This is a note to let you know that I've just added the patch titled
ipv4: fib: Fix metrics match when deleting a route
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv4-fib-fix-metrics-match-when-deleting-a-route.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Dec 31 11:12:48 CET 2017
From: Phil Sutter <phil@xxxxxx>
Date: Tue, 19 Dec 2017 15:17:13 +0100
Subject: ipv4: fib: Fix metrics match when deleting a route
From: Phil Sutter <phil@xxxxxx>
[ Upstream commit d03a45572efa068fa64db211d6d45222660e76c5 ]
The recently added fib_metrics_match() causes a regression for routes
with both RTAX_FEATURES and RTAX_CC_ALGO if the latter has
TCP_CONG_NEEDS_ECN flag set:
| # ip link add d0 type dummy
| # ip link set d0 up
| # ip route add 172.29.29.0/24 dev d0 features ecn congctl dctcp
| # ip route del 172.29.29.0/24 dev d0 features ecn congctl dctcp
| RTNETLINK answers: No such process
During route insertion, fib_convert_metrics() detects that the given CC
algo requires ECN and hence sets DST_FEATURE_ECN_CA bit in
RTAX_FEATURES.
During route deletion though, fib_metrics_match() compares stored
RTAX_FEATURES value with that from userspace (which obviously has no
knowledge about DST_FEATURE_ECN_CA) and fails.
Fixes: 5f9ae3d9e7e4a ("ipv4: do metrics match when looking up and deleting a route")
Signed-off-by: Phil Sutter <phil@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/fib_semantics.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -706,7 +706,7 @@ bool fib_metrics_match(struct fib_config
nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
int type = nla_type(nla);
- u32 val;
+ u32 fi_val, val;
if (!type)
continue;
@@ -723,7 +723,11 @@ bool fib_metrics_match(struct fib_config
val = nla_get_u32(nla);
}
- if (fi->fib_metrics->metrics[type - 1] != val)
+ fi_val = fi->fib_metrics->metrics[type - 1];
+ if (type == RTAX_FEATURES)
+ fi_val &= ~DST_FEATURE_ECN_CA;
+
+ if (fi_val != val)
return false;
}
Patches currently in stable-queue which might be from phil@xxxxxx are
queue-4.14/ipv4-fib-fix-metrics-match-when-deleting-a-route.patch