diff --git a/extensions/libxt_pknock.c b/extensions/libxt_pknock.c
index eef8f71..0167f7c 100644
--- a/extensions/libxt_pknock.c
+++ b/extensions/libxt_pknock.c
@@ -71,7 +71,7 @@ parse_ports(const char *portstring, uint16_t *ports, const char *proto)
 			*next++ = '\0';
 		ports[i] = xtables_parse_port(cp, proto);
 	}
-	
+
 	if (cp != NULL)
 		xtables_error(PARAMETER_PROBLEM, "too many ports specified");
 
@@ -109,7 +109,7 @@ check_proto(uint16_t pnum, uint8_t invflags)
 }
 
 /* Function which parses command options; returns true if it ate an option */
-static int 
+static int
 __pknock_parse(int c, char **argv, int invert, unsigned int *flags,
 		struct xt_entry_match **match, uint16_t pnum,
 		uint16_t invflags)
@@ -230,7 +230,7 @@ static int pknock_parse(int c, char **argv, int invert, unsigned int *flags,
                 		const void *e, struct xt_entry_match **match)
 {
 	const struct ipt_entry *entry = e;
-	return __pknock_parse(c, argv, invert, flags, match, 
+	return __pknock_parse(c, argv, invert, flags, match,
 			entry->ip.proto, entry->ip.invflags);
 }
 
@@ -274,7 +274,7 @@ static void pknock_check(unsigned int flags)
 }
 
 /* Prints out the matchinfo. */
-static void pknock_print(const void *ip, 
+static void pknock_print(const void *ip,
 						const struct xt_entry_match *match, int numeric)
 {
 	const struct xt_pknock_mtinfo *info = (void *)match->data;
@@ -338,7 +338,7 @@ static struct xtables_match pknock_match = {
 	.extra_opts	= pknock_opts
 };
 
-void _init(void) 
+void _init(void)
 {
 	xtables_register_match(&pknock_match);
 }
diff --git a/extensions/xt_pknock.c b/extensions/xt_pknock.c
index 5ad962c..8d0b392 100644
--- a/extensions/xt_pknock.c
+++ b/extensions/xt_pknock.c
@@ -171,7 +171,7 @@ alloc_hashtable(unsigned int size)
 
 	hash = kmalloc(sizeof(*hash) * size, GFP_ATOMIC);
 	if (hash == NULL) {
-		printk(KERN_ERR PKNOCK 
+		printk(KERN_ERR PKNOCK
 						"kmalloc() error in alloc_hashtable() function.\n");
 		return NULL;
 	}
@@ -366,7 +366,7 @@ peer_gc(unsigned long r)
 	hashtable_for_each_safe(pos, n, rule->peer_head, peer_hashsize, i) {
 		peer = list_entry(pos, struct peer, head);
 
-		if (!has_logged_during_this_minute(peer) && 
+		if (!has_logged_during_this_minute(peer) &&
 						is_time_exceeded(peer, rule->max_time))
 		{
 			pk_debug("DESTROYED", peer);
@@ -976,7 +976,7 @@ static bool pknock_mt(const struct sk_buff *skb,
 #endif
 
 	default:
-		printk(KERN_INFO PKNOCK 
+		printk(KERN_INFO PKNOCK
 						"IP payload protocol is neither tcp nor udp.\n");
 		return false;
 	}
@@ -986,7 +986,7 @@ static bool pknock_mt(const struct sk_buff *skb,
 	/* Searches a rule from the list depending on info structure options. */
 	rule = search_rule(info);
 	if (rule == NULL) {
-		printk(KERN_INFO PKNOCK "The rule %s doesn't exist.\n", 
+		printk(KERN_INFO PKNOCK "The rule %s doesn't exist.\n",
 						info->rule_name);
 		goto out;
 	}
@@ -998,17 +998,17 @@ static bool pknock_mt(const struct sk_buff *skb,
 		ret = is_allowed(peer);
 		goto out;
 	}
-	
+
 	if (iph->protocol == IPPROTO_UDP) {
 		hdr.payload = (void *)iph + hdr_len;
 		hdr.payload_len = skb->len - hdr_len;
 	}
-	
+
 	/* Sets, updates, removes or checks the peer matching status. */
 	if (info->option & XT_PKNOCK_KNOCKPORT) {
 		if ((ret = is_allowed(peer))) {
 #ifdef PK_CRYPTO
-			if (info->option & XT_PKNOCK_CLOSESECRET && 
+			if (info->option & XT_PKNOCK_CLOSESECRET &&
 							iph->protocol == IPPROTO_UDP)
 			{
 				if (is_close_knock(peer, info, hdr.payload, hdr.payload_len))
@@ -1069,10 +1069,10 @@ static bool pknock_mt_check(const struct xt_mtchk_param *par)
 			RETURN_ERR("Can't specify --knockports with --checkip.\n");
 #ifdef PK_CRYPTO
 		if ((info->option & XT_PKNOCK_OPENSECRET) &&
-				!(info->option & XT_PKNOCK_CLOSESECRET)) 
+				!(info->option & XT_PKNOCK_CLOSESECRET))
 			RETURN_ERR("--opensecret must go with --closesecret.\n");
 		if ((info->option & XT_PKNOCK_CLOSESECRET) &&
-				!(info->option & XT_PKNOCK_OPENSECRET)) 
+				!(info->option & XT_PKNOCK_OPENSECRET))
 			RETURN_ERR("--closesecret must go with --opensecret.\n");
 #endif
 	}
@@ -1135,7 +1135,7 @@ static int __init xt_pknock_mt_init(void)
 	crypto.tfm = crypto_alloc_hash(crypto.algo, 0, CRYPTO_ALG_ASYNC);
 
 	if (crypto.tfm == NULL) {
-		printk(KERN_ERR PKNOCK "failed to load transform for %s\n", 
+		printk(KERN_ERR PKNOCK "failed to load transform for %s\n",
 						crypto.algo);
 		return -ENXIO;
 	}