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 | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 160 | mtp_link_up(&link->base); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 161 | } |
| 162 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 163 | static int udp_link_reset(struct mtp_link *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 164 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 165 | struct mtp_udp_link *ulnk; |
| 166 | |
| 167 | ulnk = (struct mtp_udp_link *) link; |
| 168 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 169 | LOGP(DINP, LOGL_NOTICE, "Will restart SLTM transmission in %d seconds.\n", |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 170 | ulnk->reset_timeout); |
| 171 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame^] | 172 | snmp_mtp_deactivate(ulnk->data->session, ulnk->link_index); |
Holger Hans Peter Freyther | c840569 | 2011-01-02 20:24:08 +0100 | [diff] [blame] | 173 | mtp_link_down(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 174 | |
| 175 | /* restart the link in 90 seconds... to force a timeout on the BSC */ |
| 176 | link->link_activate.cb = do_start; |
| 177 | link->link_activate.data = link; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 178 | bsc_schedule_timer(&link->link_activate, ulnk->reset_timeout, 0); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 179 | return 0; |
| 180 | } |
| 181 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 182 | 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] | 183 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 184 | struct mtp_udp_link *ulnk; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 185 | struct udp_data_hdr *hdr; |
| 186 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 187 | ulnk = (struct mtp_udp_link *) link; |
| 188 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 189 | hdr = (struct udp_data_hdr *) msgb_push(msg, sizeof(*hdr)); |
| 190 | hdr->format_type = UDP_FORMAT_SIMPLE_UDP; |
| 191 | hdr->data_type = UDP_DATA_MSU_PRIO_0; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 192 | hdr->data_link_index = htons(ulnk->link_index); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 193 | hdr->user_context = 0; |
| 194 | hdr->data_length = htonl(msgb_l2len(msg)); |
| 195 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame^] | 196 | msg->cb[0] = ulnk->link_index; |
| 197 | |
| 198 | if (write_queue_enqueue(&ulnk->data->write_queue, msg) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 199 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue msg.\n"); |
| 200 | msgb_free(msg); |
| 201 | return -1; |
| 202 | } |
| 203 | |
| 204 | return 0; |
| 205 | } |
| 206 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 207 | static int udp_link_start(struct mtp_link *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 208 | { |
| 209 | LOGP(DINP, LOGL_NOTICE, "UDP input is ready.\n"); |
| 210 | do_start(link); |
| 211 | return 0; |
| 212 | } |
| 213 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame^] | 214 | 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] | 215 | { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 216 | /* function table */ |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 217 | link->base.shutdown = udp_link_dummy; |
| 218 | link->base.clear_queue = udp_link_dummy; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 219 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 220 | link->base.reset = udp_link_reset; |
| 221 | link->base.start = udp_link_start; |
| 222 | link->base.write = udp_link_write; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 223 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame^] | 224 | /* prepare the remote */ |
| 225 | memset(&link->remote, 0, sizeof(link->remote)); |
| 226 | link->remote.sin_family = AF_INET; |
| 227 | link->remote.sin_port = htons(port); |
| 228 | inet_aton(remote, &link->remote.sin_addr); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 229 | |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame^] | 230 | /* add it to the list of udp connections */ |
| 231 | llist_add(&link->entry, &link->data->links); |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | int link_global_init(struct mtp_udp_data *data, int src_port) |
| 236 | { |
| 237 | struct sockaddr_in addr; |
| 238 | int fd; |
| 239 | int on; |
| 240 | |
| 241 | INIT_LLIST_HEAD(&data->links); |
| 242 | write_queue_init(&data->write_queue, 100); |
| 243 | |
| 244 | /* socket creation */ |
| 245 | data->write_queue.bfd.data = data; |
| 246 | data->write_queue.bfd.when = BSC_FD_READ; |
| 247 | data->write_queue.read_cb = udp_read_cb; |
| 248 | data->write_queue.write_cb = udp_write_cb; |
| 249 | |
| 250 | 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] | 251 | if (fd < 0) { |
| 252 | LOGP(DINP, LOGL_ERROR, "Failed to create UDP socket.\n"); |
| 253 | return -1; |
| 254 | } |
| 255 | |
| 256 | on = 1; |
| 257 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 258 | |
| 259 | memset(&addr, 0, sizeof(addr)); |
| 260 | addr.sin_family = AF_INET; |
| 261 | addr.sin_port = htons(src_port); |
| 262 | addr.sin_addr.s_addr = INADDR_ANY; |
| 263 | |
| 264 | if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 265 | perror("Failed to bind UDP socket"); |
| 266 | close(fd); |
| 267 | return -1; |
| 268 | } |
| 269 | |
| 270 | /* now connect the socket to the remote */ |
Holger Hans Peter Freyther | f38114e | 2011-01-20 21:11:13 +0100 | [diff] [blame^] | 271 | if (bsc_register_fd(&data->write_queue.bfd) != 0) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 272 | LOGP(DINP, LOGL_ERROR, "Failed to register BFD.\n"); |
| 273 | close(fd); |
| 274 | return -1; |
| 275 | } |
| 276 | |
| 277 | return 0; |
| 278 | } |