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Subject[PATCH 06/13] drbd: Also need to check for DRBD_GENLA_F_MANDATORY flags before nla_find_nested()
Date
From: Andreas Gruenbacher <agruen@linbit.com>

This is done by introducing drbd_nla_find_nested() which handles the flag
before calling nla_find_nested().

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_int.h | 6 +++
drivers/block/drbd/drbd_nl.c | 96 +++++++++++++++++++++++++++++++--------
include/linux/drbd_genl.h | 2 +-
include/linux/genl_magic_func.h | 37 ---------------
4 files changed, 83 insertions(+), 58 deletions(-)

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index c301973..c584301 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1407,6 +1407,12 @@ extern bool conn_try_outdate_peer(struct drbd_tconn *tconn);
extern void conn_try_outdate_peer_async(struct drbd_tconn *tconn);
extern int drbd_khelper(struct drbd_conf *mdev, char *cmd);

+struct nla_policy;
+extern int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla);
+extern int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
+ const struct nla_policy *policy);
+extern struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype);
+
/* drbd_worker.c */
extern int drbd_worker(struct drbd_thread *thi);
enum drbd_ret_code drbd_resync_after_valid(struct drbd_conf *mdev, int o_minor);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 8be3bef..b75fde7 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -116,7 +116,7 @@ static struct drbd_config_context {
#define VOLUME_UNSPECIFIED (-1U)
/* pointer into the request skb,
* limited lifetime! */
- char *conn_name;
+ char *resource_name;

/* reply buffer */
struct sk_buff *reply_skb;
@@ -215,15 +215,15 @@ static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
/* and assign stuff to the global adm_ctx */
nla = nested_attr_tb[__nla_type(T_ctx_volume)];
adm_ctx.volume = nla ? nla_get_u32(nla) : VOLUME_UNSPECIFIED;
- nla = nested_attr_tb[__nla_type(T_ctx_conn_name)];
+ nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
if (nla)
- adm_ctx.conn_name = nla_data(nla);
+ adm_ctx.resource_name = nla_data(nla);
} else
adm_ctx.volume = VOLUME_UNSPECIFIED;

adm_ctx.minor = d_in->minor;
adm_ctx.mdev = minor_to_mdev(d_in->minor);
- adm_ctx.tconn = conn_get_by_name(adm_ctx.conn_name);
+ adm_ctx.tconn = conn_get_by_name(adm_ctx.resource_name);

if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
drbd_msg_put_info("unknown minor");
@@ -238,7 +238,8 @@ static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
if (adm_ctx.mdev && adm_ctx.tconn &&
adm_ctx.mdev->tconn != adm_ctx.tconn) {
pr_warning("request: minor=%u, conn=%s; but that minor belongs to connection %s\n",
- adm_ctx.minor, adm_ctx.conn_name, adm_ctx.mdev->tconn->name);
+ adm_ctx.minor, adm_ctx.resource_name,
+ adm_ctx.mdev->tconn->name);
drbd_msg_put_info("minor exists in different connection");
return ERR_INVALID_REQUEST;
}
@@ -263,7 +264,7 @@ fail:
static int drbd_adm_finish(struct genl_info *info, int retcode)
{
struct nlattr *nla;
- const char *conn_name = NULL;
+ const char *resource_name = NULL;

if (adm_ctx.tconn) {
kref_put(&adm_ctx.tconn->kref, &conn_destroy);
@@ -277,9 +278,10 @@ static int drbd_adm_finish(struct genl_info *info, int retcode)

nla = info->attrs[DRBD_NLA_CFG_CONTEXT];
if (nla) {
- nla = nla_find_nested(nla, __nla_type(T_ctx_conn_name));
- if (nla)
- conn_name = nla_data(nla);
+ int maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
+ nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
+ if (nla && !IS_ERR(nla))
+ resource_name = nla_data(nla);
}

drbd_adm_send_reply(adm_ctx.reply_skb, info);
@@ -2575,7 +2577,7 @@ int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
}

-int nla_put_drbd_cfg_context(struct sk_buff *skb, const char *conn_name, unsigned vnr)
+int nla_put_drbd_cfg_context(struct sk_buff *skb, const char *resource_name, unsigned vnr)
{
struct nlattr *nla;
nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
@@ -2583,7 +2585,7 @@ int nla_put_drbd_cfg_context(struct sk_buff *skb, const char *conn_name, unsigne
goto nla_put_failure;
if (vnr != VOLUME_UNSPECIFIED)
NLA_PUT_U32(skb, T_ctx_volume, vnr);
- NLA_PUT_STRING(skb, T_ctx_conn_name, conn_name);
+ NLA_PUT_STRING(skb, T_ctx_resource_name, resource_name);
nla_nest_end(skb, nla);
return 0;

@@ -2827,8 +2829,9 @@ int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
{
const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
struct nlattr *nla;
- const char *conn_name;
+ const char *resource_name;
struct drbd_tconn *tconn;
+ int maxtype;

