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-rw-r--r--target/linux/generic/backport-4.9/021-bridge-multicast-to-unicast.patch499
1 files changed, 499 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/021-bridge-multicast-to-unicast.patch b/target/linux/generic/backport-4.9/021-bridge-multicast-to-unicast.patch
new file mode 100644
index 0000000000..d3b4a62361
--- /dev/null
+++ b/target/linux/generic/backport-4.9/021-bridge-multicast-to-unicast.patch
@@ -0,0 +1,499 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 19 Jan 2017 03:45:10 +0100
+Subject: [PATCH] bridge: multicast to unicast
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Implements an optional, per bridge port flag and feature to deliver
+multicast packets to any host on the according port via unicast
+individually. This is done by copying the packet per host and
+changing the multicast destination MAC to a unicast one accordingly.
+
+multicast-to-unicast works on top of the multicast snooping feature of
+the bridge. Which means unicast copies are only delivered to hosts which
+are interested in it and signalized this via IGMP/MLD reports
+previously.
+
+This feature is intended for interface types which have a more reliable
+and/or efficient way to deliver unicast packets than broadcast ones
+(e.g. wifi).
+
+However, it should only be enabled on interfaces where no IGMPv2/MLDv1
+report suppression takes place. This feature is disabled by default.
+
+The initial patch and idea is from Felix Fietkau.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+[linus.luessing@c0d3.blue: various bug + style fixes, commit message]
+Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
+---
+
+--- a/include/linux/if_bridge.h
++++ b/include/linux/if_bridge.h
+@@ -46,6 +46,7 @@ struct br_ip_list {
+ #define BR_LEARNING_SYNC BIT(9)
+ #define BR_PROXYARP_WIFI BIT(10)
+ #define BR_MCAST_FLOOD BIT(11)
++#define BR_MULTICAST_TO_UNICAST BIT(12)
+
+ #define BR_DEFAULT_AGEING_TIME (300 * HZ)
+
+--- a/include/uapi/linux/if_link.h
++++ b/include/uapi/linux/if_link.h
+@@ -319,6 +319,7 @@ enum {
+ IFLA_BRPORT_MULTICAST_ROUTER,
+ IFLA_BRPORT_PAD,
+ IFLA_BRPORT_MCAST_FLOOD,
++ IFLA_BRPORT_MCAST_TO_UCAST,
+ __IFLA_BRPORT_MAX
+ };
+ #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
+--- a/net/bridge/br_forward.c
++++ b/net/bridge/br_forward.c
+@@ -174,6 +174,29 @@ out:
+ return p;
+ }
+
++static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
++ const unsigned char *addr, bool local_orig)
++{
++ struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
++ const unsigned char *src = eth_hdr(skb)->h_source;
++
++ if (!should_deliver(p, skb))
++ return;
++
++ /* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
++ if (skb->dev == p->dev && ether_addr_equal(src, addr))
++ return;
++
++ skb = skb_copy(skb, GFP_ATOMIC);
++ if (!skb) {
++ dev->stats.tx_dropped++;
++ return;
++ }
++
++ memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
++ __br_forward(p, skb, local_orig);
++}
++
+ /* called under rcu_read_lock */
+ void br_flood(struct net_bridge *br, struct sk_buff *skb,
+ enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
+@@ -242,10 +265,20 @@ void br_multicast_flood(struct net_bridg
+ rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
+ NULL;
+
+- port = (unsigned long)lport > (unsigned long)rport ?
