75         a pointer to this new space.  If later you need to strip a
  76         header from a buffer, call "skb_pull(skb, header_len)".
  77         skb_headroom() will return how much space is left at the top
  78         of the buffer (before the main data).  Remember, this headroom
  79         space must be reserved before the skb_put() function is called.
  80         */
  81
  82 /*
  83    This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
  84
  85    For comments look at net/ipv4/ip_gre.c --ANK
  86  */
  87
  88
  89 #include <linux/capability.h>
  90 #include <linux/module.h>
  91 #include <linux/types.h>
  92 #include <linux/kernel.h>
  93 #include <linux/slab.h>
  94 #include <linux/uaccess.h>
  95 #include <linux/skbuff.h>
  96 #include <linux/netdevice.h>
  97 #include <linux/in.h>
  98 #include <linux/tcp.h>
  99 #include <linux/udp.h>
 100 #include <linux/if_arp.h>
 101 #include <linux/init.h>
 102 #include <linux/netfilter_ipv4.h>
 103 #include <linux/if_ether.h>
 104
 105 #include <net/sock.h>
 106 #include <net/ip.h>
 107 #include <net/icmp.h>
 108 #include <net/ip_tunnels.h>
 109 #include <net/inet_ecn.h>
 110 #include <net/xfrm.h>
 111 #include <net/net_namespace.h>
 112 #include <net/netns/generic.h>
 113 #include <net/dst_metadata.h>
 114
 115 static bool log_ecn_error = true;
 116 module_param(log_ecn_error, bool, 0644);
 117 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 118
 119 static unsigned int ipip_net_id __read_mostly;
 120
 121 static int ipip_tunnel_init(struct net_device *dev);
 122 static struct rtnl_link_ops ipip_link_ops __read_mostly;
 123
 124 static int ipip_err(struct sk_buff *skb, u32 info)
 125 {
 126         /* All the routers (except for Linux) return only
 127          * 8 bytes of packet payload. It means, that precise relaying of
 128          * ICMP in the real Internet is absolutely infeasible.
 129          */
 130         struct net *net = dev_net(skb->dev);
 131         struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 132         const struct iphdr *iph = (const struct iphdr *)skb->data;
 133         const int type = icmp_hdr(skb)->type;
 134         const int code = icmp_hdr(skb)->code;
 135         struct ip_tunnel *t;
 136         int err = 0;
 137
 138         t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 139                              iph->daddr, iph->saddr, 0);
 140         if (!t) {
 141                 err = -ENOENT;
 142                 goto out;
 143         }
 144
 145         switch (type) {
 146         case ICMP_DEST_UNREACH:
 147                 switch (code) {
 148                 case ICMP_SR_FAILED:
 149                         /* Impossible event. */
 150                         goto out;
 151                 default:
 152                         /* All others are translated to HOST_UNREACH.
 153                          * rfc2003 contains "deep thoughts" about NET_UNREACH,
 154                          * I believe they are just ether pollution. --ANK
 155                          */
 156                         break;
 157                 }
 158                 break;
 159
 160         case ICMP_TIME_EXCEEDED:
 161                 if (code != ICMP_EXC_TTL)
 162                         goto out;
 163                 break;
 164
 165         case ICMP_REDIRECT:
 166                 break;
 167
 168         default:
 169                 goto out;
 170         }
 171
 172         if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
 173                 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol);
 174                 goto out;
 175         }
 176
 177         if (type == ICMP_REDIRECT) {
 178                 ipv4_redirect(skb, net, t->parms.link, iph->protocol);
 179                 goto out;
 180         }
 181
 182         if (t->parms.iph.daddr == 0) {
 183                 err = -ENOENT;
 184                 goto out;
 185         }
 186
 187         if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
 188                 goto out;
 189
 190         if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
 191                 t->err_count++;
 192         else
 193                 t->err_count = 1;
 194         t->err_time = jiffies;
 195
 196 out:
 197         return err;
 198 }
 199
 200 static const struct tnl_ptk_info ipip_tpi = {
 201         /* no tunnel info required for ipip. */
 202         .proto = htons(ETH_P_IP),
 203 };
 204
 205 #if IS_ENABLED(CONFIG_MPLS)
 206 static const struct tnl_ptk_info mplsip_tpi = {
 207         /* no tunnel info required for mplsip. */
 208         .proto = htons(ETH_P_MPLS_UC),
 209 };
 210 #endif
 211