/* Is this a followup call? */
if (cb->args[0]) {
@@ -2848,12 +2851,15 @@ int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
/* No explicit context given. Dump all. */
if (!nla)
goto dump;
- nla = nla_find_nested(nla, __nla_type(T_ctx_conn_name));
+ maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
+ nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
+ if (IS_ERR(nla))
+ return PTR_ERR(nla);
/* context given, but no name present? */
if (!nla)
return -EINVAL;
- conn_name = nla_data(nla);
- tconn = conn_get_by_name(conn_name);
+ resource_name = nla_data(nla);
+ tconn = conn_get_by_name(resource_name);

if (!tconn)
return -ENODEV;
@@ -3006,16 +3012,16 @@ out_nolock:
}

static enum drbd_ret_code
-drbd_check_conn_name(const char *name)
+drbd_check_resource_name(const char *name)
{
if (!name || !name[0]) {
- drbd_msg_put_info("connection name missing");
+ drbd_msg_put_info("resource name missing");
return ERR_MANDATORY_TAG;
}
/* if we want to use these in sysfs/configfs/debugfs some day,
* we must not allow slashes */
if (strchr(name, '/')) {
- drbd_msg_put_info("invalid connection name");
+ drbd_msg_put_info("invalid resource name");
return ERR_INVALID_REQUEST;
}
return NO_ERROR;
@@ -3031,7 +3037,7 @@ int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
if (retcode != NO_ERROR)
goto out;

- retcode = drbd_check_conn_name(adm_ctx.conn_name);
+ retcode = drbd_check_resource_name(adm_ctx.resource_name);
if (retcode != NO_ERROR)
goto out;

@@ -3044,7 +3050,7 @@ int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
goto out;
}

- if (!conn_create(adm_ctx.conn_name))
+ if (!conn_create(adm_ctx.resource_name))
retcode = ERR_NOMEM;
out:
drbd_adm_finish(info, retcode);
@@ -3260,3 +3266,53 @@ failed:
"Event seq:%u sib_reason:%u\n",
err, seq, sib->sib_reason);
}
+
+int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla)
+{
+ struct nlattr *head = nla_data(nla);
+ int len = nla_len(nla);
+ int rem;
+
+ /*
+ * validate_nla (called from nla_parse_nested) ignores attributes
+ * beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag.
+ * In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY
+ * flag set also, check and remove that flag before calling
+ * nla_parse_nested.
+ */
+
+ nla_for_each_attr(nla, head, len, rem) {
+ if (nla->nla_type & DRBD_GENLA_F_MANDATORY) {
+ nla->nla_type &= ~DRBD_GENLA_F_MANDATORY;
+ if (nla_type(nla) > maxtype)
+ return -EOPNOTSUPP;
+ }
+ }
+ return 0;
+}
+
+int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
+ const struct nla_policy *policy)
+{
+ int err;
+
+ err = drbd_nla_check_mandatory(maxtype, nla);
+ if (!err)
+ err = nla_parse_nested(tb, maxtype, nla, policy);
+
+ return err;
+}
+
+struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype)
+{
+ int err;
+ /*
+ * If any nested attribute has the DRBD_GENLA_F_MANDATORY flag set and
+ * we don't know about that attribute, reject all the nested
+ * attributes.
+ */
+ err = drbd_nla_check_mandatory(maxtype, nla);
+ if (err)
+ return ERR_PTR(err);
+ return nla_find_nested(nla, attrtype);
+}
diff --git a/include/linux/drbd_genl.h b/include/linux/drbd_genl.h
index 47ef324..0c2102c 100644
--- a/include/linux/drbd_genl.h
+++ b/include/linux/drbd_genl.h
@@ -96,7 +96,7 @@ GENL_struct(DRBD_NLA_CFG_REPLY, 1, drbd_cfg_reply,
* and the volume id within the resource. */
GENL_struct(DRBD_NLA_CFG_CONTEXT, 2, drbd_cfg_context,
__u32_field(1, DRBD_GENLA_F_MANDATORY, ctx_volume)
- __str_field(2, DRBD_GENLA_F_MANDATORY, ctx_conn_name, 128)
+ __str_field(2, DRBD_GENLA_F_MANDATORY, ctx_resource_name, 128)
)

GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
diff --git a/include/linux/genl_magic_func.h b/include/linux/genl_magic_func.h
index 2d38695..a0bb87f 100644
--- a/include/linux/genl_magic_func.h
+++ b/include/linux/genl_magic_func.h
@@ -142,43 +142,6 @@ static struct nlattr *nested_attr_tb[128];
#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
#endif

-static inline int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla)
-{
- struct nlattr *head = nla_data(nla);
- int len = nla_len(nla);
- int rem;
-
- /*
- * validate_nla (called from nla_parse_nested) ignores attributes
- * beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag.
- * In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY
- * flag set also, check and remove that flag before calling
- * nla_parse_nested.
- */
-
- nla_for_each_attr(nla, head, len, rem) {
- if (nla->nla_type & DRBD_GENLA_F_MANDATORY) {
- nla->nla_type &= ~DRBD_GENLA_F_MANDATORY;
- if (nla_type(nla) > maxtype)
- return -EOPNOTSUPP;
- }
- }
- return 0;
-}
-
-static inline int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype,
- struct nlattr *nla,
- const struct nla_policy *policy)
-{
- int err;
-
- err = drbd_nla_check_mandatory(maxtype, nla);
- if (!err)
- err = nla_parse_nested(tb, maxtype, nla, policy);
-
- return err;
-}
-
#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields) \
static int s_name ## _from_attrs(struct s_name *s, struct genl_info *info) __attribute__((unused)); \
--
1.7.4.1


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