Re: [RFC] cfg80211 and nl80211

[Dan Williams <dcbw@redhat.com>]

On Mon, 2006-10-02 at 12:15 -0400, Dan Williams wrote:
> On Thu, 2006-09-28 at 11:23 +0200, Johannes Berg wrote:
> > This patch adds cfg80211, a new configuration system for wireless hardware
> > as well as nl80211, the netlink-based userspace interface for it.
> > 
> > It currently features a bunch of configuration requests, support for
> > adding and removing virtual interfaces, the ability to inject packets and
> > more.
> > 
> > Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
> > ---
> > This is the
> > 
> >   I think nl80211 is the future if I don't have to do it all by myself
> >     -- johill
> > 
> > release. Please take the time to read at least the stuff before the patch.
> > 
> > There should be support for notifications, but that isn't currently done
> > as I'm still thinking about how to do it best.
> > 
> > It probably still requires the patches in
> > http://marc.theaimsgroup.com/?l=linux-netdev&m=115625436628696&w=2
> > and
> > http://marc.theaimsgroup.com/?l=linux-netdev&m=115625168405439&w=2
> > 
> > (the latter doesn't apply cleanly against wireless-dev, but you can
> > safely ignore the pieces that don't, at least for wireless testing :) )
> > 
> > It also requires the NLA_PUT_FLAG patch I did:
> > http://marc.theaimsgroup.com/?l=linux-netdev&m=115650333420169&w=2
> > 
> > (obviously, all those patches aren't required any more if they have been
> > applied, but I've been lazy and not tracked which are and which aren't)
> > 
> > I've removed the use of NLA_CUSTOM_CHECK as it isn't going to be applied,
> > but that currently results in a warning about an unused static method.
> > 
> > Also new in this iteration is a lot more fleshed-out internal cfg80211
> > interface. Also new is the following paragraph ;)
> > 
> > Here's an explanation of what cfg80211 and nl80211 are. cfg80211 is
> > the interface between the configuration backend and the driver or stack
> > ("users" of cfg80211). cfg80211 provides a wiphy index whenever a user
> > registers with it, and allows things to be enumerated etc. nl80211 is
> > currently the only interface between cfg80211 and userspace and will
> > most likely remain the primary interface forever, but it is possible
> > to add (for example) a configfs interface between userspace and cfg80211,
> > users of cfg80211 can remain blissfully unaware of this. Also, WExt
> > backward compatibility will be implemented as an interface between
> > userspace and cfg80211.
> > 
> > cfg80211 does, however, use some constants defined in nl80211 in order
> > to not define them twice (and the other way around isn't quite good
> > because they need to be visible in userspace and cfg80211 is not).
> > 
> > I'm still not sure if there should be an explicit 'device supports
> > configuration parameters x, y and z' or if userspace should just
> > grab the current configuration (which is supposed to be complete then)
> 
> I'm not sure what you mean here.  Do you really mean "grab the current
> _cmdlist_"?  Because I'm not sure how grabbing the current configuration
> (using GET_CONFIG) would necessarily return the right set of options for
> the device.  Also, what do you mean by "is supposed to be complete
> then"?
> 
> On large problem we had with WPA was that there was _no_ way to tell
> whether or not a driver supported it.  Trying a WPA-related ioctl() and
> hoping for the best is broken.  On the one hand, there were users

Just to clarify, there was no way to cleanly determine WPA support
before drivers started adding IW_ENC_CAPA_WPA to range->enc_capa.

> screaming that yes, Madwifi did in fact support WPA, but of course,
> there was no standard way of figuring that out and present it to the
> user in a sane manner.  We need to have an _explicit_ list of stuff that
> driver does and does not support so that intelligent decisions can be
> made before and/or without touching stuff that might turn the radio on
> or mess up an existing configuration set by somebody else.
> 
> > and see what's in it. Along the same lines, should unsupported
> > parameters result in the rejection, or should they be ignored?
> > (currently they are ignored)
> 
> Does "parameters" here mean CMD or ATTR?  In any case, there's a good
> case to be made for rejecting unsupported CMDs & ATTRs.  If the user,
> for example, wishes to restrict the roaming to a set of BSSIDs for
> security measures, for example (even if an insecure one), but the driver
> doesn't support that, should nl80211 just blindly pretend that it
> worked?  This might also get people to fix up their drivers and
> userspace programs too.
> 
> I do realize there's an API extensibility benefit to ignoring stuff you
> don't handle though (like 802.11 information element handling).  But if
> we're talking about an explicit request by a user for an option, if the
> driver doesn't support it, they should get an error.
> 
> > As mentioned to Larry, I'd like to integrate his great work on
> > regulation and use nl80211 as the userspace interface for it. I do
> > have a couple of questions wrt. that:
> > 
> >  * why should there be configuration per device? The user can only
> >    be operating in one country at a time... I think that information
> >    should just be available inside cfg80211 in a global structure
> >    for use by drivers whenever they need it (with some accessor
> >    methods to ensure locked access).
> > 
> >  * as far as I understood the communication is the kernel telling
> >    the daemon all the information it has (which may be none, the
> >    country from a broadcasting AP or more info from that) and the
> >    daemon then builds up a correct set of limitations and gives that
> >    to the kernel, without the daemon the kernel limits to some minimal
> >    set that is (likely) legal everywhere. Correct?
> > 
> >  * Should the userspace daemon be allowed to unilaterally update the
> >    regulatory information if it learns something new (via the user)?
> >    Or why not even just publish the regulatory information APs might
> >    broadcast in the scan results, and let the userspace daemon pick
> >    that apart? Then the kernel need not ask for anything at all...
> 
> That sounds like a good idea.  Putting 802.11d handling stuff into the
> kernel would essentially be duplicating the code and function of the
> userspace regulatory daemon, right?  That seems pointless.
> 
> >  * I seem to have read between the lines that the EEPROM data is
> >    pretty much useless. Is that generally true, or should the userspace
> >    daemon be told what it contains (somehow)?
> 
> Expose it, but don't use it blindly and certainly don't trust it.  Let
> the userspace daemon determine the policy as it sees fit from a variety
> of sources, _including_ EEPROM.
> 
> >  * Should the kernel perform some kind of validation on the regulatory
> >    data the daemon gives it as well?
> 
> "Trust, but verify." :)  At a minimum, do bounds-checking on the channel
> numbers and stuff that's standardized.  No channel 15 for us.  But the
> kernel probably shouldn't be including lookup tables for each region's
> channel mask, which again essentially duplicates the work done by the
> daemon.
> 
> Another questions; I didn't see anything for encryption and auth and
> stuff yet.  Are you just trying to get the basics down before going on
> to that stuff?  What do you still have on your ToDo list for nl80211
> before you'd consider "ready" to take over real configuration functions?
> 
> More comments below...  All in all looks nice and clean, for now :)
> 
> > Right now I'd think that it would make sense to just leave the whole
> > task to our userspace daemon, iow. nl80211 just provides a command
> > to update the kernel's knowledge about regulory and the daemon periodically
> > checks the scan results for country information, asks the user for
> > the country, or similar. If it's not running, the kernel simply starts
> > from a generic no-frills set.
> > 
> > --- wireless-dev.orig/net/Kconfig	2006-09-27 19:10:21.384088173 +0200
> > +++ wireless-dev/net/Kconfig	2006-09-27 19:14:44.214088173 +0200
> > @@ -250,6 +250,9 @@ source "net/ieee80211/Kconfig"
> >  config WIRELESS_EXT
> >  	bool
> >  
> > +config CFG80211
> > +	tristate
> > +
> >  endif   # if NET
> >  endmenu # Networking
> >  
> > --- wireless-dev.orig/net/Makefile	2006-09-27 19:10:21.414088173 +0200
> > +++ wireless-dev/net/Makefile	2006-09-27 19:14:44.214088173 +0200
> > @@ -44,6 +44,7 @@ obj-$(CONFIG_ECONET)		+= econet/
> >  obj-$(CONFIG_VLAN_8021Q)	+= 8021q/
> >  obj-$(CONFIG_IP_DCCP)		+= dccp/
> >  obj-$(CONFIG_IP_SCTP)		+= sctp/
> > +obj-$(CONFIG_CFG80211)		+= wireless/
> >  obj-$(CONFIG_D80211)		+= d80211/
> >  obj-$(CONFIG_IEEE80211)		+= ieee80211/
> >  obj-$(CONFIG_TIPC)		+= tipc/
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/net/wireless/Makefile	2006-09-27 19:14:44.214088173 +0200
> > @@ -0,0 +1,4 @@
> > +obj-$(CONFIG_CFG80211) += cfg80211.o
> > +
> > +cfg80211-objs := \
> > +	core.o nl80211.o
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/net/wireless/nl80211.c	2006-09-28 01:27:06.094150162 +0200
> > @@ -0,0 +1,1048 @@
> > +/*
> > + * This is the new netlink-based wireless configuration interface.
