| /*! \file gprs_ns.c |
| * 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) 2009-2018 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2016-2017 sysmocom - s.f.m.c. GmbH |
| * |
| * 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/>. |
| * |
| */ |
| |
| /*! \addtogroup libgb |
| * @{ |
| * |
| * 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) |
| * |
| * Some introduction into NS: NS is used typically on top of frame relay, |
| * but in the ip.access world it is encapsulated in UDP packets. It serves |
| * as an intermediate shim betwen BSSGP and the underlying medium. It doesn't |
| * do much, apart from providing congestion notification and status indication. |
| * |
| * Terms: |
| * |
| * NS Network Service |
| * NSVC NS Virtual Connection |
| * NSEI NS Entity Identifier |
| * NSVL NS Virtual Link |
| * NSVLI NS Virtual Link Identifier |
| * BVC BSSGP Virtual Connection |
| * BVCI BSSGP Virtual Connection Identifier |
| * NSVCG NS Virtual Connection Goup |
| * Blocked NS-VC cannot be used for user traffic |
| * Alive Ability of a NS-VC to provide communication |
| * |
| * There can be multiple BSSGP virtual connections over one (group of) NSVC's. BSSGP will |
| * therefore identify the BSSGP virtual connection by a BVCI passed down to NS. |
| * NS then has to figure out which NSVC's are responsible for this BVCI. |
| * Those mappings are administratively configured. |
| * |
| * This implementation has the following limitations: |
| * - Only one NS-VC for each NSE: No load-sharing function |
| * - NSVCI 65535 and 65534 are reserved for internal use |
| * - Only UDP is supported as of now, no frame relay support |
| * - There are no BLOCK and UNBLOCK timers (yet?) |
| * |
| * \file gprs_ns.c */ |
| |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <stdint.h> |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/fsm.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/byteswap.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/stat_item.h> |
| #include <osmocom/core/stats.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/signal.h> |
| #include <osmocom/gprs/gprs_ns.h> |
| #include <osmocom/gprs/gprs_bssgp.h> |
| #include <osmocom/gprs/gprs_ns_frgre.h> |
| |
| #include "common_vty.h" |
| #include "gb_internal.h" |
| |
| #define ns_set_state(ns_, st_) ns_set_state_with_log(ns_, st_, false, __FILE__, __LINE__) |
| #define ns_set_remote_state(ns_, st_) ns_set_state_with_log(ns_, st_, true, __FILE__, __LINE__) |
| #define ns_mark_blocked(ns_) ns_set_state(ns_, (ns_)->state | NSE_S_BLOCKED) |
| #define ns_mark_unblocked(ns_) ns_set_state(ns_, (ns_)->state & (~NSE_S_BLOCKED)); |
| #define ns_mark_alive(ns_) ns_set_state(ns_, (ns_)->state | NSE_S_ALIVE) |
| #define ns_mark_dead(ns_) ns_set_state(ns_, (ns_)->state & (~NSE_S_ALIVE)); |
| |
| #define ERR_IF_NSVC_USES_SNS(nsvc, reason) \ |
| do { \ |
| if ((nsvc)->nsi->bss_sns_fi) { \ |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Asked to %s. Rejected on IP-SNS\n", \ |
| nsvc->nsei, reason); \ |
| osmo_log_backtrace(DNS, LOGL_ERROR); \ |
| return -EIO; \ |
| } \ |
| } while (0) |
| |
| static const struct tlv_definition ns_att_tlvdef = { |
| .def = { |
| [NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_VCI] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_PDU] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_BVCI] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_NSEI] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_IPv4_LIST] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_IPv6_LIST] = { TLV_TYPE_TvLV, 0 }, |
| [NS_IE_MAX_NR_NSVC] = { TLV_TYPE_FIXED, 2 }, |
| [NS_IE_IPv4_EP_NR] = { TLV_TYPE_FIXED, 2 }, |
| [NS_IE_IPv6_EP_NR] = { TLV_TYPE_FIXED, 2 }, |
| [NS_IE_RESET_FLAG] = { TLV_TYPE_TV, 0 }, |
| /* TODO: IP_ADDR can be 5 or 17 bytes long, depending on first byte. This |
| * cannot be expressed in our TLV parser. However, we don't do IPv6 anyway */ |
| [NS_IE_IP_ADDR] = { TLV_TYPE_FIXED, 5 }, |
| }, |
| }; |
| |
| enum ns_ctr { |
| NS_CTR_PKTS_IN, |
| NS_CTR_PKTS_OUT, |
| NS_CTR_BYTES_IN, |
| NS_CTR_BYTES_OUT, |
| NS_CTR_BLOCKED, |
| NS_CTR_DEAD, |
| NS_CTR_REPLACED, |
| NS_CTR_NSEI_CHG, |
| NS_CTR_INV_VCI, |
| NS_CTR_INV_NSEI, |
| NS_CTR_LOST_ALIVE, |
| NS_CTR_LOST_RESET, |
| }; |
| |
| static const struct rate_ctr_desc nsvc_ctr_description[] = { |
| { "packets:in", "Packets at NS Level ( In)" }, |
| { "packets:out","Packets at NS Level (Out)" }, |
| { "bytes:in", "Bytes at NS Level ( In)" }, |
| { "bytes:out", "Bytes at NS Level (Out)" }, |
| { "blocked", "NS-VC Block count " }, |
| { "dead", "NS-VC gone dead count " }, |
| { "replaced", "NS-VC replaced other count" }, |
| { "nsei-chg", "NS-VC changed NSEI count " }, |
| { "inv-nsvci", "NS-VCI was invalid count " }, |
| { "inv-nsei", "NSEI was invalid count " }, |
| { "lost:alive", "ALIVE ACK missing count " }, |
| { "lost:reset", "RESET ACK missing count " }, |
| }; |
| |
| static const struct rate_ctr_group_desc nsvc_ctrg_desc = { |
| .group_name_prefix = "ns:nsvc", |
| .group_description = "NSVC Peer Statistics", |
| .num_ctr = ARRAY_SIZE(nsvc_ctr_description), |
| .ctr_desc = nsvc_ctr_description, |
| .class_id = OSMO_STATS_CLASS_PEER, |
| }; |
| |
| enum ns_stat { |
| NS_STAT_ALIVE_DELAY, |
| }; |
| |
| static const struct osmo_stat_item_desc nsvc_stat_description[] = { |
| { "alive.delay", "ALIVE response time ", "ms", 16, 0 }, |
| }; |
| |
| static const struct osmo_stat_item_group_desc nsvc_statg_desc = { |
| .group_name_prefix = "ns.nsvc", |
| .group_description = "NSVC Peer Statistics", |
| .num_items = ARRAY_SIZE(nsvc_stat_description), |
| .item_desc = nsvc_stat_description, |
| .class_id = OSMO_STATS_CLASS_PEER, |
| }; |
| |
| const struct value_string gprs_ns_signal_ns_names[] = { |
| { S_NS_RESET, "NS-RESET" }, |
| { S_NS_BLOCK, "NS-BLOCK" }, |
| { S_NS_UNBLOCK, "NS-UNBLOCK" }, |
| { S_NS_ALIVE_EXP, "NS-ALIVE expired" }, |
| { S_NS_REPLACED, "NSVC replaced" }, |
| { S_NS_MISMATCH, "Unexpected IE" }, |
| { S_SNS_CONFIGURED, "SNS Configured" }, |
| { 0, NULL } |
| }; |
| |
| #define CHECK_TX_RC(rc, nsvc) \ |
| if (rc < 0) \ |
| LOGP(DNS, LOGL_ERROR, "TX failed (%d) to peer %s\n", \ |
| rc, gprs_ns_ll_str(nsvc)); |
| |
| static bool nsvc_is_not_used(const struct gprs_nsvc *nsvc) |
| { |
| if (nsvc->data_weight == 0 && nsvc->sig_weight == 0) |
| return true; |
| else |
| return false; |
| } |
| |
| struct msgb *gprs_ns_msgb_alloc(void) |
| { |
| struct msgb *msg = msgb_alloc_headroom(NS_ALLOC_SIZE, NS_ALLOC_HEADROOM, |
| "GPRS/NS"); |
| if (!msg) { |
| LOGP(DNS, LOGL_ERROR, "Failed to allocate NS message of size %d\n", |
| NS_ALLOC_SIZE); |
| } |
| return msg; |
| } |
| |
| /* FIXME: convert to osmo_fsm */ |
| static inline void ns_set_state_with_log(struct gprs_nsvc *nsvc, uint32_t state, bool is_remote, |
| const char *file, unsigned line) |
| { |
| uint32_t old_state = is_remote ? nsvc->remote_state : nsvc->state; |
| |
| LOGPSRC(DNS, LOGL_DEBUG, file, line, "NSEI %d (NS-VCI=%u) setting %sstate [%s,%s,%s] -> [%s,%s,%s]\n", |
| nsvc->nsei, nsvc->nsvci, is_remote ? "remote " : "", |
| NS_DESC_A(old_state), NS_DESC_B(old_state), NS_DESC_R(old_state), |
| NS_DESC_A(state), NS_DESC_B(state), NS_DESC_R(state)); |
| |
| if (is_remote) |
| nsvc->remote_state = state; |
| else |
| nsvc->state = state; |
| } |
| |
| /*! Lookup struct gprs_nsvc based on NSVCI |
| * \param[in] nsi NS instance in which to search |
| * \param[in] nsvci NSVCI to be searched |
| * \returns gprs_nsvc of respective NSVCI |
| */ |
| struct gprs_nsvc *gprs_nsvc_by_nsvci(struct gprs_ns_inst *nsi, uint16_t nsvci) |
| { |
| struct gprs_nsvc *nsvc; |
| llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| if (nsvc->nsvci == nsvci) |
| return nsvc; |
| } |
| return NULL; |
| } |
| |
| /*! Lookup struct gprs_nsvc based on NSEI |
| * \param[in] nsi NS instance in which to search |
| * \param[in] nsei NSEI to be searched |
| * \returns first gprs_nsvc of respective NSEI |
| */ |
| struct gprs_nsvc *gprs_nsvc_by_nsei(struct gprs_ns_inst *nsi, uint16_t nsei) |
| { |
| struct gprs_nsvc *nsvc; |
| llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| if (nsvc->nsei == nsei) |
| return nsvc; |
| } |
| return NULL; |
| } |
| |
| /*! Determine active NS-VC for given NSEI + BVCI. |
| * Use this function to determine which of the NS-VCs inside the NS Instance |
| * shall be used to transmit data for given NSEI + BVCI */ |
| static struct gprs_nsvc *gprs_active_nsvc_by_nsei(struct gprs_ns_inst *nsi, |
| uint16_t nsei, uint16_t bvci) |
| { |
| struct gprs_nsvc *nsvc; |
| llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| /* if signalling BVCI, skip any NSVC with signalling weight == 0 */ |
| if (bvci == 0 && nsvc->sig_weight == 0) |
| continue; |
| /* if point-to-point BVCI, skip any NSVC with data weight == 0 */ |
| if (bvci != 0 && nsvc->data_weight == 0) |
| continue; |
| if (nsvc->nsei == nsei) { |
| if (!(nsvc->state & NSE_S_BLOCKED) && |
| nsvc->state & NSE_S_ALIVE) |
| return nsvc; |
| } |
| } |
| return NULL; |
| } |
| |
| /*! Lookup NS-VC based on specified remote peer socket addr. |
| * \param[in] nsi NS Instance within which we shall look up the NS-VC |
| * \param[in] sin Remote peer Socket Address (IP + UDP Port) |
| * \returns NS-VC matching the given peer; NULL in case of none */ |
| struct gprs_nsvc *gprs_nsvc_by_rem_addr(struct gprs_ns_inst *nsi, const struct sockaddr_in *sin) |
| { |
| struct gprs_nsvc *nsvc; |
| llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| if (nsvc->ip.bts_addr.sin_addr.s_addr == |
| sin->sin_addr.s_addr && |
| nsvc->ip.bts_addr.sin_port == sin->sin_port) |
| return nsvc; |
| } |
| return NULL; |
| } |
| |
| static void gprs_ns_timer_cb(void *data); |
| |
| /*! Create a new NS-VC (Virtual Circuit) within given instance |
| * \param[in] nsi NS Instance in which to create the NSVC |
| * \param[in] nsvci] NS Virtual Connection Identifier for this NSVC |
| * \param[in] sig_weight Signalling Weight of this NS-VC. Use "0" for no signalling |
| * \param[in] data_weight Data WEight of this NS-VC. Use "0" for no data |
| * \returns newly-created gprs_nsvc within nsi. NULL on error. */ |
| struct gprs_nsvc *gprs_nsvc_create2(struct gprs_ns_inst *nsi, uint16_t nsvci, |
| uint8_t sig_weight, uint8_t data_weight) |
| { |
| struct gprs_nsvc *nsvc; |
| |
| if (gprs_nsvc_by_nsvci(nsi, nsvci)) { |
| LOGP(DNS, LOGL_ERROR, "Cannot create NS-VC for already-existing NSVCI=%u\n", nsvci); |
| return NULL; |
| } |
| |
| LOGP(DNS, LOGL_INFO, "NSVCI=%u Creating NS-VC with Signal weight %u, Data weight %u\n", |
| nsvci, sig_weight, data_weight); |
| |
| nsvc = talloc_zero(nsi, struct gprs_nsvc); |
| if (!nsvc) |
| return NULL; |
| nsvc->nsvci = nsvci; |
| nsvc->nsvci_is_valid = 1; |
| /* before RESET procedure: BLOCKED and DEAD */ |
| if (nsi->bss_sns_fi || !nsi->nsip.use_reset_block_unblock) |
| ns_set_state(nsvc, 0); |
| else |
| ns_set_state(nsvc, NSE_S_BLOCKED); |
| nsvc->nsi = nsi; |
| osmo_timer_setup(&nsvc->timer, gprs_ns_timer_cb, nsvc); |
| nsvc->ctrg = rate_ctr_group_alloc(nsvc, &nsvc_ctrg_desc, nsvci); |
| if (!nsvc->ctrg) { |
| talloc_free(nsvc); |
| return NULL; |
| } |
| nsvc->statg = osmo_stat_item_group_alloc(nsvc, &nsvc_statg_desc, nsvci); |
| nsvc->sig_weight = sig_weight; |
| nsvc->data_weight = data_weight; |
| |
| llist_add(&nsvc->list, &nsi->gprs_nsvcs); |
| |
| return nsvc; |
| } |
| |
| /*! Delete given NS-VC |
| * \param[in] nsvc gprs_nsvc to be deleted |
| */ |
| void gprs_nsvc_delete(struct gprs_nsvc *nsvc) |
| { |
| if (osmo_timer_pending(&nsvc->timer)) |
| osmo_timer_del(&nsvc->timer); |
| llist_del(&nsvc->list); |
| rate_ctr_group_free(nsvc->ctrg); |
| osmo_stat_item_group_free(nsvc->statg); |
| talloc_free(nsvc); |
| } |
| |
| static void ns_osmo_signal_dispatch(struct gprs_nsvc *nsvc, unsigned int signal, |
| uint8_t cause) |
| { |
| struct ns_signal_data nssd = {0}; |
| |
| nssd.nsvc = nsvc; |
| nssd.cause = cause; |
| |
| osmo_signal_dispatch(SS_L_NS, signal, &nssd); |
| } |
| |
| static void ns_osmo_signal_dispatch_mismatch(struct gprs_nsvc *nsvc, |
| struct msgb *msg, |
| uint8_t pdu_type, uint8_t ie_type) |
| { |
| struct ns_signal_data nssd = {0}; |
| |
| nssd.nsvc = nsvc; |
| nssd.pdu_type = pdu_type; |
| nssd.ie_type = ie_type; |
| nssd.msg = msg; |
| |
| osmo_signal_dispatch(SS_L_NS, S_NS_MISMATCH, &nssd); |
| } |
| |
| static void ns_osmo_signal_dispatch_replaced(struct gprs_nsvc *nsvc, struct gprs_nsvc *old_nsvc) |
| { |
| struct ns_signal_data nssd = {0}; |
| |
| nssd.nsvc = nsvc; |
| nssd.old_nsvc = old_nsvc; |
| |
| osmo_signal_dispatch(SS_L_NS, S_NS_REPLACED, &nssd); |
| } |
| |
| const struct value_string gprs_ns_pdu_strings[] = { |
| /* 3GPP TS 48.016 §9.2 Network Service Control PDUs */ |
| { NS_PDUT_UNITDATA, "NS-UNITDATA" }, /* §9.2.1 */ |
| { NS_PDUT_RESET, "NS-RESET" }, /* §9.2.5 */ |
| { NS_PDUT_RESET_ACK, "NS-RESET-ACK" }, /* §9.2.6 */ |
| { NS_PDUT_BLOCK, "NS-BLOCK" }, /* §9.2.3 */ |
| { NS_PDUT_BLOCK_ACK, "NS-BLOCK-ACK" }, /* §9.2.4 */ |
| { NS_PDUT_UNBLOCK, "NS-UNBLOCK" }, /* §9.2.8 */ |
| { NS_PDUT_UNBLOCK_ACK, "NS-UNBLOCK-ACK" }, /* §9.2.9 */ |
| { NS_PDUT_STATUS, "NS-STATUS" }, /* §9.2.7 */ |
| { NS_PDUT_ALIVE, "NS-ALIVE" }, /* §9.2.1 */ |
| { NS_PDUT_ALIVE_ACK, "NS-ALIVE-ACK" }, /* §9.2.2 */ |
| /* 3GPP TS 48.016 §9.3 Sub-Network Service Control PDUs */ |
| { SNS_PDUT_ACK, "SNS-ACK" }, /* §9.3.1 */ |
| { SNS_PDUT_ADD, "SNS-ADD" }, /* §9.3.2 */ |
| { SNS_PDUT_CHANGE_WEIGHT, "SNS-CHANGEWEIGHT" }, /* §9.3.3 */ |
| { SNS_PDUT_CONFIG, "SNS-CONFIG" }, /* §9.3.4 */ |
| { SNS_PDUT_CONFIG_ACK, "SNS-CONFIG-ACK" }, /* §9.3.5 */ |
| { SNS_PDUT_DELETE, "SNS-DELETE" }, /* §9.3.6 */ |
| { SNS_PDUT_SIZE, "SNS-SIZE" }, /* §9.3.7 */ |
| { SNS_PDUT_SIZE_ACK, "SNS-SIZE-ACK" }, /* §9.3.8 */ |
| { 0, NULL } |
| }; |
| |
| /* Section 10.3.2, Table 13 */ |
| static const struct value_string ns_cause_str[] = { |
| { NS_CAUSE_TRANSIT_FAIL, "Transit network failure" }, |
| { NS_CAUSE_OM_INTERVENTION, "O&M intervention" }, |
| { NS_CAUSE_EQUIP_FAIL, "Equipment failure" }, |
| { NS_CAUSE_NSVC_BLOCKED, "NS-VC blocked" }, |
| { NS_CAUSE_NSVC_UNKNOWN, "NS-VC unknown" }, |
| { NS_CAUSE_BVCI_UNKNOWN, "BVCI unknown" }, |
| { NS_CAUSE_SEM_INCORR_PDU, "Semantically incorrect PDU" }, |
| { NS_CAUSE_PDU_INCOMP_PSTATE, "PDU not compatible with protocol state" }, |
| { NS_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
| { NS_CAUSE_INVAL_ESSENT_IE, "Invalid essential IE" }, |
| { NS_CAUSE_MISSING_ESSENT_IE, "Missing essential IE" }, |
| { NS_CAUSE_INVAL_NR_IPv4_EP, "Invalid Number of IPv4 Endpoints" }, |
| { NS_CAUSE_INVAL_NR_IPv6_EP, "Invalid Number of IPv6 Endpoints" }, |
| { NS_CAUSE_INVAL_NR_NS_VC, "Invalid Number of NS-VCs" }, |
| { NS_CAUSE_INVAL_WEIGH, "Invalid Weights" }, |
| { NS_CAUSE_UNKN_IP_EP, "Unknown IP Endpoint" }, |
| { NS_CAUSE_UNKN_IP_ADDR, "Unknown IP Address" }, |
| { NS_CAUSE_UNKN_IP_TEST_FAILED, "IP Test Failed" }, |
| { 0, NULL } |
| }; |
| |
| /*! Obtain a human-readable string for NS cause value */ |
| const char *gprs_ns_cause_str(enum ns_cause cause) |
| { |
| return get_value_string(ns_cause_str, 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 bool ns_is_sns(uint8_t pdu_type) |
| { |
| switch (pdu_type) { |
| case SNS_PDUT_CONFIG: |
| case SNS_PDUT_ACK: |
| case SNS_PDUT_ADD: |
| case SNS_PDUT_CHANGE_WEIGHT: |
| case SNS_PDUT_DELETE: |
| case SNS_PDUT_CONFIG_ACK: |
| case SNS_PDUT_SIZE: |
| case SNS_PDUT_SIZE_ACK: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| int ret; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| /* A pre-configured endpoint shall not be used for NSE data or signalling |
| * traffic (with the exception of Size and Configuration procedures) unless it |
| * is configured by the SGSN using the auto-configuration procedures. */ |
| if (nsvc_is_not_used(nsvc) && !ns_is_sns(nsh->pdu_type) && nsh->pdu_type != NS_PDUT_STATUS) { |
| LOGP(DNS, LOGL_NOTICE, "Not transmitting %s on unused/pre-configured endpoint\n", |
| get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| msgb_free(msg); |
| return -EINVAL; |
| } |
| |
| /* Increment number of Uplink bytes */ |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_PKTS_OUT)); |
| rate_ctr_add(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_BYTES_OUT), msgb_l2len(msg)); |
| |
| switch (nsvc->ll) { |
| case GPRS_NS_LL_UDP: |
| ret = nsip_sendmsg(nsvc, msg); |
| if (ret < 0) |
| LOGP(DNS, LOGL_INFO, |
| "failed to send NS message via UDP: %s\n", |
| strerror(-ret)); |
| break; |
| case GPRS_NS_LL_FR_GRE: |
| ret = gprs_ns_frgre_sendmsg(nsvc, msg); |
| if (ret < 0) |
| LOGP(DNS, LOGL_INFO, |
| "failed to send NS message via FR/GRE: %s\n", |
| strerror(-ret)); |
| break; |
| default: |
| LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->ll); |
| msgb_free(msg); |
| ret = -EIO; |
| break; |
| } |
| return ret; |
| } |
| |
| static int gprs_ns_tx_simple(struct gprs_nsvc *nsvc, uint8_t pdu_type) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = pdu_type; |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-RESET on a given NSVC |
| * \param[in] nsvc NS-VC used for transmission |
| * \paam[in] cause Numeric NS cause value |
| */ |
| int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| uint16_t nsei = osmo_htons(nsvc->nsei); |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET"); |
| |
| msg = gprs_ns_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS RESET (NSVCI=%u, cause=%s)\n", |
| nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause)); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_RESET; |
| |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *) &nsei); |
| |
| return gprs_ns_tx(nsvc, msg); |
| |
| } |
| |
| /*! Transmit a NS-STATUS on a given NSVC |
| * \param[in] nsvc NS-VC to be used for transmission |
| * \param[in] cause Numeric NS cause value |
| * \param[in] bvci BVCI to be reset within NSVC |
| * \param[in] orig_msg message causing the STATUS */ |
| int gprs_ns_tx_status(struct gprs_nsvc *nsvc, uint8_t cause, |
| uint16_t bvci, struct msgb *orig_msg) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| bvci = osmo_htons(bvci); |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| LOGP(DNS, LOGL_NOTICE, "NSEI=%u Tx NS STATUS (NSVCI=%u, cause=%s)\n", |
| nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause)); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_STATUS; |
| |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| |
| /* Section 9.2.7.1: Static conditions for NS-VCI */ |
| if (cause == NS_CAUSE_NSVC_BLOCKED || |
| cause == NS_CAUSE_NSVC_UNKNOWN) |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| |
| /* Section 9.2.7.2: Static conditions for NS PDU */ |
| switch (cause) { |
| case NS_CAUSE_SEM_INCORR_PDU: |
| case NS_CAUSE_PDU_INCOMP_PSTATE: |
| case NS_CAUSE_PROTO_ERR_UNSPEC: |
| case NS_CAUSE_INVAL_ESSENT_IE: |
| case NS_CAUSE_MISSING_ESSENT_IE: |
| msgb_tvlv_put(msg, NS_IE_PDU, msgb_l2len(orig_msg), |
| orig_msg->l2h); |
| break; |
| default: |
| break; |
| } |
| |
| /* Section 9.2.7.3: Static conditions for BVCI */ |
| if (cause == NS_CAUSE_BVCI_UNKNOWN) |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&bvci); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-BLOCK on a given NS-VC |
| * \param[in] nsvc NS-VC on which the NS-BLOCK is to be transmitted |
| * \param[in] cause Numeric NS Cause value |
| * \returns 0 in case of success |
| */ |
| int gprs_ns_tx_block(struct gprs_nsvc *nsvc, uint8_t cause) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK"); |
| |
| msg = gprs_ns_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS BLOCK (NSVCI=%u, cause=%s)\n", |
| nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause)); |
| |
| /* be conservative and mark it as blocked even now! */ |
| ns_mark_blocked(nsvc); |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_BLOCKED)); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_BLOCK; |
| |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-BLOCK-ACK on a given NS-VC |
| * \param[in] nsvc NS-VC on which the NS-BLOCK is to be transmitted |
| * \returns 0 in case of success |
| */ |
| static int gprs_ns_tx_block_ack(struct gprs_nsvc *nsvc) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK ACK"); |
| |
| msg = gprs_ns_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS BLOCK ACK (NSVCI=%u)\n", nsvc->nsei, nsvc->nsvci); |
| |
| /* be conservative and mark it as blocked even now! */ |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| nsh->pdu_type = NS_PDUT_BLOCK_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Transmit a NS-UNBLOCK on a given NS-VC |
| * \param[in] nsvc NS-VC on which the NS-UNBLOCK is to be transmitted |
| * \returns 0 in case of success |
| */ |
| int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS UNBLOCK"); |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n", |
| nsvc->nsei, nsvc->nsvci); |
| |
| return gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK); |
| } |
| |
| /*! Transmit a NS-ALIVE on a given NS-VC |
| * \param[in] nsvc NS-VC on which the NS-ALIVE is to be transmitted |
| * \returns 0 in case of success |
| */ |
| int gprs_ns_tx_alive(struct gprs_nsvc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE (NSVCI=%u)\n", |
| nsvc->nsei, nsvc->nsvci); |
| |
| return gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE); |
| } |
| |
| /*! Transmit a NS-ALIVE-ACK on a given NS-VC |
| * \param[in] nsvc NS-VC on which the NS-ALIVE-ACK is to be transmitted |
| * \returns 0 in case of success |
| */ |
| int gprs_ns_tx_alive_ack(struct gprs_nsvc *nsvc) |
| { |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE_ACK (NSVCI=%u)\n", |
| nsvc->nsei, nsvc->nsvci); |
| |
| return gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE_ACK); |
| } |
| |
| static const enum ns_timeout timer_mode_tout[_NSVC_TIMER_NR] = { |
| [NSVC_TIMER_TNS_RESET] = NS_TOUT_TNS_RESET, |
| [NSVC_TIMER_TNS_ALIVE] = NS_TOUT_TNS_ALIVE, |
| [NSVC_TIMER_TNS_TEST] = NS_TOUT_TNS_TEST, |
| }; |
| |
| static const struct value_string timer_mode_strs[] = { |
| { NSVC_TIMER_TNS_RESET, "tns-reset" }, |
| { NSVC_TIMER_TNS_ALIVE, "tns-alive" }, |
| { NSVC_TIMER_TNS_TEST, "tns-test" }, |
| { 0, NULL } |
| }; |
| |
| static void nsvc_start_timer(struct gprs_nsvc *nsvc, enum nsvc_timer_mode mode) |
| { |
| enum ns_timeout tout = timer_mode_tout[mode]; |
| unsigned int seconds = nsvc->nsi->timeout[tout]; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| DEBUGP(DNS, "NSEI=%u Starting timer in mode %s (%u seconds)\n", |
| nsvc->nsei, get_value_string(timer_mode_strs, mode), |
| seconds); |
| |
| if (osmo_timer_pending(&nsvc->timer)) |
| osmo_timer_del(&nsvc->timer); |
| |
| osmo_gettimeofday(&nsvc->timer_started, NULL); |
| nsvc->timer_mode = mode; |
| osmo_timer_schedule(&nsvc->timer, seconds, 0); |
| } |
| |
| static int nsvc_timer_elapsed_ms(struct gprs_nsvc *nsvc) |
| { |
| struct timeval now, elapsed; |
| osmo_gettimeofday(&now, NULL); |
| timersub(&now, &nsvc->timer_started, &elapsed); |
| |
| return 1000 * elapsed.tv_sec + elapsed.tv_usec / 1000; |
| } |
| |
| static void gprs_ns_timer_cb(void *data) |
| { |
| struct gprs_nsvc *nsvc = data; |
| enum ns_timeout tout = timer_mode_tout[nsvc->timer_mode]; |
| unsigned int seconds = nsvc->nsi->timeout[tout]; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| DEBUGP(DNS, "NSEI=%u Timer expired in mode %s (%u seconds)\n", |
| nsvc->nsei, get_value_string(timer_mode_strs, nsvc->timer_mode), |
| seconds); |
| |
| switch (nsvc->timer_mode) { |
| case NSVC_TIMER_TNS_ALIVE: |
| /* Tns-alive case: we expired without response ! */ |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_LOST_ALIVE)); |
| nsvc->alive_retries++; |
| if (nsvc->alive_retries > |
| nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]) { |
| /* mark as dead (and blocked unless IP-SNS) */ |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_DEAD)); |
| if (!nsvc->nsi->bss_sns_fi && nsvc->nsi->nsip.use_reset_block_unblock) { |
| ns_set_state(nsvc, NSE_S_BLOCKED); |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_BLOCKED)); |
| } else |
| ns_set_state(nsvc, 0); |
| LOGP(DNS, LOGL_NOTICE, |
| "NSEI=%u Tns-alive expired more then " |
| "%u times, blocking NS-VC\n", nsvc->nsei, |
| nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]); |
| ns_osmo_signal_dispatch(nsvc, S_NS_ALIVE_EXP, 0); |
| /* FIXME: should we send this signal in case of SNS? */ |
| if (!nsvc->nsi->bss_sns_fi && nsvc->nsi->nsip.use_reset_block_unblock) |
| ns_osmo_signal_dispatch(nsvc, S_NS_BLOCK, NS_CAUSE_NSVC_BLOCKED); |
| return; |
| } |
| /* Tns-test case: send NS-ALIVE PDU */ |
| gprs_ns_tx_alive(nsvc); |
| /* start Tns-alive timer */ |
| nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); |
| break; |
| case NSVC_TIMER_TNS_TEST: |
| /* Tns-test case: send NS-ALIVE PDU */ |
| gprs_ns_tx_alive(nsvc); |
| /* start Tns-alive timer (transition into faster |
| * alive retransmissions) */ |
| nsvc->alive_retries = 0; |
| nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); |
| break; |
| case NSVC_TIMER_TNS_RESET: |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_LOST_RESET)); |
| if (!(nsvc->state & NSE_S_RESET)) |
| LOGP(DNS, LOGL_NOTICE, |
| "NSEI=%u Reset timed out but RESET flag is not set\n", |
| nsvc->nsei); |
| /* Mark NS-VC locally as blocked and dead */ |
| ns_set_state(nsvc, NSE_S_BLOCKED | NSE_S_RESET); |
| /* Chapter 7.3: Re-send the RESET */ |
| gprs_ns_tx_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| /* Re-start Tns-reset timer */ |
| nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET); |
| break; |
| case _NSVC_TIMER_NR: |
| break; |
| } |
| } |
| |
| /* Section 9.2.6 */ |
| static int gprs_ns_tx_reset_ack(struct gprs_nsvc *nsvc) |
| { |
