1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 3 */ 4 5 #include "ipvlan.h" 6 7 static u32 ipvlan_jhash_secret __read_mostly; 8 9 void ipvlan_init_secret(void) 10 { 11 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret)); 12 } 13 14 void ipvlan_count_rx(const struct ipvl_dev *ipvlan, 15 unsigned int len, bool success, bool mcast) 16 { 17 if (likely(success)) { 18 struct ipvl_pcpu_stats *pcptr; 19 20 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 21 u64_stats_update_begin(&pcptr->syncp); 22 pcptr->rx_pkts++; 23 pcptr->rx_bytes += len; 24 if (mcast) 25 pcptr->rx_mcast++; 26 u64_stats_update_end(&pcptr->syncp); 27 } else { 28 this_cpu_inc(ipvlan->pcpu_stats->rx_errs); 29 } 30 } 31 EXPORT_SYMBOL_GPL(ipvlan_count_rx); 32 33 #if IS_ENABLED(CONFIG_IPV6) 34 static u8 ipvlan_get_v6_hash(const void *iaddr) 35 { 36 const struct in6_addr *ip6_addr = iaddr; 37 38 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) & 39 IPVLAN_HASH_MASK; 40 } 41 #else 42 static u8 ipvlan_get_v6_hash(const void *iaddr) 43 { 44 return 0; 45 } 46 #endif 47 48 static u8 ipvlan_get_v4_hash(const void *iaddr) 49 { 50 const struct in_addr *ip4_addr = iaddr; 51 52 return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) & 53 IPVLAN_HASH_MASK; 54 } 55 56 static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr) 57 { 58 if (!is_v6 && addr->atype == IPVL_IPV4) { 59 struct in_addr *i4addr = (struct in_addr *)iaddr; 60 61 return addr->ip4addr.s_addr == i4addr->s_addr; 62 #if IS_ENABLED(CONFIG_IPV6) 63 } else if (is_v6 && addr->atype == IPVL_IPV6) { 64 struct in6_addr *i6addr = (struct in6_addr *)iaddr; 65 66 return ipv6_addr_equal(&addr->ip6addr, i6addr); 67 #endif 68 } 69 70 return false; 71 } 72 73 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port, 74 const void *iaddr, bool is_v6) 75 { 76 struct ipvl_addr *addr; 77 u8 hash; 78 79 hash = is_v6 ? ipvlan_get_v6_hash(iaddr) : 80 ipvlan_get_v4_hash(iaddr); 81 hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) 82 if (addr_equal(is_v6, addr, iaddr)) 83 return addr; 84 return NULL; 85 } 86 87 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr) 88 { 89 struct ipvl_port *port = ipvlan->port; 90 u8 hash; 91 92 hash = (addr->atype == IPVL_IPV6) ? 93 ipvlan_get_v6_hash(&addr->ip6addr) : 94 ipvlan_get_v4_hash(&addr->ip4addr); 95 if (hlist_unhashed(&addr->hlnode)) 96 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]); 97 } 98 99 void ipvlan_ht_addr_del(struct ipvl_addr *addr) 100 { 101 hlist_del_init_rcu(&addr->hlnode); 102 } 103 104 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, 105 const void *iaddr, bool is_v6) 106 { 107 struct ipvl_addr *addr, *ret = NULL; 108 109 rcu_read_lock(); 110 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) { 111 if (addr_equal(is_v6, addr, iaddr)) { 112 ret = addr; 113 break; 114 } 115 } 116 rcu_read_unlock(); 117 return ret; 118 } 119 120 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6) 121 { 122 struct ipvl_dev *ipvlan; 123 bool ret = false; 124 125 rcu_read_lock(); 126 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { 127 if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) { 128 ret = true; 129 break; 130 } 131 } 132 rcu_read_unlock(); 133 return ret; 134 } 135 136 void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type) 137 { 138 void *lyr3h = NULL; 139 140 switch (skb->protocol) { 141 case htons(ETH_P_ARP): { 142 struct arphdr *arph; 143 144 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev)))) 145 return NULL; 146 147 arph = arp_hdr(skb); 148 *type = IPVL_ARP; 149 lyr3h = arph; 150 break; 151 } 152 case htons(ETH_P_IP): { 153 u32 pktlen; 154 struct iphdr *ip4h; 155 156 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h)))) 157 return NULL; 158 159 ip4h = ip_hdr(skb); 160 pktlen = ntohs(ip4h->tot_len); 161 if (ip4h->ihl < 