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Message-ID: <9e3ae337dcf168c60c4cfd51aa0b2fc7b24bcbfb.camel@kernel.org>
Subject: Re: [PATCH v6 3/3] NFSD: add write_ports to netlink command
From: Jeff Layton <jlayton@kernel.org>
To: Lorenzo Bianconi <lorenzo@kernel.org>, linux-nfs@vger.kernel.org
Cc: lorenzo.bianconi@redhat.com, neilb@suse.de, kuba@kernel.org, 
	chuck.lever@oracle.com, horms@kernel.org, netdev@vger.kernel.org
Date: Mon, 22 Jan 2024 08:41:49 -0500
In-Reply-To: <f7c42dae2b232b3b06e54ceb3f00725893973e02.1705771400.git.lorenzo@kernel.org>
References: <cover.1705771400.git.lorenzo@kernel.org>
	 <f7c42dae2b232b3b06e54ceb3f00725893973e02.1705771400.git.lorenzo@kernel.org>
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On Sat, 2024-01-20 at 18:33 +0100, Lorenzo Bianconi wrote:
> Introduce write_ports netlink command. For listener-set, userspace is
> expected to provide a NFS listeners list it wants to enable (all the
> other ports will be closed).
>=20

Ditto here. This is a change to a declarative interface, which I think
is a better way to handle this, but we should be aware of the change.

> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
>  Documentation/netlink/specs/nfsd.yaml |  37 +++++
>  fs/nfsd/netlink.c                     |  23 +++
>  fs/nfsd/netlink.h                     |   3 +
>  fs/nfsd/nfsctl.c                      | 196 ++++++++++++++++++++++++++
>  include/uapi/linux/nfsd_netlink.h     |  18 +++
>  tools/net/ynl/generated/nfsd-user.c   | 191 +++++++++++++++++++++++++
>  tools/net/ynl/generated/nfsd-user.h   |  55 ++++++++
>  7 files changed, 523 insertions(+)
>=20
> diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlin=
k/specs/nfsd.yaml
> index 30f18798e84e..296ff24b23ac 100644
> --- a/Documentation/netlink/specs/nfsd.yaml
> +++ b/Documentation/netlink/specs/nfsd.yaml
> @@ -85,6 +85,26 @@ attribute-sets:
>          type: nest
>          nested-attributes: nfs-version
>          multi-attr: true
> +  -
> +    name: server-instance
> +    attributes:
> +      -
> +        name: transport-name
> +        type: string
> +      -
> +        name: port
> +        type: u32
> +      -
> +        name: inet-proto
> +        type: u16
> +  -
> +    name: server-listener
> +    attributes:
> +      -
> +        name: instance
> +        type: nest
> +        nested-attributes: server-instance
> +        multi-attr: true
> =20
>  operations:
>    list:
> @@ -144,3 +164,20 @@ operations:
>          reply:
>            attributes:
>              - version
> +    -
> +      name: listener-set
> +      doc: set nfs running listeners
> +      attribute-set: server-listener
> +      flags: [ admin-perm ]
> +      do:
> +        request:
> +          attributes:
> +            - instance
> +    -
> +      name: listener-get
> +      doc: get nfs running listeners
> +      attribute-set: server-listener
> +      do:
> +        reply:
> +          attributes:
> +            - instance
> diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c
> index 5cbbd3295543..c772f9e14761 100644
> --- a/fs/nfsd/netlink.c
> +++ b/fs/nfsd/netlink.c
> @@ -16,6 +16,12 @@ const struct nla_policy nfsd_nfs_version_nl_policy[NFS=
D_A_NFS_VERSION_MINOR + 1]
>  	[NFSD_A_NFS_VERSION_MINOR] =3D { .type =3D NLA_U32, },
>  };
> =20
> +const struct nla_policy nfsd_server_instance_nl_policy[NFSD_A_SERVER_INS=
TANCE_INET_PROTO + 1] =3D {
> +	[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME] =3D { .type =3D NLA_NUL_STRING,=
 },
> +	[NFSD_A_SERVER_INSTANCE_PORT] =3D { .type =3D NLA_U32, },
> +	[NFSD_A_SERVER_INSTANCE_INET_PROTO] =3D { .type =3D NLA_U16, },
> +};
> +
>  /* NFSD_CMD_THREADS_SET - do */
>  static const struct nla_policy nfsd_threads_set_nl_policy[NFSD_A_SERVER_=
WORKER_THREADS + 1] =3D {
>  	[NFSD_A_SERVER_WORKER_THREADS] =3D { .type =3D NLA_U32, },
> @@ -26,6 +32,11 @@ static const struct nla_policy nfsd_version_set_nl_pol=
icy[NFSD_A_SERVER_PROTO_VE
>  	[NFSD_A_SERVER_PROTO_VERSION] =3D NLA_POLICY_NESTED(nfsd_nfs_version_nl=
_policy),
>  };
> =20
> +/* NFSD_CMD_LISTENER_SET - do */
> +static const struct nla_policy nfsd_listener_set_nl_policy[NFSD_A_SERVER=
_LISTENER_INSTANCE + 1] =3D {
> +	[NFSD_A_SERVER_LISTENER_INSTANCE] =3D NLA_POLICY_NESTED(nfsd_server_ins=
tance_nl_policy),
> +};
> +
>  /* Ops table for nfsd */
>  static const struct genl_split_ops nfsd_nl_ops[] =3D {
>  	{
> @@ -59,6 +70,18 @@ static const struct genl_split_ops nfsd_nl_ops[] =3D {
>  		.doit	=3D nfsd_nl_version_get_doit,
>  		.flags	=3D GENL_CMD_CAP_DO,
>  	},
> +	{
> +		.cmd		=3D NFSD_CMD_LISTENER_SET,
> +		.doit		=3D nfsd_nl_listener_set_doit,
> +		.policy		=3D nfsd_listener_set_nl_policy,
> +		.maxattr	=3D NFSD_A_SERVER_LISTENER_INSTANCE,
> +		.flags		=3D GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
> +	},
> +	{
> +		.cmd	=3D NFSD_CMD_LISTENER_GET,
> +		.doit	=3D nfsd_nl_listener_get_doit,
> +		.flags	=3D GENL_CMD_CAP_DO,
> +	},
>  };
> =20
>  struct genl_family nfsd_nl_family __ro_after_init =3D {
> diff --git a/fs/nfsd/netlink.h b/fs/nfsd/netlink.h
> index c9a1be693fef..10a26ad32cd0 100644
> --- a/fs/nfsd/netlink.h
> +++ b/fs/nfsd/netlink.h
> @@ -13,6 +13,7 @@
> =20
>  /* Common nested types */
>  extern const struct nla_policy nfsd_nfs_version_nl_policy[NFSD_A_NFS_VER=
SION_MINOR + 1];
> +extern const struct nla_policy nfsd_server_instance_nl_policy[NFSD_A_SER=
VER_INSTANCE_INET_PROTO + 1];
> =20
>  int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb);
>  int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb);
> @@ -23,6 +24,8 @@ int nfsd_nl_threads_set_doit(struct sk_buff *skb, struc=
t genl_info *info);
>  int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info=
);
>  int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info=
);
>  int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info=
);
> +int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *inf=
o);
> +int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *inf=
o);
> =20
>  extern struct genl_family nfsd_nl_family;
> =20
> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index 53af82303f93..562b209f2921 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -1896,6 +1896,202 @@ int nfsd_nl_version_get_doit(struct sk_buff *skb,=
 struct genl_info *info)
>  	return err;
>  }
> =20
> +/**
> + * nfsd_nl_listener_set_doit - set the nfs running listeners
> + * @skb: reply buffer
> + * @info: netlink metadata and command arguments
> + *
> + * Return 0 on success or a negative errno.
> + */
> +int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *inf=
o)
> +{
> +	struct nlattr *tb[ARRAY_SIZE(nfsd_server_instance_nl_policy)];
> +	struct net *net =3D genl_info_net(info);
> +	struct svc_xprt *xprt, *tmp_xprt;
> +	const struct nlattr *attr;
> +	struct svc_serv *serv;
> +	const char *xcl_name;
> +	struct nfsd_net *nn;
> +	int port, err, rem;
> +	sa_family_t af;
> +
> +	if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_LISTENER_INSTANCE))
> +		return -EINVAL;
> +
> +	mutex_lock(&nfsd_mutex);
> +
> +	err =3D nfsd_create_serv(net);
> +	if (err) {
> +		mutex_unlock(&nfsd_mutex);
> +		return err;
> +	}
> +
> +	nn =3D net_generic(net, nfsd_net_id);
> +	serv =3D nn->nfsd_serv;
> +
> +	/* 1- create brand new listeners */
> +	nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
> +		if (nla_type(attr) !=3D NFSD_A_SERVER_LISTENER_INSTANCE)
> +			continue;
> +
> +		if (nla_parse_nested(tb, ARRAY_SIZE(tb), attr,
> +				     nfsd_server_instance_nl_policy,
> +				     info->extack) < 0)
> +			continue;
> +
> +		if (!tb[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME] ||
> +		    !tb[NFSD_A_SERVER_INSTANCE_PORT])
> +			continue;
> +
> +		xcl_name =3D nla_data(tb[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME]);
> +		port =3D nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_PORT]);
> +		if (port < 1 || port > USHRT_MAX)
> +			continue;
> +
> +		af =3D nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_INET_PROTO]);
> +		if (af !=3D PF_INET && af !=3D PF_INET6)
> +			continue;
> +
> +		xprt =3D svc_find_xprt(serv, xcl_name, net, PF_INET, port);
> +		if (xprt) {
> +			svc_xprt_put(xprt);
> +			continue;
> +		}
> +
> +		/* create new listerner */
> +		if (svc_xprt_create(serv, xcl_name, net, af, port,
> +				    SVC_SOCK_ANONYMOUS, get_current_cred()))
> +			continue;
> +	}
> +
> +	/* 2- remove stale listeners */


The old portlist interface was weird, in that it was only additive. You
couldn't use it to close a listening socket (AFAICT). We may be able to
support that now with this interface, but we'll need to test that case
carefully.


> +	spin_lock_bh(&serv->sv_lock);
> +	list_for_each_entry_safe(xprt, tmp_xprt, &serv->sv_permsocks,
> +				 xpt_list) {
> +		struct svc_xprt *rqt_xprt =3D NULL;
> +
> +		nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
> +			if (nla_type(attr) !=3D NFSD_A_SERVER_LISTENER_INSTANCE)
> +				continue;
> +
> +			if (nla_parse_nested(tb, ARRAY_SIZE(tb), attr,
> +					     nfsd_server_instance_nl_policy,
> +					     info->extack) < 0)
> +				continue;
> +
> +			if (!tb[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME] ||
> +			    !tb[NFSD_A_SERVER_INSTANCE_PORT])
> +				continue;
> +
> +			xcl_name =3D nla_data(
> +				tb[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME]);
> +			port =3D nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_PORT]);
> +			if (port < 1 || port > USHRT_MAX)
> +				continue;
> +
> +			af =3D nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_INET_PROTO]);
> +			if (af !=3D PF_INET && af !=3D PF_INET6)
> +				continue;
> +
> +			if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) &&
> +			    port =3D=3D svc_xprt_local_port(xprt) &&
> +			    af =3D=3D xprt->xpt_local.ss_family &&
> +			    xprt->xpt_net =3D=3D net) {
> +				rqt_xprt =3D xprt;
> +				break;
> +			}
> +		}
> +
> +		/* remove stale listener */
> +		if (!rqt_xprt) {
> +			spin_unlock_bh(&serv->sv_lock);
> +			svc_xprt_close(xprt);
>=20

I'm not sure this is safe. Can anything else modify sv_permsocks while
you're not holding the lock? Maybe not since you're holding the
nfsd_mutex, but it's still probably best to restart the list walk if you
have to drop the lock here.

You're typically only going to have a few sockets here anyway -- usually
just one each for TCP, UDP and maybe RDMA.


> +			spin_lock_bh(&serv->sv_lock);
> +		}
> +	}
> +	spin_unlock_bh(&serv->sv_lock);
> +
> +	if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
> +		nfsd_destroy_serv(net);
> +
> +	mutex_unlock(&nfsd_mutex);
> +
> +	return 0;
> +}
> +
> +/**
> + * nfsd_nl_listener_get_doit - get the nfs running listeners
> + * @skb: reply buffer
> + * @info: netlink metadata and command arguments
> + *
> + * Return 0 on success or a negative errno.
> + */
> +int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *inf=
o)
> +{
> +	struct svc_xprt *xprt;
> +	struct svc_serv *serv;
> +	struct nfsd_net *nn;
> +	void *hdr;
> +	int err;
> +
> +	skb =3D genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
> +	if (!skb)
> +		return -ENOMEM;
> +
> +	hdr =3D genlmsg_iput(skb, info);
> +	if (!hdr) {
> +		err =3D -EMSGSIZE;
> +		goto err_free_msg;
> +	}
> +
> +	mutex_lock(&nfsd_mutex);
> +	nn =3D net_generic(genl_info_net(info), nfsd_net_id);
> +	if (!nn->nfsd_serv) {
> +		err =3D -EINVAL;
> +		goto err_nfsd_unlock;
> +	}
> +
> +	serv =3D nn->nfsd_serv;
> +	spin_lock_bh(&serv->sv_lock);
> +	list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
> +		struct nlattr *attr;
> +
> +		attr =3D nla_nest_start_noflag(skb,
> +					     NFSD_A_SERVER_LISTENER_INSTANCE);
> +		if (!attr) {
> +			err =3D -EINVAL;
> +			goto err_serv_unlock;
> +		}
> +
> +		if (nla_put_string(skb, NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME,
> +				   xprt->xpt_class->xcl_name) ||
> +		    nla_put_u32(skb, NFSD_A_SERVER_INSTANCE_PORT,
> +				svc_xprt_local_port(xprt)) ||
> +		    nla_put_u16(skb, NFSD_A_SERVER_INSTANCE_INET_PROTO,
> +				xprt->xpt_local.ss_family)) {
> +			err =3D -EINVAL;
> +			goto err_serv_unlock;
> +		}
> +
> +		nla_nest_end(skb, attr);
> +	}
> +	spin_unlock_bh(&serv->sv_lock);
> +	mutex_unlock(&nfsd_mutex);
> +
> +	genlmsg_end(skb, hdr);
> +
> +	return genlmsg_reply(skb, info);
> +
> +err_serv_unlock:
> +	spin_unlock_bh(&serv->sv_lock);
> +err_nfsd_unlock:
> +	mutex_unlock(&nfsd_mutex);
> +err_free_msg:
> +	nlmsg_free(skb);
> +
> +	return err;
> +}
> +
>  /**
>   * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
>   * @net: a freshly-created network namespace
> diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_=
netlink.h
> index 2a06f9fe6fe9..659ab76b8840 100644
> --- a/include/uapi/linux/nfsd_netlink.h
> +++ b/include/uapi/linux/nfsd_netlink.h
> @@ -51,12 +51,30 @@ enum {
>  	NFSD_A_SERVER_PROTO_MAX =3D (__NFSD_A_SERVER_PROTO_MAX - 1)
>  };
> =20
> +enum {
> +	NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME =3D 1,
> +	NFSD_A_SERVER_INSTANCE_PORT,
> +	NFSD_A_SERVER_INSTANCE_INET_PROTO,
> +
> +	__NFSD_A_SERVER_INSTANCE_MAX,
> +	NFSD_A_SERVER_INSTANCE_MAX =3D (__NFSD_A_SERVER_INSTANCE_MAX - 1)
> +};
> +
> +enum {
> +	NFSD_A_SERVER_LISTENER_INSTANCE =3D 1,
> +
> +	__NFSD_A_SERVER_LISTENER_MAX,
> +	NFSD_A_SERVER_LISTENER_MAX =3D (__NFSD_A_SERVER_LISTENER_MAX - 1)
> +};
> +
>  enum {
>  	NFSD_CMD_RPC_STATUS_GET =3D 1,
>  	NFSD_CMD_THREADS_SET,
>  	NFSD_CMD_THREADS_GET,
>  	NFSD_CMD_VERSION_SET,
>  	NFSD_CMD_VERSION_GET,
> +	NFSD_CMD_LISTENER_SET,
> +	NFSD_CMD_LISTENER_GET,
> =20
>  	__NFSD_CMD_MAX,
>  	NFSD_CMD_MAX =3D (__NFSD_CMD_MAX - 1)
> diff --git a/tools/net/ynl/generated/nfsd-user.c b/tools/net/ynl/generate=
d/nfsd-user.c
> index ad498543f464..d52f392c7f59 100644
> --- a/tools/net/ynl/generated/nfsd-user.c
> +++ b/tools/net/ynl/generated/nfsd-user.c
> @@ -19,6 +19,8 @@ static const char * const nfsd_op_strmap[] =3D {
>  	[NFSD_CMD_THREADS_GET] =3D "threads-get",
>  	[NFSD_CMD_VERSION_SET] =3D "version-set",
>  	[NFSD_CMD_VERSION_GET] =3D "version-get",
> +	[NFSD_CMD_LISTENER_SET] =3D "listener-set",
> +	[NFSD_CMD_LISTENER_GET] =3D "listener-get",
>  };
> =20
>  const char *nfsd_op_str(int op)
> @@ -39,6 +41,17 @@ struct ynl_policy_nest nfsd_nfs_version_nest =3D {
>  	.table =3D nfsd_nfs_version_policy,
>  };
> =20
> +struct ynl_policy_attr nfsd_server_instance_policy[NFSD_A_SERVER_INSTANC=
E_MAX + 1] =3D {
> +	[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME] =3D { .name =3D "transport-name=
", .type =3D YNL_PT_NUL_STR, },
> +	[NFSD_A_SERVER_INSTANCE_PORT] =3D { .name =3D "port", .type =3D YNL_PT_=
U32, },
> +	[NFSD_A_SERVER_INSTANCE_INET_PROTO] =3D { .name =3D "inet-proto", .type=
 =3D YNL_PT_U16, },
> +};
> +
> +struct ynl_policy_nest nfsd_server_instance_nest =3D {
> +	.max_attr =3D NFSD_A_SERVER_INSTANCE_MAX,
> +	.table =3D nfsd_server_instance_policy,
> +};
> +
>  struct ynl_policy_attr nfsd_rpc_status_policy[NFSD_A_RPC_STATUS_MAX + 1]=
 =3D {
>  	[NFSD_A_RPC_STATUS_XID] =3D { .name =3D "xid", .type =3D YNL_PT_U32, },
>  	[NFSD_A_RPC_STATUS_FLAGS] =3D { .name =3D "flags", .type =3D YNL_PT_U32=
, },
> @@ -79,6 +92,15 @@ struct ynl_policy_nest nfsd_server_proto_nest =3D {
>  	.table =3D nfsd_server_proto_policy,
>  };
> =20
> +struct ynl_policy_attr nfsd_server_listener_policy[NFSD_A_SERVER_LISTENE=
R_MAX + 1] =3D {
> +	[NFSD_A_SERVER_LISTENER_INSTANCE] =3D { .name =3D "instance", .type =3D=
 YNL_PT_NEST, .nest =3D &nfsd_server_instance_nest, },
> +};
> +
> +struct ynl_policy_nest nfsd_server_listener_nest =3D {
> +	.max_attr =3D NFSD_A_SERVER_LISTENER_MAX,
> +	.table =3D nfsd_server_listener_policy,
> +};
> +
>  /* Common nested types */
>  void nfsd_nfs_version_free(struct nfsd_nfs_version *obj)
>  {
> @@ -124,6 +146,64 @@ int nfsd_nfs_version_parse(struct ynl_parse_arg *yar=
g,
>  	return 0;
>  }
> =20
> +void nfsd_server_instance_free(struct nfsd_server_instance *obj)
> +{
> +	free(obj->transport_name);
> +}
> +
> +int nfsd_server_instance_put(struct nlmsghdr *nlh, unsigned int attr_typ=
e,
> +			     struct nfsd_server_instance *obj)
> +{
> +	struct nlattr *nest;
> +
> +	nest =3D mnl_attr_nest_start(nlh, attr_type);
> +	if (obj->_present.transport_name_len)
> +		mnl_attr_put_strz(nlh, NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME, obj->tra=
nsport_name);
> +	if (obj->_present.port)
> +		mnl_attr_put_u32(nlh, NFSD_A_SERVER_INSTANCE_PORT, obj->port);
> +	if (obj->_present.inet_proto)
> +		mnl_attr_put_u16(nlh, NFSD_A_SERVER_INSTANCE_INET_PROTO, obj->inet_pro=
to);
> +	mnl_attr_nest_end(nlh, nest);
> +
> +	return 0;
> +}
> +
> +int nfsd_server_instance_parse(struct ynl_parse_arg *yarg,
> +			       const struct nlattr *nested)
> +{
> +	struct nfsd_server_instance *dst =3D yarg->data;
> +	const struct nlattr *attr;
> +
> +	mnl_attr_for_each_nested(attr, nested) {
> +		unsigned int type =3D mnl_attr_get_type(attr);
> +
> +		if (type =3D=3D NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME) {
> +			unsigned int len;
> +
> +			if (ynl_attr_validate(yarg, attr))
> +				return MNL_CB_ERROR;
> +
> +			len =3D strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr=
));
> +			dst->_present.transport_name_len =3D len;
> +			dst->transport_name =3D malloc(len + 1);
> +			memcpy(dst->transport_name, mnl_attr_get_str(attr), len);
> +			dst->transport_name[len] =3D 0;
> +		} else if (type =3D=3D NFSD_A_SERVER_INSTANCE_PORT) {
> +			if (ynl_attr_validate(yarg, attr))
> +				return MNL_CB_ERROR;
> +			dst->_present.port =3D 1;
> +			dst->port =3D mnl_attr_get_u32(attr);
> +		} else if (type =3D=3D NFSD_A_SERVER_INSTANCE_INET_PROTO) {
> +			if (ynl_attr_validate(yarg, attr))
> +				return MNL_CB_ERROR;
> +			dst->_present.inet_proto =3D 1;
> +			dst->inet_proto =3D mnl_attr_get_u16(attr);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  /* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_RPC_STATUS_GET =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
>  /* NFSD_CMD_RPC_STATUS_GET - dump */
>  int nfsd_rpc_status_get_rsp_dump_parse(const struct nlmsghdr *nlh, void =
*data)
> @@ -467,6 +547,117 @@ struct nfsd_version_get_rsp *nfsd_version_get(struc=
t ynl_sock *ys)
>  	return NULL;
>  }
> =20
> +/* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_LISTENER_SET =3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
> +/* NFSD_CMD_LISTENER_SET - do */
> +void nfsd_listener_set_req_free(struct nfsd_listener_set_req *req)
> +{
> +	unsigned int i;
> +
> +	for (i =3D 0; i < req->n_instance; i++)
> +		nfsd_server_instance_free(&req->instance[i]);
> +	free(req->instance);
> +	free(req);
> +}
> +
> +int nfsd_listener_set(struct ynl_sock *ys, struct nfsd_listener_set_req =
*req)
> +{
> +	struct ynl_req_state yrs =3D { .yarg =3D { .ys =3D ys, }, };
> +	struct nlmsghdr *nlh;
> +	int err;
> +
> +	nlh =3D ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_LISTENER_SET, 1=
);
> +	ys->req_policy =3D &nfsd_server_listener_nest;
> +
> +	for (unsigned int i =3D 0; i < req->n_instance; i++)
> +		nfsd_server_instance_put(nlh, NFSD_A_SERVER_LISTENER_INSTANCE, &req->i=
nstance[i]);
> +
> +	err =3D ynl_exec(ys, nlh, &yrs);
> +	if (err < 0)
> +		return -1;
> +
> +	return 0;
> +}
> +
> +/* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_LISTENER_GET =3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
> +/* NFSD_CMD_LISTENER_GET - do */
> +void nfsd_listener_get_rsp_free(struct nfsd_listener_get_rsp *rsp)
> +{
> +	unsigned int i;
> +
> +	for (i =3D 0; i < rsp->n_instance; i++)
> +		nfsd_server_instance_free(&rsp->instance[i]);
> +	free(rsp->instance);
> +	free(rsp);
> +}
> +
> +int nfsd_listener_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
> +{
> +	struct nfsd_listener_get_rsp *dst;
> +	struct ynl_parse_arg *yarg =3D data;
> +	unsigned int n_instance =3D 0;
> +	const struct nlattr *attr;
> +	struct ynl_parse_arg parg;
> +	int i;
> +
> +	dst =3D yarg->data;
> +	parg.ys =3D yarg->ys;
> +
> +	if (dst->instance)
> +		return ynl_error_parse(yarg, "attribute already present (server-listen=
er.instance)");
> +
> +	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
> +		unsigned int type =3D mnl_attr_get_type(attr);
> +
> +		if (type =3D=3D NFSD_A_SERVER_LISTENER_INSTANCE) {
> +			n_instance++;
> +		}
> +	}
> +
> +	if (n_instance) {
> +		dst->instance =3D calloc(n_instance, sizeof(*dst->instance));
> +		dst->n_instance =3D n_instance;
> +		i =3D 0;
> +		parg.rsp_policy =3D &nfsd_server_instance_nest;
> +		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
> +			if (mnl_attr_get_type(attr) =3D=3D NFSD_A_SERVER_LISTENER_INSTANCE) {
> +				parg.data =3D &dst->instance[i];
> +				if (nfsd_server_instance_parse(&parg, attr))
> +					return MNL_CB_ERROR;
> +				i++;
> +			}
> +		}
> +	}
> +
> +	return MNL_CB_OK;
> +}
> +
> +struct nfsd_listener_get_rsp *nfsd_listener_get(struct ynl_sock *ys)
> +{
> +	struct ynl_req_state yrs =3D { .yarg =3D { .ys =3D ys, }, };
> +	struct nfsd_listener_get_rsp *rsp;
> +	struct nlmsghdr *nlh;
> +	int err;
> +
> +	nlh =3D ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_LISTENER_GET, 1=
);
> +	ys->req_policy =3D &nfsd_server_listener_nest;
> +	yrs.yarg.rsp_policy =3D &nfsd_server_listener_nest;
> +
> +	rsp =3D calloc(1, sizeof(*rsp));
> +	yrs.yarg.data =3D rsp;
> +	yrs.cb =3D nfsd_listener_get_rsp_parse;
> +	yrs.rsp_cmd =3D NFSD_CMD_LISTENER_GET;
> +
> +	err =3D ynl_exec(ys, nlh, &yrs);
> +	if (err < 0)
> +		goto err_free;
> +
> +	return rsp;
> +
> +err_free:
> +	nfsd_listener_get_rsp_free(rsp);
> +	return NULL;
> +}
> +
>  const struct ynl_family ynl_nfsd_family =3D  {
>  	.name		=3D "nfsd",
>  };
> diff --git a/tools/net/ynl/generated/nfsd-user.h b/tools/net/ynl/generate=
d/nfsd-user.h
> index d062ee8fa8b6..5765fb6f2ef5 100644
> --- a/tools/net/ynl/generated/nfsd-user.h
> +++ b/tools/net/ynl/generated/nfsd-user.h
> @@ -29,6 +29,18 @@ struct nfsd_nfs_version {
>  	__u32 minor;
>  };
> =20
> +struct nfsd_server_instance {
> +	struct {
> +		__u32 transport_name_len;
> +		__u32 port:1;
> +		__u32 inet_proto:1;
> +	} _present;
> +
> +	char *transport_name;
> +	__u32 port;
> +	__u16 inet_proto;
> +};
> +
>  /* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_RPC_STATUS_GET =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
>  /* NFSD_CMD_RPC_STATUS_GET - dump */
>  struct nfsd_rpc_status_get_rsp_dump {
> @@ -164,4 +176,47 @@ void nfsd_version_get_rsp_free(struct nfsd_version_g=
et_rsp *rsp);
>   */
>  struct nfsd_version_get_rsp *nfsd_version_get(struct ynl_sock *ys);
> =20
> +/* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_LISTENER_SET =3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
> +/* NFSD_CMD_LISTENER_SET - do */
> +struct nfsd_listener_set_req {
> +	unsigned int n_instance;
> +	struct nfsd_server_instance *instance;
> +};
> +
> +static inline struct nfsd_listener_set_req *nfsd_listener_set_req_alloc(=
void)
> +{
> +	return calloc(1, sizeof(struct nfsd_listener_set_req));
> +}
> +void nfsd_listener_set_req_free(struct nfsd_listener_set_req *req);
> +
> +static inline void
> +__nfsd_listener_set_req_set_instance(struct nfsd_listener_set_req *req,
> +				     struct nfsd_server_instance *instance,
> +				     unsigned int n_instance)
> +{
> +	free(req->instance);
> +	req->instance =3D instance;
> +	req->n_instance =3D n_instance;
> +}
> +
> +/*
> + * set nfs running listeners
> + */
> +int nfsd_listener_set(struct ynl_sock *ys, struct nfsd_listener_set_req =
*req);
> +
> +/* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_LISTENER_GET =3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */
> +/* NFSD_CMD_LISTENER_GET - do */
> +
> +struct nfsd_listener_get_rsp {
> +	unsigned int n_instance;
> +	struct nfsd_server_instance *instance;
> +};
> +
> +void nfsd_listener_get_rsp_free(struct nfsd_listener_get_rsp *rsp);
> +
> +/*
> + * get nfs running listeners
> + */
> +struct nfsd_listener_get_rsp *nfsd_listener_get(struct ynl_sock *ys);
> +
>  #endif /* _LINUX_NFSD_GEN_H */

--=20
Jeff Layton <jlayton@kernel.org>