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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
*/
/**
* @brief Parse a interest packet
*
* @param pkt vlib buffer holding the interest
* @param name [RETURNED] variable that will point to the hicn name
* @param namelen [RETURNED] variable that will hold the length of the name
* @param port [RETURNED] variable that will hold the source port of the packet
* @param pkt_hdrp [RETURNED] valiable that will point to the packet header
* @param isv6 [RETURNED] variable that will be equale to 1 is the header is
* ipv6
*/
always_inline int
hicn_interest_parse_pkt (vlib_buffer_t *pkt)
{
if (pkt == NULL)
return HICN_ERROR_PARSER_PKT_INVAL;
int ret = HICN_LIB_ERROR_NONE;
hicn_header_t *pkt_hdr;
u8 *ip_pkt;
u8 ip_proto;
u8 next_proto_offset;
hicn_type_t type;
hicn_name_t *name;
u16 *port;
int isv6;
// start parsing first fields to get the protocols
pkt_hdr = vlib_buffer_get_current (pkt);
isv6 = hicn_is_v6 (pkt_hdr);
ip_pkt = vlib_buffer_get_current (pkt);
ip_proto = (1 - isv6) * IPPROTO_IP + (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
next_proto_offset = 6 + (1 - isv6) * 3;
// get type info
type.l4 = IPPROTO_NONE;
type.l3 =
ip_pkt[next_proto_offset] == IPPROTO_UDP ? IPPROTO_ENCAP : IPPROTO_NONE;
type.l2 = ip_pkt[next_proto_offset];
type.l1 = ip_proto;
// cache hicn packet type in opaque2
hicn_get_buffer (pkt)->type = type;
// get name and name length
name = &hicn_get_buffer (pkt)->name;
ret =
hicn_ops_vft[type.l1]->get_interest_name (type, &pkt_hdr->protocol, name);
if (PREDICT_FALSE (ret))
{
if (type.l2 == IPPROTO_ICMPV4 || type.l2 == IPPROTO_ICMPV6)
{
return HICN_ERROR_PARSER_MAPME_PACKET;
}
return HICN_ERROR_PARSER_PKT_INVAL;
}
// get source port
port = &hicn_get_buffer (pkt)->port;
hicn_ops_vft[type.l1]->get_source_port (type, &pkt_hdr->protocol, port);
if (PREDICT_FALSE (ret))
{
return HICN_ERROR_PARSER_PKT_INVAL;
}
return ret;
}
/**
* @brief Parse a data packet
*
* @param pkt vlib buffer holding the data
* @param name [RETURNED] variable that will point to the hicn name
* @param namelen [RETURNED] variable that will hold the length of the name
* @param port [RETURNED] variable that will hold the source port of the packet
* @param pkt_hdrp [RETURNED] valiable that will point to the packet header
* @param isv6 [RETURNED] variable that will be equale to 1 is the header is
* ipv6
*/
always_inline int
hicn_data_parse_pkt (vlib_buffer_t *pkt)
{
if (pkt == NULL)
return HICN_ERROR_PARSER_PKT_INVAL;
int ret = HICN_LIB_ERROR_NONE;
hicn_header_t *pkt_hdr;
u8 *ip_pkt;
u8 ip_proto;
int isv6;
u8 next_proto_offset;
hicn_type_t type;
hicn_name_t *name;
u16 *port;
// start parsing first fields to get the protocols
pkt_hdr = vlib_buffer_get_current (pkt);
isv6 = hicn_is_v6 (pkt_hdr);
ip_pkt = vlib_buffer_get_current (pkt);
ip_proto = (1 - isv6) * IPPROTO_IP + (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
next_proto_offset = 6 + (1 - isv6) * 3;
// get type info
type.l4 = IPPROTO_NONE;
type.l3 =
ip_pkt[next_proto_offset] == IPPROTO_UDP ? IPPROTO_ENCAP : IPPROTO_NONE;
type.l2 = ip_pkt[next_proto_offset];
type.l1 = ip_proto;
// cache hicn packet type in opaque2
hicn_get_buffer (pkt)->type = type;
// get name and name length
name = &hicn_get_buffer (pkt)->name;
ret = hicn_ops_vft[type.l1]->get_data_name (type, &pkt_hdr->protocol, name);
if (PREDICT_FALSE (ret))
{
if (type.l2 == IPPROTO_ICMPV4 || type.l2 == IPPROTO_ICMPV6)
{
return HICN_ERROR_PARSER_MAPME_PACKET;
}
return HICN_ERROR_PARSER_PKT_INVAL;
}
// get source port
port = &hicn_get_buffer (pkt)->port;
hicn_ops_vft[type.l1]->get_source_port (type, &pkt_hdr->protocol, port);
if (PREDICT_FALSE (ret))
{
return HICN_ERROR_PARSER_PKT_INVAL;
}
return ret;
}
#endif /* // __HICN_PARSER_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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