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/socket.h> 12 #include <linux/in6.h> 13 #include <linux/atomic.h> 14 #include <net/flow_dissector.h> 15 #include <linux/uidgid.h> 16 17 /* 18 * ifindex generation is per-net namespace, and loopback is 19 * always the 1st device in ns (see net_dev_init), thus any 20 * loopback device should get ifindex 1 21 */ 22 23 #define LOOPBACK_IFINDEX 1 24 25 struct flowi_tunnel { 26 __be64 tun_id; 27 }; 28 29 struct flowi_common { 30 int flowic_oif; 31 int flowic_iif; 32 int flowic_l3mdev; 33 __u32 flowic_mark; 34 __u8 flowic_tos; 35 __u8 flowic_scope; 36 __u8 flowic_proto; 37 __u8 flowic_flags; 38 #define FLOWI_FLAG_ANYSRC 0x01 39 #define FLOWI_FLAG_KNOWN_NH 0x02 40 __u32 flowic_secid; 41 kuid_t flowic_uid; 42 struct flowi_tunnel flowic_tun_key; 43 __u32 flowic_multipath_hash; 44 }; 45 46 union flowi_uli { 47 struct { 48 __be16 dport; 49 __be16 sport; 50 } ports; 51 52 struct { 53 __u8 type; 54 __u8 code; 55 } icmpt; 56 57 struct { 58 __le16 dport; 59 __le16 sport; 60 } dnports; 61 62 __be32 gre_key; 63 64 struct { 65 __u8 type; 66 } mht; 67 }; 68 69 struct flowi4 { 70 struct flowi_common __fl_common; 71 #define flowi4_oif __fl_common.flowic_oif 72 #define flowi4_iif __fl_common.flowic_iif 73 #define flowi4_l3mdev __fl_common.flowic_l3mdev 74 #define flowi4_mark __fl_common.flowic_mark 75 #define flowi4_tos __fl_common.flowic_tos 76 #define flowi4_scope __fl_common.flowic_scope 77 #define flowi4_proto __fl_common.flowic_proto 78 #define flowi4_flags __fl_common.flowic_flags 79 #define flowi4_secid __fl_common.flowic_secid 80 #define flowi4_tun_key __fl_common.flowic_tun_key 81 #define flowi4_uid __fl_common.flowic_uid 82 #define flowi4_multipath_hash __fl_common.flowic_multipath_hash 83 84 /* (saddr,daddr) must be grouped, same order as in IP header */ 85 __be32 saddr; 86 __be32 daddr; 87 88 union flowi_uli uli; 89 #define fl4_sport uli.ports.sport 90 #define fl4_dport uli.ports.dport 91 #define fl4_icmp_type uli.icmpt.type 92 #define fl4_icmp_code uli.icmpt.code 93 #define fl4_mh_type uli.mht.type 94 #define fl4_gre_key uli.gre_key 95 } __attribute__((__aligned__(BITS_PER_LONG/8))); 96 97 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 98 __u32 mark, __u8 tos, __u8 scope, 99 __u8 proto, __u8 flags, 100 __be32 daddr, __be32 saddr, 101 __be16 dport, __be16 sport, 102 kuid_t uid) 103 { 104 fl4->flowi4_oif = oif; 105 fl4->flowi4_iif = LOOPBACK_IFINDEX; 106 fl4->flowi4_l3mdev = 0; 107 fl4->flowi4_mark = mark; 108 fl4->flowi4_tos = tos; 109 fl4->flowi4_scope = scope; 110 fl4->flowi4_proto = proto; 111 fl4->flowi4_flags = flags; 112 fl4->flowi4_secid = 0; 113 fl4->flowi4_tun_key.tun_id = 0; 114 fl4->flowi4_uid = uid; 115 fl4->daddr = daddr; 116 fl4->saddr = saddr; 117 fl4->fl4_dport = dport; 118 fl4->fl4_sport = sport; 119 fl4->flowi4_multipath_hash = 0; 120 } 121 122 /* Reset some input parameters after previous lookup */ 123 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 124 __be32 daddr, __be32 saddr) 125 { 126 fl4->flowi4_oif = oif; 127 fl4->flowi4_tos = tos; 128 fl4->daddr = daddr; 129 fl4->saddr = saddr; 130 } 131 132 133 struct flowi6 { 134 struct flowi_common __fl_common; 135 #define flowi6_oif __fl_common.flowic_oif 136 #define flowi6_iif __fl_common.flowic_iif 137 #define flowi6_l3mdev __fl_common.flowic_l3mdev 138 #define flowi6_mark __fl_common.flowic_mark 139 #define flowi6_scope __fl_common.flowic_scope 140 #define flowi6_proto __fl_common.flowic_proto 141 #define flowi6_flags __fl_common.flowic_flags 142 #define flowi6_secid __fl_common.flowic_secid 143 #define flowi6_tun_key __fl_common.flowic_tun_key 144 #define flowi6_uid __fl_common.flowic_uid 145 struct in6_addr daddr; 146 struct in6_addr saddr; 147 /* Note: flowi6_tos is encoded in flowlabel, too. */ 148 __be32 flowlabel; 149 union flowi_uli uli; 150 #define fl6_sport uli.ports.sport 151 #define fl6_dport uli.ports.dport 152 #define fl6_icmp_type uli.icmpt.type 153 #define fl6_icmp_code uli.icmpt.code 154 #define fl6_mh_type uli.mht.type 155 #define fl6_gre_key uli.gre_key 156 __u32 mp_hash; 157 } __attribute__((__aligned__(BITS_PER_LONG/8))); 158 159 struct flowidn { 160 struct flowi_common __fl_common; 161 #define flowidn_oif __fl_common.flowic_oif 162 #define flowidn_iif __fl_common.flowic_iif 163 #define flowidn_mark __fl_common.flowic_mark 164 #define flowidn_scope __fl_common.flowic_scope 165 #define flowidn_proto __fl_common.flowic_proto 166 #define flowidn_flags __fl_common.flowic_flags 167 __le16 daddr; 168 __le16 saddr; 169 union flowi_uli uli; 170 #define fld_sport uli.ports.sport 171 #define fld_dport uli.ports.dport 172 } __attribute__((__aligned__(BITS_PER_LONG/8))); 173 174 struct flowi { 175 union { 176 struct flowi_common __fl_common; 177 struct flowi4 ip4; 178 struct flowi6 ip6; 179 struct flowidn dn; 180 } u; 181 #define flowi_oif u.__fl_common.flowic_oif 182 #define flowi_iif u.__fl_common.flowic_iif 183 #define flowi_l3mdev u.__fl_common.flowic_l3mdev 184 #define flowi_mark u.__fl_common.flowic_mark 185 #define flowi_tos u.__fl_common.flowic_tos 186 #define flowi_scope u.__fl_common.flowic_scope 187 #define flowi_proto u.__fl_common.flowic_proto 188 #define flowi_flags u.__fl_common.flowic_flags 189 #define flowi_secid u.__fl_common.flowic_secid 190 #define flowi_tun_key u.__fl_common.flowic_tun_key 191 #define flowi_uid u.__fl_common.flowic_uid 192 } __attribute__((__aligned__(BITS_PER_LONG/8))); 193 194 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 195 { 196 return container_of(fl4, struct flowi, u.ip4); 197 } 198 199 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4) 200 { 201 return &(fl4->__fl_common); 202 } 203 204 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 205 { 206 return container_of(fl6, struct flowi, u.ip6); 207 } 208 209 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6) 210 { 211 return &(fl6->__fl_common); 212 } 213 214 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 215 { 216 return container_of(fldn, struct flowi, u.dn); 217 } 218 219 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 220 221 #endif 222