Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 1 | /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| 2 | /* The protocol implementation */ |
| 3 | |
| 4 | /* |
| 5 | * (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 6 | * (C) 2009-2010 by On-Waves |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <string.h> |
Holger Hans Peter Freyther | adb1992 | 2010-05-14 02:14:09 +0800 | [diff] [blame] | 26 | #include <stdlib.h> |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 27 | #include <unistd.h> |
Holger Hans Peter Freyther | 9d7bd81 | 2010-04-07 12:55:40 +0200 | [diff] [blame] | 28 | #include <errno.h> |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 29 | |
| 30 | #include <sys/socket.h> |
| 31 | #include <arpa/inet.h> |
| 32 | |
Holger Hans Peter Freyther | f41fb1f | 2010-02-26 20:16:37 +0100 | [diff] [blame] | 33 | #include <osmocore/msgb.h> |
Holger Hans Peter Freyther | f41fb1f | 2010-02-26 20:16:37 +0100 | [diff] [blame] | 34 | #include <osmocore/select.h> |
| 35 | |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 36 | #include <openbsc/debug.h> |
| 37 | #include <openbsc/mgcp.h> |
| 38 | #include <openbsc/mgcp_internal.h> |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 39 | |
| 40 | #warning "Make use of the rtp proxy code" |
| 41 | |
Holger Hans Peter Freyther | 19f4aa5 | 2010-10-12 15:39:46 +0200 | [diff] [blame] | 42 | /* attempt to determine byte order */ |
| 43 | #include <sys/types.h> |
| 44 | #include <sys/param.h> |
| 45 | #include <limits.h> |
| 46 | |
| 47 | #ifndef __BYTE_ORDER |
| 48 | #error "__BYTE_ORDER should be defined by someone" |
| 49 | #endif |
| 50 | |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 51 | /* according to rtp_proxy.c RFC 3550 */ |
| 52 | struct rtp_hdr { |
| 53 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
Holger Hans Peter Freyther | 1979f79 | 2010-07-23 18:56:26 +0800 | [diff] [blame] | 54 | uint8_t csrc_count:4, |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 55 | extension:1, |
| 56 | padding:1, |
| 57 | version:2; |
Holger Hans Peter Freyther | 1979f79 | 2010-07-23 18:56:26 +0800 | [diff] [blame] | 58 | uint8_t payload_type:7, |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 59 | marker:1; |
| 60 | #elif __BYTE_ORDER == __BIG_ENDIAN |
Holger Hans Peter Freyther | 1979f79 | 2010-07-23 18:56:26 +0800 | [diff] [blame] | 61 | uint8_t version:2, |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 62 | padding:1, |
| 63 | extension:1, |
| 64 | csrc_count:4; |
Holger Hans Peter Freyther | 1979f79 | 2010-07-23 18:56:26 +0800 | [diff] [blame] | 65 | uint8_t marker:1, |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 66 | payload_type:7; |
| 67 | #endif |
Holger Hans Peter Freyther | 1884623 | 2010-07-23 18:56:01 +0800 | [diff] [blame] | 68 | uint16_t sequence; |
Holger Hans Peter Freyther | 142475b | 2010-07-23 18:55:38 +0800 | [diff] [blame] | 69 | uint32_t timestamp; |
| 70 | uint32_t ssrc; |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 71 | } __attribute__((packed)); |
| 72 | |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 73 | |
| 74 | enum { |
| 75 | DEST_NETWORK = 0, |
| 76 | DEST_BTS = 1, |
| 77 | }; |
| 78 | |
| 79 | enum { |
| 80 | PROTO_RTP, |
| 81 | PROTO_RTCP, |
| 82 | }; |
| 83 | |
Holger Hans Peter Freyther | b689426 | 2010-04-21 21:25:13 +0800 | [diff] [blame] | 84 | #define DUMMY_LOAD 0x23 |
| 85 | |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 86 | |
| 87 | static int udp_send(int fd, struct in_addr *addr, int port, char *buf, int len) |
| 88 | { |
| 89 | struct sockaddr_in out; |
| 90 | out.sin_family = AF_INET; |
| 91 | out.sin_port = port; |
| 92 | memcpy(&out.sin_addr, addr, sizeof(*addr)); |
| 93 | |
| 94 | return sendto(fd, buf, len, 0, (struct sockaddr *)&out, sizeof(out)); |
