[secnet] / tun.c

#include "secnet.h"
#include "util.h"
#include "netlink.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <sys/socket.h>

#ifdef HAVE_NET_IF_H
#include <net/if.h>
#ifdef HAVE_LINUX_IF_H
#include <linux/if_tun.h>
#define LINUX_TUN_SUPPORTED
#endif
#endif

#ifdef HAVE_NET_ROUTE_H
#include <net/route.h>
#endif

#if defined(HAVE_STROPTS_H) && defined(HAVE_SYS_SOCKIO_H) && \
defined(HAVE_NET_IF_TUN_H)
#define HAVE_TUN_STREAMS
#endif

#ifdef HAVE_TUN_STREAMS
#include <stropts.h>
#include <sys/sockio.h>
#include <net/if_tun.h>
#endif

#define TUN_FLAVOUR_GUESS   0
#define TUN_FLAVOUR_BSD     1
#define TUN_FLAVOUR_LINUX   2
#define TUN_FLAVOUR_STREAMS 3

static struct flagstr flavours[]={
    {"guess", TUN_FLAVOUR_GUESS},
    {"bsd", TUN_FLAVOUR_BSD},
    {"BSD", TUN_FLAVOUR_BSD},
    {"linux", TUN_FLAVOUR_LINUX},
    {"streams", TUN_FLAVOUR_STREAMS},
    {"STREAMS", TUN_FLAVOUR_STREAMS},
    {NULL, 0}
};

#define TUN_CONFIG_GUESS      0
#define TUN_CONFIG_IOCTL      1
#define TUN_CONFIG_BSD        2
#define TUN_CONFIG_LINUX      3
#define TUN_CONFIG_SOLARIS25  4

static struct flagstr config_types[]={
    {"guess", TUN_CONFIG_GUESS},
    {"ioctl", TUN_CONFIG_IOCTL},
    {"bsd", TUN_CONFIG_BSD},
    {"BSD", TUN_CONFIG_BSD},
    {"linux", TUN_CONFIG_LINUX},
    {"solaris-2.5", TUN_CONFIG_SOLARIS25},
    {NULL, 0}
};

/* Connection to the kernel through the universal TUN/TAP driver */

struct tun {
    struct netlink nl;
    int fd;
    cstring_t device_path;
    cstring_t ip_path;
    string_t interface_name;
    cstring_t ifconfig_path;
    uint32_t ifconfig_type;
    cstring_t route_path;
    uint32_t route_type;
    uint32_t tun_flavour;
    bool_t search_for_if; /* Applies to tun-BSD only */
    struct buffer_if *buff; /* We receive packets into here
			       and send them to the netlink code. */
    netlink_deliver_fn *netlink_to_tunnel;
    uint32_t local_address; /* host interface address */
};

static cstring_t tun_flavour_str(uint32_t flavour)
{
    switch (flavour) {
    case TUN_FLAVOUR_GUESS: return "guess";
    case TUN_FLAVOUR_BSD: return "BSD";
    case TUN_FLAVOUR_LINUX: return "linux";
    case TUN_FLAVOUR_STREAMS: return "STREAMS";
    default: return "unknown";
    }
}

static int tun_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
			  int *timeout_io, const struct timeval *tv_now,
			  uint64_t *now)
{
    struct tun *st=sst;
    *nfds_io=1;
    fds[0].fd=st->fd;
    fds[0].events=POLLIN;
    return 0;
}

static void tun_afterpoll(void *sst, struct pollfd *fds, int nfds,
			  const struct timeval *tv_now, uint64_t *now)
{
    struct tun *st=sst;
    int l;

    if (nfds==0) return;
    if (fds[0].revents&POLLERR) {
	printf("tun_afterpoll: hup!\n");
    }
    if (fds[0].revents&POLLIN) {
	BUF_ALLOC(st->buff,"tun_afterpoll");
	buffer_init(st->buff,st->nl.max_start_pad);
	l=read(st->fd,st->buff->start,st->buff->len-st->nl.max_start_pad);
	if (l<0) {
	    fatal_perror("tun_afterpoll: read()");
	}
	if (l==0) {
	    fatal("tun_afterpoll: read()=0; device gone away?");
	}
	if (l>0) {
	    st->buff->size=l;
	    st->netlink_to_tunnel(&st->nl,st->buff);
	    BUF_ASSERT_FREE(st->buff);
	}
    }
}

static void tun_deliver_to_kernel(void *sst, struct buffer_if *buf)
{
    struct tun *st=sst;

    BUF_ASSERT_USED(buf);
    /* No error checking, because we'd just throw the packet away
       anyway if it didn't work. */
    write(st->fd,buf->start,buf->size);
    BUF_FREE(buf);
}

static bool_t tun_set_route(void *sst, struct netlink_client *routes)
{
    struct tun *st=sst;
    string_t network, mask, secnetaddr;
    struct subnet_list *nets;
    int32_t i;
    int fd=-1;

    if (routes->up == routes->kup) return False;
    if (st->route_type==TUN_CONFIG_IOCTL) {
	if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	    fd=open(st->ip_path,O_RDWR);
	    if (fd<0) {
		fatal_perror("tun_set_route: can't open %s",st->ip_path);
	    }
	} else {
	    fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
	    if (fd<0) {
		fatal_perror("tun_set_route: socket()");
	    }
	}
    }
    nets=routes->subnets;
    secnetaddr=ipaddr_to_string(st->nl.secnet_address);
    for (i=0; i<nets->entries; i++) {
	network=ipaddr_to_string(nets->list[i].prefix);
	mask=ipaddr_to_string(nets->list[i].mask);
	Message(M_INFO,"%s: %s route %s/%d %s kernel routing table\n",
		st->nl.name,routes->up?"adding":"deleting",network,
		nets->list[i].len,routes->up?"to":"from");
	switch (st->route_type) {
	case TUN_CONFIG_LINUX:
	    sys_cmd(st->route_path,"route",routes->up?"add":"del",
		    "-net",network,"netmask",mask,
		    "gw",secnetaddr,(char *)0);
	    break;
	case TUN_CONFIG_BSD:
	    sys_cmd(st->route_path,"route",routes->up?"add":"del",
		    "-net",network,secnetaddr,mask,(char *)0);
	    break;
	case TUN_CONFIG_SOLARIS25:
	    sys_cmd(st->route_path,"route",routes->up?"add":"del",
		    network,secnetaddr,(char *)0);
	    break;
	case TUN_CONFIG_IOCTL:
	{
	  /* darwin rtentry has a different format, use /sbin/route instead */
#if HAVE_NET_ROUTE_H && ! __APPLE__
	    struct rtentry rt;
	    struct sockaddr_in *sa;
	    int action;
	    
