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Reintroduce IPv6 reachability probe patch for RPi lost after refactoring (#3389)

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* Reintroduce IPv6 reachability probe patch for RPi lost after refactoring

In #3384 we moved the patches around, which results in version-specific
patches not applied for RPi linux-custom build. Copy the missing IPv6
reachability probe patch to the RPi patches directory.

* Only copy IPv6 reachability probe patch to top-level linux patches

Instead of copying the patch to RPi directory and renumbering the
patches, only copy it upper level so it's applied for all linux versions
other than 6.6.31.
This commit is contained in:
Jan Čermák 2024-05-24 09:30:07 +02:00 committed by GitHub
parent 8dbc03cc76
commit 2c725d90f6
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1 changed files with 52 additions and 0 deletions
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52
buildroot-external/patches/linux/0001-ipv6-add-option-to-explicitly-enable-reachability-te.patch Normal file
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@ -0,0 +1,52 @@
From 76591e4075194cf717dc085b8285912f706bcd46 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Tue, 28 Mar 2023 12:02:10 +0200
Subject: [PATCH] ipv6: add option to explicitly enable reachability test
Systems which act as host as well as router might prefer the host
behavior. Currently the kernel does not allow to use IPv6 forwarding
globally and at the same time use route reachability probing.
Add a compile time flag to enable route reachability probe in any
case.
Signed-off-by: Stefan Agner <stefan@agner.ch>
---
net/ipv6/Kconfig | 9 +++++++++
net/ipv6/route.c | 3 ++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 08d4b7132d4c..242bf2eeb7ae 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -48,6 +48,15 @@ config IPV6_OPTIMISTIC_DAD
If unsure, say N.
+config IPV6_REACHABILITY_PROBE
+ bool "IPv6: Always use reachability probing (RFC 4191)"
+ help
+ By default reachability probing is disabled on router devices (when
+ IPv6 forwarding is enabled). This option explicitly enables
+ reachability probing always.
+
+ If unsure, say N.
+
config INET6_AH
tristate "IPv6: AH transformation"
select XFRM_AH
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 56525b5b95a2..916769b9a772 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2211,7 +2211,8 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
strict |= flags & RT6_LOOKUP_F_IFACE;
strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
- if (net->ipv6.devconf_all->forwarding == 0)
+ if (net->ipv6.devconf_all->forwarding == 0 ||
+ IS_ENABLED(CONFIG_IPV6_REACHABILITY_PROBE))
strict |= RT6_LOOKUP_F_REACHABLE;
rcu_read_lock();