netfilter: Remove unnecessary cast on void pointer

The following Coccinelle script was used to detect this:
@r@
expression x;
void* e;
type T;
identifier f;
@@
(
  *((T *)e)
|
  ((T *)x)[...]
|
  ((T*)x)->f
|

- (T*)
  e
)

Unnecessary parantheses are also remove.
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/bridge/netfilter/ebtables.c

@@ -1713,7 +1713,7 @@ static int compat_copy_entry_to_user(struct ebt_entry *e, void __user **dstptr,
 	if (*size < sizeof(*ce))
 		return -EINVAL;
 
-	ce = (struct ebt_entry __user *)*dstptr;
+	ce = *dstptr;
 	if (copy_to_user(ce, e, sizeof(*ce)))
 		return -EFAULT;
 

net/ipv4/netfilter/arp_tables.c

@@ -309,8 +309,7 @@ static int mark_source_chains(const struct xt_table_info *newinfo,
 	 */
 	for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) {
 		unsigned int pos = newinfo->hook_entry[hook];
-		struct arpt_entry *e
-			= (struct arpt_entry *)(entry0 + pos);
+		struct arpt_entry *e = entry0 + pos;
 
 		if (!(valid_hooks & (1 << hook)))
 			continue;
@@ -354,14 +353,12 @@ static int mark_source_chains(const struct xt_table_info *newinfo,
 					if (pos == oldpos)
 						goto next;
 
-					e = (struct arpt_entry *)
-						(entry0 + pos);
+					e = entry0 + pos;
 				} while (oldpos == pos + e->next_offset);
 
 				/* Move along one */
 				size = e->next_offset;
-				e = (struct arpt_entry *)
-					(entry0 + pos + size);
+				e = entry0 + pos + size;
 				if (pos + size >= newinfo->size)
 					return 0;
 				e->counters.pcnt = pos;
@@ -376,16 +373,14 @@ static int mark_source_chains(const struct xt_table_info *newinfo,
 					if (!xt_find_jump_offset(offsets, newpos,
 								 newinfo->number))
 						return 0;
-					e = (struct arpt_entry *)
-						(entry0 + newpos);
+					e = entry0 + newpos;
 				} else {
 					/* ... this is a fallthru */
 					newpos = pos + e->next_offset;
 					if (newpos >= newinfo->size)
 						return 0;
 				}
-				e = (struct arpt_entry *)
-					(entry0 + newpos);
+				e = entry0 + newpos;
 				e->counters.pcnt = pos;
 				pos = newpos;
 			}
@@ -681,7 +676,7 @@ static int copy_entries_to_user(unsigned int total_size,
 	for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
 		const struct xt_entry_target *t;
 
-		e = (struct arpt_entry *)(loc_cpu_entry + off);
+		e = loc_cpu_entry + off;
 		if (copy_to_user(userptr + off, e, sizeof(*e))) {
 			ret = -EFAULT;
 			goto free_counters;
@@ -1128,7 +1123,7 @@ compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
 	int h;
 
 	origsize = *size;
-	de = (struct arpt_entry *)*dstptr;
+	de = *dstptr;
 	memcpy(de, e, sizeof(struct arpt_entry));
 	memcpy(&de->counters, &e->counters, sizeof(e->counters));
 
@@ -1322,7 +1317,7 @@ static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr,
 	int ret;
 
 	origsize = *size;
-	ce = (struct compat_arpt_entry __user *)*dstptr;
+	ce = *dstptr;
 	if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 ||
 	    copy_to_user(&ce->counters, &counters[i],
 	    sizeof(counters[i])) != 0)

net/ipv4/netfilter/ip_tables.c

@@ -382,7 +382,7 @@ mark_source_chains(const struct xt_table_info *newinfo,
 	   to 0 as we leave), and comefrom to save source hook bitmask */
 	for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
 		unsigned int pos = newinfo->hook_entry[hook];
-		struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos);
+		struct ipt_entry *e = entry0 + pos;
 
 		if (!(valid_hooks & (1 << hook)))
 			continue;
@@ -424,14 +424,12 @@ mark_source_chains(const struct xt_table_info *newinfo,
 					if (pos == oldpos)
 						goto next;
 
-					e = (struct ipt_entry *)
-						(entry0 + pos);
+					e = entry0 + pos;
 				} while (oldpos == pos + e->next_offset);
 