	    memset(&rt,0,sizeof(rt));
	    sa=(struct sockaddr_in *)&rt.rt_dst;
	    sa->sin_family=AF_INET;
	    sa->sin_addr.s_addr=htonl(nets->list[i].prefix);
	    sa=(struct sockaddr_in *)&rt.rt_genmask;
	    sa->sin_family=AF_INET;
	    sa->sin_addr.s_addr=htonl(nets->list[i].mask);
	    sa=(struct sockaddr_in *)&rt.rt_gateway;
	    sa->sin_family=AF_INET;
	    sa->sin_addr.s_addr=htonl(st->nl.secnet_address);
	    rt.rt_flags=RTF_UP|RTF_GATEWAY;
	    action=routes->up?SIOCADDRT:SIOCDELRT;
	    if (ioctl(fd,action,&rt)<0) {
		fatal_perror("tun_set_route: ioctl()");
	    }
#else
	    fatal("tun_set_route: ioctl method not supported");
#endif
	}
	break;
	default:
	    fatal("tun_set_route: unsupported route command type");
	    break;
	}
	free(network); free(mask);
    }
    free(secnetaddr);
    if (st->route_type==TUN_CONFIG_IOCTL) {
	close(fd);
    }
    routes->kup=routes->up;
    return True;
}

static void tun_phase_hook(void *sst, uint32_t newphase)
{
    struct tun *st=sst;
    string_t hostaddr,secnetaddr;
    char mtu[6];
    struct netlink_client *r;

    if (st->tun_flavour==TUN_FLAVOUR_BSD) {
	if (st->search_for_if) {
	    string_t dname;
	    int i;

	    dname=safe_malloc(strlen(st->device_path)+4,"tun_old_apply");
	    st->interface_name=safe_malloc(8,"tun_phase_hook");
	
	    for (i=0; i<255; i++) {
		sprintf(dname,"%s%d",st->device_path,i);
		if ((st->fd=open(dname,O_RDWR))>0) {
		    sprintf(st->interface_name,"tun%d",i);
		    Message(M_INFO,"%s: allocated network interface %s "
			    "through %s\n",st->nl.name,st->interface_name,
			    dname);
		    break;
		}
	    }
	    if (st->fd==-1) {
		fatal("%s: unable to open any TUN device (%s...)",
		      st->nl.name,st->device_path);
	    }
	} else {
	    st->fd=open(st->device_path,O_RDWR);
	    if (st->fd==-1) {
		fatal_perror("%s: unable to open TUN device file %s",
			     st->nl.name,st->device_path);
	    }
	}
    } else if (st->tun_flavour==TUN_FLAVOUR_LINUX) {
#ifdef LINUX_TUN_SUPPORTED
	struct ifreq ifr;

	/* New TUN interface: open the device, then do ioctl TUNSETIFF
	   to set or find out the network interface name. */
	st->fd=open(st->device_path,O_RDWR);
	if (st->fd==-1) {
	    fatal_perror("%s: can't open device file %s",st->nl.name,
			 st->device_path);
	}
	memset(&ifr,0,sizeof(ifr));
	ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Just send/receive IP packets,
						no extra headers */
	if (st->interface_name)
	    strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	if (ioctl(st->fd,TUNSETIFF,&ifr)<0) {
	    fatal_perror("%s: ioctl(TUNSETIFF)",st->nl.name);
	}
	if (!st->interface_name) {
	    st->interface_name=safe_malloc(strlen(ifr.ifr_name)+1,"tun_apply");
	    strcpy(st->interface_name,ifr.ifr_name);
	    Message(M_INFO,"%s: allocated network interface %s\n",st->nl.name,
		    st->interface_name);
	}
#else
	fatal("tun_phase_hook: TUN_FLAVOUR_LINUX unexpected");
#endif /* LINUX_TUN_SUPPORTED */
    } else if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
#ifdef HAVE_TUN_STREAMS
	int tun_fd, if_fd, ppa=-1, ip_fd;

	if ((ip_fd=open(st->ip_path, O_RDWR)) < 0) {
	    fatal_perror("%s: can't open %s",st->nl.name,st->ip_path);
	}
	if ((tun_fd=open(st->device_path,O_RDWR)) < 0) {
	    fatal_perror("%s: can't open %s",st->nl.name,st->device_path);
	}
	if ((ppa=ioctl(tun_fd,TUNNEWPPA,ppa)) < 0) {
	    fatal_perror("%s: can't assign new interface");
	}
	if ((if_fd=open(st->device_path,O_RDWR)) < 0) {
	    fatal_perror("%s: can't open %s (2)",st->nl.name,st->device_path);
	}
	if (ioctl(if_fd,I_PUSH,"ip") < 0) {
	    fatal_perror("%s: can't push IP module",st->nl.name);
	}
	if (ioctl(if_fd,IF_UNITSEL,(char *)&ppa) < 0) {
	    fatal_perror("%s: can't set ppa %d",st->nl.name,ppa);
	}
	if (ioctl(ip_fd, I_LINK, if_fd) < 0) {
	    fatal_perror("%s: can't link TUN device to IP",st->nl.name);
	}
	st->interface_name=safe_malloc(10,"tun_apply");
	sprintf(st->interface_name,"tun%d",ppa);
	st->fd=tun_fd;
#else
	fatal("tun_phase_hook: TUN_FLAVOUR_STREAMS unexpected");
#endif /* HAVE_TUN_STREAMS */
    } else {
	fatal("tun_phase_hook: unknown flavour of TUN");
    }
    /* All the networks we'll be using have been registered. Invoke ifconfig
       to set the TUN device's address, and route to add routes to all
       our networks. */

    hostaddr=ipaddr_to_string(st->local_address);
    secnetaddr=ipaddr_to_string(st->nl.secnet_address);
    snprintf(mtu,6,"%d",st->nl.mtu);
    mtu[5]=0;

    switch (st->ifconfig_type) {
    case TUN_CONFIG_LINUX:
	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
		hostaddr,"netmask","255.255.255.255","-broadcast",
		"-multicast",
		"pointopoint",secnetaddr,"mtu",mtu,"up",(char *)0);
	break;
    case TUN_CONFIG_BSD:
	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
		hostaddr,"netmask","255.255.255.255",
		secnetaddr,"mtu",mtu,"up",(char *)0);
	break;
    case TUN_CONFIG_SOLARIS25:
	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
		hostaddr,secnetaddr,"mtu",mtu,"up",(char *)0);
	break;
    case TUN_CONFIG_IOCTL:
#if HAVE_NET_IF_H && ! __APPLE__
    {
	int fd;
	struct ifreq ifr;
	struct sockaddr_in *sa;
	fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);

