Date: Wed, 1 Aug 2001 13:01:12 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Thomas Pornin <Thomas.Pornin@ens.fr> Cc: freebsd-net@freebsd.org, freebsd-alpha@freebsd.org Subject: Re: PPPoE + Alpha + 32/64 bits Message-ID: <Pine.BSF.4.21.0108011243090.35786-100000@InterJet.elischer.org> In-Reply-To: <20010801173624.A13674@bolet.ens.fr>
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can you send us a patch that works for you? we can make it #ifdef __Alpha__ or something. can you ocnfirm that the outgoing packet has a tag-lenth of '8' and that teh return tag has a length of '4'? (maybe 9 and 5) sounds like a brain-dead router at the other end.. On Wed, 1 Aug 2001, Thomas Pornin wrote: > Hello, > > I recently connected my FreeBSD/Alpha (4.3-RELEASE) to an ADSL link > using an Alcatel Speed Touch Home modem. As is, it was not working; > after some digging, I found that there is a bug either in the ng_pppoe > support, or in the modem. > > The problem is in the pppoe_finduniq() function. In order to identify > sessions, the PPPoE code sends a tag with the first packet it sends to > the modem; this tag is in fact a 64-bit pointer to some data structure > in kernel space. When a packet of type PADO_CODE or PADS_CODE is > received, the tag is compared with known pointers. > > However, only 32 bits are present in the return tag. So, if the original > pointer is 0xfffffc00003b3d00, the tag contains only 0x003b3d00, which > are the first four bytes of data (in little-endian representation). If > I modify the pppoe_finduniq() function to accept matches on these four > bytes, the connection is established, and remains fully functionnal > afterwards. > > Some details: The Alpha is little-endian, but the data in the packets is > big-endian. If the original pointer is 0xfffffc00003b3d00, the rebuilt > tag from the response packet is actually 0x003b3d0000000000. I do not > know if the 8-bytes tag is sent correctly, or if the modem is buggy, or > whatever. > > Machine configuration: > AXPpci33 at 166 MHz, 32 MB ram > ethernet PCI adapter RealTek 8029 10baseT (ed0) > modem Alcatel Speed Touch Home (ethernet) > FreeBSD 4.3-RELEASE (with a small patch to enable ed0) > > Feel free to ask for any detail. > > > --Thomas Pornin > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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