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 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 int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb,
 258                             bool local)
 259 {
 260         struct ipvl_dev *ipvlan = addr->master;
 261         struct net_device *dev = ipvlan->dev;
 262         unsigned int len;
 263         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
 264         bool success = false;
 265
 266         len = skb->len + ETH_HLEN;
 267         if (unlikely(!(dev->flags & IFF_UP))) {
 268                 kfree_skb(skb);
 269                 goto out;
 270         }
 271
 272         skb = skb_share_check(skb, GFP_ATOMIC);
 273         if (!skb)
 274                 goto out;
 275
 276         skb->dev = dev;
 277         skb->pkt_type = PACKET_HOST;
 278
 279         if (local) {
 280                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
 281                         success = true;
 282         } else {
 283                 ret = RX_HANDLER_ANOTHER;
 284                 success = true;
 285         }
 286
 287 out:
 288         ipvlan_count_rx(ipvlan, len, success, false);
 289         return ret;
 290 }
 291
 292 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
 293                                             void *lyr3h, int addr_type,
 294                                             bool use_dest)
 295 {
 296         struct ipvl_addr *addr = NULL;
 297
 298         if (addr_type == IPVL_IPV6) {
 299                 struct ipv6hdr *ip6h;
 300                 struct in6_addr *i6addr;
 301
 302                 ip6h = (struct ipv6hdr *)lyr3h;
 303                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
 304                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 305         } else if (addr_type == IPVL_ICMPV6) {
 306                 struct nd_msg *ndmh;
 307                 struct in6_addr *i6addr;
 308
 309                 /* Make sure that the NeighborSolicitation ICMPv6 packets
 310                  * are handled to avoid DAD issue.
 311                  */
 312                 ndmh = (struct nd_msg *)lyr3h;
 313                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 314                         i6addr = &ndmh->target;
 315                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 316                 }
 317         } else if (addr_type == IPVL_IPV4) {
 318                 struct iphdr *ip4h;
 319                 __be32 *i4addr;
 320
 321                 ip4h = (struct iphdr *)lyr3h;
 322                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
 323                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
 324         } else if (addr_type == IPVL_ARP) {
 325                 struct arphdr *arph;
 326                 unsigned char *arp_ptr;
 327                 __be32 dip;
 328
 329                 arph = (struct arphdr *)lyr3h;
 330                 arp_ptr = (unsigned char *)(arph + 1);
 331                 if (use_dest)
 332                         arp_ptr += (2 * port->dev->addr_len) + 4;
 333                 else
 334                         arp_ptr += port->dev->addr_len;
 335
 336                 memcpy(&dip, arp_ptr, 4);
 337                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
 338         }
 339
 340         return addr;
 341 }
 342
 343 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
 344 {
 345         const struct iphdr *ip4h = ip_hdr(skb);
 346         struct net_device *dev = skb->dev;
 347         struct rtable *rt;
 348         int err, ret = NET_XMIT_DROP;
 349         struct flowi4 fl4 = {
 350                 .flowi4_oif = dev_get_iflink(dev),
 351                 .flowi4_tos = RT_TOS(ip4h->tos),
 352                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
 353                 .daddr = ip4h->daddr,
 354                 .saddr = ip4h->saddr,
 355         };
 356
 357         rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
 358         if (IS_ERR(rt))
 359                 goto err;
 360
 361         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
 362                 ip_rt_put(rt);
 363                 goto err;
 364         }
 365         skb_dst_drop(skb);
 366         skb_dst_set(skb, &rt->dst);
 367         err = ip_local_out(skb);
 368         if (unlikely(net_xmit_eval(err)))
 369                 dev->stats.tx_errors++;
 370         else
 371                 ret = NET_XMIT_SUCCESS;
 372         goto out;
 373 err:
 374         dev->stats.tx_errors++;
 375         kfree_skb(skb);
 376 out:
 377         return ret;
 378 }
 379
 380 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 381 {
 382         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
 383         struct net_device *dev = skb->dev;
 384         struct dst_entry *dst;
 385         int err, ret = NET_XMIT_DROP;
 386         struct flowi6 fl6 = {
 387                 .flowi6_iif = skb->dev->ifindex,
 388                 .daddr = ip6h->daddr,
 389                 .saddr = ip6h->saddr,
 390                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
 391                 .flowlabel = ip6_flowinfo(ip6h),
 392                 .flowi6_mark = skb->mark,
 393                 .flowi6_proto = ip6h->nexthdr,
 394         };
 395
 396         dst = ip6_route_output(dev_net(dev), NULL, &fl6);
 397         if (dst->error) {
 398                 ret = dst->error;
 399                 dst_release(dst);
 400                 goto err;
 401         }
 402         skb_dst_drop(skb);
 403         skb_dst_set(skb, dst);
 404         err = ip6_local_out(skb);
 405         if (unlikely(net_xmit_eval(err)))
 406                 dev->stats.tx_errors++;
 407         else
 408                 ret = NET_XMIT_SUCCESS;
 409         goto out;
 410 err:
 411         dev->stats.tx_errors++;
 412         kfree_skb(skb);
 413 out:
 414         return ret;
 415 }
 416
 417 static int ipvlan_process_outbound(struct sk_buff *skb,
 418                                    const struct ipvl_dev *ipvlan)
 419 {
 420         struct ethhdr *ethh = eth_hdr(skb);
 421         int ret = NET_XMIT_DROP;
 422
 423         /* In this mode we dont care about multicast and broadcast traffic */
 424         if (is_multicast_ether_addr(ethh->h_dest)) {
 425                 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
 426                                     ntohs(skb->protocol));
 427                 kfree_skb(skb);
 428                 goto out;
 429         }
 430
 431         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
 432          * will have L2; which need to discarded and processed further
 433          * in the net-ns of the main-device.
 434          */
 435         if (skb_mac_header_was_set(skb)) {
 436                 skb_pull(skb, sizeof(*ethh));
 437                 skb->mac_header = (typeof(skb->mac_header))~0U;
 438                 skb_reset_network_header(skb);
 439         }
 440
 441         if (skb->protocol == htons(ETH_P_IPV6))
 442                 ret = ipvlan_process_v6_outbound(skb);
 443         else if (skb->protocol == htons(ETH_P_IP))
 444                 ret = ipvlan_process_v4_outbound(skb);
 445         else {
 446                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
 447                                     ntohs(skb->protocol));
 448                 kfree_skb(skb);
 449         }
 450 out:
 451         return ret;
 452 }
 453
 454 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
 455                                      struct sk_buff *skb)
 456 {
 457         if (skb->protocol == htons(ETH_P_PAUSE)) {
 458                 kfree_skb(skb);
 459                 return;
 460         }
 461
 462         spin_lock(&port->backlog.lock);
 463         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
 464                 __skb_queue_tail(&port->backlog, skb);
 465                 spin_unlock(&port->backlog.lock);
 466                 schedule_work(&port->wq);
 467         } else {
 468                 spin_unlock(&port->backlog.lock);
 469                 atomic_long_inc(&skb->dev->rx_dropped);
 470                 kfree_skb(skb);
 471         }
 472 }
 473
 474 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
 475 {
 476         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 477         void *lyr3h;
 478         struct ipvl_addr *addr;
 479         int addr_type;
 480
 481         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 482         if (!lyr3h)
 483                 goto out;
 484
 485         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 486         if (addr)
 487                 return ipvlan_rcv_frame(addr, skb, true);
 488
 489 out:
 490         skb->dev = ipvlan->phy_dev;
 491         return ipvlan_process_outbound(skb, ipvlan);
 492 }
 493
 494 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
 495 {
 496         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 497         struct ethhdr *eth = eth_hdr(skb);
 498         struct ipvl_addr *addr;
 499         void *lyr3h;
 500         int addr_type;
 501
 502         if (ether_addr_equal(eth->h_dest, eth->h_source)) {
 503                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 504                 if (lyr3h) {
 505                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 506                         if (addr)
 507                                 return ipvlan_rcv_frame(addr, skb, true);
 508                 }
 509                 skb = skb_share_check(skb, GFP_ATOMIC);
 510                 if (!skb)
 511                         return NET_XMIT_DROP;
 512
 513                 /* Packet definitely does not belong to any of the
 514                  * virtual devices, but the dest is local. So forward
 515                  * the skb for the main-dev. At the RX side we just return
 516                  * RX_PASS for it to be processed further on the stack.
