interface_output.h

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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.
 */
/*
 * interface_output.c: interface output node
 *
 * 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 __INTERFACE_INLINES_H__
#define __INTERFACE_INLINES_H__

#include <vnet/vnet.h>
#include <vnet/gso/hdr_offset_parser.h>

static_always_inline void
vnet_calc_ip4_checksums (vlib_main_t * vm, vlib_buffer_t * b,
                         ip4_header_t * ip4, tcp_header_t * th,
                         udp_header_t * uh)
{
  if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
    ip4->checksum = ip4_header_checksum (ip4);
  if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
    {
      th->checksum = 0;
      th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
    }
  if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
    {
      uh->checksum = 0;
      uh->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
    }
}

static_always_inline void
vnet_calc_ip6_checksums (vlib_main_t * vm, vlib_buffer_t * b,
                         ip6_header_t * ip6, tcp_header_t * th,
                         udp_header_t * uh)
{
  int bogus;
  if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
    {
      th->checksum = 0;
      th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
    }
  if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
    {
      uh->checksum = 0;
      uh->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
    }
}

static_always_inline void
vnet_calc_checksums_inline (vlib_main_t * vm, vlib_buffer_t * b,
                            int is_ip4, int is_ip6, int with_gso)
{
  ip4_header_t *ip4;
  ip6_header_t *ip6;
  tcp_header_t *th;
  udp_header_t *uh;

  if (with_gso)
    {
      generic_header_offset_t gho = { 0 };
      vnet_generic_header_offset_parser (b, &gho, 1 /* l2 */ , is_ip4,
                                         is_ip6);

      ASSERT (gho.gho_flags ^ (GHO_F_IP4 | GHO_F_IP6));

      vnet_get_inner_header (b, &gho);

      ip4 = (ip4_header_t *)
        (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
      ip6 = (ip6_header_t *)
        (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
      th = (tcp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
      uh = (udp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);

      if (gho.gho_flags & GHO_F_IP4)
        {
          vnet_calc_ip4_checksums (vm, b, ip4, th, uh);
        }
      else if (gho.gho_flags & GHO_F_IP6)
        {
          vnet_calc_ip6_checksums (vm, b, ip6, th, uh);
        }

      vnet_get_outer_header (b, &gho);
    }
  else
    {
      ASSERT (!(is_ip4 && is_ip6));

      ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
      ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
      th = (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
      uh = (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);

      if (is_ip4)
        {
          vnet_calc_ip4_checksums (vm, b, ip4, th, uh);
        }
      if (is_ip6)
        {
          vnet_calc_ip6_checksums (vm, b, ip6, th, uh);
        }
    }
  b->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
  b->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
  b->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
}

#endif

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