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739 lines
19 KiB
739 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2003 Evgeniy Polyakov <[email protected]> |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/skbuff.h> |
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#include <linux/netlink.h> |
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#include <linux/connector.h> |
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|
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#include "w1_internal.h" |
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#include "w1_netlink.h" |
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|
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#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE))) |
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|
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/* Bundle together everything required to process a request in one memory |
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* allocation. |
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*/ |
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struct w1_cb_block { |
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atomic_t refcnt; |
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u32 portid; /* Sending process port ID */ |
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/* maximum value for first_cn->len */ |
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u16 maxlen; |
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/* pointers to building up the reply message */ |
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struct cn_msg *first_cn; /* fixed once the structure is populated */ |
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struct cn_msg *cn; /* advances as cn_msg is appeneded */ |
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struct w1_netlink_msg *msg; /* advances as w1_netlink_msg is appened */ |
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struct w1_netlink_cmd *cmd; /* advances as cmds are appened */ |
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struct w1_netlink_msg *cur_msg; /* currently message being processed */ |
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/* copy of the original request follows */ |
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struct cn_msg request_cn; |
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/* followed by variable length: |
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* cn_msg, data (w1_netlink_msg and w1_netlink_cmd) |
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* one or more struct w1_cb_node |
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* reply first_cn, data (w1_netlink_msg and w1_netlink_cmd) |
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*/ |
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}; |
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struct w1_cb_node { |
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struct w1_async_cmd async; |
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/* pointers within w1_cb_block and cn data */ |
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struct w1_cb_block *block; |
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struct w1_netlink_msg *msg; |
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struct w1_slave *sl; |
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struct w1_master *dev; |
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}; |
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|
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/** |
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* w1_reply_len() - calculate current reply length, compare to maxlen |
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* @block: block to calculate |
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* |
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* Calculates the current message length including possible multiple |
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* cn_msg and data, excludes the first sizeof(struct cn_msg). Direclty |
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* compariable to maxlen and usable to send the message. |
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*/ |
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static u16 w1_reply_len(struct w1_cb_block *block) |
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{ |
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if (!block->cn) |
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return 0; |
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return (u8 *)block->cn - (u8 *)block->first_cn + block->cn->len; |
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} |
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static void w1_unref_block(struct w1_cb_block *block) |
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{ |
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if (atomic_sub_return(1, &block->refcnt) == 0) { |
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u16 len = w1_reply_len(block); |
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if (len) { |
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cn_netlink_send_mult(block->first_cn, len, |
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block->portid, 0, GFP_KERNEL); |
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} |
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kfree(block); |
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} |
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} |
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|
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/** |
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* w1_reply_make_space() - send message if needed to make space |
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* @block: block to make space on |
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* @space: how many bytes requested |
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* |
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* Verify there is enough room left for the caller to add "space" bytes to the |
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* message, if there isn't send the message and reset. |
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*/ |
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static void w1_reply_make_space(struct w1_cb_block *block, u16 space) |
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{ |
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u16 len = w1_reply_len(block); |
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if (len + space >= block->maxlen) { |
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cn_netlink_send_mult(block->first_cn, len, block->portid, 0, GFP_KERNEL); |
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block->first_cn->len = 0; |
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block->cn = NULL; |
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block->msg = NULL; |
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block->cmd = NULL; |
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} |
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} |
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/* Early send when replies aren't bundled. */ |
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static void w1_netlink_check_send(struct w1_cb_block *block) |
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{ |
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if (!(block->request_cn.flags & W1_CN_BUNDLE) && block->cn) |
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w1_reply_make_space(block, block->maxlen); |
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} |
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/** |
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* w1_netlink_setup_msg() - prepare to write block->msg |
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* @block: block to operate on |
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* @ack: determines if cn can be reused |
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* |
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* block->cn will be setup with the correct ack, advancing if needed |
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* block->cn->len does not include space for block->msg |
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* block->msg advances but remains uninitialized |
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*/ |
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static void w1_netlink_setup_msg(struct w1_cb_block *block, u32 ack) |
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{ |
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if (block->cn && block->cn->ack == ack) { |
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block->msg = (struct w1_netlink_msg *)(block->cn->data + block->cn->len); |
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} else { |
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/* advance or set to data */ |
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if (block->cn) |
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block->cn = (struct cn_msg *)(block->cn->data + |
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block->cn->len); |
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else |
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block->cn = block->first_cn; |
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|
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memcpy(block->cn, &block->request_cn, sizeof(*block->cn)); |
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block->cn->len = 0; |
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block->cn->ack = ack; |
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block->msg = (struct w1_netlink_msg *)block->cn->data; |
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} |
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} |
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/* Append cmd to msg, include cmd->data as well. This is because |
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* any following data goes with the command and in the case of a read is |
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* the results. |
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*/ |
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static void w1_netlink_queue_cmd(struct w1_cb_block *block, |
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struct w1_netlink_cmd *cmd) |
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{ |
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u32 space; |
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w1_reply_make_space(block, sizeof(struct cn_msg) + |
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sizeof(struct w1_netlink_msg) + sizeof(*cmd) + cmd->len); |
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/* There's a status message sent after each command, so no point |
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* in trying to bundle this cmd after an existing one, because |
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* there won't be one. Allocate and copy over a new cn_msg. |
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*/ |
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w1_netlink_setup_msg(block, block->request_cn.seq + 1); |
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memcpy(block->msg, block->cur_msg, sizeof(*block->msg)); |
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block->cn->len += sizeof(*block->msg); |
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block->msg->len = 0; |
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block->cmd = (struct w1_netlink_cmd *)(block->msg->data); |
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space = sizeof(*cmd) + cmd->len; |
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if (block->cmd != cmd) |
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memcpy(block->cmd, cmd, space); |
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block->cn->len += space; |
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block->msg->len += space; |
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} |
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/* Append req_msg and req_cmd, no other commands and no data from req_cmd are |
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* copied. |
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*/ |
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static void w1_netlink_queue_status(struct w1_cb_block *block, |
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struct w1_netlink_msg *req_msg, struct w1_netlink_cmd *req_cmd, |
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int error) |
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{ |
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u16 space = sizeof(struct cn_msg) + sizeof(*req_msg) + sizeof(*req_cmd); |
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w1_reply_make_space(block, space); |
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w1_netlink_setup_msg(block, block->request_cn.ack); |
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memcpy(block->msg, req_msg, sizeof(*req_msg)); |
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block->cn->len += sizeof(*req_msg); |
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block->msg->len = 0; |
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block->msg->status = (u8)-error; |
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if (req_cmd) { |
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struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)block->msg->data; |
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memcpy(cmd, req_cmd, sizeof(*cmd)); |
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block->cn->len += sizeof(*cmd); |
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block->msg->len += sizeof(*cmd); |
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cmd->len = 0; |
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} |
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w1_netlink_check_send(block); |
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} |
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/** |
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* w1_netlink_send_error() - sends the error message now |
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* @cn: original cn_msg |
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* @msg: original w1_netlink_msg |
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* @portid: where to send it |
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* @error: error status |
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* |
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* Use when a block isn't available to queue the message to and cn, msg |
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* might not be contiguous. |
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*/ |
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static void w1_netlink_send_error(struct cn_msg *cn, struct w1_netlink_msg *msg, |
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int portid, int error) |
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{ |
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struct { |
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struct cn_msg cn; |
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struct w1_netlink_msg msg; |
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} packet; |
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memcpy(&packet.cn, cn, sizeof(packet.cn)); |
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memcpy(&packet.msg, msg, sizeof(packet.msg)); |
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packet.cn.len = sizeof(packet.msg); |
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packet.msg.len = 0; |
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packet.msg.status = (u8)-error; |
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cn_netlink_send(&packet.cn, portid, 0, GFP_KERNEL); |
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} |
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/** |
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* w1_netlink_send() - sends w1 netlink notifications |
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* @dev: w1_master the even is associated with or for |
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* @msg: w1_netlink_msg message to be sent |
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* |
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* This are notifications generated from the kernel. |
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*/ |
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void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) |
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{ |
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struct { |
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struct cn_msg cn; |
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struct w1_netlink_msg msg; |
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} packet; |
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memset(&packet, 0, sizeof(packet)); |
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packet.cn.id.idx = CN_W1_IDX; |
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packet.cn.id.val = CN_W1_VAL; |
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packet.cn.seq = dev->seq++; |
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packet.cn.len = sizeof(*msg); |
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memcpy(&packet.msg, msg, sizeof(*msg)); |
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packet.msg.len = 0; |
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cn_netlink_send(&packet.cn, 0, 0, GFP_KERNEL); |
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} |
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static void w1_send_slave(struct w1_master *dev, u64 rn) |
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{ |
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struct w1_cb_block *block = dev->priv; |
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struct w1_netlink_cmd *cache_cmd = block->cmd; |
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u64 *data; |
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w1_reply_make_space(block, sizeof(*data)); |
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/* Add cmd back if the packet was sent */ |
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if (!block->cmd) { |
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cache_cmd->len = 0; |
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w1_netlink_queue_cmd(block, cache_cmd); |
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} |
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data = (u64 *)(block->cmd->data + block->cmd->len); |
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*data = rn; |
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block->cn->len += sizeof(*data); |
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block->msg->len += sizeof(*data); |
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block->cmd->len += sizeof(*data); |
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} |
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static void w1_found_send_slave(struct w1_master *dev, u64 rn) |
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{ |
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/* update kernel slave list */ |
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w1_slave_found(dev, rn); |
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w1_send_slave(dev, rn); |
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} |
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/* Get the current slave list, or search (with or without alarm) */ |
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static int w1_get_slaves(struct w1_master *dev, struct w1_netlink_cmd *req_cmd) |
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{ |
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struct w1_slave *sl; |
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req_cmd->len = 0; |
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w1_netlink_queue_cmd(dev->priv, req_cmd); |
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if (req_cmd->cmd == W1_CMD_LIST_SLAVES) { |
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u64 rn; |
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mutex_lock(&dev->list_mutex); |
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list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
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memcpy(&rn, &sl->reg_num, sizeof(rn)); |
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w1_send_slave(dev, rn); |
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} |
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mutex_unlock(&dev->list_mutex); |
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} else { |
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w1_search_process_cb(dev, req_cmd->cmd == W1_CMD_ALARM_SEARCH ? |
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W1_ALARM_SEARCH : W1_SEARCH, w1_found_send_slave); |
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} |
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return 0; |
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} |
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static int w1_process_command_io(struct w1_master *dev, |
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struct w1_netlink_cmd *cmd) |
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{ |
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int err = 0; |
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switch (cmd->cmd) { |
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case W1_CMD_TOUCH: |
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w1_touch_block(dev, cmd->data, cmd->len); |
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w1_netlink_queue_cmd(dev->priv, cmd); |
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break; |
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case W1_CMD_READ: |
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w1_read_block(dev, cmd->data, cmd->len); |
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w1_netlink_queue_cmd(dev->priv, cmd); |
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break; |
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case W1_CMD_WRITE: |
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w1_write_block(dev, cmd->data, cmd->len); |
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break; |
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default: |
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err = -EINVAL; |
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break; |
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} |
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return err; |
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} |
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static int w1_process_command_addremove(struct w1_master *dev, |
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struct w1_netlink_cmd *cmd) |
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{ |
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struct w1_slave *sl; |
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int err = 0; |
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struct w1_reg_num *id; |
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if (cmd->len != sizeof(*id)) |
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return -EINVAL; |
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id = (struct w1_reg_num *)cmd->data; |
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sl = w1_slave_search_device(dev, id); |
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switch (cmd->cmd) { |
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case W1_CMD_SLAVE_ADD: |
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if (sl) |
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err = -EINVAL; |
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else |
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err = w1_attach_slave_device(dev, id); |
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break; |
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case W1_CMD_SLAVE_REMOVE: |
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if (sl) |
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w1_slave_detach(sl); |
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else |
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err = -EINVAL; |
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break; |
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default: |
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err = -EINVAL; |
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break; |
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} |
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return err; |
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} |
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static int w1_process_command_master(struct w1_master *dev, |
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struct w1_netlink_cmd *req_cmd) |
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{ |
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int err = -EINVAL; |
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/* drop bus_mutex for search (does it's own locking), and add/remove |
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* which doesn't use the bus |
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*/ |
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switch (req_cmd->cmd) { |
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case W1_CMD_SEARCH: |
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case W1_CMD_ALARM_SEARCH: |
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case W1_CMD_LIST_SLAVES: |
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mutex_unlock(&dev->bus_mutex); |
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err = w1_get_slaves(dev, req_cmd); |
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mutex_lock(&dev->bus_mutex); |
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break; |
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case W1_CMD_READ: |
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case W1_CMD_WRITE: |
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case W1_CMD_TOUCH: |
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err = w1_process_command_io(dev, req_cmd); |
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break; |
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case W1_CMD_RESET: |
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err = w1_reset_bus(dev); |
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break; |
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case W1_CMD_SLAVE_ADD: |
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case W1_CMD_SLAVE_REMOVE: |
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mutex_unlock(&dev->bus_mutex); |
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mutex_lock(&dev->mutex); |
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err = w1_process_command_addremove(dev, req_cmd); |
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mutex_unlock(&dev->mutex); |
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mutex_lock(&dev->bus_mutex); |
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break; |
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default: |
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err = -EINVAL; |
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break; |
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} |
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return err; |
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} |
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static int w1_process_command_slave(struct w1_slave *sl, |
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struct w1_netlink_cmd *cmd) |
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{ |
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dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n", |
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__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, |
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sl->reg_num.crc, cmd->cmd, cmd->len); |
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return w1_process_command_io(sl->master, cmd); |
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} |
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static int w1_process_command_root(struct cn_msg *req_cn, u32 portid) |
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{ |
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struct w1_master *dev; |
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struct cn_msg *cn; |
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struct w1_netlink_msg *msg; |
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u32 *id; |
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cn = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (!cn) |
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return -ENOMEM; |
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cn->id.idx = CN_W1_IDX; |
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cn->id.val = CN_W1_VAL; |
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cn->seq = req_cn->seq; |
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cn->ack = req_cn->seq + 1; |
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cn->len = sizeof(struct w1_netlink_msg); |
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msg = (struct w1_netlink_msg *)cn->data; |
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msg->type = W1_LIST_MASTERS; |
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msg->status = 0; |
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msg->len = 0; |
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id = (u32 *)msg->data; |
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mutex_lock(&w1_mlock); |
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list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
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if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) { |
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cn_netlink_send(cn, portid, 0, GFP_KERNEL); |
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cn->len = sizeof(struct w1_netlink_msg); |
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msg->len = 0; |
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id = (u32 *)msg->data; |
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} |
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*id = dev->id; |
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msg->len += sizeof(*id); |
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cn->len += sizeof(*id); |
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id++; |
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} |
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cn_netlink_send(cn, portid, 0, GFP_KERNEL); |
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mutex_unlock(&w1_mlock); |
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kfree(cn); |
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return 0; |
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} |
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static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd) |
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{ |
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struct w1_cb_node *node = container_of(async_cmd, struct w1_cb_node, |
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async); |
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u16 mlen = node->msg->len; |
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u16 len; |
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int err = 0; |
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struct w1_slave *sl = node->sl; |
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struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)node->msg->data; |
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|
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mutex_lock(&dev->bus_mutex); |
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dev->priv = node->block; |
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if (sl && w1_reset_select_slave(sl)) |
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err = -ENODEV; |
