/*
 * 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.
 */
/*
 * node.c: srp packet processing
 *
 * Copyright (c) 2011 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 <vlib/vlib.h>
#include <vnet/ip/ip_packet.h>	/* for ip_csum_fold */
#include <vnet/srp/srp.h>

srp_main_t srp_main;

typedef struct {
  u8 packet_data[32];
} srp_input_trace_t;

static u8 * format_srp_input_trace (u8 * s, va_list * va)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
  srp_input_trace_t * t = va_arg (*va, srp_input_trace_t *);

  s = format (s, "%U", format_srp_header, t->packet_data);

  return s;
}

typedef enum {
  SRP_INPUT_NEXT_ERROR,
  SRP_INPUT_NEXT_ETHERNET_INPUT,
  SRP_INPUT_NEXT_CONTROL,
  SRP_INPUT_N_NEXT,
} srp_input_next_t;

typedef struct {
  u8 next_index;
  u8 buffer_advance;
  u16 error;
} srp_input_disposition_t;

static srp_input_disposition_t srp_input_disposition_by_mode[8] = {
  [SRP_MODE_reserved0] = {
    .next_index = SRP_INPUT_NEXT_ERROR,
    .error = SRP_ERROR_UNKNOWN_MODE,
  },
  [SRP_MODE_reserved1] = {
    .next_index = SRP_INPUT_NEXT_ERROR,
    .error = SRP_ERROR_UNKNOWN_MODE,
  },
  [SRP_MODE_reserved2] = {
    .next_index = SRP_INPUT_NEXT_ERROR,
    .error = SRP_ERROR_UNKNOWN_MODE,
  },
  [SRP_MODE_reserved3] = {
    .next_index = SRP_INPUT_NEXT_ERROR,
    .error = SRP_ERROR_UNKNOWN_MODE,
  },
  [SRP_MODE_keep_alive] = {
    .next_index = SRP_INPUT_NEXT_ERROR,
    .error = SRP_ERROR_KEEP_ALIVE_DROPPED,
  },
  [SRP_MODE_data] = {
    .next_index = SRP_INPUT_NEXT_ETHERNET_INPUT,
    .buffer_advance = sizeof (srp_header_t),
  },
  [SRP_MODE_control_pass_to_host] = {
    .next_index = SRP_INPUT_NEXT_CONTROL,
  },
  [SRP_MODE_control_locally_buffered_for_host] = {
    .next_index = SRP_INPUT_NEXT_CONTROL,
  },
};

static uword
srp_input (vlib_main_tcommit b163bbb748...