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 /* If the interface does not support carrier status (ie PPP), 42 * dhcpcd can poll it for the relevant flags periodically */ 43 #define IF_POLL_UP 100 /* milliseconds */ 44 45 /* Some systems have in-built IPv4 DAD. 46 * However, we need them to do DAD at carrier up as well. */ 47 #ifdef IN_IFF_TENTATIVE 48 # ifdef __NetBSD__ 49 # define NOCARRIER_PRESERVE_IP 50 # endif 51 #endif 52 53 /* 54 * Systems which handle 1 address per alias. 55 * Currenly this is just Solaris. 56 * While Linux can do aliased addresses, it is only useful for their 57 * legacy ifconfig(8) tool which cannot display >1 IPv4 address 58 * (it can display many IPv6 addresses which makes the limitation odd). 59 * Linux has ip(8) which is a more feature rich tool, without the above 60 * restriction. 61 */ 62 #ifndef ALIAS_ADDR 63 # ifdef __sun 64 # define ALIAS_ADDR 65 # endif 66 #endif 67 68 #include "config.h" 69 70 /* POSIX defines ioctl request as an int, which Solaris and musl use. 71 * Everyone else use an unsigned long, which happens to be the bigger one 72 * so we use that in our on wire API. */ 73 #ifdef IOCTL_REQUEST_TYPE 74 typedef IOCTL_REQUEST_TYPE ioctl_request_t; 75 #else 76 typedef unsigned long ioctl_request_t; 77 #endif 78 79 #include "dhcpcd.h" 80 #include "ipv4.h" 81 #include "ipv6.h" 82 #include "route.h" 83 84 #define EUI64_ADDR_LEN 8 85 #define INFINIBAND_ADDR_LEN 20 86 87 /* Linux 2.4 doesn't define this */ 88 #ifndef ARPHRD_IEEE1394 89 # define ARPHRD_IEEE1394 24 90 #endif 91 92 /* The BSD's don't define this yet */ 93 #ifndef ARPHRD_INFINIBAND 94 # define ARPHRD_INFINIBAND 32 95 #endif 96 97 /* Maximum frame length. 98 * Support jumbo frames and some extra. */ 99 #define FRAMEHDRLEN_MAX 14 /* only ethernet support */ 100 #define FRAMELEN_MAX (FRAMEHDRLEN_MAX + 9216) 101 102 #define UDPLEN_MAX 64 * 1024 103 104 /* Work out if we have a private address or not 105 * 10/8 106 * 172.16/12 107 * 192.168/16 108 */ 109 #ifndef IN_PRIVATE 110 # define IN_PRIVATE(addr) (((addr & IN_CLASSA_NET) == 0x0a000000) || \ 111 ((addr & 0xfff00000) == 0xac100000) || \ 112 ((addr & IN_CLASSB_NET) == 0xc0a80000)) 113 #endif 114 115 #ifndef CLLADDR 116 #ifdef AF_LINK 117 # define CLLADDR(sdl) (const void *)((sdl)->sdl_data + (sdl)->sdl_nlen) 118 #endif 119 #endif 120 121 #ifdef __sun 122 /* Solaris stupidly defines this for compat with BSD 123 * but then ignores it. */ 124 #undef RTF_CLONING 125 126 /* This interface is busted on DilOS at least. 127 * It used to work, but lukily Solaris can fall back to 128 * IP_PKTINFO. */ 129 #undef IP_RECVIF 130 131 /* Solaris getifaddrs is very un-suitable for dhcpcd. 132 * See if-sun.c for details why. */ 133 struct ifaddrs; 134 int if_getifaddrs(struct ifaddrs **); 135 #define getifaddrs if_getifaddrs 136 int if_getsubnet(struct dhcpcd_ctx *, const char *, int, void *, size_t); 137 #endif 138 139 int if_ioctl(struct dhcpcd_ctx *, ioctl_request_t, void *, size_t); 140 #ifdef HAVE_PLEDGE 141 #define pioctl(ctx, req, data, len) if_ioctl((ctx), (req), (data), (len)) 142 #else 143 #define pioctl(ctx, req, data, len) ioctl((ctx)->pf_inet_fd, (req),(data),(len)) 144 #endif 145 int if_getflags(struct interface *); 146 int if_setflag(struct interface *, short, short); 147 #define if_up(ifp) if_setflag((ifp), (IFF_UP | IFF_RUNNING), 0) 148 #define if_down(ifp) if_setflag((ifp), 0, IFF_UP); 149 bool if_valid_hwaddr(const uint8_t *, size_t); 150 struct if_head *if_discover(struct dhcpcd_ctx *, struct ifaddrs **, 151 int, char * const *); 152 void if_markaddrsstale(struct if_head *); 153 void if_learnaddrs(struct dhcpcd_ctx *, struct if_head *, struct ifaddrs **); 154 void if_deletestaleaddrs(struct if_head *); 155 struct interface *if_find(struct if_head *, const char *); 156 struct interface *if_findindex(struct if_head *, unsigned int); 157 struct interface *if_loopback(struct dhcpcd_ctx *); 158 void if_free(struct interface *); 159 int if_domtu(const struct interface *, short int); 160 #define if_getmtu(ifp) if_domtu((ifp), 0) 161 #define if_setmtu(ifp, mtu) if_domtu((ifp), (mtu)) 162 int if_carrier(struct interface *, const void *); 163 164 #ifdef ALIAS_ADDR 165 int if_makealias(char *, size_t, const char *, int); 166 #endif 167 168 int if_mtu_os(const struct interface *); 169 170 /* 171 * Helper to decode an interface name of bge0:1 to 172 * devname = bge0, drvname = bge0, ppa = 0, lun = 1. 173 * If ppa or lun are invalid they are set to -1. 174 */ 175 struct if_spec { 176 char ifname[IF_NAMESIZE]; 177 char devname[IF_NAMESIZE]; 178 char drvname[IF_NAMESIZE]; 179 int ppa; 180 int vlid; 181 int lun; 182 }; 183 int if_nametospec(const char *, struct if_spec *); 184 185 /* The below functions are provided by if-KERNEL.c */ 186 int os_init(void); 187 int if_conf(struct interface *); 188 int if_init(struct interface *); 189 int if_getssid(struct interface *); 190 int if_ignoregroup(int, const char *); 191 bool if_ignore(struct dhcpcd_ctx *, const char *); 192 int if_vimaster(struct dhcpcd_ctx *ctx, const char *); 193 unsigned short if_vlanid(const struct interface *); 194 char * if_getnetworknamespace(char *, size_t); 195 int if_opensockets(struct dhcpcd_ctx *); 196 int if_opensockets_os(struct dhcpcd_ctx *); 197 void if_closesockets(struct dhcpcd_ctx *); 198 void if_closesockets_os(struct dhcpcd_ctx *); 199 int if_handlelink(struct dhcpcd_ctx *); 200 int if_randomisemac(struct interface *); 201 int if_setmac(struct interface *ifp, void *, uint8_t); 202 203 /* dhcpcd uses the same routing flags as BSD. 204 * If the platform doesn't use these flags, 205 * map them in the platform interace file. */ 206 #ifndef RTM_ADD 207 #define RTM_ADD 0x1 /* Add Route */ 208 #define RTM_DELETE 0x2 /* Delete Route */ 209 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 210 #define RTM_GET 0x4 /* Report Metrics */ 211 #endif 212 213 /* Define SOCK_CLOEXEC and SOCK_NONBLOCK for systems that lack it. 214 * xsocket() in if.c will map them to fctnl FD_CLOEXEC and O_NONBLOCK. */ 215 #ifdef SOCK_CLOEXEC 216 # define HAVE_SOCK_CLOEXEC 217 #else 218 # define SOCK_CLOEXEC 0x10000000 219 #endif 220 #ifdef SOCK_NONBLOCK 221 # define HAVE_SOCK_NONBLOCK 222 #else 223 # define SOCK_NONBLOCK 0x20000000 224 #endif 225 #ifndef SOCK_CXNB 226 #define SOCK_CXNB SOCK_CLOEXEC | SOCK_NONBLOCK 227 #endif 228 int xsocket(int, int, int); 229 int xsocketpair(int, int, int, int[2]); 230 231 int if_route(unsigned char, const struct rt *rt); 232 int if_initrt(struct dhcpcd_ctx *, rb_tree_t *, int); 233 234 int if_missfilter(struct interface *, struct sockaddr *); 235 int if_missfilter_apply(struct dhcpcd_ctx *); 236 237 #ifdef INET 238 int if_address(unsigned char, const struct ipv4_addr *); 239 int if_addrflags(const struct interface *, const struct in_addr *, 240 const char *); 241 242 #endif 243 244 #ifdef INET6 245 void if_disable_rtadv(void); 246 void if_setup_inet6(const struct interface *); 247 int ip6_forwarding(const char *ifname); 248 249 struct ra; 250 struct ipv6_addr; 251 252 int if_applyra(const struct ra *); 253 int if_address6(unsigned char, const struct ipv6_addr *); 254 int if_addrflags6(const struct interface *, const struct in6_addr *, 255 const char *); 256 int if_getlifetime6(struct ipv6_addr *); 257 258 #else 259 #define if_checkipv6(a, b, c) (-1) 260 #endif 261 262 int if_machinearch(char *, size_t); 263 struct interface *if_findifpfromcmsg(struct dhcpcd_ctx *, 264 struct msghdr *, int *); 265 266 #ifdef __linux__ 267 int if_linksocket(struct sockaddr_nl *, int, int); 268 int if_getnetlink(struct dhcpcd_ctx *, struct iovec *, int, int, 269 int (*)(struct dhcpcd_ctx *, void *, struct nlmsghdr *), void *); 270 #endif 271 #endif 272