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netfilter: refcounter conversions 

refcount_t type and corresponding API (see include/linux/refcount.h)
should be used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Reshetova, Elena 2017-03-16 10:03:34 +02:00 committed by Pablo Neira Ayuso
parent 3c679cba58
commit b54ab92b84
21 changed files with 85 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/net/ip_vs.h
View File

@ -12,6 +12,8 @@
#include <linux/list.h> /* for struct list_head */
#include <linux/spinlock.h> /* for struct rwlock_t */
#include <linux/atomic.h> /* for struct atomic_t */
#include <linux/refcount.h> /* for struct refcount_t */
#include <linux/compiler.h>
#include <linux/timer.h>
#include <linux/bug.h>
@ -525,7 +527,7 @@ struct ip_vs_conn {
struct netns_ipvs *ipvs;
/* counter and timer */
atomic_t refcnt; /* reference count */
refcount_t refcnt; /* reference count */
struct timer_list timer; /* Expiration timer */
volatile unsigned long timeout; /* timeout */
@ -667,7 +669,7 @@ struct ip_vs_dest {
atomic_t conn_flags; /* flags to copy to conn */
atomic_t weight; /* server weight */
atomic_t refcnt; /* reference counter */
refcount_t refcnt; /* reference counter */
struct ip_vs_stats stats; /* statistics */
unsigned long idle_start; /* start time, jiffies */
@ -1211,14 +1213,14 @@ struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
*/
static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
{
return atomic_inc_not_zero(&cp->refcnt);
return refcount_inc_not_zero(&cp->refcnt);
}
/* put back the conn without restarting its timer */
static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
{
smp_mb__before_atomic();
atomic_dec(&cp->refcnt);
refcount_dec(&cp->refcnt);
}
void ip_vs_conn_put(struct ip_vs_conn *cp);
void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
@ -1410,18 +1412,18 @@ void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
{
atomic_inc(&dest->refcnt);
refcount_inc(&dest->refcnt);
}
static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
{
smp_mb__before_atomic();
atomic_dec(&dest->refcnt);
refcount_dec(&dest->refcnt);
}
static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
{
if (atomic_dec_and_test(&dest->refcnt))
if (refcount_dec_and_test(&dest->refcnt))
kfree(dest);
}

4
include/net/netfilter/nf_conntrack_expect.h
View File

@ -5,6 +5,8 @@
#ifndef _NF_CONNTRACK_EXPECT_H
#define _NF_CONNTRACK_EXPECT_H
#include <linux/refcount.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_zones.h>
@ -37,7 +39,7 @@ struct nf_conntrack_expect {
struct timer_list timeout;
/* Usage count. */
atomic_t use;
refcount_t use;
/* Flags */
unsigned int flags;

3
include/net/netfilter/nf_conntrack_timeout.h
View File

@ -4,6 +4,7 @@
#include <net/net_namespace.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <linux/refcount.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
@ -12,7 +13,7 @@
struct ctnl_timeout {
struct list_head head;
struct rcu_head rcu_head;
atomic_t refcnt;
refcount_t refcnt;
char name[CTNL_TIMEOUT_NAME_MAX];
__u16 l3num;
struct nf_conntrack_l4proto *l4proto;

19
net/ipv4/netfilter/ipt_CLUSTERIP.c
View File

@ -22,6 +22,7 @@
#include <linux/icmp.h>
#include <linux/if_arp.h>
#include <linux/seq_file.h>
#include <linux/refcount.h>
#include <linux/netfilter_arp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
@ -40,8 +41,8 @@ MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
struct clusterip_config {
struct list_head list; /* list of all configs */
atomic_t refcount; /* reference count */
atomic_t entries; /* number of entries/rules
refcount_t refcount; /* reference count */
refcount_t entries; /* number of entries/rules
* referencing us */
__be32 clusterip; /* the IP address */
@ -77,7 +78,7 @@ struct clusterip_net {
static inline void
clusterip_config_get(struct clusterip_config *c)
{
atomic_inc(&c->refcount);
refcount_inc(&c->refcount);
}
@ -89,7 +90,7 @@ static void clusterip_config_rcu_free(struct rcu_head *head)
static inline void
clusterip_config_put(struct clusterip_config *c)
{
if (atomic_dec_and_test(&c->refcount))
if (refcount_dec_and_test(&c->refcount))
call_rcu_bh(&c->rcu, clusterip_config_rcu_free);
}
@ -103,7 +104,7 @@ clusterip_config_entry_put(struct clusterip_config *c)
struct clusterip_net *cn = net_generic(net, clusterip_net_id);
local_bh_disable();
if (atomic_dec_and_lock(&c->entries, &cn->lock)) {
if (refcount_dec_and_lock(&c->entries, &cn->lock)) {
list_del_rcu(&c->list);
spin_unlock(&cn->lock);
local_bh_enable();
@ -149,10 +150,10 @@ clusterip_config_find_get(struct net *net, __be32 clusterip, int entry)
c = NULL;
else
#endif
if (unlikely(!atomic_inc_not_zero(&c->refcount)))
if (unlikely(!refcount_inc_not_zero(&c->refcount)))
c = NULL;
else if (entry)
atomic_inc(&c->entries);
refcount_inc(&c->entries);
}
rcu_read_unlock_bh();
@ -188,8 +189,8 @@ clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip,
clusterip_config_init_nodelist(c, i);
c->hash_mode = i->hash_mode;
c->hash_initval = i->hash_initval;
atomic_set(&c->refcount, 1);
atomic_set(&c->entries, 1);
refcount_set(&c->refcount, 1);
refcount_set(&c->entries, 1);
spin_lock_bh(&cn->lock);
if (__clusterip_config_find(net, ip)) {

24
net/netfilter/ipvs/ip_vs_conn.c
View File

@ -181,7 +181,7 @@ static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
cp->flags |= IP_VS_CONN_F_HASHED;
atomic_inc(&cp->refcnt);
refcount_inc(&cp->refcnt);
hlist_add_head_rcu(&cp->c_list, &ip_vs_conn_tab[hash]);
ret = 1;
} else {
@ -215,7 +215,7 @@ static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
if (cp->flags & IP_VS_CONN_F_HASHED) {
hlist_del_rcu(&cp->c_list);
cp->flags &= ~IP_VS_CONN_F_HASHED;
atomic_dec(&cp->refcnt);
refcount_dec(&cp->refcnt);
ret = 1;
} else
ret = 0;
@ -242,13 +242,13 @@ static inline bool ip_vs_conn_unlink(struct ip_vs_conn *cp)
if (cp->flags & IP_VS_CONN_F_HASHED) {
ret = false;
/* Decrease refcnt and unlink conn only if we are last user */
if (atomic_cmpxchg(&cp->refcnt, 1, 0) == 1) {
if (refcount_dec_if_one(&cp->refcnt)) {
hlist_del_rcu(&cp->c_list);
cp->flags &= ~IP_VS_CONN_F_HASHED;
ret = true;
}
} else
ret = atomic_read(&cp->refcnt) ? false : true;
ret = refcount_read(&cp->refcnt) ? false : true;
spin_unlock(&cp->lock);
ct_write_unlock_bh(hash);
@ -475,7 +475,7 @@ static void __ip_vs_conn_put_timer(struct ip_vs_conn *cp)
void ip_vs_conn_put(struct ip_vs_conn *cp)
{
if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) &&
(atomic_read(&cp->refcnt) == 1) &&
(refcount_read(&cp->refcnt) == 1) &&
!timer_pending(&cp->timer))
/* expire connection immediately */
__ip_vs_conn_put_notimer(cp);
@ -617,8 +617,8 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
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, atomic_read(&cp->refcnt),
atomic_read(&dest->refcnt));
cp->flags, refcount_read(&cp->refcnt),
refcount_read(&dest->refcnt));
/* Update the connection counters */
if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
@ -714,8 +714,8 @@ static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
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, atomic_read(&cp->refcnt),
atomic_read(&dest->refcnt));
cp->flags, refcount_read(&cp->refcnt),
refcount_read(&dest->refcnt));
/* Update the connection counters */
if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
@ -863,10 +863,10 @@ static void ip_vs_conn_expire(unsigned long data)
expire_later:
IP_VS_DBG(7, "delayed: conn->refcnt=%d conn->n_control=%d\n",
atomic_read(&cp->refcnt),
refcount_read(&cp->refcnt),
atomic_read(&cp->n_control));
atomic_inc(&cp->refcnt);
refcount_inc(&cp->refcnt);
cp->timeout = 60*HZ;
if (ipvs->sync_state & IP_VS_STATE_MASTER)
@ -941,7 +941,7 @@ ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
* it in the table, so that other thread run ip_vs_random_dropentry
* but cannot drop this entry.
*/
atomic_set(&cp->refcnt, 1);
refcount_set(&cp->refcnt, 1);
cp->control = NULL;
atomic_set(&cp->n_control, 0);

