summaryrefslogtreecommitdiffstats
path: root/plugins/snat-plugin/snat/out2in.c
diff options
context:
space:
mode:
authorMatus Fabian <matfabia@cisco.com>2016-08-26 05:45:27 -0700
committerOle Trøan <otroan@employees.org>2016-10-05 11:41:51 +0000
commitdb6498848126839010eaad0bc79571a9ccbfc1bc (patch)
treeed1ad922173bc6187bc7da77b8596f7164272ed2 /plugins/snat-plugin/snat/out2in.c
parentb8602b595fc89fe8b8fb00cef4820eedf225a93e (diff)
VPP-339: SNAT static mapping
1:1 NAT 1:1 NAT with ports 1:1 NAT static mapping only - add "static mapping only [connection tracking]" to snat startup config Change-Id: I37cd06a9d71d1943eb6618034d7c547c4a9348c4 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'plugins/snat-plugin/snat/out2in.c')
-rw-r--r--plugins/snat-plugin/snat/out2in.c510
1 files changed, 468 insertions, 42 deletions
diff --git a/plugins/snat-plugin/snat/out2in.c b/plugins/snat-plugin/snat/out2in.c
index 861dae63b0a..b3497c40d31 100644
--- a/plugins/snat-plugin/snat/out2in.c
+++ b/plugins/snat-plugin/snat/out2in.c
@@ -25,8 +25,6 @@
#include <vppinfra/error.h>
#include <vppinfra/elog.h>
-vlib_node_registration_t snat_out2in_node;
-
typedef struct {
u32 sw_if_index;
u32 next_index;
@@ -45,7 +43,20 @@ static u8 * format_snat_out2in_trace (u8 * s, va_list * args)
return s;
}
+static u8 * format_snat_out2in_fast_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ snat_out2in_trace_t * t = va_arg (*args, snat_out2in_trace_t *);
+
+ s = format (s, "SNAT_OUT2IN_FAST: sw_if_index %d, next index %d",
+ t->sw_if_index, t->next_index);
+ return s;
+}
+
+
vlib_node_registration_t snat_out2in_node;
+vlib_node_registration_t snat_out2in_fast_node;
#define foreach_snat_out2in_error \
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
@@ -71,6 +82,101 @@ typedef enum {
SNAT_OUT2IN_N_NEXT,
} snat_out2in_next_t;
+/**
+ * @brief Create session for static mapping.
+ *
+ * Create NAT session initiated by host from external network with static
+ * mapping.
+ *
+ * @param sm SNAT main.
+ * @param b0 Vlib buffer.
+ * @param in2out In2out SNAT session key.
+ * @param out2in Out2in SNAT session key.
+ * @param node Vlib node.
+ *
+ * @returns SNAT session if successfully created otherwise 0.
+ */
+static inline snat_session_t *
+create_session_for_static_mapping (snat_main_t *sm,
+ vlib_buffer_t *b0,
+ snat_session_key_t in2out,
+ snat_session_key_t out2in,
+ vlib_node_runtime_t * node)
+{
+ snat_user_t *u;
+ snat_user_key_t user_key;
+ snat_session_t *s;
+ clib_bihash_kv_8_8_t kv0, value0;
+ dlist_elt_t * per_user_translation_list_elt;
+ dlist_elt_t * per_user_list_head_elt;
+
+ user_key.addr = in2out.addr;
+ user_key.fib_index = in2out.fib_index;
+ kv0.key = user_key.as_u64;
+
+ /* Ever heard of the "user" = inside ip4 address before? */
+ if (clib_bihash_search_8_8 (&sm->user_hash, &kv0, &value0))
+ {
+ /* no, make a new one */
+ pool_get (sm->users, u);
+ memset (u, 0, sizeof (*u));
+ u->addr = in2out.addr;
+
+ pool_get (sm->list_pool, per_user_list_head_elt);
+
+ u->sessions_per_user_list_head_index = per_user_list_head_elt -
+ sm->list_pool;
+
+ clib_dlist_init (sm->list_pool, u->sessions_per_user_list_head_index);
+
+ kv0.value = u - sm->users;
+
+ /* add user */
+ clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */);
+ }
+ else
+ {
+ u = pool_elt_at_index (sm->users, value0.value);
+ }
+
+ pool_get (sm->sessions, s);
+ memset (s, 0, sizeof (*s));
+
+ s->outside_address_index = ~0;
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ u->nstaticsessions++;
+
+ /* Create list elts */
+ pool_get (sm->list_pool, per_user_translation_list_elt);
+ clib_dlist_init (sm->list_pool, per_user_translation_list_elt -
+ sm->list_pool);
+
+ per_user_translation_list_elt->value = s - sm->sessions;
+ s->per_user_index = per_user_translation_list_elt - sm->list_pool;
+ s->per_user_list_head_index = u->sessions_per_user_list_head_index;
+
+ clib_dlist_addtail (sm->list_pool, s->per_user_list_head_index,
+ per_user_translation_list_elt - sm->list_pool);
+
+ s->in2out = in2out;
+ s->out2in = out2in;
+ s->in2out.protocol = out2in.protocol;
+
+ /* Add to translation hashes */
+ kv0.key = s->in2out.as_u64;
+ kv0.value = s - sm->sessions;
+ if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 1 /* is_add */))
+ clib_warning ("in2out key add failed");
+
+ kv0.key = s->out2in.as_u64;
+ kv0.value = s - sm->sessions;
+
+ if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */))
+ clib_warning ("out2in key add failed");
+
+ return s;
+}
+
static inline u32 icmp_out2in_slow_path (snat_main_t *sm,
