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> |
Jesse Gross | 8e816df | 2015-08-28 16:54:40 -0700 | [diff] [blame^] | 19 | #include <net/gro_cells.h> |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 20 | #include <net/rtnetlink.h> |
| 21 | #include <net/geneve.h> |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 22 | #include <net/protocol.h> |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 23 | |
| 24 | #define GENEVE_NETDEV_VER "0.6" |
| 25 | |
| 26 | #define GENEVE_UDP_PORT 6081 |
| 27 | |
| 28 | #define GENEVE_N_VID (1u << 24) |
| 29 | #define GENEVE_VID_MASK (GENEVE_N_VID - 1) |
| 30 | |
| 31 | #define VNI_HASH_BITS 10 |
| 32 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
| 33 | |
| 34 | static bool log_ecn_error = true; |
| 35 | module_param(log_ecn_error, bool, 0644); |
| 36 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| 37 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 38 | #define GENEVE_VER 0 |
| 39 | #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) |
| 40 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 41 | /* per-network namespace private data for this module */ |
| 42 | struct geneve_net { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 43 | struct list_head geneve_list; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 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; |
Jesse Gross | 8e816df | 2015-08-28 16:54:40 -0700 | [diff] [blame^] | 62 | struct gro_cells gro_cells; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 63 | }; |
| 64 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 65 | struct geneve_sock { |
| 66 | bool collect_md; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 67 | struct list_head list; |
| 68 | struct socket *sock; |
| 69 | struct rcu_head rcu; |
| 70 | int refcnt; |
| 71 | struct udp_offload udp_offloads; |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 72 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 73 | }; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 74 | |
| 75 | static inline __u32 geneve_net_vni_hash(u8 vni[3]) |
| 76 | { |
| 77 | __u32 vnid; |
| 78 | |
| 79 | vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 80 | return hash_32(vnid, VNI_HASH_BITS); |
| 81 | } |
| 82 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 83 | static __be64 vni_to_tunnel_id(const __u8 *vni) |
| 84 | { |
| 85 | #ifdef __BIG_ENDIAN |
| 86 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 87 | #else |
| 88 | return (__force __be64)(((__force u64)vni[0] << 40) | |
| 89 | ((__force u64)vni[1] << 48) | |
| 90 | ((__force u64)vni[2] << 56)); |
| 91 | #endif |
| 92 | } |
| 93 | |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 94 | static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 95 | __be32 addr, u8 vni[]) |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 96 | { |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 97 | struct hlist_head *vni_list_head; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 98 | struct geneve_dev *geneve; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 99 | __u32 hash; |
| 100 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 101 | /* Find the device for this VNI */ |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 102 | hash = geneve_net_vni_hash(vni); |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 103 | vni_list_head = &gs->vni_list[hash]; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 104 | hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 105 | if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 106 | addr == geneve->remote.sin_addr.s_addr) |
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 | } |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 109 | return NULL; |
| 110 | } |
| 111 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 112 | static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) |
| 113 | { |
| 114 | return (struct genevehdr *)(udp_hdr(skb) + 1); |
| 115 | } |
| 116 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 117 | /* geneve receive/decap routine */ |
| 118 | static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb) |
| 119 | { |
| 120 | struct genevehdr *gnvh = geneve_hdr(skb); |
| 121 | struct metadata_dst *tun_dst = NULL; |
| 122 | struct geneve_dev *geneve = NULL; |
| 123 | struct pcpu_sw_netstats *stats; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 124 | struct iphdr *iph; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 125 | u8 *vni; |
| 126 | __be32 addr; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 127 | int err; |
| 128 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 129 | if (gs->collect_md) { |
| 130 | static u8 zero_vni[3]; |
| 131 | |
| 132 | vni = zero_vni; |
| 133 | addr = 0; |
| 134 | } else { |
| 135 | vni = gnvh->vni; |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 136 | iph = ip_hdr(skb); /* Still outer IP header... */ |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 137 | addr = iph->saddr; |
| 138 | } |
