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ff15498894
Move the NETLINK define into opt_global.h so we can rely on it being
set correctly, without having to remember to include opt_netlink.h.
This ensures that the NETLINK define is correctly set. If not we
may end up with unloadable modules, due to missing symbols (such as
nlmsg_get_group_writer).
PR: 274306
Reviewed by: imp, markj
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D42179
(cherry picked from commit ab393e9548
)
255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Ng Peng Nam Sean
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* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/ck.h>
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#include <sys/syslog.h>
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#include <netlink/netlink.h>
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#include <netlink/netlink_ctl.h>
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#include <netlink/netlink_var.h>
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#include <netlink/route/route_var.h>
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#include <machine/atomic.h>
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FEATURE(netlink, "Netlink support");
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#define DEBUG_MOD_NAME nl_mod
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#define DEBUG_MAX_LEVEL LOG_DEBUG3
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#include <netlink/netlink_debug.h>
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_DECLARE_DEBUG(LOG_INFO);
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#define NL_MAX_HANDLERS 20
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struct nl_proto_handler _nl_handlers[NL_MAX_HANDLERS];
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struct nl_proto_handler *nl_handlers = _nl_handlers;
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CK_LIST_HEAD(nl_control_head, nl_control);
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static struct nl_control_head vnets_head = CK_LIST_HEAD_INITIALIZER();
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VNET_DEFINE(struct nl_control *, nl_ctl) = NULL;
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struct mtx nl_global_mtx;
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MTX_SYSINIT(nl_global_mtx, &nl_global_mtx, "global netlink lock", MTX_DEF);
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#define NL_GLOBAL_LOCK() mtx_lock(&nl_global_mtx)
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#define NL_GLOBAL_UNLOCK() mtx_unlock(&nl_global_mtx)
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int netlink_unloading = 0;
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static void
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free_nl_ctl(struct nl_control *ctl)
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{
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rm_destroy(&ctl->ctl_lock);
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free(ctl, M_NETLINK);
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}
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struct nl_control *
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vnet_nl_ctl_init(void)
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{
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struct nl_control *ctl;
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ctl = malloc(sizeof(struct nl_control), M_NETLINK, M_WAITOK | M_ZERO);
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rm_init(&ctl->ctl_lock, "netlink lock");
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CK_LIST_INIT(&ctl->ctl_port_head);
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CK_LIST_INIT(&ctl->ctl_pcb_head);
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NL_GLOBAL_LOCK();
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struct nl_control *tmp = atomic_load_ptr(&V_nl_ctl);
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if (tmp == NULL) {
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atomic_store_ptr(&V_nl_ctl, ctl);
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CK_LIST_INSERT_HEAD(&vnets_head, ctl, ctl_next);
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NL_LOG(LOG_DEBUG2, "VNET %p init done, inserted %p into global list",
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curvnet, ctl);
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} else {
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NL_LOG(LOG_DEBUG, "per-VNET init clash, dropping this instance");
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free_nl_ctl(ctl);
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ctl = tmp;
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}
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NL_GLOBAL_UNLOCK();
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return (ctl);
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}
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static void
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vnet_nl_ctl_destroy(const void *unused __unused)
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{
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struct nl_control *ctl;
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/* Assume at the time all of the processes / sockets are dead */
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NL_GLOBAL_LOCK();
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ctl = atomic_load_ptr(&V_nl_ctl);
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atomic_store_ptr(&V_nl_ctl, NULL);
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if (ctl != NULL) {
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NL_LOG(LOG_DEBUG2, "Removing %p from global list", ctl);
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CK_LIST_REMOVE(ctl, ctl_next);
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}
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NL_GLOBAL_UNLOCK();
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if (ctl != NULL)
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free_nl_ctl(ctl);
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}
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VNET_SYSUNINIT(vnet_nl_ctl_destroy, SI_SUB_PROTO_IF, SI_ORDER_ANY,
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vnet_nl_ctl_destroy, NULL);
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int
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nl_verify_proto(int proto)
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{
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if (proto < 0 || proto >= NL_MAX_HANDLERS) {
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return (EINVAL);
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}
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int handler_defined = nl_handlers[proto].cb != NULL;
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return (handler_defined ? 0 : EPROTONOSUPPORT);
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}
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const char *
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nl_get_proto_name(int proto)
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{
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return (nl_handlers[proto].proto_name);
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}
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bool
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netlink_register_proto(int proto, const char *proto_name, nl_handler_f handler)
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{
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if ((proto < 0) || (proto >= NL_MAX_HANDLERS))
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return (false);
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NL_GLOBAL_LOCK();
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KASSERT((nl_handlers[proto].cb == NULL), ("netlink handler %d is already set", proto));
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nl_handlers[proto].cb = handler;
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nl_handlers[proto].proto_name = proto_name;
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NL_GLOBAL_UNLOCK();
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NL_LOG(LOG_DEBUG2, "Registered netlink %s(%d) handler", proto_name, proto);
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return (true);
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}
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bool
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netlink_unregister_proto(int proto)
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{
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if ((proto < 0) || (proto >= NL_MAX_HANDLERS))
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return (false);
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NL_GLOBAL_LOCK();
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KASSERT((nl_handlers[proto].cb != NULL), ("netlink handler %d is not set", proto));
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nl_handlers[proto].cb = NULL;
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nl_handlers[proto].proto_name = NULL;
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NL_GLOBAL_UNLOCK();
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NL_LOG(LOG_DEBUG2, "Unregistered netlink proto %d handler", proto);
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return (true);
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}
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#if !defined(NETLINK) && defined(NETLINK_MODULE)
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/* Non-stub function provider */
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const static struct nl_function_wrapper nl_module = {
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.nlmsg_add = _nlmsg_add,
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.nlmsg_refill_buffer = _nlmsg_refill_buffer,
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.nlmsg_flush = _nlmsg_flush,
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.nlmsg_end = _nlmsg_end,
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.nlmsg_abort = _nlmsg_abort,
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.nlmsg_get_unicast_writer = _nlmsg_get_unicast_writer,
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.nlmsg_get_group_writer = _nlmsg_get_group_writer,
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.nlmsg_get_chain_writer = _nlmsg_get_chain_writer,
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.nlmsg_end_dump = _nlmsg_end_dump,
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.nl_modify_ifp_generic = _nl_modify_ifp_generic,
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.nl_store_ifp_cookie = _nl_store_ifp_cookie,
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.nl_get_thread_nlp = _nl_get_thread_nlp,
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};
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#endif
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static bool
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can_unload(void)
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{
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struct nl_control *ctl;
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bool result = true;
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NL_GLOBAL_LOCK();
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CK_LIST_FOREACH(ctl, &vnets_head, ctl_next) {
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NL_LOG(LOG_DEBUG2, "Iterating VNET head %p", ctl);
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if (!CK_LIST_EMPTY(&ctl->ctl_pcb_head)) {
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NL_LOG(LOG_NOTICE, "non-empty socket list in ctl %p", ctl);
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result = false;
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break;
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}
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}
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NL_GLOBAL_UNLOCK();
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return (result);
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}
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static int
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netlink_modevent(module_t mod __unused, int what, void *priv __unused)
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{
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int ret = 0;
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switch (what) {
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case MOD_LOAD:
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NL_LOG(LOG_DEBUG2, "Loading");
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nl_init_msg_zone();
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nl_osd_register();
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#if !defined(NETLINK) && defined(NETLINK_MODULE)
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nl_set_functions(&nl_module);
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#endif
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break;
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case MOD_UNLOAD:
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NL_LOG(LOG_DEBUG2, "Unload called");
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if (can_unload()) {
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NL_LOG(LOG_WARNING, "unloading");
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netlink_unloading = 1;
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#if !defined(NETLINK) && defined(NETLINK_MODULE)
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nl_set_functions(NULL);
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#endif
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nl_osd_unregister();
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nl_destroy_msg_zone();
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} else
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ret = EBUSY;
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break;
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default:
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ret = EOPNOTSUPP;
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break;
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}
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return (ret);
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}
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static moduledata_t netlink_mod = { "netlink", netlink_modevent, NULL };
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DECLARE_MODULE(netlink, netlink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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MODULE_VERSION(netlink, 1);
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