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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/*
* ip_vs_proto.c: transport protocol load balancing support for IPVS
*
* Version: $Id: ip_vs_proto.c,v 1.2 2003/04/18 09:03:16 wensong Exp $
*
* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
* Julian Anastasov <ja@ssi.bg>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Changes:
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <asm/system.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
#include <net/ip_vs.h>
/*
* IPVS protocols can only be registered/unregistered when the ipvs
* module is loaded/unloaded, so no lock is needed in accessing the
* ipvs protocol table.
*/
#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
#define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
static struct ip_vs_protocol *ip_vs_proto_table[IP_VS_PROTO_TAB_SIZE];
/*
* register an ipvs protocol
*/
static int register_ip_vs_protocol(struct ip_vs_protocol *pp)
{
unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
pp->next = ip_vs_proto_table[hash];
ip_vs_proto_table[hash] = pp;
if (pp->init != NULL)
pp->init(pp);
return 0;
}
/*
* unregister an ipvs protocol
*/
static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
{
struct ip_vs_protocol **pp_p;
unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
pp_p = &ip_vs_proto_table[hash];
for (; *pp_p; pp_p = &(*pp_p)->next) {
if (*pp_p == pp) {
*pp_p = pp->next;
if (pp->exit != NULL)
pp->exit(pp);
return 0;
}
}
return -ESRCH;
}
/*
* get ip_vs_protocol object by its proto.
*/
struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
{
struct ip_vs_protocol *pp;
unsigned hash = IP_VS_PROTO_HASH(proto);
for (pp = ip_vs_proto_table[hash]; pp; pp = pp->next) {
if (pp->protocol == proto)
return pp;
}
return NULL;
}
/*
* Propagate event for state change to all protocols
*/
void ip_vs_protocol_timeout_change(int flags)
{
struct ip_vs_protocol *pp;
int i;
for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
for (pp = ip_vs_proto_table[i]; pp; pp = pp->next) {
if (pp->timeout_change)
pp->timeout_change(pp, flags);
}
}
}
int *
ip_vs_create_timeout_table(int *table, int size)
{
int *t;
t = kmalloc(size, GFP_ATOMIC);
if (t == NULL)
return NULL;
memcpy(t, table, size);
return t;
}
/*
* Set timeout value for state specified by name
*/
int
ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to)
{
int i;
if (!table || !name || !to)
return -EINVAL;
for (i = 0; i < num; i++) {
if (strcmp(names[i], name))
continue;
table[i] = to * HZ;
return 0;
}
return -ENOENT;
}
const char * ip_vs_state_name(__u16 proto, int state)
{
struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
if (pp == NULL || pp->state_name == NULL)
return "ERR!";
return pp->state_name(state);
}
void
ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp,
const struct sk_buff *skb,
int offset,
const char *msg)
{
char buf[128];
struct iphdr _iph, *ih;
ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
if (ih == NULL)
sprintf(buf, "%s TRUNCATED", pp->name);
else if (ih->frag_off & __constant_htons(IP_OFFSET))
sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
pp->name, NIPQUAD(ih->saddr),
NIPQUAD(ih->daddr));
else {
__u16 _ports[2], *pptr
;
pptr = skb_header_pointer(skb, offset + ih->ihl*4,
sizeof(_ports), _ports);
if (pptr == NULL)
sprintf(buf, "%s TRUNCATED %u.%u.%u.%u->%u.%u.%u.%u",
pp->name,
NIPQUAD(ih->saddr),
NIPQUAD(ih->daddr));
else
sprintf(buf, "%s %u.%u.%u.%u:%u->%u.%u.%u.%u:%u",
pp->name,
NIPQUAD(ih->saddr),
ntohs(pptr[0]),
NIPQUAD(ih->daddr),
ntohs(pptr[1]));
}
printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
}
int ip_vs_protocol_init(void)
{
char protocols[64];
#define REGISTER_PROTOCOL(p) \
do { \
register_ip_vs_protocol(p); \
strcat(protocols, ", "); \
strcat(protocols, (p)->name); \
} while (0)
protocols[0] = '\0';
protocols[2] = '\0';
#ifdef CONFIG_IP_VS_PROTO_TCP
REGISTER_PROTOCOL(&ip_vs_protocol_tcp);
#endif
#ifdef CONFIG_IP_VS_PROTO_UDP
REGISTER_PROTOCOL(&ip_vs_protocol_udp);
#endif
#ifdef CONFIG_IP_VS_PROTO_ICMP
REGISTER_PROTOCOL(&ip_vs_protocol_icmp);
#endif
#ifdef CONFIG_IP_VS_PROTO_AH
REGISTER_PROTOCOL(&ip_vs_protocol_ah);
#endif
#ifdef CONFIG_IP_VS_PROTO_ESP
REGISTER_PROTOCOL(&ip_vs_protocol_esp);
#endif
IP_VS_INFO("Registered protocols (%s)\n", &protocols[2]);
return 0;
}
void ip_vs_protocol_cleanup(void)
{
struct ip_vs_protocol *pp;
int i;
/* unregister all the ipvs protocols */
for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
while ((pp = ip_vs_proto_table[i]) != NULL)
unregister_ip_vs_protocol(pp);
}
}
|