| 139 | |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 140 | geneve = geneve_lookup(gs, addr, vni); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 141 | if (!geneve) |
| 142 | goto drop; |
| 143 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 144 | if (ip_tunnel_collect_metadata() || gs->collect_md) { |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 145 | __be16 flags; |
| 146 | void *opts; |
| 147 | |
| 148 | flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | |
| 149 | (gnvh->oam ? TUNNEL_OAM : 0) | |
| 150 | (gnvh->critical ? TUNNEL_CRIT_OPT : 0); |
| 151 | |
| 152 | tun_dst = udp_tun_rx_dst(skb, AF_INET, flags, |
| 153 | vni_to_tunnel_id(gnvh->vni), |
| 154 | gnvh->opt_len * 4); |
| 155 | if (!tun_dst) |
| 156 | goto drop; |
| 157 | |
| 158 | /* Update tunnel dst according to Geneve options. */ |
| 159 | opts = ip_tunnel_info_opts(&tun_dst->u.tun_info, |
| 160 | gnvh->opt_len * 4); |
| 161 | memcpy(opts, gnvh->options, gnvh->opt_len * 4); |
| 162 | } else { |
| 163 | /* Drop packets w/ critical options, |
| 164 | * since we don't support any... |
| 165 | */ |
| 166 | if (gnvh->critical) |
| 167 | goto drop; |
| 168 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 169 | |
| 170 | skb_reset_mac_header(skb); |
| 171 | skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev))); |
| 172 | skb->protocol = eth_type_trans(skb, geneve->dev); |
| 173 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 174 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 175 | if (tun_dst) |
| 176 | skb_dst_set(skb, &tun_dst->dst); |
| 177 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 178 | /* Ignore packet loops (and multicast echo) */ |
| 179 | if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) |
| 180 | goto drop; |
| 181 | |
| 182 | skb_reset_network_header(skb); |
| 183 | |
| 184 | iph = ip_hdr(skb); /* Now inner IP header... */ |
| 185 | err = IP_ECN_decapsulate(iph, skb); |
| 186 | |
| 187 | if (unlikely(err)) { |
| 188 | if (log_ecn_error) |
| 189 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| 190 | &iph->saddr, iph->tos); |
| 191 | if (err > 1) { |
| 192 | ++geneve->dev->stats.rx_frame_errors; |
| 193 | ++geneve->dev->stats.rx_errors; |
| 194 | goto drop; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | stats = this_cpu_ptr(geneve->dev->tstats); |
| 199 | u64_stats_update_begin(&stats->syncp); |
| 200 | stats->rx_packets++; |
| 201 | stats->rx_bytes += skb->len; |
| 202 | u64_stats_update_end(&stats->syncp); |
| 203 | |
Jesse Gross | 8e816df | 2015-08-28 16:54:40 -0700 | [diff] [blame^] | 204 | gro_cells_receive(&geneve->gro_cells, skb); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 205 | return; |
| 206 | drop: |
| 207 | /* Consume bad packet */ |
| 208 | kfree_skb(skb); |
| 209 | } |
| 210 | |
| 211 | /* Setup stats when device is created */ |
| 212 | static int geneve_init(struct net_device *dev) |
| 213 | { |
Jesse Gross | 8e816df | 2015-08-28 16:54:40 -0700 | [diff] [blame^] | 214 | struct geneve_dev *geneve = netdev_priv(dev); |
| 215 | int err; |
| 216 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 217 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 218 | if (!dev->tstats) |
| 219 | return -ENOMEM; |
Jesse Gross | 8e816df | 2015-08-28 16:54:40 -0700 | [diff] [blame^] | 220 | |
| 221 | err = gro_cells_init(&geneve->gro_cells, dev); |
| 222 | if (err) { |
| 223 | free_percpu(dev->tstats); |
| 224 | return err; |
| 225 | } |
| 226 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static void geneve_uninit(struct net_device *dev) |
| 231 | { |
Jesse Gross | 8e816df | 2015-08-28 16:54:40 -0700 | [diff] [blame^] | 232 | struct geneve_dev *geneve = netdev_priv(dev); |
| 233 | |
| 234 | gro_cells_destroy(&geneve->gro_cells); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 235 | free_percpu(dev->tstats); |
| 236 | } |
| 237 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 238 | /* Callback from net/ipv4/udp.c to receive packets */ |
| 239 | static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) |
| 240 | { |
| 241 | struct genevehdr *geneveh; |
| 242 | struct geneve_sock *gs; |
| 243 | int opts_len; |
| 244 | |
| 245 | /* Need Geneve and inner Ethernet header to be present */ |
| 246 | if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) |
| 247 | goto error; |
| 248 | |
| 249 | /* Return packets with reserved bits set */ |
| 250 | geneveh = geneve_hdr(skb); |
| 251 | if (unlikely(geneveh->ver != GENEVE_VER)) |
| 252 | goto error; |
| 253 | |
| 254 | if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) |
| 255 | goto error; |
| 256 | |
| 257 | opts_len = geneveh->opt_len * 4; |
| 258 | if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, |
| 259 | htons(ETH_P_TEB))) |
| 260 | goto drop; |
| 261 | |
| 262 | gs = rcu_dereference_sk_user_data(sk); |
| 263 | if (!gs) |
| 264 | goto drop; |
| 265 | |
| 266 | geneve_rx(gs, skb); |
| 267 | return 0; |
| 268 | |
| 269 | drop: |
| 270 | /* Consume bad packet */ |
| 271 | kfree_skb(skb); |
| 272 | return 0; |
| 273 | |
| 274 | error: |
| 275 | /* Let the UDP layer deal with the skb */ |
| 276 | return 1; |
| 277 | } |
| 278 | |
| 279 | static struct socket *geneve_create_sock(struct net *net, bool ipv6, |
| 280 | __be16 port) |
| 281 | { |
| 282 | struct socket *sock; |
| 283 | struct udp_port_cfg udp_conf; |
| 284 | int err; |
| 285 | |
| 286 | memset(&udp_conf, 0, sizeof(udp_conf)); |
| 287 | |
| 288 | if (ipv6) { |
| 289 | udp_conf.family = AF_INET6; |
| 290 | } else { |
| 291 | udp_conf.family = AF_INET; |
| 292 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); |
| 293 | } |
| 294 | |
| 295 | udp_conf.local_udp_port = port; |
| 296 | |
| 297 | /* Open UDP socket */ |
| 298 | err = udp_sock_create(net, &udp_conf, &sock); |
| 299 | if (err < 0) |
| 300 | return ERR_PTR(err); |
| 301 | |
| 302 | return sock; |
| 303 | } |
| 304 | |
| 305 | static void geneve_notify_add_rx_port(struct geneve_sock *gs) |
| 306 | { |
| 307 | struct sock *sk = gs->sock->sk; |
| 308 | sa_family_t sa_family = sk->sk_family; |
| 309 | int err; |
| 310 | |
| 311 | if (sa_family == AF_INET) { |
| 312 | err = udp_add_offload(&gs->udp_offloads); |
| 313 | if (err) |
| 314 | pr_warn("geneve: udp_add_offload failed with status %d\n", |
| 315 | err); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | static int geneve_hlen(struct genevehdr *gh) |
| 320 | { |
| 321 | return sizeof(*gh) + gh->opt_len * 4; |
| 322 | } |
| 323 | |
| 324 | static struct sk_buff **geneve_gro_receive(struct sk_buff **head, |
| 325 | struct sk_buff *skb, |
| 326 | struct udp_offload *uoff) |
| 327 | { |
| 328 | struct sk_buff *p, **pp = NULL; |
| 329 | struct genevehdr *gh, *gh2; |
| 330 | unsigned int hlen, gh_len, off_gnv; |
| 331 | const struct packet_offload *ptype; |
| 332 | __be16 type; |
| 333 | int flush = 1; |
| 334 | |
| 335 | off_gnv = skb_gro_offset(skb); |
| 336 | hlen = off_gnv + sizeof(*gh); |
| 337 | gh = skb_gro_header_fast(skb, off_gnv); |
| 338 | if (skb_gro_header_hard(skb, hlen)) { |
| 339 | gh = skb_gro_header_slow(skb, hlen, off_gnv); |
| 340 | if (unlikely(!gh)) |
| 341 | goto out; |
| 342 | } |
| 343 | |
| 344 | if (gh->ver != GENEVE_VER || gh->oam) |
| 345 | goto out; |
| 346 | gh_len = geneve_hlen(gh); |
| 347 | |
| 348 | hlen = off_gnv + gh_len; |
| 349 | if (skb_gro_header_hard(skb, hlen)) { |
| 350 | gh = skb_gro_header_slow(skb, hlen, off_gnv); |
| 351 | if (unlikely(!gh)) |
| 352 | goto out; |
| 353 | } |
| 354 | |
| 355 | flush = 0; |
| 356 | |
| 357 | for (p = *head; p; p = p->next) { |
| 358 | if (!NAPI_GRO_CB(p)->same_flow) |
| 359 | continue; |
| 360 | |
| 361 | gh2 = (struct genevehdr *)(p->data + off_gnv); |
| 362 | if (gh->opt_len != gh2->opt_len || |
| 363 | memcmp(gh, gh2, gh_len)) { |
| 364 | NAPI_GRO_CB(p)->same_flow = 0; |
| 365 | continue; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | type = gh->proto_type; |
| 370 | |
| 371 | rcu_read_lock(); |
| 372 | ptype = gro_find_receive_by_type(type); |
| 373 | if (!ptype) { |
| 374 | flush = 1; |
| 375 | goto out_unlock; |
| 376 | } |
| 377 | |
| 378 | skb_gro_pull(skb, gh_len); |
| 379 | skb_gro_postpull_rcsum(skb, gh, gh_len); |
| 380 | pp = ptype->callbacks.gro_receive(head, skb); |
| 381 | |
| 382 | out_unlock: |
| 383 | rcu_read_unlock(); |
| 384 | out: |
| 385 | NAPI_GRO_CB(skb)->flush |= flush; |
| 386 | |
| 387 | return pp; |
| 388 | } |
| 389 | |
| 390 | static int geneve_gro_complete(struct sk_buff *skb, int nhoff, |
| 391 | struct udp_offload *uoff) |
| 392 | { |
| 393 | struct genevehdr *gh; |
| 394 | struct packet_offload *ptype; |
| 395 | __be16 type; |
| 396 | int gh_len; |
| 397 | int err = -ENOSYS; |
| 398 | |
| 399 | udp_tunnel_gro_complete(skb, nhoff); |
| 400 | |
| 401 | gh = (struct genevehdr *)(skb->data + nhoff); |
| 402 | gh_len = geneve_hlen(gh); |
| 403 | type = gh->proto_type; |
| 404 | |
| 405 | rcu_read_lock(); |
| 406 | ptype = gro_find_complete_by_type(type); |
| 407 | if (ptype) |
| 408 | err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); |
| 409 | |
| 410 | rcu_read_unlock(); |
| 411 | return err; |
| 412 | } |
| 413 | |
| 414 | /* Create new listen socket if needed */ |
| 415 | static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, |
| 416 | bool ipv6) |
| 417 | { |
| 418 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 419 | struct geneve_sock *gs; |
| 420 | struct socket *sock; |
| 421 | struct udp_tunnel_sock_cfg tunnel_cfg; |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 422 | int h; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 423 | |
| 424 | gs = kzalloc(sizeof(*gs), GFP_KERNEL); |
| 425 | if (!gs) |
| 426 | return ERR_PTR(-ENOMEM); |
| 427 | |
| 428 | sock = geneve_create_sock(net, ipv6, port); |
| 429 | if (IS_ERR(sock)) { |
| 430 | kfree(gs); |
| 431 | return ERR_CAST(sock); |
| 432 | } |
| 433 | |
| 434 | gs->sock = sock; |
| 435 | gs->refcnt = 1; |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 436 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
| 437 | INIT_HLIST_HEAD(&gs->vni_list[h]); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 438 | |
| 439 | /* Initialize the geneve udp offloads structure */ |
| 440 | gs->udp_offloads.port = port; |
| 441 | gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive; |
| 442 | gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete; |
| 443 | geneve_notify_add_rx_port(gs); |
| 444 | |
| 445 | /* Mark socket as an encapsulation socket */ |
| 446 | tunnel_cfg.sk_user_data = gs; |
| 447 | tunnel_cfg.encap_type = 1; |
| 448 | tunnel_cfg.encap_rcv = geneve_udp_encap_recv; |
| 449 | tunnel_cfg.encap_destroy = NULL; |
| 450 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 451 | list_add(&gs->list, &gn->sock_list); |
| 452 | return gs; |
| 453 | } |
| 454 | |
| 455 | static void geneve_notify_del_rx_port(struct geneve_sock *gs) |
| 456 | { |
| 457 | struct sock *sk = gs->sock->sk; |
| 458 | sa_family_t sa_family = sk->sk_family; |
| 459 | |
| 460 | if (sa_family == AF_INET) |
| 461 | udp_del_offload(&gs->udp_offloads); |
| 462 | } |
| 463 | |
| 464 | static void geneve_sock_release(struct geneve_sock *gs) |
| 465 | { |
| 466 | if (--gs->refcnt) |
| 467 | return; |
| 468 | |
| 469 | list_del(&gs->list); |
| 470 | geneve_notify_del_rx_port(gs); |
| 471 | udp_tunnel_sock_release(gs->sock); |
| 472 | kfree_rcu(gs, rcu); |
| 473 | } |
| 474 | |
| 475 | static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, |
| 476 | __be16 dst_port) |
| 477 | { |
| 478 | struct geneve_sock *gs; |
| 479 | |
| 480 | list_for_each_entry(gs, &gn->sock_list, list) { |
| 481 | if (inet_sk(gs->sock->sk)->inet_sport == dst_port && |
| 482 | inet_sk(gs->sock->sk)->sk.sk_family == AF_INET) { |
| 483 | return gs; |
| 484 | } |
| 485 | } |
| 486 | return NULL; |
| 487 | } |
| 488 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 489 | static int geneve_open(struct net_device *dev) |
| 490 | { |
| 491 | struct geneve_dev *geneve = netdev_priv(dev); |
| 492 | struct net *net = geneve->net; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 493 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 494 | struct geneve_sock *gs; |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 495 | __u32 hash; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 496 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 497 | gs = geneve_find_sock(gn, geneve->dst_port); |
| 498 | if (gs) { |
| 499 | gs->refcnt++; |
| 500 | goto out; |
| 501 | } |
| 502 | |
| 503 | gs = geneve_socket_create(net, geneve->dst_port, false); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 504 | if (IS_ERR(gs)) |
| 505 | return PTR_ERR(gs); |
| 506 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 507 | out: |
| 508 | gs->collect_md = geneve->collect_md; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 509 | geneve->sock = gs; |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 510 | |
| 511 | hash = geneve_net_vni_hash(geneve->vni); |
| 512 | hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | static int geneve_stop(struct net_device *dev) |
| 517 | { |
| 518 | struct geneve_dev *geneve = netdev_priv(dev); |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 519 | struct geneve_sock *gs = geneve->sock; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 520 | |
Pravin B Shelar | 66d4700 | 2015-08-26 23:46:55 -0700 | [diff] [blame] | 521 | if (!hlist_unhashed(&geneve->hlist)) |
| 522 | hlist_del_rcu(&geneve->hlist); |
| 523 | geneve_sock_release(gs); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 524 | return 0; |
| 525 | } |
| 526 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 527 | static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, |
| 528 | __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, |
| 529 | bool csum) |
| 530 | { |
| 531 | struct genevehdr *gnvh; |
| 532 | int min_headroom; |
| 533 | int err; |
| 534 | |
| 535 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len |
| 536 | + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); |
| 537 | err = skb_cow_head(skb, min_headroom); |
| 538 | if (unlikely(err)) { |
| 539 | kfree_skb(skb); |
| 540 | goto free_rt; |
| 541 | } |
| 542 | |
| 543 | skb = udp_tunnel_handle_offloads(skb, csum); |
| 544 | if (IS_ERR(skb)) { |
| 545 | err = PTR_ERR(skb); |
| 546 | goto free_rt; |
| 547 | } |
| 548 | |
| 549 | gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); |
| 550 | gnvh->ver = GENEVE_VER; |
| 551 | gnvh->opt_len = opt_len / 4; |
| 552 | gnvh->oam = !!(tun_flags & TUNNEL_OAM); |
| 553 | gnvh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); |
| 554 | gnvh->rsvd1 = 0; |
| 555 | memcpy(gnvh->vni, vni, 3); |
| 556 | gnvh->proto_type = htons(ETH_P_TEB); |
| 557 | gnvh->rsvd2 = 0; |
| 558 | memcpy(gnvh->options, opt, opt_len); |
| 559 | |
| 560 | skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| 561 | return 0; |
| 562 | |
| 563 | free_rt: |
| 564 | ip_rt_put(rt); |
| 565 | return err; |
| 566 | } |
| 567 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 568 | static struct rtable *geneve_get_rt(struct sk_buff *skb, |
| 569 | struct net_device *dev, |
| 570 | struct flowi4 *fl4, |
| 571 | struct ip_tunnel_info *info) |
| 572 | { |
| 573 | struct geneve_dev *geneve = netdev_priv(dev); |
