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 int flowic_l3mdev;
33 __u32 flowic_mark;
34 __u8 flowic_tos;
35 __u8 flowic_scope;
36 __u8 flowic_proto;
37 __u8 flowic_flags;
38#define FLOWI_FLAG_ANYSRC 0x01
39#define FLOWI_FLAG_KNOWN_NH 0x02
40 __u32 flowic_secid;
41 kuid_t flowic_uid;
42 struct flowi_tunnel flowic_tun_key;
43 __u32 flowic_multipath_hash;
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 struct {
58 __le16 dport;
59 __le16 sport;
60 } dnports;
61
62 __be32 gre_key;
63
64 struct {
65 __u8 type;
66 } mht;
67};
68
69struct flowi4 {
70 struct flowi_common __fl_common;
71#define flowi4_oif __fl_common.flowic_oif
72#define flowi4_iif __fl_common.flowic_iif
73#define flowi4_l3mdev __fl_common.flowic_l3mdev
74#define flowi4_mark __fl_common.flowic_mark
75#define flowi4_tos __fl_common.flowic_tos
76#define flowi4_scope __fl_common.flowic_scope
77#define flowi4_proto __fl_common.flowic_proto
78#define flowi4_flags __fl_common.flowic_flags
79#define flowi4_secid __fl_common.flowic_secid
80#define flowi4_tun_key __fl_common.flowic_tun_key
81#define flowi4_uid __fl_common.flowic_uid
82#define flowi4_multipath_hash __fl_common.flowic_multipath_hash
83
84 /* (saddr,daddr) must be grouped, same order as in IP header */
85 __be32 saddr;
86 __be32 daddr;
87
88 union flowi_uli uli;
89#define fl4_sport uli.ports.sport
90#define fl4_dport uli.ports.dport
91#define fl4_icmp_type uli.icmpt.type
92#define fl4_icmp_code uli.icmpt.code
93#define fl4_mh_type uli.mht.type
94#define fl4_gre_key uli.gre_key
95} __attribute__((__aligned__(BITS_PER_LONG/8)));
96
97static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
98 __u32 mark, __u8 tos, __u8 scope,
99 __u8 proto, __u8 flags,
100 __be32 daddr, __be32 saddr,
101 __be16 dport, __be16 sport,
102 kuid_t uid)
103{
104 fl4->flowi4_oif = oif;
105 fl4->flowi4_iif = LOOPBACK_IFINDEX;
106 fl4->flowi4_l3mdev = 0;
107 fl4->flowi4_mark = mark;
108 fl4->flowi4_tos = tos;
109 fl4->flowi4_scope = scope;
110 fl4->flowi4_proto = proto;
111 fl4->flowi4_flags = flags;
112 fl4->flowi4_secid = 0;
113 fl4->flowi4_tun_key.tun_id = 0;
114 fl4->flowi4_uid = uid;
115 fl4->daddr = daddr;
116 fl4->saddr = saddr;
117 fl4->fl4_dport = dport;
118 fl4->fl4_sport = sport;
119 fl4->flowi4_multipath_hash = 0;
120}
121
122/* Reset some input parameters after previous lookup */
123static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
124 __be32 daddr, __be32 saddr)
125{
126 fl4->flowi4_oif = oif;
127 fl4->flowi4_tos = tos;
128 fl4->daddr = daddr;
129 fl4->saddr = saddr;
130}
131
132
133struct flowi6 {
134 struct flowi_common __fl_common;
135#define flowi6_oif __fl_common.flowic_oif
136#define flowi6_iif __fl_common.flowic_iif
137#define flowi6_l3mdev __fl_common.flowic_l3mdev
138#define flowi6_mark __fl_common.flowic_mark
139#define flowi6_scope __fl_common.flowic_scope
140#define flowi6_proto __fl_common.flowic_proto
141#define flowi6_flags __fl_common.flowic_flags
142#define flowi6_secid __fl_common.flowic_secid
143#define flowi6_tun_key __fl_common.flowic_tun_key
144#define flowi6_uid __fl_common.flowic_uid
145 struct in6_addr daddr;
146 struct in6_addr saddr;
147 /* Note: flowi6_tos is encoded in flowlabel, too. */
148 __be32 flowlabel;
149 union flowi_uli uli;
150#define fl6_sport uli.ports.sport
151#define fl6_dport uli.ports.dport
152#define fl6_icmp_type uli.icmpt.type
153#define fl6_icmp_code uli.icmpt.code
154#define fl6_mh_type uli.mht.type
155#define fl6_gre_key uli.gre_key
156 __u32 mp_hash;
157} __attribute__((__aligned__(BITS_PER_LONG/8)));
158
159struct flowidn {
160 struct flowi_common __fl_common;
161#define flowidn_oif __fl_common.flowic_oif
162#define flowidn_iif __fl_common.flowic_iif
163#define flowidn_mark __fl_common.flowic_mark
164#define flowidn_scope __fl_common.flowic_scope
165#define flowidn_proto __fl_common.flowic_proto
166#define flowidn_flags __fl_common.flowic_flags
167 __le16 daddr;
168 __le16 saddr;
169 union flowi_uli uli;
170#define fld_sport uli.ports.sport
171#define fld_dport uli.ports.dport
172} __attribute__((__aligned__(BITS_PER_LONG/8)));
173
174struct flowi {
175 union {
176 struct flowi_common __fl_common;
177 struct flowi4 ip4;
178 struct flowi6 ip6;
179 struct flowidn dn;
180 } u;
181#define flowi_oif u.__fl_common.flowic_oif
182#define flowi_iif u.__fl_common.flowic_iif
183#define flowi_l3mdev u.__fl_common.flowic_l3mdev
184#define flowi_mark u.__fl_common.flowic_mark
185#define flowi_tos u.__fl_common.flowic_tos
186#define flowi_scope u.__fl_common.flowic_scope
187#define flowi_proto u.__fl_common.flowic_proto
188#define flowi_flags u.__fl_common.flowic_flags
189#define flowi_secid u.__fl_common.flowic_secid
190#define flowi_tun_key u.__fl_common.flowic_tun_key
191#define flowi_uid u.__fl_common.flowic_uid
192} __attribute__((__aligned__(BITS_PER_LONG/8)));
193
194static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
195{
196 return container_of(fl4, struct flowi, u.ip4);
197}
198
199static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
200{
201 return &(fl4->__fl_common);
202}
203
204static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
205{
206 return container_of(fl6, struct flowi, u.ip6);
207}
208
209static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
210{
211 return &(fl6->__fl_common);
212}
213
214static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
215{
216 return container_of(fldn, struct flowi, u.dn);
217}
218
219__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
220
221#endif
222

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