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 #define FLOWI_FLAG_L3MDEV_OIF 0x04 42 #define FLOWI_FLAG_ANY_SPORT 0x08 43 __u32 flowic_secid; 44 kuid_t flowic_uid; 45 __u32 flowic_multipath_hash; 46 struct flowi_tunnel flowic_tun_key; 47 }; 48 49 union flowi_uli { 50 struct { 51 __be16 dport; 52 __be16 sport; 53 } ports; 54 55 struct { 56 __u8 type; 57 __u8 code; 58 } icmpt; 59 60 __be32 gre_key; 61 62 struct { 63 __u8 type; 64 } mht; 65 }; 66 67 struct flowi4 { 68 struct flowi_common __fl_common; 69 #define flowi4_oif __fl_common.flowic_oif 70 #define flowi4_iif __fl_common.flowic_iif 71 #define flowi4_l3mdev __fl_common.flowic_l3mdev 72 #define flowi4_mark __fl_common.flowic_mark 73 #define flowi4_tos __fl_common.flowic_tos 74 #define flowi4_scope __fl_common.flowic_scope 75 #define flowi4_proto __fl_common.flowic_proto 76 #define flowi4_flags __fl_common.flowic_flags 77 #define flowi4_secid __fl_common.flowic_secid 78 #define flowi4_tun_key __fl_common.flowic_tun_key 79 #define flowi4_uid __fl_common.flowic_uid 80 #define flowi4_multipath_hash __fl_common.flowic_multipath_hash 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_mh_type uli.mht.type 92 #define fl4_gre_key uli.gre_key 93 } __attribute__((__aligned__(BITS_PER_LONG/8))); 94 95 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 96 __u32 mark, __u8 tos, __u8 scope, 97 __u8 proto, __u8 flags, 98 __be32 daddr, __be32 saddr, 99 __be16 dport, __be16 sport, 100 kuid_t uid) 101 { 102 fl4->flowi4_oif = oif; 103 fl4->flowi4_iif = LOOPBACK_IFINDEX; 104 fl4->flowi4_l3mdev = 0; 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 fl4->flowi4_multipath_hash = 0; 118 } 119 120 /* Reset some input parameters after previous lookup */ 121 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, 122 __be32 daddr, __be32 saddr) 123 { 124 fl4->flowi4_oif = oif; 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_l3mdev __fl_common.flowic_l3mdev 135 #define flowi6_mark __fl_common.flowic_mark 136 #define flowi6_scope __fl_common.flowic_scope 137 #define flowi6_proto __fl_common.flowic_proto 138 #define flowi6_flags __fl_common.flowic_flags 139 #define flowi6_secid __fl_common.flowic_secid 140 #define flowi6_tun_key __fl_common.flowic_tun_key 141 #define flowi6_uid __fl_common.flowic_uid 142 struct in6_addr daddr; 143 struct in6_addr saddr; 144 /* Note: flowi6_tos is encoded in flowlabel, too. */ 145 __be32 flowlabel; 146 union flowi_uli uli; 147 #define fl6_sport uli.ports.sport 148 #define fl6_dport uli.ports.dport 149 #define fl6_icmp_type uli.icmpt.type 150 #define fl6_icmp_code uli.icmpt.code 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 flowi { 157 union { 158 struct flowi_common __fl_common; 159 struct flowi4 ip4; 160 struct flowi6 ip6; 161 } u; 162 #define flowi_oif u.__fl_common.flowic_oif 163 #define flowi_iif u.__fl_common.flowic_iif 164 #define flowi_l3mdev u.__fl_common.flowic_l3mdev 165 #define flowi_mark u.__fl_common.flowic_mark 166 #define flowi_tos u.__fl_common.flowic_tos 167 #define flowi_scope u.__fl_common.flowic_scope 168 #define flowi_proto u.__fl_common.flowic_proto 169 #define flowi_flags u.__fl_common.flowic_flags 170 #define flowi_secid u.__fl_common.flowic_secid 171 #define flowi_tun_key u.__fl_common.flowic_tun_key 172 #define flowi_uid u.__fl_common.flowic_uid 173 } __attribute__((__aligned__(BITS_PER_LONG/8))); 174 175 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 176 { 177 return container_of(fl4, struct flowi, u.ip4); 178 } 179 180 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4) 181 { 182 return &(fl4->__fl_common); 183 } 184 185 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 186 { 187 return container_of(fl6, struct flowi, u.ip6); 188 } 189 190 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6) 191 { 192 return &(fl6->__fl_common); 193 } 194 195 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 196 197 #endif 198