linux/include/net/flow.h
<<
>>
Prefs
   1/*
   2 *
   3 *      Generic internet FLOW.
   4 *
   5 */
   6
   7#ifndef _NET_FLOW_H
   8#define _NET_FLOW_H
   9
  10#include <linux/socket.h>
  11#include <linux/in6.h>
  12#include <linux/atomic.h>
  13
  14struct flowi_common {
  15        int     flowic_oif;
  16        int     flowic_iif;
  17        __u32   flowic_mark;
  18        __u8    flowic_tos;
  19        __u8    flowic_scope;
  20        __u8    flowic_proto;
  21        __u8    flowic_flags;
  22#define FLOWI_FLAG_ANYSRC               0x01
  23#define FLOWI_FLAG_CAN_SLEEP            0x02
  24        __u32   flowic_secid;
  25};
  26
  27union flowi_uli {
  28        struct {
  29                __be16  dport;
  30                __be16  sport;
  31        } ports;
  32
  33        struct {
  34                __u8    type;
  35                __u8    code;
  36        } icmpt;
  37
  38        struct {
  39                __le16  dport;
  40                __le16  sport;
  41        } dnports;
  42
  43        __be32          spi;
  44        __be32          gre_key;
  45
  46        struct {
  47                __u8    type;
  48        } mht;
  49};
  50
  51struct flowi4 {
  52        struct flowi_common     __fl_common;
  53#define flowi4_oif              __fl_common.flowic_oif
  54#define flowi4_iif              __fl_common.flowic_iif
  55#define flowi4_mark             __fl_common.flowic_mark
  56#define flowi4_tos              __fl_common.flowic_tos
  57#define flowi4_scope            __fl_common.flowic_scope
  58#define flowi4_proto            __fl_common.flowic_proto
  59#define flowi4_flags            __fl_common.flowic_flags
  60#define flowi4_secid            __fl_common.flowic_secid
  61
  62        /* (saddr,daddr) must be grouped, same order as in IP header */
  63        __be32                  saddr;
  64        __be32                  daddr;
  65
  66        union flowi_uli         uli;
  67#define fl4_sport               uli.ports.sport
  68#define fl4_dport               uli.ports.dport
  69#define fl4_icmp_type           uli.icmpt.type
  70#define fl4_icmp_code           uli.icmpt.code
  71#define fl4_ipsec_spi           uli.spi
  72#define fl4_mh_type             uli.mht.type
  73#define fl4_gre_key             uli.gre_key
  74} __attribute__((__aligned__(BITS_PER_LONG/8)));
  75
  76static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  77                                      __u32 mark, __u8 tos, __u8 scope,
  78                                      __u8 proto, __u8 flags,
  79                                      __be32 daddr, __be32 saddr,
  80                                      __be16 dport, __be16 sport)
  81{
  82        fl4->flowi4_oif = oif;
  83        fl4->flowi4_iif = 0;
  84        fl4->flowi4_mark = mark;
  85        fl4->flowi4_tos = tos;
  86        fl4->flowi4_scope = scope;
  87        fl4->flowi4_proto = proto;
  88        fl4->flowi4_flags = flags;
  89        fl4->flowi4_secid = 0;
  90        fl4->daddr = daddr;
  91        fl4->saddr = saddr;
  92        fl4->fl4_dport = dport;
  93        fl4->fl4_sport = sport;
  94}
  95
  96/* Reset some input parameters after previous lookup */
  97static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
  98                                        __be32 daddr, __be32 saddr)
  99{
 100        fl4->flowi4_oif = oif;
 101        fl4->flowi4_tos = tos;
 102        fl4->daddr = daddr;
 103        fl4->saddr = saddr;
 104}
 105                                      
 106
 107struct flowi6 {
 108        struct flowi_common     __fl_common;
 109#define flowi6_oif              __fl_common.flowic_oif
 110#define flowi6_iif              __fl_common.flowic_iif
 111#define flowi6_mark             __fl_common.flowic_mark
 112#define flowi6_tos              __fl_common.flowic_tos
 113#define flowi6_scope            __fl_common.flowic_scope
 114#define flowi6_proto            __fl_common.flowic_proto
 115#define flowi6_flags            __fl_common.flowic_flags
 116#define flowi6_secid            __fl_common.flowic_secid
 117        struct in6_addr         daddr;
 118        struct in6_addr         saddr;
