* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
+#include <linux/connector.h>
#include "w1.h"
#include "w1_log.h"
#include "w1_netlink.h"
-#ifndef NETLINK_DISABLED
+#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
{
- unsigned int size;
- struct sk_buff *skb;
- struct w1_netlink_msg *data;
- struct nlmsghdr *nlh;
+ char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
+ struct cn_msg *m = (struct cn_msg *)buf;
+ struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);
- if (!dev->nls)
- return;
+ memset(buf, 0, sizeof(buf));
+
+ m->id.idx = CN_W1_IDX;
+ m->id.val = CN_W1_VAL;
+
+ m->seq = dev->seq++;
+ m->len = sizeof(struct w1_netlink_msg);
+
+ memcpy(w, msg, sizeof(struct w1_netlink_msg));
+
+ cn_netlink_send(m, 0, GFP_KERNEL);
+}
- size = NLMSG_SPACE(sizeof(struct w1_netlink_msg));
+static void w1_send_slave(struct w1_master *dev, u64 rn)
+{
+ struct cn_msg *msg = dev->priv;
+ struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
+ struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
+ int avail;
+
+ avail = dev->priv_size - cmd->len;
+
+ if (avail > 8) {
+ u64 *data = (void *)(cmd + 1) + cmd->len;
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb) {
- dev_err(&dev->dev, "skb_alloc() failed.\n");
+ *data = rn;
+ cmd->len += 8;
+ hdr->len += 8;
+ msg->len += 8;
return;
}
- nlh = NLMSG_PUT(skb, 0, dev->seq++, NLMSG_DONE, size - sizeof(*nlh));
+ msg->ack++;
+ cn_netlink_send(msg, 0, GFP_KERNEL);
+
+ msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
+ hdr->len = sizeof(struct w1_netlink_cmd);
+ cmd->len = 0;
+}
+
+static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
+ unsigned int avail)
+{
+ struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
+ struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
+ int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
+
+ dev->priv = msg;
+ dev->priv_size = avail;
+
+ w1_search_devices(dev, search_type, w1_send_slave);
+
+ msg->ack = 0;
+ cn_netlink_send(msg, 0, GFP_KERNEL);
+
+ dev->priv = NULL;
+ dev->priv_size = 0;
+
+ return 0;
+}
+
+static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
+ struct w1_netlink_cmd *cmd)
+{
+ void *data;
+ struct w1_netlink_msg *h;
+ struct w1_netlink_cmd *c;
+ struct cn_msg *cm;
+ int err;
+
+ data = kzalloc(sizeof(struct cn_msg) +
+ sizeof(struct w1_netlink_msg) +
+ sizeof(struct w1_netlink_cmd) +
+ cmd->len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ cm = (struct cn_msg *)(data);
+ h = (struct w1_netlink_msg *)(cm + 1);
+ c = (struct w1_netlink_cmd *)(h + 1);
+
+ memcpy(cm, msg, sizeof(struct cn_msg));
+ memcpy(h, hdr, sizeof(struct w1_netlink_msg));
+ memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
+
+ cm->ack = msg->seq+1;
+ cm->len = sizeof(struct w1_netlink_msg) +
+ sizeof(struct w1_netlink_cmd) + cmd->len;
+
+ h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
+
+ memcpy(c->data, cmd->data, c->len);
+
+ err = cn_netlink_send(cm, 0, GFP_KERNEL);
+
+ kfree(data);
+
+ return err;
+}
+
+static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
+ struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+{
+ int err = 0;
+
+ switch (cmd->cmd) {
+ case W1_CMD_TOUCH:
+ w1_touch_block(dev, cmd->data, cmd->len);
+ w1_send_read_reply(msg, hdr, cmd);
+ break;
+ case W1_CMD_READ:
+ w1_read_block(dev, cmd->data, cmd->len);
+ w1_send_read_reply(msg, hdr, cmd);
+ break;
+ case W1_CMD_WRITE:
+ w1_write_block(dev, cmd->data, cmd->len);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
+ struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
+{
+ int err = -EINVAL;
+ struct cn_msg *msg;
+ struct w1_netlink_msg *hdr;
+ struct w1_netlink_cmd *cmd;
+
+ msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
