| 1 | /* |
| 2 | * net/tipc/port.c: TIPC port code |
| 3 | * |
| 4 | * Copyright (c) 1992-2007, Ericsson AB |
| 5 | * Copyright (c) 2004-2008, 2010-2011, Wind River Systems |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the names of the copyright holders nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * Alternatively, this software may be distributed under the terms of the |
| 21 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 22 | * Software Foundation. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "core.h" |
| 38 | #include "config.h" |
| 39 | #include "port.h" |
| 40 | #include "name_table.h" |
| 41 | |
| 42 | /* Connection management: */ |
| 43 | #define PROBING_INTERVAL 3600000 /* [ms] => 1 h */ |
| 44 | #define CONFIRMED 0 |
| 45 | #define PROBING 1 |
| 46 | |
| 47 | #define MAX_REJECT_SIZE 1024 |
| 48 | |
| 49 | static struct sk_buff *msg_queue_head; |
| 50 | static struct sk_buff *msg_queue_tail; |
| 51 | |
| 52 | DEFINE_SPINLOCK(tipc_port_list_lock); |
| 53 | static DEFINE_SPINLOCK(queue_lock); |
| 54 | |
| 55 | static LIST_HEAD(ports); |
| 56 | static void port_handle_node_down(unsigned long ref); |
| 57 | static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err); |
| 58 | static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err); |
| 59 | static void port_timeout(unsigned long ref); |
| 60 | |
| 61 | |
| 62 | static u32 port_peernode(struct tipc_port *p_ptr) |
| 63 | { |
| 64 | return msg_destnode(&p_ptr->phdr); |
| 65 | } |
| 66 | |
| 67 | static u32 port_peerport(struct tipc_port *p_ptr) |
| 68 | { |
| 69 | return msg_destport(&p_ptr->phdr); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * tipc_port_peer_msg - verify message was sent by connected port's peer |
| 74 | * |
| 75 | * Handles cases where the node's network address has changed from |
| 76 | * the default of <0.0.0> to its configured setting. |
| 77 | */ |
| 78 | int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg) |
| 79 | { |
| 80 | u32 peernode; |
| 81 | u32 orignode; |
| 82 | |
| 83 | if (msg_origport(msg) != port_peerport(p_ptr)) |
| 84 | return 0; |
| 85 | |
| 86 | orignode = msg_orignode(msg); |
| 87 | peernode = port_peernode(p_ptr); |
| 88 | return (orignode == peernode) || |
| 89 | (!orignode && (peernode == tipc_own_addr)) || |
| 90 | (!peernode && (orignode == tipc_own_addr)); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * tipc_multicast - send a multicast message to local and remote destinations |
| 95 | */ |
| 96 | int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, |
| 97 | u32 num_sect, struct iovec const *msg_sect, |
| 98 | unsigned int total_len) |
| 99 | { |
| 100 | struct tipc_msg *hdr; |
| 101 | struct sk_buff *buf; |
| 102 | struct sk_buff *ibuf = NULL; |
| 103 | struct tipc_port_list dports = {0, NULL, }; |
| 104 | struct tipc_port *oport = tipc_port_deref(ref); |
| 105 | int ext_targets; |
| 106 | int res; |
| 107 | |
| 108 | if (unlikely(!oport)) |
| 109 | return -EINVAL; |
| 110 | |
| 111 | /* Create multicast message */ |
| 112 | hdr = &oport->phdr; |
| 113 | msg_set_type(hdr, TIPC_MCAST_MSG); |
| 114 | msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); |
| 115 | msg_set_destport(hdr, 0); |
| 116 | msg_set_destnode(hdr, 0); |
| 117 | msg_set_nametype(hdr, seq->type); |
| 118 | msg_set_namelower(hdr, seq->lower); |
| 119 | msg_set_nameupper(hdr, seq->upper); |
| 120 | msg_set_hdr_sz(hdr, MCAST_H_SIZE); |
| 121 | res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE, |
| 122 | !oport->user_port, &buf); |
| 123 | if (unlikely(!buf)) |
| 124 | return res; |
| 125 | |
| 126 | /* Figure out where to send multicast message */ |
| 127 | ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper, |
| 128 | TIPC_NODE_SCOPE, &dports); |
| 129 | |
| 130 | /* Send message to destinations (duplicate it only if necessary) */ |
| 131 | if (ext_targets) { |
| 132 | if (dports.count != 0) { |
| 133 | ibuf = skb_copy(buf, GFP_ATOMIC); |
| 134 | if (ibuf == NULL) { |
| 135 | tipc_port_list_free(&dports); |
| 136 | kfree_skb(buf); |
| 137 | return -ENOMEM; |
| 138 | } |
| 139 | } |
| 140 | res = tipc_bclink_send_msg(buf); |
| 141 | if ((res < 0) && (dports.count != 0)) |
| 142 | kfree_skb(ibuf); |
| 143 | } else { |
| 144 | ibuf = buf; |
| 145 | } |
| 146 | |
| 147 | if (res >= 0) { |
| 148 | if (ibuf) |
| 149 | tipc_port_recv_mcast(ibuf, &dports); |
| 150 | } else { |
| 151 | tipc_port_list_free(&dports); |
| 152 | } |
| 153 | return res; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * tipc_port_recv_mcast - deliver multicast message to all destination ports |
| 158 | * |
| 159 | * If there is no port list, perform a lookup to create one |
| 160 | */ |
| 161 | void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp) |
| 162 | { |
| 163 | struct tipc_msg *msg; |
| 164 | struct tipc_port_list dports = {0, NULL, }; |
| 165 | struct tipc_port_list *item = dp; |
| 166 | int cnt = 0; |
| 167 | |
| 168 | msg = buf_msg(buf); |
| 169 | |
| 170 | /* Create destination port list, if one wasn't supplied */ |
| 171 | if (dp == NULL) { |
| 172 | tipc_nametbl_mc_translate(msg_nametype(msg), |
| 173 | msg_namelower(msg), |
| 174 | msg_nameupper(msg), |
| 175 | TIPC_CLUSTER_SCOPE, |
| 176 | &dports); |
| 177 | item = dp = &dports; |
| 178 | } |
| 179 | |
| 180 | /* Deliver a copy of message to each destination port */ |
| 181 | if (dp->count != 0) { |
| 182 | msg_set_destnode(msg, tipc_own_addr); |
