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linux/net/mac80211/debugfs_key.c
Johannes Berg bfd8403add wifi: mac80211: reorg some iface data structs for MLD 
Start reorganizing interface related data structures toward
MLD. The most complex part here is for the keys, since we
have to split the various kinds of GTKs off to the link but
still need to use (for WEP) the other keys as a fallback
even for multicast frames.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2022-06-20 12:55:06 +02:00

473 lines
12 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2003-2005 Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
* Copyright (C) 2015 Intel Deutschland GmbH
* Copyright (C) 2021-2022 Intel Corporation
*/
#include <linux/kobject.h>
#include <linux/slab.h>
#include "ieee80211_i.h"
#include "key.h"
#include "debugfs.h"
#include "debugfs_key.h"
#define KEY_READ(name, prop, format_string) \
static ssize_t key_##name##_read(struct file *file, \
char __user *userbuf, \
size_t count, loff_t *ppos) \
{ \
struct ieee80211_key *key = file->private_data; \
return mac80211_format_buffer(userbuf, count, ppos, \
format_string, key->prop); \
}
#define KEY_READ_X(name) KEY_READ(name, name, "0x%x\n")
#define KEY_OPS(name) \
static const struct file_operations key_ ##name## _ops = { \
.read = key_##name##_read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
}
#define KEY_OPS_W(name) \
static const struct file_operations key_ ##name## _ops = { \
.read = key_##name##_read, \
.write = key_##name##_write, \
.open = simple_open, \
.llseek = generic_file_llseek, \
}
#define KEY_FILE(name, format) \
KEY_READ_##format(name) \
KEY_OPS(name)
#define KEY_CONF_READ(name, format_string) \
KEY_READ(conf_##name, conf.name, format_string)
#define KEY_CONF_READ_D(name) KEY_CONF_READ(name, "%d\n")
#define KEY_CONF_OPS(name) \
static const struct file_operations key_ ##name## _ops = { \
.read = key_conf_##name##_read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
}
#define KEY_CONF_FILE(name, format) \
KEY_CONF_READ_##format(name) \
KEY_CONF_OPS(name)
KEY_CONF_FILE(keylen, D);
KEY_CONF_FILE(keyidx, D);
KEY_CONF_FILE(hw_key_idx, D);
KEY_FILE(flags, X);
KEY_READ(ifindex, sdata->name, "%s\n");
KEY_OPS(ifindex);
static ssize_t key_algorithm_read(struct file *file,
char __user *userbuf,
size_t count, loff_t *ppos)
{
char buf[15];
struct ieee80211_key *key = file->private_data;
u32 c = key->conf.cipher;
sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
}
KEY_OPS(algorithm);
static ssize_t key_tx_spec_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
u64 pn;
int ret;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
return -EINVAL;
case WLAN_CIPHER_SUITE_TKIP:
/* not supported yet */
return -EOPNOTSUPP;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
ret = kstrtou64_from_user(userbuf, count, 16, &pn);
if (ret)
return ret;
/* PN is a 48-bit counter */
if (pn >= (1ULL << 48))
return -ERANGE;
atomic64_set(&key->conf.tx_pn, pn);
return count;
default:
return 0;
}
}
static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
u64 pn;
char buf[20];
int len;
struct ieee80211_key *key = file->private_data;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
len = scnprintf(buf, sizeof(buf), "\n");
break;
case WLAN_CIPHER_SUITE_TKIP:
pn = atomic64_read(&key->conf.tx_pn);
len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
TKIP_PN_TO_IV32(pn),
TKIP_PN_TO_IV16(pn));
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
pn = atomic64_read(&key->conf.tx_pn);
len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS_W(tx_spec);
static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
int i, len;
const u8 *rpn;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
len = scnprintf(buf, sizeof(buf), "\n");
break;
case WLAN_CIPHER_SUITE_TKIP:
for (i = 0; i < IEEE80211_NUM_TIDS; i++)
p += scnprintf(p, sizeof(buf)+buf-p,
"%08x %04x\n",
key->u.tkip.rx[i].iv32,
key->u.tkip.rx[i].iv16);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
rpn = key->u.ccmp.rx_pn[i];
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
}
len = p - buf;
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
rpn = key->u.aes_cmac.rx_pn;
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
rpn = key->u.aes_gmac.rx_pn;
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
rpn = key->u.gcmp.rx_pn[i];
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
}
len = p - buf;
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(rx_spec);
static ssize_t key_replays_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[20];
int len;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_cmac.replays);
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_gmac.replays);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(replays);
static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[20];
int len;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_cmac.icverrors);
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_gmac.icverrors);
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(icverrors);
static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[20];
int len;
if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
return -EINVAL;
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(mic_failures);
static ssize_t key_key_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
int i, bufsize = 2 * key->conf.keylen + 2;
char *buf = kmalloc(bufsize, GFP_KERNEL);
char *p = buf;
ssize_t res;
if (!buf)
return -ENOMEM;
for (i = 0; i < key->conf.keylen; i++)
p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
p += scnprintf(p, bufsize+buf-p, "\n");
res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
kfree(buf);
return res;
}
KEY_OPS(key);
#define DEBUGFS_ADD(name) \
debugfs_create_file(#name, 0400, key->debugfs.dir, \
key, &key_##name##_ops)
#define DEBUGFS_ADD_W(name) \
debugfs_create_file(#name, 0600, key->debugfs.dir, \
key, &key_##name##_ops);
void ieee80211_debugfs_key_add(struct ieee80211_key *key)
{
static int keycount;
char buf[100];
struct sta_info *sta;
if (!key->local->debugfs.keys)
return;
sprintf(buf, "%d", keycount);
key->debugfs.cnt = keycount;
keycount++;
key->debugfs.dir = debugfs_create_dir(buf,
key->local->debugfs.keys);
sta = key->sta;
if (sta) {
sprintf(buf, "../../netdev:%s/stations/%pM",
sta->sdata->name, sta->sta.addr);
key->debugfs.stalink =
debugfs_create_symlink("station", key->debugfs.dir, buf);
}
DEBUGFS_ADD(keylen);
DEBUGFS_ADD(flags);
DEBUGFS_ADD(keyidx);
DEBUGFS_ADD(hw_key_idx);
DEBUGFS_ADD(algorithm);
DEBUGFS_ADD_W(tx_spec);
DEBUGFS_ADD(rx_spec);
DEBUGFS_ADD(replays);
DEBUGFS_ADD(icverrors);
DEBUGFS_ADD(mic_failures);
DEBUGFS_ADD(key);
DEBUGFS_ADD(ifindex);
};
void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
{
if (!key)
return;
debugfs_remove_recursive(key->debugfs.dir);
key->debugfs.dir = NULL;
}
void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
struct ieee80211_key *key;
if (!sdata->vif.debugfs_dir)
return;
lockdep_assert_held(&sdata->local->key_mtx);
debugfs_remove(sdata->debugfs.default_unicast_key);
sdata->debugfs.default_unicast_key = NULL;
if (sdata->default_unicast_key) {
key = key_mtx_dereference(sdata->local,
sdata->default_unicast_key);
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_unicast_key =
debugfs_create_symlink("default_unicast_key",
sdata->vif.debugfs_dir, buf);
}
debugfs_remove(sdata->debugfs.default_multicast_key);
sdata->debugfs.default_multicast_key = NULL;
if (sdata->deflink.default_multicast_key) {
key = key_mtx_dereference(sdata->local,
sdata->deflink.default_multicast_key);
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_multicast_key =
debugfs_create_symlink("default_multicast_key",
sdata->vif.debugfs_dir, buf);
}
}
void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
struct ieee80211_key *key;
if (!sdata->vif.debugfs_dir)
return;
key = key_mtx_dereference(sdata->local,
sdata->deflink.default_mgmt_key);
if (key) {
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_mgmt_key =
debugfs_create_symlink("default_mgmt_key",
sdata->vif.debugfs_dir, buf);
} else
ieee80211_debugfs_key_remove_mgmt_default(sdata);
}
void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
{
if (!sdata)
return;
debugfs_remove(sdata->debugfs.default_mgmt_key);
sdata->debugfs.default_mgmt_key = NULL;
}
void
ieee80211_debugfs_key_add_beacon_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
struct ieee80211_key *key;
if (!sdata->vif.debugfs_dir)
return;
key = key_mtx_dereference(sdata->local,
sdata->deflink.default_beacon_key);
if (key) {
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_beacon_key =
debugfs_create_symlink("default_beacon_key",
sdata->vif.debugfs_dir, buf);
} else {
ieee80211_debugfs_key_remove_beacon_default(sdata);
}
}
void
ieee80211_debugfs_key_remove_beacon_default(struct ieee80211_sub_if_data *sdata)
{
if (!sdata)
return;
debugfs_remove(sdata->debugfs.default_beacon_key);
sdata->debugfs.default_beacon_key = NULL;
}
void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
struct sta_info *sta)
{
debugfs_remove(key->debugfs.stalink);
key->debugfs.stalink = NULL;
}
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