![David Vrabel](/assets/img/avatar_default.png)
The current identification IE doesn't include any useful information (the vendor ID is from the EUI-48) and it causes problems with certain hardware/firmware so don't transmit one. Signed-off-by: David Vrabel <david.vrabel@csr.com>
542 lines
16 KiB
C
542 lines
16 KiB
C
/*
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* Ultra Wide Band
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* Information Element Handling
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* Reinette Chatre <reinette.chatre@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* FIXME: docs
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*/
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#include "uwb-internal.h"
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#define D_LOCAL 0
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#include <linux/uwb/debug.h>
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/**
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* uwb_ie_next - get the next IE in a buffer
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* @ptr: start of the buffer containing the IE data
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* @len: length of the buffer
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*
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* Both @ptr and @len are updated so subsequent calls to uwb_ie_next()
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* will get the next IE.
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*
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* NULL is returned (and @ptr and @len will not be updated) if there
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* are no more IEs in the buffer or the buffer is too short.
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*/
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struct uwb_ie_hdr *uwb_ie_next(void **ptr, size_t *len)
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{
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struct uwb_ie_hdr *hdr;
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size_t ie_len;
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if (*len < sizeof(struct uwb_ie_hdr))
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return NULL;
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hdr = *ptr;
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ie_len = sizeof(struct uwb_ie_hdr) + hdr->length;
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if (*len < ie_len)
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return NULL;
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*ptr += ie_len;
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*len -= ie_len;
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return hdr;
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}
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EXPORT_SYMBOL_GPL(uwb_ie_next);
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/**
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* Get the IEs that a radio controller is sending in its beacon
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*
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* @uwb_rc: UWB Radio Controller
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* @returns: Size read from the system
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*
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* We don't need to lock the uwb_rc's mutex because we don't modify
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* anything. Once done with the iedata buffer, call
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* uwb_rc_ie_release(iedata). Don't call kfree on it.
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*/
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ssize_t uwb_rc_get_ie(struct uwb_rc *uwb_rc, struct uwb_rc_evt_get_ie **pget_ie)
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{
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ssize_t result;
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struct device *dev = &uwb_rc->uwb_dev.dev;
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struct uwb_rccb *cmd = NULL;
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struct uwb_rceb *reply = NULL;
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struct uwb_rc_evt_get_ie *get_ie;
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d_fnstart(3, dev, "(%p, %p)\n", uwb_rc, pget_ie);
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result = -ENOMEM;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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if (cmd == NULL)
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goto error_kzalloc;
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cmd->bCommandType = UWB_RC_CET_GENERAL;
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cmd->wCommand = cpu_to_le16(UWB_RC_CMD_GET_IE);
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result = uwb_rc_vcmd(uwb_rc, "GET_IE", cmd, sizeof(*cmd),
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UWB_RC_CET_GENERAL, UWB_RC_CMD_GET_IE,
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&reply);
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if (result < 0)
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goto error_cmd;
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get_ie = container_of(reply, struct uwb_rc_evt_get_ie, rceb);
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if (result < sizeof(*get_ie)) {
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dev_err(dev, "not enough data returned for decoding GET IE "
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"(%zu bytes received vs %zu needed)\n",
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result, sizeof(*get_ie));
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result = -EINVAL;
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} else if (result < sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength)) {
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dev_err(dev, "not enough data returned for decoding GET IE "
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"payload (%zu bytes received vs %zu needed)\n", result,
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sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength));
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result = -EINVAL;
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} else
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*pget_ie = get_ie;
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error_cmd:
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kfree(cmd);
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error_kzalloc:
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d_fnend(3, dev, "(%p, %p) = %d\n", uwb_rc, pget_ie, (int)result);
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return result;
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}
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EXPORT_SYMBOL_GPL(uwb_rc_get_ie);
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/*
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* Given a pointer to an IE, print it in ASCII/hex followed by a new line
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*
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* @ie_hdr: pointer to the IE header. Length is in there, and it is
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* guaranteed that the ie_hdr->length bytes following it are
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* safely accesible.
