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bridge: add support of adding and deleting mdb entries
This patch implents adding/deleting mdb entries via netlink. Currently all entries are temp, we probably need a flag to distinguish permanent entries too. Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang
David S. Miller
parent
37a393bc49
commit
cfd5675435
4 changed files with 297 additions and 29 deletions
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@ -157,6 +157,7 @@ enum {
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#define MDBA_ROUTER_MAX (__MDBA_ROUTER_MAX - 1)
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struct br_port_msg {
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__u8 family;
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__u32 ifindex;
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};
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@ -171,4 +172,11 @@ struct br_mdb_entry {
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} addr;
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};
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enum {
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MDBA_SET_ENTRY_UNSPEC,
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MDBA_SET_ENTRY,
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__MDBA_SET_ENTRY_MAX,
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};
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#define MDBA_SET_ENTRY_MAX (__MDBA_SET_ENTRY_MAX - 1)
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#endif /* _UAPI_LINUX_IF_BRIDGE_H */
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@ -4,6 +4,7 @@
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#include <linux/netdevice.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/if_ether.h>
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#include <net/ip.h>
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#include <net/netlink.h>
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#if IS_ENABLED(CONFIG_IPV6)
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@ -235,7 +236,246 @@ void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
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__br_mdb_notify(dev, &entry, type);
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}
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static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
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{
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if (entry->ifindex == 0)
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return false;
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if (entry->addr.proto == htons(ETH_P_IP)) {
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if (!ipv4_is_multicast(entry->addr.u.ip4))
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return false;
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if (ipv4_is_local_multicast(entry->addr.u.ip4))
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return false;
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#if IS_ENABLED(CONFIG_IPV6)
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} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
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if (!ipv6_is_transient_multicast(&entry->addr.u.ip6))
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return false;
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#endif
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} else
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return false;
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return true;
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}
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static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct net_device **pdev, struct br_mdb_entry **pentry)
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{
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struct net *net = sock_net(skb->sk);
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struct br_mdb_entry *entry;
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struct br_port_msg *bpm;
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struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
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struct net_device *dev;
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int err;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY, NULL);
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if (err < 0)
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return err;
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bpm = nlmsg_data(nlh);
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if (bpm->ifindex == 0) {
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pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
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return -EINVAL;
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}
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dev = __dev_get_by_index(net, bpm->ifindex);
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if (dev == NULL) {
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pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
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return -ENODEV;
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}
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if (!(dev->priv_flags & IFF_EBRIDGE)) {
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pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
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return -EOPNOTSUPP;
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}
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*pdev = dev;
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if (!tb[MDBA_SET_ENTRY] ||
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nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
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pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
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return -EINVAL;
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}
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entry = nla_data(tb[MDBA_SET_ENTRY]);
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if (!is_valid_mdb_entry(entry)) {
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pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
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return -EINVAL;
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}
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*pentry = entry;
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return 0;
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}
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static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
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struct br_ip *group)
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{
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struct net_bridge_mdb_entry *mp;
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struct net_bridge_port_group *p;
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struct net_bridge_port_group __rcu **pp;
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struct net_bridge_mdb_htable *mdb;
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int err;
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mdb = mlock_dereference(br->mdb, br);
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mp = br_mdb_ip_get(mdb, group);
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if (!mp) {
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mp = br_multicast_new_group(br, port, group);
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err = PTR_ERR(mp);
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if (IS_ERR(mp))
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return err;
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}
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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if (p->port == port)
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return -EEXIST;
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if ((unsigned long)p->port < (unsigned long)port)
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break;
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}
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p = br_multicast_new_port_group(port, group, *pp);
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if (unlikely(!p))
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return -ENOMEM;
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rcu_assign_pointer(*pp, p);
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br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
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return 0;
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}
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static int __br_mdb_add(struct net *net, struct net_bridge *br,
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struct br_mdb_entry *entry)
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{
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struct br_ip ip;
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struct net_device *dev;
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struct net_bridge_port *p;
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int ret;
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if (!netif_running(br->dev) || br->multicast_disabled)
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return -EINVAL;
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dev = __dev_get_by_index(net, entry->ifindex);
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if (!dev)
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return -ENODEV;
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p = br_port_get_rtnl(dev);
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if (!p || p->br != br || p->state == BR_STATE_DISABLED)
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return -EINVAL;
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ip.proto = entry->addr.proto;
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if (ip.proto == htons(ETH_P_IP))
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ip.u.ip4 = entry->addr.u.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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else
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ip.u.ip6 = entry->addr.u.ip6;
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#endif
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spin_lock_bh(&br->multicast_lock);
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ret = br_mdb_add_group(br, p, &ip);
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spin_unlock_bh(&br->multicast_lock);
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return ret;
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}
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static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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{
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struct net *net = sock_net(skb->sk);
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struct br_mdb_entry *entry;
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struct net_device *dev;
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struct net_bridge *br;
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int err;
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err = br_mdb_parse(skb, nlh, &dev, &entry);
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if (err < 0)
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return err;
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br = netdev_priv(dev);
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err = __br_mdb_add(net, br, entry);
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if (!err)
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__br_mdb_notify(dev, entry, RTM_NEWMDB);
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return err;
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}
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static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
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{
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struct net_bridge_mdb_htable *mdb;
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struct net_bridge_mdb_entry *mp;
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struct net_bridge_port_group *p;
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struct net_bridge_port_group __rcu **pp;
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struct br_ip ip;
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int err = -EINVAL;
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if (!netif_running(br->dev) || br->multicast_disabled)
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return -EINVAL;
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if (timer_pending(&br->multicast_querier_timer))
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return -EBUSY;
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ip.proto = entry->addr.proto;
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if (ip.proto == htons(ETH_P_IP))
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ip.u.ip4 = entry->addr.u.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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else
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ip.u.ip6 = entry->addr.u.ip6;
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#endif
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spin_lock_bh(&br->multicast_lock);
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mdb = mlock_dereference(br->mdb, br);
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mp = br_mdb_ip_get(mdb, &ip);
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if (!mp)
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goto unlock;
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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if (!p->port || p->port->dev->ifindex != entry->ifindex)
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continue;
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if (p->port->state == BR_STATE_DISABLED)
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goto unlock;
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rcu_assign_pointer(*pp, p->next);
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hlist_del_init(&p->mglist);
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del_timer(&p->timer);
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call_rcu_bh(&p->rcu, br_multicast_free_pg);
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err = 0;
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if (!mp->ports && !mp->mglist &&
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netif_running(br->dev))
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mod_timer(&mp->timer, jiffies);
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break;
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}
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unlock:
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spin_unlock_bh(&br->multicast_lock);
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return err;
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}
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static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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{
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struct net_device *dev;
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struct br_mdb_entry *entry;
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struct net_bridge *br;
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int err;
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err = br_mdb_parse(skb, nlh, &dev, &entry);
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if (err < 0)
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return err;
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br = netdev_priv(dev);
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err = __br_mdb_del(br, entry);
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if (!err)
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__br_mdb_notify(dev, entry, RTM_DELMDB);
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return err;
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}
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void br_mdb_init(void)
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{
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rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
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rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
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rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
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}
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@ -27,27 +27,14 @@
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/mld.h>
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#include <net/addrconf.h>
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#include <net/ip6_checksum.h>
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#endif
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#include "br_private.h"
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#define mlock_dereference(X, br) \
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rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
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static void br_multicast_start_querier(struct net_bridge *br);
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unsigned int br_mdb_rehash_seq;
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#if IS_ENABLED(CONFIG_IPV6)
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static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
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{
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if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
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return 1;
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return 0;
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}
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#endif
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static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
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{
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if (a->proto != b->proto)
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@ -104,8 +91,8 @@ static struct net_bridge_mdb_entry *__br_mdb_ip_get(
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return NULL;
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}
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static struct net_bridge_mdb_entry *br_mdb_ip_get(
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struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
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struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
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struct br_ip *dst)
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{
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if (!mdb)
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return NULL;
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@ -208,7 +195,7 @@ static int br_mdb_copy(struct net_bridge_mdb_htable *new,
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return maxlen > elasticity ? -EINVAL : 0;
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}
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static void br_multicast_free_pg(struct rcu_head *head)
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void br_multicast_free_pg(struct rcu_head *head)
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{
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struct net_bridge_port_group *p =
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container_of(head, struct net_bridge_port_group, rcu);
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@ -584,9 +571,8 @@ static struct net_bridge_mdb_entry *br_multicast_get_group(
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return mp;
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}
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static struct net_bridge_mdb_entry *br_multicast_new_group(
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struct net_bridge *br, struct net_bridge_port *port,
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struct br_ip *group)
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struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
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struct net_bridge_port *port, struct br_ip *group)
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{
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struct net_bridge_mdb_htable *mdb;
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struct net_bridge_mdb_entry *mp;
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@ -633,6 +619,26 @@ static struct net_bridge_mdb_entry *br_multicast_new_group(
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return mp;
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}
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struct net_bridge_port_group *br_multicast_new_port_group(
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struct net_bridge_port *port,
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struct br_ip *group,
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struct net_bridge_port_group *next)
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{
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struct net_bridge_port_group *p;
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p = kzalloc(sizeof(*p), GFP_ATOMIC);
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if (unlikely(!p))
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return NULL;
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p->addr = *group;
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p->port = port;
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p->next = next;
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hlist_add_head(&p->mglist, &port->mglist);
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setup_timer(&p->timer, br_multicast_port_group_expired,
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(unsigned long)p);
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return p;
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}
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static int br_multicast_add_group(struct net_bridge *br,
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struct net_bridge_port *port,
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struct br_ip *group)
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@ -668,18 +674,9 @@ static int br_multicast_add_group(struct net_bridge *br,
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break;
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}
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p = kzalloc(sizeof(*p), GFP_ATOMIC);
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err = -ENOMEM;
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p = br_multicast_new_port_group(port, group, *pp);
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if (unlikely(!p))
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goto err;
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p->addr = *group;
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p->port = port;
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p->next = *pp;
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hlist_add_head(&p->mglist, &port->mglist);
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setup_timer(&p->timer, br_multicast_port_group_expired,
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(unsigned long)p);
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rcu_assign_pointer(*pp, p);
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br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
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@ -434,10 +434,33 @@ extern int br_multicast_set_port_router(struct net_bridge_port *p,
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extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
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extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
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extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
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extern struct net_bridge_mdb_entry *br_mdb_ip_get(
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struct net_bridge_mdb_htable *mdb,
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struct br_ip *dst);
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extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
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struct net_bridge_port *port, struct br_ip *group);
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extern void br_multicast_free_pg(struct rcu_head *head);
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extern struct net_bridge_port_group *br_multicast_new_port_group(
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struct net_bridge_port *port,
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struct br_ip *group,
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struct net_bridge_port_group *next);
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extern void br_mdb_init(void);
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extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
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struct br_ip *group, int type);
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#define mlock_dereference(X, br) \
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rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/addrconf.h>
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static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
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{
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if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
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return 1;
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return 0;
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}
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#endif
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static inline bool br_multicast_is_router(struct net_bridge *br)
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{
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return br->multicast_router == 2 ||
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