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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#include <net/inet_dscp.h>
16
17struct flow_keys;
18
19/*
20 * ifindex generation is per-net namespace, and loopback is
21 * always the 1st device in ns (see net_dev_init), thus any
22 * loopback device should get ifindex 1
23 */
24
25#define LOOPBACK_IFINDEX 1
26
27struct flowi_tunnel {
28 __be64 tun_id;
29};
30
31struct flowi_common {
32 int flowic_oif;
33 int flowic_iif;
34 int flowic_l3mdev;
35 __u32 flowic_mark;
36 dscp_t flowic_dscp;
37 __u8 flowic_scope;
38 __u8 flowic_proto;
39 __u8 flowic_flags;
40#define FLOWI_FLAG_ANYSRC 0x01
41#define FLOWI_FLAG_KNOWN_NH 0x02
42#define FLOWI_FLAG_L3MDEV_OIF 0x04
43#define FLOWI_FLAG_ANY_SPORT 0x08
44 __u32 flowic_secid;
45 kuid_t flowic_uid;
46 __u32 flowic_multipath_hash;
47 struct flowi_tunnel flowic_tun_key;
48};
49
50union flowi_uli {
51 struct {
52 __be16 dport;
53 __be16 sport;
54 } ports;
55
56 struct {
57 __u8 type;
58 __u8 code;
59 } icmpt;
60
61 __be32 gre_key;
62
63 struct {
64 __u8 type;
65 } mht;
66};
67
68struct flowi4 {
69 struct flowi_common __fl_common;
70#define flowi4_oif __fl_common.flowic_oif
71#define flowi4_iif __fl_common.flowic_iif
72#define flowi4_l3mdev __fl_common.flowic_l3mdev
73#define flowi4_mark __fl_common.flowic_mark
74#define flowi4_dscp __fl_common.flowic_dscp
75#define flowi4_scope __fl_common.flowic_scope
76#define flowi4_proto __fl_common.flowic_proto
77#define flowi4_flags __fl_common.flowic_flags
78#define flowi4_secid __fl_common.flowic_secid
79#define flowi4_tun_key __fl_common.flowic_tun_key
80#define flowi4_uid __fl_common.flowic_uid
81#define flowi4_multipath_hash __fl_common.flowic_multipath_hash
82
83 /* (saddr,daddr) must be grouped, same order as in IP header */
84 __be32 saddr;
85 __be32 daddr;
86
87 union flowi_uli uli;
88#define fl4_sport uli.ports.sport
89#define fl4_dport uli.ports.dport
90#define fl4_icmp_type uli.icmpt.type
91#define fl4_icmp_code uli.icmpt.code
92#define fl4_mh_type uli.mht.type
93#define fl4_gre_key uli.gre_key
94} __attribute__((__aligned__(BITS_PER_LONG/8)));
95
96static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
97 __u32 mark, __u8 tos, __u8 scope,
98 __u8 proto, __u8 flags,
99 __be32 daddr, __be32 saddr,
100 __be16 dport, __be16 sport,
101 kuid_t uid)
102{
103 fl4->flowi4_oif = oif;
104 fl4->flowi4_iif = LOOPBACK_IFINDEX;
105 fl4->flowi4_l3mdev = 0;
106 fl4->flowi4_mark = mark;
107 fl4->flowi4_dscp = inet_dsfield_to_dscp(tos);
108 fl4->flowi4_scope = scope;
109 fl4->flowi4_proto = proto;
110 fl4->flowi4_flags = flags;
111 fl4->flowi4_secid = 0;
112 fl4->flowi4_tun_key.tun_id = 0;
113 fl4->flowi4_uid = uid;
114 fl4->daddr = daddr;
115 fl4->saddr = saddr;
116 fl4->fl4_dport = dport;
117 fl4->fl4_sport = sport;
118 fl4->flowi4_multipath_hash = 0;
119}
120
121/* Reset some input parameters after previous lookup */
122static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
123 __be32 daddr, __be32 saddr)
124{
125 fl4->flowi4_oif = oif;
126 fl4->daddr = daddr;
127 fl4->saddr = saddr;
128}
129
130
131struct flowi6 {
132 struct flowi_common __fl_common;
133#define flowi6_oif __fl_common.flowic_oif
134#define flowi6_iif __fl_common.flowic_iif
135#define flowi6_l3mdev __fl_common.flowic_l3mdev
136#define flowi6_mark __fl_common.flowic_mark
137#define flowi6_scope __fl_common.flowic_scope
138#define flowi6_proto __fl_common.flowic_proto
139#define flowi6_flags __fl_common.flowic_flags
140#define flowi6_secid __fl_common.flowic_secid
141#define flowi6_tun_key __fl_common.flowic_tun_key
142#define flowi6_uid __fl_common.flowic_uid
143 struct in6_addr daddr;
144 struct in6_addr saddr;
145 /* Note: flowi6_dscp is encoded in flowlabel, too. */
146 __be32 flowlabel;
147 union flowi_uli uli;
148#define fl6_sport uli.ports.sport
149#define fl6_dport uli.ports.dport
150#define fl6_icmp_type uli.icmpt.type
151#define fl6_icmp_code uli.icmpt.code
152#define fl6_mh_type uli.mht.type
153#define fl6_gre_key uli.gre_key
154 __u32 mp_hash;
155} __attribute__((__aligned__(BITS_PER_LONG/8)));
156
157struct flowi {
158 union {
159 struct flowi_common __fl_common;
160 struct flowi4 ip4;
161 struct flowi6 ip6;
162 } u;
163#define flowi_oif u.__fl_common.flowic_oif
164#define flowi_iif u.__fl_common.flowic_iif
165#define flowi_l3mdev u.__fl_common.flowic_l3mdev
166#define flowi_mark u.__fl_common.flowic_mark
167#define flowi_dscp u.__fl_common.flowic_dscp
168#define flowi_scope u.__fl_common.flowic_scope
169#define flowi_proto u.__fl_common.flowic_proto
170#define flowi_flags u.__fl_common.flowic_flags
171#define flowi_secid u.__fl_common.flowic_secid
172#define flowi_tun_key u.__fl_common.flowic_tun_key
173#define flowi_uid u.__fl_common.flowic_uid
174} __attribute__((__aligned__(BITS_PER_LONG/8)));
175
176static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
177{
178 return container_of(fl4, struct flowi, u.ip4);
179}
180
181static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
182{
183 return &(fl4->__fl_common);
184}
185
186static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
187{
188 return container_of(fl6, struct flowi, u.ip6);
189}
190
191static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
192{
193 return &(fl6->__fl_common);
194}
195
196__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
197
198#endif