> > + *
> > + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
> > + */
> > +
> > +#include <linux/if.h>
> > +#include <linux/module.h>
> > +#include <linux/err.h>
> > +#include <net/genetlink.h>
> > +#include <net/cfg80211.h>
> > +#include <linux/mutex.h>
> > +#include <linux/list.h>
> > +#include <linux/if_ether.h>
> > +#include "core.h"
> > +#include "nl80211.h"
> > +
> > +/* the netlink family */
> > +static struct genl_family nl80211_fam = {
> > +	.id = GENL_ID_GENERATE,	/* don't bother with a hardcoded ID */
> > +	.name = "nl80211",	/* have users key off the name instead */
> > +	.hdrsize = 0,		/* no private header */
> > +	.version = 1,		/* no particular meaning now */
> > +	.maxattr = NL80211_ATTR_MAX,
> > +};
> > +
> > +/* internal helper: validate an information element attribute */
> > +static int check_information_element(struct nlattr *nla)
> > +{
> > +	int len = nla_len(nla);
> > +	u8 *data = nla_data(nla);
> > +	int elementlen;
> > +
> > +	while (len >= 2) {
> > +		/* 1 byte ID, 1 byte len, `len' bytes data */
> > +		elementlen = *(data+1) + 2;
> > +		data += elementlen;
> > +		len -= elementlen;
> > +	}
> > +	return len ? -EINVAL : 0;
> > +}
> > +
> > +/* internal helper: get drv and dev */
> > +static int get_drv_dev_by_info_ifindex(struct genl_info *info,
> > +				       struct cfg80211_registered_driver **drv,
> > +				       struct net_device **dev)
> > +{
> > +	int ifindex;
> > +
> > +	if (!info->attrs[NL80211_ATTR_IFINDEX])
> > +		return -EINVAL;
> > +
> > +	ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
> > +	*dev = dev_get_by_index(ifindex);
> > +	if (!dev)
> > +		return -ENODEV;
> > +
> > +	*drv = cfg80211_get_drv_from_ifindex(ifindex);
> > +	if (IS_ERR(*drv)) {
> > +		dev_put(*dev);
> > +		return PTR_ERR(*drv);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +/* policy for the attributes */
> > +static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
> > +	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_FLAGS] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_QUEUE] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_FRAME] = { .type = NLA_STRING,
> > +				 .len = NL80211_MAX_FRAME_LEN },
> > +	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
> > +	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_NETWORK_ID] = { .type = NLA_U16 },
> > +	[NL80211_ATTR_CHANNEL] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_RX_SENSITIVITY] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_BSSID] = { .len = ETH_ALEN },
> > +	[NL80211_ATTR_SSID] = { .type = NLA_NUL_STRING, .len = 32 },
> > +	[NL80211_ATTR_TRANSMIT_POWER] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_FRAG_THRESHOLD] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_INFORMATION_ELEMENT] = { .type = NLA_STRING,
> > +					       .len = NL80211_MAX_IE_LEN },
> > +	[NL80211_ATTR_ROAMING_CONTROL] = { .type = NLA_U32 },
> > +	[NL80211_ATTR_SCAN_TYPE] = { .type = NLA_U32 },
> > +};
> > +
> > +/* netlink command implementations */
> > +
> > +#define CHECK_CMD(ptr, cmd)				\
> > +	if (drv->ops->ptr)				\
> > +		NLA_PUT_FLAG(msg, NL80211_CMD_##cmd);
> > +
> > +static int nl80211_get_cmdlist(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +	int err;
> > +	struct nlattr *start;
> > +
> > +	drv = cfg80211_get_drv_from_info(info);
> > +	if (IS_ERR(drv))
> > +		return PTR_ERR(drv);
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_NEW_CMDLIST);
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, drv->wiphy);
> > +
> > +	start = nla_nest_start(msg, NL80211_ATTR_CMDS);
> > +	if (!start)
> > +		goto nla_put_failure;
> > +
> > +	/* unconditionally allow some common commands we handle centrally */
> > +	NLA_PUT_FLAG(msg, NL80211_CMD_GET_CMDLIST);
> > +	NLA_PUT_FLAG(msg, NL80211_CMD_GET_WIPHYS);
> > +	NLA_PUT_FLAG(msg, NL80211_CMD_GET_INTERFACES);
> > +
> > +	CHECK_CMD(list_interfaces, GET_INTERFACES);
> 
> Don't these two do exactly the same thing?  The first one adds
> GET_INTERFACES unconditionally, the next adds it (again!) if the
> interface supports it.  Either we add it unconditionally or we add it
> conditionally, but not both :)
> 
> > +	CHECK_CMD(inject_packet, INJECT);
> > +	CHECK_CMD(add_virtual_intf, ADD_VIRTUAL_INTERFACE);
> > +	CHECK_CMD(del_virtual_intf, DEL_VIRTUAL_INTERFACE);
> > +	CHECK_CMD(configure, CONFIGURE);
> > +	CHECK_CMD(get_config, GET_CONFIG);
> > +	CHECK_CMD(reassociate, REASSOCIATE);
> > +	CHECK_CMD(disassociate, DISASSOCIATE);
> > +	CHECK_CMD(deauth, DEAUTH);
> > +	CHECK_CMD(initiate_scan, INITIATE_SCAN);
> 
> I think we need a GET_SCAN here as well.  INITIATE_SCAN should
> definitely be CAP_NET_ADMIN-only or whatever, but GET_SCAN can be
> user-accessible.  Non-root stuff should still be able to get scan
> results even if they can't initiate one.
> 
> You also don't necessarily want to have to initiate a scan every time
> you want the results.  Drivers and/or d80211 should be caching the
> results anyway.  If d80211 is not, it should be.
> 
> > +	CHECK_CMD(set_roaming, SET_ROAMING_CONTROL);
> > +	CHECK_CMD(get_roaming, GET_ROAMING_CONTROL);
> > +	CHECK_CMD(set_fixed_bssid, SET_FIXED_BSSID);
> > +	CHECK_CMD(get_fixed_bssid, GET_FIXED_BSSID);
> > +	CHECK_CMD(get_association, GET_ASSOCIATION);
> > +	CHECK_CMD(get_auth_list, GET_AUTH_LIST);
> > +
> > +	nla_nest_end(msg, start);
> > +
> > +	genlmsg_end(msg, hdr);
> > +
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto put_drv;
> > +
> > + nla_put_failure:
> > + 	err = -ENOBUFS;
> > +	nlmsg_free(msg);
> > + put_drv:
> > +	cfg80211_put_drv(drv);
> > +	return err;
> > +}
> > +#undef CHECK_CMD
> > +
> > +static int nl80211_get_wiphys(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +	struct nlattr *start, *indexstart;
> > +	struct cfg80211_registered_driver *drv;
> > +	int idx = 1;
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_NEW_WIPHYS);
> > +	if (IS_ERR(hdr))
> > +		return PTR_ERR(hdr);
> > +
> > +	start = nla_nest_start(msg, NL80211_ATTR_WIPHY_LIST);
> > +	if (!start)
> > +		goto nla_outer_nest_failure;
> > +
> > +	mutex_lock(&cfg80211_drv_mutex);
> > +	list_for_each_entry(drv, &cfg80211_drv_list, list) {
> > +		indexstart = nla_nest_start(msg, idx++);
> > +		if (!indexstart)
> > +			goto nla_put_failure;
> > +		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, drv->wiphy);
> > +		nla_nest_end(msg, indexstart);
> > +	}
> > +	mutex_unlock(&cfg80211_drv_mutex);
> > +
> > +	nla_nest_end(msg, start);
> > +
> > +	genlmsg_end(msg, hdr);
> > +
> > +	return genlmsg_unicast(msg, info->snd_pid);
> > +
> > + nla_put_failure:
> > +	mutex_unlock(&cfg80211_drv_mutex);
> > + nla_outer_nest_failure:
> > +	nlmsg_free(msg);
> > +	return -ENOBUFS;
> > +}
> > +
> > +struct add_cb_data {
> > +	int idx;
> > +	struct sk_buff *skb;
> > +};
> > +
> > +static int addifidx(void *data, int ifidx)
> > +{
> > +	struct add_cb_data *cb = data;
> > +	struct net_device *dev = dev_get_by_index(ifidx);
> > +	int err = -ENOBUFS;
> > +	struct nlattr *start;
> > +
> > +	/* not that this can happen, since the caller
> > +	 * should hold the device open... */
> > +	if (!dev)
> > +		return -ENODEV;
> > +
> > +	start = nla_nest_start(cb->skb, cb->idx++);
> > +	if (!start)
> > +		goto nla_put_failure;
> > +
> > +	NLA_PUT_U32(cb->skb, NL80211_ATTR_IFINDEX, ifidx);
> > +	NLA_PUT_STRING(cb->skb, NL80211_ATTR_IFNAME, dev->name);
> > +
> > +	nla_nest_end(cb->skb, start);
> > +	err = 0;
> > +
> > + nla_put_failure:
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_get_intfs(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +	int err;
> > +	struct nlattr *start;
> > +	struct add_cb_data cb;
> > +
> > +	drv = cfg80211_get_drv_from_info(info);
> > +	if (IS_ERR(drv))
> > +		return PTR_ERR(drv);
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_NEW_INTERFACES);
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, drv->wiphy);
> > +
> > +	start = nla_nest_start(msg, NL80211_ATTR_INTERFACE_LIST);
> > +	if (!start) {
> > +		err = -ENOBUFS;
> > +		goto msg_free;
> > +	}
> > +
> > +	cb.skb = msg;
> > +	cb.idx = 1;
> > +	err = drv->ops->list_interfaces(drv->priv, &cb, addifidx);
> > +	if (err)
> > +		goto msg_free;
> > +
> > +	nla_nest_end(msg, start);
> > +
> > +	genlmsg_end(msg, hdr);
> > +
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto put_drv;
> > +
> > + nla_put_failure:
> > +	err = -ENOBUFS;
> > + msg_free:
> > +	nlmsg_free(msg);
> > + put_drv:
> > +	cfg80211_put_drv(drv);
> > +	return err;
> > +}
> > +
> > +static int nl80211_do_inject(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	u32 flags = 0;
> > +	int err, queue = -1;
> > +
> > +	if (!info->attrs[NL80211_ATTR_FRAME])
> > +		return -EINVAL;
> > +	if (info->attrs[NL80211_ATTR_FLAGS])
> > +		flags = nla_get_u32(info->attrs[NL80211_ATTR_FLAGS]);
> > +	if (info->attrs[NL80211_ATTR_QUEUE])
> > +		queue = (int) nla_get_u32(info->attrs[NL80211_ATTR_QUEUE]);
> > +
> > +	drv = cfg80211_get_drv_from_info(info);
> > +	if (IS_ERR(drv))
> > +		return PTR_ERR(drv);
> > +
> > +	if (!drv->ops->inject_packet) {
> > +		err = -ENOSYS;
> > +		goto unlock;
> > +	}
> > +
> > +	err = drv->ops->inject_packet(drv->priv,
> > +		nla_data(info->attrs[NL80211_ATTR_FRAME]),
> > +		nla_len(info->attrs[NL80211_ATTR_FRAME]),
> > +		flags,
> > +		queue);
> > + unlock:
> > +	cfg80211_put_drv(drv);
> > +	return err;
> > +}
> > +
> > +static int nl80211_add_virt_intf(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	unsigned int type = NL80211_IFTYPE_UNSPECIFIED;
> > +
> > +	if (!info->attrs[NL80211_ATTR_IFNAME])
> > +		return -EINVAL;
> > +
> > +	if (info->attrs[NL80211_ATTR_IFTYPE]) {
> > +		type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
> > +		if (type > NL80211_IFTYPE_MAX)
> > +			return -EINVAL;
> > +	}
> > +
> > +	drv = cfg80211_get_drv_from_info(info);
> > +	if (IS_ERR(drv))
> > +		return PTR_ERR(drv);
> > +
> > +	if (!drv->ops->add_virtual_intf) {
> > +		err = -ENOSYS;
> > +		goto unlock;
> > +	}
> > +
> > +	err = drv->ops->add_virtual_intf(drv->priv,
> > +		nla_data(info->attrs[NL80211_ATTR_IFNAME]), type);
> > +
> > + unlock:
> > +	cfg80211_put_drv(drv);
> > +	return err;
> > +}
> > +
> > +static int nl80211_del_virt_intf(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int ifindex, err;
> > +	struct net_device *dev;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +	ifindex = dev->ifindex;
> > +	dev_put(dev);
> > +
> > +	if (!drv->ops->del_virtual_intf) {
> > +		err = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> > +
> > +	err = drv->ops->del_virtual_intf(drv->priv, ifindex);
> > +
> > + out:
> > +	cfg80211_put_drv(drv);
> > +	return err;
> > +}
> > +
> > +static int nl80211_configure(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	struct cfg80211_config config;
> > +	struct nlattr *attr;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->configure) {
> > +		err = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> > +
> > +	memset(&config, 0, sizeof(config));
> > +
> > +	attr = info->attrs[NL80211_ATTR_SSID];
> > +	if (attr)
> > +		config.ssid = nla_data(attr);
> > +
> > +	attr = info->attrs[NL80211_ATTR_NETWORK_ID];
> > +	if (attr) {
> > +		config.valid |= CFG80211_CFG_VALID_NWID;
> > +		config.network_id = nla_get_u16(attr);
> > +	}
> > +
> > +	attr = info->attrs[NL80211_ATTR_RX_SENSITIVITY];
> > +	if (attr) {
> > +		config.valid |= CFG80211_CFG_VALID_RX_SENSITIVITY;
> > +		config.rx_sensitivity = (s32) nla_get_u32(attr);
> > +	}
> > +
> > +	attr = info->attrs[NL80211_ATTR_TRANSMIT_POWER];
> > +	if (attr) {
> > +		config.valid |= CFG80211_CFG_VALID_TRANSMIT_POWER;
> > +		config.transmit_power = nla_get_u32(attr);
> > +	}
> > +
> > +	attr = info->attrs[NL80211_ATTR_FRAG_THRESHOLD];
> > +	if (attr) {
> > +		config.valid |= CFG80211_CFG_VALID_FRAG_THRESHOLD;
> > +		config.fragmentation_threshold = nla_get_u32(attr);
> > +	}
> > +
> > +	attr = info->attrs[NL80211_ATTR_CHANNEL];
> > +	if (attr) {
> > +		config.valid |= CFG80211_CFG_VALID_CHANNEL;
> > +		config.channel = nla_get_u32(attr);
> > +	}
> > +
> 
> Back to the question about encryption settings here.  How complete
> nl80211/cfg80211 is right now, etc.
> 
> I'd also argue that one specific BSSID is part of an initial
> configuration.  We should support that in config command.  It's an
> implicit SET_FIXED_BSSID, yes.  But one of the major points of
> nl80211/cfg80211 was that you could bundle up a set of configuration
> settings into a single atomic "packet", which you couldn't do with WE.
> 
> So if a specific BSSID isn't sent in the initial config command, when do
> you set a specific BSSID?  Before?  After?  The behavior starts getting
> complicated, and we're back to a situation where every driver implements
> the semantics in a slightly different manner.
> 
> > +	err = drv->ops->configure(drv->priv, dev, &config);
> > + out:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_get_config(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	struct cfg80211_config config;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->get_config) {
> > +		err = -EOPNOTSUPP;
> > +		goto out_put_drv;
> > +	}
> > +
> > +	memset(&config, 0, sizeof(config));
> > +
> > +	drv->ops->get_config(drv->priv, dev, &config);
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_NEW_CONFIG);
> > +
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto out_put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
> > +
> > +	if (config.ssid)
> > +		NLA_PUT_STRING(msg, NL80211_ATTR_SSID, config.ssid);
> > +
> > +	if (config.valid & CFG80211_CFG_VALID_NWID)
> > +		NLA_PUT_U16(msg, NL80211_ATTR_NETWORK_ID, config.network_id);
> > +
> > +	if (config.valid & CFG80211_CFG_VALID_RX_SENSITIVITY)
> > +		NLA_PUT_U32(msg, NL80211_ATTR_RX_SENSITIVITY, (u32)config.rx_sensitivity);
> > +
> > +	if (config.valid & CFG80211_CFG_VALID_TRANSMIT_POWER)
> > +		NLA_PUT_U32(msg, NL80211_ATTR_TRANSMIT_POWER, config.transmit_power);
> > +
> > +	if (config.valid & CFG80211_CFG_VALID_FRAG_THRESHOLD)
> > +		NLA_PUT_U32(msg, NL80211_ATTR_FRAG_THRESHOLD, config.fragmentation_threshold);
> > +
> > +	if (config.valid & CFG80211_CFG_VALID_CHANNEL)
> > +		NLA_PUT_U32(msg, NL80211_ATTR_CHANNEL, config.channel);
> > +
> > +	genlmsg_end(msg, hdr);
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto out_put_drv;
> > +
> > + nla_put_failure:
> > +	err = -ENOBUFS;
> > +	nlmsg_free(msg);
> > + out_put_drv:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_set_roaming(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	int roaming_control;
> > +
> > +	if (!info->attrs[NL80211_ATTR_ROAMING_CONTROL])
> > +		return -EINVAL;
> > +	roaming_control = nla_get_u32(info->attrs[NL80211_ATTR_ROAMING_CONTROL]);
> > +
> > +	if (roaming_control > NL80211_ROAMING_CONTROL_MAX)
> > +		return -EINVAL;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->set_roaming) {
> > +		err = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> > +
> > +	err = drv->ops->set_roaming(drv->priv, dev, roaming_control);
> > + out:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_get_roaming(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->get_roaming) {
> > +		err = -EOPNOTSUPP;
> > +		goto out_put_drv;
> > +	}
> > +
> > +	err = drv->ops->get_roaming(drv->priv, dev);
> > +	if (err < 0)
> > +		goto out_put_drv;
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_ROAMING_CONTROL);
> > +
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto out_put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
> > +	NLA_PUT_U32(msg, NL80211_ATTR_ROAMING_CONTROL, err);
> > +
> > +	genlmsg_end(msg, hdr);
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto out_put_drv;
> > +
> > + nla_put_failure:
> > +	err = -ENOBUFS;
> > +	nlmsg_free(msg);
> > + out_put_drv:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_set_fixed_bssid(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	u8 *bssid;
> > +
> > +	if (!info->attrs[NL80211_ATTR_BSSID])
> > +		return -EINVAL;
> > +	bssid = nla_data(info->attrs[NL80211_ATTR_BSSID]);
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->set_fixed_bssid) {
> > +		err = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> > +
> > +	err = drv->ops->set_fixed_bssid(drv->priv, dev, bssid);
> > + out:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_get_fixed_bssid(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +	u8 bssid[ETH_ALEN];
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->get_fixed_bssid) {
> > +		err = -EOPNOTSUPP;
> > +		goto out_put_drv;
> > +	}
> > +
> > +	err = drv->ops->get_fixed_bssid(drv->priv, dev, bssid);
> > +	if (err < 0)
> > +		goto out_put_drv;
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_FIXED_BSSID);
> > +
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto out_put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
> > +	NLA_PUT(msg, NL80211_ATTR_BSSID, ETH_ALEN, bssid);
> > +
> > +	genlmsg_end(msg, hdr);
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto out_put_drv;
> > +
> > + nla_put_failure:
> > +	err = -ENOBUFS;
> > +	nlmsg_free(msg);
> > + out_put_drv:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_get_association(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +	u8 bssid[ETH_ALEN];
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->get_association) {
> > +		err = -EOPNOTSUPP;
> > +		goto out_put_drv;
> > +	}
> > +
> > +	err = drv->ops->get_association(drv->priv, dev, bssid);
> > +	if (err < 0)
> > +		goto out_put_drv;
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_ASSOCIATION_CHANGED);
> > +
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto out_put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
> > +	if (err == 1)
> > +		NLA_PUT(msg, NL80211_ATTR_BSSID, ETH_ALEN, bssid);
> > +
> > +	genlmsg_end(msg, hdr);
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto out_put_drv;
> > +
> > + nla_put_failure:
> > +	err = -ENOBUFS;
> > +	nlmsg_free(msg);
> > + out_put_drv:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_assoc_deauth(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	int (*act)(void *priv, struct net_device *dev);
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	switch (info->genlhdr->cmd) {
> > +	case NL80211_CMD_DISASSOCIATE:
> > +		act = drv->ops->disassociate;
> > +		break;
> > +	case NL80211_CMD_REASSOCIATE:
> > +		act = drv->ops->reassociate;
> > +		break;
> > +	case NL80211_CMD_DEAUTH:
> > +		act = drv->ops->deauth;
> > +		break;
> > +	default:
> > +		act = NULL;
> > +	}
> > +
> > +	if (!act) {
> > +		err = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> > +
> > +	err = act(drv->priv, dev);
> > + out:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int add_bssid(void *data, u8 *bssid)
> > +{
> > +	struct add_cb_data *cb = data;
> > +	int err = -ENOBUFS;
> > +	struct nlattr *start;
> > +
> > +	start = nla_nest_start(cb->skb, cb->idx++);
> > +	if (!start)
> > +		goto nla_put_failure;
> > +
> > +	NLA_PUT(cb->skb, NL80211_ATTR_BSSID, ETH_ALEN, bssid);
> > +
> > +	nla_nest_end(cb->skb, start);
> > +	err = 0;
> > +
> > + nla_put_failure:
> > +	return err;
> > +}
> > +
> > +static int nl80211_get_auth_list(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	struct net_device *dev;
> > +	struct sk_buff *msg;
> > +	void *hdr;
> > +	int err;
> > +	struct nlattr *start;
> > +	struct add_cb_data cb;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->get_auth_list) {
> > +		err = -EOPNOTSUPP;
> > +		goto put_drv;
> > +	}
> > +
> > +	hdr = nl80211msg_new(&msg, info->snd_pid, info->snd_seq, 0,
> > +			     NL80211_CMD_AUTH_LIST);
> > +	if (IS_ERR(hdr)) {
> > +		err = PTR_ERR(hdr);
> > +		goto put_drv;
> > +	}
> > +
> > +	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
> > +
> > +	start = nla_nest_start(msg, NL80211_ATTR_BSSID_LIST);
> > +	if (!start) {
> > +		err = -ENOBUFS;
> > +		goto msg_free;
> > +	}
> > +
> > +	cb.skb = msg;
> > +	cb.idx = 1;
> > +	err = drv->ops->get_auth_list(drv->priv, dev, &cb, add_bssid);
> > +	if (err)
> > +		goto msg_free;
> > +
> > +	nla_nest_end(msg, start);
> > +
> > +	genlmsg_end(msg, hdr);
> > +
> > +	err = genlmsg_unicast(msg, info->snd_pid);
> > +	goto put_drv;
> > +
> > + nla_put_failure:
> > +	err = -ENOBUFS;
> > + msg_free:
> > +	nlmsg_free(msg);
> > + put_drv:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static int nl80211_initiate_scan(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int err;
> > +	struct net_device *dev;
> > +	struct scan_params params;
> > +	struct scan_channel *channels = NULL;
> > +	int count = -1;
> > +
> > +	err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
> > +	if (err)
> > +		return err;
> > +
> > +	if (!drv->ops->initiate_scan) {
> > +		err = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> > +
> > +	params.active = 0;
> > +
> > +	if (info->attrs[NL80211_ATTR_FLAGS])
> > +		params.active = !!(nla_get_u32(info->attrs[NL80211_ATTR_FLAGS])
> > +					& NL80211_FLAG_SCAN_ACTIVELY);
> 
> ^^^^ see note below about naming of NL80211_FLAG_SCAN_*
> 
> > +
> > +	if (info->attrs[NL80211_ATTR_CHANNEL_LIST]) {
> > +		struct nlattr *attr = info->attrs[NL80211_ATTR_CHANNEL_LIST];
> > +		struct nlattr *nla;
> > +		int rem;
> > +		struct nlattr **tb;
> > +
> > +		/* let's count first */
> > +		count = 0;
> > +		nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem)
> > +			count++;
> > +
> > +		if (count == 0) {
> > +			/* assume we should actually scan all channels,
> > +			 * scanning no channels make no sense */
> > +			count = -1;
> > +			goto done_channels;
> > +		}
> > +
> > +		channels = kmalloc(count * sizeof(struct scan_channel),
> > +				   GFP_KERNEL);
> > +		tb = kmalloc((NL80211_ATTR_MAX+1) * sizeof(struct nlattr),
> > +			     GFP_KERNEL);
> > +
> > +		count = 0;
> > +		nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
> > +			err = nla_parse(tb, NL80211_ATTR_MAX, nla_data(nla),
> > +					nla_len(nla), nl80211_policy);
> > +			if (err || !tb[NL80211_ATTR_CHANNEL]) {
> > +				err = -EINVAL;
> > +				kfree(tb);
> > +				kfree(channels);
> > +				goto out;
> > +			}
> > +			channels[count].channel =
> > +				nla_get_u32(tb[NL80211_ATTR_CHANNEL]);
> > +
> > +			channels[count].active = params.active;
> > +
> > +			if (tb[NL80211_ATTR_FLAGS])
> > +				channels[count].active =
> > +					!!(nla_get_u32(tb[NL80211_ATTR_FLAGS])
> > +						& NL80211_FLAG_SCAN_ACTIVELY);
> > +			count++;
> > +		}
> > +		kfree(tb);
> > +	}
> > +
> > + done_channels:
> > +	params.channels = channels;
> > +	params.n_channels = count;
> > +
> > +	err = drv->ops->initiate_scan(drv->priv, dev, &params);
> > +
> > +	kfree(channels);
> > + out:
> > +	cfg80211_put_drv(drv);
> > +	dev_put(dev);
> > +	return err;
> > +}
> > +
> > +static struct genl_ops nl80211_ops[] = {
> > +	{
> > +		.cmd = NL80211_CMD_GET_CMDLIST,
> > +		.doit = nl80211_get_cmdlist,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_WIPHYS,
> > +		.doit = nl80211_get_wiphys,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_INTERFACES,
> > +		.doit = nl80211_get_intfs,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_INJECT,
> > +		.doit = nl80211_do_inject,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_ADD_VIRTUAL_INTERFACE,
> > +		.doit = nl80211_add_virt_intf,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_DEL_VIRTUAL_INTERFACE,
> > +		.doit = nl80211_del_virt_intf,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_CONFIGURE,
> > +		.doit = nl80211_configure,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_CONFIG,
> > +		.doit = nl80211_get_config,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_SET_ROAMING_CONTROL,
> > +		.doit = nl80211_set_roaming,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_ROAMING_CONTROL,
> > +		.doit = nl80211_get_roaming,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_SET_FIXED_BSSID,
> > +		.doit = nl80211_set_fixed_bssid,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_FIXED_BSSID,
> > +		.doit = nl80211_get_fixed_bssid,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_ASSOCIATION,
> > +		.doit = nl80211_get_association,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_DISASSOCIATE,
> > +		.doit = nl80211_assoc_deauth,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_DEAUTH,
> > +		.doit = nl80211_assoc_deauth,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_REASSOCIATE,
> > +		.doit = nl80211_assoc_deauth,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_GET_AUTH_LIST,
> > +		.doit = nl80211_get_auth_list,
> > +		.policy = nl80211_policy,
> > +		/* can be retrieved by unprivileged users */
> > +	},
> > +	{
> > +		.cmd = NL80211_CMD_INITIATE_SCAN,
> > +		.doit = nl80211_initiate_scan,
> > +		.policy = nl80211_policy,
> > +		.flags = GENL_ADMIN_PERM,
> > +	},
> > +};
> > +
> > +
> > +/* exported functions */
> > +
> > +void *nl80211hdr_put(struct sk_buff *skb, u32 pid, u32 seq, int flags, u8 cmd)
> > +{
> > +	/* since there is no private header just add the generic one */
> > +	return genlmsg_put(skb, pid, seq, nl80211_fam.id, 0,
> > +			   flags, cmd, nl80211_fam.version);
> > +}
> > +EXPORT_SYMBOL_GPL(nl80211hdr_put);
> > +
> > +void *nl80211msg_new(struct sk_buff **skb, u32 pid, u32 seq, int flags, u8 cmd)
> > +{
> > +	void *hdr;
> > +
> > +	*skb = nlmsg_new(NLMSG_GOODSIZE);
> > +	if (!*skb)
> > +		return ERR_PTR(-ENOBUFS);
> > +
> > +	hdr = nl80211hdr_put(*skb, pid, seq, flags, cmd);
> > +	if (!hdr) {
> > +		nlmsg_free(*skb);
> > +		return ERR_PTR(-ENOBUFS);
> > +	}
> > +
> > +	return hdr;
> > +}
> > +EXPORT_SYMBOL_GPL(nl80211msg_new);
> > +
> > +/* initialisation/exit functions */
> > +
> > +int nl80211_init(void)
> > +{
> > +	int err, i;
> > +
> > +	err = genl_register_family(&nl80211_fam);
> > +	if (err)
> > +		return err;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(nl80211_ops); i++) {
> > +		err = genl_register_ops(&nl80211_fam, &nl80211_ops[i]);
> > +		if (err)
> > +			goto err_out;
> > +	}
> > +	return 0;
> > + err_out:
> > + 	genl_unregister_family(&nl80211_fam);
> > +	return err;
> > +}
> > +
> > +void nl80211_exit(void)
> > +{
> > +	genl_unregister_family(&nl80211_fam);
> > +}
> > --- wireless-dev.orig/include/linux/Kbuild	2006-09-27 19:10:21.564088173 +0200
> > +++ wireless-dev/include/linux/Kbuild	2006-09-27 19:14:44.224088173 +0200
> > @@ -28,7 +28,7 @@ header-y += affs_fs.h affs_hardblocks.h 
> >  	sound.h stddef.h synclink.h telephony.h termios.h ticable.h	\
> >  	times.h tiocl.h tipc.h toshiba.h ultrasound.h un.h utime.h	\
> >  	utsname.h video_decoder.h video_encoder.h videotext.h vt.h	\
> > -	wavefront.h wireless.h xattr.h x25.h zorro_ids.h
> > +	wavefront.h wireless.h xattr.h x25.h zorro_ids.h nl80211.h
> >  
> >  unifdef-y += acct.h adb.h adfs_fs.h agpgart.h apm_bios.h atalk.h	\
> >  	atmarp.h atmdev.h atm.h atm_tcp.h audit.h auto_fs.h binfmts.h	\
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/include/linux/nl80211.h	2006-09-28 00:38:55.264150162 +0200
> > @@ -0,0 +1,276 @@
> > +#ifndef __LINUX_NL80211_H
> > +#define __LINUX_NL80211_H
> > +/*
> > + * 802.11 netlink interface public header
> > + *
> > + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
> > + */
> > +
> > +/* currently supported commands
> > + * don't change the order or add anything inbetween, this is ABI! */
> > +enum {
> > +	/* There's no technical reason to not use command 0 but malformed
> > +	 * zeroed messages may have it and this catches that */
> > +	NL80211_CMD_UNSPEC,
> > +
> > +	/* Get supported commands by ifindex,
> > +	 * uses NL80211_ATTR_CMDS (output) and NL80211_ATTR_IFINDEX (input) */
> > +	NL80211_CMD_GET_CMDLIST,
> > +
> > +	/* Supported commands returned */
> > +	NL80211_CMD_NEW_CMDLIST,
> > +
> > +	/* Inject a frame using NL80211_ATTR_FLAGS and NL80211_ATTR_FRAME.
> > +	 * If kernel sends this, it's a status notification for the injected
> > +	 * frame. */
> > +	NL80211_CMD_INJECT,
> > +
> > +	/* add a virtual interface to a group that is identified by any
> > +	 * other ifindex in the group of a wiphy index, needs the
> > +	 * NL80211_IF_NAME attribute */
> > +	NL80211_CMD_ADD_VIRTUAL_INTERFACE,
> > +
> > +	/* remove a given (with NL80211_ATTR_IFINDEX) virtual device */
> > +	NL80211_CMD_DEL_VIRTUAL_INTERFACE,
> > +
> > +	/* get list of all wiphys */
> > +	NL80211_CMD_GET_WIPHYS,
> > +
> > +	/* get list of all wiphys */
> > +	NL80211_CMD_NEW_WIPHYS,
> > +
> > +	/* get list of all interfaces belonging to a wiphy */
> > +	NL80211_CMD_GET_INTERFACES,
> > +
> > +	/* get list of all interfaces belonging to a wiphy */
> > +	NL80211_CMD_NEW_INTERFACES,
> > +
> > +	/* configure device */
> > +	NL80211_CMD_CONFIGURE,
> > +
> > +	/* request configuration */
> > +	NL80211_CMD_GET_CONFIG,
> > +
> > +	/* configuration sent from kernel */
> > +	NL80211_CMD_NEW_CONFIG,
> > +
> > +	/* initiate scan.
> > +	 * Takes a CHANNEL_LIST attribute containing nested
> > +	 * attributes which in turn contain CHANNEL and FLAGS
> > +	 * attributes.
> > +	 * The top level can also contain a FLAGS attribute
> > +	 * which is then the default for each channel.
> > +	 * If no channel list is given (or it is empty)
> > +	 * all channels shall be scanned. */
> > +	NL80211_CMD_INITIATE_SCAN,
> > +
> > +	/* scan result (kernel -> userspace) */
> > +	NL80211_CMD_SCAN_RESULT,
> > +
> > +	/* change roaming control */
> > +	NL80211_CMD_SET_ROAMING_CONTROL,
> > +
> > +	/* get roaming control setting */
> > +	NL80211_CMD_GET_ROAMING_CONTROL,
> > +
> > +	/* answer to that */
> > +	NL80211_CMD_ROAMING_CONTROL,
> > +
> > +	/* set access point BSSID for userspace roaming */
> > +	NL80211_CMD_SET_FIXED_BSSID,
> > +
> > +	/* get currently set userspace roaming BSSID */
> > +	NL80211_CMD_GET_FIXED_BSSID,
> > +
> > +	/* currently set roaming BSSID */
> > +	NL80211_CMD_FIXED_BSSID,
> > +
> > +	/* get current association information, if not associated then
> > +	 * the BSSID attribute is not present in response */
> > +	NL80211_CMD_GET_ASSOCIATION,
> > +
> > +	/* association notification and response to GET_BSSID */
> > +	NL80211_CMD_ASSOCIATION_CHANGED,
> > +
> > +	/* disassociate from current AP */
> > +	NL80211_CMD_DISASSOCIATE,
> > +
> > +	/* deauth from current AP */
> > +	NL80211_CMD_DEAUTH,
> > +
> > +	/* re-associate with current settings
> > +	 * (SSID and BSSID if roaming control in userspace) */
> > +	NL80211_CMD_REASSOCIATE,
> > +
> > +	/* request the full list of BSSs the device is
> > +	 * authenticated with */
> > +	NL80211_CMD_GET_AUTH_LIST,
> > +
> > +	/* sent as a response to GET_AUTH_LIST containing
> > +	 * an ATTR_BSSID_LIST */
> > +	NL80211_CMD_AUTH_LIST,
> > +
> > +	/* sent when authenticating/deauthenticating.
