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- /*
- * IPVS: Weighted Fail Over module
- *
- * Authors: Kenny Mathis <kmathis@chokepoint.net>
- *
- * 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:
- * Kenny Mathis : added initial functionality based on weight
- *
- */
- #define KMSG_COMPONENT "IPVS"
- #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <net/ip_vs.h>
- /* Weighted Fail Over Module */
- static struct ip_vs_dest *
- ip_vs_fo_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
- struct ip_vs_iphdr *iph)
- {
- struct ip_vs_dest *dest, *hweight = NULL;
- int hw = 0; /* Track highest weight */
- IP_VS_DBG(6, "ip_vs_fo_schedule(): Scheduling...\n");
- /* Basic failover functionality
- * Find virtual server with highest weight and send it traffic
- */
- list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
- atomic_read(&dest->weight) > hw) {
- hweight = dest;
- hw = atomic_read(&dest->weight);
- }
- }
- if (hweight) {
- IP_VS_DBG_BUF(6, "FO: server %s:%u activeconns %d weight %d\n",
- IP_VS_DBG_ADDR(hweight->af, &hweight->addr),
- ntohs(hweight->port),
- atomic_read(&hweight->activeconns),
- atomic_read(&hweight->weight));
- return hweight;
- }
- ip_vs_scheduler_err(svc, "no destination available");
- return NULL;
- }
- static struct ip_vs_scheduler ip_vs_fo_scheduler = {
- .name = "fo",
- .refcnt = ATOMIC_INIT(0),
- .module = THIS_MODULE,
- .n_list = LIST_HEAD_INIT(ip_vs_fo_scheduler.n_list),
- .schedule = ip_vs_fo_schedule,
- };
- static int __init ip_vs_fo_init(void)
- {
- return register_ip_vs_scheduler(&ip_vs_fo_scheduler);
- }
- static void __exit ip_vs_fo_cleanup(void)
- {
- unregister_ip_vs_scheduler(&ip_vs_fo_scheduler);
- synchronize_rcu();
- }
- module_init(ip_vs_fo_init);
- module_exit(ip_vs_fo_cleanup);
- MODULE_LICENSE("GPL");
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