| Message ID | fd54905f4d66b84afbc9a8270261d27ad509f0a0.1705771400.git.lorenzo@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | convert write_threads, write_version and write_ports to netlink commands | expand |
On Sat, 2024-01-20 at 18:33 +0100, Lorenzo Bianconi wrote: > Introduce write_version netlink command. For version-set, userspace is > expected to provide a NFS major/minor version list it wants to enable > (all the other ones will be disabled). > To be clear, this is a departure from how the existing interface works. The "versions" file was an imperative interface. You write "+3" to it, and that just enables v3. This is a declarative interface. If a version is not listed in the set, then it will be _disabled_. I think this is a better way to do it, given the way that rpc.nfsd works, but we should all be aware that this is a change in behavior. > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> > --- > Documentation/netlink/specs/nfsd.yaml | 34 +++++ > fs/nfsd/netlink.c | 23 ++++ > fs/nfsd/netlink.h | 5 + > fs/nfsd/nfsctl.c | 140 ++++++++++++++++++++ > include/uapi/linux/nfsd_netlink.h | 17 +++ > tools/net/ynl/generated/nfsd-user.c | 176 ++++++++++++++++++++++++++ > tools/net/ynl/generated/nfsd-user.h | 53 ++++++++ > 7 files changed, 448 insertions(+) > > diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/specs/nfsd.yaml > index c92e1425d316..30f18798e84e 100644 > --- a/Documentation/netlink/specs/nfsd.yaml > +++ b/Documentation/netlink/specs/nfsd.yaml > @@ -68,6 +68,23 @@ attribute-sets: > - > name: threads > type: u32 > + - > + name: nfs-version > + attributes: > + - > + name: major > + type: u32 > + - > + name: minor > + type: u32 > + - > + name: server-proto > + attributes: > + - > + name: version > + type: nest > + nested-attributes: nfs-version > + multi-attr: true > > operations: > list: > @@ -110,3 +127,20 @@ 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..5cbbd3295543 100644 > --- a/fs/nfsd/netlink.c > +++ b/fs/nfsd/netlink.c > @@ -10,11 +10,22 @@ > > #include <uapi/linux/nfsd_netlink.h> > > +/* Common nested types */ > +const struct nla_policy nfsd_nfs_version_nl_policy[NFSD_A_NFS_VERSION_MINOR + 1] = { > + [NFSD_A_NFS_VERSION_MAJOR] = { .type = NLA_U32, }, > + [NFSD_A_NFS_VERSION_MINOR] = { .type = NLA_U32, }, > +}; > + > /* 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_nfs_version_nl_policy), > +}; > + > /* Ops table for nfsd */ > static const struct genl_split_ops nfsd_nl_ops[] = { > { > @@ -36,6 +47,18 @@ 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..c9a1be693fef 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_nfs_version_nl_policy[NFSD_A_NFS_VERSION_MINOR + 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/nfsctl.c b/fs/nfsd/nfsctl.c > index 68718448d660..53af82303f93 100644 > --- a/fs/nfsd/nfsctl.c > +++ b/fs/nfsd/nfsctl.c > @@ -1756,6 +1756,146 @@ 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[ARRAY_SIZE(nfsd_nfs_version_nl_policy)]; > + u32 major, minor = 0; > + > + if (nla_type(attr) != NFSD_A_SERVER_PROTO_VERSION) > + continue; > + > + if (nla_parse_nested(tb, ARRAY_SIZE(tb), attr, > + nfsd_nfs_version_nl_policy, > + info->extack) < 0) > + continue; > + > + if (!tb[NFSD_A_NFS_VERSION_MAJOR]) > + continue; > + > + major = nla_get_u32(tb[NFSD_A_NFS_VERSION_MAJOR]); > + if (tb[NFSD_A_NFS_VERSION_MINOR]) > + minor = nla_get_u32(tb[NFSD_A_NFS_VERSION_MINOR]); > + > + switch (major) { > + case 4: > + nfsd_minorversion(nn, minor, NFSD_SET); > + break; > + case 3: > + case 2: > + if (!minor) > + nfsd_vers(nn, major, NFSD_SET); > + 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; > + > + if (!nfsd_vers(nn, i, NFSD_TEST)) > + 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_NFS_VERSION_MAJOR, i) || > + nla_put_u32(skb, NFSD_A_NFS_VERSION_MINOR, j)) { > + 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/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_netlink.h > index 1b6fe1f9ed0e..2a06f9fe6fe9 100644 > --- a/include/uapi/linux/nfsd_netlink.h > +++ b/include/uapi/linux/nfsd_netlink.h > @@ -36,10 +36,27 @@ enum { > NFSD_A_SERVER_WORKER_MAX = (__NFSD_A_SERVER_WORKER_MAX - 1) > }; > > +enum { > + NFSD_A_NFS_VERSION_MAJOR = 1, > + NFSD_A_NFS_VERSION_MINOR, > + > + __NFSD_A_NFS_VERSION_MAX, > + NFSD_A_NFS_VERSION_MAX = (__NFSD_A_NFS_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) > diff --git a/tools/net/ynl/generated/nfsd-user.c b/tools/net/ynl/generated/nfsd-user.c > index f4121a52ccf8..ad498543f464 100644 > --- a/tools/net/ynl/generated/nfsd-user.c > +++ b/tools/net/ynl/generated/nfsd-user.c > @@ -17,6 +17,8 @@ static const char * const nfsd_op_strmap[] = { > [NFSD_CMD_RPC_STATUS_GET] = "rpc-status-get", > [NFSD_CMD_THREADS_SET] = "threads-set", > [NFSD_CMD_THREADS_GET] = "threads-get", > + [NFSD_CMD_VERSION_SET] = "version-set", > + [NFSD_CMD_VERSION_GET] = "version-get", > }; > > const char *nfsd_op_str(int op) > @@ -27,6 +29,16 @@ const char *nfsd_op_str(int op) > } > > /* Policies */ > +struct ynl_policy_attr nfsd_nfs_version_policy[NFSD_A_NFS_VERSION_MAX + 1] = { > + [NFSD_A_NFS_VERSION_MAJOR] = { .name = "major", .type = YNL_PT_U32, }, > + [NFSD_A_NFS_VERSION_MINOR] = { .name = "minor", .type = YNL_PT_U32, }, > +}; > + > +struct ynl_policy_nest nfsd_nfs_version_nest = { > + .max_attr = NFSD_A_NFS_VERSION_MAX, > + .table = nfsd_nfs_version_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, }, > @@ -58,7 +70,60 @@ struct ynl_policy_nest nfsd_server_worker_nest = { > .table = nfsd_server_worker_policy, > }; > > +struct ynl_policy_attr nfsd_server_proto_policy[NFSD_A_SERVER_PROTO_MAX + 1] = { > + [NFSD_A_SERVER_PROTO_VERSION] = { .name = "version", .type = YNL_PT_NEST, .nest = &nfsd_nfs_version_nest, }, > +}; > + > +struct ynl_policy_nest nfsd_server_proto_nest = { > + .max_attr = NFSD_A_SERVER_PROTO_MAX, > + .table = nfsd_server_proto_policy, > +}; > + > /* Common nested types */ > +void nfsd_nfs_version_free(struct nfsd_nfs_version *obj) > +{ > +} > + > +int nfsd_nfs_version_put(struct nlmsghdr *nlh, unsigned int attr_type, > + struct nfsd_nfs_version *obj) > +{ > + struct nlattr *nest; > + > + nest = mnl_attr_nest_start(nlh, attr_type); > + if (obj->_present.major) > + mnl_attr_put_u32(nlh, NFSD_A_NFS_VERSION_MAJOR, obj->major); > + if (obj->_present.minor) > + mnl_attr_put_u32(nlh, NFSD_A_NFS_VERSION_MINOR, obj->minor); > + mnl_attr_nest_end(nlh, nest); > + > + return 0; > +} > + > +int