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linux-next/net/bridge/br_vlan.c
Kuniyuki Iwashima cba5e43b0b bridge: Handle error of rtnl_register_module(). 
Since introduced, br_vlan_rtnl_init() has been ignoring the returned
value of rtnl_register_module(), which could fail silently.

Handling the error allows users to view a module as an all-or-nothing
thing in terms of the rtnetlink functionality.  This prevents syzkaller
from reporting spurious errors from its tests, where OOM often occurs
and module is automatically loaded.

Let's handle the errors by rtnl_register_many().

Fixes: 8dcea18708 ("net: bridge: vlan: add rtm definitions and dump support")
Fixes: f26b296585 ("net: bridge: vlan: add new rtm message support")
Fixes: adb3ce9bcb ("net: bridge: vlan: add del rtm message support")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-10-10 15:39:35 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <net/switchdev.h>
#include "br_private.h"
#include "br_private_tunnel.h"
static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid);
static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
const void *ptr)
{
const struct net_bridge_vlan *vle = ptr;
u16 vid = *(u16 *)arg->key;
return vle->vid != vid;
}
static const struct rhashtable_params br_vlan_rht_params = {
.head_offset = offsetof(struct net_bridge_vlan, vnode),
.key_offset = offsetof(struct net_bridge_vlan, vid),
.key_len = sizeof(u16),
.nelem_hint = 3,
.max_size = VLAN_N_VID,
.obj_cmpfn = br_vlan_cmp,
.automatic_shrinking = true,
};
static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
{
return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
}
static void __vlan_add_pvid(struct net_bridge_vlan_group *vg,
const struct net_bridge_vlan *v)
{
if (vg->pvid == v->vid)
return;
smp_wmb();
br_vlan_set_pvid_state(vg, v->state);
vg->pvid = v->vid;
}
static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
{
if (vg->pvid != vid)
return;
smp_wmb();
vg->pvid = 0;
}
/* Update the BRIDGE_VLAN_INFO_PVID and BRIDGE_VLAN_INFO_UNTAGGED flags of @v.
* If @commit is false, return just whether the BRIDGE_VLAN_INFO_PVID and
* BRIDGE_VLAN_INFO_UNTAGGED bits of @flags would produce any change onto @v.
*/
static bool __vlan_flags_update(struct net_bridge_vlan *v, u16 flags,
bool commit)
{
struct net_bridge_vlan_group *vg;
bool change;
if (br_vlan_is_master(v))
vg = br_vlan_group(v->br);
else
vg = nbp_vlan_group(v->port);
/* check if anything would be changed on commit */
change = !!(flags & BRIDGE_VLAN_INFO_PVID) == !!(vg->pvid != v->vid) ||
((flags ^ v->flags) & BRIDGE_VLAN_INFO_UNTAGGED);
if (!commit)
goto out;
if (flags & BRIDGE_VLAN_INFO_PVID)
__vlan_add_pvid(vg, v);
else
__vlan_delete_pvid(vg, v->vid);
if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
else
v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
out:
return change;
}
static bool __vlan_flags_would_change(struct net_bridge_vlan *v, u16 flags)
{
return __vlan_flags_update(v, flags, false);
}
static void __vlan_flags_commit(struct net_bridge_vlan *v, u16 flags)
{
__vlan_flags_update(v, flags, true);
}
static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
struct net_bridge_vlan *v, u16 flags,
struct netlink_ext_ack *extack)
{
int err;
/* Try switchdev op first. In case it is not supported, fallback to
* 8021q add.
*/
err = br_switchdev_port_vlan_add(dev, v->vid, flags, false, extack);
if (err == -EOPNOTSUPP)
return vlan_vid_add(dev, br->vlan_proto, v->vid);
v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV;
return err;
}
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;
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)
break;
}
list_add_rcu(&v->vlist, hpos);
}
static void __vlan_del_list(struct net_bridge_vlan *v)
{
list_del_rcu(&v->vlist);
}
static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
const struct net_bridge_vlan *v)
{
int err;
/* Try switchdev op first. In case it is not supported, fallback to
* 8021q del.
*/
err = br_switchdev_port_vlan_del(dev, v->vid);
if (!(v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV))
vlan_vid_del(dev, br->vlan_proto, v->vid);
return err == -EOPNOTSUPP ? 0 : err;
}
/* Returns a master vlan, if it didn't exist it gets created. In all cases
* a reference is taken to the master vlan before returning.
*/
static struct net_bridge_vlan *
br_vlan_get_master(struct net_bridge *br, u16 vid,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *masterv;
vg = br_vlan_group(br);
masterv = br_vlan_find(vg, vid);
if (!masterv) {
bool changed;
/* missing global ctx, create it now */
if (br_vlan_add(br, vid, 0, &changed, extack))
return NULL;
masterv = br_vlan_find(vg, vid);
if (WARN_ON(!masterv))
return NULL;
refcount_set(&masterv->refcnt, 1);
return masterv;
}
refcount_inc(&masterv->refcnt);
return masterv;
}
static void br_master_vlan_rcu_free(struct rcu_head *rcu)
{
struct net_bridge_vlan *v;
v = container_of(rcu, struct net_bridge_vlan, rcu);
WARN_ON(!br_vlan_is_master(v));
free_percpu(v->stats);
v->stats = NULL;
kfree(v);
}
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 (refcount_dec_and_test(&masterv->refcnt)) {
rhashtable_remove_fast(&vg->vlan_hash,
&masterv->vnode, br_vlan_rht_params);
__vlan_del_list(masterv);
br_multicast_toggle_one_vlan(masterv, false);
br_multicast_ctx_deinit(&masterv->br_mcast_ctx);
call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
}
}
static void nbp_vlan_rcu_free(struct rcu_head *rcu)
{
struct net_bridge_vlan *v;
v = container_of(rcu, struct net_bridge_vlan, rcu);
WARN_ON(br_vlan_is_master(v));
/* if we had per-port stats configured then free them here */
if (v->priv_flags & BR_VLFLAG_PER_PORT_STATS)
free_percpu(v->stats);
v->stats = NULL;
kfree(v);
}
static void br_vlan_init_state(struct net_bridge_vlan *v)
{
struct net_bridge *br;
if (br_vlan_is_master(v))
br = v->br;
else
br = v->port->br;
if (br_opt_get(br, BROPT_MST_ENABLED)) {
br_mst_vlan_init_state(v);
return;
}
v->state = BR_STATE_FORWARDING;
v->msti = 0;
}
/* This is the shared VLAN add function which works for both ports and bridge
* devices. There are four possible calls to this function in terms of the
* vlan entry type:
* 1. vlan is being added on a port (no master flags, global entry exists)
* 2. vlan is being added on a bridge (both master and brentry flags)
* 3. vlan is being added on a port, but a global entry didn't exist which
* is being created right now (master flag set, brentry flag unset), the
* global entry is used for global per-vlan features, but not for filtering
* 4. same as 3 but with both master and brentry flags set so the entry
* will be used for filtering in both the port and the bridge
*/
static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan *masterv = NULL;
struct net_bridge_port *p = NULL;
struct net_bridge_vlan_group *vg;
struct net_device *dev;
struct net_bridge *br;
int err;
if (br_vlan_is_master(v)) {
br = v->br;
dev = br->dev;
vg = br_vlan_group(br);
} else {
p = v->port;
br = p->br;
dev = p->dev;
vg = nbp_vlan_group(p);
}
if (p) {
/* Add VLAN to the device filter if it is supported.
* This ensures tagged traffic enters the bridge when
* promiscuous mode is disabled by br_manage_promisc().
*/
err = __vlan_vid_add(dev, br, v, flags, extack);
if (err)
goto out;
/* need to work on the master vlan too */
if (flags & BRIDGE_VLAN_INFO_MASTER) {
bool changed;
err = br_vlan_add(br, v->vid,
flags | BRIDGE_VLAN_INFO_BRENTRY,
&changed, extack);
if (err)
goto out_filt;
if (changed)
br_vlan_notify(br, NULL, v->vid, 0,
RTM_NEWVLAN);
}
masterv = br_vlan_get_master(br, v->vid, extack);
if (!masterv) {
err = -ENOMEM;
goto out_filt;
}
v->brvlan = masterv;
if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) {
v->stats =
netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!v->stats) {
err = -ENOMEM;
goto out_filt;
}
v->priv_flags |= BR_VLFLAG_PER_PORT_STATS;
} else {
v->stats = masterv->stats;
}
br_multicast_port_ctx_init(p, v, &v->port_mcast_ctx);
} else {
if (br_vlan_should_use(v)) {
err = br_switchdev_port_vlan_add(dev, v->vid, flags,
false, extack);
if (err && err != -EOPNOTSUPP)
goto out;
}
br_multicast_ctx_init(br, v, &v->br_mcast_ctx);
v->priv_flags |= BR_VLFLAG_GLOBAL_MCAST_ENABLED;
}
/* Add the dev mac and count the vlan only if it's usable */
if (br_vlan_should_use(v)) {
err = br_fdb_add_local(br, p, dev->dev_addr, v->vid);
if (err) {
br_err(br, "failed insert local address into bridge forwarding table\n");
goto out_filt;
}
vg->num_vlans++;
}
/* set the state before publishing */
br_vlan_init_state(v);
err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
br_vlan_rht_params);
if (err)
goto out_fdb_insert;
__vlan_add_list(v);
__vlan_flags_commit(v, flags);
br_multicast_toggle_one_vlan(v, true);
if (p)
nbp_vlan_set_vlan_dev_state(p, v->vid);
out:
return err;
out_fdb_insert:
if (br_vlan_should_use(v)) {
br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
vg->num_vlans--;
}
out_filt:
if (p) {
__vlan_vid_del(dev, br, v);
if (masterv) {
if (v->stats && masterv->stats != v->stats)
free_percpu(v->stats);
v->stats = NULL;
br_vlan_put_master(masterv);
v->brvlan = NULL;
}
} else {
br_switchdev_port_vlan_del(dev, v->vid);
}
goto out;
}
static int __vlan_del(struct net_bridge_vlan *v)
{
struct net_bridge_vlan *masterv = v;
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p = NULL;
int err = 0;
if (br_vlan_is_master(v)) {
vg = br_vlan_group(v->br);
} else {
p = v->port;
vg = nbp_vlan_group(v->port);
masterv = v->brvlan;
}
__vlan_delete_pvid(vg, v->vid);
if (p) {
err = __vlan_vid_del(p->dev, p->br, v);
if (err)
goto out;
} else {
err = br_switchdev_port_vlan_del(v->br->dev, v->vid);
if (err && err != -EOPNOTSUPP)
goto out;
err = 0;
}
if (br_vlan_should_use(v)) {
v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
vg->num_vlans--;
}
if (masterv != v) {
vlan_tunnel_info_del(vg, v);
rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
br_vlan_rht_params);
__vlan_del_list(v);
nbp_vlan_set_vlan_dev_state(p, v->vid);
br_multicast_toggle_one_vlan(v, false);
br_multicast_port_ctx_deinit(&v->port_mcast_ctx);
call_rcu(&v->rcu, nbp_vlan_rcu_free);
}
br_vlan_put_master(masterv);
out:
return err;
}
static void __vlan_group_free(struct net_bridge_vlan_group *vg)
{
WARN_ON(!list_empty(&vg->vlan_list));
rhashtable_destroy(&vg->vlan_hash);
vlan_tunnel_deinit(vg);
kfree(vg);
}
static void __vlan_flush(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg)
{
struct net_bridge_vlan *vlan, *tmp;
u16 v_start = 0, v_end = 0;
int err;
__vlan_delete_pvid(vg, vg->pvid);
list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) {
/* take care of disjoint ranges */
if (!v_start) {
v_start = vlan->vid;
} else if (vlan->vid - v_end != 1) {
/* found range end, notify and start next one */
br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
v_start = vlan->vid;
}
v_end = vlan->vid;
err = __vlan_del(vlan);
if (err) {
br_err(br,
"port %u(%s) failed to delete vlan %d: %pe\n",
(unsigned int) p->port_no, p->dev->name,
vlan->vid, ERR_PTR(err));
}
}
/* notify about the last/whole vlan range */
if (v_start)
br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
}
struct sk_buff *br_handle_vlan(struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg,
struct sk_buff *skb)
{
struct pcpu_sw_netstats *stats;
struct net_bridge_vlan *v;
u16 vid;
/* If this packet was not filtered at input, let it pass */
if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
goto out;
/* At this point, we know that the frame was filtered and contains
* a valid vlan id. If the vlan id has untagged flag set,
* send untagged; otherwise, send tagged.
*/
br_vlan_get_tag(skb, &vid);
v = br_vlan_find(vg, vid);
/* Vlan entry must be configured at this point. The
* only exception is the bridge is set in promisc mode and the
* packet is destined for the bridge device. In this case
* pass the packet as is.
*/
if (!v || !br_vlan_should_use(v)) {
if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
goto out;
} else {
kfree_skb(skb);
return NULL;
}
}
if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
stats = this_cpu_ptr(v->stats);
u64_stats_update_begin(&stats->syncp);
u64_stats_add(&stats->tx_bytes, skb->len);
u64_stats_inc(&stats->tx_packets);
u64_stats_update_end(&stats->syncp);
}
/* If the skb will be sent using forwarding offload, the assumption is
* that the switchdev will inject the packet into hardware together
* with the bridge VLAN, so that it can be forwarded according to that
* VLAN. The switchdev should deal with popping the VLAN header in
* hardware on each egress port as appropriate. So only strip the VLAN
* header if forwarding offload is not being used.