	/* Interface address */
	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	sa=(struct sockaddr_in *)&ifr.ifr_addr;
	memset(sa,0,sizeof(*sa));
	sa->sin_family=AF_INET;
	sa->sin_addr.s_addr=htonl(st->local_address);
	if (ioctl(fd,SIOCSIFADDR, &ifr)!=0) {
	    fatal_perror("tun_apply: SIOCSIFADDR");
	}
#ifdef SIOCSIFNETMASK
	/* Netmask */
	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	sa=(struct sockaddr_in *)&ifr.ifr_netmask;
	memset(sa,0,sizeof(*sa));
	sa->sin_family=AF_INET;
	sa->sin_addr.s_addr=htonl(0xffffffff);
	if (ioctl(fd,SIOCSIFNETMASK, &ifr)!=0) {
	    fatal_perror("tun_apply: SIOCSIFNETMASK");
	}
#endif
	/* Destination address (point-to-point) */
	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	sa=(struct sockaddr_in *)&ifr.ifr_dstaddr;
	memset(sa,0,sizeof(*sa));
	sa->sin_family=AF_INET;
	sa->sin_addr.s_addr=htonl(st->nl.secnet_address);
	if (ioctl(fd,SIOCSIFDSTADDR, &ifr)!=0) {
	    fatal_perror("tun_apply: SIOCSIFDSTADDR");
	}
	/* MTU */
	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	ifr.ifr_mtu=st->nl.mtu;
	if (ioctl(fd,SIOCSIFMTU, &ifr)!=0) {
	    fatal_perror("tun_apply: SIOCSIFMTU");
	}
	/* Flags */
	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	ifr.ifr_flags=IFF_UP|IFF_POINTOPOINT|IFF_RUNNING|IFF_NOARP;
	if (ioctl(fd,SIOCSIFFLAGS, &ifr)!=0) {
	    fatal_perror("tun_apply: SIOCSIFFLAGS");
	}

	close(fd);
    }
#else
    fatal("tun_apply: ifconfig by ioctl() not supported");
#endif /* HAVE_NET_IF_H */
    break;
    default:
	fatal("tun_apply: unsupported ifconfig method");
	break;
    }
	
    for (r=st->nl.clients; r; r=r->next) {
	tun_set_route(st,r);
    }

    /* Register for poll() */
    register_for_poll(st, tun_beforepoll, tun_afterpoll, 1, st->nl.name);
}

static list_t *tun_create(closure_t *self, struct cloc loc, dict_t *context,
			  list_t *args,uint32_t default_flavour)
{
    struct tun *st;
    item_t *item;
    dict_t *dict;
    string_t flavour,type;

    st=safe_malloc(sizeof(*st),"tun_apply");

    /* First parameter must be a dict */
    item=list_elem(args,0);
    if (!item || item->type!=t_dict)
	cfgfatal(loc,"tun","parameter must be a dictionary\n");
    
    dict=item->data.dict;

    st->netlink_to_tunnel=
	netlink_init(&st->nl,st,loc,dict,
		     "netlink-tun",tun_set_route,tun_deliver_to_kernel);

    flavour=dict_read_string(dict,"flavour",False,"tun-netlink",loc);
    if (flavour)
	st->tun_flavour=string_to_word(flavour,loc,flavours,"tun-flavour");
    else
	st->tun_flavour=default_flavour;

    st->device_path=dict_read_string(dict,"device",False,"tun-netlink",loc);
    st->ip_path=dict_read_string(dict,"ip-path",False,"tun-netlink",loc);
    st->interface_name=dict_read_string(dict,"interface",False,
					"tun-netlink",loc);
    st->search_for_if=dict_read_bool(dict,"interface-search",False,
				     "tun-netlink",loc,st->device_path==NULL);

    type=dict_read_string(dict,"ifconfig-type",False,"tun-netlink",loc);
    if (type) st->ifconfig_type=string_to_word(type,loc,config_types,
					       "ifconfig-type");
    else st->ifconfig_type=TUN_CONFIG_GUESS;
    st->ifconfig_path=dict_read_string(dict,"ifconfig-path",False,
				       "tun-netlink",loc);

    type=dict_read_string(dict,"route-type",False,"tun-netlink",loc);
    if (type) st->route_type=string_to_word(type,loc,config_types,
					    "route-type");
    else st->route_type=TUN_CONFIG_GUESS;
    st->route_path=dict_read_string(dict,"route-path",False,"tun-netlink",loc);

    st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"tun-netlink",loc);
    st->local_address=string_item_to_ipaddr(
	dict_find_item(dict,"local-address", True, "netlink", loc),"netlink");

    if (st->tun_flavour==TUN_FLAVOUR_GUESS) {
	/* If we haven't been told what type of TUN we're using, take
	   a guess based on the system details. */
	struct utsname u;
	if (uname(&u)<0) {
	    fatal_perror("tun_create: uname");
	}
	if (strcmp(u.sysname,"Linux")==0) {
	    if (u.release[0]=='2' && u.release[1]=='.' && u.release[3]=='.') {
		if (u.release[2]=='2') st->tun_flavour=TUN_FLAVOUR_BSD;
		else if (u.release[2]=='4') st->tun_flavour=TUN_FLAVOUR_LINUX;
	    }
	} else if (strcmp(u.sysname,"SunOS")==0) {
	    st->tun_flavour=TUN_FLAVOUR_STREAMS;
	} else if (strcmp(u.sysname,"FreeBSD")==0
		   || strcmp(u.sysname,"Darwin")==0) {
	    st->tun_flavour=TUN_FLAVOUR_BSD;
	}
    }
    if (st->tun_flavour==TUN_FLAVOUR_GUESS) {
	cfgfatal(loc,"tun","cannot guess which type of TUN is in use; "
		 "specify the flavour explicitly\n");
    }

    if (st->ifconfig_type==TUN_CONFIG_GUESS) {
	switch (st->tun_flavour) {
	case TUN_FLAVOUR_LINUX:
	    st->ifconfig_type=TUN_CONFIG_IOCTL;
	    break;
	case TUN_FLAVOUR_BSD:
#if __linux__
	    /* XXX on Linux we still want TUN_CONFIG_IOCTL.  Perhaps we can
	       use this on BSD too. */
	    st->ifconfig_type=TUN_CONFIG_IOCTL;
#else	  
	    st->ifconfig_type=TUN_CONFIG_BSD;
#endif
	    break;
	case TUN_FLAVOUR_STREAMS:
	    st->ifconfig_type=TUN_CONFIG_BSD;
	    break;
	}
    }
    if (st->route_type==TUN_CONFIG_GUESS)
	st->route_type=st->ifconfig_type;

    if (st->ifconfig_type==TUN_CONFIG_GUESS) {
	cfgfatal(loc,"tun","cannot guess which ifconfig method to use\n");
    }
    if (st->route_type==TUN_CONFIG_GUESS) {
	cfgfatal(loc,"tun","cannot guess which route method to use\n");
    }

    if (st->ifconfig_type==TUN_CONFIG_IOCTL && st->ifconfig_path) {
	cfgfatal(loc,"tun","ifconfig-type \"ioctl\" is incompatible with "
		 "ifconfig-path\n");
    }
    if (st->route_type==TUN_CONFIG_IOCTL && st->route_path) {
	cfgfatal(loc,"tun","route-type \"ioctl\" is incompatible with "
		 "route-path\n");
    }

