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annotate src/if.h @ 5570:f32e37b1d371 draft

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dhcpcd: Don't roam when anonymous is set We can now remove the NOCARRIER_PRESERVE_IP define.
author Roy Marples <roy@marples.name>
date Sun, 27 Dec 2020 21:59:32 +0000
parents e65d193a1960
children
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c7df03794de3 Add SPDX identifiers to all dhcpcd source files.
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1 /* SPDX-License-Identifier: BSD-2-Clause */
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2 /*
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3 * dhcpcd - DHCP client daemon
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555d7d1a4939 Welcome to 2020!
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4 * Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
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5 * All rights reserved
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6
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #ifndef INTERFACE_H
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30 #define INTERFACE_H
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31
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32 #include <net/if.h>
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33 #include <net/route.h> /* for RTM_ADD et all */
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34 #include <netinet/in.h>
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35 #ifdef BSD
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36 #include <netinet/in_var.h> /* for IN_IFF_TENTATIVE et all */
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37 #endif
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38
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39 #include <ifaddrs.h>
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40
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41 /* If the interface does not support carrier status (ie PPP),
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42 * dhcpcd can poll it for the relevant flags periodically */
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43 #define IF_POLL_UP 100 /* milliseconds */
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44
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45 /*
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46 * Systems which handle 1 address per alias.
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47 * Currenly this is just Solaris.
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48 * While Linux can do aliased addresses, it is only useful for their
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49 * legacy ifconfig(8) tool which cannot display >1 IPv4 address
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50 * (it can display many IPv6 addresses which makes the limitation odd).
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51 * Linux has ip(8) which is a more feature rich tool, without the above
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52 * restriction.
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53 */
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54 #ifndef ALIAS_ADDR
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55 # ifdef __sun
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56 # define ALIAS_ADDR
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57 # endif
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58 #endif
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59
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60 #include "config.h"
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61
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62 /* POSIX defines ioctl request as an int, which Solaris and musl use.
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63 * Everyone else use an unsigned long, which happens to be the bigger one
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64 * so we use that in our on wire API. */
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65 #ifdef IOCTL_REQUEST_TYPE
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66 typedef IOCTL_REQUEST_TYPE ioctl_request_t;
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67 #else
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68 typedef unsigned long ioctl_request_t;
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69 #endif
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70
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71 #include "dhcpcd.h"
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72 #include "ipv4.h"
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73 #include "ipv6.h"
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74 #include "route.h"
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75
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76 #define EUI64_ADDR_LEN 8
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77 #define INFINIBAND_ADDR_LEN 20
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78
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79 /* Linux 2.4 doesn't define this */
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80 #ifndef ARPHRD_IEEE1394
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81 # define ARPHRD_IEEE1394 24
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82 #endif
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83
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84 /* The BSD's don't define this yet */
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85 #ifndef ARPHRD_INFINIBAND
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86 # define ARPHRD_INFINIBAND 32
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87 #endif
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88
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89 /* Maximum frame length.
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90 * Support jumbo frames and some extra. */
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91 #define FRAMEHDRLEN_MAX 14 /* only ethernet support */
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92 #define FRAMELEN_MAX (FRAMEHDRLEN_MAX + 9216)
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93
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94 #define UDPLEN_MAX 64 * 1024
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95
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96 /* Work out if we have a private address or not
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97 * 10/8
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98 * 172.16/12
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99 * 192.168/16
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100 */
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101 #ifndef IN_PRIVATE
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102 # define IN_PRIVATE(addr) (((addr & IN_CLASSA_NET) == 0x0a000000) || \
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103 ((addr & 0xfff00000) == 0xac100000) || \
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104 ((addr & IN_CLASSB_NET) == 0xc0a80000))
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105 #endif
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106
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107 #ifndef CLLADDR
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108 #ifdef AF_LINK
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109 # define CLLADDR(sdl) (const void *)((sdl)->sdl_data + (sdl)->sdl_nlen)
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110 #endif
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111 #endif
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112
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113 #ifdef __sun
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114 /* Solaris stupidly defines this for compat with BSD
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115 * but then ignores it. */
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116 #undef RTF_CLONING
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117
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118 /* This interface is busted on DilOS at least.
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119 * It used to work, but lukily Solaris can fall back to
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120 * IP_PKTINFO. */
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121 #undef IP_RECVIF
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122
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123 /* Solaris getifaddrs is very un-suitable for dhcpcd.
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124 * See if-sun.c for details why. */
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125 struct ifaddrs;
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126 int if_getifaddrs(struct ifaddrs **);
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127 #define getifaddrs if_getifaddrs
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128 int if_getsubnet(struct dhcpcd_ctx *, const char *, int, void *, size_t);
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129 #endif
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130
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131 int if_ioctl(struct dhcpcd_ctx *, ioctl_request_t, void *, size_t);
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132 #ifdef HAVE_PLEDGE
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133 #define pioctl(ctx, req, data, len) if_ioctl((ctx), (req), (data), (len))
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134 #else
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135 #define pioctl(ctx, req, data, len) ioctl((ctx)->pf_inet_fd, (req),(data),(len))
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136 #endif
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137 int if_getflags(struct interface *);
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138 int if_setflag(struct interface *, short, short);
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139 #define if_up(ifp) if_setflag((ifp), (IFF_UP | IFF_RUNNING), 0)
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140 #define if_down(ifp) if_setflag((ifp), 0, IFF_UP);
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6a2da5651841 dhcpcd: Simplify the link handling even more
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141 bool if_is_link_up(const struct interface *);
4076
9433864aa014 Hardware Address validation
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142 bool if_valid_hwaddr(const uint8_t *, size_t);
4189
0b088d803b61 dhcp6: don't listen on IPv6 addresses when not using DHCP6
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143 struct if_head *if_discover(struct dhcpcd_ctx *, struct ifaddrs **,
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144 int, char * const *);
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145 void if_markaddrsstale(struct if_head *);
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146 void if_learnaddrs(struct dhcpcd_ctx *, struct if_head *, struct ifaddrs **);
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147 void if_deletestaleaddrs(struct if_head *);
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148 struct interface *if_find(struct if_head *, const char *);
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149 struct interface *if_findindex(struct if_head *, unsigned int);
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150 struct interface *if_loopback(struct dhcpcd_ctx *);
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151 void if_free(struct interface *);
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152 int if_domtu(const struct interface *, short int);
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153 #define if_getmtu(ifp) if_domtu((ifp), 0)
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154 #define if_setmtu(ifp, mtu) if_domtu((ifp), (mtu))
5486
8e2b8ce8c972 BSD: struct if_data->ifi_link_state is the single source of truth
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155 int if_carrier(struct interface *, const void *);
5557
e65d193a1960 Linux: Support wireless IP roaming
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156 bool if_roaming(struct interface *);
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157
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158 #ifdef ALIAS_ADDR
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159 int if_makealias(char *, size_t, const char *, int);
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160 #endif
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161
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4262dbc903e8 sun: Fix carrier detection, MTU detection and plumbing
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162 int if_mtu_os(const struct interface *);
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163
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164 /*
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165 * Helper to decode an interface name of bge0:1 to
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166 * devname = bge0, drvname = bge0, ppa = 0, lun = 1.
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167 * If ppa or lun are invalid they are set to -1.
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168 */
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169 struct if_spec {
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170 char ifname[IF_NAMESIZE];
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171 char devname[IF_NAMESIZE];
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172 char drvname[IF_NAMESIZE];
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173 int ppa;
5071
e09697275eda if: Decode vlid from the interface name
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174 int vlid;
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175 int lun;
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176 };
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177 int if_nametospec(const char *, struct if_spec *);
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178
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179 /* The below functions are provided by if-KERNEL.c */
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dd8347a0ea1c Adjust prior so that message is logged before starting dev
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180 int os_init(void);
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181 int if_conf(struct interface *);
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182 int if_init(struct interface *);
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183 int if_getssid(struct interface *);
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0a6bde63868b privsep: Remove pledges inet and dns from the master process
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184 int if_ignoregroup(int, const char *);
4748
4cfd9d38741f BSD: Ignore interface groups as we would the interface name
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185 bool if_ignore(struct dhcpcd_ctx *, const char *);
5204
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186 int if_vimaster(struct dhcpcd_ctx *ctx, const char *);
4052
08038b46c0f5 Detect VLANID to use in IAID.
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187 unsigned short if_vlanid(const struct interface *);
5457
7fb0274b9127 Linux: detect network namespace and deny udev in one
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diff changeset
188 char * if_getnetworknamespace(char *, size_t);
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189 int if_opensockets(struct dhcpcd_ctx *);
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190 int if_opensockets_os(struct dhcpcd_ctx *);
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191 void if_closesockets(struct dhcpcd_ctx *);
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192 void if_closesockets_os(struct dhcpcd_ctx *);
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193 int if_handlelink(struct dhcpcd_ctx *);
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194 int if_randomisemac(struct interface *);
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195 int if_setmac(struct interface *ifp, void *, uint8_t);
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196
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197 /* dhcpcd uses the same routing flags as BSD.
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198 * If the platform doesn't use these flags,
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199 * map them in the platform interace file. */
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200 #ifndef RTM_ADD
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201 #define RTM_ADD 0x1 /* Add Route */
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202 #define RTM_DELETE 0x2 /* Delete Route */
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203 #define RTM_CHANGE 0x3 /* Change Metrics or flags */
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204 #define RTM_GET 0x4 /* Report Metrics */
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205 #endif
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206
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207 /* Define SOCK_CLOEXEC and SOCK_NONBLOCK for systems that lack it.
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208 * xsocket() in if.c will map them to fctnl FD_CLOEXEC and O_NONBLOCK. */
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209 #ifdef SOCK_CLOEXEC
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210 # define HAVE_SOCK_CLOEXEC
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211 #else
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212 # define SOCK_CLOEXEC 0x10000000
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213 #endif
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214 #ifdef SOCK_NONBLOCK
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215 # define HAVE_SOCK_NONBLOCK
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216 #else
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217 # define SOCK_NONBLOCK 0x20000000
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218 #endif
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a2c342295221 privsep: Enable Capsicum for all processes.
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219 #ifndef SOCK_CXNB
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220 #define SOCK_CXNB SOCK_CLOEXEC | SOCK_NONBLOCK
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221 #endif
5436
56c934c73aa8 if: introduce xsocketpair, similar to xsocket
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222 int xsocket(int, int, int);
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223 int xsocketpair(int, int, int, int[2]);
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224
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225 int if_route(unsigned char, const struct rt *rt);
4400
2d6a2c8c6b56 route: Remove kroutes and make froutes optional
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226 int if_initrt(struct dhcpcd_ctx *, rb_tree_t *, int);
3983
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227
5057
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
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228 int if_missfilter(struct interface *, struct sockaddr *);
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229 int if_missfilter_apply(struct dhcpcd_ctx *);
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230
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231 #ifdef INET
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232 int if_address(unsigned char, const struct ipv4_addr *);
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233 int if_addrflags(const struct interface *, const struct in_addr *,
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234 const char *);
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235
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236 #endif
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237
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238 #ifdef INET6
4799
95842881a2ef BSD: Disable kernel RTADV sysctl earlier
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diff changeset
239 void if_disable_rtadv(void);
4218
f618f850efdc inet6: simplify setup of kernel
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diff changeset
240 void if_setup_inet6(const struct interface *);
4335
d0519e1f2f5f ip6: Implement IPv6 address sharing
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diff changeset
241 int ip6_forwarding(const char *ifname);
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242
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243 struct ra;
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244 struct ipv6_addr;
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245
4813
ef33eb73e97d INET6: Apply hoplimit, reachable and retrans timer values from RA.
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246 int if_applyra(const struct ra *);
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247 int if_address6(unsigned char, const struct ipv6_addr *);
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248 int if_addrflags6(const struct interface *, const struct in6_addr *,
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249 const char *);
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250 int if_getlifetime6(struct ipv6_addr *);
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251
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252 #else
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253 #define if_checkipv6(a, b, c) (-1)
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254 #endif
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255
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256 int if_machinearch(char *, size_t);
4374
d67204739087 Fold all CMSG parsing into a common function.
Roy Marples <roy@marples.name>
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257 struct interface *if_findifpfromcmsg(struct dhcpcd_ctx *,
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258 struct msghdr *, int *);
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259
073fcd86db9b privsep: Add support for priviledge separation
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260 #ifdef __linux__
5282
8afafcabcfa5 privsep: Drain the link socket as we can't re-open it.
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261 int if_linksocket(struct sockaddr_nl *, int, int);
4840
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262 int if_getnetlink(struct dhcpcd_ctx *, struct iovec *, int, int,
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263 int (*)(struct dhcpcd_ctx *, void *, struct nlmsghdr *), void *);
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264 #endif
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265 #endif