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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/in2out.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/in2out.c')
-rw-r--r--plugins/snat-plugin/snat/in2out.c422
1 files changed, 369 insertions, 53 deletions
diff --git a/plugins/snat-plugin/snat/in2out.c b/plugins/snat-plugin/snat/in2out.c
index 3f7df910fe5..25dad934cad 100644
--- a/plugins/snat-plugin/snat/in2out.c
+++ b/plugins/snat-plugin/snat/in2out.c
@@ -25,8 +25,6 @@
#include <vppinfra/error.h>
#include <vppinfra/elog.h>
-vlib_node_registration_t snat_in2out_node, snat_in2out_slowpath_node;
-
typedef struct {
u32 sw_if_index;
u32 next_index;
@@ -50,14 +48,29 @@ static u8 * format_snat_in2out_trace (u8 * s, va_list * args)
return s;
}
+static u8 * format_snat_in2out_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_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *);
+
+ s = format (s, "SANT_IN2OUT_FAST: sw_if_index %d, next index %d",
+ t->sw_if_index, t->next_index);
+
+ return s;
+}
+
vlib_node_registration_t snat_in2out_node;
+vlib_node_registration_t snat_in2out_slowpath_node;
+vlib_node_registration_t snat_in2out_fast_node;
#define foreach_snat_in2out_error \
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
_(IN2OUT_PACKETS, "Good in2out packets processed") \
_(OUT_OF_PORTS, "Out of ports") \
_(BAD_OUTSIDE_FIB, "Outside VRF ID not found") \
-_(BAD_ICMP_TYPE, "icmp type not echo-request")
+_(BAD_ICMP_TYPE, "icmp type not echo-request") \
+_(NO_TRANSLATION, "No translation")
typedef enum {
#define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
@@ -98,7 +111,7 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
dlist_elt_t * per_user_list_head_elt;
u32 session_index;
snat_session_key_t key1;
- u32 address_index;
+ u32 address_index = ~0;
u32 outside_fib_index;
uword * p;
@@ -128,9 +141,9 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
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 */);
}
@@ -139,30 +152,32 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
u = pool_elt_at_index (sm->users, value0.value);
}
- /* Over quota? Recycle the least recently used translation */
+ /* Over quota? Recycle the least recently used dynamic translation */
if (u->nsessions >= sm->max_translations_per_user)
{
- /* Remove the oldest translation */
- oldest_per_user_translation_list_index =
- clib_dlist_remove_head
- (sm->list_pool, u->sessions_per_user_list_head_index);
-
- ASSERT (oldest_per_user_translation_list_index != ~0);
-
- /* add it back to the end of the LRU list */
- clib_dlist_addtail (sm->list_pool, u->sessions_per_user_list_head_index,
- oldest_per_user_translation_list_index);
-
- /* Get the list element */
- oldest_per_user_translation_list_elt =
- pool_elt_at_index (sm->list_pool,
- oldest_per_user_translation_list_index);
-
- /* Get the session index from the list element */
- session_index = oldest_per_user_translation_list_elt->value;
-
- /* Get the session */
- s = pool_elt_at_index (sm->sessions, session_index);
+ /* Remove the oldest dynamic translation */
+ do {
+ oldest_per_user_translation_list_index =
+ clib_dlist_remove_head
+ (sm->list_pool, u->sessions_per_user_list_head_index);
+
+ ASSERT (oldest_per_user_translation_list_index != ~0);
+
+ /* add it back to the end of the LRU list */
+ clib_dlist_addtail (sm->list_pool,
+ u->sessions_per_user_list_head_index,
+ oldest_per_user_translation_list_index);
+ /* Get the list element */
+ oldest_per_user_translation_list_elt =
+ pool_elt_at_index (sm->list_pool,
+ oldest_per_user_translation_list_index);
+
+ /* Get the session index from the list element */
+ session_index = oldest_per_user_translation_list_elt->value;
+
+ /* Get the session */
+ s = pool_elt_at_index (sm->sessions, session_index);
+ } while (!snat_is_session_static (s));
/* Remove in2out, out2in keys */
kv0.key = s->in2out.as_u64;
@@ -187,12 +202,18 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
}
else
{
- if (snat_alloc_outside_address_and_port (sm, &key1, &address_index))
- {
- ASSERT(0);
+ u8 static_mapping = 1;
- b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
- return SNAT_IN2OUT_NEXT_DROP;
+ /* First try to match static mapping by local address and port */
+ if (snat_static_mapping_match (sm, *key0, &key1, 0))
+ {
+ static_mapping = 0;
+ /* Try to create dynamic translation */
+ if (snat_alloc_outside_address_and_port (sm, &key1, &address_index))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
+ return SNAT_IN2OUT_NEXT_DROP;
+ }
}
/* Create a new session */
@@ -201,19 +222,28 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
s->outside_address_index = address_index;
+ if (static_mapping)
+ {
+ u->nstaticsessions++;
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ }
+ else
+ {
+ u->nsessions++;
+ }
+
/* 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);
- u->nsessions++;
- }
+ }
s->in2out = *key0;
s->out2in = key1;
@@ -317,13 +347,17 @@ static inline u32 icmp_in2out_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 translations */
+ 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;
}
@@ -523,13 +557,17 @@ snat_in2out_node_fn_inline (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)
@@ -668,13 +706,17 @@ snat_in2out_node_fn_inline (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);
+ }
trace01:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
@@ -849,13 +891,17 @@ snat_in2out_node_fn_inline (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)
@@ -951,3 +997,273 @@ VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_slowpath_node, snat_in2out_slow_path_fn);
+
+static inline u32 icmp_in2out_static_map (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->src_address;
+ key0.port = echo0->identifier;
+
+ if (snat_static_mapping_match(sm, key0, &sm0, 0))
+ {
+ 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_IN2OUT_ERROR_NO_TRANSLATION];
+ return SNAT_IN2OUT_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->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ src_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_in2out_fast_static_map_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
+ u32 stats_node_index;
+
+ stats_node_index = snat_in2out_fast_node.index;
+
+ 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;
+ u32 sw_if_index0;
+ ip4_header_t * ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 old_port0, new_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);
+ next0 = SNAT_IN2OUT_NEXT_LOOKUP;
+
+ 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];
+
+ 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 trace0;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ 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))
+ goto trace0;
+
+ next0 = icmp_in2out_static_map
+ (sm, b0, ip0, icmp0, sw_if_index0, node, next0);
+ goto trace0;
+ }
+
+ key0.addr = ip0->src_address;
+ key0.port = udp0->src_port;
+
+ if (snat_static_mapping_match(sm, key0, &sm0, 0))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ next0= SNAT_IN2OUT_NEXT_DROP;
+ goto trace0;
+ }
+
+ new_addr0 = sm0.addr.as_u32;
+ new_port0 = sm0.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ src_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.src;
+ tcp0->ports.src = 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->src_port;
+ udp0->src_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);
+ }
+ }
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_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_IN2OUT_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, stats_node_index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+
+VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
+ .function = snat_in2out_fast_static_map_fn,
+ .name = "snat-in2out-fast",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_fast_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "snat-in2out-slowpath",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_fast_node, snat_in2out_fast_static_map_fn);