kernel/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_common {
  23         int     flowic_oif;
  24         int     flowic_iif;
  25         __u32   flowic_mark;
  26         __u8    flowic_tos;
  27         __u8    flowic_scope;
  28         __u8    flowic_proto;
  29         __u8    flowic_flags;
  30 #define FLOWI_FLAG_ANYSRC               0x01
  31 #define FLOWI_FLAG_KNOWN_NH             0x02
  32         __u32   flowic_secid;
  33 };
  34
  35 union flowi_uli {
  36         struct {
  37                 __be16  dport;
  38                 __be16  sport;
  39         } ports;
  40
  41         struct {
  42                 __u8    type;
  43                 __u8    code;
  44         } icmpt;
  45
  46         struct {
  47                 __le16  dport;
  48                 __le16  sport;
  49         } dnports;
  50
  51         __be32          spi;
  52         __be32          gre_key;
  53
  54         struct {
  55                 __u8    type;
  56         } mht;
  57 };
  58
  59 struct flowi4 {
  60         struct flowi_common     __fl_common;
  61 #define flowi4_oif              __fl_common.flowic_oif
  62 #define flowi4_iif              __fl_common.flowic_iif
  63 #define flowi4_mark             __fl_common.flowic_mark
  64 #define flowi4_tos              __fl_common.flowic_tos
  65 #define flowi4_scope            __fl_common.flowic_scope
  66 #define flowi4_proto            __fl_common.flowic_proto
  67 #define flowi4_flags            __fl_common.flowic_flags
  68 #define flowi4_secid            __fl_common.flowic_secid
  69
  70         /* (saddr,daddr) must be grouped, same order as in IP header */
  71         __be32                  saddr;
  72         __be32                  daddr;
  73
  74         union flowi_uli         uli;
  75 #define fl4_sport               uli.ports.sport
  76 #define fl4_dport               uli.ports.dport
  77 #define fl4_icmp_type           uli.icmpt.type
  78 #define fl4_icmp_code           uli.icmpt.code
  79 #define fl4_ipsec_spi           uli.spi
  80 #define fl4_mh_type             uli.mht.type
  81 #define fl4_gre_key             uli.gre_key
  82 } __attribute__((__aligned__(BITS_PER_LONG/8)));
  83
  84 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
  85                                       __u32 mark, __u8 tos, __u8 scope,
  86                                       __u8 proto, __u8 flags,
  87                                       __be32 daddr, __be32 saddr,
  88                                       __be16 dport, __be16 sport)
  89 {
  90         fl4->flowi4_oif = oif;
  91         fl4->flowi4_iif = LOOPBACK_IFINDEX;
  92         fl4->flowi4_mark = mark;
  93         fl4->flowi4_tos = tos;
  94         fl4->flowi4_scope = scope;
  95         fl4->flowi4_proto = proto;
  96         fl4->flowi4_flags = flags;
  97         fl4->flowi4_secid = 0;
  98         fl4->daddr = daddr;
  99         fl4->saddr = saddr;
 100         fl4->fl4_dport = dport;
 101         fl4->fl4_sport = sport;
 102 }
 103
 104 /* Reset some input parameters after previous lookup */
 105 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
 106                                         __be32 daddr, __be32 saddr)
 107 {
 108         fl4->flowi4_oif = oif;
 109         fl4->flowi4_tos = tos;
 110         fl4->daddr = daddr;
 111         fl4->saddr = saddr;
 112 }
 113
 114
 115 struct flowi6 {
 116         struct flowi_common     __fl_common;
 117 #define flowi6_oif              __fl_common.flowic_oif
 118 #define flowi6_iif              __fl_common.flowic_iif
 119 #define flowi6_mark             __fl_common.flowic_mark
 120 #define flowi6_tos              __fl_common.flowic_tos
 121 #define flowi6_scope            __fl_common.flowic_scope
 122 #define flowi6_proto            __fl_common.flowic_proto
 123 #define flowi6_flags            __fl_common.flowic_flags
 124 #define flowi6_secid            __fl_common.flowic_secid
 125         struct in6_addr         daddr;
 126         struct in6_addr         saddr;
 127         __be32                  flowlabel;
 128         union flowi_uli         uli;
 129 #define fl6_sport               uli.ports.sport
 130 #define fl6_dport               uli.ports.dport
 131 #define fl6_icmp_type           uli.icmpt.type
 132 #define fl6_icmp_code           uli.icmpt.code
 133 #define fl6_ipsec_spi           uli.spi
 134 #define fl6_mh_type             uli.mht.type
 135 #define fl6_gre_key             uli.gre_key
 136 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 137
 138 struct flowidn {
 139         struct flowi_common     __fl_common;
 140 #define flowidn_oif             __fl_common.flowic_oif
 141 #define flowidn_iif             __fl_common.flowic_iif
 142 #define flowidn_mark            __fl_common.flowic_mark
 143 #define flowidn_scope           __fl_common.flowic_scope
 144 #define flowidn_proto           __fl_common.flowic_proto
 145 #define flowidn_flags           __fl_common.flowic_flags
 146         __le16                  daddr;
 147         __le16                  saddr;
 148         union flowi_uli         uli;
 149 #define fld_sport               uli.ports.sport
 150 #define fld_dport               uli.ports.dport
 151 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 152
 153 struct flowi {
 154         union {
 155                 struct flowi_common     __fl_common;
 156                 struct flowi4           ip4;
 157                 struct flowi6           ip6;
 158                 struct flowidn          dn;
 159         } u;
 160 #define flowi_oif       u.__fl_common.flowic_oif
 161 #define flowi_iif       u.__fl_common.flowic_iif
 162 #define flowi_mark      u.__fl_common.flowic_mark
 163 #define flowi_tos       u.__fl_common.flowic_tos
 164 #define flowi_scope     u.__fl_common.flowic_scope
 165 #define flowi_proto     u.__fl_common.flowic_proto
 166 #define flowi_flags     u.__fl_common.flowic_flags
 167 #define flowi_secid     u.__fl_common.flowic_secid
 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 struct flow_cache_object *flow_cache_lookup(struct net *net,
 226                                             const struct flowi *key, u16 family,
 227                                             u8 dir, flow_resolve_t resolver,
 228                                             void *ctx);
 229 int flow_cache_init(struct net *net);
 230 void flow_cache_fini(struct net *net);
 231
 232 void flow_cache_flush(struct net *net);
 233 void flow_cache_flush_deferred(struct net *net);
 234 extern atomic_t flow_cache_genid;
 235
 236 #endif