diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 4be7989c451b..d21210709f84 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -46,6 +46,9 @@ struct genl_info;
* @n_ops: number of operations supported by this family
* @small_ops: the small-struct operations supported by this family
* @n_small_ops: number of small-struct operations supported by this family
+ * @split_ops: the split do/dump form of operation definition
+ * @n_split_ops: number of entries in @split_ops, not that with split do/dump
+ * ops the number of entries is not the same as number of commands
*
* Attribute policies (the combination of @policy and @maxattr fields)
* can be attached at the family level or at the operation level.
@@ -63,6 +66,7 @@ struct genl_family {
u8 parallel_ops:1;
u8 n_ops;
u8 n_small_ops;
+ u8 n_split_ops;
u8 n_mcgrps;
u8 resv_start_op;
const struct nla_policy *policy;
@@ -74,6 +78,7 @@ struct genl_family {
struct genl_info *info);
const struct genl_ops * ops;
const struct genl_small_ops *small_ops;
+ const struct genl_split_ops *split_ops;
const struct genl_multicast_group *mcgrps;
struct module *module;
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 0a4f1470f442..90b0feb5eb73 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -101,6 +101,17 @@ genl_op_fill_in_reject_policy(const struct genl_family *family,
op->maxattr = 1;
}
+static void
+genl_op_fill_in_reject_policy_split(const struct genl_family *family,
+ struct genl_split_ops *op)
+{
+ if (op->policy)
+ return;
+
+ op->policy = genl_policy_reject_all;
+ op->maxattr = 1;
+}
+
static const struct genl_family *genl_family_find_byid(unsigned int id)
{
return idr_find(&genl_fam_idr, id);
@@ -118,6 +129,16 @@ static const struct genl_family *genl_family_find_byname(char *name)
return NULL;
}
+struct genl_op_iter {
+ const struct genl_family *family;
+ struct genl_split_ops doit;
+ struct genl_split_ops dumpit;
+ int cmd_idx;
+ int entry_idx;
+ u32 cmd;
+ u8 flags;
+};
+
static void genl_op_from_full(const struct genl_family *family,
unsigned int i, struct genl_ops *op)
{
@@ -176,6 +197,50 @@ static int genl_get_cmd_small(u32 cmd, const struct genl_family *family,
return -ENOENT;
}
+static void genl_op_from_split(struct genl_op_iter *iter)
+{
+ const struct genl_family *family = iter->family;
+ int i, cnt = 0;
+
+ i = iter->entry_idx - family->n_ops - family->n_small_ops;
+
+ if (family->split_ops[i + cnt].flags & GENL_CMD_CAP_DO) {
+ iter->doit = family->split_ops[i + cnt];
+ genl_op_fill_in_reject_policy_split(family, &iter->doit);
+ cnt++;
+ } else {
+ memset(&iter->doit, 0, sizeof(iter->doit));
+ }
+
+ if (i + cnt < family->n_split_ops &&
+ family->split_ops[i + cnt].flags & GENL_CMD_CAP_DUMP) {
+ iter->dumpit = family->split_ops[i + cnt];
+ genl_op_fill_in_reject_policy_split(family, &iter->dumpit);
+ cnt++;
+ } else {
+ memset(&iter->dumpit, 0, sizeof(iter->dumpit));
+ }
+
+ WARN_ON(!cnt);
+ iter->entry_idx += cnt;
+}
+
+static int
+genl_get_cmd_split(u32 cmd, u8 flag, const struct genl_family *family,
+ struct genl_split_ops *op)
+{
+ int i;
+
+ for (i = 0; i < family->n_split_ops; i++)
+ if (family->split_ops[i].cmd == cmd &&
+ family->split_ops[i].flags & flag) {
+ *op = family->split_ops[i];
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
static int
genl_cmd_full_to_split(struct genl_split_ops *op,
const struct genl_family *family,
@@ -227,50 +292,60 @@ genl_get_cmd(u32 cmd, u8 flags, const struct genl_family *family,
err = genl_get_cmd_full(cmd, family, &full);
if (err == -ENOENT)
err = genl_get_cmd_small(cmd, family, &full);
- if (err) {
+ /* Found one of legacy forms */
+ if (err == 0)
+ return genl_cmd_full_to_split(op, family, &full, flags);
+
+ err = genl_get_cmd_split(cmd, flags, family, op);
+ if (err)
memset(op, 0, sizeof(*op));
- return err;
- }
-
- return genl_cmd_full_to_split(op, family, &full, flags);
+ return err;
}
-struct genl_op_iter {
- const struct genl_family *family;
- struct genl_split_ops doit;
- struct genl_split_ops dumpit;
- int i;
- u32 cmd;
- u8 flags;
-};
-
static bool
genl_op_iter_init(const struct genl_family *family, struct genl_op_iter *iter)
{
iter->family = family;
- iter->i = 0;
+ iter->cmd_idx = 0;
+ iter->entry_idx = 0;
iter->flags = 0;
- return iter->family->n_ops + iter->family->n_small_ops;
+ return iter->family->n_ops +
+ iter->family->n_small_ops +
+ iter->family->n_split_ops;
}
static bool genl_op_iter_next(struct genl_op_iter *iter)
{
const struct genl_family *family = iter->family;
+ bool legacy_op = true;
struct genl_ops op;
- if (iter->i < family->n_ops)
- genl_op_from_full(family, iter->i, &op);
- else if (iter->i < family->n_ops + family->n_small_ops)
- genl_op_from_small(family, iter->i - family->n_ops, &op);
- else
+ if (iter->entry_idx < family->n_ops) {
+ genl_op_from_full(family, iter->entry_idx, &op);
+ } else if (iter->entry_idx < family->n_ops + family->n_small_ops) {
+ genl_op_from_small(family, iter->entry_idx - family->n_ops,
+ &op);
+ } else if (iter->entry_idx <
+ family->n_ops + family->n_small_ops + family->n_split_ops) {
+ legacy_op = false;
+ /* updates entry_idx */
+ genl_op_from_split(iter);
+ } else {
return false;
+ }
- iter->i++;
+ iter->cmd_idx++;
- genl_cmd_full_to_split(&iter->doit, family, &op, GENL_CMD_CAP_DO);
- genl_cmd_full_to_split(&iter->dumpit, family, &op, GENL_CMD_CAP_DUMP);
+ if (legacy_op) {
+ iter->entry_idx++;
+
+ genl_cmd_full_to_split(&iter->doit, family,
+ &op, GENL_CMD_CAP_DO);
+ genl_cmd_full_to_split(&iter->dumpit, family,
+ &op, GENL_CMD_CAP_DUMP);
+ }
iter->cmd = iter->doit.cmd | iter->dumpit.cmd;
iter->flags = iter->doit.flags | iter->dumpit.flags;
@@ -286,7 +361,7 @@ genl_op_iter_copy(struct genl_op_iter *dst, struct genl_op_iter *src)
static unsigned int genl_op_iter_idx(struct genl_op_iter *iter)
{
- return iter->i;
+ return iter->cmd_idx;
}
static int genl_allocate_reserve_groups(int n_groups, int *first_id)
@@ -454,12 +529,22 @@ static void genl_unregister_mc_groups(const struct genl_family *family)
}
}
+static bool genl_split_op_check(const struct genl_split_ops *op)
+{
+ if (WARN_ON(hweight8(op->flags & (GENL_CMD_CAP_DO |
+ GENL_CMD_CAP_DUMP)) != 1))
+ return true;
+ return false;
+}
+
static int genl_validate_ops(const struct genl_family *family)
{
struct genl_op_iter i, j;
+ unsigned int s;
if (WARN_ON(family->n_ops && !family->ops) ||
- WARN_ON(family->n_small_ops && !family->small_ops))
+ WARN_ON(family->n_small_ops && !family->small_ops) ||
+ WARN_ON(family->n_split_ops && !family->split_ops))
return -EINVAL;
for (genl_op_iter_init(family, &i); genl_op_iter_next(&i); ) {
@@ -477,6 +562,39 @@ static int genl_validate_ops(const struct genl_family *family)
}
}
+ if (family->n_split_ops) {
+ if (genl_split_op_check(&family->split_ops[0]))
+ return -EINVAL;
+ }
+
+ for (s = 1; s < family->n_split_ops; s++) {
+ const struct genl_split_ops *a, *b;
+
+ a = &family->split_ops[s - 1];
+ b = &family->split_ops[s];
+
+ if (genl_split_op_check(b))
+ return -EINVAL;
+
+ /* Check sort order */
+ if (a->cmd < b->cmd)
+ continue;
+
+ if (a->internal_flags != b->internal_flags ||
+ ((a->flags ^ b->flags) & ~(GENL_CMD_CAP_DO |
+ GENL_CMD_CAP_DUMP))) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ if ((a->flags & GENL_CMD_CAP_DO) &&
+ (b->flags & GENL_CMD_CAP_DUMP))
+ continue;
+
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
return 0;
}