Register a generic PF_BRIDGE rtnl_fdb_flush call which does basic
validation and dispatches the call to the appropriate device based on
ndm flags (NTF_MASTER and NTF_SELF). The flags are interepreted in a
similar way to the already existing fdb add and del.
Signed-off-by: Nikolay Aleksandrov <razor@xxxxxxxxxxxxx>
---
include/uapi/linux/neighbour.h | 6 ++++
net/core/rtnetlink.c | 52 ++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/include/uapi/linux/neighbour.h b/include/uapi/linux/neighbour.h
index db05fb55055e..60e728319a50 100644
--- a/include/uapi/linux/neighbour.h
+++ b/include/uapi/linux/neighbour.h
@@ -212,4 +212,10 @@ enum {
};
#define NFEA_MAX (__NFEA_MAX - 1)
+enum {
+ NDFA_UNSPEC,
+ __NDFA_MAX
+};
+#define NDFA_MAX (__NDFA_MAX - 1)
+
#endif
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4041b3e2e8ec..7325b60d1aa2 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4659,6 +4659,56 @@ static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
return err;
}
+static const struct nla_policy fdb_flush_policy[NDFA_MAX + 1] = {
+ [NDFA_UNSPEC] = { .type = NLA_REJECT },
+};
+
+static int rtnl_fdb_flush(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tb[NDFA_MAX + 1];
+ struct net_device *dev;
+ struct ndmsg *ndm;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDFA_MAX, fdb_flush_policy,
+ extack);
+ if (err < 0)
+ return err;
+
+ ndm = nlmsg_data(nlh);
+ if (ndm->ndm_ifindex == 0) {
+ NL_SET_ERR_MSG(extack, "Invalid ifindex");
+ return -EINVAL;
+ }
+
+ dev = __dev_get_by_index(net, ndm->ndm_ifindex);
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Unknown ifindex");
+ return -ENODEV;
+ }
+
+ err = -EOPNOTSUPP;
+ if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
+ netif_is_bridge_port(dev)) {
+ struct net_device *br_dev = netdev_master_upper_dev_get(dev);
+
+ err = br_dev->netdev_ops->ndo_fdb_flush(ndm, tb, dev, 0, extack);
+ if (err)
+ goto out;
+ else
+ ndm->ndm_flags &= ~NTF_MASTER;
+ }
+ if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_flush) {
+ err = dev->netdev_ops->ndo_fdb_flush(ndm, tb, dev, 0, extack);
+ if (!err)
+ ndm->ndm_flags &= ~NTF_SELF;
+ }
+out:
+ return err;
+}
+
static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
unsigned int attrnum, unsigned int flag)
{
@@ -6144,6 +6194,8 @@ void __init rtnetlink_init(void)
rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
+ rtnl_register(PF_BRIDGE, RTM_FLUSHNEIGH, rtnl_fdb_flush, NULL, 0);
+
rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
0);
rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
--
2.35.1