| 574 | struct rtable *rt = NULL; |
| 575 | __u8 tos; |
| 576 | |
| 577 | memset(fl4, 0, sizeof(*fl4)); |
| 578 | fl4->flowi4_mark = skb->mark; |
| 579 | fl4->flowi4_proto = IPPROTO_UDP; |
| 580 | |
| 581 | if (info) { |
| 582 | fl4->daddr = info->key.u.ipv4.dst; |
| 583 | fl4->saddr = info->key.u.ipv4.src; |
| 584 | fl4->flowi4_tos = RT_TOS(info->key.tos); |
| 585 | } else { |
| 586 | tos = geneve->tos; |
| 587 | if (tos == 1) { |
| 588 | const struct iphdr *iip = ip_hdr(skb); |
| 589 | |
| 590 | tos = ip_tunnel_get_dsfield(iip, skb); |
| 591 | } |
| 592 | |
| 593 | fl4->flowi4_tos = RT_TOS(tos); |
| 594 | fl4->daddr = geneve->remote.sin_addr.s_addr; |
| 595 | } |
| 596 | |
| 597 | rt = ip_route_output_key(geneve->net, fl4); |
| 598 | if (IS_ERR(rt)) { |
| 599 | netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); |
| 600 | dev->stats.tx_carrier_errors++; |
| 601 | return rt; |
| 602 | } |
| 603 | if (rt->dst.dev == dev) { /* is this necessary? */ |
| 604 | netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); |
| 605 | dev->stats.collisions++; |
| 606 | ip_rt_put(rt); |
| 607 | return ERR_PTR(-EINVAL); |
| 608 | } |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 609 | return rt; |
| 610 | } |
| 611 | |
| 612 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ |
| 613 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) |
| 614 | { |
| 615 | #ifdef __BIG_ENDIAN |
| 616 | vni[0] = (__force __u8)(tun_id >> 16); |
| 617 | vni[1] = (__force __u8)(tun_id >> 8); |
| 618 | vni[2] = (__force __u8)tun_id; |
| 619 | #else |
| 620 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); |
| 621 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); |
| 622 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); |
| 623 | #endif |
| 624 | } |
| 625 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 626 | static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) |
| 627 | { |
| 628 | struct geneve_dev *geneve = netdev_priv(dev); |
| 629 | struct geneve_sock *gs = geneve->sock; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 630 | struct ip_tunnel_info *info = NULL; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 631 | struct rtable *rt = NULL; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 632 | struct flowi4 fl4; |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 633 | __u8 tos, ttl; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 634 | __be16 sport; |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 635 | bool udp_csum; |
| 636 | __be16 df; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 637 | int err; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 638 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 639 | if (geneve->collect_md) { |
| 640 | info = skb_tunnel_info(skb); |
Jiri Benc | 46fa062 | 2015-08-28 20:48:19 +0200 | [diff] [blame] | 641 | if (unlikely(info && !(info->mode & IP_TUNNEL_INFO_TX))) { |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 642 | netdev_dbg(dev, "no tunnel metadata\n"); |
| 643 | goto tx_error; |
| 644 | } |
Jiri Benc | 7f9562a | 2015-08-28 20:48:20 +0200 | [diff] [blame] | 645 | if (info && ip_tunnel_info_af(info) != AF_INET) |
| 646 | goto tx_error; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 647 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 648 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 649 | rt = geneve_get_rt(skb, dev, &fl4, info); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 650 | if (IS_ERR(rt)) { |
| 651 | netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); |
| 652 | dev->stats.tx_carrier_errors++; |
| 653 | goto tx_error; |
| 654 | } |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 655 | |
| 656 | 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] | 657 | skb_reset_mac_header(skb); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 658 | |
| 659 | if (info) { |
| 660 | const struct ip_tunnel_key *key = &info->key; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 661 | u8 *opts = NULL; |
| 662 | u8 vni[3]; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 663 | |
| 664 | tunnel_id_to_vni(key->tun_id, vni); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 665 | if (key->tun_flags & TUNNEL_GENEVE_OPT) |
| 666 | opts = ip_tunnel_info_opts(info, info->options_len); |
| 667 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 668 | udp_csum = !!(key->tun_flags & TUNNEL_CSUM); |
| 669 | err = geneve_build_skb(rt, skb, key->tun_flags, vni, |
| 670 | info->options_len, opts, udp_csum); |
| 671 | if (unlikely(err)) |
| 672 | goto err; |
| 673 | |
| 674 | tos = key->tos; |
| 675 | ttl = key->ttl; |
| 676 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 677 | } else { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 678 | const struct iphdr *iip; /* interior IP header */ |
| 679 | |
| 680 | udp_csum = false; |
| 681 | err = geneve_build_skb(rt, skb, 0, geneve->vni, |
| 682 | 0, NULL, udp_csum); |
| 683 | if (unlikely(err)) |
| 684 | goto err; |
| 685 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 686 | iip = ip_hdr(skb); |
| 687 | tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 688 | ttl = geneve->ttl; |
| 689 | if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) |
| 690 | ttl = 1; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 691 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 692 | df = 0; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 693 | } |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 694 | err = udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, fl4.saddr, fl4.daddr, |
| 695 | tos, ttl, df, sport, geneve->dst_port, |
| 696 | !net_eq(geneve->net, dev_net(geneve->dev)), |
| 697 | !udp_csum); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 698 | |
| 699 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 700 | return NETDEV_TX_OK; |
| 701 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 702 | tx_error: |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 703 | dev_kfree_skb(skb); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 704 | err: |
| 705 | dev->stats.tx_errors++; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 706 | return NETDEV_TX_OK; |
| 707 | } |
| 708 | |
| 709 | static const struct net_device_ops geneve_netdev_ops = { |
| 710 | .ndo_init = geneve_init, |
| 711 | .ndo_uninit = geneve_uninit, |
| 712 | .ndo_open = geneve_open, |
| 713 | .ndo_stop = geneve_stop, |
| 714 | .ndo_start_xmit = geneve_xmit, |
| 715 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
| 716 | .ndo_change_mtu = eth_change_mtu, |
| 717 | .ndo_validate_addr = eth_validate_addr, |
| 718 | .ndo_set_mac_address = eth_mac_addr, |
| 719 | }; |
| 720 | |
| 721 | static void geneve_get_drvinfo(struct net_device *dev, |
| 722 | struct ethtool_drvinfo *drvinfo) |
| 723 | { |
| 724 | strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); |
| 725 | strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); |
| 726 | } |
| 727 | |
| 728 | static const struct ethtool_ops geneve_ethtool_ops = { |
| 729 | .get_drvinfo = geneve_get_drvinfo, |
| 730 | .get_link = ethtool_op_get_link, |
| 731 | }; |
| 732 | |
| 733 | /* Info for udev, that this is a virtual tunnel endpoint */ |
| 734 | static struct device_type geneve_type = { |
| 735 | .name = "geneve", |
| 736 | }; |
| 737 | |
| 738 | /* Initialize the device structure. */ |
| 739 | static void geneve_setup(struct net_device *dev) |
| 740 | { |
| 741 | ether_setup(dev); |
| 742 | |
| 743 | dev->netdev_ops = &geneve_netdev_ops; |
| 744 | dev->ethtool_ops = &geneve_ethtool_ops; |
| 745 | dev->destructor = free_netdev; |
| 746 | |
| 747 | SET_NETDEV_DEVTYPE(dev, &geneve_type); |
| 748 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 749 | dev->features |= NETIF_F_LLTX; |
| 750 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| 751 | dev->features |= NETIF_F_RXCSUM; |
| 752 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 753 | |
| 754 | dev->vlan_features = dev->features; |
| 755 | dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| 756 | |
| 757 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| 758 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| 759 | dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| 760 | |
| 761 | netif_keep_dst(dev); |
Phil Sutter | ed961ac | 2015-08-18 10:30:31 +0200 | [diff] [blame] | 762 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
Pravin B Shelar | 87cd3dc | 2015-08-26 23:46:48 -0700 | [diff] [blame] | 763 | eth_hw_addr_random(dev); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { |
| 767 | [IFLA_GENEVE_ID] = { .type = NLA_U32 }, |
| 768 | [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 769 | [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 770 | [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 771 | [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 772 | [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 773 | }; |
| 774 | |
| 775 | static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 776 | { |
| 777 | if (tb[IFLA_ADDRESS]) { |
| 778 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 779 | return -EINVAL; |
| 780 | |
| 781 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 782 | return -EADDRNOTAVAIL; |
| 783 | } |
| 784 | |
| 785 | if (!data) |
| 786 | return -EINVAL; |
| 787 | |
| 788 | if (data[IFLA_GENEVE_ID]) { |
| 789 | __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 790 | |
| 791 | if (vni >= GENEVE_VID_MASK) |
| 792 | return -ERANGE; |
| 793 | } |
| 794 | |
| 795 | return 0; |
| 796 | } |
| 797 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 798 | static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, |
| 799 | __be16 dst_port, |
| 800 | __be32 rem_addr, |
| 801 | u8 vni[], |
| 802 | bool *tun_on_same_port, |
| 803 | bool *tun_collect_md) |
| 804 | { |
| 805 | struct geneve_dev *geneve, *t; |
| 806 | |
| 807 | *tun_on_same_port = false; |
| 808 | *tun_collect_md = false; |
| 809 | t = NULL; |
| 810 | list_for_each_entry(geneve, &gn->geneve_list, next) { |
| 811 | if (geneve->dst_port == dst_port) { |