*/
if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED &&
!br_switchdev_frame_uses_tx_fwd_offload(skb))
__vlan_hwaccel_clear_tag(skb);
if (p && (p->flags & BR_VLAN_TUNNEL) &&
br_handle_egress_vlan_tunnel(skb, v)) {
kfree_skb(skb);
return NULL;
}
out:
return skb;
}
/* Called under RCU */
static bool __allowed_ingress(const struct net_bridge *br,
struct net_bridge_vlan_group *vg,
struct sk_buff *skb, u16 *vid,
u8 *state,
struct net_bridge_vlan **vlan)
{
struct pcpu_sw_netstats *stats;
struct net_bridge_vlan *v;
bool tagged;
BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
/* If vlan tx offload is disabled on bridge device and frame was
* sent from vlan device on the bridge device, it does not have
* HW accelerated vlan tag.
*/
if (unlikely(!skb_vlan_tag_present(skb) &&
skb->protocol == br->vlan_proto)) {
skb = skb_vlan_untag(skb);
if (unlikely(!skb))
return false;
}
if (!br_vlan_get_tag(skb, vid)) {
/* Tagged frame */
if (skb->vlan_proto != br->vlan_proto) {
/* Protocol-mismatch, empty out vlan_tci for new tag */
skb_push(skb, ETH_HLEN);
skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
skb_vlan_tag_get(skb));
if (unlikely(!skb))
return false;
skb_pull(skb, ETH_HLEN);
skb_reset_mac_len(skb);
*vid = 0;
tagged = false;
} else {
tagged = true;
}
} else {
/* Untagged frame */
tagged = false;
}
if (!*vid) {
u16 pvid = br_get_pvid(vg);
/* Frame had a tag with VID 0 or did not have a tag.
* See if pvid is set on this port. That tells us which
* vlan untagged or priority-tagged traffic belongs to.
*/
if (!pvid)
goto drop;
/* PVID is set on this port. Any untagged or priority-tagged
* ingress frame is considered to belong to this vlan.
*/
*vid = pvid;
if (likely(!tagged))
/* Untagged Frame. */
__vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
else
/* Priority-tagged Frame.
* At this point, we know that skb->vlan_tci VID
* field was 0.
* We update only VID field and preserve PCP field.
*/
skb->vlan_tci |= pvid;
/* if snooping and stats are disabled we can avoid the lookup */
if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) &&
!br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
if (*state == BR_STATE_FORWARDING) {
*state = br_vlan_get_pvid_state(vg);
if (!br_vlan_state_allowed(*state, true))
goto drop;
}
return true;
}
}
v = br_vlan_find(vg, *vid);
if (!v || !br_vlan_should_use(v))
goto drop;
if (*state == BR_STATE_FORWARDING) {
*state = br_vlan_get_state(v);
if (!br_vlan_state_allowed(*state, true))
goto drop;
}
if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
stats = this_cpu_ptr(v->stats);
u64_stats_update_begin(&stats->syncp);
u64_stats_add(&stats->rx_bytes, skb->len);
u64_stats_inc(&stats->rx_packets);
u64_stats_update_end(&stats->syncp);
}
*vlan = v;
return true;
drop:
kfree_skb(skb);
return false;
}
bool br_allowed_ingress(const struct net_bridge *br,
struct net_bridge_vlan_group *vg, struct sk_buff *skb,
u16 *vid, u8 *state,
struct net_bridge_vlan **vlan)
{
/* If VLAN filtering is disabled on the bridge, all packets are
* permitted.
*/
*vlan = NULL;
if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
return true;
}
return __allowed_ingress(br, vg, skb, vid, state, vlan);
}
/* Called under RCU. */
bool br_allowed_egress(struct net_bridge_vlan_group *vg,
const struct sk_buff *skb)
{
const struct net_bridge_vlan *v;
u16 vid;
/* If this packet was not filtered at input, let it pass */
if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
return true;
br_vlan_get_tag(skb, &vid);
v = br_vlan_find(vg, vid);
if (v && br_vlan_should_use(v) &&
br_vlan_state_allowed(br_vlan_get_state(v), false))
return true;
return false;
}
/* Called under RCU */
bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
{
struct net_bridge_vlan_group *vg;
struct net_bridge *br = p->br;
struct net_bridge_vlan *v;
/* If filtering was disabled at input, let it pass. */
if (!br_opt_get(br, BROPT_VLAN_ENABLED))
return true;
vg = nbp_vlan_group_rcu(p);
if (!vg || !vg->num_vlans)
return false;
if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
*vid = 0;
if (!*vid) {
*vid = br_get_pvid(vg);
if (!*vid ||
!br_vlan_state_allowed(br_vlan_get_pvid_state(vg), true))
return false;
return true;
}
v = br_vlan_find(vg, *vid);
if (v && br_vlan_state_allowed(br_vlan_get_state(v), true))
return true;
return false;
}
static int br_vlan_add_existing(struct net_bridge *br,
struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *vlan,
u16 flags, bool *changed,
struct netlink_ext_ack *extack)
{
bool would_change = __vlan_flags_would_change(vlan, flags);
bool becomes_brentry = false;
int err;
if (!br_vlan_is_brentry(vlan)) {
/* Trying to change flags of non-existent bridge vlan */
if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
return -EINVAL;
becomes_brentry = true;
}
/* Master VLANs that aren't brentries weren't notified before,
* time to notify them now.
*/
if (becomes_brentry || would_change) {
err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags,
would_change, extack);
if (err && err != -EOPNOTSUPP)
return err;
}
if (becomes_brentry) {
/* It was only kept for port vlans, now make it real */
err = br_fdb_add_local(br, NULL, br->dev->dev_addr, vlan->vid);
if (err) {
br_err(br, "failed to insert local address into bridge forwarding table\n");
goto err_fdb_insert;
}
refcount_inc(&vlan->refcnt);
vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
vg->num_vlans++;
*changed = true;
br_multicast_toggle_one_vlan(vlan, true);
}
__vlan_flags_commit(vlan, flags);
if (would_change)
*changed = true;
return 0;
err_fdb_insert:
br_switchdev_port_vlan_del(br->dev, vlan->vid);
return err;
}
/* Must be protected by RTNL.
* Must be called with vid in range from 1 to 4094 inclusive.
* changed must be true only if the vlan was created or updated
*/
int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *vlan;
int ret;
ASSERT_RTNL();
*changed = false;
vg = br_vlan_group(br);
vlan = br_vlan_find(vg, vid);
if (vlan)
return br_vlan_add_existing(br, vg, vlan, flags, changed,
extack);
vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
if (!vlan)
return -ENOMEM;
vlan->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!vlan->stats) {
kfree(vlan);
return -ENOMEM;
}
vlan->vid = vid;
vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
vlan->br = br;
if (flags & BRIDGE_VLAN_INFO_BRENTRY)
refcount_set(&vlan->refcnt, 1);
ret = __vlan_add(vlan, flags, extack);
if (ret) {
free_percpu(vlan->stats);
kfree(vlan);
} else {
*changed = true;
}
return ret;
}
/* Must be protected by RTNL.
* Must be called with vid in range from 1 to 4094 inclusive.
