# This patch allows tun ownership by group. You need a patched tunctl that # supports the new syscall for this to work (see tunctl_gid.diff) From 5a415c2cfbdb0e35d4688a7553901653d1461154 Mon Sep 17 00:00:00 2001 From: Guido Guenther Date: Fri, 25 May 2007 11:10:27 +0200 Subject: [PATCH] allow tun ownership by group --- drivers/net/tun.c | 15 +++++++++++++-- include/linux/if_tun.h | 2 ++ 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index a2c6caa..62b2b30 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -432,6 +432,7 @@ static void tun_setup(struct net_device *dev) init_waitqueue_head(&tun->read_wait); tun->owner = -1; + tun->group = -1; SET_MODULE_OWNER(dev); dev->open = tun_net_open; @@ -467,8 +468,11 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr) return -EBUSY; /* Check permissions */ - if (tun->owner != -1 && - current->euid != tun->owner && !capable(CAP_NET_ADMIN)) + if (((tun->owner != -1 && + current->euid != tun->owner) || + (tun->group != -1 && + current->egid != tun->group)) && + !capable(CAP_NET_ADMIN)) return -EPERM; } else if (__dev_get_by_name(ifr->ifr_name)) @@ -610,6 +614,13 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file, DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); break; + case TUNSETGROUP: + /* Set group of the device */ + tun->group= (gid_t) arg; + + DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); + break; + case TUNSETLINK: /* Only allow setting the type when the interface is down */ if (tun->dev->flags & IFF_UP) { diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h index 88aef7b..42eb694 100644 --- a/include/linux/if_tun.h +++ b/include/linux/if_tun.h @@ -36,6 +36,7 @@ struct tun_struct { unsigned long flags; int attached; uid_t owner; + gid_t group; wait_queue_head_t read_wait; struct sk_buff_head readq; @@ -78,6 +79,7 @@ struct tun_struct { #define TUNSETPERSIST _IOW('T', 203, int) #define TUNSETOWNER _IOW('T', 204, int) #define TUNSETLINK _IOW('T', 205, int) +#define TUNSETGROUP _IOW('T', 206, int) /* TUNSETIFF ifr flags */ #define IFF_TUN 0x0001 -- 1.5.1.4