linux/drivers/uwb/wlp/wss-lc.c

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/*
* WiMedia Logical Link Control Protocol (WLP)
*
* Copyright (C) 2007 Intel Corporation
* Reinette Chatre <reinette.chatre@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* Implementation of the WLP association protocol.
*
* FIXME: Docs
*
* A UWB network interface will configure a WSS through wlp_wss_setup() after
* the interface has been assigned a MAC address, typically after
* "ifconfig" has been called. When the interface goes down it should call
* wlp_wss_remove().
*
* When the WSS is ready for use the user interacts via sysfs to create,
* discover, and activate WSS.
*
* wlp_wss_enroll_activate()
*
* wlp_wss_create_activate()
* wlp_wss_set_wssid_hash()
* wlp_wss_comp_wssid_hash()
* wlp_wss_sel_bcast_addr()
* wlp_wss_sysfs_add()
*
* Called when no more references to WSS exist:
* wlp_wss_release()
* wlp_wss_reset()
*/
#include <linux/etherdevice.h> /* for is_valid_ether_addr */
#include <linux/skbuff.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/wlp.h>
#include "wlp-internal.h"
size_t wlp_wss_key_print(char *buf, size_t bufsize, u8 *key)
{
size_t result;
result = scnprintf(buf, bufsize,
"%02x %02x %02x %02x %02x %02x "
"%02x %02x %02x %02x %02x %02x "
"%02x %02x %02x %02x",
key[0], key[1], key[2], key[3],
key[4], key[5], key[6], key[7],
key[8], key[9], key[10], key[11],
key[12], key[13], key[14], key[15]);
return result;
}
/**
* Compute WSSID hash
* WLP Draft 0.99 [7.2.1]
*
* The WSSID hash for a WSSID is the result of an octet-wise exclusive-OR
* of all octets in the WSSID.
*/
static
u8 wlp_wss_comp_wssid_hash(struct wlp_uuid *wssid)
{
return wssid->data[0] ^ wssid->data[1] ^ wssid->data[2]
^ wssid->data[3] ^ wssid->data[4] ^ wssid->data[5]
^ wssid->data[6] ^ wssid->data[7] ^ wssid->data[8]
^ wssid->data[9] ^ wssid->data[10] ^ wssid->data[11]
^ wssid->data[12] ^ wssid->data[13] ^ wssid->data[14]
^ wssid->data[15];
}
/**
* Select a multicast EUI-48 for the WSS broadcast address.
* WLP Draft 0.99 [7.2.1]
*
* Selected based on the WiMedia Alliance OUI, 00-13-88, within the WLP
* range, [01-13-88-00-01-00, 01-13-88-00-01-FF] inclusive.
*
* This address is currently hardcoded.
* FIXME?
*/
static
struct uwb_mac_addr wlp_wss_sel_bcast_addr(struct wlp_wss *wss)
{
struct uwb_mac_addr bcast = {
.data = { 0x01, 0x13, 0x88, 0x00, 0x01, 0x00 }
};
return bcast;
}
/**
* Clear the contents of the WSS structure - all except kobj, mutex, virtual
*
* We do not want to reinitialize - the internal kobj should not change as
* it still points to the parent received during setup. The mutex should
* remain also. We thus just reset values individually.
* The virutal address assigned to WSS will remain the same for the
* lifetime of the WSS. We only reset the fields that can change during its
* lifetime.
*/
void wlp_wss_reset(struct wlp_wss *wss)
{
memset(&wss->wssid, 0, sizeof(wss->wssid));
wss->hash = 0;
memset(&wss->name[0], 0, sizeof(wss->name));
memset(&wss->bcast, 0, sizeof(wss->bcast));
wss->secure_status = WLP_WSS_UNSECURE;
memset(&wss->master_key[0], 0, sizeof(wss->master_key));
wss->tag = 0;
wss->state = WLP_WSS_STATE_NONE;
}
/**
* Create sysfs infrastructure for WSS
*
* The WSS is configured to have the interface as parent (see wlp_wss_setup())
* a new sysfs directory that includes wssid as its name is created in the
* interface's sysfs directory. The group of files interacting with WSS are
* created also.
