/* * 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 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; *data = rn; cmd->len += 8; hdr->len += 8; msg->len += 8; return; } 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; 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; } 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) { 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); } static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd) { 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; } static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg, struct w1_netlink_cmd *rcmd, int error) { 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; } 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; 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 w1_init_netlink(void) { return 0; } void w1_fini_netlink(void) { } #endif