Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 1 | /* Routines to talk to the MSC using the IPA Protocol */ |
| 2 | /* |
| 3 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
Holger Hans Peter Freyther | df6143a | 2010-06-15 18:46:56 +0800 | [diff] [blame] | 4 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 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 |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <openbsc/bsc_msc.h> |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 24 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | f76e7ef | 2010-06-15 18:52:05 +0800 | [diff] [blame] | 25 | #include <openbsc/ipaccess.h> |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 26 | |
| 27 | #include <osmocore/write_queue.h> |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 28 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 29 | |
| 30 | #include <arpa/inet.h> |
| 31 | #include <sys/socket.h> |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 32 | #include <errno.h> |
| 33 | #include <fcntl.h> |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 34 | #include <stdio.h> |
| 35 | #include <string.h> |
| 36 | #include <unistd.h> |
| 37 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 38 | static void connection_loss(struct bsc_msc_connection *con) |
| 39 | { |
| 40 | struct bsc_fd *fd; |
| 41 | |
| 42 | fd = &con->write_queue.bfd; |
| 43 | |
| 44 | close(fd->fd); |
| 45 | fd->fd = -1; |
| 46 | fd->cb = write_queue_bfd_cb; |
| 47 | fd->when = 0; |
| 48 | |
| 49 | con->is_connected = 0; |
Holger Hans Peter Freyther | bec411b | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 50 | con->first_contact = 0; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 51 | con->connection_loss(con); |
| 52 | } |
| 53 | |
Holger Hans Peter Freyther | e47a91b | 2010-05-05 22:48:56 +0800 | [diff] [blame] | 54 | static void msc_con_timeout(void *_con) |
| 55 | { |
| 56 | struct bsc_msc_connection *con = _con; |
| 57 | |
| 58 | LOGP(DMSC, LOGL_ERROR, "MSC Connection timeout.\n"); |
| 59 | bsc_msc_lost(con); |
| 60 | } |
| 61 | |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 62 | static int bsc_msc_except(struct bsc_fd *bfd) |
| 63 | { |
| 64 | struct write_queue *wrt; |
| 65 | struct bsc_msc_connection *con; |
| 66 | |
| 67 | LOGP(DMSC, LOGL_ERROR, "Exception on the BFD. Closing down.\n"); |
| 68 | |
| 69 | wrt = container_of(bfd, struct write_queue, bfd); |
| 70 | con = container_of(wrt, struct bsc_msc_connection, write_queue); |
| 71 | |
| 72 | connection_loss(con); |
| 73 | return 0; |
| 74 | } |
| 75 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 76 | /* called in the case of a non blocking connect */ |
| 77 | static int msc_connection_connect(struct bsc_fd *fd, unsigned int what) |
| 78 | { |
| 79 | int rc; |
| 80 | int val; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 81 | struct bsc_msc_connection *con; |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 82 | struct write_queue *queue; |
| 83 | |
| 84 | socklen_t len = sizeof(val); |
| 85 | |
| 86 | if ((what & BSC_FD_WRITE) == 0) { |
| 87 | LOGP(DMSC, LOGL_ERROR, "Callback but not readable.\n"); |
| 88 | return -1; |
| 89 | } |
| 90 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 91 | queue = container_of(fd, struct write_queue, bfd); |
| 92 | con = container_of(queue, struct bsc_msc_connection, write_queue); |
| 93 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 94 | /* check the socket state */ |
| 95 | rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len); |
| 96 | if (rc != 0) { |
| 97 | LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n"); |
| 98 | goto error; |
| 99 | } |
| 100 | if (val != 0) { |
Holger Hans Peter Freyther | 9d90da9 | 2010-04-06 10:25:00 +0200 | [diff] [blame] | 101 | LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC: %d\n", val); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 102 | goto error; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | /* go to full operation */ |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 107 | fd->cb = write_queue_bfd_cb; |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 108 | fd->when = BSC_FD_READ | BSC_FD_EXCEPT; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 109 | |
| 110 | con->is_connected = 1; |
Holger Hans Peter Freyther | e47a91b | 2010-05-05 22:48:56 +0800 | [diff] [blame] | 111 | bsc_del_timer(&con->timeout_timer); |
Holger Hans Peter Freyther | b9ac37d | 2010-04-05 17:58:52 +0200 | [diff] [blame] | 112 | LOGP(DMSC, LOGL_NOTICE, "(Re)Connected to the MSC.\n"); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 113 | if (con->connected) |
| 114 | con->connected(con); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 115 | return 0; |
| 116 | |
| 117 | error: |
| 118 | bsc_unregister_fd(fd); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 119 | connection_loss(con); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 120 | return -1; |
| 121 | } |
| 122 | static void setnonblocking(struct bsc_fd *fd) |
| 123 | { |
| 124 | int flags; |
| 125 | |
| 126 | flags = fcntl(fd->fd, F_GETFL); |
| 127 | if (flags < 0) { |
| 128 | perror("fcntl get failed"); |
| 129 | close(fd->fd); |
| 130 | fd->fd = -1; |
| 131 | return; |
| 132 | } |
| 133 | |
| 134 | flags |= O_NONBLOCK; |
| 135 | flags = fcntl(fd->fd, F_SETFL, flags); |
| 136 | if (flags < 0) { |
| 137 | perror("fcntl get failed"); |
| 138 | close(fd->fd); |
| 139 | fd->fd = -1; |
| 140 | return; |
| 141 | } |
| 142 | } |
| 143 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 144 | int bsc_msc_connect(struct bsc_msc_connection *con) |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 145 | { |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 146 | struct bsc_fd *fd; |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 147 | struct sockaddr_in sin; |
| 148 | int on = 1, ret; |
| 149 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 150 | LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", con->ip, con->port); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 151 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 152 | con->is_connected = 0; |
| 153 | |
| 154 | fd = &con->write_queue.bfd; |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 155 | fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 156 | fd->priv_nr = 1; |
| 157 | |
| 158 | if (fd->fd < 0) { |
| 159 | perror("Creating TCP socket failed"); |
| 160 | return fd->fd; |
| 161 | } |
| 162 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 163 | /* make it non blocking */ |
| 164 | setnonblocking(fd); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 165 | |
Holger Hans Peter Freyther | ca999a9 | 2010-06-15 18:52:38 +0800 | [diff] [blame] | 166 | /* set the socket priority */ |
| 167 | ret = setsockopt(fd->fd, IPPROTO_IP, IP_TOS, |
| 168 | &con->prio, sizeof(con->prio)); |
| 169 | if (ret != 0) |
| 170 | LOGP(DMSC, LOGL_ERROR, "Failed to set prio to %d. %s\n", |
| 171 | con->prio, strerror(errno)); |
| 172 | |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 173 | memset(&sin, 0, sizeof(sin)); |
| 174 | sin.sin_family = AF_INET; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 175 | sin.sin_port = htons(con->port); |
| 176 | inet_aton(con->ip, &sin.sin_addr); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 177 | |
| 178 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 179 | ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin)); |
| 180 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 181 | if (ret == -1 && errno == EINPROGRESS) { |
| 182 | LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n"); |
| 183 | fd->when = BSC_FD_WRITE; |
| 184 | fd->cb = msc_connection_connect; |
Holger Hans Peter Freyther | e47a91b | 2010-05-05 22:48:56 +0800 | [diff] [blame] | 185 | con->timeout_timer.cb = msc_con_timeout; |
| 186 | con->timeout_timer.data = con; |
| 187 | bsc_schedule_timer(&con->timeout_timer, 20, 0); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 188 | } else if (ret < 0) { |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 189 | perror("Connection failed"); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 190 | connection_loss(con); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 191 | return ret; |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 192 | } else { |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 193 | fd->when = BSC_FD_READ | BSC_FD_EXCEPT; |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 194 | fd->cb = write_queue_bfd_cb; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 195 | con->is_connected = 1; |
| 196 | if (con->connected) |
| 197 | con->connected(con); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | ret = bsc_register_fd(fd); |
| 201 | if (ret < 0) { |
| 202 | perror("Registering the fd failed"); |
| 203 | close(fd->fd); |
| 204 | return ret; |
| 205 | } |
| 206 | |
| 207 | return ret; |
| 208 | } |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 209 | |
Holger Hans Peter Freyther | ca999a9 | 2010-06-15 18:52:38 +0800 | [diff] [blame] | 210 | struct bsc_msc_connection *bsc_msc_create(const char *ip, int port, int prio) |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 211 | { |
| 212 | struct bsc_msc_connection *con; |
| 213 | |
| 214 | con = talloc_zero(NULL, struct bsc_msc_connection); |
| 215 | if (!con) { |
| 216 | LOGP(DMSC, LOGL_FATAL, "Failed to create the MSC connection.\n"); |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | con->ip = ip; |
| 221 | con->port = port; |
Holger Hans Peter Freyther | ca999a9 | 2010-06-15 18:52:38 +0800 | [diff] [blame] | 222 | con->prio = prio; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 223 | write_queue_init(&con->write_queue, 100); |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 224 | con->write_queue.except_cb = bsc_msc_except; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 225 | return con; |
| 226 | } |
| 227 | |
| 228 | void bsc_msc_lost(struct bsc_msc_connection *con) |
| 229 | { |
Holger Hans Peter Freyther | 03ca97e | 2010-03-31 13:15:26 +0200 | [diff] [blame] | 230 | write_queue_clear(&con->write_queue); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 231 | bsc_unregister_fd(&con->write_queue.bfd); |
| 232 | connection_loss(con); |
| 233 | } |
| 234 | |
| 235 | static void reconnect_msc(void *_msc) |
| 236 | { |
| 237 | struct bsc_msc_connection *con = _msc; |
| 238 | |
| 239 | LOGP(DMSC, LOGL_NOTICE, "Attempting to reconnect to the MSC.\n"); |
| 240 | bsc_msc_connect(con); |
| 241 | } |
| 242 | |
| 243 | void bsc_msc_schedule_connect(struct bsc_msc_connection *con) |
| 244 | { |
| 245 | LOGP(DMSC, LOGL_NOTICE, "Attempting to reconnect to the MSC.\n"); |
| 246 | con->reconnect_timer.cb = reconnect_msc; |
| 247 | con->reconnect_timer.data = con; |
| 248 | bsc_schedule_timer(&con->reconnect_timer, 5, 0); |
Holger Hans Peter Freyther | f76e7ef | 2010-06-15 18:52:05 +0800 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | struct msgb *bsc_msc_id_get_resp(const char *token) |
| 252 | { |
| 253 | struct msgb *msg; |
| 254 | |
| 255 | if (!token) { |
| 256 | LOGP(DMSC, LOGL_ERROR, "No token specified.\n"); |
| 257 | return NULL; |
| 258 | } |
| 259 | |
| 260 | msg = msgb_alloc_headroom(4096, 128, "id resp"); |
| 261 | if (!msg) { |
| 262 | LOGP(DMSC, LOGL_ERROR, "Failed to create the message.\n"); |
| 263 | return NULL; |
| 264 | } |
| 265 | |
| 266 | msg->l2h = msgb_v_put(msg, IPAC_MSGT_ID_RESP); |
| 267 | msgb_l16tv_put(msg, strlen(token) + 1, |
| 268 | IPAC_IDTAG_UNITNAME, (u_int8_t *) token); |
| 269 | return msg; |
Holger Hans Peter Freyther | bec411b | 2010-07-05 14:14:18 +0800 | [diff] [blame] | 270 | } |