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 #define FLOWI_FLAG_L3MDEV_OIF 0x04
42 #define FLOWI_FLAG_ANY_SPORT 0x08
43 __u32 flowic_secid;
44 kuid_t flowic_uid;
45 __u32 flowic_multipath_hash;
46 struct flowi_tunnel flowic_tun_key;
47 };
48
49 union flowi_uli {
50 struct {
51 __be16 dport;
52 __be16 sport;
53 } ports;
54
55 struct {
56 __u8 type;
57 __u8 code;
58 } icmpt;
59
60 __be32 gre_key;
61
62 struct {
63 __u8 type;
64 } mht;
65 };
66
67 struct flowi4 {
68 struct flowi_common __fl_common;
69 #define flowi4_oif __fl_common.flowic_oif
70 #define flowi4_iif __fl_common.flowic_iif
71 #define flowi4_l3mdev __fl_common.flowic_l3mdev
72 #define flowi4_mark __fl_common.flowic_mark
73 #define flowi4_tos __fl_common.flowic_tos
74 #define flowi4_scope __fl_common.flowic_scope
75 #define flowi4_proto __fl_common.flowic_proto
76 #define flowi4_flags __fl_common.flowic_flags
77 #define flowi4_secid __fl_common.flowic_secid
78 #define flowi4_tun_key __fl_common.flowic_tun_key
79 #define flowi4_uid __fl_common.flowic_uid
80 #define flowi4_multipath_hash __fl_common.flowic_multipath_hash
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_mh_type uli.mht.type
92 #define fl4_gre_key uli.gre_key
93 } __attribute__((__aligned__(BITS_PER_LONG/8)));
94
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)95 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
96 __u32 mark, __u8 tos, __u8 scope,
97 __u8 proto, __u8 flags,
98 __be32 daddr, __be32 saddr,
99 __be16 dport, __be16 sport,
100 kuid_t uid)
101 {
102 fl4->flowi4_oif = oif;
103 fl4->flowi4_iif = LOOPBACK_IFINDEX;
104 fl4->flowi4_l3mdev = 0;
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 fl4->flowi4_multipath_hash = 0;
118 }
119
120 /* Reset some input parameters after previous lookup */
flowi4_update_output(struct flowi4 * fl4,int oif,__be32 daddr,__be32 saddr)121 static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
122 __be32 daddr, __be32 saddr)
123 {
124 fl4->flowi4_oif = oif;
125 fl4->daddr = daddr;
126 fl4->saddr = saddr;
127 }
128
129
130 struct 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_l3mdev __fl_common.flowic_l3mdev
135 #define flowi6_mark __fl_common.flowic_mark
136 #define flowi6_scope __fl_common.flowic_scope
137 #define flowi6_proto __fl_common.flowic_proto
138 #define flowi6_flags __fl_common.flowic_flags
139 #define flowi6_secid __fl_common.flowic_secid
140 #define flowi6_tun_key __fl_common.flowic_tun_key
141 #define flowi6_uid __fl_common.flowic_uid
142 struct in6_addr daddr;
143 struct in6_addr saddr;
144 /* Note: flowi6_tos is encoded in flowlabel, too. */
145 __be32 flowlabel;
146 union flowi_uli uli;
147 #define fl6_sport uli.ports.sport
148 #define fl6_dport uli.ports.dport
149 #define fl6_icmp_type uli.icmpt.type
150 #define fl6_icmp_code uli.icmpt.code
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
156 struct flowi {
157 union {
158 struct flowi_common __fl_common;
159 struct flowi4 ip4;
160 struct flowi6 ip6;
161 } u;
162 #define flowi_oif u.__fl_common.flowic_oif
163 #define flowi_iif u.__fl_common.flowic_iif
164 #define flowi_l3mdev u.__fl_common.flowic_l3mdev
165 #define flowi_mark u.__fl_common.flowic_mark
166 #define flowi_tos u.__fl_common.flowic_tos
167 #define flowi_scope u.__fl_common.flowic_scope
168 #define flowi_proto u.__fl_common.flowic_proto
169 #define flowi_flags u.__fl_common.flowic_flags
170 #define flowi_secid u.__fl_common.flowic_secid
171 #define flowi_tun_key u.__fl_common.flowic_tun_key
172 #define flowi_uid u.__fl_common.flowic_uid
173 } __attribute__((__aligned__(BITS_PER_LONG/8)));
174
flowi4_to_flowi(struct flowi4 * fl4)175 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
176 {
177 return container_of(fl4, struct flowi, u.ip4);
178 }
179
flowi4_to_flowi_common(struct flowi4 * fl4)180 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
181 {
182 return &(fl4->__fl_common);
183 }
184
flowi6_to_flowi(struct flowi6 * fl6)185 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
186 {
187 return container_of(fl6, struct flowi, u.ip6);
188 }
189
flowi6_to_flowi_common(struct flowi6 * fl6)190 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
191 {
192 return &(fl6->__fl_common);
193 }
194
195 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
196
197 #endif
198