src/vnet/ip/ip.h - fdio/vpp - Gitiles

 /*
  * 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/ip.h: ip generic (4 or 6) main
  *
  * 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.
  */

 #ifndef included_ip_main_h
 #define included_ip_main_h

 #include <vppinfra/hash.h>
 #include <vppinfra/heap.h>	/* adjacency heap */
 #include <vppinfra/ptclosure.h>

 #include <vnet/vnet.h>

 #include <vnet/ip/ip_types.h>
 #include <vnet/ip/format.h>
 #include <vnet/ip/ip_packet.h>
 #include <vnet/ip/lookup.h>
 #include <vnet/ip/ip_interface.h>

 #include <vnet/tcp/tcp_packet.h>
 #include <vnet/udp/udp_packet.h>
 #include <vnet/ip/icmp46_packet.h>

 #include <vnet/ip/ip4.h>
 #include <vnet/ip/ip4_error.h>
 #include <vnet/ip/ip4_packet.h>
 #include <vnet/ip/icmp4.h>

 #include <vnet/ip/ip6.h>
 #include <vnet/ip/ip6_packet.h>
 #include <vnet/ip/ip6_error.h>
 #include <vnet/ip/icmp6.h>

 /* Per protocol info. */
 typedef struct
 {
   /* Protocol name (also used as hash key). */
   u8 *name;

   /* Protocol number. */
   ip_protocol_t protocol;

   /* Format function for this IP protocol. */
   format_function_t *format_header;

   /* Parser for header. */
   unformat_function_t *unformat_header;

   /* Parser for per-protocol matches. */
   unformat_function_t *unformat_match;

   /* Parser for packet generator edits for this protocol. */
   unformat_function_t *unformat_pg_edit;
 } ip_protocol_info_t;

 /* Per TCP/UDP port info. */
 typedef struct
 {
   /* Port name (used as hash key). */
   u8 *name;

   /* UDP/TCP port number in network byte order. */
   u16 port;

   /* Port specific format function. */
   format_function_t *format_header;

   /* Parser for packet generator edits for this protocol. */
   unformat_function_t *unformat_pg_edit;
 } tcp_udp_port_info_t;

 typedef struct
 {
   /* Per IP protocol info. */
   ip_protocol_info_t *protocol_infos;

   /* Protocol info index hashed by 8 bit IP protocol. */
   uword *protocol_info_by_protocol;

   /* Hash table mapping IP protocol name (see protocols.def)
      to protocol number. */
   uword *protocol_info_by_name;

   /* Per TCP/UDP port info. */
   tcp_udp_port_info_t *port_infos;

   /* Hash table from network-byte-order port to port info index. */
   uword *port_info_by_port;

   /* Hash table mapping TCP/UDP name to port info index. */
   uword *port_info_by_name;
 } ip_main_t;

 extern ip_main_t ip_main;

 clib_error_t *ip_main_init (vlib_main_t * vm);

 static inline ip_protocol_info_t *
 ip_get_protocol_info (ip_main_t * im, u32 protocol)
 {
   uword *p;

   p = hash_get (im->protocol_info_by_protocol, protocol);
   return p ? vec_elt_at_index (im->protocol_infos, p[0]) : 0;
 }

 static inline tcp_udp_port_info_t *
 ip_get_tcp_udp_port_info (ip_main_t * im, u32 port)
 {
   uword *p;

   p = hash_get (im->port_info_by_port, port);
   return p ? vec_elt_at_index (im->port_infos, p[0]) : 0;
 }

 always_inline ip_csum_t
 ip_incremental_checksum_buffer (vlib_main_t * vm,
 				vlib_buffer_t * first_buffer,
 				u32 first_buffer_offset,
 				u32 n_bytes_to_checksum, ip_csum_t sum)
 {
   vlib_buffer_t *b = first_buffer;
   u32 n_bytes_left = n_bytes_to_checksum;
   ASSERT (b->current_length >= first_buffer_offset);
   void *h;
   u32 n;

   n = clib_min (n_bytes_left, b->current_length - first_buffer_offset);
   h = vlib_buffer_get_current (b) + first_buffer_offset;
   sum = ip_incremental_checksum (sum, h, n);
   if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
     {
       while (1)
 	{
 	  n_bytes_left -= n;
 	  if (n_bytes_left == 0)
 	    break;
 	  b = vlib_get_buffer (vm, b->next_buffer);
 	  n = clib_min (n_bytes_left, b->current_length);
 	  h = vlib_buffer_get_current (b);
 	  sum = ip_incremental_checksum (sum, h, n);
 	}
     }

