src/vnet/ip/punt_node.c


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.. _vpp16.06:

###############################
Features for Release VPP 16.06
###############################

The FD.io Project, relentlessly focused on data IO speed and efficiency supporting the creation of high performance, flexible, and scalable software defined infrastructures, announces the availability of the community’s first software release (16.06).

In the four months since launching, FD.io has brought together more than 75 developers from 11 different companies including network operators, solution providers chip vendors, and network equipment vendors who are collaborating to enhance and innovate around the Vector Packet Processing (VPP) technology. The FD.io community has quickly formed to grow the number of projects from the initial VPP project to an additional 6 projects addressing a diverse set of requirements and usability across a variety of deployment environments.

The 16.06 release brings unprecedented performance: 480Gbps/200mpps with 8 million routes and 2k whitelist entries on standard high volume x86 servers.


Features
=========

In addition to the existing full suite of vswitch/vrouter features, the new 16.06 release adds:

* Enhanced Switching and Routing:
   - IPv6 Segment Routing multicast support
   - LISP xTR support
   - VXLAN over IPv6 underlay
   - Per interface whitelists
   - Shared adjacencies in FIB
* New and improved interface support:
   - Jumbo frame support for vhost-user
   - Netmap interface support
   - AF_Packet interface support
* Expanded and improved programmability:
   - Python API bindings
   - Enhanced JVPP Java API bindings
   - Debugging CLI
* Expanded Hardware and Software Support:
   - Support for ARM 32 targets including Rasberry Pi single-board computer
   - Support for DPDK 16.04
/*
 * 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.
 */

/**
 * @file
 * @brief Local TCP/IP stack punt infrastructure.
 *
 * Provides a set of VPP nodes together with the relevant APIs and CLI
 * commands in order to adjust and dispatch packets from the VPP data plane
 * to the local TCP/IP stack
 */

#include <vnet/ip/ip.h>
#include <vlib/vlib.h>
#include <vnet/ip/punt.h>
#include <vlib/unix/unix.h>

#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stdlib.h>

typedef enum
{
#define punt_error(n,s) PUNT_ERROR_##n,
#include <vnet/ip/punt_error.def>
#undef punt_error
  PUNT_N_ERROR,
} punt_error_t;

#define foreach_punt_next			\
  _ (PUNT4, "ip4-punt")                         \
  _ (PUNT6, "ip6-punt")

typedef enum
{
#define _(s,n) PUNT_NEXT_##s,
  foreach_punt_next
#undef _
    PUNT_N_NEXT,
} punt_next_t;

enum punt_socket_rx_next_e
{
  PUNT_SOCKET_RX_NEXT_INTERFACE_OUTPUT,
  PUNT_SOCKET_RX_NEXT_IP4_LOOKUP,
  PUNT_SOCKET_RX_NEXT_IP6_LOOKUP,
  PUNT_SOCKET_RX_N_NEXT
};

#define punt_next_punt(is_ip4) (is_ip4 ? PUNT_NEXT_PUNT4 : PUNT_NEXT_PUNT6)

/** @brief IPv4/IPv6 UDP punt node main loop.

    This is the main loop inline function for IPv4/IPv6 UDP punt
    transition node.

    @param vm vlib_main_t corresponding to the current thread
    @param node vlib_node_runtime_t
    @param frame vlib_frame_t whose contents should be dispatched
    @param is_ipv4 indicates if called for IPv4 or IPv6 node
*/
always_inline uword
udp46_punt_inline (vlib_main_t * vm,
		   vlib_node_runtime_t * node,
		   vlib_frame_t * from_frame, int is_ip4)
{
  u32 n_left_from, *from, *to_next;
  word advance;

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

  /* udp[46]_lookup hands us the data payload, not the IP header */
  if (is_ip4)
    advance = -(sizeof (ip4_header_t) + sizeof (udp_header_t));
  else
    advance = -(sizeof (ip6_header_t) + sizeof (udp_header_t));

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, punt_next_punt (is_ip4), to_next,
			   n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;

	  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);
	  vlib_buffer_advance (b0, advance);
	  b0->error = node->errors[PUNT_ERROR_UDP_PORT];
	}

      vlib_put_next_frame (vm, node, punt_next_punt (is_ip4), n_left_to_next);
    }

  return from_frame->n_vectors;
}

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

/** @brief IPv4 UDP punt node.
    @node ip4-udp-punt

    This is the IPv4 UDP punt transition node. It is registered as a next
    node for the "ip4-udp-lookup" handling UDP port(s) requested for punt.
    The buffer's current data pointer is adjusted to the original packet
    IPv4 header. All buffers are dispatched to "error-punt".

    @param vm vlib_main_t corresponding to the current thread
    @param node vlib_node_runtime_t
    @param frame vlib_frame_t whose contents should be dispatched

    @par Graph mechanics: next index usage

    @em Sets:
    - <code>vnet_buffer(b)->current_data</code>
    - <code>vnet_buffer(b)->current_len</code>

    <em>Next Index:</em>
    - Dispatches the packet to the "error-punt" node
*/
VLIB_NODE_FN (udp4_punt_node) (vlib_main_t * vm,
			       vlib_node_runtime_t * node,
			       vlib_frame_t * from_frame)
{
  return udp46_punt_inline (vm, node, from_frame, 1 /* is_ip4 */ );
}

/** @brief IPv6 UDP punt node.
    @node ip6-udp-punt

    This is the IPv6 UDP punt transition node. It is registered as a next
    node for the "ip6-udp-lookup" handling UDP port(s) requested for punt.
    The buffer's current data pointer is adjusted to the original packet
    IPv6 header. All buffers are dispatched to "error-punt".

    @param vm vlib_main_t corresponding to the current thread
    @param node vlib_node_runtime_t
    @param frame vlib_frame_t whose contents should be dispatched

    @par Graph mechanics: next index usage

    @em Sets:
    - <code>vnet_buffer(b)->current_data</code>
    - <code>vnet_buffer(b)->current_len</code>

    <em>Next Index:</em>
    - Dispatches the packet to the "error-punt" node
*/
VLIB_NODE_FN (udp6_punt_node) (vlib_main_t * vm,
			       vlib_node_runtime_t * node,
			       vlib_frame_t * from_frame)
{
  return udp46_punt_inline (vm, node, from_frame, 0 /* is_ip4 */ );
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (udp4_punt_node) = {
  .name = "ip4-udp-punt",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),

  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,

  .n_next_nodes = PUNT_N_NEXT,
  .next_nodes = {
#define _(s,n) [PUNT_NEXT_##s] = n,
     foreach_punt_next
#undef _
  },
};

VLIB_REGISTER_NODE (udp6_punt_node) = {
  .name = "ip6-udp-punt",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),

  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,

  .n_next_nodes = PUNT_N_NEXT,
  .next_nodes = {
#define _(s,n) [PUNT_NEXT_##s] = n,
     foreach_punt_next
#undef _
  },
};
/* *INDENT-ON* */

typedef struct
{
  punt_client_t client;
  u8 is_midchain;
  u8 packet_data[64];
} udp_punt_trace_t;

static u8 *
format_udp_punt_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_punt_trace_t *t = va_arg (*args, udp_punt_trace_t *);
  u32 indent = format_get_indent (s);
  s = format (s, "to: %s", t->client.caddr.sun_path);
  if (t->is_midchain)
    {
      s = format (s, "\n%U(buffer is part of chain)", format_white_space,
		  indent);
    }
  s = format (s, "\n%U%U", format_white_space, indent,
	      format_hex_bytes, t->packet_data, sizeof (t->packet_data));

  return s;
}

always_inline uword
punt_socket_inline (vlib_main_t * vm,
		    vlib_node_runtime_t * node,
		    vlib_frame_t * frame,
		    punt_type_t pt, ip_address_family_t af)
{
  u32 *buffers = vlib_frame_vector_args (frame);
  u32 thread_index = vm->thread_index;
  uword n_packets = frame->n_vectors;
  punt_main_t *pm = &punt_main;
  int i;

