diff options
| -rw-r--r-- | net/ipv6/ip6_tunnel.c | 111 |
1 files changed, 46 insertions, 65 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 25bc5ed49104..fdf1a2fa3a3d 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -215,11 +215,10 @@ ip6ip6_tnl_unlink(struct ip6_tnl *t) * Create tunnel matching given parameters. * * Return: - * 0 on success + * created tunnel or NULL **/ -static int -ip6_tnl_create(struct ip6_tnl_parm *p, struct ip6_tnl **pt) +static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p) { struct net_device *dev; struct ip6_tnl *t; @@ -236,11 +235,11 @@ ip6_tnl_create(struct ip6_tnl_parm *p, struct ip6_tnl **pt) break; } if (i == IP6_TNL_MAX) - return -ENOBUFS; + goto failed; } dev = alloc_netdev(sizeof (*t), name, ip6ip6_tnl_dev_setup); if (dev == NULL) - return -ENOMEM; + goto failed; t = netdev_priv(dev); dev->init = ip6ip6_tnl_dev_init; @@ -248,13 +247,13 @@ ip6_tnl_create(struct ip6_tnl_parm *p, struct ip6_tnl **pt) if ((err = register_netdevice(dev)) < 0) { free_netdev(dev); - return err; + goto failed; } dev_hold(dev); - ip6ip6_tnl_link(t); - *pt = t; - return 0; + return t; +failed: + return NULL; } /** @@ -268,32 +267,23 @@ ip6_tnl_create(struct ip6_tnl_parm *p, struct ip6_tnl **pt) * tunnel device is created and registered for use. * * Return: - * 0 if tunnel located or created, - * -EINVAL if parameters incorrect, - * -ENODEV if no matching tunnel available + * matching tunnel or NULL **/ -static int -ip6ip6_tnl_locate(struct ip6_tnl_parm *p, struct ip6_tnl **pt, int create) +static struct ip6_tnl *ip6ip6_tnl_locate(struct ip6_tnl_parm *p, int create) { struct in6_addr *remote = &p->raddr; struct in6_addr *local = &p->laddr; struct ip6_tnl *t; - if (p->proto != IPPROTO_IPV6) - return -EINVAL; - for (t = *ip6ip6_bucket(p); t; t = t->next) { if (ipv6_addr_equal(local, &t->parms.laddr) && - ipv6_addr_equal(remote, &t->parms.raddr)) { - *pt = t; - return (create ? -EEXIST : 0); - } + ipv6_addr_equal(remote, &t->parms.raddr)) + return t; } if (!create) - return -ENODEV; - - return ip6_tnl_create(p, pt); + return NULL; + return ip6_tnl_create(p); } /** @@ -920,26 +910,20 @@ static int ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { int err = 0; - int create; struct ip6_tnl_parm p; struct ip6_tnl *t = NULL; switch (cmd) { case SIOCGETTUNNEL: if (dev == ip6ip6_fb_tnl_dev) { - if (copy_from_user(&p, - ifr->ifr_ifru.ifru_data, - sizeof (p))) { + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { err = -EFAULT; break; } - if ((err = ip6ip6_tnl_locate(&p, &t, 0)) == -ENODEV) - t = netdev_priv(dev); - else if (err) - break; - } else + t = ip6ip6_tnl_locate(&p, 0); + } + if (t == NULL) t = netdev_priv(dev); - memcpy(&p, &t->parms, sizeof (p)); if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { err = -EFAULT; @@ -948,35 +932,36 @@ ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) case SIOCADDTUNNEL: case SIOCCHGTUNNEL: err = -EPERM; - create = (cmd == SIOCADDTUNNEL); if (!capable(CAP_NET_ADMIN)) break; - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { - err = -EFAULT; + err = -EFAULT; + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) break; - } - if (!create && dev != ip6ip6_fb_tnl_dev) { - t = netdev_priv(dev); - } - if (!t && (err = ip6ip6_tnl_locate(&p, &t, create))) { + err = -EINVAL; + if (p.proto != IPPROTO_IPV6) break; - } - if (cmd == SIOCCHGTUNNEL) { - if (t->dev != dev) { - err = -EEXIST; - break; - } + t = ip6ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL); + if (dev != ip6ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) { + if (t != NULL) { + if (t->dev != dev) { + err = -EEXIST; + break; + } + } else + t = netdev_priv(dev); + ip6ip6_tnl_unlink(t); err = ip6ip6_tnl_change(t, &p); ip6ip6_tnl_link(t); netdev_state_change(dev); } - if (copy_to_user(ifr->ifr_ifru.ifru_data, - &t->parms, sizeof (p))) { - err = -EFAULT; - } else { + if (t) { err = 0; - } + if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) + err = -EFAULT; + + } else + err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); break; case SIOCDELTUNNEL: err = -EPERM; @@ -984,22 +969,18 @@ ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) break; if (dev == ip6ip6_fb_tnl_dev) { - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, - sizeof (p))) { - err = -EFAULT; + err = -EFAULT; + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) break; - } - err = ip6ip6_tnl_locate(&p, &t, 0); - if (err) + err = -ENOENT; + if ((t = ip6ip6_tnl_locate(&p, 0)) == NULL) break; - if (t == netdev_priv(ip6ip6_fb_tnl_dev)) { - err = -EPERM; + err = -EPERM; + if (t->dev == ip6ip6_fb_tnl_dev) break; - } - } else { - t = netdev_priv(dev); + dev = t->dev; } - err = unregister_netdevice(t->dev); + err = unregister_netdevice(dev); break; default: err = -EINVAL; |