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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.
*/
#include <string.h>
#include <hicn/protocol/tcp.h>
#include <hicn/error.h>
#include <hicn/ops.h>
#define TCP_DEFAULT_SRC_PORT 0x8000
#define TCP_DEFAULT_DST_PORT 0x0080
#define TCP_DEFAULT_WINDOW_SIZE 0 // In [2, 65535]
#define TCP_DEFAULT_HLEN 20
#define TCP_DEFAULT_DATA_OFFSET_RES (TCP_DEFAULT_HLEN >> 2) << 4
#define TCP_DEFAULT_CWR 0
#define TCP_DEFAULT_ECE 0
#define TCP_DEFAULT_URG 0
#define TCP_DEFAULT_ACK 0
#define TCP_DEFAULT_PSH 0
#define TCP_DEFAULT_RST 0
#define TCP_DEFAULT_SYN 1
#define TCP_DEFAULT_FIN 0
DECLARE_get_interest_locator (tcp, UNEXPECTED);
DECLARE_set_interest_locator (tcp, UNEXPECTED);
DECLARE_get_interest_name (tcp, UNEXPECTED);
DECLARE_set_interest_name (tcp, UNEXPECTED);
DECLARE_get_data_locator (tcp, UNEXPECTED);
DECLARE_set_data_locator (tcp, UNEXPECTED);
DECLARE_get_data_name (tcp, UNEXPECTED);
DECLARE_set_data_name (tcp, UNEXPECTED);
DECLARE_get_length (tcp, UNEXPECTED);
DECLARE_get_payload_length (tcp, UNEXPECTED);
DECLARE_set_payload_length (tcp, UNEXPECTED);
int
tcp_init_packet_header (hicn_type_t type, hicn_protocol_t * h)
{
h->tcp = (_tcp_header_t)
{
.sport = htons (TCP_DEFAULT_SRC_PORT),.dport =
htons (TCP_DEFAULT_DST_PORT),.seq = 0,.seq_ack =
0,.data_offset_and_reserved = TCP_DEFAULT_DATA_OFFSET_RES,.flags =
TCP_DEFAULT_CWR << 7 | TCP_DEFAULT_ECE << 6 | TCP_DEFAULT_URG << 5 |
TCP_DEFAULT_ACK << 4 | TCP_DEFAULT_PSH << 3 | TCP_DEFAULT_RST << 2 |
TCP_DEFAULT_SYN << 1 | TCP_DEFAULT_FIN << 0,.window =
htons (TCP_DEFAULT_WINDOW_SIZE),.csum = 0,.urg_ptr = 65000,};
uint8_t ah_flag = type.l2 == IPPROTO_AH ? AH_FLAG : 0;
h->tcp.flags |= ah_flag;
return CHILD_OPS (init_packet_header, type, h);
}
int
tcp_get_interest_name_suffix (hicn_type_t type, const hicn_protocol_t * h,
hicn_name_suffix_t * suffix)
{
*suffix = ntohl (h->tcp.name_suffix);
return HICN_LIB_ERROR_NONE;
}
int
tcp_set_interest_name_suffix (hicn_type_t type, hicn_protocol_t * h,
const hicn_name_suffix_t * suffix)
{
h->tcp.name_suffix = htonl (*suffix);
return HICN_LIB_ERROR_NONE;
}
int
tcp_mark_packet_as_interest (hicn_type_t type, hicn_protocol_t * h)
{
h->tcp.flags &= ~HICN_TCP_FLAG_ECE;
return HICN_LIB_ERROR_NONE;
}
int
tcp_mark_packet_as_data (hicn_type_t type, hicn_protocol_t * h)
{
h->tcp.flags |= HICN_TCP_FLAG_ECE;
return HICN_LIB_ERROR_NONE;
}
int
tcp_test_packet_is_interest (hicn_type_t type, hicn_protocol_t * h, u8 *ret)
{
*ret = !(h->tcp.flags & HICN_TCP_FLAG_ECE);
return HICN_LIB_ERROR_NONE;
}
int
tcp_reset_interest_for_hash (hicn_type_t type, hicn_protocol_t * h)
{
memset (&(h->tcp), 0, 4);
memset (&(h->tcp.seq_ack), 0, 12);
return CHILD_OPS (reset_interest_for_hash, type, h);
}
int
tcp_get_data_name_suffix (hicn_type_t type, const hicn_protocol_t * h,
hicn_name_suffix_t * suffix)
{
*suffix = ntohl (h->tcp.name_suffix);
return HICN_LIB_ERROR_NONE;
}
int
tcp_set_data_name_suffix (hicn_type_t type, hicn_protocol_t * h,
const hicn_name_suffix_t * suffix)
{
h->tcp.name_suffix = htonl (*suffix);
return HICN_LIB_ERROR_NONE;
}
int
tcp_get_data_pathlabel (hicn_type_t type, const hicn_protocol_t * h,
u32 * pathlabel)
{
*pathlabel = h->tcp.seq_ack;
return HICN_LIB_ERROR_NONE;
}
int
tcp_set_data_pathlabel (hicn_type_t type, hicn_protocol_t * h,
const u32 pathlabel)
{
h->tcp.seq_ack = pathlabel;
return HICN_LIB_ERROR_NONE;
}
int
tcp_update_data_pathlabel (hicn_type_t type, hicn_protocol_t * h,
const hicn_faceid_t face_id)
{
hicn_pathlabel_t pl =
(hicn_pathlabel_t) ((h->tcp.pathlabel & HICN_PATH_LABEL_MASK) >> (32 -
HICN_PATH_LABEL_SIZE));
hicn_pathlabel_t new_pl;
update_pathlabel (pl, face_id, &new_pl);
h->tcp.pathlabel = new_pl;
return HICN_LIB_ERROR_NONE;
}
int
tcp_reset_data_for_hash (hicn_type_t type, hicn_protocol_t * h)
{
memset (&(h->tcp), 0, 4);
memset (&(h->tcp.seq_ack), 0, 12);
return CHILD_OPS (reset_data_for_hash, type, h);
}
int
tcp_get_lifetime (hicn_type_t type, const hicn_protocol_t * h,
hicn_lifetime_t * lifetime)
{
*lifetime =
ntohs (h->tcp.urg_ptr) << (h->tcp.data_offset_and_reserved & 0xF);
return HICN_LIB_ERROR_NONE;
}
int
tcp_set_lifetime (hicn_type_t type, hicn_protocol_t * h,
const hicn_lifetime_t lifetime)
{
u8 multiplier = 0;
u32 lifetime_scaled = lifetime;
if (PREDICT_FALSE (lifetime >= HICN_MAX_LIFETIME))
{
h->tcp.urg_ptr = htons (HICN_MAX_LIFETIME_SCALED);
h->tcp.data_offset_and_reserved =
(h->
tcp.data_offset_and_reserved & ~0x0F) | HICN_MAX_LIFETIME_MULTIPLIER;
return HICN_LIB_ERROR_NONE;
}
while (lifetime_scaled > HICN_MAX_LIFETIME_SCALED
&& multiplier <= HICN_MAX_LIFETIME_MULTIPLIER)
{
multiplier++;
lifetime_scaled = lifetime_scaled >> 1;
}
h->tcp.urg_ptr = htons (lifetime_scaled);
h->tcp.data_offset_and_reserved =
(h->tcp.data_offset_and_reserved & ~0x0F) | multiplier;
return HICN_LIB_ERROR_NONE;
}
int
tcp_update_checksums (hicn_type_t type, hicn_protocol_t * h, u16 partial_csum,
size_t payload_length)
{
h->tcp.csum = 0;
if (PREDICT_TRUE (partial_csum != 0))
{
partial_csum = ~partial_csum;
}
h->tcp.csum = csum (h, TCP_HDRLEN + payload_length, partial_csum);
return CHILD_OPS (update_checksums, type, h, 0, payload_length);
}
int
tcp_verify_checksums (hicn_type_t type, hicn_protocol_t * h, u16 partial_csum,
size_t payload_length)
{
if (csum (h, TCP_HDRLEN + payload_length, ~partial_csum) != 0)
return HICN_LIB_ERROR_CORRUPTED_PACKET;
return CHILD_OPS (verify_checksums, type, h, 0, payload_length);
}
#define TCP_OFFSET_MASK 13
#define TCP_OFFSET_DATA_OFFSET 12
#define TCP_OFFSET_IN_BITS_DATA_OFFSET 0
#define TCP_OFFSET_IN_BITS_RESERVED 4
#define TCP_OFFSET_IN_BITS_NS 7
#define TCP_DEFAULT_SRC_PORT 0x8000
#define TCP_DEFAULT_DST_PORT 0x0080
#define TCP_DEFAULT_WINDOW_SIZE 0 // In [2, 65535]
#define TCP_DEFAULT_DATA_OFFSET 5 // Size of the TCP header in words (= 4 bytes). Must be greater or equal than 5.
