From 83f7398ea549df793022ac6e7505040a306a2f7e Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Tue, 22 Sep 2020 10:30:14 +0300 Subject: [PATCH] net: bridge: mdb: use extack in br_mdb_add() and br_mdb_add_group() Pass and use extack all the way down to br_mdb_add_group(). Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/bridge/br_mdb.c | 54 +++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 42 insertions(+), 12 deletions(-) diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index 92ab736..1df62d8 100644 --- a/net/bridge/br_mdb.c +++ b/net/bridge/br_mdb.c @@ -723,7 +723,8 @@ static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, } static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, - struct br_ip *group, struct br_mdb_entry *entry) + struct br_ip *group, struct br_mdb_entry *entry, + struct netlink_ext_ack *extack) { struct net_bridge_mdb_entry *mp; struct net_bridge_port_group *p; @@ -742,10 +743,14 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, /* host join */ if (!port) { /* don't allow any flags for host-joined groups */ - if (entry->state) + if (entry->state) { + NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups"); return -EINVAL; - if (mp->host_joined) + } + if (mp->host_joined) { + NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host"); return -EEXIST; + } br_multicast_host_join(mp, false); br_mdb_notify(br->dev, mp, NULL, RTM_NEWMDB); @@ -756,16 +761,20 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; pp = &p->next) { - if (p->port == port) + if (p->port == port) { + NL_SET_ERR_MSG_MOD(extack, "Group is already joined by port"); return -EEXIST; + } if ((unsigned long)p->port < (unsigned long)port) break; } p = br_multicast_new_port_group(port, group, *pp, entry->state, NULL, MCAST_EXCLUDE); - if (unlikely(!p)) + if (unlikely(!p)) { + NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group"); return -ENOMEM; + } rcu_assign_pointer(*pp, p); if (entry->state == MDB_TEMPORARY) mod_timer(&p->timer, now + br->multicast_membership_interval); @@ -776,7 +785,8 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, static int __br_mdb_add(struct net *net, struct net_bridge *br, struct net_bridge_port *p, - struct br_mdb_entry *entry) + struct br_mdb_entry *entry, + struct netlink_ext_ack *extack) { struct br_ip ip; int ret; @@ -784,7 +794,7 @@ static int __br_mdb_add(struct net *net, struct net_bridge *br, __mdb_entry_to_br_ip(entry, &ip); spin_lock_bh(&br->multicast_lock); - ret = br_mdb_add_group(br, p, &ip, entry); + ret = br_mdb_add_group(br, p, &ip, entry, extack); spin_unlock_bh(&br->multicast_lock); return ret; @@ -808,17 +818,37 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, br = netdev_priv(dev); - if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) + if (!netif_running(br->dev)) { + NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running"); return -EINVAL; + } + + if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { + NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled"); + return -EINVAL; + } if (entry->ifindex != br->dev->ifindex) { pdev = __dev_get_by_index(net, entry->ifindex); - if (!pdev) + if (!pdev) { + NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist"); return -ENODEV; + } p = br_port_get_rtnl(pdev); - if (!p || p->br != br || p->state == BR_STATE_DISABLED) + if (!p) { + NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port"); return -EINVAL; + } + + if (p->br != br) { + NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device"); + return -EINVAL; + } + if (p->state == BR_STATE_DISABLED) { + NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state"); + return -EINVAL; + } vg = nbp_vlan_group(p); } else { vg = br_vlan_group(br); @@ -830,12 +860,12 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { list_for_each_entry(v, &vg->vlan_list, vlist) { entry->vid = v->vid; - err = __br_mdb_add(net, br, p, entry); + err = __br_mdb_add(net, br, p, entry, extack); if (err) break; } } else { - err = __br_mdb_add(net, br, p, entry); + err = __br_mdb_add(net, br, p, entry, extack); } return err; -- 2.7.4