diff options
| author |   John Fastabend <john.r.fastabend@intel.com> | 2012-04-15 06:44:14 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-04-15 13:06:04 -0400 |
| commit | 3ff661c38c8492a2859e39e0ea1e3b6d30e89bf5 (patch) | |
| tree | b9bbd41a8fd1764cc49e8a2bb7c777328800eaa8 /net/core/rtnetlink.c | |
| parent | net: add fdb generic dump routine (diff) | |
| download | linux-dev-3ff661c38c8492a2859e39e0ea1e3b6d30e89bf5.tar.xz linux-dev-3ff661c38c8492a2859e39e0ea1e3b6d30e89bf5.zip | |
net: rtnetlink notify events for FDB NTF_SELF adds and deletes
It is useful to be able to monitor for FDB events in user space.
This patch adds support to generate netlink events when a change
is made to a device supporting the FDB ops.
This brings embedded switches inline with the SW net/bridge which
triggers events on FDB updates as well.
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index e8488c7b092c..b442d35bbc8b 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2011,6 +2011,33 @@ nla_put_failure: return -EMSGSIZE; } +static inline size_t rtnl_fdb_nlmsg_size(void) +{ + return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); +} + +static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) +{ + struct net *net = dev_net(dev); + struct sk_buff *skb; + int err = -ENOBUFS; + + skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); + if (!skb) + goto errout; + + err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); + if (err < 0) { + kfree_skb(skb); + goto errout; + } + + rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); + return; +errout: + rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); +} + static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); @@ -2067,8 +2094,10 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) err = dev->netdev_ops->ndo_fdb_add(ndm, dev, addr, nlh->nlmsg_flags); - if (!err) + if (!err) { + rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); ndm->ndm_flags &= ~NTF_SELF; + } } out: return err; @@ -2125,8 +2154,10 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) { err = dev->netdev_ops->ndo_fdb_del(ndm, dev, addr); - if (!err) + if (!err) { + rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); ndm->ndm_flags &= ~NTF_SELF; + } } out: return err; |