linux/include/net/flow.h
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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/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#define FLOWI_FLAG_KNOWN_NH             0x04
  25        __u32   flowic_secid;
  26};
  27
  28union flowi_uli {
  29        struct {
  30                __be16  dport;
  31                __be16  sport;
  32        } ports;
  33
  34        struct {
  35                __u8    type;
  36                __u8    code;
  37        } icmpt;
  38
  39        struct {
  40                __le16  dport;
  41                __le16  sport;
  42        } dnports;
  43
  44        __be32          spi;
  45        __be32          gre_key;
  46
  47        struct {
  48                __u8    type;
  49        } mht;
  50};
  51
  52struct flowi4 {
  53        struct flowi_common     __fl_common;
  54#define flowi4_oif              __fl_common.flowic_oif
  55#define flowi4_iif              __fl_common.flowic_iif
  56#define flowi4_mark             __fl_common.flowic_mark
  57#define flowi4_tos              __fl_common.flowic_tos
  58#define flowi4_scope            __fl_common.flowic_scope
  59#define flowi4_proto            __fl_common.flowic_proto
  60#define flowi4_flags            __fl_common.flowic_flags
  61#define flowi4_secid            __fl_common.flowic_secid
  62
  63        /* (saddr,daddr) must be grouped, same order as in IP header */
  64        __be32                  saddr;
  65        __be32                  daddr;
  66
  67        union flowi_uli         uli;
  68#define fl4_sport               uli.ports.sport
  69#define fl4_dport               uli.ports.dport
  70#define fl4_icmp_type           uli.icmpt.type
  71#define fl4_icmp_code           uli.icmpt.code
  72#define fl4_ipsec_spi           uli.spi
  73#define fl4_mh_type             uli.mht.type
  74#define fl4_gre_key             uli.gre_key
  75} __attribute__((__aligned__(BITS_PER_LONG/8)));
  76
  77static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  78                                      __u32 mark, __u8 tos, __u8 scope,
  79                                      __u8 proto, __u8 flags,
  80                                      __be32 daddr, __be32 saddr,
  81                                      __be16 dport, __be16 sport)
  82{
  83        fl4->flowi4_oif = oif;
  84        fl4->flowi4_iif = 0;
  85        fl4->flowi4_mark = mark;
  86        fl4->flowi4_tos = tos;
  87        fl4->flowi4_scope = scope;
  88        fl4->flowi4_proto = proto;
  89        fl4->flowi4_flags = flags;
  90        fl4->flowi4_secid = 0;
  91        fl4->daddr = daddr;
  92        fl4->saddr = saddr;
  93        fl4->fl4_dport = dport;
  94        fl4->fl4_sport = sport;
  95}
  96
  97/* Reset some input parameters after previous lookup */
  98static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
  99                                        __be32 daddr, __be32 saddr)
 100{
 101        fl4->flowi4_oif = oif;
 102        fl4->flowi4_tos = tos;
 103        fl4->daddr = daddr;
 104        fl4->saddr = saddr;
 105}
 106                                      
 107
 108struct flowi6 {
 109        struct flowi_common     __fl_common;
 110#define flowi6_oif              __fl_common.flowic_oif
 111#define flowi6_iif              __fl_common.flowic_iif
 112#define flowi6_mark             __fl_common.flowic_mark
 113#define flowi6_tos              __fl_common.flowic_tos
 114#define flowi6_scope            __fl_common.flowic_scope
 115#define flowi6_proto            __fl_common.flowic_proto
 116#define flowi6_flags            __fl_common.flowic_flags
 117#define flowi6_secid            __fl_common.flowic_secid
 118        struct in6_addr         daddr;
 119        struct in6_addr         saddr;
 120        __be32                  flowlabel;
 121        union flowi_uli         uli;
 122#define fl6_sport               uli.ports.sport
 123#define fl6_dport               uli.ports.dport
