3 * full generic netlink message:
4 * |nlmsghdr|genlmsghdr|<payload>
7 * |optional fixed size family header|<sequence of netlink attributes>
9 * sequence of netlink attributes:
10 * I chose to have all "top level" attributes NLA_NESTED,
11 * corresponding to some real struct.
12 * So we have a sequence of |tla, len|<nested nla sequence>
14 * nested nla sequence:
15 * may be empty, or contain a sequence of netlink attributes
16 * representing the struct fields.
18 * The tag number of any field (regardless of containing struct)
19 * will be available as T_ ## field_name,
20 * so you cannot have the same field name in two differnt structs.
22 * The tag numbers themselves are per struct, though,
23 * so should always begin at 1 (not 0, that is the special "NLA_UNSPEC" type,
24 * which we won't use here).
25 * The tag numbers are used as index in the respective nla_policy array.
27 * GENL_struct(tag_name, tag_number, struct name, struct fields) - struct and policy
29 * generates the struct declaration,
30 * generates an entry in the tla enum,
32 * generates an entry in the static tla policy
33 * with .type = NLA_NESTED
34 * generates the static <struct_name>_nl_policy definition,
35 * and static conversion functions
39 * GENL_mc_group(group)
43 * defines and registers the mcast group,
44 * and provides a send helper
46 * GENL_notification(op_name, op_num, mcast_group, tla list)
47 * These are notifications to userspace.
50 * generates an entry in the genl_ops enum,
54 * mcast group: the name of the mcast group this notification should be
56 * tla list: the list of expected top level attributes,
57 * for documentation and sanity checking.
59 * GENL_op(op_name, op_num, flags and handler, tla list) - "genl operations"
60 * These are requests from userspace.
62 * _op and _notification share the same "number space",
63 * op_nr will be assigned to "genlmsghdr->cmd"
66 * generates an entry in the genl_ops enum,
68 * generates an entry in the static genl_ops array,
69 * and static register/unregister functions to
70 * genl_register_family_with_ops().
73 * GENL_op_init( .doit = x, .dumpit = y, .flags = something)
74 * GENL_doit(x) => .dumpit = NULL, .flags = GENL_ADMIN_PERM
75 * tla list: the list of expected top level attributes,
76 * for documentation and sanity checking.
83 /* this is sent kernel -> userland on various error conditions, and contains
84 * informational textual info, which is supposedly human readable.
85 * The computer relevant return code is in the drbd_genlmsghdr.
87 GENL_struct(DRBD_NLA_CFG_REPLY, 1, drbd_cfg_reply,
88 /* "arbitrary" size strings, nla_policy.len = 0 */
89 __str_field(1, DRBD_GENLA_F_MANDATORY, info_text, 0)
92 /* Configuration requests typically need a context to operate on.
93 * Possible keys are device minor (fits in the drbd_genlmsghdr),
94 * the replication link (aka connection) name,
95 * and/or the replication group (aka resource) name,
96 * and the volume id within the resource. */
97 GENL_struct(DRBD_NLA_CFG_CONTEXT, 2, drbd_cfg_context,
98 __u32_field(1, DRBD_GENLA_F_MANDATORY, ctx_volume)
99 __str_field(2, DRBD_GENLA_F_MANDATORY, ctx_resource_name, 128)
100 __bin_field(3, DRBD_GENLA_F_MANDATORY, ctx_my_addr, 128)
101 __bin_field(4, DRBD_GENLA_F_MANDATORY, ctx_peer_addr, 128)
104 GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
105 __str_field(1, DRBD_F_REQUIRED | DRBD_F_INVARIANT, backing_dev, 128)
106 __str_field(2, DRBD_F_REQUIRED | DRBD_F_INVARIANT, meta_dev, 128)
107 __s32_field(3, DRBD_F_REQUIRED | DRBD_F_INVARIANT, meta_dev_idx)
109 /* use the resize command to try and change the disk_size */
110 __u64_field(4, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, disk_size)
111 /* we could change the max_bio_bvecs,
112 * but it won't propagate through the stack */
113 __u32_field(5, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, max_bio_bvecs)
115 __u32_field_def(6, DRBD_GENLA_F_MANDATORY, on_io_error, DRBD_ON_IO_ERROR_DEF)
116 __u32_field_def(7, DRBD_GENLA_F_MANDATORY, fencing, DRBD_FENCING_DEF)
118 __u32_field_def(8, DRBD_GENLA_F_MANDATORY, resync_rate, DRBD_RESYNC_RATE_DEF)
119 __s32_field_def(9, DRBD_GENLA_F_MANDATORY, resync_after, DRBD_MINOR_NUMBER_DEF)
120 __u32_field_def(10, DRBD_GENLA_F_MANDATORY, al_extents, DRBD_AL_EXTENTS_DEF)
121 __u32_field_def(11, DRBD_GENLA_F_MANDATORY, c_plan_ahead, DRBD_C_PLAN_AHEAD_DEF)
122 __u32_field_def(12, DRBD_GENLA_F_MANDATORY, c_delay_target, DRBD_C_DELAY_TARGET_DEF)
123 __u32_field_def(13, DRBD_GENLA_F_MANDATORY, c_fill_target, DRBD_C_FILL_TARGET_DEF)
124 __u32_field_def(14, DRBD_GENLA_F_MANDATORY, c_max_rate, DRBD_C_MAX_RATE_DEF)
125 __u32_field_def(15, DRBD_GENLA_F_MANDATORY, c_min_rate, DRBD_C_MIN_RATE_DEF)
127 __flg_field_def(16, DRBD_GENLA_F_MANDATORY, disk_barrier, DRBD_DISK_BARRIER_DEF)
128 __flg_field_def(17, DRBD_GENLA_F_MANDATORY, disk_flushes, DRBD_DISK_FLUSHES_DEF)
129 __flg_field_def(18, DRBD_GENLA_F_MANDATORY, disk_drain, DRBD_DISK_DRAIN_DEF)
130 __flg_field_def(19, DRBD_GENLA_F_MANDATORY, md_flushes, DRBD_MD_FLUSHES_DEF)
131 __u32_field_def(20, DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF)
134 GENL_struct(DRBD_NLA_RESOURCE_OPTS, 4, res_opts,
135 __str_field_def(1, DRBD_GENLA_F_MANDATORY, cpu_mask, 32)
136 __u32_field_def(2, DRBD_GENLA_F_MANDATORY, on_no_data, DRBD_ON_NO_DATA_DEF)
139 GENL_struct(DRBD_NLA_NET_CONF, 5, net_conf,
140 __str_field_def(1, DRBD_GENLA_F_MANDATORY | DRBD_F_SENSITIVE,
141 shared_secret, SHARED_SECRET_MAX)
142 __str_field_def(2, DRBD_GENLA_F_MANDATORY, cram_hmac_alg, SHARED_SECRET_MAX)
143 __str_field_def(3, DRBD_GENLA_F_MANDATORY, integrity_alg, SHARED_SECRET_MAX)
