Commit 1080ab95 authored by Nikolay Aleksandrov's avatar Nikolay Aleksandrov Committed by David S. Miller
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net: bridge: add support for IGMP/MLD stats and export them via netlink



This patch adds stats support for the currently used IGMP/MLD types by the
bridge. The stats are per-port (plus one stat per-bridge) and per-direction
(RX/TX). The stats are exported via netlink via the new linkxstats API
(RTM_GETSTATS). In order to minimize the performance impact, a new option
is used to enable/disable the stats - multicast_stats_enabled, similar to
the recent vlan stats. Also in order to avoid multiple IGMP/MLD type
lookups and checks, we make use of the current "igmp" member of the bridge
private skb->cb region to record the type on Rx (both host-generated and
external packets pass by multicast_rcv()). We can do that since the igmp
member was used as a boolean and all the valid IGMP/MLD types are positive
values. The normal bridge fast-path is not affected at all, the only
affected paths are the flooding ones and since we make use of the IGMP/MLD
type, we can quickly determine if the packet should be counted using
cache-hot data (cb's igmp member). We add counters for:
* IGMP Queries
* IGMP Leaves
* IGMP v1/v2/v3 reports

* MLD Queries
* MLD Leaves
* MLD v1/v2 reports

These are invaluable when monitoring or debugging complex multicast setups
with bridges.
Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 80e73cc5
......@@ -247,8 +247,34 @@ enum {
enum {
BRIDGE_XSTATS_UNSPEC,
BRIDGE_XSTATS_VLAN,
BRIDGE_XSTATS_MCAST,
BRIDGE_XSTATS_PAD,
__BRIDGE_XSTATS_MAX
};
#define BRIDGE_XSTATS_MAX (__BRIDGE_XSTATS_MAX - 1)
enum {
BR_MCAST_DIR_RX,
BR_MCAST_DIR_TX,
BR_MCAST_DIR_SIZE
};
/* IGMP/MLD statistics */
struct br_mcast_stats {
__u64 igmp_queries[BR_MCAST_DIR_SIZE];
__u64 igmp_leaves[BR_MCAST_DIR_SIZE];
__u64 igmp_v1reports[BR_MCAST_DIR_SIZE];
__u64 igmp_v2reports[BR_MCAST_DIR_SIZE];
__u64 igmp_v3reports[BR_MCAST_DIR_SIZE];
__u64 igmp_parse_errors;
__u64 mld_queries[BR_MCAST_DIR_SIZE];
__u64 mld_leaves[BR_MCAST_DIR_SIZE];
__u64 mld_v1reports[BR_MCAST_DIR_SIZE];
__u64 mld_v2reports[BR_MCAST_DIR_SIZE];
__u64 mld_parse_errors;
__u64 mcast_bytes[BR_MCAST_DIR_SIZE];
__u64 mcast_packets[BR_MCAST_DIR_SIZE];
};
#endif /* _UAPI_LINUX_IF_BRIDGE_H */
......@@ -273,6 +273,7 @@ enum {
IFLA_BR_VLAN_DEFAULT_PVID,
IFLA_BR_PAD,
IFLA_BR_VLAN_STATS_ENABLED,
IFLA_BR_MCAST_STATS_ENABLED,
__IFLA_BR_MAX,
};
......
......@@ -104,8 +104,16 @@ static int br_dev_init(struct net_device *dev)
return -ENOMEM;
err = br_vlan_init(br);
if (err)
if (err) {
free_percpu(br->stats);
return err;
}
err = br_multicast_init_stats(br);
if (err) {
free_percpu(br->stats);
br_vlan_flush(br);
}
br_set_lockdep_class(dev);
return err;
......
......@@ -198,8 +198,10 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
struct sk_buff *skb),
bool unicast)
{
struct net_bridge_port *p;
u8 igmp_type = br_multicast_igmp_type(skb);
__be16 proto = skb->protocol;
struct net_bridge_port *prev;
struct net_bridge_port *p;
prev = NULL;
......@@ -218,6 +220,9 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
prev = maybe_deliver(prev, p, skb, __packet_hook);
if (IS_ERR(prev))
goto out;
if (prev == p)
br_multicast_count(p->br, p, proto, igmp_type,
BR_MCAST_DIR_TX);
}
if (!prev)
......@@ -257,9 +262,12 @@ static void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
struct sk_buff *skb))
{
struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
u8 igmp_type = br_multicast_igmp_type(skb);
struct net_bridge *br = netdev_priv(dev);
struct net_bridge_port *prev = NULL;
struct net_bridge_port_group *p;
__be16 proto = skb->protocol;
struct hlist_node *rp;
rp = rcu_dereference(hlist_first_rcu(&br->router_list));
......@@ -277,6 +285,9 @@ static void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
prev = maybe_deliver(prev, port, skb, __packet_hook);
if (IS_ERR(prev))
goto out;
if (prev == port)
br_multicast_count(port->br, port, proto, igmp_type,
BR_MCAST_DIR_TX);
if ((unsigned long)lport >= (unsigned long)port)
p = rcu_dereference(p->next);
......
......@@ -345,8 +345,8 @@ static int find_portno(struct net_bridge *br)
static struct net_bridge_port *new_nbp(struct net_bridge *br,
struct net_device *dev)
{
int index;
struct net_bridge_port *p;
int index, err;
index = find_portno(br);
if (index < 0)
......@@ -366,7 +366,12 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
br_init_port(p);
br_set_state(p, BR_STATE_DISABLED);
br_stp_port_timer_init(p);
br_multicast_add_port(p);
err = br_multicast_add_port(p);
if (err) {
dev_put(dev);
kfree(p);
p = ERR_PTR(err);
}
return p;
}
......
......@@ -60,6 +60,9 @@ static int br_pass_frame_up(struct sk_buff *skb)
skb = br_handle_vlan(br, vg, skb);
if (!skb)
return NET_RX_DROP;
/* update the multicast stats if the packet is IGMP/MLD */
br_multicast_count(br, NULL, skb->protocol, br_multicast_igmp_type(skb),
BR_MCAST_DIR_TX);
return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN,
dev_net(indev), NULL, skb, indev, NULL,
......
......@@ -361,7 +361,8 @@ out:
}
static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
__be32 group)
__be32 group,
u8 *igmp_type)
{
struct sk_buff *skb;
struct igmphdr *ih;
......@@ -411,6 +412,7 @@ static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
skb_set_transport_header(skb, skb->len);
ih = igmp_hdr(skb);
*igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
ih->code = (group ? br->multicast_last_member_interval :
br->multicast_query_response_interval) /
......@@ -428,7 +430,8 @@ out:
#if IS_ENABLED(CONFIG_IPV6)
static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
const struct in6_addr *group)
const struct in6_addr *grp,
u8 *igmp_type)
{
struct sk_buff *skb;
struct ipv6hdr *ip6h;
......@@ -487,16 +490,17 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
skb_set_transport_header(skb, skb->len);
mldq = (struct mld_msg *) icmp6_hdr(skb);
interval = ipv6_addr_any(group) ?
interval = ipv6_addr_any(grp) ?