*/
int br_vlan_delete(struct net_bridge *br, u16 vid)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
ASSERT_RTNL();
vg = br_vlan_group(br);
v = br_vlan_find(vg, vid);
if (!v || !br_vlan_is_brentry(v))
return -ENOENT;
br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
br_fdb_delete_by_port(br, NULL, vid, 0);
vlan_tunnel_info_del(vg, v);
return __vlan_del(v);
}
void br_vlan_flush(struct net_bridge *br)
{
struct net_bridge_vlan_group *vg;
ASSERT_RTNL();
vg = br_vlan_group(br);
__vlan_flush(br, NULL, vg);
RCU_INIT_POINTER(br->vlgrp, NULL);
synchronize_net();
__vlan_group_free(vg);
}
struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
{
if (!vg)
return NULL;
return br_vlan_lookup(&vg->vlan_hash, vid);
}
/* Must be protected by RTNL. */
static void recalculate_group_addr(struct net_bridge *br)
{
if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
return;
spin_lock_bh(&br->lock);
if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
br->vlan_proto == htons(ETH_P_8021Q)) {
/* Bridge Group Address */
br->group_addr[5] = 0x00;
} else { /* vlan_enabled && ETH_P_8021AD */
/* Provider Bridge Group Address */
br->group_addr[5] = 0x08;
}
spin_unlock_bh(&br->lock);
}
/* Must be protected by RTNL. */
void br_recalculate_fwd_mask(struct net_bridge *br)
{
if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
br->vlan_proto == htons(ETH_P_8021Q))
br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
else /* vlan_enabled && ETH_P_8021AD */
br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
~(1u << br->group_addr[5]);
}
int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val,
struct netlink_ext_ack *extack)
{
struct switchdev_attr attr = {
.orig_dev = br->dev,
.id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
.u.vlan_filtering = val,
};
int err;
if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
return 0;
br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
err = switchdev_port_attr_set(br->dev, &attr, extack);
if (err && err != -EOPNOTSUPP) {
br_opt_toggle(br, BROPT_VLAN_ENABLED, !val);
return err;
}
br_manage_promisc(br);
recalculate_group_addr(br);
br_recalculate_fwd_mask(br);
if (!val && br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
br_info(br, "vlan filtering disabled, automatically disabling multicast vlan snooping\n");
br_multicast_toggle_vlan_snooping(br, false, NULL);
}
return 0;
}
bool br_vlan_enabled(const struct net_device *dev)
{
struct net_bridge *br = netdev_priv(dev);
return br_opt_get(br, BROPT_VLAN_ENABLED);
}
EXPORT_SYMBOL_GPL(br_vlan_enabled);
int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto)
{
struct net_bridge *br = netdev_priv(dev);
*p_proto = ntohs(br->vlan_proto);
return 0;
}
EXPORT_SYMBOL_GPL(br_vlan_get_proto);
int __br_vlan_set_proto(struct net_bridge *br, __be16 proto,
struct netlink_ext_ack *extack)
{
struct switchdev_attr attr = {
.orig_dev = br->dev,
.id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
.u.vlan_protocol = ntohs(proto),
};
int err = 0;
struct net_bridge_port *p;
struct net_bridge_vlan *vlan;
struct net_bridge_vlan_group *vg;
__be16 oldproto = br->vlan_proto;
if (br->vlan_proto == proto)
return 0;
err = switchdev_port_attr_set(br->dev, &attr, extack);
if (err && err != -EOPNOTSUPP)
return err;
/* Add VLANs for the new proto to the device filter. */
list_for_each_entry(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
list_for_each_entry(vlan, &vg->vlan_list, vlist) {
if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
continue;
err = vlan_vid_add(p->dev, proto, vlan->vid);
if (err)
goto err_filt;
}
}
br->vlan_proto = proto;
recalculate_group_addr(br);
br_recalculate_fwd_mask(br);
/* Delete VLANs for the old proto from the device filter. */
list_for_each_entry(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
list_for_each_entry(vlan, &vg->vlan_list, vlist) {
if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
continue;
vlan_vid_del(p->dev, oldproto, vlan->vid);
}
}
return 0;
err_filt:
attr.u.vlan_protocol = ntohs(oldproto);
switchdev_port_attr_set(br->dev, &attr, NULL);
list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist) {
if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
continue;
vlan_vid_del(p->dev, proto, vlan->vid);
}
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) {
if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
continue;
vlan_vid_del(p->dev, proto, vlan->vid);
}
}
return err;
}
int br_vlan_set_proto(struct net_bridge *br, unsigned long val,
struct netlink_ext_ack *extack)
{
if (!eth_type_vlan(htons(val)))
return -EPROTONOSUPPORT;
return __br_vlan_set_proto(br, htons(val), extack);
}
int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
{
switch (val) {
case 0:
case 1:
br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
break;
default:
return -EINVAL;
}
return 0;
}
int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val)
{
struct net_bridge_port *p;
/* allow to change the option if there are no port vlans configured */
list_for_each_entry(p, &br->port_list, list) {
struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
if (vg->num_vlans)
return -EBUSY;
}
switch (val) {
case 0:
case 1:
br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val);
break;
default:
return -EINVAL;
}
return 0;
}
static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
{
struct net_bridge_vlan *v;
if (vid != vg->pvid)
return false;
v = br_vlan_lookup(&vg->vlan_hash, vid);
if (v && br_vlan_should_use(v) &&
(v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
return true;
return false;
}
static void br_vlan_disable_default_pvid(struct net_bridge *br)
{
struct net_bridge_port *p;
u16 pvid = br->default_pvid;
/* Disable default_pvid on all ports where it is still
* configured.
*/
if (vlan_default_pvid(br_vlan_group(br), pvid)) {
if (!br_vlan_delete(br, pvid))
br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
}
list_for_each_entry(p, &br->port_list, list) {
if (vlan_default_pvid(nbp_vlan_group(p), pvid) &&
!nbp_vlan_delete(p, pvid))
br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
}
br->default_pvid = 0;
}
int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
struct netlink_ext_ack *extack)
{
const struct net_bridge_vlan *pvent;
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
unsigned long *changed;
bool vlchange;
u16 old_pvid;
int err = 0;
if (!pvid) {
br_vlan_disable_default_pvid(br);
return 0;
}
changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
if (!changed)
return -ENOMEM;
old_pvid = br->default_pvid;
/* Update default_pvid config only if we do not conflict with
* user configuration.
*/
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 |
BRIDGE_VLAN_INFO_UNTAGGED |
BRIDGE_VLAN_INFO_BRENTRY,
&vlchange, extack);
if (err)
goto out;
if (br_vlan_delete(br, old_pvid))
br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN);
br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN);
__set_bit(0, changed);
}
list_for_each_entry(p, &br->port_list, list) {
/* Update default_pvid config only if we do not conflict with
* user configuration.
*/
vg = nbp_vlan_group(p);
if ((old_pvid &&
!vlan_default_pvid(vg, old_pvid)) ||
br_vlan_find(vg, pvid))
continue;
err = nbp_vlan_add(p, pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED,
&vlchange, extack);
if (err)
goto err_port;
if (nbp_vlan_delete(p, old_pvid))
br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN);
br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN);
__set_bit(p->port_no, changed);
}
br->default_pvid = pvid;
out:
bitmap_free(changed);
return err;
err_port:
list_for_each_entry_continue_reverse(p, &br->port_list, list) {
if (!test_bit(p->port_no, changed))
continue;
if (old_pvid) {
nbp_vlan_add(p, old_pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED,
&vlchange, NULL);
br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN);
}
nbp_vlan_delete(p, pvid);
br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
}
if (test_bit(0, changed)) {
if (old_pvid) {
br_vlan_add(br, old_pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED |
BRIDGE_VLAN_INFO_BRENTRY,
&vlchange, NULL);
br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN);
}
br_vlan_delete(br, pvid);
br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
}
goto out;
}
int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val,
struct netlink_ext_ack *extack)
{
u16 pvid = val;
int err = 0;
if (val >= VLAN_VID_MASK)
return -EINVAL;
if (pvid == br->default_pvid)
goto out;
/* Only allow default pvid change when filtering is disabled */
if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
pr_info_once("Please disable vlan filtering to change default_pvid\n");
err = -EPERM;
goto out;
}
err = __br_vlan_set_default_pvid(br, pvid, extack);
out:
return err;
}
int br_vlan_init(struct net_bridge *br)
{
struct net_bridge_vlan_group *vg;
int ret = -ENOMEM;
vg = kzalloc(sizeof(*vg), GFP_KERNEL);
if (!vg)
goto out;
ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
if (ret)
goto err_rhtbl;
ret = vlan_tunnel_init(vg);
if (ret)
goto err_tunnel_init;
INIT_LIST_HEAD(&vg->vlan_list);
br->vlan_proto = htons(ETH_P_8021Q);
br->default_pvid = 1;
rcu_assign_pointer(br->vlgrp, vg);
out:
return ret;
err_tunnel_init:
rhashtable_destroy(&vg->vlan_hash);
err_rhtbl:
kfree(vg);
goto out;
}
int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
{
struct switchdev_attr attr = {
.orig_dev = p->br->dev,
.id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
.u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
};
struct net_bridge_vlan_group *vg;
int ret = -ENOMEM;
vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
if (!vg)
goto out;
ret = switchdev_port_attr_set(p->dev, &attr, extack);
if (ret && ret != -EOPNOTSUPP)
goto err_vlan_enabled;
ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
if (ret)
goto err_rhtbl;
ret = vlan_tunnel_init(vg);
if (ret)
goto err_tunnel_init;
INIT_LIST_HEAD(&vg->vlan_list);
rcu_assign_pointer(p->vlgrp, vg);
if (p->br->default_pvid) {
bool changed;
ret = nbp_vlan_add(p, p->br->default_pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED,
&changed, extack);
if (ret)
goto err_vlan_add;
br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN);
}
out:
return ret;
err_vlan_add:
RCU_INIT_POINTER(p->vlgrp, NULL);
synchronize_rcu();
vlan_tunnel_deinit(vg);
err_tunnel_init:
rhashtable_destroy(&vg->vlan_hash);
err_rhtbl:
err_vlan_enabled:
kfree(vg);
goto out;
}
/* Must be protected by RTNL.
* Must be called with vid in range from 1 to 4094 inclusive.
* changed must be true only if the vlan was created or updated
*/
int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
bool *changed, struct netlink_ext_ack *extack)
{
struct net_bridge_vlan *vlan;
int ret;
ASSERT_RTNL();
*changed = false;
vlan = br_vlan_find(nbp_vlan_group(port), vid);
if (vlan) {
bool would_change = __vlan_flags_would_change(vlan, flags);
if (would_change) {
/* Pass the flags to the hardware bridge */
ret = br_switchdev_port_vlan_add(port->dev, vid, flags,
true, extack);
if (ret && ret != -EOPNOTSUPP)
return ret;
}
__vlan_flags_commit(vlan, flags);
*changed = would_change;
return 0;
}
vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
if (!vlan)
return -ENOMEM;
vlan->vid = vid;
vlan->port = port;
ret = __vlan_add(vlan, flags, extack);
if (ret)
kfree(vlan);
else
*changed = true;
return ret;
}
/* Must be protected by RTNL.
* Must be called with vid in range from 1 to 4094 inclusive.
*/
int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
{
struct net_bridge_vlan *v;
ASSERT_RTNL();
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);
br_fdb_delete_by_port(port->br, port, vid, 0);
return __vlan_del(v);
}
void nbp_vlan_flush(struct net_bridge_port *port)
{
struct net_bridge_vlan_group *vg;
ASSERT_RTNL();
vg = nbp_vlan_group(port);
__vlan_flush(port->br, port, vg);
RCU_INIT_POINTER(port->vlgrp, NULL);
synchronize_net();
__vlan_group_free(vg);
}
void br_vlan_get_stats(const struct net_bridge_vlan *v,
struct pcpu_sw_netstats *stats)
{
int i;
memset(stats, 0, sizeof(*stats));
for_each_possible_cpu(i) {
u64 rxpackets, rxbytes, txpackets, txbytes;
struct pcpu_sw_netstats *cpu_stats;
unsigned int start;
cpu_stats = per_cpu_ptr(v->stats, i);
do {
start = u64_stats_fetch_begin(&cpu_stats->syncp);
rxpackets = u64_stats_read(&cpu_stats->rx_packets);
rxbytes = u64_stats_read(&cpu_stats->rx_bytes);
txbytes = u64_stats_read(&cpu_stats->tx_bytes);
txpackets = u64_stats_read(&cpu_stats->tx_packets);
} while (u64_stats_fetch_retry(&cpu_stats->syncp, start));
u64_stats_add(&stats->rx_packets, rxpackets);
u64_stats_add(&stats->rx_bytes, rxbytes);
u64_stats_add(&stats->tx_bytes, txbytes);
u64_stats_add(&stats->tx_packets, txpackets);
}
}
int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
ASSERT_RTNL();
p = br_port_get_check_rtnl(dev);
if (p)
vg = nbp_vlan_group(p);
else if (netif_is_bridge_master(dev))
vg = br_vlan_group(netdev_priv(dev));
else
return -EINVAL;
*p_pvid = br_get_pvid(vg);
return 0;
}
EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
p = br_port_get_check_rcu(dev);
if (p)
vg = nbp_vlan_group_rcu(p);
else if (netif_is_bridge_master(dev))
vg = br_vlan_group_rcu(netdev_priv(dev));
else
return -EINVAL;
*p_pvid = br_get_pvid(vg);
return 0;
}
EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu);
void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
struct net_device_path_ctx *ctx,
struct net_device_path *path)
{
struct net_bridge_vlan_group *vg;
int idx = ctx->num_vlans - 1;
u16 vid;