> > +	 * contains an ATTR_BSSID and possibly an
> > +	 * ATTR_DEAUTHENTICATED */
> > +	NL80211_CMD_AUTHENTICATION_CHANGED,
> > +
> > +	/* add commands here */
> > +
> > +	/* used to define NL80211_CMD_MAX below */
> > +	__NL80211_CMD_AFTER_LAST,
> > +};
> > +#define NL80211_CMD_MAX (__NL80211_CMD_AFTER_LAST - 1)
> > +
> > +
> > +/* currently supported attributes.
> > + * don't change the order or add anything inbetween, this is ABI! */
> > +enum {
> > +	NL80211_ATTR_UNSPEC,
> > +
> > +	/* network device (ifindex) to operate on */
> > +	NL80211_ATTR_IFINDEX,
> > +
> > +	/* wiphy index to operate on */
> > +	NL80211_ATTR_WIPHY,
> > +
> > +	/* list of u8 cmds that a given device implements */
> > +	NL80211_ATTR_CMDS,
> > +
> > +	/* flags for injection and other commands, see below */
> > +	NL80211_ATTR_FLAGS,
> > +
> > +	/* which hardware queue to use */
> > +	NL80211_ATTR_QUEUE,
> > +
> > +	/* frame to inject or received frame for mgmt frame subscribers */
> > +	NL80211_ATTR_FRAME,
> > +
> > +	/* interface name */
> > +	NL80211_ATTR_IFNAME,
> > +
> > +	/* type of (virtual) interface */
> > +	NL80211_ATTR_IFTYPE,
> > +
> > +	/* interface list */
> > +	NL80211_ATTR_INTERFACE_LIST,
> > +
> > +	/* wiphy list */
> > +	NL80211_ATTR_WIPHY_LIST,
> > +
> > +	/* attributes used for configuration */
> > +	/* network ID (pre 802.11 HW) */
> > +	NL80211_ATTR_NETWORK_ID,
> > +
> > +	/* channel, 1-14 are B/G */
> > +	NL80211_ATTR_CHANNEL,
> > +
> > +	/* channel list for scan determination */
> > +	NL80211_ATTR_CHANNEL_LIST,
> > +
> > +	/* receiver sensitivity in dBm */
> > +	NL80211_ATTR_RX_SENSITIVITY,
> > +
> > +	/* BSSID to associate to, only used when roaming control
> > +	 * is in userspace */
> > +	NL80211_ATTR_BSSID,
> > +
> > +	/* list of multiple BSSIDs, this is a nested attribute
> > +	 * containing an index->(attrs) mapping */
> > +	NL80211_ATTR_BSSID_LIST,
> > +
> > +	/* this is a flag for when an authentication is lost */
> > +	NL80211_ATTR_DEAUTHENTICATED,
> > +
> > +	/* SSID of ESS to associate to */
> > +	NL80211_ATTR_SSID,
> > +
> > +	/* transmit power in mW */
> > +	NL80211_ATTR_TRANSMIT_POWER,
> > +
> > +	/* fragmentation threshold in bytes */
> > +	NL80211_ATTR_FRAG_THRESHOLD,
> > +
> > +	/* one or more information elements */
> > +	NL80211_ATTR_INFORMATION_ELEMENT,
> > +
> > +	NL80211_ATTR_ROAMING_CONTROL,
> > +
> > +	NL80211_ATTR_SCAN_TYPE,
> > +
> > +	/* add attributes here */
> > +
> > +	/* used to define NL80211_ATTR_MAX below */
> > +	__NL80211_ATTR_AFTER_LAST,
> > +};
> > +#define NL80211_ATTR_MAX (__NL80211_ATTR_AFTER_LAST - 1)
> > +
> > +/**
> > + * NL80211_FLAG_TXSTATUS - send transmit status indication
> > + */
> > +#define NL80211_FLAG_TXSTATUS		(1<<0)
> > +/**
> > + * NL80211_FLAG_ENCRYPT - encrypt this packet
> > + * Warning: This looks inside the packet header!
> > + */
> > +#define NL80211_FLAG_ENCRYPT		(1<<1)
> > +
> > +/**
> > + * NL80211_FLAG_SCAN_ACTIVELY - set this with a scan
> > + * request to have it scan actively, can also be used
> > + * within the nested CHANNEL_LIST...
> > + */
> > +#define NL80211_FLAG_SCAN_ACTIVELY	(1<<2)
> 
> ACTIVELY is an adverb, and that doesn't parse very well in this context.
> It also just sounds weird here.  Better options:
> 
> FLAG_SCAN_ACTIVE
> FLAG_SCAN_TYPE_ACTIVE (<-- my favorite)
> FLAG_ACTIVE_SCAN
> 
> Looks great,
> 
> Dan
> 
> > +/**
> > + * maximum length of a frame that can be injected
> > + */
> > +#define NL80211_MAX_FRAME_LEN 2500
> > +
> > +/* this is an arbitrary limit, 516 means two full-length
> > + * IEs would fit... */
> > +/**
> > + * maximum length of IE(s) passed in an NL80211_ATTR_INFORMATION_ELEMENT.
> > + */
> > +#define NL80211_MAX_IE_LEN 516
> > +
> > +/* may need to be bumped? */
> > +/**
> > + * maximum number of items in an ATTR_CHANNEL_LIST
> > + */
> > +#define NL80211_MAX_CHANNEL_LIST_ITEM 20
> > +
> > +/**
> > + * &enum nl80211_iftype - (virtual) interface types
> > + *
> > + * This structure is used with the NL80211_ATTR_IFTYPE
> > + * to set the type of an interface.
> > + * Note that these are intentionally compatible with
> > + * the IW_MODE_* constants except for the removal of
> > + * IW_MODE_AUTO.
> > + *
> > + */
> > +enum {
> > +	NL80211_IFTYPE_UNSPECIFIED,
> > +	NL80211_IFTYPE_ADHOC,
> > +	NL80211_IFTYPE_STATION,
> > +	NL80211_IFTYPE_AP,
> > +	NL80211_IFTYPE_WDS,
> > +	NL80211_IFTYPE_SECONDARY,
> > +	NL80211_IFTYPE_MONITOR,
> > +
> > +	/* keep last */
> > +	__NL80211_IFTYPE_AFTER_LAST
> > +};
> > +#define NL80211_IFTYPE_MAX (__NL80211_IFTYPE_AFTER_LAST - 1)
> > +
> > +enum {
> > +	NL80211_ROAMING_CONTROL_KERNEL,
> > +	NL80211_ROAMING_CONTROL_USERSPACE,
> > +
> > +	/* keep last */
> > +	__NL80211_ROAMING_CONTROL_AFTER_LAST
> > +};
> > +#define NL80211_ROAMING_CONTROL_MAX (__NL80211_ROAMING_CONTROL_AFTER_LAST-1)
> > +
> > +#endif /* __LINUX_NL80211_H */
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/include/net/cfg80211.h	2006-09-28 00:38:55.274150162 +0200
> > @@ -0,0 +1,191 @@
> > +#ifndef __NET_CFG80211_H
> > +#define __NET_CFG80211_H
> > +
> > +#include <linux/netlink.h>
> > +#include <linux/nl80211.h>
> > +#include <linux/skbuff.h>
> > +#include <linux/netdevice.h>
> > +#include <net/genetlink.h>
> > +
> > +/*
> > + * 802.11 configuration in-kernel interface
> > + *
> > + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
> > + */
> > +
> > +/**
> > + * struct cfg80211_config - description of a configuration (request)
> > + */
> > +struct cfg80211_config {
> > +	/* first fields with 'internal' validity */
> > +
> > +	/* SSID to use, valid if not NULL. change forces reassociation */
> > +	u8 *ssid;
> > +
> > +	/* now fields with explicit validity */
> > +#define CFG80211_CFG_VALID_NWID			(1<<0)
> > +#define CFG80211_CFG_VALID_RX_SENSITIVITY	(1<<1)
> > +#define CFG80211_CFG_VALID_TRANSMIT_POWER	(1<<2)
> > +#define CFG80211_CFG_VALID_FRAG_THRESHOLD	(1<<3)
> > +#define CFG80211_CFG_VALID_CHANNEL		(1<<4)
> > +	unsigned int valid;
> > +
> > +	u16 network_id;
> > +	s32 rx_sensitivity;
> > +	u32 transmit_power;
> > +	u32 fragmentation_threshold;
> > +	u32 channel;
> > +};
> > +
> > +struct scan_channel {
> > +	u32 channel;
> > +	int active;
> > +};
> > +
> > +struct scan_params {
> > +	/* number of items in 'channels' array
> > +	 * or -1 to indicate scanning all channels
> > +	 * (in that case 'channels' is NULL) */
> > +	int n_channels;
> > +
> > +	/* use only when n_channels is -1 to determine
> > +	 * whether scanning should be active or not */
> > +	int active;
> > +
> > +	/* the channel list if any */
> > +	struct scan_channel *channels;
> > +};
> > +
> > +/**
> > + * struct cfg80211_ops - backend description for wireless configuration
> > + *
> > + * This struct is registered by fullmac card drivers and/or wireless stacks
> > + * in order to handle configuration requests on their interfaces.
> > + *
> > + * The priv pointer passed to each call is the pointer that was
> > + * registered in cfg80211_register_driver().
> > + *
> > + * All callbacks except where otherwise noted should return 0
> > + * on success or a negative error code.
> > + *
> > + * @list_interfaces: for each interfaces belonging to the wiphy identified
> > + *		     by the priv pointer, call the one() function with the
> > + *		     given data and the ifindex. This callback is required.
> > + *
> > + * @inject_packet: inject the given frame with the NL80211_FLAG_*
> > + *		   flags onto the given queue.
> > + *
> > + * @add_virtual_intf: create a new virtual interface with the given name
> > + *
> > + * @del_virtual_intf: remove the virtual interface determined by ifindex.
> > + *
> > + * @configure: configure the given interface as requested in the config struct.
> > + *	       must not ignore any configuration item, if something is
> > + *	       is requested that cannot be fulfilled return an error
> > + *
> > + * @get_config: fill the given config structure with the current configuration
> > + *
> > + * @reassociate: reassociate with current settings (SSID, BSSID if
> > + *		 userspace roaming is enabled)
> > + *
> > + * @disassociate: disassociate from current AP
> > + *
> > + * @deauth: deauth from current AP
> > + *
> > + * @initiate_scan: ...
> > + *
> > + * @set_roaming: set who gets to control roaming, the roaming_control
> > + *		 parameter is passed NL80211_ROAMING_CONTROL_* values.
> > + *
> > + * @get_roaming: return where roaming control currently is done or
> > + *		 a negative error.
> > + *
> > + * @set_fixed_bssid: set BSSID to use with userspace roaming, forces
> > + *		     reassociation if changing.
> > + * @get_fixed_bssid: get BSSID that is used with userspace roaming,
> > + *		     the bssid parameter has space for 6 bytes
> > + *
> > + * @get_association: get BSSID of the BSS that the device is currently
> > + *		     associated to and return 1, or return 0 if not
> > + *		     associated (or a negative error code)
> > + * @get_auth_list: get list of BSSIDs of all BSSs the device has
> > + *		   authenticated with, must call next_bssid for each,
> > + *		   next_bssid returns non-zero on error, the given data
> > + *		   is to be passed to that callback
> > + */
> > +struct cfg80211_ops {
> > +	int	(*list_interfaces)(void *priv, void *data,
> > +				   int (*one)(void *data, int ifindex));
> > +
> > +
> > +	int	(*inject_packet)(void *priv, void *frame, int framelen,
> > +				 u32 flags, int queue);
> > +
> > +
> > +	int	(*add_virtual_intf)(void *priv, char *name,
> > +				    unsigned int type);
> > +	int	(*del_virtual_intf)(void *priv, int ifindex);
> > +
> > +
> > +	int	(*configure)(void *priv, struct net_device *dev,
> > +			     struct cfg80211_config *cfg);
> > +	void	(*get_config)(void *priv, struct net_device *dev,
> > +			      struct cfg80211_config *cfg);
> > +
> > +
> > +	int	(*reassociate)(void *priv, struct net_device *dev);
> > +	int	(*disassociate)(void *priv, struct net_device *dev);
> > +	int	(*deauth)(void *priv, struct net_device *dev);
> > +
> > +
> > +	int	(*initiate_scan)(void *priv, struct net_device *dev,
> > +				 struct scan_params *params);
> > +
> > +
> > +	int	(*set_roaming)(void *priv, struct net_device *dev,
> > +			       int roaming_control);
> > +	int	(*get_roaming)(void *priv, struct net_device *dev);
> > +	int	(*set_fixed_bssid)(void *priv, struct net_device *dev,
> > +				   u8 *bssid);
> > +	int	(*get_fixed_bssid)(void *priv, struct net_device *dev,
> > +				   u8 *bssid);
> > +
> > +
> > +	int	(*get_association)(void *priv, struct net_device *dev,
> > +				   u8 *bssid);
> > +
> > +	int	(*get_auth_list)(void *priv, struct net_device *dev,
> > +				 void *data,
> > +				 int (*next_bssid)(void *data, u8 *bssid));
> > +};
> > +
> > +/**
> > + * cfg80211_register - register a wiphy with cfg80211
> > + *
> > + * register a given method structure with the cfg80211 system
> > + * and associate the 'priv' pointer with it.
> > + *
> > + * Returns a non-negative wiphy index or a negative error code.
> > + *
> > + * NOTE: for proper operation, this priv pointer MUST also be
> > + * assigned to each &struct net_device's @ieee80211_ptr member!
> > + */
> > +extern int cfg80211_register(struct cfg80211_ops *ops, void *priv);
> > +
> > +/**
> > + * cfg80211_unregister - deregister a wiphy from cfg80211
> > + *
> > + * unregister a device with the given priv pointer.
> > + * After this call, no more requests can be made with this priv
> > + * pointer, but the call may sleep to wait for an outstanding
> > + * request that is being handled.
> > + */
> > +extern void cfg80211_unregister(void *priv);
> > +
> > +/* helper functions specific to nl80211 */
> > +extern void *nl80211hdr_put(struct sk_buff *skb, u32 pid,
> > +			    u32 seq, int flags, u8 cmd);
> > +extern void *nl80211msg_new(struct sk_buff **skb, u32 pid,
> > +			    u32 seq, int flags, u8 cmd);
> > +
> > +#endif /* __NET_CFG80211_H */
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/net/wireless/core.c	2006-09-28 00:38:22.664150162 +0200
> > @@ -0,0 +1,233 @@
> > +/*
> > + * This is the new wireless configuration interface.
> > + *
> > + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
> > + */
> > +
> > +#include "core.h"
> > +#include "nl80211.h"
> > +#include <linux/if.h>
> > +#include <linux/module.h>
> > +#include <linux/err.h>
> > +#include <net/genetlink.h>
> > +#include <net/cfg80211.h>
> > +#include <linux/mutex.h>
> > +#include <linux/list.h>
> > +
> > +MODULE_AUTHOR("Johannes Berg");
> > +MODULE_LICENSE("GPL");
> > +
> > +/* RCU might be appropriate here since we usually
> > + * only read the list, and that can happen quite
> > + * often because we need to do it for each command */
> > +LIST_HEAD(cfg80211_drv_list);
> > +DEFINE_MUTEX(cfg80211_drv_mutex);
> > +static int wiphy_counter;
> > +
> > +/* requires nl80211_drv_mutex to be held! */
> > +static struct cfg80211_registered_driver *cfg80211_drv_by_priv(void *priv)
> > +{
> > +	struct cfg80211_registered_driver *result = NULL, *drv;
> > +
> > +	if (!priv)
> > +		return NULL;
> > +
> > +	list_for_each_entry(drv, &cfg80211_drv_list, list) {
> > +		if (drv->priv == priv) {
> > +			result = drv;
> > +			break;
> > +		}
> > +	}
> > +
> > +	return result;
> > +}
> > +
> > +/* requires cfg80211_drv_mutex to be held! */
> > +static struct cfg80211_registered_driver *cfg80211_drv_by_wiphy(int wiphy)
> > +{
> > +	struct cfg80211_registered_driver *result = NULL, *drv;
> > +
> > +	list_for_each_entry(drv, &cfg80211_drv_list, list) {
> > +		if (drv->wiphy == wiphy) {
> > +			result = drv;
> > +			break;
> > +		}
> > +	}
> > +
> > +	return result;
> > +}
> > +
> > +/* requires cfg80211_drv_mutex to be held! */
> > +static struct cfg80211_registered_driver *
> > +__cfg80211_drv_from_info(struct genl_info *info)
> > +{
> > +	int ifindex;
> > +	struct cfg80211_registered_driver *bywiphy = NULL, *byifidx = NULL;
> > +	struct net_device *dev;
> > +	int err = -EINVAL;
> > +
> > +	if (info->attrs[NL80211_ATTR_WIPHY]) {
> > +		bywiphy = cfg80211_drv_by_wiphy(
> > +				nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
> > +		err = -ENODEV;
> > +	}
> > +
> > +	if (info->attrs[NL80211_ATTR_IFINDEX]) {
> > +		ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
> > +		dev = dev_get_by_index(ifindex);
> > +		if (dev) {
> > +			byifidx = cfg80211_drv_by_priv(dev->ieee80211_ptr);
> > +			dev_put(dev);
> > +		}
> > +		err = -ENODEV;
> > +	}
