diff options
| author |   Martin Gálik <magalik@cisco.com> | 2017-04-27 02:13:26 -0700 |
|---|---|---|
| committer |   Ole Trøan <otroan@employees.org> | 2017-04-27 12:03:46 +0000 |
| commit | f7e655d69a3325b8050eb09bc6065fac10bcb81b (patch) | |
| tree | 26a37d5b9edc9b724988c8cad94e503f54598879 | |
| parent | 3ef16710dc33b5b27730ced10008e2a69f81e147 (diff) | |
CGN: Send ICMP error packet if user is out of sessions available
Change-Id: I19a6015fde7342588cfa9c7a4f07016aa339cc72
Signed-off-by: Martin Gálik <magalik@cisco.com>
| -rw-r--r-- | src/plugins/snat/in2out.c | 27 | ||||
| -rw-r--r-- | test/test_snat.py | 14 |
2 files changed, 34 insertions, 7 deletions
diff --git a/src/plugins/snat/in2out.c b/src/plugins/snat/in2out.c index 4970fce3004..f7d29c69fe1 100644 --- a/src/plugins/snat/in2out.c +++ b/src/plugins/snat/in2out.c @@ -1635,8 +1635,13 @@ snat_det_in2out_node_fn (vlib_main_t * vm, } if (PREDICT_FALSE(!ses0)) { - next0 = SNAT_IN2OUT_NEXT_DROP; - b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; + /* too many sessions for user, send ICMP error packet */ + + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable, + ICMP4_destination_unreachable_destination_unreachable_host, + 0); + next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace0; } } @@ -1780,8 +1785,13 @@ snat_det_in2out_node_fn (vlib_main_t * vm, } if (PREDICT_FALSE(!ses1)) { - next1 = SNAT_IN2OUT_NEXT_DROP; - b1->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; + /* too many sessions for user, send ICMP error packet */ + + vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b1, ICMP4_destination_unreachable, + ICMP4_destination_unreachable_destination_unreachable_host, + 0); + next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace1; } } @@ -1961,8 +1971,13 @@ snat_det_in2out_node_fn (vlib_main_t * vm, } if (PREDICT_FALSE(!ses0)) { - next0 = SNAT_IN2OUT_NEXT_DROP; - b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; + /* too many sessions for user, send ICMP error packet */ + + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable, + ICMP4_destination_unreachable_destination_unreachable_host, + 0); + next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace00; } } diff --git a/test/test_snat.py b/test/test_snat.py index f90d9067850..da9f1b0bd04 100644 --- a/test/test_snat.py +++ b/test/test_snat.py @@ -1895,12 +1895,24 @@ class TestDeterministicNAT(MethodHolder): p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) / - UDP(sport=3000, dport=3000)) + UDP(sport=3001, dport=3002)) self.pg0.add_stream(p) self.pg_enable_capture(self.pg_interfaces) self.pg_start() capture = self.pg1.assert_nothing_captured() + # verify ICMP error packet + capture = self.pg0.get_capture(1) + p = capture[0] + self.assertTrue(p.haslayer(ICMP)) + icmp = p[ICMP] + self.assertEqual(icmp.type, 3) + self.assertEqual(icmp.code, 1) + self.assertTrue(icmp.haslayer(IPerror)) + inner_ip = icmp[IPerror] + self.assertEqual(inner_ip[UDPerror].sport, 3001) + self.assertEqual(inner_ip[UDPerror].dport, 3002) + dms = self.vapi.snat_det_map_dump() self.assertEqual(1000, dms[0].ses_num) |