| 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/etherdevice.h> |
| 16 | #include <linux/hash.h> |
| 17 | #include <net/dst_metadata.h> |
| 18 | #include <net/gro_cells.h> |
| 19 | #include <net/rtnetlink.h> |
| 20 | #include <net/geneve.h> |
| 21 | #include <net/protocol.h> |
| 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 | |
| 37 | #define GENEVE_VER 0 |
| 38 | #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) |
| 39 | |
| 40 | /* per-network namespace private data for this module */ |
| 41 | struct geneve_net { |
| 42 | struct list_head geneve_list; |
| 43 | struct list_head sock_list; |
| 44 | }; |
| 45 | |
| 46 | static unsigned int geneve_net_id; |
| 47 | |
| 48 | struct geneve_dev_node { |
| 49 | struct hlist_node hlist; |
| 50 | struct geneve_dev *geneve; |
| 51 | }; |
| 52 | |
| 53 | /* Pseudo network device */ |
| 54 | struct geneve_dev { |
| 55 | struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ |
| 56 | #if IS_ENABLED(CONFIG_IPV6) |
| 57 | struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ |
| 58 | #endif |
| 59 | struct net *net; /* netns for packet i/o */ |
| 60 | struct net_device *dev; /* netdev for geneve tunnel */ |
| 61 | struct ip_tunnel_info info; |
| 62 | struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ |
| 63 | #if IS_ENABLED(CONFIG_IPV6) |
| 64 | struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ |
| 65 | #endif |
| 66 | struct list_head next; /* geneve's per namespace list */ |
| 67 | struct gro_cells gro_cells; |
| 68 | bool collect_md; |
| 69 | bool use_udp6_rx_checksums; |
| 70 | }; |
| 71 | |
| 72 | struct geneve_sock { |
| 73 | bool collect_md; |
| 74 | struct list_head list; |
| 75 | struct socket *sock; |
| 76 | struct rcu_head rcu; |
| 77 | int refcnt; |
| 78 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
| 79 | }; |
| 80 | |
| 81 | static inline __u32 geneve_net_vni_hash(u8 vni[3]) |
| 82 | { |
| 83 | __u32 vnid; |
| 84 | |
| 85 | vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 86 | return hash_32(vnid, VNI_HASH_BITS); |
| 87 | } |
| 88 | |
| 89 | static __be64 vni_to_tunnel_id(const __u8 *vni) |
| 90 | { |
| 91 | #ifdef __BIG_ENDIAN |
| 92 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; |
| 93 | #else |
| 94 | return (__force __be64)(((__force u64)vni[0] << 40) | |
| 95 | ((__force u64)vni[1] << 48) | |
| 96 | ((__force u64)vni[2] << 56)); |
| 97 | #endif |
| 98 | } |
| 99 | |
| 100 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ |
| 101 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) |
| 102 | { |
| 103 | #ifdef __BIG_ENDIAN |
| 104 | vni[0] = (__force __u8)(tun_id >> 16); |
| 105 | vni[1] = (__force __u8)(tun_id >> 8); |
| 106 | vni[2] = (__force __u8)tun_id; |
| 107 | #else |
| 108 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); |
| 109 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); |
| 110 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); |
| 111 | #endif |
| 112 | } |
| 113 | |
| 114 | static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) |
| 115 | { |
| 116 | return !memcmp(vni, &tun_id[5], 3); |
| 117 | } |
| 118 | |
| 119 | static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) |
| 120 | { |
| 121 | return gs->sock->sk->sk_family; |
| 122 | } |
| 123 | |
| 124 | static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, |
| 125 | __be32 addr, u8 vni[]) |
| 126 | { |
| 127 | struct hlist_head *vni_list_head; |
| 128 | struct geneve_dev_node *node; |
| 129 | __u32 hash; |
| 130 | |
| 131 | /* Find the device for this VNI */ |
| 132 | hash = geneve_net_vni_hash(vni); |
| 133 | vni_list_head = &gs->vni_list[hash]; |
| 134 | hlist_for_each_entry_rcu(node, vni_list_head, hlist) { |
| 135 | if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) && |
| 136 | addr == node->geneve->info.key.u.ipv4.dst) |
| 137 | return node->geneve; |
| 138 | } |
| 139 | return NULL; |
| 140 | } |
| 141 | |
| 142 | #if IS_ENABLED(CONFIG_IPV6) |
| 143 | static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, |
| 144 | struct in6_addr addr6, u8 vni[]) |
| 145 | { |
| 146 | struct hlist_head *vni_list_head; |
| 147 | struct geneve_dev_node *node; |
| 148 | __u32 hash; |
| 149 | |
| 150 | /* Find the device for this VNI */ |
| 151 | hash = geneve_net_vni_hash(vni); |
| 152 | vni_list_head = &gs->vni_list[hash]; |
| 153 | hlist_for_each_entry_rcu(node, vni_list_head, hlist) { |
| 154 | if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) && |
| 155 | ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst)) |
| 156 | return node->geneve; |
| 157 | } |
| 158 | return NULL; |
| 159 | } |
| 160 | #endif |
| 161 | |
| 162 | static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) |
| 163 | { |
| 164 | return (struct genevehdr *)(udp_hdr(skb) + 1); |
| 165 | } |
| 166 | |
| 167 | static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, |
| 168 | struct sk_buff *skb) |
| 169 | { |
| 170 | static u8 zero_vni[3]; |
| 171 | u8 *vni; |
| 172 | |
| 173 | if (geneve_get_sk_family(gs) == AF_INET) { |
| 174 | struct iphdr *iph; |
| 175 | __be32 addr; |
| 176 | |
| 177 | iph = ip_hdr(skb); /* outer IP header... */ |
| 178 | |
| 179 | if (gs->collect_md) { |
| 180 | vni = zero_vni; |
| 181 | addr = 0; |
| 182 | } else { |
| 183 | vni = geneve_hdr(skb)->vni; |
| 184 | addr = iph->saddr; |
| 185 | } |
| 186 | |
| 187 | return geneve_lookup(gs, addr, vni); |
| 188 | #if IS_ENABLED(CONFIG_IPV6) |
| 189 | } else if (geneve_get_sk_family(gs) == AF_INET6) { |
| 190 | static struct in6_addr zero_addr6; |
| 191 | struct ipv6hdr *ip6h; |
| 192 | struct in6_addr addr6; |
| 193 | |
| 194 | ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ |
| 195 | |
| 196 | if (gs->collect_md) { |
| 197 | vni = zero_vni; |
| 198 | addr6 = zero_addr6; |
| 199 | } else { |
| 200 | vni = geneve_hdr(skb)->vni; |
| 201 | addr6 = ip6h->saddr; |
| 202 | } |
| 203 | |
| 204 | return geneve6_lookup(gs, addr6, vni); |
| 205 | #endif |
| 206 | } |
| 207 | return NULL; |
| 208 | } |
| 209 | |
| 210 | /* geneve receive/decap routine */ |
| 211 | static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, |
| 212 | struct sk_buff *skb) |
| 213 | { |
| 214 | struct genevehdr *gnvh = geneve_hdr(skb); |
| 215 | struct metadata_dst *tun_dst = NULL; |
| 216 | struct pcpu_sw_netstats *stats; |
| 217 | unsigned int len; |
| 218 | int err = 0; |
| 219 | void *oiph; |
| 220 | |
| 221 | if (ip_tunnel_collect_metadata() || gs->collect_md) { |
| 222 | __be16 flags; |
| 223 | |
| 224 | flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | |
| 225 | (gnvh->oam ? TUNNEL_OAM : 0) | |
| 226 | (gnvh->critical ? TUNNEL_CRIT_OPT : 0); |
| 227 | |
| 228 | tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, |
| 229 | vni_to_tunnel_id(gnvh->vni), |
| 230 | gnvh->opt_len * 4); |
| 231 | if (!tun_dst) { |
| 232 | geneve->dev->stats.rx_dropped++; |
| 233 | goto drop; |
| 234 | } |
| 235 | /* Update tunnel dst according to Geneve options. */ |
| 236 | ip_tunnel_info_opts_set(&tun_dst->u.tun_info, |
| 237 | gnvh->options, gnvh->opt_len * 4); |
| 238 | } else { |
| 239 | /* Drop packets w/ critical options, |
| 240 | * since we don't support any... |
| 241 | */ |
| 242 | if (gnvh->critical) { |
| 243 | geneve->dev->stats.rx_frame_errors++; |
| 244 | geneve->dev->stats.rx_errors++; |
| 245 | goto drop; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | skb_reset_mac_header(skb); |
