Dave,
What do you mean by: "The Transparent Mode"?
I don't have time to give you the cookbook, but if you look at the ldl driver (and, who knows, perhaps even its documentation) there are different modes of operation that are controlled by how you do the dl_attach. One is a transparent mode in which your driver gets to see all of the incoming Ethernet packets.
-- Dave
tim
Dave Grothe wrote:
I have been using the transparent mode in order to avoid this kind of thing. My driver does its own filtering of addresses and SAPs.
-- Dave
At 09:33 AM 9/16/2004, Tim Brown wrote:
I am porting some network multiplexor software which uses multiplexes
messages between hosts and processes on hosts using 802.2 DSAP/SSAP
addressing.
I bind onto a DSAP, allowing me to listen for Ethernet frames addressed
to me. Within those packets is the return address for me to send my replies
to. This may or may not be the Ethernet address of the sender.
I then wish to send a frame to the destination which may have an arbitrary
DSAP. However, in eth_8022_mkhdr() in drivers/str/linux/ldl.c line:1704
if (dsap != dl->sap->sap.sap[0]) {
struct sap *sap;
for (sap = dl->subs; sap; sap = sap->next_sap)
if (dsap == sap->sap.sap[0])
break;
if (sap == NULL)
return 0;
}
i.e. if you are not bound to "dsap", or have an additional binding
to "dsap", then the message isn't sent.
I am using LiS 2.17.U.
I don't believe this behaviour is correct, since it is inconsistent
with the Solaris and AIX DLPI drivers, as well as the understanding
of most people here of how DSAP/SSAP addressing works; i.e. you bind
onto and listen on a DSAP (or multiple DSAPs), but any process on any
station can transmit to any of the available SSAPs.
Therefore, I don't believe there is any reason for this code. Is there?
Regards,
Tim
--
Tim Brown <[EMAIL PROTECTED]> | City Computing Limited |
T: +44 20 8770 2110 | City House, Sutton Park Road |
F: +44 20 8770 2130 | Sutton, Surrey, SM1 2AE, GB |
BEAUTY: What's in your eye when you have a bee in your hand.__________/
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--
Tim Brown <[EMAIL PROTECTED]> | City Computing Limited |
T: +44 20 8770 2110 | City House, Sutton Park Road |
F: +44 20 8770 2130 | Sutton, Surrey, SM1 2AE, GB |
BEAUTY: What's in your eye when you have a bee in your hand.__________/
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