| /* OpenBSC Abis input driver for ip.access */ |
| |
| /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <time.h> |
| #include <sys/fcntl.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <sys/ioctl.h> |
| #include <arpa/inet.h> |
| |
| #include <openbsc/select.h> |
| #include <openbsc/msgb.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/abis_nm.h> |
| #include <openbsc/abis_rsl.h> |
| #include <openbsc/subchan_demux.h> |
| #include <openbsc/e1_input.h> |
| #include <openbsc/ipaccess.h> |
| |
| /* data structure for one E1 interface with A-bis */ |
| struct ia_e1_handle { |
| struct bsc_fd listen_fd; |
| struct bsc_fd rsl_listen_fd; |
| }; |
| |
| #define TS1_ALLOC_SIZE 300 |
| |
| static const u_int8_t pong[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG }; |
| static const u_int8_t id_ack[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK }; |
| |
| static int ipaccess_rcvmsg(struct msgb *msg, int fd) |
| { |
| u_int8_t msg_type = *(msg->l2h); |
| int ret = 0; |
| |
| switch (msg_type) { |
| case IPAC_MSGT_PING: |
| ret = write(fd, pong, sizeof(pong)); |
| break; |
| case IPAC_MSGT_PONG: |
| DEBUGP(DMI, "PONG!\n"); |
| break; |
| case IPAC_MSGT_ID_RESP: |
| DEBUGP(DMI, "ID_RESP\n"); |
| break; |
| case IPAC_MSGT_ID_ACK: |
| DEBUGP(DMI, "ID_ACK? -> ACK!\n"); |
| ret = write(fd, id_ack, sizeof(id_ack)); |
| break; |
| } |
| |
| msgb_free(msg); |
| return 0; |
| } |
| |
| /* FIXME: this is per BTS */ |
| static int oml_up = 0; |
| static int rsl_up = 0; |
| |
| static int handle_ts1_read(struct bsc_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct e1inp_sign_link *link; |
| struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE); |
| struct ipaccess_head *hh; |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| /* first read our 3-byte header */ |
| hh = (struct ipaccess_head *) msg->data; |
| ret = recv(bfd->fd, msg->data, 3, 0); |
| if (ret < 0) { |
| fprintf(stderr, "recv error %s\n", strerror(errno)); |
| return ret; |
| } |
| if (ret == 0) { |
| fprintf(stderr, "BTS disappeared, dead socket\n"); |
| e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL); |
| e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML); |
| bsc_unregister_fd(bfd); |
| close(bfd->fd); |
| bfd->fd = -1; |
| } |
| msgb_put(msg, ret); |
| |
| /* then read te length as specified in header */ |
| msg->l2h = msg->data + sizeof(*hh); |
| ret = recv(bfd->fd, msg->l2h, hh->len, 0); |
| if (ret < hh->len) { |
| fprintf(stderr, "short read!\n"); |
| msgb_free(msg); |
| return -EIO; |
| } |
| msgb_put(msg, ret); |
| |
| if (hh->proto == IPAC_PROTO_IPACCESS) |
| return ipaccess_rcvmsg(msg, bfd->fd); |
| |
| DEBUGP(DMI, "RX %u: %s\n", ts_nr, hexdump(msgb_l2(msg), ret)); |
| |
| link = e1inp_lookup_sign_link(e1i_ts, 0, hh->proto); |
| if (!link) { |
| printf("no matching signalling link for hh->proto=0x%02x\n", hh->proto); |
| msgb_free(msg); |
| return -EIO; |
| } |
| msg->trx = link->trx; |
| |
| switch (hh->proto) { |
| case IPAC_PROTO_RSL: |
| if (!rsl_up) { |
| e1inp_event(e1i_ts, EVT_E1_TEI_UP, 0, IPAC_PROTO_RSL); |
| rsl_up = 1; |
| } |
| ret = abis_rsl_rcvmsg(msg); |
| break; |
| case IPAC_PROTO_OML: |
| if (!oml_up) { |
| e1inp_event(e1i_ts, EVT_E1_TEI_UP, 0, IPAC_PROTO_OML); |
| oml_up = 1; |
| } |
| ret = abis_nm_rcvmsg(msg); |
| break; |
| default: |
| DEBUGP(DMI, "Unknown IP.access protocol proto=0x%02x\n", hh->proto); |
| msgb_free(msg); |
| break; |
| } |
| return ret; |
