drivers/net/bareudp.c

   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 /* Pseudo network device */
  42 struct bareudp_dev {
  43         struct net         *net;        /* netns for packet i/o */
  44         struct net_device  *dev;        /* netdev for bareudp tunnel */
  45         __be16             ethertype;
  46         __be16             port;
  47         u16                sport_min;
  48         bool               multi_proto_mode;
  49         struct socket      __rcu *sock;
  50         struct list_head   next;        /* bareudp node  on namespace list */
  51         struct gro_cells   gro_cells;
  52 };
  53
  54 static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
  55 {
  56         struct metadata_dst *tun_dst = NULL;
  57         struct pcpu_sw_netstats *stats;
  58         struct bareudp_dev *bareudp;
  59         unsigned short family;
  60         unsigned int len;
  61         __be16 proto;
  62         void *oiph;
  63         int err;
  64
  65         bareudp = rcu_dereference_sk_user_data(sk);
  66         if (!bareudp)
  67                 goto drop;
  68
  69         if (skb->protocol ==  htons(ETH_P_IP))
  70                 family = AF_INET;
  71         else
  72                 family = AF_INET6;
  73
  74         if (bareudp->ethertype == htons(ETH_P_IP)) {
  75                 struct iphdr *iphdr;
  76
  77                 iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN);
  78                 if (iphdr->version == 4) {
  79                         proto = bareudp->ethertype;
  80                 } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) {
  81                         proto = htons(ETH_P_IPV6);
  82                 } else {
  83                         bareudp->dev->stats.rx_dropped++;
  84                         goto drop;
  85                 }
  86         } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
  87                 struct iphdr *tunnel_hdr;
  88
  89                 tunnel_hdr = (struct iphdr *)skb_network_header(skb);
  90                 if (tunnel_hdr->version == 4) {
  91                         if (!ipv4_is_multicast(tunnel_hdr->daddr)) {
  92                                 proto = bareudp->ethertype;
  93                         } else if (bareudp->multi_proto_mode &&
  94                                    ipv4_is_multicast(tunnel_hdr->daddr)) {
  95                                 proto = htons(ETH_P_MPLS_MC);
  96                         } else {
  97                                 bareudp->dev->stats.rx_dropped++;
  98                                 goto drop;
  99                         }
 100                 } else {
 101                         int addr_type;
 102                         struct ipv6hdr *tunnel_hdr_v6;
 103
 104                         tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb);
 105                         addr_type =
 106                         ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr);
 107                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 108                                 proto = bareudp->ethertype;
 109                         } else if (bareudp->multi_proto_mode &&
 110                                    (addr_type & IPV6_ADDR_MULTICAST)) {
 111                                 proto = htons(ETH_P_MPLS_MC);
 112                         } else {
 113                                 bareudp->dev->stats.rx_dropped++;
 114                                 goto drop;
 115                         }
 116                 }
 117         } else {
 118                 proto = bareudp->ethertype;
 119         }
 120
 121         if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
 122                                  proto,
 123                                  !net_eq(bareudp->net,
 124                                  dev_net(bareudp->dev)))) {
 125                 bareudp->dev->stats.rx_dropped++;
 126                 goto drop;
 127         }
 128
 129         tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
 130         if (!tun_dst) {
 131                 bareudp->dev->stats.rx_dropped++;
 132                 goto drop;
 133         }
 134         skb_dst_set(skb, &tun_dst->dst);
 135         skb->dev = bareudp->dev;
