drivers/net/ipvlan/ipvlan_core.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  */
   9
  10 #include "ipvlan.h"
  11
  12 static u32 ipvlan_jhash_secret __read_mostly;
  13
  14 void ipvlan_init_secret(void)
  15 {
  16         net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
  17 }
  18
  19 static void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
  20                             unsigned int len, bool success, bool mcast)
  21 {
  22         if (!ipvlan)
  23                 return;
  24
  25         if (likely(success)) {
  26                 struct ipvl_pcpu_stats *pcptr;
  27
  28                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
  29                 u64_stats_update_begin(&pcptr->syncp);
  30                 pcptr->rx_pkts++;
  31                 pcptr->rx_bytes += len;
  32                 if (mcast)
  33                         pcptr->rx_mcast++;
  34                 u64_stats_update_end(&pcptr->syncp);
  35         } else {
  36                 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
  37         }
  38 }
  39
  40 static u8 ipvlan_get_v6_hash(const void *iaddr)
  41 {
  42         const struct in6_addr *ip6_addr = iaddr;
  43
  44         return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
  45                IPVLAN_HASH_MASK;
  46 }
  47
  48 static u8 ipvlan_get_v4_hash(const void *iaddr)
  49 {
  50         const struct in_addr *ip4_addr = iaddr;
  51
  52         return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
  53                IPVLAN_HASH_MASK;
  54 }
  55
  56 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
  57                                                const void *iaddr, bool is_v6)
  58 {
  59         struct ipvl_addr *addr;
  60         u8 hash;
  61
  62         hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
  63                ipvlan_get_v4_hash(iaddr);
  64         hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) {
  65                 if (is_v6 && addr->atype == IPVL_IPV6 &&
  66                     ipv6_addr_equal(&addr->ip6addr, iaddr))
  67                         return addr;
  68                 else if (!is_v6 && addr->atype == IPVL_IPV4 &&
  69                          addr->ip4addr.s_addr ==
  70                                 ((struct in_addr *)iaddr)->s_addr)
  71                         return addr;
  72         }
  73         return NULL;
  74 }
  75
  76 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
  77 {
  78         struct ipvl_port *port = ipvlan->port;
  79         u8 hash;
  80
  81         hash = (addr->atype == IPVL_IPV6) ?
  82                ipvlan_get_v6_hash(&addr->ip6addr) :
  83                ipvlan_get_v4_hash(&addr->ip4addr);
  84         if (hlist_unhashed(&addr->hlnode))
  85                 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
  86 }
  87
  88 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
  89 {
  90         hlist_del_init_rcu(&addr->hlnode);
  91 }
  92
  93 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
  94                                    const void *iaddr, bool is_v6)
  95 {
  96         struct ipvl_addr *addr;
  97
  98         list_for_each_entry(addr, &ipvlan->addrs, anode) {
  99                 if ((is_v6 && addr->atype == IPVL_IPV6 &&
 100                     ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
 101                     (!is_v6 && addr->atype == IPVL_IPV4 &&
 102                     addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
 103                         return addr;
 104         }
 105         return NULL;
 106 }
 107
 108 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
 109 {
 110         struct ipvl_dev *ipvlan;
 111
 112         ASSERT_RTNL();
 113
 114         list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 115                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
 116                         return true;
 117         }
 118         return false;
 119 }
 120
 121 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
 122 {
 123         void *lyr3h = NULL;
 124
 125         switch (skb->protocol) {
 126         case htons(ETH_P_ARP): {
 127                 struct arphdr *arph;
 128
 129                 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
 130                         return NULL;
 131
 132                 arph = arp_hdr(skb);
 133                 *type = IPVL_ARP;
 134                 lyr3h = arph;
 135                 break;
 136         }
 137         case htons(ETH_P_IP): {
 138                 u32 pktlen;
 139                 struct iphdr *ip4h;
 140
 141                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
 142                         return NULL;
 143
 144                 ip4h = ip_hdr(skb);
 145                 pktlen = ntohs(ip4h->tot_len);
 146                 if (ip4h->ihl < 5 || ip4h->version != 4)
 147                         return NULL;
 148                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
