[lwip-devel] [bug #20409] Add netif callback function for link change event

[Frédéric Bernon]

Follow-up Comment #24, bug #20409 (project lwip):

Comment#21

I think the "gratuitous ARP " have to be send as soon as possible to inform
network switch, so call it in a synchrone way (like in current code) is
better.

About flags, I think that LINK_UP is enough: each module working during the
interface is "down" should handle that in it's states: if when it check an
interface, it is LINK DOWN, it have to do the "right changes" in its internal
states (for DHCP, come to DHCP_OFF, and reset some fields like in a part of
dhcp_release, for AUTOIP, change to AUTOIP_STATE_OFF, etc...). Perhaps add
some specific states for these modules is necessary (add a DHCP_LINKDOWN,
etc...), so, when they check netif's flags, and now, the LINK UP, they can
also do the "right things" (restart for DHCP/AUTOIP, send the ARP gratuitous,
resend group for IGMP...)


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