Pau Espin Pedrol | fdd732b | 2017-10-13 14:32:24 +0200 | [diff] [blame] | 1 | /* |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 2 | * TUN interface functions. |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 3 | * Copyright (C) 2002, 2003, 2004 Mondru AB. |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 4 | * Copyright (C) 2017 by Harald Welte <laforge@gnumonks.org> |
Pau Espin Pedrol | fdd732b | 2017-10-13 14:32:24 +0200 | [diff] [blame] | 5 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 6 | * The contents of this file may be used under the terms of the GNU |
| 7 | * General Public License Version 2, provided that the above copyright |
| 8 | * notice and this permission notice is included in all copies or |
| 9 | * substantial portions of the software. |
Pau Espin Pedrol | fdd732b | 2017-10-13 14:32:24 +0200 | [diff] [blame] | 10 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | /* |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 14 | * tun.c: Contains all TUN functionality. Is able to handle multiple |
| 15 | * tunnels in the same program. Each tunnel is identified by the struct, |
| 16 | * which is passed to functions. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 17 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 18 | */ |
| 19 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <netinet/in.h> |
| 25 | #include <arpa/inet.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <sys/time.h> |
| 28 | #include <unistd.h> |
| 29 | #include <string.h> |
| 30 | #include <errno.h> |
| 31 | #include <fcntl.h> |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <fcntl.h> |
| 35 | #include <unistd.h> |
| 36 | #include <sys/time.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 37 | #include <sys/ioctl.h> |
| 38 | #include <sys/socket.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 39 | #include <errno.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 40 | #include <net/route.h> |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 41 | #include <net/if.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 42 | |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 43 | #if defined(__linux__) |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 44 | #include <linux/if_tun.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 45 | #include <linux/netlink.h> |
| 46 | #include <linux/rtnetlink.h> |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 47 | |
| 48 | #elif defined (__FreeBSD__) |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 49 | #include <net/if_tun.h> |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 50 | #include <net/if_var.h> |
| 51 | #include <netinet/in_var.h> |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 52 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 53 | #elif defined (__APPLE__) |
| 54 | #include <net/if.h> |
| 55 | |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 56 | #else |
| 57 | #error "Unknown platform!" |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 58 | #endif |
| 59 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 60 | #include "tun.h" |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 61 | #include "syserr.h" |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 62 | |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 63 | #if defined(__linux__) |
| 64 | |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 65 | #include <linux/ipv6.h> |
| 66 | |
Harald Welte | 2778ae2 | 2017-08-12 16:38:44 +0200 | [diff] [blame] | 67 | static int tun_nlattr(struct nlmsghdr *n, int nsize, int type, void *d, int dlen) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 68 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 69 | int len = RTA_LENGTH(dlen); |
| 70 | int alen = NLMSG_ALIGN(n->nlmsg_len); |
| 71 | struct rtattr *rta = (struct rtattr *)(((void *)n) + alen); |
| 72 | if (alen + len > nsize) |
| 73 | return -1; |
| 74 | rta->rta_len = len; |
| 75 | rta->rta_type = type; |
| 76 | memcpy(RTA_DATA(rta), d, dlen); |
| 77 | n->nlmsg_len = alen + len; |
| 78 | return 0; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 79 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 80 | #endif |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 81 | |
Harald Welte | 2778ae2 | 2017-08-12 16:38:44 +0200 | [diff] [blame] | 82 | static int tun_sifflags(struct tun_t *this, int flags) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 83 | { |
| 84 | struct ifreq ifr; |
| 85 | int fd; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 86 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 87 | memset(&ifr, '\0', sizeof(ifr)); |
| 88 | ifr.ifr_flags = flags; |
| 89 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 90 | ifr.ifr_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ |
| 91 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 92 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
Michael McTernan | b07d070 | 2015-05-02 07:52:23 +0200 | [diff] [blame] | 93 | return -1; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 94 | } |
