sctp_eNB_task.c 29.4 KB
Newer Older
1
/*******************************************************************************
gauthier's avatar
GPLv3  
gauthier committed
2 3
    OpenAirInterface
    Copyright(c) 1999 - 2014 Eurecom
4

gauthier's avatar
GPLv3  
gauthier committed
5 6 7 8
    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
9 10


gauthier's avatar
GPLv3  
gauthier committed
11 12 13 14
    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
15

gauthier's avatar
GPLv3  
gauthier committed
16 17 18 19
    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is
   included in this distribution in the file called "COPYING". If not,
   see <http://www.gnu.org/licenses/>.
20 21

  Contact Information
gauthier's avatar
GPLv3  
gauthier committed
22 23 24 25 26
  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr

  Address      : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.
27

gauthier's avatar
GPLv3  
gauthier committed
28
 *******************************************************************************/
29 30 31 32 33 34 35 36

#include <pthread.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>

#include <sys/types.h>
#include <sys/socket.h>
gauthier's avatar
gauthier committed
37 38 39 40 41
#include <netdb.h>
#include <arpa/inet.h>
#include <ifaddrs.h>
#include <sys/ioctl.h>
#include <net/if.h>
42 43 44 45 46 47 48 49 50 51 52

#include <netinet/in.h>
#include <netinet/sctp.h>

#include <arpa/inet.h>

#include "assertions.h"
#include "queue.h"

#include "intertask_interface.h"

53
#include "sctp_default_values.h"
54 55 56
#include "sctp_common.h"
#include "sctp_eNB_itti_messaging.h"

57 58 59 60 61 62 63 64 65
/* Used to format an uint32_t containing an ipv4 address */
#define IPV4_ADDR    "%u.%u.%u.%u"
#define IPV4_ADDR_FORMAT(aDDRESS)               \
    (uint8_t)((aDDRESS)  & 0x000000ff),         \
    (uint8_t)(((aDDRESS) & 0x0000ff00) >> 8 ),  \
    (uint8_t)(((aDDRESS) & 0x00ff0000) >> 16),  \
    (uint8_t)(((aDDRESS) & 0xff000000) >> 24)


66 67 68 69 70 71
enum sctp_connection_type_e {
    SCTP_TYPE_CLIENT,
    SCTP_TYPE_SERVER,
    SCTP_TYPE_MAX
};

72
typedef struct sctp_cnx_list_elm_s {
73 74
    STAILQ_ENTRY(sctp_cnx_list_elm_s) entries;

75 76 77 78
    /* Type of this association
     */
    enum sctp_connection_type_e connection_type;

79 80 81 82 83
    int        sd;              ///< Socket descriptor of connection */
    uint16_t   local_port;
    uint16_t   in_streams;      ///< Number of input streams negociated for this connection
    uint16_t   out_streams;     ///< Number of output streams negotiated for this connection
    uint16_t   ppid;            ///< Payload protocol Identifier
84
    int32_t    assoc_id;        ///< SCTP association id for the connection     (note4debug host byte order)
85 86 87 88 89
    uint32_t   messages_recv;   ///< Number of messages received on this connection
    uint32_t   messages_sent;   ///< Number of messages sent on this connection
    task_id_t  task_id;         ///< Task id of the task who asked for this connection
    instance_t instance;        ///< Instance
    uint16_t   cnx_id;          ///< Upper layer identifier
90

91 92 93
    struct   sockaddr *peer_addresses;///< A list of peer addresses for server socket
    int      nb_peer_addresses; ///< For server socket
} sctp_cnx_list_elm_t;
94 95 96 97 98


static STAILQ_HEAD(sctp_cnx_list_head, sctp_cnx_list_elm_s) sctp_cnx_list;
static uint16_t sctp_nb_cnx = 0;

99

gauthier's avatar
gauthier committed
100
struct sctp_cnx_list_elm_s *sctp_get_cnx(int32_t assoc_id, int sd) {
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
    struct sctp_cnx_list_elm_s *elm;

