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1 /*
2  *
3  *	Generic internet FLOW.
4  *
5  */
6 
7 #ifndef _NET_FLOW_H
8 #define _NET_FLOW_H
9 
10 #include <linux/socket.h>
11 #include <linux/in6.h>
12 #include <linux/atomic.h>
13 
14 struct flowi_common {
15 	int	flowic_oif;
16 	int	flowic_iif;
17 	__u32	flowic_mark;
18 	__u8	flowic_tos;
19 	__u8	flowic_scope;
20 	__u8	flowic_proto;
21 	__u8	flowic_flags;
22 #define FLOWI_FLAG_ANYSRC		0x01
23 #define FLOWI_FLAG_PRECOW_METRICS	0x02
24 #define FLOWI_FLAG_CAN_SLEEP		0x04
25 	__u32	flowic_secid;
26 	uid_t	flowic_uid;
27 };
28 
29 union flowi_uli {
30 	struct {
31 		__be16	dport;
32 		__be16	sport;
33 	} ports;
34 
35 	struct {
36 		__u8	type;
37 		__u8	code;
38 	} icmpt;
39 
40 	struct {
41 		__le16	dport;
42 		__le16	sport;
43 	} dnports;
44 
45 	__be32		spi;
46 	__be32		gre_key;
47 
48 	struct {
49 		__u8	type;
50 	} mht;
51 };
52 
53 struct flowi4 {
54 	struct flowi_common	__fl_common;
55 #define flowi4_oif		__fl_common.flowic_oif
56 #define flowi4_iif		__fl_common.flowic_iif
57 #define flowi4_mark		__fl_common.flowic_mark
58 #define flowi4_tos		__fl_common.flowic_tos
59 #define flowi4_scope		__fl_common.flowic_scope
60 #define flowi4_proto		__fl_common.flowic_proto
61 #define flowi4_flags		__fl_common.flowic_flags
62 #define flowi4_secid		__fl_common.flowic_secid
63 #define flowi4_uid		__fl_common.flowic_uid
64 
65 	/* (saddr,daddr) must be grouped, same order as in IP header */
66 	__be32			saddr;
67 	__be32			daddr;
68 
69 	union flowi_uli		uli;
70 #define fl4_sport		uli.ports.sport
71 #define fl4_dport		uli.ports.dport
72 #define fl4_icmp_type		uli.icmpt.type
73 #define fl4_icmp_code		uli.icmpt.code
74 #define fl4_ipsec_spi		uli.spi
75 #define fl4_mh_type		uli.mht.type
76 #define fl4_gre_key		uli.gre_key
77 } __attribute__((__aligned__(BITS_PER_LONG/8)));
78 
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,uid_t uid)79 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
80 				      __u32 mark, __u8 tos, __u8 scope,
81 				      __u8 proto, __u8 flags,
82 				      __be32 daddr, __be32 saddr,
83 				      __be16 dport, __be16 sport,
84 				      uid_t uid)
85 {
86 	fl4->flowi4_oif = oif;
87 	fl4->flowi4_iif = 0;
88 	fl4->flowi4_mark = mark;
89 	fl4->flowi4_tos = tos;
90 	fl4->flowi4_scope = scope;
91 	fl4->flowi4_proto = proto;
92 	fl4->flowi4_flags = flags;
93 	fl4->flowi4_secid = 0;
94 	fl4->flowi4_uid = uid;
95 	fl4->daddr = daddr;
96 	fl4->saddr = saddr;
97 	fl4->fl4_dport = dport;
98 	fl4->fl4_sport = sport;
99 }
100 
101 /* Reset some input parameters after previous lookup */
flowi4_update_output(struct flowi4 * fl4,int oif,__u8 tos,__be32 daddr,__be32 saddr)102 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
103 					__be32 daddr, __be32 saddr)
104 {
105 	fl4->flowi4_oif = oif;
106 	fl4->flowi4_tos = tos;
107 	fl4->daddr = daddr;
108 	fl4->saddr = saddr;
109 }
110 
111 
112 struct flowi6 {
113 	struct flowi_common	__fl_common;
114 #define flowi6_oif		__fl_common.flowic_oif
115 #define flowi6_iif		__fl_common.flowic_iif
116 #define flowi6_mark		__fl_common.flowic_mark
117 #define flowi6_tos		__fl_common.flowic_tos
118 #define flowi6_scope		__fl_common.flowic_scope
119 #define flowi6_proto		__fl_common.flowic_proto
120 #define flowi6_flags		__fl_common.flowic_flags
121 #define flowi6_secid		__fl_common.flowic_secid
122 #define flowi6_uid		__fl_common.flowic_uid
123 	struct in6_addr		daddr;
124 	struct in6_addr		saddr;
125 	__be32			flowlabel;
126 	union flowi_uli		uli;
127 #define fl6_sport		uli.ports.sport
128 #define fl6_dport		uli.ports.dport
129 #define fl6_icmp_type		uli.icmpt.type
130 #define fl6_icmp_code		uli.icmpt.code
131 #define fl6_ipsec_spi		uli.spi
132 #define fl6_mh_type		uli.mht.type
133 #define fl6_gre_key		uli.gre_key
134 } __attribute__((__aligned__(BITS_PER_LONG/8)));
135 
136 struct flowidn {
137 	struct flowi_common	__fl_common;
138 #define flowidn_oif		__fl_common.flowic_oif
139 #define flowidn_iif		__fl_common.flowic_iif
140 #define flowidn_mark		__fl_common.flowic_mark
141 #define flowidn_scope		__fl_common.flowic_scope
142 #define flowidn_proto		__fl_common.flowic_proto
143 #define flowidn_flags		__fl_common.flowic_flags
144 	__le16			daddr;
145 	__le16			saddr;
146 	union flowi_uli		uli;
147 #define fld_sport		uli.ports.sport
148 #define fld_dport		uli.ports.dport
149 } __attribute__((__aligned__(BITS_PER_LONG/8)));
150 
151 struct flowi {
152 	union {
153 		struct flowi_common	__fl_common;
154 		struct flowi4		ip4;
155 		struct flowi6		ip6;
156 		struct flowidn		dn;
157 	} u;
158 #define flowi_oif	u.__fl_common.flowic_oif
159 #define flowi_iif	u.__fl_common.flowic_iif
160 #define flowi_mark	u.__fl_common.flowic_mark
161 #define flowi_tos	u.__fl_common.flowic_tos
162 #define flowi_scope	u.__fl_common.flowic_scope
163 #define flowi_proto	u.__fl_common.flowic_proto
164 #define flowi_flags	u.__fl_common.flowic_flags
165 #define flowi_secid	u.__fl_common.flowic_secid
166 #define flowi_uid	u.__fl_common.flowic_uid
167 } __attribute__((__aligned__(BITS_PER_LONG/8)));
168 
flowi4_to_flowi(struct flowi4 * fl4)169 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
170 {
171 	return container_of(fl4, struct flowi, u.ip4);
172 }
173 
flowi6_to_flowi(struct flowi6 * fl6)174 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
175 {
176 	return container_of(fl6, struct flowi, u.ip6);
177 }
178 
flowidn_to_flowi(struct flowidn * fldn)179 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
180 {
181 	return container_of(fldn, struct flowi, u.dn);
182 }
183 
184 typedef unsigned long flow_compare_t;
185 
flow_key_size(u16 family)186 static inline size_t flow_key_size(u16 family)
187 {
188 	switch (family) {
189 	case AF_INET:
190 		BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
191 		return sizeof(struct flowi4) / sizeof(flow_compare_t);
192 	case AF_INET6:
193 		BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
194 		return sizeof(struct flowi6) / sizeof(flow_compare_t);
195 	case AF_DECnet:
196 		BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
197 		return sizeof(struct flowidn) / sizeof(flow_compare_t);
198 	}
199 	return 0;
200 }
201 
202 #define FLOW_DIR_IN	0
203 #define FLOW_DIR_OUT	1
204 #define FLOW_DIR_FWD	2
205 
206 struct net;
207 struct sock;
208 struct flow_cache_ops;
209 
210 struct flow_cache_object {
211 	const struct flow_cache_ops *ops;
212 };
213 
214 struct flow_cache_ops {
215 	struct flow_cache_object *(*get)(struct flow_cache_object *);
216 	int (*check)(struct flow_cache_object *);
217 	void (*delete)(struct flow_cache_object *);
218 };
219 
220 typedef struct flow_cache_object *(*flow_resolve_t)(
221 		struct net *net, const struct flowi *key, u16 family,
222 		u8 dir, struct flow_cache_object *oldobj, void *ctx);
223 
224 extern struct flow_cache_object *flow_cache_lookup(
225 		struct net *net, const struct flowi *key, u16 family,
226 		u8 dir, flow_resolve_t resolver, void *ctx);
227 
228 extern void flow_cache_flush(void);
229 extern void flow_cache_flush_deferred(void);
230 extern atomic_t flow_cache_genid;
231 
232 #endif
233