include/net/flow.h

   1 /*
   2  *
   3  *      Generic internet FLOW.
   4  *
   5  */
   6
   7 #ifndef _NET_FLOW_H
   8 #define _NET_FLOW_H
   9
  10 #include <linux/in6.h>
  11 #include <asm/atomic.h>
  12
  13 struct flowi {
  14         int     oif;
  15         int     iif;
  16         __u32   mark;
  17
  18         union {
  19                 struct {
  20                         __be32                  daddr;
  21                         __be32                  saddr;
  22                         __u8                    tos;
  23                         __u8                    scope;
  24                 } ip4_u;
  25
  26                 struct {
  27                         struct in6_addr         daddr;
  28                         struct in6_addr         saddr;
  29                         __be32                  flowlabel;
  30                 } ip6_u;
  31
  32                 struct {
  33                         __le16                  daddr;
  34                         __le16                  saddr;
  35                         __u8                    scope;
  36                 } dn_u;
  37         } nl_u;
  38 #define fld_dst         nl_u.dn_u.daddr
  39 #define fld_src         nl_u.dn_u.saddr
  40 #define fld_scope       nl_u.dn_u.scope
  41 #define fl6_dst         nl_u.ip6_u.daddr
  42 #define fl6_src         nl_u.ip6_u.saddr
  43 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  44 #define fl4_dst         nl_u.ip4_u.daddr
  45 #define fl4_src         nl_u.ip4_u.saddr
  46 #define fl4_tos         nl_u.ip4_u.tos
  47 #define fl4_scope       nl_u.ip4_u.scope
  48
  49         __u8    proto;
  50         __u8    flags;
  51 #define FLOWI_FLAG_ANYSRC               0x01
  52 #define FLOWI_FLAG_PRECOW_METRICS       0x02
  53 #define FLOWI_FLAG_CAN_SLEEP            0x04
  54         union {
  55                 struct {
  56                         __be16  sport;
  57                         __be16  dport;
  58                 } ports;
  59
  60                 struct {
  61                         __u8    type;
  62                         __u8    code;
  63                 } icmpt;
  64
  65                 struct {
  66                         __le16  sport;
  67                         __le16  dport;
  68                 } dnports;
  69
  70                 __be32          spi;
  71                 __be32          gre_key;
  72
  73                 struct {
  74                         __u8    type;
  75                 } mht;
  76         } uli_u;
  77 #define fl_ip_sport     uli_u.ports.sport
  78 #define fl_ip_dport     uli_u.ports.dport
  79 #define fl_icmp_type    uli_u.icmpt.type
  80 #define fl_icmp_code    uli_u.icmpt.code
  81 #define fl_ipsec_spi    uli_u.spi
  82 #define fl_mh_type      uli_u.mht.type
  83 #define fl_gre_key      uli_u.gre_key
  84         __u32           secid;  /* used by xfrm; see secid.txt */
  85 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  86
  87 #define FLOW_DIR_IN     0
  88 #define FLOW_DIR_OUT    1
  89 #define FLOW_DIR_FWD    2
  90
  91 struct net;
  92 struct sock;
  93 struct flow_cache_ops;
  94
  95 struct flow_cache_object {
  96         const struct flow_cache_ops *ops;
  97 };
  98
  99 struct flow_cache_ops {
 100         struct flow_cache_object *(*get)(struct flow_cache_object *);
 101         int (*check)(struct flow_cache_object *);
 102         void (*delete)(struct flow_cache_object *);
 103 };
 104
 105 typedef struct flow_cache_object *(*flow_resolve_t)(
 106                 struct net *net, const struct flowi *key, u16 family,
 107                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 108
 109 extern struct flow_cache_object *flow_cache_lookup(
 110                 struct net *net, const struct flowi *key, u16 family,
 111                 u8 dir, flow_resolve_t resolver, void *ctx);
 112
 113 extern void flow_cache_flush(void);
 114 extern atomic_t flow_cache_genid;
 115
 116 static inline int flow_cache_uli_match(const struct flowi *fl1,
 117                                        const struct flowi *fl2)
 118 {
 119         return (fl1->proto == fl2->proto &&
 120                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
 121 }
 122
 123 #endif