+- lport : rport;
++ if ((unsigned long)lport > (unsigned long)rport) {
++ port = lport;
++
++ if (p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST) {
++ maybe_deliver_addr(lport, skb, p->eth_addr,
++ local_orig);
++ goto delivered;
++ }
++ } else {
++ port = rport;
++ }
+
+ prev = maybe_deliver(prev, port, skb, local_orig);
++delivered:
+ if (IS_ERR(prev))
+ goto out;
+ if (prev == port)
+--- a/net/bridge/br_mdb.c
++++ b/net/bridge/br_mdb.c
+@@ -531,7 +531,7 @@ static int br_mdb_add_group(struct net_b
+ break;
+ }
+
+- p = br_multicast_new_port_group(port, group, *pp, state);
++ p = br_multicast_new_port_group(port, group, *pp, state, NULL);
+ if (unlikely(!p))
+ return -ENOMEM;
+ rcu_assign_pointer(*pp, p);
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -42,12 +42,14 @@ static void br_multicast_add_router(stru
+ static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 group,
+- __u16 vid);
++ __u16 vid,
++ const unsigned char *src);
++
+ #if IS_ENABLED(CONFIG_IPV6)
+ static void br_ip6_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct in6_addr *group,
+- __u16 vid);
++ __u16 vid, const unsigned char *src);
+ #endif
+ unsigned int br_mdb_rehash_seq;
+
+@@ -658,7 +660,8 @@ struct net_bridge_port_group *br_multica
+ struct net_bridge_port *port,
+ struct br_ip *group,
+ struct net_bridge_port_group __rcu *next,
+- unsigned char flags)
++ unsigned char flags,
++ const unsigned char *src)
+ {
+ struct net_bridge_port_group *p;
+
+@@ -673,12 +676,39 @@ struct net_bridge_port_group *br_multica
+ hlist_add_head(&p->mglist, &port->mglist);
+ setup_timer(&p->timer, br_multicast_port_group_expired,
+ (unsigned long)p);
++
++ if ((port->flags & BR_MULTICAST_TO_UNICAST) && src) {
++ memcpy(p->eth_addr, src, ETH_ALEN);
++ p->flags |= MDB_PG_FLAGS_MCAST_TO_UCAST;
++ }
++
+ return p;
+ }
+
++static bool br_port_group_equal(struct net_bridge_port_group *p,
++ struct net_bridge_port *port,
++ const unsigned char *src)
++{
++ if (p->port != port)
++ return false;
++
++ if (!(p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST) !=
++ !(port->flags & BR_MULTICAST_TO_UNICAST))
++ return false;
++
++ if (!(p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST))
++ return true;
++
++ if (!src)
++ return false;
++
++ return ether_addr_equal(src, p->eth_addr);
++}
++
+ static int br_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+- struct br_ip *group)
++ struct br_ip *group,
++ const unsigned char *src)
+ {
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p;
+@@ -705,13 +735,13 @@ static int br_multicast_add_group(struct
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+- if (p->port == port)
++ if (br_port_group_equal(p, port, src))
+ goto found;
+ if ((unsigned long)p->port < (unsigned long)port)
+ break;
+ }
+
+- p = br_multicast_new_port_group(port, group, *pp, 0);
++ p = br_multicast_new_port_group(port, group, *pp, 0, src);
+ if (unlikely(!p))
+ goto err;
+ rcu_assign_pointer(*pp, p);
+@@ -730,7 +760,8 @@ err:
+ static int br_ip4_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 group,
+- __u16 vid)
++ __u16 vid,
++ const unsigned char *src)
+ {
+ struct br_ip br_group;
+
+@@ -741,14 +772,15 @@ static int br_ip4_multicast_add_group(st
+ br_group.proto = htons(ETH_P_IP);
+ br_group.vid = vid;
+
+- return br_multicast_add_group(br, port, &br_group);
++ return br_multicast_add_group(br, port, &br_group, src);
+ }
+
+ #if IS_ENABLED(CONFIG_IPV6)
+ static int br_ip6_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct in6_addr *group,
+- __u16 vid)
++ __u16 vid,
++ const unsigned char *src)
+ {
+ struct br_ip br_group;
+
+@@ -759,7 +791,7 @@ static int br_ip6_multicast_add_group(st
+ br_group.proto = htons(ETH_P_IPV6);
+ br_group.vid = vid;
+
