mirror of https://github.com/hak5/openwrt-owl.git
500 lines
16 KiB
Diff
500 lines
16 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Thu, 19 Jan 2017 03:45:10 +0100
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Subject: [PATCH] bridge: multicast to unicast
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Implements an optional, per bridge port flag and feature to deliver
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multicast packets to any host on the according port via unicast
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individually. This is done by copying the packet per host and
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changing the multicast destination MAC to a unicast one accordingly.
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multicast-to-unicast works on top of the multicast snooping feature of
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the bridge. Which means unicast copies are only delivered to hosts which
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are interested in it and signalized this via IGMP/MLD reports
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previously.
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This feature is intended for interface types which have a more reliable
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and/or efficient way to deliver unicast packets than broadcast ones
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(e.g. wifi).
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However, it should only be enabled on interfaces where no IGMPv2/MLDv1
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report suppression takes place. This feature is disabled by default.
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The initial patch and idea is from Felix Fietkau.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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[linus.luessing@c0d3.blue: various bug + style fixes, commit message]
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Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
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---
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--- a/include/linux/if_bridge.h
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+++ b/include/linux/if_bridge.h
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@@ -46,6 +46,7 @@ struct br_ip_list {
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#define BR_LEARNING_SYNC BIT(9)
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#define BR_PROXYARP_WIFI BIT(10)
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#define BR_MCAST_FLOOD BIT(11)
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+#define BR_MULTICAST_TO_UNICAST BIT(12)
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#define BR_DEFAULT_AGEING_TIME (300 * HZ)
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--- a/include/uapi/linux/if_link.h
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+++ b/include/uapi/linux/if_link.h
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@@ -319,6 +319,7 @@ enum {
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IFLA_BRPORT_MULTICAST_ROUTER,
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IFLA_BRPORT_PAD,
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IFLA_BRPORT_MCAST_FLOOD,
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+ IFLA_BRPORT_MCAST_TO_UCAST,
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__IFLA_BRPORT_MAX
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};
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#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
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--- a/net/bridge/br_forward.c
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+++ b/net/bridge/br_forward.c
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@@ -174,6 +174,29 @@ out:
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return p;
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}
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+static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
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+ const unsigned char *addr, bool local_orig)
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+{
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+ struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
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+ const unsigned char *src = eth_hdr(skb)->h_source;
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+
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+ if (!should_deliver(p, skb))
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+ return;
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+
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+ /* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
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+ if (skb->dev == p->dev && ether_addr_equal(src, addr))
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+ return;
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+
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+ skb = skb_copy(skb, GFP_ATOMIC);
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+ if (!skb) {
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+ dev->stats.tx_dropped++;
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+ return;
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+ }
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+
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+ memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
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+ __br_forward(p, skb, local_orig);
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+}
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+
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/* called under rcu_read_lock */
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void br_flood(struct net_bridge *br, struct sk_buff *skb,
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enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
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@@ -241,10 +264,20 @@ void br_multicast_flood(struct net_bridg
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rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
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NULL;
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- port = (unsigned long)lport > (unsigned long)rport ?
