Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1 | /* Manage identity of neighboring BSS cells for inter-MSC handover. */ |
| 2 | /* |
Vadim Yanitskiy | 999a593 | 2023-05-18 17:22:26 +0700 | [diff] [blame] | 3 | * (C) 2018-2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 4 | * All Rights Reserved |
| 5 | * |
| 6 | * SPDX-License-Identifier: AGPL-3.0+ |
| 7 | * |
| 8 | * Author: Neels Hofmeyr |
| 9 | * Author: Stefan Sperling <ssperling@sysmocom.de> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU Affero General Public License as published by |
| 13 | * the Free Software Foundation; either version 3 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU Affero General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU Affero General Public License |
| 22 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 23 | */ |
| 24 | |
| 25 | #include <errno.h> |
| 26 | |
| 27 | #include <osmocom/core/linuxlist.h> |
| 28 | #include <osmocom/core/utils.h> |
| 29 | #include <osmocom/gsm/gsm0808.h> |
| 30 | #include <osmocom/sigtran/osmo_ss7.h> |
| 31 | #include <osmocom/sigtran/sccp_helpers.h> |
| 32 | |
| 33 | #include <osmocom/msc/neighbor_ident.h> |
| 34 | #include <osmocom/msc/gsm_data.h> |
| 35 | #include <osmocom/msc/sccp_ran.h> |
| 36 | #include <osmocom/msc/cell_id_list.h> |
| 37 | |
Harald Welte | 0d89bd5 | 2024-09-09 09:34:08 +0200 | [diff] [blame] | 38 | /* XXX greater than or equal to IPA_STRING_MAX (libosmocore) and MAX_PC_STR_LEN (libosmo-sigtran). */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 39 | #define NEIGHBOR_IDENT_ADDR_STRING_MAX 64 |
| 40 | |
| 41 | static struct gsm_network *gsmnet; |
| 42 | |
| 43 | void neighbor_ident_init(struct gsm_network *net) |
| 44 | { |
| 45 | gsmnet = net; |
| 46 | INIT_LLIST_HEAD(&gsmnet->neighbor_ident_list); |
| 47 | } |
| 48 | |
| 49 | int msc_ipa_name_from_str(struct msc_ipa_name *min, const char *name) |
| 50 | { |
| 51 | int rc = osmo_strlcpy(min->buf, name, sizeof(min->buf)); |
| 52 | if (rc >= sizeof(min->buf)) { |
| 53 | min->len = 0; |
| 54 | return -1; |
| 55 | } |
| 56 | min->len = rc; |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | int msc_ipa_name_cmp(const struct msc_ipa_name *a, const struct msc_ipa_name *b) |
| 61 | { |
| 62 | size_t cmp_len; |
| 63 | int rc; |
| 64 | if (a == b) |
| 65 | return 0; |
| 66 | if (!a || !b) |
| 67 | return a ? 1 : -1; |
| 68 | cmp_len = OSMO_MIN(sizeof(a->buf), OSMO_MIN(a->len, b->len)); |
| 69 | if (!cmp_len) |
| 70 | rc = 0; |
| 71 | else |
| 72 | rc = memcmp(a->buf, b->buf, cmp_len); |
| 73 | if (rc) |
| 74 | return rc; |
| 75 | if (a->len < b->len) |
| 76 | return -1; |
| 77 | if (a->len > b->len) |
| 78 | return 1; |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | const char *neighbor_ident_addr_name(const struct neighbor_ident_addr *nia) |
| 83 | { |
| 84 | static char buf[128]; |
| 85 | struct osmo_strbuf sb = { .buf = buf, .len = sizeof(buf) }; |
| 86 | |
| 87 | OSMO_STRBUF_PRINTF(sb, "%s-", osmo_rat_type_name(nia->ran_type)); |
| 88 | |
| 89 | switch (nia->type) { |
| 90 | case MSC_NEIGHBOR_TYPE_LOCAL_RAN_PEER: |
| 91 | OSMO_STRBUF_PRINTF(sb, "localRAN-%s", nia->local_ran_peer_pc_str); |
| 92 | break; |
| 93 | case MSC_NEIGHBOR_TYPE_REMOTE_MSC: |
| 94 | OSMO_STRBUF_PRINTF(sb, "remoteMSC-"); |
| 95 | OSMO_STRBUF_APPEND_NOLEN(sb, osmo_escape_str_buf2, nia->remote_msc_ipa_name.buf, |
| 96 | nia->remote_msc_ipa_name.len); |
| 97 | break; |
| 98 | default: |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | return buf; |
| 103 | } |
| 104 | |
| 105 | const struct neighbor_ident_entry *neighbor_ident_add(struct llist_head *ni_list, |
| 106 | const struct neighbor_ident_addr *nia, |
| 107 | const struct gsm0808_cell_id *cid) |
| 108 | { |
| 109 | struct neighbor_ident_entry *nie; |
| 110 | |
| 111 | if (!ni_list) |
| 112 | return NULL; |
| 113 | |
| 114 | nie = (struct neighbor_ident_entry*)neighbor_ident_find_by_addr(ni_list, nia); |
| 115 | if (!nie) { |
| 116 | nie = talloc_zero(gsmnet, struct neighbor_ident_entry); |
| 117 | OSMO_ASSERT(nie); |
| 118 | *nie = (struct neighbor_ident_entry){ |
| 119 | .addr = *nia, |
| 120 | }; |
| 121 | INIT_LLIST_HEAD(&nie->cell_ids); |
| 122 | llist_add_tail(&nie->entry, ni_list); |
| 123 | } |
| 124 | |
| 125 | cell_id_list_add_cell(nie, &nie->cell_ids, cid); |
| 126 | return nie; |
| 127 | } |
| 128 | |
| 129 | const struct neighbor_ident_entry *neighbor_ident_find_by_cell(const struct llist_head *ni_list, |
| 130 | enum osmo_rat_type ran_type, |
| 131 | const struct gsm0808_cell_id *cell_id) |
| 132 | { |
| 133 | struct neighbor_ident_entry *e; |
| 134 | llist_for_each_entry(e, ni_list, entry) { |
| 135 | if (ran_type != OSMO_RAT_UNKNOWN) { |
| 136 | if (e->addr.ran_type != ran_type) |
| 137 | continue; |
| 138 | } |
| 139 | |
| 140 | if (!cell_id_list_find(&e->cell_ids, cell_id, 0, false)) |
| 141 | continue; |
| 142 | return e; |
| 143 | } |
| 144 | return NULL; |
| 145 | } |
| 146 | |
| 147 | const struct neighbor_ident_entry *neighbor_ident_find_by_addr(const struct llist_head *ni_list, |
| 148 | const struct neighbor_ident_addr *nia) |
| 149 | { |
| 150 | struct neighbor_ident_entry *e; |
| 151 | |
| 152 | llist_for_each_entry(e, ni_list, entry) { |
| 153 | if (nia->ran_type != OSMO_RAT_UNKNOWN |
| 154 | && e->addr.ran_type != nia->ran_type) |
| 155 | continue; |
| 156 | |
| 157 | if (e->addr.type != nia->type) |
| 158 | continue; |
| 159 | |
| 160 | switch (e->addr.type) { |
| 161 | case MSC_NEIGHBOR_TYPE_LOCAL_RAN_PEER: |
| 162 | if (strcmp(e->addr.local_ran_peer_pc_str, nia->local_ran_peer_pc_str)) |
| 163 | continue; |
| 164 | break; |
| 165 | case MSC_NEIGHBOR_TYPE_REMOTE_MSC: |
| 166 | if (msc_ipa_name_cmp(&e->addr.remote_msc_ipa_name, &nia->remote_msc_ipa_name)) |
| 167 | continue; |
| 168 | break; |
| 169 | default: |
| 170 | continue; |
| 171 | } |
| 172 | |
| 173 | return e; |
| 174 | } |
| 175 | |
| 176 | return NULL; |
| 177 | } |
| 178 | |
| 179 | void neighbor_ident_del(const struct neighbor_ident_entry *nie) |
| 180 | { |
| 181 | struct neighbor_ident_entry *e = (struct neighbor_ident_entry*)nie; |
| 182 | llist_del(&e->entry); |
| 183 | talloc_free(e); |
| 184 | } |
| 185 | |
| 186 | void neighbor_ident_clear(struct llist_head *ni_list) |
| 187 | { |
| 188 | struct neighbor_ident_entry *nie; |
| 189 | while ((nie = llist_first_entry_or_null(ni_list, struct neighbor_ident_entry, entry))) |
| 190 | neighbor_ident_del(nie); |
| 191 | } |