587 lines
15 KiB
C
587 lines
15 KiB
C
/*
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* (C) 2012-2013 by Pablo Neira Ayuso <pablo@gnumonks.org>
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* (C) 2012-2013 by On Waves ehf <http://www.on-waves.com>
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* All rights not specifically granted under this license are reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Affero General Public License as published by the
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* Free Software Foundation; either version 3 of the License, or (at your
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* option) any later version.
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*/
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#include <stdio.h> /* for printf */
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#include <string.h> /* for memcpy */
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#include <stdlib.h> /* for abs */
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#include <inttypes.h> /* for PRIu64 */
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#include <netinet/in.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/netif/osmux.h>
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#include <osmocom/netif/rtp.h>
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#include <openbsc/mgcp.h>
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#include <openbsc/mgcp_internal.h>
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#include <openbsc/osmux.h>
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static struct osmo_fd osmux_fd;
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static LLIST_HEAD(osmux_handle_list);
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struct osmux_handle {
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struct llist_head head;
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struct osmux_in_handle *in;
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struct in_addr rem_addr;
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int rem_port;
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int refcnt;
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};
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static void *osmux;
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static void osmux_deliver(struct msgb *batch_msg, void *data)
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{
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struct osmux_handle *handle = data;
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struct sockaddr_in out = {
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.sin_family = AF_INET,
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.sin_port = handle->rem_port,
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};
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memcpy(&out.sin_addr, &handle->rem_addr, sizeof(handle->rem_addr));
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sendto(osmux_fd.fd, batch_msg->data, batch_msg->len, 0,
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(struct sockaddr *)&out, sizeof(out));
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msgb_free(batch_msg);
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}
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static struct osmux_handle *
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osmux_handle_find_get(struct in_addr *addr, int rem_port)
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{
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struct osmux_handle *h;
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/* Lookup for existing OSMUX handle for this destination address. */
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llist_for_each_entry(h, &osmux_handle_list, head) {
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if (memcmp(&h->rem_addr, addr, sizeof(struct in_addr)) == 0 &&
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h->rem_port == rem_port) {
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LOGP(DMGCP, LOGL_DEBUG, "using existing OSMUX handle "
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"for addr=%s:%d\n",
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inet_ntoa(*addr), ntohs(rem_port));
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h->refcnt++;
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return h;
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}
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}
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return NULL;
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}
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static void osmux_handle_put(struct osmux_in_handle *in)
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{
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struct osmux_handle *h;
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/* Lookup for existing OSMUX handle for this destination address. */
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llist_for_each_entry(h, &osmux_handle_list, head) {
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if (h->in == in) {
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if (--h->refcnt == 0) {
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LOGP(DMGCP, LOGL_INFO,
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"Releasing unused osmux handle for %s:%d\n",
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inet_ntoa(h->rem_addr),
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ntohs(h->rem_port));
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LOGP(DMGCP, LOGL_INFO, "Stats: "
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"input RTP msgs: %u bytes: %"PRIu64" "
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"output osmux msgs: %u bytes: %"PRIu64"\n",
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in->stats.input_rtp_msgs,
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in->stats.input_rtp_bytes,
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in->stats.output_osmux_msgs,
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in->stats.output_osmux_bytes);
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llist_del(&h->head);
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osmux_xfrm_input_fini(h->in);
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talloc_free(h);
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}
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return;
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}
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}
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LOGP(DMGCP, LOGL_ERROR, "cannot find Osmux input handle %p\n", in);
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}
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static struct osmux_handle *
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osmux_handle_alloc(struct mgcp_config *cfg, struct in_addr *addr, int rem_port)
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{
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struct osmux_handle *h;
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h = talloc_zero(osmux, struct osmux_handle);
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if (!h)
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return NULL;
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h->rem_addr = *addr;
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h->rem_port = rem_port;
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h->refcnt++;
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h->in = talloc_zero(h, struct osmux_in_handle);
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if (!h->in) {
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talloc_free(h);
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return NULL;
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}
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h->in->osmux_seq = 0; /* sequence number to start OSmux message from */
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h->in->batch_factor = cfg->osmux_batch;
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/* If batch size is zero, the library defaults to 1470 bytes. */