| 95 | if (ioctl(fd, SIOCSIFFLAGS, &ifr)) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 96 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 97 | "ioctl(SIOCSIFFLAGS) failed"); |
| 98 | close(fd); |
| 99 | return -1; |
| 100 | } |
| 101 | close(fd); |
| 102 | return 0; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 103 | } |
| 104 | |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 105 | static int tun_setaddr4(struct tun_t *this, struct in_addr *addr, |
| 106 | struct in_addr *dstaddr, struct in_addr *netmask) |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 107 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 108 | struct ifreq ifr; |
| 109 | int fd; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 110 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 111 | memset(&ifr, '\0', sizeof(ifr)); |
| 112 | ifr.ifr_addr.sa_family = AF_INET; |
| 113 | ifr.ifr_dstaddr.sa_family = AF_INET; |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 114 | |
| 115 | #if defined(__linux__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 116 | ifr.ifr_netmask.sa_family = AF_INET; |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 117 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 118 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 119 | ((struct sockaddr_in *)&ifr.ifr_addr)->sin_len = |
| 120 | sizeof(struct sockaddr_in); |
| 121 | ((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_len = |
| 122 | sizeof(struct sockaddr_in); |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 123 | #endif |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 124 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 125 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 126 | ifr.ifr_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 127 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 128 | /* Create a channel to the NET kernel. */ |
| 129 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 130 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 131 | return -1; |
| 132 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 133 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 134 | if (addr) { /* Set the interface address */ |
| 135 | this->addr.s_addr = addr->s_addr; |
| 136 | memcpy(&((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr, addr, |
| 137 | sizeof(*addr)); |
| 138 | if (ioctl(fd, SIOCSIFADDR, (void *)&ifr) < 0) { |
| 139 | if (errno != EEXIST) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 140 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 141 | "ioctl(SIOCSIFADDR) failed"); |
| 142 | } else { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 143 | SYS_ERR(DTUN, LOGL_NOTICE, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 144 | "ioctl(SIOCSIFADDR): Address already exists"); |
| 145 | } |
| 146 | close(fd); |
| 147 | return -1; |
| 148 | } |
| 149 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 150 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 151 | if (dstaddr) { /* Set the destination address */ |
| 152 | this->dstaddr.s_addr = dstaddr->s_addr; |
| 153 | memcpy(&((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_addr, |
| 154 | dstaddr, sizeof(*dstaddr)); |
| 155 | if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t) & ifr) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 156 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 157 | "ioctl(SIOCSIFDSTADDR) failed"); |
| 158 | close(fd); |
| 159 | return -1; |
| 160 | } |
| 161 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 162 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 163 | if (netmask) { /* Set the netmask */ |
| 164 | this->netmask.s_addr = netmask->s_addr; |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 165 | #if defined(__linux__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 166 | memcpy(&((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr, |
| 167 | netmask, sizeof(*netmask)); |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 168 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 169 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 170 | ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr = |
| 171 | netmask->s_addr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 172 | #endif |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 173 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 174 | if (ioctl(fd, SIOCSIFNETMASK, (void *)&ifr) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 175 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 176 | "ioctl(SIOCSIFNETMASK) failed"); |
| 177 | close(fd); |
| 178 | return -1; |
| 179 | } |
| 180 | } |
jjako | 1ea6634 | 2004-01-28 09:27:34 +0000 | [diff] [blame] | 181 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 182 | close(fd); |
| 183 | this->addrs++; |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 184 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 185 | /* On linux the route to the interface is set automatically |
| 186 | on FreeBSD we have to do this manually */ |
| 187 | |
| 188 | /* TODO: How does it work on Solaris? */ |
| 189 | |
