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         dev->header_ops         = &ip_tunnel_header_ops;
 365
 366         dev->type               = ARPHRD_TUNNEL;
 367         dev->flags              = IFF_NOARP;
 368         dev->addr_len           = 4;
 369         dev->features           |= NETIF_F_LLTX;
 370         netif_keep_dst(dev);
 371
 372         dev->features           |= IPIP_FEATURES;
 373         dev->hw_features        |= IPIP_FEATURES;
 374         ip_tunnel_setup(dev, ipip_net_id);
 375 }
 376
 377 static int ipip_tunnel_init(struct net_device *dev)
 378 {
 379         struct ip_tunnel *tunnel = netdev_priv(dev);
 380
 381         memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 382         memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 383
 384         tunnel->tun_hlen = 0;
 385         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
 386         return ip_tunnel_init(dev);
 387 }
 388
 389 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
 390                                 struct netlink_ext_ack *extack)
 391 {
 392         u8 proto;
 393
 394         if (!data || !data[IFLA_IPTUN_PROTO])
 395                 return 0;
 396
 397         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 398         if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
 399                 return -EINVAL;
 400
 401         return 0;
 402 }
 403
 404 static void ipip_netlink_parms(struct nlattr *data[],
 405                                struct ip_tunnel_parm *parms, bool *collect_md,
 406                                __u32 *fwmark)
 407 {
 408         memset(parms, 0, sizeof(*parms));
 409
 410         parms->iph.version = 4;
 411         parms->iph.protocol = IPPROTO_IPIP;
 412         parms->iph.ihl = 5;
 413         *collect_md = false;
 414
 415         if (!data)
 416                 return;
 417
 418         if (data[IFLA_IPTUN_LINK])
 419                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
 420
 421         if (data[IFLA_IPTUN_LOCAL])
 422                 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
 423
 424         if (data[IFLA_IPTUN_REMOTE])
 425                 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
 426
 427         if (data[IFLA_IPTUN_TTL]) {
 428                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
 429                 if (parms->iph.ttl)
 430                         parms->iph.frag_off = htons(IP_DF);
 431         }
 432
 433         if (data[IFLA_IPTUN_TOS])
 434                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
 435
 436         if (data[IFLA_IPTUN_PROTO])
 437                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 438
 439         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
 440                 parms->iph.frag_off = htons(IP_DF);
 441
 442         if (data[IFLA_IPTUN_COLLECT_METADATA])
 443                 *collect_md = true;
 444
 445         if (data[IFLA_IPTUN_FWMARK])
 446                 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 447 }
 448
 449 /* This function returns true when ENCAP attributes are present in the nl msg */
 450 static bool ipip_netlink_encap_parms(struct nlattr *data[],
 451                                      struct ip_tunnel_encap *ipencap)
 452 {
 453         bool ret = false;
 454
 455         memset(ipencap, 0, sizeof(*ipencap));
 456
 457         if (!data)
 458                 return ret;
 459
 460         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
 461                 ret = true;
 462                 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
 463         }
 464
 465         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
 466                 ret = true;
 467                 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
 468         }
 469
 470         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
 471                 ret = true;
 472                 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
 473         }
 474
 475         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
 476                 ret = true;
 477                 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
 478         }
 479
 480         return ret;
 481 }
 482
 483 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 484                         struct nlattr *tb[], struct nlattr *data[],
 485                         struct netlink_ext_ack *extack)
 486 {
 487         struct ip_tunnel *t = netdev_priv(dev);
