Linux kernel mirror (for testing)
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linux
1#ifndef __NET_VXLAN_H
2#define __NET_VXLAN_H 1
3
4#include <linux/if_vlan.h>
5#include <net/udp_tunnel.h>
6#include <net/dst_metadata.h>
7#include <net/udp_tunnel.h>
8
9/* VXLAN protocol (RFC 7348) header:
10 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
11 * |R|R|R|R|I|R|R|R| Reserved |
12 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
13 * | VXLAN Network Identifier (VNI) | Reserved |
14 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
15 *
16 * I = VXLAN Network Identifier (VNI) present.
17 */
18struct vxlanhdr {
19 __be32 vx_flags;
20 __be32 vx_vni;
21};
22
23/* VXLAN header flags. */
24#define VXLAN_HF_VNI cpu_to_be32(BIT(27))
25
26#define VXLAN_N_VID (1u << 24)
27#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
28#define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8)
29#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
30
31#define VNI_HASH_BITS 10
32#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
33#define FDB_HASH_BITS 8
34#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
35
36/* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38 * |R|R|R|R|I|R|R|R|R|R|C| Reserved |
39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 * | VXLAN Network Identifier (VNI) |O| Csum start |
41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 *
43 * C = Remote checksum offload bit. When set indicates that the
44 * remote checksum offload data is present.
45 *
46 * O = Offset bit. Indicates the checksum offset relative to
47 * checksum start.
48 *
49 * Csum start = Checksum start divided by two.
50 *
51 * http://tools.ietf.org/html/draft-herbert-vxlan-rco
52 */
53
54/* VXLAN-RCO header flags. */
55#define VXLAN_HF_RCO cpu_to_be32(BIT(21))
56
57/* Remote checksum offload header option */
58#define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */
59#define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */
60#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
61#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
62#define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
63
64/*
65 * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
67 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
68 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
69 * | VXLAN Network Identifier (VNI) | Reserved |
70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71 *
72 * G = Group Policy ID present.
73 *
74 * D = Don't Learn bit. When set, this bit indicates that the egress
75 * VTEP MUST NOT learn the source address of the encapsulated frame.
76 *
77 * A = Indicates that the group policy has already been applied to
78 * this packet. Policies MUST NOT be applied by devices when the
79 * A bit is set.
80 *
81 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
82 */
83struct vxlanhdr_gbp {
84 u8 vx_flags;
85#ifdef __LITTLE_ENDIAN_BITFIELD
86 u8 reserved_flags1:3,
87 policy_applied:1,
88 reserved_flags2:2,
89 dont_learn:1,
90 reserved_flags3:1;
91#elif defined(__BIG_ENDIAN_BITFIELD)
92 u8 reserved_flags1:1,
93 dont_learn:1,
94 reserved_flags2:2,
95 policy_applied:1,
96 reserved_flags3:3;
97#else
98#error "Please fix <asm/byteorder.h>"
99#endif
100 __be16 policy_id;
101 __be32 vx_vni;
102};
103
104/* VXLAN-GBP header flags. */
105#define VXLAN_HF_GBP cpu_to_be32(BIT(31))
106
107#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
108
109/* skb->mark mapping
110 *
111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
113 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
114 */
115#define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
116#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
117#define VXLAN_GBP_ID_MASK (0xFFFF)
118
119/*
120 * VXLAN Generic Protocol Extension (VXLAN_F_GPE):
121 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
122 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
123 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
124 * | VXLAN Network Identifier (VNI) | Reserved |
125 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
126 *
127 * Ver = Version. Indicates VXLAN GPE protocol version.
128 *
129 * P = Next Protocol Bit. The P bit is set to indicate that the
130 * Next Protocol field is present.
131 *
132 * O = OAM Flag Bit. The O bit is set to indicate that the packet
133 * is an OAM packet.
134 *
135 * Next Protocol = This 8 bit field indicates the protocol header
136 * immediately following the VXLAN GPE header.
