Hello People, I'm trying to write a target for netfilter which replace packet payload, but I'm having some troubles, cause I don't really know what is the best way to do it. I tried this way: /* payload points to the old payload in skb */ memcpy(payload,newpayload,newpayload_size*sizeof(char)); skb->len = skb->len-payload_size+newpayload_size; /*new checksum and ip total length*/ (skbuff is big enough to contain the new payload) and this way, using some skbuff api: /*Get ip+tcp/udp header*/ int header_len = payload - (char *) skb->data; char *header = kmalloc(sizeof(char)*header_len,GFP_KERNEL); memcpy(header,skb->data,header_len); /*Remove all data from skb */ skb_pull(skb,skb->len); /*Reserve new data space*/ skb_put(skb,newpayload_size+header_len); /*Copy old header and new payload*/ memcpy(skb->data,header,header_len); memcpy(skb->data+header_len,newpayload,newpayload_size); Both seems to work somehow (most of the time) but system takes a while to handle the packet and looking in kernel log there is this message more than once: BUG: schedule while atomic any idea?!-- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
