src/vnet/ip/ip6_format.c - 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/ip6_format.c: ip6 formatting
  *
  * 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/ip/ip.h>

 /* Format an IP6 address. */
 u8 *
 format_ip6_address (u8 * s, va_list * args)
 {
   ip6_address_t *a = va_arg (*args, ip6_address_t *);
   u32 max_zero_run = 0, this_zero_run = 0;
   int max_zero_run_index = -1, this_zero_run_index = 0;
   int in_zero_run = 0, i;
   int last_double_colon = 0;

   /* Ugh, this is a pain. Scan forward looking for runs of 0's */
   for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
     {
       if (a->as_u16[i] == 0)
 	{
 	  if (in_zero_run)
 	    this_zero_run++;
 	  else
 	    {
 	      in_zero_run = 1;
 	      this_zero_run = 1;
 	      this_zero_run_index = i;
 	    }
 	}
       else
 	{
 	  if (in_zero_run)
 	    {
 	      /* offer to compress the biggest run of > 1 zero */
 	      if (this_zero_run > max_zero_run && this_zero_run > 1)
 		{
 		  max_zero_run_index = this_zero_run_index;
 		  max_zero_run = this_zero_run;
 		}
 	    }
 	  in_zero_run = 0;
 	  this_zero_run = 0;
 	}
     }

   if (in_zero_run)
     {
       if (this_zero_run > max_zero_run && this_zero_run > 1)
 	{
 	  max_zero_run_index = this_zero_run_index;
 	  max_zero_run = this_zero_run;
 	}
     }

   for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
     {
       if (i == max_zero_run_index)
 	{
 	  s = format (s, "::");
 	  i += max_zero_run - 1;
 	  last_double_colon = 1;
 	}
       else
 	{
 	  s = format (s, "%s%x",
 		      (last_double_colon || i == 0) ? "" : ":",
 		      clib_net_to_host_u16 (a->as_u16[i]));
 	  last_double_colon = 0;
 	}
     }

   return s;
 }

 /* Format an IP6 route destination and length. */
 u8 *
 format_ip6_address_and_length (u8 * s, va_list * args)
 {
   ip6_address_t *a = va_arg (*args, ip6_address_t *);
   u8 l = va_arg (*args, u32);
   return format (s, "%U/%d", format_ip6_address, a, l);
 }

 u8 *
 format_ip6_address_and_mask (u8 * s, va_list * args)
 {
   ip6_address_and_mask_t *am = va_arg (*args, ip6_address_and_mask_t *);

   if (am->addr.as_u64[0] == 0 && am->addr.as_u64[1] == 0 &&
       am->mask.as_u64[0] == 0 && am->mask.as_u64[1] == 0)
     return format (s, "any");

   if (am->mask.as_u64[0] == ~0 && am->mask.as_u64[1] == ~0)
     return format (s, "%U", format_ip4_address, &am->addr);

   return format (s, "%U/%U", format_ip6_address, &am->addr,
 		 format_ip4_address, &am->mask);
 }


 /* Parse an IP6 address. */
 uword
 unformat_ip6_address (unformat_input_t * input, va_list * args)
 {
   ip6_address_t *result = va_arg (*args, ip6_address_t *);
   u16 hex_quads[8];
   uword hex_quad, n_hex_quads, hex_digit, n_hex_digits;
   uword c, n_colon, double_colon_index;

   n_hex_quads = hex_quad = n_hex_digits = n_colon = 0;
   double_colon_index = ARRAY_LEN (hex_quads);
   while ((c = unformat_get_input (input)) != UNFORMAT_END_OF_INPUT)
     {
       hex_digit = 16;
       if (c >= '0' && c <= '9')
 	hex_digit = c - '0';
       else if (c >= 'a' && c <= 'f')
 	hex_digit = c + 10 - 'a';
       else if (c >= 'A' && c <= 'F')
 	hex_digit = c + 10 - 'A';
       else if (c == ':' && n_colon < 2)
 	n_colon++;
       else
 	{
 	  unformat_put_input (input);
 	  break;
 	}

       /* Too many hex quads. */
       if (n_hex_quads >= ARRAY_LEN (hex_quads))
 	return 0;

       if (hex_digit < 16)
 	{
 	  hex_quad = (hex_quad << 4) | hex_digit;

 	  /* Hex quad must fit in 16 bits. */
 	  if (n_hex_digits >= 4)
 	    return 0;

 	  n_colon = 0;
 	  n_hex_digits++;
 	}

       /* Save position of :: */
       if (n_colon == 2)
 	{
 	  /* More than one :: ? */
 	  if (double_colon_index < ARRAY_LEN (hex_quads))
 	    return 0;
 	  double_colon_index = n_hex_quads;
 	}

       if (n_colon > 0 && n_hex_digits > 0)
 	{
 	  hex_quads[n_hex_quads++] = hex_quad;
 	  hex_quad = 0;
 	  n_hex_digits = 0;
 	}
     }

   if (n_hex_digits > 0)
     hex_quads[n_hex_quads++] = hex_quad;

   {
     word i;

     /* Expand :: to appropriate number of zero hex quads. */
     if (double_colon_index < ARRAY_LEN (hex_quads))
       {
 	word n_zero = ARRAY_LEN (hex_quads) - n_hex_quads;

 	for (i = n_hex_quads - 1; i >= (signed) double_colon_index; i--)
 	  hex_quads[n_zero + i] = hex_quads[i];

 	for (i = 0; i < n_zero; i++)
 	  {
 	    ASSERT ((double_colon_index + i) < ARRAY_LEN (hex_quads));
 	    hex_quads[double_colon_index + i] = 0;
 	  }

 	n_hex_quads = ARRAY_LEN (hex_quads);
       }

     /* Too few hex quads given. */
     if (n_hex_quads < ARRAY_LEN (hex_quads))
       return 0;

     for (i = 0; i < ARRAY_LEN (hex_quads); i++)
       result->as_u16[i] = clib_host_to_net_u16 (hex_quads[i]);

     return 1;
   }
 }

 uword
 unformat_ip6_address_and_mask (unformat_input_t * input, va_list * args)
 {
   ip6_address_and_mask_t *am = va_arg (*args, ip6_address_and_mask_t *);
   ip6_address_t addr, mask;

   clib_memset (&addr, 0, sizeof (ip6_address_t));
   clib_memset (&mask, 0, sizeof (ip6_address_t));

   if (unformat (input, "any"))
     ;
   else if (unformat (input, "%U/%U", unformat_ip6_address, &addr,
 		     unformat_ip6_address, &mask))
     ;
   else if (unformat (input, "%U", unformat_ip6_address, &addr))
     mask.as_u64[0] = mask.as_u64[1] = ~0;
   else
     return 0;

   am->addr.as_u64[0] = addr.as_u64[0];
   am->addr.as_u64[1] = addr.as_u64[1];
   am->mask.as_u64[0] = mask.as_u64[0];
   am->mask.as_u64[1] = mask.as_u64[1];
   return 1;
 }

 /* Format an IP6 header. */
 u8 *
 format_ip6_header (u8 * s, va_list * args)
 {
   ip6_header_t *ip = va_arg (*args, ip6_header_t *);
   u32 max_header_bytes = va_arg (*args, u32);
   u32 i, ip_version, traffic_class, flow_label;
   u32 indent;

   /* Nothing to do. */
   if (max_header_bytes < sizeof (ip[0]))
     return format (s, "IP header truncated");

   indent = format_get_indent (s);
   indent += 2;

   s = format (s, "%U: %U -> %U",
 	      format_ip_protocol, ip->protocol,
 	      format_ip6_address, &ip->src_address,
 	      format_ip6_address, &ip->dst_address);

   i = clib_net_to_host_u32 (ip->ip_version_traffic_class_and_flow_label);
   ip_version = (i >> 28);
   traffic_class = (i >> 20) & 0xff;
   flow_label = i & pow2_mask (20);

   if (ip_version != 6)
     s = format (s, "\n%Uversion %d", format_white_space, indent, ip_version);

   s =
     format (s,
 	    "\n%Utos 0x%02x, flow label 0x%x, hop limit %d, payload length %d",
 	    format_white_space, indent, traffic_class, flow_label,
 	    ip->hop_limit, clib_net_to_host_u16 (ip->payload_length));

   /* Recurse into next protocol layer. */
   if (max_header_bytes != 0 && sizeof (ip[0]) < max_header_bytes)
     {
       ip_main_t *im = &ip_main;
       ip_protocol_info_t *pi = ip_get_protocol_info (im, ip->protocol);

       if (pi && pi->format_header)
 	s = format (s, "\n%U%U",
 		    format_white_space, indent - 2, pi->format_header,
 		    /* next protocol header */ (void *) (ip + 1),
 		    max_header_bytes - sizeof (ip[0]));
     }

   return s;
 }

 /* Parse an IP6 header. */
 uword
 unformat_ip6_header (unformat_input_t * input, va_list * args)
 {
   u8 **result = va_arg (*args, u8 **);
   ip6_header_t *ip;
   int old_length;

   /* Allocate space for IP header. */
   {
     void *p;

     old_length = vec_len (*result);
     vec_add2 (*result, p, sizeof (ip[0]));
     ip = p;
   }

   clib_memset (ip, 0, sizeof (ip[0]));
   ip->ip_version_traffic_class_and_flow_label =
     clib_host_to_net_u32 (6 << 28);

   if (!unformat (input, "%U: %U -> %U",
 		 unformat_ip_protocol, &ip->protocol,
 		 unformat_ip6_address, &ip->src_address,
 		 unformat_ip6_address, &ip->dst_address))
     return 0;

   /* Parse options. */
   while (1)
     {
       int i;

       if (unformat (input, "tos %U", unformat_vlib_number, &i))
 	ip->ip_version_traffic_class_and_flow_label |=
 	  clib_host_to_net_u32 ((i & 0xff) << 20);

       else if (unformat (input, "hop-limit %U", unformat_vlib_number, &i))
 	ip->hop_limit = i;

       /* Can't parse input: try next protocol level. */
       else
 	break;
     }

   /* Recurse into next protocol layer. */
   {
     ip_main_t *im = &ip_main;
     ip_protocol_info_t *pi = ip_get_protocol_info (im, ip->protocol);

     if (pi && pi->unformat_header)
       {
 	if (!unformat_user (input, pi->unformat_header, result))
 	  return 0;

 	/* Result may have moved. */
 	ip = (void *) *result + old_length;
       }
   }

   ip->payload_length =
     clib_host_to_net_u16 (vec_len (*result) - (old_length + sizeof (ip[0])));

   return 1;
 }

 /* Parse an IP46 address. */
 uword
 unformat_ip46_address (unformat_input_t * input, va_list * args)
 {
   ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
   ip46_type_t type = va_arg (*args, ip46_type_t);
   if ((type != IP46_TYPE_IP6) &&
       unformat (input, "%U", unformat_ip4_address, &ip46->ip4))
     {
       ip46_address_mask_ip4 (ip46);
       return 1;
     }
   else if ((type != IP46_TYPE_IP4) &&
 	   unformat (input, "%U", unformat_ip6_address, &ip46->ip6))
     {
       return 1;
     }
   return 0;
 }

 /* Format an IP46 address. */
 u8 *
 format_ip46_address (u8 * s, va_list * args)
 {
   ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
   ip46_type_t type = va_arg (*args, ip46_type_t);
   int is_ip4 = 1;

   switch (type)
     {
     case IP46_TYPE_ANY:
       is_ip4 = ip46_address_is_ip4 (ip46);
       break;
     case IP46_TYPE_IP4:
       is_ip4 = 1;
       break;
     case IP46_TYPE_IP6:
       is_ip4 = 0;
       break;
     }

   return is_ip4 ?
     format (s, "%U", format_ip4_address, &ip46->ip4) :
     format (s, "%U", format_ip6_address, &ip46->ip6);
 }

 /*
  * 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/ip6_format.c: ip6 formatting
	*
	* 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/ip/ip.h>

	/* Format an IP6 address. */
	u8 *
	format_ip6_address (u8 * s, va_list * args)
	{
	ip6_address_t a = va_arg (args, ip6_address_t *);
	u32 max_zero_run = 0, this_zero_run = 0;
	int max_zero_run_index = -1, this_zero_run_index = 0;
	int in_zero_run = 0, i;
	int last_double_colon = 0;

	/* Ugh, this is a pain. Scan forward looking for runs of 0's */
	for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
	{
	if (a->as_u16[i] == 0)
	{
	if (in_zero_run)
	this_zero_run++;
	else
	{
	in_zero_run = 1;
	this_zero_run = 1;
	this_zero_run_index = i;
	}
	}
	else
	{
	if (in_zero_run)
	{
	/* offer to compress the biggest run of > 1 zero */
	if (this_zero_run > max_zero_run && this_zero_run > 1)
	{
	max_zero_run_index = this_zero_run_index;
	max_zero_run = this_zero_run;
	}
	}
	in_zero_run = 0;
	this_zero_run = 0;
	}
	}

	if (in_zero_run)
	{
	if (this_zero_run > max_zero_run && this_zero_run > 1)
	{
	max_zero_run_index = this_zero_run_index;
	max_zero_run = this_zero_run;
	}
	}

	for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
	{
	if (i == max_zero_run_index)
	{
	s = format (s, "::");
	i += max_zero_run - 1;
	last_double_colon = 1;
	}
	else
	{
	s = format (s, "%s%x",
	(last_double_colon \|\| i == 0) ? "" : ":",
	clib_net_to_host_u16 (a->as_u16[i]));
	last_double_colon = 0;
	}
	}

	return s;
	}

	/* Format an IP6 route destination and length. */
	u8 *
	format_ip6_address_and_length (u8 * s, va_list * args)
	{
	ip6_address_t a = va_arg (args, ip6_address_t *);
	u8 l = va_arg (*args, u32);
	return format (s, "%U/%d", format_ip6_address, a, l);
	}

	u8 *
	format_ip6_address_and_mask (u8 * s, va_list * args)
	{
	ip6_address_and_mask_t am = va_arg (args, ip6_address_and_mask_t *);

	if (am->addr.as_u64[0] == 0 && am->addr.as_u64[1] == 0 &&
	am->mask.as_u64[0] == 0 && am->mask.as_u64[1] == 0)
	return format (s, "any");

	if (am->mask.as_u64[0] == ~0 && am->mask.as_u64[1] == ~0)
	return format (s, "%U", format_ip4_address, &am->addr);

	return format (s, "%U/%U", format_ip6_address, &am->addr,
	format_ip4_address, &am->mask);
	}


	/* Parse an IP6 address. */
	uword
	unformat_ip6_address (unformat_input_t * input, va_list * args)
	{
	ip6_address_t result = va_arg (args, ip6_address_t *);
	u16 hex_quads[8];
	uword hex_quad, n_hex_quads, hex_digit, n_hex_digits;
	uword c, n_colon, double_colon_index;

	n_hex_quads = hex_quad = n_hex_digits = n_colon = 0;
	double_colon_index = ARRAY_LEN (hex_quads);
	while ((c = unformat_get_input (input)) != UNFORMAT_END_OF_INPUT)
	{
	hex_digit = 16;
	if (c >= '0' && c <= '9')
	hex_digit = c - '0';
	else if (c >= 'a' && c <= 'f')
	hex_digit = c + 10 - 'a';
	else if (c >= 'A' && c <= 'F')
	hex_digit = c + 10 - 'A';
	else if (c == ':' && n_colon < 2)
	n_colon++;
	else
	{
	unformat_put_input (input);
	break;
	}

