diff options
author | Christoph Hellwig <hch@lst.de> | 2020-05-19 15:03:13 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2020-05-20 00:45:11 +0200 |
commit | 607259a695312cdfac2b52fb9d5b5890c834d573 (patch) | |
tree | 25cf11dce13ddc9c82fb0f3f2f886c697b46227e /net | |
parent | ipv4: consolidate the VIFF_TUNNEL handling in ipmr_new_tunnel (diff) | |
download | linux-607259a695312cdfac2b52fb9d5b5890c834d573.tar.xz linux-607259a695312cdfac2b52fb9d5b5890c834d573.zip |
net: add a new ndo_tunnel_ioctl method
This method is used to properly allow kernel callers of the IPv4 route
management ioctls. The exsting ip_tunnel_ioctl helper is renamed to
ip_tunnel_ctl to better reflect that it doesn't directly implement ioctls
touching user memory, and is used for the guts of ndo_tunnel_ctl
implementations. A new ip_tunnel_ioctl helper is added that can be wired
up directly to the ndo_do_ioctl method and takes care of the copy to and
from userspace.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r-- | net/ipv4/ip_gre.c | 35 | ||||
-rw-r--r-- | net/ipv4/ip_tunnel.c | 16 | ||||
-rw-r--r-- | net/ipv4/ip_vti.c | 32 | ||||
-rw-r--r-- | net/ipv4/ipip.c | 30 |
4 files changed, 51 insertions, 62 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 0ce9b91ff55c..4e31f23e4117 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -768,45 +768,37 @@ static void ipgre_link_update(struct net_device *dev, bool set_mtu) } } -static int ipgre_tunnel_ioctl(struct net_device *dev, - struct ifreq *ifr, int cmd) +static int ipgre_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, + int cmd) { - struct ip_tunnel_parm p; int err; - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) - return -EFAULT; - if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { - if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || - p.iph.ihl != 5 || (p.iph.frag_off & htons(~IP_DF)) || - ((p.i_flags | p.o_flags) & (GRE_VERSION | GRE_ROUTING))) + if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE || + p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) || + ((p->i_flags | p->o_flags) & (GRE_VERSION | GRE_ROUTING))) return -EINVAL; } - p.i_flags = gre_flags_to_tnl_flags(p.i_flags); - p.o_flags = gre_flags_to_tnl_flags(p.o_flags); + p->i_flags = gre_flags_to_tnl_flags(p->i_flags); + p->o_flags = gre_flags_to_tnl_flags(p->o_flags); - err = ip_tunnel_ioctl(dev, &p, cmd); + err = ip_tunnel_ctl(dev, p, cmd); if (err) return err; if (cmd == SIOCCHGTUNNEL) { struct ip_tunnel *t = netdev_priv(dev); - t->parms.i_flags = p.i_flags; - t->parms.o_flags = p.o_flags; + t->parms.i_flags = p->i_flags; + t->parms.o_flags = p->o_flags; if (strcmp(dev->rtnl_link_ops->kind, "erspan")) ipgre_link_update(dev, true); } - p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags); - p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags); - - if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) - return -EFAULT; - + p->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); + p->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); return 0; } @@ -924,10 +916,11 @@ static const struct net_device_ops ipgre_netdev_ops = { .ndo_stop = ipgre_close, #endif .ndo_start_xmit = ipgre_xmit, - .ndo_do_ioctl = ipgre_tunnel_ioctl, + .ndo_do_ioctl = ip_tunnel_ioctl, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, + .ndo_tunnel_ctl = ipgre_tunnel_ctl, }; #define GRE_FEATURES (NETIF_F_SG | \ diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index cd4b84310d92..f4f1d11eab50 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -860,7 +860,7 @@ static void ip_tunnel_update(struct ip_tunnel_net *itn, netdev_state_change(dev); } -int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) +int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) { int err = 0; struct ip_tunnel *t = netdev_priv(dev); @@ -960,6 +960,20 @@ int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) done: return err; } +EXPORT_SYMBOL_GPL(ip_tunnel_ctl); + +int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + struct ip_tunnel_parm p; + int err; + + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) + return -EFAULT; + err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd); + if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) + return -EFAULT; + return err; +} EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c index 1b4e6f298648..c8974360a99f 100644 --- a/net/ipv4/ip_vti.c +++ b/net/ipv4/ip_vti.c @@ -378,38 +378,31 @@ static int vti4_err(struct sk_buff *skb, u32 info) } static int -vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) { int err = 0; - struct ip_tunnel_parm p; - - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) - return -EFAULT; if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { - if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || - p.iph.ihl != 5) + if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || + p->iph.ihl != 5) return -EINVAL; } - if (!(p.i_flags & GRE_KEY)) - p.i_key = 0; - if (!(p.o_flags & GRE_KEY)) - p.o_key = 0; + if (!(p->i_flags & GRE_KEY)) + p->i_key = 0; + if (!(p->o_flags & GRE_KEY)) + p->o_key = 0; - p.i_flags = VTI_ISVTI; + p->i_flags = VTI_ISVTI; - err = ip_tunnel_ioctl(dev, &p, cmd); + err = ip_tunnel_ctl(dev, p, cmd); if (err) return err; if (cmd != SIOCDELTUNNEL) { - p.i_flags |= GRE_KEY; - p.o_flags |= GRE_KEY; + p->i_flags |= GRE_KEY; + p->o_flags |= GRE_KEY; } - - if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) - return -EFAULT; return 0; } @@ -417,10 +410,11 @@ static const struct net_device_ops vti_netdev_ops = { .ndo_init = vti_tunnel_init, .ndo_uninit = ip_tunnel_uninit, .ndo_start_xmit = vti_tunnel_xmit, - .ndo_do_ioctl = vti_tunnel_ioctl, + .ndo_do_ioctl = ip_tunnel_ioctl, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, + .ndo_tunnel_ctl = vti_tunnel_ctl, }; static void vti_tunnel_setup(struct net_device *dev) diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c index 2f01cf6fa0de..df663baf2516 100644 --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -327,41 +327,29 @@ static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) } static int -ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) { - int err = 0; - struct ip_tunnel_parm p; - - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) - return -EFAULT; - if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { - if (p.iph.version != 4 || - !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) || - p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) + if (p->iph.version != 4 || + !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) || + p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) return -EINVAL; } - p.i_key = p.o_key = 0; - p.i_flags = p.o_flags = 0; - err = ip_tunnel_ioctl(dev, &p, cmd); - if (err) - return err; - - if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) - return -EFAULT; - - return 0; + p->i_key = p->o_key = 0; + p->i_flags = p->o_flags = 0; + return ip_tunnel_ctl(dev, p, cmd); } static const struct net_device_ops ipip_netdev_ops = { .ndo_init = ipip_tunnel_init, .ndo_uninit = ip_tunnel_uninit, .ndo_start_xmit = ipip_tunnel_xmit, - .ndo_do_ioctl = ipip_tunnel_ioctl, + .ndo_do_ioctl = ip_tunnel_ioctl, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, + .ndo_tunnel_ctl = ipip_tunnel_ctl, }; #define IPIP_FEATURES (NETIF_F_SG | \ |