 149                         return NULL;
 150
 151                 *type = IPVL_IPV4;
 152                 lyr3h = ip4h;
 153                 break;
 154         }
 155         case htons(ETH_P_IPV6): {
 156                 struct ipv6hdr *ip6h;
 157
 158                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
 159                         return NULL;
 160
 161                 ip6h = ipv6_hdr(skb);
 162                 if (ip6h->version != 6)
 163                         return NULL;
 164
 165                 *type = IPVL_IPV6;
 166                 lyr3h = ip6h;
 167                 /* Only Neighbour Solicitation pkts need different treatment */
 168                 if (ipv6_addr_any(&ip6h->saddr) &&
 169                     ip6h->nexthdr == NEXTHDR_ICMP) {
 170                         *type = IPVL_ICMPV6;
 171                         lyr3h = ip6h + 1;
 172                 }
 173                 break;
 174         }
 175         default:
 176                 return NULL;
 177         }
 178
 179         return lyr3h;
 180 }
 181
 182 unsigned int ipvlan_mac_hash(const unsigned char *addr)
 183 {
 184         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
 185                                ipvlan_jhash_secret);
 186
 187         return hash & IPVLAN_MAC_FILTER_MASK;
 188 }
 189
 190 void ipvlan_process_multicast(struct work_struct *work)
 191 {
 192         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
 193         struct ethhdr *ethh;
 194         struct ipvl_dev *ipvlan;
 195         struct sk_buff *skb, *nskb;
 196         struct sk_buff_head list;
 197         unsigned int len;
 198         unsigned int mac_hash;
 199         int ret;
 200         u8 pkt_type;
 201         bool hlocal, dlocal;
 202
 203         __skb_queue_head_init(&list);
 204
 205         spin_lock_bh(&port->backlog.lock);
 206         skb_queue_splice_tail_init(&port->backlog, &list);
 207         spin_unlock_bh(&port->backlog.lock);
 208
 209         while ((skb = __skb_dequeue(&list)) != NULL) {
 210                 ethh = eth_hdr(skb);
 211                 hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr);
 212                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
 213
 214                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
 215                         pkt_type = PACKET_BROADCAST;
 216                 else
 217                         pkt_type = PACKET_MULTICAST;
 218
 219                 dlocal = false;
 220                 rcu_read_lock();
 221                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
 222                         if (hlocal && (ipvlan->dev == skb->dev)) {
 223                                 dlocal = true;
 224                                 continue;
 225                         }
 226                         if (!test_bit(mac_hash, ipvlan->mac_filters))
 227                                 continue;
 228
 229                         ret = NET_RX_DROP;
 230                         len = skb->len + ETH_HLEN;
 231                         nskb = skb_clone(skb, GFP_ATOMIC);
 232                         if (!nskb)
 233                                 goto acct;
 234
 235                         nskb->pkt_type = pkt_type;
 236                         nskb->dev = ipvlan->dev;
 237                         if (hlocal)
 238                                 ret = dev_forward_skb(ipvlan->dev, nskb);
 239                         else
 240                                 ret = netif_rx(nskb);
 241 acct:
 242                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
 243                 }
 244                 rcu_read_unlock();
 245
 246                 if (dlocal) {
 247                         /* If the packet originated here, send it out. */
 248                         skb->dev = port->dev;
 249                         skb->pkt_type = pkt_type;
 250                         dev_queue_xmit(skb);
 251                 } else {
 252                         kfree_skb(skb);
 253                 }
 254         }
 255 }
 256
 257 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
 258 {
 259         bool xnet = true;
 260
 261         if (dev)
 262                 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
 263
 264         skb_scrub_packet(skb, xnet);
 265         if (dev)
 266                 skb->dev = dev;
 267 }
 268
 269 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
 270                             bool local)
 271 {
 272         struct ipvl_dev *ipvlan = addr->master;
 273         struct net_device *dev = ipvlan->dev;
 274         unsigned int len;
 275         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
 276         bool success = false;
 277         struct sk_buff *skb = *pskb;
 278
 279         len = skb->len + ETH_HLEN;
 280         /* Only packets exchanged between two local slaves need to have
 281          * device-up check as well as skb-share check.
 282          */
 283         if (local) {
 284                 if (unlikely(!(dev->flags & IFF_UP))) {
 285                         kfree_skb(skb);
 286                         goto out;
 287                 }
 288
 289                 skb = skb_share_check(skb, GFP_ATOMIC);
 290                 if (!skb)
 291                         goto out;
 292
 293                 *pskb = skb;
 294         }
 295         ipvlan_skb_crossing_ns(skb, dev);
 296
 297         if (local) {
 298                 skb->pkt_type = PACKET_HOST;
 299                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
 300                         success = true;
 301         } else {
 302                 ret = RX_HANDLER_ANOTHER;
 303                 success = true;
 304         }
 305
 306 out:
 307         ipvlan_count_rx(ipvlan, len, success, false);
 308         return ret;
 309 }
 310
 311 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
 312                                             void *lyr3h, int addr_type,
 313                                             bool use_dest)
 314 {
 315         struct ipvl_addr *addr = NULL;
 316
 317         if (addr_type == IPVL_IPV6) {
 318                 struct ipv6hdr *ip6h;
 319                 struct in6_addr *i6addr;
 320
 321                 ip6h = (struct ipv6hdr *)lyr3h;
 322                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
 323                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 324         } else if (addr_type == IPVL_ICMPV6) {
 325                 struct nd_msg *ndmh;
 326                 struct in6_addr *i6addr;
 327
 328                 /* Make sure that the NeighborSolicitation ICMPv6 packets
 329                  * are handled to avoid DAD issue.
 330                  */
 331                 ndmh = (struct nd_msg *)lyr3h;
 332                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 333                         i6addr = &ndmh->target;
 334                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 335                 }
 336         } else if (addr_type == IPVL_IPV4) {
 337                 struct iphdr *ip4h;
 338                 __be32 *i4addr;
 339
 340                 ip4h = (struct iphdr *)lyr3h;
 341                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
 342                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
 343         } else if (addr_type == IPVL_ARP) {
 344                 struct arphdr *arph;
 345                 unsigned char *arp_ptr;
 346                 __be32 dip;
 347
 348                 arph = (struct arphdr *)lyr3h;
 349                 arp_ptr = (unsigned char *)(arph + 1);
 350                 if (use_dest)
 351                         arp_ptr += (2 * port->dev->addr_len) + 4;
 352                 else
 353                         arp_ptr += port->dev->addr_len;
 354
 355                 memcpy(&dip, arp_ptr, 4);
 356                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
 357         }
 358
 359         return addr;
 360 }
 361
 362 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
 363 {
 364         const struct iphdr *ip4h = ip_hdr(skb);
 365         struct net_device *dev = skb->dev;
 366         struct net *net = dev_net(dev);
 367         struct rtable *rt;
 368         int err, ret = NET_XMIT_DROP;
 369         struct flowi4 fl4 = {
 370                 .flowi4_oif = dev->ifindex,
 371                 .flowi4_tos = RT_TOS(ip4h->tos),
 372                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
 373                 .daddr = ip4h->daddr,
 374                 .saddr = ip4h->saddr,
 375         };
 376
 377         rt = ip_route_output_flow(net, &fl4, NULL);
 378         if (IS_ERR(rt))
 379                 goto err;
 380
 381         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
 382                 ip_rt_put(rt);
 383                 goto err;
 384         }
 385         skb_dst_set(skb, &rt->dst);
 386         err = ip_local_out(net, skb->sk, skb);
 387         if (unlikely(net_xmit_eval(err)))
 388                 dev->stats.tx_errors++;
 389         else
 390                 ret = NET_XMIT_SUCCESS;
 391         goto out;
 392 err:
 393         dev->stats.tx_errors++;
 394         kfree_skb(skb);
 395 out:
 396         return ret;
 397 }
 398
 399 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 400 {
 401         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
 402         struct net_device *dev = skb->dev;
 403         struct net *net = dev_net(dev);
 404         struct dst_entry *dst;
 405         int err, ret = NET_XMIT_DROP;
 406         struct flowi6 fl6 = {
 407                 .flowi6_iif = dev->ifindex,
 408                 .daddr = ip6h->daddr,
 409                 .saddr = ip6h->saddr,
