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