| } |
| |
| static int handle_ts1_write(struct bsc_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct e1inp_sign_link *sign_link; |
| struct msgb *msg; |
| struct ipaccess_head *hh; |
| u_int8_t *l2_data; |
| int ret; |
| |
| /* get the next msg for this timeslot */ |
| msg = e1inp_tx_ts(e1i_ts, &sign_link); |
| if (!msg) { |
| bfd->when &= ~BSC_FD_WRITE; |
| return 0; |
| } |
| |
| l2_data = msg->data; |
| |
| /* prepend the mISDNhead */ |
| hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh)); |
| hh->zero = 0; |
| hh->len = msg->len - sizeof(*hh); |
| |
| switch (sign_link->type) { |
| case E1INP_SIGN_OML: |
| hh->proto = IPAC_PROTO_OML; |
| break; |
| case E1INP_SIGN_RSL: |
| hh->proto = IPAC_PROTO_RSL; |
| break; |
| default: |
| msgb_free(msg); |
| return -EINVAL; |
| } |
| |
| DEBUGP(DMI, "TX %u: %s\n", ts_nr, hexdump(l2_data, hh->len)); |
| |
| ret = send(bfd->fd, msg->data, msg->len, 0); |
| msgb_free(msg); |
| usleep(100000); |
| |
| return ret; |
| } |
| |
| |
| /* callback from select.c in case one of the fd's can be read/written */ |
| static int ipaccess_fd_cb(struct bsc_fd *bfd, unsigned int what) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| unsigned int idx = ts_nr-1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| int rc = 0; |
| |
| switch (e1i_ts->type) { |
| case E1INP_TS_TYPE_SIGN: |
| if (what & BSC_FD_READ) |
| rc = handle_ts1_read(bfd); |
| if (what & BSC_FD_WRITE) |
| rc = handle_ts1_write(bfd); |
| break; |
| #if 0 |
| case E1INP_TS_TYPE_TRAU: |
| if (what & BSC_FD_READ) |
| rc = handle_tsX_read(bfd); |
| /* We never include the mISDN B-Channel FD into the |
| * writeset, since it doesn't support poll() based |
| * write flow control */ |
| break; |
| #endif |
| default: |
| fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| |
| static int ts_want_write(struct e1inp_ts *e1i_ts) |
| { |
| /* We never include the mISDN B-Channel FD into the |
| * writeset, since it doesn't support poll() based |
| * write flow control */ |
| if (e1i_ts->type == E1INP_TS_TYPE_TRAU) |
| return 0; |
| |
| e1i_ts->driver.ipaccess.fd.when |= BSC_FD_WRITE; |
| |
| return 0; |
| } |
| |
| struct e1inp_driver ipaccess_driver = { |
| .name = "ip.access", |
| .want_write = ts_want_write, |
| }; |
| |
| static int ia_e1_setup(struct e1inp_line *line) |
| { |
| return 0; |
| } |
| |
| static int listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what) |
| { |
| struct e1inp_line *line = listen_bfd->data; |
| int ret; |
| |
| if (what & BSC_FD_READ) { |
| int idx = 0; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| struct bsc_fd *bfd = &e1i_ts->driver.ipaccess.fd; |
| struct sockaddr_in sa; |
| socklen_t sa_len = sizeof(sa); |
| |
| if (bfd->fd) { |
| printf("dumping old OML fd\n"); |
| if (bfd->fd != -1) { |
| bsc_unregister_fd(bfd); |
| close(bfd->fd); |
| } |
| } |
| bfd->fd = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| if (bfd->fd < 0) { |
| perror("accept"); |
| return bfd->fd; |
| } |
| printf("accept()ed new OML fd\n"); |
| bfd->data = line; |
| bfd->priv_nr = 1; |
| bfd->cb = ipaccess_fd_cb; |
| bfd->when = BSC_FD_READ; |
| ret = bsc_register_fd(bfd); |
| if (ret < 0) { |
| fprintf(stderr, "could not register FD\n"); |
| return ret; |
| } |
| } |
| return 0; |
| } |
| |
| static int rsl_listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what) |
| { |
| struct e1inp_line *line = listen_bfd->data; |
| int ret; |
| |
| if (what & BSC_FD_READ) { |
| int idx = 1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| struct bsc_fd *bfd = &e1i_ts->driver.ipaccess.fd; |
| struct sockaddr_in sa; |
| socklen_t sa_len = sizeof(sa); |
| |
| if (bfd->fd) { |
| printf("dumping old RSL fd\n"); |
| if (bfd->fd != -1) { |
| bsc_unregister_fd(bfd); |
| close(bfd->fd); |
| } |
| } |
| bfd->fd = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| if (bfd->fd < 0) { |
| perror("accept"); |
| return bfd->fd; |
| } |
| printf("accept()ed new RSL fd\n"); |
| bfd->data = line; |
| bfd->priv_nr = 2; |
| bfd->cb = ipaccess_fd_cb; |
| bfd->when = BSC_FD_READ; |
| ret = bsc_register_fd(bfd); |
| if (ret < 0) { |
| fprintf(stderr, "could not register FD\n"); |
| return ret; |
| } |
| } |
| return 0; |
| } |
| |
| static int make_sock(struct bsc_fd *bfd, u_int16_t port, |
| struct e1inp_line *line, |
| int (*cb)(struct bsc_fd *fd, unsigned int what)) |
| { |
| struct sockaddr_in addr; |
| int ret, on = 1; |
| |
| bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| bfd->cb = cb; |
| bfd->when = BSC_FD_READ; |
| bfd->data = line; |
| |
| memset(&addr, 0, sizeof(addr)); |
| addr.sin_family = AF_INET; |
| addr.sin_port = htons(port); |
| addr.sin_addr.s_addr = INADDR_ANY; |
| |
| setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| |
| ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr)); |
| if (ret < 0) { |
| fprintf(stderr, "could not bind l2 socket %s\n", |
| strerror(errno)); |
| return -EIO; |
| } |
| |
| ret = listen(bfd->fd, 1); |
| if (ret < 0) { |
| perror("listen"); |
| return ret; |
| } |
| |
| ret = bsc_register_fd(bfd); |
| if (ret < 0) { |
| perror("register_listen_fd"); |
| return ret; |
| } |
| return 0; |
| } |
| |
| /* Actively connect to a BTS. Currently used by ipaccess-config.c */ |
| int ipaccess_connect(struct e1inp_line *line, struct sockaddr_in *sa) |
| { |
| struct e1inp_ts *e1i_ts = &line->ts[0]; |
| struct bsc_fd *bfd = &e1i_ts->driver.ipaccess.fd; |
| int ret, on = 1; |
| |
| bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| bfd->cb = ipaccess_fd_cb; |
| bfd->when = BSC_FD_READ | BSC_FD_WRITE; |
| bfd->data = line; |
| bfd->priv_nr = 1; |
| |
| setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| |
| ret = connect(bfd->fd, (struct sockaddr *) sa, sizeof(*sa)); |
| if (ret < 0) { |
| fprintf(stderr, "could not connect socket\n"); |
| close(bfd->fd); |
| return ret; |
| } |
| |
| ret = bsc_register_fd(bfd); |
| if (ret < 0) { |
| close(bfd->fd); |
| return ret; |
| } |
| |
| line->driver = &ipaccess_driver; |
| |
| return e1inp_line_register(line); |
| } |
| |
| int ipaccess_setup(struct e1inp_line *line) |
| { |
| struct ia_e1_handle *e1h; |
| int ret; |
| |
| /* register the driver with the core */ |
| /* FIXME: do this in the plugin initializer function */ |
| ret = e1inp_driver_register(&ipaccess_driver); |
| if (ret) |
| return ret; |
| |
| /* create the actual line instance */ |
| /* FIXME: do this independent of driver registration */ |
| e1h = malloc(sizeof(*e1h)); |
| memset(e1h, 0, sizeof(*e1h)); |
| |
| line->driver = &ipaccess_driver; |
| line->driver_data = e1h; |
| |
| /* Listen for OML connections */ |
| ret = make_sock(&e1h->listen_fd, 3002, line, listen_fd_cb); |
| |
| /* Listen for RSL connections */ |
| ret = make_sock(&e1h->rsl_listen_fd, 3003, line, rsl_listen_fd_cb); |
| |
| ret = ia_e1_setup(line); |
| if (ret) |
| return ret; |
| |
| return e1inp_line_register(line); |
| } |