1349 lines
34 KiB
C
1349 lines
34 KiB
C
/*
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* IPVS An implementation of the IP virtual server support for the
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* LINUX operating system. IPVS is now implemented as a module
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* over the Netfilter framework. IPVS can be used to build a
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* high-performance and highly available server based on a
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* cluster of servers.
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*
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* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
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* Peter Kese <peter.kese@ijs.si>
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* Julian Anastasov <ja@ssi.bg>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
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* with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
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* and others. Many code here is taken from IP MASQ code of kernel 2.2.
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*
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* Changes:
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*
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*/
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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/interrupt.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/proc_fs.h> /* for proc_net_* */
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <linux/jhash.h>
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#include <linux/random.h>
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#include <net/net_namespace.h>
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#include <net/ip_vs.h>
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#ifndef CONFIG_IP_VS_TAB_BITS
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#define CONFIG_IP_VS_TAB_BITS 12
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#endif
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/*
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* Connection hash size. Default is what was selected at compile time.
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*/
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static int ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS;
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module_param_named(conn_tab_bits, ip_vs_conn_tab_bits, int, 0444);
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MODULE_PARM_DESC(conn_tab_bits, "Set connections' hash size");
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/* size and mask values */
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int ip_vs_conn_tab_size __read_mostly;
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static int ip_vs_conn_tab_mask __read_mostly;
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/*
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* Connection hash table: for input and output packets lookups of IPVS
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*/
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static struct hlist_head *ip_vs_conn_tab __read_mostly;
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/* SLAB cache for IPVS connections */
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static struct kmem_cache *ip_vs_conn_cachep __read_mostly;
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/* counter for no client port connections */
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static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0);
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/* random value for IPVS connection hash */
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static unsigned int ip_vs_conn_rnd __read_mostly;
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/*
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* Fine locking granularity for big connection hash table
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*/
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#define CT_LOCKARRAY_BITS 5
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#define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
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#define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
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struct ip_vs_aligned_lock
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{
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rwlock_t l;
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} __attribute__((__aligned__(SMP_CACHE_BYTES)));
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/* lock array for conn table */
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static struct ip_vs_aligned_lock
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__ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned;
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static inline void ct_read_lock(unsigned int key)
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{
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read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_read_unlock(unsigned int key)
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{
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read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_write_lock(unsigned int key)
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{
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write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_write_unlock(unsigned int key)
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{
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write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_read_lock_bh(unsigned int key)
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{
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read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_read_unlock_bh(unsigned int key)
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{
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read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_write_lock_bh(unsigned int key)
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{
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write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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static inline void ct_write_unlock_bh(unsigned int key)
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{
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write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
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}
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/*
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* Returns hash value for IPVS connection entry
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*/
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static unsigned int ip_vs_conn_hashkey(struct net *net, int af, unsigned int proto,
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const union nf_inet_addr *addr,
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__be16 port)
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{
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6)
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return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd),
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(__force u32)port, proto, ip_vs_conn_rnd) ^
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((size_t)net>>8)) & ip_vs_conn_tab_mask;
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#endif
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return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto,
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ip_vs_conn_rnd) ^
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((size_t)net>>8)) & ip_vs_conn_tab_mask;
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}
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static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p,
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bool inverse)
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{
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const union nf_inet_addr *addr;
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__be16 port;
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if (p->pe_data && p->pe->hashkey_raw)
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return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) &
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ip_vs_conn_tab_mask;
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if (likely(!inverse)) {
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addr = p->caddr;
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port = p->cport;
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} else {
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addr = p->vaddr;
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port = p->vport;
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}
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return ip_vs_conn_hashkey(p->net, p->af, p->protocol, addr, port);
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}
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static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp)
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{
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struct ip_vs_conn_param p;
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ip_vs_conn_fill_param(ip_vs_conn_net(cp), cp->af, cp->protocol,
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&cp->caddr, cp->cport, NULL, 0, &p);
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if (cp->pe) {
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p.pe = cp->pe;
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p.pe_data = cp->pe_data;
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p.pe_data_len = cp->pe_data_len;
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}
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return ip_vs_conn_hashkey_param(&p, false);
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}
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/*
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* Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port.
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* returns bool success.
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*/
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static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
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{
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unsigned int hash;
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int ret;
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if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
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return 0;
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/* Hash by protocol, client address and port */
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hash = ip_vs_conn_hashkey_conn(cp);
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ct_write_lock(hash);
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spin_lock(&cp->lock);
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if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
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hlist_add_head(&cp->c_list, &ip_vs_conn_tab[hash]);
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cp->flags |= IP_VS_CONN_F_HASHED;
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atomic_inc(&cp->refcnt);
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ret = 1;
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} else {
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pr_err("%s(): request for already hashed, called from %pF\n",
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__func__, __builtin_return_address(0));
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ret = 0;
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}
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spin_unlock(&cp->lock);
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ct_write_unlock(hash);
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return ret;
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}
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/*
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* UNhashes ip_vs_conn from ip_vs_conn_tab.
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* returns bool success.
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*/
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static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
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{
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unsigned int hash;
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int ret;
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/* unhash it and decrease its reference counter */
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hash = ip_vs_conn_hashkey_conn(cp);
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ct_write_lock(hash);
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spin_lock(&cp->lock);
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if (cp->flags & IP_VS_CONN_F_HASHED) {
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hlist_del(&cp->c_list);
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cp->flags &= ~IP_VS_CONN_F_HASHED;
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atomic_dec(&cp->refcnt);
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ret = 1;
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} else
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ret = 0;
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spin_unlock(&cp->lock);
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ct_write_unlock(hash);
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return ret;
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}
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/*
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* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
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* Called for pkts coming from OUTside-to-INside.
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* p->caddr, p->cport: pkt source address (foreign host)
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* p->vaddr, p->vport: pkt dest address (load balancer)
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*/
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static inline struct ip_vs_conn *
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__ip_vs_conn_in_get(const struct ip_vs_conn_param *p)
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{
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unsigned int hash;
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struct ip_vs_conn *cp;
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hash = ip_vs_conn_hashkey_param(p, false);
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ct_read_lock(hash);
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hlist_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
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if (cp->af == p->af &&
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p->cport == cp->cport && p->vport == cp->vport &&
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ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
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ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) &&
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((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
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p->protocol == cp->protocol &&
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ip_vs_conn_net_eq(cp, p->net)) {
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/* HIT */
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atomic_inc(&cp->refcnt);
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ct_read_unlock(hash);
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return cp;
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}
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}
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ct_read_unlock(hash);
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return NULL;
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}
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struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p)
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{
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struct ip_vs_conn *cp;
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cp = __ip_vs_conn_in_get(p);
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if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) {
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struct ip_vs_conn_param cport_zero_p = *p;
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cport_zero_p.cport = 0;
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cp = __ip_vs_conn_in_get(&cport_zero_p);
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}
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IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
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ip_vs_proto_name(p->protocol),
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IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
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IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
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cp ? "hit" : "not hit");
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return cp;
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}
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static int
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ip_vs_conn_fill_param_proto(int af, const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph,
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int inverse, struct ip_vs_conn_param *p)
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{
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__be16 _ports[2], *pptr;
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struct net *net = skb_net(skb);
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pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
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if (pptr == NULL)
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return 1;
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if (likely(!inverse))
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ip_vs_conn_fill_param(net, af, iph->protocol, &iph->saddr,
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pptr[0], &iph->daddr, pptr[1], p);
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else
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ip_vs_conn_fill_param(net, af, iph->protocol, &iph->daddr,
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pptr[1], &iph->saddr, pptr[0], p);
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return 0;
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}
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struct ip_vs_conn *
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ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph, int inverse)
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{
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struct ip_vs_conn_param p;
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if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p))
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return NULL;
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return ip_vs_conn_in_get(&p);
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}
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EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto);
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/* Get reference to connection template */
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struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p)
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{
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unsigned int hash;
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struct ip_vs_conn *cp;
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hash = ip_vs_conn_hashkey_param(p, false);
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ct_read_lock(hash);
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hlist_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
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if (!ip_vs_conn_net_eq(cp, p->net))
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continue;
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if (p->pe_data && p->pe->ct_match) {
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if (p->pe == cp->pe && p->pe->ct_match(p, cp))
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goto out;
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continue;
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}
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if (cp->af == p->af &&
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ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
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/* protocol should only be IPPROTO_IP if
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* p->vaddr is a fwmark */
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ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC :
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p->af, p->vaddr, &cp->vaddr) &&
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p->cport == cp->cport && p->vport == cp->vport &&
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cp->flags & IP_VS_CONN_F_TEMPLATE &&
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p->protocol == cp->protocol)
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goto out;
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}
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cp = NULL;
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out:
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if (cp)
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atomic_inc(&cp->refcnt);
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ct_read_unlock(hash);
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IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
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ip_vs_proto_name(p->protocol),
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IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
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IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
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cp ? "hit" : "not hit");
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return cp;
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}
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/* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
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* Called for pkts coming from inside-to-OUTside.
