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linux/drivers/block/drbd/drbd_nl_gen.h
Christoph Böhmwalder 8098eeb693 drbd: replace genl_magic with explicit netlink serialization 
Replace the genl_magic multi-include macro system with explicit
serialization and parsing.

The *_gen files were initially produced from a YNL spec via a
customized ynl-gen-c, but the DRBD netlink family is effectively
frozen, so the generator is kept unmodified.
All new functionality will land in a separate, properly-designed
family.
Carry the resulting code as ordinary in-tree source rather than
landing the spec and generator changes that produced it.

The bulk of the changes are mechanical renames to fit the YNL naming
conventions:
  - Handler functions: drbd_adm_* -> drbd_nl_*_doit/dumpit
  - GENL_MAGIC_VERSION -> DRBD_FAMILY_VERSION
  - GENL_MAGIC_FAMILY_HDRSZ -> sizeof(struct drbd_genlmsghdr)
  - drbd_genl_family -> drbd_nl_family
  - Attribute IDs: T_* -> DRBD_A_*

Remove the nested_attr_tb static global buffer and move to a per-call
allocation approach: each deserialization manages its own nested
attribute table. This will be needed anyway when we eventually move
to parallel_ops, and it's actually simpler this way, so make the
move now.

Replace the functionality of the "sensitive" flag: this was only used
by a single field (shared_secret); open-code redaction logic for that
locally.

Also replace the "invariant" flag: this only had a couple of users,
and those basically never change. Hard code the check directly inline.

The genl_family struct itself is defined manually in drbd_nl.c.

Also replace a couple of drbd-specific wrappers (nla_put_u64_0pad,
drbd_nla_find_nested) with standard kernel functions while we're at
it.

Finally, completely remove the genl_magic system; DRBD was its only
user.

Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20260506124541.1951772-3-christoph.boehmwalder@linbit.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2026-05-08 19:23:23 -06:00

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/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
#ifndef _LINUX_DRBD_GEN_H
#define _LINUX_DRBD_GEN_H
#include <net/netlink.h>
#include <net/genetlink.h>
#include <uapi/linux/drbd_genl.h>
#include <linux/drbd.h>
#include <linux/drbd_limits.h>
/* Common nested types */
extern const struct nla_policy drbd_connection_info_nl_policy[DRBD_A_CONNECTION_INFO_CONN_ROLE + 1];
extern const struct nla_policy drbd_connection_statistics_nl_policy[DRBD_A_CONNECTION_STATISTICS_CONN_CONGESTED + 1];
extern const struct nla_policy drbd_detach_parms_nl_policy[DRBD_A_DETACH_PARMS_FORCE_DETACH + 1];
extern const struct nla_policy drbd_device_info_nl_policy[DRBD_A_DEVICE_INFO_DEV_DISK_STATE + 1];
extern const struct nla_policy drbd_device_statistics_nl_policy[DRBD_A_DEVICE_STATISTICS_HISTORY_UUIDS + 1];
extern const struct nla_policy drbd_disconnect_parms_nl_policy[DRBD_A_DISCONNECT_PARMS_FORCE_DISCONNECT + 1];
extern const struct nla_policy drbd_disk_conf_nl_policy[DRBD_A_DISK_CONF_DISABLE_WRITE_SAME + 1];
extern const struct nla_policy drbd_drbd_cfg_context_nl_policy[DRBD_A_DRBD_CFG_CONTEXT_CTX_PEER_ADDR + 1];
extern const struct nla_policy drbd_net_conf_nl_policy[DRBD_A_NET_CONF_SOCK_CHECK_TIMEO + 1];
extern const struct nla_policy drbd_new_c_uuid_parms_nl_policy[DRBD_A_NEW_C_UUID_PARMS_CLEAR_BM + 1];
extern const struct nla_policy drbd_peer_device_info_nl_policy[DRBD_A_PEER_DEVICE_INFO_PEER_RESYNC_SUSP_DEPENDENCY + 1];
extern const struct nla_policy drbd_peer_device_statistics_nl_policy[DRBD_A_PEER_DEVICE_STATISTICS_PEER_DEV_FLAGS + 1];
extern const struct nla_policy drbd_res_opts_nl_policy[DRBD_A_RES_OPTS_ON_NO_DATA + 1];
extern const struct nla_policy drbd_resize_parms_nl_policy[DRBD_A_RESIZE_PARMS_AL_STRIPE_SIZE + 1];
extern const struct nla_policy drbd_resource_info_nl_policy[DRBD_A_RESOURCE_INFO_RES_SUSP_FEN + 1];
extern const struct nla_policy drbd_resource_statistics_nl_policy[DRBD_A_RESOURCE_STATISTICS_RES_STAT_WRITE_ORDERING + 1];
extern const struct nla_policy drbd_set_role_parms_nl_policy[DRBD_A_SET_ROLE_PARMS_ASSUME_UPTODATE + 1];
extern const struct nla_policy drbd_start_ov_parms_nl_policy[DRBD_A_START_OV_PARMS_OV_STOP_SECTOR + 1];
/* Ops table for drbd */
extern const struct genl_split_ops drbd_nl_ops[32];
int drbd_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
struct genl_info *info);
void
drbd_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
struct genl_info *info);
int drbd_adm_dump_devices_done(struct netlink_callback *cb);
int drbd_adm_dump_connections_done(struct netlink_callback *cb);
int drbd_adm_dump_peer_devices_done(struct netlink_callback *cb);
int drbd_nl_get_status_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_get_status_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
int drbd_nl_new_minor_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_del_minor_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_new_resource_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_del_resource_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_resource_opts_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_connect_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_disconnect_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_attach_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_resize_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_primary_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_secondary_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_new_c_uuid_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_start_ov_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_detach_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_invalidate_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_inval_peer_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_pause_sync_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_resume_sync_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_suspend_io_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_resume_io_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_outdate_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_get_timeout_type_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_down_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_chg_disk_opts_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_chg_net_opts_doit(struct sk_buff *skb, struct genl_info *info);
int drbd_nl_get_resources_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int drbd_nl_get_devices_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int drbd_nl_get_connections_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int drbd_nl_get_peer_devices_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int drbd_nl_get_initial_state_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
enum {
DRBD_NLGRP_EVENTS,
};
struct drbd_cfg_reply {
char info_text[0];
__u32 info_text_len;
};
struct drbd_cfg_context {
__u32 ctx_volume;
char ctx_resource_name[128];
__u32 ctx_resource_name_len;
char ctx_my_addr[128];
__u32 ctx_my_addr_len;
char ctx_peer_addr[128];
__u32 ctx_peer_addr_len;
};
struct disk_conf {
char backing_dev[128];
__u32 backing_dev_len;
char meta_dev[128];
__u32 meta_dev_len;
__s32 meta_dev_idx;
__u64 disk_size;
__u32 max_bio_bvecs;
__u32 on_io_error;
__u32 fencing;
__u32 resync_rate;
__s32 resync_after;
__u32 al_extents;
__u32 c_plan_ahead;
__u32 c_delay_target;
__u32 c_fill_target;
__u32 c_max_rate;
__u32 c_min_rate;
unsigned char disk_barrier;
unsigned char disk_flushes;
unsigned char disk_drain;
unsigned char md_flushes;
__u32 disk_timeout;
__u32 read_balancing;
unsigned char al_updates;
unsigned char discard_zeroes_if_aligned;
__u32 rs_discard_granularity;
unsigned char disable_write_same;
};
struct res_opts {
char cpu_mask[DRBD_CPU_MASK_SIZE];
__u32 cpu_mask_len;
__u32 on_no_data;
};
struct net_conf {
char shared_secret[SHARED_SECRET_MAX];
__u32 shared_secret_len;
char cram_hmac_alg[SHARED_SECRET_MAX];
__u32 cram_hmac_alg_len;
char integrity_alg[SHARED_SECRET_MAX];
__u32 integrity_alg_len;
char verify_alg[SHARED_SECRET_MAX];
__u32 verify_alg_len;
char csums_alg[SHARED_SECRET_MAX];
__u32 csums_alg_len;
__u32 wire_protocol;
__u32 connect_int;
__u32 timeout;
__u32 ping_int;
__u32 ping_timeo;
__u32 sndbuf_size;
__u32 rcvbuf_size;
__u32 ko_count;
__u32 max_buffers;
__u32 max_epoch_size;
__u32 unplug_watermark;
__u32 after_sb_0p;
__u32 after_sb_1p;
__u32 after_sb_2p;
__u32 rr_conflict;
__u32 on_congestion;
__u32 cong_fill;
__u32 cong_extents;
unsigned char two_primaries;
unsigned char discard_my_data;
unsigned char tcp_cork;
unsigned char always_asbp;
unsigned char tentative;
unsigned char use_rle;
unsigned char csums_after_crash_only;
__u32 sock_check_timeo;
};
struct set_role_parms {
unsigned char assume_uptodate;
};
struct resize_parms {
__u64 resize_size;
unsigned char resize_force;
unsigned char no_resync;
__u32 al_stripes;
__u32 al_stripe_size;
};
struct state_info {
__u32 sib_reason;
__u32 current_state;
__u64 capacity;
__u64 ed_uuid;
__u32 prev_state;
__u32 new_state;
char uuids[DRBD_NL_UUIDS_SIZE];
__u32 uuids_len;
__u32 disk_flags;
__u64 bits_total;
__u64 bits_oos;
__u64 bits_rs_total;
__u64 bits_rs_failed;
char helper[32];
__u32 helper_len;
__u32 helper_exit_code;
__u64 send_cnt;
__u64 recv_cnt;
__u64 read_cnt;
__u64 writ_cnt;
__u64 al_writ_cnt;
__u64 bm_writ_cnt;
__u32 ap_bio_cnt;
__u32 ap_pending_cnt;
__u32 rs_pending_cnt;
};
struct start_ov_parms {
__u64 ov_start_sector;
__u64 ov_stop_sector;
};
struct new_c_uuid_parms {
unsigned char clear_bm;
};
struct timeout_parms {
__u32 timeout_type;
};
struct disconnect_parms {
unsigned char force_disconnect;
};
struct detach_parms {
unsigned char force_detach;
};
struct resource_info {
__u32 res_role;
unsigned char res_susp;
unsigned char res_susp_nod;
unsigned char res_susp_fen;
};
struct device_info {
__u32 dev_disk_state;
};
struct connection_info {
__u32 conn_connection_state;
__u32 conn_role;
};
struct peer_device_info {
__u32 peer_repl_state;
__u32 peer_disk_state;
__u32 peer_resync_susp_user;
__u32 peer_resync_susp_peer;
__u32 peer_resync_susp_dependency;
};
struct resource_statistics {
__u32 res_stat_write_ordering;
};
struct device_statistics {
__u64 dev_size;
__u64 dev_read;
__u64 dev_write;
__u64 dev_al_writes;
__u64 dev_bm_writes;
__u32 dev_upper_pending;
__u32 dev_lower_pending;
unsigned char dev_upper_blocked;
unsigned char dev_lower_blocked;
unsigned char dev_al_suspended;
__u64 dev_exposed_data_uuid;
__u64 dev_current_uuid;
__u32 dev_disk_flags;
char history_uuids[DRBD_NL_HISTORY_UUIDS_SIZE];
__u32 history_uuids_len;
};
struct connection_statistics {
unsigned char conn_congested;
};
struct peer_device_statistics {
__u64 peer_dev_received;
__u64 peer_dev_sent;
__u32 peer_dev_pending;
__u32 peer_dev_unacked;
__u64 peer_dev_out_of_sync;
__u64 peer_dev_resync_failed;
__u64 peer_dev_bitmap_uuid;
__u32 peer_dev_flags;
};
struct drbd_notification_header {
__u32 nh_type;
};
struct drbd_helper_info {
char helper_name[32];
__u32 helper_name_len;
__u32 helper_status;
};
int drbd_cfg_reply_to_skb(struct sk_buff *skb, struct drbd_cfg_reply *s);
int drbd_cfg_context_from_attrs(struct drbd_cfg_context *s, struct genl_info *info);