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- lport : rport;
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+ if ((unsigned long)lport > (unsigned long)rport) {
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+ port = lport;
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+
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+ if (p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST) {
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+ maybe_deliver_addr(lport, skb, p->eth_addr,
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+ local_orig);
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+ goto delivered;
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+ }
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+ } else {
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+ port = rport;
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+ }
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prev = maybe_deliver(prev, port, skb, local_orig);
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+delivered:
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if (IS_ERR(prev))
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goto out;
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if (prev == port)
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--- a/net/bridge/br_mdb.c
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+++ b/net/bridge/br_mdb.c
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@@ -531,7 +531,7 @@ static int br_mdb_add_group(struct net_b
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break;
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}
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- p = br_multicast_new_port_group(port, group, *pp, state);
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+ p = br_multicast_new_port_group(port, group, *pp, state, NULL);
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if (unlikely(!p))
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return -ENOMEM;
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rcu_assign_pointer(*pp, p);
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--- a/net/bridge/br_multicast.c
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+++ b/net/bridge/br_multicast.c
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@@ -42,12 +42,14 @@ static void br_multicast_add_router(stru
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static void br_ip4_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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__be32 group,
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- __u16 vid);
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+ __u16 vid,
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+ const unsigned char *src);
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+
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#if IS_ENABLED(CONFIG_IPV6)
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static void br_ip6_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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const struct in6_addr *group,
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- __u16 vid);
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+ __u16 vid, const unsigned char *src);
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#endif
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unsigned int br_mdb_rehash_seq;
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@@ -658,7 +660,8 @@ struct net_bridge_port_group *br_multica
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struct net_bridge_port *port,
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struct br_ip *group,
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struct net_bridge_port_group __rcu *next,
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- unsigned char flags)
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+ unsigned char flags,
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+ const unsigned char *src)
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{
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struct net_bridge_port_group *p;
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@@ -673,12 +676,39 @@ struct net_bridge_port_group *br_multica
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hlist_add_head(&p->mglist, &port->mglist);
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setup_timer(&p->timer, br_multicast_port_group_expired,
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(unsigned long)p);
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+
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+ if ((port->flags & BR_MULTICAST_TO_UNICAST) && src) {
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+ memcpy(p->eth_addr, src, ETH_ALEN);
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+ p->flags |= MDB_PG_FLAGS_MCAST_TO_UCAST;
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+ }
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+
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return p;
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}
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+static bool br_port_group_equal(struct net_bridge_port_group *p,
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+ struct net_bridge_port *port,
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+ const unsigned char *src)
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+{
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+ if (p->port != port)
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+ return false;
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+
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+ if (!(p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST) !=
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+ !(port->flags & BR_MULTICAST_TO_UNICAST))
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+ return false;
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+
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+ if (!(p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST))
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+ return true;
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+
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+ if (!src)
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+ return false;
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+
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+ return ether_addr_equal(src, p->eth_addr);
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+}
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+
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static int br_multicast_add_group(struct net_bridge *br,
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struct net_bridge_port *port,
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- struct br_ip *group)
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+ struct br_ip *group,
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+ const unsigned char *src)
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{
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struct net_bridge_mdb_entry *mp;
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struct net_bridge_port_group *p;
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@@ -705,13 +735,13 @@ static int br_multicast_add_group(struct
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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- if (p->port == port)
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+ if (br_port_group_equal(p, port, src))
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goto found;
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if ((unsigned long)p->port < (unsigned long)port)
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break;
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}
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- p = br_multicast_new_port_group(port, group, *pp, 0);
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+ p = br_multicast_new_port_group(port, group, *pp, 0, src);
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if (unlikely(!p))
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goto err;
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rcu_assign_pointer(*pp, p);
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@@ -730,7 +760,8 @@ err:
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static int br_ip4_multicast_add_group(struct net_bridge *br,
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struct net_bridge_port *port,
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__be32 group,
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- __u16 vid)
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+ __u16 vid,
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+ const unsigned char *src)
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{
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struct br_ip br_group;
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@@ -741,14 +772,15 @@ static int br_ip4_multicast_add_group(st
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br_group.proto = htons(ETH_P_IP);
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br_group.vid = vid;
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- return br_multicast_add_group(br, port, &br_group);