	/* Too many hex quads. */
	if (n_hex_quads >= ARRAY_LEN (hex_quads))
	return 0;

	if (hex_digit < 16)
	{
	hex_quad = (hex_quad << 4) \| hex_digit;

	/* Hex quad must fit in 16 bits. */
	if (n_hex_digits >= 4)
	return 0;

	n_colon = 0;
	n_hex_digits++;
	}

	/* Save position of :: */
	if (n_colon == 2)
	{
	/* More than one :: ? */
	if (double_colon_index < ARRAY_LEN (hex_quads))
	return 0;
	double_colon_index = n_hex_quads;
	}

	if (n_colon > 0 && n_hex_digits > 0)
	{
	hex_quads[n_hex_quads++] = hex_quad;
	hex_quad = 0;
	n_hex_digits = 0;
	}
	}

	if (n_hex_digits > 0)
	hex_quads[n_hex_quads++] = hex_quad;

	{
	word i;

	/* Expand :: to appropriate number of zero hex quads. */
	if (double_colon_index < ARRAY_LEN (hex_quads))
	{
	word n_zero = ARRAY_LEN (hex_quads) - n_hex_quads;

	for (i = n_hex_quads - 1; i >= (signed) double_colon_index; i--)
	hex_quads[n_zero + i] = hex_quads[i];

	for (i = 0; i < n_zero; i++)
	{
	ASSERT ((double_colon_index + i) < ARRAY_LEN (hex_quads));
	hex_quads[double_colon_index + i] = 0;
	}

	n_hex_quads = ARRAY_LEN (hex_quads);
	}

	/* Too few hex quads given. */
	if (n_hex_quads < ARRAY_LEN (hex_quads))
	return 0;

	for (i = 0; i < ARRAY_LEN (hex_quads); i++)
	result->as_u16[i] = clib_host_to_net_u16 (hex_quads[i]);

	return 1;
	}
	}

	uword
	unformat_ip6_address_and_mask (unformat_input_t * input, va_list * args)
	{
	ip6_address_and_mask_t am = va_arg (args, ip6_address_and_mask_t *);
	ip6_address_t addr, mask;

	clib_memset (&addr, 0, sizeof (ip6_address_t));
	clib_memset (&mask, 0, sizeof (ip6_address_t));

	if (unformat (input, "any"))
	;
	else if (unformat (input, "%U/%U", unformat_ip6_address, &addr,
	unformat_ip6_address, &mask))
	;
	else if (unformat (input, "%U", unformat_ip6_address, &addr))
	mask.as_u64[0] = mask.as_u64[1] = ~0;
	else
	return 0;

	am->addr.as_u64[0] = addr.as_u64[0];
	am->addr.as_u64[1] = addr.as_u64[1];
	am->mask.as_u64[0] = mask.as_u64[0];
	am->mask.as_u64[1] = mask.as_u64[1];
	return 1;
	}

	/* Format an IP6 header. */
	u8 *
	format_ip6_header (u8 * s, va_list * args)
	{
	ip6_header_t ip = va_arg (args, ip6_header_t *);
	u32 max_header_bytes = va_arg (*args, u32);
	u32 i, ip_version, traffic_class, flow_label;
	u32 indent;

	/* Nothing to do. */
	if (max_header_bytes < sizeof (ip[0]))
	return format (s, "IP header truncated");

	indent = format_get_indent (s);
	indent += 2;

	s = format (s, "%U: %U -> %U",
	format_ip_protocol, ip->protocol,
	format_ip6_address, &ip->src_address,
	format_ip6_address, &ip->dst_address);

	i = clib_net_to_host_u32 (ip->ip_version_traffic_class_and_flow_label);
	ip_version = (i >> 28);
	traffic_class = (i >> 20) & 0xff;
	flow_label = i & pow2_mask (20);

	if (ip_version != 6)
	s = format (s, "\n%Uversion %d", format_white_space, indent, ip_version);

	s =
	format (s,
	"\n%Utos 0x%02x, flow label 0x%x, hop limit %d, payload length %d",
	format_white_space, indent, traffic_class, flow_label,
	ip->hop_limit, clib_net_to_host_u16 (ip->payload_length));

