[NETFILTER]: nf_sockopts list head cleanup

Code is using knowledge that nf_sockopt_ops::list list_head is first
field in structure by using casts. Switch to list_for_each_entry()
itetators while I am at it.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 9 deletions

diff --git a/net/netfilter/nf_sockopt.c b/net/netfilter/nf_sockopt.c
index aa2831587b82..2dfac3253569 100644
--- a/net/netfilter/nf_sockopt.c
+++ b/net/netfilter/nf_sockopt.c
@@ -23,14 +23,13 @@ static inline int overlap(int min1, int max1, int min2, int max2)
 /* Functions to register sockopt ranges (exclusive). */
 int nf_register_sockopt(struct nf_sockopt_ops *reg)
 {
-        struct list_head *i;
+        struct nf_sockopt_ops *ops;
         int ret = 0;
 
         if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
                 return -EINTR;
 
-        list_for_each(i, &nf_sockopts) {
-                struct nf_sockopt_ops *ops = (struct nf_sockopt_ops *)i;
+        list_for_each_entry(ops, &nf_sockopts, list) {
                 if (ops->pf == reg->pf
                     && (overlap(ops->set_optmin, ops->set_optmax,
                                 reg->set_optmin, reg->set_optmax)
@@ -65,7 +64,6 @@ EXPORT_SYMBOL(nf_unregister_sockopt);
 static int nf_sockopt(struct sock *sk, int pf, int val,
                       char __user *opt, int *len, int get)
 {
-        struct list_head *i;
         struct nf_sockopt_ops *ops;
         int ret;
 
@@ -75,8 +73,7 @@ static int nf_sockopt(struct sock *sk, int pf, int val,
         if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
                 return -EINTR;
 
-        list_for_each(i, &nf_sockopts) {
-                ops = (struct nf_sockopt_ops *)i;
+        list_for_each_entry(ops, &nf_sockopts, list) {
                 if (ops->pf == pf) {
                         if (!try_module_get(ops->owner))
                                 goto out_nosup;
@@ -124,7 +121,6 @@ EXPORT_SYMBOL(nf_getsockopt);
 static int compat_nf_sockopt(struct sock *sk, int pf, int val,
                              char __user *opt, int *len, int get)
 {
-        struct list_head *i;
         struct nf_sockopt_ops *ops;
         int ret;
 
@@ -135,8 +131,7 @@ static int compat_nf_sockopt(struct sock *sk, int pf, int val,
         if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
                 return -EINTR;
 
-        list_for_each(i, &nf_sockopts) {
-                ops = (struct nf_sockopt_ops *)i;
+        list_for_each_entry(ops, &nf_sockopts, list) {
                 if (ops->pf == pf) {
                         if (!try_module_get(ops->owner))
                                 goto out_nosup;