[IPV4]: Add ICMPMsgStats MIB (RFC 4293)

Background: RFC 4293 deprecates existing individual, named ICMP
type counters to be replaced with the ICMPMsgStatsTable. This table
includes entries for both IPv4 and IPv6, and requires counting of all
ICMP types, whether or not the machine implements the type.

These patches "remove" (but not really) the existing counters, and
replace them with the ICMPMsgStats tables for v4 and v6.
It includes the named counters in the /proc places they were, but gets the
values for them from the new tables. It also counts packets generated
from raw socket output (e.g., OutEchoes, MLD queries, RA's from
radvd, etc).

Changes:
1) create icmpmsg_statistics mib
2) create icmpv6msg_statistics mib
3) modify existing counters to use these
4) modify /proc/net/snmp to add "IcmpMsg" with all ICMP types
        listed by number for easy SNMP parsing
5) modify /proc/net/snmp printing for "Icmp" to get the named data
        from new counters.

Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index e594a2c89661..621b128897d7 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1302,6 +1302,10 @@ static int __init init_ipv4_mibs(void)
                           sizeof(struct icmp_mib),
                           __alignof__(struct icmp_mib)) < 0)
                 goto err_icmp_mib;
+        if (snmp_mib_init((void **)icmpmsg_statistics,
+                          sizeof(struct icmpmsg_mib),
+                          __alignof__(struct icmpmsg_mib)) < 0)
+                goto err_icmpmsg_mib;
         if (snmp_mib_init((void **)tcp_statistics,
                           sizeof(struct tcp_mib),
                           __alignof__(struct tcp_mib)) < 0)
@@ -1324,6 +1328,8 @@ err_udplite_mib:
 err_udp_mib:
         snmp_mib_free((void **)tcp_statistics);
 err_tcp_mib:
+        snmp_mib_free((void **)icmpmsg_statistics);
+err_icmpmsg_mib:
         snmp_mib_free((void **)icmp_statistics);
 err_icmp_mib:
         snmp_mib_free((void **)ip_statistics);