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kernel: Fix kernel regression in local-broadcast routes

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Backport a patch from upstream kernel 6.17-rc4 which fixes a regression
introduced in the latest stable kernel versions.

This is already in the Linus stable queues for the next minor kernel
updates.

Fixes: 1c92e468d5 ("kernel: bump 6.6 to 6.6.103")
Fixes: f39c7e103f ("kernel: bump 6.12 to 6.12.43")
Reported-by: Goetz Goerisch <ggoerisch@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Hauke Mehrtens 2025-09-01 23:11:02 +02:00 committed by Felix Fietkau
parent 41aceb2de8
commit c589fb7baf
2 changed files with 94 additions and 0 deletions
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47
target/linux/generic/backport-6.12/626-v6.17-net-ipv4-fix-regression-in-local-broadcast-routes.patch Normal file
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@ -0,0 +1,47 @@
From 5189446ba995556eaa3755a6e875bc06675b88bd Mon Sep 17 00:00:00 2001
From: Oscar Maes <oscmaes92@gmail.com>
Date: Wed, 27 Aug 2025 08:23:21 +0200
Subject: [PATCH] net: ipv4: fix regression in local-broadcast routes
Commit 9e30ecf23b1b ("net: ipv4: fix incorrect MTU in broadcast routes")
introduced a regression where local-broadcast packets would have their
gateway set in __mkroute_output, which was caused by fi = NULL being
removed.
Fix this by resetting the fib_info for local-broadcast packets. This
preserves the intended changes for directed-broadcast packets.
Cc: stable@vger.kernel.org
Fixes: 9e30ecf23b1b ("net: ipv4: fix incorrect MTU in broadcast routes")
Reported-by: Brett A C Sheffield <bacs@librecast.net>
Closes: https://lore.kernel.org/regressions/20250822165231.4353-4-bacs@librecast.net
Signed-off-by: Oscar Maes <oscmaes92@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250827062322.4807-1-oscmaes92@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
net/ipv4/route.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2532,12 +2532,16 @@ static struct rtable *__mkroute_output(c
!netif_is_l3_master(dev_out))
return ERR_PTR(-EINVAL);
- if (ipv4_is_lbcast(fl4->daddr))
+ if (ipv4_is_lbcast(fl4->daddr)) {
type = RTN_BROADCAST;
- else if (ipv4_is_multicast(fl4->daddr))
+
+ /* reset fi to prevent gateway resolution */
+ fi = NULL;
+ } else if (ipv4_is_multicast(fl4->daddr)) {
type = RTN_MULTICAST;
- else if (ipv4_is_zeronet(fl4->daddr))
+ } else if (ipv4_is_zeronet(fl4->daddr)) {
return ERR_PTR(-EINVAL);
+ }
if (dev_out->flags & IFF_LOOPBACK)
flags |= RTCF_LOCAL;

47
target/linux/generic/backport-6.6/626-v6.17-net-ipv4-fix-regression-in-local-broadcast-routes.patch Normal file
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@ -0,0 +1,47 @@
From 5189446ba995556eaa3755a6e875bc06675b88bd Mon Sep 17 00:00:00 2001
From: Oscar Maes <oscmaes92@gmail.com>
Date: Wed, 27 Aug 2025 08:23:21 +0200
Subject: [PATCH] net: ipv4: fix regression in local-broadcast routes
Commit 9e30ecf23b1b ("net: ipv4: fix incorrect MTU in broadcast routes")
introduced a regression where local-broadcast packets would have their
gateway set in __mkroute_output, which was caused by fi = NULL being
removed.
Fix this by resetting the fib_info for local-broadcast packets. This
preserves the intended changes for directed-broadcast packets.
Cc: stable@vger.kernel.org
Fixes: 9e30ecf23b1b ("net: ipv4: fix incorrect MTU in broadcast routes")
Reported-by: Brett A C Sheffield <bacs@librecast.net>
Closes: https://lore.kernel.org/regressions/20250822165231.4353-4-bacs@librecast.net
Signed-off-by: Oscar Maes <oscmaes92@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250827062322.4807-1-oscmaes92@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
net/ipv4/route.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2547,12 +2547,16 @@ static struct rtable *__mkroute_output(c
!netif_is_l3_master(dev_out))
return ERR_PTR(-EINVAL);
- if (ipv4_is_lbcast(fl4->daddr))
+ if (ipv4_is_lbcast(fl4->daddr)) {
type = RTN_BROADCAST;
- else if (ipv4_is_multicast(fl4->daddr))
+
+ /* reset fi to prevent gateway resolution */
+ fi = NULL;
+ } else if (ipv4_is_multicast(fl4->daddr)) {
type = RTN_MULTICAST;
- else if (ipv4_is_zeronet(fl4->daddr))
+ } else if (ipv4_is_zeronet(fl4->daddr)) {
return ERR_PTR(-EINVAL);
+ }
if (dev_out->flags & IFF_LOOPBACK)
flags |= RTCF_LOCAL;