ptp: Classify ptp over ip over vlan packets

This extends the ptp bpf to also match ptp over ip over vlan packets. The ptp
classes are changed to orthogonal bitfields representing version, transport
and vlan values to simplify matching.

Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 92 insertions, 47 deletions

diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index 6b56f85951e5..ab92f67da035 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -256,23 +256,21 @@ static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
 		      u16 ts_seqid, u8 ts_msgtype)
 {
 	u16 *seqid;
-	unsigned int offset;
+	unsigned int offset = 0;
 	u8 *msgtype, *data = skb->data;
 
-	switch (ptp_class) {
-	case PTP_CLASS_V1_IPV4:
-	case PTP_CLASS_V2_IPV4:
-		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
-		break;
-	case PTP_CLASS_V1_IPV6:
-	case PTP_CLASS_V2_IPV6:
-		offset = OFF_PTP6;
+	if (ptp_class & PTP_CLASS_VLAN)
+		offset += VLAN_HLEN;
+
+	switch (ptp_class & PTP_CLASS_PMASK) {
+	case PTP_CLASS_IPV4:
+		offset += ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
 		break;
-	case PTP_CLASS_V2_L2:
-		offset = ETH_HLEN;
+	case PTP_CLASS_IPV6:
+		offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
 		break;
-	case PTP_CLASS_V2_VLAN:
-		offset = ETH_HLEN + VLAN_HLEN;
+	case PTP_CLASS_L2:
+		offset += ETH_HLEN;
 		break;
 	default:
 		return 0;
diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 293ad064905d..53bd1af68422 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -856,20 +856,18 @@ static int is_sync(struct sk_buff *skb, int type)
 	u8 *data = skb->data, *msgtype;
 	unsigned int offset = 0;
 
-	switch (type) {
-	case PTP_CLASS_V1_IPV4:
-	case PTP_CLASS_V2_IPV4:
-		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
-		break;
-	case PTP_CLASS_V1_IPV6:
-	case PTP_CLASS_V2_IPV6:
-		offset = OFF_PTP6;
+	if (type & PTP_CLASS_VLAN)
+		offset += VLAN_HLEN;
+
+	switch (type & PTP_CLASS_PMASK) {
+	case PTP_CLASS_IPV4:
+		offset += ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
 		break;
-	case PTP_CLASS_V2_L2:
-		offset = ETH_HLEN;
+	case PTP_CLASS_IPV6:
+		offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
 		break;
-	case PTP_CLASS_V2_VLAN:
-		offset = ETH_HLEN + VLAN_HLEN;
+	case PTP_CLASS_L2:
+		offset += ETH_HLEN;
 		break;
 	default:
 		return 0;
@@ -889,25 +887,23 @@ static int is_sync(struct sk_buff *skb, int type)
 static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts)
 {
 	u16 *seqid;
-	unsigned int offset;
+	unsigned int offset = 0;
 	u8 *msgtype, *data = skb_mac_header(skb);
 
 	/* check sequenceID, messageType, 12 bit hash of offset 20-29 */
 
-	switch (type) {
-	case PTP_CLASS_V1_IPV4:
-	case PTP_CLASS_V2_IPV4:
-		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
-		break;
-	case PTP_CLASS_V1_IPV6:
-	case PTP_CLASS_V2_IPV6:
-		offset = OFF_PTP6;
+	if (type & PTP_CLASS_VLAN)
+		offset += VLAN_HLEN;
+
+	switch (type & PTP_CLASS_PMASK) {
+	case PTP_CLASS_IPV4:
+		offset += ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
 		break;
-	case PTP_CLASS_V2_L2:
-		offset = ETH_HLEN;
+	case PTP_CLASS_IPV6:
+		offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
 		break;
-	case PTP_CLASS_V2_VLAN:
-		offset = ETH_HLEN + VLAN_HLEN;
+	case PTP_CLASS_L2:
+		offset += ETH_HLEN;
 		break;
 	default:
 		return 0;
diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h
index 7dfed71d76a6..159c987b1853 100644
--- a/include/linux/ptp_classify.h
+++ b/include/linux/ptp_classify.h
@@ -33,8 +33,8 @@
 #define PTP_CLASS_IPV4  0x10 /* event in an IPV4 UDP packet */
 #define PTP_CLASS_IPV6  0x20 /* event in an IPV6 UDP packet */
 #define PTP_CLASS_L2    0x30 /* event in a L2 packet */
-#define PTP_CLASS_VLAN  0x40 /* event in a VLAN tagged L2 packet */
-#define PTP_CLASS_PMASK 0xf0 /* mask for the packet type field */
+#define PTP_CLASS_PMASK 0x30 /* mask for the packet type field */
+#define PTP_CLASS_VLAN  0x40 /* event in a VLAN tagged packet */
 
 #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4)
 #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */
@@ -54,7 +54,6 @@
 #define IP6_HLEN	40
 #define UDP_HLEN	8
 #define OFF_IHL		14
-#define OFF_PTP6	(ETH_HLEN + IP6_HLEN + UDP_HLEN)
 #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)
 
 #if defined(CONFIG_NET_PTP_CLASSIFY)
diff --git a/net/core/ptp_classifier.c b/net/core/ptp_classifier.c
index d3027a73fd4b..12ab7b4be609 100644
--- a/net/core/ptp_classifier.c
+++ b/net/core/ptp_classifier.c
@@ -52,14 +52,43 @@
  * test_8021q:
  *   jneq #0x8100, test_ieee1588   ; ETH_P_8021Q ?
  *   ldh [16]                      ; load inner type
- *   jneq #0x88f7, drop_ieee1588   ; ETH_P_1588 ?
+ *   jneq #0x88f7, test_8021q_ipv4 ; ETH_P_1588 ?
  *   ldb [18]                      ; load payload
  *   and #0x8                      ; as we don't have ports here, test
  *   jneq #0x0, drop_ieee1588      ; for PTP_GEN_BIT and drop these
  *   ldh [18]                      ; reload payload
  *   and #0xf                      ; mask PTP_CLASS_VMASK
- *   or #0x40                      ; PTP_CLASS_V2_VLAN
+ *   or #0x70                      ; PTP_CLASS_VLAN|PTP_CLASS_L2
+ *   ret a                         ; return PTP class
+ *
+ * ; PTP over UDP over IPv4 over 802.1Q over Ethernet
+ * test_8021q_ipv4:
+ *   jneq #0x800, test_8021q_ipv6  ; ETH_P_IP ?
+ *   ldb [27]                      ; load proto
+ *   jneq #17, drop_8021q_ipv4     ; IPPROTO_UDP ?
+ *   ldh [24]                      ; load frag offset field
+ *   jset #0x1fff, drop_8021q_ipv4; don't allow fragments
+ *   ldxb 4*([18]&0xf)             ; load IP header len
+ *   ldh [x + 20]                  ; load UDP dst port
+ *   jneq #319, drop_8021q_ipv4    ; is port PTP_EV_PORT ?
+ *   ldh [x + 26]                  ; load payload
+ *   and #0xf                      ; mask PTP_CLASS_VMASK
+ *   or #0x50                      ; PTP_CLASS_VLAN|PTP_CLASS_IPV4
+ *   ret a                         ; return PTP class
+ *   drop_8021q_ipv4: ret #0x0     ; PTP_CLASS_NONE
+ *
+ * ; PTP over UDP over IPv6 over 802.1Q over Ethernet
+ * test_8021q_ipv6:
+ *   jneq #0x86dd, drop_8021q_ipv6 ; ETH_P_IPV6 ?
+ *   ldb [24]                      ; load proto
+ *   jneq #17, drop_8021q_ipv6           ; IPPROTO_UDP ?
+ *   ldh [60]                      ; load UDP dst port
+ *   jneq #319, drop_8021q_ipv6          ; is port PTP_EV_PORT ?
+ *   ldh [66]                      ; load payload
+ *   and #0xf                      ; mask PTP_CLASS_VMASK
+ *   or #0x60                      ; PTP_CLASS_VLAN|PTP_CLASS_IPV6
  *   ret a                         ; return PTP class
+ *   drop_8021q_ipv6: ret #0x0     ; PTP_CLASS_NONE
  *
  * ; PTP over Ethernet
  * test_ieee1588:
@@ -113,16 +142,39 @@ void __init ptp_classifier_init(void)
 		{ 0x44,  0,  0, 0x00000020 },
 		{ 0x16,  0,  0, 0x00000000 },
 		{ 0x06,  0,  0, 0x00000000 },
-		{ 0x15,  0,  9, 0x00008100 },
+		{ 0x15,  0, 32, 0x00008100 },
 		{ 0x28,  0,  0, 0x00000010 },
-		{ 0x15,  0, 15, 0x000088f7 },
+		{ 0x15,  0,  7, 0x000088f7 },
 		{ 0x30,  0,  0, 0x00000012 },
 		{ 0x54,  0,  0, 0x00000008 },
-		{ 0x15,  0, 12, 0x00000000 },
+		{ 0x15,  0, 35, 0x00000000 },
 		{ 0x28,  0,  0, 0x00000012 },
 		{ 0x54,  0,  0, 0x0000000f },
-		{ 0x44,  0,  0, 0x00000040 },
+		{ 0x44,  0,  0, 0x00000070 },
+		{ 0x16,  0,  0, 0x00000000 },
+		{ 0x15,  0, 12, 0x00000800 },
+		{ 0x30,  0,  0, 0x0000001b },
+		{ 0x15,  0,  9, 0x00000011 },
+		{ 0x28,  0,  0, 0x00000018 },
+		{ 0x45,  7,  0, 0x00001fff },
+		{ 0xb1,  0,  0, 0x00000012 },
+		{ 0x48,  0,  0, 0x00000014 },
+		{ 0x15,  0,  4, 0x0000013f },
+		{ 0x48,  0,  0, 0x0000001a },
+		{ 0x54,  0,  0, 0x0000000f },
+		{ 0x44,  0,  0, 0x00000050 },
+		{ 0x16,  0,  0, 0x00000000 },
+		{ 0x06,  0,  0, 0x00000000 },
+		{ 0x15,  0,  8, 0x000086dd },
+		{ 0x30,  0,  0, 0x00000018 },
+		{ 0x15,  0,  6, 0x00000011 },
+		{ 0x28,  0,  0, 0x0000003c },
+		{ 0x15,  0,  4, 0x0000013f },
+		{ 0x28,  0,  0, 0x00000042 },
+		{ 0x54,  0,  0, 0x0000000f },
+		{ 0x44,  0,  0, 0x00000060 },
 		{ 0x16,  0,  0, 0x00000000 },
+		{ 0x06,  0,  0, 0x00000000 },
 		{ 0x15,  0,  7, 0x000088f7 },
 		{ 0x30,  0,  0, 0x0000000e },
 		{ 0x54,  0,  0, 0x00000008 },