xref: /linux/include/net/vxlan.h (revision 06d07429858317ded2db7986113a9e0129cd599b)
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  */
25 struct 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  */
90 struct 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 
151 struct 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 
181 struct vxlan_metadata {
182 	u32		gbp;
183 };
184 
185 /* per UDP socket information */
186 struct 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 
194 union vxlan_addr {
195 	struct sockaddr_in sin;
196 	struct sockaddr_in6 sin6;
197 	struct sockaddr sa;
198 };
199 
200 struct 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 
212 struct 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 	enum ifla_vxlan_label_policy	label_policy;
225 	u32				flags;
226 	unsigned long			age_interval;
227 	unsigned int			addrmax;
228 	bool				no_share;
229 	enum ifla_vxlan_df		df;
230 };
231 
232 enum {
233 	VXLAN_VNI_STATS_RX,
234 	VXLAN_VNI_STATS_RX_DROPS,
235 	VXLAN_VNI_STATS_RX_ERRORS,
236 	VXLAN_VNI_STATS_TX,
237 	VXLAN_VNI_STATS_TX_DROPS,
238 	VXLAN_VNI_STATS_TX_ERRORS,
239 };
240 
241 struct vxlan_vni_stats {
242 	u64 rx_packets;
243 	u64 rx_bytes;
244 	u64 rx_drops;
245 	u64 rx_errors;
246 	u64 tx_packets;
247 	u64 tx_bytes;
248 	u64 tx_drops;
249 	u64 tx_errors;
250 };
251 
252 struct vxlan_vni_stats_pcpu {
253 	struct vxlan_vni_stats stats;
254 	struct u64_stats_sync syncp;
255 };
256 
257 struct vxlan_dev_node {
258 	struct hlist_node hlist;
259 	struct vxlan_dev *vxlan;
260 };
261 
262 struct vxlan_vni_node {
263 	struct rhash_head vnode;
264 	struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
265 #if IS_ENABLED(CONFIG_IPV6)
266 	struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
267 #endif
268 	struct list_head vlist;
269 	__be32 vni;
270 	union vxlan_addr remote_ip; /* default remote ip for this vni */
271 	struct vxlan_vni_stats_pcpu __percpu *stats;
272 
273 	struct rcu_head rcu;
274 };
275 
276 struct vxlan_vni_group {
277 	struct rhashtable	vni_hash;
278 	struct list_head	vni_list;
279 	u32			num_vnis;
280 };
281 
282 /* Pseudo network device */
283 struct vxlan_dev {
284 	struct vxlan_dev_node hlist4;	/* vni hash table for IPv4 socket */
285 #if IS_ENABLED(CONFIG_IPV6)
286 	struct vxlan_dev_node hlist6;	/* vni hash table for IPv6 socket */
287 #endif
288 	struct list_head  next;		/* vxlan's per namespace list */
289 	struct vxlan_sock __rcu *vn4_sock;	/* listening socket for IPv4 */
290 #if IS_ENABLED(CONFIG_IPV6)
291 	struct vxlan_sock __rcu *vn6_sock;	/* listening socket for IPv6 */
292 #endif
293 	struct net_device *dev;
294 	struct net	  *net;		/* netns for packet i/o */
295 	struct vxlan_rdst default_dst;	/* default destination */
296 
297 	struct timer_list age_timer;
298 	spinlock_t	  hash_lock[FDB_HASH_SIZE];
299 	unsigned int	  addrcnt;
300 	struct gro_cells  gro_cells;
301 
302 	struct vxlan_config	cfg;
303 
304 	struct vxlan_vni_group  __rcu *vnigrp;
305 
306 	struct hlist_head fdb_head[FDB_HASH_SIZE];
307 
308 	struct rhashtable mdb_tbl;
309 	struct hlist_head mdb_list;
310 	unsigned int mdb_seq;
311 };
312 
313 #define VXLAN_F_LEARN			0x01
314 #define VXLAN_F_PROXY			0x02
