Re: [PATCH v6 3/3] NFSD: add write_ports to netlink command

[Lorenzo Bianconi <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).
> > 
> 
> 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(+)
> > 
> > diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/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
> >  
> >  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[NFSD_A_NFS_VERSION_MINOR + 1]
> >  	[NFSD_A_NFS_VERSION_MINOR] = { .type = NLA_U32, },
> >  };
> >  
> > +const struct nla_policy nfsd_server_instance_nl_policy[NFSD_A_SERVER_INSTANCE_INET_PROTO + 1] = {
> > +	[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME] = { .type = NLA_NUL_STRING, },
> > +	[NFSD_A_SERVER_INSTANCE_PORT] = { .type = NLA_U32, },
> > +	[NFSD_A_SERVER_INSTANCE_INET_PROTO] = { .type = NLA_U16, },
> > +};
> > +
> >  /* NFSD_CMD_THREADS_SET - do */
> >  static const struct nla_policy nfsd_threads_set_nl_policy[NFSD_A_SERVER_WORKER_THREADS + 1] = {
> >  	[NFSD_A_SERVER_WORKER_THREADS] = { .type = NLA_U32, },
> > @@ -26,6 +32,11 @@ static const struct nla_policy nfsd_version_set_nl_policy[NFSD_A_SERVER_PROTO_VE
> >  	[NFSD_A_SERVER_PROTO_VERSION] = NLA_POLICY_NESTED(nfsd_nfs_version_nl_policy),
> >  };
> >  
> > +/* NFSD_CMD_LISTENER_SET - do */
> > +static const struct nla_policy nfsd_listener_set_nl_policy[NFSD_A_SERVER_LISTENER_INSTANCE + 1] = {
> > +	[NFSD_A_SERVER_LISTENER_INSTANCE] = NLA_POLICY_NESTED(nfsd_server_instance_nl_policy),
> > +};
> > +
> >  /* Ops table for nfsd */
> >  static const struct genl_split_ops nfsd_nl_ops[] = {
> >  	{
> > @@ -59,6 +70,18 @@ static const struct genl_split_ops nfsd_nl_ops[] = {
> >  		.doit	= nfsd_nl_version_get_doit,
> >  		.flags	= GENL_CMD_CAP_DO,
> >  	},
> > +	{
> > +		.cmd		= NFSD_CMD_LISTENER_SET,
> > +		.doit		= nfsd_nl_listener_set_doit,
> > +		.policy		= nfsd_listener_set_nl_policy,
> > +		.maxattr	= NFSD_A_SERVER_LISTENER_INSTANCE,
> > +		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
> > +	},
> > +	{
> > +		.cmd	= NFSD_CMD_LISTENER_GET,
> > +		.doit	= nfsd_nl_listener_get_doit,
> > +		.flags	= GENL_CMD_CAP_DO,
> > +	},
> >  };
> >  
> >  struct genl_family nfsd_nl_family __ro_after_init = {
> > 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 @@
> >  
> >  /* Common nested types */
> >  extern const struct nla_policy nfsd_nfs_version_nl_policy[NFSD_A_NFS_VERSION_MINOR + 1];
> > +extern const struct nla_policy nfsd_server_instance_nl_policy[NFSD_A_SERVER_INSTANCE_INET_PROTO + 1];
> >  
> >  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, struct 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 *info);
> > +int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info);
> >  
> >  extern struct genl_family nfsd_nl_family;
> >  
> > 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;
> >  }
> >  
> > +/**
> > + * 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 *info)
> > +{
> > +	struct nlattr *tb[ARRAY_SIZE(nfsd_server_instance_nl_policy)];
> > +	struct net *net = 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 = nfsd_create_serv(net);
> > +	if (err) {
> > +		mutex_unlock(&nfsd_mutex);
> > +		return err;
> > +	}
> > +
> > +	nn = net_generic(net, nfsd_net_id);
> > +	serv = nn->nfsd_serv;
> > +
> > +	/* 1- create brand new listeners */
> > +	nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
> > +		if (nla_type(attr) != 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 = nla_data(tb[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME]);