+- return br_multicast_add_group(br, port, &br_group);
++ return br_multicast_add_group(br, port, &br_group, src);
+ }
+ #endif
+
+@@ -1028,6 +1060,7 @@ static int br_ip4_multicast_igmp3_report
+ struct sk_buff *skb,
+ u16 vid)
+ {
++ const unsigned char *src;
+ struct igmpv3_report *ih;
+ struct igmpv3_grec *grec;
+ int i;
+@@ -1068,12 +1101,14 @@ static int br_ip4_multicast_igmp3_report
+ continue;
+ }
+
++ src = eth_hdr(skb)->h_source;
+ if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
+ type == IGMPV3_MODE_IS_INCLUDE) &&
+ ntohs(grec->grec_nsrcs) == 0) {
+- br_ip4_multicast_leave_group(br, port, group, vid);
++ br_ip4_multicast_leave_group(br, port, group, vid, src);
+ } else {
+- err = br_ip4_multicast_add_group(br, port, group, vid);
++ err = br_ip4_multicast_add_group(br, port, group, vid,
++ src);
+ if (err)
+ break;
+ }
+@@ -1088,6 +1123,7 @@ static int br_ip6_multicast_mld2_report(
+ struct sk_buff *skb,
+ u16 vid)
+ {
++ const unsigned char *src = eth_hdr(skb)->h_source;
+ struct icmp6hdr *icmp6h;
+ struct mld2_grec *grec;
+ int i;
+@@ -1139,10 +1175,11 @@ static int br_ip6_multicast_mld2_report(
+ grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
+ ntohs(*nsrcs) == 0) {
+ br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
+- vid);
++ vid, src);
+ } else {
+ err = br_ip6_multicast_add_group(br, port,
+- &grec->grec_mca, vid);
++ &grec->grec_mca, vid,
++ src);
+ if (err)
+ break;
+ }
+@@ -1458,7 +1495,8 @@ br_multicast_leave_group(struct net_brid
+ struct net_bridge_port *port,
+ struct br_ip *group,
+ struct bridge_mcast_other_query *other_query,
+- struct bridge_mcast_own_query *own_query)
++ struct bridge_mcast_own_query *own_query,
++ const unsigned char *src)
+ {
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_mdb_entry *mp;
+@@ -1482,7 +1520,7 @@ br_multicast_leave_group(struct net_brid
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+- if (p->port != port)
++ if (!br_port_group_equal(p, port, src))
+ continue;
+
+ rcu_assign_pointer(*pp, p->next);
+@@ -1513,7 +1551,7 @@ br_multicast_leave_group(struct net_brid
+ for (p = mlock_dereference(mp->ports, br);
+ p != NULL;
+ p = mlock_dereference(p->next, br)) {
+- if (p->port != port)
++ if (!br_port_group_equal(p, port, src))
+ continue;
+
+ if (!hlist_unhashed(&p->mglist) &&
+@@ -1564,7 +1602,8 @@ out:
+ static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 group,
+- __u16 vid)
++ __u16 vid,
++ const unsigned char *src)
+ {
+ struct br_ip br_group;
+ struct bridge_mcast_own_query *own_query;
+@@ -1579,14 +1618,15 @@ static void br_ip4_multicast_leave_group
+ br_group.vid = vid;
+
+ br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
+- own_query);
++ own_query, src);
+ }
+
+ #if IS_ENABLED(CONFIG_IPV6)
+ static void br_ip6_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct in6_addr *group,
+- __u16 vid)
++ __u16 vid,
++ const unsigned char *src)
+ {
+ struct br_ip br_group;
+ struct bridge_mcast_own_query *own_query;
+@@ -1601,7 +1641,7 @@ static void br_ip6_multicast_leave_group
+ br_group.vid = vid;
+
+ br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
+- own_query);
++ own_query, src);
+ }
+ #endif
+
+@@ -1644,6 +1684,7 @@ static int br_multicast_ipv4_rcv(struct
+ u16 vid)
+ {
+ struct sk_buff *skb_trimmed = NULL;
++ const unsigned char *src;
+ struct igmphdr *ih;
+ int err;
+
+@@ -1659,13 +1700,14 @@ static int br_multicast_ipv4_rcv(struct
+ }
+
+ ih = igmp_hdr(skb);
++ src = eth_hdr(skb)->h_source;
+ BR_INPUT_SKB_CB(skb)->igmp = ih->type;
+
+ switch (ih->type) {
+ case IGMP_HOST_MEMBERSHIP_REPORT:
+ case IGMPV2_HOST_MEMBERSHIP_REPORT:
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+- err = br_ip4_multicast_add_group(br, port, ih->group, vid);
++ err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
