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path: root/drivers/w1/w1_netlink.c
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Diffstat (limited to 'drivers/w1/w1_netlink.c')
-rw-r--r--drivers/w1/w1_netlink.c219
1 files changed, 186 insertions, 33 deletions
diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index 328645da7972..65c5ebd0787e 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -21,72 +21,225 @@
21 21
22#include <linux/skbuff.h> 22#include <linux/skbuff.h>
23#include <linux/netlink.h> 23#include <linux/netlink.h>
24#include <linux/connector.h>
24 25
25#include "w1.h" 26#include "w1.h"
26#include "w1_log.h" 27#include "w1_log.h"
27#include "w1_netlink.h" 28#include "w1_netlink.h"
28 29
29#ifndef NETLINK_DISABLED 30#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
30void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) 31void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
31{ 32{
32 unsigned int size; 33 char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
33 struct sk_buff *skb; 34 struct cn_msg *m = (struct cn_msg *)buf;
34 struct w1_netlink_msg *data; 35 struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);
35 struct nlmsghdr *nlh;
36 36
37 if (!dev->nls) 37 memset(buf, 0, sizeof(buf));
38 return;
39 38
40 size = NLMSG_SPACE(sizeof(struct w1_netlink_msg)); 39 m->id.idx = CN_W1_IDX;
40 m->id.val = CN_W1_VAL;
41 41
42 skb = alloc_skb(size, GFP_ATOMIC); 42 m->seq = dev->seq++;
43 if (!skb) { 43 m->len = sizeof(struct w1_netlink_msg);
44 dev_err(&dev->dev, "skb_alloc() failed.\n"); 44
45 return; 45 memcpy(w, msg, sizeof(struct w1_netlink_msg));
46 } 46
47 cn_netlink_send(m, 0, GFP_KERNEL);
48}
49
50static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg,
51 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
52{
53 dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n",
54 __func__, dev->name, cmd->cmd, cmd->len);
55
56 if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH)
57 return -EINVAL;
58
59 w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
60 return 0;
61}
62
63static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
64 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
65{
66 void *data;
67 struct w1_netlink_msg *h;
68 struct w1_netlink_cmd *c;
69 struct cn_msg *cm;
70 int err;
71
72 data = kzalloc(sizeof(struct cn_msg) +
73 sizeof(struct w1_netlink_msg) +
74 sizeof(struct w1_netlink_cmd) +
75 cmd->len, GFP_KERNEL);
76 if (!data)
77 return -ENOMEM;
78
79 cm = (struct cn_msg *)(data);
80 h = (struct w1_netlink_msg *)(cm + 1);
81 c = (struct w1_netlink_cmd *)(h + 1);
82
83 memcpy(cm, msg, sizeof(struct cn_msg));
84 memcpy(h, hdr, sizeof(struct w1_netlink_msg));
85 memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
47 86
48 nlh = NLMSG_PUT(skb, 0, dev->seq++, NLMSG_DONE, size - sizeof(*nlh)); 87 cm->ack = msg->seq+1;
88 cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
49 89
50 data = (struct w1_netlink_msg *)NLMSG_DATA(nlh); 90 h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
51 91
52 memcpy(data, msg, sizeof(struct w1_netlink_msg)); 92 memcpy(c->data, cmd->data, c->len);
53 93
54 NETLINK_CB(skb).dst_group = dev->groups; 94 err = cn_netlink_send(cm, 0, GFP_KERNEL);
55 netlink_broadcast(dev->nls, skb, 0, dev->groups, GFP_ATOMIC);
56 95
57nlmsg_failure: 96 kfree(data);
58 return; 97
98 return err;
59} 99}
60 100
61int dev_init_netlink(struct w1_master *dev) 101static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
102 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
62{ 103{
63 dev->nls = netlink_kernel_create(NETLINK_W1, 1, NULL, THIS_MODULE); 104 int err = 0;
64 if (!dev->nls) { 105
65 printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n", 106 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
66 NETLINK_W1, dev->dev.bus_id); 107 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc,
108 cmd->cmd, cmd->len);
109
110 switch (cmd->cmd) {
111 case W1_CMD_READ:
112 w1_read_block(sl->master, cmd->data, cmd->len);
113 w1_send_read_reply(sl, msg, hdr, cmd);
114 break;
115 case W1_CMD_WRITE:
116 w1_write_block(sl->master, cmd->data, cmd->len);
117 break;
118 case W1_CMD_SEARCH:
119 case W1_CMD_ALARM_SEARCH:
120 w1_search_process(sl->master,
121 (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
122 break;
123 default:
124 err = -1;
125 break;
67 } 126 }
68 127
69 return 0; 128 return err;
70} 129}
71 130
72void dev_fini_netlink(struct w1_master *dev) 131static void w1_cn_callback(void *data)
73{ 132{
74 if (dev->nls && dev->nls->sk_socket) 133 struct cn_msg *msg = data;
75 sock_release(dev->nls->sk_socket); 134 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
135 struct w1_netlink_cmd *cmd;
136 struct w1_slave *sl;
137 struct w1_master *dev;
138 int err = 0;
139
140 while (msg->len && !err) {
141 struct w1_reg_num id;
142 u16 mlen = m->len;
143 u8 *cmd_data = m->data;
144
145 dev = NULL;
146 sl = NULL;
147
148 memcpy(&id, m->id.id, sizeof(id));
149#if 0
150 printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
151 __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
152#endif
153 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
154 err = -E2BIG;
155 break;
156 }
157
158 if (!mlen)
159 goto out_cont;
160
161 if (m->type == W1_MASTER_CMD) {
162 dev = w1_search_master_id(m->id.mst.id);
163 } else if (m->type == W1_SLAVE_CMD) {
164 sl = w1_search_slave(&id);
165 if (sl)
166 dev = sl->master;
167 }
168
169 if (!dev) {
170 err = -ENODEV;
171 goto out_cont;
172 }
173
174 mutex_lock(&dev->mutex);
175
176 if (sl && w1_reset_select_slave(sl)) {
177 err = -ENODEV;
178 goto out_up;
179 }
180
181 while (mlen) {
182 cmd = (struct w1_netlink_cmd *)cmd_data;
183
184 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
185 err = -E2BIG;
186 break;
187 }
188
189 if (sl)
190 w1_process_command_slave(sl, msg, m, cmd);
191 else
192 w1_process_command_master(dev, msg, m, cmd);
193
194 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
195 mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
196 }
197out_up:
198 atomic_dec(&dev->refcnt);
199 if (sl)
200 atomic_dec(&sl->refcnt);
201 mutex_unlock(&dev->mutex);
202out_cont:
203 msg->len -= sizeof(struct w1_netlink_msg) + m->len;
204 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
205
206 /*
207 * Let's allow requests for nonexisting devices.
208 */
209 if (err == -ENODEV)
210 err = 0;
211 }
212#if 0
213 if (err) {
214 printk("%s: malformed message. Dropping.\n", __func__);
215 }
216#endif
76} 217}
77#else
78#warning Netlink support is disabled. Please compile with NET support enabled.
79 218
219int w1_init_netlink(void)
220{
221 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
222
223 return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
224}
225
226void w1_fini_netlink(void)
227{
228 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
229
230 cn_del_callback(&w1_id);
231}
232#else
80void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) 233void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
81{ 234{
82} 235}
83 236
84int dev_init_netlink(struct w1_master *dev) 237int w1_init_netlink(void)
85{ 238{
86 return 0; 239 return 0;
87} 240}
88 241
89void dev_fini_netlink(struct w1_master *dev) 242void w1_fini_netlink(void)
90{ 243{
91} 244}
92#endif 245#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-08 10:53:07 -0500