/*
* Validate and strip privacy headers (and trailer) for a
* received frame that has the WEP/Privacy bit set.
*/
struct ieee80211_key *
ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen)
{
#define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN)
#define IEEE80211_WEP_MINLEN \
(sizeof(struct ieee80211_frame) + \
IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_key *k;
struct ieee80211_frame *wh;
const struct ieee80211_cipher *cip;
uint8_t keyid;
/* NB: this minimum size data frame could be bigger */
if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
"%s: WEP data frame too short, len %u\n",
__func__, m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++; /* XXX need unique stat? */
return NULL;
}
/*
* Locate the key. If unicast and there is no unicast
* key then we fall back to the key id in the header.
* This assumes unicast keys are only configured when
* the key id in the header is meaningless (typically 0).
*/
wh = mtod(m, struct ieee80211_frame *);
m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid);
if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey))
k = &vap->iv_nw_keys[keyid >> 6];
else
/*
* Add privacy headers appropriate for the specified key.
*/
struct ieee80211_key *
ieee80211_crypto_encap(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_key *k;
struct ieee80211_frame *wh;
const struct ieee80211_cipher *cip;
uint8_t keyid;
/*
* Multicast traffic always uses the multicast key.
* Otherwise if a unicast key is set we use that and
* it is always key index 0. When no unicast key is
* set we fall back to the default transmit key.
*/
wh = mtod(m, struct ieee80211_frame *);
if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
wh->i_addr1,
"no default transmit key (%s) deftxkey %u",
__func__, vap->iv_def_txkey);
vap->iv_stats.is_tx_nodefkey++;
return NULL;
}
keyid = vap->iv_def_txkey;
k = &vap->iv_nw_keys[vap->iv_def_txkey];
} else {
keyid = 0;
k = &ni->ni_ucastkey;
}
cip = k->wk_cipher;
return (cip->ic_encap(k, m, keyid<<6) ? k : NULL);
}
struct ieee80211_key *
ieee80211_crypto_get_txkey(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_frame *wh;
/*
* Multicast traffic always uses the multicast key.
* Otherwise if a unicast key is set we use that and
* it is always key index 0. When no unicast key is
* set we fall back to the default transmit key.
*/
wh = mtod(m, struct ieee80211_frame *);
if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
wh->i_addr1,
"no default transmit key (%s) deftxkey %u",
__func__, vap->iv_def_txkey);
vap->iv_stats.is_tx_nodefkey++;
return NULL;
}
return &vap->iv_nw_keys[vap->iv_def_txkey];
}
return &ni->ni_ucastkey;
}
/*
* Validate and strip privacy headers (and trailer) for a
* received frame that has the WEP/Privacy bit set.
*/
int
ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen,
struct ieee80211_key **key)
{
#define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN)
#define IEEE80211_WEP_MINLEN \
(sizeof(struct ieee80211_frame) + \
IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_key *k;
struct ieee80211_frame *wh;
const struct ieee80211_rx_stats *rxs;
const struct ieee80211_cipher *cip;
uint8_t keyid;
/*
* Check for hardware decryption and IV stripping.
* If the IV is stripped then we definitely can't find a key.
* Set the key to NULL but return true; upper layers
* will need to handle a NULL key for a successful
* decrypt.
*/
rxs = ieee80211_get_rx_params_ptr(m);
if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) {
if (rxs->c_pktflags & IEEE80211_RX_F_IV_STRIP) {
/*
* Hardware decrypted, IV stripped.
* We can't find a key with a stripped IV.
* Return successful.
*/
*key = NULL;
return (1);
}
}
/* NB: this minimum size data frame could be bigger */
if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
"%s: WEP data frame too short, len %u\n",
__func__, m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++; /* XXX need unique stat? */
*key = NULL;
return (0);
}
/*
* Locate the key. If unicast and there is no unicast
* key then we fall back to the key id in the header.
* This assumes unicast keys are only configured when
* the key id in the header is meaningless (typically 0).
*/
wh = mtod(m, struct ieee80211_frame *);
m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid);
if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey))
k = &vap->iv_nw_keys[keyid >> 6];
else