| 250 | skb->protocol = eth_type_trans(skb, geneve->dev); |
| 251 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 252 | |
| 253 | if (tun_dst) |
| 254 | skb_dst_set(skb, &tun_dst->dst); |
| 255 | |
| 256 | /* Ignore packet loops (and multicast echo) */ |
| 257 | if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { |
| 258 | geneve->dev->stats.rx_errors++; |
| 259 | goto drop; |
| 260 | } |
| 261 | |
| 262 | oiph = skb_network_header(skb); |
| 263 | skb_reset_network_header(skb); |
| 264 | |
| 265 | if (geneve_get_sk_family(gs) == AF_INET) |
| 266 | err = IP_ECN_decapsulate(oiph, skb); |
| 267 | #if IS_ENABLED(CONFIG_IPV6) |
| 268 | else |
| 269 | err = IP6_ECN_decapsulate(oiph, skb); |
| 270 | #endif |
| 271 | |
| 272 | if (unlikely(err)) { |
| 273 | if (log_ecn_error) { |
| 274 | if (geneve_get_sk_family(gs) == AF_INET) |
| 275 | net_info_ratelimited("non-ECT from %pI4 " |
| 276 | "with TOS=%#x\n", |
| 277 | &((struct iphdr *)oiph)->saddr, |
| 278 | ((struct iphdr *)oiph)->tos); |
| 279 | #if IS_ENABLED(CONFIG_IPV6) |
| 280 | else |
| 281 | net_info_ratelimited("non-ECT from %pI6\n", |
| 282 | &((struct ipv6hdr *)oiph)->saddr); |
| 283 | #endif |
| 284 | } |
| 285 | if (err > 1) { |
| 286 | ++geneve->dev->stats.rx_frame_errors; |
| 287 | ++geneve->dev->stats.rx_errors; |
| 288 | goto drop; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | len = skb->len; |
| 293 | err = gro_cells_receive(&geneve->gro_cells, skb); |
| 294 | if (likely(err == NET_RX_SUCCESS)) { |
| 295 | stats = this_cpu_ptr(geneve->dev->tstats); |
| 296 | u64_stats_update_begin(&stats->syncp); |
| 297 | stats->rx_packets++; |
| 298 | stats->rx_bytes += len; |
| 299 | u64_stats_update_end(&stats->syncp); |
| 300 | } |
| 301 | return; |
| 302 | drop: |
| 303 | /* Consume bad packet */ |
| 304 | kfree_skb(skb); |
| 305 | } |
| 306 | |
| 307 | /* Setup stats when device is created */ |
| 308 | static int geneve_init(struct net_device *dev) |
| 309 | { |
| 310 | struct geneve_dev *geneve = netdev_priv(dev); |
| 311 | int err; |
| 312 | |
| 313 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 314 | if (!dev->tstats) |
| 315 | return -ENOMEM; |
| 316 | |
| 317 | err = gro_cells_init(&geneve->gro_cells, dev); |
| 318 | if (err) { |
| 319 | free_percpu(dev->tstats); |
| 320 | return err; |
| 321 | } |
| 322 | |
| 323 | err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL); |
| 324 | if (err) { |
| 325 | free_percpu(dev->tstats); |
| 326 | gro_cells_destroy(&geneve->gro_cells); |
| 327 | return err; |
| 328 | } |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static void geneve_uninit(struct net_device *dev) |
| 333 | { |
| 334 | struct geneve_dev *geneve = netdev_priv(dev); |
| 335 | |
| 336 | dst_cache_destroy(&geneve->info.dst_cache); |
| 337 | gro_cells_destroy(&geneve->gro_cells); |
| 338 | free_percpu(dev->tstats); |
| 339 | } |
| 340 | |
| 341 | /* Callback from net/ipv4/udp.c to receive packets */ |
| 342 | static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) |
| 343 | { |
| 344 | struct genevehdr *geneveh; |
| 345 | struct geneve_dev *geneve; |
| 346 | struct geneve_sock *gs; |
| 347 | int opts_len; |
| 348 | |
| 349 | /* Need UDP and Geneve header to be present */ |
| 350 | if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) |
| 351 | goto drop; |
| 352 | |
| 353 | /* Return packets with reserved bits set */ |
| 354 | geneveh = geneve_hdr(skb); |
| 355 | if (unlikely(geneveh->ver != GENEVE_VER)) |
| 356 | goto drop; |
| 357 | |
| 358 | if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) |
| 359 | goto drop; |
| 360 | |
| 361 | gs = rcu_dereference_sk_user_data(sk); |
| 362 | if (!gs) |
| 363 | goto drop; |
| 364 | |
| 365 | geneve = geneve_lookup_skb(gs, skb); |
| 366 | if (!geneve) |
| 367 | goto drop; |
| 368 | |
| 369 | opts_len = geneveh->opt_len * 4; |
| 370 | if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, |
| 371 | htons(ETH_P_TEB), |
| 372 | !net_eq(geneve->net, dev_net(geneve->dev)))) { |
| 373 | geneve->dev->stats.rx_dropped++; |
| 374 | goto drop; |
| 375 | } |
| 376 | |
| 377 | geneve_rx(geneve, gs, skb); |
| 378 | return 0; |
| 379 | |
| 380 | drop: |
| 381 | /* Consume bad packet */ |
| 382 | kfree_skb(skb); |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static struct socket *geneve_create_sock(struct net *net, bool ipv6, |
| 387 | __be16 port, bool ipv6_rx_csum) |
| 388 | { |
| 389 | struct socket *sock; |
| 390 | struct udp_port_cfg udp_conf; |
| 391 | int err; |
| 392 | |
| 393 | memset(&udp_conf, 0, sizeof(udp_conf)); |
| 394 | |
| 395 | if (ipv6) { |
| 396 | udp_conf.family = AF_INET6; |
| 397 | udp_conf.ipv6_v6only = 1; |
| 398 | udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; |
| 399 | } else { |
| 400 | udp_conf.family = AF_INET; |
| 401 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); |
| 402 | } |
| 403 | |
| 404 | udp_conf.local_udp_port = port; |
| 405 | |
| 406 | /* Open UDP socket */ |
| 407 | err = udp_sock_create(net, &udp_conf, &sock); |
| 408 | if (err < 0) |
| 409 | return ERR_PTR(err); |
| 410 | |
| 411 | return sock; |
| 412 | } |
| 413 | |
| 414 | static int geneve_hlen(struct genevehdr *gh) |
| 415 | { |
| 416 | return sizeof(*gh) + gh->opt_len * 4; |
| 417 | } |
| 418 | |
| 419 | static struct sk_buff **geneve_gro_receive(struct sock *sk, |
| 420 | struct sk_buff **head, |
| 421 | struct sk_buff *skb) |
| 422 | { |
| 423 | struct sk_buff *p, **pp = NULL; |
| 424 | struct genevehdr *gh, *gh2; |
| 425 | unsigned int hlen, gh_len, off_gnv; |
| 426 | const struct packet_offload *ptype; |
| 427 | __be16 type; |
| 428 | int flush = 1; |
| 429 | |
| 430 | off_gnv = skb_gro_offset(skb); |
| 431 | hlen = off_gnv + sizeof(*gh); |
| 432 | gh = skb_gro_header_fast(skb, off_gnv); |
| 433 | if (skb_gro_header_hard(skb, hlen)) { |
| 434 | gh = skb_gro_header_slow(skb, hlen, off_gnv); |
| 435 | if (unlikely(!gh)) |
| 436 | goto out; |
| 437 | } |
| 438 | |
| 439 | if (gh->ver != GENEVE_VER || gh->oam) |
| 440 | goto out; |
| 441 | gh_len = geneve_hlen(gh); |
| 442 | |
| 443 | hlen = off_gnv + gh_len; |
| 444 | if (skb_gro_header_hard(skb, hlen)) { |
| 445 | gh = skb_gro_header_slow(skb, hlen, off_gnv); |
| 446 | if (unlikely(!gh)) |
| 447 | goto out; |
| 448 | } |
| 449 | |
| 450 | for (p = *head; p; p = p->next) { |
| 451 | if (!NAPI_GRO_CB(p)->same_flow) |
| 452 | continue; |
| 453 | |
| 454 | gh2 = (struct genevehdr *)(p->data + off_gnv); |
| 455 | if (gh->opt_len != gh2->opt_len || |
| 456 | memcmp(gh, gh2, gh_len)) { |
| 457 | NAPI_GRO_CB(p)->same_flow = 0; |
| 458 | continue; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | type = gh->proto_type; |
| 463 | |
| 464 | rcu_read_lock(); |
| 465 | ptype = gro_find_receive_by_type(type); |
| 466 | if (!ptype) |
| 467 | goto out_unlock; |
| 468 | |
| 469 | skb_gro_pull(skb, gh_len); |
| 470 | skb_gro_postpull_rcsum(skb, gh, gh_len); |
| 471 | pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); |
| 472 | flush = 0; |
| 473 | |
| 474 | out_unlock: |
| 475 | rcu_read_unlock(); |
| 476 | out: |
| 477 | NAPI_GRO_CB(skb)->flush |= flush; |
| 478 | |
| 479 | return pp; |
| 480 | } |
| 481 | |
| 482 | static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, |
| 483 | int nhoff) |
| 484 | { |
| 485 | struct genevehdr *gh; |
| 486 | struct packet_offload *ptype; |
| 487 | __be16 type; |
| 488 | int gh_len; |
| 489 | int err = -ENOSYS; |