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*
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* @_data: context data passed from uwb_ie_for_each(), an struct output_ctx
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*/
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int uwb_ie_dump_hex(struct uwb_dev *uwb_dev, const struct uwb_ie_hdr *ie_hdr,
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size_t offset, void *_ctx)
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{
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struct uwb_buf_ctx *ctx = _ctx;
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const u8 *pl = (void *)(ie_hdr + 1);
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u8 pl_itr;
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ctx->bytes += scnprintf(ctx->buf + ctx->bytes, ctx->size - ctx->bytes,
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"%02x %02x ", (unsigned) ie_hdr->element_id,
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(unsigned) ie_hdr->length);
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pl_itr = 0;
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while (pl_itr < ie_hdr->length && ctx->bytes < ctx->size)
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ctx->bytes += scnprintf(ctx->buf + ctx->bytes,
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ctx->size - ctx->bytes,
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"%02x ", (unsigned) pl[pl_itr++]);
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if (ctx->bytes < ctx->size)
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ctx->buf[ctx->bytes++] = '\n';
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return 0;
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}
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EXPORT_SYMBOL_GPL(uwb_ie_dump_hex);
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/**
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* Verify that a pointer in a buffer points to valid IE
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*
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* @start: pointer to start of buffer in which IE appears
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* @itr: pointer to IE inside buffer that will be verified
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* @top: pointer to end of buffer
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*
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* @returns: 0 if IE is valid, <0 otherwise
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*
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* Verification involves checking that the buffer can contain a
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* header and the amount of data reported in the IE header can be found in
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* the buffer.
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*/
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static
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int uwb_rc_ie_verify(struct uwb_dev *uwb_dev, const void *start,
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const void *itr, const void *top)
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{
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struct device *dev = &uwb_dev->dev;
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const struct uwb_ie_hdr *ie_hdr;
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if (top - itr < sizeof(*ie_hdr)) {
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dev_err(dev, "Bad IE: no data to decode header "
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"(%zu bytes left vs %zu needed) at offset %zu\n",
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top - itr, sizeof(*ie_hdr), itr - start);
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return -EINVAL;
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}
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ie_hdr = itr;
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itr += sizeof(*ie_hdr);
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if (top - itr < ie_hdr->length) {
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dev_err(dev, "Bad IE: not enough data for payload "
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"(%zu bytes left vs %zu needed) at offset %zu\n",
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top - itr, (size_t)ie_hdr->length,
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(void *)ie_hdr - start);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* Walk a buffer filled with consecutive IE's a buffer
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*
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* @uwb_dev: UWB device this IEs belong to (for err messages mainly)
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*
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* @fn: function to call with each IE; if it returns 0, we keep
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* traversing the buffer. If it returns !0, we'll stop and return
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* that value.
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*
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* @data: pointer passed to @fn
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*
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* @buf: buffer where the consecutive IEs are located
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*
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* @size: size of @buf
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*
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* Each IE is checked for basic correctness (there is space left for
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* the header and the payload). If that test is failed, we stop
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* processing. For every good IE, @fn is called.
