John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 1 | /* |
| 2 | * GENEVE: Generic Network Virtualization Encapsulation |
| 3 | * |
| 4 | * Copyright (c) 2015 Red Hat, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/etherdevice.h> |
| 17 | #include <linux/hash.h> |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 18 | #include <net/dst_metadata.h> |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 19 | #include <net/rtnetlink.h> |
| 20 | #include <net/geneve.h> |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 21 | #include <net/protocol.h> |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 22 | |
| 23 | #define GENEVE_NETDEV_VER "0.6" |
| 24 | |
| 25 | #define GENEVE_UDP_PORT 6081 |
| 26 | |
| 27 | #define GENEVE_N_VID (1u << 24) |
| 28 | #define GENEVE_VID_MASK (GENEVE_N_VID - 1) |
| 29 | |
| 30 | #define VNI_HASH_BITS 10 |
| 31 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
| 32 | |
| 33 | static bool log_ecn_error = true; |
| 34 | module_param(log_ecn_error, bool, 0644); |
| 35 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| 36 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 37 | #define GENEVE_VER 0 |
| 38 | #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) |
| 39 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 40 | /* per-network namespace private data for this module */ |
| 41 | struct geneve_net { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 42 | struct list_head geneve_list; |
| 43 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
| 44 | struct list_head sock_list; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 45 | }; |
| 46 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 47 | static int geneve_net_id; |
| 48 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 49 | /* Pseudo network device */ |
| 50 | struct geneve_dev { |
| 51 | struct hlist_node hlist; /* vni hash table */ |
| 52 | struct net *net; /* netns for packet i/o */ |
| 53 | struct net_device *dev; /* netdev for geneve tunnel */ |
| 54 | struct geneve_sock *sock; /* socket used for geneve tunnel */ |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 55 | u8 vni[3]; /* virtual network ID for tunnel */ |
| 56 | u8 ttl; /* TTL override */ |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 57 | u8 tos; /* TOS override */ |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 58 | struct sockaddr_in remote; /* IPv4 address for link partner */ |
| 59 | struct list_head next; /* geneve's per namespace list */ |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 60 | __be16 dst_port; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 61 | bool collect_md; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 62 | }; |
| 63 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 64 | struct geneve_sock { |
| 65 | bool collect_md; |
| 66 | struct geneve_net *gn; |
| 67 | struct list_head list; |
| 68 | struct socket *sock; |
| 69 | struct rcu_head rcu; |
| 70 | int refcnt; |
| 71 | struct udp_offload udp_offloads; |
| 72 | }; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 73 | |
| 74 | static inline __u32 geneve_net_vni_hash(u8 vni[3]) |
| 75 | { |
| 76 | __u32 vnid; |
| 77 | |
| 78 | vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 79 | return hash_32(vnid, VNI_HASH_BITS); |
| 80 | } |
| 81 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 82 | static __be64 vni_to_tunnel_id(const __u8 *vni) |
| 83 | { |
| 84 | #ifdef __BIG_ENDIAN |
| 85 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 86 | #else |
| 87 | return (__force __be64)(((__force u64)vni[0] << 40) | |
| 88 | ((__force u64)vni[1] << 48) | |
| 89 | ((__force u64)vni[2] << 56)); |
| 90 | #endif |
| 91 | } |
| 92 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 93 | static struct geneve_dev *geneve_lookup(struct geneve_net *gn, __be16 port, |
| 94 | __be32 addr, u8 vni[]) |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 95 | { |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 96 | struct hlist_head *vni_list_head; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 97 | struct geneve_dev *geneve; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 98 | __u32 hash; |
| 99 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 100 | /* Find the device for this VNI */ |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 101 | hash = geneve_net_vni_hash(vni); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 102 | vni_list_head = &gn->vni_list[hash]; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 103 | hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 104 | if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
| 105 | addr == geneve->remote.sin_addr.s_addr && |
| 106 | port == geneve->dst_port) { |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 107 | return geneve; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 108 | } |
| 109 | } |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 110 | return NULL; |
| 111 | } |
| 112 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 113 | static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) |
| 114 | { |
| 115 | return (struct genevehdr *)(udp_hdr(skb) + 1); |
| 116 | } |
| 117 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 118 | /* geneve receive/decap routine */ |
| 119 | static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) |
| 120 | { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 121 | struct inet_sock *sk = inet_sk(gs->sock->sk); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 122 | struct genevehdr *gnvh = geneve_hdr(skb); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 123 | struct geneve_net *gn = gs->gn; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 124 | struct metadata_dst *tun_dst = NULL; |
| 125 | struct geneve_dev *geneve = NULL; |
| 126 | struct pcpu_sw_netstats *stats; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 127 | struct iphdr *iph; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 128 | u8 *vni; |
| 129 | __be32 addr; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 130 | int err; |
| 131 | |
| 132 | iph = ip_hdr(skb); /* Still outer IP header... */ |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 133 | |
| 134 | if (gs->collect_md) { |
| 135 | static u8 zero_vni[3]; |
| 136 | |
| 137 | vni = zero_vni; |
| 138 | addr = 0; |
| 139 | } else { |
| 140 | vni = gnvh->vni; |
| 141 | addr = iph->saddr; |
| 142 | } |
| 143 | |
| 144 | geneve = geneve_lookup(gn, sk->inet_sport, addr, vni); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 145 | if (!geneve) |
| 146 | goto drop; |
| 147 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 148 | if (ip_tunnel_collect_metadata() || gs->collect_md) { |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 149 | __be16 flags; |
| 150 | void *opts; |
| 151 | |
| 152 | flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | |
| 153 | (gnvh->oam ? TUNNEL_OAM : 0) | |
| 154 | (gnvh->critical ? TUNNEL_CRIT_OPT : 0); |
| 155 | |
| 156 | tun_dst = udp_tun_rx_dst(skb, AF_INET, flags, |
| 157 | vni_to_tunnel_id(gnvh->vni), |
| 158 | gnvh->opt_len * 4); |
| 159 | if (!tun_dst) |
| 160 | goto drop; |
| 161 | |
| 162 | /* Update tunnel dst according to Geneve options. */ |
| 163 | opts = ip_tunnel_info_opts(&tun_dst->u.tun_info, |
| 164 | gnvh->opt_len * 4); |
| 165 | memcpy(opts, gnvh->options, gnvh->opt_len * 4); |
| 166 | } else { |
| 167 | /* Drop packets w/ critical options, |
| 168 | * since we don't support any... |
| 169 | */ |
| 170 | if (gnvh->critical) |
| 171 | goto drop; |
| 172 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 173 | |
| 174 | skb_reset_mac_header(skb); |
| 175 | skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev))); |
| 176 | skb->protocol = eth_type_trans(skb, geneve->dev); |
| 177 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 178 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 179 | if (tun_dst) |
| 180 | skb_dst_set(skb, &tun_dst->dst); |
| 181 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 182 | /* Ignore packet loops (and multicast echo) */ |
| 183 | if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) |
| 184 | goto drop; |
| 185 | |
| 186 | skb_reset_network_header(skb); |
| 187 | |
| 188 | iph = ip_hdr(skb); /* Now inner IP header... */ |
| 189 | err = IP_ECN_decapsulate(iph, skb); |
| 190 | |
| 191 | if (unlikely(err)) { |
| 192 | if (log_ecn_error) |
| 193 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| 194 | &iph->saddr, iph->tos); |
| 195 | if (err > 1) { |
| 196 | ++geneve->dev->stats.rx_frame_errors; |
| 197 | ++geneve->dev->stats.rx_errors; |
| 198 | goto drop; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | stats = this_cpu_ptr(geneve->dev->tstats); |
| 203 | u64_stats_update_begin(&stats->syncp); |
| 204 | stats->rx_packets++; |
| 205 | stats->rx_bytes += skb->len; |
| 206 | u64_stats_update_end(&stats->syncp); |
| 207 | |
| 208 | netif_rx(skb); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 209 | return; |
| 210 | drop: |
| 211 | /* Consume bad packet */ |
| 212 | kfree_skb(skb); |
| 213 | } |
| 214 | |
| 215 | /* Setup stats when device is created */ |
| 216 | static int geneve_init(struct net_device *dev) |
| 217 | { |
| 218 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 219 | if (!dev->tstats) |
| 220 | return -ENOMEM; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static void geneve_uninit(struct net_device *dev) |
| 225 | { |
| 226 | free_percpu(dev->tstats); |
| 227 | } |
| 228 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 229 | /* Callback from net/ipv4/udp.c to receive packets */ |
| 230 | static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) |
| 231 | { |
| 232 | struct genevehdr *geneveh; |
| 233 | struct geneve_sock *gs; |
| 234 | int opts_len; |
| 235 | |
| 236 | /* Need Geneve and inner Ethernet header to be present */ |
| 237 | if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) |
| 238 | goto error; |
| 239 | |
| 240 | /* Return packets with reserved bits set */ |
| 241 | geneveh = geneve_hdr(skb); |
| 242 | if (unlikely(geneveh->ver != GENEVE_VER)) |
| 243 | goto error; |
| 244 | |
| 245 | if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) |
| 246 | goto error; |
| 247 | |
| 248 | opts_len = geneveh->opt_len * 4; |
| 249 | if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, |
| 250 | htons(ETH_P_TEB))) |
| 251 | goto drop; |
| 252 | |
| 253 | gs = rcu_dereference_sk_user_data(sk); |
| 254 | if (!gs) |
| 255 | goto drop; |
| 256 | |
| 257 | geneve_rx(gs, skb); |
| 258 | return 0; |
| 259 | |
| 260 | drop: |
| 261 | /* Consume bad packet */ |
| 262 | kfree_skb(skb); |
| 263 | return 0; |
| 264 | |
| 265 | error: |
| 266 | /* Let the UDP layer deal with the skb */ |
| 267 | return 1; |
| 268 | } |
| 269 | |
| 270 | static struct socket *geneve_create_sock(struct net *net, bool ipv6, |
| 271 | __be16 port) |
| 272 | { |
| 273 | struct socket *sock; |
| 274 | struct udp_port_cfg udp_conf; |
| 275 | int err; |
| 276 | |
| 277 | memset(&udp_conf, 0, sizeof(udp_conf)); |
| 278 | |
| 279 | if (ipv6) { |
| 280 | udp_conf.family = AF_INET6; |
| 281 | } else { |
| 282 | udp_conf.family = AF_INET; |
| 283 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); |
| 284 | } |
| 285 | |
| 286 | udp_conf.local_udp_port = port; |
| 287 | |
| 288 | /* Open UDP socket */ |
| 289 | err = udp_sock_create(net, &udp_conf, &sock); |
| 290 | if (err < 0) |
| 291 | return ERR_PTR(err); |
| 292 | |
| 293 | return sock; |
| 294 | } |
| 295 | |
| 296 | static void geneve_notify_add_rx_port(struct geneve_sock *gs) |
| 297 | { |
| 298 | struct sock *sk = gs->sock->sk; |
| 299 | sa_family_t sa_family = sk->sk_family; |
| 300 | int err; |
| 301 | |
| 302 | if (sa_family == AF_INET) { |
| 303 | err = udp_add_offload(&gs->udp_offloads); |
| 304 | if (err) |
| 305 | pr_warn("geneve: udp_add_offload failed with status %d\n", |
| 306 | err); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | static int geneve_hlen(struct genevehdr *gh) |
| 311 | { |
| 312 | return sizeof(*gh) + gh->opt_len * 4; |
| 313 | } |
| 314 | |
| 315 | static struct sk_buff **geneve_gro_receive(struct sk_buff **head, |
| 316 | struct sk_buff *skb, |
| 317 | struct udp_offload *uoff) |
| 318 | { |
| 319 | struct sk_buff *p, **pp = NULL; |
| 320 | struct genevehdr *gh, *gh2; |
| 321 | unsigned int hlen, gh_len, off_gnv; |
| 322 | const struct packet_offload *ptype; |
| 323 | __be16 type; |
| 324 | int flush = 1; |
| 325 | |
| 326 | off_gnv = skb_gro_offset(skb); |
| 327 | hlen = off_gnv + sizeof(*gh); |
| 328 | gh = skb_gro_header_fast(skb, off_gnv); |
| 329 | if (skb_gro_header_hard(skb, hlen)) { |
| 330 | gh = skb_gro_header_slow(skb, hlen, off_gnv); |
| 331 | if (unlikely(!gh)) |
| 332 | goto out; |
| 333 | } |
| 334 | |
| 335 | if (gh->ver != GENEVE_VER || gh->oam) |
| 336 | goto out; |
| 337 | gh_len = geneve_hlen(gh); |
| 338 | |
| 339 | hlen = off_gnv + gh_len; |
| 340 | if (skb_gro_header_hard(skb, hlen)) { |
| 341 | gh = skb_gro_header_slow(skb, hlen, off_gnv); |
| 342 | if (unlikely(!gh)) |
| 343 | goto out; |
| 344 | } |
| 345 | |
| 346 | flush = 0; |
| 347 | |
| 348 | for (p = *head; p; p = p->next) { |
| 349 | if (!NAPI_GRO_CB(p)->same_flow) |
| 350 | continue; |
| 351 | |
| 352 | gh2 = (struct genevehdr *)(p->data + off_gnv); |
| 353 | if (gh->opt_len != gh2->opt_len || |
| 354 | memcmp(gh, gh2, gh_len)) { |
| 355 | NAPI_GRO_CB(p)->same_flow = 0; |
| 356 | continue; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | type = gh->proto_type; |
| 361 | |
| 362 | rcu_read_lock(); |
| 363 | ptype = gro_find_receive_by_type(type); |
| 364 | if (!ptype) { |
| 365 | flush = 1; |
| 366 | goto out_unlock; |
| 367 | } |
| 368 | |
| 369 | skb_gro_pull(skb, gh_len); |
| 370 | skb_gro_postpull_rcsum(skb, gh, gh_len); |
| 371 | pp = ptype->callbacks.gro_receive(head, skb); |
| 372 | |
| 373 | out_unlock: |
| 374 | rcu_read_unlock(); |
| 375 | out: |
| 376 | NAPI_GRO_CB(skb)->flush |= flush; |
| 377 | |
| 378 | return pp; |
| 379 | } |
| 380 | |
| 381 | static int geneve_gro_complete(struct sk_buff *skb, int nhoff, |
| 382 | struct udp_offload *uoff) |
| 383 | { |
| 384 | struct genevehdr *gh; |
| 385 | struct packet_offload *ptype; |
| 386 | __be16 type; |
| 387 | int gh_len; |
| 388 | int err = -ENOSYS; |
| 389 | |
| 390 | udp_tunnel_gro_complete(skb, nhoff); |
| 391 | |
| 392 | gh = (struct genevehdr *)(skb->data + nhoff); |
| 393 | gh_len = geneve_hlen(gh); |
| 394 | type = gh->proto_type; |
| 395 | |
| 396 | rcu_read_lock(); |
| 397 | ptype = gro_find_complete_by_type(type); |
| 398 | if (ptype) |
| 399 | err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); |
| 400 | |
| 401 | rcu_read_unlock(); |
| 402 | return err; |
| 403 | } |
| 404 | |
| 405 | /* Create new listen socket if needed */ |
| 406 | static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, |
| 407 | bool ipv6) |
| 408 | { |
| 409 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 410 | struct geneve_sock *gs; |
| 411 | struct socket *sock; |
| 412 | struct udp_tunnel_sock_cfg tunnel_cfg; |
| 413 | |
| 414 | gs = kzalloc(sizeof(*gs), GFP_KERNEL); |
| 415 | if (!gs) |
| 416 | return ERR_PTR(-ENOMEM); |
| 417 | |
| 418 | sock = geneve_create_sock(net, ipv6, port); |
| 419 | if (IS_ERR(sock)) { |
| 420 | kfree(gs); |
| 421 | return ERR_CAST(sock); |
| 422 | } |
| 423 | |
| 424 | gs->sock = sock; |
| 425 | gs->refcnt = 1; |
| 426 | gs->gn = gn; |
| 427 | |
| 428 | /* Initialize the geneve udp offloads structure */ |
| 429 | gs->udp_offloads.port = port; |
| 430 | gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive; |
| 431 | gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete; |
| 432 | geneve_notify_add_rx_port(gs); |
| 433 | |
| 434 | /* Mark socket as an encapsulation socket */ |
| 435 | tunnel_cfg.sk_user_data = gs; |
| 436 | tunnel_cfg.encap_type = 1; |
| 437 | tunnel_cfg.encap_rcv = geneve_udp_encap_recv; |
| 438 | tunnel_cfg.encap_destroy = NULL; |
| 439 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
| 440 | |
| 441 | list_add(&gs->list, &gn->sock_list); |
| 442 | return gs; |
| 443 | } |
| 444 | |
| 445 | static void geneve_notify_del_rx_port(struct geneve_sock *gs) |
| 446 | { |
| 447 | struct sock *sk = gs->sock->sk; |
| 448 | sa_family_t sa_family = sk->sk_family; |
| 449 | |
| 450 | if (sa_family == AF_INET) |
| 451 | udp_del_offload(&gs->udp_offloads); |
| 452 | } |
| 453 | |
| 454 | static void geneve_sock_release(struct geneve_sock *gs) |
| 455 | { |
| 456 | if (--gs->refcnt) |
| 457 | return; |
| 458 | |
| 459 | list_del(&gs->list); |
| 460 | geneve_notify_del_rx_port(gs); |
| 461 | udp_tunnel_sock_release(gs->sock); |
| 462 | kfree_rcu(gs, rcu); |
| 463 | } |
| 464 | |
| 465 | static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, |
| 466 | __be16 dst_port) |
| 467 | { |
| 468 | struct geneve_sock *gs; |
| 469 | |
| 470 | list_for_each_entry(gs, &gn->sock_list, list) { |
| 471 | if (inet_sk(gs->sock->sk)->inet_sport == dst_port && |
| 472 | inet_sk(gs->sock->sk)->sk.sk_family == AF_INET) { |
| 473 | return gs; |
| 474 | } |
| 475 | } |
| 476 | return NULL; |
| 477 | } |
| 478 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 479 | static int geneve_open(struct net_device *dev) |
| 480 | { |
| 481 | struct geneve_dev *geneve = netdev_priv(dev); |
| 482 | struct net *net = geneve->net; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 483 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 484 | struct geneve_sock *gs; |
| 485 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 486 | gs = geneve_find_sock(gn, geneve->dst_port); |
| 487 | if (gs) { |
| 488 | gs->refcnt++; |
| 489 | goto out; |
| 490 | } |
| 491 | |
| 492 | gs = geneve_socket_create(net, geneve->dst_port, false); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 493 | if (IS_ERR(gs)) |
| 494 | return PTR_ERR(gs); |
| 495 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 496 | out: |
| 497 | gs->collect_md = geneve->collect_md; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 498 | geneve->sock = gs; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | static int geneve_stop(struct net_device *dev) |
| 503 | { |
| 504 | struct geneve_dev *geneve = netdev_priv(dev); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 505 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 506 | geneve_sock_release(geneve->sock); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 507 | return 0; |
| 508 | } |
| 509 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 510 | static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, |
| 511 | __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, |
| 512 | bool csum) |
| 513 | { |
| 514 | struct genevehdr *gnvh; |
| 515 | int min_headroom; |
| 516 | int err; |
| 517 | |
| 518 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len |
| 519 | + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); |
| 520 | err = skb_cow_head(skb, min_headroom); |
| 521 | if (unlikely(err)) { |
| 522 | kfree_skb(skb); |
| 523 | goto free_rt; |
| 524 | } |
| 525 | |
| 526 | skb = udp_tunnel_handle_offloads(skb, csum); |
| 527 | if (IS_ERR(skb)) { |
| 528 | err = PTR_ERR(skb); |
| 529 | goto free_rt; |
| 530 | } |
| 531 | |
| 532 | gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); |
| 533 | gnvh->ver = GENEVE_VER; |
| 534 | gnvh->opt_len = opt_len / 4; |
| 535 | gnvh->oam = !!(tun_flags & TUNNEL_OAM); |
| 536 | gnvh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); |
| 537 | gnvh->rsvd1 = 0; |
| 538 | memcpy(gnvh->vni, vni, 3); |
| 539 | gnvh->proto_type = htons(ETH_P_TEB); |
| 540 | gnvh->rsvd2 = 0; |
| 541 | memcpy(gnvh->options, opt, opt_len); |
| 542 | |
| 543 | skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| 544 | return 0; |
| 545 | |
| 546 | free_rt: |
| 547 | ip_rt_put(rt); |
| 548 | return err; |
| 549 | } |
| 550 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 551 | static struct rtable *geneve_get_rt(struct sk_buff *skb, |
| 552 | struct net_device *dev, |
| 553 | struct flowi4 *fl4, |
| 554 | struct ip_tunnel_info *info) |
| 555 | { |
| 556 | struct geneve_dev *geneve = netdev_priv(dev); |
| 557 | struct rtable *rt = NULL; |
| 558 | __u8 tos; |
| 559 | |
| 560 | memset(fl4, 0, sizeof(*fl4)); |
| 561 | fl4->flowi4_mark = skb->mark; |
| 562 | fl4->flowi4_proto = IPPROTO_UDP; |
| 563 | |
| 564 | if (info) { |
| 565 | fl4->daddr = info->key.u.ipv4.dst; |
| 566 | fl4->saddr = info->key.u.ipv4.src; |
| 567 | fl4->flowi4_tos = RT_TOS(info->key.tos); |
| 568 | } else { |
| 569 | tos = geneve->tos; |
| 570 | if (tos == 1) { |
| 571 | const struct iphdr *iip = ip_hdr(skb); |
| 572 | |
| 573 | tos = ip_tunnel_get_dsfield(iip, skb); |
| 574 | } |
| 575 | |
| 576 | fl4->flowi4_tos = RT_TOS(tos); |
| 577 | fl4->daddr = geneve->remote.sin_addr.s_addr; |
| 578 | } |
| 579 | |
| 580 | rt = ip_route_output_key(geneve->net, fl4); |
| 581 | if (IS_ERR(rt)) { |
| 582 | netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); |
| 583 | dev->stats.tx_carrier_errors++; |
| 584 | return rt; |
| 585 | } |
| 586 | if (rt->dst.dev == dev) { /* is this necessary? */ |
| 587 | netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); |
| 588 | dev->stats.collisions++; |
| 589 | ip_rt_put(rt); |
| 590 | return ERR_PTR(-EINVAL); |
| 591 | } |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 592 | return rt; |
| 593 | } |
| 594 | |
| 595 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ |
| 596 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) |
| 597 | { |
| 598 | #ifdef __BIG_ENDIAN |
| 599 | vni[0] = (__force __u8)(tun_id >> 16); |
| 600 | vni[1] = (__force __u8)(tun_id >> 8); |
| 601 | vni[2] = (__force __u8)tun_id; |
| 602 | #else |
| 603 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); |
| 604 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); |
| 605 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); |
| 606 | #endif |
| 607 | } |
| 608 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 609 | static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) |
| 610 | { |
| 611 | struct geneve_dev *geneve = netdev_priv(dev); |
| 612 | struct geneve_sock *gs = geneve->sock; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 613 | struct ip_tunnel_info *info = NULL; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 614 | struct rtable *rt = NULL; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 615 | struct flowi4 fl4; |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 616 | __u8 tos, ttl; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 617 | __be16 sport; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 618 | bool udp_csum; |
| 619 | __be16 df; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 620 | int err; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 621 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 622 | if (geneve->collect_md) { |
| 623 | info = skb_tunnel_info(skb); |
| 624 | if (unlikely(info && info->mode != IP_TUNNEL_INFO_TX)) { |
| 625 | netdev_dbg(dev, "no tunnel metadata\n"); |
| 626 | goto tx_error; |
| 627 | } |
| 628 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 629 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 630 | rt = geneve_get_rt(skb, dev, &fl4, info); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 631 | if (IS_ERR(rt)) { |
| 632 | netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); |
| 633 | dev->stats.tx_carrier_errors++; |
| 634 | goto tx_error; |
| 635 | } |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 636 | |
| 637 | sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 638 | skb_reset_mac_header(skb); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 639 | |
| 640 | if (info) { |
| 641 | const struct ip_tunnel_key *key = &info->key; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 642 | u8 *opts = NULL; |
| 643 | u8 vni[3]; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 644 | |
| 645 | tunnel_id_to_vni(key->tun_id, vni); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 646 | if (key->tun_flags & TUNNEL_GENEVE_OPT) |
| 647 | opts = ip_tunnel_info_opts(info, info->options_len); |
| 648 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 649 | udp_csum = !!(key->tun_flags & TUNNEL_CSUM); |
| 650 | err = geneve_build_skb(rt, skb, key->tun_flags, vni, |
| 651 | info->options_len, opts, udp_csum); |
| 652 | if (unlikely(err)) |
| 653 | goto err; |
| 654 | |
| 655 | tos = key->tos; |
| 656 | ttl = key->ttl; |
| 657 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 658 | } else { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 659 | const struct iphdr *iip; /* interior IP header */ |
| 660 | |
| 661 | udp_csum = false; |
| 662 | err = geneve_build_skb(rt, skb, 0, geneve->vni, |
| 663 | 0, NULL, udp_csum); |
| 664 | if (unlikely(err)) |
| 665 | goto err; |
| 666 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 667 | iip = ip_hdr(skb); |
| 668 | tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 669 | ttl = geneve->ttl; |
| 670 | if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) |
| 671 | ttl = 1; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 672 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 673 | df = 0; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 674 | } |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 675 | err = udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, fl4.saddr, fl4.daddr, |
| 676 | tos, ttl, df, sport, geneve->dst_port, |
| 677 | !net_eq(geneve->net, dev_net(geneve->dev)), |
| 678 | !udp_csum); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 679 | |
| 680 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 681 | return NETDEV_TX_OK; |
| 682 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 683 | tx_error: |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 684 | dev_kfree_skb(skb); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 685 | err: |
| 686 | dev->stats.tx_errors++; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 687 | return NETDEV_TX_OK; |
| 688 | } |
| 689 | |
| 690 | static const struct net_device_ops geneve_netdev_ops = { |
| 691 | .ndo_init = geneve_init, |
| 692 | .ndo_uninit = geneve_uninit, |
| 693 | .ndo_open = geneve_open, |
| 694 | .ndo_stop = geneve_stop, |
| 695 | .ndo_start_xmit = geneve_xmit, |
| 696 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
| 697 | .ndo_change_mtu = eth_change_mtu, |
| 698 | .ndo_validate_addr = eth_validate_addr, |
| 699 | .ndo_set_mac_address = eth_mac_addr, |
| 700 | }; |
| 701 | |
| 702 | static void geneve_get_drvinfo(struct net_device *dev, |
| 703 | struct ethtool_drvinfo *drvinfo) |
| 704 | { |
| 705 | strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); |
| 706 | strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); |
| 707 | } |
| 708 | |
| 709 | static const struct ethtool_ops geneve_ethtool_ops = { |
| 710 | .get_drvinfo = geneve_get_drvinfo, |
| 711 | .get_link = ethtool_op_get_link, |
| 712 | }; |
| 713 | |
| 714 | /* Info for udev, that this is a virtual tunnel endpoint */ |
| 715 | static struct device_type geneve_type = { |
| 716 | .name = "geneve", |
| 717 | }; |
| 718 | |
| 719 | /* Initialize the device structure. */ |
| 720 | static void geneve_setup(struct net_device *dev) |
| 721 | { |
| 722 | ether_setup(dev); |
| 723 | |
| 724 | dev->netdev_ops = &geneve_netdev_ops; |
| 725 | dev->ethtool_ops = &geneve_ethtool_ops; |
| 726 | dev->destructor = free_netdev; |
| 727 | |
| 728 | SET_NETDEV_DEVTYPE(dev, &geneve_type); |
| 729 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 730 | dev->features |= NETIF_F_LLTX; |
| 731 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| 732 | dev->features |= NETIF_F_RXCSUM; |
| 733 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 734 | |
| 735 | dev->vlan_features = dev->features; |
| 736 | dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| 737 | |
| 738 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| 739 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| 740 | dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| 741 | |
| 742 | netif_keep_dst(dev); |
Phil Sutter | ed961ac | 2015-08-18 10:30:31 +0200 | [diff] [blame] | 743 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
Pravin B Shelar | 87cd3dc | 2015-08-26 23:46:48 -0700 | [diff] [blame] | 744 | eth_hw_addr_random(dev); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 745 | } |
| 746 | |
| 747 | static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { |
| 748 | [IFLA_GENEVE_ID] = { .type = NLA_U32 }, |
| 749 | [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 750 | [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 751 | [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 752 | [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 753 | [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 754 | }; |
| 755 | |
| 756 | static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 757 | { |
| 758 | if (tb[IFLA_ADDRESS]) { |
| 759 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 760 | return -EINVAL; |
| 761 | |
| 762 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 763 | return -EADDRNOTAVAIL; |
| 764 | } |
| 765 | |
| 766 | if (!data) |
| 767 | return -EINVAL; |
| 768 | |
| 769 | if (data[IFLA_GENEVE_ID]) { |
| 770 | __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 771 | |
| 772 | if (vni >= GENEVE_VID_MASK) |
| 773 | return -ERANGE; |
| 774 | } |
| 775 | |
| 776 | return 0; |
| 777 | } |
| 778 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 779 | static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, |
| 780 | __be16 dst_port, |
| 781 | __be32 rem_addr, |
| 782 | u8 vni[], |
| 783 | bool *tun_on_same_port, |
| 784 | bool *tun_collect_md) |
| 785 | { |
| 786 | struct geneve_dev *geneve, *t; |
| 787 | |
| 788 | *tun_on_same_port = false; |
| 789 | *tun_collect_md = false; |
| 790 | t = NULL; |
| 791 | list_for_each_entry(geneve, &gn->geneve_list, next) { |
| 792 | if (geneve->dst_port == dst_port) { |
| 793 | *tun_collect_md = geneve->collect_md; |
| 794 | *tun_on_same_port = true; |
| 795 | } |
| 796 | if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
| 797 | rem_addr == geneve->remote.sin_addr.s_addr && |
| 798 | dst_port == geneve->dst_port) |
| 799 | t = geneve; |
| 800 | } |
| 801 | return t; |
| 802 | } |
| 803 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 804 | static int geneve_configure(struct net *net, struct net_device *dev, |
| 805 | __be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos, |
| 806 | __u16 dst_port, bool metadata) |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 807 | { |
| 808 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 809 | struct geneve_dev *t, *geneve = netdev_priv(dev); |
| 810 | bool tun_collect_md, tun_on_same_port; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 811 | __u32 hash; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 812 | int err; |
| 813 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 814 | if (metadata) { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 815 | if (rem_addr || vni || tos || ttl) |
| 816 | return -EINVAL; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 817 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 818 | |
| 819 | geneve->net = net; |
| 820 | geneve->dev = dev; |
| 821 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 822 | geneve->vni[0] = (vni & 0x00ff0000) >> 16; |
| 823 | geneve->vni[1] = (vni & 0x0000ff00) >> 8; |
| 824 | geneve->vni[2] = vni & 0x000000ff; |
| 825 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 826 | geneve->remote.sin_addr.s_addr = rem_addr; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 827 | if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr))) |
| 828 | return -EINVAL; |
| 829 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 830 | geneve->ttl = ttl; |
| 831 | geneve->tos = tos; |
| 832 | geneve->dst_port = htons(dst_port); |
| 833 | geneve->collect_md = metadata; |
| 834 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 835 | t = geneve_find_dev(gn, htons(dst_port), rem_addr, geneve->vni, |
| 836 | &tun_on_same_port, &tun_collect_md); |
| 837 | if (t) |
| 838 | return -EBUSY; |
| 839 | |
| 840 | if (metadata) { |
| 841 | if (tun_on_same_port) |
| 842 | return -EPERM; |
| 843 | } else { |
| 844 | if (tun_collect_md) |
| 845 | return -EPERM; |
| 846 | } |
| 847 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 848 | err = register_netdevice(dev); |
| 849 | if (err) |
| 850 | return err; |
| 851 | |
| 852 | list_add(&geneve->next, &gn->geneve_list); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 853 | hash = geneve_net_vni_hash(geneve->vni); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 854 | hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 855 | return 0; |
| 856 | } |
| 857 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 858 | static int geneve_newlink(struct net *net, struct net_device *dev, |
| 859 | struct nlattr *tb[], struct nlattr *data[]) |
| 860 | { |
| 861 | __u16 dst_port = GENEVE_UDP_PORT; |
| 862 | __u8 ttl = 0, tos = 0; |
| 863 | bool metadata = false; |
| 864 | __be32 rem_addr; |
| 865 | __u32 vni; |
| 866 | |
| 867 | if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE]) |
| 868 | return -EINVAL; |
| 869 | |
| 870 | vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 871 | rem_addr = nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); |
| 872 | |
| 873 | if (data[IFLA_GENEVE_TTL]) |
| 874 | ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
| 875 | |
| 876 | if (data[IFLA_GENEVE_TOS]) |
| 877 | tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
| 878 | |
| 879 | if (data[IFLA_GENEVE_PORT]) |
| 880 | dst_port = nla_get_u16(data[IFLA_GENEVE_PORT]); |
| 881 | |
| 882 | if (data[IFLA_GENEVE_COLLECT_METADATA]) |
| 883 | metadata = true; |
| 884 | |
| 885 | return geneve_configure(net, dev, rem_addr, vni, |
| 886 | ttl, tos, dst_port, metadata); |
| 887 | } |
| 888 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 889 | static void geneve_dellink(struct net_device *dev, struct list_head *head) |
| 890 | { |
| 891 | struct geneve_dev *geneve = netdev_priv(dev); |
| 892 | |
| 893 | if (!hlist_unhashed(&geneve->hlist)) |
| 894 | hlist_del_rcu(&geneve->hlist); |
| 895 | |
| 896 | list_del(&geneve->next); |
| 897 | unregister_netdevice_queue(dev, head); |
| 898 | } |
| 899 | |
| 900 | static size_t geneve_get_size(const struct net_device *dev) |
| 901 | { |
| 902 | return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ |
| 903 | nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */ |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 904 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 905 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 906 | nla_total_size(sizeof(__u16)) + /* IFLA_GENEVE_PORT */ |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 907 | nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 908 | 0; |
| 909 | } |
| 910 | |
| 911 | static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 912 | { |
| 913 | struct geneve_dev *geneve = netdev_priv(dev); |
| 914 | __u32 vni; |
| 915 | |
| 916 | vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; |
| 917 | if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) |
| 918 | goto nla_put_failure; |
| 919 | |
| 920 | if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, |
| 921 | geneve->remote.sin_addr.s_addr)) |
| 922 | goto nla_put_failure; |
| 923 | |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 924 | if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || |
| 925 | nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos)) |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 926 | goto nla_put_failure; |
| 927 | |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 928 | if (nla_put_u16(skb, IFLA_GENEVE_PORT, ntohs(geneve->dst_port))) |
| 929 | goto nla_put_failure; |
| 930 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 931 | if (geneve->collect_md) { |
| 932 | if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) |
| 933 | goto nla_put_failure; |
| 934 | } |
| 935 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 936 | return 0; |
| 937 | |
| 938 | nla_put_failure: |
| 939 | return -EMSGSIZE; |
| 940 | } |
| 941 | |
| 942 | static struct rtnl_link_ops geneve_link_ops __read_mostly = { |
| 943 | .kind = "geneve", |
| 944 | .maxtype = IFLA_GENEVE_MAX, |
| 945 | .policy = geneve_policy, |
| 946 | .priv_size = sizeof(struct geneve_dev), |
| 947 | .setup = geneve_setup, |
| 948 | .validate = geneve_validate, |
| 949 | .newlink = geneve_newlink, |
| 950 | .dellink = geneve_dellink, |
| 951 | .get_size = geneve_get_size, |
| 952 | .fill_info = geneve_fill_info, |
| 953 | }; |
| 954 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 955 | struct net_device *geneve_dev_create_fb(struct net *net, const char *name, |
| 956 | u8 name_assign_type, u16 dst_port) |
| 957 | { |
| 958 | struct nlattr *tb[IFLA_MAX + 1]; |
| 959 | struct net_device *dev; |
| 960 | int err; |
| 961 | |
| 962 | memset(tb, 0, sizeof(tb)); |
| 963 | dev = rtnl_create_link(net, name, name_assign_type, |
| 964 | &geneve_link_ops, tb); |
| 965 | if (IS_ERR(dev)) |
| 966 | return dev; |
| 967 | |
| 968 | err = geneve_configure(net, dev, 0, 0, 0, 0, dst_port, true); |
| 969 | if (err) { |
| 970 | free_netdev(dev); |
| 971 | return ERR_PTR(err); |
| 972 | } |
| 973 | return dev; |
| 974 | } |
| 975 | EXPORT_SYMBOL_GPL(geneve_dev_create_fb); |
| 976 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 977 | static __net_init int geneve_init_net(struct net *net) |
| 978 | { |
| 979 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 980 | unsigned int h; |
| 981 | |
| 982 | INIT_LIST_HEAD(&gn->geneve_list); |
| 983 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame^] | 984 | INIT_LIST_HEAD(&gn->sock_list); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 985 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
| 986 | INIT_HLIST_HEAD(&gn->vni_list[h]); |
| 987 | |
| 988 | return 0; |
| 989 | } |
| 990 | |
| 991 | static void __net_exit geneve_exit_net(struct net *net) |
| 992 | { |
| 993 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 994 | struct geneve_dev *geneve, *next; |
| 995 | struct net_device *dev, *aux; |
| 996 | LIST_HEAD(list); |
| 997 | |
| 998 | rtnl_lock(); |
| 999 | |
| 1000 | /* gather any geneve devices that were moved into this ns */ |
| 1001 | for_each_netdev_safe(net, dev, aux) |
| 1002 | if (dev->rtnl_link_ops == &geneve_link_ops) |
| 1003 | unregister_netdevice_queue(dev, &list); |
| 1004 | |
| 1005 | /* now gather any other geneve devices that were created in this ns */ |
| 1006 | list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { |
| 1007 | /* If geneve->dev is in the same netns, it was already added |
| 1008 | * to the list by the previous loop. |
| 1009 | */ |
| 1010 | if (!net_eq(dev_net(geneve->dev), net)) |
| 1011 | unregister_netdevice_queue(geneve->dev, &list); |
| 1012 | } |
| 1013 | |
| 1014 | /* unregister the devices gathered above */ |
| 1015 | unregister_netdevice_many(&list); |
| 1016 | rtnl_unlock(); |
| 1017 | } |
| 1018 | |
| 1019 | static struct pernet_operations geneve_net_ops = { |
| 1020 | .init = geneve_init_net, |
| 1021 | .exit = geneve_exit_net, |
| 1022 | .id = &geneve_net_id, |
| 1023 | .size = sizeof(struct geneve_net), |
| 1024 | }; |
| 1025 | |
| 1026 | static int __init geneve_init_module(void) |
| 1027 | { |
| 1028 | int rc; |
| 1029 | |
| 1030 | rc = register_pernet_subsys(&geneve_net_ops); |
| 1031 | if (rc) |
| 1032 | goto out1; |
| 1033 | |
| 1034 | rc = rtnl_link_register(&geneve_link_ops); |
| 1035 | if (rc) |
| 1036 | goto out2; |
| 1037 | |
| 1038 | return 0; |
| 1039 | out2: |
| 1040 | unregister_pernet_subsys(&geneve_net_ops); |
| 1041 | out1: |
| 1042 | return rc; |
| 1043 | } |
| 1044 | late_initcall(geneve_init_module); |
| 1045 | |
| 1046 | static void __exit geneve_cleanup_module(void) |
| 1047 | { |
| 1048 | rtnl_link_unregister(&geneve_link_ops); |
| 1049 | unregister_pernet_subsys(&geneve_net_ops); |
| 1050 | } |
| 1051 | module_exit(geneve_cleanup_module); |
| 1052 | |
| 1053 | MODULE_LICENSE("GPL"); |
| 1054 | MODULE_VERSION(GENEVE_NETDEV_VER); |
| 1055 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); |
| 1056 | MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); |
| 1057 | MODULE_ALIAS_RTNL_LINK("geneve"); |