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 IP_TUNNEL_DECLARE_FLAGS(key) = { }; 65 struct bareudp_dev *bareudp; 66 unsigned short family; 67 unsigned int len; 68 __be16 proto; 69 void *oiph; 70 int err; 71 int nh; 72 73 bareudp = rcu_dereference_sk_user_data(sk); 74 if (!bareudp) 75 goto drop; 76 77 if (skb->protocol == htons(ETH_P_IP)) 78 family = AF_INET; 79 else 80 family = AF_INET6; 81 82 if (bareudp->ethertype == htons(ETH_P_IP)) { 83 __u8 ipversion; 84 85 if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion, 86 sizeof(ipversion))) { 87 DEV_STATS_INC(bareudp->dev, rx_dropped); 88 goto drop; 89 } 90 ipversion >>= 4; 91 92 if (ipversion == 4) { 93 proto = htons(ETH_P_IP); 94 } else if (ipversion == 6 && bareudp->multi_proto_mode) { 95 proto = htons(ETH_P_IPV6); 96 } else { 97 DEV_STATS_INC(bareudp->dev, rx_dropped); 98 goto drop; 99 } 100 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { 101 struct iphdr *tunnel_hdr; 102 103 tunnel_hdr = (struct iphdr *)skb_network_header(skb); 104 if (tunnel_hdr->version == 4) { 105 if (!ipv4_is_multicast(tunnel_hdr->daddr)) { 106 proto = bareudp->ethertype; 107 } else if (bareudp->multi_proto_mode && 108 ipv4_is_multicast(tunnel_hdr->daddr)) { 109 proto = htons(ETH_P_MPLS_MC); 110 } else { 111 DEV_STATS_INC(bareudp->dev, rx_dropped); 112 goto drop; 113 } 114 } else { 115 int addr_type; 116 struct ipv6hdr *tunnel_hdr_v6; 117 118 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); 119 addr_type = 120 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); 121 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 122 proto = bareudp->ethertype; 123 } else if (bareudp->multi_proto_mode && 124 (addr_type & IPV6_ADDR_MULTICAST)) { 125 proto = htons(ETH_P_MPLS_MC); 126 } else { 127 DEV_STATS_INC(bareudp->dev, rx_dropped); 128 goto drop; 129 } 130 } 131 } else { 132 proto = bareudp->ethertype; 133 } 134 135 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, 136 proto, 137 !net_eq(bareudp->net, 138 dev_net(bareudp->dev)))) { 139 DEV_STATS_INC(bareudp->dev, rx_dropped); 140 goto drop; 141 } 142 143 __set_bit(IP_TUNNEL_KEY_BIT, key); 144 145 tun_dst = udp_tun_rx_dst(skb, family, key, 0, 0); 146 if (!tun_dst) { 147 DEV_STATS_INC(bareudp->dev, rx_dropped); 148 goto drop; 149 } 150 skb_dst_set(skb, &tun_dst->dst); 151 skb->dev = bareudp->dev; 152 skb_reset_mac_header(skb); 153 154 /* Save offset of outer header relative to skb->head, 155 * because we are going to reset the network header to the inner header 156 * and might change skb->head. 157 */ 158 nh = skb_network_header(skb) - skb->head; 159 160 skb_reset_network_header(skb); 161 162 if (!pskb_inet_may_pull(skb)) { 163 DEV_STATS_INC(bareudp->dev, rx_length_errors); 164 DEV_STATS_INC(bareudp->dev, rx_errors); 165 goto drop; 166 } 167 168 /* Get the outer header. */ 169 oiph = skb->head + nh; 170 171 if (!ipv6_mod_enabled() || family == AF_INET) 172 err = IP_ECN_decapsulate(oiph, skb); 173 else 174 err = IP6_ECN_decapsulate(oiph, skb); 175 176 if (unlikely(err)) { 177 if (log_ecn_error) { 178 if (!ipv6_mod_enabled() || family == AF_INET) 179 net_info_ratelimited("non-ECT from %pI4 " 180 "with TOS=%#x\n", 181 &((struct iphdr *)oiph)->saddr, 182 ((struct iphdr *)oiph)->tos); 183 else 184 net_info_ratelimited("non-ECT from %pI6\n", 185 &((struct ipv6hdr *)oiph)->saddr); 186 } 187 if (err > 1) { 188 DEV_STATS_INC(bareudp->dev, rx_frame_errors); 189 DEV_STATS_INC(bareudp->dev, rx_errors); 190 goto drop; 191 } 192 } 193 194 len = skb->len; 195 err = gro_cells_receive(&bareudp->gro_cells, skb); 196 if (likely(err == NET_RX_SUCCESS)) 197 dev_sw_netstats_rx_add(bareudp->dev, len); 198 199 return 0; 200 drop: 201 /* Consume bad packet */ 202 kfree_skb(skb); 203 204 return 0; 205 } 206 207 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 208 { 209 return 0; 210 } 211 212 static int bareudp_init(struct net_device *dev) 213 { 214 struct bareudp_dev *bareudp = netdev_priv(dev); 215 int err; 216 217 err = gro_cells_init(&bareudp->gro_cells, dev); 218 if (err) 219 return err; 220 221 return 0; 222 } 223 224 static void bareudp_uninit(struct net_device *dev) 225 { 226 struct bareudp_dev *bareudp = netdev_priv(dev); 227 228 gro_cells_destroy(&bareudp->gro_cells); 229 } 230 231 static struct socket *bareudp_create_sock(struct net *net, __be16 port) 232 { 233 struct udp_port_cfg udp_conf; 234 struct socket *sock; 235 int err; 236 237 memset(&udp_conf, 0, sizeof(udp_conf)); 238 239 if (ipv6_mod_enabled()) 240 udp_conf.family = AF_INET6; 241 else 242 udp_conf.family = AF_INET; 243 244 udp_conf.local_udp_port = port; 245 /* Open UDP socket */ 246 err = udp_sock_create(net, &udp_conf, &sock); 247 if (err < 0) 248 return ERR_PTR(err); 249 250 udp_allow_gso(sock->sk); 251 return sock; 252 } 253 254 /* Create new listen socket if needed */ 255 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 256 { 257 struct udp_tunnel_sock_cfg tunnel_cfg; 258 struct socket *sock; 259 260 sock = bareudp_create_sock(bareudp->net, port); 261 if (IS_ERR(sock)) 262 return PTR_ERR(sock); 263 264 /* Mark socket as an encapsulation socket */ 265 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 266 tunnel_cfg.sk_user_data = bareudp; 267 tunnel_cfg.encap_type = 1; 268 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 269 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 270 tunnel_cfg.encap_destroy = NULL; 271 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 272 273 rcu_assign_pointer(bareudp->sock, sock); 274 return 0; 275 } 276 277 static int bareudp_open(struct net_device *dev) 278 { 279 struct bareudp_dev *bareudp = netdev_priv(dev); 280 int ret = 0; 281 282 ret = bareudp_socket_create(bareudp, bareudp->port); 283 return ret; 284 } 285 286 static void bareudp_sock_release(struct bareudp_dev *bareudp) 287 { 288 struct socket *sock; 289 290 sock = bareudp->sock; 291 rcu_assign_pointer(bareudp->sock, NULL); 292 synchronize_net(); 293 udp_tunnel_sock_release(sock); 294 } 295 296 static int bareudp_stop(struct net_device *dev) 297 { 298 struct bareudp_dev *bareudp = netdev_priv(dev); 299 300 bareudp_sock_release(bareudp); 301 return 0; 302 } 303 304 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 305 struct bareudp_dev *bareudp, 306 const struct ip_tunnel_info *info) 307 { 308 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 309 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 310 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 311 struct socket *sock = rcu_dereference(bareudp->sock); 312 const struct ip_tunnel_key *key = &info->key; 313 struct rtable *rt; 314 __be16 sport, df; 315 int min_headroom; 316 __u8 tos, ttl; 317 __be32 saddr; 318 int err; 319 320 if (!skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) 321 return -EINVAL; 322 323 if (!sock) 324 return -ESHUTDOWN; 325 326 sport = udp_flow_src_port(bareudp->net, skb, 327 bareudp->sport_min, USHRT_MAX, 328 true); 329 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, 330 sport, bareudp->port, key->tos, 331 use_cache ? 332 (struct dst_cache *)&info->dst_cache : NULL); 333 334 if (IS_ERR(rt)) 335 return PTR_ERR(rt); 336 337 skb_tunnel_check_pmtu(skb, &rt->dst, 338 BAREUDP_IPV4_HLEN + info->options_len, false); 339 340 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 341 ttl = key->ttl; 342 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 343 htons(IP_DF) : 0; 344 skb_scrub_packet(skb, xnet); 345 346 err = -ENOSPC; 347 if (!skb_pull(skb, skb_network_offset(skb))) 348 goto free_dst; 349 350 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 351 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 352 353 err = skb_cow_head(skb, min_headroom); 354 if (unlikely(err)) 355 goto free_dst; 356 357 err = udp_tunnel_handle_offloads(skb, udp_sum); 358 if (err) 359 goto free_dst; 360 361 skb_set_inner_protocol(skb, bareudp->ethertype); 362 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 363 tos, ttl, df, sport, bareudp->port, 364 !net_eq(bareudp->net, dev_net(bareudp->dev)), 365 !test_bit(IP_TUNNEL_CSUM_BIT, 366 info->key.tun_flags)); 367 return 0; 368 369 free_dst: 370 dst_release(&rt->dst); 371 return err; 372 } 373 374 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 375 struct bareudp_dev *bareudp, 376 const struct ip_tunnel_info *info) 377 { 378 