 212 static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
 213 {
 214         struct net *net = dev_net(skb->dev);
 215         struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 216         struct metadata_dst *tun_dst = NULL;
 217         struct ip_tunnel *tunnel;
 218         const struct iphdr *iph;
 219
 220         iph = ip_hdr(skb);
 221         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 222                         iph->saddr, iph->daddr, 0);
 223         if (tunnel) {
 224                 const struct tnl_ptk_info *tpi;
 225
 226                 if (tunnel->parms.iph.protocol != ipproto &&
 227                     tunnel->parms.iph.protocol != 0)
 228                         goto drop;
 229
 230                 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 231                         goto drop;
 232 #if IS_ENABLED(CONFIG_MPLS)
 233                 if (ipproto == IPPROTO_MPLS)
 234                         tpi = &mplsip_tpi;
 235                 else
 236 #endif
 237                         tpi = &ipip_tpi;
 238                 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
 239                         goto drop;
 240                 if (tunnel->collect_md) {
 241                         tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
 242                         if (!tun_dst)
 243                                 return 0;
 244                 }
 245                 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 246         }
 247
 248         return -1;
 249
 250 drop:
 251         kfree_skb(skb);
 252         return 0;
 253 }
 254
 255 static int ipip_rcv(struct sk_buff *skb)
 256 {
 257         return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
 258 }
 259
 260 #if IS_ENABLED(CONFIG_MPLS)
 261 static int mplsip_rcv(struct sk_buff *skb)
 262 {
 263         return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
 264 }
 265 #endif
 266
 267 /*
 268  *      This function assumes it is being called from dev_queue_xmit()
 269  *      and that skb is filled properly by that function.
 270  */
 271 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
 272                                     struct net_device *dev)
 273 {
 274         struct ip_tunnel *tunnel = netdev_priv(dev);
 275         const struct iphdr  *tiph = &tunnel->parms.iph;
 276         u8 ipproto;
 277
 278         if (!pskb_inet_may_pull(skb))
 279                 goto tx_error;
 280
 281         switch (skb->protocol) {
 282         case htons(ETH_P_IP):
 283                 ipproto = IPPROTO_IPIP;
 284                 break;
 285 #if IS_ENABLED(CONFIG_MPLS)
 286         case htons(ETH_P_MPLS_UC):
 287                 ipproto = IPPROTO_MPLS;
 288                 break;
 289 #endif
 290         default:
 291                 goto tx_error;
 292         }
 293
 294         if (tiph->protocol != ipproto && tiph->protocol != 0)
 295                 goto tx_error;
 296
 297         if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
 298                 goto tx_error;
 299
 300         skb_set_inner_ipproto(skb, ipproto);
 301
 302         if (tunnel->collect_md)
 303                 ip_md_tunnel_xmit(skb, dev, ipproto, 0);
 304         else
 305                 ip_tunnel_xmit(skb, dev, tiph, ipproto);
 306         return NETDEV_TX_OK;
 307
 308 tx_error:
 309         kfree_skb(skb);
 310
 311         dev->stats.tx_errors++;
 312         return NETDEV_TX_OK;
 313 }
 314
 315 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
 316 {
 317         switch (ipproto) {
 318         case 0:
 319         case IPPROTO_IPIP:
 320 #if IS_ENABLED(CONFIG_MPLS)
 321         case IPPROTO_MPLS:
 322 #endif
 323                 return true;
 324         }
 325
 326         return false;
 327 }
 328
 329 static int
 330 ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
 331 {
 332         if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
 333                 if (p->iph.version != 4 ||
 334                     !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
 335                     p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
 336                         return -EINVAL;
 337         }
 338
 339         p->i_key = p->o_key = 0;
 340         p->i_flags = p->o_flags = 0;
 341         return ip_tunnel_ctl(dev, p, cmd);
 342 }
 343
 344 static const struct net_device_ops ipip_netdev_ops = {
 345         .ndo_init       = ipip_tunnel_init,
 346         .ndo_uninit     = ip_tunnel_uninit,
 347         .ndo_start_xmit = ipip_tunnel_xmit,
 348         .ndo_do_ioctl   = ip_tunnel_ioctl,
 349         .ndo_change_mtu = ip_tunnel_change_mtu,