    STAILQ_FOREACH(elm, &sctp_cnx_list, entries)
    {
        if (assoc_id != -1) {
            if (elm->assoc_id == assoc_id) {
                return elm;
            }
        } else {
            if (elm->sd == sd) {
                return elm;
            }
        }
    }

    return NULL;
}

gauthier's avatar
gauthier committed
119 120 121 122 123
void
sctp_handle_new_association_req(
                const instance_t instance,
                const task_id_t requestor,
                const sctp_new_association_req_t * const sctp_new_association_req_p)
124
{
gauthier's avatar
gauthier committed
125 126
    int                           sd;
    int32_t                       assoc_id;
127

gauthier's avatar
gauthier committed
128
    struct sctp_event_subscribe   events;
129

gauthier's avatar
gauthier committed
130 131
    struct sctp_cnx_list_elm_s   *sctp_cnx = NULL;
    enum sctp_connection_type_e   connection_type = SCTP_TYPE_CLIENT;
132

gauthier's avatar
gauthier committed
133 134 135 136 137
    struct ifreq                  ifr;
    struct ifaddrs               *ifaddr, *ifa;
    int                           family, s;
    struct in_addr                in;
    struct in6_addr               in6;
138 139 140 141 142 143
    /* Prepare a new SCTP association as requested by upper layer and try to connect
     * to remote host.
     */
    DevAssert(sctp_new_association_req_p != NULL);

    /* Create new socket with IPv6 affinity */
144 145 146 147 148
#ifdef NO_VIRTUAL_MACHINE
    // in init chunk appears a list of host addresses, IPv4 and IPv4 in an arbitrary (unsorted) order
    // SCTP hearbeats starts with first ipv4 addresses then stop triyng with other ipv4 addresses
    // if it encounters an IPv6 address in list, so we can force the building of IPv4 addresses only
    // with AF_INET (of cource the working IPv4 address is the last in the list...)
149
    if ((sd = socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP)) < 0) {
150 151 152
#else
    if ((sd = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP)) < 0) {
#endif
153 154 155 156 157 158 159
        SCTP_ERROR("Socket creation failed: %s\n", strerror(errno));
        return;
    }

    /* Add the socket to list of fd monitored by ITTI */
    itti_subscribe_event_fd(TASK_SCTP, sd);

160 161 162
    if (sctp_set_init_opt(sd, SCTP_IN_STREAMS, SCTP_OUT_STREAMS,
        SCTP_MAX_ATTEMPTS, SCTP_TIMEOUT) != 0)
    {
163 164
        SCTP_ERROR("Setsockopt IPPROTO_SCTP_INITMSG failed: %s\n",
                   strerror(errno));
165
        itti_unsubscribe_event_fd(TASK_SCTP, sd);
166
        close(sd);
167 168 169 170 171 172 173 174 175
        return;
    }

    /* Subscribe to all events */
    memset((void *)&events, 1, sizeof(struct sctp_event_subscribe));
    if (setsockopt(sd, IPPROTO_SCTP, SCTP_EVENTS, &events,
                   sizeof(struct sctp_event_subscribe)) < 0) {
        SCTP_ERROR("Setsockopt IPPROTO_SCTP_EVENTS failed: %s\n",
                   strerror(errno));
176 177 178 179
        close(sd);
        return;
    }

gauthier's avatar
gauthier committed
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200
    // Bind to device ... or we could bind to address also
    if (getifaddrs(&ifaddr) == -1) {
        SCTP_ERROR("getifaddrs failed: %s\n", strerror(errno));
        close(sd);
    }
    /* Walk through linked list, maintaining head pointer so we
       can free list later */
    for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
        if (ifa->ifa_addr == NULL)
            continue;

        family = ifa->ifa_addr->sa_family;

        /* For an AF_INET* interface address, display the address */
        if (sctp_new_association_req_p->local_address.ipv4 && family == AF_INET) {
            // compare address
            s = inet_aton(sctp_new_association_req_p->local_address.ipv4_address,
                    &in);
            if (s > 0 ) {
                if (((struct sockaddr_in*)ifa->ifa_addr)->sin_addr.s_addr == in.s_addr) {
                    memset(&ifr, 0, sizeof(ifr));
201
                    snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s",ifa->ifa_name);
gauthier's avatar
gauthier committed
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220
                    if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr)) < 0) {
                        SCTP_ERROR("Setsockopt SOL_SOCKET failed: %s\n",
                                   strerror(errno));
                    } else {
                        SCTP_DEBUG("Setsockopt SOL_SOCKET socket bound to : %s\n",
                                ifa->ifa_name);
                    }
                    break;
                }
            }
        } else if (sctp_new_association_req_p->local_address.ipv6 && family == AF_INET6) {
            // compare address
            s = inet_pton(AF_INET6,
                    sctp_new_association_req_p->local_address.ipv6_address,
                    &in6);
            if (s == 1 ) {
                if (memcmp(&((struct sockaddr_in6*)ifa->ifa_addr)->sin6_addr,
                        &in6, sizeof(in6)) == 0) {
                    memset(&ifr, 0, sizeof(ifr));
221
                    snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", ifa->ifa_name);
gauthier's avatar
gauthier committed
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236
                    if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr)) < 0) {
                        SCTP_ERROR("Setsockopt SOL_SOCKET failed: %s\n",
                                   strerror(errno));
                    } else {
                        SCTP_DEBUG("Setsockopt SOL_SOCKET socket bound to : %s\n",
                                ifa->ifa_name);
                    }
                    break;
                }
            }
        }
    }

