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open5gs/src/mme/s1ap-usrpath.c

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/*
* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ogs-sctp.h"
#include "mme-event.h"
#include "s1ap-path.h"
int s1ap_usrsctp_recv_handler(struct socket *sock,
union sctp_sockstore addr, void *data, size_t datalen,
struct sctp_rcvinfo rcv, int flags, void *ulp_info);
static ogs_sockaddr_t *usrsctp_remote_addr(union sctp_sockstore *store);
ogs_sock_t *s1ap_server(ogs_socknode_t *node)
{
char buf[OGS_ADDRSTRLEN];
ogs_sock_t *sock = NULL;
ogs_assert(node);
ogs_socknode_set_poll(node, mme_self()->pollset,
OGS_POLLIN, s1ap_usrsctp_recv_handler, node);
/* FIXME : libsctp 0.9.3.0 is not properly working in SOCK_STREAM */
sock = ogs_sctp_server(SOCK_SEQPACKET, node);
ogs_assert(sock);
ogs_info("s1ap_server() [%s]:%d",
OGS_ADDR(node->addr, buf), OGS_PORT(node->addr));
return sock;
}
void s1ap_recv_handler(short when, ogs_socket_t fd, void *data)
{
/* At this point, nextepc does not use SOCK_STREAM in libusrsctp */
ogs_assert_if_reached();
}
int s1ap_usrsctp_recv_handler(struct socket *sock,
union sctp_sockstore store, void *data, size_t datalen,
struct sctp_rcvinfo rcv, int flags, void *ulp_info)
{
if (data) {
int rv;
mme_event_t *e = NULL;
if (flags & MSG_NOTIFICATION) {
union sctp_notification *not = (union sctp_notification *)data;
if (not->sn_header.sn_length == (uint32_t)datalen) {
switch(not->sn_header.sn_type) {
case SCTP_ASSOC_CHANGE :
{
ogs_debug("SCTP_ASSOC_CHANGE:"
"[T:%d, F:0x%x, S:%d, I/O:%d/%d]",
not->sn_assoc_change.sac_type,
not->sn_assoc_change.sac_flags,
not->sn_assoc_change.sac_state,
not->sn_assoc_change.sac_inbound_streams,
not->sn_assoc_change.sac_outbound_streams);
if (not->sn_assoc_change.sac_state ==
SCTP_SHUTDOWN_COMP ||
not->sn_assoc_change.sac_state ==
SCTP_COMM_LOST) {
ogs_sockaddr_t *addr =
usrsctp_remote_addr(&store);
ogs_assert(addr);
if (not->sn_assoc_change.sac_state ==
SCTP_SHUTDOWN_COMP)
ogs_debug("SCTP_SHUTDOWN_COMP");
if (not->sn_assoc_change.sac_state ==
SCTP_COMM_LOST)
ogs_debug("SCTP_COMM_LOST");
e = mme_event_new(MME_EVT_S1AP_LO_CONNREFUSED);
ogs_assert(e);
e->enb_sock = (ogs_sock_t *)sock;
e->enb_addr = addr;
rv = ogs_queue_push(mme_self()->queue, e);
if (rv != OGS_OK) {
ogs_warn("ogs_queue_push() failed:%d", (int)rv);
ogs_free(e->enb_addr);
mme_event_free(e);
} else {
ogs_pollset_notify(mme_self()->pollset);
}
} else if (not->sn_assoc_change.sac_state == SCTP_COMM_UP) {
ogs_sockaddr_t *addr =
usrsctp_remote_addr(&store);
ogs_assert(addr);
ogs_debug("SCTP_COMM_UP");
e = mme_event_new(MME_EVT_S1AP_LO_SCTP_COMM_UP);
ogs_assert(e);
e->enb_sock = (ogs_sock_t *)sock;
e->enb_addr = addr;
e->inbound_streams =
not->sn_assoc_change.sac_inbound_streams;
e->outbound_streams =
not->sn_assoc_change.sac_outbound_streams;
rv = ogs_queue_push(mme_self()->queue, e);
if (rv != OGS_OK) {
ogs_warn("ogs_queue_push() failed:%d", (int)rv);
ogs_free(e->enb_addr);
mme_event_free(e);
} else {
ogs_pollset_notify(mme_self()->pollset);
}
}
break;
}
case SCTP_SHUTDOWN_EVENT :
{
ogs_sockaddr_t *addr = usrsctp_remote_addr(&store);
ogs_assert(addr);
ogs_debug("SCTP_SHUTDOWN_EVENT:"
"[T:0x%x, F:0x%x, L:0x%x]",
not->sn_shutdown_event.sse_type,
not->sn_shutdown_event.sse_flags,
not->sn_shutdown_event.sse_length);
e = mme_event_new(MME_EVT_S1AP_LO_CONNREFUSED);
ogs_assert(e);
e->enb_sock = (ogs_sock_t *)sock;
e->enb_addr = addr;
rv = ogs_queue_push(mme_self()->queue, e);
if (rv != OGS_OK) {
ogs_warn("ogs_queue_push() failed:%d", (int)rv);
ogs_free(e->enb_addr);
mme_event_free(e);
} else {
ogs_pollset_notify(mme_self()->pollset);
}
break;
}
case SCTP_PEER_ADDR_CHANGE:
ogs_warn("SCTP_PEER_ADDR_CHANGE:"
"[T:%d, F:0x%x, S:%d]",
not->sn_paddr_change.spc_type,
not->sn_paddr_change.spc_flags,
not->sn_paddr_change.spc_error);
break;
case SCTP_REMOTE_ERROR:
ogs_warn("SCTP_REMOTE_ERROR:[T:%d, F:0x%x, S:%d]",
not->sn_remote_error.sre_type,
not->sn_remote_error.sre_flags,
not->sn_remote_error.sre_error);
break;
case SCTP_SEND_FAILED :
ogs_error("SCTP_SEND_FAILED:[T:%d, F:0x%x, S:%d]",
not->sn_send_failed_event.ssfe_type,
not->sn_send_failed_event.ssfe_flags,
not->sn_send_failed_event.ssfe_error);
break;
default :
ogs_error("Discarding event with "
"unknown flags:0x%x type:0x%x",
flags, not->sn_header.sn_type);
break;
}
}
} else if (flags & MSG_EOR) {
ogs_pkbuf_t *pkbuf;
ogs_sockaddr_t *addr = NULL;
pkbuf = ogs_pkbuf_alloc(NULL, MAX_SDU_LEN);
ogs_pkbuf_put_data(pkbuf, data, datalen);
addr = usrsctp_remote_addr(&store);
ogs_assert(addr);
e = mme_event_new(MME_EVT_S1AP_MESSAGE);
ogs_assert(e);
e->enb_sock = (ogs_sock_t *)sock;
e->enb_addr = addr;
e->pkbuf = pkbuf;
rv = ogs_queue_push(mme_self()->queue, e);
if (rv != OGS_OK) {
ogs_warn("ogs_queue_push() failed:%d", (int)rv);
ogs_free(e->enb_addr);
ogs_pkbuf_free(e->pkbuf);
mme_event_free(e);
} else {
ogs_pollset_notify(mme_self()->pollset);
}
} else {
ogs_error("Not engough buffer. Need more recv : 0x%x", flags);
}
free(data);
}
return (1);
}
static ogs_sockaddr_t *usrsctp_remote_addr(union sctp_sockstore *store)
{
ogs_sockaddr_t *addr = NULL;
ogs_assert(store);
addr = ogs_calloc(1, sizeof(ogs_sockaddr_t));
ogs_assert(addr);
addr->ogs_sa_family = store->sin.sin_family;
switch(addr->ogs_sa_family) {
case AF_INET:
memcpy(&addr->sin, &store->sin, sizeof(struct sockaddr_in));
break;
case AF_INET6:
memcpy(&addr->sin6, &store->sin6, sizeof(struct sockaddr_in6));
break;
default:
ogs_assert_if_reached();
}
return addr;
}
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