 350         .ndo_get_stats64 = ip_tunnel_get_stats64,
 351         .ndo_get_iflink = ip_tunnel_get_iflink,
 352         .ndo_tunnel_ctl = ipip_tunnel_ctl,
 353 };
 354
 355 #define IPIP_FEATURES (NETIF_F_SG |             \
 356                        NETIF_F_FRAGLIST |       \
 357                        NETIF_F_HIGHDMA |        \
 358                        NETIF_F_GSO_SOFTWARE |   \
 359                        NETIF_F_HW_CSUM)
 360
 361 static void ipip_tunnel_setup(struct net_device *dev)
 362 {
 363         dev->netdev_ops         = &ipip_netdev_ops;
 364
 365         dev->type               = ARPHRD_TUNNEL;
 366         dev->flags              = IFF_NOARP;
 367         dev->addr_len           = 4;
 368         dev->features           |= NETIF_F_LLTX;
 369         netif_keep_dst(dev);
 370
 371         dev->features           |= IPIP_FEATURES;
 372         dev->hw_features        |= IPIP_FEATURES;
 373         ip_tunnel_setup(dev, ipip_net_id);
 374 }
 375
 376 static int ipip_tunnel_init(struct net_device *dev)
 377 {
 378         struct ip_tunnel *tunnel = netdev_priv(dev);
 379
 380         memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 381         memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 382
 383         tunnel->tun_hlen = 0;
 384         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
 385         return ip_tunnel_init(dev);
 386 }
 387
 388 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
 389                                 struct netlink_ext_ack *extack)
 390 {
 391         u8 proto;
 392
 393         if (!data || !data[IFLA_IPTUN_PROTO])
 394                 return 0;
 395
 396         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 397         if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
 398                 return -EINVAL;
 399
 400         return 0;
 401 }
 402
 403 static void ipip_netlink_parms(struct nlattr *data[],
 404                                struct ip_tunnel_parm *parms, bool *collect_md,
 405                                __u32 *fwmark)
 406 {
 407         memset(parms, 0, sizeof(*parms));
 408
 409         parms->iph.version = 4;
 410         parms->iph.protocol = IPPROTO_IPIP;
 411         parms->iph.ihl = 5;
 412         *collect_md = false;
 413
 414         if (!data)
 415                 return;
 416
 417         if (data[IFLA_IPTUN_LINK])
 418                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
 419
 420         if (data[IFLA_IPTUN_LOCAL])
 421                 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
 422
 423         if (data[IFLA_IPTUN_REMOTE])
 424                 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
 425
 426         if (data[IFLA_IPTUN_TTL]) {
 427                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
 428                 if (parms->iph.ttl)
 429                         parms->iph.frag_off = htons(IP_DF);
 430         }
 431
 432         if (data[IFLA_IPTUN_TOS])
 433                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
 434
 435         if (data[IFLA_IPTUN_PROTO])
 436                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 437
 438         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
 439                 parms->iph.frag_off = htons(IP_DF);
 440
 441         if (data[IFLA_IPTUN_COLLECT_METADATA])
 442                 *collect_md = true;
 443
 444         if (data[IFLA_IPTUN_FWMARK])
 445                 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 446 }
 447
 448 /* This function returns true when ENCAP attributes are present in the nl msg */
 449 static bool ipip_netlink_encap_parms(struct nlattr *data[],
 450                                      struct ip_tunnel_encap *ipencap)
 451 {
 452         bool ret = false;
 453
 454         memset(ipencap, 0, sizeof(*ipencap));
 455
 456         if (!data)
 457                 return ret;
 458
 459         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
 460                 ret = true;
 461                 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
 462         }
 463
 464         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
 465                 ret = true;
 466                 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
 467         }
 468
 469         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
 470                 ret = true;
 471                 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
 472         }
 473
 474         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
 475                 ret = true;
 476                 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
 477         }
 478
 479         return ret;
 480 }
 481
 482 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 483                         struct nlattr *tb[], struct nlattr *data[],
 484                         struct netlink_ext_ack *extack)
 485 {
 486         struct ip_tunnel *t = netdev_priv(dev);
 487         struct ip_tunnel_parm p;
 488         struct ip_tunnel_encap ipencap;
 489         __u32 fwmark = 0;
 490
 491         if (ipip_netlink_encap_parms(data, &ipencap)) {
 492                 int err = ip_tunnel_encap_setup(t, &ipencap);
 493
 494                 if (err < 0)
 495                         return err;
 496         }
 497
 498         ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
 499         return ip_tunnel_newlink(dev, tb, &p, fwmark);
 500 }
 501
 502 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 503                            struct nlattr *data[],
 504                            struct netlink_ext_ack *extack)
 505 {
 506         struct ip_tunnel *t = netdev_priv(dev);
 507         struct ip_tunnel_parm p;
 508         struct ip_tunnel_encap ipencap;
 509         bool collect_md;
 510         __u32 fwmark = t->fwmark;
 511
 512         if (ipip_netlink_encap_parms(data, &ipencap)) {
 513                 int err = ip_tunnel_encap_setup(t, &ipencap);
 514
 515                 if (err < 0)
 516                         return err;
 517         }
 518
 519         ipip_netlink_parms(data, &p, &collect_md, &fwmark);
 520         if (collect_md)
 521                 return -EINVAL;
 522
 523         if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
 524             (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
 525                 return -EINVAL;
 526
 527         return ip_tunnel_changelink(dev, tb, &p, fwmark);
 528 }
 529
 530 static size_t ipip_get_size(const struct net_device *dev)
 531 {
 532         return
 533                 /* IFLA_IPTUN_LINK */
 534                 nla_total_size(4) +
 535                 /* IFLA_IPTUN_LOCAL */
 536                 nla_total_size(4) +
 537                 /* IFLA_IPTUN_REMOTE */
 538                 nla_total_size(4) +
 539                 /* IFLA_IPTUN_TTL */
 540                 nla_total_size(1) +
 541                 /* IFLA_IPTUN_TOS */
 542                 nla_total_size(1) +
 543                 /* IFLA_IPTUN_PROTO */
 544                 nla_total_size(1) +
 545                 /* IFLA_IPTUN_PMTUDISC */
 546                 nla_total_size(1) +
 547                 /* IFLA_IPTUN_ENCAP_TYPE */
 548                 nla_total_size(2) +
 549                 /* IFLA_IPTUN_ENCAP_FLAGS */
 550                 nla_total_size(2) +
 551                 /* IFLA_IPTUN_ENCAP_SPORT */
 552                 nla_total_size(2) +
 553                 /* IFLA_IPTUN_ENCAP_DPORT */
 554                 nla_total_size(2) +
 555                 /* IFLA_IPTUN_COLLECT_METADATA */
 556                 nla_total_size(0) +
 557                 /* IFLA_IPTUN_FWMARK */
 558                 nla_total_size(4) +
 559                 0;
 560 }
 561
 562 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
 563 {
 564         struct ip_tunnel *tunnel = netdev_priv(dev);
 565         struct ip_tunnel_parm *parm = &tunnel->parms;
 566
 567         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
 568             nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
 569             nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
 570             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
 571             nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
 572             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
 573             nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
 574                        !!(parm->iph.frag_off & htons(IP_DF))) ||
 575             nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
 576                 goto nla_put_failure;
 577
 578         if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
 579                         tunnel->encap.type) ||
 580             nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
 581                          tunnel->encap.sport) ||
 582             nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
 583                          tunnel->encap.dport) ||
 584             nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
 585                         tunnel->encap.flags))
 586                 goto nla_put_failure;
 587
 588         if (tunnel->collect_md)
 589                 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
 590                         goto nla_put_failure;
