net/qrtr/ns.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright (c) 2015, Sony Mobile Communications Inc.
   4  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
   5  * Copyright (c) 2020, Linaro Ltd.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/qrtr.h>
  10 #include <linux/workqueue.h>
  11 #include <net/sock.h>
  12
  13 #include "qrtr.h"
  14
  15 #include <trace/events/sock.h>
  16 #define CREATE_TRACE_POINTS
  17 #include <trace/events/qrtr.h>
  18
  19 static DEFINE_XARRAY(nodes);
  20
  21 static struct {
  22         struct socket *sock;
  23         struct sockaddr_qrtr bcast_sq;
  24         struct list_head lookups;
  25         struct workqueue_struct *workqueue;
  26         struct work_struct work;
  27         int local_node;
  28 } qrtr_ns;
  29
  30 static const char * const qrtr_ctrl_pkt_strings[] = {
  31         [QRTR_TYPE_HELLO]       = "hello",
  32         [QRTR_TYPE_BYE]         = "bye",
  33         [QRTR_TYPE_NEW_SERVER]  = "new-server",
  34         [QRTR_TYPE_DEL_SERVER]  = "del-server",
  35         [QRTR_TYPE_DEL_CLIENT]  = "del-client",
  36         [QRTR_TYPE_RESUME_TX]   = "resume-tx",
  37         [QRTR_TYPE_EXIT]        = "exit",
  38         [QRTR_TYPE_PING]        = "ping",
  39         [QRTR_TYPE_NEW_LOOKUP]  = "new-lookup",
  40         [QRTR_TYPE_DEL_LOOKUP]  = "del-lookup",
  41 };
  42
  43 struct qrtr_server_filter {
  44         unsigned int service;
  45         unsigned int instance;
  46         unsigned int ifilter;
  47 };
  48
  49 struct qrtr_lookup {
  50         unsigned int service;
  51         unsigned int instance;
  52
  53         struct sockaddr_qrtr sq;
  54         struct list_head li;
  55 };
  56
  57 struct qrtr_server {
  58         unsigned int service;
  59         unsigned int instance;
  60
  61         unsigned int node;
  62         unsigned int port;
  63
  64         struct list_head qli;
  65 };
  66
  67 struct qrtr_node {
  68         unsigned int id;
  69         struct xarray servers;
  70 };
  71
  72 static struct qrtr_node *node_get(unsigned int node_id)
  73 {
  74         struct qrtr_node *node;
  75
  76         node = xa_load(&nodes, node_id);
  77         if (node)
  78                 return node;
  79
  80         /* If node didn't exist, allocate and insert it to the tree */
  81         node = kzalloc(sizeof(*node), GFP_KERNEL);
  82         if (!node)
  83                 return NULL;
  84
  85         node->id = node_id;
  86         xa_init(&node->servers);
  87
  88         if (xa_store(&nodes, node_id, node, GFP_KERNEL)) {
  89                 kfree(node);
  90                 return NULL;
  91         }
  92
  93         return node;
  94 }
  95
  96 static int server_match(const struct qrtr_server *srv,
  97                         const struct qrtr_server_filter *f)
  98 {
  99         unsigned int ifilter = f->ifilter;
 100
 101         if (f->service != 0 && srv->service != f->service)
 102                 return 0;
 103         if (!ifilter && f->instance)
 104                 ifilter = ~0;
 105
 106         return (srv->instance & ifilter) == f->instance;
 107 }
 108
 109 static int service_announce_new(struct sockaddr_qrtr *dest,
 110                                 struct qrtr_server *srv)
 111 {
 112         struct qrtr_ctrl_pkt pkt;
 113         struct msghdr msg = { };
 114         struct kvec iv;
 115
 116         trace_qrtr_ns_service_announce_new(srv->service, srv->instance,
 117                                            srv->node, srv->port);
 118
 119         iv.iov_base = &pkt;
 120         iv.iov_len = sizeof(pkt);
 121
 122         memset(&pkt, 0, sizeof(pkt));
 123         pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER);
 124         pkt.server.service = cpu_to_le32(srv->service);
 125         pkt.server.instance = cpu_to_le32(srv->instance);
 126         pkt.server.node = cpu_to_le32(srv->node);
 127         pkt.server.port = cpu_to_le32(srv->port);
 128
 129         msg.msg_name = (struct sockaddr *)dest;
 130         msg.msg_namelen = sizeof(*dest);
 131
 132         return kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
 133 }
 134
 135 static int service_announce_del(struct sockaddr_qrtr *dest,
 136                                 struct qrtr_server *srv)
 137 {
 138         struct qrtr_ctrl_pkt pkt;
 139         struct msghdr msg = { };
 140         struct kvec iv;
 141         int ret;
 142
 143         trace_qrtr_ns_service_announce_del(srv->service, srv->instance,
 144                                            srv->node, srv->port);
 145
 146         iv.iov_base = &pkt;
 147         iv.iov_len = sizeof(pkt);
 148
 149         memset(&pkt, 0, sizeof(pkt));
 150         pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_SERVER);
