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:
Родитель
d83b060360
Коммит
3ff661c38c
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@ -2011,6 +2011,33 @@ nla_put_failure:
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return -EMSGSIZE;
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}
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static inline size_t rtnl_fdb_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
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}
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static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
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{
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struct net *net = dev_net(dev);
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
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if (!skb)
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goto errout;
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err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
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if (err < 0) {
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
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return;
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errout:
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rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
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}
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static int rtnl_fdb_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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@ -2067,8 +2094,10 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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err = dev->netdev_ops->ndo_fdb_add(ndm, dev, addr,
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nlh->nlmsg_flags);
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if (!err)
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if (!err) {
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rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
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ndm->ndm_flags &= ~NTF_SELF;
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}
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}
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out:
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return err;
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@ -2125,8 +2154,10 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) {
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err = dev->netdev_ops->ndo_fdb_del(ndm, dev, addr);
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if (!err)
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if (!err) {
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rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
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ndm->ndm_flags &= ~NTF_SELF;
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}
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}
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out:
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return err;
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