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 11 #define VNI_HASH_BITS 10 12 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 13 14 /* 15 * VXLAN Group Based Policy Extension: 16 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 17 * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R| Group Policy ID | 18 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 19 * | VXLAN Network Identifier (VNI) | Reserved | 20 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21 * 22 * D = Don't Learn bit. When set, this bit indicates that the egress 23 * VTEP MUST NOT learn the source address of the encapsulated frame. 24 * 25 * A = Indicates that the group policy has already been applied to 26 * this packet. Policies MUST NOT be applied by devices when the 27 * A bit is set. 28 * 29 * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy 30 */ 31 struct vxlanhdr_gbp { 32 __u8 vx_flags; 33 #ifdef __LITTLE_ENDIAN_BITFIELD 34 __u8 reserved_flags1:3, 35 policy_applied:1, 36 reserved_flags2:2, 37 dont_learn:1, 38 reserved_flags3:1; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 __u8 reserved_flags1:1, 41 dont_learn:1, 42 reserved_flags2:2, 43 policy_applied:1, 44 reserved_flags3:3; 45 #else 46 #error "Please fix <asm/byteorder.h>" 47 #endif 48 __be16 policy_id; 49 __be32 vx_vni; 50 }; 51 52 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) 53 54 /* skb->mark mapping 55 * 56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 57 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | 58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 59 */ 60 #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) 61 #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) 62 #define VXLAN_GBP_ID_MASK (0xFFFF) 63 64 /* VXLAN protocol header: 65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 66 * |G|R|R|R|I|R|R|C| Reserved | 67 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 68 * | VXLAN Network Identifier (VNI) | Reserved | 69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 70 * 71 * G = 1 Group Policy (VXLAN-GBP) 72 * I = 1 VXLAN Network Identifier (VNI) present 73 * C = 1 Remote checksum offload (RCO) 74 */ 75 struct vxlanhdr { 76 __be32 vx_flags; 77 __be32 vx_vni; 78 }; 79 80 /* VXLAN header flags. */ 81 #define VXLAN_HF_RCO BIT(24) 82 #define VXLAN_HF_VNI BIT(27) 83 #define VXLAN_HF_GBP BIT(31) 84 85 /* Remote checksum offload header option */ 86 #define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */ 87 #define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */ 88 #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ 89 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) 90 #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) 91 92 #define VXLAN_N_VID (1u << 24) 93 #define VXLAN_VID_MASK (VXLAN_N_VID - 1) 94 #define VXLAN_VNI_MASK (VXLAN_VID_MASK << 8) 95 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) 96 97 struct vxlan_metadata { 98 __be32 vni; 99 u32 gbp; 100 }; 101 102 struct vxlan_sock; 103 typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, 104 struct vxlan_metadata *md); 105 106 /* per UDP socket information */ 107 struct vxlan_sock { 108 struct hlist_node hlist; 109 vxlan_rcv_t *rcv; 110 void *data; 111 struct work_struct del_work; 112 struct socket *sock; 113 struct rcu_head rcu; 114 struct hlist_head vni_list[VNI_HASH_SIZE]; 115 atomic_t refcnt; 116 struct udp_offload udp_offloads; 117 u32 flags; 118 }; 119 120 #define VXLAN_F_LEARN 0x01 121 #define VXLAN_F_PROXY 0x02 122 #define VXLAN_F_RSC 0x04 123 #define VXLAN_F_L2MISS 0x08 124 #define VXLAN_F_L3MISS 0x10 125 #define VXLAN_F_IPV6 0x20 126 #define VXLAN_F_UDP_CSUM 0x40 127 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 128 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 129 #define VXLAN_F_REMCSUM_TX 0x200 130 #define VXLAN_F_REMCSUM_RX 0x400 131 #define VXLAN_F_GBP 0x800 132 #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 133 134 /* Flags that are used in the receive path. These flags must match in 135 * order for a socket to be shareable 136 */ 137 #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ 138 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 139 VXLAN_F_REMCSUM_RX | \ 140 VXLAN_F_REMCSUM_NOPARTIAL) 141 142 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port, 143 vxlan_rcv_t *rcv, void *data, 144 bool no_share, u32 flags); 145 146 void vxlan_sock_release(struct vxlan_sock *vs); 147 148 int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb, 149 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, 150 __be16 src_port, __be16 dst_port, struct vxlan_metadata *md, 151 bool xnet, u32 vxflags); 152 153 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, 154 netdev_features_t features) 155 { 156 u8 l4_hdr = 0; 157 158 if (!skb->encapsulation) 159 return features; 160 161 switch (vlan_get_protocol(skb)) { 162 case htons(ETH_P_IP): 163 l4_hdr = ip_hdr(skb)->protocol; 164 break; 165 case htons(ETH_P_IPV6): 166 l4_hdr = ipv6_hdr(skb)->nexthdr; 167 break; 168 default: 169 return features;; 170 } 171 172 if ((l4_hdr == IPPROTO_UDP) && 173 (skb->inner_protocol_type != ENCAP_TYPE_ETHER || 174 skb->inner_protocol != htons(ETH_P_TEB) || 175 (skb_inner_mac_header(skb) - skb_transport_header(skb) != 176 sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) 177 return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK); 178 179 return features; 180 } 181 182 /* IP header + UDP + VXLAN + Ethernet header */ 183 #define VXLAN_HEADROOM (20 + 8 + 8 + 14) 184 /* IPv6 header + UDP + VXLAN + Ethernet header */ 185 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) 186 187 #if IS_ENABLED(CONFIG_VXLAN) 188 void vxlan_get_rx_port(struct net_device *netdev); 189 #else 190 static inline void vxlan_get_rx_port(struct net_device *netdev) 191 { 192 } 193 #endif 194 #endif 195