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         switch (skb->protocol) {
 279         case htons(ETH_P_IP):
 280                 ipproto = IPPROTO_IPIP;
 281                 break;
 282 #if IS_ENABLED(CONFIG_MPLS)
 283         case htons(ETH_P_MPLS_UC):
 284                 ipproto = IPPROTO_MPLS;
 285                 break;
 286 #endif
 287         default:
 288                 goto tx_error;
 289         }
 290
 291         if (tiph->protocol != ipproto && tiph->protocol != 0)
 292                 goto tx_error;
 293
 294         if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
 295                 goto tx_error;
 296
 297         skb_set_inner_ipproto(skb, ipproto);
 298
 299         if (tunnel->collect_md)
 300                 ip_md_tunnel_xmit(skb, dev, ipproto, 0);
 301         else
 302                 ip_tunnel_xmit(skb, dev, tiph, ipproto);
 303         return NETDEV_TX_OK;
 304
 305 tx_error:
 306         kfree_skb(skb);
 307
 308         dev->stats.tx_errors++;
 309         return NETDEV_TX_OK;
 310 }
 311
 312 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
 313 {
 314         switch (ipproto) {
 315         case 0:
 316         case IPPROTO_IPIP:
 317 #if IS_ENABLED(CONFIG_MPLS)
 318         case IPPROTO_MPLS:
 319 #endif
 320                 return true;
 321         }
 322
 323         return false;
 324 }
 325
 326 static int
 327 ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 328 {
 329         int err = 0;
 330         struct ip_tunnel_parm p;
 331
 332         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
 333                 return -EFAULT;
 334
 335         if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
 336                 if (p.iph.version != 4 ||
 337                     !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) ||
 338                     p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
 339                         return -EINVAL;
 340         }
 341
 342         p.i_key = p.o_key = 0;
 343         p.i_flags = p.o_flags = 0;
 344         err = ip_tunnel_ioctl(dev, &p, cmd);
 345         if (err)
 346                 return err;
 347
 348         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
 349                 return -EFAULT;
 350
 351         return 0;
 352 }
 353
 354 static const struct net_device_ops ipip_netdev_ops = {
 355         .ndo_init       = ipip_tunnel_init,
 356         .ndo_uninit     = ip_tunnel_uninit,
 357         .ndo_start_xmit = ipip_tunnel_xmit,
 358         .ndo_do_ioctl   = ipip_tunnel_ioctl,
 359         .ndo_change_mtu = ip_tunnel_change_mtu,
 360         .ndo_get_stats64 = ip_tunnel_get_stats64,
 361         .ndo_get_iflink = ip_tunnel_get_iflink,
 362 };
 363
 364 #define IPIP_FEATURES (NETIF_F_SG |             \
 365                        NETIF_F_FRAGLIST |       \
 366                        NETIF_F_HIGHDMA |        \
 367                        NETIF_F_GSO_SOFTWARE |   \
 368                        NETIF_F_HW_CSUM)
 369
 370 static void ipip_tunnel_setup(struct net_device *dev)
 371 {
 372         dev->netdev_ops         = &ipip_netdev_ops;
 373
 374         dev->type               = ARPHRD_TUNNEL;
 375         dev->flags              = IFF_NOARP;
 376         dev->addr_len           = 4;
 377         dev->features           |= NETIF_F_LLTX;
 378         netif_keep_dst(dev);
 379
 380         dev->features           |= IPIP_FEATURES;
 381         dev->hw_features        |= IPIP_FEATURES;
 382         ip_tunnel_setup(dev, ipip_net_id);
 383 }
 384
 385 static int ipip_tunnel_init(struct net_device *dev)
 386 {
 387         struct ip_tunnel *tunnel = netdev_priv(dev);
 388
 389         memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 390         memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 391
 392         tunnel->tun_hlen = 0;
 393         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
 394         return ip_tunnel_init(dev);
 395 }
 396
 397 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
 398                                 struct netlink_ext_ack *extack)
 399 {
 400         u8 proto;
 401
 402         if (!data || !data[IFLA_IPTUN_PROTO])
 403                 return 0;
 404
 405         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 406         if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
 407                 return -EINVAL;
 408
 409         return 0;
 410 }
 411
 412 static void ipip_netlink_parms(struct nlattr *data[],
 413                                struct ip_tunnel_parm *parms, bool *collect_md,
 414                                __u32 *fwmark)
 415 {
 416         memset(parms, 0, sizeof(*parms));
 417
 418         parms->iph.version = 4;
 419         parms->iph.protocol = IPPROTO_IPIP;
 420         parms->iph.ihl = 5;
 421         *collect_md = false;
 422
 423         if (!data)
 424                 return;
 425
 426         if (data[IFLA_IPTUN_LINK])
 427                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
 428
 429         if (data[IFLA_IPTUN_LOCAL])
 430                 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
 431
 432         if (data[IFLA_IPTUN_REMOTE])
 433                 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
 434
 435         if (data[IFLA_IPTUN_TTL]) {
 436                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
 437                 if (parms->iph.ttl)
 438                         parms->iph.frag_off = htons(IP_DF);
 439         }
 440
 441         if (data[IFLA_IPTUN_TOS])
 442                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
 443
 444         if (data[IFLA_IPTUN_PROTO])
 445                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 446
 447         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
 448                 parms->iph.frag_off = htons(IP_DF);
 449
 450         if (data[IFLA_IPTUN_COLLECT_METADATA])
 451                 *collect_md = true;
 452
 453         if (data[IFLA_IPTUN_FWMARK])
 454                 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 455 }
 456
 457 /* This function returns true when ENCAP attributes are present in the nl msg */
 458 static bool ipip_netlink_encap_parms(struct nlattr *data[],
 459                                      struct ip_tunnel_encap *ipencap)
 460 {
 461         bool ret = false;
 462
 463         memset(ipencap, 0, sizeof(*ipencap));
 464
 465         if (!data)
 466                 return ret;
 467
 468         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
 469                 ret = true;
 470                 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
 471         }
 472
 473         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
 474                 ret = true;
 475                 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
 476         }
 477
 478         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
 479                 ret = true;
 480                 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
 481         }
 482
 483         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
 484                 ret = true;
 485                 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
 486         }
 487
 488         return ret;
 489 }
 490
 491 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 492                         struct nlattr *tb[], struct nlattr *data[],
 493                         struct netlink_ext_ack *extack)
 494 {
 495         struct ip_tunnel *t = netdev_priv(dev);
 496         struct ip_tunnel_parm p;
 497         struct ip_tunnel_encap ipencap;
 498         __u32 fwmark = 0;
 499
 500         if (ipip_netlink_encap_parms(data, &ipencap)) {
 501                 int err = ip_tunnel_encap_setup(t, &ipencap);
 502
 503                 if (err < 0)
 504                         return err;
 505         }
 506
 507         ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
 508         return ip_tunnel_newlink(dev, tb, &p, fwmark);
 509 }
 510
 511 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 512                            struct nlattr *data[],
 513                            struct netlink_ext_ack *extack)
 514 {
 515         struct ip_tunnel *t = netdev_priv(dev);
 516         struct ip_tunnel_parm p;
 517         struct ip_tunnel_encap ipencap;
 518         bool collect_md;
 519         __u32 fwmark = t->fwmark;
 520
 521         if (ipip_netlink_encap_parms(data, &ipencap)) {
 522                 int err = ip_tunnel_encap_setup(t, &ipencap);
 523
 524                 if (err < 0)
 525                         return err;
 526         }
 527
 528         ipip_netlink_parms(data, &p, &collect_md, &fwmark);
 529         if (collect_md)
 530                 return -EINVAL;
 531
 532         if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
 533             (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
 534                 return -EINVAL;
 535
 536         return ip_tunnel_changelink(dev, tb, &p, fwmark);
 537 }
 538
 539 static size_t ipip_get_size(const struct net_device *dev)
 540 {
 541         return
 542                 /* IFLA_IPTUN_LINK */
 543                 nla_total_size(4) +
 544                 /* IFLA_IPTUN_LOCAL */
 545                 nla_total_size(4) +
 546                 /* IFLA_IPTUN_REMOTE */
 547                 nla_total_size(4) +
 548                 /* IFLA_IPTUN_TTL */
 549                 nla_total_size(1) +
 550                 /* IFLA_IPTUN_TOS */
 551                 nla_total_size(1) +
 552                 /* IFLA_IPTUN_PROTO */
 553                 nla_total_size(1) +
 554                 /* IFLA_IPTUN_PMTUDISC */
 555                 nla_total_size(1) +
 556                 /* IFLA_IPTUN_ENCAP_TYPE */
 557                 nla_total_size(2) +
 558                 /* IFLA_IPTUN_ENCAP_FLAGS */
 559                 nla_total_size(2) +
 560                 /* IFLA_IPTUN_ENCAP_SPORT */
 561                 nla_total_size(2) +
 562                 /* IFLA_IPTUN_ENCAP_DPORT */
 563                 nla_total_size(2) +
 564                 /* IFLA_IPTUN_COLLECT_METADATA */
 565                 nla_total_size(0) +
 566                 /* IFLA_IPTUN_FWMARK */
 567                 nla_total_size(4) +
 568                 0;
 569 }
 570
 571 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
 572 {
 573         struct ip_tunnel *tunnel = netdev_priv(dev);
 574         struct ip_tunnel_parm *parm = &tunnel->parms;
 575
 576         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
 577             nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
 578             nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
 579             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
 580             nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
 581             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
 582             nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
 583                        !!(parm->iph.frag_off & htons(IP_DF))) ||
