include/net/flow_keys.h

   1 #ifndef _NET_FLOW_KEYS_H
   2 #define _NET_FLOW_KEYS_H
   3
   4 /* struct flow_keys:
   5  *      @src: source ip address in case of IPv4
   6  *            For IPv6 it contains 32bit hash of src address
   7  *      @dst: destination ip address in case of IPv4
   8  *            For IPv6 it contains 32bit hash of dst address
   9  *      @ports: port numbers of Transport header
  10  *              port16[0]: src port number
  11  *              port16[1]: dst port number
  12  *      @thoff: Transport header offset
  13  *      @n_proto: Network header protocol (eg. IPv4/IPv6)
  14  *      @ip_proto: Transport header protocol (eg. TCP/UDP)
  15  * All the members, except thoff, are in network byte order.
  16  */
  17 struct flow_keys {
  18         /* (src,dst) must be grouped, in the same way than in IP header */
  19         __be32 src;
  20         __be32 dst;
  21         union {
  22                 __be32 ports;
  23                 __be16 port16[2];
  24         };
  25         u16 thoff;
  26         u16 n_proto;
  27         u8 ip_proto;
  28 };
  29
  30 bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
  31                         void *data, __be16 proto, int nhoff, int hlen);
  32 static inline bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
  33 {
  34         return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0);
  35 }
  36 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
  37                             void *data, int hlen_proto);
  38 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto)
  39 {
  40         return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
  41 }
  42 u32 flow_hash_from_keys(struct flow_keys *keys);
  43 unsigned int flow_get_hlen(const unsigned char *data, unsigned int max_len,
  44                            __be16 protocol);
  45 #endif