// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
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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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* 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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#define KMSG_COMPONENT "IPVS"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
#include <linux/interrupt.h>
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#include <linux/in.h>
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#include <linux/inet.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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|
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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");
|
|
/* 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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* Connection hash table: for input and output packets lookups of IPVS
|
*/
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static struct hlist_head *ip_vs_conn_tab __read_mostly;
|
|
/* SLAB cache for IPVS connections */
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static struct kmem_cache *ip_vs_conn_cachep __read_mostly;
|
|
/* counter for no client port connections */
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static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0);
|
|
/* random value for IPVS connection hash */
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static unsigned int ip_vs_conn_rnd __read_mostly;
|
|
/*
|
* Fine locking granularity for big connection hash table
|
*/
|
#define CT_LOCKARRAY_BITS 5
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#define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
|
#define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
|
|
/* We need an addrstrlen that works with or without v6 */
|
#ifdef CONFIG_IP_VS_IPV6
|
#define IP_VS_ADDRSTRLEN INET6_ADDRSTRLEN
|
#else
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#define IP_VS_ADDRSTRLEN (8+1)
|
#endif
|
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struct ip_vs_aligned_lock
|
{
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spinlock_t l;
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} __attribute__((__aligned__(SMP_CACHE_BYTES)));
|
|
/* 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_write_lock_bh(unsigned int key)
|
{
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spin_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
|
}
|
|
static inline void ct_write_unlock_bh(unsigned int key)
|
{
|
spin_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
|
}
|
|
static void ip_vs_conn_expire(struct timer_list *t);
|
|
/*
|
* Returns hash value for IPVS connection entry
|
*/
|
static unsigned int ip_vs_conn_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto,
|
const union nf_inet_addr *addr,
|
__be16 port)
|
{
|
#ifdef CONFIG_IP_VS_IPV6
|
if (af == AF_INET6)
|
return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd),
|
(__force u32)port, proto, ip_vs_conn_rnd) ^
|
((size_t)ipvs>>8)) & ip_vs_conn_tab_mask;
|
#endif
|
return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto,
|
ip_vs_conn_rnd) ^
|
((size_t)ipvs>>8)) & ip_vs_conn_tab_mask;
|
}
|
|
static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p,
|
bool inverse)
|
{
|
const union nf_inet_addr *addr;
|
__be16 port;
|
|
if (p->pe_data && p->pe->hashkey_raw)
|
return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) &
|
ip_vs_conn_tab_mask;
|
|
if (likely(!inverse)) {
|
addr = p->caddr;
|
port = p->cport;
|
} else {
|
addr = p->vaddr;
|
port = p->vport;
|
}
|
|
return ip_vs_conn_hashkey(p->ipvs, p->af, p->protocol, addr, port);
|
}
|
|
static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp)
|
{
|
struct ip_vs_conn_param p;
|
|
ip_vs_conn_fill_param(cp->ipvs, cp->af, cp->protocol,
|
&cp->caddr, cp->cport, NULL, 0, &p);
|
|
if (cp->pe) {
|
p.pe = cp->pe;
|
p.pe_data = cp->pe_data;
|
p.pe_data_len = cp->pe_data_len;
|
}
|
|
return ip_vs_conn_hashkey_param(&p, false);
|
}
|
|
/*
|
* Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port.
|
* returns bool success.
|
*/
|
static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
|
{
|
unsigned int hash;
|
int ret;
|
|
if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
|
return 0;
|
|
/* Hash by protocol, client address and port */
|
hash = ip_vs_conn_hashkey_conn(cp);
|
|
ct_write_lock_bh(hash);
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spin_lock(&cp->lock);
|
|
if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
|
cp->flags |= IP_VS_CONN_F_HASHED;
|
refcount_inc(&cp->refcnt);
|
hlist_add_head_rcu(&cp->c_list, &ip_vs_conn_tab[hash]);
|
ret = 1;
|
} else {
|
pr_err("%s(): request for already hashed, called from %pS\n",
|
__func__, __builtin_return_address(0));
|
ret = 0;
|
}
|
|
spin_unlock(&cp->lock);
|
ct_write_unlock_bh(hash);
|
|
return ret;
|
}
|
|
|
/*
|
* UNhashes ip_vs_conn from ip_vs_conn_tab.
|
* returns bool success. Caller should hold conn reference.
|
*/
|
static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
|
{
|
unsigned int hash;
|
int ret;
|
|
/* unhash it and decrease its reference counter */
|
hash = ip_vs_conn_hashkey_conn(cp);
|
|
ct_write_lock_bh(hash);
|
spin_lock(&cp->lock);
|
|
if (cp->flags & IP_VS_CONN_F_HASHED) {
|
hlist_del_rcu(&cp->c_list);
|
cp->flags &= ~IP_VS_CONN_F_HASHED;
|
refcount_dec(&cp->refcnt);
|
ret = 1;
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} else
|
ret = 0;
|
|
spin_unlock(&cp->lock);
|
ct_write_unlock_bh(hash);
|
|
return ret;
|
}
|
|
/* Try to unlink ip_vs_conn from ip_vs_conn_tab.
|
* returns bool success.
|
*/
|
static inline bool ip_vs_conn_unlink(struct ip_vs_conn *cp)
|
{
|
unsigned int hash;
|
bool ret = false;
|
|
if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
|
return refcount_dec_if_one(&cp->refcnt);
|
|
hash = ip_vs_conn_hashkey_conn(cp);
|
|
ct_write_lock_bh(hash);
|
spin_lock(&cp->lock);
|
|
if (cp->flags & IP_VS_CONN_F_HASHED) {
|
/* Decrease refcnt and unlink conn only if we are last user */
|
if (refcount_dec_if_one(&cp->refcnt)) {
|
hlist_del_rcu(&cp->c_list);
|
cp->flags &= ~IP_VS_CONN_F_HASHED;
|
ret = true;
|
}
|
}
|
|
spin_unlock(&cp->lock);
|
ct_write_unlock_bh(hash);
|
|
return ret;
|
}
|
|
|
/*
|
* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
|
* Called for pkts coming from OUTside-to-INside.
|
* p->caddr, p->cport: pkt source address (foreign host)
|
* p->vaddr, p->vport: pkt dest address (load balancer)
|
*/
|
static inline struct ip_vs_conn *
|
__ip_vs_conn_in_get(const struct ip_vs_conn_param *p)
|
{
|
unsigned int hash;
|
struct ip_vs_conn *cp;
|
|
hash = ip_vs_conn_hashkey_param(p, false);
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
|
if (p->cport == cp->cport && p->vport == cp->vport &&
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cp->af == p->af &&
|
ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
|
ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) &&
|
((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
|
p->protocol == cp->protocol &&
|
cp->ipvs == p->ipvs) {
|
if (!__ip_vs_conn_get(cp))
|
continue;
|
/* HIT */
|
rcu_read_unlock();
|
return cp;
|
}
|
}
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|
rcu_read_unlock();
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|
return NULL;
|
}
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|
struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p)
|
{
|
struct ip_vs_conn *cp;
|
|
cp = __ip_vs_conn_in_get(p);
|
if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) {
|
struct ip_vs_conn_param cport_zero_p = *p;
|
cport_zero_p.cport = 0;
|
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",
|
ip_vs_proto_name(p->protocol),
|
IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
|
IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
|
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(struct netns_ipvs *ipvs,
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int af, const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph,
|
struct ip_vs_conn_param *p)
|
{
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__be16 _ports[2], *pptr;
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|
pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
|
if (pptr == NULL)
|
return 1;
|
|
if (likely(!ip_vs_iph_inverse(iph)))
|
ip_vs_conn_fill_param(ipvs, af, iph->protocol, &iph->saddr,
