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 return sock; 222 } 223 224 /* Create new listen socket if needed */ 225 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 226 { 227 struct udp_tunnel_sock_cfg tunnel_cfg; 228 struct socket *sock; 229 230 sock = bareudp_create_sock(bareudp->net, port); 231 if (IS_ERR(sock)) 232 return PTR_ERR(sock); 233 234 /* Mark socket as an encapsulation socket */ 235 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 236 tunnel_cfg.sk_user_data = bareudp; 237 tunnel_cfg.encap_type = 1; 238 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 239 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 240 tunnel_cfg.encap_destroy = NULL; 241 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 242 243 rcu_assign_pointer(bareudp->sock, sock); 244 return 0; 245 } 246 247 static int bareudp_open(struct net_device *dev) 248 { 249 struct bareudp_dev *bareudp = netdev_priv(dev); 250 int ret = 0; 251 252 ret = bareudp_socket_create(bareudp, bareudp->port); 253 return ret; 254 } 255 256 static void bareudp_sock_release(struct bareudp_dev *bareudp) 257 { 258 struct socket *sock; 259 260 sock = bareudp->sock; 261 rcu_assign_pointer(bareudp->sock, NULL); 262 synchronize_net(); 263 udp_tunnel_sock_release(sock); 264 } 265 266 static int bareudp_stop(struct net_device *dev) 267 { 268 struct bareudp_dev *bareudp = netdev_priv(dev); 269 270 bareudp_sock_release(bareudp); 271 return 0; 272 } 273 274 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 275 struct bareudp_dev *bareudp, 276 const struct ip_tunnel_info *info) 277 { 278 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 279 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 280 struct socket *sock = rcu_dereference(bareudp->sock); 281 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 282 const struct ip_tunnel_key *key = &info->key; 283 struct rtable *rt; 284 __be16 sport, df; 285 int min_headroom; 286 __u8 tos, ttl; 287 __be32 saddr; 288 int err; 289 290 if (!sock) 291 return -ESHUTDOWN; 292 293 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, 294 IPPROTO_UDP, use_cache); 295 296 if (IS_ERR(rt)) 297 return PTR_ERR(rt); 298 299 skb_tunnel_check_pmtu(skb, &rt->dst, 300 BAREUDP_IPV4_HLEN + info->options_len, false); 301 302 sport = udp_flow_src_port(bareudp->net, skb, 303 bareudp->sport_min, USHRT_MAX, 304 true); 305 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 306 ttl = key->ttl; 307 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 308 skb_scrub_packet(skb, xnet); 309 310 err = -ENOSPC; 311 if (!skb_pull(skb, skb_network_offset(skb))) 312 goto free_dst; 313 314 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 315 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 316 317 err = skb_cow_head(skb, min_headroom); 318 if (unlikely(err)) 319 goto free_dst; 320 321 err = udp_tunnel_handle_offloads(skb, udp_sum); 322 if (err) 323 goto free_dst; 324 325 skb_set_inner_protocol(skb, bareudp->ethertype); 326 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 327 tos, ttl, df, sport, bareudp->port, 328 !net_eq(bareudp->net, dev_net(bareudp->dev)), 329 !(info->key.tun_flags & TUNNEL_CSUM)); 330 return 0; 331 332 free_dst: 333 dst_release(&rt->dst); 334 return err; 335 } 336 337 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 338 struct bareudp_dev *bareudp, 339 const struct ip_tunnel_info *info) 340 { 341 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 342 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 343 struct socket *sock = rcu_dereference(bareudp->sock); 344 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 345 const struct ip_tunnel_key *key = &info->key; 346 struct dst_entry *dst = NULL; 347 struct in6_addr saddr, daddr; 348 int min_headroom; 349 __u8 prio, ttl; 350 __be16 sport; 351 int err; 352 353 if (!sock) 354 return -ESHUTDOWN; 355 356 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, 357 IPPROTO_UDP, use_cache); 358 if (IS_ERR(dst)) 359 return PTR_ERR(dst); 360 361 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 362 false); 