 151         pkt.server.service = cpu_to_le32(srv->service);
 152         pkt.server.instance = cpu_to_le32(srv->instance);
 153         pkt.server.node = cpu_to_le32(srv->node);
 154         pkt.server.port = cpu_to_le32(srv->port);
 155
 156         msg.msg_name = (struct sockaddr *)dest;
 157         msg.msg_namelen = sizeof(*dest);
 158
 159         ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
 160         if (ret < 0)
 161                 pr_err("failed to announce del service\n");
 162
 163         return ret;
 164 }
 165
 166 static void lookup_notify(struct sockaddr_qrtr *to, struct qrtr_server *srv,
 167                           bool new)
 168 {
 169         struct qrtr_ctrl_pkt pkt;
 170         struct msghdr msg = { };
 171         struct kvec iv;
 172         int ret;
 173
 174         iv.iov_base = &pkt;
 175         iv.iov_len = sizeof(pkt);
 176
 177         memset(&pkt, 0, sizeof(pkt));
 178         pkt.cmd = new ? cpu_to_le32(QRTR_TYPE_NEW_SERVER) :
 179                         cpu_to_le32(QRTR_TYPE_DEL_SERVER);
 180         if (srv) {
 181                 pkt.server.service = cpu_to_le32(srv->service);
 182                 pkt.server.instance = cpu_to_le32(srv->instance);
 183                 pkt.server.node = cpu_to_le32(srv->node);
 184                 pkt.server.port = cpu_to_le32(srv->port);
 185         }
 186
 187         msg.msg_name = (struct sockaddr *)to;
 188         msg.msg_namelen = sizeof(*to);
 189
 190         ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
 191         if (ret < 0)
 192                 pr_err("failed to send lookup notification\n");
 193 }
 194
 195 static int announce_servers(struct sockaddr_qrtr *sq)
 196 {
 197         struct qrtr_server *srv;
 198         struct qrtr_node *node;
 199         unsigned long index;
 200         int ret;
 201
 202         node = node_get(qrtr_ns.local_node);
 203         if (!node)
 204                 return 0;
 205
 206         /* Announce the list of servers registered in this node */
 207         xa_for_each(&node->servers, index, srv) {
 208                 ret = service_announce_new(sq, srv);
 209                 if (ret < 0) {
 210                         pr_err("failed to announce new service\n");
 211                         return ret;
 212                 }
 213         }
 214         return 0;
 215 }
 216
 217 static struct qrtr_server *server_add(unsigned int service,
 218                                       unsigned int instance,
 219                                       unsigned int node_id,
 220                                       unsigned int port)
 221 {
 222         struct qrtr_server *srv;
 223         struct qrtr_server *old;
 224         struct qrtr_node *node;
 225
 226         if (!service || !port)
 227                 return NULL;
 228
 229         srv = kzalloc(sizeof(*srv), GFP_KERNEL);
 230         if (!srv)
 231                 return NULL;
 232
 233         srv->service = service;
 234         srv->instance = instance;
 235         srv->node = node_id;
 236         srv->port = port;
 237
 238         node = node_get(node_id);
 239         if (!node)
 240                 goto err;
 241
 242         /* Delete the old server on the same port */
 243         old = xa_store(&node->servers, port, srv, GFP_KERNEL);
 244         if (old) {
 245                 if (xa_is_err(old)) {
 246                         pr_err("failed to add server [0x%x:0x%x] ret:%d\n",
 247                                srv->service, srv->instance, xa_err(old));
 248                         goto err;
 249                 } else {
 250                         kfree(old);
 251                 }
 252         }
 253
 254         trace_qrtr_ns_server_add(srv->service, srv->instance,
 255                                  srv->node, srv->port);
 256
 257         return srv;
 258
 259 err:
 260         kfree(srv);
 261         return NULL;
 262 }
 263
 264 static int server_del(struct qrtr_node *node, unsigned int port, bool bcast)
 265 {
 266         struct qrtr_lookup *lookup;
 267         struct qrtr_server *srv;
 268         struct list_head *li;
 269
 270         srv = xa_load(&node->servers, port);
 271         if (!srv)
 272                 return -ENOENT;
 273
 274         xa_erase(&node->servers, port);
 275
 276         /* Broadcast the removal of local servers */
 277         if (srv->node == qrtr_ns.local_node && bcast)
 278                 service_announce_del(&qrtr_ns.bcast_sq, srv);
 279
 280         /* Announce the service's disappearance to observers */
 281         list_for_each(li, &qrtr_ns.lookups) {
 282                 lookup = container_of(li, struct qrtr_lookup, li);
 283                 if (lookup->service && lookup->service != srv->service)
