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_CAN_SLEEP            0x02
  24 #define FLOWI_FLAG_KNOWN_NH             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
  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
  77 static 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 */
  98 static 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
 108 struct 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
 131 struct 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
 146 struct 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
 163 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 164 {
 165         return container_of(fl4, struct flowi, u.ip4);
 166 }
 167
 168 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 169 {
 170         return container_of(fl6, struct flowi, u.ip6);
 171 }
 172
 173 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 174 {
 175         return container_of(fldn, struct flowi, u.dn);
 176 }
 177
 178 typedef unsigned long flow_compare_t;
 179
 180 static 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
 200 struct net;
 201 struct sock;
 202 struct flow_cache_ops;
 203
 204 struct flow_cache_object {
 205         const struct flow_cache_ops *ops;
 206 };
 207
 208 struct 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
 214 typedef 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
 218 extern 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
 222 extern void flow_cache_flush(void);
 223 extern void flow_cache_flush_deferred(void);
 224 extern atomic_t flow_cache_genid;
 225
 226 #endif