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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 protocol/ipv4.c
* @brief hICN operations for IPv4 header
*
* NOTE: IPv4 options (affecting the header size) are currently not supported.
*/
#ifndef _WIN32
#include <arpa/inet.h>
#include <netinet/in.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <hicn/error.h>
#include <hicn/ops.h>
#include <hicn/common.h>
#include <hicn/header.h>
#include <hicn/protocol/ipv4.h>
int ipv4_get_payload_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * payload_length);
int
ipv4_init_packet_header (hicn_type_t type, hicn_protocol_t * h)
{
size_t total_header_length;
int rc =
hicn_ops_vft[type.l1]->get_header_length (type, h, &total_header_length);
if (rc < 0)
return rc;
h->ipv4 = (_ipv4_header_t)
{
.version_ihl =
(IPV4_DEFAULT_VERSION << 4) | (0x0f & IPV4_DEFAULT_IHL),.tos =
IPV4_DEFAULT_TOS,.len = htons ((u16) total_header_length),.id =
htons (IPV4_DEFAULT_ID),.frag_off =
htons (IPV4_DEFAULT_FRAG_OFF),.ttl = HICN_DEFAULT_TTL,.protocol =
type.l2,.csum = 0,.saddr.as_u32 = 0,.daddr.as_u32 = 0,};
return CHILD_OPS (init_packet_header, type, h);
}
int
ipv4_get_interest_locator (hicn_type_t type, const hicn_protocol_t * h,
ip46_address_t * ip_address)
{
ip_address->ip4 = h->ipv4.saddr;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_set_interest_locator (hicn_type_t type, hicn_protocol_t * h,
const ip46_address_t * ip_address)
{
h->ipv4.saddr = ip_address->ip4;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_interest_name (hicn_type_t type, const hicn_protocol_t * h,
hicn_name_t * name)
{
name->prefix.ip4.as_u32 = h->ipv4.daddr.as_u32;
return CHILD_OPS (get_interest_name_suffix, type, h, &(name->suffix));
}
int
ipv4_set_interest_name (hicn_type_t type, hicn_protocol_t * h,
const hicn_name_t * name)
{
h->ipv4.daddr.as_u32 = name->prefix.ip4.as_u32;
return CHILD_OPS (set_interest_name_suffix, type, h, &(name->suffix));
}
int
ipv4_get_interest_name_suffix (hicn_type_t type, const hicn_protocol_t * h,
hicn_name_suffix_t * suffix)
{
return CHILD_OPS (get_interest_name_suffix, type, h, suffix);
}
int
ipv4_set_interest_name_suffix (hicn_type_t type, hicn_protocol_t * h,
const hicn_name_suffix_t * suffix)
{
return CHILD_OPS (set_interest_name_suffix, type, h, suffix);
}
int
ipv4_mark_packet_as_interest (hicn_type_t type, hicn_protocol_t * h)
{
return CHILD_OPS (mark_packet_as_interest, type, h);
}
int
ipv4_mark_packet_as_data (hicn_type_t type, hicn_protocol_t * h)
{
return CHILD_OPS (mark_packet_as_data, type, h);
}
int
ipv4_test_packet_is_interest (hicn_type_t type, hicn_protocol_t * h, u8 *ret)
{
return CHILD_OPS (test_packet_is_interest, type, h, ret);
}
int
ipv4_reset_interest_for_hash (hicn_type_t type, hicn_protocol_t * h)
{
/* Sets everything to 0 up to IP destination address */
memset (&(h->ipv4), 0, 16);
return CHILD_OPS (reset_interest_for_hash, type, h);
}
int
ipv4_get_data_locator (hicn_type_t type, const hicn_protocol_t * h,
ip46_address_t * ip_address)
{
ip_address->ip4 = h->ipv4.daddr;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_set_data_locator (hicn_type_t type, hicn_protocol_t * h,
const ip46_address_t * ip_address)
{
