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