| 190 | tun_sifflags(this, IFF_UP | IFF_RUNNING); |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 191 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 192 | #if defined(__FreeBSD__) || defined (__APPLE__) |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 193 | tun_addroute(this, dstaddr, addr, &this->netmask); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 194 | this->routes = 1; |
jjako | 1ea6634 | 2004-01-28 09:27:34 +0000 | [diff] [blame] | 195 | #endif |
| 196 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 197 | return 0; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 198 | } |
| 199 | |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 200 | static int tun_setaddr6(struct tun_t *this, struct in6_addr *addr, struct in6_addr *dstaddr, |
| 201 | size_t prefixlen) |
| 202 | { |
| 203 | struct in6_ifreq ifr; |
| 204 | int fd; |
| 205 | |
| 206 | memset(&ifr, 0, sizeof(ifr)); |
| 207 | |
| 208 | #if defined(__linux__) |
| 209 | ifr.ifr6_prefixlen = prefixlen; |
| 210 | ifr.ifr6_ifindex = if_nametoindex(this->devname); |
| 211 | if (ifr.ifr6_ifindex == 0) { |
| 212 | SYS_ERR(DTUN, LOGL_ERROR, 0, "Error getting ifindex for %s\n", this->devname); |
| 213 | return -1; |
| 214 | } |
| 215 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
| 216 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 217 | #endif |
| 218 | |
| 219 | /* Create a channel to the NET kernel */ |
| 220 | if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { |
| 221 | SYS_ERR(DTUN, LOGL_ERROR, 0, "socket() failed"); |
| 222 | return -1; |
| 223 | } |
| 224 | |
| 225 | #if defined(__linux__) |
| 226 | if (addr) { |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 227 | memcpy(&ifr.ifr6_addr, addr, sizeof(*addr)); |
| 228 | if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) { |
| 229 | if (errno != EEXIST) { |
| 230 | SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR) failed"); |
| 231 | } else { |
Pau Espin Pedrol | d9fff0c | 2017-12-01 15:39:28 +0100 | [diff] [blame] | 232 | SYS_ERR(DTUN, LOGL_NOTICE, 0, "ioctl(SIOCSIFADDR): Address already exists"); |
Harald Welte | 2e48a44 | 2017-08-03 00:47:03 +0200 | [diff] [blame] | 233 | } |
| 234 | close(fd); |
| 235 | return -1; |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | #if 0 |
| 240 | /* FIXME: looks like this is not possible/necessary for IPv6? */ |
| 241 | if (dstaddr) { |
| 242 | memcpy(&this->dstaddr, dstaddr, sizeof(*dstaddr)); |
| 243 | memcpy(&ifr.ifr6_addr, dstaddr, sizeof(*dstaddr)); |
| 244 | if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t *) &ifr) < 0) { |
| 245 | SYS_ERR(DTUN, LOGL_ERROR, "ioctl(SIOCSIFDSTADDR) failed"); |
| 246 | close(fd); |
| 247 | return -1; |
| 248 | } |
| 249 | } |
| 250 | #endif |
| 251 | |
| 252 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
| 253 | if (addr) |
| 254 | memcpy(&ifr.ifr_ifru.ifru_addr, addr, sizeof(ifr.ifr_ifru.ifru_addr)); |
| 255 | if (dstaddr) |
| 256 | memcpy(&ifr.ifr_ifru.ifru_dstaddr, dstaddr, sizeof(ifr.ifr_ifru.ifru_dstaddr)); |
| 257 | |
| 258 | if (ioctl(fd, SIOCSIFADDR_IN6, (struct ifreq *)&ifr) < 0) { |
| 259 | SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR_IN6) failed"); |
| 260 | close(fd); |
| 261 | return -1; |
| 262 | } |
| 263 | #endif |
| 264 | |
| 265 | close(fd); |
| 266 | this->addrs++; |
| 267 | |
| 268 | /* On linux the route to the interface is set automatically |
| 269 | on FreeBSD we have to do this manually */ |
| 270 | |
| 271 | /* TODO: How does it work on Solaris? */ |
| 272 | |
| 273 | tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 274 | |
| 275 | #if 0 /* FIXME */ |
| 276 | //#if defined(__FreeBSD__) || defined (__APPLE__) |
| 277 | tun_addroute6(this, dstaddr, addr, prefixlen); |
| 278 | this->routes = 1; |
| 279 | #endif |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | int tun_setaddr(struct tun_t *this, struct in46_addr *addr, struct in46_addr *dstaddr, size_t prefixlen) |
| 285 | { |
| 286 | struct in_addr netmask; |
| 287 | switch (addr->len) { |
| 288 | case 4: |
| 289 | netmask.s_addr = htonl(0xffffffff << (32 - prefixlen)); |
| 290 | return tun_setaddr4(this, &addr->v4, dstaddr ? &dstaddr->v4 : NULL, &netmask); |
| 291 | case 16: |
| 292 | return tun_setaddr6(this, &addr->v6, dstaddr ? &dstaddr->v6 : NULL, prefixlen); |
| 293 | default: |
| 294 | return -1; |
| 295 | } |
| 296 | } |
| 297 | |
Pau Espin Pedrol | b9ace14 | 2017-12-01 14:45:31 +0100 | [diff] [blame] | 298 | int tun_addaddr(struct tun_t *this, |
| 299 | struct in_addr *addr, |
| 300 | struct in_addr *dstaddr, struct in_addr *netmask) |
| 301 | { |
| 302 | |
| 303 | #if defined(__linux__) |
| 304 | struct { |
| 305 | struct nlmsghdr n; |
| 306 | struct ifaddrmsg i; |
| 307 | char buf[TUN_NLBUFSIZE]; |
| 308 | } req; |
| 309 | |
| 310 | struct sockaddr_nl local; |
| 311 | socklen_t addr_len; |
| 312 | int fd; |
| 313 | int status; |
| 314 | |
| 315 | struct sockaddr_nl nladdr; |
| 316 | struct iovec iov; |
| 317 | struct msghdr msg; |
| 318 | |
| 319 | if (!this->addrs) /* Use ioctl for first addr to make ping work */ |
| 320 | return tun_setaddr4(this, addr, dstaddr, netmask); |
| 321 | |
| 322 | memset(&req, 0, sizeof(req)); |
| 323 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 324 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 325 | req.n.nlmsg_type = RTM_NEWADDR; |
| 326 | req.i.ifa_family = AF_INET; |
| 327 | req.i.ifa_prefixlen = 32; /* 32 FOR IPv4 */ |
| 328 | req.i.ifa_flags = 0; |
| 329 | req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */ |
| 330 | req.i.ifa_index = if_nametoindex(this->devname); |
| 331 | if (!req.i.ifa_index) { |
| 332 | SYS_ERR(DTUN, LOGL_ERROR, errno, "Unable to get ifindex for %s", this->devname); |
| 333 | return -1; |
| 334 | } |
| 335 | |
Pau Espin Pedrol | 02e21af | 2017-12-14 13:48:12 +0100 | [diff] [blame^] | 336 | tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(*addr)); |
| 337 | if (dstaddr) |
| 338 | tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(*dstaddr)); |
Pau Espin Pedrol | b9ace14 | 2017-12-01 14:45:31 +0100 | [diff] [blame] | 339 | |
| 340 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 341 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
| 342 | return -1; |
| 343 | } |
| 344 | |
| 345 | memset(&local, 0, sizeof(local)); |
| 346 | local.nl_family = AF_NETLINK; |
| 347 | local.nl_groups = 0; |
| 348 | |
| 349 | if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0) { |
| 350 | SYS_ERR(DTUN, LOGL_ERROR, errno, "bind() failed"); |
| 351 | close(fd); |
| 352 | return -1; |
| 353 | } |
| 354 | |
| 355 | addr_len = sizeof(local); |
| 356 | if (getsockname(fd, (struct sockaddr *)&local, &addr_len) < 0) { |
| 357 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
| 358 | "getsockname() failed"); |
| 359 | close(fd); |
| 360 | return -1; |
| 361 | } |
| 362 | |
| 363 | if (addr_len != sizeof(local)) { |
| 364 | SYS_ERR(DTUN, LOGL_ERROR, 0, |
| 365 | "Wrong address length %d", addr_len); |
| 366 | close(fd); |
| 367 | return -1; |
| 368 | } |
| 369 | |
| 370 | if (local.nl_family != AF_NETLINK) { |
| 371 | SYS_ERR(DTUN, LOGL_ERROR, 0, |
| 372 | "Wrong address family %d", local.nl_family); |
| 373 | close(fd); |
| 374 | return -1; |
| 375 | } |
| 376 | |
| 377 | iov.iov_base = (void *)&req.n; |
| 378 | iov.iov_len = req.n.nlmsg_len; |
| 379 | |
| 380 | msg.msg_name = (void *)&nladdr; |
| 381 | msg.msg_namelen = sizeof(nladdr); |
| 382 | msg.msg_iov = &iov; |
| 383 | msg.msg_iovlen = 1; |
| 384 | msg.msg_control = NULL; |
| 385 | msg.msg_controllen = 0; |
| 386 | msg.msg_flags = 0; |
| 387 | |
| 388 | memset(&nladdr, 0, sizeof(nladdr)); |
| 389 | nladdr.nl_family = AF_NETLINK; |
| 390 | nladdr.nl_pid = 0; |
| 391 | nladdr.nl_groups = 0; |
| 392 | |
| 393 | req.n.nlmsg_seq = 0; |
| 394 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 395 | |
| 396 | status = sendmsg(fd, &msg, 0); |
| 397 | if (status != req.n.nlmsg_len) { |
| 398 | SYS_ERR(DTUN, LOGL_ERROR, errno, "sendmsg() failed, returned %d", status); |
| 399 | close(fd); |
| 400 | return -1; |
| 401 | } |
| 402 | |
| 403 | status = tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 404 | if (status == -1) { |
| 405 | close(fd); |
| 406 | return -1; |
| 407 | } |
| 408 | |
| 409 | |
| 410 | close(fd); |
| 411 | this->addrs++; |
| 412 | return 0; |
| 413 | |
| 414 | #elif defined (__FreeBSD__) || defined (__APPLE__) |
| 415 | |
| 416 | int fd; |
| 417 | struct ifaliasreq areq; |
| 418 | |
| 419 | /* TODO: Is this needed on FreeBSD? */ |
| 420 | if (!this->addrs) /* Use ioctl for first addr to make ping work */ |
| 421 | return tun_setaddr4(this, addr, dstaddr, netmask); /* TODO dstaddr */ |
| 422 | |
| 423 | memset(&areq, 0, sizeof(areq)); |
| 424 | |
| 425 | /* Set up interface name */ |
| 426 | strncpy(areq.ifra_name, this->devname, IFNAMSIZ); |
| 427 | areq.ifra_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ |
| 428 | |
| 429 | ((struct sockaddr_in *)&areq.ifra_addr)->sin_family = AF_INET; |
| 430 | ((struct sockaddr_in *)&areq.ifra_addr)->sin_len = |
| 431 | sizeof(areq.ifra_addr); |
| 432 | ((struct sockaddr_in *)&areq.ifra_addr)->sin_addr.s_addr = addr->s_addr; |
| 433 | |
| 434 | ((struct sockaddr_in *)&areq.ifra_mask)->sin_family = AF_INET; |
| 435 | ((struct sockaddr_in *)&areq.ifra_mask)->sin_len = |
| 436 | sizeof(areq.ifra_mask); |
| 437 | ((struct sockaddr_in *)&areq.ifra_mask)->sin_addr.s_addr = |
| 438 | netmask->s_addr; |
| 439 | |
| 440 | /* For some reason FreeBSD uses ifra_broadcast for specifying dstaddr */ |
| 441 | ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_family = AF_INET; |
| 442 | ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_len = |
| 443 | sizeof(areq.ifra_broadaddr); |
| 444 | ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_addr.s_addr = |
| 445 | dstaddr->s_addr; |
| 446 | |
| 447 | /* Create a channel to the NET kernel. */ |
| 448 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 449 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
| 450 | return -1; |
| 451 | } |
| 452 | |
| 453 | if (ioctl(fd, SIOCAIFADDR, (void *)&areq) < 0) { |
| 454 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
| 455 | "ioctl(SIOCAIFADDR) failed"); |
| 456 | close(fd); |
| 457 | return -1; |
| 458 | } |
| 459 | |
| 460 | close(fd); |
| 461 | this->addrs++; |
| 462 | return 0; |
| 463 | |
| 464 | #endif |
| 465 | |
| 466 | } |
| 467 | |
Harald Welte | 2778ae2 | 2017-08-12 16:38:44 +0200 | [diff] [blame] | 468 | static int tun_route(struct tun_t *this, |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 469 | struct in_addr *dst, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 470 | struct in_addr *gateway, struct in_addr *mask, int delete) |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 471 | { |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 472 | |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 473 | #if defined(__linux__) |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 474 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 475 | struct rtentry r; |
| 476 | int fd; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 477 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 478 | memset(&r, '\0', sizeof(r)); |
| 479 | r.rt_flags = RTF_UP | RTF_GATEWAY; /* RTF_HOST not set */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 480 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 481 | /* Create a channel to the NET kernel. */ |
| 482 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 483 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 484 | return -1; |
| 485 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 486 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 487 | r.rt_dst.sa_family = AF_INET; |
| 488 | r.rt_gateway.sa_family = AF_INET; |
| 489 | r.rt_genmask.sa_family = AF_INET; |
| 490 | memcpy(&((struct sockaddr_in *)&r.rt_dst)->sin_addr, dst, sizeof(*dst)); |
| 491 | memcpy(&((struct sockaddr_in *)&r.rt_gateway)->sin_addr, gateway, |
| 492 | sizeof(*gateway)); |
| 493 | memcpy(&((struct sockaddr_in *)&r.rt_genmask)->sin_addr, mask, |
| 494 | sizeof(*mask)); |
| 495 | |
| 496 | if (delete) { |
| 497 | if (ioctl(fd, SIOCDELRT, (void *)&r) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 498 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 499 | "ioctl(SIOCDELRT) failed"); |
| 500 | close(fd); |
| 501 | return -1; |
| 502 | } |
| 503 | } else { |
| 504 | if (ioctl(fd, SIOCADDRT, (void *)&r) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 505 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 506 | "ioctl(SIOCADDRT) failed"); |
| 507 | close(fd); |
| 508 | return -1; |
| 509 | } |
| 510 | } |
| 511 | close(fd); |
| 512 | return 0; |
| 513 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 514 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
jjako | 3eaf453 | 2004-01-27 19:47:49 +0000 | [diff] [blame] | 515 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 516 | struct { |
| 517 | struct rt_msghdr rt; |
| 518 | struct sockaddr_in dst; |
| 519 | struct sockaddr_in gate; |
| 520 | struct sockaddr_in mask; |
| 521 | } req; |
jjako | 3eaf453 | 2004-01-27 19:47:49 +0000 | [diff] [blame] | 522 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 523 | int fd; |
| 524 | struct rt_msghdr *rtm; |
jjako | 1ea6634 | 2004-01-28 09:27:34 +0000 | [diff] [blame] | 525 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 526 | if ((fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 527 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 528 | return -1; |
| 529 | } |
| 530 | |
| 531 | memset(&req, 0x00, sizeof(req)); |
| 532 | |
| 533 | rtm = &req.rt; |
| 534 | |
| 535 | rtm->rtm_msglen = sizeof(req); |
| 536 | rtm->rtm_version = RTM_VERSION; |
| 537 | if (delete) { |
| 538 | rtm->rtm_type = RTM_DELETE; |
| 539 | } else { |
| 540 | rtm->rtm_type = RTM_ADD; |
| 541 | } |
| 542 | rtm->rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; /* TODO */ |
| 543 | rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; |
| 544 | rtm->rtm_pid = getpid(); |
| 545 | rtm->rtm_seq = 0044; /* TODO */ |
| 546 | |
| 547 | req.dst.sin_family = AF_INET; |
| 548 | req.dst.sin_len = sizeof(req.dst); |
| 549 | req.mask.sin_family = AF_INET; |
| 550 | req.mask.sin_len = sizeof(req.mask); |
| 551 | req.gate.sin_family = AF_INET; |
| 552 | req.gate.sin_len = sizeof(req.gate); |
| 553 | |
| 554 | req.dst.sin_addr.s_addr = dst->s_addr; |
| 555 | req.mask.sin_addr.s_addr = mask->s_addr; |
| 556 | req.gate.sin_addr.s_addr = gateway->s_addr; |
| 557 | |
| 558 | if (write(fd, rtm, rtm->rtm_msglen) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 559 | SYS_ERR(DTUN, LOGL_ERROR, errno, "write() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 560 | close(fd); |
| 561 | return -1; |
| 562 | } |
| 563 | close(fd); |
| 564 | return 0; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 565 | #endif |
| 566 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 567 | } |
| 568 | |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 569 | int tun_addroute(struct tun_t *this, |
| 570 | struct in_addr *dst, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 571 | struct in_addr *gateway, struct in_addr *mask) |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 572 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 573 | return tun_route(this, dst, gateway, mask, 0); |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | int tun_delroute(struct tun_t *this, |