| 183 | if (dp->count == 1) { |
| 184 | msg_set_destport(msg, dp->ports[0]); |
| 185 | tipc_port_recv_msg(buf); |
| 186 | tipc_port_list_free(dp); |
| 187 | return; |
| 188 | } |
| 189 | for (; cnt < dp->count; cnt++) { |
| 190 | int index = cnt % PLSIZE; |
| 191 | struct sk_buff *b = skb_clone(buf, GFP_ATOMIC); |
| 192 | |
| 193 | if (b == NULL) { |
| 194 | pr_warn("Unable to deliver multicast message(s)\n"); |
| 195 | goto exit; |
| 196 | } |
| 197 | if ((index == 0) && (cnt != 0)) |
| 198 | item = item->next; |
| 199 | msg_set_destport(buf_msg(b), item->ports[index]); |
| 200 | tipc_port_recv_msg(b); |
| 201 | } |
| 202 | } |
| 203 | exit: |
| 204 | kfree_skb(buf); |
| 205 | tipc_port_list_free(dp); |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * tipc_createport_raw - create a generic TIPC port |
| 210 | * |
| 211 | * Returns pointer to (locked) TIPC port, or NULL if unable to create it |
| 212 | */ |
| 213 | struct tipc_port *tipc_createport_raw(void *usr_handle, |
| 214 | u32 (*dispatcher)(struct tipc_port *, struct sk_buff *), |
| 215 | void (*wakeup)(struct tipc_port *), |
| 216 | const u32 importance) |
| 217 | { |
| 218 | struct tipc_port *p_ptr; |
| 219 | struct tipc_msg *msg; |
| 220 | u32 ref; |
| 221 | |
| 222 | p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC); |
| 223 | if (!p_ptr) { |
| 224 | pr_warn("Port creation failed, no memory\n"); |
| 225 | return NULL; |
| 226 | } |
| 227 | ref = tipc_ref_acquire(p_ptr, &p_ptr->lock); |
| 228 | if (!ref) { |
| 229 | pr_warn("Port creation failed, ref. table exhausted\n"); |
| 230 | kfree(p_ptr); |
| 231 | return NULL; |
| 232 | } |
| 233 | |
| 234 | p_ptr->usr_handle = usr_handle; |
| 235 | p_ptr->max_pkt = MAX_PKT_DEFAULT; |
| 236 | p_ptr->ref = ref; |
| 237 | INIT_LIST_HEAD(&p_ptr->wait_list); |
| 238 | INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list); |
| 239 | p_ptr->dispatcher = dispatcher; |
| 240 | p_ptr->wakeup = wakeup; |
| 241 | p_ptr->user_port = NULL; |
| 242 | k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref); |
| 243 | INIT_LIST_HEAD(&p_ptr->publications); |
| 244 | INIT_LIST_HEAD(&p_ptr->port_list); |
| 245 | |
| 246 | /* |
| 247 | * Must hold port list lock while initializing message header template |
| 248 | * to ensure a change to node's own network address doesn't result |
| 249 | * in template containing out-dated network address information |
| 250 | */ |
| 251 | spin_lock_bh(&tipc_port_list_lock); |
| 252 | msg = &p_ptr->phdr; |
| 253 | tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0); |
| 254 | msg_set_origport(msg, ref); |
| 255 | list_add_tail(&p_ptr->port_list, &ports); |
| 256 | spin_unlock_bh(&tipc_port_list_lock); |
| 257 | return p_ptr; |
| 258 | } |
| 259 | |
| 260 | int tipc_deleteport(u32 ref) |
| 261 | { |
| 262 | struct tipc_port *p_ptr; |
| 263 | struct sk_buff *buf = NULL; |
| 264 | |
| 265 | tipc_withdraw(ref, 0, NULL); |
| 266 | p_ptr = tipc_port_lock(ref); |
| 267 | if (!p_ptr) |
| 268 | return -EINVAL; |
| 269 | |
| 270 | tipc_ref_discard(ref); |
| 271 | tipc_port_unlock(p_ptr); |
| 272 | |
| 273 | k_cancel_timer(&p_ptr->timer); |
| 274 | if (p_ptr->connected) { |
| 275 | buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT); |
| 276 | tipc_nodesub_unsubscribe(&p_ptr->subscription); |
| 277 | } |
| 278 | kfree(p_ptr->user_port); |
| 279 | |
| 280 | spin_lock_bh(&tipc_port_list_lock); |
| 281 | list_del(&p_ptr->port_list); |
| 282 | list_del(&p_ptr->wait_list); |
| 283 | spin_unlock_bh(&tipc_port_list_lock); |
| 284 | k_term_timer(&p_ptr->timer); |
| 285 | kfree(p_ptr); |
| 286 | tipc_net_route_msg(buf); |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static int port_unreliable(struct tipc_port *p_ptr) |
| 291 | { |
| 292 | return msg_src_droppable(&p_ptr->phdr); |
| 293 | } |
| 294 | |
| 295 | int tipc_portunreliable(u32 ref, unsigned int *isunreliable) |
| 296 | { |
| 297 | struct tipc_port *p_ptr; |
| 298 | |
| 299 | p_ptr = tipc_port_lock(ref); |
| 300 | if (!p_ptr) |
| 301 | return -EINVAL; |
| 302 | *isunreliable = port_unreliable(p_ptr); |
| 303 | tipc_port_unlock(p_ptr); |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | int tipc_set_portunreliable(u32 ref, unsigned int isunreliable) |
| 308 | { |
| 309 | struct tipc_port *p_ptr; |
| 310 | |
| 311 | p_ptr = tipc_port_lock(ref); |
| 312 | if (!p_ptr) |
| 313 | return -EINVAL; |
| 314 | msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0)); |
| 315 | tipc_port_unlock(p_ptr); |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | static int port_unreturnable(struct tipc_port *p_ptr) |
| 320 | { |
| 321 | return msg_dest_droppable(&p_ptr->phdr); |
| 322 | } |
| 323 | |
| 324 | int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable) |
| 325 | { |
| 326 | struct tipc_port *p_ptr; |
| 327 | |
| 328 | p_ptr = tipc_port_lock(ref); |
| 329 | if (!p_ptr) |
| 330 | return -EINVAL; |
| 331 | *isunrejectable = port_unreturnable(p_ptr); |
| 332 | tipc_port_unlock(p_ptr); |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable) |
| 337 | { |
| 338 | struct tipc_port *p_ptr; |
| 339 | |
| 340 | p_ptr = tipc_port_lock(ref); |
| 341 | if (!p_ptr) |
| 342 | return -EINVAL; |
| 343 | msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0)); |
| 344 | tipc_port_unlock(p_ptr); |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * port_build_proto_msg(): create connection protocol message for port |
| 350 | * |
| 351 | * On entry the port must be locked and connected. |
| 352 | */ |
| 353 | static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr, |
| 354 | u32 type, u32 ack) |
| 355 | { |
| 356 | struct sk_buff *buf; |
| 357 | struct tipc_msg *msg; |
| 358 | |
| 359 | buf = tipc_buf_acquire(INT_H_SIZE); |
| 360 | if (buf) { |
| 361 | msg = buf_msg(buf); |
| 362 | tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE, |
| 363 | port_peernode(p_ptr)); |
| 364 | msg_set_destport(msg, port_peerport(p_ptr)); |
| 365 | msg_set_origport(msg, p_ptr->ref); |
| 366 | msg_set_msgcnt(msg, ack); |
| 367 | } |
| 368 | return buf; |
| 369 | } |
| 370 | |
| 371 | int tipc_reject_msg(struct sk_buff *buf, u32 err) |
| 372 | { |
| 373 | struct tipc_msg *msg = buf_msg(buf); |
| 374 | struct sk_buff *rbuf; |
| 375 | struct tipc_msg *rmsg; |
| 376 | int hdr_sz; |
| 377 | u32 imp; |
| 378 | u32 data_sz = msg_data_sz(msg); |
| 379 | u32 src_node; |
| 380 | u32 rmsg_sz; |
| 381 | |
| 382 | /* discard rejected message if it shouldn't be returned to sender */ |
| 383 | if (WARN(!msg_isdata(msg), |
| 384 | "attempt to reject message with user=%u", msg_user(msg))) { |
| 385 | dump_stack(); |
| 386 | goto exit; |
| 387 | } |
| 388 | if (msg_errcode(msg) || msg_dest_droppable(msg)) |
| 389 | goto exit; |
| 390 | |
| 391 | /* |
| 392 | * construct returned message by copying rejected message header and |
| 393 | * data (or subset), then updating header fields that need adjusting |
| 394 | */ |
| 395 | hdr_sz = msg_hdr_sz(msg); |
| 396 | rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE); |
| 397 | |
| 398 | rbuf = tipc_buf_acquire(rmsg_sz); |
| 399 | if (rbuf == NULL) |
| 400 | goto exit; |
| 401 | |
| 402 | rmsg = buf_msg(rbuf); |
| 403 | skb_copy_to_linear_data(rbuf, msg, rmsg_sz); |
| 404 | |
| 405 | if (msg_connected(rmsg)) { |
| 406 | imp = msg_importance(rmsg); |
| 407 | if (imp < TIPC_CRITICAL_IMPORTANCE) |
| 408 | msg_set_importance(rmsg, ++imp); |
| 409 | } |
| 410 | msg_set_non_seq(rmsg, 0); |
| 411 | msg_set_size(rmsg, rmsg_sz); |
| 412 | msg_set_errcode(rmsg, err); |
| 413 | msg_set_prevnode(rmsg, tipc_own_addr); |
| 414 | msg_swap_words(rmsg, 4, 5); |
| 415 | if (!msg_short(rmsg)) |
| 416 | msg_swap_words(rmsg, 6, 7); |
| 417 | |
| 418 | /* send self-abort message when rejecting on a connected port */ |
| 419 | if (msg_connected(msg)) { |
| 420 | struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg)); |
| 421 | |
| 422 | if (p_ptr) { |
| 423 | struct sk_buff *abuf = NULL; |
| 424 | |
| 425 | if (p_ptr->connected) |
| 426 | abuf = port_build_self_abort_msg(p_ptr, err); |
| 427 | tipc_port_unlock(p_ptr); |
| 428 | tipc_net_route_msg(abuf); |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | /* send returned message & dispose of rejected message */ |
| 433 | src_node = msg_prevnode(msg); |
| 434 | if (in_own_node(src_node)) |
| 435 | tipc_port_recv_msg(rbuf); |
| 436 | else |
| 437 | tipc_link_send(rbuf, src_node, msg_link_selector(rmsg)); |
| 438 | exit: |
| 439 | kfree_skb(buf); |
| 440 | return data_sz; |
| 441 | } |
| 442 | |
| 443 | int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr, |
| 444 | struct iovec const *msg_sect, u32 num_sect, |
| 445 | unsigned int total_len, int err) |
| 446 | { |
| 447 | struct sk_buff *buf; |
| 448 | int res; |
| 449 | |
| 450 | res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE, |
| 451 | !p_ptr->user_port, &buf); |
| 452 | if (!buf) |
| 453 | return res; |
| 454 | |
| 455 | return tipc_reject_msg(buf, err); |
| 456 | } |
| 457 | |
| 458 | static void port_timeout(unsigned long ref) |
| 459 | { |
| 460 | struct tipc_port *p_ptr = tipc_port_lock(ref); |
| 461 | struct sk_buff *buf = NULL; |
| 462 | |
| 463 | if (!p_ptr) |
| 464 | return; |
| 465 | |
| 466 | if (!p_ptr->connected) { |
| 467 | tipc_port_unlock(p_ptr); |
| 468 | return; |
| 469 | } |
| 470 | |
| 471 | /* Last probe answered ? */ |
| 472 | if (p_ptr->probing_state == PROBING) { |
| 473 | buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT); |
| 474 | } else { |
| 475 | buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0); |
| 476 | p_ptr->probing_state = PROBING; |
| 477 | k_start_timer(&p_ptr->timer, p_ptr->probing_interval); |
| 478 | } |
| 479 | tipc_port_unlock(p_ptr); |
| 480 | tipc_net_route_msg(buf); |
| 481 | } |
| 482 | |
| 483 | |
| 484 | static void port_handle_node_down(unsigned long ref) |
| 485 | { |
| 486 | struct tipc_port *p_ptr = tipc_port_lock(ref); |
| 487 | struct sk_buff *buf = NULL; |
| 488 | |
| 489 | if (!p_ptr) |
| 490 | return; |
| 491 | buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE); |
| 492 | tipc_port_unlock(p_ptr); |
| 493 | tipc_net_route_msg(buf); |
| 494 | } |
| 495 | |
| 496 | |
| 497 | static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err) |
| 498 | { |
| 499 | struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err); |
| 500 | |
| 501 | if (buf) { |
| 502 | struct tipc_msg *msg = buf_msg(buf); |
| 503 | msg_swap_words(msg, 4, 5); |
| 504 | msg_swap_words(msg, 6, 7); |
| 505 | } |
| 506 | return buf; |
| 507 | } |
| 508 | |
| 509 | |
| 510 | static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err) |
| 511 | { |
| 512 | struct sk_buff *buf; |
| 513 | struct tipc_msg *msg; |
| 514 | u32 imp; |
| 515 | |
| 516 | if (!p_ptr->connected) |
| 517 | return NULL; |
| 518 | |
| 519 | buf = tipc_buf_acquire(BASIC_H_SIZE); |
| 520 | if (buf) { |
