driver_bsd.c: Clean up EAPOL frame transmission code

The bsd_send_eapol() prepares 3000 bytes buffer for every EAPOL
frame transmission. I think malloc() is better way for efficient
memory use.

src/drivers/driver_bsd.c

@@ -696,39 +696,35 @@ bsd_send_eapol(void *priv, const u8 *addr, const u8 *data, size_t data_len,
 	       int encrypt, const u8 *own_addr)
 {
 	struct bsd_driver_data *drv = priv;
-	unsigned char buf[3000];
-	unsigned char *bp = buf;
+	unsigned char *bp;
 	struct l2_ethhdr *eth;
 	size_t len;
 	int status;
 
 	/*
-	 * Prepend the Etherent header.  If the caller left us
+	 * Prepend the Ethernet header.  If the caller left us
 	 * space at the front we could just insert it but since
 	 * we don't know we copy to a local buffer.  Given the frequency
 	 * and size of frames this probably doesn't matter.
 	 */
 	len = data_len + sizeof(struct l2_ethhdr);
-	if (len > sizeof(buf)) {
-		bp = malloc(len);
-		if (bp == NULL) {
-			printf("EAPOL frame discarded, cannot malloc temp "
-			       "buffer of size %u!\n", (unsigned int) len);
-			return -1;
-		}
+	bp = os_zalloc(len);
+	if (bp == NULL) {
+		wpa_printf(MSG_ERROR, "malloc() failed for bsd_send_eapol"
+			   "(len=%lu)", (unsigned long) len);
+		return -1;
 	}
 	eth = (struct l2_ethhdr *) bp;
-	memcpy(eth->h_dest, addr, ETH_ALEN);
-	memcpy(eth->h_source, own_addr, ETH_ALEN);
+	os_memcpy(eth->h_dest, addr, ETH_ALEN);
+	os_memcpy(eth->h_source, own_addr, ETH_ALEN);
 	eth->h_proto = htons(ETH_P_EAPOL);
-	memcpy(eth+1, data, data_len);
+	os_memcpy(eth + 1, data, data_len);
 
 	wpa_hexdump(MSG_MSGDUMP, "TX EAPOL", bp, len);
 
 	status = l2_packet_send(drv->sock_xmit, addr, ETH_P_EAPOL, bp, len);
 
-	if (bp != buf)
-		free(bp);
+	os_free(bp);
 	return status;
 }