On Sunday 24 October 2004 05:51 am, Thanh Tra LUU wrote:
> hi,
>
> I try to answer as i know.
>
> > Yes another fight in my netlink saga. Thanks to all who have replied
>
> before
>
> > and I have learned alot from the rfc's and zebra/iproute and have
>
> contructed
>
> > a much more robust implementation. I have sent the kernel a message
>
> defined
>
> > as below. However I have not learned what exactly I should be expecting
>
> from
>
> > the kernel. That is, my message gets a reply from the kernel about eth0,
> > however on my machine i have eth0,1,2,ppp0 and I would like information
>
> about
>
> > them all. I have NLM_F_ROOT set on the packet as I was under the
>
> impression
>
> > that this would dump information about all the interfaces. I have also
>
> tried
>
> > incrementing msg.info.ifi_index to 0,1,2,3 etc. No matter what these
>
> values
>
> > I always recieve this output form my program.
> >
> > #./nl_test_prog
> > Found device: eth0 - 1
> > Found address: <--(Dont care about blank yet, main problem is
>
> only
>
> > 1 if shows. This is minor)
> >
> > -Am I wrong to expect the kernel to send me data about all the
> > interfaces? -Am I calling this wrong?
> > -What can I do to query all the interfaces?
>
> i've checked your code, it's all right. if you want to receive the
> information of all interfaces, you should use the rtgenmsg as follows:
>
> struct {
> struct nlmsghdr nlh;
> struct rtgenmsg r;
> } req;
>
> and then you fill the nlh as you did and set req.r.rtgen_family=AF_UNSPEC.
I tried this and it produced the same output. :(
> Otherwise, you can send msg to receive the information concerning each
> interface that you know the interface name or index as you did.
But when I tried specifying different indexes, all the way up to 32 even, it
still printed out information for eth0. And how would I send a packet
requesting "eth0"? I only see a place in the info struct specify the index
and not any strings.
>
> IMHO, to know exactly the address of the hardware, you can determine the
> length of the address by using :
> case IFLA_ADDRESS: len=RTA_PAYLOAD(rta); // don't try to printf all the
> string that you dont know where it ends.
I am posting to LKML and seeing if anything comes of it. I am sure I am just
missing some little thing. Perhaps if I can't figure it out I will post my
full code again. (Much revised since first post in this thread) Thank you for
your help.
----------------------------------------
EB
> All is fine except that I can reliably "oops" it simply by trying to read
> from /proc/apm (e.g. cat /proc/apm).
> oops output and ksymoops-2.3.4 output is attached.
> Is there anything else I can contribute?
The latitude and longtitude of the bios writers current position, and
a ballistic missile.
--Alan Cox LKML-December 08,2000
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