/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1980, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)route.c 8.3.1.1 (Berkeley) 2/23/95
*/
#include "opt_route.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/route/nhop.h>
#include <net/vnet.h>
#include <netinet/in.h>
/*
* Control interface address fib propagation.
* By default, interface address routes are added to the fib of the interface.
* Once set to non-zero, adds interface address route to all fibs.
*/
VNET_DEFINE(u_int, rt_add_addr_allfibs) = 0;
SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET,
&VNET_NAME(rt_add_addr_allfibs), 0, "");
/*
* Executes routing tables change specified by @cmd and @info for the fib
* @fibnum. Generates routing message on success.
* Note: it assumes there is only single route (interface route) for the
* provided prefix.
* Returns 0 on success or errno.
*/
static int
rib_handle_ifaddr_one(uint32_t fibnum, int cmd, struct rt_addrinfo *info)
{
struct rib_cmd_info rc;
struct nhop_object *nh;
int error;
error = rib_action(fibnum, cmd, info, &rc);
if (error == 0) {
if (cmd == RTM_ADD)
nh = nhop_select(rc.rc_nh_new, 0);
else
nh = nhop_select(rc.rc_nh_old, 0);
rt_routemsg(cmd, rc.rc_rt, nh, fibnum);
}
return (error);
}
/*
* Adds/deletes interface prefix specified by @info to the routing table.
* If V_rt_add_addr_allfibs is set, iterates over all existing routing
* tables, otherwise uses fib in @fibnum. Generates routing message for
* each table.
* Returns 0 on success or errno.
*/
int
rib_handle_ifaddr_info(uint32_t fibnum, int cmd, struct rt_addrinfo *info)
{
int error = 0, last_error = 0;
bool didwork = false;
if (V_rt_add_addr_allfibs == 0) {
error = rib_handle_ifaddr_one(fibnum, cmd, info);
didwork = (error == 0);
} else {
for (fibnum = 0; fibnum < V_rt_numfibs; fibnum++) {
error = rib_handle_ifaddr_one(fibnum, cmd, info);
if (error == 0)
didwork = true;
else
last_error = error;
}
}
if (cmd == RTM_DELETE) {
if (didwork) {
error = 0;
} else {
/* we only give an error if it wasn't in any table */
error = ((info->rti_flags & RTF_HOST) ?
EHOSTUNREACH : ENETUNREACH);
}
} else {
if (last_error != 0) {
/* return an error if any of them failed */
error = last_error;
}
}
return (error);
}
static int
ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa,
struct sockaddr *ia)
{
struct rib_cmd_info rc;
struct epoch_tracker et;
int error;
struct rt_addrinfo info;
struct sockaddr_dl null_sdl;
struct ifnet *ifp;
ifp = ifa->ifa_ifp;
NET_EPOCH_ENTER(et);
bzero(&info, sizeof(info));
if (cmd != RTM_DELETE)
info.rti_ifp = V_loif;
if (cmd == RTM_ADD) {
/* explicitly specify (loopback) ifa */
if (info.rti_ifp != NULL)
info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp);
}
info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED;
info.rti_info[RTAX_DST] = ia;
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type);
error = rib_action(ifp->if_fib, cmd, &info, &rc);
NET_EPOCH_EXIT(et);
if (error == 0 ||
(cmd == RTM_ADD && error == EEXIST) ||
(cmd == RTM_DELETE && (error == ENOENT || error == ESRCH)))
return (error);
log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n",
__func__, otype, if_name(ifp), error);
return (error);
}
int
ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
{
return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia));
}
int
ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
{
return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia));
}
int
ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
{
return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia));
}
static bool
match_kernel_route(const struct rtentry *rt, struct nhop_object *nh)
{
if (!NH_IS_NHGRP(nh) && (nhop_get_rtflags(nh) & RTF_PINNED) &&
nh->nh_aifp->if_fib == nhop_get_fibnum(nh))
return (true);
return (false);
}
static int
pick_kernel_route(struct rtentry *rt, void *arg)
{
struct nhop_object *nh = rt->rt_nhop;
struct rib_head *rh_dst = (struct rib_head *)arg;
if (match_kernel_route(rt, nh)) {
struct rib_cmd_info rc = {};
struct route_nhop_data rnd = {
.rnd_nhop = nh,
.rnd_weight = rt->rt_weight,
};
rib_copy_route(rt, &rnd, rh_dst, &rc);
}
return (0);
}
/*
* Tries to copy kernel routes matching pattern from @rh_src to @rh_dst.
*
* Note: as this function acquires locks for both @rh_src and @rh_dst,
* it needs to be called under RTABLES_LOCK() to avoid deadlocking
* with multiple ribs.
*/
void
rib_copy_kernel_routes(struct rib_head *rh_src, struct rib_head *rh_dst)
{
struct epoch_tracker et;
if (V_rt_add_addr_allfibs == 0)
return;
NET_EPOCH_ENTER(et);
rib_walk_ext_internal(rh_src, false, pick_kernel_route, NULL, rh_dst);
NET_EPOCH_EXIT(et);
}
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