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 bareudp_dev *bareudp; 58 unsigned short family; 59 unsigned int len; 60 __be16 proto; 61 void *oiph; 62 int err; 63 64 bareudp = rcu_dereference_sk_user_data(sk); 65 if (!bareudp) 66 goto drop; 67 68 if (skb->protocol == htons(ETH_P_IP)) 69 family = AF_INET; 70 else 71 family = AF_INET6; 72 73 if (bareudp->ethertype == htons(ETH_P_IP)) { 74 struct iphdr *iphdr; 75 76 iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN); 77 if (iphdr->version == 4) { 78 proto = bareudp->ethertype; 79 } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) { 80 proto = htons(ETH_P_IPV6); 81 } else { 82 bareudp->dev->stats.rx_dropped++; 83 goto drop; 84 } 85 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { 86 struct iphdr *tunnel_hdr; 87 88 tunnel_hdr = (struct iphdr *)skb_network_header(skb); 89 if (tunnel_hdr->version == 4) { 90 if (!ipv4_is_multicast(tunnel_hdr->daddr)) { 91 proto = bareudp->ethertype; 92 } else if (bareudp->multi_proto_mode && 93 ipv4_is_multicast(tunnel_hdr->daddr)) { 94 proto = htons(ETH_P_MPLS_MC); 95 } else { 96 bareudp->dev->stats.rx_dropped++; 97 goto drop; 98 } 99 } else { 100 int addr_type; 101 struct ipv6hdr *tunnel_hdr_v6; 102 103 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); 104 addr_type = 105 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); 106 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 107 proto = bareudp->ethertype; 108 } else if (bareudp->multi_proto_mode && 109 (addr_type & IPV6_ADDR_MULTICAST)) { 110 proto = htons(ETH_P_MPLS_MC); 111 } else { 112 bareudp->dev->stats.rx_dropped++; 113 goto drop; 114 } 115 } 116 } else { 117 proto = bareudp->ethertype; 118 } 119 120 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, 121 proto, 122 !net_eq(bareudp->net, 123 dev_net(bareudp->dev)))) { 124 bareudp->dev->stats.rx_dropped++; 125 goto drop; 126 } 127 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0); 128 if (!tun_dst) { 129 bareudp->dev->stats.rx_dropped++; 130 goto drop; 131 } 132 skb_dst_set(skb, &tun_dst->dst); 133 skb->dev = bareudp->dev; 134 oiph = skb_network_header(skb); 135 skb_reset_network_header(skb); 136 137 if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) 138 err = IP_ECN_decapsulate(oiph, skb); 139 else 140 err = IP6_ECN_decapsulate(oiph, skb); 141 142 if (unlikely(err)) { 143 if (log_ecn_error) { 144 if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) 145 net_info_ratelimited("non-ECT from %pI4 " 146 "with TOS=%#x\n", 147 &((struct iphdr *)oiph)->saddr, 148 ((struct iphdr *)oiph)->tos); 149 else 150 net_info_ratelimited("non-ECT from %pI6\n", 151 &((struct ipv6hdr *)oiph)->saddr); 152 } 153 if (err > 1) { 154 ++bareudp->dev->stats.rx_frame_errors; 155 ++bareudp->dev->stats.rx_errors; 156 goto drop; 157 } 158 } 159 160 len = skb->len; 161 err = gro_cells_receive(&bareudp->gro_cells, skb); 162 if (likely(err == NET_RX_SUCCESS)) 163 dev_sw_netstats_rx_add(bareudp->dev, len); 164 165 return 0; 166 drop: 167 /* Consume bad packet */ 168 kfree_skb(skb); 169 170 return 0; 171 } 172 173 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 174 { 175 return 0; 176 } 177 178 static int bareudp_init(struct net_device *dev) 179 { 180 struct bareudp_dev *bareudp = netdev_priv(dev); 181 int err; 182 183 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 184 if (!dev->tstats) 185 return -ENOMEM; 186 187 err = gro_cells_init(&bareudp->gro_cells, dev); 188 if (err) { 189 free_percpu(dev->tstats); 190 return err; 191 } 192 return 0; 193 } 194 195 static void bareudp_uninit(struct net_device *dev) 196 { 197 struct bareudp_dev *bareudp = netdev_priv(dev); 198 199 gro_cells_destroy(&bareudp->gro_cells); 200 free_percpu(dev->tstats); 201 } 202 203 static struct socket *bareudp_create_sock(struct net *net, __be16 port) 204 { 205 struct udp_port_cfg udp_conf; 206 struct socket *sock; 207 int err; 208 209 memset(&udp_conf, 0, sizeof(udp_conf)); 210 #if IS_ENABLED(CONFIG_IPV6) 211 udp_conf.family = AF_INET6; 212 #else 213 udp_conf.family = AF_INET; 214 #endif 215 udp_conf.local_udp_port = port; 216 /* Open UDP socket */ 217 err = udp_sock_create(net, &udp_conf, &sock); 218 if (err < 0) 219 return ERR_PTR(err); 220 221 udp_allow_gso(sock->sk); 222 return sock; 223 } 224 225 /* Create new listen socket if needed */ 226 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 227 { 228 struct udp_tunnel_sock_cfg tunnel_cfg; 229 struct socket *sock; 230 231 sock = bareudp_create_sock(bareudp->net, port); 232 if (IS_ERR(sock)) 233 return PTR_ERR(sock); 234 235 /* Mark socket as an encapsulation socket */ 236 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 237 tunnel_cfg.sk_user_data = bareudp; 238 tunnel_cfg.encap_type = 1; 239 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 240 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 241 tunnel_cfg.encap_destroy = NULL; 242 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 243 244 rcu_assign_pointer(bareudp->sock, sock); 245 return 0; 246 } 247 248 static int bareudp_open(struct net_device *dev) 249 { 250 struct bareudp_dev *bareudp = netdev_priv(dev); 251 int ret = 0; 252 253 ret = bareudp_socket_create(bareudp, bareudp->port); 254 return ret; 255 } 256 257 static void bareudp_sock_release(struct bareudp_dev *bareudp) 258 { 259 struct socket *sock; 260 261 sock = bareudp->sock; 262 rcu_assign_pointer(bareudp->sock, NULL); 263 synchronize_net(); 264 udp_tunnel_sock_release(sock); 265 } 266 267 static int bareudp_stop(struct net_device *dev) 268 { 269 struct bareudp_dev *bareudp = netdev_priv(dev); 270 271 bareudp_sock_release(bareudp); 272 return 0; 273 } 274 275 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 276 struct bareudp_dev *bareudp, 277 const struct ip_tunnel_info *info) 278 { 279 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 280 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 281 struct socket *sock = rcu_dereference(bareudp->sock); 282 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 283 const struct ip_tunnel_key *key = &info->key; 284 struct rtable *rt; 285 __be16 sport, df; 286 int min_headroom; 287 __u8 tos, ttl; 288 __be32 saddr; 289 int err; 290 291 if (!sock) 292 return -ESHUTDOWN; 293 294 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, 295 IPPROTO_UDP, use_cache); 296 297 if (IS_ERR(rt)) 298 return PTR_ERR(rt); 299 300 skb_tunnel_check_pmtu(skb, &rt->dst, 301 BAREUDP_IPV4_HLEN + info->options_len, false); 302 303 sport = udp_flow_src_port(bareudp->net, skb, 304 bareudp->sport_min, USHRT_MAX, 305 true); 306 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 307 ttl = key->ttl; 308 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 309 skb_scrub_packet(skb, xnet); 310 311 err = -ENOSPC; 312 if (!skb_pull(skb, skb_network_offset(skb))) 313 goto free_dst; 314 315 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 316 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 317 318 err = skb_cow_head(skb, min_headroom); 319 if (unlikely(err)) 320 goto free_dst; 321 322 err = udp_tunnel_handle_offloads(skb, udp_sum); 323 if (err) 324 goto free_dst; 325 326 skb_set_inner_protocol(skb, bareudp->ethertype); 327 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 328 tos, ttl, df, sport, bareudp->port, 329 !net_eq(bareudp->net, dev_net(bareudp->dev)), 330 !