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 (!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; 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)); 224 225 if (ipv6_mod_enabled()) 226 udp_conf.family = AF_INET6; 227 else 228 udp_conf.family = AF_INET; 229 230 udp_conf.local_udp_port = port; 231 /* Open UDP socket */ 232 err = udp_sock_create(net, &udp_conf, &sock); 233 if (err < 0) 234 return ERR_PTR(err); 235 236 udp_allow_gso(sock->sk); 237 return sock; 238 } 239 240 /* Create new listen socket if needed */ 241 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 242 { 243 struct udp_tunnel_sock_cfg tunnel_cfg; 244 struct socket *sock; 245 246 sock = bareudp_create_sock(bareudp->net, port); 247 if (IS_ERR(sock)) 248 return PTR_ERR(sock); 249 250 /* Mark socket as an encapsulation socket */ 251 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 252 tunnel_cfg.sk_user_data = bareudp; 253 tunnel_cfg.encap_type = 1; 254 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 255 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 256 tunnel_cfg.encap_destroy = NULL; 257 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 258 259 rcu_assign_pointer(bareudp->sock, sock); 260 return 0; 261 } 262 263 static int bareudp_open(struct net_device *dev) 264 { 265 struct bareudp_dev *bareudp = netdev_priv(dev); 266 int ret = 0; 267 268 ret = bareudp_socket_create(bareudp, bareudp->port); 269 return ret; 270 } 271 272 static void bareudp_sock_release(struct bareudp_dev *bareudp) 273 { 274 struct socket *sock; 275 276 sock = bareudp->sock; 277 rcu_assign_pointer(bareudp->sock, NULL); 278 synchronize_net(); 279 udp_tunnel_sock_release(sock); 280 } 281 282 static int bareudp_stop(struct net_device *dev) 283 { 284 struct bareudp_dev *bareudp = netdev_priv(dev); 285 286 bareudp_sock_release(bareudp); 287 return 0; 288 } 289 290 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 291 struct bareudp_dev *bareudp, 292 const struct ip_tunnel_info *info) 293 { 294 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 295 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 296 struct socket *sock = rcu_dereference(bareudp->sock); 297 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 298 const struct ip_tunnel_key *key = &info->key; 299 struct rtable *rt; 300 __be16 sport, df; 301 int min_headroom; 302 __u8 tos, ttl; 303 __be32 saddr; 304 int err; 305 306 if (!sock) 307 return -ESHUTDOWN; 308 309 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, 310 0, 0, key->tos, 311 use_cache ? 312 (struct dst_cache *)&info->dst_cache : NULL); 313 314 if (IS_ERR(rt)) 315 return PTR_ERR(rt); 316 317 skb_tunnel_check_pmtu(skb, &rt->dst, 318 BAREUDP_IPV4_HLEN + info->options_len, false); 319 320 sport = udp_flow_src_port(bareudp->net, skb, 321 bareudp->sport_min, USHRT_MAX, 322 true); 323 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 324 ttl = key->ttl; 325 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 326 skb_scrub_packet(skb, xnet); 327 328 err = -ENOSPC; 329 if (!skb_pull(skb, skb_network_offset(skb))) 330 goto free_dst; 331 332 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 333 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 334 335 err = skb_cow_head(skb, min_headroom); 336 if (unlikely(err)) 337 goto free_dst; 338 339 err = udp_tunnel_handle_offloads(skb, udp_sum); 340 if (err) 341 goto free_dst; 342 343 skb_set_inner_protocol(skb, bareudp->ethertype); 344 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 345 tos, ttl, df, sport, bareudp->port, 346 !net_eq(bareudp->net, dev_net(bareudp->dev)), 347 !(info->key.tun_flags & TUNNEL_CSUM)); 348 return 0; 349 350 free_dst: 351 dst_release(&rt->dst); 352 return err; 353 } 354 355 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 356 struct bareudp_dev *bareudp, 357 const struct ip_tunnel_info *info) 358 { 359 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 360 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 361 struct socket *sock = rcu_dereference(bareudp->sock); 362 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 363 const struct ip_tunnel_key *key = &info->key; 364 struct dst_entry *dst = NULL; 365 struct in6_addr saddr, daddr; 366 int min_headroom; 367 __u8 prio, ttl; 368 __be16 sport; 369 int err; 370 371 if (!sock) 372 return -ESHUTDOWN; 373 374 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, 375 IPPROTO_UDP, use_cache); 376 if (IS_ERR(dst)) 377 return PTR_ERR(dst); 378 379 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 380 false); 381 382 sport = udp_flow_src_port(bareudp->net, skb, 383 bareudp->sport_min, USHRT_MAX, 384 true); 385 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 386 ttl = key->ttl; 387 388 skb_scrub_packet(skb, xnet); 389 390 err = -ENOSPC; 391 if (!skb_pull(skb, skb_network_offset(skb))) 392 goto free_dst; 393 394 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 395 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 396 397 err = skb_cow_head(skb, min_headroom); 398 if (unlikely(err)) 399 goto free_dst; 400 401 err = udp_tunnel_handle_offloads(skb, udp_sum); 402 if (err) 403 goto free_dst; 404 405 daddr = info->key.u.ipv6.dst; 406 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 407 &saddr, &daddr, prio, ttl, 408 info->key.label, sport, bareudp->port, 409 !(info->key.tun_flags & TUNNEL_CSUM)); 410 return 0; 411 412 free_dst: 413 dst_release(dst); 414 return err; 415 } 416 417 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 418 { 419 if (bareudp->ethertype == proto) 420 return true; 421 422 if (!bareudp->multi_proto_mode) 423 return false; 424 425 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 426 proto == htons(ETH_P_MPLS_MC)) 427 return true; 428 429 if (bareudp->ethertype == htons(ETH_P_IP) && 430 proto == htons(ETH_P_IPV6)) 431 return true; 432 433 return false; 434 } 435 436 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 437 { 438 struct bareudp_dev *bareudp = netdev_priv(dev); 439 struct ip_tunnel_info *info = NULL; 440 int err; 441 442 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 443 err = -EINVAL; 444 goto tx_error; 445 } 446 447 info = skb_tunnel_info(skb); 448 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 449 err = -EINVAL; 450 goto tx_error; 451 } 452 453 rcu_read_lock(); 454 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6) 455 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 456 else 457 err = bareudp_xmit_skb(skb, dev, bareudp, info); 458 459 rcu_read_unlock(); 460 461 if (likely(!err)) 462 return NETDEV_TX_OK; 463 tx_error: 464 dev_kfree_skb(skb); 465 466 if (err == -ELOOP) 467 dev->stats.collisions++; 468 else if (err == -ENETUNREACH) 469 dev->stats.tx_carrier_errors++; 470 471 dev->stats.tx_errors++; 472 return NETDEV_TX_OK; 473 } 474 475 static int bareudp_fill_metadata_dst(struct net_device *dev, 476 struct sk_buff *skb) 477 { 478 struct ip_tunnel_info *info = skb_tunnel_info(skb); 479 struct bareudp_dev *bareudp = netdev_priv(dev); 480 bool use_cache; 481 482 use_cache = ip_tunnel_dst_cache_usable(skb, info); 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, 0, 0, info->key.tos, 490 use_cache ? &info->dst_cache : NULL); 491 if (IS_ERR(rt)) 492 return PTR_ERR(rt); 493 494 ip_rt_put(rt); 495 info->key.u.ipv4.src = saddr; 496 } else if (ip_tunnel_info_af(info) == AF_INET6) { 497 struct dst_entry *dst; 498 struct in6_addr saddr; 499 struct socket *sock = rcu_dereference(bareudp->sock); 500 501 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, 502 &saddr, info, IPPROTO_UDP, 503 use_cache); 504 if (IS_ERR(dst)) 505 return PTR_ERR(dst); 506 507 dst_release(dst); 508 info->key.u.ipv6.src = saddr; 509 } else { 510 return -EINVAL; 511 } 512 513 info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 514 bareudp->sport_min, 515 USHRT_MAX, true); 516 info->key.tp_dst = bareudp->port; 517 return 0; 518 } 519 520 static 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_get_stats64 = dev_get_tstats64, 527 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 528 }; 529 530 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 531 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 532 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 533 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 534 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 535 }; 536 537 /* Info for udev, that this is a virtual tunnel endpoint */ 538 static const struct device_type bareudp_type = { 539 .name = "bareudp", 540 }; 541 542 /* Initialize the device structure. */ 543 static void bareudp_setup(struct net_device *dev) 544 { 545 dev->netdev_ops = &bareudp_netdev_ops; 546 dev->needs_free_netdev = true; 547 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 548 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 549 dev->features |= NETIF_F_RXCSUM; 550 dev->features |= NETIF_F_LLTX; 551 dev->features |= NETIF_F_GSO_SOFTWARE; 552 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 553 dev->hw_features |= NETIF_F_RXCSUM; 554 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 555 dev->hard_header_len = 0; 556 dev->addr_len = 0; 557 dev->mtu = ETH_DATA_LEN; 558 dev->min_mtu = IPV4_MIN_MTU; 559 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 560 dev->type = ARPHRD_NONE; 561 netif_keep_dst(dev); 562 dev->priv_flags |= IFF_NO_QUEUE; 563 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 564 } 565 566 static 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 } 576 577 static 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 } 602 603 static 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 } 614 615 static 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 } 650 651 static 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 } 663 664 static 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 } 671 672 static 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; 692 693 err_unconfig: 694 bareudp_dellink(dev, NULL); 695 return err; 696 } 697 698 static 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 } 706 707 static 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; 722 723 nla_put_failure: 724 return -EMSGSIZE; 725 } 726 727 static 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 }; 739 740 static __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 } 747 748 static 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 } 756 757 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 758 { 759 struct net *net; 760 LIST_HEAD(list); 761 762 rtnl_lock(); 763 list_for_each_entry(net, net_list, exit_list) 764 bareudp_destroy_tunnels(net, &list); 765 766 /* unregister the devices gathered above */ 767 unregister_netdevice_many(&list); 768 rtnl_unlock(); 769 } 770 771 static struct pernet_operations bareudp_net_ops = { 772 .init = bareudp_init_net, 773 .exit_batch = bareudp_exit_batch_net, 774 .id = &bareudp_net_id, 775 .size = sizeof(struct bareudp_net), 776 }; 777 778 static int __init bareudp_init_module(void) 779 { 780 int rc; 781 782 rc = register_pernet_subsys(&bareudp_net_ops); 783 if (rc) 784 goto out1; 785 786 rc = rtnl_link_register(&bareudp_link_ops); 787 if (rc) 788 goto out2; 789 790 return 0; 791 out2: 792 unregister_pernet_subsys(&bareudp_net_ops); 793 out1: 794 return rc; 795 } 796 late_initcall(bareudp_init_module); 797 798 static void __exit bareudp_cleanup_module(void) 799 { 800 rtnl_link_unregister(&bareudp_link_ops); 801 unregister_pernet_subsys(&bareudp_net_ops); 802 } 803 module_exit(bareudp_cleanup_module); 804 805 MODULE_ALIAS_RTNL_LINK("bareudp"); 806 MODULE_LICENSE("GPL"); 807 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 808 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 809