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authorMatus Fabian <matfabia@cisco.com>2018-08-23 00:33:35 -0700
committerOle Trøan <otroan@employees.org>2018-08-27 12:17:25 +0000
commit878c646aea9b9ccf68011ffd964694c43bbe5fdd (patch)
tree4acfaf8c3e35e2c2e334ae8495fdd52c49b5a791 /src/plugins/nat/in2out.c
parentd2dcd200fe2e94f6408155f6c38e7f570dbe1183 (diff)
NAT44: add support for session timeout (VPP-1272)
NAT44 (vanilla/simple and endpoint-dependent mode) now lazily delete expired sessions. When inserting to session lookup hash and bucket is full, expired session is overwritten. Change-Id: Ib1b34959f60f0ca4f5b13525b1d41dd2f992288d Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/in2out.c')
-rwxr-xr-xsrc/plugins/nat/in2out.c217
1 files changed, 184 insertions, 33 deletions
diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
index ac0490f36e9..9c8b2c6c5e5 100755
--- a/src/plugins/nat/in2out.c
+++ b/src/plugins/nat/in2out.c
@@ -311,6 +311,43 @@ nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0,
return 0;
}
+int
+nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void * arg)
+{
+ snat_main_t *sm = &snat_main;
+ nat44_is_idle_session_ctx_t *ctx = arg;
+ snat_session_t *s;
+ u64 sess_timeout_time;
+ snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
+ ctx->thread_index);
+ clib_bihash_kv_8_8_t s_kv;
+
+ s = pool_elt_at_index (tsm->sessions, kv->value);
+ sess_timeout_time = s->last_heard + (f64)nat44_session_get_timeout(sm, s);
+ if (ctx->now >= sess_timeout_time)
+ {
+ s_kv.key = s->out2in.as_u64;
+ if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0))
+ nat_log_warn ("out2in key del failed");
+
+ snat_ipfix_logging_nat44_ses_delete(s->in2out.addr.as_u32,
+ s->out2in.addr.as_u32,
+ s->in2out.protocol,
+ s->in2out.port,
+ s->out2in.port,
+ s->in2out.fib_index);
+
+ if (!snat_is_session_static (s))
+ snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
+ &s->out2in);
+
+ nat44_delete_session (sm, s, ctx->thread_index);
+ return 1;
+ }
+
+ return 0;
+}
+
static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
ip4_header_t * ip0,
u32 rx_fib_index0,
@@ -318,7 +355,8 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
snat_session_t ** sessionp,
vlib_node_runtime_t * node,
u32 next0,
- u32 thread_index)
+ u32 thread_index,
+ f64 now)
{
snat_user_t *u;
snat_session_t *s;
@@ -336,6 +374,7 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
.ip4.as_u32 = ip0->dst_address.as_u32,
},
};
+ nat44_is_idle_session_ctx_t ctx0;
if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
{
@@ -416,17 +455,21 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
*sessionp = s;
/* Add to translation hashes */
+ ctx0.now = now;
+ ctx0.thread_index = thread_index;
kv0.key = s->in2out.as_u64;
kv0.value = s - sm->per_thread_data[thread_index].sessions;
- if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0,
- 1 /* is_add */))
+ if (clib_bihash_add_or_overwrite_stale_8_8 (
+ &sm->per_thread_data[thread_index].in2out, &kv0,
+ nat44_i2o_is_idle_session_cb, &ctx0))
nat_log_notice ("in2out key add failed");
kv0.key = s->out2in.as_u64;
kv0.value = s - sm->per_thread_data[thread_index].sessions;
- if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
- 1 /* is_add */))
+ if (clib_bihash_add_or_overwrite_stale_8_8 (
+ &sm->per_thread_data[thread_index].out2in, &kv0,
+ nat44_o2i_is_idle_session_cb, &ctx0))
nat_log_notice ("out2in key add failed");
/* log NAT event */
@@ -558,8 +601,8 @@ u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node,
goto out;
}
- next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
- &s0, node, next0, thread_index);
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0,
+ thread_index, vlib_time_now (sm->vlib_main));
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto out;
@@ -1252,7 +1295,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
}
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
- &s0, node, next0, thread_index);
+ &s0, node, next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace00;
}
@@ -1412,7 +1455,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
}
next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
- &s1, node, next1, thread_index);
+ &s1, node, next1, thread_index, now);
if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
goto trace01;
}
@@ -1608,7 +1651,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
}
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
- &s0, node, next0, thread_index);
+ &s0, node, next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace0;
@@ -2156,7 +2199,7 @@ nat44_in2out_reass_node_fn (vlib_main_t * vm,
goto trace0;
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
- &s0, node, next0, thread_index);
+ &s0, node, next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace0;
@@ -2374,6 +2417,110 @@ icmp_get_ed_key(ip4_header_t *ip0, nat_ed_ses_key_t *p_key0)
return 0;
}
+int
+nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void * arg)
+{
+ snat_main_t *sm = &snat_main;
+ nat44_is_idle_session_ctx_t *ctx = arg;
+ snat_session_t *s;
+ u64 sess_timeout_time;
+ nat_ed_ses_key_t ed_key;
+ clib_bihash_kv_16_8_t ed_kv;
+ int i;
+ snat_address_t *a;
+ snat_session_key_t key;
+ snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
+ ctx->thread_index);
+
+ s = pool_elt_at_index (tsm->sessions, kv->value);
+ sess_timeout_time = s->last_heard + (f64)nat44_session_get_timeout(sm, s);
+ if (ctx->now >= sess_timeout_time)
+ {
+ if (is_fwd_bypass_session (s))
+ goto delete;
+
+ ed_key.l_addr = s->out2in.addr;
+ ed_key.r_addr = s->ext_host_addr;
+ ed_key.fib_index = s->out2in.fib_index;
+ if (snat_is_unk_proto_session (s))
+ {
+ ed_key.proto = s->in2out.port;
+ ed_key.r_port = 0;
+ ed_key.l_port = 0;
+ }
+ else
+ {
+ ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
+ ed_key.l_port = s->out2in.port;
+ ed_key.r_port = s->ext_host_port;
+ }
+ ed_kv.key[0] = ed_key.as_u64[0];
+ ed_kv.key[1] = ed_key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
+ nat_log_warn ("out2in_ed key del failed");
+
+ if (snat_is_unk_proto_session (s))
+ goto delete;
+
+ snat_ipfix_logging_nat44_ses_delete(s->in2out.addr.as_u32,
+ s->out2in.addr.as_u32,
+ s->in2out.protocol,
+ s->in2out.port,
+ s->out2in.port,
+ s->in2out.fib_index);
+
+ if (is_twice_nat_session (s))
+ {
+ for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
+ {
+ key.protocol = s->in2out.protocol;
+ key.port = s->ext_host_nat_port;
+ a = sm->twice_nat_addresses + i;
+ if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
+ {
+ snat_free_outside_address_and_port (sm->twice_nat_addresses,
+ ctx->thread_index, &key);
+ break;
+ }
+ }
+ }
+
+ if (snat_is_session_static (s))
+ goto delete;
+
+ if (s->outside_address_index != ~0)
+ snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
+ &s->out2in);
+ delete:
+ nat44_delete_session (sm, s, ctx->thread_index);
+ return 1;
+ }
+
+ return 0;
+}
+
+static inline u32
+icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
+ ip4_header_t * ip0, icmp46_header_t * icmp0,
+ u32 sw_if_index0, u32 rx_fib_index0,
+ vlib_node_runtime_t * node, u32 next0, f64 now,
+ u32 thread_index, snat_session_t ** p_s0)
+{
+ next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, thread_index, p_s0, 0);
+ snat_session_t * s0 = *p_s0;
+ if (PREDICT_TRUE(next0 != SNAT_IN2OUT_NEXT_DROP && s0))
+ {
+ /* Hairpinning */
+ if (vnet_buffer(b0)->sw_if_index[VLIB_TX] == ~0)
+ snat_icmp_hairpinning(sm, b0, ip0, icmp0, sm->endpoint_dependent);
+ /* Accounting */
+ nat44_session_update_counters (s0, now,
+ vlib_buffer_length_in_chain (sm->vlib_main, b0));
+ }
+ return next0;
+}
+
static u32
slow_path_ed (snat_main_t *sm,
vlib_buffer_t *b,
@@ -2382,7 +2529,8 @@ slow_path_ed (snat_main_t *sm,
snat_session_t ** sessionp,
vlib_node_runtime_t * node,
u32 next,
- u32 thread_index)
+ u32 thread_index,
+ f64 now)
{
snat_session_t *s;
snat_user_t *u;
@@ -2401,6 +2549,7 @@ slow_path_ed (snat_main_t *sm,
.ip4.as_u32 = key->r_addr.as_u32,
},
};
+ nat44_is_idle_session_ctx_t ctx;
if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
{
@@ -2437,14 +2586,20 @@ slow_path_ed (snat_main_t *sm,
if (!u)
{
nat_log_warn ("create NAT user failed");
+ if (!is_sm)
+ snat_free_outside_address_and_port (sm->addresses,
+ thread_index, &key1);
return SNAT_IN2OUT_NEXT_DROP;
}
- s = nat_session_alloc_or_recycle (sm, u, thread_index);
+ s = nat_ed_session_alloc (sm, u, thread_index);
if (!s)
{
nat44_delete_user_with_no_session (sm, u, thread_index);
nat_log_warn ("create NAT session failed");
+ if (!is_sm)
+ snat_free_outside_address_and_port (sm->addresses,
+ thread_index, &key1);
return SNAT_IN2OUT_NEXT_DROP;
}
@@ -2487,13 +2642,19 @@ slow_path_ed (snat_main_t *sm,
/* Add to lookup tables */
kv->value = s - tsm->sessions;
- if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, kv, 1))
+ ctx.now = now;
+ ctx.thread_index = thread_index;
+ if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
+ nat44_i2o_ed_is_idle_session_cb,
+ &ctx))
nat_log_notice ("in2out-ed key add failed");
make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
key1.port, key->r_port);
kv->value = s - tsm->sessions;
- if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, kv, 1))
+ if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
+ nat44_o2i_ed_is_idle_session_cb,
+ &ctx))
nat_log_notice ("out2in-ed key add failed");
*sessionp = s;
@@ -2588,8 +2749,6 @@ nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
return 1;
}
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s, thread_index);
/* Accounting */
nat44_session_update_counters (s, now,
vlib_buffer_length_in_chain (vm, b));
@@ -2703,7 +2862,7 @@ icmp_match_in2out_ed(snat_main_t *sm, vlib_node_runtime_t *node,
}
next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
- thread_index);
+ thread_index, vlib_time_now (sm->vlib_main));
if (PREDICT_FALSE (next == SNAT_IN2OUT_NEXT_DROP))
goto out;
@@ -2923,7 +3082,7 @@ nat44_ed_in2out_unknown_proto (snat_main_t *sm,
}
create_ses:
- s = nat_session_alloc_or_recycle (sm, u, thread_index);
+ s = nat_ed_session_alloc (sm, u, thread_index);
if (!s)
{
nat44_delete_user_with_no_session (sm, u, thread_index);
@@ -2965,8 +3124,6 @@ create_ses:
/* Accounting */
nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s, thread_index);
/* Hairpinning */
if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
@@ -3088,7 +3245,7 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
- next0 = icmp_in2out_slow_path
+ next0 = icmp_in2out_ed_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, now, thread_index, &s0);
goto trace00;
@@ -3140,7 +3297,7 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
}
next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
- next0, thread_index);
+ next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace00;
@@ -3211,8 +3368,6 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
/* Accounting */
nat44_session_update_counters (s0, now,
vlib_buffer_length_in_chain (vm, b0));
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s0, thread_index);
trace00:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
@@ -3273,7 +3428,7 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
{
- next1 = icmp_in2out_slow_path
+ next1 = icmp_in2out_ed_slow_path
(sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
next1, now, thread_index, &s1);
goto trace01;
@@ -3325,7 +3480,7 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
}
next1 = slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
- next1, thread_index);
+ next1, thread_index, now);
if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
goto trace01;
@@ -3396,8 +3551,6 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
/* Accounting */
nat44_session_update_counters (s1, now,
vlib_buffer_length_in_chain (vm, b1));
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s1, thread_index);
trace01:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
@@ -3487,7 +3640,7 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
- next0 = icmp_in2out_slow_path
+ next0 = icmp_in2out_ed_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, now, thread_index, &s0);
goto trace0;
@@ -3539,7 +3692,7 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
}
next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
- next0, thread_index);
+ next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace0;
@@ -3610,8 +3763,6 @@ nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
/* Accounting */
nat44_session_update_counters (s0, now,
vlib_buffer_length_in_chain (vm, b0));
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s0, thread_index);
trace0:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)