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 struct flowi {
  28         struct flowi_common     __fl_common;
  29 #define flowi_oif               __fl_common.flowic_oif
  30 #define flowi_iif               __fl_common.flowic_iif
  31 #define flowi_mark              __fl_common.flowic_mark
  32 #define flowi_tos               __fl_common.flowic_tos
  33 #define flowi_scope             __fl_common.flowic_scope
  34 #define flowi_proto             __fl_common.flowic_proto
  35 #define flowi_flags             __fl_common.flowic_flags
  36 #define flowi_secid             __fl_common.flowic_secid
  37
  38         union {
  39                 struct {
  40                         __be32                  daddr;
  41                         __be32                  saddr;
  42                 } ip4_u;
  43
  44                 struct {
  45                         struct in6_addr         daddr;
  46                         struct in6_addr         saddr;
  47                         __be32                  flowlabel;
  48                 } ip6_u;
  49
  50                 struct {
  51                         __le16                  daddr;
  52                         __le16                  saddr;
  53                         __u8                    scope;
  54                 } dn_u;
  55         } nl_u;
  56 #define fld_dst         nl_u.dn_u.daddr
  57 #define fld_src         nl_u.dn_u.saddr
  58 #define fld_scope       nl_u.dn_u.scope
  59 #define fl6_dst         nl_u.ip6_u.daddr
  60 #define fl6_src         nl_u.ip6_u.saddr
  61 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  62 #define fl4_dst         nl_u.ip4_u.daddr
  63 #define fl4_src         nl_u.ip4_u.saddr
  64 #define fl4_tos         flowi_tos
  65 #define fl4_scope       flowi_scope
  66
  67         union {
  68                 struct {
  69                         __be16  sport;
  70                         __be16  dport;
  71                 } ports;
  72
  73                 struct {
  74                         __u8    type;
  75                         __u8    code;
  76                 } icmpt;
  77
  78                 struct {
  79                         __le16  sport;
  80                         __le16  dport;
  81                 } dnports;
  82
  83                 __be32          spi;
  84                 __be32          gre_key;
  85
  86                 struct {
  87                         __u8    type;
  88                 } mht;
  89         } uli_u;
  90 #define fl_ip_sport     uli_u.ports.sport
  91 #define fl_ip_dport     uli_u.ports.dport
  92 #define fl_icmp_type    uli_u.icmpt.type
  93 #define fl_icmp_code    uli_u.icmpt.code
  94 #define fl_ipsec_spi    uli_u.spi
  95 #define fl_mh_type      uli_u.mht.type
  96 #define fl_gre_key      uli_u.gre_key
  97 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  98
  99 #define FLOW_DIR_IN     0
 100 #define FLOW_DIR_OUT    1
 101 #define FLOW_DIR_FWD    2
 102
 103 struct net;
 104 struct sock;
 105 struct flow_cache_ops;
 106
 107 struct flow_cache_object {
 108         const struct flow_cache_ops *ops;
 109 };
 110
 111 struct flow_cache_ops {
 112         struct flow_cache_object *(*get)(struct flow_cache_object *);
 113         int (*check)(struct flow_cache_object *);
 114         void (*delete)(struct flow_cache_object *);
 115 };
 116
 117 typedef struct flow_cache_object *(*flow_resolve_t)(
 118                 struct net *net, const struct flowi *key, u16 family,
 119                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 120
 121 extern struct flow_cache_object *flow_cache_lookup(
 122                 struct net *net, const struct flowi *key, u16 family,
 123                 u8 dir, flow_resolve_t resolver, void *ctx);
 124
 125 extern void flow_cache_flush(void);
 126 extern atomic_t flow_cache_genid;
 127
 128 static inline int flow_cache_uli_match(const struct flowi *fl1,
 129                                        const struct flowi *fl2)
 130 {
 131         return (fl1->flowi_proto == fl2->flowi_proto &&
 132                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
 133 }
 134
 135 #endif