[PATCH 4.11 22/84] net: dont global ICMP rate limit packets originating from loopback

From: Greg Kroah-Hartman
Date: Mon Jul 03 2017 - 10:04:59 EST

4.11-stable review patch. If anyone has any objections, please let me know.


From: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>

[ Upstream commit 849a44de91636c24cea799cb8ad8c36433feb913 ]

Florian Weimer seems to have a glibc test-case which requires that
loopback interfaces does not get ICMP ratelimited. This was broken by
commit c0303efeab73 ("net: reduce cycles spend on ICMP replies that
gets rate limited").

An ICMP response will usually be routed back-out the same incoming
interface. Thus, take advantage of this and skip global ICMP
ratelimit when the incoming device is loopback. In the unlikely event
that the outgoing it not loopback, due to strange routing policy
rules, ICMP rate limiting still works via peer ratelimiting via
icmpv4_xrlim_allow(). Thus, we should still comply with RFC1812
(section "Rate Limiting").

This seems to fix the reproducer given by Florian. While still
avoiding to perform expensive and unneeded outgoing route lookup for
rate limited packets (in the non-loopback case).

Fixes: c0303efeab73 ("net: reduce cycles spend on ICMP replies that gets rate limited")
Reported-by: Florian Weimer <fweimer@xxxxxxxxxx>
Reported-by: "H.J. Lu" <hjl.tools@xxxxxxxxx>
Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/ipv4/icmp.c | 8 ++++++--
net/ipv6/icmp.c | 2 +-
2 files changed, 7 insertions(+), 3 deletions(-)

--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -674,8 +674,12 @@ void icmp_send(struct sk_buff *skb_in, i
/* Needed by both icmp_global_allow and icmp_xmit_lock */

- /* Check global sysctl_icmp_msgs_per_sec ratelimit */
- if (!icmpv4_global_allow(net, type, code))
+ /* Check global sysctl_icmp_msgs_per_sec ratelimit, unless
+ * incoming dev is loopback. If outgoing dev change to not be
+ * loopback, then peer ratelimit still work (in icmpv4_xrlim_allow)
+ */
+ if (!(skb_in->dev && (skb_in->dev->flags&IFF_LOOPBACK)) &&
+ !icmpv4_global_allow(net, type, code))
goto out_bh_enable;

sk = icmp_xmit_lock(net);
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -491,7 +491,7 @@ static void icmp6_send(struct sk_buff *s

/* Check global sysctl_icmp_msgs_per_sec ratelimit */
- if (!icmpv6_global_allow(type))
+ if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type))
goto out_bh_enable;