| 521 | msg = buf_msg(buf); |
| 522 | memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE); |
| 523 | msg_set_hdr_sz(msg, BASIC_H_SIZE); |
| 524 | msg_set_size(msg, BASIC_H_SIZE); |
| 525 | imp = msg_importance(msg); |
| 526 | if (imp < TIPC_CRITICAL_IMPORTANCE) |
| 527 | msg_set_importance(msg, ++imp); |
| 528 | msg_set_errcode(msg, err); |
| 529 | } |
| 530 | return buf; |
| 531 | } |
| 532 | |
| 533 | void tipc_port_recv_proto_msg(struct sk_buff *buf) |
| 534 | { |
| 535 | struct tipc_msg *msg = buf_msg(buf); |
| 536 | struct tipc_port *p_ptr; |
| 537 | struct sk_buff *r_buf = NULL; |
| 538 | u32 destport = msg_destport(msg); |
| 539 | int wakeable; |
| 540 | |
| 541 | /* Validate connection */ |
| 542 | p_ptr = tipc_port_lock(destport); |
| 543 | if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) { |
| 544 | r_buf = tipc_buf_acquire(BASIC_H_SIZE); |
| 545 | if (r_buf) { |
| 546 | msg = buf_msg(r_buf); |
| 547 | tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG, |
| 548 | BASIC_H_SIZE, msg_orignode(msg)); |
| 549 | msg_set_errcode(msg, TIPC_ERR_NO_PORT); |
| 550 | msg_set_origport(msg, destport); |
| 551 | msg_set_destport(msg, msg_origport(msg)); |
| 552 | } |
| 553 | if (p_ptr) |
| 554 | tipc_port_unlock(p_ptr); |
| 555 | goto exit; |
| 556 | } |
| 557 | |
| 558 | /* Process protocol message sent by peer */ |
| 559 | switch (msg_type(msg)) { |
| 560 | case CONN_ACK: |
| 561 | wakeable = tipc_port_congested(p_ptr) && p_ptr->congested && |
| 562 | p_ptr->wakeup; |
| 563 | p_ptr->acked += msg_msgcnt(msg); |
| 564 | if (!tipc_port_congested(p_ptr)) { |
| 565 | p_ptr->congested = 0; |
| 566 | if (wakeable) |
| 567 | p_ptr->wakeup(p_ptr); |
| 568 | } |
| 569 | break; |
| 570 | case CONN_PROBE: |
| 571 | r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0); |
| 572 | break; |
| 573 | default: |
| 574 | /* CONN_PROBE_REPLY or unrecognized - no action required */ |
| 575 | break; |
| 576 | } |
| 577 | p_ptr->probing_state = CONFIRMED; |
| 578 | tipc_port_unlock(p_ptr); |
| 579 | exit: |
| 580 | tipc_net_route_msg(r_buf); |
| 581 | kfree_skb(buf); |
| 582 | } |
| 583 | |
| 584 | static int port_print(struct tipc_port *p_ptr, char *buf, int len, int full_id) |
| 585 | { |
| 586 | struct publication *publ; |
| 587 | int ret; |
| 588 | |
| 589 | if (full_id) |
| 590 | ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:", |
| 591 | tipc_zone(tipc_own_addr), |
| 592 | tipc_cluster(tipc_own_addr), |
| 593 | tipc_node(tipc_own_addr), p_ptr->ref); |
| 594 | else |
| 595 | ret = tipc_snprintf(buf, len, "%-10u:", p_ptr->ref); |
| 596 | |
| 597 | if (p_ptr->connected) { |
| 598 | u32 dport = port_peerport(p_ptr); |
| 599 | u32 destnode = port_peernode(p_ptr); |
| 600 | |
| 601 | ret += tipc_snprintf(buf + ret, len - ret, |
| 602 | " connected to <%u.%u.%u:%u>", |
| 603 | tipc_zone(destnode), |
| 604 | tipc_cluster(destnode), |
| 605 | tipc_node(destnode), dport); |
| 606 | if (p_ptr->conn_type != 0) |
| 607 | ret += tipc_snprintf(buf + ret, len - ret, |
| 608 | " via {%u,%u}", p_ptr->conn_type, |
| 609 | p_ptr->conn_instance); |
| 610 | } else if (p_ptr->published) { |
| 611 | ret += tipc_snprintf(buf + ret, len - ret, " bound to"); |
| 612 | list_for_each_entry(publ, &p_ptr->publications, pport_list) { |
| 613 | if (publ->lower == publ->upper) |
| 614 | ret += tipc_snprintf(buf + ret, len - ret, |
| 615 | " {%u,%u}", publ->type, |
| 616 | publ->lower); |
| 617 | else |
| 618 | ret += tipc_snprintf(buf + ret, len - ret, |
| 619 | " {%u,%u,%u}", publ->type, |
| 620 | publ->lower, publ->upper); |
| 621 | } |
| 622 | } |
| 623 | ret += tipc_snprintf(buf + ret, len - ret, "\n"); |
| 624 | return ret; |
| 625 | } |
| 626 | |
| 627 | struct sk_buff *tipc_port_get_ports(void) |
| 628 | { |
| 629 | struct sk_buff *buf; |
| 630 | struct tlv_desc *rep_tlv; |
| 631 | char *pb; |
| 632 | int pb_len; |
| 633 | struct tipc_port *p_ptr; |
| 634 | int str_len = 0; |
| 635 | |
| 636 | buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN)); |
| 637 | if (!buf) |
| 638 | return NULL; |
| 639 | rep_tlv = (struct tlv_desc *)buf->data; |
| 640 | pb = TLV_DATA(rep_tlv); |
| 641 | pb_len = ULTRA_STRING_MAX_LEN; |
| 642 | |
| 643 | spin_lock_bh(&tipc_port_list_lock); |
| 644 | list_for_each_entry(p_ptr, &ports, port_list) { |
| 645 | spin_lock_bh(p_ptr->lock); |
| 646 | str_len += port_print(p_ptr, pb, pb_len, 0); |
| 647 | spin_unlock_bh(p_ptr->lock); |
| 648 | } |
| 649 | spin_unlock_bh(&tipc_port_list_lock); |
| 650 | str_len += 1; /* for "\0" */ |
| 651 | skb_put(buf, TLV_SPACE(str_len)); |
| 652 | TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len); |
| 653 | |
| 654 | return buf; |
| 655 | } |
| 656 | |
| 657 | void tipc_port_reinit(void) |
| 658 | { |
| 659 | struct tipc_port *p_ptr; |
| 660 | struct tipc_msg *msg; |
| 661 | |
| 662 | spin_lock_bh(&tipc_port_list_lock); |
| 663 | list_for_each_entry(p_ptr, &ports, port_list) { |
| 664 | msg = &p_ptr->phdr; |
| 665 | msg_set_prevnode(msg, tipc_own_addr); |
| 666 | msg_set_orignode(msg, tipc_own_addr); |
| 667 | } |
| 668 | spin_unlock_bh(&tipc_port_list_lock); |
| 669 | } |
| 670 | |
| 671 | |
| 672 | /* |
| 673 | * port_dispatcher_sigh(): Signal handler for messages destinated |
| 674 | * to the tipc_port interface. |
| 675 | */ |
| 676 | static void port_dispatcher_sigh(void *dummy) |
| 677 | { |
| 678 | struct sk_buff *buf; |
| 679 | |
| 680 | spin_lock_bh(&queue_lock); |
