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/* BSD's IPsec Interface, for libreswan
*
* Copyright (C) 2024 Andrew Cagney
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
*/
#include "ip_info.h"
#include "reqid.h"
#include "ipsec_interface.h"
#include "kernel_ipsec_interface.h"
#include "iface.h"
#include "server_run.h"
#include "log.h"
static reqid_t reqid_base;
static bool netbsd_ipsec_interface_has_cidr(const char *ipsec_if_name,
ip_cidr cidr,
struct verbose verbose)
{
cidr_buf cb;
vlog("%s() always true %s %s", __func__, ipsec_if_name,
str_cidr(&cidr, &cb));
return true;
}
/*
* ifconfig ipsec0 inet 172.16.100.1/32 172.16.200.1
* where 172.16.200.1 is the interface-ip / sourceip.
*/
static bool netbsd_ipsec_interface_add_cidr(const char *ipsec_if_name,
ip_cidr cidr,
struct verbose verbose)
{
/* same scope as add[] */
cidr_buf cb;
address_buf ab;
ip_address address = cidr_address(cidr);
const struct ip_info *afi = cidr_info(cidr);
const char *add[] = {
"ifconfig",
ipsec_if_name,
afi->inet_name, /* "inet" or "inet6" */
str_cidr(&cidr, &cb),
str_address(&address, &ab),
NULL,
};
return server_runv(add, verbose);
}
static void netbsd_ipsec_interface_del_cidr(const char *ipsec_if_name,
ip_cidr cidr UNUSED,
struct verbose verbose)
{
/* same scope as add[] */
cidr_buf cb;
address_buf ab;
ip_address address = cidr_address(cidr);
const struct ip_info *afi = cidr_info(cidr);
const char *delete[] = {
"ifconfig",
ipsec_if_name,
"delete",
afi->inet_name, /* "inet" or "inet6" */
str_cidr(&cidr, &cb),
str_address(&address, &ab),
NULL,
};
server_runv(delete, verbose);
}
static bool netbsd_ipsec_interface_add(const char *ipsec_if_name,
const ipsec_interface_id_t ipsec_if_id UNUSED,
const struct iface_device *iface UNUSED,
struct verbose verbose)
{
const char *create[] = {
"ifconfig",
ipsec_if_name,
"create",
NULL,
};
return server_runv(create, verbose);
}
static bool netbsd_ipsec_interface_up(const char *ipsec_if_name UNUSED,
struct verbose verbose UNUSED)
{
const char *up[] = {
"ifconfig",
ipsec_if_name,
"up",
NULL,
};
return server_runv(up, verbose);
}
static bool netbsd_ipsec_interface_del(const char *ipsec_if_name,
struct verbose verbose)
{
const char *destroy[] = {
"ifconfig",
ipsec_if_name,
"destroy",
NULL,
};
return server_runv(destroy, verbose);
}
static bool netbsd_ipsec_interface_match(struct ipsec_interface_match *match UNUSED,
struct verbose verbose UNUSED)
{
const char *run[] = {
"ifconfig",
match->ipsec_if_name,
NULL,
};
bool ok = server_runv(run, verbose);
if (ok) {
jam_str(match->found, sizeof(match->found), match->ipsec_if_name);
} else {
match->diag = diag("not found");
}
return ok;
}
static err_t read_sysctl(const char *ctl, uintmax_t *value, struct verbose verbose)
{
const char *sysctl[] = {
"sysctl",
"-n",
ctl,
NULL,
};
chunk_t chunk = server_runv_chunk(sysctl, verbose);
if (chunk.len == 0) {
return "problem reading ..., no output";
}
shunk_t shunk = HUNK_AS_SHUNK(chunk);
err_t e = shunk_to_uintmax(shunk, &shunk, 10, value);
if (e != NULL) {
return "problem reading ..., invalid number";
}
free_chunk_content(&chunk);
return NULL;
}
static err_t netbsd_ipsec_interface_init(struct verbose verbose)
{
err_t e;
/* check net.ipsecif.use_fixed_reqid=1 */
uintmax_t fixed;
e = read_sysctl("net.ipsecif.use_fixed_reqid", &fixed, verbose);
if (e != NULL) {
return e;
}
if (fixed == 0) {
return "net.ipsecif.use_fixed_reqid should be 1";
}
/* extract base */
uintmax_t base;
e = read_sysctl("net.ipsecif.reqid_base", &base, verbose);
if (e != NULL) {
return e;
}
if (base < 8192) {
return "net.ipsecif.reqid_base is too small";
}
if (base >= 16384/*magic*/) {
return "net.ipsecif.reqid_base is too big";
}
reqid_base = base;
return NULL;
}
static reqid_t netbsd_ipsec_interface_reqid(ipsec_interface_id_t if_id,
struct verbose verbose)
{
vdbg("()");
return reqid_base + (if_id * 2);
}
const struct kernel_ipsec_interface kernel_ipsec_interface_ifconfig = {
.name = "ipsec",
.has_cidr = netbsd_ipsec_interface_has_cidr,
.add_cidr = netbsd_ipsec_interface_add_cidr,
.del_cidr = netbsd_ipsec_interface_del_cidr,
.add = netbsd_ipsec_interface_add,
.up = netbsd_ipsec_interface_up,
.del = netbsd_ipsec_interface_del,
.reqid = netbsd_ipsec_interface_reqid,
.match = netbsd_ipsec_interface_match,
.init = netbsd_ipsec_interface_init,
};
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