VPP-598: tcp stack initial commit

Change-Id: I49e5ce0aae6e4ff634024387ceaf7dbc432a0351
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 314 insertions, 0 deletions

diff --git a/src/vnet/udp/udp_input.c b/src/vnet/udp/udp_input.c
new file mode 100644
index 00000000000..4d509335c32
--- /dev/null
+++ b/src/vnet/udp/udp_input.c
@@ -0,0 +1,314 @@
+/*
+ * 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 <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/ip/ip.h>
+
+#include <vnet/udp/udp.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+#include <vnet/udp/udp_packet.h>
+
+#include <vlibmemory/api.h>
+#include "../session/application_interface.h"
+
+vlib_node_registration_t udp4_uri_input_node;
+
+typedef struct
+{
+  u32 session;
+  u32 disposition;
+  u32 thread_index;
+} udp4_uri_input_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_udp4_uri_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 *);
+  udp4_uri_input_trace_t *t = va_arg (*args, udp4_uri_input_trace_t *);
+
+  s = format (s, "UDP4_URI_INPUT: session %d, disposition %d, thread %d",
+	      t->session, t->disposition, t->thread_index);
+  return s;
+}
+
+typedef enum
+{
+  UDP4_URI_INPUT_NEXT_DROP,
+  UDP4_URI_INPUT_N_NEXT,
+} udp4_uri_input_next_t;
+
+static char *udp4_uri_input_error_strings[] = {
+#define _(sym,string) string,
+  foreach_session_input_error
+#undef _
+};
+
+static uword
+udp4_uri_input_node_fn (vlib_main_t * vm,
+			vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  u32 n_left_from, *from, *to_next;
+  udp4_uri_input_next_t next_index;
+  udp_uri_main_t *um = vnet_get_udp_main ();
+  session_manager_main_t *smm = vnet_get_session_manager_main ();
+  u32 my_thread_index = vm->cpu_index;
+  u8 my_enqueue_epoch;
+  u32 *session_indices_to_enqueue;
+  static u32 serial_number;
+  int i;
+
+  my_enqueue_epoch = ++smm->current_enqueue_epoch[my_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;
+	  vlib_buffer_t *b0;
+	  u32 next0 = UDP4_URI_INPUT_NEXT_DROP;
+	  u32 error0 = SESSION_ERROR_ENQUEUED;
+	  udp_header_t *udp0;
+	  ip4_header_t *ip0;
+	  stream_session_t *s0;
+	  svm_fifo_t *f0;
+	  u16 udp_len0;
+	  u8 *data0;
+
+	  /* 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));
+
+	  /* $$$$ fixme: udp_local doesn't do ip options correctly anyhow */
+	  ip0 = (ip4_header_t *) (((u8 *) udp0) - sizeof (*ip0));
+	  s0 = 0;
+
+	  /* lookup session */
+	  s0 = stream_session_lookup4 (&ip0->dst_address, &ip0->src_address,
+				       udp0->dst_port, udp0->src_port,
+				       SESSION_TYPE_IP4_UDP, my_thread_index);
+
+	  /* no listener */
+	  if (PREDICT_FALSE (s0 == 0))
+	    {
+	      error0 = SESSION_ERROR_NO_LISTENER;
+	      goto trace0;
+	    }
+
+	  f0 = s0->server_rx_fifo;
+
+	  /* established hit */
+	  if (PREDICT_TRUE (s0->session_state == SESSION_STATE_READY))
+	    {
+	      udp_len0 = clib_net_to_host_u16 (udp0->length);
+
+	      if (PREDICT_FALSE (udp_len0 > svm_fifo_max_enqueue (f0)))
+		{
+		  error0 = SESSION_ERROR_FIFO_FULL;
+		  goto trace0;
+		}
+
+	      svm_fifo_enqueue_nowait (f0, 0 /* pid */ ,
+				       udp_len0 - sizeof (*udp0),
+				       (u8 *) (udp0 + 1));
+
+	      b0->error = node->errors[SESSION_ERROR_ENQUEUED];
+
+	      /* We need to send an RX event on this fifo */
+	      if (s0->enqueue_epoch != my_enqueue_epoch)
+		{
+		  s0->enqueue_epoch = my_enqueue_epoch;
+
+		  vec_add1 (smm->session_indices_to_enqueue_by_thread
+			    [my_thread_index],
+			    s0 - smm->sessions[my_thread_index]);
+		}
+	    }
+	  /* listener hit */
+	  else if (s0->session_state == SESSION_STATE_LISTENING)
+	    {
+	      udp_connection_t *us;
+	      int rv;
+
+	      error0 = SESSION_ERROR_NOT_READY;
+
+	      /*
+	       * create udp transport session
+	       */
+	      pool_get (um->udp_sessions[my_thread_index], us);
+
+	      us->mtu = 1024;	/* $$$$ policy */
+
+	      us->c_lcl_ip4.as_u32 = ip0->dst_address.as_u32;
+	      us->c_rmt_ip4.as_u32 = ip0->src_address.as_u32;
+	      us->c_lcl_port = udp0->dst_port;
+	      us->c_rmt_port = udp0->src_port;
+	      us->c_proto = SESSION_TYPE_IP4_UDP;
+	      us->c_c_index = us - um->udp_sessions[my_thread_index];
+
+	      /*
+	       * create stream session and attach the udp session to it
+	       */
+	      rv = stream_session_accept (&us->connection, s0->session_index,
+					  SESSION_TYPE_IP4_UDP,
+					  1 /*notify */ );
+	      if (rv)
+		error0 = rv;
+
+	    }
+	  else
+	    {
+
+	      error0 = SESSION_ERROR_NOT_READY;
+	      goto trace0;
+	    }
+
+	trace0:
+	  b0->error = node->errors[error0];
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      udp4_uri_input_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+
+	      t->session = ~0;
+	      if (s0)
+		t->session = s0 - smm->sessions[my_thread_index];
+	      t->disposition = error0;
+	      t->thread_index = my_thread_index;
+	    }
+
+	  /* 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);
+    }
+
+  /* Send enqueue events */
+
+  session_indices_to_enqueue =
+    smm->session_indices_to_enqueue_by_thread[my_thread_index];
+
+  for (i = 0; i < vec_len (session_indices_to_enqueue); i++)
+    {
+      session_fifo_event_t evt;
+      unix_shared_memory_queue_t *q;
+      stream_session_t *s0;
+      application_t *server0;
+
+      /* Get session */
+      s0 = pool_elt_at_index (smm->sessions[my_thread_index],
+			      session_indices_to_enqueue[i]);
+
+      /* Get session's server */
+      server0 = application_get (s0->app_index);
+
+      /* Built-in server? Deliver the goods... */
+      if (server0->cb_fns.builtin_server_rx_callback)
+	{
+	  server0->cb_fns.builtin_server_rx_callback (s0);
+	  continue;
+	}
+
+      /* Fabricate event */
+      evt.fifo = s0->server_rx_fifo;
+      evt.event_type = FIFO_EVENT_SERVER_RX;
+      evt.event_id = serial_number++;
+      evt.enqueue_length = svm_fifo_max_dequeue (s0->server_rx_fifo);
+
+      /* Add event to server's event queue */
+      q = server0->event_queue;
+
+      /* Don't block for lack of space */
+      if (PREDICT_TRUE (q->cursize < q->maxsize))
+	unix_shared_memory_queue_add (server0->event_queue, (u8 *) & evt,
+				      0 /* do wait for mutex */ );
+      else
+	{
+	  vlib_node_increment_counter (vm, udp4_uri_input_node.index,
+				       SESSION_ERROR_FIFO_FULL, 1);
+	}
+      if (1)
+	{
+	  ELOG_TYPE_DECLARE (e) =
+	  {
+	  .format = "evt-enqueue: id %d length %d",.format_args = "i4i4",};
+	  struct
+	  {
+	    u32 data[2];
+	  } *ed;
+	  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
+	  ed->data[0] = evt.event_id;
+	  ed->data[1] = evt.enqueue_length;
+	}
+    }
+
+  vec_reset_length (session_indices_to_enqueue);
+
+  smm->session_indices_to_enqueue_by_thread[my_thread_index] =
+    session_indices_to_enqueue;
+
+  return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (udp4_uri_input_node) =
+{
+  .function = udp4_uri_input_node_fn,.name = "udp4-uri-input",.vector_size =
+    sizeof (u32),.format_trace = format_udp4_uri_input_trace,.type =
+    VLIB_NODE_TYPE_INTERNAL,.n_errors =
+    ARRAY_LEN (udp4_uri_input_error_strings),.error_strings =
+    udp4_uri_input_error_strings,.n_next_nodes = UDP4_URI_INPUT_N_NEXT,
+    /* edit / add dispositions here */
+    .next_nodes =
+  {
+  [UDP4_URI_INPUT_NEXT_DROP] = "error-drop",}
+,};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */