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annotate src/if.h @ 5557:e65d193a1960 draft

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Linux: Support wireless IP roaming This is achieved by checking that the interface is wireless, IFF_UP and IFF_LOWER_UP are present, but IFF_RUNNING is missing. This gives exactly the same support as modern NetBSD when carrier loss is detected, but without the address verifications when the carrier comes back as that needs to be handled in the kernel. While IP setup is maintained, other configuration data is discarded. Note that this should be improved in the future. Thanks to Boris Krasnovskiy <borkra@gmail.com> for helping with this.
author Roy Marples <roy@marples.name>
date Sat, 12 Dec 2020 13:12:26 +0000
parents 6a2da5651841
children f32e37b1d371
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rev   line source
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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 /* Some systems have in-built IPv4 DAD.
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46 * However, we need them to do DAD at carrier up as well. */
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47 #ifdef IN_IFF_TENTATIVE
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48 # ifdef __NetBSD__
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49 # define NOCARRIER_PRESERVE_IP
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50 # endif
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51 #endif
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52
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53 /*
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54 * Systems which handle 1 address per alias.
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55 * Currenly this is just Solaris.
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56 * While Linux can do aliased addresses, it is only useful for their
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57 * legacy ifconfig(8) tool which cannot display >1 IPv4 address
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58 * (it can display many IPv6 addresses which makes the limitation odd).
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59 * Linux has ip(8) which is a more feature rich tool, without the above
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60 * restriction.
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61 */
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62 #ifndef ALIAS_ADDR
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63 # ifdef __sun
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64 # define ALIAS_ADDR
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65 # endif
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66 #endif
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67
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68 #include "config.h"
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69
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70 /* POSIX defines ioctl request as an int, which Solaris and musl use.
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71 * Everyone else use an unsigned long, which happens to be the bigger one
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72 * so we use that in our on wire API. */
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73 #ifdef IOCTL_REQUEST_TYPE
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74 typedef IOCTL_REQUEST_TYPE ioctl_request_t;
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75 #else
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76 typedef unsigned long ioctl_request_t;
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77 #endif
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78
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79 #include "dhcpcd.h"
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80 #include "ipv4.h"
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81 #include "ipv6.h"
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82 #include "route.h"
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83
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84 #define EUI64_ADDR_LEN 8
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85 #define INFINIBAND_ADDR_LEN 20
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86
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87 /* Linux 2.4 doesn't define this */
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88 #ifndef ARPHRD_IEEE1394
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89 # define ARPHRD_IEEE1394 24
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90 #endif
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91
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92 /* The BSD's don't define this yet */
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93 #ifndef ARPHRD_INFINIBAND
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94 # define ARPHRD_INFINIBAND 32
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95 #endif
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96
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97 /* Maximum frame length.
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98 * Support jumbo frames and some extra. */
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99 #define FRAMEHDRLEN_MAX 14 /* only ethernet support */
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100 #define FRAMELEN_MAX (FRAMEHDRLEN_MAX + 9216)
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101
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102 #define UDPLEN_MAX 64 * 1024
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103
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104 /* Work out if we have a private address or not
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105 * 10/8
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106 * 172.16/12
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107 * 192.168/16
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108 */
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109 #ifndef IN_PRIVATE
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110 # define IN_PRIVATE(addr) (((addr & IN_CLASSA_NET) == 0x0a000000) || \
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111 ((addr & 0xfff00000) == 0xac100000) || \
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112 ((addr & IN_CLASSB_NET) == 0xc0a80000))
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113 #endif
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114
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115 #ifndef CLLADDR
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116 #ifdef AF_LINK
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117 # define CLLADDR(sdl) (const void *)((sdl)->sdl_data + (sdl)->sdl_nlen)
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118 #endif
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119 #endif
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120
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121 #ifdef __sun
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122 /* Solaris stupidly defines this for compat with BSD
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123 * but then ignores it. */
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124 #undef RTF_CLONING
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125
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126 /* This interface is busted on DilOS at least.
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127 * It used to work, but lukily Solaris can fall back to
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128 * IP_PKTINFO. */
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129 #undef IP_RECVIF
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130
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131 /* Solaris getifaddrs is very un-suitable for dhcpcd.
