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 void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
  20                             unsigned int len, bool success, bool mcast)
  21 {
  22         if (likely(success)) {
  23                 struct ipvl_pcpu_stats *pcptr;
  24
  25                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
  26                 u64_stats_update_begin(&pcptr->syncp);
  27                 pcptr->rx_pkts++;
  28                 pcptr->rx_bytes += len;
  29                 if (mcast)
  30                         pcptr->rx_mcast++;
  31                 u64_stats_update_end(&pcptr->syncp);
  32         } else {
  33                 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
  34         }
  35 }
  36 EXPORT_SYMBOL_GPL(ipvlan_count_rx);
  37
  38 #if IS_ENABLED(CONFIG_IPV6)
  39 static u8 ipvlan_get_v6_hash(const void *iaddr)
  40 {
  41         const struct in6_addr *ip6_addr = iaddr;
  42
  43         return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
  44                IPVLAN_HASH_MASK;
  45 }
  46 #else
  47 static u8 ipvlan_get_v6_hash(const void *iaddr)
  48 {
  49         return 0;
  50 }
  51 #endif
  52
  53 static u8 ipvlan_get_v4_hash(const void *iaddr)
  54 {
  55         const struct in_addr *ip4_addr = iaddr;
  56
  57         return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
  58                IPVLAN_HASH_MASK;
  59 }
  60
  61 static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
  62 {
  63         if (!is_v6 && addr->atype == IPVL_IPV4) {
  64                 struct in_addr *i4addr = (struct in_addr *)iaddr;
  65
  66                 return addr->ip4addr.s_addr == i4addr->s_addr;
  67 #if IS_ENABLED(CONFIG_IPV6)
  68         } else if (is_v6 && addr->atype == IPVL_IPV6) {
  69                 struct in6_addr *i6addr = (struct in6_addr *)iaddr;
  70
  71                 return ipv6_addr_equal(&addr->ip6addr, i6addr);
  72 #endif
  73         }
  74
  75         return false;
  76 }
  77
  78 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
  79                                                const void *iaddr, bool is_v6)
  80 {
  81         struct ipvl_addr *addr;
  82         u8 hash;
  83
  84         hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
  85                ipvlan_get_v4_hash(iaddr);
  86         hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
  87                 if (addr_equal(is_v6, addr, iaddr))
  88                         return addr;
  89         return NULL;
  90 }
  91
  92 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
  93 {
  94         struct ipvl_port *port = ipvlan->port;
  95         u8 hash;
  96
  97         hash = (addr->atype == IPVL_IPV6) ?
  98                ipvlan_get_v6_hash(&addr->ip6addr) :
  99                ipvlan_get_v4_hash(&addr->ip4addr);
 100         if (hlist_unhashed(&addr->hlnode))
 101                 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
 102 }
 103
 104 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
 105 {
 106         hlist_del_init_rcu(&addr->hlnode);
 107 }
 108
 109 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
 110                                    const void *iaddr, bool is_v6)
 111 {
 112         struct ipvl_addr *addr;
 113
 114         list_for_each_entry(addr, &ipvlan->addrs, anode)
 115                 if (addr_equal(is_v6, addr, iaddr))
 116                         return addr;
 117         return NULL;
 118 }
 119
 120 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
 121 {
 122         struct ipvl_dev *ipvlan;
 123
 124         ASSERT_RTNL();
 125
 126         list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 127                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
 128                         return true;
 129         }
 130         return false;
 131 }
 132
 133 static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
 134 {
 135         void *lyr3h = NULL;
 136
 137         switch (skb->protocol) {
 138         case htons(ETH_P_ARP): {
 139                 struct arphdr *arph;
 140
 141                 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
 142                         return NULL;
 143
 144                 arph = arp_hdr(skb);
 145                 *type = IPVL_ARP;
 146                 lyr3h = arph;
 147                 break;
 148         }
 149         case htons(ETH_P_IP): {
 150                 u32 pktlen;
 151                 struct iphdr *ip4h;
 152
 153                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
 154                         return NULL;
 155
 156                 ip4h = ip_hdr(skb);
 157                 pktlen = ntohs(ip4h->tot_len);
 158                 if (ip4h->ihl < 5 || ip4h->version != 4)
 159                         return NULL;
 160                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
 161                         return NULL;
 162
 163                 *type = IPVL_IPV4;
 164                 lyr3h = ip4h;
 165                 break;
 166         }
 167 #if IS_ENABLED(CONFIG_IPV6)
 168         case htons(ETH_P_IPV6): {
 169                 struct ipv6hdr *ip6h;
 170
 171                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
 172                         return NULL;
 173
 174                 ip6h = ipv6_hdr(skb);
 175                 if (ip6h->version != 6)
 176                         return NULL;
 177
 178                 *type = IPVL_IPV6;
 179                 lyr3h = ip6h;
 180                 /* Only Neighbour Solicitation pkts need different treatment */