315 #define VXLAN_F_RSC			0x04
316 #define VXLAN_F_L2MISS			0x08
317 #define VXLAN_F_L3MISS			0x10
318 #define VXLAN_F_IPV6			0x20
319 #define VXLAN_F_UDP_ZERO_CSUM_TX	0x40
320 #define VXLAN_F_UDP_ZERO_CSUM6_TX	0x80
321 #define VXLAN_F_UDP_ZERO_CSUM6_RX	0x100
322 #define VXLAN_F_REMCSUM_TX		0x200
323 #define VXLAN_F_REMCSUM_RX		0x400
324 #define VXLAN_F_GBP			0x800
325 #define VXLAN_F_REMCSUM_NOPARTIAL	0x1000
326 #define VXLAN_F_COLLECT_METADATA	0x2000
327 #define VXLAN_F_GPE			0x4000
328 #define VXLAN_F_IPV6_LINKLOCAL		0x8000
329 #define VXLAN_F_TTL_INHERIT		0x10000
330 #define VXLAN_F_VNIFILTER               0x20000
331 #define VXLAN_F_MDB			0x40000
332 #define VXLAN_F_LOCALBYPASS		0x80000
333 
334 /* Flags that are used in the receive path. These flags must match in
335  * order for a socket to be shareable
336  */
337 #define VXLAN_F_RCV_FLAGS		(VXLAN_F_GBP |			\
338 					 VXLAN_F_GPE |			\
339 					 VXLAN_F_UDP_ZERO_CSUM6_RX |	\
340 					 VXLAN_F_REMCSUM_RX |		\
341 					 VXLAN_F_REMCSUM_NOPARTIAL |	\
342 					 VXLAN_F_COLLECT_METADATA |	\
343 					 VXLAN_F_VNIFILTER)
344 
345 /* Flags that can be set together with VXLAN_F_GPE. */
346 #define VXLAN_F_ALLOWED_GPE		(VXLAN_F_GPE |			\
347 					 VXLAN_F_IPV6 |			\
348 					 VXLAN_F_IPV6_LINKLOCAL |	\
349 					 VXLAN_F_UDP_ZERO_CSUM_TX |	\
350 					 VXLAN_F_UDP_ZERO_CSUM6_TX |	\
351 					 VXLAN_F_UDP_ZERO_CSUM6_RX |	\
352 					 VXLAN_F_COLLECT_METADATA  |	\
353 					 VXLAN_F_VNIFILTER         |    \
354 					 VXLAN_F_LOCALBYPASS)
355 
356 struct net_device *vxlan_dev_create(struct net *net, const char *name,
357 				    u8 name_assign_type, struct vxlan_config *conf);
358 
vxlan_features_check(struct sk_buff * skb,netdev_features_t features)359 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
360 						     netdev_features_t features)
361 {
362 	u8 l4_hdr = 0;
363 
364 	if (!skb->encapsulation)
365 		return features;
366 
367 	switch (vlan_get_protocol(skb)) {
368 	case htons(ETH_P_IP):
369 		l4_hdr = ip_hdr(skb)->protocol;
370 		break;
371 	case htons(ETH_P_IPV6):
372 		l4_hdr = ipv6_hdr(skb)->nexthdr;
373 		break;
374 	default:
375 		return features;
376 	}
377 
378 	if ((l4_hdr == IPPROTO_UDP) &&
379 	    (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
380 	     skb->inner_protocol != htons(ETH_P_TEB) ||
381 	     (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
382 	      sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
383 	     (skb->ip_summed != CHECKSUM_NONE &&
384 	      !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
385 		return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
386 
387 	return features;
388 }
389 
vxlan_headroom(u32 flags)390 static inline int vxlan_headroom(u32 flags)
391 {
392 	/* VXLAN:     IP4/6 header + UDP + VXLAN + Ethernet header */
393 	/* VXLAN-GPE: IP4/6 header + UDP + VXLAN */
394 	return (flags & VXLAN_F_IPV6 ? sizeof(struct ipv6hdr) :
395 				       sizeof(struct iphdr)) +
396 	       sizeof(struct udphdr) + sizeof(struct vxlanhdr) +
397 	       (flags & VXLAN_F_GPE ? 0 : ETH_HLEN);
398 }
399 
vxlan_hdr(struct sk_buff * skb)400 static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
401 {
402 	return (struct vxlanhdr *)(udp_hdr(skb) + 1);
403 }
404 
vxlan_vni(__be32 vni_field)405 static inline __be32 vxlan_vni(__be32 vni_field)
406 {
407 #if defined(__BIG_ENDIAN)
408 	return (__force __be32)((__force u32)vni_field >> 8);
409 #else
410 	return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
411 #endif
412 }
413 
vxlan_vni_field(__be32 vni)414 static inline __be32 vxlan_vni_field(__be32 vni)
415 {
416 #if defined(__BIG_ENDIAN)
417 	return (__force __be32)((__force u32)vni << 8);
418 #else
419 	return (__force __be32)((__force u32)vni >> 8);
420 #endif
421 }
422 
vxlan_rco_start(__be32 vni_field)423 static inline size_t vxlan_rco_start(__be32 vni_field)
424 {
425 	return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
426 }
427 
vxlan_rco_offset(__be32 vni_field)428 static inline size_t vxlan_rco_offset(__be32 vni_field)
429 {
430 	return (vni_field & VXLAN_RCO_UDP) ?
431 		offsetof(struct udphdr, check) :
432 		offsetof(struct tcphdr, check);
433 }
434 
vxlan_compute_rco(unsigned int start,unsigned int offset)435 static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
436 {
437 	__be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
438 
439 	if (offset == offsetof(struct udphdr, check))
440 		vni_field |= VXLAN_RCO_UDP;
441 	return vni_field;
442 }
443 
vxlan_get_sk_family(struct vxlan_sock * vs)444 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
445 {
446 	return vs->sock->sk->sk_family;
447 }
448 
449 #if IS_ENABLED(CONFIG_IPV6)
450 
vxlan_addr_any(const union vxlan_addr * ipa)451 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
452 {
453 	if (ipa->sa.sa_family == AF_INET6)
454 		return ipv6_addr_any(&ipa->sin6.sin6_addr);
455 	else
456 		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
457 }
458 
vxlan_addr_multicast(const union vxlan_addr * ipa)459 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
460 {
461 	if (ipa->sa.sa_family == AF_INET6)
462 		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
463 	else
464 		return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
465 }
466 
467 #else /* !IS_ENABLED(CONFIG_IPV6) */
468 
vxlan_addr_any(const union vxlan_addr * ipa)469 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
470 {
471 	return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
472 }
473 
vxlan_addr_multicast(const union vxlan_addr * ipa)474 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
475 {
476 	return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
477 }
478 
479 #endif /* IS_ENABLED(CONFIG_IPV6) */
480 
netif_is_vxlan(const struct net_device * dev)481 static inline bool netif_is_vxlan(const struct net_device *dev)
482 {
483 	return dev->rtnl_link_ops &&
484 	       !strcmp(dev->rtnl_link_ops->kind, "vxlan");
485 }
486 
487 struct switchdev_notifier_vxlan_fdb_info {
488 	struct switchdev_notifier_info info; /* must be first */
489 	union vxlan_addr remote_ip;
490 	__be16 remote_port;
491 	__be32 remote_vni;
492 	u32 remote_ifindex;
493 	u8 eth_addr[ETH_ALEN];
494 	__be32 vni;
495 	bool offloaded;
496 	bool added_by_user;
497 };
498 
499 #if IS_ENABLED(CONFIG_VXLAN)
500 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
501 		      struct switchdev_notifier_vxlan_fdb_info *fdb_info);