 488         struct ip_tunnel_parm p;
 489         struct ip_tunnel_encap ipencap;
 490         __u32 fwmark = 0;
 491
 492         if (ipip_netlink_encap_parms(data, &ipencap)) {
 493                 int err = ip_tunnel_encap_setup(t, &ipencap);
 494
 495                 if (err < 0)
 496                         return err;
 497         }
 498
 499         ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
 500         return ip_tunnel_newlink(dev, tb, &p, fwmark);
 501 }
 502
 503 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 504                            struct nlattr *data[],
 505                            struct netlink_ext_ack *extack)
 506 {
 507         struct ip_tunnel *t = netdev_priv(dev);
 508         struct ip_tunnel_parm p;
 509         struct ip_tunnel_encap ipencap;
 510         bool collect_md;
 511         __u32 fwmark = t->fwmark;
 512
 513         if (ipip_netlink_encap_parms(data, &ipencap)) {
 514                 int err = ip_tunnel_encap_setup(t, &ipencap);
 515
 516                 if (err < 0)
 517                         return err;
 518         }
 519
 520         ipip_netlink_parms(data, &p, &collect_md, &fwmark);
 521         if (collect_md)
 522                 return -EINVAL;
 523
 524         if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
 525             (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
 526                 return -EINVAL;
 527
 528         return ip_tunnel_changelink(dev, tb, &p, fwmark);
 529 }
 530
 531 static size_t ipip_get_size(const struct net_device *dev)
 532 {
 533         return
 534                 /* IFLA_IPTUN_LINK */
 535                 nla_total_size(4) +
 536                 /* IFLA_IPTUN_LOCAL */
 537                 nla_total_size(4) +
 538                 /* IFLA_IPTUN_REMOTE */
 539                 nla_total_size(4) +
 540                 /* IFLA_IPTUN_TTL */
 541                 nla_total_size(1) +
 542                 /* IFLA_IPTUN_TOS */
 543                 nla_total_size(1) +
 544                 /* IFLA_IPTUN_PROTO */
 545                 nla_total_size(1) +
 546                 /* IFLA_IPTUN_PMTUDISC */
 547                 nla_total_size(1) +
 548                 /* IFLA_IPTUN_ENCAP_TYPE */
 549                 nla_total_size(2) +
 550                 /* IFLA_IPTUN_ENCAP_FLAGS */
 551                 nla_total_size(2) +
 552                 /* IFLA_IPTUN_ENCAP_SPORT */
 553                 nla_total_size(2) +
 554                 /* IFLA_IPTUN_ENCAP_DPORT */
 555                 nla_total_size(2) +
 556                 /* IFLA_IPTUN_COLLECT_METADATA */
 557                 nla_total_size(0) +
 558                 /* IFLA_IPTUN_FWMARK */
 559                 nla_total_size(4) +
 560                 0;
 561 }
 562
 563 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
 564 {
 565         struct ip_tunnel *tunnel = netdev_priv(dev);
 566         struct ip_tunnel_parm *parm = &tunnel->parms;
 567
 568         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
 569             nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
 570             nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
 571             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
 572             nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
 573             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
 574             nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
 575                        !!(parm->iph.frag_off & htons(IP_DF))) ||
 576             nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
 577                 goto nla_put_failure;
 578
 579         if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
 580                         tunnel->encap.type) ||
 581             nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
 582                          tunnel->encap.sport) ||
 583             nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
 584                          tunnel->encap.dport) ||
 585             nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
 586                         tunnel->encap.flags))
 587                 goto nla_put_failure;
 588
 589         if (tunnel->collect_md)
 590                 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
 591                         goto nla_put_failure;
 592         return 0;
 593
 594 nla_put_failure:
 595         return -EMSGSIZE;
 596 }
 597
 598 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
