545 lines
15 KiB
C
545 lines
15 KiB
C
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/* Gb-proxy TLLI state handling */
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/* (C) 2014 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 <openbsc/gb_proxy.h>
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#include <openbsc/gprs_utils.h>
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#include <openbsc/gprs_gb_parse.h>
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#include <openbsc/gsm_data_shared.h>
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#include <openbsc/debug.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/talloc.h>
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struct gbproxy_tlli_info *gbproxy_find_tlli(struct gbproxy_peer *peer,
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uint32_t tlli)
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{
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struct gbproxy_tlli_info *tlli_info;
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struct gbproxy_patch_state *state = &peer->patch_state;
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llist_for_each_entry(tlli_info, &state->enabled_tllis, list)
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if (tlli_info->tlli.current == tlli ||
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tlli_info->tlli.assigned == tlli)
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return tlli_info;
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return NULL;
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}
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struct gbproxy_tlli_info *gbproxy_find_tlli_by_ptmsi(
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struct gbproxy_peer *peer,
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uint32_t ptmsi)
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{
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struct gbproxy_tlli_info *tlli_info;
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struct gbproxy_patch_state *state = &peer->patch_state;
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llist_for_each_entry(tlli_info, &state->enabled_tllis, list)
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if (tlli_info->tlli.ptmsi == ptmsi)
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return tlli_info;
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return NULL;
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}
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struct gbproxy_tlli_info *gbproxy_find_tlli_by_sgsn_tlli(
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struct gbproxy_peer *peer,
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uint32_t tlli)
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{
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struct gbproxy_tlli_info *tlli_info;
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struct gbproxy_patch_state *state = &peer->patch_state;
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llist_for_each_entry(tlli_info, &state->enabled_tllis, list)
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if (tlli_info->sgsn_tlli.current == tlli ||
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tlli_info->sgsn_tlli.assigned == tlli)
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return tlli_info;
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return NULL;
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}
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struct gbproxy_tlli_info *gbproxy_find_tlli_by_mi(
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struct gbproxy_peer *peer,
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const uint8_t *mi_data,
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size_t mi_data_len)
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{
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struct gbproxy_tlli_info *tlli_info;
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struct gbproxy_patch_state *state = &peer->patch_state;
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if (!gprs_is_mi_imsi(mi_data, mi_data_len))
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return NULL;
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llist_for_each_entry(tlli_info, &state->enabled_tllis, list) {
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if (tlli_info->mi_data_len != mi_data_len)
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continue;
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if (memcmp(tlli_info->mi_data, mi_data, mi_data_len) != 0)
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continue;
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return tlli_info;
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}
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return NULL;
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}
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void gbproxy_delete_tlli(struct gbproxy_peer *peer,
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struct gbproxy_tlli_info *tlli_info)
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{
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struct gbproxy_patch_state *state = &peer->patch_state;
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llist_del(&tlli_info->list);
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talloc_free(tlli_info);
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state->enabled_tllis_count -= 1;
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peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current =
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state->enabled_tllis_count;
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}
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void gbproxy_delete_tllis(struct gbproxy_peer *peer)
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{
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struct gbproxy_tlli_info *tlli_info, *nxt;
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struct gbproxy_patch_state *state = &peer->patch_state;
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llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list)
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gbproxy_delete_tlli(peer, tlli_info);
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OSMO_ASSERT(state->enabled_tllis_count == 0);
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OSMO_ASSERT(llist_empty(&state->enabled_tllis));
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}
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static void gbproxy_attach_tlli_info(struct gbproxy_peer *peer, time_t now,
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struct gbproxy_tlli_info *tlli_info)
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{
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struct gbproxy_patch_state *state = &peer->patch_state;
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tlli_info->timestamp = now;
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llist_add(&tlli_info->list, &state->enabled_tllis);
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state->enabled_tllis_count += 1;
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peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current =
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state->enabled_tllis_count;
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}
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int gbproxy_remove_stale_tllis(struct gbproxy_peer *peer, time_t now)
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{
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struct gbproxy_patch_state *state = &peer->patch_state;
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int exceeded_max_len = 0;
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int deleted_count = 0;
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int check_for_age;
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if (peer->cfg->tlli_max_len > 0)
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exceeded_max_len =
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state->enabled_tllis_count - peer->cfg->tlli_max_len;
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check_for_age = peer->cfg->tlli_max_age > 0;
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for (; exceeded_max_len > 0; exceeded_max_len--) {
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struct gbproxy_tlli_info *tlli_info;
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OSMO_ASSERT(!llist_empty(&state->enabled_tllis));
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tlli_info = llist_entry(state->enabled_tllis.prev,
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struct gbproxy_tlli_info,
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list);
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LOGP(DGPRS, LOGL_INFO,
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"Removing TLLI %08x from list "
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"(stale, length %d, max_len exceeded)\n",
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tlli_info->tlli.current, state->enabled_tllis_count);
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gbproxy_delete_tlli(peer, tlli_info);
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deleted_count += 1;
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}
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while (check_for_age && !llist_empty(&state->enabled_tllis)) {
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time_t age;
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struct gbproxy_tlli_info *tlli_info;
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tlli_info = llist_entry(state->enabled_tllis.prev,
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struct gbproxy_tlli_info,
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list);
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age = now - tlli_info->timestamp;
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/* age < 0 only happens after system time jumps, discard entry */
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if (age <= peer->cfg->tlli_max_age && age >= 0) {
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check_for_age = 0;
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continue;
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}
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LOGP(DGPRS, LOGL_INFO,
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"Removing TLLI %08x from list "
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"(stale, age %d, max_age exceeded)\n",
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tlli_info->tlli.current, (int)age);
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gbproxy_delete_tlli(peer, tlli_info);
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deleted_count += 1;
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}
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return deleted_count;
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}
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static struct gbproxy_tlli_info *gbproxy_tlli_info_alloc(
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struct gbproxy_peer *peer)
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{
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struct gbproxy_tlli_info *tlli_info;
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tlli_info = talloc_zero(peer, struct gbproxy_tlli_info);
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tlli_info->tlli.ptmsi = GSM_RESERVED_TMSI;
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tlli_info->sgsn_tlli.ptmsi = GSM_RESERVED_TMSI;
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return tlli_info;
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}
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static void gbproxy_detach_tlli_info(
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struct gbproxy_peer *peer,
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struct gbproxy_tlli_info *tlli_info)
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{
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struct gbproxy_patch_state *state = &peer->patch_state;
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llist_del(&tlli_info->list);
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OSMO_ASSERT(state->enabled_tllis_count > 0);
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state->enabled_tllis_count -= 1;
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peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current =
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state->enabled_tllis_count;
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}
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static void gbproxy_update_tlli_info(struct gbproxy_tlli_info *tlli_info,
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const uint8_t *imsi, size_t imsi_len)
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{
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if (!gprs_is_mi_imsi(imsi, imsi_len))
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return;
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tlli_info->mi_data_len = imsi_len;
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tlli_info->mi_data =
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talloc_realloc_size(tlli_info, tlli_info->mi_data, imsi_len);
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OSMO_ASSERT(tlli_info->mi_data != NULL);
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memcpy(tlli_info->mi_data, imsi, imsi_len);
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}
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void gbproxy_reassign_tlli(struct gbproxy_tlli_state *tlli_state,
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struct gbproxy_peer *peer, uint32_t new_tlli)
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{
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if (new_tlli == tlli_state->current)
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return;
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LOGP(DGPRS, LOGL_INFO,
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"The TLLI has been reassigned from %08x to %08x\n",
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tlli_state->current, new_tlli);
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/* Remember assigned TLLI */
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tlli_state->assigned = new_tlli;
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tlli_state->bss_validated = 0;
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tlli_state->net_validated = 0;
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}
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uint32_t gbproxy_map_tlli(uint32_t other_tlli,
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struct gbproxy_tlli_info *tlli_info, int to_bss)
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{
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uint32_t tlli = 0;
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struct gbproxy_tlli_state *src, *dst;
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if (to_bss) {
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src = &tlli_info->sgsn_tlli;
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dst = &tlli_info->tlli;
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} else {
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src = &tlli_info->tlli;
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dst = &tlli_info->sgsn_tlli;
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}
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if (src->current == other_tlli)
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tlli = dst->current;
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else if (src->assigned == other_tlli)
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tlli = dst->assigned;
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return tlli;
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}
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static void gbproxy_validate_tlli(struct gbproxy_tlli_state *tlli_state,
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uint32_t tlli, int to_bss)
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{
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LOGP(DGPRS, LOGL_DEBUG,
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"%s({current = %08x, assigned = %08x, net_vld = %d, bss_vld = %d}, %08x)\n",
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__func__, tlli_state->current, tlli_state->assigned,
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tlli_state->net_validated, tlli_state->bss_validated, tlli);
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if (!tlli_state->assigned || tlli_state->assigned != tlli)
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return;
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/* TODO: Is this ok? Check spec */
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if (gprs_tlli_type(tlli) != TLLI_LOCAL)
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return;
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/* See GSM 04.08, 4.7.1.5 */
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if (to_bss)
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tlli_state->net_validated = 1;
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else
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tlli_state->bss_validated = 1;
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if (!tlli_state->bss_validated || !tlli_state->net_validated)
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return;
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LOGP(DGPRS, LOGL_INFO,
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"The TLLI %08x has been validated (was %08x)\n",
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tlli_state->assigned, tlli_state->current);
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tlli_state->current = tlli;
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tlli_state->assigned = 0;
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}
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void gbproxy_touch_tlli(struct gbproxy_peer *peer,
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struct gbproxy_tlli_info *tlli_info, time_t now)
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{
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gbproxy_detach_tlli_info(peer, tlli_info);
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gbproxy_attach_tlli_info(peer, now, tlli_info);
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}
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struct gbproxy_tlli_info *gbproxy_register_tlli(
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struct gbproxy_peer *peer, uint32_t tlli,
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const uint8_t *imsi, size_t imsi_len, time_t now)
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{
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struct gbproxy_tlli_info *tlli_info;
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int enable_patching = -1;
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int tlli_already_known;
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/* Check, whether the IMSI matches */
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if (gprs_is_mi_imsi(imsi, imsi_len)) {
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enable_patching = gbproxy_check_imsi(peer, imsi, imsi_len);
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if (enable_patching < 0)
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return NULL;
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}
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tlli_info = gbproxy_find_tlli(peer, tlli);
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if (!tlli_info) {
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tlli_info = gbproxy_find_tlli_by_mi(peer, imsi, imsi_len);
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if (tlli_info) {
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/* TLLI has changed somehow, adjust it */
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LOGP(DGPRS, LOGL_INFO,
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"The TLLI has changed from %08x to %08x\n",
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tlli_info->tlli.current, tlli);
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tlli_info->tlli.current = tlli;
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}
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}
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if (!tlli_info) {
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tlli_info = gbproxy_tlli_info_alloc(peer);
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tlli_info->tlli.current = tlli;
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} else {
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gbproxy_detach_tlli_info(peer, tlli_info);
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tlli_already_known = 1;
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}
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OSMO_ASSERT(tlli_info != NULL);
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if (!tlli_already_known)
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LOGP(DGPRS, LOGL_INFO, "Adding TLLI %08x to list\n", tlli);
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gbproxy_attach_tlli_info(peer, now, tlli_info);
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gbproxy_update_tlli_info(tlli_info, imsi, imsi_len);
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if (enable_patching >= 0)
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tlli_info->enable_patching = enable_patching;
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return tlli_info;
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}
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static void gbproxy_unregister_tlli(struct gbproxy_peer *peer, uint32_t tlli)
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{
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struct gbproxy_tlli_info *tlli_info;
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tlli_info = gbproxy_find_tlli(peer, tlli);
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if (tlli_info) {
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LOGP(DGPRS, LOGL_INFO,
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"Removing TLLI %08x from list\n",
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tlli);
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gbproxy_delete_tlli(peer, tlli_info);
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}
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}
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int gbproxy_check_tlli(struct gbproxy_peer *peer, uint32_t tlli)
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{
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struct gbproxy_tlli_info *tlli_info;
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LOGP(DGPRS, LOGL_INFO, "Checking TLLI %08x, class: %d\n",
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tlli, gprs_tlli_type(tlli));
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if (!peer->cfg->check_imsi)
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return 1;
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tlli_info = gbproxy_find_tlli(peer, tlli);
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return tlli_info != NULL && tlli_info->enable_patching;
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}
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struct gbproxy_tlli_info *gbproxy_update_tlli_state_ul(
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struct gbproxy_peer *peer,
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time_t now,
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struct gprs_gb_parse_context *parse_ctx)
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{
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struct gbproxy_tlli_info *tlli_info = NULL;
