Date: Mon, 9 Mar 2020 11:40:26 +0100 From: Michael Tuexen <michael.tuexen@lurchi.franken.de> To: Doug Hardie <bc979@lafn.org> Cc: freebsd-net@freebsd.org Subject: Re: SCTP sendmsgx Message-ID: <BF6123E9-89CB-4E67-9B8A-7927EFF2D7A0@lurchi.franken.de> In-Reply-To: <1C234055-9CDD-4A72-A027-1BD4F8A2FC71@mail.sermon-archive.info> References: <1C234055-9CDD-4A72-A027-1BD4F8A2FC71@mail.sermon-archive.info>
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> On 9. Mar 2020, at 11:01, Doug Hardie <bc979@lafn.org> wrote: > >> I am trying to get sctp_sendmsgx to work and not having a lot of success. I have not been able to find any examples on the web of using it. I have a client using sctp_sendmsg working fine. I need to make use of the multihoming feature which requires sctp_sendmsgx. I changed the call to sctp_sendmsgx, and changed the address count to 2. However, all I get is an EINVAL response. Looking through the code there are at least 2 different possible causes, but I can't distinguish between them. I do have two address structures in the address field. Are there any examples of how to build a client with sctp_sendmsgx? > > I am now making some progress. If you are using the sctp_sendmsg function the sa_len or sin_len field is not used. However, sctp_sendx does use it. Leaving it at zero causes Yepp, filling out the sa_len field is important. > the problem. sendx now sends a connection init to the remote host. There is no server running there yet. It hangs for quite some time and doesn't try the multihome address. I seem to recall reading something about that so will investigate that tomorrow. What do you see on the wire? I would expect INIT chunks to be sent to the two addresses you provided. Please note that sctp_sendx() is deprecated (like sctp_sendmsg()). Please consider using sctp_sendv(). See https://tools.ietf.org/html/rfc6458#section-9.12 Best regards Michael > > -- Doug > > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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