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 #define FLOWI_FLAG_RT_NOCACHE           0x08
  26         __u32   flowic_secid;
  27 };
  28
  29 union flowi_uli {
  30         struct {
  31                 __be16  dport;
  32                 __be16  sport;
  33         } ports;
  34
  35         struct {
  36                 __u8    type;
  37                 __u8    code;
  38         } icmpt;
  39
  40         struct {
  41                 __le16  dport;
  42                 __le16  sport;
  43         } dnports;
  44
  45         __be32          spi;
  46         __be32          gre_key;
  47
  48         struct {
  49                 __u8    type;
  50         } mht;
  51 };
  52
  53 struct flowi4 {
  54         struct flowi_common     __fl_common;
  55 #define flowi4_oif              __fl_common.flowic_oif
  56 #define flowi4_iif              __fl_common.flowic_iif
  57 #define flowi4_mark             __fl_common.flowic_mark
  58 #define flowi4_tos              __fl_common.flowic_tos
  59 #define flowi4_scope            __fl_common.flowic_scope
  60 #define flowi4_proto            __fl_common.flowic_proto
  61 #define flowi4_flags            __fl_common.flowic_flags
  62 #define flowi4_secid            __fl_common.flowic_secid
  63
  64         /* (saddr,daddr) must be grouped, same order as in IP header */
  65         __be32                  saddr;
  66         __be32                  daddr;
  67
  68         union flowi_uli         uli;
  69 #define fl4_sport               uli.ports.sport
  70 #define fl4_dport               uli.ports.dport
  71 #define fl4_icmp_type           uli.icmpt.type
  72 #define fl4_icmp_code           uli.icmpt.code
  73 #define fl4_ipsec_spi           uli.spi
  74 #define fl4_mh_type             uli.mht.type
  75 #define fl4_gre_key             uli.gre_key
  76 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  77
  78 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  79                                       __u32 mark, __u8 tos, __u8 scope,
  80                                       __u8 proto, __u8 flags,
  81                                       __be32 daddr, __be32 saddr,
  82                                       __be16 dport, __be16 sport)
  83 {
  84         fl4->flowi4_oif = oif;
  85         fl4->flowi4_iif = 0;
  86         fl4->flowi4_mark = mark;
  87         fl4->flowi4_tos = tos;
  88         fl4->flowi4_scope = scope;
  89         fl4->flowi4_proto = proto;
  90         fl4->flowi4_flags = flags;
  91         fl4->flowi4_secid = 0;
  92         fl4->daddr = daddr;
  93         fl4->saddr = saddr;
  94         fl4->fl4_dport = dport;
  95         fl4->fl4_sport = sport;
  96 }
  97
  98 /* Reset some input parameters after previous lookup */
  99 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
 100                                         __be32 daddr, __be32 saddr)
 101 {
 102         fl4->flowi4_oif = oif;
 103         fl4->flowi4_tos = tos;
 104         fl4->daddr = daddr;
 105         fl4->saddr = saddr;
 106 }
 107
 108
 109 struct flowi6 {
 110         struct flowi_common     __fl_common;
 111 #define flowi6_oif              __fl_common.flowic_oif
 112 #define flowi6_iif              __fl_common.flowic_iif
 113 #define flowi6_mark             __fl_common.flowic_mark
 114 #define flowi6_tos              __fl_common.flowic_tos
 115 #define flowi6_scope            __fl_common.flowic_scope
 116 #define flowi6_proto            __fl_common.flowic_proto
 117 #define flowi6_flags            __fl_common.flowic_flags
 118 #define flowi6_secid            __fl_common.flowic_secid
 119         struct in6_addr         daddr;
 120         struct in6_addr         saddr;
 121         __be32                  flowlabel;
 122         union flowi_uli         uli;
 123 #define fl6_sport               uli.ports.sport
 124 #define fl6_dport               uli.ports.dport
 125 #define fl6_icmp_type           uli.icmpt.type
 126 #define fl6_icmp_code           uli.icmpt.code
 127 #define fl6_ipsec_spi           uli.spi
 128 #define fl6_mh_type             uli.mht.type
 129 #define fl6_gre_key             uli.gre_key
 130 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 131
 132 struct flowidn {
 133         struct flowi_common     __fl_common;
 134 #define flowidn_oif             __fl_common.flowic_oif
 135 #define flowidn_iif             __fl_common.flowic_iif
 136 #define flowidn_mark            __fl_common.flowic_mark
 137 #define flowidn_scope           __fl_common.flowic_scope
 138 #define flowidn_proto           __fl_common.flowic_proto
 139 #define flowidn_flags           __fl_common.flowic_flags
 140         __le16                  daddr;
 141         __le16                  saddr;
 142         union flowi_uli         uli;
 143 #define fld_sport               uli.ports.sport
 144 #define fld_dport               uli.ports.dport
 145 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 146
 147 struct flowi {
 148         union {
 149                 struct flowi_common     __fl_common;
 150                 struct flowi4           ip4;
 151                 struct flowi6           ip6;
 152                 struct flowidn          dn;
 153         } u;
 154 #define flowi_oif       u.__fl_common.flowic_oif
 155 #define flowi_iif       u.__fl_common.flowic_iif
 156 #define flowi_mark      u.__fl_common.flowic_mark
 157 #define flowi_tos       u.__fl_common.flowic_tos
 158 #define flowi_scope     u.__fl_common.flowic_scope
 159 #define flowi_proto     u.__fl_common.flowic_proto
 160 #define flowi_flags     u.__fl_common.flowic_flags
 161 #define flowi_secid     u.__fl_common.flowic_secid
 162 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 163
 164 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 165 {
 166         return container_of(fl4, struct flowi, u.ip4);
 167 }
 168
 169 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 170 {
 171         return container_of(fl6, struct flowi, u.ip6);
 172 }
 173
 174 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 175 {
 176         return container_of(fldn, struct flowi, u.dn);
 177 }
 178
 179 typedef unsigned long flow_compare_t;
 180
 181 static inline size_t flow_key_size(u16 family)
 182 {
 183         switch (family) {
 184         case AF_INET:
 185                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 186                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
 187         case AF_INET6:
 188                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 189                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
 190         case AF_DECnet:
 191                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 192                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
 193         }
 194         return 0;
 195 }
 196
 197 #define FLOW_DIR_IN     0
 198 #define FLOW_DIR_OUT    1
 199 #define FLOW_DIR_FWD    2
 200
 201 struct net;
 202 struct sock;
 203 struct flow_cache_ops;
 204
 205 struct flow_cache_object {
 206         const struct flow_cache_ops *ops;
 207 };
 208
 209 struct flow_cache_ops {
 210         struct flow_cache_object *(*get)(struct flow_cache_object *);
 211         int (*check)(struct flow_cache_object *);
 212         void (*delete)(struct flow_cache_object *);
 213 };
 214
 215 typedef struct flow_cache_object *(*flow_resolve_t)(
 216                 struct net *net, const struct flowi *key, u16 family,
 217                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 218
 219 extern struct flow_cache_object *flow_cache_lookup(
 220                 struct net *net, const struct flowi *key, u16 family,
 221                 u8 dir, flow_resolve_t resolver, void *ctx);
 222
 223 extern void flow_cache_flush(void);
 224 extern void flow_cache_flush_deferred(void);
 225 extern atomic_t flow_cache_genid;
 226
 227 #endif