5 || ip4h->version != 4) 162 return NULL; 163 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4)) 164 return NULL; 165 166 *type = IPVL_IPV4; 167 lyr3h = ip4h; 168 break; 169 } 170 #if IS_ENABLED(CONFIG_IPV6) 171 case htons(ETH_P_IPV6): { 172 struct ipv6hdr *ip6h; 173 174 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h)))) 175 return NULL; 176 177 ip6h = ipv6_hdr(skb); 178 if (ip6h->version != 6) 179 return NULL; 180 181 *type = IPVL_IPV6; 182 lyr3h = ip6h; 183 /* Only Neighbour Solicitation pkts need different treatment */ 184 if (ipv6_addr_any(&ip6h->saddr) && 185 ip6h->nexthdr == NEXTHDR_ICMP) { 186 struct icmp6hdr *icmph; 187 188 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)))) 189 return NULL; 190 191 ip6h = ipv6_hdr(skb); 192 icmph = (struct icmp6hdr *)(ip6h + 1); 193 194 if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { 195 /* Need to access the ipv6 address in body */ 196 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph) 197 + sizeof(struct in6_addr)))) 198 return NULL; 199 200 ip6h = ipv6_hdr(skb); 201 icmph = (struct icmp6hdr *)(ip6h + 1); 202 } 203 204 *type = IPVL_ICMPV6; 205 lyr3h = icmph; 206 } 207 break; 208 } 209 #endif 210 default: 211 return NULL; 212 } 213 214 return lyr3h; 215 } 216 217 unsigned int ipvlan_mac_hash(const unsigned char *addr) 218 { 219 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2), 220 ipvlan_jhash_secret); 221 222 return hash & IPVLAN_MAC_FILTER_MASK; 223 } 224 225 void ipvlan_process_multicast(struct work_struct *work) 226 { 227 struct ipvl_port *port = container_of(work, struct ipvl_port, wq); 228 struct ethhdr *ethh; 229 struct ipvl_dev *ipvlan; 230 struct sk_buff *skb, *nskb; 231 struct sk_buff_head list; 232 unsigned int len; 233 unsigned int mac_hash; 234 int ret; 235 u8 pkt_type; 236 bool tx_pkt; 237 238 __skb_queue_head_init(&list); 239 240 spin_lock_bh(&port->backlog.lock); 241 skb_queue_splice_tail_init(&port->backlog, &list); 242 spin_unlock_bh(&port->backlog.lock); 243 244 while ((skb = __skb_dequeue(&list)) != NULL) { 245 struct net_device *dev = skb->dev; 246 bool consumed = false; 247 248 ethh = eth_hdr(skb); 249 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt; 250 mac_hash = ipvlan_mac_hash(ethh->h_dest); 251 252 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast)) 253 pkt_type = PACKET_BROADCAST; 254 else 255 pkt_type = PACKET_MULTICAST; 256 257 rcu_read_lock(); 258 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { 259 if (tx_pkt && (ipvlan->dev == skb->dev)) 260 continue; 261 if (!test_bit(mac_hash, ipvlan->mac_filters)) 262 continue; 263 if (!(ipvlan->dev->flags & IFF_UP)) 264 continue; 265 ret = NET_RX_DROP; 266 len = skb->len + ETH_HLEN; 267 nskb = skb_clone(skb, GFP_ATOMIC); 268 local_bh_disable(); 269 if (nskb) { 270 consumed = true; 271 nskb->pkt_type = pkt_type; 272 nskb->dev = ipvlan->dev; 273 if (tx_pkt) 274 ret = dev_forward_skb(ipvlan->dev, nskb); 275 else 276 ret = netif_rx(nskb); 277 } 278 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); 279 local_bh_enable(); 280 } 281 rcu_read_unlock(); 282 283 if (tx_pkt) { 284 /* If the packet originated here, send it out. */ 285 skb->dev = port->dev; 286 skb->pkt_type = pkt_type; 287 dev_queue_xmit(skb); 288 } else { 289 if (consumed) 290 consume_skb(skb); 291 else 292 kfree_skb(skb); 293 } 294 if (dev) 295 dev_put(dev); 296 cond_resched(); 297 } 298 } 299 300 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev) 301 { 302 bool xnet = true; 303 304 if (dev) 305 xnet = !net_eq(dev_net(skb->dev), dev_net(dev)); 306 307 skb_scrub_packet(skb, xnet); 308 if (dev) 309 skb->dev = dev; 310 } 311 312 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb, 313 bool local) 314 { 315 struct ipvl_dev *ipvlan = addr->master; 316 struct net_device *dev = ipvlan->dev; 317 unsigned int len; 318 rx_handler_result_t ret = RX_HANDLER_CONSUMED; 319 bool success = false; 320 struct sk_buff *skb = *pskb; 321 322 len = skb->len + ETH_HLEN; 323 /* Only packets exchanged between two local slaves need to have 324 * device-up check as well as skb-share check. 