Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 1 | /* OpenBSC minimal LAPD implementation */ |
| 2 | |
| 3 | /* (C) 2009 by oystein@homelien.no |
| 4 | * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 5 | * (C) 2010 by Digium and Matthew Fredrickson <creslin@digium.com> |
| 6 | * (C) 2011 by Harald Welte <laforge@gnumonks.org> |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 7 | * (C) 2011 by Andreas Eversberg <jolly@eversberg.eu> |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 8 | * |
| 9 | * All Rights Reserved |
| 10 | * |
Harald Welte | 323d39d | 2017-11-13 01:09:21 +0900 | [diff] [blame] | 11 | * SPDX-License-Identifier: GPL-2.0+ |
| 12 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License along |
| 24 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 25 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 26 | * |
| 27 | */ |
| 28 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 29 | #include "internal.h" |
| 30 | |
| 31 | #include <stdio.h> |
| 32 | #include <string.h> |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 33 | #include <errno.h> |
| 34 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 35 | #include <osmocom/core/linuxlist.h> |
| 36 | #include <osmocom/core/logging.h> |
Harald Welte | 71d87b2 | 2011-07-18 14:49:56 +0200 | [diff] [blame] | 37 | #include <osmocom/core/talloc.h> |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 38 | #include <osmocom/core/msgb.h> |
| 39 | #include <osmocom/core/timer.h> |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 40 | #include <osmocom/abis/lapd.h> |
Pablo Neira Ayuso | 9530600 | 2012-08-22 16:43:59 +0200 | [diff] [blame] | 41 | #include <osmocom/abis/lapd_pcap.h> |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 42 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 43 | #define LAPD_ADDR2(sapi, cr) ((((sapi) & 0x3f) << 2) | (((cr) & 0x1) << 1)) |
| 44 | #define LAPD_ADDR3(tei) ((((tei) & 0x7f) << 1) | 0x1) |
| 45 | |
| 46 | #define LAPD_ADDR_SAPI(addr) ((addr) >> 2) |
| 47 | #define LAPD_ADDR_CR(addr) (((addr) >> 1) & 0x1) |
| 48 | #define LAPD_ADDR_EA(addr) ((addr) & 0x1) |
| 49 | #define LAPD_ADDR_TEI(addr) ((addr) >> 1) |
| 50 | |
| 51 | #define LAPD_CTRL_I4(ns) (((ns) & 0x7f) << 1) |
| 52 | #define LAPD_CTRL_I5(nr, p) ((((nr) & 0x7f) << 1) | ((p) & 0x1)) |
| 53 | #define LAPD_CTRL_S4(s) ((((s) & 0x3) << 2) | 0x1) |
| 54 | #define LAPD_CTRL_S5(nr, p) ((((nr) & 0x7f) << 1) | ((p) & 0x1)) |
| 55 | #define LAPD_CTRL_U4(u, p) ((((u) & 0x1c) << (5-2)) | (((p) & 0x1) << 4) | (((u) & 0x3) << 2) | 0x3) |
| 56 | |
| 57 | #define LAPD_CTRL_is_I(ctrl) (((ctrl) & 0x1) == 0) |
| 58 | #define LAPD_CTRL_is_S(ctrl) (((ctrl) & 0x3) == 1) |
| 59 | #define LAPD_CTRL_is_U(ctrl) (((ctrl) & 0x3) == 3) |
| 60 | |
| 61 | #define LAPD_CTRL_U_BITS(ctrl) ((((ctrl) & 0xC) >> 2) | ((ctrl) & 0xE0) >> 3) |
| 62 | #define LAPD_CTRL_U_PF(ctrl) (((ctrl) >> 4) & 0x1) |
| 63 | |
| 64 | #define LAPD_CTRL_S_BITS(ctrl) (((ctrl) & 0xC) >> 2) |
| 65 | #define LAPD_CTRL_S_PF(ctrl) (ctrl & 0x1) |
| 66 | |
| 67 | #define LAPD_CTRL_I_Ns(ctrl) (((ctrl) & 0xFE) >> 1) |
| 68 | #define LAPD_CTRL_I_P(ctrl) (ctrl & 0x1) |
| 69 | #define LAPD_CTRL_Nr(ctrl) (((ctrl) & 0xFE) >> 1) |
| 70 | |
| 71 | #define LAPD_LEN(len) ((len << 2) | 0x1) |
| 72 | #define LAPD_EL 0x1 |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 73 | |
Andreas Eversberg | 3c46044 | 2011-09-28 02:46:16 +0200 | [diff] [blame] | 74 | #define LAPD_SET_K(n, o) {n,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o} |
| 75 | |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 76 | const struct lapd_profile lapd_profile_isdn = { |
Pablo Neira Ayuso | f42280b | 2012-03-12 18:17:31 +0100 | [diff] [blame] | 77 | .k = LAPD_SET_K(7,7), |
| 78 | .n200 = 3, |
| 79 | .n201 = 260, |
| 80 | .n202 = 3, |
| 81 | .t200_sec = 1, .t200_usec = 0, |
| 82 | .t201_sec = 1, .t201_usec = 0, |
| 83 | .t202_sec = 2, .t202_usec = 0, |
| 84 | .t203_sec = 10, .t203_usec = 0, |
| 85 | .short_address = 0 |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | const struct lapd_profile lapd_profile_abis = { |
