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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@linux.microsoft.com> Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>Reviewed-by: Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com> Reviewed-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com> Tested-by: Sergei Antonov <saproj@gmail.com> Reviewed-by: Sergei Antonov <saproj@gmail.com>