137 *
138 * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
139 */
140
141struct vxlanhdr_gpe {
142#if defined(__LITTLE_ENDIAN_BITFIELD)
143 u8 oam_flag:1,
144 reserved_flags1:1,
145 np_applied:1,
146 instance_applied:1,
147 version:2,
148reserved_flags2:2;
149#elif defined(__BIG_ENDIAN_BITFIELD)
150 u8 reserved_flags2:2,
151 version:2,
152 instance_applied:1,
153 np_applied:1,
154 reserved_flags1:1,
155 oam_flag:1;
156#endif
157 u8 reserved_flags3;
158 u8 reserved_flags4;
159 u8 next_protocol;
160 __be32 vx_vni;
161};
162
163/* VXLAN-GPE header flags. */
164#define VXLAN_HF_VER cpu_to_be32(BIT(29) | BIT(28))
165#define VXLAN_HF_NP cpu_to_be32(BIT(26))
166#define VXLAN_HF_OAM cpu_to_be32(BIT(24))
167
168#define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
169 cpu_to_be32(0xff))
170
171/* VXLAN-GPE header Next Protocol. */
172#define VXLAN_GPE_NP_IPV4 0x01
173#define VXLAN_GPE_NP_IPV6 0x02
174#define VXLAN_GPE_NP_ETHERNET 0x03
175#define VXLAN_GPE_NP_NSH 0x04
176
177struct vxlan_metadata {
178 u32 gbp;
179};
180
181/* per UDP socket information */
182struct vxlan_sock {
183 struct hlist_node hlist;
184 struct socket *sock;
185 struct hlist_head vni_list[VNI_HASH_SIZE];
186 refcount_t refcnt;
187 u32 flags;
188};
189
190union vxlan_addr {
191 struct sockaddr_in sin;
192 struct sockaddr_in6 sin6;
193 struct sockaddr sa;
194};
195
196struct vxlan_rdst {
197 union vxlan_addr remote_ip;
198 __be16 remote_port;
199 __be32 remote_vni;
200 u32 remote_ifindex;
201 struct list_head list;
202 struct rcu_head rcu;
203 struct dst_cache dst_cache;
204};
205
206struct vxlan_config {
207 union vxlan_addr remote_ip;
208 union vxlan_addr saddr;
209 __be32 vni;
210 int remote_ifindex;
211 int mtu;
212 __be16 dst_port;
213 u16 port_min;
214 u16 port_max;
215 u8 tos;
216 u8 ttl;
217 __be32 label;
218 u32 flags;
219 unsigned long age_interval;
220 unsigned int addrmax;
221 bool no_share;
222};
223
224struct vxlan_dev_node {
225 struct hlist_node hlist;
226 struct vxlan_dev *vxlan;
227};
228
229/* Pseudo network device */
230struct vxlan_dev {
231 struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
232#if IS_ENABLED(CONFIG_IPV6)
233 struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
234#endif
235 struct list_head next; /* vxlan's per namespace list */
236 struct vxlan_sock __rcu *vn4_sock; /* listening socket for IPv4 */
237#if IS_ENABLED(CONFIG_IPV6)
238 struct vxlan_sock __rcu *vn6_sock; /* listening socket for IPv6 */
239#endif
240 struct net_device *dev;
241 struct net *net; /* netns for packet i/o */
242 struct vxlan_rdst default_dst; /* default destination */
243
244 struct timer_list age_timer;
245 spinlock_t hash_lock;
246 unsigned int addrcnt;
247 struct gro_cells gro_cells;
248
249 struct vxlan_config cfg;
250
251 struct hlist_head fdb_head[FDB_HASH_SIZE];
252};
253
254#define VXLAN_F_LEARN 0x01
255#define VXLAN_F_PROXY 0x02
256#define VXLAN_F_RSC 0x04
257#define VXLAN_F_L2MISS 0x08
258#define VXLAN_F_L3MISS 0x10
259#define VXLAN_F_IPV6 0x20
260#define VXLAN_F_UDP_ZERO_CSUM_TX 0x40
261#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
262#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
263#define VXLAN_F_REMCSUM_TX 0x200
264#define VXLAN_F_REMCSUM_RX 0x400
265#define VXLAN_F_GBP 0x800
266#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
267#define VXLAN_F_COLLECT_METADATA 0x2000
268#define VXLAN_F_GPE 0x4000
269#define VXLAN_F_IPV6_LINKLOCAL 0x8000
270
271/* Flags that are used in the receive path. These flags must match in
272 * order for a socket to be shareable
273 */
274#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
275 VXLAN_F_GPE | \
276 VXLAN_F_UDP_ZERO_CSUM6_RX | \
277 VXLAN_F_REMCSUM_RX | \
278 VXLAN_F_REMCSUM_NOPARTIAL | \
279 VXLAN_F_COLLECT_METADATA)
280
281/* Flags that can be set together with VXLAN_F_GPE. */
282#define VXLAN_F_ALLOWED_GPE (VXLAN_F_GPE | \
283 VXLAN_F_IPV6 | \
284 VXLAN_F_IPV6_LINKLOCAL | \
285 VXLAN_F_UDP_ZERO_CSUM_TX | \
286 VXLAN_F_UDP_ZERO_CSUM6_TX | \
287 VXLAN_F_UDP_ZERO_CSUM6_RX | \
288 VXLAN_F_COLLECT_METADATA)
289
290struct net_device *vxlan_dev_create(struct net *net, const char *name,
291 u8 name_assign_type, struct vxlan_config *conf);
292
293static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
294 netdev_features_t features)
295{
296 u8 l4_hdr = 0;
297
298 if (!skb->encapsulation)
299 return features;
300
301 switch (vlan_get_protocol(skb)) {
302 case htons(ETH_P_IP):
303 l4_hdr = ip_hdr(skb)->protocol;
304 break;
305 case htons(ETH_P_IPV6):
306 l4_hdr = ipv6_hdr(skb)->nexthdr;
307 break;
308 default:
309 return features;;
310 }
311
312 if ((l4_hdr == IPPROTO_UDP) &&
313 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
314 skb->inner_protocol != htons(ETH_P_TEB) ||
315 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
316 sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
317 (skb->ip_summed != CHECKSUM_NONE &&
318 !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
319 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
320
321 return features;
322}
323
324/* IP header + UDP + VXLAN + Ethernet header */
325#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
326/* IPv6 header + UDP + VXLAN + Ethernet header */
327#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
328
329static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
330{
331 return (struct vxlanhdr *)(udp_hdr(skb) + 1);
332}
333
334static inline __be32 vxlan_vni(__be32 vni_field)
335{
336#if defined(__BIG_ENDIAN)
337 return (__force __be32)((__force u32)vni_field >> 8);
338#else
339 return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
340#endif
341}
342
343static inline __be32 vxlan_vni_field(__be32 vni)
344{
345#if defined(__BIG_ENDIAN)
346 return (__force __be32)((__force u32)vni << 8);
347#else
348 return (__force __be32)((__force u32)vni >> 8);
349#endif
350}
351
352static inline size_t vxlan_rco_start(__be32 vni_field)
353{
354 return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
355}
356
357static inline size_t vxlan_rco_offset(__be32 vni_field)
358{
359 return (vni_field & VXLAN_RCO_UDP) ?
360 offsetof(struct udphdr, check) :
361 offsetof(struct tcphdr, check);
362}
363
364static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
365{
366 __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
367
368 if (offset == offsetof(struct udphdr, check))
369 vni_field |= VXLAN_RCO_UDP;
370 return vni_field;
371}
372
373static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
374{
375 return vs->sock->sk->sk_family;
376}
377
378#endif