Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1 | /* sysmo_sock.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <stdio.h> |
| 21 | #include <unistd.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <errno.h> |
| 25 | #include <assert.h> |
| 26 | #include <sys/socket.h> |
| 27 | #include <sys/un.h> |
| 28 | extern "C" { |
| 29 | #include <osmocom/core/talloc.h> |
| 30 | #include <osmocom/core/select.h> |
| 31 | #include <osmocom/core/msgb.h> |
| 32 | } |
| 33 | |
| 34 | #include <gprs_rlcmac.h> |
| 35 | #include <pcu_l1_if.h> |
| 36 | #include <gprs_debug.h> |
| 37 | #include <gprs_bssgp_pcu.h> |
| 38 | #include <pcuif_proto.h> |
| 39 | |
Andreas Eversberg | e266bd4 | 2012-07-13 14:00:21 +0200 | [diff] [blame] | 40 | extern void *tall_pcu_ctx; |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 41 | |
| 42 | /* |
| 43 | * SYSMO-PCU socket functions |
| 44 | */ |
| 45 | |
| 46 | struct pcu_sock_state { |
| 47 | struct osmo_fd conn_bfd; /* fd for connection to lcr */ |
| 48 | struct osmo_timer_list timer; /* socket connect retry timer */ |
| 49 | struct llist_head upqueue; /* queue for sending messages */ |
| 50 | } *pcu_sock_state = NULL; |
| 51 | |
| 52 | static void pcu_sock_timeout(void *_priv); |
| 53 | |
| 54 | int pcu_sock_send(struct msgb *msg) |
| 55 | { |
| 56 | struct pcu_sock_state *state = pcu_sock_state; |
| 57 | struct osmo_fd *conn_bfd; |
| 58 | |
| 59 | if (!state) { |
| 60 | LOGP(DL1IF, LOGL_NOTICE, "PCU socket not created, dropping " |
| 61 | "message\n"); |
| 62 | return -EINVAL; |
| 63 | } |
| 64 | conn_bfd = &state->conn_bfd; |
| 65 | if (conn_bfd->fd <= 0) { |
| 66 | LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping " |
| 67 | "message\n"); |
| 68 | return -EIO; |
| 69 | } |
| 70 | msgb_enqueue(&state->upqueue, msg); |
| 71 | conn_bfd->when |= BSC_FD_WRITE; |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static void pcu_sock_close(struct pcu_sock_state *state) |
| 77 | { |
| 78 | struct osmo_fd *bfd = &state->conn_bfd; |
| 79 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 80 | struct gprs_rlcmac_tbf *tbf; |
| 81 | uint8_t trx, ts, tfi; |
| 82 | |
| 83 | LOGP(DL1IF, LOGL_NOTICE, "PCU socket has LOST connection\n"); |
| 84 | |
| 85 | close(bfd->fd); |
| 86 | bfd->fd = -1; |
| 87 | osmo_fd_unregister(bfd); |
| 88 | |
| 89 | /* flush the queue */ |
| 90 | while (!llist_empty(&state->upqueue)) { |
| 91 | struct msgb *msg = msgb_dequeue(&state->upqueue); |
| 92 | msgb_free(msg); |
| 93 | } |
| 94 | |
| 95 | /* disable all slots, kick all TBFs */ |
| 96 | for (trx = 0; trx < 8; trx++) { |
| 97 | for (ts = 0; ts < 8; ts++) { |
| 98 | bts->trx[trx].pdch[ts].enable = 0; |
| 99 | for (tfi = 0; tfi < 32; tfi++) { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 100 | tbf = bts->trx[trx].pdch[ts].ul_tbf[tfi]; |
| 101 | if (tbf) |
| 102 | tbf_free(tbf); |
| 103 | tbf = bts->trx[trx].pdch[ts].dl_tbf[tfi]; |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 104 | if (tbf) |
| 105 | tbf_free(tbf); |
| 106 | } |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | gprs_bssgp_destroy(); |
| 111 | |
| 112 | state->timer.cb = pcu_sock_timeout; |
| 113 | osmo_timer_schedule(&state->timer, 5, 0); |
| 114 | } |
| 115 | |
| 116 | static int pcu_sock_read(struct osmo_fd *bfd) |
| 117 | { |
| 118 | struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; |
| 119 | struct gsm_pcu_if *pcu_prim; |
| 120 | struct msgb *msg; |
| 121 | int rc; |
| 122 | |
| 123 | msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx"); |
| 124 | if (!msg) |
| 125 | return -ENOMEM; |
| 126 | |
| 127 | pcu_prim = (struct gsm_pcu_if *) msg->tail; |
| 128 | |
| 129 | rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0); |
| 130 | if (rc == 0) |
| 131 | goto close; |
| 132 | |
| 133 | if (rc < 0) { |
| 134 | if (errno == EAGAIN) |
| 135 | return 0; |
| 136 | goto close; |
| 137 | } |
| 138 | |
| 139 | rc = pcu_rx(pcu_prim->msg_type, pcu_prim); |
| 140 | |
| 141 | /* as we always synchronously process the message in pcu_rx() and |
| 142 | * its callbacks, we can free the message here. */ |
| 143 | msgb_free(msg); |
| 144 | |
| 145 | return rc; |
| 146 | |
| 147 | close: |
| 148 | msgb_free(msg); |
| 149 | pcu_sock_close(state); |
| 150 | return -1; |
| 151 | } |
| 152 | |
| 153 | static int pcu_sock_write(struct osmo_fd *bfd) |
| 154 | { |
| 155 | struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; |
| 156 | int rc; |
| 157 | |
| 158 | while (!llist_empty(&state->upqueue)) { |
| 159 | struct msgb *msg, *msg2; |
| 160 | struct gsm_pcu_if *pcu_prim; |
| 161 | |
| 162 | /* peek at the beginning of the queue */ |
| 163 | msg = llist_entry(state->upqueue.next, struct msgb, list); |
| 164 | pcu_prim = (struct gsm_pcu_if *)msg->data; |
| 165 | |
| 166 | bfd->when &= ~BSC_FD_WRITE; |
| 167 | |
| 168 | /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */ |
| 169 | if (!msgb_length(msg)) { |
| 170 | LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO " |
| 171 | "bytes!\n", pcu_prim->msg_type); |
| 172 | goto dontsend; |
| 173 | } |
| 174 | |
| 175 | /* try to send it over the socket */ |
| 176 | rc = write(bfd->fd, msgb_data(msg), msgb_length(msg)); |
| 177 | if (rc == 0) |
| 178 | goto close; |
| 179 | if (rc < 0) { |
| 180 | if (errno == EAGAIN) { |
| 181 | bfd->when |= BSC_FD_WRITE; |
| 182 | break; |
| 183 | } |
| 184 | goto close; |
| 185 | } |
| 186 | |
| 187 | dontsend: |
| 188 | /* _after_ we send it, we can deueue */ |
| 189 | msg2 = msgb_dequeue(&state->upqueue); |
| 190 | assert(msg == msg2); |
| 191 | msgb_free(msg); |
| 192 | } |
| 193 | return 0; |
| 194 | |
| 195 | close: |
| 196 | pcu_sock_close(state); |
| 197 | |
| 198 | return -1; |
| 199 | } |
| 200 | |
| 201 | static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags) |
| 202 | { |
| 203 | int rc = 0; |
| 204 | |
| 205 | if (flags & BSC_FD_READ) |
| 206 | rc = pcu_sock_read(bfd); |
| 207 | if (rc < 0) |
| 208 | return rc; |
| 209 | |
| 210 | if (flags & BSC_FD_WRITE) |
| 211 | rc = pcu_sock_write(bfd); |
| 212 | |
| 213 | return rc; |
| 214 | } |
| 215 | |
| 216 | int pcu_l1if_open(void) |
| 217 | { |
| 218 | struct pcu_sock_state *state; |
| 219 | struct osmo_fd *bfd; |
| 220 | struct sockaddr_un local; |
| 221 | unsigned int namelen; |
| 222 | int rc; |
| 223 | |
| 224 | state = pcu_sock_state; |
| 225 | if (!state) { |
Andreas Eversberg | e266bd4 | 2012-07-13 14:00:21 +0200 | [diff] [blame] | 226 | state = talloc_zero(tall_pcu_ctx, struct pcu_sock_state); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 227 | if (!state) |
| 228 | return -ENOMEM; |
| 229 | INIT_LLIST_HEAD(&state->upqueue); |
| 230 | } |
| 231 | |
| 232 | bfd = &state->conn_bfd; |
| 233 | |
| 234 | bfd->fd = socket(AF_UNIX, SOCK_SEQPACKET, 0); |
| 235 | if (bfd->fd < 0) { |
| 236 | LOGP(DL1IF, LOGL_ERROR, "Failed to create PCU-SYSMO socket.\n"); |
| 237 | talloc_free(state); |
| 238 | return -1; |
| 239 | } |
| 240 | |
| 241 | local.sun_family = AF_UNIX; |
| 242 | strncpy(local.sun_path, "/tmp/pcu_bts", sizeof(local.sun_path)); |
| 243 | local.sun_path[sizeof(local.sun_path) - 1] = '\0'; |
| 244 | |
| 245 | /* we use the same magic that X11 uses in Xtranssock.c for |
| 246 | * calculating the proper length of the sockaddr */ |
| 247 | #if defined(BSD44SOCKETS) || defined(__UNIXWARE__) |
| 248 | local.sun_len = strlen(local.sun_path); |
| 249 | #endif |
| 250 | #if defined(BSD44SOCKETS) || defined(SUN_LEN) |
| 251 | namelen = SUN_LEN(&local); |
| 252 | #else |
| 253 | namelen = strlen(local.sun_path) + |
| 254 | offsetof(struct sockaddr_un, sun_path); |
| 255 | #endif |
| 256 | rc = connect(bfd->fd, (struct sockaddr *) &local, namelen); |
| 257 | if (rc != 0) { |
| 258 | LOGP(DL1IF, LOGL_ERROR, "Failed to Connect the PCU-SYSMO " |
| 259 | "socket, delaying... '%s'\n", local.sun_path); |
| 260 | close(bfd->fd); |
| 261 | bfd->fd = -1; |
| 262 | state->timer.cb = pcu_sock_timeout; |
| 263 | osmo_timer_schedule(&state->timer, 5, 0); |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | bfd->when = BSC_FD_READ; |
| 268 | bfd->cb = pcu_sock_cb; |
| 269 | bfd->data = state; |
| 270 | |
| 271 | rc = osmo_fd_register(bfd); |
| 272 | if (rc < 0) { |
| 273 | LOGP(DL1IF, LOGL_ERROR, "Could not register PCU fd: %d\n", rc); |
| 274 | close(bfd->fd); |
| 275 | talloc_free(state); |
| 276 | return rc; |
| 277 | } |
| 278 | |
| 279 | LOGP(DL1IF, LOGL_NOTICE, "PCU-SYSMO socket has been connected\n"); |
| 280 | |
| 281 | pcu_sock_state = state; |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | void pcu_l1if_close(void) |
| 287 | { |
| 288 | struct pcu_sock_state *state = pcu_sock_state; |
| 289 | struct osmo_fd *bfd; |
| 290 | |
| 291 | if (!state) |
| 292 | return; |
| 293 | |
| 294 | if (osmo_timer_pending(&state->timer)) |
| 295 | osmo_timer_del(&state->timer); |
| 296 | |
| 297 | bfd = &state->conn_bfd; |
| 298 | if (bfd->fd > 0) |
| 299 | pcu_sock_close(state); |
| 300 | talloc_free(state); |
| 301 | pcu_sock_state = NULL; |
| 302 | } |
| 303 | |
| 304 | static void pcu_sock_timeout(void *_priv) |
| 305 | { |
| 306 | pcu_l1if_open(); |
| 307 | } |