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netfilter: don't use mutex_lock_interruptible() 

Eric Dumazet reports that getsockopt() or setsockopt() sometimes
returns -EINTR instead of -ENOPROTOOPT, causing headaches to
application developers.

This patch replaces all the mutex_lock_interruptible() by mutex_lock()
in the netfilter tree, as there is no reason we should sleep for a
long time there.

Reported-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Julian Anastasov <ja@ssi.bg>
This commit is contained in:
Pablo Neira Ayuso 2014-07-31 20:38:46 +02:00
parent b88825de85
commit 7926dbfa4b
5 changed files with 22 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
net/bridge/netfilter/ebtables.c
View File

@ -327,10 +327,7 @@ find_inlist_lock_noload(struct list_head *head, const char *name, int *error,
char name[EBT_FUNCTION_MAXNAMELEN];
} *e;
*error = mutex_lock_interruptible(mutex);
if (*error != 0)
return NULL;
mutex_lock(mutex);
list_for_each_entry(e, head, list) {
if (strcmp(e->name, name) == 0)
return e;
@ -1203,10 +1200,7 @@ ebt_register_table(struct net *net, const struct ebt_table *input_table)
table->private = newinfo;
rwlock_init(&table->lock);
ret = mutex_lock_interruptible(&ebt_mutex);
if (ret != 0)
goto free_chainstack;
mutex_lock(&ebt_mutex);
list_for_each_entry(t, &net->xt.tables[NFPROTO_BRIDGE], list) {
if (strcmp(t->name, table->name) == 0) {
ret = -EEXIST;

11
net/netfilter/core.c
View File

@ -35,11 +35,7 @@ EXPORT_SYMBOL_GPL(nf_ipv6_ops);
int nf_register_afinfo(const struct nf_afinfo *afinfo)
{
int err;
err = mutex_lock_interruptible(&afinfo_mutex);
if (err < 0)
return err;
mutex_lock(&afinfo_mutex);
RCU_INIT_POINTER(nf_afinfo[afinfo->family], afinfo);
mutex_unlock(&afinfo_mutex);
return 0;
@ -68,11 +64,8 @@ static DEFINE_MUTEX(nf_hook_mutex);
int nf_register_hook(struct nf_hook_ops *reg)
{
struct nf_hook_ops *elem;
int err;
err = mutex_lock_interruptible(&nf_hook_mutex);
if (err < 0)
return err;
mutex_lock(&nf_hook_mutex);
list_for_each_entry(elem, &nf_hooks[reg->pf][reg->hooknum], list) {
if (reg->priority < elem->priority)
break;

19
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -2271,10 +2271,7 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
cmd == IP_VS_SO_SET_STOPDAEMON) {
struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
if (mutex_lock_interruptible(&ipvs->sync_mutex)) {
ret = -ERESTARTSYS;
goto out_dec;
}
mutex_lock(&ipvs->sync_mutex);
if (cmd == IP_VS_SO_SET_STARTDAEMON)
ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
dm->syncid);
@ -2284,11 +2281,7 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
goto out_dec;
}
if (mutex_lock_interruptible(&__ip_vs_mutex)) {
ret = -ERESTARTSYS;
goto out_dec;
}
mutex_lock(&__ip_vs_mutex);
if (cmd == IP_VS_SO_SET_FLUSH) {
/* Flush the virtual service */
ret = ip_vs_flush(net, false);
@ -2573,9 +2566,7 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
struct ip_vs_daemon_user d[2];
memset(&d, 0, sizeof(d));
if (mutex_lock_interruptible(&ipvs->sync_mutex))
return -ERESTARTSYS;
mutex_lock(&ipvs->sync_mutex);
if (ipvs->sync_state & IP_VS_STATE_MASTER) {
d[0].state = IP_VS_STATE_MASTER;
strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
@ -2594,9 +2585,7 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
return ret;
}
if (mutex_lock_interruptible(&__ip_vs_mutex))
return -ERESTARTSYS;
mutex_lock(&__ip_vs_mutex);
switch (cmd) {
case IP_VS_SO_GET_VERSION:
{

