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, 237 insertions, 0 deletions

diff --git a/src/vnet/udp/udp_pg.c b/src/vnet/udp/udp_pg.c
new file mode 100644
index 00000000000..c9d8d38ca4a
--- /dev/null
+++ b/src/vnet/udp/udp_pg.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * ip/udp_pg: UDP packet-generator interface
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <vnet/pg/pg.h>
+#include <vnet/ip/ip.h>		/* for unformat_udp_udp_port */
+
+#define UDP_PG_EDIT_LENGTH (1 << 0)
+#define UDP_PG_EDIT_CHECKSUM (1 << 1)
+
+always_inline void
+udp_pg_edit_function_inline (pg_main_t * pg,
+			     pg_stream_t * s,
+			     pg_edit_group_t * g,
+			     u32 * packets, u32 n_packets, u32 flags)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  u32 ip_offset, udp_offset;
+
+  udp_offset = g->start_byte_offset;
+  ip_offset = (g - 1)->start_byte_offset;
+
+  while (n_packets >= 1)
+    {
+      vlib_buffer_t *p0;
+      ip4_header_t *ip0;
+      udp_header_t *udp0;
+      u32 udp_len0;
+
+      p0 = vlib_get_buffer (vm, packets[0]);
+      n_packets -= 1;
+      packets += 1;
+
+      ip0 = (void *) (p0->data + ip_offset);
+      udp0 = (void *) (p0->data + udp_offset);
+      udp_len0 = clib_net_to_host_u16 (ip0->length) - sizeof (ip0[0]);
+
+      if (flags & UDP_PG_EDIT_LENGTH)
+	udp0->length =
+	  clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm, p0)
+				- ip_offset);
+
+      /* Initialize checksum with header. */
+      if (flags & UDP_PG_EDIT_CHECKSUM)
+	{
+	  ip_csum_t sum0;
+
+	  sum0 = clib_mem_unaligned (&ip0->src_address, u64);
+
+	  sum0 = ip_csum_with_carry
+	    (sum0, clib_host_to_net_u32 (udp_len0 + (ip0->protocol << 16)));
+
+	  /* Invalidate possibly old checksum. */
+	  udp0->checksum = 0;
+
+	  sum0 =
+	    ip_incremental_checksum_buffer (vm, p0, udp_offset, udp_len0,
+					    sum0);
+
+	  sum0 = ~ip_csum_fold (sum0);
+
+	  /* Zero checksum means checksumming disabled. */
+	  sum0 = sum0 != 0 ? sum0 : 0xffff;
+
+	  udp0->checksum = sum0;
+	}
+    }
+}
+
+static void
+udp_pg_edit_function (pg_main_t * pg,
+		      pg_stream_t * s,
+		      pg_edit_group_t * g, u32 * packets, u32 n_packets)
+{
+  switch (g->edit_function_opaque)
+    {
+    case UDP_PG_EDIT_LENGTH:
+      udp_pg_edit_function_inline (pg, s, g, packets, n_packets,
+				   UDP_PG_EDIT_LENGTH);
+      break;
+
+    case UDP_PG_EDIT_CHECKSUM:
+      udp_pg_edit_function_inline (pg, s, g, packets, n_packets,
+				   UDP_PG_EDIT_CHECKSUM);
+      break;
+
+    case UDP_PG_EDIT_CHECKSUM | UDP_PG_EDIT_LENGTH:
+      udp_pg_edit_function_inline (pg, s, g, packets, n_packets,
+				   UDP_PG_EDIT_CHECKSUM | UDP_PG_EDIT_LENGTH);
+      break;
+
+    default:
+      ASSERT (0);
+      break;
+    }
+}
+
+typedef struct
+{
+  pg_edit_t src_port, dst_port;
+  pg_edit_t length;
+  pg_edit_t checksum;
+} pg_udp_header_t;
+
+static inline void
+pg_udp_header_init (pg_udp_header_t * p)
+{
+  /* Initialize fields that are not bit fields in the IP header. */
+#define _(f) pg_edit_init (&p->f, udp_header_t, f);
+  _(src_port);
+  _(dst_port);
+  _(length);
+  _(checksum);
+#undef _
+}
+
+uword
+unformat_pg_udp_header (unformat_input_t * input, va_list * args)
+{
+  pg_stream_t *s = va_arg (*args, pg_stream_t *);
+  pg_udp_header_t *p;
+  u32 group_index;
+
+  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (udp_header_t),
+			    &group_index);
+  pg_udp_header_init (p);
+
+  /* Defaults. */
+  p->checksum.type = PG_EDIT_UNSPECIFIED;
+  p->length.type = PG_EDIT_UNSPECIFIED;
+
+  if (!unformat (input, "UDP: %U -> %U",
+		 unformat_pg_edit,
+		 unformat_tcp_udp_port, &p->src_port,
+		 unformat_pg_edit, unformat_tcp_udp_port, &p->dst_port))
+    goto error;
+
+  /* Parse options. */
+  while (1)
+    {
+      if (unformat (input, "length %U",
+		    unformat_pg_edit, unformat_pg_number, &p->length))
+	;
+
+      else if (unformat (input, "checksum %U",
+			 unformat_pg_edit, unformat_pg_number, &p->checksum))
+	;
+
+      /* Can't parse input: try next protocol level. */
+      else
+	break;
+    }
+
+  {
+    ip_main_t *im = &ip_main;
+    u16 dst_port;
+    tcp_udp_port_info_t *pi;
+
+    pi = 0;
+    if (p->dst_port.type == PG_EDIT_FIXED)
+      {
+	dst_port = pg_edit_get_value (&p->dst_port, PG_EDIT_LO);
+	pi = ip_get_tcp_udp_port_info (im, dst_port);
+      }
+
+    if (pi && pi->unformat_pg_edit
+	&& unformat_user (input, pi->unformat_pg_edit, s))
+      ;
+
+    else if (!unformat_user (input, unformat_pg_payload, s))
+      goto error;
+
+    p = pg_get_edit_group (s, group_index);
+    if (p->checksum.type == PG_EDIT_UNSPECIFIED
+	|| p->length.type == PG_EDIT_UNSPECIFIED)
+      {
+	pg_edit_group_t *g = pg_stream_get_group (s, group_index);
+	g->edit_function = udp_pg_edit_function;
+	g->edit_function_opaque = 0;
+	if (p->checksum.type == PG_EDIT_UNSPECIFIED)
+	  g->edit_function_opaque |= UDP_PG_EDIT_CHECKSUM;
+	if (p->length.type == PG_EDIT_UNSPECIFIED)
+	  g->edit_function_opaque |= UDP_PG_EDIT_LENGTH;
+      }
+
+    return 1;
+  }
+
+error:
+  /* Free up any edits we may have added. */
+  pg_free_edit_group (s);
+  return 0;
+}
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */