icmp: Account for ICMP out errors

When ip_append() fails because of socket limit or memory shortage,
increment ICMP_MIB_OUTERRORS counter, so that "netstat -s" can report
these errors.

LANG=C netstat -s | grep "ICMP messages failed"
    0 ICMP messages failed

For IPV6, implement ICMP6_MIB_OUTERRORS counter as well.

# grep Icmp6OutErrors /proc/net/dev_snmp6/*
/proc/net/dev_snmp6/eth0:Icmp6OutErrors                   	0
/proc/net/dev_snmp6/lo:Icmp6OutErrors                   	0

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index d2a9aa3c6c88..52797714ade7 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -100,6 +100,7 @@ enum
         ICMP6_MIB_INMSGS,                       /* InMsgs */
         ICMP6_MIB_INERRORS,                     /* InErrors */
         ICMP6_MIB_OUTMSGS,                      /* OutMsgs */
+        ICMP6_MIB_OUTERRORS,                    /* OutErrors */
         __ICMP6_MIB_MAX
 };