8
net/netfilter/nf_sockopt.c
View File

@ -26,9 +26,7 @@ int nf_register_sockopt(struct nf_sockopt_ops *reg)
struct nf_sockopt_ops *ops;
int ret = 0;
if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
return -EINTR;
mutex_lock(&nf_sockopt_mutex);
list_for_each_entry(ops, &nf_sockopts, list) {
if (ops->pf == reg->pf
&& (overlap(ops->set_optmin, ops->set_optmax,
@ -65,9 +63,7 @@ static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, u_int8_t pf,
{
struct nf_sockopt_ops *ops;
if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
return ERR_PTR(-EINTR);
mutex_lock(&nf_sockopt_mutex);
list_for_each_entry(ops, &nf_sockopts, list) {
if (ops->pf == pf) {
if (!try_module_get(ops->owner))

47
net/netfilter/x_tables.c
View File

@ -71,18 +71,14 @@ static const char *const xt_prefix[NFPROTO_NUMPROTO] = {
static const unsigned int xt_jumpstack_multiplier = 2;
/* Registration hooks for targets. */
int
xt_register_target(struct xt_target *target)
int xt_register_target(struct xt_target *target)
{
u_int8_t af = target->family;
int ret;
ret = mutex_lock_interruptible(&xt[af].mutex);
if (ret != 0)
return ret;
mutex_lock(&xt[af].mutex);
list_add(&target->list, &xt[af].target);
mutex_unlock(&xt[af].mutex);
return ret;
return 0;
}
EXPORT_SYMBOL(xt_register_target);
@ -125,20 +121,14 @@ xt_unregister_targets(struct xt_target *target, unsigned int n)
}
EXPORT_SYMBOL(xt_unregister_targets);
int
xt_register_match(struct xt_match *match)
int xt_register_match(struct xt_match *match)
{
u_int8_t af = match->family;
int ret;
ret = mutex_lock_interruptible(&xt[af].mutex);
if (ret != 0)
return ret;
mutex_lock(&xt[af].mutex);
list_add(&match->list, &xt[af].match);
mutex_unlock(&xt[af].mutex);
return ret;
return 0;
}
EXPORT_SYMBOL(xt_register_match);
@ -194,9 +184,7 @@ struct xt_match *xt_find_match(u8 af, const char *name, u8 revision)
struct xt_match *m;
int err = -ENOENT;
if (mutex_lock_interruptible(&xt[af].mutex) != 0)
return ERR_PTR(-EINTR);
mutex_lock(&xt[af].mutex);
list_for_each_entry(m, &xt[af].match, list) {
if (strcmp(m->name, name) == 0) {
if (m->revision == revision) {
@ -239,9 +227,7 @@ struct xt_target *xt_find_target(u8 af, const char *name, u8 revision)
struct xt_target *t;
int err = -ENOENT;
if (mutex_lock_interruptible(&xt[af].mutex) != 0)
return ERR_PTR(-EINTR);
mutex_lock(&xt[af].mutex);
list_for_each_entry(t, &xt[af].target, list) {
if (strcmp(t->name, name) == 0) {
if (t->revision == revision) {
@ -323,10 +309,7 @@ int xt_find_revision(u8 af, const char *name, u8 revision, int target,
{
int have_rev, best = -1;
if (mutex_lock_interruptible(&xt[af].mutex) != 0) {
*err = -EINTR;
return 1;
}
mutex_lock(&xt[af].mutex);
if (target == 1)
have_rev = target_revfn(af, name, revision, &best);
else
@ -732,9 +715,7 @@ struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
{
struct xt_table *t;
if (mutex_lock_interruptible(&xt[af].mutex) != 0)
return ERR_PTR(-EINTR);
mutex_lock(&xt[af].mutex);
list_for_each_entry(t, &net->xt.tables[af], list)
if (strcmp(t->name, name) == 0 && try_module_get(t->me))
return t;
@ -883,10 +864,7 @@ struct xt_table *xt_register_table(struct net *net,
goto out;
}
ret = mutex_lock_interruptible(&xt[table->af].mutex);
if (ret != 0)
goto out_free;
mutex_lock(&xt[table->af].mutex);
/* Don't autoload: we'd eat our tail... */
list_for_each_entry(t, &net->xt.tables[table->af], list) {
if (strcmp(t->name, table->name) == 0) {
@ -911,9 +889,8 @@ struct xt_table *xt_register_table(struct net *net,
mutex_unlock(&xt[table->af].mutex);
return table;
unlock:
unlock:
mutex_unlock(&xt[table->af].mutex);
out_free:
kfree(table);
out:
return ERR_PTR(ret);