FW: mbufs

 

Can someone show me or point me to a ‘simple’ example of how to create a struct mbuf for injecting into the stack to send a packet in/out the kernel?

 

I have a kernel level driver and I want to pass an mbuf in/out my driver using dlil_inject_if _.... Say I want to the source to be 00:0a:12:23:34:aa, the destination to be 00:0b:33:44:55:0d and the data is 240 bytes long, i.e. “abcdefghijklmnopq…..”

 

I have tried several methods of creating the mbuf but when I use dlil_if_inject_output I get an error = 22. But if I do an m_copyback of an mbuf I copied coming in I can make dlil_if_inject_output work, but not with the 240 bytes I want. Instead of going into a lot of explanation of what I am doing and why I basically just need to know how to create a ‘new’ mbuf with the data as described above for sending out/in the driver.

 

Thanks to all