    Message(M_DEBUG_CONFIG,"%s: tun flavour %s\n",st->nl.name,
	    tun_flavour_str(st->tun_flavour));
    switch (st->tun_flavour) {
    case TUN_FLAVOUR_BSD:
	if (!st->device_path) st->device_path="/dev/tun";
	break;
    case TUN_FLAVOUR_LINUX:
	if (!st->device_path) st->device_path="/dev/net/tun";
	break;
    case TUN_FLAVOUR_STREAMS:
	if (!st->device_path) st->device_path="/dev/tun";
	if (st->interface_name) cfgfatal(loc,"tun","interface name cannot "
					 "be specified with STREAMS TUN\n");
	break;
    }
    
    if (!st->ip_path) st->ip_path="/dev/ip";
    if (!st->ifconfig_path) st->ifconfig_path="ifconfig";
    if (!st->route_path) st->route_path="route";

#ifndef HAVE_TUN_STREAMS
    if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	cfgfatal(loc,"tun","TUN flavour STREAMS unsupported in this build "
		 "of secnet\n");
    }
#endif
#ifndef LINUX_TUN_SUPPORTED
    if (st->tun_flavour==TUN_FLAVOUR_LINUX) {
	cfgfatal(loc,"tun","TUN flavour LINUX unsupported in this build "
		 "of secnet\n");
    }
#endif

    /* Old TUN interface: the network interface name depends on which
       /dev/tunX file we open. If 'interface-search' is set to true, treat
       'device' as the prefix and try numbers from 0--255. If it's set
       to false, treat 'device' as the whole name, and require than an
       appropriate interface name be specified. */
    if (st->tun_flavour==TUN_FLAVOUR_BSD) {
	if (st->search_for_if && st->interface_name) {
	    cfgfatal(loc,"tun","you may not specify an interface name "
		     "in interface-search mode\n");
	}
	if (!st->search_for_if && !st->interface_name) {
	    cfgfatal(loc,"tun","you must specify an interface name "
		     "when you explicitly specify a TUN device file\n");
	}
    }

    add_hook(PHASE_GETRESOURCES,tun_phase_hook,st);

    return new_closure(&st->nl.cl);
}

static list_t *tun_apply(closure_t *self, struct cloc loc, dict_t *context,
			 list_t *args)
{
    return tun_create(self,loc,context,args,TUN_FLAVOUR_GUESS);
}

static list_t *tun_bsd_apply(closure_t *self, struct cloc loc, dict_t *context,
			     list_t *args)
{
    Message(M_WARNING,"(%s,%d): obsolete use of tun-old; replace with tun "
	    "and specify flavour \"bsd\".\n",loc.file,loc.line);
    return tun_create(self,loc,context,args,TUN_FLAVOUR_BSD);
}

