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/*
* Copyright (c) 2017 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 __included_nsh_md2_ioam_util_h__
#define __included_nsh_md2_ioam_util_h__
#include <lisp/lisp-gpe/lisp_gpe_packet.h>
#include <vnet/ip/ip.h>
#include <nsh/nsh.h>
#include <nsh/nsh-md2-ioam/nsh_md2_ioam.h>
#include <nsh/nsh_packet.h>
extern nsh_option_map_t *nsh_md2_lookup_option (u16 class, u8 type);
typedef struct
{
u8 trace_data[256];
} nsh_transit_trace_t;
always_inline void
nsh_md2_ioam_encap_decap_ioam_v4_one_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_buffer_t * b0,
u32 * next0, u32 drop_node_val,
u8 use_adj)
{
ip4_header_t *ip0;
udp_header_t *udp_hdr0;
lisp_gpe_header_t *lisp_gpe_hdr0;
nsh_base_header_t *nsh_hdr;
nsh_tlv_header_t *opt0;
nsh_tlv_header_t *limit0;
nsh_main_t *hm = &nsh_main;
nsh_option_map_t *nsh_option;
/* Populate the iOAM header */
ip0 = vlib_buffer_get_current (b0);
udp_hdr0 = (udp_header_t *) (ip0 + 1);
lisp_gpe_hdr0 = (lisp_gpe_header_t *) (udp_hdr0 + 1);
nsh_hdr = (nsh_base_header_t *) (lisp_gpe_hdr0 + 1);
opt0 = (nsh_tlv_header_t *) (nsh_hdr + 1);
limit0 =
(nsh_tlv_header_t *) ((u8 *) opt0 + (nsh_hdr->length * 4) -
sizeof (nsh_base_header_t));
/*
* Basic validity checks
*/
if ((nsh_hdr->length * 4) > clib_net_to_host_u16 (ip0->length))
{
*next0 = drop_node_val;
return;
}
if (nsh_hdr->md_type != 2)
{
*next0 = drop_node_val;
return;
}
/* Scan the set of h-b-h options, process ones that we understand */
while (opt0 < limit0)
{
u8 type0;
type0 = opt0->type;
switch (type0)
{
case 0: /* Pad1 */
opt0 = (nsh_tlv_header_t *) ((u8 *) opt0) + 1;
continue;
case 1: /* PadN */
break;
default:
nsh_option = nsh_md2_lookup_option (opt0->class, opt0->type);
if ((nsh_option != NULL) && (hm->options[nsh_option->option_id]))
{
if ((*hm->options[nsh_option->option_id]) (b0, opt0) < 0)
{
*next0 = drop_node_val;
return;
}
}
break;
}
opt0 =
(nsh_tlv_header_t *) (((u8 *) opt0) + opt0->length +
sizeof (nsh_tlv_header_t));
}
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
nsh_transit_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
clib_memcpy_fast (&(tr->trace_data), nsh_hdr, (nsh_hdr->length * 4));
}
return;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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