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/* source: xio-tun.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for opening addresses of tun/tap type */
#include "xiosysincludes.h"
#if WITH_TUN
#include "xioopen.h"
#include "xio-named.h"
#include "xio-socket.h"
#include "xio-ip.h"
#include "xio-interface.h"
#include "xio-netlink.h"
#include "xio-tun.h"
static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *xfd, const struct addrdesc *addrdesc);
/****** TUN options ******/
const struct optdesc opt_tun_device = { "tun-device", NULL, OPT_TUN_DEVICE, GROUP_TUN, PH_OPEN, TYPE_FILENAME, OFUNC_SPEC };
const struct optdesc opt_tun_name = { "tun-name", NULL, OPT_TUN_NAME, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };
const struct optdesc opt_tun_type = { "tun-type", NULL, OPT_TUN_TYPE, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };
const struct optdesc opt_iff_no_pi = { "iff-no-pi", "no-pi", OPT_IFF_NO_PI, GROUP_TUN, PH_FD, TYPE_BOOL, OFUNC_SPEC };
/****** TUN addresses ******/
const struct addrdesc xioaddr_tun = { "TUN", 3, xioopen_tun, GROUP_FD|GROUP_CHR|GROUP_OPEN|GROUP_TUN, 0, 0, 0 HELP("[:<ip-addr>/<bits>]") };
/* "if-name"=tun3
// "route"=address/netmask
// "ip6-route"=address/netmask
// "iff-broadcast"
// "iff-debug"
// "iff-promisc"
// see .../linux/if.h
*/
#if LATER
/* sub options for route option */
#define IFOPT_ROUTE 1
static const struct optdesc opt_route_tos = { "route", NULL, IFOPT_ROUTE, };
static const struct optname xio_route_options[] = {
{"tos", &xio_route_tos }
} ;
#endif
static int xioopen_tun(
int argc,
const char *argv[],
struct opt *opts,
int xioflags,
xiofile_t *xfd,
const struct addrdesc *addrdesc)
{
struct single *sfd = &xfd->stream;
char *tundevice = NULL;
char *tunname = NULL, *tuntype = NULL;
int pf = /*! PF_UNSPEC*/ PF_INET;
struct xiorange network;
bool no_pi = false;
const char *namedargv[] = { "tun", NULL, NULL };
int rw = (xioflags & XIO_ACCMODE);
bool exists;
struct ifreq ifr;
unsigned int ifidx;
int sockfd;
char *ifaddr;
unsigned int mtu;
int result;
if (argc > 2 || argc < 0) {
#if WITH_HELP
Error3("%s: wrong number of parameters (%d instead of 0 or 1); usage: %s",
argv[0], argc-1, addrdesc->syntax);
#else
Error2("%s: wrong number of parameters (%d instead of 0 or 1)",
argv[0], argc-1);
#endif
}
if (retropt_string(opts, OPT_TUN_DEVICE, &tundevice) != 0) {
tundevice = strdup("/dev/net/tun");
}
/*! socket option here? */
retropt_socket_pf(opts, &pf);
namedargv[1] = tundevice;
/* open the tun cloning device */
if ((result = _xioopen_named_early(2, namedargv, xfd, addrdesc->groups,
&exists, opts, addrdesc->syntax)) < 0) {
return result;
}
/*========================= the tunnel interface =========================*/
Notice("creating tunnel network interface");
applyopts_optgroup(&xfd->stream, -1, opts, GROUP_PROCESS);
if ((result = _xioopen_open(tundevice, rw, opts)) < 0)
return result;
sfd->fd = result;
/* prepare configuration of the new network interface */
memset(&ifr, 0, sizeof(ifr));
if (retropt_string(opts, OPT_TUN_NAME, &tunname) == 0) {
strncpy(ifr.ifr_name, tunname, IFNAMSIZ); /* ok */
free(tunname);
} else {
ifr.ifr_name[0] = '\0';
}
ifr.ifr_flags = IFF_TUN;
if (retropt_string(opts, OPT_TUN_TYPE, &tuntype) == 0) {
if (!strcmp(tuntype, "tap")) {
ifr.ifr_flags = IFF_TAP;
} else if (strcmp(tuntype, "tun")) {
Error1("unknown tun-type \"%s\"", tuntype);
}
}
if (retropt_bool(opts, OPT_IFF_NO_PI, &no_pi) == 0) {
if (no_pi) {
ifr.ifr_flags |= IFF_NO_PI;
#if 0 /* not necessary for now */
} else {
ifr.ifr_flags &= ~IFF_NO_PI;
#endif
}
}
if (Ioctl(sfd->fd, TUNSETIFF, &ifr) < 0) {
Error3("ioctl(%d, TUNSETIFF, {\"%s\"}: %s",
sfd->fd, ifr.ifr_name, strerror(errno));
Close(sfd->fd);
}
Notice1("TUN: new device \"%s\"", ifr.ifr_name);
/*===================== setting interface properties =====================*/
/* we seem to need a socket for manipulating the interface */
if ((sockfd = Socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
Error1("socket(PF_INET, SOCK_DGRAM, 0): %s", strerror(errno));
sockfd = sfd->fd; /* desperate fallback attempt */
}
/*--------------------- setting interface address and netmask ------------*/
if (argc == 2) {
if ((ifaddr = strdup(argv[1])) == NULL) {
Error1("strdup(\"%s\"): out of memory", argv[1]);
return STAT_RETRYLATER;
}
if ((result = xioparsenetwork(ifaddr, pf, &network,
sfd->para.socket.ip.ai_flags))
!= STAT_OK) {
/*! recover */
return result;
}
socket_init(pf, (union sockaddr_union *)&ifr.ifr_addr);
((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr =
network.netaddr.ip4.sin_addr;
if (Ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
Error4("ioctl(%d, SIOCSIFADDR, {\"%s\", \"%s\"}: %s",
sockfd, ifr.ifr_name, ifaddr, strerror(errno));
}
((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr =
network.netmask.ip4.sin_addr;
if (Ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
Error4("ioctl(%d, SIOCSIFNETMASK, {\"0x%08u\", \"%s\"}, %s",
sockfd, ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr,
ifaddr, strerror(errno));
}
free(ifaddr);
}
/*--------------------- setting interface flags --------------------------*/
applyopts_single(sfd, opts, PH_FD);
_xiointerface_apply_iff(sockfd, ifr.ifr_name, sfd->para.interface.iff_opts);
if (_interface_retrieve_vlan(&xfd->stream, opts) < 0)
return STAT_NORETRY;
if (ifindex(ifr.ifr_name, &ifidx, -1) < 0) {
Error1("unknown interface \"%s\"", ifr.ifr_name);
ifidx = 0; /* desparate attempt to continue */
}
#if HAVE_LINUX_RTNETLINK_H
if (retropt_uint(opts, OPT_INTERFACE_MTU, &mtu) == 0) {
xio_netlink_mtu(ifidx, mtu);
}
#endif /* HAVE_LINUX_RTNETLINK_H */
applyopts(sfd, -1, opts, PH_FD);
applyopts_cloexec(sfd->fd, opts);
applyopts_fchown(sfd->fd, opts);
if ((result = _xio_openlate(sfd, opts)) < 0)
return result;
return 0;
}
#endif /* WITH_TUN */
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