 410                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
 411                 .flowlabel = ip6_flowinfo(ip6h),
 412                 .flowi6_mark = skb->mark,
 413                 .flowi6_proto = ip6h->nexthdr,
 414         };
 415
 416         dst = ip6_route_output(net, NULL, &fl6);
 417         if (dst->error) {
 418                 ret = dst->error;
 419                 dst_release(dst);
 420                 goto err;
 421         }
 422         skb_dst_set(skb, dst);
 423         err = ip6_local_out(net, skb->sk, skb);
 424         if (unlikely(net_xmit_eval(err)))
 425                 dev->stats.tx_errors++;
 426         else
 427                 ret = NET_XMIT_SUCCESS;
 428         goto out;
 429 err:
 430         dev->stats.tx_errors++;
 431         kfree_skb(skb);
 432 out:
 433         return ret;
 434 }
 435
 436 static int ipvlan_process_outbound(struct sk_buff *skb)
 437 {
 438         struct ethhdr *ethh = eth_hdr(skb);
 439         int ret = NET_XMIT_DROP;
 440
 441         /* In this mode we dont care about multicast and broadcast traffic */
 442         if (is_multicast_ether_addr(ethh->h_dest)) {
 443                 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
 444                                     ntohs(skb->protocol));
 445                 kfree_skb(skb);
 446                 goto out;
 447         }
 448
 449         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
 450          * will have L2; which need to discarded and processed further
 451          * in the net-ns of the main-device.
 452          */
 453         if (skb_mac_header_was_set(skb)) {
 454                 skb_pull(skb, sizeof(*ethh));
 455                 skb->mac_header = (typeof(skb->mac_header))~0U;
 456                 skb_reset_network_header(skb);
 457         }
 458
 459         if (skb->protocol == htons(ETH_P_IPV6))
 460                 ret = ipvlan_process_v6_outbound(skb);
 461         else if (skb->protocol == htons(ETH_P_IP))
 462                 ret = ipvlan_process_v4_outbound(skb);
 463         else {
 464                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
 465                                     ntohs(skb->protocol));
 466                 kfree_skb(skb);
 467         }
 468 out:
 469         return ret;
 470 }
 471
 472 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
 473                                      struct sk_buff *skb)
 474 {
 475         if (skb->protocol == htons(ETH_P_PAUSE)) {
 476                 kfree_skb(skb);
 477                 return;
 478         }
 479
 480         spin_lock(&port->backlog.lock);
 481         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
 482                 __skb_queue_tail(&port->backlog, skb);
 483                 spin_unlock(&port->backlog.lock);
 484                 schedule_work(&port->wq);
 485         } else {
 486                 spin_unlock(&port->backlog.lock);
 487                 atomic_long_inc(&skb->dev->rx_dropped);
 488                 kfree_skb(skb);
 489         }
 490 }
 491
 492 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
 493 {
 494         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 495         void *lyr3h;
 496         struct ipvl_addr *addr;
 497         int addr_type;
 498
 499         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 500         if (!lyr3h)
 501                 goto out;
 502
 503         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 504         if (addr)
 505                 return ipvlan_rcv_frame(addr, &skb, true);
 506
 507 out:
 508         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
 509         return ipvlan_process_outbound(skb);
 510 }
 511
 512 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
 513 {
 514         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 515         struct ethhdr *eth = eth_hdr(skb);
 516         struct ipvl_addr *addr;
 517         void *lyr3h;
 518         int addr_type;
 519
 520         if (ether_addr_equal(eth->h_dest, eth->h_source)) {
 521                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 522                 if (lyr3h) {
 523                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 524                         if (addr)
 525                                 return ipvlan_rcv_frame(addr, &skb, true);
 526                 }
 527                 skb = skb_share_check(skb, GFP_ATOMIC);
 528                 if (!skb)
 529                         return NET_XMIT_DROP;
 530
 531                 /* Packet definitely does not belong to any of the
 532                  * virtual devices, but the dest is local. So forward
 533                  * the skb for the main-dev. At the RX side we just return
 534                  * RX_PASS for it to be processed further on the stack.
