include/net/flow.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *
   4  *      Generic internet FLOW.
   5  *
   6  */
   7
   8 #ifndef _NET_FLOW_H
   9 #define _NET_FLOW_H
  10
  11 #include <linux/in6.h>
  12 #include <linux/atomic.h>
  13 #include <linux/container_of.h>
  14 #include <linux/uidgid.h>
  15
  16 struct flow_keys;
  17
  18 /*
  19  * ifindex generation is per-net namespace, and loopback is
  20  * always the 1st device in ns (see net_dev_init), thus any
  21  * loopback device should get ifindex 1
  22  */
  23
  24 #define LOOPBACK_IFINDEX        1
  25
  26 struct flowi_tunnel {
  27         __be64                  tun_id;
  28 };
  29
  30 struct flowi_common {
  31         int     flowic_oif;
  32         int     flowic_iif;
  33         int     flowic_l3mdev;
  34         __u32   flowic_mark;
  35         __u8    flowic_tos;
  36         __u8    flowic_scope;
  37         __u8    flowic_proto;
  38         __u8    flowic_flags;
  39 #define FLOWI_FLAG_ANYSRC               0x01
  40 #define FLOWI_FLAG_KNOWN_NH             0x02
  41         __u32   flowic_secid;
  42         kuid_t  flowic_uid;
  43         __u32           flowic_multipath_hash;
  44         struct flowi_tunnel flowic_tun_key;
  45 };
  46
  47 union flowi_uli {
  48         struct {
  49                 __be16  dport;
  50                 __be16  sport;
  51         } ports;
  52
  53         struct {
  54                 __u8    type;
  55                 __u8    code;
  56         } icmpt;
  57
  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_l3mdev           __fl_common.flowic_l3mdev
  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 #define flowi4_uid              __fl_common.flowic_uid
  78 #define flowi4_multipath_hash   __fl_common.flowic_multipath_hash
  79
  80         /* (saddr,daddr) must be grouped, same order as in IP header */
  81         __be32                  saddr;
  82         __be32                  daddr;
  83
  84         union flowi_uli         uli;
  85 #define fl4_sport               uli.ports.sport
  86 #define fl4_dport               uli.ports.dport
  87 #define fl4_icmp_type           uli.icmpt.type
  88 #define fl4_icmp_code           uli.icmpt.code
  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                                       kuid_t uid)
  99 {
 100         fl4->flowi4_oif = oif;
 101         fl4->flowi4_iif = LOOPBACK_IFINDEX;
 102         fl4->flowi4_l3mdev = 0;
 103         fl4->flowi4_mark = mark;
 104         fl4->flowi4_tos = tos;
 105         fl4->flowi4_scope = scope;
 106         fl4->flowi4_proto = proto;
 107         fl4->flowi4_flags = flags;
 108         fl4->flowi4_secid = 0;
 109         fl4->flowi4_tun_key.tun_id = 0;
 110         fl4->flowi4_uid = uid;
 111         fl4->daddr = daddr;
 112         fl4->saddr = saddr;
 113         fl4->fl4_dport = dport;
 114         fl4->fl4_sport = sport;
 115         fl4->flowi4_multipath_hash = 0;
 116 }
 117
 118 /* Reset some input parameters after previous lookup */
 119 static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
 120                                         __be32 daddr, __be32 saddr)
 121 {
 122         fl4->flowi4_oif = oif;
 123         fl4->daddr = daddr;
 124         fl4->saddr = saddr;
 125 }
 126
 127
 128 struct flowi6 {
 129         struct flowi_common     __fl_common;
 130 #define flowi6_oif              __fl_common.flowic_oif
 131 #define flowi6_iif              __fl_common.flowic_iif
 132 #define flowi6_l3mdev           __fl_common.flowic_l3mdev
 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_mh_type             uli.mht.type
 150 #define fl6_gre_key             uli.gre_key
 151         __u32                   mp_hash;
 152 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 153
 154 struct flowi {
 155         union {
 156                 struct flowi_common     __fl_common;
 157                 struct flowi4           ip4;
 158                 struct flowi6           ip6;
 159         } u;
 160 #define flowi_oif       u.__fl_common.flowic_oif
 161 #define flowi_iif       u.__fl_common.flowic_iif
 162 #define flowi_l3mdev    u.__fl_common.flowic_l3mdev
 163 #define flowi_mark      u.__fl_common.flowic_mark
 164 #define flowi_tos       u.__fl_common.flowic_tos
 165 #define flowi_scope     u.__fl_common.flowic_scope
 166 #define flowi_proto     u.__fl_common.flowic_proto
 167 #define flowi_flags     u.__fl_common.flowic_flags
 168 #define flowi_secid     u.__fl_common.flowic_secid
 169 #define flowi_tun_key   u.__fl_common.flowic_tun_key
 170 #define flowi_uid       u.__fl_common.flowic_uid
 171 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 172
 173 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 174 {
 175         return container_of(fl4, struct flowi, u.ip4);
 176 }
 177
 178 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
 179 {
 180         return &(fl4->__fl_common);
 181 }
 182
 183 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 184 {
 185         return container_of(fl6, struct flowi, u.ip6);
 186 }
 187
 188 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
 189 {
 190         return &(fl6->__fl_common);
 191 }
 192
 193 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
 194
 195 #endif