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 flowi {
  52         struct flowi_common     __fl_common;
  53 #define flowi_oif               __fl_common.flowic_oif
  54 #define flowi_iif               __fl_common.flowic_iif
  55 #define flowi_mark              __fl_common.flowic_mark
  56 #define flowi_tos               __fl_common.flowic_tos
  57 #define flowi_scope             __fl_common.flowic_scope
  58 #define flowi_proto             __fl_common.flowic_proto
  59 #define flowi_flags             __fl_common.flowic_flags
  60 #define flowi_secid             __fl_common.flowic_secid
  61
  62         union {
  63                 struct {
  64                         __be32                  daddr;
  65                         __be32                  saddr;
  66                 } ip4_u;
  67
  68                 struct {
  69                         struct in6_addr         daddr;
  70                         struct in6_addr         saddr;
  71                         __be32                  flowlabel;
  72                 } ip6_u;
  73
  74                 struct {
  75                         __le16                  daddr;
  76                         __le16                  saddr;
  77                         __u8                    scope;
  78                 } dn_u;
  79         } nl_u;
  80 #define fld_dst         nl_u.dn_u.daddr
  81 #define fld_src         nl_u.dn_u.saddr
  82 #define fld_scope       nl_u.dn_u.scope
  83 #define fl6_dst         nl_u.ip6_u.daddr
  84 #define fl6_src         nl_u.ip6_u.saddr
  85 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  86 #define fl4_dst         nl_u.ip4_u.daddr
  87 #define fl4_src         nl_u.ip4_u.saddr
  88 #define fl4_tos         flowi_tos
  89 #define fl4_scope       flowi_scope
  90
  91         union flowi_uli uli_u;
  92 #define fl_ip_sport     uli_u.ports.sport
  93 #define fl_ip_dport     uli_u.ports.dport
  94 #define fl_icmp_type    uli_u.icmpt.type
  95 #define fl_icmp_code    uli_u.icmpt.code
  96 #define fl_ipsec_spi    uli_u.spi
  97 #define fl_mh_type      uli_u.mht.type
  98 #define fl_gre_key      uli_u.gre_key
  99 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 100
 101 #define FLOW_DIR_IN     0
 102 #define FLOW_DIR_OUT    1
 103 #define FLOW_DIR_FWD    2
 104
 105 struct net;
 106 struct sock;
 107 struct flow_cache_ops;
 108
 109 struct flow_cache_object {
 110         const struct flow_cache_ops *ops;
 111 };
 112
 113 struct flow_cache_ops {
 114         struct flow_cache_object *(*get)(struct flow_cache_object *);
 115         int (*check)(struct flow_cache_object *);
 116         void (*delete)(struct flow_cache_object *);
 117 };
 118
 119 typedef struct flow_cache_object *(*flow_resolve_t)(
 120                 struct net *net, const struct flowi *key, u16 family,
 121                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 122
 123 extern struct flow_cache_object *flow_cache_lookup(
 124                 struct net *net, const struct flowi *key, u16 family,
 125                 u8 dir, flow_resolve_t resolver, void *ctx);
 126
 127 extern void flow_cache_flush(void);
 128 extern atomic_t flow_cache_genid;
 129
 130 static inline int flow_cache_uli_match(const struct flowi *fl1,
 131                                        const struct flowi *fl2)
 132 {
 133         return (fl1->flowi_proto == fl2->flowi_proto &&
 134                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
 135 }
 136
 137 #endif