325 */ 326 if (local) { 327 if (unlikely(!(dev->flags & IFF_UP))) { 328 kfree_skb(skb); 329 goto out; 330 } 331 332 skb = skb_share_check(skb, GFP_ATOMIC); 333 if (!skb) 334 goto out; 335 336 *pskb = skb; 337 } 338 339 if (local) { 340 skb->pkt_type = PACKET_HOST; 341 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) 342 success = true; 343 } else { 344 skb->dev = dev; 345 ret = RX_HANDLER_ANOTHER; 346 success = true; 347 } 348 349 out: 350 ipvlan_count_rx(ipvlan, len, success, false); 351 return ret; 352 } 353 354 struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h, 355 int addr_type, bool use_dest) 356 { 357 struct ipvl_addr *addr = NULL; 358 359 switch (addr_type) { 360 #if IS_ENABLED(CONFIG_IPV6) 361 case IPVL_IPV6: { 362 struct ipv6hdr *ip6h; 363 struct in6_addr *i6addr; 364 365 ip6h = (struct ipv6hdr *)lyr3h; 366 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; 367 addr = ipvlan_ht_addr_lookup(port, i6addr, true); 368 break; 369 } 370 case IPVL_ICMPV6: { 371 struct nd_msg *ndmh; 372 struct in6_addr *i6addr; 373 374 /* Make sure that the NeighborSolicitation ICMPv6 packets 375 * are handled to avoid DAD issue. 376 */ 377 ndmh = (struct nd_msg *)lyr3h; 378 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { 379 i6addr = &ndmh->target; 380 addr = ipvlan_ht_addr_lookup(port, i6addr, true); 381 } 382 break; 383 } 384 #endif 385 case IPVL_IPV4: { 386 struct iphdr *ip4h; 387 __be32 *i4addr; 388 389 ip4h = (struct iphdr *)lyr3h; 390 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; 391 addr = ipvlan_ht_addr_lookup(port, i4addr, false); 392 break; 393 } 394 case IPVL_ARP: { 395 struct arphdr *arph; 396 unsigned char *arp_ptr; 397 __be32 dip; 398 399 arph = (struct arphdr *)lyr3h; 400 arp_ptr = (unsigned char *)(arph + 1); 401 if (use_dest) 402 arp_ptr += (2 * port->dev->addr_len) + 4; 403 else 404 arp_ptr += port->dev->addr_len; 405 406 memcpy(&dip, arp_ptr, 4); 407 addr = ipvlan_ht_addr_lookup(port, &dip, false); 408 break; 409 } 410 } 411 412 return addr; 413 } 414 415 static int ipvlan_process_v4_outbound(struct sk_buff *skb) 416 { 417 const struct iphdr *ip4h = ip_hdr(skb); 418 struct net_device *dev = skb->dev; 419 struct net *net = dev_net(dev); 420 struct rtable *rt; 421 int err, ret = NET_XMIT_DROP; 422 struct flowi4 fl4 = { 423 .flowi4_oif = dev->ifindex, 424 .flowi4_tos = RT_TOS(ip4h->tos), 425 .flowi4_flags = FLOWI_FLAG_ANYSRC, 426 .flowi4_mark = skb->mark, 427 .daddr = ip4h->daddr, 428 .saddr = ip4h->saddr, 429 }; 430 431 rt = ip_route_output_flow(net, &fl4, NULL); 432 if (IS_ERR(rt)) 433 goto err; 434 435 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 436 ip_rt_put(rt); 437 goto err; 438 } 439 skb_dst_set(skb, &rt->dst); 440 err = ip_local_out(net, skb->sk, skb); 441 if (unlikely(net_xmit_eval(err))) 442 dev->stats.tx_errors++; 443 else 444 ret = NET_XMIT_SUCCESS; 445 goto out; 446 err: 447 dev->stats.tx_errors++; 448 kfree_skb(skb); 449 out: 450 return ret; 451 } 452 453 #if IS_ENABLED(CONFIG_IPV6) 454 static int ipvlan_process_v6_outbound(struct sk_buff *skb) 455 { 456 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 457 struct net_device *dev = skb->dev; 458 struct net *net = dev_net(dev); 459 struct dst_entry *dst; 460 int err, ret = NET_XMIT_DROP; 461 struct flowi6 fl6 = { 462 .flowi6_oif = dev->ifindex, 463 .daddr = ip6h->daddr, 464 .saddr = ip6h->saddr, 465 .flowi6_flags = FLOWI_FLAG_ANYSRC, 466 .flowlabel = ip6_flowinfo(ip6h), 467 .flowi6_mark = skb->mark, 468 .flowi6_proto = ip6h->nexthdr, 469 }; 470 471 dst = ip6_route_output(net, NULL, &fl6); 