| 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 | static void ipvlan_multicast_frame(struct ipvl_port *port, struct sk_buff *skb, |
| 193 | const struct ipvl_dev *in_dev, bool local) |
| 194 | { |
| 195 | struct ethhdr *eth = eth_hdr(skb); |
| 196 | struct ipvl_dev *ipvlan; |
| 197 | struct sk_buff *nskb; |
| 198 | unsigned int len; |
| 199 | unsigned int mac_hash; |
| 200 | int ret; |
| 201 | |
| 202 | if (skb->protocol == htons(ETH_P_PAUSE)) |
| 203 | return; |
| 204 | |
| 205 | rcu_read_lock(); |
| 206 | list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { |
| 207 | if (local && (ipvlan == in_dev)) |
| 208 | continue; |
| 209 | |
| 210 | mac_hash = ipvlan_mac_hash(eth->h_dest); |
| 211 | if (!test_bit(mac_hash, ipvlan->mac_filters)) |
| 212 | continue; |
| 213 | |
| 214 | ret = NET_RX_DROP; |
| 215 | len = skb->len + ETH_HLEN; |
| 216 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 217 | if (!nskb) |
| 218 | goto mcast_acct; |
| 219 | |
| 220 | if (ether_addr_equal(eth->h_dest, ipvlan->phy_dev->broadcast)) |
| 221 | nskb->pkt_type = PACKET_BROADCAST; |
| 222 | else |
| 223 | nskb->pkt_type = PACKET_MULTICAST; |
| 224 | |
| 225 | nskb->dev = ipvlan->dev; |
| 226 | if (local) |
| 227 | ret = dev_forward_skb(ipvlan->dev, nskb); |
| 228 | else |
| 229 | ret = netif_rx(nskb); |
| 230 | mcast_acct: |
| 231 | ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); |
| 232 | } |
| 233 | rcu_read_unlock(); |
| 234 | |
| 235 | /* Locally generated? ...Forward a copy to the main-device as |
| 236 | * well. On the RX side we'll ignore it (wont give it to any |
| 237 | * of the virtual devices. |
| 238 | */ |
| 239 | if (local) { |
| 240 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 241 | if (nskb) { |
| 242 | if (ether_addr_equal(eth->h_dest, port->dev->broadcast)) |
| 243 | nskb->pkt_type = PACKET_BROADCAST; |
| 244 | else |
| 245 | nskb->pkt_type = PACKET_MULTICAST; |
| 246 | |
| 247 | dev_forward_skb(port->dev, nskb); |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb, |
| 253 | bool local) |
| 254 | { |
| 255 | struct ipvl_dev *ipvlan = addr->master; |
| 256 | struct net_device *dev = ipvlan->dev; |
| 257 | unsigned int len; |
| 258 | rx_handler_result_t ret = RX_HANDLER_CONSUMED; |
| 259 | bool success = false; |
| 260 | |
| 261 | len = skb->len + ETH_HLEN; |
| 262 | if (unlikely(!(dev->flags & IFF_UP))) { |
| 263 | kfree_skb(skb); |
| 264 | goto out; |
| 265 | } |
| 266 | |
| 267 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 268 | if (!skb) |
| 269 | goto out; |
| 270 | |
| 271 | skb->dev = dev; |
| 272 | skb->pkt_type = PACKET_HOST; |
| 273 | |
| 274 | if (local) { |
| 275 | if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) |
| 276 | success = true; |
| 277 | } else { |
| 278 | ret = RX_HANDLER_ANOTHER; |
| 279 | success = true; |
| 280 | } |
| 281 | |
| 282 | out: |
| 283 | ipvlan_count_rx(ipvlan, len, success, false); |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, |
| 288 | void *lyr3h, int addr_type, |
| 289 | bool use_dest) |
| 290 | { |
| 291 | struct ipvl_addr *addr = NULL; |
| 292 | |
| 293 | if (addr_type == IPVL_IPV6) { |
| 294 | struct ipv6hdr *ip6h; |
| 295 | struct in6_addr *i6addr; |
| 296 | |
| 297 | ip6h = (struct ipv6hdr *)lyr3h; |
| 298 | i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; |
| 299 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); |
| 300 | } else if (addr_type == IPVL_ICMPV6) { |
| 301 | struct nd_msg *ndmh; |
