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| author | Jamie Bainbridge <jamie.bainbridge@gmail.com> | 2023-01-25 11:16:52 +1100 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-01-26 10:52:18 +0100 |
| commit | d0941130c93515411c8d66fc22bdae407b509a6d (patch) | |
| tree | e957d0231552d670cb9d36ef072c2d5b301a6e1e /net/ipv6/icmp.c | |
| parent | 9f92752788d719a4978d31082c98300274dd6ffc (diff) | |
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>
Diffstat (limited to 'net/ipv6/icmp.c')
| -rw-r--r-- | net/ipv6/icmp.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index 9d92d51c4757..79c769c0d113 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -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; } |