Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 1 | /* Implementation of the C7 UDP link */ |
| 2 | /* |
| 3 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 4 | * (C) 2010 by On-Waves |
| 5 | * All Rights Reserved |
| 6 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 7 | * This program is free software: you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 15 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 16 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <bsc_data.h> |
| 23 | #include <udp_input.h> |
| 24 | #include <mtp_data.h> |
| 25 | #include <mtp_pcap.h> |
| 26 | #include <snmp_mtp.h> |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 27 | #include <cellmgr_debug.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 28 | |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 29 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 30 | |
| 31 | #include <sys/socket.h> |
| 32 | #include <netinet/in.h> |
| 33 | #include <arpa/inet.h> |
| 34 | |
| 35 | #include <string.h> |
| 36 | #include <unistd.h> |
| 37 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 38 | static struct mtp_udp_link *find_link(struct mtp_udp_data *data, uint16_t link_index) |
| 39 | { |
| 40 | struct mtp_udp_link *lnk; |
| 41 | |
| 42 | llist_for_each_entry(lnk, &data->links, entry) |
| 43 | if (lnk->link_index == link_index) |
| 44 | return lnk; |
| 45 | |
| 46 | return NULL; |
| 47 | } |
| 48 | |
| 49 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 50 | static int udp_write_cb(struct bsc_fd *fd, struct msgb *msg) |
| 51 | { |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 52 | struct mtp_udp_data *data; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 53 | struct mtp_udp_link *link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 54 | int rc; |
| 55 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 56 | data = fd->data; |
| 57 | link = find_link(data, msg->cb[0]); |
| 58 | if (!link) { |
| 59 | LOGP(DINP, LOGL_ERROR, "Failed to find link with %lu\n", msg->cb[0]); |
| 60 | return -1; |
| 61 | } |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 62 | |
| 63 | LOGP(DINP, LOGL_DEBUG, "Sending MSU: %s\n", hexdump(msg->data, msg->len)); |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 64 | if (link->base.pcap_fd >= 0) |
| 65 | mtp_pcap_write_msu(link->base.pcap_fd, msg->l2h, msgb_l2len(msg)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 66 | |
| 67 | /* the assumption is we have connected the socket to the remote */ |
| 68 | rc = sendto(fd->fd, msg->data, msg->len, 0, |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 69 | (struct sockaddr *) &link->remote, sizeof(link->remote)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 70 | if (rc != msg->len) { |
| 71 | LOGP(DINP, LOGL_ERROR, "Failed to write msg to socket: %d\n", rc); |
| 72 | return -1; |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static int udp_read_cb(struct bsc_fd *fd) |
| 79 | { |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 80 | struct mtp_udp_data *data; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 81 | struct mtp_link *link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 82 | struct udp_data_hdr *hdr; |
| 83 | struct msgb *msg; |
| 84 | int rc; |
| 85 | unsigned int length; |
| 86 | |
| 87 | msg = msgb_alloc_headroom(4096, 128, "UDP datagram"); |
| 88 | if (!msg) { |
| 89 | LOGP(DINP, LOGL_ERROR, "Failed to allocate memory.\n"); |
| 90 | return -1; |
| 91 | } |
| 92 | |
| 93 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 94 | data = (struct mtp_udp_data *) fd->data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 95 | rc = read(fd->fd, msg->data, 2096); |
| 96 | if (rc < sizeof(*hdr)) { |
| 97 | LOGP(DINP, LOGL_ERROR, "Failed to read at least size of the header: %d\n", rc); |
| 98 | rc = -1; |
| 99 | goto exit; |
| 100 | } |
| 101 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 102 | hdr = (struct udp_data_hdr *) msgb_put(msg, sizeof(*hdr)); |
| 103 | link = (struct mtp_link *) find_link(data, ntohs(hdr->data_link_index)); |
| 104 | |
| 105 | if (!link) { |
| 106 | LOGP(DINP, LOGL_ERROR, "No link registered for %d\n", |
| 107 | ntohs(hdr->data_link_index)); |
| 108 | goto exit; |
| 109 | } |
| 110 | |
| 111 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 112 | /* throw away data as the link is down */ |
Holger Hans Peter Freyther | 2d845fc | 2011-01-20 15:42:13 +0100 | [diff] [blame] | 113 | if (link->set->available == 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 114 | LOGP(DINP, LOGL_ERROR, "The link is down. Not forwarding.\n"); |
| 115 | rc = 0; |
| 116 | goto exit; |
| 117 | } |
| 118 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 119 | if (hdr->data_type == UDP_DATA_RETR_COMPL || hdr->data_type == UDP_DATA_RETR_IMPOS) { |
