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TOMOYO Linux Cross Reference
Linux/include/net/vxlan.h

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  1 #ifndef __NET_VXLAN_H
  2 #define __NET_VXLAN_H 1
  3 
  4 #include <linux/ip.h>
  5 #include <linux/ipv6.h>
  6 #include <linux/if_vlan.h>
  7 #include <linux/skbuff.h>
  8 #include <linux/netdevice.h>
  9 #include <linux/udp.h>
 10 #include <net/dst_metadata.h>
 11 
 12 /* VXLAN protocol (RFC 7348) header:
 13  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 14  * |R|R|R|R|I|R|R|R|               Reserved                        |
 15  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 16  * |                VXLAN Network Identifier (VNI) |   Reserved    |
 17  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 18  *
 19  * I = VXLAN Network Identifier (VNI) present.
 20  */
 21 struct vxlanhdr {
 22         __be32 vx_flags;
 23         __be32 vx_vni;
 24 };
 25 
 26 /* VXLAN header flags. */
 27 #define VXLAN_HF_VNI    cpu_to_be32(BIT(27))
 28 
 29 #define VXLAN_N_VID     (1u << 24)
 30 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
 31 #define VXLAN_VNI_MASK  cpu_to_be32(VXLAN_VID_MASK << 8)
 32 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
 33 
 34 #define VNI_HASH_BITS   10
 35 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
 36 #define FDB_HASH_BITS   8
 37 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
 38 
 39 /* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
 40  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 41  * |R|R|R|R|I|R|R|R|R|R|C|              Reserved                   |
 42  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 43  * |           VXLAN Network Identifier (VNI)      |O| Csum start  |
 44  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 45  *
 46  * C = Remote checksum offload bit. When set indicates that the
 47  *     remote checksum offload data is present.
 48  *
 49  * O = Offset bit. Indicates the checksum offset relative to
 50  *     checksum start.
 51  *
 52  * Csum start = Checksum start divided by two.
 53  *
 54  * http://tools.ietf.org/html/draft-herbert-vxlan-rco
 55  */
 56 
 57 /* VXLAN-RCO header flags. */
 58 #define VXLAN_HF_RCO    cpu_to_be32(BIT(21))
 59 
 60 /* Remote checksum offload header option */
 61 #define VXLAN_RCO_MASK  cpu_to_be32(0x7f)  /* Last byte of vni field */
 62 #define VXLAN_RCO_UDP   cpu_to_be32(0x80)  /* Indicate UDP RCO (TCP when not set *) */
 63 #define VXLAN_RCO_SHIFT 1                  /* Left shift of start */
 64 #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
 65 #define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
 66 
 67 /*
 68  * VXLAN Group Based Policy Extension (VXLAN_F_GBP):
 69  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 70  * |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
 71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 72  * |                VXLAN Network Identifier (VNI) |   Reserved    |
 73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 74  *
 75  * G = Group Policy ID present.
 76  *
 77  * D = Don't Learn bit. When set, this bit indicates that the egress
 78  *     VTEP MUST NOT learn the source address of the encapsulated frame.
 79  *
 80  * A = Indicates that the group policy has already been applied to
 81  *     this packet. Policies MUST NOT be applied by devices when the
 82  *     A bit is set.
 83  *
 84  * https://tools.ietf.org/html/draft-smith-vxlan-group-policy
 85  */
 86 struct vxlanhdr_gbp {
 87         u8      vx_flags;
 88 #ifdef __LITTLE_ENDIAN_BITFIELD
 89         u8      reserved_flags1:3,
 90                 policy_applied:1,
 91                 reserved_flags2:2,
 92                 dont_learn:1,
 93                 reserved_flags3:1;
 94 #elif defined(__BIG_ENDIAN_BITFIELD)
 95         u8      reserved_flags1:1,
 96                 dont_learn:1,
 97                 reserved_flags2:2,
 98                 policy_applied:1,
 99                 reserved_flags3:3;
100 #else
101 #error  "Please fix <asm/byteorder.h>"
102 #endif
103         __be16  policy_id;
104         __be32  vx_vni;
105 };
106 
107 /* VXLAN-GBP header flags. */
108 #define VXLAN_HF_GBP    cpu_to_be32(BIT(31))
109 
110 #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
111 
112 /* skb->mark mapping
113  *
114  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115  * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        |
116  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117  */
118 #define VXLAN_GBP_DONT_LEARN            (BIT(6) << 16)
119 #define VXLAN_GBP_POLICY_APPLIED        (BIT(3) << 16)
120 #define VXLAN_GBP_ID_MASK               (0xFFFF)
121 
122 struct vxlan_metadata {
123         u32             gbp;
124 };
125 
126 /* per UDP socket information */
127 struct vxlan_sock {
128         struct hlist_node hlist;
129         struct work_struct del_work;
130         struct socket    *sock;
131         struct rcu_head   rcu;
132         struct hlist_head vni_list[VNI_HASH_SIZE];
133         atomic_t          refcnt;
134         struct udp_offload udp_offloads;
135         u32               flags;
136 };
137 
138 union vxlan_addr {
139         struct sockaddr_in sin;
140         struct sockaddr_in6 sin6;
141         struct sockaddr sa;
142 };
143 
144 struct vxlan_rdst {
145         union vxlan_addr         remote_ip;
146         __be16                   remote_port;
147         __be32                   remote_vni;
148         u32                      remote_ifindex;
149         struct list_head         list;
150         struct rcu_head          rcu;
151         struct dst_cache         dst_cache;
152 };
153 
154 struct vxlan_config {
155         union vxlan_addr        remote_ip;
156         union vxlan_addr        saddr;
157         __be32                  vni;
158         int                     remote_ifindex;
159         int                     mtu;
160         __be16                  dst_port;
161         u16                     port_min;
162         u16                     port_max;
163         u8                      tos;
164         u8                      ttl;
165         __be32                  label;
166         u32                     flags;
167         unsigned long           age_interval;
168         unsigned int            addrmax;
169         bool                    no_share;
170 };
171 
172 /* Pseudo network device */
173 struct vxlan_dev {
174         struct hlist_node hlist;        /* vni hash table */
175         struct list_head  next;         /* vxlan's per namespace list */
176         struct vxlan_sock *vn4_sock;    /* listening socket for IPv4 */
177 #if IS_ENABLED(CONFIG_IPV6)
178         struct vxlan_sock *vn6_sock;    /* listening socket for IPv6 */
179 #endif
180         struct net_device *dev;
181         struct net        *net;         /* netns for packet i/o */
182         struct vxlan_rdst default_dst;  /* default destination */
183         u32               flags;        /* VXLAN_F_* in vxlan.h */
184 
185         struct timer_list age_timer;
186         spinlock_t        hash_lock;
187         unsigned int      addrcnt;
188         struct gro_cells  gro_cells;
189 
190         struct vxlan_config     cfg;
191 
192         struct hlist_head fdb_head[FDB_HASH_SIZE];
193 };
194 
195 #define VXLAN_F_LEARN                   0x01
196 #define VXLAN_F_PROXY                   0x02
197 #define VXLAN_F_RSC                     0x04
198 #define VXLAN_F_L2MISS                  0x08
199 #define VXLAN_F_L3MISS                  0x10
200 #define VXLAN_F_IPV6                    0x20
201 #define VXLAN_F_UDP_ZERO_CSUM_TX        0x40
202 #define VXLAN_F_UDP_ZERO_CSUM6_TX       0x80
203 #define VXLAN_F_UDP_ZERO_CSUM6_RX       0x100
204 #define VXLAN_F_REMCSUM_TX              0x200
205 #define VXLAN_F_REMCSUM_RX              0x400
206 #define VXLAN_F_GBP                     0x800
207 #define VXLAN_F_REMCSUM_NOPARTIAL       0x1000
208 #define VXLAN_F_COLLECT_METADATA        0x2000
209 
