| /* |
| * 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); |