Le mercredi 19 octobre 2011 à 12:24 +0530, raviraj joshi a écrit : > Hi, > > We are making a kernel level packet capture module as a part of our BE project . > We are finding it difficult to understand kenel networking code. > We studied structures and functions like sk_buff, netif_rx(),dev_alloc_skb. > > However we were not able to trace the actual path a simple packet follows. > > Moreover we tried to count the no of times netif_rx function was > called it was much much lower than amount of packets actually being > received. > > Can anyone please let us know the reason for this and how to approach > the problem of writing a kernel level packet capture module ,resoruces > we need to refer to (we are currently constrained to documents on > kernel-networking available online). > Most drivers call netif_receive_skb() from softirq handler netif_rx() is used only on cases where we are in hard irq handler, or we want to avoid a recursion (tunnels for example) To install a packet capture, you should take a look at dev_add_pack() and friends [ net/packet/af_packet.c being a good reference ] -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