 591         return 0;
 592
 593 nla_put_failure:
 594         return -EMSGSIZE;
 595 }
 596
 597 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
 598         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
 599         [IFLA_IPTUN_LOCAL]              = { .type = NLA_U32 },
 600         [IFLA_IPTUN_REMOTE]             = { .type = NLA_U32 },
 601         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
 602         [IFLA_IPTUN_TOS]                = { .type = NLA_U8 },
 603         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
 604         [IFLA_IPTUN_PMTUDISC]           = { .type = NLA_U8 },
 605         [IFLA_IPTUN_ENCAP_TYPE]         = { .type = NLA_U16 },
 606         [IFLA_IPTUN_ENCAP_FLAGS]        = { .type = NLA_U16 },
 607         [IFLA_IPTUN_ENCAP_SPORT]        = { .type = NLA_U16 },
 608         [IFLA_IPTUN_ENCAP_DPORT]        = { .type = NLA_U16 },
 609         [IFLA_IPTUN_COLLECT_METADATA]   = { .type = NLA_FLAG },
 610         [IFLA_IPTUN_FWMARK]             = { .type = NLA_U32 },
 611 };
 612
 613 static struct rtnl_link_ops ipip_link_ops __read_mostly = {
 614         .kind           = "ipip",
 615         .maxtype        = IFLA_IPTUN_MAX,
 616         .policy         = ipip_policy,
 617         .priv_size      = sizeof(struct ip_tunnel),
 618         .setup          = ipip_tunnel_setup,
 619         .validate       = ipip_tunnel_validate,
 620         .newlink        = ipip_newlink,
 621         .changelink     = ipip_changelink,
 622         .dellink        = ip_tunnel_dellink,
 623         .get_size       = ipip_get_size,
 624         .fill_info      = ipip_fill_info,
 625         .get_link_net   = ip_tunnel_get_link_net,
 626 };
 627
 628 static struct xfrm_tunnel ipip_handler __read_mostly = {
 629         .handler        =       ipip_rcv,
 630         .err_handler    =       ipip_err,
 631         .priority       =       1,
 632 };
 633
 634 #if IS_ENABLED(CONFIG_MPLS)
 635 static struct xfrm_tunnel mplsip_handler __read_mostly = {
 636         .handler        =       mplsip_rcv,
 637         .err_handler    =       ipip_err,
 638         .priority       =       1,
 639 };
 640 #endif
 641
 642 static int __net_init ipip_init_net(struct net *net)
 643 {
 644         return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 645 }
 646
 647 static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
 648 {
 649         ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
 650 }
 651
 652 static struct pernet_operations ipip_net_ops = {
 653         .init = ipip_init_net,
 654         .exit_batch = ipip_exit_batch_net,
 655         .id   = &ipip_net_id,
 656         .size = sizeof(struct ip_tunnel_net),
 657 };
 658
 659 static int __init ipip_init(void)
 660 {
 661         int err;
 662
 663         pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
 664
 665         err = register_pernet_device(&ipip_net_ops);
 666         if (err < 0)
 667                 return err;
 668         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
 669         if (err < 0) {
 670                 pr_info("%s: can't register tunnel\n", __func__);
 671                 goto xfrm_tunnel_ipip_failed;
 672         }
 673 #if IS_ENABLED(CONFIG_MPLS)
 674         err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
 675         if (err < 0) {
 676                 pr_info("%s: can't register tunnel\n", __func__);
 677                 goto xfrm_tunnel_mplsip_failed;
 678         }
 679 #endif
 680         err = rtnl_link_register(&ipip_link_ops);
 681         if (err < 0)
 682                 goto rtnl_link_failed;
 683
 684 out:
 685         return err;
 686
 687 rtnl_link_failed:
 688 #if IS_ENABLED(CONFIG_MPLS)
 689         xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
 690 xfrm_tunnel_mplsip_failed:
 691
 692 #endif
 693         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
 694 xfrm_tunnel_ipip_failed:
 695         unregister_pernet_device(&ipip_net_ops);
 696         goto out;
 697 }
 698
 699 static void __exit ipip_fini(void)
 700 {
 701         rtnl_link_unregister(&ipip_link_ops);
 702         if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
 703                 pr_info("%s: can't deregister tunnel\n", __func__);
 704 #if IS_ENABLED(CONFIG_MPLS)
 705         if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
 706                 pr_info("%s: can't deregister tunnel\n", __func__);
 707 #endif
 708         unregister_pernet_device(&ipip_net_ops);
 709 }
 710
 711 module_init(ipip_init);
 712 module_exit(ipip_fini);
 713 MODULE_LICENSE("GPL");
 714 MODULE_ALIAS_RTNL_LINK("ipip");
 715 MODULE_ALIAS_NETDEV("tunl0");