diff options
Diffstat (limited to 'src/gb/gprs_ns2_fr.c')
| -rw-r--r-- | src/gb/gprs_ns2_fr.c | 988 |
1 files changed, 988 insertions, 0 deletions
diff --git a/src/gb/gprs_ns2_fr.c b/src/gb/gprs_ns2_fr.c new file mode 100644 index 00000000..f6bee39c --- /dev/null +++ b/src/gb/gprs_ns2_fr.c @@ -0,0 +1,988 @@ +/*! \file gprs_ns2_fr.c + * NS-over-FR-over-GRE implementation. + * 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) + * as well as its successor 3GPP TS 48.016 */ + +/* (C) 2009-2021 by Harald Welte <laforge@gnumonks.org> + * (C) 2020 sysmocom - s.f.m.c. GmbH + * Author: Alexander Couzens <lynxis@fe80.eu> + * + * All Rights Reserved + * + * SPDX-License-Identifier: GPL-2.0+ + * + * 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, see <http://www.gnu.org/licenses/>. + * + */ + +#include <errno.h> +#include <string.h> +#include <unistd.h> + +#include <sys/socket.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <netinet/ip6.h> +#include <arpa/inet.h> +#include <linux/if.h> + +#include <sys/ioctl.h> +#include <netpacket/packet.h> +#include <linux/if_ether.h> +#include <linux/hdlc.h> +#include <linux/hdlc/ioctl.h> +#include <linux/sockios.h> + +#include <osmocom/gprs/frame_relay.h> +#include <osmocom/core/byteswap.h> +#include <osmocom/core/stat_item.h> +#include <osmocom/core/logging.h> +#include <osmocom/core/msgb.h> +#include <osmocom/core/select.h> +#include <osmocom/core/socket.h> +#include <osmocom/core/timer.h> +#include <osmocom/core/talloc.h> +#include <osmocom/gprs/gprs_ns2.h> +#include <osmocom/core/netdev.h> +#include <osmocom/gprs/protocol/gsm_08_16.h> +#include <osmocom/gprs/protocol/gsm_08_18.h> + +#include "config.h" +#include "common_vty.h" +#include "gprs_ns2_internal.h" + +#define GRE_PTYPE_FR 0x6559 +#define GRE_PTYPE_IPv4 0x0800 +#define GRE_PTYPE_IPv6 0x86dd +#define GRE_PTYPE_KAR 0x0000 /* keepalive response */ + +#ifndef IPPROTO_GRE +# define IPPROTO_GRE 47 +#endif + +#define E1_LINERATE 2048000 +#define E1_SLOTS_TOTAL 32 +#define E1_SLOTS_USED 31 +/* usable bitrate of the E1 superchannel with 31 of 32 timeslots */ +#define SUPERCHANNEL_LINERATE (E1_LINERATE*E1_SLOTS_USED)/E1_SLOTS_TOTAL +/* nanoseconds per bit (504) */ +#define BIT_DURATION_NS (1000000000 / SUPERCHANNEL_LINERATE) + +static void free_bind(struct gprs_ns2_vc_bind *bind); +static int fr_dlci_rx_cb(void *cb_data, struct msgb *msg); + +struct gprs_ns2_vc_driver vc_driver_fr = { + .name = "GB frame relay", + .free_bind = free_bind, +}; + +struct priv_bind { + struct osmo_netdev *netdev; + char netif[IFNAMSIZ]; + struct osmo_fr_link *link; + int ifindex; + bool if_running; + /* backlog queue for AF_PACKET / ENOBUFS handling (see OS#4995) */ + struct { + /* file-descriptor for AF_PACKET socket */ + struct osmo_fd ofd; + /* LMI bucket (we only store the last LMI message, no need to queue */ + struct msgb *lmi_msg; + /* list of NS msgb (backlog) */ + struct llist_head list; + /* timer to trigger next attempt of AF_PACKET write */ + struct osmo_timer_list timer; + /* re-try after that many micro-seconds */ + uint32_t retry_us; + } backlog; +}; + +struct priv_vc { + struct osmo_sockaddr remote; + uint16_t dlci; + struct osmo_fr_dlc *dlc; +}; + +static