363 364 sport = udp_flow_src_port(bareudp->net, skb, 365 bareudp->sport_min, USHRT_MAX, 366 true); 367 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 368 ttl = key->ttl; 369 370 skb_scrub_packet(skb, xnet); 371 372 err = -ENOSPC; 373 if (!skb_pull(skb, skb_network_offset(skb))) 374 goto free_dst; 375 376 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 377 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 378 379 err = skb_cow_head(skb, min_headroom); 380 if (unlikely(err)) 381 goto free_dst; 382 383 err = udp_tunnel_handle_offloads(skb, udp_sum); 384 if (err) 385 goto free_dst; 386 387 daddr = info->key.u.ipv6.dst; 388 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 389 &saddr, &daddr, prio, ttl, 390 info->key.label, sport, bareudp->port, 391 !(info->key.tun_flags & TUNNEL_CSUM)); 392 return 0; 393 394 free_dst: 395 dst_release(dst); 396 return err; 397 } 398 399 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 400 { 401 if (bareudp->ethertype == proto) 402 return true; 403 404 if (!bareudp->multi_proto_mode) 405 return false; 406 407 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 408 proto == htons(ETH_P_MPLS_MC)) 409 return true; 410 411 if (bareudp->ethertype == htons(ETH_P_IP) && 412 proto == htons(ETH_P_IPV6)) 413 return true; 414 415 return false; 416 } 417 418 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 419 { 420 struct bareudp_dev *bareudp = netdev_priv(dev); 421 struct ip_tunnel_info *info = NULL; 422 int err; 423 424 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 425 err = -EINVAL; 426 goto tx_error; 427 } 428 429 info = skb_tunnel_info(skb); 430 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 431 err = -EINVAL; 432 goto tx_error; 433 } 434 435 rcu_read_lock(); 436 if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6) 437 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 438 else 439 err = bareudp_xmit_skb(skb, dev, bareudp, info); 440 441 rcu_read_unlock(); 442 443 if (likely(!err)) 444 return NETDEV_TX_OK; 445 tx_error: 446 dev_kfree_skb(skb); 447 448 if (err == -ELOOP) 449 dev->stats.collisions++; 450 else if (err == -ENETUNREACH) 451 dev->stats.tx_carrier_errors++; 452 453 dev->stats.tx_errors++; 454 return NETDEV_TX_OK; 455 } 456 457 static int bareudp_fill_metadata_dst(struct net_device *dev, 458 struct sk_buff *skb) 459 { 460 struct ip_tunnel_info *info = skb_tunnel_info(skb); 461 struct bareudp_dev *bareudp = netdev_priv(dev); 462 bool use_cache; 463 464 use_cache = ip_tunnel_dst_cache_usable(skb, info); 465 466 if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) { 467 struct rtable *rt; 468 __be32 saddr; 469 470 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, 471 info, IPPROTO_UDP, use_cache); 472 if (IS_ERR(rt)) 473 return PTR_ERR(rt); 474 475 ip_rt_put(rt); 476 info->key.u.ipv4.src = saddr; 477 } else if (ip_tunnel_info_af(info) == AF_INET6) { 478 struct dst_entry *dst; 479 struct in6_addr saddr; 480 struct socket *sock = rcu_dereference(bareudp->sock); 481 482 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, 483 &saddr, info, IPPROTO_UDP, 484 use_cache); 485 if (IS_ERR(dst)) 486 return PTR_ERR(dst); 487 488 dst_release(dst); 489 info->key.u.ipv6.src = saddr; 490 } else { 491 return -EINVAL; 492 } 493 494 info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 495 bareudp->sport_min, 496 USHRT_MAX, true); 497 info->key.tp_dst = bareudp->port; 498 return 0; 499 } 500 501 static const struct net_device_ops bareudp_netdev_ops = { 502 .ndo_init = bareudp_init, 503 .ndo_uninit = bareudp_uninit, 504 .ndo_open = bareudp_open, 505 .ndo_stop = bareudp_stop, 506 .ndo_start_xmit = bareudp_xmit, 507 .ndo_get_stats64 = dev_get_tstats64, 508 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 509 }; 510 511 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 512 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 513 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 514 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 515 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 516 }; 517 518 /* Info for udev, that this is a virtual tunnel endpoint */ 519 static const struct device_type bareudp_type = { 520 .name = "bareudp", 521 }; 522 523 /* Initialize the device structure. */ 524 static void bareudp_setup(struct net_device *dev) 525 { 526 dev->netdev_ops = &bareudp_netdev_ops; 527 dev->needs_free_netdev = true; 528 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 529 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 530 dev->features |= NETIF_F_RXCSUM; 531 dev->features |= NETIF_F_LLTX; 532 dev->features |= NETIF_F_GSO_SOFTWARE; 533 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 534 dev->hw_features |= NETIF_F_RXCSUM; 535 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 536 dev->hard_header_len = 0; 537 dev->addr_len = 0; 538 dev->mtu = ETH_DATA_LEN; 539 dev->min_mtu = IPV4_MIN_MTU; 540 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 541 dev->type = ARPHRD_NONE; 542 netif_keep_dst(dev); 543 dev->priv_flags |= IFF_NO_QUEUE; 544 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 545 } 546 547 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 548 struct netlink_ext_ack *extack) 549 { 550 if (!data) { 551 NL_SET_ERR_MSG(extack, 552 "Not enough attributes provided to perform the operation"); 553 return -EINVAL; 554 } 555 return 0; 556 } 557 558 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 559 struct netlink_ext_ack *extack) 560 { 561 memset(conf, 0, sizeof(*conf)); 562 563 if (!data[IFLA_BAREUDP_PORT]) { 564 NL_SET_ERR_MSG(extack, "port not specified"); 565 return -EINVAL; 566 } 567 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 568 NL_SET_ERR_MSG(extack, "ethertype not specified"); 569 return -EINVAL; 570 } 571 572 if (data[IFLA_BAREUDP_PORT]) 573 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 574 575 if (data[IFLA_BAREUDP_ETHERTYPE]) 576 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 577 578 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 579 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 580 581 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 582 conf->multi_proto_mode = true; 583 584 return 0; 585 } 586 587 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 588 const struct bareudp_conf *conf) 589 { 590 struct bareudp_dev *bareudp, *t = NULL; 591 592 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 593 if (conf->port == bareudp->port) 594 t = bareudp; 595 } 596 return t; 597 } 598 599 static int bareudp_configure(struct net *net, struct net_device *dev, 600 struct bareudp_conf *conf) 601 { 602 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 603 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 604 int err; 605 606 bareudp->net = net; 607 bareudp->dev = dev; 608 t = bareudp_find_dev(bn, conf); 609 if (t) 610 return -EBUSY; 611 612 if (conf->multi_proto_mode && 613 (conf->ethertype != htons(ETH_P_MPLS_UC) && 614 conf->ethertype != htons(ETH_P_IP))) 615 return -EINVAL; 616 617 bareudp->port = conf->port; 618 bareudp->ethertype = conf->ethertype; 619 bareudp->sport_min = conf->sport_min; 620 bareudp->multi_proto_mode = conf->multi_proto_mode; 621 622 err = register_netdevice(dev); 623 if (err) 624 return err; 625 626 list_add(&bareudp->next, &bn->bareudp_list); 627 return 0; 628 } 629 630 static int bareudp_link_config(struct net_device *dev, 631 struct nlattr *tb[]) 632 { 633 int err; 634 635 if (tb[IFLA_MTU]) { 636 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 637 if (err) 638 return err; 639 } 640 return 0; 641 } 642 643 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 644 { 645 struct bareudp_dev *bareudp = netdev_priv(dev); 646 647 list_del(&bareudp->next); 648 unregister_netdevice_queue(dev, head); 649 } 650 651 static int bareudp_newlink(struct net *net, struct net_device *dev, 652 struct nlattr *tb[], struct nlattr *data[], 653 struct netlink_ext_ack *extack) 654 { 655 struct bareudp_conf conf; 656 int err; 657 658 err = bareudp2info(data, &conf, extack); 659 if (err) 660 return err; 661 662 err = bareudp_configure(net, dev, &conf); 663 if (err) 664 