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Message-ID: <bd85d1a774cb362ab9f70ac6a2af70d9ed7a309e.1712853394.git.lorenzo@kernel.org>
Date: Thu, 11 Apr 2024 18:47:25 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: linux-nfs@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com,
chuck.lever@...cle.com,
jlayton@...nel.org,
neilb@...e.de,
netdev@...r.kernel.org,
kuba@...nel.org
Subject: [PATCH v7 2/5] NFSD: add write_version to netlink command
Introduce write_version netlink command through a "declarative" interface.
This patch introduces a change in behavior since for version-set userspace
is expected to provide a NFS major/minor version list it wants to enable
while all the other ones will be disabled. (procfs write_version
command implements imperative interface where the admin writes +3/-3 to
enable/disable a single version.
Tested-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
Documentation/netlink/specs/nfsd.yaml | 37 +++++++
fs/nfsd/netlink.c | 24 ++++
fs/nfsd/netlink.h | 5 +
fs/nfsd/netns.h | 1 +
fs/nfsd/nfsctl.c | 153 ++++++++++++++++++++++++++
fs/nfsd/nfssvc.c | 3 +-
include/uapi/linux/nfsd_netlink.h | 18 +++
7 files changed, 239 insertions(+), 2 deletions(-)
diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/specs/nfsd.yaml
index c92e1425d316..cb93e3e37119 100644
--- a/Documentation/netlink/specs/nfsd.yaml
+++ b/Documentation/netlink/specs/nfsd.yaml
@@ -68,6 +68,26 @@ attribute-sets:
-
name: threads
type: u32
+ -
+ name: version
+ attributes:
+ -
+ name: major
+ type: u32
+ -
+ name: minor
+ type: u32
+ -
+ name: enabled
+ type: flag
+ -
+ name: server-proto
+ attributes:
+ -
+ name: version
+ type: nest
+ nested-attributes: version
+ multi-attr: true
operations:
list:
@@ -110,3 +130,20 @@ operations:
reply:
attributes:
- threads
+ -
+ name: version-set
+ doc: set nfs enabled versions
+ attribute-set: server-proto
+ flags: [ admin-perm ]
+ do:
+ request:
+ attributes:
+ - version
+ -
+ name: version-get
+ doc: get nfs enabled versions
+ attribute-set: server-proto
+ do:
+ reply:
+ attributes:
+ - version
diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c
index 1a59a8e6c7e2..75f609b57ceb 100644
--- a/fs/nfsd/netlink.c
+++ b/fs/nfsd/netlink.c
@@ -10,11 +10,23 @@
#include <uapi/linux/nfsd_netlink.h>
+/* Common nested types */
+const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1] = {
+ [NFSD_A_VERSION_MAJOR] = { .type = NLA_U32, },
+ [NFSD_A_VERSION_MINOR] = { .type = NLA_U32, },
+ [NFSD_A_VERSION_ENABLED] = { .type = NLA_FLAG, },
+};
+
/* 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, },
};
+/* NFSD_CMD_VERSION_SET - do */
+static const struct nla_policy nfsd_version_set_nl_policy[NFSD_A_SERVER_PROTO_VERSION + 1] = {
+ [NFSD_A_SERVER_PROTO_VERSION] = NLA_POLICY_NESTED(nfsd_version_nl_policy),
+};
+
/* Ops table for nfsd */
static const struct genl_split_ops nfsd_nl_ops[] = {
{
@@ -36,6 +48,18 @@ static const struct genl_split_ops nfsd_nl_ops[] = {
.doit = nfsd_nl_threads_get_doit,
.flags = GENL_CMD_CAP_DO,
},
+ {
+ .cmd = NFSD_CMD_VERSION_SET,
+ .doit = nfsd_nl_version_set_doit,
+ .policy = nfsd_version_set_nl_policy,
+ .maxattr = NFSD_A_SERVER_PROTO_VERSION,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = NFSD_CMD_VERSION_GET,
+ .doit = nfsd_nl_version_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 4137fac477e4..c7c0da275481 100644
--- a/fs/nfsd/netlink.h
+++ b/fs/nfsd/netlink.h
@@ -11,6 +11,9 @@
#include <uapi/linux/nfsd_netlink.h>
+/* Common nested types */
+extern const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1];
+
int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb);
int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb);
@@ -18,6 +21,8 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
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);
extern struct genl_family nfsd_nl_family;
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index d4be519b5734..14ec15656320 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -218,6 +218,7 @@ struct nfsd_net {
/* Simple check to find out if a given net was properly initialized */
#define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
+extern bool nfsd_support_version(int vers);
extern void nfsd_netns_free_versions(struct nfsd_net *nn);
extern unsigned int nfsd_net_id;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 71608744e67f..341efab4eaa7 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1711,6 +1711,159 @@ int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info)
return err;
}
+/**
+ * nfsd_nl_version_set_doit - set the nfs enabled versions
+ * @skb: reply buffer
+ * @info: netlink metadata and command arguments
+ *
+ * Return 0 on success or a negative errno.
