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