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> |
| 21 | |
| 22 | #define GENEVE_NETDEV_VER "0.6" |
| 23 | |
| 24 | #define GENEVE_UDP_PORT 6081 |
| 25 | |
| 26 | #define GENEVE_N_VID (1u << 24) |
| 27 | #define GENEVE_VID_MASK (GENEVE_N_VID - 1) |
| 28 | |
| 29 | #define VNI_HASH_BITS 10 |
| 30 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
| 31 | |
| 32 | static bool log_ecn_error = true; |
| 33 | module_param(log_ecn_error, bool, 0644); |
| 34 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| 35 | |
| 36 | /* per-network namespace private data for this module */ |
| 37 | struct geneve_net { |
| 38 | struct list_head geneve_list; |
| 39 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 40 | struct geneve_dev __rcu *collect_md_tun; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | /* Pseudo network device */ |
| 44 | struct geneve_dev { |
| 45 | struct hlist_node hlist; /* vni hash table */ |
| 46 | struct net *net; /* netns for packet i/o */ |
| 47 | struct net_device *dev; /* netdev for geneve tunnel */ |
| 48 | struct geneve_sock *sock; /* socket used for geneve tunnel */ |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 49 | u8 vni[3]; /* virtual network ID for tunnel */ |
| 50 | u8 ttl; /* TTL override */ |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 51 | u8 tos; /* TOS override */ |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 52 | struct sockaddr_in remote; /* IPv4 address for link partner */ |
| 53 | struct list_head next; /* geneve's per namespace list */ |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 54 | __be16 dst_port; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 55 | bool collect_md; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | static int geneve_net_id; |
| 59 | |
| 60 | static inline __u32 geneve_net_vni_hash(u8 vni[3]) |
| 61 | { |
| 62 | __u32 vnid; |
| 63 | |
| 64 | vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 65 | return hash_32(vnid, VNI_HASH_BITS); |
| 66 | } |
| 67 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 68 | static __be64 vni_to_tunnel_id(const __u8 *vni) |
| 69 | { |
| 70 | #ifdef __BIG_ENDIAN |
| 71 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 72 | #else |
| 73 | return (__force __be64)(((__force u64)vni[0] << 40) | |
| 74 | ((__force u64)vni[1] << 48) | |
| 75 | ((__force u64)vni[2] << 56)); |
| 76 | #endif |
| 77 | } |
| 78 | |
| 79 | static struct geneve_dev *geneve_lookup(struct geneve_net *gn, |
| 80 | struct geneve_sock *gs, |
| 81 | struct iphdr *iph, |
| 82 | struct genevehdr *gnvh) |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 83 | { |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 84 | struct inet_sock *sk = inet_sk(gs->sock->sk); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 85 | struct hlist_head *vni_list_head; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 86 | struct geneve_dev *geneve; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 87 | __u32 hash; |
| 88 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 89 | geneve = rcu_dereference(gn->collect_md_tun); |
| 90 | if (geneve) |
| 91 | return geneve; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 92 | |
| 93 | /* Find the device for this VNI */ |
| 94 | hash = geneve_net_vni_hash(gnvh->vni); |
| 95 | vni_list_head = &gn->vni_list[hash]; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 96 | hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { |
| 97 | if (!memcmp(gnvh->vni, geneve->vni, sizeof(geneve->vni)) && |
| 98 | iph->saddr == geneve->remote.sin_addr.s_addr && |
| 99 | sk->inet_sport == geneve->dst_port) { |
| 100 | return geneve; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 101 | } |
| 102 | } |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 103 | return NULL; |
| 104 | } |
| 105 | |
| 106 | /* geneve receive/decap routine */ |
| 107 | static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) |
| 108 | { |
| 109 | struct genevehdr *gnvh = geneve_hdr(skb); |
