jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1 | /* |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 2 | * TUN interface functions. |
| 3 | * Copyright (C) 2002, 2003 Mondru AB. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 4 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 5 | * The contents of this file may be used under the terms of the GNU |
| 6 | * General Public License Version 2, provided that the above copyright |
| 7 | * notice and this permission notice is included in all copies or |
| 8 | * substantial portions of the software. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 9 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 10 | * The initial developer of the original code is |
| 11 | * Jens Jakobsen <jj@openggsn.org> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 12 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 13 | * Contributor(s): |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 14 | * |
| 15 | */ |
| 16 | |
| 17 | /* |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 18 | * tun.c: Contains all TUN functionality. Is able to handle multiple |
| 19 | * tunnels in the same program. Each tunnel is identified by the struct, |
| 20 | * which is passed to functions. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 21 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 22 | */ |
| 23 | |
| 24 | |
| 25 | #include <syslog.h> |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <netinet/in.h> |
| 31 | #include <arpa/inet.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <sys/time.h> |
| 34 | #include <unistd.h> |
| 35 | #include <string.h> |
| 36 | #include <errno.h> |
| 37 | #include <fcntl.h> |
| 38 | |
| 39 | #include <stdio.h> |
| 40 | #include <fcntl.h> |
| 41 | #include <unistd.h> |
| 42 | #include <sys/time.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 43 | #include <sys/ioctl.h> |
| 44 | #include <sys/socket.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 45 | #include <errno.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 46 | #include <net/route.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 47 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 48 | #ifdef __linux__ |
| 49 | #include <linux/if.h> |
| 50 | #include <linux/if_tun.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 51 | #include <linux/netlink.h> |
| 52 | #include <linux/rtnetlink.h> |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 53 | #elif defined (__sun__) |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 54 | #include <stropts.h> |
| 55 | #include <sys/sockio.h> |
| 56 | #include <net/if.h> |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 57 | #include <net/if_tun.h> |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 58 | /*#include "sun_if_tun.h"*/ |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 59 | #elif defined (__FreeBSD__) |
| 60 | #include <net/if.h> |
| 61 | #include <net/if_tun.h> |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 62 | #endif |
| 63 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 64 | |
| 65 | #include "tun.h" |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 66 | #include "syserr.h" |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 67 | |
| 68 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 69 | #ifdef __linux__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 70 | 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] | 71 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 72 | int len = RTA_LENGTH(dlen); |
| 73 | int alen = NLMSG_ALIGN(n->nlmsg_len); |
| 74 | struct rtattr *rta = (struct rtattr*) (((void*)n) + alen); |
| 75 | if (alen + len > nsize) |
| 76 | return -1; |
| 77 | rta->rta_len = len; |
| 78 | rta->rta_type = type; |
| 79 | memcpy(RTA_DATA(rta), d, dlen); |
| 80 | n->nlmsg_len = alen + len; |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | int tun_gifindex(struct tun_t *this, int *index) { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 85 | struct ifreq ifr; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 86 | int fd; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 87 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 88 | memset (&ifr, '\0', sizeof (ifr)); |
| 89 | ifr.ifr_addr.sa_family = AF_INET; |
| 90 | ifr.ifr_dstaddr.sa_family = AF_INET; |
| 91 | ifr.ifr_netmask.sa_family = AF_INET; |
| 92 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 93 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 94 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 95 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 96 | "socket() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 97 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 98 | if (ioctl(fd, SIOCGIFINDEX, &ifr)) { |
