cellular-infrastructure
/
osmo-bsc
mirror of https://gerrit.osmocom.org/osmo-bsc
9
0
Fork 0
Code Issues Releases Wiki Activity
osmo-bsc/src/osmo-bsc_nat/bsc_nat_utils.c

536 lines
14 KiB
C
Raw Blame History

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