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
  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
  98 struct flowi6 {
  99         struct flowi_common     __fl_common;
 100 #define flowi6_oif              __fl_common.flowic_oif
 101 #define flowi6_iif              __fl_common.flowic_iif
 102 #define flowi6_mark             __fl_common.flowic_mark
 103 #define flowi6_tos              __fl_common.flowic_tos
 104 #define flowi6_scope            __fl_common.flowic_scope
 105 #define flowi6_proto            __fl_common.flowic_proto
 106 #define flowi6_flags            __fl_common.flowic_flags
 107 #define flowi6_secid            __fl_common.flowic_secid
 108         struct in6_addr         daddr;
 109         struct in6_addr         saddr;
 110         __be32                  flowlabel;
 111         union flowi_uli         uli;
 112 #define fl6_sport               uli.ports.sport
 113 #define fl6_dport               uli.ports.dport
 114 #define fl6_icmp_type           uli.icmpt.type
 115 #define fl6_icmp_code           uli.icmpt.code
 116 #define fl6_ipsec_spi           uli.spi
 117 #define fl6_mh_type             uli.mht.type
 118 #define fl6_gre_key             uli.gre_key
 119 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 120
 121 struct flowidn {
 122         struct flowi_common     __fl_common;
 123 #define flowidn_oif             __fl_common.flowic_oif
 124 #define flowidn_iif             __fl_common.flowic_iif
 125 #define flowidn_mark            __fl_common.flowic_mark
 126 #define flowidn_scope           __fl_common.flowic_scope
 127 #define flowidn_proto           __fl_common.flowic_proto
 128 #define flowidn_flags           __fl_common.flowic_flags
 129         __le16                  daddr;
 130         __le16                  saddr;
 131         union flowi_uli         uli;
 132 #define fld_sport               uli.ports.sport
 133 #define fld_dport               uli.ports.dport
 134 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 135
 136 struct flowi {
 137         union {
 138                 struct flowi_common     __fl_common;
 139                 struct flowi4           ip4;
 140                 struct flowi6           ip6;
 141                 struct flowidn          dn;
 142         } u;
 143 #define flowi_oif       u.__fl_common.flowic_oif
 144 #define flowi_iif       u.__fl_common.flowic_iif
 145 #define flowi_mark      u.__fl_common.flowic_mark
 146 #define flowi_tos       u.__fl_common.flowic_tos
 147 #define flowi_scope     u.__fl_common.flowic_scope
 148 #define flowi_proto     u.__fl_common.flowic_proto
 149 #define flowi_flags     u.__fl_common.flowic_flags
 150 #define flowi_secid     u.__fl_common.flowic_secid
 151 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 152
 153 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 154 {
 155         return container_of(fl4, struct flowi, u.ip4);
 156 }
 157
 158 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 159 {
 160         return container_of(fl6, struct flowi, u.ip6);
 161 }
 162
 163 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 164 {
 165         return container_of(fldn, struct flowi, u.dn);
 166 }
 167
 168 typedef unsigned long flow_compare_t;
 169
 170 static inline size_t flow_key_size(u16 family)
 171 {
 172         switch (family) {
 173         case AF_INET:
 174                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 175                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
 176         case AF_INET6:
 177                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 178                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
 179         case AF_DECnet:
 180                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 181                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
 182         }
 183         return 0;
 184 }
 185
 186 #define FLOW_DIR_IN     0
 187 #define FLOW_DIR_OUT    1
 188 #define FLOW_DIR_FWD    2
 189
 190 struct net;
 191 struct sock;
 192 struct flow_cache_ops;
 193
 194 struct flow_cache_object {
 195         const struct flow_cache_ops *ops;
 196 };
 197
 198 struct flow_cache_ops {
 199         struct flow_cache_object *(*get)(struct flow_cache_object *);
 200         int (*check)(struct flow_cache_object *);
 201         void (*delete)(struct flow_cache_object *);
 202 };
 203
 204 typedef struct flow_cache_object *(*flow_resolve_t)(
 205                 struct net *net, const struct flowi *key, u16 family,
 206                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 207
 208 extern struct flow_cache_object *flow_cache_lookup(
 209                 struct net *net, const struct flowi *key, u16 family,
 210                 u8 dir, flow_resolve_t resolver, void *ctx);
 211
 212 extern void flow_cache_flush(void);
 213 extern void flow_cache_flush_deferred(void);
 214 extern atomic_t flow_cache_genid;
 215
 216 #endif