 535                  */
 536                 return dev_forward_skb(ipvlan->phy_dev, skb);
 537
 538         } else if (is_multicast_ether_addr(eth->h_dest)) {
 539                 ipvlan_skb_crossing_ns(skb, NULL);
 540                 ipvlan_multicast_enqueue(ipvlan->port, skb);
 541                 return NET_XMIT_SUCCESS;
 542         }
 543
 544         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
 545         return dev_queue_xmit(skb);
 546 }
 547
 548 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 549 {
 550         struct ipvl_dev *ipvlan = netdev_priv(dev);
 551         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
 552
 553         if (!port)
 554                 goto out;
 555
 556         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
 557                 goto out;
 558
 559         switch(port->mode) {
 560         case IPVLAN_MODE_L2:
 561                 return ipvlan_xmit_mode_l2(skb, dev);
 562         case IPVLAN_MODE_L3:
 563         case IPVLAN_MODE_L3S:
 564                 return ipvlan_xmit_mode_l3(skb, dev);
 565         }
 566
 567         /* Should not reach here */
 568         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
 569                           port->mode);
 570 out:
 571         kfree_skb(skb);
 572         return NET_XMIT_DROP;
 573 }
 574
 575 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
 576 {
 577         struct ethhdr *eth = eth_hdr(skb);
 578         struct ipvl_addr *addr;
 579         void *lyr3h;
 580         int addr_type;
 581
 582         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
 583                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 584                 if (!lyr3h)
 585                         return true;
 586
 587                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
 588                 if (addr)
 589                         return false;
 590         }
 591
 592         return true;
 593 }
 594
 595 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
 596                                                  struct ipvl_port *port)
 597 {
 598         void *lyr3h;
 599         int addr_type;
 600         struct ipvl_addr *addr;
 601         struct sk_buff *skb = *pskb;
 602         rx_handler_result_t ret = RX_HANDLER_PASS;
 603
 604         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 605         if (!lyr3h)
 606                 goto out;
 607
 608         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 609         if (addr)
 610                 ret = ipvlan_rcv_frame(addr, pskb, false);
 611
 612 out:
 613         return ret;
 614 }
 615
 616 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
 617                                                  struct ipvl_port *port)
 618 {
 619         struct sk_buff *skb = *pskb;
 620         struct ethhdr *eth = eth_hdr(skb);
 621         rx_handler_result_t ret = RX_HANDLER_PASS;
 622         void *lyr3h;
 623         int addr_type;
 624
 625         if (is_multicast_ether_addr(eth->h_dest)) {
 626                 if (ipvlan_external_frame(skb, port)) {
 627                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 628
 629                         /* External frames are queued for device local
 630                          * distribution, but a copy is given to master
 631                          * straight away to avoid sending duplicates later
 632                          * when work-queue processes this frame. This is
 633                          * achieved by returning RX_HANDLER_PASS.
