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