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 }; 44 45 union flowi_uli { 46 struct { 47 __be16 dport; 48 __be16 sport; 49 } ports; 50 51 struct { 52 __u8 type; 53 __u8 code; 54 } icmpt; 55 56 struct { 57 __le16 dport; 58 __le16 sport; 59 } dnports; 60 61 __be32 spi; 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_mark __fl_common.flowic_mark 74 #define flowi4_tos __fl_common.flowic_tos 75 #define flowi4_scope __fl_common.flowic_scope 76 #define flowi4_proto __fl_common.flowic_proto 77 #define flowi4_flags __fl_common.flowic_flags 78 #define flowi4_secid __fl_common.flowic_secid 79 #define flowi4_tun_key __fl_common.flowic_tun_key 80 #define flowi4_uid __fl_common.flowic_uid 81 82 /* (saddr,daddr) must be grouped, same order as in IP header */ 83 __be32 saddr; 84 __be32 daddr; 85 86 union flowi_uli uli; 87 #define fl4_sport uli.ports.sport 88 #define fl4_dport uli.ports.dport 89 #define fl4_icmp_type uli.icmpt.type 90 #define fl4_icmp_code uli.icmpt.code 91 #define fl4_ipsec_spi uli.spi 92 #define fl4_mh_type uli.mht.type 93 #define fl4_gre_key uli.gre_key 94 } __attribute__((__aligned__(BITS_PER_LONG/8))); 95 96 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 97 __u32 mark, __u8 tos, __u8 scope, 98 __u8 proto, __u8 flags, 99 __be32 daddr, __be32 saddr, 100 __be16 dport, __be16 sport, 101 kuid_t uid) 102 { 103 fl4->flowi4_oif = oif; 104 fl4->flowi4_iif = LOOPBACK_IFINDEX; 105 fl4->flowi4_mark = mark; 106 fl4->flowi4_tos = tos; 107 fl4->flowi4_scope = scope; 108 fl4->flowi4_proto = proto; 109 fl4->flowi4_flags = flags; 110 fl4->flowi4_secid = 0; 111 fl4->flowi4_tun_key.tun_id = 0; 112 fl4->flowi4_uid = uid; 113 fl4->daddr = daddr; 114 fl4->saddr = saddr; 115 fl4->fl4_dport = dport; 116 fl4->fl4_sport = sport; 117 } 118 119 /* Reset some input parameters after previous lookup */ 120 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 121 __be32 daddr, __be32 saddr) 122 { 123 fl4->flowi4_oif = oif; 124 fl4->flowi4_tos = tos; 125 fl4->daddr = daddr; 126 fl4->saddr = saddr; 127 } 128 129 130 struct flowi6 { 131 struct flowi_common __fl_common; 132 #define flowi6_oif __fl_common.flowic_oif 133 #define flowi6_iif __fl_common.flowic_iif 134 #define flowi6_mark __fl_common.flowic_mark 135 #define flowi6_scope __fl_common.flowic_scope 136 #define flowi6_proto __fl_common.flowic_proto 137 #define flowi6_flags __fl_common.flowic_flags 138 #define flowi6_secid __fl_common.flowic_secid 139 #define flowi6_tun_key __fl_common.flowic_tun_key 140 #define flowi6_uid __fl_common.flowic_uid 141 struct in6_addr daddr; 142 struct in6_addr saddr; 143 /* Note: flowi6_tos is encoded in flowlabel, too. */ 144 __be32 flowlabel; 145 union flowi_uli uli; 146 #define fl6_sport uli.ports.sport 147 #define fl6_dport uli.ports.dport 148 #define fl6_icmp_type uli.icmpt.type 149 #define fl6_icmp_code uli.icmpt.code 150 #define fl6_ipsec_spi uli.spi 151 #define fl6_mh_type uli.mht.type 152 #define fl6_gre_key uli.gre_key 153 __u32 mp_hash; 154 } __attribute__((__aligned__(BITS_PER_LONG/8))); 155 156 struct flowidn { 157 struct flowi_common __fl_common; 158 #define flowidn_oif __fl_common.flowic_oif 159 #define flowidn_iif __fl_common.flowic_iif 160 #define flowidn_mark __fl_common.flowic_mark 161 #define flowidn_scope __fl_common.flowic_scope 162 #define flowidn_proto __fl_common.flowic_proto 163 #define flowidn_flags __fl_common.flowic_flags 164 __le16 daddr; 165 __le16 saddr; 166 union flowi_uli uli; 167 #define fld_sport uli.ports.sport 168 #define fld_dport uli.ports.dport 169 } __attribute__((__aligned__(BITS_PER_LONG/8))); 170 171 struct flowi { 172 union { 173 struct flowi_common __fl_common; 174 struct flowi4 ip4; 175 struct flowi6 ip6; 176 struct flowidn dn; 177 } u; 178 #define flowi_oif u.__fl_common.flowic_oif 179 #define flowi_iif u.__fl_common.flowic_iif 180 #define flowi_mark u.__fl_common.flowic_mark 181 #define flowi_tos u.__fl_common.flowic_tos 182 #define flowi_scope u.__fl_common.flowic_scope 183 #define flowi_proto u.__fl_common.flowic_proto 184 #define flowi_flags u.__fl_common.flowic_flags 185 #define flowi_secid u.__fl_common.flowic_secid 186 #define flowi_tun_key u.__fl_common.flowic_tun_key 187 #define flowi_uid u.__fl_common.flowic_uid 188 } __attribute__((__aligned__(BITS_PER_LONG/8))); 189 190 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 191 { 192 return container_of(fl4, struct flowi, u.ip4); 193 } 194 195 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 196 { 197 return container_of(fl6, struct flowi, u.ip6); 198 } 199 200 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 201 { 202 return container_of(fldn, struct flowi, u.dn); 203 } 204 205 typedef unsigned long flow_compare_t; 206 207 static inline unsigned int flow_key_size(u16 family) 208 { 209 switch (family) { 210 case AF_INET: 211 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 212 return sizeof(struct flowi4) / sizeof(flow_compare_t); 213 case AF_INET6: 214 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 215 return sizeof(struct flowi6) / sizeof(flow_compare_t); 216 case AF_DECnet: 217 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 218 return sizeof(struct flowidn) / sizeof(flow_compare_t); 219 } 220 return 0; 221 } 222 223 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 224 225 #endif 226