 136         oiph = skb_network_header(skb);
 137         skb_reset_network_header(skb);
 138
 139         if (family == AF_INET)
 140                 err = IP_ECN_decapsulate(oiph, skb);
 141 #if IS_ENABLED(CONFIG_IPV6)
 142         else
 143                 err = IP6_ECN_decapsulate(oiph, skb);
 144 #endif
 145
 146         if (unlikely(err)) {
 147                 if (log_ecn_error) {
 148                         if  (family == AF_INET)
 149                                 net_info_ratelimited("non-ECT from %pI4 "
 150                                                      "with TOS=%#x\n",
 151                                                      &((struct iphdr *)oiph)->saddr,
 152                                                      ((struct iphdr *)oiph)->tos);
 153 #if IS_ENABLED(CONFIG_IPV6)
 154                         else
 155                                 net_info_ratelimited("non-ECT from %pI6\n",
 156                                                      &((struct ipv6hdr *)oiph)->saddr);
 157 #endif
 158                 }
 159                 if (err > 1) {
 160                         ++bareudp->dev->stats.rx_frame_errors;
 161                         ++bareudp->dev->stats.rx_errors;
 162                         goto drop;
 163                 }
 164         }
 165
 166         len = skb->len;
 167         err = gro_cells_receive(&bareudp->gro_cells, skb);
 168         if (likely(err == NET_RX_SUCCESS)) {
 169                 stats = this_cpu_ptr(bareudp->dev->tstats);
 170                 u64_stats_update_begin(&stats->syncp);
 171                 stats->rx_packets++;
 172                 stats->rx_bytes += len;
 173                 u64_stats_update_end(&stats->syncp);
 174         }
 175         return 0;
 176 drop:
 177         /* Consume bad packet */
 178         kfree_skb(skb);
 179
 180         return 0;
 181 }
 182
 183 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
 184 {
 185         return 0;
 186 }
 187
 188 static int bareudp_init(struct net_device *dev)
 189 {
 190         struct bareudp_dev *bareudp = netdev_priv(dev);
 191         int err;
 192
 193         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 194         if (!dev->tstats)
 195                 return -ENOMEM;
 196
 197         err = gro_cells_init(&bareudp->gro_cells, dev);
 198         if (err) {
 199                 free_percpu(dev->tstats);
 200                 return err;
 201         }
 202         return 0;
 203 }
 204
 205 static void bareudp_uninit(struct net_device *dev)
 206 {
 207         struct bareudp_dev *bareudp = netdev_priv(dev);
 208
 209         gro_cells_destroy(&bareudp->gro_cells);
 210         free_percpu(dev->tstats);
 211 }
 212
 213 static struct socket *bareudp_create_sock(struct net *net, __be16 port)
 214 {
 215         struct udp_port_cfg udp_conf;
 216         struct socket *sock;
 217         int err;
 218
 219         memset(&udp_conf, 0, sizeof(udp_conf));
 220 #if IS_ENABLED(CONFIG_IPV6)
 221         udp_conf.family = AF_INET6;
 222 #else
 223         udp_conf.family = AF_INET;
 224 #endif
 225         udp_conf.local_udp_port = port;
 226         /* Open UDP socket */
 227         err = udp_sock_create(net, &udp_conf, &sock);
 228         if (err < 0)
 229                 return ERR_PTR(err);
 230
 231         return sock;
 232 }
 233
 234 /* Create new listen socket if needed */
 235 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
 236 {
 237         struct udp_tunnel_sock_cfg tunnel_cfg;
 238         struct socket *sock;
 239
 240         sock = bareudp_create_sock(bareudp->net, port);
 241         if (IS_ERR(sock))
 242                 return PTR_ERR(sock);
 243
 244         /* Mark socket as an encapsulation socket */
 245         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 246         tunnel_cfg.sk_user_data = bareudp;
 247         tunnel_cfg.encap_type = 1;
 248         tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
 249         tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
 250         tunnel_cfg.encap_destroy = NULL;
 251         setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
 252
 253         /* As the setup_udp_tunnel_sock does not call udp_encap_enable if the
 254          * socket type is v6 an explicit call to udp_encap_enable is needed.