+ break;
+ case IGMPV3_HOST_MEMBERSHIP_REPORT:
+ err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
+@@ -1674,7 +1716,7 @@ static int br_multicast_ipv4_rcv(struct
+ err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
+ break;
+ case IGMP_HOST_LEAVE_MESSAGE:
+- br_ip4_multicast_leave_group(br, port, ih->group, vid);
++ br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
+ break;
+ }
+
+@@ -1694,6 +1736,7 @@ static int br_multicast_ipv6_rcv(struct
+ u16 vid)
+ {
+ struct sk_buff *skb_trimmed = NULL;
++ const unsigned char *src;
+ struct mld_msg *mld;
+ int err;
+
+@@ -1713,8 +1756,10 @@ static int br_multicast_ipv6_rcv(struct
+
+ switch (mld->mld_type) {
+ case ICMPV6_MGM_REPORT:
++ src = eth_hdr(skb)->h_source;
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+- err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
++ err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
++ src);
+ break;
+ case ICMPV6_MLD2_REPORT:
+ err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
+@@ -1723,7 +1768,8 @@ static int br_multicast_ipv6_rcv(struct
+ err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
+ break;
+ case ICMPV6_MGM_REDUCTION:
+- br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
++ src = eth_hdr(skb)->h_source;
++ br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
+ break;
+ }
+
+--- a/net/bridge/br_netlink.c
++++ b/net/bridge/br_netlink.c
+@@ -123,6 +123,7 @@ static inline size_t br_port_info_size(v
+ + 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_PROXYARP */
+@@ -173,6 +174,8 @@ static int br_port_fill_attrs(struct sk_
+ !!(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)) ||
+@@ -586,6 +589,7 @@ static const struct nla_policy br_port_p
+ [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 },
+ };
+
+ /* Change the state of the port and notify spanning tree */
+@@ -636,6 +640,7 @@ static int br_setport(struct net_bridge_
+ 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_PROXYARP, BR_PROXYARP);
+ br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
+
+--- a/net/bridge/br_private.h
++++ b/net/bridge/br_private.h
+@@ -166,8 +166,9 @@ struct net_bridge_fdb_entry
+ struct rcu_head rcu;
+ };
+
+-#define MDB_PG_FLAGS_PERMANENT BIT(0)
+-#define MDB_PG_FLAGS_OFFLOAD BIT(1)
++#define MDB_PG_FLAGS_PERMANENT BIT(0)
++#define MDB_PG_FLAGS_OFFLOAD BIT(1)
++#define MDB_PG_FLAGS_MCAST_TO_UCAST BIT(2)
+
+ struct net_bridge_port_group {
+ struct net_bridge_port *port;
+@@ -177,6 +178,7 @@ struct net_bridge_port_group {
+ struct timer_list timer;
+ struct br_ip addr;
+ unsigned char flags;
++ unsigned char eth_addr[ETH_ALEN];
+ };
+
+ struct net_bridge_mdb_entry
+@@ -591,7 +593,7 @@ void br_multicast_free_pg(struct rcu_hea
+ struct net_bridge_port_group *
+ br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
+ struct net_bridge_port_group __rcu *next,
+- unsigned char flags);
++ unsigned char flags, const unsigned char *src);
+ void br_mdb_init(void);
+ void br_mdb_uninit(void);
+ void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
+--- a/net/bridge/br_sysfs_if.c
++++ b/net/bridge/br_sysfs_if.c
+@@ -188,6 +188,7 @@ static BRPORT_ATTR(multicast_router, S_I
+ store_multicast_router);
+
+ BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
++BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
+ #endif
+
+ static const struct brport_attribute *brport_attrs[] = {
+@@ -214,6 +215,7 @@ static const struct brport_attribute *br
+ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ &brport_attr_multicast_router,
+ &brport_attr_multicast_fast_leave,
++ &brport_attr_multicast_to_unicast,
+ #endif
+ &brport_attr_proxyarp,
+ &brport_attr_proxyarp_wifi,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 12:38:27 +0000