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Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_device.c3
-rw-r--r--net/bridge/br_input.c2
-rw-r--r--net/bridge/br_mdb.c184
-rw-r--r--net/bridge/br_multicast.c5
-rw-r--r--net/bridge/br_private.h19
-rw-r--r--net/core/rtnetlink.c89
6 files changed, 285 insertions, 17 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 9a5ea06236bd..8f40de3af154 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -92,7 +92,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
goto out;
}
- mdst = br_mdb_get(brmctx, skb, vid);
+ mdst = br_mdb_entry_skb_get(brmctx, skb, vid);
if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
br_multicast_flood(mdst, skb, brmctx, false, true);
@@ -472,6 +472,7 @@ static const struct net_device_ops br_netdev_ops = {
.ndo_mdb_add = br_mdb_add,
.ndo_mdb_del = br_mdb_del,
.ndo_mdb_dump = br_mdb_dump,
+ .ndo_mdb_get = br_mdb_get,
.ndo_bridge_getlink = br_getlink,
.ndo_bridge_setlink = br_setlink,
.ndo_bridge_dellink = br_dellink,
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index c729528b5e85..f21097e73482 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -175,7 +175,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
switch (pkt_type) {
case BR_PKT_MULTICAST:
- mdst = br_mdb_get(brmctx, skb, vid);
+ mdst = br_mdb_entry_skb_get(brmctx, skb, vid);
if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst)) {
if ((mdst && mdst->host_joined) ||
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 7305f5f8215c..8cc526067bc2 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -323,9 +323,6 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
struct net_bridge_mdb_entry *mp;
struct nlattr *nest, *nest2;
- if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
- return 0;
-
nest = nla_nest_start_noflag(skb, MDBA_MDB);
if (nest == NULL)
return -EMSGSIZE;
@@ -453,13 +450,15 @@ cancel:
return -EMSGSIZE;
}
-static size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg)
+static size_t rtnl_mdb_nlmsg_pg_size(const struct net_bridge_port_group *pg)
{
- size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
- nla_total_size(sizeof(struct br_mdb_entry)) +
- nla_total_size(sizeof(u32));
struct net_bridge_group_src *ent;
- size_t addr_size = 0;
+ size_t nlmsg_size, addr_size = 0;
+
+ /* MDBA_MDB_ENTRY_INFO */
+ nlmsg_size = nla_total_size(sizeof(struct br_mdb_entry)) +
+ /* MDBA_MDB_EATTR_TIMER */
+ nla_total_size(sizeof(u32));
if (!pg)
goto out;
@@ -507,6 +506,17 @@ out:
return nlmsg_size;
}
+static size_t rtnl_mdb_nlmsg_size(const struct net_bridge_port_group *pg)
+{
+ return NLMSG_ALIGN(sizeof(struct br_port_msg)) +
+ /* MDBA_MDB */
+ nla_total_size(0) +
+ /* MDBA_MDB_ENTRY */
+ nla_total_size(0) +
+ /* Port group entry */
+ rtnl_mdb_nlmsg_pg_size(pg);
+}
+
void br_mdb_notify(struct net_device *dev,
struct net_bridge_mdb_entry *mp,
struct net_bridge_port_group *pg,
@@ -1401,3 +1411,161 @@ int br_mdb_del(struct net_device *dev, struct nlattr *tb[],
br_mdb_config_fini(&cfg);
return err;
}
+
+static const struct nla_policy br_mdbe_attrs_get_pol[MDBE_ATTR_MAX + 1] = {
+ [MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
+ sizeof(struct in_addr),
+ sizeof(struct in6_addr)),
+};
+
+static int br_mdb_get_parse(struct net_device *dev, struct nlattr *tb[],
+ struct br_ip *group, struct netlink_ext_ack *extack)
+{
+ struct br_mdb_entry *entry = nla_data(tb[MDBA_GET_ENTRY]);
+ struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
+ int err;
+
+ if (!tb[MDBA_GET_ENTRY_ATTRS]) {
+ __mdb_entry_to_br_ip(entry, group, NULL);
+ return 0;
+ }
+
+ err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
+ tb[MDBA_GET_ENTRY_ATTRS], br_mdbe_attrs_get_pol,
+ extack);
+ if (err)
+ return err;
+
+ if (mdbe_attrs[MDBE_ATTR_SOURCE] &&
+ !is_valid_mdb_source(mdbe_attrs[MDBE_ATTR_SOURCE],
+ entry->addr.proto, extack))
+ return -EINVAL;
+
+ __mdb_entry_to_br_ip(entry, group, mdbe_attrs);
+
+ return 0;
+}
+
+static struct sk_buff *
+br_mdb_get_reply_alloc(const struct net_bridge_mdb_entry *mp)
+{
+ struct net_bridge_port_group *pg;
+ size_t nlmsg_size;
+
+ nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
+ /* MDBA_MDB */
+ nla_total_size(0) +
+ /* MDBA_MDB_ENTRY */
+ nla_total_size(0);
+
+ if (mp->host_joined)
+ nlmsg_size += rtnl_mdb_nlmsg_pg_size(NULL);
+
+ for (pg = mlock_dereference(mp->ports, mp->br); pg;
+ pg = mlock_dereference(pg->next, mp->br))
+ nlmsg_size += rtnl_mdb_nlmsg_pg_size(pg);
+
+ return nlmsg_new(nlmsg_size, GFP_ATOMIC);
+}
+
+static int br_mdb_get_reply_fill(struct sk_buff *skb,
+ struct net_bridge_mdb_entry *mp, u32 portid,
+ u32 seq)
+{
+ struct nlattr *mdb_nest, *mdb_entry_nest;
+ struct net_bridge_port_group *pg;
+ struct br_port_msg *bpm;
+ struct nlmsghdr *nlh;
+ int err;
+
+ nlh = nlmsg_put(skb, portid, seq, RTM_NEWMDB, sizeof(*bpm), 0);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ bpm = nlmsg_data(nlh);
+ memset(bpm, 0, sizeof(*bpm));
+ bpm->family = AF_BRIDGE;
+ bpm->ifindex = mp->br->dev->ifindex;
+ mdb_nest = nla_nest_start_noflag(skb, MDBA_MDB);
+ if (!mdb_nest) {
+ err = -EMSGSIZE;
+ goto cancel;
+ }
+ mdb_entry_nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
+ if (!mdb_entry_nest) {
+ err = -EMSGSIZE;
+ goto cancel;
+ }
+
+ if (mp->host_joined) {
+ err = __mdb_fill_info(skb, mp, NULL);
+ if (err)
+ goto cancel;
+ }
+
+ for (pg = mlock_dereference(mp->ports, mp->br); pg;
+ pg = mlock_dereference(pg->next, mp->br)) {
+ err = __mdb_fill_info(skb, mp, pg);
+ if (err)
+ goto cancel;
+ }
+
+ nla_nest_end(skb, mdb_entry_nest);
+ nla_nest_end(skb, mdb_nest);
+ nlmsg_end(skb, nlh);
+
+ return 0;
+
+cancel:
+ nlmsg_cancel(skb, nlh);
+ return err;
+}
+
+int br_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid, u32 seq,
+ struct netlink_ext_ack *extack)
+{
+ struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_mdb_entry *mp;
+ struct sk_buff *skb;
+ struct br_ip group;
+ int err;
+
+ err = br_mdb_get_parse(dev, tb, &group, extack);
+ if (err)
+ return err;
+
+ /* Hold the multicast lock to ensure that the MDB entry does not change
+ * between the time the reply size is determined and when the reply is
+ * filled in.
+ */
+ spin_lock_bh(&br->multicast_lock);
+
+ mp = br_mdb_ip_get(br, &group);
+ if (!mp) {
+ NL_SET_ERR_MSG_MOD(extack, "MDB entry not found");
+ err = -ENOENT;
+ goto unlock;
+ }
+
+ skb = br_mdb_get_reply_alloc(mp);
+ if (!skb) {
+ err = -ENOMEM;
+ goto unlock;
+ }
+
+ err = br_mdb_get_reply_fill(skb, mp, portid, seq);
+ if (err) {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to fill MDB get reply");
+ goto free;
+ }
+
+ spin_unlock_bh(&br->multicast_lock);
+
+ return rtnl_unicast(skb, dev_net(dev), portid);
+
+free:
+ kfree_skb(skb);
+unlock:
+ spin_unlock_bh(&br->multicast_lock);
+ return err;
+}
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 96d1fc78dd39..d7d021af1029 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -145,8 +145,9 @@ static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
}
#endif
-struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge_mcast *brmctx,
- struct sk_buff *skb, u16 vid)
+struct net_bridge_mdb_entry *
+br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb,
+ u16 vid)
{
struct net_bridge *br = brmctx->br;
struct br_ip ip;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 27a7a06660f3..6b7f36769d03 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -955,8 +955,9 @@ int br_multicast_rcv(struct net_bridge_mcast **brmctx,
struct net_bridge_mcast_port **pmctx,
struct net_bridge_vlan *vlan,
struct sk_buff *skb, u16 vid);
-struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge_mcast *brmctx,
- struct sk_buff *skb, u16 vid);
+struct net_bridge_mdb_entry *
+br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb,
+ u16 vid);
int br_multicast_add_port(struct net_bridge_port *port);
void br_multicast_del_port(struct net_bridge_port *port);
void br_multicast_enable_port(struct net_bridge_port *port);
@@ -1021,6 +1022,8 @@ int br_mdb_del(struct net_device *dev, struct nlattr *tb[],
struct netlink_ext_ack *extack);
int br_mdb_dump(struct net_device *dev, struct sk_buff *skb,
struct netlink_callback *cb);
+int br_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid, u32 seq,
+ struct netlink_ext_ack *extack);
void br_multicast_host_join(const struct net_bridge_mcast *brmctx,
struct net_bridge_mdb_entry *mp, bool notify);
void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
@@ -1345,8 +1348,9 @@ static inline int br_multicast_rcv(struct net_bridge_mcast **brmctx,
return 0;
}
-static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge_mcast *brmctx,
- struct sk_buff *skb, u16 vid)
+static inline struct net_bridge_mdb_entry *
+br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb,
+ u16 vid)
{
return NULL;
}
@@ -1430,6 +1434,13 @@ static inline int br_mdb_dump(struct net_device *dev, struct sk_buff *skb,
return 0;
}
+static inline int br_mdb_get(struct net_device *dev, struct nlattr *tb[],
+ u32 portid, u32 seq,
+ struct netlink_ext_ack *extack)
+{
+ return -EOPNOTSUPP;
+}
+
static inline int br_mdb_hash_init(struct net_bridge *br)
{
return 0;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index f2753fd58881..e8431c6c8490 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -6219,6 +6219,93 @@ out:
return skb->len;
}
+static int rtnl_validate_mdb_entry_get(const struct nlattr *attr,
+ struct netlink_ext_ack *extack)
+{
+ struct br_mdb_entry *entry = nla_data(attr);
+
+ if (nla_len(attr) != sizeof(struct br_mdb_entry)) {
+ NL_SET_ERR_MSG_ATTR(extack, attr, "Invalid attribute length");
+ return -EINVAL;
+ }
+
+ if (entry->ifindex) {
+ NL_SET_ERR_MSG(extack, "Entry ifindex cannot be specified");
+ return -EINVAL;
+ }
+
+ if (entry->state) {
+ NL_SET_ERR_MSG(extack, "Entry state cannot be specified");
+ return -EINVAL;
+ }
+
+ if (entry->flags) {
+ NL_SET_ERR_MSG(extack, "Entry flags cannot be specified");
+ return -EINVAL;
+ }
+
+ if (entry->vid >= VLAN_VID_MASK) {
+ NL_SET_ERR_MSG(extack, "Invalid entry VLAN id");
+ return -EINVAL;
+ }
+
+ if (entry->addr.proto != htons(ETH_P_IP) &&
+ entry->addr.proto != htons(ETH_P_IPV6) &&
+ entry->addr.proto != 0) {
+ NL_SET_ERR_MSG(extack, "Unknown entry protocol");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct nla_policy mdba_get_policy[MDBA_GET_ENTRY_MAX + 1] = {
+ [MDBA_GET_ENTRY] = NLA_POLICY_VALIDATE_FN(NLA_BINARY,
+ rtnl_validate_mdb_entry_get,
+ sizeof(struct br_mdb_entry)),
+ [MDBA_GET_ENTRY_ATTRS] = { .type = NLA_NESTED },
+};
+
+static int rtnl_mdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[MDBA_GET_ENTRY_MAX + 1];
+ struct net *net = sock_net(in_skb->sk);
+ struct br_port_msg *bpm;
+ struct net_device *dev;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(struct br_port_msg), tb,
+ MDBA_GET_ENTRY_MAX, mdba_get_policy, extack);
+ if (err)
+ return err;
+
+ bpm = nlmsg_data(nlh);
+ if (!bpm->ifindex) {
+ NL_SET_ERR_MSG(extack, "Invalid ifindex");
+ return -EINVAL;
+ }
+
+ dev = __dev_get_by_index(net, bpm->ifindex);
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Device doesn't exist");
+ return -ENODEV;
+ }
+
+ if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_GET_ENTRY)) {
+ NL_SET_ERR_MSG(extack, "Missing MDBA_GET_ENTRY attribute");
+ return -EINVAL;
+ }
+
+ if (!dev->netdev_ops->ndo_mdb_get) {
+ NL_SET_ERR_MSG(extack, "Device does not support MDB operations");
+ return -EOPNOTSUPP;
+ }
+
+ return dev->netdev_ops->ndo_mdb_get(dev, tb, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, extack);
+}
+
static int rtnl_validate_mdb_entry(const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
@@ -6595,7 +6682,7 @@ void __init rtnetlink_init(void)
0);
rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
- rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, rtnl_mdb_dump, 0);
+ rtnl_register(PF_BRIDGE, RTM_GETMDB, rtnl_mdb_get, rtnl_mdb_dump, 0);
rtnl_register(PF_BRIDGE, RTM_NEWMDB, rtnl_mdb_add, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_DELMDB, rtnl_mdb_del, NULL, 0);
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-21 14:46:49 +0000