net/xfrm/xfrm_interface.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      XFRM virtual interface
   4  *
   5  *      Copyright (C) 2018 secunet Security Networks AG
   6  *
   7  *      Author:
   8  *      Steffen Klassert <steffen.klassert@secunet.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/capability.h>
  13 #include <linux/errno.h>
  14 #include <linux/types.h>
  15 #include <linux/sockios.h>
  16 #include <linux/icmp.h>
  17 #include <linux/if.h>
  18 #include <linux/in.h>
  19 #include <linux/ip.h>
  20 #include <linux/net.h>
  21 #include <linux/in6.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/if_link.h>
  24 #include <linux/if_arp.h>
  25 #include <linux/icmpv6.h>
  26 #include <linux/init.h>
  27 #include <linux/route.h>
  28 #include <linux/rtnetlink.h>
  29 #include <linux/netfilter_ipv6.h>
  30 #include <linux/slab.h>
  31 #include <linux/hash.h>
  32
  33 #include <linux/uaccess.h>
  34 #include <linux/atomic.h>
  35
  36 #include <net/icmp.h>
  37 #include <net/ip.h>
  38 #include <net/ipv6.h>
  39 #include <net/ip6_route.h>
  40 #include <net/addrconf.h>
  41 #include <net/xfrm.h>
  42 #include <net/net_namespace.h>
  43 #include <net/netns/generic.h>
  44 #include <linux/etherdevice.h>
  45
  46 static int xfrmi_dev_init(struct net_device *dev);
  47 static void xfrmi_dev_setup(struct net_device *dev);
  48 static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
  49 static unsigned int xfrmi_net_id __read_mostly;
  50
  51 struct xfrmi_net {
  52         /* lists for storing interfaces in use */
  53         struct xfrm_if __rcu *xfrmi[1];
  54 };
  55
  56 #define for_each_xfrmi_rcu(start, xi) \
  57         for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
  58
  59 static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
  60 {
  61         struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
  62         struct xfrm_if *xi;
  63
  64         for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
  65                 if (x->if_id == xi->p.if_id &&
  66                     (xi->dev->flags & IFF_UP))
  67                         return xi;
  68         }
  69
  70         return NULL;
  71 }
  72
  73 static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb,
  74                                             unsigned short family)
  75 {
  76         struct xfrmi_net *xfrmn;
  77         struct xfrm_if *xi;
  78         int ifindex = 0;
  79
  80         if (!secpath_exists(skb) || !skb->dev)
  81                 return NULL;
  82
  83         switch (family) {
  84         case AF_INET6:
  85                 ifindex = inet6_sdif(skb);
  86                 break;
  87         case AF_INET:
  88                 ifindex = inet_sdif(skb);
  89                 break;
  90         }
  91         if (!ifindex)
  92                 ifindex = skb->dev->ifindex;
  93
  94         xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id);
  95
  96         for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
  97                 if (ifindex == xi->dev->ifindex &&
  98                         (xi->dev->flags & IFF_UP))
  99                                 return xi;
 100         }
 101
 102         return NULL;
 103 }
 104
 105 static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
 106 {
 107         struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
 108
 109         rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
 110         rcu_assign_pointer(*xip, xi);
 111 }
 112
 113 static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
 114 {
 115         struct xfrm_if __rcu **xip;
 116         struct xfrm_if *iter;
 117
 118         for (xip = &xfrmn->xfrmi[0];
 119              (iter = rtnl_dereference(*xip)) != NULL;
 120              xip = &iter->next) {
 121                 if (xi == iter) {
 122                         rcu_assign_pointer(*xip, xi->next);
 123                         break;
 124                 }
 125         }
 126 }
 127
 128 static void xfrmi_dev_free(struct net_device *dev)
 129 {
 130         struct xfrm_if *xi = netdev_priv(dev);
 131
 132         gro_cells_destroy(&xi->gro_cells);
 133         free_percpu(dev->tstats);
 134 }
 135
 136 static int xfrmi_create(struct net_device *dev)
 137 {
 138         struct xfrm_if *xi = netdev_priv(dev);
 139         struct net *net = dev_net(dev);