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node->block->cur_msg = node->msg; |
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|
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while (mlen && !err) { |
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if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) { |
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err = -E2BIG; |
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break; |
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} |
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|
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if (sl) |
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err = w1_process_command_slave(sl, cmd); |
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else |
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err = w1_process_command_master(dev, cmd); |
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w1_netlink_check_send(node->block); |
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|
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w1_netlink_queue_status(node->block, node->msg, cmd, err); |
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err = 0; |
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|
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len = sizeof(*cmd) + cmd->len; |
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cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len); |
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mlen -= len; |
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} |
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|
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if (!cmd || err) |
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w1_netlink_queue_status(node->block, node->msg, cmd, err); |
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|
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/* ref taken in w1_search_slave or w1_search_master_id when building |
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* the block |
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*/ |
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if (sl) |
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w1_unref_slave(sl); |
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else |
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atomic_dec(&dev->refcnt); |
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dev->priv = NULL; |
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mutex_unlock(&dev->bus_mutex); |
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|
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mutex_lock(&dev->list_mutex); |
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list_del(&async_cmd->async_entry); |
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mutex_unlock(&dev->list_mutex); |
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|
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w1_unref_block(node->block); |
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} |
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|
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static void w1_list_count_cmds(struct w1_netlink_msg *msg, int *cmd_count, |
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u16 *slave_len) |
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{ |
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struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)msg->data; |
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u16 mlen = msg->len; |
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u16 len; |
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int slave_list = 0; |
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while (mlen) { |
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if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) |
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break; |
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|
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switch (cmd->cmd) { |
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case W1_CMD_SEARCH: |
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case W1_CMD_ALARM_SEARCH: |
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case W1_CMD_LIST_SLAVES: |
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++slave_list; |
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} |
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++*cmd_count; |
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len = sizeof(*cmd) + cmd->len; |
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cmd = (struct w1_netlink_cmd *)((u8 *)cmd + len); |
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mlen -= len; |
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} |
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|
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if (slave_list) { |
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struct w1_master *dev = w1_search_master_id(msg->id.mst.id); |
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if (dev) { |
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/* Bytes, and likely an overstimate, and if it isn't |
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* the results can still be split between packets. |
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*/ |
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*slave_len += sizeof(struct w1_reg_num) * slave_list * |
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(dev->slave_count + dev->max_slave_count); |
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/* search incremented it */ |
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atomic_dec(&dev->refcnt); |
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} |
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} |
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} |
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|
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static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp) |
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{ |
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struct w1_netlink_msg *msg = (struct w1_netlink_msg *)(cn + 1); |
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struct w1_slave *sl; |
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struct w1_master *dev; |
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u16 msg_len; |
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u16 slave_len = 0; |
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int err = 0; |
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struct w1_cb_block *block = NULL; |
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struct w1_cb_node *node = NULL; |
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int node_count = 0; |
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int cmd_count = 0; |
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|
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/* If any unknown flag is set let the application know, that way |
|
* applications can detect the absence of features in kernels that |
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* don't know about them. http://lwn.net/Articles/587527/ |
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*/ |
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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; |
|
} |
|
|
|
/* 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; |
|
|
|
if (msg->len + sizeof(struct w1_netlink_msg) > msg_len) { |
|
err = -E2BIG; |
|
break; |
|
} |
|
|
|
/* 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 { |
|
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; |
|
} |
|
|
|
if (!dev) { |
|
err = -ENODEV; |
|
goto out_cont; |
|
} |
|
|
|
err = 0; |
|
|
|
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; |
|
|
|
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; |
|
|
|
out_cont: |
|
/* 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) |
|
{ |
|
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 *cn) |
|
{ |
|
} |
|
|
|
int w1_init_netlink(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
void w1_fini_netlink(void) |
|
{ |
|
} |
|
#endif
|
|
|