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 29static bool log_ecn_error = true; 30module_param(log_ecn_error, bool, 0644); 31MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 32 33/* per-network namespace private data for this module */ 34 35static unsigned int bareudp_net_id; 36 37struct bareudp_net { 38 struct list_head bareudp_list; 39}; 40 41struct bareudp_conf { 42 __be16 ethertype; 43 __be16 port; 44 u16 sport_min; 45 bool multi_proto_mode; 46}; 47 48/* Pseudo network device */ 49struct bareudp_dev { 50 struct net *net; /* netns for packet i/o */ 51 struct net_device *dev; /* netdev for bareudp tunnel */ 52 __be16 ethertype; 53 __be16 port; 54 u16 sport_min; 55 bool multi_proto_mode; 56 struct socket __rcu *sock; 57 struct list_head next; /* bareudp node on namespace list */ 58 struct gro_cells gro_cells; 59}; 60 61static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 62{ 63 struct metadata_dst *tun_dst = NULL; 64 struct bareudp_dev *bareudp; 65 unsigned short family; 66 unsigned int len; 67 __be16 proto; 68 void *oiph; 69 int err; 70 71 bareudp = rcu_dereference_sk_user_data(sk); 72 if (!bareudp) 73 goto drop; 74 75 if (skb->protocol == htons(ETH_P_IP)) 76 family = AF_INET; 77 else 78 family = AF_INET6; 79 80 if (bareudp->ethertype == htons(ETH_P_IP)) { 81 __u8 ipversion; 82 83 if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion, 84 sizeof(ipversion))) { 85 bareudp->dev->stats.rx_dropped++; 86 goto drop; 87 } 88 ipversion >>= 4; 89 90 if (ipversion == 4) { 91 proto = htons(ETH_P_IP); 92 } else if (ipversion == 6 && bareudp->multi_proto_mode) { 93 proto = htons(ETH_P_IPV6); 94 } else { 95 bareudp->dev->stats.rx_dropped++; 96 goto drop; 97 } 98 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { 99 struct iphdr *tunnel_hdr; 100 101 tunnel_hdr = (struct iphdr *)skb_network_header(skb); 102 if (tunnel_hdr->version == 4) { 103 if (!ipv4_is_multicast(tunnel_hdr->daddr)) { 104 proto = bareudp->ethertype; 105 } else if (bareudp->multi_proto_mode && 106 ipv4_is_multicast(tunnel_hdr->daddr)) { 107 proto = htons(ETH_P_MPLS_MC); 108 } else { 109 bareudp->dev->stats.rx_dropped++; 110 goto drop; 111 } 112 } else { 113 int addr_type; 114 struct ipv6hdr *tunnel_hdr_v6; 115 116 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); 117 addr_type = 118 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); 119 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 120 proto = bareudp->ethertype; 121 } else if (bareudp->multi_proto_mode && 122 (addr_type & IPV6_ADDR_MULTICAST)) { 123 proto = htons(ETH_P_MPLS_MC); 124 } else { 125 bareudp->dev->stats.rx_dropped++; 126 goto drop; 127 } 128 } 129 } else { 130 proto = bareudp->ethertype; 131 } 132 133 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, 134 proto, 135 !net_eq(bareudp->net, 136 dev_net(bareudp->dev)))) { 137 bareudp->dev->stats.rx_dropped++; 138 goto drop; 139 } 140 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0); 141 if (!tun_dst) { 142 bareudp->dev->stats.rx_dropped++; 143 goto drop; 144 } 145 skb_dst_set(skb, &tun_dst->dst); 146 skb->dev = bareudp->dev; 147 oiph = skb_network_header(skb); 148 skb_reset_network_header(skb); 149 skb_reset_mac_header(skb); 150 151 if (!ipv6_mod_enabled() || family == AF_INET) 152 err = IP_ECN_decapsulate(oiph, skb); 153 else 154 err = IP6_ECN_decapsulate(oiph, skb); 155 156 if (unlikely(err)) { 157 if (log_ecn_error) { 158 if (!ipv6_mod_enabled() || family == AF_INET) 159 net_info_ratelimited("non-ECT from %pI4 " 160 "with TOS=%#x\n", 161 &((struct iphdr *)oiph)->saddr, 162 ((struct iphdr *)oiph)->tos); 163 else 164 net_info_ratelimited("non-ECT from %pI6\n", 165 &((struct ipv6hdr *)oiph)->saddr); 166 } 167 if (err > 1) { 168 ++bareudp->dev->stats.rx_frame_errors; 169 ++bareudp->dev->stats.rx_errors; 170 goto drop; 171 } 172 } 173 174 len = skb->len; 175 err = gro_cells_receive(&bareudp->gro_cells, skb); 176 if (likely(err == NET_RX_SUCCESS)) 177 dev_sw_netstats_rx_add(bareudp->dev, len); 178 179 return 0; 180drop: 181 /* Consume bad packet */ 182 kfree_skb(skb); 183 184 return 0; 185} 186 187static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 188{ 189 return 0; 190} 191 192static int bareudp_init(struct net_device *dev) 193{ 194 struct bareudp_dev *bareudp = netdev_priv(dev); 195 int err; 196 197 err = gro_cells_init(&bareudp->gro_cells, dev); 198 if (err) 199 return err; 200 201 return 0; 202} 203 204static void bareudp_uninit(struct net_device *dev) 205{ 206 struct bareudp_dev *bareudp = netdev_priv(dev); 207 208 gro_cells_destroy(&bareudp->gro_cells); 209} 210 211static struct socket *bareudp_create_sock(struct net *net, __be16 port) 212{ 213 struct udp_port_cfg udp_conf; 214 struct socket *sock; 215 int err; 216 217 memset(&udp_conf, 0, sizeof(udp_conf)); 218 219 if (ipv6_mod_enabled()) 220 udp_conf.family = AF_INET6; 221 else 222 udp_conf.family = AF_INET; 223 224 udp_conf.local_udp_port = port; 225 /* Open UDP socket */ 226 err = udp_sock_create(net, &udp_conf, &sock); 227 if (err < 0) 228 return ERR_PTR(err); 229 230 udp_allow_gso(sock->sk); 231 return sock; 232} 233 234/* Create new listen socket if needed */ 235static 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 rcu_assign_pointer(bareudp->sock, sock); 254 return 0; 255} 256 257static int bareudp_open(struct net_device *dev) 258{ 259 struct bareudp_dev *bareudp = netdev_priv(dev); 260 int ret = 0; 261 262 ret = bareudp_socket_create(bareudp, bareudp->port); 263 return ret; 264} 265 266static void bareudp_sock_release(struct bareudp_dev *bareudp) 267{ 268 struct socket *sock; 269 270 sock = bareudp->sock; 271 rcu_assign_pointer(bareudp->sock, NULL); 272 synchronize_net(); 273 udp_tunnel_sock_release(sock); 274} 275 276static int bareudp_stop(struct net_device *dev) 277{ 278 struct bareudp_dev *bareudp = netdev_priv(dev); 279 280 bareudp_sock_release(bareudp); 281 return 0; 282} 283 284static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 285 struct bareudp_dev *bareudp, 286 const struct ip_tunnel_info *info) 287{ 288 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 289 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 290 struct socket *sock = rcu_dereference(bareudp->sock); 291 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 292 const struct ip_tunnel_key *key = &info->key; 293 struct rtable *rt; 294 __be16 sport, df; 295 int min_headroom; 296 __u8 tos, ttl; 297 __be32 saddr; 298 int err; 299 300 if (!sock) 301 return -ESHUTDOWN; 302 303 sport = udp_flow_src_port(bareudp->net, skb, 304 bareudp->sport_min, USHRT_MAX, 305 true); 306 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, 307 sport, bareudp->port, key->tos, 308 use_cache ? 309 (struct dst_cache *)&info->dst_cache : NULL); 310 311 if (IS_ERR(rt)) 312 return PTR_ERR(rt); 313 314 skb_tunnel_check_pmtu(skb, &rt->dst, 315 BAREUDP_IPV4_HLEN + info->options_len, false); 316 317 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 318 ttl = key->ttl; 319 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 320 skb_scrub_packet(skb, xnet); 321 322 err = -ENOSPC; 323 if (!skb_pull(skb, skb_network_offset(skb))) 324 goto free_dst; 325 326 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 327 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 328 329 err = skb_cow_head(skb, min_headroom); 330 if (unlikely(err)) 331 goto free_dst; 332 333 err = udp_tunnel_handle_offloads(skb, udp_sum); 334 if (err) 335 goto free_dst; 336 337 skb_set_inner_protocol(skb, bareudp->ethertype); 338 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 339 tos, ttl, df, sport, bareudp->port, 340 !net_eq(bareudp->net, dev_net(bareudp->dev)), 341 !(info->key.tun_flags & TUNNEL_CSUM)); 342 return 0; 343 344free_dst: 345 dst_release(&rt->dst); 346 return err; 347} 348 349static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 350 struct bareudp_dev *bareudp, 351 const struct ip_tunnel_info *info) 352{ 353 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 354 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 355 struct socket *sock = rcu_dereference(bareudp->sock); 356 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 357 const struct ip_tunnel_key *key = &info->key; 358 struct dst_entry *dst = NULL; 359 struct in6_addr saddr, daddr; 360 int min_headroom; 361 __u8 prio, ttl; 362 __be16 sport; 363 int err; 364 365 if (!sock) 366 return -ESHUTDOWN; 367 368 sport = udp_flow_src_port(bareudp->net, skb, 369 bareudp->sport_min, USHRT_MAX, 370 true); 371 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sock, 0, &saddr, 372 key, sport, bareudp->port, key->tos, 373 use_cache ? 374 (struct dst_cache *) &info->dst_cache : NULL); 375 if (IS_ERR(dst)) 376 return PTR_ERR(dst); 377 378 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 379 false); 380 381 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 382 ttl = key->ttl; 383 384 skb_scrub_packet(skb, xnet); 385 386 err = -ENOSPC; 387 if (!skb_pull(skb, skb_network_offset(skb))) 388 goto free_dst; 389 390 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 391 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 392 393 err = skb_cow_head(skb, min_headroom); 394 if (unlikely(err)) 395 goto free_dst; 396 397 err = udp_tunnel_handle_offloads(skb, udp_sum); 398 if (err) 399 goto free_dst; 400 401 daddr = info->key.u.ipv6.dst; 402 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 403 &saddr, &daddr, prio, ttl, 404 info->key.label, sport, bareudp->port, 405 !(info->key.tun_flags & TUNNEL_CSUM)); 406 return 0; 407 408free_dst: 409 dst_release(dst); 410 return err; 411} 412 413static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 414{ 415 if (bareudp->ethertype == proto) 416 return true; 417 418 if (!bareudp->multi_proto_mode) 419 return false; 420 421 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 422 proto == htons(ETH_P_MPLS_MC)) 423 return true; 424 425 if (bareudp->ethertype == htons(ETH_P_IP) && 426 proto == htons(ETH_P_IPV6)) 427 return true; 428 429 return false; 430} 431 432static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 433{ 434 struct bareudp_dev *bareudp = netdev_priv(dev); 435 struct ip_tunnel_info *info = NULL; 436 int err; 437 438 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 439 err = -EINVAL; 440 goto tx_error; 441 } 442 443 info = skb_tunnel_info(skb); 444 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 445 err = -EINVAL; 446 goto tx_error; 447 } 448 449 rcu_read_lock(); 450 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6) 451 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 452 else 453 err = bareudp_xmit_skb(skb, dev, bareudp, info); 454 455 rcu_read_unlock(); 456 457 if (likely(!err)) 458 return NETDEV_TX_OK; 459tx_error: 460 dev_kfree_skb(skb); 461 462 if (err == -ELOOP) 463 dev->stats.collisions++; 464 else if (err == -ENETUNREACH) 465 dev->stats.tx_carrier_errors++; 466 467 dev->stats.tx_errors++; 468 return NETDEV_TX_OK; 469} 470 471static int bareudp_fill_metadata_dst(struct net_device *dev, 472 struct sk_buff *skb) 473{ 474 struct ip_tunnel_info *info = skb_tunnel_info(skb); 475 struct bareudp_dev *bareudp = netdev_priv(dev); 476 bool use_cache; 477 __be16 sport; 478 479 use_cache = ip_tunnel_dst_cache_usable(skb, info); 480 sport = udp_flow_src_port(bareudp->net, skb, 481 bareudp->sport_min, USHRT_MAX, 482 true); 483 484 if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) { 485 struct rtable *rt; 486 __be32 saddr; 487 488 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, 489 &info->key, sport, bareudp->port, 490 info->key.tos, 491 use_cache ? &info->dst_cache : NULL); 492 if (IS_ERR(rt)) 493 return PTR_ERR(rt); 494 495 ip_rt_put(rt); 496 info->key.u.ipv4.src = saddr; 497 } else if (ip_tunnel_info_af(info) == AF_INET6) { 498 struct dst_entry *dst; 499 struct in6_addr saddr; 500 struct socket *sock = rcu_dereference(bareudp->sock); 501 502 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sock, 503 0, &saddr, &info->key, 504 sport, bareudp->port, info->key.tos, 505 use_cache ? &info->dst_cache : NULL); 506 if (IS_ERR(dst)) 507 return PTR_ERR(dst); 508 509 dst_release(dst); 510 info->key.u.ipv6.src = saddr; 511 } else { 512 return -EINVAL; 513 } 514 515 info->key.tp_src = sport; 516 info->key.tp_dst = bareudp->port; 517 return 0; 518} 519 520static const struct net_device_ops bareudp_netdev_ops = { 521 .ndo_init = bareudp_init, 522 .ndo_uninit = bareudp_uninit, 523 .ndo_open = bareudp_open, 524 .ndo_stop = bareudp_stop, 525 .ndo_start_xmit = bareudp_xmit, 526 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 527}; 528 529static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 530 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 531 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 532 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 533 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 534}; 535 536/* Info for udev, that this is a virtual tunnel endpoint */ 537static const struct device_type bareudp_type = { 538 .name = "bareudp", 539}; 540 541/* Initialize the device structure. */ 542static void bareudp_setup(struct net_device *dev) 543{ 544 dev->netdev_ops = &bareudp_netdev_ops; 545 dev->needs_free_netdev = true; 546 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 547 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 548 dev->features |= NETIF_F_RXCSUM; 549 dev->features |= NETIF_F_LLTX; 550 dev->features |= NETIF_F_GSO_SOFTWARE; 551 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 552 dev->hw_features |= NETIF_F_RXCSUM; 553 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 554 dev->hard_header_len = 0; 555 dev->addr_len = 0; 556 dev->mtu = ETH_DATA_LEN; 557 dev->min_mtu = IPV4_MIN_MTU; 558 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 559 dev->type = ARPHRD_NONE; 560 netif_keep_dst(dev); 561 dev->priv_flags |= IFF_NO_QUEUE; 562 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 563 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 564} 565 566static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 567 struct netlink_ext_ack *extack) 568{ 569 if (!data) { 570 NL_SET_ERR_MSG(extack, 571 "Not enough attributes provided to perform the operation"); 572 return -EINVAL; 573 } 574 return 0; 575} 576 577static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 578 struct netlink_ext_ack *extack) 579{ 580 memset(conf, 0, sizeof(*conf)); 581 582 if (!data[IFLA_BAREUDP_PORT]) { 583 NL_SET_ERR_MSG(extack, "port not specified"); 584 return -EINVAL; 585 } 586 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 587 NL_SET_ERR_MSG(extack, "ethertype not specified"); 588 return -EINVAL; 589 } 590 591 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 592 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 593 594 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 595 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 596 597 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 598 conf->multi_proto_mode = true; 599 600 return 0; 601} 602 603static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 604 const struct bareudp_conf *conf) 605{ 606 struct bareudp_dev *bareudp, *t = NULL; 607 608 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 609 if (conf->port == bareudp->port) 610 t = bareudp; 611 } 612 return t; 613} 614 615static int bareudp_configure(struct net *net, struct net_device *dev, 616 struct bareudp_conf *conf, 617 struct netlink_ext_ack *extack) 618{ 619 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 620 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 621 int err; 622 623 bareudp->net = net; 624 bareudp->dev = dev; 625 t = bareudp_find_dev(bn, conf); 626 if (t) { 627 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); 628 return -EBUSY; 629 } 630 631 if (conf->multi_proto_mode && 632 (conf->ethertype != htons(ETH_P_MPLS_UC) && 633 conf->ethertype != htons(ETH_P_IP))) { 634 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); 635 return -EINVAL; 636 } 637 638 bareudp->port = conf->port; 639 bareudp->ethertype = conf->ethertype; 640 bareudp->sport_min = conf->sport_min; 641 bareudp->multi_proto_mode = conf->multi_proto_mode; 642 643 err = register_netdevice(dev); 644 if (err) 645 return err; 646 647 list_add(&bareudp->next, &bn->bareudp_list); 648 return 0; 649} 650 651static int bareudp_link_config(struct net_device *dev, 652 struct nlattr *tb[]) 653{ 654 int err; 655 656 if (tb[IFLA_MTU]) { 657 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 658 if (err) 659 return err; 660 } 661 return 0; 662} 663 664static void bareudp_dellink(struct net_device *dev, struct list_head *head) 665{ 666 struct bareudp_dev *bareudp = netdev_priv(dev); 667 668 list_del(&bareudp->next); 669 unregister_netdevice_queue(dev, head); 670} 671 672static int bareudp_newlink(struct net *net, struct net_device *dev, 673 struct nlattr *tb[], struct nlattr *data[], 674 struct netlink_ext_ack *extack) 675{ 676 struct bareudp_conf conf; 677 int err; 678 679 err = bareudp2info(data, &conf, extack); 680 if (err) 681 return err; 682 683 err = bareudp_configure(net, dev, &conf, extack); 684 if (err) 685 return err; 686 687 err = bareudp_link_config(dev, tb); 688 if (err) 689 goto err_unconfig; 690 691 return 0; 692 693err_unconfig: 694 bareudp_dellink(dev, NULL); 695 return err; 696} 697 698static size_t bareudp_get_size(const struct net_device *dev) 699{ 700 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 701 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 702 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 703 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 704 0; 705} 706 707static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 708{ 709 struct bareudp_dev *bareudp = netdev_priv(dev); 710 711 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 712 goto nla_put_failure; 713 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 714 goto nla_put_failure; 715 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 716 goto nla_put_failure; 717 if (bareudp->multi_proto_mode && 718 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 719 goto nla_put_failure; 720 721 return 0; 722 723nla_put_failure: 724 return -EMSGSIZE; 725} 726 727static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 728 .kind = "bareudp", 729 .maxtype = IFLA_BAREUDP_MAX, 730 .policy = bareudp_policy, 731 .priv_size = sizeof(struct bareudp_dev), 732 .setup = bareudp_setup, 733 .validate = bareudp_validate, 734 .newlink = bareudp_newlink, 735 .dellink = bareudp_dellink, 736 .get_size = bareudp_get_size, 737 .fill_info = bareudp_fill_info, 738}; 739 740static __net_init int bareudp_init_net(struct net *net) 741{ 742 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 743 744 INIT_LIST_HEAD(&bn->bareudp_list); 745 return 0; 746} 747 748static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 749{ 750 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 751 struct bareudp_dev *bareudp, *next; 752 753 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 754 unregister_netdevice_queue(bareudp->dev, head); 755} 756 757static void __net_exit bareudp_exit_batch_rtnl(struct list_head *net_list, 758 struct list_head *dev_kill_list) 759{ 760 struct net *net; 761 762 list_for_each_entry(net, net_list, exit_list) 763 bareudp_destroy_tunnels(net, dev_kill_list); 764} 765 766static struct pernet_operations bareudp_net_ops = { 767 .init = bareudp_init_net, 768 .exit_batch_rtnl = bareudp_exit_batch_rtnl, 769 .id = &bareudp_net_id, 770 .size = sizeof(struct bareudp_net), 771}; 772 773static int __init bareudp_init_module(void) 774{ 775 int rc; 776 777 rc = register_pernet_subsys(&bareudp_net_ops); 778 if (rc) 779 goto out1; 780 781 rc = rtnl_link_register(&bareudp_link_ops); 782 if (rc) 783 goto out2; 784 785 return 0; 786out2: 787 unregister_pernet_subsys(&bareudp_net_ops); 788out1: 789 return rc; 790} 791late_initcall(bareudp_init_module); 792 793static void __exit bareudp_cleanup_module(void) 794{ 795 rtnl_link_unregister(&bareudp_link_ops); 796 unregister_pernet_subsys(&bareudp_net_ops); 797} 798module_exit(bareudp_cleanup_module); 799 800MODULE_ALIAS_RTNL_LINK("bareudp"); 801MODULE_LICENSE("GPL"); 802MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 803MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 804