 517                  */
 518                 return dev_forward_skb(ipvlan->phy_dev, skb);
 519
 520         } else if (is_multicast_ether_addr(eth->h_dest)) {
 521                 ipvlan_multicast_enqueue(ipvlan->port, skb);
 522                 return NET_XMIT_SUCCESS;
 523         }
 524
 525         skb->dev = ipvlan->phy_dev;
 526         return dev_queue_xmit(skb);
 527 }
 528
 529 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 530 {
 531         struct ipvl_dev *ipvlan = netdev_priv(dev);
 532         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
 533
 534         if (!port)
 535                 goto out;
 536
 537         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
 538                 goto out;
 539
 540         switch(port->mode) {
 541         case IPVLAN_MODE_L2:
 542                 return ipvlan_xmit_mode_l2(skb, dev);
 543         case IPVLAN_MODE_L3:
 544                 return ipvlan_xmit_mode_l3(skb, dev);
 545         }
 546
 547         /* Should not reach here */
 548         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
 549                           port->mode);
 550 out:
 551         kfree_skb(skb);
 552         return NET_XMIT_DROP;
 553 }
 554
 555 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
 556 {
 557         struct ethhdr *eth = eth_hdr(skb);
 558         struct ipvl_addr *addr;
 559         void *lyr3h;
 560         int addr_type;
 561
 562         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
 563                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 564                 if (!lyr3h)
 565                         return true;
 566
 567                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
 568                 if (addr)
 569                         return false;
 570         }
 571
 572         return true;
 573 }
 574
 575 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
 576                                                  struct ipvl_port *port)
 577 {
 578         void *lyr3h;
 579         int addr_type;
 580         struct ipvl_addr *addr;
 581         struct sk_buff *skb = *pskb;
 582         rx_handler_result_t ret = RX_HANDLER_PASS;
 583
 584         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 585         if (!lyr3h)
 586                 goto out;
 587
 588         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 589         if (addr)
 590                 ret = ipvlan_rcv_frame(addr, skb, false);
 591
 592 out:
 593         return ret;
 594 }
 595
 596 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
 597                                                  struct ipvl_port *port)
 598 {
 599         struct sk_buff *skb = *pskb;
 600         struct ethhdr *eth = eth_hdr(skb);
 601         rx_handler_result_t ret = RX_HANDLER_PASS;
 602         void *lyr3h;
 603         int addr_type;
 604
 605         if (is_multicast_ether_addr(eth->h_dest)) {
 606                 if (ipvlan_external_frame(skb, port)) {
 607                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 608
 609                         /* External frames are queued for device local
 610                          * distribution, but a copy is given to master
 611                          * straight away to avoid sending duplicates later
 612                          * when work-queue processes this frame. This is
 613                          * achieved by returning RX_HANDLER_PASS.
 614                          */
 615                         if (nskb)
 616                                 ipvlan_multicast_enqueue(port, nskb);
 617                 }
 618         } else {
 619                 struct ipvl_addr *addr;
 620
 621                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 622                 if (!lyr3h)
 623                         return ret;
 624
 625                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 626                 if (addr)
 627                         ret = ipvlan_rcv_frame(addr, skb, false);
 628         }
 629
 630         return ret;
 631 }
 632
 633 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
 634 {
 635         struct sk_buff *skb = *pskb;
 636         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
 637
 638         if (!port)
 639                 return RX_HANDLER_PASS;
 640
 641         switch (port->mode) {
 642         case IPVLAN_MODE_L2:
 643                 return ipvlan_handle_mode_l2(pskb, port);
 644         case IPVLAN_MODE_L3:
 645                 return ipvlan_handle_mode_l3(pskb, port);
 646         }
 647
 648         /* Should not reach here */
 649         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
 650                           port->mode);
 651         kfree_skb(skb);
 652         return NET_RX_DROP;
 653 }