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authorFilip Varga <fivarga@cisco.com>2019-10-21 18:18:00 +0200
committerOle Trøan <otroan@employees.org>2019-11-05 12:46:41 +0000
commit16572355c9069e2e8e4836dc6bd6a65feed2d390 (patch)
tree0bdbfee67f447e374626404f1949b8da6db0aaab /src/plugins/nat/nat_det_in2out.c
parent42693521f6046997133c8f63bcfc9d615d96f69d (diff)
nat: respect udp checksum
Type: fix Change-Id: I732be02d2e2b854eb589c3fa10f980ef2dbe8dfc Signed-off-by: Filip Varga <fivarga@cisco.com>
Diffstat (limited to 'src/plugins/nat/nat_det_in2out.c')
-rw-r--r--src/plugins/nat/nat_det_in2out.c69
1 files changed, 48 insertions, 21 deletions
diff --git a/src/plugins/nat/nat_det_in2out.c b/src/plugins/nat/nat_det_in2out.c
index 918e1f5f9c0..832a2bae947 100644
--- a/src/plugins/nat/nat_det_in2out.c
+++ b/src/plugins/nat/nat_det_in2out.c
@@ -392,7 +392,8 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
}
}
- new_port0 = ses0->out.out_port;
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0 = ses0->out.out_port;
old_addr0.as_u32 = ip0->src_address.as_u32;
ip0->src_address.as_u32 = new_addr0.as_u32;
@@ -424,9 +425,6 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
&& ses0->state == SNAT_SESSION_UNKNOWN)
ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
- old_port0 = tcp0->src;
- tcp0->src = new_port0;
-
sum0 = tcp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
ip4_header_t,
@@ -440,9 +438,20 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
else
{
ses0->state = SNAT_SESSION_UDP_ACTIVE;
- old_port0 = udp0->src_port;
- udp0->src_port = new_port0;
- udp0->checksum = 0;
+
+ if (PREDICT_FALSE (udp0->checksum))
+ {
+ sum0 = udp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ 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);
+ }
}
switch (ses0->state)
@@ -556,7 +565,8 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
}
}
- new_port1 = ses1->out.out_port;
+ old_port1 = udp1->src_port;
+ udp1->src_port = new_port1 = ses1->out.out_port;
old_addr1.as_u32 = ip1->src_address.as_u32;
ip1->src_address.as_u32 = new_addr1.as_u32;
@@ -588,9 +598,6 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
&& ses1->state == SNAT_SESSION_UNKNOWN)
ses1->state = SNAT_SESSION_TCP_ESTABLISHED;
- old_port1 = tcp1->src;
- tcp1->src = new_port1;
-
sum1 = tcp1->checksum;
sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
ip4_header_t,
@@ -604,9 +611,20 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
else
{
ses1->state = SNAT_SESSION_UDP_ACTIVE;
- old_port1 = udp1->src_port;
- udp1->src_port = new_port1;
- udp1->checksum = 0;
+
+ if (PREDICT_FALSE (udp1->checksum))
+ {
+ sum1 = udp1->checksum;
+ sum1 =
+ ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
+ 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);
+ }
}
switch (ses1->state)
@@ -756,7 +774,8 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
}
}
- new_port0 = ses0->out.out_port;
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0 = ses0->out.out_port;
old_addr0.as_u32 = ip0->src_address.as_u32;
ip0->src_address.as_u32 = new_addr0.as_u32;
@@ -788,9 +807,6 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
&& ses0->state == SNAT_SESSION_UNKNOWN)
ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
- old_port0 = tcp0->src;
- tcp0->src = new_port0;
-
sum0 = tcp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
ip4_header_t,
@@ -804,9 +820,20 @@ VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
else
{
ses0->state = SNAT_SESSION_UDP_ACTIVE;
- old_port0 = udp0->src_port;
- udp0->src_port = new_port0;
- udp0->checksum = 0;
+
+ if (PREDICT_FALSE (udp0->checksum))
+ {
+ sum0 = udp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ 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);
+ }
}
switch (ses0->state)