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 <net/flow_dissector.h>
  14 #include <linux/uidgid.h>
  15
  16 /*
  17  * ifindex generation is per-net namespace, and loopback is
  18  * always the 1st device in ns (see net_dev_init), thus any
  19  * loopback device should get ifindex 1
  20  */
  21
  22 #define LOOPBACK_IFINDEX        1
  23
  24 struct flowi_tunnel {
  25         __be64                  tun_id;
  26 };
  27
  28 struct flowi_common {
  29         int     flowic_oif;
  30         int     flowic_iif;
  31         __u32   flowic_mark;
  32         __u8    flowic_tos;
  33         __u8    flowic_scope;
  34         __u8    flowic_proto;
  35         __u8    flowic_flags;
  36 #define FLOWI_FLAG_ANYSRC               0x01
  37 #define FLOWI_FLAG_KNOWN_NH             0x02
  38 #define FLOWI_FLAG_SKIP_NH_OIF          0x04
  39         __u32   flowic_secid;
  40         struct flowi_tunnel flowic_tun_key;
  41         kuid_t  flowic_uid;
  42 };
  43
  44 union flowi_uli {
  45         struct {
  46                 __be16  dport;
  47                 __be16  sport;
  48         } ports;
  49
  50         struct {
  51                 __u8    type;
  52                 __u8    code;
  53         } icmpt;
  54
  55         struct {
  56                 __le16  dport;
  57                 __le16  sport;
  58         } dnports;
  59
  60         __be32          spi;
  61         __be32          gre_key;
  62
  63         struct {
  64                 __u8    type;
  65         } mht;
  66 };
  67
  68 struct flowi4 {
  69         struct flowi_common     __fl_common;
  70 #define flowi4_oif              __fl_common.flowic_oif
  71 #define flowi4_iif              __fl_common.flowic_iif
  72 #define flowi4_mark             __fl_common.flowic_mark
  73 #define flowi4_tos              __fl_common.flowic_tos
  74 #define flowi4_scope            __fl_common.flowic_scope
  75 #define flowi4_proto            __fl_common.flowic_proto
  76 #define flowi4_flags            __fl_common.flowic_flags
  77 #define flowi4_secid            __fl_common.flowic_secid
  78 #define flowi4_tun_key          __fl_common.flowic_tun_key
  79 #define flowi4_uid              __fl_common.flowic_uid
  80
  81         /* (saddr,daddr) must be grouped, same order as in IP header */
  82         __be32                  saddr;
  83         __be32                  daddr;
  84
  85         union flowi_uli         uli;
  86 #define fl4_sport               uli.ports.sport
  87 #define fl4_dport               uli.ports.dport
  88 #define fl4_icmp_type           uli.icmpt.type
  89 #define fl4_icmp_code           uli.icmpt.code
  90 #define fl4_ipsec_spi           uli.spi
  91 #define fl4_mh_type             uli.mht.type
  92 #define fl4_gre_key             uli.gre_key
  93 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  94
  95 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  96                                       __u32 mark, __u8 tos, __u8 scope,
  97                                       __u8 proto, __u8 flags,
  98                                       __be32 daddr, __be32 saddr,
  99                                       __be16 dport, __be16 sport,
 100                                       kuid_t uid)
 101 {
 102         fl4->flowi4_oif = oif;
 103         fl4->flowi4_iif = LOOPBACK_IFINDEX;
 104         fl4->flowi4_mark = mark;
 105         fl4->flowi4_tos = tos;
 106         fl4->flowi4_scope = scope;
 107         fl4->flowi4_proto = proto;
 108         fl4->flowi4_flags = flags;
 109         fl4->flowi4_secid = 0;
 110         fl4->flowi4_tun_key.tun_id = 0;
 111         fl4->flowi4_uid = uid;
 112         fl4->daddr = daddr;
 113         fl4->saddr = saddr;
 114         fl4->fl4_dport = dport;
 115         fl4->fl4_sport = sport;
 116 }
 117
 118 /* Reset some input parameters after previous lookup */
 119 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
 120                                         __be32 daddr, __be32 saddr)
 121 {
 122         fl4->flowi4_oif = oif;
 123         fl4->flowi4_tos = tos;
 124         fl4->daddr = daddr;
 125         fl4->saddr = saddr;
 126 }
 127
 128
 129 struct flowi6 {
 130         struct flowi_common     __fl_common;
 131 #define flowi6_oif              __fl_common.flowic_oif
 132 #define flowi6_iif              __fl_common.flowic_iif
 133 #define flowi6_mark             __fl_common.flowic_mark
 134 #define flowi6_scope            __fl_common.flowic_scope
 135 #define flowi6_proto            __fl_common.flowic_proto
 136 #define flowi6_flags            __fl_common.flowic_flags
 137 #define flowi6_secid            __fl_common.flowic_secid
 138 #define flowi6_tun_key          __fl_common.flowic_tun_key
 139 #define flowi6_uid              __fl_common.flowic_uid
 140         struct in6_addr         daddr;
 141         struct in6_addr         saddr;
 142         /* Note: flowi6_tos is encoded in flowlabel, too. */
 143         __be32                  flowlabel;
