1571912c6SMartin Varghese // SPDX-License-Identifier: GPL-2.0 2571912c6SMartin Varghese /* Bareudp: UDP tunnel encasulation for different Payload types like 3571912c6SMartin Varghese * MPLS, NSH, IP, etc. 4571912c6SMartin Varghese * Copyright (c) 2019 Nokia, Inc. 5571912c6SMartin Varghese * Authors: Martin Varghese, <martin.varghese@nokia.com> 6571912c6SMartin Varghese */ 7571912c6SMartin Varghese 8571912c6SMartin Varghese #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9571912c6SMartin Varghese 10571912c6SMartin Varghese #include <linux/kernel.h> 11571912c6SMartin Varghese #include <linux/module.h> 12571912c6SMartin Varghese #include <linux/etherdevice.h> 13571912c6SMartin Varghese #include <linux/hash.h> 14571912c6SMartin Varghese #include <net/dst_metadata.h> 15571912c6SMartin Varghese #include <net/gro_cells.h> 16571912c6SMartin Varghese #include <net/rtnetlink.h> 17571912c6SMartin Varghese #include <net/protocol.h> 18571912c6SMartin Varghese #include <net/ip6_tunnel.h> 19571912c6SMartin Varghese #include <net/ip_tunnels.h> 20571912c6SMartin Varghese #include <net/udp_tunnel.h> 21571912c6SMartin Varghese #include <net/bareudp.h> 22571912c6SMartin Varghese 23571912c6SMartin Varghese #define BAREUDP_BASE_HLEN sizeof(struct udphdr) 24571912c6SMartin Varghese #define BAREUDP_IPV4_HLEN (sizeof(struct iphdr) + \ 25571912c6SMartin Varghese sizeof(struct udphdr)) 26571912c6SMartin Varghese #define BAREUDP_IPV6_HLEN (sizeof(struct ipv6hdr) + \ 27571912c6SMartin Varghese sizeof(struct udphdr)) 28571912c6SMartin Varghese 29571912c6SMartin Varghese static bool log_ecn_error = true; 30571912c6SMartin Varghese module_param(log_ecn_error, bool, 0644); 31571912c6SMartin Varghese MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 32571912c6SMartin Varghese 33571912c6SMartin Varghese /* per-network namespace private data for this module */ 34571912c6SMartin Varghese 35571912c6SMartin Varghese static unsigned int bareudp_net_id; 36571912c6SMartin Varghese 37571912c6SMartin Varghese struct bareudp_net { 38571912c6SMartin Varghese struct list_head bareudp_list; 39571912c6SMartin Varghese }; 40571912c6SMartin Varghese 41571912c6SMartin Varghese /* Pseudo network device */ 42571912c6SMartin Varghese struct bareudp_dev { 43571912c6SMartin Varghese struct net *net; /* netns for packet i/o */ 44571912c6SMartin Varghese struct net_device *dev; /* netdev for bareudp tunnel */ 45571912c6SMartin Varghese __be16 ethertype; 46571912c6SMartin Varghese __be16 port; 47571912c6SMartin Varghese u16 sport_min; 484b5f6723SMartin Varghese bool multi_proto_mode; 49571912c6SMartin Varghese struct socket __rcu *sock; 50571912c6SMartin Varghese struct list_head next; /* bareudp node on namespace list */ 51571912c6SMartin Varghese struct gro_cells gro_cells; 52571912c6SMartin Varghese }; 53571912c6SMartin Varghese 54571912c6SMartin Varghese static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 55571912c6SMartin Varghese { 56571912c6SMartin Varghese struct metadata_dst *tun_dst = NULL; 57571912c6SMartin Varghese struct pcpu_sw_netstats *stats; 58571912c6SMartin Varghese struct bareudp_dev *bareudp; 59571912c6SMartin Varghese unsigned short family; 60571912c6SMartin Varghese unsigned int len; 61571912c6SMartin Varghese __be16 proto; 62571912c6SMartin Varghese void *oiph; 63571912c6SMartin Varghese int err; 64571912c6SMartin Varghese 65571912c6SMartin Varghese bareudp = rcu_dereference_sk_user_data(sk); 66571912c6SMartin Varghese if (!bareudp) 67571912c6SMartin Varghese goto drop; 68571912c6SMartin Varghese 69571912c6SMartin Varghese if (skb->protocol == htons(ETH_P_IP)) 70571912c6SMartin Varghese family = AF_INET; 71571912c6SMartin Varghese else 72571912c6SMartin Varghese family = AF_INET6; 73571912c6SMartin Varghese 744b5f6723SMartin Varghese if (bareudp->ethertype == htons(ETH_P_IP)) { 754b5f6723SMartin Varghese struct iphdr *iphdr; 764b5f6723SMartin Varghese 774b5f6723SMartin Varghese iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN); 784b5f6723SMartin Varghese if (iphdr->version == 4) { 79571912c6SMartin Varghese proto = bareudp->ethertype; 804b5f6723SMartin Varghese } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) { 814b5f6723SMartin Varghese proto = htons(ETH_P_IPV6); 824b5f6723SMartin Varghese } else { 834b5f6723SMartin Varghese bareudp->dev->stats.rx_dropped++; 844b5f6723SMartin Varghese goto drop; 854b5f6723SMartin Varghese } 864b5f6723SMartin Varghese } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { 874b5f6723SMartin Varghese struct iphdr *tunnel_hdr; 884b5f6723SMartin Varghese 894b5f6723SMartin Varghese tunnel_hdr = (struct iphdr *)skb_network_header(skb); 904b5f6723SMartin Varghese if (tunnel_hdr->version == 4) { 914b5f6723SMartin Varghese if (!ipv4_is_multicast(tunnel_hdr->daddr)) { 924b5f6723SMartin Varghese proto = bareudp->ethertype; 934b5f6723SMartin Varghese } else if (bareudp->multi_proto_mode && 944b5f6723SMartin Varghese ipv4_is_multicast(tunnel_hdr->daddr)) { 954b5f6723SMartin Varghese proto = htons(ETH_P_MPLS_MC); 964b5f6723SMartin Varghese } else { 974b5f6723SMartin Varghese bareudp->dev->stats.rx_dropped++; 984b5f6723SMartin Varghese goto drop; 994b5f6723SMartin Varghese } 1004b5f6723SMartin Varghese } else { 1014b5f6723SMartin Varghese int addr_type; 1024b5f6723SMartin Varghese struct ipv6hdr *tunnel_hdr_v6; 1034b5f6723SMartin Varghese 1044b5f6723SMartin Varghese tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); 1054b5f6723SMartin Varghese addr_type = 1064b5f6723SMartin Varghese ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); 1074b5f6723SMartin Varghese if (!