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1/*
2 * Copyright (c) 2010 Voltaire Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__
34
35#include <net/netlink.h>
36#include <net/net_namespace.h>
37#include <net/sock.h>
38#include <rdma/rdma_netlink.h>
39
40struct ibnl_client {
41 struct list_head list;
42 int index;
43 int nops;
44 const struct ibnl_client_cbs *cb_table;
45};
46
47static DEFINE_MUTEX(ibnl_mutex);
48static struct sock *nls;
49static LIST_HEAD(client_list);
50
51int ibnl_add_client(int index, int nops,
52 const struct ibnl_client_cbs cb_table[])
53{
54 struct ibnl_client *cur;
55 struct ibnl_client *nl_client;
56
57 nl_client = kmalloc(sizeof *nl_client, GFP_KERNEL);
58 if (!nl_client)
59 return -ENOMEM;
60
61 nl_client->index = index;
62 nl_client->nops = nops;
63 nl_client->cb_table = cb_table;
64
65 mutex_lock(&ibnl_mutex);
66
67 list_for_each_entry(cur, &client_list, list) {
68 if (cur->index == index) {
69 pr_warn("Client for %d already exists\n", index);
70 mutex_unlock(&ibnl_mutex);
71 kfree(nl_client);
72 return -EINVAL;
73 }
74 }
75
76 list_add_tail(&nl_client->list, &client_list);
77
78 mutex_unlock(&ibnl_mutex);
79
80 return 0;
81}
82EXPORT_SYMBOL(ibnl_add_client);
83
84int ibnl_remove_client(int index)
85{
86 struct ibnl_client *cur, *next;
87
88 mutex_lock(&ibnl_mutex);
89 list_for_each_entry_safe(cur, next, &client_list, list) {
90 if (cur->index == index) {
91 list_del(&(cur->list));
92 mutex_unlock(&ibnl_mutex);
93 kfree(cur);
94 return 0;
95 }
96 }
97 pr_warn("Can't remove callback for client idx %d. Not found\n", index);
98 mutex_unlock(&ibnl_mutex);
99
100 return -EINVAL;
101}
102EXPORT_SYMBOL(ibnl_remove_client);
103
104void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
105 int len, int client, int op)
106{
107 unsigned char *prev_tail;
108
109 prev_tail = skb_tail_pointer(skb);
110 *nlh = NLMSG_NEW(skb, 0, seq, RDMA_NL_GET_TYPE(client, op),
111 len, NLM_F_MULTI);
112 (*nlh)->nlmsg_len = skb_tail_pointer(skb) - prev_tail;
113 return NLMSG_DATA(*nlh);
114
115nlmsg_failure:
116 nlmsg_trim(skb, prev_tail);
117 return NULL;
118}
119EXPORT_SYMBOL(ibnl_put_msg);
120
121int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
122 int len, void *data, int type)
123{
124 unsigned char *prev_tail;
125
126 prev_tail = skb_tail_pointer(skb);
127 NLA_PUT(skb, type, len, data);
128 nlh->nlmsg_len += skb_tail_pointer(skb) - prev_tail;
129 return 0;
130
131nla_put_failure:
132 nlmsg_trim(skb, prev_tail - nlh->nlmsg_len);
133 return -EMSGSIZE;
134}
135EXPORT_SYMBOL(ibnl_put_attr);
136
137static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
138{
139 struct ibnl_client *client;
140 int type = nlh->nlmsg_type;
141 int index = RDMA_NL_GET_CLIENT(type);
142 int op = RDMA_NL_GET_OP(type);
143
144 list_for_each_entry(client, &client_list, list) {
145 if (client->index == index) {
146 if (op < 0 || op >= client->nops ||
147 !client->cb_table[RDMA_NL_GET_OP(op)].dump)
148 return -EINVAL;
149 return netlink_dump_start(nls, skb, nlh,
150 client->cb_table[op].dump,
151 NULL, 0);
152 }
153 }
154
155 pr_info("Index %d wasn't found in client list\n", index);
156 return -EINVAL;
157}
158
159static void ibnl_rcv(struct sk_buff *skb)
160{
161 mutex_lock(&ibnl_mutex);
162 netlink_rcv_skb(skb, &ibnl_rcv_msg);
163 mutex_unlock(&ibnl_mutex);
164}
165
166int __init ibnl_init(void)
167{
168 nls = netlink_kernel_create(&init_net, NETLINK_RDMA, 0, ibnl_rcv,
169 NULL, THIS_MODULE);
170 if (!nls) {
171 pr_warn("Failed to create netlink socket\n");
172 return -ENOMEM;
173 }
174
175 return 0;
176}
177
178void ibnl_cleanup(void)
179{
180 struct ibnl_client *cur, *next;
181
182 mutex_lock(&ibnl_mutex);
183 list_for_each_entry_safe(cur, next, &client_list, list) {
184 list_del(&(cur->list));
185 kfree(cur);
186 }
187 mutex_unlock(&ibnl_mutex);
188
189 netlink_kernel_release(nls);
190}
1/*
2 * Copyright (c) 2010 Voltaire Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__
