[OpenWrt-Devel] [netifd][PATCH] interface-ip: transfer prefix route ownership to kernel when IPv6 address becomes deprecated

[Alin Nastac]

From: Alin Nastac <alin.nastac at gmail.com>

When netifd manages the prefix route directly, it will remove it
the moment prefix gets deprecated. This will make it impossible
for the target to send ICMPv6 errors back to LAN devices still
using the deprecated prefix, thus breaking the L-14 requirement
of RFC 7084.

Signed-off-by: Alin Nastac <alin.nastac at gmail.com>
---
 interface-ip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/interface-ip.c b/interface-ip.c
index 91c305b..ff8f219 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -913,7 +913,7 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
 
 	addr.addr.in6 = assignment->addr;
 	addr.mask = assignment->length;
-	addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
+	addr.flags = DEVADDR_INET6;
 	addr.preferred_until = prefix->preferred_until;
 	addr.valid_until = prefix->valid_until;
 
@@ -960,6 +960,7 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
 			route.addr = addr.addr;
 		}
 
+		addr.flags |= DEVADDR_OFFLINK;
 		if (system_add_address(l3_downlink, &addr))
 			return;
 
-- 
2.7.4


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