--- /dev/null
+--- 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_ISOLATE_MODE BIT(11)
++#define BR_MULTICAST_TO_UCAST BIT(12)
+
+ extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
+
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -635,7 +635,8 @@ 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 state)
++ unsigned char state,
++ const unsigned char *src)
+ {
+ struct net_bridge_port_group *p;
+
+@@ -650,12 +651,33 @@ 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_UCAST) && src) {
++ memcpy(p->eth_addr, src, ETH_ALEN);
++ p->unicast = true;
++ }
+ 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->unicast)
++ 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;
+@@ -682,13 +704,13 @@ 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, MDB_TEMPORARY);
++ p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY, src);
+ if (unlikely(!p))
+ goto err;
+ rcu_assign_pointer(*pp, p);
+@@ -707,7 +729,7 @@ 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;
+
+@@ -718,14 +740,14 @@ 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;
+
+@@ -736,7 +758,10 @@ 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);
++ if (ipv6_addr_is_solict_mult(group))
++ src = NULL;
++
++ return br_multicast_add_group(br, port, &br_group, src);
+ }
+ #endif
+
+@@ -966,6 +991,7 @@ static int br_ip4_multicast_igmp3_report
+ struct sk_buff *skb,
+ u16 vid)
+ {
++ const unsigned char *src = eth_hdr(skb)->h_source;
+ struct igmpv3_report *ih;
+ struct igmpv3_grec *grec;
+ int i;
+@@ -1009,7 +1035,7 @@ static int br_ip4_multicast_igmp3_report
+ continue;
+ }
+
+- err = br_ip4_multicast_add_group(br, port, group, vid);
++ err = br_ip4_multicast_add_group(br, port, group, vid, src);
+ if (err)
+ break;
+ }
+@@ -1023,6 +1049,7 @@ 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;
+@@ -1071,7 +1098,7 @@ static int br_ip6_multicast_mld2_report(
+ }
+
+ err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
+- vid);
++ vid, src);
+ if (err)
+ break;
+ }
+@@ -1407,7 +1434,8 @@ 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;
+@@ -1457,7 +1485,7 @@ 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);
+@@ -1491,7 +1519,7 @@ 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) &&
+@@ -1509,8 +1537,8 @@ out:
+
+ static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+- __be32 group,
+- __u16 vid)
++ __be32 group, __u16 vid,
++ const unsigned char *src)
+ {
+ struct br_ip br_group;
+ struct bridge_mcast_own_query *own_query;
+@@ -1525,14 +1553,14 @@ 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;
+@@ -1547,7 +1575,7 @@ 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
+
+@@ -1556,6 +1584,7 @@ static int br_multicast_ipv4_rcv(struct
+ struct sk_buff *skb,
+ u16 vid)
+ {
++ const unsigned char *src = eth_hdr(skb)->h_source;
+ struct sk_buff *skb2 = skb;
+ const struct iphdr *iph;
+ struct igmphdr *ih;
+@@ -1629,7 +1658,7 @@ static int br_multicast_ipv4_rcv(struct
+ 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, skb2, vid);
+@@ -1638,7 +1667,7 @@ static int br_multicast_ipv4_rcv(struct
+ err = br_ip4_multicast_query(br, port, skb2, 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;
+ }
+
+@@ -1656,6 +1685,7 @@ static int br_multicast_ipv6_rcv(struct
+ struct sk_buff *skb,
+ u16 vid)
+ {
++ const unsigned char *src = eth_hdr(skb)->h_source;
+ struct sk_buff *skb2;
+ const struct ipv6hdr *ip6h;
+ u8 icmp6_type;
+@@ -1765,7 +1795,8 @@ static int br_multicast_ipv6_rcv(struct
+ }
+ mld = (struct mld_msg *)skb_transport_header(skb2);
+ 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:
+@@ -1782,7 +1813,7 @@ static int br_multicast_ipv6_rcv(struct
+ goto out;
+ }
+ mld = (struct mld_msg *)skb_transport_header(skb2);
+- br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
++ br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
+ }
+ }
+
+--- a/net/bridge/br_private.h
++++ b/net/bridge/br_private.h
+@@ -113,6 +113,9 @@ struct net_bridge_port_group {
+ struct timer_list timer;
+ struct br_ip addr;
+ unsigned char state;
++
++ unsigned char eth_addr[ETH_ALEN];
++ bool unicast;
+ };
+
+ struct net_bridge_mdb_entry
+@@ -481,7 +484,8 @@ 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 state);
++ unsigned char state,
++ 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_mdb.c
++++ b/net/bridge/br_mdb.c
+@@ -343,7 +343,7 @@ 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_forward.c
++++ b/net/bridge/br_forward.c
+@@ -169,6 +169,29 @@ out:
+ return p;
+ }
+
++static struct net_bridge_port *maybe_deliver_addr(
++ struct net_bridge_port *prev, struct net_bridge_port *p,
++ struct sk_buff *skb, const unsigned char *addr,
++ void (*__packet_hook)(const struct net_bridge_port *p,
++ struct sk_buff *skb))
++{
++ struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
++
++ if (!should_deliver(p, skb))
++ return prev;
++
++ skb = skb_copy(skb, GFP_ATOMIC);
++ if (!skb) {
++ dev->stats.tx_dropped++;
++ return prev;
++ }
++
++ memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
++ __packet_hook(p, skb);
++
++ return prev;
++}
++
+ /* called under bridge lock */
+ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
+ struct sk_buff *skb0,
+@@ -241,6 +264,7 @@ static void br_multicast_flood(struct ne
+ struct net_bridge_port *prev = NULL;
+ struct net_bridge_port_group *p;
+ struct hlist_node *rp;
++ const unsigned char *addr;
+
+ rp = rcu_dereference(hlist_first_rcu(&br->router_list));
+ p = mdst ? rcu_dereference(mdst->ports) : NULL;
+@@ -251,10 +275,19 @@ static void br_multicast_flood(struct ne
+ rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
+ NULL;
+
+- port = (unsigned long)lport > (unsigned long)rport ?
+- lport : rport;
+-
+- prev = maybe_deliver(prev, port, skb, __packet_hook);
++ if ((unsigned long)lport > (unsigned long)rport) {
++ port = lport;
++ addr = p->unicast ? p->eth_addr : NULL;
++ } else {
++ port = rport;
++ addr = NULL;
++ }
++
++ if (addr)
++ prev = maybe_deliver_addr(prev, port, skb, addr,
++ __packet_hook);
++ else
++ prev = maybe_deliver(prev, port, skb, __packet_hook);
+ if (IS_ERR(prev))
+ goto out;
+
+--- a/net/bridge/br_sysfs_if.c
++++ b/net/bridge/br_sysfs_if.c
+@@ -204,6 +204,7 @@ 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_UCAST);
+ #endif
+
+ static const struct brport_attribute *brport_attrs[] = {
+@@ -230,6 +231,7 @@ 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,
projects / openwrt.git / blobdiff