4
net/netfilter/ipvs/ip_vs_core.c
View File

@ -542,7 +542,7 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
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),
cp->flags, atomic_read(&cp->refcnt));
cp->flags, refcount_read(&cp->refcnt));
ip_vs_conn_stats(cp, svc);
return cp;
@ -1193,7 +1193,7 @@ struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
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),
cp->flags, atomic_read(&cp->refcnt));
cp->flags, refcount_read(&cp->refcnt));
LeaveFunction(12);
return cp;
}

12
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -699,7 +699,7 @@ ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
dest->vfwmark,
IP_VS_DBG_ADDR(dest->af, &dest->addr),
ntohs(dest->port),
atomic_read(&dest->refcnt));
refcount_read(&dest->refcnt));
if (dest->af == dest_af &&
ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
dest->port == dport &&
@ -934,7 +934,7 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
atomic_set(&dest->activeconns, 0);
atomic_set(&dest->inactconns, 0);
atomic_set(&dest->persistconns, 0);
atomic_set(&dest->refcnt, 1);
refcount_set(&dest->refcnt, 1);
INIT_HLIST_NODE(&dest->d_list);
spin_lock_init(&dest->dst_lock);
@ -998,7 +998,7 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
"dest->refcnt=%d, service %u/%s:%u\n",
IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
atomic_read(&dest->refcnt),
refcount_read(&dest->refcnt),
dest->vfwmark,
IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
ntohs(dest->vport));
@ -1074,7 +1074,7 @@ static void __ip_vs_del_dest(struct netns_ipvs *ipvs, struct ip_vs_dest *dest,
spin_lock_bh(&ipvs->dest_trash_lock);
IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
atomic_read(&dest->refcnt));
refcount_read(&dest->refcnt));
if (list_empty(&ipvs->dest_trash) && !cleanup)
mod_timer(&ipvs->dest_trash_timer,
jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
@ -1157,7 +1157,7 @@ static void ip_vs_dest_trash_expire(unsigned long data)
spin_lock(&ipvs->dest_trash_lock);
list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
if (atomic_read(&dest->refcnt) > 1)
if (refcount_read(&dest->refcnt) > 1)
continue;
if (dest->idle_start) {
if (time_before(now, dest->idle_start +
@ -1545,7 +1545,7 @@ ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
dev->name,
IP_VS_DBG_ADDR(dest->af, &dest->addr),
ntohs(dest->port),
atomic_read(&dest->refcnt));
refcount_read(&dest->refcnt));
__ip_vs_dst_cache_reset(dest);
}
spin_unlock_bh(&dest->dst_lock);

2
net/netfilter/ipvs/ip_vs_lblc.c
View File

@ -448,7 +448,7 @@ __ip_vs_lblc_schedule(struct ip_vs_service *svc)
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->refcnt),
refcount_read(&least->refcnt),
atomic_read(&least->weight), loh);
return least;

6
net/netfilter/ipvs/ip_vs_lblcr.c
View File

@ -204,7 +204,7 @@ static inline struct ip_vs_dest *ip_vs_dest_set_min(struct ip_vs_dest_set *set)
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->refcnt),
refcount_read(&least->refcnt),
atomic_read(&least->weight), loh);
return least;
}
@ -249,7 +249,7 @@ static inline struct ip_vs_dest *ip_vs_dest_set_max(struct ip_vs_dest_set *set)
__func__,
IP_VS_DBG_ADDR(most->af, &most->addr), ntohs(most->port),
atomic_read(&most->activeconns),
atomic_read(&most->refcnt),
refcount_read(&most->refcnt),
atomic_read(&most->weight), moh);
return most;
}
@ -612,7 +612,7 @@ __ip_vs_lblcr_schedule(struct ip_vs_service *svc)
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->refcnt),
refcount_read(&least->refcnt),
atomic_read(&least->weight), loh);
return least;