(addr_type & IPV6_ADDR_MULTICAST)) { 1084b5f6723SMartin Varghese proto = bareudp->ethertype; 1094b5f6723SMartin Varghese } else if (bareudp->multi_proto_mode && 1104b5f6723SMartin Varghese (addr_type & IPV6_ADDR_MULTICAST)) { 1114b5f6723SMartin Varghese proto = htons(ETH_P_MPLS_MC); 1124b5f6723SMartin Varghese } else { 1134b5f6723SMartin Varghese bareudp->dev->stats.rx_dropped++; 1144b5f6723SMartin Varghese goto drop; 1154b5f6723SMartin Varghese } 1164b5f6723SMartin Varghese } 1174b5f6723SMartin Varghese } else { 1184b5f6723SMartin Varghese proto = bareudp->ethertype; 1194b5f6723SMartin Varghese } 120571912c6SMartin Varghese 121571912c6SMartin Varghese if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, 122571912c6SMartin Varghese proto, 123571912c6SMartin Varghese !net_eq(bareudp->net, 124571912c6SMartin Varghese dev_net(bareudp->dev)))) { 125571912c6SMartin Varghese bareudp->dev->stats.rx_dropped++; 126571912c6SMartin Varghese goto drop; 127571912c6SMartin Varghese } 128571912c6SMartin Varghese 129571912c6SMartin Varghese tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0); 130571912c6SMartin Varghese if (!tun_dst) { 131571912c6SMartin Varghese bareudp->dev->stats.rx_dropped++; 132571912c6SMartin Varghese goto drop; 133571912c6SMartin Varghese } 134571912c6SMartin Varghese skb_dst_set(skb, &tun_dst->dst); 135571912c6SMartin Varghese skb->dev = bareudp->dev; 136571912c6SMartin Varghese oiph = skb_network_header(skb); 137571912c6SMartin Varghese skb_reset_network_header(skb); 138571912c6SMartin Varghese 139571912c6SMartin Varghese if (family == AF_INET) 140571912c6SMartin Varghese err = IP_ECN_decapsulate(oiph, skb); 141571912c6SMartin Varghese #if IS_ENABLED(CONFIG_IPV6) 142571912c6SMartin Varghese else 143571912c6SMartin Varghese err = IP6_ECN_decapsulate(oiph, skb); 144571912c6SMartin Varghese #endif 145571912c6SMartin Varghese 146571912c6SMartin Varghese if (unlikely(err)) { 147571912c6SMartin Varghese if (log_ecn_error) { 148571912c6SMartin Varghese if (family == AF_INET) 149571912c6SMartin Varghese net_info_ratelimited("non-ECT from %pI4 " 150571912c6SMartin Varghese "with TOS=%#x\n", 151571912c6SMartin Varghese &((struct iphdr *)oiph)->saddr, 152571912c6SMartin Varghese ((struct iphdr *)oiph)->tos); 153571912c6SMartin Varghese #if IS_ENABLED(CONFIG_IPV6) 154571912c6SMartin Varghese else 155571912c6SMartin Varghese net_info_ratelimited("non-ECT from %pI6\n", 156571912c6SMartin Varghese &((struct ipv6hdr *)oiph)->saddr); 157571912c6SMartin Varghese #endif 158571912c6SMartin Varghese } 159571912c6SMartin Varghese if (err > 1) { 160571912c6SMartin Varghese ++bareudp->dev->stats.rx_frame_errors; 161571912c6SMartin Varghese ++bareudp->dev->stats.rx_errors; 162571912c6SMartin Varghese goto drop; 163571912c6SMartin Varghese } 164571912c6SMartin Varghese } 165571912c6SMartin Varghese 166571912c6SMartin Varghese len = skb->len; 167571912c6SMartin Varghese err = gro_cells_receive(&bareudp->gro_cells, skb); 168571912c6SMartin Varghese if (likely(err == NET_RX_SUCCESS)) { 169571912c6SMartin Varghese stats = this_cpu_ptr(bareudp->dev->tstats); 170571912c6SMartin Varghese u64_stats_update_begin(&stats->syncp); 171571912c6SMartin Varghese stats->rx_packets++; 172571912c6SMartin Varghese stats->rx_bytes += len; 173571912c6SMartin Varghese u64_stats_update_end(&stats->syncp); 174571912c6SMartin Varghese } 175571912c6SMartin Varghese return 0; 176571912c6SMartin Varghese drop: 177571912c6SMartin Varghese /* Consume bad packet */ 178571912c6SMartin Varghese kfree_skb(skb); 179571912c6SMartin Varghese 180571912c6SMartin Varghese return 0; 181571912c6SMartin Varghese } 182571912c6SMartin Varghese 183571912c6SMartin Varghese static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) 184571912c6SMartin Varghese { 185571912c6SMartin Varghese return 0; 186571912c6SMartin Varghese } 187571912c6SMartin Varghese 188571912c6SMartin Varghese static int bareudp_init(struct net_device *dev) 189571912c6SMartin Varghese { 190571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 191571912c6SMartin Varghese int err; 192571912c6SMartin Varghese 193571912c6SMartin Varghese dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 194571912c6SMartin Varghese if (!dev->tstats) 195571912c6SMartin Varghese return -ENOMEM; 196571912c6SMartin Varghese 197571912c6SMartin Varghese err = gro_cells_init(&bareudp->gro_cells, dev); 198571912c6SMartin Varghese if (err) { 199571912c6SMartin Varghese free_percpu(dev->tstats); 200571912c6SMartin Varghese return err; 201571912c6SMartin Varghese } 202571912c6SMartin Varghese return 0; 203571912c6SMartin Varghese } 204571912c6SMartin Varghese 205571912c6SMartin Varghese static void bareudp_uninit(struct net_device *dev) 206571912c6SMartin Varghese { 