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132 * See if-sun.c for details why. */
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133 struct ifaddrs;
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134 int if_getifaddrs(struct ifaddrs **);
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135 #define getifaddrs if_getifaddrs
4692
4a8c51be0604 Solaris: Get the subnet in ipv6 ifa handler
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136 int if_getsubnet(struct dhcpcd_ctx *, const char *, int, void *, size_t);
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137 #endif
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138
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b664b38faf10 ioctl: The POSIX signature differs from BSD and glibc
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139 int if_ioctl(struct dhcpcd_ctx *, ioctl_request_t, void *, size_t);
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140 #ifdef HAVE_PLEDGE
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141 #define pioctl(ctx, req, data, len) if_ioctl((ctx), (req), (data), (len))
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142 #else
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143 #define pioctl(ctx, req, data, len) ioctl((ctx)->pf_inet_fd, (req),(data),(len))
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144 #endif
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145 int if_getflags(struct interface *);
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146 int if_setflag(struct interface *, short, short);
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147 #define if_up(ifp) if_setflag((ifp), (IFF_UP | IFF_RUNNING), 0)
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148 #define if_down(ifp) if_setflag((ifp), 0, IFF_UP);
5499
6a2da5651841 dhcpcd: Simplify the link handling even more
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149 bool if_is_link_up(const struct interface *);
4076
9433864aa014 Hardware Address validation
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150 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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151 struct if_head *if_discover(struct dhcpcd_ctx *, struct ifaddrs **,
0b088d803b61 dhcp6: don't listen on IPv6 addresses when not using DHCP6
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152 int, char * const *);
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27bad70c0d9c link: detect buffer overflow / desync and relearn interface state
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153 void if_markaddrsstale(struct if_head *);
4189
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154 void if_learnaddrs(struct dhcpcd_ctx *, struct if_head *, struct ifaddrs **);
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155 void if_deletestaleaddrs(struct if_head *);
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156 struct interface *if_find(struct if_head *, const char *);
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157 struct interface *if_findindex(struct if_head *, unsigned int);
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158 struct interface *if_loopback(struct dhcpcd_ctx *);
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159 void if_free(struct interface *);
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160 int if_domtu(const struct interface *, short int);
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161 #define if_getmtu(ifp) if_domtu((ifp), 0)
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162 #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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parents: 5475
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163 int if_carrier(struct interface *, const void *);
5557
e65d193a1960 Linux: Support wireless IP roaming
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parents: 5499
diff changeset
164 bool if_roaming(struct interface *);
3932
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165
4439
5ed513825ce5 if: Add a generic function to create an aliased address name
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166 #ifdef ALIAS_ADDR
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167 int if_makealias(char *, size_t, const char *, int);
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168 #endif
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169
4433
4262dbc903e8 sun: Fix carrier detection, MTU detection and plumbing
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170 int if_mtu_os(const struct interface *);
4262dbc903e8 sun: Fix carrier detection, MTU detection and plumbing
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171
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172 /*
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173 * Helper to decode an interface name of bge0:1 to
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174 * devname = bge0, drvname = bge0, ppa = 0, lun = 1.
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175 * If ppa or lun are invalid they are set to -1.
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176 */
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177 struct if_spec {
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178 char ifname[IF_NAMESIZE];
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179 char devname[IF_NAMESIZE];
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180 char drvname[IF_NAMESIZE];
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181 int ppa;
5071
e09697275eda if: Decode vlid from the interface name
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182 int vlid;
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183 int lun;
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184 };
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185 int if_nametospec(const char *, struct if_spec *);
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186
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187 /* The below functions are provided by if-KERNEL.c */
5458
dd8347a0ea1c Adjust prior so that message is logged before starting dev
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188 int os_init(void);
3932
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189 int if_conf(struct interface *);
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190 int if_init(struct interface *);
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191 int if_getssid(struct interface *);
5310
0a6bde63868b privsep: Remove pledges inet and dns from the master process
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parents: 5282
diff changeset
192 int if_ignoregroup(int, const char *);
4748
4cfd9d38741f BSD: Ignore interface groups as we would the interface name
Roy Marples <roy@marples.name>
parents: 4747
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193 bool if_ignore(struct dhcpcd_ctx *, const char *);
5204
47f18579daae privsep: Implement pledge(2) support as found on OpenBSD
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parents: 5153
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194 int if_vimaster(struct dhcpcd_ctx *ctx, const char *);
4052
08038b46c0f5 Detect VLANID to use in IAID.
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195 unsigned short if_vlanid(const struct interface *);
5457
7fb0274b9127 Linux: detect network namespace and deny udev in one
Roy Marples <roy@marples.name>
parents: 5436
diff changeset
196 char * if_getnetworknamespace(char *, size_t);
3932
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197 int if_opensockets(struct dhcpcd_ctx *);
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198 int if_opensockets_os(struct dhcpcd_ctx *);
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199 void if_closesockets(struct dhcpcd_ctx *);
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200 void if_closesockets_os(struct dhcpcd_ctx *);
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201 int if_handlelink(struct dhcpcd_ctx *);
4958
a120f447fe74 Implement Anonymity Profiles for DHCP Clients, RFC 7844
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202 int if_randomisemac(struct interface *);
a120f447fe74 Implement Anonymity Profiles for DHCP Clients, RFC 7844
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diff changeset
203 int if_setmac(struct interface *ifp, void *, uint8_t);
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204
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205 /* dhcpcd uses the same routing flags as BSD.
