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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         __u32   mark;
  17
  18         union {
  19                 struct {
  20                         __be32                  daddr;
  21                         __be32                  saddr;
  22                         __u8                    tos;
  23                         __u8                    scope;
  24                 } ip4_u;
  25
  26                 struct {
  27                         struct in6_addr         daddr;
  28                         struct in6_addr         saddr;
  29                         __be32                  flowlabel;
  30                 } ip6_u;
  31
  32                 struct {
  33                         __le16                  daddr;
  34                         __le16                  saddr;
  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_scope       nl_u.dn_u.scope
  41 #define fl6_dst         nl_u.ip6_u.daddr
  42 #define fl6_src         nl_u.ip6_u.saddr
  43 #define fl6_flowlabel   nl_u.ip6_u.flowlabel
  44 #define fl4_dst         nl_u.ip4_u.daddr
  45 #define fl4_src         nl_u.ip4_u.saddr
  46 #define fl4_tos         nl_u.ip4_u.tos
  47 #define fl4_scope       nl_u.ip4_u.scope
  48
  49         __u8    proto;
  50         __u8    flags;
  51         union {
  52                 struct {
  53                         __be16  sport;
  54                         __be16  dport;
  55                 } ports;
  56
  57                 struct {
  58                         __u8    type;
  59                         __u8    code;
  60                 } icmpt;
  61
  62                 struct {
  63                         __le16  sport;
  64                         __le16  dport;
  65                 } dnports;
  66
  67                 __be32          spi;
  68
  69                 struct {
  70                         __u8    type;
  71                 } mht;
  72         } uli_u;
  73 #define fl_ip_sport     uli_u.ports.sport
  74 #define fl_ip_dport     uli_u.ports.dport
  75 #define fl_icmp_type    uli_u.icmpt.type
  76 #define fl_icmp_code    uli_u.icmpt.code
  77 #define fl_ipsec_spi    uli_u.spi
  78 #define fl_mh_type      uli_u.mht.type
  79         __u32           secid;  /* used by xfrm; see secid.txt */
  80 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  81
  82 #define FLOW_DIR_IN     0
  83 #define FLOW_DIR_OUT    1
  84 #define FLOW_DIR_FWD    2
  85
  86 struct sock;
  87 typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
  88                                void **objp, atomic_t **obj_refp);
  89
  90 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
  91                                flow_resolve_t resolver);
  92 extern void flow_cache_flush(void);
  93 extern atomic_t flow_cache_genid;
  94
  95 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
  96 {
  97         return (fl1->proto == fl2->proto &&
  98                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
  99 }
 100
 101 #endif