1 // SPDX-License-Identifier: GPL-2.0 2 /* Bareudp: UDP tunnel encasulation for different Payload types like 3 * MPLS, NSH, IP, etc. 4 * Copyright (c) 2019 Nokia, Inc. 5 * Authors: Martin Varghese, <martin.varghese@nokia.com> 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/etherdevice.h> 13 #include <linux/hash.h> 14 #include <net/dst_metadata.h> 15 #include <net/gro_cells.h> 16 #include <net/rtnetlink.h> 17 #include <net/protocol.h> 18 #include <net/ip6_tunnel.h> 19 #include <net/ip_tunnels.h> 20 #include <net/udp_tunnel.h> 21 #include <net/bareudp.h> 22 23 #define BAREUDP_BASE_HLEN sizeof(struct udphdr) 24 #define BAREUDP_IPV4_HLEN (sizeof(struct iphdr) + \ 25 sizeof(struct udphdr)) 26 #define BAREUDP_IPV6_HLEN (sizeof(struct ipv6hdr) + \ 27 sizeof(struct udphdr)) 28 29 static bool log_ecn_error = true; 30 module_param(log_ecn_error, bool, 0644); 31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 32 33 /* per-network namespace private data for this module */ 34 35 static unsigned int bareudp_net_id; 36 37 struct bareudp_net { 38 struct list_head bareudp_list; 39 }; 40 41 /* Pseudo network device */ 42 struct bareudp_dev { 43 struct net *net; /* netns for packet i/o */ 44 struct net_device *dev; /* netdev for bareudp tunnel */ 45 __be16 ethertype; 46 __be16 port; 47 u16 sport_min; 48 bool multi_proto_mode; 49 struct socket __rcu *sock; 50 struct list_head next; /* bareudp node on namespace list */ 51 struct gro_cells gro_cells; 52 }; 53 54 static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 55 { 56 struct metadata_dst *tun_dst = NULL; 57 struct pcpu_sw_netstats *stats; 58 struct bareudp_dev *bareudp; 59 unsigned short family; 60 unsigned int len; 61 __be16 proto; 62 void *oiph; 63 int err; 64 65 bareudp = rcu_dereference_sk_user_data(sk); 66 if (!bareudp) 67 goto drop; 68 69 if (skb->protocol == htons(ETH_P_IP)) 70 family = AF_INET; 71 else 72 family = AF_INET6; 73 74 if (bareudp->ethertype == htons(ETH_P_IP)) { 75 struct iphdr *iphdr; 76 77 iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN); 78 if (iphdr->version == 4) { 79 proto = bareudp->ethertype; 80 } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) { 81 proto = htons(ETH_P_IPV6); 82 } else { 83 bareudp->dev->stats.rx_dropped++; 84 goto drop; 85 } 86 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { 87 struct iphdr *tunnel_hdr; 88 89 tunnel_hdr = (struct iphdr *)skb_network_header(skb); 90 if (tunnel_hdr->version == 4) { 91 if (!ipv4_is_multicast(tunnel_hdr->daddr)) { 92 proto = bareudp->ethertype; 93 } else if (bareudp->multi_proto_mode && 94 ipv4_is_multicast(tunnel_hdr->daddr)) { 95 proto = htons(ETH_P_MPLS_MC); 96 } else { 97 bareudp->dev->stats.rx_dropped++; 98 goto drop; 99 } 100 } else { 101 int addr_type; 102 struct ipv6hdr *tunnel_hdr_v6; 103 104 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); 105 addr_type = 106 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); 107 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 108 proto = bareudp->ethertype; 109 } else if (bareudp->multi_proto_mode && 110 (addr_type & IPV6_ADDR_MULTICAST)) { 111 proto = htons(ETH_P_MPLS_MC); 112 } else { 113 bareudp->dev->stats.rx_dropped++; 114 goto drop; 115 } 116 } 117 } else { 118 proto = bareudp->ethertype; 119 } 120 121 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, 122 proto, 123 !net_eq(bareudp->net, 124 dev_net(bareudp->dev)))) { 125 bareudp->dev->stats.rx_dropped++; 126 goto drop; 127 } 128 129 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0); 130 if (!tun_dst) { 131 bareudp->dev->stats.rx_dropped++; 132 goto drop; 133 } 134 skb_dst_set(skb, &tun_dst->dst); 135 skb->dev = bareudp->dev; 136 oiph = skb_network_header(skb); 137 skb_reset_network_header(skb); 138 139 if (family == AF_INET) 140 err = IP_ECN_decapsulate(oiph, skb); 141 #if IS_ENABLED(CONFIG_IPV6) 142 else 143 err = IP6_ECN_decapsulate(oiph, skb); 144 #endif 145 146 if (unlikely(err)) { 147 if (log_ecn_error) { 148 if (family == AF_INET) 149 net_info_ratelimited("non-ECT from %pI4 " 150 "with TOS=%#x\n", 151 &((struct iphdr *)oiph)->saddr, 152 ((struct iphdr *)oiph)->tos); 153 #if IS_ENABLED(CONFIG_IPV6) 154 else 155 net_info_ratelimited("non-ECT from %pI6\n", 156 &((struct ipv6hdr *)oiph)->saddr); 157 #endif 158 } 159 if (err > 1) { 160 ++bareudp->dev->stats.rx_frame_errors; 161 ++bareudp->dev->stats.rx_errors; 162 goto drop; 163 } 164 } 165 166 len = skb->len; 167 err = gro_cells_receive(&bareudp->gro_cells, skb); 168 if (likely(err == NET_RX_SUCCESS)) { 169 stats = this_cpu_ptr(bareudp->dev->tstats); 170 u64_stats_update_begin(&stats->syncp); 171 stats->rx_packets++; 172 stats->rx_bytes += len; 173 u64_stats_update_end(&stats->syncp); 174 } 175 return 0; 176 drop: 177 /* Consume bad packet */ 178 kfree_skb(skb); 179 180 return 0; 181 } 182 183 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 184 { 185 return 0; 186 } 187 188 static int bareudp_init(struct net_device *dev) 189 { 190 struct bareudp_dev *bareudp = netdev_priv(dev); 191 int err; 192 193 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 194 if (!dev->tstats) 195 return -ENOMEM; 196 197 err = gro_cells_init(&bareudp->gro_cells, dev); 198 if (err) { 199 free_percpu(dev->tstats); 200 return err; 201 } 202 return 0; 203 } 204 205 static void bareudp_uninit(struct net_device *dev) 206 { 207 struct bareudp_dev *bareudp = netdev_priv(dev); 208 209 gro_cells_destroy(&bareudp->gro_cells); 210 free_percpu(dev->tstats); 211 } 212 213 static struct socket *bareudp_create_sock(struct net *net, __be16 port) 214 { 215 struct udp_port_cfg udp_conf; 216 struct socket *sock; 217 int err; 218 219 memset(&udp_conf, 0, sizeof(udp_conf)); 220 #if IS_ENABLED(CONFIG_IPV6) 221 udp_conf.family = AF_INET6; 222 #else 223 udp_conf.family = AF_INET; 224 #endif 225 udp_conf.local_udp_port = port; 226 /* Open UDP socket */ 227 err = udp_sock_create(net, &udp_conf, &sock); 228 if (err < 0) 229 return ERR_PTR(err); 230 231 return sock; 232 } 233 234 /* Create new listen socket if needed */ 235 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 236 { 237 struct udp_tunnel_sock_cfg tunnel_cfg; 238 struct socket *sock; 239 240 sock = bareudp_create_sock(bareudp->net, port); 241 if (IS_ERR(sock)) 242 return PTR_ERR(sock); 243 244 /* Mark socket as an encapsulation socket */ 245 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 246 tunnel_cfg.sk_user_data = bareudp; 247 tunnel_cfg.encap_type = 1; 248 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 249 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 250 tunnel_cfg.encap_destroy = NULL; 251 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 252 253 if (sock->sk->sk_family == AF_INET6) 254 udp_encap_enable(); 255 256 rcu_assign_pointer(bareudp->sock, sock); 257 return 0; 258 } 259 260 static int bareudp_open(struct net_device *dev) 261 { 262 struct bareudp_dev *bareudp = netdev_priv(dev); 263 int ret = 0; 264 265 ret = bareudp_socket_create(bareudp, bareudp->port); 266 return ret; 267 } 268 269 static void bareudp_sock_release(struct bareudp_dev *bareudp) 270 { 271 struct socket *sock; 272 273 sock = bareudp->sock; 274 rcu_assign_pointer(bareudp->sock, NULL); 275 