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* p->caddr, p->cport: pkt source address (inside host)
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* p->vaddr, p->vport: pkt dest address (foreign host) */
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struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p)
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{
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unsigned int hash;
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struct ip_vs_conn *cp, *ret=NULL;
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/*
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* Check for "full" addressed entries
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*/
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hash = ip_vs_conn_hashkey_param(p, true);
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ct_read_lock(hash);
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hlist_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
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if (cp->af == p->af &&
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p->vport == cp->cport && p->cport == cp->dport &&
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ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) &&
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ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) &&
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p->protocol == cp->protocol &&
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ip_vs_conn_net_eq(cp, p->net)) {
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/* HIT */
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atomic_inc(&cp->refcnt);
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ret = cp;
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break;
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}
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}
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ct_read_unlock(hash);
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IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
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ip_vs_proto_name(p->protocol),
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IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
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IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
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ret ? "hit" : "not hit");
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return ret;
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}
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|
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struct ip_vs_conn *
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ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph, int inverse)
|
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{
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struct ip_vs_conn_param p;
|
|
|
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if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p))
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return NULL;
|
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|
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return ip_vs_conn_out_get(&p);
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}
|
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EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto);
|
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|
|
/*
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* Put back the conn and restart its timer with its timeout
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|
*/
|
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void ip_vs_conn_put(struct ip_vs_conn *cp)
|
|
{
|
|
unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
|
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0 : cp->timeout;
|
|
mod_timer(&cp->timer, jiffies+t);
|
|
|
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__ip_vs_conn_put(cp);
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}
|
|
|
|
|
|
/*
|
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* Fill a no_client_port connection with a client port number
|
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*/
|
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void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
|
|
{
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if (ip_vs_conn_unhash(cp)) {
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spin_lock(&cp->lock);
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if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
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atomic_dec(&ip_vs_conn_no_cport_cnt);
|
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cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
|
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cp->cport = cport;
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}
|
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spin_unlock(&cp->lock);
|
|
|
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/* hash on new dport */
|
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ip_vs_conn_hash(cp);
|
|
}
|
|
}
|
|
|
|
|
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/*
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* Bind a connection entry with the corresponding packet_xmit.
|
|
* Called by ip_vs_conn_new.
|
|
*/
|
|
static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
|
|
{
|
|
switch (IP_VS_FWD_METHOD(cp)) {
|
|
case IP_VS_CONN_F_MASQ:
|
|
cp->packet_xmit = ip_vs_nat_xmit;
|
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break;
|
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|
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case IP_VS_CONN_F_TUNNEL:
|
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cp->packet_xmit = ip_vs_tunnel_xmit;
|
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break;
|
|
|
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case IP_VS_CONN_F_DROUTE:
|
|
cp->packet_xmit = ip_vs_dr_xmit;
|
|
break;
|
|
|
|
case IP_VS_CONN_F_LOCALNODE:
|
|
cp->packet_xmit = ip_vs_null_xmit;
|
|
break;
|
|
|
|
case IP_VS_CONN_F_BYPASS:
|
|
cp->packet_xmit = ip_vs_bypass_xmit;
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp)
|
|
{
|
|
switch (IP_VS_FWD_METHOD(cp)) {
|
|
case IP_VS_CONN_F_MASQ:
|
|
cp->packet_xmit = ip_vs_nat_xmit_v6;
|
|
break;
|
|
|
|
case IP_VS_CONN_F_TUNNEL:
|
|
cp->packet_xmit = ip_vs_tunnel_xmit_v6;
|
|
break;
|
|
|
|
case IP_VS_CONN_F_DROUTE:
|
|
cp->packet_xmit = ip_vs_dr_xmit_v6;
|
|
break;
|
|
|
|
case IP_VS_CONN_F_LOCALNODE:
|
|
cp->packet_xmit = ip_vs_null_xmit;
|
|
break;
|
|
|
|
case IP_VS_CONN_F_BYPASS:
|
|
cp->packet_xmit = ip_vs_bypass_xmit_v6;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
|
|
{
|
|
return atomic_read(&dest->activeconns)
|
|
+ atomic_read(&dest->inactconns);
|
|
}
|
|
|
|
/*
|
|
* Bind a connection entry with a virtual service destination
|
|
* Called just after a new connection entry is created.
|
|
*/
|
|
static inline void
|
|
ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
|
|
{
|
|
unsigned int conn_flags;
|
|
__u32 flags;
|
|
|
|
/* if dest is NULL, then return directly */
|
|
if (!dest)
|
|
return;
|
|
|
|
/* Increase the refcnt counter of the dest */
|
|
atomic_inc(&dest->refcnt);
|
|
|
|
conn_flags = atomic_read(&dest->conn_flags);
|
|
if (cp->protocol != IPPROTO_UDP)
|
|
conn_flags &= ~IP_VS_CONN_F_ONE_PACKET;
|
|
flags = cp->flags;
|
|
/* Bind with the destination and its corresponding transmitter */
|
|
if (flags & IP_VS_CONN_F_SYNC) {
|
|
/* if the connection is not template and is created
|
|
* by sync, preserve the activity flag.
|
|
*/
|
|
if (!(flags & IP_VS_CONN_F_TEMPLATE))
|
|
conn_flags &= ~IP_VS_CONN_F_INACTIVE;
|
|
/* connections inherit forwarding method from dest */
|
|
flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT);
|
|
}
|
|
flags |= conn_flags;
|
|
cp->flags = flags;
|
|
cp->dest = dest;
|
|
|
|
IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
|
|
"d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
|
|
"dest->refcnt:%d\n",
|
|
ip_vs_proto_name(cp->protocol),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
|
|
ip_vs_fwd_tag(cp), cp->state,
|
|
cp->flags, atomic_read(&cp->refcnt),
|
|
atomic_read(&dest->refcnt));
|
|
|
|
/* Update the connection counters */
|
|
if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
|
|
/* It is a normal connection, so modify the counters
|
|
* according to the flags, later the protocol can
|
|
* update them on state change
|
|
*/
|
|
if (!(flags & IP_VS_CONN_F_INACTIVE))
|
|
atomic_inc(&dest->activeconns);
|
|
else
|
|
atomic_inc(&dest->inactconns);
|
|
} else {
|
|
/* It is a persistent connection/template, so increase
|
|
the persistent connection counter */
|
|
atomic_inc(&dest->persistconns);
|
|
}
|
|
|
|
if (dest->u_threshold != 0 &&
|
|
ip_vs_dest_totalconns(dest) >= dest->u_threshold)
|
|
dest->flags |= IP_VS_DEST_F_OVERLOAD;
|
|
}
|
|
|
|
|
|
/*
|
|
* Check if there is a destination for the connection, if so
|
|
* bind the connection to the destination.
|
|
*/
|
|
struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp)
|
|
{
|
|
struct ip_vs_dest *dest;
|
|
|
|
dest = ip_vs_find_dest(ip_vs_conn_net(cp), cp->af, &cp->daddr,
|
|
cp->dport, &cp->vaddr, cp->vport,
|
|
cp->protocol, cp->fwmark, cp->flags);
|
|
if (dest) {
|
|
struct ip_vs_proto_data *pd;
|
|
|
|
spin_lock(&cp->lock);
|
|
if (cp->dest) {
|
|
spin_unlock(&cp->lock);
|
|
return dest;
|
|
}
|
|
|
|
/* Applications work depending on the forwarding method
|
|
* but better to reassign them always when binding dest */
|
|
if (cp->app)
|
|
ip_vs_unbind_app(cp);
|
|
|
|
ip_vs_bind_dest(cp, dest);
|
|
spin_unlock(&cp->lock);
|
|
|
|
/* Update its packet transmitter */
|
|
cp->packet_xmit = NULL;
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
if (cp->af == AF_INET6)
|
|
ip_vs_bind_xmit_v6(cp);
|
|
else
|
|
#endif
|
|
ip_vs_bind_xmit(cp);
|
|
|
|
pd = ip_vs_proto_data_get(ip_vs_conn_net(cp), cp->protocol);
|
|
if (pd && atomic_read(&pd->appcnt))
|
|
ip_vs_bind_app(cp, pd->pp);
|
|
}
|
|
return dest;
|
|
}
|
|
|
|
|
|
/*
|
|
* Unbind a connection entry with its VS destination
|
|
* Called by the ip_vs_conn_expire function.
|
|
*/
|
|
static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
|
|
{
|
|
struct ip_vs_dest *dest = cp->dest;
|
|
|
|
if (!dest)
|
|
return;
|
|
|
|
IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
|
|
"d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
|
|
"dest->refcnt:%d\n",
|
|
ip_vs_proto_name(cp->protocol),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
|
|
IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
|
|
ip_vs_fwd_tag(cp), cp->state,
|
|
cp->flags, atomic_read(&cp->refcnt),
|
|
atomic_read(&dest->refcnt));
|
|
|
|
/* Update the connection counters */
|
|
if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
|
|
/* It is a normal connection, so decrease the inactconns
|
|
or activeconns counter */
|
|
if (cp->flags & IP_VS_CONN_F_INACTIVE) {
|
|
atomic_dec(&dest->inactconns);
|
|
} else {
|
|
atomic_dec(&dest->activeconns);
|
|
}
|
|
} else {
|
|
/* It is a persistent connection/template, so decrease
|
|
the persistent connection counter */
|
|
atomic_dec(&dest->persistconns);
|
|
}
|
|
|
|
if (dest->l_threshold != 0) {
|
|
if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
|
|
dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
|
|
} else if (dest->u_threshold != 0) {
|
|
if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
|
|
dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
|
|
} else {
|
|
if (dest->flags & IP_VS_DEST_F_OVERLOAD)
|
|
dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
|
|
}
|
|
|
|
/*
|
|
* Simply decrease the refcnt of the dest, because the
|
|
* dest will be either in service's destination list
|
|
* or in the trash.
|
|
*/
|
|
atomic_dec(&dest->refcnt);
|
|
}
|
|
|
|
static int expire_quiescent_template(struct netns_ipvs *ipvs,
|
|
struct ip_vs_dest *dest)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
return ipvs->sysctl_expire_quiescent_template &&
|
|
(atomic_read(&dest->weight) == 0);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Checking if the destination of a connection template is available.
|
|
* If available, return 1, otherwise invalidate this connection
|
|
* template and return 0.
|
|
*/
|
|
int ip_vs_check_template(struct ip_vs_conn *ct)
|
|
{
|
|
struct ip_vs_dest *dest = ct->dest;
|
|
struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(ct));
|
|
|
|
/*
|
|
* Checking the dest server status.
