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_L3MDEV_SRC           0x04
  38 #define FLOWI_FLAG_SKIP_NH_OIF          0x08
  39         __u32   flowic_secid;
  40         struct flowi_tunnel flowic_tun_key;
  41 };
  42
  43 union flowi_uli {
  44         struct {
  45                 __be16  dport;
  46                 __be16  sport;
  47         } ports;
  48
  49         struct {
  50                 __u8    type;
  51                 __u8    code;
  52         } icmpt;
  53
  54         struct {
  55                 __le16  dport;
  56                 __le16  sport;
  57         } dnports;
  58
  59         __be32          spi;
  60         __be32          gre_key;
  61
  62         struct {
  63                 __u8    type;
  64         } mht;
  65 };
  66
  67 struct flowi4 {
  68         struct flowi_common     __fl_common;
  69 #define flowi4_oif              __fl_common.flowic_oif
  70 #define flowi4_iif              __fl_common.flowic_iif
  71 #define flowi4_mark             __fl_common.flowic_mark
  72 #define flowi4_tos              __fl_common.flowic_tos
  73 #define flowi4_scope            __fl_common.flowic_scope
  74 #define flowi4_proto            __fl_common.flowic_proto
  75 #define flowi4_flags            __fl_common.flowic_flags
  76 #define flowi4_secid            __fl_common.flowic_secid
  77 #define flowi4_tun_key          __fl_common.flowic_tun_key
  78
  79         /* (saddr,daddr) must be grouped, same order as in IP header */
  80         __be32                  saddr;
  81         __be32                  daddr;
  82
  83         union flowi_uli         uli;
  84 #define fl4_sport               uli.ports.sport
  85 #define fl4_dport               uli.ports.dport
  86 #define fl4_icmp_type           uli.icmpt.type
  87 #define fl4_icmp_code           uli.icmpt.code
  88 #define fl4_ipsec_spi           uli.spi
  89 #define fl4_mh_type             uli.mht.type
  90 #define fl4_gre_key             uli.gre_key
  91 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  92
  93 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  94                                       __u32 mark, __u8 tos, __u8 scope,
  95                                       __u8 proto, __u8 flags,
  96                                       __be32 daddr, __be32 saddr,
  97                                       __be16 dport, __be16 sport)
  98 {
  99         fl4->flowi4_oif = oif;
 100         fl4->flowi4_iif = LOOPBACK_IFINDEX;
 101         fl4->flowi4_mark = mark;
 102         fl4->flowi4_tos = tos;
 103         fl4->flowi4_scope = scope;
 104         fl4->flowi4_proto = proto;
 105         fl4->flowi4_flags = flags;
 106         fl4->flowi4_secid = 0;
 107         fl4->flowi4_tun_key.tun_id = 0;
 108         fl4->daddr = daddr;
 109         fl4->saddr = saddr;
 110         fl4->fl4_dport = dport;
 111         fl4->fl4_sport = sport;
 112 }
 113
 114 /* Reset some input parameters after previous lookup */
 115 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
 116                                         __be32 daddr, __be32 saddr)
 117 {
 118         fl4->flowi4_oif = oif;
 119         fl4->flowi4_tos = tos;
 120         fl4->daddr = daddr;
 121         fl4->saddr = saddr;
 122 }
 123
 124
 125 struct flowi6 {
 126         struct flowi_common     __fl_common;
 127 #define flowi6_oif              __fl_common.flowic_oif
 128 #define flowi6_iif              __fl_common.flowic_iif
 129 #define flowi6_mark             __fl_common.flowic_mark
 130 #define flowi6_scope            __fl_common.flowic_scope
 131 #define flowi6_proto            __fl_common.flowic_proto
 132 #define flowi6_flags            __fl_common.flowic_flags
 133 #define flowi6_secid            __fl_common.flowic_secid
 134 #define flowi6_tun_key          __fl_common.flowic_tun_key
 135         struct in6_addr         daddr;
 136         struct in6_addr         saddr;
 137         /* Note: flowi6_tos is encoded in flowlabel, too. */
 138         __be32                  flowlabel;
 139         union flowi_uli         uli;
 140 #define fl6_sport               uli.ports.sport
 141 #define fl6_dport               uli.ports.dport
 142 #define fl6_icmp_type           uli.icmpt.type
 143 #define fl6_icmp_code           uli.icmpt.code
 144 #define fl6_ipsec_spi           uli.spi
 145 #define fl6_mh_type             uli.mht.type
 146 #define fl6_gre_key             uli.gre_key
