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Message-Id: <20221208152839.1016350-11-idosch@nvidia.com>
Date: Thu, 8 Dec 2022 17:28:35 +0200
From: Ido Schimmel <idosch@...dia.com>
To: netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
edumazet@...gle.com, roopa@...dia.com, razor@...ckwall.org,
mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 10/14] bridge: mcast: Allow user space to add (*, G) with a source list and filter mode
Add new netlink attributes to the RTM_NEWMDB request that allow user
space to add (*, G) with a source list and filter mode.
The RTM_NEWMDB message can already dump such entries (created by the
kernel) so there is no need to add dump support. However, the message
contains a different set of attributes depending if it is a request or a
response. The naming and structure of the new attributes try to follow
the existing ones used in the response.
Request:
[ struct nlmsghdr ]
[ struct br_port_msg ]
[ MDBA_SET_ENTRY ]
struct br_mdb_entry
[ MDBA_SET_ENTRY_ATTRS ]
[ MDBE_ATTR_SOURCE ]
struct in_addr / struct in6_addr
[ MDBE_ATTR_SRC_LIST ] // new
[ MDBE_SRC_LIST_ENTRY ]
[ MDBE_SRCATTR_ADDRESS ]
struct in_addr / struct in6_addr
[ ...]
[ MDBE_ATTR_GROUP_MODE ] // new
u8
Response:
[ struct nlmsghdr ]
[ struct br_port_msg ]
[ MDBA_MDB ]
[ MDBA_MDB_ENTRY ]
[ MDBA_MDB_ENTRY_INFO ]
struct br_mdb_entry
[ MDBA_MDB_EATTR_TIMER ]
u32
[ MDBA_MDB_EATTR_SOURCE ]
struct in_addr / struct in6_addr
[ MDBA_MDB_EATTR_RTPROT ]
u8
[ MDBA_MDB_EATTR_SRC_LIST ]
[ MDBA_MDB_SRCLIST_ENTRY ]
[ MDBA_MDB_SRCATTR_ADDRESS ]
struct in_addr / struct in6_addr
[ MDBA_MDB_SRCATTR_TIMER ]
u8
[...]
[ MDBA_MDB_EATTR_GROUP_MODE ]
u8
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
Notes:
v1:
* Use an array instead of list to store source entries.
* Drop br_mdb_config_attrs_fini().
include/uapi/linux/if_bridge.h | 20 +++++
net/bridge/br_mdb.c | 130 +++++++++++++++++++++++++++++++++
2 files changed, 150 insertions(+)
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index a86a7e7b811f..0d9fe73fc48c 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -723,10 +723,30 @@ enum {
enum {
MDBE_ATTR_UNSPEC,
MDBE_ATTR_SOURCE,
+ MDBE_ATTR_SRC_LIST,
+ MDBE_ATTR_GROUP_MODE,
__MDBE_ATTR_MAX,
};
#define MDBE_ATTR_MAX (__MDBE_ATTR_MAX - 1)
+/* per mdb entry source */
+enum {
+ MDBE_SRC_LIST_UNSPEC,
+ MDBE_SRC_LIST_ENTRY,
+ __MDBE_SRC_LIST_MAX,
+};
+#define MDBE_SRC_LIST_MAX (__MDBE_SRC_LIST_MAX - 1)
+
+/* per mdb entry per source attributes
+ * these are embedded in MDBE_SRC_LIST_ENTRY
+ */
+enum {
+ MDBE_SRCATTR_UNSPEC,
+ MDBE_SRCATTR_ADDRESS,
+ __MDBE_SRCATTR_MAX,
+};
+#define MDBE_SRCATTR_MAX (__MDBE_SRCATTR_MAX - 1)
+
/* Embedded inside LINK_XSTATS_TYPE_BRIDGE */
enum {
BRIDGE_XSTATS_UNSPEC,
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index e9a4b7e247e7..61d46b0a31b6 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -663,10 +663,25 @@ void br_rtr_notify(struct net_device *dev, struct net_bridge_mcast_port *pmctx,
rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}
+static const struct nla_policy
+br_mdbe_src_list_entry_pol[MDBE_SRCATTR_MAX + 1] = {
+ [MDBE_SRCATTR_ADDRESS] = NLA_POLICY_RANGE(NLA_BINARY,
+ sizeof(struct in_addr),
+ sizeof(struct in6_addr)),
+};
+
+static const struct nla_policy
+br_mdbe_src_list_pol[MDBE_SRC_LIST_MAX + 1] = {
+ [MDBE_SRC_LIST_ENTRY] = NLA_POLICY_NESTED(br_mdbe_src_list_entry_pol),
+};
+
static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
[MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
+ [MDBE_ATTR_GROUP_MODE] = NLA_POLICY_RANGE(NLA_U8, MCAST_EXCLUDE,
+ MCAST_INCLUDE),
+ [MDBE_ATTR_SRC_LIST] = NLA_POLICY_NESTED(br_mdbe_src_list_pol),
};
static bool is_valid_mdb_entry(struct br_mdb_entry *entry,
@@ -1051,6 +1066,76 @@ static int __br_mdb_add(const struct br_mdb_config *cfg,
return ret;
}
+static int br_mdb_config_src_entry_init(struct nlattr *src_entry,
+ struct br_mdb_src_entry *src,
+ __be16 proto,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[MDBE_SRCATTR_MAX + 1];
+ int err;
+
+ err = nla_parse_nested(tb, MDBE_SRCATTR_MAX, src_entry,
+ br_mdbe_src_list_entry_pol, extack);
+ if (err)
+ return err;
+
+ if (NL_REQ_ATTR_CHECK(extack, src_entry, tb, MDBE_SRCATTR_ADDRESS))
+ return -EINVAL;
+
+ if (!is_valid_mdb_source(tb[MDBE_SRCATTR_ADDRESS], proto, extack))
+ return -EINVAL;
+
+ src->addr.proto = proto;
+ nla_memcpy(&src->addr.src, tb[MDBE_SRCATTR_ADDRESS],
+ nla_len(tb[MDBE_SRCATTR_ADDRESS]));
+
+ return 0;
+}
+
+static int br_mdb_config_src_list_init(struct nlattr *src_list,
+ struct br_mdb_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *src_entry;
+ int rem, err;
+ int i = 0;
+
+ nla_for_each_nested(src_entry, src_list, rem)
+ cfg->num_src_entries++;
+
+ if (cfg->num_src_entries >= PG_SRC_ENT_LIMIT) {
+ NL_SET_ERR_MSG_FMT_MOD(extack, "Exceeded maximum number of source entries (%u)",
+ PG_SRC_ENT_LIMIT - 1);
+ return -EINVAL;
+ }
+
+ cfg->src_entries = kcalloc(cfg->num_src_entries,
+ sizeof(struct br_mdb_src_entry), GFP_KERNEL);
+ if (!cfg->src_entries)
+ return -ENOMEM;
+
+ nla_for_each_nested(src_entry, src_list, rem) {
+ err = br_mdb_config_src_entry_init(src_entry,
+ &cfg->src_entries[i],
+ cfg->entry->addr.proto,
+ extack);
+ if (err)
+ goto err_src_entry_init;
+ i++;
+ }
+
+ return 0;
+
+err_src_entry_init:
+ kfree(cfg->src_entries);
+ return err;
+}
+
+static void br_mdb_config_src_list_fini(struct br_mdb_config *cfg)
+{
+ kfree(cfg->src_entries);
+}
+
static int br_mdb_config_attrs_init(struct nlattr *set_attrs,
struct br_mdb_config *cfg,
struct netlink_ext_ack *extack)
@@ -1070,6 +1155,44 @@ static int br_mdb_config_attrs_init(struct nlattr *set_attrs,
__mdb_entry_to_br_ip(cfg->entry, &cfg->group, mdb_attrs);
+ if (mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
+ if (!cfg->p) {
+ NL_SET_ERR_MSG_MOD(extack, "Filter mode cannot be set for host groups");
+ return -EINVAL;
+ }
+ if (!br_multicast_is_star_g(&cfg->group)) {
+ NL_SET_ERR_MSG_MOD(extack, "Filter mode can only be set for (*, G) entries");
+ return -EINVAL;
+ }
+ cfg->filter_mode = nla_get_u8(mdb_attrs[MDBE_ATTR_GROUP_MODE]);
+ } else {
+ cfg->filter_mode = MCAST_EXCLUDE;
+ }
+
+ if (mdb_attrs[MDBE_ATTR_SRC_LIST]) {
+ if (!cfg->p) {
+ NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set for host groups");
+ return -EINVAL;
+ }
+ if (!br_multicast_is_star_g(&cfg->group)) {
+ NL_SET_ERR_MSG_MOD(extack, "Source list can only be set for (*, G) entries");
+ return -EINVAL;
+ }
+ if (!mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
+ NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set without filter mode");
+ return -EINVAL;
+ }
+ err = br_mdb_config_src_list_init(mdb_attrs[MDBE_ATTR_SRC_LIST],
+ cfg, extack);
+ if (err)
+ return err;
+ }
+
+ if (!cfg->num_src_entries && cfg->filter_mode == MCAST_INCLUDE) {
+ NL_SET_ERR_MSG_MOD(extack, "Cannot add (*, G) INCLUDE with an empty source list");
+ return -EINVAL;
+ }
+
return 0;
}
@@ -1162,6 +1285,11 @@ static int br_mdb_config_init(struct net *net, const struct nlmsghdr *nlh,
return 0;
}
+static void br_mdb_config_fini(struct br_mdb_config *cfg)
+{
+ br_mdb_config_src_list_fini(cfg);
+}
+
static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@@ -1220,6 +1348,7 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
}
out:
+ br_mdb_config_fini(&cfg);
return err;
}
@@ -1295,6 +1424,7 @@ static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
err = __br_mdb_del(&cfg);
}
+ br_mdb_config_fini(&cfg);
return err;
}
--
2.37.3
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