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         if (sock->sk->sk_family == AF_INET6)
 254                 udp_encap_enable();
 255
 256         rcu_assign_pointer(bareudp->sock, sock);
 257         return 0;
 258 }
 259
 260 static int bareudp_open(struct net_device *dev)
 261 {
 262         struct bareudp_dev *bareudp = netdev_priv(dev);
 263         int ret = 0;
 264
 265         ret =  bareudp_socket_create(bareudp, bareudp->port);
 266         return ret;
 267 }
 268
 269 static void bareudp_sock_release(struct bareudp_dev *bareudp)
 270 {
 271         struct socket *sock;
 272
 273         sock = bareudp->sock;
 274         rcu_assign_pointer(bareudp->sock, NULL);
 275         synchronize_net();
 276         udp_tunnel_sock_release(sock);
 277 }
 278
 279 static int bareudp_stop(struct net_device *dev)
 280 {
 281         struct bareudp_dev *bareudp = netdev_priv(dev);
 282
 283         bareudp_sock_release(bareudp);
 284         return 0;
 285 }
 286
 287 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 288                             struct bareudp_dev *bareudp,
 289                             const struct ip_tunnel_info *info)
 290 {
 291         bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
 292         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 293         struct socket *sock = rcu_dereference(bareudp->sock);
 294         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 295         const struct ip_tunnel_key *key = &info->key;
 296         struct rtable *rt;
 297         __be16 sport, df;
 298         int min_headroom;
 299         __u8 tos, ttl;
 300         __be32 saddr;
 301         int err;
 302
 303         if (!sock)
 304                 return -ESHUTDOWN;
 305
 306         rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
 307                                     IPPROTO_UDP, use_cache);
 308
 309         if (IS_ERR(rt))
 310                 return PTR_ERR(rt);
 311
 312         skb_tunnel_check_pmtu(skb, &rt->dst,
 313                               BAREUDP_IPV4_HLEN + info->options_len);
 314
 315         sport = udp_flow_src_port(bareudp->net, skb,
 316                                   bareudp->sport_min, USHRT_MAX,
 317                                   true);
 318         tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 319         ttl = key->ttl;
 320         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 321         skb_scrub_packet(skb, xnet);
 322
 323         if (!skb_pull(skb, skb_network_offset(skb)))
 324                 goto free_dst;
 325
 326         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
 327                 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
 328
 329         err = skb_cow_head(skb, min_headroom);
 330         if (unlikely(err))
 331                 goto free_dst;
 332
 333         err = udp_tunnel_handle_offloads(skb, udp_sum);
 334         if (err)
 335                 goto free_dst;
 336
 337         skb_set_inner_protocol(skb, bareudp->ethertype);
 338         udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
 339                             tos, ttl, df, sport, bareudp->port,
 340                             !net_eq(bareudp->net, dev_net(bareudp->dev)),
 341                             !(info->key.tun_flags & TUNNEL_CSUM));
 342         return 0;
 343
 344 free_dst:
 345         dst_release(&rt->dst);
 346         return err;
 347 }
 348
 349 #if IS_ENABLED(CONFIG_IPV6)
 350 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 351                              struct bareudp_dev *bareudp,
 352                              const struct ip_tunnel_info *info)
 353 {
 354         bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
 355         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 356         struct socket *sock  = rcu_dereference(bareudp->sock);
 357         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 358         const struct ip_tunnel_key *key = &info->key;
 359         struct dst_entry *dst = NULL;
 360         struct in6_addr saddr, daddr;
 361         int min_headroom;
 362         __u8 prio, ttl;
 363         __be16 sport;
 364         int err;
 365
 366         if (!sock)
 367                 return -ESHUTDOWN;
 368
 369         dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
 370                                     IPPROTO_UDP, use_cache);
 371         if (IS_ERR(dst))
 372                 return PTR_ERR(dst);
 373
 374         skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len);
 375
 376         sport = udp_flow_src_port(bareudp->net, skb,
 377                                   bareudp->sport_min, USHRT_MAX,
 378                                   true);
 379         prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 380         ttl = key->ttl;
 381
 382         skb_scrub_packet(skb, xnet);
 383
 384         if (!skb_pull(skb, skb_network_offset(skb)))
 385                 goto free_dst;
 386
