iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'bridge-vlan'

Browse Source 
Nikolay Aleksandrov says:

====================
bridge: vlan: cleanups & fixes (part 3)

Patch 01 converts the vlgrp member to use rcu as it was already used in a
similar way so better to make it official and use all the available RCU
instrumentation. Patch 02 fixes a bug where the vlan_list can be traversed
without rtnl or rcu held which could lead to using freed entries.
Patch 03 removes some redundant code that isn't needed anymore.
Patch 04 fixes a bug reported by Ido Schimmel about the vlan_flush order
and switchdevs, it moves it back.

v2: patch 03 and 04 are new, couldn't escape the second synchronize_rcu()
since the rhtable destruction can sleep
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-10-13 04:58:04 -07:00
commit bbb300eb97
7 changed files with 135 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/bridge/br_device.c
View File

@ -56,7 +56,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
skb_reset_mac_header(skb);
skb_pull(skb, ETH_HLEN);
if (!br_allowed_ingress(br, br_vlan_group(br), skb, &vid))
if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
goto out;
if (is_broadcast_ether_addr(dest))

6
net/bridge/br_forward.c
View File

@ -32,7 +32,7 @@ static inline int should_deliver(const struct net_bridge_port *p,
{
struct net_bridge_vlan_group *vg;
vg = nbp_vlan_group(p);
vg = nbp_vlan_group_rcu(p);
return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING;
}
@ -80,7 +80,7 @@ static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
struct net_bridge_vlan_group *vg;
vg = nbp_vlan_group(to);
vg = nbp_vlan_group_rcu(to);
skb = br_handle_vlan(to->br, vg, skb);
if (!skb)
return;
@ -112,7 +112,7 @@ static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
return;
}
vg = nbp_vlan_group(to);
vg = nbp_vlan_group_rcu(to);
skb = br_handle_vlan(to->br, vg, skb);
if (!skb)
return;

3
net/bridge/br_if.c
View File

@ -248,6 +248,7 @@ static void del_nbp(struct net_bridge_port *p)
list_del_rcu(&p->list);
nbp_vlan_flush(p);
br_fdb_delete_by_port(br, p, 0, 1);
nbp_update_port_count(br);
@ -256,8 +257,6 @@ static void del_nbp(struct net_bridge_port *p)
dev->priv_flags &= ~IFF_BRIDGE_PORT;
netdev_rx_handler_unregister(dev);
/* use the synchronize_rcu done by netdev_rx_handler_unregister */
nbp_vlan_flush(p);
br_multicast_del_port(p);

4
net/bridge/br_input.c
View File

@ -44,7 +44,7 @@ static int br_pass_frame_up(struct sk_buff *skb)
brstats->rx_bytes += skb->len;
u64_stats_update_end(&brstats->syncp);
vg = br_vlan_group(br);
vg = br_vlan_group_rcu(br);
/* Bridge is just like any other port. Make sure the
* packet is allowed except in promisc modue when someone
* may be running packet capture.
@ -140,7 +140,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
if (!p || p->state == BR_STATE_DISABLED)
goto drop;
if (!br_allowed_ingress(p->br, nbp_vlan_group(p), skb, &vid))
if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid))
goto out;
/* insert into forwarding database after filtering to avoid spoofing */

25
net/bridge/br_netlink.c
View File

@ -102,10 +102,10 @@ static size_t br_get_link_af_size_filtered(const struct net_device *dev,
rcu_read_lock();
if (br_port_exists(dev)) {
p = br_port_get_rcu(dev);
vg = nbp_vlan_group(p);
vg = nbp_vlan_group_rcu(p);
} else if (dev->priv_flags & IFF_EBRIDGE) {
br = netdev_priv(dev);
vg = br_vlan_group(br);
vg = br_vlan_group_rcu(br);
}
num_vlan_infos = br_get_num_vlan_infos(vg, filter_mask);
rcu_read_unlock();
@ -253,7 +253,7 @@ static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
* if vlaninfo represents a range
*/
pvid = br_get_pvid(vg);
list_for_each_entry(v, &vg->vlan_list, vlist) {
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
flags = 0;
if (!br_vlan_should_use(v))
continue;
@ -303,7 +303,7 @@ static int br_fill_ifvlaninfo(struct sk_buff *skb,
u16 pvid;
pvid = br_get_pvid(vg);
list_for_each_entry(v, &vg->vlan_list, vlist) {
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
if (!br_vlan_should_use(v))
continue;
@ -386,22 +386,27 @@ static int br_fill_ifinfo(struct sk_buff *skb,
struct nlattr *af;
int err;
/* RCU needed because of the VLAN locking rules (rcu || rtnl) */
rcu_read_lock();
if (port)
vg = nbp_vlan_group(port);
vg = nbp_vlan_group_rcu(port);
else
vg = br_vlan_group(br);
vg = br_vlan_group_rcu(br);
if (!vg || !vg->num_vlans)
if (!vg || !vg->num_vlans) {
rcu_read_unlock();
goto done;
}
af = nla_nest_start(skb, IFLA_AF_SPEC);
if (!af)
if (!af) {
rcu_read_unlock();
goto nla_put_failure;
}
if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
err = br_fill_ifvlaninfo_compressed(skb, vg);
else
err = br_fill_ifvlaninfo(skb, vg);
rcu_read_unlock();
if (err)
goto nla_put_failure;
nla_nest_end(skb, af);

