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_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) 95 96 struct vxlan_metadata { 97 __be32 vni; 98 u32 gbp; 99 }; 100 101 struct vxlan_sock; 102 typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, 103 struct vxlan_metadata *md); 104 105 /* per UDP socket information */ 106 struct vxlan_sock { 107 struct hlist_node hlist; 108 vxlan_rcv_t *rcv; 109 void *data; 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 #define VXLAN_F_LEARN 0x01 120 #define VXLAN_F_PROXY 0x02 121 #define VXLAN_F_RSC 0x04 122 #define VXLAN_F_L2MISS 0x08 123 #define VXLAN_F_L3MISS 0x10 124 #define VXLAN_F_IPV6 0x20 125 #define VXLAN_F_UDP_CSUM 0x40 126 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 127 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 128 #define VXLAN_F_REMCSUM_TX 0x200 129 #define VXLAN_F_REMCSUM_RX 0x400 130 #define VXLAN_F_GBP 0x800 131 #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 132 133 /* Flags that are used in the receive patch. These flags must match in 134 * order for a socket to be shareable 135 */ 136 #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ 137 VXLAN_F_UDP_ZERO_CSUM6_RX | \ 138 VXLAN_F_REMCSUM_RX | \ 139 VXLAN_F_REMCSUM_NOPARTIAL) 140 141 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port, 142 vxlan_rcv_t *rcv, void *data, 143 bool no_share, u32 flags); 144 145 void vxlan_sock_release(struct vxlan_sock *vs); 146 147 int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb, 148 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, 149 __be16 src_port, __be16 dst_port, struct vxlan_metadata *md, 150 bool xnet, u32 vxflags); 151 152 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, 153 netdev_features_t features) 154 { 155 u8 l4_hdr = 0; 156 157 if (!skb->encapsulation) 158 return features; 159 160 switch (vlan_get_protocol(skb)) { 161 case htons(ETH_P_IP): 162 l4_hdr = ip_hdr(skb)->protocol; 163 break; 164 case htons(ETH_P_IPV6): 165 l4_hdr = ipv6_hdr(skb)->nexthdr; 166 break; 167 default: 168 return features;; 169 } 170 171 if ((l4_hdr == IPPROTO_UDP) && 172 (skb->inner_protocol_type != ENCAP_TYPE_ETHER || 173 skb->inner_protocol != htons(ETH_P_TEB) || 174 (skb_inner_mac_header(skb) - skb_transport_header(skb) != 175 sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) 176 return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK); 177 178 return features; 179 } 180 181 /* IP header + UDP + VXLAN + Ethernet header */ 182 #define VXLAN_HEADROOM (20 + 8 + 8 + 14) 183 /* IPv6 header + UDP + VXLAN + Ethernet header */ 184 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) 185 186 #if IS_ENABLED(CONFIG_VXLAN) 187 void vxlan_get_rx_port(struct net_device *netdev); 188 #else 189 static inline void vxlan_get_rx_port(struct net_device *netdev) 190 { 191 } 192 #endif 193 #endif 194