| 681 | buf = msg_queue_head; |
| 682 | msg_queue_head = NULL; |
| 683 | spin_unlock_bh(&queue_lock); |
| 684 | |
| 685 | while (buf) { |
| 686 | struct tipc_port *p_ptr; |
| 687 | struct user_port *up_ptr; |
| 688 | struct tipc_portid orig; |
| 689 | struct tipc_name_seq dseq; |
| 690 | void *usr_handle; |
| 691 | int connected; |
| 692 | int peer_invalid; |
| 693 | int published; |
| 694 | u32 message_type; |
| 695 | |
| 696 | struct sk_buff *next = buf->next; |
| 697 | struct tipc_msg *msg = buf_msg(buf); |
| 698 | u32 dref = msg_destport(msg); |
| 699 | |
| 700 | message_type = msg_type(msg); |
| 701 | if (message_type > TIPC_DIRECT_MSG) |
| 702 | goto reject; /* Unsupported message type */ |
| 703 | |
| 704 | p_ptr = tipc_port_lock(dref); |
| 705 | if (!p_ptr) |
| 706 | goto reject; /* Port deleted while msg in queue */ |
| 707 | |
| 708 | orig.ref = msg_origport(msg); |
| 709 | orig.node = msg_orignode(msg); |
| 710 | up_ptr = p_ptr->user_port; |
| 711 | usr_handle = up_ptr->usr_handle; |
| 712 | connected = p_ptr->connected; |
| 713 | peer_invalid = connected && !tipc_port_peer_msg(p_ptr, msg); |
| 714 | published = p_ptr->published; |
| 715 | |
| 716 | if (unlikely(msg_errcode(msg))) |
| 717 | goto err; |
| 718 | |
| 719 | switch (message_type) { |
| 720 | |
| 721 | case TIPC_CONN_MSG:{ |
| 722 | tipc_conn_msg_event cb = up_ptr->conn_msg_cb; |
| 723 | u32 dsz; |
| 724 | |
| 725 | tipc_port_unlock(p_ptr); |
| 726 | if (unlikely(!cb)) |
| 727 | goto reject; |
| 728 | if (unlikely(!connected)) { |
| 729 | if (tipc_connect(dref, &orig)) |
| 730 | goto reject; |
| 731 | } else if (peer_invalid) |
| 732 | goto reject; |
| 733 | dsz = msg_data_sz(msg); |
| 734 | if (unlikely(dsz && |
| 735 | (++p_ptr->conn_unacked >= |
| 736 | TIPC_FLOW_CONTROL_WIN))) |
| 737 | tipc_acknowledge(dref, |
| 738 | p_ptr->conn_unacked); |
| 739 | skb_pull(buf, msg_hdr_sz(msg)); |
| 740 | cb(usr_handle, dref, &buf, msg_data(msg), dsz); |
| 741 | break; |
| 742 | } |
| 743 | case TIPC_DIRECT_MSG:{ |
| 744 | tipc_msg_event cb = up_ptr->msg_cb; |
| 745 | |
| 746 | tipc_port_unlock(p_ptr); |
| 747 | if (unlikely(!cb || connected)) |
| 748 | goto reject; |
| 749 | skb_pull(buf, msg_hdr_sz(msg)); |
| 750 | cb(usr_handle, dref, &buf, msg_data(msg), |
| 751 | msg_data_sz(msg), msg_importance(msg), |
| 752 | &orig); |
| 753 | break; |
| 754 | } |
| 755 | case TIPC_MCAST_MSG: |
| 756 | case TIPC_NAMED_MSG:{ |
| 757 | tipc_named_msg_event cb = up_ptr->named_msg_cb; |
| 758 | |
| 759 | tipc_port_unlock(p_ptr); |
| 760 | if (unlikely(!cb || connected || !published)) |
| 761 | goto reject; |
| 762 | dseq.type = msg_nametype(msg); |
| 763 | dseq.lower = msg_nameinst(msg); |
| 764 | dseq.upper = (message_type == TIPC_NAMED_MSG) |
| 765 | ? dseq.lower : msg_nameupper(msg); |
| 766 | skb_pull(buf, msg_hdr_sz(msg)); |
| 767 | cb(usr_handle, dref, &buf, msg_data(msg), |
| 768 | msg_data_sz(msg), msg_importance(msg), |
| 769 | &orig, &dseq); |
| 770 | break; |
| 771 | } |
| 772 | } |
| 773 | if (buf) |
| 774 | kfree_skb(buf); |
| 775 | buf = next; |
| 776 | continue; |
| 777 | err: |
| 778 | switch (message_type) { |
| 779 | |
| 780 | case TIPC_CONN_MSG:{ |
| 781 | tipc_conn_shutdown_event cb = |
| 782 | up_ptr->conn_err_cb; |
| 783 | |
| 784 | tipc_port_unlock(p_ptr); |
| 785 | if (!cb || !connected || peer_invalid) |
| 786 | break; |
| 787 | tipc_disconnect(dref); |
| 788 | skb_pull(buf, msg_hdr_sz(msg)); |
| 789 | cb(usr_handle, dref, &buf, msg_data(msg), |
| 790 | msg_data_sz(msg), msg_errcode(msg)); |
| 791 | break; |
| 792 | } |
| 793 | case TIPC_DIRECT_MSG:{ |
| 794 | tipc_msg_err_event cb = up_ptr->err_cb; |
| 795 | |
| 796 | tipc_port_unlock(p_ptr); |
| 797 | if (!cb || connected) |
| 798 | break; |
| 799 | skb_pull(buf, msg_hdr_sz(msg)); |
| 800 | cb(usr_handle, dref, &buf, msg_data(msg), |
| 801 | msg_data_sz(msg), msg_errcode(msg), &orig); |
| 802 | break; |
| 803 | } |
| 804 | case TIPC_MCAST_MSG: |
| 805 | case TIPC_NAMED_MSG:{ |
| 806 | tipc_named_msg_err_event cb = |
| 807 | up_ptr->named_err_cb; |
| 808 | |
| 809 | tipc_port_unlock(p_ptr); |
| 810 | if (!cb || connected) |
| 811 | break; |
| 812 | dseq.type = msg_nametype(msg); |
| 813 | dseq.lower = msg_nameinst(msg); |
| 814 | dseq.upper = (message_type == TIPC_NAMED_MSG) |
| 815 | ? dseq.lower : msg_nameupper(msg); |
| 816 | skb_pull(buf, msg_hdr_sz(msg)); |
| 817 | cb(usr_handle, dref, &buf, msg_data(msg), |
| 818 | msg_data_sz(msg), msg_errcode(msg), &dseq); |
| 819 | break; |
| 820 | } |
| 821 | } |
| 822 | if (buf) |
| 823 | kfree_skb(buf); |
| 824 | buf = next; |
| 825 | continue; |
| 826 | reject: |
| 827 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
| 828 | buf = next; |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * port_dispatcher(): Dispatcher for messages destinated |
| 834 | * to the tipc_port interface. Called with port locked. |
| 835 | */ |
| 836 | static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf) |
| 837 | { |
| 838 | buf->next = NULL; |
| 839 | spin_lock_bh(&queue_lock); |
| 840 | if (msg_queue_head) { |
| 841 | msg_queue_tail->next = buf; |
| 842 | msg_queue_tail = buf; |
| 843 | } else { |
| 844 | msg_queue_tail = msg_queue_head = buf; |
| 845 | tipc_k_signal((Handler)port_dispatcher_sigh, 0); |
| 846 | } |
| 847 | spin_unlock_bh(&queue_lock); |
| 848 | return 0; |
| 849 | } |
| 850 | |
| 851 | /* |
| 852 | * Wake up port after congestion: Called with port locked |