| 99 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 100 | "ioctl() failed"); |
| 101 | close(fd); |
| 102 | return -1; |
| 103 | } |
| 104 | close(fd); |
| 105 | *index = ifr.ifr_ifindex; |
| 106 | return 0; |
| 107 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 108 | #endif |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 109 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 110 | int tun_sifflags(struct tun_t *this, int flags) { |
| 111 | struct ifreq ifr; |
| 112 | int fd; |
| 113 | |
| 114 | memset (&ifr, '\0', sizeof (ifr)); |
| 115 | ifr.ifr_flags = flags; |
| 116 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 117 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 118 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 119 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 120 | "socket() failed"); |
| 121 | } |
| 122 | if (ioctl(fd, SIOCSIFFLAGS, &ifr)) { |
| 123 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 124 | "ioctl(SIOCSIFFLAGS) failed"); |
| 125 | close(fd); |
| 126 | return -1; |
| 127 | } |
| 128 | close(fd); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 133 | /* Currently unused |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 134 | int tun_addroute2(struct tun_t *this, |
| 135 | struct in_addr *dst, |
| 136 | struct in_addr *gateway, |
| 137 | struct in_addr *mask) { |
| 138 | |
| 139 | struct { |
| 140 | struct nlmsghdr n; |
| 141 | struct rtmsg r; |
| 142 | char buf[TUN_NLBUFSIZE]; |
| 143 | } req; |
| 144 | |
| 145 | struct sockaddr_nl local; |
| 146 | int addr_len; |
| 147 | int fd; |
| 148 | int status; |
| 149 | struct sockaddr_nl nladdr; |
| 150 | struct iovec iov; |
| 151 | struct msghdr msg; |
| 152 | |
| 153 | memset(&req, 0, sizeof(req)); |
| 154 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 155 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 156 | req.n.nlmsg_type = RTM_NEWROUTE; |
| 157 | req.r.rtm_family = AF_INET; |
| 158 | req.r.rtm_table = RT_TABLE_MAIN; |
| 159 | req.r.rtm_protocol = RTPROT_BOOT; |
| 160 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 161 | req.r.rtm_type = RTN_UNICAST; |
| 162 | tun_nlattr(&req.n, sizeof(req), RTA_DST, dst, 4); |
| 163 | tun_nlattr(&req.n, sizeof(req), RTA_GATEWAY, gateway, 4); |
| 164 | |
| 165 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 166 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 167 | "socket() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 168 | return -1; |
| 169 | } |
| 170 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 171 | memset(&local, 0, sizeof(local)); |
| 172 | local.nl_family = AF_NETLINK; |
| 173 | local.nl_groups = 0; |
| 174 | |
| 175 | if (bind(fd, (struct sockaddr*)&local, sizeof(local)) < 0) { |
| 176 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 177 | "bind() failed"); |
| 178 | close(fd); |
| 179 | return -1; |
| 180 | } |
| 181 | |
| 182 | addr_len = sizeof(local); |
| 183 | if (getsockname(fd, (struct sockaddr*)&local, &addr_len) < 0) { |
| 184 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 185 | "getsockname() failed"); |
| 186 | close(fd); |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | if (addr_len != sizeof(local)) { |
| 191 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 192 | "Wrong address length %d", addr_len); |
| 193 | close(fd); |
| 194 | return -1; |
| 195 | } |
| 196 | |
| 197 | if (local.nl_family != AF_NETLINK) { |
| 198 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 199 | "Wrong address family %d", local.nl_family); |
| 200 | close(fd); |
| 201 | return -1; |
| 202 | } |
| 203 | |
| 204 | iov.iov_base = (void*)&req.n; |
| 205 | iov.iov_len = req.n.nlmsg_len; |
| 206 | |
| 207 | msg.msg_name = (void*)&nladdr; |
| 208 | msg.msg_namelen = sizeof(nladdr), |
| 209 | msg.msg_iov = &iov; |
| 210 | msg.msg_iovlen = 1; |
| 211 | msg.msg_control = NULL; |
| 212 | msg.msg_controllen = 0; |
| 213 | msg.msg_flags = 0; |
| 214 | |
| 215 | memset(&nladdr, 0, sizeof(nladdr)); |
| 216 | nladdr.nl_family = AF_NETLINK; |
| 217 | nladdr.nl_pid = 0; |
| 218 | nladdr.nl_groups = 0; |
| 219 | |
| 220 | req.n.nlmsg_seq = 0; |
| 221 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 222 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 223 | status = sendmsg(fd, &msg, 0); * TODO: Error check * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 224 | close(fd); |
| 225 | return 0; |
| 226 | } |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 227 | */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 228 | |
| 229 | int tun_addaddr(struct tun_t *this, |
| 230 | struct in_addr *addr, |
| 231 | struct in_addr *dstaddr, |
| 232 | struct in_addr *netmask) { |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 233 | |
| 234 | #ifdef __linux__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 235 | struct { |
| 236 | struct nlmsghdr n; |
| 237 | struct ifaddrmsg i; |
| 238 | char buf[TUN_NLBUFSIZE]; |
| 239 | } req; |
| 240 | |
| 241 | struct sockaddr_nl local; |
| 242 | int addr_len; |
| 243 | int fd; |
| 244 | int status; |
| 245 | |
| 246 | struct sockaddr_nl nladdr; |
| 247 | struct iovec iov; |
| 248 | struct msghdr msg; |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 249 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 250 | |
| 251 | if (!this->addrs) /* Use ioctl for first addr to make ping work */ |
| 252 | return tun_setaddr(this, addr, dstaddr, netmask); |
| 253 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 254 | #ifndef __linux__ |
| 255 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 256 | "Setting multiple addresses only possible on linux"); |
| 257 | return -1; |
| 258 | #else |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 259 | memset(&req, 0, sizeof(req)); |
| 260 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 261 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 262 | req.n.nlmsg_type = RTM_NEWADDR; |
| 263 | req.i.ifa_family = AF_INET; |
| 264 | req.i.ifa_prefixlen = 32; /* 32 FOR IPv4 */ |
| 265 | req.i.ifa_flags = 0; |
| 266 | req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */ |
| 267 | if (tun_gifindex(this, &req.i.ifa_index)) { |
| 268 | return -1; |
| 269 | } |
| 270 | |
| 271 | tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(addr)); |
| 272 | tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(dstaddr)); |
| 273 | |
| 274 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 275 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 276 | "socket() failed"); |
| 277 | return -1; |
| 278 | } |
| 279 | |
| 280 | memset(&local, 0, sizeof(local)); |
| 281 | local.nl_family = AF_NETLINK; |
| 282 | local.nl_groups = 0; |
| 283 | |
| 284 | if (bind(fd, (struct sockaddr*)&local, sizeof(local)) < 0) { |
| 285 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 286 | "bind() failed"); |
| 287 | close(fd); |
| 288 | return -1; |
| 289 | } |
| 290 | |
| 291 | addr_len = sizeof(local); |
| 292 | if (getsockname(fd, (struct sockaddr*)&local, &addr_len) < 0) { |
| 293 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 294 | "getsockname() failed"); |
| 295 | close(fd); |
| 296 | return -1; |
| 297 | } |
| 298 | |
| 299 | if (addr_len != sizeof(local)) { |
| 300 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 301 | "Wrong address length %d", addr_len); |
| 302 | close(fd); |
| 303 | return -1; |
| 304 | } |
| 305 | |
| 306 | if (local.nl_family != AF_NETLINK) { |
| 307 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 308 | "Wrong address family %d", local.nl_family); |
| 309 | close(fd); |
| 310 | return -1; |
| 311 | } |
| 312 | |
| 313 | iov.iov_base = (void*)&req.n; |
| 314 | iov.iov_len = req.n.nlmsg_len; |
| 315 | |
| 316 | msg.msg_name = (void*)&nladdr; |
| 317 | msg.msg_namelen = sizeof(nladdr), |
| 318 | msg.msg_iov = &iov; |
| 319 | msg.msg_iovlen = 1; |
| 320 | msg.msg_control = NULL; |
| 321 | msg.msg_controllen = 0; |
| 322 | msg.msg_flags = 0; |
| 323 | |
| 324 | memset(&nladdr, 0, sizeof(nladdr)); |
| 325 | nladdr.nl_family = AF_NETLINK; |
| 326 | nladdr.nl_pid = 0; |
| 327 | nladdr.nl_groups = 0; |
| 328 | |
| 329 | req.n.nlmsg_seq = 0; |
| 330 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 331 | |
| 332 | status = sendmsg(fd, &msg, 0); /* TODO Error check */ |
| 333 | |
| 334 | tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 335 | close(fd); |
| 336 | this->addrs++; |
| 337 | return 0; |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 338 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | |
| 342 | int tun_setaddr(struct tun_t *this, |
| 343 | struct in_addr *addr, |
| 344 | struct in_addr *dstaddr, |
| 345 | struct in_addr *netmask) |
| 346 | { |
| 347 | struct ifreq ifr; |
| 348 | int fd; |
| 349 | |
| 350 | memset (&ifr, '\0', sizeof (ifr)); |
| 351 | ifr.ifr_addr.sa_family = AF_INET; |
| 352 | ifr.ifr_dstaddr.sa_family = AF_INET; |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 353 | #ifdef __linux__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 354 | ifr.ifr_netmask.sa_family = AF_INET; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 355 | #endif |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 356 | #ifdef __FreeBSD__ |
