Sven Eckelmann | 0046b04 | 2016-01-01 00:01:03 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 2 | * |
| 3 | * Marek Lindner |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public |
| 7 | * License as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
Antonio Quartulli | ebf38fb | 2013-11-03 20:40:48 +0100 | [diff] [blame] | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 18 | #include "icmp_socket.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 19 | #include "main.h" |
| 20 | |
| 21 | #include <linux/atomic.h> |
| 22 | #include <linux/compiler.h> |
| 23 | #include <linux/debugfs.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/etherdevice.h> |
| 26 | #include <linux/export.h> |
| 27 | #include <linux/fcntl.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/if_ether.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/list.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/netdevice.h> |
| 34 | #include <linux/pkt_sched.h> |
| 35 | #include <linux/poll.h> |
| 36 | #include <linux/printk.h> |
| 37 | #include <linux/sched.h> /* for linux/wait.h */ |
| 38 | #include <linux/skbuff.h> |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/spinlock.h> |
| 41 | #include <linux/stat.h> |
| 42 | #include <linux/stddef.h> |
| 43 | #include <linux/string.h> |
| 44 | #include <linux/uaccess.h> |
| 45 | #include <linux/wait.h> |
| 46 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 47 | #include "hard-interface.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 48 | #include "originator.h" |
| 49 | #include "packet.h" |
| 50 | #include "send.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 51 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 52 | static struct batadv_socket_client *batadv_socket_client_hash[256]; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 53 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 54 | static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 55 | struct batadv_icmp_header *icmph, |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 56 | size_t icmp_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 57 | |
Sven Eckelmann | 9039dc7 | 2012-05-12 02:09:33 +0200 | [diff] [blame] | 58 | void batadv_socket_init(void) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 59 | { |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 60 | memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash)); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 61 | } |
| 62 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 63 | static int batadv_socket_open(struct inode *inode, struct file *file) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 64 | { |
| 65 | unsigned int i; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 66 | struct batadv_socket_client *socket_client; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 67 | |
Sven Eckelmann | bd5b80d | 2012-08-20 23:37:26 +0200 | [diff] [blame] | 68 | if (!try_module_get(THIS_MODULE)) |
| 69 | return -EBUSY; |
| 70 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 71 | nonseekable_open(inode, file); |
| 72 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 73 | socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL); |
Sven Eckelmann | bd5b80d | 2012-08-20 23:37:26 +0200 | [diff] [blame] | 74 | if (!socket_client) { |
| 75 | module_put(THIS_MODULE); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 76 | return -ENOMEM; |
Sven Eckelmann | bd5b80d | 2012-08-20 23:37:26 +0200 | [diff] [blame] | 77 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 78 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 79 | for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) { |
| 80 | if (!batadv_socket_client_hash[i]) { |
| 81 | batadv_socket_client_hash[i] = socket_client; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 82 | break; |
| 83 | } |
| 84 | } |
| 85 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 86 | if (i == ARRAY_SIZE(batadv_socket_client_hash)) { |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 87 | pr_err("Error - can't add another packet client: maximum number of clients reached\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 88 | kfree(socket_client); |
Sven Eckelmann | bd5b80d | 2012-08-20 23:37:26 +0200 | [diff] [blame] | 89 | module_put(THIS_MODULE); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 90 | return -EXFULL; |
| 91 | } |
| 92 | |
| 93 | INIT_LIST_HEAD(&socket_client->queue_list); |
| 94 | socket_client->queue_len = 0; |
| 95 | socket_client->index = i; |
| 96 | socket_client->bat_priv = inode->i_private; |
| 97 | spin_lock_init(&socket_client->lock); |
| 98 | init_waitqueue_head(&socket_client->queue_wait); |
| 99 | |
| 100 | file->private_data = socket_client; |
| 101 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 102 | return 0; |
| 103 | } |
| 104 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 105 | static int batadv_socket_release(struct inode *inode, struct file *file) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 106 | { |
Geliang Tang | fb1f23e | 2015-12-18 23:33:31 +0800 | [diff] [blame] | 107 | struct batadv_socket_client *client = file->private_data; |
| 108 | struct batadv_socket_packet *packet, *tmp; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 109 | |
