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                                 struct netlink_ext_ack *extack)
 380 {
 381         u8 proto;
 382
 383         if (!data || !data[IFLA_IPTUN_PROTO])
 384                 return 0;
 385
 386         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 387         if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
 388                 return -EINVAL;
 389
 390         return 0;
 391 }
 392
 393 static void ipip_netlink_parms(struct nlattr *data[],
 394                                struct ip_tunnel_parm *parms, bool *collect_md,
 395                                __u32 *fwmark)
 396 {
 397         memset(parms, 0, sizeof(*parms));
 398
 399         parms->iph.version = 4;
 400         parms->iph.protocol = IPPROTO_IPIP;
 401         parms->iph.ihl = 5;
 402         *collect_md = false;
 403
 404         if (!data)
 405                 return;
 406
 407         if (data[IFLA_IPTUN_LINK])
 408                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
 409
 410         if (data[IFLA_IPTUN_LOCAL])
 411                 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
 412
 413         if (data[IFLA_IPTUN_REMOTE])
 414                 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
 415
 416         if (data[IFLA_IPTUN_TTL]) {
 417                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
 418                 if (parms->iph.ttl)
 419                         parms->iph.frag_off = htons(IP_DF);
 420         }
 421
 422         if (data[IFLA_IPTUN_TOS])
 423                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
 424
 425         if (data[IFLA_IPTUN_PROTO])
 426                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 427
 428         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
 429                 parms->iph.frag_off = htons(IP_DF);
 430
 431         if (data[IFLA_IPTUN_COLLECT_METADATA])
 432                 *collect_md = true;
 433
 434         if (data[IFLA_IPTUN_FWMARK])
 435                 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 436 }
 437
 438 /* This function returns true when ENCAP attributes are present in the nl msg */
 439 static bool ipip_netlink_encap_parms(struct nlattr *data[],
 440                                      struct ip_tunnel_encap *ipencap)
 441 {
 442         bool ret = false;
 443
 444         memset(ipencap, 0, sizeof(*ipencap));
 445
 446         if (!data)
 447                 return ret;
 448
 449         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
 450                 ret = true;
 451                 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
 452         }
 453
 454         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
 455                 ret = true;
 456                 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
 457         }
 458
 459         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
 460                 ret = true;
 461                 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
 462         }
 463
 464         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
 465                 ret = true;
 466                 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
 467         }
 468
 469         return ret;
 470 }
 471
 472 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 473                         struct nlattr *tb[], struct nlattr *data[],
 474                         struct netlink_ext_ack *extack)
 475 {
 476         struct ip_tunnel *t = netdev_priv(dev);
 477         struct ip_tunnel_parm p;
 478         struct ip_tunnel_encap ipencap;
 479         __u32 fwmark = 0;
 480
 481         if (ipip_netlink_encap_parms(data, &ipencap)) {
 482                 int err = ip_tunnel_encap_setup(t, &ipencap);
 483
 484                 if (err < 0)
 485                         return err;
 486         }
 487
 488         ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
 489         return ip_tunnel_newlink(dev, tb, &p, fwmark);
 490 }
 491
 492 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 493                            struct nlattr *data[],
 494                            struct netlink_ext_ack *extack)
 495 {
 496         struct ip_tunnel *t = netdev_priv(dev);
 497         struct ip_tunnel_parm p;
 498         struct ip_tunnel_encap ipencap;
 499         bool collect_md;
 500         __u32 fwmark = t->fwmark;
 501
 502         if (ipip_netlink_encap_parms(data, &ipencap)) {
 503                 int err = ip_tunnel_encap_setup(t, &ipencap);
 504
 505                 if (err < 0)
 506                         return err;
 507         }
 508
 509         ipip_netlink_parms(data, &p, &collect_md, &fwmark);
 510         if (collect_md)
 511                 return -EINVAL;
 512
 513         if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
 514             (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
 515                 return -EINVAL;
 516
 517         return ip_tunnel_changelink(dev, tb, &p, fwmark);
 518 }
 519
 520 static size_t ipip_get_size(const struct net_device *dev)
 521 {
 522         return
 523                 /* IFLA_IPTUN_LINK */
 524                 nla_total_size(4) +
 525                 /* IFLA_IPTUN_LOCAL */
 526                 nla_total_size(4) +
 527                 /* IFLA_IPTUN_REMOTE */
 528                 nla_total_size(4) +
 529                 /* IFLA_IPTUN_TTL */
 530                 nla_total_size(1) +
 531                 /* IFLA_IPTUN_TOS */
 532                 nla_total_size(1) +
 533                 /* IFLA_IPTUN_PROTO */
 534                 nla_total_size(1) +
 535                 /* IFLA_IPTUN_PMTUDISC */
 536                 nla_total_size(1) +
 537                 /* IFLA_IPTUN_ENCAP_TYPE */
 538                 nla_total_size(2) +
 539                 /* IFLA_IPTUN_ENCAP_FLAGS */
 540                 nla_total_size(2) +
 541                 /* IFLA_IPTUN_ENCAP_SPORT */
 542                 nla_total_size(2) +
 543                 /* IFLA_IPTUN_ENCAP_DPORT */
 544                 nla_total_size(2) +
 545                 /* IFLA_IPTUN_COLLECT_METADATA */
 546                 nla_total_size(0) +
 547                 /* IFLA_IPTUN_FWMARK */
 548                 nla_total_size(4) +
 549                 0;
 550 }
 551
 552 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
 553 {
 554         struct ip_tunnel *tunnel = netdev_priv(dev);
 555         struct ip_tunnel_parm *parm = &tunnel->parms;
 556
 557         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
 558             nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
 559             nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
 560             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
 561             nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
 562             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
 563             nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
 564                        !!(parm->iph.frag_off & htons(IP_DF))) ||
 565             nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
 566                 goto nla_put_failure;
 567
 568         if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
 569                         tunnel->encap.type) ||
 570             nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
 571                          tunnel->encap.sport) ||
 572             nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
 573                          tunnel->encap.dport) ||
 574             nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
 575                         tunnel->encap.flags))
 576                 goto nla_put_failure;
 577
 578         if (tunnel->collect_md)
 579                 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
 580                         goto nla_put_failure;
 581         return 0;
 582
 583 nla_put_failure:
 584         return -EMSGSIZE;
 585 }
 586
 587 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
 588         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
 589         [IFLA_IPTUN_LOCAL]              = { .type = NLA_U32 },
 590         [IFLA_IPTUN_REMOTE]             = { .type = NLA_U32 },
 591         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
 592         [IFLA_IPTUN_TOS]                = { .type = NLA_U8 },
 593         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
 594         [IFLA_IPTUN_PMTUDISC]           = { .type = NLA_U8 },
 595         [IFLA_IPTUN_ENCAP_TYPE]         = { .type = NLA_U16 },
 596         [IFLA_IPTUN_ENCAP_FLAGS]        = { .type = NLA_U16 },
 597         [IFLA_IPTUN_ENCAP_SPORT]        = { .type = NLA_U16 },
 598         [IFLA_IPTUN_ENCAP_DPORT]        = { .type = NLA_U16 },
 599         [IFLA_IPTUN_COLLECT_METADATA]   = { .type = NLA_FLAG },
 600         [IFLA_IPTUN_FWMARK]             = { .type = NLA_U32 },
 601 };
 602
 603 static struct rtnl_link_ops ipip_link_ops __read_mostly = {
 604         .kind           = "ipip",
 605         .maxtype        = IFLA_IPTUN_MAX,
 606         .policy         = ipip_policy,
 607         .priv_size      = sizeof(struct ip_tunnel),
 608         .setup          = ipip_tunnel_setup,
 609         .validate       = ipip_tunnel_validate,
 610         .newlink        = ipip_newlink,
 611         .changelink     = ipip_changelink,
 612         .dellink        = ip_tunnel_dellink,
 613         .get_size       = ipip_get_size,
 614         .fill_info      = ipip_fill_info,
 615         .get_link_net   = ip_tunnel_get_link_net,
 616 };
 617
 618 static struct xfrm_tunnel ipip_handler __read_mostly = {
 619         .handler        =       ipip_rcv,
 620         .err_handler    =       ipip_err,
 621         .priority       =       1,
 622 };
 623
 624 #if IS_ENABLED(CONFIG_MPLS)
 625 static struct xfrm_tunnel mplsip_handler __read_mostly = {
 626         .handler        =       mplsip_rcv,
 627         .err_handler    =       ipip_err,
 628         .priority       =       1,
 629 };
 630 #endif
 631
 632 static int __net_init ipip_init_net(struct net *net)
 633 {
 634         return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 635 }
 636
 637 static void __net_exit ipip_exit_net(struct net *net)
 638 {
 639         struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 640         ip_tunnel_delete_net(itn, &ipip_link_ops);
 641 }
 642
 643 static struct pernet_operations ipip_net_ops = {
 644         .init = ipip_init_net,
 645         .exit = ipip_exit_net,
 646         .id   = &ipip_net_id,
 647         .size = sizeof(struct ip_tunnel_net),
 648 };
 649
 650 static int __init ipip_init(void)
 651 {
 652         int err;
 653
 654         pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
 655
 656         err = register_pernet_device(&ipip_net_ops);
 657         if (err < 0)
 658                 return err;
 659         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
 660         if (err < 0) {
 661                 pr_info("%s: can't register tunnel\n", __func__);
 662                 goto xfrm_tunnel_ipip_failed;
 663         }
 664 #if IS_ENABLED(CONFIG_MPLS)
 665         err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
 666         if (err < 0) {
 667                 pr_info("%s: can't register tunnel\n", __func__);
 668                 goto xfrm_tunnel_mplsip_failed;
 669         }
 670 #endif
 671         err = rtnl_link_register(&ipip_link_ops);
 672         if (err < 0)
 673                 goto rtnl_link_failed;
 674
 675 out:
 676         return err;
 677
 678 rtnl_link_failed:
 679 #if IS_ENABLED(CONFIG_MPLS)
 680         xfrm4_tunnel_deregister(&mplsip_handler, AF_INET);
 681 xfrm_tunnel_mplsip_failed:
 682
 683 #endif
 684         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
 685 xfrm_tunnel_ipip_failed:
 686         unregister_pernet_device(&ipip_net_ops);
 687         goto out;
 688 }
 689
 690 static void __exit ipip_fini(void)
 691 {
 692         rtnl_link_unregister(&ipip_link_ops);
 693         if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
 694                 pr_info("%s: can't deregister tunnel\n", __func__);
 695 #if IS_ENABLED(CONFIG_MPLS)
 696         if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
 697                 pr_info("%s: can't deregister tunnel\n", __func__);
 698 #endif
 699         unregister_pernet_device(&ipip_net_ops);
 700 }
 701
 702 module_init(ipip_init);
 703 module_exit(ipip_fini);
 704 MODULE_LICENSE("GPL");
 705 MODULE_ALIAS_RTNL_LINK("ipip");
 706 MODULE_ALIAS_NETDEV("tunl0");