| #ifndef __NET_VXLAN_H |
| #define __NET_VXLAN_H 1 |
| |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/if_vlan.h> |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/udp.h> |
| |
| #define VNI_HASH_BITS 10 |
| #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
| |
| /* |
| * VXLAN Group Based Policy Extension: |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R| Group Policy ID | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | VXLAN Network Identifier (VNI) | Reserved | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * D = Don't Learn bit. When set, this bit indicates that the egress |
| * VTEP MUST NOT learn the source address of the encapsulated frame. |
| * |
| * A = Indicates that the group policy has already been applied to |
| * this packet. Policies MUST NOT be applied by devices when the |
| * A bit is set. |
| * |
| * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy |
| */ |
| struct vxlanhdr_gbp { |
| __u8 vx_flags; |
| #ifdef __LITTLE_ENDIAN_BITFIELD |
| __u8 reserved_flags1:3, |
| policy_applied:1, |
| reserved_flags2:2, |
| dont_learn:1, |
| reserved_flags3:1; |
| #elif defined(__BIG_ENDIAN_BITFIELD) |
| __u8 reserved_flags1:1, |
| dont_learn:1, |
| reserved_flags2:2, |
| policy_applied:1, |
| reserved_flags3:3; |
| #else |
| #error "Please fix <asm/byteorder.h>" |
| #endif |
| __be16 policy_id; |
| __be32 vx_vni; |
| }; |
| |
| #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) |
| |
| /* skb->mark mapping |
| * |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) |
| #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) |
| #define VXLAN_GBP_ID_MASK (0xFFFF) |
| |
| /* VXLAN protocol header: |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |G|R|R|R|I|R|R|C| Reserved | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | VXLAN Network Identifier (VNI) | Reserved | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * G = 1 Group Policy (VXLAN-GBP) |
| * I = 1 VXLAN Network Identifier (VNI) present |
| * C = 1 Remote checksum offload (RCO) |
| */ |
| struct vxlanhdr { |
| __be32 vx_flags; |
| __be32 vx_vni; |
| }; |
| |
| /* VXLAN header flags. */ |
| #define VXLAN_HF_RCO BIT(24) |
| #define VXLAN_HF_VNI BIT(27) |
| #define VXLAN_HF_GBP BIT(31) |
| |
| /* Remote checksum offload header option */ |
| #define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */ |
| #define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */ |
| #define VXLAN_RCO_SHIFT 1 /* Left shift of start */ |
| #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) |
| #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) |
| |
| #define VXLAN_N_VID (1u << 24) |
| #define VXLAN_VID_MASK (VXLAN_N_VID - 1) |
| #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) |
| |
| struct vxlan_metadata { |
| __be32 vni; |
| u32 gbp; |
| }; |
| |
| struct vxlan_sock; |
| typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, |
| struct vxlan_metadata *md); |
| |
| /* per UDP socket information */ |
| struct vxlan_sock { |
| struct hlist_node hlist; |
| vxlan_rcv_t *rcv; |
| void *data; |
| struct work_struct del_work; |
| struct socket *sock; |
| struct rcu_head rcu; |
| struct hlist_head vni_list[VNI_HASH_SIZE]; |
| atomic_t refcnt; |
| struct udp_offload udp_offloads; |
| u32 flags; |
| }; |
| |
| #define VXLAN_F_LEARN 0x01 |
| #define VXLAN_F_PROXY 0x02 |
| #define VXLAN_F_RSC 0x04 |
| #define VXLAN_F_L2MISS 0x08 |
| #define VXLAN_F_L3MISS 0x10 |
| #define VXLAN_F_IPV6 0x20 |
| #define VXLAN_F_UDP_CSUM 0x40 |
| #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 |
| #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 |
| #define VXLAN_F_REMCSUM_TX 0x200 |
| #define VXLAN_F_REMCSUM_RX 0x400 |
| #define VXLAN_F_GBP 0x800 |
| #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 |
| |
| /* Flags that are used in the receive path. These flags must match in |
| * order for a socket to be shareable |
| */ |
| #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ |
| VXLAN_F_UDP_ZERO_CSUM6_RX | \ |
| VXLAN_F_REMCSUM_RX | \ |
| VXLAN_F_REMCSUM_NOPARTIAL) |
| |
| struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port, |
| vxlan_rcv_t *rcv, void *data, |
| bool no_share, u32 flags); |
| |
| void vxlan_sock_release(struct vxlan_sock *vs); |
| |
| int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb, |
| __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, |
| __be16 src_port, __be16 dst_port, struct vxlan_metadata *md, |
| bool xnet, u32 vxflags); |
| |
| static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, |
| netdev_features_t features) |
| { |
| u8 l4_hdr = 0; |
| |
| if (!skb->encapsulation) |
| return features; |
| |
| switch (vlan_get_protocol(skb)) { |
| case htons(ETH_P_IP): |
| l4_hdr = ip_hdr(skb)->protocol; |
| break; |
| case htons(ETH_P_IPV6): |
| l4_hdr = ipv6_hdr(skb)->nexthdr; |
| break; |
| default: |
| return features;; |
| } |
| |
| if ((l4_hdr == IPPROTO_UDP) && |
| (skb->inner_protocol_type != ENCAP_TYPE_ETHER || |
| skb->inner_protocol != htons(ETH_P_TEB) || |
| (skb_inner_mac_header(skb) - skb_transport_header(skb) != |
| sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) |
| return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK); |
| |
| return features; |
| } |
| |
| /* IP header + UDP + VXLAN + Ethernet header */ |
| #define VXLAN_HEADROOM (20 + 8 + 8 + 14) |
| /* IPv6 header + UDP + VXLAN + Ethernet header */ |
| #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) |
| |
| #if IS_ENABLED(CONFIG_VXLAN) |
| void vxlan_get_rx_port(struct net_device *netdev); |
| #else |
| static inline void vxlan_get_rx_port(struct net_device *netdev) |
| { |
| } |
| #endif |
| #endif |