Hi, I have a plugin node in which I want to process some received packets. When a packet is destined to an IP address that is configured on a loopback interface, I want to be able to lookup some data based on the sw_if_index of the loopback interface. Packets that are sent to the loopback address are received on hardware interfaces, so I cannot look at sw_if_index[VLIB_RX] in the vnet buffer opaque data to find out that the packet destination address belongs to a loopback. I was hoping that ip.adj_index[VLIB_TX] would contain data that would help me do what I'm trying to do, but that does not seem to be the case. In ip4-lookup, a FIB entry is found which matches the loopback address. The index of the adjacency for the path is stored in ip.adj_index[VLIB_TX]. But the stored value is subsequently overwritten in ip4-local during the call to ip4_local_check_src(). That function does a lookup on the source IP address and overwrites both ip.adj_index[VLIB_RX] and ip.adj_index[VLIB_TX] with the index retrieved by the lookup.
I can work around this in my plugin code if I need to but it would be nice to be able to use the adjacency data that was retrieved by ip4-lookup. Would it break anything if ip4_local_check_src() only updates ip.adj_index[VLIB_RX] and leaves the contents of ip.adj_index[VLIB_TX] intact? Thanks, -Matt
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