IPIP: Add IP{v4,v6} over IP{v4,v6} configured tunnel support.

Change-Id: I166301c9e2388bae5f70ec0179d663a2703e27f5
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 268 insertions, 0 deletions

diff --git a/src/vnet/ipip/node.c b/src/vnet/ipip/node.c
new file mode 100644
index 00000000000..f24ea97b2cd
--- /dev/null
+++ b/src/vnet/ipip/node.c
@@ -0,0 +1,268 @@
+/*
+ * node.c: ipip packet processing
+ *
+ * Copyright (c) 2018 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 aipiped 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/ipip/ipip.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/mpls/mpls.h>
+#include <vnet/pg/pg.h>
+#include <vppinfra/sparse_vec.h>
+
+#define foreach_ipip_input_next                                                \
+  _(PUNT, "error-punt")                                                        \
+  _(DROP, "error-drop")                                                        \
+  _(IP4_INPUT, "ip4-input")                                                    \
+  _(IP6_INPUT, "ip6-input")
+
+typedef enum
+{
+#define _(s, n) IPIP_INPUT_NEXT_##s,
+  foreach_ipip_input_next
+#undef _
+    IPIP_INPUT_N_NEXT,
+} ipip_input_next_t;
+
+typedef struct
+{
+  u32 tunnel_id;
+  u32 length;
+  ip46_address_t src;
+  ip46_address_t dst;
+  u8 is_ipv6;
+} ipip_rx_trace_t;
+
+u8 *
+format_ipip_rx_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 *);
+  ipip_rx_trace_t *t = va_arg (*args, ipip_rx_trace_t *);
+
+  s = format (s, "IPIP: tunnel %d len %d src %U dst %U", t->tunnel_id,
+	      clib_net_to_host_u16 (t->length), format_ip46_address, &t->src,
+	      IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY);
+  return s;
+}
+
+always_inline uword
+ipip_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+	    vlib_frame_t * from_frame, bool is_ipv6)
+{
+  ipip_main_t *gm = &ipip_main;
+  u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
+  u32 tunnel_sw_if_index = ~0;
+  u32 thread_index = vlib_get_thread_index ();
+  u32 len;
+  vnet_interface_main_t *im = &gm->vnet_main->interface_main;
+
+  from = vlib_frame_vector_args (from_frame);
+  n_left_from = from_frame->n_vectors;
+  next_index = node->cached_next_index;
+  while (n_left_from > 0)
+    {
+      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;
+	  ip4_header_t *ip40;
+	  ip6_header_t *ip60;
+	  u32 next0 = IPIP_INPUT_NEXT_DROP;
+	  ip46_address_t src0 = ip46_address_initializer, dst0 =
+	    ip46_address_initializer;
+	  ipip_transport_t transport0;
+	  u8 inner_protocol0;
+
+	  bi0 = to_next[0] = from[0];
+	  from += 1;
+	  n_left_from -= 1;
+	  to_next += 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+
+	  if (is_ipv6)
+	    {
+	      ip60 = vlib_buffer_get_current (b0);
+	      vlib_buffer_advance (b0, sizeof (*ip60));
+	      ip_set (&src0, &ip60->src_address, false);
+	      ip_set (&dst0, &ip60->dst_address, false);
+	      inner_protocol0 = ip60->protocol;
+	      transport0 = IPIP_TRANSPORT_IP6;
+	    }
+	  else
+	    {
+	      ip40 = vlib_buffer_get_current (b0);
+	      vlib_buffer_advance (b0, sizeof (*ip40));
+	      ip_set (&src0, &ip40->src_address, true);
+	      ip_set (&dst0, &ip40->dst_address, true);
+	      inner_protocol0 = ip40->protocol;
+	      transport0 = IPIP_TRANSPORT_IP4;
+	    }
+
+	  /*
+	   * Find tunnel. First a lookup for P2P tunnels, then a lookup
+	   * for multipoint tunnels
+	   */
+	  ipip_tunnel_key_t key0 = {.transport = transport0,
+	    .fib_index = vnet_buffer (b0)->ip.fib_index,
+	    .src = dst0,
+	    .dst = src0
+	  };
+	  ipip_tunnel_t *t0 = ipip_tunnel_db_find (&key0);
+	  if (!t0)
+	    {
+	      ip46_address_reset (&key0.dst);
+	      t0 = ipip_tunnel_db_find (&key0);