 140         struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
 141         int err;
 142
 143         dev->rtnl_link_ops = &xfrmi_link_ops;
 144         err = register_netdevice(dev);
 145         if (err < 0)
 146                 goto out;
 147
 148         dev_hold(dev);
 149         xfrmi_link(xfrmn, xi);
 150
 151         return 0;
 152
 153 out:
 154         return err;
 155 }
 156
 157 static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
 158 {
 159         struct xfrm_if __rcu **xip;
 160         struct xfrm_if *xi;
 161         struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
 162
 163         for (xip = &xfrmn->xfrmi[0];
 164              (xi = rtnl_dereference(*xip)) != NULL;
 165              xip = &xi->next)
 166                 if (xi->p.if_id == p->if_id)
 167                         return xi;
 168
 169         return NULL;
 170 }
 171
 172 static void xfrmi_dev_uninit(struct net_device *dev)
 173 {
 174         struct xfrm_if *xi = netdev_priv(dev);
 175         struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
 176
 177         xfrmi_unlink(xfrmn, xi);
 178         dev_put(dev);
 179 }
 180
 181 static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
 182 {
 183         skb->tstamp = 0;
 184         skb->pkt_type = PACKET_HOST;
 185         skb->skb_iif = 0;
 186         skb->ignore_df = 0;
 187         skb_dst_drop(skb);
 188         nf_reset_ct(skb);
 189         nf_reset_trace(skb);
 190
 191         if (!xnet)
 192                 return;
 193
 194         ipvs_reset(skb);
 195         secpath_reset(skb);
 196         skb_orphan(skb);
 197         skb->mark = 0;
 198 }
 199
 200 static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
 201 {
 202         const struct xfrm_mode *inner_mode;
 203         struct pcpu_sw_netstats *tstats;
 204         struct net_device *dev;
 205         struct xfrm_state *x;
 206         struct xfrm_if *xi;
 207         bool xnet;
 208
 209         if (err && !secpath_exists(skb))
 210                 return 0;
 211
 212         x = xfrm_input_state(skb);
 213
 214         xi = xfrmi_lookup(xs_net(x), x);
 215         if (!xi)
 216                 return 1;
 217
 218         dev = xi->dev;
 219         skb->dev = dev;
 220
 221         if (err) {
 222                 dev->stats.rx_errors++;
 223                 dev->stats.rx_dropped++;
 224
 225                 return 0;
 226         }
 227
 228         xnet = !net_eq(xi->net, dev_net(skb->dev));
 229
 230         if (xnet) {
 231                 inner_mode = &x->inner_mode;
 232
 233                 if (x->sel.family == AF_UNSPEC) {
 234                         inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
 235                         if (inner_mode == NULL) {
 236                                 XFRM_INC_STATS(dev_net(skb->dev),
 237                                                LINUX_MIB_XFRMINSTATEMODEERROR);
 238                                 return -EINVAL;
 239                         }
 240                 }
 241
 242                 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
 243                                        inner_mode->family))
 244                         return -EPERM;
 245         }
 246
 247         xfrmi_scrub_packet(skb, xnet);
 248
 249         tstats = this_cpu_ptr(dev->tstats);
 250
 251         u64_stats_update_begin(&tstats->syncp);
 252         tstats->rx_packets++;
 253         tstats->rx_bytes += skb->len;
 254         u64_stats_update_end(&tstats->syncp);
 255
 256         return 0;
 257 }
 258
 259 static int
 260 xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
 261 {
 262         struct xfrm_if *xi = netdev_priv(dev);
 263         struct net_device_stats *stats = &xi->dev->stats;
 264         struct dst_entry *dst = skb_dst(skb);
 265         unsigned int length = skb->len;
 266         struct net_device *tdev;
 267         struct xfrm_state *x;
 268         int err = -1;
 269         int mtu;
 270
 271         if (!dst)
 272                 goto tx_err_link_failure;
 273
 274         dst_hold(dst);
 275         dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
 276         if (IS_ERR(dst)) {
 277                 err = PTR_ERR(dst);
 278                 dst = NULL;
 279                 goto tx_err_link_failure;
 280         }
 281
 282         x = dst->xfrm;
 283         if (!x)