Pablo Neira Ayuso | f42280b | 2012-03-12 18:17:31 +0100 | [diff] [blame] | 89 | .k = LAPD_SET_K(2,1), |
| 90 | .n200 = 3, |
| 91 | .n201 = 260, |
| 92 | .n202 = 0, /* infinite */ |
| 93 | .t200_sec = 0, .t200_usec = 240000, |
| 94 | .t201_sec = 1, .t201_usec = 0, |
| 95 | .t202_sec = 2, .t202_usec = 0, |
| 96 | .t203_sec = 10, .t203_usec = 0, |
| 97 | .short_address = 0 |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 98 | }; |
| 99 | |
Philipp | 0c7d5f4 | 2016-10-19 18:38:58 +0200 | [diff] [blame] | 100 | /* Ericssons OM2000 lapd dialect requires a sabm frame retransmission |
| 101 | * timeout of exactly 300 msek. Shorter or longer retransmission will |
| 102 | * cause the link establishment to fail permanently. Since the BTS is |
| 103 | * periodically scanning through all timeslots to find the timeslot |
| 104 | * where the bsc is transmitting its sabm frames the normal maximum |
| 105 | * retransmission (n200) of 3 is not enough. In order not to miss |
Philipp Maier | d75bac4 | 2017-02-01 13:51:03 +0100 | [diff] [blame] | 106 | * the bts, n200 has been increased to 50, which is an educated |
Philipp | 0c7d5f4 | 2016-10-19 18:38:58 +0200 | [diff] [blame] | 107 | * guess. */ |
| 108 | |
| 109 | const struct lapd_profile lapd_profile_abis_ericsson = { |
| 110 | .k = LAPD_SET_K(2,1), |
Philipp Maier | d75bac4 | 2017-02-01 13:51:03 +0100 | [diff] [blame] | 111 | .n200 = 50, |
Philipp | 0c7d5f4 | 2016-10-19 18:38:58 +0200 | [diff] [blame] | 112 | .n201 = 260, |
| 113 | .n202 = 0, /* infinite */ |
| 114 | .t200_sec = 0, .t200_usec = 300000, |
| 115 | .t201_sec = 1, .t201_usec = 0, |
| 116 | .t202_sec = 2, .t202_usec = 0, |
| 117 | .t203_sec = 10, .t203_usec = 0, |
| 118 | .short_address = 0 |
| 119 | }; |
| 120 | |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 121 | const struct lapd_profile lapd_profile_sat = { |
Pablo Neira Ayuso | f42280b | 2012-03-12 18:17:31 +0100 | [diff] [blame] | 122 | .k = LAPD_SET_K(15,15), |
| 123 | .n200 = 5, |
| 124 | .n201 = 260, |
| 125 | .n202 = 5, |
| 126 | .t200_sec = 2, .t200_usec = 400000, |
| 127 | .t201_sec = 2, .t201_usec = 400000, |
| 128 | .t202_sec = 2, .t202_usec = 400000, |
Holger Hans Peter Freyther | 4b6860d | 2013-03-09 17:32:33 +0100 | [diff] [blame] | 129 | .t203_sec = 20, .t203_usec = 0, |
Pablo Neira Ayuso | f42280b | 2012-03-12 18:17:31 +0100 | [diff] [blame] | 130 | .short_address = 1 |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 131 | }; |
| 132 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 133 | typedef enum { |
| 134 | LAPD_TEI_NONE = 0, |
| 135 | LAPD_TEI_ASSIGNED, |
| 136 | LAPD_TEI_ACTIVE, |
| 137 | } lapd_tei_state; |
| 138 | |
| 139 | const char *lapd_tei_states[] = { |
| 140 | "NONE", |
| 141 | "ASSIGNED", |
| 142 | "ACTIVE", |
| 143 | }; |
| 144 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 145 | /* Structure representing an allocated TEI within a LAPD instance. */ |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 146 | struct lapd_tei { |
| 147 | struct llist_head list; |
| 148 | struct lapd_instance *li; |
| 149 | uint8_t tei; |
| 150 | lapd_tei_state state; |
| 151 | |
| 152 | struct llist_head sap_list; |
| 153 | }; |
| 154 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 155 | /* Structure representing a SAP within a TEI. It includes exactly one datalink |
| 156 | * instance. */ |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 157 | struct lapd_sap { |
| 158 | struct llist_head list; |
| 159 | struct lapd_tei *tei; |
| 160 | uint8_t sapi; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 161 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 162 | struct lapd_datalink dl; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 163 | }; |
| 164 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 165 | /* Resolve TEI structure from given numeric TEI */ |
| 166 | static struct lapd_tei *teip_from_tei(struct lapd_instance *li, uint8_t tei) |
| 167 | { |
| 168 | struct lapd_tei *lt; |
| 169 | |
| 170 | llist_for_each_entry(lt, &li->tei_list, list) { |
| 171 | if (lt->tei == tei) |
| 172 | return lt; |
| 173 | } |
| 174 | return NULL; |
| 175 | }; |