 181                 if (ipv6_addr_any(&ip6h->saddr) &&
 182                     ip6h->nexthdr == NEXTHDR_ICMP) {
 183                         struct icmp6hdr *icmph;
 184
 185                         if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
 186                                 return NULL;
 187
 188                         ip6h = ipv6_hdr(skb);
 189                         icmph = (struct icmp6hdr *)(ip6h + 1);
 190
 191                         if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 192                                 /* Need to access the ipv6 address in body */
 193                                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
 194                                                 + sizeof(struct in6_addr))))
 195                                         return NULL;
 196
 197                                 ip6h = ipv6_hdr(skb);
 198                                 icmph = (struct icmp6hdr *)(ip6h + 1);
 199                         }
 200
 201                         *type = IPVL_ICMPV6;
 202                         lyr3h = icmph;
 203                 }
 204                 break;
 205         }
 206 #endif
 207         default:
 208                 return NULL;
 209         }
 210
 211         return lyr3h;
 212 }
 213
 214 unsigned int ipvlan_mac_hash(const unsigned char *addr)
 215 {
 216         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
 217                                ipvlan_jhash_secret);
 218
 219         return hash & IPVLAN_MAC_FILTER_MASK;
 220 }
 221
 222 void ipvlan_process_multicast(struct work_struct *work)
 223 {
 224         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
 225         struct ethhdr *ethh;
 226         struct ipvl_dev *ipvlan;
 227         struct sk_buff *skb, *nskb;
 228         struct sk_buff_head list;
 229         unsigned int len;
 230         unsigned int mac_hash;
 231         int ret;
 232         u8 pkt_type;
 233         bool tx_pkt;
 234
 235         __skb_queue_head_init(&list);
 236
 237         spin_lock_bh(&port->backlog.lock);
 238         skb_queue_splice_tail_init(&port->backlog, &list);
 239         spin_unlock_bh(&port->backlog.lock);
 240
 241         while ((skb = __skb_dequeue(&list)) != NULL) {
 242                 struct net_device *dev = skb->dev;
 243                 bool consumed = false;
 244
 245                 ethh = eth_hdr(skb);
 246                 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
 247                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
 248
 249                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
 250                         pkt_type = PACKET_BROADCAST;
 251                 else
 252                         pkt_type = PACKET_MULTICAST;
 253
 254                 rcu_read_lock();
 255                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
 256                         if (tx_pkt && (ipvlan->dev == skb->dev))
 257                                 continue;
 258                         if (!test_bit(mac_hash, ipvlan->mac_filters))
 259                                 continue;
 260                         if (!(ipvlan->dev->flags & IFF_UP))
 261                                 continue;
 262                         ret = NET_RX_DROP;
 263                         len = skb->len + ETH_HLEN;
 264                         nskb = skb_clone(skb, GFP_ATOMIC);
 265                         local_bh_disable();
 266                         if (nskb) {
 267                                 consumed = true;
 268                                 nskb->pkt_type = pkt_type;
 269                                 nskb->dev = ipvlan->dev;
 270                                 if (tx_pkt)
 271                                         ret = dev_forward_skb(ipvlan->dev, nskb);
 272                                 else
 273                                         ret = netif_rx(nskb);
 274                         }
 275                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
 276                         local_bh_enable();
 277                 }
 278                 rcu_read_unlock();
 279
 280                 if (tx_pkt) {
 281                         /* If the packet originated here, send it out. */
 282                         skb->dev = port->dev;
 283                         skb->pkt_type = pkt_type;
 284                         dev_queue_xmit(skb);
 285                 } else {
 286                         if (consumed)
 287                                 consume_skb(skb);
 288                         else
 289                                 kfree_skb(skb);
 290                 }
 291                 if (dev)
 292                         dev_put(dev);
 293         }
 294 }
 295
 296 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
 297 {
 298         bool xnet = true;
 299
 300         if (dev)
 301                 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
 302
 303         skb_scrub_packet(skb, xnet);
 304         if (dev)
 305                 skb->dev = dev;
 306 }
 307
 308 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
 309                             bool local)
 310 {
 311         struct ipvl_dev *ipvlan = addr->master;
 312         struct net_device *dev = ipvlan->dev;
 313         unsigned int len;
 314         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
 315         bool success = false;
 316         struct sk_buff *skb = *pskb;
 317
 318         len = skb->len + ETH_HLEN;
 319         /* Only packets exchanged between two local slaves need to have
 320          * device-up check as well as skb-share check.