33
net/bridge/br_private.h
View File

@ -229,7 +229,7 @@ struct net_bridge_port
struct netpoll *np;
#endif
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
struct net_bridge_vlan_group *vlgrp;
struct net_bridge_vlan_group __rcu *vlgrp;
#endif
};
@ -337,7 +337,7 @@ struct net_bridge
struct kobject *ifobj;
u32 auto_cnt;
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
struct net_bridge_vlan_group *vlgrp;
struct net_bridge_vlan_group __rcu *vlgrp;
u8 vlan_enabled;
__be16 vlan_proto;
u16 default_pvid;
@ -700,13 +700,25 @@ int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
static inline struct net_bridge_vlan_group *br_vlan_group(
const struct net_bridge *br)
{
return br->vlgrp;
return rtnl_dereference(br->vlgrp);
}
static inline struct net_bridge_vlan_group *nbp_vlan_group(
const struct net_bridge_port *p)
{
return p->vlgrp;
return rtnl_dereference(p->vlgrp);
}
static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
const struct net_bridge *br)
{
return rcu_dereference(br->vlgrp);
}
static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
const struct net_bridge_port *p)
{
return rcu_dereference(p->vlgrp);
}
/* Since bridge now depends on 8021Q module, but the time bridge sees the
@ -853,6 +865,19 @@ static inline struct net_bridge_vlan_group *nbp_vlan_group(
{
return NULL;
}
static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
const struct net_bridge *br)
{
return NULL;
}
static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
const struct net_bridge_port *p)
{
return NULL;
}
#endif
struct nf_br_ops {

