From: Linus Lüssing <linus.luessing@c0d3.blue>
Date: Sat, 1 Jan 2022 10:09:13 +0100
Subject: kernel: bridge: Implement MLD Querier wake-up calls / Android bug workaround

Implement a configurable MLD Querier wake-up calls "feature" which
works around a widely spread Android bug in connection with IGMP/MLD
snooping.

Currently there are mobile devices (e.g. Android) which are not able
to receive and respond to MLD Queries reliably because the Wifi driver
filters a lot of ICMPv6 when the device is asleep - including
MLD. This in turn breaks IPv6 communication when MLD Snooping is
enabled. However there is one ICMPv6 type which is allowed to pass and
which can be used to wake up the mobile device: ICMPv6 Echo Requests.

If this bridge is the selected MLD Querier then setting
"multicast_wakeupcall" to a number n greater than 0 will send n
ICMPv6 Echo Requests to each host behind this port to wake
them up with each MLD Query. Upon receiving a matching ICMPv6 Echo
Reply an MLD Query with a unicast ethernet destination will be sent
to the specific host(s).

Link: https://issuetracker.google.com/issues/149630944
Link: https://github.com/freifunk-gluon/gluon/issues/1832

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

diff --git a/package/network/config/netifd/patches/0001-bridge-Add-multicast_wakeupcall-option.patch b/package/network/config/netifd/patches/0001-bridge-Add-multicast_wakeupcall-option.patch
new file mode 100644
index 0000000000000000000000000000000000000000..077a563b6066cd1d3aee4b1e82328e8cc5e042ea
--- /dev/null
+++ b/package/network/config/netifd/patches/0001-bridge-Add-multicast_wakeupcall-option.patch
@@ -0,0 +1,142 @@
+From d23a49e6542dc068b12fbc7b6a4520f9fb3626f9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@c0d3.blue>
+Date: Sun, 5 Jul 2020 23:33:51 +0200
+Subject: [PATCH] bridge: Add multicast_wakeupcall option
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This makes the new per bridge port multicast_wakeupcall feature
+for the Linux bridge configurable for wireless interfaces and enables it
+by default for an AP interface.
+
+The MLD Querier wake-up calls "feature" works around a widely spread Android
+bug in connection with IGMP/MLD snooping.
+
+Currently there are mobile devices (e.g. Android) which are not able
+to receive and respond to MLD Queries reliably because the Wifi driver
+filters a lot of ICMPv6 when the device is asleep - including
+MLD. This in turn breaks IPv6 communication when MLD Snooping is
+enabled. However there is one ICMPv6 type which is allowed to pass and
+which can be used to wake up the mobile device: ICMPv6 Echo Requests.
+
+If this bridge is the selected MLD Querier then setting
+"multicast_wakeupcall" to a number n greater than 0 will send n
+ICMPv6 Echo Requests to each host behind this port to wake
+them up with each MLD Query. Upon receiving a matching ICMPv6 Echo
+Reply an MLD Query with a unicast ethernet destination will be sent
+to the specific host(s).
+
+Link: https://issuetracker.google.com/issues/149630944
+Link: https://github.com/freifunk-gluon/gluon/issues/1832
+
+Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
+---
+ device.c       |  9 +++++++++
+ device.h       |  3 +++
+ system-linux.c | 13 +++++++++++++
+ 3 files changed, 25 insertions(+)
+
+--- a/device.c
++++ b/device.c
+@@ -49,6 +49,7 @@ static const struct blobmsg_policy dev_a
+ 	[DEV_ATTR_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
+ 	[DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
+ 	[DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
++	[DEV_ATTR_MULTICAST_WAKEUPCALL] = { .name = "multicast_wakeupcall", .type = BLOBMSG_TYPE_INT32 },
+ 	[DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
+ 	[DEV_ATTR_MULTICAST_FAST_LEAVE] = { .name = "multicast_fast_leave", . type = BLOBMSG_TYPE_BOOL },
+ 	[DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
+@@ -275,6 +276,7 @@ device_merge_settings(struct device *dev
+ 	n->multicast = s->flags & DEV_OPT_MULTICAST ?