| 110 | struct metadata_dst *tun_dst = NULL; |
| 111 | struct geneve_dev *geneve = NULL; |
| 112 | struct pcpu_sw_netstats *stats; |
| 113 | struct geneve_net *gn; |
| 114 | struct iphdr *iph; |
| 115 | int err; |
| 116 | |
| 117 | iph = ip_hdr(skb); /* Still outer IP header... */ |
| 118 | gn = gs->rcv_data; |
| 119 | geneve = geneve_lookup(gn, gs, iph, gnvh); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 120 | if (!geneve) |
| 121 | goto drop; |
| 122 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 123 | if (ip_tunnel_collect_metadata() || geneve->collect_md) { |
| 124 | __be16 flags; |
| 125 | void *opts; |
| 126 | |
| 127 | flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | |
| 128 | (gnvh->oam ? TUNNEL_OAM : 0) | |
| 129 | (gnvh->critical ? TUNNEL_CRIT_OPT : 0); |
| 130 | |
| 131 | tun_dst = udp_tun_rx_dst(skb, AF_INET, flags, |
| 132 | vni_to_tunnel_id(gnvh->vni), |
| 133 | gnvh->opt_len * 4); |
| 134 | if (!tun_dst) |
| 135 | goto drop; |
| 136 | |
| 137 | /* Update tunnel dst according to Geneve options. */ |
| 138 | opts = ip_tunnel_info_opts(&tun_dst->u.tun_info, |
| 139 | gnvh->opt_len * 4); |
| 140 | memcpy(opts, gnvh->options, gnvh->opt_len * 4); |
| 141 | } else { |
| 142 | /* Drop packets w/ critical options, |
| 143 | * since we don't support any... |
| 144 | */ |
| 145 | if (gnvh->critical) |
| 146 | goto drop; |
| 147 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 148 | |
| 149 | skb_reset_mac_header(skb); |
| 150 | skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev))); |
| 151 | skb->protocol = eth_type_trans(skb, geneve->dev); |
| 152 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 153 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 154 | if (tun_dst) |
| 155 | skb_dst_set(skb, &tun_dst->dst); |
| 156 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 157 | /* Ignore packet loops (and multicast echo) */ |
| 158 | if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) |
| 159 | goto drop; |
| 160 | |
| 161 | skb_reset_network_header(skb); |
| 162 | |
| 163 | iph = ip_hdr(skb); /* Now inner IP header... */ |
| 164 | err = IP_ECN_decapsulate(iph, skb); |
| 165 | |
| 166 | if (unlikely(err)) { |
| 167 | if (log_ecn_error) |
| 168 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| 169 | &iph->saddr, iph->tos); |
| 170 | if (err > 1) { |
| 171 | ++geneve->dev->stats.rx_frame_errors; |
| 172 | ++geneve->dev->stats.rx_errors; |
| 173 | goto drop; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | stats = this_cpu_ptr(geneve->dev->tstats); |
| 178 | u64_stats_update_begin(&stats->syncp); |
| 179 | stats->rx_packets++; |
| 180 | stats->rx_bytes += skb->len; |
| 181 | u64_stats_update_end(&stats->syncp); |
| 182 | |
| 183 | netif_rx(skb); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 184 | return; |
| 185 | drop: |
| 186 | /* Consume bad packet */ |
| 187 | kfree_skb(skb); |
| 188 | } |
| 189 | |
| 190 | /* Setup stats when device is created */ |
| 191 | static int geneve_init(struct net_device *dev) |
| 192 | { |
| 193 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 194 | if (!dev->tstats) |
| 195 | return -ENOMEM; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static void geneve_uninit(struct net_device *dev) |
| 200 | { |
| 201 | free_percpu(dev->tstats); |
| 202 | } |
| 203 | |
| 204 | static int geneve_open(struct net_device *dev) |
| 205 | { |
| 206 | struct geneve_dev *geneve = netdev_priv(dev); |
| 207 | struct net *net = geneve->net; |
| 208 | struct geneve_net *gn = net_generic(geneve->net, geneve_net_id); |
| 209 | struct geneve_sock *gs; |
| 210 | |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 211 | gs = geneve_sock_add(net, geneve->dst_port, geneve_rx, gn, |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 212 | false, false); |
| 213 | if (IS_ERR(gs)) |
| 214 | return PTR_ERR(gs); |
| 215 | |
| 216 | geneve->sock = gs; |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static int geneve_stop(struct net_device *dev) |
