Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/iucv/af_iucv.c |
| 3 | * |
| 4 | * IUCV protocol stack for Linux on zSeries |
| 5 | * |
| 6 | * Copyright 2006 IBM Corporation |
| 7 | * |
| 8 | * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> |
| 9 | */ |
| 10 | |
Ursula Braun | 8f7c502 | 2008-12-25 13:39:47 +0100 | [diff] [blame] | 11 | #define KMSG_COMPONENT "af_iucv" |
| 12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 13 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/poll.h> |
| 24 | #include <net/sock.h> |
| 25 | #include <asm/ebcdic.h> |
| 26 | #include <asm/cpcmd.h> |
| 27 | #include <linux/kmod.h> |
| 28 | |
| 29 | #include <net/iucv/iucv.h> |
| 30 | #include <net/iucv/af_iucv.h> |
| 31 | |
| 32 | #define CONFIG_IUCV_SOCK_DEBUG 1 |
| 33 | |
| 34 | #define IPRMDATA 0x80 |
| 35 | #define VERSION "1.0" |
| 36 | |
| 37 | static char iucv_userid[80]; |
| 38 | |
| 39 | static struct proto_ops iucv_sock_ops; |
| 40 | |
| 41 | static struct proto iucv_proto = { |
| 42 | .name = "AF_IUCV", |
| 43 | .owner = THIS_MODULE, |
| 44 | .obj_size = sizeof(struct iucv_sock), |
| 45 | }; |
| 46 | |
Heiko Carstens | 57f2044 | 2007-10-08 02:02:52 -0700 | [diff] [blame] | 47 | static void iucv_sock_kill(struct sock *sk); |
| 48 | static void iucv_sock_close(struct sock *sk); |
| 49 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 50 | /* Call Back functions */ |
| 51 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); |
| 52 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); |
| 53 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 54 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
| 55 | u8 ipuser[16]); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 56 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
Hendrik Brueckner | af88b52 | 2009-04-21 23:26:21 +0000 | [diff] [blame^] | 57 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 58 | |
| 59 | static struct iucv_sock_list iucv_sk_list = { |
Robert P. J. Day | 3db8ce3 | 2008-04-10 02:11:24 -0700 | [diff] [blame] | 60 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 61 | .autobind_name = ATOMIC_INIT(0) |
| 62 | }; |
| 63 | |
| 64 | static struct iucv_handler af_iucv_handler = { |
| 65 | .path_pending = iucv_callback_connreq, |
| 66 | .path_complete = iucv_callback_connack, |
| 67 | .path_severed = iucv_callback_connrej, |
| 68 | .message_pending = iucv_callback_rx, |
Hendrik Brueckner | af88b52 | 2009-04-21 23:26:21 +0000 | [diff] [blame^] | 69 | .message_complete = iucv_callback_txdone, |
| 70 | .path_quiesced = iucv_callback_shutdown, |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 71 | }; |
| 72 | |
| 73 | static inline void high_nmcpy(unsigned char *dst, char *src) |
| 74 | { |
| 75 | memcpy(dst, src, 8); |
| 76 | } |
| 77 | |
| 78 | static inline void low_nmcpy(unsigned char *dst, char *src) |
| 79 | { |
| 80 | memcpy(&dst[8], src, 8); |
| 81 | } |
| 82 | |
| 83 | /* Timers */ |
| 84 | static void iucv_sock_timeout(unsigned long arg) |
| 85 | { |
| 86 | struct sock *sk = (struct sock *)arg; |
| 87 | |
| 88 | bh_lock_sock(sk); |
| 89 | sk->sk_err = ETIMEDOUT; |
| 90 | sk->sk_state_change(sk); |
| 91 | bh_unlock_sock(sk); |
| 92 | |
| 93 | iucv_sock_kill(sk); |
| 94 | sock_put(sk); |
| 95 | } |
| 96 | |
| 97 | static void iucv_sock_clear_timer(struct sock *sk) |
| 98 | { |
| 99 | sk_stop_timer(sk, &sk->sk_timer); |
| 100 | } |
| 101 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 102 | static struct sock *__iucv_get_sock_by_name(char *nm) |
| 103 | { |
| 104 | struct sock *sk; |
| 105 | struct hlist_node *node; |
| 106 | |
| 107 | sk_for_each(sk, node, &iucv_sk_list.head) |
| 108 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) |
| 109 | return sk; |
| 110 | |
| 111 | return NULL; |
| 112 | } |
| 113 | |
| 114 | static void iucv_sock_destruct(struct sock *sk) |
| 115 | { |
| 116 | skb_queue_purge(&sk->sk_receive_queue); |
| 117 | skb_queue_purge(&sk->sk_write_queue); |
| 118 | } |
| 119 | |
| 120 | /* Cleanup Listen */ |
| 121 | static void iucv_sock_cleanup_listen(struct sock *parent) |
| 122 | { |
| 123 | struct sock *sk; |
| 124 | |
| 125 | /* Close non-accepted connections */ |
| 126 | while ((sk = iucv_accept_dequeue(parent, NULL))) { |
| 127 | iucv_sock_close(sk); |
| 128 | iucv_sock_kill(sk); |
| 129 | } |
| 130 | |
| 131 | parent->sk_state = IUCV_CLOSED; |
| 132 | sock_set_flag(parent, SOCK_ZAPPED); |
| 133 | } |
| 134 | |
| 135 | /* Kill socket */ |
| 136 | static void iucv_sock_kill(struct sock *sk) |
| 137 | { |
| 138 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) |
| 139 | return; |
| 140 | |
| 141 | iucv_sock_unlink(&iucv_sk_list, sk); |
| 142 | sock_set_flag(sk, SOCK_DEAD); |
| 143 | sock_put(sk); |
| 144 | } |
| 145 | |
| 146 | /* Close an IUCV socket */ |
| 147 | static void iucv_sock_close(struct sock *sk) |
| 148 | { |
| 149 | unsigned char user_data[16]; |
| 150 | struct iucv_sock *iucv = iucv_sk(sk); |
| 151 | int err; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 152 | unsigned long timeo; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 153 | |
| 154 | iucv_sock_clear_timer(sk); |
| 155 | lock_sock(sk); |
| 156 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 157 | switch (sk->sk_state) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 158 | case IUCV_LISTEN: |
| 159 | iucv_sock_cleanup_listen(sk); |
| 160 | break; |
| 161 | |
| 162 | case IUCV_CONNECTED: |
| 163 | case IUCV_DISCONN: |
| 164 | err = 0; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 165 | |
| 166 | sk->sk_state = IUCV_CLOSING; |
| 167 | sk->sk_state_change(sk); |
| 168 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 169 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 170 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
| 171 | timeo = sk->sk_lingertime; |
| 172 | else |
| 173 | timeo = IUCV_DISCONN_TIMEOUT; |
| 174 | err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo); |
| 175 | } |
| 176 | |
| 177 | sk->sk_state = IUCV_CLOSED; |
| 178 | sk->sk_state_change(sk); |
| 179 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 180 | if (iucv->path) { |
| 181 | low_nmcpy(user_data, iucv->src_name); |
| 182 | high_nmcpy(user_data, iucv->dst_name); |
| 183 | ASCEBC(user_data, sizeof(user_data)); |
| 184 | err = iucv_path_sever(iucv->path, user_data); |
| 185 | iucv_path_free(iucv->path); |
| 186 | iucv->path = NULL; |
| 187 | } |
| 188 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 189 | sk->sk_err = ECONNRESET; |
| 190 | sk->sk_state_change(sk); |
| 191 | |
| 192 | skb_queue_purge(&iucv->send_skb_q); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 193 | skb_queue_purge(&iucv->backlog_skb_q); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 194 | |
| 195 | sock_set_flag(sk, SOCK_ZAPPED); |
| 196 | break; |
| 197 | |
| 198 | default: |
| 199 | sock_set_flag(sk, SOCK_ZAPPED); |
| 200 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 201 | } |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 202 | |
| 203 | release_sock(sk); |
| 204 | iucv_sock_kill(sk); |
| 205 | } |
| 206 | |
| 207 | static void iucv_sock_init(struct sock *sk, struct sock *parent) |
| 208 | { |
| 209 | if (parent) |
| 210 | sk->sk_type = parent->sk_type; |
| 211 | } |
| 212 | |
| 213 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) |
| 214 | { |
| 215 | struct sock *sk; |
| 216 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 217 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 218 | if (!sk) |
| 219 | return NULL; |
| 220 | |
| 221 | sock_init_data(sock, sk); |
| 222 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 223 | spin_lock_init(&iucv_sk(sk)->accept_q_lock); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 224 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 225 | INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); |
| 226 | spin_lock_init(&iucv_sk(sk)->message_q.lock); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 227 | skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 228 | iucv_sk(sk)->send_tag = 0; |
| 229 | |
| 230 | sk->sk_destruct = iucv_sock_destruct; |
| 231 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; |
| 232 | sk->sk_allocation = GFP_DMA; |
| 233 | |
| 234 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 235 | |
| 236 | sk->sk_protocol = proto; |
| 237 | sk->sk_state = IUCV_OPEN; |
| 238 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 239 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 240 | |
| 241 | iucv_sock_link(&iucv_sk_list, sk); |
| 242 | return sk; |
| 243 | } |
| 244 | |
| 245 | /* Create an IUCV socket */ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 246 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol) |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 247 | { |
| 248 | struct sock *sk; |
| 249 | |
| 250 | if (sock->type != SOCK_STREAM) |
| 251 | return -ESOCKTNOSUPPORT; |
| 252 | |
| 253 | sock->state = SS_UNCONNECTED; |
| 254 | sock->ops = &iucv_sock_ops; |
| 255 | |
| 256 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); |
| 257 | if (!sk) |
| 258 | return -ENOMEM; |
| 259 | |
| 260 | iucv_sock_init(sk, NULL); |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) |
| 266 | { |
| 267 | write_lock_bh(&l->lock); |
| 268 | sk_add_node(sk, &l->head); |
| 269 | write_unlock_bh(&l->lock); |
| 270 | } |
| 271 | |
| 272 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) |
| 273 | { |
| 274 | write_lock_bh(&l->lock); |
| 275 | sk_del_node_init(sk); |
| 276 | write_unlock_bh(&l->lock); |
| 277 | } |
| 278 | |
| 279 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) |
| 280 | { |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 281 | unsigned long flags; |
| 282 | struct iucv_sock *par = iucv_sk(parent); |
| 283 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 284 | sock_hold(sk); |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 285 | spin_lock_irqsave(&par->accept_q_lock, flags); |
| 286 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); |
| 287 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 288 | iucv_sk(sk)->parent = parent; |
| 289 | parent->sk_ack_backlog++; |
| 290 | } |
| 291 | |
| 292 | void iucv_accept_unlink(struct sock *sk) |
| 293 | { |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 294 | unsigned long flags; |
| 295 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); |
| 296 | |
| 297 | spin_lock_irqsave(&par->accept_q_lock, flags); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 298 | list_del_init(&iucv_sk(sk)->accept_q); |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 299 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 300 | iucv_sk(sk)->parent->sk_ack_backlog--; |
| 301 | iucv_sk(sk)->parent = NULL; |
| 302 | sock_put(sk); |
| 303 | } |
| 304 | |
| 305 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) |
| 306 | { |
| 307 | struct iucv_sock *isk, *n; |
| 308 | struct sock *sk; |
| 309 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 310 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 311 | sk = (struct sock *) isk; |
| 312 | lock_sock(sk); |
| 313 | |
| 314 | if (sk->sk_state == IUCV_CLOSED) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 315 | iucv_accept_unlink(sk); |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 316 | release_sock(sk); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 317 | continue; |
| 318 | } |
| 319 | |
| 320 | if (sk->sk_state == IUCV_CONNECTED || |
| 321 | sk->sk_state == IUCV_SEVERED || |
| 322 | !newsock) { |
