From ecbca13d7eb7f07fa27915ba1decac10fc98c89e Mon Sep 17 00:00:00 2001 From: Dave Barach Date: Fri, 29 May 2020 16:34:50 -0400 Subject: nat: update ip4-udp src port for checksum == 0 pkts Otherwise, the out2in path will discard return-path traffic with probability 1.0. Type: fix Fixes: gerrit 23963 / f126e746fc01c75bc99329d10ce9127b26b23814 Signed-off-by: Dave Barach Change-Id: I621ed99329c04ef358035747dde599c0016b58f5 (cherry picked from commit 63c672c440d92cc570c587254afb4167617ec0b7) --- src/plugins/nat/in2out.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'src') diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c index 8f92bae0302..a448867cd4f 100755 --- a/src/plugins/nat/in2out.c +++ b/src/plugins/nat/in2out.c @@ -1118,10 +1118,11 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { + udp0->src_port = s0->out2in.port; if (PREDICT_FALSE (udp0->checksum)) { old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port; - new_port0 = udp0->src_port = s0->out2in.port; + new_port0 = udp0->src_port; sum0 = udp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); @@ -1325,10 +1326,11 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { + udp1->src_port = s1->out2in.port; if (PREDICT_FALSE (udp1->checksum)) { old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port; - new_port1 = udp1->src_port = s1->out2in.port; + new_port1 = udp1->src_port; sum1 = udp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */ ); @@ -1567,10 +1569,11 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { + udp0->src_port = s0->out2in.port; if (PREDICT_FALSE (udp0->checksum)) { old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port; - new_port0 = udp0->src_port = s0->out2in.port; + new_port0 = udp0->src_port; sum0 = udp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); -- cgit 1.2.3-korg