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 379 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 380 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 381 struct socket *sock = rcu_dereference(bareudp->sock); 382 const struct ip_tunnel_key *key = &info->key; 383 struct dst_entry *dst = NULL; 384 struct in6_addr saddr, daddr; 385 int min_headroom; 386 __u8 prio, ttl; 387 __be16 sport; 388 int err; 389 390 if (!skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) 391 return -EINVAL; 392 393 if (!sock) 394 return -ESHUTDOWN; 395 396 sport = udp_flow_src_port(bareudp->net, skb, 397 bareudp->sport_min, USHRT_MAX, 398 true); 399 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sock, 0, &saddr, 400 key, sport, bareudp->port, key->tos, 401 use_cache ? 402 (struct dst_cache *) &info->dst_cache : NULL); 403 if (IS_ERR(dst)) 404 return PTR_ERR(dst); 405 406 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 407 false); 408 409 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 410 ttl = key->ttl; 411 412 skb_scrub_packet(skb, xnet); 413 414 err = -ENOSPC; 415 if (!skb_pull(skb, skb_network_offset(skb))) 416 goto free_dst; 417 418 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 419 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 420 421 err = skb_cow_head(skb, min_headroom); 422 if (unlikely(err)) 423 goto free_dst; 424 425 err = udp_tunnel_handle_offloads(skb, udp_sum); 426 if (err) 427 goto free_dst; 428 429 daddr = info->key.u.ipv6.dst; 430 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 431 &saddr, &daddr, prio, ttl, 432 info->key.label, sport, bareudp->port, 433 !test_bit(IP_TUNNEL_CSUM_BIT, 434 info->key.tun_flags)); 435 return 0; 436 437 free_dst: 438 dst_release(dst); 439 return err; 440 } 441 442 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 443 { 444 if (bareudp->ethertype == proto) 445 return true; 446 447 if (!bareudp->multi_proto_mode) 448 return false; 449 450 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 451 proto == htons(ETH_P_MPLS_MC)) 452 return true; 453 454 if (bareudp->ethertype == htons(ETH_P_IP) && 455 proto == htons(ETH_P_IPV6)) 456 return true; 457 458 return false; 459 } 460 461 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 462 { 463 struct bareudp_dev *bareudp = netdev_priv(dev); 464 struct ip_tunnel_info *info = NULL; 465 int err; 466 467 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 468 err = -EINVAL; 469 goto tx_error; 470 } 471 472 info = skb_tunnel_info(skb); 473 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 474 err = -EINVAL; 475 goto tx_error; 476 } 477 478 rcu_read_lock(); 479 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6) 480 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 481 else 482 err = bareudp_xmit_skb(skb, dev, bareudp, info); 483 484 rcu_read_unlock(); 485 486 if (likely(!err)) 487 return NETDEV_TX_OK; 488 tx_error: 489 dev_kfree_skb(skb); 490 491 if (err == -ELOOP) 492 DEV_STATS_INC(dev, collisions); 493 else if (err == -ENETUNREACH) 494 DEV_STATS_INC(dev, tx_carrier_errors); 495 496 DEV_STATS_INC(dev, tx_errors); 497 return NETDEV_TX_OK; 498 } 499 500 static int bareudp_fill_metadata_dst(struct net_device *dev, 501 struct sk_buff *skb) 502 { 503 struct ip_tunnel_info *info = skb_tunnel_info(skb); 504 struct bareudp_dev *bareudp = netdev_priv(dev); 505 bool use_cache; 506 __be16 sport; 507 508 use_cache = ip_tunnel_dst_cache_usable(skb, info); 509 sport = udp_flow_src_port(bareudp->net, skb, 510 bareudp->sport_min, USHRT_MAX, 511 true); 512 513 if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) { 514 struct rtable *rt; 515 __be32 saddr; 516 517 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, 518 &info->key, sport, bareudp->port, 519 info->key.tos, 520 use_cache ? &info->dst_cache : NULL); 521 if (IS_ERR(rt)) 522 return PTR_ERR(rt); 523 524 ip_rt_put(rt); 525 info->key.u.ipv4.src = saddr; 526 } else if (ip_tunnel_info_af(info) == AF_INET6) { 527 struct dst_entry *dst; 528 struct in6_addr saddr; 529 struct socket *sock = rcu_dereference(bareudp->sock); 530 531 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sock, 532 0, &saddr, &info->key, 