  punt_thread_data_t *ptd = &pm->thread_data[thread_index];
  u32 node_index = (AF_IP4 == af ?
		    udp4_punt_socket_node.index :
		    udp6_punt_socket_node.index);

  for (i = 0; i < n_packets; i++)
    {
      struct iovec *iov;
      vlib_buffer_t *b;
      uword l;
      punt_packetdesc_t packetdesc;
      punt_client_t *c;

      b = vlib_get_buffer (vm, buffers[i]);

      if (PUNT_TYPE_L4 == pt)
	{
	  /* Reverse UDP Punt advance */
	  udp_header_t *udp;
	  if (AF_IP4 == af)
	    {
	      vlib_buffer_advance (b, -(sizeof (ip4_header_t) +
					sizeof (udp_header_t)));
	      ip4_header_t *ip = vlib_buffer_get_current (b);
	      udp = (udp_header_t *) (ip + 1);
	    }
	  else
	    {
	      vlib_buffer_advance (b, -(sizeof (ip6_header_t) +
					sizeof (udp_header_t)));
	      ip6_header_t *ip = vlib_buffer_get_current (b);
	      udp = (udp_header_t *) (ip + 1);
	    }

	  /*
	   * Find registerered client
	   * If no registered client, drop packet and count
	   */
	  c = punt_client_l4_get (af, clib_net_to_host_u16 (udp->dst_port));
	}
      else if (PUNT_TYPE_IP_PROTO == pt)
	{
	  /* Reverse UDP Punt advance */
	  ip_protocol_t proto;

	  if (AF_IP4 == af)
	    {
	      ip4_header_t *ip = vlib_buffer_get_current (b);
	      proto = ip->protocol;
	    }
	  else
	    {
	      ip6_header_t *ip = vlib_buffer_get_current (b);
	      proto = ip->protocol;
	    }

	  c = punt_client_ip_proto_get (af, proto);
	}
      else if (PUNT_TYPE_EXCEPTION == pt)
	{
	  c = punt_client_exception_get (b->punt_reason);
	}
      else
	c = NULL;

      if (PREDICT_FALSE (NULL == c))
	{
	  vlib_node_increment_counter (vm, node_index,
				       PUNT_ERROR_SOCKET_TX_ERROR, 1);
	  goto error;
	}

      struct sockaddr_un *caddr = &c->caddr;

      /* Re-set iovecs */
      vec_reset_length (ptd->iovecs);

      /* Add packet descriptor */
      packetdesc.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
      packetdesc.action = 0;
      vec_add2 (ptd->iovecs, iov, 1);
      iov->iov_base = &packetdesc;
      iov->iov_len = sizeof (packetdesc);

      /** VLIB buffer chain -> Unix iovec(s). */
      vlib_buffer_advance (b, -(sizeof (ethernet_header_t)));
      vec_add2 (ptd->iovecs, iov, 1);
      iov->iov_base = b->data + b->current_data;
      iov->iov_len = l = b->current_length;

      if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
	{
	  udp_punt_trace_t *t;
	  t = vlib_add_trace (vm, node, b, sizeof (t[0]));
	  clib_memcpy_fast (&t->client, c, sizeof (t->client));
	  clib_memcpy_fast (t->packet_data,
			    vlib_buffer_get_current (b),
			    sizeof (t->packet_data));
	}

      if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
	{
	  do
	    {
	      b = vlib_get_buffer (vm, b->next_buffer);
	      if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
		{
		  udp_punt_trace_t *t;
		  t = vlib_add_trace (vm, node, b, sizeof (t[0]));
		  clib_memcpy_fast (&t->client, c, sizeof (t->client));
		  t->is_midchain = 1;
		}

	      vec_add2 (ptd->iovecs, iov, 1);

	      iov->iov_base = b->data + b->current_data;
	      iov->iov_len = b->current_length;
	      l += b->current_length;
	    }
	  while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
	}

      struct msghdr msg = {
	.msg_name = caddr,
	.msg_namelen = sizeof (*caddr),
	.msg_iov = ptd->iovecs,
	.msg_iovlen = vec_len (ptd->iovecs),
      };

