nat: respect udp checksum

[vpp.git] / src / plugins / nat / out2in_ed.c

diff --git a/src/plugins/nat/out2in_ed.c b/src/plugins/nat/out2in_ed.c
index 50abebd..2067c51 100644 (file)
--- a/src/plugins/nat/out2in_ed.c
+++ b/src/plugins/nat/out2in_ed.c
@@ -919,11 +919,11 @@ nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
                                   src_address);
          ip0->checksum = ip_csum_fold (sum0);
 
+         old_port0 = udp0->dst_port;
+         new_port0 = udp0->dst_port = s0->in2out.port;
+
          if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
            {
-             old_port0 = tcp0->dst_port;
-             new_port0 = tcp0->dst_port = s0->in2out.port;
-
              sum0 = tcp0->checksum;
              sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
                                     dst_address);
@@ -946,15 +946,34 @@ nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
                  (sm, s0, tcp0, thread_index))
                goto trace00;
            }
+         else if (udp0->checksum)
+           {
+             sum0 = udp0->checksum;
+             sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+                                    dst_address);
+             sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
+                                    length);
+             if (PREDICT_FALSE (is_twice_nat_session (s0)))
+               {
+                 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
+                                        s0->ext_host_nat_addr.as_u32,
+                                        ip4_header_t, dst_address);
+                 sum0 = ip_csum_update (sum0, udp0->src_port,
+                                        s0->ext_host_nat_port, ip4_header_t,
+                                        length);
+                 udp0->src_port = s0->ext_host_nat_port;
+                 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
+               }
+             udp0->checksum = ip_csum_fold (sum0);
+             udp_packets++;
+           }
          else
            {
-             udp0->dst_port = s0->in2out.port;
-             if (is_twice_nat_session (s0))
+             if (PREDICT_FALSE (is_twice_nat_session (s0)))
                {
                  udp0->src_port = s0->ext_host_nat_port;
                  ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
                }
-             udp0->checksum = 0;
              udp_packets++;
            }
 
@@ -1157,11 +1176,11 @@ nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
                                   src_address);
          ip1->checksum = ip_csum_fold (sum1);
 
+         old_port1 = udp1->dst_port;
+         new_port1 = udp1->dst_port = s1->in2out.port;
+
          if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
            {
-             old_port1 = tcp1->dst_port;
-             new_port1 = tcp1->dst_port = s1->in2out.port;
-
              sum1 = tcp1->checksum;
              sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
                                     dst_address);
@@ -1184,15 +1203,34 @@ nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
                  (sm, s1, tcp1, thread_index))
                goto trace01;
            }
+         else if (udp1->checksum)
+           {
+             sum1 = udp1->checksum;
+             sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
+                                    dst_address);
+             sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
+                                    length);
+             if (PREDICT_FALSE (is_twice_nat_session (s1)))
+               {
+                 sum1 = ip_csum_update (sum1, ip1->src_address.as_u32,
+                                        s1->ext_host_nat_addr.as_u32,
+                                        ip4_header_t, dst_address);
+                 sum1 = ip_csum_update (sum1, udp1->src_port,
+                                        s1->ext_host_nat_port, ip4_header_t,
+                                        length);
+                 udp1->src_port = s1->ext_host_nat_port;
+                 ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32;
+               }
+             udp1->checksum = ip_csum_fold (sum1);
+             udp_packets++;
+           }
          else
            {
-             udp1->dst_port = s1->in2out.port;
-             if (is_twice_nat_session (s1))
+             if (PREDICT_FALSE (is_twice_nat_session (s1)))
                {
                  udp1->src_port = s1->ext_host_nat_port;
                  ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32;
                }
-             udp1->checksum = 0;
              udp_packets++;
            }
 
@@ -1429,11 +1467,11 @@ nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
                                   src_address);
          ip0->checksum = ip_csum_fold (sum0);
 
+         old_port0 = udp0->dst_port;
+         new_port0 = udp0->dst_port = s0->in2out.port;
+
          if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
            {
-             old_port0 = tcp0->dst_port;
-             new_port0 = tcp0->dst_port = s0->in2out.port;
-
              sum0 = tcp0->checksum;
              sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
                                     dst_address);
@@ -1456,15 +1494,34 @@ nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
                  (sm, s0, tcp0, thread_index))
                goto trace0;
            }
+         else if (udp0->checksum)
+           {
+             sum0 = udp0->checksum;
+             sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+                                    dst_address);
+             sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
+                                    length);
+             if (PREDICT_FALSE (is_twice_nat_session (s0)))
+               {
+                 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
+                                        s0->ext_host_nat_addr.as_u32,
+                                        ip4_header_t, dst_address);
+                 sum0 = ip_csum_update (sum0, udp0->src_port,
+                                        s0->ext_host_nat_port, ip4_header_t,
+                                        length);
+                 udp0->src_port = s0->ext_host_nat_port;
+                 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
+               }
+             udp0->checksum = ip_csum_fold (sum0);
+             udp_packets++;
+           }
          else
            {
-             udp0->dst_port = s0->in2out.port;
-             if (is_twice_nat_session (s0))
+             if (PREDICT_FALSE (is_twice_nat_session (s0)))
                {
                  udp0->src_port = s0->ext_host_nat_port;
                  ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
                }
-             udp0->checksum = 0;
              udp_packets++;
            }
 
@@ -1818,12 +1875,11 @@ VLIB_NODE_FN (nat44_ed_out2in_reass_node) (vlib_main_t * vm,
 
          if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
            {
+             old_port0 = udp0->dst_port;
+             new_port0 = udp0->dst_port = s0->in2out.port;
+
              if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
                {
-                 old_port0 = tcp0->dst_port;
-                 tcp0->dst_port = s0->in2out.port;
-                 new_port0 = tcp0->dst_port;
-
                  sum0 = tcp0->checksum;
                  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
                                         ip4_header_t,
@@ -1845,16 +1901,35 @@ VLIB_NODE_FN (nat44_ed_out2in_reass_node) (vlib_main_t * vm,
                    }
                  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);
+                 sum0 =
+                   ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
+                                   length);
+                 if (PREDICT_FALSE (is_twice_nat_session (s0)))
+                   {
+                     sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
+                                            s0->ext_host_nat_addr.as_u32,
+                                            ip4_header_t, dst_address);
+                     sum0 = ip_csum_update (sum0, udp0->src_port,
+                                            s0->ext_host_nat_port,
+                                            ip4_header_t, length);
+                     udp0->src_port = s0->ext_host_nat_port;
+                     ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
+                   }
+                 udp0->checksum = ip_csum_fold (sum0);
+               }
              else
                {
-                 old_port0 = udp0->dst_port;
-                 udp0->dst_port = s0->in2out.port;
-                 if (is_twice_nat_session (s0))
+                 if (PREDICT_FALSE (is_twice_nat_session (s0)))
                    {
                      udp0->src_port = s0->ext_host_nat_port;
                      ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
                    }
-                 udp0->checksum = 0;
                }
            }