void free_vc(struct gprs_ns2_vc *nsvc) +{ + if (!nsvc) + return; + + if (!nsvc->priv) + return; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(nsvc->bind)); + talloc_free(nsvc->priv); + nsvc->priv = NULL; +} + +static void dump_vty(const struct gprs_ns2_vc_bind *bind, struct vty *vty, bool stats) +{ + struct priv_bind *priv; + struct gprs_ns2_vc *nsvc; + struct osmo_fr_link *fr_link; + + if (!bind) + return; + + priv = bind->priv; + fr_link = priv->link; + + vty_out(vty, "FR bind: %s, role: %s, link: %s%s", priv->netif, + osmo_fr_role_str(fr_link->role), priv->if_running ? "UP" : "DOWN", VTY_NEWLINE); + + llist_for_each_entry(nsvc, &bind->nsvc, blist) { + ns2_vty_dump_nsvc(vty, nsvc, stats); + } + + priv = bind->priv; +} + +/*! clean up all private driver state. Should be only called by gprs_ns2_free_bind() */ +static void free_bind(struct gprs_ns2_vc_bind *bind) +{ + struct priv_bind *priv; + struct msgb *msg, *msg2; + + if (!bind) + return; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(bind)); + priv = bind->priv; + + OSMO_ASSERT(llist_empty(&bind->nsvc)); + + osmo_timer_del(&priv->backlog.timer); + llist_for_each_entry_safe(msg, msg2, &priv->backlog.list, list) { + msgb_free(msg); + } + msgb_free(priv->backlog.lmi_msg); + + osmo_netdev_free(priv->netdev); + osmo_fr_link_free(priv->link); + osmo_fd_close(&priv->backlog.ofd); + talloc_free(priv); +} + +static void fr_dlci_status_cb(struct osmo_fr_dlc *dlc, void *cb_data, bool active) +{ + struct gprs_ns2_vc *nsvc = cb_data; + + if (active) { + ns2_vc_fsm_start(nsvc); + } else { + ns2_vc_force_unconfigured(nsvc); + } +} + +static struct priv_vc *fr_alloc_vc(struct gprs_ns2_vc_bind *bind, + struct gprs_ns2_vc *nsvc, + uint16_t dlci) +{ + struct priv_bind *privb = bind->priv; + struct priv_vc *priv = talloc_zero(bind, struct priv_vc); + if (!priv) + return NULL; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(bind)); + nsvc->priv = priv; + priv->dlci = dlci; + priv->dlc = osmo_fr_dlc_alloc(privb->link, dlci); + if (!priv->dlc) { + nsvc->priv = NULL; + talloc_free(priv); + return NULL; + } + + priv->dlc->cb_data = nsvc; + priv->dlc->rx_cb = fr_dlci_rx_cb; + priv->dlc->status_cb = fr_dlci_status_cb; + + return priv; +} + +int gprs_ns2_find_vc_by_dlci(struct gprs_ns2_vc_bind *bind, + uint16_t dlci, + struct gprs_ns2_vc **result) +{ + struct gprs_ns2_vc *nsvc; + struct priv_vc *vcpriv; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(bind)); + if (!result) + return -EINVAL; + + llist_for_each_entry(nsvc, &bind->nsvc, blist) { + vcpriv = nsvc->priv; + if (vcpriv->dlci != dlci) { + *result = nsvc; + return 0; + } + } + + return 1; +} + +/* PDU from the network interface towards the fr layer (upwards) */ +static int fr_netif_ofd_cb(struct osmo_fd *bfd, uint32_t what) +{ + struct gprs_ns2_vc_bind *bind = bfd->data; + struct priv_bind *priv = bind->priv; + struct msgb *msg; + struct sockaddr_ll sll; + socklen_t sll_len = sizeof(sll); + int rc = 0; + + /* we only handle read here. write to AF_PACKET sockets cannot be triggered + * by select or poll, see OS#4995 */ + if (!