/* * w1_netlink.c * * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru> * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/skbuff.h> #include <linux/netlink.h> #include <linux/connector.h> #include "w1.h" #include "w1_log.h" #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; 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); } static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg, struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) { dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n", __func__, dev->name, cmd->cmd, cmd->len); if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH) return -EINVAL; w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH); return 0; } static int w1_send_read_reply(struct w1_slave *sl, 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_slave(struct w1_slave *sl, struct cn_msg *msg, struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) { int err = 0; 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); switch (cmd->cmd) { case W1_CMD_READ: w1_read_block(sl->master, cmd->data, cmd->len); w1_send_read_reply(sl, msg, hdr, cmd); break; case W1_CMD_WRITE: w1_write_block(sl->master, cmd->data, cmd->len); break; case W1_CMD_SEARCH: case W1_CMD_ALARM_SEARCH: w1_search_process(sl->master, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH); break; default: err = -1; break; } return err; } static void w1_cn_callback(void *data) { struct cn_msg *msg = data; 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; 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 (!mlen) goto out_cont; 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; } if (!dev) { err = -ENODEV; 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) w1_process_command_slave(sl, msg, m, cmd); else w1_process_command_master(dev, msg, m, cmd); 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: 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; } #if 0 if (err) { printk("%s: malformed message. Dropping.\n", __func__); } #endif } 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 w1_init_netlink(void) { return 0; } void w1_fini_netlink(void) { } #endif