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h->in->batch_size = cfg->osmux_batch_size;
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h->in->deliver = osmux_deliver;
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osmux_xfrm_input_init(h->in);
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h->in->data = h;
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llist_add(&h->head, &osmux_handle_list);
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LOGP(DMGCP, LOGL_DEBUG, "created new OSMUX handle for addr=%s:%d\n",
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inet_ntoa(*addr), ntohs(rem_port));
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return h;
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}
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static struct osmux_in_handle *
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osmux_handle_lookup(struct mgcp_config *cfg, struct in_addr *addr, int rem_port)
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{
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struct osmux_handle *h;
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h = osmux_handle_find_get(addr, rem_port);
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if (h != NULL)
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return h->in;
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h = osmux_handle_alloc(cfg, addr, rem_port);
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if (h == NULL)
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return NULL;
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return h->in;
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}
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int osmux_xfrm_to_osmux(int type, char *buf, int rc, struct mgcp_endpoint *endp)
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{
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int ret;
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struct msgb *msg;
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msg = msgb_alloc(4096, "RTP");
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if (!msg)
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return 0;
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memcpy(msg->data, buf, rc);
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msgb_put(msg, rc);
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while ((ret = osmux_xfrm_input(endp->osmux.in, msg, endp->osmux.cid)) > 0) {
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/* batch full, build and deliver it */
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osmux_xfrm_input_deliver(endp->osmux.in);
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}
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return 0;
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}
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static struct mgcp_endpoint *
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endpoint_lookup(struct mgcp_config *cfg, int cid,
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struct in_addr *from_addr, int type)
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{
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struct mgcp_endpoint *tmp = NULL;
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int i;
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/* Lookup for the endpoint that corresponds to this port */
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for (i=0; i<cfg->trunk.number_endpoints; i++) {
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struct in_addr *this;
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tmp = &cfg->trunk.endpoints[i];
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if (!tmp->allocated)
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continue;
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switch(type) {
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case MGCP_DEST_NET:
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this = &tmp->net_end.addr;
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break;
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case MGCP_DEST_BTS:
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this = &tmp->bts_end.addr;
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break;
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default:
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/* Should not ever happen */
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LOGP(DMGCP, LOGL_ERROR, "Bad type %d. Fix your code.\n", type);
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return NULL;
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}
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if (tmp->osmux.cid == cid && this->s_addr == from_addr->s_addr)
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return tmp;
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}
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LOGP(DMGCP, LOGL_ERROR, "Cannot find endpoint with cid=%d\n", cid);
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return NULL;
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}
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static void scheduled_tx_net_cb(struct msgb *msg, void *data)
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{
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struct mgcp_endpoint *endp = data;
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struct sockaddr_in addr = {
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.sin_addr = endp->net_end.addr,
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.sin_port = endp->net_end.rtp_port,
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};
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endp->bts_end.octets += msg->len;
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endp->bts_end.packets++;
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mgcp_send(endp, MGCP_DEST_NET, 1, &addr, (char *)msg->data, msg->len);
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msgb_free(msg);
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}
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static void scheduled_tx_bts_cb(struct msgb *msg, void *data)
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{
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struct mgcp_endpoint *endp = data;
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struct sockaddr_in addr = {
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.sin_addr = endp->bts_end.addr,
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.sin_port = endp->bts_end.rtp_port,
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};
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endp->net_end.octets += msg->len;
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endp->net_end.packets++;
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mgcp_send(endp, MGCP_DEST_BTS, 1, &addr, (char *)msg->data, msg->len);
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msgb_free(msg);
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}
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static struct msgb *osmux_recv(struct osmo_fd *ofd, struct sockaddr_in *addr)
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{
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struct msgb *msg;
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socklen_t slen = sizeof(*addr);
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int ret;
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msg = msgb_alloc(4096, "OSMUX");
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if (!msg) {
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LOGP(DMGCP, LOGL_ERROR, "cannot allocate message\n");
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return NULL;
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}
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ret = recvfrom(ofd->fd, msg->data, msg->data_len, 0,
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(struct sockaddr *)addr, &slen);
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if (ret <= 0) {
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msgb_free(msg);
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LOGP(DMGCP, LOGL_ERROR, "cannot receive message\n");