(what & OSMO_FD_READ)) + return 0; + + msg = msgb_alloc(NS_ALLOC_SIZE, "Gb/NS/FR Rx"); + if (!msg) + return -ENOMEM; + + rc = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0, (struct sockaddr *)&sll, &sll_len); + if (rc < 0) { + LOGBIND(bind, LOGL_ERROR, "recv error %s during NS-FR recv\n", strerror(errno)); + goto out_err; + } else if (rc == 0) { + goto out_err; + } + + /* ignore any packets that we might have received for a different interface, between + * the socket() and the bind() call */ + if (sll.sll_ifindex != priv->ifindex) + goto out_err; + + msgb_put(msg, rc); + msg->dst = priv->link; + return osmo_fr_rx(msg); + +out_err: + msgb_free(msg); + return rc; +} + +/* PDU from the frame relay towards the NS-VC (upwards) */ +static int fr_dlci_rx_cb(void *cb_data, struct msgb *msg) +{ + int rc; + struct gprs_ns2_vc *nsvc = cb_data; + + rc = ns2_recv_vc(nsvc, msg); + + return rc; +} + +static int fr_netif_write_one(struct gprs_ns2_vc_bind *bind, struct msgb *msg) +{ + struct priv_bind *priv = bind->priv; + unsigned int len = msgb_length(msg); + int rc; + + /* estimate the retry time based on the data rate it takes to transmit */ + priv->backlog.retry_us = (BIT_DURATION_NS * 8 * len) / 1000; + + rc = write(priv->backlog.ofd.fd, msgb_data(msg), len); + if (rc == len) { + msgb_free(msg); + return 0; + } else if (rc < 0) { + /* don't free, the caller might want to re-transmit */ + switch (errno) { + case EAGAIN: + case ENOBUFS: + /* not a real error, but more a normal event on AF_PACKET */ + /* don't free the message and let the caller re-enqueue */ + return -errno; + default: + /* an actual error, like -ENETDOWN, -EMSGSIZE */ + LOGBIND(bind, LOGL_ERROR, "error during write to AF_PACKET: %s\n", strerror(errno)); + msgb_free(msg); + return 0; + } + } else { + /* short write */ + LOGBIND(bind, LOGL_ERROR, "short write on AF_PACKET: %d < %d\n", rc, len); + msgb_free(msg); + return 0; + } +} + +/*! determine if given bind is for FR-GRE encapsulation. */ +int gprs_ns2_is_fr_bind(struct gprs_ns2_vc_bind *bind) +{ + return (bind->driver == &vc_driver_fr); +} + +/* PDU from the NS-VC towards the frame relay layer (downwards) */ +static int fr_vc_sendmsg(struct gprs_ns2_vc *nsvc, struct msgb *msg) +{ + struct priv_vc *vcpriv = nsvc->priv; + unsigned int vc_len = msgb_length(msg); + int rc; + + msg->dst = vcpriv->dlc; + rc = osmo_fr_tx_dlc(msg); + if (OSMO_LIKELY(rc >= 0)) { + RATE_CTR_INC_NS(nsvc, NS_CTR_PKTS_OUT); + RATE_CTR_ADD_NS(nsvc, NS_CTR_BYTES_OUT, vc_len); + } else { + RATE_CTR_INC_NS(nsvc, NS_CTR_PKTS_OUT_DROP); + RATE_CTR_ADD_NS(nsvc, NS_CTR_BYTES_OUT_DROP, vc_len); + } + return rc; +} + +static void enqueue_at_head(struct gprs_ns2_vc_bind *bind, struct msgb *msg) +{ + struct priv_bind *priv = bind->priv; + llist_add(&msg->list, &priv->backlog.list); + osmo_stat_item_inc(osmo_stat_item_group_get_item(bind->statg, NS2_BIND_STAT_BACKLOG_LEN), 1); + osmo_timer_schedule(&priv->backlog.timer, 0, priv->backlog.retry_us); +} + +static void enqueue_at_tail(struct gprs_ns2_vc_bind *bind, struct msgb *msg) +{ + struct priv_bind *priv = bind->priv; + llist_add_tail(&msg->list, &priv->backlog.list); + osmo_stat_item_inc(osmo_stat_item_group_get_item(bind->statg, NS2_BIND_STAT_BACKLOG_LEN), 1); + osmo_timer_schedule(&priv->backlog.timer, 0, priv->backlog.retry_us); +} + +#define LMI_Q933A_DLCI 0 + +/* enqueue to backlog (LMI, signaling) or drop (userdata msg) */ +static int backlog_enqueue_or_free(struct gprs_ns2_vc_bind *bind, struct msgb *msg) +{ + struct priv_bind *priv = bind->priv; + uint8_t dlci = msg->data[0]; + uint8_t ns_pdu_type; + uint16_t bvci; + + if (msgb_length(msg) < 1) + goto out_free; + + /* we want to enqueue only Q.933 LMI traffic or NS signaling; NOT user traffic */ + switch (dlci) { + case LMI_Q933A_DLCI: + /* always store only the last LMI message in the lmi_msg bucket */ + msgb_free(priv->backlog.lmi_msg); + priv->backlog.lmi_msg = msg; + return 0; + default: + /* there's no point in trying to enqueue messages if the interface is down */ + if (!priv->if_running) + break; + + if (msgb_length(msg) < 3) + break; + ns_pdu_type = msg->data[2]; + switch (ns_pdu_type) { + case NS_PDUT_UNITDATA: + if (msgb_length(msg) < 6) + break; + bvci = osmo_load16be(msg->data + 4); + /* enqueue BVCI=0 traffic at tail of queue */ + if (bvci == BVCI_SIGNALLING) { + enqueue_at_tail(bind, msg); + return 0; + } + break; + default: + /* enqueue NS signaling traffic at head of queue */ + enqueue_at_head(bind, msg); + return 0; + } + break; + } + +out_free: + /* drop everything that is not LMI, NS-signaling or BVCI-0 */ + msgb_free(msg); + return -1; +} + +static void fr_backlog_timer_cb(void *data) +{ + struct gprs_ns2_vc_bind *bind = data; + struct priv_bind *priv = bind->priv; + int i, rc; + + /* first try to get rid of the LMI message, if any */ + if (priv->backlog.lmi_msg) { + rc = fr_netif_write_one(bind, priv->backlog.lmi_msg); + if (rc < 0) + goto restart_timer; + /* fr_netif_write_one() has just free'd it */ + priv->backlog.lmi_msg = NULL; + } + + /* attempt to send up to 10 messages in every timer */ + for (i = 0; i < 10; i++) { + struct msgb *msg = msgb_dequeue(&priv->backlog.list); + if (!msg) + break; + + rc = fr_netif_write_one(bind, msg); + if (rc < 0) { + /* re-add at head of list */ + llist_add(&msg->list, &priv->backlog.list); + break; + } + osmo_stat_item_dec(osmo_stat_item_group_get_item(bind->statg, NS2_BIND_STAT_BACKLOG_LEN), 1); + } + +restart_timer: + /* re-start timer if we still have data in the queue */ + if (!llist_empty(&priv->backlog.list)) + osmo_timer_schedule(&priv->backlog.timer, 0, priv->backlog.retry_us); +} + +/* PDU from the frame relay layer towards the network interface (downwards) */ +int fr_tx_cb(void *data, struct msgb *msg) +{ + struct gprs_ns2_vc_bind *bind = data; + struct priv_bind *priv = bind->priv; + int rc; + + if (llist_empty(&priv->backlog.list)) { + /* attempt to transmit right now */ + rc = fr_netif_write_one(bind, msg); + if (rc < 0) { + /* enqueue to backlog in case it fails */ + return backlog_enqueue_or_free(bind, msg); + } + } else { + /* enqueue to backlog */ + return backlog_enqueue_or_free(bind, msg); + } + + return 0; +} + +static int devname2ifindex(const char *ifname) +{ + struct ifreq ifr; + int sk, rc; + + sk = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); + if (sk < 0) + return sk; + + + memset(&ifr, 0, sizeof(ifr)); + OSMO_STRLCPY_ARRAY(ifr.ifr_name, ifname); + + rc = ioctl(sk, SIOCGIFINDEX, &ifr); + close(sk); + if (rc < 0) + return rc; + + return ifr.ifr_ifindex; +} + +static int open_socket(int ifindex, const struct gprs_ns2_vc_bind *nsbind) +{ + struct sockaddr_ll addr; + int fd, rc; + + memset(&addr, 0, sizeof(addr)); + addr.sll_family = AF_PACKET; + addr.sll_protocol = htons(ETH_P_ALL); + addr.sll_ifindex = ifindex; + + fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_HDLC)); + if (fd < 0) { + LOGBIND(nsbind, LOGL_ERROR, "Can not create AF_PACKET socket. Are you root or have CAP_NET_RAW?\n"); + return fd; + } + + /* there's a race condition between the above syscall and the bind() call below, + * causing other packets to be received in between */ + + rc = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); + if (rc < 0) { + LOGBIND(nsbind, LOGL_ERROR, "Can not bind AF_PACKET socket to ifindex %d\n", ifindex); + close(fd); + return rc; + } + + return fd; +} + +static int gprs_n2_fr_ifupdown_ind_cb(struct osmo_netdev *netdev, bool if_running) +{ + struct gprs_ns2_vc_bind *bind = osmo_netdev_get_priv_data(netdev); + struct priv_bind *bpriv = bind->priv; + struct msgb *msg, *msg2; + + if (bpriv->if_running == if_running) + return 0; + + LOGBIND(bind, LOGL_NOTICE, "FR net-device '%s': Physical link state changed: %s\n", + bpriv->netif, if_running ? "UP" : "DOWN"); + + /* free any backlog, both on IFUP and IFDOWN. Keep the LMI, as it makes + * sense to get one out of the door ASAP. */ + llist_for_each_entry_safe(msg, msg2, &bpriv->backlog.list, list) { + msgb_free(msg); + } + + if (if_running) { + /* interface just came up */ + if (bpriv->backlog.lmi_msg) + osmo_timer_schedule(&bpriv->backlog.timer, 0, bpriv->backlog.retry_us); + } else { + /* interface just went down; no need to retransmit */ + osmo_timer_del(&bpriv->backlog.timer); + } + + bpriv->if_running = if_running; + return 0; +} + +static int gprs_n2_fr_mtu_chg_cb(struct osmo_netdev *netdev, uint32_t new_mtu) +{ + struct gprs_ns2_vc_bind *bind = osmo_netdev_get_priv_data(netdev); + struct priv_bind *bpriv = bind->priv; + struct gprs_ns2_nse *nse; + + /* 2 byte DLCI header */ + if (new_mtu <= 2) + return 0; + new_mtu -= 2; + + if (new_mtu == bind->mtu) + return 0; + + LOGBIND(bind, LOGL_INFO, "MTU changed from %d to %d.\n", + bind->mtu + 2, new_mtu + 2); + + bind->mtu = new_mtu; + if (!bpriv->if_running) + return 0; + + llist_for_each_entry(nse, &bind->nsi->nse, list) { + ns2_nse_update_mtu(nse); + } + return 0; +} + +static int set_ifupdown(const char *netif, bool up) +{ + int sock, rc; + struct ifreq req; + + sock = socket(AF_INET, SOCK_DGRAM, 0); + if (sock < 0) + return sock; + + memset(&req, 0, sizeof req); + OSMO_STRLCPY_ARRAY(req.ifr_name, netif); + + rc = ioctl(sock, SIOCGIFFLAGS, &req); + if (rc < 0) { + close(sock); + return rc; + } + + if ((req.ifr_flags & IFF_UP) == up) { + close(sock); + return 0; + } + + if (up) + req.ifr_flags |= IFF_UP; + + rc = ioctl(sock, SIOCSIFFLAGS, &req); + close(sock); + return rc; +} + +static int setup_device(const char *netif, const struct gprs_ns2_vc_bind *bind) +{ + int sock, rc; + char buffer[128]; + fr_proto *fr = (void*)buffer; + struct ifreq req; + + sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); + if (sock < 0) { + LOGBIND(bind, LOGL_ERROR, "%s: Unable to create socket: %s\n", + netif, strerror(errno)); + return sock; + } + + memset(&req, 0, sizeof(struct ifreq)); + memset(&buffer, 0, sizeof(buffer)); + OSMO_STRLCPY_ARRAY(req.ifr_name, netif); + req.ifr_settings.ifs_ifsu.sync = (void*)buffer; + req.ifr_settings.size = sizeof(buffer); + req.ifr_settings.type = IF_GET_PROTO; + + /* EINVAL is returned when no protocol has been set */ + rc = ioctl(sock, SIOCWANDEV, &req); + if (rc < 0 && errno != EINVAL) { + LOGBIND(bind, LOGL_ERROR, "%s: Unable to get FR protocol information: %s\n", + netif, strerror(errno)); + goto err; + } + + /* check if the device is good */ + if (rc == 0 && req.ifr_settings.type == IF_PROTO_FR && fr->lmi == LMI_NONE) { + LOGBIND(bind, LOGL_NOTICE, "%s: has correct frame relay mode and lmi\n", netif); + goto ifup; + } + + /* modify the device to match */ + rc = set_ifupdown(netif, false); + if (rc) { + LOGBIND(bind, LOGL_ERROR, "Unable to bring down the device %s: %s\n", + netif, strerror(errno)); + goto err; + } + + memset(&req, 0, sizeof(struct ifreq)); + memset(fr, 0, sizeof(fr_proto)); + OSMO_STRLCPY_ARRAY(req.ifr_name, netif); + req.ifr_settings.type = IF_PROTO_FR; + req.ifr_settings.size = sizeof(fr_proto); + req.ifr_settings.ifs_ifsu.fr = fr; + fr->lmi = LMI_NONE; + /* even those settings aren't used, they must be in the range */ + /* polling verification timer*/ + fr->t391 = 10; + /* link integrity verification polling timer */ + fr->t392 = 15; + /* full status polling counter*/ + fr->n391 = 6; + /* error threshold */ + fr->n392 = 3; + /* monitored events count */ + fr->n393 = 4; + + LOGBIND(bind, LOGL_INFO, "%s: Setting frame relay related parameters\n", netif); + rc = ioctl(sock, SIOCWANDEV, &req); + if (rc) { + LOGBIND(bind, LOGL_ERROR, "%s: Unable to set FR protocol on information: %s\n", + netif, strerror(errno)); + goto err; + } + +ifup: + rc = set_ifupdown(netif, true); + if (rc) + LOGBIND(bind, LOGL_ERROR, "Unable to bring up the device %s: %s\n", + netif, strerror(errno)); +err: + close(sock); + return rc; +} + +/*! Create a new bind for NS over FR. + * \param[in] nsi NS instance in which to create the bind + * \param[in] netif Network interface to bind to + * \param[in] fr_network + * \param[in] fr_role + * \param[out] result pointer to the created bind or if a bind with the name exists return the bind. + * \return 0 on success; negative on error. -EALREADY returned in case a bind with the name exists */ +int gprs_ns2_fr_bind(struct gprs_ns2_inst *nsi, + const char *name, + const char *netif, + struct osmo_fr_network *fr_network, + enum osmo_fr_role fr_role, + struct gprs_ns2_vc_bind **result) +{ + struct gprs_ns2_vc_bind *bind; + struct priv_bind *priv; + struct osmo_fr_link *fr_link; + int rc = 0; + + if (strlen(netif) > IFNAMSIZ) + return -EINVAL; + + bind = gprs_ns2_bind_by_name(nsi, name); + if (bind) { + if (result) + *result = bind; + return -EALREADY; + } + + rc = ns2_bind_alloc(nsi, name, &bind); + if (rc < 0) + return rc; + + bind->driver = &vc_driver_fr; + bind->ll = GPRS_NS2_LL_FR; + /* 2 mbit */ + bind->transfer_capability = 2; + bind->send_vc = fr_vc_sendmsg; + bind->free_vc = free_vc; + bind->dump_vty = dump_vty; + bind->mtu = FRAME_RELAY_SDU; + priv = bind->priv = talloc_zero(bind, struct priv_bind); + if (!priv) { + rc = -ENOMEM; + goto err_bind; + } + + INIT_LLIST_HEAD(&priv->backlog.list); + OSMO_STRLCPY_ARRAY(priv->netif, netif); + + /* FIXME: move fd handling into socket.c */ + fr_link = osmo_fr_link_alloc(fr_network, fr_role, netif); + if (!fr_link) { + rc = -EINVAL; + goto err_bind; + } + + fr_link->tx_cb = fr_tx_cb; + fr_link->cb_data = bind; + priv->link = fr_link; + + priv->ifindex = rc = devname2ifindex(netif); + if (rc < 0) { + LOGBIND(bind, LOGL_ERROR, "Can not get interface index for interface %s\n", netif); + goto err_fr; + } + + priv->netdev = osmo_netdev_alloc(bind, name); + if (!priv->netdev) { + rc = -ENOENT; + goto err_fr; + } + osmo_netdev_set_priv_data(priv->netdev, bind); + osmo_netdev_set_ifupdown_ind_cb(priv->netdev, gprs_n2_fr_ifupdown_ind_cb); + osmo_netdev_set_mtu_chg_cb(priv->netdev, gprs_n2_fr_mtu_chg_cb); + rc = osmo_netdev_set_ifindex(priv->netdev, priv->ifindex); + if (rc < 0) + goto err_free_netdev; + rc = osmo_netdev_register(priv->netdev); + if (rc < 0) + goto err_free_netdev; + + /* set protocol frame relay and lmi */ + rc = setup_device(priv->netif, bind); + if(rc < 0) { + LOGBIND(bind, LOGL_ERROR, "Failed to setup the interface %s for frame relay and lmi\n", netif); + goto err_free_netdev; + } + + rc = open_socket(priv->ifindex, bind); + if (rc < 0) + goto err_free_netdev; + priv->backlog.retry_us = 2500; /* start with some non-zero value; this corrsponds to 496 bytes */ + osmo_timer_setup(&priv->backlog.timer, fr_backlog_timer_cb, bind); + osmo_fd_setup(&priv->backlog.ofd, rc, OSMO_FD_READ, fr_netif_ofd_cb, bind, 0); + rc = osmo_fd_register(&priv->backlog.ofd); + if (rc < 0) + goto err_fd; + + if (result) + *result = bind; + + return rc; + +err_fd: + close(priv->backlog.ofd.fd); +err_free_netdev: + osmo_netdev_free(priv->netdev); + priv->netdev = NULL; +err_fr: + osmo_fr_link_free(fr_link); + priv->link = NULL; +err_bind: + gprs_ns2_free_bind(bind); + + return rc; +} + +/*! Return the frame relay role of a bind + * \param[in] bind The bind + * \return the frame relay role or -EINVAL if bind is not frame relay + */ +enum osmo_fr_role gprs_ns2_fr_bind_role(struct gprs_ns2_vc_bind *bind) +{ + struct priv_bind *priv; + + if (bind->driver != &vc_driver_fr) + return -EINVAL; + + priv = bind->priv; + return priv->link->role; +} + +/*! Return the network interface of the bind + * \param[in] bind The bind + * \return the network interface + */ +const char *gprs_ns2_fr_bind_netif(struct gprs_ns2_vc_bind *bind) +{ + struct priv_bind *priv; + + if (bind->driver != &vc_driver_fr) + return NULL; + + priv = bind->priv; + return priv->netif; +} + +/*! Find NS bind for a given network interface + * \param[in] nsi NS instance + * \param[in] netif the network interface to search for + * \return the bind or NULL if not found + */ +struct gprs_ns2_vc_bind *gprs_ns2_fr_bind_by_netif( + struct gprs_ns2_inst *nsi, + const char *netif) +{ + struct gprs_ns2_vc_bind *bind; + const char *_netif; + + OSMO_ASSERT(nsi); + OSMO_ASSERT(netif); + + llist_for_each_entry(bind, &nsi->binding, list) { + if (!gprs_ns2_is_fr_bind(bind)) + continue; + + _netif = gprs_ns2_fr_bind_netif(bind); + if (!strncmp(_netif, netif, IFNAMSIZ)) + return bind; + } + + return NULL; +} + +/*! Create, connect and activate a new FR-based NS-VC + * \param[in] bind bind in which the new NS-VC is to be created + * \param[in] nsei NSEI of the NS Entity in which the NS-VC is to be created + * \param[in] dlci Data Link connection identifier + * \return pointer to newly-allocated, connected and activated NS-VC; NULL on error */ +struct gprs_ns2_vc *gprs_ns2_fr_connect(struct gprs_ns2_vc_bind *bind, + struct gprs_ns2_nse *nse, + uint16_t nsvci, + uint16_t dlci) +{ + struct gprs_ns2_vc *nsvc = NULL; + struct priv_vc *priv = NULL; + struct priv_bind *bpriv = bind->priv; + char idbuf[64]; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(bind)); + nsvc = gprs_ns2_fr_nsvc_by_dlci(bind, dlci); + if (nsvc) { + goto err; + } + + snprintf(idbuf, sizeof(idbuf), "NSE%05u-NSVC%05u-%s-%s-DLCI%u", nse->nsei, nsvci, + gprs_ns2_lltype_str(nse->ll), bpriv->netif, dlci); + osmo_identifier_sanitize_buf(idbuf, NULL, '_'); + nsvc = ns2_vc_alloc(bind, nse, true, GPRS_NS2_VC_MODE_BLOCKRESET, idbuf); + if (!nsvc) + goto err; + + nsvc->priv = priv = fr_alloc_vc(bind, nsvc, dlci); + if (!priv) + goto err; + + nsvc->nsvci = nsvci; + nsvc->nsvci_is_valid = true; + + return nsvc; + +err: + gprs_ns2_free_nsvc(nsvc); + return NULL; +} + + +/*! Create, connect and activate a new FR-based NS-VC + * \param[in] bind bind in which the new NS-VC is to be created + * \param[in] nsei NSEI of the NS Entity in which the NS-VC is to be created + * \param[in] dlci Data Link connection identifier + * \return pointer to newly-allocated, connected and activated NS-VC; NULL on error */ +struct gprs_ns2_vc *gprs_ns2_fr_connect2(struct gprs_ns2_vc_bind *bind, + uint16_t nsei, + uint16_t nsvci, + uint16_t dlci) +{ + bool created_nse = false; + struct gprs_ns2_vc *nsvc = NULL; + struct gprs_ns2_nse *nse; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(bind)); + nse = gprs_ns2_nse_by_nsei(bind->nsi, nsei); + if (!nse) { + nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_FR, GPRS_NS2_DIALECT_STATIC_RESETBLOCK); + if (!nse) + return NULL; + created_nse = true; + } + + nsvc = gprs_ns2_fr_connect(bind, nse, nsvci, dlci); + if (!nsvc) + goto err_nse; + + return nsvc; + +err_nse: + if (created_nse) + gprs_ns2_free_nse(nse); + + return NULL; +} + +/*! Return the nsvc by dlci. + * \param[in] bind + * \param[in] dlci Data Link connection identifier + * \return the nsvc or NULL if not found + */ +struct gprs_ns2_vc *gprs_ns2_fr_nsvc_by_dlci(struct gprs_ns2_vc_bind *bind, + uint16_t dlci) +{ + struct gprs_ns2_vc *nsvc; + struct priv_vc *vcpriv; + + OSMO_ASSERT(gprs_ns2_is_fr_bind(bind)); + llist_for_each_entry(nsvc, &bind->nsvc, blist) { + vcpriv = nsvc->priv; + + if (dlci == vcpriv->dlci) + return nsvc; + } + + return NULL; +} + +/*! Return the dlci of the nsvc + * \param[in] nsvc + * \return the dlci or 0 on error. 0 is not a valid dlci. + */ +uint16_t gprs_ns2_fr_nsvc_dlci(const struct gprs_ns2_vc *nsvc) +{ + struct priv_vc *vcpriv; + + if (!nsvc->bind) + return 0; + + if (nsvc->bind->driver != &vc_driver_fr) + return 0; + + vcpriv = nsvc->priv; + return vcpriv->dlci; +} |