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Commit d83b0603 authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
Browse files

net: add fdb generic dump routine 



This adds a generic dump routine drivers can call. It
should be sufficient to handle any bridging model that
uses the unicast address list. This should be most SR-IOV
enabled NICs.

v2: return error on nlmsg_put and use -EMSGSIZE instead
    of -ENOMEM this is inline other usages

Signed-off-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 12a94634

net/core/rtnetlink.c

+84 −0
Original line number Diff line number Diff line
@@ -1980,6 +1980,37 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 
		rtnl_set_sk_err(net, RTNLGRP_LINK, err);

}



static int nlmsg_populate_fdb_fill(struct sk_buff *skb,

				   struct net_device *dev,

				   u8 *addr, u32 pid, u32 seq,

				   int type, unsigned int flags)

{

	struct nlmsghdr *nlh;

	struct ndmsg *ndm;



	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);

	if (!nlh)

		return -EMSGSIZE;



	ndm = nlmsg_data(nlh);

	ndm->ndm_family  = AF_BRIDGE;

	ndm->ndm_pad1	 = 0;

	ndm->ndm_pad2    = 0;

	ndm->ndm_flags	 = flags;

	ndm->ndm_type	 = 0;

	ndm->ndm_ifindex = dev->ifindex;

	ndm->ndm_state   = NUD_PERMANENT;



	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))

		goto nla_put_failure;



	return nlmsg_end(skb, nlh);



nla_put_failure:

	nlmsg_cancel(skb, nlh);

	return -EMSGSIZE;

}



static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)

{

	struct net *net = sock_net(skb->sk);
@@ -2101,6 +2132,59 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 
	return err;

}



static int nlmsg_populate_fdb(struct sk_buff *skb,

			      struct netlink_callback *cb,

			      struct net_device *dev,

			      int *idx,

			      struct netdev_hw_addr_list *list)

{

	struct netdev_hw_addr *ha;

	int err;

	u32 pid, seq;



	pid = NETLINK_CB(cb->skb).pid;

	seq = cb->nlh->nlmsg_seq;



	list_for_each_entry(ha, &list->list, list) {

		if (*idx < cb->args[0])

			goto skip;



		err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,

					      pid, seq, 0, NTF_SELF);

		if (err < 0)

			return err;

skip:

		*idx += 1;

	}

	return 0;

}



/**

 * ndo_dflt_fdb_dump: default netdevice operation to dump an FDB table.

 * @nlh: netlink message header

 * @dev: netdevice

 *

 * Default netdevice operation to dump the existing unicast address list.

 * Returns zero on success.

 */

int ndo_dflt_fdb_dump(struct sk_buff *skb,

		      struct netlink_callback *cb,

		      struct net_device *dev,

		      int idx)

{

	int err;



	netif_addr_lock_bh(dev);

	err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);

	if (err)

		goto out;

	nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);

out:

	netif_addr_unlock_bh(dev);

	return idx;

}

EXPORT_SYMBOL(ndo_dflt_fdb_dump);



static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)

{

	int idx = 0;