Re: [PATCH net-next] net: ipv6: addrconf: Add accept_ra_prefix_route.

On 2021-03-10 12:28, David Ahern wrote:

On 3/10/21 11:49 AM, Subash Abhinov Kasiviswanathan wrote:

quoted

Added new procfs flag to toggle the automatic addition of prefix
routes on a per device basis. The new flag is accept_ra_prefix_route.

A value of 0 for the flag maybe used in some forwarding scenarios
when a userspace daemon is managing the routing.
Manual deletion of the kernel installed route was not sufficient as
kernel was adding back the route.

Defaults to 1 as to not break existing behavior.

Signed-off-by: Subash Abhinov Kasiviswanathan 
[off-list ref]
---
 Documentation/networking/ip-sysctl.rst | 10 ++++++++++
 include/linux/ipv6.h                   |  1 +
 include/uapi/linux/ipv6.h              |  1 +
 net/ipv6/addrconf.c                    | 16 +++++++++++++---
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.rst

b/Documentation/networking/ip-sysctl.rst
index c7952ac..9f0d92d 100644

--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst

@@ -2022,6 +2022,16 @@ accept_ra_mtu - BOOLEAN
 		- enabled if accept_ra is enabled.
 		- disabled if accept_ra is disabled.

+accept_ra_prefix_route - BOOLEAN
+	Apply the prefix route based on the RA. If disabled, kernel
+	does not install the route. This can be used if a userspace
+	daemon is managing the routing.
+
+	Functional default:
+
+		- enabled if accept_ra_prefix_route is enabled
+		- disabled if accept_ra_prefix_route is disabled
+
 accept_redirects - BOOLEAN
 	Accept Redirects.

this seems to duplicate accept_ra_pinfo

Thanks David. We will try out that entry instead and check.