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
  12 struct flowi {
  13         int     oif;
  14         int     iif;
  15
  16         union {
  17                 struct {
  18                         __u32                   daddr;
  19                         __u32                   saddr;
  20                         __u32                   fwmark;
  21                         __u8                    tos;
  22                         __u8                    scope;
  23                 } ip4_u;
  24
  25                 struct {
  26                         struct in6_addr         daddr;
  27                         struct in6_addr         saddr;
  28                         __u32                   flowlabel;
  29                 } ip6_u;
  30
  31                 struct {
  32                         __u16                   daddr;
  33                         __u16                   saddr;
  34                         __u32                   fwmark;
  35                         __u8                    scope;
  36                 } dn_u;
  37         } nl_u;
  38 #define fld_dst         nl_u.dn_u.daddr
  39 #define fld_src         nl_u.dn_u.saddr
  40 #define fld_fwmark      nl_u.dn_u.fwmark
  41 #define fld_scope       nl_u.dn_u.scope
  42 #define fl6_dst         nl_u.ip6_u.daddr
  43 #define fl6_src         nl_u.ip6_u.saddr
  44 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  45 #define fl4_dst         nl_u.ip4_u.daddr
  46 #define fl4_src         nl_u.ip4_u.saddr
  47 #define fl4_fwmark      nl_u.ip4_u.fwmark
  48 #define fl4_tos         nl_u.ip4_u.tos
  49 #define fl4_scope       nl_u.ip4_u.scope
  50
  51         __u8    proto;
  52         __u8    flags;
  53         union {
  54                 struct {
  55                         __u16   sport;
  56                         __u16   dport;
  57                 } ports;
  58
  59                 struct {
  60                         __u8    type;
  61                         __u8    code;
  62                 } icmpt;
  63
  64                 struct {
  65                         __u16   sport;
  66                         __u16   dport;
  67                         __u8    objnum;
  68                         __u8    objnamel; /* Not 16 bits since max val is 16 */
  69                         __u8    objname[16]; /* Not zero terminated */
  70                 } dnports;
  71
  72                 __u32           spi;
  73         } uli_u;
  74 #define fl_ip_sport     uli_u.ports.sport
  75 #define fl_ip_dport     uli_u.ports.dport
  76 #define fl_icmp_type    uli_u.icmpt.type
  77 #define fl_icmp_code    uli_u.icmpt.code
  78 #define fl_ipsec_spi    uli_u.spi
  79 };
  80
  81 #define FLOW_DIR_IN     0
  82 #define FLOW_DIR_OUT    1
  83 #define FLOW_DIR_FWD    2
  84
  85 typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
  86                                void **objp, atomic_t **obj_refp);
  87
  88 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
  89                                flow_resolve_t resolver);
  90 extern void flow_cache_flush(void);
  91 extern atomic_t flow_cache_genid;
  92
  93 #endif