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/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#define FLOWI_FLAG_L3MDEV_OIF 0x04
42#define FLOWI_FLAG_ANY_SPORT 0x08
43 __u32 flowic_secid;
44 kuid_t flowic_uid;
45 __u32 flowic_multipath_hash;
46 struct flowi_tunnel flowic_tun_key;
47};
48
49union flowi_uli {
50 struct {
51 __be16 dport;
52 __be16 sport;
53 } ports;
54
55 struct {
56 __u8 type;
57 __u8 code;
58 } icmpt;
59
60 __be32 gre_key;
61
62 struct {
63 __u8 type;
64 } mht;
65};
66
67struct flowi4 {
68 struct flowi_common __fl_common;
69#define flowi4_oif __fl_common.flowic_oif
70#define flowi4_iif __fl_common.flowic_iif
71#define flowi4_l3mdev __fl_common.flowic_l3mdev
72#define flowi4_mark __fl_common.flowic_mark
73#define flowi4_tos __fl_common.flowic_tos
74#define flowi4_scope __fl_common.flowic_scope
75#define flowi4_proto __fl_common.flowic_proto
76#define flowi4_flags __fl_common.flowic_flags
77#define flowi4_secid __fl_common.flowic_secid
78#define flowi4_tun_key __fl_common.flowic_tun_key
79#define flowi4_uid __fl_common.flowic_uid
80#define flowi4_multipath_hash __fl_common.flowic_multipath_hash
81
82 /* (saddr,daddr) must be grouped, same order as in IP header */
83 __be32 saddr;
84 __be32 daddr;
85
86 union flowi_uli uli;
87#define fl4_sport uli.ports.sport
88#define fl4_dport uli.ports.dport
89#define fl4_icmp_type uli.icmpt.type
90#define fl4_icmp_code uli.icmpt.code
91#define fl4_mh_type uli.mht.type
92#define fl4_gre_key uli.gre_key
93} __attribute__((__aligned__(BITS_PER_LONG/8)));
94
95static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
96 __u32 mark, __u8 tos, __u8 scope,
97 __u8 proto, __u8 flags,
98 __be32 daddr, __be32 saddr,
99 __be16 dport, __be16 sport,
100 kuid_t uid)
101{
102 fl4->flowi4_oif = oif;
103 fl4->flowi4_iif = LOOPBACK_IFINDEX;
104 fl4->flowi4_l3mdev = 0;
105 fl4->flowi4_mark = mark;
106 fl4->flowi4_tos = tos;
107 fl4->flowi4_scope = scope;
108 fl4->flowi4_proto = proto;
109 fl4->flowi4_flags = flags;
110 fl4->flowi4_secid = 0;
111 fl4->flowi4_tun_key.tun_id = 0;
112 fl4->flowi4_uid = uid;
113 fl4->daddr = daddr;
114 fl4->saddr = saddr;
115 fl4->fl4_dport = dport;
116 fl4->fl4_sport = sport;
117 fl4->flowi4_multipath_hash = 0;
118}
119
120/* Reset some input parameters after previous lookup */
121static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
122 __be32 daddr, __be32 saddr)
123{
124 fl4->flowi4_oif = oif;
125 fl4->daddr = daddr;
126 fl4->saddr = saddr;
127}
128
129
130struct flowi6 {
131 struct flowi_common __fl_common;
132#define flowi6_oif __fl_common.flowic_oif
133#define flowi6_iif __fl_common.flowic_iif
134#define flowi6_l3mdev __fl_common.flowic_l3mdev
135#define flowi6_mark __fl_common.flowic_mark
136#define flowi6_scope __fl_common.flowic_scope
137#define flowi6_proto __fl_common.flowic_proto
138#define flowi6_flags __fl_common.flowic_flags
139#define flowi6_secid __fl_common.flowic_secid
140#define flowi6_tun_key __fl_common.flowic_tun_key
141#define flowi6_uid __fl_common.flowic_uid
142 struct in6_addr daddr;
143 struct in6_addr saddr;
144 /* Note: flowi6_tos is encoded in flowlabel, too. */
145 __be32 flowlabel;
146 union flowi_uli uli;
147#define fl6_sport uli.ports.sport
148#define fl6_dport uli.ports.dport
149#define fl6_icmp_type uli.icmpt.type
150#define fl6_icmp_code uli.icmpt.code
151#define fl6_mh_type uli.mht.type
152#define fl6_gre_key uli.gre_key
153 __u32 mp_hash;
154} __attribute__((__aligned__(BITS_PER_LONG/8)));
155
156struct flowi {
157 union {
158 struct flowi_common __fl_common;
159 struct flowi4 ip4;
160 struct flowi6 ip6;
161 } u;
162#define flowi_oif u.__fl_common.flowic_oif
163#define flowi_iif u.__fl_common.flowic_iif
164#define flowi_l3mdev u.__fl_common.flowic_l3mdev
165#define flowi_mark u.__fl_common.flowic_mark
166#define flowi_tos u.__fl_common.flowic_tos
167#define flowi_scope u.__fl_common.flowic_scope
168#define flowi_proto u.__fl_common.flowic_proto
169#define flowi_flags u.__fl_common.flowic_flags
170#define flowi_secid u.__fl_common.flowic_secid
171#define flowi_tun_key u.__fl_common.flowic_tun_key
172#define flowi_uid u.__fl_common.flowic_uid
173} __attribute__((__aligned__(BITS_PER_LONG/8)));
174
175static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
176{
177 return container_of(fl4, struct flowi, u.ip4);
178}
179
180static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
181{
182 return &(fl4->__fl_common);
183}
184
185static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
186{
187 return container_of(fl6, struct flowi, u.ip6);
188}
189
190static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
191{
192 return &(fl6->__fl_common);
193}
194
195__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
196
197#endif