1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2020 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 INTERFACE_H 30 #define INTERFACE_H 31 32 #include <net/if.h> 33 #include <net/route.h> /* for RTM_ADD et all */ 34 #include <netinet/in.h> 35 #ifdef BSD 36 #include <netinet/in_var.h> /* for IN_IFF_TENTATIVE et all */ 37 #endif 38 39 #include <ifaddrs.h> 40 41 /* Some systems have in-built IPv4 DAD. 42 * However, we need them to do DAD at carrier up as well. */ 43 #ifdef IN_IFF_TENTATIVE 44 # ifdef __NetBSD__ 45 # define NOCARRIER_PRESERVE_IP 46 # endif 47 #endif 48 49 /* 50 * Systems which handle 1 address per alias. 51 * Currenly this is just Solaris. 52 * While Linux can do aliased addresses, it is only useful for their 53 * legacy ifconfig(8) tool which cannot display >1 IPv4 address 54 * (it can display many IPv6 addresses which makes the limitation odd). 55 * Linux has ip(8) which is a more feature rich tool, without the above 56 * restriction. 57 */ 58 #ifndef ALIAS_ADDR 59 # ifdef __sun 60 # define ALIAS_ADDR 61 # endif 62 #endif 63 64 #include "config.h" 65 66 /* POSIX defines ioctl request as an int, which Solaris and musl use. 67 * Everyone else use an unsigned long, which happens to be the bigger one 68 * so we use that in our on wire API. */ 69 #ifdef IOCTL_REQUEST_TYPE 70 typedef IOCTL_REQUEST_TYPE ioctl_request_t; 71 #else 72 typedef unsigned long ioctl_request_t; 73 #endif 74 75 #include "dhcpcd.h" 76 #include "ipv4.h" 77 #include "ipv6.h" 78 #include "route.h" 79 80 #define EUI64_ADDR_LEN 8 81 #define INFINIBAND_ADDR_LEN 20 82 83 /* Linux 2.4 doesn't define this */ 84 #ifndef ARPHRD_IEEE1394 85 # define ARPHRD_IEEE1394 24 86 #endif 87 88 /* The BSD's don't define this yet */ 89 #ifndef ARPHRD_INFINIBAND 90 # define ARPHRD_INFINIBAND 32 91 #endif 92 93 /* Maximum frame length. 94 * Support jumbo frames and some extra. */ 95 #define FRAMEHDRLEN_MAX 14 /* only ethernet support */ 96 #define FRAMELEN_MAX (FRAMEHDRLEN_MAX + 9216) 97 98 /* Work out if we have a private address or not 99 * 10/8 100 * 172.16/12 101 * 192.168/16 102 */ 103 #ifndef IN_PRIVATE 104 # define IN_PRIVATE(addr) (((addr & IN_CLASSA_NET) == 0x0a000000) || \ 105 ((addr & 0xfff00000) == 0xac100000) || \ 106 ((addr & IN_CLASSB_NET) == 0xc0a80000)) 107 #endif 108 109 #ifndef CLLADDR 110 #ifdef AF_LINK 111 # define CLLADDR(sdl) (const void *)((sdl)->sdl_data + (sdl)->sdl_nlen) 112 #endif 113 #endif 114 115 #ifdef __sun 116 /* Solaris stupidly defines this for compat with BSD 117 * but then ignores it. */ 118 #undef RTF_CLONING 119 120 /* Solaris getifaddrs is very un-suitable for dhcpcd. 121 * See if-sun.c for details why. */ 122 struct ifaddrs; 123 int if_getifaddrs(struct ifaddrs **); 124 #define getifaddrs if_getifaddrs 125 int if_getsubnet(struct dhcpcd_ctx *, const char *, int, void *, size_t); 126 #endif 127 128 int if_ioctl(struct dhcpcd_ctx *, ioctl_request_t, void *, size_t); 129 int if_getflags(struct interface *); 130 int if_setflag(struct interface *, short, short); 131 #define if_up(ifp) if_setflag((ifp), (IFF_UP | IFF_RUNNING), 0) 132 #define if_down(ifp) if_setflag((ifp), 0, IFF_UP); 133 bool if_valid_hwaddr(const uint8_t *, size_t); 134 struct if_head *if_discover(struct dhcpcd_ctx *, struct ifaddrs **, 135 int, char * const *); 136 void if_markaddrsstale(struct if_head *); 137 void if_learnaddrs(struct dhcpcd_ctx *, struct if_head *, struct ifaddrs **); 138 void if_deletestaleaddrs(struct if_head *); 139 struct interface *if_find(struct if_head *, const char *); 140 struct interface *if_findindex(struct if_head *, unsigned int); 141 struct interface *if_loopback(struct dhcpcd_ctx *); 142 void if_free(struct interface *); 143 int if_domtu(const struct interface *, short int); 144 #define if_getmtu(ifp) if_domtu((ifp), 0) 145 #define if_setmtu(ifp, mtu) if_domtu((ifp), (mtu)) 146 int if_carrier(struct interface *); 147 148 #ifdef ALIAS_ADDR 149 int if_makealias(char *, size_t, const char *, int); 150 #endif 151 152 int if_mtu_os(const struct interface *); 153 154 /* 155 * Helper to decode an interface name of bge0:1 to 156 * devname = bge0, drvname = bge0, ppa = 0, lun = 1. 157 * If ppa or lun are invalid they are set to -1. 158 */ 159 struct if_spec { 160 char ifname[IF_NAMESIZE]; 161 char devname[IF_NAMESIZE]; 162 char drvname[IF_NAMESIZE]; 163 int ppa; 164 int vlid; 165 int lun; 166 }; 167 int if_nametospec(const char *, struct if_spec *); 168 169 /* The below functions are provided by if-KERNEL.c */ 170 int if_conf(struct interface *); 171 int if_init(struct interface *); 172 int if_getssid(struct interface *); 173 bool if_ignore(struct dhcpcd_ctx *, const char *); 174 int if_vimaster(const struct dhcpcd_ctx *ctx, const char *); 175 unsigned short if_vlanid(const struct interface *); 176 int if_opensockets(struct dhcpcd_ctx *); 177 int if_opensockets_os(struct dhcpcd_ctx *); 178 void if_closesockets(struct dhcpcd_ctx *); 179 void if_closesockets_os(struct dhcpcd_ctx *); 180 int if_handlelink(struct dhcpcd_ctx *); 181 int if_randomisemac(struct interface *); 182 int if_setmac(struct interface *ifp, void *, uint8_t); 183 184 /* dhcpcd uses the same routing flags as BSD. 185 * If the platform doesn't use these flags, 186 * map them in the platform interace file. */ 187 #ifndef RTM_ADD 188 #define RTM_ADD 0x1 /* Add Route */ 189 #define RTM_DELETE 0x2 /* Delete Route */ 190 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 191 #define RTM_GET 0x4 /* Report Metrics */ 192 #endif 193 194 /* Define SOCK_CLOEXEC and SOCK_NONBLOCK for systems that lack it. 195 * xsocket() in if.c will map them to fctnl FD_CLOEXEC and O_NONBLOCK. */ 196 #ifdef SOCK_CLOEXEC 197 # define HAVE_SOCK_CLOEXEC 198 #else 199 # define SOCK_CLOEXEC 0x10000000 200 #endif 201 #ifdef SOCK_NONBLOCK 202 # define HAVE_SOCK_NONBLOCK 203 #else 204 # define SOCK_NONBLOCK 0x20000000 205 #endif 206 207 int if_route(unsigned char, const struct rt *rt); 208 int if_initrt(struct dhcpcd_ctx *, rb_tree_t *, int); 209 210 int if_missfilter(struct interface *, struct sockaddr *); 211 int if_missfilter_apply(struct dhcpcd_ctx *); 212 213 #ifdef INET 214 int if_address(unsigned char, const struct ipv4_addr *); 215 int if_addrflags(const struct interface *, const struct in_addr *, 216 const char *); 217 218 #endif 219 220 #ifdef INET6 221 void if_disable_rtadv(void); 222 void if_setup_inet6(const struct interface *); 223 int ip6_forwarding(const char *ifname); 224 225 struct ra; 226 struct ipv6_addr; 227 228 int if_applyra(const struct ra *); 229 int if_address6(unsigned char, const struct ipv6_addr *); 230 int if_addrflags6(const struct interface *, const struct in6_addr *, 231 const char *); 232 int if_getlifetime6(struct ipv6_addr *); 233 234 #else 235 #define if_checkipv6(a, b, c) (-1) 236 #endif 237 238 int if_machinearch(char *, size_t); 239 struct interface *if_findifpfromcmsg(struct dhcpcd_ctx *, 240 struct msghdr *, int *); 241 int xsocket(int, int, int); 242 243 #ifdef __linux__ 244 int if_linksocket(struct sockaddr_nl *, int); 245 int if_getnetlink(struct dhcpcd_ctx *, struct iovec *, int, int, 246 int (*)(struct dhcpcd_ctx *, void *, struct nlmsghdr *), void *); 247 #endif 248 #endif 249