 284                 goto tx_err_link_failure;
 285
 286         if (x->if_id != xi->p.if_id)
 287                 goto tx_err_link_failure;
 288
 289         tdev = dst->dev;
 290
 291         if (tdev == dev) {
 292                 stats->collisions++;
 293                 net_warn_ratelimited("%s: Local routing loop detected!\n",
 294                                      dev->name);
 295                 goto tx_err_dst_release;
 296         }
 297
 298         mtu = dst_mtu(dst);
 299         if (!skb->ignore_df && skb->len > mtu) {
 300                 skb_dst_update_pmtu(skb, mtu);
 301
 302                 if (skb->protocol == htons(ETH_P_IPV6)) {
 303                         if (mtu < IPV6_MIN_MTU)
 304                                 mtu = IPV6_MIN_MTU;
 305
 306                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 307                 } else {
 308                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 309                                   htonl(mtu));
 310                 }
 311
 312                 dst_release(dst);
 313                 return -EMSGSIZE;
 314         }
 315
 316         xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
 317         skb_dst_set(skb, dst);
 318         skb->dev = tdev;
 319
 320         err = dst_output(xi->net, skb->sk, skb);
 321         if (net_xmit_eval(err) == 0) {
 322                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 323
 324                 u64_stats_update_begin(&tstats->syncp);
 325                 tstats->tx_bytes += length;
 326                 tstats->tx_packets++;
 327                 u64_stats_update_end(&tstats->syncp);
 328         } else {
 329                 stats->tx_errors++;
 330                 stats->tx_aborted_errors++;
 331         }
 332
 333         return 0;
 334 tx_err_link_failure:
 335         stats->tx_carrier_errors++;
 336         dst_link_failure(skb);
 337 tx_err_dst_release:
 338         dst_release(dst);
 339         return err;
 340 }
 341
 342 static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
 343 {
 344         struct xfrm_if *xi = netdev_priv(dev);
 345         struct net_device_stats *stats = &xi->dev->stats;
 346         struct flowi fl;
 347         int ret;
 348
 349         memset(&fl, 0, sizeof(fl));
 350
 351         switch (skb->protocol) {
 352         case htons(ETH_P_IPV6):
 353                 xfrm_decode_session(skb, &fl, AF_INET6);
 354                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
 355                 break;
 356         case htons(ETH_P_IP):
 357                 xfrm_decode_session(skb, &fl, AF_INET);
 358                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 359                 break;
 360         default:
 361                 goto tx_err;
 362         }
 363
 364         fl.flowi_oif = xi->p.link;
 365
 366         ret = xfrmi_xmit2(skb, dev, &fl);
 367         if (ret < 0)
 368                 goto tx_err;
 369
 370         return NETDEV_TX_OK;
 371
 372 tx_err:
 373         stats->tx_errors++;
 374         stats->tx_dropped++;
 375         kfree_skb(skb);
 376         return NETDEV_TX_OK;
 377 }
 378
 379 static int xfrmi4_err(struct sk_buff *skb, u32 info)
 380 {
 381         const struct iphdr *iph = (const struct iphdr *)skb->data;
 382         struct net *net = dev_net(skb->dev);
 383         int protocol = iph->protocol;
 384         struct ip_comp_hdr *ipch;
 385         struct ip_esp_hdr *esph;
 386         struct ip_auth_hdr *ah ;
 387         struct xfrm_state *x;
 388         struct xfrm_if *xi;
 389         __be32 spi;
 390
 391         switch (protocol) {
 392         case IPPROTO_ESP:
 393                 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
 394                 spi = esph->spi;
 395                 break;
 396         case IPPROTO_AH:
 397                 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
 398                 spi = ah->spi;
 399                 break;
 400         case IPPROTO_COMP:
 401                 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
 402                 spi = htonl(ntohs(ipch->cpi));
 403                 break;
 404         default:
 405                 return 0;
 406         }
 407
 408         switch (icmp_hdr(skb)->type) {
 409         case ICMP_DEST_UNREACH:
 410                 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
 411                         return 0;
 412         case ICMP_REDIRECT:
 413                 break;
 414         default:
 415                 return 0;
 416         }
 417
 418         x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
 419                               spi, protocol, AF_INET);
 420         if (!x)
 421                 return 0;
 422
 423         xi = xfrmi_lookup(net, x);
 424         if (!xi) {
 425                 xfrm_state_put(x);
 426                 return -1;
 427         }
 428
 429         if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
 430                 ipv4_update_pmtu(skb, net, info, 0, protocol);
 431         else
 432                 ipv4_redirect(skb, net, 0, protocol);
 433         xfrm_state_put(x);
 434
 435         return 0;
 436 }
 437
 438 static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 439                     u8 type, u8 code, int offset, __be32 info)
 440 {
 441         const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
 442         struct net *net = dev_net(skb->dev);
 443         int protocol = iph->nexthdr;
 444         struct ip_comp_hdr *ipch;
 445         struct ip_esp_hdr *esph;
 446         struct ip_auth_hdr *ah;
 447         struct xfrm_state *x;
 448         struct xfrm_if *xi;
 449         __be32 spi;
 450
 451         switch (protocol) {
 452         case IPPROTO_ESP:
 453                 esph = (struct ip_esp_hdr *)(skb->data + offset);
 454                 spi = esph->spi;
 455                 break;
 456         case IPPROTO_AH:
 457                 ah = (struct ip_auth_hdr *)(skb->data + offset);
 458                 spi = ah->spi;
 459                 break;
 460         case IPPROTO_COMP:
 461                 ipch = (struct ip_comp_hdr *)(skb->data + offset);
 462                 spi = htonl(ntohs(ipch->cpi));
 463                 break;
 464         default:
 465                 return 0;
 466         }
 467
 468         if (type != ICMPV6_PKT_TOOBIG &&
 469             type != NDISC_REDIRECT)
 470                 return 0;
 471
 472         x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
 473                               spi, protocol, AF_INET6);
 474         if (!x)
 475                 return 0;
 476
 477         xi = xfrmi_lookup(net, x);
 478         if (!xi) {
 479                 xfrm_state_put(x);
 480                 return -1;
 481         }
 482
 483         if (type == NDISC_REDIRECT)
 484                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 485                              sock_net_uid(net, NULL));
 486         else
 487                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 488         xfrm_state_put(x);
 489
 490         return 0;
 491 }
 492
 493 static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
 494 {
 495         if (xi->p.link != p->link)
 496                 return -EINVAL;
 497
 498         xi->p.if_id = p->if_id;
 499
 500         return 0;
 501 }
 502
 503 static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
 504 {
 505         struct net *net = xi->net;
 506         struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
 507         int err;
 508
 509         xfrmi_unlink(xfrmn, xi);
 510         synchronize_net();
 511         err = xfrmi_change(xi, p);
 512         xfrmi_link(xfrmn, xi);
 513         netdev_state_change(xi->dev);
 514         return err;
 515 }
 516
 517 static void xfrmi_get_stats64(struct net_device *dev,
 518                                struct rtnl_link_stats64 *s)
 519 {
 520         int cpu;
 521
 522         for_each_possible_cpu(cpu) {
 523                 struct pcpu_sw_netstats *stats;
 524                 struct pcpu_sw_netstats tmp;
 525                 int start;
 526
 527                 stats = per_cpu_ptr(dev->tstats, cpu);
 528                 do {
 529                         start = u64_stats_fetch_begin_irq(&stats->syncp);
 530                         tmp.rx_packets = stats->rx_packets;
 531                         tmp.rx_bytes   = stats->rx_bytes;
 532                         tmp.tx_packets = stats->tx_packets;
 533                         tmp.tx_bytes   = stats->tx_bytes;
 534                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
 535
 536                 s->rx_packets += tmp.rx_packets;
 537                 s->rx_bytes   += tmp.rx_bytes;
