Commit 6a5dc9e5 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f233a976

include/uapi/linux/snmp.h

+5 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ enum 
	IPSTATS_MIB_OUTMCASTOCTETS,		/* OutMcastOctets */

	IPSTATS_MIB_INBCASTOCTETS,		/* InBcastOctets */

	IPSTATS_MIB_OUTBCASTOCTETS,		/* OutBcastOctets */

	IPSTATS_MIB_CSUMERRORS,			/* InCsumErrors */

	__IPSTATS_MIB_MAX

};
@@ -87,6 +88,7 @@ enum 
	ICMP_MIB_OUTTIMESTAMPREPS,		/* OutTimestampReps */

	ICMP_MIB_OUTADDRMASKS,			/* OutAddrMasks */

	ICMP_MIB_OUTADDRMASKREPS,		/* OutAddrMaskReps */

	ICMP_MIB_CSUMERRORS,			/* InCsumErrors */

	__ICMP_MIB_MAX

};
@@ -103,6 +105,7 @@ enum 
	ICMP6_MIB_INERRORS,			/* InErrors */

	ICMP6_MIB_OUTMSGS,			/* OutMsgs */

	ICMP6_MIB_OUTERRORS,			/* OutErrors */

	ICMP6_MIB_CSUMERRORS,			/* InCsumErrors */

	__ICMP6_MIB_MAX

};
@@ -130,6 +133,7 @@ enum 
	TCP_MIB_RETRANSSEGS,			/* RetransSegs */

	TCP_MIB_INERRS,				/* InErrs */

	TCP_MIB_OUTRSTS,			/* OutRsts */

	TCP_MIB_CSUMERRORS,			/* InCsumErrors */

	__TCP_MIB_MAX

};
@@ -147,6 +151,7 @@ enum 
	UDP_MIB_OUTDATAGRAMS,			/* OutDatagrams */

	UDP_MIB_RCVBUFERRORS,			/* RcvbufErrors */

	UDP_MIB_SNDBUFERRORS,			/* SndbufErrors */

	UDP_MIB_CSUMERRORS,			/* InCsumErrors */

	__UDP_MIB_MAX

};

net/ipv4/icmp.c

+3 −1
Original line number Diff line number Diff line
@@ -881,7 +881,7 @@ int icmp_rcv(struct sk_buff *skb) 
	case CHECKSUM_NONE:

		skb->csum = 0;

		if (__skb_checksum_complete(skb))

			goto error;

			goto csum_error;

	}



	if (!pskb_pull(skb, sizeof(*icmph)))
@@ -929,6 +929,8 @@ int icmp_rcv(struct sk_buff *skb) 
drop:

	kfree_skb(skb);

	return 0;

csum_error:

	ICMP_INC_STATS_BH(net, ICMP_MIB_CSUMERRORS);

error:

	ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);

	goto drop;

net/ipv4/ip_input.c

+3 −1
Original line number Diff line number Diff line
@@ -419,7 +419,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 
	iph = ip_hdr(skb);



	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))

		goto inhdr_error;

		goto csum_error;



	len = ntohs(iph->tot_len);

	if (skb->len < len) {
@@ -446,6 +446,8 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 
	return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, dev, NULL,

		       ip_rcv_finish);



csum_error:

	IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_CSUMERRORS);

inhdr_error:

	IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS);

drop:

net/ipv4/proc.c

+7 −3
Original line number Diff line number Diff line
@@ -125,6 +125,7 @@ static const struct snmp_mib snmp4_ipextstats_list[] = { 
	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),

	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),

	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),

	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),

	SNMP_MIB_SENTINEL

};
@@ -162,6 +163,7 @@ static const struct snmp_mib snmp4_tcp_list[] = { 
	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),

	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),

	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),

	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),

	SNMP_MIB_SENTINEL

};
@@ -172,6 +174,7 @@ static const struct snmp_mib snmp4_udp_list[] = { 
	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),

	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),

	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),

	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),

	SNMP_MIB_SENTINEL

};
@@ -322,15 +325,16 @@ static void icmp_put(struct seq_file *seq) 
	struct net *net = seq->private;

	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;



	seq_puts(seq, "\nIcmp: InMsgs InErrors");

	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");

	for (i=0; icmpmibmap[i].name != NULL; i++)

		seq_printf(seq, " In%s", icmpmibmap[i].name);

	seq_printf(seq, " OutMsgs OutErrors");

	for (i=0; icmpmibmap[i].name != NULL; i++)

		seq_printf(seq, " Out%s", icmpmibmap[i].name);

	seq_printf(seq, "\nIcmp: %lu %lu",

	seq_printf(seq, "\nIcmp: %lu %lu %lu",

		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),

		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));

		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS),

		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));

	for (i=0; icmpmibmap[i].name != NULL; i++)

		seq_printf(seq, " %lu",

			   atomic_long_read(ptr + icmpmibmap[i].index));

net/ipv4/tcp_input.c

+1 −0
Original line number Diff line number Diff line
@@ -5273,6 +5273,7 @@ step5: 
	return 0;



csum_error:

	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);

	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);



discard:

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