| 853 | */ |
| 854 | static void port_wakeup_sh(unsigned long ref) |
| 855 | { |
| 856 | struct tipc_port *p_ptr; |
| 857 | struct user_port *up_ptr; |
| 858 | tipc_continue_event cb = NULL; |
| 859 | void *uh = NULL; |
| 860 | |
| 861 | p_ptr = tipc_port_lock(ref); |
| 862 | if (p_ptr) { |
| 863 | up_ptr = p_ptr->user_port; |
| 864 | if (up_ptr) { |
| 865 | cb = up_ptr->continue_event_cb; |
| 866 | uh = up_ptr->usr_handle; |
| 867 | } |
| 868 | tipc_port_unlock(p_ptr); |
| 869 | } |
| 870 | if (cb) |
| 871 | cb(uh, ref); |
| 872 | } |
| 873 | |
| 874 | |
| 875 | static void port_wakeup(struct tipc_port *p_ptr) |
| 876 | { |
| 877 | tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref); |
| 878 | } |
| 879 | |
| 880 | void tipc_acknowledge(u32 ref, u32 ack) |
| 881 | { |
| 882 | struct tipc_port *p_ptr; |
| 883 | struct sk_buff *buf = NULL; |
| 884 | |
| 885 | p_ptr = tipc_port_lock(ref); |
| 886 | if (!p_ptr) |
| 887 | return; |
| 888 | if (p_ptr->connected) { |
| 889 | p_ptr->conn_unacked -= ack; |
| 890 | buf = port_build_proto_msg(p_ptr, CONN_ACK, ack); |
| 891 | } |
| 892 | tipc_port_unlock(p_ptr); |
| 893 | tipc_net_route_msg(buf); |
| 894 | } |
| 895 | |
| 896 | /* |
| 897 | * tipc_createport(): user level call. |
| 898 | */ |
| 899 | int tipc_createport(void *usr_handle, |
| 900 | unsigned int importance, |
| 901 | tipc_msg_err_event error_cb, |
| 902 | tipc_named_msg_err_event named_error_cb, |
| 903 | tipc_conn_shutdown_event conn_error_cb, |
| 904 | tipc_msg_event msg_cb, |
| 905 | tipc_named_msg_event named_msg_cb, |
| 906 | tipc_conn_msg_event conn_msg_cb, |
| 907 | tipc_continue_event continue_event_cb, /* May be zero */ |
| 908 | u32 *portref) |
| 909 | { |
| 910 | struct user_port *up_ptr; |
| 911 | struct tipc_port *p_ptr; |
| 912 | |
| 913 | up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC); |
| 914 | if (!up_ptr) { |
| 915 | pr_warn("Port creation failed, no memory\n"); |
| 916 | return -ENOMEM; |
| 917 | } |
| 918 | p_ptr = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, |
| 919 | importance); |
| 920 | if (!p_ptr) { |
| 921 | kfree(up_ptr); |
| 922 | return -ENOMEM; |
| 923 | } |
| 924 | |
| 925 | p_ptr->user_port = up_ptr; |
| 926 | up_ptr->usr_handle = usr_handle; |
| 927 | up_ptr->ref = p_ptr->ref; |
| 928 | up_ptr->err_cb = error_cb; |
| 929 | up_ptr->named_err_cb = named_error_cb; |
| 930 | up_ptr->conn_err_cb = conn_error_cb; |
| 931 | up_ptr->msg_cb = msg_cb; |
| 932 | up_ptr->named_msg_cb = named_msg_cb; |
| 933 | up_ptr->conn_msg_cb = conn_msg_cb; |
| 934 | up_ptr->continue_event_cb = continue_event_cb; |
| 935 | *portref = p_ptr->ref; |
| 936 | tipc_port_unlock(p_ptr); |
| 937 | return 0; |
| 938 | } |
| 939 | |
| 940 | int tipc_portimportance(u32 ref, unsigned int *importance) |
| 941 | { |
| 942 | struct tipc_port *p_ptr; |
| 943 | |
| 944 | p_ptr = tipc_port_lock(ref); |
| 945 | if (!p_ptr) |
| 946 | return -EINVAL; |
| 947 | *importance = (unsigned int)msg_importance(&p_ptr->phdr); |
| 948 | tipc_port_unlock(p_ptr); |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | int tipc_set_portimportance(u32 ref, unsigned int imp) |
| 953 | { |
| 954 | struct tipc_port *p_ptr; |
| 955 | |
| 956 | if (imp > TIPC_CRITICAL_IMPORTANCE) |
| 957 | return -EINVAL; |
| 958 | |
| 959 | p_ptr = tipc_port_lock(ref); |
| 960 | if (!p_ptr) |
| 961 | return -EINVAL; |
| 962 | msg_set_importance(&p_ptr->phdr, (u32)imp); |
| 963 | tipc_port_unlock(p_ptr); |
| 964 | return 0; |
| 965 | } |
| 966 | |
| 967 | |
| 968 | int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq) |
| 969 | { |
| 970 | struct tipc_port *p_ptr; |
| 971 | struct publication *publ; |
| 972 | u32 key; |
| 973 | int res = -EINVAL; |
| 974 | |
| 975 | p_ptr = tipc_port_lock(ref); |
| 976 | if (!p_ptr) |
| 977 | return -EINVAL; |
| 978 | |
| 979 | if (p_ptr->connected) |
| 980 | goto exit; |
| 981 | key = ref + p_ptr->pub_count + 1; |
| 982 | if (key == ref) { |
| 983 | res = -EADDRINUSE; |
| 984 | goto exit; |
| 985 | } |
| 986 | publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper, |
| 987 | scope, p_ptr->ref, key); |
| 988 | if (publ) { |
| 989 | list_add(&publ->pport_list, &p_ptr->publications); |
| 990 | p_ptr->pub_count++; |
| 991 | p_ptr->published = 1; |
| 992 | res = 0; |
| 993 | } |
| 994 | exit: |
| 995 | tipc_port_unlock(p_ptr); |
| 996 | return res; |
| 997 | } |
| 998 | |
| 999 | int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq) |
| 1000 | { |
| 1001 | struct tipc_port *p_ptr; |
| 1002 | struct publication *publ; |
| 1003 | struct publication *tpubl; |
| 1004 | int res = -EINVAL; |
| 1005 | |
| 1006 | p_ptr = tipc_port_lock(ref); |
| 1007 | if (!p_ptr) |
| 1008 | return -EINVAL; |
| 1009 | if (!seq) { |
| 1010 | list_for_each_entry_safe(publ, tpubl, |
| 1011 | &p_ptr->publications, pport_list) { |
| 1012 | tipc_nametbl_withdraw(publ->type, publ->lower, |
| 1013 | publ->ref, publ->key); |
| 1014 | } |
| 1015 | res = 0; |
| 1016 | } else { |
| 1017 | list_for_each_entry_safe(publ, tpubl, |
| 1018 | &p_ptr->publications, pport_list) { |
| 1019 | if (publ->scope != scope) |
| 1020 | continue; |
| 1021 | if (publ->type != seq->type) |
| 1022 | continue; |
| 1023 | if (publ->lower != seq->lower) |
| 1024 | continue; |
| 1025 | if (publ->upper != seq->upper) |
| 1026 | break; |
| 1027 | tipc_nametbl_withdraw(publ->type, publ->lower, |
| 1028 | publ->ref, publ->key); |
| 1029 | res = 0; |
