[PATCH v4 1/3] net: ipv6: Add support for default gateway discovery.

[Tom Rini]

On Fri, Apr 21, 2023 at 05:08:21PM -0700, emohandesi at linux.microsoft.com wrote:

> From: Ehsan Mohandesi <emohandesi at linux.microsoft.com>
> 
> In IPv6, the default gateway and prefix length are determined by receiving
> a router advertisement as defined in -
> https://www.rfc-editor.org/rfc/rfc4861.
> 
> Add support for sending router solicitation (RS) and processing router
> advertisements (RA).
> 
> If the RA has prefix info option and following conditions are met, then
> gatewayip6 and net_prefix_length of ip6addr env variables are initialized.
> These are later consumed by IPv6 code for non-local destination IP.
> 
> - "Router Lifetime" != 0
> - Prefix is NOT link-local prefix (0xfe80::/10)
> - L flag is 1
> - "Valid Lifetime" != 0
> 
> Timing Parameters:
> - MAX_RTR_SOLICITATION_DELAY (0-1s)
> - RTR_SOLICITATION_INTERVAL (4s) (min retransmit delay)
> - MAX_RTR_SOLICITATIONS (3 RS transmissions)
> 
> The functionality is enabled by CONFIG_IPV6_ROUTER_DISCOVERY and invoked
> automatically from net_init_loop().
> 
> Signed-off-by: Ehsan Mohandesi <emohandesi at linux.microsoft.com>
> Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov at yadro.com>Reviewed-by: 
> Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov at yadro.com>
> Reviewed-by: Viacheslav Mitrofanov <v.v.mitrofanov at yadro.com>
> Tested-by: Sergei Antonov <saproj at gmail.com>
> Reviewed-by: Sergei Antonov <saproj at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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