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
25 struct flowi_tunnel {
26 __be64 tun_id;
27 };
28
29 struct 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
46 union 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 __be32 spi;
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_mark __fl_common.flowic_mark
70 #define flowi4_tos __fl_common.flowic_tos
71 #define flowi4_scope __fl_common.flowic_scope
72 #define flowi4_proto __fl_common.flowic_proto
73 #define flowi4_flags __fl_common.flowic_flags
74 #define flowi4_secid __fl_common.flowic_secid
75 #define flowi4_tun_key __fl_common.flowic_tun_key
76 #define flowi4_uid __fl_common.flowic_uid
77 #define flowi4_multipath_hash __fl_common.flowic_multipath_hash
78
79 /* (saddr,daddr) must be grouped, same order as in IP header */
80 __be32 saddr;
81 __be32 daddr;
82
83 union flowi_uli uli;
84 #define fl4_sport uli.ports.sport
85 #define fl4_dport uli.ports.dport
86 #define fl4_icmp_type uli.icmpt.type
87 #define fl4_icmp_code uli.icmpt.code
88 #define fl4_ipsec_spi uli.spi
89 #define fl4_mh_type uli.mht.type
90 #define fl4_gre_key uli.gre_key
91 } __attribute__((__aligned__(BITS_PER_LONG/8)));
92
flowi4_init_output(struct flowi4 * fl4,int oif,__u32 mark,__u8 tos,__u8 scope,__u8 proto,__u8 flags,__be32 daddr,__be32 saddr,__be16 dport,__be16 sport,kuid_t uid)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_mark = mark;
103 fl4->flowi4_tos = tos;
104 fl4->flowi4_scope = scope;
105 fl4->flowi4_proto = proto;
106 fl4->flowi4_flags = flags;
107 fl4->flowi4_secid = 0;
108 fl4->flowi4_tun_key.tun_id = 0;
109 fl4->flowi4_uid = uid;
110 fl4->daddr = daddr;
111 fl4->saddr = saddr;
112 fl4->fl4_dport = dport;
113 fl4->fl4_sport = sport;
114 fl4->flowi4_multipath_hash = 0;
115 }
116
117 /* Reset some input parameters after previous lookup */
flowi4_update_output(struct flowi4 * fl4,int oif,__u8 tos,__be32 daddr,__be32 saddr)118 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
119 __be32 daddr, __be32 saddr)
120 {
121 fl4->flowi4_oif = oif;
122 fl4->flowi4_tos = tos;
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_mark __fl_common.flowic_mark
133 #define flowi6_scope __fl_common.flowic_scope
134 #define flowi6_proto __fl_common.flowic_proto
135 #define flowi6_flags __fl_common.flowic_flags
136 #define flowi6_secid __fl_common.flowic_secid
137 #define flowi6_tun_key __fl_common.flowic_tun_key
138 #define flowi6_uid __fl_common.flowic_uid
139 struct in6_addr daddr;
140 struct in6_addr saddr;
141 /* Note: flowi6_tos is encoded in flowlabel, too. */
142 __be32 flowlabel;
143 union flowi_uli uli;
144 #define fl6_sport uli.ports.sport
145 #define fl6_dport uli.ports.dport
146 #define fl6_icmp_type uli.icmpt.type
147 #define fl6_icmp_code uli.icmpt.code
148 #define fl6_ipsec_spi uli.spi
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_mark u.__fl_common.flowic_mark
163 #define flowi_tos u.__fl_common.flowic_tos
164 #define flowi_scope u.__fl_common.flowic_scope
165 #define flowi_proto u.__fl_common.flowic_proto
166 #define flowi_flags u.__fl_common.flowic_flags
167 #define flowi_secid u.__fl_common.flowic_secid
168 #define flowi_tun_key u.__fl_common.flowic_tun_key
169 #define flowi_uid u.__fl_common.flowic_uid
170 } __attribute__((__aligned__(BITS_PER_LONG/8)));
171
flowi4_to_flowi(struct flowi4 * fl4)172 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
173 {
174 return container_of(fl4, struct flowi, u.ip4);
175 }
176
flowi4_to_flowi_common(struct flowi4 * fl4)177 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
178 {
179 return &(flowi4_to_flowi(fl4)->u.__fl_common);
180 }
181
flowi6_to_flowi(struct flowi6 * fl6)182 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
183 {
184 return container_of(fl6, struct flowi, u.ip6);
185 }
186
flowi6_to_flowi_common(struct flowi6 * fl6)187 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
188 {
189 return &(flowi6_to_flowi(fl6)->u.__fl_common);
190 }
191
192 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
193
194 #endif
195