> > +		port = nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_PORT]);
> > +		if (port < 1 || port > USHRT_MAX)
> > +			continue;
> > +
> > +		af = nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_INET_PROTO]);
> > +		if (af != PF_INET && af != PF_INET6)
> > +			continue;
> > +
> > +		xprt = 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 = NULL;
> > +
> > +		nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
> > +			if (nla_type(attr) != 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 = nla_data(
> > +				tb[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME]);
> > +			port = nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_PORT]);
> > +			if (port < 1 || port > USHRT_MAX)
> > +				continue;
> > +
> > +			af = nla_get_u32(tb[NFSD_A_SERVER_INSTANCE_INET_PROTO]);
> > +			if (af != PF_INET && af != PF_INET6)
> > +				continue;
> > +
> > +			if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) &&
> > +			    port == svc_xprt_local_port(xprt) &&
> > +			    af == xprt->xpt_local.ss_family &&
> > +			    xprt->xpt_net == net) {
> > +				rqt_xprt = xprt;
> > +				break;
> > +			}
> > +		}
> > +
> > +		/* remove stale listener */
> > +		if (!rqt_xprt) {
> > +			spin_unlock_bh(&serv->sv_lock);
> > +			svc_xprt_close(xprt);
> > 
> 
> 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.

what about beeing a bit proactive and set XPT_CLOSE bit before releasing the
spinlock (as we already do in svc_xprt_close)?

Regards,
Lorenzo

> 
> 
> > +			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 *info)
> > +{
> > +	struct svc_xprt *xprt;
> > +	struct svc_serv *serv;
> > +	struct nfsd_net *nn;
> > +	void *hdr;
> > +	int err;
> > +
> > +	skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
> > +	if (!skb)
> > +		return -ENOMEM;
> > +
> > +	hdr = genlmsg_iput(skb, info);
> > +	if (!hdr) {
> > +		err = -EMSGSIZE;
> > +		goto err_free_msg;
> > +	}
> > +
> > +	mutex_lock(&nfsd_mutex);
> > +	nn = net_generic(genl_info_net(info), nfsd_net_id);
> > +	if (!nn->nfsd_serv) {
> > +		err = -EINVAL;
> > +		goto err_nfsd_unlock;
> > +	}
> > +
> > +	serv = nn->nfsd_serv;
> > +	spin_lock_bh(&serv->sv_lock);
> > +	list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
> > +		struct nlattr *attr;
> > +
> > +		attr = nla_nest_start_noflag(skb,
> > +					     NFSD_A_SERVER_LISTENER_INSTANCE);
> > +		if (!attr) {
> > +			err = -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 = -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 = (__NFSD_A_SERVER_PROTO_MAX - 1)
> >  };
> >  
> > +enum {
> > +	NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME = 1,
> > +	NFSD_A_SERVER_INSTANCE_PORT,
> > +	NFSD_A_SERVER_INSTANCE_INET_PROTO,
> > +
> > +	__NFSD_A_SERVER_INSTANCE_MAX,
> > +	NFSD_A_SERVER_INSTANCE_MAX = (__NFSD_A_SERVER_INSTANCE_MAX - 1)
> > +};
> > +
> > +enum {
> > +	NFSD_A_SERVER_LISTENER_INSTANCE = 1,
> > +
> > +	__NFSD_A_SERVER_LISTENER_MAX,
> > +	NFSD_A_SERVER_LISTENER_MAX = (__NFSD_A_SERVER_LISTENER_MAX - 1)
> > +};
> > +
> >  enum {
> >  	NFSD_CMD_RPC_STATUS_GET = 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,
> >  
> >  	__NFSD_CMD_MAX,
> >  	NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1)
> > diff --git a/tools/net/ynl/generated/nfsd-user.c b/tools/net/ynl/generated/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[] = {
> >  	[NFSD_CMD_THREADS_GET] = "threads-get",
> >  	[NFSD_CMD_VERSION_SET] = "version-set",
> >  	[NFSD_CMD_VERSION_GET] = "version-get",
> > +	[NFSD_CMD_LISTENER_SET] = "listener-set",
> > +	[NFSD_CMD_LISTENER_GET] = "listener-get",
> >  };
> >  
> >  const char *nfsd_op_str(int op)
> > @@ -39,6 +41,17 @@ struct ynl_policy_nest nfsd_nfs_version_nest = {
> >  	.table = nfsd_nfs_version_policy,
> >  };
> >  
> > +struct ynl_policy_attr nfsd_server_instance_policy[NFSD_A_SERVER_INSTANCE_MAX + 1] = {
> > +	[NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME] = { .name = "transport-name", .type = YNL_PT_NUL_STR, },
> > +	[NFSD_A_SERVER_INSTANCE_PORT] = { .name = "port", .type = YNL_PT_U32, },
> > +	[NFSD_A_SERVER_INSTANCE_INET_PROTO] = { .name = "inet-proto", .type = YNL_PT_U16, },
> > +};
> > +
> > +struct ynl_policy_nest nfsd_server_instance_nest = {
> > +	.max_attr = NFSD_A_SERVER_INSTANCE_MAX,
> > +	.table = nfsd_server_instance_policy,
> > +};
> > +
> >  struct ynl_policy_attr nfsd_rpc_status_policy[NFSD_A_RPC_STATUS_MAX + 1] = {
> >  	[NFSD_A_RPC_STATUS_XID] = { .name = "xid", .type = YNL_PT_U32, },
> >  	[NFSD_A_RPC_STATUS_FLAGS] = { .name = "flags", .type = YNL_PT_U32, },
> > @@ -79,6 +92,15 @@ struct ynl_policy_nest nfsd_server_proto_nest = {
> >  	.table = nfsd_server_proto_policy,
> >  };
> >  
> > +struct ynl_policy_attr nfsd_server_listener_policy[NFSD_A_SERVER_LISTENER_MAX + 1] = {
> > +	[NFSD_A_SERVER_LISTENER_INSTANCE] = { .name = "instance", .type = YNL_PT_NEST, .nest = &nfsd_server_instance_nest, },
> > +};
> > +
> > +struct ynl_policy_nest nfsd_server_listener_nest = {
> > +	.max_attr = NFSD_A_SERVER_LISTENER_MAX,
> > +	.table = 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 *yarg,
> >  	return 0;
> >  }
> >  
> > +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_type,
> > +			     struct nfsd_server_instance *obj)
> > +{
> > +	struct nlattr *nest;
> > +
> > +	nest = 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->transport_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_proto);
> > +	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 = yarg->data;
> > +	const struct nlattr *attr;
> > +
> > +	mnl_attr_for_each_nested(attr, nested) {
> > +		unsigned int type = mnl_attr_get_type(attr);
> > +
> > +		if (type == NFSD_A_SERVER_INSTANCE_TRANSPORT_NAME) {
> > +			unsigned int len;
> > +
> > +			if (ynl_attr_validate(yarg, attr))
> > +				return MNL_CB_ERROR;
> > +
> > +			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
> > +			dst->_present.transport_name_len = len;
> > +			dst->transport_name = malloc(len + 1);
> > +			memcpy(dst->transport_name, mnl_attr_get_str(attr), len);
> > +			dst->transport_name[len] = 0;
> > +		} else if (type == NFSD_A_SERVER_INSTANCE_PORT) {
> > +			if (ynl_attr_validate(yarg, attr))
> > +				return MNL_CB_ERROR;
> > +			dst->_present.port = 1;
> > +			dst->port = mnl_attr_get_u32(attr);
> > +		} else if (type == NFSD_A_SERVER_INSTANCE_INET_PROTO) {
> > +			if (ynl_attr_validate(yarg, attr))
> > +				return MNL_CB_ERROR;
> > +			dst->_present.inet_proto = 1;
> > +			dst->inet_proto = mnl_attr_get_u16(attr);
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >  /* ============== NFSD_CMD_RPC_STATUS_GET ============== */
> >  /* 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(struct ynl_sock *ys)
> >  	return NULL;
> >  }
> >  
> > +/* ============== NFSD_CMD_LISTENER_SET ============== */
> > +/* NFSD_CMD_LISTENER_SET - do */
