diff options
Diffstat (limited to 'src/osmo-bsc_nat/bsc_sccp.c')
-rw-r--r-- | src/osmo-bsc_nat/bsc_sccp.c | 247 |
1 files changed, 0 insertions, 247 deletions
diff --git a/src/osmo-bsc_nat/bsc_sccp.c b/src/osmo-bsc_nat/bsc_sccp.c deleted file mode 100644 index c6c265f7a..000000000 --- a/src/osmo-bsc_nat/bsc_sccp.c +++ /dev/null @@ -1,247 +0,0 @@ -/* SCCP patching and handling routines */ -/* - * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> - * (C) 2010 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/debug.h> -#include <openbsc/bsc_nat.h> -#include <openbsc/bsc_nat_sccp.h> - -#include <osmocom/sccp/sccp.h> - -#include <osmocom/core/talloc.h> - -#include <string.h> -#include <time.h> - -static int equal(struct sccp_source_reference *ref1, struct sccp_source_reference *ref2) -{ - return memcmp(ref1, ref2, sizeof(*ref1)) == 0; -} - -/* - * SCCP patching below - */ - -/* check if we are using this ref for patched already */ -static int sccp_ref_is_free(struct sccp_source_reference *ref, struct bsc_nat *nat) -{ - struct nat_sccp_connection *conn; - - llist_for_each_entry(conn, &nat->sccp_connections, list_entry) { - if (equal(ref, &conn->patched_ref)) - return -1; - } - - return 0; -} - -/* copied from sccp.c */ -static int assign_src_local_reference(struct sccp_source_reference *ref, struct bsc_nat *nat) -{ - static uint32_t last_ref = 0x50000; - int wrapped = 0; - - do { - struct sccp_source_reference reference; - reference.octet1 = (last_ref >> 0) & 0xff; - reference.octet2 = (last_ref >> 8) & 0xff; - reference.octet3 = (last_ref >> 16) & 0xff; - - ++last_ref; - /* do not use the reversed word and wrap around */ - if ((last_ref & 0x00FFFFFF) == 0x00FFFFFF) { - LOGP(DNAT, LOGL_NOTICE, "Wrapped searching for a free code\n"); - last_ref = 0; - ++wrapped; - } - - if (sccp_ref_is_free(&reference, nat) == 0) { - *ref = reference; - return 0; - } - } while (wrapped != 2); - - LOGP(DNAT, LOGL_ERROR, "Finding a free reference failed\n"); - return -1; -} - -struct nat_sccp_connection *create_sccp_src_ref(struct bsc_connection *bsc, - struct bsc_nat_parsed *parsed) -{ - struct nat_sccp_connection *conn; - - /* Some commercial BSCs like to reassign there SRC ref */ - llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) { - if (conn->bsc != bsc) - continue; - if (!equal(parsed->src_local_ref, &conn->real_ref)) - continue; - - /* the BSC has reassigned the SRC ref and we failed to keep track */ - memset(&conn->remote_ref, 0, sizeof(conn->remote_ref)); - if (assign_src_local_reference(&conn->patched_ref, bsc->nat) != 0) { - LOGP(DNAT, LOGL_ERROR, "BSC %d reused src ref: %d and we failed to generate a new id.\n", - bsc->cfg->nr, sccp_src_ref_to_int(parsed->src_local_ref)); - bsc_mgcp_dlcx(conn); - llist_del(&conn->list_entry); - talloc_free(conn); - return NULL; - } else { - clock_gettime(CLOCK_MONOTONIC, &conn->creation_time); - bsc_mgcp_dlcx(conn); - return conn; - } - } - - - conn = talloc_zero(bsc->nat, struct nat_sccp_connection); - if (!conn) { - LOGP(DNAT, LOGL_ERROR, "Memory allocation failure.\n"); - return NULL; - } - - conn->bsc = bsc; - clock_gettime(CLOCK_MONOTONIC, &conn->creation_time); - conn->real_ref = *parsed->src_local_ref; - if (assign_src_local_reference(&conn->patched_ref, bsc->nat) != 0) { - LOGP(DNAT, LOGL_ERROR, "Failed to assign a ref.\n"); - talloc_free(conn); - return NULL; - } - - bsc_mgcp_init(conn); - llist_add_tail(&conn->list_entry, &bsc->nat->sccp_connections); - rate_ctr_inc(&bsc->cfg->stats.ctrg->ctr[BCFG_CTR_SCCP_CONN]); - osmo_counter_inc(bsc->cfg->nat->stats.sccp.conn); - - LOGP(DNAT, LOGL_DEBUG, "Created 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), bsc); - - return conn; -} - -int update_sccp_src_ref(struct nat_sccp_connection *sccp, struct bsc_nat_parsed *parsed) -{ - if (!parsed->dest_local_ref || !parsed->src_local_ref) { - LOGP(DNAT, LOGL_ERROR, "CC MSG should contain both local and dest address.\n"); - return -1; - } - - sccp->remote_ref = *parsed->src_local_ref; - sccp->has_remote_ref = 1; - LOGP(DNAT, LOGL_DEBUG, "Updating 0x%x to remote 0x%x on %p\n", - sccp_src_ref_to_int(&sccp->patched_ref), - sccp_src_ref_to_int(&sccp->remote_ref), sccp->bsc); - - return 0; -} - -void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed) -{ - struct nat_sccp_connection *conn; - - llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) { - if (equal(parsed->src_local_ref, &conn->patched_ref)) { - sccp_connection_destroy(conn); - return; - } - } - - LOGP(DNAT, LOGL_ERROR, "Can not remove connection: 0x%x\n", - sccp_src_ref_to_int(parsed->src_local_ref)); -} - -/* - * We have a message from the MSC to the BSC. The MSC is using - * an address that was assigned by the MUX, we need to update the - * dest reference to the real network. - */ -struct nat_sccp_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg, - struct bsc_nat_parsed *parsed, - struct bsc_nat *nat) -{ - struct nat_sccp_connection *conn; - - if (!parsed->dest_local_ref) { - LOGP(DNAT, LOGL_ERROR, "MSG should contain dest_local_ref.\n"); - return NULL; - } - - - llist_for_each_entry(conn, &nat->sccp_connections, list_entry) { - if (!equal(parsed->dest_local_ref, &conn->patched_ref)) - continue; - - /* Change the dest address to the real one */ - *parsed->dest_local_ref = conn->real_ref; - return conn; - } - - return NULL; -} - -/* - * These are message to the MSC. We will need to find the BSC - * Connection by either the SRC or the DST local reference. - * - * In case of a CR we need to work by the SRC local reference - * in all other cases we need to work by the destination local - * reference.. - */ -struct nat_sccp_connection *patch_sccp_src_ref_to_msc(struct msgb *msg, - struct bsc_nat_parsed *parsed, - struct bsc_connection *bsc) -{ - struct nat_sccp_connection *conn; - - llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) { - if (conn->bsc != bsc) - continue; - - if (parsed->src_local_ref) { - if (equal(parsed->src_local_ref, &conn->real_ref)) { - *parsed->src_local_ref = conn->patched_ref; - return conn; - } - } else if (parsed->dest_local_ref) { - if (equal(parsed->dest_local_ref, &conn->remote_ref)) - return conn; - } else { - LOGP(DNAT, LOGL_ERROR, "Header has neither loc/dst ref.\n"); - return NULL; - } - } - - return NULL; -} - -struct nat_sccp_connection *bsc_nat_find_con_by_bsc(struct bsc_nat *nat, - struct sccp_source_reference *ref) -{ - struct nat_sccp_connection *conn; - - llist_for_each_entry(conn, &nat->sccp_connections, list_entry) { - if (equal(ref, &conn->real_ref)) - return conn; - } - - return NULL; -} |