| 176 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 177 | /* Change state of TEI */ |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 178 | static void lapd_tei_set_state(struct lapd_tei *teip, int newstate) |
| 179 | { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 180 | LOGP(DLLAPD, LOGL_INFO, "LAPD state change on TEI %d: %s -> %s\n", |
| 181 | teip->tei, lapd_tei_states[teip->state], |
| 182 | lapd_tei_states[newstate]); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 183 | teip->state = newstate; |
| 184 | }; |
| 185 | |
| 186 | /* Allocate a new TEI */ |
| 187 | struct lapd_tei *lapd_tei_alloc(struct lapd_instance *li, uint8_t tei) |
| 188 | { |
| 189 | struct lapd_tei *teip; |
| 190 | |
| 191 | teip = talloc_zero(li, struct lapd_tei); |
| 192 | if (!teip) |
| 193 | return NULL; |
| 194 | |
| 195 | teip->li = li; |
| 196 | teip->tei = tei; |
| 197 | llist_add(&teip->list, &li->tei_list); |
| 198 | INIT_LLIST_HEAD(&teip->sap_list); |
| 199 | |
| 200 | lapd_tei_set_state(teip, LAPD_TEI_ASSIGNED); |
| 201 | |
| 202 | return teip; |
| 203 | } |
| 204 | |
| 205 | /* Find a SAP within a given TEI */ |
| 206 | static struct lapd_sap *lapd_sap_find(struct lapd_tei *teip, uint8_t sapi) |
| 207 | { |
| 208 | struct lapd_sap *sap; |
| 209 | |
| 210 | llist_for_each_entry(sap, &teip->sap_list, list) { |
| 211 | if (sap->sapi == sapi) |
| 212 | return sap; |
| 213 | } |
| 214 | |
| 215 | return NULL; |
| 216 | } |
| 217 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 218 | static int send_ph_data_req(struct lapd_msg_ctx *lctx, struct msgb *msg); |
| 219 | static int send_dlsap(struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 220 | |
| 221 | /* Allocate a new SAP within a given TEI */ |
| 222 | static struct lapd_sap *lapd_sap_alloc(struct lapd_tei *teip, uint8_t sapi) |
| 223 | { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 224 | struct lapd_sap *sap; |
| 225 | struct lapd_datalink *dl; |
| 226 | struct lapd_instance *li; |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 227 | struct lapd_profile *profile; |
| 228 | int k; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 229 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 230 | sap = talloc_zero(teip, struct lapd_sap); |
| 231 | if (!sap) |
| 232 | return NULL; |
| 233 | |
Philipp Maier | 027e119 | 2016-12-08 17:17:33 +0100 | [diff] [blame] | 234 | LOGP(DLLAPD, LOGL_NOTICE, |
| 235 | "LAPD Allocating SAP for SAPI=%u / TEI=%u (dl=%p, sap=%p)\n", |
| 236 | sapi, teip->tei, &sap->dl, sap); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 237 | |
| 238 | sap->sapi = sapi; |
| 239 | sap->tei = teip; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 240 | dl = &sap->dl; |
| 241 | li = teip->li; |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 242 | profile = &li->profile; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 243 | |
Andreas Eversberg | 3c46044 | 2011-09-28 02:46:16 +0200 | [diff] [blame] | 244 | k = profile->k[sapi & 0x3f]; |
| 245 | LOGP(DLLAPD, LOGL_NOTICE, "k=%d N200=%d N201=%d T200=%d.%d T203=%d.%d" |
| 246 | "\n", k, profile->n200, profile->n201, profile->t200_sec, |
| 247 | profile->t200_usec, profile->t203_sec, profile->t203_usec); |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 248 | lapd_dl_init(dl, k, 128, profile->n201); |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 249 | dl->use_sabme = 1; /* use SABME instead of SABM (GSM) */ |
| 250 | dl->send_ph_data_req = send_ph_data_req; |
| 251 | dl->send_dlsap = send_dlsap; |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 252 | dl->n200 = profile->n200; |
| 253 | dl->n200_est_rel = profile->n200; |
| 254 | dl->t200_sec = profile->t200_sec; dl->t200_usec = profile->t200_usec; |
| 255 | dl->t203_sec = profile->t203_sec; dl->t203_usec = profile->t203_usec; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 256 | dl->lctx.dl = &sap->dl; |
| 257 | dl->lctx.sapi = sapi; |
| 258 | dl->lctx.tei = teip->tei; |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 259 | dl->lctx.n201 = profile->n201; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 260 | |
| 261 | lapd_set_mode(&sap->dl, (teip->li->network_side) ? LAPD_MODE_NETWORK |
| 262 | : LAPD_MODE_USER); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 263 | |
| 264 | llist_add(&sap->list, &teip->sap_list); |
| 265 | |
| 266 | return sap; |
| 267 | } |
| 268 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 269 | /* Free SAP instance, including the datalink */ |
| 270 | static void lapd_sap_free(struct lapd_sap *sap) |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 271 | { |
Philipp Maier | 027e119 | 2016-12-08 17:17:33 +0100 | [diff] [blame] | 272 | LOGP(DLLAPD, LOGL_NOTICE, |
| 273 | "LAPD Freeing SAP for SAPI=%u / TEI=%u (dl=%p, sap=%p)\n", |
| 274 | sap->sapi, sap->tei->tei, &sap->dl, sap); |
| 275 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 276 | /* free datalink structures and timers */ |
| 277 | lapd_dl_exit(&sap->dl); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 278 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 279 | llist_del(&sap->list); |
| 280 | talloc_free(sap); |
| 281 | } |
| 282 | |
| 283 | /* Free TEI instance */ |
| 284 | static void lapd_tei_free(struct lapd_tei *teip) |
| 285 | { |
| 286 | struct lapd_sap *sap, *sap2; |
| 287 | |
| 288 | llist_for_each_entry_safe(sap, sap2, &teip->sap_list, list) { |
| 289 | lapd_sap_free(sap); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 290 | } |
| 291 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 292 | llist_del(&teip->list); |
| 293 | talloc_free(teip); |
| 294 | } |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 295 | |
| 296 | /* Input function into TEI manager */ |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 297 | static int lapd_tei_receive(struct lapd_instance *li, uint8_t *data, int len) |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 298 | { |
Andreas Eversberg | 8aaed05 | 2011-10-01 04:10:57 +0200 | [diff] [blame] | 299 | uint8_t entity; |
| 300 | uint8_t ref; |
| 301 | uint8_t mt; |
| 302 | uint8_t action; |
| 303 | uint8_t e; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 304 | uint8_t resp[8]; |
| 305 | struct lapd_tei *teip; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 306 | struct msgb *msg; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 307 | |
Andreas Eversberg | 8aaed05 | 2011-10-01 04:10:57 +0200 | [diff] [blame] | 308 | if (len < 5) { |
| 309 | LOGP(DLLAPD, LOGL_ERROR, "LAPD TEIMGR frame receive len %d < 5" |
| 310 | ", ignoring\n", len); |
| 311 | return -EINVAL; |
| 312 | }; |
| 313 | |
| 314 | entity = data[0]; |
| 315 | ref = data[1]; |
| 316 | mt = data[3]; |
| 317 | action = data[4] >> 1; |
| 318 | e = data[4] & 1; |
| 319 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 320 | DEBUGP(DLLAPD, "LAPD TEIMGR: entity %x, ref %x, mt %x, action %x, " |
| 321 | "e %x\n", entity, ref, mt, action, e); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 322 | |
| 323 | switch (mt) { |
| 324 | case 0x01: /* IDENTITY REQUEST */ |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 325 | DEBUGP(DLLAPD, "LAPD TEIMGR: identity request for TEI %u\n", |
| 326 | action); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 327 | |
| 328 | teip = teip_from_tei(li, action); |
| 329 | if (!teip) { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 330 | LOGP(DLLAPD, LOGL_INFO, "TEI MGR: New TEI %u\n", |
| 331 | action); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 332 | teip = lapd_tei_alloc(li, action); |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 333 | if (!teip) |
| 334 | return -ENOMEM; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | /* Send ACCEPT */ |
| 338 | memmove(resp, "\xfe\xff\x03\x0f\x00\x00\x02\x00", 8); |
| 339 | resp[7] = (action << 1) | 1; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 340 | msg = msgb_alloc_headroom(56, 56, "DL EST"); |
| 341 | msg->l2h = msgb_push(msg, 8); |
| 342 | memcpy(msg->l2h, resp, 8); |
Pablo Neira Ayuso | 9530600 | 2012-08-22 16:43:59 +0200 | [diff] [blame] | 343 | |
| 344 | /* write to PCAP file, if enabled. */ |
| 345 | osmo_pcap_lapd_write(li->pcap_fd, OSMO_LAPD_PCAP_OUTPUT, msg); |
