contrib/dhcpcd/src/route.h

   1 /* SPDX-License-Identifier: BSD-2-Clause */
   2 /*
   3  * dhcpcd - route management
   4  * Copyright (c) 2006-2019 Roy Marples <roy@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 #endif
  35
  36 #include <sys/socket.h>
  37 #include <net/route.h>
  38
  39 #include <stdbool.h>
  40
  41 #include "dhcpcd.h"
  42 #include "sa.h"
  43
  44 /*
  45  * Enable the route free list by default as
  46  * memory usage is still reported as low/unchanged even
  47  * when dealing with millions of routes.
  48  */
  49 #if !defined(RT_FREE_ROUTE_TABLE)
  50 #define RT_FREE_ROUTE_TABLE 1
  51 #elif RT_FREE_ROUTE_TABLE == 0
  52 #undef  RT_FREE_ROUTE_TABLE
  53 #endif
  54
  55 /* Some systems have route metrics.
  56  * OpenBSD route priority is not this. */
  57 #ifndef HAVE_ROUTE_METRIC
  58 # if defined(__linux__)
  59 #  define HAVE_ROUTE_METRIC 1
  60 # endif
  61 #endif
  62
  63 #if defined(__OpenBSD__) || defined (__sun)
  64 #  define ROUTE_PER_GATEWAY
  65 /* XXX dhcpcd doesn't really support this yet.
  66  * But that's generally OK if only dhcpcd is managing routes. */
  67 #endif
  68
  69 /* OpenBSD defines this as a "convienience" ..... we work around it. */
  70 #ifdef __OpenBSD__
  71 #undef rt_mtu
  72 #endif
  73
  74 struct rt {
  75         union sa_ss             rt_ss_dest;
  76 #define rt_dest                 rt_ss_dest.sa
  77         union sa_ss             rt_ss_netmask;
  78 #define rt_netmask              rt_ss_netmask.sa
  79         union sa_ss             rt_ss_gateway;
  80 #define rt_gateway              rt_ss_gateway.sa
  81         struct interface        *rt_ifp;
  82         union sa_ss             rt_ss_ifa;
  83 #define rt_ifa                  rt_ss_ifa.sa
  84         unsigned int            rt_flags;
  85         unsigned int            rt_mtu;
  86 #ifdef HAVE_ROUTE_METRIC
  87         unsigned int            rt_metric;
  88 #endif
  89         unsigned int            rt_dflags;
  90 #define RTDF_IFA_ROUTE          0x02            /* Address generated route */
  91 #define RTDF_FAKE               0x04            /* Maybe us on lease reboot  */
  92 #define RTDF_RA                 0x08            /* Router Advertisement */
  93 #define RTDF_DHCP               0x10            /* DHCP route */
  94 #define RTDF_STATIC             0x20            /* Configured in dhcpcd */
  95 #define RTDF_GATELINK           0x40            /* Gateway is on link */
  96         size_t                  rt_order;
  97         rb_node_t               rt_tree;
  98 };
  99
 100 extern const rb_tree_ops_t rt_compare_list_ops;
 101 extern const rb_tree_ops_t rt_compare_proto_ops;
 102
 103 void rt_init(struct dhcpcd_ctx *);
 104 void rt_dispose(struct dhcpcd_ctx *);
 105 void rt_free(struct rt *);
 106 void rt_freeif(struct interface *);
 107 bool rt_is_default(const struct rt *);
 108 void rt_headclear0(struct dhcpcd_ctx *, rb_tree_t *, int);
 109 void rt_headclear(rb_tree_t *, int);
 110 void rt_headfreeif(rb_tree_t *);
 111 struct rt * rt_new0(struct dhcpcd_ctx *);
 112 void rt_setif(struct rt *, struct interface *);
 113 struct rt * rt_new(struct interface *);
 114 struct rt * rt_proto_add_ctx(rb_tree_t *, struct rt *, struct dhcpcd_ctx *);
 115 struct rt * rt_proto_add(rb_tree_t *, struct rt *);
 116 int rt_cmp_dest(const struct rt *, const struct rt *);
 117 void rt_recvrt(int, const struct rt *, pid_t);
 118 void rt_build(struct dhcpcd_ctx *, int);
 119
 120 #endif