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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/udp_tunnel.h>
  9 
 10 /* VXLAN protocol (RFC 7348) header:
 11  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 12  * |R|R|R|R|I|R|R|R|               Reserved                        |
 13  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 14  * |                VXLAN Network Identifier (VNI) |   Reserved    |
 15  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 16  *
 17  * I = VXLAN Network Identifier (VNI) present.
 18  */
 19 struct vxlanhdr {
 20         __be32 vx_flags;
 21         __be32 vx_vni;
 22 };
 23 
 24 /* VXLAN header flags. */
 25 #define VXLAN_HF_VNI    cpu_to_be32(BIT(27))
 26 
 27 #define VXLAN_N_VID     (1u << 24)
 28 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
 29 #define VXLAN_VNI_MASK  cpu_to_be32(VXLAN_VID_MASK << 8)
 30 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
 31 
 32 #define VNI_HASH_BITS   10
 33 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
 34 #define FDB_HASH_BITS   8
 35 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
 36 
 37 /* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
 38  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 39  * |R|R|R|R|I|R|R|R|R|R|C|              Reserved                   |
 40  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 41  * |           VXLAN Network Identifier (VNI)      |O| Csum start  |
 42  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 43  *
 44  * C = Remote checksum offload bit. When set indicates that the
 45  *     remote checksum offload data is present.
 46  *
 47  * O = Offset bit. Indicates the checksum offset relative to
 48  *     checksum start.
 49  *
 50  * Csum start = Checksum start divided by two.
 51  *
 52  * http://tools.ietf.org/html/draft-herbert-vxlan-rco
 53  */
 54 
 55 /* VXLAN-RCO header flags. */
 56 #define VXLAN_HF_RCO    cpu_to_be32(BIT(21))
 57 
 58 /* Remote checksum offload header option */
 59 #define VXLAN_RCO_MASK  cpu_to_be32(0x7f)  /* Last byte of vni field */
 60 #define VXLAN_RCO_UDP   cpu_to_be32(0x80)  /* Indicate UDP RCO (TCP when not set *) */
 61 #define VXLAN_RCO_SHIFT 1                  /* Left shift of start */
 62 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
 63 #define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
 64 
 65 /*
 66  * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
 67  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 68  * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
 69  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 70  * |                VXLAN Network Identifier (VNI) |   Reserved    |
 71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 72  *
 73  * G = Group Policy ID present.
 74  *
 75  * D = Don't Learn bit. When set, this bit indicates that the egress
 76  *     VTEP MUST NOT learn the source address of the encapsulated frame.
 77  *
 78  * A = Indicates that the group policy has already been applied to
 79  *     this packet. Policies MUST NOT be applied by devices when the
 80  *     A bit is set.
 81  *
 82  * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
 83  */
 84 struct vxlanhdr_gbp {
 85         u8      vx_flags;
 86 #ifdef __LITTLE_ENDIAN_BITFIELD
 87         u8      reserved_flags1:3,
 88                 policy_applied:1,
 89                 reserved_flags2:2,
 90                 dont_learn:1,
 91                 reserved_flags3:1;
 92 #elif defined(__BIG_ENDIAN_BITFIELD)
 93         u8      reserved_flags1:1,
 94                 dont_learn:1,
 95                 reserved_flags2:2,
 96                 policy_applied:1,
 97                 reserved_flags3:3;
 98 #else
 99 #error  "Please fix <asm/byteorder.h>"
100 #endif
101         __be16  policy_id;
102         __be32  vx_vni;
103 };
104 
105 /* VXLAN-GBP header flags. */
106 #define VXLAN_HF_GBP    cpu_to_be32(BIT(31))
107 
108 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
109 
110 /* skb->mark mapping
111  *
112  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
113  * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
114  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115  */
116 #define VXLAN_GBP_DONT_LEARN            (BIT(6) << 16)
117 #define VXLAN_GBP_POLICY_APPLIED        (BIT(3) << 16)
118 #define VXLAN_GBP_ID_MASK               (0xFFFF)
119 
120 /*
121  * VXLAN Generic Protocol Extension (VXLAN_F_GPE):
122  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123  * |R|R|Ver|I|P|R|O|       Reserved                |Next Protocol  |
124  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
125  * |                VXLAN Network Identifier (VNI) |   Reserved    |
126  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
127  *
128  * Ver = Version. Indicates VXLAN GPE protocol version.