 538                 s->tx_packets += tmp.tx_packets;
 539                 s->tx_bytes   += tmp.tx_bytes;
 540         }
 541
 542         s->rx_dropped = dev->stats.rx_dropped;
 543         s->tx_dropped = dev->stats.tx_dropped;
 544 }
 545
 546 static int xfrmi_get_iflink(const struct net_device *dev)
 547 {
 548         struct xfrm_if *xi = netdev_priv(dev);
 549
 550         return xi->p.link;
 551 }
 552
 553
 554 static const struct net_device_ops xfrmi_netdev_ops = {
 555         .ndo_init       = xfrmi_dev_init,
 556         .ndo_uninit     = xfrmi_dev_uninit,
 557         .ndo_start_xmit = xfrmi_xmit,
 558         .ndo_get_stats64 = xfrmi_get_stats64,
 559         .ndo_get_iflink = xfrmi_get_iflink,
 560 };
 561
 562 static void xfrmi_dev_setup(struct net_device *dev)
 563 {
 564         dev->netdev_ops         = &xfrmi_netdev_ops;
 565         dev->type               = ARPHRD_NONE;
 566         dev->hard_header_len    = ETH_HLEN;
 567         dev->min_header_len     = ETH_HLEN;
 568         dev->mtu                = ETH_DATA_LEN;
 569         dev->min_mtu            = ETH_MIN_MTU;
 570         dev->max_mtu            = ETH_DATA_LEN;
 571         dev->addr_len           = ETH_ALEN;
 572         dev->flags              = IFF_NOARP;
 573         dev->needs_free_netdev  = true;
 574         dev->priv_destructor    = xfrmi_dev_free;
 575         netif_keep_dst(dev);
 576
 577         eth_broadcast_addr(dev->broadcast);
 578 }
 579
 580 static int xfrmi_dev_init(struct net_device *dev)
 581 {
 582         struct xfrm_if *xi = netdev_priv(dev);
 583         struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link);
 584         int err;
 585
 586         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 587         if (!dev->tstats)
 588                 return -ENOMEM;
 589
 590         err = gro_cells_init(&xi->gro_cells, dev);
 591         if (err) {
 592                 free_percpu(dev->tstats);
 593                 return err;
 594         }
 595
 596         dev->features |= NETIF_F_LLTX;
 597
 598         if (phydev) {
 599                 dev->needed_headroom = phydev->needed_headroom;
 600                 dev->needed_tailroom = phydev->needed_tailroom;
 601
 602                 if (is_zero_ether_addr(dev->dev_addr))
 603                         eth_hw_addr_inherit(dev, phydev);
 604                 if (is_zero_ether_addr(dev->broadcast))
 605                         memcpy(dev->broadcast, phydev->broadcast,
 606                                dev->addr_len);
 607         } else {
 608                 eth_hw_addr_random(dev);
 609                 eth_broadcast_addr(dev->broadcast);
 610         }
 611
 612         return 0;
 613 }
 614
 615 static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
 616                          struct netlink_ext_ack *extack)
 617 {
 618         return 0;
 619 }
 620
 621 static void xfrmi_netlink_parms(struct nlattr *data[],
 622                                struct xfrm_if_parms *parms)
 623 {
 624         memset(parms, 0, sizeof(*parms));
 625
 626         if (!data)
 627                 return;
 628
 629         if (data[IFLA_XFRM_LINK])
 630                 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
 631
 632         if (data[IFLA_XFRM_IF_ID])
 633                 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
 634 }
 635
 636 static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
 637                         struct nlattr *tb[], struct nlattr *data[],
 638                         struct netlink_ext_ack *extack)
 639 {
 640         struct net *net = dev_net(dev);
 641         struct xfrm_if_parms p;
 642         struct xfrm_if *xi;
 643         int err;
 644
 645         xfrmi_netlink_parms(data, &p);
 646         xi = xfrmi_locate(net, &p);
 647         if (xi)
 648                 return -EEXIST;
 649
 650         xi = netdev_priv(dev);
 651         xi->p = p;
 652         xi->net = net;
 653         xi->dev = dev;
 654
 655         err = xfrmi_create(dev);
 656         return err;
 657 }
 658
 659 static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
 660 {
 661         unregister_netdevice_queue(dev, head);
 662 }
 663
 664 static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
 665                            struct nlattr *data[],
 666                            struct netlink_ext_ack *extack)
