r-vdp
62feba20aa
When the periodic RA timer fires, any error returned by sendmsg() currently propagates up through sd_radv_send() into radv_timeout(), which then calls sd_radv_stop(). The RA engine is never started again until the next carrier transition. On an 802.3ad bond there is a window right after carrier-up where the link is administratively up but no aggregator has been selected yet, so sendmsg() returns ENOBUFS. If the very first RA after a flap lands in that window, radv stops permanently and all clients lose their SLAAC addresses, on-link/PD prefixes, and default router once the previously advertised lifetimes expire, while IPv4 keeps working, leading to a very confusing situation with v4 up and v6 down. Handle this the same way solicited RAs already do (see radv_process_packet()): log the failure and reschedule the timer instead of giving up. ra_sent is left untouched on failure so we stay in the fast initial-advertisement regime until a send actually succeeds.
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