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2023-05-05net: ipv6: Add support for default gateway discovery.Ehsan Mohandesi
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>
2022-12-05net: ipv6: Add Neighbor Discovery Protocol (NDP)Viacheslav Mitrofanov
Implement basic of NDP. It doesn't include such things as Router Solicitation, Router Advertisement and Redirect. It just has Neighbor Solicitation and Neighbor Advertisement. Only these two features are used in u-boot IPv6. Implementation of some NDP functions uses API that was exposed in "net: ipv6: Add IPv6 basic primitives". Also this patch inlcudes update in Makefile to build NDP. Series-changes: 3 - Added structures and functions descriptions - Fixed style problems Series-changes: 4 - Fixed structures and functions description style Signed-off-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>