On Thu, 17 Jul 2008 00:35:22 +0200
Johannes Berg <[EMAIL PROTECTED]> wrote:
>
> > > (By the way, most uses of rtnl_* seems to be if (rtnl_* < 0) exit(1); in
> > > iproute2 currently. The error messages are in libnetlink.)
>
> > The problem is the driver is responding with an error packet but the
> > errno is 0. This looks like a kernel bug, not an library bug.
>
> I don't think so, the recvmsg() call worked fine, but the message
> indicates that the netlink consumer had an error. Or am I missing
> something?
>
> johannes
The netlink message in question is marked as type ERROR but the errno
encoded in the message is zero.
if (h->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
if (l < sizeof(struct nlmsgerr)) {
fprintf(stderr, "ERROR truncated\n");
} else {
errno = -err->error;
if (errno == 0) {
if (answer)
memcpy(answer, h, h->nlmsg_len);
return 0;
}
perror("RTNETLINK answers");
}
So the netlink library just treats as a successful return.
To me it looks like the problem is in the kernel sending back
a NLMSG_ERROR with errno of zero. Some code path isn't setting
it up properly.
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