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authorEric Dumazet <edumazet@google.com>2013-04-29 12:39:56 +0400
committerDavid S. Miller <davem@davemloft.net>2013-04-29 23:14:03 +0400
commit6a5dc9e598fe90160fee7de098fa319665f5253e (patch)
tree7f2c2130e3dec81aea01e997cec7e87744f02694 /net/ipv6/tcp_ipv6.c
parentf233a976ad15c3b8c54c0157f3c41d23f7514279 (diff)
downloadlinux-6a5dc9e598fe90160fee7de098fa319665f5253e.tar.xz
net: Add MIB counters for checksum errors
Add MIB counters for checksum errors in IP layer, and TCP/UDP/ICMP layers, to help diagnose problems. $ nstat -a | grep Csum IcmpInCsumErrors 72 0.0 TcpInCsumErrors 382 0.0 UdpInCsumErrors 463221 0.0 Icmp6InCsumErrors 75 0.0 Udp6InCsumErrors 173442 0.0 IpExtInCsumErrors 10884 0.0 Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index e51bd1a58264..71167069b394 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1405,6 +1405,7 @@ discard:
kfree_skb(skb);
return 0;
csum_err:
+ TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
goto discard;
@@ -1466,7 +1467,7 @@ static int tcp_v6_rcv(struct sk_buff *skb)
goto discard_it;
if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
- goto bad_packet;
+ goto csum_error;
th = tcp_hdr(skb);
hdr = ipv6_hdr(skb);
@@ -1530,6 +1531,8 @@ no_tcp_socket:
goto discard_it;
if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
+csum_error:
+ TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS);
bad_packet:
TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
} else {
@@ -1537,11 +1540,6 @@ bad_packet:
}
discard_it:
-
- /*
- * Discard frame
- */
-
kfree_skb(skb);
return 0;
@@ -1555,10 +1553,13 @@ do_time_wait:
goto discard_it;
}
- if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
- TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
+ if (skb->len < (th->doff<<2)) {
inet_twsk_put(inet_twsk(sk));
- goto discard_it;
+ goto bad_packet;
+ }
+ if (tcp_checksum_complete(skb)) {
+ inet_twsk_put(inet_twsk(sk));
+ goto csum_error;
}
switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {