diff options
author | Cong Wang <amwang@redhat.com> | 2012-12-11 22:23:07 +0000 |
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committer | David S. Miller <davem@davemloft.net> | 2012-12-12 13:02:30 -0500 |
commit | 37a393bc4932d7bac360f40064aaafc01ab44901 (patch) | |
tree | 61a0a7cd1ab9db418558dbc44d4455868b7220cb /net/bridge/br_mdb.c | |
parent | fd0ea7dbfae16015e72c4bbc6b1b43fffc3b914f (diff) | |
download | linux-3.10-37a393bc4932d7bac360f40064aaafc01ab44901.tar.gz linux-3.10-37a393bc4932d7bac360f40064aaafc01ab44901.tar.bz2 linux-3.10-37a393bc4932d7bac360f40064aaafc01ab44901.zip |
bridge: notify mdb changes via netlink
As Stephen mentioned, we need to monitor the mdb
changes in user-space, so add notifications via netlink 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>
Diffstat (limited to 'net/bridge/br_mdb.c')
-rw-r--r-- | net/bridge/br_mdb.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index ccc43a9bff8..a8cfbf5f3c6 100644 --- a/net/bridge/br_mdb.c +++ b/net/bridge/br_mdb.c @@ -155,6 +155,86 @@ out: return skb->len; } +static int nlmsg_populate_mdb_fill(struct sk_buff *skb, + struct net_device *dev, + struct br_mdb_entry *entry, u32 pid, + u32 seq, int type, unsigned int flags) +{ + struct nlmsghdr *nlh; + struct br_port_msg *bpm; + struct nlattr *nest, *nest2; + + nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI); + if (!nlh) + return -EMSGSIZE; + + bpm = nlmsg_data(nlh); + bpm->family = AF_BRIDGE; + bpm->ifindex = dev->ifindex; + nest = nla_nest_start(skb, MDBA_MDB); + if (nest == NULL) + goto cancel; + nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); + if (nest2 == NULL) + goto end; + + if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry)) + goto end; + + nla_nest_end(skb, nest2); + nla_nest_end(skb, nest); + return nlmsg_end(skb, nlh); + +end: + nla_nest_end(skb, nest); +cancel: + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; +} + +static inline size_t rtnl_mdb_nlmsg_size(void) +{ + return NLMSG_ALIGN(sizeof(struct br_port_msg)) + + nla_total_size(sizeof(struct br_mdb_entry)); +} + +static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry, + int type) +{ + struct net *net = dev_net(dev); + struct sk_buff *skb; + int err = -ENOBUFS; + + skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC); + if (!skb) + goto errout; + + err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF); + if (err < 0) { + kfree_skb(skb); + goto errout; + } + + rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); + return; +errout: + rtnl_set_sk_err(net, RTNLGRP_MDB, err); +} + +void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, + struct br_ip *group, int type) +{ + struct br_mdb_entry entry; + + entry.ifindex = port->dev->ifindex; + entry.addr.proto = group->proto; + entry.addr.u.ip4 = group->u.ip4; +#if IS_ENABLED(CONFIG_IPV6) + entry.addr.u.ip6 = group->u.ip6; +#endif + __br_mdb_notify(dev, &entry, type); +} + void br_mdb_init(void) { rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL); |