synchronize_net(); 276 udp_tunnel_sock_release(sock); 277 } 278 279 static int bareudp_stop(struct net_device *dev) 280 { 281 struct bareudp_dev *bareudp = netdev_priv(dev); 282 283 bareudp_sock_release(bareudp); 284 return 0; 285 } 286 287 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 288 struct bareudp_dev *bareudp, 289 const struct ip_tunnel_info *info) 290 { 291 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 292 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 293 struct socket *sock = rcu_dereference(bareudp->sock); 294 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 295 const struct ip_tunnel_key *key = &info->key; 296 struct rtable *rt; 297 __be16 sport, df; 298 int min_headroom; 299 __u8 tos, ttl; 300 __be32 saddr; 301 int err; 302 303 if (!sock) 304 return -ESHUTDOWN; 305 306 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, 307 IPPROTO_UDP, use_cache); 308 309 if (IS_ERR(rt)) 310 return PTR_ERR(rt); 311 312 skb_tunnel_check_pmtu(skb, &rt->dst, 313 BAREUDP_IPV4_HLEN + info->options_len); 314 315 sport = udp_flow_src_port(bareudp->net, skb, 316 bareudp->sport_min, USHRT_MAX, 317 true); 318 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 319 ttl = key->ttl; 320 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 321 skb_scrub_packet(skb, xnet); 322 323 err = -ENOSPC; 324 if (!skb_pull(skb, skb_network_offset(skb))) 325 goto free_dst; 326 327 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 328 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 329 330 err = skb_cow_head(skb, min_headroom); 331 if (unlikely(err)) 332 goto free_dst; 333 334 err = udp_tunnel_handle_offloads(skb, udp_sum); 335 if (err) 336 goto free_dst; 337 338 skb_set_inner_protocol(skb, bareudp->ethertype); 339 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 340 tos, ttl, df, sport, bareudp->port, 341 !net_eq(bareudp->net, dev_net(bareudp->dev)), 342 !(info->key.tun_flags & TUNNEL_CSUM)); 343 return 0; 344 345 free_dst: 346 dst_release(&rt->dst); 347 return err; 348 } 349 350 #if IS_ENABLED(CONFIG_IPV6) 351 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 352 struct bareudp_dev *bareudp, 353 const struct ip_tunnel_info *info) 354 { 355 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 356 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 357 struct socket *sock = rcu_dereference(bareudp->sock); 358 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 359 const struct ip_tunnel_key *key = &info->key; 360 struct dst_entry *dst = NULL; 361 struct in6_addr saddr, daddr; 362 int min_headroom; 363 __u8 prio, ttl; 364 __be16 sport; 365 int err; 366 367 if (!sock) 368 return -ESHUTDOWN; 369 370 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, 371 IPPROTO_UDP, use_cache); 372 if (IS_ERR(dst)) 373 return PTR_ERR(dst); 374 375 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len); 376 377 sport = udp_flow_src_port(bareudp->net, skb, 378 bareudp->sport_min, USHRT_MAX, 379 true); 380 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 381 ttl = key->ttl; 382 383 skb_scrub_packet(skb, xnet); 384 385 err = -ENOSPC; 386 if (!skb_pull(skb, skb_network_offset(skb))) 387 goto free_dst; 388 389 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 390 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 391 392 err = skb_cow_head(skb, min_headroom); 393 if (unlikely(err)) 394 goto free_dst; 395 396 err = udp_tunnel_handle_offloads(skb, udp_sum); 397 if (err) 398 goto free_dst; 399 400 daddr = info->key.u.ipv6.dst; 401 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 402 &saddr, &daddr, prio, ttl, 403 info->key.label, sport, bareudp->port, 404 !