| 346 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 347 | LOGP(DLLAPD, LOGL_DEBUG, "TX: %s\n", |
| 348 | osmo_hexdump(msg->data, msg->len)); |
| 349 | li->transmit_cb(msg, li->transmit_cbdata); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 350 | |
| 351 | if (teip->state == LAPD_TEI_NONE) |
| 352 | lapd_tei_set_state(teip, LAPD_TEI_ASSIGNED); |
| 353 | break; |
| 354 | default: |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 355 | LOGP(DLLAPD, LOGL_NOTICE, "LAPD TEIMGR: unknown mt %x " |
| 356 | "action %x\n", mt, action); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 357 | break; |
| 358 | }; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 359 | |
| 360 | return 0; |
| 361 | } |
| 362 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 363 | /* General input function for any data received for this LAPD instance */ |
| 364 | int lapd_receive(struct lapd_instance *li, struct msgb *msg, int *error) |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 365 | { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 366 | int i; |
| 367 | struct lapd_msg_ctx lctx; |
| 368 | int rc; |
| 369 | struct lapd_sap *sap; |
| 370 | struct lapd_tei *teip; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 371 | |
Pablo Neira Ayuso | 9530600 | 2012-08-22 16:43:59 +0200 | [diff] [blame] | 372 | /* write to PCAP file, if enabled. */ |
| 373 | osmo_pcap_lapd_write(li->pcap_fd, OSMO_LAPD_PCAP_INPUT, msg); |
| 374 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 375 | LOGP(DLLAPD, LOGL_DEBUG, "RX: %s\n", osmo_hexdump(msg->data, msg->len)); |
| 376 | if (msg->len < 2) { |
Andreas Eversberg | 8aaed05 | 2011-10-01 04:10:57 +0200 | [diff] [blame] | 377 | LOGP(DLLAPD, LOGL_ERROR, "LAPD frame receive len %d < 2, " |
| 378 | "ignoring\n", msg->len); |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 379 | *error = LAPD_ERR_BAD_LEN; |
| 380 | return -EINVAL; |
| 381 | }; |
| 382 | msg->l2h = msg->data; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 383 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 384 | memset(&lctx, 0, sizeof(lctx)); |
| 385 | |
| 386 | i = 0; |
| 387 | /* adress field */ |
| 388 | lctx.sapi = LAPD_ADDR_SAPI(msg->l2h[i]); |
| 389 | lctx.cr = LAPD_ADDR_CR(msg->l2h[i]); |
| 390 | lctx.lpd = 0; |
| 391 | if (!LAPD_ADDR_EA(msg->l2h[i])) { |
Andreas Eversberg | 8aaed05 | 2011-10-01 04:10:57 +0200 | [diff] [blame] | 392 | if (msg->len < 3) { |
| 393 | LOGP(DLLAPD, LOGL_ERROR, "LAPD frame with TEI receive " |
| 394 | "len %d < 3, ignoring\n", msg->len); |
| 395 | *error = LAPD_ERR_BAD_LEN; |
| 396 | return -EINVAL; |
| 397 | }; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 398 | i++; |
| 399 | lctx.tei = LAPD_ADDR_TEI(msg->l2h[i]); |
| 400 | } |
| 401 | i++; |
| 402 | /* control field */ |
| 403 | if (LAPD_CTRL_is_I(msg->l2h[i])) { |
| 404 | lctx.format = LAPD_FORM_I; |
| 405 | lctx.n_send = LAPD_CTRL_I_Ns(msg->l2h[i]); |
| 406 | i++; |
Andreas Eversberg | 8aaed05 | 2011-10-01 04:10:57 +0200 | [diff] [blame] | 407 | if (msg->len < 3 && i == 2) { |
| 408 | LOGP(DLLAPD, LOGL_ERROR, "LAPD I frame without TEI " |
| 409 | "receive len %d < 3, ignoring\n", msg->len); |
| 410 | *error = LAPD_ERR_BAD_LEN; |
| 411 | return -EINVAL; |
| 412 | }; |
| 413 | if (msg->len < 4 && i == 3) { |
| 414 | LOGP(DLLAPD, LOGL_ERROR, "LAPD I frame with TEI " |
| 415 | "receive len %d < 4, ignoring\n", msg->len); |
| 416 | *error = LAPD_ERR_BAD_LEN; |
| 417 | return -EINVAL; |
| 418 | }; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 419 | lctx.n_recv = LAPD_CTRL_Nr(msg->l2h[i]); |
| 420 | lctx.p_f = LAPD_CTRL_I_P(msg->l2h[i]); |
| 421 | } else if (LAPD_CTRL_is_S(msg->l2h[i])) { |
| 422 | lctx.format = LAPD_FORM_S; |
| 423 | lctx.s_u = LAPD_CTRL_S_BITS(msg->l2h[i]); |
| 424 | i++; |
Andreas Eversberg | 8aaed05 | 2011-10-01 04:10:57 +0200 | [diff] [blame] | 425 | if (msg->len < 3 && i == 2) { |
| 426 | LOGP(DLLAPD, LOGL_ERROR, "LAPD S frame without TEI " |
| 427 | "receive len %d < 3, ignoring\n", msg->len); |
| 428 | *error = LAPD_ERR_BAD_LEN; |
| 429 | return -EINVAL; |
| 430 | }; |
| 431 | if (msg->len < 4 && i == 3) { |
| 432 | LOGP(DLLAPD, LOGL_ERROR, "LAPD S frame with TEI " |
| 433 | "receive len %d < 4, ignoring\n", msg->len); |
| 434 | *error = LAPD_ERR_BAD_LEN; |
| 435 | return -EINVAL; |
| 436 | }; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 437 | lctx.n_recv = LAPD_CTRL_Nr(msg->l2h[i]); |
| 438 | lctx.p_f = LAPD_CTRL_S_PF(msg->l2h[i]); |
| 439 | } else if (LAPD_CTRL_is_U(msg->l2h[i])) { |
| 440 | lctx.format = LAPD_FORM_U; |
| 441 | lctx.s_u = LAPD_CTRL_U_BITS(msg->l2h[i]); |
| 442 | lctx.p_f = LAPD_CTRL_U_PF(msg->l2h[i]); |
| 443 | } else |
| 444 | lctx.format = LAPD_FORM_UKN; |
| 445 | i++; |
| 446 | /* length */ |
| 447 | msg->l3h = msg->l2h + i; |
| 448 | msgb_pull(msg, i); |
| 449 | lctx.length = msg->len; |
| 450 | |
| 451 | /* perform TEI assignment, if received */ |
| 452 | if (lctx.tei == 127) { |
| 453 | rc = lapd_tei_receive(li, msg->data, msg->len); |
| 454 | msgb_free(msg); |
| 455 | return rc; |
| 456 | } |
| 457 | |
| 458 | /* resolve TEI and SAPI */ |
| 459 | teip = teip_from_tei(li, lctx.tei); |
| 460 | if (!teip) { |
| 461 | LOGP(DLLAPD, LOGL_NOTICE, "LAPD Unknown TEI %u\n", lctx.tei); |
| 462 | *error = LAPD_ERR_UNKNOWN_TEI; |
| 463 | msgb_free(msg); |
| 464 | return -EINVAL; |
| 465 | } |
| 466 | sap = lapd_sap_find(teip, lctx.sapi); |
| 467 | if (!sap) { |
| 468 | LOGP(DLLAPD, LOGL_INFO, "LAPD No SAP for TEI=%u / SAPI=%u, " |
| 469 | "allocating\n", lctx.tei, lctx.sapi); |
| 470 | sap = lapd_sap_alloc(teip, lctx.sapi); |
| 471 | if (!sap) { |
| 472 | *error = LAPD_ERR_NO_MEM; |
| 473 | msgb_free(msg); |
| 474 | return -ENOMEM; |
| 475 | } |
| 476 | } |
| 477 | lctx.dl = &sap->dl; |
| 478 | lctx.n201 = lctx.dl->maxf; |
| 479 | |
| 480 | if (msg->len > lctx.n201) { |
| 481 | LOGP(DLLAPD, LOGL_ERROR, "message len %d > N201(%d) " |
| 482 | "(discarding)\n", msg->len, lctx.n201); |
| 483 | msgb_free(msg); |
| 484 | *error = LAPD_ERR_BAD_LEN; |
| 485 | return -EINVAL; |
| 486 | } |
| 487 | |
| 488 | /* send to LAPD */ |
| 489 | return lapd_ph_data_ind(msg, &lctx); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | /* Start a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */ |
| 493 | int lapd_sap_start(struct lapd_instance *li, uint8_t tei, uint8_t sapi) |
| 494 | { |
| 495 | struct lapd_sap *sap; |
| 496 | struct lapd_tei *teip; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 497 | struct osmo_dlsap_prim dp; |
| 498 | struct msgb *msg; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 499 | |
| 500 | teip = teip_from_tei(li, tei); |
| 501 | if (!teip) |
| 502 | teip = lapd_tei_alloc(li, tei); |
| 503 | |
| 504 | sap = lapd_sap_find(teip, sapi); |
| 505 | if (sap) |
| 506 | return -EEXIST; |
| 507 | |
| 508 | sap = lapd_sap_alloc(teip, sapi); |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 509 | if (!sap) |
| 510 | return -ENOMEM; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 511 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 512 | LOGP(DLLAPD, LOGL_NOTICE, "LAPD DL-ESTABLISH request TEI=%d SAPI=%d\n", |
| 513 | tei, sapi); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 514 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 515 | /* prepare prim */ |
| 516 | msg = msgb_alloc_headroom(56, 56, "DL EST"); |
| 517 | msg->l3h = msg->data; |
| 518 | osmo_prim_init(&dp.oph, 0, PRIM_DL_EST, PRIM_OP_REQUEST, msg); |
| 519 | |
| 520 | /* send to L2 */ |
| 521 | return lapd_recv_dlsap(&dp, &sap->dl.lctx); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /* Stop a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */ |
| 525 | int lapd_sap_stop(struct lapd_instance *li, uint8_t tei, uint8_t sapi) |
| 526 | { |
| 527 | struct lapd_tei *teip; |
| 528 | struct lapd_sap *sap; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 529 | struct osmo_dlsap_prim dp; |
| 530 | struct msgb *msg; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 531 | |
| 532 | teip = teip_from_tei(li, tei); |
| 533 | if (!teip) |
| 534 | return -ENODEV; |
| 535 | |
| 536 | sap = lapd_sap_find(teip, sapi); |
| 537 | if (!sap) |
| 538 | return -ENODEV; |
| 539 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 540 | LOGP(DLLAPD, LOGL_NOTICE, "LAPD DL-RELEASE request TEI=%d SAPI=%d\n", |
| 541 | tei, sapi); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 542 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 543 | /* prepare prim */ |
| 544 | msg = msgb_alloc_headroom(56, 56, "DL REL"); |
| 545 | msg->l3h = msg->data; |
| 546 | osmo_prim_init(&dp.oph, 0, PRIM_DL_REL, PRIM_OP_REQUEST, msg); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 547 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 548 | /* send to L2 */ |
| 549 | return lapd_recv_dlsap(&dp, &sap->dl.lctx); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 550 | } |
| 551 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 552 | /* Transmit Data (DL-DATA request) on the given LAPD Instance / TEI / SAPI */ |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 553 | void lapd_transmit(struct lapd_instance *li, uint8_t tei, uint8_t sapi, |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 554 | struct msgb *msg) |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 555 | { |
| 556 | struct lapd_tei *teip = teip_from_tei(li, tei); |
| 557 | struct lapd_sap *sap; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 558 | struct osmo_dlsap_prim dp; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 559 | |
| 560 | if (!teip) { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 561 | LOGP(DLLAPD, LOGL_ERROR, "LAPD Cannot transmit on " |
Harald Welte | 4ca16c7 | 2011-08-16 14:01:49 +0200 | [diff] [blame] | 562 | "non-existing TEI %u\n", tei); |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 563 | msgb_free(msg); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 564 | return; |
| 565 | } |
| 566 | |
| 567 | sap = lapd_sap_find(teip, sapi); |
| 568 | if (!sap) { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 569 | LOGP(DLLAPD, LOGL_INFO, "LAPD Tx on unknown SAPI=%u " |
| 570 | "in TEI=%u\n", sapi, tei); |
| 571 | msgb_free(msg); |
| 572 | return; |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 573 | } |
| 574 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 575 | /* prepare prim */ |
| 576 | msg->l3h = msg->data; |
| 577 | osmo_prim_init(&dp.oph, 0, PRIM_DL_DATA, PRIM_OP_REQUEST, msg); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 578 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 579 | /* send to L2 */ |
| 580 | lapd_recv_dlsap(&dp, &sap->dl.lctx); |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 581 | }; |
| 582 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 583 | static int send_ph_data_req(struct lapd_msg_ctx *lctx, struct msgb *msg) |
| 584 | { |
| 585 | struct lapd_datalink *dl = lctx->dl; |
| 586 | struct lapd_sap *sap = |
| 587 | container_of(dl, struct lapd_sap, dl); |
| 588 | struct lapd_instance *li = sap->tei->li; |
| 589 | int format = lctx->format; |
| 590 | int addr_len; |
| 591 | |
| 592 | /* control field */ |
| 593 | switch (format) { |
| 594 | case LAPD_FORM_I: |
| 595 | msg->l2h = msgb_push(msg, 2); |
| 596 | msg->l2h[0] = LAPD_CTRL_I4(lctx->n_send); |
| 597 | msg->l2h[1] = LAPD_CTRL_I5(lctx->n_recv, lctx->p_f); |
| 598 | break; |
| 599 | case LAPD_FORM_S: |
| 600 | msg->l2h = msgb_push(msg, 2); |
| 601 | msg->l2h[0] = LAPD_CTRL_S4(lctx->s_u); |
| 602 | msg->l2h[1] = LAPD_CTRL_S5(lctx->n_recv, lctx->p_f); |
| 603 | break; |
| 604 | case LAPD_FORM_U: |
| 605 | msg->l2h = msgb_push(msg, 1); |
| 606 | msg->l2h[0] = LAPD_CTRL_U4(lctx->s_u, lctx->p_f); |
| 607 | break; |
| 608 | default: |
| 609 | msgb_free(msg); |
| 610 | return -EINVAL; |
| 611 | } |
| 612 | /* address field */ |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 613 | if (li->profile.short_address && lctx->tei == 0) |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 614 | addr_len = 1; |
| 615 | else |
| 616 | addr_len = 2; |
| 617 | msg->l2h = msgb_push(msg, addr_len); |
| 618 | msg->l2h[0] = LAPD_ADDR2(lctx->sapi, lctx->cr); |
| 619 | if (addr_len == 1) |
| 620 | msg->l2h[0] |= 0x1; |
| 621 | else |
| 622 | msg->l2h[1] = LAPD_ADDR3(lctx->tei); |
| 623 | |
Pablo Neira Ayuso | 9530600 | 2012-08-22 16:43:59 +0200 | [diff] [blame] | 624 | /* write to PCAP file, if enabled. */ |
