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[NETFILTER] CLUSTERIP: introduce reference counting for entries 

The CLUSTERIP target creates a procfs entry for all different cluster
IPs.  Although more than one rules can refer to a single cluster IP (and
thus a single config structure), removal of the procfs entry is done
unconditionally in destroy(). In more complicated situations involving
deferred dereferencing of the config structure by procfs and creating a
new rule with the same cluster IP it's also possible that no entry will
be created for the new rule.

This patch fixes the problem by counting the number of entries
referencing a given config structure and moving the config list
manipulation and procfs entry deletion parts to the
clusterip_config_entry_put() function.

Signed-off-by: KOVACS Krisztian <hidden@balabit.hu>
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
KOVACS Krisztian 2005-09-16 16:59:46 -07:00 committed by David S. Miller
parent 1cbf07478b
commit 4451362445
1 changed files with 62 additions and 18 deletions
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80
net/ipv4/netfilter/ipt_CLUSTERIP.c
View File

@ -49,6 +49,8 @@ MODULE_DESCRIPTION("iptables target for CLUSTERIP");
struct clusterip_config {
struct list_head list; /* list of all configs */
atomic_t refcount; /* reference count */
atomic_t entries; /* number of entries/rules
* referencing us */
u_int32_t clusterip; /* the IP address */
u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
@ -76,23 +78,48 @@ static struct proc_dir_entry *clusterip_procdir;
#endif
static inline void
clusterip_config_get(struct clusterip_config *c) {
clusterip_config_get(struct clusterip_config *c)
{
atomic_inc(&c->refcount);
}
static inline void
clusterip_config_put(struct clusterip_config *c) {
if (atomic_dec_and_test(&c->refcount)) {
clusterip_config_put(struct clusterip_config *c)
{
if (atomic_dec_and_test(&c->refcount))
kfree(c);
}
/* increase the count of entries(rules) using/referencing this config */
static inline void
clusterip_config_entry_get(struct clusterip_config *c)
{
atomic_inc(&c->entries);
}
/* decrease the count of entries using/referencing this config. If last
* entry(rule) is removed, remove the config from lists, but don't free it
* yet, since proc-files could still be holding references */
static inline void
clusterip_config_entry_put(struct clusterip_config *c)
{
if (atomic_dec_and_test(&c->entries)) {
write_lock_bh(&clusterip_lock);
list_del(&c->list);
write_unlock_bh(&clusterip_lock);
dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
dev_put(c->dev);
kfree(c);
/* In case anyone still accesses the file, the open/close
* functions are also incrementing the refcount on their own,
* so it's safe to remove the entry even if it's in use. */
#ifdef CONFIG_PROC_FS
remove_proc_entry(c->pde->name, c->pde->parent);
#endif
}
}
static struct clusterip_config *
__clusterip_config_find(u_int32_t clusterip)
{
@ -111,7 +138,7 @@ __clusterip_config_find(u_int32_t clusterip)
}
static inline struct clusterip_config *
clusterip_config_find_get(u_int32_t clusterip)
clusterip_config_find_get(u_int32_t clusterip, int entry)
{
struct clusterip_config *c;
@ -122,6 +149,8 @@ clusterip_config_find_get(u_int32_t clusterip)
return NULL;
}
atomic_inc(&c->refcount);
if (entry)
atomic_inc(&c->entries);
read_unlock_bh(&clusterip_lock);
return c;
@ -148,6 +177,7 @@ clusterip_config_init(struct ipt_clusterip_tgt_info *i, u_int32_t ip,
c->hash_mode = i->hash_mode;
c->hash_initval = i->hash_initval;
atomic_set(&c->refcount, 1);
atomic_set(&c->entries, 1);
#ifdef CONFIG_PROC_FS
/* create proc dir entry */
@ -415,8 +445,26 @@ checkentry(const char *tablename,
/* FIXME: further sanity checks */
config = clusterip_config_find_get(e->ip.dst.s_addr);
if (!config) {
config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
if (config) {
if (cipinfo->config != NULL) {
/* Case A: This is an entry that gets reloaded, since
* it still has a cipinfo->config pointer. Simply
* increase the entry refcount and return */
if (cipinfo->config != config) {
printk(KERN_ERR "CLUSTERIP: Reloaded entry "
"has invalid config pointer!\n");
return 0;
}
clusterip_config_entry_get(cipinfo->config);
} else {
/* Case B: This is a new rule referring to an existing
* clusterip config. */
cipinfo->config = config;
clusterip_config_entry_get(cipinfo->config);
}
} else {
/* Case C: This is a completely new clusterip config */
if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
return 0;
@ -443,10 +491,9 @@ checkentry(const char *tablename,
}
dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
}
cipinfo->config = config;
}
cipinfo->config = config;
return 1;
}
@ -455,13 +502,10 @@ static void destroy(void *matchinfo, unsigned int matchinfosize)
{
struct ipt_clusterip_tgt_info *cipinfo = matchinfo;
/* we first remove the proc entry and then drop the reference
* count. In case anyone still accesses the file, the open/close
* functions are also incrementing the refcount on their own */
#ifdef CONFIG_PROC_FS
remove_proc_entry(cipinfo->config->pde->name,
cipinfo->config->pde->parent);
#endif
/* if no more entries are referencing the config, remove it
* from the list and destroy the proc entry */
clusterip_config_entry_put(cipinfo->config);
clusterip_config_put(cipinfo->config);
}
@ -533,7 +577,7 @@ arp_mangle(unsigned int hook,
/* if there is no clusterip configuration for the arp reply's
* source ip, we don't want to mangle it */
c = clusterip_config_find_get(payload->src_ip);
c = clusterip_config_find_get(payload->src_ip, 0);
if (!c)
return NF_ACCEPT;