(info->key.tun_flags & TUNNEL_CSUM)); 405 return 0; 406 407 free_dst: 408 dst_release(dst); 409 return err; 410 } 411 #endif 412 413 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 414 { 415 struct bareudp_dev *bareudp = netdev_priv(dev); 416 struct ip_tunnel_info *info = NULL; 417 int err; 418 419 if (skb->protocol != bareudp->ethertype) { 420 if (!bareudp->multi_proto_mode || 421 (skb->protocol != htons(ETH_P_MPLS_MC) && 422 skb->protocol != htons(ETH_P_IPV6))) { 423 err = -EINVAL; 424 goto tx_error; 425 } 426 } 427 428 info = skb_tunnel_info(skb); 429 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 430 err = -EINVAL; 431 goto tx_error; 432 } 433 434 rcu_read_lock(); 435 #if IS_ENABLED(CONFIG_IPV6) 436 if (info->mode & IP_TUNNEL_INFO_IPV6) 437 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 438 else 439 #endif 440 err = bareudp_xmit_skb(skb, dev, bareudp, info); 441 442 rcu_read_unlock(); 443 444 if (likely(!err)) 445 return NETDEV_TX_OK; 446 tx_error: 447 dev_kfree_skb(skb); 448 449 if (err == -ELOOP) 450 dev->stats.collisions++; 451 else if (err == -ENETUNREACH) 452 dev->stats.tx_carrier_errors++; 453 454 dev->stats.tx_errors++; 455 return NETDEV_TX_OK; 456 } 457 458 static int bareudp_fill_metadata_dst(struct net_device *dev, 459 struct sk_buff *skb) 460 { 461 struct ip_tunnel_info *info = skb_tunnel_info(skb); 462 struct bareudp_dev *bareudp = netdev_priv(dev); 463 bool use_cache; 464 465 use_cache = ip_tunnel_dst_cache_usable(skb, info); 466 467 if (ip_tunnel_info_af(info) == AF_INET) { 468 struct rtable *rt; 469 __be32 saddr; 470 471 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, 472 info, IPPROTO_UDP, use_cache); 473 if (IS_ERR(rt)) 474 return PTR_ERR(rt); 475 476 ip_rt_put(rt); 477 info->key.u.ipv4.src = saddr; 478 #if IS_ENABLED(CONFIG_IPV6) 479 } else if (ip_tunnel_info_af(info) == AF_INET6) { 480 struct dst_entry *dst; 481 struct in6_addr saddr; 482 struct socket *sock = rcu_dereference(bareudp->sock); 483 484 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, 485 &saddr, info, IPPROTO_UDP, 486 use_cache); 487 if (IS_ERR(dst)) 488 return PTR_ERR(dst); 489 490 dst_release(dst); 491 info->key.u.ipv6.src = saddr; 492 #endif 493 } else { 494 return -EINVAL; 495 } 496 497 info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 498 bareudp->sport_min, 499 USHRT_MAX, true); 500 info->key.tp_dst = bareudp->port; 501 return 0; 502 } 503 504 static const struct net_device_ops bareudp_netdev_ops = { 505 .ndo_init = bareudp_init, 506 .ndo_uninit = bareudp_uninit, 507 .ndo_open = bareudp_open, 508 .ndo_stop = bareudp_stop, 509 .ndo_start_xmit = bareudp_xmit, 510 .ndo_get_stats64 = ip_tunnel_get_stats64, 511 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 512 }; 513 514 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 515 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 516 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 517 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 518 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 519 }; 520 521 /* Info for udev, that this is a virtual tunnel endpoint */ 522 static struct device_type bareudp_type = { 523 .name = "bareudp", 524 }; 525 526 /* Initialize the device structure. */ 527 static void bareudp_setup(struct net_device *dev) 528 { 529 dev->netdev_ops = &bareudp_netdev_ops; 530 dev->needs_free_netdev = true; 531 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 532 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 533 dev->features |= NETIF_F_RXCSUM; 534 dev->features |= NETIF_F_GSO_SOFTWARE; 535 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 536 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 537 dev->hard_header_len = 0; 538 dev->addr_len = 0; 539 dev->mtu = ETH_DATA_LEN; 540 dev->min_mtu = IPV4_MIN_MTU; 541 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 542 dev->type = ARPHRD_NONE; 543 netif_keep_dst(dev); 544 dev->priv_flags |= IFF_NO_QUEUE; 545 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 546 } 547 548 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 549 struct netlink_ext_ack *extack) 550 { 551 if (!data) { 552 NL_SET_ERR_MSG(extack, 553 "Not enough attributes provided to perform the operation"); 554 return -EINVAL; 555 } 556 return 0; 557 } 558 559 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf) 560 { 561 if (!data[IFLA_BAREUDP_PORT] || !data[IFLA_BAREUDP_ETHERTYPE]) 562 return -EINVAL; 563 564 if (data[IFLA_BAREUDP_PORT]) 565 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 566 567 if (data[IFLA_BAREUDP_ETHERTYPE]) 568 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 569 570 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 571 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 572 573 return 0; 574 } 575 576 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 577 const struct bareudp_conf *conf) 578 { 579 struct bareudp_dev *bareudp, *t = NULL; 580 581 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 582 if (conf->port == bareudp->port) 583 t = bareudp; 584 } 585 return t; 586 } 587 588 static int bareudp_configure(struct net *net, struct net_device *dev, 589 struct bareudp_conf *conf) 590 { 591 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 592 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 593 int err; 594 595 bareudp->net = net; 596 bareudp->dev = dev; 597 t = bareudp_find_dev(bn, conf); 598 if (t) 599 return -EBUSY; 600 601 if (conf->multi_proto_mode && 602 (conf->ethertype != htons(ETH_P_MPLS_UC) && 603 conf->ethertype != htons(ETH_P_IP))) 604 return -EINVAL; 605 606 bareudp->port = conf->port; 607 bareudp->ethertype = conf->ethertype; 608 bareudp->sport_min = conf->sport_min; 609 bareudp->multi_proto_mode = conf->multi_proto_mode; 610 err = register_netdevice(dev); 611 if (err) 612 return err; 613 614 list_add(&bareudp->next, &bn->bareudp_list); 615 return 0; 616 } 617 618 static int bareudp_link_config(struct net_device *dev, 619 struct nlattr *tb[]) 620 { 621 int err; 622 623 if (tb[IFLA_MTU]) { 624 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 625 if (err) 626 return err; 627 } 628 return 0; 629 } 630 631 static int bareudp_newlink(struct net *net, struct net_device *dev, 632 struct nlattr *tb[], struct nlattr *data[], 633 struct netlink_ext_ack *extack) 634 { 635 struct bareudp_conf conf; 636 int err; 637 638 err = bareudp2info(data, &conf); 639 if (err) 640 return err; 641 642 err = bareudp_configure(net, dev, &conf); 643 if (err) 644 return err; 645 646 err = bareudp_link_config(dev, tb); 647 if (err) 648 return err; 649 650 return 0; 651 } 652 653 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 654 { 655 struct bareudp_dev *bareudp = netdev_priv(dev); 656 657 list_del(&bareudp->next); 658 unregister_netdevice_queue(dev, head); 659 } 660 661 static size_t bareudp_get_size(const struct net_device *dev) 662 { 663 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 664 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 665 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 666 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 667 0; 668 } 669 