| 323 | iucv_accept_unlink(sk); |
| 324 | if (newsock) |
| 325 | sock_graft(sk, newsock); |
| 326 | |
| 327 | if (sk->sk_state == IUCV_SEVERED) |
| 328 | sk->sk_state = IUCV_DISCONN; |
| 329 | |
| 330 | release_sock(sk); |
| 331 | return sk; |
| 332 | } |
| 333 | |
| 334 | release_sock(sk); |
| 335 | } |
| 336 | return NULL; |
| 337 | } |
| 338 | |
| 339 | int iucv_sock_wait_state(struct sock *sk, int state, int state2, |
| 340 | unsigned long timeo) |
| 341 | { |
| 342 | DECLARE_WAITQUEUE(wait, current); |
| 343 | int err = 0; |
| 344 | |
| 345 | add_wait_queue(sk->sk_sleep, &wait); |
| 346 | while (sk->sk_state != state && sk->sk_state != state2) { |
| 347 | set_current_state(TASK_INTERRUPTIBLE); |
| 348 | |
| 349 | if (!timeo) { |
| 350 | err = -EAGAIN; |
| 351 | break; |
| 352 | } |
| 353 | |
| 354 | if (signal_pending(current)) { |
| 355 | err = sock_intr_errno(timeo); |
| 356 | break; |
| 357 | } |
| 358 | |
| 359 | release_sock(sk); |
| 360 | timeo = schedule_timeout(timeo); |
| 361 | lock_sock(sk); |
| 362 | |
| 363 | err = sock_error(sk); |
| 364 | if (err) |
| 365 | break; |
| 366 | } |
| 367 | set_current_state(TASK_RUNNING); |
| 368 | remove_wait_queue(sk->sk_sleep, &wait); |
| 369 | return err; |
| 370 | } |
| 371 | |
| 372 | /* Bind an unbound socket */ |
| 373 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, |
| 374 | int addr_len) |
| 375 | { |
| 376 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; |
| 377 | struct sock *sk = sock->sk; |
| 378 | struct iucv_sock *iucv; |
| 379 | int err; |
| 380 | |
| 381 | /* Verify the input sockaddr */ |
| 382 | if (!addr || addr->sa_family != AF_IUCV) |
| 383 | return -EINVAL; |
| 384 | |
| 385 | lock_sock(sk); |
| 386 | if (sk->sk_state != IUCV_OPEN) { |
| 387 | err = -EBADFD; |
| 388 | goto done; |
| 389 | } |
| 390 | |
| 391 | write_lock_bh(&iucv_sk_list.lock); |
| 392 | |
| 393 | iucv = iucv_sk(sk); |
| 394 | if (__iucv_get_sock_by_name(sa->siucv_name)) { |
| 395 | err = -EADDRINUSE; |
| 396 | goto done_unlock; |
| 397 | } |
| 398 | if (iucv->path) { |
| 399 | err = 0; |
| 400 | goto done_unlock; |
| 401 | } |
| 402 | |
| 403 | /* Bind the socket */ |
| 404 | memcpy(iucv->src_name, sa->siucv_name, 8); |
| 405 | |
| 406 | /* Copy the user id */ |
| 407 | memcpy(iucv->src_user_id, iucv_userid, 8); |
| 408 | sk->sk_state = IUCV_BOUND; |
| 409 | err = 0; |
| 410 | |
| 411 | done_unlock: |
| 412 | /* Release the socket list lock */ |
| 413 | write_unlock_bh(&iucv_sk_list.lock); |
| 414 | done: |
| 415 | release_sock(sk); |
| 416 | return err; |
| 417 | } |
| 418 | |
| 419 | /* Automatically bind an unbound socket */ |
| 420 | static int iucv_sock_autobind(struct sock *sk) |
| 421 | { |
| 422 | struct iucv_sock *iucv = iucv_sk(sk); |
| 423 | char query_buffer[80]; |
| 424 | char name[12]; |
| 425 | int err = 0; |
| 426 | |
| 427 | /* Set the userid and name */ |
| 428 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); |
| 429 | if (unlikely(err)) |
| 430 | return -EPROTO; |
| 431 | |
| 432 | memcpy(iucv->src_user_id, query_buffer, 8); |
| 433 | |
| 434 | write_lock_bh(&iucv_sk_list.lock); |
| 435 | |
| 436 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); |
| 437 | while (__iucv_get_sock_by_name(name)) { |
| 438 | sprintf(name, "%08x", |
| 439 | atomic_inc_return(&iucv_sk_list.autobind_name)); |
| 440 | } |
| 441 | |
| 442 | write_unlock_bh(&iucv_sk_list.lock); |
| 443 | |
| 444 | memcpy(&iucv->src_name, name, 8); |
| 445 | |
| 446 | return err; |
| 447 | } |
| 448 | |
| 449 | /* Connect an unconnected socket */ |
| 450 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, |
| 451 | int alen, int flags) |
| 452 | { |
| 453 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; |
| 454 | struct sock *sk = sock->sk; |
| 455 | struct iucv_sock *iucv; |
| 456 | unsigned char user_data[16]; |
| 457 | int err; |
| 458 | |
| 459 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) |
| 460 | return -EINVAL; |
| 461 | |
| 462 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) |
| 463 | return -EBADFD; |
| 464 | |
| 465 | if (sk->sk_type != SOCK_STREAM) |
| 466 | return -EINVAL; |
| 467 | |
| 468 | iucv = iucv_sk(sk); |
| 469 | |
| 470 | if (sk->sk_state == IUCV_OPEN) { |
| 471 | err = iucv_sock_autobind(sk); |
| 472 | if (unlikely(err)) |
| 473 | return err; |
| 474 | } |
| 475 | |
| 476 | lock_sock(sk); |
| 477 | |
| 478 | /* Set the destination information */ |
| 479 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); |
| 480 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); |
| 481 | |
| 482 | high_nmcpy(user_data, sa->siucv_name); |
| 483 | low_nmcpy(user_data, iucv_sk(sk)->src_name); |
| 484 | ASCEBC(user_data, sizeof(user_data)); |
| 485 | |
| 486 | iucv = iucv_sk(sk); |
| 487 | /* Create path. */ |
| 488 | iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT, |
| 489 | IPRMDATA, GFP_KERNEL); |
Ursula Braun | d444472 | 2008-02-07 18:07:19 -0800 | [diff] [blame] | 490 | if (!iucv->path) { |
| 491 | err = -ENOMEM; |
| 492 | goto done; |
| 493 | } |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 494 | err = iucv_path_connect(iucv->path, &af_iucv_handler, |
| 495 | sa->siucv_user_id, NULL, user_data, sk); |
| 496 | if (err) { |
| 497 | iucv_path_free(iucv->path); |
| 498 | iucv->path = NULL; |
Hendrik Brueckner | 55cdea9 | 2009-01-05 18:07:07 -0800 | [diff] [blame] | 499 | switch (err) { |
| 500 | case 0x0b: /* Target communicator is not logged on */ |
| 501 | err = -ENETUNREACH; |
| 502 | break; |
| 503 | case 0x0d: /* Max connections for this guest exceeded */ |
| 504 | case 0x0e: /* Max connections for target guest exceeded */ |
| 505 | err = -EAGAIN; |
| 506 | break; |
| 507 | case 0x0f: /* Missing IUCV authorization */ |
| 508 | err = -EACCES; |
| 509 | break; |