*/
static
int wlp_wss_sysfs_add(struct wlp_wss *wss, char *wssid_str)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
int result;
result = kobject_set_name(&wss->kobj, "wss-%s", wssid_str);
if (result < 0)
return result;
wss->kobj.ktype = &wss_ktype;
result = kobject_init_and_add(&wss->kobj,
&wss_ktype, wss->kobj.parent, "wlp");
if (result < 0) {
dev_err(dev, "WLP: Cannot register WSS kobject.\n");
goto error_kobject_register;
}
result = sysfs_create_group(&wss->kobj, &wss_attr_group);
if (result < 0) {
dev_err(dev, "WLP: Cannot register WSS attributes: %d\n",
result);
goto error_sysfs_create_group;
}
return 0;
error_sysfs_create_group:
kobject_put(&wss->kobj); /* will free name if needed */
return result;
error_kobject_register:
kfree(wss->kobj.name);
wss->kobj.name = NULL;
wss->kobj.ktype = NULL;
return result;
}
/**
* Release WSS
*
* No more references exist to this WSS. We should undo everything that was
* done in wlp_wss_create_activate() except removing the group. The group
* is not removed because an object can be unregistered before the group is
* created. We also undo any additional operations on the WSS after this
* (addition of members).
*
* If memory was allocated for the kobject's name then it will
* be freed by the kobject system during this time.
*
* The EDA cache is removed and reinitilized when the WSS is removed. We
* thus loose knowledge of members of this WSS at that time and need not do
* it here.
*/
void wlp_wss_release(struct kobject *kobj)
{
struct wlp_wss *wss = container_of(kobj, struct wlp_wss, kobj);
wlp_wss_reset(wss);
}
/**
* Enroll into a WSS using provided neighbor as registrar
*
* First search the neighborhood information to learn which neighbor is
* referred to, next proceed with enrollment.
*
* &wss->mutex is held
*/
static
int wlp_wss_enroll_target(struct wlp_wss *wss, struct wlp_uuid *wssid,
struct uwb_dev_addr *dest)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
struct wlp_neighbor_e *neighbor;
int result = -ENXIO;
struct uwb_dev_addr *dev_addr;
mutex_lock(&wlp->nbmutex);
list_for_each_entry(neighbor, &wlp->neighbors, node) {
dev_addr = &neighbor->uwb_dev->dev_addr;
if (!memcmp(dest, dev_addr, sizeof(*dest))) {
result = wlp_enroll_neighbor(wlp, neighbor, wss, wssid);
break;
}
}
if (result == -ENXIO)
dev_err(dev, "WLP: Cannot find neighbor %02x:%02x. \n",
dest->data[1], dest->data[0]);
mutex_unlock(&wlp->nbmutex);
return result;
}
/**
* Enroll into a WSS previously discovered
*
* User provides WSSID of WSS, search for neighbor that has this WSS
* activated and attempt to enroll.
*
* &wss->mutex is held
*/
static
int wlp_wss_enroll_discovered(struct wlp_wss *wss, struct wlp_uuid *wssid)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
struct wlp_neighbor_e *neighbor;
struct wlp_wssid_e *wssid_e;
char buf[WLP_WSS_UUID_STRSIZE];
int result = -ENXIO;
mutex_lock(&wlp->nbmutex);
list_for_each_entry(neighbor, &wlp->neighbors, node) {
list_for_each_entry(wssid_e, &neighbor->wssid, node) {
if (!memcmp(wssid, &wssid_e->wssid, sizeof(*wssid))) {
result = wlp_enroll_neighbor(wlp, neighbor,
wss, wssid);
if (result == 0) /* enrollment success */
goto out;
break;
}
}
}
out:
if (result == -ENXIO) {
wlp_wss_uuid_print(buf, sizeof(buf), wssid);
dev_err(dev, "WLP: Cannot find WSSID %s in cache. \n", buf);
}
mutex_unlock(&wlp->nbmutex);
return result;
}
/**
* Enroll into WSS with provided WSSID, registrar may be provided
*
* @wss: out WSS that will be enrolled
* @wssid: wssid of neighboring WSS that we want to enroll in
* @devaddr: registrar can be specified, will be broadcast (ff:ff) if any
* neighbor can be used as registrar.
*
* &wss->mutex is held
*/
static
int wlp_wss_enroll(struct wlp_wss *wss, struct wlp_uuid *wssid,
struct uwb_dev_addr *devaddr)
{
int result;
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
char buf[WLP_WSS_UUID_STRSIZE];
struct uwb_dev_addr bcast = {.data = {0xff, 0xff} };
wlp_wss_uuid_print(buf, sizeof(buf), wssid);
if (wss->state != WLP_WSS_STATE_NONE) {
dev_err(dev, "WLP: Already enrolled in WSS %s.\n", buf);
result = -EEXIST;
goto error;
}
if (!memcmp(&bcast, devaddr, sizeof(bcast)))
result = wlp_wss_enroll_discovered(wss, wssid);
else
result = wlp_wss_enroll_target(wss, wssid, devaddr);
if (result < 0) {
dev_err(dev, "WLP: Unable to enroll into WSS %s, result %d \n",
buf, result);
goto error;
}
dev_dbg(dev, "Successfully enrolled into WSS %s \n", buf);
result = wlp_wss_sysfs_add(wss, buf);
if (result < 0) {
dev_err(dev, "WLP: Unable to set up sysfs for WSS kobject.\n");
wlp_wss_reset(wss);
}
error:
return result;
}
/**
* Activate given WSS
*
* Prior to activation a WSS must be enrolled. To activate a WSS a device
* includes the WSS hash in the WLP IE in its beacon in each superframe.
* WLP 0.99 [7.2.5].
*
* The WSS tag is also computed at this time. We only support one activated
* WSS so we can use the hash as a tag - there will never be a conflict.
*
* We currently only support one activated WSS so only one WSS hash is
* included in the WLP IE.
*/
static
int wlp_wss_activate(struct wlp_wss *wss)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
struct uwb_rc *uwb_rc = wlp->rc;
int result;
struct {
struct wlp_ie wlp_ie;
u8 hash; /* only include one hash */
} ie_data;
BUG_ON(wss->state != WLP_WSS_STATE_ENROLLED);
wss->hash = wlp_wss_comp_wssid_hash(&wss->wssid);
wss->tag = wss->hash;
memset(&ie_data, 0, sizeof(ie_data));
ie_data.wlp_ie.hdr.element_id = UWB_IE_WLP;
ie_data.wlp_ie.hdr.length = sizeof(ie_data) - sizeof(struct uwb_ie_hdr);
wlp_ie_set_hash_length(&ie_data.wlp_ie, sizeof(ie_data.hash));
ie_data.hash = wss->hash;
result = uwb_rc_ie_add(uwb_rc, &ie_data.wlp_ie.hdr,
sizeof(ie_data));
if (result < 0) {
dev_err(dev, "WLP: Unable to add WLP IE to beacon. "
"result = %d.\n", result);
goto error_wlp_ie;
}
wss->state = WLP_WSS_STATE_ACTIVE;
result = 0;
error_wlp_ie:
return result;
}
/**
* Enroll in and activate WSS identified by provided WSSID
*
* The neighborhood cache should contain a list of all neighbors and the
* WSS they have activated. Based on that cache we search which neighbor we
* can perform the association process with. The user also has option to
* specify which neighbor it prefers as registrar.
* Successful enrollment is followed by activation.
* Successful activation will create the sysfs directory containing
* specific information regarding this WSS.
*/
int wlp_wss_enroll_activate(struct wlp_wss *wss, struct wlp_uuid *wssid,
struct uwb_dev_addr *devaddr)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
int result = 0;
char buf[WLP_WSS_UUID_STRSIZE];
mutex_lock(&wss->mutex);
result = wlp_wss_enroll(wss, wssid, devaddr);
if (result < 0) {
wlp_wss_uuid_print(buf, sizeof(buf), &wss->wssid);
dev_err(dev, "WLP: Enrollment into WSS %s failed.\n", buf);
goto error_enroll;
}
result = wlp_wss_activate(wss);
if (result < 0) {
dev_err(dev, "WLP: Unable to activate WSS. Undoing enrollment "
"result = %d \n", result);
/* Undo enrollment */
wlp_wss_reset(wss);
goto error_activate;
}
error_activate:
error_enroll:
mutex_unlock(&wss->mutex);
return result;
}
/**
* Create, enroll, and activate a new WSS
*
* @wssid: new wssid provided by user
* @name: WSS name requested by used.
* @sec_status: security status requested by user
*
* A user requested the creation of a new WSS. All operations are done
* locally. The new WSS will be stored locally, the hash will be included
* in the WLP IE, and the sysfs infrastructure for this WSS will be
* created.
*/
int wlp_wss_create_activate(struct wlp_wss *wss, struct wlp_uuid *wssid,
char *name, unsigned sec_status, unsigned accept)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
int result = 0;
char buf[WLP_WSS_UUID_STRSIZE];
result = wlp_wss_uuid_print(buf, sizeof(buf), wssid);
if (!mutex_trylock(&wss->mutex)) {
dev_err(dev, "WLP: WLP association session in progress.\n");
return -EBUSY;
}
if (wss->state != WLP_WSS_STATE_NONE) {
dev_err(dev, "WLP: WSS already exists. Not creating new.\n");
result = -EEXIST;
goto out;
}
if (wss->kobj.parent == NULL) {
dev_err(dev, "WLP: WSS parent not ready. Is network interface "
"up?\n");
result = -ENXIO;
goto out;
}
if (sec_status == WLP_WSS_SECURE) {
dev_err(dev, "WLP: FIXME Creation of secure WSS not "
"supported yet.\n");
result = -EINVAL;
goto out;
}
wss->wssid = *wssid;
memcpy(wss->name, name, sizeof(wss->name));
wss->bcast = wlp_wss_sel_bcast_addr(wss);
wss->secure_status = sec_status;
wss->accept_enroll = accept;
/*wss->virtual_addr is initialized in call to wlp_wss_setup*/
/* sysfs infrastructure */
result = wlp_wss_sysfs_add(wss, buf);
if (result < 0) {
dev_err(dev, "Cannot set up sysfs for WSS kobject.\n");
wlp_wss_reset(wss);
goto out;
} else
result = 0;
wss->state = WLP_WSS_STATE_ENROLLED;
result = wlp_wss_activate(wss);
if (result < 0) {
dev_err(dev, "WLP: Unable to activate WSS. Undoing "
"enrollment\n");
wlp_wss_reset(wss);
goto out;
}
result = 0;
out:
mutex_unlock(&wss->mutex);
return result;
}
/**
* Determine if neighbor has WSS activated
*
* @returns: 1 if neighbor has WSS activated, zero otherwise
*
* This can be done in two ways:
* - send a C1 frame, parse C2/F0 response
* - examine the WLP IE sent by the neighbor
*
* The WLP IE is not fully supported in hardware so we use the C1/C2 frame
* exchange to determine if a WSS is activated. Using the WLP IE should be
* faster and should be used when it becomes possible.
*/
int wlp_wss_is_active(struct wlp *wlp, struct wlp_wss *wss,
struct uwb_dev_addr *dev_addr)
{
int result = 0;
struct device *dev = &wlp->rc->uwb_dev.dev;
DECLARE_COMPLETION_ONSTACK(completion);
struct wlp_session session;
struct sk_buff *skb;
struct wlp_frame_assoc *resp;
struct wlp_uuid wssid;
mutex_lock(&wlp->mutex);
/* Send C1 association frame */
result = wlp_send_assoc_frame(wlp, wss, dev_addr, WLP_ASSOC_C1);
if (result < 0) {
dev_err(dev, "Unable to send C1 frame to neighbor "
"%02x:%02x (%d)\n", dev_addr->data[1],
dev_addr->data[0], result);
result = 0;
goto out;
}
/* Create session, wait for response */
session.exp_message = WLP_ASSOC_C2;
session.cb = wlp_session_cb;
session.cb_priv = &completion;
session.neighbor_addr = *dev_addr;
BUG_ON(wlp->session != NULL);
wlp->session = &session;
/* Wait for C2/F0 frame */
result = wait_for_completion_interruptible_timeout(&completion,
WLP_PER_MSG_TIMEOUT * HZ);
if (result == 0) {
dev_err(dev, "Timeout while sending C1 to neighbor "
"%02x:%02x.\n", dev_addr->data[1],
dev_addr->data[0]);
goto out;
}
if (result < 0) {
dev_err(dev, "Unable to send C1 to neighbor %02x:%02x.\n",
dev_addr->data[1], dev_addr->data[0]);
result = 0;
goto out;
}
/* Parse message in session->data: it will be either C2 or F0 */
skb = session.data;
resp = (void *) skb->data;
if (resp->type == WLP_ASSOC_F0) {
result = wlp_parse_f0(wlp, skb);
if (result < 0)
dev_err(dev, "WLP: unable to parse incoming F0 "
"frame from neighbor %02x:%02x.\n",
dev_addr->data[1], dev_addr->data[0]);
result = 0;
goto error_resp_parse;
}
/* WLP version and message type fields have already been parsed */
result = wlp_get_wssid(wlp, (void *)resp + sizeof(*resp), &wssid,
skb->len - sizeof(*resp));
if (result < 0) {
dev_err(dev, "WLP: unable to obtain WSSID from C2 frame.\n");
result = 0;
goto error_resp_parse;
}
if (!memcmp(&wssid, &wss->wssid, sizeof(wssid)))
result = 1;
else {
dev_err(dev, "WLP: Received a C2 frame without matching "
"WSSID.\n");
result = 0;
}
error_resp_parse:
kfree_skb(skb);
out:
wlp->session = NULL;
mutex_unlock(&wlp->mutex);
return result;
}
/**
* Activate connection with neighbor by updating EDA cache
*
* @wss: local WSS to which neighbor wants to connect
* @dev_addr: neighbor's address
* @wssid: neighbor's WSSID - must be same as our WSS's WSSID
* @tag: neighbor's WSS tag used to identify frames transmitted by it
* @virt_addr: neighbor's virtual EUI-48
*/
static
int wlp_wss_activate_connection(struct wlp *wlp, struct wlp_wss *wss,
struct uwb_dev_addr *dev_addr,
struct wlp_uuid *wssid, u8 *tag,
struct uwb_mac_addr *virt_addr)
{
struct device *dev = &wlp->rc->uwb_dev.dev;
int result = 0;
if (!memcmp(wssid, &wss->wssid, sizeof(*wssid))) {
/* Update EDA cache */
result = wlp_eda_update_node(&wlp->eda, dev_addr, wss,
(void *) virt_addr->data, *tag,
WLP_WSS_CONNECTED);
if (result < 0)
dev_err(dev, "WLP: Unable to update EDA cache "
"with new connected neighbor information.\n");
} else {
dev_err(dev, "WLP: Neighbor does not have matching WSSID.\n");
result = -EINVAL;
}
return result;
}
/**
* Connect to WSS neighbor
*
* Use C3/C4 exchange to determine if neighbor has WSS activated and
* retrieve the WSS tag and virtual EUI-48 of the neighbor.
*/
static
int wlp_wss_connect_neighbor(struct wlp *wlp, struct wlp_wss *wss,
struct uwb_dev_addr *dev_addr)
{
int result;
struct device *dev = &wlp->rc->uwb_dev.dev;
struct wlp_uuid wssid;
u8 tag;
struct uwb_mac_addr virt_addr;
DECLARE_COMPLETION_ONSTACK(completion);
struct wlp_session session;
struct wlp_frame_assoc *resp;
struct sk_buff *skb;
mutex_lock(&wlp->mutex);
/* Send C3 association frame */
result = wlp_send_assoc_frame(wlp, wss, dev_addr, WLP_ASSOC_C3);
if (result < 0) {
dev_err(dev, "Unable to send C3 frame to neighbor "
"%02x:%02x (%d)\n", dev_addr->data[1],
dev_addr->data[0], result);
goto out;
}
/* Create session, wait for response */
session.exp_message = WLP_ASSOC_C4;
session.cb = wlp_session_cb;
session.cb_priv = &completion;
session.neighbor_addr = *dev_addr;
BUG_ON(wlp->session != NULL);
wlp->session = &session;
/* Wait for C4/F0 frame */
result = wait_for_completion_interruptible_timeout(&completion,
WLP_PER_MSG_TIMEOUT * HZ);
if (result == 0) {
dev_err(dev, "Timeout while sending C3 to neighbor "
"%02x:%02x.\n", dev_addr->data[1],
dev_addr->data[0]);
result = -ETIMEDOUT;
goto out;
}
if (result < 0) {
dev_err(dev, "Unable to send C3 to neighbor %02x:%02x.\n",
dev_addr->data[1], dev_addr->data[0]);
goto out;
}
/* Parse message in session->data: it will be either C4 or F0 */
skb = session.data;
resp = (void *) skb->data;
if (resp->type == WLP_ASSOC_F0) {
result = wlp_parse_f0(wlp, skb);
if (result < 0)
dev_err(dev, "WLP: unable to parse incoming F0 "
"frame from neighbor %02x:%02x.\n",
dev_addr->data[1], dev_addr->data[0]);
result = -EINVAL;
goto error_resp_parse;
}
result = wlp_parse_c3c4_frame(wlp, skb, &wssid, &tag, &virt_addr);
if (result < 0) {
dev_err(dev, "WLP: Unable to parse C4 frame from neighbor.\n");
goto error_resp_parse;
}
result = wlp_wss_activate_connection(wlp, wss, dev_addr, &wssid, &tag,
&virt_addr);
if (result < 0) {
dev_err(dev, "WLP: Unable to activate connection to "
"neighbor %02x:%02x.\n", dev_addr->data[1],
dev_addr->data[0]);
goto error_resp_parse;
}
error_resp_parse:
kfree_skb(skb);
out:
/* Record that we unsuccessfully tried to connect to this neighbor */
if (result < 0)
wlp_eda_update_node_state(&wlp->eda, dev_addr,
WLP_WSS_CONNECT_FAILED);
wlp->session = NULL;
mutex_unlock(&wlp->mutex);
return result;
}
/**
* Connect to neighbor with common WSS, send pending frame
*
* This function is scheduled when a frame is destined to a neighbor with
* which we do not have a connection. A copy of the EDA cache entry is
* provided - not the actual cache entry (because it is protected by a
* spinlock).
*
* First determine if neighbor has the same WSS activated, connect if it
* does. The C3/C4 exchange is dual purpose to determine if neighbor has
* WSS activated and proceed with the connection.
*
* The frame that triggered the connection setup is sent after connection
* setup.
*
* network queue is stopped - we need to restart when done
*
*/
static
void wlp_wss_connect_send(struct work_struct *ws)
{
struct wlp_assoc_conn_ctx *conn_ctx = container_of(ws,
struct wlp_assoc_conn_ctx,
ws);
struct wlp *wlp = conn_ctx->wlp;
struct sk_buff *skb = conn_ctx->skb;
struct wlp_eda_node *eda_entry = &conn_ctx->eda_entry;
struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr;
struct wlp_wss *wss = &wlp->wss;
int result;
struct device *dev = &wlp->rc->uwb_dev.dev;
mutex_lock(&wss->mutex);
if (wss->state < WLP_WSS_STATE_ACTIVE) {
if (printk_ratelimit())
dev_err(dev, "WLP: Attempting to connect with "
"WSS that is not active or connected.\n");
dev_kfree_skb(skb);
goto out;
}
/* Establish connection - send C3 rcv C4 */
result = wlp_wss_connect_neighbor(wlp, wss, dev_addr);
if (result < 0) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to establish connection "
"with neighbor %02x:%02x.\n",
dev_addr->data[1], dev_addr->data[0]);
dev_kfree_skb(skb);
goto out;
}
/* EDA entry changed, update the local copy being used */
result = wlp_copy_eda_node(&wlp->eda, dev_addr, eda_entry);
if (result < 0) {
if (printk_ratelimit())
dev_err(dev, "WLP: Cannot find EDA entry for "
"neighbor %02x:%02x \n",
dev_addr->data[1], dev_addr->data[0]);
}
result = wlp_wss_prep_hdr(wlp, eda_entry, skb);
if (result < 0) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to prepare frame header for "
"transmission (neighbor %02x:%02x). \n",
dev_addr->data[1], dev_addr->data[0]);
dev_kfree_skb(skb);
goto out;
}
BUG_ON(wlp->xmit_frame == NULL);
result = wlp->xmit_frame(wlp, skb, dev_addr);
if (result < 0) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to transmit frame: %d\n",
result);
if (result == -ENXIO)
dev_err(dev, "WLP: Is network interface up? \n");
/* We could try again ... */
dev_kfree_skb(skb);/*we need to free if tx fails */
}
out:
kfree(conn_ctx);
BUG_ON(wlp->start_queue == NULL);
wlp->start_queue(wlp);
mutex_unlock(&wss->mutex);
}
/**
* Add WLP header to outgoing skb
*
* @eda_entry: pointer to neighbor's entry in the EDA cache
* @_skb: skb containing data destined to the neighbor
*/
int wlp_wss_prep_hdr(struct wlp *wlp, struct wlp_eda_node *eda_entry,
void *_skb)
{
struct device *dev = &wlp->rc->uwb_dev.dev;
int result = 0;
unsigned char *eth_addr = eda_entry->eth_addr;
struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr;
struct sk_buff *skb = _skb;
struct wlp_frame_std_abbrv_hdr *std_hdr;
if (eda_entry->state == WLP_WSS_CONNECTED) {
/* Add WLP header */
BUG_ON(skb_headroom(skb) < sizeof(*std_hdr));
std_hdr = (void *) __skb_push(skb, sizeof(*std_hdr));
std_hdr->hdr.mux_hdr = cpu_to_le16(WLP_PROTOCOL_ID);
std_hdr->hdr.type = WLP_FRAME_STANDARD;
std_hdr->tag = eda_entry->wss->tag;
} else {
if (printk_ratelimit())
dev_err(dev, "WLP: Destination neighbor (Ethernet: "
"%02x:%02x:%02x:%02x:%02x:%02x, Dev: "
"%02x:%02x) is not connected. \n", eth_addr[0],
eth_addr[1], eth_addr[2], eth_addr[3],
eth_addr[4], eth_addr[5], dev_addr->data[1],
dev_addr->data[0]);
result = -EINVAL;
}
return result;
}
/**
* Prepare skb for neighbor: connect if not already and prep WLP header
*
* This function is called in interrupt context, but it needs to sleep. We
* temporarily stop the net queue to establish the WLP connection.
* Setup of the WLP connection and restart of queue is scheduled
* on the default work queue.
*
* run with eda->lock held (spinlock)
*/
int wlp_wss_connect_prep(struct wlp *wlp, struct wlp_eda_node *eda_entry,
void *_skb)
{
int result = 0;
struct device *dev = &wlp->rc->uwb_dev.dev;
struct sk_buff *skb = _skb;
struct wlp_assoc_conn_ctx *conn_ctx;
if (eda_entry->state == WLP_WSS_UNCONNECTED) {
/* We don't want any more packets while we set up connection */
BUG_ON(wlp->stop_queue == NULL);
wlp->stop_queue(wlp);
conn_ctx = kmalloc(sizeof(*conn_ctx), GFP_ATOMIC);
if (conn_ctx == NULL) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to allocate memory "
"for connection handling.\n");
result = -ENOMEM;
goto out;
}
conn_ctx->wlp = wlp;
conn_ctx->skb = skb;
conn_ctx->eda_entry = *eda_entry;
INIT_WORK(&conn_ctx->ws, wlp_wss_connect_send);
schedule_work(&conn_ctx->ws);
result = 1;
} else if (eda_entry->state == WLP_WSS_CONNECT_FAILED) {
/* Previous connection attempts failed, don't retry - see
* conditions for connection in WLP 0.99 [7.6.2] */
if (printk_ratelimit())
dev_err(dev, "Could not connect to neighbor "
"previously. Not retrying. \n");
result = -ENONET;
goto out;
} else /* eda_entry->state == WLP_WSS_CONNECTED */
result = wlp_wss_prep_hdr(wlp, eda_entry, skb);
out:
return result;
}
/**
* Emulate broadcast: copy skb, send copy to neighbor (connect if not already)
*
* We need to copy skbs in the case where we emulate broadcast through
* unicast. We copy instead of clone because we are modifying the data of
* the frame after copying ... clones share data so we cannot emulate
* broadcast using clones.
*
* run with eda->lock held (spinlock)
*/
int wlp_wss_send_copy(struct wlp *wlp, struct wlp_eda_node *eda_entry,
void *_skb)
{
int result = -ENOMEM;
struct device *dev = &wlp->rc->uwb_dev.dev;
struct sk_buff *skb = _skb;
struct sk_buff *copy;
struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr;
copy = skb_copy(skb, GFP_ATOMIC);
if (copy == NULL) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to copy skb for "
"transmission.\n");
goto out;
}
result = wlp_wss_connect_prep(wlp, eda_entry, copy);
if (result < 0) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to connect/send skb "
"to neighbor.\n");
dev_kfree_skb_irq(copy);
goto out;
} else if (result == 1)
/* Frame will be transmitted separately */
goto out;
BUG_ON(wlp->xmit_frame == NULL);
result = wlp->xmit_frame(wlp, copy, dev_addr);
if (result < 0) {
if (printk_ratelimit())
dev_err(dev, "WLP: Unable to transmit frame: %d\n",
result);
if ((result == -ENXIO) && printk_ratelimit())
dev_err(dev, "WLP: Is network interface up? \n");
/* We could try again ... */
dev_kfree_skb_irq(copy);/*we need to free if tx fails */
}
out:
return result;
}
/**
* Setup WSS
*
* Should be called by network driver after the interface has been given a
* MAC address.
*/
int wlp_wss_setup(struct net_device *net_dev, struct wlp_wss *wss)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
struct device *dev = &wlp->rc->uwb_dev.dev;
int result = 0;
mutex_lock(&wss->mutex);
wss->kobj.parent = &net_dev->dev.kobj;
if (!is_valid_ether_addr(net_dev->dev_addr)) {
dev_err(dev, "WLP: Invalid MAC address. Cannot use for"
"virtual.\n");
result = -EINVAL;
goto out;
}
memcpy(wss->virtual_addr.data, net_dev->dev_addr,
sizeof(wss->virtual_addr.data));
out:
mutex_unlock(&wss->mutex);
return result;
}
EXPORT_SYMBOL_GPL(wlp_wss_setup);
/**
* Remove WSS
*
* Called by client that configured WSS through wlp_wss_setup(). This
* function is called when client no longer needs WSS, eg. client shuts
* down.
*
* We remove the WLP IE from the beacon before initiating local cleanup.
*/
void wlp_wss_remove(struct wlp_wss *wss)
{
struct wlp *wlp = container_of(wss, struct wlp, wss);
mutex_lock(&wss->mutex);
if (wss->state == WLP_WSS_STATE_ACTIVE)
uwb_rc_ie_rm(wlp->rc, UWB_IE_WLP);
if (wss->state != WLP_WSS_STATE_NONE) {
sysfs_remove_group(&wss->kobj, &wss_attr_group);
kobject_put(&wss->kobj);
}
wss->kobj.parent = NULL;
memset(&wss->virtual_addr, 0, sizeof(wss->virtual_addr));
/* Cleanup EDA cache */
wlp_eda_release(&wlp->eda);
wlp_eda_init(&wlp->eda);
mutex_unlock(&wss->mutex);
}
EXPORT_SYMBOL_GPL(wlp_wss_remove);