netif_rx dropping the packet

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Hi

I am facing a problem with the part of kernel code that  I am developing for
a linux router. The objective is to encapsulate the received IP packet with
a UDP header and an extra IP header and forward it to a different
destination.
I am encapsulating the original packet and passing it to the stack using
'netif_rx'.  I want the stack to forward the packet to changed destination.
At the destination the packet will be decapsulated.
But once the packet is given to the 'netif_rx', stack is dropping the packet
silently.
I don't know which part of the stack code is dropping the packet.

I need help in debugging this problem.I am giving the following details
about the encapsulation:

Dump of the ICMP ping packet received:
0 0 24 c0 2d 63 0 80 48 18 9e 5a 8 0 45 0
0 3c 1 cb 0 0 80 1 dc 18 ac 10 2 5c ac 10
2 61 8 0 4a 5c 2 0 1 0 61 62 63 64 65 66
67 68 69 6a 6b 6c 6d 6e 6f 70 71 72 73 74 75 76
77 61 62 63 64 65 66 67 68 69

Packet Dump after Encapsulation: This packet is given to stack using
'netif_rx'
45 0 0 74 56 34 0 0 f0 11 ba 8b ac 10 16 1
ac 10 16 3 d4 31 d4 31 0 8 0 0 1 1 1 11
22 33 44 55 66 0 0 0 0 0 0 0 24 c0 2d 63
0 80 48 18 9e 5a 8 0 45 0 0 3c 1 cb 0 0
80 1 dc 18 ac 10 2 5c ac 10 2 61 8 0 4a 5c
2 0 1 0 61 62 63 64 65 66 67 68 69 6a 6b 6c
6d 6e 6f 70 71 72 73 74 75 76 77 61 62 63 64 65
66 67 68 69
I want this packet to be routed to IP address 172.16.22.3. The required
route is configured.
Is any thing wrong in the above encapsulated packet ?
I am modifiying the follwing skb params:

pSkb->ip_summed = CHECKSUM_UNNECESSARY;
/* I have tried others like NONE,HW with no improvements
 */

pSkb->protocol = htons(ETH_P_IP);
/* Since it is always an IP packet */

Can anyone help me find out the problem. I will provide any other details if
required.

TIA,
  venu maya



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