1 /* 2 * Copyright (C) 2011 Instituto Nokia de Tecnologia 3 * 4 * Authors: 5 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> 6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the 20 * Free Software Foundation, Inc., 21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 25 26 #include <net/tcp_states.h> 27 #include <linux/nfc.h> 28 #include <linux/export.h> 29 30 #include "nfc.h" 31 32 static void rawsock_write_queue_purge(struct sock *sk) 33 { 34 pr_debug("sk=%p\n", sk); 35 36 spin_lock_bh(&sk->sk_write_queue.lock); 37 __skb_queue_purge(&sk->sk_write_queue); 38 nfc_rawsock(sk)->tx_work_scheduled = false; 39 spin_unlock_bh(&sk->sk_write_queue.lock); 40 } 41 42 static void rawsock_report_error(struct sock *sk, int err) 43 { 44 pr_debug("sk=%p err=%d\n", sk, err); 45 46 sk->sk_shutdown = SHUTDOWN_MASK; 47 sk->sk_err = -err; 48 sk->sk_error_report(sk); 49 50 rawsock_write_queue_purge(sk); 51 } 52 53 static int rawsock_release(struct socket *sock) 54 { 55 struct sock *sk = sock->sk; 56 57 pr_debug("sock=%p\n", sock); 58 59 sock_orphan(sk); 60 sock_put(sk); 61 62 return 0; 63 } 64 65 static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, 66 int len, int flags) 67 { 68 struct sock *sk = sock->sk; 69 struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; 70 struct nfc_dev *dev; 71 int rc = 0; 72 73 pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); 74 75 if (!addr || len < sizeof(struct sockaddr_nfc) || 76 addr->sa_family != AF_NFC) 77 return -EINVAL; 78 79 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", 80 addr->dev_idx, addr->target_idx, addr->nfc_protocol); 81 82 lock_sock(sk); 83 84 if (sock->state == SS_CONNECTED) { 85 rc = -EISCONN; 86 goto error; 87 } 88 89 dev = nfc_get_device(addr->dev_idx); 90 if (!dev) { 91 rc = -ENODEV; 92 goto error; 93 } 94 95 if (addr->target_idx > dev->target_next_idx - 1 || 96 addr->target_idx < dev->target_next_idx - dev->n_targets) { 97 rc = -EINVAL; 98 goto error; 99 } 100 101 rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); 102 if (rc) 103 goto put_dev; 104 105 nfc_rawsock(sk)->dev = dev; 106 nfc_rawsock(sk)->target_idx = addr->target_idx; 107 sock->state = SS_CONNECTED; 108 sk->sk_state = TCP_ESTABLISHED; 109 sk->sk_state_change(sk); 110 111 release_sock(sk); 112 return 0; 113 114 put_dev: 115 nfc_put_device(dev); 116 error: 117 release_sock(sk); 118 return rc; 119 } 120 121 static int rawsock_add_header(struct sk_buff *skb) 122 { 123 *skb_push(skb, NFC_HEADER_SIZE) = 0; 124 125 return 0; 126 } 127 128 static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, 129 int err) 130 { 131 struct sock *sk = (struct sock *) context; 132 133 BUG_ON(in_irq()); 134 135 pr_debug("sk=%p err=%d\n", sk, err); 136 137 if (err) 138 goto error; 139 140 err = rawsock_add_header(skb); 141 if (err) 142 goto error; 143 144 err = sock_queue_rcv_skb(sk, skb); 145 if (err) 146 goto error; 147 148 spin_lock_bh(&sk->sk_write_queue.lock); 149 if (!skb_queue_empty(&sk->sk_write_queue)) 150 schedule_work(&nfc_rawsock(sk)->tx_work); 151 else 152 nfc_rawsock(sk)->tx_work_scheduled = false; 153 spin_unlock_bh(&sk->sk_write_queue.lock); 154 155 sock_put(sk); 156 return; 157 158 error: 159 rawsock_report_error(sk, err); 160 sock_put(sk); 161 } 162 163 static void rawsock_tx_work(struct work_struct *work) 164 { 165 struct sock *sk = to_rawsock_sk(work); 166 struct nfc_dev *dev = nfc_rawsock(sk)->dev; 167 u32 target_idx = nfc_rawsock(sk)->target_idx; 168 struct sk_buff *skb; 169 int rc; 170 171 pr_debug("sk=%p target_idx=%u\n", sk, target_idx); 172 173 if (sk->sk_shutdown & SEND_SHUTDOWN) { 174 rawsock_write_queue_purge(sk); 175 return; 176 } 177 178 skb = skb_dequeue(&sk->sk_write_queue); 179 180 sock_hold(sk); 181 rc = nfc_data_exchange(dev, target_idx, skb, 182 rawsock_data_exchange_complete, sk); 183 if (rc) { 184 rawsock_report_error(sk, rc); 185 sock_put(sk); 186 } 187 } 188 189 static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, 190 struct msghdr *msg, size_t len) 191 { 192 struct sock *sk = sock->sk; 193 struct nfc_dev *dev = nfc_rawsock(sk)->dev; 194 struct sk_buff *skb; 195 int rc; 196 197 pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); 198 199 if (msg->msg_namelen) 200 return -EOPNOTSUPP; 201 202 if (sock->state != SS_CONNECTED) 203 return -ENOTCONN; 204 205 skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); 206 if (skb == NULL) 207 return rc; 208 209 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); 210 if (rc < 0) { 211 kfree_skb(skb); 212 return rc; 213 } 214 215 spin_lock_bh(&sk->sk_write_queue.lock); 216 __skb_queue_tail(&sk->sk_write_queue, skb); 217 if (!nfc_rawsock(sk)->tx_work_scheduled) { 218 schedule_work(&nfc_rawsock(sk)->tx_work); 219 nfc_rawsock(sk)->tx_work_scheduled = true; 220 } 221 spin_unlock_bh(&sk->sk_write_queue.lock); 222 223 return len; 224 } 225 226 static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock, 227 struct msghdr *msg, size_t len, int flags) 228 { 229 int noblock = flags & MSG_DONTWAIT; 230 struct sock *sk = sock->sk; 231 struct sk_buff *skb; 232 int copied; 233 int rc; 234 235 pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags); 236 237 skb = skb_recv_datagram(sk, flags, noblock, &rc); 238 if (!skb) 239 return rc; 240 241 msg->msg_namelen = 0; 242 243 copied = skb->len; 244 if (len < copied) { 245 msg->msg_flags |= MSG_TRUNC; 246 copied = len; 247 } 248 249 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 250 251 skb_free_datagram(sk, skb); 252 253 return rc ? : copied; 254 } 255 256 257 static const struct proto_ops rawsock_ops = { 258 .family = PF_NFC, 259 .owner = THIS_MODULE, 260 .release = rawsock_release, 261 .bind = sock_no_bind, 262 .connect = rawsock_connect, 263 .socketpair = sock_no_socketpair, 264 .accept = sock_no_accept, 265 .getname = sock_no_getname, 266 .poll = datagram_poll, 267 .ioctl = sock_no_ioctl, 268 .listen = sock_no_listen, 269 .shutdown = sock_no_shutdown, 270 .setsockopt = sock_no_setsockopt, 271 .getsockopt = sock_no_getsockopt, 272 .sendmsg = rawsock_sendmsg, 273 .recvmsg = rawsock_recvmsg, 274 .mmap = sock_no_mmap, 275 }; 276 277 static void rawsock_destruct(struct sock *sk) 278 { 279 pr_debug("sk=%p\n", sk); 280 281 if (sk->sk_state == TCP_ESTABLISHED) { 282 nfc_deactivate_target(nfc_rawsock(sk)->dev, 283 nfc_rawsock(sk)->target_idx); 284 nfc_put_device(nfc_rawsock(sk)->dev); 285 } 286 287 skb_queue_purge(&sk->sk_receive_queue); 288 289 if (!sock_flag(sk, SOCK_DEAD)) { 290 pr_err("Freeing alive NFC raw socket %p\n", sk); 291 return; 292 } 293 } 294 295 static int rawsock_create(struct net *net, struct socket *sock, 296 const struct nfc_protocol *nfc_proto) 297 { 298 struct sock *sk; 299 300 pr_debug("sock=%p\n", sock); 301 302 if (sock->type != SOCK_SEQPACKET) 303 return -ESOCKTNOSUPPORT; 304 305 sock->ops = &rawsock_ops; 306 307 sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto); 308 if (!sk) 309 return -ENOMEM; 310 311 sock_init_data(sock, sk); 312 sk->sk_protocol = nfc_proto->id; 313 sk->sk_destruct = rawsock_destruct; 314 sock->state = SS_UNCONNECTED; 315 316 INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); 317 nfc_rawsock(sk)->tx_work_scheduled = false; 318 319 return 0; 320 } 321 322 static struct proto rawsock_proto = { 323 .name = "NFC_RAW", 324 .owner = THIS_MODULE, 325 .obj_size = sizeof(struct nfc_rawsock), 326 }; 327 328 static const struct nfc_protocol rawsock_nfc_proto = { 329 .id = NFC_SOCKPROTO_RAW, 330 .proto = &rawsock_proto, 331 .owner = THIS_MODULE, 332 .create = rawsock_create 333 }; 334 335 int __init rawsock_init(void) 336 { 337 int rc; 338 339 rc = nfc_proto_register(&rawsock_nfc_proto); 340 341 return rc; 342 } 343 344 void rawsock_exit(void) 345 { 346 nfc_proto_unregister(&rawsock_nfc_proto); 347 } 348