diff options
Diffstat (limited to 'kernel/include/net/vxlan.h')
| -rw-r--r-- | kernel/include/net/vxlan.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/kernel/include/net/vxlan.h b/kernel/include/net/vxlan.h new file mode 100644 index 000000000..0082b5d33 --- /dev/null +++ b/kernel/include/net/vxlan.h @@ -0,0 +1,194 @@ +#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_VNI_MASK (VXLAN_VID_MASK << 8) +#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 sock *sk, 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 |