 124#define fl6_icmp_type           uli.icmpt.type
 125#define fl6_icmp_code           uli.icmpt.code
 126#define fl6_ipsec_spi           uli.spi
 127#define fl6_mh_type             uli.mht.type
 128#define fl6_gre_key             uli.gre_key
 129} __attribute__((__aligned__(BITS_PER_LONG/8)));
 130
 131struct flowidn {
 132        struct flowi_common     __fl_common;
 133#define flowidn_oif             __fl_common.flowic_oif
 134#define flowidn_iif             __fl_common.flowic_iif
 135#define flowidn_mark            __fl_common.flowic_mark
 136#define flowidn_scope           __fl_common.flowic_scope
 137#define flowidn_proto           __fl_common.flowic_proto
 138#define flowidn_flags           __fl_common.flowic_flags
 139        __le16                  daddr;
 140        __le16                  saddr;
 141        union flowi_uli         uli;
 142#define fld_sport               uli.ports.sport
 143#define fld_dport               uli.ports.dport
 144} __attribute__((__aligned__(BITS_PER_LONG/8)));
 145
 146struct flowi {
 147        union {
 148                struct flowi_common     __fl_common;
 149                struct flowi4           ip4;
 150                struct flowi6           ip6;
 151                struct flowidn          dn;
 152        } u;
 153#define flowi_oif       u.__fl_common.flowic_oif
 154#define flowi_iif       u.__fl_common.flowic_iif
 155#define flowi_mark      u.__fl_common.flowic_mark
 156#define flowi_tos       u.__fl_common.flowic_tos
 157#define flowi_scope     u.__fl_common.flowic_scope
 158#define flowi_proto     u.__fl_common.flowic_proto
 159#define flowi_flags     u.__fl_common.flowic_flags
 160#define flowi_secid     u.__fl_common.flowic_secid
 161} __attribute__((__aligned__(BITS_PER_LONG/8)));
 162
 163static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 164{
 165        return container_of(fl4, struct flowi, u.ip4);
 166}
 167
 168static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 169{
 170        return container_of(fl6, struct flowi, u.ip6);
 171}
 172
 173static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 174{
 175        return container_of(fldn, struct flowi, u.dn);
 176}
 177
 178typedef unsigned long flow_compare_t;
 179
 180static inline size_t flow_key_size(u16 family)
 181{
 182        switch (family) {
 183        case AF_INET:
 184                BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 185                return sizeof(struct flowi4) / sizeof(flow_compare_t);
 186        case AF_INET6:
 187                BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 188                return sizeof(struct flowi6) / sizeof(flow_compare_t);
 189        case AF_DECnet:
 190                BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 191                return sizeof(struct flowidn) / sizeof(flow_compare_t);
 192        }
 193        return 0;
 194}
 195
 196#define FLOW_DIR_IN     0
 197#define FLOW_DIR_OUT    1
 198#define FLOW_DIR_FWD    2
 199
 200struct net;
 201struct sock;
 202struct flow_cache_ops;
 203
 204struct flow_cache_object {
 205        const struct flow_cache_ops *ops;
 206};
 207
 208struct flow_cache_ops {
 209        struct flow_cache_object *(*get)(struct flow_cache_object *);
 210        int (*check)(struct flow_cache_object *);
 211        void (*delete)(struct flow_cache_object *);
 212};
 213
 214typedef struct flow_cache_object *(*flow_resolve_t)(
 215                struct net *net, const struct flowi *key, u16 family,
 216                u8 dir, struct flow_cache_object *oldobj, void *ctx);
 217
 218extern struct flow_cache_object *flow_cache_lookup(
 219                struct net *net, const struct flowi *key, u16 family,
 220                u8 dir, flow_resolve_t resolver, void *ctx);
 221
 222extern void flow_cache_flush(void);
 223extern void flow_cache_flush_deferred(void);
 224extern atomic_t flow_cache_genid;
 225
 226#endif
 227
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