> > +
> > +	if (bywiphy && byifidx) {
> > +		if (bywiphy != byifidx)
> > +			return ERR_PTR(-EINVAL);
> > +		else
> > +			return bywiphy; /* == byifidx */
> > +	}
> > +	if (bywiphy)
> > +		return bywiphy;
> > +
> > +	if (byifidx)
> > +		return byifidx;
> > +
> > +	return ERR_PTR(err);
> > +}
> > +
> > +struct cfg80211_registered_driver *
> > +cfg80211_get_drv_from_info(struct genl_info *info)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +
> > +	mutex_lock(&cfg80211_drv_mutex);
> > +	drv = __cfg80211_drv_from_info(info);
> > +
> > +	/* if it is not an error we grab the lock on
> > +	 * it to assure it won't be going away while
> > +	 * we operate on it */
> > +	if (!IS_ERR(drv))
> > +		mutex_lock(&drv->mtx);
> > +
> > +	mutex_unlock(&cfg80211_drv_mutex);
> > +
> > +	return drv;
> > +}
> > +
> > +/* wext will need this */
> > +struct cfg80211_registered_driver *
> > +cfg80211_get_drv_from_ifindex(int ifindex)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	struct net_device *dev;
> > +
> > +	mutex_lock(&cfg80211_drv_mutex);
> > +	dev = dev_get_by_index(ifindex);
> > +	if (!dev)
> > +		return ERR_PTR(-ENODEV);
> > +	drv = cfg80211_drv_by_priv(dev->ieee80211_ptr);
> > +	if (drv)
> > +		mutex_lock(&drv->mtx);
> > +	dev_put(dev);
> > +	if (drv)
> > +		return drv;
> > +	return ERR_PTR(-ENODEV);
> > +}
> > +
> > +void cfg80211_put_drv(struct cfg80211_registered_driver *drv)
> > +{
> > +	BUG_ON(IS_ERR(drv));
> > +	mutex_unlock(&drv->mtx);
> > +}
> > +
> > +/* exported functions */
> > +
> > +int cfg80211_register(struct cfg80211_ops *ops, void *priv)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +	int res;
> > +
> > +	if (!priv || !ops->list_interfaces)
> > +		return -EINVAL;
> > +
> > +	mutex_lock(&cfg80211_drv_mutex);
> > +
> > +	if (cfg80211_drv_by_priv(priv)) {
> > +		res = -EALREADY;
> > +		goto out_unlock;
> > +	}
> > +
> > +	drv = kzalloc(sizeof(struct cfg80211_registered_driver), GFP_KERNEL);
> > +	if (!drv) {
> > +		res = -ENOMEM;
> > +		goto out_unlock;
> > +	}
> > +
> > +	drv->ops = ops;
> > +	drv->priv = priv;
> > +
> > +	if (unlikely(wiphy_counter<0)) {
> > +		/* ugh, wrapped! */
> > +		kfree(drv);
> > +		res = -ENOSPC;
> > +		goto out_unlock;
> > +	}
> > +	mutex_init(&drv->mtx);
> > +	drv->wiphy = wiphy_counter;
> > +	list_add(&drv->list, &cfg80211_drv_list);
> > +	/* return wiphy number */
> > +	res = drv->wiphy;
> > +
> > +	/* now increase counter for the next time */
> > +	wiphy_counter++;
> > +
> > + out_unlock:
> > +	mutex_unlock(&cfg80211_drv_mutex);
> > +	return res;
> > +}
> > +EXPORT_SYMBOL_GPL(cfg80211_register);
> > +
> > +void cfg80211_unregister(void *priv)
> > +{
> > +	struct cfg80211_registered_driver *drv;
> > +
> > +	mutex_lock(&cfg80211_drv_mutex);
> > +	drv = cfg80211_drv_by_priv(priv);
> > +	if (!drv) {
> > +		printk(KERN_ERR "deregistering cfg80211 backend that "
> > +		       " was never registered!\n");
> > +		mutex_unlock(&cfg80211_drv_mutex);
> > +		return;
> > +	}
> > +
> > +	/* hold registered driver mutex during list removal as well
> > +	 * to make sure no commands are in progress at the moment */
> > +	mutex_lock(&drv->mtx);
> > +	list_del(&drv->list);
> > +	mutex_unlock(&drv->mtx);
> > +
> > +	mutex_unlock(&cfg80211_drv_mutex);
> > +
> > +	mutex_destroy(&drv->mtx);
> > +	kfree(drv);
> > +}
> > +EXPORT_SYMBOL_GPL(cfg80211_unregister);
> > +
> > +/* module initialisation/exit functions */
> > +
> > +static int cfg80211_init(void)
> > +{
> > +	/* possibly need to do more later */
> > +	return nl80211_init();
> > +}
> > +
> > +static void cfg80211_exit(void)
> > +{
> > +	/* possibly need to do more later */
> > +	nl80211_exit();
> > +}
> > +
> > +module_init(cfg80211_init);
> > +module_exit(cfg80211_exit);
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/net/wireless/core.h	2006-09-28 00:38:22.734150162 +0200
> > @@ -0,0 +1,57 @@
> > +/*
> > + * Wireless configuration interface internals.
> > + *
> > + * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
> > + */
> > +#ifndef __NET_WIRELESS_CORE_H
> > +#define __NET_WIRELESS_CORE_H
> > +#include <net/cfg80211.h>
> > +#include <linux/mutex.h>
> > +#include <linux/list.h>
> > +#include <net/genetlink.h>
> > +
> > +struct cfg80211_registered_driver {
> > +	struct cfg80211_ops *ops;
> > +	int wiphy;
> > +	void *priv;
> > +	struct list_head list;
> > +	/* we hold this mutex during any call so that
> > +	 * we cannot do multiple calls at once, and also
> > +	 * to avoid the deregister call to proceed while
> > +	 * any call is in progress */
> > +	struct mutex mtx;
> > +};
> > +
> > +extern struct mutex cfg80211_drv_mutex;
> > +extern struct list_head cfg80211_drv_list;
> > +
> > +/*
> > + * This function returns a pointer to the driver
> > + * that the genl_info item that is passed refers to.
> > + * If successful, it returns non-NULL and also locks
> > + * the driver's mutex!
> > + *
> > + * This means that you need to call cfg80211_put_drv()
> > + * before being allowed to acquire &cfg80211_drv_mutex!
> > + *
> > + * This is necessary because we need to lock the global
> > + * mutex to get an item off the list safely, and then
> > + * we lock the drv mutex so it doesn't go away under us.
> > + *
> > + * We don't want to keep cfg80211_drv_mutex locked
> > + * for all the time in order to allow requests on
> > + * other interfaces to go through at the same time.
> > + *
> > + * The result of this can be a PTR_ERR and hence must
> > + * be checked with IS_ERR() for errors.
> > + */
> > +extern struct cfg80211_registered_driver *
> > +cfg80211_get_drv_from_info(struct genl_info *info);
> > +
> > +/* identical to cfg80211_get_drv_from_info but only operate on ifindex */
> > +extern struct cfg80211_registered_driver *
> > +cfg80211_get_drv_from_ifindex(int ifindex);
> > +
> > +extern void cfg80211_put_drv(struct cfg80211_registered_driver *drv);
> > +
> > +#endif /* __NET_WIRELESS_CORE_H */
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/net/wireless/nl80211.h	2006-09-27 19:36:17.744088173 +0200
> > @@ -0,0 +1,7 @@
> > +#ifndef __NET_WIRELESS_NL80211_H
> > +#define __NET_WIRELESS_NL80211_H
> > +
> > +extern int nl80211_init(void);
> > +extern void nl80211_exit(void);
> > +
> > +#endif /* __NET_WIRELESS_NL80211_H */
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ wireless-dev/net/wireless/wext-compat.c	2006-09-28 00:38:55.304150162 +0200
> > @@ -0,0 +1,25 @@
> > +/* NOT YET */
> > +
> > +To implement compatibility, we add a new field to struct net_device
> > +that contains the pending configuration structure. This is dynamically
> > +allocated when needed and freed when committed.
> > +In a way it replaces the wireless_handlers field in there which is now
> > +done by dynamic lookup. No worries. No one is going to have thousands
> > +of wireless devices, and if that changes we can still trivially change
> > +this assumption :)
> > +
> > +Commit is done some time after the last parameter was changed
> > +(with each parameter change simply (re-)schedule a timer) or
> > +if explicitly asked for. This is probably not what most people
> > +would expect, but perfectly fine in the WE API.
> > +
> > +compatibility mappings:
> > +
> > +SIOCSIWAP
> > +  -> if bssid is all-ones: set roaming to kernel, reassociate
> > +  -> if bssid is all-zeroes: set roaming to kernel
> > +  -> otherwise: set roaming to userspace, set bssid
> > +
> > +SIOCGIWAP
> > +  -> get association parameters and fill return bssid appropriately
> > +
> > 
> > -
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