 667 {
 668         struct xfrm_if *xi = netdev_priv(dev);
 669         struct net *net = xi->net;
 670         struct xfrm_if_parms p;
 671
 672         xfrmi_netlink_parms(data, &p);
 673         xi = xfrmi_locate(net, &p);
 674         if (!xi) {
 675                 xi = netdev_priv(dev);
 676         } else {
 677                 if (xi->dev != dev)
 678                         return -EEXIST;
 679         }
 680
 681         return xfrmi_update(xi, &p);
 682 }
 683
 684 static size_t xfrmi_get_size(const struct net_device *dev)
 685 {
 686         return
 687                 /* IFLA_XFRM_LINK */
 688                 nla_total_size(4) +
 689                 /* IFLA_XFRM_IF_ID */
 690                 nla_total_size(4) +
 691                 0;
 692 }
 693
 694 static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
 695 {
 696         struct xfrm_if *xi = netdev_priv(dev);
 697         struct xfrm_if_parms *parm = &xi->p;
 698
 699         if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
 700             nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
 701                 goto nla_put_failure;
 702         return 0;
 703
 704 nla_put_failure:
 705         return -EMSGSIZE;
 706 }
 707
 708 static struct net *xfrmi_get_link_net(const struct net_device *dev)
 709 {
 710         struct xfrm_if *xi = netdev_priv(dev);
 711
 712         return xi->net;
 713 }
 714
 715 static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
 716         [IFLA_XFRM_LINK]        = { .type = NLA_U32 },
 717         [IFLA_XFRM_IF_ID]       = { .type = NLA_U32 },
 718 };
 719
 720 static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
 721         .kind           = "xfrm",
 722         .maxtype        = IFLA_XFRM_MAX,
 723         .policy         = xfrmi_policy,
 724         .priv_size      = sizeof(struct xfrm_if),
 725         .setup          = xfrmi_dev_setup,
 726         .validate       = xfrmi_validate,
 727         .newlink        = xfrmi_newlink,
 728         .dellink        = xfrmi_dellink,
 729         .changelink     = xfrmi_changelink,
 730         .get_size       = xfrmi_get_size,
 731         .fill_info      = xfrmi_fill_info,
 732         .get_link_net   = xfrmi_get_link_net,
 733 };
 734
 735 static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
 736 {
 737         struct xfrm_if *xi;
 738         LIST_HEAD(list);
 739
 740         xi = rtnl_dereference(xfrmn->xfrmi[0]);
 741         if (!xi)
 742                 return;
 743
 744         unregister_netdevice_queue(xi->dev, &list);
 745         unregister_netdevice_many(&list);
 746 }
 747
 748 static void __net_exit xfrmi_exit_net(struct net *net)
 749 {
 750         struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
 751
 752         rtnl_lock();
 753         xfrmi_destroy_interfaces(xfrmn);
 754         rtnl_unlock();
 755 }
 756
 757 static struct pernet_operations xfrmi_net_ops = {
 758         .exit = xfrmi_exit_net,
 759         .id   = &xfrmi_net_id,
 760         .size = sizeof(struct xfrmi_net),
 761 };
 762
 763 static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
 764         .handler        =       xfrm6_rcv,
 765         .cb_handler     =       xfrmi_rcv_cb,
 766         .err_handler    =       xfrmi6_err,
 767         .priority       =       10,
 768 };
 769
 770 static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
 771         .handler        =       xfrm6_rcv,
 772         .cb_handler     =       xfrmi_rcv_cb,
 773         .err_handler    =       xfrmi6_err,
 774         .priority       =       10,
 775 };
 776
 777 static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
 778         .handler        =       xfrm6_rcv,
 779         .cb_handler     =       xfrmi_rcv_cb,
 780         .err_handler    =       xfrmi6_err,
 781         .priority       =       10,
 782 };
 783
 784 static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
 785         .handler        =       xfrm4_rcv,
 786         .input_handler  =       xfrm_input,
 787         .cb_handler     =       xfrmi_rcv_cb,
 788         .err_handler    =       xfrmi4_err,
 789         .priority       =       10,
 790 };
 791
 792 static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
 793         .handler        =       xfrm4_rcv,
 794         .input_handler  =       xfrm_input,
 795         .cb_handler     =       xfrmi_rcv_cb,