 119        __be32                  flowlabel;
 120        union flowi_uli         uli;
 121#define fl6_sport               uli.ports.sport
 122#define fl6_dport               uli.ports.dport
 123#define fl6_icmp_type           uli.icmpt.type
 124#define fl6_icmp_code           uli.icmpt.code
 125#define fl6_ipsec_spi           uli.spi
 126#define fl6_mh_type             uli.mht.type
 127#define fl6_gre_key             uli.gre_key
 128} __attribute__((__aligned__(BITS_PER_LONG/8)));
 129
 130struct flowidn {
 131        struct flowi_common     __fl_common;
 132#define flowidn_oif             __fl_common.flowic_oif
 133#define flowidn_iif             __fl_common.flowic_iif
 134#define flowidn_mark            __fl_common.flowic_mark
 135#define flowidn_scope           __fl_common.flowic_scope
 136#define flowidn_proto           __fl_common.flowic_proto
 137#define flowidn_flags           __fl_common.flowic_flags
 138        __le16                  daddr;
 139        __le16                  saddr;
 140        union flowi_uli         uli;
 141#define fld_sport               uli.ports.sport
 142#define fld_dport               uli.ports.dport
 143} __attribute__((__aligned__(BITS_PER_LONG/8)));
 144
 145struct flowi {
 146        union {
 147                struct flowi_common     __fl_common;
 148                struct flowi4           ip4;
 149                struct flowi6           ip6;
 150                struct flowidn          dn;
 151        } u;
 152#define flowi_oif       u.__fl_common.flowic_oif
 153#define flowi_iif       u.__fl_common.flowic_iif
 154#define flowi_mark      u.__fl_common.flowic_mark
 155#define flowi_tos       u.__fl_common.flowic_tos
 156#define flowi_scope     u.__fl_common.flowic_scope
 157#define flowi_proto     u.__fl_common.flowic_proto
 158#define flowi_flags     u.__fl_common.flowic_flags
 159#define flowi_secid     u.__fl_common.flowic_secid
 160} __attribute__((__aligned__(BITS_PER_LONG/8)));
 161
 162static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 163{
 164        return container_of(fl4, struct flowi, u.ip4);
 165}
 166
 167static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 168{
 169        return container_of(fl6, struct flowi, u.ip6);
 170}
 171
 172static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 173{
 174        return container_of(fldn, struct flowi, u.dn);
 175}
 176
 177typedef unsigned long flow_compare_t;
 178
 179static inline size_t flow_key_size(u16 family)
 180{
 181        switch (family) {
 182        case AF_INET:
 183                BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 184                return sizeof(struct flowi4) / sizeof(flow_compare_t);
 185        case AF_INET6:
 186                BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 187                return sizeof(struct flowi6) / sizeof(flow_compare_t);
 188        case AF_DECnet:
 189                BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 190                return sizeof(struct flowidn) / sizeof(flow_compare_t);
 191        }
 192        return 0;
 193}
 194
 195#define FLOW_DIR_IN     0
 196#define FLOW_DIR_OUT    1
 197#define FLOW_DIR_FWD    2
 198
 199struct net;
 200struct sock;
 201struct flow_cache_ops;
 202
 203struct flow_cache_object {
 204        const struct flow_cache_ops *ops;
 205};
 206
 207struct flow_cache_ops {
 208        struct flow_cache_object *(*get)(struct flow_cache_object *);
 209        int (*check)(struct flow_cache_object *);
 210        void (*delete)(struct flow_cache_object *);
 211};
 212
 213typedef struct flow_cache_object *(*flow_resolve_t)(
 214                struct net *net, const struct flowi *key, u16 family,
 215                u8 dir, struct flow_cache_object *oldobj, void *ctx);
 216
 217extern struct flow_cache_object *flow_cache_lookup(
 218                struct net *net, const struct flowi *key, u16 family,
 219                u8 dir, flow_resolve_t resolver, void *ctx);
 220
 221extern void flow_cache_flush(void);
 222extern void flow_cache_flush_deferred(void);
 223extern atomic_t flow_cache_genid;
 224
 225#endif
 226
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.