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icmp: Add counters for rate limits

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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>
This commit is contained in:
Jamie Bainbridge 2023-01-25 11:16:52 +11:00 committed by Paolo Abeni
parent 9f92752788
commit d0941130c9
5 changed files with 16 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
include/uapi/linux/snmp.h
View file

@ -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
};

3
net/ipv4/icmp.c
View file

@ -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;
}

8
net/ipv4/proc.c
View file

@ -353,7 +353,7 @@ 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",
@ -363,9 +363,11 @@ 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)));

4
net/ipv6/icmp.c
View file

@ -183,6 +183,7 @@ 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;
}
@ -224,6 +225,9 @@ 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;
}

1
net/ipv6/proc.c
View file

@ -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
};