| 357 | ((struct sockaddr_in *) &ifr.ifr_addr)->sin_len = |
| 358 | sizeof (struct sockaddr_in); |
| 359 | ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_len = |
| 360 | sizeof (struct sockaddr_in); |
| 361 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 362 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 363 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 364 | |
| 365 | /* Create a channel to the NET kernel. */ |
| 366 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 367 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 368 | "socket() failed"); |
| 369 | return -1; |
| 370 | } |
| 371 | |
| 372 | if (addr) { /* Set the interface address */ |
| 373 | this->addr.s_addr = addr->s_addr; |
| 374 | ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = addr->s_addr; |
| 375 | if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) { |
| 376 | if (errno != EEXIST) { |
| 377 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 378 | "ioctl(SIOCSIFADDR) failed"); |
| 379 | } |
| 380 | else { |
| 381 | sys_err(LOG_WARNING, __FILE__, __LINE__, errno, |
| 382 | "ioctl(SIOCSIFADDR): Address already exists"); |
| 383 | } |
| 384 | close(fd); |
| 385 | return -1; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | if (dstaddr) { /* Set the destination address */ |
| 390 | this->dstaddr.s_addr = dstaddr->s_addr; |
| 391 | ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = |
| 392 | dstaddr->s_addr; |
| 393 | if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) { |
| 394 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 395 | "ioctl(SIOCSIFDSTADDR) failed"); |
| 396 | close(fd); |
| 397 | return -1; |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | if (netmask) { /* Set the netmask */ |
| 402 | this->netmask.s_addr = netmask->s_addr; |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 403 | #if defined(__sun__) |
| 404 | /* TODO: This should probably be ifr_addr */ |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 405 | ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 406 | netmask->s_addr; |
| 407 | #elif defined(__FreeBSD__) |
| 408 | ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = |
| 409 | netmask->s_addr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 410 | #else |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 411 | ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = |
| 412 | netmask->s_addr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 413 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 414 | if (ioctl(fd, SIOCSIFNETMASK, (void *) &ifr) < 0) { |
| 415 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 416 | "ioctl(SIOCSIFNETMASK) failed"); |
| 417 | close(fd); |
| 418 | return -1; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | close(fd); |
| 423 | this->addrs++; |
| 424 | return tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 425 | } |
| 426 | |
| 427 | int tun_addroute(struct tun_t *this, |
| 428 | struct in_addr *dst, |
| 429 | struct in_addr *gateway, |
| 430 | struct in_addr *mask) |
| 431 | { |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 432 | |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 433 | /* TODO: Learn how to set routing table on sun and FreeBSD */ |
| 434 | #ifdef __linux__ |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 435 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 436 | struct rtentry r; |
| 437 | int fd; |
| 438 | |
| 439 | memset (&r, '\0', sizeof (r)); |
| 440 | r.rt_flags = RTF_UP | RTF_GATEWAY; /* RTF_HOST not set */ |
| 441 | |
| 442 | /* Create a channel to the NET kernel. */ |
| 443 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 444 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 445 | "socket() failed"); |
| 446 | return -1; |
| 447 | } |
| 448 | |
| 449 | r.rt_dst.sa_family = AF_INET; |
| 450 | r.rt_gateway.sa_family = AF_INET; |
| 451 | r.rt_genmask.sa_family = AF_INET; |
| 452 | ((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr = dst->s_addr; |
| 453 | ((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr = gateway->s_addr; |
| 454 | ((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr = mask->s_addr; |
| 455 | |
| 456 | if (ioctl(fd, SIOCADDRT, (void *) &r) < 0) { /* SIOCDELRT */ |
| 457 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 458 | "ioctl(SIOCADDRT) failed"); |
| 459 | close(fd); |
| 460 | return -1; |
| 461 | } |
| 462 | close(fd); |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 463 | |
jjako | 3eaf453 | 2004-01-27 19:47:49 +0000 | [diff] [blame^] | 464 | #elif defined(__FreeBSD__) |
| 465 | |
| 466 | struct my_rt |
| 467 | { |
| 468 | struct rt_msghdr rt; |
| 469 | struct sockaddr_in dst; |
| 470 | struct sockaddr_in gate; |
| 471 | struct sockaddr_in mask; |
| 472 | } my_rt; |
| 473 | |
| 474 | int s; |
| 475 | struct rt_msghdr *rtm; |
| 476 | struct sockaddr_in *dst, *gate, *mask; |
| 477 | |
| 478 | if((s = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) |
| 479 | { |
| 480 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 481 | "socket() failed"); |
| 482 | return -1; |
| 483 | } |
| 484 | |
| 485 | memset(&my_rt, 0x00, sizeof(my_rt)); |
| 486 | |
| 487 | rtm = &my_rt.rt; |
| 488 | |
| 489 | dst = &my_rt.dst; |
| 490 | gate = &my_rt.gate; |
| 491 | mask = &my_rt.mask; |
| 492 | |
| 493 | rtm->rtm_type = RTM_ADD; |
| 494 | rtm->rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; /* TODO */ |
| 495 | rtm->rtm_msglen = sizeof(my_rt); |
| 496 | rtm->rtm_version = RTM_VERSION; |
| 497 | rtm->rtm_seq = 1234; /* TODO */ |
| 498 | rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; |
| 499 | rtm->rtm_pid = getpid(); |
| 500 | |
| 501 | dst->sin_family = AF_INET; |
| 502 | dst->sin_len = sizeof(*dst); |
| 503 | dst->sin_addr.s_addr = dst->s_addr; |
| 504 | |
| 505 | mask->sin_family = AF_INET; |
| 506 | mask->sin_len = sizeof(*mask); |
| 507 | mask->sin_addr.s_addr = mask->s_addr; |
| 508 | |
| 509 | gate->sin_family = AF_INET; |
| 510 | gate->sin_len = sizeof(*gate); |
| 511 | gate->sin_addr.s_addr = gateway->s_addr; |
| 512 | |
| 513 | AGAIN: |
| 514 | if(write(s, rtm, rtm->rtm_msglen) < 0) |
| 515 | { |
| 516 | if(errno == EEXIST && rtm->rtm_type == RTM_ADD) |
| 517 | { |
| 518 | rtm->rtm_type = RTM_CHANGE; |
| 519 | goto AGAIN; |
| 520 | } |
| 521 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 522 | "write() failed"); |
| 523 | return -1; |
| 524 | } |
| 525 | return 0; |
| 526 | |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 527 | #endif |
| 528 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | |
| 533 | int tun_new(struct tun_t **tun) |
| 534 | { |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 535 | |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 536 | #ifdef __sun__ |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 537 | int if_fd, ppa = -1; |
| 538 | static int ip_fd = 0; |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 539 | #elif defined(__FreeBSD__) |
| 540 | char devname[IFNAMSIZ+5]; /* "/dev/" + ifname */ |
| 541 | int devnum; |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 542 | #else |
| 543 | struct ifreq ifr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 544 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 545 | |
| 546 | if (!(*tun = calloc(1, sizeof(struct tun_t)))) { |
| 547 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "calloc() failed"); |
| 548 | return EOF; |
| 549 | } |
| 550 | |
| 551 | (*tun)->cb_ind = NULL; |
| 552 | (*tun)->addrs = 0; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 553 | |
| 554 | #ifdef __linux__ |
| 555 | /* Open the actual tun device */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 556 | if (((*tun)->fd = open("/dev/net/tun", O_RDWR)) < 0) { |
| 557 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "open() failed"); |
| 558 | return -1; |
| 559 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 560 | |
| 561 | /* Set device flags. For some weird reason this is also the method |
| 562 | used to obtain the network interface name */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 563 | memset(&ifr, 0, sizeof(ifr)); |
| 564 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Tun device, no packet info */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 565 | if (ioctl((*tun)->fd, TUNSETIFF, (void *) &ifr) < 0) { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 566 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "ioctl() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 567 | close((*tun)->fd); |
| 568 | return -1; |
| 569 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 570 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 571 | strncpy((*tun)->devname, ifr.ifr_name, IFNAMSIZ); |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 572 | (*tun)->devname[IFNAMSIZ] = 0; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 573 | |
| 574 | ioctl((*tun)->fd, TUNSETNOCSUM, 1); /* Disable checksums */ |
| 575 | |
| 576 | #endif |
| 577 | |
| 578 | #ifdef __sun__ |
| 579 | |
| 580 | if( (ip_fd = open("/dev/ip", O_RDWR, 0)) < 0){ |
| 581 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "Can't open /dev/ip"); |
| 582 | return -1; |
| 583 | } |
| 584 | |
| 585 | if( ((*tun)->fd = open("/dev/tun", O_RDWR, 0)) < 0){ |