void tun_module(dict_t *dict)
{
    add_closure(dict,"tun",tun_apply);
    add_closure(dict,"tun-old",tun_bsd_apply);
}
Commit	Line	Data
9d3a4132 SE	1	#include "secnet.h"
	2	#include "util.h"
	3	#include "netlink.h"
	4	#include <stdio.h>
	5	#include <string.h>
	6	#include <unistd.h>
	7	#include <fcntl.h>
	8	#include <sys/ioctl.h>
ff05a229 SE	9	#include <sys/utsname.h>
ff05a229 SE	10	#include <sys/socket.h>
9d3a4132	11
ff05a229 SE	12	#ifdef HAVE_NET_IF_H
ff05a229 SE	13	#include <net/if.h>
9d3a4132	14	#ifdef HAVE_LINUX_IF_H
9d3a4132	15	#include <linux/if_tun.h>
ff05a229	16	#define LINUX_TUN_SUPPORTED
9d3a4132	17	#endif
ff05a229 SE	18	#endif
	19
	20	#ifdef HAVE_NET_ROUTE_H
	21	#include <net/route.h>
	22	#endif
	23
	24	#if defined(HAVE_STROPTS_H) && defined(HAVE_SYS_SOCKIO_H) && \
	25	defined(HAVE_NET_IF_TUN_H)
	26	#define HAVE_TUN_STREAMS
	27	#endif
	28
	29	#ifdef HAVE_TUN_STREAMS
	30	#include <stropts.h>
	31	#include <sys/sockio.h>
	32	#include <net/if_tun.h>
	33	#endif
	34
	35	#define TUN_FLAVOUR_GUESS 0
	36	#define TUN_FLAVOUR_BSD 1
	37	#define TUN_FLAVOUR_LINUX 2
	38	#define TUN_FLAVOUR_STREAMS 3
	39
	40	static struct flagstr flavours[]={
	41	{"guess", TUN_FLAVOUR_GUESS},
	42	{"bsd", TUN_FLAVOUR_BSD},
	43	{"BSD", TUN_FLAVOUR_BSD},
	44	{"linux", TUN_FLAVOUR_LINUX},
	45	{"streams", TUN_FLAVOUR_STREAMS},
	46	{"STREAMS", TUN_FLAVOUR_STREAMS},
	47	{NULL, 0}
	48	};
9d3a4132	49
ff05a229 SE	50	#define TUN_CONFIG_GUESS 0
	51	#define TUN_CONFIG_IOCTL 1
	52	#define TUN_CONFIG_BSD 2
	53	#define TUN_CONFIG_LINUX 3
	54	#define TUN_CONFIG_SOLARIS25 4
	55
	56	static struct flagstr config_types[]={
	57	{"guess", TUN_CONFIG_GUESS},
	58	{"ioctl", TUN_CONFIG_IOCTL},
	59	{"bsd", TUN_CONFIG_BSD},
	60	{"BSD", TUN_CONFIG_BSD},
	61	{"linux", TUN_CONFIG_LINUX},
	62	{"solaris-2.5", TUN_CONFIG_SOLARIS25},
	63	{NULL, 0}
	64	};
9d3a4132 SE	65
	66	/* Connection to the kernel through the universal TUN/TAP driver */
	67
	68	struct tun {
	69	struct netlink nl;
	70	int fd;
fe5e9cc4 SE	71	cstring_t device_path;
fe5e9cc4 SE	72	cstring_t ip_path;
9d3a4132	73	string_t interface_name;
fe5e9cc4	74	cstring_t ifconfig_path;
ff05a229	75	uint32_t ifconfig_type;
fe5e9cc4	76	cstring_t route_path;
ff05a229 SE	77	uint32_t route_type;
	78	uint32_t tun_flavour;
	79	bool_t search_for_if; /* Applies to tun-BSD only */
9d3a4132 SE	80	struct buffer_if buff; / We receive packets into here
	81	and send them to the netlink code. */
	82	netlink_deliver_fn *netlink_to_tunnel;
b2a56f7c	83	uint32_t local_address; /* host interface address */
9d3a4132 SE	84	};
9d3a4132 SE	85
fe5e9cc4	86	static cstring_t tun_flavour_str(uint32_t flavour)
ff05a229 SE	87	{
	88	switch (flavour) {
	89	case TUN_FLAVOUR_GUESS: return "guess";
	90	case TUN_FLAVOUR_BSD: return "BSD";
	91	case TUN_FLAVOUR_LINUX: return "linux";
	92	case TUN_FLAVOUR_STREAMS: return "STREAMS";
	93	default: return "unknown";
	94	}
	95	}
	96
9d3a4132 SE	97	static int tun_beforepoll(void sst, struct pollfd fds, int *nfds_io,
	98	int timeout_io, const struct timeval tv_now,
	99	uint64_t *now)
	100	{
	101	struct tun *st=sst;
	102	*nfds_io=1;
	103	fds[0].fd=st->fd;
fe5e9cc4	104	fds[0].events=POLLIN;
9d3a4132 SE	105	return 0;
	106	}
	107
	108	static void tun_afterpoll(void sst, struct pollfd fds, int nfds,
3b83c932	109	const struct timeval tv_now, uint64_t now)
9d3a4132 SE	110	{
	111	struct tun *st=sst;
	112	int l;
	113
7138d0c5	114	if (nfds==0) return;
9d3a4132 SE	115	if (fds[0].revents&POLLERR) {
	116	printf("tun_afterpoll: hup!\n");
	117	}
	118	if (fds[0].revents&POLLIN) {
	119	BUF_ALLOC(st->buff,"tun_afterpoll");
	120	buffer_init(st->buff,st->nl.max_start_pad);
	121	l=read(st->fd,st->buff->start,st->buff->len-st->nl.max_start_pad);
	122	if (l<0) {
	123	fatal_perror("tun_afterpoll: read()");
	124	}
	125	if (l==0) {
4f5e39ec	126	fatal("tun_afterpoll: read()=0; device gone away?");
9d3a4132 SE	127	}
	128	if (l>0) {
	129	st->buff->size=l;
469fd1d9	130	st->netlink_to_tunnel(&st->nl,st->buff);
9d3a4132 SE	131	BUF_ASSERT_FREE(st->buff);
	132	}
	133	}
	134	}
	135
469fd1d9	136	static void tun_deliver_to_kernel(void sst, struct buffer_if buf)
9d3a4132 SE	137	{
	138	struct tun *st=sst;
	139
	140	BUF_ASSERT_USED(buf);
c6f79b17 SE	141	/* No error checking, because we'd just throw the packet away
c6f79b17 SE	142	anyway if it didn't work. */
9d3a4132 SE	143	write(st->fd,buf->start,buf->size);
	144	BUF_FREE(buf);
	145	}
	146
d3fe100d	147	static bool_t tun_set_route(void sst, struct netlink_client routes)
9d3a4132 SE	148	{
	149	struct tun *st=sst;
	150	string_t network, mask, secnetaddr;
d3fe100d	151	struct subnet_list *nets;
1caa23ff	152	int32_t i;
ff05a229 SE	153	int fd=-1;
	154
	155	if (routes->up == routes->kup) return False;
	156	if (st->route_type==TUN_CONFIG_IOCTL) {
	157	if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	158	fd=open(st->ip_path,O_RDWR);
	159	if (fd<0) {
	160	fatal_perror("tun_set_route: can't open %s",st->ip_path);
	161	}
	162	} else {
	163	fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
	164	if (fd<0) {
	165	fatal_perror("tun_set_route: socket()");
	166	}
	167	}
	168	}
	169	nets=routes->subnets;
	170	secnetaddr=ipaddr_to_string(st->nl.secnet_address);
	171	for (i=0; i<nets->entries; i++) {
	172	network=ipaddr_to_string(nets->list[i].prefix);
	173	mask=ipaddr_to_string(nets->list[i].mask);