+ */
+int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ const struct nlattr *attr;
+ struct nfsd_net *nn;
+ int i, rem;
+
+ if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_PROTO_VERSION))
+ return -EINVAL;
+
+ mutex_lock(&nfsd_mutex);
+
+ nn = net_generic(genl_info_net(info), nfsd_net_id);
+ if (nn->nfsd_serv) {
+ mutex_unlock(&nfsd_mutex);
+ return -EBUSY;
+ }
+
+ /* clear current supported versions. */
+ nfsd_vers(nn, 2, NFSD_CLEAR);
+ nfsd_vers(nn, 3, NFSD_CLEAR);
+ for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
+ nfsd_minorversion(nn, i, NFSD_CLEAR);
+
+ nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
+ struct nlattr *tb[NFSD_A_VERSION_MAX + 1];
+ u32 major, minor = 0;
+ bool enabled;
+
+ if (nla_type(attr) != NFSD_A_SERVER_PROTO_VERSION)
+ continue;
+
+ if (nla_parse_nested(tb, NFSD_A_VERSION_MAX, attr,
+ nfsd_version_nl_policy, info->extack) < 0)
+ continue;
+
+ if (!tb[NFSD_A_VERSION_MAJOR])
+ continue;
+
+ major = nla_get_u32(tb[NFSD_A_VERSION_MAJOR]);
+ if (tb[NFSD_A_VERSION_MINOR])
+ minor = nla_get_u32(tb[NFSD_A_VERSION_MINOR]);
+
+ enabled = nla_get_flag(tb[NFSD_A_VERSION_ENABLED]);
+
+ switch (major) {
+ case 4:
+ nfsd_minorversion(nn, minor, enabled ? NFSD_SET : NFSD_CLEAR);
+ break;
+ case 3:
+ case 2:
+ if (!minor)
+ nfsd_vers(nn, major, enabled ? NFSD_SET : NFSD_CLEAR);
+ break;
+ default:
+ break;
+ }
+ }
+
+ mutex_unlock(&nfsd_mutex);
+
+ return 0;
+}
+
+/**
+ * nfsd_nl_version_get_doit - get the nfs enabled versions
+ * @skb: reply buffer
+ * @info: netlink metadata and command arguments
+ *
+ * Return 0 on success or a negative errno.
+ */
+int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nfsd_net *nn;
+ int i, err;
+ void *hdr;
+
+ 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);
+
+ for (i = 2; i <= 4; i++) {
+ int j;
+
+ for (j = 0; j <= NFSD_SUPPORTED_MINOR_VERSION; j++) {
+ struct nlattr *attr;
+
+ /* Don't record any versions the kernel doesn't have
+ * compiled in
+ */
+ if (!nfsd_support_version(i))
+ continue;
+
+ /* NFSv{2,3} does not support minor numbers */
+ if (i < 4 && j)
+ continue;
+
+ if (i == 4 && !nfsd_minorversion(nn, j, NFSD_TEST))
+ continue;
+
+ attr = nla_nest_start_noflag(skb,
+ NFSD_A_SERVER_PROTO_VERSION);
+ if (!attr) {
+ err = -EINVAL;
+ goto err_nfsd_unlock;
+ }
+
+ if (nla_put_u32(skb, NFSD_A_VERSION_MAJOR, i) ||
+ nla_put_u32(skb, NFSD_A_VERSION_MINOR, j)) {
+ err = -EINVAL;
+ goto err_nfsd_unlock;
+ }
+
+ /* Set the enabled flag if the version is enabled */
+ if (nfsd_vers(nn, i, NFSD_TEST) &&
+ (i < 4 || nfsd_minorversion(nn, j, NFSD_TEST)) &&
+ nla_put_flag(skb, NFSD_A_VERSION_ENABLED)) {
+ err = -EINVAL;
+ goto err_nfsd_unlock;
+ }
+
+ nla_nest_end(skb, attr);
+ }
+ }
+
+ mutex_unlock(&nfsd_mutex);
+ genlmsg_end(skb, hdr);
+
+ return genlmsg_reply(skb, info);
+
+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/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index c0d17b92b249..4452a9bb9bbb 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -133,8 +133,7 @@ struct svc_program nfsd_program = {
.pg_rpcbind_set = nfsd_rpcbind_set,
};
-static bool
-nfsd_support_version(int vers)
+bool nfsd_support_version(int vers)
{
if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS)
return nfsd_version[vers] != NULL;
diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_netlink.h
index 1b6fe1f9ed0e..ccf3e15fe160 100644
--- a/include/uapi/linux/nfsd_netlink.h
+++ b/include/uapi/linux/nfsd_netlink.h
@@ -36,10 +36,28 @@ enum {
NFSD_A_SERVER_WORKER_MAX = (__NFSD_A_SERVER_WORKER_MAX - 1)
};
+enum {
+ NFSD_A_VERSION_MAJOR = 1,
+ NFSD_A_VERSION_MINOR,
+ NFSD_A_VERSION_ENABLED,
+
+ __NFSD_A_VERSION_MAX,
+ NFSD_A_VERSION_MAX = (__NFSD_A_VERSION_MAX - 1)
+};
+
+enum {
+ NFSD_A_SERVER_PROTO_VERSION = 1,
+
+ __NFSD_A_SERVER_PROTO_MAX,
+ NFSD_A_SERVER_PROTO_MAX = (__NFSD_A_SERVER_PROTO_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_MAX,
NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1)
--
2.44.0
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