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pptr[0], &iph->daddr, pptr[1], p);
|
else
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ip_vs_conn_fill_param(ipvs, af, iph->protocol, &iph->daddr,
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pptr[1], &iph->saddr, pptr[0], p);
|
return 0;
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}
|
|
struct ip_vs_conn *
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ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
|
const struct sk_buff *skb,
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const struct ip_vs_iphdr *iph)
|
{
|
struct ip_vs_conn_param p;
|
|
if (ip_vs_conn_fill_param_proto(ipvs, af, skb, iph, &p))
|
return NULL;
|
|
return ip_vs_conn_in_get(&p);
|
}
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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)
|
{
|
unsigned int hash;
|
struct ip_vs_conn *cp;
|
|
hash = ip_vs_conn_hashkey_param(p, false);
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
|
if (unlikely(p->pe_data && p->pe->ct_match)) {
|
if (cp->ipvs != p->ipvs)
|
continue;
|
if (p->pe == cp->pe && p->pe->ct_match(p, cp)) {
|
if (__ip_vs_conn_get(cp))
|
goto out;
|
}
|
continue;
|
}
|
|
if (cp->af == p->af &&
|
ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
|
/* protocol should only be IPPROTO_IP if
|
* p->vaddr is a fwmark */
|
ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC :
|
p->af, p->vaddr, &cp->vaddr) &&
|
p->vport == cp->vport && p->cport == cp->cport &&
|
cp->flags & IP_VS_CONN_F_TEMPLATE &&
|
p->protocol == cp->protocol &&
|
cp->ipvs == p->ipvs) {
|
if (__ip_vs_conn_get(cp))
|
goto out;
|
}
|
}
|
cp = NULL;
|
|
out:
|
rcu_read_unlock();
|
|
IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
|
ip_vs_proto_name(p->protocol),
|
IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
|
IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
|
cp ? "hit" : "not hit");
|
|
return cp;
|
}
|
|
/* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
|
* Called for pkts coming from inside-to-OUTside.
|
* p->caddr, p->cport: pkt source address (inside host)
|
* p->vaddr, p->vport: pkt dest address (foreign host) */
|
struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p)
|
{
|
unsigned int hash;
|
struct ip_vs_conn *cp, *ret=NULL;
|
const union nf_inet_addr *saddr;
|
__be16 sport;
|
|
/*
|
* Check for "full" addressed entries
|
*/
|
hash = ip_vs_conn_hashkey_param(p, true);
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
|
if (p->vport != cp->cport)
|
continue;
|
|
if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
|
sport = cp->vport;
|
saddr = &cp->vaddr;
|
} else {
|
sport = cp->dport;
|
saddr = &cp->daddr;
|
}
|
|
if (p->cport == sport && cp->af == p->af &&
|
ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) &&
|
ip_vs_addr_equal(p->af, p->caddr, saddr) &&
|
p->protocol == cp->protocol &&
|
cp->ipvs == p->ipvs) {
|
if (!__ip_vs_conn_get(cp))
|
continue;
|
/* HIT */
|
ret = cp;
|
break;
|
}
|
}
|
|
rcu_read_unlock();
|
|
IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
|
ip_vs_proto_name(p->protocol),
|
IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
|
IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
|
ret ? "hit" : "not hit");
|
|
return ret;
|
}
|
|
struct ip_vs_conn *
|
ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
|
const struct sk_buff *skb,
|
const struct ip_vs_iphdr *iph)
|
{
|
struct ip_vs_conn_param p;
|
|