	174	Message(M_INFO,"%s: %s route %s/%d %s kernel routing table\n",
	175	st->nl.name,routes->up?"adding":"deleting",network,
	176	nets->list[i].len,routes->up?"to":"from");
	177	switch (st->route_type) {
	178	case TUN_CONFIG_LINUX:
	179	sys_cmd(st->route_path,"route",routes->up?"add":"del",
	180	"-net",network,"netmask",mask,
	181	"gw",secnetaddr,(char *)0);
	182	break;
	183	case TUN_CONFIG_BSD:
d3fe100d	184	sys_cmd(st->route_path,"route",routes->up?"add":"del",
ff05a229 SE	185	"-net",network,secnetaddr,mask,(char *)0);
	186	break;
	187	case TUN_CONFIG_SOLARIS25:
	188	sys_cmd(st->route_path,"route",routes->up?"add":"del",
	189	network,secnetaddr,(char *)0);
	190	break;
	191	case TUN_CONFIG_IOCTL:
	192	{
ea7ec970 SE	193	/* darwin rtentry has a different format, use /sbin/route instead */
ea7ec970 SE	194	#if HAVE_NET_ROUTE_H && ! __APPLE__
ff05a229 SE	195	struct rtentry rt;
	196	struct sockaddr_in *sa;
	197	int action;
	198
	199	memset(&rt,0,sizeof(rt));
	200	sa=(struct sockaddr_in *)&rt.rt_dst;
	201	sa->sin_family=AF_INET;
	202	sa->sin_addr.s_addr=htonl(nets->list[i].prefix);
	203	sa=(struct sockaddr_in *)&rt.rt_genmask;
	204	sa->sin_family=AF_INET;
	205	sa->sin_addr.s_addr=htonl(nets->list[i].mask);
	206	sa=(struct sockaddr_in *)&rt.rt_gateway;
	207	sa->sin_family=AF_INET;
	208	sa->sin_addr.s_addr=htonl(st->nl.secnet_address);
	209	rt.rt_flags=RTF_UP\|RTF_GATEWAY;
	210	action=routes->up?SIOCADDRT:SIOCDELRT;
	211	if (ioctl(fd,action,&rt)<0) {
	212	fatal_perror("tun_set_route: ioctl()");
	213	}
	214	#else
4f5e39ec	215	fatal("tun_set_route: ioctl method not supported");
ff05a229	216	#endif
d3fe100d	217	}
ff05a229 SE	218	break;
ff05a229 SE	219	default:
4f5e39ec	220	fatal("tun_set_route: unsupported route command type");
ff05a229 SE	221	break;
	222	}
	223	free(network); free(mask);
	224	}
	225	free(secnetaddr);
	226	if (st->route_type==TUN_CONFIG_IOCTL) {
	227	close(fd);
9d3a4132	228	}
ff05a229 SE	229	routes->kup=routes->up;
ff05a229 SE	230	return True;
9d3a4132 SE	231	}
	232
	233	static void tun_phase_hook(void *sst, uint32_t newphase)
	234	{
	235	struct tun *st=sst;
	236	string_t hostaddr,secnetaddr;
7c006408	237	char mtu[6];
d3fe100d	238	struct netlink_client *r;
9d3a4132	239
ff05a229	240	if (st->tun_flavour==TUN_FLAVOUR_BSD) {
9d3a4132 SE	241	if (st->search_for_if) {
	242	string_t dname;
	243	int i;
	244
9d3a4132 SE	245	dname=safe_malloc(strlen(st->device_path)+4,"tun_old_apply");
	246	st->interface_name=safe_malloc(8,"tun_phase_hook");
	247
	248	for (i=0; i<255; i++) {
	249	sprintf(dname,"%s%d",st->device_path,i);
	250	if ((st->fd=open(dname,O_RDWR))>0) {
	251	sprintf(st->interface_name,"tun%d",i);
	252	Message(M_INFO,"%s: allocated network interface %s "
	253	"through %s\n",st->nl.name,st->interface_name,
	254	dname);
	255	break;
	256	}
	257	}
	258	if (st->fd==-1) {
4f5e39ec	259	fatal("%s: unable to open any TUN device (%s...)",
9d3a4132 SE	260	st->nl.name,st->device_path);
	261	}
	262	} else {
	263	st->fd=open(st->device_path,O_RDWR);
	264	if (st->fd==-1) {
	265	fatal_perror("%s: unable to open TUN device file %s",
	266	st->nl.name,st->device_path);
	267	}
	268	}
ff05a229 SE	269	} else if (st->tun_flavour==TUN_FLAVOUR_LINUX) {
ff05a229 SE	270	#ifdef LINUX_TUN_SUPPORTED
9d3a4132 SE	271	struct ifreq ifr;
	272
	273	/* New TUN interface: open the device, then do ioctl TUNSETIFF
	274	to set or find out the network interface name. */
	275	st->fd=open(st->device_path,O_RDWR);
	276	if (st->fd==-1) {
	277	fatal_perror("%s: can't open device file %s",st->nl.name,
	278	st->device_path);
	279	}
	280	memset(&ifr,0,sizeof(ifr));
	281	ifr.ifr_flags = IFF_TUN \| IFF_NO_PI; /* Just send/receive IP packets,
	282	no extra headers */
	283	if (st->interface_name)
	284	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
9d3a4132 SE	285	if (ioctl(st->fd,TUNSETIFF,&ifr)<0) {
	286	fatal_perror("%s: ioctl(TUNSETIFF)",st->nl.name);
	287	}
	288	if (!st->interface_name) {
	289	st->interface_name=safe_malloc(strlen(ifr.ifr_name)+1,"tun_apply");
	290	strcpy(st->interface_name,ifr.ifr_name);
	291	Message(M_INFO,"%s: allocated network interface %s\n",st->nl.name,
	292	st->interface_name);
	293	}
	294	#else
4f5e39ec	295	fatal("tun_phase_hook: TUN_FLAVOUR_LINUX unexpected");
ff05a229 SE	296	#endif /* LINUX_TUN_SUPPORTED */
	297	} else if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	298	#ifdef HAVE_TUN_STREAMS
	299	int tun_fd, if_fd, ppa=-1, ip_fd;
	300
	301	if ((ip_fd=open(st->ip_path, O_RDWR)) < 0) {
	302	fatal_perror("%s: can't open %s",st->nl.name,st->ip_path);
	303	}
	304	if ((tun_fd=open(st->device_path,O_RDWR)) < 0) {
	305	fatal_perror("%s: can't open %s",st->nl.name,st->device_path);
	306	}
	307	if ((ppa=ioctl(tun_fd,TUNNEWPPA,ppa)) < 0) {
	308	fatal_perror("%s: can't assign new interface");
	309	}
	310	if ((if_fd=open(st->device_path,O_RDWR)) < 0) {
	311	fatal_perror("%s: can't open %s (2)",st->nl.name,st->device_path);
	312	}
	313	if (ioctl(if_fd,I_PUSH,"ip") < 0) {
	314	fatal_perror("%s: can't push IP module",st->nl.name);
	315	}
	316	if (ioctl(if_fd,IF_UNITSEL,(char *)&ppa) < 0) {
	317	fatal_perror("%s: can't set ppa %d",st->nl.name,ppa);
	318	}
	319	if (ioctl(ip_fd, I_LINK, if_fd) < 0) {
	320	fatal_perror("%s: can't link TUN device to IP",st->nl.name);
	321	}
	322	st->interface_name=safe_malloc(10,"tun_apply");
	323	sprintf(st->interface_name,"tun%d",ppa);
	324	st->fd=tun_fd;
	325	#else
4f5e39ec	326	fatal("tun_phase_hook: TUN_FLAVOUR_STREAMS unexpected");
ff05a229 SE	327	#endif /* HAVE_TUN_STREAMS */
ff05a229 SE	328	} else {
4f5e39ec	329	fatal("tun_phase_hook: unknown flavour of TUN");
9d3a4132 SE	330	}
	331	/* All the networks we'll be using have been registered. Invoke ifconfig
	332	to set the TUN device's address, and route to add routes to all
	333	our networks. */
	334
b2a56f7c	335	hostaddr=ipaddr_to_string(st->local_address);
9d3a4132 SE	336	secnetaddr=ipaddr_to_string(st->nl.secnet_address);
	337	snprintf(mtu,6,"%d",st->nl.mtu);
	338	mtu[5]=0;
	339
fe5e9cc4	340	switch (st->ifconfig_type) {
ff05a229 SE	341	case TUN_CONFIG_LINUX:
	342	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
	343	hostaddr,"netmask","255.255.255.255","-broadcast",
	344	"-multicast",
	345	"pointopoint",secnetaddr,"mtu",mtu,"up",(char *)0);
	346	break;
	347	case TUN_CONFIG_BSD:
	348	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
	349	hostaddr,"netmask","255.255.255.255",
	350	secnetaddr,"mtu",mtu,"up",(char *)0);
	351	break;
	352	case TUN_CONFIG_SOLARIS25:
	353	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
	354	hostaddr,secnetaddr,"mtu",mtu,"up",(char *)0);
	355	break;
	356	case TUN_CONFIG_IOCTL:
ea7ec970	357	#if HAVE_NET_IF_H && ! __APPLE__
ff05a229 SE	358	{
	359	int fd;
	360	struct ifreq ifr;
	361	struct sockaddr_in *sa;
	362	fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
	363
	364	/* Interface address */
	365	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	366	sa=(struct sockaddr_in *)&ifr.ifr_addr;
	367	memset(sa,0,sizeof(*sa));
	368	sa->sin_family=AF_INET;
	369	sa->sin_addr.s_addr=htonl(st->local_address);
	370	if (ioctl(fd,SIOCSIFADDR, &ifr)!=0) {
	371	fatal_perror("tun_apply: SIOCSIFADDR");
	372	}
	373	#ifdef SIOCSIFNETMASK
	374	/* Netmask */
	375	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	376	sa=(struct sockaddr_in *)&ifr.ifr_netmask;
	377	memset(sa,0,sizeof(*sa));
	378	sa->sin_family=AF_INET;
	379	sa->sin_addr.s_addr=htonl(0xffffffff);
	380	if (ioctl(fd,SIOCSIFNETMASK, &ifr)!=0) {
	381	fatal_perror("tun_apply: SIOCSIFNETMASK");
	382	}
	383	#endif
	384	/* Destination address (point-to-point) */
	385	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	386	sa=(struct sockaddr_in *)&ifr.ifr_dstaddr;
	387	memset(sa,0,sizeof(*sa));
	388	sa->sin_family=AF_INET;
	389	sa->sin_addr.s_addr=htonl(st->nl.secnet_address);
	390	if (ioctl(fd,SIOCSIFDSTADDR, &ifr)!=0) {
	391	fatal_perror("tun_apply: SIOCSIFDSTADDR");
	392	}
	393	/* MTU */
	394	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	395	ifr.ifr_mtu=st->nl.mtu;
	396	if (ioctl(fd,SIOCSIFMTU, &ifr)!=0) {
	397	fatal_perror("tun_apply: SIOCSIFMTU");
	398	}
	399	/* Flags */
	400	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	401	ifr.ifr_flags=IFF_UP\|IFF_POINTOPOINT\|IFF_RUNNING\|IFF_NOARP;
	402	if (ioctl(fd,SIOCSIFFLAGS, &ifr)!=0) {
	403	fatal_perror("tun_apply: SIOCSIFFLAGS");
	404	}
9d3a4132	405
ff05a229 SE	406	close(fd);
	407	}
	408	#else
4f5e39ec	409	fatal("tun_apply: ifconfig by ioctl() not supported");
ff05a229 SE	410	#endif /* HAVE_NET_IF_H */
	411	break;
	412	default:
4f5e39ec	413	fatal("tun_apply: unsupported ifconfig method");
ff05a229 SE	414	break;
	415	}
	416
d3fe100d SE	417	for (r=st->nl.clients; r; r=r->next) {
d3fe100d SE	418	tun_set_route(st,r);
9d3a4132 SE	419	}
	420
	421	/* Register for poll() */
	422	register_for_poll(st, tun_beforepoll, tun_afterpoll, 1, st->nl.name);
	423	}
	424
ff05a229 SE	425	static list_t tun_create(closure_t self, struct cloc loc, dict_t *context,
ff05a229 SE	426	list_t *args,uint32_t default_flavour)
9d3a4132 SE	427	{
	428	struct tun *st;
	429	item_t *item;
	430	dict_t *dict;
ff05a229	431	string_t flavour,type;
9d3a4132 SE	432
	433	st=safe_malloc(sizeof(*st),"tun_apply");
	434
	435	/* First parameter must be a dict */
	436	item=list_elem(args,0);
	437	if (!item \|\| item->type!=t_dict)
	438	cfgfatal(loc,"tun","parameter must be a dictionary\n");
	439
	440	dict=item->data.dict;
	441
	442	st->netlink_to_tunnel=
	443	netlink_init(&st->nl,st,loc,dict,
	444	"netlink-tun",tun_set_route,tun_deliver_to_kernel);
	445
ff05a229 SE	446	flavour=dict_read_string(dict,"flavour",False,"tun-netlink",loc);
	447	if (flavour)
	448	st->tun_flavour=string_to_word(flavour,loc,flavours,"tun-flavour");
	449	else
	450	st->tun_flavour=default_flavour;
	451
9d3a4132	452	st->device_path=dict_read_string(dict,"device",False,"tun-netlink",loc);
ff05a229	453	st->ip_path=dict_read_string(dict,"ip-path",False,"tun-netlink",loc);
9d3a4132 SE	454	st->interface_name=dict_read_string(dict,"interface",False,
9d3a4132 SE	455	"tun-netlink",loc);
ff05a229 SE	456	st->search_for_if=dict_read_bool(dict,"interface-search",False,
	457	"tun-netlink",loc,st->device_path==NULL);
	458
	459	type=dict_read_string(dict,"ifconfig-type",False,"tun-netlink",loc);
	460	if (type) st->ifconfig_type=string_to_word(type,loc,config_types,
	461	"ifconfig-type");
	462	else st->ifconfig_type=TUN_CONFIG_GUESS;
	463	st->ifconfig_path=dict_read_string(dict,"ifconfig-path",False,
	464	"tun-netlink",loc);
	465
	466	type=dict_read_string(dict,"route-type",False,"tun-netlink",loc);
	467	if (type) st->route_type=string_to_word(type,loc,config_types,
	468	"route-type");
	469	else st->route_type=TUN_CONFIG_GUESS;
