mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-15 12:54:27 +00:00
230 lines
6 KiB
C
230 lines
6 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2021 Ng Peng Nam Sean
|
|
* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <sys/lock.h>
|
|
#include <sys/rmlock.h>
|
|
#include <sys/ck.h>
|
|
#include <sys/syslog.h>
|
|
|
|
#include <netlink/netlink.h>
|
|
#include <netlink/netlink_ctl.h>
|
|
#include <netlink/netlink_var.h>
|
|
|
|
#include <machine/atomic.h>
|
|
|
|
MALLOC_DEFINE(M_NETLINK, "netlink", "Memory used for netlink packets");
|
|
|
|
#define DEBUG_MOD_NAME nl_mod
|
|
#define DEBUG_MAX_LEVEL LOG_DEBUG3
|
|
#include <netlink/netlink_debug.h>
|
|
_DECLARE_DEBUG(LOG_DEBUG);
|
|
|
|
SYSCTL_NODE(_net, OID_AUTO, netlink, CTLFLAG_RD, 0, "");
|
|
SYSCTL_NODE(_net_netlink, OID_AUTO, debug, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
|
|
|
|
#define NL_MAX_HANDLERS 20
|
|
struct nl_proto_handler _nl_handlers[NL_MAX_HANDLERS];
|
|
struct nl_proto_handler *nl_handlers = _nl_handlers;
|
|
|
|
CK_LIST_HEAD(nl_control_head, nl_control);
|
|
static struct nl_control_head vnets_head = CK_LIST_HEAD_INITIALIZER();
|
|
|
|
VNET_DEFINE(struct nl_control *, nl_ctl) = NULL;
|
|
|
|
struct mtx nl_global_mtx;
|
|
MTX_SYSINIT(nl_global_mtx, &nl_global_mtx, "global netlink lock", MTX_DEF);
|
|
|
|
#define NL_GLOBAL_LOCK() mtx_lock(&nl_global_mtx)
|
|
#define NL_GLOBAL_UNLOCK() mtx_unlock(&nl_global_mtx)
|
|
|
|
int netlink_unloading = 0;
|
|
|
|
static void
|
|
free_nl_ctl(struct nl_control *ctl)
|
|
{
|
|
rm_destroy(&ctl->ctl_lock);
|
|
free(ctl, M_NETLINK);
|
|
}
|
|
|
|
struct nl_control *
|
|
vnet_nl_ctl_init(void)
|
|
{
|
|
struct nl_control *ctl;
|
|
|
|
ctl = malloc(sizeof(struct nl_control), M_NETLINK, M_WAITOK | M_ZERO);
|
|
rm_init(&ctl->ctl_lock, "netlink lock");
|
|
CK_LIST_INIT(&ctl->ctl_port_head);
|
|
CK_LIST_INIT(&ctl->ctl_pcb_head);
|
|
|
|
NL_GLOBAL_LOCK();
|
|
|
|
struct nl_control *tmp = atomic_load_ptr(&V_nl_ctl);
|
|
|
|
if (tmp == NULL) {
|
|
atomic_store_ptr(&V_nl_ctl, ctl);
|
|
CK_LIST_INSERT_HEAD(&vnets_head, ctl, ctl_next);
|
|
NL_LOG(LOG_DEBUG2, "VNET %p init done, inserted %p into global list",
|
|
curvnet, ctl);
|
|
} else {
|
|
NL_LOG(LOG_DEBUG, "per-VNET init clash, dropping this instance");
|
|
free_nl_ctl(ctl);
|
|
ctl = tmp;
|
|
}
|
|
|
|
NL_GLOBAL_UNLOCK();
|
|
|
|
return (ctl);
|
|
}
|
|
|
|
static void
|
|
vnet_nl_ctl_destroy(const void *unused __unused)
|
|
{
|
|
struct nl_control *ctl;
|
|
|
|
/* Assume at the time all of the processes / sockets are dead */
|
|
|
|
NL_GLOBAL_LOCK();
|
|
ctl = atomic_load_ptr(&V_nl_ctl);
|
|
atomic_store_ptr(&V_nl_ctl, NULL);
|
|
if (ctl != NULL) {
|
|
NL_LOG(LOG_DEBUG2, "Removing %p from global list", ctl);
