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 struct flowi_tunnel flowic_tun_key; 44 __u32 flowic_multipath_hash; 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 196