| 95 | } |
| 96 | |
Holger Hans Peter Freyther | b689426 | 2010-04-21 21:25:13 +0800 | [diff] [blame] | 97 | int mgcp_send_dummy(struct mgcp_endpoint *endp) |
| 98 | { |
| 99 | static char buf[] = { DUMMY_LOAD }; |
| 100 | |
Holger Hans Peter Freyther | bfb68b7 | 2010-08-05 03:37:22 +0800 | [diff] [blame] | 101 | return udp_send(endp->net_end.rtp.fd, &endp->net_end.addr, |
Holger Hans Peter Freyther | fab76aa | 2010-08-05 01:34:51 +0800 | [diff] [blame] | 102 | endp->net_end.rtp_port, buf, 1); |
Holger Hans Peter Freyther | b689426 | 2010-04-21 21:25:13 +0800 | [diff] [blame] | 103 | } |
| 104 | |
Holger Hans Peter Freyther | b1e9ba9 | 2010-08-04 22:20:34 +0800 | [diff] [blame] | 105 | static void patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *state, |
| 106 | int payload, struct sockaddr_in *addr, char *data, int len) |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 107 | { |
Holger Hans Peter Freyther | e758d95 | 2010-07-29 02:38:39 +0800 | [diff] [blame] | 108 | uint16_t seq; |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 109 | uint32_t timestamp; |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 110 | struct rtp_hdr *rtp_hdr; |
| 111 | |
| 112 | if (len < sizeof(*rtp_hdr)) |
| 113 | return; |
| 114 | |
Holger Hans Peter Freyther | e758d95 | 2010-07-29 02:38:39 +0800 | [diff] [blame] | 115 | rtp_hdr = (struct rtp_hdr *) data; |
| 116 | seq = ntohs(rtp_hdr->sequence); |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 117 | timestamp = ntohl(rtp_hdr->timestamp); |
Holger Hans Peter Freyther | e758d95 | 2010-07-29 02:38:39 +0800 | [diff] [blame] | 118 | |
Holger Hans Peter Freyther | 84ba528 | 2010-08-03 11:59:04 +0000 | [diff] [blame] | 119 | if (!state->initialized) { |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 120 | state->seq_no = seq - 1; |
| 121 | state->ssrc = state->orig_ssrc = rtp_hdr->ssrc; |
Holger Hans Peter Freyther | 84ba528 | 2010-08-03 11:59:04 +0000 | [diff] [blame] | 122 | state->initialized = 1; |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 123 | state->last_timestamp = timestamp; |
| 124 | } else if (state->ssrc != rtp_hdr->ssrc) { |
| 125 | state->ssrc = rtp_hdr->ssrc; |
| 126 | state->seq_offset = (state->seq_no + 1) - seq; |
| 127 | state->timestamp_offset = state->last_timestamp - timestamp; |
Holger Hans Peter Freyther | 73aa514 | 2010-08-05 12:07:00 +0000 | [diff] [blame] | 128 | state->patch = endp->allow_patch; |
Holger Hans Peter Freyther | eb0446b | 2010-08-04 21:45:39 +0800 | [diff] [blame] | 129 | LOGP(DMGCP, LOGL_NOTICE, |
Holger Hans Peter Freyther | 8e2acb7 | 2010-08-04 22:14:46 +0800 | [diff] [blame] | 130 | "The SSRC changed on 0x%x SSRC: %u offset: %d from %s:%d in %d\n", |
Holger Hans Peter Freyther | b1e9ba9 | 2010-08-04 22:20:34 +0800 | [diff] [blame] | 131 | ENDPOINT_NUMBER(endp), state->ssrc, state->seq_offset, |
| 132 | inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), endp->conn_mode); |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 133 | } |
Holger Hans Peter Freyther | e758d95 | 2010-07-29 02:38:39 +0800 | [diff] [blame] | 134 | |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 135 | /* apply the offset and store it back to the packet */ |
Holger Hans Peter Freyther | 6230eb2 | 2010-08-03 15:36:57 +0000 | [diff] [blame] | 136 | if (state->patch) { |
| 137 | seq += state->seq_offset; |
| 138 | rtp_hdr->sequence = htons(seq); |
| 139 | rtp_hdr->ssrc = state->orig_ssrc; |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 140 | |
Holger Hans Peter Freyther | 6230eb2 | 2010-08-03 15:36:57 +0000 | [diff] [blame] | 141 | timestamp += state->timestamp_offset; |
| 142 | rtp_hdr->timestamp = htonl(timestamp); |
| 143 | } |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 144 | |
| 145 | /* seq changed, now compare if we have lost something */ |
| 146 | if (state->seq_no + 1u != seq) |
| 147 | state->lost_no = abs(seq - (state->seq_no + 1)); |
Holger Hans Peter Freyther | 84ba528 | 2010-08-03 11:59:04 +0000 | [diff] [blame] | 148 | state->seq_no = seq; |
Holger Hans Peter Freyther | e758d95 | 2010-07-29 02:38:39 +0800 | [diff] [blame] | 149 | |
Holger Hans Peter Freyther | 3040ed4 | 2010-08-03 14:35:50 +0000 | [diff] [blame] | 150 | state->last_timestamp = timestamp; |
| 151 | |
Holger Hans Peter Freyther | 0052955 | 2010-04-06 11:15:50 +0200 | [diff] [blame] | 152 | if (payload < 0) |
| 153 | return; |
| 154 | |
Holger Hans Peter Freyther | f95e3ad | 2010-02-26 13:42:58 +0100 | [diff] [blame] | 155 | rtp_hdr->payload_type = payload; |
| 156 | } |
| 157 | |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 158 | /* |
Holger Hans Peter Freyther | cd144d5 | 2010-08-05 06:19:24 +0800 | [diff] [blame] | 159 | * The below code is for dispatching. We have a dedicated port for |
| 160 | * the data coming from the net and one to discover the BTS. |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 161 | */ |
Holger Hans Peter Freyther | 8fdb95e | 2010-08-06 01:12:21 +0800 | [diff] [blame] | 162 | static int forward_data(int fd, struct mgcp_rtp_tap *tap, const char *buf, int len) |
| 163 | { |
| 164 | if (!tap->enabled) |
| 165 | return 0; |
| 166 | |
| 167 | return sendto(fd, buf, len, 0, |
| 168 | (struct sockaddr *)&tap->forward, sizeof(tap->forward)); |
| 169 | } |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 170 | |
| 171 | static int send_transcoder(struct mgcp_endpoint *endp, int is_rtp, |
| 172 | const char *buf, int len) |
| 173 | { |
| 174 | int rc; |
| 175 | int port; |
| 176 | struct mgcp_config *cfg = endp->cfg; |
| 177 | struct sockaddr_in addr; |
| 178 | |
Holger Hans Peter Freyther | b6345ab | 2010-11-01 20:53:31 +0100 | [diff] [blame] | 179 | if (endp->trans_net.rtp_port == 0) { |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 180 | LOGP(DMGCP, LOGL_ERROR, "Transcoder port not known on 0x%x\n", |
| 181 | ENDPOINT_NUMBER(endp)); |
| 182 | return -1; |
| 183 | } |
| 184 | |
Holger Hans Peter Freyther | d582b20 | 2010-09-19 04:21:39 +0800 | [diff] [blame] | 185 | port = rtp_calculate_port(ENDPOINT_NUMBER(endp), cfg->transcoder_remote_base); |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 186 | if (!is_rtp) |
| 187 | port += 1; |
| 188 | |
| 189 | addr.sin_family = AF_INET; |
| 190 | addr.sin_addr = cfg->transcoder_in; |
| 191 | addr.sin_port = htons(port); |
| 192 | |
| 193 | rc = sendto(is_rtp ? |
Holger Hans Peter Freyther | c983f83 | 2010-11-01 21:04:54 +0100 | [diff] [blame] | 194 | endp->trans_bts.rtp.fd : |
| 195 | endp->trans_bts.rtcp.fd, buf, len, 0, |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 196 | (struct sockaddr *) &addr, sizeof(addr)); |
| 197 | |
| 198 | if (rc != len) |
| 199 | LOGP(DMGCP, LOGL_ERROR, |
| 200 | "Failed to send data to the transcoder: %s\n", |
| 201 | strerror(errno)); |
| 202 | |
| 203 | return rc; |
| 204 | } |
| 205 | |
Holger Hans Peter Freyther | cd144d5 | 2010-08-05 06:19:24 +0800 | [diff] [blame] | 206 | static int send_to(struct mgcp_endpoint *endp, int dest, int is_rtp, |
| 207 | struct sockaddr_in *addr, char *buf, int rc) |
| 208 | { |
Holger Hans Peter Freyther | 84026ba | 2010-08-05 06:31:58 +0800 | [diff] [blame] | 209 | struct mgcp_config *cfg = endp->cfg; |
| 210 | /* For loop toggle the destination and then dispatch. */ |
| 211 | if (cfg->audio_loop) |
| 212 | dest = !dest; |
| 213 | |
| 214 | /* Loop based on the conn_mode, maybe undoing the above */ |
| 215 | if (endp->conn_mode == MGCP_CONN_LOOPBACK) |
| 216 | dest = !dest; |
| 217 | |
Holger Hans Peter Freyther | cd144d5 | 2010-08-05 06:19:24 +0800 | [diff] [blame] | 218 | if (dest == DEST_NETWORK) { |
| 219 | if (is_rtp) { |
| 220 | patch_and_count(endp, &endp->bts_state, |
| 221 | endp->net_end.payload_type, |
| 222 | addr, buf, rc); |
Holger Hans Peter Freyther | 8fdb95e | 2010-08-06 01:12:21 +0800 | [diff] [blame] | 223 | forward_data(endp->net_end.rtp.fd, |
| 224 | &endp->taps[MGCP_TAP_NET_OUT], buf, rc); |
Holger Hans Peter Freyther | cd144d5 | 2010-08-05 06:19:24 +0800 | [diff] [blame] | 225 | return udp_send(endp->net_end.rtp.fd, &endp->net_end.addr, |
| 226 | endp->net_end.rtp_port, buf, rc); |
| 227 | } else { |
| 228 | return udp_send(endp->net_end.rtcp.fd, &endp->net_end.addr, |
| 229 | endp->net_end.rtcp_port, buf, rc); |
| 230 | } |
| 231 | } else { |
| 232 | if (is_rtp) { |
| 233 | patch_and_count(endp, &endp->net_state, |
| 234 | endp->bts_end.payload_type, |
| 235 | addr, buf, rc); |
Holger Hans Peter Freyther | 8fdb95e | 2010-08-06 01:12:21 +0800 | [diff] [blame] | 236 | forward_data(endp->bts_end.rtp.fd, |
| 237 | &endp->taps[MGCP_TAP_BTS_OUT], buf, rc); |
Holger Hans Peter Freyther | cd144d5 | 2010-08-05 06:19:24 +0800 | [diff] [blame] | 238 | return udp_send(endp->bts_end.rtp.fd, &endp->bts_end.addr, |
| 239 | endp->bts_end.rtp_port, buf, rc); |
| 240 | } else { |
| 241 | return udp_send(endp->bts_end.rtcp.fd, &endp->bts_end.addr, |
| 242 | endp->bts_end.rtcp_port, buf, rc); |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | |
Holger Hans Peter Freyther | 10b2e7a | 2010-08-05 06:27:22 +0800 | [diff] [blame] | 247 | static int recevice_from(struct mgcp_endpoint *endp, int fd, struct sockaddr_in *addr, |
| 248 | char *buf, int bufsize) |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 249 | { |
Holger Hans Peter Freyther | 10b2e7a | 2010-08-05 06:27:22 +0800 | [diff] [blame] | 250 | int rc; |
| 251 | socklen_t slen = sizeof(*addr); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 252 | |
Holger Hans Peter Freyther | 10b2e7a | 2010-08-05 06:27:22 +0800 | [diff] [blame] | 253 | rc = recvfrom(fd, buf, bufsize, 0, |
| 254 | (struct sockaddr *) addr, &slen); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 255 | if (rc < 0) { |
Holger Hans Peter Freyther | 9d7bd81 | 2010-04-07 12:55:40 +0200 | [diff] [blame] | 256 | LOGP(DMGCP, LOGL_ERROR, "Failed to receive message on: 0x%x errno: %d/%s\n", |
| 257 | ENDPOINT_NUMBER(endp), errno, strerror(errno)); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 258 | return -1; |
| 259 | } |
| 260 | |
| 261 | /* do not forward aynthing... maybe there is a packet from the bts */ |
Holger Hans Peter Freyther | e15223b | 2010-08-06 18:03:11 +0800 | [diff] [blame] | 262 | if (!endp->allocated) |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 263 | return -1; |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 264 | |
Holger Hans Peter Freyther | 10b2e7a | 2010-08-05 06:27:22 +0800 | [diff] [blame] | 265 | #warning "Slight spec violation. With connection mode recvonly we should attempt to forward." |
| 266 | |
| 267 | return rc; |
| 268 | } |
| 269 | |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 270 | static int rtp_data_net(struct bsc_fd *fd, unsigned int what) |
| 271 | { |
| 272 | char buf[4096]; |
| 273 | struct sockaddr_in addr; |
| 274 | struct mgcp_endpoint *endp; |
| 275 | int rc, proto; |
| 276 | |
| 277 | endp = (struct mgcp_endpoint *) fd->data; |
| 278 | |
| 279 | rc = recevice_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| 280 | if (rc <= 0) |
| 281 | return -1; |
| 282 | |
| 283 | if (memcmp(&addr.sin_addr, &endp->net_end.addr, sizeof(addr.sin_addr)) != 0) { |
| 284 | LOGP(DMGCP, LOGL_ERROR, |
| 285 | "Data from wrong address %s on 0x%x\n", |
| 286 | inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(endp)); |
| 287 | return -1; |
| 288 | } |
| 289 | |
| 290 | if (endp->net_end.rtp_port != addr.sin_port && |
| 291 | endp->net_end.rtcp_port != addr.sin_port) { |
| 292 | LOGP(DMGCP, LOGL_ERROR, |
| 293 | "Data from wrong source port %d on 0x%x\n", |
| 294 | ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| 295 | return -1; |
| 296 | } |
| 297 | |
| 298 | /* throw away the dummy message */ |
| 299 | if (rc == 1 && buf[0] == DUMMY_LOAD) { |
| 300 | LOGP(DMGCP, LOGL_NOTICE, "Filtered dummy from network on 0x%x\n", |
| 301 | ENDPOINT_NUMBER(endp)); |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | proto = fd == &endp->net_end.rtp ? PROTO_RTP : PROTO_RTCP; |
| 306 | endp->net_end.packets += 1; |
Holger Hans Peter Freyther | 8fdb95e | 2010-08-06 01:12:21 +0800 | [diff] [blame] | 307 | |
| 308 | forward_data(fd->fd, &endp->taps[MGCP_TAP_NET_IN], buf, rc); |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 309 | return send_to(endp, DEST_BTS, proto == PROTO_RTP, &addr, &buf[0], rc); |
| 310 | } |
| 311 | |
Holger Hans Peter Freyther | 6769ea0 | 2010-08-06 07:48:41 +0800 | [diff] [blame] | 312 | static void discover_bts(struct mgcp_endpoint *endp, int proto, struct sockaddr_in *addr) |
| 313 | { |
| 314 | struct mgcp_config *cfg = endp->cfg; |
| 315 | |
| 316 | if (proto == PROTO_RTP && endp->bts_end.rtp_port == 0) { |
| 317 | if (!cfg->bts_ip || |
| 318 | memcmp(&addr->sin_addr, |
| 319 | &cfg->bts_in, sizeof(cfg->bts_in)) == 0 || |
| 320 | memcmp(&addr->sin_addr, |
| 321 | &endp->bts_end.addr, sizeof(endp->bts_end.addr)) == 0) { |
| 322 | |
| 323 | endp->bts_end.rtp_port = addr->sin_port; |
| 324 | endp->bts_end.addr = addr->sin_addr; |
| 325 | |
| 326 | LOGP(DMGCP, LOGL_NOTICE, |
| 327 | "Found BTS for endpoint: 0x%x on port: %d/%d of %s\n", |
| 328 | ENDPOINT_NUMBER(endp), ntohs(endp->bts_end.rtp_port), |
| 329 | ntohs(endp->bts_end.rtcp_port), inet_ntoa(addr->sin_addr)); |
| 330 | } |
| 331 | } else if (proto == PROTO_RTCP && endp->bts_end.rtcp_port == 0) { |
| 332 | if (memcmp(&endp->bts_end.addr, &addr->sin_addr, |
| 333 | sizeof(endp->bts_end.addr)) == 0) { |
| 334 | endp->bts_end.rtcp_port = addr->sin_port; |
| 335 | } |
| 336 | } |
| 337 | } |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 338 | |
| 339 | static int rtp_data_bts(struct bsc_fd *fd, unsigned int what) |
Holger Hans Peter Freyther | 10b2e7a | 2010-08-05 06:27:22 +0800 | [diff] [blame] | 340 | { |
| 341 | char buf[4096]; |
| 342 | struct sockaddr_in addr; |
| 343 | struct mgcp_endpoint *endp; |
| 344 | struct mgcp_config *cfg; |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 345 | int rc, proto; |
Holger Hans Peter Freyther | 10b2e7a | 2010-08-05 06:27:22 +0800 | [diff] [blame] | 346 | |
| 347 | endp = (struct mgcp_endpoint *) fd->data; |
| 348 | cfg = endp->cfg; |
| 349 | |
| 350 | rc = recevice_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| 351 | if (rc <= 0) |
| 352 | return -1; |
| 353 | |
Holger Hans Peter Freyther | 29e0188 | 2010-08-06 07:39:26 +0800 | [diff] [blame] | 354 | proto = fd == &endp->bts_end.rtp ? PROTO_RTP : PROTO_RTCP; |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 355 | |
| 356 | /* We have no idea who called us, maybe it is the BTS. */ |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 357 | /* it was the BTS... */ |
Holger Hans Peter Freyther | 6769ea0 | 2010-08-06 07:48:41 +0800 | [diff] [blame] | 358 | discover_bts(endp, proto, &addr); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 359 | |
Holger Hans Peter Freyther | 935137c | 2010-08-05 10:53:26 +0000 | [diff] [blame] | 360 | if (memcmp(&endp->bts_end.addr, &addr.sin_addr, sizeof(addr.sin_addr)) != 0) { |
| 361 | LOGP(DMGCP, LOGL_ERROR, |
| 362 | "Data from wrong bts %s on 0x%x\n", |