| 577 | struct in_addr *dst, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 578 | struct in_addr *gateway, struct in_addr *mask) |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 579 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 580 | return tun_route(this, dst, gateway, mask, 1); |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 581 | } |
| 582 | |
Harald Welte | dda21ed | 2017-08-12 15:07:02 +0200 | [diff] [blame] | 583 | int tun_new(struct tun_t **tun, const char *dev_name) |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 584 | { |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 585 | |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 586 | #if defined(__linux__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 587 | struct ifreq ifr; |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 588 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 589 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 590 | char devname[IFNAMSIZ + 5]; /* "/dev/" + ifname */ |
| 591 | int devnum; |
| 592 | struct ifaliasreq areq; |
| 593 | int fd; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 594 | #endif |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 595 | |
| 596 | if (!(*tun = calloc(1, sizeof(struct tun_t)))) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 597 | SYS_ERR(DTUN, LOGL_ERROR, errno, "calloc() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 598 | return EOF; |
| 599 | } |
| 600 | |
| 601 | (*tun)->cb_ind = NULL; |
| 602 | (*tun)->addrs = 0; |
| 603 | (*tun)->routes = 0; |
| 604 | |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 605 | #if defined(__linux__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 606 | /* Open the actual tun device */ |
| 607 | if (((*tun)->fd = open("/dev/net/tun", O_RDWR)) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 608 | SYS_ERR(DTUN, LOGL_ERROR, errno, "open() failed"); |
Harald Welte | 9e6dfa0 | 2017-08-12 15:06:19 +0200 | [diff] [blame] | 609 | goto err_free; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | /* Set device flags. For some weird reason this is also the method |
| 613 | used to obtain the network interface name */ |
| 614 | memset(&ifr, 0, sizeof(ifr)); |
Harald Welte | dda21ed | 2017-08-12 15:07:02 +0200 | [diff] [blame] | 615 | if (dev_name) |
| 616 | strcpy(ifr.ifr_name, dev_name); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 617 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Tun device, no packet info */ |
| 618 | if (ioctl((*tun)->fd, TUNSETIFF, (void *)&ifr) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 619 | SYS_ERR(DTUN, LOGL_ERROR, errno, "ioctl() failed"); |
Harald Welte | 9e6dfa0 | 2017-08-12 15:06:19 +0200 | [diff] [blame] | 620 | goto err_close; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 621 | } |
| 622 | |
| 623 | strncpy((*tun)->devname, ifr.ifr_name, IFNAMSIZ); |
| 624 | (*tun)->devname[IFNAMSIZ - 1] = 0; |
| 625 | |
| 626 | ioctl((*tun)->fd, TUNSETNOCSUM, 1); /* Disable checksums */ |
| 627 | return 0; |
| 628 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 629 | #elif defined(__FreeBSD__) || defined (__APPLE__) |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 630 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 631 | /* Find suitable device */ |
| 632 | for (devnum = 0; devnum < 255; devnum++) { /* TODO 255 */ |
| 633 | snprintf(devname, sizeof(devname), "/dev/tun%d", devnum); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 634 | if (((*tun)->fd = open(devname, O_RDWR)) >= 0) |
| 635 | break; |
| 636 | if (errno != EBUSY) |
| 637 | break; |
| 638 | } |
| 639 | if ((*tun)->fd < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 640 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 641 | "Can't find tunnel device"); |
Harald Welte | 9e6dfa0 | 2017-08-12 15:06:19 +0200 | [diff] [blame] | 642 | goto err_free; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 643 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 644 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 645 | snprintf((*tun)->devname, sizeof((*tun)->devname), "tun%d", devnum); |
Harald Welte | 81bc2ae | 2017-08-11 12:56:30 +0200 | [diff] [blame] | 646 | (*tun)->devname[sizeof((*tun)->devname)-1] = 0; |
jjako | 1f15864 | 2004-02-05 20:39:57 +0000 | [diff] [blame] | 647 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 648 | /* The tun device we found might have "old" IP addresses allocated */ |
| 649 | /* We need to delete those. This problem is not present on Linux */ |
jjako | 1f15864 | 2004-02-05 20:39:57 +0000 | [diff] [blame] | 650 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 651 | memset(&areq, 0, sizeof(areq)); |
jjako | 1f15864 | 2004-02-05 20:39:57 +0000 | [diff] [blame] | 652 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 653 | /* Set up interface name */ |
| 654 | strncpy(areq.ifra_name, (*tun)->devname, IFNAMSIZ); |
| 655 | areq.ifra_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ |
jjako | 1f15864 | 2004-02-05 20:39:57 +0000 | [diff] [blame] | 656 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 657 | /* Create a channel to the NET kernel. */ |
| 658 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 659 | SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); |
Harald Welte | 9e6dfa0 | 2017-08-12 15:06:19 +0200 | [diff] [blame] | 660 | goto err_close; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 661 | } |
jjako | 1f15864 | 2004-02-05 20:39:57 +0000 | [diff] [blame] | 662 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 663 | /* Delete any IP addresses until SIOCDIFADDR fails */ |
| 664 | while (ioctl(fd, SIOCDIFADDR, (void *)&areq) != -1) ; |
| 665 | |
| 666 | close(fd); |
| 667 | return 0; |
jjako | 409b855 | 2004-02-04 22:57:41 +0000 | [diff] [blame] | 668 | #endif |
| 669 | |
Harald Welte | 9e6dfa0 | 2017-08-12 15:06:19 +0200 | [diff] [blame] | 670 | err_close: |
| 671 | close((*tun)->fd); |
| 672 | err_free: |
| 673 | free(*tun); |
| 674 | *tun = NULL; |
| 675 | return -1; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 676 | } |
| 677 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 678 | int tun_free(struct tun_t *tun) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 679 | { |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 680 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 681 | if (tun->routes) { |
| 682 | tun_delroute(tun, &tun->dstaddr, &tun->addr, &tun->netmask); |
| 683 | } |
jjako | 163b455 | 2004-12-30 15:33:58 +0000 | [diff] [blame] | 684 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 685 | if (close(tun->fd)) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 686 | SYS_ERR(DTUN, LOGL_ERROR, errno, "close() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 687 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 688 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 689 | /* TODO: For solaris we need to unlink streams */ |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 690 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 691 | free(tun); |
| 692 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 693 | } |
| 694 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 695 | int tun_set_cb_ind(struct tun_t *this, |
| 696 | int (*cb_ind) (struct tun_t * tun, void *pack, unsigned len)) |
| 697 | { |
| 698 | this->cb_ind = cb_ind; |
| 699 | return 0; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 700 | } |
| 701 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 702 | int tun_decaps(struct tun_t *this) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 703 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 704 | unsigned char buffer[PACKET_MAX]; |
| 705 | int status; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 706 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 707 | if ((status = read(this->fd, buffer, sizeof(buffer))) <= 0) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 708 | SYS_ERR(DTUN, LOGL_ERROR, errno, "read() failed"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 709 | return -1; |
| 710 | } |
| 711 | |
| 712 | if (this->cb_ind) |
| 713 | return this->cb_ind(this, buffer, status); |
| 714 | |
| 715 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | int tun_encaps(struct tun_t *tun, void *pack, unsigned len) |
| 719 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 720 | return write(tun->fd, pack, len); |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 721 | } |
| 722 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 723 | int tun_runscript(struct tun_t *tun, char *script) |
| 724 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 725 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 726 | char buf[TUN_SCRIPTSIZE]; |
| 727 | char snet[TUN_ADDRSIZE]; |
| 728 | char smask[TUN_ADDRSIZE]; |
| 729 | int rc; |
| 730 | |
| 731 | strncpy(snet, inet_ntoa(tun->addr), sizeof(snet)); |
| 732 | snet[sizeof(snet) - 1] = 0; |
| 733 | strncpy(smask, inet_ntoa(tun->netmask), sizeof(smask)); |
| 734 | smask[sizeof(smask) - 1] = 0; |
| 735 | |
| 736 | /* system("ipup /dev/tun0 192.168.0.10 255.255.255.0"); */ |
| 737 | snprintf(buf, sizeof(buf), "%s %s %s %s", |
| 738 | script, tun->devname, snet, smask); |
| 739 | buf[sizeof(buf) - 1] = 0; |
| 740 | rc = system(buf); |
| 741 | if (rc == -1) { |
Holger Hans Peter Freyther | 9c7fd8e | 2014-12-04 16:32:37 +0100 | [diff] [blame] | 742 | SYS_ERR(DTUN, LOGL_ERROR, errno, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 743 | "Error executing command %s", buf); |
| 744 | return -1; |
| 745 | } |
| 746 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 747 | } |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 748 | |
| 749 | #include <ifaddrs.h> |
| 750 | |
Harald Welte | 4c7d291 | 2017-11-08 15:19:17 +0900 | [diff] [blame] | 751 | /*! Obtain the local address of a network device |
| 752 | * \param[in] devname Target device owning the IP |
Pau Espin Pedrol | a037e59 | 2017-10-16 14:41:37 +0200 | [diff] [blame] | 753 | * \param[out] prefix_list List of prefix structures to fill with each IPv4/6 and prefix length found. |
