release/src-rt-6.x/linux/linux-2.6/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                         __u32                   lsrc;
  23                         __u32                   gw;
  24                         __u8                    tos;
  25                         __u8                    scope;
  26                 } ip4_u;
  27
  28                 struct {
  29                         struct in6_addr         daddr;
  30                         struct in6_addr         saddr;
  31                         __be32                  flowlabel;
  32                 } ip6_u;
  33
  34                 struct {
  35                         __le16                  daddr;
  36                         __le16                  saddr;
  37                         __u8                    scope;
  38                 } dn_u;
  39         } nl_u;
  40 #define fld_dst         nl_u.dn_u.daddr
  41 #define fld_src         nl_u.dn_u.saddr
  42 #define fld_scope       nl_u.dn_u.scope
  43 #define fl6_dst         nl_u.ip6_u.daddr
  44 #define fl6_src         nl_u.ip6_u.saddr
  45 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  46 #define fl4_dst         nl_u.ip4_u.daddr
  47 #define fl4_src         nl_u.ip4_u.saddr
  48 #define fl4_lsrc        nl_u.ip4_u.lsrc
  49 #define fl4_gw          nl_u.ip4_u.gw
  50 #define fl4_tos         nl_u.ip4_u.tos
  51 #define fl4_scope       nl_u.ip4_u.scope
  52
  53         __u8    proto;
  54         __u8    flags;
  55 #define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01
  56         union {
  57                 struct {
  58                         __be16  sport;
  59                         __be16  dport;
  60                 } ports;
  61
  62                 struct {
  63                         __u8    type;
  64                         __u8    code;
  65                 } icmpt;
  66
  67                 struct {
  68                         __le16  sport;
  69                         __le16  dport;
  70                 } dnports;
  71
  72                 __be32          spi;
  73
  74 #ifdef CONFIG_IPV6_MIP6
  75                 struct {
  76                         __u8    type;
  77                 } mht;
  78 #endif
  79         } uli_u;
  80 #define fl_ip_sport     uli_u.ports.sport
  81 #define fl_ip_dport     uli_u.ports.dport
  82 #define fl_icmp_type    uli_u.icmpt.type
  83 #define fl_icmp_code    uli_u.icmpt.code
  84 #define fl_ipsec_spi    uli_u.spi
  85 #ifdef CONFIG_IPV6_MIP6
  86 #define fl_mh_type      uli_u.mht.type
  87 #endif
  88         __u32           secid;  /* used by xfrm; see secid.txt */
  89 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  90
  91 #define FLOW_DIR_IN     0
  92 #define FLOW_DIR_OUT    1
  93 #define FLOW_DIR_FWD    2
  94
  95 struct sock;
  96 typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
  97                                void **objp, atomic_t **obj_refp);
  98
  99 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
 100                                flow_resolve_t resolver);
 101 extern void flow_cache_flush(void);
 102 extern atomic_t flow_cache_genid;
 103
 104 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
 105 {
 106         return (fl1->proto == fl2->proto &&
 107                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
 108 }
 109
 110 #endif