| struct msgb *msg; |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsvci, nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET ACK"); |
| |
| msg = gprs_ns_msgb_alloc(); |
| if (!msg) |
| return -ENOMEM; |
| |
| nsvci = osmo_htons(nsvc->nsvci); |
| nsei = osmo_htons(nsvc->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = NS_PDUT_RESET_ACK; |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS RESET ACK (NSVCI=%u)\n", |
| nsvc->nsei, nsvc->nsvci); |
| |
| msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-ACK as per Section 9.3.1. |
| * \param[in] nsvc NS-VC through which to transmit the ACK |
| * \param[in] trans_id Transaction ID which to acknowledge |
| * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \returns 0 on success; negative in case of error */ |
| int gprs_ns_tx_sns_ack(struct gprs_nsvc *nsvc, uint8_t trans_id, uint8_t *cause, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nsi->bss_sns_fi) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| nsvc->nsei); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_ACK; |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| msgb_v_put(msg, trans_id); |
| if (cause) |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| if (ip4_elems) { |
| /* List of IP4 Elements 10.3.2c */ |
| msgb_tvlv_put(msg, NS_IE_IPv4_LIST, |
| num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| (const uint8_t *)ip4_elems); |
| } |
| /* FIXME: List of IP6 elements 10.3.2d */ |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-CONFIG as per Section 9.3.4. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| * \param[in] end_flag Whether or not this is the last SNS-CONFIG |
| * \param[in] ip4_elems Array of IPv4 Elements |
| * \param[in] num_ip4_elems number of ip4_elems |
| * \returns 0 on success; negative in case of error */ |
| int gprs_ns_tx_sns_config(struct gprs_nsvc *nsvc, bool end_flag, |
| const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| unsigned int num_ip4_elems) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nsi->bss_sns_fi) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| nsvc->nsei); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_CONFIG; |
| |
| msgb_v_put(msg, end_flag ? 0x01 : 0x00); |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| |
| /* List of IP4 Elements 10.3.2c */ |
| msgb_tvlv_put(msg, NS_IE_IPv4_LIST, num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| (const uint8_t *)ip4_elems); |
| /* FIXME: List of IP6 elements 10.3.2d */ |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-CONFIG-ACK as per Section 9.3.5. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG-ACK |
| * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| * \returns 0 on success; negative in case of error */ |
| int gprs_ns_tx_sns_config_ack(struct gprs_nsvc *nsvc, uint8_t *cause) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nsi->bss_sns_fi) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| nsvc->nsei); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_CONFIG_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| if (cause) |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| |
| /*! Encode + transmit a SNS-SIZE as per Section 9.3.7. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-SIZE |
| * \param[in] reset_flag Whether or not to add a RESET flag |
| * \param[in] max_nr_nsvc Maximum number of NS-VCs |
| * \param[in] ip4_ep_nr Number of IPv4 endpoints (NULL if none) |
| * \param[in] ip6_ep_nr Number of IPv6 endpoints (NULL if none) |
| * \returns 0 on success; negative in case of error */ |
| int gprs_ns_tx_sns_size(struct gprs_nsvc *nsvc, bool reset_flag, uint16_t max_nr_nsvc, |
| uint16_t *ip4_ep_nr, uint16_t *ip6_ep_nr) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nsi->bss_sns_fi) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| nsvc->nsei); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_SIZE; |
| |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| msgb_tv_put(msg, NS_IE_RESET_FLAG, reset_flag ? 0x01 : 0x00); |
| msgb_tv16_put(msg, NS_IE_MAX_NR_NSVC, max_nr_nsvc); |
| if (ip4_ep_nr) |
| msgb_tv16_put(msg, NS_IE_IPv4_EP_NR, *ip4_ep_nr); |
| if (ip6_ep_nr) |
| msgb_tv16_put(msg, NS_IE_IPv6_EP_NR, *ip6_ep_nr); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! Encode + Transmit a SNS-SIZE-ACK as per Section 9.3.8. |
| * \param[in] nsvc NS-VC through which to transmit the SNS-SIZE-ACK |
| * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| * \returns 0 on success; negative in case of error */ |
| int gprs_ns_tx_sns_size_ack(struct gprs_nsvc *nsvc, uint8_t *cause) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| struct gprs_ns_hdr *nsh; |
| uint16_t nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| if (!msg) |
| return -ENOMEM; |
| |
| if (!nsvc->nsi->bss_sns_fi) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| nsvc->nsei); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsei = osmo_htons(nsvc->nsei); |
| |
| msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| |
| nsh->pdu_type = SNS_PDUT_SIZE_ACK; |
| |
| msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| if (cause) |
| msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /*! High-level function for transmitting a NS-UNITDATA messsage |
| * \param[in] nsi NS-instance on which we shall transmit |
| * \param[in] msg struct msgb to be trasnmitted |
| * |
| * This function obtains the NS-VC by the msgb_nsei(msg) and then checks |
| * if the NS-VC is ALIVE and not BLOCKED. After that, it adds a NS |
| * header for the NS-UNITDATA message type and sends it off. |
| * |
| * Section 9.2.10: transmit side / NS-UNITDATA-REQUEST primitive |
| */ |
| int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg) |
| { |
| struct gprs_nsvc *nsvc; |
| struct gprs_ns_hdr *nsh; |
| uint16_t bvci = msgb_bvci(msg); |
| |
| nsvc = gprs_active_nsvc_by_nsei(nsi, msgb_nsei(msg), msgb_bvci(msg)); |
| if (!nsvc) { |
| int rc; |
| if (gprs_nsvc_by_nsei(nsi, msgb_nsei(msg))) { |
| LOGP(DNS, LOGL_ERROR, |
| "All NS-VCs for NSEI %u are either dead or blocked!\n", |
| msgb_nsei(msg)); |
| rc = -EBUSY; |
| } else { |
| LOGP(DNS, LOGL_ERROR, "Unable to resolve NSEI %u " |
| "to NS-VC!\n", msgb_nsei(msg)); |
| rc = -EINVAL; |
| } |
| |
| msgb_free(msg); |
| return rc; |
| } |
| log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| |
| msg->l2h = msgb_push(msg, sizeof(*nsh) + 3); |
| nsh = (struct gprs_ns_hdr *) msg->l2h; |
| if (!nsh) { |
| LOGP(DNS, LOGL_ERROR, "Not enough headroom for NS header\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| nsh->pdu_type = NS_PDUT_UNITDATA; |
| /* spare octet in data[0] */ |
| nsh->data[1] = bvci >> 8; |
| nsh->data[2] = bvci & 0xff; |
| |
| return gprs_ns_tx(nsvc, msg); |
| } |
| |
| /* Section 9.2.10: receive side */ |
| static int gprs_ns_rx_unitdata(struct gprs_nsvc *nsvc, struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h; |
| uint16_t bvci; |
| |
| if (nsvc->state & NSE_S_BLOCKED) |
| return gprs_ns_tx_status(nsvc, NS_CAUSE_NSVC_BLOCKED, |
| 0, msg); |
| |
| /* spare octet in data[0] */ |
| bvci = nsh->data[1] << 8 | nsh->data[2]; |
| msgb_bssgph(msg) = &nsh->data[3]; |
| msgb_bvci(msg) = bvci; |
| |
| /* call upper layer (BSSGP) */ |
| return nsvc->nsi->cb(GPRS_NS_EVT_UNIT_DATA, nsvc, msg, bvci); |
| } |
| |
| /* Section 9.2.7 */ |
| static int gprs_ns_rx_status(struct gprs_nsvc *nsvc, struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| struct tlv_parsed tp; |
| uint8_t cause; |
| int rc; |
| |
| LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx NS STATUS ", nsvc->nsei); |
| |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| if (rc < 0) { |
| LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse\n"); |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx NS STATUS: " |
| "Error during TLV Parse\n", nsvc->nsei); |
| return rc; |
| } |
| |
| if (!TLVP_PRESENT(&tp, NS_IE_CAUSE)) { |
| LOGPC(DNS, LOGL_INFO, "missing cause IE\n"); |
| return -EINVAL; |
| } |
| |
| cause = *TLVP_VAL(&tp, NS_IE_CAUSE); |
| LOGPC(DNS, LOGL_NOTICE, "cause=%s\n", gprs_ns_cause_str(cause)); |
| |
| return 0; |
| } |
| |
| /* Replace a nsvc object with another based on NSVCI. |
| * This function replaces looks for a NSVC with the given NSVCI and replaces it |
| * if possible and necessary. If replaced, the former value of *nsvc is |
| * returned in *old_nsvc. |
| * \return != 0 if *nsvc points to a matching NSVC. |
| */ |
| static int gprs_nsvc_replace_if_found(uint16_t nsvci, |
| struct gprs_nsvc **nsvc, |
| struct gprs_nsvc **old_nsvc) |
| { |
| struct gprs_nsvc *matching_nsvc; |
| |
| if ((*nsvc)->nsvci == nsvci) { |
| *old_nsvc = NULL; |
| return 1; |
| } |
| |
| matching_nsvc = gprs_nsvc_by_nsvci((*nsvc)->nsi, nsvci); |
| |
| if (!matching_nsvc) |
| return 0; |
| |
| /* The NS-VCI is already used by this NS-VC */ |
| |
| char *old_peer; |
| |
| /* Exchange the NS-VC objects */ |
| *old_nsvc = *nsvc; |
| *nsvc = matching_nsvc; |
| |
| /* Do logging */ |
| old_peer = talloc_strdup(*old_nsvc, gprs_ns_ll_str(*old_nsvc)); |
| LOGP(DNS, LOGL_INFO, "NS-VC changed link (NSVCI=%u) from %s to %s\n", |
| nsvci, old_peer, gprs_ns_ll_str(*nsvc)); |
| |
| talloc_free(old_peer); |
| |
| return 1; |
| } |
| |
| /* Section 7.3 */ |
| static int gprs_ns_rx_reset(struct gprs_nsvc **nsvc, struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| struct tlv_parsed tp; |
| uint8_t cause; |
| uint16_t nsvci, nsei; |
| struct gprs_nsvc *orig_nsvc = NULL; |
| int rc; |
| |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| if (rc < 0) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx NS RESET " |
| "Error during TLV Parse\n", (*nsvc)->nsei); |
| return rc; |
| } |
| |
| if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || |
| !TLVP_PRESENT(&tp, NS_IE_VCI) || |
| !TLVP_PRESENT(&tp, NS_IE_NSEI)) { |
| LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
| gprs_ns_tx_status(*nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg); |
| return -EINVAL; |
| } |
| |
| cause = *(uint8_t *) TLVP_VAL(&tp, NS_IE_CAUSE); |
| nsvci = tlvp_val16be(&tp, NS_IE_VCI); |
| nsei = tlvp_val16be(&tp, NS_IE_NSEI); |
| |
| LOGP(DNS, LOGL_INFO, "NSVCI=%u%s Rx NS RESET (NSEI=%u, NSVCI=%u, cause=%s)\n", |
| (*nsvc)->nsvci, (*nsvc)->nsvci_is_valid ? "" : "(invalid)", |
| nsei, nsvci, gprs_ns_cause_str(cause)); |
| |
| if ((*nsvc)->nsvci_is_valid && (*nsvc)->nsvci != nsvci) { |
| if ((*nsvc)->persistent || (*nsvc)->remote_end_is_sgsn) { |
| /* The incoming RESET doesn't match the NSVCI. Send an |
| * appropriate RESET_ACK and ignore the RESET. |
| * See 3GPP TS 08.16, 7.3.1, 2nd paragraph. |
| */ |
| ns_osmo_signal_dispatch_mismatch(*nsvc, msg, |
| NS_PDUT_RESET, |
| NS_IE_VCI); |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_INV_VCI)); |
| gprs_ns_tx_reset_ack(*nsvc); |
| return 0; |
| } |
| |
| /* NS-VCI has changed */ |
| if (!gprs_nsvc_replace_if_found(nsvci, nsvc, &orig_nsvc)) { |
| LOGP(DNS, LOGL_INFO, "Creating NS-VC %d replacing %d " |
| "at %s\n", |
| nsvci, (*nsvc)->nsvci, |
| gprs_ns_ll_str(*nsvc)); |
| orig_nsvc = *nsvc; |
| *nsvc = gprs_nsvc_create2((*nsvc)->nsi, nsvci, 1, 1); |
| (*nsvc)->nsei = nsei; |
| } |
| } |
| |
| if ((*nsvc)->nsvci_is_valid && (*nsvc)->nsei != nsei) { |
| if ((*nsvc)->persistent || (*nsvc)->remote_end_is_sgsn) { |
| /* The incoming RESET doesn't match the NSEI. Send an |
| * appropriate RESET_ACK and ignore the RESET. |
| * See 3GPP TS 08.16, 7.3.1, 3rd paragraph. |
| */ |
| ns_osmo_signal_dispatch_mismatch(*nsvc, msg, |
| NS_PDUT_RESET, |
| NS_IE_NSEI); |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_INV_NSEI)); |
| rc = gprs_ns_tx_reset_ack(*nsvc); |
| CHECK_TX_RC(rc, *nsvc); |
| return 0; |
| } |
| |
| /* NSEI has changed */ |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_NSEI_CHG)); |
| (*nsvc)->nsei = nsei; |
| } |
| |
| /* Mark NS-VC as blocked and alive */ |
| ns_set_state(*nsvc, NSE_S_BLOCKED | NSE_S_ALIVE); |
| |
| if (orig_nsvc) { |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_REPLACED)); |
| ns_osmo_signal_dispatch_replaced(*nsvc, orig_nsvc); |
| |
| /* Update the ll info fields */ |
| gprs_ns_ll_copy(*nsvc, orig_nsvc); |
| gprs_ns_ll_clear(orig_nsvc); |
| } else { |
| (*nsvc)->nsei = nsei; |
| (*nsvc)->nsvci = nsvci; |
| (*nsvc)->nsvci_is_valid = 1; |
| rate_ctr_group_upd_idx((*nsvc)->ctrg, nsvci); |
| osmo_stat_item_group_udp_idx((*nsvc)->statg, nsvci); |
| } |
| |
| /* inform interested parties about the fact that this NSVC |
| * has received RESET */ |
| ns_osmo_signal_dispatch(*nsvc, S_NS_RESET, cause); |
| |
| rc = gprs_ns_tx_reset_ack(*nsvc); |
| |
| /* start the test procedure */ |
| gprs_nsvc_start_test(*nsvc); |
| |
| return rc; |
| } |
| |
| static int gprs_ns_rx_reset_ack(struct gprs_nsvc **nsvc, struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| struct tlv_parsed tp; |
| uint16_t nsvci, nsei; |
| struct gprs_nsvc *orig_nsvc = NULL; |
| int rc; |
| |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| if (rc < 0) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx NS RESET ACK " |
| "Error during TLV Parse\n", (*nsvc)->nsei); |
| return rc; |
| } |
| |
| if (!TLVP_PRESENT(&tp, NS_IE_VCI) || |
| !TLVP_PRESENT(&tp, NS_IE_NSEI)) { |
| LOGP(DNS, LOGL_ERROR, "NS RESET ACK Missing mandatory IE\n"); |
| rc = gprs_ns_tx_status(*nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg); |
| CHECK_TX_RC(rc, *nsvc); |
| return -EINVAL; |
| } |
| |
| nsvci = tlvp_val16be(&tp, NS_IE_VCI); |
| nsei = tlvp_val16be(&tp, NS_IE_NSEI); |
| |
| LOGP(DNS, LOGL_INFO, "NSVCI=%u%s Rx NS RESET ACK (NSEI=%u, NSVCI=%u)\n", |
| (*nsvc)->nsvci, (*nsvc)->nsvci_is_valid ? "" : "(invalid)", |
| nsei, nsvci); |
| |
| if (!((*nsvc)->state & NSE_S_RESET)) { |
| /* Not waiting for a RESET_ACK on this NS-VC, ignore it. |
| * See 3GPP TS 08.16, 7.3.1, 5th paragraph. |
| */ |
| LOGP(DNS, LOGL_ERROR, |
| "NS RESET ACK Discarding unexpected message for " |
| "NS-VCI %d from SGSN NSEI=%d\n", |
| nsvci, nsei); |
| return 0; |
| } |
| |
| if (!(*nsvc)->nsvci_is_valid) { |
| LOGP(DNS, LOGL_NOTICE, |
| "NS RESET ACK Uninitialised NS-VC (%u) for " |
| "NS-VCI %d, NSEI=%d from %s\n", |
| (*nsvc)->nsvci, nsvci, nsei, gprs_ns_ll_str(*nsvc)); |
| return -EINVAL; |
| } |
| |
| if ((*nsvc)->nsvci != nsvci) { |
| /* NS-VCI has changed */ |
| |
| /* if !0, use another NSVC object that matches the NSVCI */ |
| int use_other_nsvc; |
| |
| /* Only do this with BSS peers */ |
| use_other_nsvc = !(*nsvc)->remote_end_is_sgsn && |
| !(*nsvc)->persistent; |
| |
| if (use_other_nsvc) |
| /* Update *nsvc to point to the right NSVC object */ |
| use_other_nsvc = gprs_nsvc_replace_if_found(nsvci, nsvc, |
| &orig_nsvc); |
| |
| if (!use_other_nsvc) { |
| /* The incoming RESET_ACK doesn't match the NSVCI. |
| * See 3GPP TS 08.16, 7.3.1, 4th paragraph. |
| */ |
| ns_osmo_signal_dispatch_mismatch(*nsvc, msg, |
| NS_PDUT_RESET_ACK, |
| NS_IE_VCI); |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_INV_VCI)); |
| LOGP(DNS, LOGL_ERROR, |
| "NS RESET ACK Unknown NS-VCI %d (%s NSEI=%d) " |
| "from %s\n", |
| nsvci, |
| (*nsvc)->remote_end_is_sgsn ? "SGSN" : "BSS", |
| nsei, gprs_ns_ll_str(*nsvc)); |
| return -EINVAL; |
| } |
| |
| /* Notify others */ |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_REPLACED)); |
| ns_osmo_signal_dispatch_replaced(*nsvc, orig_nsvc); |
| |
| /* Update the ll info fields */ |
| gprs_ns_ll_copy(*nsvc, orig_nsvc); |
| gprs_ns_ll_clear(orig_nsvc); |
| } else if ((*nsvc)->nsei != nsei) { |
| if ((*nsvc)->persistent || (*nsvc)->remote_end_is_sgsn) { |
| /* The incoming RESET_ACK doesn't match the NSEI. |
| * See 3GPP TS 08.16, 7.3.1, 4th paragraph. |
| */ |
| ns_osmo_signal_dispatch_mismatch(*nsvc, msg, |
| NS_PDUT_RESET_ACK, |
| NS_IE_NSEI); |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_INV_NSEI)); |
| LOGP(DNS, LOGL_ERROR, |
| "NS RESET ACK Unknown NSEI %d (NS-VCI=%u) from %s\n", |
| nsei, nsvci, gprs_ns_ll_str(*nsvc)); |
| return -EINVAL; |
| } |
| |
| /* NSEI has changed */ |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_NSEI_CHG)); |
| (*nsvc)->nsei = nsei; |
| } |
| |
| /* Mark NS-VC as blocked and alive */ |
| ns_set_state(*nsvc, NSE_S_BLOCKED | NSE_S_ALIVE); |
| ns_set_remote_state(*nsvc, NSE_S_BLOCKED | NSE_S_ALIVE); |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_BLOCKED)); |
| if ((*nsvc)->persistent || (*nsvc)->remote_end_is_sgsn) { |
| /* stop RESET timer */ |
| osmo_timer_del(&(*nsvc)->timer); |
| } |
| /* Initiate TEST proc.: Send ALIVE and start timer */ |
| gprs_nsvc_start_test(*nsvc); |
| |
| return 0; |
| } |
| |
| static int gprs_ns_rx_block(struct gprs_nsvc *nsvc, struct msgb *msg) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| struct tlv_parsed tp; |
| uint8_t *cause; |
| int rc; |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS BLOCK\n", nsvc->nsei); |
| |
| ns_mark_blocked(nsvc); |
| |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| if (rc < 0) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx NS BLOCK " |
| "Error during TLV Parse\n", nsvc->nsei); |
| return rc; |
| } |
| |
| if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || |
| !TLVP_PRESENT(&tp, NS_IE_VCI)) { |
| LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
| gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg); |
| return -EINVAL; |
| } |
| |
| cause = (uint8_t *) TLVP_VAL(&tp, NS_IE_CAUSE); |
| //nsvci = (uint16_t *) TLVP_VAL(&tp, NS_IE_VCI); |
| |
| ns_osmo_signal_dispatch(nsvc, S_NS_BLOCK, *cause); |
| rate_ctr_inc(rate_ctr_group_get_ctr(nsvc->ctrg, NS_CTR_BLOCKED)); |
| |
| return gprs_ns_tx_block_ack(nsvc); |
| } |
| |
| int gprs_ns_vc_create(struct gprs_ns_inst *nsi, struct msgb *msg, |
| struct gprs_nsvc *fallback_nsvc, |
| struct gprs_nsvc **new_nsvc); |
| |
| int gprs_ns_process_msg(struct gprs_ns_inst *nsi, struct msgb *msg, |
| struct gprs_nsvc **nsvc); |
| |
| /*! Receive incoming NS message from underlying transport layer |
| * \param nsi NS instance to which the data belongs |
| * \param[in] msg message buffer containing newly-received data |
| * \param[in] saddr socketaddr from which data was received |
| * \param[in] ll link-layer type in which data was received |
| * \returns 0 in case of success, < 0 in case of error |
| * |
| * This is the main entry point int othe NS imlementation where frames |
| * from the underlying transport (normally UDP) enter. |
| */ |
| int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, |
| struct sockaddr_in *saddr, enum gprs_ns_ll ll) |
| { |
| struct gprs_nsvc *nsvc; |
| int rc = 0; |
| |
| /* look up the NSVC based on source address */ |
| nsvc = gprs_nsvc_by_rem_addr(nsi, saddr); |
| |
| if (!nsvc) { |
| struct gprs_nsvc *fallback_nsvc; |
| |
| fallback_nsvc = nsi->unknown_nsvc; |
| log_set_context(LOG_CTX_GB_NSVC, fallback_nsvc); |
| fallback_nsvc->ip.bts_addr = *saddr; |
| fallback_nsvc->ll = ll; |
| |
| rc = gprs_ns_vc_create(nsi, msg, fallback_nsvc, &nsvc); |
| |
| if (rc < 0) |
| return rc; |
| |
| rc = 0; |
| } |
| |
| if (nsvc) |
| rc = gprs_ns_process_msg(nsi, msg, &nsvc); |
| |
| return rc; |
| } |
| |
| char *gprs_ns_ll_str_buf(char *buf, size_t buf_len, const struct gprs_nsvc *nsvc) |
| { |
| switch(nsvc->ll) { |
| case GPRS_NS_LL_UDP: |
| snprintf(buf, buf_len, "%s:%u", |
| inet_ntoa(nsvc->ip.bts_addr.sin_addr), osmo_ntohs(nsvc->ip.bts_addr.sin_port)); |
| break; |
| case GPRS_NS_LL_FR_GRE: |
| snprintf(buf, buf_len, "%s:%u", |
| inet_ntoa(nsvc->frgre.bts_addr.sin_addr), osmo_ntohs(nsvc->frgre.bts_addr.sin_port)); |
| break; |
| default: |
| buf[0] = '\0'; |
| break; |
| } |
| |
| buf[buf_len - 1] = '\0'; |
| |
| return buf; |
| } |
| |
| const char *gprs_ns_ll_str(const struct gprs_nsvc *nsvc) |
| { |
| static __thread char buf[80]; |
| return gprs_ns_ll_str_buf(buf, sizeof(buf), nsvc); |
| } |
| |
| char *gprs_ns_ll_str_c(const void *ctx, const struct gprs_nsvc *nsvc) |
| { |
| char *buf = talloc_size(ctx, INET6_ADDRSTRLEN+10); |
| if (!buf) |
| return buf; |
| return gprs_ns_ll_str_buf(buf, INET6_ADDRSTRLEN+10, nsvc); |
| } |
| |
| void gprs_ns_ll_copy(struct gprs_nsvc *nsvc, struct gprs_nsvc *other) |
| { |
| nsvc->ll = other->ll; |
| |
| switch (nsvc->ll) { |
| case GPRS_NS_LL_UDP: |
| nsvc->ip = other->ip; |
| break; |
| case GPRS_NS_LL_FR_GRE: |
| nsvc->frgre = other->frgre; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| void gprs_ns_ll_clear(struct gprs_nsvc *nsvc) |
| { |
| switch (nsvc->ll) { |
| case GPRS_NS_LL_UDP: |
| nsvc->ip.bts_addr.sin_addr.s_addr = INADDR_ANY; |
| nsvc->ip.bts_addr.sin_port = 0; |
| break; |
| case GPRS_NS_LL_FR_GRE: |
| nsvc->frgre.bts_addr.sin_addr.s_addr = INADDR_ANY; |
| nsvc->frgre.bts_addr.sin_port = 0; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /*! Create/get NS-VC independently from underlying transport layer |
| * \param nsi NS instance to which the data belongs |
| * \param[in] msg message buffer containing newly-received data |
| * \param[in] fallback_nsvc is used to send error messages back to the peer |
| * and to initialise the ll info of a created NS-VC object |
| * \param[out] new_nsvc contains a pointer to a NS-VC object if one has |
| * been created or found |
| * \returns < 0 in case of error, GPRS_NS_CS_SKIPPED if a message has been |
| * skipped, GPRS_NS_CS_REJECTED if a message has been rejected and |
| * answered accordingly, GPRS_NS_CS_CREATED if a new NS-VC object |
| * has been created and registered, and GPRS_NS_CS_FOUND if an |
| * existing NS-VC object has been found with the same NSEI. |
| * |
| * This contains the initial NS automaton state (NS-VC not yet attached). |
| */ |
| int gprs_ns_vc_create(struct gprs_ns_inst *nsi, struct msgb *msg, |
| struct gprs_nsvc *fallback_nsvc, |
| struct gprs_nsvc **new_nsvc) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h; |
| struct gprs_nsvc *existing_nsvc; |
| |
| struct tlv_parsed tp; |
| uint16_t nsvci; |
| uint16_t nsei; |
| |
| int rc; |
| |
| if (nsh->pdu_type == NS_PDUT_STATUS) { |
| /* Do not respond, see 3GPP TS 08.16, 7.5.1 */ |
| LOGP(DNS, LOGL_INFO, "Ignoring NS STATUS from %s " |
| "for non-existing NS-VC\n", |
| gprs_ns_ll_str(fallback_nsvc)); |
| return GPRS_NS_CS_SKIPPED; |
| } |
| |
| if (nsh->pdu_type == NS_PDUT_ALIVE_ACK) { |
| /* Ignore this, see 3GPP TS 08.16, 7.4.1 */ |
| LOGP(DNS, LOGL_INFO, "Ignoring NS ALIVE ACK from %s " |
| "for non-existing NS-VC\n", |
| gprs_ns_ll_str(fallback_nsvc)); |
| return GPRS_NS_CS_SKIPPED; |
| } |
| |
| if (nsh->pdu_type == NS_PDUT_RESET_ACK) { |
| /* Ignore this, see 3GPP TS 08.16, 7.3.1 */ |
| LOGP(DNS, LOGL_INFO, "Ignoring NS RESET ACK from %s " |
| "for non-existing NS-VC\n", |
| gprs_ns_ll_str(fallback_nsvc)); |
| return GPRS_NS_CS_SKIPPED; |
| } |
| |
| /* Only the RESET procedure creates a new NSVC */ |
| if (nsh->pdu_type != NS_PDUT_RESET) { |
| /* Since we have no NSVC, we have to use a fake */ |
| log_set_context(LOG_CTX_GB_NSVC, fallback_nsvc); |
| LOGP(DNS, LOGL_INFO, "Rejecting NS PDU type %s " |
| "from %s for non-existing NS-VC\n", |
| get_value_string(gprs_ns_pdu_strings, nsh->pdu_type), gprs_ns_ll_str(fallback_nsvc)); |
| fallback_nsvc->nsvci = fallback_nsvc->nsei = 0xfffe; |
| fallback_nsvc->nsvci_is_valid = 0; |
| ns_set_state(fallback_nsvc, NSE_S_ALIVE); |
| |
| rc = gprs_ns_tx_status(fallback_nsvc, |
| NS_CAUSE_PDU_INCOMP_PSTATE, 0, msg); |
| if (rc < 0) { |
| LOGP(DNS, LOGL_ERROR, "TX failed (%d) to peer %s\n", |
| rc, gprs_ns_ll_str(fallback_nsvc)); |
| return rc; |
| } |
| return GPRS_NS_CS_REJECTED; |
| } |
| |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| if (rc < 0) { |
| LOGP(DNS, LOGL_ERROR, "Rx NS RESET Error %d during " |
| "TLV Parse\n", rc); |
| return rc; |
| } |
| if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || |
| !TLVP_PRESENT(&tp, NS_IE_VCI) || !TLVP_PRESENT(&tp, NS_IE_NSEI)) { |
| LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
| rc = gprs_ns_tx_status(fallback_nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, |
| msg); |
| CHECK_TX_RC(rc, fallback_nsvc); |
| return -EINVAL; |
| } |
| nsvci = tlvp_val16be(&tp, NS_IE_VCI); |
| nsei = tlvp_val16be(&tp, NS_IE_NSEI); |
| /* Check if we already know this NSVCI, the remote end might |
| * simply have changed addresses, or it is a SGSN */ |
| existing_nsvc = gprs_nsvc_by_nsvci(nsi, nsvci); |
| if (!existing_nsvc) { |
| *new_nsvc = gprs_nsvc_create2(nsi, 0xffff, 1, 1); |
| (*new_nsvc)->nsvci_is_valid = 0; |
| log_set_context(LOG_CTX_GB_NSVC, *new_nsvc); |
| gprs_ns_ll_copy(*new_nsvc, fallback_nsvc); |
| LOGP(DNS, LOGL_INFO, "Creating NS-VC for BSS at %s\n", |
| gprs_ns_ll_str(fallback_nsvc)); |
| |
| return GPRS_NS_CS_CREATED; |
| } |
| |
| /* Check NSEI */ |
| if (existing_nsvc->nsei != nsei) { |
| LOGP(DNS, LOGL_NOTICE, |
| "NS-VC changed NSEI (NSVCI=%u) from %u to %u\n", |
| nsvci, existing_nsvc->nsei, nsei); |
| |
| /* Override old NSEI */ |
| existing_nsvc->nsei = nsei; |
| |
| /* Do statistics */ |
| rate_ctr_inc(rate_ctr_group_get_ctr(existing_nsvc->ctrg, NS_CTR_NSEI_CHG)); |
| } |
| |
| *new_nsvc = existing_nsvc; |
| gprs_ns_ll_copy(*new_nsvc, fallback_nsvc); |
| return GPRS_NS_CS_FOUND; |
| } |
| |
| /*! Process NS message independently from underlying transport layer |
| * \param nsi NS instance to which the data belongs |
| * \param[in] msg message buffer containing newly-received data |
| * \param[inout] nsvc refers to the virtual connection, may be modified when |
| * processing a NS_RESET |
| * \returns 0 in case of success, < 0 in case of error |
| * |
| * This contains the main NS automaton. |
| */ |
| int gprs_ns_process_msg(struct gprs_ns_inst *nsi, struct msgb *msg, |
| struct gprs_nsvc **nsvc) |
| { |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| struct tlv_parsed tp; |
| int rc = 0; |
| |
| msgb_nsei(msg) = (*nsvc)->nsei; |
| |
| log_set_context(LOG_CTX_GB_NSVC, *nsvc); |
| |
| /* Increment number of Incoming bytes */ |
| rate_ctr_inc(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_PKTS_IN)); |
| rate_ctr_add(rate_ctr_group_get_ctr((*nsvc)->ctrg, NS_CTR_BYTES_IN), msgb_l2len(msg)); |
| |
| if (nsvc_is_not_used(*nsvc) && !ns_is_sns(nsh->pdu_type) && nsh->pdu_type != NS_PDUT_STATUS) { |
| LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx %s on unused/pre-configured endpoint, discarding\n", |
| (*nsvc)->nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| gprs_ns_tx_status(*nsvc, NS_CAUSE_PROTO_ERR_UNSPEC, 0, msg); |
| return 0; |
| } |
| |
| switch (nsh->pdu_type) { |
| case NS_PDUT_ALIVE: |
| /* If we're dead and blocked and suddenly receive a |
| * NS-ALIVE out of the blue, we might have been re-started |
| * and should send a NS-RESET to make sure everything recovers |
| * fine. */ |
| if ((*nsvc)->state == NSE_S_BLOCKED) |
| rc = gprs_nsvc_reset((*nsvc), NS_CAUSE_PDU_INCOMP_PSTATE); |
| else if (!((*nsvc)->state & NSE_S_RESET)) { |
| /* if we're not alive, we cannot transmit the ACK; set ALIVE */ |
| if (!((*nsvc)->state & NSE_S_ALIVE)) |
| ns_mark_alive(*nsvc); |
| rc = gprs_ns_tx_alive_ack(*nsvc); |
| } |
| break; |
| case NS_PDUT_ALIVE_ACK: |
| ns_mark_alive(*nsvc); |
| if ((*nsvc)->timer_mode == NSVC_TIMER_TNS_ALIVE) |
| osmo_stat_item_set(osmo_stat_item_group_get_item((*nsvc)->statg, NS_STAT_ALIVE_DELAY), |
| nsvc_timer_elapsed_ms(*nsvc)); |
| /* stop Tns-alive and start Tns-test */ |
| nsvc_start_timer(*nsvc, NSVC_TIMER_TNS_TEST); |
| if ((*nsvc)->remote_end_is_sgsn) { |
| /* FIXME: this should be one level higher */ |
| if ((*nsvc)->state & NSE_S_BLOCKED) |
| rc = gprs_ns_tx_unblock(*nsvc); |
| } |
| break; |
| case NS_PDUT_UNITDATA: |
| /* actual user data */ |
| rc = gprs_ns_rx_unitdata(*nsvc, msg); |
| break; |
| case NS_PDUT_STATUS: |
| rc = gprs_ns_rx_status(*nsvc, msg); |
| break; |
| case NS_PDUT_RESET: |
| rc = gprs_ns_rx_reset(nsvc, msg); |
| break; |
| case NS_PDUT_RESET_ACK: |
| rc = gprs_ns_rx_reset_ack(nsvc, msg); |
| break; |
| case NS_PDUT_UNBLOCK: |
| /* Section 7.2: unblocking procedure */ |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS UNBLOCK\n", (*nsvc)->nsei); |
| ns_mark_unblocked(*nsvc); |
| /* This UNBLOCK_ACK message will cause our peer to move us into NS_UNBLOCKED state. */ |
| rc = gprs_ns_tx_simple(*nsvc, NS_PDUT_UNBLOCK_ACK); |
| if (rc < 0) |
| break; |
| /* |
| * UNBLOCK_ACK has been transmitted. |
| * Signal handlers may send additional messages following UNBLOCK_ACK under |
| * the assumption that NS is now in UNBLOCKED state at our peer's end. |
| */ |
| ns_osmo_signal_dispatch(*nsvc, S_NS_UNBLOCK, 0); |
| break; |
| case NS_PDUT_UNBLOCK_ACK: |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS UNBLOCK ACK\n", (*nsvc)->nsei); |
| /* mark NS-VC as unblocked + active */ |
| ns_set_state(*nsvc, NSE_S_ALIVE); |
| ns_set_remote_state(*nsvc, NSE_S_ALIVE); |
| ns_osmo_signal_dispatch(*nsvc, S_NS_UNBLOCK, 0); |
| break; |
| case NS_PDUT_BLOCK: |
| rc = gprs_ns_rx_block(*nsvc, msg); |
| break; |
| case NS_PDUT_BLOCK_ACK: |
| LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS BLOCK ACK\n", (*nsvc)->nsei); |
| /* mark remote NS-VC as blocked + active */ |
| ns_set_remote_state(*nsvc, NSE_S_BLOCKED | NSE_S_ALIVE); |
| break; |
| case SNS_PDUT_CONFIG: |
| if (!nsi->bss_sns_fi) |
| goto unexpected_sns; |
| /* one additional byte ('end flag') before the TLV part starts */ |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data+1, |
| msgb_l2len(msg) - sizeof(*nsh)-1, 0, 0); |
| if (rc < 0) { |
| LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); |
| return rc; |
| } |
| /* All sub-network service related message types */ |
| rc = gprs_ns_rx_sns(nsi, msg, &tp); |
| break; |
| case SNS_PDUT_ACK: |
| case SNS_PDUT_ADD: |
| case SNS_PDUT_CHANGE_WEIGHT: |
| case SNS_PDUT_DELETE: |
| if (!nsi->bss_sns_fi) |
| goto unexpected_sns; |
| /* weird layout: NSEI TLV, then value-only transaction IE, then TLV again */ |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data+5, |
| msgb_l2len(msg) - sizeof(*nsh)-5, 0, 0); |
| if (rc < 0) { |
| LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); |
| return rc; |
| } |
| tp.lv[NS_IE_NSEI].val = nsh->data+2; |
| tp.lv[NS_IE_NSEI].len = 2; |
| tp.lv[NS_IE_TRANS_ID].val = nsh->data+4; |
| tp.lv[NS_IE_TRANS_ID].len = 1; |
| rc = gprs_ns_rx_sns(nsi, msg, &tp); |
| break; |
| case SNS_PDUT_CONFIG_ACK: |
| case SNS_PDUT_SIZE: |
| case SNS_PDUT_SIZE_ACK: |
| if (!nsi->bss_sns_fi) |
| goto unexpected_sns; |
| rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| if (rc < 0) { |
| LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); |
| return rc; |
| } |
| /* All sub-network service related message types */ |
| rc = gprs_ns_rx_sns(nsi, msg, &tp); |
| break; |
| default: |
| LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx Unknown NS PDU type 0x%02x\n", |
| (*nsvc)->nsei, nsh->pdu_type); |
| rc = -EINVAL; |
| break; |
| unexpected_sns: |
| LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx %s for NS Instance that has no SNS!\n", |
| (*nsvc)->nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| rc = -EINVAL; |
| break; |
| } |
| return rc; |
| } |
| |
| static bool gprs_sns_fsm_registered = false; |
| |
| /*! Create a new GPRS NS instance |
| * \param[in] cb Call-back function for incoming BSSGP data |
| * \returns dynamically allocated gprs_ns_inst |
| */ |
| struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb, void *ctx) |
| { |
| struct gprs_ns_inst *nsi; |
| |
| if (!gprs_sns_fsm_registered) { |
| int rc = gprs_sns_init(); |
| if (rc < 0) |
| return NULL; |
| gprs_sns_fsm_registered = true; |
| } |
| |
| nsi = talloc_zero(ctx, struct gprs_ns_inst); |
| if (!nsi) |
| return NULL; |
| nsi->cb = cb; |
| INIT_LLIST_HEAD(&nsi->gprs_nsvcs); |
| nsi->timeout[NS_TOUT_TNS_BLOCK] = 3; |
| nsi->timeout[NS_TOUT_TNS_BLOCK_RETRIES] = 3; |
| nsi->timeout[NS_TOUT_TNS_RESET] = 3; |
| nsi->timeout[NS_TOUT_TNS_RESET_RETRIES] = 3; |
| nsi->timeout[NS_TOUT_TNS_TEST] = 30; |
| nsi->timeout[NS_TOUT_TNS_ALIVE] = 3; |
| nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES] = 10; |
| nsi->timeout[NS_TOUT_TSNS_PROV] = 3; /* 1..10 */ |
| |
| /* Create the dummy NSVC that we use for sending |
| * messages to non-existant/unknown NS-VC's */ |
| nsi->unknown_nsvc = gprs_nsvc_create2(nsi, 0xfffe, 1, 1); |
| nsi->unknown_nsvc->nsvci_is_valid = 0; |
| llist_del(&nsi->unknown_nsvc->list); |
| INIT_LLIST_HEAD(&nsi->unknown_nsvc->list); |
| |
| /* By default we are in IPA compatible mode, that is we use NS-RESET, NS-BLOCK |
| * and NS-UNBLOCK procedures even for an IP/UDP based Gb interface, in violation |
| * of 3GPP TS 48.016. */ |
| nsi->nsip.use_reset_block_unblock = true; |
| |
| return nsi; |
| } |
| |
| void gprs_ns_close(struct gprs_ns_inst *nsi) |
| { |
| struct gprs_nsvc *nsvc, *nsvc2; |
| |
| gprs_nsvc_delete(nsi->unknown_nsvc); |
| |
| /* delete all NSVCs and clear their timers */ |
| llist_for_each_entry_safe(nsvc, nsvc2, &nsi->gprs_nsvcs, list) |
| gprs_nsvc_delete(nsvc); |
| |
| /* close socket and unregister */ |
| if (nsi->nsip.fd.data) { |
| close(nsi->nsip.fd.fd); |
| osmo_fd_unregister(&nsi->nsip.fd); |
| nsi->nsip.fd.data = NULL; |
| } |
| } |
| |
| /*! Destroy an entire NS instance |
| * \param nsi gprs_ns_inst that is to be destroyed |
| * |
| * This function releases all resources associated with the |
| * NS-instance. |
| */ |
| void gprs_ns_destroy(struct gprs_ns_inst *nsi) |
| { |
| gprs_ns_close(nsi); |
| /* free the NSI */ |
| talloc_free(nsi); |
| } |
| |
| |
| /* NS-over-IP code, according to 3GPP TS 48.016 Chapter 6.2 |
| * We don't support Size Procedure, Configuration Procedure, ChangeWeight Procedure */ |
| |
| /* Read a single NS-over-IP message */ |
| static struct msgb *read_nsip_msg(struct osmo_fd *bfd, int *error, |
| struct sockaddr_in *saddr) |
| { |
| struct msgb *msg = gprs_ns_msgb_alloc(); |
| int ret = 0; |
| socklen_t saddr_len = sizeof(*saddr); |
| |
| if (!msg) { |
| *error = -ENOMEM; |
| return NULL; |
| } |
| |
| ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE - NS_ALLOC_HEADROOM, 0, |
| (struct sockaddr *)saddr, &saddr_len); |
| if (ret < 0) { |
| LOGP(DNS, LOGL_ERROR, "recv error %s during NSIP recvfrom %s\n", |
| strerror(errno), osmo_sock_get_name2(bfd->fd)); |
| msgb_free(msg); |
| *error = ret; |
| return NULL; |
| } else if (ret == 0) { |
| msgb_free(msg); |
| *error = ret; |
| return NULL; |
| } |
| |
| msg->l2h = msg->data; |
| msgb_put(msg, ret); |
| |
| return msg; |
| } |
| |
| static int handle_nsip_read(struct osmo_fd *bfd) |
| { |
| int error; |
| struct sockaddr_in saddr; |
| struct gprs_ns_inst *nsi = bfd->data; |
| struct msgb *msg = read_nsip_msg(bfd, &error, &saddr); |
| |
| if (!msg) |
| return error; |
| |
| error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_UDP); |
| |
| msgb_free(msg); |
| |
| return error; |
| } |
| |
| static int handle_nsip_write(struct osmo_fd *bfd) |
| { |
| /* FIXME: actually send the data here instead of nsip_sendmsg() */ |
| return -EIO; |
| } |
| |
| static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg) |
| { |
| int rc; |
| struct gprs_ns_inst *nsi = nsvc->nsi; |
| struct sockaddr_in *daddr = &nsvc->ip.bts_addr; |
| |
| rc = sendto(nsi->nsip.fd.fd, msg->data, msg->len, 0, |
| (struct sockaddr *)daddr, sizeof(*daddr)); |
| |
| msgb_free(msg); |
| |
| return rc; |
| } |
| |
| /* UDP Port 23000 carries the LLC-in-BSSGP-in-NS protocol stack */ |
| static int nsip_fd_cb(struct osmo_fd *bfd, unsigned int what) |
| { |
| int rc = 0; |
| |
| if (what & OSMO_FD_READ) |
| rc = handle_nsip_read(bfd); |
| if (what & OSMO_FD_WRITE) |
| rc = handle_nsip_write(bfd); |
| |
| return rc; |
| } |
| |
| /*! Create a listening socket for GPRS NS/UDP/IP |
| * \param[in] nsi NS protocol instance to listen |
| * \returns >=0 (fd) in case of success, negative in case of error |
| * |
| * A call to this function will create a UDP socket bound to the port |
| * number and IP address specified in the NS protocol instance. The |
| * file descriptor of the socket will be stored in nsi->nsip.fd. |
| */ |
| int gprs_ns_nsip_listen(struct gprs_ns_inst *nsi) |
| { |
| struct in_addr in; |
| struct in_addr remote; |
| char remote_str[INET_ADDRSTRLEN]; |
| int ret; |
| |
| in.s_addr = osmo_htonl(nsi->nsip.local_ip); |
| remote.s_addr = osmo_htonl(nsi->nsip.remote_ip); |
| |
| nsi->nsip.fd.cb = nsip_fd_cb; |
| nsi->nsip.fd.data = nsi; |
| |
| if (nsi->nsip.remote_ip && nsi->nsip.remote_port) { |
| /* connect to ensure only we only accept packets from the |
| * configured remote end/peer */ |
| snprintf(remote_str, sizeof(remote_str), "%s", inet_ntoa(remote)); |
| ret = |
| osmo_sock_init2_ofd(&nsi->nsip.fd, AF_INET, SOCK_DGRAM, |
| IPPROTO_UDP, inet_ntoa(in), |
| nsi->nsip.local_port, remote_str, |
| nsi->nsip.remote_port, OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT | |
| OSMO_SOCK_F_BIND | OSMO_SOCK_F_DSCP(nsi->nsip.dscp)); |
| |
| LOGP(DNS, LOGL_NOTICE, |
| "Listening for nsip packets from %s:%u on %s:%u\n", |
| remote_str, nsi->nsip.remote_port, inet_ntoa(in), nsi->nsip.local_port); |
| } else { |
| /* Accept UDP packets from any source IP/Port */ |
| ret = osmo_sock_init_ofd(&nsi->nsip.fd, AF_INET, SOCK_DGRAM, |
| IPPROTO_UDP, inet_ntoa(in), nsi->nsip.local_port, |
| OSMO_SOCK_F_BIND | OSMO_SOCK_F_DSCP(nsi->nsip.dscp)); |
| |
| LOGP(DNS, LOGL_NOTICE, "Listening for nsip packets on %s:%u\n", inet_ntoa(in), nsi->nsip.local_port); |
| } |
| |
| if (ret < 0) { |
| nsi->nsip.fd.cb = NULL; |
| nsi->nsip.fd.data = NULL; |
| return ret; |
| } |
| |
| LOGP(DNS, LOGL_NOTICE, "NS UDP socket at %s:%d\n", inet_ntoa(in), nsi->nsip.local_port); |
| |
| return ret; |
| } |
| |
| /*! Initiate a RESET procedure |
| * \param[in] nsvc NS-VC in which to start the procedure |
| * \param[in] cause Numeric NS cause value |
| * |
| * This is a high-level function initiating a NS-RESET procedure. It |
| * will not only send a NS-RESET, but also set the state to BLOCKED and |
| * start the Tns-reset timer. |
| */ |
| int gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause) |
| { |
| int rc; |
| |
| ERR_IF_NSVC_USES_SNS(nsvc, "RESET procedure based on API request"); |
| |
| LOGP(DNS, LOGL_INFO, "NSEI=%u RESET procedure based on API request\n", |
| nsvc->nsei); |
| |
| /* Mark NS-VC locally as blocked and dead */ |
| ns_set_state(nsvc, NSE_S_BLOCKED | NSE_S_RESET); |
| |
| /* Send NS-RESET PDU */ |
| rc = gprs_ns_tx_reset(nsvc, cause); |
| if (rc < 0) { |
| LOGP(DNS, LOGL_ERROR, "NSEI=%u, error resetting NS-VC\n", |
| nsvc->nsei); |
| } |
| /* Start Tns-reset */ |
| nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET); |
| |
| return rc; |
| } |
| |
| /*! Establish a NS connection (from the BSS) to the SGSN |
| * \param nsi NS-instance |
| * \param[in] dest Destination IP/Port |
| * \param[in] nsei NSEI of the to-be-established NS-VC |
| * \param[in] nsvci NSVCI of the to-be-established NS-VC |
| * \returns struct gprs_nsvc representing the new NS-VC |
| * |
| * This function will establish a single NS/UDP/IP connection in uplink |
| * (BSS to SGSN) direction. |
| */ |
| struct gprs_nsvc *gprs_ns_nsip_connect(struct gprs_ns_inst *nsi, |
| struct sockaddr_in *dest, uint16_t nsei, |
| uint16_t nsvci) |
| { |
| struct gprs_nsvc *nsvc; |
| |
| nsvc = gprs_nsvc_by_rem_addr(nsi, dest); |
| if (!nsvc) |
| nsvc = gprs_nsvc_create2(nsi, nsvci, 1, 1); |
| nsvc->ip.bts_addr = *dest; |
| nsvc->nsei = nsei; |
| nsvc->remote_end_is_sgsn = 1; |
| |
| gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| return nsvc; |
| } |
| |
| /*! Establish a NS connection (from the BSS) to the SGSN using SNS auto-configuration |
| * \param nsi NS-instance |
| * \param[in] dest Destination IP/Port |
| * \param[in] nsei NSEI of the to-be-established NS-VC |
| * \param[in] nsvci NSVCI of the to-be-established NS-VC |
| * \returns struct gprs_nsvc representing the new NS-VC |
| * |
| * This function will establish a single NS/UDP/IP connection in uplink |
| * (BSS to SGSN) direction. It will start with the SNS-SIZE procedure, |
| * followed by BSS-originated SNS-CONFIG, then SGSN-originated SNS-CONFIG. |
| * |
| * Once configuration completes, the user will be notified by the S_SNS_CONFIGURED signal, |
| * at which point he typically would want to initiate NS-RESET by means of gprs_nsvc_reset(). |
| */ |
| struct gprs_nsvc *gprs_ns_nsip_connect_sns(struct gprs_ns_inst *nsi, |
| struct sockaddr_in *dest, uint16_t nsei, |
| uint16_t nsvci) |
| { |
| struct gprs_nsvc *nsvc; |
| |
| /* FIXME: We are getting the order wrong here. Normally, one would want |
| * to start the SNS FSM *before* creating any NS-VC and then create the NS-VC |
| * after the SNS layer has established the IP/port/etc. However, this would |
| * require some massive code and API changes compared to existing libosmogb, |
| * so let's keep the old logic. */ |
| nsvc = gprs_nsvc_by_rem_addr(nsi, dest); |
| if (!nsvc) { |
| /* create NSVC with 0 data + signalling weight. This is illegal in SNS |
| * and can hence only be created locally and serves as indication that |
| * this NS-VC shall not be used for anything except SNS _unless_ it is |
| * modified via SNS-{CONFIG,CHANGEWEIGHT,ADD} to become part of the |
| * active NS-VCs */ |
| nsvc = gprs_nsvc_create2(nsi, nsvci, 0, 0); |
| } |
| nsvc->ip.bts_addr = *dest; |
| nsvc->nsei = nsei; |
| nsvc->remote_end_is_sgsn = 1; |
| /* NSVCs are always UNBLOCKED in IP-SNS */ |
| ns_set_state(nsvc, 0); |
| |
| if (nsi->bss_sns_fi) |
| osmo_fsm_inst_term(nsi->bss_sns_fi, OSMO_FSM_TERM_REQUEST, NULL); |
| nsi->bss_sns_fi = gprs_sns_bss_fsm_alloc(nsi, nsvc, "NSIP"); |
| gprs_sns_bss_fsm_start(nsi); |
| return nsvc; |
| } |
| |
| void gprs_ns_set_log_ss(int ss) |
| { |
| DNS = ss; |
| } |
| |
| /*! Append the nsvc state to a talloc string |
| * \param s The string to append to (allocated with talloc) |
| * \param[in] nsvc The NS-VC to print the state of |
| * \returns The new string with state information appended to it |
| * |
| * This function will append a comma-separated state of the NS-VC to the |
| * string. The string needs to be allocated with talloc (e.g. talloc_strdup) |
| */ |
| char *gprs_nsvc_state_append(char *s, struct gprs_nsvc *nsvc) |
| { |
| s = talloc_asprintf_append(s, |
| "%u,%u,%s,%s,%s,%s,%s\n", |
| nsvc->nsei, nsvc->nsvci, |
| NS_DESC_A(nsvc->state), |
| NS_DESC_B(nsvc->state), |
| nsvc->remote_end_is_sgsn ? "SGSN" : "BSS", |
| NS_DESC_A(nsvc->remote_state), |
| NS_DESC_B(nsvc->remote_state)); |
| |
| return s; |
| } |
| |
| /*! Start the ALIVE timer procedure in all NS-VCs part of this NS Instance */ |
| void gprs_nsvc_start_test(struct gprs_nsvc *nsvc) |
| { |
| /* skip the initial NS-VC unless it has explicitly been configured |
| * via SNS-CONFIG from the SGSN */ |
| if (nsvc_is_not_used(nsvc)) |
| return; |
| gprs_ns_tx_alive(nsvc); |
| nsvc_start_timer(nsvc, NSVC_TIMER_TNS_TEST); |
| } |
| |
| void gprs_start_alive_all_nsvcs(struct gprs_ns_inst *nsi) |
| { |
| struct gprs_nsvc *nsvc; |
| llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| /* start the test procedure */ |
| gprs_nsvc_start_test(nsvc); |
| } |
| } |
| |
| /*! @} */ |