 796         .err_handler    =       xfrmi4_err,
 797         .priority       =       10,
 798 };
 799
 800 static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
 801         .handler        =       xfrm4_rcv,
 802         .input_handler  =       xfrm_input,
 803         .cb_handler     =       xfrmi_rcv_cb,
 804         .err_handler    =       xfrmi4_err,
 805         .priority       =       10,
 806 };
 807
 808 static int __init xfrmi4_init(void)
 809 {
 810         int err;
 811
 812         err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
 813         if (err < 0)
 814                 goto xfrm_proto_esp_failed;
 815         err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
 816         if (err < 0)
 817                 goto xfrm_proto_ah_failed;
 818         err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
 819         if (err < 0)
 820                 goto xfrm_proto_comp_failed;
 821
 822         return 0;
 823
 824 xfrm_proto_comp_failed:
 825         xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
 826 xfrm_proto_ah_failed:
 827         xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
 828 xfrm_proto_esp_failed:
 829         return err;
 830 }
 831
 832 static void xfrmi4_fini(void)
 833 {
 834         xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
 835         xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
 836         xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
 837 }
 838
 839 static int __init xfrmi6_init(void)
 840 {
 841         int err;
 842
 843         err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
 844         if (err < 0)
 845                 goto xfrm_proto_esp_failed;
 846         err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
 847         if (err < 0)
 848                 goto xfrm_proto_ah_failed;
 849         err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
 850         if (err < 0)
 851                 goto xfrm_proto_comp_failed;
 852
 853         return 0;
 854
 855 xfrm_proto_comp_failed:
 856         xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
 857 xfrm_proto_ah_failed:
 858         xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
 859 xfrm_proto_esp_failed:
 860         return err;
 861 }
 862
 863 static void xfrmi6_fini(void)
 864 {
 865         xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
 866         xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
 867         xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
 868 }
 869
 870 static const struct xfrm_if_cb xfrm_if_cb = {
 871         .decode_session =       xfrmi_decode_session,
 872 };
 873
 874 static int __init xfrmi_init(void)
 875 {
 876         const char *msg;
 877         int err;
 878
 879         pr_info("IPsec XFRM device driver\n");
 880
 881         msg = "tunnel device";
 882         err = register_pernet_device(&xfrmi_net_ops);
 883         if (err < 0)
 884                 goto pernet_dev_failed;
 885
 886         msg = "xfrm4 protocols";
 887         err = xfrmi4_init();
 888         if (err < 0)
 889                 goto xfrmi4_failed;
 890
 891         msg = "xfrm6 protocols";
 892         err = xfrmi6_init();
 893         if (err < 0)
 894                 goto xfrmi6_failed;
 895
 896
 897         msg = "netlink interface";
 898         err = rtnl_link_register(&xfrmi_link_ops);
 899         if (err < 0)
 900                 goto rtnl_link_failed;
 901
 902         xfrm_if_register_cb(&xfrm_if_cb);
 903
 904         return err;
 905
 906 rtnl_link_failed:
 907         xfrmi6_fini();
 908 xfrmi6_failed:
 909         xfrmi4_fini();
 910 xfrmi4_failed:
 911         unregister_pernet_device(&xfrmi_net_ops);
 912 pernet_dev_failed:
 913         pr_err("xfrmi init: failed to register %s\n", msg);
 914         return err;
 915 }
 916
 917 static void __exit xfrmi_fini(void)
 918 {
 919         xfrm_if_unregister_cb();
 920         rtnl_link_unregister(&xfrmi_link_ops);
 921         xfrmi4_fini();
 922         xfrmi6_fini();
 923         unregister_pernet_device(&xfrmi_net_ops);
 924 }
 925
 926 module_init(xfrmi_init);
 927 module_exit(xfrmi_fini);
 928 MODULE_LICENSE("GPL");
 929 MODULE_ALIAS_RTNL_LINK("xfrm");
 930 MODULE_ALIAS_NETDEV("xfrm0");
 931 MODULE_AUTHOR("Steffen Klassert");
 932 MODULE_DESCRIPTION("XFRM virtual interface");