| 120 | LOGP(DINP, LOGL_ERROR, "Link retrieval done. Restarting the link.\n"); |
Holger Hans Peter Freyther | fa8cf2d | 2011-01-20 16:51:34 +0100 | [diff] [blame] | 121 | mtp_link_failure(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 122 | goto exit; |
| 123 | } else if (hdr->data_type > UDP_DATA_MSU_PRIO_3) { |
| 124 | LOGP(DINP, LOGL_ERROR, "Link failure. retrieved message.\n"); |
Holger Hans Peter Freyther | fa8cf2d | 2011-01-20 16:51:34 +0100 | [diff] [blame] | 125 | mtp_link_failure(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 126 | goto exit; |
| 127 | } |
| 128 | |
| 129 | length = ntohl(hdr->data_length); |
| 130 | if (length + sizeof(*hdr) > (unsigned int) rc) { |
| 131 | LOGP(DINP, LOGL_ERROR, "The MSU payload does not fit: %u + %u > %d \n", |
| 132 | length, sizeof(*hdr), rc); |
| 133 | rc = -1; |
| 134 | goto exit; |
| 135 | } |
| 136 | |
| 137 | msg->l2h = msgb_put(msg, length); |
| 138 | |
| 139 | LOGP(DINP, LOGL_DEBUG, "MSU data on: %p data %s.\n", link, hexdump(msg->data, msg->len)); |
| 140 | if (link->pcap_fd >= 0) |
| 141 | mtp_pcap_write_msu(link->pcap_fd, msg->l2h, msgb_l2len(msg)); |
Holger Hans Peter Freyther | bee2ed1 | 2011-01-18 13:29:42 +0100 | [diff] [blame] | 142 | mtp_link_set_data(link, msg); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 143 | |
| 144 | exit: |
| 145 | msgb_free(msg); |
| 146 | return rc; |
| 147 | } |
| 148 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 149 | static int udp_link_dummy(struct mtp_link *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 150 | { |
| 151 | /* nothing todo */ |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static void do_start(void *_data) |
| 156 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 157 | struct mtp_udp_link *link = (struct mtp_udp_link *) _data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 158 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 159 | snmp_mtp_activate(link->data->session, link->link_index); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 160 | } |
| 161 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 162 | static int udp_link_reset(struct mtp_link *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 163 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 164 | struct mtp_udp_link *ulnk; |
| 165 | |
| 166 | ulnk = (struct mtp_udp_link *) link; |
| 167 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 168 | snmp_mtp_deactivate(ulnk->data->session, ulnk->link_index); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 169 | return 0; |
| 170 | } |
| 171 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 172 | static int udp_link_write(struct mtp_link *link, struct msgb *msg) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 173 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 174 | struct mtp_udp_link *ulnk; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 175 | struct udp_data_hdr *hdr; |
| 176 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 177 | ulnk = (struct mtp_udp_link *) link; |
| 178 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 179 | hdr = (struct udp_data_hdr *) msgb_push(msg, sizeof(*hdr)); |
| 180 | hdr->format_type = UDP_FORMAT_SIMPLE_UDP; |
| 181 | hdr->data_type = UDP_DATA_MSU_PRIO_0; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 182 | hdr->data_link_index = htons(ulnk->link_index); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 183 | hdr->user_context = 0; |
| 184 | hdr->data_length = htonl(msgb_l2len(msg)); |
| 185 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 186 | msg->cb[0] = ulnk->link_index; |
| 187 | |
| 188 | if (write_queue_enqueue(&ulnk->data->write_queue, msg) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 189 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue msg.\n"); |
| 190 | msgb_free(msg); |
| 191 | return -1; |
| 192 | } |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 197 | static int udp_link_start(struct mtp_link *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 198 | { |
| 199 | LOGP(DINP, LOGL_NOTICE, "UDP input is ready.\n"); |
| 200 | do_start(link); |
| 201 | return 0; |
| 202 | } |
| 203 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 204 | int link_udp_init(struct mtp_udp_link *link, const char *remote, int port) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 205 | { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 206 | /* function table */ |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 207 | link->base.shutdown = udp_link_dummy; |
| 208 | link->base.clear_queue = udp_link_dummy; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 209 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 210 | link->base.reset = udp_link_reset; |
| 211 | link->base.start = udp_link_start; |
| 212 | link->base.write = udp_link_write; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 213 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 214 | /* prepare the remote */ |
| 215 | memset(&link->remote, 0, sizeof(link->remote)); |
| 216 | link->remote.sin_family = AF_INET; |
| 217 | link->remote.sin_port = htons(port); |
| 218 | inet_aton(remote, &link->remote.sin_addr); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 219 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 220 | /* add it to the list of udp connections */ |
| 221 | llist_add(&link->entry, &link->data->links); |
| 222 | return 0; |
| 223 | } |
| 224 | |
Holger Hans Peter Freyther | 083a30b | 2011-01-21 12:57:12 +0100 | [diff] [blame] | 225 | static void snmp_poll(void *_data) |
| 226 | { |
| 227 | struct mtp_udp_data *data = _data; |
| 228 | snmp_mtp_poll(); |
| 229 | bsc_schedule_timer(&data->snmp_poll, 0, 5000); |
| 230 | } |
| 231 | |
Holger Hans Peter Freyther | eab2096 | 2011-01-21 18:00:36 +0100 | [diff] [blame^] | 232 | int link_global_init(struct mtp_udp_data *data, char *udp_ip, int src_port) |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 233 | { |
| 234 | struct sockaddr_in addr; |
| 235 | int fd; |
| 236 | int on; |
| 237 | |
Holger Hans Peter Freyther | eab2096 | 2011-01-21 18:00:36 +0100 | [diff] [blame^] | 238 | /* setup SNMP first, it is blocking */ |
| 239 | data->session = snmp_mtp_session_create(udp_ip); |
| 240 | if (!data->session) |
| 241 | return -1; |
| 242 | data->session->data = data; |
| 243 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 244 | INIT_LLIST_HEAD(&data->links); |
| 245 | write_queue_init(&data->write_queue, 100); |
| 246 | |
| 247 | /* socket creation */ |
| 248 | data->write_queue.bfd.data = data; |
| 249 | data->write_queue.bfd.when = BSC_FD_READ; |
| 250 | data->write_queue.read_cb = udp_read_cb; |
| 251 | data->write_queue.write_cb = udp_write_cb; |
| 252 | |
| 253 | data->write_queue.bfd.fd = fd = socket(AF_INET, SOCK_DGRAM, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 254 | if (fd < 0) { |
| 255 | LOGP(DINP, LOGL_ERROR, "Failed to create UDP socket.\n"); |
| 256 | return -1; |
| 257 | } |
| 258 | |
| 259 | on = 1; |
| 260 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 261 | |
| 262 | memset(&addr, 0, sizeof(addr)); |
| 263 | addr.sin_family = AF_INET; |
| 264 | addr.sin_port = htons(src_port); |
| 265 | addr.sin_addr.s_addr = INADDR_ANY; |
| 266 | |
| 267 | if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 268 | perror("Failed to bind UDP socket"); |
| 269 | close(fd); |
| 270 | return -1; |
| 271 | } |
| 272 | |
| 273 | /* now connect the socket to the remote */ |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame] | 274 | if (bsc_register_fd(&data->write_queue.bfd) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 275 | LOGP(DINP, LOGL_ERROR, "Failed to register BFD.\n"); |
| 276 | close(fd); |
| 277 | return -1; |
| 278 | } |
| 279 | |
Holger Hans Peter Freyther | 083a30b | 2011-01-21 12:57:12 +0100 | [diff] [blame] | 280 | data->snmp_poll.data = data; |
| 281 | data->snmp_poll.cb = snmp_poll; |
| 282 | snmp_poll(data); |
| 283 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 284 | return 0; |
| 285 | } |
Holger Hans Peter Freyther | eab2096 | 2011-01-21 18:00:36 +0100 | [diff] [blame^] | 286 | |
| 287 | void snmp_mtp_callback(struct snmp_mtp_session *session, |
| 288 | int area, int res, int link_id) |
| 289 | { |
| 290 | struct mtp_udp_data *data; |
| 291 | struct mtp_udp_link *ulink; |
| 292 | struct mtp_link *link; |
| 293 | |
| 294 | data = session->data; |
| 295 | ulink = find_link(data, link_id); |
| 296 | if (!ulink) |
| 297 | return LOGP(DINP, LOGL_ERROR, "Failed to find link %d\n", link_id); |
| 298 | |
| 299 | link = &ulink->base; |
| 300 | |
| 301 | if (res == SNMP_STATUS_TIMEOUT) { |
| 302 | LOGP(DINP, LOGL_ERROR, "Failed to restart link: %d\n", link_id); |
| 303 | udp_link_reset(link); |
| 304 | return; |
| 305 | } |
| 306 | |
| 307 | switch (area) { |
| 308 | case SNMP_LINK_UP: |
| 309 | mtp_link_up(link); |
| 310 | break; |
| 311 | case SNMP_LINK_DOWN: |
| 312 | mtp_link_down(link); |
| 313 | |
| 314 | /* |
| 315 | * restart the link in 90 seconds... |
| 316 | * to force a timeout on the BSC |
| 317 | */ |
| 318 | link->link_activate.cb = do_start; |
| 319 | link->link_activate.data = link; |
| 320 | bsc_schedule_timer(&link->link_activate, ulink->reset_timeout, 0); |
| 321 | LOGP(DINP, LOGL_NOTICE, |
| 322 | "Will restart SLTM transmission in %d seconds.\n", ulink->reset_timeout); |
| 323 | break; |
| 324 | default: |
| 325 | LOGP(DINP, LOGL_ERROR, "Unknown event %d\n", area); |
| 326 | } |
| 327 | } |