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- /*-
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * 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/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 <netlink/route/route_var.h>
- #include <machine/atomic.h>
- FEATURE(netlink, "Netlink support");
- #define DEBUG_MOD_NAME nl_mod
- #define DEBUG_MAX_LEVEL LOG_DEBUG3
- #include <netlink/netlink_debug.h>
- _DECLARE_DEBUG(LOG_INFO);
- #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_DEBUG2, "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_DEBUG2, "Unregistered netlink proto %d handler", proto);
- return (true);
- }
- #if !defined(NETLINK) && defined(NETLINK_MODULE)
- /* Non-stub function provider */
- const static struct nl_function_wrapper nl_module = {
- .nlmsg_add = _nlmsg_add,
- .nlmsg_refill_buffer = _nlmsg_refill_buffer,
- .nlmsg_flush = _nlmsg_flush,
- .nlmsg_end = _nlmsg_end,
- .nlmsg_abort = _nlmsg_abort,
- .nlmsg_get_unicast_writer = _nlmsg_get_unicast_writer,
- .nlmsg_get_group_writer = _nlmsg_get_group_writer,
- .nlmsg_end_dump = _nlmsg_end_dump,
- .nl_modify_ifp_generic = _nl_modify_ifp_generic,
- .nl_store_ifp_cookie = _nl_store_ifp_cookie,
- .nl_get_thread_nlp = _nl_get_thread_nlp,
- };
- #endif
- 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_DEBUG2, "Loading");
- nl_osd_register();
- #if !defined(NETLINK) && defined(NETLINK_MODULE)
- nl_set_functions(&nl_module);
- #endif
- break;
- case MOD_UNLOAD:
- NL_LOG(LOG_DEBUG2, "Unload called");
- if (can_unload()) {
- NL_LOG(LOG_WARNING, "unloading");
- netlink_unloading = 1;
- #if !defined(NETLINK) && defined(NETLINK_MODULE)
- nl_set_functions(NULL);
- #endif
- nl_osd_unregister();
- } 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);
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