      if (sendmsg (pm->socket_fd, &msg, 0) < (ssize_t) l)
	vlib_node_increment_counter (vm, node_index,
				     PUNT_ERROR_SOCKET_TX_ERROR, 1);
      else
	vlib_node_increment_counter (vm, node_index, PUNT_ERROR_SOCKET_TX, 1);
    }

error:
  vlib_buffer_free (vm, buffers, n_packets);

  return n_packets;
}

static uword
udp4_punt_socket (vlib_main_t * vm,
		  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
{
  return punt_socket_inline (vm, node, from_frame, PUNT_TYPE_L4, AF_IP4);
}

static uword
udp6_punt_socket (vlib_main_t * vm,
		  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
{
  return punt_socket_inline (vm, node, from_frame, PUNT_TYPE_L4, AF_IP6);
}

static uword
ip4_proto_punt_socket (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * from_frame)
{
  return punt_socket_inline (vm, node, from_frame,
			     PUNT_TYPE_IP_PROTO, AF_IP4);
}

static uword
ip6_proto_punt_socket (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * from_frame)
{
  return punt_socket_inline (vm, node, from_frame,
			     PUNT_TYPE_IP_PROTO, AF_IP6);
}

static uword
exception_punt_socket (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * from_frame)
{
  return punt_socket_inline (vm, node, from_frame,
			     PUNT_TYPE_EXCEPTION, AF_IP4);
}


/* *INDENT-OFF* */
VLIB_REGISTER_NODE (udp4_punt_socket_node) = {
  .function = udp4_punt_socket,
  .name = "ip4-udp-punt-socket",
  .format_trace = format_udp_punt_trace,
  .flags = VLIB_NODE_FLAG_IS_DROP,
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),
  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,
};
VLIB_REGISTER_NODE (udp6_punt_socket_node) = {
  .function = udp6_punt_socket,
  .name = "ip6-udp-punt-socket",
  .format_trace = format_udp_punt_trace,
  .flags = VLIB_NODE_FLAG_IS_DROP,
  .vector_size = sizeof (u32),
  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,
};
VLIB_REGISTER_NODE (ip4_proto_punt_socket_node) = {
  .function = ip4_proto_punt_socket,
  .name = "ip4-proto-punt-socket",
  .format_trace = format_udp_punt_trace,
  .flags = VLIB_NODE_FLAG_IS_DROP,
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),
  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,
};
VLIB_REGISTER_NODE (ip6_proto_punt_socket_node) = {
  .function = ip6_proto_punt_socket,
  .name = "ip6-proto-punt-socket",
  .format_trace = format_udp_punt_trace,
  .flags = VLIB_NODE_FLAG_IS_DROP,
  .vector_size = sizeof (u32),
  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,
};
VLIB_REGISTER_NODE (exception_punt_socket_node) = {
  .function = exception_punt_socket,
  .name = "exception-punt-socket",
  .format_trace = format_udp_punt_trace,
  .flags = VLIB_NODE_FLAG_IS_DROP,
  .vector_size = sizeof (u32),
  .n_errors = PUNT_N_ERROR,
  .error_strings = punt_error_strings,
};
/* *INDENT-ON* */

typedef struct
{
  enum punt_action_e action;
  u32 sw_if_index;
} punt_trace_t;

static u8 *
format_punt_trace (u8 * s, va_list * va)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
  vnet_main_t *vnm = vnet_get_main ();
  punt_trace_t *t = va_arg (*va, punt_trace_t *);
  s = format (s, "%U Action: %d", format_vnet_sw_if_index_name,
	      vnm, t->sw_if_index, t->action);
  return s;
}

static uword
punt_socket_rx_fd (vlib_main_t * vm, vlib_node_runtime_t * node, u32 fd)
{
  const uword buffer_size = vlib_buffer_get_default_data_size (vm);
  u32 n_trace = vlib_get_trace_count (vm, node);
  u32 next = node->cached_next_index;
  u32 n_left_to_next, next_index;
  u32 *to_next;
  u32 error = PUNT_ERROR_NONE;
  vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);