| 510 | default: |
| 511 | err = -ECONNREFUSED; |
| 512 | break; |
| 513 | } |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 514 | goto done; |
| 515 | } |
| 516 | |
| 517 | if (sk->sk_state != IUCV_CONNECTED) { |
| 518 | err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN, |
| 519 | sock_sndtimeo(sk, flags & O_NONBLOCK)); |
| 520 | } |
| 521 | |
| 522 | if (sk->sk_state == IUCV_DISCONN) { |
| 523 | release_sock(sk); |
| 524 | return -ECONNREFUSED; |
| 525 | } |
Ursula Braun | 18becbc | 2009-01-05 18:07:46 -0800 | [diff] [blame] | 526 | |
| 527 | if (err) { |
| 528 | iucv_path_sever(iucv->path, NULL); |
| 529 | iucv_path_free(iucv->path); |
| 530 | iucv->path = NULL; |
| 531 | } |
| 532 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 533 | done: |
| 534 | release_sock(sk); |
| 535 | return err; |
| 536 | } |
| 537 | |
| 538 | /* Move a socket into listening state. */ |
| 539 | static int iucv_sock_listen(struct socket *sock, int backlog) |
| 540 | { |
| 541 | struct sock *sk = sock->sk; |
| 542 | int err; |
| 543 | |
| 544 | lock_sock(sk); |
| 545 | |
| 546 | err = -EINVAL; |
| 547 | if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM) |
| 548 | goto done; |
| 549 | |
| 550 | sk->sk_max_ack_backlog = backlog; |
| 551 | sk->sk_ack_backlog = 0; |
| 552 | sk->sk_state = IUCV_LISTEN; |
| 553 | err = 0; |
| 554 | |
| 555 | done: |
| 556 | release_sock(sk); |
| 557 | return err; |
| 558 | } |
| 559 | |
| 560 | /* Accept a pending connection */ |
| 561 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, |
| 562 | int flags) |
| 563 | { |
| 564 | DECLARE_WAITQUEUE(wait, current); |
| 565 | struct sock *sk = sock->sk, *nsk; |
| 566 | long timeo; |
| 567 | int err = 0; |
| 568 | |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 569 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 570 | |
| 571 | if (sk->sk_state != IUCV_LISTEN) { |
| 572 | err = -EBADFD; |
| 573 | goto done; |
| 574 | } |
| 575 | |
| 576 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
| 577 | |
| 578 | /* Wait for an incoming connection */ |
| 579 | add_wait_queue_exclusive(sk->sk_sleep, &wait); |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 580 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 581 | set_current_state(TASK_INTERRUPTIBLE); |
| 582 | if (!timeo) { |
| 583 | err = -EAGAIN; |
| 584 | break; |
| 585 | } |
| 586 | |
| 587 | release_sock(sk); |
| 588 | timeo = schedule_timeout(timeo); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 589 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 590 | |
| 591 | if (sk->sk_state != IUCV_LISTEN) { |
| 592 | err = -EBADFD; |
| 593 | break; |
| 594 | } |
| 595 | |
| 596 | if (signal_pending(current)) { |
| 597 | err = sock_intr_errno(timeo); |
| 598 | break; |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | set_current_state(TASK_RUNNING); |
| 603 | remove_wait_queue(sk->sk_sleep, &wait); |
| 604 | |
| 605 | if (err) |
| 606 | goto done; |
| 607 | |
| 608 | newsock->state = SS_CONNECTED; |
| 609 | |
| 610 | done: |
| 611 | release_sock(sk); |
| 612 | return err; |
| 613 | } |
| 614 | |
| 615 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, |
| 616 | int *len, int peer) |
| 617 | { |
| 618 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; |
| 619 | struct sock *sk = sock->sk; |
| 620 | |
| 621 | addr->sa_family = AF_IUCV; |
| 622 | *len = sizeof(struct sockaddr_iucv); |
| 623 | |
| 624 | if (peer) { |
| 625 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); |
| 626 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); |
| 627 | } else { |
| 628 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); |
| 629 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); |
| 630 | } |
| 631 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); |
| 632 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); |
| 633 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
| 634 | |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 639 | struct msghdr *msg, size_t len) |
| 640 | { |
| 641 | struct sock *sk = sock->sk; |
| 642 | struct iucv_sock *iucv = iucv_sk(sk); |
| 643 | struct sk_buff *skb; |
| 644 | struct iucv_message txmsg; |
Ursula Braun | 8f7c502 | 2008-12-25 13:39:47 +0100 | [diff] [blame] | 645 | char user_id[9]; |
| 646 | char appl_id[9]; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 647 | int err; |
| 648 | |
| 649 | err = sock_error(sk); |
| 650 | if (err) |
| 651 | return err; |
| 652 | |
| 653 | if (msg->msg_flags & MSG_OOB) |
| 654 | return -EOPNOTSUPP; |
| 655 | |
| 656 | lock_sock(sk); |
| 657 | |
| 658 | if (sk->sk_shutdown & SEND_SHUTDOWN) { |
| 659 | err = -EPIPE; |
| 660 | goto out; |
| 661 | } |
| 662 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 663 | if (sk->sk_state == IUCV_CONNECTED) { |
| 664 | if (!(skb = sock_alloc_send_skb(sk, len, |
| 665 | msg->msg_flags & MSG_DONTWAIT, |
| 666 | &err))) |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 667 | goto out; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 668 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 669 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 670 | err = -EFAULT; |
| 671 | goto fail; |
| 672 | } |
| 673 | |
| 674 | txmsg.class = 0; |
Ursula Braun | 469689a4d | 2008-06-09 15:51:03 -0700 | [diff] [blame] | 675 | memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 676 | txmsg.tag = iucv->send_tag++; |
| 677 | memcpy(skb->cb, &txmsg.tag, 4); |
| 678 | skb_queue_tail(&iucv->send_skb_q, skb); |
| 679 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, |
| 680 | (void *) skb->data, skb->len); |
| 681 | if (err) { |
Ursula Braun | 8f7c502 | 2008-12-25 13:39:47 +0100 | [diff] [blame] | 682 | if (err == 3) { |
| 683 | user_id[8] = 0; |
