net/bridge/br_netlink.c - kernel/msm-5.4 - Gitiles

 /*
  *	Bridge netlink control interface
  *
  *	Authors:
  *	Stephen Hemminger		<shemminger@osdl.org>
  *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License
  *	as published by the Free Software Foundation; either version
  *	2 of the License, or (at your option) any later version.
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/etherdevice.h>
 #include <net/rtnetlink.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
 #include <net/switchdev.h>
 #include <uapi/linux/if_bridge.h>

 #include "br_private.h"
 #include "br_private_stp.h"

 static inline size_t br_port_info_size(void)
 {
 	return nla_total_size(1)	/* IFLA_BRPORT_STATE  */
 		+ nla_total_size(2)	/* IFLA_BRPORT_PRIORITY */
 		+ nla_total_size(4)	/* IFLA_BRPORT_COST */
 		+ nla_total_size(1)	/* IFLA_BRPORT_MODE */
 		+ nla_total_size(1)	/* IFLA_BRPORT_GUARD */
 		+ nla_total_size(1)	/* IFLA_BRPORT_PROTECT */
 		+ nla_total_size(1)	/* IFLA_BRPORT_FAST_LEAVE */
 		+ nla_total_size(1)	/* IFLA_BRPORT_LEARNING */
 		+ nla_total_size(1)	/* IFLA_BRPORT_UNICAST_FLOOD */
 		+ 0;
 }

 static inline size_t br_nlmsg_size(void)
 {
 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 		+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 		+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 		+ nla_total_size(4) /* IFLA_MASTER */
 		+ nla_total_size(4) /* IFLA_MTU */
 		+ nla_total_size(4) /* IFLA_LINK */
 		+ nla_total_size(1) /* IFLA_OPERSTATE */
 		+ nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
 }

 static int br_port_fill_attrs(struct sk_buff *skb,
 			      const struct net_bridge_port *p)
 {
 	u8 mode = !!(p->flags & BR_HAIRPIN_MODE);

 	if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
 	    nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
 	    nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
 	    nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
 	    nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)))
 		return -EMSGSIZE;

 	return 0;
 }

 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
 				    u16 vid_end, u16 flags)
 {
 	struct  bridge_vlan_info vinfo;

 	if ((vid_end - vid_start) > 0) {
 		/* add range to skb */
 		vinfo.vid = vid_start;
 		vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
 		if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 			    sizeof(vinfo), &vinfo))
 			goto nla_put_failure;

 		vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;

 		vinfo.vid = vid_end;
 		vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
 		if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 			    sizeof(vinfo), &vinfo))
 			goto nla_put_failure;
 	} else {
 		vinfo.vid = vid_start;
 		vinfo.flags = flags;
 		if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 			    sizeof(vinfo), &vinfo))
 			goto nla_put_failure;
 	}

 	return 0;

 nla_put_failure:
 	return -EMSGSIZE;
 }

 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
 					 const struct net_port_vlans *pv)
 {
 	u16 vid_range_start = 0, vid_range_end = 0;
 	u16 vid_range_flags = 0;
 	u16 pvid, vid, flags;
 	int err = 0;

 	/* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
 	 * and mark vlan info with begin and end flags
 	 * if vlaninfo represents a range
 	 */
 	pvid = br_get_pvid(pv);
 	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 		flags = 0;
 		if (vid == pvid)
 			flags |= BRIDGE_VLAN_INFO_PVID;

 		if (test_bit(vid, pv->untagged_bitmap))
 			flags |= BRIDGE_VLAN_INFO_UNTAGGED;

 		if (vid_range_start == 0) {
 			goto initvars;
 		} else if ((vid - vid_range_end) == 1 &&
 			flags == vid_range_flags) {
 			vid_range_end = vid;
 			continue;
 		} else {
 			err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 						       vid_range_end,
 						       vid_range_flags);
 			if (err)
 				return err;
 		}

 initvars:
 		vid_range_start = vid;
 		vid_range_end = vid;
 		vid_range_flags = flags;
 	}

 	if (vid_range_start != 0) {
 		/* Call it once more to send any left over vlans */
 		err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 					       vid_range_end,
 					       vid_range_flags);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 static int br_fill_ifvlaninfo(struct sk_buff *skb,
 			      const struct net_port_vlans *pv)
 {
 	struct bridge_vlan_info vinfo;
 	u16 pvid, vid;

 	pvid = br_get_pvid(pv);
 	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 		vinfo.vid = vid;
 		vinfo.flags = 0;
 		if (vid == pvid)
 			vinfo.flags |= BRIDGE_VLAN_INFO_PVID;

 		if (test_bit(vid, pv->untagged_bitmap))
 			vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;

 		if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 			    sizeof(vinfo), &vinfo))
 			goto nla_put_failure;
 	}

 	return 0;

 nla_put_failure:
 	return -EMSGSIZE;
 }

 /*
  * Create one netlink message for one interface
  * Contains port and master info as well as carrier and bridge state.
  */
 static int br_fill_ifinfo(struct sk_buff *skb,
 			  const struct net_bridge_port *port,
 			  u32 pid, u32 seq, int event, unsigned int flags,
 			  u32 filter_mask, const struct net_device *dev)
 {
 	const struct net_bridge *br;
 	struct ifinfomsg *hdr;
 	struct nlmsghdr *nlh;
 	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;

 	if (port)
 		br = port->br;
 	else
 		br = netdev_priv(dev);

 	br_debug(br, "br_fill_info event %d port %s master %s\n",
 		     event, dev->name, br->dev->name);

 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
 	if (nlh == NULL)
 		return -EMSGSIZE;

 	hdr = nlmsg_data(nlh);
 	hdr->ifi_family = AF_BRIDGE;
 	hdr->__ifi_pad = 0;
 	hdr->ifi_type = dev->type;
 	hdr->ifi_index = dev->ifindex;
 	hdr->ifi_flags = dev_get_flags(dev);
 	hdr->ifi_change = 0;

 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 	    nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 	    nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
 	    (dev->addr_len &&
 	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
 	    (dev->ifindex != dev->iflink &&
 	     nla_put_u32(skb, IFLA_LINK, dev->iflink)))
 		goto nla_put_failure;

 	if (event == RTM_NEWLINK && port) {
 		struct nlattr *nest
 			= nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);

 		if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
 			goto nla_put_failure;
 		nla_nest_end(skb, nest);
 	}

 	/* Check if  the VID information is requested */
 	if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 	    (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 		const struct net_port_vlans *pv;
 		struct nlattr *af;
 		int err;

 		if (port)
 			pv = nbp_get_vlan_info(port);
 		else
 			pv = br_get_vlan_info(br);

 		if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
 			goto done;

 		af = nla_nest_start(skb, IFLA_AF_SPEC);
 		if (!af)
 			goto nla_put_failure;

 		if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 			err = br_fill_ifvlaninfo_compressed(skb, pv);
 		else
 			err = br_fill_ifvlaninfo(skb, pv);
 		if (err)
 			goto nla_put_failure;
 		nla_nest_end(skb, af);
 	}

 done:
 	nlmsg_end(skb, nlh);
 	return 0;

 nla_put_failure:
 	nlmsg_cancel(skb, nlh);
 	return -EMSGSIZE;
 }

 /*
  * Notify listeners of a change in port information
  */
 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 {
 	struct net *net;
 	struct sk_buff *skb;
 	int err = -ENOBUFS;

 	if (!port)
 		return;

 	net = dev_net(port->dev);
 	br_debug(port->br, "port %u(%s) event %d\n",
 		 (unsigned int)port->port_no, port->dev->name, event);

 	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
 	if (skb == NULL)
 		goto errout;

 	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in br_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(skb);
 		goto errout;
 	}
 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 	return;
 errout:
 	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 }


 /*
  * Dump information about all ports, in response to GETLINK
  */
 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 	       struct net_device *dev, u32 filter_mask)
 {
 	struct net_bridge_port *port = br_port_get_rtnl(dev);

 	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
 	    !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
 		return 0;

 	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
 			      filter_mask, dev);
 }

 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
 			int cmd, struct bridge_vlan_info *vinfo)
 {
 	int err = 0;

 	switch (cmd) {
 	case RTM_SETLINK:
 		if (p) {
 			err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
 			if (err)
 				break;

 			if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 				err = br_vlan_add(p->br, vinfo->vid,
 						  vinfo->flags);
 		} else {
 			err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 		}
 		break;

 	case RTM_DELLINK:
 		if (p) {
 			nbp_vlan_delete(p, vinfo->vid);
 			if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 				br_vlan_delete(p->br, vinfo->vid);
 		} else {
 			br_vlan_delete(br, vinfo->vid);
 		}
 		break;
 	}

 	return err;
 }

 static int br_afspec(struct net_bridge *br,
 		     struct net_bridge_port *p,
 		     struct nlattr *af_spec,
 		     int cmd)
 {
 	struct bridge_vlan_info *vinfo_start = NULL;
 	struct bridge_vlan_info *vinfo = NULL;
 	struct nlattr *attr;
 	int err = 0;
 	int rem;

 	nla_for_each_nested(attr, af_spec, rem) {
 		if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 			continue;
 		if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 			return -EINVAL;
 		vinfo = nla_data(attr);
 		if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 			if (vinfo_start)
 				return -EINVAL;
 			vinfo_start = vinfo;
 			continue;
 		}

 		if (vinfo_start) {
 			struct bridge_vlan_info tmp_vinfo;
 			int v;

 			if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
 				return -EINVAL;

 			if (vinfo->vid <= vinfo_start->vid)
 				return -EINVAL;

 			memcpy(&tmp_vinfo, vinfo_start,
 			       sizeof(struct bridge_vlan_info));

 			for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
 				tmp_vinfo.vid = v;
 				err = br_vlan_info(br, p, cmd, &tmp_vinfo);
 				if (err)
 					break;
 			}
 			vinfo_start = NULL;
 		} else {
 			err = br_vlan_info(br, p, cmd, vinfo);
 		}
 		if (err)
 			break;
 	}

 	return err;
 }

 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
 	[IFLA_BRPORT_STATE]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_COST]	= { .type = NLA_U32 },
 	[IFLA_BRPORT_PRIORITY]	= { .type = NLA_U16 },
 	[IFLA_BRPORT_MODE]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_GUARD]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_PROTECT]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
 	[IFLA_BRPORT_LEARNING]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 };

 /* Change the state of the port and notify spanning tree */
 static int br_set_port_state(struct net_bridge_port *p, u8 state)
 {
 	if (state > BR_STATE_BLOCKING)
 		return -EINVAL;

 	/* if kernel STP is running, don't allow changes */
 	if (p->br->stp_enabled == BR_KERNEL_STP)
 		return -EBUSY;

 	/* if device is not up, change is not allowed
 	 * if link is not present, only allowable state is disabled
 	 */
 	if (!netif_running(p->dev) ||
 	    (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
 		return -ENETDOWN;

 	br_set_state(p, state);
 	br_log_state(p);
 	br_port_state_selection(p->br);
 	return 0;
 }

 /* Set/clear or port flags based on attribute */
 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 			   int attrtype, unsigned long mask)
 {
 	if (tb[attrtype]) {
 		u8 flag = nla_get_u8(tb[attrtype]);
 		if (flag)
 			p->flags |= mask;
 		else
 			p->flags &= ~mask;
 	}
 }

 /* Process bridge protocol info on port */
 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 {
 	int err;
 	unsigned long old_flags = p->flags;

 	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
 	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
 	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 	br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
 	br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
 	br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
 	br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);

 	if (tb[IFLA_BRPORT_COST]) {
 		err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
 		if (err)
 			return err;
 	}

 	if (tb[IFLA_BRPORT_PRIORITY]) {
 		err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
 		if (err)
 			return err;
 	}

 	if (tb[IFLA_BRPORT_STATE]) {
 		err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
 		if (err)
 			return err;
 	}

 	br_port_flags_change(p, old_flags ^ p->flags);
 	return 0;
 }

 /* Change state and parameters on port. */
 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 {
 	struct nlattr *protinfo;
 	struct nlattr *afspec;
 	struct net_bridge_port *p;
 	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
 	int err = 0, ret_offload = 0;

 	protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
 	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 	if (!protinfo && !afspec)
 		return 0;

 	p = br_port_get_rtnl(dev);
 	/* We want to accept dev as bridge itself if the AF_SPEC
 	 * is set to see if someone is setting vlan info on the bridge
 	 */
 	if (!p && !afspec)
 		return -EINVAL;

 	if (p && protinfo) {
 		if (protinfo->nla_type & NLA_F_NESTED) {
 			err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
 					       protinfo, br_port_policy);
 			if (err)
 				return err;

 			spin_lock_bh(&p->br->lock);
 			err = br_setport(p, tb);
 			spin_unlock_bh(&p->br->lock);
 		} else {
 			/* Binary compatibility with old RSTP */
 			if (nla_len(protinfo) < sizeof(u8))
 				return -EINVAL;

 			spin_lock_bh(&p->br->lock);
 			err = br_set_port_state(p, nla_get_u8(protinfo));
 			spin_unlock_bh(&p->br->lock);
 		}
 		if (err)
 			goto out;
 	}

 	if (afspec) {
 		err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 				afspec, RTM_SETLINK);
 	}

 	if (p && !(flags & BRIDGE_FLAGS_SELF)) {
 		/* set bridge attributes in hardware if supported
 		 */
 		ret_offload = netdev_switch_port_bridge_setlink(dev, nlh,
 								flags);
 		if (ret_offload && ret_offload != -EOPNOTSUPP)
 			br_warn(p->br, "error setting attrs on port %u(%s)\n",
 				(unsigned int)p->port_no, p->dev->name);
 	}

 	if (err == 0)
 		br_ifinfo_notify(RTM_NEWLINK, p);
 out:
 	return err;
 }

 /* Delete port information */
 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 {
 	struct nlattr *afspec;
 	struct net_bridge_port *p;
 	int err = 0, ret_offload = 0;

 	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 	if (!afspec)
 		return 0;

 	p = br_port_get_rtnl(dev);
 	/* We want to accept dev as bridge itself as well */
 	if (!p && !(dev->priv_flags & IFF_EBRIDGE))
 		return -EINVAL;

 	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 			afspec, RTM_DELLINK);
 	if (err == 0)
 		/* Send RTM_NEWLINK because userspace
 		 * expects RTM_NEWLINK for vlan dels
 		 */
 		br_ifinfo_notify(RTM_NEWLINK, p);

 	if (p && !(flags & BRIDGE_FLAGS_SELF)) {
 		/* del bridge attributes in hardware
 		 */
 		ret_offload = netdev_switch_port_bridge_dellink(dev, nlh,
 								flags);
 		if (ret_offload && ret_offload != -EOPNOTSUPP)
 			br_warn(p->br, "error deleting attrs on port %u (%s)\n",
 				(unsigned int)p->port_no, p->dev->name);
 	}

 	return err;
 }
 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
 {
 	if (tb[IFLA_ADDRESS]) {
 		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 			return -EINVAL;
 		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 			return -EADDRNOTAVAIL;
 	}

 	return 0;
 }

 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
 			  struct nlattr *tb[], struct nlattr *data[])
 {
 	struct net_bridge *br = netdev_priv(dev);

 	if (tb[IFLA_ADDRESS]) {
 		spin_lock_bh(&br->lock);
 		br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
 		spin_unlock_bh(&br->lock);
 	}

 	return register_netdevice(dev);
 }

 static int br_port_slave_changelink(struct net_device *brdev,
 				    struct net_device *dev,
 				    struct nlattr *tb[],
 				    struct nlattr *data[])
 {
 	if (!data)
 		return 0;
 	return br_setport(br_port_get_rtnl(dev), data);
 }

 static int br_port_fill_slave_info(struct sk_buff *skb,
 				   const struct net_device *brdev,
 				   const struct net_device *dev)
 {
 	return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
 }

 static size_t br_port_get_slave_size(const struct net_device *brdev,
 				     const struct net_device *dev)
 {
 	return br_port_info_size();
 }

 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
 	[IFLA_BR_FORWARD_DELAY]	= { .type = NLA_U32 },
 	[IFLA_BR_HELLO_TIME]	= { .type = NLA_U32 },
 	[IFLA_BR_MAX_AGE]	= { .type = NLA_U32 },
 };

 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 			 struct nlattr *data[])
 {
 	struct net_bridge *br = netdev_priv(brdev);
 	int err;

 	if (!data)
 		return 0;

 	if (data[IFLA_BR_FORWARD_DELAY]) {
 		err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
 		if (err)
 			return err;
 	}

 	if (data[IFLA_BR_HELLO_TIME]) {
 		err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
 		if (err)
 			return err;
 	}

 	if (data[IFLA_BR_MAX_AGE]) {
 		err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
 		if (err)
 			return err;
 	}

 	return 0;
 }

 static size_t br_get_size(const struct net_device *brdev)
 {
 	return nla_total_size(sizeof(u32)) +	/* IFLA_BR_FORWARD_DELAY  */
 	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_HELLO_TIME */
 	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_MAX_AGE */
 	       0;
 }

 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 {
 	struct net_bridge *br = netdev_priv(brdev);
 	u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
 	u32 hello_time = jiffies_to_clock_t(br->hello_time);
 	u32 age_time = jiffies_to_clock_t(br->max_age);

 	if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
 	    nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
 	    nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
 		return -EMSGSIZE;

 	return 0;
 }

 static size_t br_get_link_af_size(const struct net_device *dev)
 {
 	struct net_port_vlans *pv;

 	if (br_port_exists(dev))
 		pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
 	else if (dev->priv_flags & IFF_EBRIDGE)
 		pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
 	else
 		return 0;

 	if (!pv)
 		return 0;

 	/* Each VLAN is returned in bridge_vlan_info along with flags */
 	return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
 }

 static struct rtnl_af_ops br_af_ops __read_mostly = {
 	.family			= AF_BRIDGE,
 	.get_link_af_size	= br_get_link_af_size,
 };

 struct rtnl_link_ops br_link_ops __read_mostly = {
 	.kind			= "bridge",
 	.priv_size		= sizeof(struct net_bridge),
 	.setup			= br_dev_setup,
 	.maxtype		= IFLA_BRPORT_MAX,
 	.policy			= br_policy,
 	.validate		= br_validate,
 	.newlink		= br_dev_newlink,
 	.changelink		= br_changelink,
 	.dellink		= br_dev_delete,
 	.get_size		= br_get_size,
 	.fill_info		= br_fill_info,

 	.slave_maxtype		= IFLA_BRPORT_MAX,
 	.slave_policy		= br_port_policy,
 	.slave_changelink	= br_port_slave_changelink,
 	.get_slave_size		= br_port_get_slave_size,
 	.fill_slave_info	= br_port_fill_slave_info,
 };

 int __init br_netlink_init(void)
 {
 	int err;

 	br_mdb_init();
 	rtnl_af_register(&br_af_ops);

 	err = rtnl_link_register(&br_link_ops);
 	if (err)
 		goto out_af;

 	return 0;

 out_af:
 	rtnl_af_unregister(&br_af_ops);
 	br_mdb_uninit();
 	return err;
 }

 void br_netlink_fini(void)
 {
 	br_mdb_uninit();
 	rtnl_af_unregister(&br_af_ops);
 	rtnl_link_unregister(&br_link_ops);
 }
	/*
	* Bridge netlink control interface
	*
	* Authors:
	* Stephen Hemminger <shemminger@osdl.org>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/etherdevice.h>
	#include <net/rtnetlink.h>
	#include <net/net_namespace.h>
	#include <net/sock.h>
	#include <net/switchdev.h>
	#include <uapi/linux/if_bridge.h>

	#include "br_private.h"
	#include "br_private_stp.h"

	static inline size_t br_port_info_size(void)
	{
	return nla_total_size(1) /* IFLA_BRPORT_STATE */
	+ nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
	+ nla_total_size(4) /* IFLA_BRPORT_COST */
	+ nla_total_size(1) /* IFLA_BRPORT_MODE */
	+ nla_total_size(1) /* IFLA_BRPORT_GUARD */
	+ nla_total_size(1) /* IFLA_BRPORT_PROTECT */
	+ nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
	+ nla_total_size(1) /* IFLA_BRPORT_LEARNING */
	+ nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
	+ 0;
	}

	static inline size_t br_nlmsg_size(void)
	{
	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
	+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
	+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
	+ nla_total_size(4) /* IFLA_MASTER */
	+ nla_total_size(4) /* IFLA_MTU */
	+ nla_total_size(4) /* IFLA_LINK */
	+ nla_total_size(1) /* IFLA_OPERSTATE */
	+ nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
	}

	static int br_port_fill_attrs(struct sk_buff *skb,
	const struct net_bridge_port *p)
	{
	u8 mode = !!(p->flags & BR_HAIRPIN_MODE);

	if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) \|\|
	nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) \|\|
	nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) \|\|
	nla_put_u8(skb, IFLA_BRPORT_MODE, mode) \|\|
	nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) \|\|
	nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) \|\|
	nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) \|\|
	nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) \|\|
	nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) \|\|
	nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)))
	return -EMSGSIZE;

	return 0;
	}

	static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
	u16 vid_end, u16 flags)
	{
	struct bridge_vlan_info vinfo;

	if ((vid_end - vid_start) > 0) {
	/* add range to skb */
	vinfo.vid = vid_start;
	vinfo.flags = flags \| BRIDGE_VLAN_INFO_RANGE_BEGIN;
	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	sizeof(vinfo), &vinfo))
	goto nla_put_failure;

	vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;

	vinfo.vid = vid_end;
	vinfo.flags = flags \| BRIDGE_VLAN_INFO_RANGE_END;
	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	sizeof(vinfo), &vinfo))
	goto nla_put_failure;
	} else {
	vinfo.vid = vid_start;
	vinfo.flags = flags;
	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	sizeof(vinfo), &vinfo))
	goto nla_put_failure;
	}

	return 0;

	nla_put_failure:
	return -EMSGSIZE;
	}

	static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
	const struct net_port_vlans *pv)
	{
	u16 vid_range_start = 0, vid_range_end = 0;
	u16 vid_range_flags = 0;
	u16 pvid, vid, flags;
	int err = 0;

	/* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
	* and mark vlan info with begin and end flags
	* if vlaninfo represents a range
	*/
	pvid = br_get_pvid(pv);
	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
	flags = 0;
	if (vid == pvid)
	flags \|= BRIDGE_VLAN_INFO_PVID;

	if (test_bit(vid, pv->untagged_bitmap))
	flags \|= BRIDGE_VLAN_INFO_UNTAGGED;

	if (vid_range_start == 0) {
	goto initvars;
	} else if ((vid - vid_range_end) == 1 &&
	flags == vid_range_flags) {
	vid_range_end = vid;
	continue;
	} else {
	err = br_fill_ifvlaninfo_range(skb, vid_range_start,
	vid_range_end,
	vid_range_flags);
	if (err)
	return err;
	}

	initvars:
	vid_range_start = vid;
	vid_range_end = vid;
	vid_range_flags = flags;
	}

	if (vid_range_start != 0) {
	/* Call it once more to send any left over vlans */
	err = br_fill_ifvlaninfo_range(skb, vid_range_start,
	vid_range_end,
	vid_range_flags);
	if (err)
	return err;
	}

	return 0;
	}

	static int br_fill_ifvlaninfo(struct sk_buff *skb,
	const struct net_port_vlans *pv)
	{
	struct bridge_vlan_info vinfo;
	u16 pvid, vid;

	pvid = br_get_pvid(pv);
	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
	vinfo.vid = vid;
	vinfo.flags = 0;
	if (vid == pvid)
	vinfo.flags \|= BRIDGE_VLAN_INFO_PVID;

	if (test_bit(vid, pv->untagged_bitmap))
	vinfo.flags \|= BRIDGE_VLAN_INFO_UNTAGGED;

	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	sizeof(vinfo), &vinfo))
	goto nla_put_failure;
	}

	return 0;

	nla_put_failure:
	return -EMSGSIZE;
	}

	/*
	* Create one netlink message for one interface
	* Contains port and master info as well as carrier and bridge state.
	*/
	static int br_fill_ifinfo(struct sk_buff *skb,
	const struct net_bridge_port *port,
	u32 pid, u32 seq, int event, unsigned int flags,
	u32 filter_mask, const struct net_device *dev)
	{
	const struct net_bridge *br;
	struct ifinfomsg *hdr;
	struct nlmsghdr *nlh;
	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;

	if (port)
	br = port->br;
	else
	br = netdev_priv(dev);

	br_debug(br, "br_fill_info event %d port %s master %s\n",
	event, dev->name, br->dev->name);

	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
	if (nlh == NULL)
	return -EMSGSIZE;

	hdr = nlmsg_data(nlh);
	hdr->ifi_family = AF_BRIDGE;
	hdr->__ifi_pad = 0;
	hdr->ifi_type = dev->type;
	hdr->ifi_index = dev->ifindex;
	hdr->ifi_flags = dev_get_flags(dev);
	hdr->ifi_change = 0;

	if (nla_put_string(skb, IFLA_IFNAME, dev->name) \|\|
	nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) \|\|
	nla_put_u32(skb, IFLA_MTU, dev->mtu) \|\|
	nla_put_u8(skb, IFLA_OPERSTATE, operstate) \|\|
	(dev->addr_len &&
	nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) \|\|
	(dev->ifindex != dev->iflink &&
	nla_put_u32(skb, IFLA_LINK, dev->iflink)))
	goto nla_put_failure;

	if (event == RTM_NEWLINK && port) {
	struct nlattr *nest
	= nla_nest_start(skb, IFLA_PROTINFO \| NLA_F_NESTED);

	if (nest == NULL \|\| br_port_fill_attrs(skb, port) < 0)
	goto nla_put_failure;
	nla_nest_end(skb, nest);
	}

	/* Check if the VID information is requested */
	if ((filter_mask & RTEXT_FILTER_BRVLAN) \|\|
	(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
	const struct net_port_vlans *pv;
	struct nlattr *af;
	int err;

	if (port)
	pv = nbp_get_vlan_info(port);
	else
	pv = br_get_vlan_info(br);

	if (!pv \|\| bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
	goto done;

	af = nla_nest_start(skb, IFLA_AF_SPEC);
	if (!af)
	goto nla_put_failure;

	if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
	err = br_fill_ifvlaninfo_compressed(skb, pv);
	else
	err = br_fill_ifvlaninfo(skb, pv);
	if (err)
	goto nla_put_failure;
	nla_nest_end(skb, af);
	}

	done:
	nlmsg_end(skb, nlh);
	return 0;

	nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
	}

	/*
	* Notify listeners of a change in port information
	*/
	void br_ifinfo_notify(int event, struct net_bridge_port *port)
	{
	struct net *net;
	struct sk_buff *skb;
	int err = -ENOBUFS;

	if (!port)
	return;

	net = dev_net(port->dev);
	br_debug(port->br, "port %u(%s) event %d\n",
	(unsigned int)port->port_no, port->dev->name, event);

	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
	if (skb == NULL)
	goto errout;

	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
	if (err < 0) {
	/* -EMSGSIZE implies BUG in br_nlmsg_size() */
	WARN_ON(err == -EMSGSIZE);
	kfree_skb(skb);
	goto errout;
	}
	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
	return;
	errout:
	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
	}


	/*
	* Dump information about all ports, in response to GETLINK
	*/
	int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
	struct net_device *dev, u32 filter_mask)
	{
	struct net_bridge_port *port = br_port_get_rtnl(dev);

	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
	!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
	return 0;

	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
	filter_mask, dev);
	}

	static int br_vlan_info(struct net_bridge br, struct net_bridge_port p,
	int cmd, struct bridge_vlan_info *vinfo)
	{
	int err = 0;

	switch (cmd) {
	case RTM_SETLINK:
	if (p) {
	err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
	if (err)
	break;

	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	err = br_vlan_add(p->br, vinfo->vid,
	vinfo->flags);
	} else {
	err = br_vlan_add(br, vinfo->vid, vinfo->flags);
	}
	break;

	case RTM_DELLINK:
	if (p) {
	nbp_vlan_delete(p, vinfo->vid);
	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	br_vlan_delete(p->br, vinfo->vid);
	} else {
	br_vlan_delete(br, vinfo->vid);
	}
	break;
	}

	return err;
	}

	static int br_afspec(struct net_bridge *br,
	struct net_bridge_port *p,
	struct nlattr *af_spec,
	int cmd)
	{
	struct bridge_vlan_info *vinfo_start = NULL;
	struct bridge_vlan_info *vinfo = NULL;
	struct nlattr *attr;
	int err = 0;
	int rem;

	nla_for_each_nested(attr, af_spec, rem) {
	if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
	continue;
	if (nla_len(attr) != sizeof(struct bridge_vlan_info))
	return -EINVAL;
	vinfo = nla_data(attr);
	if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
	if (vinfo_start)
	return -EINVAL;
	vinfo_start = vinfo;
	continue;
	}

	if (vinfo_start) {
	struct bridge_vlan_info tmp_vinfo;
	int v;

	if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
	return -EINVAL;

	if (vinfo->vid <= vinfo_start->vid)
	return -EINVAL;

	memcpy(&tmp_vinfo, vinfo_start,
	sizeof(struct bridge_vlan_info));

	for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
	tmp_vinfo.vid = v;
	err = br_vlan_info(br, p, cmd, &tmp_vinfo);
	if (err)
	break;
	}
	vinfo_start = NULL;
	} else {
	err = br_vlan_info(br, p, cmd, vinfo);
	}
	if (err)
	break;
	}

	return err;
	}

	static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
	[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
	[IFLA_BRPORT_COST] = { .type = NLA_U32 },
	[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
	[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
	[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
	[IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
	[IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
	[IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
	[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
	};

	/* Change the state of the port and notify spanning tree */
	static int br_set_port_state(struct net_bridge_port *p, u8 state)
	{
	if (state > BR_STATE_BLOCKING)
	return -EINVAL;

	/* if kernel STP is running, don't allow changes */
	if (p->br->stp_enabled == BR_KERNEL_STP)
	return -EBUSY;

	/* if device is not up, change is not allowed
	* if link is not present, only allowable state is disabled
	*/
	if (!netif_running(p->dev) \|\|
	(!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
	return -ENETDOWN;

	br_set_state(p, state);
	br_log_state(p);
	br_port_state_selection(p->br);
	return 0;
	}

	/* Set/clear or port flags based on attribute */
	static void br_set_port_flag(struct net_bridge_port p, struct nlattr tb[],
	int attrtype, unsigned long mask)
	{
	if (tb[attrtype]) {
	u8 flag = nla_get_u8(tb[attrtype]);
	if (flag)
	p->flags \|= mask;
	else
	p->flags &= ~mask;
	}
	}

	/* Process bridge protocol info on port */
	static int br_setport(struct net_bridge_port p, struct nlattr tb[])
	{
	int err;
	unsigned long old_flags = p->flags;

	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
	br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
	br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
	br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
	br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);

	if (tb[IFLA_BRPORT_COST]) {
	err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
	if (err)
	return err;
	}

	if (tb[IFLA_BRPORT_PRIORITY]) {
	err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
	if (err)
	return err;
	}

	if (tb[IFLA_BRPORT_STATE]) {
	err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
	if (err)
	return err;
	}

	br_port_flags_change(p, old_flags ^ p->flags);
	return 0;
	}

	/* Change state and parameters on port. */
	int br_setlink(struct net_device dev, struct nlmsghdr nlh, u16 flags)
	{
	struct nlattr *protinfo;
	struct nlattr *afspec;
	struct net_bridge_port *p;
	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
	int err = 0, ret_offload = 0;

	protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
	if (!protinfo && !afspec)
	return 0;

	p = br_port_get_rtnl(dev);
	/* We want to accept dev as bridge itself if the AF_SPEC
	* is set to see if someone is setting vlan info on the bridge
	*/
	if (!p && !afspec)
	return -EINVAL;

	if (p && protinfo) {
	if (protinfo->nla_type & NLA_F_NESTED) {
	err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
	protinfo, br_port_policy);
	if (err)
	return err;

	spin_lock_bh(&p->br->lock);
	err = br_setport(p, tb);
	spin_unlock_bh(&p->br->lock);
	} else {
	/* Binary compatibility with old RSTP */
	if (nla_len(protinfo) < sizeof(u8))
	return -EINVAL;

	spin_lock_bh(&p->br->lock);
	err = br_set_port_state(p, nla_get_u8(protinfo));
	spin_unlock_bh(&p->br->lock);
	}
	if (err)
	goto out;
	}

	if (afspec) {
	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	afspec, RTM_SETLINK);
	}

	if (p && !(flags & BRIDGE_FLAGS_SELF)) {
	/* set bridge attributes in hardware if supported
	*/
	ret_offload = netdev_switch_port_bridge_setlink(dev, nlh,
	flags);
	if (ret_offload && ret_offload != -EOPNOTSUPP)
	br_warn(p->br, "error setting attrs on port %u(%s)\n",
	(unsigned int)p->port_no, p->dev->name);
	}

	if (err == 0)
	br_ifinfo_notify(RTM_NEWLINK, p);
	out:
	return err;
	}

	/* Delete port information */
	int br_dellink(struct net_device dev, struct nlmsghdr nlh, u16 flags)
	{
	struct nlattr *afspec;
	struct net_bridge_port *p;
	int err = 0, ret_offload = 0;

	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
	if (!afspec)
	return 0;

	p = br_port_get_rtnl(dev);
	/* We want to accept dev as bridge itself as well */
	if (!p && !(dev->priv_flags & IFF_EBRIDGE))
	return -EINVAL;

	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	afspec, RTM_DELLINK);
	if (err == 0)
	/* Send RTM_NEWLINK because userspace
	* expects RTM_NEWLINK for vlan dels
	*/
	br_ifinfo_notify(RTM_NEWLINK, p);

	if (p && !(flags & BRIDGE_FLAGS_SELF)) {
	/* del bridge attributes in hardware
	*/
	ret_offload = netdev_switch_port_bridge_dellink(dev, nlh,
	flags);
	if (ret_offload && ret_offload != -EOPNOTSUPP)
	br_warn(p->br, "error deleting attrs on port %u (%s)\n",
	(unsigned int)p->port_no, p->dev->name);
	}

	return err;
	}
	static int br_validate(struct nlattr tb[], struct nlattr data[])
	{
	if (tb[IFLA_ADDRESS]) {
	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	return -EINVAL;
	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	return -EADDRNOTAVAIL;
	}

	return 0;
	}

	static int br_dev_newlink(struct net src_net, struct net_device dev,
	struct nlattr tb[], struct nlattr data[])
	{
	struct net_bridge *br = netdev_priv(dev);

	if (tb[IFLA_ADDRESS]) {
	spin_lock_bh(&br->lock);
	br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
	spin_unlock_bh(&br->lock);
	}

	return register_netdevice(dev);
	}

	static int br_port_slave_changelink(struct net_device *brdev,
	struct net_device *dev,
	struct nlattr *tb[],
	struct nlattr *data[])
	{
	if (!data)
	return 0;
	return br_setport(br_port_get_rtnl(dev), data);
	}

	static int br_port_fill_slave_info(struct sk_buff *skb,
	const struct net_device *brdev,
	const struct net_device *dev)
	{
	return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
	}

	static size_t br_port_get_slave_size(const struct net_device *brdev,
	const struct net_device *dev)
	{
	return br_port_info_size();
	}

	static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
	[IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
	[IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
	[IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
	};

	static int br_changelink(struct net_device brdev, struct nlattr tb[],
	struct nlattr *data[])
	{
	struct net_bridge *br = netdev_priv(brdev);
	int err;

	if (!data)
	return 0;

	if (data[IFLA_BR_FORWARD_DELAY]) {
	err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
	if (err)
	return err;
	}

	if (data[IFLA_BR_HELLO_TIME]) {
	err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
	if (err)
	return err;
	}

	if (data[IFLA_BR_MAX_AGE]) {
	err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
	if (err)
	return err;
	}

	return 0;
	}

	static size_t br_get_size(const struct net_device *brdev)
	{
	return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
	nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
	nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
	0;
	}

	static int br_fill_info(struct sk_buff skb, const struct net_device brdev)
	{
	struct net_bridge *br = netdev_priv(brdev);
	u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
	u32 hello_time = jiffies_to_clock_t(br->hello_time);
	u32 age_time = jiffies_to_clock_t(br->max_age);

	if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) \|\|
	nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) \|\|
	nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
	return -EMSGSIZE;

	return 0;
	}

	static size_t br_get_link_af_size(const struct net_device *dev)
	{
	struct net_port_vlans *pv;

	if (br_port_exists(dev))
	pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
	else if (dev->priv_flags & IFF_EBRIDGE)
	pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
	else
	return 0;

	if (!pv)
	return 0;

	/* Each VLAN is returned in bridge_vlan_info along with flags */
	return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
	}

	static struct rtnl_af_ops br_af_ops __read_mostly = {
	.family = AF_BRIDGE,
	.get_link_af_size = br_get_link_af_size,
	};

	struct rtnl_link_ops br_link_ops __read_mostly = {
	.kind = "bridge",
	.priv_size = sizeof(struct net_bridge),
	.setup = br_dev_setup,
	.maxtype = IFLA_BRPORT_MAX,
	.policy = br_policy,
	.validate = br_validate,
	.newlink = br_dev_newlink,
	.changelink = br_changelink,
	.dellink = br_dev_delete,
	.get_size = br_get_size,
	.fill_info = br_fill_info,

	.slave_maxtype = IFLA_BRPORT_MAX,
	.slave_policy = br_port_policy,
	.slave_changelink = br_port_slave_changelink,
	.get_slave_size = br_port_get_slave_size,
	.fill_slave_info = br_port_fill_slave_info,
	};

	int __init br_netlink_init(void)
	{
	int err;

	br_mdb_init();
	rtnl_af_register(&br_af_ops);

	err = rtnl_link_register(&br_link_ops);
	if (err)
	goto out_af;

	return 0;

	out_af:
	rtnl_af_unregister(&br_af_ops);
	br_mdb_uninit();
	return err;
	}

	void br_netlink_fini(void)
	{
	br_mdb_uninit();
	rtnl_af_unregister(&br_af_ops);
	rtnl_link_unregister(&br_link_ops);
	}