129  *
130  * P = Next Protocol Bit. The P bit is set to indicate that the
131  *     Next Protocol field is present.
132  *
133  * O = OAM Flag Bit. The O bit is set to indicate that the packet
134  *     is an OAM packet.
135  *
136  * Next Protocol = This 8 bit field indicates the protocol header
137  * immediately following the VXLAN GPE header.
138  *
139  * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
140  */
141 
142 struct vxlanhdr_gpe {
143 #if defined(__LITTLE_ENDIAN_BITFIELD)
144         u8      oam_flag:1,
145                 reserved_flags1:1,
146                 np_applied:1,
147                 instance_applied:1,
148                 version:2,
149                 reserved_flags2:2;
150 #elif defined(__BIG_ENDIAN_BITFIELD)
151         u8      reserved_flags2:2,
152                 version:2,
153                 instance_applied:1,
154                 np_applied:1,
155                 reserved_flags1:1,
156                 oam_flag:1;
157 #endif
158         u8      reserved_flags3;
159         u8      reserved_flags4;
160         u8      next_protocol;
161         __be32  vx_vni;
162 };
163 
164 /* VXLAN-GPE header flags. */
165 #define VXLAN_HF_VER    cpu_to_be32(BIT(29) | BIT(28))
166 #define VXLAN_HF_NP     cpu_to_be32(BIT(26))
167 #define VXLAN_HF_OAM    cpu_to_be32(BIT(24))
168 
169 #define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
170                              cpu_to_be32(0xff))
171 
172 struct vxlan_metadata {
173         u32             gbp;
174 };
175 
176 /* per UDP socket information */
177 struct vxlan_sock {
178         struct hlist_node hlist;
179         struct socket    *sock;
180         struct hlist_head vni_list[VNI_HASH_SIZE];
181         refcount_t        refcnt;
182         u32               flags;
183 };
184 
185 union vxlan_addr {
186         struct sockaddr_in sin;
187         struct sockaddr_in6 sin6;
188         struct sockaddr sa;
189 };
190 
191 struct vxlan_rdst {
192         union vxlan_addr         remote_ip;
193         __be16                   remote_port;
194         __be32                   remote_vni;
195         u32                      remote_ifindex;
196         struct list_head         list;
197         struct rcu_head          rcu;
198         struct dst_cache         dst_cache;
199 };
200 
201 struct vxlan_config {
202         union vxlan_addr        remote_ip;
203         union vxlan_addr        saddr;
204         __be32                  vni;
205         int                     remote_ifindex;
206         int                     mtu;
207         __be16                  dst_port;
208         u16                     port_min;
209         u16                     port_max;
210         u8                      tos;
211         u8                      ttl;
212         __be32                  label;
213         u32                     flags;
214         unsigned long           age_interval;
215         unsigned int            addrmax;
216         bool                    no_share;
217 };
218 
219 struct vxlan_dev_node {
220         struct hlist_node hlist;
221         struct vxlan_dev *vxlan;
222 };
223 
224 /* Pseudo network device */
225 struct vxlan_dev {
226         struct vxlan_dev_node hlist4;   /* vni hash table for IPv4 socket */
227 #if IS_ENABLED(CONFIG_IPV6)
228         struct vxlan_dev_node hlist6;   /* vni hash table for IPv6 socket */
229 #endif
230         struct list_head  next;         /* vxlan's per namespace list */
231         struct vxlan_sock __rcu *vn4_sock;      /* listening socket for IPv4 */
232 #if IS_ENABLED(CONFIG_IPV6)
233         struct vxlan_sock __rcu *vn6_sock;      /* listening socket for IPv6 */
234 #endif
235         struct net_device *dev;
236         struct net        *net;         /* netns for packet i/o */
237         struct vxlan_rdst default_dst;  /* default destination */
238 
239         struct timer_list age_timer;
240         spinlock_t        hash_lock;
241         unsigned int      addrcnt;
242         struct gro_cells  gro_cells;
243 
244         struct vxlan_config     cfg;
245 
246         struct hlist_head fdb_head[FDB_HASH_SIZE];
247 };
248 
249 #define VXLAN_F_LEARN                   0x01
250 #define VXLAN_F_PROXY                   0x02
251 #define VXLAN_F_RSC                     0x04
252 #define VXLAN_F_L2MISS                  0x08
253 #define VXLAN_F_L3MISS                  0x10
254 #define VXLAN_F_IPV6                    0x20
255 #define VXLAN_F_UDP_ZERO_CSUM_TX        0x40
256 #define VXLAN_F_UDP_ZERO_CSUM6_TX       0x80
257 #define VXLAN_F_UDP_ZERO_CSUM6_RX       0x100
258 #define VXLAN_F_REMCSUM_TX              0x200
