drivers/net/ipvlan/ipvlan_core.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <[email protected]>
   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, *ret = NULL;
 113
 114         rcu_read_lock();
 115         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
 116                 if (addr_equal(is_v6, addr, iaddr)) {
 117                         ret = addr;
 118                         break;
 119                 }
 120         }
 121         rcu_read_unlock();
 122         return ret;
 123 }
 124
 125 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
 126 {
 127         struct ipvl_dev *ipvlan;
 128         bool ret = false;
 129
 130         rcu_read_lock();
 131         list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
 132                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
 133                         ret = true;
 134                         break;
 135                 }
 136         }
 137         rcu_read_unlock();
 138         return ret;
 139 }
 140
 141 static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
 142 {
 143         void *lyr3h = NULL;
 144
 145         switch (skb->protocol) {
 146         case htons(ETH_P_ARP): {
 147                 struct arphdr *arph;
 148
 149                 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
 150                         return NULL;
 151
 152                 arph = arp_hdr(skb);
 153                 *type = IPVL_ARP;
 154                 lyr3h = arph;
 155                 break;
 156         }
 157         case htons(ETH_P_IP): {
 158                 u32 pktlen;
 159                 struct iphdr *ip4h;
 160
 161                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
 162                         return NULL;
 163
 164                 ip4h = ip_hdr(skb);
 165                 pktlen = ntohs(ip4h->tot_len);
 166                 if (ip4h->ihl < 5 || ip4h->version != 4)
 167                         return NULL;
 168                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
 169                         return NULL;
 170
 171                 *type = IPVL_IPV4;
 172                 lyr3h = ip4h;
 173                 break;
 174         }
 175 #if IS_ENABLED(CONFIG_IPV6)
 176         case htons(ETH_P_IPV6): {
 177                 struct ipv6hdr *ip6h;
 178
 179                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
 180                         return NULL;
 181
 182                 ip6h = ipv6_hdr(skb);
 183                 if (ip6h->version != 6)
 184                         return NULL;
 185
 186                 *type = IPVL_IPV6;
 187                 lyr3h = ip6h;
 188                 /* Only Neighbour Solicitation pkts need different treatment */
 189                 if (ipv6_addr_any(&ip6h->saddr) &&
 190                     ip6h->nexthdr == NEXTHDR_ICMP) {
 191                         struct icmp6hdr *icmph;
 192
 193                         if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
 194                                 return NULL;
 195
 196                         ip6h = ipv6_hdr(skb);
 197                         icmph = (struct icmp6hdr *)(ip6h + 1);
 198
 199                         if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 200                                 /* Need to access the ipv6 address in body */
 201                                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
 202                                                 + sizeof(struct in6_addr))))
 203                                         return NULL;
 204
 205                                 ip6h = ipv6_hdr(skb);
 206                                 icmph = (struct icmp6hdr *)(ip6h + 1);
 207                         }
 208
 209                         *type = IPVL_ICMPV6;
 210                         lyr3h = icmph;
 211                 }
 212                 break;
 213         }
 214 #endif
 215         default:
 216                 return NULL;
 217         }
 218
 219         return lyr3h;
 220 }
 221
 222 unsigned int ipvlan_mac_hash(const unsigned char *addr)
 223 {
 224         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
 225                                ipvlan_jhash_secret);
 226
 227         return hash & IPVLAN_MAC_FILTER_MASK;
 228 }
 229
 230 void ipvlan_process_multicast(struct work_struct *work)
 231 {
 232         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
 233         struct ethhdr *ethh;
 234         struct ipvl_dev *ipvlan;
 235         struct sk_buff *skb, *nskb;
 236         struct sk_buff_head list;
 237         unsigned int len;
 238         unsigned int mac_hash;
 239         int ret;
 240         u8 pkt_type;
 241         bool tx_pkt;
 242
 243         __skb_queue_head_init(&list);
 244
 245         spin_lock_bh(&port->backlog.lock);
 246         skb_queue_splice_tail_init(&port->backlog, &list);
 247         spin_unlock_bh(&port->backlog.lock);
 248
 249         while ((skb = __skb_dequeue(&list)) != NULL) {
 250                 struct net_device *dev = skb->dev;
 251                 bool consumed = false;