nfsd_nfs_version_parse(struct ynl_parse_arg *yarg, > + const struct nlattr *nested) > +{ > + struct nfsd_nfs_version *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_NFS_VERSION_MAJOR) { > + if (ynl_attr_validate(yarg, attr)) > + return MNL_CB_ERROR; > + dst->_present.major = 1; > + dst->major = mnl_attr_get_u32(attr); > + } else if (type == NFSD_A_NFS_VERSION_MINOR) { > + if (ynl_attr_validate(yarg, attr)) > + return MNL_CB_ERROR; > + dst->_present.minor = 1; > + dst->minor = mnl_attr_get_u32(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) > @@ -291,6 +356,117 @@ struct nfsd_threads_get_rsp *nfsd_threads_get(struct ynl_sock *ys) > return NULL; > } > > +/* ============== NFSD_CMD_VERSION_SET ============== */ > +/* NFSD_CMD_VERSION_SET - do */ > +void nfsd_version_set_req_free(struct nfsd_version_set_req *req) > +{ > + unsigned int i; > + > + for (i = 0; i < req->n_version; i++) > + nfsd_nfs_version_free(&req->version[i]); > + free(req->version); > + free(req); > +} > + > +int nfsd_version_set(struct ynl_sock *ys, struct nfsd_version_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_VERSION_SET, 1); > + ys->req_policy = &nfsd_server_proto_nest; > + > + for (unsigned int i = 0; i < req->n_version; i++) > + nfsd_nfs_version_put(nlh, NFSD_A_SERVER_PROTO_VERSION, &req->version[i]); > + > + err = ynl_exec(ys, nlh, &yrs); > + if (err < 0) > + return -1; > + > + return 0; > +} > + > +/* ============== NFSD_CMD_VERSION_GET ============== */ > +/* NFSD_CMD_VERSION_GET - do */ > +void nfsd_version_get_rsp_free(struct nfsd_version_get_rsp *rsp) > +{ > + unsigned int i; > + > + for (i = 0; i < rsp->n_version; i++) > + nfsd_nfs_version_free(&rsp->version[i]); > + free(rsp->version); > + free(rsp); > +} > + > +int nfsd_version_get_rsp_parse(const struct nlmsghdr *nlh, void *data) > +{ > + struct ynl_parse_arg *yarg = data; > + struct nfsd_version_get_rsp *dst; > + unsigned int n_version = 0; > + const struct nlattr *attr; > + struct ynl_parse_arg parg; > + int i; > + > + dst = yarg->data; > + parg.ys = yarg->ys; > + > + if (dst->version) > + return ynl_error_parse(yarg, "attribute already present (server-proto.version)"); > + > + mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) { > + unsigned int type = mnl_attr_get_type(attr); > + > + if (type == NFSD_A_SERVER_PROTO_VERSION) { > + n_version++; > + } > + } > + > + if (n_version) { > + dst->version = calloc(n_version, sizeof(*dst->version)); > + dst->n_version = n_version; > + i = 0; > + parg.rsp_policy = &nfsd_nfs_version_nest; > + mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) { > + if (mnl_attr_get_type(attr) == NFSD_A_SERVER_PROTO_VERSION) { > + parg.data = &dst->version[i]; > + if (nfsd_nfs_version_parse(&parg, attr)) > + return MNL_CB_ERROR; > + i++; > + } > + } > + } > + > + return MNL_CB_OK; > +} > + > +struct nfsd_version_get_rsp *nfsd_version_get(struct ynl_sock *ys) > +{ > + struct ynl_req_state yrs = { .yarg = { .ys = ys, }, }; > + struct nfsd_version_get_rsp *rsp; > + struct nlmsghdr *nlh; > + int err; > + > + nlh = ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_VERSION_GET, 1); > + ys->req_policy = &nfsd_server_proto_nest; > + yrs.yarg.rsp_policy = &nfsd_server_proto_nest; > + > + rsp = calloc(1, sizeof(*rsp)); > + yrs.yarg.data = rsp; > + yrs.cb = nfsd_version_get_rsp_parse; > + yrs.rsp_cmd = NFSD_CMD_VERSION_GET; > + > + err = ynl_exec(ys, nlh, &yrs); > + if (err < 0) > + goto err_free; > + > + return rsp; > + > +err_free: > + nfsd_version_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 e162a4f20d91..d062ee8fa8b6 100644 > --- a/tools/net/ynl/generated/nfsd-user.h > +++ b/tools/net/ynl/generated/nfsd-user.h > @@ -19,6 +19,16 @@ extern const struct ynl_family ynl_nfsd_family; > const char *nfsd_op_str(int op); > > /* Common nested types */ > +struct nfsd_nfs_version { > + struct { > + __u32 major:1; > + __u32 minor:1; > + } _present; > + > + __u32 major; > + __u32 minor; > +}; > + > /* ============== NFSD_CMD_RPC_STATUS_GET ============== */ > /* NFSD_CMD_RPC_STATUS_GET - dump */ > struct nfsd_rpc_status_get_rsp_dump { > @@ -111,4 +121,47 @@ void nfsd_threads_get_rsp_free(struct nfsd_threads_get_rsp *rsp); > */ > struct nfsd_threads_get_rsp *nfsd_threads_get(struct ynl_sock *ys); > > +/* ============== NFSD_CMD_VERSION_SET ============== */ > +/* NFSD_CMD_VERSION_SET - do */ > +struct nfsd_version_set_req { > + unsigned int n_version; > + struct nfsd_nfs_version *version; > +}; > + > +static inline struct nfsd_version_set_req *nfsd_version_set_req_alloc(void) > +{ > + return calloc(1, sizeof(struct nfsd_version_set_req)); > +} > +void nfsd_version_set_req_free(struct nfsd_version_set_req *req); > + > +static inline void > +__nfsd_version_set_req_set_version(struct nfsd_version_set_req *req, > + struct nfsd_nfs_version *version, > + unsigned int n_version) > +{ > + free(req->version); > + req->version = version; > + req->n_version = n_version; > +} > + > +/* > + * set nfs enabled versions > + */ > +int nfsd_version_set(struct ynl_sock *ys, struct nfsd_version_set_req *req); > + > +/* ============== NFSD_CMD_VERSION_GET ============== */ > +/* NFSD_CMD_VERSION_GET - do */ > + > +struct nfsd_version_get_rsp { > + unsigned int n_version; > + struct nfsd_nfs_version *version; > +}; > + > +void nfsd_version_get_rsp_free(struct nfsd_version_get_rsp *rsp); > + > +/* > + * get nfs enabled versions > + */ > +struct nfsd_version_get_rsp *nfsd_version_get(struct ynl_sock *ys); > + > #endif /* _LINUX_NFSD_GEN_H */
diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/specs/nfsd.yaml index c92e1425d316..30f18798e84e 100644 --- a/Documentation/netlink/specs/nfsd.yaml +++ b/Documentation/netlink/specs/nfsd.yaml @@ -68,6 +68,23 @@ attribute-sets: - name: threads type: u32 + - + name: nfs-version + attributes: + - + name: major + type: u32 + - + name: minor + type: u32 + - + name: server-proto + attributes: + - + name: version + type: nest + nested-attributes: nfs-version + multi-attr: true operations: list: @@ -110,3 +127,20 @@ 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..5cbbd3295543 100644 --- a/fs/nfsd/netlink.c +++ b/fs/nfsd/netlink.c @@ -10,11 +10,22 @@ #include <uapi/linux/nfsd_netlink.h> +/* Common nested types */ +const struct nla_policy nfsd_nfs_version_nl_policy[NFSD_A_NFS_VERSION_MINOR + 1] = { + [NFSD_A_NFS_VERSION_MAJOR] = { .type = NLA_U32, }, + [NFSD_A_NFS_VERSION_MINOR] = { .type = NLA_U32, }, +}; + /* 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_nfs_version_nl_policy), +}; + /* Ops table for nfsd */ static const struct genl_split_ops nfsd_nl_ops[] = { { @@ -36,6 +47,18 @@ 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..c9a1be693fef 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_nfs_version_nl_policy[NFSD_A_NFS_VERSION_MINOR + 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/nfsctl.c b/fs/nfsd/nfsctl.c index 68718448d660..53af82303f93 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1756,6 +1756,146 @@ 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[ARRAY_SIZE(nfsd_nfs_version_nl_policy)]; + u32 major, minor = 0; + + if (nla_type(attr) != NFSD_A_SERVER_PROTO_VERSION) + continue; + + if (nla_parse_nested(tb, ARRAY_SIZE(tb), attr, + nfsd_nfs_version_nl_policy, + info->extack) < 0) + continue; + + if (!tb[NFSD_A_NFS_VERSION_MAJOR]) + continue; + + major = nla_get_u32(tb[NFSD_A_NFS_VERSION_MAJOR]); + if (tb[NFSD_A_NFS_VERSION_MINOR]) + minor = nla_get_u32(tb[NFSD_A_NFS_VERSION_MINOR]); + + switch (major) { + case 4: + nfsd_minorversion(nn, minor, NFSD_SET); + break; + case 3: + case 2: + if (!minor) + nfsd_vers(nn, major, NFSD_SET); + 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; + + if (!nfsd_vers(nn, i, NFSD_TEST)) + 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_NFS_VERSION_MAJOR, i) || + nla_put_u32(skb, NFSD_A_NFS_VERSION_MINOR, j)) { + 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/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_netlink.h index 1b6fe1f9ed0e..2a06f9fe6fe9 100644 --- a/include/uapi/linux/nfsd_netlink.h +++ b/include/uapi/linux/nfsd_netlink.h @@ -36,10 +36,27 @@ enum { NFSD_A_SERVER_WORKER_MAX = (__NFSD_A_SERVER_WORKER_MAX - 1) }; +enum { + NFSD_A_NFS_VERSION_MAJOR = 1, + NFSD_A_NFS_VERSION_MINOR, + + __NFSD_A_NFS_VERSION_MAX, + NFSD_A_NFS_VERSION_MAX = (__NFSD_A_NFS_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) diff --git a/tools/net/ynl/generated/nfsd-user.c b/tools/net/ynl/generated/nfsd-user.c index f4121a52ccf8..ad498543f464 100644 --- a/tools/net/ynl/generated/nfsd-user.c +++ b/tools/net/ynl/generated/nfsd-user.c @@ -17,6 +17,8 @@ static const char * const nfsd_op_strmap[] = { [NFSD_CMD_RPC_STATUS_GET] = "rpc-status-get", [NFSD_CMD_THREADS_SET] = "threads-set", [NFSD_CMD_THREADS_GET] = "threads-get", + [NFSD_CMD_VERSION_SET] = "version-set", + [NFSD_CMD_VERSION_GET] = "version-get", }; const char *nfsd_op_str(int op) @@ -27,6 +29,16 @@ const char *nfsd_op_str(int op) } /* Policies */ +struct ynl_policy_attr nfsd_nfs_version_policy[NFSD_A_NFS_VERSION_MAX + 1] = { + [NFSD_A_NFS_VERSION_MAJOR] = { .name = "major", .type = YNL_PT_U32, }, + [NFSD_A_NFS_VERSION_MINOR] = { .name = "minor", .type = YNL_PT_U32, }, +}; + +struct ynl_policy_nest nfsd_nfs_version_nest = { + .max_attr = NFSD_A_NFS_VERSION_MAX, + .table = nfsd_nfs_version_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, }, @@ -58,7 +70,60 @@ struct ynl_policy_nest nfsd_server_worker_nest = { .table = nfsd_server_worker_policy, }; +struct ynl_policy_attr nfsd_server_proto_policy[NFSD_A_SERVER_PROTO_MAX + 1] = { + [NFSD_A_SERVER_PROTO_VERSION] = { .name = "version", .type = YNL_PT_NEST, .nest = &nfsd_nfs_version_nest, }, +}; + +struct ynl_policy_nest nfsd_server_proto_nest = { + .max_attr = NFSD_A_SERVER_PROTO_MAX, + .table = nfsd_server_proto_policy, +}; + /* Common nested types */ +void nfsd_nfs_version_free(struct nfsd_nfs_version *obj) +{ +} + +int nfsd_nfs_version_put(struct nlmsghdr *nlh, unsigned int attr_type, + struct nfsd_nfs_version *obj) +{ + struct nlattr *nest; + + nest = mnl_attr_nest_start(nlh, attr_type); + if (obj->_present.major) + mnl_attr_put_u32(nlh, NFSD_A_NFS_VERSION_MAJOR, obj->major); + if (obj->_present.minor) + mnl_attr_put_u32(nlh, NFSD_A_NFS_VERSION_MINOR, obj->minor); + mnl_attr_nest_end(nlh, nest); + + return 0; +} + +int nfsd_nfs_version_parse(struct ynl_parse_arg *yarg, + const struct nlattr *nested) +{ + struct nfsd_nfs_version *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_NFS_VERSION_MAJOR) { + if (ynl_attr_validate(yarg, attr)) + return MNL_CB_ERROR; + dst->_present.major = 1; + dst->major = mnl_attr_get_u32(attr); + } else if (type == NFSD_A_NFS_VERSION_MINOR) { + if (ynl_attr_validate(yarg, attr)) + return MNL_CB_ERROR; + dst->_present.minor = 1; + dst->minor = mnl_attr_get_u32(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) @@ -291,6 +356,117 @@ struct nfsd_threads_get_rsp *nfsd_threads_get(struct ynl_sock *ys) return NULL; } +/* ============== NFSD_CMD_VERSION_SET ============== */ +/* NFSD_CMD_VERSION_SET - do */ +void nfsd_version_set_req_free(struct nfsd_version_set_req *req) +{ + unsigned int i; + + for (i = 0; i < req->n_version; i++) + nfsd_nfs_version_free(&req->version[i]); + free(req->version); + free(req); +} + +int nfsd_version_set(struct ynl_sock *ys, struct nfsd_version_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_VERSION_SET, 1); + ys->req_policy = &nfsd_server_proto_nest; + + for (unsigned int i = 0; i < req->n_version; i++) + nfsd_nfs_version_put(nlh, NFSD_A_SERVER_PROTO_VERSION, &req->version[i]); + + err = ynl_exec(ys, nlh, &yrs); + if (err < 0) + return -1; + + return 0; +} + +/* ============== NFSD_CMD_VERSION_GET ============== */ +/* NFSD_CMD_VERSION_GET - do */ +void nfsd_version_get_rsp_free(struct nfsd_version_get_rsp *rsp) +{ + unsigned int i; + + for (i = 0; i < rsp->n_version; i++) + nfsd_nfs_version_free(&rsp->version[i]); + free(rsp->version); + free(rsp); +} + +int nfsd_version_get_rsp_parse(const struct nlmsghdr *nlh, void *data) +{ + struct ynl_parse_arg *yarg = data; + struct nfsd_version_get_rsp *dst; + unsigned int n_version = 0; + const struct nlattr *attr; + struct ynl_parse_arg parg; + int i; + + dst = yarg->data; + parg.ys = yarg->ys; + + if (dst->version) + return ynl_error_parse(yarg, "attribute already present (server-proto.version)"); + + mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) { + unsigned int type = mnl_attr_get_type(attr); + + if (type == NFSD_A_SERVER_PROTO_VERSION) { + n_version++; + } + } + + if (n_version) { + dst->version = calloc(n_version, sizeof(*dst->version)); + dst->n_version = n_version; + i = 0; + parg.rsp_policy = &nfsd_nfs_version_nest; + mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) { + if (mnl_attr_get_type(attr) == NFSD_A_SERVER_PROTO_VERSION) { + parg.data = &dst->version[i]; + if (nfsd_nfs_version_parse(&parg, attr)) + return MNL_CB_ERROR; + i++; + } + } + } + + return MNL_CB_OK; +} + +struct nfsd_version_get_rsp *nfsd_version_get(struct ynl_sock *ys) +{ + struct ynl_req_state yrs = { .yarg = { .ys = ys, }, }; + struct nfsd_version_get_rsp *rsp; + struct nlmsghdr *nlh; + int err; + + nlh = ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_VERSION_GET, 1); + ys->req_policy = &nfsd_server_proto_nest; + yrs.yarg.rsp_policy = &nfsd_server_proto_nest; + + rsp = calloc(1, sizeof(*rsp)); + yrs.yarg.data = rsp; + yrs.cb = nfsd_version_get_rsp_parse; + yrs.rsp_cmd = NFSD_CMD_VERSION_GET; + + err = ynl_exec(ys, nlh, &yrs); + if (err < 0) + goto err_free; + + return rsp; + +err_free: + nfsd_version_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 e162a4f20d91..d062ee8fa8b6 100644 --- a/tools/net/ynl/generated/nfsd-user.h +++ b/tools/net/ynl/generated/nfsd-user.h @@ -19,6 +19,16 @@ extern const struct ynl_family ynl_nfsd_family; const char *nfsd_op_str(int op); /* Common nested types */ +struct nfsd_nfs_version { + struct { + __u32 major:1; + __u32 minor:1; + } _present; + + __u32 major; + __u32 minor; +}; + /* ============== NFSD_CMD_RPC_STATUS_GET ============== */ /* NFSD_CMD_RPC_STATUS_GET - dump */ struct nfsd_rpc_status_get_rsp_dump { @@ -111,4 +121,47 @@ void nfsd_threads_get_rsp_free(struct nfsd_threads_get_rsp *rsp); */ struct nfsd_threads_get_rsp *nfsd_threads_get(struct ynl_sock *ys); +/* ============== NFSD_CMD_VERSION_SET ============== */ +/* NFSD_CMD_VERSION_SET - do */ +struct nfsd_version_set_req { + unsigned int n_version; + struct nfsd_nfs_version *version; +}; + +static inline struct nfsd_version_set_req *nfsd_version_set_req_alloc(void) +{ + return calloc(1, sizeof(struct nfsd_version_set_req)); +} +void nfsd_version_set_req_free(struct nfsd_version_set_req *req); + +static inline void +__nfsd_version_set_req_set_version(struct nfsd_version_set_req *req, + struct nfsd_nfs_version *version, + unsigned int n_version) +{ + free(req->version); + req->version = version; + req->n_version = n_version; +} + +/* + * set nfs enabled versions + */ +int nfsd_version_set(struct ynl_sock *ys, struct nfsd_version_set_req *req); + +/* ============== NFSD_CMD_VERSION_GET ============== */ +/* NFSD_CMD_VERSION_GET - do */ + +struct nfsd_version_get_rsp { + unsigned int n_version; + struct nfsd_nfs_version *version; +}; + +void nfsd_version_get_rsp_free(struct nfsd_version_get_rsp *rsp); + +/* + * get nfs enabled versions + */ +struct nfsd_version_get_rsp *nfsd_version_get(struct ynl_sock *ys); + #endif /* _LINUX_NFSD_GEN_H */
Introduce write_version netlink command. For version-set, userspace is expected to provide a NFS major/minor version list it wants to enable (all the other ones will be disabled). Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> --- Documentation/netlink/specs/nfsd.yaml | 34 +++++ fs/nfsd/netlink.c | 23 ++++ fs/nfsd/netlink.h | 5 + fs/nfsd/nfsctl.c | 140 ++++++++++++++++++++ include/uapi/linux/nfsd_netlink.h | 17 +++ tools/net/ynl/generated/nfsd-user.c | 176 ++++++++++++++++++++++++++ tools/net/ynl/generated/nfsd-user.h | 53 ++++++++ 7 files changed, 448 insertions(+)