// Copyright (c) PLUMgrid, Inc. // Licensed under the Apache License, Version 2.0 (the "License") // test for packet modification #packed "false" struct IPKey { u32 dip:32; u32 sip:32; }; struct IPLeaf { u32 xdip:32; u32 xsip:32; u64 xlated_pkts:64; }; Table xlate(1024); struct skbuff { u32 type:32; }; u32 on_packet (struct skbuff *skb) { u32 ret:32 = 1; u32 orig_dip:32 = 0; u32 orig_sip:32 = 0; struct IPLeaf *xleaf; goto proto::ethernet; state proto::ethernet { } state proto::dot1q { } state proto::ip { orig_dip = $ip.dst; orig_sip = $ip.src; struct IPKey key = {.dip=orig_dip, .sip=orig_sip}; xlate.lookup(key, xleaf) {}; on_valid(xleaf) { incr_cksum(@ip.hchecksum, orig_dip, xleaf.xdip); incr_cksum(@ip.hchecksum, orig_sip, xleaf.xsip); // the below are equivalent pkt.rewrite_field($ip.dst, xleaf.xdip); $ip.src = xleaf.xsip; atomic_add(xleaf.xlated_pkts, 1); } } state proto::udp { on_valid(xleaf) { incr_cksum(@udp.crc, orig_dip, xleaf.xdip, 1); incr_cksum(@udp.crc, orig_sip, xleaf.xsip, 1); } } state proto::tcp { on_valid(xleaf) { incr_cksum(@tcp.cksum, orig_dip, xleaf.xdip, 1); incr_cksum(@tcp.cksum, orig_sip, xleaf.xsip, 1); } } state proto::vxlan { } state proto::gre { } state EOP { return ret; } }