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/socket.h>
  11 #include <linux/in6.h>
  12 #include <linux/atomic.h>
  13
  14 struct 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_PRECOW_METRICS       0x02
  24 #define FLOWI_FLAG_CAN_SLEEP            0x04
  25         __u32   flowic_secid;
  26 };
  27
  28 union 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
  52 struct 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         __be32                  daddr;
  63         __be32                  saddr;
  64         union flowi_uli         uli;
  65 #define fl4_sport               uli.ports.sport
  66 #define fl4_dport               uli.ports.dport
  67 #define fl4_icmp_type           uli.icmpt.type
  68 #define fl4_icmp_code           uli.icmpt.code
  69 #define fl4_ipsec_spi           uli.spi
  70 #define fl4_mh_type             uli.mht.type
  71 #define fl4_gre_key             uli.gre_key
  72 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  73
  74 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  75                                       __u32 mark, __u8 tos, __u8 scope,
  76                                       __u8 proto, __u8 flags,
  77                                       __be32 daddr, __be32 saddr,
  78                                       __be16 dport, __be32 sport)
  79 {
  80         fl4->flowi4_oif = oif;
  81         fl4->flowi4_iif = 0;
  82         fl4->flowi4_mark = mark;
  83         fl4->flowi4_tos = tos;
  84         fl4->flowi4_scope = scope;
  85         fl4->flowi4_proto = proto;
  86         fl4->flowi4_flags = flags;
  87         fl4->flowi4_secid = 0;
  88         fl4->daddr = daddr;
  89         fl4->saddr = saddr;
  90         fl4->fl4_dport = dport;
  91         fl4->fl4_sport = sport;
  92 }
  93
  94
  95 struct flowi6 {
  96         struct flowi_common     __fl_common;
  97 #define flowi6_oif              __fl_common.flowic_oif
  98 #define flowi6_iif              __fl_common.flowic_iif
  99 #define flowi6_mark             __fl_common.flowic_mark
 100 #define flowi6_tos              __fl_common.flowic_tos
 101 #define flowi6_scope            __fl_common.flowic_scope
 102 #define flowi6_proto            __fl_common.flowic_proto
 103 #define flowi6_flags            __fl_common.flowic_flags
 104 #define flowi6_secid            __fl_common.flowic_secid
 105         struct in6_addr         daddr;
 106         struct in6_addr         saddr;
 107         __be32                  flowlabel;
 108         union flowi_uli         uli;
 109 #define fl6_sport               uli.ports.sport
 110 #define fl6_dport               uli.ports.dport
 111 #define fl6_icmp_type           uli.icmpt.type
 112 #define fl6_icmp_code           uli.icmpt.code
 113 #define fl6_ipsec_spi           uli.spi
 114 #define fl6_mh_type             uli.mht.type
 115 #define fl6_gre_key             uli.gre_key
 116 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 117
 118 struct flowidn {
 119         struct flowi_common     __fl_common;
 120 #define flowidn_oif             __fl_common.flowic_oif
 121 #define flowidn_iif             __fl_common.flowic_iif
 122 #define flowidn_mark            __fl_common.flowic_mark
 123 #define flowidn_scope           __fl_common.flowic_scope
 124 #define flowidn_proto           __fl_common.flowic_proto
 125 #define flowidn_flags           __fl_common.flowic_flags
 126         __le16                  daddr;
 127         __le16                  saddr;
 128         union flowi_uli         uli;
 129 #define fld_sport               uli.ports.sport
 130 #define fld_dport               uli.ports.dport
 131 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 132
 133 struct flowi {
 134         union {
 135                 struct flowi_common     __fl_common;
 136                 struct flowi4           ip4;
 137                 struct flowi6           ip6;
 138                 struct flowidn          dn;
 139         } u;
 140 #define flowi_oif       u.__fl_common.flowic_oif
 141 #define flowi_iif       u.__fl_common.flowic_iif
 142 #define flowi_mark      u.__fl_common.flowic_mark
 143 #define flowi_tos       u.__fl_common.flowic_tos
 144 #define flowi_scope     u.__fl_common.flowic_scope
 145 #define flowi_proto     u.__fl_common.flowic_proto
 146 #define flowi_flags     u.__fl_common.flowic_flags
 147 #define flowi_secid     u.__fl_common.flowic_secid
 148 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 149
 150 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 151 {
 152         return container_of(fl4, struct flowi, u.ip4);
 153 }
 154
 155 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 156 {
 157         return container_of(fl6, struct flowi, u.ip6);
 158 }
 159
 160 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 161 {
 162         return container_of(fldn, struct flowi, u.dn);
 163 }
 164
 165 typedef unsigned long flow_compare_t;
 166
 167 static inline size_t flow_key_size(u16 family)
 168 {
 169         switch (family) {
 170         case AF_INET:
 171                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 172                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
 173         case AF_INET6:
 174                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 175                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
 176         case AF_DECnet:
 177                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 178                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
 179         }
 180         return 0;
 181 }
 182
 183 #define FLOW_DIR_IN     0
 184 #define FLOW_DIR_OUT    1
 185 #define FLOW_DIR_FWD    2
 186
 187 struct net;
 188 struct sock;
 189 struct flow_cache_ops;
 190
 191 struct flow_cache_object {
 192         const struct flow_cache_ops *ops;
 193 };
 194
 195 struct flow_cache_ops {
 196         struct flow_cache_object *(*get)(struct flow_cache_object *);
 197         int (*check)(struct flow_cache_object *);
 198         void (*delete)(struct flow_cache_object *);
 199 };
 200
 201 typedef struct flow_cache_object *(*flow_resolve_t)(
 202                 struct net *net, const struct flowi *key, u16 family,
 203                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 204
 205 extern struct flow_cache_object *flow_cache_lookup(
 206                 struct net *net, const struct flowi *key, u16 family,
 207                 u8 dir, flow_resolve_t resolver, void *ctx);
 208
 209 extern void flow_cache_flush(void);
 210 extern atomic_t flow_cache_genid;
 211
 212 #endif