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

source code of linux/include/net/flow.h