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authorAvinash Patil <patila@marvell.com>2013-08-24 01:48:23 +0200
committerJohn W. Linville <linville@tuxdriver.com>2013-08-26 20:09:05 +0200
commit587b36d3642bdc921f4d624a740b6d91f779324b (patch)
tree980dd5d24e7048ab51d121971459b59d9a461984 /drivers/net/wireless/mwifiex/sta_rx.c
parentmwifiex: fix ext_capab IE structure definition (diff)
downloadlinux-587b36d3642bdc921f4d624a740b6d91f779324b.tar.xz
linux-587b36d3642bdc921f4d624a740b6d91f779324b.zip
mwifiex: drop gratuitous ARP frames
This patch adds support for dropping gratuitous ARP frames which is requirement for WFA Hotspot2.0. Hotspot2.0 capability is enabled in driver if extended capabilities IE from BSS descriptor has 11u interworking enabled. Signed-off-by: Avinash Patil <patila@marvell.com> Signed-off-by: Bing Zhao <bzhao@marvell.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/mwifiex/sta_rx.c')
-rw-r--r--drivers/net/wireless/mwifiex/sta_rx.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/net/wireless/mwifiex/sta_rx.c b/drivers/net/wireless/mwifiex/sta_rx.c
index b5c109504393..bb22664923ef 100644
--- a/drivers/net/wireless/mwifiex/sta_rx.c
+++ b/drivers/net/wireless/mwifiex/sta_rx.c
@@ -17,6 +17,8 @@
* this warranty disclaimer.
*/
+#include <uapi/linux/ipv6.h>
+#include <net/ndisc.h>
#include "decl.h"
#include "ioctl.h"
#include "util.h"
@@ -25,6 +27,46 @@
#include "11n_aggr.h"
#include "11n_rxreorder.h"
+/* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
+ * frame. If frame has both source and destination mac address as same, this
+ * function drops such gratuitous frames.
+ */
+static bool
+mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,
+ struct sk_buff *skb)
+{
+ const struct mwifiex_arp_eth_header *arp;
+ struct ethhdr *eth_hdr;
+ struct ipv6hdr *ipv6;
+ struct icmp6hdr *icmpv6;
+
+ eth_hdr = (struct ethhdr *)skb->data;
+ switch (ntohs(eth_hdr->h_proto)) {
+ case ETH_P_ARP:
+ arp = (void *)(skb->data + sizeof(struct ethhdr));
+ if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
+ arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
+ if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
+ return true;
+ }
+ break;
+ case ETH_P_IPV6:
+ ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
+ icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
+ sizeof(struct ipv6hdr));
+ if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {
+ if (!memcmp(&ipv6->saddr, &ipv6->daddr,
+ sizeof(struct in6_addr)))
+ return true;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return false;
+}
+
/*
* This function processes the received packet and forwards it
* to kernel/upper layer.
@@ -90,6 +132,13 @@ int mwifiex_process_rx_packet(struct mwifiex_private *priv,
either the reconstructed EthII frame or the 802.2/llc/snap frame */
skb_pull(skb, hdr_chop);
+ if (priv->hs2_enabled &&
+ mwifiex_discard_gratuitous_arp(priv, skb)) {
+ dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
priv->rxpd_rate = local_rx_pd->rx_rate;
priv->rxpd_htinfo = local_rx_pd->ht_info;