 321          */
 322         if (local) {
 323                 if (unlikely(!(dev->flags & IFF_UP))) {
 324                         kfree_skb(skb);
 325                         goto out;
 326                 }
 327
 328                 skb = skb_share_check(skb, GFP_ATOMIC);
 329                 if (!skb)
 330                         goto out;
 331
 332                 *pskb = skb;
 333         }
 334
 335         if (local) {
 336                 skb->pkt_type = PACKET_HOST;
 337                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
 338                         success = true;
 339         } else {
 340                 skb->dev = dev;
 341                 ret = RX_HANDLER_ANOTHER;
 342                 success = true;
 343         }
 344
 345 out:
 346         ipvlan_count_rx(ipvlan, len, success, false);
 347         return ret;
 348 }
 349
 350 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
 351                                             void *lyr3h, int addr_type,
 352                                             bool use_dest)
 353 {
 354         struct ipvl_addr *addr = NULL;
 355
 356         switch (addr_type) {
 357 #if IS_ENABLED(CONFIG_IPV6)
 358         case IPVL_IPV6: {
 359                 struct ipv6hdr *ip6h;
 360                 struct in6_addr *i6addr;
 361
 362                 ip6h = (struct ipv6hdr *)lyr3h;
 363                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
 364                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 365                 break;
 366         }
 367         case IPVL_ICMPV6: {
 368                 struct nd_msg *ndmh;
 369                 struct in6_addr *i6addr;
 370
 371                 /* Make sure that the NeighborSolicitation ICMPv6 packets
 372                  * are handled to avoid DAD issue.
 373                  */
 374                 ndmh = (struct nd_msg *)lyr3h;
 375                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 376                         i6addr = &ndmh->target;
 377                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 378                 }
 379                 break;
 380         }
 381 #endif
 382         case IPVL_IPV4: {
 383                 struct iphdr *ip4h;
 384                 __be32 *i4addr;
 385
 386                 ip4h = (struct iphdr *)lyr3h;
 387                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
 388                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
 389                 break;
 390         }
 391         case IPVL_ARP: {
 392                 struct arphdr *arph;
 393                 unsigned char *arp_ptr;
 394                 __be32 dip;
 395
 396                 arph = (struct arphdr *)lyr3h;
 397                 arp_ptr = (unsigned char *)(arph + 1);
 398                 if (use_dest)
 399                         arp_ptr += (2 * port->dev->addr_len) + 4;
 400                 else
 401                         arp_ptr += port->dev->addr_len;
 402
 403                 memcpy(&dip, arp_ptr, 4);
 404                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
 405                 break;
 406         }
 407         }
 408
 409         return addr;
 410 }
 411
 412 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
 413 {
 414         const struct iphdr *ip4h = ip_hdr(skb);
 415         struct net_device *dev = skb->dev;
 416         struct net *net = dev_net(dev);
 417         struct rtable *rt;
 418         int err, ret = NET_XMIT_DROP;
 419         struct flowi4 fl4 = {
 420                 .flowi4_oif = dev->ifindex,
 421                 .flowi4_tos = RT_TOS(ip4h->tos),
 422                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
 423                 .flowi4_mark = skb->mark,
 424                 .daddr = ip4h->daddr,
 425                 .saddr = ip4h->saddr,
 426         };
 427
 428         rt = ip_route_output_flow(net, &fl4, NULL);
 429         if (IS_ERR(rt))
 430                 goto err;
 431
 432         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
 433                 ip_rt_put(rt);
 434                 goto err;
 435         }
 436         skb_dst_set(skb, &rt->dst);
 437         err = ip_local_out(net, skb->sk, skb);
 438         if (unlikely(net_xmit_eval(err)))
 439                 dev->stats.tx_errors++;
 440         else
 441                 ret = NET_XMIT_SUCCESS;
 442         goto out;
 443 err:
 444         dev->stats.tx_errors++;
 445         kfree_skb(skb);
 446 out:
 447         return ret;
 448 }
 449
 450 #if IS_ENABLED(CONFIG_IPV6)
 451 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 452 {
 453         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
 454         struct net_device *dev = skb->dev;
 455         struct net *net = dev_net(dev);
 456         struct dst_entry *dst;
 457         int err, ret = NET_XMIT_DROP;
 458         struct flowi6 fl6 = {
 459                 .flowi6_oif = dev->ifindex,
 460                 .daddr = ip6h->daddr,
 461                 .saddr = ip6h->saddr,
 462                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
 463                 .flowlabel = ip6_flowinfo(ip6h),
 464                 .flowi6_mark = skb->mark,
 465                 .flowi6_proto = ip6h->nexthdr,
 466         };
 467
 468         dst = ip6_route_output(net, NULL, &fl6);
 469         if (dst->error) {
 470                 ret = dst->error;
 471                 dst_release(dst);
 472                 goto err;
 473         }
 474         skb_dst_set(skb, dst);
 475         err = ip6_local_out(net, skb->sk, skb);
 476         if (unlikely(net_xmit_eval(err)))
 477                 dev->stats.tx_errors++;
 478         else
 479                 ret = NET_XMIT_SUCCESS;
 480         goto out;
 481 err:
 482         dev->stats.tx_errors++;
 483         kfree_skb(skb);
 484 out:
 485         return ret;
 486 }
 487 #else
 488 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 489 {
 490         return NET_XMIT_DROP;
 491 }
 492 #endif
 493
 494 static int ipvlan_process_outbound(struct sk_buff *skb)
 495 {
 496         struct ethhdr *ethh = eth_hdr(skb);
 497         int ret = NET_XMIT_DROP;
 498
 499         /* In this mode we dont care about multicast and broadcast traffic */
 500         if (is_multicast_ether_addr(ethh->h_dest)) {
 501                 pr_debug_ratelimited("Dropped {multi|broad}cast of type=[%x]\n",
 502                                      ntohs(skb->protocol));
 503                 kfree_skb(skb);
 504                 goto out;
 505         }
 506
 507         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
 508          * will have L2; which need to discarded and processed further
 509          * in the net-ns of the main-device.
 510          */
 511         if (skb_mac_header_was_set(skb)) {
 512                 skb_pull(skb, sizeof(*ethh));
 513                 skb->mac_header = (typeof(skb->mac_header))~0U;
 514                 skb_reset_network_header(skb);
 515         }
 516
 517         if (skb->protocol == htons(ETH_P_IPV6))
 518                 ret = ipvlan_process_v6_outbound(skb);
 519         else if (skb->protocol == htons(ETH_P_IP))
 520                 ret = ipvlan_process_v4_outbound(skb);
 521         else {
 522                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
 523                                     ntohs(skb->protocol));
 524                 kfree_skb(skb);
 525         }
 526 out:
 527         return ret;
 528 }
 529
 530 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
 531                                      struct sk_buff *skb, bool tx_pkt)
 532 {
 533         if (skb->protocol == htons(ETH_P_PAUSE)) {
 534                 kfree_skb(skb);
 535                 return;
 536         }
 537
 538         /* Record that the deferred packet is from TX or RX path. By
 539          * looking at mac-addresses on packet will lead to erronus decisions.
 540          * (This would be true for a loopback-mode on master device or a
 541          * hair-pin mode of the switch.)