144 __str_field_def(4, DRBD_GENLA_F_MANDATORY, verify_alg, SHARED_SECRET_MAX)
145 __str_field_def(5, DRBD_GENLA_F_MANDATORY, csums_alg, SHARED_SECRET_MAX)
146 __u32_field_def(6, DRBD_GENLA_F_MANDATORY, wire_protocol, DRBD_PROTOCOL_DEF)
147 __u32_field_def(7, DRBD_GENLA_F_MANDATORY, connect_int, DRBD_CONNECT_INT_DEF)
148 __u32_field_def(8, DRBD_GENLA_F_MANDATORY, timeout, DRBD_TIMEOUT_DEF)
149 __u32_field_def(9, DRBD_GENLA_F_MANDATORY, ping_int, DRBD_PING_INT_DEF)
150 __u32_field_def(10, DRBD_GENLA_F_MANDATORY, ping_timeo, DRBD_PING_TIMEO_DEF)
151 __u32_field_def(11, DRBD_GENLA_F_MANDATORY, sndbuf_size, DRBD_SNDBUF_SIZE_DEF)
152 __u32_field_def(12, DRBD_GENLA_F_MANDATORY, rcvbuf_size, DRBD_RCVBUF_SIZE_DEF)
153 __u32_field_def(13, DRBD_GENLA_F_MANDATORY, ko_count, DRBD_KO_COUNT_DEF)
154 __u32_field_def(14, DRBD_GENLA_F_MANDATORY, max_buffers, DRBD_MAX_BUFFERS_DEF)
155 __u32_field_def(15, DRBD_GENLA_F_MANDATORY, max_epoch_size, DRBD_MAX_EPOCH_SIZE_DEF)
156 __u32_field_def(16, DRBD_GENLA_F_MANDATORY, unplug_watermark, DRBD_UNPLUG_WATERMARK_DEF)
157 __u32_field_def(17, DRBD_GENLA_F_MANDATORY, after_sb_0p, DRBD_AFTER_SB_0P_DEF)
158 __u32_field_def(18, DRBD_GENLA_F_MANDATORY, after_sb_1p, DRBD_AFTER_SB_1P_DEF)
159 __u32_field_def(19, DRBD_GENLA_F_MANDATORY, after_sb_2p, DRBD_AFTER_SB_2P_DEF)
160 __u32_field_def(20, DRBD_GENLA_F_MANDATORY, rr_conflict, DRBD_RR_CONFLICT_DEF)
161 __u32_field_def(21, DRBD_GENLA_F_MANDATORY, on_congestion, DRBD_ON_CONGESTION_DEF)
162 __u32_field_def(22, DRBD_GENLA_F_MANDATORY, cong_fill, DRBD_CONG_FILL_DEF)
163 __u32_field_def(23, DRBD_GENLA_F_MANDATORY, cong_extents, DRBD_CONG_EXTENTS_DEF)
164 __flg_field_def(24, DRBD_GENLA_F_MANDATORY, two_primaries, DRBD_ALLOW_TWO_PRIMARIES_DEF)
165 __flg_field(25, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, discard_my_data)
166 __flg_field_def(26, DRBD_GENLA_F_MANDATORY, tcp_cork, DRBD_TCP_CORK_DEF)
167 __flg_field_def(27, DRBD_GENLA_F_MANDATORY, always_asbp, DRBD_ALWAYS_ASBP_DEF)
168 __flg_field(28, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, tentative)
169 __flg_field_def(29, DRBD_GENLA_F_MANDATORY, use_rle, DRBD_USE_RLE_DEF)
172 GENL_struct(DRBD_NLA_SET_ROLE_PARMS, 6, set_role_parms,
173 __flg_field(1, DRBD_GENLA_F_MANDATORY, assume_uptodate)
176 GENL_struct(DRBD_NLA_RESIZE_PARMS, 7, resize_parms,
177 __u64_field(1, DRBD_GENLA_F_MANDATORY, resize_size)
178 __flg_field(2, DRBD_GENLA_F_MANDATORY, resize_force)
179 __flg_field(3, DRBD_GENLA_F_MANDATORY, no_resync)
182 GENL_struct(DRBD_NLA_STATE_INFO, 8, state_info,
183 /* the reason of the broadcast,
184 * if this is an event triggered broadcast. */
185 __u32_field(1, DRBD_GENLA_F_MANDATORY, sib_reason)
186 __u32_field(2, DRBD_F_REQUIRED, current_state)
187 __u64_field(3, DRBD_GENLA_F_MANDATORY, capacity)
188 __u64_field(4, DRBD_GENLA_F_MANDATORY, ed_uuid)
190 /* These are for broadcast from after state change work.
191 * prev_state and new_state are from the moment the state change took
192 * place, new_state is not neccessarily the same as current_state,
193 * there may have been more state changes since. Which will be
194 * broadcasted soon, in their respective after state change work. */
195 __u32_field(5, DRBD_GENLA_F_MANDATORY, prev_state)
196 __u32_field(6, DRBD_GENLA_F_MANDATORY, new_state)
198 /* if we have a local disk: */
199 __bin_field(7, DRBD_GENLA_F_MANDATORY, uuids, (UI_SIZE*sizeof(__u64)))
200 __u32_field(8, DRBD_GENLA_F_MANDATORY, disk_flags)
201 __u64_field(9, DRBD_GENLA_F_MANDATORY, bits_total)
202 __u64_field(10, DRBD_GENLA_F_MANDATORY, bits_oos)
203 /* and in case resync or online verify is active */
204 __u64_field(11, DRBD_GENLA_F_MANDATORY, bits_rs_total)
205 __u64_field(12, DRBD_GENLA_F_MANDATORY, bits_rs_failed)
207 /* for pre and post notifications of helper execution */
208 __str_field(13, DRBD_GENLA_F_MANDATORY, helper, 32)
209 __u32_field(14, DRBD_GENLA_F_MANDATORY, helper_exit_code)
212 GENL_struct(DRBD_NLA_START_OV_PARMS, 9, start_ov_parms,
213 __u64_field(1, DRBD_GENLA_F_MANDATORY, ov_start_sector)
216 GENL_struct(DRBD_NLA_NEW_C_UUID_PARMS, 10, new_c_uuid_parms,
217 __flg_field(1, DRBD_GENLA_F_MANDATORY, clear_bm)
220 GENL_struct(DRBD_NLA_TIMEOUT_PARMS, 11, timeout_parms,
221 __u32_field(1, DRBD_F_REQUIRED, timeout_type)
224 GENL_struct(DRBD_NLA_DISCONNECT_PARMS, 12, disconnect_parms,
225 __flg_field(1, DRBD_GENLA_F_MANDATORY, force_disconnect)
228 GENL_struct(DRBD_NLA_DETACH_PARMS, 13, detach_parms,
229 __flg_field(1, DRBD_GENLA_F_MANDATORY, force_detach)
233 * Notifications and commands (genlmsghdr->cmd)
235 GENL_mc_group(events)
237 /* kernel -> userspace announcement of changes */
239 DRBD_EVENT, 1, events,
240 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
241 GENL_tla_expected(DRBD_NLA_STATE_INFO, DRBD_F_REQUIRED)
242 GENL_tla_expected(DRBD_NLA_NET_CONF, DRBD_GENLA_F_MANDATORY)
243 GENL_tla_expected(DRBD_NLA_DISK_CONF, DRBD_GENLA_F_MANDATORY)
244 GENL_tla_expected(DRBD_NLA_SYNCER_CONF, DRBD_GENLA_F_MANDATORY)
247 /* query kernel for specific or all info */
249 DRBD_ADM_GET_STATUS, 2,
251 .doit = drbd_adm_get_status,
252 .dumpit = drbd_adm_get_status_all,
253 /* anyone may ask for the status,
254 * it is broadcasted anyways */
256 /* To select the object .doit.
257 * Or a subset of objects in .dumpit. */
258 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY)
261 /* add DRBD minor devices as volumes to resources */
262 GENL_op(DRBD_ADM_NEW_MINOR, 5, GENL_doit(drbd_adm_add_minor),
263 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
264 GENL_op(DRBD_ADM_DEL_MINOR, 6, GENL_doit(drbd_adm_delete_minor),
265 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
267 /* add or delete resources */
268 GENL_op(DRBD_ADM_NEW_RESOURCE, 7, GENL_doit(drbd_adm_new_resource),
269 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
270 GENL_op(DRBD_ADM_DEL_RESOURCE, 8, GENL_doit(drbd_adm_del_resource),
271 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
273 GENL_op(DRBD_ADM_RESOURCE_OPTS, 9,
274 GENL_doit(drbd_adm_resource_opts),
275 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
276 GENL_tla_expected(DRBD_NLA_RESOURCE_OPTS, DRBD_GENLA_F_MANDATORY)
280 DRBD_ADM_CONNECT, 10,
281 GENL_doit(drbd_adm_connect),
282 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
283 GENL_tla_expected(DRBD_NLA_NET_CONF, DRBD_F_REQUIRED)
287 DRBD_ADM_CHG_NET_OPTS, 29,
288 GENL_doit(drbd_adm_net_opts),
289 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
290 GENL_tla_expected(DRBD_NLA_NET_CONF, DRBD_F_REQUIRED)
293 GENL_op(DRBD_ADM_DISCONNECT, 11, GENL_doit(drbd_adm_disconnect),
294 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
296 GENL_op(DRBD_ADM_ATTACH, 12,
297 GENL_doit(drbd_adm_attach),
298 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
299 GENL_tla_expected(DRBD_NLA_DISK_CONF, DRBD_F_REQUIRED)
302 GENL_op(DRBD_ADM_CHG_DISK_OPTS, 28,
303 GENL_doit(drbd_adm_disk_opts),
304 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
305 GENL_tla_expected(DRBD_NLA_DISK_OPTS, DRBD_F_REQUIRED)
310 GENL_doit(drbd_adm_resize),
311 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
312 GENL_tla_expected(DRBD_NLA_RESIZE_PARMS, DRBD_GENLA_F_MANDATORY)
316 DRBD_ADM_PRIMARY, 14,
317 GENL_doit(drbd_adm_set_role),
318 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
319 GENL_tla_expected(DRBD_NLA_SET_ROLE_PARMS, DRBD_F_REQUIRED)
323 DRBD_ADM_SECONDARY, 15,
324 GENL_doit(drbd_adm_set_role),
325 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
326 GENL_tla_expected(DRBD_NLA_SET_ROLE_PARMS, DRBD_F_REQUIRED)
330 DRBD_ADM_NEW_C_UUID, 16,
331 GENL_doit(drbd_adm_new_c_uuid),
332 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
333 GENL_tla_expected(DRBD_NLA_NEW_C_UUID_PARMS, DRBD_GENLA_F_MANDATORY)
337 DRBD_ADM_START_OV, 17,
338 GENL_doit(drbd_adm_start_ov),
339 GENL_tla_expected(DRBD_NLA_START_OV_PARMS, DRBD_GENLA_F_MANDATORY)
342 GENL_op(DRBD_ADM_DETACH, 18, GENL_doit(drbd_adm_detach),
343 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
344 GENL_tla_expected(DRBD_NLA_DETACH_PARMS, DRBD_GENLA_F_MANDATORY))
346 GENL_op(DRBD_ADM_INVALIDATE, 19, GENL_doit(drbd_adm_invalidate),
347 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
348 GENL_op(DRBD_ADM_INVAL_PEER, 20, GENL_doit(drbd_adm_invalidate_peer),
349 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
350 GENL_op(DRBD_ADM_PAUSE_SYNC, 21, GENL_doit(drbd_adm_pause_sync),
351 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
352 GENL_op(DRBD_ADM_RESUME_SYNC, 22, GENL_doit(drbd_adm_resume_sync),
353 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
354 GENL_op(DRBD_ADM_SUSPEND_IO, 23, GENL_doit(drbd_adm_suspend_io),
355 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
356 GENL_op(DRBD_ADM_RESUME_IO, 24, GENL_doit(drbd_adm_resume_io),
357 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
358 GENL_op(DRBD_ADM_OUTDATE, 25, GENL_doit(drbd_adm_outdate),
359 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
360 GENL_op(DRBD_ADM_GET_TIMEOUT_TYPE, 26, GENL_doit(drbd_adm_get_timeout_type),
361 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
362 GENL_op(DRBD_ADM_DOWN, 27, GENL_doit(drbd_adm_down),
363 GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))