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
16 struct 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
26 struct flowi_tunnel {
27 __be64 tun_id;
28 };
29
30 struct 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 __u32 flowic_secid;
42 kuid_t flowic_uid;
43 __u32 flowic_multipath_hash;
44 struct flowi_tunnel flowic_tun_key;
45 };
46
47 union flowi_uli {
48 struct {
49 __be16 dport;
50 __be16 sport;
51 } ports;
52
53 struct {
54 __u8 type;
55 __u8 code;
56 } icmpt;
57
58 __be32 gre_key;
59
60 struct {
61 __u8 type;
62 } mht;
63 };
64
65 struct flowi4 {
66 struct flowi_common __fl_common;
67 #define flowi4_oif __fl_common.flowic_oif
68 #define flowi4_iif __fl_common.flowic_iif
69 #define flowi4_l3mdev __fl_common.flowic_l3mdev
70 #define flowi4_mark __fl_common.flowic_mark
71 #define flowi4_tos __fl_common.flowic_tos
72 #define flowi4_scope __fl_common.flowic_scope
73 #define flowi4_proto __fl_common.flowic_proto
74 #define flowi4_flags __fl_common.flowic_flags
75 #define flowi4_secid __fl_common.flowic_secid
76 #define flowi4_tun_key __fl_common.flowic_tun_key
77 #define flowi4_uid __fl_common.flowic_uid
78 #define flowi4_multipath_hash __fl_common.flowic_multipath_hash
79
80 /* (saddr,daddr) must be grouped, same order as in IP header */
81 __be32 saddr;
82 __be32 daddr;
83
84 union flowi_uli uli;
85 #define fl4_sport uli.ports.sport
86 #define fl4_dport uli.ports.dport
87 #define fl4_icmp_type uli.icmpt.type
88 #define fl4_icmp_code uli.icmpt.code
89 #define fl4_mh_type uli.mht.type
90 #define fl4_gre_key uli.gre_key
91 } __attribute__((__aligned__(BITS_PER_LONG/8)));
92
93 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
94 __u32 mark, __u8 tos, __u8 scope,
95 __u8 proto, __u8 flags,
96 __be32 daddr, __be32 saddr,
97 __be16 dport, __be16 sport,
98 kuid_t uid)
99 {
100 fl4->flowi4_oif = oif;
101 fl4->flowi4_iif = LOOPBACK_IFINDEX;
102 fl4->flowi4_l3mdev = 0;
103 fl4->flowi4_mark = mark;
104 fl4->flowi4_tos = tos;
105 fl4->flowi4_scope = scope;
106 fl4->flowi4_proto = proto;
107 fl4->flowi4_flags = flags;
108 fl4->flowi4_secid = 0;
109 fl4->flowi4_tun_key.tun_id = 0;
110 fl4->flowi4_uid = uid;
111 fl4->daddr = daddr;
112 fl4->saddr = saddr;
113 fl4->fl4_dport = dport;
114 fl4->fl4_sport = sport;
115 fl4->flowi4_multipath_hash = 0;
116 }
117
118 /* Reset some input parameters after previous lookup */
119 static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
120 __be32 daddr, __be32 saddr)
121 {
122 fl4->flowi4_oif = oif;
123 fl4->daddr = daddr;
124 fl4->saddr = saddr;
125 }
126
127
128 struct 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
154 struct 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
173 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
174 {
175 return container_of(fl4, struct flowi, u.ip4);
176 }
177
178 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
179 {
180 return &(fl4->__fl_common);
181 }
182
183 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
184 {
185 return container_of(fl6, struct flowi, u.ip6);
186 }
187
188 static 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
196
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