drivers/net/wireless/silabs/wfx/key.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/silabs/wfx/key.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/silabs/wfx/key.c
Extension
.c
Size
7619 bytes
Lines
228
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Key management related functions.
 *
 * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
 * Copyright (c) 2010, ST-Ericsson
 */
#include <linux/etherdevice.h>
#include <net/mac80211.h>

#include "key.h"
#include "wfx.h"
#include "hif_tx_mib.h"

static int wfx_alloc_key(struct wfx_dev *wdev)
{
	int idx;

	idx = ffs(~wdev->key_map) - 1;
	if (idx < 0 || idx >= MAX_KEY_ENTRIES)
		return -1;

	wdev->key_map |= BIT(idx);
	return idx;
}

static void wfx_free_key(struct wfx_dev *wdev, int idx)
{
	WARN(!(wdev->key_map & BIT(idx)), "inconsistent key allocation");
	wdev->key_map &= ~BIT(idx);
}

static u8 fill_wep_pair(struct wfx_hif_wep_pairwise_key *msg,
			struct ieee80211_key_conf *key, u8 *peer_addr)
{
	WARN(key->keylen > sizeof(msg->key_data), "inconsistent data");
	msg->key_length = key->keylen;
	memcpy(msg->key_data, key->key, key->keylen);
	ether_addr_copy(msg->peer_address, peer_addr);
	return HIF_KEY_TYPE_WEP_PAIRWISE;
}

static u8 fill_wep_group(struct wfx_hif_wep_group_key *msg,
			 struct ieee80211_key_conf *key)
{
	WARN(key->keylen > sizeof(msg->key_data), "inconsistent data");
	msg->key_id = key->keyidx;
	msg->key_length = key->keylen;
	memcpy(msg->key_data, key->key, key->keylen);
	return HIF_KEY_TYPE_WEP_DEFAULT;
}

static u8 fill_tkip_pair(struct wfx_hif_tkip_pairwise_key *msg,
			 struct ieee80211_key_conf *key, u8 *peer_addr)
{
	u8 *keybuf = key->key;

	WARN(key->keylen != sizeof(msg->tkip_key_data) + sizeof(msg->tx_mic_key) +
			    sizeof(msg->rx_mic_key), "inconsistent data");
	memcpy(msg->tkip_key_data, keybuf, sizeof(msg->tkip_key_data));
	keybuf += sizeof(msg->tkip_key_data);
	memcpy(msg->tx_mic_key, keybuf, sizeof(msg->tx_mic_key));
	keybuf += sizeof(msg->tx_mic_key);
	memcpy(msg->rx_mic_key, keybuf, sizeof(msg->rx_mic_key));
	ether_addr_copy(msg->peer_address, peer_addr);
	return HIF_KEY_TYPE_TKIP_PAIRWISE;
}

static u8 fill_tkip_group(struct wfx_hif_tkip_group_key *msg, struct ieee80211_key_conf *key,
			  struct ieee80211_key_seq *seq, enum nl80211_iftype iftype)
{
	u8 *keybuf = key->key;

	WARN(key->keylen != sizeof(msg->tkip_key_data) + 2 * sizeof(msg->rx_mic_key),
	     "inconsistent data");
	msg->key_id = key->keyidx;
	memcpy(msg->rx_sequence_counter, &seq->tkip.iv16, sizeof(seq->tkip.iv16));
	memcpy(msg->rx_sequence_counter + sizeof(u16), &seq->tkip.iv32, sizeof(seq->tkip.iv32));
	memcpy(msg->tkip_key_data, keybuf, sizeof(msg->tkip_key_data));
	keybuf += sizeof(msg->tkip_key_data);
	if (iftype == NL80211_IFTYPE_AP)
		/* Use Tx MIC Key */
		memcpy(msg->rx_mic_key, keybuf + 0, sizeof(msg->rx_mic_key));
	else
		/* Use Rx MIC Key */
		memcpy(msg->rx_mic_key, keybuf + 8, sizeof(msg->rx_mic_key));
	return HIF_KEY_TYPE_TKIP_GROUP;
}

static u8 fill_ccmp_pair(struct wfx_hif_aes_pairwise_key *msg,

Annotation

Implementation Notes