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Diffstat (limited to 'net/bridge/br_fdb.c')
-rw-r--r--net/bridge/br_fdb.c106
1 files changed, 71 insertions, 35 deletions
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index c8e7861b88b0..5ba0c844d508 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -28,7 +28,8 @@
static struct kmem_cache *br_fdb_cache __read_mostly;
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr);
-static void fdb_notify(const struct net_bridge_fdb_entry *, int);
+static void fdb_notify(struct net_bridge *br,
+ const struct net_bridge_fdb_entry *, int);
static u32 fdb_salt __read_mostly;
@@ -80,10 +81,10 @@ static void fdb_rcu_free(struct rcu_head *head)
kmem_cache_free(br_fdb_cache, ent);
}
-static inline void fdb_delete(struct net_bridge_fdb_entry *f)
+static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
{
- fdb_notify(f, RTM_DELNEIGH);
hlist_del_rcu(&f->hlist);
+ fdb_notify(br, f, RTM_DELNEIGH);
call_rcu(&f->rcu, fdb_rcu_free);
}
@@ -114,7 +115,7 @@ void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
}
/* delete old one */
- fdb_delete(f);
+ fdb_delete(br, f);
goto insert;
}
}
@@ -126,6 +127,18 @@ void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
spin_unlock_bh(&br->hash_lock);
}
+void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
+{
+ struct net_bridge_fdb_entry *f;
+
+ /* If old entry was unassociated with any port, then delete it. */
+ f = __br_fdb_get(br, br->dev->dev_addr);
+ if (f && f->is_local && !f->dst)
+ fdb_delete(br, f);
+
+ fdb_insert(br, NULL, newaddr);
+}
+
void br_fdb_cleanup(unsigned long _data)
{
struct net_bridge *br = (struct net_bridge *)_data;
@@ -133,7 +146,7 @@ void br_fdb_cleanup(unsigned long _data)
unsigned long next_timer = jiffies + br->ageing_time;
int i;
- spin_lock_bh(&br->hash_lock);
+ spin_lock(&br->hash_lock);
for (i = 0; i < BR_HASH_SIZE; i++) {
struct net_bridge_fdb_entry *f;
struct hlist_node *h, *n;
@@ -144,12 +157,12 @@ void br_fdb_cleanup(unsigned long _data)
continue;
this_timer = f->updated + delay;
if (time_before_eq(this_timer, jiffies))
- fdb_delete(f);
+ fdb_delete(br, f);
else if (time_before(this_timer, next_timer))
next_timer = this_timer;
}
}
- spin_unlock_bh(&br->hash_lock);
+ spin_unlock(&br->hash_lock);
mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
}
@@ -165,7 +178,7 @@ void br_fdb_flush(struct net_bridge *br)
struct hlist_node *h, *n;
hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
if (!f->is_static)
- fdb_delete(f);
+ fdb_delete(br, f);
}
}
spin_unlock_bh(&br->hash_lock);
@@ -209,7 +222,7 @@ void br_fdb_delete_by_port(struct net_bridge *br,
}
}
- fdb_delete(f);
+ fdb_delete(br, f);
skip_delete: ;
}
}
@@ -234,7 +247,7 @@ struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
return NULL;
}
-#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+#if IS_ENABLED(CONFIG_ATM_LANE)
/* Interface used by ATM LANE hook to test
* if an addr is on some other bridge port */
int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
@@ -249,7 +262,7 @@ int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
ret = 0;
else {
fdb = __br_fdb_get(port->br, addr);
- ret = fdb && fdb->dst->dev != dev &&
+ ret = fdb && fdb->dst && fdb->dst->dev != dev &&
fdb->dst->state == BR_STATE_FORWARDING;
}
rcu_read_unlock();
@@ -281,6 +294,10 @@ int br_fdb_fillbuf(struct net_bridge *br, void *buf,
if (has_expired(br, f))
continue;
+ /* ignore pseudo entry for local MAC address */
+ if (!f->dst)
+ continue;
+
if (skip) {
--skip;
continue;
@@ -347,7 +364,6 @@ static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
fdb->is_static = 0;
fdb->updated = fdb->used = jiffies;
hlist_add_head_rcu(&fdb->hlist, head);
- fdb_notify(fdb, RTM_NEWNEIGH);
}
return fdb;
}
@@ -371,7 +387,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
br_warn(br, "adding interface %s with same address "
"as a received packet\n",
source->dev->name);
- fdb_delete(fdb);
+ fdb_delete(br, fdb);
}
fdb = fdb_create(head, source, addr);
@@ -379,6 +395,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
return -ENOMEM;
fdb->is_local = fdb->is_static = 1;
+ fdb_notify(br, fdb, RTM_NEWNEIGH);
return 0;
}
@@ -424,9 +441,11 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
}
} else {
spin_lock(&br->hash_lock);
- if (likely(!fdb_find(head, addr)))
- fdb_create(head, source, addr);
-
+ if (likely(!fdb_find(head, addr))) {
+ fdb = fdb_create(head, source, addr);
+ if (fdb)
+ fdb_notify(br, fdb, RTM_NEWNEIGH);
+ }
/* else we lose race and someone else inserts
* it first, don't bother updating
*/
@@ -446,7 +465,7 @@ static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
return NUD_REACHABLE;
}
-static int fdb_fill_info(struct sk_buff *skb,
+static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
const struct net_bridge_fdb_entry *fdb,
u32 pid, u32 seq, int type, unsigned int flags)
{
@@ -459,14 +478,13 @@ static int fdb_fill_info(struct sk_buff *skb,
if (nlh == NULL)
return -EMSGSIZE;
-
ndm = nlmsg_data(nlh);
ndm->ndm_family = AF_BRIDGE;
ndm->ndm_pad1 = 0;
ndm->ndm_pad2 = 0;
ndm->ndm_flags = 0;
ndm->ndm_type = 0;
- ndm->ndm_ifindex = fdb->dst->dev->ifindex;
+ ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
ndm->ndm_state = fdb_to_nud(fdb);
NLA_PUT(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr);
@@ -491,9 +509,10 @@ static inline size_t fdb_nlmsg_size(void)
+ nla_total_size(sizeof(struct nda_cacheinfo));
}
-static void fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
+static void fdb_notify(struct net_bridge *br,
+ const struct net_bridge_fdb_entry *fdb, int type)
{
- struct net *net = dev_net(fdb->dst->dev);
+ struct net *net = dev_net(br->dev);
struct sk_buff *skb;
int err = -ENOBUFS;
@@ -501,7 +520,7 @@ static void fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
if (skb == NULL)
goto errout;
- err = fdb_fill_info(skb, fdb, 0, 0, type, 0);
+ err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
@@ -538,7 +557,7 @@ int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
if (idx < cb->args[0])
goto skip;
- if (fdb_fill_info(skb, f,
+ if (fdb_fill_info(skb, br, f,
NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
RTM_NEWNEIGH,
@@ -556,7 +575,7 @@ skip:
return skb->len;
}
-/* Create new static fdb entry */
+/* Update (create or replace) forwarding database entry */
static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
__u16 state, __u16 flags)
{
@@ -572,19 +591,25 @@ static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
fdb = fdb_create(head, source, addr);
if (!fdb)
return -ENOMEM;
+ fdb_notify(br, fdb, RTM_NEWNEIGH);
} else {
if (flags & NLM_F_EXCL)
return -EEXIST;
+ }
+
+ if (fdb_to_nud(fdb) != state) {
+ if (state & NUD_PERMANENT)
+ fdb->is_local = fdb->is_static = 1;
+ else if (state & NUD_NOARP) {
+ fdb->is_local = 0;
+ fdb->is_static = 1;
+ } else
+ fdb->is_local = fdb->is_static = 0;
- if (flags & NLM_F_REPLACE)
- fdb->updated = fdb->used = jiffies;
- fdb->is_local = fdb->is_static = 0;
+ fdb->updated = fdb->used = jiffies;
+ fdb_notify(br, fdb, RTM_NEWNEIGH);
}
- if (state & NUD_PERMANENT)
- fdb->is_local = fdb->is_static = 1;
- else if (state & NUD_NOARP)
- fdb->is_static = 1;
return 0;
}
@@ -627,6 +652,11 @@ int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
return -EINVAL;
}
+ if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
+ pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
+ return -EINVAL;
+ }
+
p = br_port_get_rtnl(dev);
if (p == NULL) {
pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
@@ -634,9 +664,15 @@ int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
return -EINVAL;
}
- spin_lock_bh(&p->br->hash_lock);
- err = fdb_add_entry(p, addr, ndm->ndm_state, nlh->nlmsg_flags);
- spin_unlock_bh(&p->br->hash_lock);
+ if (ndm->ndm_flags & NTF_USE) {
+ rcu_read_lock();
+ br_fdb_update(p->br, p, addr);
+ rcu_read_unlock();
+ } else {
+ spin_lock_bh(&p->br->hash_lock);
+ err = fdb_add_entry(p, addr, ndm->ndm_state, nlh->nlmsg_flags);
+ spin_unlock_bh(&p->br->hash_lock);
+ }
return err;
}
@@ -651,7 +687,7 @@ static int fdb_delete_by_addr(struct net_bridge_port *p, const u8 *addr)
if (!fdb)
return -ENOENT;
- fdb_delete(fdb);
+ fdb_delete(p->br, fdb);
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.