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1#ifndef __NET_VXLAN_H
2#define __NET_VXLAN_H 1
3
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4#include <linux/ip.h>
5#include <linux/ipv6.h>
6#include <linux/if_vlan.h>
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7#include <linux/skbuff.h>
8#include <linux/netdevice.h>
9#include <linux/udp.h>
ee122c79 10#include <net/dst_metadata.h>
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11
12#define VNI_HASH_BITS 10
13#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
14
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15/*
16 * VXLAN Group Based Policy Extension:
17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
18 * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R| Group Policy ID |
19 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
20 * | VXLAN Network Identifier (VNI) | Reserved |
21 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
22 *
23 * D = Don't Learn bit. When set, this bit indicates that the egress
24 * VTEP MUST NOT learn the source address of the encapsulated frame.
25 *
26 * A = Indicates that the group policy has already been applied to
27 * this packet. Policies MUST NOT be applied by devices when the
28 * A bit is set.
29 *
30 * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy
31 */
32struct vxlanhdr_gbp {
33 __u8 vx_flags;
34#ifdef __LITTLE_ENDIAN_BITFIELD
35 __u8 reserved_flags1:3,
36 policy_applied:1,
37 reserved_flags2:2,
38 dont_learn:1,
39 reserved_flags3:1;
40#elif defined(__BIG_ENDIAN_BITFIELD)
41 __u8 reserved_flags1:1,
42 dont_learn:1,
43 reserved_flags2:2,
44 policy_applied:1,
45 reserved_flags3:3;
46#else
47#error "Please fix <asm/byteorder.h>"
48#endif
49 __be16 policy_id;
50 __be32 vx_vni;
51};
52
53#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF)
54
55/* skb->mark mapping
56 *
57 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
58 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
60 */
61#define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
62#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
63#define VXLAN_GBP_ID_MASK (0xFFFF)
64
65/* VXLAN protocol header:
66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
67 * |G|R|R|R|I|R|R|C| Reserved |
68 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
69 * | VXLAN Network Identifier (VNI) | Reserved |
70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71 *
72 * G = 1 Group Policy (VXLAN-GBP)
73 * I = 1 VXLAN Network Identifier (VNI) present
74 * C = 1 Remote checksum offload (RCO)
75 */
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76struct vxlanhdr {
77 __be32 vx_flags;
78 __be32 vx_vni;
79};
80
3bf39475 81/* VXLAN header flags. */
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82#define VXLAN_HF_RCO BIT(24)
83#define VXLAN_HF_VNI BIT(27)
84#define VXLAN_HF_GBP BIT(31)
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85
86/* Remote checksum offload header option */
87#define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */
88#define VXLAN_RCO_UDP 0x80 /* Indicate UDP RCO (TCP when not set *) */
89#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
90#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
91#define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT)
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92
93#define VXLAN_N_VID (1u << 24)
94#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
40fb70f3 95#define VXLAN_VNI_MASK (VXLAN_VID_MASK << 8)
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96#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
97
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98#define VNI_HASH_BITS 10
99#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
100#define FDB_HASH_BITS 8
101#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
102
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103struct vxlan_metadata {
104 __be32 vni;
105 u32 gbp;
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106
107 /* Temporary until vxlan_rcv() API is gone */
108 struct metadata_dst *tun_dst;
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109};
110
012a5729 111struct vxlan_sock;
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112typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb,
113 struct vxlan_metadata *md);
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114
115/* per UDP socket information */
116struct vxlan_sock {
117 struct hlist_node hlist;
118 vxlan_rcv_t *rcv;
119 void *data;
120 struct work_struct del_work;
121 struct socket *sock;
122 struct rcu_head rcu;
123 struct hlist_head vni_list[VNI_HASH_SIZE];
124 atomic_t refcnt;
dc01e7d3 125 struct udp_offload udp_offloads;
dfd8645e 126 u32 flags;
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127};
128
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129union vxlan_addr {
130 struct sockaddr_in sin;
131 struct sockaddr_in6 sin6;
132 struct sockaddr sa;
133};
134
135struct vxlan_rdst {
136 union vxlan_addr remote_ip;
137 __be16 remote_port;
138 u32 remote_vni;
139 u32 remote_ifindex;
140 struct list_head list;
141 struct rcu_head rcu;
142};
143
144struct vxlan_config {
145 union vxlan_addr remote_ip;
146 union vxlan_addr saddr;
147 u32 vni;
148 int remote_ifindex;
149 int mtu;
150 __be16 dst_port;
151 __u16 port_min;
152 __u16 port_max;
153 __u8 tos;
154 __u8 ttl;
155 u32 flags;
156 unsigned long age_interval;
157 unsigned int addrmax;
158 bool no_share;
159};
160
161/* Pseudo network device */
162struct vxlan_dev {
163 struct hlist_node hlist; /* vni hash table */
164 struct list_head next; /* vxlan's per namespace list */
165 struct vxlan_sock *vn_sock; /* listening socket */
166 struct net_device *dev;
167 struct net *net; /* netns for packet i/o */
168 struct vxlan_rdst default_dst; /* default destination */
169 u32 flags; /* VXLAN_F_* in vxlan.h */
170
171 struct timer_list age_timer;
172 spinlock_t hash_lock;
173 unsigned int addrcnt;
174
175 struct vxlan_config cfg;
176
177 struct hlist_head fdb_head[FDB_HASH_SIZE];
178};
179
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180#define VXLAN_F_LEARN 0x01
181#define VXLAN_F_PROXY 0x02
182#define VXLAN_F_RSC 0x04
183#define VXLAN_F_L2MISS 0x08
184#define VXLAN_F_L3MISS 0x10
185#define VXLAN_F_IPV6 0x20
186#define VXLAN_F_UDP_CSUM 0x40
187#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
188#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
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189#define VXLAN_F_REMCSUM_TX 0x200
190#define VXLAN_F_REMCSUM_RX 0x400
3511494c 191#define VXLAN_F_GBP 0x800
0ace2ca8 192#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
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193#define VXLAN_F_COLLECT_METADATA 0x2000
194#define VXLAN_F_FLOW_BASED 0x4000
359a0ea9 195
d299ce14 196/* Flags that are used in the receive path. These flags must match in
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197 * order for a socket to be shareable
198 */
199#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
200 VXLAN_F_UDP_ZERO_CSUM6_RX | \
0ace2ca8 201 VXLAN_F_REMCSUM_RX | \
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202 VXLAN_F_REMCSUM_NOPARTIAL | \
203 VXLAN_F_COLLECT_METADATA | \
204 VXLAN_F_FLOW_BASED)
ac5132d1 205
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206struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
207 vxlan_rcv_t *rcv, void *data,
359a0ea9 208 bool no_share, u32 flags);
012a5729 209
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210struct net_device *vxlan_dev_create(struct net *net, const char *name,
211 u8 name_assign_type, struct vxlan_config *conf);
212
012a5729 213void vxlan_sock_release(struct vxlan_sock *vs);
49560532 214
79b16aad 215int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
49560532 216 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
3511494c 217 __be16 src_port, __be16 dst_port, struct vxlan_metadata *md,
af33c1ad 218 bool xnet, u32 vxflags);
49560532 219
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220static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
221 netdev_features_t features)
11bf7828 222{
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223 u8 l4_hdr = 0;
224
225 if (!skb->encapsulation)
226 return features;
227
228 switch (vlan_get_protocol(skb)) {
229 case htons(ETH_P_IP):
230 l4_hdr = ip_hdr(skb)->protocol;
231 break;
232 case htons(ETH_P_IPV6):
233 l4_hdr = ipv6_hdr(skb)->nexthdr;
234 break;
235 default:
236 return features;;
237 }
238
239 if ((l4_hdr == IPPROTO_UDP) &&
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240 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
241 skb->inner_protocol != htons(ETH_P_TEB) ||
242 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
243 sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
5f35227e 244 return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
11bf7828 245
5f35227e 246 return features;
11bf7828 247}
23e62de3 248
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249/* IP header + UDP + VXLAN + Ethernet header */
250#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
251/* IPv6 header + UDP + VXLAN + Ethernet header */
252#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
253
254#if IS_ENABLED(CONFIG_VXLAN)
53cf5275 255void vxlan_get_rx_port(struct net_device *netdev);
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256#else
257static inline void vxlan_get_rx_port(struct net_device *netdev)
258{
259}
260#endif
012a5729 261#endif