src/vnet/udp/udp_input.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2016 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 <vlibmemory/api.h>
 #include <vlib/vlib.h>

 #include <vppinfra/hash.h>
 #include <vppinfra/error.h>
 #include <vppinfra/elog.h>

 #include <vnet/vnet.h>
 #include <vnet/pg/pg.h>
 #include <vnet/ip/ip.h>
 #include <vnet/udp/udp.h>
 #include <vnet/udp/udp_packet.h>
 #include <vnet/session/session.h>

 static char *udp_error_strings[] = {
 #define udp_error(n,s) s,
 #include "udp_error.def"
 #undef udp_error
 };

 typedef struct
 {
   u32 connection;
   u32 disposition;
   u32 thread_index;
 } udp_input_trace_t;

 /* packet trace format function */
 static u8 *
 format_udp_input_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 *);
   udp_input_trace_t *t = va_arg (*args, udp_input_trace_t *);

   s = format (s, "UDP_INPUT: connection %d, disposition %d, thread %d",
 	      t->connection, t->disposition, t->thread_index);
   return s;
 }

 #define foreach_udp_input_next			\
   _ (DROP, "error-drop")

 typedef enum
 {
 #define _(s, n) UDP_INPUT_NEXT_##s,
   foreach_udp_input_next
 #undef _
     UDP_INPUT_N_NEXT,
 } udp_input_next_t;

 always_inline void
 udp_input_inc_counter (vlib_main_t * vm, u8 is_ip4, u8 evt, u8 val)
 {
   if (PREDICT_TRUE (!val))
     return;

   if (is_ip4)
     vlib_node_increment_counter (vm, udp4_input_node.index, evt, val);
   else
     vlib_node_increment_counter (vm, udp6_input_node.index, evt, val);
 }

 always_inline uword
 udp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		    vlib_frame_t * frame, u8 is_ip4)
 {
   u32 n_left_from, *from, *to_next;
   u32 next_index, errors;
   u32 my_thread_index = vm->thread_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, fib_index0;
 	  vlib_buffer_t *b0;
 	  u32 next0 = UDP_INPUT_NEXT_DROP;
 	  u32 error0 = UDP_ERROR_ENQUEUED;
 	  udp_header_t *udp0;
 	  ip4_header_t *ip40;
 	  ip6_header_t *ip60;
 	  u8 *data0;
 	  session_t *s0;
 	  udp_connection_t *uc0, *child0, *new_uc0;
 	  transport_connection_t *tc0;
 	  int wrote0;
 	  void *rmt_addr, *lcl_addr;
 	  session_dgram_hdr_t hdr0;

 	  /* 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);

 	  /* udp_local hands us a pointer to the udp data */
 	  data0 = vlib_buffer_get_current (b0);
 	  udp0 = (udp_header_t *) (data0 - sizeof (*udp0));
 	  fib_index0 = vnet_buffer (b0)->ip.fib_index;

 	  if (is_ip4)
 	    {
 	      /* TODO: must fix once udp_local does ip options correctly */
 	      ip40 = (ip4_header_t *) (((u8 *) udp0) - sizeof (*ip40));
 	      s0 = session_lookup_safe4 (fib_index0, &ip40->dst_address,
 					 &ip40->src_address, udp0->dst_port,
 					 udp0->src_port, TRANSPORT_PROTO_UDP);
 	      lcl_addr = &ip40->dst_address;
 	      rmt_addr = &ip40->src_address;

 	    }
 	  else
 	    {
 	      ip60 = (ip6_header_t *) (((u8 *) udp0) - sizeof (*ip60));
 	      s0 = session_lookup_safe6 (fib_index0, &ip60->dst_address,
 					 &ip60->src_address, udp0->dst_port,
 					 udp0->src_port, TRANSPORT_PROTO_UDP);
 	      lcl_addr = &ip60->dst_address;
 	      rmt_addr = &ip60->src_address;
 	    }

 	  if (PREDICT_FALSE (!s0))
 	    {
 	      error0 = UDP_ERROR_NO_LISTENER;
 	      goto trace0;
 	    }