| 302 | struct in6_addr *i6addr; |
| 303 | |
| 304 | /* Make sure that the NeighborSolicitation ICMPv6 packets |
| 305 | * are handled to avoid DAD issue. |
| 306 | */ |
| 307 | ndmh = (struct nd_msg *)lyr3h; |
| 308 | if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { |
| 309 | i6addr = &ndmh->target; |
| 310 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); |
| 311 | } |
| 312 | } else if (addr_type == IPVL_IPV4) { |
| 313 | struct iphdr *ip4h; |
| 314 | __be32 *i4addr; |
| 315 | |
| 316 | ip4h = (struct iphdr *)lyr3h; |
| 317 | i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; |
| 318 | addr = ipvlan_ht_addr_lookup(port, i4addr, false); |
| 319 | } else if (addr_type == IPVL_ARP) { |
| 320 | struct arphdr *arph; |
| 321 | unsigned char *arp_ptr; |
| 322 | __be32 dip; |
| 323 | |
| 324 | arph = (struct arphdr *)lyr3h; |
| 325 | arp_ptr = (unsigned char *)(arph + 1); |
| 326 | if (use_dest) |
| 327 | arp_ptr += (2 * port->dev->addr_len) + 4; |
| 328 | else |
| 329 | arp_ptr += port->dev->addr_len; |
| 330 | |
| 331 | memcpy(&dip, arp_ptr, 4); |
| 332 | addr = ipvlan_ht_addr_lookup(port, &dip, false); |
| 333 | } |
| 334 | |
| 335 | return addr; |
| 336 | } |
| 337 | |
| 338 | static int ipvlan_process_v4_outbound(struct sk_buff *skb) |
| 339 | { |
| 340 | const struct iphdr *ip4h = ip_hdr(skb); |
| 341 | struct net_device *dev = skb->dev; |
| 342 | struct rtable *rt; |
| 343 | int err, ret = NET_XMIT_DROP; |
| 344 | struct flowi4 fl4 = { |
| 345 | .flowi4_oif = dev_get_iflink(dev), |
| 346 | .flowi4_tos = RT_TOS(ip4h->tos), |
| 347 | .flowi4_flags = FLOWI_FLAG_ANYSRC, |
| 348 | .daddr = ip4h->daddr, |
| 349 | .saddr = ip4h->saddr, |
| 350 | }; |
| 351 | |
| 352 | rt = ip_route_output_flow(dev_net(dev), &fl4, NULL); |
| 353 | if (IS_ERR(rt)) |
| 354 | goto err; |
| 355 | |
| 356 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
| 357 | ip_rt_put(rt); |
| 358 | goto err; |
| 359 | } |
| 360 | skb_dst_drop(skb); |
| 361 | skb_dst_set(skb, &rt->dst); |
| 362 | err = ip_local_out(skb); |
| 363 | if (unlikely(net_xmit_eval(err))) |
| 364 | dev->stats.tx_errors++; |
| 365 | else |
| 366 | ret = NET_XMIT_SUCCESS; |
| 367 | goto out; |
| 368 | err: |
| 369 | dev->stats.tx_errors++; |
| 370 | kfree_skb(skb); |
| 371 | out: |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | static int ipvlan_process_v6_outbound(struct sk_buff *skb) |
| 376 | { |
| 377 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| 378 | struct net_device *dev = skb->dev; |
| 379 | struct dst_entry *dst; |
| 380 | int err, ret = NET_XMIT_DROP; |
| 381 | struct flowi6 fl6 = { |
| 382 | .flowi6_iif = skb->dev->ifindex, |
| 383 | .daddr = ip6h->daddr, |
| 384 | .saddr = ip6h->saddr, |
| 385 | .flowi6_flags = FLOWI_FLAG_ANYSRC, |
| 386 | .flowlabel = ip6_flowinfo(ip6h), |
| 387 | .flowi6_mark = skb->mark, |
| 388 | .flowi6_proto = ip6h->nexthdr, |
| 389 | }; |
| 390 | |
| 391 | dst = ip6_route_output(dev_net(dev), NULL, &fl6); |
| 392 | if (dst->error) { |
| 393 | ret = dst->error; |
| 394 | dst_release(dst); |
| 395 | goto err; |
| 396 | } |
| 397 | skb_dst_drop(skb); |
| 398 | skb_dst_set(skb, dst); |
| 399 | err = ip6_local_out(skb); |
| 400 | if (unlikely(net_xmit_eval(err))) |
| 401 | dev->stats.tx_errors++; |
| 402 | else |
| 403 | ret = NET_XMIT_SUCCESS; |
| 404 | goto out; |
| 405 | err: |
| 406 | dev->stats.tx_errors++; |
| 407 | kfree_skb(skb); |
| 408 | out: |
| 409 | return ret; |
| 410 | } |
| 411 | |
| 412 | static int ipvlan_process_outbound(struct sk_buff *skb, |
| 413 | const struct ipvl_dev *ipvlan) |
| 414 | { |
| 415 | struct ethhdr *ethh = eth_hdr(skb); |
| 416 | int ret = NET_XMIT_DROP; |
| 417 | |
| 418 | /* In this mode we dont care about multicast and broadcast traffic */ |
| 419 | if (is_multicast_ether_addr(ethh->h_dest)) { |
| 420 | pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n", |
| 421 | ntohs(skb->protocol)); |
| 422 | kfree_skb(skb); |
| 423 | goto out; |
| 424 | } |
| 425 | |
| 426 | /* The ipvlan is a pseudo-L2 device, so the packets that we receive |
| 427 | * will have L2; which need to discarded and processed further |
| 428 | * in the net-ns of the main-device. |
| 429 | */ |
| 430 | if (skb_mac_header_was_set(skb)) { |
| 431 | skb_pull(skb, sizeof(*ethh)); |
| 432 | skb->mac_header = (typeof(skb->mac_header))~0U; |
| 433 | skb_reset_network_header(skb); |
| 434 | } |
| 435 | |
| 436 | if (skb->protocol == htons(ETH_P_IPV6)) |
| 437 | ret = ipvlan_process_v6_outbound(skb); |
| 438 | else if (skb->protocol == htons(ETH_P_IP)) |
| 439 | ret = ipvlan_process_v4_outbound(skb); |
| 440 | else { |
| 441 | pr_warn_ratelimited("Dropped outbound packet type=%x\n", |
| 442 | ntohs(skb->protocol)); |
| 443 | kfree_skb(skb); |
| 444 | } |
| 445 | out: |
| 446 | return ret; |
| 447 | } |
| 448 | |
| 449 | static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) |
| 450 | { |
| 451 | const struct ipvl_dev *ipvlan = netdev_priv(dev); |
| 452 | void *lyr3h; |
| 453 | struct ipvl_addr *addr; |
| 454 | int addr_type; |
| 455 | |
| 456 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| 457 | if (!lyr3h) |
| 458 | goto out; |
| 459 | |
| 460 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); |
| 461 | if (addr) |
| 462 | return ipvlan_rcv_frame(addr, skb, true); |
| 463 | |
| 464 | out: |
| 465 | skb->dev = ipvlan->phy_dev; |
| 466 | return ipvlan_process_outbound(skb, ipvlan); |
| 467 | } |
| 468 | |
| 469 | static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) |
| 470 | { |
| 471 | const struct ipvl_dev *ipvlan = netdev_priv(dev); |
| 472 | struct ethhdr *eth = eth_hdr(skb); |
| 473 | struct ipvl_addr *addr; |
| 474 | void *lyr3h; |
| 475 | int addr_type; |
| 476 | |
| 477 | if (ether_addr_equal(eth->h_dest, eth->h_source)) { |
| 478 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| 479 | if (lyr3h) { |
| 480 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); |
| 481 | if (addr) |
| 482 | return ipvlan_rcv_frame(addr, skb, true); |
| 483 | } |
| 484 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 485 | if (!skb) |
| 486 | return NET_XMIT_DROP; |
| 487 | |
| 488 | /* Packet definitely does not belong to any of the |
| 489 | * virtual devices, but the dest is local. So forward |
| 490 | * the skb for the main-dev. At the RX side we just return |
| 491 | * RX_PASS for it to be processed further on the stack. |
| 492 | */ |
| 493 | return dev_forward_skb(ipvlan->phy_dev, skb); |
| 494 | |
| 495 | } else if (is_multicast_ether_addr(eth->h_dest)) { |
| 496 | u8 ip_summed = skb->ip_summed; |
| 497 | |
| 498 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 499 | ipvlan_multicast_frame(ipvlan->port, skb, ipvlan, true); |
| 500 | skb->ip_summed = ip_summed; |
| 501 | } |
| 502 | |
| 503 | skb->dev = ipvlan->phy_dev; |
| 504 | return dev_queue_xmit(skb); |
| 505 | } |
| 506 | |
| 507 | int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) |
| 508 | { |
| 509 | struct ipvl_dev *ipvlan = netdev_priv(dev); |
| 510 | struct ipvl_port *port = ipvlan_port_get_rcu(ipvlan->phy_dev); |
| 511 | |
| 512 | if (!port) |
| 513 | goto out; |
| 514 | |
| 515 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) |
| 516 | goto out; |
| 517 | |
| 518 | switch(port->mode) { |
| 519 | case IPVLAN_MODE_L2: |
| 520 | return ipvlan_xmit_mode_l2(skb, dev); |
| 521 | case IPVLAN_MODE_L3: |
| 522 | return ipvlan_xmit_mode_l3(skb, dev); |
| 523 | } |
| 524 | |
| 525 | /* Should not reach here */ |
| 526 | WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", |
| 527 | port->mode); |
| 528 | out: |
| 529 | kfree_skb(skb); |
| 530 | return NET_XMIT_DROP; |
| 531 | } |
| 532 | |
| 533 | static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) |
| 534 | { |
| 535 | struct ethhdr *eth = eth_hdr(skb); |
| 536 | struct ipvl_addr *addr; |
| 537 | void *lyr3h; |
| 538 | int addr_type; |
| 539 | |
| 540 | if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { |
| 541 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| 542 | if (!lyr3h) |
| 543 | return true; |
| 544 | |
| 545 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); |
| 546 | if (addr) |
| 547 | return false; |
| 548 | } |
| 549 | |
| 550 | return true; |
| 551 | } |
| 552 | |
| 553 | static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, |
| 554 | struct ipvl_port *port) |
| 555 | { |
| 556 | void *lyr3h; |
| 557 | int addr_type; |
| 558 | struct ipvl_addr *addr; |
| 559 | struct sk_buff *skb = *pskb; |
| 560 | rx_handler_result_t ret = RX_HANDLER_PASS; |
| 561 | |
| 562 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| 563 | if (!lyr3h) |
| 564 | goto out; |
| 565 | |
| 566 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); |
| 567 | if (addr) |
| 568 | ret = ipvlan_rcv_frame(addr, skb, false); |
| 569 | |
| 570 | out: |
| 571 | return ret; |
| 572 | } |
| 573 | |
| 574 | static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, |
| 575 | struct ipvl_port *port) |
| 576 | { |
| 577 | struct sk_buff *skb = *pskb; |
| 578 | struct ethhdr *eth = eth_hdr(skb); |
| 579 | rx_handler_result_t ret = RX_HANDLER_PASS; |
| 580 | void *lyr3h; |
| 581 | int addr_type; |
| 582 | |
| 583 | if (is_multicast_ether_addr(eth->h_dest)) { |
| 584 | if (ipvlan_external_frame(skb, port)) |
| 585 | ipvlan_multicast_frame(port, skb, NULL, false); |
| 586 | } else { |
| 587 | struct ipvl_addr *addr; |
| 588 | |
| 589 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| 590 | if (!lyr3h) |
| 591 | return ret; |
| 592 | |
| 593 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); |
| 594 | if (addr) |
| 595 | ret = ipvlan_rcv_frame(addr, skb, false); |
| 596 | } |
| 597 | |
| 598 | return ret; |
| 599 | } |
| 600 | |
| 601 | rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) |
| 602 | { |
| 603 | struct sk_buff *skb = *pskb; |
| 604 | struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); |
| 605 | |
| 606 | if (!port) |
| 607 | return RX_HANDLER_PASS; |
| 608 | |
| 609 | switch (port->mode) { |
| 610 | case IPVLAN_MODE_L2: |
| 611 | return ipvlan_handle_mode_l2(pskb, port); |
| 612 | case IPVLAN_MODE_L3: |
| 613 | return ipvlan_handle_mode_l3(pskb, port); |
| 614 | } |
| 615 | |
| 616 | /* Should not reach here */ |
| 617 | WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", |
| 618 | port->mode); |
| 619 | kfree_skb(skb); |
| 620 | return NET_RX_DROP; |
| 621 | } |