+ 		s->multicast : os->multicast;
+ 	n->multicast_to_unicast = s->multicast_to_unicast;
++	n->multicast_wakeupcall = s->multicast_wakeupcall;
+ 	n->multicast_router = s->multicast_router;
+ 	n->multicast_fast_leave = s->multicast_fast_leave;
+ 	n->learning = s->learning;
+@@ -449,6 +451,11 @@ device_init_settings(struct device *dev,
+ 		s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
+ 	}
+ 
++	if ((cur = tb[DEV_ATTR_MULTICAST_WAKEUPCALL])) {
++		s->multicast_wakeupcall = blobmsg_get_u32(cur);
++		s->flags |= DEV_OPT_MULTICAST_WAKEUPCALL;
++	}
++
+ 	if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
+ 		s->multicast_router = blobmsg_get_u32(cur);
+ 		if (s->multicast_router <= 2)
+@@ -1372,6 +1379,8 @@ device_dump_status(struct blob_buf *b, s
+ 			blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
+ 		if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
+ 			blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
++		if (st.flags & DEV_OPT_MULTICAST_WAKEUPCALL)
++			blobmsg_add_u32(b, "multicast_wakeupcall", st.multicast_wakeupcall);
+ 		if (st.flags & DEV_OPT_MULTICAST_ROUTER)
+ 			blobmsg_add_u32(b, "multicast_router", st.multicast_router);
+ 		if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
+--- a/device.h
++++ b/device.h
+@@ -44,6 +44,7 @@ enum {
+ 	DEV_ATTR_NEIGHREACHABLETIME,
+ 	DEV_ATTR_DADTRANSMITS,
+ 	DEV_ATTR_MULTICAST_TO_UNICAST,
++	DEV_ATTR_MULTICAST_WAKEUPCALL,
+ 	DEV_ATTR_MULTICAST_ROUTER,
+ 	DEV_ATTR_MULTICAST_FAST_LEAVE,
+ 	DEV_ATTR_MULTICAST,
+@@ -144,6 +145,7 @@ enum {
+ 	DEV_OPT_GRO			= (1ULL << 37),
+ 	DEV_OPT_MASTER			= (1ULL << 38),
+ 	DEV_OPT_EEE			= (1ULL << 39),
++	DEV_OPT_MULTICAST_WAKEUPCALL	= (1ULL << 63),
+ };
+ 
+ /* events broadcasted to all users of a device */
+@@ -205,6 +207,7 @@ struct device_settings {
+ 	int neigh4locktime;
+ 	unsigned int dadtransmits;
+ 	bool multicast_to_unicast;
++	unsigned int multicast_wakeupcall;
+ 	unsigned int multicast_router;
+ 	bool multicast_fast_leave;
+ 	bool multicast;
+--- a/system-linux.c
++++ b/system-linux.c
+@@ -536,6 +536,11 @@ static void system_bridge_set_multicast_
+ 	system_set_dev_sysfs("brport/multicast_to_unicast", dev->ifname, val);
+ }
+ 
++static void system_bridge_set_multicast_wakeupcall(struct device *dev, const char *val)
++{
++	system_set_dev_sysfs("brport/multicast_wakeupcall", dev->ifname, val);
++}
++
+ static void system_bridge_set_multicast_fast_leave(struct device *dev, const char *val)
+ {
+ 	system_set_dev_sysfs("brport/multicast_fast_leave", dev->ifname, val);
+@@ -923,8 +928,10 @@ static char *system_get_bridge(const cha
+ static void
+ system_bridge_set_wireless(struct device *bridge, struct device *dev)
+ {
++	unsigned int mcast_wakeupcall = dev->wireless_ap ? 2 : 0;
+ 	bool mcast_to_ucast = dev->wireless_ap;
+ 	bool hairpin;
++	char buf[64];
+ 
+ 	if (dev->settings.flags & DEV_OPT_MULTICAST_TO_UNICAST)
+ 		mcast_to_ucast = dev->settings.multicast_to_unicast;
+@@ -939,6 +946,12 @@ system_bridge_set_wireless(struct device
+ 	system_bridge_set_multicast_to_unicast(dev, mcast_to_ucast ? "1" : "0");
+ 	system_bridge_set_hairpin_mode(dev, hairpin ? "1" : "0");
+ 	system_bridge_set_proxyarp_wifi(dev, dev->wireless_proxyarp ? "1" : "0");
++
++	if (bridge->settings.flags & DEV_OPT_MULTICAST_WAKEUPCALL)
++		mcast_wakeupcall = dev->settings.multicast_wakeupcall;
++
++	snprintf(buf, sizeof(buf), "%u", mcast_wakeupcall);
++	system_bridge_set_multicast_wakeupcall(dev, buf);
+ }
+ 
+ int system_bridge_addif(struct device *bridge, struct device *dev)
diff --git a/target/linux/generic/config-6.6 b/target/linux/generic/config-6.6
index 105dc0d344fa82c85b09482e051f35a282a60b08..032dd15bbb2b8603799032647f7a47625751836f 100644
--- a/target/linux/generic/config-6.6
+++ b/target/linux/generic/config-6.6
@@ -716,6 +716,7 @@ CONFIG_BRIDGE=y
 # CONFIG_BRIDGE_EBT_T_NAT is not set
 # CONFIG_BRIDGE_EBT_VLAN is not set
 CONFIG_BRIDGE_IGMP_SNOOPING=y
+CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS=y
 # CONFIG_BRIDGE_MRP is not set
 # CONFIG_BRIDGE_NETFILTER is not set
 # CONFIG_BRIDGE_NF_EBTABLES is not set
diff --git a/target/linux/generic/hack-6.6/602-bridge-Implement-MLD-Querier-wake-up-calls-Android-b.patch b/target/linux/generic/hack-6.6/602-bridge-Implement-MLD-Querier-wake-up-calls-Android-b.patch
new file mode 100644
index 0000000000000000000000000000000000000000..5a54131fab24f9cfaa9c51d51b3163bd2ecaf4c3
--- /dev/null
+++ b/target/linux/generic/hack-6.6/602-bridge-Implement-MLD-Querier-wake-up-calls-Android-b.patch
@@ -0,0 +1,690 @@
+From 9734fac17903cc0c67c63361525cc99f793fd6d7 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@c0d3.blue>
+Date: Mon, 29 Jun 2020 19:04:05 +0200
+Subject: [PATCH] bridge: Implement MLD Querier wake-up calls / Android bug
+ workaround
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Implement a configurable MLD Querier wake-up calls "feature" which
+works around a widely spread Android bug in connection with IGMP/MLD
+snooping.