+	      if (!t0)
+		{
+		  next0 = IPIP_INPUT_NEXT_DROP;
+		  b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
+		  goto drop;
+		}
+	    }
+	  tunnel_sw_if_index = t0->sw_if_index;
+
+	  len = vlib_buffer_length_in_chain (vm, b0);
+	  vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+
+	  if (inner_protocol0 == IP_PROTOCOL_IPV6)
+	    next0 = IPIP_INPUT_NEXT_IP6_INPUT;
+	  else if (inner_protocol0 == IP_PROTOCOL_IP_IN_IP)
+	    next0 = IPIP_INPUT_NEXT_IP4_INPUT;
+
+	  if (!is_ipv6 && t0->mode == IPIP_MODE_6RD
+	      && t0->sixrd.security_check)
+	    {
+	      ip6_header_t *inner_ip60 = vlib_buffer_get_current (b0);
+	      if (sixrd_get_addr_net (t0, inner_ip60->src_address.as_u64[0])
+		  != ip40->src_address.as_u32)
+		{
+		  next0 = IPIP_INPUT_NEXT_DROP;
+		  b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
+		  goto drop;
+		}
+	    }
+
+	  vlib_increment_combined_counter (im->combined_sw_if_counters +
+					   VNET_INTERFACE_COUNTER_RX,
+					   thread_index, tunnel_sw_if_index,
+					   1 /* packets */ ,
+					   len /* bytes */ );
+
+	drop:
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      ipip_rx_trace_t *tr =
+		vlib_add_trace (vm, node, b0, sizeof (*tr));
+	      tr->tunnel_id = tunnel_sw_if_index;
+	      if (is_ipv6)
+		{
+		  tr->length = ip60->payload_length;
+		  tr->src.ip6.as_u64[0] = ip60->src_address.as_u64[0];
+		  tr->src.ip6.as_u64[1] = ip60->src_address.as_u64[1];
+		  tr->dst.ip6.as_u64[0] = ip60->dst_address.as_u64[0];
+		  tr->dst.ip6.as_u64[1] = ip60->dst_address.as_u64[1];
+		}
+	      else
+		{
+		  tr->length = ip40->length;
+		  tr->src.ip4.as_u32 = ip40->src_address.as_u32;
+		  tr->dst.ip4.as_u32 = ip40->dst_address.as_u32;
+		}
+	    }
+
+	  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);
+    }
+  vlib_node_increment_counter (vm,
+			       !is_ipv6 ? ipip4_input_node.index :
+			       ipip6_input_node.index, IPIP_ERROR_DECAP_PKTS,
+			       from_frame->n_vectors);
+  return from_frame->n_vectors;
+}
+
+static uword
+ipip4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+	     vlib_frame_t * from_frame)
+{
+  return ipip_input (vm, node, from_frame, /* is_ip6 */ false);
+}
+
+static uword
+ipip6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+	     vlib_frame_t * from_frame)
+{
+  return ipip_input (vm, node, from_frame, /* is_ip6 */ true);
+}
+
+static char *ipip_error_strings[] = {
+#define _(sym,string) string,
+  foreach_ipip_error
+#undef _
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE(ipip4_input_node) = {
+    .function = ipip4_input,
+    .name = "ipip4-input",
+    /* Takes a vector of packets. */
+    .vector_size = sizeof(u32),
+    .n_errors = IPIP_N_ERROR,
+    .error_strings = ipip_error_strings,
+    .n_next_nodes = IPIP_INPUT_N_NEXT,
+    .next_nodes =
+        {
+#define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
+            foreach_ipip_input_next
+#undef _
+        },
+    .format_trace = format_ipip_rx_trace,
+};
+
+VLIB_REGISTER_NODE(ipip6_input_node) = {
+    .function = ipip6_input,
+    .name = "ipip6-input",
+    /* Takes a vector of packets. */
+    .vector_size = sizeof(u32),
+    .n_errors = IPIP_N_ERROR,
+    .error_strings = ipip_error_strings,
+    .n_next_nodes = IPIP_INPUT_N_NEXT,
+    .next_nodes =
+        {
+#define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
+            foreach_ipip_input_next
+#undef _
+        },
+    .format_trace = format_ipip_rx_trace,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH(ipip4_input_node, ipip4_input)
+VLIB_NODE_FUNCTION_MULTIARCH(ipip6_input_node, ipip6_input)
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */