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_MATCH_ANY_IIF 0x02
  53         union {
  54                 struct {
  55                         __be16  sport;
  56                         __be16  dport;
  57                 } ports;
  58
  59                 struct {
  60                         __u8    type;
  61                         __u8    code;
  62                 } icmpt;
  63
  64                 struct {
  65                         __le16  sport;
  66                         __le16  dport;
  67                 } dnports;
  68
  69                 __be32          spi;
  70
  71                 struct {
  72                         __u8    type;
  73                 } mht;
  74         } uli_u;
  75 #define fl_ip_sport     uli_u.ports.sport
  76 #define fl_ip_dport     uli_u.ports.dport
  77 #define fl_icmp_type    uli_u.icmpt.type
  78 #define fl_icmp_code    uli_u.icmpt.code
  79 #define fl_ipsec_spi    uli_u.spi
  80 #define fl_mh_type      uli_u.mht.type
  81         __u32           secid;  /* used by xfrm; see secid.txt */
  82 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  83
  84 #define FLOW_DIR_IN     0
  85 #define FLOW_DIR_OUT    1
  86 #define FLOW_DIR_FWD    2
  87
  88 struct net;
  89 struct sock;
  90 struct flow_cache_ops;
  91
  92 struct flow_cache_object {
  93         const struct flow_cache_ops *ops;
  94 };
  95
  96 struct flow_cache_ops {
  97         struct flow_cache_object *(*get)(struct flow_cache_object *);
  98         int (*check)(struct flow_cache_object *);
  99         void (*delete)(struct flow_cache_object *);
 100 };
 101
 102 typedef struct flow_cache_object *(*flow_resolve_t)(
 103                 struct net *net, struct flowi *key, u16 family,
 104                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 105
 106 extern struct flow_cache_object *flow_cache_lookup(
 107                 struct net *net, struct flowi *key, u16 family,
 108                 u8 dir, flow_resolve_t resolver, void *ctx);
 109
 110 extern void flow_cache_flush(void);
 111 extern atomic_t flow_cache_genid;
 112
 113 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
 114 {
 115         return (fl1->proto == fl2->proto &&
 116                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
 117 }
 118
 119 #endif