472 if (dst->error) { 473 ret = dst->error; 474 dst_release(dst); 475 goto err; 476 } 477 skb_dst_set(skb, dst); 478 err = ip6_local_out(net, skb->sk, skb); 479 if (unlikely(net_xmit_eval(err))) 480 dev->stats.tx_errors++; 481 else 482 ret = NET_XMIT_SUCCESS; 483 goto out; 484 err: 485 dev->stats.tx_errors++; 486 kfree_skb(skb); 487 out: 488 return ret; 489 } 490 #else 491 static int ipvlan_process_v6_outbound(struct sk_buff *skb) 492 { 493 return NET_XMIT_DROP; 494 } 495 #endif 496 497 static int ipvlan_process_outbound(struct sk_buff *skb) 498 { 499 struct ethhdr *ethh = eth_hdr(skb); 500 int ret = NET_XMIT_DROP; 501 502 /* The ipvlan is a pseudo-L2 device, so the packets that we receive 503 * will have L2; which need to discarded and processed further 504 * in the net-ns of the main-device. 505 */ 506 if (skb_mac_header_was_set(skb)) { 507 /* In this mode we dont care about 508 * multicast and broadcast traffic */ 509 if (is_multicast_ether_addr(ethh->h_dest)) { 510 pr_debug_ratelimited( 511 "Dropped {multi|broad}cast of type=[%x]\n", 512 ntohs(skb->protocol)); 513 kfree_skb(skb); 514 goto out; 515 } 516 517 skb_pull(skb, sizeof(*ethh)); 518 skb->mac_header = (typeof(skb->mac_header))~0U; 519 skb_reset_network_header(skb); 520 } 521 522 if (skb->protocol == htons(ETH_P_IPV6)) 523 ret = ipvlan_process_v6_outbound(skb); 524 else if (skb->protocol == htons(ETH_P_IP)) 525 ret = ipvlan_process_v4_outbound(skb); 526 else { 527 pr_warn_ratelimited("Dropped outbound packet type=%x\n", 528 ntohs(skb->protocol)); 529 kfree_skb(skb); 530 } 531 out: 532 return ret; 533 } 534 535 static void ipvlan_multicast_enqueue(struct ipvl_port *port, 536 struct sk_buff *skb, bool tx_pkt) 537 { 538 if (skb->protocol == htons(ETH_P_PAUSE)) { 539 kfree_skb(skb); 540 return; 541 } 542 543 /* Record that the deferred packet is from TX or RX path. By 544 * looking at mac-addresses on packet will lead to erronus decisions. 545 * (This would be true for a loopback-mode on master device or a 546 * hair-pin mode of the switch.) 547 */ 548 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt; 549 550 spin_lock(&port->backlog.lock); 551 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) { 552 if (skb->dev) 553 dev_hold(skb->dev); 554 __skb_queue_tail(&port->backlog, skb); 555 spin_unlock(&port->backlog.lock); 556 schedule_work(&port->wq); 557 } else { 558 spin_unlock(&port->backlog.lock); 559 atomic_long_inc(&skb->dev->rx_dropped); 560 kfree_skb(skb); 561 } 562 } 563 564 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) 565 { 566 const struct ipvl_dev *ipvlan = netdev_priv(dev); 567 void *lyr3h; 568 struct ipvl_addr *addr; 569 int addr_type; 570 571 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type); 572 if (!lyr3h) 573 goto out; 574 575 if (!ipvlan_is_vepa(ipvlan->port)) { 576 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); 577 if (addr) { 578 if (ipvlan_is_private(ipvlan->port)) { 579 consume_skb(skb); 580 return NET_XMIT_DROP; 581 } 582 return ipvlan_rcv_frame(addr, &skb, true); 583 } 584 } 585 out: 586 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); 587 return ipvlan_process_outbound(skb); 588 } 589 590 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) 591 { 592 const struct ipvl_dev *ipvlan = netdev_priv(dev); 593 struct ethhdr *eth = eth_hdr(skb); 594 struct ipvl_addr *addr; 595 void *lyr3h; 596 int addr_type; 597 598 if (!ipvlan_is_vepa(ipvlan->port) && 599 ether_addr_equal(eth->h_dest, eth->h_source)) { 600 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type); 601 if (lyr3h) { 602 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); 603 if (addr) { 604 if (ipvlan_is_private(ipvlan->port)) { 605 consume_skb(skb); 606 return NET_XMIT_DROP; 607 } 608 return ipvlan_rcv_frame(addr, &skb, true); 609 } 610 } 611 skb = skb_share_check(skb, GFP_ATOMIC); 612 if (!skb) 613 return NET_XMIT_DROP; 614 615 /* Packet definitely does not belong to any of the 616 * virtual devices, but the dest is local. So forward 617 * the skb for the main-dev. At the RX side we just return 618 * RX_PASS for it to be processed further on the stack. 