+
+Currently there are mobile devices (e.g. Android) which are not able
+to receive and respond to MLD Queries reliably because the Wifi driver
+filters a lot of ICMPv6 when the device is asleep - including
+MLD. This in turn breaks IPv6 communication when MLD Snooping is
+enabled. However there is one ICMPv6 type which is allowed to pass and
+which can be used to wake up the mobile device: ICMPv6 Echo Requests.
+
+If this bridge is the selected MLD Querier then setting
+"multicast_wakeupcall" to a number n greater than 0 will send n
+ICMPv6 Echo Requests to each host behind this port to wake
+them up with each MLD Query. Upon receiving a matching ICMPv6 Echo
+Reply an MLD Query with a unicast ethernet destination will be sent
+to the specific host(s).
+
+Link: https://issuetracker.google.com/issues/149630944
+Link: https://github.com/freifunk-gluon/gluon/issues/1832
+
+Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
+---
+ include/linux/if_bridge.h    |   1 +
+ include/net/addrconf.h       |   1 +
+ include/uapi/linux/if_link.h |   1 +
+ net/bridge/Kconfig           |  26 ++++
+ net/bridge/br_fdb.c          |  10 ++
+ net/bridge/br_input.c        |   4 +-
+ net/bridge/br_multicast.c    | 291 ++++++++++++++++++++++++++++++++++-
+ net/bridge/br_netlink.c      |  19 +++
+ net/bridge/br_private.h      |  20 +++
+ net/bridge/br_sysfs_if.c     |  18 +++
+ net/core/rtnetlink.c         |   2 +-
+ net/ipv6/mcast_snoop.c       |   3 +-
+ 12 files changed, 386 insertions(+), 10 deletions(-)
+
+diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
+index cff03a1dfd68..70b6f74653d0 100644
+--- a/include/linux/if_bridge.h
++++ b/include/linux/if_bridge.h
+@@ -62,6 +62,7 @@ struct br_ip_list {
+ #define BR_PORT_MAB		BIT(22)
+ #define BR_NEIGH_VLAN_SUPPRESS	BIT(23)
+ #define BR_BPDU_FILTER		BIT(24)
++#define BR_MULTICAST_WAKEUPCALL	BIT(25)
+ 
+ #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
+ 
+diff --git a/include/net/addrconf.h b/include/net/addrconf.h
+index facb7a469efa..817a33d1c055 100644
+--- a/include/net/addrconf.h
++++ b/include/net/addrconf.h
+@@ -243,6 +243,7 @@ void ipv6_mc_unmap(struct inet6_dev *idev);
+ void ipv6_mc_remap(struct inet6_dev *idev);
+ void ipv6_mc_init_dev(struct inet6_dev *idev);
+ void ipv6_mc_destroy_dev(struct inet6_dev *idev);
++int ipv6_mc_check_icmpv6(struct sk_buff *skb);
+ int ipv6_mc_check_mld(struct sk_buff *skb);
+ void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
+ 
+diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
+index b29417908271..88b1c8a19bb4 100644
+--- a/include/uapi/linux/if_link.h
++++ b/include/uapi/linux/if_link.h
+@@ -572,6 +572,7 @@ enum {
+ 	IFLA_BRPORT_NEIGH_VLAN_SUPPRESS,
+ 	IFLA_BRPORT_BACKUP_NHID,
+ 	IFLA_BRPORT_BPDU_FILTER,
++	IFLA_BRPORT_MCAST_WAKEUPCALL,
+ 	__IFLA_BRPORT_MAX
+ };
+ #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
+diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig
+index 3c8ded7d3e84..1a11e22c7d51 100644
+--- a/net/bridge/Kconfig
++++ b/net/bridge/Kconfig
+@@ -48,6 +48,32 @@ config BRIDGE_IGMP_SNOOPING
+ 
+ 	  If unsure, say Y.
