tunnel_dp.h

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/*
 * tunnel_dp.h: data-plane functions tunnels.
 *
 * Copyright (c) 2019 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.
 */
 
#ifndef __TUNNEL_DP_H__
#define __TUNNEL_DP_H__
 
#include <vnet/tunnel/tunnel.h>
#include <vnet/mpls/mpls_lookup.h>
 
static_always_inline void
tunnel_encap_fixup_4o4 (tunnel_encap_decap_flags_t flags,
                        const ip4_header_t * inner, ip4_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP))
    ip4_header_set_dscp (outer, ip4_header_get_dscp (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN))
    ip4_header_set_ecn (outer, ip4_header_get_ecn (inner));
  if (PREDICT_FALSE ((flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DF) &&
                     ip4_header_get_df (inner)))
    ip4_header_set_df (outer);
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_HOP_LIMIT))
    ip4_header_set_ttl (outer, ip4_header_get_ttl (inner));
}
 
static_always_inline void
tunnel_encap_fixup_4o4_w_chksum (tunnel_encap_decap_flags_t flags,
                                 const ip4_header_t * inner,
                                 ip4_header_t * outer)
{
  if (PREDICT_FALSE (flags & (TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP |
                              TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)))
    {
      ip_csum_t sum = outer->checksum;
      u8 tos = outer->tos;
 
      if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
        ip4_header_set_dscp (outer, ip4_header_get_dscp (inner));
      if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)
        ip4_header_set_ecn (outer, ip4_header_get_ecn (inner));
 
      sum =
        ip_csum_update (outer->checksum, tos, outer->tos, ip4_header_t, tos);
      outer->checksum = ip_csum_fold (sum);
    }
  if (PREDICT_FALSE ((flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DF) &&
                     ip4_header_get_df (inner)))
    {
      ip_csum_t sum = outer->checksum;
      u16 tos = outer->flags_and_fragment_offset;
 
      ip4_header_set_df (outer);
 
      sum =
        ip_csum_update (outer->checksum, tos, outer->tos, ip4_header_t,
                        flags_and_fragment_offset);
      outer->checksum = ip_csum_fold (sum);
    }
}
 
static_always_inline void
tunnel_encap_fixup_mplso4_w_chksum (tunnel_encap_decap_flags_t flags,
                                    const mpls_unicast_header_t *inner,
                                    ip4_header_t *outer)
{
  if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
    {
      ip_csum_t sum = outer->checksum;
      u8 tos = outer->tos;
 
      if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
        ip4_header_set_dscp (outer,
                             vnet_mpls_uc_get_exp (inner->label_exp_s_ttl));
 
      sum =
        ip_csum_update (outer->checksum, tos, outer->tos, ip4_header_t, tos);
      outer->checksum = ip_csum_fold (sum);
    }
}
 
static_always_inline void
tunnel_encap_fixup_6o4 (tunnel_encap_decap_flags_t flags,
                        const ip6_header_t * inner, ip4_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP))
    ip4_header_set_dscp (outer, ip6_dscp_network_order (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN))
    ip4_header_set_ecn (outer, ip6_ecn_network_order ((inner)));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_HOP_LIMIT))
    ip4_header_set_ttl (outer, ip6_hop_limit_network_order (inner));
}
 
static_always_inline void
tunnel_encap_fixup_6o4_w_chksum (tunnel_encap_decap_flags_t flags,
                                 const ip6_header_t * inner,
                                 ip4_header_t * outer)
{
  if (PREDICT_FALSE (flags & (TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP |
                              TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)))
    {
      ip_csum_t sum = outer->checksum;
      u8 tos = outer->tos;
 
      if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
        ip4_header_set_dscp (outer, ip6_dscp_network_order (inner));
      if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)
        ip4_header_set_ecn (outer, ip6_ecn_network_order ((inner)));
 
      sum =
        ip_csum_update (outer->checksum, tos, outer->tos, ip4_header_t, tos);
      outer->checksum = ip_csum_fold (sum);
    }
}
 
