#include "w1_netlink.h"
#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)
-{
- 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);
-
- memset(buf, 0, sizeof(buf));
- m->id.idx = CN_W1_IDX;
- m->id.val = CN_W1_VAL;
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
- m->seq = dev->seq++;
- m->len = sizeof(struct w1_netlink_msg);
+/* Bundle together everything required to process a request in one memory
+ * allocation.
+ */
+struct w1_cb_block {
+ atomic_t refcnt;
+ u32 portid; /* Sending process port ID */
+ /* maximum value for first_cn->len */
+ u16 maxlen;
+ /* pointers to building up the reply message */
+ struct cn_msg *first_cn; /* fixed once the structure is populated */
+ struct cn_msg *cn; /* advances as cn_msg is appeneded */
+ struct w1_netlink_msg *msg; /* advances as w1_netlink_msg is appened */
+ struct w1_netlink_cmd *cmd; /* advances as cmds are appened */
+ struct w1_netlink_msg *cur_msg; /* currently message being processed */
+ /* copy of the original request follows */
+ struct cn_msg request_cn;
+ /* followed by variable length:
+ * cn_msg, data (w1_netlink_msg and w1_netlink_cmd)
+ * one or more struct w1_cb_node
+ * reply first_cn, data (w1_netlink_msg and w1_netlink_cmd)
+ */
+};
+struct w1_cb_node {
+ struct w1_async_cmd async;
+ /* pointers within w1_cb_block and cn data */
+ struct w1_cb_block *block;
+ struct w1_netlink_msg *msg;
+ struct w1_slave *sl;
+ struct w1_master *dev;
+};
- memcpy(w, msg, sizeof(struct w1_netlink_msg));
+/**
+ * w1_reply_len() - calculate current reply length, compare to maxlen
+ * @block: block to calculate
+ *
+ * Calculates the current message length including possible multiple
+ * cn_msg and data, excludes the first sizeof(struct cn_msg). Direclty
+ * compariable to maxlen and usable to send the message.
+ */
+static u16 w1_reply_len(struct w1_cb_block *block)
+{
+ if (!block->cn)
+ return 0;
+ return (u8 *)block->cn - (u8 *)block->first_cn + block->cn->len;
+}
- cn_netlink_send(m, 0, GFP_KERNEL);
+static void w1_unref_block(struct w1_cb_block *block)
+{
+ if (atomic_sub_return(1, &block->refcnt) == 0) {
+ u16 len = w1_reply_len(block);
+ if (len) {
+ cn_netlink_send_mult(block->first_cn, len,
+ block->portid, 0, GFP_KERNEL);
+ }
+ kfree(block);
+ }
}
-static void w1_send_slave(struct w1_master *dev, u64 rn)
+/**
+ * w1_reply_make_space() - send message if needed to make space
+ * @block: block to make space on
+ * @space: how many bytes requested
+ *
+ * Verify there is enough room left for the caller to add "space" bytes to the
+ * message, if there isn't send the message and reset.
+ */
+static void w1_reply_make_space(struct w1_cb_block *block, u16 space)
{
- 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;
- u64 *data;
+ u16 len = w1_reply_len(block);
+ if (len + space >= block->maxlen) {
+ cn_netlink_send_mult(block->first_cn, len, block->portid, 0, GFP_KERNEL);
+ block->first_cn->len = 0;
+ block->cn = NULL;
+ block->msg = NULL;
+ block->cmd = NULL;
+ }
+}
- /* update kernel slave list */
- w1_slave_found(dev, rn);
+/* Early send when replies aren't bundled. */
+static void w1_netlink_check_send(struct w1_cb_block *block)
+{
+ if (!(block->request_cn.flags & W1_CN_BUNDLE) && block->cn)
+ w1_reply_make_space(block, block->maxlen);
+}
- avail = dev->priv_size - cmd->len;
+/**
+ * w1_netlink_setup_msg() - prepare to write block->msg
+ * @block: block to operate on
+ * @ack: determines if cn can be reused
+ *
+ * block->cn will be setup with the correct ack, advancing if needed
+ * block->cn->len does not include space for block->msg
+ * block->msg advances but remains uninitialized
+ */
+static void w1_netlink_setup_msg(struct w1_cb_block *block, u32 ack)
+{
+ if (block->cn && block->cn->ack == ack) {
+ block->msg = (struct w1_netlink_msg *)(block->cn->data + block->cn->len);
+ } else {
+ /* advance or set to data */
+ if (block->cn)
+ block->cn = (struct cn_msg *)(block->cn->data +
+ block->cn->len);
+ else
+ block->cn = block->first_cn;
+
+ memcpy(block->cn, &block->request_cn, sizeof(*block->cn));
+ block->cn->len = 0;
+ block->cn->ack = ack;
+ block->msg = (struct w1_netlink_msg *)block->cn->data;
+ }
+}
- if (avail < 8) {
- msg->ack++;
- cn_netlink_send(msg, 0, GFP_KERNEL);
+/* Append cmd to msg, include cmd->data as well. This is because
+ * any following data goes with the command and in the case of a read is
+ * the results.
+ */
+static void w1_netlink_queue_cmd(struct w1_cb_block *block,
+ struct w1_netlink_cmd *cmd)
+{
+ u32 space;
+ w1_reply_make_space(block, sizeof(struct cn_msg) +
+ sizeof(struct w1_netlink_msg) + sizeof(*cmd) + cmd->len);
+
+ /* There's a status message sent after each command, so no point
+ * in trying to bundle this cmd after an existing one, because
+ * there won't be one. Allocate and copy over a new cn_msg.
+ */
+ w1_netlink_setup_msg(block, block->request_cn.seq + 1);
+ memcpy(block->msg, block->cur_msg, sizeof(*block->msg));
+ block->cn->len += sizeof(*block->msg);
+ block->msg->len = 0;
+ block->cmd = (struct w1_netlink_cmd *)(block->msg->data);
+
+ space = sizeof(*cmd) + cmd->len;
+ if (block->cmd != cmd)
+ memcpy(block->cmd, cmd, space);
+ block->cn->len += space;
+ block->msg->len += space;
+}
- msg->len = sizeof(struct w1_netlink_msg) +
- sizeof(struct w1_netlink_cmd);
- hdr->len = sizeof(struct w1_netlink_cmd);
+/* Append req_msg and req_cmd, no other commands and no data from req_cmd are
+ * copied.
+ */
+static void w1_netlink_queue_status(struct w1_cb_block *block,
+ struct w1_netlink_msg *req_msg, struct w1_netlink_cmd *req_cmd,
+ int error)
+{
+ u16 space = sizeof(struct cn_msg) + sizeof(*req_msg) + sizeof(*req_cmd);
+ w1_reply_make_space(block, space);
+ w1_netlink_setup_msg(block, block->request_cn.ack);
+
+ memcpy(block->msg, req_msg, sizeof(*req_msg));
+ block->cn->len += sizeof(*req_msg);
+ block->msg->len = 0;
+ block->msg->status = (u8)-error;
+ if (req_cmd) {
+ struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)block->msg->data;
+ memcpy(cmd, req_cmd, sizeof(*cmd));
+ block->cn->len += sizeof(*cmd);
+ block->msg->len += sizeof(*cmd);
cmd->len = 0;
}
-
- data = (void *)(cmd + 1) + cmd->len;
-
- *data = rn;
- cmd->len += 8;
- hdr->len += 8;
- msg->len += 8;
+ w1_netlink_check_send(block);
}
-static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
- unsigned int avail)
+/**
+ * w1_netlink_send_error() - sends the error message now
+ * @cn: original cn_msg
+ * @msg: original w1_netlink_msg
+ * @portid: where to send it
+ * @error: error status
+ *
+ * Use when a block isn't available to queue the message to and cn, msg
+ * might not be contiguous.
+ */
+static void w1_netlink_send_error(struct cn_msg *cn, struct w1_netlink_msg *msg,
+ int portid, int error)
{
- 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;
+ struct {
+ struct cn_msg cn;
+ struct w1_netlink_msg msg;
+ } packet;
+ memcpy(&packet.cn, cn, sizeof(packet.cn));
+ memcpy(&packet.msg, msg, sizeof(packet.msg));
+ packet.cn.len = sizeof(packet.msg);
+ packet.msg.len = 0;
+ packet.msg.status = (u8)-error;
+ cn_netlink_send(&packet.cn, portid, 0, GFP_KERNEL);
+}
- dev->priv = msg;
- dev->priv_size = avail;
+/**
+ * w1_netlink_send() - sends w1 netlink notifications
+ * @dev: w1_master the even is associated with or for
+ * @msg: w1_netlink_msg message to be sent
+ *
+ * This are notifications generated from the kernel.
+ */
+void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
+{
+ struct {
+ struct cn_msg cn;
+ struct w1_netlink_msg msg;
+ } packet;
+ memset(&packet, 0, sizeof(packet));
- w1_search_process_cb(dev, search_type, w1_send_slave);
+ packet.cn.id.idx = CN_W1_IDX;
+ packet.cn.id.val = CN_W1_VAL;
- msg->ack = 0;
- cn_netlink_send(msg, 0, GFP_KERNEL);
+ packet.cn.seq = dev->seq++;
+ packet.cn.len = sizeof(*msg);
- dev->priv = NULL;
- dev->priv_size = 0;
+ memcpy(&packet.msg, msg, sizeof(*msg));
+ packet.msg.len = 0;
- return 0;
+ cn_netlink_send(&packet.cn, 0, 0, GFP_KERNEL);
}
-static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
- struct w1_netlink_cmd *cmd)
+static void w1_send_slave(struct w1_master *dev, u64 rn)
{
- 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;
+ struct w1_cb_block *block = dev->priv;
+ struct w1_netlink_cmd *cache_cmd = block->cmd;
+ u64 *data;
+
+ w1_reply_make_space(block, sizeof(*data));
- cm = (struct cn_msg *)(data);
- h = (struct w1_netlink_msg *)(cm + 1);
- c = (struct w1_netlink_cmd *)(h + 1);
+ /* Add cmd back if the packet was sent */
+ if (!block->cmd) {
+ cache_cmd->len = 0;
+ w1_netlink_queue_cmd(block, cache_cmd);
+ }
- memcpy(cm, msg, sizeof(struct cn_msg));
- memcpy(h, hdr, sizeof(struct w1_netlink_msg));
- memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
+ data = (u64 *)(block->cmd->data + block->cmd->len);
- cm->ack = msg->seq+1;
- cm->len = sizeof(struct w1_netlink_msg) +
- sizeof(struct w1_netlink_cmd) + cmd->len;
+ *data = rn;
+ block->cn->len += sizeof(*data);
+ block->msg->len += sizeof(*data);
+ block->cmd->len += sizeof(*data);
+}
+
+static void w1_found_send_slave(struct w1_master *dev, u64 rn)
+{
+ /* update kernel slave list */
+ w1_slave_found(dev, rn);
- h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
+ w1_send_slave(dev, rn);
+}
- memcpy(c->data, cmd->data, c->len);
+/* Get the current slave list, or search (with or without alarm) */
+static int w1_get_slaves(struct w1_master *dev, struct w1_netlink_cmd *req_cmd)
+{
+ struct w1_slave *sl;
- err = cn_netlink_send(cm, 0, GFP_KERNEL);
+ req_cmd->len = 0;
+ w1_netlink_queue_cmd(dev->priv, req_cmd);
- kfree(data);
+ if (req_cmd->cmd == W1_CMD_LIST_SLAVES) {
+ u64 rn;
+ mutex_lock(&dev->list_mutex);
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
+ memcpy(&rn, &sl->reg_num, sizeof(rn));
+ w1_send_slave(dev, rn);
+ }
+ mutex_unlock(&dev->list_mutex);
+ } else {
+ w1_search_process_cb(dev, req_cmd->cmd == W1_CMD_ALARM_SEARCH ?
+ W1_ALARM_SEARCH : W1_SEARCH, w1_found_send_slave);
+ }
- return err;
+ return 0;
}
-static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
- struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+static int w1_process_command_io(struct w1_master *dev,
+ 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);
+ w1_netlink_queue_cmd(dev->priv, cmd);
break;
case W1_CMD_READ:
w1_read_block(dev, cmd->data, cmd->len);
- w1_send_read_reply(msg, hdr, cmd);
+ w1_netlink_queue_cmd(dev->priv, cmd);
break;
case W1_CMD_WRITE:
w1_write_block(dev, cmd->data, cmd->len);
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)
+static int w1_process_command_addremove(struct w1_master *dev,
+ struct w1_netlink_cmd *cmd)
{
- int err = -EINVAL;
- struct cn_msg *msg;
- struct w1_netlink_msg *hdr;
- struct w1_netlink_cmd *cmd;
+ struct w1_slave *sl;
+ int err = 0;
+ struct w1_reg_num *id;
- msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
- if (!msg)
- return -ENOMEM;
+ if (cmd->len != sizeof(*id))
+ return -EINVAL;
- 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);
+ id = (struct w1_reg_num *)cmd->data;
- hdr = (struct w1_netlink_msg *)(msg + 1);
- cmd = (struct w1_netlink_cmd *)(hdr + 1);
+ sl = w1_slave_search_device(dev, id);
+ switch (cmd->cmd) {
+ case W1_CMD_SLAVE_ADD:
+ if (sl)
+ err = -EINVAL;
+ else
+ err = w1_attach_slave_device(dev, id);
+ break;
+ case W1_CMD_SLAVE_REMOVE:
+ if (sl)
+ w1_slave_detach(sl);
+ else
+ err = -EINVAL;
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
- hdr->type = W1_MASTER_CMD;
- hdr->id = req_hdr->id;
- hdr->len = sizeof(struct w1_netlink_cmd);
+ return err;
+}
- cmd->cmd = req_cmd->cmd;
- cmd->len = 0;
+static int w1_process_command_master(struct w1_master *dev,
+ struct w1_netlink_cmd *req_cmd)
+{
+ int err = -EINVAL;
- switch (cmd->cmd) {
+ /* drop bus_mutex for search (does it's own locking), and add/remove
+ * which doesn't use the bus
+ */
+ switch (req_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));
+ case W1_CMD_LIST_SLAVES:
+ mutex_unlock(&dev->bus_mutex);
+ err = w1_get_slaves(dev, req_cmd);
+ mutex_lock(&dev->bus_mutex);
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);
+ err = w1_process_command_io(dev, req_cmd);
break;
case W1_CMD_RESET:
err = w1_reset_bus(dev);
break;
+ case W1_CMD_SLAVE_ADD:
+ case W1_CMD_SLAVE_REMOVE:
+ mutex_unlock(&dev->bus_mutex);
+ mutex_lock(&dev->mutex);
+ err = w1_process_command_addremove(dev, req_cmd);
+ mutex_unlock(&dev->mutex);
+ mutex_lock(&dev->bus_mutex);
+ break;
default:
err = -EINVAL;
break;
}
- kfree(msg);
return err;
}
-static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
- struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+static int w1_process_command_slave(struct w1_slave *sl,
+ 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);
- return w1_process_command_io(sl->master, msg, hdr, cmd);
+ return w1_process_command_io(sl->master, cmd);
}
-static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
+static int w1_process_command_root(struct cn_msg *req_cn, u32 portid)
{
- struct w1_master *m;
+ struct w1_master *dev;
struct cn_msg *cn;
- struct w1_netlink_msg *w;
+ struct w1_netlink_msg *msg;
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->seq = req_cn->seq;
+ cn->ack = req_cn->seq + 1;
cn->len = sizeof(struct w1_netlink_msg);
- w = (struct w1_netlink_msg *)(cn + 1);
+ msg = (struct w1_netlink_msg *)cn->data;
- w->type = W1_LIST_MASTERS;
- w->status = 0;
- w->len = 0;
- id = (u32 *)(w + 1);
