Support per port group src list (address and timer) and filter mode
dumping. Protected by either multicast_lock or rcu.
v3: add IPv6 support
v2: require RCU or multicast_lock to traverse src groups
Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
---
include/uapi/linux/if_bridge.h | 21 +++++++++
net/bridge/br_mdb.c | 85 +++++++++++++++++++++++++++++++++-
2 files changed, 104 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index c1227aecd38f..75a2ac479247 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -455,10 +455,31 @@ enum {
enum {
MDBA_MDB_EATTR_UNSPEC,
MDBA_MDB_EATTR_TIMER,
+ MDBA_MDB_EATTR_SRC_LIST,
+ MDBA_MDB_EATTR_GROUP_MODE,
__MDBA_MDB_EATTR_MAX
};
#define MDBA_MDB_EATTR_MAX (__MDBA_MDB_EATTR_MAX - 1)
+/* per mdb entry source */
+enum {
+ MDBA_MDB_SRCLIST_UNSPEC,
+ MDBA_MDB_SRCLIST_ENTRY,
+ __MDBA_MDB_SRCLIST_MAX
+};
+#define MDBA_MDB_SRCLIST_MAX (__MDBA_MDB_SRCLIST_MAX - 1)
+
+/* per mdb entry per source attributes
+ * these are embedded in MDBA_MDB_SRCLIST_ENTRY
+ */
+enum {
+ MDBA_MDB_SRCATTR_UNSPEC,
+ MDBA_MDB_SRCATTR_ADDRESS,
+ MDBA_MDB_SRCATTR_TIMER,
+ __MDBA_MDB_SRCATTR_MAX
+};
+#define MDBA_MDB_SRCATTR_MAX (__MDBA_MDB_SRCATTR_MAX - 1)
+
/* multicast router types */
enum {
MDB_RTR_TYPE_DISABLED,
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 559bdc256a1e..9dc12ce61018 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -77,10 +77,67 @@ static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
#endif
}
+static int __mdb_fill_srcs(struct sk_buff *skb,
+ struct net_bridge_port_group *p)
+{
+ struct net_bridge_group_src *ent;
+ struct nlattr *nest, *nest_ent;
+
+ if (hlist_empty(&p->src_list))
+ return 0;
+
+ nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST);
+ if (!nest)
+ return -EMSGSIZE;
+
+ hlist_for_each_entry_rcu(ent, &p->src_list, node,
+ lockdep_is_held(&p->port->br->multicast_lock)) {
+ nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY);
+ if (!nest_ent)
+ goto out_cancel_err;
+ switch (ent->addr.proto) {
+ case htons(ETH_P_IP):
+ if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
+ ent->addr.u.ip4)) {
+ nla_nest_cancel(skb, nest_ent);
+ goto out_cancel_err;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
+ &ent->addr.u.ip6)) {
+ nla_nest_cancel(skb, nest_ent);
+ goto out_cancel_err;
+ }
+ break;
+#endif
+ default:
+ nla_nest_cancel(skb, nest_ent);
+ continue;
+ }
+ if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER,
+ br_timer_value(&ent->timer))) {
+ nla_nest_cancel(skb, nest_ent);
+ goto out_cancel_err;
+ }
+ nla_nest_end(skb, nest_ent);
+ }
+
+ nla_nest_end(skb, nest);
+
+ return 0;
+
+out_cancel_err:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
static int __mdb_fill_info(struct sk_buff *skb,
struct net_bridge_mdb_entry *mp,
struct net_bridge_port_group *p)
{
+ bool dump_srcs_mode = false;
struct timer_list *mtimer;
struct nlattr *nest_ent;
struct br_mdb_entry e;
@@ -119,6 +176,23 @@ static int __mdb_fill_info(struct sk_buff *skb,
nla_nest_cancel(skb, nest_ent);
return -EMSGSIZE;
}
+ switch (mp->addr.proto) {
+ case htons(ETH_P_IP):
+ dump_srcs_mode = !!(p && mp->br->multicast_igmp_version == 3);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ dump_srcs_mode = !!(p && mp->br->multicast_mld_version == 2);
+ break;
+#endif
+ }
+ if (dump_srcs_mode &&
+ (__mdb_fill_srcs(skb, p) ||
+ nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE, p->filter_mode))) {
+ nla_nest_cancel(skb, nest_ent);
+ return -EMSGSIZE;
+ }
+
nla_nest_end(skb, nest_ent);
return 0;
@@ -127,7 +201,7 @@ static int __mdb_fill_info(struct sk_buff *skb,
static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev)
{
- int idx = 0, s_idx = cb->args[1], err = 0;
+ int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2];
struct net_bridge *br = netdev_priv(dev);
struct net_bridge_mdb_entry *mp;
struct nlattr *nest, *nest2;
@@ -152,7 +226,7 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
break;
}
- if (mp->host_joined) {
+ if (!s_pidx && mp->host_joined) {
err = __mdb_fill_info(skb, mp, NULL);
if (err) {
nla_nest_cancel(skb, nest2);
@@ -164,13 +238,19 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
pp = &p->next) {
if (!p->port)
continue;
+ if (pidx < s_pidx)
+ goto skip_pg;
err = __mdb_fill_info(skb, mp, p);
if (err) {
nla_nest_cancel(skb, nest2);
goto out;
}
+skip_pg:
+ pidx++;
}
+ pidx = 0;
+ s_pidx = 0;
nla_nest_end(skb, nest2);
skip:
idx++;
@@ -178,6 +258,7 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
out:
cb->args[1] = idx;
+ cb->args[2] = pidx;
nla_nest_end(skb, nest);
return err;
}
--
2.25.4