static_always_inline void
tunnel_encap_fixup_6o6 (tunnel_encap_decap_flags_t flags,
                        const ip6_header_t * inner, ip6_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP))
    ip6_set_dscp_network_order (outer, ip6_dscp_network_order (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN))
    ip6_set_ecn_network_order (outer, ip6_ecn_network_order (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_FLOW_LABEL))
    ip6_set_flow_label_network_order (outer,
                                      ip6_flow_label_network_order (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_HOP_LIMIT))
    ip6_set_hop_limit_network_order (outer,
                                     ip6_hop_limit_network_order (inner));
}
 
static_always_inline void
tunnel_encap_fixup_4o6 (tunnel_encap_decap_flags_t flags,
                        const vlib_buffer_t *b, const ip4_header_t *inner,
                        ip6_header_t *outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP))
    ip6_set_dscp_network_order (outer, ip4_header_get_dscp (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN))
    ip6_set_ecn_network_order (outer, ip4_header_get_ecn (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_HOP_LIMIT))
    ip6_set_hop_limit_network_order (outer, ip4_header_get_ttl (inner));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_FLOW_LABEL))
    ip6_set_flow_label_network_order (
      outer, (0 != vnet_buffer (b)->ip.flow_hash ?
                vnet_buffer (b)->ip.flow_hash :
                ip4_compute_flow_hash (inner, IP_FLOW_HASH_DEFAULT)));
}
 
static_always_inline void
tunnel_encap_fixup_mplso6 (tunnel_encap_decap_flags_t flags,
                           const vlib_buffer_t *b,
                           const mpls_unicast_header_t *inner,
                           ip6_header_t *outer)
{
  if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
    ip6_set_dscp_network_order (outer,
                                vnet_mpls_uc_get_exp (inner->label_exp_s_ttl));
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_FLOW_LABEL))
    ip6_set_flow_label_network_order (
      outer, (0 != vnet_buffer (b)->ip.flow_hash ?
                vnet_buffer (b)->ip.flow_hash :
                mpls_compute_flow_hash (inner, IP_FLOW_HASH_DEFAULT)));
}
 
static_always_inline void
tunnel_encap_fixup_mplso4 (tunnel_encap_decap_flags_t flags,
                           const mpls_unicast_header_t *inner,
                           ip4_header_t *outer)
{
  if (flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
    ip4_header_set_dscp (outer, vnet_mpls_uc_get_exp (inner->label_exp_s_ttl));
}
 
static_always_inline void
tunnel_decap_fixup_4o6 (tunnel_encap_decap_flags_t flags,
                        ip4_header_t * inner, const ip6_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_DECAP_COPY_ECN))
    ip4_header_set_ecn_w_chksum (inner, ip6_ecn_network_order (outer));
}
 
static_always_inline void
tunnel_decap_fixup_6o6 (tunnel_encap_decap_flags_t flags,
                        ip6_header_t * inner, const ip6_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_DECAP_COPY_ECN))
    ip6_set_ecn_network_order (inner, ip6_ecn_network_order (outer));
}
 
static_always_inline void
tunnel_decap_fixup_6o4 (tunnel_encap_decap_flags_t flags,
                        ip6_header_t * inner, const ip4_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_DECAP_COPY_ECN))
    ip6_set_ecn_network_order (inner, ip4_header_get_ecn (outer));
}
 
static_always_inline void
tunnel_decap_fixup_4o4 (tunnel_encap_decap_flags_t flags,
                        ip4_header_t * inner, const ip4_header_t * outer)
{
  if (PREDICT_FALSE (flags & TUNNEL_ENCAP_DECAP_FLAG_DECAP_COPY_ECN))
    ip4_header_set_ecn_w_chksum (inner, ip4_header_get_ecn (outer));
}
 
static_always_inline void
tunnel_decap_fixup_mplso6 (tunnel_encap_decap_flags_t flags,
                           mpls_unicast_header_t *inner,
                           const ip6_header_t *outer)
{
}
 
static_always_inline void
tunnel_decap_fixup_mplso4 (tunnel_encap_decap_flags_t flags,
                           mpls_unicast_header_t *inner,
                           const ip4_header_t *outer)
{
}
 
#endif
 
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */