mirror of https://gerrit.osmocom.org/libosmocore
[GPRS] Add Frame Relay in GRE encapsulation for NS
This commit is contained in:
parent
e0c42d1a3b
commit
b3ee265b69
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@ -107,6 +107,7 @@ enum ns_timeout {
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enum gprs_ns_ll {
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GPRS_NS_LL_UDP,
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GPRS_NS_LL_E1,
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GPRS_NS_LL_FR_GRE,
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};
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enum gprs_ns_evt {
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@ -130,15 +131,14 @@ struct gprs_ns_inst {
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uint16_t timeout[NS_TIMERS_COUNT];
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/* which link-layer are we based on? */
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enum gprs_ns_ll ll;
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union {
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/* NS-over-IP specific bits */
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struct {
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struct bsc_fd fd;
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} nsip;
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};
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/* NS-over-IP specific bits */
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struct {
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struct bsc_fd fd;
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} nsip;
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/* NS-over-FR-over-GRE-over-IP specific bits */
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struct {
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struct bsc_fd fd;
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} frgre;
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};
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enum nsvc_timer_mode {
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@ -168,10 +168,16 @@ struct gprs_nsvc {
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struct rate_ctr_group *ctrg;
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/* which link-layer are we based on? */
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enum gprs_ns_ll ll;
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union {
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struct {
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struct sockaddr_in bts_addr;
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} ip;
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struct {
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struct sockaddr_in bts_addr;
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} frgre;
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};
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};
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@ -181,15 +187,11 @@ struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb);
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/* Destroy a NS protocol instance */
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void gprs_ns_destroy(struct gprs_ns_inst *nsi);
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/* Listen for incoming GPRS packets */
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int nsip_listen(struct gprs_ns_inst *nsi, uint16_t udp_port);
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/* Listen for incoming GPRS packets via NS/UDP */
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int nsip_listen(struct gprs_ns_inst *nsi, uint32_t ip, uint16_t udp_port);
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struct sockaddr_in;
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/* main entry point, here incoming NS frames enter */
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int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg,
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struct sockaddr_in *saddr);
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/* main function for higher layers (BSSGP) to send NS messages */
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int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg);
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@ -197,8 +199,8 @@ int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause);
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int gprs_ns_tx_block(struct gprs_nsvc *nsvc, uint8_t cause);
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int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc);
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/* Listen for incoming GPRS packets */
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int nsip_listen(struct gprs_ns_inst *nsi, uint16_t udp_port);
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/* Listen for incoming GPRS packets via NS/FR/GRE */
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int gprs_ns_frgre_listen(struct gprs_ns_inst *nsi, uint32_t ip);
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/* Establish a connection (from the BSS) to the SGSN */
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struct gprs_nsvc *nsip_connect(struct gprs_ns_inst *nsi,
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@ -216,4 +218,7 @@ int gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause);
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/* Add NS-specific VTY stuff */
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int gprs_ns_vty_init(struct gprs_ns_inst *nsi);
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#define NS_ALLOC_SIZE 1024
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#endif
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@ -70,8 +70,6 @@
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#include <openbsc/gprs_ns.h>
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#include <openbsc/gprs_bssgp.h>
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#define NS_ALLOC_SIZE 1024
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static const struct tlv_definition ns_att_tlvdef = {
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.def = {
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[NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 },
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@ -204,6 +202,7 @@ const char *gprs_ns_cause_str(enum ns_cause cause)
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}
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static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg);
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extern int grps_ns_frgre_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg);
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static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg)
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{
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@ -215,12 +214,15 @@ static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg)
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rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]);
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rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], msgb_l2len(msg));
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switch (nsvc->nsi->ll) {
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switch (nsvc->ll) {
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case GPRS_NS_LL_UDP:
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ret = nsip_sendmsg(nsvc, msg);
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break;
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case GPRS_NS_LL_FR_GRE:
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ret = gprs_ns_frgre_sendmsg(nsvc, msg);
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break;
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default:
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LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->nsi->ll);
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LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->ll);
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msgb_free(msg);
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ret = -EIO;
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break;
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@ -644,7 +646,7 @@ static int gprs_ns_rx_block(struct gprs_nsvc *nsvc, struct msgb *msg)
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/* main entry point, here incoming NS frames enter */
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int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg,
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struct sockaddr_in *saddr)
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struct sockaddr_in *saddr, enum gprs_ns_ll ll)
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{
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struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
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struct gprs_nsvc *nsvc;
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@ -667,6 +669,7 @@ int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg,
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nsvc->nsvci = nsvc->nsei = 0xfffe;
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nsvc->ip.bts_addr = *saddr;
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nsvc->state = NSE_S_ALIVE;
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nsvc->ll = ll;
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#if 0
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return gprs_ns_tx_reset(nsvc, NS_CAUSE_PDU_INCOMP_PSTATE);
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#else
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@ -691,6 +694,7 @@ int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg,
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nsvc = nsvc_by_nsei(nsi, nsei);
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if (!nsvc) {
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nsvc = nsvc_create(nsi, 0xffff);
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nsvc->ll = ll;
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log_set_context(BSC_CTX_NSVC, nsvc);
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LOGP(DNS, LOGL_INFO, "Creating NS-VC for BSS at %s:%u\n",
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inet_ntoa(saddr->sin_addr), ntohs(saddr->sin_port));
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@ -858,7 +862,7 @@ static int handle_nsip_read(struct bsc_fd *bfd)
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if (!msg)
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return error;
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error = gprs_ns_rcvmsg(nsi, msg, &saddr);
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error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_UDP);
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msgb_free(msg);
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@ -871,7 +875,7 @@ static int handle_nsip_write(struct bsc_fd *bfd)
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return -EIO;
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}
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int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg)
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static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg)
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{
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int rc;
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struct gprs_ns_inst *nsi = nsvc->nsi;
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@ -898,19 +902,15 @@ static int nsip_fd_cb(struct bsc_fd *bfd, unsigned int what)
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return rc;
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}
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extern int make_sock(struct bsc_fd *bfd, int proto, uint16_t port,
