support linux altname

[calvin2021y]

IFLA_ALT_IFNAME is not used.

rtnl_link_get_by_name with altname will return not exits.

[calvin2021y]

@thom311

Can you give some tips about how to do it?

[thom311]

First, libnl3 needs to learn about altnames and the struct rtnl_link needs to expose those (an rtnl_link_get_altnames() akin to rtnl_link_get_name())

The netlink attribute is called IFLA_ALT_IFNAME. In sense, it is similar to IFLA_IFNAME. Search libnl3 for IFLA_IFNAME.

The major difference is that the IFLA_ALT_IFNAME attribute can appear multiple times and there can be any number of altnames.

I'd look at IFLA_ALT_IFNAME in kernel, iproute2 and systemd projects, to see how they handle that.