nat: move dslite to separate sub-plugin

Type: refactor
Change-Id: If3d9f16f3a06c10b354f1eef674e8db5f3c44de7
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 0 insertions, 503 deletions

diff --git a/src/plugins/nat/dslite_in2out.c b/src/plugins/nat/dslite_in2out.c
deleted file mode 100644
index 4494a77701e..00000000000
--- a/src/plugins/nat/dslite_in2out.c
+++ /dev/null
@@ -1,503 +0,0 @@
-/*
- * Copyright (c) 2017 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#include <nat/dslite.h>
-#include <nat/nat_inlines.h>
-#include <nat/nat_syslog.h>
-
-typedef enum
-{
-  DSLITE_IN2OUT_NEXT_IP4_LOOKUP,
-  DSLITE_IN2OUT_NEXT_IP6_ICMP,
-  DSLITE_IN2OUT_NEXT_DROP,
-  DSLITE_IN2OUT_NEXT_SLOWPATH,
-  DSLITE_IN2OUT_N_NEXT,
-} dslite_in2out_next_t;
-
-static char *dslite_in2out_error_strings[] = {
-#define _(sym,string) string,
-  foreach_dslite_error
-#undef _
-};
-
-static u32
-slow_path (dslite_main_t * dm, dslite_session_key_t * in2out_key,
-	   dslite_session_t ** sp, u32 next, u8 * error, u32 thread_index)
-{
-  dslite_b4_t *b4;
-  clib_bihash_kv_16_8_t b4_kv, b4_value;
-  clib_bihash_kv_24_8_t in2out_kv;
-  clib_bihash_kv_8_8_t out2in_kv;
-  dlist_elt_t *head_elt, *oldest_elt, *elt;
-  u32 oldest_index;
-  dslite_session_t *s;
-  snat_session_key_t out2in_key;
-  u32 b4_index;
-
-  out2in_key.protocol = in2out_key->proto;
-  out2in_key.fib_index = 0;
-
-  b4_kv.key[0] = in2out_key->softwire_id.as_u64[0];
-  b4_kv.key[1] = in2out_key->softwire_id.as_u64[1];
-
-  if (clib_bihash_search_16_8
-      (&dm->per_thread_data[thread_index].b4_hash, &b4_kv, &b4_value))
-    {
-      pool_get (dm->per_thread_data[thread_index].b4s, b4);
-      clib_memset (b4, 0, sizeof (*b4));
-      b4->addr.as_u64[0] = in2out_key->softwire_id.as_u64[0];
-      b4->addr.as_u64[1] = in2out_key->softwire_id.as_u64[1];
-
-      pool_get (dm->per_thread_data[thread_index].list_pool, head_elt);
-      b4->sessions_per_b4_list_head_index =
-	head_elt - dm->per_thread_data[thread_index].list_pool;
-      clib_dlist_init (dm->per_thread_data[thread_index].list_pool,
-		       b4->sessions_per_b4_list_head_index);
-
-      b4_index = b4_kv.value = b4 - dm->per_thread_data[thread_index].b4s;
-      clib_bihash_add_del_16_8 (&dm->per_thread_data[thread_index].b4_hash,
-				&b4_kv, 1);
-
-      vlib_set_simple_counter (&dm->total_b4s, thread_index, 0,
-			       pool_elts (dm->
-					  per_thread_data[thread_index].b4s));
-    }
-  else
-    {
-      b4_index = b4_value.value;
-      b4 =
-	pool_elt_at_index (dm->per_thread_data[thread_index].b4s,
-			   b4_value.value);
-    }
-
-  //TODO configurable quota
-  if (b4->nsessions >= 1000)
-    {
-      oldest_index =
-	clib_dlist_remove_head (dm->per_thread_data[thread_index].list_pool,
-				b4->sessions_per_b4_list_head_index);
-      ASSERT (oldest_index != ~0);
-      clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
-			  b4->sessions_per_b4_list_head_index, oldest_index);
-      oldest_elt =
-	pool_elt_at_index (dm->per_thread_data[thread_index].list_pool,
-			   oldest_index);
-      s =
-	pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
-			   oldest_elt->value);
-
-      in2out_kv.key[0] = s->in2out.as_u64[0];
-      in2out_kv.key[1] = s->in2out.as_u64[1];
-      in2out_kv.key[2] = s->in2out.as_u64[2];
-      clib_bihash_add_del_24_8 (&dm->per_thread_data[thread_index].in2out,
-				&in2out_kv, 0);
-      out2in_kv.key = s->out2in.as_u64;
-      clib_bihash_add_del_8_8 (&dm->per_thread_data[thread_index].out2in,
-			       &out2in_kv, 0);
-      snat_free_outside_address_and_port (dm->addr_pool, thread_index,
