zebra: fix a typo in the BPF filter setup for NS

Because of this unicast NS was not being trapped to FRR for redirection.

Signed-off-by: Anuradha Karuppiah <[email protected]>

zebra/zebra_evpn_arp_nd.c

@@ -422,18 +422,18 @@ static int zebra_evpn_arp_nd_sock_create(struct zebra_if *zif)
 
 /* BPF filter for snooping on unicast ARP req/replies and unicast IPv6 NS/NA -
  * tcpdump -dd '((ether[0] &1 == 0) and (arp or
- *               (icmp6 and (ip6[4] == 135 or ip6[40] == 136)))) and inbound'
+ *               (icmp6 and (ip6[40] == 135 or ip6[40] == 136)))) and inbound'
  */
 static struct sock_filter arp_nd_filter[] = {
-	{0x30, 0, 0, 0x00000000},  {0x45, 15, 0, 0x00000001},
-	{0x28, 0, 0, 0x0000000c},  {0x15, 10, 0, 0x00000806},
-	{0x15, 0, 12, 0x000086dd}, {0x30, 0, 0, 0x00000014},
-	{0x15, 3, 0, 0x0000003a},  {0x15, 0, 9, 0x0000002c},
-	{0x30, 0, 0, 0x00000036},  {0x15, 0, 7, 0x0000003a},
-	{0x30, 0, 0, 0x00000012},  {0x15, 2, 0, 0x00000087},
-	{0x30, 0, 0, 0x00000036},  {0x15, 0, 3, 0x00000088},
-	{0x28, 0, 0, 0xfffff004},  {0x15, 1, 0, 0x00000004},
-	{0x6, 0, 0, 0x00040000},   {0x6, 0, 0, 0x00000000},
+	{0x30, 0, 0, 0x00000000},  {0x45, 14, 0, 0x00000001},
+	{0x28, 0, 0, 0x0000000c},  {0x15, 9, 0, 0x00000806},
+	{0x15, 0, 11, 0x000086dd}, {0x30, 0, 0, 0x00000014},
+	{0x15, 3, 0, 0x0000003a},  {0x15, 0, 8, 0x0000002c},
+	{0x30, 0, 0, 0x00000036},  {0x15, 0, 6, 0x0000003a},
+	{0x30, 0, 0, 0x00000036},  {0x15, 1, 0, 0x00000087},
+	{0x15, 0, 3, 0x00000088},  {0x28, 0, 0, 0xfffff004},
+	{0x15, 1, 0, 0x00000004},  {0x6, 0, 0, 0x00040000},
+	{0x6, 0, 0, 0x00000000},
 };
 
 /* Setup socket per-access bridge port */