536 lines
14 KiB
C
536 lines
14 KiB
C
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/* BSC Multiplexer/NAT Utilities */
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/*
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* (C) 2010-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010-2011 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/bsc/bsc_nat.h>
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#include <osmocom/bsc/bsc_nat_sccp.h>
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#include <osmocom/bsc/bsc_msg_filter.h>
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#include <osmocom/bsc/bsc_msc.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/ipaccess.h>
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#include <osmocom/bsc/vty.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/gsm/gsm0808.h>
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#include <osmocom/gsm/ipa.h>
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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#include <osmocom/gsm/protocol/gsm_04_11.h>
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#include <osmocom/sccp/sccp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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static const struct rate_ctr_desc bsc_cfg_ctr_description[] = {
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[BCFG_CTR_SCCP_CONN] = { "sccp.conn", "SCCP Connections "},
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[BCFG_CTR_SCCP_CALLS] = { "sccp.calls", "SCCP Assignment Commands "},
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[BCFG_CTR_NET_RECONN] = { "net.reconnects", "Network reconnects "},
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[BCFG_CTR_DROPPED_SCCP] = { "dropped.sccp", "Dropped SCCP connections."},
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[BCFG_CTR_DROPPED_CALLS] = { "dropped.calls", "Dropped active calls. "},
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[BCFG_CTR_REJECTED_CR] = { "rejected.cr", "Rejected CR due filter "},
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[BCFG_CTR_REJECTED_MSG] = { "rejected.msg", "Rejected MSG due filter "},
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[BCFG_CTR_ILL_PACKET] = { "rejected.ill", "Rejected due parse error "},
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[BCFG_CTR_CON_TYPE_LU] = { "conn.lu", "Conn Location Update "},
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[BCFG_CTR_CON_CMSERV_RQ] = { "conn.rq", "Conn CM Service Req "},
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[BCFG_CTR_CON_PAG_RESP] = { "conn.pag", "Conn Paging Response "},
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[BCFG_CTR_CON_SSA] = { "conn.ssa", "Conn USSD "},
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[BCFG_CTR_CON_OTHER] = { "conn.other", "Conn Other "},
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};
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static const struct rate_ctr_group_desc bsc_cfg_ctrg_desc = {
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.group_name_prefix = "nat.bsc",
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.group_description = "NAT BSC Statistics",
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.num_ctr = ARRAY_SIZE(bsc_cfg_ctr_description),
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.ctr_desc = bsc_cfg_ctr_description,
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.class_id = OSMO_STATS_CLASS_PEER,
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};
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struct bsc_nat *bsc_nat_alloc(void)
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{
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struct bsc_nat *nat = talloc_zero(tall_bsc_ctx, struct bsc_nat);
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if (!nat)
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return NULL;
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nat->main_dest = talloc_zero(nat, struct bsc_msc_dest);
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if (!nat->main_dest) {
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talloc_free(nat);
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return NULL;
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}
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INIT_LLIST_HEAD(&nat->sccp_connections);
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INIT_LLIST_HEAD(&nat->bsc_connections);
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INIT_LLIST_HEAD(&nat->paging_groups);
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INIT_LLIST_HEAD(&nat->bsc_configs);
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INIT_LLIST_HEAD(&nat->access_lists);
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INIT_LLIST_HEAD(&nat->dests);
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INIT_LLIST_HEAD(&nat->num_rewr);
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INIT_LLIST_HEAD(&nat->num_rewr_post);
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INIT_LLIST_HEAD(&nat->smsc_rewr);
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INIT_LLIST_HEAD(&nat->tpdest_match);
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INIT_LLIST_HEAD(&nat->sms_clear_tp_srr);
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INIT_LLIST_HEAD(&nat->sms_num_rewr);
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nat->stats.sccp.conn = osmo_counter_alloc("nat.sccp.conn");
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nat->stats.sccp.calls = osmo_counter_alloc("nat.sccp.calls");
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nat->stats.bsc.reconn = osmo_counter_alloc("nat.bsc.conn");
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nat->stats.bsc.auth_fail = osmo_counter_alloc("nat.bsc.auth_fail");
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nat->stats.msc.reconn = osmo_counter_alloc("nat.msc.conn");
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nat->stats.ussd.reconn = osmo_counter_alloc("nat.ussd.conn");
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nat->auth_timeout = 2;
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nat->ping_timeout = 20;
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nat->pong_timeout = 5;
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llist_add(&nat->main_dest->list, &nat->dests);
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nat->main_dest->ip = talloc_strdup(nat, "127.0.0.1");
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nat->main_dest->port = 5000;
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return nat;
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}
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void bsc_nat_free(struct bsc_nat *nat)
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{
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struct bsc_config *cfg, *tmp;
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struct bsc_msg_acc_lst *lst, *tmp_lst;
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llist_for_each_entry_safe(cfg, tmp, &nat->bsc_configs, entry)
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bsc_config_free(cfg);
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llist_for_each_entry_safe(lst, tmp_lst, &nat->access_lists, list)
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bsc_msg_acc_lst_delete(lst);
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bsc_nat_num_rewr_entry_adapt(nat, &nat->num_rewr, NULL);
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bsc_nat_num_rewr_entry_adapt(nat, &nat->num_rewr_post, NULL);
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bsc_nat_num_rewr_entry_adapt(nat, &nat->sms_clear_tp_srr, NULL);
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bsc_nat_num_rewr_entry_adapt(nat, &nat->sms_num_rewr, NULL);
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bsc_nat_num_rewr_entry_adapt(nat, &nat->tpdest_match, NULL);
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osmo_counter_free(nat->stats.sccp.conn);
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osmo_counter_free(nat->stats.sccp.calls);
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osmo_counter_free(nat->stats.bsc.reconn);
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osmo_counter_free(nat->stats.bsc.auth_fail);
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osmo_counter_free(nat->stats.msc.reconn);
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osmo_counter_free(nat->stats.ussd.reconn);
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talloc_free(nat->mgcp_cfg);
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talloc_free(nat);
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}
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void bsc_nat_set_msc_ip(struct bsc_nat *nat, const char *ip)
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{
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osmo_talloc_replace_string(nat, &nat->main_dest->ip, ip);
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}
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struct bsc_connection *bsc_connection_alloc(struct bsc_nat *nat)
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{
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struct bsc_connection *con = talloc_zero(nat, struct bsc_connection);
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if (!con)
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return NULL;
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con->nat = nat;
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osmo_wqueue_init(&con->write_queue, 100);
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INIT_LLIST_HEAD(&con->cmd_pending);
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INIT_LLIST_HEAD(&con->pending_dlcx);
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return con;
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}
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struct bsc_config *bsc_config_alloc(struct bsc_nat *nat, const char *token,
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unsigned int number)
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{
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struct bsc_config *conf = talloc_zero(nat, struct bsc_config);
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if (!conf)
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return NULL;
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conf->token = talloc_strdup(conf, token);
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conf->nr = number;
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conf->nat = nat;
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conf->max_endpoints = 32;
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conf->paging_group = PAGIN_GROUP_UNASSIGNED;
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INIT_LLIST_HEAD(&conf->lac_list);
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llist_add_tail(&conf->entry, &nat->bsc_configs);
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++nat->num_bsc;
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conf->stats.ctrg = rate_ctr_group_alloc(conf, &bsc_cfg_ctrg_desc, conf->nr);
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if (!conf->stats.ctrg) {
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llist_del(&conf->entry);
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talloc_free(conf);
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return NULL;
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}
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return conf;
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}
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struct bsc_config *bsc_config_by_token(struct bsc_nat *nat, const char *token, int len)
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{
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struct bsc_config *conf;
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llist_for_each_entry(conf, &nat->bsc_configs, entry) {
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/*
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* Add the '\0' of the token for the memcmp, the IPA messages
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* for some reason added null termination.
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*/
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const int token_len = strlen(conf->token) + 1;
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if (token_len == len && memcmp(conf->token, token, token_len) == 0)
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return conf;
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}
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return NULL;
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}
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void bsc_config_free(struct bsc_config *cfg)
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{
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llist_del(&cfg->entry);
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rate_ctr_group_free(cfg->stats.ctrg);
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cfg->nat->num_bsc--;
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OSMO_ASSERT(cfg->nat->num_bsc >= 0);
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talloc_free(cfg);
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}
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static void _add_lac(void *ctx, struct llist_head *list, int _lac)
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{
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struct bsc_lac_entry *lac;
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llist_for_each_entry(lac, list, entry)
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if (lac->lac == _lac)
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return;
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lac = talloc_zero(ctx, struct bsc_lac_entry);
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if (!lac) {
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LOGP(DNAT, LOGL_ERROR, "Failed to allocate.\n");
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return;
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}
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lac->lac = _lac;
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llist_add_tail(&lac->entry, list);
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}
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static void _del_lac(struct llist_head *list, int _lac)
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{
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struct bsc_lac_entry *lac;
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llist_for_each_entry(lac, list, entry)
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if (lac->lac == _lac) {
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llist_del(&lac->entry);
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talloc_free(lac);
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return;
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}
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}
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void bsc_config_add_lac(struct bsc_config *cfg, int _lac)
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{
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_add_lac(cfg, &cfg->lac_list, _lac);
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}
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void bsc_config_del_lac(struct bsc_config *cfg, int _lac)
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{
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_del_lac(&cfg->lac_list, _lac);
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}
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struct bsc_nat_paging_group *bsc_nat_paging_group_create(struct bsc_nat *nat, int group)
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{
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struct bsc_nat_paging_group *pgroup;
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pgroup = talloc_zero(nat, struct bsc_nat_paging_group);
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if (!pgroup) {
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LOGP(DNAT, LOGL_ERROR, "Failed to allocate a paging group.\n");
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return NULL;
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}
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pgroup->nr = group;
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INIT_LLIST_HEAD(&pgroup->lists);
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llist_add_tail(&pgroup->entry, &nat->paging_groups);
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return pgroup;
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}
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void bsc_nat_paging_group_delete(struct bsc_nat_paging_group *pgroup)
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{
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llist_del(&pgroup->entry);
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talloc_free(pgroup);
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}
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struct bsc_nat_paging_group *bsc_nat_paging_group_num(struct bsc_nat *nat, int group)
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{
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struct bsc_nat_paging_group *pgroup;
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llist_for_each_entry(pgroup, &nat->paging_groups, entry)
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if (pgroup->nr == group)
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return pgroup;
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return NULL;
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}
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void bsc_nat_paging_group_add_lac(struct bsc_nat_paging_group *pgroup, int lac)
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{
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_add_lac(pgroup, &pgroup->lists, lac);
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}
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void bsc_nat_paging_group_del_lac(struct bsc_nat_paging_group *pgroup, int lac)
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{
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_del_lac(&pgroup->lists, lac);
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}
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int bsc_config_handles_lac(struct bsc_config *cfg, int lac_nr)
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{
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struct bsc_nat_paging_group *pgroup;
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struct bsc_lac_entry *entry;
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llist_for_each_entry(entry, &cfg->lac_list, entry)
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if (entry->lac == lac_nr)
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return 1;
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/* now lookup the paging group */
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pgroup = bsc_nat_paging_group_num(cfg->nat, cfg->paging_group);
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if (!pgroup)
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return 0;
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llist_for_each_entry(entry, &pgroup->lists, entry)
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if (entry->lac == lac_nr)
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return 1;
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return 0;
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}
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void sccp_connection_destroy(struct nat_sccp_connection *conn)
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{
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LOGP(DNAT, LOGL_DEBUG, "Destroy 0x%x <-> 0x%x mapping for con %p\n",
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sccp_src_ref_to_int(&conn->real_ref),
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sccp_src_ref_to_int(&conn->patched_ref), conn->bsc);
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bsc_mgcp_dlcx(conn);
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llist_del(&conn->list_entry);
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talloc_free(conn);
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}
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int bsc_nat_find_paging(struct msgb *msg,
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const uint8_t **out_data, int *out_leng)
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{
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int data_length;
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const uint8_t *data;
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struct tlv_parsed tp;
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if (!msg->l3h || msgb_l3len(msg) < 3) {
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LOGP(DNAT, LOGL_ERROR, "Paging message is too short.\n");
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return -1;
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}
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tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0);
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if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST)) {
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LOGP(DNAT, LOGL_ERROR, "No CellIdentifier List inside paging msg.\n");
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return -2;
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}
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data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST);
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data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST);
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/* No need to try a different BSS */
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if (data[0] == CELL_IDENT_BSS) {
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return -3;
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} else if (data[0] != CELL_IDENT_LAC) {
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LOGP(DNAT, LOGL_ERROR, "Unhandled cell ident discrminator: %d\n", data[0]);
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return -4;
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}
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*out_data = &data[1];
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*out_leng = data_length - 1;
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return 0;
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}
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int bsc_write_mgcp(struct bsc_connection *bsc, const uint8_t *data, unsigned int length)
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{
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struct msgb *msg;
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if (length > 4096 - 128) {
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LOGP(DLINP, LOGL_ERROR, "Can not send message of that size.\n");
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return -1;
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}
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msg = msgb_alloc_headroom(4096, 128, "to-bsc");
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if (!msg) {
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LOGP(DLINP, LOGL_ERROR, "Failed to allocate memory for BSC msg.\n");
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return -1;
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}
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/* copy the data */
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msg->l3h = msgb_put(msg, length);
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memcpy(msg->l3h, data, length);
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return bsc_write(bsc, msg, IPAC_PROTO_MGCP_OLD);
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}
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int bsc_write(struct bsc_connection *bsc, struct msgb *msg, int proto)
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{
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return bsc_do_write(&bsc->write_queue, msg, proto);
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}
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int bsc_do_write(struct osmo_wqueue *queue, struct msgb *msg, int proto)
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{
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/* prepend the header */
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ipa_prepend_header(msg, proto);
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return bsc_write_msg(queue, msg);