34
35#include <linux/export.h>
36#include <net/netlink.h>
37#include <net/net_namespace.h>
38#include <net/sock.h>
39#include <rdma/rdma_netlink.h>
40
41struct ibnl_client {
42 struct list_head list;
43 int index;
44 int nops;
45 const struct ibnl_client_cbs *cb_table;
46};
47
48static DEFINE_MUTEX(ibnl_mutex);
49static struct sock *nls;
50static LIST_HEAD(client_list);
51
52int ibnl_add_client(int index, int nops,
53 const struct ibnl_client_cbs cb_table[])
54{
55 struct ibnl_client *cur;
56 struct ibnl_client *nl_client;
57
58 nl_client = kmalloc(sizeof *nl_client, GFP_KERNEL);
59 if (!nl_client)
60 return -ENOMEM;
61
62 nl_client->index = index;
63 nl_client->nops = nops;
64 nl_client->cb_table = cb_table;
65
66 mutex_lock(&ibnl_mutex);
67
68 list_for_each_entry(cur, &client_list, list) {
69 if (cur->index == index) {
70 pr_warn("Client for %d already exists\n", index);
71 mutex_unlock(&ibnl_mutex);
72 kfree(nl_client);
73 return -EINVAL;
74 }
75 }
76
77 list_add_tail(&nl_client->list, &client_list);
78
79 mutex_unlock(&ibnl_mutex);
80
81 return 0;
82}
83EXPORT_SYMBOL(ibnl_add_client);
84
85int ibnl_remove_client(int index)
86{
87 struct ibnl_client *cur, *next;
88
89 mutex_lock(&ibnl_mutex);
90 list_for_each_entry_safe(cur, next, &client_list, list) {
91 if (cur->index == index) {
92 list_del(&(cur->list));
93 mutex_unlock(&ibnl_mutex);
94 kfree(cur);
95 return 0;
96 }
97 }
98 pr_warn("Can't remove callback for client idx %d. Not found\n", index);
99 mutex_unlock(&ibnl_mutex);
100
101 return -EINVAL;
102}
103EXPORT_SYMBOL(ibnl_remove_client);
104
105void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
106 int len, int client, int op)
107{
108 unsigned char *prev_tail;
109
110 prev_tail = skb_tail_pointer(skb);
111 *nlh = nlmsg_put(skb, 0, seq, RDMA_NL_GET_TYPE(client, op),
112 len, NLM_F_MULTI);
113 if (!*nlh)
114 goto out_nlmsg_trim;
115 (*nlh)->nlmsg_len = skb_tail_pointer(skb) - prev_tail;
116 return nlmsg_data(*nlh);
117
118out_nlmsg_trim:
119 nlmsg_trim(skb, prev_tail);
120 return NULL;
121}
122EXPORT_SYMBOL(ibnl_put_msg);
123
124int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
125 int len, void *data, int type)
126{
127 unsigned char *prev_tail;
128
129 prev_tail = skb_tail_pointer(skb);
130 if (nla_put(skb, type, len, data))
131 goto nla_put_failure;
132 nlh->nlmsg_len += skb_tail_pointer(skb) - prev_tail;
133 return 0;
134
135nla_put_failure:
136 nlmsg_trim(skb, prev_tail - nlh->nlmsg_len);
137 return -EMSGSIZE;
138}
139EXPORT_SYMBOL(ibnl_put_attr);
140
141static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
142{
143 struct ibnl_client *client;
144 int type = nlh->nlmsg_type;
145 int index = RDMA_NL_GET_CLIENT(type);
146 int op = RDMA_NL_GET_OP(type);
147
148 list_for_each_entry(client, &client_list, list) {
149 if (client->index == index) {
150 if (op < 0 || op >= client->nops ||
151 !client->cb_table[op].dump)
152 return -EINVAL;
153
154 {
155 struct netlink_dump_control c = {
156 .dump = client->cb_table[op].dump,
157 .module = client->cb_table[op].module,
158 };
159 return netlink_dump_start(nls, skb, nlh, &c);
160 }
161 }
162 }
163
164 pr_info("Index %d wasn't found in client list\n", index);
165 return -EINVAL;
166}
167
168static void ibnl_rcv(struct sk_buff *skb)
169{
170 mutex_lock(&ibnl_mutex);
171 netlink_rcv_skb(skb, &ibnl_rcv_msg);
172 mutex_unlock(&ibnl_mutex);
173}
174
175int __init ibnl_init(void)
176{
177 struct netlink_kernel_cfg cfg = {
178 .input = ibnl_rcv,
179 };
180
181 nls = netlink_kernel_create(&init_net, NETLINK_RDMA, &cfg);
182 if (!nls) {
183 pr_warn("Failed to create netlink socket\n");
184 return -ENOMEM;
185 }
186
187 return 0;
188}
189
190void ibnl_cleanup(void)
191{
192 struct ibnl_client *cur, *next;
193
194 mutex_lock(&ibnl_mutex);
195 list_for_each_entry_safe(cur, next, &client_list, list) {
196 list_del(&(cur->list));
197 kfree(cur);
198 }
199 mutex_unlock(&ibnl_mutex);
200
201 netlink_kernel_release(nls);
202}