[lwip-users] What is pbuf's payload?

[Chen]

Hi there,

I am trying to understand pbuf's payload referenced in
tcpip_input(
struct pbuf *p,
struct
netif *inp)

pbuf's payload is defined as void *, what are the
possible structures it can be under tcpip_input()?

since tcpip_input deals with udp and tcp only, is it just the actual data
from udp and tcp packets?

thanks for any pointer

Chen