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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 | ||
3511494c TG |
14 | /* |
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 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
21 | * | |
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. | |
24 | * | |
25 | * A = Indicates that the group policy has already been applied to | |
26 | * this packet. Policies MUST NOT be applied by devices when the | |
27 | * A bit is set. | |
28 | * | |
29 | * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy | |
30 | */ | |
31 | struct vxlanhdr_gbp { | |
32 | __u8 vx_flags; | |
33 | #ifdef __LITTLE_ENDIAN_BITFIELD | |
34 | __u8 reserved_flags1:3, | |
35 | policy_applied:1, | |
36 | reserved_flags2:2, | |
37 | dont_learn:1, | |
38 | reserved_flags3:1; | |
39 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
40 | __u8 reserved_flags1:1, | |
41 | dont_learn:1, | |
42 | reserved_flags2:2, | |
43 | policy_applied:1, | |
44 | reserved_flags3:3; | |
45 | #else | |
46 | #error "Please fix <asm/byteorder.h>" | |
47 | #endif | |
48 | __be16 policy_id; | |
49 | __be32 vx_vni; | |
50 | }; | |
51 | ||
52 | #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) | |
53 | ||
54 | /* skb->mark mapping | |
55 | * | |
56 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
57 | * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID | | |
58 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
59 | */ | |
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) | |
63 | ||
64 | /* VXLAN protocol header: | |
65 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
66 | * |G|R|R|R|I|R|R|C| Reserved | | |
67 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
68 | * | VXLAN Network Identifier (VNI) | Reserved | | |
69 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
70 | * | |
71 | * G = 1 Group Policy (VXLAN-GBP) | |
72 | * I = 1 VXLAN Network Identifier (VNI) present | |
73 | * C = 1 Remote checksum offload (RCO) | |
74 | */ | |
11bf7828 JS |
75 | struct vxlanhdr { |
76 | __be32 vx_flags; | |
77 | __be32 vx_vni; | |
78 | }; | |
79 | ||
3bf39475 | 80 | /* VXLAN header flags. */ |
3511494c TG |
81 | #define VXLAN_HF_RCO BIT(24) |
82 | #define VXLAN_HF_VNI BIT(27) | |
83 | #define VXLAN_HF_GBP BIT(31) | |
dfd8645e TH |
84 | |
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) | |
3bf39475 TH |
91 | |
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)) | |
95 | ||
3511494c TG |
96 | struct vxlan_metadata { |
97 | __be32 vni; | |
98 | u32 gbp; | |
99 | }; | |
100 | ||
012a5729 | 101 | struct vxlan_sock; |
3511494c TG |
102 | typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, |
103 | struct vxlan_metadata *md); | |
012a5729 PS |
104 | |
105 | /* per UDP socket information */ | |
106 | struct vxlan_sock { | |
107 | struct hlist_node hlist; | |
108 | vxlan_rcv_t *rcv; | |
109 | void *data; | |
110 | struct work_struct del_work; | |
111 | struct socket *sock; | |
112 | struct rcu_head rcu; | |
113 | struct hlist_head vni_list[VNI_HASH_SIZE]; | |
114 | atomic_t refcnt; | |
dc01e7d3 | 115 | struct udp_offload udp_offloads; |
dfd8645e | 116 | u32 flags; |
012a5729 PS |
117 | }; |
118 | ||
359a0ea9 TH |
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 | |
dfd8645e TH |
128 | #define VXLAN_F_REMCSUM_TX 0x200 |
129 | #define VXLAN_F_REMCSUM_RX 0x400 | |
3511494c | 130 | #define VXLAN_F_GBP 0x800 |
359a0ea9 | 131 | |
af33c1ad TH |
132 | /* Flags that are used in the receive patch. These flags must match in |
133 | * order for a socket to be shareable | |
134 | */ | |
135 | #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \ | |
136 | VXLAN_F_UDP_ZERO_CSUM6_RX | \ | |
137 | VXLAN_F_REMCSUM_RX) | |
ac5132d1 | 138 | |
012a5729 PS |
139 | struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port, |
140 | vxlan_rcv_t *rcv, void *data, | |
359a0ea9 | 141 | bool no_share, u32 flags); |
012a5729 PS |
142 | |
143 | void vxlan_sock_release(struct vxlan_sock *vs); | |
49560532 | 144 | |
af33c1ad | 145 | int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb, |
49560532 | 146 | __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, |
3511494c | 147 | __be16 src_port, __be16 dst_port, struct vxlan_metadata *md, |
af33c1ad | 148 | bool xnet, u32 vxflags); |
49560532 | 149 | |
5f35227e JG |
150 | static inline netdev_features_t vxlan_features_check(struct sk_buff *skb, |
151 | netdev_features_t features) | |
11bf7828 | 152 | { |
5f35227e JG |
153 | u8 l4_hdr = 0; |
154 | ||
155 | if (!skb->encapsulation) | |
156 | return features; | |
157 | ||
158 | switch (vlan_get_protocol(skb)) { | |
159 | case htons(ETH_P_IP): | |
160 | l4_hdr = ip_hdr(skb)->protocol; | |
161 | break; | |
162 | case htons(ETH_P_IPV6): | |
163 | l4_hdr = ipv6_hdr(skb)->nexthdr; | |
164 | break; | |
165 | default: | |
166 | return features;; | |
167 | } | |
168 | ||
169 | if ((l4_hdr == IPPROTO_UDP) && | |
11bf7828 JS |
170 | (skb->inner_protocol_type != ENCAP_TYPE_ETHER || |
171 | skb->inner_protocol != htons(ETH_P_TEB) || | |
172 | (skb_inner_mac_header(skb) - skb_transport_header(skb) != | |
173 | sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) | |
5f35227e | 174 | return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK); |
11bf7828 | 175 | |
5f35227e | 176 | return features; |
11bf7828 | 177 | } |
23e62de3 | 178 | |
e6cd988c JG |
179 | /* IP header + UDP + VXLAN + Ethernet header */ |
180 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
181 | /* IPv6 header + UDP + VXLAN + Ethernet header */ | |
182 | #define VXLAN6_HEADROOM (40 + 8 + 8 + 14) | |
183 | ||
184 | #if IS_ENABLED(CONFIG_VXLAN) | |
53cf5275 | 185 | void vxlan_get_rx_port(struct net_device *netdev); |
e6cd988c JG |
186 | #else |
187 | static inline void vxlan_get_rx_port(struct net_device *netdev) | |
188 | { | |
189 | } | |
190 | #endif | |
012a5729 | 191 | #endif |