-					  &s->out2in);
-
-      nat_syslog_dslite_apmdel (b4_index, &s->in2out.softwire_id,
-				&s->in2out.addr, s->in2out.port,
-				&s->out2in.addr, s->out2in.port,
-				s->in2out.proto);
-
-      if (snat_alloc_outside_address_and_port
-	  (dm->addr_pool, 0, thread_index, &out2in_key,
-	   dm->port_per_thread, thread_index))
-	ASSERT (0);
-    }
-  else
-    {
-      if (snat_alloc_outside_address_and_port
-	  (dm->addr_pool, 0, thread_index, &out2in_key,
-	   dm->port_per_thread, thread_index))
-	{
-	  *error = DSLITE_ERROR_OUT_OF_PORTS;
-	  return DSLITE_IN2OUT_NEXT_DROP;
-	}
-      pool_get (dm->per_thread_data[thread_index].sessions, s);
-      clib_memset (s, 0, sizeof (*s));
-      b4->nsessions++;
-
-      pool_get (dm->per_thread_data[thread_index].list_pool, elt);
-      clib_dlist_init (dm->per_thread_data[thread_index].list_pool,
-		       elt - dm->per_thread_data[thread_index].list_pool);
-      elt->value = s - dm->per_thread_data[thread_index].sessions;
-      s->per_b4_index = elt - dm->per_thread_data[thread_index].list_pool;
-      s->per_b4_list_head_index = b4->sessions_per_b4_list_head_index;
-      clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
-			  s->per_b4_list_head_index,
-			  elt - dm->per_thread_data[thread_index].list_pool);
-
-      vlib_set_simple_counter (&dm->total_sessions, thread_index, 0,
-			       pool_elts (dm->per_thread_data
-					  [thread_index].sessions));
-    }
-
-  s->in2out = *in2out_key;
-  s->out2in = out2in_key;
-  *sp = s;
-  in2out_kv.key[0] = s->in2out.as_u64[0];
-  in2out_kv.key[1] = s->in2out.as_u64[1];
-  in2out_kv.key[2] = s->in2out.as_u64[2];
-  in2out_kv.value = s - dm->per_thread_data[thread_index].sessions;
-  clib_bihash_add_del_24_8 (&dm->per_thread_data[thread_index].in2out,
-			    &in2out_kv, 1);
-  out2in_kv.key = s->out2in.as_u64;
-  out2in_kv.value = s - dm->per_thread_data[thread_index].sessions;
-  clib_bihash_add_del_8_8 (&dm->per_thread_data[thread_index].out2in,
-			   &out2in_kv, 1);
-
-  nat_syslog_dslite_apmadd (b4_index, &s->in2out.softwire_id, &s->in2out.addr,
-			    s->in2out.port, &s->out2in.addr, s->out2in.port,
-			    s->in2out.proto);
-
-  return next;
-}
-
-static inline u32
-dslite_icmp_in2out (dslite_main_t * dm, ip6_header_t * ip6,
-		    ip4_header_t * ip4, dslite_session_t ** sp, u32 next,
-		    u8 * error, u32 thread_index)
-{
-  dslite_session_t *s = 0;
-  icmp46_header_t *icmp = ip4_next_header (ip4);
-  clib_bihash_kv_24_8_t kv, value;
-  dslite_session_key_t key;
-  u32 n = next;
-  icmp_echo_header_t *echo;
-  u32 new_addr, old_addr;
-  u16 old_id, new_id;
-  ip_csum_t sum;
-
-  if (icmp_type_is_error_message (icmp->type))
-    {
-      n = DSLITE_IN2OUT_NEXT_DROP;
-      *error = DSLITE_ERROR_BAD_ICMP_TYPE;
-      goto done;
-    }
-
-  echo = (icmp_echo_header_t *) (icmp + 1);
-
-  key.addr = ip4->src_address;
-  key.port = echo->identifier;
-  key.proto = SNAT_PROTOCOL_ICMP;
-  key.softwire_id.as_u64[0] = ip6->src_address.as_u64[0];
-  key.softwire_id.as_u64[1] = ip6->src_address.as_u64[1];
-  key.pad = 0;
-  kv.key[0] = key.as_u64[0];
-  kv.key[1] = key.as_u64[1];
-  kv.key[2] = key.as_u64[2];
-
-  if (clib_bihash_search_24_8
-      (&dm->per_thread_data[thread_index].in2out, &kv, &value))
-    {
-      n = slow_path (dm, &key, &s, next, error, thread_index);
-      if (PREDICT_FALSE (next == DSLITE_IN2OUT_NEXT_DROP))
-	goto done;
-    }
-  else
-    {
-      s =
-	pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
-			   value.value);
-    }
-
-  old_addr = ip4->src_address.as_u32;