 255          */
 256         if (sock->sk->sk_family == AF_INET6)
 257                 udp_encap_enable();
 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 = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
 310                                     IPPROTO_UDP, use_cache);
 311
 312         if (IS_ERR(rt))
 313                 return PTR_ERR(rt);
 314
 315         skb_tunnel_check_pmtu(skb, &rt->dst,
 316                               BAREUDP_IPV4_HLEN + info->options_len);
 317
 318         sport = udp_flow_src_port(bareudp->net, skb,
 319                                   bareudp->sport_min, USHRT_MAX,
 320                                   true);
 321         tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 322         ttl = key->ttl;
 323         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 324         skb_scrub_packet(skb, xnet);
 325
 326         err = -ENOSPC;
 327         if (!skb_pull(skb, skb_network_offset(skb)))
 328                 goto free_dst;
 329
 330         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
 331                 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
 332
 333         err = skb_cow_head(skb, min_headroom);
 334         if (unlikely(err))
 335                 goto free_dst;
 336
 337         err = udp_tunnel_handle_offloads(skb, udp_sum);
 338         if (err)
 339                 goto free_dst;
 340
 341         skb_set_inner_protocol(skb, bareudp->ethertype);
 342         udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
 343                             tos, ttl, df, sport, bareudp->port,
 344                             !net_eq(bareudp->net, dev_net(bareudp->dev)),
 345                             !(info->key.tun_flags & TUNNEL_CSUM));
 346         return 0;
 347
 348 free_dst:
 349         dst_release(&rt->dst);
 350         return err;
 351 }
 352
 353 #if IS_ENABLED(CONFIG_IPV6)
 354 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 355                              struct bareudp_dev *bareudp,
 356                              const struct ip_tunnel_info *info)
 357 {
 358         bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
 359         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 360         struct socket *sock  = rcu_dereference(bareudp->sock);
 361         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 362         const struct ip_tunnel_key *key = &info->key;
 363         struct dst_entry *dst = NULL;
 364         struct in6_addr saddr, daddr;
 365         int min_headroom;
 366         __u8 prio, ttl;
 367         __be16 sport;
 368         int err;
 369
 370         if (!sock)
 371                 return -ESHUTDOWN;
 372
 373         dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
 374                                     IPPROTO_UDP, use_cache);
 375         if (IS_ERR(dst))
 376                 return PTR_ERR(dst);
 377
 378         skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len);
 379
 380         sport = udp_flow_src_port(bareudp->net, skb,
 381                                   bareudp->sport_min, USHRT_MAX,
 382                                   true);
 383         prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 384         ttl = key->ttl;
 385
 386         skb_scrub_packet(skb, xnet);
 387
 388         err = -ENOSPC;
 389         if (!skb_pull(skb, skb_network_offset(skb)))
 390                 goto free_dst;
 391
 392         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 393                 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
 394
 395         err = skb_cow_head(skb, min_headroom);
 396         if (unlikely(err))
 397                 goto free_dst;
 398
 399         err = udp_tunnel_handle_offloads(skb, udp_sum);
 400         if (err)
 401                 goto free_dst;
 402
 403         daddr = info->key.u.ipv6.dst;
 404         udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
 405                              &saddr, &daddr, prio, ttl,
 406                              info->key.label, sport, bareudp->port,
 407                              !(info->key.tun_flags & TUNNEL_CSUM));
 408         return 0;
 409
 410 free_dst:
 411         dst_release(dst);
 412         return err;
 413 }
 414 #endif
 415
 416 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
 417 {
 418         struct bareudp_dev *bareudp = netdev_priv(dev);
 419         struct ip_tunnel_info *info = NULL;
 420         int err;
 421
 422         if (skb->protocol != bareudp->ethertype) {
 423                 if (!bareudp->multi_proto_mode ||
 424                     (skb->protocol !=  htons(ETH_P_MPLS_MC) &&
 425                      skb->protocol !=  htons(ETH_P_IPV6))) {
