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 	struct flowi_tunnel flowic_tun_key;
44 	__u32		flowic_multipath_hash;
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 
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_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 */
flowi4_update_output(struct flowi4 * fl4,int oif,__u8 tos,__be32 daddr,__be32 saddr)119 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
120 					__be32 daddr, __be32 saddr)
121 {
122 	fl4->flowi4_oif = oif;
123 	fl4->flowi4_tos = tos;
124 	fl4->daddr = daddr;
125 	fl4->saddr = saddr;
126 }
127 
128 
129 struct flowi6 {
130 	struct flowi_common	__fl_common;
131 #define flowi6_oif		__fl_common.flowic_oif
132 #define flowi6_iif		__fl_common.flowic_iif
133 #define flowi6_l3mdev		__fl_common.flowic_l3mdev
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_mh_type		uli.mht.type
151 #define fl6_gre_key		uli.gre_key
152 	__u32			mp_hash;
153 } __attribute__((__aligned__(BITS_PER_LONG/8)));
154 
155 struct flowi {
156 	union {
157 		struct flowi_common	__fl_common;
158 		struct flowi4		ip4;
159 		struct flowi6		ip6;
160 	} u;
161 #define flowi_oif	u.__fl_common.flowic_oif
162 #define flowi_iif	u.__fl_common.flowic_iif
163 #define flowi_l3mdev	u.__fl_common.flowic_l3mdev
164 #define flowi_mark	u.__fl_common.flowic_mark
165 #define flowi_tos	u.__fl_common.flowic_tos
166 #define flowi_scope	u.__fl_common.flowic_scope
167 #define flowi_proto	u.__fl_common.flowic_proto
168 #define flowi_flags	u.__fl_common.flowic_flags
169 #define flowi_secid	u.__fl_common.flowic_secid
170 #define flowi_tun_key	u.__fl_common.flowic_tun_key
171 #define flowi_uid	u.__fl_common.flowic_uid
172 } __attribute__((__aligned__(BITS_PER_LONG/8)));
173 
flowi4_to_flowi(struct flowi4 * fl4)174 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
175 {
176 	return container_of(fl4, struct flowi, u.ip4);
177 }
178 
flowi4_to_flowi_common(struct flowi4 * fl4)179 static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
180 {
181 	return &(fl4->__fl_common);
182 }
183 
flowi6_to_flowi(struct flowi6 * fl6)184 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
185 {
186 	return container_of(fl6, struct flowi, u.ip6);
187 }
188 
flowi6_to_flowi_common(struct flowi6 * fl6)189 static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
190 {
191 	return &(fl6->__fl_common);
192 }
193 
194 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
195 
196 #endif
197