502 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
503 		     struct notifier_block *nb,
504 		     struct netlink_ext_ack *extack);
505 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni);
506 
507 #else
508 static inline int
vxlan_fdb_find_uc(struct net_device * dev,const u8 * mac,__be32 vni,struct switchdev_notifier_vxlan_fdb_info * fdb_info)509 vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
510 		  struct switchdev_notifier_vxlan_fdb_info *fdb_info)
511 {
512 	return -ENOENT;
513 }
514 
vxlan_fdb_replay(const struct net_device * dev,__be32 vni,struct notifier_block * nb,struct netlink_ext_ack * extack)515 static inline int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
516 				   struct notifier_block *nb,
517 				   struct netlink_ext_ack *extack)
518 {
519 	return -EOPNOTSUPP;
520 }
521 
522 static inline void
vxlan_fdb_clear_offload(const struct net_device * dev,__be32 vni)523 vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
524 {
525 }
526 #endif
527 
vxlan_flag_attr_error(int attrtype,struct netlink_ext_ack * extack)528 static inline void vxlan_flag_attr_error(int attrtype,
529 					 struct netlink_ext_ack *extack)
530 {
531 #define VXLAN_FLAG(flg) \
532 	case IFLA_VXLAN_##flg: \
533 		NL_SET_ERR_MSG_MOD(extack, \
534 				   "cannot change " #flg " flag"); \
535 		break
536 	switch (attrtype) {
537 	VXLAN_FLAG(TTL_INHERIT);
538 	VXLAN_FLAG(LEARNING);
539 	VXLAN_FLAG(PROXY);
540 	VXLAN_FLAG(RSC);
541 	VXLAN_FLAG(L2MISS);
542 	VXLAN_FLAG(L3MISS);
543 	VXLAN_FLAG(COLLECT_METADATA);
544 	VXLAN_FLAG(UDP_ZERO_CSUM6_TX);
545 	VXLAN_FLAG(UDP_ZERO_CSUM6_RX);
546 	VXLAN_FLAG(REMCSUM_TX);
547 	VXLAN_FLAG(REMCSUM_RX);
548 	VXLAN_FLAG(GBP);
549 	VXLAN_FLAG(GPE);
550 	VXLAN_FLAG(REMCSUM_NOPARTIAL);
551 	default:
552 		NL_SET_ERR_MSG_MOD(extack, \
553 				   "cannot change flag");
554 		break;
555 	}
556 #undef VXLAN_FLAG
557 }
558 
vxlan_fdb_nh_path_select(struct nexthop * nh,u32 hash,struct vxlan_rdst * rdst)559 static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh,
560 					    u32 hash,
561 					    struct vxlan_rdst *rdst)
562 {
563 	struct fib_nh_common *nhc;
564 
565 	nhc = nexthop_path_fdb_result(nh, hash >> 1);
566 	if (unlikely(!nhc))
567 		return false;
568 
569 	switch (nhc->nhc_gw_family) {
570 	case AF_INET:
571 		rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4;
572 		rdst->remote_ip.sa.sa_family = AF_INET;
573 		break;
574 	case AF_INET6:
575 		rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6;
576 		rdst->remote_ip.sa.sa_family = AF_INET6;
577 		break;
578 	}
579 
580 	return true;
581 }
582 
vxlan_build_gbp_hdr(struct vxlanhdr * vxh,const struct vxlan_metadata * md)583 static inline void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, const struct vxlan_metadata *md)
584 {
585 	struct vxlanhdr_gbp *gbp;
586 
587 	if (!md->gbp)
588 		return;
589 
590 	gbp = (struct vxlanhdr_gbp *)vxh;
591 	vxh->vx_flags |= VXLAN_HF_GBP;
592 
593 	if (md->gbp & VXLAN_GBP_DONT_LEARN)
594 		gbp->dont_learn = 1;
595 
596 	if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
597 		gbp->policy_applied = 1;
598 
599 	gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
600 }
601 
602 #endif
603