Hi! On 18:28 Tue 21 Jul , Loránd Jakab wrote: > Hello, > > I am working on implementing an experimental network protocol. I have > netfilter hook which changes the payload after the IP header and the > destination IP in packets with a certain protocol id. This part works. > > For some packets, I need to generate an extra packet. To do this, I copy > the sk_buff, modify stuff on the copy and try sending it with > dev_queue_xmit(), then modify the original and return NF_ACCEPT. The > result is: the original get through (the one with NF_ACCEPT) but the > copy doesn't. > > Here's the code for copying and sending the copy: > > static void send_payload(struct sk_buff *skb, struct in_addr rloc) Where do you call this function? Immediately before the ip stack calls dev_queue_xmit? If not, the ip stack might not have finished building the packet. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
