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 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 } 120 121 /* Reset some input parameters after previous lookup */ 122 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 123 __be32 daddr, __be32 saddr) 124 { 125 fl4->flowi4_oif = oif; 126 fl4->flowi4_tos = tos; 127 fl4->daddr = daddr; 128 fl4->saddr = saddr; 129 } 130 131 132 struct flowi6 { 133 struct flowi_common __fl_common; 134 #define flowi6_oif __fl_common.flowic_oif 135 #define flowi6_iif __fl_common.flowic_iif 136 #define flowi6_mark __fl_common.flowic_mark 137 #define flowi6_scope __fl_common.flowic_scope 138 #define flowi6_proto __fl_common.flowic_proto 139 #define flowi6_flags __fl_common.flowic_flags 140 #define flowi6_secid __fl_common.flowic_secid 141 #define flowi6_tun_key __fl_common.flowic_tun_key 142 #define flowi6_uid __fl_common.flowic_uid 143 struct in6_addr daddr; 144 struct in6_addr saddr; 145 /* Note: flowi6_tos is encoded in flowlabel, too. */ 146 __be32 flowlabel; 147 union flowi_uli uli; 148 #define fl6_sport uli.ports.sport 149 #define fl6_dport uli.ports.dport 150 #define fl6_icmp_type uli.icmpt.type 151 #define fl6_icmp_code uli.icmpt.code 152 #define fl6_ipsec_spi uli.spi 153 #define fl6_mh_type uli.mht.type 154 #define fl6_gre_key uli.gre_key 155 __u32 mp_hash; 156 } __attribute__((__aligned__(BITS_PER_LONG/8))); 157 158 struct flowidn { 159 struct flowi_common __fl_common; 160 #define flowidn_oif __fl_common.flowic_oif 161 #define flowidn_iif __fl_common.flowic_iif 162 #define flowidn_mark __fl_common.flowic_mark 163 #define flowidn_scope __fl_common.flowic_scope 164 #define flowidn_proto __fl_common.flowic_proto 165 #define flowidn_flags __fl_common.flowic_flags 166 __le16 daddr; 167 __le16 saddr; 168 union flowi_uli uli; 169 #define fld_sport uli.ports.sport 170 #define fld_dport uli.ports.dport 171 } __attribute__((__aligned__(BITS_PER_LONG/8))); 172 173 struct flowi { 174 union { 175 struct flowi_common __fl_common; 176 struct flowi4 ip4; 177 struct flowi6 ip6; 178 struct flowidn dn; 179 } u; 180 #define flowi_oif u.__fl_common.flowic_oif 181 #define flowi_iif u.__fl_common.flowic_iif 182 #define flowi_mark u.__fl_common.flowic_mark 183 #define flowi_tos u.__fl_common.flowic_tos 184 #define flowi_scope u.__fl_common.flowic_scope 185 #define flowi_proto u.__fl_common.flowic_proto 186 #define flowi_flags u.__fl_common.flowic_flags 187 #define flowi_secid u.__fl_common.flowic_secid 188 #define flowi_tun_key u.__fl_common.flowic_tun_key 189 #define flowi_uid u.__fl_common.flowic_uid 190 } __attribute__((__aligned__(BITS_PER_LONG/8))); 191 192 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 193 { 194 return container_of(fl4, struct flowi, u.ip4); 195 } 196 197 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 198 { 199 return container_of(fl6, struct flowi, u.ip6); 200 } 201 202 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 203 { 204 return container_of(fldn, struct flowi, u.dn); 205 } 206 207 typedef unsigned long flow_compare_t; 208 209 static inline unsigned int flow_key_size(u16 family) 210 { 211 switch (family) { 212 case AF_INET: 213 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 214 return sizeof(struct flowi4) / sizeof(flow_compare_t); 215 case AF_INET6: 216 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 217 return sizeof(struct flowi6) / sizeof(flow_compare_t); 218 case AF_DECnet: 219 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 220 return sizeof(struct flowidn) / sizeof(flow_compare_t); 221 } 222 return 0; 223 } 224 225 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 226 227 #endif 228