xref: /kernel/linux/linux-6.6/include/net/vxlan.h (revision 62306a36) 
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 <linux/rhashtable-types.h>
7#include <net/udp_tunnel.h>
8#include <net/dst_metadata.h>
9#include <net/rtnetlink.h>
10#include <net/switchdev.h>
11#include <net/nexthop.h>
12
13#define IANA_VXLAN_UDP_PORT     4789
14#define IANA_VXLAN_GPE_UDP_PORT 4790
15
16/* VXLAN protocol (RFC 7348) header:
17 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
18 * |R|R|R|R|I|R|R|R|               Reserved                        |
19 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
20 * |                VXLAN Network Identifier (VNI) |   Reserved    |
21 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
22 *
23 * I = VXLAN Network Identifier (VNI) present.
24 */
25struct vxlanhdr {
26	__be32 vx_flags;
27	__be32 vx_vni;
28};
29
30/* VXLAN header flags. */
31#define VXLAN_HF_VNI	cpu_to_be32(BIT(27))
32
33#define VXLAN_N_VID     (1u << 24)
34#define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
35#define VXLAN_VNI_MASK	cpu_to_be32(VXLAN_VID_MASK << 8)
36#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
37
38#define VNI_HASH_BITS	10
39#define VNI_HASH_SIZE	(1<<VNI_HASH_BITS)
40#define FDB_HASH_BITS	8
41#define FDB_HASH_SIZE	(1<<FDB_HASH_BITS)
42
43/* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 * |R|R|R|R|I|R|R|R|R|R|C|              Reserved                   |
46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47 * |           VXLAN Network Identifier (VNI)      |O| Csum start  |
48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
49 *
50 * C = Remote checksum offload bit. When set indicates that the
51 *     remote checksum offload data is present.
52 *
53 * O = Offset bit. Indicates the checksum offset relative to
54 *     checksum start.
55 *
56 * Csum start = Checksum start divided by two.
57 *
58 * http://tools.ietf.org/html/draft-herbert-vxlan-rco
59 */
60
61/* VXLAN-RCO header flags. */
62#define VXLAN_HF_RCO	cpu_to_be32(BIT(21))
63
64/* Remote checksum offload header option */
65#define VXLAN_RCO_MASK	cpu_to_be32(0x7f)  /* Last byte of vni field */
66#define VXLAN_RCO_UDP	cpu_to_be32(0x80)  /* Indicate UDP RCO (TCP when not set *) */
67#define VXLAN_RCO_SHIFT	1		   /* Left shift of start */
68#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
69#define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
70
71/*
72 * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
76 * |                VXLAN Network Identifier (VNI) |   Reserved    |
77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
78 *
79 * G = Group Policy ID present.
80 *
81 * D = Don't Learn bit. When set, this bit indicates that the egress
82 *     VTEP MUST NOT learn the source address of the encapsulated frame.
83 *
84 * A = Indicates that the group policy has already been applied to
85 *     this packet. Policies MUST NOT be applied by devices when the
86 *     A bit is set.
87 *
88 * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
89 */
90struct vxlanhdr_gbp {
91	u8	vx_flags;
92#ifdef __LITTLE_ENDIAN_BITFIELD
93	u8	reserved_flags1:3,
94		policy_applied:1,
95		reserved_flags2:2,
96		dont_learn:1,
97		reserved_flags3:1;
98#elif defined(__BIG_ENDIAN_BITFIELD)
99	u8	reserved_flags1:1,
100		dont_learn:1,
101		reserved_flags2:2,
102		policy_applied:1,
103		reserved_flags3:3;
104#else
105#error	"Please fix <asm/byteorder.h>"
106#endif
107	__be16	policy_id;
108	__be32	vx_vni;
109};
110
111/* VXLAN-GBP header flags. */
112#define VXLAN_HF_GBP	cpu_to_be32(BIT(31))
113
114#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
115
116/* skb->mark mapping
117 *
118 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
120 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 */
122#define VXLAN_GBP_DONT_LEARN		(BIT(6) << 16)
123#define VXLAN_GBP_POLICY_APPLIED	(BIT(3) << 16)
124#define VXLAN_GBP_ID_MASK		(0xFFFF)
125
126#define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \
127			VXLAN_GBP_ID_MASK)
128
129/*
130 * VXLAN Generic Protocol Extension (VXLAN_F_GPE):
131 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
132 * |R|R|Ver|I|P|R|O|       Reserved                |Next Protocol  |
133 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
134 * |                VXLAN Network Identifier (VNI) |   Reserved    |
135 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
136 *
137 * Ver = Version. Indicates VXLAN GPE protocol version.
138 *
139 * P = Next Protocol Bit. The P bit is set to indicate that the
140 *     Next Protocol field is present.
141 *
142 * O = OAM Flag Bit. The O bit is set to indicate that the packet
143 *     is an OAM packet.
144 *
145 * Next Protocol = This 8 bit field indicates the protocol header
146 * immediately following the VXLAN GPE header.
147 *
148 * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
149 */
150
151struct vxlanhdr_gpe {
152#if defined(__LITTLE_ENDIAN_BITFIELD)
153	u8	oam_flag:1,
154		reserved_flags1:1,
155		np_applied:1,
156		instance_applied:1,
157		version:2,
158		reserved_flags2:2;
159#elif defined(__BIG_ENDIAN_BITFIELD)
160	u8	reserved_flags2:2,
161		version:2,
162		instance_applied:1,
163		np_applied:1,
164		reserved_flags1:1,
165		oam_flag:1;
166#endif
167	u8	reserved_flags3;
168	u8	reserved_flags4;
169	u8	next_protocol;
170	__be32	vx_vni;
171};
172
173/* VXLAN-GPE header flags. */
174#define VXLAN_HF_VER	cpu_to_be32(BIT(29) | BIT(28))
175#define VXLAN_HF_NP	cpu_to_be32(BIT(26))
176#define VXLAN_HF_OAM	cpu_to_be32(BIT(24))
177
178#define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
179			     cpu_to_be32(0xff))
180
181struct vxlan_metadata {
182	u32		gbp;
183};
184
185/* per UDP socket information */
186struct vxlan_sock {
187	struct hlist_node hlist;
188	struct socket	 *sock;
189	struct hlist_head vni_list[VNI_HASH_SIZE];
190	refcount_t	  refcnt;
191	u32		  flags;
192};
193
194union vxlan_addr {
195	struct sockaddr_in sin;
196	struct sockaddr_in6 sin6;
197	struct sockaddr sa;
198};
199
200struct vxlan_rdst {
201	union vxlan_addr	 remote_ip;
202	__be16			 remote_port;
203	u8			 offloaded:1;
204	__be32			 remote_vni;
205	u32			 remote_ifindex;
206	struct net_device	 *remote_dev;
207	struct list_head	 list;
208	struct rcu_head		 rcu;
209	struct dst_cache	 dst_cache;
210};
211
212struct vxlan_config {
213	union vxlan_addr	remote_ip;
214	union vxlan_addr	saddr;
215	__be32			vni;
216	int			remote_ifindex;
217	int			mtu;
218	__be16			dst_port;
219	u16			port_min;
220	u16			port_max;
221	u8			tos;
222	u8			ttl;
223	__be32			label;
224	u32			flags;
225	unsigned long		age_interval;
226	unsigned int		addrmax;
227	bool			no_share;
228	enum ifla_vxlan_df	df;
229};
230
231enum {
232	VXLAN_VNI_STATS_RX,
233	VXLAN_VNI_STATS_RX_DROPS,
234	VXLAN_VNI_STATS_RX_ERRORS,
235	VXLAN_VNI_STATS_TX,
236	VXLAN_VNI_STATS_TX_DROPS,
237	VXLAN_VNI_STATS_TX_ERRORS,
238};
239
240struct vxlan_vni_stats {
241	u64 rx_packets;
242	u64 rx_bytes;
243	u64 rx_drops;
244	u64 rx_errors;
245	u64 tx_packets;
246	u64 tx_bytes;
247	u64 tx_drops;
248	u64 tx_errors;
249};
250
251struct vxlan_vni_stats_pcpu {
252	struct vxlan_vni_stats stats;
253	struct u64_stats_sync syncp;
254};