Geliang Tang | fb1f23e | 2015-12-18 23:33:31 +0800 | [diff] [blame] | 110 | spin_lock_bh(&client->lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 111 | |
| 112 | /* for all packets in the queue ... */ |
Geliang Tang | fb1f23e | 2015-12-18 23:33:31 +0800 | [diff] [blame] | 113 | list_for_each_entry_safe(packet, tmp, &client->queue_list, list) { |
| 114 | list_del(&packet->list); |
| 115 | kfree(packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 116 | } |
| 117 | |
Geliang Tang | fb1f23e | 2015-12-18 23:33:31 +0800 | [diff] [blame] | 118 | batadv_socket_client_hash[client->index] = NULL; |
| 119 | spin_unlock_bh(&client->lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 120 | |
Geliang Tang | fb1f23e | 2015-12-18 23:33:31 +0800 | [diff] [blame] | 121 | kfree(client); |
Sven Eckelmann | bd5b80d | 2012-08-20 23:37:26 +0200 | [diff] [blame] | 122 | module_put(THIS_MODULE); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 127 | static ssize_t batadv_socket_read(struct file *file, char __user *buf, |
| 128 | size_t count, loff_t *ppos) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 129 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 130 | struct batadv_socket_client *socket_client = file->private_data; |
| 131 | struct batadv_socket_packet *socket_packet; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 132 | size_t packet_len; |
| 133 | int error; |
| 134 | |
| 135 | if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0)) |
| 136 | return -EAGAIN; |
| 137 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 138 | if ((!buf) || (count < sizeof(struct batadv_icmp_packet))) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 139 | return -EINVAL; |
| 140 | |
| 141 | if (!access_ok(VERIFY_WRITE, buf, count)) |
| 142 | return -EFAULT; |
| 143 | |
| 144 | error = wait_event_interruptible(socket_client->queue_wait, |
| 145 | socket_client->queue_len); |
| 146 | |
| 147 | if (error) |
| 148 | return error; |
| 149 | |
| 150 | spin_lock_bh(&socket_client->lock); |
| 151 | |
| 152 | socket_packet = list_first_entry(&socket_client->queue_list, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 153 | struct batadv_socket_packet, list); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 154 | list_del(&socket_packet->list); |
| 155 | socket_client->queue_len--; |
| 156 | |
| 157 | spin_unlock_bh(&socket_client->lock); |
| 158 | |
Sven Eckelmann | b5a1eee | 2011-12-10 15:28:36 +0100 | [diff] [blame] | 159 | packet_len = min(count, socket_packet->icmp_len); |
| 160 | error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 161 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 162 | kfree(socket_packet); |
| 163 | |
| 164 | if (error) |
| 165 | return -EFAULT; |
| 166 | |
| 167 | return packet_len; |
| 168 | } |
| 169 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 170 | static ssize_t batadv_socket_write(struct file *file, const char __user *buff, |
| 171 | size_t len, loff_t *off) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 172 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 173 | struct batadv_socket_client *socket_client = file->private_data; |
| 174 | struct batadv_priv *bat_priv = socket_client->bat_priv; |
| 175 | struct batadv_hard_iface *primary_if = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 176 | struct sk_buff *skb; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 177 | struct batadv_icmp_packet_rr *icmp_packet_rr; |
| 178 | struct batadv_icmp_header *icmp_header; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 179 | struct batadv_orig_node *orig_node = NULL; |
| 180 | struct batadv_neigh_node *neigh_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 181 | size_t packet_len = sizeof(struct batadv_icmp_packet); |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 182 | u8 *addr; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 183 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 184 | if (len < sizeof(struct batadv_icmp_header)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 185 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 186 | "Error - can't send packet from char device: invalid packet size\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 187 | return -EINVAL; |
| 188 | } |
| 189 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 190 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 191 | |
| 192 | if (!primary_if) { |
| 193 | len = -EFAULT; |
| 194 | goto out; |
| 195 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 196 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 197 | if (len >= BATADV_ICMP_MAX_PACKET_SIZE) |
| 198 | packet_len = BATADV_ICMP_MAX_PACKET_SIZE; |
| 199 | else |
| 200 | packet_len = len; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 201 | |
Antonio Quartulli | 41ab6c4 | 2013-04-02 22:28:44 +0200 | [diff] [blame] | 202 | skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 203 | if (!skb) { |
| 204 | len = -ENOMEM; |
| 205 | goto out; |
| 206 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 207 | |
Simon Wunderlich | c54f38c | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 208 | skb->priority = TC_PRIO_CONTROL; |
