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/*
* Copyright (c) 2017-2019 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.
*/
/**
* @file base.h
* @brief Base hICN definitions.
*/
#ifndef HICN_BASE_H
#define HICN_BASE_H
#include "common.h"
/* Default header fields */
#define HICN_DEFAULT_TTL 254
typedef u32 hicn_faceid_t;
typedef u8 hicn_pathlabel_t;
typedef u32 hicn_lifetime_t;
#define HICN_MAX_LIFETIME HICN_MAX_LIFETIME_SCALED << HICN_MAX_LIFETIME_MULTIPLIER
#define HICN_MAX_LIFETIME_SCALED 0xFFFF
#define HICN_MAX_LIFETIME_MULTIPLIER 0xF /* 4 bits */
/**
* @brief hICN packet format type
*
* The hICN type represents the sequence of protocols that we can find in packet
* headers. They are represented as a quartet of u8 values, correponding to
* IANA protocol assignment, and read from right to left. This is done to
* faciliate decapsulation of packet header by simple shift/mask operations.
*
* For instance, an IPv6/TCP packet will be identified as :
* [IPPROTO_NONE, IPPROTO_NONE, IPPROTO_TCP, IPPROTO_IPV6]
*
* We expect four elements to be sufficient for most uses, the max being
* currently used by an hypothetical signed MAP-Me update :
* [IPPROTO_ICMPRD, IPPROTO_AH, IPPROTO_ICMP, IPPROTO_IPV6]
*/
typedef union
{
/** protocol layers representation */
struct
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
u8 l1; /**< First layer */
u8 l2; /**< Second layer */
u8 l3; /**< Third layer */
u8 l4; /**< Fourth layer */
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
u8 l4; /**< Fourth layer */
u8 l3; /**< Third layer */
u8 l2; /**< Second layer */
u8 l1; /**< First layer */
#else
#error "Unsupported endianness"
#endif
};
/** u32 representation */
u32 as_u32;
} hicn_type_t;
/* Common protocol layers */
#define HICN_TYPE_IPV4_TCP (hicn_type_t) {{ .l4 = IPPROTO_NONE, .l3 = IPPROTO_NONE, .l2 = IPPROTO_TCP, .l1 = IPPROTO_IP }}
#define HICN_TYPE_IPV4_ICMP (hicn_type_t) {{ .l4 = IPPROTO_NONE, .l3 = IPPROTO_NONE, .l2 = IPPROTO_ICMP, .l1 = IPPROTO_IP }}
#define HICN_TYPE_IPV6_TCP (hicn_type_t) {{ .l4 = IPPROTO_NONE, .l3 = IPPROTO_NONE, .l2 = IPPROTO_TCP, .l1 = IPPROTO_IPV6 }}
#define HICN_TYPE_IPV6_ICMP (hicn_type_t) {{ .l4 = IPPROTO_NONE, .l3 = IPPROTO_NONE, .l2 = IPPROTO_ICMPV6, .l1 = IPPROTO_IPV6 }}
/**
* @brief hICN Payload type
*
* This type distinguishes several types of data packet, which can either carry
* content data, or Manifest
*/
typedef enum
{
HPT_DATA = 0,
HPT_MANIFEST = 1,
HPT_UNSPEC = 999
} hicn_payload_type_t;
/**
* @brief Path label computations
*
* Path label is computed by accumulating the identifiers of successive output
* faces as a Data packet is traveling from its producer back to the consumer
* originating the Interest.
*
* NOTE: this computation is not (yet) part of the hICN specification.
*/
#define HICN_PATH_LABEL_MASK 0xF000 /* 1000 0000 0000 0000 */
#define HICN_PATH_LABEL_SIZE 8
/**
* @brief Path label update
* @param [in] current_label Current pathlabel
* @param [in] face_id The face identifier to combine into the path label
* @param [out] new_label Computed pathlabel
*
* This function updates the current_label based on the new face_id, and returns
*/
always_inline void
update_pathlabel (hicn_pathlabel_t current_label, hicn_faceid_t face_id,
hicn_pathlabel_t * new_label)
{
hicn_pathlabel_t pl_face_id =
(hicn_pathlabel_t) ((face_id & HICN_PATH_LABEL_MASK) >>
(16 - HICN_PATH_LABEL_SIZE));
*new_label =
((current_label << 1) | (current_label >> (HICN_PATH_LABEL_SIZE - 1))) ^
pl_face_id;
}
#endif /* HICN_BASE_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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