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
if (!br_opt_get(br, BROPT_VLAN_ENABLED))
return;
vg = br_vlan_group(br);
if (idx >= 0 &&
ctx->vlan[idx].proto == br->vlan_proto) {
vid = ctx->vlan[idx].id;
} else {
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_TAG;
vid = br_get_pvid(vg);
}
path->bridge.vlan_id = vid;
path->bridge.vlan_proto = br->vlan_proto;
}
int br_vlan_fill_forward_path_mode(struct net_bridge *br,
struct net_bridge_port *dst,
struct net_device_path *path)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
if (!br_opt_get(br, BROPT_VLAN_ENABLED))
return 0;
vg = nbp_vlan_group_rcu(dst);
v = br_vlan_find(vg, path->bridge.vlan_id);
if (!v || !br_vlan_should_use(v))
return -EINVAL;
if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
return 0;
if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG)
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW;
else
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG;
return 0;
}
int br_vlan_get_info(const struct net_device *dev, u16 vid,
struct bridge_vlan_info *p_vinfo)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
struct net_bridge_port *p;
ASSERT_RTNL();
p = br_port_get_check_rtnl(dev);
if (p)
vg = nbp_vlan_group(p);
else if (netif_is_bridge_master(dev))
vg = br_vlan_group(netdev_priv(dev));
else
return -EINVAL;
v = br_vlan_find(vg, vid);
if (!v)
return -ENOENT;
p_vinfo->vid = vid;
p_vinfo->flags = v->flags;
if (vid == br_get_pvid(vg))
p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
return 0;
}
EXPORT_SYMBOL_GPL(br_vlan_get_info);
int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
struct bridge_vlan_info *p_vinfo)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
struct net_bridge_port *p;
p = br_port_get_check_rcu(dev);
if (p)
vg = nbp_vlan_group_rcu(p);
else if (netif_is_bridge_master(dev))
vg = br_vlan_group_rcu(netdev_priv(dev));
else
return -EINVAL;
v = br_vlan_find(vg, vid);
if (!v)
return -ENOENT;
p_vinfo->vid = vid;
p_vinfo->flags = v->flags;
if (vid == br_get_pvid(vg))
p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
return 0;
}
EXPORT_SYMBOL_GPL(br_vlan_get_info_rcu);
static int br_vlan_is_bind_vlan_dev(const struct net_device *dev)
{
return is_vlan_dev(dev) &&
!!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING);
}
static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev,
__always_unused struct netdev_nested_priv *priv)
{
return br_vlan_is_bind_vlan_dev(dev);
}
static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev)
{
int found;
rcu_read_lock();
found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn,
NULL);
rcu_read_unlock();
return !!found;
}
struct br_vlan_bind_walk_data {
u16 vid;
struct net_device *result;
};
static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
struct netdev_nested_priv *priv)
{
struct br_vlan_bind_walk_data *data = priv->data;
int found = 0;
if (br_vlan_is_bind_vlan_dev(dev) &&
vlan_dev_priv(dev)->vlan_id == data->vid) {
data->result = dev;
found = 1;
}
return found;
}
static struct net_device *
br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
{
struct br_vlan_bind_walk_data data = {
.vid = vid,
};
struct netdev_nested_priv priv = {
.data = (void *)&data,
};
rcu_read_lock();
netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
&priv);
rcu_read_unlock();
return data.result;
}
static bool br_vlan_is_dev_up(const struct net_device *dev)
{
return !!(dev->flags & IFF_UP) && netif_oper_up(dev);
}
static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
struct net_device *vlan_dev)
{
u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
bool has_carrier = false;
if (!netif_carrier_ok(br->dev)) {
netif_carrier_off(vlan_dev);
return;
}
list_for_each_entry(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
has_carrier = true;
break;
}
}
if (has_carrier)
netif_carrier_on(vlan_dev);
else
netif_carrier_off(vlan_dev);
}
static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
{
struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
struct net_bridge_vlan *vlan;
struct net_device *vlan_dev;
list_for_each_entry(vlan, &vg->vlan_list, vlist) {
vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
vlan->vid);
if (vlan_dev) {
if (br_vlan_is_dev_up(p->dev)) {
if (netif_carrier_ok(p->br->dev))
netif_carrier_on(vlan_dev);
} else {
br_vlan_set_vlan_dev_state(p->br, vlan_dev);
}
}
}
}
static void br_vlan_upper_change(struct net_device *dev,
struct net_device *upper_dev,
bool linking)
{
struct net_bridge *br = netdev_priv(dev);
if (!br_vlan_is_bind_vlan_dev(upper_dev))
return;
if (linking) {
br_vlan_set_vlan_dev_state(br, upper_dev);
br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true);
} else {
br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING,
br_vlan_has_upper_bind_vlan_dev(dev));
}
}
struct br_vlan_link_state_walk_data {
struct net_bridge *br;
};
static int br_vlan_link_state_change_fn(struct net_device *vlan_dev,
struct netdev_nested_priv *priv)
{
struct br_vlan_link_state_walk_data *data = priv->data;
if (br_vlan_is_bind_vlan_dev(vlan_dev))
br_vlan_set_vlan_dev_state(data->br, vlan_dev);
return 0;
}
static void br_vlan_link_state_change(struct net_device *dev,
struct net_bridge *br)
{
struct br_vlan_link_state_walk_data data = {
.br = br
};
struct netdev_nested_priv priv = {
.data = (void *)&data,
};
rcu_read_lock();
netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn,
&priv);
rcu_read_unlock();
}
/* Must be protected by RTNL. */
static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
{
struct net_device *vlan_dev;
if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
return;
vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
if (vlan_dev)
br_vlan_set_vlan_dev_state(p->br, vlan_dev);
}
/* Must be protected by RTNL. */
int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
{
struct netdev_notifier_changeupper_info *info;
struct net_bridge *br = netdev_priv(dev);
int vlcmd = 0, ret = 0;
bool changed = false;
switch (event) {
case NETDEV_REGISTER:
ret = br_vlan_add(br, br->default_pvid,
BRIDGE_VLAN_INFO_PVID |
BRIDGE_VLAN_INFO_UNTAGGED |
BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
vlcmd = RTM_NEWVLAN;
break;
case NETDEV_UNREGISTER:
changed = !br_vlan_delete(br, br->default_pvid);
vlcmd = RTM_DELVLAN;
break;
case NETDEV_CHANGEUPPER:
info = ptr;
br_vlan_upper_change(dev, info->upper_dev, info->linking);
break;
case NETDEV_CHANGE:
case NETDEV_UP:
if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING))
break;
br_vlan_link_state_change(dev, br);
break;
}
if (changed)
br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd);
return ret;
}
/* Must be protected by RTNL. */
void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
{
if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
return;
switch (event) {
case NETDEV_CHANGE:
case NETDEV_DOWN:
case NETDEV_UP:
br_vlan_set_all_vlan_dev_state(p);
break;
}
}
static bool br_vlan_stats_fill(struct sk_buff *skb,
const struct net_bridge_vlan *v)
{
struct pcpu_sw_netstats stats;
struct nlattr *nest;
nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_STATS);
if (!nest)
return false;
br_vlan_get_stats(v, &stats);
if (nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_BYTES,
u64_stats_read(&stats.rx_bytes),
BRIDGE_VLANDB_STATS_PAD) ||
nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_PACKETS,
u64_stats_read(&stats.rx_packets),
BRIDGE_VLANDB_STATS_PAD) ||
nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_BYTES,
u64_stats_read(&stats.tx_bytes),
BRIDGE_VLANDB_STATS_PAD) ||
nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_PACKETS,
u64_stats_read(&stats.tx_packets),
BRIDGE_VLANDB_STATS_PAD))
goto out_err;
nla_nest_end(skb, nest);
return true;
out_err:
nla_nest_cancel(skb, nest);
return false;
}
/* v_opts is used to dump the options which must be equal in the whole range */
static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range,
const struct net_bridge_vlan *v_opts,
const struct net_bridge_port *p,
u16 flags,
bool dump_stats)
{
struct bridge_vlan_info info;
struct nlattr *nest;
nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY);
if (!nest)
return false;
memset(&info, 0, sizeof(info));
info.vid = vid;
if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
info.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
if (flags & BRIDGE_VLAN_INFO_PVID)
info.flags |= BRIDGE_VLAN_INFO_PVID;
if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info))
goto out_err;
if (vid_range && vid < vid_range &&
!(flags & BRIDGE_VLAN_INFO_PVID) &&
nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range))
goto out_err;
if (v_opts) {
if (!br_vlan_opts_fill(skb, v_opts, p))
goto out_err;
if (dump_stats && !br_vlan_stats_fill(skb, v_opts))
goto out_err;
}
nla_nest_end(skb, nest);
return true;
out_err:
nla_nest_cancel(skb, nest);
return false;
}
static size_t rtnl_vlan_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct br_vlan_msg))
+ nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */
+ nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */
+ nla_total_size(sizeof(struct bridge_vlan_info)) /* BRIDGE_VLANDB_ENTRY_INFO */
+ br_vlan_opts_nl_size(); /* bridge vlan options */
}
void br_vlan_notify(const struct net_bridge *br,
const struct net_bridge_port *p,
u16 vid, u16 vid_range,
int cmd)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v = NULL;
struct br_vlan_msg *bvm;
struct nlmsghdr *nlh;
struct sk_buff *skb;
int err = -ENOBUFS;
struct net *net;
u16 flags = 0;
int ifindex;
/* right now notifications are done only with rtnl held */
ASSERT_RTNL();
if (p) {
ifindex = p->dev->ifindex;
vg = nbp_vlan_group(p);
net = dev_net(p->dev);
} else {
ifindex = br->dev->ifindex;
vg = br_vlan_group(br);
net = dev_net(br->dev);
}
skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL);
if (!skb)
goto out_err;
err = -EMSGSIZE;
nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0);
if (!nlh)
goto out_err;
bvm = nlmsg_data(nlh);
memset(bvm, 0, sizeof(*bvm));
bvm->family = AF_BRIDGE;
bvm->ifindex = ifindex;
switch (cmd) {
case RTM_NEWVLAN:
/* need to find the vlan due to flags/options */
v = br_vlan_find(vg, vid);
if (!v || !br_vlan_should_use(v))
goto out_kfree;
flags = v->flags;
if (br_get_pvid(vg) == v->vid)
flags |= BRIDGE_VLAN_INFO_PVID;
break;
case RTM_DELVLAN:
break;
default:
goto out_kfree;
}
if (!br_vlan_fill_vids(skb, vid, vid_range, v, p, flags, false))
goto out_err;
nlmsg_end(skb, nlh);
rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL);
return;
out_err:
rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err);
out_kfree:
kfree_skb(skb);
}
/* check if v_curr can enter a range ending in range_end */
bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
const struct net_bridge_vlan *range_end)
{
return v_curr->vid - range_end->vid == 1 &&
range_end->flags == v_curr->flags &&
br_vlan_opts_eq_range(v_curr, range_end);
}
static int br_vlan_dump_dev(const struct net_device *dev,
struct sk_buff *skb,
struct netlink_callback *cb,
u32 dump_flags)
{
struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL;
bool dump_global = !!(dump_flags & BRIDGE_VLANDB_DUMPF_GLOBAL);
bool dump_stats = !!(dump_flags & BRIDGE_VLANDB_DUMPF_STATS);
struct net_bridge_vlan_group *vg;
int idx = 0, s_idx = cb->args[1];
struct nlmsghdr *nlh = NULL;
struct net_bridge_port *p;
struct br_vlan_msg *bvm;
struct net_bridge *br;
int err = 0;
u16 pvid;
if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev))
return -EINVAL;
if (netif_is_bridge_master(dev)) {
br = netdev_priv(dev);
vg = br_vlan_group_rcu(br);
p = NULL;
} else {
/* global options are dumped only for bridge devices */
if (dump_global)
return 0;
p = br_port_get_rcu(dev);
if (WARN_ON(!p))
return -EINVAL;
vg = nbp_vlan_group_rcu(p);
br = p->br;
}
if (!vg)
return 0;
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI);
if (!nlh)
return -EMSGSIZE;
bvm = nlmsg_data(nlh);
memset(bvm, 0, sizeof(*bvm));
bvm->family = PF_BRIDGE;
bvm->ifindex = dev->ifindex;
pvid = br_get_pvid(vg);
/* idx must stay at range's beginning until it is filled in */
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
if (!dump_global && !br_vlan_should_use(v))
continue;
if (idx < s_idx) {
idx++;
continue;
}
if (!range_start) {
range_start = v;
range_end = v;
continue;
}
if (dump_global) {
if (br_vlan_global_opts_can_enter_range(v, range_end))
goto update_end;
if (!br_vlan_global_opts_fill(skb, range_start->vid,
range_end->vid,
range_start)) {
err = -EMSGSIZE;
break;
}
/* advance number of filled vlans */
idx += range_end->vid - range_start->vid + 1;
range_start = v;
} else if (dump_stats || v->vid == pvid ||
!br_vlan_can_enter_range(v, range_end)) {
u16 vlan_flags = br_vlan_flags(range_start, pvid);
if (!br_vlan_fill_vids(skb, range_start->vid,
range_end->vid, range_start,
p, vlan_flags, dump_stats)) {
err = -EMSGSIZE;
break;
}
/* advance number of filled vlans */
idx += range_end->vid - range_start->vid + 1;
range_start = v;
}
update_end:
range_end = v;
}
/* err will be 0 and range_start will be set in 3 cases here:
* - first vlan (range_start == range_end)
* - last vlan (range_start == range_end, not in range)
* - last vlan range (range_start != range_end, in range)
*/
if (!err && range_start) {
if (dump_global &&
!br_vlan_global_opts_fill(skb, range_start->vid,
range_end->vid, range_start))
err = -EMSGSIZE;
else if (!dump_global &&
!br_vlan_fill_vids(skb, range_start->vid,
range_end->vid, range_start,
p, br_vlan_flags(range_start, pvid),
dump_stats))
err = -EMSGSIZE;
}
cb->args[1] = err ? idx : 0;
nlmsg_end(skb, nlh);
return err;
}
static const struct nla_policy br_vlan_db_dump_pol[BRIDGE_VLANDB_DUMP_MAX + 1] = {
[BRIDGE_VLANDB_DUMP_FLAGS] = { .type = NLA_U32 },
};
static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nlattr *dtb[BRIDGE_VLANDB_DUMP_MAX + 1];
int idx = 0, err = 0, s_idx = cb->args[0];
struct net *net = sock_net(skb->sk);
struct br_vlan_msg *bvm;
struct net_device *dev;
u32 dump_flags = 0;
err = nlmsg_parse(cb->nlh, sizeof(*bvm), dtb, BRIDGE_VLANDB_DUMP_MAX,
br_vlan_db_dump_pol, cb->extack);
if (err < 0)
return err;
bvm = nlmsg_data(cb->nlh);
if (dtb[BRIDGE_VLANDB_DUMP_FLAGS])
dump_flags = nla_get_u32(dtb[BRIDGE_VLANDB_DUMP_FLAGS]);
rcu_read_lock();
if (bvm->ifindex) {
dev = dev_get_by_index_rcu(net, bvm->ifindex);
if (!dev) {
err = -ENODEV;
goto out_err;
}
err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
/* if the dump completed without an error we return 0 here */
if (err != -EMSGSIZE)
goto out_err;
} else {
for_each_netdev_rcu(net, dev) {
if (idx < s_idx)
goto skip;
err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
if (err == -EMSGSIZE)
break;
skip:
idx++;
}
}
cb->args[0] = idx;
rcu_read_unlock();
return skb->len;
out_err:
rcu_read_unlock();
return err;
}
static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = {
[BRIDGE_VLANDB_ENTRY_INFO] =
NLA_POLICY_EXACT_LEN(sizeof(struct bridge_vlan_info)),
[BRIDGE_VLANDB_ENTRY_RANGE] = { .type = NLA_U16 },
[BRIDGE_VLANDB_ENTRY_STATE] = { .type = NLA_U8 },
[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED },
[BRIDGE_VLANDB_ENTRY_MCAST_ROUTER] = { .type = NLA_U8 },
[BRIDGE_VLANDB_ENTRY_MCAST_N_GROUPS] = { .type = NLA_REJECT },
[BRIDGE_VLANDB_ENTRY_MCAST_MAX_GROUPS] = { .type = NLA_U32 },
[BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS] = NLA_POLICY_MAX(NLA_U8, 1),
};
static int br_vlan_rtm_process_one(struct net_device *dev,
const struct nlattr *attr,
int cmd, struct netlink_ext_ack *extack)
{
struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL;
struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1];
bool changed = false, skip_processing = false;
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p = NULL;
int err = 0, cmdmap = 0;
struct net_bridge *br;
if (netif_is_bridge_master(dev)) {
br = netdev_priv(dev);
vg = br_vlan_group(br);
} else {
p = br_port_get_rtnl(dev);
if (WARN_ON(!p))
return -ENODEV;
br = p->br;
vg = nbp_vlan_group(p);
}
if (WARN_ON(!vg))
return -ENODEV;
err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr,
br_vlan_db_policy, extack);
if (err)
return err;
if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) {
NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info");
return -EINVAL;
}
memset(&vrange_end, 0, sizeof(vrange_end));
vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
BRIDGE_VLAN_INFO_RANGE_END)) {
NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls");
return -EINVAL;
}
if (!br_vlan_valid_id(vinfo->vid, extack))
return -EINVAL;
if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) {
vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]);
/* validate user-provided flags without RANGE_BEGIN */
vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags;
vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
/* vinfo_last is the range start, vinfo the range end */
vinfo_last = vinfo;
vinfo = &vrange_end;
if (!br_vlan_valid_id(vinfo->vid, extack) ||
!br_vlan_valid_range(vinfo, vinfo_last, extack))
return -EINVAL;
}
switch (cmd) {
case RTM_NEWVLAN:
cmdmap = RTM_SETLINK;
skip_processing = !!(vinfo->flags & BRIDGE_VLAN_INFO_ONLY_OPTS);
break;
case RTM_DELVLAN:
cmdmap = RTM_DELLINK;
break;
}
if (!skip_processing) {
struct bridge_vlan_info *tmp_last = vinfo_last;
/* br_process_vlan_info may overwrite vinfo_last */
err = br_process_vlan_info(br, p, cmdmap, vinfo, &tmp_last,
&changed, extack);
/* notify first if anything changed */
if (changed)
br_ifinfo_notify(cmdmap, br, p);
if (err)
return err;
}
/* deal with options */
if (cmd == RTM_NEWVLAN) {
struct net_bridge_vlan *range_start, *range_end;
if (vinfo_last) {
range_start = br_vlan_find(vg, vinfo_last->vid);
range_end = br_vlan_find(vg, vinfo->vid);
} else {
range_start = br_vlan_find(vg, vinfo->vid);
range_end = range_start;
}
err = br_vlan_process_options(br, p, range_start, range_end,
tb, extack);
}
return err;
}
static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct br_vlan_msg *bvm;
struct net_device *dev;
struct nlattr *attr;
int err, vlans = 0;
int rem;
/* this should validate the header and check for remaining bytes */
err = nlmsg_parse(nlh, sizeof(*bvm), NULL, BRIDGE_VLANDB_MAX, NULL,
extack);
if (err < 0)
return err;
bvm = nlmsg_data(nlh);
dev = __dev_get_by_index(net, bvm->ifindex);
if (!dev)
return -ENODEV;
if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port");
return -EINVAL;
}
nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) {
switch (nla_type(attr)) {
case BRIDGE_VLANDB_ENTRY:
err = br_vlan_rtm_process_one(dev, attr,
nlh->nlmsg_type,
extack);
break;
case BRIDGE_VLANDB_GLOBAL_OPTIONS:
err = br_vlan_rtm_process_global_options(dev, attr,
nlh->nlmsg_type,
extack);
break;
default:
continue;
}
vlans++;
if (err)
break;
}
if (!vlans) {
NL_SET_ERR_MSG_MOD(extack, "No vlans found to process");
err = -EINVAL;
}
return err;
}
static const struct rtnl_msg_handler br_vlan_rtnl_msg_handlers[] = {
{THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN, br_vlan_rtm_process, NULL, 0},
{THIS_MODULE, PF_BRIDGE, RTM_DELVLAN, br_vlan_rtm_process, NULL, 0},
{THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL, br_vlan_rtm_dump, 0},
};
int br_vlan_rtnl_init(void)
{
return rtnl_register_many(br_vlan_rtnl_msg_handlers);
}
void br_vlan_rtnl_uninit(void)
{
rtnl_unregister_many(br_vlan_rtnl_msg_handlers);
}
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