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 <[email protected]> --- 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
