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Harald Welte laforge at gnumonks.orgHi Jiannan, On Mon, Mar 27, 2017 at 05:16:10AM +0000, Jiannan Ouyang wrote: > According to > http://lxr.free-electrons.com/source/drivers/net/gtp.c#L937 and > https://github.com/RoadRunnr/osmo-ggsn/blob/master/libgtnl/src/gtp-genl.c#L73, > the NLM_F_EXCL flag is used to prevent updating an existing tunnel. > I’m is wondering what is the reason of preventing updating? As a minor side note: Please note the authoritative source for libgtpnl is at git.osmocom.org http://git.osmocom.org/libgtpnl/tree/src/gtp-genl.c To me it's quite obvious that a function called "gtp_add_tunnel()" should only add a new tunnel and hence I think the current behavior is correct. However, I guess you could simply submit a patch with "gtp_update_tunnel()" or "gtp_modify_tunnel()" which can modify an existing tunnel. The latter might probably be required anyway in other cases? -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)