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authorMatus Fabian <matfabia@cisco.com>2017-09-22 02:43:05 -0700
committerOle Trøan <otroan@employees.org>2017-09-25 07:01:57 +0000
commit41fef50d5db5e7deb3cfd901c3108abbc4406813 (patch)
tree3618d4a8ce87f9b89cedff3624d28b1118a1c218 /src/plugins/nat/out2in.c
parentba3c4e88c102afd601fbac0e02de73a28a279a73 (diff)
NAT: session number limitation to avoid running out of memory crash (VPP-984)
Change-Id: I7f18f8c4ba609d96950dc1f833feb967d4a099b7 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/out2in.c')
-rwxr-xr-xsrc/plugins/nat/out2in.c77
1 files changed, 56 insertions, 21 deletions
diff --git a/src/plugins/nat/out2in.c b/src/plugins/nat/out2in.c
index 6472e7ff50c..e5426c1a80e 100755
--- a/src/plugins/nat/out2in.c
+++ b/src/plugins/nat/out2in.c
@@ -87,7 +87,8 @@ vlib_node_registration_t snat_det_out2in_node;
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
_(OUT2IN_PACKETS, "Good out2in packets processed") \
_(BAD_ICMP_TYPE, "unsupported ICMP type") \
-_(NO_TRANSLATION, "No translation")
+_(NO_TRANSLATION, "No translation") \
+_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded")
typedef enum {
#define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
@@ -139,6 +140,12 @@ create_session_for_static_mapping (snat_main_t *sm,
dlist_elt_t * per_user_list_head_elt;
ip4_header_t *ip0;
+ if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED];
+ return 0;
+ }
+
ip0 = vlib_buffer_get_current (b0);
user_key.addr = in2out.addr;
@@ -620,14 +627,15 @@ static inline u32 icmp_out2in_slow_path (snat_main_t *sm,
return next0;
}
-static void
+static snat_session_t *
snat_out2in_unknown_proto (snat_main_t *sm,
vlib_buffer_t * b,
ip4_header_t * ip,
u32 rx_fib_index,
u32 thread_index,
f64 now,
- vlib_main_t * vm)
+ vlib_main_t * vm,
+ vlib_node_runtime_t * node)
{
clib_bihash_kv_8_8_t kv, value;
clib_bihash_kv_16_8_t s_kv, s_value;
@@ -660,13 +668,22 @@ snat_out2in_unknown_proto (snat_main_t *sm,
}
else
{
+ if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
+ {
+ b->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED];
+ return 0;
+ }
+
m_key.addr = ip->dst_address;
m_key.port = 0;
m_key.protocol = 0;
m_key.fib_index = rx_fib_index;
kv.key = m_key.as_u64;
if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
- return;
+ {
+ b->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ return 0;
+ }
m = pool_elt_at_index (sm->static_mappings, value.value);
@@ -753,6 +770,8 @@ snat_out2in_unknown_proto (snat_main_t *sm,
clib_dlist_remove (tsm->list_pool, s->per_user_index);
clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index,
s->per_user_index);
+
+ return s;
}
static snat_session_t *
@@ -762,7 +781,8 @@ snat_out2in_lb (snat_main_t *sm,
u32 rx_fib_index,
u32 thread_index,
f64 now,
- vlib_main_t * vm)
+ vlib_main_t * vm,
+ vlib_node_runtime_t * node)
{
nat_ed_ses_key_t key;
clib_bihash_kv_16_8_t s_kv, s_value;
@@ -797,6 +817,12 @@ snat_out2in_lb (snat_main_t *sm,
}
else
{
+ if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
+ {
+ b->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED];
+ return 0;
+ }
+
e_key.addr = ip->dst_address;
e_key.port = udp->dst_port;
e_key.protocol = proto;
@@ -998,8 +1024,10 @@ snat_out2in_node_fn (vlib_main_t * vm,
if (PREDICT_FALSE (proto0 == ~0))
{
- snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0,
- thread_index, now, vm);
+ s0 = snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0,
+ thread_index, now, vm, node);
+ if (!s0)
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace0;
}
@@ -1042,7 +1070,6 @@ snat_out2in_node_fn (vlib_main_t * vm,
thread_index);
if (!s0)
{
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace0;
}
@@ -1051,8 +1078,10 @@ snat_out2in_node_fn (vlib_main_t * vm,
{
if (PREDICT_FALSE (value0.value == ~0ULL))
{
- s0 = snat_out2in_lb(sm, b0, ip0, rx_fib_index0, thread_index, now,
- vm);
+ s0 = snat_out2in_lb(sm, b0, ip0, rx_fib_index0, thread_index,
+ now, vm, node);
+ if (!s0)
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace0;
}
else
@@ -1150,8 +1179,10 @@ snat_out2in_node_fn (vlib_main_t * vm,
if (PREDICT_FALSE (proto1 == ~0))
{
- snat_out2in_unknown_proto(sm, b1, ip1, rx_fib_index1,
- thread_index, now, vm);
+ s1 = snat_out2in_unknown_proto(sm, b1, ip1, rx_fib_index1,
+ thread_index, now, vm, node);
+ if (!s1)
+ next1 = SNAT_OUT2IN_NEXT_DROP;
goto trace1;
}
@@ -1194,7 +1225,6 @@ snat_out2in_node_fn (vlib_main_t * vm,
thread_index);
if (!s1)
{
- b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
next1 = SNAT_OUT2IN_NEXT_DROP;
goto trace1;
}
@@ -1203,8 +1233,10 @@ snat_out2in_node_fn (vlib_main_t * vm,
{
if (PREDICT_FALSE (value1.value == ~0ULL))
{
- s1 = snat_out2in_lb(sm, b1, ip1, rx_fib_index1, thread_index, now,
- vm);
+ s1 = snat_out2in_lb(sm, b1, ip1, rx_fib_index1, thread_index,
+ now, vm, node);
+ if (!s1)
+ next1 = SNAT_OUT2IN_NEXT_DROP;
goto trace1;
}
else
@@ -1328,8 +1360,10 @@ snat_out2in_node_fn (vlib_main_t * vm,
if (PREDICT_FALSE (proto0 == ~0))
{
- snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0,
- thread_index, now, vm);
+ s0 = snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0,
+ thread_index, now, vm, node);
+ if (!s0)
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace00;
}
@@ -1383,8 +1417,7 @@ snat_out2in_node_fn (vlib_main_t * vm,
thread_index);
if (!s0)
{
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- next0 = SNAT_OUT2IN_NEXT_DROP;
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace00;
}
}
@@ -1392,8 +1425,10 @@ snat_out2in_node_fn (vlib_main_t * vm,
{
if (PREDICT_FALSE (value0.value == ~0ULL))
{
- s0 = snat_out2in_lb(sm, b0, ip0, rx_fib_index0, thread_index, now,
- vm);
+ s0 = snat_out2in_lb(sm, b0, ip0, rx_fib_index0, thread_index,
+ now, vm, node);
+ if (!s0)
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace00;
}
else