https://github.com/torvalds/linux
Revision 3e493173b7841259a08c5c8e5cbe90adb349da7e authored by Jouni Malinen on 11 September 2019, 13:03:05 UTC, committed by David S. Miller on 11 September 2019, 13:59:26 UTC
The Layer 2 Update frame is used to update bridges when a station roams to another AP even if that STA does not transmit any frames after the reassociation. This behavior was described in IEEE Std 802.11F-2003 as something that would happen based on MLME-ASSOCIATE.indication, i.e., before completing 4-way handshake. However, this IEEE trial-use recommended practice document was published before RSN (IEEE Std 802.11i-2004) and as such, did not consider RSN use cases. Furthermore, IEEE Std 802.11F-2003 was withdrawn in 2006 and as such, has not been maintained amd should not be used anymore. Sending out the Layer 2 Update frame immediately after association is fine for open networks (and also when using SAE, FT protocol, or FILS authentication when the station is actually authenticated by the time association completes). However, it is not appropriate for cases where RSN is used with PSK or EAP authentication since the station is actually fully authenticated only once the 4-way handshake completes after authentication and attackers might be able to use the unauthenticated triggering of Layer 2 Update frame transmission to disrupt bridge behavior. Fix this by postponing transmission of the Layer 2 Update frame from station entry addition to the point when the station entry is marked authorized. Similarly, send out the VLAN binding update only if the STA entry has already been authorized. Signed-off-by: Jouni Malinen <jouni@codeaurora.org> Reviewed-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 3dfdecc
Tip revision: 3e493173b7841259a08c5c8e5cbe90adb349da7e authored by Jouni Malinen on 11 September 2019, 13:03:05 UTC
mac80211: Do not send Layer 2 Update frame before authorization
mac80211: Do not send Layer 2 Update frame before authorization
Tip revision: 3e49317
sysctl_net.c
// SPDX-License-Identifier: GPL-2.0-only
/* -*- linux-c -*-
* sysctl_net.c: sysctl interface to net subsystem.
*
* Begun April 1, 1996, Mike Shaver.
* Added /proc/sys/net directories for each protocol family. [MS]
*
* Revision 1.2 1996/05/08 20:24:40 shaver
* Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
* NET_IPV4_IP_FORWARD.
*
*
*/
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/sysctl.h>
#include <linux/nsproxy.h>
#include <net/sock.h>
#ifdef CONFIG_INET
#include <net/ip.h>
#endif
#ifdef CONFIG_NET
#include <linux/if_ether.h>
#endif
static struct ctl_table_set *
net_ctl_header_lookup(struct ctl_table_root *root)
{
return ¤t->nsproxy->net_ns->sysctls;
}
static int is_seen(struct ctl_table_set *set)
{
return ¤t->nsproxy->net_ns->sysctls == set;
}
/* Return standard mode bits for table entry. */
static int net_ctl_permissions(struct ctl_table_header *head,
struct ctl_table *table)
{
struct net *net = container_of(head->set, struct net, sysctls);
/* Allow network administrator to have same access as root. */
if (ns_capable_noaudit(net->user_ns, CAP_NET_ADMIN)) {
int mode = (table->mode >> 6) & 7;
return (mode << 6) | (mode << 3) | mode;
}
return table->mode;
}
static void net_ctl_set_ownership(struct ctl_table_header *head,
struct ctl_table *table,
kuid_t *uid, kgid_t *gid)
{
struct net *net = container_of(head->set, struct net, sysctls);
kuid_t ns_root_uid;
kgid_t ns_root_gid;
ns_root_uid = make_kuid(net->user_ns, 0);
if (uid_valid(ns_root_uid))
*uid = ns_root_uid;
ns_root_gid = make_kgid(net->user_ns, 0);
if (gid_valid(ns_root_gid))
*gid = ns_root_gid;
}
static struct ctl_table_root net_sysctl_root = {
.lookup = net_ctl_header_lookup,
.permissions = net_ctl_permissions,
.set_ownership = net_ctl_set_ownership,
};
static int __net_init sysctl_net_init(struct net *net)
{
setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
return 0;
}
static void __net_exit sysctl_net_exit(struct net *net)
{
retire_sysctl_set(&net->sysctls);
}
static struct pernet_operations sysctl_pernet_ops = {
.init = sysctl_net_init,
.exit = sysctl_net_exit,
};
static struct ctl_table_header *net_header;
__init int net_sysctl_init(void)
{
static struct ctl_table empty[1];
int ret = -ENOMEM;
/* Avoid limitations in the sysctl implementation by
* registering "/proc/sys/net" as an empty directory not in a
* network namespace.
*/
net_header = register_sysctl("net", empty);
if (!net_header)
goto out;
ret = register_pernet_subsys(&sysctl_pernet_ops);
if (ret)
goto out1;
out:
return ret;
out1:
unregister_sysctl_table(net_header);
net_header = NULL;
goto out;
}
struct ctl_table_header *register_net_sysctl(struct net *net,
const char *path, struct ctl_table *table)
{
return __register_sysctl_table(&net->sysctls, path, table);
}
EXPORT_SYMBOL_GPL(register_net_sysctl);
void unregister_net_sysctl_table(struct ctl_table_header *header)
{
unregister_sysctl_table(header);
}
EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
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