nat: revert respect udp checksum

[vpp.git] / src / plugins / nat / in2out.c

diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
index 802202d..c69bc61 100755 (executable)
--- a/src/plugins/nat/in2out.c
+++ b/src/plugins/nat/in2out.c
@@ -1075,11 +1075,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
                                 src_address /* changed member */ );
          ip0->checksum = ip_csum_fold (sum0);
 
-         old_port0 = udp0->src_port;
-         new_port0 = udp0->src_port = s0->out2in.port;
-
          if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
            {
+             old_port0 = tcp0->src_port;
+             tcp0->src_port = s0->out2in.port;
+             new_port0 = tcp0->src_port;
+
              sum0 = tcp0->checksum;
              sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
                                     ip4_header_t,
@@ -1093,17 +1094,9 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
            }
          else
            {
-             if (PREDICT_FALSE (udp0->checksum))
-               {
-                 sum0 = udp0->checksum;
-                 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                        ip4_header_t,
-                                        dst_address /* changed member */ );
-                 sum0 = ip_csum_update (sum0, old_port0, new_port0,
-                                        ip4_header_t /* cheat */ ,
-                                        length /* changed member */ );
-                 udp0->checksum = ip_csum_fold (sum0);
-               }
+             old_port0 = udp0->src_port;
+             udp0->src_port = s0->out2in.port;
+             udp0->checksum = 0;
              udp_packets++;
            }
 
@@ -1271,11 +1264,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
                                 src_address /* changed member */ );
          ip1->checksum = ip_csum_fold (sum1);
 
-         old_port1 = udp1->src_port;
-         new_port1 = udp1->src_port = s1->out2in.port;
-
          if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
            {
+             old_port1 = tcp1->src_port;
+             tcp1->src_port = s1->out2in.port;
+             new_port1 = tcp1->src_port;
+
              sum1 = tcp1->checksum;
              sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
                                     ip4_header_t,
@@ -1289,17 +1283,9 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
            }
          else
            {
-             if (PREDICT_FALSE (udp1->checksum))
-               {
-                 sum1 = udp1->checksum;
-                 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
-                                        ip4_header_t,
-                                        dst_address /* changed member */ );
-                 sum1 = ip_csum_update (sum1, old_port1, new_port1,
-                                        ip4_header_t /* cheat */ ,
-                                        length /* changed member */ );
-                 udp1->checksum = ip_csum_fold (sum1);
-               }
+             old_port1 = udp1->src_port;
+             udp1->src_port = s1->out2in.port;
+             udp1->checksum = 0;
              udp_packets++;
            }
 
@@ -1502,11 +1488,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
                                 src_address /* changed member */ );
          ip0->checksum = ip_csum_fold (sum0);
 
-         old_port0 = udp0->src_port;
-         new_port0 = udp0->src_port = s0->out2in.port;
-
          if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
            {
+             old_port0 = tcp0->src_port;
+             tcp0->src_port = s0->out2in.port;
+             new_port0 = tcp0->src_port;
+
              sum0 = tcp0->checksum;
              sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
                                     ip4_header_t,
@@ -1520,17 +1507,9 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
            }
          else
            {
-             if (PREDICT_FALSE (udp0->checksum))
-               {
-                 sum0 = udp0->checksum;
-                 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                        ip4_header_t,
-                                        dst_address /* changed member */ );
-                 sum0 = ip_csum_update (sum0, old_port0, new_port0,
-                                        ip4_header_t /* cheat */ ,
-                                        length /* changed member */ );
-                 udp0->checksum = ip_csum_fold (sum0);
-               }
+             old_port0 = udp0->src_port;
+             udp0->src_port = s0->out2in.port;
+             udp0->checksum = 0;
              udp_packets++;
            }
 
@@ -1890,11 +1869,12 @@ VLIB_NODE_FN (nat44_in2out_reass_node) (vlib_main_t * vm,
 
          if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
            {
-             old_port0 = udp0->src_port;
-             new_port0 = udp0->src_port = s0->out2in.port;
-
              if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
                {
+                 old_port0 = tcp0->src_port;
+                 tcp0->src_port = s0->out2in.port;
+                 new_port0 = tcp0->src_port;
+
                  sum0 = tcp0->checksum;
                  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
                                         ip4_header_t,
@@ -1904,16 +1884,11 @@ VLIB_NODE_FN (nat44_in2out_reass_node) (vlib_main_t * vm,
                                         length /* changed member */ );
                  tcp0->checksum = ip_csum_fold (sum0);
                }
-             else if (PREDICT_FALSE (udp0->checksum))
+             else
                {
-                 sum0 = udp0->checksum;
-                 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                        ip4_header_t,
-                                        dst_address /* changed member */ );
-                 sum0 = ip_csum_update (sum0, old_port0, new_port0,
-                                        ip4_header_t /* cheat */ ,
-                                        length /* changed member */ );
-                 udp0->checksum = ip_csum_fold (sum0);
+                 old_port0 = udp0->src_port;
+                 udp0->src_port = s0->out2in.port;
+                 udp0->checksum = 0;
                }
            }
 
@@ -2124,11 +2099,11 @@ VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
 
          if (PREDICT_FALSE (new_port0 != udp0->dst_port))
            {
-             old_port0 = udp0->src_port;
-             udp0->src_port = new_port0;
-
              if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
                {
+                 old_port0 = tcp0->src_port;
+                 tcp0->src_port = new_port0;
+
                  sum0 = tcp0->checksum;
                  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
                                         ip4_header_t,
@@ -2139,16 +2114,11 @@ VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
                  mss_clamping (sm, tcp0, &sum0);
                  tcp0->checksum = ip_csum_fold (sum0);
                }
-             else if (udp0->checksum)
+             else
                {
-                 sum0 = udp0->checksum;
-                 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                        ip4_header_t,
-                                        dst_address /* changed member */ );
-                 sum0 = ip_csum_update (sum0, old_port0, new_port0,
-                                        ip4_header_t /* cheat */ ,
-                                        length /* changed member */ );
-                 udp0->checksum = ip_csum_fold (sum0);
+                 old_port0 = udp0->src_port;
+                 udp0->src_port = new_port0;
+                 udp0->checksum = 0;
                }
            }
          else
@@ -2162,14 +2132,6 @@ VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
                  mss_clamping (sm, tcp0, &sum0);
                  tcp0->checksum = ip_csum_fold (sum0);
                }
-             else if (udp0->checksum)
-               {
-                 sum0 = udp0->checksum;
-                 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                        ip4_header_t,
-                                        dst_address /* changed member */ );
-                 udp0->checksum = ip_csum_fold (sum0);
-               }
            }
 
          /* Hairpinning */