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 #include <linux/uidgid.h>
  14
  15 /*
  16  * ifindex generation is per-net namespace, and loopback is
  17  * always the 1st device in ns (see net_dev_init), thus any
  18  * loopback device should get ifindex 1
  19  */
  20
  21 #define LOOPBACK_IFINDEX        1
  22
  23 struct flowi_common {
  24         int     flowic_oif;
  25         int     flowic_iif;
  26         __u32   flowic_mark;
  27         __u8    flowic_tos;
  28         __u8    flowic_scope;
  29         __u8    flowic_proto;
  30         __u8    flowic_flags;
  31 #define FLOWI_FLAG_ANYSRC               0x01
  32 #define FLOWI_FLAG_CAN_SLEEP            0x02
  33 #define FLOWI_FLAG_KNOWN_NH             0x04
  34         __u32   flowic_secid;
  35         kuid_t  flowic_uid;
  36 };
  37
  38 union flowi_uli {
  39         struct {
  40                 __be16  dport;
  41                 __be16  sport;
  42         } ports;
  43
  44         struct {
  45                 __u8    type;
  46                 __u8    code;
  47         } icmpt;
  48
  49         struct {
  50                 __le16  dport;
  51                 __le16  sport;
  52         } dnports;
  53
  54         __be32          spi;
  55         __be32          gre_key;
  56
  57         struct {
  58                 __u8    type;
  59         } mht;
  60 };
  61
  62 struct flowi4 {
  63         struct flowi_common     __fl_common;
  64 #define flowi4_oif              __fl_common.flowic_oif
  65 #define flowi4_iif              __fl_common.flowic_iif
  66 #define flowi4_mark             __fl_common.flowic_mark
  67 #define flowi4_tos              __fl_common.flowic_tos
  68 #define flowi4_scope            __fl_common.flowic_scope
  69 #define flowi4_proto            __fl_common.flowic_proto
  70 #define flowi4_flags            __fl_common.flowic_flags
  71 #define flowi4_secid            __fl_common.flowic_secid
  72 #define flowi4_uid              __fl_common.flowic_uid
  73
  74         /* (saddr,daddr) must be grouped, same order as in IP header */
  75         __be32                  saddr;
  76         __be32                  daddr;
  77
  78         union flowi_uli         uli;
  79 #define fl4_sport               uli.ports.sport
  80 #define fl4_dport               uli.ports.dport
  81 #define fl4_icmp_type           uli.icmpt.type
  82 #define fl4_icmp_code           uli.icmpt.code
  83 #define fl4_ipsec_spi           uli.spi
  84 #define fl4_mh_type             uli.mht.type
  85 #define fl4_gre_key             uli.gre_key
  86 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  87
  88 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  89                                       __u32 mark, __u8 tos, __u8 scope,
  90                                       __u8 proto, __u8 flags,
  91                                       __be32 daddr, __be32 saddr,
  92                                       __be16 dport, __be16 sport,
  93                                       kuid_t uid)
  94 {
  95         fl4->flowi4_oif = oif;
  96         fl4->flowi4_iif = LOOPBACK_IFINDEX;
  97         fl4->flowi4_mark = mark;
  98         fl4->flowi4_tos = tos;
  99         fl4->flowi4_scope = scope;
 100         fl4->flowi4_proto = proto;
 101         fl4->flowi4_flags = flags;
 102         fl4->flowi4_secid = 0;
 103         fl4->flowi4_uid = uid;
 104         fl4->daddr = daddr;
 105         fl4->saddr = saddr;
 106         fl4->fl4_dport = dport;
 107         fl4->fl4_sport = sport;
 108 }
 109
 110 /* Reset some input parameters after previous lookup */
 111 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
 112                                         __be32 daddr, __be32 saddr)
 113 {
 114         fl4->flowi4_oif = oif;
 115         fl4->flowi4_tos = tos;
 116         fl4->daddr = daddr;
 117         fl4->saddr = saddr;
 118 }
 119
 120
 121 struct flowi6 {
 122         struct flowi_common     __fl_common;
 123 #define flowi6_oif              __fl_common.flowic_oif
 124 #define flowi6_iif              __fl_common.flowic_iif
 125 #define flowi6_mark             __fl_common.flowic_mark
 126 #define flowi6_tos              __fl_common.flowic_tos
 127 #define flowi6_scope            __fl_common.flowic_scope
 128 #define flowi6_proto            __fl_common.flowic_proto
 129 #define flowi6_flags            __fl_common.flowic_flags