|
|
*/
|
|
if ((dest == NULL) ||
|
|
!(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
|
|
expire_quiescent_template(ipvs, dest)) {
|
|
IP_VS_DBG_BUF(9, "check_template: dest not available for "
|
|
"protocol %s s:%s:%d v:%s:%d "
|
|
"-> d:%s:%d\n",
|
|
ip_vs_proto_name(ct->protocol),
|
|
IP_VS_DBG_ADDR(ct->af, &ct->caddr),
|
|
ntohs(ct->cport),
|
|
IP_VS_DBG_ADDR(ct->af, &ct->vaddr),
|
|
ntohs(ct->vport),
|
|
IP_VS_DBG_ADDR(ct->af, &ct->daddr),
|
|
ntohs(ct->dport));
|
|
|
|
/*
|
|
* Invalidate the connection template
|
|
*/
|
|
if (ct->vport != htons(0xffff)) {
|
|
if (ip_vs_conn_unhash(ct)) {
|
|
ct->dport = htons(0xffff);
|
|
ct->vport = htons(0xffff);
|
|
ct->cport = 0;
|
|
ip_vs_conn_hash(ct);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Simply decrease the refcnt of the template,
|
|
* don't restart its timer.
|
|
*/
|
|
atomic_dec(&ct->refcnt);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void ip_vs_conn_expire(unsigned long data)
|
|
{
|
|
struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
|
|
struct net *net = ip_vs_conn_net(cp);
|
|
struct netns_ipvs *ipvs = net_ipvs(net);
|
|
|
|
cp->timeout = 60*HZ;
|
|
|
|
/*
|
|
* hey, I'm using it
|
|
*/
|
|
atomic_inc(&cp->refcnt);
|
|
|
|
/*
|
|
* do I control anybody?
|
|
*/
|
|
if (atomic_read(&cp->n_control))
|
|
goto expire_later;
|
|
|
|
/*
|
|
* unhash it if it is hashed in the conn table
|
|
*/
|
|
if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET))
|
|
goto expire_later;
|
|
|
|
/*
|
|
* refcnt==1 implies I'm the only one referrer
|
|
*/
|
|
if (likely(atomic_read(&cp->refcnt) == 1)) {
|
|
/* delete the timer if it is activated by other users */
|
|
del_timer(&cp->timer);
|
|
|
|
/* does anybody control me? */
|
|
if (cp->control)
|
|
ip_vs_control_del(cp);
|
|
|
|
if (cp->flags & IP_VS_CONN_F_NFCT) {
|
|
ip_vs_conn_drop_conntrack(cp);
|
|
/* Do not access conntracks during subsys cleanup
|
|
* because nf_conntrack_find_get can not be used after
|
|
* conntrack cleanup for the net.
|
|
*/
|
|
smp_rmb();
|
|
if (ipvs->enable)
|
|
ip_vs_conn_drop_conntrack(cp);
|
|
}
|
|
|
|
ip_vs_pe_put(cp->pe);
|
|
kfree(cp->pe_data);
|
|
if (unlikely(cp->app != NULL))
|
|
ip_vs_unbind_app(cp);
|
|
ip_vs_unbind_dest(cp);
|
|
if (cp->flags & IP_VS_CONN_F_NO_CPORT)
|
|
atomic_dec(&ip_vs_conn_no_cport_cnt);
|
|
atomic_dec(&ipvs->conn_count);
|
|
|
|
kmem_cache_free(ip_vs_conn_cachep, cp);
|
|
return;
|
|
}
|
|
|
|
/* hash it back to the table */
|
|
ip_vs_conn_hash(cp);
|
|
|
|
expire_later:
|
|
IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
|
|
atomic_read(&cp->refcnt)-1,
|
|
atomic_read(&cp->n_control));
|
|
|
|
if (ipvs->sync_state & IP_VS_STATE_MASTER)
|
|
ip_vs_sync_conn(net, cp, sysctl_sync_threshold(ipvs));
|
|
|
|
ip_vs_conn_put(cp);
|
|
}
|
|
|
|
|
|
void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
|
|
{
|
|
if (del_timer(&cp->timer))
|
|
mod_timer(&cp->timer, jiffies);
|
|
}
|
|
|
|
|
|
/*
|
|
* Create a new connection entry and hash it into the ip_vs_conn_tab
|
|
*/
|
|
struct ip_vs_conn *
|
|
ip_vs_conn_new(const struct ip_vs_conn_param *p,
|
|
const union nf_inet_addr *daddr, __be16 dport, unsigned int flags,
|
|
struct ip_vs_dest *dest, __u32 fwmark)
|
|
{
|
|
struct ip_vs_conn *cp;
|
|
struct netns_ipvs *ipvs = net_ipvs(p->net);
|
|
struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
|
|
p->protocol);
|
|
|
|
cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
|
|
if (cp == NULL) {
|
|
IP_VS_ERR_RL("%s(): no memory\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
INIT_HLIST_NODE(&cp->c_list);
|
|
setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
|
|
ip_vs_conn_net_set(cp, p->net);
|
|
cp->af = p->af;
|
|
cp->protocol = p->protocol;
|
|
ip_vs_addr_copy(p->af, &cp->caddr, p->caddr);
|
|
cp->cport = p->cport;
|
|
ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr);
|
|
cp->vport = p->vport;
|
|
/* proto should only be IPPROTO_IP if d_addr is a fwmark */
|
|
ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
|
|
&cp->daddr, daddr);
|
|
cp->dport = dport;
|
|
cp->flags = flags;
|
|
cp->fwmark = fwmark;
|
|
if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) {
|
|
ip_vs_pe_get(p->pe);
|
|
cp->pe = p->pe;
|
|
cp->pe_data = p->pe_data;
|
|
cp->pe_data_len = p->pe_data_len;
|
|
}
|
|
spin_lock_init(&cp->lock);
|
|
|
|
/*
|
|
* Set the entry is referenced by the current thread before hashing
|
|
* it in the table, so that other thread run ip_vs_random_dropentry
|
|
* but cannot drop this entry.