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*/
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ssize_t uwb_ie_for_each(struct uwb_dev *uwb_dev, uwb_ie_f fn, void *data,
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const void *buf, size_t size)
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{
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ssize_t result = 0;
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const struct uwb_ie_hdr *ie_hdr;
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const void *itr = buf, *top = itr + size;
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while (itr < top) {
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if (uwb_rc_ie_verify(uwb_dev, buf, itr, top) != 0)
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break;
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ie_hdr = itr;
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itr += sizeof(*ie_hdr) + ie_hdr->length;
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result = fn(uwb_dev, ie_hdr, itr - buf, data);
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if (result != 0)
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break;
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}
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return result;
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}
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EXPORT_SYMBOL_GPL(uwb_ie_for_each);
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/**
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* Replace all IEs currently being transmitted by a device
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*
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* @cmd: pointer to the SET-IE command with the IEs to set
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* @size: size of @buf
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*/
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int uwb_rc_set_ie(struct uwb_rc *rc, struct uwb_rc_cmd_set_ie *cmd)
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{
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int result;
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struct device *dev = &rc->uwb_dev.dev;
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struct uwb_rc_evt_set_ie reply;
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reply.rceb.bEventType = UWB_RC_CET_GENERAL;
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reply.rceb.wEvent = UWB_RC_CMD_SET_IE;
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result = uwb_rc_cmd(rc, "SET-IE", &cmd->rccb,
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sizeof(*cmd) + le16_to_cpu(cmd->wIELength),
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&reply.rceb, sizeof(reply));
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if (result < 0)
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goto error_cmd;
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else if (result != sizeof(reply)) {
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dev_err(dev, "SET-IE: not enough data to decode reply "
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"(%d bytes received vs %zu needed)\n",
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result, sizeof(reply));
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result = -EIO;
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} else if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
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dev_err(dev, "SET-IE: command execution failed: %s (%d)\n",
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uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
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result = -EIO;
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} else
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result = 0;
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error_cmd:
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return result;
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}
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/**
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* Determine by IE id if IE is host settable
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* WUSB 1.0 [8.6.2.8 Table 8.85]
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*
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* EXCEPTION:
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* All but UWB_IE_WLP appears in Table 8.85 from WUSB 1.0. Setting this IE
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* is required for the WLP substack to perform association with its WSS so
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* we hope that the WUSB spec will be changed to reflect this.
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*/
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static
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int uwb_rc_ie_is_host_settable(enum uwb_ie element_id)
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{
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if (element_id == UWB_PCA_AVAILABILITY ||
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element_id == UWB_BP_SWITCH_IE ||
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element_id == UWB_MAC_CAPABILITIES_IE ||
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element_id == UWB_PHY_CAPABILITIES_IE ||
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element_id == UWB_APP_SPEC_PROBE_IE ||
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element_id == UWB_IDENTIFICATION_IE ||
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element_id == UWB_MASTER_KEY_ID_IE ||
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element_id == UWB_IE_WLP ||
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element_id == UWB_APP_SPEC_IE)
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return 1;
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return 0;
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}
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/**
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* Extract Host Settable IEs from IE
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*
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* @ie_data: pointer to buffer containing all IEs
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* @size: size of buffer
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*
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* @returns: length of buffer that only includes host settable IEs
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*
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* Given a buffer of IEs we move all Host Settable IEs to front of buffer
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* by overwriting the IEs that are not Host Settable.
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* Buffer length is adjusted accordingly.
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*/
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static
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ssize_t uwb_rc_parse_host_settable_ie(struct uwb_dev *uwb_dev,
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void *ie_data, size_t size)
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{
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size_t new_len = size;
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struct uwb_ie_hdr *ie_hdr;
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size_t ie_length;
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void *itr = ie_data, *top = itr + size;
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while (itr < top) {
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if (uwb_rc_ie_verify(uwb_dev, ie_data, itr, top) != 0)
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break;
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ie_hdr = itr;
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ie_length = sizeof(*ie_hdr) + ie_hdr->length;
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if (uwb_rc_ie_is_host_settable(ie_hdr->element_id)) {
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itr += ie_length;
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} else {
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memmove(itr, itr + ie_length, top - (itr + ie_length));
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new_len -= ie_length;
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top -= ie_length;
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}
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}
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return new_len;
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}
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/* Cleanup the whole IE management subsystem */
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void uwb_rc_ie_init(struct uwb_rc *uwb_rc)
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{
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mutex_init(&uwb_rc->ies_mutex);
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}
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/**
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* Set up cache for host settable IEs currently being transmitted
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*
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* First we just call GET-IE to get the current IEs being transmitted
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* (or we workaround and pretend we did) and (because the format is
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* the same) reuse that as the IE cache (with the command prefix, as
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* explained in 'struct uwb_rc').