| 684 | memcpy(user_id, iucv->dst_user_id, 8); |
| 685 | appl_id[8] = 0; |
| 686 | memcpy(appl_id, iucv->dst_name, 8); |
| 687 | pr_err("Application %s on z/VM guest %s" |
| 688 | " exceeds message limit\n", |
| 689 | user_id, appl_id); |
| 690 | } |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 691 | skb_unlink(skb, &iucv->send_skb_q); |
| 692 | err = -EPIPE; |
| 693 | goto fail; |
| 694 | } |
| 695 | |
| 696 | } else { |
| 697 | err = -ENOTCONN; |
| 698 | goto out; |
| 699 | } |
| 700 | |
| 701 | release_sock(sk); |
| 702 | return len; |
| 703 | |
| 704 | fail: |
| 705 | kfree_skb(skb); |
| 706 | out: |
| 707 | release_sock(sk); |
| 708 | return err; |
| 709 | } |
| 710 | |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 711 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
| 712 | { |
| 713 | int dataleft, size, copied = 0; |
| 714 | struct sk_buff *nskb; |
| 715 | |
| 716 | dataleft = len; |
| 717 | while (dataleft) { |
| 718 | if (dataleft >= sk->sk_rcvbuf / 4) |
| 719 | size = sk->sk_rcvbuf / 4; |
| 720 | else |
| 721 | size = dataleft; |
| 722 | |
| 723 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); |
| 724 | if (!nskb) |
| 725 | return -ENOMEM; |
| 726 | |
| 727 | memcpy(nskb->data, skb->data + copied, size); |
| 728 | copied += size; |
| 729 | dataleft -= size; |
| 730 | |
| 731 | skb_reset_transport_header(nskb); |
| 732 | skb_reset_network_header(nskb); |
| 733 | nskb->len = size; |
| 734 | |
| 735 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); |
| 736 | } |
| 737 | |
| 738 | return 0; |
| 739 | } |
| 740 | |
| 741 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
| 742 | struct iucv_path *path, |
| 743 | struct iucv_message *msg) |
| 744 | { |
| 745 | int rc; |
| 746 | |
| 747 | if (msg->flags & IPRMDATA) { |
| 748 | skb->data = NULL; |
| 749 | skb->len = 0; |
| 750 | } else { |
| 751 | rc = iucv_message_receive(path, msg, 0, skb->data, |
| 752 | msg->length, NULL); |
| 753 | if (rc) { |
| 754 | kfree_skb(skb); |
| 755 | return; |
| 756 | } |
| 757 | if (skb->truesize >= sk->sk_rcvbuf / 4) { |
| 758 | rc = iucv_fragment_skb(sk, skb, msg->length); |
| 759 | kfree_skb(skb); |
| 760 | skb = NULL; |
| 761 | if (rc) { |
| 762 | iucv_path_sever(path, NULL); |
| 763 | return; |
| 764 | } |
| 765 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); |
| 766 | } else { |
| 767 | skb_reset_transport_header(skb); |
| 768 | skb_reset_network_header(skb); |
| 769 | skb->len = msg->length; |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | if (sock_queue_rcv_skb(sk, skb)) |
| 774 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); |
| 775 | } |
| 776 | |
| 777 | static void iucv_process_message_q(struct sock *sk) |
| 778 | { |
| 779 | struct iucv_sock *iucv = iucv_sk(sk); |
| 780 | struct sk_buff *skb; |
| 781 | struct sock_msg_q *p, *n; |
| 782 | |
| 783 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { |
| 784 | skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA); |
| 785 | if (!skb) |
| 786 | break; |
| 787 | iucv_process_message(sk, skb, p->path, &p->msg); |
| 788 | list_del(&p->list); |
| 789 | kfree(p); |
| 790 | if (!skb_queue_empty(&iucv->backlog_skb_q)) |
| 791 | break; |
| 792 | } |
| 793 | } |
| 794 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 795 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 796 | struct msghdr *msg, size_t len, int flags) |
| 797 | { |
| 798 | int noblock = flags & MSG_DONTWAIT; |
| 799 | struct sock *sk = sock->sk; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 800 | struct iucv_sock *iucv = iucv_sk(sk); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 801 | int target, copied = 0; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 802 | struct sk_buff *skb, *rskb, *cskb; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 803 | int err = 0; |
| 804 | |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 805 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 806 | skb_queue_empty(&iucv->backlog_skb_q) && |
| 807 | skb_queue_empty(&sk->sk_receive_queue) && |
| 808 | list_empty(&iucv->message_q.list)) |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 809 | return 0; |
| 810 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 811 | if (flags & (MSG_OOB)) |
| 812 | return -EOPNOTSUPP; |
| 813 | |
| 814 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| 815 | |
| 816 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 817 | if (!skb) { |
| 818 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 819 | return 0; |
| 820 | return err; |
| 821 | } |
| 822 | |
| 823 | copied = min_t(unsigned int, skb->len, len); |
| 824 | |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 825 | cskb = skb; |
| 826 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 827 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 828 | if (copied == 0) |
| 829 | return -EFAULT; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 830 | goto done; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | len -= copied; |
| 834 | |
| 835 | /* Mark read part of skb as used */ |
| 836 | if (!(flags & MSG_PEEK)) { |
| 837 | skb_pull(skb, copied); |
| 838 | |
| 839 | if (skb->len) { |
| 840 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 841 | goto done; |
| 842 | } |
| 843 | |
| 844 | kfree_skb(skb); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 845 | |
| 846 | /* Queue backlog skbs */ |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 847 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 848 | while (rskb) { |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 849 | if (sock_queue_rcv_skb(sk, rskb)) { |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 850 | skb_queue_head(&iucv->backlog_skb_q, |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 851 | rskb); |
