dns: make the dns name resolver a plugin

Type: refactor
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I823c2cd307a4613653a2d20f564dda062d4da31b

1 files changed, 0 insertions, 344 deletions

diff --git a/src/vnet/dns/request_node.c b/src/vnet/dns/request_node.c
deleted file mode 100644
index f9ad7cc0ad8..00000000000
--- a/src/vnet/dns/request_node.c
+++ /dev/null
@@ -1,344 +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 <vnet/dns/dns.h>
-
-#include <vlib/vlib.h>
-#include <vnet/vnet.h>
-
-vlib_node_registration_t dns46_request_node;
-
-typedef struct
-{
-  u32 pool_index;
-  u32 disposition;
-} dns46_request_trace_t;
-
-/* packet trace format function */
-static u8 *
-format_dns46_request_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 *);
-  dns46_request_trace_t *t = va_arg (*args, dns46_request_trace_t *);
-
-  s = format (s, "DNS46_REPLY: pool index %d, disposition  %d",
-	      t->pool_index, t->disposition);
-  return s;
-}
-
-vlib_node_registration_t dns46_request_node;
-
-static char *dns46_request_error_strings[] = {
-#define _(sym,string) string,
-  foreach_dns46_request_error
-#undef _
-};
-
-typedef enum
-{
-  DNS46_REQUEST_NEXT_DROP,
-  DNS46_REQUEST_NEXT_IP_LOOKUP,
-  DNS46_REQUEST_NEXT_PUNT,
-  DNS46_REQUEST_N_NEXT,
-} dns46_request_next_t;
-
-static uword
-dns46_request_inline (vlib_main_t * vm,
-		      vlib_node_runtime_t * node, vlib_frame_t * frame,
-		      int is_ip6)
-{
-  u32 n_left_from, *from, *to_next;
-  dns46_request_next_t next_index;
-  dns_main_t *dm = &dns_main;
-
-  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);
-
-#if 0
-      while (n_left_from >= 4 && n_left_to_next >= 2)
-	{
-	  u32 next0 = DNS46_REQUEST_NEXT_INTERFACE_OUTPUT;
-	  u32 next1 = DNS46_REQUEST_NEXT_INTERFACE_OUTPUT;
-	  u32 sw_if_index0, sw_if_index1;
-	  u8 tmp0[6], tmp1[6];
-	  ethernet_header_t *en0, *en1;
-	  u32 bi0, bi1;
-	  vlib_buffer_t *b0, *b1;
-
-	  /* Prefetch next iteration. */
-	  {
-	    vlib_buffer_t *p2, *p3;
-
-	    p2 = vlib_get_buffer (vm, from[2]);
-	    p3 = vlib_get_buffer (vm, from[3]);
-
-	    vlib_prefetch_buffer_header (p2, LOAD);
-	    vlib_prefetch_buffer_header (p3, LOAD);
-
-	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
-	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
-	  }
-
-	  /* speculatively enqueue b0 and b1 to the current next frame */
-	  to_next[0] = bi0 = from[0];
-	  to_next[1] = bi1 = from[1];
-	  from += 2;
-	  to_next += 2;
-	  n_left_from -= 2;
-	  n_left_to_next -= 2;
-
-	  b0 = vlib_get_buffer (vm, bi0);
-	  b1 = vlib_get_buffer (vm, bi1);
-
-	  /* $$$$$ End of processing 2 x packets $$$$$ */
-
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
-	    {
-	      if (b0->flags & VLIB_BUFFER_IS_TRACED)
-		{
-		  dns46_request_trace_t *t =
-		    vlib_add_trace (vm, node, b0, sizeof (*t));
-		  t->sw_if_index = sw_if_index0;
-		  t->next_index = next0;
-		}
-	      if (b1->flags & VLIB_BUFFER_IS_TRACED)
-		{
-		  dns46_request_trace_t *t =
-		    vlib_add_trace (vm, node, b1, sizeof (*t));
-		  t->sw_if_index = sw_if_index1;
-		  t->next_index = next1;
-		}
-	    }
-
-	  /* verify speculative enqueues, maybe switch current next frame */
-	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
-					   to_next, n_left_to_next,
-					   bi0, bi1, next0, next1);
-	}
-#endif
-
-      while (n_left_from > 0 && n_left_to_next > 0)
-	{
-	  u32 bi0;
-	  vlib_buffer_t *b0;
-	  u32 next0 = DNS46_REQUEST_NEXT_DROP;
-	  u32 error0 = DNS46_REQUEST_ERROR_NONE;
-	  udp_header_t *u0;
-	  dns_header_t *d0;
-	  dns_query_t *q0;
-	  ip4_header_t *ip40 = 0;
-	  ip6_header_t *ip60 = 0;
-	  dns_cache_entry_t *ep0;
-	  dns_pending_request_t _t0, *t0 = &_t0;
-	  u16 flags0;
-	  u32 pool_index0 = ~0;
-	  u8 *name0;
-	  u8 *label0;
-
-	  /* 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);
-	  d0 = vlib_buffer_get_current (b0);
-	  u0 = (udp_header_t *) ((u8 *) d0 - sizeof (*u0));
-
-	  if (PREDICT_FALSE (dm->is_enabled == 0))
-	    {
-	      next0 = DNS46_REQUEST_NEXT_PUNT;
-	      goto done0;
-	    }
-
-	  if (is_ip6)
-	    {
-	      ip60 = (ip6_header_t *) (((u8 *) u0) - sizeof (ip6_header_t));
-	      next0 = DNS46_REQUEST_NEXT_DROP;
-	      error0 = DNS46_REQUEST_ERROR_UNIMPLEMENTED;
-	      goto done0;
-	    }
-	  else
-	    {
-	      ip40 = (ip4_header_t *) (((u8 *) u0) - sizeof (ip4_header_t));
-	      if (ip40->ip_version_and_header_length != 0x45)
-		{
-		  error0 = DNS46_REQUEST_ERROR_IP_OPTIONS;
-		  goto done0;
-		}
-	    }
-	  /* Parse through the DNS request */
-	  flags0 = clib_net_to_host_u16 (d0->flags);
-
-	  /* Requests only */
-	  if (flags0 & DNS_QR)
-	    {
-	      next0 = DNS46_REQUEST_NEXT_DROP;
-	      error0 = DNS46_REQUEST_ERROR_BAD_REQUEST;
-	      goto done0;
-	    }
-	  if (clib_net_to_host_u16 (d0->qdcount) != 1)
-	    {
-	      next0 = DNS46_REQUEST_NEXT_DROP;
-	      error0 = DNS46_REQUEST_ERROR_TOO_MANY_REQUESTS;
-	      goto done0;
-	    }
-
-	  label0 = (u8 *) (d0 + 1);
-
-	  /*
-	   * vnet_dns_labels_to_name produces a non NULL terminated vector
-	   * vnet_dns_resolve_name expects a C-string.
-	   */
-	  name0 = vnet_dns_labels_to_name (label0, (u8 *) d0, (u8 **) & q0);
-	  vec_add1 (name0, 0);
-	  _vec_len (name0) -= 1;
-
-	  t0->request_type = DNS_PEER_PENDING_NAME_TO_IP;
-
-	  /*
-	   * See if this is a reverse lookup. Both ip4 and ip6 reverse
-	   * requests end with ".arpa"
-	   */
-	  if (PREDICT_TRUE (vec_len (name0) > 5))
-	    {
-	      u8 *aptr0 = name0 + vec_len (name0) - 5;
-
-	      if (!memcmp (aptr0, ".arpa", 5))
-		t0->request_type = DNS_PEER_PENDING_IP_TO_NAME;
-	    }
-
-	  t0->client_index = ~0;
-	  t0->is_ip6 = is_ip6;
-	  t0->dst_port = u0->src_port;
-	  t0->id = d0->id;
-	  t0->name = name0;
-	  if (is_ip6)
-	    clib_memcpy_fast (t0->dst_address, ip60->src_address.as_u8,
-			      sizeof (ip6_address_t));
-	  else
-	    clib_memcpy_fast (t0->dst_address, ip40->src_address.as_u8,
-			      sizeof (ip4_address_t));
-
-	  vnet_dns_resolve_name (dm, name0, t0, &ep0);
-
-	  if (ep0)
-	    {
-	      if (is_ip6)
-		vnet_send_dns6_reply (dm, t0, ep0, b0);
-	      else
-		vnet_send_dns4_reply (dm, t0, ep0, b0);
-	      next0 = DNS46_REQUEST_NEXT_IP_LOOKUP;
-	    }
-	  else
-	    {
-	      error0 = DNS46_REQUEST_ERROR_RESOLUTION_REQUIRED;
-	    }
-
-	done0:
-	  b0->error = node->errors[error0];
-
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      dns46_request_trace_t *t =
-		vlib_add_trace (vm, node, b0, sizeof (*t));
-	      t->disposition = error0;
-	      t->pool_index = pool_index0;
-	    }
-
-	  /* 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;
-}
-
-static uword
-dns4_request_node_fn (vlib_main_t * vm,
-		      vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-
-  return dns46_request_inline (vm, node, frame, 0 /* is_ip6 */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dns4_request_node) =
-{
-  .function = dns4_request_node_fn,
-  .name = "dns4-request",
-  .vector_size = sizeof (u32),
-  .format_trace = format_dns46_request_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (dns46_request_error_strings),
-  .error_strings = dns46_request_error_strings,
-  .n_next_nodes = DNS46_REQUEST_N_NEXT,
-  .next_nodes = {
-    [DNS46_REQUEST_NEXT_DROP] = "error-drop",
-    [DNS46_REQUEST_NEXT_PUNT] = "error-punt",
-    [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip4-lookup",
-  },
-};
-/* *INDENT-ON* */
-
-static uword
-dns6_request_node_fn (vlib_main_t * vm,
-		      vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-
-  return dns46_request_inline (vm, node, frame, 1 /* is_ip6 */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dns6_request_node) =
-{
-  .function = dns6_request_node_fn,
-  .name = "dns6-request",
-  .vector_size = sizeof (u32),
-  .format_trace = format_dns46_request_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (dns46_request_error_strings),
-  .error_strings = dns46_request_error_strings,
-  .n_next_nodes = DNS46_REQUEST_N_NEXT,
-  .next_nodes = {
-    [DNS46_REQUEST_NEXT_DROP] = "error-drop",
-    [DNS46_REQUEST_NEXT_PUNT] = "error-punt",
-    [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip6-lookup",
-  },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */