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   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                         __u32                   daddr;
  20                         __u32                   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                   flowlabel;
  30                 } ip6_u;
  31
  32                 struct {
  33                         __le16                  daddr;
  34                         __le16                  saddr;
  35                         __u32                   fwmark;
  36                         __u8                    scope;
  37                 } dn_u;
  38         } nl_u;
  39 #define fld_dst         nl_u.dn_u.daddr
  40 #define fld_src         nl_u.dn_u.saddr
  41 #define fld_fwmark      nl_u.dn_u.fwmark
  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_fwmark      nl_u.ip4_u.fwmark
  49 #define fl4_tos         nl_u.ip4_u.tos
  50 #define fl4_scope       nl_u.ip4_u.scope
  51
  52         __u8    proto;
  53         __u8    flags;
  54 #define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01
  55         union {
  56                 struct {
  57                         __u16   sport;
  58                         __u16   dport;
  59                 } ports;
  60
  61                 struct {
  62                         __u8    type;
  63                         __u8    code;
  64                 } icmpt;
  65
  66                 struct {
  67                         __le16  sport;
  68                         __le16  dport;
  69                         __u8    objnum;
  70                         __u8    objnamel; /* Not 16 bits since max val is 16 */
  71                         __u8    objname[16]; /* Not zero terminated */
  72                 } dnports;
  73
  74                 __u32           spi;
  75         } uli_u;
  76 #define fl_ip_sport     uli_u.ports.sport
  77 #define fl_ip_dport     uli_u.ports.dport
  78 #define fl_icmp_type    uli_u.icmpt.type
  79 #define fl_icmp_code    uli_u.icmpt.code
  80 #define fl_ipsec_spi    uli_u.spi
  81         __u32           secid;  /* used by xfrm; see secid.txt */
  82 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  83
  84 #define FLOW_DIR_IN     0
  85 #define FLOW_DIR_OUT    1
  86 #define FLOW_DIR_FWD    2
  87
  88 struct sock;
  89 typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
  90                                void **objp, atomic_t **obj_refp);
  91
  92 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
  93                                flow_resolve_t resolver);
  94 extern void flow_cache_flush(void);
  95 extern atomic_t flow_cache_genid;
  96
  97 #endif