 144         union flowi_uli         uli;
 145 #define fl6_sport               uli.ports.sport
 146 #define fl6_dport               uli.ports.dport
 147 #define fl6_icmp_type           uli.icmpt.type
 148 #define fl6_icmp_code           uli.icmpt.code
 149 #define fl6_ipsec_spi           uli.spi
 150 #define fl6_mh_type             uli.mht.type
 151 #define fl6_gre_key             uli.gre_key
 152 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 153
 154 struct flowidn {
 155         struct flowi_common     __fl_common;
 156 #define flowidn_oif             __fl_common.flowic_oif
 157 #define flowidn_iif             __fl_common.flowic_iif
 158 #define flowidn_mark            __fl_common.flowic_mark
 159 #define flowidn_scope           __fl_common.flowic_scope
 160 #define flowidn_proto           __fl_common.flowic_proto
 161 #define flowidn_flags           __fl_common.flowic_flags
 162         __le16                  daddr;
 163         __le16                  saddr;
 164         union flowi_uli         uli;
 165 #define fld_sport               uli.ports.sport
 166 #define fld_dport               uli.ports.dport
 167 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 168
 169 struct flowi {
 170         union {
 171                 struct flowi_common     __fl_common;
 172                 struct flowi4           ip4;
 173                 struct flowi6           ip6;
 174                 struct flowidn          dn;
 175         } u;
 176 #define flowi_oif       u.__fl_common.flowic_oif
 177 #define flowi_iif       u.__fl_common.flowic_iif
 178 #define flowi_mark      u.__fl_common.flowic_mark
 179 #define flowi_tos       u.__fl_common.flowic_tos
 180 #define flowi_scope     u.__fl_common.flowic_scope
 181 #define flowi_proto     u.__fl_common.flowic_proto
 182 #define flowi_flags     u.__fl_common.flowic_flags
 183 #define flowi_secid     u.__fl_common.flowic_secid
 184 #define flowi_tun_key   u.__fl_common.flowic_tun_key
 185 #define flowi_uid       u.__fl_common.flowic_uid
 186 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 187
 188 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 189 {
 190         return container_of(fl4, struct flowi, u.ip4);
 191 }
 192
 193 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 194 {
 195         return container_of(fl6, struct flowi, u.ip6);
 196 }
 197
 198 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 199 {
 200         return container_of(fldn, struct flowi, u.dn);
 201 }
 202
 203 typedef unsigned long flow_compare_t;
 204
 205 static inline size_t flow_key_size(u16 family)
 206 {
 207         switch (family) {
 208         case AF_INET:
 209                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 210                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
 211         case AF_INET6:
 212                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 213                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
 214         case AF_DECnet:
 215                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 216                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
 217         }
 218         return 0;
 219 }
 220
 221 #define FLOW_DIR_IN     0
 222 #define FLOW_DIR_OUT    1
 223 #define FLOW_DIR_FWD    2
 224
 225 struct net;
 226 struct sock;
 227 struct flow_cache_ops;
 228
 229 struct flow_cache_object {
 230         const struct flow_cache_ops *ops;
 231 };
 232
 233 struct flow_cache_ops {
 234         struct flow_cache_object *(*get)(struct flow_cache_object *);
 235         int (*check)(struct flow_cache_object *);
 236         void (*delete)(struct flow_cache_object *);
 237 };
 238
 239 typedef struct flow_cache_object *(*flow_resolve_t)(
 240                 struct net *net, const struct flowi *key, u16 family,
 241                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 242
 243 struct flow_cache_object *flow_cache_lookup(struct net *net,
 244                                             const struct flowi *key, u16 family,
 245                                             u8 dir, flow_resolve_t resolver,
 246                                             void *ctx);
 247 int flow_cache_init(struct net *net);
 248 void flow_cache_fini(struct net *net);
 249 void flow_cache_hp_init(void);
 250
 251 void flow_cache_flush(struct net *net);
 252 void flow_cache_flush_deferred(struct net *net);
 253 extern atomic_t flow_cache_genid;
 254
 255 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
 256
 257 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
 258 {
 259         struct flow_keys keys;
 260
 261         return __get_hash_from_flowi6(fl6, &keys);
 262 }
 263
 264 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);
 265
 266 static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
 267 {
 268         struct flow_keys keys;
 269
 270         return __get_hash_from_flowi4(fl4, &keys);
 271 }
 272
 273 #endif