#define TCP_DEFAULT_CWR 0
#define TCP_DEFAULT_ECE 0
#define TCP_DEFAULT_URG 0
#define TCP_DEFAULT_ACK 0
#define TCP_DEFAULT_PSH 0
#define TCP_DEFAULT_RST 0
#define TCP_DEFAULT_SYN 1
#define TCP_DEFAULT_FIN 0
int
tcp_rewrite_interest (hicn_type_t type, hicn_protocol_t * h,
const ip46_address_t * addr_new,
ip46_address_t * addr_old)
{
u16 *tcp_checksum = &(h->tcp.csum);
/*
* Padding fields are set to zero so we can apply checksum on the
* whole struct by interpreting it as IPv6 in all cases
*
* v4 code would be:
* csum = ip_csum_sub_even (*tcp_checksum, h->ipv4.saddr.as_u32);
* csum = ip_csum_add_even (csum, h->ipv4.saddr.as_u32);
*/
ip_csum_t csum = ip_csum_sub_even (*tcp_checksum, (ip_csum_t) (h->ipv6.saddr.as_u64[0]));
csum = ip_csum_sub_even (csum, (ip_csum_t) (h->ipv6.saddr.as_u64[1]));
csum = ip_csum_add_even (csum, (ip_csum_t) (h->ipv6.saddr.as_u64[0]));
csum = ip_csum_add_even (csum, (ip_csum_t) (h->ipv6.saddr.as_u64[1]));
*tcp_checksum = ip_csum_fold (csum);
return HICN_LIB_ERROR_NONE;
}
int
tcp_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)
{
u16 *tcp_checksum = &(h->tcp.csum);
/*
* Padding fields are set to zero so we can apply checksum on the
* whole struct by interpreting it as IPv6 in all cases
*
* v4 code would be:
* csum = ip_csum_sub_even (*tcp_checksum, h->ipv4.saddr.as_u32);
* csum = ip_csum_add_even (csum, h->ipv4.saddr.as_u32);
*/
ip_csum_t csum = ip_csum_sub_even (*tcp_checksum, (ip_csum_t) (addr_old->ip6.as_u64[0]));
csum = ip_csum_sub_even (*tcp_checksum, (ip_csum_t) (addr_old->ip6.as_u64[1]));
csum = ip_csum_add_even (csum, (ip_csum_t) (addr_new->ip6.as_u64[0]));
csum = ip_csum_add_even (csum, (ip_csum_t) (addr_new->ip6.as_u64[1]));
csum = ip_csum_sub_even (csum, h->tcp.pathlabel);
tcp_update_data_pathlabel (type, h, face_id);
csum = ip_csum_add_even (csum, h->tcp.pathlabel);
*tcp_checksum = ip_csum_fold (csum);
return HICN_LIB_ERROR_NONE;
}
int
tcp_get_current_header_length (hicn_type_t type, const hicn_protocol_t * h,
size_t * header_length)
{
*header_length = TCP_HDRLEN;
return HICN_LIB_ERROR_NONE;
}
int
tcp_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 = TCP_HDRLEN + child_header_length;
return HICN_LIB_ERROR_NONE;
}
int
tcp_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
tcp_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
tcp_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
tcp_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
tcp_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
tcp_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
tcp_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
tcp_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
tcp_get_signature (hicn_type_t type, hicn_protocol_t * h,
uint8_t ** signature)
{
return CHILD_OPS (get_signature, type, h, signature);
}
DECLARE_HICN_OPS (tcp);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|