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 	struct {
58 		__le16	dport;
59 		__le16	sport;
60 	} dnports;
61 
62 	__be32		spi;
63 	__be32		gre_key;
64 
65 	struct {
66 		__u8	type;
67 	} mht;
68 };
69 
70 struct flowi4 {
71 	struct flowi_common	__fl_common;
72 #define flowi4_oif		__fl_common.flowic_oif
73 #define flowi4_iif		__fl_common.flowic_iif
74 #define flowi4_mark		__fl_common.flowic_mark
75 #define flowi4_tos		__fl_common.flowic_tos
76 #define flowi4_scope		__fl_common.flowic_scope
77 #define flowi4_proto		__fl_common.flowic_proto
78 #define flowi4_flags		__fl_common.flowic_flags
79 #define flowi4_secid		__fl_common.flowic_secid
80 #define flowi4_tun_key		__fl_common.flowic_tun_key
81 #define flowi4_uid		__fl_common.flowic_uid
82 #define flowi4_multipath_hash	__fl_common.flowic_multipath_hash
83 
84 	/* (saddr,daddr) must be grouped, same order as in IP header */
85 	__be32			saddr;
86 	__be32			daddr;
87 
88 	union flowi_uli		uli;
89 #define fl4_sport		uli.ports.sport
90 #define fl4_dport		uli.ports.dport
91 #define fl4_icmp_type		uli.icmpt.type
92 #define fl4_icmp_code		uli.icmpt.code
93 #define fl4_ipsec_spi		uli.spi
94 #define fl4_mh_type		uli.mht.type
95 #define fl4_gre_key		uli.gre_key
96 } __attribute__((__aligned__(BITS_PER_LONG/8)));
97 
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)98 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
99 				      __u32 mark, __u8 tos, __u8 scope,
100 				      __u8 proto, __u8 flags,
101 				      __be32 daddr, __be32 saddr,
102 				      __be16 dport, __be16 sport,
103 				      kuid_t uid)
104 {
105 	fl4->flowi4_oif = oif;
106 	fl4->flowi4_iif = LOOPBACK_IFINDEX;
107 	fl4->flowi4_mark = mark;
108 	fl4->flowi4_tos = tos;
109 	fl4->flowi4_scope = scope;
110 	fl4->flowi4_proto = proto;
111 	fl4->flowi4_flags = flags;
112 	fl4->flowi4_secid = 0;
113 	fl4->flowi4_tun_key.tun_id = 0;
114 	fl4->flowi4_uid = uid;
115 	fl4->daddr = daddr;
116 	fl4->saddr = saddr;
117 	fl4->fl4_dport = dport;
118 	fl4->fl4_sport = sport;
119 }
120 
121 /* Reset some input parameters after previous lookup */
flowi4_update_output(struct flowi4 * fl4,int oif,__u8 tos,__be32 daddr,__be32 saddr)122 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
123 					__be32 daddr, __be32 saddr)
124 {
125 	fl4->flowi4_oif = oif;
126 	fl4->flowi4_tos = tos;
127 	fl4->daddr = daddr;
128 	fl4->saddr = saddr;
129 }
130 
131 
132 struct flowi6 {
133 	struct flowi_common	__fl_common;
134 #define flowi6_oif		__fl_common.flowic_oif
135 #define flowi6_iif		__fl_common.flowic_iif
136 #define flowi6_mark		__fl_common.flowic_mark
137 #define flowi6_scope		__fl_common.flowic_scope
138 #define flowi6_proto		__fl_common.flowic_proto
139 #define flowi6_flags		__fl_common.flowic_flags
140 #define flowi6_secid		__fl_common.flowic_secid
141 #define flowi6_tun_key		__fl_common.flowic_tun_key
142 #define flowi6_uid		__fl_common.flowic_uid
143 	struct in6_addr		daddr;
144 	struct in6_addr		saddr;
145 	/* Note: flowi6_tos is encoded in flowlabel, too. */
146 	__be32			flowlabel;
147 	union flowi_uli		uli;
148 #define fl6_sport		uli.ports.sport
149 #define fl6_dport		uli.ports.dport
150 #define fl6_icmp_type		uli.icmpt.type
151 #define fl6_icmp_code		uli.icmpt.code
152 #define fl6_ipsec_spi		uli.spi
153 #define fl6_mh_type		uli.mht.type
154 #define fl6_gre_key		uli.gre_key
155 	__u32			mp_hash;
156 } __attribute__((__aligned__(BITS_PER_LONG/8)));
157 
158 struct flowidn {
159 	struct flowi_common	__fl_common;
160 #define flowidn_oif		__fl_common.flowic_oif
161 #define flowidn_iif		__fl_common.flowic_iif
162 #define flowidn_mark		__fl_common.flowic_mark
163 #define flowidn_scope		__fl_common.flowic_scope
164 #define flowidn_proto		__fl_common.flowic_proto
165 #define flowidn_flags		__fl_common.flowic_flags
166 	__le16			daddr;
167 	__le16			saddr;
168 	union flowi_uli		uli;
169 #define fld_sport		uli.ports.sport
170 #define fld_dport		uli.ports.dport
171 } __attribute__((__aligned__(BITS_PER_LONG/8)));
172 
173 struct flowi {
174 	union {
175 		struct flowi_common	__fl_common;
176 		struct flowi4		ip4;
177 		struct flowi6		ip6;
178 		struct flowidn		dn;
179 	} u;
180 #define flowi_oif	u.__fl_common.flowic_oif
181 #define flowi_iif	u.__fl_common.flowic_iif
182 #define flowi_mark	u.__fl_common.flowic_mark
183 #define flowi_tos	u.__fl_common.flowic_tos
184 #define flowi_scope	u.__fl_common.flowic_scope
185 #define flowi_proto	u.__fl_common.flowic_proto
186 #define flowi_flags	u.__fl_common.flowic_flags
187 #define flowi_secid	u.__fl_common.flowic_secid
188 #define flowi_tun_key	u.__fl_common.flowic_tun_key
189 #define flowi_uid	u.__fl_common.flowic_uid
190 } __attribute__((__aligned__(BITS_PER_LONG/8)));
191 
flowi4_to_flowi(struct flowi4 * fl4)192 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
193 {
194 	return container_of(fl4, struct flowi, u.ip4);
195 }
196 
flowi6_to_flowi(struct flowi6 * fl6)197 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
198 {
199 	return container_of(fl6, struct flowi, u.ip6);
200 }
201 
flowidn_to_flowi(struct flowidn * fldn)202 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
203 {
204 	return container_of(fldn, struct flowi, u.dn);
205 }
206 
207 typedef unsigned long flow_compare_t;
208 
flow_key_size(u16 family)209 static inline unsigned int flow_key_size(u16 family)
210 {
211 	switch (family) {
212 	case AF_INET:
213 		BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
214 		return sizeof(struct flowi4) / sizeof(flow_compare_t);
215 	case AF_INET6:
216 		BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
217 		return sizeof(struct flowi6) / sizeof(flow_compare_t);
218 	case AF_DECnet:
219 		BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
220 		return sizeof(struct flowidn) / sizeof(flow_compare_t);
221 	}
222 	return 0;
223 }
224 
225 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
226 
227 #endif
228