qcacmn: Add 802.1Q/802.1AD support for DHCP/EAPOL/ARP data check

If the data ether header contains 802.1Q and 802.1AD tag,
current API to identify DHCP/ARP/EAPOL frame will not work properly,
for 802.1Q/802.1AD frame, there is extra 4 or 8 bytes in ether header.
Add 802.1Q and 802.1AD support for DHCP/EAPOL/ARP check.

Change-Id: Ibf00bd9e1497ba9700abca10d840104a73238f56
CRs-Fixed: 2771942

qdf/inc/qdf_nbuf.h

@@ -51,6 +51,8 @@
 #define QDF_NBUF_TRAC_DHCP_SRV_PORT		67
 #define QDF_NBUF_TRAC_DHCP_CLI_PORT		68
 #define QDF_NBUF_TRAC_ETH_TYPE_OFFSET		12
+#define QDF_NBUF_TRAC_VLAN_ETH_TYPE_OFFSET	16
+#define QDF_NBUF_TRAC_DOUBLE_VLAN_ETH_TYPE_OFFSET	20
 #define QDF_NBUF_TRAC_EAPOL_ETH_TYPE		0x888E
 #define QDF_NBUF_TRAC_WAPI_ETH_TYPE		0x88b4
 #define QDF_NBUF_TRAC_ARP_ETH_TYPE		0x0806
@@ -84,7 +86,11 @@
 #define QDF_NBUF_TRAC_DHCP6_SRV_PORT		547
 #define QDF_NBUF_TRAC_DHCP6_CLI_PORT		546
 #define QDF_NBUF_TRAC_MDNS_SRC_N_DST_PORT	5353
-
+#define QDF_NBUF_TRAC_IP_OFFSET		14
+#define QDF_NBUF_TRAC_VLAN_IP_OFFSET		18
+#define QDF_NBUF_TRAC_DOUBLE_VLAN_IP_OFFSET	22
+/* One dword for IPv4 header size unit */
+#define QDF_NBUF_IPV4_HDR_SIZE_UNIT	4
 
 /* EAPOL Related MASK */
 #define EAPOL_PACKET_TYPE_OFFSET		15

qdf/inc/qdf_net_types.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2020 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -61,6 +61,7 @@ typedef __in6_addr_t in6_addr_t;
 #define QDF_ETH_TYPE_IPV4              0x0800  /* IPV4 */
 #define QDF_ETH_TYPE_IPV6              0x86dd  /* IPV6 */
 #define QDF_ETH_TYPE_8021Q             0x8100  /* 802.1Q vlan protocol */
+#define QDF_ETH_TYPE_8021AD            0x88a8  /* 802.1AD vlan protocol */
 #define QDF_IEEE80211_4ADDR_HDR_LEN     30
 #define QDF_IEEE80211_3ADDR_HDR_LEN     24
 #define QDF_IEEE80211_FC0_SUBTYPE_QOS   0x80

qdf/linux/src/qdf_nbuf.c

@@ -118,6 +118,61 @@ static qdf_atomic_t nbuf_count;
 static bool is_initial_mem_debug_disabled;
 #endif
 
+/**
+ *  __qdf_nbuf_get_ip_offset - Get IPV4/V6 header offset
+ * @data: Pointer to network data buffer
+ *
+ * Get the IP header offset in case of 8021Q and 8021AD
+ * tag is present in L2 header.
+ *
+ * Return: IP header offset
+ */
+static inline uint8_t __qdf_nbuf_get_ip_offset(uint8_t *data)
+{
+	uint16_t ether_type;
+
+	ether_type = *(uint16_t *)(data +
+				   QDF_NBUF_TRAC_ETH_TYPE_OFFSET);
+
+	if (unlikely(ether_type == QDF_SWAP_U16(QDF_ETH_TYPE_8021Q)))
+		return QDF_NBUF_TRAC_VLAN_IP_OFFSET;
+	else if (unlikely(ether_type == QDF_SWAP_U16(QDF_ETH_TYPE_8021AD)))
+		return QDF_NBUF_TRAC_DOUBLE_VLAN_IP_OFFSET;
+
+	return QDF_NBUF_TRAC_IP_OFFSET;
+}
+
+qdf_export_symbol(__qdf_nbuf_get_ip_offset);
+
+/**
+ *  __qdf_nbuf_get_ether_type - Get the ether type
+ * @data: Pointer to network data buffer
+ *
+ * Get the ether type in case of 8021Q and 8021AD tag
+ * is present in L2 header, e.g for the returned ether type
+ * value, if IPV4 data ether type 0x0800, return 0x0008.
+ *
+ * Return ether type.
+ */
+static inline uint16_t __qdf_nbuf_get_ether_type(uint8_t *data)
+{
+	uint16_t ether_type;
+
+	ether_type = *(uint16_t *)(data +
+				   QDF_NBUF_TRAC_ETH_TYPE_OFFSET);
+
+	if (unlikely(ether_type == QDF_SWAP_U16(QDF_ETH_TYPE_8021Q)))
+		ether_type = *(uint16_t *)(data +
+				QDF_NBUF_TRAC_VLAN_ETH_TYPE_OFFSET);
+	else if (unlikely(ether_type == QDF_SWAP_U16(QDF_ETH_TYPE_8021AD)))
+		ether_type = *(uint16_t *)(data +
+				QDF_NBUF_TRAC_DOUBLE_VLAN_ETH_TYPE_OFFSET);
+
+	return ether_type;
+}
+
+qdf_export_symbol(__qdf_nbuf_get_ether_type);
+
 /**
  * qdf_nbuf_tx_desc_count_display() - Displays the packet counter
  *
@@ -1370,12 +1425,21 @@ bool __qdf_nbuf_data_is_ipv4_dhcp_pkt(uint8_t *data)
 {
 	uint16_t sport;
 	uint16_t dport;
+	uint8_t ipv4_offset;
+	uint8_t ipv4_hdr_len;
+	struct iphdr *iphdr;
 
-	sport = (uint16_t)(*(uint16_t *)(data + QDF_NBUF_TRAC_IPV4_OFFSET +
+	if (__qdf_nbuf_get_ether_type(data) !=
-					 QDF_NBUF_TRAC_IPV4_HEADER_SIZE));
+	    QDF_SWAP_U16(QDF_NBUF_TRAC_IPV4_ETH_TYPE))
-	dport = (uint16_t)(*(uint16_t *)(data + QDF_NBUF_TRAC_IPV4_OFFSET +
+		return false;
-					 QDF_NBUF_TRAC_IPV4_HEADER_SIZE +
+
-					 sizeof(uint16_t)));
+	ipv4_offset = __qdf_nbuf_get_ip_offset(data);
+	iphdr = (struct iphdr *)(data + ipv4_offset);
+	ipv4_hdr_len = iphdr->ihl * QDF_NBUF_IPV4_HDR_SIZE_UNIT;
+
+	sport = *(uint16_t *)(data + ipv4_offset + ipv4_hdr_len);
+	dport = *(uint16_t *)(data + ipv4_offset + ipv4_hdr_len +
+			      sizeof(uint16_t));
 
 	if (((sport == QDF_SWAP_U16(QDF_NBUF_TRAC_DHCP_SRV_PORT)) &&
 	     (dport == QDF_SWAP_U16(QDF_NBUF_TRAC_DHCP_CLI_PORT))) ||
@@ -1400,8 +1464,7 @@ bool __qdf_nbuf_data_is_ipv4_eapol_pkt(uint8_t *data)
 {
 	uint16_t ether_type;
 
-	ether_type = (uint16_t)(*(uint16_t *)(data +
+	ether_type = __qdf_nbuf_get_ether_type(data);
-				QDF_NBUF_TRAC_ETH_TYPE_OFFSET));
 
 	if (ether_type == QDF_SWAP_U16(QDF_NBUF_TRAC_EAPOL_ETH_TYPE))
 		return true;
@@ -1469,8 +1532,7 @@ bool __qdf_nbuf_data_is_ipv4_arp_pkt(uint8_t *data)
 {
 	uint16_t ether_type;
 
-	ether_type = (uint16_t)(*(uint16_t *)(data +
+	ether_type = __qdf_nbuf_get_ether_type(data);
-				QDF_NBUF_TRAC_ETH_TYPE_OFFSET));
 
 	if (ether_type == QDF_SWAP_U16(QDF_NBUF_TRAC_ARP_ETH_TYPE))
 		return true;
@@ -1845,12 +1907,14 @@ bool __qdf_nbuf_data_is_ipv6_dhcp_pkt(uint8_t *data)
 {
 	uint16_t sport;
 	uint16_t dport;
+	uint8_t ipv6_offset;
 
-	sport = *(uint16_t *)(data + QDF_NBUF_TRAC_IPV6_OFFSET +
+	ipv6_offset = __qdf_nbuf_get_ip_offset(data);
-				QDF_NBUF_TRAC_IPV6_HEADER_SIZE);
+	sport = *(uint16_t *)(data + ipv6_offset +
-	dport = *(uint16_t *)(data + QDF_NBUF_TRAC_IPV6_OFFSET +
+			      QDF_NBUF_TRAC_IPV6_HEADER_SIZE);
-					QDF_NBUF_TRAC_IPV6_HEADER_SIZE +
+	dport = *(uint16_t *)(data + ipv6_offset +
-					sizeof(uint16_t));
+			      QDF_NBUF_TRAC_IPV6_HEADER_SIZE +
+			      sizeof(uint16_t));
 
 	if (((sport == QDF_SWAP_U16(QDF_NBUF_TRAC_DHCP6_SRV_PORT)) &&
 	     (dport == QDF_SWAP_U16(QDF_NBUF_TRAC_DHCP6_CLI_PORT))) ||