 	  if (s0->session_state == SESSION_STATE_OPENED)
 	    {
 	      /* TODO optimization: move cl session to right thread
 	       * However, since such a move would affect the session handle,
 	       * which we pass 'raw' to the app, we'd also have notify the
 	       * app of the change or change the way we pass handles to apps.
 	       */
 	      tc0 = session_get_transport (s0);
 	      uc0 = udp_get_connection_from_transport (tc0);
 	      if (uc0->is_connected)
 		{
 		  /*
 		   * Clone the transport. It will be cleaned up with the
 		   * session once we notify the session layer.
 		   */
 		  new_uc0 = udp_connection_clone_safe (s0->connection_index,
 						       s0->thread_index);
 		  ASSERT (s0->session_index == new_uc0->c_s_index);

 		  /*
 		   * Drop the 'lock' on pool resize
 		   */
 		  session_pool_remove_peeker (s0->thread_index);
 		  session_dgram_connect_notify (&new_uc0->connection,
 						s0->thread_index, &s0);
 		  tc0 = &new_uc0->connection;
 		}
 	    }
 	  else if (s0->session_state == SESSION_STATE_READY)
 	    {
 	      tc0 = session_get_transport (s0);
 	      uc0 = udp_get_connection_from_transport (tc0);
 	    }
 	  else if (s0->session_state == SESSION_STATE_LISTENING)
 	    {
 	      tc0 = listen_session_get_transport (s0);
 	      uc0 = udp_get_connection_from_transport (tc0);
 	      if (uc0->is_connected)
 		{
 		  child0 = udp_connection_alloc (my_thread_index);
 		  if (is_ip4)
 		    {
 		      ip_set (&child0->c_lcl_ip, &ip40->dst_address, 1);
 		      ip_set (&child0->c_rmt_ip, &ip40->src_address, 1);
 		    }
 		  else
 		    {
 		      ip_set (&child0->c_lcl_ip, &ip60->dst_address, 0);
 		      ip_set (&child0->c_rmt_ip, &ip60->src_address, 0);
 		    }
 		  child0->c_lcl_port = udp0->dst_port;
 		  child0->c_rmt_port = udp0->src_port;
 		  child0->c_is_ip4 = is_ip4;

 		  if (session_stream_accept (&child0->connection,
 					     tc0->s_index, 1))
 		    {
 		      error0 = UDP_ERROR_CREATE_SESSION;
 		      goto trace0;
 		    }
 		  s0 =
 		    session_get (child0->c_s_index, child0->c_thread_index);
 		  s0->session_state = SESSION_STATE_READY;
 		  tc0 = &child0->connection;
 		  uc0 = udp_get_connection_from_transport (tc0);
 		  error0 = UDP_ERROR_LISTENER;
 		}
 	    }
 	  else
 	    {
 	      error0 = UDP_ERROR_NOT_READY;
 	      goto trace0;
 	    }

 	  if (!uc0->is_connected)
 	    {
 	      if (svm_fifo_max_enqueue (s0->rx_fifo)
 		  < b0->current_length + sizeof (session_dgram_hdr_t))
 		{
 		  error0 = UDP_ERROR_FIFO_FULL;
 		  goto trace0;
 		}
 	      hdr0.data_length = b0->current_length;
 	      hdr0.data_offset = 0;
 	      ip_set (&hdr0.lcl_ip, lcl_addr, is_ip4);
 	      ip_set (&hdr0.rmt_ip, rmt_addr, is_ip4);
 	      hdr0.lcl_port = udp0->dst_port;
 	      hdr0.rmt_port = udp0->src_port;
 	      hdr0.is_ip4 = is_ip4;

 	      clib_spinlock_lock (&uc0->rx_lock);
 	      wrote0 = session_enqueue_dgram_connection (s0, &hdr0, b0,
 							 TRANSPORT_PROTO_UDP,
 							 1 /* queue evt */ );
 	      clib_spinlock_unlock (&uc0->rx_lock);
 	      ASSERT (wrote0 > 0);