133
net/bridge/br_vlan.c
View File

@ -54,9 +54,9 @@ static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
struct net_bridge_vlan_group *vg;
if (br_vlan_is_master(v))
vg = v->br->vlgrp;
vg = br_vlan_group(v->br);
else
vg = v->port->vlgrp;
vg = nbp_vlan_group(v->port);
if (flags & BRIDGE_VLAN_INFO_PVID)
__vlan_add_pvid(vg, v->vid);
@ -91,11 +91,16 @@ static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
static void __vlan_add_list(struct net_bridge_vlan *v)
{
struct net_bridge_vlan_group *vg;
struct list_head *headp, *hpos;
struct net_bridge_vlan *vent;
headp = br_vlan_is_master(v) ? &v->br->vlgrp->vlan_list :
&v->port->vlgrp->vlan_list;
if (br_vlan_is_master(v))
vg = br_vlan_group(v->br);
else
vg = nbp_vlan_group(v->port);
headp = &vg->vlan_list;
list_for_each_prev(hpos, headp) {
vent = list_entry(hpos, struct net_bridge_vlan, vlist);
if (v->vid < vent->vid)
@ -137,14 +142,16 @@ static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
*/
static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *masterv;
masterv = br_vlan_find(br->vlgrp, vid);
vg = br_vlan_group(br);
masterv = br_vlan_find(vg, vid);
if (!masterv) {
/* missing global ctx, create it now */
if (br_vlan_add(br, vid, 0))
return NULL;
masterv = br_vlan_find(br->vlgrp, vid);
masterv = br_vlan_find(vg, vid);
if (WARN_ON(!masterv))
return NULL;
}
@ -155,11 +162,14 @@ static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid
static void br_vlan_put_master(struct net_bridge_vlan *masterv)
{
struct net_bridge_vlan_group *vg;
if (!br_vlan_is_master(masterv))
return;
vg = br_vlan_group(masterv->br);
if (atomic_dec_and_test(&masterv->refcnt)) {
rhashtable_remove_fast(&masterv->br->vlgrp->vlan_hash,
rhashtable_remove_fast(&vg->vlan_hash,
&masterv->vnode, br_vlan_rht_params);
__vlan_del_list(masterv);
kfree_rcu(masterv, rcu);
@ -189,12 +199,12 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
if (br_vlan_is_master(v)) {
br = v->br;
dev = br->dev;
vg = br->vlgrp;
vg = br_vlan_group(br);
} else {
p = v->port;
br = p->br;
dev = p->dev;
vg = p->vlgrp;
vg = nbp_vlan_group(p);
}
if (p) {
@ -266,10 +276,10 @@ static int __vlan_del(struct net_bridge_vlan *v)
int err = 0;
if (br_vlan_is_master(v)) {
vg = v->br->vlgrp;
vg = br_vlan_group(v->br);
} else {
p = v->port;
vg = v->port->vlgrp;
vg = nbp_vlan_group(v->port);
masterv = v->brvlan;
}
@ -297,15 +307,20 @@ out:
return err;
}
static void __vlan_flush(struct net_bridge_vlan_group *vlgrp)
static void __vlan_group_free(struct net_bridge_vlan_group *vg)
{
WARN_ON(!list_empty(&vg->vlan_list));
rhashtable_destroy(&vg->vlan_hash);
kfree(vg);
}
static void __vlan_flush(struct net_bridge_vlan_group *vg)
{
struct net_bridge_vlan *vlan, *tmp;
__vlan_delete_pvid(vlgrp, vlgrp->pvid);
list_for_each_entry_safe(vlan, tmp, &vlgrp->vlan_list, vlist)
__vlan_delete_pvid(vg, vg->pvid);
list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
__vlan_del(vlan);
rhashtable_destroy(&vlgrp->vlan_hash);
kfree(vlgrp);
}
struct sk_buff *br_handle_vlan(struct net_bridge *br,
@ -467,7 +482,7 @@ bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
if (!br->vlan_enabled)
return true;
vg = p->vlgrp;
vg = nbp_vlan_group(p);
if (!vg || !vg->num_vlans)
return false;
@ -493,12 +508,14 @@ bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
*/
int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *vlan;
int ret;
ASSERT_RTNL();
vlan = br_vlan_find(br->vlgrp, vid);
vg = br_vlan_group(br);
vlan = br_vlan_find(vg, vid);
if (vlan) {
if (!br_vlan_is_brentry(vlan)) {
/* Trying to change flags of non-existent bridge vlan */
@ -513,7 +530,7 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
}
atomic_inc(&vlan->refcnt);
vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
br->vlgrp->num_vlans++;
vg->num_vlans++;
}
__vlan_add_flags(vlan, flags);
return 0;
@ -541,11 +558,13 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
*/
int br_vlan_delete(struct net_bridge *br, u16 vid)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
ASSERT_RTNL();
v = br_vlan_find(br->vlgrp, vid);
vg = br_vlan_group(br);
v = br_vlan_find(vg, vid);
if (!v || !br_vlan_is_brentry(v))
return -ENOENT;
@ -557,9 +576,15 @@ int br_vlan_delete(struct net_bridge *br, u16 vid)
void br_vlan_flush(struct net_bridge *br)
{
struct net_bridge_vlan_group *vg;
ASSERT_RTNL();
__vlan_flush(br_vlan_group(br));
vg = br_vlan_group(br);
__vlan_flush(vg);
RCU_INIT_POINTER(br->vlgrp, NULL);
synchronize_rcu();
__vlan_group_free(vg);
}
struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
@ -626,6 +651,7 @@ int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
int err = 0;
struct net_bridge_port *p;
struct net_bridge_vlan *vlan;
struct net_bridge_vlan_group *vg;
__be16 oldproto;
if (br->vlan_proto == proto)
@ -633,7 +659,8 @@ int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
/* Add VLANs for the new proto to the device filter. */
list_for_each_entry(p, &br->port_list, list) {
list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist) {
vg = nbp_vlan_group(p);
list_for_each_entry(vlan, &vg->vlan_list, vlist) {
err = vlan_vid_add(p->dev, proto, vlan->vid);
if (err)
goto err_filt;
@ -647,19 +674,23 @@ int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
br_recalculate_fwd_mask(br);
/* Delete VLANs for the old proto from the device filter. */
list_for_each_entry(p, &br->port_list, list)
list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
list_for_each_entry(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
list_for_each_entry(vlan, &vg->vlan_list, vlist)
vlan_vid_del(p->dev, oldproto, vlan->vid);
}
return 0;
err_filt:
list_for_each_entry_continue_reverse(vlan, &p->vlgrp->vlan_list, vlist)
list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
vlan_vid_del(p->dev, proto, vlan->vid);
list_for_each_entry_continue_reverse(p, &br->port_list, list)
list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
list_for_each_entry_continue_reverse(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
list_for_each_entry(vlan, &vg->vlan_list, vlist)
vlan_vid_del(p->dev, proto, vlan->vid);
}
return err;
}
@ -703,11 +734,11 @@ static void br_vlan_disable_default_pvid(struct net_bridge *br)
/* Disable default_pvid on all ports where it is still
* configured.
*/
if (vlan_default_pvid(br->vlgrp, pvid))
if (vlan_default_pvid(br_vlan_group(br), pvid))
br_vlan_delete(br, pvid);
list_for_each_entry(p, &br->port_list, list) {
if (vlan_default_pvid(p->vlgrp, pvid))
if (vlan_default_pvid(nbp_vlan_group(p), pvid))
nbp_vlan_delete(p, pvid);
}
@ -717,6 +748,7 @@ static void br_vlan_disable_default_pvid(struct net_bridge *br)
int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
{
const struct net_bridge_vlan *pvent;
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
u16 old_pvid;
int err = 0;
@ -737,8 +769,9 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
/* Update default_pvid config only if we do not conflict with
* user configuration.
*/
pvent = br_vlan_find(br->vlgrp, pvid);
if ((!old_pvid || vlan_default_pvid(br->vlgrp, old_pvid)) &&
vg = br_vlan_group(br);
pvent = br_vlan_find(vg, pvid);
if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
(!pvent || !br_vlan_should_use(pvent))) {
err = br_vlan_add(br, pvid,
BRIDGE_VLAN_INFO_PVID |
@ -754,9 +787,10 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
/* Update default_pvid config only if we do not conflict with
* user configuration.
*/
vg = nbp_vlan_group(p);
if ((old_pvid &&
!vlan_default_pvid(p->vlgrp, old_pvid)) ||
br_vlan_find(p->vlgrp, pvid))
!vlan_default_pvid(vg, old_pvid)) ||
br_vlan_find(vg, pvid))
continue;
err = nbp_vlan_add(p, pvid,
@ -825,17 +859,19 @@ unlock:
int br_vlan_init(struct net_bridge *br)
{
struct net_bridge_vlan_group *vg;
int ret = -ENOMEM;
br->vlgrp = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
if (!br->vlgrp)
vg = kzalloc(sizeof(*vg), GFP_KERNEL);
if (!vg)
goto out;
ret = rhashtable_init(&br->vlgrp->vlan_hash, &br_vlan_rht_params);
ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
if (ret)
goto err_rhtbl;
INIT_LIST_HEAD(&br->vlgrp->vlan_list);
INIT_LIST_HEAD(&vg->vlan_list);
br->vlan_proto = htons(ETH_P_8021Q);
br->default_pvid = 1;
rcu_assign_pointer(br->vlgrp, vg);
ret = br_vlan_add(br, 1,
BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
BRIDGE_VLAN_INFO_BRENTRY);
@ -846,9 +882,9 @@ out:
return ret;
err_vlan_add:
rhashtable_destroy(&br->vlgrp->vlan_hash);
rhashtable_destroy(&vg->vlan_hash);
err_rhtbl:
kfree(br->vlgrp);
kfree(vg);
goto out;
}
@ -866,9 +902,7 @@ int nbp_vlan_init(struct net_bridge_port *p)
if (ret)
goto err_rhtbl;
INIT_LIST_HEAD(&vg->vlan_list);
/* Make sure everything's committed before publishing vg */
smp_wmb();
p->vlgrp = vg;
rcu_assign_pointer(p->vlgrp, vg);
if (p->br->default_pvid) {
ret = nbp_vlan_add(p, p->br->default_pvid,
BRIDGE_VLAN_INFO_PVID |
@ -897,7 +931,7 @@ int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
ASSERT_RTNL();
vlan = br_vlan_find(port->vlgrp, vid);
vlan = br_vlan_find(nbp_vlan_group(port), vid);
if (vlan) {
__vlan_add_flags(vlan, flags);
return 0;
@ -925,7 +959,7 @@ int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
ASSERT_RTNL();
v = br_vlan_find(port->vlgrp, vid);
v = br_vlan_find(nbp_vlan_group(port), vid);
if (!v)
return -ENOENT;
br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
@ -936,12 +970,13 @@ int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
void nbp_vlan_flush(struct net_bridge_port *port)
{
struct net_bridge_vlan *vlan;
struct net_bridge_vlan_group *vg;
ASSERT_RTNL();
list_for_each_entry(vlan, &port->vlgrp->vlan_list, vlist)
vlan_vid_del(port->dev, port->br->vlan_proto, vlan->vid);
__vlan_flush(nbp_vlan_group(port));
vg = nbp_vlan_group(port);
__vlan_flush(vg);
RCU_INIT_POINTER(port->vlgrp, NULL);
synchronize_rcu();
__vlan_group_free(vg);
}