linux-kernel - [PATCH net-next 2/2] icmp: remove duplicate code

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Date:   Sat,  2 Nov 2019 01:12:04 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/2] icmp: remove duplicate code

The same code which recognizes ICMP error packets is duplicated several
times. Use the icmp_is_err() and icmpv6_is_err() helpers instead, which
do the same thing.

ip_multipath_l3_keys() and tcf_nat_act() didn't check for all the error types,
assume that they should instead.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 net/ipv4/netfilter/nf_socket_ipv4.c     | 10 +---------
 net/ipv4/route.c                        |  5 +----
 net/ipv6/route.c                        |  5 +----
 net/netfilter/nf_conntrack_proto_icmp.c |  6 +-----
 net/netfilter/xt_HMARK.c                |  6 +-----
 net/sched/act_nat.c                     |  4 +---
 6 files changed, 6 insertions(+), 30 deletions(-)

diff --git a/net/ipv4/netfilter/nf_socket_ipv4.c b/net/ipv4/netfilter/nf_socket_ipv4.c
index 36a28d46149c..c94445b44d8c 100644
--- a/net/ipv4/netfilter/nf_socket_ipv4.c
+++ b/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),
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 621f83434b24..dcc4fa10138d 100644
--- a/net/ipv4/route.c
+++ b/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,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a63ff85fe141..3f3085ab2832 100644
--- a/net/ipv6/route.c
+++ b/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,
diff --git a/net/netfilter/nf_conntrack_proto_icmp.c b/net/netfilter/nf_conntrack_proto_icmp.c
index 097deba7441a..c2e3dff773bc 100644
--- a/net/netfilter/nf_conntrack_proto_icmp.c
+++ b/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));
diff --git a/net/netfilter/xt_HMARK.c b/net/netfilter/xt_HMARK.c
index be7798a50546..713fb38541df 100644
--- a/net/netfilter/xt_HMARK.c
+++ b/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);
diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index 88a1b79a1848..855a6fa16a62 100644
--- a/net/sched/act_nat.c
+++ b/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) +
-- 
2.23.0