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, bool sync)
  89 {
  90         hlist_del_init_rcu(&addr->hlnode);
  91         if (sync)
  92                 synchronize_rcu();
  93 }
  94
  95 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
  96                                    const void *iaddr, bool is_v6)
  97 {
  98         struct ipvl_addr *addr;
  99
 100         list_for_each_entry(addr, &ipvlan->addrs, anode) {
 101                 if ((is_v6 && addr->atype == IPVL_IPV6 &&
 102                     ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
 103                     (!is_v6 && addr->atype == IPVL_IPV4 &&
 104                     addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
 105                         return addr;
 106         }
 107         return NULL;
 108 }
 109
 110 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
 111 {
 112         struct ipvl_dev *ipvlan;
 113
 114         ASSERT_RTNL();
 115
 116         list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 117                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
 118                         return true;
 119         }
 120         return false;
 121 }
 122
 123 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
 124 {
 125         void *lyr3h = NULL;
 126
 127         switch (skb->protocol) {
 128         case htons(ETH_P_ARP): {
 129                 struct arphdr *arph;
 130
 131                 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
 132                         return NULL;
 133
 134                 arph = arp_hdr(skb);
 135                 *type = IPVL_ARP;
 136                 lyr3h = arph;
 137                 break;
 138         }
 139         case htons(ETH_P_IP): {
 140                 u32 pktlen;
 141                 struct iphdr *ip4h;
 142
 143                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
 144                         return NULL;
 145
 146                 ip4h = ip_hdr(skb);
 147                 pktlen = ntohs(ip4h->tot_len);
 148                 if (ip4h->ihl < 5 || ip4h->version != 4)
 149                         return NULL;
 150                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
 151                         return NULL;
 152
 153                 *type = IPVL_IPV4;
 154                 lyr3h = ip4h;
 155                 break;
 156         }
 157         case htons(ETH_P_IPV6): {
 158                 struct ipv6hdr *ip6h;
 159
 160                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
 161                         return NULL;
 162
 163                 ip6h = ipv6_hdr(skb);
 164                 if (ip6h->version != 6)
 165                         return NULL;
 166
 167                 *type = IPVL_IPV6;
 168                 lyr3h = ip6h;
 169                 /* Only Neighbour Solicitation pkts need different treatment */
 170                 if (ipv6_addr_any(&ip6h->saddr) &&
 171                     ip6h->nexthdr == NEXTHDR_ICMP) {
 172                         *type = IPVL_ICMPV6;
 173                         lyr3h = ip6h + 1;
 174                 }
 175                 break;
 176         }
 177         default:
 178                 return NULL;
 179         }
 180
 181         return lyr3h;
 182 }
 183
 184 unsigned int ipvlan_mac_hash(const unsigned char *addr)
 185 {
 186         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
 187                                ipvlan_jhash_secret);
 188
 189         return hash & IPVLAN_MAC_FILTER_MASK;
 190 }
 191
 192 void ipvlan_process_multicast(struct work_struct *work)
 193 {
 194         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
 195         struct ethhdr *ethh;
 196         struct ipvl_dev *ipvlan;
 197         struct sk_buff *skb, *nskb;
 198         struct sk_buff_head list;
 199         unsigned int len;
 200         unsigned int mac_hash;
 201         int ret;
 202         u8 pkt_type;
 203         bool hlocal, dlocal;
 204
 205         __skb_queue_head_init(&list);
 206
 207         spin_lock_bh(&port->backlog.lock);
 208         skb_queue_splice_tail_init(&port->backlog, &list);
 209         spin_unlock_bh(&port->backlog.lock);
 210
 211         while ((skb = __skb_dequeue(&list)) != NULL) {
 212                 ethh = eth_hdr(skb);
 213                 hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr);
 214                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
 215
 216                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
 217                         pkt_type = PACKET_BROADCAST;
 218                 else
 219                         pkt_type = PACKET_MULTICAST;
 220
 221                 dlocal = false;
 222                 rcu_read_lock();
 223                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
 224                         if (hlocal && (ipvlan->dev == skb->dev)) {
 225                                 dlocal = true;
 226                                 continue;
 227                         }
 228                         if (!test_bit(mac_hash, ipvlan->mac_filters))
 229                                 continue;
 230
 231                         ret = NET_RX_DROP;
 232                         len = skb->len + ETH_HLEN;
 233                         nskb = skb_clone(skb, GFP_ATOMIC);
 234                         if (!nskb)
 235                                 goto acct;
 236
 237                         nskb->pkt_type = pkt_type;
 238                         nskb->dev = ipvlan->dev;
 239                         if (hlocal)
 240                                 ret = dev_forward_skb(ipvlan->dev, nskb);
 241                         else
 242                                 ret = netif_rx(nskb);
 243 acct:
 244                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
 245                 }
 246                 rcu_read_unlock();
 247
 248                 if (dlocal) {
 249                         /* If the packet originated here, send it out. */
 250                         skb->dev = port->dev;
 251                         skb->pkt_type = pkt_type;
 252                         dev_queue_xmit(skb);
 253                 } else {
 254                         kfree_skb(skb);
 255                 }
 256         }
 257 }
 258
 259 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb,
 260                             bool local)
 261 {
 262         struct ipvl_dev *ipvlan = addr->master;
 263         struct net_device *dev = ipvlan->dev;
 264         unsigned int len;
 265         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
 266         bool success = false;
 267
 268         len = skb->len + ETH_HLEN;
 269         if (unlikely(!(dev->flags & IFF_UP))) {
 270                 kfree_skb(skb);
 271                 goto out;
 272         }
 273
 274         skb = skb_share_check(skb, GFP_ATOMIC);
 275         if (!skb)
 276                 goto out;
 277
 278         skb->dev = dev;
 279         skb->pkt_type = PACKET_HOST;
 280
 281         if (local) {
 282                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
 283                         success = true;
 284         } else {
 285                 ret = RX_HANDLER_ANOTHER;
 286                 success = true;
 287         }
 288
 289 out:
 290         ipvlan_count_rx(ipvlan, len, success, false);
 291         return ret;
 292 }
 293
 294 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
 295                                             void *lyr3h, int addr_type,
 296                                             bool use_dest)
 297 {
 298         struct ipvl_addr *addr = NULL;
 299
 300         if (addr_type == IPVL_IPV6) {
 301                 struct ipv6hdr *ip6h;
 302                 struct in6_addr *i6addr;
 303
 304                 ip6h = (struct ipv6hdr *)lyr3h;
 305                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
 306                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 307         } else if (addr_type == IPVL_ICMPV6) {
 308                 struct nd_msg *ndmh;
 309                 struct in6_addr *i6addr;
 310
 311                 /* Make sure that the NeighborSolicitation ICMPv6 packets
 312                  * are handled to avoid DAD issue.
 313                  */
 314                 ndmh = (struct nd_msg *)lyr3h;
 315                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 316                         i6addr = &ndmh->target;
 317                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 318                 }
 319         } else if (addr_type == IPVL_IPV4) {
 320                 struct iphdr *ip4h;
 321                 __be32 *i4addr;
 322
 323                 ip4h = (struct iphdr *)lyr3h;
 324                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
 325                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
 326         } else if (addr_type == IPVL_ARP) {
 327                 struct arphdr *arph;
 328                 unsigned char *arp_ptr;
 329                 __be32 dip;
 330
 331                 arph = (struct arphdr *)lyr3h;
 332                 arp_ptr = (unsigned char *)(arph + 1);
 333                 if (use_dest)
 334                         arp_ptr += (2 * port->dev->addr_len) + 4;
 335                 else
 336                         arp_ptr += port->dev->addr_len;
 337
 338                 memcpy(&dip, arp_ptr, 4);
 339                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
 340         }
 341
 342         return addr;
 343 }
 344
 345 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
 346 {
 347         const struct iphdr *ip4h = ip_hdr(skb);
 348         struct net_device *dev = skb->dev;
 349         struct rtable *rt;
 350         int err, ret = NET_XMIT_DROP;
 351         struct flowi4 fl4 = {
 352                 .flowi4_oif = dev_get_iflink(dev),
 353                 .flowi4_tos = RT_TOS(ip4h->tos),
 354                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
 355                 .daddr = ip4h->daddr,
 356                 .saddr = ip4h->saddr,
 357         };
 358
 359         rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
 360         if (IS_ERR(rt))
 361                 goto err;
 362
 363         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
 364                 ip_rt_put(rt);
 365                 goto err;
 366         }
 367         skb_dst_drop(skb);
 368         skb_dst_set(skb, &rt->dst);
 369         err = ip_local_out(skb);
 370         if (unlikely(net_xmit_eval(err)))
 371                 dev->stats.tx_errors++;
 372         else
 373                 ret = NET_XMIT_SUCCESS;
 374         goto out;
 375 err:
 376         dev->stats.tx_errors++;
 377         kfree_skb(skb);
 378 out:
 379         return ret;
 380 }
 381
 382 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 383 {
 384         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
 385         struct net_device *dev = skb->dev;
 386         struct dst_entry *dst;
 387         int err, ret = NET_XMIT_DROP;
 388         struct flowi6 fl6 = {
 389                 .flowi6_iif = skb->dev->ifindex,
 390                 .daddr = ip6h->daddr,
 391                 .saddr = ip6h->saddr,
 392                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
 393                 .flowlabel = ip6_flowinfo(ip6h),
 394                 .flowi6_mark = skb->mark,
 395                 .flowi6_proto = ip6h->nexthdr,
 396         };
 397
 398         dst = ip6_route_output(dev_net(dev), NULL, &fl6);
 399         if (dst->error) {
 400                 ret = dst->error;
 401                 dst_release(dst);
 402                 goto err;
 403         }
 404         skb_dst_drop(skb);
 405         skb_dst_set(skb, dst);
 406         err = ip6_local_out(skb);
 407         if (unlikely(net_xmit_eval(err)))
 408                 dev->stats.tx_errors++;
 409         else
 410                 ret = NET_XMIT_SUCCESS;
 411         goto out;
 412 err:
 413         dev->stats.tx_errors++;
 414         kfree_skb(skb);
 415 out:
 416         return ret;
 417 }
 418
 419 static int ipvlan_process_outbound(struct sk_buff *skb,
 420                                    const struct ipvl_dev *ipvlan)
 421 {
 422         struct ethhdr *ethh = eth_hdr(skb);
 423         int ret = NET_XMIT_DROP;
 424
 425         /* In this mode we dont care about multicast and broadcast traffic */
 426         if (is_multicast_ether_addr(ethh->h_dest)) {
 427                 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
 428                                     ntohs(skb->protocol));
 429                 kfree_skb(skb);
 430                 goto out;
 431         }
 432
 433         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
 434          * will have L2; which need to discarded and processed further
 435          * in the net-ns of the main-device.
 436          */
 437         if (skb_mac_header_was_set(skb)) {
 438                 skb_pull(skb, sizeof(*ethh));
 439                 skb->mac_header = (typeof(skb->mac_header))~0U;
 440                 skb_reset_network_header(skb);
 441         }
 442
 443         if (skb->protocol == htons(ETH_P_IPV6))
 444                 ret = ipvlan_process_v6_outbound(skb);
 445         else if (skb->protocol == htons(ETH_P_IP))
 446                 ret = ipvlan_process_v4_outbound(skb);
 447         else {
 448                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
 449                                     ntohs(skb->protocol));
 450                 kfree_skb(skb);
 451         }
 452 out:
 453         return ret;
 454 }
 455
 456 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
 457                                      struct sk_buff *skb)
 458 {
 459         if (skb->protocol == htons(ETH_P_PAUSE)) {
 460                 kfree_skb(skb);
 461                 return;
 462         }
 463
 464         spin_lock(&port->backlog.lock);
 465         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
 466                 __skb_queue_tail(&port->backlog, skb);
 467                 spin_unlock(&port->backlog.lock);
 468                 schedule_work(&port->wq);
 469         } else {
 470                 spin_unlock(&port->backlog.lock);
 471                 atomic_long_inc(&skb->dev->rx_dropped);
 472                 kfree_skb(skb);
 473         }
 474 }
 475
 476 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
 477 {
 478         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 479         void *lyr3h;
 480         struct ipvl_addr *addr;
 481         int addr_type;
 482
 483         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 484         if (!lyr3h)
 485                 goto out;
 486
 487         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 488         if (addr)
 489                 return ipvlan_rcv_frame(addr, skb, true);
 490
 491 out:
 492         skb->dev = ipvlan->phy_dev;
 493         return ipvlan_process_outbound(skb, ipvlan);
 494 }
 495
 496 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
 497 {
 498         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 499         struct ethhdr *eth = eth_hdr(skb);
 500         struct ipvl_addr *addr;
 501         void *lyr3h;
 502         int addr_type;
 503
 504         if (ether_addr_equal(eth->h_dest, eth->h_source)) {
 505                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 506                 if (lyr3h) {
 507                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 508                         if (addr)
 509                                 return ipvlan_rcv_frame(addr, skb, true);
 510                 }
 511                 skb = skb_share_check(skb, GFP_ATOMIC);
 512                 if (!skb)
 513                         return NET_XMIT_DROP;
 514
 515                 /* Packet definitely does not belong to any of the
 516                  * virtual devices, but the dest is local. So forward
 517                  * the skb for the main-dev. At the RX side we just return
 518                  * RX_PASS for it to be processed further on the stack.
 519                  */
 520                 return dev_forward_skb(ipvlan->phy_dev, skb);
 521
 522         } else if (is_multicast_ether_addr(eth->h_dest)) {
 523                 ipvlan_multicast_enqueue(ipvlan->port, skb);
 524                 return NET_XMIT_SUCCESS;
 525         }
 526
 527         skb->dev = ipvlan->phy_dev;
 528         return dev_queue_xmit(skb);
 529 }
 530
 531 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 532 {
 533         struct ipvl_dev *ipvlan = netdev_priv(dev);
 534         struct ipvl_port *port = ipvlan_port_get_rcu(ipvlan->phy_dev);
 535
 536         if (!port)
 537                 goto out;
 538
 539         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
 540                 goto out;
 541
 542         switch(port->mode) {
 543         case IPVLAN_MODE_L2:
 544                 return ipvlan_xmit_mode_l2(skb, dev);
 545         case IPVLAN_MODE_L3:
 546                 return ipvlan_xmit_mode_l3(skb, dev);
 547         }
 548
 549         /* Should not reach here */
 550         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
 551                           port->mode);
 552 out:
 553         kfree_skb(skb);
 554         return NET_XMIT_DROP;
 555 }
 556
 557 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
 558 {
 559         struct ethhdr *eth = eth_hdr(skb);
 560         struct ipvl_addr *addr;
 561         void *lyr3h;
 562         int addr_type;
 563
 564         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
 565                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 566                 if (!lyr3h)
 567                         return true;
 568
 569                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
 570                 if (addr)
 571                         return false;
 572         }
 573
 574         return true;
 575 }
 576
 577 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
 578                                                  struct ipvl_port *port)
 579 {
 580         void *lyr3h;
 581         int addr_type;
 582         struct ipvl_addr *addr;
 583         struct sk_buff *skb = *pskb;
 584         rx_handler_result_t ret = RX_HANDLER_PASS;
 585
 586         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 587         if (!lyr3h)
 588                 goto out;
 589
 590         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 591         if (addr)
 592                 ret = ipvlan_rcv_frame(addr, skb, false);
 593
 594 out:
 595         return ret;
 596 }
 597
 598 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
 599                                                  struct ipvl_port *port)
 600 {
 601         struct sk_buff *skb = *pskb;
 602         struct ethhdr *eth = eth_hdr(skb);
 603         rx_handler_result_t ret = RX_HANDLER_PASS;
 604         void *lyr3h;
 605         int addr_type;
 606
 607         if (is_multicast_ether_addr(eth->h_dest)) {
 608                 if (ipvlan_external_frame(skb, port)) {
 609                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 610
 611                         /* External frames are queued for device local
 612                          * distribution, but a copy is given to master
 613                          * straight away to avoid sending duplicates later
 614                          * when work-queue processes this frame. This is
 615                          * achieved by returning RX_HANDLER_PASS.
 616                          */
 617                         if (nskb)
 618                                 ipvlan_multicast_enqueue(port, nskb);
 619                 }
 620         } else {
 621                 struct ipvl_addr *addr;
 622
 623                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 624                 if (!lyr3h)
 625                         return ret;
 626
 627                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 628                 if (addr)
 629                         ret = ipvlan_rcv_frame(addr, skb, false);
 630         }
 631
 632         return ret;
 633 }
 634
 635 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
 636 {
 637         struct sk_buff *skb = *pskb;
 638         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
 639
 640         if (!port)
 641                 return RX_HANDLER_PASS;
 642
 643         switch (port->mode) {
 644         case IPVLAN_MODE_L2:
 645                 return ipvlan_handle_mode_l2(pskb, port);
 646         case IPVLAN_MODE_L3:
 647                 return ipvlan_handle_mode_l3(pskb, port);
 648         }
 649
 650         /* Should not reach here */
 651         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
 652                           port->mode);
 653         kfree_skb(skb);
 654         return NET_RX_DROP;
 655 }