 426                         err = -EINVAL;
 427                         goto tx_error;
 428                 }
 429         }
 430
 431         info = skb_tunnel_info(skb);
 432         if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 433                 err = -EINVAL;
 434                 goto tx_error;
 435         }
 436
 437         rcu_read_lock();
 438 #if IS_ENABLED(CONFIG_IPV6)
 439         if (info->mode & IP_TUNNEL_INFO_IPV6)
 440                 err = bareudp6_xmit_skb(skb, dev, bareudp, info);
 441         else
 442 #endif
 443                 err = bareudp_xmit_skb(skb, dev, bareudp, info);
 444
 445         rcu_read_unlock();
 446
 447         if (likely(!err))
 448                 return NETDEV_TX_OK;
 449 tx_error:
 450         dev_kfree_skb(skb);
 451
 452         if (err == -ELOOP)
 453                 dev->stats.collisions++;
 454         else if (err == -ENETUNREACH)
 455                 dev->stats.tx_carrier_errors++;
 456
 457         dev->stats.tx_errors++;
 458         return NETDEV_TX_OK;
 459 }
 460
 461 static int bareudp_fill_metadata_dst(struct net_device *dev,
 462                                      struct sk_buff *skb)
 463 {
 464         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 465         struct bareudp_dev *bareudp = netdev_priv(dev);
 466         bool use_cache;
 467
 468         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 469
 470         if (ip_tunnel_info_af(info) == AF_INET) {
 471                 struct rtable *rt;
 472                 __be32 saddr;
 473
 474                 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
 475                                             info, IPPROTO_UDP, use_cache);
 476                 if (IS_ERR(rt))
 477                         return PTR_ERR(rt);
 478
 479                 ip_rt_put(rt);
 480                 info->key.u.ipv4.src = saddr;
 481 #if IS_ENABLED(CONFIG_IPV6)
 482         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 483                 struct dst_entry *dst;
 484                 struct in6_addr saddr;
 485                 struct socket *sock = rcu_dereference(bareudp->sock);
 486
 487                 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
 488                                             &saddr, info, IPPROTO_UDP,
 489                                             use_cache);
 490                 if (IS_ERR(dst))
 491                         return PTR_ERR(dst);
 492
 493                 dst_release(dst);
 494                 info->key.u.ipv6.src = saddr;
 495 #endif
 496         } else {
 497                 return -EINVAL;
 498         }
 499
 500         info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
 501                                              bareudp->sport_min,
 502                         USHRT_MAX, true);
 503         info->key.tp_dst = bareudp->port;
 504         return 0;
 505 }
 506
 507 static const struct net_device_ops bareudp_netdev_ops = {
 508         .ndo_init               = bareudp_init,
 509         .ndo_uninit             = bareudp_uninit,
 510         .ndo_open               = bareudp_open,
 511         .ndo_stop               = bareudp_stop,
 512         .ndo_start_xmit         = bareudp_xmit,
 513         .ndo_get_stats64        = ip_tunnel_get_stats64,
 514         .ndo_fill_metadata_dst  = bareudp_fill_metadata_dst,
 515 };
 516
 517 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
 518         [IFLA_BAREUDP_PORT]                = { .type = NLA_U16 },
 519         [IFLA_BAREUDP_ETHERTYPE]           = { .type = NLA_U16 },
 520         [IFLA_BAREUDP_SRCPORT_MIN]         = { .type = NLA_U16 },
 521         [IFLA_BAREUDP_MULTIPROTO_MODE]     = { .type = NLA_FLAG },
 522 };
 523
 524 /* Info for udev, that this is a virtual tunnel endpoint */
 525 static struct device_type bareudp_type = {
 526         .name = "bareudp",
 527 };
 528
 529 /* Initialize the device structure. */
 530 static void bareudp_setup(struct net_device *dev)
 531 {
 532         dev->netdev_ops = &bareudp_netdev_ops;
 533         dev->needs_free_netdev = true;
 534         SET_NETDEV_DEVTYPE(dev, &bareudp_type);
 535         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
 536         dev->features    |= NETIF_F_RXCSUM;
 537         dev->features    |= NETIF_F_GSO_SOFTWARE;
 538         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
 539         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
 540         dev->hard_header_len = 0;
 541         dev->addr_len = 0;
 542         dev->mtu = ETH_DATA_LEN;
 543         dev->min_mtu = IPV4_MIN_MTU;
 544         dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
 545         dev->type = ARPHRD_NONE;
