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

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