Andreas Eversberg | a23c7ee | 2012-12-18 10:47:28 +0100 | [diff] [blame] | 1 | /* Interface handler for Sysmocom L1 (forwarding) */ |
| 2 | |
| 3 | /* (C) 2011 by Harald Welte <laforge@gnumonks.org> |
| 4 | * |
| 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 Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 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 Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <stdint.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <unistd.h> |
| 25 | #include <errno.h> |
| 26 | #include <fcntl.h> |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/stat.h> |
| 30 | #include <sys/socket.h> |
| 31 | |
| 32 | #include <netinet/in.h> |
| 33 | #include <arpa/inet.h> |
| 34 | |
| 35 | #include <osmocom/core/talloc.h> |
| 36 | #include <osmocom/core/utils.h> |
| 37 | #include <osmocom/core/select.h> |
| 38 | #include <osmocom/core/write_queue.h> |
| 39 | #include <osmocom/core/msgb.h> |
| 40 | #include <osmocom/core/socket.h> |
| 41 | #include <osmocom/core/timer.h> |
| 42 | #include <osmocom/gsm/gsm_utils.h> |
| 43 | |
| 44 | #include <sysmocom/femtobts/superfemto.h> |
| 45 | #include <sysmocom/femtobts/gsml1prim.h> |
| 46 | #include <sysmocom/femtobts/gsml1const.h> |
| 47 | #include <sysmocom/femtobts/gsml1types.h> |
| 48 | |
| 49 | #include "gprs_debug.h" |
| 50 | #include "sysmo_l1_if.h" |
| 51 | |
| 52 | |
| 53 | #define L1FWD_L1_PORT 9999 |
| 54 | #define L1FWD_SYS_PORT 9998 |
| 55 | #define L1FWD_TCH_PORT 9997 |
| 56 | #define L1FWD_PDTCH_PORT 9996 |
| 57 | |
| 58 | static const uint16_t fwd_udp_ports[] = { |
| 59 | [MQ_SYS_WRITE] = L1FWD_SYS_PORT, |
| 60 | [MQ_L1_WRITE] = L1FWD_L1_PORT, |
| 61 | [MQ_TCH_WRITE] = L1FWD_TCH_PORT, |
| 62 | [MQ_PDTCH_WRITE]= L1FWD_PDTCH_PORT, |
| 63 | }; |
| 64 | |
| 65 | static int fwd_read_cb(struct osmo_fd *ofd) |
| 66 | { |
| 67 | struct msgb *msg = msgb_alloc_headroom(sizeof(SuperFemto_Prim_t) + 128, |
| 68 | 128, "udp_rx"); |
| 69 | struct femtol1_hdl *fl1h = ofd->data; |
| 70 | int rc; |
| 71 | |
| 72 | if (!msg) |
| 73 | return -ENOMEM; |
| 74 | |
| 75 | msg->l1h = msg->data; |
| 76 | rc = read(ofd->fd, msg->l1h, msgb_tailroom(msg)); |
| 77 | if (rc < 0) { |
| 78 | LOGP(DL1IF, LOGL_ERROR, "Short read from UDP\n"); |
| 79 | msgb_free(msg); |
| 80 | return rc; |
| 81 | } else if (rc == 0) { |
| 82 | LOGP(DL1IF, LOGL_ERROR, "Len=0 from UDP\n"); |
| 83 | msgb_free(msg); |
| 84 | return rc; |
| 85 | } |
| 86 | msgb_put(msg, rc); |
| 87 | |
| 88 | if (ofd->priv_nr == MQ_SYS_WRITE) |
| 89 | rc = l1if_handle_sysprim(fl1h, msg); |
| 90 | else |
| 91 | rc = l1if_handle_l1prim(ofd->priv_nr, fl1h, msg); |
| 92 | |
| 93 | return rc; |
| 94 | } |
| 95 | |
| 96 | static int prim_write_cb(struct osmo_fd *ofd, struct msgb *msg) |
| 97 | { |
| 98 | /* write to the fd */ |
| 99 | return write(ofd->fd, msg->head, msg->len); |
| 100 | } |
| 101 | |
| 102 | int l1if_transport_open(int q, struct femtol1_hdl *fl1h) |
| 103 | { |
| 104 | int rc; |
| 105 | char *bts_host = getenv("L1FWD_BTS_HOST"); |
| 106 | |
| 107 | printf("sizeof(GsmL1_Prim_t) = %zu\n", sizeof(GsmL1_Prim_t)); |
| 108 | printf("sizeof(SuperFemto_Prim_t) = %zu\n", sizeof(SuperFemto_Prim_t)); |
| 109 | |
| 110 | if (!bts_host) { |
| 111 | fprintf(stderr, "You have to set the L1FWD_BTS_HOST environment variable\n"); |
| 112 | exit(2); |
| 113 | } |
| 114 | |
| 115 | struct osmo_wqueue *wq = &fl1h->write_q[q]; |
| 116 | struct osmo_fd *ofd = &wq->bfd; |
| 117 | |
| 118 | osmo_wqueue_init(wq, 10); |
| 119 | wq->write_cb = prim_write_cb; |
| 120 | wq->read_cb = fwd_read_cb; |
| 121 | |
Harald Welte | 8347359 | 2020-10-19 12:56:30 +0200 | [diff] [blame] | 122 | osmo_fd_setup(ofd, -1, OSMO_FD_READ, osmo_wqueue_bfd_cb, fl1h, q); |
Andreas Eversberg | a23c7ee | 2012-12-18 10:47:28 +0100 | [diff] [blame] | 123 | rc = osmo_sock_init_ofd(ofd, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, |
| 124 | bts_host, fwd_udp_ports[q], |
| 125 | OSMO_SOCK_F_CONNECT); |
| 126 | if (rc < 0) |
| 127 | return rc; |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | int l1if_transport_close(int q, struct femtol1_hdl *fl1h) |
| 133 | { |
| 134 | struct osmo_wqueue *wq = &fl1h->write_q[q]; |
| 135 | struct osmo_fd *ofd = &wq->bfd; |
| 136 | |
| 137 | osmo_wqueue_clear(wq); |
| 138 | osmo_fd_unregister(ofd); |
| 139 | close(ofd->fd); |
| 140 | |
| 141 | return 0; |
| 142 | } |