 252
 253                 ethh = eth_hdr(skb);
 254                 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
 255                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
 256
 257                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
 258                         pkt_type = PACKET_BROADCAST;
 259                 else
 260                         pkt_type = PACKET_MULTICAST;
 261
 262                 rcu_read_lock();
 263                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
 264                         if (tx_pkt && (ipvlan->dev == skb->dev))
 265                                 continue;
 266                         if (!test_bit(mac_hash, ipvlan->mac_filters))
 267                                 continue;
 268                         if (!(ipvlan->dev->flags & IFF_UP))
 269                                 continue;
 270                         ret = NET_RX_DROP;
 271                         len = skb->len + ETH_HLEN;
 272                         nskb = skb_clone(skb, GFP_ATOMIC);
 273                         local_bh_disable();
 274                         if (nskb) {
 275                                 consumed = true;
 276                                 nskb->pkt_type = pkt_type;
 277                                 nskb->dev = ipvlan->dev;
 278                                 if (tx_pkt)
 279                                         ret = dev_forward_skb(ipvlan->dev, nskb);
 280                                 else
 281                                         ret = netif_rx(nskb);
 282                         }
 283                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
 284                         local_bh_enable();
 285                 }
 286                 rcu_read_unlock();
 287
 288                 if (tx_pkt) {
 289                         /* If the packet originated here, send it out. */
 290                         skb->dev = port->dev;
 291                         skb->pkt_type = pkt_type;
 292                         dev_queue_xmit(skb);
 293                 } else {
 294                         if (consumed)
 295                                 consume_skb(skb);
 296                         else
 297                                 kfree_skb(skb);
 298                 }
 299                 if (dev)
 300                         dev_put(dev);
 301         }
 302 }
 303
 304 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
 305 {
 306         bool xnet = true;
 307
 308         if (dev)
 309                 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
 310
 311         skb_scrub_packet(skb, xnet);
 312         if (dev)
 313                 skb->dev = dev;
 314 }
 315
 316 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
 317                             bool local)
 318 {
 319         struct ipvl_dev *ipvlan = addr->master;
 320         struct net_device *dev = ipvlan->dev;
 321         unsigned int len;
 322         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
 323         bool success = false;
 324         struct sk_buff *skb = *pskb;
 325
 326         len = skb->len + ETH_HLEN;
 327         /* Only packets exchanged between two local slaves need to have
 328          * device-up check as well as skb-share check.
 329          */
 330         if (local) {
 331                 if (unlikely(!(dev->flags & IFF_UP))) {
 332                         kfree_skb(skb);
 333                         goto out;
 334                 }
 335
 336                 skb = skb_share_check(skb, GFP_ATOMIC);
 337                 if (!skb)
 338                         goto out;
 339
 340                 *pskb = skb;
 341         }
 342
 343         if (local) {
 344                 skb->pkt_type = PACKET_HOST;
 345                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
 346                         success = true;
 347         } else {
 348                 skb->dev = dev;
 349                 ret = RX_HANDLER_ANOTHER;
 350                 success = true;
 351         }
 352
 353 out:
 354         ipvlan_count_rx(ipvlan, len, success, false);
 355         return ret;
 356 }
 357
 358 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
 359                                             void *lyr3h, int addr_type,
 360                                             bool use_dest)
 361 {
 362         struct ipvl_addr *addr = NULL;
 363
 364         switch (addr_type) {
 365 #if IS_ENABLED(CONFIG_IPV6)
 366         case IPVL_IPV6: {
 367                 struct ipv6hdr *ip6h;
 368                 struct in6_addr *i6addr;
 369
 370                 ip6h = (struct ipv6hdr *)lyr3h;
 371                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
 372                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 373                 break;
 374         }
 375         case IPVL_ICMPV6: {
 376                 struct nd_msg *ndmh;
 377                 struct in6_addr *i6addr;
 378
 379                 /* Make sure that the NeighborSolicitation ICMPv6 packets
 380                  * are handled to avoid DAD issue.