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}
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int bsc_write_msg(struct osmo_wqueue *queue, struct msgb *msg)
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{
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if (osmo_wqueue_enqueue(queue, msg) != 0) {
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LOGP(DLINP, LOGL_ERROR, "Failed to enqueue the write.\n");
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msgb_free(msg);
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return -1;
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}
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return 0;
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}
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struct gsm48_hdr *bsc_unpack_dtap(struct bsc_nat_parsed *parsed,
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struct msgb *msg, uint32_t *len)
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{
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/* gsm_type is actually the size of the dtap */
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*len = parsed->gsm_type;
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if (*len < msgb_l3len(msg) - 3) {
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LOGP(DNAT, LOGL_ERROR, "Not enough space for DTAP.\n");
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return NULL;
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}
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if (msgb_l3len(msg) - 3 < msg->l3h[2]) {
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LOGP(DNAT, LOGL_ERROR,
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"GSM48 payload does not fit: %d %d\n",
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msg->l3h[2], msgb_l3len(msg) - 3);
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return NULL;
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}
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msg->l4h = &msg->l3h[3];
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return (struct gsm48_hdr *) msg->l4h;
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}
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static const char *con_types [] = {
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[FLT_CON_TYPE_NONE] = "n/a",
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[FLT_CON_TYPE_LU] = "Location Update",
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[FLT_CON_TYPE_CM_SERV_REQ] = "CM Serv Req",
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[FLT_CON_TYPE_PAG_RESP] = "Paging Response",
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[FLT_CON_TYPE_SSA] = "Supplementar Service Activation",
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[FLT_CON_TYPE_LOCAL_REJECT] = "Local Reject",
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[FLT_CON_TYPE_OTHER] = "Other",
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};
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const char *bsc_con_type_to_string(int type)
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{
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return con_types[type];
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}
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int bsc_nat_msc_is_connected(struct bsc_nat *nat)
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{
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return nat->msc_con->is_connected;
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}
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static const int con_to_ctr[] = {
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[FLT_CON_TYPE_NONE] = -1,
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[FLT_CON_TYPE_LU] = BCFG_CTR_CON_TYPE_LU,
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[FLT_CON_TYPE_CM_SERV_REQ] = BCFG_CTR_CON_CMSERV_RQ,
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[FLT_CON_TYPE_PAG_RESP] = BCFG_CTR_CON_PAG_RESP,
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[FLT_CON_TYPE_SSA] = BCFG_CTR_CON_SSA,
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[FLT_CON_TYPE_LOCAL_REJECT] = -1,
|
|
[FLT_CON_TYPE_OTHER] = BCFG_CTR_CON_OTHER,
|
|
};
|
|
|
|
int bsc_conn_type_to_ctr(struct nat_sccp_connection *conn)
|
|
{
|
|
return con_to_ctr[conn->filter_state.con_type];
|
|
}
|
|
|
|
int bsc_write_cb(struct osmo_fd *bfd, struct msgb *msg)
|
|
{
|
|
int rc;
|
|
|
|
rc = write(bfd->fd, msg->data, msg->len);
|
|
if (rc != msg->len)
|
|
LOGP(DNAT, LOGL_ERROR, "Failed to write message to the BSC.\n");
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void extract_lac(const uint8_t *data, uint16_t *lac, uint16_t *ci)
|
|
{
|
|
memcpy(lac, &data[0], sizeof(*lac));
|
|
memcpy(ci, &data[2], sizeof(*ci));
|
|
|
|
*lac = ntohs(*lac);
|
|
*ci = ntohs(*ci);
|
|
}
|
|
|
|
int bsc_nat_extract_lac(struct bsc_connection *bsc,
|
|
struct nat_sccp_connection *con,
|
|
struct bsc_nat_parsed *parsed, struct msgb *msg)
|
|
{
|
|
int data_length;
|
|
const uint8_t *data;
|
|
struct tlv_parsed tp;
|
|
uint16_t lac, ci;
|
|
|
|
if (parsed->gsm_type != BSS_MAP_MSG_COMPLETE_LAYER_3) {
|
|
LOGP(DNAT, LOGL_ERROR, "Can only extract LAC from Complete Layer3\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!msg->l3h || msgb_l3len(msg) < 3) {
|
|
LOGP(DNAT, LOGL_ERROR, "Complete Layer3 mssage is too short.\n");
|
|
return -1;
|
|
}
|
|
|
|
tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0);
|
|
if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER)) {
|
|
LOGP(DNAT, LOGL_ERROR, "No CellIdentifier List inside paging msg.\n");
|
|
return -2;
|
|
}
|
|
|
|
data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER);
|
|
data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER);
|
|
|
|
/* Attemt to get the LAC/CI from it */
|
|
if (data[0] == CELL_IDENT_WHOLE_GLOBAL) {
|
|
if (data_length != 8) {
|
|
LOGP(DNAT, LOGL_ERROR,
|
|
"Ident too short: %d\n", data_length);
|
|
return -3;
|
|
}
|
|
extract_lac(&data[1 + 3], &lac, &ci);
|
|
} else if (data[0] == CELL_IDENT_LAC_AND_CI) {
|
|
if (data_length != 5) {
|
|
LOGP(DNAT, LOGL_ERROR,
|
|
"Ident too short: %d\n", data_length);
|
|
return -3;
|
|
}
|
|
extract_lac(&data[1], &lac, &ci);
|
|
} else {
|
|
LOGP(DNAT, LOGL_ERROR,
|
|
"Unhandled cell identifier: %d\n", data[0]);
|
|
return -1;
|
|
}
|
|
|
|
con->lac = lac;
|
|
con->ci = ci;
|
|
return 0;
|
|
}
|