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391 lines
11 KiB
Diff
391 lines
11 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Subject: [PATCH] bridge: multicast to unicast
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Implement optinal multicast->unicast conversion for igmp snooping
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---
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--- a/net/bridge/br_multicast.c
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+++ b/net/bridge/br_multicast.c
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@@ -635,7 +635,8 @@ 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 state)
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+ unsigned char state,
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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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@@ -650,12 +651,33 @@ 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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+ if ((port->flags & BR_MULTICAST_TO_UCAST) && src) {
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+ memcpy(p->eth_addr, src, ETH_ALEN);
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+ p->unicast = true;
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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->unicast)
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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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@@ -682,13 +704,13 @@ 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, MDB_TEMPORARY);
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+ p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY, 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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@@ -707,7 +729,7 @@ 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, const unsigned char *src)
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{
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struct br_ip br_group;
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@@ -718,14 +740,14 @@ 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, const unsigned char *src)
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{
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struct br_ip br_group;
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@@ -736,7 +758,7 @@ 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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@@ -965,6 +987,7 @@ 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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@@ -1008,7 +1031,8 @@ static int br_ip4_multicast_igmp3_report
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continue;
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}
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- err = br_ip4_multicast_add_group(br, port, group, vid);
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+ src = eth_hdr(skb)->h_source;
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+ err = br_ip4_multicast_add_group(br, port, group, vid, src);
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if (err)
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break;
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}
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@@ -1022,6 +1046,7 @@ 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;
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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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@@ -1069,8 +1094,9 @@ static int br_ip6_multicast_mld2_report(
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continue;
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}
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+ src = eth_hdr(skb)->h_source;
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err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
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- vid);
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+ vid, src);
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if (err)
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break;
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}
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@@ -1406,7 +1432,8 @@ 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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@@ -1456,7 +1483,7 @@ 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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@@ -1490,7 +1517,7 @@ 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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@@ -1508,8 +1535,8 @@ 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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+ __be32 group, __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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@@ -1524,14 +1551,14 @@ 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, 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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@@ -1546,7 +1573,7 @@ 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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@@ -1555,6 +1582,7 @@ static int br_multicast_ipv4_rcv(struct
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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 sk_buff *skb2 = skb;
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const struct iphdr *iph;
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struct igmphdr *ih;
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@@ -1628,7 +1656,8 @@ static int br_multicast_ipv4_rcv(struct
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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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+ src = eth_hdr(skb)->h_source;
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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, skb2, vid);
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@@ -1637,7 +1666,8 @@ static int br_multicast_ipv4_rcv(struct
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err = br_ip4_multicast_query(br, port, skb2, 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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+ src = eth_hdr(skb)->h_source;
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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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@@ -1655,6 +1685,7 @@ static int br_multicast_ipv6_rcv(struct
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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 sk_buff *skb2;
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const struct ipv6hdr *ip6h;
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u8 icmp6_type;
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@@ -1764,7 +1795,9 @@ static int br_multicast_ipv6_rcv(struct
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}
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mld = (struct mld_msg *)skb_transport_header(skb2);
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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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+ src = eth_hdr(skb)->h_source;
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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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}
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case ICMPV6_MLD2_REPORT:
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@@ -1781,7 +1814,8 @@ static int br_multicast_ipv6_rcv(struct
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goto out;
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}
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mld = (struct mld_msg *)skb_transport_header(skb2);
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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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}
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}
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--- a/net/bridge/br_private.h
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+++ b/net/bridge/br_private.h
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@@ -112,6 +112,9 @@ struct net_bridge_port_group {
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struct timer_list timer;
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struct br_ip addr;
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unsigned char state;
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+
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+ unsigned char eth_addr[ETH_ALEN];
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+ bool unicast;
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};
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struct net_bridge_mdb_entry
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@@ -173,6 +176,7 @@ struct net_bridge_port
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#define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
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#define BR_PROMISC 0x00000080
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#define BR_ISOLATE_MODE 0x00000100
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+#define BR_MULTICAST_TO_UCAST 0x00000200
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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struct bridge_mcast_own_query ip4_own_query;
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@@ -485,7 +489,8 @@ void br_multicast_free_pg(struct rcu_hea
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struct net_bridge_port_group *
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br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
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struct net_bridge_port_group __rcu *next,
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- unsigned char state);
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+ unsigned char state,
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+ const unsigned char *src);
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void br_mdb_init(void);
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void br_mdb_uninit(void);
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void br_mdb_notify(struct net_device *dev, struct net_bridge_port *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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@@ -342,7 +342,7 @@ 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_forward.c
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+++ b/net/bridge/br_forward.c
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@@ -168,6 +168,34 @@ out:
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return p;
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}
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+static struct net_bridge_port *maybe_deliver_addr(
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+ struct net_bridge_port *prev, struct net_bridge_port *p,
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+ struct sk_buff *skb, const unsigned char *addr,
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+ void (*__packet_hook)(const struct net_bridge_port *p,
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+ struct sk_buff *skb))
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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 prev;
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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 prev;
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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 prev;
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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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+ __packet_hook(p, skb);
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+
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+ return prev;
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+}
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+
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/* called under bridge lock */
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static void br_flood(struct net_bridge *br, struct sk_buff *skb,
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struct sk_buff *skb0,
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@@ -232,6 +260,7 @@ static void br_multicast_flood(struct ne
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struct net_bridge_port *prev = NULL;
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struct net_bridge_port_group *p;
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struct hlist_node *rp;
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+ const unsigned char *addr;
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rp = rcu_dereference(hlist_first_rcu(&br->router_list));
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p = mdst ? rcu_dereference(mdst->ports) : NULL;
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@@ -242,10 +271,19 @@ static void br_multicast_flood(struct ne
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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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-
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- prev = maybe_deliver(prev, port, skb, __packet_hook);
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+ if ((unsigned long)lport > (unsigned long)rport) {
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+ port = lport;
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+ addr = p->unicast ? p->eth_addr : NULL;
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+ } else {
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+ port = rport;
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+ addr = NULL;
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+ }
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+
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+ if (addr)
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+ prev = maybe_deliver_addr(prev, port, skb, addr,
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+ __packet_hook);
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+ else
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+ prev = maybe_deliver(prev, port, skb, __packet_hook);
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if (IS_ERR(prev))
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goto out;
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--- a/net/bridge/br_sysfs_if.c
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+++ b/net/bridge/br_sysfs_if.c
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@@ -202,6 +202,7 @@ static BRPORT_ATTR(multicast_router, S_I
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store_multicast_router);
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BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
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+BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UCAST);
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#endif
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static const struct brport_attribute *brport_attrs[] = {
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@@ -228,6 +229,7 @@ static const struct brport_attribute *br
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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&brport_attr_multicast_router,
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&brport_attr_multicast_fast_leave,
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+ &brport_attr_multicast_to_unicast,
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#endif
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&brport_attr_isolate_mode,
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NULL
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