 381                  */
 382                 ndmh = (struct nd_msg *)lyr3h;
 383                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 384                         i6addr = &ndmh->target;
 385                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 386                 }
 387                 break;
 388         }
 389 #endif
 390         case IPVL_IPV4: {
 391                 struct iphdr *ip4h;
 392                 __be32 *i4addr;
 393
 394                 ip4h = (struct iphdr *)lyr3h;
 395                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
 396                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
 397                 break;
 398         }
 399         case IPVL_ARP: {
 400                 struct arphdr *arph;
 401                 unsigned char *arp_ptr;
 402                 __be32 dip;
 403
 404                 arph = (struct arphdr *)lyr3h;
 405                 arp_ptr = (unsigned char *)(arph + 1);
 406                 if (use_dest)
 407                         arp_ptr += (2 * port->dev->addr_len) + 4;
 408                 else
 409                         arp_ptr += port->dev->addr_len;
 410
 411                 memcpy(&dip, arp_ptr, 4);
 412                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
 413                 break;
 414         }
 415         }
 416
 417         return addr;
 418 }
 419
 420 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
 421 {
 422         const struct iphdr *ip4h = ip_hdr(skb);
 423         struct net_device *dev = skb->dev;
 424         struct net *net = dev_net(dev);
 425         struct rtable *rt;
 426         int err, ret = NET_XMIT_DROP;
 427         struct flowi4 fl4 = {
 428                 .flowi4_oif = dev->ifindex,
 429                 .flowi4_tos = RT_TOS(ip4h->tos),
 430                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
 431                 .flowi4_mark = skb->mark,
 432                 .daddr = ip4h->daddr,
 433                 .saddr = ip4h->saddr,
 434         };
 435
 436         rt = ip_route_output_flow(net, &fl4, NULL);
 437         if (IS_ERR(rt))
 438                 goto err;
 439
 440         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
 441                 ip_rt_put(rt);
 442                 goto err;
 443         }
 444         skb_dst_set(skb, &rt->dst);
 445         err = ip_local_out(net, skb->sk, skb);
 446         if (unlikely(net_xmit_eval(err)))
 447                 dev->stats.tx_errors++;
 448         else
 449                 ret = NET_XMIT_SUCCESS;
 450         goto out;
 451 err:
 452         dev->stats.tx_errors++;
 453         kfree_skb(skb);
 454 out:
 455         return ret;
 456 }
 457
 458 #if IS_ENABLED(CONFIG_IPV6)
 459 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 460 {
 461         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
 462         struct net_device *dev = skb->dev;
 463         struct net *net = dev_net(dev);
 464         struct dst_entry *dst;
 465         int err, ret = NET_XMIT_DROP;
 466         struct flowi6 fl6 = {
 467                 .flowi6_oif = dev->ifindex,
 468                 .daddr = ip6h->daddr,
 469                 .saddr = ip6h->saddr,
 470                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
 471                 .flowlabel = ip6_flowinfo(ip6h),
 472                 .flowi6_mark = skb->mark,
 473                 .flowi6_proto = ip6h->nexthdr,
 474         };
 475
 476         dst = ip6_route_output(net, NULL, &fl6);
 477         if (dst->error) {
 478                 ret = dst->error;
 479                 dst_release(dst);
 480                 goto err;
 481         }
 482         skb_dst_set(skb, dst);
 483         err = ip6_local_out(net, skb->sk, skb);
 484         if (unlikely(net_xmit_eval(err)))
 485                 dev->stats.tx_errors++;
 486         else
 487                 ret = NET_XMIT_SUCCESS;
 488         goto out;
 489 err:
 490         dev->stats.tx_errors++;
 491         kfree_skb(skb);
 492 out:
 493         return ret;
 494 }
 495 #else
 496 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 497 {
 498         return NET_XMIT_DROP;
 499 }
 500 #endif
 501
 502 static int ipvlan_process_outbound(struct sk_buff *skb)
 503 {
 504         struct ethhdr *ethh = eth_hdr(skb);
 505         int ret = NET_XMIT_DROP;
 506
 507         /* In this mode we dont care about multicast and broadcast traffic */
 508         if (is_multicast_ether_addr(ethh->h_dest)) {
 509                 pr_debug_ratelimited("Dropped {multi|broad}cast of type=[%x]\n",
 510                                      ntohs(skb->protocol));
 511                 kfree_skb(skb);
 512                 goto out;
 513         }
 514
 515         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
 516          * will have L2; which need to discarded and processed further
 517          * in the net-ns of the main-device.
 518          */
 519         if (skb_mac_header_was_set(skb)) {
 520                 skb_pull(skb, sizeof(*ethh));
 521                 skb->mac_header = (typeof(skb->mac_header))~0U;
 522                 skb_reset_network_header(skb);
 523         }
 524
 525         if (skb->protocol == htons(ETH_P_IPV6))
 526                 ret = ipvlan_process_v6_outbound(skb);
 527         else if (skb->protocol == htons(ETH_P_IP))
 528                 ret = ipvlan_process_v4_outbound(skb);
 529         else {
 530                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
 531                                     ntohs(skb->protocol));
 532                 kfree_skb(skb);
 533         }
 534 out:
 535         return ret;
 536 }
 537
 538 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
 539                                      struct sk_buff *skb, bool tx_pkt)
 540 {
 541         if (skb->protocol == htons(ETH_P_PAUSE)) {
 542                 kfree_skb(skb);
 543                 return;
 544         }
 545
 546         /* Record that the deferred packet is from TX or RX path. By
 547          * looking at mac-addresses on packet will lead to erronus decisions.