207571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 208571912c6SMartin Varghese 209571912c6SMartin Varghese gro_cells_destroy(&bareudp->gro_cells); 210571912c6SMartin Varghese free_percpu(dev->tstats); 211571912c6SMartin Varghese } 212571912c6SMartin Varghese 213571912c6SMartin Varghese static struct socket *bareudp_create_sock(struct net *net, __be16 port) 214571912c6SMartin Varghese { 215571912c6SMartin Varghese struct udp_port_cfg udp_conf; 216571912c6SMartin Varghese struct socket *sock; 217571912c6SMartin Varghese int err; 218571912c6SMartin Varghese 219571912c6SMartin Varghese memset(&udp_conf, 0, sizeof(udp_conf)); 220571912c6SMartin Varghese #if IS_ENABLED(CONFIG_IPV6) 221571912c6SMartin Varghese udp_conf.family = AF_INET6; 222571912c6SMartin Varghese #else 223571912c6SMartin Varghese udp_conf.family = AF_INET; 224571912c6SMartin Varghese #endif 225571912c6SMartin Varghese udp_conf.local_udp_port = port; 226571912c6SMartin Varghese /* Open UDP socket */ 227571912c6SMartin Varghese err = udp_sock_create(net, &udp_conf, &sock); 228571912c6SMartin Varghese if (err < 0) 229571912c6SMartin Varghese return ERR_PTR(err); 230571912c6SMartin Varghese 231571912c6SMartin Varghese return sock; 232571912c6SMartin Varghese } 233571912c6SMartin Varghese 234571912c6SMartin Varghese /* Create new listen socket if needed */ 235571912c6SMartin Varghese static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) 236571912c6SMartin Varghese { 237571912c6SMartin Varghese struct udp_tunnel_sock_cfg tunnel_cfg; 238571912c6SMartin Varghese struct socket *sock; 239571912c6SMartin Varghese 240571912c6SMartin Varghese sock = bareudp_create_sock(bareudp->net, port); 241571912c6SMartin Varghese if (IS_ERR(sock)) 242571912c6SMartin Varghese return PTR_ERR(sock); 243571912c6SMartin Varghese 244571912c6SMartin Varghese /* Mark socket as an encapsulation socket */ 245571912c6SMartin Varghese memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 246571912c6SMartin Varghese tunnel_cfg.sk_user_data = bareudp; 247571912c6SMartin Varghese tunnel_cfg.encap_type = 1; 248571912c6SMartin Varghese tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; 249571912c6SMartin Varghese tunnel_cfg.encap_err_lookup = bareudp_err_lookup; 250571912c6SMartin Varghese tunnel_cfg.encap_destroy = NULL; 251571912c6SMartin Varghese setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); 252571912c6SMartin Varghese 253571912c6SMartin Varghese if (sock->sk->sk_family == AF_INET6) 254571912c6SMartin Varghese udp_encap_enable(); 255571912c6SMartin Varghese 256571912c6SMartin Varghese rcu_assign_pointer(bareudp->sock, sock); 257571912c6SMartin Varghese return 0; 258571912c6SMartin Varghese } 259571912c6SMartin Varghese 260571912c6SMartin Varghese static int bareudp_open(struct net_device *dev) 261571912c6SMartin Varghese { 262571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 263571912c6SMartin Varghese int ret = 0; 264571912c6SMartin Varghese 265571912c6SMartin Varghese ret = bareudp_socket_create(bareudp, bareudp->port); 266571912c6SMartin Varghese return ret; 267571912c6SMartin Varghese } 268571912c6SMartin Varghese 269571912c6SMartin Varghese static void bareudp_sock_release(struct bareudp_dev *bareudp) 270571912c6SMartin Varghese { 271571912c6SMartin Varghese struct socket *sock; 272571912c6SMartin Varghese 273571912c6SMartin Varghese sock = bareudp->sock; 274571912c6SMartin Varghese rcu_assign_pointer(bareudp->sock, NULL); 275571912c6SMartin Varghese synchronize_net(); 276571912c6SMartin Varghese udp_tunnel_sock_release(sock); 277571912c6SMartin Varghese } 278571912c6SMartin Varghese 279571912c6SMartin Varghese static int bareudp_stop(struct net_device *dev) 280571912c6SMartin Varghese { 281571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 282571912c6SMartin Varghese 283571912c6SMartin Varghese bareudp_sock_release(bareudp); 284571912c6SMartin Varghese return 0; 285571912c6SMartin Varghese } 286571912c6SMartin Varghese 287571912c6SMartin Varghese static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, 288571912c6SMartin Varghese struct bareudp_dev *bareudp, 289571912c6SMartin Varghese const struct ip_tunnel_info *info) 290571912c6SMartin Varghese { 291571912c6SMartin Varghese bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 292571912c6SMartin Varghese bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 293571912c6SMartin Varghese struct socket *sock = rcu_dereference(bareudp->sock); 294571912c6SMartin Varghese bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 295571912c6SMartin Varghese const struct ip_tunnel_key *key = &info->key; 296571912c6SMartin Varghese struct rtable *rt; 297571912c6SMartin Varghese __be16 sport, df; 298571912c6SMartin Varghese int min_headroom; 299571912c6SMartin Varghese __u8 tos, ttl; 300571912c6SMartin Varghese __be32 saddr; 301571912c6SMartin Varghese int err; 302571912c6SMartin Varghese 303571912c6SMartin Varghese if (!sock) 304571912c6SMartin Varghese return -ESHUTDOWN; 305571912c6SMartin Varghese 306571912c6SMartin Varghese rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, 307571912c6SMartin Varghese IPPROTO_UDP, use_cache); 308571912c6SMartin Varghese 