From bf4405737f9f85a06db2b0ce5d76a818b61992e2 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 30 Sep 2017 19:31:15 -0400 Subject: kill dev_ifsioc() Once upon a time net/socket.c:dev_ifsioc() used to handle SIOCSHWTSTAMP and SIOCSIFMAP. These have different native and compat layout, so the format conversion had been needed. In 2009 these two cases had been taken out, turning the rest into a convoluted way to calling sock_do_ioctl(). We copy compat structure into native one, call sock_do_ioctl() on that and copy the result back for the in/out ioctls. No layout transformation anywhere, so we might as well just call sock_do_ioctl() and skip all the headache with copying. Signed-off-by: Al Viro --- net/socket.c | 38 -------------------------------------- 1 file changed, 38 deletions(-) (limited to 'net') diff --git a/net/socket.c b/net/socket.c index 96e5b23a2a2e..fd593a86fa76 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2906,42 +2906,6 @@ static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, return dev_ioctl(net, cmd, u_ifreq64); } -static int dev_ifsioc(struct net *net, struct socket *sock, - unsigned int cmd, struct compat_ifreq __user *uifr32) -{ - struct ifreq __user *uifr; - int err; - - uifr = compat_alloc_user_space(sizeof(*uifr)); - if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) - return -EFAULT; - - err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); - - if (!err) { - switch (cmd) { - case SIOCGIFFLAGS: - case SIOCGIFMETRIC: - case SIOCGIFMTU: - case SIOCGIFMEM: - case SIOCGIFHWADDR: - case SIOCGIFINDEX: - case SIOCGIFADDR: - case SIOCGIFBRDADDR: - case SIOCGIFDSTADDR: - case SIOCGIFNETMASK: - case SIOCGIFPFLAGS: - case SIOCGIFTXQLEN: - case SIOCGMIIPHY: - case SIOCGMIIREG: - if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) - err = -EFAULT; - break; - } - } - return err; -} - static int compat_sioc_ifmap(struct net *net, unsigned int cmd, struct compat_ifreq __user *uifr32) { @@ -3172,8 +3136,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, case SIOCGMIIPHY: case SIOCGMIIREG: case SIOCSMIIREG: - return dev_ifsioc(net, sock, cmd, argp); - case SIOCSARP: case SIOCGARP: case SIOCDARP: -- cgit v1.2.3