1/* 2 * w1_netlink.c 3 * 4 * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru> 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22#include <linux/skbuff.h> 23#include <linux/netlink.h> 24#include <linux/connector.h> 25 26#include "w1.h" 27#include "w1_log.h" 28#include "w1_netlink.h" 29 30#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || \ 31 (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE))) 32void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) 33{ 34 char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)]; 35 struct cn_msg *m = (struct cn_msg *)buf; 36 struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1); 37 38 memset(buf, 0, sizeof(buf)); 39 40 m->id.idx = CN_W1_IDX; 41 m->id.val = CN_W1_VAL; 42 43 m->seq = dev->seq++; 44 m->len = sizeof(struct w1_netlink_msg); 45 46 memcpy(w, msg, sizeof(struct w1_netlink_msg)); 47 48 cn_netlink_send(m, 0, GFP_KERNEL); 49} 50 51static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg, 52 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) 53{ 54 dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n", 55 __func__, dev->name, cmd->cmd, cmd->len); 56 57 if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH) 58 return -EINVAL; 59 60 w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH); 61 return 0; 62} 63 64static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg, 65 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) 66{ 67 void *data; 68 struct w1_netlink_msg *h; 69 struct w1_netlink_cmd *c; 70 struct cn_msg *cm; 71 int err; 72 73 data = kzalloc(sizeof(struct cn_msg) + 74 sizeof(struct w1_netlink_msg) + 75 sizeof(struct w1_netlink_cmd) + 76 cmd->len, GFP_KERNEL); 77 if (!data) 78 return -ENOMEM; 79 80 cm = (struct cn_msg *)(data); 81 h = (struct w1_netlink_msg *)(cm + 1); 82 c = (struct w1_netlink_cmd *)(h + 1); 83 84 memcpy(cm, msg, sizeof(struct cn_msg)); 85 memcpy(h, hdr, sizeof(struct w1_netlink_msg)); 86 memcpy(c, cmd, sizeof(struct w1_netlink_cmd)); 87 88 cm->ack = msg->seq+1; 89 cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len; 90 91 h->len = sizeof(struct w1_netlink_cmd) + cmd->len; 92 93 memcpy(c->data, cmd->data, c->len); 94 95 err = cn_netlink_send(cm, 0, GFP_KERNEL); 96 97 kfree(data); 98 99 return err; 100} 101 102static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg, 103 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) 104{ 105 int err = 0; 106 107 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n", 108 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc, 109 cmd->cmd, cmd->len); 110 111 switch (cmd->cmd) { 112 case W1_CMD_READ: 113 w1_read_block(sl->master, cmd->data, cmd->len); 114 w1_send_read_reply(sl, msg, hdr, cmd); 115 break; 116 case W1_CMD_WRITE: 117 w1_write_block(sl->master, cmd->data, cmd->len); 118 break; 119 case W1_CMD_SEARCH: 120 case W1_CMD_ALARM_SEARCH: 121 w1_search_process(sl->master, 122 (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH); 123 break; 124 default: 125 err = -1; 126 break; 127 } 128 129 return err; 130} 131 132static void w1_cn_callback(void *data) 133{ 134 struct cn_msg *msg = data; 135 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1); 136 struct w1_netlink_cmd *cmd; 137 struct w1_slave *sl; 138 struct w1_master *dev; 139 int err = 0; 140 141 while (msg->len && !err) { 142 struct w1_reg_num id; 143 u16 mlen = m->len; 144 u8 *cmd_data = m->data; 145 146 dev = NULL; 147 sl = NULL; 148 149 memcpy(&id, m->id.id, sizeof(id)); 150 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) { 151 err = -E2BIG; 152 break; 153 } 154 155 if (!mlen) 156 goto out_cont; 157 158 if (m->type == W1_MASTER_CMD) { 159 dev = w1_search_master_id(m->id.mst.id); 160 } else if (m->type == W1_SLAVE_CMD) { 161 sl = w1_search_slave(&id); 162 if (sl) 163 dev = sl->master; 164 } 165 166 if (!dev) { 167 err = -ENODEV; 168 goto out_cont; 169 } 170 171 mutex_lock(&dev->mutex); 172 173 if (sl && w1_reset_select_slave(sl)) { 174 err = -ENODEV; 175 goto out_up; 176 } 177 178 while (mlen) { 179 cmd = (struct w1_netlink_cmd *)cmd_data; 180 181 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) { 182 err = -E2BIG; 183 break; 184 } 185 186 if (sl) 187 w1_process_command_slave(sl, msg, m, cmd); 188 else 189 w1_process_command_master(dev, msg, m, cmd); 190 191 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd); 192 mlen -= cmd->len + sizeof(struct w1_netlink_cmd); 193 } 194out_up: 195 atomic_dec(&dev->refcnt); 196 if (sl) 197 atomic_dec(&sl->refcnt); 198 mutex_unlock(&dev->mutex); 199out_cont: 200 msg->len -= sizeof(struct w1_netlink_msg) + m->len; 201 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len); 202 203 /* 204 * Let's allow requests for nonexisting devices. 205 */ 206 if (err == -ENODEV) 207 err = 0; 208 } 209} 210 211int w1_init_netlink(void) 212{ 213 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL}; 214 215 return cn_add_callback(&w1_id, "w1", &w1_cn_callback); 216} 217 218void w1_fini_netlink(void) 219{ 220 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL}; 221 222 cn_del_callback(&w1_id); 223} 224#else 225void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) 226{ 227} 228 229int w1_init_netlink(void) 230{ 231 return 0; 232} 233 234void w1_fini_netlink(void) 235{ 236} 237#endif 238