259 #define VXLAN_F_REMCSUM_RX              0x400
260 #define VXLAN_F_GBP                     0x800
261 #define VXLAN_F_REMCSUM_NOPARTIAL       0x1000
262 #define VXLAN_F_COLLECT_METADATA        0x2000
263 #define VXLAN_F_GPE                     0x4000
264 #define VXLAN_F_IPV6_LINKLOCAL          0x8000
265 #define VXLAN_F_TTL_INHERIT             0x10000
266 
267 /* Flags that are used in the receive path. These flags must match in
268  * order for a socket to be shareable
269  */
270 #define VXLAN_F_RCV_FLAGS               (VXLAN_F_GBP |                  \
271                                          VXLAN_F_GPE |                  \
272                                          VXLAN_F_UDP_ZERO_CSUM6_RX |    \
273                                          VXLAN_F_REMCSUM_RX |           \
274                                          VXLAN_F_REMCSUM_NOPARTIAL |    \
275                                          VXLAN_F_COLLECT_METADATA)
276 
277 /* Flags that can be set together with VXLAN_F_GPE. */
278 #define VXLAN_F_ALLOWED_GPE             (VXLAN_F_GPE |                  \
279                                          VXLAN_F_IPV6 |                 \
280                                          VXLAN_F_IPV6_LINKLOCAL |       \
281                                          VXLAN_F_UDP_ZERO_CSUM_TX |     \
282                                          VXLAN_F_UDP_ZERO_CSUM6_TX |    \
283                                          VXLAN_F_UDP_ZERO_CSUM6_RX |    \
284                                          VXLAN_F_COLLECT_METADATA)
285 
286 struct net_device *vxlan_dev_create(struct net *net, const char *name,
287                                     u8 name_assign_type, struct vxlan_config *conf);
288 
289 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
290                                                      netdev_features_t features)
291 {
292         u8 l4_hdr = 0;
293 
294         if (!skb->encapsulation)
295                 return features;
296 
297         switch (vlan_get_protocol(skb)) {
298         case htons(ETH_P_IP):
299                 l4_hdr = ip_hdr(skb)->protocol;
300                 break;
301         case htons(ETH_P_IPV6):
302                 l4_hdr = ipv6_hdr(skb)->nexthdr;
303                 break;
304         default:
305                 return features;
306         }
307 
308         if ((l4_hdr == IPPROTO_UDP) &&
309             (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
310              skb->inner_protocol != htons(ETH_P_TEB) ||
311              (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
312               sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
313              (skb->ip_summed != CHECKSUM_NONE &&
314               !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
315                 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
316 
317         return features;
318 }
319 
320 /* IP header + UDP + VXLAN + Ethernet header */
321 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
322 /* IPv6 header + UDP + VXLAN + Ethernet header */
323 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
324 
325 static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
326 {
327         return (struct vxlanhdr *)(udp_hdr(skb) + 1);
328 }
329 
330 static inline __be32 vxlan_vni(__be32 vni_field)
331 {
332 #if defined(__BIG_ENDIAN)
333         return (__force __be32)((__force u32)vni_field >> 8);
334 #else
335         return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
336 #endif
337 }
338 
339 static inline __be32 vxlan_vni_field(__be32 vni)
340 {
341 #if defined(__BIG_ENDIAN)
342         return (__force __be32)((__force u32)vni << 8);
343 #else
344         return (__force __be32)((__force u32)vni >> 8);
345 #endif
346 }
347 
348 static inline size_t vxlan_rco_start(__be32 vni_field)
349 {
350         return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
351 }
352 
353 static inline size_t vxlan_rco_offset(__be32 vni_field)
354 {
355         return (vni_field & VXLAN_RCO_UDP) ?
356                 offsetof(struct udphdr, check) :
357                 offsetof(struct tcphdr, check);
358 }
359 
360 static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
361 {
362         __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
363 
364         if (offset == offsetof(struct udphdr, check))
365                 vni_field |= VXLAN_RCO_UDP;
366         return vni_field;
367 }
368 
369 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
370 {
371         return vs->sock->sk->sk_family;
372 }
373 
374 #endif
375 

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