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 struct mutex lock; 40 }; 41 42 struct bareudp_conf { 43 __be16 ethertype; 44 __be16 port; 45 u16 sport_min; 46 bool multi_proto_mode; 47 }; 48 49 /* Pseudo network device */ 50 struct bareudp_dev { 51 struct net *net; /* netns for packet i/o */ 52 struct net_device *dev; /* netdev for bareudp tunnel */ 53 __be16 ethertype; 54 __be16 port; 55 u16 sport_min; 56 bool multi_proto_mode; 57 struct sock __rcu *sk; 58 struct list_head next; /* bareudp node on namespace list */ 59 struct gro_cells gro_cells; 60 }; 61 62 static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 63 { 64 struct metadata_dst *tun_dst = NULL; 65 IP_TUNNEL_DECLARE_FLAGS(key) = { }; 66 struct bareudp_dev *bareudp; 67 unsigned short family; 68 unsigned int len; 69 __be16 proto; 70 void *oiph; 71 int err; 72 int nh; 73 74 bareudp = rcu_dereference_sk_user_data(sk); 75 if (!bareudp) 76 goto drop; 77 78 if (skb->protocol == htons(ETH_P_IP)) 79 family = AF_INET; 80 else 81 family = AF_INET6; 82 83 if (bareudp->ethertype == htons(ETH_P_IP)) { 84 __u8 ipversion; 85 86 if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion, 87 sizeof(ipversion))) { 88 dev_dstats_rx_dropped(bareudp->dev); 89 goto drop; 90 } 91 ipversion >>= 4; 92 93 if (ipversion == 4) { 94 proto = htons(ETH_P_IP); 95 } else if (ipversion == 6 && bareudp->multi_proto_mode) { 96 proto = htons(ETH_P_IPV6); 97 } else { 98 dev_dstats_rx_dropped(bareudp->dev); 99 goto drop; 100 } 101 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { 102 struct iphdr *tunnel_hdr; 103 104 tunnel_hdr = (struct iphdr *)skb_network_header(skb); 105 if (tunnel_hdr->version == 4) { 106 if (!ipv4_is_multicast(tunnel_hdr->daddr)) { 107 proto = bareudp->ethertype; 108 } else if (bareudp->multi_proto_mode && 109 ipv4_is_multicast(tunnel_hdr->daddr)) { 110 proto = htons(ETH_P_MPLS_MC); 111 } else { 112 dev_dstats_rx_dropped(bareudp->dev); 113 goto drop; 114 } 115 } else { 116 int addr_type; 117 struct ipv6hdr *tunnel_hdr_v6; 118 119 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); 120 addr_type = 121 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); 122 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 123 proto = bareudp->ethertype; 124 } else if (bareudp->multi_proto_mode && 125 (addr_type & IPV6_ADDR_MULTICAST)) { 126 proto = htons(ETH_P_MPLS_MC); 127 } else { 128 dev_dstats_rx_dropped(bareudp->dev); 129 goto drop; 130 } 131 } 132 } else { 133 proto = bareudp->ethertype; 134 } 135 136 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, 137 proto, 138 !net_eq(bareudp->net, 139 dev_net(bareudp->dev)))) { 140 dev_dstats_rx_dropped(bareudp->dev); 141 goto drop; 142 } 143 144 __set_bit(IP_TUNNEL_KEY_BIT, key); 145 146 tun_dst = udp_tun_rx_dst(skb, family, key, 0, 0); 147 if (!tun_dst) { 148 dev_dstats_rx_dropped(bareudp->dev); 149 goto drop; 150 } 151 skb_dst_set(skb, &tun_dst->dst); 152 skb->dev = bareudp->dev; 153 skb_reset_mac_header(skb); 154 155 /* Save offset of outer header relative to skb->head, 156 * because we are going to reset the network header to the inner header 157 * and might change skb->head. 158 */ 159 nh = skb_network_header(skb) - skb->head; 160 161 skb_reset_network_header(skb); 162 163 if (!pskb_inet_may_pull(skb)) { 164 DEV_STATS_INC(bareudp->dev, rx_length_errors); 165 DEV_STATS_INC(bareudp->dev, rx_errors); 166 goto drop; 167 } 168 169 /* Get the outer header. */ 170 oiph = skb->head + nh; 171 172 if (!ipv6_mod_enabled() || family == AF_INET) 173 err = IP_ECN_decapsulate(oiph, skb); 174 else 175 err = IP6_ECN_decapsulate(oiph, skb); 176 177 if (unlikely(err)) { 178 if (log_ecn_error) { 179 if (!ipv6_mod_enabled() || family == AF_INET) 180 net_info_ratelimited("non-ECT from %pI4 " 181 "with TOS=%#x\n", 182 &((struct iphdr *)oiph)->saddr, 183 ((struct iphdr *)oiph)->tos); 184 else 185 net_info_ratelimited("non-ECT from %pI6\n", 186 &((struct ipv6hdr *)oiph)->saddr); 187 } 188 if (err > 1) { 189 