255
256struct vxlan_dev_node {
257	struct hlist_node hlist;
258	struct vxlan_dev *vxlan;
259};
260
261struct vxlan_vni_node {
262	struct rhash_head vnode;
263	struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
264#if IS_ENABLED(CONFIG_IPV6)
265	struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
266#endif
267	struct list_head vlist;
268	__be32 vni;
269	union vxlan_addr remote_ip; /* default remote ip for this vni */
270	struct vxlan_vni_stats_pcpu __percpu *stats;
271
272	struct rcu_head rcu;
273};
274
275struct vxlan_vni_group {
276	struct rhashtable	vni_hash;
277	struct list_head	vni_list;
278	u32			num_vnis;
279};
280
281/* Pseudo network device */
282struct vxlan_dev {
283	struct vxlan_dev_node hlist4;	/* vni hash table for IPv4 socket */
284#if IS_ENABLED(CONFIG_IPV6)
285	struct vxlan_dev_node hlist6;	/* vni hash table for IPv6 socket */
286#endif
287	struct list_head  next;		/* vxlan's per namespace list */
288	struct vxlan_sock __rcu *vn4_sock;	/* listening socket for IPv4 */
289#if IS_ENABLED(CONFIG_IPV6)
290	struct vxlan_sock __rcu *vn6_sock;	/* listening socket for IPv6 */
291#endif
292	struct net_device *dev;
293	struct net	  *net;		/* netns for packet i/o */
294	struct vxlan_rdst default_dst;	/* default destination */
295
296	struct timer_list age_timer;
297	spinlock_t	  hash_lock[FDB_HASH_SIZE];
298	unsigned int	  addrcnt;
299	struct gro_cells  gro_cells;
300
301	struct vxlan_config	cfg;
302
303	struct vxlan_vni_group  __rcu *vnigrp;
304
305	struct hlist_head fdb_head[FDB_HASH_SIZE];
306
307	struct rhashtable mdb_tbl;
308	struct hlist_head mdb_list;
309	unsigned int mdb_seq;
310};
311
312#define VXLAN_F_LEARN			0x01
313#define VXLAN_F_PROXY			0x02
314#define VXLAN_F_RSC			0x04
315#define VXLAN_F_L2MISS			0x08
316#define VXLAN_F_L3MISS			0x10
317#define VXLAN_F_IPV6			0x20
318#define VXLAN_F_UDP_ZERO_CSUM_TX	0x40
319#define VXLAN_F_UDP_ZERO_CSUM6_TX	0x80
320#define VXLAN_F_UDP_ZERO_CSUM6_RX	0x100
321#define VXLAN_F_REMCSUM_TX		0x200
322#define VXLAN_F_REMCSUM_RX		0x400
323#define VXLAN_F_GBP			0x800
324#define VXLAN_F_REMCSUM_NOPARTIAL	0x1000
325#define VXLAN_F_COLLECT_METADATA	0x2000
326#define VXLAN_F_GPE			0x4000
327#define VXLAN_F_IPV6_LINKLOCAL		0x8000
328#define VXLAN_F_TTL_INHERIT		0x10000
329#define VXLAN_F_VNIFILTER               0x20000
330#define VXLAN_F_MDB			0x40000
331#define VXLAN_F_LOCALBYPASS		0x80000
332
333/* Flags that are used in the receive path. These flags must match in
334 * order for a socket to be shareable
335 */
336#define VXLAN_F_RCV_FLAGS		(VXLAN_F_GBP |			\
337					 VXLAN_F_GPE |			\
338					 VXLAN_F_UDP_ZERO_CSUM6_RX |	\
339					 VXLAN_F_REMCSUM_RX |		\
340					 VXLAN_F_REMCSUM_NOPARTIAL |	\
341					 VXLAN_F_COLLECT_METADATA |	\
342					 VXLAN_F_VNIFILTER)
343
344/* Flags that can be set together with VXLAN_F_GPE. */
345#define VXLAN_F_ALLOWED_GPE		(VXLAN_F_GPE |			\
346					 VXLAN_F_IPV6 |			\
347					 VXLAN_F_IPV6_LINKLOCAL |	\
348					 VXLAN_F_UDP_ZERO_CSUM_TX |	\
349					 VXLAN_F_UDP_ZERO_CSUM6_TX |	\
350					 VXLAN_F_UDP_ZERO_CSUM6_RX |	\
351					 VXLAN_F_COLLECT_METADATA  |	\
352					 VXLAN_F_VNIFILTER         |    \
353					 VXLAN_F_LOCALBYPASS)
354
355struct net_device *vxlan_dev_create(struct net *net, const char *name,
356				    u8 name_assign_type, struct vxlan_config *conf);
357
358static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
359						     netdev_features_t features)
360{
361	u8 l4_hdr = 0;
362
363	if (!skb->encapsulation)
364		return features;
365
366	switch (vlan_get_protocol(skb)) {
367	case htons(ETH_P_IP):
368		l4_hdr = ip_hdr(skb)->protocol;
369		break;
370	case htons(ETH_P_IPV6):
371		l4_hdr = ipv6_hdr(skb)->nexthdr;
372		break;
373	default:
374		return features;
375	}
376
377	if ((l4_hdr == IPPROTO_UDP) &&
378	    (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
379	     skb->inner_protocol != htons(ETH_P_TEB) ||
380	     (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
381	      sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
382	     (skb->ip_summed != CHECKSUM_NONE &&
383	      !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
384		return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
385
386	return features;
387}
388
389static inline int vxlan_headroom(u32 flags)
390{
391	/* VXLAN:     IP4/6 header + UDP + VXLAN + Ethernet header */
392	/* VXLAN-GPE: IP4/6 header + UDP + VXLAN */
393	return (flags & VXLAN_F_IPV6 ? sizeof(struct ipv6hdr) :
394				       sizeof(struct iphdr)) +
395	       sizeof(struct udphdr) + sizeof(struct vxlanhdr) +
396	       (flags & VXLAN_F_GPE ? 0 : ETH_HLEN);
397}
398
399static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
400{
401	return (struct vxlanhdr *)(udp_hdr(skb) + 1);
402}
403
404static inline __be32 vxlan_vni(__be32 vni_field)
405{
406#if defined(__BIG_ENDIAN)
407	return (__force __be32)((__force u32)vni_field >> 8);
408#else
409	return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
410#endif
411}
412
413static inline __be32 vxlan_vni_field(__be32 vni)
414{
415#if defined(__BIG_ENDIAN)
416	return (__force __be32)((__force u32)vni << 8);
417#else
418	return (__force __be32)((__force u32)vni >> 8);
419#endif
420}
421
422static inline size_t vxlan_rco_start(__be32 vni_field)
423{
424	return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
425}
426
427static inline size_t vxlan_rco_offset(__be32 vni_field)
428{
429	return (vni_field & VXLAN_RCO_UDP) ?