+ 
++config BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++	bool "MLD Querier wake-up calls"
++	depends on BRIDGE_IGMP_SNOOPING
++	depends on IPV6
++	help
++	  If you say Y here, then the MLD Snooping Querier will be built
++	  with a per bridge port wake-up call "feature"/workaround.
++
++	  Currently there are mobile devices (e.g. Android) which are not able
++	  to receive and respond to MLD Queries reliably because the Wifi driver
++	  filters a lot of ICMPv6 when the device is asleep - including MLD.
++	  This in turn breaks IPv6 communication when MLD Snooping is enabled.
++	  However there is one ICMPv6 type which is allowed to pass and
++	  which can be used to wake up the mobile device: ICMPv6 Echo Requests.
++
++	  If this bridge is the selected MLD Querier then setting
++	  "multicast_wakeupcall" to a number n greater than 0 will send n
++	  ICMPv6 Echo Requests to each host behind this port to wake them up
++	  with each MLD Query. Upon receiving a matching ICMPv6 Echo Reply
++	  an MLD Query with a unicast ethernet destination will be sent to the
++	  specific host(s).
++
++	  Say N to exclude this support and reduce the binary size.
++
++	  If unsure, say N.
++
+ config BRIDGE_VLAN_FILTERING
+ 	bool "VLAN filtering"
+ 	depends on BRIDGE
+diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
+index a6d8cd9a5807..b70426806d45 100644
+--- a/net/bridge/br_fdb.c
++++ b/net/bridge/br_fdb.c
+@@ -80,6 +80,10 @@ static void fdb_rcu_free(struct rcu_head *head)
+ {
+ 	struct net_bridge_fdb_entry *ent
+ 		= container_of(head, struct net_bridge_fdb_entry, rcu);
++
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++	del_timer_sync(&ent->wakeupcall_timer);
++#endif
+ 	kmem_cache_free(br_fdb_cache, ent);
+ }
+ 
+@@ -400,6 +404,12 @@ static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
+ 	fdb->key.vlan_id = vid;
+ 	fdb->flags = flags;
+ 	fdb->updated = fdb->used = jiffies;
++
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++		timer_setup(&fdb->wakeupcall_timer,
++			    br_multicast_send_wakeupcall, 0);
++#endif
++
+ 	err = rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, &fdb->rhnode,
+ 					    br_fdb_rht_params);
+ 	if (err) {
+diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
+index 4540c76d6079..d4644aab7dbf 100644
+--- a/net/bridge/br_input.c
++++ b/net/bridge/br_input.c
+@@ -204,8 +204,10 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
+ 	if (dst) {
+ 		unsigned long now = jiffies;
+ 
+-		if (test_bit(BR_FDB_LOCAL, &dst->flags))
++		if (test_bit(BR_FDB_LOCAL, &dst->flags)) {
++			br_multicast_wakeupcall_rcv(brmctx, pmctx, skb, vid);
+ 			return br_pass_frame_up(skb, false);
++		}
+ 
+ 		if (now != dst->used)
+ 			dst->used = now;
+diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
+index c38244d60ff8..df3a4d4dbb8f 100644
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -1076,15 +1076,16 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brm
+ 						    const struct in6_addr *group,
+ 						    bool with_srcs, bool over_llqt,
+ 						    u8 sflag, u8 *igmp_type,
+-						    bool *need_rexmit)
++						    bool *need_rexmit,
++						    bool delay)
+ {
+ 	struct net_bridge_port *p = pg ? pg->key.port : NULL;
+ 	struct net_bridge_group_src *ent;
+ 	size_t pkt_size, mld_hdr_size;
+ 	unsigned long now = jiffies;
++	unsigned long interval = 0;
+ 	struct mld2_query *mld2q;
+ 	void *csum_start = NULL;
+-	unsigned long interval;
+ 	__sum16 *csum = NULL;
+ 	struct ipv6hdr *ip6h;
+ 	struct mld_msg *mldq;
+@@ -1166,9 +1167,13 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brm
+ 
+ 	/* ICMPv6 */
+ 	skb_set_transport_header(skb, skb->len);
+-	interval = ipv6_addr_any(group) ?
+-			brmctx->multicast_query_response_interval :
+-			brmctx->multicast_last_member_interval;
++	if (delay) {
++		interval = ipv6_addr_any(group) ?
++				brmctx->multicast_query_response_interval :
++				brmctx->multicast_last_member_interval;
++		interval = jiffies_to_msecs(interval);
++	}
++
+ 	*igmp_type = ICMPV6_MGM_QUERY;
+ 	switch (brmctx->multicast_mld_version) {
+ 	case 1:
+@@ -1176,7 +1181,7 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brm
+ 		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_maxdelay = htons((u16)interval);
+ 		mldq->mld_reserved = 0;
+ 		mldq->mld_mca = *group;
+ 		csum = &mldq->mld_cksum;
+@@ -1267,7 +1272,7 @@ static struct sk_buff *br_multicast_alloc_query(struct net_bridge_mcast *brmctx,
+ 						    &ip6_dst, &group->dst.ip6,
+ 						    with_srcs, over_lmqt,
+ 						    sflag, igmp_type,
+-						    need_rexmit);
++						    need_rexmit, true);
+ 	}
+ #endif
+ 	}
+@@ -1777,6 +1782,169 @@ static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx,
+ #endif
+ }
+ 
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++
++#define BR_MC_WAKEUP_ID htons(0xEC6B) /* random identifier */
++#define BR_MC_ETH_ZERO { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
++#define BR_MC_IN6_ZERO \
++{ \
++	.s6_addr32[0] = 0, .s6_addr32[1] = 0, \
++	.s6_addr32[2] = 0, .s6_addr32[3] = 0, \
++}
++
++#define BR_MC_IN6_FE80 \
++{ \
++	.s6_addr32[0] = htonl(0xfe800000), \
++	.s6_addr32[1] = 0, \
++	.s6_addr32[2] = htonl(0x000000ff), \
++	.s6_addr32[3] = htonl(0xfe000000), \
++}
++
++#define BR_MC_ECHO_LEN sizeof(pkt->echohdr)
++
++static struct sk_buff *br_multicast_alloc_wakeupcall(struct net_bridge *br,
++						     struct net_bridge_port *port,
++						     u8 *eth_dst)
++{
++	struct in6_addr ip6_src, ip6_dst = BR_MC_IN6_FE80;
++	struct sk_buff *skb;
++	__wsum csum_part;
++	__sum16 csum;
++
++	struct wakeupcall_pkt {
++		struct ethhdr ethhdr;
++		struct ipv6hdr ip6hdr;
++		struct icmp6hdr echohdr;
++	} __packed;
++
++	struct wakeupcall_pkt *pkt;
++
++	static const struct wakeupcall_pkt __pkt_template = {
++		.ethhdr = {
++			.h_dest = BR_MC_ETH_ZERO, // update
++			.h_source = BR_MC_ETH_ZERO, // update
++			.h_proto = htons(ETH_P_IPV6),
++		},
++		.ip6hdr = {
++			.priority = 0,
++			.version = 0x6,
++			.flow_lbl = { 0x00, 0x00, 0x00 },
++			.payload_len = htons(BR_MC_ECHO_LEN),
++			.nexthdr = IPPROTO_ICMPV6,
++			.hop_limit = 1,
++			.saddr = BR_MC_IN6_ZERO, // update
++			.daddr = BR_MC_IN6_ZERO, // update
++		},
++		.echohdr = {
++			.icmp6_type = ICMPV6_ECHO_REQUEST,
++			.icmp6_code = 0,
++			.icmp6_cksum = 0, // update
++			.icmp6_dataun.u_echo = {
++				.identifier = BR_MC_WAKEUP_ID,
++				.sequence = 0,
++			},
++		},
++	};
++
++	memcpy(&ip6_dst.s6_addr32[2], &eth_dst[0], ETH_ALEN / 2);
++	memcpy(&ip6_dst.s6_addr[13], &eth_dst[3], ETH_ALEN / 2);
++	ip6_dst.s6_addr[8] ^= 0x02;
++	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6_dst, 0,
++			       &ip6_src))
++		return NULL;
++
++	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*pkt));
++	if (!skb)
++		return NULL;
++
++	skb->protocol = htons(ETH_P_IPV6);
++	skb->dev = port->dev;
++
++	pkt = (struct wakeupcall_pkt *)skb->data;
++	*pkt = __pkt_template;
++
++	ether_addr_copy(pkt->ethhdr.h_source, br->dev->dev_addr);
++	ether_addr_copy(pkt->ethhdr.h_dest, eth_dst);
++
++	pkt->ip6hdr.saddr = ip6_src;
++	pkt->ip6hdr.daddr = ip6_dst;
++
++	csum_part = csum_partial(&pkt->echohdr, sizeof(pkt->echohdr), 0);
++	csum = csum_ipv6_magic(&ip6_src, &ip6_dst, sizeof(pkt->echohdr),
++			       IPPROTO_ICMPV6, csum_part);
++	pkt->echohdr.icmp6_cksum = csum;
++
++	skb_reset_mac_header(skb);
++	skb_set_network_header(skb, offsetof(struct wakeupcall_pkt, ip6hdr));
++	skb_set_transport_header(skb, offsetof(struct wakeupcall_pkt, echohdr));
++	skb_put(skb, sizeof(*pkt));
++	__skb_pull(skb, sizeof(pkt->ethhdr));
++
++	return skb;
++}
++
++void br_multicast_send_wakeupcall(struct timer_list *t)
++{
++	struct net_bridge_fdb_entry *fdb = from_timer(fdb, t, wakeupcall_timer);
++	struct net_bridge_port *port = fdb->dst;
++	struct net_bridge *br = port->br;
++	struct sk_buff *skb, *skb0;
++	int i;
++
++	skb0 = br_multicast_alloc_wakeupcall(br, port, fdb->key.addr.addr);
++	if (!skb0)
++		return;
++
++	for (i = port->wakeupcall_num_rings; i > 0; i--) {
++		if (i > 1) {
++			skb = skb_clone(skb0, GFP_ATOMIC);
++			if (!skb) {
++				kfree_skb(skb0);
++				break;
++			}
++		} else {
++			skb = skb0;
++		}
++
++		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
++			dev_net(port->dev), NULL, skb, NULL, skb->dev,
++			br_dev_queue_push_xmit);
++	}
++}
++
++static void
++br_multicast_schedule_wakeupcalls(struct net_bridge_mcast *brmctx,
++				  struct net_bridge_mcast_port *pmctx,
++				  const struct in6_addr *group)
++{
++	struct net_bridge_fdb_entry *fdb;
++	unsigned long delay;
++
++	rcu_read_lock();
++	hlist_for_each_entry_rcu(fdb, &brmctx->br->fdb_list, fdb_node) {
++		if (!fdb->dst || fdb->dst->dev != pmctx->port->dev)
++			continue;
++
++		/* Wake-up calls to VLANs unsupported for now */
++		if (fdb->key.vlan_id)
++			continue;
++
++		/* Spread the ICMPv6 Echo Requests to avoid congestion.
++		 * We then won't use a max response delay for the queries later,
++		 * as that would be redundant. Spread randomly by a little less
++		 * than max response delay to anticipate the extra round trip.
++		 */
++		delay =	ipv6_addr_any(group) ?
++				brmctx->multicast_query_response_interval :
++				brmctx->multicast_last_member_interval;
++		delay = get_random_u32_below(3 * delay / 4);
++
++		timer_reduce(&fdb->wakeupcall_timer, jiffies + delay);
++	}
++	rcu_read_unlock();
++}
++#endif /* CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS */
++
+ static void __br_multicast_send_query(struct net_bridge_mcast *brmctx,
+ 				      struct net_bridge_mcast_port *pmctx,
+ 				      struct net_bridge_port_group *pg,
+@@ -1809,6 +1977,13 @@ static void __br_multicast_send_query(struct net_bridge_mcast *brmctx,
+ 			dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev,
+ 			br_dev_queue_push_xmit);
+ 
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++		if (pmctx->port->wakeupcall_num_rings &&
++		    group->proto == htons(ETH_P_IPV6))
++			br_multicast_schedule_wakeupcalls(brmctx, pmctx,
++							  &group->dst.ip6);
++#endif
++
+ 		if (over_lmqt && with_srcs && sflag) {
+ 			over_lmqt = false;
+ 			goto again_under_lmqt;
+@@ -3976,6 +4151,99 @@ int br_multicast_rcv(struct net_bridge_mcast **brmctx,
+ 	return ret;
+ }
+ 
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++
++static bool br_multicast_wakeupcall_check(struct net_bridge *br,
++					  struct net_bridge_port *port,
++					  struct sk_buff *skb, u16 vid)
++{
++	struct ethhdr *eth = eth_hdr(skb);
++	const struct ipv6hdr *ip6h;
++	unsigned int offset, len;
++	struct icmp6hdr *icmp6h;
++
++	/* Wake-up calls to VLANs unsupported for now */
++	if (!port->wakeupcall_num_rings || vid ||
++	    eth->h_proto != htons(ETH_P_IPV6))
++		return false;
++
++	if (!ether_addr_equal(eth->h_dest, br->dev->dev_addr) ||
++	    is_multicast_ether_addr(eth->h_source) ||
++	    is_zero_ether_addr(eth->h_source))
++		return false;
++
++	offset = skb_network_offset(skb) + sizeof(*ip6h);
++	if (!pskb_may_pull(skb, offset))
++		return false;
++
++	ip6h = ipv6_hdr(skb);
++
++	if (ip6h->version != 6)
++		return false;
++
++	len = offset + ntohs(ip6h->payload_len);
++	if (skb->len < len || len <= offset)
++		return false;
++
++	if (ip6h->nexthdr != IPPROTO_ICMPV6)
++		return false;
++
++	skb_set_transport_header(skb, offset);
++
++	if (ipv6_mc_check_icmpv6(skb) < 0)
++		return false;
++
++	icmp6h = (struct icmp6hdr *)skb_transport_header(skb);
++	if (icmp6h->icmp6_type != ICMPV6_ECHO_REPLY ||
++	    icmp6h->icmp6_dataun.u_echo.identifier != BR_MC_WAKEUP_ID)
++		return false;
++
++	return true;
++}
++
++static void br_multicast_wakeupcall_send_mldq(struct net_bridge_mcast *brmctx,
++					      struct net_bridge_mcast_port *pmctx,
++					      const u8 *eth_dst)
++{
++	const struct in6_addr group = BR_MC_IN6_ZERO;
++	struct in6_addr ip6_dst;
++	struct sk_buff *skb;
++	u8 igmp_type;
++
++	/* we might have been triggered by multicast-address-specific query
++	 * but reply with a general MLD query for now to keep things simple
++	 */
++	ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0, htonl(1));
++
++	skb = br_ip6_multicast_alloc_query(brmctx, pmctx, NULL, &ip6_dst,
++					   &group, false, false, false,
++					   &igmp_type, NULL, false);
++	if (!skb)
++		return;
++
++	skb->dev = pmctx->port->dev;
++	ether_addr_copy(eth_hdr(skb)->h_dest, eth_dst);
++
++	br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type,
++			   BR_MCAST_DIR_TX);
++	NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
++		dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev,
++		br_dev_queue_push_xmit);
++}
++
++void br_multicast_wakeupcall_rcv(struct net_bridge_mcast *brmctx,
++				 struct net_bridge_mcast_port *pmctx,
++				 struct sk_buff *skb, u16 vid)
++{
++	if (!br_multicast_wakeupcall_check(brmctx->br, pmctx->port, skb, vid))
++		return;
++
++	br_multicast_wakeupcall_send_mldq(brmctx, pmctx,
++					  eth_hdr(skb)->h_source);
++}
++
++#endif /* CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS */
++
+ static void br_multicast_query_expired(struct net_bridge_mcast *brmctx,
+ 				       struct bridge_mcast_own_query *query,
+ 				       struct bridge_mcast_querier *querier)
+@@ -4504,6 +4772,15 @@ int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router)
+ 	return err;
+ }
+ 
++int br_multicast_set_wakeupcall(struct net_bridge_port *p, unsigned long val)
++{
++	if (val > U8_MAX)
++		return -EINVAL;
++
++	p->wakeupcall_num_rings = val;
++	return 0;
++}
++
+ static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
+ 				       struct bridge_mcast_own_query *query)
+ {
+diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
+index a760d5a5ad12..8fdabad8e10a 100644
+--- a/net/bridge/br_netlink.c
++++ b/net/bridge/br_netlink.c
+@@ -206,6 +206,9 @@ static inline size_t br_port_info_size(void)
+ 		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MULTICAST_ROUTER */
+ 		+ nla_total_size(sizeof(u32))	/* IFLA_BRPORT_MCAST_N_GROUPS */
+ 		+ nla_total_size(sizeof(u32))	/* IFLA_BRPORT_MCAST_MAX_GROUPS */
++#endif
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MCAST_WAKEUPCALL */
+ #endif
+ 		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_GROUP_FWD_MASK */
+ 		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MRP_RING_OPEN */
+@@ -313,6 +316,11 @@ static int br_port_fill_attrs(struct sk_buff *skb,
+ 			br_multicast_ngroups_get_max(&p->multicast_ctx)))
+ 		return -EMSGSIZE;
+ #endif
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++	if (nla_put_u8(skb, IFLA_BRPORT_MCAST_WAKEUPCALL,
++		       p->wakeupcall_num_rings))
++		return -EMSGSIZE;
++#endif
+ 
+ 	/* we might be called only with br->lock */
+ 	rcu_read_lock();
+@@ -890,6 +898,7 @@ static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
+ 	[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_WAKEUPCALL] = { .type = NLA_U8 },
+ 	[IFLA_BRPORT_MCAST_FLOOD] = { .type = NLA_U8 },
+ 	[IFLA_BRPORT_BCAST_FLOOD] = { .type = NLA_U8 },
+ 	[IFLA_BRPORT_VLAN_TUNNEL] = { .type = NLA_U8 },
+@@ -1051,6 +1060,16 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[],
+ 	}
+ #endif
+ 
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++	if (tb[IFLA_BRPORT_MCAST_WAKEUPCALL]) {
++		u8 wakeupcall = nla_get_u8(tb[IFLA_BRPORT_MCAST_WAKEUPCALL]);
++
++		err = br_multicast_set_wakeupcall(p, wakeupcall);
++		if (err)
++			return err;
++	}
++#endif
++
+ 	if (tb[IFLA_BRPORT_GROUP_FWD_MASK]) {
+ 		u16 fwd_mask = nla_get_u16(tb[IFLA_BRPORT_GROUP_FWD_MASK]);
+ 
+diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
+index 72d80fd943a8..b237c39edd35 100644
+--- a/net/bridge/br_private.h
++++ b/net/bridge/br_private.h
+@@ -294,6 +294,10 @@ struct net_bridge_fdb_entry {
+ 	unsigned long			used;
+ 
+ 	struct rcu_head			rcu;
++
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++	struct timer_list		wakeupcall_timer;
++#endif
+ };
+ 
+ struct net_bridge_fdb_flush_desc {
+@@ -417,6 +421,7 @@ struct net_bridge_port {
+ 	u32				multicast_eht_hosts_limit;
+ 	u32				multicast_eht_hosts_cnt;
+ 	struct hlist_head		mglist;
++	u8				wakeupcall_num_rings;
+ #endif
+ 
+ #ifdef CONFIG_SYSFS
+@@ -1504,6 +1509,21 @@ br_multicast_ctx_options_equal(const struct net_bridge_mcast *brmctx1,
+ }
+ #endif
+ 
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++void br_multicast_wakeupcall_rcv(struct net_bridge_mcast *brmctx,
++				 struct net_bridge_mcast_port *pmctx,
++				 struct sk_buff *skb, u16 vid);
++void br_multicast_send_wakeupcall(struct timer_list *t);
++int br_multicast_set_wakeupcall(struct net_bridge_port *p, unsigned long val);
++#else
++static inline void
++br_multicast_wakeupcall_rcv(struct net_bridge_mcast *brmctx,
++			    struct net_bridge_mcast_port *pmctx,
++			    struct sk_buff *skb, u16 vid)
++{
++}
++#endif /* CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS */
++
+ /* br_vlan.c */
+ #ifdef CONFIG_BRIDGE_VLAN_FILTERING
+ bool br_allowed_ingress(const struct net_bridge *br,
+diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
+index aee7c5902206..15ee27e1aa72 100644
+--- a/net/bridge/br_sysfs_if.c
++++ b/net/bridge/br_sysfs_if.c
+@@ -260,6 +260,21 @@ BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
+ BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
+ #endif
+ 
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++static ssize_t show_multicast_wakeupcall(struct net_bridge_port *p, char *buf)
++{
++	return sprintf(buf, "%d\n", p->wakeupcall_num_rings);
++}
++
++static int store_multicast_wakeupcall(struct net_bridge_port *p,
++				      unsigned long v)
++{
++	return br_multicast_set_wakeupcall(p, v);
++}
++static BRPORT_ATTR(multicast_wakeupcall, 0644, show_multicast_wakeupcall,
++		   store_multicast_wakeupcall);
++#endif
++
+ static const struct brport_attribute *brport_attrs[] = {
+ 	&brport_attr_path_cost,
+ 	&brport_attr_priority,
+@@ -285,6 +300,9 @@ static const struct brport_attribute *brport_attrs[] = {
+ 	&brport_attr_multicast_router,
+ 	&brport_attr_multicast_fast_leave,
+ 	&brport_attr_multicast_to_unicast,
++#endif
++#ifdef CONFIG_BRIDGE_IGMP_SNOOPING_WAKEUPCALLS
++	&brport_attr_multicast_wakeupcall,
+ #endif
+ 	&brport_attr_proxyarp,
+ 	&brport_attr_proxyarp_wifi,
+diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
+index 71797d44af4c..abe17f8c4939 100644
+--- a/net/core/rtnetlink.c
++++ b/net/core/rtnetlink.c
+@@ -61,7 +61,7 @@
+ #include "dev.h"
+ 
+ #define RTNL_MAX_TYPE		50
+-#define RTNL_SLAVE_MAX_TYPE	45
++#define RTNL_SLAVE_MAX_TYPE	46
+ 
+ struct rtnl_link {
+ 	rtnl_doit_func		doit;
+diff --git a/net/ipv6/mcast_snoop.c b/net/ipv6/mcast_snoop.c
+index 04d5fcdfa6e0..9a5061edbaf3 100644
+--- a/net/ipv6/mcast_snoop.c
++++ b/net/ipv6/mcast_snoop.c
+@@ -131,7 +131,7 @@ static inline __sum16 ipv6_mc_validate_checksum(struct sk_buff *skb)
+ 	return skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo);
+ }
+ 
+-static int ipv6_mc_check_icmpv6(struct sk_buff *skb)
++int ipv6_mc_check_icmpv6(struct sk_buff *skb)
+ {
+ 	unsigned int len = skb_transport_offset(skb) + sizeof(struct icmp6hdr);
+ 	unsigned int transport_len = ipv6_transport_len(skb);
+@@ -150,6 +150,7 @@ static int ipv6_mc_check_icmpv6(struct sk_buff *skb)
+ 
+ 	return 0;
+ }
++EXPORT_SYMBOL(ipv6_mc_check_icmpv6);
+ 
+ /**
+  * ipv6_mc_check_mld - checks whether this is a sane MLD packet
+-- 
+2.45.2
+
