CODEWITHSUNDEEP
network-programminglinux-kernel
Ilya Matveychikov
Ilya Matveychikov

Reputation: 4024

Pushing SKB to the network stack

I have net_device which has the ndo_start_xmit function implemented.

When the ndo_start_xmit function is called I have an skb that contains the IP packet. I'll need to overt the packet with IP+UDP headers and send it back to the routing system.

The problem is that, when I call the dst_input(skb) or dst_output(skb), I'll catch the NULL pointer dereference error. It seems that I can't use this functions to push the encapsulated packet into the network stack.

What is the solution?

Upvotes: 2

Views: 682

Answers (2)

EnterKEY
EnterKEY

Reputation: 1222

During packet transmission (from driver to network link)

Copy data from the socket buffer (skb->data) to the driver kernel buffer (inside the hard_start_xmit function).

During packet reception (from network link to driver)

Create a skb buffer.Copy data from the driver kernel buffer to the socket buffer and hand over to the kernel network stack using the netif_rx() function.

Upvotes: 3

user2699113
user2699113

Reputation: 4509

If you want to push an skb into the kernel stack, just use the netif_rx(skb) function.

Upvotes: 2

Related Questions