diff options
Diffstat (limited to 'openbsc/src')
-rw-r--r-- | openbsc/src/gprs/gprs_ns.c | 26 | ||||
-rw-r--r-- | openbsc/src/gprs/gprs_ns_frgre.c | 222 | ||||
-rw-r--r-- | openbsc/src/gprs/gprs_ns_vty.c | 82 |
3 files changed, 314 insertions, 16 deletions
diff --git a/openbsc/src/gprs/gprs_ns.c b/openbsc/src/gprs/gprs_ns.c index 6d028aba..4ef3603a 100644 --- a/openbsc/src/gprs/gprs_ns.c +++ b/openbsc/src/gprs/gprs_ns.c @@ -70,8 +70,6 @@ #include <openbsc/gprs_ns.h> #include <openbsc/gprs_bssgp.h> -#define NS_ALLOC_SIZE 1024 - static const struct tlv_definition ns_att_tlvdef = { .def = { [NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 }, @@ -204,6 +202,7 @@ const char *gprs_ns_cause_str(enum ns_cause cause) } static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg); +extern int grps_ns_frgre_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg); static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg) { @@ -215,12 +214,15 @@ static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg) rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]); rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], msgb_l2len(msg)); - switch (nsvc->nsi->ll) { + switch (nsvc->ll) { case GPRS_NS_LL_UDP: ret = nsip_sendmsg(nsvc, msg); break; + case GPRS_NS_LL_FR_GRE: + ret = gprs_ns_frgre_sendmsg(nsvc, msg); + break; default: - LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->nsi->ll); + LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->ll); msgb_free(msg); ret = -EIO; break; @@ -644,7 +646,7 @@ static int gprs_ns_rx_block(struct gprs_nsvc *nsvc, struct msgb *msg) /* main entry point, here incoming NS frames enter */ int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, - struct sockaddr_in *saddr) + struct sockaddr_in *saddr, enum gprs_ns_ll ll) { struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; struct gprs_nsvc *nsvc; @@ -667,6 +669,7 @@ int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, nsvc->nsvci = nsvc->nsei = 0xfffe; nsvc->ip.bts_addr = *saddr; nsvc->state = NSE_S_ALIVE; + nsvc->ll = ll; #if 0 return gprs_ns_tx_reset(nsvc, NS_CAUSE_PDU_INCOMP_PSTATE); #else @@ -691,6 +694,7 @@ int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, nsvc = nsvc_by_nsei(nsi, nsei); if (!nsvc) { nsvc = nsvc_create(nsi, 0xffff); + nsvc->ll = ll; log_set_context(BSC_CTX_NSVC, nsvc); LOGP(DNS, LOGL_INFO, "Creating NS-VC for BSS at %s:%u\n", inet_ntoa(saddr->sin_addr), ntohs(saddr->sin_port)); @@ -858,7 +862,7 @@ static int handle_nsip_read(struct bsc_fd *bfd) if (!msg) return error; - error = gprs_ns_rcvmsg(nsi, msg, &saddr); + error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_UDP); msgb_free(msg); @@ -871,7 +875,7 @@ static int handle_nsip_write(struct bsc_fd *bfd) return -EIO; } -int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg) +static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg) { int rc; struct gprs_ns_inst *nsi = nsvc->nsi; @@ -898,19 +902,15 @@ static int nsip_fd_cb(struct bsc_fd *bfd, unsigned int what) return rc; } -extern int make_sock(struct bsc_fd *bfd, int proto, uint16_t port, - int (*cb)(struct bsc_fd *fd, unsigned int what)); - /* Listen for incoming GPRS packets */ -int nsip_listen(struct gprs_ns_inst *nsi, uint16_t udp_port) +int nsip_listen(struct gprs_ns_inst *nsi, uint32_t ip, uint16_t udp_port) { int ret; - ret = make_sock(&nsi->nsip.fd, IPPROTO_UDP, udp_port, nsip_fd_cb); + ret = make_sock(&nsi->nsip.fd, IPPROTO_UDP, ip, udp_port, nsip_fd_cb); if (ret < 0) return ret; - nsi->ll = GPRS_NS_LL_UDP; nsi->nsip.fd.data = nsi; return ret; diff --git a/openbsc/src/gprs/gprs_ns_frgre.c b/openbsc/src/gprs/gprs_ns_frgre.c new file mode 100644 index 00000000..d58c1d9d --- /dev/null +++ b/openbsc/src/gprs/gprs_ns_frgre.c @@ -0,0 +1,222 @@ +/* GPRS Networks Service (NS) messages on the Gb interface + * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) */ + +/* NS-over-FR-over-GRE implementation */ + +/* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <errno.h> +#include <string.h> +#include <unistd.h> + +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <osmocore/select.h> +#include <osmocore/msgb.h> +#include <osmocore/talloc.h> + +#include <openbsc/socket.h> +#include <openbsc/debug.h> +#include <openbsc/gprs_ns.h> + +#define GRE_PTYPE_FR 0x6559 + +struct gre_hdr { + uint16_t flags; + uint16_t ptype; +} __attribute__ ((packed)); + +static struct msgb *read_nsfrgre_msg(struct bsc_fd *bfd, int *error, + struct sockaddr_in *saddr) +{ + struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "Gb/NS/FR/GRE Rx"); + int ret = 0; + socklen_t saddr_len = sizeof(*saddr); + struct gre_hdr *greh; + uint8_t *frh; + uint32_t dlci; + + if (!msg) { + *error = -ENOMEM; + return NULL; + } + + ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0, + (struct sockaddr *)saddr, &saddr_len); + if (ret < 0) { + LOGP(DNS, LOGL_ERROR, "recv error %s during NS-FR-GRE recv\n", + strerror(errno)); + *error = ret; + return NULL; + } else if (ret == 0) { + msgb_free(msg); + *error = ret; + return NULL; + } + + msgb_put(msg, ret); + + if (msg->len < sizeof(*greh)) { + LOGP(DNS, LOGL_ERROR, "Short GRE packet: %u bytes\n", msg->len); + *error = -EIO; + goto out_err; + } + + greh = (struct gre_hdr *) msg->data; + if (greh->flags) { + LOGP(DNS, LOGL_NOTICE, "Unknown GRE flags 0x%04x\n", + ntohs(greh->flags)); + } + if (greh->ptype != htons(GRE_PTYPE_FR)) { + LOGP(DNS, LOGL_NOTICE, "Unknown GRE protocol 0x%04x != FR\n", + ntohs(greh->ptype)); + *error = -EIO; + goto out_err; + } + + if (msg->len < sizeof(*greh) + 2) { + LOGP(DNS, LOGL_ERROR, "Short FR header: %u bytes\n", msg->len); + *error = -EIO; + goto out_err; + } + + frh = msg->data + sizeof(*greh); + if (frh[0] & 0x01) { + LOGP(DNS, LOGL_NOTICE, "Unsupported single-byte FR address\n"); + *error = -EIO; + goto out_err; + } + dlci = (frh[0] & 0xfc << 2); + if ((frh[1] & 0x0f) != 0x01) { + LOGP(DNS, LOGL_NOTICE, "Unknown second FR octet 0x%02x\n", + frh[1]); + *error = -EIO; + goto out_err; + } + dlci |= frh[1] >> 4; + if (dlci > 0xffff) { + LOGP(DNS, LOGL_ERROR, "We don't support DLCI > 65535 (%u)\n", + dlci); + *error = -EINVAL; + goto out_err; + } + + msg->l2h = msg->data + sizeof(*greh) + 2; + + /* Store DLCI in NETWORK BYTEORDER in sockaddr port member */ + saddr->sin_port = htons(dlci & 0xffff); + + return msg; + +out_err: + msgb_free(msg); + return NULL; +} + +int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, + struct sockaddr_in *saddr, enum gprs_ns_ll ll); + +static int handle_nsfrgre_read(struct bsc_fd *bfd) +{ + int error; + struct sockaddr_in saddr; + struct gprs_ns_inst *nsi = bfd->data; + struct msgb *msg = read_nsfrgre_msg(bfd, &error, &saddr); + + if (!msg) + return error; + + error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_FR_GRE); + + msgb_free(msg); + + return error; +} + +static int handle_nsfrgre_write(struct bsc_fd *bfd) +{ + /* FIXME: actually send the data here instead of nsip_sendmsg() */ + return -EIO; +} + +int gprs_ns_frgre_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg) +{ + int rc; + struct gprs_ns_inst *nsi = nsvc->nsi; + struct sockaddr_in daddr; + uint16_t dlci = ntohs(nsvc->frgre.bts_addr.sin_port); + uint8_t *frh; + struct gre_hdr *greh; + + /* Build socket address for the packet destionation */ + daddr.sin_addr = nsvc->frgre.bts_addr.sin_addr; + daddr.sin_port = IPPROTO_GRE; + + /* Prepend the FR header */ + frh = msgb_push(msg, sizeof(frh)); + frh[0] = (dlci >> 2) & 0xfc; + frh[1] = (dlci & 0xf0) | 0x01; + + /* Prepend the GRE header */ + greh = (struct gre_hdr *) msgb_push(msg, sizeof(*greh)); + greh->flags = 0; + greh->ptype = GRE_PTYPE_FR; + + rc = sendto(nsi->frgre.fd.fd, msg->data, msg->len, 0, + (struct sockaddr *)&daddr, sizeof(daddr)); + + talloc_free(msg); + + return rc; +} + +static int nsfrgre_fd_cb(struct bsc_fd *bfd, unsigned int what) +{ + int rc = 0; + + if (what & BSC_FD_READ) + rc = handle_nsfrgre_read(bfd); + if (what & BSC_FD_WRITE) + rc = handle_nsfrgre_write(bfd); + + return rc; +} + +int gprs_ns_frgre_listen(struct gprs_ns_inst *nsi, uint32_t ip) +{ + int rc; + + /* Make sure we close any existing socket before changing it */ + if (nsi->frgre.fd.fd) + close(nsi->frgre.fd.fd); + + rc = make_sock(&nsi->frgre.fd, IPPROTO_GRE, ip, 0, nsfrgre_fd_cb); + if (rc < 0) { + LOGP(DNS, LOGL_ERROR, "Error creating GRE socket (%s)\n", + strerror(errno)); + return rc; + } + nsi->frgre.fd.data = nsi; + + return rc; +} diff --git a/openbsc/src/gprs/gprs_ns_vty.c b/openbsc/src/gprs/gprs_ns_vty.c index c20016aa..7d439445 100644 --- a/openbsc/src/gprs/gprs_ns_vty.c +++ b/openbsc/src/gprs/gprs_ns_vty.c @@ -79,7 +79,10 @@ static int config_write_ns(struct vty *vty) vty_out(vty, " nse %u remote-role %s%s", nsvc->nsei, nsvc->remote_end_is_sgsn ? "sgsn" : "bss", VTY_NEWLINE); - if (nsvc->nsi->ll == GPRS_NS_LL_UDP) { + switch (nsvc->ll) { + case GPRS_NS_LL_UDP: + vty_out(vty, " nse %u encapsulation udp%s", nsvc->nsei, + VTY_NEWLINE); vty_out(vty, " nse %u remote-ip %s%s", nsvc->nsei, inet_ntoa(nsvc->ip.bts_addr.sin_addr), @@ -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); |