 284                         continue;
 285                 if (lookup->instance && lookup->instance != srv->instance)
 286                         continue;
 287
 288                 lookup_notify(&lookup->sq, srv, false);
 289         }
 290
 291         kfree(srv);
 292
 293         return 0;
 294 }
 295
 296 static int say_hello(struct sockaddr_qrtr *dest)
 297 {
 298         struct qrtr_ctrl_pkt pkt;
 299         struct msghdr msg = { };
 300         struct kvec iv;
 301         int ret;
 302
 303         iv.iov_base = &pkt;
 304         iv.iov_len = sizeof(pkt);
 305
 306         memset(&pkt, 0, sizeof(pkt));
 307         pkt.cmd = cpu_to_le32(QRTR_TYPE_HELLO);
 308
 309         msg.msg_name = (struct sockaddr *)dest;
 310         msg.msg_namelen = sizeof(*dest);
 311
 312         ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
 313         if (ret < 0)
 314                 pr_err("failed to send hello msg\n");
 315
 316         return ret;
 317 }
 318
 319 /* Announce the list of servers registered on the local node */
 320 static int ctrl_cmd_hello(struct sockaddr_qrtr *sq)
 321 {
 322         int ret;
 323
 324         ret = say_hello(sq);
 325         if (ret < 0)
 326                 return ret;
 327
 328         return announce_servers(sq);
 329 }
 330
 331 static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
 332 {
 333         struct qrtr_node *local_node;
 334         struct qrtr_ctrl_pkt pkt;
 335         struct qrtr_server *srv;
 336         struct sockaddr_qrtr sq;
 337         struct msghdr msg = { };
 338         struct qrtr_node *node;
 339         unsigned long index;
 340         struct kvec iv;
 341         int ret;
 342
 343         iv.iov_base = &pkt;
 344         iv.iov_len = sizeof(pkt);
 345
 346         node = node_get(from->sq_node);
 347         if (!node)
 348                 return 0;
 349
 350         /* Advertise removal of this client to all servers of remote node */
 351         xa_for_each(&node->servers, index, srv)
 352                 server_del(node, srv->port, true);
 353
 354         /* Advertise the removal of this client to all local servers */
 355         local_node = node_get(qrtr_ns.local_node);
 356         if (!local_node)
 357                 return 0;
 358
 359         memset(&pkt, 0, sizeof(pkt));
 360         pkt.cmd = cpu_to_le32(QRTR_TYPE_BYE);
 361         pkt.client.node = cpu_to_le32(from->sq_node);
 362
 363         xa_for_each(&local_node->servers, index, srv) {
 364                 sq.sq_family = AF_QIPCRTR;
 365                 sq.sq_node = srv->node;
 366                 sq.sq_port = srv->port;
 367
 368                 msg.msg_name = (struct sockaddr *)&sq;
 369                 msg.msg_namelen = sizeof(sq);
 370
 371                 ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
 372                 if (ret < 0) {
 373                         pr_err("failed to send bye cmd\n");
 374                         return ret;
 375                 }
 376         }
 377         return 0;
 378 }
 379
 380 static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
 381                                unsigned int node_id, unsigned int port)
 382 {
 383         struct qrtr_node *local_node;
 384         struct qrtr_lookup *lookup;
 385         struct qrtr_ctrl_pkt pkt;
 386         struct msghdr msg = { };
 387         struct qrtr_server *srv;
 388         struct sockaddr_qrtr sq;
 389         struct qrtr_node *node;
 390         struct list_head *tmp;
 391         struct list_head *li;
 392         unsigned long index;
 393         struct kvec iv;
 394         int ret;
 395
 396         iv.iov_base = &pkt;
 397         iv.iov_len = sizeof(pkt);
 398
 399         /* Don't accept spoofed messages */
 400         if (from->sq_node != node_id)
 401                 return -EINVAL;
 402
 403         /* Local DEL_CLIENT messages comes from the port being closed */
 404         if (from->sq_node == qrtr_ns.local_node && from->sq_port != port)
 405                 return -EINVAL;
 406
 407         /* Remove any lookups by this client */
 408         list_for_each_safe(li, tmp, &qrtr_ns.lookups) {
 409                 lookup = container_of(li, struct qrtr_lookup, li);
 410                 if (lookup->sq.sq_node != node_id)
 411                         continue;
 412                 if (lookup->sq.sq_port != port)
 413                         continue;
 414
 415                 list_del(&lookup->li);
 416                 kfree(lookup);
 417         }
 418
 419         /* Remove the server belonging to this port but don't broadcast
 420          * DEL_SERVER. Neighbours would've already removed the server belonging
 421          * to this port due to the DEL_CLIENT broadcast from qrtr_port_remove().
 422          */
 423         node = node_get(node_id);
 424         if (node)
 425                 server_del(node, port, false);
 426
 427         /* Advertise the removal of this client to all local servers */
 428         local_node = node_get(qrtr_ns.local_node);
 429         if (!local_node)
 430                 return 0;
 431
 432         memset(&pkt, 0, sizeof(pkt));
 433         pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
 434         pkt.client.node = cpu_to_le32(node_id);
 435         pkt.client.port = cpu_to_le32(port);
 436
 437         xa_for_each(&local_node->servers, index, srv) {
 438                 sq.sq_family = AF_QIPCRTR;
 439                 sq.sq_node = srv->node;
 440                 sq.sq_port = srv->port;
 441
 442                 msg.msg_name = (struct sockaddr *)&sq;
 443                 msg.msg_namelen = sizeof(sq);
 444
 445                 ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
 446                 if (ret < 0) {
 447                         pr_err("failed to send del client cmd\n");
 448                         return ret;
 449                 }
 450         }
 451         return 0;
 452 }
 453
 454 static int ctrl_cmd_new_server(struct sockaddr_qrtr *from,
 455                                unsigned int service, unsigned int instance,
 456                                unsigned int node_id, unsigned int port)
 457 {
 458         struct qrtr_lookup *lookup;
 459         struct qrtr_server *srv;
 460         struct list_head *li;
 461         int ret = 0;
 462
 463         /* Ignore specified node and port for local servers */
 464         if (from->sq_node == qrtr_ns.local_node) {
 465                 node_id = from->sq_node;
 466                 port = from->sq_port;
 467         }
 468
 469         srv = server_add(service, instance, node_id, port);
 470         if (!srv)
 471                 return -EINVAL;
 472
 473         if (srv->node == qrtr_ns.local_node) {
 474                 ret = service_announce_new(&qrtr_ns.bcast_sq, srv);
 475                 if (ret < 0) {
 476                         pr_err("failed to announce new service\n");
 477                         return ret;
 478                 }
 479         }
 480
 481         /* Notify any potential lookups about the new server */
 482         list_for_each(li, &qrtr_ns.lookups) {
 483                 lookup = container_of(li, struct qrtr_lookup, li);
 484                 if (lookup->service && lookup->service != service)
 485                         continue;
 486                 if (lookup->instance && lookup->instance != instance)
 487                         continue;
 488
 489                 lookup_notify(&lookup->sq, srv, true);
 490         }
 491
 492         return ret;
 493 }
 494
 495 static int ctrl_cmd_del_server(struct sockaddr_qrtr *from,
 496                                unsigned int service, unsigned int instance,
 497                                unsigned int node_id, unsigned int port)
 498 {
 499         struct qrtr_node *node;
 500
 501         /* Ignore specified node and port for local servers*/
 502         if (from->sq_node == qrtr_ns.local_node) {
 503                 node_id = from->sq_node;
 504                 port = from->sq_port;
 505         }
 506
 507         /* Local servers may only unregister themselves */
 508         if (from->sq_node == qrtr_ns.local_node && from->sq_port != port)
 509                 return -EINVAL;
 510
 511         node = node_get(node_id);
 512         if (!node)
 513                 return -ENOENT;
 514
 515         server_del(node, port, true);
 516
 517         return 0;
 518 }
 519
 520 static int ctrl_cmd_new_lookup(struct sockaddr_qrtr *from,
 521                                unsigned int service, unsigned int instance)
 522 {
 523         struct qrtr_server_filter filter;
 524         struct qrtr_lookup *lookup;
 525         struct qrtr_server *srv;
 526         struct qrtr_node *node;
 527         unsigned long node_idx;
 528         unsigned long srv_idx;
 529
 530         /* Accept only local observers */
 531         if (from->sq_node != qrtr_ns.local_node)
 532                 return -EINVAL;
 533
 534         lookup = kzalloc(sizeof(*lookup), GFP_KERNEL);
 535         if (!lookup)
 536                 return -ENOMEM;
 537
 538         lookup->sq = *from;
 539         lookup->service = service;
 540         lookup->instance = instance;
 541         list_add_tail(&lookup->li, &qrtr_ns.lookups);
 542
 543         memset(&filter, 0, sizeof(filter));
 544         filter.service = service;
 545         filter.instance = instance;
 546
 547         xa_for_each(&nodes, node_idx, node) {
 548                 xa_for_each(&node->servers, srv_idx, srv) {
 549                         if (!server_match(srv, &filter))
 550                                 continue;
 551
 552                         lookup_notify(from, srv, true);
 553                 }
 554         }
 555
 556         /* Empty notification, to indicate end of listing */
 557         lookup_notify(from, NULL, true);
 558
 559         return 0;
 560 }
 561
 562 static void ctrl_cmd_del_lookup(struct sockaddr_qrtr *from,
 563                                 unsigned int service, unsigned int instance)
 564 {
 565         struct qrtr_lookup *lookup;
 566         struct list_head *tmp;
 567         struct list_head *li;
 568
 569         list_for_each_safe(li, tmp, &qrtr_ns.lookups) {
 570                 lookup = container_of(li, struct qrtr_lookup, li);
 571                 if (lookup->sq.sq_node != from->sq_node)
 572                         continue;
 573                 if (lookup->sq.sq_port != from->sq_port)
 574                         continue;
 575                 if (lookup->service != service)
 576                         continue;
 577                 if (lookup->instance && lookup->instance != instance)
 578                         continue;
 579
 580                 list_del(&lookup->li);
 581                 kfree(lookup);
 582         }
 583 }
 584
 585 static void qrtr_ns_worker(struct work_struct *work)
 586 {
 587         const struct qrtr_ctrl_pkt *pkt;
 588         size_t recv_buf_size = 4096;
 589         struct sockaddr_qrtr sq;
 590         struct msghdr msg = { };
 591         unsigned int cmd;
 592         ssize_t msglen;
 593         void *recv_buf;
 594         struct kvec iv;
 595         int ret;
 596
 597         msg.msg_name = (struct sockaddr *)&sq;
 598         msg.msg_namelen = sizeof(sq);
 599
 600         recv_buf = kzalloc(recv_buf_size, GFP_KERNEL);
 601         if (!recv_buf)
 602                 return;
 603
 604         for (;;) {
 605                 iv.iov_base = recv_buf;
 606                 iv.iov_len = recv_buf_size;
 607
 608                 msglen = kernel_recvmsg(qrtr_ns.sock, &msg, &iv, 1,
 609                                         iv.iov_len, MSG_DONTWAIT);
 610
 611                 if (msglen == -EAGAIN)
 612                         break;
 613
 614                 if (msglen < 0) {
 615                         pr_err("error receiving packet: %zd\n", msglen);
 616                         break;
 617                 }
 618
 619                 pkt = recv_buf;
 620                 cmd = le32_to_cpu(pkt->cmd);
 621                 if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) &&
 622                     qrtr_ctrl_pkt_strings[cmd])
 623                         trace_qrtr_ns_message(qrtr_ctrl_pkt_strings[cmd],
 624                                               sq.sq_node, sq.sq_port);
 625
 626                 ret = 0;
 627                 switch (cmd) {
 628                 case QRTR_TYPE_HELLO:
 629                         ret = ctrl_cmd_hello(&sq);
 630                         break;
 631                 case QRTR_TYPE_BYE:
 632                         ret = ctrl_cmd_bye(&sq);
 633                         break;
 634                 case QRTR_TYPE_DEL_CLIENT:
 635                         ret = ctrl_cmd_del_client(&sq,
 636                                         le32_to_cpu(pkt->client.node),
 637                                         le32_to_cpu(pkt->client.port));
 638                         break;
 639                 case QRTR_TYPE_NEW_SERVER:
 640                         ret = ctrl_cmd_new_server(&sq,
 641                                         le32_to_cpu(pkt->server.service),
 642                                         le32_to_cpu(pkt->server.instance),
 643                                         le32_to_cpu(pkt->server.node),
 644                                         le32_to_cpu(pkt->server.port));
 645                         break;
 646                 case QRTR_TYPE_DEL_SERVER:
 647                         ret = ctrl_cmd_del_server(&sq,
 648                                          le32_to_cpu(pkt->server.service),
 649                                          le32_to_cpu(pkt->server.instance),
 650                                          le32_to_cpu(pkt->server.node),
 651                                          le32_to_cpu(pkt->server.port));
 652                         break;
 653                 case QRTR_TYPE_EXIT:
 654                 case QRTR_TYPE_PING:
 655                 case QRTR_TYPE_RESUME_TX:
 656                         break;
 657                 case QRTR_TYPE_NEW_LOOKUP:
 658                         ret = ctrl_cmd_new_lookup(&sq,
 659                                          le32_to_cpu(pkt->server.service),
 660                                          le32_to_cpu(pkt->server.instance));
 661                         break;
 662                 case QRTR_TYPE_DEL_LOOKUP:
 663                         ctrl_cmd_del_lookup(&sq,
 664                                     le32_to_cpu(pkt->server.service),
 665                                     le32_to_cpu(pkt->server.instance));
 666                         break;
 667                 }
 668
 669                 if (ret < 0)
 670                         pr_err("failed while handling packet from %d:%d",
 671                                sq.sq_node, sq.sq_port);
 672         }
 673
 674         kfree(recv_buf);
 675 }
 676
 677 static void qrtr_ns_data_ready(struct sock *sk)
 678 {
 679         trace_sk_data_ready(sk);
 680
 681         queue_work(qrtr_ns.workqueue, &qrtr_ns.work);
 682 }
 683
 684 int qrtr_ns_init(void)
 685 {
 686         struct sockaddr_qrtr sq;
 687         int ret;
 688
 689         INIT_LIST_HEAD(&qrtr_ns.lookups);
 690         INIT_WORK(&qrtr_ns.work, qrtr_ns_worker);
 691
 692         ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
 693                                PF_QIPCRTR, &qrtr_ns.sock);
 694         if (ret < 0)
 695                 return ret;
 696
 697         ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq);
 698         if (ret < 0) {
 699                 pr_err("failed to get socket name\n");
 700                 goto err_sock;
 701         }
 702
 703         qrtr_ns.workqueue = alloc_ordered_workqueue("qrtr_ns_handler", 0);
 704         if (!qrtr_ns.workqueue) {
 705                 ret = -ENOMEM;
 706                 goto err_sock;
 707         }
 708
 709         qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;
 710
 711         sq.sq_port = QRTR_PORT_CTRL;
 712         qrtr_ns.local_node = sq.sq_node;
 713
 714         ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
 715         if (ret < 0) {
 716                 pr_err("failed to bind to socket\n");
 717                 goto err_wq;
 718         }
 719
 720         qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
 721         qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
 722         qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;
 723
 724         ret = say_hello(&qrtr_ns.bcast_sq);
 725         if (ret < 0)
 726                 goto err_wq;
 727
 728         return 0;
 729
 730 err_wq:
 731         destroy_workqueue(qrtr_ns.workqueue);
 732 err_sock:
 733         sock_release(qrtr_ns.sock);
 734         return ret;
 735 }
 736 EXPORT_SYMBOL_GPL(qrtr_ns_init);
 737
 738 void qrtr_ns_remove(void)
 739 {
 740         cancel_work_sync(&qrtr_ns.work);
 741         destroy_workqueue(qrtr_ns.workqueue);
 742         sock_release(qrtr_ns.sock);
 743 }
 744 EXPORT_SYMBOL_GPL(qrtr_ns_remove);
 745
 746 MODULE_AUTHOR("Manivannan Sadhasivam <[email protected]>");
 747 MODULE_DESCRIPTION("Qualcomm IPC Router Nameservice");
 748 MODULE_LICENSE("Dual BSD/GPL");