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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>
This commit is contained in:
John Fastabend 2012-04-15 06:44:14 +00:00 committed by David S. Miller
parent d83b060360
commit 3ff661c38c
1 changed files with 33 additions and 2 deletions
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35
net/core/rtnetlink.c
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@ -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;