	/* Recurse into next protocol layer. */
	if (max_header_bytes != 0 && sizeof (ip[0]) < max_header_bytes)
	{
	ip_main_t *im = &ip_main;
	ip_protocol_info_t *pi = ip_get_protocol_info (im, ip->protocol);

	if (pi && pi->format_header)
	s = format (s, "\n%U%U",
	format_white_space, indent - 2, pi->format_header,
	/* next protocol header / (void ) (ip + 1),
	max_header_bytes - sizeof (ip[0]));
	}

	return s;
	}

	/* Parse an IP6 header. */
	uword
	unformat_ip6_header (unformat_input_t * input, va_list * args)
	{
	u8 *result = va_arg (args, u8 **);
	ip6_header_t *ip;
	int old_length;

	/* Allocate space for IP header. */
	{
	void *p;

	old_length = vec_len (*result);
	vec_add2 (*result, p, sizeof (ip[0]));
	ip = p;
	}

	clib_memset (ip, 0, sizeof (ip[0]));
	ip->ip_version_traffic_class_and_flow_label =
	clib_host_to_net_u32 (6 << 28);

	if (!unformat (input, "%U: %U -> %U",
	unformat_ip_protocol, &ip->protocol,
	unformat_ip6_address, &ip->src_address,
	unformat_ip6_address, &ip->dst_address))
	return 0;

	/* Parse options. */
	while (1)
	{
	int i;

	if (unformat (input, "tos %U", unformat_vlib_number, &i))
	ip->ip_version_traffic_class_and_flow_label \|=
	clib_host_to_net_u32 ((i & 0xff) << 20);

	else if (unformat (input, "hop-limit %U", unformat_vlib_number, &i))
	ip->hop_limit = i;

	/* Can't parse input: try next protocol level. */
	else
	break;
	}

	/* Recurse into next protocol layer. */
	{
	ip_main_t *im = &ip_main;
	ip_protocol_info_t *pi = ip_get_protocol_info (im, ip->protocol);

	if (pi && pi->unformat_header)
	{
	if (!unformat_user (input, pi->unformat_header, result))
	return 0;

	/* Result may have moved. */
	ip = (void ) result + old_length;
	}
	}

	ip->payload_length =
	clib_host_to_net_u16 (vec_len (*result) - (old_length + sizeof (ip[0])));

	return 1;
	}

	/* Parse an IP46 address. */
	uword
	unformat_ip46_address (unformat_input_t * input, va_list * args)
	{
	ip46_address_t ip46 = va_arg (args, ip46_address_t *);
	ip46_type_t type = va_arg (*args, ip46_type_t);
	if ((type != IP46_TYPE_IP6) &&
	unformat (input, "%U", unformat_ip4_address, &ip46->ip4))
	{
	ip46_address_mask_ip4 (ip46);
	return 1;
	}
	else if ((type != IP46_TYPE_IP4) &&
	unformat (input, "%U", unformat_ip6_address, &ip46->ip6))
	{
	return 1;
	}
	return 0;
	}

	/* Format an IP46 address. */
	u8 *
	format_ip46_address (u8 * s, va_list * args)
	{
	ip46_address_t ip46 = va_arg (args, ip46_address_t *);
	ip46_type_t type = va_arg (*args, ip46_type_t);
	int is_ip4 = 1;

	switch (type)
	{
	case IP46_TYPE_ANY:
	is_ip4 = ip46_address_is_ip4 (ip46);
	break;
	case IP46_TYPE_IP4:
	is_ip4 = 1;
	break;
	case IP46_TYPE_IP6:
	is_ip4 = 0;
	break;
	}

	return is_ip4 ?
	format (s, "%U", format_ip4_address, &ip46->ip4) :
	format (s, "%U", format_ip6_address, &ip46->ip6);
	}

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