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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_chk_listeners(unsigned int group)
53{
54 if (netlink_has_listeners(nls, group) == 0)
55 return -1;
56 return 0;
57}
58EXPORT_SYMBOL(ibnl_chk_listeners);
59
60int ibnl_add_client(int index, int nops,
61 const struct ibnl_client_cbs cb_table[])
62{
63 struct ibnl_client *cur;
64 struct ibnl_client *nl_client;
65
66 nl_client = kmalloc(sizeof *nl_client, GFP_KERNEL);
67 if (!nl_client)
68 return -ENOMEM;
69
70 nl_client->index = index;
71 nl_client->nops = nops;
72 nl_client->cb_table = cb_table;
73
74 mutex_lock(&ibnl_mutex);
75
76 list_for_each_entry(cur, &client_list, list) {
77 if (cur->index == index) {
78 pr_warn("Client for %d already exists\n", index);
79 mutex_unlock(&ibnl_mutex);
80 kfree(nl_client);
81 return -EINVAL;
82 }
83 }
84
85 list_add_tail(&nl_client->list, &client_list);
86
87 mutex_unlock(&ibnl_mutex);
88
89 return 0;
90}
91EXPORT_SYMBOL(ibnl_add_client);
92
93int ibnl_remove_client(int index)
94{
95 struct ibnl_client *cur, *next;
96
97 mutex_lock(&ibnl_mutex);
98 list_for_each_entry_safe(cur, next, &client_list, list) {
99 if (cur->index == index) {
100 list_del(&(cur->list));
101 mutex_unlock(&ibnl_mutex);
102 kfree(cur);
103 return 0;
104 }
105 }
106 pr_warn("Can't remove callback for client idx %d. Not found\n", index);
107 mutex_unlock(&ibnl_mutex);
108
109 return -EINVAL;
110}
111EXPORT_SYMBOL(ibnl_remove_client);
112
113void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
114 int len, int client, int op, int flags)
115{
116 unsigned char *prev_tail;
117
118 prev_tail = skb_tail_pointer(skb);
119 *nlh = nlmsg_put(skb, 0, seq, RDMA_NL_GET_TYPE(client, op),
120 len, flags);
121 if (!*nlh)
122 goto out_nlmsg_trim;
123 (*nlh)->nlmsg_len = skb_tail_pointer(skb) - prev_tail;
124 return nlmsg_data(*nlh);
125
126out_nlmsg_trim:
127 nlmsg_trim(skb, prev_tail);
128 return NULL;
129}
130EXPORT_SYMBOL(ibnl_put_msg);
131
132int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
133 int len, void *data, int type)
134{
135 unsigned char *prev_tail;
136
137 prev_tail = skb_tail_pointer(skb);
138 if (nla_put(skb, type, len, data))
139 goto nla_put_failure;
140 nlh->nlmsg_len += skb_tail_pointer(skb) - prev_tail;
141 return 0;
142
143nla_put_failure:
144 nlmsg_trim(skb, prev_tail - nlh->nlmsg_len);
145 return -EMSGSIZE;
146}
147EXPORT_SYMBOL(ibnl_put_attr);
148
149static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
150{
151 struct ibnl_client *client;
152 int type = nlh->nlmsg_type;
153 int index = RDMA_NL_GET_CLIENT(type);
154 int op = RDMA_NL_GET_OP(type);
155
156 list_for_each_entry(client, &client_list, list) {
157 if (client->index == index) {
158 if (op < 0 || op >= client->nops ||
159 !client->cb_table[op].dump)
160 return -EINVAL;
161
162 /*
163 * For response or local service set_timeout request,
164 * there is no need to use netlink_dump_start.
165 */
166 if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
167 (index == RDMA_NL_LS &&
168 op == RDMA_NL_LS_OP_SET_TIMEOUT)) {
169 struct netlink_callback cb = {
170 .skb = skb,
171 .nlh = nlh,
172 .dump = client->cb_table[op].dump,
173 .module = client->cb_table[op].module,
174 };
175
176 return cb.dump(skb, &cb);
177 }
178
179 {
180 struct netlink_dump_control c = {
181 .dump = client->cb_table[op].dump,
182 .module = client->cb_table[op].module,
183 };
184 return netlink_dump_start(nls, skb, nlh, &c);
185 }
186 }
187 }
188
189 pr_info("Index %d wasn't found in client list\n", index);
190 return -EINVAL;
191}
192
193static void ibnl_rcv_reply_skb(struct sk_buff *skb)
194{
195 struct nlmsghdr *nlh;
196 int msglen;
197
198 /*
199 * Process responses until there is no more message or the first
200 * request. Generally speaking, it is not recommended to mix responses
201 * with requests.
202 */
203 while (skb->len >= nlmsg_total_size(0)) {
204 nlh = nlmsg_hdr(skb);
205
206 if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
207 return;
208
209 /* Handle response only */
210 if (nlh->nlmsg_flags & NLM_F_REQUEST)
211 return;
212
213 ibnl_rcv_msg(skb, nlh);
214
215 msglen = NLMSG_ALIGN(nlh->nlmsg_len);
216 if (msglen > skb->len)
217 msglen = skb->len;
218 skb_pull(skb, msglen);
219 }
220}
221
222static void ibnl_rcv(struct sk_buff *skb)
223{
224 mutex_lock(&ibnl_mutex);
225 ibnl_rcv_reply_skb(skb);
226 netlink_rcv_skb(skb, &ibnl_rcv_msg);
227 mutex_unlock(&ibnl_mutex);
228}
229
230int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
231 __u32 pid)
232{
233 return nlmsg_unicast(nls, skb, pid);
234}
235EXPORT_SYMBOL(ibnl_unicast);
236
237int ibnl_multicast(struct sk_buff *skb, struct nlmsghdr *nlh,
238 unsigned int group, gfp_t flags)
239{
240 return nlmsg_multicast(nls, skb, 0, group, flags);
241}
242EXPORT_SYMBOL(ibnl_multicast);
243
244int __init ibnl_init(void)
245{
246 struct netlink_kernel_cfg cfg = {
247 .input = ibnl_rcv,
248 };
249
250 nls = netlink_kernel_create(&init_net, NETLINK_RDMA, &cfg);
251 if (!nls) {
252 pr_warn("Failed to create netlink socket\n");
253 return -ENOMEM;
254 }
255
256 return 0;
257}
258
259void ibnl_cleanup(void)
260{
261 struct ibnl_client *cur, *next;
262
263 mutex_lock(&ibnl_mutex);
264 list_for_each_entry_safe(cur, next, &client_list, list) {
265 list_del(&(cur->list));
266 kfree(cur);
267 }
268 mutex_unlock(&ibnl_mutex);
269
270 netlink_kernel_release(nls);
271}