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