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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
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_VXLAN_H
3#define __NET_VXLAN_H 1
4
5#include <linux/if_vlan.h>
6#include <net/udp_tunnel.h>
7#include <net/dst_metadata.h>
8#include <net/rtnetlink.h>
9#include <net/switchdev.h>
10#include <net/nexthop.h>
11
12#define IANA_VXLAN_UDP_PORT 4789
13#define IANA_VXLAN_GPE_UDP_PORT 4790
14
15/* VXLAN protocol (RFC 7348) header:
16 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
17 * |R|R|R|R|I|R|R|R| Reserved |
18 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
19 * | VXLAN Network Identifier (VNI) | Reserved |
20 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
21 *
22 * I = VXLAN Network Identifier (VNI) present.
23 */
24struct vxlanhdr {
25 __be32 vx_flags;
26 __be32 vx_vni;
27};
28
29/* VXLAN header flags. */
30#define VXLAN_HF_VNI cpu_to_be32(BIT(27))
31
32#define VXLAN_N_VID (1u << 24)
33#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
34#define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8)
35#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
36
37#define VNI_HASH_BITS 10
38#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
39#define FDB_HASH_BITS 8
40#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
41
42/* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 * |R|R|R|R|I|R|R|R|R|R|C| Reserved |
45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
46 * | VXLAN Network Identifier (VNI) |O| Csum start |
47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
48 *
49 * C = Remote checksum offload bit. When set indicates that the
50 * remote checksum offload data is present.
51 *
52 * O = Offset bit. Indicates the checksum offset relative to
53 * checksum start.
54 *
55 * Csum start = Checksum start divided by two.
56 *
57 * http://tools.ietf.org/html/draft-herbert-vxlan-rco
58 */
59
60/* VXLAN-RCO header flags. */
61#define VXLAN_HF_RCO cpu_to_be32(BIT(21))
62
63/* Remote checksum offload header option */
64#define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */
65#define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */
66#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
67#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
68#define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
69
70/*
71 * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
73 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
74 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
75 * | VXLAN Network Identifier (VNI) | Reserved |
76 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
77 *
78 * G = Group Policy ID present.
79 *
80 * D = Don't Learn bit. When set, this bit indicates that the egress
81 * VTEP MUST NOT learn the source address of the encapsulated frame.
82 *
83 * A = Indicates that the group policy has already been applied to
84 * this packet. Policies MUST NOT be applied by devices when the
85 * A bit is set.
86 *
87 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
88 */
89struct vxlanhdr_gbp {
90 u8 vx_flags;
91#ifdef __LITTLE_ENDIAN_BITFIELD
92 u8 reserved_flags1:3,
93 policy_applied:1,
94 reserved_flags2:2,
95 dont_learn:1,
96 reserved_flags3:1;
97#elif defined(__BIG_ENDIAN_BITFIELD)
98 u8 reserved_flags1:1,
99 dont_learn:1,
100 reserved_flags2:2,
101 policy_applied:1,
102 reserved_flags3:3;
103#else
104#error "Please fix <asm/byteorder.h>"
105#endif
106 __be16 policy_id;
107 __be32 vx_vni;
108};
109
110/* VXLAN-GBP header flags. */
111#define VXLAN_HF_GBP cpu_to_be32(BIT(31))
112
113#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
114
115/* skb->mark mapping
116 *
117 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
118 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
120 */
121#define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
122#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
123#define VXLAN_GBP_ID_MASK (0xFFFF)
124
125#define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \
126 VXLAN_GBP_ID_MASK)
127
128/*
129 * VXLAN Generic Protocol Extension (VXLAN_F_GPE):
130 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
131 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
132 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
133 * | VXLAN Network Identifier (VNI) | Reserved |
134 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
135 *
136 * Ver = Version. Indicates VXLAN GPE protocol version.
137 *
138 * P = Next Protocol Bit. The P bit is set to indicate that the
139 * Next Protocol field is present.
140 *
141 * O = OAM Flag Bit. The O bit is set to indicate that the packet
142 * is an OAM packet.
143 *
144 * Next Protocol = This 8 bit field indicates the protocol header
145 * immediately following the VXLAN GPE header.
146 *
147 * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
148 */
149
150struct vxlanhdr_gpe {
151#if defined(__LITTLE_ENDIAN_BITFIELD)
152 u8 oam_flag:1,
153 reserved_flags1:1,
154 np_applied:1,
155 instance_applied:1,
156 version:2,
157 reserved_flags2:2;
158#elif defined(__BIG_ENDIAN_BITFIELD)
159 u8 reserved_flags2:2,
160 version:2,
161 instance_applied:1,
162 np_applied:1,
163 reserved_flags1:1,
164 oam_flag:1;
165#endif
166 u8 reserved_flags3;
167 u8 reserved_flags4;
168 u8 next_protocol;
169 __be32 vx_vni;
170};
171
172/* VXLAN-GPE header flags. */
173#define VXLAN_HF_VER cpu_to_be32(BIT(29) | BIT(28))
174#define VXLAN_HF_NP cpu_to_be32(BIT(26))
175#define VXLAN_HF_OAM cpu_to_be32(BIT(24))
176
177#define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
178 cpu_to_be32(0xff))
179
180struct vxlan_metadata {
181 u32 gbp;
182};
183
184/* per UDP socket information */
185struct vxlan_sock {
186 struct hlist_node hlist;
187 struct socket *sock;
188 struct hlist_head vni_list[VNI_HASH_SIZE];
189 refcount_t refcnt;
190 u32 flags;
191};
192
193union vxlan_addr {
194 struct sockaddr_in sin;
195 struct sockaddr_in6 sin6;
196 struct sockaddr sa;
197};
198
199struct vxlan_rdst {
200 union vxlan_addr remote_ip;
201 __be16 remote_port;
202 u8 offloaded:1;
203 __be32 remote_vni;
204 u32 remote_ifindex;
205 struct net_device *remote_dev;
206 struct list_head list;
207 struct rcu_head rcu;
208 struct dst_cache dst_cache;
209};
210
211struct vxlan_config {
212 union vxlan_addr remote_ip;
213 union vxlan_addr saddr;
214 __be32 vni;
215 int remote_ifindex;
216 int mtu;
217 __be16 dst_port;
218 u16 port_min;
219 u16 port_max;
220 u8 tos;
221 u8 ttl;
222 __be32 label;
223 u32 flags;
224 unsigned long age_interval;
225 unsigned int addrmax;
226 bool no_share;
227 enum ifla_vxlan_df df;
228};
229
230enum {
231 VXLAN_VNI_STATS_RX,
232 VXLAN_VNI_STATS_RX_DROPS,
233 VXLAN_VNI_STATS_RX_ERRORS,
234 VXLAN_VNI_STATS_TX,
235 VXLAN_VNI_STATS_TX_DROPS,
236 VXLAN_VNI_STATS_TX_ERRORS,
237};
238
239struct vxlan_vni_stats {
240 u64 rx_packets;
241 u64 rx_bytes;
242 u64 rx_drops;
243 u64 rx_errors;
244 u64 tx_packets;
245 u64 tx_bytes;
246 u64 tx_drops;
247 u64 tx_errors;
248};
249
250struct vxlan_vni_stats_pcpu {
251 struct vxlan_vni_stats stats;
252 struct u64_stats_sync syncp;
253};
254
255struct vxlan_dev_node {
256 struct hlist_node hlist;
257 struct vxlan_dev *vxlan;
258};
259
260struct vxlan_vni_node {
261 struct rhash_head vnode;
262 struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
263#if IS_ENABLED(CONFIG_IPV6)
264 struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
265#endif
266 struct list_head vlist;
267 __be32 vni;
268 union vxlan_addr remote_ip; /* default remote ip for this vni */
269 struct vxlan_vni_stats_pcpu __percpu *stats;
270
271 struct rcu_head rcu;
272};
273
274struct vxlan_vni_group {
275 struct rhashtable vni_hash;
276 struct list_head vni_list;
277 u32 num_vnis;
278};
279
280/* Pseudo network device */
281struct vxlan_dev {
282 struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
283#if IS_ENABLED(CONFIG_IPV6)
284 struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
285#endif
286 struct list_head next; /* vxlan's per namespace list */
287 struct vxlan_sock __rcu *vn4_sock; /* listening socket for IPv4 */
288#if IS_ENABLED(CONFIG_IPV6)
289 struct vxlan_sock __rcu *vn6_sock; /* listening socket for IPv6 */
290#endif
291 struct net_device *dev;
292 struct net *net; /* netns for packet i/o */
293 struct vxlan_rdst default_dst; /* default destination */
294
295 struct timer_list age_timer;
296 spinlock_t hash_lock[FDB_HASH_SIZE];