 	      if (s0->session_state != SESSION_STATE_LISTENING)
 		session_pool_remove_peeker (s0->thread_index);
 	    }
 	  else
 	    {
 	      if (svm_fifo_max_enqueue (s0->rx_fifo) < b0->current_length)
 		{
 		  error0 = UDP_ERROR_FIFO_FULL;
 		  goto trace0;
 		}
 	      wrote0 = session_enqueue_stream_connection (tc0, b0, 0,
 							  1 /* queue evt */ ,
 							  1 /* in order */ );
 	      ASSERT (wrote0 > 0);
 	    }

 	trace0:

 	  b0->error = node->errors[error0];

 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
 			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 	    {
 	      udp_input_trace_t *t = vlib_add_trace (vm, node, b0,
 						     sizeof (*t));

 	      t->connection = s0 ? s0->connection_index : ~0;
 	      t->disposition = error0;
 	      t->thread_index = my_thread_index;
 	    }

 	  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);
     }

   errors = session_main_flush_all_enqueue_events (TRANSPORT_PROTO_UDP);
   udp_input_inc_counter (vm, is_ip4, UDP_ERROR_EVENT_FIFO_FULL, errors);
   return frame->n_vectors;
 }


 static uword
 udp4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
 	    vlib_frame_t * frame)
 {
   return udp46_input_inline (vm, node, frame, 1);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (udp4_input_node) =
 {
   .function = udp4_input,
   .name = "udp4-input",
   .vector_size = sizeof (u32),
   .format_trace = format_udp_input_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = ARRAY_LEN (udp_error_strings),
   .error_strings = udp_error_strings,
   .n_next_nodes = UDP_INPUT_N_NEXT,
   .next_nodes = {
 #define _(s, n) [UDP_INPUT_NEXT_##s] = n,
       foreach_udp_input_next
 #undef _
   },
 };
 /* *INDENT-ON* */

 static uword
 udp6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
 	    vlib_frame_t * frame)
 {
   return udp46_input_inline (vm, node, frame, 0);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (udp6_input_node) =
 {
   .function = udp6_input,
   .name = "udp6-input",
   .vector_size = sizeof (u32),
   .format_trace = format_udp_input_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = ARRAY_LEN (udp_error_strings),
   .error_strings = udp_error_strings,
   .n_next_nodes = UDP_INPUT_N_NEXT,
   .next_nodes = {
 #define _(s, n) [UDP_INPUT_NEXT_##s] = n,
       foreach_udp_input_next
 #undef _
   },
 };
 /* *INDENT-ON* */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2016 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 <vlibmemory/api.h>
	#include <vlib/vlib.h>

	#include <vppinfra/hash.h>
	#include <vppinfra/error.h>
	#include <vppinfra/elog.h>

	#include <vnet/vnet.h>
	#include <vnet/pg/pg.h>
	#include <vnet/ip/ip.h>
	#include <vnet/udp/udp.h>
	#include <vnet/udp/udp_packet.h>
	#include <vnet/session/session.h>

	static char *udp_error_strings[] = {
	#define udp_error(n,s) s,
	#include "udp_error.def"
	#undef udp_error
	};

	typedef struct
	{
	u32 connection;
	u32 disposition;
	u32 thread_index;
	} udp_input_trace_t;

	/* packet trace format function */
	static u8 *
	format_udp_input_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 );
	udp_input_trace_t t = va_arg (args, udp_input_trace_t *);

	s = format (s, "UDP_INPUT: connection %d, disposition %d, thread %d",
	t->connection, t->disposition, t->thread_index);
	return s;
	}