 				/* Move along one */
 				size = e->next_offset;
-				e = (struct ipt_entry *)
-					(entry0 + pos + size);
+				e = entry0 + pos + size;
 				if (pos + size >= newinfo->size)
 					return 0;
 				e->counters.pcnt = pos;
@@ -446,16 +444,14 @@ mark_source_chains(const struct xt_table_info *newinfo,
 					if (!xt_find_jump_offset(offsets, newpos,
 								 newinfo->number))
 						return 0;
-					e = (struct ipt_entry *)
-						(entry0 + newpos);
+					e = entry0 + newpos;
 				} else {
 					/* ... this is a fallthru */
 					newpos = pos + e->next_offset;
 					if (newpos >= newinfo->size)
 						return 0;
 				}
-				e = (struct ipt_entry *)
-					(entry0 + newpos);
+				e = entry0 + newpos;
 				e->counters.pcnt = pos;
 				pos = newpos;
 			}
@@ -834,7 +830,7 @@ copy_entries_to_user(unsigned int total_size,
 		const struct xt_entry_match *m;
 		const struct xt_entry_target *t;
 
-		e = (struct ipt_entry *)(loc_cpu_entry + off);
+		e = loc_cpu_entry + off;
 		if (copy_to_user(userptr + off, e, sizeof(*e))) {
 			ret = -EFAULT;
 			goto free_counters;
@@ -1229,7 +1225,7 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
 	int ret = 0;
 
 	origsize = *size;
-	ce = (struct compat_ipt_entry __user *)*dstptr;
+	ce = *dstptr;
 	if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 ||
 	    copy_to_user(&ce->counters, &counters[i],
 	    sizeof(counters[i])) != 0)
@@ -1366,7 +1362,7 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
 	struct xt_entry_match *ematch;
 
 	origsize = *size;
-	de = (struct ipt_entry *)*dstptr;
+	de = *dstptr;
 	memcpy(de, e, sizeof(struct ipt_entry));
 	memcpy(&de->counters, &e->counters, sizeof(e->counters));
 

net/ipv6/netfilter/ip6_tables.c

@@ -411,7 +411,7 @@ mark_source_chains(const struct xt_table_info *newinfo,
 	   to 0 as we leave), and comefrom to save source hook bitmask */
 	for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
 		unsigned int pos = newinfo->hook_entry[hook];
-		struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos);
+		struct ip6t_entry *e = entry0 + pos;
 
 		if (!(valid_hooks & (1 << hook)))
 			continue;
@@ -453,14 +453,12 @@ mark_source_chains(const struct xt_table_info *newinfo,
 					if (pos == oldpos)
 						goto next;
 
-					e = (struct ip6t_entry *)
-						(entry0 + pos);
+					e = entry0 + pos;
 				} while (oldpos == pos + e->next_offset);
 
 				/* Move along one */
 				size = e->next_offset;
-				e = (struct ip6t_entry *)
-					(entry0 + pos + size);
+				e = entry0 + pos + size;
 				if (pos + size >= newinfo->size)
 					return 0;
 				e->counters.pcnt = pos;
@@ -475,16 +473,14 @@ mark_source_chains(const struct xt_table_info *newinfo,
 					if (!xt_find_jump_offset(offsets, newpos,
 								 newinfo->number))
 						return 0;
-					e = (struct ip6t_entry *)
-						(entry0 + newpos);
+					e = entry0 + newpos;
 				} else {
 					/* ... this is a fallthru */
 					newpos = pos + e->next_offset;
 					if (newpos >= newinfo->size)
 						return 0;
 				}
-				e = (struct ip6t_entry *)
-					(entry0 + newpos);
+				e = entry0 + newpos;
 				e->counters.pcnt = pos;
 				pos = newpos;
 			}
@@ -863,7 +859,7 @@ copy_entries_to_user(unsigned int total_size,
 		const struct xt_entry_match *m;
 		const struct xt_entry_target *t;
 
-		e = (struct ip6t_entry *)(loc_cpu_entry + off);
+		e = loc_cpu_entry + off;
 		if (copy_to_user(userptr + off, e, sizeof(*e))) {
 			ret = -EFAULT;
 			goto free_counters;
@@ -1258,7 +1254,7 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
 	int ret = 0;
 
 	origsize = *size;
-	ce = (struct compat_ip6t_entry __user *)*dstptr;
+	ce = *dstptr;
 	if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
 	    copy_to_user(&ce->counters, &counters[i],
 	    sizeof(counters[i])) != 0)
@@ -1394,7 +1390,7 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
 	struct xt_entry_match *ematch;
 
 	origsize = *size;
-	de = (struct ip6t_entry *)*dstptr;
+	de = *dstptr;
 	memcpy(de, e, sizeof(struct ip6t_entry));
 	memcpy(&de->counters, &e->counters, sizeof(e->counters));
 

net/netfilter/ipset/ip_set_bitmap_gen.h

@@ -232,7 +232,7 @@ mtype_list(const struct ip_set *set,
 		if (!test_bit(id, map->members) ||
 		    (SET_WITH_TIMEOUT(set) &&
 #ifdef IP_SET_BITMAP_STORED_TIMEOUT
-		     mtype_is_filled((const struct mtype_elem *)x) &&
+		     mtype_is_filled(x) &&
 #endif
 		     ip_set_timeout_expired(ext_timeout(x, set))))
 			continue;
@@ -248,8 +248,7 @@ mtype_list(const struct ip_set *set,
 		}
 		if (mtype_do_list(skb, map, id, set->dsize))
 			goto nla_put_failure;
-		if (ip_set_put_extensions(skb, set, x,
-		    mtype_is_filled((const struct mtype_elem *)x)))
+		if (ip_set_put_extensions(skb, set, x, mtype_is_filled(x)))
 			goto nla_put_failure;
 		ipset_nest_end(skb, nested);
 	}

net/netfilter/ipset/ip_set_core.c

@@ -1915,7 +1915,7 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
 		ret = -EFAULT;
 		goto done;
 	}
-	op = (unsigned int *)data;
+	op = data;
 
 	if (*op < IP_SET_OP_VERSION) {
 		/* Check the version at the beginning of operations */

net/netfilter/nf_conntrack_proto.c

@@ -202,7 +202,7 @@ static int kill_l3proto(struct nf_conn *i, void *data)
 static int kill_l4proto(struct nf_conn *i, void *data)
 {
 	struct nf_conntrack_l4proto *l4proto;
-	l4proto = (struct nf_conntrack_l4proto *)data;
+	l4proto = data;
 	return nf_ct_protonum(i) == l4proto->l4proto &&
 	       nf_ct_l3num(i) == l4proto->l3proto;
 }

net/netfilter/nft_set_hash.c

@@ -352,7 +352,7 @@ static int nft_hash_init(const struct nft_set *set,
 
 static void nft_hash_elem_destroy(void *ptr, void *arg)
 {
-	nft_set_elem_destroy((const struct nft_set *)arg, ptr, true);
+	nft_set_elem_destroy(arg, ptr, true);
 }
 
 static void nft_hash_destroy(const struct nft_set *set)

net/netfilter/xt_hashlimit.c

@@ -119,7 +119,7 @@ static int
 cfg_copy(struct hashlimit_cfg2 *to, void *from, int revision)
 {
 	if (revision == 1) {
-		struct hashlimit_cfg1 *cfg = (struct hashlimit_cfg1 *)from;
+		struct hashlimit_cfg1 *cfg = from;
 
 		to->mode = cfg->mode;
 		to->avg = cfg->avg;
@@ -895,7 +895,7 @@ static void *dl_seq_start(struct seq_file *s, loff_t *pos)
 static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
 	struct xt_hashlimit_htable *htable = s->private;
-	unsigned int *bucket = (unsigned int *)v;
+	unsigned int *bucket = v;
 
 	*pos = ++(*bucket);
 	if (*pos >= htable->cfg.size) {
@@ -909,7 +909,7 @@ static void dl_seq_stop(struct seq_file *s, void *v)
 	__releases(htable->lock)
 {
 	struct xt_hashlimit_htable *htable = s->private;
-	unsigned int *bucket = (unsigned int *)v;
+	unsigned int *bucket = v;
 
 	if (!IS_ERR(bucket))
 		kfree(bucket);
@@ -980,7 +980,7 @@ static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
 static int dl_seq_show_v1(struct seq_file *s, void *v)
 {
 	struct xt_hashlimit_htable *htable = s->private;
-	unsigned int *bucket = (unsigned int *)v;
+	unsigned int *bucket = v;
 	struct dsthash_ent *ent;
 
 	if (!hlist_empty(&htable->hash[*bucket])) {
@@ -994,7 +994,7 @@ static int dl_seq_show_v1(struct seq_file *s, void *v)
 static int dl_seq_show(struct seq_file *s, void *v)
 {
 	struct xt_hashlimit_htable *htable = s->private;
-	unsigned int *bucket = (unsigned int *)v;
+	unsigned int *bucket = v;
 	struct dsthash_ent *ent;
 
 	if (!hlist_empty(&htable->hash[*bucket])) {