if (ip_vs_conn_fill_param_proto(ipvs, af, skb, iph, &p))
|
return NULL;
|
|
return ip_vs_conn_out_get(&p);
|
}
|
EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto);
|
|
/*
|
* Put back the conn and restart its timer with its timeout
|
*/
|
static void __ip_vs_conn_put_timer(struct ip_vs_conn *cp)
|
{
|
unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
|
0 : cp->timeout;
|
mod_timer(&cp->timer, jiffies+t);
|
|
__ip_vs_conn_put(cp);
|
}
|
|
void ip_vs_conn_put(struct ip_vs_conn *cp)
|
{
|
if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) &&
|
(refcount_read(&cp->refcnt) == 1) &&
|
!timer_pending(&cp->timer))
|
/* expire connection immediately */
|
ip_vs_conn_expire(&cp->timer);
|
else
|
__ip_vs_conn_put_timer(cp);
|
}
|
|
/*
|
* Fill a no_client_port connection with a client port number
|
*/
|
void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
|
{
|
if (ip_vs_conn_unhash(cp)) {
|
spin_lock_bh(&cp->lock);
|
if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
|
atomic_dec(&ip_vs_conn_no_cport_cnt);
|
cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
|
cp->cport = cport;
|
}
|
spin_unlock_bh(&cp->lock);
|
|
/* hash on new dport */
|
ip_vs_conn_hash(cp);
|
}
|
}
|
|
|
/*
|
* 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;
|
break;
|
|
case IP_VS_CONN_F_TUNNEL:
|
#ifdef CONFIG_IP_VS_IPV6
|
if (cp->daf == AF_INET6)
|
cp->packet_xmit = ip_vs_tunnel_xmit_v6;
|
else
|
#endif
|
cp->packet_xmit = ip_vs_tunnel_xmit;
|
break;
|
|
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:
|
if (cp->daf == AF_INET6)
|
cp->packet_xmit = ip_vs_tunnel_xmit_v6;
|
else
|
cp->packet_xmit = ip_vs_tunnel_xmit;
|
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 */
|
ip_vs_dest_hold(dest);
|
|
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->daf, &cp->daddr), ntohs(cp->dport),
|
ip_vs_fwd_tag(cp), cp->state,
|
cp->flags, refcount_read(&cp->refcnt),
|
refcount_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.
|
*/
|
void ip_vs_try_bind_dest(struct ip_vs_conn *cp)
|
{
|
struct ip_vs_dest *dest;
|
|
rcu_read_lock();
|
|
/* This function is only invoked by the synchronization code. We do
|
* not currently support heterogeneous pools with synchronization,
|
* so we can make the assumption that the svc_af is the same as the
|
* dest_af
|
*/
|
dest = ip_vs_find_dest(cp->ipvs, cp->af, 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_bh(&cp->lock);
|
if (cp->dest) {
|
spin_unlock_bh(&cp->lock);
|
rcu_read_unlock();
|
return;
|
}
|
|
/* 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_bh(&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(cp->ipvs, cp->protocol);
|
if (pd && atomic_read(&pd->appcnt))
|
ip_vs_bind_app(cp, pd->pp);
|
}
|
rcu_read_unlock();
|
}
|
|
|
/*
|
* 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->daf, &cp->daddr), ntohs(cp->dport),
|
ip_vs_fwd_tag(cp), cp->state,
|
cp->flags, refcount_read(&cp->refcnt),
|
refcount_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;
|
}
|
|
ip_vs_dest_put(dest);
|
}
|
|
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 *cdest)
|
{
|
struct ip_vs_dest *dest = ct->dest;
|
struct netns_ipvs *ipvs = ct->ipvs;
|
|
/*
|
* Checking the dest server status.
|
*/
|
if ((dest == NULL) ||
|
!(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
|
expire_quiescent_template(ipvs, dest) ||
|
(cdest && (dest != cdest))) {
|
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->daf, &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.
|
*/
|
__ip_vs_conn_put(ct);
|
return 0;
|
}
|
return 1;
|
}
|
|
static void ip_vs_conn_rcu_free(struct rcu_head *head)
|
{
|
struct ip_vs_conn *cp = container_of(head, struct ip_vs_conn,
|
rcu_head);
|
|
ip_vs_pe_put(cp->pe);
|
kfree(cp->pe_data);
|
kmem_cache_free(ip_vs_conn_cachep, cp);
|
}
|
|
/* Try to delete connection while not holding reference */
|
static void ip_vs_conn_del(struct ip_vs_conn *cp)
|
{
|
if (del_timer(&cp->timer)) {
|
/* Drop cp->control chain too */
|
if (cp->control)
|
cp->timeout = 0;
|
ip_vs_conn_expire(&cp->timer);
|
}
|
}
|
|
/* Try to delete connection while holding reference */
|
static void ip_vs_conn_del_put(struct ip_vs_conn *cp)
|
{
|
if (del_timer(&cp->timer)) {
|
/* Drop cp->control chain too */
|
if (cp->control)
|
cp->timeout = 0;
|
__ip_vs_conn_put(cp);
|
ip_vs_conn_expire(&cp->timer);
|
} else {
|
__ip_vs_conn_put(cp);
|
}
|
}
|
|
static void ip_vs_conn_expire(struct timer_list *t)
|
{
|
struct ip_vs_conn *cp = from_timer(cp, t, timer);
|
struct netns_ipvs *ipvs = cp->ipvs;
|
|
/*
|
* do I control anybody?
|
*/
|
if (atomic_read(&cp->n_control))
|
goto expire_later;
|
|
/* Unlink conn if not referenced anymore */
|
if (likely(ip_vs_conn_unlink(cp))) {
|
struct ip_vs_conn *ct = cp->control;
|
|
/* delete the timer if it is activated by other users */
|
del_timer(&cp->timer);
|
|
/* does anybody control me? */
|
if (ct) {
|
bool has_ref = !cp->timeout && __ip_vs_conn_get(ct);
|
|
ip_vs_control_del(cp);
|
/* Drop CTL or non-assured TPL if not used anymore */
|
if (has_ref && !atomic_read(&ct->n_control) &&
|
(!(ct->flags & IP_VS_CONN_F_TEMPLATE) ||
|
!(ct->state & IP_VS_CTPL_S_ASSURED))) {
|
IP_VS_DBG(4, "drop controlling connection\n");
|
ip_vs_conn_del_put(ct);
|
} else if (has_ref) {
|
__ip_vs_conn_put(ct);
|
}
|
}
|
|
if ((cp->flags & IP_VS_CONN_F_NFCT) &&
|
!(cp->flags & IP_VS_CONN_F_ONE_PACKET)) {
|
/* 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);
|
}
|
|
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);
|
if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
|
ip_vs_conn_rcu_free(&cp->rcu_head);
|
else
|
call_rcu(&cp->rcu_head, ip_vs_conn_rcu_free);
|
atomic_dec(&ipvs->conn_count);
|
return;
|
}
|
|
expire_later:
|
IP_VS_DBG(7, "delayed: conn->refcnt=%d conn->n_control=%d\n",
|
refcount_read(&cp->refcnt),
|
atomic_read(&cp->n_control));
|
|
refcount_inc(&cp->refcnt);
|
cp->timeout = 60*HZ;
|
|
if (ipvs->sync_state & IP_VS_STATE_MASTER)
|
ip_vs_sync_conn(ipvs, cp, sysctl_sync_threshold(ipvs));
|
|
__ip_vs_conn_put_timer(cp);
|
}
|
|
/* Modify timer, so that it expires as soon as possible.
|
* Can be called without reference only if under RCU lock.
|
* We can have such chain of conns linked with ->control: DATA->CTL->TPL
|
* - DATA (eg. FTP) and TPL (persistence) can be present depending on setup
|
* - cp->timeout=0 indicates all conns from chain should be dropped but
|
* TPL is not dropped if in assured state
|
*/
|
void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
|
{
|
/* Using mod_timer_pending will ensure the timer is not
|
* modified after the final del_timer in ip_vs_conn_expire.
|
*/
|
if (timer_pending(&cp->timer) &&
|
time_after(cp->timer.expires, jiffies))
|
mod_timer_pending(&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, int dest_af,
|
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 = p->ipvs;
|
struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->ipvs,
|
p->protocol);
|
|
cp = kmem_cache_alloc(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);
|
timer_setup(&cp->timer, ip_vs_conn_expire, 0);
|
cp->ipvs = ipvs;
|
cp->af = p->af;
|
cp->daf = dest_af;
|
cp->protocol = p->protocol;
|
ip_vs_addr_set(p->af, &cp->caddr, p->caddr);
|
cp->cport = p->cport;
|
/* proto should only be IPPROTO_IP if p->vaddr is a fwmark */
|
ip_vs_addr_set(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
|
&cp->vaddr, p->vaddr);
|
cp->vport = p->vport;
|
ip_vs_addr_set(cp->daf, &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;
|
} else {
|
cp->pe = NULL;
|
cp->pe_data = NULL;
|
cp->pe_data_len = 0;
|
}
|
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.
|
*/
|
refcount_set(&cp->refcnt, 1);
|
|
cp->control = NULL;
|
atomic_set(&cp->n_control, 0);
|
atomic_set(&cp->in_pkts, 0);
|
|
cp->packet_xmit = NULL;
|
cp->app = NULL;
|
cp->app_data = NULL;
|
/* reset struct ip_vs_seq */
|
cp->in_seq.delta = 0;
|
cp->out_seq.delta = 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 */
|
cp->dest = NULL;
|
ip_vs_bind_dest(cp, dest);
|
|
/* Set its state and timeout */
|
cp->state = 0;
|
cp->old_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++) {
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
|
/* __ip_vs_conn_get() is not needed by
|
* ip_vs_conn_seq_show and ip_vs_conn_sync_seq_show
|
*/
|
if (pos-- == 0) {
|
iter->l = &ip_vs_conn_tab[idx];
|
return cp;
|
}
|
}
|
cond_resched_rcu();
|
}
|
|
return NULL;
|
}
|
|
static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
|
__acquires(RCU)
|
{
|
struct ip_vs_iter_state *iter = seq->private;
|
|
iter->l = NULL;
|
rcu_read_lock();
|
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_node *e;
|
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? */
|
e = rcu_dereference(hlist_next_rcu(&cp->c_list));
|
if (e)
|
return hlist_entry(e, struct ip_vs_conn, c_list);
|
|
idx = l - ip_vs_conn_tab;
|
while (++idx < ip_vs_conn_tab_size) {
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
|
iter->l = &ip_vs_conn_tab[idx];
|
return cp;
|
}
|
cond_resched_rcu();
|
}
|
iter->l = NULL;
|
return NULL;
|
}
|
|
static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
|
__releases(RCU)
|
{
|
rcu_read_unlock();
|
}
|
|
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;
|
char dbuf[IP_VS_ADDRSTRLEN];
|
|
if (!net_eq(cp->ipvs->net, 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->daf == AF_INET6)
|
snprintf(dbuf, sizeof(dbuf), "%pI6", &cp->daddr.in6);
|
else
|
#endif
|
snprintf(dbuf, sizeof(dbuf), "%08X",
|
ntohl(cp->daddr.ip));
|
|
#ifdef CONFIG_IP_VS_IPV6
|
if (cp->af == AF_INET6)
|
seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
|
"%s %04X %-11s %7u%s\n",
|
ip_vs_proto_name(cp->protocol),
|
&cp->caddr.in6, ntohs(cp->cport),
|
&cp->vaddr.in6, ntohs(cp->vport),
|
dbuf, ntohs(cp->dport),
|
ip_vs_state_name(cp),
|
jiffies_delta_to_msecs(cp->timer.expires -
|
jiffies) / 1000,
|
pe_data);
|
else
|
#endif
|
seq_printf(seq,
|
"%-3s %08X %04X %08X %04X"
|
" %s %04X %-11s %7u%s\n",
|
ip_vs_proto_name(cp->protocol),
|
ntohl(cp->caddr.ip), ntohs(cp->cport),
|
ntohl(cp->vaddr.ip), ntohs(cp->vport),
|
dbuf, ntohs(cp->dport),
|
ip_vs_state_name(cp),
|
jiffies_delta_to_msecs(cp->timer.expires -
|
jiffies) / 1000,
|
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 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)
|
{
|
char dbuf[IP_VS_ADDRSTRLEN];
|
|
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 (!net_eq(cp->ipvs->net, net))
|
return 0;
|
|
#ifdef CONFIG_IP_VS_IPV6
|
if (cp->daf == AF_INET6)
|
snprintf(dbuf, sizeof(dbuf), "%pI6", &cp->daddr.in6);
|
else
|
#endif
|
snprintf(dbuf, sizeof(dbuf), "%08X",
|
ntohl(cp->daddr.ip));
|
|
#ifdef CONFIG_IP_VS_IPV6
|
if (cp->af == AF_INET6)
|
seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
|
"%s %04X %-11s %-6s %7u\n",
|
ip_vs_proto_name(cp->protocol),
|
&cp->caddr.in6, ntohs(cp->cport),
|
&cp->vaddr.in6, ntohs(cp->vport),
|
dbuf, ntohs(cp->dport),
|
ip_vs_state_name(cp),
|
ip_vs_origin_name(cp->flags),
|
jiffies_delta_to_msecs(cp->timer.expires -
|
jiffies) / 1000);
|
else
|
#endif
|
seq_printf(seq,
|
"%-3s %08X %04X %08X %04X "
|
"%s %04X %-11s %-6s %7u\n",
|
ip_vs_proto_name(cp->protocol),
|
ntohl(cp->caddr.ip), ntohs(cp->cport),
|
ntohl(cp->vaddr.ip), ntohs(cp->vport),
|
dbuf, ntohs(cp->dport),
|
ip_vs_state_name(cp),
|
ip_vs_origin_name(cp->flags),
|
jiffies_delta_to_msecs(cp->timer.expires -
|
jiffies) / 1000);
|
}
|
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,
|
};
|
#endif
|
|
|
/* Randomly drop connection entries before running out of memory
|
* Can be used for DATA and CTL conns. For TPL conns there are exceptions:
|
* - traffic for services in OPS mode increases ct->in_pkts, so it is supported
|
* - traffic for services not in OPS mode does not increase ct->in_pkts in
|
* all cases, so it is not supported
|
*/
|
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 signed char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
|
static signed 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;
|
}
|
|
static inline bool ip_vs_conn_ops_mode(struct ip_vs_conn *cp)
|
{
|
struct ip_vs_service *svc;
|
|
if (!cp->dest)
|
return false;
|
svc = rcu_dereference(cp->dest->svc);
|
return svc && (svc->flags & IP_VS_SVC_F_ONEPACKET);
|
}
|
|
/* Called from keventd and must protect itself from softirqs */
|
void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
|
{
|
int idx;
|
struct ip_vs_conn *cp;
|
|
rcu_read_lock();
|
/*
|
* Randomly scan 1/32 of the whole table every second
|
*/
|
for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
|
unsigned int hash = prandom_u32() & ip_vs_conn_tab_mask;
|
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
|
if (cp->ipvs != ipvs)
|
continue;
|
if (atomic_read(&cp->n_control))
|
continue;
|
if (cp->flags & IP_VS_CONN_F_TEMPLATE) {
|
/* connection template of OPS */
|
if (ip_vs_conn_ops_mode(cp))
|
goto try_drop;
|
if (!(cp->state & IP_VS_CTPL_S_ASSURED))
|
goto drop;
|
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 (cp->protocol == IPPROTO_SCTP) {
|
switch (cp->state) {
|
case IP_VS_SCTP_S_INIT1:
|
case IP_VS_SCTP_S_INIT:
|
break;
|
case IP_VS_SCTP_S_ESTABLISHED:
|
if (todrop_entry(cp))
|
break;
|
continue;
|
default:
|
continue;
|
}
|
} else {
|
try_drop:
|
if (!todrop_entry(cp))
|
continue;
|
}
|
|
drop:
|
IP_VS_DBG(4, "drop connection\n");
|
ip_vs_conn_del(cp);
|
}
|
cond_resched_rcu();
|
}
|
rcu_read_unlock();
|
}
|
|
|
/*
|
* Flush all the connection entries in the ip_vs_conn_tab
|
*/
|
static void ip_vs_conn_flush(struct netns_ipvs *ipvs)
|
{
|
int idx;
|
struct ip_vs_conn *cp, *cp_c;
|
|
flush_again:
|
rcu_read_lock();
|
for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
|
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
|
if (cp->ipvs != ipvs)
|
continue;
|
if (atomic_read(&cp->n_control))
|
continue;
|
cp_c = cp->control;
|
IP_VS_DBG(4, "del connection\n");
|
ip_vs_conn_del(cp);
|
if (cp_c && !atomic_read(&cp_c->n_control)) {
|
IP_VS_DBG(4, "del controlling connection\n");
|
ip_vs_conn_del(cp_c);
|
}
|
}
|
cond_resched_rcu();
|
}
|
rcu_read_unlock();
|
|
/* 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;
|
}
|
}
|
|
#ifdef CONFIG_SYSCTL
|
void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs)
|
{
|
int idx;
|
struct ip_vs_conn *cp, *cp_c;
|
struct ip_vs_dest *dest;
|
|
rcu_read_lock();
|
for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
|
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
|
if (cp->ipvs != ipvs)
|
continue;
|
|
dest = cp->dest;
|
if (!dest || (dest->flags & IP_VS_DEST_F_AVAILABLE))
|
continue;
|
|
if (atomic_read(&cp->n_control))
|
continue;
|
|
cp_c = cp->control;
|
IP_VS_DBG(4, "del connection\n");
|
ip_vs_conn_del(cp);
|
if (cp_c && !atomic_read(&cp_c->n_control)) {
|
IP_VS_DBG(4, "del controlling connection\n");
|
ip_vs_conn_del(cp_c);
|
}
|
}
|
cond_resched_rcu();
|
|
/* netns clean up started, abort delayed work */
|
if (!ipvs->enable)
|
break;
|
}
|
rcu_read_unlock();
|
}
|
#endif
|
|
/*
|
* per netns init and exit
|
*/
|
int __net_init ip_vs_conn_net_init(struct netns_ipvs *ipvs)
|
{
|
atomic_set(&ipvs->conn_count, 0);
|
|
#ifdef CONFIG_PROC_FS
|
if (!proc_create_net("ip_vs_conn", 0, ipvs->net->proc_net,
|
&ip_vs_conn_seq_ops,
|
sizeof(struct ip_vs_iter_state)))
|
goto err_conn;
|
|
if (!proc_create_net("ip_vs_conn_sync", 0, ipvs->net->proc_net,
|
&ip_vs_conn_sync_seq_ops,
|
sizeof(struct ip_vs_iter_state)))
|
goto err_conn_sync;
|
#endif
|
|
return 0;
|
|
#ifdef CONFIG_PROC_FS
|
err_conn_sync:
|
remove_proc_entry("ip_vs_conn", ipvs->net->proc_net);
|
err_conn:
|
return -ENOMEM;
|
#endif
|
}
|
|
void __net_exit ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs)
|
{
|
/* flush all the connection entries first */
|
ip_vs_conn_flush(ipvs);
|
#ifdef CONFIG_PROC_FS
|
remove_proc_entry("ip_vs_conn", ipvs->net->proc_net);
|
remove_proc_entry("ip_vs_conn_sync", ipvs->net->proc_net);
|
#endif
|
}
|
|
int __init ip_vs_conn_init(void)
|
{
|
int idx;
|
|
/* Compute size and mask */
|
if (ip_vs_conn_tab_bits < 8 || ip_vs_conn_tab_bits > 20) {
|
pr_info("conn_tab_bits not in [8, 20]. Using default value\n");
|
ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS;
|
}
|
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(array_size(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(*ip_vs_conn_tab))/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++) {
|
spin_lock_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)
|
{
|
/* Wait all ip_vs_conn_rcu_free() callbacks to complete */
|
rcu_barrier();
|
/* Release the empty cache */
|
kmem_cache_destroy(ip_vs_conn_cachep);
|
vfree(ip_vs_conn_tab);
|
}
|