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*
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* @returns: size of cache created
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*/
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ssize_t uwb_rc_ie_setup(struct uwb_rc *uwb_rc)
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{
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struct device *dev = &uwb_rc->uwb_dev.dev;
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ssize_t result;
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size_t capacity;
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struct uwb_rc_evt_get_ie *ie_info;
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d_fnstart(3, dev, "(%p)\n", uwb_rc);
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mutex_lock(&uwb_rc->ies_mutex);
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result = uwb_rc_get_ie(uwb_rc, &ie_info);
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if (result < 0)
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goto error_get_ie;
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capacity = result;
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d_printf(5, dev, "Got IEs %zu bytes (%zu long at %p)\n", result,
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(size_t)le16_to_cpu(ie_info->wIELength), ie_info);
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/* Remove IEs that host should not set. */
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result = uwb_rc_parse_host_settable_ie(&uwb_rc->uwb_dev,
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ie_info->IEData, le16_to_cpu(ie_info->wIELength));
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if (result < 0)
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goto error_parse;
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d_printf(5, dev, "purged non-settable IEs to %zu bytes\n", result);
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uwb_rc->ies = (void *) ie_info;
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uwb_rc->ies->rccb.bCommandType = UWB_RC_CET_GENERAL;
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uwb_rc->ies->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_IE);
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uwb_rc->ies_capacity = capacity;
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d_printf(5, dev, "IE cache at %p %zu bytes, %zu capacity\n",
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ie_info, result, capacity);
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result = 0;
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error_parse:
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error_get_ie:
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mutex_unlock(&uwb_rc->ies_mutex);
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d_fnend(3, dev, "(%p) = %zu\n", uwb_rc, result);
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return result;
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}
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/* Cleanup the whole IE management subsystem */
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void uwb_rc_ie_release(struct uwb_rc *uwb_rc)
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{
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kfree(uwb_rc->ies);
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uwb_rc->ies = NULL;
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uwb_rc->ies_capacity = 0;
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}
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static
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int __acc_size(struct uwb_dev *uwb_dev, const struct uwb_ie_hdr *ie_hdr,
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size_t offset, void *_ctx)
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{
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size_t *acc_size = _ctx;
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*acc_size += sizeof(*ie_hdr) + ie_hdr->length;
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d_printf(6, &uwb_dev->dev, "new acc size %zu\n", *acc_size);
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return 0;
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}
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/**
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* Add a new IE to IEs currently being transmitted by device
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*
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* @ies: the buffer containing the new IE or IEs to be added to
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* the device's beacon. The buffer will be verified for
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* consistence (meaning the headers should be right) and
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* consistent with the buffer size.
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* @size: size of @ies (in bytes, total buffer size)
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* @returns: 0 if ok, <0 errno code on error
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*
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* According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
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* after the device sent the first beacon that includes the IEs specified
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* in the SET IE command. We thus cannot send this command if the device is
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* not beaconing. Instead, a SET IE command will be sent later right after
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* we start beaconing.
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*
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* Setting an IE on the device will overwrite all current IEs in device. So
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* we take the current IEs being transmitted by the device, append the
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* new one, and call SET IE with all the IEs needed.
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*
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* The local IE cache will only be updated with the new IE if SET IE
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* completed successfully.
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*/
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int uwb_rc_ie_add(struct uwb_rc *uwb_rc,
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const struct uwb_ie_hdr *ies, size_t size)
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{
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int result = 0;
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struct device *dev = &uwb_rc->uwb_dev.dev;
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struct uwb_rc_cmd_set_ie *new_ies;
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size_t ies_size, total_size, acc_size = 0;
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if (uwb_rc->ies == NULL)
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return -ESHUTDOWN;
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uwb_ie_for_each(&uwb_rc->uwb_dev, __acc_size, &acc_size, ies, size);
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if (acc_size != size) {
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dev_err(dev, "BUG: bad IEs, misconstructed headers "
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"[%zu bytes reported vs %zu calculated]\n",
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size, acc_size);
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WARN_ON(1);
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return -EINVAL;
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}
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mutex_lock(&uwb_rc->ies_mutex);
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ies_size = le16_to_cpu(uwb_rc->ies->wIELength);
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total_size = sizeof(*uwb_rc->ies) + ies_size;
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if (total_size + size > uwb_rc->ies_capacity) {
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d_printf(4, dev, "Reallocating IE cache from %p capacity %zu "
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"to capacity %zu\n", uwb_rc->ies, uwb_rc->ies_capacity,
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total_size + size);
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new_ies = kzalloc(total_size + size, GFP_KERNEL);
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if (new_ies == NULL) {
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dev_err(dev, "No memory for adding new IE\n");
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result = -ENOMEM;
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goto error_alloc;
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}
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memcpy(new_ies, uwb_rc->ies, total_size);
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uwb_rc->ies_capacity = total_size + size;
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kfree(uwb_rc->ies);
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uwb_rc->ies = new_ies;
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d_printf(4, dev, "New IE cache at %p capacity %zu\n",
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uwb_rc->ies, uwb_rc->ies_capacity);
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}
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memcpy((void *)uwb_rc->ies + total_size, ies, size);
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uwb_rc->ies->wIELength = cpu_to_le16(ies_size + size);
|
|
if (uwb_rc->beaconing != -1) {
|
|
result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
|
|
if (result < 0) {
|
|
dev_err(dev, "Cannot set new IE on device: %d\n",
|
|
result);
|
|
uwb_rc->ies->wIELength = cpu_to_le16(ies_size);
|
|
} else
|
|
result = 0;
|
|
}
|
|
d_printf(4, dev, "IEs now occupy %hu bytes of %zu capacity at %p\n",
|
|
le16_to_cpu(uwb_rc->ies->wIELength), uwb_rc->ies_capacity,
|
|
uwb_rc->ies);
|
|
error_alloc:
|
|
mutex_unlock(&uwb_rc->ies_mutex);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_rc_ie_add);
|
|
|
|
|
|
/*
|
|
* Remove an IE from internal cache
|
|
*
|
|
* We are dealing with our internal IE cache so no need to verify that the
|
|
* IEs are valid (it has been done already).
|
|
*
|
|
* Should be called with ies_mutex held
|
|
*
|
|
* We do not break out once an IE is found in the cache. It is currently
|
|
* possible to have more than one IE with the same ID included in the
|
|
* beacon. We don't reallocate, we just mark the size smaller.
|
|
*/
|
|
static
|
|
int uwb_rc_ie_cache_rm(struct uwb_rc *uwb_rc, enum uwb_ie to_remove)
|
|
{
|
|
struct uwb_ie_hdr *ie_hdr;
|
|
size_t new_len = le16_to_cpu(uwb_rc->ies->wIELength);
|
|
void *itr = uwb_rc->ies->IEData;
|
|
void *top = itr + new_len;
|
|
|
|
while (itr < top) {
|
|
ie_hdr = itr;
|
|
if (ie_hdr->element_id != to_remove) {
|
|
itr += sizeof(*ie_hdr) + ie_hdr->length;
|
|
} else {
|
|
int ie_length;
|
|
ie_length = sizeof(*ie_hdr) + ie_hdr->length;
|
|
if (top - itr != ie_length)
|
|
memmove(itr, itr + ie_length, top - itr + ie_length);
|
|
top -= ie_length;
|
|
new_len -= ie_length;
|
|
}
|
|
}
|
|
uwb_rc->ies->wIELength = cpu_to_le16(new_len);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Remove an IE currently being transmitted by device
|
|
*
|
|
* @element_id: id of IE to be removed from device's beacon
|
|
*/
|
|
int uwb_rc_ie_rm(struct uwb_rc *uwb_rc, enum uwb_ie element_id)
|
|
{
|
|
struct device *dev = &uwb_rc->uwb_dev.dev;
|
|
int result;
|
|
|
|
if (uwb_rc->ies == NULL)
|
|
return -ESHUTDOWN;
|
|
mutex_lock(&uwb_rc->ies_mutex);
|
|
result = uwb_rc_ie_cache_rm(uwb_rc, element_id);
|
|
if (result < 0)
|
|
dev_err(dev, "Cannot remove IE from cache.\n");
|
|
if (uwb_rc->beaconing != -1) {
|
|
result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
|
|
if (result < 0)
|
|
dev_err(dev, "Cannot set new IE on device.\n");
|
|
}
|
|
mutex_unlock(&uwb_rc->ies_mutex);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_rc_ie_rm);
|