 130 #define flowi6_secid            __fl_common.flowic_secid
 131 #define flowi6_uid              __fl_common.flowic_uid
 132         struct in6_addr         daddr;
 133         struct in6_addr         saddr;
 134         __be32                  flowlabel;
 135         union flowi_uli         uli;
 136 #define fl6_sport               uli.ports.sport
 137 #define fl6_dport               uli.ports.dport
 138 #define fl6_icmp_type           uli.icmpt.type
 139 #define fl6_icmp_code           uli.icmpt.code
 140 #define fl6_ipsec_spi           uli.spi
 141 #define fl6_mh_type             uli.mht.type
 142 #define fl6_gre_key             uli.gre_key
 143 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 144
 145 struct flowidn {
 146         struct flowi_common     __fl_common;
 147 #define flowidn_oif             __fl_common.flowic_oif
 148 #define flowidn_iif             __fl_common.flowic_iif
 149 #define flowidn_mark            __fl_common.flowic_mark
 150 #define flowidn_scope           __fl_common.flowic_scope
 151 #define flowidn_proto           __fl_common.flowic_proto
 152 #define flowidn_flags           __fl_common.flowic_flags
 153         __le16                  daddr;
 154         __le16                  saddr;
 155         union flowi_uli         uli;
 156 #define fld_sport               uli.ports.sport
 157 #define fld_dport               uli.ports.dport
 158 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 159
 160 struct flowi {
 161         union {
 162                 struct flowi_common     __fl_common;
 163                 struct flowi4           ip4;
 164                 struct flowi6           ip6;
 165                 struct flowidn          dn;
 166         } u;
 167 #define flowi_oif       u.__fl_common.flowic_oif
 168 #define flowi_iif       u.__fl_common.flowic_iif
 169 #define flowi_mark      u.__fl_common.flowic_mark
 170 #define flowi_tos       u.__fl_common.flowic_tos
 171 #define flowi_scope     u.__fl_common.flowic_scope
 172 #define flowi_proto     u.__fl_common.flowic_proto
 173 #define flowi_flags     u.__fl_common.flowic_flags
 174 #define flowi_secid     u.__fl_common.flowic_secid
 175 #define flowi_uid       u.__fl_common.flowic_uid
 176 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 177
 178 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 179 {
 180         return container_of(fl4, struct flowi, u.ip4);
 181 }
 182
 183 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 184 {
 185         return container_of(fl6, struct flowi, u.ip6);
 186 }
 187
 188 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 189 {
 190         return container_of(fldn, struct flowi, u.dn);
 191 }
 192
 193 typedef unsigned long flow_compare_t;
 194
 195 static inline size_t flow_key_size(u16 family)
 196 {
 197         switch (family) {
 198         case AF_INET:
 199                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 200                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
 201         case AF_INET6:
 202                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 203                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
 204         case AF_DECnet:
 205                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 206                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
 207         }
 208         return 0;
 209 }
 210
 211 #define FLOW_DIR_IN     0
 212 #define FLOW_DIR_OUT    1
 213 #define FLOW_DIR_FWD    2
 214
 215 struct net;
 216 struct sock;
 217 struct flow_cache_ops;
 218
 219 struct flow_cache_object {
 220         const struct flow_cache_ops *ops;
 221 };
 222
 223 struct flow_cache_ops {
 224         struct flow_cache_object *(*get)(struct flow_cache_object *);
 225         int (*check)(struct flow_cache_object *);
 226         void (*delete)(struct flow_cache_object *);
 227 };
 228
 229 typedef struct flow_cache_object *(*flow_resolve_t)(
 230                 struct net *net, const struct flowi *key, u16 family,
 231                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 232
 233 extern struct flow_cache_object *flow_cache_lookup(
 234                 struct net *net, const struct flowi *key, u16 family,
 235                 u8 dir, flow_resolve_t resolver, void *ctx);
 236
 237 extern void flow_cache_flush(void);
 238 extern void flow_cache_flush_deferred(void);
 239 extern atomic_t flow_cache_genid;
 240
 241 #endif