-  ip4->src_address = s->out2in.addr;
-  new_addr = ip4->src_address.as_u32;
-  sum = ip4->checksum;
-  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
-  ip4->checksum = ip_csum_fold (sum);
-
-  old_id = echo->identifier;
-  echo->identifier = new_id = s->out2in.port;
-  sum = icmp->checksum;
-  sum = ip_csum_update (sum, old_id, new_id, icmp_echo_header_t, identifier);
-  icmp->checksum = ip_csum_fold (sum);
-
-done:
-  *sp = s;
-  return n;
-}
-
-static inline uword
-dslite_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-			      vlib_frame_t * frame, u8 is_slow_path)
-{
-  u32 n_left_from, *from, *to_next;
-  dslite_in2out_next_t next_index;
-  u32 node_index;
-  vlib_node_runtime_t *error_node;
-  u32 thread_index = vm->thread_index;
-  f64 now = vlib_time_now (vm);
-  dslite_main_t *dm = &dslite_main;
-
-  node_index =
-    is_slow_path ? dm->dslite_in2out_slowpath_node_index :
-    dm->dslite_in2out_node_index;
-
-  error_node = vlib_node_get_runtime (vm, 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 = DSLITE_IN2OUT_NEXT_IP4_LOOKUP;
-	  ip4_header_t *ip40;
-	  ip6_header_t *ip60;
-	  u8 error0 = DSLITE_ERROR_IN2OUT;
-	  u32 proto0;
-	  dslite_session_t *s0 = 0;
-	  clib_bihash_kv_24_8_t kv0, value0;
-	  dslite_session_key_t key0;
-	  udp_header_t *udp0;
-	  tcp_header_t *tcp0;
-	  ip_csum_t sum0;
-	  u32 new_addr0, old_addr0;
-	  u16 old_port0, new_port0;
-
-	  /* 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);
-	  ip60 = vlib_buffer_get_current (b0);
-
-	  if (PREDICT_FALSE (ip60->protocol != IP_PROTOCOL_IP_IN_IP))
-	    {
-	      if (ip60->protocol == IP_PROTOCOL_ICMP6)
-		{
-		  next0 = DSLITE_IN2OUT_NEXT_IP6_ICMP;
-		  goto trace0;
-		}
-	      error0 = DSLITE_ERROR_BAD_IP6_PROTOCOL;
-	      next0 = DSLITE_IN2OUT_NEXT_DROP;
-	      goto trace0;
-	    }
-
-	  ip40 = vlib_buffer_get_current (b0) + sizeof (ip6_header_t);
-	  proto0 = ip_proto_to_snat_proto (ip40->protocol);
-
-	  if (PREDICT_FALSE (proto0 == ~0))
-	    {
-	      error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
-	      next0 = DSLITE_IN2OUT_NEXT_DROP;
-	      goto trace0;
-	    }
-
-	  udp0 = ip4_next_header (ip40);
-	  tcp0 = (tcp_header_t *) udp0;
-
-	  if (is_slow_path)
-	    {
-	      if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
-		{
-		  next0 =
-		    dslite_icmp_in2out (dm, ip60, ip40, &s0, next0, &error0,
-					thread_index);
-		  if (PREDICT_FALSE (next0 == DSLITE_IN2OUT_NEXT_DROP))
-		    goto trace0;
-
-		  goto accounting0;
-		}
-	    }
-	  else
-	    {
-	      if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
-		{
-		  next0 = DSLITE_IN2OUT_NEXT_SLOWPATH;
-		  goto trace0;
-		}
-	    }
-
-	  key0.addr = ip40->src_address;
-	  key0.port = udp0->src_port;
-	  key0.proto = proto0;
-	  key0.softwire_id.as_u64[0] = ip60->src_address.as_u64[0];
-	  key0.softwire_id.as_u64[1] = ip60->src_address.as_u64[1];
-	  key0.pad = 0;
-	  kv0.key[0] = key0.as_u64[0];
-	  kv0.key[1] = key0.as_u64[1];
-	  kv0.key[2] = key0.as_u64[2];
-
-	  if (clib_bihash_search_24_8
-	      (&dm->per_thread_data[thread_index].in2out, &kv0, &value0))
-	    {
-	      if (is_slow_path)
-		{
-		  next0 =
-		    slow_path (dm, &key0, &s0, next0, &error0, thread_index);
-		  if (PREDICT_FALSE (next0 == DSLITE_IN2OUT_NEXT_DROP))
-		    goto trace0;
-		}
-	      else
-		{
-		  next0 = DSLITE_IN2OUT_NEXT_SLOWPATH;
-		  goto trace0;
-		}
-	    }
-	  else
-	    {
-	      s0 =
-		pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
-				   value0.value);
-	    }
-
-	  old_addr0 = ip40->src_address.as_u32;
-	  ip40->src_address = s0->out2in.addr;