| 490 | |
| 491 | gh = (struct genevehdr *)(skb->data + nhoff); |
| 492 | gh_len = geneve_hlen(gh); |
| 493 | type = gh->proto_type; |
| 494 | |
| 495 | rcu_read_lock(); |
| 496 | ptype = gro_find_complete_by_type(type); |
| 497 | if (ptype) |
| 498 | err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); |
| 499 | |
| 500 | rcu_read_unlock(); |
| 501 | |
| 502 | skb_set_inner_mac_header(skb, nhoff + gh_len); |
| 503 | |
| 504 | return err; |
| 505 | } |
| 506 | |
| 507 | /* Create new listen socket if needed */ |
| 508 | static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, |
| 509 | bool ipv6, bool ipv6_rx_csum) |
| 510 | { |
| 511 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 512 | struct geneve_sock *gs; |
| 513 | struct socket *sock; |
| 514 | struct udp_tunnel_sock_cfg tunnel_cfg; |
| 515 | int h; |
| 516 | |
| 517 | gs = kzalloc(sizeof(*gs), GFP_KERNEL); |
| 518 | if (!gs) |
| 519 | return ERR_PTR(-ENOMEM); |
| 520 | |
| 521 | sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); |
| 522 | if (IS_ERR(sock)) { |
| 523 | kfree(gs); |
| 524 | return ERR_CAST(sock); |
| 525 | } |
| 526 | |
| 527 | gs->sock = sock; |
| 528 | gs->refcnt = 1; |
| 529 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
| 530 | INIT_HLIST_HEAD(&gs->vni_list[h]); |
| 531 | |
| 532 | /* Initialize the geneve udp offloads structure */ |
| 533 | udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); |
| 534 | |
| 535 | /* Mark socket as an encapsulation socket */ |
| 536 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); |
| 537 | tunnel_cfg.sk_user_data = gs; |
| 538 | tunnel_cfg.encap_type = 1; |
| 539 | tunnel_cfg.gro_receive = geneve_gro_receive; |
| 540 | tunnel_cfg.gro_complete = geneve_gro_complete; |
| 541 | tunnel_cfg.encap_rcv = geneve_udp_encap_recv; |
| 542 | tunnel_cfg.encap_destroy = NULL; |
| 543 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
| 544 | list_add(&gs->list, &gn->sock_list); |
| 545 | return gs; |
| 546 | } |
| 547 | |
| 548 | static void __geneve_sock_release(struct geneve_sock *gs) |
| 549 | { |
| 550 | if (!gs || --gs->refcnt) |
| 551 | return; |
| 552 | |
| 553 | list_del(&gs->list); |
| 554 | udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); |
| 555 | udp_tunnel_sock_release(gs->sock); |
| 556 | kfree_rcu(gs, rcu); |
| 557 | } |
| 558 | |
| 559 | static void geneve_sock_release(struct geneve_dev *geneve) |
| 560 | { |
| 561 | struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); |
| 562 | #if IS_ENABLED(CONFIG_IPV6) |
| 563 | struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); |
| 564 | |
| 565 | rcu_assign_pointer(geneve->sock6, NULL); |
| 566 | #endif |
| 567 | |
| 568 | rcu_assign_pointer(geneve->sock4, NULL); |
| 569 | synchronize_net(); |
| 570 | |
| 571 | __geneve_sock_release(gs4); |
| 572 | #if IS_ENABLED(CONFIG_IPV6) |
| 573 | __geneve_sock_release(gs6); |
| 574 | #endif |
| 575 | } |
| 576 | |
| 577 | static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, |
| 578 | sa_family_t family, |
| 579 | __be16 dst_port) |
| 580 | { |
| 581 | struct geneve_sock *gs; |
| 582 | |
| 583 | list_for_each_entry(gs, &gn->sock_list, list) { |
| 584 | if (inet_sk(gs->sock->sk)->inet_sport == dst_port && |
| 585 | geneve_get_sk_family(gs) == family) { |
| 586 | return gs; |
| 587 | } |
| 588 | } |
| 589 | return NULL; |
| 590 | } |
| 591 | |
| 592 | static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) |
| 593 | { |
| 594 | struct net *net = geneve->net; |
| 595 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 596 | struct geneve_dev_node *node; |
| 597 | struct geneve_sock *gs; |
| 598 | __u8 vni[3]; |
| 599 | __u32 hash; |
| 600 | |
| 601 | gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst); |
| 602 | if (gs) { |
| 603 | gs->refcnt++; |
| 604 | goto out; |
| 605 | } |
| 606 | |
| 607 | gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6, |
| 608 | geneve->use_udp6_rx_checksums); |
| 609 | if (IS_ERR(gs)) |
| 610 | return PTR_ERR(gs); |
| 611 | |
| 612 | out: |
| 613 | gs->collect_md = geneve->collect_md; |
| 614 | #if IS_ENABLED(CONFIG_IPV6) |
| 615 | if (ipv6) { |
| 616 | rcu_assign_pointer(geneve->sock6, gs); |
| 617 | node = &geneve->hlist6; |
| 618 | } else |
| 619 | #endif |
| 620 | { |
| 621 | rcu_assign_pointer(geneve->sock4, gs); |
| 622 | node = &geneve->hlist4; |
| 623 | } |
| 624 | node->geneve = geneve; |
| 625 | |
| 626 | tunnel_id_to_vni(geneve->info.key.tun_id, vni); |
| 627 | hash = geneve_net_vni_hash(vni); |
| 628 | hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | static int geneve_open(struct net_device *dev) |
| 633 | { |
| 634 | struct geneve_dev *geneve = netdev_priv(dev); |
| 635 | bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6); |
| 636 | bool metadata = geneve->collect_md; |
| 637 | int ret = 0; |
| 638 | |
| 639 | #if IS_ENABLED(CONFIG_IPV6) |
| 640 | if (ipv6 || metadata) |
| 641 | ret = geneve_sock_add(geneve, true); |
| 642 | #endif |
| 643 | if (!ret && (!ipv6 || metadata)) |
| 644 | ret = geneve_sock_add(geneve, false); |
| 645 | if (ret < 0) |
| 646 | geneve_sock_release(geneve); |
| 647 | |
| 648 | return ret; |
| 649 | } |
| 650 | |
| 651 | static int geneve_stop(struct net_device *dev) |
| 652 | { |
| 653 | struct geneve_dev *geneve = netdev_priv(dev); |
| 654 | |
| 655 | hlist_del_init_rcu(&geneve->hlist4.hlist); |
| 656 | #if IS_ENABLED(CONFIG_IPV6) |
| 657 | hlist_del_init_rcu(&geneve->hlist6.hlist); |
| 658 | #endif |
| 659 | geneve_sock_release(geneve); |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | static void geneve_build_header(struct genevehdr *geneveh, |
| 664 | const struct ip_tunnel_info *info) |
| 665 | { |
| 666 | geneveh->ver = GENEVE_VER; |
| 667 | geneveh->opt_len = info->options_len / 4; |
| 668 | geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); |
| 669 | geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); |
| 670 | geneveh->rsvd1 = 0; |
| 671 | tunnel_id_to_vni(info->key.tun_id, geneveh->vni); |
| 672 | geneveh->proto_type = htons(ETH_P_TEB); |
| 673 | geneveh->rsvd2 = 0; |
| 674 | |
| 675 | ip_tunnel_info_opts_get(geneveh->options, info); |
| 676 | } |
| 677 | |
| 678 | static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, |
| 679 | const struct ip_tunnel_info *info, |
| 680 | bool xnet, int ip_hdr_len) |
| 681 | { |
| 682 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); |
| 683 | struct genevehdr *gnvh; |
| 684 | int min_headroom; |
| 685 | int err; |
| 686 | |
| 687 | skb_reset_mac_header(skb); |
| 688 | skb_scrub_packet(skb, xnet); |
| 689 | |
| 690 | min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + |
| 691 | GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; |
| 692 | err = skb_cow_head(skb, min_headroom); |
| 693 | if (unlikely(err)) |
| 694 | goto free_dst; |
| 695 | |
| 696 | err = udp_tunnel_handle_offloads(skb, udp_sum); |
| 697 | if (err) |
| 698 | goto free_dst; |
| 699 | |
| 700 | gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); |
| 701 | geneve_build_header(gnvh, info); |
| 702 | skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| 703 | return 0; |
| 704 | |
| 705 | free_dst: |
| 706 | dst_release(dst); |
| 707 | return err; |
| 708 | } |
| 709 | |
| 710 | static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, |
| 711 | struct net_device *dev, |
| 712 | struct geneve_sock *gs4, |
| 713 | struct flowi4 *fl4, |
| 714 | const struct ip_tunnel_info *info) |
| 715 | { |
| 716 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
| 717 | struct geneve_dev *geneve = netdev_priv(dev); |
| 718 | struct dst_cache *dst_cache; |
| 719 | struct rtable *rt = NULL; |
| 720 | __u8 tos; |
| 721 | |
| 722 | if (!gs4) |
| 723 | return ERR_PTR(-EIO); |
| 724 | |
| 725 | memset(fl4, 0, sizeof(*fl4)); |
| 726 | fl4->flowi4_mark = skb->mark; |
| 727 | fl4->flowi4_proto = IPPROTO_UDP; |
| 728 | fl4->daddr = info->key.u.ipv4.dst; |
| 729 | fl4->saddr = info->key.u.ipv4.src; |
| 730 | |
| 731 | tos = info->key.tos; |
| 732 | if ((tos == 1) && !geneve->collect_md) { |
| 733 | tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); |
| 734 | use_cache = false; |
| 735 | } |
| 736 | fl4->flowi4_tos = RT_TOS(tos); |
| 737 | |
| 738 | dst_cache = (struct dst_cache *)&info->dst_cache; |
| 739 | if (use_cache) { |
| 740 | rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); |
| 741 | if (rt) |
| 742 | return rt; |
| 743 | } |
| 744 | rt = ip_route_output_key(geneve->net, fl4); |
| 745 | if (IS_ERR(rt)) { |
| 746 | netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); |
| 747 | return ERR_PTR(-ENETUNREACH); |
| 748 | } |
| 749 | if (rt->dst.dev == dev) { /* is this necessary? */ |
| 750 | netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); |
| 751 | ip_rt_put(rt); |
| 752 | return ERR_PTR(-ELOOP); |
| 753 | } |
| 754 | if (use_cache) |
| 755 | dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); |
| 756 | return rt; |
| 757 | } |
| 758 | |
| 759 | #if IS_ENABLED(CONFIG_IPV6) |
| 760 | static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, |
| 761 | struct net_device *dev, |
| 762 | struct geneve_sock *gs6, |
| 763 | struct flowi6 *fl6, |
| 764 | const struct ip_tunnel_info *info) |
| 765 | { |
| 766 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
| 767 | struct geneve_dev *geneve = netdev_priv(dev); |
| 768 | struct dst_entry *dst = NULL; |
| 769 | struct dst_cache *dst_cache; |
| 770 | __u8 prio; |
| 771 | |
| 772 | if (!gs6) |
| 773 | return ERR_PTR(-EIO); |
| 774 | |
| 775 | memset(fl6, 0, sizeof(*fl6)); |
| 776 | fl6->flowi6_mark = skb->mark; |
| 777 | fl6->flowi6_proto = IPPROTO_UDP; |
| 778 | fl6->daddr = info->key.u.ipv6.dst; |
| 779 | fl6->saddr = info->key.u.ipv6.src; |
| 780 | prio = info->key.tos; |
| 781 | if ((prio == 1) && !geneve->collect_md) { |
| 782 | prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); |
| 783 | use_cache = false; |
| 784 | } |
| 785 | |
| 786 | fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), |
| 787 | info->key.label); |
| 788 | dst_cache = (struct dst_cache *)&info->dst_cache; |
| 789 | if (use_cache) { |
| 790 | dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); |
| 791 | if (dst) |
| 792 | return dst; |
| 793 | } |
| 794 | if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { |
| 795 | netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); |
| 796 | return ERR_PTR(-ENETUNREACH); |
| 797 | } |
| 798 | if (dst->dev == dev) { /* is this necessary? */ |
| 799 | netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); |
| 800 | dst_release(dst); |
| 801 | return ERR_PTR(-ELOOP); |
| 802 | } |
| 803 | |
| 804 | if (use_cache) |
| 805 | dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); |
| 806 | return dst; |
| 807 | } |
| 808 | #endif |
| 809 | |
| 810 | static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
| 811 | struct geneve_dev *geneve, |
| 812 | const struct ip_tunnel_info *info) |
| 813 | { |
| 814 | bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
| 815 | struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); |
| 816 | const struct ip_tunnel_key *key = &info->key; |
| 817 | struct rtable *rt; |
| 818 | struct flowi4 fl4; |
| 819 | __u8 tos, ttl; |
| 820 | __be16 sport; |
| 821 | __be16 df; |
| 822 | int err; |
| 823 | |
| 824 | rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); |
| 825 | if (IS_ERR(rt)) |
| 826 | return PTR_ERR(rt); |
| 827 | |
| 828 | sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
| 829 | if (geneve->collect_md) { |
| 830 | tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); |
| 831 | ttl = key->ttl; |
| 832 | } else { |
| 833 | tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); |
| 834 | ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst); |
| 835 | } |
| 836 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
| 837 | |
| 838 | err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); |
| 839 | if (unlikely(err)) |
| 840 | return err; |
| 841 | |
| 842 | udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, |
| 843 | tos, ttl, df, sport, geneve->info.key.tp_dst, |
| 844 | !net_eq(geneve->net, dev_net(geneve->dev)), |
| 845 | !(info->key.tun_flags & TUNNEL_CSUM)); |
| 846 | return 0; |
| 847 | } |
| 848 | |
| 849 | #if IS_ENABLED(CONFIG_IPV6) |
| 850 | static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
| 851 | struct geneve_dev *geneve, |
| 852 | const struct ip_tunnel_info *info) |
| 853 | { |
| 854 | bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
| 855 | struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); |
| 856 | const struct ip_tunnel_key *key = &info->key; |
| 857 | struct dst_entry *dst = NULL; |
| 858 | struct flowi6 fl6; |
| 859 | __u8 prio, ttl; |
| 860 | __be16 sport; |
| 861 | int err; |
| 862 | |
| 863 | dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); |
| 864 | if (IS_ERR(dst)) |
| 865 | return PTR_ERR(dst); |
| 866 | |
| 867 | sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
| 868 | if (geneve->collect_md) { |
| 869 | prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); |
| 870 | ttl = key->ttl; |
| 871 | } else { |
| 872 | prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), |
| 873 | ip_hdr(skb), skb); |
| 874 | ttl = key->ttl ? : ip6_dst_hoplimit(dst); |
| 875 | } |
| 876 | err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); |
| 877 | if (unlikely(err)) |
| 878 | return err; |
| 879 | |
| 880 | udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, |
| 881 | &fl6.saddr, &fl6.daddr, prio, ttl, |
| 882 | info->key.label, sport, geneve->info.key.tp_dst, |
| 883 | !(info->key.tun_flags & TUNNEL_CSUM)); |
| 884 | return 0; |
| 885 | } |
| 886 | #endif |
| 887 | |
| 888 | static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) |
| 889 | { |
| 890 | struct geneve_dev *geneve = netdev_priv(dev); |
| 891 | struct ip_tunnel_info *info = NULL; |
| 892 | int err; |
| 893 | |
| 894 | if (geneve->collect_md) { |
| 895 | info = skb_tunnel_info(skb); |
| 896 | if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { |
| 897 | err = -EINVAL; |
| 898 | netdev_dbg(dev, "no tunnel metadata\n"); |
| 899 | goto tx_error; |
| 900 | } |
| 901 | } else { |
| 902 | info = &geneve->info; |
| 903 | } |
| 904 | |
| 905 | rcu_read_lock(); |
| 906 | #if IS_ENABLED(CONFIG_IPV6) |
| 907 | if (info->mode & IP_TUNNEL_INFO_IPV6) |
| 908 | err = geneve6_xmit_skb(skb, dev, geneve, info); |
| 909 | else |
| 910 | #endif |
| 911 | err = geneve_xmit_skb(skb, dev, geneve, info); |
| 912 | rcu_read_unlock(); |
| 913 | |
| 914 | if (likely(!err)) |
| 915 | return NETDEV_TX_OK; |
| 916 | tx_error: |
| 917 | dev_kfree_skb(skb); |
| 918 | |
| 919 | if (err == -ELOOP) |
| 920 | dev->stats.collisions++; |
| 921 | else if (err == -ENETUNREACH) |
| 922 | dev->stats.tx_carrier_errors++; |
| 923 | |
| 924 | dev->stats.tx_errors++; |
| 925 | return NETDEV_TX_OK; |
| 926 | } |
| 927 | |
| 928 | static int geneve_change_mtu(struct net_device *dev, int new_mtu) |
| 929 | { |
| 930 | /* Only possible if called internally, ndo_change_mtu path's new_mtu |
| 931 | * is guaranteed to be between dev->min_mtu and dev->max_mtu. |
| 932 | */ |
| 933 | if (new_mtu > dev->max_mtu) |
| 934 | new_mtu = dev->max_mtu; |
| 935 | |
| 936 | dev->mtu = new_mtu; |
| 937 | return 0; |
| 938 | } |
| 939 | |
| 940 | static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
| 941 | { |
| 942 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
| 943 | struct geneve_dev *geneve = netdev_priv(dev); |
| 944 | |
| 945 | if (ip_tunnel_info_af(info) == AF_INET) { |
| 946 | struct rtable *rt; |
| 947 | struct flowi4 fl4; |
| 948 | struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); |
| 949 | |
| 950 | rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); |
| 951 | if (IS_ERR(rt)) |
| 952 | return PTR_ERR(rt); |
| 953 | |
| 954 | ip_rt_put(rt); |
| 955 | info->key.u.ipv4.src = fl4.saddr; |
| 956 | #if IS_ENABLED(CONFIG_IPV6) |
| 957 | } else if (ip_tunnel_info_af(info) == AF_INET6) { |
| 958 | struct dst_entry *dst; |
| 959 | struct flowi6 fl6; |
| 960 | struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); |
| 961 | |
| 962 | dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); |
| 963 | if (IS_ERR(dst)) |
| 964 | return PTR_ERR(dst); |
| 965 | |
| 966 | dst_release(dst); |
| 967 | info->key.u.ipv6.src = fl6.saddr; |
| 968 | #endif |
| 969 | } else { |
| 970 | return -EINVAL; |
| 971 | } |
| 972 | |
| 973 | info->key.tp_src = udp_flow_src_port(geneve->net, skb, |
| 974 | 1, USHRT_MAX, true); |
| 975 | info->key.tp_dst = geneve->info.key.tp_dst; |
| 976 | return 0; |
| 977 | } |
| 978 | |
| 979 | static const struct net_device_ops geneve_netdev_ops = { |
| 980 | .ndo_init = geneve_init, |
| 981 | .ndo_uninit = geneve_uninit, |
| 982 | .ndo_open = geneve_open, |
| 983 | .ndo_stop = geneve_stop, |
| 984 | .ndo_start_xmit = geneve_xmit, |
| 985 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
| 986 | .ndo_change_mtu = geneve_change_mtu, |
| 987 | .ndo_validate_addr = eth_validate_addr, |
| 988 | .ndo_set_mac_address = eth_mac_addr, |
| 989 | .ndo_fill_metadata_dst = geneve_fill_metadata_dst, |
| 990 | }; |
| 991 | |
| 992 | static void geneve_get_drvinfo(struct net_device *dev, |
| 993 | struct ethtool_drvinfo *drvinfo) |
| 994 | { |
| 995 | strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); |
| 996 | strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); |
| 997 | } |
| 998 | |
| 999 | static const struct ethtool_ops geneve_ethtool_ops = { |
| 1000 | .get_drvinfo = geneve_get_drvinfo, |
| 1001 | .get_link = ethtool_op_get_link, |
| 1002 | }; |
| 1003 | |
| 1004 | /* Info for udev, that this is a virtual tunnel endpoint */ |
| 1005 | static struct device_type geneve_type = { |
| 1006 | .name = "geneve", |
| 1007 | }; |
| 1008 | |
| 1009 | /* Calls the ndo_udp_tunnel_add of the caller in order to |
| 1010 | * supply the listening GENEVE udp ports. Callers are expected |
| 1011 | * to implement the ndo_udp_tunnel_add. |
| 1012 | */ |
| 1013 | static void geneve_offload_rx_ports(struct net_device *dev, bool push) |
| 1014 | { |
| 1015 | struct net *net = dev_net(dev); |
| 1016 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 1017 | struct geneve_sock *gs; |
| 1018 | |
| 1019 | rcu_read_lock(); |
| 1020 | list_for_each_entry_rcu(gs, &gn->sock_list, list) { |
| 1021 | if (push) { |
| 1022 | udp_tunnel_push_rx_port(dev, gs->sock, |
| 1023 | UDP_TUNNEL_TYPE_GENEVE); |
| 1024 | } else { |
| 1025 | udp_tunnel_drop_rx_port(dev, gs->sock, |
| 1026 | UDP_TUNNEL_TYPE_GENEVE); |
| 1027 | } |
| 1028 | } |
| 1029 | rcu_read_unlock(); |
| 1030 | } |
| 1031 | |
| 1032 | /* Initialize the device structure. */ |
| 1033 | static void geneve_setup(struct net_device *dev) |
| 1034 | { |
| 1035 | ether_setup(dev); |
| 1036 | |
| 1037 | dev->netdev_ops = &geneve_netdev_ops; |
| 1038 | dev->ethtool_ops = &geneve_ethtool_ops; |
| 1039 | dev->needs_free_netdev = true; |
| 1040 | |
| 1041 | SET_NETDEV_DEVTYPE(dev, &geneve_type); |
| 1042 | |
| 1043 | dev->features |= NETIF_F_LLTX; |
| 1044 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| 1045 | dev->features |= NETIF_F_RXCSUM; |
| 1046 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 1047 | |
| 1048 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| 1049 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| 1050 | |
| 1051 | /* MTU range: 68 - (something less than 65535) */ |
| 1052 | dev->min_mtu = ETH_MIN_MTU; |
| 1053 | /* The max_mtu calculation does not take account of GENEVE |
| 1054 | * options, to avoid excluding potentially valid |
| 1055 | * configurations. This will be further reduced by IPvX hdr size. |
| 1056 | */ |
| 1057 | dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; |
| 1058 | |
| 1059 | netif_keep_dst(dev); |
| 1060 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
| 1061 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
| 1062 | eth_hw_addr_random(dev); |
| 1063 | } |
| 1064 | |
| 1065 | static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { |
| 1066 | [IFLA_GENEVE_ID] = { .type = NLA_U32 }, |
| 1067 | [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
| 1068 | [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, |
| 1069 | [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, |
| 1070 | [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, |
| 1071 | [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, |
| 1072 | [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, |
| 1073 | [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
| 1074 | [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, |
| 1075 | [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, |
| 1076 | [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, |
| 1077 | }; |
| 1078 | |
| 1079 | static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], |
| 1080 | struct netlink_ext_ack *extack) |
| 1081 | { |
| 1082 | if (tb[IFLA_ADDRESS]) { |
| 1083 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
| 1084 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], |
| 1085 | "Provided link layer address is not Ethernet"); |
| 1086 | return -EINVAL; |
| 1087 | } |
| 1088 | |
| 1089 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { |
| 1090 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], |
| 1091 | "Provided Ethernet address is not unicast"); |
| 1092 | return -EADDRNOTAVAIL; |
| 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | if (!data) { |
| 1097 | NL_SET_ERR_MSG(extack, |
| 1098 | "Not enough attributes provided to perform the operation"); |
| 1099 | return -EINVAL; |
| 1100 | } |
| 1101 | |
| 1102 | if (data[IFLA_GENEVE_ID]) { |
| 1103 | __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 1104 | |
| 1105 | if (vni >= GENEVE_N_VID) { |
| 1106 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], |
| 1107 | "Geneve ID must be lower than 16777216"); |
| 1108 | return -ERANGE; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | return 0; |
| 1113 | } |
| 1114 | |
| 1115 | static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, |
| 1116 | const struct ip_tunnel_info *info, |
| 1117 | bool *tun_on_same_port, |
| 1118 | bool *tun_collect_md) |
| 1119 | { |
| 1120 | struct geneve_dev *geneve, *t = NULL; |
| 1121 | |
| 1122 | *tun_on_same_port = false; |
| 1123 | *tun_collect_md = false; |
| 1124 | list_for_each_entry(geneve, &gn->geneve_list, next) { |
| 1125 | if (info->key.tp_dst == geneve->info.key.tp_dst) { |
| 1126 | *tun_collect_md = geneve->collect_md; |
| 1127 | *tun_on_same_port = true; |
| 1128 | } |
| 1129 | if (info->key.tun_id == geneve->info.key.tun_id && |
| 1130 | info->key.tp_dst == geneve->info.key.tp_dst && |
| 1131 | !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u))) |
| 1132 | t = geneve; |
| 1133 | } |
| 1134 | return t; |
| 1135 | } |
| 1136 | |
| 1137 | static bool is_tnl_info_zero(const struct ip_tunnel_info *info) |
| 1138 | { |
| 1139 | return !(info->key.tun_id || info->key.tun_flags || info->key.tos || |
| 1140 | info->key.ttl || info->key.label || info->key.tp_src || |
| 1141 | memchr_inv(&info->key.u, 0, sizeof(info->key.u))); |
| 1142 | } |
| 1143 | |
| 1144 | static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, |
| 1145 | struct ip_tunnel_info *b) |
| 1146 | { |
| 1147 | if (ip_tunnel_info_af(a) == AF_INET) |
| 1148 | return a->key.u.ipv4.dst == b->key.u.ipv4.dst; |
| 1149 | else |
| 1150 | return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); |
| 1151 | } |
| 1152 | |
| 1153 | static int geneve_configure(struct net *net, struct net_device *dev, |
| 1154 | struct netlink_ext_ack *extack, |
| 1155 | const struct ip_tunnel_info *info, |
| 1156 | bool metadata, bool ipv6_rx_csum) |
| 1157 | { |
| 1158 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 1159 | struct geneve_dev *t, *geneve = netdev_priv(dev); |
| 1160 | bool tun_collect_md, tun_on_same_port; |
| 1161 | int err, encap_len; |
| 1162 | |
| 1163 | if (metadata && !is_tnl_info_zero(info)) { |
| 1164 | NL_SET_ERR_MSG(extack, |
| 1165 | "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); |
| 1166 | return -EINVAL; |
| 1167 | } |
| 1168 | |
| 1169 | geneve->net = net; |
| 1170 | geneve->dev = dev; |
| 1171 | |
| 1172 | t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); |
| 1173 | if (t) |
| 1174 | return -EBUSY; |
| 1175 | |
| 1176 | /* make enough headroom for basic scenario */ |
| 1177 | encap_len = GENEVE_BASE_HLEN + ETH_HLEN; |
| 1178 | if (!metadata && ip_tunnel_info_af(info) == AF_INET) { |
| 1179 | encap_len += sizeof(struct iphdr); |
| 1180 | dev->max_mtu -= sizeof(struct iphdr); |
| 1181 | } else { |
| 1182 | encap_len += sizeof(struct ipv6hdr); |
| 1183 | dev->max_mtu -= sizeof(struct ipv6hdr); |
| 1184 | } |
| 1185 | dev->needed_headroom = encap_len + ETH_HLEN; |
| 1186 | |
| 1187 | if (metadata) { |
| 1188 | if (tun_on_same_port) { |
| 1189 | NL_SET_ERR_MSG(extack, |
| 1190 | "There can be only one externally controlled device on a destination port"); |
| 1191 | return -EPERM; |
| 1192 | } |
| 1193 | } else { |
| 1194 | if (tun_collect_md) { |
| 1195 | NL_SET_ERR_MSG(extack, |
| 1196 | "There already exists an externally controlled device on this destination port"); |
| 1197 | return -EPERM; |
| 1198 | } |
| 1199 | } |
| 1200 | |
| 1201 | dst_cache_reset(&geneve->info.dst_cache); |
| 1202 | geneve->info = *info; |
| 1203 | geneve->collect_md = metadata; |
| 1204 | geneve->use_udp6_rx_checksums = ipv6_rx_csum; |
| 1205 | |
| 1206 | err = register_netdevice(dev); |
| 1207 | if (err) |
| 1208 | return err; |
| 1209 | |
| 1210 | list_add(&geneve->next, &gn->geneve_list); |
| 1211 | return 0; |
| 1212 | } |
| 1213 | |
| 1214 | static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) |
| 1215 | { |
| 1216 | memset(info, 0, sizeof(*info)); |
| 1217 | info->key.tp_dst = htons(dst_port); |
| 1218 | } |
| 1219 | |
| 1220 | static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], |
| 1221 | struct netlink_ext_ack *extack, |
| 1222 | struct ip_tunnel_info *info, bool *metadata, |
| 1223 | bool *use_udp6_rx_checksums, bool changelink) |
| 1224 | { |
| 1225 | int attrtype; |
| 1226 | |
| 1227 | if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { |
| 1228 | NL_SET_ERR_MSG(extack, |
| 1229 | "Cannot specify both IPv4 and IPv6 Remote addresses"); |
| 1230 | return -EINVAL; |
| 1231 | } |
| 1232 | |
| 1233 | if (data[IFLA_GENEVE_REMOTE]) { |
| 1234 | if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { |
| 1235 | attrtype = IFLA_GENEVE_REMOTE; |
| 1236 | goto change_notsup; |
| 1237 | } |
| 1238 | |
| 1239 | info->key.u.ipv4.dst = |
| 1240 | nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); |
| 1241 | |
| 1242 | if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) { |
| 1243 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], |
| 1244 | "Remote IPv4 address cannot be Multicast"); |
| 1245 | return -EINVAL; |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | if (data[IFLA_GENEVE_REMOTE6]) { |
| 1250 | #if IS_ENABLED(CONFIG_IPV6) |
| 1251 | if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { |
| 1252 | attrtype = IFLA_GENEVE_REMOTE6; |
| 1253 | goto change_notsup; |
| 1254 | } |
| 1255 | |
| 1256 | info->mode = IP_TUNNEL_INFO_IPV6; |
| 1257 | info->key.u.ipv6.dst = |
| 1258 | nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); |
| 1259 | |
| 1260 | if (ipv6_addr_type(&info->key.u.ipv6.dst) & |
| 1261 | IPV6_ADDR_LINKLOCAL) { |
| 1262 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], |
| 1263 | "Remote IPv6 address cannot be link-local"); |
| 1264 | return -EINVAL; |
| 1265 | } |
| 1266 | if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { |
| 1267 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], |
| 1268 | "Remote IPv6 address cannot be Multicast"); |
| 1269 | return -EINVAL; |
| 1270 | } |
| 1271 | info->key.tun_flags |= TUNNEL_CSUM; |
| 1272 | *use_udp6_rx_checksums = true; |
| 1273 | #else |
| 1274 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], |
| 1275 | "IPv6 support not enabled in the kernel"); |
| 1276 | return -EPFNOSUPPORT; |
| 1277 | #endif |
| 1278 | } |
| 1279 | |
| 1280 | if (data[IFLA_GENEVE_ID]) { |
| 1281 | __u32 vni; |
| 1282 | __u8 tvni[3]; |
| 1283 | __be64 tunid; |
| 1284 | |
| 1285 | vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| 1286 | tvni[0] = (vni & 0x00ff0000) >> 16; |
| 1287 | tvni[1] = (vni & 0x0000ff00) >> 8; |
| 1288 | tvni[2] = vni & 0x000000ff; |
| 1289 | |
| 1290 | tunid = vni_to_tunnel_id(tvni); |
| 1291 | if (changelink && (tunid != info->key.tun_id)) { |
| 1292 | attrtype = IFLA_GENEVE_ID; |
| 1293 | goto change_notsup; |
| 1294 | } |
| 1295 | info->key.tun_id = tunid; |
| 1296 | } |
| 1297 | |
| 1298 | if (data[IFLA_GENEVE_TTL]) |
| 1299 | info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
| 1300 | |
| 1301 | if (data[IFLA_GENEVE_TOS]) |
| 1302 | info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
| 1303 | |
| 1304 | if (data[IFLA_GENEVE_LABEL]) { |
| 1305 | info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & |
| 1306 | IPV6_FLOWLABEL_MASK; |
| 1307 | if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { |
| 1308 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], |
| 1309 | "Label attribute only applies for IPv6 Geneve devices"); |
| 1310 | return -EINVAL; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | if (data[IFLA_GENEVE_PORT]) { |
| 1315 | if (changelink) { |
| 1316 | attrtype = IFLA_GENEVE_PORT; |
| 1317 | goto change_notsup; |
| 1318 | } |
| 1319 | info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); |
| 1320 | } |
| 1321 | |
| 1322 | if (data[IFLA_GENEVE_COLLECT_METADATA]) { |
| 1323 | if (changelink) { |
| 1324 | attrtype = IFLA_GENEVE_COLLECT_METADATA; |
| 1325 | goto change_notsup; |
| 1326 | } |
| 1327 | *metadata = true; |
| 1328 | } |
| 1329 | |
| 1330 | if (data[IFLA_GENEVE_UDP_CSUM]) { |
| 1331 | if (changelink) { |
| 1332 | attrtype = IFLA_GENEVE_UDP_CSUM; |
| 1333 | goto change_notsup; |
| 1334 | } |
| 1335 | if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) |
| 1336 | info->key.tun_flags |= TUNNEL_CSUM; |
| 1337 | } |
| 1338 | |
| 1339 | if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { |
| 1340 | #if IS_ENABLED(CONFIG_IPV6) |
| 1341 | if (changelink) { |
| 1342 | attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; |
| 1343 | goto change_notsup; |
| 1344 | } |
| 1345 | if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) |
| 1346 | info->key.tun_flags &= ~TUNNEL_CSUM; |
| 1347 | #else |
| 1348 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], |
| 1349 | "IPv6 support not enabled in the kernel"); |
| 1350 | return -EPFNOSUPPORT; |
| 1351 | #endif |
| 1352 | } |
| 1353 | |
| 1354 | if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { |
| 1355 | #if IS_ENABLED(CONFIG_IPV6) |
| 1356 | if (changelink) { |
| 1357 | attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; |
| 1358 | goto change_notsup; |
| 1359 | } |
| 1360 | if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) |
| 1361 | *use_udp6_rx_checksums = false; |
| 1362 | #else |
| 1363 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], |
| 1364 | "IPv6 support not enabled in the kernel"); |
| 1365 | return -EPFNOSUPPORT; |
| 1366 | #endif |
| 1367 | } |
| 1368 | |
| 1369 | return 0; |
| 1370 | change_notsup: |
| 1371 | NL_SET_ERR_MSG_ATTR(extack, data[attrtype], |
| 1372 | "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); |
| 1373 | return -EOPNOTSUPP; |
| 1374 | } |
| 1375 | |
| 1376 | static int geneve_newlink(struct net *net, struct net_device *dev, |
| 1377 | struct nlattr *tb[], struct nlattr *data[], |
| 1378 | struct netlink_ext_ack *extack) |
| 1379 | { |
| 1380 | bool use_udp6_rx_checksums = false; |
| 1381 | struct ip_tunnel_info info; |
| 1382 | bool metadata = false; |
| 1383 | int err; |
| 1384 | |
| 1385 | init_tnl_info(&info, GENEVE_UDP_PORT); |
| 1386 | err = geneve_nl2info(tb, data, extack, &info, &metadata, |
| 1387 | &use_udp6_rx_checksums, false); |
| 1388 | if (err) |
| 1389 | return err; |
| 1390 | |
| 1391 | return geneve_configure(net, dev, extack, &info, metadata, |
| 1392 | use_udp6_rx_checksums); |
| 1393 | } |
| 1394 | |
| 1395 | /* Quiesces the geneve device data path for both TX and RX. |
| 1396 | * |
| 1397 | * On transmit geneve checks for non-NULL geneve_sock before it proceeds. |
| 1398 | * So, if we set that socket to NULL under RCU and wait for synchronize_net() |
| 1399 | * to complete for the existing set of in-flight packets to be transmitted, |
| 1400 | * then we would have quiesced the transmit data path. All the future packets |
| 1401 | * will get dropped until we unquiesce the data path. |
| 1402 | * |
| 1403 | * On receive geneve dereference the geneve_sock stashed in the socket. So, |
| 1404 | * if we set that to NULL under RCU and wait for synchronize_net() to |
| 1405 | * complete, then we would have quiesced the receive data path. |
| 1406 | */ |
| 1407 | static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, |
| 1408 | struct geneve_sock **gs6) |
| 1409 | { |
| 1410 | *gs4 = rtnl_dereference(geneve->sock4); |
| 1411 | rcu_assign_pointer(geneve->sock4, NULL); |
| 1412 | if (*gs4) |
| 1413 | rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); |
| 1414 | #if IS_ENABLED(CONFIG_IPV6) |
| 1415 | *gs6 = rtnl_dereference(geneve->sock6); |
| 1416 | rcu_assign_pointer(geneve->sock6, NULL); |
| 1417 | if (*gs6) |
| 1418 | rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); |
| 1419 | #else |
| 1420 | *gs6 = NULL; |
| 1421 | #endif |
| 1422 | synchronize_net(); |
| 1423 | } |
| 1424 | |
| 1425 | /* Resumes the geneve device data path for both TX and RX. */ |
| 1426 | static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, |
| 1427 | struct geneve_sock __maybe_unused *gs6) |
| 1428 | { |
| 1429 | rcu_assign_pointer(geneve->sock4, gs4); |
| 1430 | if (gs4) |
| 1431 | rcu_assign_sk_user_data(gs4->sock->sk, gs4); |
| 1432 | #if IS_ENABLED(CONFIG_IPV6) |
| 1433 | rcu_assign_pointer(geneve->sock6, gs6); |
| 1434 | if (gs6) |
| 1435 | rcu_assign_sk_user_data(gs6->sock->sk, gs6); |
| 1436 | #endif |
| 1437 | synchronize_net(); |
| 1438 | } |
| 1439 | |
| 1440 | static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], |
| 1441 | struct nlattr *data[], |
| 1442 | struct netlink_ext_ack *extack) |
| 1443 | { |
| 1444 | struct geneve_dev *geneve = netdev_priv(dev); |
| 1445 | struct geneve_sock *gs4, *gs6; |
| 1446 | struct ip_tunnel_info info; |
| 1447 | bool metadata; |
| 1448 | bool use_udp6_rx_checksums; |
| 1449 | int err; |
| 1450 | |
| 1451 | /* If the geneve device is configured for metadata (or externally |
| 1452 | * controlled, for example, OVS), then nothing can be changed. |
| 1453 | */ |
| 1454 | if (geneve->collect_md) |
| 1455 | return -EOPNOTSUPP; |
| 1456 | |
| 1457 | /* Start with the existing info. */ |
| 1458 | memcpy(&info, &geneve->info, sizeof(info)); |
| 1459 | metadata = geneve->collect_md; |
| 1460 | use_udp6_rx_checksums = geneve->use_udp6_rx_checksums; |
| 1461 | err = geneve_nl2info(tb, data, extack, &info, &metadata, |
| 1462 | &use_udp6_rx_checksums, true); |
| 1463 | if (err) |
| 1464 | return err; |
| 1465 | |
| 1466 | if (!geneve_dst_addr_equal(&geneve->info, &info)) |
| 1467 | dst_cache_reset(&info.dst_cache); |
| 1468 | |
| 1469 | geneve_quiesce(geneve, &gs4, &gs6); |
| 1470 | geneve->info = info; |
| 1471 | geneve->collect_md = metadata; |
| 1472 | geneve->use_udp6_rx_checksums = use_udp6_rx_checksums; |
| 1473 | geneve_unquiesce(geneve, gs4, gs6); |
| 1474 | |
| 1475 | return 0; |
| 1476 | } |
| 1477 | |
| 1478 | static void geneve_dellink(struct net_device *dev, struct list_head *head) |
| 1479 | { |
| 1480 | struct geneve_dev *geneve = netdev_priv(dev); |
| 1481 | |
| 1482 | list_del(&geneve->next); |
| 1483 | unregister_netdevice_queue(dev, head); |
| 1484 | } |
| 1485 | |
| 1486 | static size_t geneve_get_size(const struct net_device *dev) |
| 1487 | { |
| 1488 | return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ |
| 1489 | nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ |
| 1490 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ |
| 1491 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ |
| 1492 | nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ |
| 1493 | nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ |
| 1494 | nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ |
| 1495 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ |
| 1496 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ |
| 1497 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ |
| 1498 | 0; |
| 1499 | } |
| 1500 | |
| 1501 | static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 1502 | { |
| 1503 | struct geneve_dev *geneve = netdev_priv(dev); |
| 1504 | struct ip_tunnel_info *info = &geneve->info; |
| 1505 | bool metadata = geneve->collect_md; |
| 1506 | __u8 tmp_vni[3]; |
| 1507 | __u32 vni; |
| 1508 | |
| 1509 | tunnel_id_to_vni(info->key.tun_id, tmp_vni); |
| 1510 | vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; |
| 1511 | if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) |
| 1512 | goto nla_put_failure; |
| 1513 | |
| 1514 | if (!metadata && ip_tunnel_info_af(info) == AF_INET) { |
| 1515 | if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, |
| 1516 | info->key.u.ipv4.dst)) |
| 1517 | goto nla_put_failure; |
| 1518 | if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, |
| 1519 | !!(info->key.tun_flags & TUNNEL_CSUM))) |
| 1520 | goto nla_put_failure; |
| 1521 | |
| 1522 | #if IS_ENABLED(CONFIG_IPV6) |
| 1523 | } else if (!metadata) { |
| 1524 | if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, |
| 1525 | &info->key.u.ipv6.dst)) |
| 1526 | goto nla_put_failure; |
| 1527 | if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, |
| 1528 | !(info->key.tun_flags & TUNNEL_CSUM))) |
| 1529 | goto nla_put_failure; |
| 1530 | #endif |
| 1531 | } |
| 1532 | |
| 1533 | if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || |
| 1534 | nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || |
| 1535 | nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) |
| 1536 | goto nla_put_failure; |
| 1537 | |
| 1538 | if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) |
| 1539 | goto nla_put_failure; |
| 1540 | |
| 1541 | if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) |
| 1542 | goto nla_put_failure; |
| 1543 | |
| 1544 | #if IS_ENABLED(CONFIG_IPV6) |
| 1545 | if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, |
| 1546 | !geneve->use_udp6_rx_checksums)) |
| 1547 | goto nla_put_failure; |
| 1548 | #endif |
| 1549 | |
| 1550 | return 0; |
| 1551 | |
| 1552 | nla_put_failure: |
| 1553 | return -EMSGSIZE; |
| 1554 | } |
| 1555 | |
| 1556 | static struct rtnl_link_ops geneve_link_ops __read_mostly = { |
| 1557 | .kind = "geneve", |
| 1558 | .maxtype = IFLA_GENEVE_MAX, |
| 1559 | .policy = geneve_policy, |
| 1560 | .priv_size = sizeof(struct geneve_dev), |
| 1561 | .setup = geneve_setup, |
| 1562 | .validate = geneve_validate, |
| 1563 | .newlink = geneve_newlink, |
| 1564 | .changelink = geneve_changelink, |
| 1565 | .dellink = geneve_dellink, |
| 1566 | .get_size = geneve_get_size, |
| 1567 | .fill_info = geneve_fill_info, |
| 1568 | }; |
| 1569 | |
| 1570 | struct net_device *geneve_dev_create_fb(struct net *net, const char *name, |
| 1571 | u8 name_assign_type, u16 dst_port) |
| 1572 | { |
| 1573 | struct nlattr *tb[IFLA_MAX + 1]; |
| 1574 | struct ip_tunnel_info info; |
| 1575 | struct net_device *dev; |
| 1576 | LIST_HEAD(list_kill); |
| 1577 | int err; |
| 1578 | |
| 1579 | memset(tb, 0, sizeof(tb)); |
| 1580 | dev = rtnl_create_link(net, name, name_assign_type, |
| 1581 | &geneve_link_ops, tb); |
| 1582 | if (IS_ERR(dev)) |
| 1583 | return dev; |
| 1584 | |
| 1585 | init_tnl_info(&info, dst_port); |
| 1586 | err = geneve_configure(net, dev, NULL, &info, true, true); |
| 1587 | if (err) { |
| 1588 | free_netdev(dev); |
| 1589 | return ERR_PTR(err); |
| 1590 | } |
| 1591 | |
| 1592 | /* openvswitch users expect packet sizes to be unrestricted, |
| 1593 | * so set the largest MTU we can. |
| 1594 | */ |
| 1595 | err = geneve_change_mtu(dev, IP_MAX_MTU); |
| 1596 | if (err) |
| 1597 | goto err; |
| 1598 | |
| 1599 | err = rtnl_configure_link(dev, NULL); |
| 1600 | if (err < 0) |
| 1601 | goto err; |
| 1602 | |
| 1603 | return dev; |
| 1604 | err: |
| 1605 | geneve_dellink(dev, &list_kill); |
| 1606 | unregister_netdevice_many(&list_kill); |
| 1607 | return ERR_PTR(err); |
| 1608 | } |
| 1609 | EXPORT_SYMBOL_GPL(geneve_dev_create_fb); |
| 1610 | |
| 1611 | static int geneve_netdevice_event(struct notifier_block *unused, |
| 1612 | unsigned long event, void *ptr) |
| 1613 | { |
| 1614 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 1615 | |
| 1616 | if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || |
| 1617 | event == NETDEV_UDP_TUNNEL_DROP_INFO) { |
| 1618 | geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); |
| 1619 | } else if (event == NETDEV_UNREGISTER) { |
| 1620 | geneve_offload_rx_ports(dev, false); |
| 1621 | } else if (event == NETDEV_REGISTER) { |
| 1622 | geneve_offload_rx_ports(dev, true); |
| 1623 | } |
| 1624 | |
| 1625 | return NOTIFY_DONE; |
| 1626 | } |
| 1627 | |
| 1628 | static struct notifier_block geneve_notifier_block __read_mostly = { |
| 1629 | .notifier_call = geneve_netdevice_event, |
| 1630 | }; |
| 1631 | |
| 1632 | static __net_init int geneve_init_net(struct net *net) |
| 1633 | { |
| 1634 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 1635 | |
| 1636 | INIT_LIST_HEAD(&gn->geneve_list); |
| 1637 | INIT_LIST_HEAD(&gn->sock_list); |
| 1638 | return 0; |
| 1639 | } |
| 1640 | |
| 1641 | static void __net_exit geneve_exit_net(struct net *net) |
| 1642 | { |
| 1643 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
| 1644 | struct geneve_dev *geneve, *next; |
| 1645 | struct net_device *dev, *aux; |
| 1646 | LIST_HEAD(list); |
| 1647 | |
| 1648 | rtnl_lock(); |
| 1649 | |
| 1650 | /* gather any geneve devices that were moved into this ns */ |
| 1651 | for_each_netdev_safe(net, dev, aux) |
| 1652 | if (dev->rtnl_link_ops == &geneve_link_ops) |
| 1653 | unregister_netdevice_queue(dev, &list); |
| 1654 | |
| 1655 | /* now gather any other geneve devices that were created in this ns */ |
| 1656 | list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { |
| 1657 | /* If geneve->dev is in the same netns, it was already added |
| 1658 | * to the list by the previous loop. |
| 1659 | */ |
| 1660 | if (!net_eq(dev_net(geneve->dev), net)) |
| 1661 | unregister_netdevice_queue(geneve->dev, &list); |
| 1662 | } |
| 1663 | |
| 1664 | /* unregister the devices gathered above */ |
| 1665 | unregister_netdevice_many(&list); |
| 1666 | rtnl_unlock(); |
| 1667 | WARN_ON_ONCE(!list_empty(&gn->sock_list)); |
| 1668 | } |
| 1669 | |
| 1670 | static struct pernet_operations geneve_net_ops = { |
| 1671 | .init = geneve_init_net, |
| 1672 | .exit = geneve_exit_net, |
| 1673 | .id = &geneve_net_id, |
| 1674 | .size = sizeof(struct geneve_net), |
| 1675 | }; |
| 1676 | |
| 1677 | static int __init geneve_init_module(void) |
| 1678 | { |
| 1679 | int rc; |
| 1680 | |
| 1681 | rc = register_pernet_subsys(&geneve_net_ops); |
| 1682 | if (rc) |
| 1683 | goto out1; |
| 1684 | |
| 1685 | rc = register_netdevice_notifier(&geneve_notifier_block); |
| 1686 | if (rc) |
| 1687 | goto out2; |
| 1688 | |
| 1689 | rc = rtnl_link_register(&geneve_link_ops); |
| 1690 | if (rc) |
| 1691 | goto out3; |
| 1692 | |
| 1693 | return 0; |
| 1694 | out3: |
| 1695 | unregister_netdevice_notifier(&geneve_notifier_block); |
| 1696 | out2: |
| 1697 | unregister_pernet_subsys(&geneve_net_ops); |
| 1698 | out1: |
| 1699 | return rc; |
| 1700 | } |
| 1701 | late_initcall(geneve_init_module); |
| 1702 | |
| 1703 | static void __exit geneve_cleanup_module(void) |
| 1704 | { |
| 1705 | rtnl_link_unregister(&geneve_link_ops); |
| 1706 | unregister_netdevice_notifier(&geneve_notifier_block); |
| 1707 | unregister_pernet_subsys(&geneve_net_ops); |
| 1708 | } |
| 1709 | module_exit(geneve_cleanup_module); |
| 1710 | |
| 1711 | MODULE_LICENSE("GPL"); |
| 1712 | MODULE_VERSION(GENEVE_NETDEV_VER); |
| 1713 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); |
| 1714 | MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); |
| 1715 | MODULE_ALIAS_RTNL_LINK("geneve"); |