2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
32 #include <sys/epoch.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/socket.h>
37 #include <net/route.h>
38 #include <net/route/route_ctl.h>
39 #include <netlink/netlink.h>
40 #include <netlink/netlink_ctl.h>
41 #include <netlink/netlink_route.h>
42 #include <netlink/route/route_var.h>
44 #define DEBUG_MOD_NAME nl_route_core
45 #define DEBUG_MAX_LEVEL LOG_DEBUG3
46 #include <netlink/netlink_debug.h>
47 _DECLARE_DEBUG(LOG_DEBUG);
49 #define HANDLER_MAX_NUM (NL_RTM_MAX + 10)
50 static const struct rtnl_cmd_handler *rtnl_handler[HANDLER_MAX_NUM] = {};
53 rtnl_register_messages(const struct rtnl_cmd_handler *handlers, int count)
55 for (int i = 0; i < count; i++) {
56 if (handlers[i].cmd >= HANDLER_MAX_NUM)
58 MPASS(rtnl_handler[handlers[i].cmd] == NULL);
60 for (int i = 0; i < count; i++)
61 rtnl_handler[handlers[i].cmd] = &handlers[i];
66 * Handler called by netlink subsystem when matching netlink message is received
69 rtnl_handle_message(struct nlmsghdr *hdr, struct nl_pstate *npt)
71 const struct rtnl_cmd_handler *cmd;
72 struct epoch_tracker et;
73 struct nlpcb *nlp = npt->nlp;
76 if (__predict_false(hdr->nlmsg_type >= HANDLER_MAX_NUM)) {
77 NLMSG_REPORT_ERR_MSG(npt, "unknown message type: %d", hdr->nlmsg_type);
81 cmd = rtnl_handler[hdr->nlmsg_type];
82 if (__predict_false(cmd == NULL)) {
83 NLMSG_REPORT_ERR_MSG(npt, "unknown message type: %d", hdr->nlmsg_type);
87 NLP_LOG(LOG_DEBUG2, nlp, "received msg %s(%d) len %d", cmd->name,
88 hdr->nlmsg_type, hdr->nlmsg_len);
90 if (cmd->priv != 0 && !nlp_has_priv(nlp, cmd->priv)) {
91 NLP_LOG(LOG_DEBUG2, nlp, "priv %d check failed for msg %s", cmd->priv, cmd->name);
93 } else if (cmd->priv != 0)
94 NLP_LOG(LOG_DEBUG3, nlp, "priv %d check passed for msg %s", cmd->priv, cmd->name);
96 bool need_epoch = !(cmd->flags & RTNL_F_NOEPOCH);
100 error = cmd->cb(hdr, nlp, npt);
104 NLP_LOG(LOG_DEBUG3, nlp, "message %s -> error %d", cmd->name, error);
109 static struct rtbridge nlbridge = {
110 .route_f = rtnl_handle_route_event,
111 .ifmsg_f = rtnl_handle_ifnet_event,
113 static struct rtbridge *nlbridge_orig_p;
116 rtnl_load(void *u __unused)
118 NL_LOG(LOG_NOTICE, "rtnl loading");
119 nlbridge_orig_p = netlink_callback_p;
120 netlink_callback_p = &nlbridge;
123 rtnl_nexthops_init();
125 netlink_register_proto(NETLINK_ROUTE, "NETLINK_ROUTE", rtnl_handle_message);
127 SYSINIT(rtnl_load, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rtnl_load, NULL);
130 rtnl_unload(void *u __unused)
132 netlink_callback_p = nlbridge_orig_p;
133 rtnl_ifaces_destroy();
134 rtnl_neighs_destroy();
136 /* Wait till all consumers read nlbridge data */
139 SYSUNINIT(rtnl_unload, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rtnl_unload, NULL);