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+ return br_multicast_add_group(br, port, &br_group, src);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static int br_ip6_multicast_add_group(struct net_bridge *br,
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struct net_bridge_port *port,
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const struct in6_addr *group,
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- __u16 vid)
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+ __u16 vid,
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+ const unsigned char *src)
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{
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struct br_ip br_group;
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@@ -759,7 +791,7 @@ static int br_ip6_multicast_add_group(st
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br_group.proto = htons(ETH_P_IPV6);
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br_group.vid = vid;
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- return br_multicast_add_group(br, port, &br_group);
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+ return br_multicast_add_group(br, port, &br_group, src);
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}
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#endif
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@@ -1028,6 +1060,7 @@ static int br_ip4_multicast_igmp3_report
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struct sk_buff *skb,
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u16 vid)
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{
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+ const unsigned char *src;
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struct igmpv3_report *ih;
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struct igmpv3_grec *grec;
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int i;
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@@ -1068,12 +1101,14 @@ static int br_ip4_multicast_igmp3_report
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continue;
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}
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+ src = eth_hdr(skb)->h_source;
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if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
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type == IGMPV3_MODE_IS_INCLUDE) &&
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ntohs(grec->grec_nsrcs) == 0) {
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- br_ip4_multicast_leave_group(br, port, group, vid);
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+ br_ip4_multicast_leave_group(br, port, group, vid, src);
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} else {
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- err = br_ip4_multicast_add_group(br, port, group, vid);
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+ err = br_ip4_multicast_add_group(br, port, group, vid,
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+ src);
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if (err)
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break;
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}
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@@ -1088,6 +1123,7 @@ static int br_ip6_multicast_mld2_report(
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struct sk_buff *skb,
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u16 vid)
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{
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+ const unsigned char *src = eth_hdr(skb)->h_source;
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struct icmp6hdr *icmp6h;
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struct mld2_grec *grec;
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int i;
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@@ -1139,10 +1175,11 @@ static int br_ip6_multicast_mld2_report(
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grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
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ntohs(*nsrcs) == 0) {
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br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
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- vid);
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+ vid, src);
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} else {
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err = br_ip6_multicast_add_group(br, port,
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- &grec->grec_mca, vid);
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+ &grec->grec_mca, vid,
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+ src);
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if (err)
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break;
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}
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@@ -1458,7 +1495,8 @@ br_multicast_leave_group(struct net_brid
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struct net_bridge_port *port,
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struct br_ip *group,
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struct bridge_mcast_other_query *other_query,
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- struct bridge_mcast_own_query *own_query)
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+ struct bridge_mcast_own_query *own_query,
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+ const unsigned char *src)
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{
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struct net_bridge_mdb_htable *mdb;
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struct net_bridge_mdb_entry *mp;
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@@ -1482,7 +1520,7 @@ br_multicast_leave_group(struct net_brid
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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- if (p->port != port)
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+ if (!br_port_group_equal(p, port, src))
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continue;
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rcu_assign_pointer(*pp, p->next);
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@@ -1513,7 +1551,7 @@ br_multicast_leave_group(struct net_brid
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for (p = mlock_dereference(mp->ports, br);
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p != NULL;
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p = mlock_dereference(p->next, br)) {
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- if (p->port != port)
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+ if (!br_port_group_equal(p, port, src))
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continue;
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if (!hlist_unhashed(&p->mglist) &&
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@@ -1564,7 +1602,8 @@ out:
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static void br_ip4_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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__be32 group,
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- __u16 vid)
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+ __u16 vid,
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+ const unsigned char *src)
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{
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struct br_ip br_group;
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struct bridge_mcast_own_query *own_query;
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@@ -1579,14 +1618,15 @@ static void br_ip4_multicast_leave_group
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br_group.vid = vid;
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br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
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- own_query);
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+ own_query, src);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static void br_ip6_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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const struct in6_addr *group,
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- __u16 vid)
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+ __u16 vid,
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+ const unsigned char *src)
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{
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struct br_ip br_group;
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struct bridge_mcast_own_query *own_query;
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@@ -1601,7 +1641,7 @@ static void br_ip6_multicast_leave_group
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br_group.vid = vid;
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br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
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- own_query);
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+ own_query, src);
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}
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#endif
