1
2#define KMSG_COMPONENT "IPVS"
3#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
4
5#include <linux/module.h>
6#include <linux/spinlock.h>
7#include <linux/interrupt.h>
8#include <asm/string.h>
9#include <linux/kmod.h>
10#include <linux/sysctl.h>
11
12#include <net/ip_vs.h>
13
14
15static LIST_HEAD(ip_vs_pe);
16
17
18static DEFINE_MUTEX(ip_vs_pe_mutex);
19
20
21struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name)
22{
23 struct ip_vs_pe *pe;
24
25 IP_VS_DBG(10, "%s(): pe_name \"%s\"\n", __func__,
26 pe_name);
27
28 rcu_read_lock();
29 list_for_each_entry_rcu(pe, &ip_vs_pe, n_list) {
30
31 if (pe->module &&
32 !try_module_get(pe->module)) {
33
34 continue;
35 }
36 if (strcmp(pe_name, pe->name)==0) {
37
38 rcu_read_unlock();
39 return pe;
40 }
41 module_put(pe->module);
42 }
43 rcu_read_unlock();
44
45 return NULL;
46}
47
48
49struct ip_vs_pe *ip_vs_pe_getbyname(const char *name)
50{
51 struct ip_vs_pe *pe;
52
53
54 pe = __ip_vs_pe_getbyname(name);
55
56
57 if (!pe) {
58 request_module("ip_vs_pe_%s", name);
59 pe = __ip_vs_pe_getbyname(name);
60 }
61
62 return pe;
63}
64
65
66int register_ip_vs_pe(struct ip_vs_pe *pe)
67{
68 struct ip_vs_pe *tmp;
69
70
71 ip_vs_use_count_inc();
72
73 mutex_lock(&ip_vs_pe_mutex);
74
75
76
77 list_for_each_entry(tmp, &ip_vs_pe, n_list) {
78 if (strcmp(tmp->name, pe->name) == 0) {
79 mutex_unlock(&ip_vs_pe_mutex);
80 ip_vs_use_count_dec();
81 pr_err("%s(): [%s] pe already existed "
82 "in the system\n", __func__, pe->name);
83 return -EINVAL;
84 }
85 }
86
87 list_add_rcu(&pe->n_list, &ip_vs_pe);
88 mutex_unlock(&ip_vs_pe_mutex);
89
90 pr_info("[%s] pe registered.\n", pe->name);
91
92 return 0;
93}
94EXPORT_SYMBOL_GPL(register_ip_vs_pe);
95
96
97int unregister_ip_vs_pe(struct ip_vs_pe *pe)
98{
99 mutex_lock(&ip_vs_pe_mutex);
100
101 list_del_rcu(&pe->n_list);
102 mutex_unlock(&ip_vs_pe_mutex);
103
104
105 ip_vs_use_count_dec();
106
107 pr_info("[%s] pe unregistered.\n", pe->name);
108
109 return 0;
110}
111EXPORT_SYMBOL_GPL(unregister_ip_vs_pe);
112