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-rw-r--r--include/uapi/linux/neighbour.h11
-rw-r--r--net/bridge/br_fdb.c117
-rw-r--r--net/bridge/br_private.h4
3 files changed, 119 insertions, 13 deletions
diff --git a/include/uapi/linux/neighbour.h b/include/uapi/linux/neighbour.h
index 540ff48402a1..21e569297355 100644
--- a/include/uapi/linux/neighbour.h
+++ b/include/uapi/linux/neighbour.h
@@ -173,13 +173,24 @@ enum {
};
#define NDTA_MAX (__NDTA_MAX - 1)
+ /* FDB activity notification bits used in NFEA_ACTIVITY_NOTIFY:
+ * - FDB_NOTIFY_BIT - notify on activity/expire for any entry
+ * - FDB_NOTIFY_INACTIVE_BIT - mark as inactive to avoid multiple notifications
+ */
+enum {
+ FDB_NOTIFY_BIT = (1 << 0),
+ FDB_NOTIFY_INACTIVE_BIT = (1 << 1)
+};
+
/* embedded into NDA_FDB_EXT_ATTRS:
* [NDA_FDB_EXT_ATTRS] = {
+ * [NFEA_ACTIVITY_NOTIFY]
* ...
* }
*/
enum {
NFEA_UNSPEC,
+ NFEA_ACTIVITY_NOTIFY,
__NFEA_MAX
};
#define NFEA_MAX (__NFEA_MAX - 1)
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index ed80d9ab0fb9..642deb57c064 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -349,12 +349,21 @@ void br_fdb_cleanup(struct work_struct *work)
*/
rcu_read_lock();
hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
- unsigned long this_timer;
+ unsigned long this_timer = f->updated + delay;
if (test_bit(BR_FDB_STATIC, &f->flags) ||
- test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags))
+ test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
+ if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
+ if (time_after(this_timer, now))
+ work_delay = min(work_delay,
+ this_timer - now);
+ else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE,
+ &f->flags))
+ fdb_notify(br, f, RTM_NEWNEIGH, false);
+ }
continue;
- this_timer = f->updated + delay;
+ }
+
if (time_after(this_timer, now)) {
work_delay = min(work_delay, this_timer - now);
} else {
@@ -556,11 +565,17 @@ int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
return ret;
}
+/* returns true if the fdb was modified */
+static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb)
+{
+ return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) &&
+ test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags));
+}
+
void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid, unsigned long flags)
{
struct net_bridge_fdb_entry *fdb;
- bool fdb_modified = false;
/* some users want to always flood. */
if (hold_time(br) == 0)
@@ -575,6 +590,12 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
source->dev->name, addr, vid);
} else {
unsigned long now = jiffies;
+ bool fdb_modified = false;
+
+ if (now != fdb->updated) {
+ fdb->updated = now;
+ fdb_modified = __fdb_mark_active(fdb);
+ }
/* fastpath: update of existing entry */
if (unlikely(source != fdb->dst &&
@@ -587,8 +608,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
&fdb->flags);
}
- if (now != fdb->updated)
- fdb->updated = now;
+
if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags)))
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
if (unlikely(fdb_modified)) {
@@ -667,6 +687,23 @@ static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
&fdb->key.vlan_id))
goto nla_put_failure;
+ if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
+ struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
+ u8 notify_bits = FDB_NOTIFY_BIT;
+
+ if (!nest)
+ goto nla_put_failure;
+ if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
+ notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
+
+ if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
+ nla_nest_cancel(skb, nest);
+ goto nla_put_failure;
+ }
+
+ nla_nest_end(skb, nest);
+ }
+
nlmsg_end(skb, nlh);
return 0;
@@ -681,7 +718,9 @@ static inline size_t fdb_nlmsg_size(void)
+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
+ nla_total_size(sizeof(u32)) /* NDA_MASTER */
+ nla_total_size(sizeof(u16)) /* NDA_VLAN */
- + nla_total_size(sizeof(struct nda_cacheinfo));
+ + nla_total_size(sizeof(struct nda_cacheinfo))
+ + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
+ + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
}
static void fdb_notify(struct net_bridge *br,
@@ -791,14 +830,40 @@ errout:
return err;
}
+/* returns true if the fdb is modified */
+static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
+{
+ bool modified = false;
+
+ /* allow to mark an entry as inactive, usually done on creation */
+ if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
+ !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
+ modified = true;
+
+ if ((notify & FDB_NOTIFY_BIT) &&
+ !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
+ /* enabled activity tracking */
+ modified = true;
+ } else if (!(notify & FDB_NOTIFY_BIT) &&
+ test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
+ /* disabled activity tracking, clear notify state */
+ clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
+ modified = true;
+ }
+
+ return modified;
+}
+
/* Update (create or replace) forwarding database entry */
static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
- const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid)
+ const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
+ struct nlattr *nfea_tb[])
{
bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
struct net_bridge_fdb_entry *fdb;
u16 state = ndm->ndm_state;
bool modified = false;
+ u8 notify = 0;
/* If the port cannot learn allow only local and static entries */
if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
@@ -815,6 +880,13 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
if (is_sticky && (state & NUD_PERMANENT))
return -EINVAL;
+ if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
+ notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
+ if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
+ (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
+ return -EINVAL;
+ }
+
fdb = br_fdb_find(br, addr, vid);
if (fdb == NULL) {
if (!(flags & NLM_F_CREATE))
@@ -858,6 +930,9 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
modified = true;
}
+ if (fdb_handle_notify(fdb, notify))
+ modified = true;
+
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
fdb->used = jiffies;
@@ -871,7 +946,7 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
struct net_bridge_port *p, const unsigned char *addr,
- u16 nlh_flags, u16 vid)
+ u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[])
{
int err = 0;
@@ -893,19 +968,24 @@ static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
err = br_fdb_external_learn_add(br, p, addr, vid, true);
} else {
spin_lock_bh(&br->hash_lock);
- err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid);
+ err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
spin_unlock_bh(&br->hash_lock);
}
return err;
}
+static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
+ [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 },
+};
+
/* Add new permanent fdb entry with RTM_NEWNEIGH */
int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr, u16 vid, u16 nlh_flags,
struct netlink_ext_ack *extack)
{
+ struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p = NULL;
struct net_bridge_vlan *v;
@@ -938,6 +1018,16 @@ int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
vg = nbp_vlan_group(p);
}
+ if (tb[NDA_FDB_EXT_ATTRS]) {
+ attr = tb[NDA_FDB_EXT_ATTRS];
+ err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
+ br_nda_fdb_pol, extack);
+ if (err)
+ return err;
+ } else {
+ memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
+ }
+
if (vid) {
v = br_vlan_find(vg, vid);
if (!v || !br_vlan_should_use(v)) {
@@ -946,9 +1036,9 @@ int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
}
/* VID was specified, so use it. */
- err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
+ err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb);
} else {
- err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
+ err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb);
if (err || !vg || !vg->num_vlans)
goto out;
@@ -959,7 +1049,8 @@ int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
list_for_each_entry(v, &vg->vlan_list, vlist) {
if (!br_vlan_should_use(v))
continue;
- err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
+ err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
+ nfea_tb);
if (err)
goto out;
}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 7501be4eeba0..c0ae639e1b36 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -48,6 +48,8 @@ enum {
/* Path to usermode spanning tree program */
#define BR_STP_PROG "/sbin/bridge-stp"
+#define BR_FDB_NOTIFY_SETTABLE_BITS (FDB_NOTIFY_BIT | FDB_NOTIFY_INACTIVE_BIT)
+
typedef struct bridge_id bridge_id;
typedef struct mac_addr mac_addr;
typedef __u16 port_id;
@@ -184,6 +186,8 @@ enum {
BR_FDB_ADDED_BY_USER,
BR_FDB_ADDED_BY_EXT_LEARN,
BR_FDB_OFFLOADED,
+ BR_FDB_NOTIFY,
+ BR_FDB_NOTIFY_INACTIVE
};
struct net_bridge_fdb_key {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 19:25:07 +0000