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206 * If the platform doesn't use these flags,
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207 * map them in the platform interace file. */
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208 #ifndef RTM_ADD
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209 #define RTM_ADD 0x1 /* Add Route */
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210 #define RTM_DELETE 0x2 /* Delete Route */
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211 #define RTM_CHANGE 0x3 /* Change Metrics or flags */
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212 #define RTM_GET 0x4 /* Report Metrics */
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213 #endif
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214
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215 /* Define SOCK_CLOEXEC and SOCK_NONBLOCK for systems that lack it.
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216 * xsocket() in if.c will map them to fctnl FD_CLOEXEC and O_NONBLOCK. */
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217 #ifdef SOCK_CLOEXEC
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218 # define HAVE_SOCK_CLOEXEC
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219 #else
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220 # define SOCK_CLOEXEC 0x10000000
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221 #endif
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222 #ifdef SOCK_NONBLOCK
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223 # define HAVE_SOCK_NONBLOCK
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224 #else
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225 # define SOCK_NONBLOCK 0x20000000
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226 #endif
5231
a2c342295221 privsep: Enable Capsicum for all processes.
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227 #ifndef SOCK_CXNB
a2c342295221 privsep: Enable Capsicum for all processes.
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228 #define SOCK_CXNB SOCK_CLOEXEC | SOCK_NONBLOCK
a2c342295221 privsep: Enable Capsicum for all processes.
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229 #endif
5436
56c934c73aa8 if: introduce xsocketpair, similar to xsocket
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230 int xsocket(int, int, int);
56c934c73aa8 if: introduce xsocketpair, similar to xsocket
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diff changeset
231 int xsocketpair(int, int, int, int[2]);
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232
3983
45f0408b6c28 These functions are AF agnostic now.
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233 int if_route(unsigned char, const struct rt *rt);
4400
2d6a2c8c6b56 route: Remove kroutes and make froutes optional
Roy Marples <roy@marples.name>
parents: 4394
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234 int if_initrt(struct dhcpcd_ctx *, rb_tree_t *, int);
3983
45f0408b6c28 These functions are AF agnostic now.
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235
5057
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 5029
diff changeset
236 int if_missfilter(struct interface *, struct sockaddr *);
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 5029
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237 int if_missfilter_apply(struct dhcpcd_ctx *);
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
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238
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239 #ifdef INET
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240 int if_address(unsigned char, const struct ipv4_addr *);
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241 int if_addrflags(const struct interface *, const struct in_addr *,
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242 const char *);
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243
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244 #endif
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245
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246 #ifdef INET6
4799
95842881a2ef BSD: Disable kernel RTADV sysctl earlier
Roy Marples <roy@marples.name>
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247 void if_disable_rtadv(void);
4218
f618f850efdc inet6: simplify setup of kernel
Roy Marples <roy@marples.name>
parents: 4197
diff changeset
248 void if_setup_inet6(const struct interface *);
4335
d0519e1f2f5f ip6: Implement IPv6 address sharing
Roy Marples <roy@marples.name>
parents: 4333
diff changeset
249 int ip6_forwarding(const char *ifname);
3932
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250
4840
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
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251 struct ra;
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
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diff changeset
252 struct ipv6_addr;
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253
4813
ef33eb73e97d INET6: Apply hoplimit, reachable and retrans timer values from RA.
Roy Marples <roy@marples.name>
parents: 4799
diff changeset
254 int if_applyra(const struct ra *);
3932
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255 int if_address6(unsigned char, const struct ipv6_addr *);
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256 int if_addrflags6(const struct interface *, const struct in6_addr *,
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257 const char *);
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258 int if_getlifetime6(struct ipv6_addr *);
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259
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260 #else
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261 #define if_checkipv6(a, b, c) (-1)
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262 #endif
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263
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264 int if_machinearch(char *, size_t);
4374
d67204739087 Fold all CMSG parsing into a common function.
Roy Marples <roy@marples.name>
parents: 4335
diff changeset
265 struct interface *if_findifpfromcmsg(struct dhcpcd_ctx *,
d67204739087 Fold all CMSG parsing into a common function.
Roy Marples <roy@marples.name>
parents: 4335
diff changeset
266 struct msghdr *, int *);
4840
073fcd86db9b privsep: Add support for priviledge separation
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parents: 4813
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267
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268 #ifdef __linux__
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269 int if_linksocket(struct sockaddr_nl *, int, int);
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270 int if_getnetlink(struct dhcpcd_ctx *, struct iovec *, int, int,
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271 int (*)(struct dhcpcd_ctx *, void *, struct nlmsghdr *), void *);
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272 #endif
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273 #endif