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
16 static uint32_t dlm_nl_seqnum;
17 static uint32_t listener_nlportid;
18
19 static struct genl_family family;
20
prepare_data(u8 cmd,struct sk_buff ** skbp,size_t size)21 static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size)
22 {
23 struct sk_buff *skb;
24 void *data;
25
26 skb = genlmsg_new(size, GFP_NOFS);
27 if (!skb)
28 return -ENOMEM;
29
30 /* add the message headers */
31 data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd);
32 if (!data) {
33 nlmsg_free(skb);
34 return -EINVAL;
35 }
36
37 *skbp = skb;
38 return 0;
39 }
40
mk_data(struct sk_buff * skb)41 static struct dlm_lock_data *mk_data(struct sk_buff *skb)
42 {
43 struct nlattr *ret;
44
45 ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data));
46 if (!ret)
47 return NULL;
48 return nla_data(ret);
49 }
50
send_data(struct sk_buff * skb)51 static int send_data(struct sk_buff *skb)
52 {
53 struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
54 void *data = genlmsg_data(genlhdr);
55
56 genlmsg_end(skb, data);
57
58 return genlmsg_unicast(&init_net, skb, listener_nlportid);
59 }
60
user_cmd(struct sk_buff * skb,struct genl_info * info)61 static int user_cmd(struct sk_buff *skb, struct genl_info *info)
62 {
63 listener_nlportid = info->snd_portid;
64 printk("user_cmd nlpid %u\n", listener_nlportid);
65 return 0;
66 }
67
68 static const struct genl_ops dlm_nl_ops[] = {
69 {
70 .cmd = DLM_CMD_HELLO,
71 .doit = user_cmd,
72 },
73 };
74
75 static struct genl_family family __ro_after_init = {
76 .name = DLM_GENL_NAME,
77 .version = DLM_GENL_VERSION,
78 .ops = dlm_nl_ops,
79 .n_ops = ARRAY_SIZE(dlm_nl_ops),
80 .module = THIS_MODULE,
81 };
82
dlm_netlink_init(void)83 int __init dlm_netlink_init(void)
84 {
85 return genl_register_family(&family);
86 }
87
dlm_netlink_exit(void)88 void dlm_netlink_exit(void)
89 {
90 genl_unregister_family(&family);
91 }
92
fill_data(struct dlm_lock_data * data,struct dlm_lkb * lkb)93 static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
94 {
95 struct dlm_rsb *r = lkb->lkb_resource;
96
97 memset(data, 0, sizeof(struct dlm_lock_data));
98
99 data->version = DLM_LOCK_DATA_VERSION;
100 data->nodeid = lkb->lkb_nodeid;
101 data->ownpid = lkb->lkb_ownpid;
102 data->id = lkb->lkb_id;
103 data->remid = lkb->lkb_remid;
104 data->status = lkb->lkb_status;
105 data->grmode = lkb->lkb_grmode;
106 data->rqmode = lkb->lkb_rqmode;
107 if (lkb->lkb_ua)
108 data->xid = lkb->lkb_ua->xid;
109 if (r) {
110 data->lockspace_id = r->res_ls->ls_global_id;
111 data->resource_namelen = r->res_length;
112 memcpy(data->resource_name, r->res_name, r->res_length);
113 }
114 }
115
dlm_timeout_warn(struct dlm_lkb * lkb)116 void dlm_timeout_warn(struct dlm_lkb *lkb)
117 {
118 struct sk_buff *send_skb;
119 struct dlm_lock_data *data;
120 size_t size;
121 int rv;
122
123 size = nla_total_size(sizeof(struct dlm_lock_data)) +
124 nla_total_size(0); /* why this? */
125
126 rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size);
127 if (rv < 0)
128 return;
129
130 data = mk_data(send_skb);
131 if (!data) {
132 nlmsg_free(send_skb);
133 return;
134 }
135
136 fill_data(data, lkb);
137
138 send_data(send_skb);
139 }
140
141