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#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
/* Flags that are used in the receive patch. 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)
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
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