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@@ -1644,6 +1684,7 @@ static int br_multicast_ipv4_rcv(struct
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u16 vid)
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{
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struct sk_buff *skb_trimmed = NULL;
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+ const unsigned char *src;
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struct igmphdr *ih;
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int err;
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@@ -1659,13 +1700,14 @@ static int br_multicast_ipv4_rcv(struct
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}
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ih = igmp_hdr(skb);
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+ src = eth_hdr(skb)->h_source;
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BR_INPUT_SKB_CB(skb)->igmp = ih->type;
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switch (ih->type) {
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case IGMP_HOST_MEMBERSHIP_REPORT:
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case IGMPV2_HOST_MEMBERSHIP_REPORT:
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BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
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- err = br_ip4_multicast_add_group(br, port, ih->group, vid);
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+ err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
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break;
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case IGMPV3_HOST_MEMBERSHIP_REPORT:
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err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
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@@ -1674,7 +1716,7 @@ static int br_multicast_ipv4_rcv(struct
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err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
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break;
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case IGMP_HOST_LEAVE_MESSAGE:
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- br_ip4_multicast_leave_group(br, port, ih->group, vid);
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+ br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
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break;
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}
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@@ -1694,6 +1736,7 @@ static int br_multicast_ipv6_rcv(struct
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u16 vid)
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{
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struct sk_buff *skb_trimmed = NULL;
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+ const unsigned char *src;
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struct mld_msg *mld;
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int err;
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@@ -1713,8 +1756,10 @@ static int br_multicast_ipv6_rcv(struct
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switch (mld->mld_type) {
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case ICMPV6_MGM_REPORT:
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+ src = eth_hdr(skb)->h_source;
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BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
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- err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
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+ err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
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+ src);
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break;
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case ICMPV6_MLD2_REPORT:
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err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
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@@ -1723,7 +1768,8 @@ static int br_multicast_ipv6_rcv(struct
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err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
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break;
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case ICMPV6_MGM_REDUCTION:
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- br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
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+ src = eth_hdr(skb)->h_source;
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+ br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
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break;
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}
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--- a/net/bridge/br_netlink.c
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+++ b/net/bridge/br_netlink.c
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@@ -123,6 +123,7 @@ static inline size_t br_port_info_size(v
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+ nla_total_size(1) /* IFLA_BRPORT_GUARD */
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+ nla_total_size(1) /* IFLA_BRPORT_PROTECT */
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+ nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
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+ + nla_total_size(1) /* IFLA_BRPORT_MCAST_TO_UCAST */
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+ nla_total_size(1) /* IFLA_BRPORT_LEARNING */
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+ nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
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+ nla_total_size(1) /* IFLA_BRPORT_PROXYARP */
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@@ -173,6 +174,8 @@ static int br_port_fill_attrs(struct sk_
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!!(p->flags & BR_ROOT_BLOCK)) ||
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nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE,
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!!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
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+ nla_put_u8(skb, IFLA_BRPORT_MCAST_TO_UCAST,
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+ !!(p->flags & BR_MULTICAST_TO_UNICAST)) ||
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nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
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nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD,
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!!(p->flags & BR_FLOOD)) ||
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@@ -586,6 +589,7 @@ static const struct nla_policy br_port_p
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[IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 },
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[IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 },
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[IFLA_BRPORT_MULTICAST_ROUTER] = { .type = NLA_U8 },
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+ [IFLA_BRPORT_MCAST_TO_UCAST] = { .type = NLA_U8 },
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};
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|
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/* Change the state of the port and notify spanning tree */
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@@ -636,6 +640,7 @@ static int br_setport(struct net_bridge_
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br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
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br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
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br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
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+ br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST, BR_MULTICAST_TO_UNICAST);
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br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
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br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
|
|
|
|
--- a/net/bridge/br_private.h
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+++ b/net/bridge/br_private.h
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|
@@ -166,8 +166,9 @@ struct net_bridge_fdb_entry
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|
struct rcu_head rcu;
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|
};
|
|
|
|
-#define MDB_PG_FLAGS_PERMANENT BIT(0)
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|
-#define MDB_PG_FLAGS_OFFLOAD BIT(1)
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|
+#define MDB_PG_FLAGS_PERMANENT BIT(0)
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+#define MDB_PG_FLAGS_OFFLOAD BIT(1)
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|
+#define MDB_PG_FLAGS_MCAST_TO_UCAST BIT(2)
|
|
|
|
struct net_bridge_port_group {
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|
struct net_bridge_port *port;
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|
@@ -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 *
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|
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,
|