619 */ 620 return dev_forward_skb(ipvlan->phy_dev, skb); 621 622 } else if (is_multicast_ether_addr(eth->h_dest)) { 623 ipvlan_skb_crossing_ns(skb, NULL); 624 ipvlan_multicast_enqueue(ipvlan->port, skb, true); 625 return NET_XMIT_SUCCESS; 626 } 627 628 skb->dev = ipvlan->phy_dev; 629 return dev_queue_xmit(skb); 630 } 631 632 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 633 { 634 struct ipvl_dev *ipvlan = netdev_priv(dev); 635 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev); 636 637 if (!port) 638 goto out; 639 640 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) 641 goto out; 642 643 switch(port->mode) { 644 case IPVLAN_MODE_L2: 645 return ipvlan_xmit_mode_l2(skb, dev); 646 case IPVLAN_MODE_L3: 647 #ifdef CONFIG_IPVLAN_L3S 648 case IPVLAN_MODE_L3S: 649 #endif 650 return ipvlan_xmit_mode_l3(skb, dev); 651 } 652 653 /* Should not reach here */ 654 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", 655 port->mode); 656 out: 657 kfree_skb(skb); 658 return NET_XMIT_DROP; 659 } 660 661 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) 662 { 663 struct ethhdr *eth = eth_hdr(skb); 664 struct ipvl_addr *addr; 665 void *lyr3h; 666 int addr_type; 667 668 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { 669 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); 670 if (!lyr3h) 671 return true; 672 673 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); 674 if (addr) 675 return false; 676 } 677 678 return true; 679 } 680 681 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, 682 struct ipvl_port *port) 683 { 684 void *lyr3h; 685 int addr_type; 686 struct ipvl_addr *addr; 687 struct sk_buff *skb = *pskb; 688 rx_handler_result_t ret = RX_HANDLER_PASS; 689 690 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); 691 if (!lyr3h) 692 goto out; 693 694 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); 695 if (addr) 696 ret = ipvlan_rcv_frame(addr, pskb, false); 697 698 out: 699 return ret; 700 } 701 702 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, 703 struct ipvl_port *port) 704 { 705 struct sk_buff *skb = *pskb; 706 struct ethhdr *eth = eth_hdr(skb); 707 rx_handler_result_t ret = RX_HANDLER_PASS; 708 709 if (is_multicast_ether_addr(eth->h_dest)) { 710 if (ipvlan_external_frame(skb, port)) { 711 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); 712 713 /* External frames are queued for device local 714 * distribution, but a copy is given to master 715 * straight away to avoid sending duplicates later 716 * when work-queue processes this frame. This is 717 * achieved by returning RX_HANDLER_PASS. 718 */ 719 if (nskb) { 720 ipvlan_skb_crossing_ns(nskb, NULL); 721 ipvlan_multicast_enqueue(port, nskb, false); 722 } 723 } 724 } else { 725 /* Perform like l3 mode for non-multicast packet */ 726 ret = ipvlan_handle_mode_l3(pskb, port); 727 } 728 729 return ret; 730 } 731 732 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) 733 { 734 struct sk_buff *skb = *pskb; 735 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); 736 737 if (!port) 738 return RX_HANDLER_PASS; 739 740 switch (port->mode) { 741 case IPVLAN_MODE_L2: 742 return ipvlan_handle_mode_l2(pskb, port); 743 case IPVLAN_MODE_L3: 744 return ipvlan_handle_mode_l3(pskb, port); 745 #ifdef CONFIG_IPVLAN_L3S 746 case IPVLAN_MODE_L3S: 747 return RX_HANDLER_PASS; 748 #endif 749 } 750 751 /* Should not reach here */ 752 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", 753 port->mode); 754 kfree_skb(skb); 755 return RX_HANDLER_CONSUMED; 756 } 757