DEV_STATS_INC(bareudp->dev, rx_frame_errors); 190 DEV_STATS_INC(bareudp->dev, rx_errors); 191 goto drop; 192 } 193 } 194 195 len = skb->len; 196 err = gro_cells_receive(&bareudp->gro_cells, skb); 197 if (likely(err == NET_RX_SUCCESS)) 198 dev_dstats_rx_add(bareudp->dev, len); 199 200 return 0; 201 drop: 202 /* Consume bad packet */ 203 kfree_skb(skb); 204 205 return 0; 206 } 207 208 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 209 { 210 return 0; 211 } 212 213 static int bareudp_init(struct net_device *dev) 214 { 215 struct bareudp_dev *bareudp = netdev_priv(dev); 216 int err; 217 218 err = gro_cells_init(&bareudp->gro_cells, dev); 219 if (err) 220 return err; 221 222 return 0; 223 } 224 225 static void bareudp_uninit(struct net_device *dev) 226 { 227 struct bareudp_dev *bareudp = netdev_priv(dev); 228 229 gro_cells_destroy(&bareudp->gro_cells); 230 } 231 232 static struct sock *bareudp_create_sock(struct net *net, __be16 port) 233 { 234 struct udp_port_cfg udp_conf; 235 struct socket *sock; 236 int err; 237 238 memset(&udp_conf, 0, sizeof(udp_conf)); 239 240 if (ipv6_mod_enabled()) 241 udp_conf.family = AF_INET6; 242 else 243 udp_conf.family = AF_INET; 244 245 udp_conf.local_udp_port = port; 246 /* Open UDP socket */ 247 err = udp_sock_create(net, &udp_conf, &sock); 248 if (err < 0) 249 return ERR_PTR(err); 250 251 udp_allow_gso(sock->sk); 252 return sock->sk; 253 } 254 255 /* Create new listen socket if needed */ 256 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 257 { 258 struct udp_tunnel_sock_cfg tunnel_cfg; 259 struct sock *sk; 260 261 sk = bareudp_create_sock(bareudp->net, port); 262 if (IS_ERR(sk)) 263 return PTR_ERR(sk); 264 265 /* Mark socket as an encapsulation socket */ 266 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 267 tunnel_cfg.sk_user_data = bareudp; 268 tunnel_cfg.encap_type = 1; 269 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 270 tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 271 tunnel_cfg.encap_destroy = NULL; 272 setup_udp_tunnel_sock(bareudp->net, sk, &tunnel_cfg); 273 274 rcu_assign_pointer(bareudp->sk, sk); 275 return 0; 276 } 277 278 static int bareudp_open(struct net_device *dev) 279 { 280 struct bareudp_dev *bareudp = netdev_priv(dev); 281 282 return bareudp_socket_create(bareudp, bareudp->port); 283 } 284 285 static void bareudp_sock_release(struct bareudp_dev *bareudp) 286 { 287 struct sock *sk; 288 289 sk = rtnl_dereference(bareudp->sk); 290 rcu_assign_pointer(bareudp->sk, NULL); 291 udp_tunnel_sock_release(sk); 292 } 293 294 static int bareudp_stop(struct net_device *dev) 295 { 296 struct bareudp_dev *bareudp = netdev_priv(dev); 297 298 bareudp_sock_release(bareudp); 299 return 0; 300 } 301 302 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 303 struct bareudp_dev *bareudp, 304 const struct ip_tunnel_info *info) 305 { 306 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 307 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 308 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 309 struct sock *sk = rcu_dereference(bareudp->sk); 310 const struct ip_tunnel_key *key = &info->key; 311 struct rtable *rt; 312 __be16 sport, df; 313 int min_headroom; 314 __u8 tos, ttl; 315 __be32 saddr; 316 int err; 317 318 if (skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) 319 return -EINVAL; 320 321 if (!sk) 322 return -ESHUTDOWN; 323 324 sport = udp_flow_src_port(bareudp->net, skb, 325 bareudp->sport_min, USHRT_MAX, 326 true); 327 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, 328 sport, bareudp->port, key->tos, 329 use_cache ? 330 (struct dst_cache *)&info->dst_cache : NULL); 331 332 if (IS_ERR(rt)) 333 return PTR_ERR(rt); 334 335 skb_tunnel_check_pmtu(skb, &rt->dst, 336 BAREUDP_IPV4_HLEN + info->options_len, false); 337 338 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 339 ttl = key->ttl; 340 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 341 htons(IP_DF) : 0; 342 skb_scrub_packet(skb, xnet); 343 344 err = -ENOSPC; 345 if (!skb_pull(skb, skb_network_offset(skb))) 346 goto free_dst; 347 348 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 349 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 350 351 err = skb_cow_head(skb, min_headroom); 352 if (unlikely(err)) 353 goto free_dst; 354 355 err = udp_tunnel_handle_offloads(skb, udp_sum); 356 if (err) 357 goto free_dst; 358 359 skb_set_inner_protocol(skb, skb->protocol); 360 udp_tunnel_xmit_skb(rt, sk, skb, saddr, info->key.u.ipv4.dst, 361 tos, ttl, df, sport, bareudp->port, 362 !net_eq(bareudp->net, dev_net(bareudp->dev)), 363 !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags), 364 0); 365 return 0; 366 367 free_dst: 368 dst_release(&rt->dst); 369 return err; 370 } 371 372 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 373 struct bareudp_dev *bareudp, 374 const struct ip_tunnel_info *info) 375 { 376 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 377 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 378 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 379 struct sock *sk = rcu_dereference(bareudp->sk); 380 const struct ip_tunnel_key *key = &info->key; 381 struct dst_entry *dst = NULL; 382 struct in6_addr saddr, daddr; 383 int min_headroom; 384 __u8 prio, ttl; 385 __be16 sport; 386 int err; 387 388 if (skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) 389 return -EINVAL; 390 391 if (!sk) 392 return -ESHUTDOWN; 393 394 sport = udp_flow_src_port(bareudp->net, skb, 395 bareudp->sport_min, USHRT_MAX, 396 true); 397 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sk, 0, &saddr, 398 key, sport, bareudp->port, key->tos, 399 use_cache ? 400 (struct dst_cache *) &info->dst_cache : NULL); 401 if (IS_ERR(dst)) 402 return PTR_ERR(dst); 403 404 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 405 false); 406 407 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 408 ttl = key->ttl; 409 410 skb_scrub_packet(skb, xnet); 411 412 err = -ENOSPC; 413 if (!skb_pull(skb, skb_network_offset(skb))) 414 goto free_dst; 415 416 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 417 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 418 419 err = skb_cow_head(skb, min_headroom); 420 if (unlikely(err)) 421 goto free_dst; 422 423 err = udp_tunnel_handle_offloads(skb, udp_sum); 424 if (err) 425 goto free_dst; 426 427 skb_set_inner_protocol(skb, skb->protocol); 428 daddr = info->key.u.ipv6.dst; 429 udp_tunnel6_xmit_skb(dst, sk, skb, dev, 430 &saddr, &daddr, prio, ttl, 431 info->key.label, sport, bareudp->port, 432 !test_bit(IP_TUNNEL_CSUM_BIT, 433 info->key.tun_flags), 434 0); 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 sock *sk; 530 531 sk = rcu_dereference(bareudp->sk); 532 if (!sk) 533 return -ESHUTDOWN; 534 535 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sk, 536 0, &saddr, &info->key, 537 sport, bareudp->port, info->key.tos, 538 use_cache ? &info->dst_cache : NULL); 539 if (IS_ERR(dst)) 540 return PTR_ERR(dst); 541 542 dst_release(dst); 543 info->key.u.ipv6.src = saddr; 544 } else { 545 return -EINVAL; 546 } 547 548 info->key.tp_src = sport; 549 info->key.tp_dst = bareudp->port; 550 return 0; 551 } 552 553 static const struct net_device_ops bareudp_netdev_ops = { 554 .ndo_init = bareudp_init, 555 .ndo_uninit = bareudp_uninit, 556 .ndo_open = bareudp_open, 557 .ndo_stop = bareudp_stop, 558 .ndo_start_xmit = bareudp_xmit, 559 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 560 }; 561 562 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 563 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 564 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 565 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 566 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 567 }; 568 569 /* Info for udev, that this is a virtual tunnel endpoint */ 570 static const struct device_type bareudp_type = { 571 .name = "bareudp", 572 }; 573 574 /* Initialize the device structure. */ 575 static void bareudp_setup(struct net_device *dev) 576 { 577 dev->netdev_ops = &bareudp_netdev_ops; 578 dev->needs_free_netdev = true; 579 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 580 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 581 dev->features |= NETIF_F_RXCSUM; 582 dev->features |= NETIF_F_GSO_SOFTWARE; 583 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 584 dev->hw_features |= NETIF_F_RXCSUM; 585 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 586 dev->hard_header_len = 0; 587 dev->addr_len = 0; 588 dev->mtu = ETH_DATA_LEN; 589 dev->min_mtu = IPV4_MIN_MTU; 590 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 591 dev->type = ARPHRD_NONE; 592 netif_keep_dst(dev); 593 dev->priv_flags |= IFF_NO_QUEUE; 594 dev->lltx = true; 595 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 596 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 597 } 598 599 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 600 struct netlink_ext_ack *extack) 601 { 602 if (!data) { 603 NL_SET_ERR_MSG(extack, 604 "Not enough attributes provided to perform the operation"); 605 return -EINVAL; 606 } 607 return 0; 608 } 609 610 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 611 struct netlink_ext_ack *extack) 612 { 613 memset(conf, 0, sizeof(*conf)); 614 615 if (!data[IFLA_BAREUDP_PORT]) { 616 NL_SET_ERR_MSG(extack, "port not specified"); 617 return -EINVAL; 618 } 619 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 620 NL_SET_ERR_MSG(extack, "ethertype not specified"); 621 return -EINVAL; 622 } 623 624 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 625 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 626 627 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 628 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 629 630 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 631 conf->multi_proto_mode = true; 632 633 return 0; 634 } 635 636 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 637 const struct bareudp_conf *conf) 638 { 639 struct bareudp_dev *bareudp, *t = NULL; 640 641 mutex_lock(&bn->lock); 642 643 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 644 if (conf->port == bareudp->port) 645 t = bareudp; 646 } 647 648 mutex_unlock(&bn->lock); 649 650 return t; 651 } 652 653 static int bareudp_configure(struct net *net, struct net_device *dev, 654 struct bareudp_conf *conf, 655 struct netlink_ext_ack *extack) 656 { 657 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 658 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 659 int err; 660 661 bareudp->net = net; 662 bareudp->dev = dev; 663 t = bareudp_find_dev(bn, conf); 664 if (t) { 665 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); 666 return -EBUSY; 667 } 668 669 if (conf->multi_proto_mode && 670 (conf->ethertype != htons(ETH_P_MPLS_UC) && 671 conf->ethertype != htons(ETH_P_IP))) { 672 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); 673 return -EINVAL; 674 } 675 676 bareudp->port = conf->port; 677 bareudp->ethertype = conf->ethertype; 678 bareudp->sport_min = conf->sport_min; 679 bareudp->multi_proto_mode = conf->multi_proto_mode; 680 681 err = register_netdevice(dev); 682 if (err) 683 return err; 684 685 mutex_lock(&bn->lock); 686 list_add(&bareudp->next, &bn->bareudp_list); 687 mutex_unlock(&bn->lock); 688 689 return 0; 690 } 691 692 static int bareudp_link_config(struct net_device *dev, 693 struct nlattr *tb[]) 694 { 695 int err; 696 697 if (tb[IFLA_MTU]) { 698 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 699 if (err) 700 return err; 701 } 702 return 0; 703 } 704 705 static void __bareudp_dellink(struct net *net, struct net_device *dev, 706 struct list_head *head) 707 { 708 struct bareudp_dev *bareudp = netdev_priv(dev); 709 710 list_del_init(&bareudp->next); 711 unregister_netdevice_queue_net(net, dev, head); 712 } 713 714 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 715 { 716 struct bareudp_dev *bareudp = netdev_priv(dev); 717 struct bareudp_net *bn; 