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 16struct 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 26struct flowi_tunnel { 27 __be64 tun_id; 28}; 29 30struct 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 __u32 flowic_multipath_hash; 44 struct flowi_tunnel flowic_tun_key; 45}; 46 47union 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 65struct 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 93static 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 */ 119static 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 128struct 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 154struct 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 173static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 174{ 175 return container_of(fl4, struct flowi, u.ip4); 176} 177 178static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4) 179{ 180 return &(fl4->__fl_common); 181} 182 183static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 184{ 185 return container_of(fl6, struct flowi, u.ip6); 186} 187 188static 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