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 struct flowi_tunnel flowic_tun_key;
42 kuid_t flowic_uid;
43 };
44
45 union 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
69 struct 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
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)96 static 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 */
flowi4_update_output(struct flowi4 * fl4,int oif,__u8 tos,__be32 daddr,__be32 saddr)120 static 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
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_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
156 struct 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
171 struct 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
flowi4_to_flowi(struct flowi4 * fl4)190 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
191 {
192 return container_of(fl4, struct flowi, u.ip4);
193 }
194
flowi6_to_flowi(struct flowi6 * fl6)195 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
196 {
197 return container_of(fl6, struct flowi, u.ip6);
198 }
199
flowidn_to_flowi(struct flowidn * fldn)200 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
201 {
202 return container_of(fldn, struct flowi, u.dn);
203 }
204
205 typedef unsigned long flow_compare_t;
206
flow_key_size(u16 family)207 static 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