 387         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 388                 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
 389
 390         err = skb_cow_head(skb, min_headroom);
 391         if (unlikely(err))
 392                 goto free_dst;
 393
 394         err = udp_tunnel_handle_offloads(skb, udp_sum);
 395         if (err)
 396                 goto free_dst;
 397
 398         daddr = info->key.u.ipv6.dst;
 399         udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
 400                              &saddr, &daddr, prio, ttl,
 401                              info->key.label, sport, bareudp->port,
 402                              !(info->key.tun_flags & TUNNEL_CSUM));
 403         return 0;
 404
 405 free_dst:
 406         dst_release(dst);
 407         return err;
 408 }
 409 #endif
 410
 411 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
 412 {
 413         struct bareudp_dev *bareudp = netdev_priv(dev);
 414         struct ip_tunnel_info *info = NULL;
 415         int err;
 416
 417         if (skb->protocol != bareudp->ethertype) {
 418                 if (!bareudp->multi_proto_mode ||
 419                     (skb->protocol !=  htons(ETH_P_MPLS_MC) &&
 420                      skb->protocol !=  htons(ETH_P_IPV6))) {
 421                         err = -EINVAL;
 422                         goto tx_error;
 423                 }
 424         }
 425
 426         info = skb_tunnel_info(skb);
 427         if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 428                 err = -EINVAL;
 429                 goto tx_error;
 430         }
 431
 432         rcu_read_lock();
 433 #if IS_ENABLED(CONFIG_IPV6)
 434         if (info->mode & IP_TUNNEL_INFO_IPV6)
 435                 err = bareudp6_xmit_skb(skb, dev, bareudp, info);
 436         else
 437 #endif
 438                 err = bareudp_xmit_skb(skb, dev, bareudp, info);
 439
 440         rcu_read_unlock();
 441
 442         if (likely(!err))
 443                 return NETDEV_TX_OK;
 444 tx_error:
 445         dev_kfree_skb(skb);
 446
 447         if (err == -ELOOP)
 448                 dev->stats.collisions++;
 449         else if (err == -ENETUNREACH)
 450                 dev->stats.tx_carrier_errors++;
 451
 452         dev->stats.tx_errors++;
 453         return NETDEV_TX_OK;
 454 }
 455
 456 static int bareudp_fill_metadata_dst(struct net_device *dev,
 457                                      struct sk_buff *skb)
 458 {
 459         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 460         struct bareudp_dev *bareudp = netdev_priv(dev);
 461         bool use_cache;
 462
 463         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 464
 465         if (ip_tunnel_info_af(info) == AF_INET) {
 466                 struct rtable *rt;
 467                 __be32 saddr;
 468
 469                 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
 470                                             info, IPPROTO_UDP, use_cache);
 471                 if (IS_ERR(rt))
 472                         return PTR_ERR(rt);
 473
 474                 ip_rt_put(rt);
 475                 info->key.u.ipv4.src = saddr;
 476 #if IS_ENABLED(CONFIG_IPV6)
 477         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 478                 struct dst_entry *dst;
 479                 struct in6_addr saddr;
 480                 struct socket *sock = rcu_dereference(bareudp->sock);
 481
 482                 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
 483                                             &saddr, info, IPPROTO_UDP,
 484                                             use_cache);
 485                 if (IS_ERR(dst))
 486                         return PTR_ERR(dst);
 487
 488                 dst_release(dst);
 489                 info->key.u.ipv6.src = saddr;
 490 #endif
 491         } else {
 492                 return -EINVAL;
 493         }
 494
 495         info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
 496                                              bareudp->sport_min,
 497                         USHRT_MAX, true);
 498         info->key.tp_dst = bareudp->port;
 499         return 0;
 500 }
 501
 502 static const struct net_device_ops bareudp_netdev_ops = {
 503         .ndo_init               = bareudp_init,
 504         .ndo_uninit             = bareudp_uninit,
 505         .ndo_open               = bareudp_open,
 506         .ndo_stop               = bareudp_stop,
 507         .ndo_start_xmit         = bareudp_xmit,
 508         .ndo_get_stats64        = ip_tunnel_get_stats64,
 509         .ndo_fill_metadata_dst  = bareudp_fill_metadata_dst,
 510 };
 511
 512 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
 513         [IFLA_BAREUDP_PORT]                = { .type = NLA_U16 },
 514         [IFLA_BAREUDP_ETHERTYPE]           = { .type = NLA_U16 },
 515         [IFLA_BAREUDP_SRCPORT_MIN]         = { .type = NLA_U16 },
 516         [IFLA_BAREUDP_MULTIPROTO_MODE]     = { .type = NLA_FLAG },
 517 };
 518