430		offsetof(struct udphdr, check) :
431		offsetof(struct tcphdr, check);
432}
433
434static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
435{
436	__be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
437
438	if (offset == offsetof(struct udphdr, check))
439		vni_field |= VXLAN_RCO_UDP;
440	return vni_field;
441}
442
443static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
444{
445	return vs->sock->sk->sk_family;
446}
447
448#if IS_ENABLED(CONFIG_IPV6)
449
450static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
451{
452	if (ipa->sa.sa_family == AF_INET6)
453		return ipv6_addr_any(&ipa->sin6.sin6_addr);
454	else
455		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
456}
457
458static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
459{
460	if (ipa->sa.sa_family == AF_INET6)
461		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
462	else
463		return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
464}
465
466#else /* !IS_ENABLED(CONFIG_IPV6) */
467
468static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
469{
470	return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
471}
472
473static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
474{
475	return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
476}
477
478#endif /* IS_ENABLED(CONFIG_IPV6) */
479
480static inline bool netif_is_vxlan(const struct net_device *dev)
481{
482	return dev->rtnl_link_ops &&
483	       !strcmp(dev->rtnl_link_ops->kind, "vxlan");
484}
485
486struct switchdev_notifier_vxlan_fdb_info {
487	struct switchdev_notifier_info info; /* must be first */
488	union vxlan_addr remote_ip;
489	__be16 remote_port;
490	__be32 remote_vni;
491	u32 remote_ifindex;
492	u8 eth_addr[ETH_ALEN];
493	__be32 vni;
494	bool offloaded;
495	bool added_by_user;
496};
497
498#if IS_ENABLED(CONFIG_VXLAN)
499int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
500		      struct switchdev_notifier_vxlan_fdb_info *fdb_info);
501int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
502		     struct notifier_block *nb,
503		     struct netlink_ext_ack *extack);
504void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni);
505
506#else
507static inline int
508vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
509		  struct switchdev_notifier_vxlan_fdb_info *fdb_info)
510{
511	return -ENOENT;
512}
513
514static inline int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
515				   struct notifier_block *nb,
516				   struct netlink_ext_ack *extack)
517{
518	return -EOPNOTSUPP;
519}
520
521static inline void
522vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
523{
524}
525#endif
526
527static inline void vxlan_flag_attr_error(int attrtype,
528					 struct netlink_ext_ack *extack)
529{
530#define VXLAN_FLAG(flg) \
531	case IFLA_VXLAN_##flg: \
532		NL_SET_ERR_MSG_MOD(extack, \
533				   "cannot change " #flg " flag"); \
534		break
535	switch (attrtype) {
536	VXLAN_FLAG(TTL_INHERIT);
537	VXLAN_FLAG(LEARNING);
538	VXLAN_FLAG(PROXY);
539	VXLAN_FLAG(RSC);
540	VXLAN_FLAG(L2MISS);
541	VXLAN_FLAG(L3MISS);
542	VXLAN_FLAG(COLLECT_METADATA);
543	VXLAN_FLAG(UDP_ZERO_CSUM6_TX);
544	VXLAN_FLAG(UDP_ZERO_CSUM6_RX);
545	VXLAN_FLAG(REMCSUM_TX);
546	VXLAN_FLAG(REMCSUM_RX);
547	VXLAN_FLAG(GBP);
548	VXLAN_FLAG(GPE);
549	VXLAN_FLAG(REMCSUM_NOPARTIAL);
550	default:
551		NL_SET_ERR_MSG_MOD(extack, \
552				   "cannot change flag");
553		break;
554	}
555#undef VXLAN_FLAG
556}
557
558static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh,
559					    u32 hash,
560					    struct vxlan_rdst *rdst)
561{
562	struct fib_nh_common *nhc;
563
564	nhc = nexthop_path_fdb_result(nh, hash >> 1);
565	if (unlikely(!nhc))
566		return false;
567
568	switch (nhc->nhc_gw_family) {
569	case AF_INET:
570		rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4;
571		rdst->remote_ip.sa.sa_family = AF_INET;
572		break;
573	case AF_INET6:
574		rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6;
575		rdst->remote_ip.sa.sa_family = AF_INET6;
576		break;
577	}
578
579	return true;
580}
581
582static inline void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, const struct vxlan_metadata *md)
583{
584	struct vxlanhdr_gbp *gbp;
585
586	if (!md->gbp)
587		return;
588
589	gbp = (struct vxlanhdr_gbp *)vxh;
590	vxh->vx_flags |= VXLAN_HF_GBP;
591
592	if (md->gbp & VXLAN_GBP_DONT_LEARN)
593		gbp->dont_learn = 1;
594
595	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
596		gbp->policy_applied = 1;
597
598	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
599}
600
601#endif
602