net: fix the counter ICMP_MIB_INERRORS/ICMP6_MIB_INERRORS
When dealing with ICMPv[46] Error Message, function icmp_socket_deliver()
and icmpv6_notify() do some valid checks on packet's length, but then some
protocols check packet's length redaudantly. So remove those duplicated
statements, and increase counter ICMP_MIB_INERRORS/ICMP6_MIB_INERRORS in
function icmp_socket_deliver() and icmpv6_notify() respectively.
In addition, add missed counter in udp6/udplite6 when socket is NULL.
Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 42b7bcf..092400e 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -663,8 +663,10 @@
/* Checkin full IP header plus 8 bytes of protocol to
* avoid additional coding at protocol handlers.
*/
- if (!pskb_may_pull(skb, iph->ihl * 4 + 8))
+ if (!pskb_may_pull(skb, iph->ihl * 4 + 8)) {
+ ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
return;
+ }
raw_icmp_error(skb, protocol, info);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1edc739..d0ba395 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -344,11 +344,6 @@
int err;
struct net *net = dev_net(icmp_skb->dev);
- if (icmp_skb->len < (iph->ihl << 2) + 8) {
- ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
- return;
- }
-
sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest,
iph->saddr, th->source, inet_iif(icmp_skb));
if (!sk) {
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index f6c84a6..06ba3e5 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -626,9 +626,10 @@
int inner_offset;
__be16 frag_off;
u8 nexthdr;
+ struct net *net = dev_net(skb->dev);
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
- return;
+ goto out;
nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
if (ipv6_ext_hdr(nexthdr)) {
@@ -636,14 +637,14 @@
inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
&nexthdr, &frag_off);
if (inner_offset<0)
- return;
+ goto out;
} else {
inner_offset = sizeof(struct ipv6hdr);
}
/* Checkin header including 8 bytes of inner protocol header. */
if (!pskb_may_pull(skb, inner_offset+8))
- return;
+ goto out;
/* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
Without this we will not able f.e. to make source routed
@@ -652,13 +653,15 @@
--ANK (980726)
*/
- rcu_read_lock();
ipprot = rcu_dereference(inet6_protos[nexthdr]);
if (ipprot && ipprot->err_handler)
ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
- rcu_read_unlock();
raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
+ return;
+
+out:
+ ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
}
/*
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 5b6091d..c6941a1 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -533,11 +533,15 @@
struct udphdr *uh = (struct udphdr*)(skb->data+offset);
struct sock *sk;
int err;
+ struct net *net = dev_net(skb->dev);
- sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
+ sk = __udp6_lib_lookup(net, daddr, uh->dest,
saddr, uh->source, inet6_iif(skb), udptable);
- if (sk == NULL)
+ if (sk == NULL) {
+ ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
+ ICMP6_MIB_INERRORS);
return;
+ }
if (type == ICMPV6_PKT_TOOBIG) {
if (!ip6_sk_accept_pmtu(sk))
diff --git a/net/sctp/input.c b/net/sctp/input.c
index f2e2cbd..c1b9912 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -575,11 +575,6 @@
int err;
struct net *net = dev_net(skb->dev);
- if (skb->len < ihlen + 8) {
- ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
- return;
- }
-
/* Fix up skb to look at the embedded net header. */
saveip = skb->network_header;
savesctp = skb->transport_header;