net80211: add new method for ieee80211_cipher (ic_setiv).

This can be used to update IV state for the caller without adding
information to the mbuf.  Some hardware (eg rum) apparently requires
bits of this.

Submitted by:	<s3erios@gmail.com>
Differential Revision:	https://reviews.freebsd.org/D3638

1 files changed, 31 insertions, 21 deletions

diff --git a/sys/net80211/ieee80211_crypto_wep.c b/sys/net80211/ieee80211_crypto_wep.c
index b99af5dd1ddc..dbcf765de608 100644
--- a/sys/net80211/ieee80211_crypto_wep.c
+++ b/sys/net80211/ieee80211_crypto_wep.c
@@ -50,8 +50,9 @@ __FBSDID("$FreeBSD$");
 static	void *wep_attach(struct ieee80211vap *, struct ieee80211_key *);
 static	void wep_detach(struct ieee80211_key *);
 static	int wep_setkey(struct ieee80211_key *);
+static	void wep_setiv(struct ieee80211_key *, uint8_t *);
 static	int wep_encap(struct ieee80211_key *, struct mbuf *);
-static	int wep_decap(struct ieee80211_key *, struct mbuf *, int hdrlen);
+static	int wep_decap(struct ieee80211_key *, struct mbuf *, int);
 static	int wep_enmic(struct ieee80211_key *, struct mbuf *, int);
 static	int wep_demic(struct ieee80211_key *, struct mbuf *, int);
 
@@ -64,6 +65,7 @@ static const struct ieee80211_cipher wep = {
 	.ic_attach	= wep_attach,
 	.ic_detach	= wep_detach,
 	.ic_setkey	= wep_setkey,
+	.ic_setiv	= wep_setiv,
 	.ic_encap	= wep_encap,
 	.ic_decap	= wep_decap,
 	.ic_enmic	= wep_enmic,
@@ -117,31 +119,13 @@ wep_setkey(struct ieee80211_key *k)
 	return k->wk_keylen >= 40/NBBY;
 }
 
-/*
- * Add privacy headers appropriate for the specified key.
- */
-static int
-wep_encap(struct ieee80211_key *k, struct mbuf *m)
+static void
+wep_setiv(struct ieee80211_key *k, uint8_t *ivp)
 {
 	struct wep_ctx *ctx = k->wk_private;
 	struct ieee80211vap *vap = ctx->wc_vap;
-	struct ieee80211com *ic = ctx->wc_ic;
 	uint32_t iv;
-	uint8_t *ivp;
 	uint8_t keyid;
-	int hdrlen;
-
-	hdrlen = ieee80211_hdrspace(ic, mtod(m, void *));
-
-	/*
-	 * Copy down 802.11 header and add the IV + KeyID.
-	 */
-	M_PREPEND(m, wep.ic_header, M_NOWAIT);
-	if (m == NULL)
-		return 0;
-	ivp = mtod(m, uint8_t *);
-	ovbcopy(ivp + wep.ic_header, ivp, hdrlen);
-	ivp += hdrlen;
 
 	keyid = ieee80211_crypto_get_keyid(vap, k) << 6;
 
@@ -186,6 +170,32 @@ wep_encap(struct ieee80211_key *k, struct mbuf *m)
 	ivp[0] = iv >> 16;
 #endif
 	ivp[3] = keyid;
+}
+
+/*
+ * Add privacy headers appropriate for the specified key.
+ */
+static int
+wep_encap(struct ieee80211_key *k, struct mbuf *m)
+{
+	struct wep_ctx *ctx = k->wk_private;
+	struct ieee80211com *ic = ctx->wc_ic;
+	uint8_t *ivp;
+	int hdrlen;
+
+	hdrlen = ieee80211_hdrspace(ic, mtod(m, void *));
+
+	/*
+	 * Copy down 802.11 header and add the IV + KeyID.
+	 */
+	M_PREPEND(m, wep.ic_header, M_NOWAIT);
+	if (m == NULL)
+		return 0;
+	ivp = mtod(m, uint8_t *);
+	ovbcopy(ivp + wep.ic_header, ivp, hdrlen);
+	ivp += hdrlen;
+
+	wep_setiv(k, ivp);
 
 	/*
 	 * Finally, do software encrypt if needed.