 634                          */
 635                         if (nskb) {
 636                                 ipvlan_skb_crossing_ns(nskb, NULL);
 637                                 ipvlan_multicast_enqueue(port, nskb);
 638                         }
 639                 }
 640         } else {
 641                 struct ipvl_addr *addr;
 642
 643                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 644                 if (!lyr3h)
 645                         return ret;
 646
 647                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 648                 if (addr)
 649                         ret = ipvlan_rcv_frame(addr, pskb, false);
 650         }
 651
 652         return ret;
 653 }
 654
 655 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
 656 {
 657         struct sk_buff *skb = *pskb;
 658         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
 659
 660         if (!port)
 661                 return RX_HANDLER_PASS;
 662
 663         switch (port->mode) {
 664         case IPVLAN_MODE_L2:
 665                 return ipvlan_handle_mode_l2(pskb, port);
 666         case IPVLAN_MODE_L3:
 667                 return ipvlan_handle_mode_l3(pskb, port);
 668         case IPVLAN_MODE_L3S:
 669                 return RX_HANDLER_PASS;
 670         }
 671
 672         /* Should not reach here */
 673         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
 674                           port->mode);
 675         kfree_skb(skb);
 676         return RX_HANDLER_CONSUMED;
 677 }
 678
 679 static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
 680                                             struct net_device *dev)
 681 {
 682         struct ipvl_addr *addr = NULL;
 683         struct ipvl_port *port;
 684         void *lyr3h;
 685         int addr_type;
 686
 687         if (!dev || !netif_is_ipvlan_port(dev))
 688                 goto out;
 689
 690         port = ipvlan_port_get_rcu(dev);
 691         if (!port || port->mode != IPVLAN_MODE_L3S)
 692                 goto out;
 693
 694         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 695         if (!lyr3h)
 696                 goto out;
 697
 698         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 699 out:
 700         return addr;
 701 }
 702
 703 struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
 704                               u16 proto)
 705 {
 706         struct ipvl_addr *addr;
 707         struct net_device *sdev;
 708
 709         addr = ipvlan_skb_to_addr(skb, dev);
 710         if (!addr)
 711                 goto out;
 712
 713         sdev = addr->master->dev;
 714         switch (proto) {
 715         case AF_INET:
 716         {
 717                 int err;
 718                 struct iphdr *ip4h = ip_hdr(skb);
 719
 720                 err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
 721                                            ip4h->tos, sdev);
 722                 if (unlikely(err))
 723                         goto out;
 724                 break;
 725         }
 726         case AF_INET6:
 727         {
 728                 struct dst_entry *dst;
 729                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 730                 int flags = RT6_LOOKUP_F_HAS_SADDR;
 731                 struct flowi6 fl6 = {
 732                         .flowi6_iif   = sdev->ifindex,
 733                         .daddr        = ip6h->daddr,
 734                         .saddr        = ip6h->saddr,
 735                         .flowlabel    = ip6_flowinfo(ip6h),
 736                         .flowi6_mark  = skb->mark,
 737                         .flowi6_proto = ip6h->nexthdr,
 738                 };
 739
 740                 skb_dst_drop(skb);
 741                 dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags);
 742                 skb_dst_set(skb, dst);
 743                 break;
 744         }
 745         default:
 746                 break;
 747         }
 748
 749 out:
 750         return skb;
 751 }
 752
 753 unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
 754                              const struct nf_hook_state *state)
 755 {
 756         struct ipvl_addr *addr;
 757         unsigned int len;
 758
 759         addr = ipvlan_skb_to_addr(skb, skb->dev);
 760         if (!addr)
 761                 goto out;
 762
 763         skb->dev = addr->master->dev;
 764         len = skb->len + ETH_HLEN;
 765         ipvlan_count_rx(addr->master, len, true, false);
 766 out:
 767         return NF_ACCEPT;
 768 }