 599         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
 600         [IFLA_IPTUN_LOCAL]              = { .type = NLA_U32 },
 601         [IFLA_IPTUN_REMOTE]             = { .type = NLA_U32 },
 602         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
 603         [IFLA_IPTUN_TOS]                = { .type = NLA_U8 },
 604         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
 605         [IFLA_IPTUN_PMTUDISC]           = { .type = NLA_U8 },
 606         [IFLA_IPTUN_ENCAP_TYPE]         = { .type = NLA_U16 },
 607         [IFLA_IPTUN_ENCAP_FLAGS]        = { .type = NLA_U16 },
 608         [IFLA_IPTUN_ENCAP_SPORT]        = { .type = NLA_U16 },
 609         [IFLA_IPTUN_ENCAP_DPORT]        = { .type = NLA_U16 },
 610         [IFLA_IPTUN_COLLECT_METADATA]   = { .type = NLA_FLAG },
 611         [IFLA_IPTUN_FWMARK]             = { .type = NLA_U32 },
 612 };
 613
 614 static struct rtnl_link_ops ipip_link_ops __read_mostly = {
 615         .kind           = "ipip",
 616         .maxtype        = IFLA_IPTUN_MAX,
 617         .policy         = ipip_policy,
 618         .priv_size      = sizeof(struct ip_tunnel),
 619         .setup          = ipip_tunnel_setup,
 620         .validate       = ipip_tunnel_validate,
 621         .newlink        = ipip_newlink,
 622         .changelink     = ipip_changelink,
 623         .dellink        = ip_tunnel_dellink,
 624         .get_size       = ipip_get_size,
 625         .fill_info      = ipip_fill_info,
 626         .get_link_net   = ip_tunnel_get_link_net,
 627 };
 628
 629 static struct xfrm_tunnel ipip_handler __read_mostly = {
 630         .handler        =       ipip_rcv,
 631         .err_handler    =       ipip_err,
 632         .priority       =       1,
 633 };
 634
 635 #if IS_ENABLED(CONFIG_MPLS)
 636 static struct xfrm_tunnel mplsip_handler __read_mostly = {
 637         .handler        =       mplsip_rcv,
 638         .err_handler    =       ipip_err,
 639         .priority       =       1,
 640 };
 641 #endif
 642
 643 static int __net_init ipip_init_net(struct net *net)
 644 {
 645         return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 646 }
 647
 648 static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
 649 {
 650         ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
 651 }
 652
 653 static struct pernet_operations ipip_net_ops = {
 654         .init = ipip_init_net,
 655         .exit_batch = ipip_exit_batch_net,
 656         .id   = &ipip_net_id,
 657         .size = sizeof(struct ip_tunnel_net),
 658 };
 659
 660 static int __init ipip_init(void)
 661 {
 662         int err;
 663
 664         pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
 665
 666         err = register_pernet_device(&ipip_net_ops);
 667         if (err < 0)
 668                 return err;
 669         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
 670         if (err < 0) {
 671                 pr_info("%s: can't register tunnel\n", __func__);
 672                 goto xfrm_tunnel_ipip_failed;
 673         }
 674 #if IS_ENABLED(CONFIG_MPLS)
 675         err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
 676         if (err < 0) {
 677                 pr_info("%s: can't register tunnel\n", __func__);
 678                 goto xfrm_tunnel_mplsip_failed;
 679         }
 680 #endif
 681         err = rtnl_link_register(&ipip_link_ops);
 682         if (err < 0)
 683                 goto rtnl_link_failed;
 684
 685 out:
 686         return err;
 687
 688 rtnl_link_failed:
 689 #if IS_ENABLED(CONFIG_MPLS)
 690         xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
 691 xfrm_tunnel_mplsip_failed:
 692
 693 #endif
 694         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
 695 xfrm_tunnel_ipip_failed:
 696         unregister_pernet_device(&ipip_net_ops);
 697         goto out;
 698 }
 699
 700 static void __exit ipip_fini(void)
 701 {
 702         rtnl_link_unregister(&ipip_link_ops);
 703         if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
 704                 pr_info("%s: can't deregister tunnel\n", __func__);
 705 #if IS_ENABLED(CONFIG_MPLS)
 706         if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
 707                 pr_info("%s: can't deregister tunnel\n", __func__);
 708 #endif
 709         unregister_pernet_device(&ipip_net_ops);
 710 }
 711
 712 module_init(ipip_init);
 713 module_exit(ipip_fini);
 714 MODULE_LICENSE("GPL");
 715 MODULE_ALIAS_RTNL_LINK("ipip");
 716 MODULE_ALIAS_NETDEV("tunl0");