    freeifaddrs(ifaddr);

237 238 239 240 241
    /* Mark the socket as non-blocking */
    if (fcntl(sd, F_SETFL, O_NONBLOCK) < 0) {
        SCTP_ERROR("fcntl F_SETFL O_NONBLOCK failed: %s\n",
                   strerror(errno));
        close(sd);
242 243 244 245 246 247 248
        return;
    }

    /* SOCK_STREAM socket type requires an explicit connect to the remote host
     * address and port.
     * Only use IPv4 for the first connection attempt
     */
249 250
    if ((sctp_new_association_req_p->remote_address.ipv6 != 0) ||
        (sctp_new_association_req_p->remote_address.ipv4 != 0))
251 252 253 254 255 256 257 258 259 260 261 262 263 264 265
    {
        uint8_t address_index = 0;
        uint8_t used_address  = sctp_new_association_req_p->remote_address.ipv6 +
                                sctp_new_association_req_p->remote_address.ipv4;
        struct sockaddr_in addr[used_address];

        memset(addr, 0, used_address * sizeof(struct sockaddr_in));

        if (sctp_new_association_req_p->remote_address.ipv6 == 1) {
            if (inet_pton(AF_INET6, sctp_new_association_req_p->remote_address.ipv6_address,
                &addr[address_index].sin_addr.s_addr) != 1)
            {
                SCTP_ERROR("Failed to convert ipv6 address %*s to network type\n",
                           strlen(sctp_new_association_req_p->remote_address.ipv6_address),
                           sctp_new_association_req_p->remote_address.ipv6_address);
266
                close(sd);
267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
                return;
            }

            SCTP_DEBUG("Converted ipv6 address %*s to network type\n",
                       strlen(sctp_new_association_req_p->remote_address.ipv6_address),
                       sctp_new_association_req_p->remote_address.ipv6_address);

            addr[address_index].sin_family = AF_INET6;
            addr[address_index].sin_port   = htons(sctp_new_association_req_p->port);
            address_index++;
        }
        if (sctp_new_association_req_p->remote_address.ipv4 == 1) {
            if (inet_pton(AF_INET, sctp_new_association_req_p->remote_address.ipv4_address,
                &addr[address_index].sin_addr.s_addr) != 1)
            {
                SCTP_ERROR("Failed to convert ipv4 address %*s to network type\n",
                           strlen(sctp_new_association_req_p->remote_address.ipv4_address),
                           sctp_new_association_req_p->remote_address.ipv4_address);
285
                close(sd);
286 287 288 289 290 291 292 293 294 295 296 297 298
                return;
            }

            SCTP_DEBUG("Converted ipv4 address %*s to network type\n",
                       strlen(sctp_new_association_req_p->remote_address.ipv4_address),
                       sctp_new_association_req_p->remote_address.ipv4_address);

            addr[address_index].sin_family = AF_INET;
            addr[address_index].sin_port   = htons(sctp_new_association_req_p->port);
            address_index++;
        }

        /* Connect to remote host and port */
299 300 301 302 303 304 305 306
        if (sctp_connectx(sd, (struct sockaddr *)addr, used_address, &assoc_id) < 0)
        {
            /* sctp_connectx on non-blocking socket return EINPROGRESS */
            if (errno != EINPROGRESS) {
                SCTP_ERROR("Connect failed: %s\n", strerror(errno));
                sctp_itti_send_association_resp(
                    requestor, instance, -1, sctp_new_association_req_p->ulp_cnx_id,
                    SCTP_STATE_UNREACHABLE, 0, 0);
307 308
                /* Add the socket to list of fd monitored by ITTI */
                itti_unsubscribe_event_fd(TASK_SCTP, sd);
309 310
                close(sd);
                return;
311
            } else {
312
                SCTP_DEBUG("connectx assoc_id  %d in progress..., used %d addresses\n",
313
                           assoc_id, used_address);
314
            }
315 316 317 318
        } else {
            SCTP_DEBUG("sctp_connectx SUCCESS, used %d addresses assoc_id %d\n",
                       used_address,
                       assoc_id);
319
        }
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338
    } else {
        /* No remote address provided -> only bind the socket for now.
         * Connection will be accepted in the main event loop
         */
        struct sockaddr_in6 addr6;

        connection_type = SCTP_TYPE_SERVER;

        /* For now bind to any interface */
        addr6.sin6_family = AF_INET6;
        addr6.sin6_addr = in6addr_any;
        addr6.sin6_port = htons(sctp_new_association_req_p->port);

        if (bind(sd, (struct sockaddr*)&addr6, sizeof(addr6)) < 0) {
            SCTP_ERROR("Failed to bind the socket %d to address any (v4/v6): %s\n",
                       strerror(errno));
            close(sd);
            return;
        }
339 340
    }

341
    sctp_cnx = calloc(1, sizeof(*sctp_cnx));
342

343 344
    sctp_cnx->connection_type = connection_type;

345 346 347 348 349
    sctp_cnx->sd       = sd;
    sctp_cnx->task_id  = requestor;
    sctp_cnx->cnx_id   = sctp_new_association_req_p->ulp_cnx_id;
    sctp_cnx->ppid     = sctp_new_association_req_p->ppid;
    sctp_cnx->instance = instance;
350
    sctp_cnx->assoc_id = assoc_id;
351

352 353 354
    /* Insert new element at end of list */
    STAILQ_INSERT_TAIL(&sctp_cnx_list, sctp_cnx, entries);
    sctp_nb_cnx++;
355

356 357
    SCTP_DEBUG("Inserted new descriptor for sd %d in list, nb elements %u, assoc_id %d\n",
                sd, sctp_nb_cnx, assoc_id);
358 359
}

360
void sctp_send_data(
gauthier's avatar
gauthier committed
361 362 363
                instance_t       instance,
                task_id_t        task_id,
                sctp_data_req_t *sctp_data_req_p)
364 365 366 367
{
    struct sctp_cnx_list_elm_s *sctp_cnx = NULL;

    DevAssert(sctp_data_req_p != NULL);
gauthier's avatar
gauthier committed
368 369
    DevAssert(sctp_data_req_p->buffer != NULL);
    DevAssert(sctp_data_req_p->buffer_length > 0);
370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392

    sctp_cnx = sctp_get_cnx(sctp_data_req_p->assoc_id, 0);

    if (sctp_cnx == NULL) {
        SCTP_ERROR("Failed to find SCTP description for assoc_id %d\n",
                   sctp_data_req_p->assoc_id);
        /* TODO: notify upper layer */
        return;
    }

    if (sctp_data_req_p->stream >= sctp_cnx->out_streams) {
        SCTP_ERROR("Requested stream (%u) >= nb out streams\n",
                   sctp_data_req_p->stream, sctp_cnx->out_streams);
        return;
    }

    /* Send message on specified stream of the sd association
     * NOTE: PPID should be defined in network order
     */
    if (sctp_sendmsg(sctp_cnx->sd, sctp_data_req_p->buffer,
                     sctp_data_req_p->buffer_length, NULL, 0,
                     htonl(sctp_cnx->ppid), 0, sctp_data_req_p->stream, 0, 0) < 0) {
        SCTP_ERROR("Sctp_sendmsg failed: %s\n", strerror(errno));
393
        /* TODO: notify upper layer */
394 395 396 397 398 399 400 401
        return;
    }

    SCTP_DEBUG("Successfully sent %u bytes on stream %d for assoc_id %u\n",
               sctp_data_req_p->buffer_length, sctp_data_req_p->stream,
               sctp_cnx->assoc_id);
}

gauthier's avatar
gauthier committed
402
static int sctp_close_association(
gauthier's avatar
gauthier committed
403 404 405
                const instance_t instance,
                const task_id_t  requestor,
                sctp_close_association_t     *close_association_p)
gauthier's avatar
gauthier committed
406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426
{

    struct sctp_cnx_list_elm_s *sctp_cnx = NULL;

    DevAssert(close_association_p != NULL);
    sctp_cnx = sctp_get_cnx(close_association_p->assoc_id, 0);

    if (sctp_cnx == NULL) {
        SCTP_ERROR("Failed to find SCTP description for assoc_id %d\n",
            close_association_p->assoc_id);
        /* TODO: notify upper layer */
        return -1;
    } else {
        close(sctp_cnx->sd);
        STAILQ_REMOVE(&sctp_cnx_list, sctp_cnx, sctp_cnx_list_elm_s, entries);
        SCTP_DEBUG("Removed assoc_id %u (closed socket %u)\n",
                   sctp_cnx->assoc_id, sctp_cnx->sd);
    }
    return 0;
}

427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509
static int sctp_create_new_listener(
		const instance_t instance,
	    const task_id_t  requestor,
	    sctp_init_t     *init_p)
{
    struct sctp_event_subscribe   event;
    struct sockaddr              *addr      = NULL;
    struct sctp_cnx_list_elm_s   *sctp_cnx  = NULL;
    uint16_t                      i  = 0, j = 0;
    int                           sd = 0;
    int                           used_addresses = 0;

    DevAssert(init_p != NULL);

    if (init_p->ipv4 == 0 && init_p->ipv6 == 0) {
        SCTP_ERROR("Illegal IP configuration upper layer should request at"
                   "least ipv4 and/or ipv6 config\n");
        return -1;
    }

    if ((used_addresses = init_p->nb_ipv4_addr + init_p->nb_ipv6_addr) == 0) {
        SCTP_WARN("No address provided...\n");
        return -1;
    }

    addr = calloc(used_addresses, sizeof(struct sockaddr));

    SCTP_DEBUG("Creating new listen socket on port %u with\n", init_p->port);
    if (init_p->ipv4 == 1) {
        struct sockaddr_in *ip4_addr;

        SCTP_DEBUG("ipv4 addresses:\n");
        for (i = 0; i < init_p->nb_ipv4_addr; i++) {
            SCTP_DEBUG("\t- "IPV4_ADDR"\n",
                       IPV4_ADDR_FORMAT(init_p->ipv4_address[i]));
            ip4_addr = (struct sockaddr_in *)&addr[i];
            ip4_addr->sin_family = AF_INET;
            ip4_addr->sin_port   = htons(init_p->port);
            ip4_addr->sin_addr.s_addr = init_p->ipv4_address[i];
        }
    }
    if (init_p->ipv6 == 1) {
        struct sockaddr_in6 *ip6_addr;

        SCTP_DEBUG("ipv6 addresses:\n");
        for (j = 0; j < init_p->nb_ipv6_addr; j++) {
            SCTP_DEBUG("\t- %s\n", init_p->ipv6_address[j]);
            ip6_addr = (struct sockaddr_in6 *)&addr[i + j];
            ip6_addr->sin6_family = AF_INET6;
            ip6_addr->sin6_port  = htons(init_p->port);
            if (inet_pton(AF_INET6, init_p->ipv6_address[j],
                          ip6_addr->sin6_addr.s6_addr) <= 0) {
                SCTP_WARN("Provided ipv6 address %s is not valid\n",
                             init_p->ipv6_address[j]);
            }
        }
    }

    if ((sd = socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP)) < 0) {
        SCTP_ERROR("socket: %s:%d\n", strerror(errno), errno);
        return -1;
    }

    memset((void *)&event, 1, sizeof(struct sctp_event_subscribe));
    if (setsockopt(sd, IPPROTO_SCTP, SCTP_EVENTS, &event,
                   sizeof(struct sctp_event_subscribe)) < 0) {
        SCTP_ERROR("setsockopt: %s:%d\n", strerror(errno), errno);
        return -1;
    }

    sctp_cnx = calloc(1, sizeof(*sctp_cnx));

    sctp_cnx->connection_type = SCTP_TYPE_SERVER;
    sctp_cnx->sd              = sd;
    sctp_cnx->local_port      = init_p->port;
    sctp_cnx->in_streams      = 32;
    sctp_cnx->out_streams     = 32;
    sctp_cnx->ppid            = init_p->ppid;
    sctp_cnx->task_id         = requestor;
    sctp_cnx->instance        = instance;

    /* Some pre-bind socket configuration */
    if (sctp_set_init_opt(sd,
gauthier's avatar
gauthier committed
510 511 512 513
                          sctp_cnx->in_streams,
                          sctp_cnx->out_streams,
                          0,
                          0) < 0) {
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541
        goto err;
    }

    if (sctp_bindx(sd, addr, used_addresses, SCTP_BINDX_ADD_ADDR) != 0) {
        SCTP_ERROR("sctp_bindx: %s:%d\n", strerror(errno), errno);
        return -1;
    }
    if (listen(sd, 5) < 0) {
        SCTP_ERROR("listen: %s:%d\n", strerror(errno), errno);
        return -1;
    }

    /* Insert new element at end of list */
    STAILQ_INSERT_TAIL(&sctp_cnx_list, sctp_cnx, entries);
    sctp_nb_cnx++;

    /* Add the socket to list of fd monitored by ITTI */
    itti_subscribe_event_fd(TASK_SCTP, sd);

    return sd;
err:
    if (sd != -1) {
        close(sd);
        sd = -1;
    }
    return -1;
}

gauthier's avatar
gauthier committed
542 543 544 545
static inline
void
sctp_eNB_accept_associations(
                struct sctp_cnx_list_elm_s *sctp_cnx)
546
{
gauthier's avatar
gauthier committed
547
    int             client_sd;
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608
    struct sockaddr saddr;
    socklen_t       saddr_size;

    DevAssert(sctp_cnx != NULL);

    saddr_size = sizeof(saddr);

    /* There is a new client connecting. Accept it...
     */
    if ((client_sd = accept(sctp_cnx->sd, &saddr, &saddr_size)) < 0) {
        SCTP_ERROR("[%d] accept failed: %s:%d\n", sctp_cnx->sd, strerror(errno), errno);
    } else {
        struct sctp_cnx_list_elm_s *new_cnx;
        uint16_t port;

        /* This is an ipv6 socket */
        port = ((struct sockaddr_in6*)&saddr)->sin6_port;

        /* Contrary to BSD, client socket does not inherit O_NONBLOCK option */
        if (fcntl(client_sd, F_SETFL, O_NONBLOCK) < 0) {
            SCTP_ERROR("fcntl F_SETFL O_NONBLOCK failed: %s\n",
                       strerror(errno));
            close(client_sd);
            return;
        }

        new_cnx = calloc(1, sizeof(*sctp_cnx));

        DevAssert(new_cnx != NULL);

        new_cnx->connection_type = SCTP_TYPE_CLIENT;

        new_cnx->sd         = client_sd;
        new_cnx->task_id    = sctp_cnx->task_id;
        new_cnx->cnx_id     = 0;
        new_cnx->ppid       = sctp_cnx->ppid;
        new_cnx->instance   = sctp_cnx->instance;
        new_cnx->local_port = sctp_cnx->local_port;

        if (sctp_get_sockinfo(client_sd, &new_cnx->in_streams, &new_cnx->out_streams,
            &new_cnx->assoc_id) != 0)
        {
            SCTP_ERROR("sctp_get_sockinfo failed\n");
            close(client_sd);
            free(new_cnx);
            return;
        }

        /* Insert new element at end of list */
        STAILQ_INSERT_TAIL(&sctp_cnx_list, new_cnx, entries);
        sctp_nb_cnx++;

        /* Add the socket to list of fd monitored by ITTI */
        itti_subscribe_event_fd(TASK_SCTP, client_sd);

        sctp_itti_send_association_ind(new_cnx->task_id, new_cnx->instance,
                                       new_cnx->assoc_id, port,
                                       new_cnx->out_streams, new_cnx->in_streams);
    }
}

gauthier's avatar
gauthier committed
609 610 611 612
static inline
void
sctp_eNB_read_from_socket(
                struct sctp_cnx_list_elm_s *sctp_cnx)
613
{
614 615
    int                    flags = 0, n;
    socklen_t              from_len;
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
    struct sctp_sndrcvinfo sinfo;

    struct sockaddr_in addr;
    uint8_t buffer[SCTP_RECV_BUFFER_SIZE];

    DevAssert(sctp_cnx != NULL);

    memset((void *)&addr, 0, sizeof(struct sockaddr_in));
    from_len = (socklen_t)sizeof(struct sockaddr_in);
    memset((void *)&sinfo, 0, sizeof(struct sctp_sndrcvinfo));

    n = sctp_recvmsg(sctp_cnx->sd, (void *)buffer, SCTP_RECV_BUFFER_SIZE,
                     (struct sockaddr *)&addr, &from_len,
                     &sinfo, &flags);
    if (n < 0) {
631 632 633
        if (errno == ENOTCONN) {
            itti_unsubscribe_event_fd(TASK_SCTP, sctp_cnx->sd);