670 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 671 { 672 struct bareudp_dev *bareudp = netdev_priv(dev); 673 674 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 675 goto nla_put_failure; 676 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 677 goto nla_put_failure; 678 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 679 goto nla_put_failure; 680 if (bareudp->multi_proto_mode && 681 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 682 goto nla_put_failure; 683 684 return 0; 685 686 nla_put_failure: 687 return -EMSGSIZE; 688 } 689 690 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 691 .kind = "bareudp", 692 .maxtype = IFLA_BAREUDP_MAX, 693 .policy = bareudp_policy, 694 .priv_size = sizeof(struct bareudp_dev), 695 .setup = bareudp_setup, 696 .validate = bareudp_validate, 697 .newlink = bareudp_newlink, 698 .dellink = bareudp_dellink, 699 .get_size = bareudp_get_size, 700 .fill_info = bareudp_fill_info, 701 }; 702 703 struct net_device *bareudp_dev_create(struct net *net, const char *name, 704 u8 name_assign_type, 705 struct bareudp_conf *conf) 706 { 707 struct nlattr *tb[IFLA_MAX + 1]; 708 struct net_device *dev; 709 LIST_HEAD(list_kill); 710 int err; 711 712 memset(tb, 0, sizeof(tb)); 713 dev = rtnl_create_link(net, name, name_assign_type, 714 &bareudp_link_ops, tb, NULL); 715 if (IS_ERR(dev)) 716 return dev; 717 718 err = bareudp_configure(net, dev, conf); 719 if (err) { 720 free_netdev(dev); 721 return ERR_PTR(err); 722 } 723 err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN); 724 if (err) 725 goto err; 726 727 err = rtnl_configure_link(dev, NULL); 728 if (err < 0) 729 goto err; 730 731 return dev; 732 err: 733 bareudp_dellink(dev, &list_kill); 734 unregister_netdevice_many(&list_kill); 735 return ERR_PTR(err); 736 } 737 EXPORT_SYMBOL_GPL(bareudp_dev_create); 738 739 static __net_init int bareudp_init_net(struct net *net) 740 { 741 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 742 743 INIT_LIST_HEAD(&bn->bareudp_list); 744 return 0; 745 } 746 747 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 748 { 749 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 750 struct bareudp_dev *bareudp, *next; 751 752 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 753 unregister_netdevice_queue(bareudp->dev, head); 754 } 755 756 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 757 { 758 struct net *net; 759 LIST_HEAD(list); 760 761 rtnl_lock(); 762 list_for_each_entry(net, net_list, exit_list) 763 bareudp_destroy_tunnels(net, &list); 764 765 /* unregister the devices gathered above */ 766 unregister_netdevice_many(&list); 767 rtnl_unlock(); 768 } 769 770 static struct pernet_operations bareudp_net_ops = { 771 .init = bareudp_init_net, 772 .exit_batch = bareudp_exit_batch_net, 773 .id = &bareudp_net_id, 774 .size = sizeof(struct bareudp_net), 775 }; 776 777 static int __init bareudp_init_module(void) 778 { 779 int rc; 780 781 rc = register_pernet_subsys(&bareudp_net_ops); 782 if (rc) 783 goto out1; 784 785 rc = rtnl_link_register(&bareudp_link_ops); 786 if (rc) 787 goto out2; 788 789 return 0; 790 out2: 791 unregister_pernet_subsys(&bareudp_net_ops); 792 out1: 793 return rc; 794 } 795 late_initcall(bareudp_init_module); 796 797 static void __exit bareudp_cleanup_module(void) 798 { 799 rtnl_link_unregister(&bareudp_link_ops); 800 unregister_pernet_subsys(&bareudp_net_ops); 801 } 802 module_exit(bareudp_cleanup_module); 803 804 MODULE_LICENSE("GPL"); 805 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 806 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 807