diff options
Diffstat (limited to '')
| -rw-r--r-- | net/bridge/br_ioctl.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c new file mode 100644 index 000000000..2db800fc2 --- /dev/null +++ b/net/bridge/br_ioctl.c @@ -0,0 +1,397 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Ioctl handler + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek <buytenh@gnu.org> + */ + +#include <linux/capability.h> +#include <linux/kernel.h> +#include <linux/if_bridge.h> +#include <linux/netdevice.h> +#include <linux/slab.h> +#include <linux/times.h> +#include <net/net_namespace.h> +#include <linux/uaccess.h> +#include "br_private.h" + +static int get_bridge_ifindices(struct net *net, int *indices, int num) +{ + struct net_device *dev; + int i = 0; + + rcu_read_lock(); + for_each_netdev_rcu(net, dev) { + if (i >= num) + break; + if (dev->priv_flags & IFF_EBRIDGE) + indices[i++] = dev->ifindex; + } + rcu_read_unlock(); + + return i; +} + +/* called with RTNL */ +static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num) +{ + struct net_bridge_port *p; + + list_for_each_entry(p, &br->port_list, list) { + if (p->port_no < num) + ifindices[p->port_no] = p->dev->ifindex; + } +} + +/* + * Format up to a page worth of forwarding table entries + * userbuf -- where to copy result + * maxnum -- maximum number of entries desired + * (limited to a page for sanity) + * offset -- number of records to skip + */ +static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, + unsigned long maxnum, unsigned long offset) +{ + int num; + void *buf; + size_t size; + + /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ + if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) + maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); + + size = maxnum * sizeof(struct __fdb_entry); + + buf = kmalloc(size, GFP_USER); + if (!buf) + return -ENOMEM; + + num = br_fdb_fillbuf(br, buf, maxnum, offset); + if (num > 0) { + if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry))) + num = -EFAULT; + } + kfree(buf); + + return num; +} + +/* called with RTNL */ +static int add_del_if(struct net_bridge *br, int ifindex, int isadd) +{ + struct net *net = dev_net(br->dev); + struct net_device *dev; + int ret; + + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + dev = __dev_get_by_index(net, ifindex); + if (dev == NULL) + return -EINVAL; + + if (isadd) + ret = br_add_if(br, dev, NULL); + else + ret = br_del_if(br, dev); + + return ret; +} + +/* + * Legacy ioctl's through SIOCDEVPRIVATE + * This interface is deprecated because it was too difficult + * to do the translation for 32/64bit ioctl compatibility. + */ +static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct net_bridge *br = netdev_priv(dev); + struct net_bridge_port *p = NULL; + unsigned long args[4]; + int ret = -EOPNOTSUPP; + + if (copy_from_user(args, rq->ifr_data, sizeof(args))) + return -EFAULT; + + switch (args[0]) { + case BRCTL_ADD_IF: + case BRCTL_DEL_IF: + return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); + + case BRCTL_GET_BRIDGE_INFO: + { + struct __bridge_info b; + + memset(&b, 0, sizeof(struct __bridge_info)); + rcu_read_lock(); + memcpy(&b.designated_root, &br->designated_root, 8); + memcpy(&b.bridge_id, &br->bridge_id, 8); + b.root_path_cost = br->root_path_cost; + b.max_age = jiffies_to_clock_t(br->max_age); + b.hello_time = jiffies_to_clock_t(br->hello_time); + b.forward_delay = br->forward_delay; + b.bridge_max_age = br->bridge_max_age; + b.bridge_hello_time = br->bridge_hello_time; + b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); + b.topology_change = br->topology_change; + b.topology_change_detected = br->topology_change_detected; + b.root_port = br->root_port; + + b.stp_enabled = (br->stp_enabled != BR_NO_STP); + b.ageing_time = jiffies_to_clock_t(br->ageing_time); + b.hello_timer_value = br_timer_value(&br->hello_timer); + b.tcn_timer_value = br_timer_value(&br->tcn_timer); + b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); + b.gc_timer_value = br_timer_value(&br->gc_work.timer); + rcu_read_unlock(); + + if (copy_to_user((void __user *)args[1], &b, sizeof(b))) + return -EFAULT; + + return 0; + } + + case BRCTL_GET_PORT_LIST: + { + int num, *indices; + + num = args[2]; + if (num < 0) + return -EINVAL; + if (num == 0) + num = 256; + if (num > BR_MAX_PORTS) + num = BR_MAX_PORTS; + + indices = kcalloc(num, sizeof(int), GFP_KERNEL); + if (indices == NULL) + return -ENOMEM; + + get_port_ifindices(br, indices, num); + if (copy_to_user((void __user *)args[1], indices, num*sizeof(int))) + num = -EFAULT; + kfree(indices); + return num; + } + + case BRCTL_SET_BRIDGE_FORWARD_DELAY: + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + ret = br_set_forward_delay(br, args[1]); + break; + + case BRCTL_SET_BRIDGE_HELLO_TIME: + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + ret = br_set_hello_time(br, args[1]); + break; + + case BRCTL_SET_BRIDGE_MAX_AGE: + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + ret = br_set_max_age(br, args[1]); + break; + + case BRCTL_SET_AGEING_TIME: + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + ret = br_set_ageing_time(br, args[1]); + break; + + case BRCTL_GET_PORT_INFO: + { + struct __port_info p; + struct net_bridge_port *pt; + + rcu_read_lock(); + if ((pt = br_get_port(br, args[2])) == NULL) { + rcu_read_unlock(); + return -EINVAL; + } + + memset(&p, 0, sizeof(struct __port_info)); + memcpy(&p.designated_root, &pt->designated_root, 8); + memcpy(&p.designated_bridge, &pt->designated_bridge, 8); + p.port_id = pt->port_id; + p.designated_port = pt->designated_port; + p.path_cost = pt->path_cost; + p.designated_cost = pt->designated_cost; + p.state = pt->state; + p.top_change_ack = pt->topology_change_ack; + p.config_pending = pt->config_pending; + p.message_age_timer_value = br_timer_value(&pt->message_age_timer); + p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); + p.hold_timer_value = br_timer_value(&pt->hold_timer); + + rcu_read_unlock(); + + if (copy_to_user((void __user *)args[1], &p, sizeof(p))) + return -EFAULT; + + return 0; + } + + case BRCTL_SET_BRIDGE_STP_STATE: + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + ret = br_stp_set_enabled(br, args[1], NULL); + break; + + case BRCTL_SET_BRIDGE_PRIORITY: + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + br_stp_set_bridge_priority(br, args[1]); + ret = 0; + break; + + case BRCTL_SET_PORT_PRIORITY: + { + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + spin_lock_bh(&br->lock); + if ((p = br_get_port(br, args[1])) == NULL) + ret = -EINVAL; + else + ret = br_stp_set_port_priority(p, args[2]); + spin_unlock_bh(&br->lock); + break; + } + + case BRCTL_SET_PATH_COST: + { + if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + spin_lock_bh(&br->lock); + if ((p = br_get_port(br, args[1])) == NULL) + ret = -EINVAL; + else + ret = br_stp_set_path_cost(p, args[2]); + spin_unlock_bh(&br->lock); + break; + } + + case BRCTL_GET_FDB_ENTRIES: + return get_fdb_entries(br, (void __user *)args[1], + args[2], args[3]); + } + + if (!ret) { + if (p) + br_ifinfo_notify(RTM_NEWLINK, NULL, p); + else + netdev_state_change(br->dev); + } + + return ret; +} + +static int old_deviceless(struct net *net, void __user *uarg) +{ + unsigned long args[3]; + + if (copy_from_user(args, uarg, sizeof(args))) + return -EFAULT; + + switch (args[0]) { + case BRCTL_GET_VERSION: + return BRCTL_VERSION; + + case BRCTL_GET_BRIDGES: + { + int *indices; + int ret = 0; + + if (args[2] >= 2048) + return -ENOMEM; + indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); + if (indices == NULL) + return -ENOMEM; + + args[2] = get_bridge_ifindices(net, indices, args[2]); + + ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) + ? -EFAULT : args[2]; + + kfree(indices); + return ret; + } + + case BRCTL_ADD_BRIDGE: + case BRCTL_DEL_BRIDGE: + { + char buf[IFNAMSIZ]; + + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) + return -EFAULT; + + buf[IFNAMSIZ-1] = 0; + + if (args[0] == BRCTL_ADD_BRIDGE) + return br_add_bridge(net, buf); + + return br_del_bridge(net, buf); + } + } + + return -EOPNOTSUPP; +} + +int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg) +{ + switch (cmd) { + case SIOCGIFBR: + case SIOCSIFBR: + return old_deviceless(net, uarg); + + case SIOCBRADDBR: + case SIOCBRDELBR: + { + char buf[IFNAMSIZ]; + + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + if (copy_from_user(buf, uarg, IFNAMSIZ)) + return -EFAULT; + + buf[IFNAMSIZ-1] = 0; + if (cmd == SIOCBRADDBR) + return br_add_bridge(net, buf); + + return br_del_bridge(net, buf); + } + } + return -EOPNOTSUPP; +} + +int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct net_bridge *br = netdev_priv(dev); + + switch (cmd) { + case SIOCDEVPRIVATE: + return old_dev_ioctl(dev, rq, cmd); + + case SIOCBRADDIF: + case SIOCBRDELIF: + return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); + + } + + br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd); + return -EOPNOTSUPP; +} |