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authorDave Barach <dave@barachs.net>2020-05-29 16:34:50 -0400
committerMatthew Smith <mgsmith@netgate.com>2020-06-01 13:01:10 +0000
commit63c672c440d92cc570c587254afb4167617ec0b7 (patch)
tree55044dcff1c59ec209a865af1d041a5bf5272b4d /src/plugins/nat/in2out.c
parent353535bb4856d8ee6d818a3c75b8b576b9967ee4 (diff)
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 <dave@barachs.net> Change-Id: I621ed99329c04ef358035747dde599c0016b58f5
Diffstat (limited to 'src/plugins/nat/in2out.c')
-rw-r--r--src/plugins/nat/in2out.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
index 8f92bae0302..a448867cd4f 100644
--- 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 */
);