+ msg->type = W1_LIST_MASTERS;
+ msg->status = 0;
+ msg->len = 0;
+ id = (u32 *)msg->data;
mutex_lock(&w1_mlock);
- list_for_each_entry(m, &w1_masters, w1_master_entry) {
+ list_for_each_entry(dev, &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_netlink_send(cn, portid, 0, GFP_KERNEL);
cn->len = sizeof(struct w1_netlink_msg);
- w->len = 0;
- id = (u32 *)(w + 1);
+ msg->len = 0;
+ id = (u32 *)msg->data;
}
- *id = m->id;
- w->len += sizeof(*id);
+ *id = dev->id;
+ msg->len += sizeof(*id);
cn->len += sizeof(*id);
id++;
}
- cn->ack = 0;
- cn_netlink_send(cn, 0, GFP_KERNEL);
+ cn_netlink_send(cn, portid, 0, GFP_KERNEL);
mutex_unlock(&w1_mlock);
kfree(cn);
return 0;
}
-static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
- struct w1_netlink_cmd *rcmd, int error)
+static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
{
- struct cn_msg *cmsg;
- struct w1_netlink_msg *msg;
- struct w1_netlink_cmd *cmd;
+ struct w1_cb_node *node = container_of(async_cmd, struct w1_cb_node,
+ async);
+ u16 mlen = node->msg->len;
+ u16 len;
+ int err = 0;
+ struct w1_slave *sl = node->sl;
+ struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)node->msg->data;
- cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL);
- if (!cmsg)
- return -ENOMEM;
+ mutex_lock(&dev->bus_mutex);
+ dev->priv = node->block;
+ if (sl && w1_reset_select_slave(sl))
+ err = -ENODEV;
+ node->block->cur_msg = node->msg;
- msg = (struct w1_netlink_msg *)(cmsg + 1);
- cmd = (struct w1_netlink_cmd *)(msg + 1);
+ while (mlen && !err) {
+ if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
+ err = -E2BIG;
+ break;
+ }
- memcpy(cmsg, rcmsg, sizeof(*cmsg));
- cmsg->len = sizeof(*msg);
+ if (sl)
+ err = w1_process_command_slave(sl, cmd);
+ else
+ err = w1_process_command_master(dev, cmd);
+ w1_netlink_check_send(node->block);
- memcpy(msg, rmsg, sizeof(*msg));
- msg->len = 0;
- msg->status = (short)-error;
+ w1_netlink_queue_status(node->block, node->msg, cmd, err);
+ err = 0;
- if (rcmd) {
- memcpy(cmd, rcmd, sizeof(*cmd));
- cmd->len = 0;
- msg->len += sizeof(*cmd);
- cmsg->len += sizeof(*cmd);
+ len = sizeof(*cmd) + cmd->len;
+ cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len);
+ mlen -= len;
}
- error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
- kfree(cmsg);
+ if (!cmd || err)
+ w1_netlink_queue_status(node->block, node->msg, cmd, err);
- return error;
+ /* ref taken in w1_search_slave or w1_search_master_id when building
+ * the block
+ */
+ if (sl)
+ w1_unref_slave(sl);
+ else
+ atomic_dec(&dev->refcnt);
+ dev->priv = NULL;
+ mutex_unlock(&dev->bus_mutex);
+
+ mutex_lock(&dev->list_mutex);
+ list_del(&async_cmd->async_entry);
+ mutex_unlock(&dev->list_mutex);
+
+ w1_unref_block(node->block);
+}
+
+static void w1_list_count_cmds(struct w1_netlink_msg *msg, int *cmd_count,
+ u16 *slave_len)
+{
+ struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)msg->data;
+ u16 mlen = msg->len;
+ u16 len;
+ int slave_list = 0;
+ while (mlen) {
+ if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen)
+ break;
+
+ switch (cmd->cmd) {
+ case W1_CMD_SEARCH:
+ case W1_CMD_ALARM_SEARCH:
+ case W1_CMD_LIST_SLAVES:
+ ++slave_list;
+ }
+ ++*cmd_count;
+ len = sizeof(*cmd) + cmd->len;
+ cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len);
+ mlen -= len;
+ }
+
+ if (slave_list) {
+ struct w1_master *dev = w1_search_master_id(msg->id.mst.id);
+ if (dev) {
+ /* Bytes, and likely an overstimate, and if it isn't
+ * the results can still be split between packets.
