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Date: Thu, 31 Jul 2014 17:54:32 +0800
From: Duan Jiong <duanj.fnst@...fujitsu.com>
To: David Miller <davem@...emloft.net>
CC: Hannes Frederic Sowa <hannes@...essinduktion.org>,
<eric.dumazet@...il.com>, netdev <netdev@...r.kernel.org>
Subject: [PATCH v2] 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@...fujitsu.com>
---
v2: remove nested rcu_read_lock from icmpv6_notify
net/ipv4/icmp.c | 4 +++-
net/ipv4/tcp_ipv4.c | 5 -----
net/ipv6/icmp.c | 13 ++++++++-----
net/ipv6/udp.c | 8 ++++++--
net/sctp/input.c | 5 -----
5 files changed, 17 insertions(+), 18 deletions(-)
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 @@ static void icmp_socket_deliver(struct sk_buff *skb, u32 info)
/* 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 77cccda..715cf6b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -342,11 +342,6 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
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 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
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 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
--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 7092ff7..f13d297 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -534,11 +534,15 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
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;
--
1.8.3.1
--
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