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/*
 * 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/ip4_fib.h: ip4 mtrie fib
 *
 * Copyright (c) 2012 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_ip4_fib_h
#define included_ip_ip4_fib_h

#include <vppinfra/cache.h>
#include <vppinfra/vector.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/ip4_packet.h>	/* for ip4_address_t */

/* ip4 fib leafs: 4 ply 8-8-8-8 mtrie.
   1 + 2*adj_index for terminal leaves.
   0 + 2*next_ply_index for non-terminals, i.e. PLYs
   1 => empty (adjacency index of zero is special miss adjacency). */
typedef u32 ip4_fib_mtrie_leaf_t;

#define IP4_FIB_MTRIE_LEAF_EMPTY (1 + 2*0)

/**
 * @brief the 16 way stride that is the top PLY of the mtrie
 * We do not maintain the count of 'real' leaves in this PLY, since
 * it is never removed. The FIB will destroy the mtrie and the ply once
 * the FIB is destroyed.
 */
#define PLY_16_SIZE (1<<16)
typedef struct ip4_fib_mtrie_16_ply_t_
{
  /**
   * The leaves/slots/buckets to be filed with leafs
   */
  union
  {
    ip4_fib_mtrie_leaf_t leaves[PLY_16_SIZE];

#ifdef CLIB_HAVE_VEC128
    u32x4 leaves_as_u32x4[PLY_16_SIZE / 4];
#endif
  };

  /**
   * Prefix length for terminal leaves.
   */
  u8 dst_address_bits_of_leaves[PLY_16_SIZE];
} ip4_fib_mtrie_16_ply_t;

/**
 * @brief One ply of the 4 ply mtrie fib.
 */
typedef struct ip4_fib_mtrie_8_ply_t_
{
  /**
   * The leaves/slots/buckets to be filed with leafs
   */
  union
  {
    ip4_fib_mtrie_leaf_t leaves[256];

#ifdef CLIB_HAVE_VEC128
    u32x4 leaves_as_u32x4[256 / 4];
#endif
  };

  /**
   * Prefix length for leaves/ply.
   */
  u8 dst_address_bits_of_leaves[256];

  /**
   * Number of non-empty leafs (whether terminal or not).
   */
  i32 n_non_empty_leafs;

  /**
   * The length of the ply's covering prefix. Also a measure of its depth
   * If a leaf in a slot has a mask length longer than this then it is
   * 'non-empty'. Otherwise it is the value of the cover.
   */
  i32 dst_address_bits_base;

  /* Pad to cache line boundary. */
  u8 pad[CLIB_CACHE_LINE_BYTES - 2 * sizeof (i32)];
}
ip4_fib_mtrie_8_ply_t;

STATIC_ASSERT (0 == sizeof (ip4_fib_mtrie_8_ply_t) % CLIB_CACHE_LINE_BYTES,
	       "IP4 Mtrie ply cache line");

/**
 * @brief The mutiway-TRIE.
 * There is no data associated with the mtrie apart from the top PLY
 */
typedef struct
{
  /**
   * Embed the PLY with the mtrie struct. This means that the Data-plane
   * 'get me the mtrie' returns the first ply, and not an indirect 'pointer'
   * to it. therefore no cacheline misses in the data-path.
   */
  ip4_fib_mtrie_16_ply_t root_ply;
} ip4_fib_mtrie_t;

/**
 * @brief Initialise an mtrie
 */
void ip4_mtrie_init (ip4_fib_mtrie_t * m);

/**
 * @brief Free an mtrie, It must be emty when free'd
 */
void ip4_mtrie_free (ip4_fib_mtrie_t * m);

/**
 * @brief Add a route/entry to the mtrie
 */
void ip4_fib_mtrie_route_add (ip4_fib_mtrie_t * m,
			      const ip4_address_t * dst_address,
			      u32 dst_address_length, u32 adj_index);
/**
 * @brief remove a route/entry to the mtrie
 */
void ip4_fib_mtrie_route_del (ip4_fib_mtrie_t * m,
			      const ip4_address_t * dst_address,
			      u32 dst_address_length,
			      u32 adj_index,
			      u32 cover_address_length, u32 cover_adj_index);

/**
 * @brief return the memory used by the table
 */
uword ip4_fib_mtrie_memory_usage (ip4_fib_mtrie_t * m);

/**
 * @brief Format/display the contents of the mtrie
 */
format_function_t format_ip4_fib_mtrie;

/**
 * @brief A global pool of 8bit stride plys
 */
extern ip4_fib_mtrie_8_ply_t *ip4_ply_pool;

/**
 * Is the leaf terminal (i.e. an LB index) or non-terminal (i.e. a PLY index)
 */
always_inline u32
ip4_fib_mtrie_leaf_is_terminal (ip4_fib_mtrie_leaf_t n)
{
  return n & 1;
}

/**
 * From the stored slot value extract the LB index value
 */
always_inline u32
ip4_fib_mtrie_leaf_get_adj_index (ip4_fib_mtrie_leaf_t n)
{
  ASSERT (ip4_fib_mtrie_leaf_is_terminal (n));
  return n >> 1;
}

/**
 * @brief Lookup step.  Processes 1 byte of 4 byte ip4 address.
 */
always_inline ip4_fib_mtrie_leaf_t
ip4_fib_mtrie_lookup_step (const ip4_fib_mtrie_t * m,
			   ip4_fib_mtrie_leaf_t current_leaf,
			   const ip4_address_t * dst_address,
			   u32 dst_address_byte_index)
{
  ip4_fib_mtrie_8_ply_t *ply;

  uword current_is_terminal = ip4_fib_mtrie_leaf_is_terminal (current_leaf);

  if (!current_is_terminal)
    {
      ply = ip4_ply_pool + (current_leaf >> 1);
      return (ply->leaves[dst_address->as_u8[dst_address_byte_index]]);
    }

  return current_leaf;
}

/**
 * @brief Lookup step number 1.  Processes 2 bytes of 4 byte ip4 address.
 */
always_inline ip4_fib_mtrie_leaf_t
ip4_fib_mtrie_lookup_step_one (const ip4_fib_mtrie_t * m,
			       const ip4_address_t * dst_address)
{
  ip4_fib_mtrie_leaf_t next_leaf;

  next_leaf = m->root_ply.leaves[dst_address->as_u16[0]];

  return next_leaf;
}

#endif /* included_ip_ip4_fib_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
an class="n">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); void fib_table_bind (fib_protocol_t fproto, u32 sw_if_index, u32 fib_index); void mfib_table_bind (fib_protocol_t fproto, u32 sw_if_index, u32 mfib_index); int ip_table_bind (fib_protocol_t fproto, u32 sw_if_index, u32 table_id); u32 ip_table_get_unused_id (fib_protocol_t fproto); 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); ethernet_type_t ip_address_family_to_ether_type (ip_address_family_t af); 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: */