Daniel Willmann | 8b3390e | 2008-12-28 00:31:09 +0000 | [diff] [blame] | 1 | /* Point-to-Point (PP) Short Message Service (SMS) |
| 2 | * Support on Mobile Radio Interface |
| 3 | * 3GPP TS 04.11 version 7.1.0 Release 1998 / ETSI TS 100 942 V7.1.0 */ |
| 4 | |
| 5 | /* (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de> |
| 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | #include <errno.h> |
| 30 | #include <netinet/in.h> |
| 31 | |
| 32 | #include <openbsc/msgb.h> |
| 33 | #include <openbsc/debug.h> |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 34 | #include <openbsc/gsm_data.h> |
| 35 | #include <openbsc/gsm_subscriber.h> |
Daniel Willmann | 8b3390e | 2008-12-28 00:31:09 +0000 | [diff] [blame] | 36 | #include <openbsc/gsm_04_11.h> |
| 37 | #include <openbsc/gsm_04_08.h> |
| 38 | #include <openbsc/abis_rsl.h> |
| 39 | |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 40 | #define GSM411_ALLOC_SIZE 1024 |
| 41 | #define GSM411_ALLOC_HEADROOM 128 |
| 42 | |
| 43 | static struct msgb *gsm411_msgb_alloc(void) |
| 44 | { |
| 45 | return msgb_alloc_headroom(GSM411_ALLOC_SIZE, GSM411_ALLOC_HEADROOM); |
| 46 | } |
| 47 | |
| 48 | static int gsm0411_sendmsg(struct msgb *msg) |
| 49 | { |
| 50 | if (msg->lchan) |
| 51 | msg->trx = msg->lchan->ts->trx; |
| 52 | |
| 53 | msg->l3h = msg->data; |
| 54 | |
| 55 | return rsl_data_request(msg, 0); |
| 56 | } |
| 57 | |
Daniel Willmann | e0fbec8 | 2008-12-29 00:44:41 +0000 | [diff] [blame] | 58 | static char *gsm411_7bit_decode(u_int8_t *user_data, u_int8_t length) |
| 59 | { |
| 60 | u_int8_t d_off = 0, b_off = 0; |
| 61 | u_int8_t i; |
| 62 | char *text = malloc(length+1); |
| 63 | |
| 64 | for (i=0;i<length;i++) { |
| 65 | text[i] = ((user_data[d_off] + (user_data[d_off+1]<<8)) & (0x7f<<b_off))>>b_off; |
| 66 | b_off += 7; |
| 67 | if (b_off >= 8) { |
| 68 | d_off += 1; |
| 69 | b_off -= 8; |
| 70 | } |
| 71 | } |
| 72 | text[i] = 0; |
| 73 | return text; |
| 74 | } |
| 75 | |
| 76 | static int gsm411_sms_submit_from_msgb(struct msgb *msg) |
| 77 | { |
| 78 | u_int8_t *smsp = msgb_sms(msg); |
| 79 | struct sms_submit *sms; |
| 80 | |
| 81 | sms = malloc(sizeof(*sms)); |
| 82 | sms->mti = *smsp & 0x03; |
| 83 | sms->mms = !!(*smsp & 0x04); |
| 84 | sms->vpf = (*smsp & 0x18) >> 3; |
| 85 | sms->sri = !!(*smsp & 0x20); |
| 86 | sms->udhi= !!(*smsp & 0x40); |
| 87 | sms->rp = !!(*smsp & 0x80); |
| 88 | |
| 89 | smsp++; |
| 90 | sms->msg_ref = *smsp++; |
| 91 | |
| 92 | /* Skip destination address for now */ |
| 93 | smsp += 2 + *smsp/2 + *smsp%2; |
| 94 | |
| 95 | sms->pid = *smsp++; |
| 96 | sms->dcs = *smsp++; |
| 97 | switch (sms->vpf) |
| 98 | { |
| 99 | case 2: /* relative */ |
| 100 | sms->vp = *smsp++; |
| 101 | break; |
| 102 | default: |
| 103 | DEBUGP(DSMS, "SMS Validity period not implemented: 0x%02x\n", |
| 104 | sms->vpf); |
| 105 | } |
| 106 | sms->ud_len = *smsp++; |
| 107 | |
| 108 | sms->user_data = gsm411_7bit_decode(smsp, sms->ud_len); |
| 109 | |
| 110 | DEBUGP(DSMS, "SMS:\nMTI: 0x%02x, VPF: 0x%02x, MR: 0x%02x\n" |
| 111 | "PID: 0x%02x, DCS: 0x%02x, UserDataLength: 0x%02x\n" |
| 112 | "UserData: \"%s\"\n", sms->mti, sms->vpf, sms->msg_ref, |
| 113 | sms->pid, sms->dcs, sms->ud_len, sms->user_data); |
| 114 | |
| 115 | free(sms); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
Daniel Willmann | 9dfbf25 | 2008-12-29 03:24:29 +0000 | [diff] [blame] | 120 | static int gsm411_send_rp_ack(struct gsm_lchan *lchan, u_int8_t trans_id, |
| 121 | u_int8_t msg_ref) |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 122 | { |
| 123 | struct msgb *msg = gsm411_msgb_alloc(); |
| 124 | struct gsm48_hdr *gh; |
| 125 | struct gsm411_rp_hdr *rp; |
| 126 | |
| 127 | msg->lchan = lchan; |
| 128 | |
| 129 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
Daniel Willmann | aecbbed | 2008-12-29 03:45:50 +0000 | [diff] [blame^] | 130 | // Outgoing needs the highest bit set |
| 131 | gh->proto_discr = GSM48_PDISC_SMS | trans_id<<4 | 0x80; |
| 132 | gh->msg_type = GSM411_MT_CP_DATA; |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 133 | |
| 134 | rp = (struct gsm411_rp_hdr *)msgb_put(msg, sizeof(*rp)); |
Daniel Willmann | aecbbed | 2008-12-29 03:45:50 +0000 | [diff] [blame^] | 135 | rp->len = 2; |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 136 | rp->msg_type = GSM411_MT_RP_ACK_MT; |
| 137 | rp->msg_ref = msg_ref; |
| 138 | |
| 139 | DEBUGP(DSMS, "TX: SMS RP ACK\n"); |
| 140 | |
| 141 | return gsm0411_sendmsg(msg); |
| 142 | } |
| 143 | |
Daniel Willmann | 9dfbf25 | 2008-12-29 03:24:29 +0000 | [diff] [blame] | 144 | static int gsm411_send_rp_error(struct gsm_lchan *lchan, u_int8_t trans_id, |
| 145 | u_int8_t msg_ref) |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 146 | { |
| 147 | struct msgb *msg = gsm411_msgb_alloc(); |
| 148 | struct gsm48_hdr *gh; |
| 149 | struct gsm411_rp_hdr *rp; |
| 150 | |
| 151 | msg->lchan = lchan; |
| 152 | |
| 153 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
Daniel Willmann | aecbbed | 2008-12-29 03:45:50 +0000 | [diff] [blame^] | 154 | // Outgoing needs the highest bit set |
| 155 | gh->proto_discr = GSM48_PDISC_SMS | trans_id<<4 | 0x80; |
| 156 | gh->msg_type = GSM411_MT_CP_DATA; |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 157 | |
| 158 | rp = (struct gsm411_rp_hdr *)msgb_put(msg, sizeof(*rp)); |
| 159 | rp->msg_type = GSM411_MT_RP_ERROR_MT; |
| 160 | rp->msg_ref = msg_ref; |
| 161 | |
| 162 | DEBUGP(DSMS, "TX: SMS RP ERROR\n"); |
| 163 | |
| 164 | return gsm0411_sendmsg(msg); |
| 165 | } |
| 166 | |
Daniel Willmann | 8b3390e | 2008-12-28 00:31:09 +0000 | [diff] [blame] | 167 | static int gsm411_cp_data(struct msgb *msg) |
| 168 | { |
| 169 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 170 | int rc = 0; |
| 171 | |
Daniel Willmann | 471712b | 2008-12-29 01:54:02 +0000 | [diff] [blame] | 172 | struct gsm411_rp_hdr *rp_data = (struct gsm411_rp_hdr*)&gh->data; |
Daniel Willmann | 8b3390e | 2008-12-28 00:31:09 +0000 | [diff] [blame] | 173 | u_int8_t msg_type = rp_data->msg_type & 0x07; |
| 174 | |
| 175 | switch (msg_type) { |
| 176 | case GSM411_MT_RP_DATA_MO: |
Daniel Willmann | e0fbec8 | 2008-12-29 00:44:41 +0000 | [diff] [blame] | 177 | DEBUGP(DSMS, "SMS RP-DATA (MO)\n"); |
| 178 | /* Skip SMSC no and RP-UD length */ |
| 179 | msg->smsh = &rp_data->data[1] + rp_data->data[1] + 2; |
| 180 | gsm411_sms_submit_from_msgb(msg); |
Daniel Willmann | 9dfbf25 | 2008-12-29 03:24:29 +0000 | [diff] [blame] | 181 | gsm411_send_rp_ack(msg->lchan, (gh->proto_discr & 0xf0)>>4, rp_data->msg_ref); |
Daniel Willmann | 8b3390e | 2008-12-28 00:31:09 +0000 | [diff] [blame] | 182 | break; |
| 183 | default: |
| 184 | DEBUGP(DSMS, "Unimplemented RP type 0x%02x\n", msg_type); |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | return rc; |
| 189 | } |
| 190 | |
| 191 | int gsm0411_rcv_sms(struct msgb *msg) |
| 192 | { |
| 193 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 194 | u_int8_t msg_type = gh->msg_type; |
| 195 | int rc = 0; |
| 196 | |
| 197 | DEBUGP(DSMS, "SMS Message\n"); |
| 198 | |
| 199 | switch(msg_type) { |
| 200 | case GSM411_MT_CP_DATA: |
| 201 | DEBUGP(DSMS, "SMS CP-DATA\n"); |
| 202 | rc = gsm411_cp_data(msg); |
| 203 | break; |
| 204 | case GSM411_MT_CP_ACK: |
| 205 | case GSM411_MT_CP_ERROR: |
| 206 | default: |
| 207 | DEBUGP(DSMS, "Unimplemented CP msg_type: 0x%02x\n", msg_type); |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | return rc; |
| 213 | } |
| 214 | |