(info->key.tun_flags & TUNNEL_CSUM)); 331 return 0; 332 333 free_dst: 334 dst_release(&rt->dst); 335 return err; 336 } 337 338 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 339 struct bareudp_dev *bareudp, 340 const struct ip_tunnel_info *info) 341 { 342 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 343 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 344 struct socket *sock = rcu_dereference(bareudp->sock); 345 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 346 const struct ip_tunnel_key *key = &info->key; 347 struct dst_entry *dst = NULL; 348 struct in6_addr saddr, daddr; 349 int min_headroom; 350 __u8 prio, ttl; 351 __be16 sport; 352 int err; 353 354 if (!sock) 355 return -ESHUTDOWN; 356 357 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, 358 IPPROTO_UDP, use_cache); 359 if (IS_ERR(dst)) 360 return PTR_ERR(dst); 361 362 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 363 false); 364 365 sport = udp_flow_src_port(bareudp->net, skb, 366 bareudp->sport_min, USHRT_MAX, 367 true); 368 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 369 ttl = key->ttl; 370 371 skb_scrub_packet(skb, xnet); 372 373 err = -ENOSPC; 374 if (!skb_pull(skb, skb_network_offset(skb))) 375 goto free_dst; 376 377 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 378 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 379 380 err = skb_cow_head(skb, min_headroom); 381 if (unlikely(err)) 382 goto free_dst; 383 384 err = udp_tunnel_handle_offloads(skb, udp_sum); 385 if (err) 386 goto free_dst; 387 388 daddr = info->key.u.ipv6.dst; 389 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 390 &saddr, &daddr, prio, ttl, 391 info->key.label, sport, bareudp->port, 392 !(info->key.tun_flags & TUNNEL_CSUM)); 393 return 0; 394 395 free_dst: 396 dst_release(dst); 397 return err; 398 } 399 400 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 401 { 402 if (bareudp->ethertype == proto) 403 return true; 404 405 if (!bareudp->multi_proto_mode) 406 return false; 407 408 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 409 proto == htons(ETH_P_MPLS_MC)) 410 return true; 411 412 if (bareudp->ethertype == htons(ETH_P_IP) && 413 proto == htons(ETH_P_IPV6)) 414 return true; 415 416 return false; 417 } 418 419 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 420 { 421 struct bareudp_dev *bareudp = netdev_priv(dev); 422 struct ip_tunnel_info *info = NULL; 423 int err; 424 425 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 426 err = -EINVAL; 427 goto tx_error; 428 } 429 430 info = skb_tunnel_info(skb); 431 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 432 err = -EINVAL; 433 goto tx_error; 434 } 435 436 rcu_read_lock(); 437 if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6) 438 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 439 else 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 (!IS_ENABLED(CONFIG_IPV6) || 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 } else if (ip_tunnel_info_af(info) == AF_INET6) { 479 struct dst_entry *dst; 480 struct in6_addr saddr; 481 struct socket *sock = rcu_dereference(bareudp->sock); 482 483 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, 484 &saddr, info, IPPROTO_UDP, 485 use_cache); 486 if (IS_ERR(dst)) 487 return PTR_ERR(dst); 488 489 dst_release(dst); 490 info->key.u.ipv6.src = saddr; 491 } else { 492 return -EINVAL; 493 } 494 495 info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 496 bareudp->sport_min, 497 USHRT_MAX, true); 498 info->key.tp_dst = bareudp->port; 499 return 0; 500 } 501 502 static const struct net_device_ops bareudp_netdev_ops = { 503 .ndo_init = bareudp_init, 504 .ndo_uninit = bareudp_uninit, 505 .ndo_open = bareudp_open, 506 .ndo_stop = bareudp_stop, 507 .ndo_start_xmit = bareudp_xmit, 508 .ndo_get_stats64 = dev_get_tstats64, 509 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 510 }; 511 512 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 513 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 514 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 