309571912c6SMartin Varghese if (IS_ERR(rt)) 310571912c6SMartin Varghese return PTR_ERR(rt); 311571912c6SMartin Varghese 312571912c6SMartin Varghese skb_tunnel_check_pmtu(skb, &rt->dst, 313571912c6SMartin Varghese BAREUDP_IPV4_HLEN + info->options_len); 314571912c6SMartin Varghese 315571912c6SMartin Varghese sport = udp_flow_src_port(bareudp->net, skb, 316571912c6SMartin Varghese bareudp->sport_min, USHRT_MAX, 317571912c6SMartin Varghese true); 318571912c6SMartin Varghese tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 319571912c6SMartin Varghese ttl = key->ttl; 320571912c6SMartin Varghese df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 321571912c6SMartin Varghese skb_scrub_packet(skb, xnet); 322571912c6SMartin Varghese 323c102b6fdSDavid S. Miller err = -ENOSPC; 324571912c6SMartin Varghese if (!skb_pull(skb, skb_network_offset(skb))) 325571912c6SMartin Varghese goto free_dst; 326571912c6SMartin Varghese 327571912c6SMartin Varghese min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + 328571912c6SMartin Varghese BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 329571912c6SMartin Varghese 330571912c6SMartin Varghese err = skb_cow_head(skb, min_headroom); 331571912c6SMartin Varghese if (unlikely(err)) 332571912c6SMartin Varghese goto free_dst; 333571912c6SMartin Varghese 334571912c6SMartin Varghese err = udp_tunnel_handle_offloads(skb, udp_sum); 335571912c6SMartin Varghese if (err) 336571912c6SMartin Varghese goto free_dst; 337571912c6SMartin Varghese 338571912c6SMartin Varghese skb_set_inner_protocol(skb, bareudp->ethertype); 339571912c6SMartin Varghese udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, 340571912c6SMartin Varghese tos, ttl, df, sport, bareudp->port, 341571912c6SMartin Varghese !net_eq(bareudp->net, dev_net(bareudp->dev)), 342571912c6SMartin Varghese !(info->key.tun_flags & TUNNEL_CSUM)); 343571912c6SMartin Varghese return 0; 344571912c6SMartin Varghese 345571912c6SMartin Varghese free_dst: 346571912c6SMartin Varghese dst_release(&rt->dst); 347571912c6SMartin Varghese return err; 348571912c6SMartin Varghese } 349571912c6SMartin Varghese 350571912c6SMartin Varghese #if IS_ENABLED(CONFIG_IPV6) 351571912c6SMartin Varghese static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 352571912c6SMartin Varghese struct bareudp_dev *bareudp, 353571912c6SMartin Varghese const struct ip_tunnel_info *info) 354571912c6SMartin Varghese { 355571912c6SMartin Varghese bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); 356571912c6SMartin Varghese bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 357571912c6SMartin Varghese struct socket *sock = rcu_dereference(bareudp->sock); 358571912c6SMartin Varghese bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 359571912c6SMartin Varghese const struct ip_tunnel_key *key = &info->key; 360571912c6SMartin Varghese struct dst_entry *dst = NULL; 361571912c6SMartin Varghese struct in6_addr saddr, daddr; 362571912c6SMartin Varghese int min_headroom; 363571912c6SMartin Varghese __u8 prio, ttl; 364571912c6SMartin Varghese __be16 sport; 365571912c6SMartin Varghese int err; 366571912c6SMartin Varghese 367571912c6SMartin Varghese if (!sock) 368571912c6SMartin Varghese return -ESHUTDOWN; 369571912c6SMartin Varghese 370571912c6SMartin Varghese dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, 371571912c6SMartin Varghese IPPROTO_UDP, use_cache); 372571912c6SMartin Varghese if (IS_ERR(dst)) 373571912c6SMartin Varghese return PTR_ERR(dst); 374571912c6SMartin Varghese 375571912c6SMartin Varghese skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len); 376571912c6SMartin Varghese 377571912c6SMartin Varghese sport = udp_flow_src_port(bareudp->net, skb, 378571912c6SMartin Varghese bareudp->sport_min, USHRT_MAX, 379571912c6SMartin Varghese true); 380571912c6SMartin Varghese prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 381571912c6SMartin Varghese ttl = key->ttl; 382571912c6SMartin Varghese 383571912c6SMartin Varghese skb_scrub_packet(skb, xnet); 384571912c6SMartin Varghese 385c102b6fdSDavid S. Miller err = -ENOSPC; 386571912c6SMartin Varghese if (!skb_pull(skb, skb_network_offset(skb))) 387571912c6SMartin Varghese goto free_dst; 388571912c6SMartin Varghese 389571912c6SMartin Varghese min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 390571912c6SMartin Varghese BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); 391571912c6SMartin Varghese 392571912c6SMartin Varghese err = skb_cow_head(skb, min_headroom); 393571912c6SMartin Varghese if (unlikely(err)) 394571912c6SMartin Varghese goto free_dst; 395571912c6SMartin Varghese 396571912c6SMartin Varghese err = udp_tunnel_handle_offloads(skb, udp_sum); 397571912c6SMartin Varghese if (err) 398571912c6SMartin Varghese goto free_dst; 399571912c6SMartin Varghese 400571912c6SMartin Varghese daddr = info->key.u.ipv6.dst; 401571912c6SMartin Varghese udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, 402571912c6SMartin Varghese &saddr, &daddr, prio, ttl, 403571912c6SMartin Varghese info->key.label, sport, bareudp->port, 404571912c6SMartin Varghese !