return err; 665 666 err = bareudp_link_config(dev, tb); 667 if (err) 668 goto err_unconfig; 669 670 return 0; 671 672 err_unconfig: 673 bareudp_dellink(dev, NULL); 674 return err; 675 } 676 677 static size_t bareudp_get_size(const struct net_device *dev) 678 { 679 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 680 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 681 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 682 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 683 0; 684 } 685 686 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 687 { 688 struct bareudp_dev *bareudp = netdev_priv(dev); 689 690 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 691 goto nla_put_failure; 692 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 693 goto nla_put_failure; 694 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 695 goto nla_put_failure; 696 if (bareudp->multi_proto_mode && 697 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 698 goto nla_put_failure; 699 700 return 0; 701 702 nla_put_failure: 703 return -EMSGSIZE; 704 } 705 706 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 707 .kind = "bareudp", 708 .maxtype = IFLA_BAREUDP_MAX, 709 .policy = bareudp_policy, 710 .priv_size = sizeof(struct bareudp_dev), 711 .setup = bareudp_setup, 712 .validate = bareudp_validate, 713 .newlink = bareudp_newlink, 714 .dellink = bareudp_dellink, 715 .get_size = bareudp_get_size, 716 .fill_info = bareudp_fill_info, 717 }; 718 719 struct net_device *bareudp_dev_create(struct net *net, const char *name, 720 u8 name_assign_type, 721 struct bareudp_conf *conf) 722 { 723 struct nlattr *tb[IFLA_MAX + 1]; 724 struct net_device *dev; 725 int err; 726 727 memset(tb, 0, sizeof(tb)); 728 dev = rtnl_create_link(net, name, name_assign_type, 729 &bareudp_link_ops, tb, NULL); 730 if (IS_ERR(dev)) 731 return dev; 732 733 err = bareudp_configure(net, dev, conf); 734 if (err) { 735 free_netdev(dev); 736 return ERR_PTR(err); 737 } 738 err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN); 739 if (err) 740 goto err; 741 742 err = rtnl_configure_link(dev, NULL); 743 if (err < 0) 744 goto err; 745 746 return dev; 747 err: 748 bareudp_dellink(dev, NULL); 749 return ERR_PTR(err); 750 } 751 EXPORT_SYMBOL_GPL(bareudp_dev_create); 752 753 static __net_init int bareudp_init_net(struct net *net) 754 { 755 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 756 757 INIT_LIST_HEAD(&bn->bareudp_list); 758 return 0; 759 } 760 761 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 762 { 763 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 764 struct bareudp_dev *bareudp, *next; 765 766 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 767 unregister_netdevice_queue(bareudp->dev, head); 768 } 769 770 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 771 { 772 struct net *net; 773 LIST_HEAD(list); 774 775 rtnl_lock(); 776 list_for_each_entry(net, net_list, exit_list) 777 bareudp_destroy_tunnels(net, &list); 778 779 /* unregister the devices gathered above */ 780 unregister_netdevice_many(&list); 781 rtnl_unlock(); 782 } 783 784 static struct pernet_operations bareudp_net_ops = { 785 .init = bareudp_init_net, 786 .exit_batch = bareudp_exit_batch_net, 787 .id = &bareudp_net_id, 788 .size = sizeof(struct bareudp_net), 789 }; 790 791 static int __init bareudp_init_module(void) 792 { 793 int rc; 794 795 rc = register_pernet_subsys(&bareudp_net_ops); 796 if (rc) 797 goto out1; 798 799 rc = rtnl_link_register(&bareudp_link_ops); 800 if (rc) 801 goto out2; 802 803 return 0; 804 out2: 805 unregister_pernet_subsys(&bareudp_net_ops); 806 out1: 807 return rc; 808 } 809 late_initcall(bareudp_init_module); 810 811 static void __exit bareudp_cleanup_module(void) 812 { 813 rtnl_link_unregister(&bareudp_link_ops); 814 unregister_pernet_subsys(&bareudp_net_ops); 815 } 816 module_exit(bareudp_cleanup_module); 817 818 MODULE_ALIAS_RTNL_LINK("bareudp"); 819 MODULE_LICENSE("GPL"); 820 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 821 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 822