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 #define VNI_HASH_BITS 10 13 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 14 15 /* 16 * VXLAN Group Based Policy Extension: 17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 18 * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R| Group Policy ID | 19 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 20 * | VXLAN Network Identifier (VNI) | Reserved | 21 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22 * 23 * D = Don't Learn bit. When set, this bit indicates that the egress 24 * VTEP MUST NOT learn the source address of the encapsulated frame. 25 * 26 * A = Indicates that the group policy has already been applied to 27 * this packet. Policies MUST NOT be applied by devices when the 28 * A bit is set. 29 * 30 * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy 31 */ 32 struct vxlanhdr_gbp { 33 __u8 vx_flags; 34 #ifdef __LITTLE_ENDIAN_BITFIELD 35 __u8 reserved_flags1:3, 36 policy_applied:1, 37 reserved_flags2:2, 38 dont_learn:1, 39 reserved_flags3:1; 40 #elif defined(__BIG_ENDIAN_BITFIELD) 41 __u8 reserved_flags1:1, 42 dont_learn:1, 43 reserved_flags2:2, 44 policy_applied:1, 45 reserved_flags3:3; 46 #else 47 #error "Please fix <asm/byteorder.h>" 48 #endif 49 __be16 policy_id; 50 __be32 vx_vni; 51 }; 52 53 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) 54 55 /* skb->mark mapping 56 * 57 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 58 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | 59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 60 */ 61 #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) 62 #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) 63 #define VXLAN_GBP_ID_MASK (0xFFFF) 64 65 /* VXLAN protocol header: 66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 67 * |G|R|R|R|I|R|R|C| Reserved | 68 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 69 * | VXLAN Network Identifier (VNI) | Reserved | 70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 71 * 72 * G = 1 Group Policy (VXLAN-GBP) 73 * I = 1 VXLAN Network Identifier (VNI) present 74 * C = 1 Remote checksum offload (RCO) 75 */ 76 struct vxlanhdr { 77 __be32 vx_flags; 78 __be32 vx_vni; 79 }; 80 81 /* VXLAN header flags. */ 82 #define VXLAN_HF_RCO BIT(21) 83 #define VXLAN_HF_VNI BIT(27) 84 #define VXLAN_HF_GBP BIT(31) 85 86 /* Remote checksum offload header option */ 87 #define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */ 88 #define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */ 89 #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ 90 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) 91 #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) 92 93 #define VXLAN_N_VID (1u << 24) 94 #define VXLAN_VID_MASK (VXLAN_N_VID - 1) 95 #define VXLAN_VNI_MASK (VXLAN_VID_MASK << 8) 96 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) 97 98 #define VNI_HASH_BITS 10 99 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 100 #define FDB_HASH_BITS 8 101 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) 102 103 struct vxlan_metadata { 104 u32 gbp; 105 }; 106 107 /* per UDP socket information */ 108 struct vxlan_sock { 109 struct hlist_node hlist; 110 struct work_struct del_work; 111 struct socket *sock; 112 struct rcu_head rcu; 113 struct hlist_head vni_list[VNI_HASH_SIZE]; 114 atomic_t refcnt; 115 struct udp_offload udp_offloads; 116 u32 flags; 117 }; 118 119 union vxlan_addr { 120 struct sockaddr_in sin; 121 struct sockaddr_in6 sin6; 122 struct sockaddr sa; 123 }; 124 125 struct vxlan_rdst { 126 union vxlan_addr remote_ip; 127 __be16 remote_port; 128 u32 remote_vni; 129 u32 remote_ifindex; 130 struct list_head list; 131 struct rcu_head rcu; 132 }; 133 134 struct vxlan_config { 135 union vxlan_addr remote_ip; 136 union vxlan_addr saddr; 137 u32 vni; 138 int remote_ifindex; 139 int mtu; 140 __be16 dst_port; 141 __u16 port_min; 142 __u16 port_max; 143 __u8 tos; 144 __u8 ttl; 145 u32 flags; 146 unsigned long age_interval; 147 unsigned int addrmax; 148 bool no_share; 149 }; 150 151 /* Pseudo network device */ 152 struct vxlan_dev { 153 struct hlist_node hlist; /* vni hash table */ 154 struct list_head next; /* vxlan's per namespace list */ 155 struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */ 156 #if IS_ENABLED(CONFIG_IPV6) 157 struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */ 158 #endif 159 struct net_device *dev; 160 struct net *net; /* netns for packet i/o */ 161 struct vxlan_rdst default_dst; /* default destination */ 162 u32 flags; /* VXLAN_F_* in vxlan.h */ 163 164 struct timer_list age_timer; 165 spinlock_t hash_lock; 166 unsigned int addrcnt; 167 struct gro_cells gro_cells; 168 169 struct vxlan_config cfg; 170 171 struct hlist_head fdb_head[FDB_HASH_SIZE]; 172 }; 173 174 #define VXLAN_F_LEARN 0x01 175 #define VXLAN_F_PROXY 0x02 176 #define VXLAN_F_RSC 0x04 177 #define VXLAN_F_L2MISS 0x08 178 #define VXLAN_F_L3MISS 0x10 179 #define VXLAN_F_IPV6 0x20 180 #define VXLAN_F_UDP_CSUM 0x40 181 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 182 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 183 #define VXLAN_F_REMCSUM_TX 0x200 184 #define VXLAN_F_REMCSUM_RX 0x400 185 #define VXLAN_F_GBP 0x800 186 #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 187 #define VXLAN_F_COLLECT_METADATA 0x2000 188 189 /* Flags that are used in the receive path. These flags must match in 190 * order for a socket to be shareable 191 */ 192 #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ 193 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 194 VXLAN_F_REMCSUM_RX | \ 195 VXLAN_F_REMCSUM_NOPARTIAL | \ 196 VXLAN_F_COLLECT_METADATA) 197 198 struct net_device *vxlan_dev_create(struct net *net, const char *name, 199 u8 name_assign_type, struct vxlan_config *conf); 200 201 static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan, 202 unsigned short family) 203 { 204 #if IS_ENABLED(CONFIG_IPV6) 205 if (family == AF_INET6) 206 return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport; 207 #endif 208 return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport; 209 } 210 211 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, 212 netdev_features_t features) 213 { 214 u8 l4_hdr = 0; 215 216 if (!skb->encapsulation) 217 return features; 218 219 switch (vlan_get_protocol(skb)) { 220 case htons(ETH_P_IP): 221 l4_hdr = ip_hdr(skb)->protocol; 222 break; 223 case htons(ETH_P_IPV6): 224 l4_hdr = ipv6_hdr(skb)->nexthdr; 225 break; 226 default: 227 return features;; 228 } 229 230 if ((l4_hdr == IPPROTO_UDP) && 231 (skb->inner_protocol_type != ENCAP_TYPE_ETHER || 232 skb->inner_protocol != htons(ETH_P_TEB) || 233 (skb_inner_mac_header(skb) - skb_transport_header(skb) != 234 sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) 235 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); 236 237 return features; 238 } 239 240 /* IP header + UDP + VXLAN + Ethernet header */ 241 #define VXLAN_HEADROOM (20 + 8 + 8 + 14) 242 /* IPv6 header + UDP + VXLAN + Ethernet header */ 243 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) 244 245 #if IS_ENABLED(CONFIG_VXLAN) 246 void vxlan_get_rx_port(struct net_device *netdev); 247 #else 248 static inline void vxlan_get_rx_port(struct net_device *netdev) 249 { 250 } 251 #endif 252 253 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs) 254 { 255 return vs->sock->sk->sk_family; 256 } 257 258 #endif 259