vlib_buffer_t * b0,
ip4_header_t * ip0,
@@ -80,7 +186,7 @@ static inline u32 icmp_out2in_slow_path (snat_main_t *sm,
vlib_node_runtime_t * node,
u32 next0, f64 now)
{
- snat_session_key_t key0;
+ snat_session_key_t key0, sm0;
icmp_echo_header_t *echo0;
clib_bihash_kv_8_8_t kv0, value0;
snat_session_t * s0;
@@ -100,24 +206,35 @@ static inline u32 icmp_out2in_slow_path (snat_main_t *sm,
if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match(sm, key0, &sm0, 1))
{
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index0,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index0;
- rt->cached_ip4_address = first_int_addr->as_u32;
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ return next0;
+
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ return SNAT_OUT2IN_NEXT_DROP;
}
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
- rt->cached_ip4_address))
- return next0;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- return SNAT_OUT2IN_NEXT_DROP;
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping(sm, b0, sm0, key0,
+ node);
+ if (!s0)
+ return SNAT_OUT2IN_NEXT_DROP;
}
else
s0 = pool_elt_at_index (sm->sessions, value0.value);
@@ -142,13 +259,17 @@ static inline u32 icmp_out2in_slow_path (snat_main_t *sm,
identifier);
icmp0->checksum = ip_csum_fold (sum0);
- /* Accounting, per-user LRU list maintenance */
+ /* Accounting */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0);
- clib_dlist_remove (sm->list_pool, s0->per_user_index);
- clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
- s0->per_user_index);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
return next0;
}
@@ -193,7 +314,7 @@ snat_out2in_node_fn (vlib_main_t * vm,
udp_header_t * udp0, * udp1;
tcp_header_t * tcp0, * tcp1;
icmp46_header_t * icmp0, * icmp1;
- snat_session_key_t key0, key1;
+ snat_session_key_t key0, key1, sm0, sm1;
u32 rx_fib_index0, rx_fib_index1;
u32 proto0, proto1;
snat_session_t * s0 = 0, * s1 = 0;
@@ -264,14 +385,27 @@ snat_out2in_node_fn (vlib_main_t * vm,
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
- goto trace0;
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match(sm, key0, &sm0, 1))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node);
+ if (!s0)
+ goto trace0;
+ }
else
s0 = pool_elt_at_index (sm->sessions, value0.value);
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;
new_addr0 = ip0->dst_address.as_u32;
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
@@ -302,13 +436,17 @@ snat_out2in_node_fn (vlib_main_t * vm,
udp0->checksum = 0;
}
- /* Accounting, per-user LRU list maintenance */
+ /* Accounting */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
- clib_dlist_remove (sm->list_pool, s0->per_user_index);
- clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
- s0->per_user_index);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
trace0:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
@@ -366,14 +504,27 @@ snat_out2in_node_fn (vlib_main_t * vm,
kv1.key = key1.as_u64;
if (clib_bihash_search_8_8 (&sm->out2in, &kv1, &value1))
- goto trace1;
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match(sm, key1, &sm1, 1))
+ {
+ b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace1;
+ }
+
+ /* Create session initiated by host from external network */
+ s1 = create_session_for_static_mapping(sm, b1, sm1, key1, node);
+ if (!s1)
+ goto trace1;
+ }
else
s1 = pool_elt_at_index (sm->sessions, value1.value);
old_addr1 = ip1->dst_address.as_u32;
ip1->dst_address = s1->in2out.addr;
new_addr1 = ip1->dst_address.as_u32;
- vnet_buffer(b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index;
sum1 = ip1->checksum;
sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
@@ -404,13 +555,17 @@ snat_out2in_node_fn (vlib_main_t * vm,
udp1->checksum = 0;
}
- /* Accounting, per-user LRU list maintenance */
+ /* Accounting */
s1->last_heard = now;
s1->total_pkts++;
s1->total_bytes += vlib_buffer_length_in_chain (vm, b1);
- clib_dlist_remove (sm->list_pool, s1->per_user_index);
- clib_dlist_addtail (sm->list_pool, s1->per_user_list_head_index,
- s1->per_user_index);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s1))
+ {
+ clib_dlist_remove (sm->list_pool, s1->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s1->per_user_list_head_index,
+ s1->per_user_index);
+ }
trace1:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
@@ -447,7 +602,7 @@ snat_out2in_node_fn (vlib_main_t * vm,
udp_header_t * udp0;
tcp_header_t * tcp0;
icmp46_header_t * icmp0;
- snat_session_key_t key0;
+ snat_session_key_t key0, sm0;
u32 rx_fib_index0;
u32 proto0;
snat_session_t * s0 = 0;
@@ -503,14 +658,27 @@ snat_out2in_node_fn (vlib_main_t * vm,
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
- goto trace00;
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match(sm, key0, &sm0, 1))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace00;
+ }
+
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node);
+ if (!s0)
+ goto trace00;
+ }
else
s0 = pool_elt_at_index (sm->sessions, value0.value);
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;
new_addr0 = ip0->dst_address.as_u32;
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
@@ -541,13 +709,17 @@ snat_out2in_node_fn (vlib_main_t * vm,
udp0->checksum = 0;
}
- /* Accounting, per-user LRU list maintenance */
+ /* Accounting */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
- clib_dlist_remove (sm->list_pool, s0->per_user_index);
- clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
- s0->per_user_index);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
trace00:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
@@ -599,3 +771,257 @@ VLIB_REGISTER_NODE (snat_out2in_node) = {
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn);
+
+static inline u32 icmp_out2in_fast (snat_main_t *sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ icmp46_header_t * icmp0,
+ u32 sw_if_index0,
+ vlib_node_runtime_t * node,
+ u32 next0)
+{
+ snat_session_key_t key0, sm0;
+ icmp_echo_header_t *echo0;
+ u32 new_addr0, old_addr0;
+ u16 old_id0, new_id0;
+ ip_csum_t sum0;
+ snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
+
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+
+ key0.addr = ip0->dst_address;
+ key0.port = echo0->identifier;
+
+ if (snat_static_mapping_match(sm, key0, &sm0, 1))
+ {
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ return next0;
+
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ return SNAT_OUT2IN_NEXT_DROP;
+ }
+
+ new_addr0 = sm0.addr.as_u32;
+ new_id0 = sm0.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_addr0;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE(new_id0 != echo0->identifier))
+ {
+ old_id0 = echo0->identifier;
+ echo0->identifier = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
+ identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ }
+
+ return next0;
+}
+
+static uword
+snat_out2in_fast_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_out2in_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ ip_lookup_main_t * lm = sm->ip4_lookup_main;
+ ip_config_main_t * cm = &lm->feature_config_mains[VNET_IP_RX_UNICAST_FEAT];
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0 = SNAT_OUT2IN_NEXT_DROP;
+ u32 sw_if_index0;
+ ip4_header_t * ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 new_port0, old_port0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ icmp46_header_t * icmp0;
+ snat_session_key_t key0, sm0;
+ u32 proto0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+ proto0 = ~0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto0;
+
+ if (PREDICT_FALSE (proto0 == ~0))
+ goto trace00;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_fast
+ (sm, b0, ip0, icmp0, sw_if_index0, node, next0);
+ goto trace00;
+ }
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+
+ if (snat_static_mapping_match(sm, key0, &sm0, 1))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace00;
+ }
+
+ new_addr0 = sm0.addr.as_u32;
+ new_port0 = sm0.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_addr0;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE(new_port0 != udp0->dst_port))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->ports.dst;
+ tcp0->ports.dst = new_port0;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->dst_port;
+ udp0->dst_port = new_port0;
+ udp0->checksum = 0;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ }
+
+ trace00:
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, snat_out2in_fast_node.index,
+ SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_out2in_fast_node) = {
+ .function = snat_out2in_fast_node_fn,
+ .name = "snat-out2in-fast",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_out2in_fast_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_out2in_error_strings),
+ .error_strings = snat_out2in_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_OUT2IN_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
+ },
+};
+VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_fast_node, snat_out2in_fast_node_fn);