+++ /dev/null
-/*
- * 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 <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 reinitialized 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: "
- "%pM, Dev: %02x:%02x) is not connected.\n",
- eth_addr, 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);
git.openpandora.org / pandora-kernel.git / blobdiff