- data = (struct w1_netlink_msg *)NLMSG_DATA(nlh);
+ msg->id = req_msg->id;
+ msg->seq = req_msg->seq;
+ msg->ack = 0;
+ msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
+
+ hdr = (struct w1_netlink_msg *)(msg + 1);
+ cmd = (struct w1_netlink_cmd *)(hdr + 1);
+
+ hdr->type = W1_MASTER_CMD;
+ hdr->id = req_hdr->id;
+ hdr->len = sizeof(struct w1_netlink_cmd);
+
+ cmd->cmd = req_cmd->cmd;
+ cmd->len = 0;
+
+ switch (cmd->cmd) {
+ case W1_CMD_SEARCH:
+ case W1_CMD_ALARM_SEARCH:
+ err = w1_process_search_command(dev, msg,
+ PAGE_SIZE - msg->len - sizeof(struct cn_msg));
+ break;
+ case W1_CMD_READ:
+ case W1_CMD_WRITE:
+ case W1_CMD_TOUCH:
+ err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
+ break;
+ case W1_CMD_RESET:
+ err = w1_reset_bus(dev);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
- memcpy(data, msg, sizeof(struct w1_netlink_msg));
+ kfree(msg);
+ return err;
+}
- NETLINK_CB(skb).dst_group = dev->groups;
- netlink_broadcast(dev->nls, skb, 0, dev->groups, GFP_ATOMIC);
+static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
+ struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+{
+ dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
+ __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
+ sl->reg_num.crc, cmd->cmd, cmd->len);
-nlmsg_failure:
- return;
+ return w1_process_command_io(sl->master, msg, hdr, cmd);
}
-int dev_init_netlink(struct w1_master *dev)
+static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
{
- dev->nls = netlink_kernel_create(NETLINK_W1, 1, NULL, THIS_MODULE);
- if (!dev->nls) {
- printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n",
- NETLINK_W1, dev->dev.bus_id);
+ struct w1_master *m;
+ struct cn_msg *cn;
+ struct w1_netlink_msg *w;
+ u32 *id;
+
+ if (mcmd->type != W1_LIST_MASTERS) {
+ printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
+ __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
+ return -EPROTO;
+ }
+
+ cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!cn)
+ return -ENOMEM;
+
+ cn->id.idx = CN_W1_IDX;
+ cn->id.val = CN_W1_VAL;
+
+ cn->seq = msg->seq;
+ cn->ack = 1;
+ cn->len = sizeof(struct w1_netlink_msg);
+ w = (struct w1_netlink_msg *)(cn + 1);
+
+ w->type = W1_LIST_MASTERS;
+ w->status = 0;
+ w->len = 0;
+ id = (u32 *)(w + 1);
+
+ mutex_lock(&w1_mlock);
+ list_for_each_entry(m, &w1_masters, w1_master_entry) {
+ if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
+ cn_netlink_send(cn, 0, GFP_KERNEL);
+ cn->ack++;
+ cn->len = sizeof(struct w1_netlink_msg);
+ w->len = 0;
+ id = (u32 *)(w + 1);
+ }
+
+ *id = m->id;
+ w->len += sizeof(*id);
+ cn->len += sizeof(*id);
+ id++;
}
+ cn->ack = 0;
+ cn_netlink_send(cn, 0, GFP_KERNEL);
+ mutex_unlock(&w1_mlock);
+ kfree(cn);
return 0;
}
-void dev_fini_netlink(struct w1_master *dev)
+static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
+ struct w1_netlink_cmd *rcmd, int error)
{
- if (dev->nls && dev->nls->sk_socket)
- sock_release(dev->nls->sk_socket);
+ struct cn_msg *cmsg;
+ struct w1_netlink_msg *msg;
+ struct w1_netlink_cmd *cmd;
+
+ cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL);
+ if (!cmsg)
+ return -ENOMEM;
+
+ msg = (struct w1_netlink_msg *)(cmsg + 1);
+ cmd = (struct w1_netlink_cmd *)(msg + 1);
+
+ memcpy(cmsg, rcmsg, sizeof(*cmsg));
+ cmsg->len = sizeof(*msg);
+
+ memcpy(msg, rmsg, sizeof(*msg));
+ msg->len = 0;
+ msg->status = (short)-error;
+
+ if (rcmd) {
+ memcpy(cmd, rcmd, sizeof(*cmd));
+ cmd->len = 0;
+ msg->len += sizeof(*cmd);
+ cmsg->len += sizeof(*cmd);
+ }
+
+ error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
+ kfree(cmsg);
+
+ return error;
}
-#else
-#warning Netlink support is disabled. Please compile with NET support enabled.
+static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+{
+ struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
+ struct w1_netlink_cmd *cmd;
+ struct w1_slave *sl;
+ struct w1_master *dev;
+ int err = 0;
+
+ while (msg->len && !err) {
+ struct w1_reg_num id;
+ u16 mlen = m->len;
+ u8 *cmd_data = m->data;
+
+ dev = NULL;
+ sl = NULL;
+ cmd = NULL;
+
+ memcpy(&id, m->id.id, sizeof(id));
+#if 0
+ printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
+ __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
+#endif
+ if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
+ err = -E2BIG;
+ break;
+ }
+
+ if (m->type == W1_MASTER_CMD) {
+ dev = w1_search_master_id(m->id.mst.id);
+ } else if (m->type == W1_SLAVE_CMD) {
+ sl = w1_search_slave(&id);
+ if (sl)
+ dev = sl->master;
+ } else {
+ err = w1_process_command_root(msg, m);
+ goto out_cont;
+ }
+
+ if (!dev) {
+ err = -ENODEV;
+ goto out_cont;
+ }
+
+ err = 0;
+ if (!mlen)
+ goto out_cont;
+
+ mutex_lock(&dev->mutex);
+
+ if (sl && w1_reset_select_slave(sl)) {
+ err = -ENODEV;
+ goto out_up;
+ }
+
+ while (mlen) {
+ cmd = (struct w1_netlink_cmd *)cmd_data;
+
+ if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
+ err = -E2BIG;
+ break;
+ }
+
+ if (sl)
+ err = w1_process_command_slave(sl, msg, m, cmd);
+ else
+ err = w1_process_command_master(dev, msg, m, cmd);
+
+ w1_netlink_send_error(msg, m, cmd, err);
+ err = 0;
+
+ cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
+ mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
+ }
+out_up:
+ atomic_dec(&dev->refcnt);
+ if (sl)
+ atomic_dec(&sl->refcnt);
+ mutex_unlock(&dev->mutex);
+out_cont:
+ if (!cmd || err)
+ w1_netlink_send_error(msg, m, cmd, err);
+ msg->len -= sizeof(struct w1_netlink_msg) + m->len;
+ m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
+
+ /*
+ * Let's allow requests for nonexisting devices.
+ */
+ if (err == -ENODEV)
+ err = 0;
+ }
+}
+
+int w1_init_netlink(void)
+{
+ struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
+
+ return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
+}
+
+void w1_fini_netlink(void)
+{
+ struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
+
+ cn_del_callback(&w1_id);
+}
+#else
void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
{
}
-int dev_init_netlink(struct w1_master *dev)
+int w1_init_netlink(void)
{
return 0;
}
-void dev_fini_netlink(struct w1_master *dev)
+void w1_fini_netlink(void)
{
}
#endif
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