(info->key.tun_flags & TUNNEL_CSUM)); 405571912c6SMartin Varghese return 0; 406571912c6SMartin Varghese 407571912c6SMartin Varghese free_dst: 408571912c6SMartin Varghese dst_release(dst); 409571912c6SMartin Varghese return err; 410571912c6SMartin Varghese } 411571912c6SMartin Varghese #endif 412571912c6SMartin Varghese 413571912c6SMartin Varghese static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) 414571912c6SMartin Varghese { 415571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 416571912c6SMartin Varghese struct ip_tunnel_info *info = NULL; 417571912c6SMartin Varghese int err; 418571912c6SMartin Varghese 419571912c6SMartin Varghese if (skb->protocol != bareudp->ethertype) { 4204b5f6723SMartin Varghese if (!bareudp->multi_proto_mode || 4214b5f6723SMartin Varghese (skb->protocol != htons(ETH_P_MPLS_MC) && 4224b5f6723SMartin Varghese skb->protocol != htons(ETH_P_IPV6))) { 423571912c6SMartin Varghese err = -EINVAL; 424571912c6SMartin Varghese goto tx_error; 425571912c6SMartin Varghese } 4264b5f6723SMartin Varghese } 427571912c6SMartin Varghese 428571912c6SMartin Varghese info = skb_tunnel_info(skb); 429571912c6SMartin Varghese if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 430571912c6SMartin Varghese err = -EINVAL; 431571912c6SMartin Varghese goto tx_error; 432571912c6SMartin Varghese } 433571912c6SMartin Varghese 434571912c6SMartin Varghese rcu_read_lock(); 435571912c6SMartin Varghese #if IS_ENABLED(CONFIG_IPV6) 436571912c6SMartin Varghese if (info->mode & IP_TUNNEL_INFO_IPV6) 437571912c6SMartin Varghese err = bareudp6_xmit_skb(skb, dev, bareudp, info); 438571912c6SMartin Varghese else 439571912c6SMartin Varghese #endif 440571912c6SMartin Varghese err = bareudp_xmit_skb(skb, dev, bareudp, info); 441571912c6SMartin Varghese 442571912c6SMartin Varghese rcu_read_unlock(); 443571912c6SMartin Varghese 444571912c6SMartin Varghese if (likely(!err)) 445571912c6SMartin Varghese return NETDEV_TX_OK; 446571912c6SMartin Varghese tx_error: 447571912c6SMartin Varghese dev_kfree_skb(skb); 448571912c6SMartin Varghese 449571912c6SMartin Varghese if (err == -ELOOP) 450571912c6SMartin Varghese dev->stats.collisions++; 451571912c6SMartin Varghese else if (err == -ENETUNREACH) 452571912c6SMartin Varghese dev->stats.tx_carrier_errors++; 453571912c6SMartin Varghese 454571912c6SMartin Varghese dev->stats.tx_errors++; 455571912c6SMartin Varghese return NETDEV_TX_OK; 456571912c6SMartin Varghese } 457571912c6SMartin Varghese 458571912c6SMartin Varghese static int bareudp_fill_metadata_dst(struct net_device *dev, 459571912c6SMartin Varghese struct sk_buff *skb) 460571912c6SMartin Varghese { 461571912c6SMartin Varghese struct ip_tunnel_info *info = skb_tunnel_info(skb); 462571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 463571912c6SMartin Varghese bool use_cache; 464571912c6SMartin Varghese 465571912c6SMartin Varghese use_cache = ip_tunnel_dst_cache_usable(skb, info); 466571912c6SMartin Varghese 467571912c6SMartin Varghese if (ip_tunnel_info_af(info) == AF_INET) { 468571912c6SMartin Varghese struct rtable *rt; 469571912c6SMartin Varghese __be32 saddr; 470571912c6SMartin Varghese 471571912c6SMartin Varghese rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, 472571912c6SMartin Varghese info, IPPROTO_UDP, use_cache); 473571912c6SMartin Varghese if (IS_ERR(rt)) 474571912c6SMartin Varghese return PTR_ERR(rt); 475571912c6SMartin Varghese 476571912c6SMartin Varghese ip_rt_put(rt); 477571912c6SMartin Varghese info->key.u.ipv4.src = saddr; 478571912c6SMartin Varghese #if IS_ENABLED(CONFIG_IPV6) 479571912c6SMartin Varghese } else if (ip_tunnel_info_af(info) == AF_INET6) { 480571912c6SMartin Varghese struct dst_entry *dst; 481571912c6SMartin Varghese struct in6_addr saddr; 482571912c6SMartin Varghese struct socket *sock = rcu_dereference(bareudp->sock); 483571912c6SMartin Varghese 484571912c6SMartin Varghese dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, 485571912c6SMartin Varghese &saddr, info, IPPROTO_UDP, 486571912c6SMartin Varghese use_cache); 487571912c6SMartin Varghese if (IS_ERR(dst)) 488571912c6SMartin Varghese return PTR_ERR(dst); 489571912c6SMartin Varghese 490571912c6SMartin Varghese dst_release(dst); 491571912c6SMartin Varghese info->key.u.ipv6.src = saddr; 492571912c6SMartin Varghese #endif 493571912c6SMartin Varghese } else { 494571912c6SMartin Varghese return -EINVAL; 495571912c6SMartin Varghese } 496571912c6SMartin Varghese 497571912c6SMartin Varghese info->key.tp_src = udp_flow_src_port(bareudp->net, skb, 498571912c6SMartin Varghese bareudp->sport_min, 499571912c6SMartin Varghese USHRT_MAX, true); 500571912c6SMartin Varghese info->key.tp_dst = bareudp->port; 501571912c6SMartin Varghese return 0; 502571912c6SMartin Varghese } 503571912c6SMartin Varghese 504571912c6SMartin Varghese static const struct net_device_ops bareudp_netdev_ops = { 505571912c6SMartin Varghese .ndo_init = bareudp_init, 506571912c6SMartin Varghese .ndo_uninit = bareudp_uninit, 507571912c6SMartin Varghese .ndo_open = bareudp_open, 508571912c6SMartin Varghese .ndo_stop = bareudp_stop, 509571912c6SMartin Varghese .ndo_start_xmit = bareudp_xmit, 510571912c6SMartin Varghese .ndo_get_stats64 = ip_tunnel_get_stats64, 511571912c6SMartin Varghese .