 548          * (This would be true for a loopback-mode on master device or a
 549          * hair-pin mode of the switch.)
 550          */
 551         IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
 552
 553         spin_lock(&port->backlog.lock);
 554         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
 555                 if (skb->dev)
 556                         dev_hold(skb->dev);
 557                 __skb_queue_tail(&port->backlog, skb);
 558                 spin_unlock(&port->backlog.lock);
 559                 schedule_work(&port->wq);
 560         } else {
 561                 spin_unlock(&port->backlog.lock);
 562                 atomic_long_inc(&skb->dev->rx_dropped);
 563                 kfree_skb(skb);
 564         }
 565 }
 566
 567 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
 568 {
 569         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 570         void *lyr3h;
 571         struct ipvl_addr *addr;
 572         int addr_type;
 573
 574         lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
 575         if (!lyr3h)
 576                 goto out;
 577
 578         if (!ipvlan_is_vepa(ipvlan->port)) {
 579                 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 580                 if (addr) {
 581                         if (ipvlan_is_private(ipvlan->port)) {
 582                                 consume_skb(skb);
 583                                 return NET_XMIT_DROP;
 584                         }
 585                         return ipvlan_rcv_frame(addr, &skb, true);
 586                 }
 587         }
 588 out:
 589         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
 590         return ipvlan_process_outbound(skb);
 591 }
 592
 593 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
 594 {
 595         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 596         struct ethhdr *eth = eth_hdr(skb);
 597         struct ipvl_addr *addr;
 598         void *lyr3h;
 599         int addr_type;
 600
 601         if (!ipvlan_is_vepa(ipvlan->port) &&
 602             ether_addr_equal(eth->h_dest, eth->h_source)) {
 603                 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
 604                 if (lyr3h) {
 605                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 606                         if (addr) {
 607                                 if (ipvlan_is_private(ipvlan->port)) {
 608                                         consume_skb(skb);
 609                                         return NET_XMIT_DROP;
 610                                 }
 611                                 return ipvlan_rcv_frame(addr, &skb, true);
 612                         }
 613                 }
 614                 skb = skb_share_check(skb, GFP_ATOMIC);
 615                 if (!skb)
 616                         return NET_XMIT_DROP;
 617
 618                 /* Packet definitely does not belong to any of the
 619                  * virtual devices, but the dest is local. So forward
 620                  * the skb for the main-dev. At the RX side we just return
 621                  * RX_PASS for it to be processed further on the stack.
 622                  */
 623                 return dev_forward_skb(ipvlan->phy_dev, skb);
 624
 625         } else if (is_multicast_ether_addr(eth->h_dest)) {
 626                 ipvlan_skb_crossing_ns(skb, NULL);
 627                 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
 628                 return NET_XMIT_SUCCESS;
 629         }
 630
 631         skb->dev = ipvlan->phy_dev;
 632         return dev_queue_xmit(skb);
 633 }
 634
 635 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 636 {
 637         struct ipvl_dev *ipvlan = netdev_priv(dev);
 638         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
 639
 640         if (!port)
 641                 goto out;
 642
 643         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
 644                 goto out;
 645
 646         switch(port->mode) {
 647         case IPVLAN_MODE_L2:
 648                 return ipvlan_xmit_mode_l2(skb, dev);
 649         case IPVLAN_MODE_L3:
 650         case IPVLAN_MODE_L3S:
 651                 return ipvlan_xmit_mode_l3(skb, dev);
 652         }
 653
 654         /* Should not reach here */
 655         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
 656                           port->mode);
 657 out:
 658         kfree_skb(skb);
 659         return NET_XMIT_DROP;
 660 }
 661
 662 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
 663 {
 664         struct ethhdr *eth = eth_hdr(skb);
 665         struct ipvl_addr *addr;
 666         void *lyr3h;
 667         int addr_type;
 668
 669         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
 670                 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
 671                 if (!lyr3h)
 672                         return true;
 673
 674                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
 675                 if (addr)
 676                         return false;
 677         }
 678
 679         return true;
 680 }
 681
 682 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
 683                                                  struct ipvl_port *port)
 684 {
 685         void *lyr3h;
 686         int addr_type;
 687         struct ipvl_addr *addr;
 688         struct sk_buff *skb = *pskb;
 689         rx_handler_result_t ret = RX_HANDLER_PASS;
 690
 691         lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
 692         if (!lyr3h)
 693                 goto out;
 694
 695         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 696         if (addr)
 697                 ret = ipvlan_rcv_frame(addr, pskb, false);
 698
 699 out:
 700         return ret;
 701 }
 702
 703 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
 704                                                  struct ipvl_port *port)
 705 {
 706         struct sk_buff *skb = *pskb;
 707         struct ethhdr *eth = eth_hdr(skb);
 708         rx_handler_result_t ret = RX_HANDLER_PASS;
 709
 710         if (is_multicast_ether_addr(eth->h_dest)) {
 711                 if (ipvlan_external_frame(skb, port)) {
 712                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 713
 714                         /* External frames are queued for device local
 715                          * distribution, but a copy is given to master
 716                          * straight away to avoid sending duplicates later
 717                          * when work-queue processes this frame. This is
 718                          * achieved by returning RX_HANDLER_PASS.
 719                          */
 720                         if (nskb) {
 721                                 ipvlan_skb_crossing_ns(nskb, NULL);
 722                                 ipvlan_multicast_enqueue(port, nskb, false);
 723                         }
 724                 }
 725         } else {
 726                 /* Perform like l3 mode for non-multicast packet */
 727                 ret = ipvlan_handle_mode_l3(pskb, port);
 728         }
 729
 730         return ret;
 731 }
 732
 733 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
 734 {
 735         struct sk_buff *skb = *pskb;
 736         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
 737
 738         if (!port)
 739                 return RX_HANDLER_PASS;
 740
 741         switch (port->mode) {
 742         case IPVLAN_MODE_L2:
 743                 return ipvlan_handle_mode_l2(pskb, port);
 744         case IPVLAN_MODE_L3:
 745                 return ipvlan_handle_mode_l3(pskb, port);
 746         case IPVLAN_MODE_L3S:
 747                 return RX_HANDLER_PASS;
 748         }
 749
 750         /* Should not reach here */
 751         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
 752                           port->mode);
 753         kfree_skb(skb);
 754         return RX_HANDLER_CONSUMED;
 755 }
 756
 757 static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
 758                                             struct net_device *dev)
 759 {
 760         struct ipvl_addr *addr = NULL;
 761         struct ipvl_port *port;
 762         void *lyr3h;
 763         int addr_type;
 764
 765         if (!dev || !netif_is_ipvlan_port(dev))
 766                 goto out;
 767
 768         port = ipvlan_port_get_rcu(dev);
 769         if (!port || port->mode != IPVLAN_MODE_L3S)
 770                 goto out;
 771
 772         lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
 773         if (!lyr3h)
 774                 goto out;
 775
 776         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 777 out:
 778         return addr;
 779 }
 780
 781 struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
 782                               u16 proto)
 783 {
 784         struct ipvl_addr *addr;
 785         struct net_device *sdev;
 786
 787         addr = ipvlan_skb_to_addr(skb, dev);
 788         if (!addr)
 789                 goto out;
 790
 791         sdev = addr->master->dev;
 792         switch (proto) {
 793         case AF_INET:
 794         {
 795                 int err;
 796                 struct iphdr *ip4h = ip_hdr(skb);
 797
 798                 err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
 799                                            ip4h->tos, sdev);
 800                 if (unlikely(err))
 801                         goto out;
 802                 break;
 803         }
 804 #if IS_ENABLED(CONFIG_IPV6)
 805         case AF_INET6:
 806         {
 807                 struct dst_entry *dst;
 808                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 809                 int flags = RT6_LOOKUP_F_HAS_SADDR;
 810                 struct flowi6 fl6 = {
 811                         .flowi6_iif   = sdev->ifindex,
 812                         .daddr        = ip6h->daddr,
 813                         .saddr        = ip6h->saddr,
 814                         .flowlabel    = ip6_flowinfo(ip6h),
 815                         .flowi6_mark  = skb->mark,
 816                         .flowi6_proto = ip6h->nexthdr,
 817                 };
 818
 819                 skb_dst_drop(skb);
 820                 dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6,
 821                                              skb, flags);
 822                 skb_dst_set(skb, dst);
 823                 break;
 824         }
 825 #endif
 826         default:
 827                 break;
 828         }
 829
 830 out:
 831         return skb;
 832 }
 833
 834 unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
 835                              const struct nf_hook_state *state)
 836 {
 837         struct ipvl_addr *addr;
 838         unsigned int len;
 839
 840         addr = ipvlan_skb_to_addr(skb, skb->dev);
 841         if (!addr)
 842                 goto out;
 843
 844         skb->dev = addr->master->dev;
 845         len = skb->len + ETH_HLEN;
 846         ipvlan_count_rx(addr->master, len, true, false);
 847 out:
 848         return NF_ACCEPT;
 849 }