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_KNOWN_NH             0x02
  24         __u32   flowic_secid;
  25 };
  26
  27 union 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
  51 struct 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
  76 static 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 */
  97 static 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
 107 struct 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
 130 struct 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
 145 struct 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
 162 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 163 {
 164         return container_of(fl4, struct flowi, u.ip4);
 165 }
 166
 167 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 168 {
 169         return container_of(fl6, struct flowi, u.ip6);
 170 }
 171
 172 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 173 {
 174         return container_of(fldn, struct flowi, u.dn);
 175 }
 176
 177 typedef unsigned long flow_compare_t;
 178
 179 static 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
 199 struct net;
 200 struct sock;
 201 struct flow_cache_ops;
 202
 203 struct flow_cache_object {
 204         const struct flow_cache_ops *ops;
 205 };
 206
 207 struct 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
 213 typedef 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
 217 struct flow_cache_object *flow_cache_lookup(struct net *net,
 218                                             const struct flowi *key, u16 family,
 219                                             u8 dir, flow_resolve_t resolver,
 220                                             void *ctx);
 221
 222 void flow_cache_flush(void);
 223 void flow_cache_flush_deferred(void);
 224 extern atomic_t flow_cache_genid;
 225
 226 #endif