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 __u32 flowic_mark;
33 __u8 flowic_tos;
34 __u8 flowic_scope;
35 __u8 flowic_proto;
36 __u8 flowic_flags;
37#define FLOWI_FLAG_ANYSRC 0x01
38#define FLOWI_FLAG_KNOWN_NH 0x02
39#define FLOWI_FLAG_SKIP_NH_OIF 0x04
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 spi;
63 __be32 gre_key;
64
65 struct {
66 __u8 type;
67 } mht;
68};
69
70struct flowi4 {
71 struct flowi_common __fl_common;
72#define flowi4_oif __fl_common.flowic_oif
73#define flowi4_iif __fl_common.flowic_iif
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_ipsec_spi uli.spi
94#define fl4_mh_type uli.mht.type
95#define fl4_gre_key uli.gre_key
96} __attribute__((__aligned__(BITS_PER_LONG/8)));
97
98static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
99 __u32 mark, __u8 tos, __u8 scope,
100 __u8 proto, __u8 flags,
101 __be32 daddr, __be32 saddr,
102 __be16 dport, __be16 sport,
103 kuid_t uid)
104{
105 fl4->flowi4_oif = oif;
106 fl4->flowi4_iif = LOOPBACK_IFINDEX;
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}
120
121/* Reset some input parameters after previous lookup */
122static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
123 __be32 daddr, __be32 saddr)
124{
125 fl4->flowi4_oif = oif;
126 fl4->flowi4_tos = tos;
127 fl4->daddr = daddr;
128 fl4->saddr = saddr;
129}
130
131
132struct flowi6 {
133 struct flowi_common __fl_common;
134#define flowi6_oif __fl_common.flowic_oif
135#define flowi6_iif __fl_common.flowic_iif
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_tos 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_ipsec_spi uli.spi
153#define fl6_mh_type uli.mht.type
154#define fl6_gre_key uli.gre_key
155 __u32 mp_hash;
156} __attribute__((__aligned__(BITS_PER_LONG/8)));
157
158struct flowidn {
159 struct flowi_common __fl_common;
160#define flowidn_oif __fl_common.flowic_oif
161#define flowidn_iif __fl_common.flowic_iif
162#define flowidn_mark __fl_common.flowic_mark
163#define flowidn_scope __fl_common.flowic_scope
164#define flowidn_proto __fl_common.flowic_proto
165#define flowidn_flags __fl_common.flowic_flags
166 __le16 daddr;
167 __le16 saddr;
168 union flowi_uli uli;
169#define fld_sport uli.ports.sport
170#define fld_dport uli.ports.dport
171} __attribute__((__aligned__(BITS_PER_LONG/8)));
172
173struct flowi {
174 union {
175 struct flowi_common __fl_common;
176 struct flowi4 ip4;
177 struct flowi6 ip6;
178 struct flowidn dn;
179 } u;
180#define flowi_oif u.__fl_common.flowic_oif
181#define flowi_iif u.__fl_common.flowic_iif
182#define flowi_mark u.__fl_common.flowic_mark
183#define flowi_tos u.__fl_common.flowic_tos
184#define flowi_scope u.__fl_common.flowic_scope
185#define flowi_proto u.__fl_common.flowic_proto
186#define flowi_flags u.__fl_common.flowic_flags
187#define flowi_secid u.__fl_common.flowic_secid
188#define flowi_tun_key u.__fl_common.flowic_tun_key
189#define flowi_uid u.__fl_common.flowic_uid
190} __attribute__((__aligned__(BITS_PER_LONG/8)));
191
192static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
193{
194 return container_of(fl4, struct flowi, u.ip4);
195}
196
197static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
198{
199 return container_of(fl6, struct flowi, u.ip6);
200}
201
202static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
203{
204 return container_of(fldn, struct flowi, u.dn);
205}
206
207typedef unsigned long flow_compare_t;
208
209static inline unsigned int flow_key_size(u16 family)
210{
211 switch (family) {
212 case AF_INET:
213 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
214 return sizeof(struct flowi4) / sizeof(flow_compare_t);
215 case AF_INET6:
216 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
217 return sizeof(struct flowi6) / sizeof(flow_compare_t);
218 case AF_DECnet:
219 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
220 return sizeof(struct flowidn) / sizeof(flow_compare_t);
221 }
222 return 0;
223}
224
225__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
226
227#endif
228