| 586 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "Can't open /dev/tun"); |
| 587 | return -1; |
| 588 | } |
| 589 | |
| 590 | /* Assign a new PPA and get its unit number. */ |
| 591 | if( (ppa = ioctl((*tun)->fd, TUNNEWPPA, -1)) < 0){ |
| 592 | syslog(LOG_ERR, "Can't assign new interface"); |
| 593 | return -1; |
| 594 | } |
| 595 | |
| 596 | if( (if_fd = open("/dev/tun", O_RDWR, 0)) < 0){ |
| 597 | syslog(LOG_ERR, "Can't open /dev/tun (2)"); |
| 598 | return -1; |
| 599 | } |
| 600 | if(ioctl(if_fd, I_PUSH, "ip") < 0){ |
| 601 | syslog(LOG_ERR, "Can't push IP module"); |
| 602 | return -1; |
| 603 | } |
| 604 | |
| 605 | /* Assign ppa according to the unit number returned by tun device */ |
| 606 | if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0){ |
| 607 | syslog(LOG_ERR, "Can't set PPA %d", ppa); |
| 608 | return -1; |
| 609 | } |
| 610 | |
| 611 | /* Link the two streams */ |
| 612 | if(ioctl(ip_fd, I_LINK, if_fd) < 0){ |
| 613 | syslog(LOG_ERR, "Can't link TUN device to IP"); |
| 614 | return -1; |
| 615 | } |
| 616 | |
| 617 | close (if_fd); |
| 618 | |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 619 | snprintf((*tun)->devname, sizeof((*tun)->devname), "tun%d", ppa); |
| 620 | (*tun)->devname[sizeof((*tun)->devname)] = 0; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 621 | |
| 622 | #endif |
jjako | 243bfe6 | 2004-01-26 23:06:05 +0000 | [diff] [blame] | 623 | |
| 624 | #ifdef __FreeBSD__ |
| 625 | /* Find suitable device */ |
| 626 | for (devnum = 0; devnum < 255; devnum++) { /* TODO 255 */ |
| 627 | snprintf(devname, sizeof(devname), "/dev/tun%d", devnum); |
| 628 | devname[sizeof(devname)] = 0; |
| 629 | if (((*tun)->fd = open(devname, O_RDWR)) >= 0) break; |
| 630 | if (errno != EBUSY) break; |
| 631 | } |
| 632 | if ((*tun)->fd < 0) { |
| 633 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "Can't find tunnel device"); |
| 634 | return -1; |
| 635 | } |
| 636 | |
| 637 | snprintf((*tun)->devname, sizeof((*tun)->devname), "tun%d", devnum); |
| 638 | (*tun)->devname[sizeof((*tun)->devname)] = 0; |
| 639 | #endif |
| 640 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 641 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 642 | } |
| 643 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 644 | int tun_free(struct tun_t *tun) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 645 | { |
| 646 | if (close(tun->fd)) { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 647 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "close() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 648 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 649 | |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 650 | /* TODO: For solaris we need to unlink streams */ |
| 651 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 652 | free(tun); |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 657 | int tun_set_cb_ind(struct tun_t *this, |
| 658 | int (*cb_ind) (struct tun_t *tun, void *pack, unsigned len)) { |
| 659 | this->cb_ind = cb_ind; |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | |
| 664 | int tun_decaps(struct tun_t *this) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 665 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 666 | unsigned char buffer[PACKET_MAX]; |
| 667 | int status; |
| 668 | |
| 669 | if ((status = read(this->fd, buffer, sizeof(buffer))) <= 0) { |
| 670 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "read() failed"); |
| 671 | return -1; |
| 672 | } |
| 673 | |
| 674 | if (this->cb_ind) |
| 675 | return this->cb_ind(this, buffer, status); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 676 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 677 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | int tun_encaps(struct tun_t *tun, void *pack, unsigned len) |
| 681 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 682 | return write(tun->fd, pack, len); |
| 683 | } |
| 684 | |
| 685 | int tun_runscript(struct tun_t *tun, char* script) { |
| 686 | |
| 687 | char buf[TUN_SCRIPTSIZE]; |
| 688 | char snet[TUN_ADDRSIZE]; |
| 689 | char smask[TUN_ADDRSIZE]; |
| 690 | |
| 691 | strncpy(snet, inet_ntoa(tun->addr), sizeof(snet)); |
| 692 | snet[sizeof(snet)-1] = 0; |
| 693 | strncpy(smask, inet_ntoa(tun->netmask), sizeof(smask)); |
| 694 | smask[sizeof(smask)-1] = 0; |
| 695 | |
| 696 | /* system("ipup /dev/tun0 192.168.0.10 255.255.255.0"); */ |
| 697 | snprintf(buf, sizeof(buf), "%s %s %s %s", |
| 698 | script, tun->devname, snet, smask); |
| 699 | buf[sizeof(buf)-1] = 0; |
| 700 | system(buf); |
| 701 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 702 | } |