718 719 bn = net_generic(bareudp->net, bareudp_net_id); 720 721 mutex_lock(&bn->lock); 722 if (!list_empty(&bareudp->next)) 723 __bareudp_dellink(dev_net(dev), dev, head); 724 mutex_unlock(&bn->lock); 725 } 726 727 static int bareudp_newlink(struct net_device *dev, 728 struct rtnl_newlink_params *params, 729 struct netlink_ext_ack *extack) 730 { 731 struct net *link_net = rtnl_newlink_link_net(params); 732 struct nlattr **data = params->data; 733 struct nlattr **tb = params->tb; 734 struct bareudp_conf conf; 735 int err; 736 737 err = bareudp2info(data, &conf, extack); 738 if (err) 739 return err; 740 741 err = bareudp_configure(link_net, dev, &conf, extack); 742 if (err) 743 return err; 744 745 err = bareudp_link_config(dev, tb); 746 if (err) 747 goto err_unconfig; 748 749 return 0; 750 751 err_unconfig: 752 bareudp_dellink(dev, NULL); 753 return err; 754 } 755 756 static size_t bareudp_get_size(const struct net_device *dev) 757 { 758 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 759 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 760 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 761 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 762 0; 763 } 764 765 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 766 { 767 struct bareudp_dev *bareudp = netdev_priv(dev); 768 769 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 770 goto nla_put_failure; 771 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 772 goto nla_put_failure; 773 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 774 goto nla_put_failure; 775 if (bareudp->multi_proto_mode && 776 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 777 goto nla_put_failure; 778 779 return 0; 780 781 nla_put_failure: 782 return -EMSGSIZE; 783 } 784 785 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 786 .kind = "bareudp", 787 .maxtype = IFLA_BAREUDP_MAX, 788 .policy = bareudp_policy, 789 .priv_size = sizeof(struct bareudp_dev), 790 .setup = bareudp_setup, 791 .validate = bareudp_validate, 792 .newlink = bareudp_newlink, 793 .dellink = bareudp_dellink, 794 .get_size = bareudp_get_size, 795 .fill_info = bareudp_fill_info, 796 }; 797 798 static __net_init int bareudp_init_net(struct net *net) 799 { 800 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 801 802 INIT_LIST_HEAD(&bn->bareudp_list); 803 mutex_init(&bn->lock); 804 805 return 0; 806 } 807 808 static void __net_exit bareudp_exit_rtnl_net(struct net *net, 809 struct list_head *dev_kill_list) 810 { 811 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 812 struct bareudp_dev *bareudp, *next; 813 814 mutex_lock(&bn->lock); 815 816 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 817 __bareudp_dellink(net, bareudp->dev, dev_kill_list); 818 819 mutex_unlock(&bn->lock); 820 } 821 822 static void __net_exit bareudp_exit_net(struct net *net) 823 { 824 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 825 826 WARN_ON_ONCE(!list_empty(&bn->bareudp_list)); 827 } 828 829 static struct pernet_operations bareudp_net_ops = { 830 .init = bareudp_init_net, 831 .exit_rtnl = bareudp_exit_rtnl_net, 832 .exit = bareudp_exit_net, 833 .id = &bareudp_net_id, 834 .size = sizeof(struct bareudp_net), 835 }; 836 837 static int __init bareudp_init_module(void) 838 { 839 int rc; 840 841 rc = register_pernet_subsys(&bareudp_net_ops); 842 if (rc) 843 goto out1; 844 845 rc = rtnl_link_register(&bareudp_link_ops); 846 if (rc) 847 goto out2; 848 849 return 0; 850 out2: 851 unregister_pernet_subsys(&bareudp_net_ops); 852 out1: 853 return rc; 854 } 855 late_initcall(bareudp_init_module); 856 857 static void __exit bareudp_cleanup_module(void) 858 { 859 rtnl_link_unregister(&bareudp_link_ops); 860 unregister_pernet_subsys(&bareudp_net_ops); 861 } 862 module_exit(bareudp_cleanup_module); 863 864 MODULE_ALIAS_RTNL_LINK("bareudp"); 865 MODULE_LICENSE("GPL"); 866 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 867 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 868