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if (parse_ctx->tlli_enc)
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tlli_info = gbproxy_find_tlli(peer, parse_ctx->tlli);
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if (parse_ctx->tlli_enc && parse_ctx->llc) {
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uint32_t sgsn_tlli;
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if (!tlli_info) {
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tlli_info =
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gbproxy_register_tlli(peer, parse_ctx->tlli,
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parse_ctx->imsi,
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parse_ctx->imsi_len, now);
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/* Setup TLLIs */
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sgsn_tlli = gbproxy_make_sgsn_tlli(peer, tlli_info,
|
||
|
parse_ctx->tlli);
|
||
|
tlli_info->sgsn_tlli.current = sgsn_tlli;
|
||
|
} else {
|
||
|
sgsn_tlli = gbproxy_map_tlli(parse_ctx->tlli, tlli_info, 0);
|
||
|
if (!sgsn_tlli)
|
||
|
sgsn_tlli = gbproxy_make_sgsn_tlli(peer, tlli_info,
|
||
|
parse_ctx->tlli);
|
||
|
|
||
|
gbproxy_validate_tlli(&tlli_info->tlli,
|
||
|
parse_ctx->tlli, 0);
|
||
|
gbproxy_validate_tlli(&tlli_info->sgsn_tlli,
|
||
|
sgsn_tlli, 0);
|
||
|
gbproxy_touch_tlli(peer, tlli_info, now);
|
||
|
}
|
||
|
} else if (tlli_info) {
|
||
|
gbproxy_touch_tlli(peer, tlli_info, now);
|
||
|
}
|
||
|
|
||
|
if (parse_ctx->imsi && tlli_info && tlli_info->mi_data_len == 0) {
|
||
|
int enable_patching;
|
||
|
gbproxy_update_tlli_info(tlli_info,
|
||
|
parse_ctx->imsi, parse_ctx->imsi_len);
|
||
|
|
||
|
/* Check, whether the IMSI matches */
|
||
|
enable_patching = gbproxy_check_imsi(peer, parse_ctx->imsi,
|
||
|
parse_ctx->imsi_len);
|
||
|
if (enable_patching >= 0)
|
||
|
tlli_info->enable_patching = enable_patching;
|
||
|
}
|
||
|
|
||
|
return tlli_info;
|
||
|
}
|
||
|
|
||
|
struct gbproxy_tlli_info *gbproxy_update_tlli_state_dl(
|
||
|
struct gbproxy_peer *peer,
|
||
|
time_t now,
|
||
|
struct gprs_gb_parse_context *parse_ctx)
|
||
|
{
|
||
|
struct gbproxy_tlli_info *tlli_info = NULL;
|
||
|
|
||
|
if (parse_ctx->tlli_enc)
|
||
|
tlli_info = gbproxy_find_tlli_by_sgsn_tlli(peer, parse_ctx->tlli);
|
||
|
|
||
|
if (parse_ctx->tlli_enc && parse_ctx->new_ptmsi_enc) {
|
||
|
/* A new PTMSI has been signaled in the message,
|
||
|
* register new TLLI */
|
||
|
uint32_t new_sgsn_ptmsi;
|
||
|
uint32_t new_sgsn_tlli;
|
||
|
uint32_t new_bss_ptmsi;
|
||
|
uint32_t new_bss_tlli = 0;
|
||
|
if (!gprs_parse_mi_tmsi(parse_ctx->new_ptmsi_enc, GSM48_TMSI_LEN,
|
||
|
&new_sgsn_ptmsi)) {
|
||
|
LOGP(DGPRS, LOGL_ERROR,
|
||
|
"Failed to parse new TLLI/PTMSI (current is %08x)\n",
|
||
|
parse_ctx->tlli);
|
||
|
return tlli_info;
|
||
|
}
|
||
|
new_sgsn_tlli = gprs_tmsi2tlli(new_sgsn_ptmsi, TLLI_LOCAL);
|
||
|
new_bss_ptmsi = gbproxy_make_bss_ptmsi(peer, new_sgsn_ptmsi);
|
||
|
if (new_bss_ptmsi != GSM_RESERVED_TMSI)
|
||
|
new_bss_tlli = gprs_tmsi2tlli(new_bss_ptmsi, TLLI_LOCAL);
|
||
|
LOGP(DGPRS, LOGL_INFO,
|
||
|
"Got new TLLI(PTMSI) %08x(%08x) from SGSN, using %08x(%08x)\n",
|
||
|
new_sgsn_tlli, new_sgsn_ptmsi, new_bss_tlli, new_bss_ptmsi);
|
||
|
if (tlli_info) {
|
||
|
gbproxy_reassign_tlli(&tlli_info->sgsn_tlli,
|
||
|
peer, new_sgsn_tlli);
|
||
|
gbproxy_reassign_tlli(&tlli_info->tlli,
|
||
|
peer, new_bss_tlli);
|
||
|
gbproxy_touch_tlli(peer, tlli_info, now);
|
||
|
} else {
|
||
|
tlli_info = gbproxy_tlli_info_alloc(peer);
|
||
|
LOGP(DGPRS, LOGL_INFO,
|
||
|
"Adding TLLI %08x to list (SGSN, new P-TMSI)\n",
|
||
|
new_sgsn_tlli);
|
||
|
|
||
|
gbproxy_attach_tlli_info(peer, now, tlli_info);
|
||
|
/* Setup TLLIs */
|
||
|
tlli_info->sgsn_tlli.current = new_sgsn_tlli;
|
||
|
}
|
||
|
/* Setup PTMSIs */
|
||
|
tlli_info->sgsn_tlli.ptmsi = new_sgsn_ptmsi;
|
||
|
tlli_info->tlli.ptmsi = new_bss_ptmsi;
|
||
|
} else if (parse_ctx->tlli_enc && parse_ctx->llc && !tlli_info) {
|
||
|
/* Unknown SGSN TLLI */
|
||
|
tlli_info = gbproxy_tlli_info_alloc(peer);
|
||
|
LOGP(DGPRS, LOGL_INFO, "Adding TLLI %08x to list (SGSN)\n",
|
||
|
parse_ctx->tlli);
|
||
|
|
||
|
gbproxy_attach_tlli_info(peer, now, tlli_info);
|
||
|
/* Setup TLLIs */
|
||
|
tlli_info->sgsn_tlli.current = parse_ctx->tlli;
|
||
|
if (peer->cfg->patch_ptmsi) {
|
||
|
/* TODO: We don't know the local TLLI here, perhaps add
|
||
|
* a workaround that derives a PTMSI from the SGSN TLLI
|
||
|
* and use that to get the missing values. This may
|
||
|
* only happen when the gbproxy has been restarted or a
|
||
|
* tlli_info has been discarded due to age or queue
|
||
|
* length.
|
||
|
*/
|
||
|
tlli_info->tlli.current = 0;
|
||
|
} else {
|
||
|
tlli_info->tlli.current = tlli_info->sgsn_tlli.current;
|
||
|
}
|
||
|
} else if (parse_ctx->tlli_enc && parse_ctx->llc && tlli_info) {
|
||
|
uint32_t bss_tlli = gbproxy_map_tlli(parse_ctx->tlli,
|
||
|
tlli_info, 1);
|
||
|
gbproxy_validate_tlli(&tlli_info->sgsn_tlli, parse_ctx->tlli, 1);
|
||
|
gbproxy_validate_tlli(&tlli_info->tlli, bss_tlli, 1);
|
||
|
gbproxy_touch_tlli(peer, tlli_info, now);
|
||
|
} else if (tlli_info) {
|
||
|
gbproxy_touch_tlli(peer, tlli_info, now);
|
||
|
}
|
||
|
|
||
|
if (parse_ctx->imsi && tlli_info && tlli_info->mi_data_len == 0) {
|
||
|
int enable_patching;
|
||
|
gbproxy_update_tlli_info(tlli_info,
|
||
|
parse_ctx->imsi, parse_ctx->imsi_len);
|
||
|
|
||
|
/* Check, whether the IMSI matches */
|
||
|
enable_patching = gbproxy_check_imsi(peer, parse_ctx->imsi,
|
||
|
parse_ctx->imsi_len);
|
||
|
if (enable_patching >= 0)
|
||
|
tlli_info->enable_patching = enable_patching;
|
||
|
}
|
||
|
|
||
|
return tlli_info;
|
||
|
}
|
||
|
|
||
|
void gbproxy_update_tlli_state_after(
|
||
|
struct gbproxy_peer *peer,
|
||
|
struct gbproxy_tlli_info *tlli_info,
|
||
|
time_t now,
|
||
|
struct gprs_gb_parse_context *parse_ctx)
|
||
|
{
|
||
|
if (parse_ctx->invalidate_tlli)
|
||
|
gbproxy_unregister_tlli(peer, parse_ctx->tlli);
|
||
|
|
||
|
gbproxy_remove_stale_tllis(peer, now);
|
||
|
}
|
||
|
|
||
|
|