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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* dhcpcd - route management
* Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
* 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.
*
* 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.
*/
#ifndef ROUTE_H
#define ROUTE_H
#ifdef HAVE_SYS_RBTREE_H
#include <sys/rbtree.h>
#endif
#include <sys/socket.h>
#include <net/route.h>
#include <stdbool.h>
#include "dhcpcd.h"
#include "sa.h"
/*
* Enable the route free list by default as
* memory usage is still reported as low/unchanged even
* when dealing with millions of routes.
*/
#if !defined(RT_FREE_ROUTE_TABLE)
#define RT_FREE_ROUTE_TABLE 1
#elif RT_FREE_ROUTE_TABLE == 0
#undef RT_FREE_ROUTE_TABLE
#endif
/* Some systems have route metrics.
* OpenBSD route priority is not this. */
#ifndef HAVE_ROUTE_METRIC
# if defined(__linux__)
# define HAVE_ROUTE_METRIC 1
# endif
#endif
#ifdef __linux__
# include <linux/version.h> /* RTA_PREF is only an enum.... */
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
# define HAVE_ROUTE_PREF
# endif
#endif
#if defined(__OpenBSD__) || defined (__sun)
# define ROUTE_PER_GATEWAY
/* XXX dhcpcd doesn't really support this yet.
* But that's generally OK if only dhcpcd is managing routes. */
#endif
/* OpenBSD defines this as a "convienience" ..... we work around it. */
#ifdef __OpenBSD__
#undef rt_mtu
#endif
struct rt {
union sa_ss rt_ss_dest;
#define rt_dest rt_ss_dest.sa
union sa_ss rt_ss_netmask;
#define rt_netmask rt_ss_netmask.sa
union sa_ss rt_ss_gateway;
#define rt_gateway rt_ss_gateway.sa
struct interface *rt_ifp;
union sa_ss rt_ss_ifa;
#define rt_ifa rt_ss_ifa.sa
unsigned int rt_flags;
unsigned int rt_mtu;
#ifdef HAVE_ROUTE_METRIC
unsigned int rt_metric;
#endif
/* Maximum interface index is generally USHORT_MAX or 65535.
* Add some padding for other stuff and we get offsets for the
* below that should work automatically.
* This is only an issue if the user defines higher metrics in
* their configuration, but then they might wish to override also. */
#define RTMETRIC_BASE 1000U
#define RTMETRIC_WIRELESS 2000U
#define RTMETRIC_IPV4LL 1000000U
#define RTMETRIC_ROAM 2000000U
#ifdef HAVE_ROUTE_PREF
int rt_pref;
#endif
#define RTPREF_HIGH 1
#define RTPREF_MEDIUM 0 /* has to be zero */
#define RTPREF_LOW (-1)
#define RTPREF_RESERVED (-2)
#define RTPREF_INVALID (-3) /* internal */
unsigned int rt_dflags;
#define RTDF_IFA_ROUTE 0x01 /* Address generated route */
#define RTDF_FAKE 0x02 /* Maybe us on lease reboot */
#define RTDF_IPV4LL 0x04 /* IPv4LL route */
#define RTDF_RA 0x08 /* Router Advertisement */
#define RTDF_DHCP 0x10 /* DHCP route */
#define RTDF_STATIC 0x20 /* Configured in dhcpcd */
#define RTDF_GATELINK 0x40 /* Gateway is on link */
size_t rt_order;
rb_node_t rt_tree;
};
extern const rb_tree_ops_t rt_compare_list_ops;
extern const rb_tree_ops_t rt_compare_proto_ops;
void rt_init(struct dhcpcd_ctx *);
void rt_dispose(struct dhcpcd_ctx *);
void rt_free(struct rt *);
void rt_freeif(struct interface *);
bool rt_is_default(const struct rt *);
void rt_headclear0(struct dhcpcd_ctx *, rb_tree_t *, int);
void rt_headclear(rb_tree_t *, int);
void rt_headfreeif(rb_tree_t *);
struct rt * rt_new0(struct dhcpcd_ctx *);
void rt_setif(struct rt *, struct interface *);
struct rt * rt_new(struct interface *);
struct rt * rt_proto_add_ctx(rb_tree_t *, struct rt *, struct dhcpcd_ctx *);
struct rt * rt_proto_add(rb_tree_t *, struct rt *);
int rt_cmp_dest(const struct rt *, const struct rt *);
void rt_recvrt(int, const struct rt *, pid_t);
void rt_build(struct dhcpcd_ctx *, int);
#endif
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