| 852 | break; |
| 853 | } else { |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 854 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 855 | } |
| 856 | } |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 857 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
| 858 | spin_lock_bh(&iucv->message_q.lock); |
| 859 | if (!list_empty(&iucv->message_q.list)) |
| 860 | iucv_process_message_q(sk); |
| 861 | spin_unlock_bh(&iucv->message_q.lock); |
| 862 | } |
| 863 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 864 | } else |
| 865 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 866 | |
| 867 | done: |
| 868 | return err ? : copied; |
| 869 | } |
| 870 | |
| 871 | static inline unsigned int iucv_accept_poll(struct sock *parent) |
| 872 | { |
| 873 | struct iucv_sock *isk, *n; |
| 874 | struct sock *sk; |
| 875 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 876 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 877 | sk = (struct sock *) isk; |
| 878 | |
| 879 | if (sk->sk_state == IUCV_CONNECTED) |
| 880 | return POLLIN | POLLRDNORM; |
| 881 | } |
| 882 | |
| 883 | return 0; |
| 884 | } |
| 885 | |
| 886 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, |
| 887 | poll_table *wait) |
| 888 | { |
| 889 | struct sock *sk = sock->sk; |
| 890 | unsigned int mask = 0; |
| 891 | |
| 892 | poll_wait(file, sk->sk_sleep, wait); |
| 893 | |
| 894 | if (sk->sk_state == IUCV_LISTEN) |
| 895 | return iucv_accept_poll(sk); |
| 896 | |
| 897 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
| 898 | mask |= POLLERR; |
| 899 | |
| 900 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 901 | mask |= POLLRDHUP; |
| 902 | |
| 903 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
| 904 | mask |= POLLHUP; |
| 905 | |
| 906 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 907 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 908 | mask |= POLLIN | POLLRDNORM; |
| 909 | |
| 910 | if (sk->sk_state == IUCV_CLOSED) |
| 911 | mask |= POLLHUP; |
| 912 | |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 913 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
| 914 | mask |= POLLIN; |
| 915 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 916 | if (sock_writeable(sk)) |
| 917 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 918 | else |
| 919 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 920 | |
| 921 | return mask; |
| 922 | } |
| 923 | |
| 924 | static int iucv_sock_shutdown(struct socket *sock, int how) |
| 925 | { |
| 926 | struct sock *sk = sock->sk; |
| 927 | struct iucv_sock *iucv = iucv_sk(sk); |
| 928 | struct iucv_message txmsg; |
| 929 | int err = 0; |
| 930 | u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; |
| 931 | |
| 932 | how++; |
| 933 | |
| 934 | if ((how & ~SHUTDOWN_MASK) || !how) |
| 935 | return -EINVAL; |
| 936 | |
| 937 | lock_sock(sk); |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 938 | switch (sk->sk_state) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 939 | case IUCV_CLOSED: |
| 940 | err = -ENOTCONN; |
| 941 | goto fail; |
| 942 | |
| 943 | default: |
| 944 | sk->sk_shutdown |= how; |
| 945 | break; |
| 946 | } |
| 947 | |
| 948 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { |
| 949 | txmsg.class = 0; |
| 950 | txmsg.tag = 0; |
| 951 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, |
| 952 | (void *) prmmsg, 8); |
| 953 | if (err) { |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 954 | switch (err) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 955 | case 1: |
| 956 | err = -ENOTCONN; |
| 957 | break; |
| 958 | case 2: |
| 959 | err = -ECONNRESET; |
| 960 | break; |
| 961 | default: |
| 962 | err = -ENOTCONN; |
| 963 | break; |
| 964 | } |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
| 969 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); |
| 970 | if (err) |
| 971 | err = -ENOTCONN; |
| 972 | |
| 973 | skb_queue_purge(&sk->sk_receive_queue); |
| 974 | } |
| 975 | |
| 976 | /* Wake up anyone sleeping in poll */ |
| 977 | sk->sk_state_change(sk); |
| 978 | |
| 979 | fail: |
| 980 | release_sock(sk); |
| 981 | return err; |
| 982 | } |
| 983 | |
| 984 | static int iucv_sock_release(struct socket *sock) |
| 985 | { |
| 986 | struct sock *sk = sock->sk; |
| 987 | int err = 0; |
| 988 | |
| 989 | if (!sk) |
| 990 | return 0; |
| 991 | |
| 992 | iucv_sock_close(sk); |
| 993 | |
| 994 | /* Unregister with IUCV base support */ |
| 995 | if (iucv_sk(sk)->path) { |
| 996 | iucv_path_sever(iucv_sk(sk)->path, NULL); |
| 997 | iucv_path_free(iucv_sk(sk)->path); |
| 998 | iucv_sk(sk)->path = NULL; |
| 999 | } |
| 1000 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1001 | sock_orphan(sk); |
| 1002 | iucv_sock_kill(sk); |
| 1003 | return err; |
| 1004 | } |
| 1005 | |
| 1006 | /* Callback wrappers - called from iucv base support */ |
| 1007 | static int iucv_callback_connreq(struct iucv_path *path, |
| 1008 | u8 ipvmid[8], u8 ipuser[16]) |
| 1009 | { |
| 1010 | unsigned char user_data[16]; |
| 1011 | unsigned char nuser_data[16]; |
| 1012 | unsigned char src_name[8]; |
| 1013 | struct hlist_node *node; |
| 1014 | struct sock *sk, *nsk; |
| 1015 | struct iucv_sock *iucv, *niucv; |
| 1016 | int err; |
| 1017 | |
| 1018 | memcpy(src_name, ipuser, 8); |
| 1019 | EBCASC(src_name, 8); |
| 1020 | /* Find out if this path belongs to af_iucv. */ |
| 1021 | read_lock(&iucv_sk_list.lock); |
| 1022 | iucv = NULL; |
Ursula Braun | febca28 | 2007-07-14 19:04:25 -0700 | [diff] [blame] | 1023 | sk = NULL; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1024 | sk_for_each(sk, node, &iucv_sk_list.head) |
| 1025 | if (sk->sk_state == IUCV_LISTEN && |
| 1026 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { |
| 1027 | /* |
| 1028 | * Found a listening socket with |
| 1029 | * src_name == ipuser[0-7]. |
| 1030 | */ |
| 1031 | iucv = iucv_sk(sk); |
| 1032 | break; |
| 1033 | } |
| 1034 | read_unlock(&iucv_sk_list.lock); |
| 1035 | if (!iucv) |
| 1036 | /* No socket found, not one of our paths. */ |
| 1037 | return -EINVAL; |
| 1038 | |
| 1039 | bh_lock_sock(sk); |
| 1040 | |
| 1041 | /* Check if parent socket is listening */ |
| 1042 | low_nmcpy(user_data, iucv->src_name); |
| 1043 | high_nmcpy(user_data, iucv->dst_name); |
| 1044 | ASCEBC(user_data, sizeof(user_data)); |
| 1045 | if (sk->sk_state != IUCV_LISTEN) { |
| 1046 | err = iucv_path_sever(path, user_data); |
Hendrik Brueckner | 65dbd7c | 2009-01-05 18:08:23 -0800 | [diff] [blame] | 1047 | iucv_path_free(path); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1048 | goto fail; |
| 1049 | } |
| 1050 | |
| 1051 | /* Check for backlog size */ |
| 1052 | if (sk_acceptq_is_full(sk)) { |
| 1053 | err = iucv_path_sever(path, user_data); |
Hendrik Brueckner | 65dbd7c | 2009-01-05 18:08:23 -0800 | [diff] [blame] | 1054 | iucv_path_free(path); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1055 | goto fail; |
| 1056 | } |
| 1057 | |
| 1058 | /* Create the new socket */ |
| 1059 | nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC); |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1060 | if (!nsk) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1061 | err = iucv_path_sever(path, user_data); |
Hendrik Brueckner | 65dbd7c | 2009-01-05 18:08:23 -0800 | [diff] [blame] | 1062 | iucv_path_free(path); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1063 | goto fail; |
| 1064 | } |
| 1065 | |
| 1066 | niucv = iucv_sk(nsk); |
| 1067 | iucv_sock_init(nsk, sk); |
| 1068 | |
| 1069 | /* Set the new iucv_sock */ |
| 1070 | memcpy(niucv->dst_name, ipuser + 8, 8); |
| 1071 | EBCASC(niucv->dst_name, 8); |
| 1072 | memcpy(niucv->dst_user_id, ipvmid, 8); |
| 1073 | memcpy(niucv->src_name, iucv->src_name, 8); |
| 1074 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); |
| 1075 | niucv->path = path; |
| 1076 | |
| 1077 | /* Call iucv_accept */ |
| 1078 | high_nmcpy(nuser_data, ipuser + 8); |
| 1079 | memcpy(nuser_data + 8, niucv->src_name, 8); |
| 1080 | ASCEBC(nuser_data + 8, 8); |
| 1081 | |
| 1082 | path->msglim = IUCV_QUEUELEN_DEFAULT; |
| 1083 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1084 | if (err) { |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1085 | err = iucv_path_sever(path, user_data); |
Hendrik Brueckner | 65dbd7c | 2009-01-05 18:08:23 -0800 | [diff] [blame] | 1086 | iucv_path_free(path); |
| 1087 | iucv_sock_kill(nsk); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1088 | goto fail; |
| 1089 | } |
| 1090 | |
| 1091 | iucv_accept_enqueue(sk, nsk); |
| 1092 | |
| 1093 | /* Wake up accept */ |
| 1094 | nsk->sk_state = IUCV_CONNECTED; |
| 1095 | sk->sk_data_ready(sk, 1); |
| 1096 | err = 0; |
| 1097 | fail: |
| 1098 | bh_unlock_sock(sk); |
| 1099 | return 0; |
| 1100 | } |
| 1101 | |
| 1102 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) |
| 1103 | { |
| 1104 | struct sock *sk = path->private; |
| 1105 | |
| 1106 | sk->sk_state = IUCV_CONNECTED; |
| 1107 | sk->sk_state_change(sk); |
| 1108 | } |
| 1109 | |
| 1110 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) |
| 1111 | { |
| 1112 | struct sock *sk = path->private; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1113 | struct iucv_sock *iucv = iucv_sk(sk); |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1114 | struct sk_buff *skb; |
| 1115 | struct sock_msg_q *save_msg; |
| 1116 | int len; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1117 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1118 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 1119 | return; |
| 1120 | |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1121 | if (!list_empty(&iucv->message_q.list) || |
| 1122 | !skb_queue_empty(&iucv->backlog_skb_q)) |
| 1123 | goto save_message; |
| 1124 | |
| 1125 | len = atomic_read(&sk->sk_rmem_alloc); |
| 1126 | len += msg->length + sizeof(struct sk_buff); |
| 1127 | if (len > sk->sk_rcvbuf) |
| 1128 | goto save_message; |
| 1129 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1130 | skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA); |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1131 | if (!skb) |
| 1132 | goto save_message; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1133 | |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1134 | spin_lock(&iucv->message_q.lock); |
| 1135 | iucv_process_message(sk, skb, path, msg); |
| 1136 | spin_unlock(&iucv->message_q.lock); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1137 | |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1138 | return; |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1139 | |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1140 | save_message: |
| 1141 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); |
Ursula Braun | d444472 | 2008-02-07 18:07:19 -0800 | [diff] [blame] | 1142 | if (!save_msg) |
| 1143 | return; |
Ursula Braun | f0703c8 | 2007-10-08 02:03:31 -0700 | [diff] [blame] | 1144 | save_msg->path = path; |
| 1145 | save_msg->msg = *msg; |
| 1146 | |
| 1147 | spin_lock(&iucv->message_q.lock); |
| 1148 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
| 1149 | spin_unlock(&iucv->message_q.lock); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1150 | } |
| 1151 | |
| 1152 | static void iucv_callback_txdone(struct iucv_path *path, |
| 1153 | struct iucv_message *msg) |
| 1154 | { |
| 1155 | struct sock *sk = path->private; |
Ursula Braun | f2a7799 | 2008-02-07 18:07:44 -0800 | [diff] [blame] | 1156 | struct sk_buff *this = NULL; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1157 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
| 1158 | struct sk_buff *list_skb = list->next; |
| 1159 | unsigned long flags; |
| 1160 | |
Ursula Braun | f2a7799 | 2008-02-07 18:07:44 -0800 | [diff] [blame] | 1161 | if (!skb_queue_empty(list)) { |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1162 | spin_lock_irqsave(&list->lock, flags); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1163 | |
Ursula Braun | f2a7799 | 2008-02-07 18:07:44 -0800 | [diff] [blame] | 1164 | while (list_skb != (struct sk_buff *)list) { |
| 1165 | if (!memcmp(&msg->tag, list_skb->cb, 4)) { |
| 1166 | this = list_skb; |
| 1167 | break; |
| 1168 | } |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1169 | list_skb = list_skb->next; |
Ursula Braun | f2a7799 | 2008-02-07 18:07:44 -0800 | [diff] [blame] | 1170 | } |
| 1171 | if (this) |
| 1172 | __skb_unlink(this, list); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1173 | |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1174 | spin_unlock_irqrestore(&list->lock, flags); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1175 | |
Wei Yongjun | 47a30b2 | 2009-02-25 00:41:03 +0000 | [diff] [blame] | 1176 | kfree_skb(this); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1177 | } |
Ursula Braun | c2b4afd | 2008-07-14 09:59:29 +0200 | [diff] [blame] | 1178 | BUG_ON(!this); |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1179 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1180 | if (sk->sk_state == IUCV_CLOSING) { |
Jennifer Hunt | 561e036 | 2007-05-04 12:22:07 -0700 | [diff] [blame] | 1181 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
| 1182 | sk->sk_state = IUCV_CLOSED; |
| 1183 | sk->sk_state_change(sk); |
| 1184 | } |
| 1185 | } |
| 1186 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1187 | } |
| 1188 | |
| 1189 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) |
| 1190 | { |
| 1191 | struct sock *sk = path->private; |
| 1192 | |
| 1193 | if (!list_empty(&iucv_sk(sk)->accept_q)) |
| 1194 | sk->sk_state = IUCV_SEVERED; |
| 1195 | else |
| 1196 | sk->sk_state = IUCV_DISCONN; |
| 1197 | |
| 1198 | sk->sk_state_change(sk); |
| 1199 | } |
| 1200 | |
Hendrik Brueckner | af88b52 | 2009-04-21 23:26:21 +0000 | [diff] [blame^] | 1201 | /* called if the other communication side shuts down its RECV direction; |
| 1202 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. |
| 1203 | */ |
| 1204 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) |
| 1205 | { |
| 1206 | struct sock *sk = path->private; |
| 1207 | |
| 1208 | bh_lock_sock(sk); |
| 1209 | if (sk->sk_state != IUCV_CLOSED) { |
| 1210 | sk->sk_shutdown |= SEND_SHUTDOWN; |
| 1211 | sk->sk_state_change(sk); |
| 1212 | } |
| 1213 | bh_unlock_sock(sk); |
| 1214 | } |
| 1215 | |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1216 | static struct proto_ops iucv_sock_ops = { |
| 1217 | .family = PF_IUCV, |
| 1218 | .owner = THIS_MODULE, |
| 1219 | .release = iucv_sock_release, |
| 1220 | .bind = iucv_sock_bind, |
| 1221 | .connect = iucv_sock_connect, |
| 1222 | .listen = iucv_sock_listen, |
| 1223 | .accept = iucv_sock_accept, |
| 1224 | .getname = iucv_sock_getname, |
| 1225 | .sendmsg = iucv_sock_sendmsg, |
| 1226 | .recvmsg = iucv_sock_recvmsg, |
| 1227 | .poll = iucv_sock_poll, |
| 1228 | .ioctl = sock_no_ioctl, |
| 1229 | .mmap = sock_no_mmap, |
| 1230 | .socketpair = sock_no_socketpair, |
| 1231 | .shutdown = iucv_sock_shutdown, |
| 1232 | .setsockopt = sock_no_setsockopt, |
| 1233 | .getsockopt = sock_no_getsockopt |
| 1234 | }; |
| 1235 | |
| 1236 | static struct net_proto_family iucv_sock_family_ops = { |
| 1237 | .family = AF_IUCV, |
| 1238 | .owner = THIS_MODULE, |
| 1239 | .create = iucv_sock_create, |
| 1240 | }; |
| 1241 | |
Heiko Carstens | da99f05 | 2007-05-04 12:23:27 -0700 | [diff] [blame] | 1242 | static int __init afiucv_init(void) |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1243 | { |
| 1244 | int err; |
| 1245 | |
| 1246 | if (!MACHINE_IS_VM) { |
Ursula Braun | 8f7c502 | 2008-12-25 13:39:47 +0100 | [diff] [blame] | 1247 | pr_err("The af_iucv module cannot be loaded" |
| 1248 | " without z/VM\n"); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1249 | err = -EPROTONOSUPPORT; |
| 1250 | goto out; |
| 1251 | } |
| 1252 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); |
| 1253 | if (unlikely(err)) { |
Ursula Braun | c2b4afd | 2008-07-14 09:59:29 +0200 | [diff] [blame] | 1254 | WARN_ON(err); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1255 | err = -EPROTONOSUPPORT; |
| 1256 | goto out; |
| 1257 | } |
| 1258 | |
| 1259 | err = iucv_register(&af_iucv_handler, 0); |
| 1260 | if (err) |
| 1261 | goto out; |
| 1262 | err = proto_register(&iucv_proto, 0); |
| 1263 | if (err) |
| 1264 | goto out_iucv; |
| 1265 | err = sock_register(&iucv_sock_family_ops); |
| 1266 | if (err) |
| 1267 | goto out_proto; |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1268 | return 0; |
| 1269 | |
| 1270 | out_proto: |
| 1271 | proto_unregister(&iucv_proto); |
| 1272 | out_iucv: |
| 1273 | iucv_unregister(&af_iucv_handler, 0); |
| 1274 | out: |
| 1275 | return err; |
| 1276 | } |
| 1277 | |
| 1278 | static void __exit afiucv_exit(void) |
| 1279 | { |
| 1280 | sock_unregister(PF_IUCV); |
| 1281 | proto_unregister(&iucv_proto); |
| 1282 | iucv_unregister(&af_iucv_handler, 0); |
Jennifer Hunt | eac3731 | 2007-02-08 13:51:54 -0800 | [diff] [blame] | 1283 | } |
| 1284 | |
| 1285 | module_init(afiucv_init); |
| 1286 | module_exit(afiucv_exit); |
| 1287 | |
| 1288 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); |
| 1289 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); |
| 1290 | MODULE_VERSION(VERSION); |
| 1291 | MODULE_LICENSE("GPL"); |
| 1292 | MODULE_ALIAS_NETPROTO(PF_IUCV); |