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_common {
  14         int     flowic_oif;
  15         int     flowic_iif;
  16         __u32   flowic_mark;
  17         __u8    flowic_tos;
  18         __u8    flowic_scope;
  19         __u8    flowic_proto;
  20         __u8    flowic_flags;
  21 #define FLOWI_FLAG_ANYSRC               0x01
  22 #define FLOWI_FLAG_PRECOW_METRICS       0x02
  23 #define FLOWI_FLAG_CAN_SLEEP            0x04
  24         __u32   flowic_secid;
  25 };
  26
  27 union flowi_uli {
  28         struct {
  29                 __be16  sport;
  30                 __be16  dport;
  31         } ports;
  32
  33         struct {
  34                 __u8    type;
  35                 __u8    code;
  36         } icmpt;
  37
  38         struct {
  39                 __le16  sport;
  40                 __le16  dport;
  41         } dnports;
  42
  43         __be32          spi;
  44         __be32          gre_key;
  45
  46         struct {
  47                 __u8    type;
  48         } mht;
  49 };
  50
  51 struct flowi4 {
  52         struct flowi_common     __fl_common;
  53         __be32                  daddr;
  54         __be32                  saddr;
  55         union flowi_uli         uli;
  56 };
  57
  58 struct flowi6 {
  59         struct flowi_common     __fl_common;
  60         struct in6_addr         daddr;
  61         struct in6_addr         saddr;
  62         __be32                  flowlabel;
  63         union flowi_uli         uli;
  64 };
  65
  66 struct flowidn {
  67         struct flowi_common     __fl_common;
  68         __le16                  daddr;
  69         __le16                  saddr;
  70         union flowi_uli         uli;
  71 };
  72
  73 struct flowi {
  74         union {
  75                 struct flowi_common     __fl_common;
  76                 struct flowi4           ip4;
  77                 struct flowi6           ip6;
  78                 struct flowidn          dn;
  79         } u;
  80 #define flowi_oif       u.__fl_common.flowic_oif
  81 #define flowi_iif       u.__fl_common.flowic_iif
  82 #define flowi_mark      u.__fl_common.flowic_mark
  83 #define flowi_tos       u.__fl_common.flowic_tos
  84 #define flowi_scope     u.__fl_common.flowic_scope
  85 #define flowi_proto     u.__fl_common.flowic_proto
  86 #define flowi_flags     u.__fl_common.flowic_flags
  87 #define flowi_secid     u.__fl_common.flowic_secid
  88 #define fl4_tos         flowi_tos
  89 #define fl4_scope       flowi_scope
  90 #define fld_scope       flowi_scope
  91
  92 #define fld_dst         u.dn.daddr
  93 #define fld_src         u.dn.saddr
  94 #define fl6_dst         u.ip6.daddr
  95 #define fl6_src         u.ip6.saddr
  96 #define fl6_flowlabel   u.ip6.flowlabel
  97 #define fl4_dst         u.ip4.daddr
  98 #define fl4_src         u.ip4.saddr
  99 #define fl4_sport       u.ip4.uli.ports.sport
 100 #define fl4_dport       u.ip4.uli.ports.dport
 101 #define fl4_icmp_type   u.ip4.uli.icmpt.type
 102 #define fl4_icmp_code   u.ip4.uli.icmpt.code
 103 #define fl4_ipsec_spi   u.ip4.uli.spi
 104 #define fl4_mh_type     u.ip4.uli.mht.type
 105 #define fl4_gre_key     u.ip4.uli.gre_key
 106 #define fl6_sport       u.ip6.uli.ports.sport
 107 #define fl6_dport       u.ip6.uli.ports.dport
 108 #define fl6_icmp_type   u.ip6.uli.icmpt.type
 109 #define fl6_icmp_code   u.ip6.uli.icmpt.code
 110 #define fl6_ipsec_spi   u.ip6.uli.spi
 111 #define fl6_mh_type     u.ip6.uli.mht.type
 112 #define fl6_gre_key     u.ip6.uli.gre_key
 113 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 114
 115 #define FLOW_DIR_IN     0
 116 #define FLOW_DIR_OUT    1
 117 #define FLOW_DIR_FWD    2
 118
 119 struct net;
 120 struct sock;
 121 struct flow_cache_ops;
 122
 123 struct flow_cache_object {
 124         const struct flow_cache_ops *ops;
 125 };
 126
 127 struct flow_cache_ops {
 128         struct flow_cache_object *(*get)(struct flow_cache_object *);
 129         int (*check)(struct flow_cache_object *);
 130         void (*delete)(struct flow_cache_object *);
 131 };
 132
 133 typedef struct flow_cache_object *(*flow_resolve_t)(
 134                 struct net *net, const struct flowi *key, u16 family,
 135                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 136
 137 extern struct flow_cache_object *flow_cache_lookup(
 138                 struct net *net, const struct flowi *key, u16 family,
 139                 u8 dir, flow_resolve_t resolver, void *ctx);
 140
 141 extern void flow_cache_flush(void);
 142 extern atomic_t flow_cache_genid;
 143
 144 #endif