297 unsigned int addrcnt;
298 struct gro_cells gro_cells;
299
300 struct vxlan_config cfg;
301
302 struct vxlan_vni_group __rcu *vnigrp;
303
304 struct hlist_head fdb_head[FDB_HASH_SIZE];
305};
306
307#define VXLAN_F_LEARN 0x01
308#define VXLAN_F_PROXY 0x02
309#define VXLAN_F_RSC 0x04
310#define VXLAN_F_L2MISS 0x08
311#define VXLAN_F_L3MISS 0x10
312#define VXLAN_F_IPV6 0x20
313#define VXLAN_F_UDP_ZERO_CSUM_TX 0x40
314#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
315#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
316#define VXLAN_F_REMCSUM_TX 0x200
317#define VXLAN_F_REMCSUM_RX 0x400
318#define VXLAN_F_GBP 0x800
319#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
320#define VXLAN_F_COLLECT_METADATA 0x2000
321#define VXLAN_F_GPE 0x4000
322#define VXLAN_F_IPV6_LINKLOCAL 0x8000
323#define VXLAN_F_TTL_INHERIT 0x10000
324#define VXLAN_F_VNIFILTER 0x20000
325
326/* Flags that are used in the receive path. These flags must match in
327 * order for a socket to be shareable
328 */
329#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
330 VXLAN_F_GPE | \
331 VXLAN_F_UDP_ZERO_CSUM6_RX | \
332 VXLAN_F_REMCSUM_RX | \
333 VXLAN_F_REMCSUM_NOPARTIAL | \
334 VXLAN_F_COLLECT_METADATA | \
335 VXLAN_F_VNIFILTER)
336
337/* Flags that can be set together with VXLAN_F_GPE. */
338#define VXLAN_F_ALLOWED_GPE (VXLAN_F_GPE | \
339 VXLAN_F_IPV6 | \
340 VXLAN_F_IPV6_LINKLOCAL | \
341 VXLAN_F_UDP_ZERO_CSUM_TX | \
342 VXLAN_F_UDP_ZERO_CSUM6_TX | \
343 VXLAN_F_UDP_ZERO_CSUM6_RX | \
344 VXLAN_F_COLLECT_METADATA | \
345 VXLAN_F_VNIFILTER)
346
347struct net_device *vxlan_dev_create(struct net *net, const char *name,
348 u8 name_assign_type, struct vxlan_config *conf);
349
350static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
351 netdev_features_t features)
352{
353 u8 l4_hdr = 0;
354
355 if (!skb->encapsulation)
356 return features;
357
358 switch (vlan_get_protocol(skb)) {
359 case htons(ETH_P_IP):
360 l4_hdr = ip_hdr(skb)->protocol;
361 break;
362 case htons(ETH_P_IPV6):
363 l4_hdr = ipv6_hdr(skb)->nexthdr;
364 break;
365 default:
366 return features;
367 }
368
369 if ((l4_hdr == IPPROTO_UDP) &&
370 (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
371 skb->inner_protocol != htons(ETH_P_TEB) ||
372 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
373 sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
374 (skb->ip_summed != CHECKSUM_NONE &&
375 !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
376 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
377
378 return features;
379}
380
381/* IP header + UDP + VXLAN + Ethernet header */
382#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
383/* IPv6 header + UDP + VXLAN + Ethernet header */
384#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
385
386static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
387{
388 return (struct vxlanhdr *)(udp_hdr(skb) + 1);
389}
390
391static inline __be32 vxlan_vni(__be32 vni_field)
392{
393#if defined(__BIG_ENDIAN)
394 return (__force __be32)((__force u32)vni_field >> 8);
395#else
396 return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
397#endif
398}
399
400static inline __be32 vxlan_vni_field(__be32 vni)
401{
402#if defined(__BIG_ENDIAN)
403 return (__force __be32)((__force u32)vni << 8);
404#else
405 return (__force __be32)((__force u32)vni >> 8);
406#endif
407}
408
409static inline size_t vxlan_rco_start(__be32 vni_field)
410{
411 return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
412}
413
414static inline size_t vxlan_rco_offset(__be32 vni_field)
415{
416 return (vni_field & VXLAN_RCO_UDP) ?
417 offsetof(struct udphdr, check) :
418 offsetof(struct tcphdr, check);
419}
420
421static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
422{
423 __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
424
425 if (offset == offsetof(struct udphdr, check))
426 vni_field |= VXLAN_RCO_UDP;
427 return vni_field;
428}
429
430static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
431{
432 return vs->sock->sk->sk_family;
433}
434
435#if IS_ENABLED(CONFIG_IPV6)
436
437static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
438{
439 if (ipa->sa.sa_family == AF_INET6)
440 return ipv6_addr_any(&ipa->sin6.sin6_addr);
441 else
442 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
443}
444
445static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
446{
447 if (ipa->sa.sa_family == AF_INET6)
448 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
449 else
450 return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
451}
452
453#else /* !IS_ENABLED(CONFIG_IPV6) */
454
455static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
456{
457 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
458}
459
460static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
461{
462 return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
463}
464
465#endif /* IS_ENABLED(CONFIG_IPV6) */
466
467static inline bool netif_is_vxlan(const struct net_device *dev)
468{
469 return dev->rtnl_link_ops &&
470 !strcmp(dev->rtnl_link_ops->kind, "vxlan");
471}
472
473struct switchdev_notifier_vxlan_fdb_info {
474 struct switchdev_notifier_info info; /* must be first */
475 union vxlan_addr remote_ip;
476 __be16 remote_port;
477 __be32 remote_vni;
478 u32 remote_ifindex;
479 u8 eth_addr[ETH_ALEN];
480 __be32 vni;
481 bool offloaded;
482 bool added_by_user;
483};
484
485#if IS_ENABLED(CONFIG_VXLAN)
486int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
487 struct switchdev_notifier_vxlan_fdb_info *fdb_info);
488int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
489 struct notifier_block *nb,
490 struct netlink_ext_ack *extack);
491void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni);
492
493#else
494static inline int
495vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
496 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
497{
498 return -ENOENT;
499}
500
501static inline int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
502 struct notifier_block *nb,
503 struct netlink_ext_ack *extack)
504{
505 return -EOPNOTSUPP;
506}
507
508static inline void
509vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
510{
511}
512#endif
513
514static inline void vxlan_flag_attr_error(int attrtype,
515 struct netlink_ext_ack *extack)
516{
517#define VXLAN_FLAG(flg) \
518 case IFLA_VXLAN_##flg: \
519 NL_SET_ERR_MSG_MOD(extack, \
520 "cannot change " #flg " flag"); \
521 break
522 switch (attrtype) {
523 VXLAN_FLAG(TTL_INHERIT);
524 VXLAN_FLAG(LEARNING);
525 VXLAN_FLAG(PROXY);
526 VXLAN_FLAG(RSC);
527 VXLAN_FLAG(L2MISS);
528 VXLAN_FLAG(L3MISS);
529 VXLAN_FLAG(COLLECT_METADATA);
530 VXLAN_FLAG(UDP_ZERO_CSUM6_TX);
531 VXLAN_FLAG(UDP_ZERO_CSUM6_RX);
532 VXLAN_FLAG(REMCSUM_TX);
533 VXLAN_FLAG(REMCSUM_RX);
534 VXLAN_FLAG(GBP);
535 VXLAN_FLAG(GPE);
536 VXLAN_FLAG(REMCSUM_NOPARTIAL);
537 default:
538 NL_SET_ERR_MSG_MOD(extack, \
539 "cannot change flag");
540 break;
541 }
542#undef VXLAN_FLAG
543}
544
545static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh,
546 int hash,
547 struct vxlan_rdst *rdst)
548{
549 struct fib_nh_common *nhc;
550
551 nhc = nexthop_path_fdb_result(nh, hash);
552 if (unlikely(!nhc))
553 return false;
554
555 switch (nhc->nhc_gw_family) {
556 case AF_INET:
557 rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4;
558 rdst->remote_ip.sa.sa_family = AF_INET;
559 break;
560 case AF_INET6:
561 rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6;
562 rdst->remote_ip.sa.sa_family = AF_INET6;
563 break;
564 }
565
566 return true;
567}
568
569#endif