 584             nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
 585                 goto nla_put_failure;
 586
 587         if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
 588                         tunnel->encap.type) ||
 589             nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
 590                          tunnel->encap.sport) ||
 591             nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
 592                          tunnel->encap.dport) ||
 593             nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
 594                         tunnel->encap.flags))
 595                 goto nla_put_failure;
 596
 597         if (tunnel->collect_md)
 598                 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
 599                         goto nla_put_failure;
 600         return 0;
 601
 602 nla_put_failure:
 603         return -EMSGSIZE;
 604 }
 605
 606 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
 607         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
 608         [IFLA_IPTUN_LOCAL]              = { .type = NLA_U32 },
 609         [IFLA_IPTUN_REMOTE]             = { .type = NLA_U32 },
 610         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
 611         [IFLA_IPTUN_TOS]                = { .type = NLA_U8 },
 612         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
 613         [IFLA_IPTUN_PMTUDISC]           = { .type = NLA_U8 },
 614         [IFLA_IPTUN_ENCAP_TYPE]         = { .type = NLA_U16 },
 615         [IFLA_IPTUN_ENCAP_FLAGS]        = { .type = NLA_U16 },
 616         [IFLA_IPTUN_ENCAP_SPORT]        = { .type = NLA_U16 },
 617         [IFLA_IPTUN_ENCAP_DPORT]        = { .type = NLA_U16 },
 618         [IFLA_IPTUN_COLLECT_METADATA]   = { .type = NLA_FLAG },
 619         [IFLA_IPTUN_FWMARK]             = { .type = NLA_U32 },
 620 };
 621
 622 static struct rtnl_link_ops ipip_link_ops __read_mostly = {
 623         .kind           = "ipip",
 624         .maxtype        = IFLA_IPTUN_MAX,
 625         .policy         = ipip_policy,
 626         .priv_size      = sizeof(struct ip_tunnel),
 627         .setup          = ipip_tunnel_setup,
 628         .validate       = ipip_tunnel_validate,
 629         .newlink        = ipip_newlink,
 630         .changelink     = ipip_changelink,
 631         .dellink        = ip_tunnel_dellink,
 632         .get_size       = ipip_get_size,
 633         .fill_info      = ipip_fill_info,
 634         .get_link_net   = ip_tunnel_get_link_net,
 635 };
 636
 637 static struct xfrm_tunnel ipip_handler __read_mostly = {
 638         .handler        =       ipip_rcv,
 639         .err_handler    =       ipip_err,
 640         .priority       =       1,
 641 };
 642
 643 #if IS_ENABLED(CONFIG_MPLS)
 644 static struct xfrm_tunnel mplsip_handler __read_mostly = {
 645         .handler        =       mplsip_rcv,
 646         .err_handler    =       ipip_err,
 647         .priority       =       1,
 648 };
 649 #endif
 650
 651 static int __net_init ipip_init_net(struct net *net)
 652 {
 653         return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 654 }
 655
 656 static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
 657 {
 658         ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
 659 }
 660
 661 static struct pernet_operations ipip_net_ops = {
 662         .init = ipip_init_net,
 663         .exit_batch = ipip_exit_batch_net,
 664         .id   = &ipip_net_id,
 665         .size = sizeof(struct ip_tunnel_net),
 666 };
 667
 668 static int __init ipip_init(void)
 669 {
 670         int err;
 671
 672         pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
 673
 674         err = register_pernet_device(&ipip_net_ops);
 675         if (err < 0)
 676                 return err;
 677         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
 678         if (err < 0) {
 679                 pr_info("%s: can't register tunnel\n", __func__);
 680                 goto xfrm_tunnel_ipip_failed;
 681         }
 682 #if IS_ENABLED(CONFIG_MPLS)
 683         err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
 684         if (err < 0) {
 685                 pr_info("%s: can't register tunnel\n", __func__);
 686                 goto xfrm_tunnel_mplsip_failed;
 687         }
 688 #endif
 689         err = rtnl_link_register(&ipip_link_ops);
 690         if (err < 0)
 691                 goto rtnl_link_failed;
 692
 693 out:
 694         return err;
 695
 696 rtnl_link_failed:
 697 #if IS_ENABLED(CONFIG_MPLS)
 698         xfrm4_tunnel_deregister(&mplsip_handler, AF_INET);
 699 xfrm_tunnel_mplsip_failed:
 700
 701 #endif
 702         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
 703 xfrm_tunnel_ipip_failed:
 704         unregister_pernet_device(&ipip_net_ops);
 705         goto out;
 706 }
 707
 708 static void __exit ipip_fini(void)
 709 {
 710         rtnl_link_unregister(&ipip_link_ops);
 711         if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
 712                 pr_info("%s: can't deregister tunnel\n", __func__);
 713 #if IS_ENABLED(CONFIG_MPLS)
 714         if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
 715                 pr_info("%s: can't deregister tunnel\n", __func__);
 716 #endif
 717         unregister_pernet_device(&ipip_net_ops);
 718 }
 719
 720 module_init(ipip_init);
 721 module_exit(ipip_fini);
 722 MODULE_LICENSE("GPL");
 723 MODULE_ALIAS_RTNL_LINK("ipip");
 724 MODULE_ALIAS_NETDEV("tunl0");