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br_netlink.c
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br_netlink.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Bridge netlink control interface
*
* Authors:
* Stephen Hemminger <[email protected]>
*/
#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 <uapi/linux/if_bridge.h>
#include "br_private.h"
#include "br_private_stp.h"
#include "br_private_cfm.h"
#include "br_private_tunnel.h"
#include "br_private_mcast_eht.h"
static int __get_num_vlan_infos(struct net_bridge_vlan_group *vg,
u32 filter_mask)
{
struct net_bridge_vlan *v;
u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0;
u16 flags, pvid;
int num_vlans = 0;
if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
return 0;
pvid = br_get_pvid(vg);
/* Count number of vlan infos */
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
flags = 0;
/* only a context, bridge vlan not activated */
if (!br_vlan_should_use(v))
continue;
if (v->vid == pvid)
flags |= BRIDGE_VLAN_INFO_PVID;
if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
flags |= BRIDGE_VLAN_INFO_UNTAGGED;
if (vid_range_start == 0) {
goto initvars;
} else if ((v->vid - vid_range_end) == 1 &&
flags == vid_range_flags) {
vid_range_end = v->vid;
continue;
} else {
if ((vid_range_end - vid_range_start) > 0)
num_vlans += 2;
else
num_vlans += 1;
}
initvars:
vid_range_start = v->vid;
vid_range_end = v->vid;
vid_range_flags = flags;
}
if (vid_range_start != 0) {
if ((vid_range_end - vid_range_start) > 0)
num_vlans += 2;
else
num_vlans += 1;
}
return num_vlans;
}
static int br_get_num_vlan_infos(struct net_bridge_vlan_group *vg,
u32 filter_mask)
{
int num_vlans;
if (!vg)
return 0;
if (filter_mask & RTEXT_FILTER_BRVLAN)
return vg->num_vlans;
rcu_read_lock();
num_vlans = __get_num_vlan_infos(vg, filter_mask);
rcu_read_unlock();
return num_vlans;
}
static size_t br_get_link_af_size_filtered(const struct net_device *dev,
u32 filter_mask)
{
struct net_bridge_vlan_group *vg = NULL;
struct net_bridge_port *p = NULL;
struct net_bridge *br = NULL;
u32 num_cfm_peer_mep_infos;
u32 num_cfm_mep_infos;
size_t vinfo_sz = 0;
int num_vlan_infos;
rcu_read_lock();
if (netif_is_bridge_port(dev)) {
p = br_port_get_check_rcu(dev);
if (p)
vg = nbp_vlan_group_rcu(p);
} else if (dev->priv_flags & IFF_EBRIDGE) {
br = netdev_priv(dev);
vg = br_vlan_group_rcu(br);
}
num_vlan_infos = br_get_num_vlan_infos(vg, filter_mask);
rcu_read_unlock();
if (p && (p->flags & BR_VLAN_TUNNEL))
vinfo_sz += br_get_vlan_tunnel_info_size(vg);
/* Each VLAN is returned in bridge_vlan_info along with flags */
vinfo_sz += num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
if (!(filter_mask & RTEXT_FILTER_CFM_STATUS))
return vinfo_sz;
if (!br)
return vinfo_sz;
/* CFM status info must be added */
br_cfm_mep_count(br, &num_cfm_mep_infos);
br_cfm_peer_mep_count(br, &num_cfm_peer_mep_infos);
vinfo_sz += nla_total_size(0); /* IFLA_BRIDGE_CFM */
/* For each status struct the MEP instance (u32) is added */
/* MEP instance (u32) + br_cfm_mep_status */
vinfo_sz += num_cfm_mep_infos *
/*IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE */
(nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN */
+ nla_total_size(sizeof(u32)));
/* MEP instance (u32) + br_cfm_cc_peer_status */
vinfo_sz += num_cfm_peer_mep_infos *
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE */
(nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE */
+ nla_total_size(sizeof(u8))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE */
+ nla_total_size(sizeof(u8))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN */
+ nla_total_size(sizeof(u32))
/* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN */
+ nla_total_size(sizeof(u32)));
return vinfo_sz;
}
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_MCAST_TO_UCAST */
+ nla_total_size(1) /* IFLA_BRPORT_LEARNING */
+ nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
+ nla_total_size(1) /* IFLA_BRPORT_MCAST_FLOOD */
+ nla_total_size(1) /* IFLA_BRPORT_BCAST_FLOOD */
+ nla_total_size(1) /* IFLA_BRPORT_PROXYARP */
+ nla_total_size(1) /* IFLA_BRPORT_PROXYARP_WIFI */
+ nla_total_size(1) /* IFLA_BRPORT_VLAN_TUNNEL */
+ nla_total_size(1) /* IFLA_BRPORT_NEIGH_SUPPRESS */
+ nla_total_size(1) /* IFLA_BRPORT_ISOLATED */
+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_ROOT_ID */
+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_BRIDGE_ID */
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_DESIGNATED_PORT */
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_DESIGNATED_COST */
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_ID */
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_NO */
+ nla_total_size(sizeof(u8)) /* IFLA_BRPORT_TOPOLOGY_CHANGE_ACK */
+ nla_total_size(sizeof(u8)) /* IFLA_BRPORT_CONFIG_PENDING */
+ nla_total_size_64bit(sizeof(u64)) /* IFLA_BRPORT_MESSAGE_AGE_TIMER */
+ nla_total_size_64bit(sizeof(u64)) /* IFLA_BRPORT_FORWARD_DELAY_TIMER */
+ nla_total_size_64bit(sizeof(u64)) /* IFLA_BRPORT_HOLD_TIMER */
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ nla_total_size(sizeof(u8)) /* IFLA_BRPORT_MULTICAST_ROUTER */
#endif
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_GROUP_FWD_MASK */
+ nla_total_size(sizeof(u8)) /* IFLA_BRPORT_MRP_RING_OPEN */
+ nla_total_size(sizeof(u8)) /* IFLA_BRPORT_MRP_IN_OPEN */
+ nla_total_size(sizeof(u32)) /* IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT */
+ nla_total_size(sizeof(u32)) /* IFLA_BRPORT_MCAST_EHT_HOSTS_CNT */
+ 0;
}
static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
{
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 */
+ nla_total_size(br_get_link_af_size_filtered(dev,
filter_mask)) /* IFLA_AF_SPEC */
+ nla_total_size(4); /* IFLA_BRPORT_BACKUP_PORT */
}
static int br_port_fill_attrs(struct sk_buff *skb,
const struct net_bridge_port *p)
{
u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
struct net_bridge_port *backup_p;
u64 timerval;
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_MCAST_TO_UCAST,
!!(p->flags & BR_MULTICAST_TO_UNICAST)) ||
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_MCAST_FLOOD,
!!(p->flags & BR_MCAST_FLOOD)) ||
nla_put_u8(skb, IFLA_BRPORT_BCAST_FLOOD,
!!(p->flags & BR_BCAST_FLOOD)) ||
nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
!!(p->flags & BR_PROXYARP_WIFI)) ||
nla_put(skb, IFLA_BRPORT_ROOT_ID, sizeof(struct ifla_bridge_id),
&p->designated_root) ||
nla_put(skb, IFLA_BRPORT_BRIDGE_ID, sizeof(struct ifla_bridge_id),
&p->designated_bridge) ||
nla_put_u16(skb, IFLA_BRPORT_DESIGNATED_PORT, p->designated_port) ||
nla_put_u16(skb, IFLA_BRPORT_DESIGNATED_COST, p->designated_cost) ||
nla_put_u16(skb, IFLA_BRPORT_ID, p->port_id) ||
nla_put_u16(skb, IFLA_BRPORT_NO, p->port_no) ||
nla_put_u8(skb, IFLA_BRPORT_TOPOLOGY_CHANGE_ACK,
p->topology_change_ack) ||
nla_put_u8(skb, IFLA_BRPORT_CONFIG_PENDING, p->config_pending) ||
nla_put_u8(skb, IFLA_BRPORT_VLAN_TUNNEL, !!(p->flags &
BR_VLAN_TUNNEL)) ||
nla_put_u16(skb, IFLA_BRPORT_GROUP_FWD_MASK, p->group_fwd_mask) ||
nla_put_u8(skb, IFLA_BRPORT_NEIGH_SUPPRESS,
!!(p->flags & BR_NEIGH_SUPPRESS)) ||
nla_put_u8(skb, IFLA_BRPORT_MRP_RING_OPEN, !!(p->flags &
BR_MRP_LOST_CONT)) ||
nla_put_u8(skb, IFLA_BRPORT_MRP_IN_OPEN,
!!(p->flags & BR_MRP_LOST_IN_CONT)) ||
nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
return -EMSGSIZE;
timerval = br_timer_value(&p->message_age_timer);
if (nla_put_u64_64bit(skb, IFLA_BRPORT_MESSAGE_AGE_TIMER, timerval,
IFLA_BRPORT_PAD))
return -EMSGSIZE;
timerval = br_timer_value(&p->forward_delay_timer);
if (nla_put_u64_64bit(skb, IFLA_BRPORT_FORWARD_DELAY_TIMER, timerval,
IFLA_BRPORT_PAD))
return -EMSGSIZE;
timerval = br_timer_value(&p->hold_timer);
if (nla_put_u64_64bit(skb, IFLA_BRPORT_HOLD_TIMER, timerval,
IFLA_BRPORT_PAD))
return -EMSGSIZE;
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
if (nla_put_u8(skb, IFLA_BRPORT_MULTICAST_ROUTER,
p->multicast_router) ||
nla_put_u32(skb, IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT,
p->multicast_eht_hosts_limit) ||
nla_put_u32(skb, IFLA_BRPORT_MCAST_EHT_HOSTS_CNT,
p->multicast_eht_hosts_cnt))
return -EMSGSIZE;
#endif
/* we might be called only with br->lock */
rcu_read_lock();
backup_p = rcu_dereference(p->backup_port);
if (backup_p)
nla_put_u32(skb, IFLA_BRPORT_BACKUP_PORT,
backup_p->dev->ifindex);
rcu_read_unlock();
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.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,
struct net_bridge_vlan_group *vg)
{
struct net_bridge_vlan *v;
u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0;
u16 flags, pvid;
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(vg);
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
flags = 0;
if (!br_vlan_should_use(v))
continue;
if (v->vid == pvid)
flags |= BRIDGE_VLAN_INFO_PVID;
if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
flags |= BRIDGE_VLAN_INFO_UNTAGGED;
if (vid_range_start == 0) {
goto initvars;
} else if ((v->vid - vid_range_end) == 1 &&
flags == vid_range_flags) {
vid_range_end = v->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 = v->vid;
vid_range_end = v->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,
struct net_bridge_vlan_group *vg)
{
struct bridge_vlan_info vinfo;
struct net_bridge_vlan *v;
u16 pvid;
pvid = br_get_pvid(vg);
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
if (!br_vlan_should_use(v))
continue;
vinfo.vid = v->vid;
vinfo.flags = 0;
if (v->vid == pvid)
vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
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,
bool getlink)
{
u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
struct nlattr *af = NULL;
struct net_bridge *br;
struct ifinfomsg *hdr;
struct nlmsghdr *nlh;
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_get_iflink(dev) &&
nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
goto nla_put_failure;
if (event == RTM_NEWLINK && port) {
struct nlattr *nest;
nest = nla_nest_start(skb, IFLA_PROTINFO);
if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
}
if (filter_mask & (RTEXT_FILTER_BRVLAN |
RTEXT_FILTER_BRVLAN_COMPRESSED |
RTEXT_FILTER_MRP |
RTEXT_FILTER_CFM_CONFIG |
RTEXT_FILTER_CFM_STATUS)) {
af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
if (!af)
goto nla_put_failure;
}
/* Check if the VID information is requested */
if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
struct net_bridge_vlan_group *vg;
int err;
/* RCU needed because of the VLAN locking rules (rcu || rtnl) */
rcu_read_lock();
if (port)
vg = nbp_vlan_group_rcu(port);
else
vg = br_vlan_group_rcu(br);
if (!vg || !vg->num_vlans) {
rcu_read_unlock();
goto done;
}
if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
err = br_fill_ifvlaninfo_compressed(skb, vg);
else
err = br_fill_ifvlaninfo(skb, vg);
if (port && (port->flags & BR_VLAN_TUNNEL))
err = br_fill_vlan_tunnel_info(skb, vg);
rcu_read_unlock();
if (err)
goto nla_put_failure;
}
if (filter_mask & RTEXT_FILTER_MRP) {
int err;
if (!br_mrp_enabled(br) || port)
goto done;
rcu_read_lock();
err = br_mrp_fill_info(skb, br);
rcu_read_unlock();
if (err)
goto nla_put_failure;
}
if (filter_mask & (RTEXT_FILTER_CFM_CONFIG | RTEXT_FILTER_CFM_STATUS)) {
struct nlattr *cfm_nest = NULL;
int err;
if (!br_cfm_created(br) || port)
goto done;
cfm_nest = nla_nest_start(skb, IFLA_BRIDGE_CFM);
if (!cfm_nest)
goto nla_put_failure;
if (filter_mask & RTEXT_FILTER_CFM_CONFIG) {
rcu_read_lock();
err = br_cfm_config_fill_info(skb, br);
rcu_read_unlock();
if (err)
goto nla_put_failure;
}
if (filter_mask & RTEXT_FILTER_CFM_STATUS) {
rcu_read_lock();
err = br_cfm_status_fill_info(skb, br, getlink);
rcu_read_unlock();
if (err)
goto nla_put_failure;
}
nla_nest_end(skb, cfm_nest);
}
done:
if (af)
nla_nest_end(skb, af);
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
void br_info_notify(int event, const struct net_bridge *br,
const struct net_bridge_port *port, u32 filter)
{
struct net_device *dev;
struct sk_buff *skb;
int err = -ENOBUFS;
struct net *net;
u16 port_no = 0;
if (WARN_ON(!port && !br))
return;
if (port) {
dev = port->dev;
br = port->br;
port_no = port->port_no;
} else {
dev = br->dev;
}
net = dev_net(dev);
br_debug(br, "port %u(%s) event %d\n", port_no, dev->name, event);
skb = nlmsg_new(br_nlmsg_size(dev, filter), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev, false);
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);
}
/* Notify listeners of a change in bridge or port information */
void br_ifinfo_notify(int event, const struct net_bridge *br,
const struct net_bridge_port *port)
{
u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
return br_info_notify(event, br, port, filter);
}
/*
* 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, int nlflags)
{
struct net_bridge_port *port = br_port_get_rtnl(dev);
if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) &&
!(filter_mask & RTEXT_FILTER_MRP) &&
!(filter_mask & RTEXT_FILTER_CFM_CONFIG) &&
!(filter_mask & RTEXT_FILTER_CFM_STATUS))
return 0;
return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
filter_mask, dev, true);
}
static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
int cmd, struct bridge_vlan_info *vinfo, bool *changed,
struct netlink_ext_ack *extack)
{
bool curr_change;
int err = 0;
switch (cmd) {
case RTM_SETLINK:
if (p) {
/* if the MASTER flag is set this will act on the global
* per-VLAN entry as well
*/
err = nbp_vlan_add(p, vinfo->vid, vinfo->flags,
&curr_change, extack);
} else {
vinfo->flags |= BRIDGE_VLAN_INFO_BRENTRY;
err = br_vlan_add(br, vinfo->vid, vinfo->flags,
&curr_change, extack);
}
if (curr_change)
*changed = true;
break;
case RTM_DELLINK:
if (p) {
if (!nbp_vlan_delete(p, vinfo->vid))
*changed = true;
if ((vinfo->flags & BRIDGE_VLAN_INFO_MASTER) &&
!br_vlan_delete(p->br, vinfo->vid))
*changed = true;
} else if (!br_vlan_delete(br, vinfo->vid)) {
*changed = true;
}
break;
}
return err;
}
int br_process_vlan_info(struct net_bridge *br,
struct net_bridge_port *p, int cmd,
struct bridge_vlan_info *vinfo_curr,
struct bridge_vlan_info **vinfo_last,
bool *changed,
struct netlink_ext_ack *extack)
{
int err, rtm_cmd;
if (!br_vlan_valid_id(vinfo_curr->vid, extack))
return -EINVAL;
/* needed for vlan-only NEWVLAN/DELVLAN notifications */
rtm_cmd = br_afspec_cmd_to_rtm(cmd);
if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
return -EINVAL;
*vinfo_last = vinfo_curr;
return 0;
}
if (*vinfo_last) {
struct bridge_vlan_info tmp_vinfo;
int v, v_change_start = 0;
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
return -EINVAL;
memcpy(&tmp_vinfo, *vinfo_last,
sizeof(struct bridge_vlan_info));
for (v = (*vinfo_last)->vid; v <= vinfo_curr->vid; v++) {
bool curr_change = false;
tmp_vinfo.vid = v;
err = br_vlan_info(br, p, cmd, &tmp_vinfo, &curr_change,
extack);
if (err)
break;
if (curr_change) {
*changed = curr_change;
if (!v_change_start)
v_change_start = v;
} else {
/* nothing to notify yet */
if (!v_change_start)
continue;
br_vlan_notify(br, p, v_change_start,
v - 1, rtm_cmd);
v_change_start = 0;
}
cond_resched();
}
/* v_change_start is set only if the last/whole range changed */
if (v_change_start)
br_vlan_notify(br, p, v_change_start,
v - 1, rtm_cmd);
*vinfo_last = NULL;
return err;
}
err = br_vlan_info(br, p, cmd, vinfo_curr, changed, extack);
if (*changed)
br_vlan_notify(br, p, vinfo_curr->vid, 0, rtm_cmd);
return err;
}
static int br_afspec(struct net_bridge *br,
struct net_bridge_port *p,
struct nlattr *af_spec,
int cmd, bool *changed,
struct netlink_ext_ack *extack)
{
struct bridge_vlan_info *vinfo_curr = NULL;
struct bridge_vlan_info *vinfo_last = NULL;
struct nlattr *attr;
struct vtunnel_info tinfo_last = {};
struct vtunnel_info tinfo_curr = {};
int err = 0, rem;
nla_for_each_nested(attr, af_spec, rem) {
err = 0;
switch (nla_type(attr)) {
case IFLA_BRIDGE_VLAN_TUNNEL_INFO:
if (!p || !(p->flags & BR_VLAN_TUNNEL))
return -EINVAL;
err = br_parse_vlan_tunnel_info(attr, &tinfo_curr);
if (err)
return err;
err = br_process_vlan_tunnel_info(br, p, cmd,
&tinfo_curr,
&tinfo_last,
changed);
if (err)
return err;
break;
case IFLA_BRIDGE_VLAN_INFO:
if (nla_len(attr) != sizeof(struct bridge_vlan_info))
return -EINVAL;
vinfo_curr = nla_data(attr);
err = br_process_vlan_info(br, p, cmd, vinfo_curr,
&vinfo_last, changed,
extack);
if (err)
return err;
break;
case IFLA_BRIDGE_MRP:
err = br_mrp_parse(br, p, attr, cmd, extack);
if (err)
return err;
break;
case IFLA_BRIDGE_CFM:
err = br_cfm_parse(br, p, attr, cmd, extack);
if (err)
return 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 },
[IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 },
[IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 },
[IFLA_BRPORT_MULTICAST_ROUTER] = { .type = NLA_U8 },
[IFLA_BRPORT_MCAST_TO_UCAST] = { .type = NLA_U8 },
[IFLA_BRPORT_MCAST_FLOOD] = { .type = NLA_U8 },
[IFLA_BRPORT_BCAST_FLOOD] = { .type = NLA_U8 },
[IFLA_BRPORT_VLAN_TUNNEL] = { .type = NLA_U8 },
[IFLA_BRPORT_GROUP_FWD_MASK] = { .type = NLA_U16 },
[IFLA_BRPORT_NEIGH_SUPPRESS] = { .type = NLA_U8 },
[IFLA_BRPORT_ISOLATED] = { .type = NLA_U8 },
[IFLA_BRPORT_BACKUP_PORT] = { .type = NLA_U32 },
[IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT] = { .type = NLA_U32 },
};
/* 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_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])
return;
if (nla_get_u8(tb[attrtype]))
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[],
struct netlink_ext_ack *extack)
{
unsigned long old_flags, changed_mask;
bool br_vlan_tunnel_old;
int err;
old_flags = p->flags;
br_vlan_tunnel_old = (old_flags & BR_VLAN_TUNNEL) ? true : false;
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_MCAST_FLOOD, BR_MCAST_FLOOD);
br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST,
BR_MULTICAST_TO_UNICAST);
br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_SUPPRESS, BR_NEIGH_SUPPRESS);
br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
changed_mask = old_flags ^ p->flags;
err = br_switchdev_set_port_flag(p, p->flags, changed_mask, extack);
if (err) {
p->flags = old_flags;
return err;
}
if (br_vlan_tunnel_old && !(p->flags & BR_VLAN_TUNNEL))
nbp_vlan_tunnel_info_flush(p);
br_port_flags_change(p, changed_mask);
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;
}
if (tb[IFLA_BRPORT_FLUSH])
br_fdb_delete_by_port(p->br, p, 0, 0);
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
if (tb[IFLA_BRPORT_MULTICAST_ROUTER]) {
u8 mcast_router = nla_get_u8(tb[IFLA_BRPORT_MULTICAST_ROUTER]);
err = br_multicast_set_port_router(p, mcast_router);
if (err)
return err;
}
if (tb[IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT]) {
u32 hlimit;
hlimit = nla_get_u32(tb[IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT]);
err = br_multicast_eht_set_hosts_limit(p, hlimit);
if (err)
return err;
}
#endif
if (tb[IFLA_BRPORT_GROUP_FWD_MASK]) {
u16 fwd_mask = nla_get_u16(tb[IFLA_BRPORT_GROUP_FWD_MASK]);
if (fwd_mask & BR_GROUPFWD_MACPAUSE)
return -EINVAL;
p->group_fwd_mask = fwd_mask;
}
if (tb[IFLA_BRPORT_BACKUP_PORT]) {
struct net_device *backup_dev = NULL;
u32 backup_ifindex;
backup_ifindex = nla_get_u32(tb[IFLA_BRPORT_BACKUP_PORT]);
if (backup_ifindex) {
backup_dev = __dev_get_by_index(dev_net(p->dev),
backup_ifindex);
if (!backup_dev)
return -ENOENT;
}
err = nbp_backup_change(p, backup_dev);
if (err)
return err;
}
return 0;
}
/* Change state and parameters on port. */
int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags,
struct netlink_ext_ack *extack)
{
struct net_bridge *br = (struct net_bridge *)netdev_priv(dev);
struct nlattr *tb[IFLA_BRPORT_MAX + 1];
struct net_bridge_port *p;
struct nlattr *protinfo;
struct nlattr *afspec;
bool changed = false;
int err = 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;