Linux kernel mirror (for testing)
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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 __be32 gre_key;
58
59 struct {
60 __u8 type;
61 } mht;
62};
63
64struct flowi4 {
65 struct flowi_common __fl_common;
66#define flowi4_oif __fl_common.flowic_oif
67#define flowi4_iif __fl_common.flowic_iif
68#define flowi4_l3mdev __fl_common.flowic_l3mdev
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_mh_type uli.mht.type
89#define fl4_gre_key uli.gre_key
90} __attribute__((__aligned__(BITS_PER_LONG/8)));
91
92static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
93 __u32 mark, __u8 tos, __u8 scope,
94 __u8 proto, __u8 flags,
95 __be32 daddr, __be32 saddr,
96 __be16 dport, __be16 sport,
97 kuid_t uid)
98{
99 fl4->flowi4_oif = oif;
100 fl4->flowi4_iif = LOOPBACK_IFINDEX;
101 fl4->flowi4_l3mdev = 0;
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_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