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                         __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 #define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01
  52         union {
  53                 struct {
  54                         __be16  sport;
  55                         __be16  dport;
  56                 } ports;
  57
  58                 struct {
  59                         __u8    type;
  60                         __u8    code;
  61                 } icmpt;
  62
  63                 struct {
  64                         __le16  sport;
  65                         __le16  dport;
  66                 } dnports;
  67
  68                 __be32          spi;
  69
  70                 struct {
  71                         __u8    type;
  72                 } mht;
  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 #define fl_mh_type      uli_u.mht.type
  80         __u32           secid;  /* used by xfrm; see secid.txt */
  81 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  82
  83 #define FLOW_DIR_IN     0
  84 #define FLOW_DIR_OUT    1
  85 #define FLOW_DIR_FWD    2
  86
  87 struct sock;
  88 typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
  89                                void **objp, atomic_t **obj_refp);
  90
  91 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
  92                                flow_resolve_t resolver);
  93 extern void flow_cache_flush(void);
  94 extern atomic_t flow_cache_genid;
  95
  96 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
  97 {
  98         return (fl1->proto == fl2->proto &&
  99                 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
 100 }
 101
 102 #endif