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Date: Mon, 4 May 2009 07:38:13 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: David Woodhouse <dwmw2@...radead.org>
Cc: stephen.hemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [iproute2 patch]: Add 'ip tuntap' facility for managing tun/tap
devices
On Mon, 04 May 2009 11:42:58 +0100
David Woodhouse <dwmw2@...radead.org> wrote:
> This patch provides support for 'ip tuntap', allowing creation and
> deletion of persistent tun/tap devices.
>
> The support for _listing_ devices relies on the patch I just sent to
> netdev (<1241433136.6126.70.camel@...book.infradead.org>), although
> creation and deletion work without that patch.
>
> diff --git a/ip/Makefile b/ip/Makefile
> index 98ba876..e868f3e 100644
> --- a/ip/Makefile
> +++ b/ip/Makefile
> @@ -1,6 +1,6 @@
> IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o \
> rtm_map.o iptunnel.o ip6tunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \
> - ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o \
> + ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o iptuntap.o \
> ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o \
> iplink_vlan.o link_veth.o link_gre.o
>
> diff --git a/ip/ip.c b/ip/ip.c
> index 2bd54b2..d846a76 100644
> --- a/ip/ip.c
> +++ b/ip/ip.c
> @@ -47,7 +47,7 @@ static void usage(void)
> "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
> " ip [ -force ] -batch filename\n"
> "where OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |\n"
> -" tunnel | maddr | mroute | monitor | xfrm }\n"
> +" tunnel | tuntap | maddr | mroute | monitor | xfrm }\n"
> " OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
> " -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
> " -o[neline] | -t[imestamp] | -b[atch] [filename] }\n");
> @@ -75,6 +75,8 @@ static const struct cmd {
> { "link", do_iplink },
> { "tunnel", do_iptunnel },
> { "tunl", do_iptunnel },
> + { "tuntap", do_iptuntap },
> + { "tap", do_iptuntap },
> { "monitor", do_ipmonitor },
> { "xfrm", do_xfrm },
> { "mroute", do_multiroute },
> diff --git a/ip/ip_common.h b/ip/ip_common.h
> index 273065f..c857667 100644
> --- a/ip/ip_common.h
> +++ b/ip/ip_common.h
> @@ -32,6 +32,7 @@ extern int do_ipneigh(int argc, char **argv);
> extern int do_ipntable(int argc, char **argv);
> extern int do_iptunnel(int argc, char **argv);
> extern int do_ip6tunnel(int argc, char **argv);
> +extern int do_iptuntap(int argc, char **argv);
> extern int do_iplink(int argc, char **argv);
> extern int do_ipmonitor(int argc, char **argv);
> extern int do_multiaddr(int argc, char **argv);
> diff --git a/ip/iptuntap.c b/ip/iptuntap.c
> new file mode 100644
> index 0000000..b480296
> --- /dev/null
> +++ b/ip/iptuntap.c
> @@ -0,0 +1,322 @@
> +/*
> + * iptunnel.c "ip tuntap"
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + *
> + * Authors: David Woodhouse <David.Woodhouse@...el.com>
> + *
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include <sys/socket.h>
> +#include <arpa/inet.h>
> +#include <sys/ioctl.h>
> +#include <linux/if.h>
> +#include <linux/if_tun.h>
> +#include <pwd.h>
> +#include <grp.h>
> +#include <fcntl.h>
> +#include <dirent.h>
> +#include <errno.h>
> +
> +#include "rt_names.h"
> +#include "utils.h"
> +#include "ip_common.h"
> +
> +#define TUNDEV "/dev/net/tun"
> +
> +static void usage(void) __attribute__((noreturn));
> +
> +static void usage(void)
> +{
> + fprintf(stderr, "Usage: ip tuntap { add | del } [ dev PHYS_DEV ] \n");
> + fprintf(stderr, " [ mode { tun | tap } ] [ user USER ] [ group GROUP ]\n");
> + fprintf(stderr, " [ one_queue ] [ no_pi ] [ vnet_hdr ]\n");
> + fprintf(stderr, "\n");
> + fprintf(stderr, "Where: USER := { STRING | NUMBER }\n");
> + fprintf(stderr, " GROUP := { STRING | NUMBER }\n");
> + exit(-1);
> +}
> +
> +static int tap_add_ioctl(struct ifreq *ifr, uid_t uid, gid_t gid)
> +{
> + int fd = open(TUNDEV, O_RDWR);
> + int ret = -1;
> +
> +#ifndef IFF_TUN_EXCL
> +#define IFF_TUN_EXCL 0x8000
> +#endif
> + ifr->ifr_flags |= IFF_TUN_EXCL;
> +
> + if (fd < 0) {
> + perror("open");
> + return -1;
> + }
> + if (ioctl(fd, TUNSETIFF, ifr)) {
> + perror("ioctl(TUNSETIFF)");
> + goto out;
> + }
> + if (uid != -1 && ioctl(fd, TUNSETOWNER, uid)) {
> + perror("ioctl(TUNSETOWNER)");
> + goto out;
> + }
> + if (gid != -1 && ioctl(fd, TUNSETGROUP, gid)) {
> + perror("ioctl(TUNSETGROUP)");
> + goto out;
> + }
> + if (ioctl(fd, TUNSETPERSIST, 1)) {
> + perror("ioctl(TUNSETPERSIST)");
> + goto out;
> + }
> + ret = 0;
> + out:
> + close(fd);
> + return ret;
> +}
> +
I would rather provide a netlink for managing TUNTAP interfaces and reorganize
under ip link??
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