Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-13 23:51:39 +00:00
Code Issues Packages Projects Releases Wiki Activity
8b5ccc9743
linux/net/bridge/br_vlan.c
Eric Dumazet 48ebf6ebbc bridge: vlan: use synchronize_net() when holding RTNL 
br_vlan_flush() and nbp_vlan_flush() should use synchronize_net()
instead of syncronize_rcu() to release RTNL sooner.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-12 12:17:02 +00:00

2315 lines
55 KiB
C
Raw Blame History

// 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;
}
void br_vlan_rtnl_init(void)
{
rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL,
br_vlan_rtm_dump, 0);
rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN,
br_vlan_rtm_process, NULL, 0);
rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN,
br_vlan_rtm_process, NULL, 0);
}
void br_vlan_rtnl_uninit(void)
{
rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN);
rtnl_unregister(PF_BRIDGE, RTM_DELVLAN);
}
Reference in New Issue View Git Blame Copy Permalink