Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 1 | /* |
Holger Hans Peter Freyther | 1b6901e | 2011-01-17 16:13:28 +0100 | [diff] [blame] | 2 | * (C) 2010-2011 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 3 | * (C) 2010-2011 by On-Waves |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 4 | * All Rights Reserved |
| 5 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 6 | * This program is free software: you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Affero General Public License as published by |
| 8 | * the Free Software Foundation, either version 3 of the License, or |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 14 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 15 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 16 | * You should have received a copy of the GNU Affero General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <isup_types.h> |
| 22 | #include <cellmgr_debug.h> |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 23 | #include <mtp_data.h> |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 24 | |
Harald Welte | ff397ed | 2011-05-08 10:29:23 +0200 | [diff] [blame] | 25 | #include <osmocom/core/msgb.h> |
| 26 | #include <osmocom/gsm/tlv.h> |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 27 | |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 28 | static struct msgb *isup_status_alloc(int cic, int msg_type, uint8_t *extra, int range, int val) |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 29 | { |
| 30 | struct isup_msg_hdr *hdr; |
| 31 | struct msgb *msg; |
| 32 | int bits, len; |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 33 | uint8_t *data; |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 34 | |
Holger Hans Peter Freyther | ecd8355 | 2011-01-19 09:19:17 +0100 | [diff] [blame] | 35 | msg = msgb_alloc_headroom(4096, 128, "ISUP Simple MSG"); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 36 | if (!msg) { |
Holger Hans Peter Freyther | ecd8355 | 2011-01-19 09:19:17 +0100 | [diff] [blame] | 37 | LOGP(DISUP, LOGL_ERROR, "Allocation of status message failed.\n"); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | msg->l2h = msgb_put(msg, sizeof(*hdr)); |
| 42 | |
| 43 | /* write the ISUP header */ |
| 44 | hdr = (struct isup_msg_hdr *) msg->l2h; |
| 45 | hdr->cic = cic; |
Holger Hans Peter Freyther | ecd8355 | 2011-01-19 09:19:17 +0100 | [diff] [blame] | 46 | hdr->msg_type = msg_type; |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 47 | |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 48 | if (extra) |
| 49 | msgb_v_put(msg, *extra); |
| 50 | |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 51 | /* |
| 52 | * place the pointers here. |
| 53 | * 1.) place the variable start after us |
| 54 | * 2.) place the length |
| 55 | */ |
| 56 | msgb_v_put(msg, 1); |
| 57 | |
| 58 | bits = range + 1; |
| 59 | len = (bits / 8) + 1; |
| 60 | msgb_v_put(msg, len + 1); |
| 61 | msgb_v_put(msg, range); |
| 62 | |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 63 | data = msgb_put(msg, len); |
| 64 | |
| 65 | /* set the status bits to val... FIXME this sets the extra bits too */ |
| 66 | memset(data, val, len); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 67 | |
| 68 | return msg; |
| 69 | } |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 70 | |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 71 | static struct msgb *isup_simple_alloc(int cic, int msg_type) |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 72 | { |
| 73 | struct isup_msg_hdr *hdr; |
| 74 | struct msgb *msg; |
| 75 | |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 76 | msg = msgb_alloc_headroom(4096, 128, "ISUP Simple MSG"); |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 77 | if (!msg) { |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 78 | LOGP(DISUP, LOGL_ERROR, "Allocation of Simple message failed.\n"); |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 79 | return NULL; |
| 80 | } |
| 81 | |
| 82 | msg->l2h = msgb_put(msg, sizeof(*hdr)); |
| 83 | |
| 84 | /* write the ISUP header */ |
| 85 | hdr = (struct isup_msg_hdr *) msg->l2h; |
| 86 | hdr->cic = cic; |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 87 | hdr->msg_type = msg_type; |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 88 | |
| 89 | msgb_v_put(msg, 0); |
| 90 | return msg; |
| 91 | } |
| 92 | |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 93 | /* this message contains the range */ |
Holger Hans Peter Freyther | ecd8355 | 2011-01-19 09:19:17 +0100 | [diff] [blame] | 94 | int isup_parse_status(const uint8_t *data, uint8_t in_length) |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 95 | { |
| 96 | uint8_t ptr; |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 97 | |
Holger Hans Peter Freyther | a4661fb | 2011-01-19 09:43:01 +0100 | [diff] [blame] | 98 | if (in_length < 3) { |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 99 | LOGP(DISUP, LOGL_ERROR, "This needs three bytes.\n"); |
| 100 | return -1; |
| 101 | } |
| 102 | |
| 103 | ptr = data[0]; |
| 104 | if (1 + ptr > in_length) { |
| 105 | LOGP(DISUP, LOGL_ERROR, "Pointing outside the packet.\n"); |
| 106 | return -1; |
| 107 | } |
| 108 | |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 109 | if (1 + ptr + 1 > in_length) { |
| 110 | LOGP(DISUP, LOGL_ERROR, "No space for the data.\n"); |
| 111 | return -1; |
| 112 | } |
| 113 | |
| 114 | return data[0 + ptr + 1]; |
| 115 | } |
| 116 | |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 117 | |
| 118 | /* Handle incoming ISUP data */ |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 119 | static int handle_circuit_reset_grs(struct mtp_link_set *set, int sls, int cic, |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 120 | const uint8_t *data, int size) |
| 121 | { |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 122 | struct msgb *resp; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 123 | int range; |
| 124 | |
Holger Hans Peter Freyther | ecd8355 | 2011-01-19 09:19:17 +0100 | [diff] [blame] | 125 | range = isup_parse_status(data, size); |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 126 | if (range < 0) |
| 127 | return -1; |
| 128 | |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 129 | resp = isup_status_alloc(cic, ISUP_MSG_GRA, NULL, range, 0); |
| 130 | if (!resp) |
| 131 | return -1; |
| 132 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 133 | mtp_link_set_submit_isup_data(set, sls, resp->l2h, msgb_l2len(resp)); |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 134 | msgb_free(resp); |
| 135 | return 0; |
| 136 | } |
| 137 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 138 | static int handle_circuit_reset_cgb(struct mtp_link_set *set, int sls, int cic, |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 139 | const uint8_t *data, int size) |
| 140 | { |
| 141 | struct msgb *resp; |
| 142 | int range; |
| 143 | uint8_t val; |
| 144 | |
| 145 | if (size < 1) |
| 146 | return -1; |
| 147 | |
| 148 | range = isup_parse_status(data + 1, size - 1); |
| 149 | if (range < 0) |
| 150 | return -1; |
| 151 | |
| 152 | val = 0; |
| 153 | resp = isup_status_alloc(cic, ISUP_MSG_CGBA, &val, range, 0xff); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 154 | if (!resp) |
| 155 | return -1; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 156 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 157 | mtp_link_set_submit_isup_data(set, sls, resp->l2h, msgb_l2len(resp)); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 158 | msgb_free(resp); |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 159 | return 0; |
| 160 | } |
| 161 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 162 | static int send_cgu(struct mtp_link_set *set, int sls, int cic, int range) |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 163 | { |
| 164 | struct msgb *resp; |
| 165 | uint8_t val; |
| 166 | |
| 167 | val = 0; |
| 168 | resp = isup_status_alloc(cic, ISUP_MSG_CGU, &val, range, 0); |
| 169 | if (!resp) |
| 170 | return -1; |
| 171 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 172 | mtp_link_set_submit_isup_data(set, sls, resp->l2h, msgb_l2len(resp)); |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 173 | msgb_free(resp); |
| 174 | return 0; |
| 175 | } |
| 176 | |
Holger Hans Peter Freyther | e0dc3e5 | 2011-03-05 09:50:47 +0100 | [diff] [blame] | 177 | static int handle_cgu(struct mtp_link_set *set, int sls, int cic, |
| 178 | uint8_t *data, uint16_t size) |
| 179 | { |
| 180 | uint8_t *out; |
| 181 | struct isup_msg_hdr *hdr; |
| 182 | struct msgb *resp; |
| 183 | |
| 184 | resp = msgb_alloc_headroom(4096, 128, "ISUP CGUA MSG"); |
| 185 | if (!resp) { |
| 186 | LOGP(DISUP, LOGL_ERROR, "Allocation of CGUA message failed.\n"); |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | resp->l2h = msgb_put(resp, sizeof(*hdr)); |
| 191 | |
| 192 | /* write the ISUP header */ |
| 193 | hdr = (struct isup_msg_hdr *) resp->l2h; |
| 194 | hdr->cic = cic; |
| 195 | hdr->msg_type = ISUP_MSG_CGUA; |
| 196 | |
| 197 | out = msgb_put(resp, size); |
| 198 | memcpy(out, data, size); |
| 199 | |
| 200 | mtp_link_set_submit_isup_data(set, sls, resp->l2h, msgb_l2len(resp)); |
| 201 | msgb_free(resp); |
| 202 | return 0; |
| 203 | } |
| 204 | |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 205 | static int handle_simple_resp(struct mtp_link_set *set, int sls, int cic, int msg_type) |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 206 | { |
| 207 | struct msgb *resp; |
| 208 | |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 209 | resp = isup_simple_alloc(cic, msg_type); |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 210 | if (!resp) |
| 211 | return -1; |
| 212 | mtp_link_set_submit_isup_data(set, sls, resp->l2h, msgb_l2len(resp)); |
| 213 | msgb_free(resp); |
| 214 | return 0; |
| 215 | } |
| 216 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 217 | int mtp_link_set_isup(struct mtp_link_set *set, struct msgb *msg, int sls) |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 218 | { |
| 219 | int rc = -1; |
| 220 | int payload_size; |
| 221 | struct isup_msg_hdr *hdr; |
| 222 | |
| 223 | if (msgb_l3len(msg) < sizeof(*hdr)) { |
| 224 | LOGP(DISUP, LOGL_ERROR, "ISUP header is too short.\n"); |
| 225 | return -1; |
| 226 | } |
| 227 | |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 228 | if (set->pass_all_isup) { |
| 229 | mtp_link_set_forward_isup(set, msg, sls); |
Holger Hans Peter Freyther | efbd8c2 | 2011-01-17 20:21:45 +0100 | [diff] [blame] | 230 | return 0; |
| 231 | } |
| 232 | |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 233 | hdr = (struct isup_msg_hdr *) msg->l3h; |
| 234 | payload_size = msgb_l3len(msg) - sizeof(*hdr); |
| 235 | |
| 236 | switch (hdr->msg_type) { |
| 237 | case ISUP_MSG_GRS: |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 238 | rc = handle_circuit_reset_grs(set, sls, hdr->cic, hdr->data, payload_size); |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 239 | break; |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 240 | case ISUP_MSG_CGB: |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 241 | rc = handle_circuit_reset_cgb(set, sls, hdr->cic, hdr->data, payload_size); |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 242 | if (rc == 0) |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 243 | rc = send_cgu(set, sls, hdr->cic, 28); |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 244 | break; |
Holger Hans Peter Freyther | e0dc3e5 | 2011-03-05 09:50:47 +0100 | [diff] [blame] | 245 | case ISUP_MSG_CGU: |
| 246 | rc = handle_cgu(set, sls, hdr->cic, hdr->data, payload_size); |
| 247 | break; |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame] | 248 | case ISUP_MSG_CGUA: |
Holger Hans Peter Freyther | 8941c1d | 2011-03-03 08:18:27 +0100 | [diff] [blame] | 249 | LOGP(DISUP, LOGL_NOTICE, "CIC %d is now unblocked on linkset %d/%s.\n", |
| 250 | hdr->cic, set->nr, set->name); |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 251 | break; |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 252 | case ISUP_MSG_RSC: |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 253 | rc = handle_simple_resp(set, sls, hdr->cic, ISUP_MSG_RLC); |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 254 | break; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 255 | default: |
Holger Hans Peter Freyther | d062f83 | 2011-02-23 16:58:15 +0100 | [diff] [blame] | 256 | mtp_link_set_forward_isup(set, msg, sls); |
Holger Hans Peter Freyther | 1b6901e | 2011-01-17 16:13:28 +0100 | [diff] [blame] | 257 | rc = 0; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 258 | break; |
| 259 | } |
| 260 | |
| 261 | return rc; |
| 262 | } |