Hi, I am implementing a source routed protocol(like DSR) using netfilter hooks. After rerouting the skb in my local_out handler, I return NF_STOLEN and call the okfn (dst_output) directly. On testing the code, we found that the local_out handler is being called, before the previous call to local_out has returned. We were testing our protocol by pinging. In the first call of local_out, we get a normal echo packet(type 8), but in the second call we get icmp packet types > 18 (NR_ICMP_TYPES). We believe this caused the kernel panic that we observed. However, in the oops trace the EIP value was 0x14000000, which we belive is not pointing to our module. Infact in many of the dumps we observed, the call trace did not contain any of our functions. We are using the vanilla version of 2.6.10 kernel with NF_DEBUG,KERNEL_DEBUG support enabled. SMP and PREEMPTIBLE are _NOT_ enabled in the kernel. Could this crash be due to the fact that we are calling the okfn ourselves from local_out, which may call a function thru the dst->output, which ultimately goes thru the LOCAL_OUT hook again, effectively we are somehow calling ourselves. But we are still not clear of the root of the problem we are facing. We have been trying very hard to debug this problem, any help would be greatly appreciated.. Thanks in advance. Eagerly awaiting your reply. Yours Sincerely Vinay Reddy. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