br->multicast_query_response_interval :
br->multicast_last_member_interval;
*igmp_type = ICMPV6_MGM_QUERY;
mldq->mld_type = ICMPV6_MGM_QUERY;
mldq->mld_code = 0;
mldq->mld_cksum = 0;
mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
mldq->mld_reserved = 0;
mldq->mld_mca = *group;
mldq->mld_mca = *grp;
/* checksum */
mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
......@@ -513,14 +517,16 @@ out:
#endif
static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
struct br_ip *addr)
struct br_ip *addr,
u8 *igmp_type)
{
switch (addr->proto) {
case htons(ETH_P_IP):
return br_ip4_multicast_alloc_query(br, addr->u.ip4);
return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
igmp_type);
#endif
}
return NULL;
......@@ -829,18 +835,23 @@ static void __br_multicast_send_query(struct net_bridge *br,
struct br_ip *ip)
{
struct sk_buff *skb;
u8 igmp_type;
skb = br_multicast_alloc_query(br, ip);
skb = br_multicast_alloc_query(br, ip, &igmp_type);
if (!skb)
return;
if (port) {
skb->dev = port->dev;
br_multicast_count(br, port, skb->protocol, igmp_type,
BR_MCAST_DIR_TX);
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
dev_net(port->dev), NULL, skb, NULL, skb->dev,
br_dev_queue_push_xmit);
} else {
br_multicast_select_own_querier(br, ip, skb);
br_multicast_count(br, port, skb->protocol, igmp_type,
BR_MCAST_DIR_RX);
netif_rx(skb);
}
}
......@@ -918,7 +929,7 @@ static void br_ip6_multicast_port_query_expired(unsigned long data)
}
#endif
void br_multicast_add_port(struct net_bridge_port *port)
int br_multicast_add_port(struct net_bridge_port *port)
{
port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
......@@ -930,6 +941,11 @@ void br_multicast_add_port(struct net_bridge_port *port)
setup_timer(&port->ip6_own_query.timer,
br_ip6_multicast_port_query_expired, (unsigned long)port);
#endif
port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
if (!port->mcast_stats)
return -ENOMEM;
return 0;
}
void br_multicast_del_port(struct net_bridge_port *port)
......@@ -944,6 +960,7 @@ void br_multicast_del_port(struct net_bridge_port *port)
br_multicast_del_pg(br, pg);
spin_unlock_bh(&br->multicast_lock);
del_timer_sync(&port->multicast_router_timer);
free_percpu(port->mcast_stats);
}
static void br_multicast_enable(struct bridge_mcast_own_query *query)
......@@ -1583,6 +1600,39 @@ static void br_ip6_multicast_leave_group(struct net_bridge *br,
}
#endif
static void br_multicast_err_count(const struct net_bridge *br,
const struct net_bridge_port *p,
__be16 proto)
{
struct bridge_mcast_stats __percpu *stats;
struct bridge_mcast_stats *pstats;
if (!br->multicast_stats_enabled)
return;
if (p)
stats = p->mcast_stats;
else
stats = br->mcast_stats;
if (WARN_ON(!stats))
return;
pstats = this_cpu_ptr(stats);
u64_stats_update_begin(&pstats->syncp);
switch (proto) {
case htons(ETH_P_IP):
pstats->mstats.igmp_parse_errors++;
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
pstats->mstats.mld_parse_errors++;
break;
#endif
}
u64_stats_update_end(&pstats->syncp);
}
static int br_multicast_ipv4_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb,
......@@ -1599,11 +1649,12 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
return 0;
} else if (err < 0) {
br_multicast_err_count(br, port, skb->protocol);
return err;
}
BR_INPUT_SKB_CB(skb)->igmp = 1;
ih = igmp_hdr(skb);
BR_INPUT_SKB_CB(skb)->igmp = ih->type;
switch (ih->type) {
case IGMP_HOST_MEMBERSHIP_REPORT:
......@@ -1625,6 +1676,9 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
if (skb_trimmed && skb_trimmed != skb)
kfree_skb(skb_trimmed);
br_multicast_count(br, port, skb->protocol, BR_INPUT_SKB_CB(skb)->igmp,
BR_MCAST_DIR_RX);
return err;
}
......@@ -1645,11 +1699,12 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
return 0;
} else if (err < 0) {
br_multicast_err_count(br, port, skb->protocol);
return err;
}
BR_INPUT_SKB_CB(skb)->igmp = 1;
mld = (struct mld_msg *)skb_transport_header(skb);
BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
switch (mld->mld_type) {
case ICMPV6_MGM_REPORT:
......@@ -1670,6 +1725,9 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
if (skb_trimmed && skb_trimmed != skb)
kfree_skb(skb_trimmed);
br_multicast_count(br, port, skb->protocol, BR_INPUT_SKB_CB(skb)->igmp,
BR_MCAST_DIR_RX);
return err;
}
#endif
......@@ -1677,6 +1735,8 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
struct sk_buff *skb, u16 vid)
{
int ret = 0;
BR_INPUT_SKB_CB(skb)->igmp = 0;
BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
......@@ -1685,14 +1745,16 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
switch (skb->protocol) {
case htons(ETH_P_IP):
return br_multicast_ipv4_rcv(br, port, skb, vid);
ret = br_multicast_ipv4_rcv(br, port, skb, vid);
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
return br_multicast_ipv6_rcv(br, port, skb, vid);
ret = br_multicast_ipv6_rcv(br, port, skb, vid);
break;
#endif
}
return 0;
return ret;
}
static void br_multicast_query_expired(struct net_bridge *br,
......@@ -1831,6 +1893,8 @@ void br_multicast_dev_del(struct net_bridge *br)
out:
spin_unlock_bh(&br->multicast_lock);
free_percpu(br->mcast_stats);
}
int br_multicast_set_router(struct net_bridge *br, unsigned long val)
......@@ -2185,3 +2249,128 @@ unlock:
return ret;
}
EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
__be16 proto, u8 type, u8 dir)
{
struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
u64_stats_update_begin(&pstats->syncp);
switch (proto) {
case htons(ETH_P_IP):
switch (type) {
case IGMP_HOST_MEMBERSHIP_REPORT:
pstats->mstats.igmp_v1reports[dir]++;
break;
case IGMPV2_HOST_MEMBERSHIP_REPORT:
pstats->mstats.igmp_v2reports[dir]++;
break;
case IGMPV3_HOST_MEMBERSHIP_REPORT:
pstats->mstats.igmp_v3reports[dir]++;
break;
case IGMP_HOST_MEMBERSHIP_QUERY:
pstats->mstats.igmp_queries[dir]++;
break;
case IGMP_HOST_LEAVE_MESSAGE:
pstats->mstats.igmp_leaves[dir]++;
break;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
switch (type) {
case ICMPV6_MGM_REPORT:
pstats->mstats.mld_v1reports[dir]++;
break;
case ICMPV6_MLD2_REPORT:
pstats->mstats.mld_v2reports[dir]++;
break;
case ICMPV6_MGM_QUERY:
pstats->mstats.mld_queries[dir]++;
break;
case ICMPV6_MGM_REDUCTION:
pstats->mstats.mld_leaves[dir]++;
break;
}
break;
#endif /* CONFIG_IPV6 */
}
u64_stats_update_end(&pstats->syncp);
}
void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
__be16 proto, u8 type, u8 dir)
{
struct bridge_mcast_stats __percpu *stats;
/* if multicast_disabled is true then igmp type can't be set */
if (!type || !br->multicast_stats_enabled)
return;
if (p)
stats = p->mcast_stats;
else
stats = br->mcast_stats;
if (WARN_ON(!stats))
return;
br_mcast_stats_add(stats, proto, type, dir);
}
int br_multicast_init_stats(struct net_bridge *br)
{
br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
if (!br->mcast_stats)
return -ENOMEM;
return 0;
}
static void mcast_stats_add_dir(u64 *dst, u64 *src)
{
dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
}
void br_multicast_get_stats(const struct net_bridge *br,
const struct net_bridge_port *p,
struct br_mcast_stats *dest)
{
struct bridge_mcast_stats __percpu *stats;
struct br_mcast_stats tdst;
int i;
memset(dest, 0, sizeof(*dest));
if (p)
stats = p->mcast_stats;
else
stats = br->mcast_stats;
if (WARN_ON(!stats))
return;
memset(&tdst, 0, sizeof(tdst));
for_each_possible_cpu(i) {
struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
struct br_mcast_stats temp;
unsigned int start;
do {
start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
mcast_stats_add_dir(tdst.igmp_queries, temp.igmp_queries);
mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
tdst.igmp_parse_errors += temp.igmp_parse_errors;
mcast_stats_add_dir(tdst.mld_queries, temp.mld_queries);
mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
tdst.mld_parse_errors += temp.mld_parse_errors;
}
memcpy(dest, &tdst, sizeof(*dest));
}
......@@ -851,6 +851,7 @@ static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
[IFLA_BR_NF_CALL_ARPTABLES] = { .type = NLA_U8 },
[IFLA_BR_VLAN_DEFAULT_PVID] = { .type = NLA_U16 },
[IFLA_BR_VLAN_STATS_ENABLED] = { .type = NLA_U8 },
[IFLA_BR_MCAST_STATS_ENABLED] = { .type = NLA_U8 },
};
static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
......@@ -1055,6 +1056,13 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
br->multicast_startup_query_interval = clock_t_to_jiffies(val);
}
if (data[IFLA_BR_MCAST_STATS_ENABLED]) {
__u8 mcast_stats;
mcast_stats = nla_get_u8(data[IFLA_BR_MCAST_STATS_ENABLED]);
br->multicast_stats_enabled = !!mcast_stats;
}
#endif
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (data[IFLA_BR_NF_CALL_IPTABLES]) {
......@@ -1110,6 +1118,7 @@ static size_t br_get_size(const struct net_device *brdev)
nla_total_size(sizeof(u8)) + /* IFLA_BR_MCAST_SNOOPING */
nla_total_size(sizeof(u8)) + /* IFLA_BR_MCAST_QUERY_USE_IFADDR */
nla_total_size(sizeof(u8)) + /* IFLA_BR_MCAST_QUERIER */
nla_total_size(sizeof(u8)) + /* IFLA_BR_MCAST_STATS_ENABLED */
nla_total_size(sizeof(u32)) + /* IFLA_BR_MCAST_HASH_ELASTICITY */
nla_total_size(sizeof(u32)) + /* IFLA_BR_MCAST_HASH_MAX */
nla_total_size(sizeof(u32)) + /* IFLA_BR_MCAST_LAST_MEMBER_CNT */
......@@ -1187,6 +1196,8 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
nla_put_u8(skb, IFLA_BR_MCAST_QUERY_USE_IFADDR,
br->multicast_query_use_ifaddr) ||
nla_put_u8(skb, IFLA_BR_MCAST_QUERIER, br->multicast_querier) ||
nla_put_u8(skb, IFLA_BR_MCAST_STATS_ENABLED,
br->multicast_stats_enabled) ||
nla_put_u32(skb, IFLA_BR_MCAST_HASH_ELASTICITY,
br->hash_elasticity) ||
nla_put_u32(skb, IFLA_BR_MCAST_HASH_MAX, br->hash_max) ||
......@@ -1242,21 +1253,21 @@ static size_t bridge_get_linkxstats_size(const struct net_device *dev)
int numvls = 0;
vg = br_vlan_group(br);
if (!vg)
return 0;
/* we need to count all, even placeholder entries */
list_for_each_entry(v, &vg->vlan_list, vlist)
numvls++;
if (vg) {
/* we need to count all, even placeholder entries */
list_for_each_entry(v, &vg->vlan_list, vlist)
numvls++;
}
/* account for the vlans and the link xstats type nest attribute */
return numvls * nla_total_size(sizeof(struct bridge_vlan_xstats)) +
nla_total_size(sizeof(struct br_mcast_stats)) +
nla_total_size(0);
}
static size_t brport_get_linkxstats_size(const struct net_device *dev)
{
return nla_total_size(0);
return nla_total_size(sizeof(struct br_mcast_stats)) +
nla_total_size(0);
}
static size_t br_get_linkxstats_size(const struct net_device *dev, int attr)
......@@ -1280,37 +1291,50 @@ static int bridge_fill_linkxstats(struct sk_buff *skb,
int *prividx)
{
struct net_bridge *br = netdev_priv(dev);
struct nlattr *nla __maybe_unused;
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
struct nlattr *nest;
int vl_idx = 0;
vg = br_vlan_group(br);
if (!vg)
goto out;
nest = nla_nest_start(skb, LINK_XSTATS_TYPE_BRIDGE);
if (!nest)
return -EMSGSIZE;
list_for_each_entry(v, &vg->vlan_list, vlist) {
struct bridge_vlan_xstats vxi;
struct br_vlan_stats stats;
if (++vl_idx < *prividx)
continue;
memset(&vxi, 0, sizeof(vxi));
vxi.vid = v->vid;
br_vlan_get_stats(v, &stats);
vxi.rx_bytes = stats.rx_bytes;
vxi.rx_packets = stats.rx_packets;
vxi.tx_bytes = stats.tx_bytes;
vxi.tx_packets = stats.tx_packets;
if (nla_put(skb, BRIDGE_XSTATS_VLAN, sizeof(vxi), &vxi))
vg = br_vlan_group(br);
if (vg) {
list_for_each_entry(v, &vg->vlan_list, vlist) {
struct bridge_vlan_xstats vxi;
struct br_vlan_stats stats;
if (++vl_idx < *prividx)
continue;<