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genetlink: add struct genl_info to struct genl_dumpit_info 

Netlink GET implementations must currently juggle struct genl_info
and struct netlink_callback, depending on whether they were called
from doit or dumpit.

Add genl_info to the dump state and populate the fields.
This way implementations can simply pass struct genl_info around.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20230814214723.2924989-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-08-14 14:47:17 -07:00
parent bffcc6882a
commit 9272af109f
2 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/net/genetlink.h
View File

@ -250,11 +250,13 @@ struct genl_split_ops {
* @family: generic netlink family - for internal genl code usage
* @op: generic netlink ops - for internal genl code usage
* @attrs: netlink attributes
* @info: struct genl_info describing the request
*/
struct genl_dumpit_info {
const struct genl_family *family;
struct genl_split_ops op;
struct nlattr **attrs;
struct genl_info info;
};
static inline const struct genl_dumpit_info *
@ -263,6 +265,12 @@ genl_dumpit_info(struct netlink_callback *cb)
return cb->data;
}
static inline const struct genl_info *
genl_info_dump(struct netlink_callback *cb)
{
return &genl_dumpit_info(cb)->info;
}
int genl_register_family(struct genl_family *family);
int genl_unregister_family(const struct genl_family *family);
void genl_notify(const struct genl_family *family, struct sk_buff *skb,

16
net/netlink/genetlink.c
View File

@ -847,6 +847,14 @@ static int genl_start(struct netlink_callback *cb)
info->family = ctx->family;
info->op = *ops;
info->attrs = attrs;
info->info.snd_seq = cb->nlh->nlmsg_seq;
info->info.snd_portid = NETLINK_CB(cb->skb).portid;
info->info.nlhdr = cb->nlh;
info->info.genlhdr = nlmsg_data(cb->nlh);
info->info.attrs = attrs;
genl_info_net_set(&info->info, sock_net(cb->skb->sk));
info->info.extack = cb->extack;
memset(&info->info.user_ptr, 0, sizeof(info->info.user_ptr));
cb->data = info;
if (ops->start) {
@ -865,10 +873,12 @@ static int genl_start(struct netlink_callback *cb)
static int genl_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
struct genl_dumpit_info *info = cb->data;
const struct genl_split_ops *ops = &info->op;
int rc;
info->info.extack = cb->extack;
genl_op_lock(info->family);
rc = ops->dumpit(skb, cb);
genl_op_unlock(info->family);
@ -877,10 +887,12 @@ static int genl_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
static int genl_done(struct netlink_callback *cb)
{
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
struct genl_dumpit_info *info = cb->data;
const struct genl_split_ops *ops = &info->op;
int rc = 0;
info->info.extack = cb->extack;
if (ops->done) {
genl_op_lock(info->family);
rc = ops->done(cb);