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Message-Id: <20221210145633.1328511-12-idosch@nvidia.com>
Date: Sat, 10 Dec 2022 16:56:30 +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 v2 11/14] bridge: mcast: Allow user space to specify MDB entry routing protocol
Add the 'MDBE_ATTR_RTPORT' attribute to allow user space to specify the
routing protocol of the MDB port group entry. Enforce a minimum value of
'RTPROT_STATIC' to prevent user space from using protocol values that
should only be set by the kernel (e.g., 'RTPROT_KERNEL'). Maintain
backward compatibility by defaulting to 'RTPROT_STATIC'.
The protocol is already visible to user space in RTM_NEWMDB responses
and notifications via the 'MDBA_MDB_EATTR_RTPROT' attribute.
The routing protocol allows a routing daemon to distinguish between
entries configured by it and those configured by the administrator. Once
MDB flush is supported, the protocol can be used as a criterion
according to which the flush is performed.
Examples:
# bridge mdb add dev br0 port dummy10 grp 239.1.1.1 permanent proto kernel
Error: integer out of range.
# bridge mdb add dev br0 port dummy10 grp 239.1.1.1 permanent proto static
# bridge mdb add dev br0 port dummy10 grp 239.1.1.1 src 192.0.2.1 permanent proto zebra
# bridge mdb add dev br0 port dummy10 grp 239.1.1.2 permanent source_list 198.51.100.1,198.51.100.2 filter_mode include proto 250
# bridge -d mdb show
dev br0 port dummy10 grp 239.1.1.2 src 198.51.100.2 permanent filter_mode include proto 250
dev br0 port dummy10 grp 239.1.1.2 src 198.51.100.1 permanent filter_mode include proto 250
dev br0 port dummy10 grp 239.1.1.2 permanent filter_mode include source_list 198.51.100.2/0.00,198.51.100.1/0.00 proto 250
dev br0 port dummy10 grp 239.1.1.1 src 192.0.2.1 permanent filter_mode include proto zebra
dev br0 port dummy10 grp 239.1.1.1 permanent filter_mode exclude proto static
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>
---
Notes:
v1:
* Reject protocol for host entries.
include/uapi/linux/if_bridge.h | 1 +
net/bridge/br_mdb.c | 15 +++++++++++++--
net/bridge/br_private.h | 1 +
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 0d9fe73fc48c..d9de241d90f9 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -725,6 +725,7 @@ enum {
MDBE_ATTR_SOURCE,
MDBE_ATTR_SRC_LIST,
MDBE_ATTR_GROUP_MODE,
+ MDBE_ATTR_RTPROT,
__MDBE_ATTR_MAX,
};
#define MDBE_ATTR_MAX (__MDBE_ATTR_MAX - 1)
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 61d46b0a31b6..72d4e53193e5 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -682,6 +682,7 @@ static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
[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),
+ [MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
};
static bool is_valid_mdb_entry(struct br_mdb_entry *entry,
@@ -823,7 +824,7 @@ static int br_mdb_add_group_sg(const struct br_mdb_config *cfg,
}
p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
- MCAST_INCLUDE, RTPROT_STATIC);
+ MCAST_INCLUDE, cfg->rt_protocol);
if (unlikely(!p)) {
NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new (S, G) port group");
return -ENOMEM;
@@ -881,6 +882,7 @@ static int br_mdb_add_group_src_fwd(const struct br_mdb_config *cfg,
sg_cfg.group = sg_ip;
sg_cfg.src_entry = true;
sg_cfg.filter_mode = MCAST_INCLUDE;
+ sg_cfg.rt_protocol = cfg->rt_protocol;
return br_mdb_add_group_sg(&sg_cfg, sgmp, brmctx, flags, extack);
}
@@ -982,7 +984,7 @@ static int br_mdb_add_group_star_g(const struct br_mdb_config *cfg,
}
p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
- cfg->filter_mode, RTPROT_STATIC);
+ cfg->filter_mode, cfg->rt_protocol);
if (unlikely(!p)) {
NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new (*, G) port group");
return -ENOMEM;
@@ -1193,6 +1195,14 @@ static int br_mdb_config_attrs_init(struct nlattr *set_attrs,
return -EINVAL;
}
+ if (mdb_attrs[MDBE_ATTR_RTPROT]) {
+ if (!cfg->p) {
+ NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be set for host groups");
+ return -EINVAL;
+ }
+ cfg->rt_protocol = nla_get_u8(mdb_attrs[MDBE_ATTR_RTPROT]);
+ }
+
return 0;
}
@@ -1212,6 +1222,7 @@ static int br_mdb_config_init(struct net *net, const struct nlmsghdr *nlh,
memset(cfg, 0, sizeof(*cfg));
cfg->filter_mode = MCAST_EXCLUDE;
+ cfg->rt_protocol = RTPROT_STATIC;
bpm = nlmsg_data(nlh);
if (!bpm->ifindex) {
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 368f5f6fa42b..cdc9e040f1f6 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -106,6 +106,7 @@ struct br_mdb_config {
u8 filter_mode;
struct br_mdb_src_entry *src_entries;
int num_src_entries;
+ u8 rt_protocol;
};
#endif
--
2.37.3
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