515 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 516 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 517 }; 518 519 /* Info for udev, that this is a virtual tunnel endpoint */ 520 static const struct device_type bareudp_type = { 521 .name = "bareudp", 522 }; 523 524 /* Initialize the device structure. */ 525 static void bareudp_setup(struct net_device *dev) 526 { 527 dev->netdev_ops = &bareudp_netdev_ops; 528 dev->needs_free_netdev = true; 529 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 530 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 531 dev->features |= NETIF_F_RXCSUM; 532 dev->features |= NETIF_F_LLTX; 533 dev->features |= NETIF_F_GSO_SOFTWARE; 534 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 535 dev->hw_features |= 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 struct netlink_ext_ack *extack) 561 { 562 memset(conf, 0, sizeof(*conf)); 563 564 if (!data[IFLA_BAREUDP_PORT]) { 565 NL_SET_ERR_MSG(extack, "port not specified"); 566 return -EINVAL; 567 } 568 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 569 NL_SET_ERR_MSG(extack, "ethertype not specified"); 570 return -EINVAL; 571 } 572 573 if (data[IFLA_BAREUDP_PORT]) 574 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 575 576 if (data[IFLA_BAREUDP_ETHERTYPE]) 577 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 578 579 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 580 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 581 582 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 583 conf->multi_proto_mode = true; 584 585 return 0; 586 } 587 588 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 589 const struct bareudp_conf *conf) 590 { 591 struct bareudp_dev *bareudp, *t = NULL; 592 593 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 594 if (conf->port == bareudp->port) 595 t = bareudp; 596 } 597 return t; 598 } 599 600 static int bareudp_configure(struct net *net, struct net_device *dev, 601 struct bareudp_conf *conf) 602 { 603 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 604 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 605 int err; 606 607 bareudp->net = net; 608 bareudp->dev = dev; 609 t = bareudp_find_dev(bn, conf); 610 if (t) 611 return -EBUSY; 612 613 if (conf->multi_proto_mode && 614 (conf->ethertype != htons(ETH_P_MPLS_UC) && 615 conf->ethertype != htons(ETH_P_IP))) 616 return -EINVAL; 617 618 bareudp->port = conf->port; 619 bareudp->ethertype = conf->ethertype; 620 bareudp->sport_min = conf->sport_min; 621 bareudp->multi_proto_mode = conf->multi_proto_mode; 622 623 err = register_netdevice(dev); 624 if (err) 625 return err; 626 627 list_add(&bareudp->next, &bn->bareudp_list); 628 return 0; 629 } 630 631 static int bareudp_link_config(struct net_device *dev, 632 struct nlattr *tb[]) 633 { 634 int err; 635 636 if (tb[IFLA_MTU]) { 637 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 638 if (err) 639 return err; 640 } 641 return 0; 642 } 643 644 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 645 { 646 struct bareudp_dev *bareudp = netdev_priv(dev); 647 648 list_del(&bareudp->next); 649 unregister_netdevice_queue(dev, head); 650 } 651 652 static int bareudp_newlink(struct net *net, struct net_device *dev, 653 struct nlattr *tb[], struct nlattr *data[], 654 struct netlink_ext_ack *extack) 655 { 656 struct bareudp_conf conf; 657 int err; 658 659 err = bareudp2info(data, &conf, extack); 660 if (err) 661 return err; 662 663 err = bareudp_configure(net, dev, &conf); 664 if (err) 665 return err; 666 667 err = bareudp_link_config(dev, tb); 668 if (err) 669 goto err_unconfig; 670 671 return 0; 672 673 err_unconfig: 674 bareudp_dellink(dev, NULL); 675 return err; 676 } 677 678 static size_t bareudp_get_size(const struct net_device *dev) 679 { 680 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 681 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 682 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 683 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 684 0; 685 } 686 687 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 688 { 689 struct bareudp_dev *bareudp = netdev_priv(dev); 690 691 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 692 goto nla_put_failure; 693 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 694 goto nla_put_failure; 695 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 696 goto nla_put_failure; 697 if (bareudp->multi_proto_mode && 698 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 699 goto nla_put_failure; 700 701 return 0; 702 703 nla_put_failure: 704 return -EMSGSIZE; 705 } 706 707 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 708 .kind = "bareudp", 709 .maxtype = IFLA_BAREUDP_MAX, 710 .policy = bareudp_policy, 711 .priv_size = sizeof(struct bareudp_dev), 712 .setup = bareudp_setup, 713 .validate = bareudp_validate, 714 .newlink = bareudp_newlink, 715 .dellink = bareudp_dellink, 716 .get_size = bareudp_get_size, 717 .fill_info = bareudp_fill_info, 718 }; 719 720 struct net_device *bareudp_dev_create(struct net *net, const char *name, 721 u8 name_assign_type, 722 struct bareudp_conf *conf) 723 { 724 struct nlattr *tb[IFLA_MAX + 1]; 725 struct net_device *dev; 726 int err; 727 728 memset(tb, 0, sizeof(tb)); 729 dev = rtnl_create_link(net, name, name_assign_type, 730 &bareudp_link_ops, tb, NULL); 731 if (IS_ERR(dev)) 732 return dev; 733 734 err = bareudp_configure(net, dev, conf); 735 if (err) { 736 free_netdev(dev); 737 return ERR_PTR(err); 738 } 739 err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN); 740 if (err) 741 goto err; 742 743 err = rtnl_configure_link(dev, NULL); 744 if (err < 0) 745 goto err; 746 747 return dev; 748 err: 749 bareudp_dellink(dev, NULL); 750 return ERR_PTR(err); 751 } 752 EXPORT_SYMBOL_GPL(bareudp_dev_create); 753 754 static __net_init int bareudp_init_net(struct net *net) 755 { 756 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 757 758 INIT_LIST_HEAD(&bn->bareudp_list); 759 return 0; 760 } 761 762 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 763 { 764 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 765 struct bareudp_dev *bareudp, *next; 766 767 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 768 unregister_netdevice_queue(bareudp->dev, head); 769 } 770 771 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 772 { 773 struct net *net; 774 LIST_HEAD(list); 775 776 rtnl_lock(); 777 list_for_each_entry(net, net_list, exit_list) 778 bareudp_destroy_tunnels(net, &list); 779 780 /* unregister the devices gathered above */ 781 unregister_netdevice_many(&list); 782 rtnl_unlock(); 783 } 784 785 static struct pernet_operations bareudp_net_ops = { 786 .init = bareudp_init_net, 787 .exit_batch = bareudp_exit_batch_net, 788 .id = &bareudp_net_id, 789 .size = sizeof(struct bareudp_net), 790 }; 791 792 static int __init bareudp_init_module(void) 793 { 794 int rc; 795 796 rc = register_pernet_subsys(&bareudp_net_ops); 797 if (rc) 798 goto out1; 799 800 rc = rtnl_link_register(&bareudp_link_ops); 801 if (rc) 802 goto out2; 803 804 return 0; 805 out2: 806 unregister_pernet_subsys(&bareudp_net_ops); 807 out1: 808 return rc; 809 } 810 late_initcall(bareudp_init_module); 811 812 static void __exit bareudp_cleanup_module(void) 813 { 814 rtnl_link_unregister(&bareudp_link_ops); 815 unregister_pernet_subsys(&bareudp_net_ops); 816 } 817 module_exit(bareudp_cleanup_module); 818 819 MODULE_ALIAS_RTNL_LINK("bareudp"); 820 MODULE_LICENSE("GPL"); 821 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 822 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 823