2 #define __NET_VXLAN_H 1
5 #include <linux/ipv6.h>
6 #include <linux/if_vlan.h>
7 #include <linux/skbuff.h>
8 #include <linux/netdevice.h>
11 #define VNI_HASH_BITS 10
12 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
15 * VXLAN Group Based Policy Extension:
16 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
17 * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R| Group Policy ID |
18 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
19 * | VXLAN Network Identifier (VNI) | Reserved |
20 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
22 * D = Don't Learn bit. When set, this bit indicates that the egress
23 * VTEP MUST NOT learn the source address of the encapsulated frame.
25 * A = Indicates that the group policy has already been applied to
26 * this packet. Policies MUST NOT be applied by devices when the
29 * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy
33 #ifdef __LITTLE_ENDIAN_BITFIELD
34 __u8 reserved_flags1:3,
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 __u8 reserved_flags1:1,
46 #error "Please fix <asm/byteorder.h>"
52 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF)
56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
57 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
60 #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
61 #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
62 #define VXLAN_GBP_ID_MASK (0xFFFF)
64 /* VXLAN protocol header:
65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
66 * |G|R|R|R|I|R|R|C| Reserved |
67 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
68 * | VXLAN Network Identifier (VNI) | Reserved |
69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71 * G = 1 Group Policy (VXLAN-GBP)
72 * I = 1 VXLAN Network Identifier (VNI) present
73 * C = 1 Remote checksum offload (RCO)
80 /* VXLAN header flags. */
81 #define VXLAN_HF_RCO BIT(24)
82 #define VXLAN_HF_VNI BIT(27)
83 #define VXLAN_HF_GBP BIT(31)
85 /* Remote checksum offload header option */
86 #define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */
87 #define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */
88 #define VXLAN_RCO_SHIFT 1 /* Left shift of start */
89 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
90 #define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT)
92 #define VXLAN_N_VID (1u << 24)
93 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
94 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
96 struct vxlan_metadata {
102 typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb,
103 struct vxlan_metadata *md);
105 /* per UDP socket information */
107 struct hlist_node hlist;
110 struct work_struct del_work;
113 struct hlist_head vni_list[VNI_HASH_SIZE];
115 struct udp_offload udp_offloads;
119 #define VXLAN_F_LEARN 0x01
120 #define VXLAN_F_PROXY 0x02
121 #define VXLAN_F_RSC 0x04
122 #define VXLAN_F_L2MISS 0x08
123 #define VXLAN_F_L3MISS 0x10
124 #define VXLAN_F_IPV6 0x20
125 #define VXLAN_F_UDP_CSUM 0x40
126 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
127 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
128 #define VXLAN_F_REMCSUM_TX 0x200
129 #define VXLAN_F_REMCSUM_RX 0x400
130 #define VXLAN_F_GBP 0x800
132 /* These flags must match in order for a socket to be shareable */
133 #define VXLAN_F_UNSHAREABLE VXLAN_F_GBP
135 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
136 vxlan_rcv_t *rcv, void *data,
137 bool no_share, u32 flags);
139 void vxlan_sock_release(struct vxlan_sock *vs);
141 int vxlan_xmit_skb(struct vxlan_sock *vs,
142 struct rtable *rt, struct sk_buff *skb,
143 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
144 __be16 src_port, __be16 dst_port, struct vxlan_metadata *md,
147 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
148 netdev_features_t features)
152 if (!skb->encapsulation)
155 switch (vlan_get_protocol(skb)) {
156 case htons(ETH_P_IP):
157 l4_hdr = ip_hdr(skb)->protocol;
159 case htons(ETH_P_IPV6):
160 l4_hdr = ipv6_hdr(skb)->nexthdr;
166 if ((l4_hdr == IPPROTO_UDP) &&
167 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
168 skb->inner_protocol != htons(ETH_P_TEB) ||
169 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
170 sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
171 return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
176 /* IP header + UDP + VXLAN + Ethernet header */
177 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
178 /* IPv6 header + UDP + VXLAN + Ethernet header */
179 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
181 #if IS_ENABLED(CONFIG_VXLAN)
182 void vxlan_get_rx_port(struct net_device *netdev);
184 static inline void vxlan_get_rx_port(struct net_device *netdev)