Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 1 | /* RTP proxy handling for ip.access nanoBTS */ |
| 2 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 3 | /* (C) 2009-2013 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 4 | * All Rights Reserved |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 7 | * it under the terms of the GNU Affero General Public License as published by |
| 8 | * the Free Software Foundation; either version 3 of the License, or |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 14 | * GNU Affero General Public License for more details. |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 15 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 16 | * You should have received a copy of the GNU Affero General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <errno.h> |
| 22 | #include <unistd.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <netinet/in.h> |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 25 | #include <arpa/inet.h> |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 26 | #include <sys/time.h> /* gettimeofday() */ |
| 27 | #include <unistd.h> /* get..() */ |
| 28 | #include <time.h> /* clock() */ |
| 29 | #include <sys/utsname.h> /* uname() */ |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 30 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 31 | #include <osmocom/core/talloc.h> |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 32 | #include <osmocom/core/utils.h> |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 33 | #include <openbsc/gsm_data.h> |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 34 | #include <osmocom/core/msgb.h> |
| 35 | #include <osmocom/core/select.h> |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 36 | #include <openbsc/debug.h> |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 37 | #include <openbsc/rtp_proxy.h> |
Harald Welte | f142c97 | 2011-05-24 13:25:38 +0200 | [diff] [blame] | 38 | #include <openbsc/mncc.h> |
Alexander Huemer | 0a65461 | 2011-09-06 00:09:49 +0200 | [diff] [blame] | 39 | #include <openbsc/trau_upqueue.h> |
Holger Hans Peter Freyther | d0e171a | 2015-03-22 09:51:43 +0100 | [diff] [blame] | 40 | |
| 41 | #include <osmocom/netif/rtp.h> |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 42 | |
Holger Hans Peter Freyther | 3cb2879 | 2010-10-12 15:39:46 +0200 | [diff] [blame] | 43 | /* attempt to determine byte order */ |
Holger Hans Peter Freyther | 3cb2879 | 2010-10-12 15:39:46 +0200 | [diff] [blame] | 44 | #include <sys/param.h> |
| 45 | #include <limits.h> |
| 46 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 47 | static LLIST_HEAD(rtp_sockets); |
| 48 | |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 49 | /* should we mangle the CNAME inside SDES of RTCP packets? We disable |
| 50 | * this by default, as it seems to be not needed */ |
| 51 | static int mangle_rtcp_cname = 0; |
| 52 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 53 | enum rtp_bfd_priv { |
| 54 | RTP_PRIV_NONE, |
| 55 | RTP_PRIV_RTP, |
| 56 | RTP_PRIV_RTCP |
| 57 | }; |
| 58 | |
| 59 | #define RTP_ALLOC_SIZE 1500 |
| 60 | |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 61 | #define RTCP_TYPE_SDES 202 |
| 62 | |
| 63 | #define RTCP_IE_CNAME 1 |
| 64 | |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 65 | |
| 66 | #define RTP_VERSION 2 |
| 67 | |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 68 | /* 33 for FR, all other codecs have smaller size */ |
| 69 | #define MAX_RTP_PAYLOAD_LEN 33 |
| 70 | |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 71 | /* decode an rtp frame and create a new buffer with payload */ |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 72 | static int rtp_decode(struct msgb *msg, uint32_t callref, struct msgb **data) |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 73 | { |
| 74 | struct msgb *new_msg; |
| 75 | struct gsm_data_frame *frame; |
| 76 | struct rtp_hdr *rtph = (struct rtp_hdr *)msg->data; |
| 77 | struct rtp_x_hdr *rtpxh; |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 78 | uint8_t *payload, *payload_out; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 79 | int payload_len; |
| 80 | int msg_type; |
| 81 | int x_len; |
| 82 | |
| 83 | if (msg->len < 12) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 84 | DEBUGPC(DLMUX, "received RTP frame too short (len = %d)\n", |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 85 | msg->len); |
