aboutsummaryrefslogtreecommitdiffstats
path: root/net
diff options
context:
space:
mode:
authorEmmanuel Grumbach <emmanuel.grumbach@intel.com>2008-03-20 09:06:41 -0400
committerJohn W. Linville <linville@tuxdriver.com>2008-03-25 16:41:52 -0400
commit5d2cdcd4e85c5187db30a6b29f79fbbe59f39f78 (patch)
tree0c7e079a30871fb593c282a7a711ccc90c31af1a /net
parent17e476b8db13790c03e2c46d93abc71468fca47e (diff)
mac80211: get a TKIP phase key from skb
This patch makes mac80211 able to compute a TKIP key from an skb. The requested key can be a phase 1 or a phase 2 key. This is useful for drivers who need to provide tkip key to their HW to enable HW encryption. Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/tkip.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 3abe194e4d55..5c36b2df3faf 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -214,6 +214,59 @@ void ieee80211_tkip_gen_rc4key(struct ieee80211_key *key, u8 *ta,
214 key->u.tkip.iv16, rc4key); 214 key->u.tkip.iv16, rc4key);
215} 215}
216 216
217void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
218 struct sk_buff *skb, enum ieee80211_tkip_key_type type,
219 u8 *outkey)
220{
221 struct ieee80211_key *key = (struct ieee80211_key *)
222 container_of(keyconf, struct ieee80211_key, conf);
223 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
224 u8 *data = (u8 *) hdr;
225 u16 fc = le16_to_cpu(hdr->frame_control);
226 int hdr_len = ieee80211_get_hdrlen(fc);
227 u8 *ta = hdr->addr2;
228 u16 iv16;
229 u32 iv32;
230
231 iv16 = data[hdr_len] << 8;
232 iv16 += data[hdr_len + 2];
233 iv32 = data[hdr_len + 4] +
234 (data[hdr_len + 5] >> 8) +
235 (data[hdr_len + 6] >> 16) +
236 (data[hdr_len + 7] >> 24);
237
238#ifdef CONFIG_TKIP_DEBUG
239 printk(KERN_DEBUG "TKIP encrypt: iv16 = 0x%04x, iv32 = 0x%08x\n",
240 iv16, iv32);
241
242 if (iv32 != key->u.tkip.iv32) {
243 printk(KERN_DEBUG "skb: iv32 = 0x%08x key: iv32 = 0x%08x\n",
244 iv32, key->u.tkip.iv32);
245 printk(KERN_DEBUG "Wrap around of iv16 in the middle of a "
246 "fragmented packet\n");
247 }
248#endif /* CONFIG_TKIP_DEBUG */
249
250 /* Update the p1k only when the iv16 in the packet wraps around, this
251 * might occur after the wrap around of iv16 in the key in case of
252 * fragmented packets. */
253 if (iv16 == 0 || !key->u.tkip.tx_initialized) {
254 /* IV16 wrapped around - perform TKIP phase 1 */
255 tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
256 iv32, key->u.tkip.p1k);
257 key->u.tkip.tx_initialized = 1;
258 }
259
260 if (type == IEEE80211_TKIP_P1_KEY) {
261 memcpy(outkey, key->u.tkip.p1k, sizeof(u16) * 5);
262 return;
263 }
264
265 tkip_mixing_phase2(key->u.tkip.p1k,
266 &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY], iv16, outkey);
267}
268EXPORT_SYMBOL(ieee80211_get_tkip_key);
269
217/* Encrypt packet payload with TKIP using @key. @pos is a pointer to the 270/* Encrypt packet payload with TKIP using @key. @pos is a pointer to the
218 * beginning of the buffer containing payload. This payload must include 271 * beginning of the buffer containing payload. This payload must include
219 * headroom of eight octets for IV and Ext. IV and taildroom of four octets 272 * headroom of eight octets for IV and Ext. IV and taildroom of four octets