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