+ */
+ *slave_len += sizeof(struct w1_reg_num) * slave_list *
+ (dev->slave_count + dev->max_slave_count);
+ /* search incremented it */
+ atomic_dec(&dev->refcnt);
+ }
+ }
}
-static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp)
{
- struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
- struct w1_netlink_cmd *cmd;
+ struct w1_netlink_msg *msg = (struct w1_netlink_msg *)(cn + 1);
struct w1_slave *sl;
struct w1_master *dev;
+ u16 msg_len;
+ u16 slave_len = 0;
int err = 0;
+ struct w1_cb_block *block = NULL;
+ struct w1_cb_node *node = NULL;
+ int node_count = 0;
+ int cmd_count = 0;
+
+ /* If any unknown flag is set let the application know, that way
+ * applications can detect the absence of features in kernels that
+ * don't know about them. http://lwn.net/Articles/587527/
+ */
+ if (cn->flags & ~(W1_CN_BUNDLE)) {
+ w1_netlink_send_error(cn, msg, nsp->portid, -EINVAL);
+ return;
+ }
+
+ /* Count the number of master or slave commands there are to allocate
+ * space for one cb_node each.
+ */
+ msg_len = cn->len;
+ while (msg_len && !err) {
+ if (msg->len + sizeof(struct w1_netlink_msg) > msg_len) {
+ err = -E2BIG;
+ break;
+ }
- while (msg->len && !err) {
- struct w1_reg_num id;
- u16 mlen = m->len;
- u8 *cmd_data = m->data;
+ /* count messages for nodes and allocate any additional space
+ * required for slave lists
+ */
+ if (msg->type == W1_MASTER_CMD || msg->type == W1_SLAVE_CMD) {
+ ++node_count;
+ w1_list_count_cmds(msg, &cmd_count, &slave_len);
+ }
+
+ msg_len -= sizeof(struct w1_netlink_msg) + msg->len;
+ msg = (struct w1_netlink_msg *)(((u8 *)msg) +
+ sizeof(struct w1_netlink_msg) + msg->len);
+ }
+ msg = (struct w1_netlink_msg *)(cn + 1);
+ if (node_count) {
+ int size;
+ int reply_size = sizeof(*cn) + cn->len + slave_len;
+ if (cn->flags & W1_CN_BUNDLE) {
+ /* bundling duplicats some of the messages */
+ reply_size += 2 * cmd_count * (sizeof(struct cn_msg) +
+ sizeof(struct w1_netlink_msg) +
+ sizeof(struct w1_netlink_cmd));
+ }
+ reply_size = MIN(CONNECTOR_MAX_MSG_SIZE, reply_size);
+
+ /* allocate space for the block, a copy of the original message,
+ * one node per cmd to point into the original message,
+ * space for replies which is the original message size plus
+ * space for any list slave data and status messages
+ * cn->len doesn't include itself which is part of the block
+ * */
+ size = /* block + original message */
+ sizeof(struct w1_cb_block) + sizeof(*cn) + cn->len +
+ /* space for nodes */
+ node_count * sizeof(struct w1_cb_node) +
+ /* replies */
+ sizeof(struct cn_msg) + reply_size;
+ block = kzalloc(size, GFP_KERNEL);
+ if (!block) {
+ /* if the system is already out of memory,
+ * (A) will this work, and (B) would it be better
+ * to not try?