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int (*cb)(struct bsc_fd *fd, unsigned int what));
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/* Listen for incoming GPRS packets */
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int nsip_listen(struct gprs_ns_inst *nsi, uint16_t udp_port)
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int nsip_listen(struct gprs_ns_inst *nsi, uint32_t ip, uint16_t udp_port)
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{
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int ret;
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ret = make_sock(&nsi->nsip.fd, IPPROTO_UDP, udp_port, nsip_fd_cb);
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ret = make_sock(&nsi->nsip.fd, IPPROTO_UDP, ip, udp_port, nsip_fd_cb);
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if (ret < 0)
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return ret;
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nsi->ll = GPRS_NS_LL_UDP;
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nsi->nsip.fd.data = nsi;
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return ret;
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@ -0,0 +1,222 @@
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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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/* NS-over-FR-over-GRE implementation */
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/* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <osmocore/select.h>
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#include <osmocore/msgb.h>
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#include <osmocore/talloc.h>
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#include <openbsc/socket.h>
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#include <openbsc/debug.h>
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#include <openbsc/gprs_ns.h>
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#define GRE_PTYPE_FR 0x6559
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struct gre_hdr {
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uint16_t flags;
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uint16_t ptype;
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} __attribute__ ((packed));
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static struct msgb *read_nsfrgre_msg(struct bsc_fd *bfd, int *error,
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struct sockaddr_in *saddr)
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{
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struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "Gb/NS/FR/GRE Rx");
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int ret = 0;
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socklen_t saddr_len = sizeof(*saddr);
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struct gre_hdr *greh;
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uint8_t *frh;
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uint32_t dlci;
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if (!msg) {
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*error = -ENOMEM;
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return NULL;
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}
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ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0,
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(struct sockaddr *)saddr, &saddr_len);
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if (ret < 0) {
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LOGP(DNS, LOGL_ERROR, "recv error %s during NS-FR-GRE recv\n",
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strerror(errno));
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*error = ret;
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return NULL;
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} else if (ret == 0) {
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msgb_free(msg);
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*error = ret;
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return NULL;
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}
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msgb_put(msg, ret);
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if (msg->len < sizeof(*greh)) {
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LOGP(DNS, LOGL_ERROR, "Short GRE packet: %u bytes\n", msg->len);
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*error = -EIO;
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goto out_err;
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}
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greh = (struct gre_hdr *) msg->data;
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if (greh->flags) {
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LOGP(DNS, LOGL_NOTICE, "Unknown GRE flags 0x%04x\n",
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ntohs(greh->flags));
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}
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if (greh->ptype != htons(GRE_PTYPE_FR)) {
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LOGP(DNS, LOGL_NOTICE, "Unknown GRE protocol 0x%04x != FR\n",
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ntohs(greh->ptype));
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*error = -EIO;
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goto out_err;
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}
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if (msg->len < sizeof(*greh) + 2) {
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LOGP(DNS, LOGL_ERROR, "Short FR header: %u bytes\n", msg->len);
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*error = -EIO;
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goto out_err;
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}
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frh = msg->data + sizeof(*greh);
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if (frh[0] & 0x01) {
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LOGP(DNS, LOGL_NOTICE, "Unsupported single-byte FR address\n");
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*error = -EIO;
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goto out_err;
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}
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dlci = (frh[0] & 0xfc << 2);
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if ((frh[1] & 0x0f) != 0x01) {
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LOGP(DNS, LOGL_NOTICE, "Unknown second FR octet 0x%02x\n",
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frh[1]);
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*error = -EIO;
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goto out_err;
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}
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dlci |= frh[1] >> 4;
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if (dlci > 0xffff) {
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LOGP(DNS, LOGL_ERROR, "We don't support DLCI > 65535 (%u)\n",
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dlci);
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*error = -EINVAL;
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goto out_err;
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}
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msg->l2h = msg->data + sizeof(*greh) + 2;
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/* Store DLCI in NETWORK BYTEORDER in sockaddr port member */
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saddr->sin_port = htons(dlci & 0xffff);
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return msg;
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out_err:
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msgb_free(msg);
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return NULL;
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}
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int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg,
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struct sockaddr_in *saddr, enum gprs_ns_ll ll);
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static int handle_nsfrgre_read(struct bsc_fd *bfd)
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{
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int error;
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struct sockaddr_in saddr;
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struct gprs_ns_inst *nsi = bfd->data;
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struct msgb *msg = read_nsfrgre_msg(bfd, &error, &saddr);
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if (!msg)
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return error;
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error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_FR_GRE);
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msgb_free(msg);
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return error;
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}
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static int handle_nsfrgre_write(struct bsc_fd *bfd)
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{
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/* FIXME: actually send the data here instead of nsip_sendmsg() */
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return -EIO;
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}
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int gprs_ns_frgre_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg)
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{
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int rc;
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struct gprs_ns_inst *nsi = nsvc->nsi;
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struct sockaddr_in daddr;
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uint16_t dlci = ntohs(nsvc->frgre.bts_addr.sin_port);
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uint8_t *frh;
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struct gre_hdr *greh;
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/* Build socket address for the packet destionation */
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daddr.sin_addr = nsvc->frgre.bts_addr.sin_addr;
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daddr.sin_port = IPPROTO_GRE;
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/* Prepend the FR header */
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frh = msgb_push(msg, sizeof(frh));
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frh[0] = (dlci >> 2) & 0xfc;
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frh[1] = (dlci & 0xf0) | 0x01;
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/* Prepend the GRE header */
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greh = (struct gre_hdr *) msgb_push(msg, sizeof(*greh));
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greh->flags = 0;
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greh->ptype = GRE_PTYPE_FR;
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rc = sendto(nsi->frgre.fd.fd, msg->data, msg->len, 0,
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(struct sockaddr *)&daddr, sizeof(daddr));
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talloc_free(msg);
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return rc;
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}
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static int nsfrgre_fd_cb(struct bsc_fd *bfd, unsigned int what)
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{
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int rc = 0;
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if (what & BSC_FD_READ)
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rc = handle_nsfrgre_read(bfd);
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if (what & BSC_FD_WRITE)
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rc = handle_nsfrgre_write(bfd);
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return rc;
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}
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int gprs_ns_frgre_listen(struct gprs_ns_inst *nsi, uint32_t ip)
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{
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int rc;
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/* Make sure we close any existing socket before changing it */
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if (nsi->frgre.fd.fd)
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close(nsi->frgre.fd.fd);
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rc = make_sock(&nsi->frgre.fd, IPPROTO_GRE, ip, 0, nsfrgre_fd_cb);
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if (rc < 0) {
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LOGP(DNS, LOGL_ERROR, "Error creating GRE socket (%s)\n",
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strerror(errno));
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return rc;
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}
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nsi->frgre.fd.data = nsi;
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return rc;
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}
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@ -79,7 +79,10 @@ static int config_write_ns(struct vty *vty)
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vty_out(vty, " nse %u remote-role %s%s",
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nsvc->nsei, nsvc->remote_end_is_sgsn ? "sgsn" : "bss",
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VTY_NEWLINE);
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if (nsvc->nsi->ll == GPRS_NS_LL_UDP) {
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switch (nsvc->ll) {
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case GPRS_NS_LL_UDP:
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vty_out(vty, " nse %u encapsulation udp%s", nsvc->nsei,
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VTY_NEWLINE);
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vty_out(vty, " nse %u remote-ip %s%s",
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nsvc->nsei,
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inet_ntoa(nsvc->ip.bts_addr.sin_addr),
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@ -87,6 +90,19 @@ static int config_write_ns(struct vty *vty)
|
|||
vty_out(vty, " nse %u remote-port %u%s",
|
||||
nsvc->nsei, ntohs(nsvc->ip.bts_addr.sin_port),
|
||||
VTY_NEWLINE);
|
||||
break;
|
||||
case GPRS_NS_LL_FR_GRE:
|
||||
vty_out(vty, " nse %u encapsulation framerelay-gre%s",
|
||||
nsvc->nsei, VTY_NEWLINE);
|
||||
vty_out(vty, " nse %u remote-ip %s%s",
|
||||
nsvc->nsei,
|
||||
inet_ntoa(nsvc->frgre.bts_addr.sin_addr),
|
||||
VTY_NEWLINE);
|
||||
vty_out(vty, " nse %u fr-dlci %u%s",
|
||||
nsvc->nsei, ntohs(nsvc->frgre.bts_addr.sin_port),
|
||||
VTY_NEWLINE);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -113,8 +129,9 @@ static void dump_nse(struct vty *vty, struct gprs_nsvc *nsvc, int stats)
|
|||
nsvc->remote_end_is_sgsn ? "SGSN" : "BSS",
|
||||
nsvc->state & NSE_S_ALIVE ? "ALIVE" : "DEAD",
|
||||
nsvc->state & NSE_S_BLOCKED ? "BLOCKED" : "UNBLOCKED");
|
||||
if (nsvc->nsi->ll == GPRS_NS_LL_UDP)
|
||||
vty_out(vty, ", %15s:%u",
|
||||
if (nsvc->ll == GPRS_NS_LL_UDP || nsvc->ll == GPRS_NS_LL_FR_GRE)
|
||||
vty_out(vty, ", %s %15s:%u",
|
||||
nsvc->ll == GPRS_NS_LL_UDP ? "UDP" : "FR-GRE",
|
||||
inet_ntoa(nsvc->ip.bts_addr.sin_addr),
|
||||
ntohs(nsvc->ip.bts_addr.sin_port));
|
||||
vty_out(vty, "%s", VTY_NEWLINE);
|
||||
|
|
@ -243,11 +260,68 @@ DEFUN(cfg_nse_remoteport, cfg_nse_remoteport_cmd,
|
|||
return CMD_WARNING;
|
||||
}
|
||||
|
||||
if (nsvc->ll != GPRS_NS_LL_UDP) {
|
||||
vty_out(vty, "Cannot set UDP Port on non-UDP NSE%s",
|
||||
VTY_NEWLINE);
|
||||
return CMD_WARNING;
|
||||
}
|
||||
|
||||
nsvc->ip.bts_addr.sin_port = htons(port);
|
||||
|
||||
return CMD_SUCCESS;
|
||||
}
|
||||
|
||||
DEFUN(cfg_nse_fr_dlci, cfg_nse_fr_dlci_cmd,
|
||||
"nse <0-65535> fr-dlci <0-1023>",
|
||||
NSE_CMD_STR
|
||||
"Frame Relay DLCI\n"
|
||||
"Frame Relay DLCI Number\n")
|
||||
{
|
||||
uint16_t nsei = atoi(argv[0]);
|
||||
uint16_t dlci = atoi(argv[1]);
|
||||
struct gprs_nsvc *nsvc;
|
||||
|
||||
nsvc = nsvc_by_nsei(vty_nsi, nsei);
|
||||
if (!nsvc) {
|
||||
vty_out(vty, "No such NSE (%u)%s", nsei, VTY_NEWLINE);
|
||||
return CMD_WARNING;
|
||||
}
|
||||
|
||||
if (nsvc->ll != GPRS_NS_LL_FR_GRE) {
|
||||
vty_out(vty, "Cannot set FR DLCI on non-FR NSE%s",
|
||||
VTY_NEWLINE);
|
||||
return CMD_WARNING;
|
||||
}
|
||||
|
||||
nsvc->frgre.bts_addr.sin_port = htons(dlci);
|
||||
|
||||
return CMD_SUCCESS;
|
||||
}
|
||||
|
||||
DEFUN(cfg_nse_encaps, cfg_nse_encaps_cmd,
|
||||
"nse <0-65535> encapsulation (udp|framerelay-gre)",
|
||||
NSE_CMD_STR
|
||||
"Encapsulation for NS\n"
|
||||
"UDP/IP Encapsulation\n" "Frame-Relay/GRE/IP Encapsulation\n")
|
||||
{
|
||||
uint16_t nsei = atoi(argv[0]);
|
||||
struct gprs_nsvc *nsvc;
|
||||
|
||||
nsvc = nsvc_by_nsei(vty_nsi, nsei);
|
||||
if (!nsvc) {
|
||||
vty_out(vty, "No such NSE (%u)%s", nsei, VTY_NEWLINE);
|
||||
return CMD_WARNING;
|
||||
}
|
||||
|
||||
if (!strcmp(argv[1], "udp"))
|
||||
nsvc->ll = GPRS_NS_LL_UDP;
|
||||
else
|
||||
nsvc->ll = GPRS_NS_LL_FR_GRE;
|
||||
|
||||
return CMD_SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
DEFUN(cfg_nse_remoterole, cfg_nse_remoterole_cmd,
|
||||
"nse <0-65535> remote-role (sgsn|bss)",
|
||||
NSE_CMD_STR
|
||||
|
|
@ -393,6 +467,8 @@ int gprs_ns_vty_init(struct gprs_ns_inst *nsi)
|
|||
install_element(NS_NODE, &cfg_nse_nsvci_cmd);
|
||||
install_element(NS_NODE, &cfg_nse_remoteip_cmd);
|
||||
install_element(NS_NODE, &cfg_nse_remoteport_cmd);
|
||||
install_element(NS_NODE, &cfg_nse_fr_dlci_cmd);
|
||||
install_element(NS_NODE, &cfg_nse_encaps_cmd);
|
||||
install_element(NS_NODE, &cfg_nse_remoterole_cmd);
|
||||
install_element(NS_NODE, &cfg_no_nse_cmd);
|
||||
install_element(NS_NODE, &cfg_ns_timer_cmd);
|
||||
|
|
|
|||
Loading…
Reference in New Issue