| 754 | * \param[in] prefix_size Amount of elements allowed to be fill in the prefix_list array. |
| 755 | * \param[in] flags Specify which kind of IP to look for: IP_TYPE_IPv4, IP_TYPE_IPv6_LINK, IP_TYPE_IPv6_NONLINK |
| 756 | * \returns The number of ips found following the criteria specified by flags, -1 on error. |
| 757 | * |
| 758 | * This function will fill prefix_list with up to prefix_size IPs following the |
| 759 | * criteria specified by flags parameter. It returns the number of IPs matching |
| 760 | * the criteria. As a result, the number returned can be bigger than |
| 761 | * prefix_size. It can be used with prefix_size=0 to get an estimate of the size |
| 762 | * needed for prefix_list. |
| 763 | */ |
Harald Welte | 4c7d291 | 2017-11-08 15:19:17 +0900 | [diff] [blame] | 764 | int netdev_ip_local_get(const char *devname, struct in46_prefix *prefix_list, size_t prefix_size, int flags) |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 765 | { |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 766 | static const uint8_t ll_prefix[] = { 0xfe,0x80, 0,0, 0,0, 0,0 }; |
Pau Espin Pedrol | a037e59 | 2017-10-16 14:41:37 +0200 | [diff] [blame] | 767 | struct ifaddrs *ifaddr, *ifa; |
| 768 | struct in46_addr netmask; |
| 769 | size_t count = 0; |
| 770 | bool is_ipv6_ll; |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 771 | |
| 772 | if (getifaddrs(&ifaddr) == -1) { |
| 773 | return -1; |
| 774 | } |
| 775 | |
| 776 | for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 777 | if (ifa->ifa_addr == NULL) |
| 778 | continue; |
| 779 | |
Harald Welte | 4c7d291 | 2017-11-08 15:19:17 +0900 | [diff] [blame] | 780 | if (strcmp(ifa->ifa_name, devname)) |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 781 | continue; |
| 782 | |
Pau Espin Pedrol | a037e59 | 2017-10-16 14:41:37 +0200 | [diff] [blame] | 783 | if (ifa->ifa_addr->sa_family == AF_INET && (flags & IP_TYPE_IPv4)) { |
| 784 | struct sockaddr_in *sin4 = (struct sockaddr_in *) ifa->ifa_addr; |
| 785 | struct sockaddr_in *netmask4 = (struct sockaddr_in *) ifa->ifa_netmask; |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 786 | |
Pau Espin Pedrol | a037e59 | 2017-10-16 14:41:37 +0200 | [diff] [blame] | 787 | if (count < prefix_size) { |
| 788 | netmask.len = sizeof(netmask4->sin_addr); |
| 789 | netmask.v4 = netmask4->sin_addr; |
| 790 | prefix_list[count].addr.len = sizeof(sin4->sin_addr); |
| 791 | prefix_list[count].addr.v4 = sin4->sin_addr; |
| 792 | prefix_list[count].prefixlen = in46a_netmasklen(&netmask); |
| 793 | } |
| 794 | count++; |
| 795 | } |
| 796 | |
| 797 | if (ifa->ifa_addr->sa_family == AF_INET6 && (flags & IP_TYPE_IPv6)) { |
| 798 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; |
| 799 | struct sockaddr_in6 *netmask6 = (struct sockaddr_in6 *) ifa->ifa_netmask; |
| 800 | |
| 801 | is_ipv6_ll = !memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix)); |
| 802 | if ((flags & IP_TYPE_IPv6_NONLINK) && is_ipv6_ll) |
| 803 | continue; |
| 804 | if ((flags & IP_TYPE_IPv6_LINK) && !is_ipv6_ll) |
| 805 | continue; |
| 806 | |
| 807 | if (count < prefix_size) { |
| 808 | netmask.len = sizeof(netmask6->sin6_addr); |
| 809 | netmask.v6 = netmask6->sin6_addr; |
| 810 | prefix_list[count].addr.len = sizeof(sin6->sin6_addr); |
| 811 | prefix_list[count].addr.v6 = sin6->sin6_addr; |
| 812 | prefix_list[count].prefixlen = in46a_netmasklen(&netmask); |
| 813 | } |
| 814 | count++; |
| 815 | } |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 816 | } |
Pau Espin Pedrol | a037e59 | 2017-10-16 14:41:37 +0200 | [diff] [blame] | 817 | |
Pau Espin Pedrol | 58c0da7 | 2017-10-12 16:42:46 +0200 | [diff] [blame] | 818 | freeifaddrs(ifaddr); |
Pau Espin Pedrol | a037e59 | 2017-10-16 14:41:37 +0200 | [diff] [blame] | 819 | return count; |
Harald Welte | f85fe97 | 2017-09-24 20:00:34 +0800 | [diff] [blame] | 820 | } |
Harald Welte | 4c7d291 | 2017-11-08 15:19:17 +0900 | [diff] [blame] | 821 | |
| 822 | /*! Obtain the local address of the tun device. |
| 823 | * \param[in] tun Target device owning the IP |
| 824 | * \param[out] prefix_list List of prefix structures to fill with each IPv4/6 and prefix length found. |
| 825 | * \param[in] prefix_size Amount of elements allowed to be fill in the prefix_list array. |
| 826 | * \param[in] flags Specify which kind of IP to look for: IP_TYPE_IPv4, IP_TYPE_IPv6_LINK, IP_TYPE_IPv6_NONLINK |
| 827 | * \returns The number of ips found following the criteria specified by flags, -1 on error. |
| 828 | * |
| 829 | * This function will fill prefix_list with up to prefix_size IPs following the |
| 830 | * criteria specified by flags parameter. It returns the number of IPs matching |
| 831 | * the criteria. As a result, the number returned can be bigger than |
| 832 | * prefix_size. It can be used with prefix_size=0 to get an estimate of the size |
| 833 | * needed for prefix_list. |
| 834 | */ |
| 835 | int tun_ip_local_get(const struct tun_t *tun, struct in46_prefix *prefix_list, size_t prefix_size, int flags) |
| 836 | { |
| 837 | return netdev_ip_local_get(tun->devname, prefix_list, prefix_size, flags); |
| 838 | } |