int drbd_cfg_context_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int drbd_cfg_context_to_skb(struct sk_buff *skb, struct drbd_cfg_context *s);
int disk_conf_from_attrs(struct disk_conf *s, struct genl_info *info);
int disk_conf_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int disk_conf_to_skb(struct sk_buff *skb, struct disk_conf *s);
void set_disk_conf_defaults(struct disk_conf *x);
int res_opts_from_attrs(struct res_opts *s, struct genl_info *info);
int res_opts_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int res_opts_to_skb(struct sk_buff *skb, struct res_opts *s);
void set_res_opts_defaults(struct res_opts *x);
int net_conf_from_attrs(struct net_conf *s, struct genl_info *info);
int net_conf_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int net_conf_to_skb(struct sk_buff *skb, struct net_conf *s);
void set_net_conf_defaults(struct net_conf *x);
int set_role_parms_from_attrs(struct set_role_parms *s, struct genl_info *info);
int set_role_parms_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int set_role_parms_to_skb(struct sk_buff *skb, struct set_role_parms *s);
int resize_parms_from_attrs(struct resize_parms *s, struct genl_info *info);
int resize_parms_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int resize_parms_to_skb(struct sk_buff *skb, struct resize_parms *s);
void set_resize_parms_defaults(struct resize_parms *x);
int state_info_to_skb(struct sk_buff *skb, struct state_info *s);
int start_ov_parms_from_attrs(struct start_ov_parms *s, struct genl_info *info);
int start_ov_parms_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int start_ov_parms_to_skb(struct sk_buff *skb, struct start_ov_parms *s);
int new_c_uuid_parms_from_attrs(struct new_c_uuid_parms *s, struct genl_info *info);
int new_c_uuid_parms_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int new_c_uuid_parms_to_skb(struct sk_buff *skb, struct new_c_uuid_parms *s);
int timeout_parms_to_skb(struct sk_buff *skb, struct timeout_parms *s);
int disconnect_parms_from_attrs(struct disconnect_parms *s, struct genl_info *info);
int disconnect_parms_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int disconnect_parms_to_skb(struct sk_buff *skb, struct disconnect_parms *s);
int detach_parms_from_attrs(struct detach_parms *s, struct genl_info *info);
int detach_parms_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int detach_parms_to_skb(struct sk_buff *skb, struct detach_parms *s);
int resource_info_from_attrs(struct resource_info *s, struct genl_info *info);
int resource_info_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int resource_info_to_skb(struct sk_buff *skb, struct resource_info *s);
int device_info_from_attrs(struct device_info *s, struct genl_info *info);
int device_info_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int device_info_to_skb(struct sk_buff *skb, struct device_info *s);
int connection_info_from_attrs(struct connection_info *s, struct genl_info *info);
int connection_info_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int connection_info_to_skb(struct sk_buff *skb, struct connection_info *s);
int peer_device_info_from_attrs(struct peer_device_info *s, struct genl_info *info);
int peer_device_info_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int peer_device_info_to_skb(struct sk_buff *skb, struct peer_device_info *s);
int resource_statistics_from_attrs(struct resource_statistics *s, struct genl_info *info);
int resource_statistics_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int resource_statistics_to_skb(struct sk_buff *skb, struct resource_statistics *s);
int device_statistics_from_attrs(struct device_statistics *s, struct genl_info *info);
int device_statistics_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int device_statistics_to_skb(struct sk_buff *skb, struct device_statistics *s);
int connection_statistics_from_attrs(struct connection_statistics *s, struct genl_info *info);
int connection_statistics_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int connection_statistics_to_skb(struct sk_buff *skb, struct connection_statistics *s);
int peer_device_statistics_from_attrs(struct peer_device_statistics *s, struct genl_info *info);
int peer_device_statistics_ntb_from_attrs(struct nlattr ***ret_nested_attribute_table, struct genl_info *info);
int peer_device_statistics_to_skb(struct sk_buff *skb, struct peer_device_statistics *s);
int drbd_notification_header_to_skb(struct sk_buff *skb, struct drbd_notification_header *s);
int drbd_helper_info_to_skb(struct sk_buff *skb, struct drbd_helper_info *s);
#endif /* _LINUX_DRBD_GEN_H */
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