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authorMatus Fabian <matfabia@cisco.com>2018-10-19 04:01:19 -0700
committerMatus Fabian <matfabia@cisco.com>2018-10-19 04:01:19 -0700
commitda41d729b9339528b6c9bd1e859792303d15eb78 (patch)
tree116fe56e60da986d7258d298d9ba70406e3f3f16
parent2f6d7bb93c157b874efb79a2d1583a4c368bf89a (diff)
NAT44: fix ICMP virtual fragmentation reassembly (VPP-1466)
Change-Id: I8006bca02948d9121f474a3d14f0576747bb3c51 Signed-off-by: Matus Fabian <matfabia@cisco.com>
-rwxr-xr-xsrc/plugins/nat/in2out.c48
-rw-r--r--src/plugins/nat/in2out_ed.c7
-rw-r--r--src/plugins/nat/nat44_hairpinning.c72
-rwxr-xr-xsrc/plugins/nat/out2in.c58
-rw-r--r--test/test_nat.py131
5 files changed, 144 insertions, 172 deletions
diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
index b99aef3944d..cb169814eac 100755
--- a/src/plugins/nat/in2out.c
+++ b/src/plugins/nat/in2out.c
@@ -952,8 +952,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
}
else
{
- if (PREDICT_FALSE
- (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP))
+ if (PREDICT_FALSE (proto0 == ~0))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
@@ -964,6 +963,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
next0 = SNAT_IN2OUT_NEXT_REASS;
goto trace00;
}
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace00;
+ }
}
key0.addr = ip0->src_address;
@@ -1131,8 +1136,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
}
else
{
- if (PREDICT_FALSE
- (proto1 == ~0 || proto1 == SNAT_PROTOCOL_ICMP))
+ if (PREDICT_FALSE (proto1 == ~0))
{
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
@@ -1143,6 +1147,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
next1 = SNAT_IN2OUT_NEXT_REASS;
goto trace01;
}
+
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace01;
+ }
}
key1.addr = ip1->src_address;
@@ -1346,8 +1356,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
}
else
{
- if (PREDICT_FALSE
- (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP))
+ if (PREDICT_FALSE (proto0 == ~0))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
@@ -1358,6 +1367,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
next0 = SNAT_IN2OUT_NEXT_REASS;
goto trace0;
}
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace0;
+ }
}
key0.addr = ip0->src_address;
@@ -1672,6 +1687,7 @@ nat44_in2out_reass_node_fn (vlib_main_t * vm,
nat_reass_ip4_t *reass0;
udp_header_t *udp0;
tcp_header_t *tcp0;
+ icmp46_header_t *icmp0;
snat_session_key_t key0;
clib_bihash_kv_8_8_t kv0, value0;
snat_session_t *s0 = 0;
@@ -1704,6 +1720,7 @@ nat44_in2out_reass_node_fn (vlib_main_t * vm,
ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
proto0 = ip_proto_to_snat_proto (ip0->protocol);
reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
@@ -1722,6 +1739,25 @@ nat44_in2out_reass_node_fn (vlib_main_t * vm,
if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
{
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_in2out_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+
+ if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP))
+ {
+ if (s0)
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ else
+ reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
+ nat_ip4_reass_get_frags (reass0,
+ &fragments_to_loopback);
+ }
+
+ goto trace0;
+ }
+
key0.addr = ip0->src_address;
key0.port = udp0->src_port;
key0.protocol = proto0;
diff --git a/src/plugins/nat/in2out_ed.c b/src/plugins/nat/in2out_ed.c
index 8db53c08142..f9f8d776eb4 100644
--- a/src/plugins/nat/in2out_ed.c
+++ b/src/plugins/nat/in2out_ed.c
@@ -1960,11 +1960,8 @@ nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