-	  new_addr0 = ip40->src_address.as_u32;
-	  sum0 = ip40->checksum;
-	  sum0 =
-	    ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
-			    src_address);
-	  ip40->checksum = ip_csum_fold (sum0);
-	  if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
-	    {
-	      old_port0 = tcp0->src_port;
-	      tcp0->src_port = s0->out2in.port;
-	      new_port0 = tcp0->src_port;
-
-	      sum0 = tcp0->checksum;
-	      sum0 =
-		ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
-				dst_address);
-	      sum0 =
-		ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
-				length);
-	      mss_clamping (&snat_main, tcp0, &sum0);
-	      tcp0->checksum = ip_csum_fold (sum0);
-	    }
-	  else
-	    {
-	      old_port0 = udp0->src_port;
-	      udp0->src_port = s0->out2in.port;
-	      udp0->checksum = 0;
-	    }
-
-	accounting0:
-	  /* Accounting */
-	  s0->last_heard = now;
-	  s0->total_pkts++;
-	  s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
-	  /* Per-B4 LRU list maintenance */
-	  clib_dlist_remove (dm->per_thread_data[thread_index].list_pool,
-			     s0->per_b4_index);
-	  clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
-			      s0->per_b4_list_head_index, s0->per_b4_index);
-
-	  ip40->tos =
-	    (clib_net_to_host_u32
-	     (ip60->ip_version_traffic_class_and_flow_label) & 0x0ff00000) >>
-	    20;
-	  vlib_buffer_advance (b0, sizeof (ip6_header_t));
-
-	trace0:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
-	      t->next_index = next0;
-	      t->session_index = ~0;
-	      if (s0)
-		t->session_index =
-		  s0 - dm->per_thread_data[thread_index].sessions;
-	    }
-
-	  b0->error = error_node->errors[error0];
-
-	  /* 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);
-    }
-
-  return frame->n_vectors;
-}
-
-VLIB_NODE_FN (dslite_in2out_node) (vlib_main_t * vm,
-				   vlib_node_runtime_t * node,
-				   vlib_frame_t * frame)
-{
-  return dslite_in2out_node_fn_inline (vm, node, frame, 0);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dslite_in2out_node) = {
-  .name = "dslite-in2out",
-  .vector_size = sizeof (u32),
-  .format_trace = format_dslite_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (dslite_in2out_error_strings),
-  .error_strings = dslite_in2out_error_strings,
-  .n_next_nodes = DSLITE_IN2OUT_N_NEXT,
-  /* edit / add dispositions here */
-  .next_nodes = {
-    [DSLITE_IN2OUT_NEXT_DROP] = "error-drop",
-    [DSLITE_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
-    [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-icmp-input",
-    [DSLITE_IN2OUT_NEXT_SLOWPATH] = "dslite-in2out-slowpath",
-  },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (dslite_in2out_slowpath_node) (vlib_main_t * vm,
-					    vlib_node_runtime_t * node,
-					    vlib_frame_t * frame)
-{
-  return dslite_in2out_node_fn_inline (vm, node, frame, 1);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dslite_in2out_slowpath_node) = {
-  .name = "dslite-in2out-slowpath",
-  .vector_size = sizeof (u32),
-  .format_trace = format_dslite_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (dslite_in2out_error_strings),
-  .error_strings = dslite_in2out_error_strings,
-  .n_next_nodes = DSLITE_IN2OUT_N_NEXT,
-  /* edit / add dispositions here */
-  .next_nodes = {
-    [DSLITE_IN2OUT_NEXT_DROP] = "error-drop",
-    [DSLITE_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
-    [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-lookup",
-    [DSLITE_IN2OUT_NEXT_SLOWPATH] = "dslite-in2out-slowpath",
-  },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */