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 25struct flowi_tunnel { 26 __be64 tun_id; 27}; 28 29struct 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 __u32 flowic_multipath_hash; 43 struct flowi_tunnel flowic_tun_key; 44}; 45 46union flowi_uli { 47 struct { 48 __be16 dport; 49 __be16 sport; 50 } ports; 51 52 struct { 53 __u8 type; 54 __u8 code; 55 } icmpt; 56 57 __be32 spi; 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_mark __fl_common.flowic_mark 70#define flowi4_tos __fl_common.flowic_tos 71#define flowi4_scope __fl_common.flowic_scope 72#define flowi4_proto __fl_common.flowic_proto 73#define flowi4_flags __fl_common.flowic_flags 74#define flowi4_secid __fl_common.flowic_secid 75#define flowi4_tun_key __fl_common.flowic_tun_key 76#define flowi4_uid __fl_common.flowic_uid 77#define flowi4_multipath_hash __fl_common.flowic_multipath_hash 78 79 /* (saddr,daddr) must be grouped, same order as in IP header */ 80 __be32 saddr; 81 __be32 daddr; 82 83 union flowi_uli uli; 84#define fl4_sport uli.ports.sport 85#define fl4_dport uli.ports.dport 86#define fl4_icmp_type uli.icmpt.type 87#define fl4_icmp_code uli.icmpt.code 88#define fl4_ipsec_spi uli.spi 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_mark = mark; 103 fl4->flowi4_tos = tos; 104 fl4->flowi4_scope = scope; 105 fl4->flowi4_proto = proto; 106 fl4->flowi4_flags = flags; 107 fl4->flowi4_secid = 0; 108 fl4->flowi4_tun_key.tun_id = 0; 109 fl4->flowi4_uid = uid; 110 fl4->daddr = daddr; 111 fl4->saddr = saddr; 112 fl4->fl4_dport = dport; 113 fl4->fl4_sport = sport; 114 fl4->flowi4_multipath_hash = 0; 115} 116 117/* Reset some input parameters after previous lookup */ 118static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 119 __be32 daddr, __be32 saddr) 120{ 121 fl4->flowi4_oif = oif; 122 fl4->flowi4_tos = tos; 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_mark __fl_common.flowic_mark 133#define flowi6_scope __fl_common.flowic_scope 134#define flowi6_proto __fl_common.flowic_proto 135#define flowi6_flags __fl_common.flowic_flags 136#define flowi6_secid __fl_common.flowic_secid 137#define flowi6_tun_key __fl_common.flowic_tun_key 138#define flowi6_uid __fl_common.flowic_uid 139 struct in6_addr daddr; 140 struct in6_addr saddr; 141 /* Note: flowi6_tos is encoded in flowlabel, too. */ 142 __be32 flowlabel; 143 union flowi_uli uli; 144#define fl6_sport uli.ports.sport 145#define fl6_dport uli.ports.dport 146#define fl6_icmp_type uli.icmpt.type 147#define fl6_icmp_code uli.icmpt.code 148#define fl6_ipsec_spi uli.spi 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_mark u.__fl_common.flowic_mark 163#define flowi_tos u.__fl_common.flowic_tos 164#define flowi_scope u.__fl_common.flowic_scope 165#define flowi_proto u.__fl_common.flowic_proto 166#define flowi_flags u.__fl_common.flowic_flags 167#define flowi_secid u.__fl_common.flowic_secid 168#define flowi_tun_key u.__fl_common.flowic_tun_key 169#define flowi_uid u.__fl_common.flowic_uid 170} __attribute__((__aligned__(BITS_PER_LONG/8))); 171 172static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 173{ 174 return container_of(fl4, struct flowi, u.ip4); 175} 176 177static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4) 178{ 179 return &(flowi4_to_flowi(fl4)->u.__fl_common); 180} 181 182static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 183{ 184 return container_of(fl6, struct flowi, u.ip6); 185} 186 187static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6) 188{ 189 return &(flowi6_to_flowi(fl6)->u.__fl_common); 190} 191 192__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 193 194#endif 195