 542          */
 543         IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
 544
 545         spin_lock(&port->backlog.lock);
 546         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
 547                 if (skb->dev)
 548                         dev_hold(skb->dev);
 549                 __skb_queue_tail(&port->backlog, skb);
 550                 spin_unlock(&port->backlog.lock);
 551                 schedule_work(&port->wq);
 552         } else {
 553                 spin_unlock(&port->backlog.lock);
 554                 atomic_long_inc(&skb->dev->rx_dropped);
 555                 kfree_skb(skb);
 556         }
 557 }
 558
 559 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
 560 {
 561         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 562         void *lyr3h;
 563         struct ipvl_addr *addr;
 564         int addr_type;
 565
 566         lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
 567         if (!lyr3h)
 568                 goto out;
 569
 570         if (!ipvlan_is_vepa(ipvlan->port)) {
 571                 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 572                 if (addr) {
 573                         if (ipvlan_is_private(ipvlan->port)) {
 574                                 consume_skb(skb);
 575                                 return NET_XMIT_DROP;
 576                         }
 577                         return ipvlan_rcv_frame(addr, &skb, true);
 578                 }
 579         }
 580 out:
 581         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
 582         return ipvlan_process_outbound(skb);
 583 }
 584
 585 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
 586 {
 587         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 588         struct ethhdr *eth = eth_hdr(skb);
 589         struct ipvl_addr *addr;
 590         void *lyr3h;
 591         int addr_type;
 592
 593         if (!ipvlan_is_vepa(ipvlan->port) &&
 594             ether_addr_equal(eth->h_dest, eth->h_source)) {
 595                 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
 596                 if (lyr3h) {
 597                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 598                         if (addr) {
 599                                 if (ipvlan_is_private(ipvlan->port)) {
 600                                         consume_skb(skb);
 601                                         return NET_XMIT_DROP;
 602                                 }
 603                                 return ipvlan_rcv_frame(addr, &skb, true);
 604                         }
 605                 }
 606                 skb = skb_share_check(skb, GFP_ATOMIC);
 607                 if (!skb)
 608                         return NET_XMIT_DROP;
 609
 610                 /* Packet definitely does not belong to any of the
 611                  * virtual devices, but the dest is local. So forward
 612                  * the skb for the main-dev. At the RX side we just return
 613                  * RX_PASS for it to be processed further on the stack.
 614                  */
 615                 return dev_forward_skb(ipvlan->phy_dev, skb);
 616
 617         } else if (is_multicast_ether_addr(eth->h_dest)) {
 618                 ipvlan_skb_crossing_ns(skb, NULL);
 619                 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
 620                 return NET_XMIT_SUCCESS;
 621         }
 622
 623         skb->dev = ipvlan->phy_dev;
 624         return dev_queue_xmit(skb);
 625 }
 626
 627 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 628 {
 629         struct ipvl_dev *ipvlan = netdev_priv(dev);
 630         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
 631
 632         if (!port)
 633                 goto out;
 634
 635         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
 636                 goto out;
 637
 638         switch(port->mode) {
 639         case IPVLAN_MODE_L2:
 640                 return ipvlan_xmit_mode_l2(skb, dev);
 641         case IPVLAN_MODE_L3:
 642         case IPVLAN_MODE_L3S:
 643                 return ipvlan_xmit_mode_l3(skb, dev);
 644         }
 645
 646         /* Should not reach here */
 647         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
 648                           port->mode);
 649 out:
 650         kfree_skb(skb);
 651         return NET_XMIT_DROP;
 652 }
 653
 654 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
 655 {
 656         struct ethhdr *eth = eth_hdr(skb);
 657         struct ipvl_addr *addr;
 658         void *lyr3h;
 659         int addr_type;
 660
 661         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
 662                 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
 663                 if (!lyr3h)
 664                         return true;
 665
 666                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
 667                 if (addr)
 668                         return false;
 669         }
 670
 671         return true;
 672 }
 673
 674 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
 675                                                  struct ipvl_port *port)
 676 {
 677         void *lyr3h;
 678         int addr_type;
 679         struct ipvl_addr *addr;
 680         struct sk_buff *skb = *pskb;
 681         rx_handler_result_t ret = RX_HANDLER_PASS;
 682
 683         lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
 684         if (!lyr3h)
 685                 goto out;
 686
 687         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 688         if (addr)
 689                 ret = ipvlan_rcv_frame(addr, pskb, false);
 690
 691 out:
 692         return ret;
 693 }
 694
 695 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
 696                                                  struct ipvl_port *port)
 697 {
 698         struct sk_buff *skb = *pskb;
 699         struct ethhdr *eth = eth_hdr(skb);
 700         rx_handler_result_t ret = RX_HANDLER_PASS;
 701
 702         if (is_multicast_ether_addr(eth->h_dest)) {
 703                 if (ipvlan_external_frame(skb, port)) {
 704                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 705
 706                         /* External frames are queued for device local
 707                          * distribution, but a copy is given to master
 708                          * straight away to avoid sending duplicates later
 709                          * when work-queue processes this frame. This is
 710                          * achieved by returning RX_HANDLER_PASS.
 711                          */
 712                         if (nskb) {
 713                                 ipvlan_skb_crossing_ns(nskb, NULL);
 714                                 ipvlan_multicast_enqueue(port, nskb, false);
 715                         }
 716                 }
 717         } else {
 718                 /* Perform like l3 mode for non-multicast packet */
 719                 ret = ipvlan_handle_mode_l3(pskb, port);
 720         }
 721
 722         return ret;
 723 }
 724
 725 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
 726 {
 727         struct sk_buff *skb = *pskb;
 728         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
 729
 730         if (!port)
 731                 return RX_HANDLER_PASS;
 732
 733         switch (port->mode) {
 734         case IPVLAN_MODE_L2:
 735                 return ipvlan_handle_mode_l2(pskb, port);
 736         case IPVLAN_MODE_L3:
 737                 return ipvlan_handle_mode_l3(pskb, port);
 738         case IPVLAN_MODE_L3S:
 739                 return RX_HANDLER_PASS;
 740         }
 741
 742         /* Should not reach here */
 743         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
 744                           port->mode);
 745         kfree_skb(skb);
 746         return RX_HANDLER_CONSUMED;
 747 }
 748
 749 static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
 750                                             struct net_device *dev)
 751 {
 752         struct ipvl_addr *addr = NULL;
 753         struct ipvl_port *port;
 754         void *lyr3h;
 755         int addr_type;
 756
 757         if (!dev || !netif_is_ipvlan_port(dev))
 758                 goto out;
 759
 760         port = ipvlan_port_get_rcu(dev);
 761         if (!port || port->mode != IPVLAN_MODE_L3S)
 762                 goto out;
 763
 764         lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
 765         if (!lyr3h)
 766                 goto out;
 767
 768         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 769 out:
 770         return addr;
 771 }
 772
 773 struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
 774                               u16 proto)
 775 {
 776         struct ipvl_addr *addr;
 777         struct net_device *sdev;
 778
 779         addr = ipvlan_skb_to_addr(skb, dev);
 780         if (!addr)
 781                 goto out;
 782
 783         sdev = addr->master->dev;
 784         switch (proto) {
 785         case AF_INET:
 786         {
 787                 int err;
 788                 struct iphdr *ip4h = ip_hdr(skb);
 789
 790                 err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
 791                                            ip4h->tos, sdev);
 792                 if (unlikely(err))
 793                         goto out;
 794                 break;
 795         }
 796 #if IS_ENABLED(CONFIG_IPV6)
 797         case AF_INET6:
 798         {
 799                 struct dst_entry *dst;
 800                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 801                 int flags = RT6_LOOKUP_F_HAS_SADDR;
 802                 struct flowi6 fl6 = {
 803                         .flowi6_iif   = sdev->ifindex,
 804                         .daddr        = ip6h->daddr,
 805                         .saddr        = ip6h->saddr,
 806                         .flowlabel    = ip6_flowinfo(ip6h),
 807                         .flowi6_mark  = skb->mark,
 808                         .flowi6_proto = ip6h->nexthdr,
 809                 };
 810
 811                 skb_dst_drop(skb);
 812                 dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags);
 813                 skb_dst_set(skb, dst);
 814                 break;
 815         }
 816 #endif
 817         default:
 818                 break;
 819         }
 820
 821 out:
 822         return skb;
 823 }
 824
 825 unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
 826                              const struct nf_hook_state *state)
 827 {
 828         struct ipvl_addr *addr;
 829         unsigned int len;
 830
 831         addr = ipvlan_skb_to_addr(skb, skb->dev);
 832         if (!addr)
 833                 goto out;
 834
 835         skb->dev = addr->master->dev;
 836         len = skb->len + ETH_HLEN;
 837         ipvlan_count_rx(addr->master, len, true, false);
 838 out:
 839         return NF_ACCEPT;
 840 }