Antonio Quartulli | 41ab6c4 | 2013-04-02 22:28:44 +0200 | [diff] [blame] | 209 | skb_reserve(skb, ETH_HLEN); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 210 | icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 211 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 212 | if (copy_from_user(icmp_header, buff, packet_len)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 213 | len = -EFAULT; |
| 214 | goto free_skb; |
| 215 | } |
| 216 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 217 | if (icmp_header->packet_type != BATADV_ICMP) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 218 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 219 | "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 220 | len = -EINVAL; |
| 221 | goto free_skb; |
| 222 | } |
| 223 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 224 | switch (icmp_header->msg_type) { |
| 225 | case BATADV_ECHO_REQUEST: |
| 226 | if (len < sizeof(struct batadv_icmp_packet)) { |
| 227 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 228 | "Error - can't send packet from char device: invalid packet size\n"); |
| 229 | len = -EINVAL; |
| 230 | goto free_skb; |
| 231 | } |
| 232 | |
| 233 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
| 234 | goto dst_unreach; |
| 235 | |
| 236 | orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst); |
| 237 | if (!orig_node) |
| 238 | goto dst_unreach; |
| 239 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 240 | neigh_node = batadv_orig_router_get(orig_node, |
| 241 | BATADV_IF_DEFAULT); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 242 | if (!neigh_node) |
| 243 | goto dst_unreach; |
| 244 | |
| 245 | if (!neigh_node->if_incoming) |
| 246 | goto dst_unreach; |
| 247 | |
| 248 | if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE) |
| 249 | goto dst_unreach; |
| 250 | |
| 251 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header; |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 252 | if (packet_len == sizeof(*icmp_packet_rr)) { |
| 253 | addr = neigh_node->if_incoming->net_dev->dev_addr; |
| 254 | ether_addr_copy(icmp_packet_rr->rr[0], addr); |
| 255 | } |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 256 | |
| 257 | break; |
| 258 | default: |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 259 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 260 | "Error - can't send packet from char device: got unknown message type\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 261 | len = -EINVAL; |
| 262 | goto free_skb; |
| 263 | } |
| 264 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 265 | icmp_header->uid = socket_client->index; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 266 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 267 | if (icmp_header->version != BATADV_COMPAT_VERSION) { |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 268 | icmp_header->msg_type = BATADV_PARAMETER_PROBLEM; |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 269 | icmp_header->version = BATADV_COMPAT_VERSION; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 270 | batadv_socket_add_packet(socket_client, icmp_header, |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 271 | packet_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 272 | goto free_skb; |
| 273 | } |
| 274 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 275 | ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 276 | |
Antonio Quartulli | 95d3927 | 2016-01-16 16:40:15 +0800 | [diff] [blame] | 277 | batadv_send_unicast_skb(skb, neigh_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 278 | goto out; |
| 279 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 280 | dst_unreach: |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 281 | icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE; |
| 282 | batadv_socket_add_packet(socket_client, icmp_header, packet_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 283 | free_skb: |
| 284 | kfree_skb(skb); |
| 285 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 286 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 287 | batadv_hardif_put(primary_if); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 288 | if (neigh_node) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 289 | batadv_neigh_node_put(neigh_node); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 290 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 291 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 292 | return len; |
| 293 | } |
| 294 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 295 | static unsigned int batadv_socket_poll(struct file *file, poll_table *wait) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 296 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 297 | struct batadv_socket_client *socket_client = file->private_data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 298 | |
| 299 | poll_wait(file, &socket_client->queue_wait, wait); |
| 300 | |
| 301 | if (socket_client->queue_len > 0) |
| 302 | return POLLIN | POLLRDNORM; |
| 303 | |
| 304 | return 0; |
| 305 | } |
| 306 | |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 307 | static const struct file_operations batadv_fops = { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 308 | .owner = THIS_MODULE, |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 309 | .open = batadv_socket_open, |
| 310 | .release = batadv_socket_release, |
| 311 | .read = batadv_socket_read, |
| 312 | .write = batadv_socket_write, |
| 313 | .poll = batadv_socket_poll, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 314 | .llseek = no_llseek, |
| 315 | }; |
| 316 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 317 | int batadv_socket_setup(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 318 | { |
| 319 | struct dentry *d; |
| 320 | |
| 321 | if (!bat_priv->debug_dir) |
| 322 | goto err; |
| 323 | |
Sven Eckelmann | 6434664 | 2012-06-03 22:19:12 +0200 | [diff] [blame] | 324 | d = debugfs_create_file(BATADV_ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR, |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 325 | bat_priv->debug_dir, bat_priv, &batadv_fops); |
Sven Eckelmann | 5346c35 | 2012-05-05 13:27:28 +0200 | [diff] [blame] | 326 | if (!d) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 327 | goto err; |
| 328 | |
| 329 | return 0; |
| 330 | |
| 331 | err: |
Sven Eckelmann | 5346c35 | 2012-05-05 13:27:28 +0200 | [diff] [blame] | 332 | return -ENOMEM; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 333 | } |
| 334 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 335 | /** |
Antonio Quartulli | 6d030de | 2016-03-11 16:36:19 +0100 | [diff] [blame^] | 336 | * batadv_socket_add_packet - schedule an icmp packet to be sent to |
Sven Eckelmann | 3447382 | 2015-05-31 10:10:20 +0200 | [diff] [blame] | 337 | * userspace on an icmp socket. |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 338 | * @socket_client: the socket this packet belongs to |
| 339 | * @icmph: pointer to the header of the icmp packet |
| 340 | * @icmp_len: total length of the icmp packet |
| 341 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 342 | static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 343 | struct batadv_icmp_header *icmph, |
Sven Eckelmann | af4447f | 2012-05-12 18:33:59 +0200 | [diff] [blame] | 344 | size_t icmp_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 345 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 346 | struct batadv_socket_packet *socket_packet; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 347 | size_t len; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 348 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 349 | socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 350 | |
| 351 | if (!socket_packet) |
| 352 | return; |
| 353 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 354 | len = icmp_len; |
| 355 | /* check the maximum length before filling the buffer */ |
| 356 | if (len > sizeof(socket_packet->icmp_packet)) |
| 357 | len = sizeof(socket_packet->icmp_packet); |
| 358 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 359 | INIT_LIST_HEAD(&socket_packet->list); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 360 | memcpy(&socket_packet->icmp_packet, icmph, len); |
| 361 | socket_packet->icmp_len = len; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 362 | |
| 363 | spin_lock_bh(&socket_client->lock); |
| 364 | |
| 365 | /* while waiting for the lock the socket_client could have been |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 366 | * deleted |
| 367 | */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 368 | if (!batadv_socket_client_hash[icmph->uid]) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 369 | spin_unlock_bh(&socket_client->lock); |
| 370 | kfree(socket_packet); |
| 371 | return; |
| 372 | } |
| 373 | |
| 374 | list_add_tail(&socket_packet->list, &socket_client->queue_list); |
| 375 | socket_client->queue_len++; |
| 376 | |
| 377 | if (socket_client->queue_len > 100) { |
| 378 | socket_packet = list_first_entry(&socket_client->queue_list, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 379 | struct batadv_socket_packet, |
| 380 | list); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 381 | |
| 382 | list_del(&socket_packet->list); |
| 383 | kfree(socket_packet); |
| 384 | socket_client->queue_len--; |
| 385 | } |
| 386 | |
| 387 | spin_unlock_bh(&socket_client->lock); |
| 388 | |
| 389 | wake_up(&socket_client->queue_wait); |
| 390 | } |
| 391 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 392 | /** |
| 393 | * batadv_socket_receive_packet - schedule an icmp packet to be received |
| 394 | * locally and sent to userspace. |
| 395 | * @icmph: pointer to the header of the icmp packet |
| 396 | * @icmp_len: total length of the icmp packet |
| 397 | */ |
| 398 | void batadv_socket_receive_packet(struct batadv_icmp_header *icmph, |
Sven Eckelmann | 9039dc7 | 2012-05-12 02:09:33 +0200 | [diff] [blame] | 399 | size_t icmp_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 400 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 401 | struct batadv_socket_client *hash; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 402 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 403 | hash = batadv_socket_client_hash[icmph->uid]; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 404 | if (hash) |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 405 | batadv_socket_add_packet(hash, icmph, icmp_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 406 | } |