[secnet] / tun.c

#include "secnet.h"
#include "util.h"
#include "netlink.h"
#include <stdio.h>
#include <string.h>
#include <errno.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;
};

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)
{
    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)
{
    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,calculate_max_start_pad());
	l=read(st->fd,st->buff->start,st->buff->len-calculate_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;
    ssize_t rc;

    BUF_ASSERT_USED(buf);
    
    /* Log errors, so we can tell what's going on, but only once a
       minute, so we don't flood the logs.  Short writes count as
       errors. */
    rc = write(st->fd,buf->start,buf->size);
    if(rc != buf->size) {
	static struct timeval last_report;
	if(tv_now_global.tv_sec >= last_report.tv_sec + 60) {
	    if(rc < 0)
		Message(M_WARNING,
			"failed to deliver packet to tun device: %s\n",
			strerror(errno));
	    else
		Message(M_WARNING,
			"truncated packet delivered to tun device\n");
	    last_report = tv_now_global;
	}
    }
    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;
    bool_t up;

    if (routes->options & OPT_SOFTROUTE)
        up = routes->up;
    else
        up = routes->link_quality > LINK_QUALITY_UNUSED;

    if (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,up?"adding":"deleting",network,
		nets->list[i].len,up?"to":"from");
	switch (st->route_type) {
	case TUN_CONFIG_LINUX:
	    sys_cmd(st->route_path,"route",up?"add":"del",
		    "-net",network,"netmask",mask,
		    "gw",secnetaddr,(char *)0);
	    break;
	case TUN_CONFIG_BSD:
	    sys_cmd(st->route_path,"route",up?"add":"del",
		    "-net",network,secnetaddr,mask,(char *)0);
	    break;
	case TUN_CONFIG_SOLARIS25:
	    sys_cmd(st->route_path,"route",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;
	    
	    FILLZERO(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=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=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);
	}
	FILLZERO(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->nl.local_address);
    secnetaddr=ipaddr_to_string(st->nl.secnet_address);
    snprintf(mtu,sizeof(mtu),"%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;
	FILLZERO(*sa);
	sa->sin_family=AF_INET;
	sa->sin_addr.s_addr=htonl(st->nl.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;
	FILLZERO(*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;
	FILLZERO(*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);

    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) {
	    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>
090dbeef	6	#include <errno.h>
9d3a4132 SE	7	#include <unistd.h>
	8	#include <fcntl.h>
	9	#include <sys/ioctl.h>
ff05a229 SE	10	#include <sys/utsname.h>
ff05a229 SE	11	#include <sys/socket.h>
9d3a4132	12
ff05a229 SE	13	#ifdef HAVE_NET_IF_H
ff05a229 SE	14	#include <net/if.h>
9d3a4132	15	#ifdef HAVE_LINUX_IF_H