	470	st->route_path=dict_read_string(dict,"route-path",False,"tun-netlink",loc);
9d3a4132	471
9d3a4132	472	st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"tun-netlink",loc);
794f2398	473	st->local_address=string_item_to_ipaddr(
b2a56f7c	474	dict_find_item(dict,"local-address", True, "netlink", loc),"netlink");
9d3a4132	475
ff05a229 SE	476	if (st->tun_flavour==TUN_FLAVOUR_GUESS) {
	477	/* If we haven't been told what type of TUN we're using, take
	478	a guess based on the system details. */
	479	struct utsname u;
	480	if (uname(&u)<0) {
	481	fatal_perror("tun_create: uname");
	482	}
	483	if (strcmp(u.sysname,"Linux")==0) {
	484	if (u.release[0]=='2' && u.release[1]=='.' && u.release[3]=='.') {
	485	if (u.release[2]=='2') st->tun_flavour=TUN_FLAVOUR_BSD;
	486	else if (u.release[2]=='4') st->tun_flavour=TUN_FLAVOUR_LINUX;
	487	}
	488	} else if (strcmp(u.sysname,"SunOS")==0) {
	489	st->tun_flavour=TUN_FLAVOUR_STREAMS;
ea7ec970 SE	490	} else if (strcmp(u.sysname,"FreeBSD")==0
ea7ec970 SE	491	\|\| strcmp(u.sysname,"Darwin")==0) {
ff05a229 SE	492	st->tun_flavour=TUN_FLAVOUR_BSD;
	493	}
	494	}
	495	if (st->tun_flavour==TUN_FLAVOUR_GUESS) {
	496	cfgfatal(loc,"tun","cannot guess which type of TUN is in use; "
	497	"specify the flavour explicitly\n");
	498	}
9d3a4132	499
ff05a229 SE	500	if (st->ifconfig_type==TUN_CONFIG_GUESS) {
	501	switch (st->tun_flavour) {
	502	case TUN_FLAVOUR_LINUX:
	503	st->ifconfig_type=TUN_CONFIG_IOCTL;
	504	break;
	505	case TUN_FLAVOUR_BSD:
ea7ec970	506	#if __linux__
4f5e39ec SE	507	/* XXX on Linux we still want TUN_CONFIG_IOCTL. Perhaps we can
	508	use this on BSD too. */
	509	st->ifconfig_type=TUN_CONFIG_IOCTL;
ea7ec970 SE	510	#else
	511	st->ifconfig_type=TUN_CONFIG_BSD;
	512	#endif
ff05a229 SE	513	break;
	514	case TUN_FLAVOUR_STREAMS:
	515	st->ifconfig_type=TUN_CONFIG_BSD;
	516	break;
	517	}
	518	}
	519	if (st->route_type==TUN_CONFIG_GUESS)
	520	st->route_type=st->ifconfig_type;
9d3a4132	521
ff05a229 SE	522	if (st->ifconfig_type==TUN_CONFIG_GUESS) {
	523	cfgfatal(loc,"tun","cannot guess which ifconfig method to use\n");
	524	}
	525	if (st->route_type==TUN_CONFIG_GUESS) {
	526	cfgfatal(loc,"tun","cannot guess which route method to use\n");
	527	}
9d3a4132	528
ff05a229 SE	529	if (st->ifconfig_type==TUN_CONFIG_IOCTL && st->ifconfig_path) {
	530	cfgfatal(loc,"tun","ifconfig-type \"ioctl\" is incompatible with "
	531	"ifconfig-path\n");
	532	}
	533	if (st->route_type==TUN_CONFIG_IOCTL && st->route_path) {
	534	cfgfatal(loc,"tun","route-type \"ioctl\" is incompatible with "
	535	"route-path\n");
	536	}
9d3a4132	537
ff05a229 SE	538	Message(M_DEBUG_CONFIG,"%s: tun flavour %s\n",st->nl.name,
	539	tun_flavour_str(st->tun_flavour));
	540	switch (st->tun_flavour) {
	541	case TUN_FLAVOUR_BSD:
	542	if (!st->device_path) st->device_path="/dev/tun";
	543	break;
	544	case TUN_FLAVOUR_LINUX:
	545	if (!st->device_path) st->device_path="/dev/net/tun";
	546	break;
	547	case TUN_FLAVOUR_STREAMS:
	548	if (!st->device_path) st->device_path="/dev/tun";
	549	if (st->interface_name) cfgfatal(loc,"tun","interface name cannot "
	550	"be specified with STREAMS TUN\n");
	551	break;
	552	}
9d3a4132	553
ff05a229	554	if (!st->ip_path) st->ip_path="/dev/ip";
9d3a4132 SE	555	if (!st->ifconfig_path) st->ifconfig_path="ifconfig";
9d3a4132 SE	556	if (!st->route_path) st->route_path="route";
ff05a229 SE	557
	558	#ifndef HAVE_TUN_STREAMS
	559	if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	560	cfgfatal(loc,"tun","TUN flavour STREAMS unsupported in this build "
	561	"of secnet\n");
	562	}
	563	#endif
	564	#ifndef LINUX_TUN_SUPPORTED
	565	if (st->tun_flavour==TUN_FLAVOUR_LINUX) {
	566	cfgfatal(loc,"tun","TUN flavour LINUX unsupported in this build "
	567	"of secnet\n");
	568	}
	569	#endif
9d3a4132 SE	570
	571	/* Old TUN interface: the network interface name depends on which
	572	/dev/tunX file we open. If 'interface-search' is set to true, treat
	573	'device' as the prefix and try numbers from 0--255. If it's set
	574	to false, treat 'device' as the whole name, and require than an
	575	appropriate interface name be specified. */
ff05a229 SE	576	if (st->tun_flavour==TUN_FLAVOUR_BSD) {
	577	if (st->search_for_if && st->interface_name) {
	578	cfgfatal(loc,"tun","you may not specify an interface name "
	579	"in interface-search mode\n");
	580	}
	581	if (!st->search_for_if && !st->interface_name) {
	582	cfgfatal(loc,"tun","you must specify an interface name "
	583	"when you explicitly specify a TUN device file\n");
	584	}
9d3a4132 SE	585	}
9d3a4132 SE	586
9d3a4132 SE	587	add_hook(PHASE_GETRESOURCES,tun_phase_hook,st);
	588
	589	return new_closure(&st->nl.cl);
	590	}
	591
ff05a229 SE	592	static list_t tun_apply(closure_t self, struct cloc loc, dict_t *context,
	593	list_t *args)
	594	{
	595	return tun_create(self,loc,context,args,TUN_FLAVOUR_GUESS);
	596	}
	597
	598	static list_t tun_bsd_apply(closure_t self, struct cloc loc, dict_t *context,
	599	list_t *args)
	600	{
	601	Message(M_WARNING,"(%s,%d): obsolete use of tun-old; replace with tun "
	602	"and specify flavour \"bsd\".\n",loc.file,loc.line);
	603	return tun_create(self,loc,context,args,TUN_FLAVOUR_BSD);
	604	}
	605
9d3a4132 SE	606	void tun_module(dict_t *dict)
9d3a4132 SE	607	{
9d3a4132	608	add_closure(dict,"tun",tun_apply);
ff05a229	609	add_closure(dict,"tun-old",tun_bsd_apply);
9d3a4132	610	}