icmp: Add counters for rate limits

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2155801
Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git

commit d094113
Author: Jamie Bainbridge <jamie.bainbridge@gmail.com>
Date:   Wed Jan 25 11:16:52 2023 +1100

    icmp: Add counters for rate limits

    There are multiple ICMP rate limiting mechanisms:

    * Global limits: net.ipv4.icmp_msgs_burst/icmp_msgs_per_sec
    * v4 per-host limits: net.ipv4.icmp_ratelimit/ratemask
    * v6 per-host limits: net.ipv6.icmp_ratelimit/ratemask

    However, when ICMP output is limited, there is no way to tell
    which limit has been hit or even if the limits are responsible
    for the lack of ICMP output.

    Add counters for each of the cases above. As we are within
    local_bh_disable(), use the __INC stats variant.

    Example output:

     # nstat -sz "*RateLimit*"
     IcmpOutRateLimitGlobal          134                0.0
     IcmpOutRateLimitHost            770                0.0
     Icmp6OutRateLimitHost           84                 0.0

    Signed-off-by: Jamie Bainbridge <jamie.bainbridge@gmail.com>
    Suggested-by: Abhishek Rawal <rawal.abhishek92@gmail.com>
    Link: https://lore.kernel.org/r/273b32241e6b7fdc5c609e6f5ebc68caf3994342.1674605770.git.jamie.bainbridge@gmail.com
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Jamie Bainbridge <jbainbri@redhat.com>

Author: jbainbri

include/uapi/linux/snmp.h

@@ -95,6 +95,8 @@ enum
 	ICMP_MIB_OUTADDRMASKS,			/* OutAddrMasks */
 	ICMP_MIB_OUTADDRMASKREPS,		/* OutAddrMaskReps */
 	ICMP_MIB_CSUMERRORS,			/* InCsumErrors */
+	ICMP_MIB_RATELIMITGLOBAL,		/* OutRateLimitGlobal */
+	ICMP_MIB_RATELIMITHOST,			/* OutRateLimitHost */
 	__ICMP_MIB_MAX
 };
 
@@ -112,6 +114,7 @@ enum
 	ICMP6_MIB_OUTMSGS,			/* OutMsgs */
 	ICMP6_MIB_OUTERRORS,			/* OutErrors */
 	ICMP6_MIB_CSUMERRORS,			/* InCsumErrors */
+	ICMP6_MIB_RATELIMITHOST,		/* OutRateLimitHost */
 	__ICMP6_MIB_MAX
 };
 

net/ipv4/icmp.c

@@ -296,6 +296,7 @@ static bool icmpv4_global_allow(struct net *net, int type, int code)
 	if (icmp_global_allow())
 		return true;
 
+	__ICMP_INC_STATS(net, ICMP_MIB_RATELIMITGLOBAL);
 	return false;
 }
 
@@ -325,6 +326,8 @@ static bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
 	if (peer)
 		inet_putpeer(peer);
 out:
+	if (!rc)
+		__ICMP_INC_STATS(net, ICMP_MIB_RATELIMITHOST);
 	return rc;
 }
 

net/ipv4/proc.c

@@ -352,7 +352,7 @@ static void icmp_put(struct seq_file *seq)
 	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
 	for (i = 0; icmpmibmap[i].name; i++)
 		seq_printf(seq, " In%s", icmpmibmap[i].name);
-	seq_puts(seq, " OutMsgs OutErrors");
+	seq_puts(seq, " OutMsgs OutErrors OutRateLimitGlobal OutRateLimitHost");
 	for (i = 0; icmpmibmap[i].name; i++)
 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
 	seq_printf(seq, "\nIcmp: %lu %lu %lu",
@@ -362,9 +362,11 @@ static void icmp_put(struct seq_file *seq)
 	for (i = 0; icmpmibmap[i].name; i++)
 		seq_printf(seq, " %lu",
 			   atomic_long_read(ptr + icmpmibmap[i].index));
-	seq_printf(seq, " %lu %lu",
+	seq_printf(seq, " %lu %lu %lu %lu",
 		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
-		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_RATELIMITGLOBAL),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_RATELIMITHOST));
 	for (i = 0; icmpmibmap[i].name; i++)
 		seq_printf(seq, " %lu",
 			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));

net/ipv6/icmp.c

@@ -190,6 +190,7 @@ static bool icmpv6_global_allow(struct net *net, int type)
 	if (icmp_global_allow())
 		return true;
 
+	__ICMP_INC_STATS(net, ICMP_MIB_RATELIMITGLOBAL);
 	return false;
 }
 
@@ -231,6 +232,9 @@ static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
 		if (peer)
 			inet_putpeer(peer);
 	}
+	if (!res)
+		__ICMP6_INC_STATS(net, ip6_dst_idev(dst),
+				  ICMP6_MIB_RATELIMITHOST);
 	dst_release(dst);
 	return res;
 }

net/ipv6/proc.c

@@ -94,6 +94,7 @@ static const struct snmp_mib snmp6_icmp6_list[] = {
 	SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
 	SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
 	SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
+	SNMP_MIB_ITEM("Icmp6OutRateLimitHost", ICMP6_MIB_RATELIMITHOST),
 	SNMP_MIB_SENTINEL
 };