| 1030 | break; |
| 1031 | } |
| 1032 | } |
| 1033 | if (list_empty(&p_ptr->publications)) |
| 1034 | p_ptr->published = 0; |
| 1035 | tipc_port_unlock(p_ptr); |
| 1036 | return res; |
| 1037 | } |
| 1038 | |
| 1039 | int tipc_connect(u32 ref, struct tipc_portid const *peer) |
| 1040 | { |
| 1041 | struct tipc_port *p_ptr; |
| 1042 | int res; |
| 1043 | |
| 1044 | p_ptr = tipc_port_lock(ref); |
| 1045 | if (!p_ptr) |
| 1046 | return -EINVAL; |
| 1047 | res = __tipc_connect(ref, p_ptr, peer); |
| 1048 | tipc_port_unlock(p_ptr); |
| 1049 | return res; |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * __tipc_connect - connect to a remote peer |
| 1054 | * |
| 1055 | * Port must be locked. |
| 1056 | */ |
| 1057 | int __tipc_connect(u32 ref, struct tipc_port *p_ptr, |
| 1058 | struct tipc_portid const *peer) |
| 1059 | { |
| 1060 | struct tipc_msg *msg; |
| 1061 | int res = -EINVAL; |
| 1062 | |
| 1063 | if (p_ptr->published || p_ptr->connected) |
| 1064 | goto exit; |
| 1065 | if (!peer->ref) |
| 1066 | goto exit; |
| 1067 | |
| 1068 | msg = &p_ptr->phdr; |
| 1069 | msg_set_destnode(msg, peer->node); |
| 1070 | msg_set_destport(msg, peer->ref); |
| 1071 | msg_set_type(msg, TIPC_CONN_MSG); |
| 1072 | msg_set_lookup_scope(msg, 0); |
| 1073 | msg_set_hdr_sz(msg, SHORT_H_SIZE); |
| 1074 | |
| 1075 | p_ptr->probing_interval = PROBING_INTERVAL; |
| 1076 | p_ptr->probing_state = CONFIRMED; |
| 1077 | p_ptr->connected = 1; |
| 1078 | k_start_timer(&p_ptr->timer, p_ptr->probing_interval); |
| 1079 | |
| 1080 | tipc_nodesub_subscribe(&p_ptr->subscription, peer->node, |
| 1081 | (void *)(unsigned long)ref, |
| 1082 | (net_ev_handler)port_handle_node_down); |
| 1083 | res = 0; |
| 1084 | exit: |
| 1085 | p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref); |
| 1086 | return res; |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * __tipc_disconnect - disconnect port from peer |
| 1091 | * |
| 1092 | * Port must be locked. |
| 1093 | */ |
| 1094 | int __tipc_disconnect(struct tipc_port *tp_ptr) |
| 1095 | { |
| 1096 | int res; |
| 1097 | |
| 1098 | if (tp_ptr->connected) { |
| 1099 | tp_ptr->connected = 0; |
| 1100 | /* let timer expire on it's own to avoid deadlock! */ |
| 1101 | tipc_nodesub_unsubscribe(&tp_ptr->subscription); |
| 1102 | res = 0; |
| 1103 | } else { |
| 1104 | res = -ENOTCONN; |
| 1105 | } |
| 1106 | return res; |
| 1107 | } |
| 1108 | |
| 1109 | /* |
| 1110 | * tipc_disconnect(): Disconnect port form peer. |
| 1111 | * This is a node local operation. |
| 1112 | */ |
| 1113 | int tipc_disconnect(u32 ref) |
| 1114 | { |
| 1115 | struct tipc_port *p_ptr; |
| 1116 | int res; |
| 1117 | |
| 1118 | p_ptr = tipc_port_lock(ref); |
| 1119 | if (!p_ptr) |
| 1120 | return -EINVAL; |
| 1121 | res = __tipc_disconnect(p_ptr); |
| 1122 | tipc_port_unlock(p_ptr); |
| 1123 | return res; |
| 1124 | } |
| 1125 | |
| 1126 | /* |
| 1127 | * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect |
| 1128 | */ |
| 1129 | int tipc_shutdown(u32 ref) |
| 1130 | { |
| 1131 | struct tipc_port *p_ptr; |
| 1132 | struct sk_buff *buf = NULL; |
| 1133 | |
| 1134 | p_ptr = tipc_port_lock(ref); |
| 1135 | if (!p_ptr) |
| 1136 | return -EINVAL; |
| 1137 | |
| 1138 | buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN); |
| 1139 | tipc_port_unlock(p_ptr); |
| 1140 | tipc_net_route_msg(buf); |
| 1141 | return tipc_disconnect(ref); |
| 1142 | } |
| 1143 | |
| 1144 | /** |
| 1145 | * tipc_port_recv_msg - receive message from lower layer and deliver to port user |
| 1146 | */ |
| 1147 | int tipc_port_recv_msg(struct sk_buff *buf) |
| 1148 | { |
| 1149 | struct tipc_port *p_ptr; |
| 1150 | struct tipc_msg *msg = buf_msg(buf); |
| 1151 | u32 destport = msg_destport(msg); |
| 1152 | u32 dsz = msg_data_sz(msg); |
| 1153 | u32 err; |
| 1154 | |
| 1155 | /* forward unresolved named message */ |
| 1156 | if (unlikely(!destport)) { |
| 1157 | tipc_net_route_msg(buf); |
| 1158 | return dsz; |
| 1159 | } |
| 1160 | |
| 1161 | /* validate destination & pass to port, otherwise reject message */ |
| 1162 | p_ptr = tipc_port_lock(destport); |
| 1163 | if (likely(p_ptr)) { |
| 1164 | err = p_ptr->dispatcher(p_ptr, buf); |
| 1165 | tipc_port_unlock(p_ptr); |
| 1166 | if (likely(!err)) |
| 1167 | return dsz; |
| 1168 | } else { |
| 1169 | err = TIPC_ERR_NO_PORT; |
| 1170 | } |
| 1171 | |
| 1172 | return tipc_reject_msg(buf, err); |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * tipc_port_recv_sections(): Concatenate and deliver sectioned |
| 1177 | * message for this node. |
| 1178 | */ |
| 1179 | static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect, |
| 1180 | struct iovec const *msg_sect, |
| 1181 | unsigned int total_len) |
| 1182 | { |
| 1183 | struct sk_buff *buf; |
| 1184 | int res; |
| 1185 | |
| 1186 | res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len, |
| 1187 | MAX_MSG_SIZE, !sender->user_port, &buf); |
| 1188 | if (likely(buf)) |
| 1189 | tipc_port_recv_msg(buf); |
| 1190 | return res; |
| 1191 | } |
| 1192 | |
| 1193 | /** |
| 1194 | * tipc_send - send message sections on connection |
| 1195 | */ |
| 1196 | int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect, |
| 1197 | unsigned int total_len) |
| 1198 | { |
| 1199 | struct tipc_port *p_ptr; |
| 1200 | u32 destnode; |
| 1201 | int res; |
| 1202 | |
| 1203 | p_ptr = tipc_port_deref(ref); |
| 1204 | if (!p_ptr || !p_ptr->connected) |
| 1205 | return -EINVAL; |
| 1206 | |
| 1207 | p_ptr->congested = 1; |
| 1208 | if (!tipc_port_congested(p_ptr)) { |
| 1209 | destnode = port_peernode(p_ptr); |
| 1210 | if (likely(!in_own_node(destnode))) |
| 1211 | res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, |
| 1212 | total_len, destnode); |
| 1213 | else |
| 1214 | res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect, |
| 1215 | total_len); |
| 1216 | |
| 1217 | if (likely(res != -ELINKCONG)) { |
| 1218 | p_ptr->congested = 0; |
| 1219 | if (res > 0) |
| 1220 | p_ptr->sent++; |
| 1221 | return res; |
| 1222 | } |
| 1223 | } |
| 1224 | if (port_unreliable(p_ptr)) { |
| 1225 | p_ptr->congested = 0; |
| 1226 | return total_len; |
| 1227 | } |
| 1228 | return -ELINKCONG; |
| 1229 | } |
| 1230 | |
| 1231 | /** |
| 1232 | * tipc_send2name - send message sections to port name |
| 1233 | */ |
| 1234 | int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain, |
| 1235 | unsigned int num_sect, struct iovec const *msg_sect, |
| 1236 | unsigned int total_len) |
| 1237 | { |
| 1238 | struct tipc_port *p_ptr; |
| 1239 | struct tipc_msg *msg; |
| 1240 | u32 destnode = domain; |
| 1241 | u32 destport; |
| 1242 | int res; |
| 1243 | |
| 1244 | p_ptr = tipc_port_deref(ref); |
| 1245 | if (!p_ptr || p_ptr->connected) |
| 1246 | return -EINVAL; |
| 1247 | |
| 1248 | msg = &p_ptr->phdr; |
| 1249 | msg_set_type(msg, TIPC_NAMED_MSG); |
| 1250 | msg_set_hdr_sz(msg, NAMED_H_SIZE); |
| 1251 | msg_set_nametype(msg, name->type); |
| 1252 | msg_set_nameinst(msg, name->instance); |
| 1253 | msg_set_lookup_scope(msg, tipc_addr_scope(domain)); |
| 1254 | destport = tipc_nametbl_translate(name->type, name->instance, &destnode); |
| 1255 | msg_set_destnode(msg, destnode); |
| 1256 | msg_set_destport(msg, destport); |
| 1257 | |
| 1258 | if (likely(destport || destnode)) { |
| 1259 | if (likely(in_own_node(destnode))) |
| 1260 | res = tipc_port_recv_sections(p_ptr, num_sect, |
| 1261 | msg_sect, total_len); |
| 1262 | else if (tipc_own_addr) |
| 1263 | res = tipc_link_send_sections_fast(p_ptr, msg_sect, |
| 1264 | num_sect, total_len, |
| 1265 | destnode); |
| 1266 | else |
| 1267 | res = tipc_port_reject_sections(p_ptr, msg, msg_sect, |
| 1268 | num_sect, total_len, |
| 1269 | TIPC_ERR_NO_NODE); |
| 1270 | if (likely(res != -ELINKCONG)) { |
| 1271 | if (res > 0) |
| 1272 | p_ptr->sent++; |
| 1273 | return res; |
| 1274 | } |
| 1275 | if (port_unreliable(p_ptr)) { |
| 1276 | return total_len; |
| 1277 | } |
| 1278 | return -ELINKCONG; |
| 1279 | } |
| 1280 | return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect, |
| 1281 | total_len, TIPC_ERR_NO_NAME); |
| 1282 | } |
| 1283 | |
| 1284 | /** |
| 1285 | * tipc_send2port - send message sections to port identity |
| 1286 | */ |
| 1287 | int tipc_send2port(u32 ref, struct tipc_portid const *dest, |
| 1288 | unsigned int num_sect, struct iovec const *msg_sect, |
| 1289 | unsigned int total_len) |
| 1290 | { |
| 1291 | struct tipc_port *p_ptr; |
| 1292 | struct tipc_msg *msg; |
| 1293 | int res; |
| 1294 | |
| 1295 | p_ptr = tipc_port_deref(ref); |
| 1296 | if (!p_ptr || p_ptr->connected) |
| 1297 | return -EINVAL; |
| 1298 | |
| 1299 | msg = &p_ptr->phdr; |
| 1300 | msg_set_type(msg, TIPC_DIRECT_MSG); |
| 1301 | msg_set_lookup_scope(msg, 0); |
| 1302 | msg_set_destnode(msg, dest->node); |
| 1303 | msg_set_destport(msg, dest->ref); |
| 1304 | msg_set_hdr_sz(msg, BASIC_H_SIZE); |
| 1305 | |
| 1306 | if (in_own_node(dest->node)) |
| 1307 | res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect, |
| 1308 | total_len); |
| 1309 | else if (tipc_own_addr) |
| 1310 | res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, |
| 1311 | total_len, dest->node); |
| 1312 | else |
| 1313 | res = tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect, |
| 1314 | total_len, TIPC_ERR_NO_NODE); |
| 1315 | if (likely(res != -ELINKCONG)) { |
| 1316 | if (res > 0) |
| 1317 | p_ptr->sent++; |
| 1318 | return res; |
| 1319 | } |
| 1320 | if (port_unreliable(p_ptr)) { |
| 1321 | return total_len; |
| 1322 | } |
| 1323 | return -ELINKCONG; |
| 1324 | } |
| 1325 | |
| 1326 | /** |
| 1327 | * tipc_send_buf2port - send message buffer to port identity |
| 1328 | */ |
| 1329 | int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest, |
| 1330 | struct sk_buff *buf, unsigned int dsz) |
| 1331 | { |
| 1332 | struct tipc_port *p_ptr; |
| 1333 | struct tipc_msg *msg; |
| 1334 | int res; |
| 1335 | |
| 1336 | p_ptr = (struct tipc_port *)tipc_ref_deref(ref); |
| 1337 | if (!p_ptr || p_ptr->connected) |
| 1338 | return -EINVAL; |
| 1339 | |
| 1340 | msg = &p_ptr->phdr; |
| 1341 | msg_set_type(msg, TIPC_DIRECT_MSG); |
| 1342 | msg_set_destnode(msg, dest->node); |
| 1343 | msg_set_destport(msg, dest->ref); |
| 1344 | msg_set_hdr_sz(msg, BASIC_H_SIZE); |
| 1345 | msg_set_size(msg, BASIC_H_SIZE + dsz); |
| 1346 | if (skb_cow(buf, BASIC_H_SIZE)) |
| 1347 | return -ENOMEM; |
| 1348 | |
| 1349 | skb_push(buf, BASIC_H_SIZE); |
| 1350 | skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE); |
| 1351 | |
| 1352 | if (in_own_node(dest->node)) |
| 1353 | res = tipc_port_recv_msg(buf); |
| 1354 | else |
| 1355 | res = tipc_send_buf_fast(buf, dest->node); |
| 1356 | if (likely(res != -ELINKCONG)) { |
| 1357 | if (res > 0) |
| 1358 | p_ptr->sent++; |
| 1359 | return res; |
| 1360 | } |
| 1361 | if (port_unreliable(p_ptr)) |
| 1362 | return dsz; |
| 1363 | return -ELINKCONG; |
| 1364 | } |