	#define foreach_udp_input_next \
	_ (DROP, "error-drop")

	typedef enum
	{
	#define _(s, n) UDP_INPUT_NEXT_##s,
	foreach_udp_input_next
	#undef _
	UDP_INPUT_N_NEXT,
	} udp_input_next_t;

	always_inline void
	udp_input_inc_counter (vlib_main_t * vm, u8 is_ip4, u8 evt, u8 val)
	{
	if (PREDICT_TRUE (!val))
	return;

	if (is_ip4)
	vlib_node_increment_counter (vm, udp4_input_node.index, evt, val);
	else
	vlib_node_increment_counter (vm, udp6_input_node.index, evt, val);
	}

	always_inline uword
	udp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame, u8 is_ip4)
	{
	u32 n_left_from, from, to_next;
	u32 next_index, errors;
	u32 my_thread_index = vm->thread_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, fib_index0;
	vlib_buffer_t *b0;
	u32 next0 = UDP_INPUT_NEXT_DROP;
	u32 error0 = UDP_ERROR_ENQUEUED;
	udp_header_t *udp0;
	ip4_header_t *ip40;
	ip6_header_t *ip60;
	u8 *data0;
	session_t *s0;
	udp_connection_t uc0, child0, *new_uc0;
	transport_connection_t *tc0;
	int wrote0;
	void rmt_addr, lcl_addr;
	session_dgram_hdr_t hdr0;

	/* 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);

	/* udp_local hands us a pointer to the udp data */
	data0 = vlib_buffer_get_current (b0);
	udp0 = (udp_header_t ) (data0 - sizeof (udp0));
	fib_index0 = vnet_buffer (b0)->ip.fib_index;

	if (is_ip4)
	{
	/* TODO: must fix once udp_local does ip options correctly */
	ip40 = (ip4_header_t ) (((u8 ) udp0) - sizeof (*ip40));
	s0 = session_lookup_safe4 (fib_index0, &ip40->dst_address,
	&ip40->src_address, udp0->dst_port,
	udp0->src_port, TRANSPORT_PROTO_UDP);
	lcl_addr = &ip40->dst_address;
	rmt_addr = &ip40->src_address;

	}
	else
	{
	ip60 = (ip6_header_t ) (((u8 ) udp0) - sizeof (*ip60));
	s0 = session_lookup_safe6 (fib_index0, &ip60->dst_address,
	&ip60->src_address, udp0->dst_port,
	udp0->src_port, TRANSPORT_PROTO_UDP);
	lcl_addr = &ip60->dst_address;
	rmt_addr = &ip60->src_address;
	}

	if (PREDICT_FALSE (!s0))
	{
	error0 = UDP_ERROR_NO_LISTENER;
	goto trace0;
	}

	if (s0->session_state == SESSION_STATE_OPENED)
	{
	/* TODO optimization: move cl session to right thread
	* However, since such a move would affect the session handle,
	* which we pass 'raw' to the app, we'd also have notify the
	* app of the change or change the way we pass handles to apps.
	*/
	tc0 = session_get_transport (s0);
	uc0 = udp_get_connection_from_transport (tc0);
	if (uc0->is_connected)
	{
	/*
	* Clone the transport. It will be cleaned up with the
	* session once we notify the session layer.
	*/
	new_uc0 = udp_connection_clone_safe (s0->connection_index,
	s0->thread_index);
	ASSERT (s0->session_index == new_uc0->c_s_index);

	/*
	* Drop the 'lock' on pool resize
	*/
	session_pool_remove_peeker (s0->thread_index);
	session_dgram_connect_notify (&new_uc0->connection,
	s0->thread_index, &s0);
	tc0 = &new_uc0->connection;
	}
	}
	else if (s0->session_state == SESSION_STATE_READY)
	{
	tc0 = session_get_transport (s0);
	uc0 = udp_get_connection_from_transport (tc0);
	}
	else if (s0->session_state == SESSION_STATE_LISTENING)
	{
	tc0 = listen_session_get_transport (s0);
	uc0 = udp_get_connection_from_transport (tc0);
	if (uc0->is_connected)
	{
	child0 = udp_connection_alloc (my_thread_index);
	if (is_ip4)
	{
	ip_set (&child0->c_lcl_ip, &ip40->dst_address, 1);
	ip_set (&child0->c_rmt_ip, &ip40->src_address, 1);
	}
	else
	{
	ip_set (&child0->c_lcl_ip, &ip60->dst_address, 0);
	ip_set (&child0->c_rmt_ip, &ip60->src_address, 0);
	}
	child0->c_lcl_port = udp0->dst_port;
	child0->c_rmt_port = udp0->src_port;
	child0->c_is_ip4 = is_ip4;

