Neels Hofmeyr | 6d804b1 | 2017-02-18 22:20:46 +0100 | [diff] [blame] | 1 | /* GSM subscriber details for use in BSC land */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 5 | * |
| 6 | * Author: Neels Hofmeyr <nhofmeyr@sysmocom.de> |
| 7 | * |
| 8 | * All Rights Reserved |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Affero General Public License as published by |
| 12 | * the Free Software Foundation; either version 3 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU Affero General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Affero General Public License |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <talloc.h> |
| 26 | #include <string.h> |
| 27 | #include <limits.h> |
| 28 | |
| 29 | #include <osmocom/gsm/gsm48.h> |
| 30 | #include <osmocom/core/logging.h> |
| 31 | |
| 32 | #include <openbsc/bsc_subscriber.h> |
| 33 | #include <openbsc/debug.h> |
| 34 | |
| 35 | static struct bsc_subscr *bsc_subscr_alloc(struct llist_head *list) |
| 36 | { |
| 37 | struct bsc_subscr *bsub; |
| 38 | |
| 39 | bsub = talloc_zero(list, struct bsc_subscr); |
| 40 | if (!bsub) |
| 41 | return NULL; |
| 42 | |
| 43 | llist_add_tail(&bsub->entry, list); |
| 44 | bsub->use_count = 1; |
| 45 | |
| 46 | return bsub; |
| 47 | } |
| 48 | |
| 49 | struct bsc_subscr *bsc_subscr_find_by_imsi(struct llist_head *list, |
| 50 | const char *imsi) |
| 51 | { |
| 52 | struct bsc_subscr *bsub; |
| 53 | |
| 54 | if (!imsi || !*imsi) |
| 55 | return NULL; |
| 56 | |
| 57 | llist_for_each_entry(bsub, list, entry) { |
| 58 | if (!strcmp(bsub->imsi, imsi)) |
| 59 | return bsc_subscr_get(bsub); |
| 60 | } |
| 61 | return NULL; |
| 62 | } |
| 63 | |
| 64 | struct bsc_subscr *bsc_subscr_find_by_tmsi(struct llist_head *list, |
| 65 | uint32_t tmsi) |
| 66 | { |
| 67 | struct bsc_subscr *bsub; |
| 68 | |
| 69 | if (tmsi == GSM_RESERVED_TMSI) |
| 70 | return NULL; |
| 71 | |
| 72 | llist_for_each_entry(bsub, list, entry) { |
| 73 | if (bsub->tmsi == tmsi) |
| 74 | return bsc_subscr_get(bsub); |
| 75 | } |
| 76 | return NULL; |
| 77 | } |
| 78 | |
| 79 | void bsc_subscr_set_imsi(struct bsc_subscr *bsub, const char *imsi) |
| 80 | { |
| 81 | if (!bsub) |
| 82 | return; |
Neels Hofmeyr | ca06e04 | 2017-03-08 18:30:22 +0100 | [diff] [blame] | 83 | osmo_strlcpy(bsub->imsi, imsi, sizeof(bsub->imsi)); |
Neels Hofmeyr | 6d804b1 | 2017-02-18 22:20:46 +0100 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | struct bsc_subscr *bsc_subscr_find_or_create_by_imsi(struct llist_head *list, |
| 87 | const char *imsi) |
| 88 | { |
| 89 | struct bsc_subscr *bsub; |
| 90 | bsub = bsc_subscr_find_by_imsi(list, imsi); |
| 91 | if (bsub) |
| 92 | return bsub; |
| 93 | bsub = bsc_subscr_alloc(list); |
| 94 | bsc_subscr_set_imsi(bsub, imsi); |
| 95 | return bsub; |
| 96 | } |
| 97 | |
| 98 | struct bsc_subscr *bsc_subscr_find_or_create_by_tmsi(struct llist_head *list, |
| 99 | uint32_t tmsi) |
| 100 | { |
| 101 | struct bsc_subscr *bsub; |
| 102 | bsub = bsc_subscr_find_by_tmsi(list, tmsi); |
| 103 | if (bsub) |
| 104 | return bsub; |
| 105 | bsub = bsc_subscr_alloc(list); |
| 106 | bsub->tmsi = tmsi; |
| 107 | return bsub; |
| 108 | } |
| 109 | |
| 110 | const char *bsc_subscr_name(struct bsc_subscr *bsub) |
| 111 | { |
| 112 | static char buf[32]; |
| 113 | if (!bsub) |
| 114 | return "unknown"; |
| 115 | if (bsub->imsi[0]) |
| 116 | snprintf(buf, sizeof(buf), "IMSI:%s", bsub->imsi); |
| 117 | else |
| 118 | snprintf(buf, sizeof(buf), "TMSI:0x%08x", bsub->tmsi); |
| 119 | return buf; |
| 120 | } |
| 121 | |
| 122 | static void bsc_subscr_free(struct bsc_subscr *bsub) |
| 123 | { |
| 124 | llist_del(&bsub->entry); |
| 125 | talloc_free(bsub); |
| 126 | } |
| 127 | |
| 128 | struct bsc_subscr *_bsc_subscr_get(struct bsc_subscr *bsub, |
| 129 | const char *file, int line) |
| 130 | { |
| 131 | OSMO_ASSERT(bsub->use_count < INT_MAX); |
| 132 | bsub->use_count++; |
| 133 | LOGPSRC(DREF, LOGL_DEBUG, file, line, |
| 134 | "BSC subscr %s usage increases to: %d\n", |
| 135 | bsc_subscr_name(bsub), bsub->use_count); |
| 136 | return bsub; |
| 137 | } |
| 138 | |
| 139 | struct bsc_subscr *_bsc_subscr_put(struct bsc_subscr *bsub, |
| 140 | const char *file, int line) |
| 141 | { |
| 142 | bsub->use_count--; |
| 143 | LOGPSRC(DREF, bsub->use_count >= 0? LOGL_DEBUG : LOGL_ERROR, |
| 144 | file, line, |
| 145 | "BSC subscr %s usage decreases to: %d\n", |
| 146 | bsc_subscr_name(bsub), bsub->use_count); |
| 147 | if (bsub->use_count <= 0) |
| 148 | bsc_subscr_free(bsub); |
| 149 | return NULL; |
| 150 | } |
| 151 | |
| 152 | void log_set_filter_bsc_subscr(struct log_target *target, |
| 153 | struct bsc_subscr *bsc_subscr) |
| 154 | { |
| 155 | struct bsc_subscr **fsub = (void*)&target->filter_data[LOG_FLT_BSC_SUBSCR]; |
| 156 | |
| 157 | /* free the old data */ |
| 158 | if (*fsub) { |
| 159 | bsc_subscr_put(*fsub); |
| 160 | *fsub = NULL; |
| 161 | } |
| 162 | |
| 163 | if (bsc_subscr) { |
| 164 | target->filter_map |= (1 << LOG_FLT_BSC_SUBSCR); |
| 165 | *fsub = bsc_subscr_get(bsc_subscr); |
| 166 | } else |
| 167 | target->filter_map &= ~(1 << LOG_FLT_BSC_SUBSCR); |
| 168 | } |