1 #define KMSG_COMPONENT "IPVS"
2 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
4 #include <linux/module.h>
5 #include <linux/spinlock.h>
6 #include <linux/interrupt.h>
7 #include <asm/string.h>
8 #include <linux/kmod.h>
9 #include <linux/sysctl.h>
11 #include <net/ip_vs.h>
14 static LIST_HEAD(ip_vs_pe);
16 /* lock for service table */
17 static DEFINE_SPINLOCK(ip_vs_pe_lock);
19 /* Bind a service with a pe */
20 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe)
25 /* Unbind a service from its pe */
26 void ip_vs_unbind_pe(struct ip_vs_service *svc)
31 /* Get pe in the pe list by name */
32 static struct ip_vs_pe *
33 ip_vs_pe_getbyname(const char *pe_name)
37 IP_VS_DBG(2, "%s(): pe_name \"%s\"\n", __func__,
40 spin_lock_bh(&ip_vs_pe_lock);
42 list_for_each_entry(pe, &ip_vs_pe, n_list) {
43 /* Test and get the modules atomically */
45 !try_module_get(pe->module)) {
46 /* This pe is just deleted */
49 if (strcmp(pe_name, pe->name)==0) {
51 spin_unlock_bh(&ip_vs_pe_lock);
55 module_put(pe->module);
58 spin_unlock_bh(&ip_vs_pe_lock);
62 /* Lookup pe and try to load it if it doesn't exist */
63 struct ip_vs_pe *ip_vs_pe_get(const char *name)
67 /* Search for the pe by name */
68 pe = ip_vs_pe_getbyname(name);
70 /* If pe not found, load the module and search again */
72 request_module("ip_vs_pe_%s", name);
73 pe = ip_vs_pe_getbyname(name);
79 void ip_vs_pe_put(struct ip_vs_pe *pe)
82 module_put(pe->module);
85 /* Register a pe in the pe list */
86 int register_ip_vs_pe(struct ip_vs_pe *pe)
90 /* increase the module use count */
91 ip_vs_use_count_inc();
93 spin_lock_bh(&ip_vs_pe_lock);
95 if (!list_empty(&pe->n_list)) {
96 spin_unlock_bh(&ip_vs_pe_lock);
97 ip_vs_use_count_dec();
98 pr_err("%s(): [%s] pe already linked\n",
103 /* Make sure that the pe with this name doesn't exist
106 list_for_each_entry(tmp, &ip_vs_pe, n_list) {
107 if (strcmp(tmp->name, pe->name) == 0) {
108 spin_unlock_bh(&ip_vs_pe_lock);
109 ip_vs_use_count_dec();
110 pr_err("%s(): [%s] pe already existed "
111 "in the system\n", __func__, pe->name);
115 /* Add it into the d-linked pe list */
116 list_add(&pe->n_list, &ip_vs_pe);
117 spin_unlock_bh(&ip_vs_pe_lock);
119 pr_info("[%s] pe registered.\n", pe->name);
123 EXPORT_SYMBOL_GPL(register_ip_vs_pe);
125 /* Unregister a pe from the pe list */
126 int unregister_ip_vs_pe(struct ip_vs_pe *pe)
128 spin_lock_bh(&ip_vs_pe_lock);
129 if (list_empty(&pe->n_list)) {
130 spin_unlock_bh(&ip_vs_pe_lock);
131 pr_err("%s(): [%s] pe is not in the list. failed\n",
136 /* Remove it from the d-linked pe list */
137 list_del(&pe->n_list);
138 spin_unlock_bh(&ip_vs_pe_lock);
140 /* decrease the module use count */
141 ip_vs_use_count_dec();
143 pr_info("[%s] pe unregistered.\n", pe->name);
147 EXPORT_SYMBOL_GPL(unregister_ip_vs_pe);