 519 /* Info for udev, that this is a virtual tunnel endpoint */
 520 static struct device_type bareudp_type = {
 521         .name = "bareudp",
 522 };
 523
 524 /* Initialize the device structure. */
 525 static void bareudp_setup(struct net_device *dev)
 526 {
 527         dev->netdev_ops = &bareudp_netdev_ops;
 528         dev->needs_free_netdev = true;
 529         SET_NETDEV_DEVTYPE(dev, &bareudp_type);
 530         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
 531         dev->features    |= NETIF_F_RXCSUM;
 532         dev->features    |= NETIF_F_GSO_SOFTWARE;
 533         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
 534         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
 535         dev->hard_header_len = 0;
 536         dev->addr_len = 0;
 537         dev->mtu = ETH_DATA_LEN;
 538         dev->min_mtu = IPV4_MIN_MTU;
 539         dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
 540         dev->type = ARPHRD_NONE;
 541         netif_keep_dst(dev);
 542         dev->priv_flags |= IFF_NO_QUEUE;
 543         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 544 }
 545
 546 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
 547                             struct netlink_ext_ack *extack)
 548 {
 549         if (!data) {
 550                 NL_SET_ERR_MSG(extack,
 551                                "Not enough attributes provided to perform the operation");
 552                 return -EINVAL;
 553         }
 554         return 0;
 555 }
 556
 557 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf)
 558 {
 559         if (!data[IFLA_BAREUDP_PORT] || !data[IFLA_BAREUDP_ETHERTYPE])
 560                 return -EINVAL;
 561
 562         if (data[IFLA_BAREUDP_PORT])
 563                 conf->port =  nla_get_u16(data[IFLA_BAREUDP_PORT]);
 564
 565         if (data[IFLA_BAREUDP_ETHERTYPE])
 566                 conf->ethertype =  nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
 567
 568         if (data[IFLA_BAREUDP_SRCPORT_MIN])
 569                 conf->sport_min =  nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
 570
 571         return 0;
 572 }
 573
 574 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
 575                                             const struct bareudp_conf *conf)
 576 {
 577         struct bareudp_dev *bareudp, *t = NULL;
 578
 579         list_for_each_entry(bareudp, &bn->bareudp_list, next) {
 580                 if (conf->port == bareudp->port)
 581                         t = bareudp;
 582         }
 583         return t;
 584 }
 585
 586 static int bareudp_configure(struct net *net, struct net_device *dev,
 587                              struct bareudp_conf *conf)
 588 {
 589         struct bareudp_net *bn = net_generic(net, bareudp_net_id);
 590         struct bareudp_dev *t, *bareudp = netdev_priv(dev);
 591         int err;
 592
 593         bareudp->net = net;
 594         bareudp->dev = dev;
 595         t = bareudp_find_dev(bn, conf);
 596         if (t)
 597                 return -EBUSY;
 598
 599         if (conf->multi_proto_mode &&
 600             (conf->ethertype != htons(ETH_P_MPLS_UC) &&
 601              conf->ethertype != htons(ETH_P_IP)))
 602                 return -EINVAL;
 603
 604         bareudp->port = conf->port;
 605         bareudp->ethertype = conf->ethertype;
 606         bareudp->sport_min = conf->sport_min;
 607         bareudp->multi_proto_mode = conf->multi_proto_mode;
 608         err = register_netdevice(dev);
 609         if (err)
 610                 return err;
 611
 612         list_add(&bareudp->next, &bn->bareudp_list);
 613         return 0;
 614 }
 615
 616 static int bareudp_link_config(struct net_device *dev,
 617                                struct nlattr *tb[])
 618 {
 619         int err;
 620
 621         if (tb[IFLA_MTU]) {
 622                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 623                 if (err)
 624                         return err;
 625         }
 626         return 0;
 627 }
 628
 629 static int bareudp_newlink(struct net *net, struct net_device *dev,
 630                            struct nlattr *tb[], struct nlattr *data[],
 631                            struct netlink_ext_ack *extack)
 632 {
 633         struct bareudp_conf conf;
 634         int err;
 635
 636         err = bareudp2info(data, &conf);
 637         if (err)
 638                 return err;
 639
 640         err = bareudp_configure(net, dev, &conf);
 641         if (err)
 642                 return err;
 643
 644         err = bareudp_link_config(dev, tb);
 645         if (err)
 646                 return err;
 647
 648         return 0;
 649 }
 650
 651 static void bareudp_dellink(struct net_device *dev, struct list_head *head)
 652 {
 653         struct bareudp_dev *bareudp = netdev_priv(dev);
 654
 655         list_del(&bareudp->next);
 656         unregister_netdevice_queue(dev, head);
 657 }
 658
 659 static size_t bareudp_get_size(const struct net_device *dev)
 660 {
 661         return  nla_total_size(sizeof(__be16)) +  /* IFLA_BAREUDP_PORT */
 662                 nla_total_size(sizeof(__be16)) +  /* IFLA_BAREUDP_ETHERTYPE */
 663                 nla_total_size(sizeof(__u16))  +  /* IFLA_BAREUDP_SRCPORT_MIN */
 664                 nla_total_size(0)              +  /* IFLA_BAREUDP_MULTIPROTO_MODE */
 665                 0;
 666 }
 667
 668 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
 669 {
 670         struct bareudp_dev *bareudp = netdev_priv(dev);
 671
 672         if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
 673                 goto nla_put_failure;
 674         if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
 675                 goto nla_put_failure;
 676         if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
 677                 goto nla_put_failure;
 678         if (bareudp->multi_proto_mode &&
 679             nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
 680                 goto nla_put_failure;
 681
 682         return 0;
 683
 684 nla_put_failure:
 685         return -EMSGSIZE;
 686 }
 687
 688 static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
 689         .kind           = "bareudp",
 690         .maxtype        = IFLA_BAREUDP_MAX,
 691         .policy         = bareudp_policy,
 692         .priv_size      = sizeof(struct bareudp_dev),
 693         .setup          = bareudp_setup,
 694         .validate       = bareudp_validate,
 695         .newlink        = bareudp_newlink,
 696         .dellink        = bareudp_dellink,
 697         .get_size       = bareudp_get_size,
 698         .fill_info      = bareudp_fill_info,
 699 };
 700
 701 struct net_device *bareudp_dev_create(struct net *net, const char *name,
 702                                       u8 name_assign_type,
 703                                       struct bareudp_conf *conf)
 704 {
 705         struct nlattr *tb[IFLA_MAX + 1];
 706         struct net_device *dev;
 707         LIST_HEAD(list_kill);
 708         int err;
 709
 710         memset(tb, 0, sizeof(tb));
 711         dev = rtnl_create_link(net, name, name_assign_type,
 712                                &bareudp_link_ops, tb, NULL);
 713         if (IS_ERR(dev))
 714                 return dev;
 715
 716         err = bareudp_configure(net, dev, conf);
 717         if (err) {
 718                 free_netdev(dev);
 719                 return ERR_PTR(err);
 720         }
 721         err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
 722         if (err)
 723                 goto err;
 724
 725         err = rtnl_configure_link(dev, NULL);
 726         if (err < 0)
 727                 goto err;
 728
 729         return dev;
 730 err:
 731         bareudp_dellink(dev, &list_kill);
 732         unregister_netdevice_many(&list_kill);
 733         return ERR_PTR(err);
 734 }
 735 EXPORT_SYMBOL_GPL(bareudp_dev_create);
 736
 737 static __net_init int bareudp_init_net(struct net *net)
 738 {
 739         struct bareudp_net *bn = net_generic(net, bareudp_net_id);
 740
 741         INIT_LIST_HEAD(&bn->bareudp_list);
 742         return 0;
 743 }
 744
 745 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
 746 {
 747         struct bareudp_net *bn = net_generic(net, bareudp_net_id);
 748         struct bareudp_dev *bareudp, *next;
 749
 750         list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
 751                 unregister_netdevice_queue(bareudp->dev, head);
 752 }
 753
 754 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
 755 {
 756         struct net *net;
 757         LIST_HEAD(list);
 758
 759         rtnl_lock();
 760         list_for_each_entry(net, net_list, exit_list)
 761                 bareudp_destroy_tunnels(net, &list);
 762
 763         /* unregister the devices gathered above */
 764         unregister_netdevice_many(&list);
 765         rtnl_unlock();
 766 }
 767
 768 static struct pernet_operations bareudp_net_ops = {
 769         .init = bareudp_init_net,
 770         .exit_batch = bareudp_exit_batch_net,
 771         .id   = &bareudp_net_id,
 772         .size = sizeof(struct bareudp_net),
 773 };
 774
 775 static int __init bareudp_init_module(void)
 776 {
 777         int rc;
 778
 779         rc = register_pernet_subsys(&bareudp_net_ops);
 780         if (rc)
 781                 goto out1;
 782
 783         rc = rtnl_link_register(&bareudp_link_ops);
 784         if (rc)
 785                 goto out2;
 786
 787         return 0;
 788 out2:
 789         unregister_pernet_subsys(&bareudp_net_ops);
 790 out1:
 791         return rc;
 792 }
 793 late_initcall(bareudp_init_module);
 794
 795 static void __exit bareudp_cleanup_module(void)
 796 {
 797         rtnl_link_unregister(&bareudp_link_ops);
 798         unregister_pernet_subsys(&bareudp_net_ops);
 799 }
 800 module_exit(bareudp_cleanup_module);
 801
 802 MODULE_LICENSE("GPL");
 803 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
 804 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");