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 /* VXLAN protocol header */
15 struct vxlanhdr {
16 __be32 vx_flags;
17 __be32 vx_vni;
18 };
19
20 struct vxlan_sock;
21 typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, __be32 key);
22
23 /* per UDP socket information */
24 struct vxlan_sock {
25 struct hlist_node hlist;
26 vxlan_rcv_t *rcv;
27 void *data;
28 struct work_struct del_work;
29 struct socket *sock;
30 struct rcu_head rcu;
31 struct hlist_head vni_list[VNI_HASH_SIZE];
32 atomic_t refcnt;
33 struct udp_offload udp_offloads;
34 };
35
36 #define VXLAN_F_LEARN 0x01
37 #define VXLAN_F_PROXY 0x02
38 #define VXLAN_F_RSC 0x04
39 #define VXLAN_F_L2MISS 0x08
40 #define VXLAN_F_L3MISS 0x10
41 #define VXLAN_F_IPV6 0x20
42 #define VXLAN_F_UDP_CSUM 0x40
43 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
44 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
45
46 /* Flags that are used in the receive path. These flags must match in
47 * order for a socket to be shareable
48 */
49 #define VXLAN_F_RCV_FLAGS VXLAN_F_UDP_ZERO_CSUM6_RX
50
51 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
52 vxlan_rcv_t *rcv, void *data,
53 bool no_share, u32 flags);
54
55 void vxlan_sock_release(struct vxlan_sock *vs);
56
57 int vxlan_xmit_skb(struct vxlan_sock *vs,
58 struct rtable *rt, struct sk_buff *skb,
59 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
60 __be16 src_port, __be16 dst_port, __be32 vni, bool xnet);
61
vxlan_features_check(struct sk_buff * skb,netdev_features_t features)62 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
63 netdev_features_t features)
64 {
65 u8 l4_hdr = 0;
66
67 if (!skb->encapsulation)
68 return features;
69
70 switch (vlan_get_protocol(skb)) {
71 case htons(ETH_P_IP):
72 l4_hdr = ip_hdr(skb)->protocol;
73 break;
74 case htons(ETH_P_IPV6):
75 l4_hdr = ipv6_hdr(skb)->nexthdr;
76 break;
77 default:
78 return features;;
79 }
80
81 if ((l4_hdr == IPPROTO_UDP) &&
82 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
83 skb->inner_protocol != htons(ETH_P_TEB) ||
84 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
85 sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
86 return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
87
88 return features;
89 }
90
91 /* IP header + UDP + VXLAN + Ethernet header */
92 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
93 /* IPv6 header + UDP + VXLAN + Ethernet header */
94 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
95
96 #if IS_ENABLED(CONFIG_VXLAN)
97 void vxlan_get_rx_port(struct net_device *netdev);
98 #else
vxlan_get_rx_port(struct net_device * netdev)99 static inline void vxlan_get_rx_port(struct net_device *netdev)
100 {
101 }
102 #endif
103 #endif
104