2
net/netfilter/ipvs/ip_vs_nq.c
View File

@ -110,7 +110,7 @@ ip_vs_nq_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->refcnt),
refcount_read(&least->refcnt),
atomic_read(&least->weight), loh);
return least;

2
net/netfilter/ipvs/ip_vs_proto_sctp.c
View File

@ -447,7 +447,7 @@ set_sctp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
ntohs(cp->cport),
sctp_state_name(cp->state),
sctp_state_name(next_state),
atomic_read(&cp->refcnt));
refcount_read(&cp->refcnt));
if (dest) {
if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
(next_state != IP_VS_SCTP_S_ESTABLISHED)) {

2
net/netfilter/ipvs/ip_vs_proto_tcp.c
View File

@ -557,7 +557,7 @@ set_tcp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
ntohs(cp->cport),
tcp_state_name(cp->state),
tcp_state_name(new_state),
atomic_read(&cp->refcnt));
refcount_read(&cp->refcnt));
if (dest) {
if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&

2
net/netfilter/ipvs/ip_vs_rr.c
View File

@ -97,7 +97,7 @@ stop:
"activeconns %d refcnt %d weight %d\n",
IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
atomic_read(&dest->activeconns),
atomic_read(&dest->refcnt), atomic_read(&dest->weight));
refcount_read(&dest->refcnt), atomic_read(&dest->weight));
return dest;
}

2
net/netfilter/ipvs/ip_vs_sed.c
View File

@ -111,7 +111,7 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->refcnt),
refcount_read(&least->refcnt),
atomic_read(&least->weight), loh);
return least;

2
net/netfilter/ipvs/ip_vs_wlc.c
View File

@ -83,7 +83,7 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->refcnt),
refcount_read(&least->refcnt),
atomic_read(&least->weight), loh);
return least;

2
net/netfilter/ipvs/ip_vs_wrr.c
View File

@ -218,7 +218,7 @@ found:
"activeconns %d refcnt %d weight %d\n",
IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
atomic_read(&dest->activeconns),
atomic_read(&dest->refcnt),
refcount_read(&dest->refcnt),
atomic_read(&dest->weight));
mark->cl = dest;

10
net/netfilter/nf_conntrack_expect.c
View File

@ -133,7 +133,7 @@ nf_ct_expect_find_get(struct net *net,
rcu_read_lock();
i = __nf_ct_expect_find(net, zone, tuple);
if (i && !atomic_inc_not_zero(&i->use))
if (i && !refcount_inc_not_zero(&i->use))
i = NULL;
rcu_read_unlock();
@ -186,7 +186,7 @@ nf_ct_find_expectation(struct net *net,
return NULL;
if (exp->flags & NF_CT_EXPECT_PERMANENT) {
atomic_inc(&exp->use);
refcount_inc(&exp->use);
return exp;
} else if (del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
@ -275,7 +275,7 @@ struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me)
return NULL;
new->master = me;
atomic_set(&new->use, 1);
refcount_set(&new->use, 1);
return new;
}
EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);
@ -348,7 +348,7 @@ static void nf_ct_expect_free_rcu(struct rcu_head *head)
void nf_ct_expect_put(struct nf_conntrack_expect *exp)
{
if (atomic_dec_and_test(&exp->use))
if (refcount_dec_and_test(&exp->use))
call_rcu(&exp->rcu, nf_ct_expect_free_rcu);
}
EXPORT_SYMBOL_GPL(nf_ct_expect_put);
@ -361,7 +361,7 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp)
unsigned int h = nf_ct_expect_dst_hash(net, &exp->tuple);
/* two references : one for hash insert, one for the timer */
atomic_add(2, &exp->use);
refcount_add(2, &exp->use);
hlist_add_head(&exp->lnode, &master_help->expectations);
master_help->expecting[exp->class]++;

4
net/netfilter/nf_conntrack_netlink.c
View File

@ -2693,7 +2693,7 @@ restart:
cb->nlh->nlmsg_seq,
IPCTNL_MSG_EXP_NEW,
exp) < 0) {
if (!atomic_inc_not_zero(&exp->use))
if (!refcount_inc_not_zero(&exp->use))
continue;
cb->args[1] = (unsigned long)exp;
goto out;
@ -2739,7 +2739,7 @@ restart:
cb->nlh->nlmsg_seq,
IPCTNL_MSG_EXP_NEW,
exp) < 0) {
if (!atomic_inc_not_zero(&exp->use))
if (!refcount_inc_not_zero(&exp->use))
continue;
cb->args[1] = (unsigned long)exp;
goto out;

16
net/netfilter/nfnetlink_acct.c
View File

@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/atomic.h>
#include <linux/refcount.h>
#include <linux/netlink.h>
#include <linux/rculist.h>
#include <linux/slab.h>
@ -32,7 +33,7 @@ struct nf_acct {
atomic64_t bytes;
unsigned long flags;
struct list_head head;
atomic_t refcnt;
refcount_t refcnt;
char name[NFACCT_NAME_MAX];
struct rcu_head rcu_head;
char data[0];
@ -123,7 +124,7 @@ static int nfnl_acct_new(struct net *net, struct sock *nfnl,
atomic64_set(&nfacct->pkts,
be64_to_cpu(nla_get_be64(tb[NFACCT_PKTS])));
}
atomic_set(&nfacct->refcnt, 1);
refcount_set(&nfacct->refcnt, 1);
list_add_tail_rcu(&nfacct->head, &net->nfnl_acct_list);
return 0;
}
@ -166,7 +167,7 @@ nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
NFACCT_PAD) ||
nla_put_be64(skb, NFACCT_BYTES, cpu_to_be64(bytes),
NFACCT_PAD) ||
nla_put_be32(skb, NFACCT_USE, htonl(atomic_read(&acct->refcnt))))
nla_put_be32(skb, NFACCT_USE, htonl(refcount_read(&acct->refcnt))))
goto nla_put_failure;
if (acct->flags & NFACCT_F_QUOTA) {
u64 *quota = (u64 *)acct->data;
@ -325,11 +326,12 @@ static int nfnl_acct_get(struct net *net, struct sock *nfnl,
static int nfnl_acct_try_del(struct nf_acct *cur)
{
int ret = 0;
unsigned int refcount;
/* We want to avoid races with nfnl_acct_put. So only when the current
* refcnt is 1, we decrease it to 0.
*/
if (atomic_cmpxchg(&cur->refcnt, 1, 0) == 1) {
if (refcount_dec_if_one(&cur->refcnt)) {
/* We are protected by nfnl mutex. */
list_del_rcu(&cur->head);
kfree_rcu(cur, rcu_head);
@ -413,7 +415,7 @@ struct nf_acct *nfnl_acct_find_get(struct net *net, const char *acct_name)
if (!try_module_get(THIS_MODULE))
goto err;
if (!atomic_inc_not_zero(&cur->refcnt)) {
if (!refcount_inc_not_zero(&cur->refcnt)) {
module_put(THIS_MODULE);
goto err;
}
@ -429,7 +431,7 @@ EXPORT_SYMBOL_GPL(nfnl_acct_find_get);
void nfnl_acct_put(struct nf_acct *acct)
{
if (atomic_dec_and_test(&acct->refcnt))
if (refcount_dec_and_test(&acct->refcnt))
kfree_rcu(acct, rcu_head);
module_put(THIS_MODULE);
@ -502,7 +504,7 @@ static void __net_exit nfnl_acct_net_exit(struct net *net)
list_for_each_entry_safe(cur, tmp, &net->nfnl_acct_list, head) {
list_del_rcu(&cur->head);
if (atomic_dec_and_test(&cur->refcnt))
if (refcount_dec_and_test(&cur->refcnt))
kfree_rcu(cur, rcu_head);
}
}

12
net/netfilter/nfnetlink_cttimeout.c
View File

@ -138,7 +138,7 @@ static int cttimeout_new_timeout(struct net *net, struct sock *ctnl,
strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
timeout->l3num = l3num;
timeout->l4proto = l4proto;
atomic_set(&timeout->refcnt, 1);
refcount_set(&timeout->refcnt, 1);
list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list);
return 0;
@ -172,7 +172,7 @@ ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) ||
nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
nla_put_be32(skb, CTA_TIMEOUT_USE,
htonl(atomic_read(&timeout->refcnt))))
htonl(refcount_read(&timeout->refcnt))))
goto nla_put_failure;
if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
@ -339,7 +339,7 @@ static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout)
/* We want to avoid races with ctnl_timeout_put. So only when the
* current refcnt is 1, we decrease it to 0.
*/
if (atomic_cmpxchg(&timeout->refcnt, 1, 0) == 1) {
if (refcount_dec_if_one(&timeout->refcnt)) {
/* We are protected by nfnl mutex. */
list_del_rcu(&timeout->head);
nf_ct_l4proto_put(timeout->l4proto);
@ -536,7 +536,7 @@ ctnl_timeout_find_get(struct net *net, const char *name)
if (!try_module_get(THIS_MODULE))
goto err;
if (!atomic_inc_not_zero(&timeout->refcnt)) {
if (!refcount_inc_not_zero(&timeout->refcnt)) {
module_put(THIS_MODULE);
goto err;
}
@ -550,7 +550,7 @@ err:
static void ctnl_timeout_put(struct ctnl_timeout *timeout)
{
if (atomic_dec_and_test(&timeout->refcnt))
if (refcount_dec_and_test(&timeout->refcnt))
kfree_rcu(timeout, rcu_head);
module_put(THIS_MODULE);
@ -601,7 +601,7 @@ static void __net_exit cttimeout_net_exit(struct net *net)
list_del_rcu(&cur->head);
nf_ct_l4proto_put(cur->l4proto);
if (atomic_dec_and_test(&cur->refcnt))
if (refcount_dec_and_test(&cur->refcnt))
kfree_rcu(cur, rcu_head);
}
}

14
net/netfilter/nfnetlink_log.c
View File

@ -40,6 +40,8 @@
#include <net/netfilter/nfnetlink_log.h>
#include <linux/atomic.h>
#include <linux/refcount.h>
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#include "../bridge/br_private.h"
@ -57,7 +59,7 @@
struct nfulnl_instance {
struct hlist_node hlist; /* global list of instances */
spinlock_t lock;
atomic_t use; /* use count */
refcount_t use; /* use count */
unsigned int qlen; /* number of nlmsgs in skb */
struct sk_buff *skb; /* pre-allocatd skb */
@ -115,7 +117,7 @@ __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
static inline void
instance_get(struct nfulnl_instance *inst)
{
atomic_inc(&inst->use);
refcount_inc(&inst->use);
}
static struct nfulnl_instance *
@ -125,7 +127,7 @@ instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
rcu_read_lock_bh();
inst = __instance_lookup(log, group_num);
if (inst && !atomic_inc_not_zero(&inst->use))
if (inst && !refcount_inc_not_zero(&inst->use))
inst = NULL;
rcu_read_unlock_bh();
@ -145,7 +147,7 @@ static void nfulnl_instance_free_rcu(struct rcu_head *head)
static void
instance_put(struct nfulnl_instance *inst)
{
if (inst && atomic_dec_and_test(&inst->use))
if (inst && refcount_dec_and_test(&inst->use))
call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
}
@ -180,7 +182,7 @@ instance_create(struct net *net, u_int16_t group_num,
INIT_HLIST_NODE(&inst->hlist);
spin_lock_init(&inst->lock);
/* needs to be two, since we _put() after creation */
atomic_set(&inst->use, 2);
refcount_set(&inst->use, 2);
setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
@ -1031,7 +1033,7 @@ static int seq_show(struct seq_file *s, void *v)
inst->group_num,
inst->peer_portid, inst->qlen,
inst->copy_mode, inst->copy_range,
inst->flushtimeout, atomic_read(&inst->use));
inst->flushtimeout, refcount_read(&inst->use));
return 0;
}