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_small_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 .small_ops = dlm_nl_ops, 77 .n_small_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 *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} 138 139