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1/*
2 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
3 *
4 * This copyrighted material is made available to anyone wishing to use,
5 * modify, copy, or redistribute it subject to the terms and conditions
6 * of the GNU General Public License v.2.
7 */
8
9#include <net/genetlink.h>
10#include <linux/dlm.h>
11#include <linux/dlm_netlink.h>
12#include <linux/gfp.h>
13
14#include "dlm_internal.h"
15
16static uint32_t dlm_nl_seqnum;
17static uint32_t listener_nlpid;
18
19static struct genl_family family = {
20 .id = GENL_ID_GENERATE,
21 .name = DLM_GENL_NAME,
22 .version = DLM_GENL_VERSION,
23};
24
25static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size)
26{
27 struct sk_buff *skb;
28 void *data;
29
30 skb = genlmsg_new(size, GFP_NOFS);
31 if (!skb)
32 return -ENOMEM;
33
34 /* add the message headers */
35 data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd);
36 if (!data) {
37 nlmsg_free(skb);
38 return -EINVAL;
39 }
40
41 *skbp = skb;
42 return 0;
43}
44
45static struct dlm_lock_data *mk_data(struct sk_buff *skb)
46{
47 struct nlattr *ret;
48
49 ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data));
50 if (!ret)
51 return NULL;
52 return nla_data(ret);
53}
54
55static int send_data(struct sk_buff *skb)
56{
57 struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
58 void *data = genlmsg_data(genlhdr);
59 int rv;
60
61 rv = genlmsg_end(skb, data);
62 if (rv < 0) {
63 nlmsg_free(skb);
64 return rv;
65 }
66
67 return genlmsg_unicast(&init_net, skb, listener_nlpid);
68}
69
70static int user_cmd(struct sk_buff *skb, struct genl_info *info)
71{
72 listener_nlpid = info->snd_pid;
73 printk("user_cmd nlpid %u\n", listener_nlpid);
74 return 0;
75}
76
77static struct genl_ops dlm_nl_ops = {
78 .cmd = DLM_CMD_HELLO,
79 .doit = user_cmd,
80};
81
82int __init dlm_netlink_init(void)
83{
84 return genl_register_family_with_ops(&family, &dlm_nl_ops, 1);
85}
86
87void dlm_netlink_exit(void)
88{
89 genl_unregister_family(&family);
90}
91
92static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
93{
94 struct dlm_rsb *r = lkb->lkb_resource;
95
96 memset(data, 0, sizeof(struct dlm_lock_data));
97
98 data->version = DLM_LOCK_DATA_VERSION;
99 data->nodeid = lkb->lkb_nodeid;
100 data->ownpid = lkb->lkb_ownpid;
101 data->id = lkb->lkb_id;
102 data->remid = lkb->lkb_remid;
103 data->status = lkb->lkb_status;
104 data->grmode = lkb->lkb_grmode;
105 data->rqmode = lkb->lkb_rqmode;
106 if (lkb->lkb_ua)
107 data->xid = lkb->lkb_ua->xid;
108 if (r) {
109 data->lockspace_id = r->res_ls->ls_global_id;
110 data->resource_namelen = r->res_length;
111 memcpy(data->resource_name, r->res_name, r->res_length);
112 }
113}
114
115void dlm_timeout_warn(struct dlm_lkb *lkb)
116{
117 struct sk_buff *uninitialized_var(send_skb);
118 struct dlm_lock_data *data;
119 size_t size;
120 int rv;
121
122 size = nla_total_size(sizeof(struct dlm_lock_data)) +
123 nla_total_size(0); /* why this? */
124
125 rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size);
126 if (rv < 0)
127 return;
128
129 data = mk_data(send_skb);
130 if (!data) {
131 nlmsg_free(send_skb);
132 return;
133 }
134
135 fill_data(data, lkb);
136
137 send_data(send_skb);
138}
139
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
4 */
5
6#include <net/genetlink.h>
7#include <linux/dlm.h>
8#include <linux/dlm_netlink.h>
9#include <linux/gfp.h>
10
11#include "dlm_internal.h"
12
13static uint32_t dlm_nl_seqnum;
14static uint32_t listener_nlportid;
15
16static struct genl_family family;
17
18static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size)
19{
20 struct sk_buff *skb;
21 void *data;
22
23 skb = genlmsg_new(size, GFP_NOFS);
24 if (!skb)
25 return -ENOMEM;
26
27 /* add the message headers */
28 data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd);
29 if (!data) {
30 nlmsg_free(skb);
31 return -EINVAL;
32 }
33
34 *skbp = skb;
35 return 0;
36}
37
38static struct dlm_lock_data *mk_data(struct sk_buff *skb)
39{
40 struct nlattr *ret;
41
42 ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data));
43 if (!ret)
44 return NULL;
45 return nla_data(ret);
46}
47
48static int send_data(struct sk_buff *skb)
49{
50 struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
51 void *data = genlmsg_data(genlhdr);
52
53 genlmsg_end(skb, data);
54
55 return genlmsg_unicast(&init_net, skb, listener_nlportid);
56}
57
58static int user_cmd(struct sk_buff *skb, struct genl_info *info)
59{
60 listener_nlportid = info->snd_portid;
61 printk("user_cmd nlpid %u\n", listener_nlportid);
62 return 0;
63}
64
65static const struct genl_ops dlm_nl_ops[] = {
66 {
67 .cmd = DLM_CMD_HELLO,
68 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
69 .doit = user_cmd,
70 },
71};
72
73static struct genl_family family __ro_after_init = {
74 .name = DLM_GENL_NAME,
75 .version = DLM_GENL_VERSION,
76 .ops = dlm_nl_ops,
77 .n_ops = ARRAY_SIZE(dlm_nl_ops),
78 .module = THIS_MODULE,
79};
80
81int __init dlm_netlink_init(void)
82{
83 return genl_register_family(&family);
84}
85
86void dlm_netlink_exit(void)
87{
88 genl_unregister_family(&family);
89}
90
91static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
92{
93 struct dlm_rsb *r = lkb->lkb_resource;
94
95 memset(data, 0, sizeof(struct dlm_lock_data));
96
97 data->version = DLM_LOCK_DATA_VERSION;
98 data->nodeid = lkb->lkb_nodeid;
99 data->ownpid = lkb->lkb_ownpid;
100 data->id = lkb->lkb_id;
101 data->remid = lkb->lkb_remid;
102 data->status = lkb->lkb_status;
103 data->grmode = lkb->lkb_grmode;
104 data->rqmode = lkb->lkb_rqmode;
105 if (lkb->lkb_ua)
106 data->xid = lkb->lkb_ua->xid;
107 if (r) {
108 data->lockspace_id = r->res_ls->ls_global_id;
109 data->resource_namelen = r->res_length;
110 memcpy(data->resource_name, r->res_name, r->res_length);
111 }
112}
113
114void dlm_timeout_warn(struct dlm_lkb *lkb)
115{
116 struct sk_buff *uninitialized_var(send_skb);
117 struct dlm_lock_data *data;
118 size_t size;
119 int rv;
120
121 size = nla_total_size(sizeof(struct dlm_lock_data)) +
122 nla_total_size(0); /* why this? */
123
124 rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size);
125 if (rv < 0)
126 return;
127
128 data = mk_data(send_skb);
129 if (!data) {
130 nlmsg_free(send_skb);
131 return;
132 }
133
134 fill_data(data, lkb);
135
136 send_data(send_skb);
137}
138