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genetlink: add genlmsg_iput() API

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Add some APIs and helpers required for convenient construction
of replies and notifications based on struct genl_info.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20230814214723.2924989-8-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-08-14 14:47:20 -07:00
parent 5c670a010d
commit 5aa51d9f88
1 changed files with 53 additions and 1 deletions
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54
include/net/genetlink.h
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@ -113,7 +113,7 @@ struct genl_info {
struct netlink_ext_ack *extack;
};
static inline struct net *genl_info_net(struct genl_info *info)
static inline struct net *genl_info_net(const struct genl_info *info)
{
return read_pnet(&info->_net);
}
@ -270,6 +270,32 @@ genl_info_dump(struct netlink_callback *cb)
return &genl_dumpit_info(cb)->info;
}
/**
* genl_info_init_ntf() - initialize genl_info for notifications
* @info: genl_info struct to set up
* @family: pointer to the genetlink family
* @cmd: command to be used in the notification
*
* Initialize a locally declared struct genl_info to pass to various APIs.
* Intended to be used when creating notifications.
*/
static inline void
genl_info_init_ntf(struct genl_info *info, const struct genl_family *family,
u8 cmd)
{
struct genlmsghdr *hdr = (void *) &info->user_ptr[0];
memset(info, 0, sizeof(*info));
info->family = family;
info->genlhdr = hdr;
hdr->cmd = cmd;
}
static inline bool genl_info_is_ntf(const struct genl_info *info)
{
return !info->nlhdr;
}
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,
@ -278,6 +304,32 @@ void genl_notify(const struct genl_family *family, struct sk_buff *skb,
void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
const struct genl_family *family, int flags, u8 cmd);
static inline void *
__genlmsg_iput(struct sk_buff *skb, const struct genl_info *info, int flags)
{
return genlmsg_put(skb, info->snd_portid, info->snd_seq, info->family,
flags, info->genlhdr->cmd);
}
/**
* genlmsg_iput - start genetlink message based on genl_info
* @skb: skb in which message header will be placed
* @info: genl_info as provided to do/dump handlers
*
* Convenience wrapper which starts a genetlink message based on
* information in user request. @info should be either the struct passed
* by genetlink core to do/dump handlers (when constructing replies to
* such requests) or a struct initialized by genl_info_init_ntf()
* when constructing notifications.
*
* Returns pointer to new genetlink header.
*/
static inline void *
genlmsg_iput(struct sk_buff *skb, const struct genl_info *info)
{
return __genlmsg_iput(skb, info, 0);
}
/**
* genlmsg_nlhdr - Obtain netlink header from user specified header
* @user_hdr: user header as returned from genlmsg_put()