|
|
CK_LIST_REMOVE(ctl, ctl_next);
|
|
}
|
|
NL_GLOBAL_UNLOCK();
|
|
|
|
if (ctl != NULL)
|
|
free_nl_ctl(ctl);
|
|
}
|
|
VNET_SYSUNINIT(vnet_nl_ctl_destroy, SI_SUB_PROTO_IF, SI_ORDER_ANY,
|
|
vnet_nl_ctl_destroy, NULL);
|
|
|
|
int
|
|
nl_verify_proto(int proto)
|
|
{
|
|
if (proto < 0 || proto >= NL_MAX_HANDLERS) {
|
|
return (EINVAL);
|
|
}
|
|
int handler_defined = nl_handlers[proto].cb != NULL;
|
|
return (handler_defined ? 0 : EPROTONOSUPPORT);
|
|
}
|
|
|
|
const char *
|
|
nl_get_proto_name(int proto)
|
|
{
|
|
return (nl_handlers[proto].proto_name);
|
|
}
|
|
|
|
bool
|
|
netlink_register_proto(int proto, const char *proto_name, nl_handler_f handler)
|
|
{
|
|
if ((proto < 0) || (proto >= NL_MAX_HANDLERS))
|
|
return (false);
|
|
NL_GLOBAL_LOCK();
|
|
KASSERT((nl_handlers[proto].cb == NULL), ("netlink handler %d is already set", proto));
|
|
nl_handlers[proto].cb = handler;
|
|
nl_handlers[proto].proto_name = proto_name;
|
|
NL_GLOBAL_UNLOCK();
|
|
NL_LOG(LOG_DEBUG, "Registered netlink %s(%d) handler", proto_name, proto);
|
|
return (true);
|
|
}
|
|
|
|
bool
|
|
netlink_unregister_proto(int proto)
|
|
{
|
|
if ((proto < 0) || (proto >= NL_MAX_HANDLERS))
|
|
return (false);
|
|
NL_GLOBAL_LOCK();
|
|
KASSERT((nl_handlers[proto].cb != NULL), ("netlink handler %d is not set", proto));
|
|
nl_handlers[proto].cb = NULL;
|
|
nl_handlers[proto].proto_name = NULL;
|
|
NL_GLOBAL_UNLOCK();
|
|
NL_LOG(LOG_DEBUG, "Unregistered netlink proto %d handler", proto);
|
|
return (true);
|
|
}
|
|
|
|
static bool
|
|
can_unload(void)
|
|
{
|
|
struct nl_control *ctl;
|
|
bool result = true;
|
|
|
|
NL_GLOBAL_LOCK();
|
|
|
|
CK_LIST_FOREACH(ctl, &vnets_head, ctl_next) {
|
|
NL_LOG(LOG_DEBUG2, "Iterating VNET head %p", ctl);
|
|
if (!CK_LIST_EMPTY(&ctl->ctl_pcb_head)) {
|
|
NL_LOG(LOG_NOTICE, "non-empty socket list in ctl %p", ctl);
|
|
result = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
NL_GLOBAL_UNLOCK();
|
|
|
|
return (result);
|
|
}
|
|
|
|
static int
|
|
netlink_modevent(module_t mod __unused, int what, void *priv __unused)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (what) {
|
|
case MOD_LOAD:
|
|
NL_LOG(LOG_DEBUG, "Loading");
|
|
NL_LOG(LOG_NOTICE, "netlink support is in BETA stage");
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
NL_LOG(LOG_DEBUG, "Unload called");
|
|
if (can_unload()) {
|
|
NL_LOG(LOG_WARNING, "unloading");
|
|
netlink_unloading = 1;
|
|
} else
|
|
ret = EBUSY;
|
|
break;
|
|
|
|
default:
|
|
ret = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
static moduledata_t netlink_mod = { "netlink", netlink_modevent, NULL };
|
|
|
|
DECLARE_MODULE(netlink, netlink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(netlink, 1);
|