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 __u32 flowic_mark; 33 __u8 flowic_tos; 34 __u8 flowic_scope; 35 __u8 flowic_proto; 36 __u8 flowic_flags; 37 #define FLOWI_FLAG_ANYSRC 0x01 38 #define FLOWI_FLAG_KNOWN_NH 0x02 39 #define FLOWI_FLAG_SKIP_NH_OIF 0x04 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 spi; 63 __be32 gre_key; 64 65 struct { 66 __u8 type; 67 } mht; 68 }; 69 70 struct flowi4 { 71 struct flowi_common __fl_common; 72 #define flowi4_oif __fl_common.flowic_oif 73 #define flowi4_iif __fl_common.flowic_iif 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_ipsec_spi uli.spi 94 #define fl4_mh_type uli.mht.type 95 #define fl4_gre_key uli.gre_key 96 } __attribute__((__aligned__(BITS_PER_LONG/8))); 97 flowi4_init_output(struct flowi4 * fl4,int oif,__u32 mark,__u8 tos,__u8 scope,__u8 proto,__u8 flags,__be32 daddr,__be32 saddr,__be16 dport,__be16 sport,kuid_t uid)98 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 99 __u32 mark, __u8 tos, __u8 scope, 100 __u8 proto, __u8 flags, 101 __be32 daddr, __be32 saddr, 102 __be16 dport, __be16 sport, 103 kuid_t uid) 104 { 105 fl4->flowi4_oif = oif; 106 fl4->flowi4_iif = LOOPBACK_IFINDEX; 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 */ flowi4_update_output(struct flowi4 * fl4,int oif,__u8 tos,__be32 daddr,__be32 saddr)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_mark __fl_common.flowic_mark 138 #define flowi6_scope __fl_common.flowic_scope 139 #define flowi6_proto __fl_common.flowic_proto 140 #define flowi6_flags __fl_common.flowic_flags 141 #define flowi6_secid __fl_common.flowic_secid 142 #define flowi6_tun_key __fl_common.flowic_tun_key 143 #define flowi6_uid __fl_common.flowic_uid 144 struct in6_addr daddr; 145 struct in6_addr saddr; 146 /* Note: flowi6_tos is encoded in flowlabel, too. */ 147 __be32 flowlabel; 148 union flowi_uli uli; 149 #define fl6_sport uli.ports.sport 150 #define fl6_dport uli.ports.dport 151 #define fl6_icmp_type uli.icmpt.type 152 #define fl6_icmp_code uli.icmpt.code 153 #define fl6_ipsec_spi uli.spi 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_mark u.__fl_common.flowic_mark 184 #define flowi_tos u.__fl_common.flowic_tos 185 #define flowi_scope u.__fl_common.flowic_scope 186 #define flowi_proto u.__fl_common.flowic_proto 187 #define flowi_flags u.__fl_common.flowic_flags 188 #define flowi_secid u.__fl_common.flowic_secid 189 #define flowi_tun_key u.__fl_common.flowic_tun_key 190 #define flowi_uid u.__fl_common.flowic_uid 191 } __attribute__((__aligned__(BITS_PER_LONG/8))); 192 flowi4_to_flowi(struct flowi4 * fl4)193 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 194 { 195 return container_of(fl4, struct flowi, u.ip4); 196 } 197 flowi4_to_flowi_common(struct flowi4 * fl4)198 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4) 199 { 200 return &(flowi4_to_flowi(fl4)->u.__fl_common); 201 } 202 flowi6_to_flowi(struct flowi6 * fl6)203 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 204 { 205 return container_of(fl6, struct flowi, u.ip6); 206 } 207 flowi6_to_flowi_common(struct flowi6 * fl6)208 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6) 209 { 210 return &(flowi6_to_flowi(fl6)->u.__fl_common); 211 } 212 flowidn_to_flowi(struct flowidn * fldn)213 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 214 { 215 return container_of(fldn, struct flowi, u.dn); 216 } 217 218 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 219 220 #endif 221