h->ipv4.daddr = ip_address->ip4;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_data_name (hicn_type_t type, const hicn_protocol_t * h,
hicn_name_t * name)
{
name->prefix.ip4.as_u32 = h->ipv4.saddr.as_u32;
return CHILD_OPS (get_data_name_suffix, type, h, &(name->suffix));
}
int
ipv4_set_data_name (hicn_type_t type, hicn_protocol_t * h,
const hicn_name_t * name)
{
h->ipv4.saddr.as_u32 = name->prefix.ip4.as_u32;
return CHILD_OPS (set_data_name_suffix, type, h, &(name->suffix));
}
int
ipv4_get_data_name_suffix (hicn_type_t type, const hicn_protocol_t * h,
hicn_name_suffix_t * suffix)
{
return CHILD_OPS (get_data_name_suffix, type, h, suffix);
}
int
ipv4_set_data_name_suffix (hicn_type_t type, hicn_protocol_t * h,
const hicn_name_suffix_t * suffix)
{
return CHILD_OPS (set_data_name_suffix, type, h, suffix);
}
int
ipv4_get_data_pathlabel (hicn_type_t type, const hicn_protocol_t * h,
u32 * pathlabel)
{
return CHILD_OPS (get_data_pathlabel, type, h, pathlabel);
}
int
ipv4_set_data_pathlabel (hicn_type_t type, hicn_protocol_t * h,
const u32 pathlabel)
{
return CHILD_OPS (set_data_pathlabel, type, h, pathlabel);
}
int
ipv4_update_data_pathlabel (hicn_type_t type, hicn_protocol_t * h,
const hicn_faceid_t face_id)
{
return CHILD_OPS (update_data_pathlabel, type, h, face_id);
}
int
ipv4_reset_data_for_hash (hicn_type_t type, hicn_protocol_t * h)
{
/* Sets everything to 0 up to source address */
memset (&h->ipv4, 0, 12);
/* Clears destination address */
memset (&(h->ipv4.daddr), 0, 4);
return CHILD_OPS (reset_data_for_hash, type, h);
}
int
ipv4_get_lifetime (hicn_type_t type, const hicn_protocol_t * h,
hicn_lifetime_t * lifetime)
{
return CHILD_OPS (get_lifetime, type, h, lifetime);
}
int
ipv4_set_lifetime (hicn_type_t type, hicn_protocol_t * h,
const hicn_lifetime_t lifetime)
{
return CHILD_OPS (set_lifetime, type, h, lifetime);
}
int
ipv4_update_checksums (hicn_type_t type, hicn_protocol_t * h,
u16 partial_csum, size_t payload_length)
{
/*
* Checksum field is not accounted for in lower layers, so we can compute
* them in any order. Note that it is only a header checksum.
*/
h->ipv4.csum = 0;
h->ipv4.csum = csum (h, IPV4_HDRLEN, 0);
/* Retrieve payload length if not specified, as it is not available later */
if (payload_length == 0)
{
int rc = ipv4_get_payload_length (type, h, &payload_length);
if (rc < 0)
return rc;
}
/* Ignore the payload if payload_length = ~0 */
if (payload_length == ~0)
{
payload_length = 0;
}
/* Build pseudo-header */
ipv4_pseudo_header_t psh;
psh.ip_src = h->ipv4.saddr;
psh.ip_dst = h->ipv4.daddr;
/* Size is u32 and not u16, we cannot copy and need to care about endianness */
psh.size = htons (ntohs (h->ipv4.len) - (u16) IPV4_HDRLEN);
psh.zero = 0;
psh.protocol = (u8) h->ipv4.protocol;
/* Compute partial checksum based on pseudo-header */
if (partial_csum != 0)
{
partial_csum = ~partial_csum;
}
partial_csum = csum (&psh, IPV4_PSHDRLEN, partial_csum);
return CHILD_OPS (update_checksums, type, h, partial_csum, payload_length);
}
int
ipv4_verify_checksums (hicn_type_t type, hicn_protocol_t * h,
u16 partial_csum, size_t payload_length)
{
/*
* Checksum field is not accounted for in lower layers, so we can compute
* them in any order. Note that it is only a header checksum.
*/
if (csum (h, IPV4_HDRLEN, 0) != 0)
return HICN_LIB_ERROR_CORRUPTED_PACKET;
/* Retrieve payload length if not specified, as it is not available later */
if (payload_length == 0)
{
int rc = ipv4_get_payload_length (type, h, &payload_length);
if (rc < 0)
return rc;
}
/* Build pseudo-header */
ipv4_pseudo_header_t psh;
psh.ip_src = h->ipv4.saddr;
psh.ip_dst = h->ipv4.daddr;
/* Size is u32 and not u16, we cannot copy and need to care about endianness */
psh.size = htons (ntohs (h->ipv4.len) - (u16) IPV4_HDRLEN);
psh.zero = 0;
psh.protocol = (u8) h->ipv4.protocol;
/* Compute partial checksum based on pseudo-header */
partial_csum = csum (&psh, IPV4_PSHDRLEN, 0);
return CHILD_OPS (update_checksums, type, h, partial_csum, payload_length);
}
int
ipv4_rewrite_interest (hicn_type_t type, hicn_protocol_t * h,
const ip46_address_t * addr_new,
ip46_address_t * addr_old)
{
// ASSERT(addr_old == NULL);
addr_old->ip4 = h->ipv4.saddr;
addr_old->pad[0] = 0;
addr_old->pad[1] = 0;
addr_old->pad[2] = 0;
h->ipv4.saddr = addr_new->ip4;
h->ipv4.csum = 0;
h->ipv4.csum = csum (&h->ipv4, IPV4_HDRLEN, 0);
return CHILD_OPS (rewrite_interest, type, h, addr_new, addr_old);
}
int
ipv4_rewrite_data (hicn_type_t type, hicn_protocol_t * h,
const ip46_address_t * addr_new, ip46_address_t * addr_old,
const hicn_faceid_t face_id)
{
// ASSERT(addr_old == NULL);
addr_old->ip4 = h->ipv4.daddr;
addr_old->pad[0] = 0;
addr_old->pad[1] = 0;
addr_old->pad[2] = 0;
h->ipv4.daddr = addr_new->ip4;
h->ipv4.csum = 0;
h->ipv4.csum = csum (&h->ipv4, IPV4_HDRLEN, 0);
return CHILD_OPS (rewrite_data, type, h, addr_new, addr_old, face_id);
}
int
ipv4_get_current_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * header_length)
{
*header_length = IPV4_HDRLEN;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * header_length)
{
*header_length = h->ipv4.len;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_current_header_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * header_length)
{
*header_length = IPV4_HDRLEN;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_header_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * header_length)
{
size_t child_header_length = 0;
int rc = CHILD_OPS (get_header_length, type, h, &child_header_length);
if (rc < 0)
return rc;
*header_length = IPV4_HDRLEN + child_header_length;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_payload_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * payload_length)
{
size_t child_header_length;
int rc = CHILD_OPS (get_header_length, type, h, &child_header_length);
if (rc < 0)
return rc;
*payload_length = htons (h->ipv4.len) - IPV4_HDRLEN - child_header_length;
return HICN_LIB_ERROR_NONE;
}
int
ipv4_set_payload_length (hicn_type_t type, hicn_protocol_t * h,
size_t payload_length)
{
size_t child_header_length;
int rc = CHILD_OPS (get_header_length, type, h, &child_header_length);
if (rc < 0)
return rc;
h->ipv4.len = htons ((u_short) (payload_length + IPV4_HDRLEN + child_header_length));
return HICN_LIB_ERROR_NONE;
}
int
ipv4_get_signature_size (hicn_type_t type, const hicn_protocol_t * h,
size_t * signature_size)
{
return CHILD_OPS (get_signature_size, type, h, signature_size);
}
int
ipv4_set_signature_size (hicn_type_t type, hicn_protocol_t * h,
size_t signature_size)
{
return CHILD_OPS (set_signature_size, type, h, signature_size);
}
int
ipv4_set_signature_timestamp(hicn_type_t type, hicn_protocol_t * h,
uint64_t signature_timestamp)
{
return CHILD_OPS (set_signature_timestamp, type, h, signature_timestamp);
}
int
ipv4_get_signature_timestamp (hicn_type_t type, const hicn_protocol_t * h,
uint64_t * signature_timestamp)
{
return CHILD_OPS (get_signature_timestamp, type, h, signature_timestamp);
}
int
ipv4_set_validation_algorithm (hicn_type_t type, hicn_protocol_t * h,
uint8_t validation_algorithm)
{
return CHILD_OPS (set_validation_algorithm, type, h, validation_algorithm);
}
int
ipv4_get_validation_algorithm (hicn_type_t type, const hicn_protocol_t * h,
uint8_t * validation_algorithm)
{
return CHILD_OPS (get_validation_algorithm, type, h, validation_algorithm);
}
int
ipv4_set_key_id (hicn_type_t type, hicn_protocol_t * h,
uint8_t *key_id)
{
return CHILD_OPS (set_key_id, type, h, key_id);
}
int
ipv4_get_key_id (hicn_type_t type, hicn_protocol_t * h,
uint8_t **key_id, uint8_t *key_id_size)
{
return CHILD_OPS (get_key_id, type, h, key_id, key_id_size);
}
int
ipv4_get_signature (hicn_type_t type, hicn_protocol_t * h,
uint8_t ** signature)
{
return CHILD_OPS (get_signature, type, h, signature);
}
DECLARE_HICN_OPS (ipv4);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|