9d3a4132	16	#include <linux/if_tun.h>
ff05a229	17	#define LINUX_TUN_SUPPORTED
9d3a4132	18	#endif
ff05a229 SE	19	#endif
	20
	21	#ifdef HAVE_NET_ROUTE_H
	22	#include <net/route.h>
	23	#endif
	24
	25	#if defined(HAVE_STROPTS_H) && defined(HAVE_SYS_SOCKIO_H) && \
	26	defined(HAVE_NET_IF_TUN_H)
	27	#define HAVE_TUN_STREAMS
	28	#endif
	29
	30	#ifdef HAVE_TUN_STREAMS
	31	#include <stropts.h>
	32	#include <sys/sockio.h>
	33	#include <net/if_tun.h>
	34	#endif
	35
	36	#define TUN_FLAVOUR_GUESS 0
	37	#define TUN_FLAVOUR_BSD 1
	38	#define TUN_FLAVOUR_LINUX 2
	39	#define TUN_FLAVOUR_STREAMS 3
	40
	41	static struct flagstr flavours[]={
	42	{"guess", TUN_FLAVOUR_GUESS},
	43	{"bsd", TUN_FLAVOUR_BSD},
	44	{"BSD", TUN_FLAVOUR_BSD},
	45	{"linux", TUN_FLAVOUR_LINUX},
	46	{"streams", TUN_FLAVOUR_STREAMS},
	47	{"STREAMS", TUN_FLAVOUR_STREAMS},
	48	{NULL, 0}
	49	};
9d3a4132	50
ff05a229 SE	51	#define TUN_CONFIG_GUESS 0
	52	#define TUN_CONFIG_IOCTL 1
	53	#define TUN_CONFIG_BSD 2
	54	#define TUN_CONFIG_LINUX 3
	55	#define TUN_CONFIG_SOLARIS25 4
	56
	57	static struct flagstr config_types[]={
	58	{"guess", TUN_CONFIG_GUESS},
	59	{"ioctl", TUN_CONFIG_IOCTL},
	60	{"bsd", TUN_CONFIG_BSD},
	61	{"BSD", TUN_CONFIG_BSD},
	62	{"linux", TUN_CONFIG_LINUX},
	63	{"solaris-2.5", TUN_CONFIG_SOLARIS25},
	64	{NULL, 0}
	65	};
9d3a4132 SE	66
	67	/* Connection to the kernel through the universal TUN/TAP driver */
	68
	69	struct tun {
	70	struct netlink nl;
	71	int fd;
fe5e9cc4 SE	72	cstring_t device_path;
fe5e9cc4 SE	73	cstring_t ip_path;
9d3a4132	74	string_t interface_name;
fe5e9cc4	75	cstring_t ifconfig_path;
ff05a229	76	uint32_t ifconfig_type;
fe5e9cc4	77	cstring_t route_path;
ff05a229 SE	78	uint32_t route_type;
	79	uint32_t tun_flavour;
	80	bool_t search_for_if; /* Applies to tun-BSD only */
9d3a4132 SE	81	struct buffer_if buff; / We receive packets into here
	82	and send them to the netlink code. */
	83	netlink_deliver_fn *netlink_to_tunnel;
	84	};
	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	97	static int tun_beforepoll(void sst, struct pollfd fds, int *nfds_io,
90a39563	98	int *timeout_io)
9d3a4132 SE	99	{
	100	struct tun *st=sst;
	101	*nfds_io=1;
	102	fds[0].fd=st->fd;
fe5e9cc4	103	fds[0].events=POLLIN;
9d3a4132 SE	104	return 0;
	105	}
	106
90a39563	107	static void tun_afterpoll(void sst, struct pollfd fds, int nfds)
9d3a4132 SE	108	{
	109	struct tun *st=sst;
	110	int l;
	111
7138d0c5	112	if (nfds==0) return;
9d3a4132 SE	113	if (fds[0].revents&POLLERR) {
	114	printf("tun_afterpoll: hup!\n");
	115	}
	116	if (fds[0].revents&POLLIN) {
	117	BUF_ALLOC(st->buff,"tun_afterpoll");
3abd18e8 IJ	118	buffer_init(st->buff,calculate_max_start_pad());
3abd18e8 IJ	119	l=read(st->fd,st->buff->start,st->buff->len-calculate_max_start_pad());
9d3a4132 SE	120	if (l<0) {
	121	fatal_perror("tun_afterpoll: read()");
	122	}
	123	if (l==0) {
4f5e39ec	124	fatal("tun_afterpoll: read()=0; device gone away?");
9d3a4132 SE	125	}
	126	if (l>0) {
	127	st->buff->size=l;
469fd1d9	128	st->netlink_to_tunnel(&st->nl,st->buff);
9d3a4132 SE	129	BUF_ASSERT_FREE(st->buff);
	130	}
	131	}
	132	}
	133
469fd1d9	134	static void tun_deliver_to_kernel(void sst, struct buffer_if buf)
9d3a4132 SE	135	{
9d3a4132 SE	136	struct tun *st=sst;
090dbeef	137	ssize_t rc;
9d3a4132 SE	138
9d3a4132 SE	139	BUF_ASSERT_USED(buf);
090dbeef RK	140
	141	/* Log errors, so we can tell what's going on, but only once a
	142	minute, so we don't flood the logs. Short writes count as
	143	errors. */
	144	rc = write(st->fd,buf->start,buf->size);
	145	if(rc != buf->size) {
	146	static struct timeval last_report;
	147	if(tv_now_global.tv_sec >= last_report.tv_sec + 60) {
	148	if(rc < 0)
	149	Message(M_WARNING,
	150	"failed to deliver packet to tun device: %s\n",
	151	strerror(errno));
	152	else
	153	Message(M_WARNING,
	154	"truncated packet delivered to tun device\n");
	155	last_report = tv_now_global;
	156	}
	157	}
9d3a4132 SE	158	BUF_FREE(buf);
	159	}
	160
d3fe100d	161	static bool_t tun_set_route(void sst, struct netlink_client routes)
9d3a4132 SE	162	{
	163	struct tun *st=sst;
	164	string_t network, mask, secnetaddr;
d3fe100d	165	struct subnet_list *nets;
1caa23ff	166	int32_t i;
ff05a229	167	int fd=-1;
efacf9e0	168	bool_t up;
ff05a229	169
efacf9e0 ST	170	if (routes->options & OPT_SOFTROUTE)
	171	up = routes->up;
	172	else
	173	up = routes->link_quality > LINK_QUALITY_UNUSED;
	174
	175	if (up == routes->kup) return False;
ff05a229 SE	176	if (st->route_type==TUN_CONFIG_IOCTL) {
	177	if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	178	fd=open(st->ip_path,O_RDWR);
	179	if (fd<0) {
	180	fatal_perror("tun_set_route: can't open %s",st->ip_path);
	181	}
	182	} else {
	183	fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
	184	if (fd<0) {
	185	fatal_perror("tun_set_route: socket()");
	186	}
	187	}
	188	}
	189	nets=routes->subnets;
	190	secnetaddr=ipaddr_to_string(st->nl.secnet_address);
	191	for (i=0; i<nets->entries; i++) {
	192	network=ipaddr_to_string(nets->list[i].prefix);
	193	mask=ipaddr_to_string(nets->list[i].mask);
	194	Message(M_INFO,"%s: %s route %s/%d %s kernel routing table\n",
efacf9e0 ST	195	st->nl.name,up?"adding":"deleting",network,
efacf9e0 ST	196	nets->list[i].len,up?"to":"from");
ff05a229 SE	197	switch (st->route_type) {
ff05a229 SE	198	case TUN_CONFIG_LINUX:
efacf9e0	199	sys_cmd(st->route_path,"route",up?"add":"del",
ff05a229 SE	200	"-net",network,"netmask",mask,
	201	"gw",secnetaddr,(char *)0);
	202	break;
	203	case TUN_CONFIG_BSD:
efacf9e0	204	sys_cmd(st->route_path,"route",up?"add":"del",
ff05a229 SE	205	"-net",network,secnetaddr,mask,(char *)0);
	206	break;
	207	case TUN_CONFIG_SOLARIS25:
efacf9e0	208	sys_cmd(st->route_path,"route",up?"add":"del",
ff05a229 SE	209	network,secnetaddr,(char *)0);
	210	break;
	211	case TUN_CONFIG_IOCTL:
	212	{
ea7ec970 SE	213	/* darwin rtentry has a different format, use /sbin/route instead */
ea7ec970 SE	214	#if HAVE_NET_ROUTE_H && ! __APPLE__
ff05a229 SE	215	struct rtentry rt;
	216	struct sockaddr_in *sa;
	217	int action;
	218
076bb54e	219	FILLZERO(rt);
ff05a229 SE	220	sa=(struct sockaddr_in *)&rt.rt_dst;
	221	sa->sin_family=AF_INET;
	222	sa->sin_addr.s_addr=htonl(nets->list[i].prefix);
	223	sa=(struct sockaddr_in *)&rt.rt_genmask;
	224	sa->sin_family=AF_INET;
	225	sa->sin_addr.s_addr=htonl(nets->list[i].mask);
	226	sa=(struct sockaddr_in *)&rt.rt_gateway;
	227	sa->sin_family=AF_INET;
	228	sa->sin_addr.s_addr=htonl(st->nl.secnet_address);
	229	rt.rt_flags=RTF_UP\|RTF_GATEWAY;
efacf9e0	230	action=up?SIOCADDRT:SIOCDELRT;
ff05a229 SE	231	if (ioctl(fd,action,&rt)<0) {
	232	fatal_perror("tun_set_route: ioctl()");
	233	}
	234	#else
4f5e39ec	235	fatal("tun_set_route: ioctl method not supported");
ff05a229	236	#endif
d3fe100d	237	}
ff05a229 SE	238	break;
ff05a229 SE	239	default:
4f5e39ec	240	fatal("tun_set_route: unsupported route command type");
ff05a229 SE	241	break;
	242	}
	243	free(network); free(mask);
	244	}
	245	free(secnetaddr);
	246	if (st->route_type==TUN_CONFIG_IOCTL) {
	247	close(fd);
9d3a4132	248	}
efacf9e0	249	routes->kup=up;
ff05a229	250	return True;
9d3a4132 SE	251	}
	252
	253	static void tun_phase_hook(void *sst, uint32_t newphase)
	254	{
	255	struct tun *st=sst;
	256	string_t hostaddr,secnetaddr;
7c006408	257	char mtu[6];
d3fe100d	258	struct netlink_client *r;
9d3a4132	259
ff05a229	260	if (st->tun_flavour==TUN_FLAVOUR_BSD) {
9d3a4132 SE	261	if (st->search_for_if) {
	262	string_t dname;
	263	int i;
	264
9d3a4132 SE	265	dname=safe_malloc(strlen(st->device_path)+4,"tun_old_apply");
	266	st->interface_name=safe_malloc(8,"tun_phase_hook");
	267
	268	for (i=0; i<255; i++) {
	269	sprintf(dname,"%s%d",st->device_path,i);
	270	if ((st->fd=open(dname,O_RDWR))>0) {
	271	sprintf(st->interface_name,"tun%d",i);
	272	Message(M_INFO,"%s: allocated network interface %s "
	273	"through %s\n",st->nl.name,st->interface_name,
	274	dname);
	275	break;
	276	}
	277	}
	278	if (st->fd==-1) {
4f5e39ec	279	fatal("%s: unable to open any TUN device (%s...)",
9d3a4132 SE	280	st->nl.name,st->device_path);
	281	}
	282	} else {
	283	st->fd=open(st->device_path,O_RDWR);
	284	if (st->fd==-1) {
	285	fatal_perror("%s: unable to open TUN device file %s",
	286	st->nl.name,st->device_path);
	287	}
	288	}
ff05a229 SE	289	} else if (st->tun_flavour==TUN_FLAVOUR_LINUX) {
ff05a229 SE	290	#ifdef LINUX_TUN_SUPPORTED
9d3a4132 SE	291	struct ifreq ifr;
	292
	293	/* New TUN interface: open the device, then do ioctl TUNSETIFF
	294	to set or find out the network interface name. */
	295	st->fd=open(st->device_path,O_RDWR);
	296	if (st->fd==-1) {
	297	fatal_perror("%s: can't open device file %s",st->nl.name,
	298	st->device_path);
	299	}
076bb54e	300	FILLZERO(ifr);
9d3a4132 SE	301	ifr.ifr_flags = IFF_TUN \| IFF_NO_PI; /* Just send/receive IP packets,
	302	no extra headers */
	303	if (st->interface_name)
	304	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
9d3a4132 SE	305	if (ioctl(st->fd,TUNSETIFF,&ifr)<0) {
	306	fatal_perror("%s: ioctl(TUNSETIFF)",st->nl.name);
	307	}
	308	if (!st->interface_name) {
	309	st->interface_name=safe_malloc(strlen(ifr.ifr_name)+1,"tun_apply");
	310	strcpy(st->interface_name,ifr.ifr_name);
	311	Message(M_INFO,"%s: allocated network interface %s\n",st->nl.name,
	312	st->interface_name);
	313	}
	314	#else
4f5e39ec	315	fatal("tun_phase_hook: TUN_FLAVOUR_LINUX unexpected");
ff05a229 SE	316	#endif /* LINUX_TUN_SUPPORTED */
	317	} else if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	318	#ifdef HAVE_TUN_STREAMS
	319	int tun_fd, if_fd, ppa=-1, ip_fd;
	320
	321	if ((ip_fd=open(st->ip_path, O_RDWR)) < 0) {
	322	fatal_perror("%s: can't open %s",st->nl.name,st->ip_path);
	323	}
	324	if ((tun_fd=open(st->device_path,O_RDWR)) < 0) {
	325	fatal_perror("%s: can't open %s",st->nl.name,st->device_path);
	326	}
	327	if ((ppa=ioctl(tun_fd,TUNNEWPPA,ppa)) < 0) {
	328	fatal_perror("%s: can't assign new interface");
	329	}
	330	if ((if_fd=open(st->device_path,O_RDWR)) < 0) {
	331	fatal_perror("%s: can't open %s (2)",st->nl.name,st->device_path);
	332	}
	333	if (ioctl(if_fd,I_PUSH,"ip") < 0) {
	334	fatal_perror("%s: can't push IP module",st->nl.name);
	335	}
	336	if (ioctl(if_fd,IF_UNITSEL,(char *)&ppa) < 0) {
	337	fatal_perror("%s: can't set ppa %d",st->nl.name,ppa);
	338	}
	339	if (ioctl(ip_fd, I_LINK, if_fd) < 0) {
	340	fatal_perror("%s: can't link TUN device to IP",st->nl.name);
	341	}
	342	st->interface_name=safe_malloc(10,"tun_apply");
	343	sprintf(st->interface_name,"tun%d",ppa);
	344	st->fd=tun_fd;
	345	#else
4f5e39ec	346	fatal("tun_phase_hook: TUN_FLAVOUR_STREAMS unexpected");
ff05a229 SE	347	#endif /* HAVE_TUN_STREAMS */
ff05a229 SE	348	} else {
4f5e39ec	349	fatal("tun_phase_hook: unknown flavour of TUN");
9d3a4132 SE	350	}
	351	/* All the networks we'll be using have been registered. Invoke ifconfig
	352	to set the TUN device's address, and route to add routes to all
	353	our networks. */
	354
091433c6	355	hostaddr=ipaddr_to_string(st->nl.local_address);
9d3a4132	356	secnetaddr=ipaddr_to_string(st->nl.secnet_address);
c1d2109a	357	snprintf(mtu,sizeof(mtu),"%d",st->nl.mtu);
9d3a4132 SE	358	mtu[5]=0;
9d3a4132 SE	359
fe5e9cc4	360	switch (st->ifconfig_type) {
ff05a229 SE	361	case TUN_CONFIG_LINUX:
	362	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
	363	hostaddr,"netmask","255.255.255.255","-broadcast",
	364	"-multicast",
	365	"pointopoint",secnetaddr,"mtu",mtu,"up",(char *)0);
	366	break;
	367	case TUN_CONFIG_BSD:
	368	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
	369	hostaddr,"netmask","255.255.255.255",
	370	secnetaddr,"mtu",mtu,"up",(char *)0);
	371	break;
	372	case TUN_CONFIG_SOLARIS25:
	373	sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name,
	374	hostaddr,secnetaddr,"mtu",mtu,"up",(char *)0);
	375	break;
	376	case TUN_CONFIG_IOCTL:
ea7ec970	377	#if HAVE_NET_IF_H && ! __APPLE__
ff05a229 SE	378	{
	379	int fd;
	380	struct ifreq ifr;
	381	struct sockaddr_in *sa;
	382	fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
	383
	384	/* Interface address */
	385	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	386	sa=(struct sockaddr_in *)&ifr.ifr_addr;
076bb54e	387	FILLZERO(*sa);
ff05a229	388	sa->sin_family=AF_INET;
091433c6	389	sa->sin_addr.s_addr=htonl(st->nl.local_address);
ff05a229 SE	390	if (ioctl(fd,SIOCSIFADDR, &ifr)!=0) {
	391	fatal_perror("tun_apply: SIOCSIFADDR");
	392	}
	393	#ifdef SIOCSIFNETMASK
	394	/* Netmask */
	395	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	396	sa=(struct sockaddr_in *)&ifr.ifr_netmask;
076bb54e	397	FILLZERO(*sa);
ff05a229 SE	398	sa->sin_family=AF_INET;
	399	sa->sin_addr.s_addr=htonl(0xffffffff);
	400	if (ioctl(fd,SIOCSIFNETMASK, &ifr)!=0) {
	401	fatal_perror("tun_apply: SIOCSIFNETMASK");
	402	}
	403	#endif
	404	/* Destination address (point-to-point) */
	405	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	406	sa=(struct sockaddr_in *)&ifr.ifr_dstaddr;
076bb54e	407	FILLZERO(*sa);
ff05a229 SE	408	sa->sin_family=AF_INET;
	409	sa->sin_addr.s_addr=htonl(st->nl.secnet_address);
	410	if (ioctl(fd,SIOCSIFDSTADDR, &ifr)!=0) {
	411	fatal_perror("tun_apply: SIOCSIFDSTADDR");
	412	}
	413	/* MTU */
	414	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	415	ifr.ifr_mtu=st->nl.mtu;
	416	if (ioctl(fd,SIOCSIFMTU, &ifr)!=0) {
	417	fatal_perror("tun_apply: SIOCSIFMTU");
	418	}
	419	/* Flags */
	420	strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ);
	421	ifr.ifr_flags=IFF_UP\|IFF_POINTOPOINT\|IFF_RUNNING\|IFF_NOARP;
	422	if (ioctl(fd,SIOCSIFFLAGS, &ifr)!=0) {
	423	fatal_perror("tun_apply: SIOCSIFFLAGS");
	424	}
9d3a4132	425
ff05a229 SE	426	close(fd);
	427	}
	428	#else
4f5e39ec	429	fatal("tun_apply: ifconfig by ioctl() not supported");
ff05a229 SE	430	#endif /* HAVE_NET_IF_H */
	431	break;
	432	default:
4f5e39ec	433	fatal("tun_apply: unsupported ifconfig method");
ff05a229 SE	434	break;
	435	}
	436
d3fe100d SE	437	for (r=st->nl.clients; r; r=r->next) {
d3fe100d SE	438	tun_set_route(st,r);
9d3a4132 SE	439	}
	440
	441	/* Register for poll() */
	442	register_for_poll(st, tun_beforepoll, tun_afterpoll, 1, st->nl.name);
	443	}
	444
ff05a229 SE	445	static list_t tun_create(closure_t self, struct cloc loc, dict_t *context,
ff05a229 SE	446	list_t *args,uint32_t default_flavour)
9d3a4132 SE	447	{
	448	struct tun *st;
	449	item_t *item;
	450	dict_t *dict;
ff05a229	451	string_t flavour,type;
9d3a4132 SE	452
	453	st=safe_malloc(sizeof(*st),"tun_apply");
	454
	455	/* First parameter must be a dict */
	456	item=list_elem(args,0);
	457	if (!item \|\| item->type!=t_dict)
	458	cfgfatal(loc,"tun","parameter must be a dictionary\n");
	459
	460	dict=item->data.dict;
	461
	462	st->netlink_to_tunnel=
	463	netlink_init(&st->nl,st,loc,dict,
	464	"netlink-tun",tun_set_route,tun_deliver_to_kernel);
	465
ff05a229 SE	466	flavour=dict_read_string(dict,"flavour",False,"tun-netlink",loc);
	467	if (flavour)
	468	st->tun_flavour=string_to_word(flavour,loc,flavours,"tun-flavour");
	469	else
	470	st->tun_flavour=default_flavour;
	471
9d3a4132	472	st->device_path=dict_read_string(dict,"device",False,"tun-netlink",loc);
ff05a229	473	st->ip_path=dict_read_string(dict,"ip-path",False,"tun-netlink",loc);
9d3a4132 SE	474	st->interface_name=dict_read_string(dict,"interface",False,
9d3a4132 SE	475	"tun-netlink",loc);
ff05a229 SE	476	st->search_for_if=dict_read_bool(dict,"interface-search",False,
	477	"tun-netlink",loc,st->device_path==NULL);
	478
	479	type=dict_read_string(dict,"ifconfig-type",False,"tun-netlink",loc);
	480	if (type) st->ifconfig_type=string_to_word(type,loc,config_types,
	481	"ifconfig-type");
	482	else st->ifconfig_type=TUN_CONFIG_GUESS;
	483	st->ifconfig_path=dict_read_string(dict,"ifconfig-path",False,
	484	"tun-netlink",loc);
	485
	486	type=dict_read_string(dict,"route-type",False,"tun-netlink",loc);
	487	if (type) st->route_type=string_to_word(type,loc,config_types,
	488	"route-type");
	489	else st->route_type=TUN_CONFIG_GUESS;
	490	st->route_path=dict_read_string(dict,"route-path",False,"tun-netlink",loc);
9d3a4132	491
9d3a4132 SE	492	st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"tun-netlink",loc);
9d3a4132 SE	493
ff05a229 SE	494	if (st->tun_flavour==TUN_FLAVOUR_GUESS) {
	495	/* If we haven't been told what type of TUN we're using, take
	496	a guess based on the system details. */
	497	struct utsname u;
	498	if (uname(&u)<0) {
	499	fatal_perror("tun_create: uname");
	500	}
	501	if (strcmp(u.sysname,"Linux")==0) {
621c2861	502	st->tun_flavour=TUN_FLAVOUR_LINUX;
ff05a229 SE	503	} else if (strcmp(u.sysname,"SunOS")==0) {
ff05a229 SE	504	st->tun_flavour=TUN_FLAVOUR_STREAMS;
ea7ec970 SE	505	} else if (strcmp(u.sysname,"FreeBSD")==0
ea7ec970 SE	506	\|\| strcmp(u.sysname,"Darwin")==0) {
ff05a229 SE	507	st->tun_flavour=TUN_FLAVOUR_BSD;
	508	}
	509	}
	510	if (st->tun_flavour==TUN_FLAVOUR_GUESS) {
	511	cfgfatal(loc,"tun","cannot guess which type of TUN is in use; "
	512	"specify the flavour explicitly\n");
	513	}
9d3a4132	514
ff05a229 SE	515	if (st->ifconfig_type==TUN_CONFIG_GUESS) {
	516	switch (st->tun_flavour) {
	517	case TUN_FLAVOUR_LINUX:
	518	st->ifconfig_type=TUN_CONFIG_IOCTL;
	519	break;
	520	case TUN_FLAVOUR_BSD:
ea7ec970	521	#if __linux__
4f5e39ec SE	522	/* XXX on Linux we still want TUN_CONFIG_IOCTL. Perhaps we can
	523	use this on BSD too. */
	524	st->ifconfig_type=TUN_CONFIG_IOCTL;
ea7ec970 SE	525	#else
	526	st->ifconfig_type=TUN_CONFIG_BSD;
	527	#endif
ff05a229 SE	528	break;
	529	case TUN_FLAVOUR_STREAMS:
	530	st->ifconfig_type=TUN_CONFIG_BSD;
	531	break;
	532	}
	533	}
	534	if (st->route_type==TUN_CONFIG_GUESS)
	535	st->route_type=st->ifconfig_type;
9d3a4132	536
ff05a229 SE	537	if (st->ifconfig_type==TUN_CONFIG_GUESS) {
	538	cfgfatal(loc,"tun","cannot guess which ifconfig method to use\n");
	539	}
	540	if (st->route_type==TUN_CONFIG_GUESS) {
	541	cfgfatal(loc,"tun","cannot guess which route method to use\n");
	542	}
9d3a4132	543
ff05a229 SE	544	if (st->ifconfig_type==TUN_CONFIG_IOCTL && st->ifconfig_path) {
	545	cfgfatal(loc,"tun","ifconfig-type \"ioctl\" is incompatible with "
	546	"ifconfig-path\n");
	547	}
	548	if (st->route_type==TUN_CONFIG_IOCTL && st->route_path) {
	549	cfgfatal(loc,"tun","route-type \"ioctl\" is incompatible with "
	550	"route-path\n");
	551	}
9d3a4132	552
ff05a229 SE	553	Message(M_DEBUG_CONFIG,"%s: tun flavour %s\n",st->nl.name,
	554	tun_flavour_str(st->tun_flavour));
	555	switch (st->tun_flavour) {
	556	case TUN_FLAVOUR_BSD:
	557	if (!st->device_path) st->device_path="/dev/tun";
	558	break;
	559	case TUN_FLAVOUR_LINUX:
	560	if (!st->device_path) st->device_path="/dev/net/tun";
	561	break;
	562	case TUN_FLAVOUR_STREAMS:
	563	if (!st->device_path) st->device_path="/dev/tun";
	564	if (st->interface_name) cfgfatal(loc,"tun","interface name cannot "
	565	"be specified with STREAMS TUN\n");
	566	break;
	567	}
9d3a4132	568
ff05a229	569	if (!st->ip_path) st->ip_path="/dev/ip";
9d3a4132 SE	570	if (!st->ifconfig_path) st->ifconfig_path="ifconfig";
9d3a4132 SE	571	if (!st->route_path) st->route_path="route";
ff05a229 SE	572
	573	#ifndef HAVE_TUN_STREAMS
	574	if (st->tun_flavour==TUN_FLAVOUR_STREAMS) {
	575	cfgfatal(loc,"tun","TUN flavour STREAMS unsupported in this build "
	576	"of secnet\n");
	577	}
	578	#endif
	579	#ifndef LINUX_TUN_SUPPORTED
	580	if (st->tun_flavour==TUN_FLAVOUR_LINUX) {
	581	cfgfatal(loc,"tun","TUN flavour LINUX unsupported in this build "
	582	"of secnet\n");
	583	}
	584	#endif
9d3a4132 SE	585
	586	/* Old TUN interface: the network interface name depends on which
	587	/dev/tunX file we open. If 'interface-search' is set to true, treat
	588	'device' as the prefix and try numbers from 0--255. If it's set
	589	to false, treat 'device' as the whole name, and require than an
	590	appropriate interface name be specified. */
ff05a229 SE	591	if (st->tun_flavour==TUN_FLAVOUR_BSD) {
	592	if (st->search_for_if && st->interface_name) {
	593	cfgfatal(loc,"tun","you may not specify an interface name "
	594	"in interface-search mode\n");
	595	}
	596	if (!st->search_for_if && !st->interface_name) {
	597	cfgfatal(loc,"tun","you must specify an interface name "
	598	"when you explicitly specify a TUN device file\n");
	599	}
9d3a4132 SE	600	}
9d3a4132 SE	601
9d3a4132 SE	602	add_hook(PHASE_GETRESOURCES,tun_phase_hook,st);
	603
	604	return new_closure(&st->nl.cl);
	605	}
	606
ff05a229 SE	607	static list_t tun_apply(closure_t self, struct cloc loc, dict_t *context,
	608	list_t *args)
	609	{
	610	return tun_create(self,loc,context,args,TUN_FLAVOUR_GUESS);
	611	}
	612
	613	static list_t tun_bsd_apply(closure_t self, struct cloc loc, dict_t *context,
	614	list_t *args)
	615	{
	616	Message(M_WARNING,"(%s,%d): obsolete use of tun-old; replace with tun "
	617	"and specify flavour \"bsd\".\n",loc.file,loc.line);
	618	return tun_create(self,loc,context,args,TUN_FLAVOUR_BSD);
	619	}
	620
9d3a4132 SE	621	void tun_module(dict_t *dict)
9d3a4132 SE	622	{
9d3a4132	623	add_closure(dict,"tun",tun_apply);
ff05a229	624	add_closure(dict,"tun-old",tun_bsd_apply);
9d3a4132	625	}