 147 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 148
 149 struct flowidn {
 150         struct flowi_common     __fl_common;
 151 #define flowidn_oif             __fl_common.flowic_oif
 152 #define flowidn_iif             __fl_common.flowic_iif
 153 #define flowidn_mark            __fl_common.flowic_mark
 154 #define flowidn_scope           __fl_common.flowic_scope
 155 #define flowidn_proto           __fl_common.flowic_proto
 156 #define flowidn_flags           __fl_common.flowic_flags
 157         __le16                  daddr;
 158         __le16                  saddr;
 159         union flowi_uli         uli;
 160 #define fld_sport               uli.ports.sport
 161 #define fld_dport               uli.ports.dport
 162 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 163
 164 struct flowi {
 165         union {
 166                 struct flowi_common     __fl_common;
 167                 struct flowi4           ip4;
 168                 struct flowi6           ip6;
 169                 struct flowidn          dn;
 170         } u;
 171 #define flowi_oif       u.__fl_common.flowic_oif
 172 #define flowi_iif       u.__fl_common.flowic_iif
 173 #define flowi_mark      u.__fl_common.flowic_mark
 174 #define flowi_tos       u.__fl_common.flowic_tos
 175 #define flowi_scope     u.__fl_common.flowic_scope
 176 #define flowi_proto     u.__fl_common.flowic_proto
 177 #define flowi_flags     u.__fl_common.flowic_flags
 178 #define flowi_secid     u.__fl_common.flowic_secid
 179 #define flowi_tun_key   u.__fl_common.flowic_tun_key
 180 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 181
 182 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 183 {
 184         return container_of(fl4, struct flowi, u.ip4);
 185 }
 186
 187 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 188 {
 189         return container_of(fl6, struct flowi, u.ip6);
 190 }
 191
 192 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 193 {
 194         return container_of(fldn, struct flowi, u.dn);
 195 }
 196
 197 typedef unsigned long flow_compare_t;
 198
 199 static inline size_t flow_key_size(u16 family)
 200 {
 201         switch (family) {
 202         case AF_INET:
 203                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
 204                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
 205         case AF_INET6:
 206                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
 207                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
 208         case AF_DECnet:
 209                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
 210                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
 211         }
 212         return 0;
 213 }
 214
 215 #define FLOW_DIR_IN     0
 216 #define FLOW_DIR_OUT    1
 217 #define FLOW_DIR_FWD    2
 218
 219 struct net;
 220 struct sock;
 221 struct flow_cache_ops;
 222
 223 struct flow_cache_object {
 224         const struct flow_cache_ops *ops;
 225 };
 226
 227 struct flow_cache_ops {
 228         struct flow_cache_object *(*get)(struct flow_cache_object *);
 229         int (*check)(struct flow_cache_object *);
 230         void (*delete)(struct flow_cache_object *);
 231 };
 232
 233 typedef struct flow_cache_object *(*flow_resolve_t)(
 234                 struct net *net, const struct flowi *key, u16 family,
 235                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 236
 237 struct flow_cache_object *flow_cache_lookup(struct net *net,
 238                                             const struct flowi *key, u16 family,
 239                                             u8 dir, flow_resolve_t resolver,
 240                                             void *ctx);
 241 int flow_cache_init(struct net *net);
 242 void flow_cache_fini(struct net *net);
 243
 244 void flow_cache_flush(struct net *net);
 245 void flow_cache_flush_deferred(struct net *net);
 246 extern atomic_t flow_cache_genid;
 247
 248 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
 249
 250 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
 251 {
 252         struct flow_keys keys;
 253
 254         return __get_hash_from_flowi6(fl6, &keys);
 255 }
 256
 257 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);
 258
 259 static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
 260 {
 261         struct flow_keys keys;
 262
 263         return __get_hash_from_flowi4(fl4, &keys);
 264 }
 265
 266 #endif