}
/* Hairpinning */
- if (PREDICT_TRUE (proto0 != SNAT_PROTOCOL_ICMP))
- nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
- s0->ext_host_port, proto0, 1);
- else
- snat_icmp_hairpinning (sm, b0, ip0, icmp0, 1);
+ nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
+ s0->ext_host_port, proto0, 1);
/* Accounting */
nat44_session_update_counters (s0, now,
diff --git a/src/plugins/nat/nat44_hairpinning.c b/src/plugins/nat/nat44_hairpinning.c
index c07427d6bcb..09ea419e637 100644
--- a/src/plugins/nat/nat44_hairpinning.c
+++ b/src/plugins/nat/nat44_hairpinning.c
@@ -286,39 +286,6 @@ snat_icmp_hairpinning (snat_main_t * sm,
}
else
{
- if (!is_ed)
- {
- icmp_echo_header_t *echo0 = (icmp_echo_header_t *) (icmp0 + 1);
- u16 icmp_id0 = echo0->identifier;
- key0.addr = ip0->dst_address;
- key0.port = icmp_id0;
- key0.protocol = SNAT_PROTOCOL_ICMP;
- key0.fib_index = sm->outside_fib_index;
- kv0.key = key0.as_u64;
- if (sm->num_workers > 1)
- ti =
- (clib_net_to_host_u16 (icmp_id0) - 1024) / sm->port_per_thread;
- else
- ti = sm->num_workers;
- int rv =
- clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
- &value0);
- if (!rv)
- {
- si = value0.value;
- s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
- new_dst_addr0 = s0->in2out.addr.as_u32;
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
- echo0->identifier = s0->in2out.port;
- sum0 = icmp0->checksum;
- sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
- icmp_echo_header_t, identifier);
- icmp0->checksum = ip_csum_fold (sum0);
- goto change_addr;
- }
- ti = 0;
- }
-
key0.addr = ip0->dst_address;
key0.port = 0;
key0.protocol = 0;
@@ -327,7 +294,44 @@ snat_icmp_hairpinning (snat_main_t * sm,
if (clib_bihash_search_8_8
(&sm->static_mapping_by_external, &kv0, &value0))
- return 1;
+ {
+ if (!is_ed)
+ {
+ icmp_echo_header_t *echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+ u16 icmp_id0 = echo0->identifier;
+ key0.addr = ip0->dst_address;
+ key0.port = icmp_id0;
+ key0.protocol = SNAT_PROTOCOL_ICMP;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+ if (sm->num_workers > 1)
+ ti =
+ (clib_net_to_host_u16 (icmp_id0) -
+ 1024) / sm->port_per_thread;
+ else
+ ti = sm->num_workers;
+ int rv =
+ clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
+ &value0);
+ if (!rv)
+ {
+ si = value0.value;
+ s0 =
+ pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] =
+ s0->in2out.fib_index;
+ echo0->identifier = s0->in2out.port;
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
+ icmp_echo_header_t, identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ goto change_addr;
+ }
+ }
+
+ return 1;
+ }
m0 = pool_elt_at_index (sm->static_mappings, value0.value);
diff --git a/src/plugins/nat/out2in.c b/src/plugins/nat/out2in.c
index eeecf165264..c4d1fbf6900 100755
--- a/src/plugins/nat/out2in.c
+++ b/src/plugins/nat/out2in.c
@@ -775,17 +775,17 @@ snat_out2in_node_fn (vlib_main_t * vm,
goto trace0;
}
- if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ if (PREDICT_FALSE (ip4_is_fragment (ip0)))
{
- next0 = icmp_out2in_slow_path
- (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
- next0, now, thread_index, &s0);
+ next0 = SNAT_OUT2IN_NEXT_REASS;
goto trace0;
}
- if (PREDICT_FALSE (ip4_is_fragment (ip0)))
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
- next0 = SNAT_OUT2IN_NEXT_REASS;
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
goto trace0;
}
@@ -936,17 +936,17 @@ snat_out2in_node_fn (vlib_main_t * vm,
goto trace1;
}
- if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ if (PREDICT_FALSE (ip4_is_fragment (ip1)))
{
- next1 = icmp_out2in_slow_path
- (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
- next1, now, thread_index, &s1);
+ next1 = SNAT_OUT2IN_NEXT_REASS;
goto trace1;
}
- if (PREDICT_FALSE (ip4_is_fragment (ip1)))
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
{
- next1 = SNAT_OUT2IN_NEXT_REASS;
+ next1 = icmp_out2in_slow_path
+ (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
+ next1, now, thread_index, &s1);
goto trace1;
}
@@ -1134,17 +1134,17 @@ snat_out2in_node_fn (vlib_main_t * vm,
goto trace00;
}
- if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ if (PREDICT_FALSE (ip4_is_fragment (ip0)))
{
- next0 = icmp_out2in_slow_path
- (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
- next0, now, thread_index, &s0);
+ next0 = SNAT_OUT2IN_NEXT_REASS;
goto trace00;
}
- if (PREDICT_FALSE (ip4_is_fragment (ip0)))
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
- next0 = SNAT_OUT2IN_NEXT_REASS;
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
goto trace00;
}
@@ -1336,6 +1336,7 @@ nat44_out2in_reass_node_fn (vlib_main_t * vm,
nat_reass_ip4_t *reass0;
udp_header_t *udp0;
tcp_header_t *tcp0;
+ icmp46_header_t *icmp0;
snat_session_key_t key0, sm0;
clib_bihash_kv_8_8_t kv0, value0;
snat_session_t *s0 = 0;
@@ -1369,6 +1370,7 @@ nat44_out2in_reass_node_fn (vlib_main_t * vm,
ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
proto0 = ip_proto_to_snat_proto (ip0->protocol);
reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
@@ -1387,6 +1389,26 @@ nat44_out2in_reass_node_fn (vlib_main_t * vm,
if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
{
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+
+ if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP))
+ {
+ if (s0)
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ else
+ reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
+ reass0->thread_index = thread_index;
+ nat_ip4_reass_get_frags (reass0,
+ &fragments_to_loopback);
+ }
+
+ goto trace0;
+ }
+
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
diff --git a/test/test_nat.py b/test/test_nat.py
index e9e7dfa3068..e26aa27ddbd 100644
--- a/test/test_nat.py
+++ b/test/test_nat.py
@@ -3335,86 +3335,36 @@ class TestNAT44(MethodHolder):
self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
is_inside=0)
- data = "A" * 4 + "B" * 16 + "C" * 3
- self.tcp_port_in = random.randint(1025, 65535)
-
- reass = self.vapi.nat_reass_dump()
- reass_n_start = len(reass)
-
- # in2out
- pkts = self.create_stream_frag(self.pg0,
- self.pg1.remote_ip4,
- self.tcp_port_in,
- 20,
- data)
- self.pg0.add_stream(pkts)
- self.pg_enable_capture(self.pg_interfaces)
- self.pg_start()
- frags = self.pg1.get_capture(len(pkts))
- p = self.reass_frags_and_verify(frags,
- self.nat_addr,
- self.pg1.remote_ip4)
- self.assertEqual(p[TCP].dport, 20)
- self.assertNotEqual(p[TCP].sport, self.tcp_port_in)
- self.tcp_port_out = p[TCP].sport
- self.assertEqual(data, p[Raw].load)
-
- # out2in
- pkts = self.create_stream_frag(self.pg1,
- self.nat_addr,
- 20,
- self.tcp_port_out,
- data)
- self.pg1.add_stream(pkts)
- self.pg_enable_capture(self.pg_interfaces)
- self.pg_start()
- frags = self.pg0.get_capture(len(pkts))
- p = self.reass_frags_and_verify(frags,
- self.pg1.remote_ip4,
- self.pg0.remote_ip4)
- self.assertEqual(p[TCP].sport, 20)
- self.assertEqual(p[TCP].dport, self.tcp_port_in)
- self.assertEqual(data, p[Raw].load)
-
- reass = self.vapi.nat_reass_dump()
- reass_n_end = len(reass)
-
- self.assertEqual(reass_n_end - reass_n_start, 2)
+ self.frag_in_order(proto=IP_PROTOS.tcp)
+ self.frag_in_order(proto=IP_PROTOS.udp)
+ self.frag_in_order(proto=IP_PROTOS.icmp)
def test_reass_hairpinning(self):
""" NAT44 fragments hairpinning """
- server = self.pg0.remote_hosts[1]
- host_in_port = random.randint(1025, 65535)
- server_in_port = random.randint(1025, 65535)
- server_out_port = random.randint(1025, 65535)
- data = "A" * 4 + "B" * 16 + "C" * 3
+ self.server = self.pg0.remote_hosts[1]
+ self.host_in_port = random.randint(1025, 65535)
+ self.server_in_port = random.randint(1025, 65535)
+ self.server_out_port = random.randint(1025, 65535)
self.nat44_add_address(self.nat_addr)
self.vapi.nat44_interface_add_del_feature(self.pg0.sw_if_index)
self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
is_inside=0)
# add static mapping for server
- self.nat44_add_static_mapping(server.ip4, self.nat_addr,
- server_in_port, server_out_port,
+ self.nat44_add_static_mapping(self.server.ip4, self.nat_addr,
+ self.server_in_port,
+ self.server_out_port,
proto=IP_PROTOS.tcp)
+ self.nat44_add_static_mapping(self.server.ip4, self.nat_addr,
+ self.server_in_port,
+ self.server_out_port,
+ proto=IP_PROTOS.udp)
+ self.nat44_add_static_mapping(self.server.ip4, self.nat_addr)
- # send packet from host to server
- pkts = self.create_stream_frag(self.pg0,
- self.nat_addr,
- host_in_port,
- server_out_port,
- data)
- self.pg0.add_stream(pkts)
- self.pg_enable_capture(self.pg_interfaces)
- self.pg_start()
- frags = self.pg0.get_capture(len(pkts))
- p = self.reass_frags_and_verify(frags,
- self.nat_addr,
- server.ip4)
- self.assertNotEqual(p[TCP].sport, host_in_port)
- self.assertEqual(p[TCP].dport, server_in_port)
- self.assertEqual(data, p[Raw].load)
+ self.reass_hairpinning(proto=IP_PROTOS.tcp)
+ self.reass_hairpinning(proto=IP_PROTOS.udp)
+ self.reass_hairpinning(proto=IP_PROTOS.icmp)
def test_frag_out_of_order(self):
""" NAT44 translate fragments arriving out of order """
@@ -3424,45 +3374,9 @@ class TestNAT44(MethodHolder):
self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
is_inside=0)
- data = "A" * 4 + "B" * 16 + "C" * 3
- random.randint(1025, 65535)
-
- # in2out
- pkts = self.create_stream_frag(self.pg0,
- self.pg1.remote_ip4,
- self.tcp_port_in,
- 20,
- data)
- pkts.reverse()
- self.pg0.add_stream(pkts)
- self.pg_enable_capture(self.pg_interfaces)
- self.pg_start()
- frags = self.pg1.get_capture(len(pkts))
- p = self.reass_frags_and_verify(frags,
- self.nat_addr,
- self.pg1.remote_ip4)
- self.assertEqual(p[TCP].dport, 20)
- self.assertNotEqual(p[TCP].sport, self.tcp_port_in)
- self.tcp_port_out = p[TCP].sport
- self.assertEqual(data, p[Raw].load)
-
- # out2in
- pkts = self.create_stream_frag(self.pg1,
- self.nat_addr,
- 20,
- self.tcp_port_out,
- data)
- pkts.reverse()
- self.pg1.add_stream(pkts)
- self.pg_enable_capture(self.pg_interfaces)
- self.pg_start()
- frags = self.pg0.get_capture(len(pkts))
- p = self.reass_frags_and_verify(frags,
- self.pg1.remote_ip4,
- self.pg0.remote_ip4)
- self.assertEqual(p[TCP].sport, 20)
- self.assertEqual(p[TCP].dport, self.tcp_port_in)
- self.assertEqual(data, p[Raw].load)
+ self.frag_out_of_order(proto=IP_PROTOS.tcp)
+ self.frag_out_of_order(proto=IP_PROTOS.udp)
+ self.frag_out_of_order(proto=IP_PROTOS.icmp)
def test_port_restricted(self):
""" Port restricted NAT44 (MAP-E CE) """
@@ -3971,8 +3885,7 @@ class TestNAT44EndpointDependent(MethodHolder):
self.server_in_port,
self.server_out_port,
proto=IP_PROTOS.udp)
- self.nat44_add_static_mapping(self.server.ip4, self.nat_addr,
- proto=IP_PROTOS.icmp)
+ self.nat44_add_static_mapping(self.server.ip4, self.nat_addr)
self.reass_hairpinning(proto=IP_PROTOS.tcp)
self.reass_hairpinning(proto=IP_PROTOS.udp)