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 #include <net/inet_dscp.h> 16 17 struct flow_keys; 18 19 /* 20 * ifindex generation is per-net namespace, and loopback is 21 * always the 1st device in ns (see net_dev_init), thus any 22 * loopback device should get ifindex 1 23 */ 24 25 #define LOOPBACK_IFINDEX 1 26 27 struct flowi_tunnel { 28 __be64 tun_id; 29 }; 30 31 struct flowi_common { 32 int flowic_oif; 33 int flowic_iif; 34 int flowic_l3mdev; 35 __u32 flowic_mark; 36 dscp_t flowic_dscp; 37 __u8 flowic_scope; 38 __u8 flowic_proto; 39 __u8 flowic_flags; 40 #define FLOWI_FLAG_ANYSRC 0x01 41 #define FLOWI_FLAG_KNOWN_NH 0x02 42 #define FLOWI_FLAG_L3MDEV_OIF 0x04 43 #define FLOWI_FLAG_ANY_SPORT 0x08 44 __u32 flowic_secid; 45 kuid_t flowic_uid; 46 __u32 flowic_multipath_hash; 47 struct flowi_tunnel flowic_tun_key; 48 }; 49 50 union flowi_uli { 51 struct { 52 __be16 dport; 53 __be16 sport; 54 } ports; 55 56 struct { 57 __u8 type; 58 __u8 code; 59 } icmpt; 60 61 __be32 gre_key; 62 63 struct { 64 __u8 type; 65 } mht; 66 }; 67 68 struct flowi4 { 69 struct flowi_common __fl_common; 70 #define flowi4_oif __fl_common.flowic_oif 71 #define flowi4_iif __fl_common.flowic_iif 72 #define flowi4_l3mdev __fl_common.flowic_l3mdev 73 #define flowi4_mark __fl_common.flowic_mark 74 #define flowi4_dscp __fl_common.flowic_dscp 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 #define flowi4_multipath_hash __fl_common.flowic_multipath_hash 82 83 /* (saddr,daddr) must be grouped, same order as in IP header */ 84 __be32 saddr; 85 __be32 daddr; 86 87 union flowi_uli uli; 88 #define fl4_sport uli.ports.sport 89 #define fl4_dport uli.ports.dport 90 #define fl4_icmp_type uli.icmpt.type 91 #define fl4_icmp_code uli.icmpt.code 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_l3mdev = 0; 106 fl4->flowi4_mark = mark; 107 fl4->flowi4_dscp = inet_dsfield_to_dscp(tos); 108 fl4->flowi4_scope = scope; 109 fl4->flowi4_proto = proto; 110 fl4->flowi4_flags = flags; 111 fl4->flowi4_secid = 0; 112 fl4->flowi4_tun_key.tun_id = 0; 113 fl4->flowi4_uid = uid; 114 fl4->daddr = daddr; 115 fl4->saddr = saddr; 116 fl4->fl4_dport = dport; 117 fl4->fl4_sport = sport; 118 fl4->flowi4_multipath_hash = 0; 119 } 120 121 /* Reset some input parameters after previous lookup */ 122 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, 123 __be32 daddr, __be32 saddr) 124 { 125 fl4->flowi4_oif = oif; 126 fl4->daddr = daddr; 127 fl4->saddr = saddr; 128 } 129 130 131 struct flowi6 { 132 struct flowi_common __fl_common; 133 #define flowi6_oif __fl_common.flowic_oif 134 #define flowi6_iif __fl_common.flowic_iif 135 #define flowi6_l3mdev __fl_common.flowic_l3mdev 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_dscp 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_mh_type uli.mht.type 153 #define fl6_gre_key uli.gre_key 154 __u32 mp_hash; 155 } __attribute__((__aligned__(BITS_PER_LONG/8))); 156 157 struct flowi { 158 union { 159 struct flowi_common __fl_common; 160 struct flowi4 ip4; 161 struct flowi6 ip6; 162 } u; 163 #define flowi_oif u.__fl_common.flowic_oif 164 #define flowi_iif u.__fl_common.flowic_iif 165 #define flowi_l3mdev u.__fl_common.flowic_l3mdev 166 #define flowi_mark u.__fl_common.flowic_mark 167 #define flowi_dscp u.__fl_common.flowic_dscp 168 #define flowi_scope u.__fl_common.flowic_scope 169 #define flowi_proto u.__fl_common.flowic_proto 170 #define flowi_flags u.__fl_common.flowic_flags 171 #define flowi_secid u.__fl_common.flowic_secid 172 #define flowi_tun_key u.__fl_common.flowic_tun_key 173 #define flowi_uid u.__fl_common.flowic_uid 174 } __attribute__((__aligned__(BITS_PER_LONG/8))); 175 176 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 177 { 178 return container_of(fl4, struct flowi, u.ip4); 179 } 180 181 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4) 182 { 183 return &(fl4->__fl_common); 184 } 185 186 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 187 { 188 return container_of(fl6, struct flowi, u.ip6); 189 } 190 191 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6) 192 { 193 return &(fl6->__fl_common); 194 } 195 196 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 197 198 #endif 199