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Linux/include/net/vxlan.h

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

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