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 sock __rcu *sk; 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_dstats_rx_dropped(bareudp->dev); 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_dstats_rx_dropped(bareudp->dev); 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_dstats_rx_dropped(bareudp->dev); 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_dstats_rx_dropped(bareudp->dev); 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_dstats_rx_dropped(bareudp->dev); 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_dstats_rx_dropped(bareudp->dev); 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_dstats_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 sock *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->sk; 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 sock *sk; 259 260 sk = bareudp_create_sock(bareudp->net, port); 261 if (IS_ERR(sk)) 262 return PTR_ERR(sk); 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, sk, &tunnel_cfg); 272 273 rcu_assign_pointer(bareudp->sk, sk); 274 return 0; 275 } 276 277 static int bareudp_open(struct net_device *dev) 278 { 279 struct bareudp_dev *bareudp = netdev_priv(dev); 280 281 return bareudp_socket_create(bareudp, bareudp->port); 282 } 283 284 static void bareudp_sock_release(struct bareudp_dev *bareudp) 285 { 286 struct sock *sk; 287 288 sk = rtnl_dereference(bareudp->sk); 289 rcu_assign_pointer(bareudp->sk, NULL); 290 udp_tunnel_sock_release(sk); 291 } 292 293 static int bareudp_stop(struct net_device *dev) 294 { 295 struct bareudp_dev *bareudp = netdev_priv(dev); 296 297 bareudp_sock_release(bareudp); 298 return 0; 299 } 300 301 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 302 struct bareudp_dev *bareudp, 303 const struct ip_tunnel_info *info) 304 { 305 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 306 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 307 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 308 struct sock *sk = rcu_dereference(bareudp->sk); 309 const struct ip_tunnel_key *key = &info->key; 310 struct rtable *rt; 311 __be16 sport, df; 312 int min_headroom; 313 __u8 tos, ttl; 314 __be32 saddr; 315 int err; 316 317 if (skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) 318 return -EINVAL; 319 320 if (!sk) 321 return -ESHUTDOWN; 322 323 sport = udp_flow_src_port(bareudp->net, skb, 324 bareudp->sport_min, USHRT_MAX, 325 true); 326 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, 327 sport, bareudp->port, key->tos, 328 use_cache ? 329 (struct dst_cache *)&info->dst_cache : NULL); 330 331 if (IS_ERR(rt)) 332 return PTR_ERR(rt); 333 334 skb_tunnel_check_pmtu(skb, &rt->dst, 335 BAREUDP_IPV4_HLEN + info->options_len, false); 336 337 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 338 ttl = key->ttl; 339 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 340 htons(IP_DF) : 0; 341 skb_scrub_packet(skb, xnet); 342 343 err = -ENOSPC; 344 if (!skb_pull(skb, skb_network_offset(skb))) 345 goto free_dst; 346 347 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 348 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 349 350 err = skb_cow_head(skb, min_headroom); 351 if (unlikely(err)) 352 goto free_dst; 353 354 err = udp_tunnel_handle_offloads(skb, udp_sum); 355 if (err) 356 goto free_dst; 357 358 skb_set_inner_protocol(skb, bareudp->ethertype); 359 udp_tunnel_xmit_skb(rt, sk, skb, saddr, info->key.u.ipv4.dst, 360 tos, ttl, df, sport, bareudp->port, 361 !net_eq(bareudp->net, dev_net(bareudp->dev)), 362 !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags), 363 0); 364 return 0; 365 366 free_dst: 367 dst_release(&rt->dst); 368 return err; 369 } 370 371 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 372 struct bareudp_dev *bareudp, 373 const struct ip_tunnel_info *info) 374 { 375 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 376 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 377 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 378 struct sock *sk = rcu_dereference(bareudp->sk); 379 const struct ip_tunnel_key *key = &info->key; 380 struct dst_entry *dst = NULL; 381 struct in6_addr saddr, daddr; 382 int min_headroom; 383 __u8 prio, ttl; 384 __be16 sport; 385 int err; 386 387 if (skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) 388 return -EINVAL; 389 390 if (!sk) 391 return -ESHUTDOWN; 392 393 sport = udp_flow_src_port(bareudp->net, skb, 394 bareudp->sport_min, USHRT_MAX, 395 true); 396 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sk, 0, &saddr, 397 key, sport, bareudp->port, key->tos, 398 use_cache ? 399 (struct dst_cache *) &info->dst_cache : NULL); 400 if (IS_ERR(dst)) 401 return PTR_ERR(dst); 402 403 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, 404 false); 405 406 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 407 ttl = key->ttl; 408 409 skb_scrub_packet(skb, xnet); 410 411 err = -ENOSPC; 412 if (!skb_pull(skb, skb_network_offset(skb))) 413 goto free_dst; 414 415 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 416 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); 417 418 err = skb_cow_head(skb, min_headroom); 419 if (unlikely(err)) 420 goto free_dst; 421 422 err = udp_tunnel_handle_offloads(skb, udp_sum); 423 if (err) 424 goto free_dst; 425 426 daddr = info->key.u.ipv6.dst; 427 udp_tunnel6_xmit_skb(dst, sk, skb, dev, 428 &saddr, &daddr, prio, ttl, 429 info->key.label, sport, bareudp->port, 430 !test_bit(IP_TUNNEL_CSUM_BIT, 431 info->key.tun_flags), 432 0); 433 return 0; 434 435 free_dst: 436 dst_release(dst); 437 return err; 438 } 439 440 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) 441 { 442 if (bareudp->ethertype == proto) 443 return true; 444 445 if (!bareudp->multi_proto_mode) 446 return false; 447 448 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && 449 proto == htons(ETH_P_MPLS_MC)) 450 return true; 451 452 if (bareudp->ethertype == htons(ETH_P_IP) && 453 proto == htons(ETH_P_IPV6)) 454 return true; 455 456 return false; 457 } 458 459 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 460 { 461 struct bareudp_dev *bareudp = netdev_priv(dev); 462 struct ip_tunnel_info *info = NULL; 463 int err; 464 465 if (!bareudp_proto_valid(bareudp, skb->protocol)) { 466 err = -EINVAL; 467 goto tx_error; 468 } 469 470 info = skb_tunnel_info(skb); 471 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 472 err = -EINVAL; 473 goto tx_error; 474 } 475 476 rcu_read_lock(); 477 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6) 478 err = bareudp6_xmit_skb(skb, dev, bareudp, info); 479 else 480 err = bareudp_xmit_skb(skb, dev, bareudp, info); 481 482 rcu_read_unlock(); 483 484 if (likely(!err)) 485 return NETDEV_TX_OK; 486 tx_error: 487 dev_kfree_skb(skb); 488 489 if (err == -ELOOP) 490 DEV_STATS_INC(dev, collisions); 491 else if (err == -ENETUNREACH) 492 DEV_STATS_INC(dev, tx_carrier_errors); 493 494 DEV_STATS_INC(dev, tx_errors); 495 return NETDEV_TX_OK; 496 } 497 498 static int bareudp_fill_metadata_dst(struct net_device *dev, 499 struct sk_buff *skb) 500 { 501 struct ip_tunnel_info *info = skb_tunnel_info(skb); 502 struct bareudp_dev *bareudp = netdev_priv(dev); 503 bool use_cache; 504 __be16 sport; 505 506 use_cache = ip_tunnel_dst_cache_usable(skb, info); 507 sport = udp_flow_src_port(bareudp->net, skb, 508 bareudp->sport_min, USHRT_MAX, 509 true); 510 511 if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) { 512 struct rtable *rt; 513 __be32 saddr; 514 515 rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, 516 &info->key, sport, bareudp->port, 517 info->key.tos, 518 use_cache ? &info->dst_cache : NULL); 519 if (IS_ERR(rt)) 520 return PTR_ERR(rt); 521 522 ip_rt_put(rt); 523 info->key.u.ipv4.src = saddr; 524 } else if (ip_tunnel_info_af(info) == AF_INET6) { 525 struct dst_entry *dst; 526 struct in6_addr saddr; 527 struct sock *sk; 528 529 sk = rcu_dereference(bareudp->sk); 530 if (!sk) 531 return -ESHUTDOWN; 532 533 dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sk, 534 0, &saddr, &info->key, 535 sport, bareudp->port, info->key.tos, 536 use_cache ? &info->dst_cache : NULL); 537 if (IS_ERR(dst)) 538 return PTR_ERR(dst); 539 540 dst_release(dst); 541 info->key.u.ipv6.src = saddr; 542 } else { 543 return -EINVAL; 544 } 545 546 info->key.tp_src = sport; 547 info->key.tp_dst = bareudp->port; 548 return 0; 549 } 550 551 static const struct net_device_ops bareudp_netdev_ops = { 552 .ndo_init = bareudp_init, 553 .ndo_uninit = bareudp_uninit, 554 .ndo_open = bareudp_open, 555 .ndo_stop = bareudp_stop, 556 .ndo_start_xmit = bareudp_xmit, 557 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 558 }; 559 560 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 561 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 562 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 563 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 564 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 565 }; 566 567 /* Info for udev, that this is a virtual tunnel endpoint */ 568 static const struct device_type bareudp_type = { 569 .name = "bareudp", 570 }; 571 572 /* Initialize the device structure. */ 573 static void bareudp_setup(struct net_device *dev) 574 { 575 dev->netdev_ops = &bareudp_netdev_ops; 576 dev->needs_free_netdev = true; 577 SET_NETDEV_DEVTYPE(dev, &bareudp_type); 578 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 579 dev->features |= NETIF_F_RXCSUM; 580 dev->features |= NETIF_F_GSO_SOFTWARE; 581 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 582 dev->hw_features |= NETIF_F_RXCSUM; 583 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 584 dev->hard_header_len = 0; 585 dev->addr_len = 0; 586 dev->mtu = ETH_DATA_LEN; 587 dev->min_mtu = IPV4_MIN_MTU; 588 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 589 dev->type = ARPHRD_NONE; 590 netif_keep_dst(dev); 591 dev->priv_flags |= IFF_NO_QUEUE; 592 dev->lltx = true; 593 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 594 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 595 } 596 597 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 598 struct netlink_ext_ack *extack) 599 { 600 if (!data) { 601 NL_SET_ERR_MSG(extack, 602 "Not enough attributes provided to perform the operation"); 603 return -EINVAL; 604 } 605 return 0; 606 } 607 608 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 609 struct netlink_ext_ack *extack) 610 { 611 memset(conf, 0, sizeof(*conf)); 612 613 if (!data[IFLA_BAREUDP_PORT]) { 614 NL_SET_ERR_MSG(extack, "port not specified"); 615 return -EINVAL; 616 } 617 if (!data[IFLA_BAREUDP_ETHERTYPE]) { 618 NL_SET_ERR_MSG(extack, "ethertype not specified"); 619 return -EINVAL; 620 } 621 622 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 623 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 624 625 if (data[IFLA_BAREUDP_SRCPORT_MIN]) 626 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 627 628 if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) 629 conf->multi_proto_mode = true; 630 631 return 0; 632 } 633 634 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 635 const struct bareudp_conf *conf) 636 { 637 struct bareudp_dev *bareudp, *t = NULL; 638 639 list_for_each_entry(bareudp, &bn->bareudp_list, next) { 640 if (conf->port == bareudp->port) 641 t = bareudp; 642 } 643 return t; 644 } 645 646 static int bareudp_configure(struct net *net, struct net_device *dev, 647 struct bareudp_conf *conf, 648 struct netlink_ext_ack *extack) 649 { 650 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 651 struct bareudp_dev *t, *bareudp = netdev_priv(dev); 652 int err; 653 654 bareudp->net = net; 655 bareudp->dev = dev; 656 t = bareudp_find_dev(bn, conf); 657 if (t) { 658 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); 659 return -EBUSY; 660 } 661 662 if (conf->multi_proto_mode && 663 (conf->ethertype != htons(ETH_P_MPLS_UC) && 664 conf->ethertype != htons(ETH_P_IP))) { 665 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); 666 return -EINVAL; 667 } 668 669 bareudp->port = conf->port; 670 bareudp->ethertype = conf->ethertype; 671 bareudp->sport_min = conf->sport_min; 672 bareudp->multi_proto_mode = conf->multi_proto_mode; 673 674 err = register_netdevice(dev); 675 if (err) 676 return err; 677 678 list_add(&bareudp->next, &bn->bareudp_list); 679 return 0; 680 } 681 682 static int bareudp_link_config(struct net_device *dev, 683 struct nlattr *tb[]) 684 { 685 int err; 686 687 if (tb[IFLA_MTU]) { 688 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 689 if (err) 690 return err; 691 } 692 return 0; 693 } 694 695 static void bareudp_dellink(struct net_device *dev, struct list_head *head) 696 { 697 struct bareudp_dev *bareudp = netdev_priv(dev); 698 699 list_del(&bareudp->next); 700 unregister_netdevice_queue(dev, head); 701 } 702 703 static int bareudp_newlink(struct net_device *dev, 704 struct rtnl_newlink_params *params, 705 struct netlink_ext_ack *extack) 706 { 707 struct net *link_net = rtnl_newlink_link_net(params); 708 struct nlattr **data = params->data; 709 struct nlattr **tb = params->tb; 710 struct bareudp_conf conf; 711 int err; 712 713 err = bareudp2info(data, &conf, extack); 714 if (err) 715 return err; 716 717 err = bareudp_configure(link_net, dev, &conf, extack); 718 if (err) 719 return err; 720 721 err = bareudp_link_config(dev, tb); 722 if (err) 723 goto err_unconfig; 724 725 return 0; 726 727 err_unconfig: 728 bareudp_dellink(dev, NULL); 729 return err; 730 } 731 732 static size_t bareudp_get_size(const struct net_device *dev) 733 { 734 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 735 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 736 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 737 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 738 0; 739 } 740 741 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 742 { 743 struct bareudp_dev *bareudp = netdev_priv(dev); 744 745 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 746 goto nla_put_failure; 747 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 748 goto nla_put_failure; 749 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 750 goto nla_put_failure; 751 if (bareudp->multi_proto_mode && 752 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 753 goto nla_put_failure; 754 755 return 0; 756 757 nla_put_failure: 758 return -EMSGSIZE; 759 } 760 761 static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 762 .kind = "bareudp", 763 .maxtype = IFLA_BAREUDP_MAX, 764 .policy = bareudp_policy, 765 .priv_size = sizeof(struct bareudp_dev), 766 .setup = bareudp_setup, 767 .validate = bareudp_validate, 768 .newlink = bareudp_newlink, 769 .dellink = bareudp_dellink, 770 .get_size = bareudp_get_size, 771 .fill_info = bareudp_fill_info, 772 }; 773 774 static __net_init int bareudp_init_net(struct net *net) 775 { 776 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 777 778 INIT_LIST_HEAD(&bn->bareudp_list); 779 return 0; 780 } 781 782 static void __net_exit bareudp_exit_rtnl_net(struct net *net, 783 struct list_head *dev_kill_list) 784 { 785 struct bareudp_net *bn = net_generic(net, bareudp_net_id); 786 struct bareudp_dev *bareudp, *next; 787 788 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 789 bareudp_dellink(bareudp->dev, dev_kill_list); 790 } 791 792 static struct pernet_operations bareudp_net_ops = { 793 .init = bareudp_init_net, 794 .exit_rtnl = bareudp_exit_rtnl_net, 795 .id = &bareudp_net_id, 796 .size = sizeof(struct bareudp_net), 797 }; 798 799 static int __init bareudp_init_module(void) 800 { 801 int rc; 802 803 rc = register_pernet_subsys(&bareudp_net_ops); 804 if (rc) 805 goto out1; 806 807 rc = rtnl_link_register(&bareudp_link_ops); 808 if (rc) 809 goto out2; 810 811 return 0; 812 out2: 813 unregister_pernet_subsys(&bareudp_net_ops); 814 out1: 815 return rc; 816 } 817 late_initcall(bareudp_init_module); 818 819 static void __exit bareudp_cleanup_module(void) 820 { 821 rtnl_link_unregister(&bareudp_link_ops); 822 unregister_pernet_subsys(&bareudp_net_ops); 823 } 824 module_exit(bareudp_cleanup_module); 825 826 MODULE_ALIAS_RTNL_LINK("bareudp"); 827 MODULE_LICENSE("GPL"); 828 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 829 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 830