| 222 | { |
| 223 | struct geneve_dev *geneve = netdev_priv(dev); |
| 224 | struct geneve_sock *gs = geneve->sock; |
| 225 | |
| 226 | geneve_sock_release(gs); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 231 | static struct rtable *geneve_get_rt(struct sk_buff *skb, |
| 232 | struct net_device *dev, |
| 233 | struct flowi4 *fl4, |
| 234 | struct ip_tunnel_info *info) |
| 235 | { |
| 236 | struct geneve_dev *geneve = netdev_priv(dev); |
| 237 | struct rtable *rt = NULL; |
| 238 | __u8 tos; |
| 239 | |
| 240 | memset(fl4, 0, sizeof(*fl4)); |
| 241 | fl4->flowi4_mark = skb->mark; |
| 242 | fl4->flowi4_proto = IPPROTO_UDP; |
| 243 | |
| 244 | if (info) { |
| 245 | fl4->daddr = info->key.u.ipv4.dst; |
| 246 | fl4->saddr = info->key.u.ipv4.src; |
| 247 | fl4->flowi4_tos = RT_TOS(info->key.tos); |
| 248 | } else { |
| 249 | tos = geneve->tos; |
| 250 | if (tos == 1) { |
| 251 | const struct iphdr *iip = ip_hdr(skb); |
| 252 | |
| 253 | tos = ip_tunnel_get_dsfield(iip, skb); |
| 254 | } |
| 255 | |
| 256 | fl4->flowi4_tos = RT_TOS(tos); |
| 257 | fl4->daddr = geneve->remote.sin_addr.s_addr; |
| 258 | } |
| 259 | |
| 260 | rt = ip_route_output_key(geneve->net, fl4); |
| 261 | if (IS_ERR(rt)) { |
| 262 | netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); |
| 263 | dev->stats.tx_carrier_errors++; |
| 264 | return rt; |
| 265 | } |
| 266 | if (rt->dst.dev == dev) { /* is this necessary? */ |
| 267 | netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); |
| 268 | dev->stats.collisions++; |
| 269 | ip_rt_put(rt); |
| 270 | return ERR_PTR(-EINVAL); |
| 271 | } |
| 272 | |
| 273 | return rt; |
| 274 | } |
| 275 | |
| 276 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ |
| 277 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) |
| 278 | { |
| 279 | #ifdef __BIG_ENDIAN |
| 280 | vni[0] = (__force __u8)(tun_id >> 16); |
| 281 | vni[1] = (__force __u8)(tun_id >> 8); |
| 282 | vni[2] = (__force __u8)tun_id; |
| 283 | #else |
| 284 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); |
| 285 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); |
| 286 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); |
| 287 | #endif |
| 288 | } |
| 289 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 290 | static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) |
| 291 | { |
| 292 | struct geneve_dev *geneve = netdev_priv(dev); |
| 293 | struct geneve_sock *gs = geneve->sock; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 294 | struct ip_tunnel_info *info = NULL; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 295 | struct rtable *rt = NULL; |
| 296 | const struct iphdr *iip; /* interior IP header */ |
| 297 | struct flowi4 fl4; |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 298 | __u8 tos, ttl; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 299 | __be16 sport; |
| 300 | bool xnet; |
| 301 | int err; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 302 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 303 | sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 304 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 305 | if (geneve->collect_md) { |
| 306 | info = skb_tunnel_info(skb); |
| 307 | if (unlikely(info && info->mode != IP_TUNNEL_INFO_TX)) { |
| 308 | netdev_dbg(dev, "no tunnel metadata\n"); |
| 309 | goto tx_error; |
| 310 | } |
| 311 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 312 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 313 | rt = geneve_get_rt(skb, dev, &fl4, info); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 314 | if (IS_ERR(rt)) { |
| 315 | netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); |
| 316 | dev->stats.tx_carrier_errors++; |
| 317 | goto tx_error; |
| 318 | } |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 319 | skb_reset_mac_header(skb); |
| 320 | xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
| 321 | |
| 322 | if (info) { |
| 323 | const struct ip_tunnel_key *key = &info->key; |
| 324 | bool udp_csum; |
| 325 | u8 *opts = NULL; |
| 326 | u8 vni[3]; |
| 327 | __be16 df; |
| 328 | |
| 329 | tunnel_id_to_vni(key->tun_id, vni); |
| 330 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
| 331 | udp_csum = !!(key->tun_flags & TUNNEL_CSUM); |
| 332 | |
| 333 | if (key->tun_flags & TUNNEL_GENEVE_OPT) |
| 334 | opts = ip_tunnel_info_opts(info, info->options_len); |
| 335 | |
| 336 | err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr, |
| 337 | key->tos, key->ttl, df, |
| 338 | sport, geneve->dst_port, |
| 339 | key->tun_flags, vni, |
| 340 | info->options_len, opts, udp_csum, xnet); |
| 341 | } else { |
| 342 | iip = ip_hdr(skb); |
| 343 | tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); |
| 344 | |
| 345 | ttl = geneve->ttl; |
| 346 | if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) |
| 347 | ttl = 1; |
| 348 | |
| 349 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
| 350 | |
| 351 | /* no need to handle local destination and encap bypass...yet... */ |
| 352 | err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr, tos, |
| 353 | ttl, 0, sport, geneve->dst_port, 0, |
| 354 | geneve->vni, 0, NULL, false, xnet); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 355 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 356 | if (err < 0) |
| 357 | ip_rt_put(rt); |
| 358 | |
| 359 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 360 | return NETDEV_TX_OK; |
| 361 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 362 | tx_error: |
| 363 | dev->stats.tx_errors++; |
| 364 | dev_kfree_skb(skb); |
| 365 | return NETDEV_TX_OK; |
| 366 | } |
| 367 | |
| 368 | static const struct net_device_ops geneve_netdev_ops = { |
| 369 | .ndo_init = geneve_init, |
| 370 | .ndo_uninit = geneve_uninit, |
| 371 | .ndo_open = geneve_open, |
| 372 | .ndo_stop = geneve_stop, |
| 373 | .ndo_start_xmit = geneve_xmit, |
| 374 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
| 375 | .ndo_change_mtu = eth_change_mtu, |
| 376 | .ndo_validate_addr = eth_validate_addr, |
| 377 | .ndo_set_mac_address = eth_mac_addr, |
| 378 | }; |
| 379 | |
| 380 | static void geneve_get_drvinfo(struct net_device *dev, |
| 381 | struct ethtool_drvinfo *drvinfo) |
| 382 | { |
| 383 | strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); |
| 384 | strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); |
| 385 | } |
| 386 | |
| 387 | static const struct ethtool_ops geneve_ethtool_ops = { |
| 388 | .get_drvinfo = geneve_get_drvinfo, |
| 389 | .get_link = ethtool_op_get_link, |
| 390 | }; |
| 391 | |
| 392 | /* Info for udev, that this is a virtual tunnel endpoint */ |
| 393 | static struct device_type geneve_type = { |
| 394 | .name = "geneve", |
| 395 | }; |
| 396 | |
| 397 | /* Initialize the device structure. */ |
| 398 | static void geneve_setup(struct net_device *dev) |
| 399 | { |
| 400 | ether_setup(dev); |
| 401 | |
| 402 | dev->netdev_ops = &geneve_netdev_ops; |
| 403 | dev->ethtool_ops = &geneve_ethtool_ops; |
| 404 | dev->destructor = free_netdev; |
| 405 | |
| 406 | SET_NETDEV_DEVTYPE(dev, &geneve_type); |
| 407 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 408 | dev->features |= NETIF_F_LLTX; |
| 409 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| 410 | dev->features |= NETIF_F_RXCSUM; |
| 411 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 412 | |
| 413 | dev->vlan_features = dev->features; |
| 414 | dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| 415 | |
| 416 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| 417 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| 418 | dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| 419 | |
| 420 | netif_keep_dst(dev); |
Phil Sutter | ed961ac | 2015-08-18 10:30:31 +0200 | [diff] [blame] | 421 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
Pravin B Shelar | 87cd3dc | 2015-08-26 23:46:48 -0700 | [diff] [blame] | 422 | eth_hw_addr_random(dev); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { |
| 426 | [IFLA_GENEVE_ID] = { .type = NLA_U32 }, |
| 427 | [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 428 | [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 429 | [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 430 | [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 431 | [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 432 | }; |
| 433 | |
| 434 | static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 435 | { |
| 436 | if (tb[IFLA_ADDRESS]) { |
| 437 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 438 | return -EINVAL; |
| 439 | |
| 440 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 441 | return -EADDRNOTAVAIL; |
| 442 | } |
| 443 | |
| 444 | if (!data) |
| 445 | return -EINVAL; |
| 446 | |
| 447 | if (data[IFLA_GENEVE_ID]) { |
| 448 | __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 449 | |
| 450 | if (vni >= GENEVE_VID_MASK) |
| 451 | return -ERANGE; |
| 452 | } |
| 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 457 | static int geneve_configure(struct net *net, struct net_device *dev, |
| 458 | __be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos, |
| 459 | __u16 dst_port, bool metadata) |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 460 | { |
| 461 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 462 | struct geneve_dev *dummy, *geneve = netdev_priv(dev); |
| 463 | struct hlist_head *vni_list_head; |
| 464 | struct sockaddr_in remote; /* IPv4 address for link partner */ |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 465 | __u32 hash; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 466 | int err; |
| 467 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 468 | if (metadata) { |
| 469 | if (rtnl_dereference(gn->collect_md_tun)) |
| 470 | return -EEXIST; |
| 471 | if (!list_empty(&gn->geneve_list)) |
| 472 | return -EPERM; |
| 473 | } else { |
| 474 | if (rtnl_dereference(gn->collect_md_tun)) |
| 475 | return -EPERM; |
| 476 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 477 | |
| 478 | geneve->net = net; |
| 479 | geneve->dev = dev; |
| 480 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 481 | geneve->vni[0] = (vni & 0x00ff0000) >> 16; |
| 482 | geneve->vni[1] = (vni & 0x0000ff00) >> 8; |
| 483 | geneve->vni[2] = vni & 0x000000ff; |
| 484 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 485 | geneve->remote.sin_addr.s_addr = rem_addr; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 486 | if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr))) |
| 487 | return -EINVAL; |
| 488 | |
| 489 | remote = geneve->remote; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 490 | if (metadata) { |
| 491 | if (rem_addr || vni || tos || ttl) |
| 492 | return -EINVAL; |
| 493 | } |
| 494 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 495 | hash = geneve_net_vni_hash(geneve->vni); |
| 496 | vni_list_head = &gn->vni_list[hash]; |
| 497 | hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) { |
| 498 | if (!memcmp(geneve->vni, dummy->vni, sizeof(dummy->vni)) && |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 499 | !memcmp(&remote, &dummy->remote, sizeof(dummy->remote)) && |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 500 | htons(dst_port) == dummy->dst_port) { |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 501 | return -EBUSY; |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 502 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 503 | } |
| 504 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 505 | geneve->ttl = ttl; |
| 506 | geneve->tos = tos; |
| 507 | geneve->dst_port = htons(dst_port); |
| 508 | geneve->collect_md = metadata; |
| 509 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 510 | err = register_netdevice(dev); |
| 511 | if (err) |
| 512 | return err; |
| 513 | |
| 514 | list_add(&geneve->next, &gn->geneve_list); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 515 | hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]); |
