src/vnet/ipip/node.c - fdio/vpp - Gitiles

 /*
  * 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 = vm->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:
  */
	/*
	* 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 = vm->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:
	*/