  /* $$$$ Only dealing with one buffer at the time for now */

  u32 bi;
  vlib_buffer_t *b;
  punt_packetdesc_t packetdesc;
  ssize_t size;
  struct iovec io[2];

  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
    {
      error = PUNT_ERROR_NOBUFFER;
      goto error;
    }

  b = vlib_get_buffer (vm, bi);
  io[0].iov_base = &packetdesc;
  io[0].iov_len = sizeof (packetdesc);
  io[1].iov_base = b->data;
  io[1].iov_len = buffer_size;

  size = readv (fd, io, 2);
  /* We need at least the packet descriptor plus a header */
  if (size <= (int) (sizeof (packetdesc) + sizeof (ip4_header_t)))
    {
      vlib_buffer_free (vm, &bi, 1);
      error = PUNT_ERROR_READV;
      goto error;
    }

  b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
  b->current_length = size - sizeof (packetdesc);

  switch (packetdesc.action)
    {
    case PUNT_L2:
      vnet_buffer (b)->sw_if_index[VLIB_TX] = packetdesc.sw_if_index;
      next_index = PUNT_SOCKET_RX_NEXT_INTERFACE_OUTPUT;
      break;

    case PUNT_IP4_ROUTED:
      vnet_buffer (b)->sw_if_index[VLIB_RX] = packetdesc.sw_if_index;
      vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
      next_index = PUNT_SOCKET_RX_NEXT_IP4_LOOKUP;
      break;

    case PUNT_IP6_ROUTED:
      vnet_buffer (b)->sw_if_index[VLIB_RX] = packetdesc.sw_if_index;
      vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
      next_index = PUNT_SOCKET_RX_NEXT_IP6_LOOKUP;
      break;

    default:
      error = PUNT_ERROR_ACTION;
      vlib_buffer_free (vm, &bi, 1);
      goto error;
    }

  if (PREDICT_FALSE
      (n_trace > 0
       && vlib_trace_buffer (vm, node, next_index, b, 1 /* follow_chain */ )))
    {
      punt_trace_t *t;
      vlib_set_trace_count (vm, node, --n_trace);
      t = vlib_add_trace (vm, node, b, sizeof (*t));
      t->sw_if_index = packetdesc.sw_if_index;
      t->action = packetdesc.action;
    }

  to_next[0] = bi;
  to_next++;
  n_left_to_next--;

  vlib_validate_buffer_enqueue_x1 (vm, node, next, to_next, n_left_to_next,
				   bi, next_index);
  vlib_put_next_frame (vm, node, next, n_left_to_next);

  return 1;

error:
  vlib_put_next_frame (vm, node, next, n_left_to_next);
  vlib_node_increment_counter (vm, punt_socket_rx_node.index, error, 1);
  return 0;
}

static uword
punt_socket_rx (vlib_main_t * vm,
		vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  punt_main_t *pm = &punt_main;
  u32 total_count = 0;
  int i;

  for (i = 0; i < vec_len (pm->ready_fds); i++)
    {
      total_count += punt_socket_rx_fd (vm, node, pm->ready_fds[i]);
      vec_del1 (pm->ready_fds, i);
    }
  return total_count;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (punt_socket_rx_node) =
{
 .function = punt_socket_rx,
 .name = "punt-socket-rx",
 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
 .type = VLIB_NODE_TYPE_INPUT,
 .state = VLIB_NODE_STATE_INTERRUPT,
 .vector_size = 1,
 .n_errors = PUNT_N_ERROR,
 .error_strings = punt_error_strings,
 .n_next_nodes = PUNT_SOCKET_RX_N_NEXT,
 .next_nodes = {
    [PUNT_SOCKET_RX_NEXT_INTERFACE_OUTPUT] = "interface-output",
    [PUNT_SOCKET_RX_NEXT_IP4_LOOKUP] = "ip4-lookup",
    [PUNT_SOCKET_RX_NEXT_IP6_LOOKUP] = "ip6-lookup",
  },
 .format_trace = format_punt_trace,
};
/* *INDENT-ON* */

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