1 #ifndef __NET_VXLAN_H 2 #define __NET_VXLAN_H 1 3 4 #include <linux/ip.h> 5 #include <linux/ipv6.h> 6 #include <linux/if_vlan.h> 7 #include <linux/skbuff.h> 8 #include <linux/netdevice.h> 9 #include <linux/udp.h> 10 #include <net/dst_metadata.h> 11 12 /* VXLAN protocol (RFC 7348) header: 13 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 14 * |R|R|R|R|I|R|R|R| Reserved | 15 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 16 * | VXLAN Network Identifier (VNI) | Reserved | 17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 18 * 19 * I = VXLAN Network Identifier (VNI) present. 20 */ 21 struct vxlanhdr { 22 __be32 vx_flags; 23 __be32 vx_vni; 24 }; 25 26 /* VXLAN header flags. */ 27 #define VXLAN_HF_VNI cpu_to_be32(BIT(27)) 28 29 #define VXLAN_N_VID (1u << 24) 30 #define VXLAN_VID_MASK (VXLAN_N_VID - 1) 31 #define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8) 32 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) 33 34 #define VNI_HASH_BITS 10 35 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 36 #define FDB_HASH_BITS 8 37 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) 38 39 /* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X): 40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 41 * |R|R|R|R|I|R|R|R|R|R|C| Reserved | 42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 43 * | VXLAN Network Identifier (VNI) |O| Csum start | 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * 46 * C = Remote checksum offload bit. When set indicates that the 47 * remote checksum offload data is present. 48 * 49 * O = Offset bit. Indicates the checksum offset relative to 50 * checksum start. 51 * 52 * Csum start = Checksum start divided by two. 53 * 54 * http://tools.ietf.org/html/draft-herbert-vxlan-rco 55 */ 56 57 /* VXLAN-RCO header flags. */ 58 #define VXLAN_HF_RCO cpu_to_be32(BIT(21)) 59 60 /* Remote checksum offload header option */ 61 #define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */ 62 #define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */ 63 #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ 64 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) 65 #define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT) 66 67 /* 68 * VXLAN Group Based Policy Extension (VXLAN_F_GBP): 69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 70 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | 71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 72 * | VXLAN Network Identifier (VNI) | Reserved | 73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 74 * 75 * G = Group Policy ID present. 76 * 77 * D = Don't Learn bit. When set, this bit indicates that the egress 78 * VTEP MUST NOT learn the source address of the encapsulated frame. 79 * 80 * A = Indicates that the group policy has already been applied to 81 * this packet. Policies MUST NOT be applied by devices when the 82 * A bit is set. 83 * 84 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy 85 */ 86 struct vxlanhdr_gbp { 87 u8 vx_flags; 88 #ifdef __LITTLE_ENDIAN_BITFIELD 89 u8 reserved_flags1:3, 90 policy_applied:1, 91 reserved_flags2:2, 92 dont_learn:1, 93 reserved_flags3:1; 94 #elif defined(__BIG_ENDIAN_BITFIELD) 95 u8 reserved_flags1:1, 96 dont_learn:1, 97 reserved_flags2:2, 98 policy_applied:1, 99 reserved_flags3:3; 100 #else 101 #error "Please fix <asm/byteorder.h>" 102 #endif 103 __be16 policy_id; 104 __be32 vx_vni; 105 }; 106 107 /* VXLAN-GBP header flags. */ 108 #define VXLAN_HF_GBP cpu_to_be32(BIT(31)) 109 110 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF)) 111 112 /* skb->mark mapping 113 * 114 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 115 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | 116 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 117 */ 118 #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) 119 #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) 120 #define VXLAN_GBP_ID_MASK (0xFFFF) 121 122 /* 123 * VXLAN Generic Protocol Extension (VXLAN_F_GPE): 124 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 125 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol | 126 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 127 * | VXLAN Network Identifier (VNI) | Reserved | 128 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 129 * 130 * Ver = Version. Indicates VXLAN GPE protocol version. 131 * 132 * P = Next Protocol Bit. The P bit is set to indicate that the 133 * Next Protocol field is present. 134 * 135 * O = OAM Flag Bit. The O bit is set to indicate that the packet 136 * is an OAM packet. 137 * 138 * Next Protocol = This 8 bit field indicates the protocol header 139 * immediately following the VXLAN GPE header. 140 * 141 * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01 142 */ 143 144 struct vxlanhdr_gpe { 145 #if defined(__LITTLE_ENDIAN_BITFIELD) 146 u8 oam_flag:1, 147 reserved_flags1:1, 148 np_applied:1, 149 instance_applied:1, 150 version:2, 151 reserved_flags2:2; 152 #elif defined(__BIG_ENDIAN_BITFIELD) 153 u8 reserved_flags2:2, 154 version:2, 155 instance_applied:1, 156 np_applied:1, 157 reserved_flags1:1, 158 oam_flag:1; 159 #endif 160 u8 reserved_flags3; 161 u8 reserved_flags4; 162 u8 next_protocol; 163 __be32 vx_vni; 164 }; 165 166 /* VXLAN-GPE header flags. */ 167 #define VXLAN_HF_VER cpu_to_be32(BIT(29) | BIT(28)) 168 #define VXLAN_HF_NP cpu_to_be32(BIT(26)) 169 #define VXLAN_HF_OAM cpu_to_be32(BIT(24)) 170 171 #define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \ 172 cpu_to_be32(0xff)) 173 174 /* VXLAN-GPE header Next Protocol. */ 175 #define VXLAN_GPE_NP_IPV4 0x01 176 #define VXLAN_GPE_NP_IPV6 0x02 177 #define VXLAN_GPE_NP_ETHERNET 0x03 178 #define VXLAN_GPE_NP_NSH 0x04 179 180 struct vxlan_metadata { 181 u32 gbp; 182 }; 183 184 /* per UDP socket information */ 185 struct vxlan_sock { 186 struct hlist_node hlist; 187 struct socket *sock; 188 struct hlist_head vni_list[VNI_HASH_SIZE]; 189 atomic_t refcnt; 190 u32 flags; 191 }; 192 193 union vxlan_addr { 194 struct sockaddr_in sin; 195 struct sockaddr_in6 sin6; 196 struct sockaddr sa; 197 }; 198 199 struct vxlan_rdst { 200 union vxlan_addr remote_ip; 201 __be16 remote_port; 202 __be32 remote_vni; 203 u32 remote_ifindex; 204 struct list_head list; 205 struct rcu_head rcu; 206 struct dst_cache dst_cache; 207 }; 208 209 struct vxlan_config { 210 union vxlan_addr remote_ip; 211 union vxlan_addr saddr; 212 __be32 vni; 213 int remote_ifindex; 214 int mtu; 215 __be16 dst_port; 216 u16 port_min; 217 u16 port_max; 218 u8 tos; 219 u8 ttl; 220 __be32 label; 221 u32 flags; 222 unsigned long age_interval; 223 unsigned int addrmax; 224 bool no_share; 225 }; 226 227 /* Pseudo network device */ 228 struct vxlan_dev { 229 struct hlist_node hlist; /* vni hash table */ 230 struct list_head next; /* vxlan's per namespace list */ 231 struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */ 232 #if IS_ENABLED(CONFIG_IPV6) 233 struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */ 234 #endif 235 struct net_device *dev; 236 struct net *net; /* netns for packet i/o */ 237 struct vxlan_rdst default_dst; /* default destination */ 238 u32 flags; /* VXLAN_F_* in vxlan.h */ 239 240 struct timer_list age_timer; 241 spinlock_t hash_lock; 242 unsigned int addrcnt; 243 struct gro_cells gro_cells; 244 245 struct vxlan_config cfg; 246 247 struct hlist_head fdb_head[FDB_HASH_SIZE]; 248 }; 249 250 #define VXLAN_F_LEARN 0x01 251 #define VXLAN_F_PROXY 0x02 252 #define VXLAN_F_RSC 0x04 253 #define VXLAN_F_L2MISS 0x08 254 #define VXLAN_F_L3MISS 0x10 255 #define VXLAN_F_IPV6 0x20 256 #define VXLAN_F_UDP_ZERO_CSUM_TX 0x40 257 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 258 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 259 #define VXLAN_F_REMCSUM_TX 0x200 260 #define VXLAN_F_REMCSUM_RX 0x400 261 #define VXLAN_F_GBP 0x800 262 #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 263 #define VXLAN_F_COLLECT_METADATA 0x2000 264 #define VXLAN_F_GPE 0x4000 265 266 /* Flags that are used in the receive path. These flags must match in 267 * order for a socket to be shareable 268 */ 269 #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ 270 VXLAN_F_GPE | \ 271 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 272 VXLAN_F_REMCSUM_RX | \ 273 VXLAN_F_REMCSUM_NOPARTIAL | \ 274 VXLAN_F_COLLECT_METADATA) 275 276 /* Flags that can be set together with VXLAN_F_GPE. */ 277 #define VXLAN_F_ALLOWED_GPE (VXLAN_F_GPE | \ 278 VXLAN_F_IPV6 | \ 279 VXLAN_F_UDP_ZERO_CSUM_TX | \ 280 VXLAN_F_UDP_ZERO_CSUM6_TX | \ 281 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 282 VXLAN_F_COLLECT_METADATA) 283 284 struct net_device *vxlan_dev_create(struct net *net, const char *name, 285 u8 name_assign_type, struct vxlan_config *conf); 286 287 static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan, 288 unsigned short family) 289 { 290 #if IS_ENABLED(CONFIG_IPV6) 291 if (family == AF_INET6) 292 return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport; 293 #endif 294 return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport; 295 } 296 297 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, 298 netdev_features_t features) 299 { 300 u8 l4_hdr = 0; 301 302 if (!skb->encapsulation) 303 return features; 304 305 switch (vlan_get_protocol(skb)) { 306 case htons(ETH_P_IP): 307 l4_hdr = ip_hdr(skb)->protocol; 308 break; 309 case htons(ETH_P_IPV6): 310 l4_hdr = ipv6_hdr(skb)->nexthdr; 311 break; 312 default: 313 return features;; 314 } 315 316 if ((l4_hdr == IPPROTO_UDP) && 317 (skb->inner_protocol_type != ENCAP_TYPE_ETHER || 318 skb->inner_protocol != htons(ETH_P_TEB) || 319 (skb_inner_mac_header(skb) - skb_transport_header(skb) != 320 sizeof(struct udphdr) + sizeof(struct vxlanhdr)) || 321 (skb->ip_summed != CHECKSUM_NONE && 322 !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto)))) 323 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); 324 325 return features; 326 } 327 328 /* IP header + UDP + VXLAN + Ethernet header */ 329 #define VXLAN_HEADROOM (20 + 8 + 8 + 14) 330 /* IPv6 header + UDP + VXLAN + Ethernet header */ 331 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) 332 333 static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb) 334 { 335 return (struct vxlanhdr *)(udp_hdr(skb) + 1); 336 } 337 338 static inline __be32 vxlan_vni(__be32 vni_field) 339 { 340 #if defined(__BIG_ENDIAN) 341 return (__force __be32)((__force u32)vni_field >> 8); 342 #else 343 return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8); 344 #endif 345 } 346 347 static inline __be32 vxlan_vni_field(__be32 vni) 348 { 349 #if defined(__BIG_ENDIAN) 350 return (__force __be32)((__force u32)vni << 8); 351 #else 352 return (__force __be32)((__force u32)vni >> 8); 353 #endif 354 } 355 356 static inline __be32 vxlan_tun_id_to_vni(__be64 tun_id) 357 { 358 #if defined(__BIG_ENDIAN) 359 return (__force __be32)tun_id; 360 #else 361 return (__force __be32)((__force u64)tun_id >> 32); 362 #endif 363 } 364 365 static inline __be64 vxlan_vni_to_tun_id(__be32 vni) 366 { 367 #if defined(__BIG_ENDIAN) 368 return (__force __be64)vni; 369 #else 370 return (__force __be64)((u64)(__force u32)vni << 32); 371 #endif 372 } 373 374 static inline size_t vxlan_rco_start(__be32 vni_field) 375 { 376 return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT; 377 } 378 379 static inline size_t vxlan_rco_offset(__be32 vni_field) 380 { 381 return (vni_field & VXLAN_RCO_UDP) ? 382 offsetof(struct udphdr, check) : 383 offsetof(struct tcphdr, check); 384 } 385 386 static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset) 387 { 388 __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT); 389 390 if (offset == offsetof(struct udphdr, check)) 391 vni_field |= VXLAN_RCO_UDP; 392 return vni_field; 393 } 394 395 static inline void vxlan_get_rx_port(struct net_device *netdev) 396 { 397 ASSERT_RTNL(); 398 call_netdevice_notifiers(NETDEV_OFFLOAD_PUSH_VXLAN, netdev); 399 } 400 401 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs) 402 { 403 return vs->sock->sk->sk_family; 404 } 405 406 #endif 407