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bridge: add NTF_USE support

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More changes to the recent code to support control of forwarding
database via netlink.
   * Support NTF_USE like neighbour table
   * Validate state bits from application
   * Only send notifications (and change bits) if new entry is
     different.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2011-11-09 18:30:08 +00:00 committed by David S. Miller
parent 23020ab353
commit 292d139898
1 changed files with 28 additions and 12 deletions
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40
net/bridge/br_fdb.c
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@ -556,7 +556,7 @@ 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)
{
@ -575,16 +575,21 @@ static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
} else {
if (flags & NLM_F_EXCL)
return -EEXIST;
if (flags & NLM_F_REPLACE)
fdb->updated = fdb->used = jiffies;
fdb->is_local = fdb->is_static = 0;
}
if (state & NUD_PERMANENT)
fdb->is_local = fdb->is_static = 1;
else if (state & NUD_NOARP)
fdb->is_static = 1;
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;
fdb->updated = fdb->used = jiffies;
fdb_notify(fdb, RTM_NEWNEIGH);
}
return 0;
}
@ -627,6 +632,11 @@ 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 +644,15 @@ 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;
}