Modify the forwarding path so that IGMPv1/2/MLDv1 Reports are always
flooded by br_multicast_flood, regardless of the check done
by br_multicast_querier_exists.
This patch fixes the problems where after a system boots up, the first
couple of Reports are not handled properly in that:
1) the Report from the Host is being flooded (via br_flood) to all
bridge ports, and
2) if the mrouter port's mcast_flood is disabled, the Reports received
from other hosts will not be forwarded to the Querier.
Signed-off-by: Joseph Huang <Joseph.Huang@xxxxxxxxxx>
---
net/bridge/br_device.c | 5 +++--
net/bridge/br_input.c | 5 +++--
net/bridge/br_multicast.c | 3 +++
net/bridge/br_private.h | 3 +++
4 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index e8b626cc6bfd..ff75ba242f38 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -88,8 +88,9 @@ 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)) &&
- br_multicast_querier_exists(br, eth_hdr(skb), mdst))
+ if (((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
+ br_multicast_querier_exists(br, eth_hdr(skb), mdst)) ||
+ BR_INPUT_SKB_CB_FORCE_MC_FLOOD(skb))
br_multicast_flood(mdst, skb, false, true);
else
br_flood(br, skb, BR_PKT_MULTICAST, false, true);
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 8875e953ac53..572d7f20477f 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -129,8 +129,9 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
switch (pkt_type) {
case BR_PKT_MULTICAST:
mdst = br_mdb_get(br, skb, vid);
- if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
- br_multicast_querier_exists(br, eth_hdr(skb), mdst)) {
+ if (((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
+ br_multicast_querier_exists(br, eth_hdr(skb), mdst)) ||
+ BR_INPUT_SKB_CB_FORCE_MC_FLOOD(skb)) {
if ((mdst && mdst->host_joined) ||
br_multicast_is_router(br)) {
local_rcv = true;
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index b7d9c491abe0..dfdbe19f3e93 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -3231,6 +3231,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMPV2_HOST_MEMBERSHIP_REPORT:
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ BR_INPUT_SKB_CB(skb)->force_mc_flood = 1;
err = br_ip4_multicast_add_group(br, port, ih->group, vid, src,
true);
break;
@@ -3294,6 +3295,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
case ICMPV6_MGM_REPORT:
src = eth_hdr(skb)->h_source;
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ BR_INPUT_SKB_CB(skb)->force_mc_flood = 1;
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
src, true);
break;
@@ -3325,6 +3327,7 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
BR_INPUT_SKB_CB(skb)->igmp = 0;
BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
BR_INPUT_SKB_CB(skb)->force_flood = 0;
+ BR_INPUT_SKB_CB(skb)->force_mc_flood = 0;
if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
return 0;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 59af599d48eb..6d4f20d7f482 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -492,6 +492,7 @@ struct br_input_skb_cb {
u8 igmp;
u8 mrouters_only:1;
u8 force_flood:1;
+ u8 force_mc_flood:1;
#endif
u8 proxyarp_replied:1;
u8 src_port_isolated:1;
@@ -512,9 +513,11 @@ struct br_input_skb_cb {
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
# define BR_INPUT_SKB_CB_FORCE_FLOOD(__skb) (BR_INPUT_SKB_CB(__skb)->force_flood)
+# define BR_INPUT_SKB_CB_FORCE_MC_FLOOD(__skb) (BR_INPUT_SKB_CB(__skb)->force_mc_flood)
#else
# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
# define BR_INPUT_SKB_CB_FORCE_FLOOD(__skb) (0)
+# define BR_INPUT_SKB_CB_FORCE_MC_FLOOD(__skb) (0)
#endif
#define br_printk(level, br, format, args...) \
--
2.17.1