 546         netif_keep_dst(dev);
 547         dev->priv_flags |= IFF_NO_QUEUE;
 548         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 549 }
 550
 551 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
 552                             struct netlink_ext_ack *extack)
 553 {
 554         if (!data) {
 555                 NL_SET_ERR_MSG(extack,
 556                                "Not enough attributes provided to perform the operation");
 557                 return -EINVAL;
 558         }
 559         return 0;
 560 }
 561
 562 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
 563                         struct netlink_ext_ack *extack)
 564 {
 565         if (!data[IFLA_BAREUDP_PORT]) {
 566                 NL_SET_ERR_MSG(extack, "port not specified");
 567                 return -EINVAL;
 568         }
 569         if (!data[IFLA_BAREUDP_ETHERTYPE]) {
 570                 NL_SET_ERR_MSG(extack, "ethertype not specified");
 571                 return -EINVAL;
 572         }
 573
 574         if (data[IFLA_BAREUDP_PORT])
 575                 conf->port =  nla_get_u16(data[IFLA_BAREUDP_PORT]);
 576
 577         if (data[IFLA_BAREUDP_ETHERTYPE])
 578                 conf->ethertype =  nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
 579
 580         if (data[IFLA_BAREUDP_SRCPORT_MIN])
 581                 conf->sport_min =  nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
 582
 583         return 0;
 584 }
 585
 586 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
 587                                             const struct bareudp_conf *conf)
 588 {
 589         struct bareudp_dev *bareudp, *t = NULL;
 590
 591         list_for_each_entry(bareudp, &bn->bareudp_list, next) {
 592                 if (conf->port == bareudp->port)
 593                         t = bareudp;
 594         }
 595         return t;
 596 }
 597
 598 static int bareudp_configure(struct net *net, struct net_device *dev,
 599                              struct bareudp_conf *conf)
 600 {
 601         struct bareudp_net *bn = net_generic(net, bareudp_net_id);
 602         struct bareudp_dev *t, *bareudp = netdev_priv(dev);
 603         int err;
 604
 605         bareudp->net = net;
 606         bareudp->dev = dev;
 607         t = bareudp_find_dev(bn, conf);
 608         if (t)
 609                 return -EBUSY;
 610
 611         if (conf->multi_proto_mode &&
 612             (conf->ethertype != htons(ETH_P_MPLS_UC) &&
 613              conf->ethertype != htons(ETH_P_IP)))
 614                 return -EINVAL;
 615
 616         bareudp->port = conf->port;
 617         bareudp->ethertype = conf->ethertype;
 618         bareudp->sport_min = conf->sport_min;
 619         bareudp->multi_proto_mode = conf->multi_proto_mode;
 620         err = register_netdevice(dev);
 621         if (err)
 622                 return err;
 623
 624         list_add(&bareudp->next, &bn->bareudp_list);
 625         return 0;
 626 }
 627
 628 static int bareudp_link_config(struct net_device *dev,
 629                                struct nlattr *tb[])
 630 {
 631         int err;
 632
 633         if (tb[IFLA_MTU]) {
 634                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 635                 if (err)
 636                         return err;
 637         }
 638         return 0;
 639 }
 640
 641 static int bareudp_newlink(struct net *net, struct net_device *dev,
 642                            struct nlattr *tb[], struct nlattr *data[],
 643                            struct netlink_ext_ack *extack)
 644 {
 645         struct bareudp_conf conf;
 646         int err;
 647
 648         err = bareudp2info(data, &conf, extack);
 649         if (err)
 650                 return err;
 651
 652         err = bareudp_configure(net, dev, &conf);
 653         if (err)
 654                 return err;
 655
 656         err = bareudp_link_config(dev, tb);
 657         if (err)
 658                 return err;
 659
 660         return 0;
 661 }
 662
 663 static void bareudp_dellink(struct net_device *dev, struct list_head *head)
 664 {
 665         struct bareudp_dev *bareudp = netdev_priv(dev);
 666
 667         list_del(&bareudp->next);
 668         unregister_netdevice_queue(dev, head);
 669 }
 670
 671 static size_t bareudp_get_size(const struct net_device *dev)
 672 {
 673         return  nla_total_size(sizeof(__be16)) +  /* IFLA_BAREUDP_PORT */
 674                 nla_total_size(sizeof(__be16)) +  /* IFLA_BAREUDP_ETHERTYPE */
 675                 nla_total_size(sizeof(__u16))  +  /* IFLA_BAREUDP_SRCPORT_MIN */
 676                 nla_total_size(0)              +  /* IFLA_BAREUDP_MULTIPROTO_MODE */
 677                 0;
 678 }
 679
 680 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
 681 {
 682         struct bareudp_dev *bareudp = netdev_priv(dev);
 683
 684         if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
 685                 goto nla_put_failure;
 686         if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
 687                 goto nla_put_failure;
 688         if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
 689                 goto nla_put_failure;
 690         if (bareudp->multi_proto_mode &&
 691             nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
 692                 goto nla_put_failure;
 693
 694         return 0;
 695
 696 nla_put_failure:
 697         return -EMSGSIZE;
 698 }
 699
 700 static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
 701         .kind           = "bareudp",
 702         .maxtype        = IFLA_BAREUDP_MAX,
 703         .policy         = bareudp_policy,
 704         .priv_size      = sizeof(struct bareudp_dev),
 705         .setup          = bareudp_setup,
 706         .validate       = bareudp_validate,
 707         .newlink        = bareudp_newlink,
 708         .dellink        = bareudp_dellink,
 709         .get_size       = bareudp_get_size,
 710         .fill_info      = bareudp_fill_info,
 711 };
 712
 713 struct net_device *bareudp_dev_create(struct net *net, const char *name,
 714                                       u8 name_assign_type,
 715                                       struct bareudp_conf *conf)
 716 {
 717         struct nlattr *tb[IFLA_MAX + 1];
 718         struct net_device *dev;
 719         LIST_HEAD(list_kill);
 720         int err;
 721
 722         memset(tb, 0, sizeof(tb));
 723         dev = rtnl_create_link(net, name, name_assign_type,
 724                                &bareudp_link_ops, tb, NULL);
 725         if (IS_ERR(dev))
 726                 return dev;
 727
 728         err = bareudp_configure(net, dev, conf);
 729         if (err) {
 730                 free_netdev(dev);
 731                 return ERR_PTR(err);
 732         }
 733         err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
 734         if (err)
 735                 goto err;
 736
 737         err = rtnl_configure_link(dev, NULL);
 738         if (err < 0)
 739                 goto err;
 740
 741         return dev;
 742 err:
 743         bareudp_dellink(dev, &list_kill);
 744         unregister_netdevice_many(&list_kill);
 745         return ERR_PTR(err);
 746 }
 747 EXPORT_SYMBOL_GPL(bareudp_dev_create);
 748
 749 static __net_init int bareudp_init_net(struct net *net)
 750 {
 751         struct bareudp_net *bn = net_generic(net, bareudp_net_id);
 752
 753         INIT_LIST_HEAD(&bn->bareudp_list);
 754         return 0;
 755 }
 756
 757 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
 758 {
 759         struct bareudp_net *bn = net_generic(net, bareudp_net_id);
 760         struct bareudp_dev *bareudp, *next;
 761
 762         list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
 763                 unregister_netdevice_queue(bareudp->dev, head);
 764 }
 765
 766 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
 767 {
 768         struct net *net;
 769         LIST_HEAD(list);
 770
 771         rtnl_lock();
 772         list_for_each_entry(net, net_list, exit_list)
 773                 bareudp_destroy_tunnels(net, &list);
 774
 775         /* unregister the devices gathered above */
 776         unregister_netdevice_many(&list);
 777         rtnl_unlock();
 778 }
 779
 780 static struct pernet_operations bareudp_net_ops = {
 781         .init = bareudp_init_net,
 782         .exit_batch = bareudp_exit_batch_net,
 783         .id   = &bareudp_net_id,
 784         .size = sizeof(struct bareudp_net),
 785 };
 786
 787 static int __init bareudp_init_module(void)
 788 {
 789         int rc;
 790
 791         rc = register_pernet_subsys(&bareudp_net_ops);
 792         if (rc)
 793                 goto out1;
 794
 795         rc = rtnl_link_register(&bareudp_link_ops);
 796         if (rc)
 797                 goto out2;
 798
 799         return 0;
 800 out2:
 801         unregister_pernet_subsys(&bareudp_net_ops);
 802 out1:
 803         return rc;
 804 }
 805 late_initcall(bareudp_init_module);
 806
 807 static void __exit bareudp_cleanup_module(void)
 808 {
 809         rtnl_link_unregister(&bareudp_link_ops);
 810         unregister_pernet_subsys(&bareudp_net_ops);
 811 }
 812 module_exit(bareudp_cleanup_module);
 813
 814 MODULE_ALIAS_RTNL_LINK("bareudp");
 815 MODULE_LICENSE("GPL");
 816 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
 817 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");