mirror of https://gerrit.osmocom.org/libosmocore
598 lines
15 KiB
C
598 lines
15 KiB
C
/*! \file gprs_ns2_udp.c
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* NS-over-UDP implementation.
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* GPRS Networks Service (NS) messages on the Gb interface.
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* 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05)
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* as well as its successor 3GPP TS 48.016 */
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/* (C) 2020 sysmocom - s.f.m.c. GmbH
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* Author: Alexander Couzens <lynxis@fe80.eu>
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <errno.h>
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#include <osmocom/core/osmo_io.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/sockaddr_str.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/gprs/gprs_ns2.h>
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#include "common_vty.h"
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#include "gprs_ns2_internal.h"
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static void free_bind(struct gprs_ns2_vc_bind *bind);
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struct gprs_ns2_vc_driver vc_driver_ip = {
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.name = "GB UDP IPv4/IPv6",
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.free_bind = free_bind,
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};
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struct priv_bind {
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struct osmo_io_fd *iofd;
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struct osmo_sockaddr addr;
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int dscp;
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uint8_t priority;
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};
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struct priv_vc {
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struct osmo_sockaddr remote;
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};
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/*! clean up all private driver state. Should be only called by gprs_ns2_free_bind() */
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static void free_bind(struct gprs_ns2_vc_bind *bind)
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{
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struct priv_bind *priv;
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if (!bind)
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return;
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OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
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priv = bind->priv;
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osmo_iofd_free(priv->iofd);
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priv->iofd = NULL;
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talloc_free(priv);
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}
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static void free_vc(struct gprs_ns2_vc *nsvc)
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{
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if (!nsvc)
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return;
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if (!nsvc->priv)
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return;
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OSMO_ASSERT(gprs_ns2_is_ip_bind(nsvc->bind));
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talloc_free(nsvc->priv);
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nsvc->priv = NULL;
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}
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static void dump_vty(const struct gprs_ns2_vc_bind *bind,
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struct vty *vty, bool stats)
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{
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struct priv_bind *priv;
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struct gprs_ns2_vc *nsvc;
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struct osmo_sockaddr_str sockstr = {};
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unsigned long nsvcs = 0;
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if (!bind)
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return;
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priv = bind->priv;
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if (osmo_sockaddr_str_from_sockaddr(&sockstr, &priv->addr.u.sas))
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strcpy(sockstr.ip, "invalid");
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llist_for_each_entry(nsvc, &bind->nsvc, blist) {
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nsvcs++;
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}
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vty_out(vty, "UDP bind: %s:%d DSCP: %d Priority: %u%s", sockstr.ip, sockstr.port,
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priv->dscp, priv->priority, VTY_NEWLINE);
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vty_out(vty, " IP-SNS signalling weight: %u data weight: %u%s",
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bind->sns_sig_weight, bind->sns_data_weight, VTY_NEWLINE);
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vty_out(vty, " %lu NS-VC:%s", nsvcs, VTY_NEWLINE);
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llist_for_each_entry(nsvc, &bind->nsvc, blist) {
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ns2_vty_dump_nsvc(vty, nsvc, stats);
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}
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}
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/*! Find a NS-VC by its remote socket address.
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* \param[in] bind in which to search
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* \param[in] rem_addr remote peer socket address to search
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* \returns NS-VC matching sockaddr; NULL if none found */
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struct gprs_ns2_vc *gprs_ns2_nsvc_by_sockaddr_bind(struct gprs_ns2_vc_bind *bind,
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const struct osmo_sockaddr *rem_addr)
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{
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struct gprs_ns2_vc *nsvc;
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struct priv_vc *vcpriv;
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OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
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llist_for_each_entry(nsvc, &bind->nsvc, blist) {
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vcpriv = nsvc->priv;
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if (vcpriv->remote.u.sa.sa_family != rem_addr->u.sa.sa_family)
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continue;
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if (osmo_sockaddr_cmp(&vcpriv->remote, rem_addr))
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continue;
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return nsvc;
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}
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return NULL;
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}
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static inline int nsip_sendmsg(struct gprs_ns2_vc_bind *bind,
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struct msgb *msg,
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const struct osmo_sockaddr *dest)
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{
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struct priv_bind *priv = bind->priv;
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return osmo_iofd_sendto_msgb(priv->iofd, msg, 0, dest);
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}
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/*! send the msg and free it afterwards.
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* \param nsvc NS-VC on which the message shall be sent
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* \param msg message to be sent
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* \return number of bytes transmitted; negative on error */
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static int nsip_vc_sendmsg(struct gprs_ns2_vc *nsvc, struct msgb *msg)
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{
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int rc;
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struct gprs_ns2_vc_bind *bind = nsvc->bind;
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struct priv_vc *priv = nsvc->priv;
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rc = nsip_sendmsg(bind, msg, &priv->remote);
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return rc;
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}
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static struct priv_vc *ns2_driver_alloc_vc(struct gprs_ns2_vc_bind *bind, struct gprs_ns2_vc *nsvc, const struct osmo_sockaddr *remote)
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{
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struct priv_vc *priv = talloc_zero(bind, struct priv_vc);
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if (!priv)
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return NULL;
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nsvc->priv = priv;
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priv->remote = *remote;
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return priv;
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}
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static void handle_nsip_recvfrom(struct osmo_io_fd *iofd, int error, struct msgb *msg,
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const struct osmo_sockaddr *saddr)
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{
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int rc = 0;
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struct gprs_ns2_vc_bind *bind = osmo_iofd_get_data(iofd);
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struct gprs_ns2_vc *nsvc;
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struct msgb *reject;
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msg->l2h = msgb_data(msg);
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/* check if a vc is available */
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nsvc = gprs_ns2_nsvc_by_sockaddr_bind(bind, saddr);
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if (!nsvc) {
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/* VC not found */
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rc = ns2_create_vc(bind, msg, saddr, "newconnection", &reject, &nsvc);
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switch (rc) {
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case NS2_CS_FOUND:
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break;
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case NS2_CS_ERROR:
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case NS2_CS_SKIPPED:
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rc = 0;
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goto out;
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case NS2_CS_REJECTED:
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/* nsip_sendmsg will free reject */
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rc = nsip_sendmsg(bind, reject, saddr);
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goto out;
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case NS2_CS_CREATED:
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ns2_driver_alloc_vc(bind, nsvc, saddr);
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/* only start the fsm for non SNS. SNS will take care of its own */
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if (nsvc->nse->dialect != GPRS_NS2_DIALECT_SNS)
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ns2_vc_fsm_start(nsvc);
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break;
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}
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}
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ns2_recv_vc(nsvc, msg);
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return;
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out:
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msgb_free(msg);
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}
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static void handle_nsip_sendto(struct osmo_io_fd *iofd, int res,
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struct msgb *msg,
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const struct osmo_sockaddr *daddr)
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{
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struct gprs_ns2_vc_bind *bind = osmo_iofd_get_data(iofd);
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struct gprs_ns2_vc *nsvc;
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nsvc = gprs_ns2_nsvc_by_sockaddr_bind(bind, daddr);
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if (!nsvc)
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return;
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if (OSMO_LIKELY(res >= 0)) {
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RATE_CTR_INC_NS(nsvc, NS_CTR_PKTS_OUT);
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RATE_CTR_ADD_NS(nsvc, NS_CTR_BYTES_OUT, res);
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} else {
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RATE_CTR_INC_NS(nsvc, NS_CTR_PKTS_OUT_DROP);
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RATE_CTR_ADD_NS(nsvc, NS_CTR_BYTES_OUT_DROP, msgb_length(msg));
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}
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}
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/*! Find NS bind for a given socket address
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* \param[in] nsi NS instance
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* \param[in] sockaddr socket address to search for
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* \return
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*/
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struct gprs_ns2_vc_bind *gprs_ns2_ip_bind_by_sockaddr(struct gprs_ns2_inst *nsi,
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const struct osmo_sockaddr *sockaddr)
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{
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struct gprs_ns2_vc_bind *bind;
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const struct osmo_sockaddr *local;
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OSMO_ASSERT(nsi);
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OSMO_ASSERT(sockaddr);
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llist_for_each_entry(bind, &nsi->binding, list) {
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if (!gprs_ns2_is_ip_bind(bind))
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continue;
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local = gprs_ns2_ip_bind_sockaddr(bind);
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if (!osmo_sockaddr_cmp(sockaddr, local))
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return bind;
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}
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return NULL;
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}
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/*! Bind to an IPv4/IPv6 address
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* \param[in] nsi NS Instance in which to create the NSVC
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* \param[in] local the local address to bind to
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* \param[in] dscp the DSCP/TOS bits used for transmitted data
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* \param[out] result pointer to the created bind or if a bind with the name exists return the bind.
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* \return 0 on success; negative on error. -EALREADY returned in case a bind with the name exists */
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int gprs_ns2_ip_bind(struct gprs_ns2_inst *nsi,
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const char *name,
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const struct osmo_sockaddr *local,
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int dscp,
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struct gprs_ns2_vc_bind **result)
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{
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struct gprs_ns2_vc_bind *bind;
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struct priv_bind *priv;
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int rc;
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struct osmo_io_ops ioops = {
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.sendto_cb = &handle_nsip_sendto,
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.recvfrom_cb = &handle_nsip_recvfrom,
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};
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if (local->u.sa.sa_family != AF_INET && local->u.sa.sa_family != AF_INET6)
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return -EINVAL;
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if (dscp < 0 || dscp > 63)
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return -EINVAL;
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bind = gprs_ns2_ip_bind_by_sockaddr(nsi, local);
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if (bind) {
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if (result)
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*result = bind;
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return -EBUSY;
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}
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rc = ns2_bind_alloc(nsi, name, &bind);
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if (rc < 0)
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return rc;
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bind->driver = &vc_driver_ip;
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bind->ll = GPRS_NS2_LL_UDP;
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/* expect 100 mbit at least.
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* TODO: ask the network layer about the speed. But would require
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* notification on change. */
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bind->transfer_capability = 100;
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bind->send_vc = nsip_vc_sendmsg;
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bind->free_vc = free_vc;
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bind->dump_vty = dump_vty;
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priv = bind->priv = talloc_zero(bind, struct priv_bind);
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if (!priv) {
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gprs_ns2_free_bind(bind);
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return -ENOMEM;
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}
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priv->addr = *local;
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priv->dscp = dscp;
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rc = osmo_sock_init_osa(SOCK_DGRAM, IPPROTO_UDP,
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local, NULL,
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OSMO_SOCK_F_BIND | OSMO_SOCK_F_DSCP(priv->dscp));
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if (rc < 0) {
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gprs_ns2_free_bind(bind);
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return rc;
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}
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priv->iofd = osmo_iofd_setup(bind, rc, "NS bind", OSMO_IO_FD_MODE_RECVFROM_SENDTO, &ioops, bind);
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osmo_iofd_register(priv->iofd, rc);
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osmo_iofd_set_alloc_info(priv->iofd, 4096, 128);
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osmo_iofd_set_txqueue_max_length(priv->iofd, nsi->txqueue_max_length);
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/* IPv4: max fragmented payload can be (13 bit) * 8 byte => 65535.
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* IPv6: max payload can be 65535 (RFC 2460).
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* UDP header = 8 byte */
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bind->mtu = 65535 - 8;
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if (result)
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*result = bind;
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return 0;
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}
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/*! Create new NS-VC to a given remote address
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* \param[in] bind the bind we want to connect
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* \param[in] nse NS entity to be used for the new NS-VC
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* \param[in] remote remote address to connect to
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* \return pointer to newly-allocated and connected NS-VC; NULL on error */
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struct gprs_ns2_vc *ns2_ip_bind_connect(struct gprs_ns2_vc_bind *bind,
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struct gprs_ns2_nse *nse,
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const struct osmo_sockaddr *remote)
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{
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struct gprs_ns2_vc *nsvc;
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const struct osmo_sockaddr *local;
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struct priv_vc *priv;
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enum gprs_ns2_vc_mode vc_mode;
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char idbuf[256], tmp[INET6_ADDRSTRLEN + 8];
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OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
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vc_mode = ns2_dialect_to_vc_mode(nse->dialect);
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if ((int) vc_mode == -1) {
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LOGNSE(nse, LOGL_ERROR, "Can not derive vc mode from dialect %d. Maybe libosmocore is too old.\n",
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nse->dialect);
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return NULL;
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}
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/* duplicate */
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if (gprs_ns2_nsvc_by_sockaddr_bind(bind, remote))
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return NULL;
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local = gprs_ns2_ip_bind_sockaddr(bind);
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osmo_sockaddr_to_str_buf(tmp, sizeof(tmp), local);
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snprintf(idbuf, sizeof(idbuf), "NSE%05u-NSVC-%s-%s-%s", nse->nsei, gprs_ns2_lltype_str(nse->ll),
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tmp, osmo_sockaddr_to_str(remote));
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osmo_identifier_sanitize_buf(idbuf, NULL, '_');
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nsvc = ns2_vc_alloc(bind, nse, true, vc_mode, idbuf);
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if (!nsvc)
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return NULL;
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nsvc->priv = talloc_zero(bind, struct priv_vc);
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if (!nsvc->priv) {
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gprs_ns2_free_nsvc(nsvc);
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return NULL;
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}
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priv = nsvc->priv;
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priv->remote = *remote;
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return nsvc;
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}
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/*! Return the socket address of the local peer of a NS-VC.
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* \param[in] nsvc NS-VC whose local peer we want to know
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* \return address of the local peer; NULL in case of error */
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const struct osmo_sockaddr *gprs_ns2_ip_vc_local(const struct gprs_ns2_vc *nsvc)
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{
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struct priv_bind *priv;
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if (nsvc->bind->driver != &vc_driver_ip)
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return NULL;
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priv = nsvc->bind->priv;
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return &priv->addr;
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}
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/*! Return the socket address of the remote peer of a NS-VC.
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* \param[in] nsvc NS-VC whose remote peer we want to know
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* \return address of the remote peer; NULL in case of error */
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const struct osmo_sockaddr *gprs_ns2_ip_vc_remote(const struct gprs_ns2_vc *nsvc)
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{
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struct priv_vc *priv;
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if (nsvc->bind->driver != &vc_driver_ip)
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return NULL;
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priv = nsvc->priv;
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return &priv->remote;
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}
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/*! Compare the NS-VC with the given parameter
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* \param[in] nsvc NS-VC to compare with
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* \param[in] local The local address
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* \param[in] remote The remote address
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* \param[in] nsvci NS-VCI will only be used if the NS-VC in BLOCKRESET mode otherwise NS-VCI isn't applicable.
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* \return true if the NS-VC has the same properties as given
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*/
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bool gprs_ns2_ip_vc_equal(const struct gprs_ns2_vc *nsvc,
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const struct osmo_sockaddr *local,
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const struct osmo_sockaddr *remote,
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uint16_t nsvci)
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{
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struct priv_vc *vpriv;
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struct priv_bind *bpriv;
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if (nsvc->bind->driver != &vc_driver_ip)
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return false;
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vpriv = nsvc->priv;
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bpriv = nsvc->bind->priv;
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if (osmo_sockaddr_cmp(local, &bpriv->addr))
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return false;
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if (osmo_sockaddr_cmp(remote, &vpriv->remote))
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return false;
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if (nsvc->mode == GPRS_NS2_VC_MODE_BLOCKRESET)
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if (nsvc->nsvci != nsvci)
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return false;
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return true;
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}
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/*! Return the locally bound socket address of the bind.
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* \param[in] bind The bind whose local address we want to know
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* \return address of the local bind */
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const struct osmo_sockaddr *gprs_ns2_ip_bind_sockaddr(struct gprs_ns2_vc_bind *bind)
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{
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struct priv_bind *priv;
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OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
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priv = bind->priv;
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return &priv->addr;
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}
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/*! Is the given bind an IP bind? */
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int gprs_ns2_is_ip_bind(struct gprs_ns2_vc_bind *bind)
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{
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return (bind->driver == &vc_driver_ip);
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}
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/*! Set the DSCP (TOS) bit value of the given bind. */
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int gprs_ns2_ip_bind_set_dscp(struct gprs_ns2_vc_bind *bind, int dscp)
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{
|
|
struct priv_bind *priv;
|
|
int rc = 0;
|
|
|
|
if (dscp < 0 || dscp > 63)
|
|
return -EINVAL;
|
|
|
|
OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
|
|
priv = bind->priv;
|
|
|
|
if (dscp != priv->dscp) {
|
|
priv->dscp = dscp;
|
|
|
|
rc = osmo_sock_set_dscp(osmo_iofd_get_fd(priv->iofd), dscp);
|
|
if (rc < 0) {
|
|
LOGBIND(bind, LOGL_ERROR, "Failed to set the DSCP to %u with ret(%d) errno(%d)\n",
|
|
dscp, rc, errno);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*! Set the socket priority of the given bind. */
|
|
int gprs_ns2_ip_bind_set_priority(struct gprs_ns2_vc_bind *bind, uint8_t priority)
|
|
{
|
|
struct priv_bind *priv;
|
|
int rc = 0;
|
|
|
|
OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
|
|
priv = bind->priv;
|
|
|
|
if (priority != priv->priority) {
|
|
priv->priority = priority;
|
|
|
|
rc = osmo_sock_set_priority(osmo_iofd_get_fd(priv->iofd), priority);
|
|
if (rc < 0) {
|
|
LOGBIND(bind, LOGL_ERROR, "Failed to set the priority to %u with ret(%d) errno(%d)\n",
|
|
priority, rc, errno);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*! Count UDP binds compatible with remote */
|
|
int ns2_ip_count_bind(struct gprs_ns2_inst *nsi, struct osmo_sockaddr *remote)
|
|
{
|
|
struct gprs_ns2_vc_bind *bind;
|
|
const struct osmo_sockaddr *sa;
|
|
int count = 0;
|
|
|
|
llist_for_each_entry(bind, &nsi->binding, list) {
|
|
if (!gprs_ns2_is_ip_bind(bind))
|
|
continue;
|
|
|
|
sa = gprs_ns2_ip_bind_sockaddr(bind);
|
|
if (!sa)
|
|
continue;
|
|
|
|
if (sa->u.sa.sa_family == remote->u.sa.sa_family)
|
|
count++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/* return the matching bind by index */
|
|
struct gprs_ns2_vc_bind *ns2_ip_get_bind_by_index(struct gprs_ns2_inst *nsi,
|
|
struct osmo_sockaddr *remote,
|
|
int index)
|
|
{
|
|
struct gprs_ns2_vc_bind *bind;
|
|
const struct osmo_sockaddr *sa;
|
|
int i = 0;
|
|
|
|
llist_for_each_entry(bind, &nsi->binding, list) {
|
|
if (!gprs_ns2_is_ip_bind(bind))
|
|
continue;
|
|
|
|
sa = gprs_ns2_ip_bind_sockaddr(bind);
|
|
if (!sa)
|
|
continue;
|
|
|
|
if (sa->u.sa.sa_family == remote->u.sa.sa_family) {
|
|
if (index == i)
|
|
return bind;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void ns2_ip_set_txqueue_max_length(struct gprs_ns2_vc_bind *bind, unsigned int max_length)
|
|
{
|
|
struct priv_bind *priv = bind->priv;
|
|
OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
|
|
|
|
osmo_iofd_set_txqueue_max_length(priv->iofd, max_length);
|
|
}
|
|
|
|
/*! set the signalling and data weight for this bind
|
|
* \param[in] bind
|
|
* \param[in] signalling the signalling weight
|
|
* \param[in] data the data weight
|
|
*/
|
|
void gprs_ns2_ip_bind_set_sns_weight(struct gprs_ns2_vc_bind *bind, uint8_t signalling, uint8_t data)
|
|
{
|
|
OSMO_ASSERT(gprs_ns2_is_ip_bind(bind));
|
|
bind->sns_sig_weight = signalling;
|
|
bind->sns_data_weight = data;
|
|
ns2_sns_update_weights(bind);
|
|
}
|