   return sum;
 }

 always_inline u16
 ip_calculate_l4_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
 			  ip_csum_t sum0, u32 payload_length,
 			  u8 * iph, u32 ip_header_size, u8 * l4h)
 {
   u16 sum16;
   u8 *data_this_buffer, length_odd;
   u32 n_bytes_left, n_this_buffer, n_ip_bytes_this_buffer;

   n_bytes_left = payload_length;

   if (l4h)			/* packet l4 header and no buffer chain involved */
     {
       ASSERT (p0 == NULL);
       n_this_buffer = payload_length;
       data_this_buffer = l4h;
     }
   else
     {
       ASSERT (p0);
       if (iph)			/* ip header pointer set to packet in buffer */
 	{
 	  ASSERT (ip_header_size);
 	  n_this_buffer = payload_length;
 	  data_this_buffer = iph + ip_header_size;	/* at l4 header */
 	  n_ip_bytes_this_buffer =
 	    p0->current_length - (((u8 *) iph - p0->data) - p0->current_data);
 	  if (PREDICT_FALSE (payload_length + ip_header_size >
 			     n_ip_bytes_this_buffer))
 	    {
 	      n_this_buffer = n_ip_bytes_this_buffer - ip_header_size;
 	      if (PREDICT_FALSE (n_this_buffer >> 31))
 		{		/*  error - ip header don't fit this buffer */
 		  return 0xfefe;
 		}
 	    }
 	}
       else			/* packet in buffer with no ip header  */
 	{			/* buffer current pointer at l4 header */
 	  n_this_buffer = p0->current_length;
 	  data_this_buffer = vlib_buffer_get_current (p0);
 	}
       n_this_buffer = clib_min (n_this_buffer, n_bytes_left);
     }

   while (1)
     {
       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
       n_bytes_left -= n_this_buffer;
       if (n_bytes_left == 0)
 	break;

       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
 	{
 	  return 0xfefe;
 	}

       length_odd = (n_this_buffer & 1);

       p0 = vlib_get_buffer (vm, p0->next_buffer);
       data_this_buffer = vlib_buffer_get_current (p0);
       n_this_buffer = clib_min (p0->current_length, n_bytes_left);

       if (PREDICT_FALSE (length_odd))
 	{
 	  /* Prepend a 0 byte to maintain 2-byte checksum alignment */
 	  data_this_buffer--;
 	  n_this_buffer++;
 	  n_bytes_left++;
 	  data_this_buffer[0] = 0;
 	}
     }

   sum16 = ~ip_csum_fold (sum0);
   return sum16;
 }

 void ip_del_all_interface_addresses (vlib_main_t * vm, u32 sw_if_index);

 extern vlib_node_registration_t ip4_inacl_node;
 extern vlib_node_registration_t ip6_inacl_node;

 void ip_table_create (fib_protocol_t fproto, u32 table_id, u8 is_api,
 		      const u8 * name);

 void ip_table_delete (fib_protocol_t fproto, u32 table_id, u8 is_api);

 int ip_table_bind (fib_protocol_t fproto, u32 sw_if_index,
 		   u32 table_id, u8 is_api);

 u8 ip_is_zero (ip46_address_t * ip46_address, u8 is_ip4);
 u8 ip_is_local_host (ip46_address_t * ip46_address, u8 is_ip4);
 u8 ip4_is_local_host (ip4_address_t * ip4_address);
 u8 ip6_is_local_host (ip6_address_t * ip6_address);
 u8 ip_is_local (u32 fib_index, ip46_address_t * ip46_address, u8 is_ip4);
 void ip_copy (ip46_address_t * dst, ip46_address_t * src, u8 is_ip4);
 void ip_set (ip46_address_t * dst, void *src, u8 is_ip4);

 void ip_feature_enable_disable (ip_address_family_t af,
 				ip_sub_address_family_t safi,
 				ip_feature_location_t loc,
 				const char *feature,
 				u32 sw_if_index, int enable_disable,
 				void *feature_config,
 				u32 n_feature_config_bytes);

 always_inline u32 vlib_buffer_get_ip4_fib_index (vlib_buffer_t * b);
 always_inline u32 vlib_buffer_get_ip6_fib_index (vlib_buffer_t * b);
 always_inline u32
 vlib_buffer_get_ip_fib_index (vlib_buffer_t * b, u8 is_ip4)
 {
   return (is_ip4 ? vlib_buffer_get_ip4_fib_index
 	  : vlib_buffer_get_ip6_fib_index) (b);
 }