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, 512571912c6SMartin Varghese }; 513571912c6SMartin Varghese 514571912c6SMartin Varghese static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { 515571912c6SMartin Varghese [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, 516571912c6SMartin Varghese [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, 517571912c6SMartin Varghese [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, 5184b5f6723SMartin Varghese [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, 519571912c6SMartin Varghese }; 520571912c6SMartin Varghese 521571912c6SMartin Varghese /* Info for udev, that this is a virtual tunnel endpoint */ 522571912c6SMartin Varghese static struct device_type bareudp_type = { 523571912c6SMartin Varghese .name = "bareudp", 524571912c6SMartin Varghese }; 525571912c6SMartin Varghese 526571912c6SMartin Varghese /* Initialize the device structure. */ 527571912c6SMartin Varghese static void bareudp_setup(struct net_device *dev) 528571912c6SMartin Varghese { 529571912c6SMartin Varghese dev->netdev_ops = &bareudp_netdev_ops; 530571912c6SMartin Varghese dev->needs_free_netdev = true; 531571912c6SMartin Varghese SET_NETDEV_DEVTYPE(dev, &bareudp_type); 532571912c6SMartin Varghese dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 533571912c6SMartin Varghese dev->features |= NETIF_F_RXCSUM; 534571912c6SMartin Varghese dev->features |= NETIF_F_GSO_SOFTWARE; 535571912c6SMartin Varghese dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 536571912c6SMartin Varghese dev->hw_features |= NETIF_F_GSO_SOFTWARE; 537571912c6SMartin Varghese dev->hard_header_len = 0; 538571912c6SMartin Varghese dev->addr_len = 0; 539571912c6SMartin Varghese dev->mtu = ETH_DATA_LEN; 540571912c6SMartin Varghese dev->min_mtu = IPV4_MIN_MTU; 541571912c6SMartin Varghese dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; 542571912c6SMartin Varghese dev->type = ARPHRD_NONE; 543571912c6SMartin Varghese netif_keep_dst(dev); 544571912c6SMartin Varghese dev->priv_flags |= IFF_NO_QUEUE; 545571912c6SMartin Varghese dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 546571912c6SMartin Varghese } 547571912c6SMartin Varghese 548571912c6SMartin Varghese static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], 549571912c6SMartin Varghese struct netlink_ext_ack *extack) 550571912c6SMartin Varghese { 551571912c6SMartin Varghese if (!data) { 552571912c6SMartin Varghese NL_SET_ERR_MSG(extack, 553571912c6SMartin Varghese "Not enough attributes provided to perform the operation"); 554571912c6SMartin Varghese return -EINVAL; 555571912c6SMartin Varghese } 556571912c6SMartin Varghese return 0; 557571912c6SMartin Varghese } 558571912c6SMartin Varghese 559*c46a49a4STaehee Yoo static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, 560*c46a49a4STaehee Yoo struct netlink_ext_ack *extack) 561571912c6SMartin Varghese { 562*c46a49a4STaehee Yoo if (!data[IFLA_BAREUDP_PORT]) { 563*c46a49a4STaehee Yoo NL_SET_ERR_MSG(extack, "port not specified"); 564571912c6SMartin Varghese return -EINVAL; 565*c46a49a4STaehee Yoo } 566*c46a49a4STaehee Yoo if (!data[IFLA_BAREUDP_ETHERTYPE]) { 567*c46a49a4STaehee Yoo NL_SET_ERR_MSG(extack, "ethertype not specified"); 568*c46a49a4STaehee Yoo return -EINVAL; 569*c46a49a4STaehee Yoo } 570571912c6SMartin Varghese 571571912c6SMartin Varghese if (data[IFLA_BAREUDP_PORT]) 572571912c6SMartin Varghese conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 573571912c6SMartin Varghese 574571912c6SMartin Varghese if (data[IFLA_BAREUDP_ETHERTYPE]) 575571912c6SMartin Varghese conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); 576571912c6SMartin Varghese 577571912c6SMartin Varghese if (data[IFLA_BAREUDP_SRCPORT_MIN]) 578571912c6SMartin Varghese conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); 579571912c6SMartin Varghese 580571912c6SMartin Varghese return 0; 581571912c6SMartin Varghese } 582571912c6SMartin Varghese 583571912c6SMartin Varghese static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, 584571912c6SMartin Varghese const struct bareudp_conf *conf) 585571912c6SMartin Varghese { 586571912c6SMartin Varghese struct bareudp_dev *bareudp, *t = NULL; 587571912c6SMartin Varghese 588571912c6SMartin Varghese list_for_each_entry(bareudp, &bn->bareudp_list, next) { 589571912c6SMartin Varghese if (conf->port == bareudp->port) 590571912c6SMartin Varghese t = bareudp; 591571912c6SMartin Varghese } 592571912c6SMartin Varghese return t; 593571912c6SMartin Varghese } 594571912c6SMartin Varghese 595571912c6SMartin Varghese static int bareudp_configure(struct net *net, struct net_device *dev, 596571912c6SMartin Varghese struct bareudp_conf *conf) 597571912c6SMartin Varghese { 598571912c6SMartin Varghese struct bareudp_net *bn = net_generic(net, bareudp_net_id); 599571912c6SMartin Varghese struct bareudp_dev *t, *bareudp = netdev_priv(dev); 600571912c6SMartin Varghese int err; 601571912c6SMartin Varghese 602571912c6SMartin Varghese bareudp->net = net; 603571912c6SMartin Varghese bareudp->dev = dev; 604571912c6SMartin Varghese t = bareudp_find_dev(bn, conf); 605571912c6SMartin Varghese if (t) 606571912c6SMartin Varghese return -EBUSY; 607571912c6SMartin Varghese 