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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#include <net/dst_metadata.h>
11
12/* VXLAN protocol (RFC 7348) header:
13 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
14 * |R|R|R|R|I|R|R|R| Reserved |
15 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
16 * | VXLAN Network Identifier (VNI) | Reserved |
17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
18 *
19 * I = VXLAN Network Identifier (VNI) present.
20 */
21struct vxlanhdr {
22 __be32 vx_flags;
23 __be32 vx_vni;
24};
25
26/* VXLAN header flags. */
27#define VXLAN_HF_VNI cpu_to_be32(BIT(27))
28
29#define VXLAN_N_VID (1u << 24)
30#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
31#define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8)
32#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
33
34#define VNI_HASH_BITS 10
35#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
36#define FDB_HASH_BITS 8
37#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
38
39/* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 * |R|R|R|R|I|R|R|R|R|R|C| Reserved |
42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
43 * | VXLAN Network Identifier (VNI) |O| Csum start |
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 *
46 * C = Remote checksum offload bit. When set indicates that the
47 * remote checksum offload data is present.
48 *
49 * O = Offset bit. Indicates the checksum offset relative to
50 * checksum start.
51 *
52 * Csum start = Checksum start divided by two.
53 *
54 * http://tools.ietf.org/html/draft-herbert-vxlan-rco
55 */
56
57/* VXLAN-RCO header flags. */
58#define VXLAN_HF_RCO cpu_to_be32(BIT(21))
59
60/* Remote checksum offload header option */
61#define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */
62#define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */
63#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
64#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
65#define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
66
67/*
68 * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
70 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72 * | VXLAN Network Identifier (VNI) | Reserved |
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 *
75 * G = Group Policy ID present.
76 *
77 * D = Don't Learn bit. When set, this bit indicates that the egress
78 * VTEP MUST NOT learn the source address of the encapsulated frame.
79 *
80 * A = Indicates that the group policy has already been applied to
81 * this packet. Policies MUST NOT be applied by devices when the
82 * A bit is set.
83 *
84 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
85 */
86struct vxlanhdr_gbp {
87 u8 vx_flags;
88#ifdef __LITTLE_ENDIAN_BITFIELD
89 u8 reserved_flags1:3,
90 policy_applied:1,
91 reserved_flags2:2,
92 dont_learn:1,
93 reserved_flags3:1;
94#elif defined(__BIG_ENDIAN_BITFIELD)
95 u8 reserved_flags1:1,
96 dont_learn:1,
97 reserved_flags2:2,
98 policy_applied:1,
99 reserved_flags3:3;
100#else
101#error "Please fix <asm/byteorder.h>"
102#endif
103 __be16 policy_id;
104 __be32 vx_vni;
105};
106
107/* VXLAN-GBP header flags. */
108#define VXLAN_HF_GBP cpu_to_be32(BIT(31))
109
110#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
111
112/* skb->mark mapping
113 *
114 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
116 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117 */
118#define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
119#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
120#define VXLAN_GBP_ID_MASK (0xFFFF)
121
122struct vxlan_metadata {
123 u32 gbp;
124};
125
126/* per UDP socket information */
127struct vxlan_sock {
128 struct hlist_node hlist;
129 struct work_struct del_work;
130 struct socket *sock;
131 struct rcu_head rcu;
132 struct hlist_head vni_list[VNI_HASH_SIZE];
133 atomic_t refcnt;
134 struct udp_offload udp_offloads;
135 u32 flags;
136};
137
138union vxlan_addr {
139 struct sockaddr_in sin;
140 struct sockaddr_in6 sin6;
141 struct sockaddr sa;
142};
143
144struct vxlan_rdst {
145 union vxlan_addr remote_ip;
146 __be16 remote_port;
147 __be32 remote_vni;
148 u32 remote_ifindex;
149 struct list_head list;
150 struct rcu_head rcu;
151 struct dst_cache dst_cache;
152};
153
154struct vxlan_config {
155 union vxlan_addr remote_ip;
156 union vxlan_addr saddr;
157 __be32 vni;
158 int remote_ifindex;
159 int mtu;
160 __be16 dst_port;
161 u16 port_min;
162 u16 port_max;
163 u8 tos;
164 u8 ttl;
165 __be32 label;
166 u32 flags;
167 unsigned long age_interval;
168 unsigned int addrmax;
169 bool no_share;
170};
171
172/* Pseudo network device */
173struct vxlan_dev {
174 struct hlist_node hlist; /* vni hash table */
175 struct list_head next; /* vxlan's per namespace list */
176 struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */
177#if IS_ENABLED(CONFIG_IPV6)
178 struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */
179#endif
180 struct net_device *dev;
181 struct net *net; /* netns for packet i/o */
182 struct vxlan_rdst default_dst; /* default destination */
183 u32 flags; /* VXLAN_F_* in vxlan.h */
184
185 struct timer_list age_timer;
186 spinlock_t hash_lock;
187 unsigned int addrcnt;
188 struct gro_cells gro_cells;
189
190 struct vxlan_config cfg;
191
192 struct hlist_head fdb_head[FDB_HASH_SIZE];
193};
194
195#define VXLAN_F_LEARN 0x01
196#define VXLAN_F_PROXY 0x02
197#define VXLAN_F_RSC 0x04
198#define VXLAN_F_L2MISS 0x08
199#define VXLAN_F_L3MISS 0x10
200#define VXLAN_F_IPV6 0x20
201#define VXLAN_F_UDP_ZERO_CSUM_TX 0x40
202#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
203#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
204#define VXLAN_F_REMCSUM_TX 0x200
205#define VXLAN_F_REMCSUM_RX 0x400
206#define VXLAN_F_GBP 0x800
207#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
208#define VXLAN_F_COLLECT_METADATA 0x2000
209
210/* Flags that are used in the receive path. These flags must match in
211 * order for a socket to be shareable
212 */
213#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
214 VXLAN_F_UDP_ZERO_CSUM6_RX | \
215 VXLAN_F_REMCSUM_RX | \
216 VXLAN_F_REMCSUM_NOPARTIAL | \
217 VXLAN_F_COLLECT_METADATA)
218
219struct net_device *vxlan_dev_create(struct net *net, const char *name,
220 u8 name_assign_type, struct vxlan_config *conf);
221
222static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan,
223 unsigned short family)
224{
225#if IS_ENABLED(CONFIG_IPV6)
226 if (family == AF_INET6)
227 return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport;
228#endif
229 return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport;
230}
231
232static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
233 netdev_features_t features)
234{
235 u8 l4_hdr = 0;
236
237 if (!skb->encapsulation)
238 return features;
239
240 switch (vlan_get_protocol(skb)) {
241 case htons(ETH_P_IP):
242 l4_hdr = ip_hdr(skb)->protocol;
243 break;
244 case htons(ETH_P_IPV6):
245 l4_hdr = ipv6_hdr(skb)->nexthdr;
246 break;
247 default:
248 return features;;
249 }
250
251 if ((l4_hdr == IPPROTO_UDP) &&
252 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
253 skb->inner_protocol != htons(ETH_P_TEB) ||
254 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
255 sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
256 (skb->ip_summed != CHECKSUM_NONE &&
257 !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
258 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
259
260 return features;
261}
262
263/* IP header + UDP + VXLAN + Ethernet header */
264#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
265/* IPv6 header + UDP + VXLAN + Ethernet header */
266#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
267
268static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
269{
270 return (struct vxlanhdr *)(udp_hdr(skb) + 1);
271}
272
273static inline __be32 vxlan_vni(__be32 vni_field)
274{
275#if defined(__BIG_ENDIAN)
276 return (__force __be32)((__force u32)vni_field >> 8);
277#else
278 return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
279#endif
280}
281
282static inline __be32 vxlan_vni_field(__be32 vni)
283{
284#if defined(__BIG_ENDIAN)
285 return (__force __be32)((__force u32)vni << 8);
286#else
287 return (__force __be32)((__force u32)vni >> 8);
288#endif
289}
290
291static inline __be32 vxlan_tun_id_to_vni(__be64 tun_id)
292{
293#if defined(__BIG_ENDIAN)
294 return (__force __be32)tun_id;
295#else
296 return (__force __be32)((__force u64)tun_id >> 32);
297#endif
298}
299
300static inline __be64 vxlan_vni_to_tun_id(__be32 vni)
301{
302#if defined(__BIG_ENDIAN)
303 return (__force __be64)vni;
304#else
305 return (__force __be64)((u64)(__force u32)vni << 32);
306#endif
307}
308
309static inline size_t vxlan_rco_start(__be32 vni_field)
310{
311 return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
312}
313
314static inline size_t vxlan_rco_offset(__be32 vni_field)
315{
316 return (vni_field & VXLAN_RCO_UDP) ?
317 offsetof(struct udphdr, check) :
318 offsetof(struct tcphdr, check);
319}
320
321static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
322{
323 __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
324
325 if (offset == offsetof(struct udphdr, check))
326 vni_field |= VXLAN_RCO_UDP;
327 return vni_field;
328}
329
330#if IS_ENABLED(CONFIG_VXLAN)
331void vxlan_get_rx_port(struct net_device *netdev);
332#else
333static inline void vxlan_get_rx_port(struct net_device *netdev)
334{
335}
336#endif
337
338static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
339{
340 return vs->sock->sk->sk_family;
341}
342
343#endif