 #endif /* included_ip_main_h */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* 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/ip.h: ip generic (4 or 6) main
	*
	* 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.
	*/

	#ifndef included_ip_main_h
	#define included_ip_main_h

	#include <vppinfra/hash.h>
	#include <vppinfra/heap.h> /* adjacency heap */
	#include <vppinfra/ptclosure.h>

	#include <vnet/vnet.h>

	#include <vnet/ip/ip_types.h>
	#include <vnet/ip/format.h>
	#include <vnet/ip/ip_packet.h>
	#include <vnet/ip/lookup.h>
	#include <vnet/ip/ip_interface.h>

	#include <vnet/tcp/tcp_packet.h>
	#include <vnet/udp/udp_packet.h>
	#include <vnet/ip/icmp46_packet.h>

	#include <vnet/ip/ip4.h>
	#include <vnet/ip/ip4_error.h>
	#include <vnet/ip/ip4_packet.h>
	#include <vnet/ip/icmp4.h>

	#include <vnet/ip/ip6.h>
	#include <vnet/ip/ip6_packet.h>
	#include <vnet/ip/ip6_error.h>
	#include <vnet/ip/icmp6.h>

	/* Per protocol info. */
	typedef struct
	{
	/* Protocol name (also used as hash key). */
	u8 *name;

	/* Protocol number. */
	ip_protocol_t protocol;

	/* Format function for this IP protocol. */
	format_function_t *format_header;

	/* Parser for header. */
	unformat_function_t *unformat_header;

	/* Parser for per-protocol matches. */
	unformat_function_t *unformat_match;

	/* Parser for packet generator edits for this protocol. */
	unformat_function_t *unformat_pg_edit;
	} ip_protocol_info_t;

	/* Per TCP/UDP port info. */
	typedef struct
	{
	/* Port name (used as hash key). */
	u8 *name;

	/* UDP/TCP port number in network byte order. */
	u16 port;

	/* Port specific format function. */
	format_function_t *format_header;

	/* Parser for packet generator edits for this protocol. */
	unformat_function_t *unformat_pg_edit;
	} tcp_udp_port_info_t;

	typedef struct
	{
	/* Per IP protocol info. */
	ip_protocol_info_t *protocol_infos;

	/* Protocol info index hashed by 8 bit IP protocol. */
	uword *protocol_info_by_protocol;

	/* Hash table mapping IP protocol name (see protocols.def)
	to protocol number. */
	uword *protocol_info_by_name;

	/* Per TCP/UDP port info. */
	tcp_udp_port_info_t *port_infos;

	/* Hash table from network-byte-order port to port info index. */
	uword *port_info_by_port;

	/* Hash table mapping TCP/UDP name to port info index. */
	uword *port_info_by_name;
	} ip_main_t;

	extern ip_main_t ip_main;

	clib_error_t ip_main_init (vlib_main_t vm);

	static inline ip_protocol_info_t *
	ip_get_protocol_info (ip_main_t * im, u32 protocol)
	{
	uword *p;

	p = hash_get (im->protocol_info_by_protocol, protocol);
	return p ? vec_elt_at_index (im->protocol_infos, p[0]) : 0;
	}

	static inline tcp_udp_port_info_t *
	ip_get_tcp_udp_port_info (ip_main_t * im, u32 port)
	{
	uword *p;

	p = hash_get (im->port_info_by_port, port);
	return p ? vec_elt_at_index (im->port_infos, p[0]) : 0;
	}

	always_inline ip_csum_t
	ip_incremental_checksum_buffer (vlib_main_t * vm,
	vlib_buffer_t * first_buffer,
	u32 first_buffer_offset,
	u32 n_bytes_to_checksum, ip_csum_t sum)
	{
	vlib_buffer_t *b = first_buffer;
	u32 n_bytes_left = n_bytes_to_checksum;
	ASSERT (b->current_length >= first_buffer_offset);
	void *h;
	u32 n;

	n = clib_min (n_bytes_left, b->current_length - first_buffer_offset);
	h = vlib_buffer_get_current (b) + first_buffer_offset;
	sum = ip_incremental_checksum (sum, h, n);
	if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
	{
	while (1)
	{
	n_bytes_left -= n;
	if (n_bytes_left == 0)
	break;
	b = vlib_get_buffer (vm, b->next_buffer);
	n = clib_min (n_bytes_left, b->current_length);
	h = vlib_buffer_get_current (b);
	sum = ip_incremental_checksum (sum, h, n);
	}
	}

	return sum;
	}

	always_inline u16
	ip_calculate_l4_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
	ip_csum_t sum0, u32 payload_length,
	u8 * iph, u32 ip_header_size, u8 * l4h)
	{
	u16 sum16;
	u8 *data_this_buffer, length_odd;
	u32 n_bytes_left, n_this_buffer, n_ip_bytes_this_buffer;

	n_bytes_left = payload_length;

	if (l4h) /* packet l4 header and no buffer chain involved */
	{
	ASSERT (p0 == NULL);
	n_this_buffer = payload_length;
	data_this_buffer = l4h;
	}
	else
	{
	ASSERT (p0);
	if (iph) /* ip header pointer set to packet in buffer */
	{
	ASSERT (ip_header_size);
	n_this_buffer = payload_length;
	data_this_buffer = iph + ip_header_size; /* at l4 header */
	n_ip_bytes_this_buffer =
	p0->current_length - (((u8 *) iph - p0->data) - p0->current_data);
	if (PREDICT_FALSE (payload_length + ip_header_size >
	n_ip_bytes_this_buffer))
	{
	n_this_buffer = n_ip_bytes_this_buffer - ip_header_size;
	if (PREDICT_FALSE (n_this_buffer >> 31))
	{ /* error - ip header don't fit this buffer */
	return 0xfefe;
	}
	}
	}
	else /* packet in buffer with no ip header */
	{ /* buffer current pointer at l4 header */
	n_this_buffer = p0->current_length;
	data_this_buffer = vlib_buffer_get_current (p0);
	}
	n_this_buffer = clib_min (n_this_buffer, n_bytes_left);
	}

	while (1)
	{
	sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
	n_bytes_left -= n_this_buffer;
	if (n_bytes_left == 0)
	break;

	if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
	{
	return 0xfefe;
	}

	length_odd = (n_this_buffer & 1);

	p0 = vlib_get_buffer (vm, p0->next_buffer);
	data_this_buffer = vlib_buffer_get_current (p0);
	n_this_buffer = clib_min (p0->current_length, n_bytes_left);

	if (PREDICT_FALSE (length_odd))
	{
	/* Prepend a 0 byte to maintain 2-byte checksum alignment */
	data_this_buffer--;
	n_this_buffer++;
	n_bytes_left++;
	data_this_buffer[0] = 0;
	}
	}

	sum16 = ~ip_csum_fold (sum0);
	return sum16;
	}

	void ip_del_all_interface_addresses (vlib_main_t * vm, u32 sw_if_index);

	extern vlib_node_registration_t ip4_inacl_node;
	extern vlib_node_registration_t ip6_inacl_node;

	void ip_table_create (fib_protocol_t fproto, u32 table_id, u8 is_api,
	const u8 * name);

	void ip_table_delete (fib_protocol_t fproto, u32 table_id, u8 is_api);

	int ip_table_bind (fib_protocol_t fproto, u32 sw_if_index,
	u32 table_id, u8 is_api);

	u8 ip_is_zero (ip46_address_t * ip46_address, u8 is_ip4);
	u8 ip_is_local_host (ip46_address_t * ip46_address, u8 is_ip4);
	u8 ip4_is_local_host (ip4_address_t * ip4_address);
	u8 ip6_is_local_host (ip6_address_t * ip6_address);
	u8 ip_is_local (u32 fib_index, ip46_address_t * ip46_address, u8 is_ip4);
	void ip_copy (ip46_address_t * dst, ip46_address_t * src, u8 is_ip4);
	void ip_set (ip46_address_t * dst, void *src, u8 is_ip4);

	void ip_feature_enable_disable (ip_address_family_t af,
	ip_sub_address_family_t safi,
	ip_feature_location_t loc,
	const char *feature,
	u32 sw_if_index, int enable_disable,
	void *feature_config,
	u32 n_feature_config_bytes);

	always_inline u32 vlib_buffer_get_ip4_fib_index (vlib_buffer_t * b);
	always_inline u32 vlib_buffer_get_ip6_fib_index (vlib_buffer_t * b);
	always_inline u32
	vlib_buffer_get_ip_fib_index (vlib_buffer_t * b, u8 is_ip4)
	{
	return (is_ip4 ? vlib_buffer_get_ip4_fib_index
	: vlib_buffer_get_ip6_fib_index) (b);
	}

	#endif /* included_ip_main_h */

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