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 struct bareudp_conf { 42 __be16 ethertype; 43 __be16 port; 44 u16 sport_min; 45 bool multi_proto_mode; 46 }; 47 48 /* Pseudo network device */ 49 struct 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 61 static 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 (!IS_ENABLED(CONFIG_IPV6) || 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 (!IS_ENABLED(CONFIG_IPV6) || 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; 180 drop: 181 /* Consume bad packet */ 182 kfree_skb(skb); 183 184 return 0; 185 } 186 187 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 188 { 189 return 0; 190 } 191 192 static int bareudp_init(struct net_device *dev) 193 { 194 struct bareudp_dev *bareudp = netdev_priv(dev); 195 int err; 196 197 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 198 if (!dev->tstats) 199 return -ENOMEM; 200 201 err = gro_cells_init(&bareudp->gro_cells, dev); 202 if (err) { 203 free_percpu(dev->tstats); 204 return err; 205 } 206 return 0; 207 } 208 209 static void bareudp_uninit(struct net_device *dev) 210 { 211 struct bareudp_dev *bareudp = netdev_priv(dev); 212 213 gro_cells_destroy(&bareudp->gro_cells); 214 free_percpu(dev->tstats); 215 } 216 217 static struct socket *bareudp_create_sock(struct net *net, __be16 port) 218 { 219 struct udp_port_cfg udp_conf; 220 struct socket *sock; 221 int err; 222 223 memset(&udp_conf, 0, sizeof(udp_conf)); 224 #if IS_ENABLED(CONFIG_IPV6) 225 udp_conf.family = AF_INET6; 226 #else 227 udp_conf.family = AF_INET; 228 #endif 229 udp_conf.local_udp_port = port; 230 /* Open UDP socket */ 231 err = udp_sock_create(net, &udp_conf, &sock); 232 if (err < 0) 233 return ERR_PTR(err); 234 235 udp_allow_gso(sock->sk); 236 return sock; 237 } 238 239 /* Create new listen socket if needed */ 240 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 241 { 242 struct udp_tunnel_sock_cfg tunnel_cfg; 243 struct socket *sock; 244 245 sock = bareudp_create_sock(bareudp->net, port); 246 if (IS_ERR(sock)) 247 return PTR_ERR(sock); 248 249 /* Mark socket as an encapsulation socket */ 250 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 251 tunnel_cfg.sk_user_data = bareudp; 252 tunnel_cfg.encap_type = 1; 253 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 254 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 255 tunnel_cfg.encap_destroy = NULL; 256 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 257 258 rcu_assign_pointer(bareudp->sock, sock); 259 return 0; 260 } 261 262 static int bareudp_open(struct net_device *dev) 263 { 264 struct bareudp_dev *bareudp = netdev_priv(dev); 265 int ret = 0; 266 267 ret = bareudp_socket_create(bareudp, bareudp->port); 268 return ret; 269 } 270 271 static void bareudp_sock_release(struct bareudp_dev *bareudp) 272 { 273 struct socket *sock; 274 275 sock = bareudp->sock; 276 rcu_assign_pointer(bareudp->sock, NULL); 277 synchronize_net(); 278 udp_tunnel_sock_release(sock); 279 } 280 281 static int bareudp_stop(struct net_device *dev) 282 { 283 struct bareudp_dev *bareudp = netdev_priv(dev); 284 285 bareudp_sock_release(bareudp); 286 return 0; 287 } 288 289 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 290 struct bareudp_dev *bareudp, 291 const struct ip_tunnel_info *info) 292 { 293 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 294 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 295 struct socket *sock = rcu_dereference(bareudp->sock); 296 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 297 const struct ip_tunnel_key *key = &info->key; 298 struct rtable *rt; 299 __be16 sport, df; 300 int min_headroom; 301 __u8 tos, ttl; 302 __be32 saddr; 303 int err; 304 305 if (!sock) 306 return -ESHUTDOWN; 307 308 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, 309 IPPROTO_UDP, use_cache); 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 sport = udp_flow_src_port(bareudp->net, skb, 318 bareudp->sport_min, USHRT_MAX, 319 true); 320 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 321 ttl = key->ttl; 322 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 323 skb_scrub_packet(skb, xnet); 324 325 err = -ENOSPC; 326 if (!skb_pull(skb, skb_network_offset(skb))) 327 goto free_dst; 328 329 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 330 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 331 332 err = skb_cow_head(skb, min_headroom); 333 if (unlikely(err)) 334 goto free_dst; 335 336 err = udp_tunnel_handle_offloads(skb, udp_sum); 337 if (err) 338 goto free_dst; 339 340 skb_set_inner_protocol(skb, bareudp->ethertype); 341 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 342 tos, ttl, df, sport, bareudp->port, 343 !net_eq(bareudp->net, dev_net(bareudp->dev)), 344 !(info->key.tun_flags & TUNNEL_CSUM)); 345 return 0; 346 347 free_dst: 348 dst_release(&rt->dst); 349 return err; 350 } 351 352 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 353 struct bareudp_dev *bareudp, 354 const struct ip_tunnel_info *info) 355 { 356 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 357 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 358 struct socket *sock = rcu_dereference(bareudp->sock); 359 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 360 const struct ip_tunnel_key *key = &info->key; 361 struct dst_entry *dst = NULL; 362 struct in6_addr saddr, daddr; 363 int min_headroom; 364 __u8 prio, ttl; 365 __be16 sport; 366 int err; 367 368 if (!sock) 369 return -ESHUTDOWN; 370 371 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, 372 IPPROTO_UDP, use_cache); 373 if (IS_ERR(dst)) 374 return PTR_ERR(dst); 375 376 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 377 false); 378 379 sport = udp_flow_src_port(bareudp->net, skb, 380 bareudp->sport_min, USHRT_MAX, 381 true); 382 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 383 ttl = key->ttl; 384 385 skb_scrub_packet(skb, xnet); 386 387 err = -ENOSPC; 388 if (!skb_pull(skb, skb_network_offset(skb))) 389 goto free_dst; 390 391 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 392 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 393 394 err = skb_cow_head(skb, min_headroom); 395 if (unlikely(err)) 396 goto free_dst; 397 398 err = udp_tunnel_handle_offloads(skb, udp_sum); 399 if (err) 400 goto free_dst; 401 402 daddr = info->key.u.ipv6.dst; 403 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 404 &saddr, &daddr, prio, ttl, 405 info->key.label, sport, bareudp->port, 406 !(info->key.tun_flags & TUNNEL_CSUM)); 407 return 0; 408 409 free_dst: 410 dst_release(dst); 411 return err; 412 } 413 414 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 415 { 416 if (bareudp->ethertype == proto) 417 return true; 418 419 if (!bareudp->multi_proto_mode) 420 return false; 421 422 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 423 proto == htons(ETH_P_MPLS_MC)) 424 return true; 425 426 if (bareudp->ethertype == htons(ETH_P_IP) && 427 proto == htons(ETH_P_IPV6)) 428 return true; 429 430 return false; 431 } 432 433 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 434 { 435 struct bareudp_dev *bareudp = netdev_priv(dev); 436 struct ip_tunnel_info *info = NULL; 437 int err; 438 439 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 440 err = -EINVAL; 441 goto tx_error; 442 } 443 444 info = skb_tunnel_info(skb); 445 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 446 err = -EINVAL; 447 goto tx_error; 448 } 449 450 rcu_read_lock(); 451 if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6) 452 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 453 else 454 err = bareudp_xmit_skb(skb, dev, bareudp, info); 455 456 rcu_read_unlock(); 457 458 if (likely(!err)) 459 return NETDEV_TX_OK; 460 tx_error: 461 dev_kfree_skb(skb); 462 463 if (err == -ELOOP) 464 dev->stats.collisions++; 465 else if (err == -ENETUNREACH) 466 dev->stats.tx_carrier_errors++; 467 468 dev->stats.tx_errors++; 469 return NETDEV_TX_OK; 470 } 471 472 static int bareudp_fill_metadata_dst(struct net_device *dev, 473 struct sk_buff *skb) 474 { 475 struct ip_tunnel_info *info = skb_tunnel_info(skb); 476 struct bareudp_dev *bareudp = netdev_priv(dev); 477 bool use_cache; 478 479 use_cache = ip_tunnel_dst_cache_usable(skb, info); 480 481 if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) { 482 struct rtable *rt; 483 __be32 saddr; 484 485 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, 486 info, IPPROTO_UDP, use_cache); 487 if (IS_ERR(rt)) 488 return PTR_ERR(rt); 489 490 ip_rt_put(rt); 491 info->key.u.ipv4.src = saddr; 492 } else if (ip_tunnel_info_af(info) == AF_INET6) { 493 struct dst_entry *dst; 494 struct in6_addr saddr; 495 struct socket *sock = rcu_dereference(bareudp->sock); 496 497 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, 498 &saddr, info, IPPROTO_UDP, 499 use_cache); 500 if (IS_ERR(dst)) 501 return PTR_ERR(dst); 502 503 dst_release(dst); 504 info->key.u.ipv6.src = saddr; 505 } else { 506 return -EINVAL; 507 } 508 509 info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 510 bareudp->sport_min, 511 USHRT_MAX, true); 512 info->key.tp_dst = bareudp->port; 513 return 0; 514 } 515 516 static const struct net_device_ops bareudp_netdev_ops = { 517 .ndo_init = bareudp_init, 518 .ndo_uninit = bareudp_uninit, 519 .ndo_open = bareudp_open, 520 .ndo_stop = bareudp_stop, 521 .ndo_start_xmit = bareudp_xmit, 522 .ndo_get_stats64 = dev_get_tstats64, 523 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 524 }; 525 526 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 527 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 528 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 529 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 530 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 531 }; 532 533 /* Info for udev, that this is a virtual tunnel endpoint */ 534 static const struct device_type bareudp_type = { 535 .name = "bareudp", 536 }; 537 538 /* Initialize the device structure. */ 539 static void bareudp_setup(struct net_device *dev) 540 { 541 dev->netdev_ops = &bareudp_netdev_ops; 542 dev->needs_free_netdev = true; 543 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 544 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 545 dev->features |= NETIF_F_RXCSUM; 546 dev->features |= NETIF_F_LLTX; 547 dev->features |= NETIF_F_GSO_SOFTWARE; 548 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 549 dev->hw_features |= NETIF_F_RXCSUM; 550 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 551 dev->hard_header_len = 0; 552 dev->addr_len = 0; 553 dev->mtu = ETH_DATA_LEN; 554 dev->min_mtu = IPV4_MIN_MTU; 555 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 556 dev->type = ARPHRD_NONE; 557 netif_keep_dst(dev); 558 dev->priv_flags |= IFF_NO_QUEUE; 559 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 560 } 561 562 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 563 struct netlink_ext_ack *extack) 564 { 565 if (!data) { 566 NL_SET_ERR_MSG(extack, 567 "Not enough attributes provided to perform the operation"); 568 return -EINVAL; 569 } 570 return 0; 571 } 572 573 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 574 struct netlink_ext_ack *extack) 575 { 576 memset(conf, 0, sizeof(*conf)); 577 578 if (!data[IFLA_BAREUDP_PORT]) { 579 NL_SET_ERR_MSG(extack, "port not specified"); 580 return -EINVAL; 581 } 582 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 583 NL_SET_ERR_MSG(extack, "ethertype not specified"); 584 return -EINVAL; 585 } 586 587 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 588 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 589 590 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 591 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 592 593 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 594 conf->multi_proto_mode = true; 595 596 return 0; 597 } 598 599 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 600 const struct bareudp_conf *conf) 601 { 602 struct bareudp_dev *bareudp, *t = NULL; 603 604 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 605 if (conf->port == bareudp->port) 606 t = bareudp; 607 } 608 return t; 609 } 610 611 static int bareudp_configure(struct net *net, struct net_device *dev, 612 struct bareudp_conf *conf, 613 struct netlink_ext_ack *extack) 614 { 615 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 616 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 617 int err; 618 619 bareudp->net = net; 620 bareudp->dev = dev; 621 t = bareudp_find_dev(bn, conf); 622 if (t) { 623 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); 624 return -EBUSY; 625 } 626 627 if (conf->multi_proto_mode && 628 (conf->ethertype != htons(ETH_P_MPLS_UC) && 629 conf->ethertype != htons(ETH_P_IP))) { 630 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); 631 return -EINVAL; 632 } 633 634 bareudp->port = conf->port; 635 bareudp->ethertype = conf->ethertype; 636 bareudp->sport_min = conf->sport_min; 637 bareudp->multi_proto_mode = conf->multi_proto_mode; 638 639 err = register_netdevice(dev); 640 if (err) 641 return err; 642 643 list_add(&bareudp->next, &bn->bareudp_list); 644 return 0; 645 } 646 647 static int bareudp_link_config(struct net_device *dev, 648 struct nlattr *tb[]) 649 { 650 int err; 651 652 if (tb[IFLA_MTU]) { 653 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 654 if (err) 655 return err; 656 } 657 return 0; 658 } 659 660 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 661 { 662 struct bareudp_dev *bareudp = netdev_priv(dev); 663 664 list_del(&bareudp->next); 665 unregister_netdevice_queue(dev, head); 666 } 667 668 static int bareudp_newlink(struct net *net, struct net_device *dev, 669 struct nlattr *tb[], struct nlattr *data[], 670 struct netlink_ext_ack *extack) 671 { 672 struct bareudp_conf conf; 673 int err; 674 675 err = bareudp2info(data, &conf, extack); 676 if (err) 677 return err; 678 679 err = bareudp_configure(net, dev, &conf, extack); 680 if (err) 681 return err; 682 683 err = bareudp_link_config(dev, tb); 684 if (err) 685 goto err_unconfig; 686 687 return 0; 688 689 err_unconfig: 690 bareudp_dellink(dev, NULL); 691 return err; 692 } 693 694 static size_t bareudp_get_size(const struct net_device *dev) 695 { 696 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 697 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 698 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 699 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 700 0; 701 } 702 703 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 704 { 705 struct bareudp_dev *bareudp = netdev_priv(dev); 706 707 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 708 goto nla_put_failure; 709 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 710 goto nla_put_failure; 711 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 712 goto nla_put_failure; 713 if (bareudp->multi_proto_mode && 714 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 715 goto nla_put_failure; 716 717 return 0; 718 719 nla_put_failure: 720 return -EMSGSIZE; 721 } 722 723 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 724 .kind = "bareudp", 725 .maxtype = IFLA_BAREUDP_MAX, 726 .policy = bareudp_policy, 727 .priv_size = sizeof(struct bareudp_dev), 728 .setup = bareudp_setup, 729 .validate = bareudp_validate, 730 .newlink = bareudp_newlink, 731 .dellink = bareudp_dellink, 732 .get_size = bareudp_get_size, 733 .fill_info = bareudp_fill_info, 734 }; 735 736 static __net_init int bareudp_init_net(struct net *net) 737 { 738 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 739 740 INIT_LIST_HEAD(&bn->bareudp_list); 741 return 0; 742 } 743 744 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 745 { 746 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 747 struct bareudp_dev *bareudp, *next; 748 749 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 750 unregister_netdevice_queue(bareudp->dev, head); 751 } 752 753 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 754 { 755 struct net *net; 756 LIST_HEAD(list); 757 758 rtnl_lock(); 759 list_for_each_entry(net, net_list, exit_list) 760 bareudp_destroy_tunnels(net, &list); 761 762 /* unregister the devices gathered above */ 763 unregister_netdevice_many(&list); 764 rtnl_unlock(); 765 } 766 767 static struct pernet_operations bareudp_net_ops = { 768 .init = bareudp_init_net, 769 .exit_batch = bareudp_exit_batch_net, 770 .id = &bareudp_net_id, 771 .size = sizeof(struct bareudp_net), 772 }; 773 774 static int __init bareudp_init_module(void) 775 { 776 int rc; 777 778 rc = register_pernet_subsys(&bareudp_net_ops); 779 if (rc) 780 goto out1; 781 782 rc = rtnl_link_register(&bareudp_link_ops); 783 if (rc) 784 goto out2; 785 786 return 0; 787 out2: 788 unregister_pernet_subsys(&bareudp_net_ops); 789 out1: 790 return rc; 791 } 792 late_initcall(bareudp_init_module); 793 794 static void __exit bareudp_cleanup_module(void) 795 { 796 rtnl_link_unregister(&bareudp_link_ops); 797 unregister_pernet_subsys(&bareudp_net_ops); 798 } 799 module_exit(bareudp_cleanup_module); 800 801 MODULE_ALIAS_RTNL_LINK("bareudp"); 802 MODULE_LICENSE("GPL"); 803 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 804 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 805