Well.. before you can finish this work we need to decide upon what the
interface to userspace will be.
- The miscdev isn't appropriate
Why isn't miscdev appropriate?
We just shouldn't use miscdev for networking conventionally?
Yes it's rather odd, especially for networking.
What does the miscdev _do_ anyway? Is it purely a target for the ioctls?
Yes, I purely use miscdev for the ioctls.
I want to use sysfs and ioctl to implement the dynamic configurabillity.
The sysfs shows/changes netconsole configurations(IP address, port and so on).
A userland application using the ioctl adds/removes netconsole port.
I thought that the dynamic configurability could be realized without a
userland application. in the kernel only.
(e.g. only sysfs, no userland application)
But I think we need the function to automatically resolve the destination
MAC address from IP address because of the resolving cost and
I should implement a userland application, not netconsole kernel module.
The netconsle will become more useful by implementing the above function.
Some other speculations:
1. Would it be possible to add ioctl's to /dev/console? This would be more in
keeping with older Unix style model.
2. Using sysfs makes sense if there is a device object that exists to
add the sysfs attributes to.
3. Procfs is handy for summary type tables.
4. Netlink does feel like overkill for this. Although newer generic netlink
makes it easier.
If I use sysfs, Is it proper location that adds each attributes of netconsole
port in "/sys/class/misc/netconsole/port[0-9]*", or another locations in /sys/?
Stephen Hemminger said "The configuration of netconsole's looks like the
configuration of routes".
I think so too.
So I think ioctl commands for adding/removing port and the following userland
application like route(8) command by using the ioctl.
e.g.
1. add port
# netconfig add 192.168.0.10 6666
2. remove port
# netconfig remove 1
3. show port info
# netconfig
id status Source IP Source Port Destination IP Destination Port Destination MAC
1 enable 192.168.0.1 6665 192.168.0.10 6666 00:11:22:33:44:55
2 disable 192.168.0.1 6665 192.168.0.20 6666 00:11:22:33:44:66
route(8) command uses ioctl for Netlink.
But, I'm going to implement ioctl's to /dev/console because of the above comments.
Thank you for your comments.
Any comments very welcome.
--
Keiichi KII
NEC Corporation OSS Promotion Center
E-mail: [email protected]
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