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