6084b5f6723SMartin Varghese if (conf->multi_proto_mode && 6094b5f6723SMartin Varghese (conf->ethertype != htons(ETH_P_MPLS_UC) && 6104b5f6723SMartin Varghese conf->ethertype != htons(ETH_P_IP))) 6114b5f6723SMartin Varghese return -EINVAL; 6124b5f6723SMartin Varghese 613571912c6SMartin Varghese bareudp->port = conf->port; 614571912c6SMartin Varghese bareudp->ethertype = conf->ethertype; 615571912c6SMartin Varghese bareudp->sport_min = conf->sport_min; 6164b5f6723SMartin Varghese bareudp->multi_proto_mode = conf->multi_proto_mode; 617571912c6SMartin Varghese err = register_netdevice(dev); 618571912c6SMartin Varghese if (err) 619571912c6SMartin Varghese return err; 620571912c6SMartin Varghese 621571912c6SMartin Varghese list_add(&bareudp->next, &bn->bareudp_list); 622571912c6SMartin Varghese return 0; 623571912c6SMartin Varghese } 624571912c6SMartin Varghese 625571912c6SMartin Varghese static int bareudp_link_config(struct net_device *dev, 626571912c6SMartin Varghese struct nlattr *tb[]) 627571912c6SMartin Varghese { 628571912c6SMartin Varghese int err; 629571912c6SMartin Varghese 630571912c6SMartin Varghese if (tb[IFLA_MTU]) { 631571912c6SMartin Varghese err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 632571912c6SMartin Varghese if (err) 633571912c6SMartin Varghese return err; 634571912c6SMartin Varghese } 635571912c6SMartin Varghese return 0; 636571912c6SMartin Varghese } 637571912c6SMartin Varghese 638571912c6SMartin Varghese static int bareudp_newlink(struct net *net, struct net_device *dev, 639571912c6SMartin Varghese struct nlattr *tb[], struct nlattr *data[], 640571912c6SMartin Varghese struct netlink_ext_ack *extack) 641571912c6SMartin Varghese { 642571912c6SMartin Varghese struct bareudp_conf conf; 643571912c6SMartin Varghese int err; 644571912c6SMartin Varghese 645*c46a49a4STaehee Yoo err = bareudp2info(data, &conf, extack); 646571912c6SMartin Varghese if (err) 647571912c6SMartin Varghese return err; 648571912c6SMartin Varghese 649571912c6SMartin Varghese err = bareudp_configure(net, dev, &conf); 650571912c6SMartin Varghese if (err) 651571912c6SMartin Varghese return err; 652571912c6SMartin Varghese 653571912c6SMartin Varghese err = bareudp_link_config(dev, tb); 654571912c6SMartin Varghese if (err) 655571912c6SMartin Varghese return err; 656571912c6SMartin Varghese 657571912c6SMartin Varghese return 0; 658571912c6SMartin Varghese } 659571912c6SMartin Varghese 660571912c6SMartin Varghese static void bareudp_dellink(struct net_device *dev, struct list_head *head) 661571912c6SMartin Varghese { 662571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 663571912c6SMartin Varghese 664571912c6SMartin Varghese list_del(&bareudp->next); 665571912c6SMartin Varghese unregister_netdevice_queue(dev, head); 666571912c6SMartin Varghese } 667571912c6SMartin Varghese 668571912c6SMartin Varghese static size_t bareudp_get_size(const struct net_device *dev) 669571912c6SMartin Varghese { 670571912c6SMartin Varghese return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ 671571912c6SMartin Varghese nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ 672571912c6SMartin Varghese nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ 6734b5f6723SMartin Varghese nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 674571912c6SMartin Varghese 0; 675571912c6SMartin Varghese } 676571912c6SMartin Varghese 677571912c6SMartin Varghese static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) 678571912c6SMartin Varghese { 679571912c6SMartin Varghese struct bareudp_dev *bareudp = netdev_priv(dev); 680571912c6SMartin Varghese 681571912c6SMartin Varghese if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) 682571912c6SMartin Varghese goto nla_put_failure; 683571912c6SMartin Varghese if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) 684571912c6SMartin Varghese goto nla_put_failure; 685571912c6SMartin Varghese if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) 686571912c6SMartin Varghese goto nla_put_failure; 6874b5f6723SMartin Varghese if (bareudp->multi_proto_mode && 6884b5f6723SMartin Varghese nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) 6894b5f6723SMartin Varghese goto nla_put_failure; 690571912c6SMartin Varghese 691571912c6SMartin Varghese return 0; 692571912c6SMartin Varghese 693571912c6SMartin Varghese nla_put_failure: 694571912c6SMartin Varghese return -EMSGSIZE; 695571912c6SMartin Varghese } 696571912c6SMartin Varghese 697571912c6SMartin Varghese static struct rtnl_link_ops bareudp_link_ops __read_mostly = { 698571912c6SMartin Varghese .kind = "bareudp", 699571912c6SMartin Varghese .maxtype = IFLA_BAREUDP_MAX, 700571912c6SMartin Varghese .policy = bareudp_policy, 701571912c6SMartin Varghese .priv_size = sizeof(struct bareudp_dev), 702571912c6SMartin Varghese .setup = bareudp_setup, 703571912c6SMartin Varghese .validate = bareudp_validate, 704571912c6SMartin Varghese .newlink = bareudp_newlink, 705571912c6SMartin Varghese .dellink = bareudp_dellink, 706571912c6SMartin Varghese .get_size = bareudp_get_size, 707571912c6SMartin Varghese .fill_info = bareudp_fill_info, 708571912c6SMartin Varghese }; 709571912c6SMartin Varghese 710571912c6SMartin Varghese struct net_device *bareudp_dev_create(struct net *net, const char *name, 711571912c6SMartin Varghese u8 name_assign_type, 712571912c6SMartin Varghese struct bareudp_conf *conf) 713571912c6SMartin Varghese { 714571912c6SMartin Varghese struct nlattr *tb[IFLA_MAX + 1]; 715571912c6SMartin Varghese struct net_device *dev; 716571912c6SMartin Varghese LIST_HEAD(list_kill); 717571912c6SMartin Varghese int err; 718571912c6SMartin Varghese 719571912c6SMartin Varghese memset(tb, 0, sizeof(tb)); 720571912c6SMartin Varghese dev = rtnl_create_link(net, name, name_assign_type, 721571912c6SMartin Varghese &bareudp_link_ops, tb, NULL); 722571912c6SMartin Varghese if (IS_ERR(dev)) 723571912c6SMartin Varghese return dev; 724571912c6SMartin Varghese 725571912c6SMartin Varghese err = bareudp_configure(net, dev, conf); 726571912c6SMartin Varghese if (err) { 727571912c6SMartin Varghese free_netdev(dev); 728571912c6SMartin Varghese return ERR_PTR(err); 729571912c6SMartin Varghese } 730571912c6SMartin Varghese err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN); 731571912c6SMartin Varghese if (err) 732571912c6SMartin Varghese goto err; 733571912c6SMartin Varghese 734571912c6SMartin Varghese err = rtnl_configure_link(dev, NULL); 735571912c6SMartin Varghese if (err < 0) 736571912c6SMartin Varghese goto err; 737571912c6SMartin Varghese 738571912c6SMartin Varghese return dev; 739571912c6SMartin Varghese err: 740571912c6SMartin Varghese bareudp_dellink(dev, &list_kill); 741571912c6SMartin Varghese unregister_netdevice_many(&list_kill); 742571912c6SMartin Varghese return ERR_PTR(err); 743571912c6SMartin Varghese } 744571912c6SMartin Varghese EXPORT_SYMBOL_GPL(bareudp_dev_create); 745571912c6SMartin Varghese 746571912c6SMartin Varghese static __net_init int bareudp_init_net(struct net *net) 747571912c6SMartin Varghese { 748571912c6SMartin Varghese struct bareudp_net *bn = net_generic(net, bareudp_net_id); 749571912c6SMartin Varghese 750571912c6SMartin Varghese INIT_LIST_HEAD(&bn->bareudp_list); 751571912c6SMartin Varghese return 0; 752571912c6SMartin Varghese } 753571912c6SMartin Varghese 754571912c6SMartin Varghese static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) 755571912c6SMartin Varghese { 756571912c6SMartin Varghese struct bareudp_net *bn = net_generic(net, bareudp_net_id); 757571912c6SMartin Varghese struct bareudp_dev *bareudp, *next; 758571912c6SMartin Varghese 759571912c6SMartin Varghese list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) 760571912c6SMartin Varghese unregister_netdevice_queue(bareudp->dev, head); 761571912c6SMartin Varghese } 762571912c6SMartin Varghese 763571912c6SMartin Varghese static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) 764571912c6SMartin Varghese { 765571912c6SMartin Varghese struct net *net; 766571912c6SMartin Varghese LIST_HEAD(list); 767571912c6SMartin Varghese 768571912c6SMartin Varghese rtnl_lock(); 769571912c6SMartin Varghese list_for_each_entry(net, net_list, exit_list) 770571912c6SMartin Varghese bareudp_destroy_tunnels(net, &list); 771571912c6SMartin Varghese 772571912c6SMartin Varghese /* unregister the devices gathered above */ 773571912c6SMartin Varghese unregister_netdevice_many(&list); 774571912c6SMartin Varghese rtnl_unlock(); 775571912c6SMartin Varghese } 776571912c6SMartin Varghese 777571912c6SMartin Varghese static struct pernet_operations bareudp_net_ops = { 778571912c6SMartin Varghese .init = bareudp_init_net, 779571912c6SMartin Varghese .exit_batch = bareudp_exit_batch_net, 780571912c6SMartin Varghese .id = &bareudp_net_id, 781571912c6SMartin Varghese .size = sizeof(struct bareudp_net), 782571912c6SMartin Varghese }; 783571912c6SMartin Varghese 784571912c6SMartin Varghese static int __init bareudp_init_module(void) 785571912c6SMartin Varghese { 786571912c6SMartin Varghese int rc; 787571912c6SMartin Varghese 788571912c6SMartin Varghese rc = register_pernet_subsys(&bareudp_net_ops); 789571912c6SMartin Varghese if (rc) 790571912c6SMartin Varghese goto out1; 791571912c6SMartin Varghese 792571912c6SMartin Varghese rc = rtnl_link_register(&bareudp_link_ops); 793571912c6SMartin Varghese if (rc) 794571912c6SMartin Varghese goto out2; 795571912c6SMartin Varghese 796571912c6SMartin Varghese return 0; 797571912c6SMartin Varghese out2: 798571912c6SMartin Varghese unregister_pernet_subsys(&bareudp_net_ops); 799571912c6SMartin Varghese out1: 800571912c6SMartin Varghese return rc; 801571912c6SMartin Varghese } 802571912c6SMartin Varghese late_initcall(bareudp_init_module); 803571912c6SMartin Varghese 804571912c6SMartin Varghese static void __exit bareudp_cleanup_module(void) 805571912c6SMartin Varghese { 806571912c6SMartin Varghese rtnl_link_unregister(&bareudp_link_ops); 807571912c6SMartin Varghese unregister_pernet_subsys(&bareudp_net_ops); 808571912c6SMartin Varghese } 809571912c6SMartin Varghese module_exit(bareudp_cleanup_module); 810571912c6SMartin Varghese 811eea45da4STaehee Yoo MODULE_ALIAS_RTNL_LINK("bareudp"); 812571912c6SMartin Varghese MODULE_LICENSE("GPL"); 813571912c6SMartin Varghese MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); 814571912c6SMartin Varghese MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); 815