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 | |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 25 | #include <osmocore/msgb.h> |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 26 | #include <osmocore/tlv.h> |
| 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; |
| 97 | uint8_t length; |
| 98 | |
Holger Hans Peter Freyther | a4661fb | 2011-01-19 09:43:01 +0100 | [diff] [blame] | 99 | if (in_length < 3) { |
Holger Hans Peter Freyther | c21cfaa | 2010-12-10 03:53:28 +0100 | [diff] [blame] | 100 | LOGP(DISUP, LOGL_ERROR, "This needs three bytes.\n"); |
| 101 | return -1; |
| 102 | } |
| 103 | |
| 104 | ptr = data[0]; |
| 105 | if (1 + ptr > in_length) { |
| 106 | LOGP(DISUP, LOGL_ERROR, "Pointing outside the packet.\n"); |
| 107 | return -1; |
| 108 | } |
| 109 | |
| 110 | length = data[0 + ptr]; |
| 111 | |
| 112 | if (1 + ptr + 1 > in_length) { |
| 113 | LOGP(DISUP, LOGL_ERROR, "No space for the data.\n"); |
| 114 | return -1; |
| 115 | } |
| 116 | |
| 117 | return data[0 + ptr + 1]; |
| 118 | } |
| 119 | |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 120 | |
| 121 | /* Handle incoming ISUP data */ |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 122 | static int handle_circuit_reset_grs(struct mtp_link_set *link, int sls, int cic, |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 123 | const uint8_t *data, int size) |
| 124 | { |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 125 | struct msgb *resp; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 126 | int range; |
| 127 | |
Holger Hans Peter Freyther | ecd8355 | 2011-01-19 09:19:17 +0100 | [diff] [blame] | 128 | range = isup_parse_status(data, size); |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 129 | if (range < 0) |
| 130 | return -1; |
| 131 | |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 132 | resp = isup_status_alloc(cic, ISUP_MSG_GRA, NULL, range, 0); |
| 133 | if (!resp) |
| 134 | return -1; |
| 135 | |
| 136 | mtp_link_set_submit_isup_data(link, sls, resp->l2h, msgb_l2len(resp)); |
| 137 | msgb_free(resp); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int handle_circuit_reset_cgb(struct mtp_link_set *link, int sls, int cic, |
| 142 | const uint8_t *data, int size) |
| 143 | { |
| 144 | struct msgb *resp; |
| 145 | int range; |
| 146 | uint8_t val; |
| 147 | |
| 148 | if (size < 1) |
| 149 | return -1; |
| 150 | |
| 151 | range = isup_parse_status(data + 1, size - 1); |
| 152 | if (range < 0) |
| 153 | return -1; |
| 154 | |
| 155 | val = 0; |
| 156 | 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] | 157 | if (!resp) |
| 158 | return -1; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 159 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 160 | mtp_link_set_submit_isup_data(link, sls, resp->l2h, msgb_l2len(resp)); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 161 | msgb_free(resp); |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 162 | return 0; |
| 163 | } |
| 164 | |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame^] | 165 | static int send_cgu(struct mtp_link_set *link, int sls, int cic, int range) |
| 166 | { |
| 167 | struct msgb *resp; |
| 168 | uint8_t val; |
| 169 | |
| 170 | val = 0; |
| 171 | resp = isup_status_alloc(cic, ISUP_MSG_CGU, &val, range, 0); |
| 172 | if (!resp) |
| 173 | return -1; |
| 174 | |
| 175 | mtp_link_set_submit_isup_data(link, sls, resp->l2h, msgb_l2len(resp)); |
| 176 | msgb_free(resp); |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | 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] | 181 | { |
| 182 | struct msgb *resp; |
| 183 | |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame^] | 184 | resp = isup_simple_alloc(cic, msg_type); |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 185 | if (!resp) |
| 186 | return -1; |
| 187 | mtp_link_set_submit_isup_data(set, sls, resp->l2h, msgb_l2len(resp)); |
| 188 | msgb_free(resp); |
| 189 | return 0; |
| 190 | } |
| 191 | |
Holger Hans Peter Freyther | 1b6901e | 2011-01-17 16:13:28 +0100 | [diff] [blame] | 192 | int mtp_link_set_isup(struct mtp_link_set *link, struct msgb *msg, int sls) |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 193 | { |
| 194 | int rc = -1; |
| 195 | int payload_size; |
| 196 | struct isup_msg_hdr *hdr; |
| 197 | |
| 198 | if (msgb_l3len(msg) < sizeof(*hdr)) { |
| 199 | LOGP(DISUP, LOGL_ERROR, "ISUP header is too short.\n"); |
| 200 | return -1; |
| 201 | } |
| 202 | |
Holger Hans Peter Freyther | efbd8c2 | 2011-01-17 20:21:45 +0100 | [diff] [blame] | 203 | if (link->pass_all_isup) { |
| 204 | mtp_link_set_forward_isup(link, msg, sls); |
| 205 | return 0; |
| 206 | } |
| 207 | |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 208 | hdr = (struct isup_msg_hdr *) msg->l3h; |
| 209 | payload_size = msgb_l3len(msg) - sizeof(*hdr); |
| 210 | |
| 211 | switch (hdr->msg_type) { |
| 212 | case ISUP_MSG_GRS: |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 213 | rc = handle_circuit_reset_grs(link, sls, hdr->cic, hdr->data, payload_size); |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 214 | break; |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 215 | case ISUP_MSG_CGB: |
| 216 | rc = handle_circuit_reset_cgb(link, sls, hdr->cic, hdr->data, payload_size); |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame^] | 217 | if (rc == 0) |
| 218 | rc = send_cgu(link, sls, hdr->cic, 28); |
| 219 | break; |
| 220 | case ISUP_MSG_CGUA: |
| 221 | LOGP(DISUP, LOGL_NOTICE, "CIC %d is now unblocked.\n", hdr->cic); |
Holger Hans Peter Freyther | 8f6eb5e | 2011-01-19 09:27:41 +0100 | [diff] [blame] | 222 | break; |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 223 | case ISUP_MSG_RSC: |
Holger Hans Peter Freyther | 69e71e0 | 2011-01-19 09:33:00 +0100 | [diff] [blame^] | 224 | rc = handle_simple_resp(link, sls, hdr->cic, ISUP_MSG_RLC); |
Holger Hans Peter Freyther | 6e11bee | 2011-01-18 23:34:19 +0100 | [diff] [blame] | 225 | break; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 226 | default: |
Holger Hans Peter Freyther | 1b6901e | 2011-01-17 16:13:28 +0100 | [diff] [blame] | 227 | mtp_link_set_forward_isup(link, msg, sls); |
| 228 | rc = 0; |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 229 | break; |
| 230 | } |
| 231 | |
| 232 | return rc; |
| 233 | } |