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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.
*/
/**
* @file mapme.c
* @brief Implementation of MAP-Me anchorless producer mobility management.
*/
#include <hicn/mapme.h>
#include <hicn/common.h>
#include <hicn/error.h>
#include "protocol/ipv4.h"
#include "protocol/ipv6.h"
#include "protocol/icmprd.h"
/** @brief MAP-Me packet header for IPv4 */
typedef struct
{
_ipv4_header_t ip;
_icmprd4_header_t icmp_rd;
seq_t seq;
u8 len;
u8 _pad[3];
} hicn_mapme_v4_header_t;
/** @brief MAP-Me packet header for IPv6 */
typedef struct
{
_ipv6_header_t ip;
_icmprd_header_t icmp_rd;
seq_t seq;
u8 len;
u8 _pad[3];
} hicn_mapme_v6_header_t;
/** @brief MAP-Me packet header (IP version agnostic) */
typedef union
{
hicn_mapme_v4_header_t v4;
hicn_mapme_v6_header_t v6;
} hicn_mapme_header_t;
#define HICN_MAPME_V4_HDRLEN sizeof (hicn_mapme_v4_header_t)
#define HICN_MAPME_V6_HDRLEN sizeof (hicn_mapme_v6_header_t)
static_assert (EXPECTED_MAPME_V4_HDRLEN == HICN_MAPME_V4_HDRLEN,
"Size of MAPME_V4 struct does not match its expected size.");
static_assert (EXPECTED_MAPME_V6_HDRLEN == HICN_MAPME_V6_HDRLEN,
"Size of MAPME_V6 struct does not match its expected size.");
size_t
hicn_mapme_v4_create_packet (u8 *buf, const hicn_prefix_t *prefix,
const mapme_params_t *params)
{
hicn_mapme_v4_header_t *mh = (hicn_mapme_v4_header_t *) buf;
/* *INDENT-OFF* */
*mh = (hicn_mapme_v4_header_t) {
.ip = {
.version_ihl = (IPV4_DEFAULT_VERSION << 4) | (0x0f & IPV4_DEFAULT_IHL),
.tos = IPV4_DEFAULT_TOS,
.len = HICN_MAPME_V4_HDRLEN,
.id = htons(IPV4_DEFAULT_ID),
.frag_off = htons(IPV4_DEFAULT_FRAG_OFF),
.ttl = HICN_MAPME_TTL,
.protocol = IPPROTO_ICMP,
.csum = 0,
.saddr.as_u32 = IPV4_LOOPBACK.v4.as_u32,
.daddr = prefix->name.v4,
},
.icmp_rd = {
.type = ((params->type == UPDATE) || (params->type == NOTIFICATION)) ? HICN_MAPME_ICMP_TYPE_IPV4 : HICN_MAPME_ICMP_TYPE_ACK_IPV4,
.code = HICN_MAPME_ICMP_CODE,
.csum = 0,
.ip = prefix->name.v4,
},
.seq = htonl(params->seq),
.len = prefix->len,
};
/* *INDENT-ON* */
return HICN_MAPME_V4_HDRLEN;
}
size_t
hicn_mapme_v6_create_packet (u8 *buf, const hicn_prefix_t *prefix,
const mapme_params_t *params)
{
hicn_mapme_v6_header_t *mh = (hicn_mapme_v6_header_t *) buf;
/* *INDENT-OFF* */
*mh = (hicn_mapme_v6_header_t) {
.ip = {
.saddr = IPV6_LOOPBACK.v6,
.daddr = prefix->name.v6,
.version_class_flow = htonl(
(IPV6_DEFAULT_VERSION << 28) |
(IPV6_DEFAULT_TRAFFIC_CLASS << 20) |
(IPV6_DEFAULT_FLOW_LABEL & 0xfffff)),
.len = htons(HICN_MAPME_V6_HDRLEN - IPV6_HDRLEN),
.nxt = IPPROTO_ICMPV6,
.hlim = HICN_MAPME_TTL,
},
.icmp_rd = {
.type = ((params->type == UPDATE) || (params->type == NOTIFICATION)) ? HICN_MAPME_ICMP_TYPE_IPV6 : HICN_MAPME_ICMP_TYPE_ACK_IPV6,
.code = HICN_MAPME_ICMP_CODE,
.csum = 0,
.res = 0,
.tgt = prefix->name.v6,
.dst = prefix->name.v6,
},
.seq = htonl(params->seq),
.len = prefix->len,
};
/* *INDENT-ON* */
return HICN_MAPME_V6_HDRLEN;