634 635
            SCTP_DEBUG("Received not connected for sd %d\n", sctp_cnx->sd);

636 637 638 639 640
            sctp_itti_send_association_resp(
                sctp_cnx->task_id, sctp_cnx->instance, -1,
                sctp_cnx->cnx_id, SCTP_STATE_UNREACHABLE, 0, 0);

            close(sctp_cnx->sd);
641
            STAILQ_REMOVE(&sctp_cnx_list, sctp_cnx, sctp_cnx_list_elm_s, entries);
642 643 644 645
            sctp_nb_cnx--;
            free(sctp_cnx);
        } else {
            SCTP_DEBUG("An error occured during read\n");
646
            SCTP_ERROR("sctp_recvmsg (fd %d, len %d ): %s:%d\n", sctp_cnx->sd, n, strerror(errno), errno);
647 648 649 650
        }
        return;
    } else if (n == 0) {
        SCTP_DEBUG("return of sctp_recvmsg is 0...\n");
651 652 653 654 655 656
        return;
    }
    if (flags & MSG_NOTIFICATION) {
        union sctp_notification *snp;
        snp = (union sctp_notification *)buffer;

657 658 659
        SCTP_DEBUG("Received notification for sd %d, type %u\n",
                   sctp_cnx->sd, snp->sn_header.sn_type);

660 661 662
        /* Client deconnection */
        if (SCTP_SHUTDOWN_EVENT == snp->sn_header.sn_type) {
            itti_unsubscribe_event_fd(TASK_SCTP, sctp_cnx->sd);
663 664 665 666 667 668 669 670 671 672 673 674

            close(sctp_cnx->sd);

            sctp_itti_send_association_resp(
                sctp_cnx->task_id, sctp_cnx->instance, sctp_cnx->assoc_id,
                sctp_cnx->cnx_id, SCTP_STATE_SHUTDOWN,
                0, 0);

            STAILQ_REMOVE(&sctp_cnx_list, sctp_cnx, sctp_cnx_list_elm_s, entries);
            sctp_nb_cnx--;

            free(sctp_cnx);
675 676 677 678 679 680 681 682 683 684 685
        }
        /* Association has changed. */
        else if (SCTP_ASSOC_CHANGE == snp->sn_header.sn_type) {
            struct sctp_assoc_change *sctp_assoc_changed;
            sctp_assoc_changed = &snp->sn_assoc_change;

            SCTP_DEBUG("Client association changed: %d\n", sctp_assoc_changed->sac_state);

            /* New physical association requested by a peer */
            switch (sctp_assoc_changed->sac_state) {
                case SCTP_COMM_UP: {
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
                    if (sctp_get_peeraddresses(sctp_cnx->sd, NULL, NULL) != 0)
                    {
                        /* TODO Failure -> notify upper layer */
                    } else {
                        sctp_get_sockinfo(sctp_cnx->sd, &sctp_cnx->in_streams,
                                          &sctp_cnx->out_streams, &sctp_cnx->assoc_id);
                    }

                    SCTP_DEBUG("Comm up notified for sd %d, assigned assoc_id %d\n",
                               sctp_cnx->sd, sctp_cnx->assoc_id);

                    sctp_itti_send_association_resp(
                        sctp_cnx->task_id, sctp_cnx->instance, sctp_cnx->assoc_id,
                        sctp_cnx->cnx_id, SCTP_STATE_ESTABLISHED,
                        sctp_cnx->out_streams, sctp_cnx->in_streams);

702 703 704 705 706 707
                } break;
                default:
                    break;
            }
        }
    } else {
708
        sctp_cnx->messages_recv++;
709

710
        if (ntohl(sinfo.sinfo_ppid) != sctp_cnx->ppid) {
711 712 713 714
            /* Mismatch in Payload Protocol Identifier,
             * may be we received unsollicited traffic from stack other than S1AP.
             */
            SCTP_ERROR("Received data from peer with unsollicited PPID %d, expecting %d\n",
715 716
                       ntohl(sinfo.sinfo_ppid),
                       sctp_cnx->ppid);
717 718 719 720
        }

        SCTP_DEBUG("[%d][%d] Msg of length %d received from port %u, on stream %d, PPID %d\n",
                   sinfo.sinfo_assoc_id, sctp_cnx->sd, n, ntohs(addr.sin_port),
721
                   sinfo.sinfo_stream, ntohl(sinfo.sinfo_ppid));
722 723 724 725 726 727 728

        sctp_itti_send_new_message_ind(sctp_cnx->task_id,
                                       sinfo.sinfo_assoc_id,
                                       buffer, n, sinfo.sinfo_stream);
    }
}

gauthier's avatar
gauthier committed
729 730 731
void
sctp_eNB_flush_sockets(
                struct epoll_event *events, int nb_events)
732 733 734 735 736 737 738 739 740 741 742 743 744 745
{
    int i;
    struct sctp_cnx_list_elm_s *sctp_cnx = NULL;

    if (events == NULL) {
        return;
    }

    for (i = 0; i < nb_events; i++) {
        sctp_cnx = sctp_get_cnx(-1, events[i].data.fd);
        if (sctp_cnx == NULL) {
            continue;
        }
        SCTP_DEBUG("Found data for descriptor %d\n", events[i].data.fd);
746 747 748 749 750
        if (sctp_cnx->connection_type == SCTP_TYPE_CLIENT) {
            sctp_eNB_read_from_socket(sctp_cnx);
        } else {
            sctp_eNB_accept_associations(sctp_cnx);
        }
751 752 753
    }
}

754

755 756 757 758 759
void *sctp_eNB_task(void *arg)
{
    int                 nb_events;
    struct epoll_event *events;
    MessageDef         *received_msg = NULL;
760
    int                 result;
761 762 763 764 765 766 767 768 769 770 771 772

    SCTP_DEBUG("Starting SCTP layer\n");

    STAILQ_INIT(&sctp_cnx_list);

    itti_mark_task_ready(TASK_SCTP);

    while (1) {
        itti_receive_msg(TASK_SCTP, &received_msg);

        /* Check if there is a packet to handle */
        if (received_msg != NULL) {
773 774
            switch (ITTI_MSG_ID(received_msg))
            {
775 776 777 778
                case SCTP_INIT_MSG: {
                    SCTP_DEBUG("Received SCTP_INIT_MSG\n");
                    /* We received a new connection request */
                    if (sctp_create_new_listener(
779 780 781
                                    ITTI_MESSAGE_GET_INSTANCE(received_msg),
                                    ITTI_MSG_ORIGIN_ID(received_msg),
                                    &received_msg->ittiMsg.sctp_init) < 0) {
782 783 784 785 786
                        /* SCTP socket creation or bind failed... */
                        SCTP_ERROR("Failed to create new SCTP listener\n");
                    }
                } break;
                case SCTP_CLOSE_ASSOCIATION:
gauthier's avatar
gauthier committed
787
                    sctp_close_association(ITTI_MESSAGE_GET_INSTANCE(received_msg),
788 789
                                           ITTI_MSG_ORIGIN_ID(received_msg),
                                           &received_msg->ittiMsg.sctp_close_association);
gauthier's avatar
gauthier committed
790
                    break;
791

792 793 794
                case TERMINATE_MESSAGE:
                    itti_exit_task();
                    break;
795

796
                case SCTP_NEW_ASSOCIATION_REQ: {
797
                    sctp_handle_new_association_req(ITTI_MESSAGE_GET_INSTANCE(received_msg),
Cedric Roux's avatar
Cedric Roux committed
798
                                                    ITTI_MSG_ORIGIN_ID(received_msg),
799
                                                    &received_msg->ittiMsg.sctp_new_association_req);
800 801
                } break;
                case SCTP_DATA_REQ: {
802
                    sctp_send_data(ITTI_MESSAGE_GET_INSTANCE(received_msg),
Cedric Roux's avatar
Cedric Roux committed
803
                                   ITTI_MSG_ORIGIN_ID(received_msg),
804
                                   &received_msg->ittiMsg.sctp_data_req);
805 806
                } break;
                default:
807 808
                    SCTP_ERROR("Received unhandled message %d:%s\n",
                               ITTI_MSG_ID(received_msg), ITTI_MSG_NAME(received_msg));
809 810
                    break;
            }
811 812
            result = itti_free(ITTI_MSG_ORIGIN_ID(received_msg), received_msg);
            AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
813
            received_msg = NULL;
814 815 816 817 818 819 820 821
        }

        nb_events = itti_get_events(TASK_SCTP, &events);
        /* Now handle notifications for other sockets */
        sctp_eNB_flush_sockets(events, nb_events);
    }
    return NULL;
}