| 363 | inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(endp)); |
| 364 | return -1; |
| 365 | } |
| 366 | |
| 367 | if (endp->bts_end.rtp_port != addr.sin_port && |
| 368 | endp->bts_end.rtcp_port != addr.sin_port) { |
| 369 | LOGP(DMGCP, LOGL_ERROR, |
| 370 | "Data from wrong bts source port %d on 0x%x\n", |
| 371 | ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| 372 | return -1; |
| 373 | } |
| 374 | |
Holger Hans Peter Freyther | 906ed10 | 2010-05-14 02:18:59 +0800 | [diff] [blame] | 375 | /* throw away the dummy message */ |
Holger Hans Peter Freyther | 040c130 | 2010-04-22 12:14:51 +0800 | [diff] [blame] | 376 | if (rc == 1 && buf[0] == DUMMY_LOAD) { |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 377 | LOGP(DMGCP, LOGL_NOTICE, "Filtered dummy from bts on 0x%x\n", |
Holger Hans Peter Freyther | 040c130 | 2010-04-22 12:14:51 +0800 | [diff] [blame] | 378 | ENDPOINT_NUMBER(endp)); |
| 379 | return 0; |
| 380 | } |
| 381 | |
Holger Hans Peter Freyther | 6de5b11 | 2010-04-07 09:37:17 +0200 | [diff] [blame] | 382 | /* do this before the loop handling */ |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 383 | endp->bts_end.packets += 1; |
Holger Hans Peter Freyther | 6de5b11 | 2010-04-07 09:37:17 +0200 | [diff] [blame] | 384 | |
Holger Hans Peter Freyther | 8fdb95e | 2010-08-06 01:12:21 +0800 | [diff] [blame] | 385 | forward_data(fd->fd, &endp->taps[MGCP_TAP_BTS_IN], buf, rc); |
Holger Hans Peter Freyther | 1d9a8eb | 2010-11-01 19:57:50 +0100 | [diff] [blame] | 386 | if (endp->is_transcoded) |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 387 | return send_transcoder(endp, proto == PROTO_RTP, &buf[0], rc); |
| 388 | else |
| 389 | return send_to(endp, DEST_NETWORK, proto == PROTO_RTP, &addr, &buf[0], rc); |
| 390 | } |
| 391 | |
| 392 | static int rtp_data_transcoder(struct bsc_fd *fd, unsigned int what) |
| 393 | { |
| 394 | char buf[4096]; |
| 395 | struct sockaddr_in addr; |
| 396 | struct mgcp_endpoint *endp; |
| 397 | struct mgcp_config *cfg; |
| 398 | int rc, proto; |
| 399 | |
| 400 | endp = (struct mgcp_endpoint *) fd->data; |
| 401 | cfg = endp->cfg; |
| 402 | |
| 403 | rc = recevice_from(endp, fd->fd, &addr, buf, sizeof(buf)); |
| 404 | if (rc <= 0) |
| 405 | return -1; |
| 406 | |
Holger Hans Peter Freyther | b6345ab | 2010-11-01 20:53:31 +0100 | [diff] [blame] | 407 | proto = fd == &endp->trans_net.rtp ? PROTO_RTP : PROTO_RTCP; |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 408 | |
| 409 | if (memcmp(&addr.sin_addr, &cfg->transcoder_in, sizeof(addr.sin_addr)) != 0) { |
| 410 | LOGP(DMGCP, LOGL_ERROR, |
| 411 | "Data not coming from transcoder: %s on 0x%x\n", |
| 412 | inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(endp)); |
| 413 | return -1; |
| 414 | } |
| 415 | |
Holger Hans Peter Freyther | b6345ab | 2010-11-01 20:53:31 +0100 | [diff] [blame] | 416 | if (endp->trans_net.rtp_port != addr.sin_port && |
| 417 | endp->trans_net.rtcp_port != addr.sin_port) { |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 418 | LOGP(DMGCP, LOGL_ERROR, |
| 419 | "Data from wrong transcoder source port %d on 0x%x\n", |
| 420 | ntohs(addr.sin_port), ENDPOINT_NUMBER(endp)); |
| 421 | return -1; |
| 422 | } |
| 423 | |
| 424 | /* throw away the dummy message */ |
| 425 | if (rc == 1 && buf[0] == DUMMY_LOAD) { |
| 426 | LOGP(DMGCP, LOGL_NOTICE, "Filtered dummy from transcoder on 0x%x\n", |
| 427 | ENDPOINT_NUMBER(endp)); |
| 428 | return 0; |
| 429 | } |
| 430 | |
Holger Hans Peter Freyther | b6345ab | 2010-11-01 20:53:31 +0100 | [diff] [blame] | 431 | endp->trans_net.packets += 1; |
Holger Hans Peter Freyther | 77eae16 | 2010-08-05 06:55:58 +0800 | [diff] [blame] | 432 | return send_to(endp, DEST_NETWORK, proto == PROTO_RTP, &addr, &buf[0], rc); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | static int create_bind(const char *source_addr, struct bsc_fd *fd, int port) |
| 436 | { |
| 437 | struct sockaddr_in addr; |
| 438 | int on = 1; |
| 439 | |
| 440 | fd->fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 441 | if (fd->fd < 0) { |
| 442 | LOGP(DMGCP, LOGL_ERROR, "Failed to create UDP port.\n"); |
| 443 | return -1; |
| 444 | } |
| 445 | |
| 446 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 447 | memset(&addr, 0, sizeof(addr)); |
| 448 | addr.sin_family = AF_INET; |
| 449 | addr.sin_port = htons(port); |
| 450 | inet_aton(source_addr, &addr.sin_addr); |
| 451 | |
| 452 | if (bind(fd->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
Holger Hans Peter Freyther | 1de4d84 | 2010-08-06 03:00:17 +0800 | [diff] [blame] | 453 | close(fd->fd); |
| 454 | fd->fd = -1; |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 455 | return -1; |
| 456 | } |
| 457 | |
| 458 | return 0; |
| 459 | } |
| 460 | |
Holger Hans Peter Freyther | 489d0a6 | 2010-05-31 10:22:00 +0800 | [diff] [blame] | 461 | static int set_ip_tos(int fd, int tos) |
| 462 | { |
| 463 | int ret; |
| 464 | ret = setsockopt(fd, IPPROTO_IP, IP_TOS, |
| 465 | &tos, sizeof(tos)); |
| 466 | return ret != 0; |
| 467 | } |
| 468 | |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 469 | static int bind_rtp(struct mgcp_config *cfg, struct mgcp_rtp_end *rtp_end, int endpno) |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 470 | { |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 471 | if (create_bind(cfg->source_addr, &rtp_end->rtp, rtp_end->local_port) != 0) { |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 472 | LOGP(DMGCP, LOGL_ERROR, "Failed to create RTP port: %s:%d on 0x%x\n", |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 473 | cfg->source_addr, rtp_end->local_port, endpno); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 474 | goto cleanup0; |
| 475 | } |
| 476 | |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 477 | if (create_bind(cfg->source_addr, &rtp_end->rtcp, rtp_end->local_port + 1) != 0) { |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 478 | LOGP(DMGCP, LOGL_ERROR, "Failed to create RTCP port: %s:%d on 0x%x\n", |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 479 | cfg->source_addr, rtp_end->local_port + 1, endpno); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 480 | goto cleanup1; |
| 481 | } |
| 482 | |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 483 | set_ip_tos(rtp_end->rtp.fd, cfg->endp_dscp); |
| 484 | set_ip_tos(rtp_end->rtcp.fd, cfg->endp_dscp); |
Holger Hans Peter Freyther | 489d0a6 | 2010-05-31 10:22:00 +0800 | [diff] [blame] | 485 | |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 486 | rtp_end->rtp.when = BSC_FD_READ; |
| 487 | if (bsc_register_fd(&rtp_end->rtp) != 0) { |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 488 | LOGP(DMGCP, LOGL_ERROR, "Failed to register RTP port %d on 0x%x\n", |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 489 | rtp_end->local_port, endpno); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 490 | goto cleanup2; |
| 491 | } |
| 492 | |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 493 | rtp_end->rtcp.when = BSC_FD_READ; |
| 494 | if (bsc_register_fd(&rtp_end->rtcp) != 0) { |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 495 | LOGP(DMGCP, LOGL_ERROR, "Failed to register RTCP port %d on 0x%x\n", |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 496 | rtp_end->local_port + 1, endpno); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 497 | goto cleanup3; |
| 498 | } |
| 499 | |
| 500 | return 0; |
| 501 | |
| 502 | cleanup3: |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 503 | bsc_unregister_fd(&rtp_end->rtp); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 504 | cleanup2: |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 505 | close(rtp_end->rtcp.fd); |
| 506 | rtp_end->rtcp.fd = -1; |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 507 | cleanup1: |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 508 | close(rtp_end->rtp.fd); |
| 509 | rtp_end->rtp.fd = -1; |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 510 | cleanup0: |
| 511 | return -1; |
| 512 | } |
| 513 | |
Holger Hans Peter Freyther | 18f6787 | 2010-11-01 21:15:22 +0100 | [diff] [blame^] | 514 | static int int_bind(const char *port, |
| 515 | struct mgcp_rtp_end *end, int (*cb)(struct bsc_fd *, unsigned), |
| 516 | struct mgcp_endpoint *_endp, int rtp_port) |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 517 | { |
Holger Hans Peter Freyther | 18f6787 | 2010-11-01 21:15:22 +0100 | [diff] [blame^] | 518 | if (end->rtp.fd != -1 || end->rtcp.fd != -1) { |
| 519 | LOGP(DMGCP, LOGL_ERROR, "Previous %s was still bound on %d\n", |
| 520 | port, ENDPOINT_NUMBER(_endp)); |
| 521 | mgcp_free_rtp_port(end); |
Holger Hans Peter Freyther | 6af36c0 | 2010-08-06 07:18:22 +0800 | [diff] [blame] | 522 | } |
| 523 | |
Holger Hans Peter Freyther | 18f6787 | 2010-11-01 21:15:22 +0100 | [diff] [blame^] | 524 | end->local_port = rtp_port; |
| 525 | end->rtp.cb = cb; |
| 526 | end->rtp.data = _endp; |
| 527 | end->rtcp.data = _endp; |
| 528 | end->rtcp.cb = cb; |
| 529 | return bind_rtp(_endp->cfg, end, ENDPOINT_NUMBER(_endp)); |
| 530 | } |
| 531 | |
| 532 | |
| 533 | int mgcp_bind_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 534 | { |
| 535 | return int_bind("bts-port", &endp->bts_end, |
| 536 | rtp_data_bts, endp, rtp_port); |
Holger Hans Peter Freyther | 81938e9 | 2010-08-05 04:10:21 +0800 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 540 | { |
Holger Hans Peter Freyther | 18f6787 | 2010-11-01 21:15:22 +0100 | [diff] [blame^] | 541 | return int_bind("net-port", &endp->net_end, |
| 542 | rtp_data_net, endp, rtp_port); |
Holger Hans Peter Freyther | 5ada53a | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 543 | } |
Holger Hans Peter Freyther | 05d8f5f | 2010-08-05 08:08:17 +0800 | [diff] [blame] | 544 | |
Holger Hans Peter Freyther | c983f83 | 2010-11-01 21:04:54 +0100 | [diff] [blame] | 545 | int mgcp_bind_trans_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 546 | { |
Holger Hans Peter Freyther | 18f6787 | 2010-11-01 21:15:22 +0100 | [diff] [blame^] | 547 | return int_bind("trans-net", &endp->trans_net, |
| 548 | rtp_data_transcoder, endp, rtp_port); |
Holger Hans Peter Freyther | 56ac269 | 2010-09-18 02:30:02 +0800 | [diff] [blame] | 549 | } |
| 550 | |
Holger Hans Peter Freyther | c983f83 | 2010-11-01 21:04:54 +0100 | [diff] [blame] | 551 | int mgcp_bind_trans_bts_rtp_port(struct mgcp_endpoint *endp, int rtp_port) |
| 552 | { |
Holger Hans Peter Freyther | 18f6787 | 2010-11-01 21:15:22 +0100 | [diff] [blame^] | 553 | return int_bind("trans-bts", &endp->trans_bts, |
| 554 | rtp_data_transcoder, endp, rtp_port); |
Holger Hans Peter Freyther | c983f83 | 2010-11-01 21:04:54 +0100 | [diff] [blame] | 555 | } |
| 556 | |
Holger Hans Peter Freyther | 05d8f5f | 2010-08-05 08:08:17 +0800 | [diff] [blame] | 557 | int mgcp_free_rtp_port(struct mgcp_rtp_end *end) |
| 558 | { |
Holger Hans Peter Freyther | 05d8f5f | 2010-08-05 08:08:17 +0800 | [diff] [blame] | 559 | if (end->rtp.fd != -1) { |
| 560 | close(end->rtp.fd); |
| 561 | end->rtp.fd = -1; |
| 562 | bsc_unregister_fd(&end->rtp); |
| 563 | } |
| 564 | |
| 565 | if (end->rtcp.fd != -1) { |
| 566 | close(end->rtcp.fd); |
| 567 | end->rtcp.fd = -1; |
| 568 | bsc_unregister_fd(&end->rtcp); |
| 569 | } |
| 570 | |
| 571 | return 0; |
| 572 | } |