1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - route management 4 * Copyright (c) 2006-2025 Roy Marples <roy (at) marples.name> 5 * All rights reserved 6 7 * rEDISTRIBUTION AND USE IN SOURCE AND BINARY FORMS, WITH OR WITHOUT 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef ROUTE_H 30 #define ROUTE_H 31 32 #ifdef HAVE_SYS_RBTREE_H 33 #include <sys/rbtree.h> 34 #else 35 #include "rbtree.h" 36 #endif 37 38 #include <sys/socket.h> 39 #include <net/route.h> 40 41 #include <stdbool.h> 42 43 #include "dhcpcd.h" 44 #include "sa.h" 45 46 /* 47 * Enable the route free list by default as 48 * memory usage is still reported as low/unchanged even 49 * when dealing with millions of routes. 50 */ 51 #if !defined(RT_FREE_ROUTE_TABLE) 52 #define RT_FREE_ROUTE_TABLE 1 53 #elif RT_FREE_ROUTE_TABLE == 0 54 #undef RT_FREE_ROUTE_TABLE 55 #endif 56 57 /* Some systems have route metrics. 58 * OpenBSD route priority is not this. */ 59 #ifndef HAVE_ROUTE_METRIC 60 # if defined(__linux__) 61 # define HAVE_ROUTE_METRIC 1 62 # endif 63 #endif 64 65 #ifdef __linux__ 66 # include <linux/version.h> /* RTA_PREF is only an enum.... */ 67 # if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0) 68 # define HAVE_ROUTE_PREF 69 # endif 70 # if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) 71 # define HAVE_ROUTE_LIFETIME /* For IPv6 routes only */ 72 # endif 73 #endif 74 75 #if defined(__OpenBSD__) || defined (__sun) 76 # define ROUTE_PER_GATEWAY 77 /* XXX dhcpcd doesn't really support this yet. 78 * But that's generally OK if only dhcpcd is managing routes. */ 79 #endif 80 81 /* OpenBSD defines this as a "convienience" ..... we work around it. */ 82 #ifdef __OpenBSD__ 83 #undef rt_mtu 84 #endif 85 86 struct rt { 87 union sa_ss rt_ss_dest; 88 #define rt_dest rt_ss_dest.sa 89 union sa_ss rt_ss_netmask; 90 #define rt_netmask rt_ss_netmask.sa 91 union sa_ss rt_ss_gateway; 92 #define rt_gateway rt_ss_gateway.sa 93 struct interface *rt_ifp; 94 union sa_ss rt_ss_ifa; 95 #define rt_ifa rt_ss_ifa.sa 96 unsigned int rt_flags; 97 unsigned int rt_mtu; 98 #ifdef HAVE_ROUTE_METRIC 99 unsigned int rt_metric; 100 #endif 101 /* Maximum interface index is generally USHORT_MAX or 65535. 102 * Add some padding for other stuff and we get offsets for the 103 * below that should work automatically. 104 * This is only an issue if the user defines higher metrics in 105 * their configuration, but then they might wish to override also. */ 106 #define RTMETRIC_BASE 1000U 107 #define RTMETRIC_WIRELESS 2000U 108 #define RTMETRIC_IPV4LL 1000000U 109 #define RTMETRIC_ROAM 2000000U 110 #ifdef HAVE_ROUTE_PREF 111 int rt_pref; 112 #endif 113 #define RTPREF_HIGH 1 114 #define RTPREF_MEDIUM 0 /* has to be zero */ 115 #define RTPREF_LOW (-1) 116 #define RTPREF_RESERVED (-2) 117 #define RTPREF_INVALID (-3) /* internal */ 118 unsigned int rt_dflags; 119 #define RTDF_IFA_ROUTE 0x01 /* Address generated route */ 120 #define RTDF_FAKE 0x02 /* Maybe us on lease reboot */ 121 #define RTDF_IPV4LL 0x04 /* IPv4LL route */ 122 #define RTDF_RA 0x08 /* Router Advertisement */ 123 #define RTDF_DHCP 0x10 /* DHCP route */ 124 #define RTDF_STATIC 0x20 /* Configured in dhcpcd */ 125 #define RTDF_GATELINK 0x40 /* Gateway is on link */ 126 size_t rt_order; 127 rb_node_t rt_tree; 128 #ifdef HAVE_ROUTE_LIFETIME 129 struct timespec rt_aquired; /* timestamp of aquisition */ 130 uint32_t rt_lifetime; /* current lifetime of route */ 131 #define RTLIFETIME_DEV_MAX 2 /* max deviation for cmp */ 132 #endif 133 }; 134 135 extern const rb_tree_ops_t rt_compare_list_ops; 136 extern const rb_tree_ops_t rt_compare_proto_ops; 137 138 void rt_init(struct dhcpcd_ctx *); 139 void rt_dispose(struct dhcpcd_ctx *); 140 void rt_free(struct rt *); 141 void rt_freeif(struct interface *); 142 bool rt_is_default(const struct rt *); 143 void rt_headclear0(struct dhcpcd_ctx *, rb_tree_t *, int); 144 void rt_headclear(rb_tree_t *, int); 145 void rt_headfreeif(rb_tree_t *); 146 struct rt * rt_new0(struct dhcpcd_ctx *); 147 void rt_setif(struct rt *, struct interface *); 148 struct rt * rt_new(struct interface *); 149 struct rt * rt_proto_add_ctx(rb_tree_t *, struct rt *, struct dhcpcd_ctx *); 150 struct rt * rt_proto_add(rb_tree_t *, struct rt *); 151 int rt_cmp_dest(const struct rt *, const struct rt *); 152 void rt_recvrt(int, const struct rt *, pid_t); 153 void rt_build(struct dhcpcd_ctx *, int); 154 155 #endif 156
Indexes created Sat Jun 13 00:24:39 UTC 2026