|
|
*/
|
|
atomic_set(&cp->refcnt, 1);
|
|
|
|
atomic_set(&cp->n_control, 0);
|
|
atomic_set(&cp->in_pkts, 0);
|
|
|
|
atomic_inc(&ipvs->conn_count);
|
|
if (flags & IP_VS_CONN_F_NO_CPORT)
|
|
atomic_inc(&ip_vs_conn_no_cport_cnt);
|
|
|
|
/* Bind the connection with a destination server */
|
|
ip_vs_bind_dest(cp, dest);
|
|
|
|
/* Set its state and timeout */
|
|
cp->state = 0;
|
|
cp->timeout = 3*HZ;
|
|
cp->sync_endtime = jiffies & ~3UL;
|
|
|
|
/* Bind its packet transmitter */
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
if (p->af == AF_INET6)
|
|
ip_vs_bind_xmit_v6(cp);
|
|
else
|
|
#endif
|
|
ip_vs_bind_xmit(cp);
|
|
|
|
if (unlikely(pd && atomic_read(&pd->appcnt)))
|
|
ip_vs_bind_app(cp, pd->pp);
|
|
|
|
/*
|
|
* Allow conntrack to be preserved. By default, conntrack
|
|
* is created and destroyed for every packet.
|
|
* Sometimes keeping conntrack can be useful for
|
|
* IP_VS_CONN_F_ONE_PACKET too.
|
|
*/
|
|
|
|
if (ip_vs_conntrack_enabled(ipvs))
|
|
cp->flags |= IP_VS_CONN_F_NFCT;
|
|
|
|
/* Hash it in the ip_vs_conn_tab finally */
|
|
ip_vs_conn_hash(cp);
|
|
|
|
return cp;
|
|
}
|
|
|
|
/*
|
|
* /proc/net/ip_vs_conn entries
|
|
*/
|
|
#ifdef CONFIG_PROC_FS
|
|
struct ip_vs_iter_state {
|
|
struct seq_net_private p;
|
|
struct hlist_head *l;
|
|
};
|
|
|
|
static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
|
|
{
|
|
int idx;
|
|
struct ip_vs_conn *cp;
|
|
struct ip_vs_iter_state *iter = seq->private;
|
|
|
|
for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
|
|
ct_read_lock_bh(idx);
|
|
hlist_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
|
|
if (pos-- == 0) {
|
|
iter->l = &ip_vs_conn_tab[idx];
|
|
return cp;
|
|
}
|
|
}
|
|
ct_read_unlock_bh(idx);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct ip_vs_iter_state *iter = seq->private;
|
|
|
|
iter->l = NULL;
|
|
return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct ip_vs_conn *cp = v;
|
|
struct ip_vs_iter_state *iter = seq->private;
|
|
struct hlist_head *l = iter->l;
|
|
int idx;
|
|
|
|
++*pos;
|
|
if (v == SEQ_START_TOKEN)
|
|
return ip_vs_conn_array(seq, 0);
|
|
|
|
/* more on same hash chain? */
|
|
if (cp->c_list.next)
|
|
return hlist_entry(cp->c_list.next, struct ip_vs_conn, c_list);
|
|
|
|
idx = l - ip_vs_conn_tab;
|
|
ct_read_unlock_bh(idx);
|
|
|
|
while (++idx < ip_vs_conn_tab_size) {
|
|
ct_read_lock_bh(idx);
|
|
hlist_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
|
|
iter->l = &ip_vs_conn_tab[idx];
|
|
return cp;
|
|
}
|
|
ct_read_unlock_bh(idx);
|
|
}
|
|
iter->l = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
struct ip_vs_iter_state *iter = seq->private;
|
|
struct hlist_head *l = iter->l;
|
|
|
|
if (l)
|
|
ct_read_unlock_bh(l - ip_vs_conn_tab);
|
|
}
|
|
|
|
static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq,
|
|
"Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
|
|
else {
|
|
const struct ip_vs_conn *cp = v;
|
|
struct net *net = seq_file_net(seq);
|
|
char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
|
|
size_t len = 0;
|
|
|
|
if (!ip_vs_conn_net_eq(cp, net))
|
|
return 0;
|
|
if (cp->pe_data) {
|
|
pe_data[0] = ' ';
|
|
len = strlen(cp->pe->name);
|
|
memcpy(pe_data + 1, cp->pe->name, len);
|
|
pe_data[len + 1] = ' ';
|
|
len += 2;
|
|
len += cp->pe->show_pe_data(cp, pe_data + len);
|
|
}
|
|
pe_data[len] = '\0';
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
if (cp->af == AF_INET6)
|
|
seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
|
|
"%pI6 %04X %-11s %7lu%s\n",
|
|
ip_vs_proto_name(cp->protocol),
|
|
&cp->caddr.in6, ntohs(cp->cport),
|
|
&cp->vaddr.in6, ntohs(cp->vport),
|
|
&cp->daddr.in6, ntohs(cp->dport),
|
|
ip_vs_state_name(cp->protocol, cp->state),
|
|
(cp->timer.expires-jiffies)/HZ, pe_data);
|
|
else
|
|
#endif
|
|
seq_printf(seq,
|
|
"%-3s %08X %04X %08X %04X"
|
|
" %08X %04X %-11s %7lu%s\n",
|
|
ip_vs_proto_name(cp->protocol),
|
|
ntohl(cp->caddr.ip), ntohs(cp->cport),
|
|
ntohl(cp->vaddr.ip), ntohs(cp->vport),
|
|
ntohl(cp->daddr.ip), ntohs(cp->dport),
|
|
ip_vs_state_name(cp->protocol, cp->state),
|
|
(cp->timer.expires-jiffies)/HZ, pe_data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ip_vs_conn_seq_ops = {
|
|
.start = ip_vs_conn_seq_start,
|
|
.next = ip_vs_conn_seq_next,
|
|
.stop = ip_vs_conn_seq_stop,
|
|
.show = ip_vs_conn_seq_show,
|
|
};
|
|
|
|
static int ip_vs_conn_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &ip_vs_conn_seq_ops,
|
|
sizeof(struct ip_vs_iter_state));
|
|
}
|
|
|
|
static const struct file_operations ip_vs_conn_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ip_vs_conn_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
static const char *ip_vs_origin_name(unsigned int flags)
|
|
{
|
|
if (flags & IP_VS_CONN_F_SYNC)
|
|
return "SYNC";
|
|
else
|
|
return "LOCAL";
|
|
}
|
|
|
|
static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq,
|
|
"Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
|
|
else {
|
|
const struct ip_vs_conn *cp = v;
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
if (!ip_vs_conn_net_eq(cp, net))
|
|
return 0;
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
if (cp->af == AF_INET6)
|
|
seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
|
|
ip_vs_proto_name(cp->protocol),
|
|
&cp->caddr.in6, ntohs(cp->cport),
|
|
&cp->vaddr.in6, ntohs(cp->vport),
|
|
&cp->daddr.in6, ntohs(cp->dport),
|
|
ip_vs_state_name(cp->protocol, cp->state),
|
|
ip_vs_origin_name(cp->flags),
|
|
(cp->timer.expires-jiffies)/HZ);
|
|
else
|
|
#endif
|
|
seq_printf(seq,
|
|
"%-3s %08X %04X %08X %04X "
|
|
"%08X %04X %-11s %-6s %7lu\n",
|
|
ip_vs_proto_name(cp->protocol),
|
|
ntohl(cp->caddr.ip), ntohs(cp->cport),
|
|
ntohl(cp->vaddr.ip), ntohs(cp->vport),
|
|
ntohl(cp->daddr.ip), ntohs(cp->dport),
|
|
ip_vs_state_name(cp->protocol, cp->state),
|
|
ip_vs_origin_name(cp->flags),
|
|
(cp->timer.expires-jiffies)/HZ);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ip_vs_conn_sync_seq_ops = {
|
|
.start = ip_vs_conn_seq_start,
|
|
.next = ip_vs_conn_seq_next,
|
|
.stop = ip_vs_conn_seq_stop,
|
|
.show = ip_vs_conn_sync_seq_show,
|
|
};
|
|
|
|
static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops,
|
|
sizeof(struct ip_vs_iter_state));
|
|
}
|
|
|
|
static const struct file_operations ip_vs_conn_sync_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ip_vs_conn_sync_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Randomly drop connection entries before running out of memory
|
|
*/
|
|
static inline int todrop_entry(struct ip_vs_conn *cp)
|
|
{
|
|
/*
|
|
* The drop rate array needs tuning for real environments.
|
|
* Called from timer bh only => no locking
|
|
*/
|
|
static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
|
|
static char todrop_counter[9] = {0};
|
|
int i;
|
|
|
|
/* if the conn entry hasn't lasted for 60 seconds, don't drop it.
|
|
This will leave enough time for normal connection to get
|
|
through. */
|
|
if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
|
|
return 0;
|
|
|
|
/* Don't drop the entry if its number of incoming packets is not
|
|
located in [0, 8] */
|
|
i = atomic_read(&cp->in_pkts);
|
|
if (i > 8 || i < 0) return 0;
|
|
|
|
if (!todrop_rate[i]) return 0;
|
|
if (--todrop_counter[i] > 0) return 0;
|
|
|
|
todrop_counter[i] = todrop_rate[i];
|
|
return 1;
|
|
}
|
|
|
|
/* Called from keventd and must protect itself from softirqs */
|
|
void ip_vs_random_dropentry(struct net *net)
|
|
{
|
|
int idx;
|
|
struct ip_vs_conn *cp;
|
|
|
|
/*
|
|
* Randomly scan 1/32 of the whole table every second
|
|
*/
|
|
for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
|
|
unsigned int hash = net_random() & ip_vs_conn_tab_mask;
|
|
|
|
/*
|
|
* Lock is actually needed in this loop.
|
|
*/
|
|
ct_write_lock_bh(hash);
|
|
|
|
hlist_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
|
|
if (cp->flags & IP_VS_CONN_F_TEMPLATE)
|
|
/* connection template */
|
|
continue;
|
|
if (!ip_vs_conn_net_eq(cp, net))
|
|
continue;
|
|
if (cp->protocol == IPPROTO_TCP) {
|
|
switch(cp->state) {
|
|
case IP_VS_TCP_S_SYN_RECV:
|
|
case IP_VS_TCP_S_SYNACK:
|
|
break;
|
|
|
|
case IP_VS_TCP_S_ESTABLISHED:
|
|
if (todrop_entry(cp))
|
|
break;
|
|
continue;
|
|
|
|
default:
|
|
continue;
|
|
}
|
|
} else {
|
|
if (!todrop_entry(cp))
|
|
continue;
|
|
}
|
|
|
|
IP_VS_DBG(4, "del connection\n");
|
|
ip_vs_conn_expire_now(cp);
|
|
if (cp->control) {
|
|
IP_VS_DBG(4, "del conn template\n");
|
|
ip_vs_conn_expire_now(cp->control);
|
|
}
|
|
}
|
|
ct_write_unlock_bh(hash);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Flush all the connection entries in the ip_vs_conn_tab
|
|
*/
|
|
static void ip_vs_conn_flush(struct net *net)
|
|
{
|
|
int idx;
|
|
struct ip_vs_conn *cp;
|
|
struct netns_ipvs *ipvs = net_ipvs(net);
|
|
|
|
flush_again:
|
|
for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
|
|
/*
|
|
* Lock is actually needed in this loop.
|
|
*/
|
|
ct_write_lock_bh(idx);
|
|
|
|
hlist_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
|
|
if (!ip_vs_conn_net_eq(cp, net))
|
|
continue;
|
|
IP_VS_DBG(4, "del connection\n");
|
|
ip_vs_conn_expire_now(cp);
|
|
if (cp->control) {
|
|
IP_VS_DBG(4, "del conn template\n");
|
|
ip_vs_conn_expire_now(cp->control);
|
|
}
|
|
}
|
|
ct_write_unlock_bh(idx);
|
|
}
|
|
|
|
/* the counter may be not NULL, because maybe some conn entries
|
|
are run by slow timer handler or unhashed but still referred */
|
|
if (atomic_read(&ipvs->conn_count) != 0) {
|
|
schedule();
|
|
goto flush_again;
|
|
}
|
|
}
|
|
/*
|
|
* per netns init and exit
|
|
*/
|
|
int __net_init ip_vs_conn_net_init(struct net *net)
|
|
{
|
|
struct netns_ipvs *ipvs = net_ipvs(net);
|
|
|
|
atomic_set(&ipvs->conn_count, 0);
|
|
|
|
proc_create("ip_vs_conn", 0, net->proc_net, &ip_vs_conn_fops);
|
|
proc_create("ip_vs_conn_sync", 0, net->proc_net, &ip_vs_conn_sync_fops);
|
|
return 0;
|
|
}
|
|
|
|
void __net_exit ip_vs_conn_net_cleanup(struct net *net)
|
|
{
|
|
/* flush all the connection entries first */
|
|
ip_vs_conn_flush(net);
|
|
remove_proc_entry("ip_vs_conn", net->proc_net);
|
|
remove_proc_entry("ip_vs_conn_sync", net->proc_net);
|
|
}
|
|
|
|
int __init ip_vs_conn_init(void)
|
|
{
|
|
int idx;
|
|
|
|
/* Compute size and mask */
|
|
ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
|
|
ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1;
|
|
|
|
/*
|
|
* Allocate the connection hash table and initialize its list heads
|
|
*/
|
|
ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab));
|
|
if (!ip_vs_conn_tab)
|
|
return -ENOMEM;
|
|
|
|
/* Allocate ip_vs_conn slab cache */
|
|
ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
|
|
sizeof(struct ip_vs_conn), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ip_vs_conn_cachep) {
|
|
vfree(ip_vs_conn_tab);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pr_info("Connection hash table configured "
|
|
"(size=%d, memory=%ldKbytes)\n",
|
|
ip_vs_conn_tab_size,
|
|
(long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024);
|
|
IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
|
|
sizeof(struct ip_vs_conn));
|
|
|
|
for (idx = 0; idx < ip_vs_conn_tab_size; idx++)
|
|
INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]);
|
|
|
|
for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
|
|
rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
|
|
}
|
|
|
|
/* calculate the random value for connection hash */
|
|
get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ip_vs_conn_cleanup(void)
|
|
{
|
|
/* Release the empty cache */
|
|
kmem_cache_destroy(ip_vs_conn_cachep);
|
|
vfree(ip_vs_conn_tab);
|
|
}
|