}
size_t
hicn_mapme_create_packet (u8 *buf, const hicn_prefix_t *prefix,
const mapme_params_t *params)
{
/* We currently ignore subsequent protocol definitions */
if (HICN_EXPECT_TRUE (params->protocol == IPPROTO_IPV6))
return hicn_mapme_v6_create_packet (buf, prefix, params);
else
return hicn_mapme_v4_create_packet (buf, prefix, params);
}
size_t
hicn_mapme_v4_create_ack (u8 *buf, const mapme_params_t *params)
{
ipv4_address_t tmp; // tmp storage for swapping IP addresses for ACK
hicn_mapme_v4_header_t *mh = (hicn_mapme_v4_header_t *) buf;
tmp = mh->ip.daddr;
mh->ip.daddr = mh->ip.saddr;
mh->ip.saddr = tmp;
mh->ip.ttl = HICN_MAPME_TTL;
mh->icmp_rd.type = HICN_MAPME_ICMP_TYPE_ACK_IPV4;
mh->icmp_rd.csum = 0;
return HICN_MAPME_V4_HDRLEN;
}
size_t
hicn_mapme_v6_create_ack (u8 *buf, const mapme_params_t *params)
{
ipv6_address_t tmp; // tmp storage for swapping IP addresses for ACK
hicn_mapme_v6_header_t *mh = (hicn_mapme_v6_header_t *) buf;
tmp = mh->ip.daddr;
mh->ip.daddr = mh->ip.saddr;
mh->ip.saddr = tmp;
mh->ip.hlim = HICN_MAPME_TTL;
mh->icmp_rd.type = HICN_MAPME_ICMP_TYPE_ACK_IPV6;
mh->icmp_rd.csum = 0;
return HICN_MAPME_V6_HDRLEN;
}
size_t
hicn_mapme_create_ack (u8 *buf, const mapme_params_t *params)
{
/* We currently ignore subsequent protocol definitions */
if (HICN_EXPECT_TRUE (params->protocol == IPPROTO_IPV6))
return hicn_mapme_v6_create_ack (buf, params);
else
return hicn_mapme_v4_create_ack (buf, params);
}
int
hicn_mapme_v4_parse_packet (const u8 *packet, hicn_prefix_t *prefix,
mapme_params_t *params)
{
hicn_mapme_v4_header_t *mh = (hicn_mapme_v4_header_t *) packet;
/* *INDENT-OFF* */
*prefix = (hicn_prefix_t) {
.name = {
.v4 = HICN_MAPME_TYPE_IS_IU (mh->icmp_rd.type) ? mh->ip.daddr : mh->ip.saddr,
},
.len = mh->len,
};
*params = (mapme_params_t){
.protocol = IPPROTO_IP,
.type =
(mh->icmp_rd.type == HICN_MAPME_ICMP_TYPE_IPV4) ? UPDATE : UPDATE_ACK,
.seq = ntohl (mh->seq),
};
/* *INDENT-ON* */
return HICN_LIB_ERROR_NONE;
}
int
hicn_mapme_v6_parse_packet (const u8 *packet, hicn_prefix_t *prefix,
mapme_params_t *params)
{
hicn_mapme_v6_header_t *mh = (hicn_mapme_v6_header_t *) packet;
/* *INDENT-OFF* */
*prefix = (hicn_prefix_t) {
.name = {
.v6 = HICN_MAPME_TYPE_IS_IU (mh->icmp_rd.type) ? mh->ip.daddr : mh->ip.saddr,
},
.len = mh->len,
};
*params = (mapme_params_t){
.protocol = IPPROTO_IPV6,
.type =
(mh->icmp_rd.type == HICN_MAPME_ICMP_TYPE_IPV6) ? UPDATE : UPDATE_ACK,
.seq = ntohl (mh->seq),
};
/* *INDENT-ON* */
return HICN_LIB_ERROR_NONE;
}
int
hicn_mapme_parse_packet (const u8 *packet, hicn_prefix_t *prefix,
mapme_params_t *params)
{
switch (HICN_IP_VERSION (packet))
{
case 4:
return hicn_mapme_v4_parse_packet (packet, prefix, params);
case 6:
return hicn_mapme_v6_parse_packet (packet, prefix, params);
default:
break;
}
return HICN_LIB_ERROR_UNEXPECTED;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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