blob: baf4f414d00c3c19e29254bc36bb22e4748bab3d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* net/dst.h Protocol independent destination cache definitions.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#ifndef _NET_DST_H
#define _NET_DST_H
#include <linux/config.h>
#include <net/neighbour.h>
/*
* 0 - no debugging messages
* 1 - rare events and bugs (default)
* 2 - trace mode.
*/
#define RT_CACHE_DEBUG 0
#define DST_GC_MIN (1*HZ)
#define DST_GC_INC (5*HZ)
#define DST_GC_MAX (120*HZ)
struct sk_buff;
struct dst_entry
{
struct dst_entry *next;
atomic_t refcnt; /* tree/hash references */
atomic_t use; /* client references */
struct device *dev;
int obsolete;
unsigned long lastuse;
unsigned long expires;
unsigned mxlock;
unsigned pmtu;
unsigned window;
unsigned rtt;
unsigned long rate_last; /* rate limiting for ICMP */
unsigned long rate_tokens;
int error;
struct neighbour *neighbour;
struct hh_cache *hh;
int (*input)(struct sk_buff*);
int (*output)(struct sk_buff*);
#ifdef CONFIG_NET_CLS_ROUTE
__u32 tclassid;
#endif
struct dst_ops *ops;
char info[0];
};
struct dst_ops
{
unsigned short family;
unsigned short protocol;
unsigned gc_thresh;
int (*gc)(void);
struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
struct dst_entry * (*reroute)(struct dst_entry *,
struct sk_buff *);
void (*destroy)(struct dst_entry *);
struct dst_entry * (*negative_advice)(struct dst_entry *);
void (*link_failure)(struct sk_buff *);
atomic_t entries;
};
#ifdef __KERNEL__
extern struct dst_entry * dst_garbage_list;
extern atomic_t dst_total;
extern __inline__
struct dst_entry * dst_clone(struct dst_entry * dst)
{
if (dst)
atomic_inc(&dst->use);
return dst;
}
extern __inline__
void dst_release(struct dst_entry * dst)
{
if (dst)
atomic_dec(&dst->use);
}
/* The following primitive should be use if and only if
destination entry has just been removed from a location
accessed directly by hard irq.
*/
extern __inline__
void dst_release_irqwait(struct dst_entry * dst)
{
if (dst) {
synchronize_irq();
atomic_dec(&dst->use);
}
}
extern __inline__
struct dst_entry * dst_check(struct dst_entry ** dst_p, u32 cookie)
{
struct dst_entry * dst = *dst_p;
if (dst && dst->obsolete)
dst = dst->ops->check(dst, cookie);
return (*dst_p = dst);
}
extern __inline__
struct dst_entry * dst_reroute(struct dst_entry ** dst_p, struct sk_buff *skb)
{
struct dst_entry * dst = *dst_p;
if (dst && dst->obsolete)
dst = dst->ops->reroute(dst, skb);
return (*dst_p = dst);
}
extern void * dst_alloc(int size, struct dst_ops * ops);
extern void __dst_free(struct dst_entry * dst);
extern void dst_destroy(struct dst_entry * dst);
extern __inline__
void dst_free(struct dst_entry * dst)
{
if (dst->obsolete > 1)
return;
if (!atomic_read(&dst->use)) {
dst_destroy(dst);
return;
}
__dst_free(dst);
}
extern __inline__ void dst_confirm(struct dst_entry *dst)
{
if (dst)
neigh_confirm(dst->neighbour);
}
extern __inline__ void dst_negative_advice(struct dst_entry **dst_p)
{
struct dst_entry * dst = *dst_p;
if (dst && dst->ops->negative_advice)
*dst_p = dst->ops->negative_advice(dst);
}
extern __inline__ void dst_link_failure(struct sk_buff *skb)
{
struct dst_entry * dst = skb->dst;
if (dst && dst->ops && dst->ops->link_failure)
dst->ops->link_failure(skb);
}
extern __inline__ void dst_set_expires(struct dst_entry *dst, int timeout)
{
unsigned long expires = jiffies + timeout;
if (expires == 0)
expires = 1;
if (dst->expires == 0 || (long)(dst->expires - expires) > 0)
dst->expires = expires;
}
#endif
#endif /* _NET_DST_H */
|