210 /* Flags that are used in the receive path. These flags must match in
211  * order for a socket to be shareable
212  */
213 #define VXLAN_F_RCV_FLAGS               (VXLAN_F_GBP |                  \
214                                          VXLAN_F_UDP_ZERO_CSUM6_RX |    \
215                                          VXLAN_F_REMCSUM_RX |           \
216                                          VXLAN_F_REMCSUM_NOPARTIAL |    \
217                                          VXLAN_F_COLLECT_METADATA)
218 
219 struct net_device *vxlan_dev_create(struct net *net, const char *name,
220                                     u8 name_assign_type, struct vxlan_config *conf);
221 
222 static inline __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan,
223                                         unsigned short family)
224 {
225 #if IS_ENABLED(CONFIG_IPV6)
226         if (family == AF_INET6)
227                 return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport;
228 #endif
229         return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport;
230 }
231 
232 static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
233                                                      netdev_features_t features)
234 {
235         u8 l4_hdr = 0;
236 
237         if (!skb->encapsulation)
238                 return features;
239 
240         switch (vlan_get_protocol(skb)) {
241         case htons(ETH_P_IP):
242                 l4_hdr = ip_hdr(skb)->protocol;
243                 break;
244         case htons(ETH_P_IPV6):
245                 l4_hdr = ipv6_hdr(skb)->nexthdr;
246                 break;
247         default:
248                 return features;;
249         }
250 
251         if ((l4_hdr == IPPROTO_UDP) &&
252             (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
253              skb->inner_protocol != htons(ETH_P_TEB) ||
254              (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
255               sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
256              (skb->ip_summed != CHECKSUM_NONE &&
257               !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
258                 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
259 
260         return features;
261 }
262 
263 /* IP header + UDP + VXLAN + Ethernet header */
264 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
265 /* IPv6 header + UDP + VXLAN + Ethernet header */
266 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
267 
268 static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
269 {
270         return (struct vxlanhdr *)(udp_hdr(skb) + 1);
271 }
272 
273 static inline __be32 vxlan_vni(__be32 vni_field)
274 {
275 #if defined(__BIG_ENDIAN)
276         return (__force __be32)((__force u32)vni_field >> 8);
277 #else
278         return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
279 #endif
280 }
281 
282 static inline __be32 vxlan_vni_field(__be32 vni)
283 {
284 #if defined(__BIG_ENDIAN)
285         return (__force __be32)((__force u32)vni << 8);
286 #else
287         return (__force __be32)((__force u32)vni >> 8);
288 #endif
289 }
290 
291 static inline __be32 vxlan_tun_id_to_vni(__be64 tun_id)
292 {
293 #if defined(__BIG_ENDIAN)
294         return (__force __be32)tun_id;
295 #else
296         return (__force __be32)((__force u64)tun_id >> 32);
297 #endif
298 }
299 
300 static inline __be64 vxlan_vni_to_tun_id(__be32 vni)
301 {
302 #if defined(__BIG_ENDIAN)
303         return (__force __be64)vni;
304 #else
305         return (__force __be64)((u64)(__force u32)vni << 32);
306 #endif
307 }
308 
309 static inline size_t vxlan_rco_start(__be32 vni_field)
310 {
311         return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
312 }
313 
314 static inline size_t vxlan_rco_offset(__be32 vni_field)
315 {
316         return (vni_field & VXLAN_RCO_UDP) ?
317                 offsetof(struct udphdr, check) :
318                 offsetof(struct tcphdr, check);
319 }
320 
321 static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
322 {
323         __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
324 
325         if (offset == offsetof(struct udphdr, check))
326                 vni_field |= VXLAN_RCO_UDP;
327         return vni_field;
328 }
329 
330 #if IS_ENABLED(CONFIG_VXLAN)
331 void vxlan_get_rx_port(struct net_device *netdev);
332 #else
333 static inline void vxlan_get_rx_port(struct net_device *netdev)
334 {
335 }
336 #endif
337 
338 static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
339 {
340         return vs->sock->sk->sk_family;
341 }
342 
343 #endif
344 

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