New ioctls were added to let multiple files/sockets to be attached to a tap device.
Signed-off-by: Jason Wang <jasow...@redhat.com> --- drivers/net/tun.c | 25 ++++++++++++++++++++++--- include/linux/if_tun.h | 3 +++ 2 files changed, 25 insertions(+), 3 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index ec29f85..6a1b591 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1343,11 +1343,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, { struct tun_file *tfile = file->private_data; struct tun_struct *tun; + struct net_device *dev = NULL; void __user* argp = (void __user*)arg; struct ifreq ifr; int ret; - if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) + if (cmd == TUNSETIFF || cmd == TUNATTACHQUEUE || _IOC_TYPE(cmd) == 0x89) if (copy_from_user(&ifr, argp, ifreq_len)) return -EFAULT; @@ -1356,7 +1357,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, * This is needed because we never checked for invalid flags on * TUNSETIFF. */ return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | - IFF_VNET_HDR, + IFF_VNET_HDR | IFF_MULTI_QUEUE, (unsigned int __user*)argp); } @@ -1372,6 +1373,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, return -EFAULT; return ret; } + if (cmd == TUNDETACHQUEUE) { + return tun_detach(tfile, false); + } rtnl_lock(); @@ -1379,7 +1383,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, ret = -EBADFD; tun = rcu_dereference(tfile->tun); - if (!tun) + if (!tun && cmd != TUNATTACHQUEUE) goto unlock; @@ -1394,6 +1398,21 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, ret = -EFAULT; goto out; + case TUNATTACHQUEUE: + dev = __dev_get_by_name(tfile->net, ifr.ifr_name); + if (!dev || dev->netdev_ops != &tap_netdev_ops) { + ret = -EINVAL; + } else if (ifr.ifr_flags & + ~(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR)) { + /* ignore illegal flag */ + ret = -EINVAL; + } else { + tfile->flags = TUN_TAP_DEV | TUN_NO_PI | TUN_VNET_HDR; + tun = netdev_priv(dev); + ret = tun_attach(tun, file); + } + break; + case TUNSETNOCSUM: /* Disable/Enable checksum */ diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h index c92a291..d3f24d8 100644 --- a/include/linux/if_tun.h +++ b/include/linux/if_tun.h @@ -54,6 +54,9 @@ #define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog) #define TUNGETVNETHDRSZ _IOR('T', 215, int) #define TUNSETVNETHDRSZ _IOW('T', 216, int) +#define TUNATTACHQUEUE _IOW('T', 217, int) +#define TUNDETACHQUEUE _IOW('T', 218, int) + /* TUNSETIFF ifr flags */ #define IFF_TUN 0x0001 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html