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    Subject[PATCH] bridge: disable snooping if there is no querier
    Date
    If there is no querier on a link then we won't get periodic reports and
    therefore won't be able to learn about multicast listeners behind ports,
    potentially leading to lost multicast packets, especially for multicast
    listeners that joined before the creation of the bridge.

    These lost multicast packets can appear since c5c23260594
    ("bridge: Add multicast_querier toggle and disable queries by default")
    in particular.

    With this patch we are flooding multicast packets if our querier is
    disabled and if we didn't detect any other querier.

    A grace period of the Maximum Response Delay of the querier is added to
    give multicast responses enough time to arrive and to be learned from
    before disabling the flooding behaviour again.

    Signed-off-by: Linus Lüssing <linus.luessing@web.de>
    ---
    net/bridge/br_device.c | 3 ++-
    net/bridge/br_input.c | 3 ++-
    net/bridge/br_multicast.c | 41 ++++++++++++++++++++++++++++++++---------
    net/bridge/br_private.h | 11 +++++++++++
    4 files changed, 47 insertions(+), 11 deletions(-)

    diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
    index 2ef6678..69363bd 100644
    --- a/net/bridge/br_device.c
    +++ b/net/bridge/br_device.c
    @@ -70,7 +70,8 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
    }

    mdst = br_mdb_get(br, skb, vid);
    - if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
    + if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
    + br_multicast_querier_exists(br))
    br_multicast_deliver(mdst, skb);
    else
    br_flood_deliver(br, skb, false);
    diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
    index 1b8b8b8..8c561c0 100644
    --- a/net/bridge/br_input.c
    +++ b/net/bridge/br_input.c
    @@ -101,7 +101,8 @@ int br_handle_frame_finish(struct sk_buff *skb)
    unicast = false;
    } else if (is_multicast_ether_addr(dest)) {
    mdst = br_mdb_get(br, skb, vid);
    - if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) {
    + if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
    + br_multicast_querier_exists(br)) {
    if ((mdst && mdst->mglist) ||
    br_multicast_is_router(br))
    skb2 = skb;
    diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
    index 69af490..5b5b9c0 100644
    --- a/net/bridge/br_multicast.c
    +++ b/net/bridge/br_multicast.c
    @@ -1011,6 +1011,17 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
    }
    #endif

    +static void br_multicast_update_querier_timer(struct net_bridge *br,
    + unsigned long max_delay)
    +{
    + if (!timer_pending(&br->multicast_querier_timer))
    + atomic64_set(&br->multicast_querier_delay_time,
    + jiffies + max_delay);
    +
    + mod_timer(&br->multicast_querier_timer,
    + jiffies + br->multicast_querier_interval);
    +}
    +
    /*
    * Add port to router_list
    * list is maintained ordered by pointer value
    @@ -1061,11 +1072,11 @@ timer:

    static void br_multicast_query_received(struct net_bridge *br,
    struct net_bridge_port *port,
    - int saddr)
    + int saddr,
    + unsigned long max_delay)
    {
    if (saddr)
    - mod_timer(&br->multicast_querier_timer,
    - jiffies + br->multicast_querier_interval);
    + br_multicast_update_querier_timer(br, max_delay);
    else if (timer_pending(&br->multicast_querier_timer))
    return;

    @@ -1093,8 +1104,6 @@ static int br_ip4_multicast_query(struct net_bridge *br,
    (port && port->state == BR_STATE_DISABLED))
    goto out;

    - br_multicast_query_received(br, port, !!iph->saddr);
    -
    group = ih->group;

    if (skb->len == sizeof(*ih)) {
    @@ -1118,6 +1127,8 @@ static int br_ip4_multicast_query(struct net_bridge *br,
    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
    }

    + br_multicast_query_received(br, port, !!iph->saddr, max_delay);
    +
    if (!group)
    goto out;

    @@ -1174,8 +1185,6 @@ static int br_ip6_multicast_query(struct net_bridge *br,
    (port && port->state == BR_STATE_DISABLED))
    goto out;

    - br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
    -
    if (skb->len == sizeof(*mld)) {
    if (!pskb_may_pull(skb, sizeof(*mld))) {
    err = -EINVAL;
    @@ -1196,6 +1205,9 @@ static int br_ip6_multicast_query(struct net_bridge *br,
    max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1;
    }

    + br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr),
    + max_delay);
    +
    if (!group)
    goto out;

    @@ -1642,6 +1654,8 @@ void br_multicast_init(struct net_bridge *br)
    br->multicast_querier_interval = 255 * HZ;
    br->multicast_membership_interval = 260 * HZ;

    + atomic64_set(&br->multicast_querier_delay_time, 0);
    +
    spin_lock_init(&br->multicast_lock);
    setup_timer(&br->multicast_router_timer,
    br_multicast_local_router_expired, 0);
    @@ -1830,6 +1844,8 @@ unlock:

    int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
    {
    + unsigned long max_delay;
    +
    val = !!val;

    spin_lock_bh(&br->multicast_lock);
    @@ -1837,8 +1853,15 @@ int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
    goto unlock;

    br->multicast_querier = val;
    - if (val)
    - br_multicast_start_querier(br);
    + if (!val)
    + goto unlock;
    +
    + max_delay = br->multicast_query_response_interval;
    + if (!timer_pending(&br->multicast_querier_timer))
    + atomic64_set(&br->multicast_querier_delay_time,
    + jiffies + max_delay);
    +
    + br_multicast_start_querier(br);

    unlock:
    spin_unlock_bh(&br->multicast_lock);
    diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
    index 3be89b3..bbf5173 100644
    --- a/net/bridge/br_private.h
    +++ b/net/bridge/br_private.h
    @@ -275,6 +275,7 @@ struct net_bridge
    struct timer_list multicast_router_timer;
    struct timer_list multicast_querier_timer;
    struct timer_list multicast_query_timer;
    + atomic64_t multicast_querier_delay_time;
    #endif

    struct timer_list hello_timer;
    @@ -501,6 +502,16 @@ static inline bool br_multicast_is_router(struct net_bridge *br)
    (br->multicast_router == 1 &&
    timer_pending(&br->multicast_router_timer));
    }
    +
    +static inline bool br_multicast_querier_exists(struct net_bridge *br)
    +{
    + unsigned long delay_time =
    + atomic64_read(&br->multicast_querier_delay_time);
    +
    + return time_is_before_jiffies(delay_time) &&
    + (br->multicast_querier ||
    + timer_pending(&br->multicast_querier_timer));
    +}
    #else
    static inline int br_multicast_rcv(struct net_bridge *br,
    struct net_bridge_port *port,
    --
    1.7.10.4
    --
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