> > +void nfsd_listener_set_req_free(struct nfsd_listener_set_req *req)
> > +{
> > +	unsigned int i;
> > +
> > +	for (i = 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 = { .yarg = { .ys = ys, }, };
> > +	struct nlmsghdr *nlh;
> > +	int err;
> > +
> > +	nlh = ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_LISTENER_SET, 1);
> > +	ys->req_policy = &nfsd_server_listener_nest;
> > +
> > +	for (unsigned int i = 0; i < req->n_instance; i++)
> > +		nfsd_server_instance_put(nlh, NFSD_A_SERVER_LISTENER_INSTANCE, &req->instance[i]);
> > +
> > +	err = ynl_exec(ys, nlh, &yrs);
> > +	if (err < 0)
> > +		return -1;
> > +
> > +	return 0;
> > +}
> > +
> > +/* ============== NFSD_CMD_LISTENER_GET ============== */
> > +/* NFSD_CMD_LISTENER_GET - do */
> > +void nfsd_listener_get_rsp_free(struct nfsd_listener_get_rsp *rsp)
> > +{
> > +	unsigned int i;
> > +
> > +	for (i = 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 = data;
> > +	unsigned int n_instance = 0;
> > +	const struct nlattr *attr;
> > +	struct ynl_parse_arg parg;
> > +	int i;
> > +
> > +	dst = yarg->data;
> > +	parg.ys = yarg->ys;
> > +
> > +	if (dst->instance)
> > +		return ynl_error_parse(yarg, "attribute already present (server-listener.instance)");
> > +
> > +	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
> > +		unsigned int type = mnl_attr_get_type(attr);
> > +
> > +		if (type == NFSD_A_SERVER_LISTENER_INSTANCE) {
> > +			n_instance++;
> > +		}
> > +	}
> > +
> > +	if (n_instance) {
> > +		dst->instance = calloc(n_instance, sizeof(*dst->instance));
> > +		dst->n_instance = n_instance;
> > +		i = 0;
> > +		parg.rsp_policy = &nfsd_server_instance_nest;
> > +		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
> > +			if (mnl_attr_get_type(attr) == NFSD_A_SERVER_LISTENER_INSTANCE) {
> > +				parg.data = &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 = { .yarg = { .ys = ys, }, };
> > +	struct nfsd_listener_get_rsp *rsp;
> > +	struct nlmsghdr *nlh;
> > +	int err;
> > +
> > +	nlh = ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_LISTENER_GET, 1);
> > +	ys->req_policy = &nfsd_server_listener_nest;
> > +	yrs.yarg.rsp_policy = &nfsd_server_listener_nest;
> > +
> > +	rsp = calloc(1, sizeof(*rsp));
> > +	yrs.yarg.data = rsp;
> > +	yrs.cb = nfsd_listener_get_rsp_parse;
> > +	yrs.rsp_cmd = NFSD_CMD_LISTENER_GET;
> > +
> > +	err = 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 =  {
> >  	.name		= "nfsd",
> >  };
> > diff --git a/tools/net/ynl/generated/nfsd-user.h b/tools/net/ynl/generated/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;
> >  };
> >  
> > +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;
> > +};
> > +
> >  /* ============== NFSD_CMD_RPC_STATUS_GET ============== */
> >  /* 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_get_rsp *rsp);
> >   */
> >  struct nfsd_version_get_rsp *nfsd_version_get(struct ynl_sock *ys);
> >  
> > +/* ============== NFSD_CMD_LISTENER_SET ============== */
> > +/* 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 = instance;
> > +	req->n_instance = n_instance;
> > +}
> > +
> > +/*
> > + * set nfs running listeners
> > + */
> > +int nfsd_listener_set(struct ynl_sock *ys, struct nfsd_listener_set_req *req);
> > +
> > +/* ============== NFSD_CMD_LISTENER_GET ============== */
> > +/* 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 */
> 
> -- 
> Jeff Layton <jlayton@kernel.org>
> 

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