533 sport, bareudp->port, info->key.tos, 534 use_cache ? &info->dst_cache : NULL); 535 if (IS_ERR(dst)) 536 return PTR_ERR(dst); 537 538 dst_release(dst); 539 info->key.u.ipv6.src = saddr; 540 } else { 541 return -EINVAL; 542 } 543 544 info->key.tp_src = sport; 545 info->key.tp_dst = bareudp->port; 546 return 0; 547 } 548 549 static const struct net_device_ops bareudp_netdev_ops = { 550 .ndo_init = bareudp_init, 551 .ndo_uninit = bareudp_uninit, 552 .ndo_open = bareudp_open, 553 .ndo_stop = bareudp_stop, 554 .ndo_start_xmit = bareudp_xmit, 555 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 556 }; 557 558 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 559 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 560 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 561 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 562 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 563 }; 564 565 /* Info for udev, that this is a virtual tunnel endpoint */ 566 static const struct device_type bareudp_type = { 567 .name = "bareudp", 568 }; 569 570 /* Initialize the device structure. */ 571 static void bareudp_setup(struct net_device *dev) 572 { 573 dev->netdev_ops = &bareudp_netdev_ops; 574 dev->needs_free_netdev = true; 575 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 576 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 577 dev->features |= NETIF_F_RXCSUM; 578 dev->features |= NETIF_F_GSO_SOFTWARE; 579 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 580 dev->hw_features |= NETIF_F_RXCSUM; 581 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 582 dev->hard_header_len = 0; 583 dev->addr_len = 0; 584 dev->mtu = ETH_DATA_LEN; 585 dev->min_mtu = IPV4_MIN_MTU; 586 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 587 dev->type = ARPHRD_NONE; 588 netif_keep_dst(dev); 589 dev->priv_flags |= IFF_NO_QUEUE; 590 dev->lltx = true; 591 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 592 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 593 } 594 595 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 596 struct netlink_ext_ack *extack) 597 { 598 if (!data) { 599 NL_SET_ERR_MSG(extack, 600 "Not enough attributes provided to perform the operation"); 601 return -EINVAL; 602 } 603 return 0; 604 } 605 606 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 607 struct netlink_ext_ack *extack) 608 { 609 memset(conf, 0, sizeof(*conf)); 610 611 if (!data[IFLA_BAREUDP_PORT]) { 612 NL_SET_ERR_MSG(extack, "port not specified"); 613 return -EINVAL; 614 } 615 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 616 NL_SET_ERR_MSG(extack, "ethertype not specified"); 617 return -EINVAL; 618 } 619 620 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 621 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 622 623 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 624 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 625 626 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 627 conf->multi_proto_mode = true; 628 629 return 0; 630 } 631 632 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 633 const struct bareudp_conf *conf) 634 { 635 struct bareudp_dev *bareudp, *t = NULL; 636 637 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 638 if (conf->port == bareudp->port) 639 t = bareudp; 640 } 641 return t; 642 } 643 644 static int bareudp_configure(struct net *net, struct net_device *dev, 645 struct bareudp_conf *conf, 646 struct netlink_ext_ack *extack) 647 { 648 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 649 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 650 int err; 651 652 bareudp->net = net; 653 bareudp->dev = dev; 654 t = bareudp_find_dev(bn, conf); 655 if (t) { 656 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); 657 return -EBUSY; 658 } 659 660 if (conf->multi_proto_mode && 661 (conf->ethertype != htons(ETH_P_MPLS_UC) && 662 conf->ethertype != htons(ETH_P_IP))) { 663 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); 664 return -EINVAL; 665 } 666 667 bareudp->port = conf->port; 668 bareudp->ethertype = conf->ethertype; 669 bareudp->sport_min = conf->sport_min; 670 bareudp->multi_proto_mode = conf->multi_proto_mode; 671 672 err = register_netdevice(dev); 673 if (err) 674 return err; 675 676 list_add(&bareudp->next, &bn->bareudp_list); 677 return 0; 678 } 679 680 static int bareudp_link_config(struct net_device *dev, 681 struct nlattr *tb[]) 682 { 683 int err; 684 685 if (tb[IFLA_MTU]) { 686 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 687 if (err) 688 return err; 689 } 690 return 0; 691 } 692 693 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 694 { 695 struct bareudp_dev *bareudp = netdev_priv(dev); 696 697 list_del(&bareudp->next); 698 unregister_netdevice_queue(dev, head); 699 } 700 701 static int bareudp_newlink(struct net *net, struct net_device *dev, 702 struct nlattr *tb[], struct nlattr *data[], 703 struct netlink_ext_ack *extack) 704 { 705 struct bareudp_conf conf; 706 int err; 707 708 err = bareudp2info(data, &conf, extack); 709 if (err) 710 return err; 711 712 err = bareudp_configure(net, dev, &conf, extack); 713 if (err) 714 return err; 715 716 err = bareudp_link_config(dev, tb); 717 if (err) 718 goto err_unconfig; 719 720 return 0; 721 722 err_unconfig: 723 bareudp_dellink(dev, NULL); 724 return err; 725 } 726 727 static size_t bareudp_get_size(const struct net_device *dev) 728 { 729 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 730 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 731 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 732 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 733 0; 734 } 735 736 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 737 { 738 struct bareudp_dev *bareudp = netdev_priv(dev); 739 740 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 741 goto nla_put_failure; 742 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 743 goto nla_put_failure; 744 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 745 goto nla_put_failure; 746 if (bareudp->multi_proto_mode && 747 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 748 goto nla_put_failure; 749 750 return 0; 751 752 nla_put_failure: 753 return -EMSGSIZE; 754 } 755 756 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 757 .kind = "bareudp", 758 .maxtype = IFLA_BAREUDP_MAX, 759 .policy = bareudp_policy, 760 .priv_size = sizeof(struct bareudp_dev), 761 .setup = bareudp_setup, 762 .validate = bareudp_validate, 763 .newlink = bareudp_newlink, 764 .dellink = bareudp_dellink, 765 .get_size = bareudp_get_size, 766 .fill_info = bareudp_fill_info, 767 }; 768 769 static __net_init int bareudp_init_net(struct net *net) 770 { 771 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 772 773 INIT_LIST_HEAD(&bn->bareudp_list); 774 return 0; 775 } 776 777 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 778 { 779 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 780 struct bareudp_dev *bareudp, *next; 781 782 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 783 unregister_netdevice_queue(bareudp->dev, head); 784 } 785 786 static void __net_exit bareudp_exit_batch_rtnl(struct list_head *net_list, 787 struct list_head *dev_kill_list) 788 { 789 struct net *net; 790 791 list_for_each_entry(net, net_list, exit_list) 792 bareudp_destroy_tunnels(net, dev_kill_list); 793 } 794 795 static struct pernet_operations bareudp_net_ops = { 796 .init = bareudp_init_net, 797 .exit_batch_rtnl = bareudp_exit_batch_rtnl, 798 .id = &bareudp_net_id, 799 .size = sizeof(struct bareudp_net), 800 }; 801 802 static int __init bareudp_init_module(void) 803 { 804 int rc; 805 806 rc = register_pernet_subsys(&bareudp_net_ops); 807 if (rc) 808 goto out1; 809 810 rc = rtnl_link_register(&bareudp_link_ops); 811 if (rc) 812 goto out2; 813 814 return 0; 815 out2: 816 unregister_pernet_subsys(&bareudp_net_ops); 817 out1: 818 return rc; 819 } 820 late_initcall(bareudp_init_module); 821 822 static void __exit bareudp_cleanup_module(void) 823 { 824 rtnl_link_unregister(&bareudp_link_ops); 825 unregister_pernet_subsys(&bareudp_net_ops); 826 } 827 module_exit(bareudp_cleanup_module); 828 829 MODULE_ALIAS_RTNL_LINK("bareudp"); 830 MODULE_LICENSE("GPL"); 831 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 832 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 833