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 struct flowi_tunnel flowic_tun_key;
42 kuid_t flowic_uid;
43};
44
45union flowi_uli {
46 struct {
47 __be16 dport;
48 __be16 sport;
49 } ports;
50
51 struct {
52 __u8 type;
53 __u8 code;
54 } icmpt;
55
56 struct {
57 __le16 dport;
58 __le16 sport;
59 } dnports;
60
61 __be32 spi;
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_mark __fl_common.flowic_mark
74#define flowi4_tos __fl_common.flowic_tos
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
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_ipsec_spi uli.spi
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_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}
118
119/* Reset some input parameters after previous lookup */
120static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
121 __be32 daddr, __be32 saddr)
122{
123 fl4->flowi4_oif = oif;
124 fl4->flowi4_tos = tos;
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_mark __fl_common.flowic_mark
135#define flowi6_scope __fl_common.flowic_scope
136#define flowi6_proto __fl_common.flowic_proto
137#define flowi6_flags __fl_common.flowic_flags
138#define flowi6_secid __fl_common.flowic_secid
139#define flowi6_tun_key __fl_common.flowic_tun_key
140#define flowi6_uid __fl_common.flowic_uid
141 struct in6_addr daddr;
142 struct in6_addr saddr;
143 /* Note: flowi6_tos is encoded in flowlabel, too. */
144 __be32 flowlabel;
145 union flowi_uli uli;
146#define fl6_sport uli.ports.sport
147#define fl6_dport uli.ports.dport
148#define fl6_icmp_type uli.icmpt.type
149#define fl6_icmp_code uli.icmpt.code
150#define fl6_ipsec_spi uli.spi
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 flowidn {
157 struct flowi_common __fl_common;
158#define flowidn_oif __fl_common.flowic_oif
159#define flowidn_iif __fl_common.flowic_iif
160#define flowidn_mark __fl_common.flowic_mark
161#define flowidn_scope __fl_common.flowic_scope
162#define flowidn_proto __fl_common.flowic_proto
163#define flowidn_flags __fl_common.flowic_flags
164 __le16 daddr;
165 __le16 saddr;
166 union flowi_uli uli;
167#define fld_sport uli.ports.sport
168#define fld_dport uli.ports.dport
169} __attribute__((__aligned__(BITS_PER_LONG/8)));
170
171struct flowi {
172 union {
173 struct flowi_common __fl_common;
174 struct flowi4 ip4;
175 struct flowi6 ip6;
176 struct flowidn dn;
177 } u;
178#define flowi_oif u.__fl_common.flowic_oif
179#define flowi_iif u.__fl_common.flowic_iif
180#define flowi_mark u.__fl_common.flowic_mark
181#define flowi_tos u.__fl_common.flowic_tos
182#define flowi_scope u.__fl_common.flowic_scope
183#define flowi_proto u.__fl_common.flowic_proto
184#define flowi_flags u.__fl_common.flowic_flags
185#define flowi_secid u.__fl_common.flowic_secid
186#define flowi_tun_key u.__fl_common.flowic_tun_key
187#define flowi_uid u.__fl_common.flowic_uid
188} __attribute__((__aligned__(BITS_PER_LONG/8)));
189
190static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
191{
192 return container_of(fl4, struct flowi, u.ip4);
193}
194
195static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
196{
197 return container_of(fl6, struct flowi, u.ip6);
198}
199
200static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
201{
202 return container_of(fldn, struct flowi, u.dn);
203}
204
205typedef unsigned long flow_compare_t;
206
207static inline unsigned int flow_key_size(u16 family)
208{
209 switch (family) {
210 case AF_INET:
211 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
212 return sizeof(struct flowi4) / sizeof(flow_compare_t);
213 case AF_INET6:
214 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
215 return sizeof(struct flowi6) / sizeof(flow_compare_t);
216 case AF_DECnet:
217 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
218 return sizeof(struct flowidn) / sizeof(flow_compare_t);
219 }
220 return 0;
221}
222
223__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
224
225#endif
226