1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __NET_VXLAN_H 3 #define __NET_VXLAN_H 1 4 5 #include <linux/if_vlan.h> 6 #include <linux/rhashtable-types.h> 7 #include <net/udp_tunnel.h> 8 #include <net/dst_metadata.h> 9 #include <net/rtnetlink.h> 10 #include <net/switchdev.h> 11 #include <net/nexthop.h> 12 13 #define IANA_VXLAN_UDP_PORT 4789 14 #define IANA_VXLAN_GPE_UDP_PORT 4790 15 16 /* VXLAN protocol (RFC 7348) header: 17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 18 * |R|R|R|R|I|R|R|R| Reserved | 19 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 20 * | VXLAN Network Identifier (VNI) | Reserved | 21 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22 * 23 * I = VXLAN Network Identifier (VNI) present. 24 */ 25 struct vxlanhdr { 26 __be32 vx_flags; 27 __be32 vx_vni; 28 }; 29 30 /* VXLAN header flags. */ 31 #define VXLAN_HF_VNI cpu_to_be32(BIT(27)) 32 33 #define VXLAN_N_VID (1u << 24) 34 #define VXLAN_VID_MASK (VXLAN_N_VID - 1) 35 #define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8) 36 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) 37 38 #define VNI_HASH_BITS 10 39 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 40 #define FDB_HASH_BITS 8 41 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) 42 43 /* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X): 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * |R|R|R|R|I|R|R|R|R|R|C| Reserved | 46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 47 * | VXLAN Network Identifier (VNI) |O| Csum start | 48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 49 * 50 * C = Remote checksum offload bit. When set indicates that the 51 * remote checksum offload data is present. 52 * 53 * O = Offset bit. Indicates the checksum offset relative to 54 * checksum start. 55 * 56 * Csum start = Checksum start divided by two. 57 * 58 * http://tools.ietf.org/html/draft-herbert-vxlan-rco 59 */ 60 61 /* VXLAN-RCO header flags. */ 62 #define VXLAN_HF_RCO cpu_to_be32(BIT(21)) 63 64 /* Remote checksum offload header option */ 65 #define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */ 66 #define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */ 67 #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ 68 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) 69 #define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT) 70 71 /* 72 * VXLAN Group Based Policy Extension (VXLAN_F_GBP): 73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 74 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | 75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 76 * | VXLAN Network Identifier (VNI) | Reserved | 77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 78 * 79 * G = Group Policy ID present. 80 * 81 * D = Don't Learn bit. When set, this bit indicates that the egress 82 * VTEP MUST NOT learn the source address of the encapsulated frame. 83 * 84 * A = Indicates that the group policy has already been applied to 85 * this packet. Policies MUST NOT be applied by devices when the 86 * A bit is set. 87 * 88 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy 89 */ 90 struct vxlanhdr_gbp { 91 u8 vx_flags; 92 #ifdef __LITTLE_ENDIAN_BITFIELD 93 u8 reserved_flags1:3, 94 policy_applied:1, 95 reserved_flags2:2, 96 dont_learn:1, 97 reserved_flags3:1; 98 #elif defined(__BIG_ENDIAN_BITFIELD) 99 u8 reserved_flags1:1, 100 dont_learn:1, 101 reserved_flags2:2, 102 policy_applied:1, 103 reserved_flags3:3; 104 #else 105 #error "Please fix <asm/byteorder.h>" 106 #endif 107 __be16 policy_id; 108 __be32 vx_vni; 109 }; 110 111 /* VXLAN-GBP header flags. */ 112 #define VXLAN_HF_GBP cpu_to_be32(BIT(31)) 113 114 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF)) 115 116 /* skb->mark mapping 117 * 118 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 119 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | 120 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 121 */ 122 #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) 123 #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) 124 #define VXLAN_GBP_ID_MASK (0xFFFF) 125 126 #define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \ 127 VXLAN_GBP_ID_MASK) 128 129 /* 130 * VXLAN Generic Protocol Extension (VXLAN_F_GPE): 131 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 132 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol | 133 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 134 * | VXLAN Network Identifier (VNI) | Reserved | 135 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 136 * 137 * Ver = Version. Indicates VXLAN GPE protocol version. 138 * 139 * P = Next Protocol Bit. The P bit is set to indicate that the 140 * Next Protocol field is present. 141 * 142 * O = OAM Flag Bit. The O bit is set to indicate that the packet 143 * is an OAM packet. 144 * 145 * Next Protocol = This 8 bit field indicates the protocol header 146 * immediately following the VXLAN GPE header. 147 * 148 * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01 149 */ 150 151 struct vxlanhdr_gpe { 152 #if defined(__LITTLE_ENDIAN_BITFIELD) 153 u8 oam_flag:1, 154 reserved_flags1:1, 155 np_applied:1, 156 instance_applied:1, 157 version:2, 158 reserved_flags2:2; 159 #elif defined(__BIG_ENDIAN_BITFIELD) 160 u8 reserved_flags2:2, 161 version:2, 162 instance_applied:1, 163 np_applied:1, 164 reserved_flags1:1, 165 oam_flag:1; 166 #endif 167 u8 reserved_flags3; 168 u8 reserved_flags4; 169 u8 next_protocol; 170 __be32 vx_vni; 171 }; 172 173 /* VXLAN-GPE header flags. */ 174 #define VXLAN_HF_VER cpu_to_be32(BIT(29) | BIT(28)) 175 #define VXLAN_HF_NP cpu_to_be32(BIT(26)) 176 #define VXLAN_HF_OAM cpu_to_be32(BIT(24)) 177 178 #define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \ 179 cpu_to_be32(0xff)) 180 181 struct vxlan_metadata { 182 u32 gbp; 183 }; 184 185 /* per UDP socket information */ 186 struct vxlan_sock { 187 struct hlist_node hlist; 188 struct socket *sock; 189 struct hlist_head vni_list[VNI_HASH_SIZE]; 190 refcount_t refcnt; 191 u32 flags; 192 }; 193 194 union vxlan_addr { 195 struct sockaddr_in sin; 196 struct sockaddr_in6 sin6; 197 struct sockaddr sa; 198 }; 199 200 struct vxlan_rdst { 201 union vxlan_addr remote_ip; 202 __be16 remote_port; 203 u8 offloaded:1; 204 __be32 remote_vni; 205 u32 remote_ifindex; 206 struct net_device *remote_dev; 207 struct list_head list; 208 struct rcu_head rcu; 209 struct dst_cache dst_cache; 210 }; 211 212 struct vxlan_config { 213 union vxlan_addr remote_ip; 214 union vxlan_addr saddr; 215 __be32 vni; 216 int remote_ifindex; 217 int mtu; 218 __be16 dst_port; 219 u16 port_min; 220 u16 port_max; 221 u8 tos; 222 u8 ttl; 223 __be32 label; 224 u32 flags; 225 unsigned long age_interval; 226 unsigned int addrmax; 227 bool no_share; 228 enum ifla_vxlan_df df; 229 }; 230 231 enum { 232 VXLAN_VNI_STATS_RX, 233 VXLAN_VNI_STATS_RX_DROPS, 234 VXLAN_VNI_STATS_RX_ERRORS, 235 VXLAN_VNI_STATS_TX, 236 VXLAN_VNI_STATS_TX_DROPS, 237 VXLAN_VNI_STATS_TX_ERRORS, 238 }; 239 240 struct vxlan_vni_stats { 241 u64 rx_packets; 242 u64 rx_bytes; 243 u64 rx_drops; 244 u64 rx_errors; 245 u64 tx_packets; 246 u64 tx_bytes; 247 u64 tx_drops; 248 u64 tx_errors; 249 }; 250 251 struct vxlan_vni_stats_pcpu { 252 struct vxlan_vni_stats stats; 253 struct u64_stats_sync syncp; 254 }; 255 256 struct vxlan_dev_node { 257 struct hlist_node hlist; 258 struct vxlan_dev *vxlan; 259 }; 260 261 struct vxlan_vni_node { 262 struct rhash_head vnode; 263 struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */ 264 #if IS_ENABLED(CONFIG_IPV6) 265 struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */ 266 #endif 267 struct list_head vlist; 268 __be32 vni; 269 union vxlan_addr remote_ip; /* default remote ip for this vni */ 270 struct vxlan_vni_stats_pcpu __percpu *stats; 271 272 struct rcu_head rcu; 273 }; 274 275 struct vxlan_vni_group { 276 struct rhashtable vni_hash; 277 struct list_head vni_list; 278 u32 num_vnis; 279 }; 280 281 /* Pseudo network device */ 282 struct vxlan_dev { 283 struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */ 284 #if IS_ENABLED(CONFIG_IPV6) 285 struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */ 286 #endif 287 struct list_head next; /* vxlan's per namespace list */ 288 struct vxlan_sock __rcu *vn4_sock; /* listening socket for IPv4 */ 289 #if IS_ENABLED(CONFIG_IPV6) 290 struct vxlan_sock __rcu *vn6_sock; /* listening socket for IPv6 */ 291 #endif 292 struct net_device *dev; 293 struct net *net; /* netns for packet i/o */ 294 struct vxlan_rdst default_dst; /* default destination */ 295 296 struct timer_list age_timer; 297 spinlock_t hash_lock[FDB_HASH_SIZE]; 298 unsigned int addrcnt; 299 struct gro_cells gro_cells; 300 301 struct vxlan_config cfg; 302 303 struct vxlan_vni_group __rcu *vnigrp; 304 305 struct hlist_head fdb_head[FDB_HASH_SIZE]; 306 307 struct rhashtable mdb_tbl; 308 struct hlist_head mdb_list; 309 unsigned int mdb_seq; 310 }; 311 312 #define VXLAN_F_LEARN 0x01 313 #define VXLAN_F_PROXY 0x02 314 #define VXLAN_F_RSC 0x04 315 #define VXLAN_F_L2MISS 0x08 316 #define VXLAN_F_L3MISS 0x10 317 #define VXLAN_F_IPV6 0x20 318 #define VXLAN_F_UDP_ZERO_CSUM_TX 0x40 319 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 320 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 321 #define VXLAN_F_REMCSUM_TX 0x200 322 #define VXLAN_F_REMCSUM_RX 0x400 323 #define VXLAN_F_GBP 0x800 324 #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 325 #define VXLAN_F_COLLECT_METADATA 0x2000 326 #define VXLAN_F_GPE 0x4000 327 #define VXLAN_F_IPV6_LINKLOCAL 0x8000 328 #define VXLAN_F_TTL_INHERIT 0x10000 329 #define VXLAN_F_VNIFILTER 0x20000 330 #define VXLAN_F_MDB 0x40000 331 #define VXLAN_F_LOCALBYPASS 0x80000 332 333 /* Flags that are used in the receive path. These flags must match in 334 * order for a socket to be shareable 335 */ 336 #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ 337 VXLAN_F_GPE | \ 338 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 339 VXLAN_F_REMCSUM_RX | \ 340 VXLAN_F_REMCSUM_NOPARTIAL | \ 341 VXLAN_F_COLLECT_METADATA | \ 342 VXLAN_F_VNIFILTER) 343 344 /* Flags that can be set together with VXLAN_F_GPE. */ 345 #define VXLAN_F_ALLOWED_GPE (VXLAN_F_GPE | \ 346 VXLAN_F_IPV6 | \ 347 VXLAN_F_IPV6_LINKLOCAL | \ 348 VXLAN_F_UDP_ZERO_CSUM_TX | \ 349 VXLAN_F_UDP_ZERO_CSUM6_TX | \ 350 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 351 VXLAN_F_COLLECT_METADATA | \ 352 VXLAN_F_VNIFILTER | \ 353 VXLAN_F_LOCALBYPASS) 354 355 struct net_device *vxlan_dev_create(struct net *net, const char *name, 356 u8 name_assign_type, struct vxlan_config *conf); 357 358 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, 359 netdev_features_t features) 360 { 361 u8 l4_hdr = 0; 362 363 if (!skb->encapsulation) 364 return features; 365 366 switch (vlan_get_protocol(skb)) { 367 case htons(ETH_P_IP): 368 l4_hdr = ip_hdr(skb)->protocol; 369 break; 370 case htons(ETH_P_IPV6): 371 l4_hdr = ipv6_hdr(skb)->nexthdr; 372 break; 373 default: 374 return features; 375 } 376 377 if ((l4_hdr == IPPROTO_UDP) && 378 (skb->inner_protocol_type != ENCAP_TYPE_ETHER || 379 skb->inner_protocol != htons(ETH_P_TEB) || 380 (skb_inner_mac_header(skb) - skb_transport_header(skb) != 381 sizeof(struct udphdr) + sizeof(struct vxlanhdr)) || 382 (skb->ip_summed != CHECKSUM_NONE && 383 !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto)))) 384 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); 385 386 return features; 387 } 388 389 /* IP header + UDP + VXLAN + Ethernet header */ 390 #define VXLAN_HEADROOM (20 + 8 + 8 + 14) 391 /* IPv6 header + UDP + VXLAN + Ethernet header */ 392 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) 393 394 static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb) 395 { 396 return (struct vxlanhdr *)(udp_hdr(skb) + 1); 397 } 398 399 static inline __be32 vxlan_vni(__be32 vni_field) 400 { 401 #if defined(__BIG_ENDIAN) 402 return (__force __be32)((__force u32)vni_field >> 8); 403 #else 404 return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8); 405 #endif 406 } 407 408 static inline __be32 vxlan_vni_field(__be32 vni) 409 { 410 #if defined(__BIG_ENDIAN) 411 return (__force __be32)((__force u32)vni << 8); 412 #else 413 return (__force __be32)((__force u32)vni >> 8); 414 #endif 415 } 416 417 static inline size_t vxlan_rco_start(__be32 vni_field) 418 { 419 return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT; 420 } 421 422 static inline size_t vxlan_rco_offset(__be32 vni_field) 423 { 424 return (vni_field & VXLAN_RCO_UDP) ? 425 offsetof(struct udphdr, check) : 426 offsetof(struct tcphdr, check); 427 } 428 429 static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset) 430 { 431 __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT); 432 433 if (offset == offsetof(struct udphdr, check)) 434 vni_field |= VXLAN_RCO_UDP; 435 return vni_field; 436 } 437 438 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs) 439 { 440 return vs->sock->sk->sk_family; 441 } 442 443 #if IS_ENABLED(CONFIG_IPV6) 444 445 static inline bool vxlan_addr_any(const union vxlan_addr *ipa) 446 { 447 if (ipa->sa.sa_family == AF_INET6) 448 return ipv6_addr_any(&ipa->sin6.sin6_addr); 449 else 450 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); 451 } 452 453 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) 454 { 455 if (ipa->sa.sa_family == AF_INET6) 456 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr); 457 else 458 return ipv4_is_multicast(ipa->sin.sin_addr.s_addr); 459 } 460 461 #else /* !IS_ENABLED(CONFIG_IPV6) */ 462 463 static inline bool vxlan_addr_any(const union vxlan_addr *ipa) 464 { 465 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); 466 } 467 468 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) 469 { 470 return ipv4_is_multicast(ipa->sin.sin_addr.s_addr); 471 } 472 473 #endif /* IS_ENABLED(CONFIG_IPV6) */ 474 475 static inline bool netif_is_vxlan(const struct net_device *dev) 476 { 477 return dev->rtnl_link_ops && 478 !strcmp(dev->rtnl_link_ops->kind, "vxlan"); 479 } 480 481 struct switchdev_notifier_vxlan_fdb_info { 482 struct switchdev_notifier_info info; /* must be first */ 483 union vxlan_addr remote_ip; 484 __be16 remote_port; 485 __be32 remote_vni; 486 u32 remote_ifindex; 487 u8 eth_addr[ETH_ALEN]; 488 __be32 vni; 489 bool offloaded; 490 bool added_by_user; 491 }; 492 493 #if IS_ENABLED(CONFIG_VXLAN) 494 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 495 struct switchdev_notifier_vxlan_fdb_info *fdb_info); 496 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 497 struct notifier_block *nb, 498 struct netlink_ext_ack *extack); 499 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni); 500 501 #else 502 static inline int 503 vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 504 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 505 { 506 return -ENOENT; 507 } 508 509 static inline int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 510 struct notifier_block *nb, 511 struct netlink_ext_ack *extack) 512 { 513 return -EOPNOTSUPP; 514 } 515 516 static inline void 517 vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 518 { 519 } 520 #endif 521 522 static inline void vxlan_flag_attr_error(int attrtype, 523 struct netlink_ext_ack *extack) 524 { 525 #define VXLAN_FLAG(flg) \ 526 case IFLA_VXLAN_##flg: \ 527 NL_SET_ERR_MSG_MOD(extack, \ 528 "cannot change " #flg " flag"); \ 529 break 530 switch (attrtype) { 531 VXLAN_FLAG(TTL_INHERIT); 532 VXLAN_FLAG(LEARNING); 533 VXLAN_FLAG(PROXY); 534 VXLAN_FLAG(RSC); 535 VXLAN_FLAG(L2MISS); 536 VXLAN_FLAG(L3MISS); 537 VXLAN_FLAG(COLLECT_METADATA); 538 VXLAN_FLAG(UDP_ZERO_CSUM6_TX); 539 VXLAN_FLAG(UDP_ZERO_CSUM6_RX); 540 VXLAN_FLAG(REMCSUM_TX); 541 VXLAN_FLAG(REMCSUM_RX); 542 VXLAN_FLAG(GBP); 543 VXLAN_FLAG(GPE); 544 VXLAN_FLAG(REMCSUM_NOPARTIAL); 545 default: 546 NL_SET_ERR_MSG_MOD(extack, \ 547 "cannot change flag"); 548 break; 549 } 550 #undef VXLAN_FLAG 551 } 552 553 static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh, 554 int hash, 555 struct vxlan_rdst *rdst) 556 { 557 struct fib_nh_common *nhc; 558 559 nhc = nexthop_path_fdb_result(nh, hash); 560 if (unlikely(!nhc)) 561 return false; 562 563 switch (nhc->nhc_gw_family) { 564 case AF_INET: 565 rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4; 566 rdst->remote_ip.sa.sa_family = AF_INET; 567 break; 568 case AF_INET6: 569 rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6; 570 rdst->remote_ip.sa.sa_family = AF_INET6; 571 break; 572 } 573 574 return true; 575 } 576 577 static inline void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, const struct vxlan_metadata *md) 578 { 579 struct vxlanhdr_gbp *gbp; 580 581 if (!md->gbp) 582 return; 583 584 gbp = (struct vxlanhdr_gbp *)vxh; 585 vxh->vx_flags |= VXLAN_HF_GBP; 586 587 if (md->gbp & VXLAN_GBP_DONT_LEARN) 588 gbp->dont_learn = 1; 589 590 if (md->gbp & VXLAN_GBP_POLICY_APPLIED) 591 gbp->policy_applied = 1; 592 593 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK); 594 } 595 596 #endif 597