| 516 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 517 | if (geneve->collect_md) |
| 518 | rcu_assign_pointer(gn->collect_md_tun, geneve); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 519 | return 0; |
| 520 | } |
| 521 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 522 | static int geneve_newlink(struct net *net, struct net_device *dev, |
| 523 | struct nlattr *tb[], struct nlattr *data[]) |
| 524 | { |
| 525 | __u16 dst_port = GENEVE_UDP_PORT; |
| 526 | __u8 ttl = 0, tos = 0; |
| 527 | bool metadata = false; |
| 528 | __be32 rem_addr; |
| 529 | __u32 vni; |
| 530 | |
| 531 | if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE]) |
| 532 | return -EINVAL; |
| 533 | |
| 534 | vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 535 | rem_addr = nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); |
| 536 | |
| 537 | if (data[IFLA_GENEVE_TTL]) |
| 538 | ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
| 539 | |
| 540 | if (data[IFLA_GENEVE_TOS]) |
| 541 | tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
| 542 | |
| 543 | if (data[IFLA_GENEVE_PORT]) |
| 544 | dst_port = nla_get_u16(data[IFLA_GENEVE_PORT]); |
| 545 | |
| 546 | if (data[IFLA_GENEVE_COLLECT_METADATA]) |
| 547 | metadata = true; |
| 548 | |
| 549 | return geneve_configure(net, dev, rem_addr, vni, |
| 550 | ttl, tos, dst_port, metadata); |
| 551 | } |
| 552 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 553 | static void geneve_dellink(struct net_device *dev, struct list_head *head) |
| 554 | { |
| 555 | struct geneve_dev *geneve = netdev_priv(dev); |
| 556 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 557 | if (geneve->collect_md) { |
| 558 | struct geneve_net *gn = net_generic(geneve->net, geneve_net_id); |
| 559 | |
| 560 | rcu_assign_pointer(gn->collect_md_tun, NULL); |
| 561 | } |
| 562 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 563 | if (!hlist_unhashed(&geneve->hlist)) |
| 564 | hlist_del_rcu(&geneve->hlist); |
| 565 | |
| 566 | list_del(&geneve->next); |
| 567 | unregister_netdevice_queue(dev, head); |
| 568 | } |
| 569 | |
| 570 | static size_t geneve_get_size(const struct net_device *dev) |
| 571 | { |
| 572 | return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ |
| 573 | nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */ |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 574 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 575 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 576 | nla_total_size(sizeof(__u16)) + /* IFLA_GENEVE_PORT */ |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 577 | nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 578 | 0; |
| 579 | } |
| 580 | |
| 581 | static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 582 | { |
| 583 | struct geneve_dev *geneve = netdev_priv(dev); |
| 584 | __u32 vni; |
| 585 | |
| 586 | vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; |
| 587 | if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) |
| 588 | goto nla_put_failure; |
| 589 | |
| 590 | if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, |
| 591 | geneve->remote.sin_addr.s_addr)) |
| 592 | goto nla_put_failure; |
| 593 | |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 594 | if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || |
| 595 | nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos)) |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 596 | goto nla_put_failure; |
| 597 | |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 598 | if (nla_put_u16(skb, IFLA_GENEVE_PORT, ntohs(geneve->dst_port))) |
| 599 | goto nla_put_failure; |
| 600 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 601 | if (geneve->collect_md) { |
| 602 | if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) |
| 603 | goto nla_put_failure; |
| 604 | } |
| 605 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 606 | return 0; |
| 607 | |
| 608 | nla_put_failure: |
| 609 | return -EMSGSIZE; |
| 610 | } |
| 611 | |
| 612 | static struct rtnl_link_ops geneve_link_ops __read_mostly = { |
| 613 | .kind = "geneve", |
| 614 | .maxtype = IFLA_GENEVE_MAX, |
| 615 | .policy = geneve_policy, |
| 616 | .priv_size = sizeof(struct geneve_dev), |
| 617 | .setup = geneve_setup, |
| 618 | .validate = geneve_validate, |
| 619 | .newlink = geneve_newlink, |
| 620 | .dellink = geneve_dellink, |
| 621 | .get_size = geneve_get_size, |
| 622 | .fill_info = geneve_fill_info, |
| 623 | }; |
| 624 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame^] | 625 | struct net_device *geneve_dev_create_fb(struct net *net, const char *name, |
| 626 | u8 name_assign_type, u16 dst_port) |
| 627 | { |
| 628 | struct nlattr *tb[IFLA_MAX + 1]; |
| 629 | struct net_device *dev; |
| 630 | int err; |
| 631 | |
| 632 | memset(tb, 0, sizeof(tb)); |
| 633 | dev = rtnl_create_link(net, name, name_assign_type, |
| 634 | &geneve_link_ops, tb); |
| 635 | if (IS_ERR(dev)) |
| 636 | return dev; |
| 637 | |
| 638 | err = geneve_configure(net, dev, 0, 0, 0, 0, dst_port, true); |
| 639 | if (err) { |
| 640 | free_netdev(dev); |
| 641 | return ERR_PTR(err); |
| 642 | } |
| 643 | return dev; |
| 644 | } |
| 645 | EXPORT_SYMBOL_GPL(geneve_dev_create_fb); |
| 646 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 647 | static __net_init int geneve_init_net(struct net *net) |
| 648 | { |
| 649 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 650 | unsigned int h; |
| 651 | |
| 652 | INIT_LIST_HEAD(&gn->geneve_list); |
| 653 | |
| 654 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
| 655 | INIT_HLIST_HEAD(&gn->vni_list[h]); |
| 656 | |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | static void __net_exit geneve_exit_net(struct net *net) |
| 661 | { |
| 662 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 663 | struct geneve_dev *geneve, *next; |
| 664 | struct net_device *dev, *aux; |
| 665 | LIST_HEAD(list); |
| 666 | |
| 667 | rtnl_lock(); |
| 668 | |
| 669 | /* gather any geneve devices that were moved into this ns */ |
| 670 | for_each_netdev_safe(net, dev, aux) |
| 671 | if (dev->rtnl_link_ops == &geneve_link_ops) |
| 672 | unregister_netdevice_queue(dev, &list); |
| 673 | |
| 674 | /* now gather any other geneve devices that were created in this ns */ |
| 675 | list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { |
| 676 | /* If geneve->dev is in the same netns, it was already added |
| 677 | * to the list by the previous loop. |
| 678 | */ |
| 679 | if (!net_eq(dev_net(geneve->dev), net)) |
| 680 | unregister_netdevice_queue(geneve->dev, &list); |
| 681 | } |
| 682 | |
| 683 | /* unregister the devices gathered above */ |
| 684 | unregister_netdevice_many(&list); |
| 685 | rtnl_unlock(); |
| 686 | } |
| 687 | |
| 688 | static struct pernet_operations geneve_net_ops = { |
| 689 | .init = geneve_init_net, |
| 690 | .exit = geneve_exit_net, |
| 691 | .id = &geneve_net_id, |
| 692 | .size = sizeof(struct geneve_net), |
| 693 | }; |
| 694 | |
| 695 | static int __init geneve_init_module(void) |
| 696 | { |
| 697 | int rc; |
| 698 | |
| 699 | rc = register_pernet_subsys(&geneve_net_ops); |
| 700 | if (rc) |
| 701 | goto out1; |
| 702 | |
| 703 | rc = rtnl_link_register(&geneve_link_ops); |
| 704 | if (rc) |
| 705 | goto out2; |
| 706 | |
| 707 | return 0; |
| 708 | out2: |
| 709 | unregister_pernet_subsys(&geneve_net_ops); |
| 710 | out1: |
| 711 | return rc; |
| 712 | } |
| 713 | late_initcall(geneve_init_module); |
| 714 | |
| 715 | static void __exit geneve_cleanup_module(void) |
| 716 | { |
| 717 | rtnl_link_unregister(&geneve_link_ops); |
| 718 | unregister_pernet_subsys(&geneve_net_ops); |
| 719 | } |
| 720 | module_exit(geneve_cleanup_module); |
| 721 | |
| 722 | MODULE_LICENSE("GPL"); |
| 723 | MODULE_VERSION(GENEVE_NETDEV_VER); |
| 724 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); |
| 725 | MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); |
| 726 | MODULE_ALIAS_RTNL_LINK("geneve"); |