// SPDX-License-Identifier: GPL-2.0-only
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#define KMSG_COMPONENT "IPVS"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <asm/string.h>
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#include <linux/kmod.h>
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#include <linux/sysctl.h>
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#include <net/ip_vs.h>
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/* IPVS pe list */
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static LIST_HEAD(ip_vs_pe);
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/* semaphore for IPVS PEs. */
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static DEFINE_MUTEX(ip_vs_pe_mutex);
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/* Get pe in the pe list by name */
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struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name)
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{
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struct ip_vs_pe *pe;
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IP_VS_DBG(10, "%s(): pe_name \"%s\"\n", __func__,
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pe_name);
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rcu_read_lock();
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list_for_each_entry_rcu(pe, &ip_vs_pe, n_list) {
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/* Test and get the modules atomically */
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if (pe->module &&
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!try_module_get(pe->module)) {
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/* This pe is just deleted */
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continue;
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}
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if (strcmp(pe_name, pe->name)==0) {
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/* HIT */
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rcu_read_unlock();
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return pe;
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}
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module_put(pe->module);
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}
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rcu_read_unlock();
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return NULL;
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}
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/* Lookup pe and try to load it if it doesn't exist */
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struct ip_vs_pe *ip_vs_pe_getbyname(const char *name)
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{
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struct ip_vs_pe *pe;
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/* Search for the pe by name */
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pe = __ip_vs_pe_getbyname(name);
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/* If pe not found, load the module and search again */
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if (!pe) {
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request_module("ip_vs_pe_%s", name);
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pe = __ip_vs_pe_getbyname(name);
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}
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return pe;
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}
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/* Register a pe in the pe list */
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int register_ip_vs_pe(struct ip_vs_pe *pe)
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{
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struct ip_vs_pe *tmp;
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/* increase the module use count */
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if (!ip_vs_use_count_inc())
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return -ENOENT;
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mutex_lock(&ip_vs_pe_mutex);
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/* Make sure that the pe with this name doesn't exist
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* in the pe list.
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*/
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list_for_each_entry(tmp, &ip_vs_pe, n_list) {
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if (strcmp(tmp->name, pe->name) == 0) {
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mutex_unlock(&ip_vs_pe_mutex);
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ip_vs_use_count_dec();
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pr_err("%s(): [%s] pe already existed "
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"in the system\n", __func__, pe->name);
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return -EINVAL;
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}
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}
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/* Add it into the d-linked pe list */
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list_add_rcu(&pe->n_list, &ip_vs_pe);
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mutex_unlock(&ip_vs_pe_mutex);
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pr_info("[%s] pe registered.\n", pe->name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(register_ip_vs_pe);
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/* Unregister a pe from the pe list */
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int unregister_ip_vs_pe(struct ip_vs_pe *pe)
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{
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mutex_lock(&ip_vs_pe_mutex);
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/* Remove it from the d-linked pe list */
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list_del_rcu(&pe->n_list);
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mutex_unlock(&ip_vs_pe_mutex);
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/* decrease the module use count */
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ip_vs_use_count_dec();
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pr_info("[%s] pe unregistered.\n", pe->name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(unregister_ip_vs_pe);
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