| 625 | osmo_pcap_lapd_write(li->pcap_fd, OSMO_LAPD_PCAP_OUTPUT, msg); |
| 626 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 627 | /* forward frame to L1 */ |
| 628 | LOGP(DLLAPD, LOGL_DEBUG, "TX: %s\n", osmo_hexdump(msg->data, msg->len)); |
| 629 | li->transmit_cb(msg, li->transmit_cbdata); |
| 630 | |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | /* A DL-SAP message is received from datalink instance and forwarded to L3 */ |
| 635 | static int send_dlsap(struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx) |
| 636 | { |
| 637 | struct lapd_datalink *dl = lctx->dl; |
| 638 | struct lapd_sap *sap = |
| 639 | container_of(dl, struct lapd_sap, dl); |
| 640 | struct lapd_instance *li; |
| 641 | uint8_t tei, sapi; |
| 642 | char *op = (dp->oph.operation == PRIM_OP_INDICATION) ? "indication" |
| 643 | : "confirm"; |
| 644 | |
| 645 | li = sap->tei->li; |
| 646 | tei = lctx->tei; |
| 647 | sapi = lctx->sapi; |
| 648 | |
| 649 | switch (dp->oph.primitive) { |
| 650 | case PRIM_DL_EST: |
| 651 | LOGP(DLLAPD, LOGL_NOTICE, "LAPD DL-ESTABLISH %s TEI=%d " |
| 652 | "SAPI=%d\n", op, lctx->tei, lctx->sapi); |
| 653 | break; |
| 654 | case PRIM_DL_REL: |
| 655 | LOGP(DLLAPD, LOGL_NOTICE, "LAPD DL-RELEASE %s TEI=%d " |
| 656 | "SAPI=%d\n", op, lctx->tei, lctx->sapi); |
| 657 | lapd_sap_free(sap); |
| 658 | /* note: sap and dl is now gone, don't use it anymore */ |
| 659 | break; |
| 660 | default: |
| 661 | ; |
| 662 | } |
| 663 | |
| 664 | li->receive_cb(dp, tei, sapi, li->receive_cbdata); |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 669 | /* Allocate a new LAPD instance */ |
| 670 | struct lapd_instance *lapd_instance_alloc(int network_side, |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 671 | void (*tx_cb)(struct msgb *msg, void *cbdata), void *tx_cbdata, |
| 672 | void (*rx_cb)(struct osmo_dlsap_prim *odp, uint8_t tei, uint8_t sapi, |
| 673 | void *rx_cbdata), void *rx_cbdata, |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 674 | const struct lapd_profile *profile) |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 675 | { |
| 676 | struct lapd_instance *li; |
| 677 | |
| 678 | li = talloc_zero(NULL, struct lapd_instance); |
| 679 | if (!li) |
| 680 | return NULL; |
| 681 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 682 | li->network_side = network_side; |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 683 | li->transmit_cb = tx_cb; |
| 684 | li->transmit_cbdata = tx_cbdata; |
| 685 | li->receive_cb = rx_cb; |
| 686 | li->receive_cbdata = rx_cbdata; |
Pablo Neira Ayuso | 9530600 | 2012-08-22 16:43:59 +0200 | [diff] [blame] | 687 | li->pcap_fd = -1; |
Andreas Eversberg | 3744b87 | 2011-09-27 12:12:36 +0200 | [diff] [blame] | 688 | memcpy(&li->profile, profile, sizeof(li->profile)); |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 689 | |
Pablo Neira Ayuso | 0ba77d5 | 2011-06-05 18:32:44 +0200 | [diff] [blame] | 690 | INIT_LLIST_HEAD(&li->tei_list); |
| 691 | |
| 692 | return li; |
| 693 | } |
Harald Welte | 14078ea | 2011-08-24 09:45:11 +0200 | [diff] [blame] | 694 | |
Philipp | 0c7d5f4 | 2016-10-19 18:38:58 +0200 | [diff] [blame] | 695 | /* Change lapd-profile on the fly (use with caution!) */ |
| 696 | void lapd_instance_set_profile(struct lapd_instance *li, |
| 697 | const struct lapd_profile *profile) |
| 698 | { |
| 699 | memcpy(&li->profile, profile, sizeof(li->profile)); |
| 700 | } |
| 701 | |
Harald Welte | 14078ea | 2011-08-24 09:45:11 +0200 | [diff] [blame] | 702 | void lapd_instance_free(struct lapd_instance *li) |
| 703 | { |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 704 | struct lapd_tei *teip, *teip2; |
Harald Welte | f350e25 | 2011-08-26 07:55:26 +0200 | [diff] [blame] | 705 | |
Andreas Eversberg | a7ff001 | 2011-09-26 11:29:30 +0200 | [diff] [blame] | 706 | /* Free all TEI instances */ |
| 707 | llist_for_each_entry_safe(teip, teip2, &li->tei_list, list) { |
| 708 | lapd_tei_free(teip); |
Harald Welte | f350e25 | 2011-08-26 07:55:26 +0200 | [diff] [blame] | 709 | } |
| 710 | |
Harald Welte | 14078ea | 2011-08-24 09:45:11 +0200 | [diff] [blame] | 711 | talloc_free(li); |
| 712 | } |