wl12xx: add auto-arp support

The auto-arp feature of wl12xx allows the firmware to automatically
response to arp requests asking for its ip.

in order to use it, we configure the arp response template and
enable the corresponding bit in wl1271_acx_arp_filter (along with
passing its ip)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/cmd.c b/drivers/net/wireless/wl12xx/cmd.c
index 8e438e27e496..0106628aa5a2 100644
--- a/drivers/net/wireless/wl12xx/cmd.c
+++ b/drivers/net/wireless/wl12xx/cmd.c
@@ -639,6 +639,47 @@ out:
         return skb;
 }
 
+int wl1271_cmd_build_arp_rsp(struct wl1271 *wl, __be32 ip_addr)
+{
+        int ret;
+        struct wl12xx_arp_rsp_template tmpl;
+        struct ieee80211_hdr_3addr *hdr;
+        struct arphdr *arp_hdr;
+
+        memset(&tmpl, 0, sizeof(tmpl));
+
+        /* mac80211 header */
+        hdr = &tmpl.hdr;
+        hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
+                                         IEEE80211_STYPE_DATA |
+                                         IEEE80211_FCTL_TODS);
+        memcpy(hdr->addr1, wl->vif->bss_conf.bssid, ETH_ALEN);
+        memcpy(hdr->addr2, wl->vif->addr, ETH_ALEN);
+        memset(hdr->addr3, 0xff, ETH_ALEN);
+
+        /* llc layer */
+        memcpy(tmpl.llc_hdr, rfc1042_header, sizeof(rfc1042_header));
+        tmpl.llc_type = htons(ETH_P_ARP);
+
+        /* arp header */
+        arp_hdr = &tmpl.arp_hdr;
+        arp_hdr->ar_hrd = htons(ARPHRD_ETHER);
+        arp_hdr->ar_pro = htons(ETH_P_IP);
+        arp_hdr->ar_hln = ETH_ALEN;
+        arp_hdr->ar_pln = 4;
+        arp_hdr->ar_op = htons(ARPOP_REPLY);
+
+        /* arp payload */
+        memcpy(tmpl.sender_hw, wl->vif->addr, ETH_ALEN);
+        tmpl.sender_ip = ip_addr;
+
+        ret = wl1271_cmd_template_set(wl, CMD_TEMPL_ARP_RSP,
+                                      &tmpl, sizeof(tmpl), 0,
+                                      wl->basic_rate);
+
+        return ret;
+}
+
 int wl1271_build_qos_null_data(struct wl1271 *wl)
 {
         struct ieee80211_qos_hdr template;