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2522fe45 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3ae1acf9 DT |
2 | /* |
3 | * Copyright (C) 2007 Red Hat, Inc. All rights reserved. | |
3ae1acf9 DT |
4 | */ |
5 | ||
6 | #include <net/genetlink.h> | |
7 | #include <linux/dlm.h> | |
8 | #include <linux/dlm_netlink.h> | |
5a0e3ad6 | 9 | #include <linux/gfp.h> |
3ae1acf9 DT |
10 | |
11 | #include "dlm_internal.h" | |
12 | ||
13 | static uint32_t dlm_nl_seqnum; | |
15e47304 | 14 | static uint32_t listener_nlportid; |
3ae1acf9 | 15 | |
489111e5 | 16 | static struct genl_family family; |
3ae1acf9 DT |
17 | |
18 | static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size) | |
19 | { | |
20 | struct sk_buff *skb; | |
21 | void *data; | |
22 | ||
573c24c4 | 23 | skb = genlmsg_new(size, GFP_NOFS); |
3ae1acf9 DT |
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 | ||
38 | static 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 | ||
48 | static int send_data(struct sk_buff *skb) | |
49 | { | |
50 | struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); | |
51 | void *data = genlmsg_data(genlhdr); | |
3ae1acf9 | 52 | |
053c095a | 53 | genlmsg_end(skb, data); |
3ae1acf9 | 54 | |
15e47304 | 55 | return genlmsg_unicast(&init_net, skb, listener_nlportid); |
3ae1acf9 DT |
56 | } |
57 | ||
58 | static int user_cmd(struct sk_buff *skb, struct genl_info *info) | |
59 | { | |
15e47304 EB |
60 | listener_nlportid = info->snd_portid; |
61 | printk("user_cmd nlpid %u\n", listener_nlportid); | |
3ae1acf9 DT |
62 | return 0; |
63 | } | |
64 | ||
66a9b928 | 65 | static const struct genl_small_ops dlm_nl_ops[] = { |
c53ed742 JB |
66 | { |
67 | .cmd = DLM_CMD_HELLO, | |
ef6243ac | 68 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
c53ed742 JB |
69 | .doit = user_cmd, |
70 | }, | |
3ae1acf9 DT |
71 | }; |
72 | ||
56989f6d | 73 | static struct genl_family family __ro_after_init = { |
489111e5 JB |
74 | .name = DLM_GENL_NAME, |
75 | .version = DLM_GENL_VERSION, | |
66a9b928 JK |
76 | .small_ops = dlm_nl_ops, |
77 | .n_small_ops = ARRAY_SIZE(dlm_nl_ops), | |
489111e5 JB |
78 | .module = THIS_MODULE, |
79 | }; | |
80 | ||
30727174 | 81 | int __init dlm_netlink_init(void) |
3ae1acf9 | 82 | { |
489111e5 | 83 | return genl_register_family(&family); |
3ae1acf9 DT |
84 | } |
85 | ||
88ad2319 | 86 | void dlm_netlink_exit(void) |
3ae1acf9 | 87 | { |
3ae1acf9 DT |
88 | genl_unregister_family(&family); |
89 | } | |
90 | ||
91 | static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) | |
92 | { | |
93 | struct dlm_rsb *r = lkb->lkb_resource; | |
3ae1acf9 DT |
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; | |
d292c0cc DT |
105 | if (lkb->lkb_ua) |
106 | data->xid = lkb->lkb_ua->xid; | |
3ae1acf9 DT |
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 | ||
114 | void dlm_timeout_warn(struct dlm_lkb *lkb) | |
115 | { | |
3f649ab7 | 116 | struct sk_buff *send_skb; |
3ae1acf9 | 117 | struct dlm_lock_data *data; |
3ae1acf9 DT |
118 | size_t size; |
119 | int rv; | |
120 | ||
3ae1acf9 DT |
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 |