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/*
* Copyright (c) 2021 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 __HICN_PARSER_H__
#define __HICN_PARSER_H__
#include <vlib/vlib.h>
#include "hicn.h"
#include "error.h"
/**
* @file parser.h
*/
/*
* Key type codes for header, header tlvs, body tlvs, and child tlvs
*/
// FIXME(reuse lib struct, no more control ?)
enum hicn_pkt_type_e
{
HICN_PKT_TYPE_INTEREST = 0,
HICN_PKT_TYPE_CONTENT = 1,
};
/**
* @brief Parse an interest packet
*
* @param pkt vlib buffer holding the interest
* @param name return variable that will point to the hicn name
* @param namelen return valiable that will hold the length of the name
* @param pkt_hdrp return valiable that will point to the packet header
* @param isv6 return variable that will be equale to 1 is the header is ipv6
*/
always_inline int
hicn_interest_parse_pkt (vlib_buffer_t *pkt, hicn_name_t *name, u16 *namelen,
hicn_header_t **pkt_hdrp, u8 *isv6)
{
if (pkt == NULL)
return HICN_ERROR_PARSER_PKT_INVAL;
hicn_header_t *pkt_hdr = vlib_buffer_get_current (pkt);
*pkt_hdrp = pkt_hdr;
u8 *ip_pkt = vlib_buffer_get_current (pkt);
*isv6 = hicn_is_v6 (pkt_hdr);
u8 ip_proto = (*isv6) * IPPROTO_IPV6;
u8 next_proto_offset = 6 + (1 - *isv6) * 3;
// in the ipv6 header the next header field is at byte 6
// in the ipv4 header the protocol field is at byte 9
hicn_type_t type =
(hicn_type_t){ { .l4 = IPPROTO_NONE,
.l3 = ip_pkt[next_proto_offset] == IPPROTO_UDP ?
IPPROTO_ENCAP :
IPPROTO_NONE,
.l2 = ip_pkt[next_proto_offset],
.l1 = ip_proto } };
hicn_get_buffer (pkt)->type = type;
hicn_ops_vft[type.l1]->get_interest_name (type, &pkt_hdr->protocol, name);
*namelen = (1 - (*isv6)) * HICN_V4_NAME_LEN + (*isv6) * HICN_V6_NAME_LEN;
return HICN_ERROR_NONE;
}
/**
* @brief Parse a data packet
*
* @param pkt vlib buffer holding the interest
* @param name return variable that will point to the hicn name
* @param namelen return valiable that will hold the length of the name
* @param pkt_hdrp return valiable that will point to the packet header
* @param isv6 return variable that will be equale to 1 is the header is ipv6
*/
always_inline int
hicn_data_parse_pkt (vlib_buffer_t *pkt, hicn_name_t *name, u16 *namelen,
hicn_header_t **pkt_hdrp, u8 *isv6)
{
if (pkt == NULL)
return HICN_ERROR_PARSER_PKT_INVAL;
hicn_header_t *pkt_hdr = vlib_buffer_get_current (pkt);
*pkt_hdrp = pkt_hdr;
*pkt_hdrp = pkt_hdr;
u8 *ip_pkt = vlib_buffer_get_current (pkt);
*isv6 = hicn_is_v6 (pkt_hdr);
u8 ip_proto = (*isv6) * IPPROTO_IPV6;
/*
* in the ipv6 header the next header field is at byte 6 in the ipv4
* header the protocol field is at byte 9
*/
u8 next_proto_offset = 6 + (1 - *isv6) * 3;
hicn_type_t type =
(hicn_type_t){ { .l4 = IPPROTO_NONE,
.l3 = ip_pkt[next_proto_offset] == IPPROTO_UDP ?
IPPROTO_ENCAP :
IPPROTO_NONE,
.l2 = ip_pkt[next_proto_offset],
.l1 = ip_proto } };
hicn_get_buffer (pkt)->type = type;
hicn_ops_vft[type.l1]->get_data_name (type, &pkt_hdr->protocol, name);
*namelen = (1 - (*isv6)) * HICN_V4_NAME_LEN + (*isv6) * HICN_V6_NAME_LEN;
return HICN_ERROR_NONE;
}
#endif /* // __HICN_PARSER_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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