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 = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sock, 0, &saddr, 375 key, 0, 0, key->tos, 376 use_cache ? 377 (struct dst_cache *) &info->dst_cache : NULL); 378 if (IS_ERR(dst)) 379 return PTR_ERR(dst); 380 381 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 382 false); 383 384 sport = udp_flow_src_port(bareudp->net, skb, 385 bareudp->sport_min, USHRT_MAX, 386 true); 387 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 388 ttl = key->ttl; 389 390 skb_scrub_packet(skb, xnet); 391 392 err = -ENOSPC; 393 if (!skb_pull(skb, skb_network_offset(skb))) 394 goto free_dst; 395 396 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 397 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 398 399 err = skb_cow_head(skb, min_headroom); 400 if (unlikely(err)) 401 goto free_dst; 402 403 err = udp_tunnel_handle_offloads(skb, udp_sum); 404 if (err) 405 goto free_dst; 406 407 daddr = info->key.u.ipv6.dst; 408 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 409 &saddr, &daddr, prio, ttl, 410 info->key.label, sport, bareudp->port, 411 !(info->key.tun_flags & TUNNEL_CSUM)); 412 return 0; 413 414 free_dst: 415 dst_release(dst); 416 return err; 417 } 418 419 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 420 { 421 if (bareudp->ethertype == proto) 422 return true; 423 424 if (!bareudp->multi_proto_mode) 425 return false; 426 427 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 428 proto == htons(ETH_P_MPLS_MC)) 429 return true; 430 431 if (bareudp->ethertype == htons(ETH_P_IP) && 432 proto == htons(ETH_P_IPV6)) 433 return true; 434 435 return false; 436 } 437 438 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 439 { 440 struct bareudp_dev *bareudp = netdev_priv(dev); 441 struct ip_tunnel_info *info = NULL; 442 int err; 443 444 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 445 err = -EINVAL; 446 goto tx_error; 447 } 448 449 info = skb_tunnel_info(skb); 450 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 451 err = -EINVAL; 452 goto tx_error; 453 } 454 455 rcu_read_lock(); 456 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6) 457 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 458 else 459 err = bareudp_xmit_skb(skb, dev, bareudp, info); 460 461 rcu_read_unlock(); 462 463 if (likely(!err)) 464 return NETDEV_TX_OK; 465 tx_error: 466 dev_kfree_skb(skb); 467 468 if (err == -ELOOP) 469 dev->stats.collisions++; 470 else if (err == -ENETUNREACH) 471 dev->stats.tx_carrier_errors++; 472 473 dev->stats.tx_errors++; 474 return NETDEV_TX_OK; 475 } 476 477 static int bareudp_fill_metadata_dst(struct net_device *dev, 478 struct sk_buff *skb) 479 { 480 struct ip_tunnel_info *info = skb_tunnel_info(skb); 481 struct bareudp_dev *bareudp = netdev_priv(dev); 482 bool use_cache; 483 484 use_cache = ip_tunnel_dst_cache_usable(skb, info); 485 486 if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) { 487 struct rtable *rt; 488 __be32 saddr; 489 490 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, 491 &info->key, 0, 0, info->key.tos, 492 use_cache ? &info->dst_cache : NULL); 493 if (IS_ERR(rt)) 494 return PTR_ERR(rt); 495 496 ip_rt_put(rt); 497 info->key.u.ipv4.src = saddr; 498 } else if (ip_tunnel_info_af(info) == AF_INET6) { 499 struct dst_entry *dst; 500 struct in6_addr saddr; 501 struct socket *sock = rcu_dereference(bareudp->sock); 502 503 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sock, 504 0, &saddr, &info->key, 505 0, 0, info->key.tos, 506 use_cache ? &info->dst_cache : NULL); 507 if (IS_ERR(dst)) 508 return PTR_ERR(dst); 509 510 dst_release(dst); 511 info->key.u.ipv6.src = saddr; 512 } else { 513 return -EINVAL; 514 } 515 516 info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 517 bareudp->sport_min, 518 USHRT_MAX, true); 519 info->key.tp_dst = bareudp->port; 520 return 0; 521 } 522 523 static const struct net_device_ops bareudp_netdev_ops = { 524 .ndo_init = bareudp_init, 525 .ndo_uninit = bareudp_uninit, 526 .ndo_open = bareudp_open, 527 .ndo_stop = bareudp_stop, 528 .ndo_start_xmit = bareudp_xmit, 529 .ndo_get_stats64 = dev_get_tstats64, 530 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 531 }; 532 533 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 534 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 535 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 536 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 537 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 538 }; 539 540 /* Info for udev, that this is a virtual tunnel endpoint */ 541 static const struct device_type bareudp_type = { 542 .name = "bareudp", 543 }; 544 545 /* Initialize the device structure. */ 546 static void bareudp_setup(struct net_device *dev) 547 { 548 dev->netdev_ops = &bareudp_netdev_ops; 549 dev->needs_free_netdev = true; 550 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 551 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 552 dev->features |= NETIF_F_RXCSUM; 553 dev->features |= NETIF_F_LLTX; 554 dev->features |= NETIF_F_GSO_SOFTWARE; 555 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 556 dev->hw_features |= NETIF_F_RXCSUM; 557 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 558 dev->hard_header_len = 0; 559 dev->addr_len = 0; 560 dev->mtu = ETH_DATA_LEN; 561 dev->min_mtu = IPV4_MIN_MTU; 562 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 563 dev->type = ARPHRD_NONE; 564 netif_keep_dst(dev); 565 dev->priv_flags |= IFF_NO_QUEUE; 566 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 567 } 568 569 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 570 struct netlink_ext_ack *extack) 571 { 572 if (!data) { 573 NL_SET_ERR_MSG(extack, 574 "Not enough attributes provided to perform the operation"); 575 return -EINVAL; 576 } 577 return 0; 578 } 579 580 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 581 struct netlink_ext_ack *extack) 582 { 583 memset(conf, 0, sizeof(*conf)); 584 585 if (!data[IFLA_BAREUDP_PORT]) { 586 NL_SET_ERR_MSG(extack, "port not specified"); 587 return -EINVAL; 588 } 589 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 590 NL_SET_ERR_MSG(extack, "ethertype not specified"); 591 return -EINVAL; 592 } 593 594 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 595 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 596 597 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 598 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 599 600 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 601 conf->multi_proto_mode = true; 602 603 return 0; 604 } 605 606 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 607 const struct bareudp_conf *conf) 608 { 609 struct bareudp_dev *bareudp, *t = NULL; 610 611 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 612 if (conf->port == bareudp->port) 613 t = bareudp; 614 } 615 return t; 616 } 617 618 static int bareudp_configure(struct net *net, struct net_device *dev, 619 struct bareudp_conf *conf, 620 struct netlink_ext_ack *extack) 621 { 622 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 623 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 624 int err; 625 626 bareudp->net = net; 627 bareudp->dev = dev; 628 t = bareudp_find_dev(bn, conf); 629 if (t) { 630 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); 631 return -EBUSY; 632 } 633 634 if (conf->multi_proto_mode && 635 (conf->ethertype != htons(ETH_P_MPLS_UC) && 636 conf->ethertype != htons(ETH_P_IP))) { 637 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); 638 return -EINVAL; 639 } 640 641 bareudp->port = conf->port; 642 bareudp->ethertype = conf->ethertype; 643 bareudp->sport_min = conf->sport_min; 644 bareudp->multi_proto_mode = conf->multi_proto_mode; 645 646 err = register_netdevice(dev); 647 if (err) 648 return err; 649 650 list_add(&bareudp->next, &bn->bareudp_list); 651 return 0; 652 } 653 654 static int bareudp_link_config(struct net_device *dev, 655 struct nlattr *tb[]) 656 { 657 int err; 658 659 if (tb[IFLA_MTU]) { 660 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 661 if (err) 662 return err; 663 } 664 return 0; 665 } 666 667 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 668 { 669 struct bareudp_dev *bareudp = netdev_priv(dev); 670 671 list_del(&bareudp->next); 672 unregister_netdevice_queue(dev, head); 673 } 674 675 static int bareudp_newlink(struct net *net, struct net_device *dev, 676 struct nlattr *tb[], struct nlattr *data[], 677 struct netlink_ext_ack *extack) 678 { 679 struct bareudp_conf conf; 680 int err; 681 682 err = bareudp2info(data, &conf, extack); 683 if (err) 684 return err; 685 686 err = bareudp_configure(net, dev, &conf, extack); 687 if (err) 688 return err; 689 690 err = bareudp_link_config(dev, tb); 691 if (err) 692 goto err_unconfig; 693 694 return 0; 695 696 err_unconfig: 697 bareudp_dellink(dev, NULL); 698 return err; 699 } 700 701 static size_t bareudp_get_size(const struct net_device *dev) 702 { 703 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 704 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 705 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 706 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 707 0; 708 } 709 710 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 711 { 712 struct bareudp_dev *bareudp = netdev_priv(dev); 713 714 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 715 goto nla_put_failure; 716 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 717 goto nla_put_failure; 718 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 719 goto nla_put_failure; 720 if (bareudp->multi_proto_mode && 721 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 722 goto nla_put_failure; 723 724 return 0; 725 726 nla_put_failure: 727 return -EMSGSIZE; 728 } 729 730 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 731 .kind = "bareudp", 732 .maxtype = IFLA_BAREUDP_MAX, 733 .policy = bareudp_policy, 734 .priv_size = sizeof(struct bareudp_dev), 735 .setup = bareudp_setup, 736 .validate = bareudp_validate, 737 .newlink = bareudp_newlink, 738 .dellink = bareudp_dellink, 739 .get_size = bareudp_get_size, 740 .fill_info = bareudp_fill_info, 741 }; 742 743 static __net_init int bareudp_init_net(struct net *net) 744 { 745 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 746 747 INIT_LIST_HEAD(&bn->bareudp_list); 748 return 0; 749 } 750 751 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 752 { 753 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 754 struct bareudp_dev *bareudp, *next; 755 756 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 757 unregister_netdevice_queue(bareudp->dev, head); 758 } 759 760 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 761 { 762 struct net *net; 763 LIST_HEAD(list); 764 765 rtnl_lock(); 766 list_for_each_entry(net, net_list, exit_list) 767 bareudp_destroy_tunnels(net, &list); 768 769 /* unregister the devices gathered above */ 770 unregister_netdevice_many(&list); 771 rtnl_unlock(); 772 } 773 774 static struct pernet_operations bareudp_net_ops = { 775 .init = bareudp_init_net, 776 .exit_batch = bareudp_exit_batch_net, 777 .id = &bareudp_net_id, 778 .size = sizeof(struct bareudp_net), 779 }; 780 781 static int __init bareudp_init_module(void) 782 { 783 int rc; 784 785 rc = register_pernet_subsys(&bareudp_net_ops); 786 if (rc) 787 goto out1; 788 789 rc = rtnl_link_register(&bareudp_link_ops); 790 if (rc) 791 goto out2; 792 793 return 0; 794 out2: 795 unregister_pernet_subsys(&bareudp_net_ops); 796 out1: 797 return rc; 798 } 799 late_initcall(bareudp_init_module); 800 801 static void __exit bareudp_cleanup_module(void) 802 { 803 rtnl_link_unregister(&bareudp_link_ops); 804 unregister_pernet_subsys(&bareudp_net_ops); 805 } 806 module_exit(bareudp_cleanup_module); 807 808 MODULE_ALIAS_RTNL_LINK("bareudp"); 809 MODULE_LICENSE("GPL"); 810 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 811 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 812