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

 /* SPDX-License-Identifier: Apache-2.0
  * Copyright(c) 2022 Cisco Systems, Inc.
  */

 #include <vnet/udp/udp.h>
 #include <vnet/ip/ip4_inlines.h>
 #include <vnet/ip/ip6_inlines.h>

 #define udp_node_index(node_id, is_ip4)                                       \
   ((is_ip4) ? udp4_##node_id##_node.index : udp6_##node_id##_node.index)

 typedef enum udp_output_next_
 {
   UDP_OUTPUT_NEXT_DROP,
   UDP_OUTPUT_NEXT_IP_LOOKUP,
   UDP_OUTPUT_N_NEXT
 } udp_output_next_t;

 #define foreach_udp4_output_next                                              \
   _ (DROP, "error-drop")                                                      \
   _ (IP_LOOKUP, "ip4-lookup")

 #define foreach_udp6_output_next                                              \
   _ (DROP, "error-drop")                                                      \
   _ (IP_LOOKUP, "ip6-lookup")

 static vlib_error_desc_t udp_output_error_counters[] = {
 #define udp_error(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s },
 #include <vnet/udp/udp_error.def>
 #undef udp_error
 };

 typedef struct udp_tx_trace_
 {
   udp_header_t udp_header;
   udp_connection_t udp_connection;
 } udp_tx_trace_t;

 static u8 *
 format_udp_tx_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_tx_trace_t *t = va_arg (*args, udp_tx_trace_t *);
   udp_connection_t *uc = &t->udp_connection;
   u32 indent = format_get_indent (s);

   s = format (s, "%U\n%U%U", format_udp_connection, uc, format_white_space,
 	      indent, format_udp_header, &t->udp_header, 128);

   return s;
 }

 static void
 udp46_output_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
 			  u32 *to_next, u32 n_bufs)
 {
   udp_connection_t *uc;
   udp_tx_trace_t *t;
   vlib_buffer_t *b;
   udp_header_t *uh;
   int i;

   for (i = 0; i < n_bufs; i++)
     {
       b = vlib_get_buffer (vm, to_next[i]);
       if (!(b->flags & VLIB_BUFFER_IS_TRACED))
 	continue;
       uh = vlib_buffer_get_current (b);
       uc = udp_connection_get (vnet_buffer (b)->tcp.connection_index,
 			       vm->thread_index);
       t = vlib_add_trace (vm, node, b, sizeof (*t));
       clib_memcpy_fast (&t->udp_header, uh, sizeof (t->udp_header));
       clib_memcpy_fast (&t->udp_connection, uc, sizeof (t->udp_connection));
     }
 }

 always_inline void
 udp_output_push_ip (vlib_main_t *vm, vlib_buffer_t *b, udp_connection_t *uc,
 		    u8 is_ip4)
 {
   if (uc->c_is_ip4)
     vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
 				 IP_PROTOCOL_UDP, 1 /* csum offload */,
 				 0 /* is_df */, uc->c_dscp);
   else
     vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
 			  IP_PROTOCOL_UDP);
   vnet_buffer (b)->sw_if_index[VLIB_RX] = uc->sw_if_index;
   vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
 }

 always_inline void
 udp_output_handle_packet (udp_connection_t *uc0, vlib_buffer_t *b0,
 			  vlib_node_runtime_t *error_node, u16 *next0,
 			  u8 is_ip4)
 {
   /* If next_index is not drop use it */
   if (uc0->next_node_index)
     {
       *next0 = uc0->next_node_index;
       vnet_buffer (b0)->tcp.next_node_opaque = uc0->next_node_opaque;
     }
   else
     {
       *next0 = UDP_OUTPUT_NEXT_IP_LOOKUP;
     }

   vnet_buffer (b0)->sw_if_index[VLIB_TX] = uc0->c_fib_index;
   vnet_buffer (b0)->sw_if_index[VLIB_RX] = uc0->sw_if_index;
 }

 always_inline uword
 udp46_output_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
 		     vlib_frame_t *frame, int is_ip4)
 {
   u32 n_left_from, *from, thread_index = vm->thread_index;
   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
   u16 nexts[VLIB_FRAME_SIZE], *next;

   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;

   if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
     udp46_output_trace_frame (vm, node, from, n_left_from);

   vlib_get_buffers (vm, from, bufs, n_left_from);
   b = bufs;
   next = nexts;

   while (n_left_from >= 4)
     {
       udp_connection_t *uc0, *uc1;

       vlib_prefetch_buffer_header (b[2], STORE);
       CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);

       vlib_prefetch_buffer_header (b[3], STORE);
       CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);

       uc0 = udp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
 				thread_index);
       uc1 = udp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
 				thread_index);

       if (PREDICT_TRUE (!uc0 + !uc1 == 0))
 	{
 	  udp_output_push_ip (vm, b[0], uc0, is_ip4);
 	  udp_output_push_ip (vm, b[1], uc1, is_ip4);

 	  udp_output_handle_packet (uc0, b[0], node, &next[0], is_ip4);
 	  udp_output_handle_packet (uc1, b[1], node, &next[1], is_ip4);
 	}
       else
 	{
 	  if (uc0 != 0)
 	    {
 	      udp_output_push_ip (vm, b[0], uc0, is_ip4);
 	      udp_output_handle_packet (uc0, b[0], node, &next[0], is_ip4);
 	    }
 	  else
 	    {
 	      b[0]->error = node->errors[UDP_ERROR_INVALID_CONNECTION];
 	      next[0] = UDP_OUTPUT_NEXT_DROP;
 	    }
 	  if (uc1 != 0)
 	    {
 	      udp_output_push_ip (vm, b[1], uc1, is_ip4);
 	      udp_output_handle_packet (uc1, b[1], node, &next[1], is_ip4);
 	    }
 	  else
 	    {
 	      b[1]->error = node->errors[UDP_ERROR_INVALID_CONNECTION];
 	      next[1] = UDP_OUTPUT_NEXT_DROP;
 	    }
 	}

       b += 2;
       next += 2;
       n_left_from -= 2;
     }
   while (n_left_from > 0)
     {
       udp_connection_t *uc0;

       if (n_left_from > 1)
 	{
 	  vlib_prefetch_buffer_header (b[1], STORE);
 	  CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
 	}

       uc0 = udp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
 				thread_index);

       if (PREDICT_TRUE (uc0 != 0))
 	{
 	  udp_output_push_ip (vm, b[0], uc0, is_ip4);
 	  udp_output_handle_packet (uc0, b[0], node, &next[0], is_ip4);
 	}
       else
 	{
 	  b[0]->error = node->errors[UDP_ERROR_INVALID_CONNECTION];
 	  next[0] = UDP_OUTPUT_NEXT_DROP;
 	}

       b += 1;
       next += 1;
       n_left_from -= 1;
     }

   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
   vlib_node_increment_counter (vm, udp_node_index (output, is_ip4),
 			       UDP_ERROR_PKTS_SENT, frame->n_vectors);
   return frame->n_vectors;
 }

 VLIB_NODE_FN (udp4_output_node)
 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
 {
   return udp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */);
 }

 VLIB_NODE_FN (udp6_output_node)
 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
 {
   return udp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */);
 }

 VLIB_REGISTER_NODE (udp4_output_node) =
 {
   .name = "udp4-output",
   .vector_size = sizeof (u32),
   .n_errors = UDP_N_ERROR,
   .protocol_hint = VLIB_NODE_PROTO_HINT_UDP,
   .error_counters = udp_output_error_counters,
   .n_next_nodes = UDP_OUTPUT_N_NEXT,
   .next_nodes = {
 #define _(s, n) [UDP_OUTPUT_NEXT_##s] = n,
     foreach_udp4_output_next
 #undef _
   },
   .format_buffer = format_udp_header,
   .format_trace = format_udp_tx_trace,
 };

 VLIB_REGISTER_NODE (udp6_output_node) =
 {
   .name = "udp6-output",
   .vector_size = sizeof (u32),
   .n_errors = UDP_N_ERROR,
   .protocol_hint = VLIB_NODE_PROTO_HINT_UDP,
   .error_counters = udp_output_error_counters,
   .n_next_nodes = UDP_OUTPUT_N_NEXT,
   .next_nodes = {
 #define _(s, n) [UDP_OUTPUT_NEXT_##s] = n,
     foreach_udp6_output_next
 #undef _
   },
   .format_buffer = format_udp_header,
   .format_trace = format_udp_tx_trace,
 };

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/* SPDX-License-Identifier: Apache-2.0
	* Copyright(c) 2022 Cisco Systems, Inc.
	*/

	#include <vnet/udp/udp.h>
	#include <vnet/ip/ip4_inlines.h>
	#include <vnet/ip/ip6_inlines.h>

	#define udp_node_index(node_id, is_ip4) \
	((is_ip4) ? udp4_##node_id##_node.index : udp6_##node_id##_node.index)

	typedef enum udp_output_next_
	{
	UDP_OUTPUT_NEXT_DROP,
	UDP_OUTPUT_NEXT_IP_LOOKUP,
	UDP_OUTPUT_N_NEXT
	} udp_output_next_t;

	#define foreach_udp4_output_next \
	_ (DROP, "error-drop") \
	_ (IP_LOOKUP, "ip4-lookup")

	#define foreach_udp6_output_next \
	_ (DROP, "error-drop") \
	_ (IP_LOOKUP, "ip6-lookup")

	static vlib_error_desc_t udp_output_error_counters[] = {
	#define udp_error(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s },
	#include <vnet/udp/udp_error.def>
	#undef udp_error
	};

	typedef struct udp_tx_trace_
	{
	udp_header_t udp_header;
	udp_connection_t udp_connection;
	} udp_tx_trace_t;

	static u8 *
	format_udp_tx_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_tx_trace_t t = va_arg (args, udp_tx_trace_t *);
	udp_connection_t *uc = &t->udp_connection;
	u32 indent = format_get_indent (s);

	s = format (s, "%U\n%U%U", format_udp_connection, uc, format_white_space,
	indent, format_udp_header, &t->udp_header, 128);

	return s;
	}

	static void
	udp46_output_trace_frame (vlib_main_t vm, vlib_node_runtime_t node,
	u32 *to_next, u32 n_bufs)
	{
	udp_connection_t *uc;
	udp_tx_trace_t *t;
	vlib_buffer_t *b;
	udp_header_t *uh;
	int i;

	for (i = 0; i < n_bufs; i++)
	{
	b = vlib_get_buffer (vm, to_next[i]);
	if (!(b->flags & VLIB_BUFFER_IS_TRACED))
	continue;
	uh = vlib_buffer_get_current (b);
	uc = udp_connection_get (vnet_buffer (b)->tcp.connection_index,
	vm->thread_index);
	t = vlib_add_trace (vm, node, b, sizeof (*t));
	clib_memcpy_fast (&t->udp_header, uh, sizeof (t->udp_header));
	clib_memcpy_fast (&t->udp_connection, uc, sizeof (t->udp_connection));
	}
	}

	always_inline void
	udp_output_push_ip (vlib_main_t vm, vlib_buffer_t b, udp_connection_t *uc,
	u8 is_ip4)
	{
	if (uc->c_is_ip4)
	vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
	IP_PROTOCOL_UDP, 1 /* csum offload */,
	0 /* is_df */, uc->c_dscp);
	else
	vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
	IP_PROTOCOL_UDP);
	vnet_buffer (b)->sw_if_index[VLIB_RX] = uc->sw_if_index;
	vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
	}

	always_inline void
	udp_output_handle_packet (udp_connection_t uc0, vlib_buffer_t b0,
	vlib_node_runtime_t error_node, u16 next0,
	u8 is_ip4)
	{
	/* If next_index is not drop use it */
	if (uc0->next_node_index)
	{
	*next0 = uc0->next_node_index;
	vnet_buffer (b0)->tcp.next_node_opaque = uc0->next_node_opaque;
	}
	else
	{
	*next0 = UDP_OUTPUT_NEXT_IP_LOOKUP;
	}

	vnet_buffer (b0)->sw_if_index[VLIB_TX] = uc0->c_fib_index;
	vnet_buffer (b0)->sw_if_index[VLIB_RX] = uc0->sw_if_index;
	}

	always_inline uword
	udp46_output_inline (vlib_main_t vm, vlib_node_runtime_t node,
	vlib_frame_t *frame, int is_ip4)
	{
	u32 n_left_from, *from, thread_index = vm->thread_index;
	vlib_buffer_t bufs[VLIB_FRAME_SIZE], *b;
	u16 nexts[VLIB_FRAME_SIZE], *next;

	from = vlib_frame_vector_args (frame);
	n_left_from = frame->n_vectors;

	if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
	udp46_output_trace_frame (vm, node, from, n_left_from);

	vlib_get_buffers (vm, from, bufs, n_left_from);
	b = bufs;
	next = nexts;

	while (n_left_from >= 4)
	{
	udp_connection_t uc0, uc1;

	vlib_prefetch_buffer_header (b[2], STORE);
	CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);

	vlib_prefetch_buffer_header (b[3], STORE);
	CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);

	uc0 = udp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
	thread_index);
	uc1 = udp_connection_get (vnet_buffer (b[1])->tcp.connection_index,
	thread_index);

	if (PREDICT_TRUE (!uc0 + !uc1 == 0))
	{
	udp_output_push_ip (vm, b[0], uc0, is_ip4);
	udp_output_push_ip (vm, b[1], uc1, is_ip4);

	udp_output_handle_packet (uc0, b[0], node, &next[0], is_ip4);
	udp_output_handle_packet (uc1, b[1], node, &next[1], is_ip4);
	}
	else
	{
	if (uc0 != 0)
	{
	udp_output_push_ip (vm, b[0], uc0, is_ip4);
	udp_output_handle_packet (uc0, b[0], node, &next[0], is_ip4);
	}
	else
	{
	b[0]->error = node->errors[UDP_ERROR_INVALID_CONNECTION];
	next[0] = UDP_OUTPUT_NEXT_DROP;
	}
	if (uc1 != 0)
	{
	udp_output_push_ip (vm, b[1], uc1, is_ip4);
	udp_output_handle_packet (uc1, b[1], node, &next[1], is_ip4);
	}
	else
	{
	b[1]->error = node->errors[UDP_ERROR_INVALID_CONNECTION];
	next[1] = UDP_OUTPUT_NEXT_DROP;
	}
	}

	b += 2;
	next += 2;
	n_left_from -= 2;
	}
	while (n_left_from > 0)
	{
	udp_connection_t *uc0;

	if (n_left_from > 1)
	{
	vlib_prefetch_buffer_header (b[1], STORE);
	CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
	}

	uc0 = udp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
	thread_index);

	if (PREDICT_TRUE (uc0 != 0))
	{
	udp_output_push_ip (vm, b[0], uc0, is_ip4);
	udp_output_handle_packet (uc0, b[0], node, &next[0], is_ip4);
	}
	else
	{
	b[0]->error = node->errors[UDP_ERROR_INVALID_CONNECTION];
	next[0] = UDP_OUTPUT_NEXT_DROP;
	}

	b += 1;
	next += 1;
	n_left_from -= 1;
	}

	vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
	vlib_node_increment_counter (vm, udp_node_index (output, is_ip4),
	UDP_ERROR_PKTS_SENT, frame->n_vectors);
	return frame->n_vectors;
	}

	VLIB_NODE_FN (udp4_output_node)
	(vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)
	{
	return udp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */);
	}

	VLIB_NODE_FN (udp6_output_node)
	(vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)
	{
	return udp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */);
	}

	VLIB_REGISTER_NODE (udp4_output_node) =
	{
	.name = "udp4-output",
	.vector_size = sizeof (u32),
	.n_errors = UDP_N_ERROR,
	.protocol_hint = VLIB_NODE_PROTO_HINT_UDP,
	.error_counters = udp_output_error_counters,
	.n_next_nodes = UDP_OUTPUT_N_NEXT,
	.next_nodes = {
	#define _(s, n) [UDP_OUTPUT_NEXT_##s] = n,
	foreach_udp4_output_next
	#undef _
	},
	.format_buffer = format_udp_header,
	.format_trace = format_udp_tx_trace,
	};

	VLIB_REGISTER_NODE (udp6_output_node) =
	{
	.name = "udp6-output",
	.vector_size = sizeof (u32),
	.n_errors = UDP_N_ERROR,
	.protocol_hint = VLIB_NODE_PROTO_HINT_UDP,
	.error_counters = udp_output_error_counters,
	.n_next_nodes = UDP_OUTPUT_N_NEXT,
	.next_nodes = {
	#define _(s, n) [UDP_OUTPUT_NEXT_##s] = n,
	foreach_udp6_output_next
	#undef _
	},
	.format_buffer = format_udp_header,
	.format_trace = format_udp_tx_trace,
	};

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