	if (session_stream_accept (&child0->connection,
	tc0->s_index, 1))
	{
	error0 = UDP_ERROR_CREATE_SESSION;
	goto trace0;
	}
	s0 =
	session_get (child0->c_s_index, child0->c_thread_index);
	s0->session_state = SESSION_STATE_READY;
	tc0 = &child0->connection;
	uc0 = udp_get_connection_from_transport (tc0);
	error0 = UDP_ERROR_LISTENER;
	}
	}
	else
	{
	error0 = UDP_ERROR_NOT_READY;
	goto trace0;
	}

	if (!uc0->is_connected)
	{
	if (svm_fifo_max_enqueue (s0->rx_fifo)
	< b0->current_length + sizeof (session_dgram_hdr_t))
	{
	error0 = UDP_ERROR_FIFO_FULL;
	goto trace0;
	}
	hdr0.data_length = b0->current_length;
	hdr0.data_offset = 0;
	ip_set (&hdr0.lcl_ip, lcl_addr, is_ip4);
	ip_set (&hdr0.rmt_ip, rmt_addr, is_ip4);
	hdr0.lcl_port = udp0->dst_port;
	hdr0.rmt_port = udp0->src_port;
	hdr0.is_ip4 = is_ip4;

	clib_spinlock_lock (&uc0->rx_lock);
	wrote0 = session_enqueue_dgram_connection (s0, &hdr0, b0,
	TRANSPORT_PROTO_UDP,
	1 /* queue evt */ );
	clib_spinlock_unlock (&uc0->rx_lock);
	ASSERT (wrote0 > 0);

	if (s0->session_state != SESSION_STATE_LISTENING)
	session_pool_remove_peeker (s0->thread_index);
	}
	else
	{
	if (svm_fifo_max_enqueue (s0->rx_fifo) < b0->current_length)
	{
	error0 = UDP_ERROR_FIFO_FULL;
	goto trace0;
	}
	wrote0 = session_enqueue_stream_connection (tc0, b0, 0,
	1 /* queue evt */ ,
	1 /* in order */ );
	ASSERT (wrote0 > 0);
	}

	trace0:

	b0->error = node->errors[error0];

	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	udp_input_trace_t *t = vlib_add_trace (vm, node, b0,
	sizeof (*t));

	t->connection = s0 ? s0->connection_index : ~0;
	t->disposition = error0;
	t->thread_index = my_thread_index;
	}

	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);
	}

	errors = session_main_flush_all_enqueue_events (TRANSPORT_PROTO_UDP);
	udp_input_inc_counter (vm, is_ip4, UDP_ERROR_EVENT_FIFO_FULL, errors);
	return frame->n_vectors;
	}


	static uword
	udp4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return udp46_input_inline (vm, node, frame, 1);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (udp4_input_node) =
	{
	.function = udp4_input,
	.name = "udp4-input",
	.vector_size = sizeof (u32),
	.format_trace = format_udp_input_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = ARRAY_LEN (udp_error_strings),
	.error_strings = udp_error_strings,
	.n_next_nodes = UDP_INPUT_N_NEXT,
	.next_nodes = {
	#define _(s, n) [UDP_INPUT_NEXT_##s] = n,
	foreach_udp_input_next
	#undef _
	},
	};
	/* INDENT-ON */

	static uword
	udp6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return udp46_input_inline (vm, node, frame, 0);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (udp6_input_node) =
	{
	.function = udp6_input,
	.name = "udp6-input",
	.vector_size = sizeof (u32),
	.format_trace = format_udp_input_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = ARRAY_LEN (udp_error_strings),
	.error_strings = udp_error_strings,
	.n_next_nodes = UDP_INPUT_N_NEXT,
	.next_nodes = {
	#define _(s, n) [UDP_INPUT_NEXT_##s] = n,
	foreach_udp_input_next
	#undef _
	},
	};
	/* INDENT-ON */

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/