+ */
+ w1_netlink_send_error(cn, msg, nsp->portid, -ENOMEM);
+ return;
+ }
+ atomic_set(&block->refcnt, 1);
+ block->portid = nsp->portid;
+ memcpy(&block->request_cn, cn, sizeof(*cn) + cn->len);
+ node = (struct w1_cb_node *)(block->request_cn.data + cn->len);
+
+ /* Sneeky, when not bundling, reply_size is the allocated space
+ * required for the reply, cn_msg isn't part of maxlen so
+ * it should be reply_size - sizeof(struct cn_msg), however
+ * when checking if there is enough space, w1_reply_make_space
+ * is called with the full message size including cn_msg,
+ * because it isn't known at that time if an additional cn_msg
+ * will need to be allocated. So an extra cn_msg is added
+ * above in "size".
+ */
+ block->maxlen = reply_size;
+ block->first_cn = (struct cn_msg *)(node + node_count);
+ memset(block->first_cn, 0, sizeof(*block->first_cn));
+ }
+
+ msg_len = cn->len;
+ while (msg_len && !err) {
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) {
+ if (msg->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);
+ /* execute on this thread, no need to process later */
+ if (msg->type == W1_LIST_MASTERS) {
+ err = w1_process_command_root(cn, nsp->portid);
+ goto out_cont;
+ }
+
+ /* All following message types require additional data,
+ * check here before references are taken.
+ */
+ if (!msg->len) {
+ err = -EPROTO;
+ goto out_cont;
+ }
+
+ /* both search calls take references */
+ if (msg->type == W1_MASTER_CMD) {
+ dev = w1_search_master_id(msg->id.mst.id);
+ } else if (msg->type == W1_SLAVE_CMD) {
+ sl = w1_search_slave((struct w1_reg_num *)msg->id.id);
if (sl)
dev = sl->master;
} else {
- err = w1_process_command_root(msg, m);
+ pr_notice("%s: cn: %x.%x, wrong type: %u, len: %u.\n",
+ __func__, cn->id.idx, cn->id.val,
+ msg->type, msg->len);
+ err = -EPROTO;
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;
- }
+ atomic_inc(&block->refcnt);
+ node->async.cb = w1_process_cb;
+ node->block = block;
+ node->msg = (struct w1_netlink_msg *)((u8 *)&block->request_cn +
+ (size_t)((u8 *)msg - (u8 *)cn));
+ node->sl = sl;
+ node->dev = dev;
- while (mlen) {
- cmd = (struct w1_netlink_cmd *)cmd_data;
+ mutex_lock(&dev->list_mutex);
+ list_add_tail(&node->async.async_entry, &dev->async_list);
+ wake_up_process(dev->thread);
+ mutex_unlock(&dev->list_mutex);
+ ++node;
- 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);
+ /* Can't queue because that modifies block and another
+ * thread could be processing the messages by now and
+ * there isn't a lock, send directly.
+ */
+ if (err)
+ w1_netlink_send_error(cn, msg, nsp->portid, err);
+ msg_len -= sizeof(struct w1_netlink_msg) + msg->len;
+ msg = (struct w1_netlink_msg *)(((u8 *)msg) +
+ sizeof(struct w1_netlink_msg) + msg->len);
/*
* Let's allow requests for nonexisting devices.
if (err == -ENODEV)
err = 0;
}
+ if (block)
+ w1_unref_block(block);
}
int w1_init_netlink(void)
cn_del_callback(&w1_id);
}
#else
-void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
+void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *cn)
{
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff