Le 03/10/2019 à 18:19, Guillaume Nault a écrit :
[snip]

Why not using the existing NLM_F_ECHO mechanism?

IIUC, if rtnl_net_notifyid() did pass the proper nlmsghdr and portid to
rtnl_notify(), the later would automatically notify the caller with
updated information if the original request had the NLM_F_ECHO flag.

Good point. Note that with library like libnl, the auto sequence number check
will fail (seq number is 0 instead of the previous + 1) and thus must be bypassed.