[linux.git] / include / net / vxlan.h

#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 protocol header */
struct vxlanhdr {
	__be32 vx_flags;
	__be32 vx_vni;
};

/* VXLAN header flags. */
#define VXLAN_HF_VNI 0x08000000
#define VXLAN_HF_RCO 0x00200000

/* 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_sock;
typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, __be32 key);

/* 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

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 vxlan_sock *vs,
		   struct rtable *rt, struct sk_buff *skb,
		   __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
		   __be16 src_port, __be16 dst_port, __be32 vni, bool xnet);

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
Commit	Line	Data
012a5729 PS	1	#ifndef __NET_VXLAN_H
	2	#define __NET_VXLAN_H 1
	3
5f35227e JG	4	#include <linux/ip.h>
	5	#include <linux/ipv6.h>
	6	#include <linux/if_vlan.h>
012a5729 PS	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
11bf7828 JS	14	/* VXLAN protocol header */
	15	struct vxlanhdr {
	16	__be32 vx_flags;
	17	__be32 vx_vni;
	18	};
	19
3bf39475 TH	20	/* VXLAN header flags. */
3bf39475 TH	21	#define VXLAN_HF_VNI 0x08000000
dfd8645e TH	22	#define VXLAN_HF_RCO 0x00200000
	23
	24	/* Remote checksum offload header option */
	25	#define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */
	26	#define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set ) /
	27	#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
	28	#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
	29	#define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT)
3bf39475 TH	30
	31	#define VXLAN_N_VID (1u << 24)
	32	#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
	33	#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
	34
012a5729 PS	35	struct vxlan_sock;
	36	typedef void (vxlan_rcv_t)(struct vxlan_sock vh, struct sk_buff skb, __be32 key);
	37
	38	/* per UDP socket information */
	39	struct vxlan_sock {
	40	struct hlist_node hlist;
	41	vxlan_rcv_t *rcv;
	42	void *data;
	43	struct work_struct del_work;
	44	struct socket *sock;
	45	struct rcu_head rcu;
	46	struct hlist_head vni_list[VNI_HASH_SIZE];
	47	atomic_t refcnt;
dc01e7d3	48	struct udp_offload udp_offloads;
dfd8645e	49	u32 flags;
012a5729 PS	50	};
012a5729 PS	51
359a0ea9 TH	52	#define VXLAN_F_LEARN 0x01
	53	#define VXLAN_F_PROXY 0x02
	54	#define VXLAN_F_RSC 0x04
	55	#define VXLAN_F_L2MISS 0x08
	56	#define VXLAN_F_L3MISS 0x10
	57	#define VXLAN_F_IPV6 0x20
	58	#define VXLAN_F_UDP_CSUM 0x40
	59	#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
	60	#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
dfd8645e TH	61	#define VXLAN_F_REMCSUM_TX 0x200
dfd8645e TH	62	#define VXLAN_F_REMCSUM_RX 0x400
359a0ea9	63
012a5729 PS	64	struct vxlan_sock vxlan_sock_add(struct net net, __be16 port,
012a5729 PS	65	vxlan_rcv_t rcv, void data,
359a0ea9	66	bool no_share, u32 flags);
012a5729 PS	67
012a5729 PS	68	void vxlan_sock_release(struct vxlan_sock *vs);
49560532	69
11796187	70	int vxlan_xmit_skb(struct vxlan_sock *vs,
49560532 PS	71	struct rtable rt, struct sk_buff skb,
49560532 PS	72	__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
f01ec1c0	73	__be16 src_port, __be16 dst_port, __be32 vni, bool xnet);
49560532	74
5f35227e JG	75	static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
5f35227e JG	76	netdev_features_t features)
11bf7828	77	{
5f35227e JG	78	u8 l4_hdr = 0;
	79
	80	if (!skb->encapsulation)
	81	return features;
	82
	83	switch (vlan_get_protocol(skb)) {
	84	case htons(ETH_P_IP):
	85	l4_hdr = ip_hdr(skb)->protocol;
	86	break;
	87	case htons(ETH_P_IPV6):
	88	l4_hdr = ipv6_hdr(skb)->nexthdr;
	89	break;
	90	default:
	91	return features;;
	92	}
	93
	94	if ((l4_hdr == IPPROTO_UDP) &&
11bf7828 JS	95	(skb->inner_protocol_type != ENCAP_TYPE_ETHER \|\|
	96	skb->inner_protocol != htons(ETH_P_TEB) \|\|
	97	(skb_inner_mac_header(skb) - skb_transport_header(skb) !=
	98	sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
5f35227e	99	return features & ~(NETIF_F_ALL_CSUM \| NETIF_F_GSO_MASK);
11bf7828	100
5f35227e	101	return features;
11bf7828	102	}
23e62de3	103
e6cd988c JG	104	/* IP header + UDP + VXLAN + Ethernet header */
	105	#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
	106	/* IPv6 header + UDP + VXLAN + Ethernet header */
	107	#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
	108
	109	#if IS_ENABLED(CONFIG_VXLAN)
53cf5275	110	void vxlan_get_rx_port(struct net_device *netdev);
e6cd988c JG	111	#else
	112	static inline void vxlan_get_rx_port(struct net_device *netdev)
	113	{
	114	}
	115	#endif
012a5729	116	#endif