Merge branch 'icmp-move-duplicate-code-in-helper-functions'

Matteo Croce says:

====================
icmp: move duplicate code in helper functions

Remove some duplicate code by moving it in two helper functions.
First patch adds the helpers, the second one uses it.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/icmp.h

@@ -20,4 +20,19 @@ static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
 {
 	return (struct icmphdr *)skb_transport_header(skb);
 }
+
+static inline bool icmp_is_err(int type)
+{
+	switch (type) {
+	case ICMP_DEST_UNREACH:
+	case ICMP_SOURCE_QUENCH:
+	case ICMP_REDIRECT:
+	case ICMP_TIME_EXCEEDED:
+	case ICMP_PARAMETERPROB:
+		return true;
+	}
+
+	return false;
+}
+
 #endif	/* _LINUX_ICMP_H */

include/linux/icmpv6.h

@@ -46,4 +46,18 @@ extern void				icmpv6_flow_init(struct sock *sk,
 							 const struct in6_addr *saddr,
 							 const struct in6_addr *daddr,
 							 int oif);
+
+static inline bool icmpv6_is_err(int type)
+{
+	switch (type) {
+	case ICMPV6_DEST_UNREACH:
+	case ICMPV6_PKT_TOOBIG:
+	case ICMPV6_TIME_EXCEED:
+	case ICMPV6_PARAMPROB:
+		return true;
+	}
+
+	return false;
+}
+
 #endif

net/ipv4/netfilter/nf_socket_ipv4.c

@@ -31,16 +31,8 @@ extract_icmp4_fields(const struct sk_buff *skb, u8 *protocol,
 	if (icmph == NULL)
 		return 1;
 
-	switch (icmph->type) {
-	case ICMP_DEST_UNREACH:
-	case ICMP_SOURCE_QUENCH:
-	case ICMP_REDIRECT:
-	case ICMP_TIME_EXCEEDED:
-	case ICMP_PARAMETERPROB:
-		break;
-	default:
+	if (!icmp_is_err(icmph->type))
 		return 1;
-	}
 
 	inside_iph = skb_header_pointer(skb, outside_hdrlen +
 					sizeof(struct icmphdr),

net/ipv4/route.c

@@ -1894,10 +1894,7 @@ static void ip_multipath_l3_keys(const struct sk_buff *skb,
 	if (!icmph)
 		goto out;
 
-	if (icmph->type != ICMP_DEST_UNREACH &&
-	    icmph->type != ICMP_REDIRECT &&
-	    icmph->type != ICMP_TIME_EXCEEDED &&
-	    icmph->type != ICMP_PARAMETERPROB)
+	if (!icmp_is_err(icmph->type))
 		goto out;
 
 	inner_iph = skb_header_pointer(skb,

net/ipv6/route.c

@@ -2291,10 +2291,7 @@ static void ip6_multipath_l3_keys(const struct sk_buff *skb,
 	if (!icmph)
 		goto out;
 
-	if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
-	    icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
-	    icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
-	    icmph->icmp6_type != ICMPV6_PARAMPROB)
+	if (!icmpv6_is_err(icmph->icmp6_type))
 		goto out;
 
 	inner_iph = skb_header_pointer(skb,

net/netfilter/nf_conntrack_proto_icmp.c

@@ -235,11 +235,7 @@ int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
 	}
 
 	/* Need to track icmp error message? */
-	if (icmph->type != ICMP_DEST_UNREACH &&
-	    icmph->type != ICMP_SOURCE_QUENCH &&
-	    icmph->type != ICMP_TIME_EXCEEDED &&
-	    icmph->type != ICMP_PARAMETERPROB &&
-	    icmph->type != ICMP_REDIRECT)
+	if (!icmp_is_err(icmph->type))
 		return NF_ACCEPT;
 
 	memset(&outer_daddr, 0, sizeof(outer_daddr));

net/netfilter/xt_HMARK.c

@@ -239,11 +239,7 @@ static int get_inner_hdr(const struct sk_buff *skb, int iphsz, int *nhoff)
 		return 0;
 
 	/* Error message? */
-	if (icmph->type != ICMP_DEST_UNREACH &&
-	    icmph->type != ICMP_SOURCE_QUENCH &&
-	    icmph->type != ICMP_TIME_EXCEEDED &&
-	    icmph->type != ICMP_PARAMETERPROB &&
-	    icmph->type != ICMP_REDIRECT)
+	if (!icmp_is_err(icmph->type))
 		return 0;
 
 	*nhoff += iphsz + sizeof(_ih);

net/sched/act_nat.c

@@ -206,9 +206,7 @@ static int tcf_nat_act(struct sk_buff *skb, const struct tc_action *a,
 
 		icmph = (void *)(skb_network_header(skb) + ihl);
 
-		if ((icmph->type != ICMP_DEST_UNREACH) &&
-		    (icmph->type != ICMP_TIME_EXCEEDED) &&
-		    (icmph->type != ICMP_PARAMETERPROB))
+		if (!icmp_is_err(icmph->type))
 			break;
 
 		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) +