| 812 | *tun_collect_md = geneve->collect_md; |
| 813 | *tun_on_same_port = true; |
| 814 | } |
| 815 | if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
| 816 | rem_addr == geneve->remote.sin_addr.s_addr && |
| 817 | dst_port == geneve->dst_port) |
| 818 | t = geneve; |
| 819 | } |
| 820 | return t; |
| 821 | } |
| 822 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 823 | static int geneve_configure(struct net *net, struct net_device *dev, |
| 824 | __be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos, |
| 825 | __u16 dst_port, bool metadata) |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 826 | { |
| 827 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 828 | struct geneve_dev *t, *geneve = netdev_priv(dev); |
| 829 | bool tun_collect_md, tun_on_same_port; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 830 | int err; |
| 831 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 832 | if (metadata) { |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 833 | if (rem_addr || vni || tos || ttl) |
| 834 | return -EINVAL; |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 835 | } |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 836 | |
| 837 | geneve->net = net; |
| 838 | geneve->dev = dev; |
| 839 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 840 | geneve->vni[0] = (vni & 0x00ff0000) >> 16; |
| 841 | geneve->vni[1] = (vni & 0x0000ff00) >> 8; |
| 842 | geneve->vni[2] = vni & 0x000000ff; |
| 843 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 844 | geneve->remote.sin_addr.s_addr = rem_addr; |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 845 | if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr))) |
| 846 | return -EINVAL; |
| 847 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 848 | geneve->ttl = ttl; |
| 849 | geneve->tos = tos; |
| 850 | geneve->dst_port = htons(dst_port); |
| 851 | geneve->collect_md = metadata; |
| 852 | |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 853 | t = geneve_find_dev(gn, htons(dst_port), rem_addr, geneve->vni, |
| 854 | &tun_on_same_port, &tun_collect_md); |
| 855 | if (t) |
| 856 | return -EBUSY; |
| 857 | |
| 858 | if (metadata) { |
| 859 | if (tun_on_same_port) |
| 860 | return -EPERM; |
| 861 | } else { |
| 862 | if (tun_collect_md) |
| 863 | return -EPERM; |
| 864 | } |
| 865 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 866 | err = register_netdevice(dev); |
| 867 | if (err) |
| 868 | return err; |
| 869 | |
| 870 | list_add(&geneve->next, &gn->geneve_list); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 871 | return 0; |
| 872 | } |
| 873 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 874 | static int geneve_newlink(struct net *net, struct net_device *dev, |
| 875 | struct nlattr *tb[], struct nlattr *data[]) |
| 876 | { |
| 877 | __u16 dst_port = GENEVE_UDP_PORT; |
| 878 | __u8 ttl = 0, tos = 0; |
| 879 | bool metadata = false; |
| 880 | __be32 rem_addr; |
| 881 | __u32 vni; |
| 882 | |
| 883 | if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE]) |
| 884 | return -EINVAL; |
| 885 | |
| 886 | vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 887 | rem_addr = nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); |
| 888 | |
| 889 | if (data[IFLA_GENEVE_TTL]) |
| 890 | ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
| 891 | |
| 892 | if (data[IFLA_GENEVE_TOS]) |
| 893 | tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
| 894 | |
| 895 | if (data[IFLA_GENEVE_PORT]) |
| 896 | dst_port = nla_get_u16(data[IFLA_GENEVE_PORT]); |
| 897 | |
| 898 | if (data[IFLA_GENEVE_COLLECT_METADATA]) |
| 899 | metadata = true; |
| 900 | |
| 901 | return geneve_configure(net, dev, rem_addr, vni, |
| 902 | ttl, tos, dst_port, metadata); |
| 903 | } |
| 904 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 905 | static void geneve_dellink(struct net_device *dev, struct list_head *head) |
| 906 | { |
| 907 | struct geneve_dev *geneve = netdev_priv(dev); |
| 908 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 909 | list_del(&geneve->next); |
| 910 | unregister_netdevice_queue(dev, head); |
| 911 | } |
| 912 | |
| 913 | static size_t geneve_get_size(const struct net_device *dev) |
| 914 | { |
| 915 | return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ |
| 916 | nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */ |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 917 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 918 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 919 | nla_total_size(sizeof(__u16)) + /* IFLA_GENEVE_PORT */ |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 920 | nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 921 | 0; |
| 922 | } |
| 923 | |
| 924 | static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 925 | { |
| 926 | struct geneve_dev *geneve = netdev_priv(dev); |
| 927 | __u32 vni; |
| 928 | |
| 929 | vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; |
| 930 | if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) |
| 931 | goto nla_put_failure; |
| 932 | |
| 933 | if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, |
| 934 | geneve->remote.sin_addr.s_addr)) |
| 935 | goto nla_put_failure; |
| 936 | |
John W. Linville | d895112 | 2015-06-01 15:51:35 -0400 | [diff] [blame] | 937 | if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || |
| 938 | nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos)) |
John W. Linville | 8760ce5 | 2015-06-01 15:51:34 -0400 | [diff] [blame] | 939 | goto nla_put_failure; |
| 940 | |
Pravin B Shelar | cd7918b | 2015-08-26 23:46:51 -0700 | [diff] [blame] | 941 | if (nla_put_u16(skb, IFLA_GENEVE_PORT, ntohs(geneve->dst_port))) |
| 942 | goto nla_put_failure; |
| 943 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 944 | if (geneve->collect_md) { |
| 945 | if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) |
| 946 | goto nla_put_failure; |
| 947 | } |
| 948 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 949 | return 0; |
| 950 | |
| 951 | nla_put_failure: |
| 952 | return -EMSGSIZE; |
| 953 | } |
| 954 | |
| 955 | static struct rtnl_link_ops geneve_link_ops __read_mostly = { |
| 956 | .kind = "geneve", |
| 957 | .maxtype = IFLA_GENEVE_MAX, |
| 958 | .policy = geneve_policy, |
| 959 | .priv_size = sizeof(struct geneve_dev), |
| 960 | .setup = geneve_setup, |
| 961 | .validate = geneve_validate, |
| 962 | .newlink = geneve_newlink, |
| 963 | .dellink = geneve_dellink, |
| 964 | .get_size = geneve_get_size, |
| 965 | .fill_info = geneve_fill_info, |
| 966 | }; |
| 967 | |
Pravin B Shelar | e305ac6 | 2015-08-26 23:46:52 -0700 | [diff] [blame] | 968 | struct net_device *geneve_dev_create_fb(struct net *net, const char *name, |
| 969 | u8 name_assign_type, u16 dst_port) |
| 970 | { |
| 971 | struct nlattr *tb[IFLA_MAX + 1]; |
| 972 | struct net_device *dev; |
| 973 | int err; |
| 974 | |
| 975 | memset(tb, 0, sizeof(tb)); |
| 976 | dev = rtnl_create_link(net, name, name_assign_type, |
| 977 | &geneve_link_ops, tb); |
| 978 | if (IS_ERR(dev)) |
| 979 | return dev; |
| 980 | |
| 981 | err = geneve_configure(net, dev, 0, 0, 0, 0, dst_port, true); |
| 982 | if (err) { |
| 983 | free_netdev(dev); |
| 984 | return ERR_PTR(err); |
| 985 | } |
| 986 | return dev; |
| 987 | } |
| 988 | EXPORT_SYMBOL_GPL(geneve_dev_create_fb); |
| 989 | |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 990 | static __net_init int geneve_init_net(struct net *net) |
| 991 | { |
| 992 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 993 | |
| 994 | INIT_LIST_HEAD(&gn->geneve_list); |
Pravin B Shelar | 371bd10 | 2015-08-26 23:46:54 -0700 | [diff] [blame] | 995 | INIT_LIST_HEAD(&gn->sock_list); |
John W. Linville | 2d07dc7 | 2015-05-13 12:57:30 -0400 | [diff] [blame] | 996 | return 0; |
| 997 | } |
| 998 | |
| 999 | static void __net_exit geneve_exit_net(struct net *net) |
| 1000 | { |
| 1001 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 1002 | struct geneve_dev *geneve, *next; |
| 1003 | struct net_device *dev, *aux; |
| 1004 | LIST_HEAD(list); |
| 1005 | |
| 1006 | rtnl_lock(); |
| 1007 | |
| 1008 | /* gather any geneve devices that were moved into this ns */ |
| 1009 | for_each_netdev_safe(net, dev, aux) |
| 1010 | if (dev->rtnl_link_ops == &geneve_link_ops) |
| 1011 | unregister_netdevice_queue(dev, &list); |
| 1012 | |
| 1013 | /* now gather any other geneve devices that were created in this ns */ |
| 1014 | list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { |
| 1015 | /* If geneve->dev is in the same netns, it was already added |
| 1016 | * to the list by the previous loop. |
| 1017 | */ |
| 1018 | if (!net_eq(dev_net(geneve->dev), net)) |
| 1019 | unregister_netdevice_queue(geneve->dev, &list); |
| 1020 | } |
| 1021 | |
| 1022 | /* unregister the devices gathered above */ |
| 1023 | unregister_netdevice_many(&list); |
| 1024 | rtnl_unlock(); |
| 1025 | } |
| 1026 | |
| 1027 | static struct pernet_operations geneve_net_ops = { |
| 1028 | .init = geneve_init_net, |
| 1029 | .exit = geneve_exit_net, |
| 1030 | .id = &geneve_net_id, |
| 1031 | .size = sizeof(struct geneve_net), |
| 1032 | }; |
| 1033 | |
| 1034 | static int __init geneve_init_module(void) |
| 1035 | { |
| 1036 | int rc; |
| 1037 | |
| 1038 | rc = register_pernet_subsys(&geneve_net_ops); |
| 1039 | if (rc) |
| 1040 | goto out1; |
| 1041 | |
| 1042 | rc = rtnl_link_register(&geneve_link_ops); |
| 1043 | if (rc) |
| 1044 | goto out2; |
| 1045 | |
| 1046 | return 0; |
| 1047 | out2: |
| 1048 | unregister_pernet_subsys(&geneve_net_ops); |
| 1049 | out1: |
| 1050 | return rc; |
| 1051 | } |
| 1052 | late_initcall(geneve_init_module); |
| 1053 | |
| 1054 | static void __exit geneve_cleanup_module(void) |
| 1055 | { |
| 1056 | rtnl_link_unregister(&geneve_link_ops); |
| 1057 | unregister_pernet_subsys(&geneve_net_ops); |
| 1058 | } |
| 1059 | module_exit(geneve_cleanup_module); |
| 1060 | |
| 1061 | MODULE_LICENSE("GPL"); |
| 1062 | MODULE_VERSION(GENEVE_NETDEV_VER); |
| 1063 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); |
| 1064 | MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); |
| 1065 | MODULE_ALIAS_RTNL_LINK("geneve"); |