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return NULL;
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}
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msgb_put(msg, ret);
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return msg;
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}
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#define osmux_chunk_length(msg, rem) (rem - msg->len);
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int osmux_read_from_bsc_nat_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct msgb *msg;
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struct osmux_hdr *osmuxh;
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struct llist_head list;
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struct sockaddr_in addr;
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struct mgcp_config *cfg = ofd->data;
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uint32_t rem;
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msg = osmux_recv(ofd, &addr);
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if (!msg)
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return -1;
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/* not any further processing dummy messages */
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if (msg->data[0] == MGCP_DUMMY_LOAD)
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goto out;
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rem = msg->len;
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while((osmuxh = osmux_xfrm_output_pull(msg)) != NULL) {
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struct mgcp_endpoint *endp;
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/* Yes, we use MGCP_DEST_NET to locate the origin */
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endp = endpoint_lookup(cfg, osmuxh->circuit_id,
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&addr.sin_addr, MGCP_DEST_NET);
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if (!endp) {
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LOGP(DMGCP, LOGL_ERROR,
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"Cannot find an endpoint for circuit_id=%d\n",
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osmuxh->circuit_id);
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goto out;
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}
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endp->osmux.stats.octets += osmux_chunk_length(msg, rem);
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endp->osmux.stats.chunks++;
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rem = msg->len;
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osmux_xfrm_output(osmuxh, &endp->osmux.out, &list);
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osmux_tx_sched(&list, scheduled_tx_bts_cb, endp);
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}
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out:
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msgb_free(msg);
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return 0;
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}
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/* This is called from the bsc-nat */
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static int osmux_handle_dummy(struct mgcp_config *cfg, struct sockaddr_in *addr,
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struct msgb *msg)
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{
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struct mgcp_endpoint *endp;
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uint8_t osmux_cid;
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if (msg->len < 1 + sizeof(osmux_cid)) {
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LOGP(DMGCP, LOGL_ERROR,
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"Discarding truncated Osmux dummy load\n");
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goto out;
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}
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LOGP(DMGCP, LOGL_DEBUG, "Received Osmux dummy load from %s\n",
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inet_ntoa(addr->sin_addr));
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if (!cfg->osmux) {
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LOGP(DMGCP, LOGL_ERROR,
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"bsc wants to use Osmux but bsc-nat did not request it\n");
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goto out;
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}
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/* extract the osmux CID from the dummy message */
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memcpy(&osmux_cid, &msg->data[1], sizeof(osmux_cid));
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endp = endpoint_lookup(cfg, osmux_cid, &addr->sin_addr, MGCP_DEST_BTS);
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if (!endp) {
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LOGP(DMGCP, LOGL_ERROR,
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"Cannot find endpoint for Osmux CID %d\n", osmux_cid);
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goto out;
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}
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if (endp->osmux.state == OSMUX_STATE_ENABLED)
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goto out;
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if (osmux_enable_endpoint(endp, OSMUX_ROLE_BSC_NAT,
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&addr->sin_addr, addr->sin_port) < 0 ){
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LOGP(DMGCP, LOGL_ERROR,
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"Could not enable osmux in endpoint %d\n",
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ENDPOINT_NUMBER(endp));
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goto out;
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}
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LOGP(DMGCP, LOGL_INFO, "Enabling osmux in endpoint %d for %s:%u\n",
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ENDPOINT_NUMBER(endp), inet_ntoa(addr->sin_addr),
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ntohs(addr->sin_port));
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out:
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msgb_free(msg);
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return 0;
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}
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int osmux_read_from_bsc_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct msgb *msg;
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struct osmux_hdr *osmuxh;
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struct llist_head list;
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struct sockaddr_in addr;
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struct mgcp_config *cfg = ofd->data;
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uint32_t rem;
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msg = osmux_recv(ofd, &addr);
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if (!msg)
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return -1;
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/* not any further processing dummy messages */
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if (msg->data[0] == MGCP_DUMMY_LOAD)
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return osmux_handle_dummy(cfg, &addr, msg);
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rem = msg->len;
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while((osmuxh = osmux_xfrm_output_pull(msg)) != NULL) {
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struct mgcp_endpoint *endp;
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/* Yes, we use MGCP_DEST_BTS to locate the origin */
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endp = endpoint_lookup(cfg, osmuxh->circuit_id,
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&addr.sin_addr, MGCP_DEST_BTS);
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if (!endp) {
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LOGP(DMGCP, LOGL_ERROR,
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"Cannot find an endpoint for circuit_id=%d\n",
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osmuxh->circuit_id);
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goto out;
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}
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endp->osmux.stats.octets += osmux_chunk_length(msg, rem);
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endp->osmux.stats.chunks++;
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rem = msg->len;
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osmux_xfrm_output(osmuxh, &endp->osmux.out, &list);
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osmux_tx_sched(&list, scheduled_tx_net_cb, endp);
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}
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out:
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msgb_free(msg);
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return 0;
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}
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int osmux_init(int role, struct mgcp_config *cfg)
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{
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int ret;
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switch(role) {
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case OSMUX_ROLE_BSC:
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osmux_fd.cb = osmux_read_from_bsc_nat_cb;
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break;
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case OSMUX_ROLE_BSC_NAT:
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osmux_fd.cb = osmux_read_from_bsc_cb;
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break;
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default:
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LOGP(DMGCP, LOGL_ERROR, "wrong role for OSMUX\n");
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return -1;
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}
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osmux_fd.data = cfg;
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ret = mgcp_create_bind(cfg->osmux_addr, &osmux_fd, cfg->osmux_port);
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if (ret < 0) {
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LOGP(DMGCP, LOGL_ERROR, "cannot bind OSMUX socket\n");
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return ret;
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}
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mgcp_set_ip_tos(osmux_fd.fd, cfg->endp_dscp);
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osmux_fd.when |= BSC_FD_READ;
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ret = osmo_fd_register(&osmux_fd);
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if (ret < 0) {
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LOGP(DMGCP, LOGL_ERROR, "cannot register OSMUX socket\n");
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return ret;
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}
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cfg->osmux_init = 1;
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return 0;
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}
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int osmux_enable_endpoint(struct mgcp_endpoint *endp, int role,
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struct in_addr *addr, uint16_t port)
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{
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/* If osmux is enabled, initialize the output handler. This handler is
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* used to reconstruct the RTP flow from osmux. The RTP SSRC is
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* allocated based on the circuit ID (endp->osmux.cid), which is unique
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* in the local scope to the BSC/BSC-NAT. We use it to divide the RTP
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* SSRC space (2^32) by the 256 possible circuit IDs, then randomly
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* select one value from that window. Thus, we have no chance to have
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* overlapping RTP SSRC traveling to the BTSes behind the BSC,
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* similarly, for flows traveling to the MSC.
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*/
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static const uint32_t rtp_ssrc_winlen = UINT32_MAX / 256;
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if (endp->osmux.state == OSMUX_STATE_DISABLED) {
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LOGP(DMGCP, LOGL_ERROR, "Endpoint %u didn't request Osmux\n",
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ENDPOINT_NUMBER(endp));
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return -1;
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}
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osmux_xfrm_output_init(&endp->osmux.out,
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(endp->osmux.cid * rtp_ssrc_winlen) +
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(random() % rtp_ssrc_winlen));
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endp->osmux.in = osmux_handle_lookup(endp->cfg, addr, port);
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if (!endp->osmux.in) {
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LOGP(DMGCP, LOGL_ERROR, "Cannot allocate input osmux handle\n");
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return -1;
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}
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if (!osmux_xfrm_input_open_circuit(endp->osmux.in, endp->osmux.cid,
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endp->cfg->osmux_dummy)) {
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LOGP(DMGCP, LOGL_ERROR, "Cannot open osmux circuit %u\n",
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endp->osmux.cid);
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return -1;
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}
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switch (endp->cfg->role) {
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case MGCP_BSC_NAT:
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endp->type = MGCP_OSMUX_BSC_NAT;
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break;
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case MGCP_BSC:
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endp->type = MGCP_OSMUX_BSC;
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break;
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}
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endp->osmux.state = OSMUX_STATE_ENABLED;
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return 0;
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}
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void osmux_disable_endpoint(struct mgcp_endpoint *endp)
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{
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LOGP(DMGCP, LOGL_INFO, "Releasing endpoint %u using Osmux CID %u\n",
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ENDPOINT_NUMBER(endp), endp->osmux.cid);
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osmux_xfrm_input_close_circuit(endp->osmux.in, endp->osmux.cid);
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endp->osmux.state = OSMUX_STATE_DISABLED;
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endp->osmux.cid = -1;
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osmux_handle_put(endp->osmux.in);
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}
|
|
|
|
void osmux_release_cid(struct mgcp_endpoint *endp)
|
|
{
|
|
if (endp->osmux.allocated_cid >= 0)
|
|
osmux_put_cid(endp->osmux.allocated_cid);
|
|
endp->osmux.allocated_cid = -1;
|
|
}
|
|
|
|
void osmux_allocate_cid(struct mgcp_endpoint *endp)
|
|
{
|
|
osmux_release_cid(endp);
|
|
endp->osmux.allocated_cid = osmux_get_cid();
|
|
}
|
|
|
|
/* We don't need to send the dummy load for osmux so often as another endpoint
|
|
* may have already punched the hole in the firewall. This approach is simple
|
|
* though.
|
|
*/
|
|
int osmux_send_dummy(struct mgcp_endpoint *endp)
|
|
{
|
|
char buf[1 + sizeof(uint8_t)];
|
|
struct in_addr addr_unset = {};
|
|
|
|
buf[0] = MGCP_DUMMY_LOAD;
|
|
memcpy(&buf[1], &endp->osmux.cid, sizeof(endp->osmux.cid));
|
|
|
|
/* Wait until we have the connection information from MDCX */
|
|
if (memcmp(&endp->net_end.addr, &addr_unset, sizeof(addr_unset)) == 0)
|
|
return 0;
|
|
|
|
if (endp->osmux.state == OSMUX_STATE_ACTIVATING) {
|
|
if (osmux_enable_endpoint(endp, OSMUX_ROLE_BSC,
|
|
&endp->net_end.addr,
|
|
htons(endp->cfg->osmux_port)) < 0) {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Could not activate osmux in endpoint %d\n",
|
|
ENDPOINT_NUMBER(endp));
|
|
}
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Osmux CID %u for %s:%u is now enabled\n",
|
|
endp->osmux.cid, inet_ntoa(endp->net_end.addr),
|
|
endp->cfg->osmux_port);
|
|
}
|
|
LOGP(DMGCP, LOGL_DEBUG,
|
|
"sending OSMUX dummy load to %s CID %u\n",
|
|
inet_ntoa(endp->net_end.addr), endp->osmux.cid);
|
|
|
|
return mgcp_udp_send(osmux_fd.fd, &endp->net_end.addr,
|
|
htons(endp->cfg->osmux_port), buf, sizeof(buf));
|
|
}
|
|
|
|
/* bsc-nat allocates/releases the Osmux circuit ID */
|
|
static uint8_t osmux_cid_bitmap[(OSMUX_CID_MAX + 1) / 8];
|
|
|
|
int osmux_used_cid(void)
|
|
{
|
|
int i, j, used = 0;
|
|
|
|
for (i = 0; i < sizeof(osmux_cid_bitmap); i++) {
|
|
for (j = 0; j < 8; j++) {
|
|
if (osmux_cid_bitmap[i] & (1 << j))
|
|
used += 1;
|
|
}
|
|
}
|
|
|
|
return used;
|
|
}
|
|
|
|
int osmux_get_cid(void)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < sizeof(osmux_cid_bitmap); i++) {
|
|
for (j = 0; j < 8; j++) {
|
|
if (osmux_cid_bitmap[i] & (1 << j))
|
|
continue;
|
|
|
|
osmux_cid_bitmap[i] |= (1 << j);
|
|
LOGP(DMGCP, LOGL_DEBUG,
|
|
"Allocating Osmux CID %u from pool\n", (i * 8) + j);
|
|
return (i * 8) + j;
|
|
}
|
|
}
|
|
|
|
LOGP(DMGCP, LOGL_ERROR, "All Osmux circuits are in use!\n");
|
|
return -1;
|
|
}
|
|
|
|
void osmux_put_cid(uint8_t osmux_cid)
|
|
{
|
|
LOGP(DMGCP, LOGL_DEBUG, "Osmux CID %u is back to the pool\n", osmux_cid);
|
|
osmux_cid_bitmap[osmux_cid / 8] &= ~(1 << (osmux_cid % 8));
|
|
}
|