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
  17         union {
  18                 struct {
  19                         __be32                  daddr;
  20                         __be32                  saddr;
  21                         __u32                   fwmark;
  22                         __u8                    tos;
  23                         __u8                    scope;
  24                 } ip4_u;
  25
  26                 struct {
  27                         struct in6_addr         daddr;
  28                         struct in6_addr         saddr;
  29                         __u32                   fwmark;
  30                         __u32                   flowlabel;
  31                 } ip6_u;
  32
  33                 struct {
  34                         __le16                  daddr;
  35                         __le16                  saddr;
  36                         __u32                   fwmark;
  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_fwmark      nl_u.dn_u.fwmark
  43 #define fld_scope       nl_u.dn_u.scope
  44 #define fl6_dst         nl_u.ip6_u.daddr
  45 #define fl6_src         nl_u.ip6_u.saddr
  46 #define fl6_fwmark      nl_u.ip6_u.fwmark
  47 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  48 #define fl4_dst         nl_u.ip4_u.daddr
  49 #define fl4_src         nl_u.ip4_u.saddr
  50 #define fl4_fwmark      nl_u.ip4_u.fwmark
  51 #define fl4_tos         nl_u.ip4_u.tos
  52 #define fl4_scope       nl_u.ip4_u.scope
  53
  54         __u8    proto;
  55         __u8    flags;
  56 #define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01
  57         union {
  58                 struct {
  59                         __be16  sport;
  60                         __be16  dport;
  61                 } ports;
  62
  63                 struct {
  64                         __u8    type;
  65                         __u8    code;
  66                 } icmpt;
  67
  68                 struct {
  69                         __le16  sport;
  70                         __le16  dport;
  71                         __u8    objnum;
  72                         __u8    objnamel; /* Not 16 bits since max val is 16 */
  73                         __u8    objname[16]; /* Not zero terminated */
  74                 } dnports;
  75
  76                 __be32          spi;
  77
  78 #ifdef CONFIG_IPV6_MIP6
  79                 struct {
  80                         __u8    type;
  81                 } mht;
  82 #endif
  83         } uli_u;
  84 #define fl_ip_sport     uli_u.ports.sport
  85 #define fl_ip_dport     uli_u.ports.dport
  86 #define fl_icmp_type    uli_u.icmpt.type
  87 #define fl_icmp_code    uli_u.icmpt.code
  88 #define fl_ipsec_spi    uli_u.spi
  89 #ifdef CONFIG_IPV6_MIP6
  90 #define fl_mh_type      uli_u.mht.type
  91 #endif
  92         __u32           secid;  /* used by xfrm; see secid.txt */
  93 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  94
  95 #define FLOW_DIR_IN     0
  96 #define FLOW_DIR_OUT    1
  97 #define FLOW_DIR_FWD    2
  98
  99 struct sock;
 100 typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
 101                                void **objp, atomic_t **obj_refp);
 102
 103 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
 104                                flow_resolve_t resolver);
 105 extern void flow_cache_flush(void);
 106 extern atomic_t flow_cache_genid;
 107
 108 #endif