| 86 | return -EINVAL; |
| 87 | } |
| 88 | if (rtph->version != RTP_VERSION) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 89 | DEBUGPC(DLMUX, "received RTP version %d not supported.\n", |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 90 | rtph->version); |
| 91 | return -EINVAL; |
| 92 | } |
| 93 | payload = msg->data + sizeof(struct rtp_hdr) + (rtph->csrc_count << 2); |
| 94 | payload_len = msg->len - sizeof(struct rtp_hdr) - (rtph->csrc_count << 2); |
| 95 | if (payload_len < 0) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 96 | DEBUGPC(DLMUX, "received RTP frame too short (len = %d, " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 97 | "csrc count = %d)\n", msg->len, rtph->csrc_count); |
| 98 | return -EINVAL; |
| 99 | } |
| 100 | if (rtph->extension) { |
| 101 | if (payload_len < sizeof(struct rtp_x_hdr)) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 102 | DEBUGPC(DLMUX, "received RTP frame too short for " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 103 | "extension header\n"); |
| 104 | return -EINVAL; |
| 105 | } |
| 106 | rtpxh = (struct rtp_x_hdr *)payload; |
| 107 | x_len = ntohs(rtpxh->length) * 4 + sizeof(struct rtp_x_hdr); |
| 108 | payload += x_len; |
| 109 | payload_len -= x_len; |
| 110 | if (payload_len < 0) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 111 | DEBUGPC(DLMUX, "received RTP frame too short, " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 112 | "extension header exceeds frame length\n"); |
| 113 | return -EINVAL; |
| 114 | } |
| 115 | } |
| 116 | if (rtph->padding) { |
Jacob Erlbeck | d9e4039 | 2013-11-21 19:05:42 +0100 | [diff] [blame] | 117 | if (payload_len < 1) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 118 | DEBUGPC(DLMUX, "received RTP frame too short for " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 119 | "padding length\n"); |
| 120 | return -EINVAL; |
| 121 | } |
| 122 | payload_len -= payload[payload_len - 1]; |
| 123 | if (payload_len < 0) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 124 | DEBUGPC(DLMUX, "received RTP frame with padding " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 125 | "greater than payload\n"); |
| 126 | return -EINVAL; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | switch (rtph->payload_type) { |
| 131 | case RTP_PT_GSM_FULL: |
| 132 | msg_type = GSM_TCHF_FRAME; |
Andreas Eversberg | 88012b6 | 2014-01-22 10:05:51 +0100 | [diff] [blame] | 133 | if (payload_len != RTP_LEN_GSM_FULL) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 134 | DEBUGPC(DLMUX, "received RTP full rate frame with " |
Andreas Eversberg | 88012b6 | 2014-01-22 10:05:51 +0100 | [diff] [blame] | 135 | "payload length != %d (len = %d)\n", |
| 136 | RTP_LEN_GSM_FULL, payload_len); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 137 | return -EINVAL; |
| 138 | } |
| 139 | break; |
Harald Welte | aca8f15 | 2009-12-19 23:06:41 +0100 | [diff] [blame] | 140 | case RTP_PT_GSM_EFR: |
| 141 | msg_type = GSM_TCHF_FRAME_EFR; |
Andreas Eversberg | 88012b6 | 2014-01-22 10:05:51 +0100 | [diff] [blame] | 142 | if (payload_len != RTP_LEN_GSM_EFR) { |
| 143 | DEBUGPC(DLMUX, "received RTP extended full rate frame " |
| 144 | "with payload length != %d (len = %d)\n", |
| 145 | RTP_LEN_GSM_EFR, payload_len); |
| 146 | return -EINVAL; |
| 147 | } |
Harald Welte | aca8f15 | 2009-12-19 23:06:41 +0100 | [diff] [blame] | 148 | break; |
Andreas Eversberg | 63bfdd8 | 2014-01-17 19:06:38 +0100 | [diff] [blame] | 149 | case RTP_PT_GSM_HALF: |
| 150 | msg_type = GSM_TCHH_FRAME; |
| 151 | if (payload_len != RTP_LEN_GSM_HALF) { |
| 152 | DEBUGPC(DLMUX, "received RTP half rate frame with " |
| 153 | "payload length != %d (len = %d)\n", |
| 154 | RTP_LEN_GSM_HALF, payload_len); |
| 155 | return -EINVAL; |
| 156 | } |
| 157 | break; |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 158 | case RTP_PT_AMR: |
Harald Welte | ec75798 | 2014-05-18 18:32:05 +0200 | [diff] [blame] | 159 | msg_type = GSM_TCH_FRAME_AMR; |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 160 | break; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 161 | default: |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 162 | DEBUGPC(DLMUX, "received RTP frame with unknown payload " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 163 | "type %d\n", rtph->payload_type); |
| 164 | return -EINVAL; |
| 165 | } |
| 166 | |
Max | e152ffe | 2016-06-10 17:21:05 +0200 | [diff] [blame] | 167 | if (payload_len > MAX_RTP_PAYLOAD_LEN || |
| 168 | (rtph->payload_type == RTP_PT_AMR && |
| 169 | payload_len > MAX_RTP_PAYLOAD_LEN - 1)) { |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 170 | DEBUGPC(DLMUX, "RTP payload too large (%d octets)\n", |
| 171 | payload_len); |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 175 | /* always allocate for the maximum possible size to avoid |
| 176 | * fragmentation */ |
| 177 | new_msg = msgb_alloc(sizeof(struct gsm_data_frame) + |
Harald Welte | ed04fcc | 2015-12-28 21:03:10 +0100 | [diff] [blame] | 178 | MAX_RTP_PAYLOAD_LEN+1, "GSM-DATA (TCH)"); |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 179 | |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 180 | if (!new_msg) |
| 181 | return -ENOMEM; |
Holger Hans Peter Freyther | 652cdb4 | 2014-07-24 21:09:31 +0200 | [diff] [blame] | 182 | frame = (struct gsm_data_frame *) msgb_put(new_msg, sizeof(struct gsm_data_frame)); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 183 | frame->msg_type = msg_type; |
| 184 | frame->callref = callref; |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 185 | if (rtph->payload_type == RTP_PT_AMR) { |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 186 | /* for FR/HR/EFR the length is implicit. In AMR, we |
| 187 | * need to make it explicit by using the first byte of |
| 188 | * the data[] buffer as length byte */ |
| 189 | uint8_t *data0 = msgb_put(new_msg, 1); |
| 190 | *data0 = payload_len; |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 191 | } |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 192 | payload_out = msgb_put(new_msg, payload_len); |
| 193 | memcpy(payload_out, payload, payload_len); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 194 | |
| 195 | *data = new_msg; |
| 196 | return 0; |
| 197 | } |
| 198 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 199 | /*! \brief encode and send a rtp frame |
| 200 | * \param[in] rs RTP socket through which we shall send |
| 201 | * \param[in] frame GSM RTP frame to be sent |
| 202 | */ |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 203 | int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame) |
| 204 | { |
| 205 | struct rtp_sub_socket *rss = &rs->rtp; |
| 206 | struct msgb *msg; |
| 207 | struct rtp_hdr *rtph; |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 208 | uint8_t *payload; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 209 | int payload_type; |
| 210 | int payload_len; |
| 211 | int duration; /* in samples */ |
Andreas Eversberg | 9967a57 | 2012-01-20 20:33:37 +0100 | [diff] [blame] | 212 | int is_bfi = 0; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 213 | |
| 214 | if (rs->tx_action != RTP_SEND_DOWNSTREAM) { |
| 215 | /* initialize sequences */ |
| 216 | rs->tx_action = RTP_SEND_DOWNSTREAM; |
| 217 | rs->transmit.ssrc = rand(); |
| 218 | rs->transmit.sequence = random(); |
| 219 | rs->transmit.timestamp = random(); |
| 220 | } |
| 221 | |
| 222 | switch (frame->msg_type) { |
| 223 | case GSM_TCHF_FRAME: |
| 224 | payload_type = RTP_PT_GSM_FULL; |
Andreas Eversberg | 88012b6 | 2014-01-22 10:05:51 +0100 | [diff] [blame] | 225 | payload_len = RTP_LEN_GSM_FULL; |
| 226 | duration = RTP_GSM_DURATION; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 227 | break; |
Harald Welte | aca8f15 | 2009-12-19 23:06:41 +0100 | [diff] [blame] | 228 | case GSM_TCHF_FRAME_EFR: |
| 229 | payload_type = RTP_PT_GSM_EFR; |
Andreas Eversberg | 88012b6 | 2014-01-22 10:05:51 +0100 | [diff] [blame] | 230 | payload_len = RTP_LEN_GSM_EFR; |
| 231 | duration = RTP_GSM_DURATION; |
Harald Welte | aca8f15 | 2009-12-19 23:06:41 +0100 | [diff] [blame] | 232 | break; |
Andreas Eversberg | 63bfdd8 | 2014-01-17 19:06:38 +0100 | [diff] [blame] | 233 | case GSM_TCHH_FRAME: |
| 234 | payload_type = RTP_PT_GSM_HALF; |
| 235 | payload_len = RTP_LEN_GSM_HALF; |
| 236 | duration = RTP_GSM_DURATION; |
| 237 | break; |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 238 | case GSM_TCH_FRAME_AMR: |
| 239 | payload_type = RTP_PT_AMR; |
| 240 | payload_len = frame->data[0]; |
| 241 | duration = RTP_GSM_DURATION; |
| 242 | break; |
Andreas Eversberg | 9967a57 | 2012-01-20 20:33:37 +0100 | [diff] [blame] | 243 | case GSM_BAD_FRAME: |
| 244 | payload_type = 0; |
| 245 | payload_len = 0; |
| 246 | duration = RTP_GSM_DURATION; |
| 247 | is_bfi = 1; |
| 248 | break; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 249 | default: |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 250 | DEBUGPC(DLMUX, "unsupported message type %d\n", |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 251 | frame->msg_type); |
| 252 | return -EINVAL; |
| 253 | } |
| 254 | |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 255 | if (payload_len > MAX_RTP_PAYLOAD_LEN) { |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 256 | DEBUGPC(DLMUX, "RTP payload too large (%d octets)\n", |
| 257 | payload_len); |
| 258 | return -EINVAL; |
| 259 | } |
| 260 | |
Andreas Eversberg | 9967a57 | 2012-01-20 20:33:37 +0100 | [diff] [blame] | 261 | if (is_bfi) { |
| 262 | /* In case of a bad frame, just count and drop packet. */ |
| 263 | rs->transmit.timestamp += duration; |
| 264 | rs->transmit.sequence++; |
| 265 | return 0; |
| 266 | } |
| 267 | |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 268 | msg = msgb_alloc(sizeof(struct rtp_hdr) + payload_len, "RTP-GSM"); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 269 | if (!msg) |
| 270 | return -ENOMEM; |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 271 | rtph = (struct rtp_hdr *) msgb_put(msg, sizeof(struct rtp_hdr)); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 272 | rtph->version = RTP_VERSION; |
| 273 | rtph->padding = 0; |
| 274 | rtph->extension = 0; |
| 275 | rtph->csrc_count = 0; |
| 276 | rtph->marker = 0; |
| 277 | rtph->payload_type = payload_type; |
| 278 | rtph->sequence = htons(rs->transmit.sequence++); |
| 279 | rtph->timestamp = htonl(rs->transmit.timestamp); |
| 280 | rs->transmit.timestamp += duration; |
| 281 | rtph->ssrc = htonl(rs->transmit.ssrc); |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 282 | |
| 283 | payload = msgb_put(msg, payload_len); |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 284 | if (frame->msg_type == GSM_TCH_FRAME_AMR) |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 285 | memcpy(payload, frame->data + 1, payload_len); |
Andreas Eversberg | d8967f7 | 2012-03-08 14:39:19 +0100 | [diff] [blame] | 286 | else |
Harald Welte | a87f8f9 | 2014-05-17 13:43:01 +0200 | [diff] [blame] | 287 | memcpy(payload, frame->data, payload_len); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 288 | msgb_enqueue(&rss->tx_queue, msg); |
| 289 | rss->bfd.when |= BSC_FD_WRITE; |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
Holger Hans Peter Freyther | 89acf06 | 2009-07-29 06:46:26 +0200 | [diff] [blame] | 294 | /* iterate over all chunks in one RTCP message, look for CNAME IEs and |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 295 | * replace all of those with 'new_cname' */ |
| 296 | static int rtcp_sdes_cname_mangle(struct msgb *msg, struct rtcp_hdr *rh, |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 297 | uint16_t *rtcp_len, const char *new_cname) |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 298 | { |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 299 | uint8_t *rtcp_end; |
| 300 | uint8_t *cur = (uint8_t *) rh; |
| 301 | uint8_t tag, len = 0; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 302 | |
| 303 | rtcp_end = cur + *rtcp_len; |
| 304 | /* move cur to end of RTP header */ |
Harald Welte | 198f3f5 | 2009-07-29 10:46:41 +0200 | [diff] [blame] | 305 | cur += sizeof(*rh); |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 306 | |
| 307 | /* iterate over Chunks */ |
| 308 | while (cur+4 < rtcp_end) { |
| 309 | /* skip four bytes SSRC/CSRC */ |
| 310 | cur += 4; |
| 311 | |
| 312 | /* iterate over IE's inside the chunk */ |
| 313 | while (cur+1 < rtcp_end) { |
| 314 | tag = *cur++; |
| 315 | if (tag == 0) { |
| 316 | /* end of chunk, skip additional zero */ |
Daniel Willmann | 45fcb85 | 2014-05-21 15:46:43 +0200 | [diff] [blame] | 317 | while ((*cur++ == 0) && (cur < rtcp_end)) { } |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 318 | break; |
| 319 | } |
| 320 | len = *cur++; |
| 321 | |
| 322 | if (tag == RTCP_IE_CNAME) { |
| 323 | /* we've found the CNAME, lets mangle it */ |
| 324 | if (len < strlen(new_cname)) { |
| 325 | /* we need to make more space */ |
| 326 | int increase = strlen(new_cname) - len; |
| 327 | |
| 328 | msgb_push(msg, increase); |
| 329 | memmove(cur+len+increase, cur+len, |
| 330 | rtcp_end - (cur+len)); |
| 331 | /* FIXME: we have to respect RTCP |
| 332 | * padding/alignment rules! */ |
| 333 | len += increase; |
| 334 | *(cur-1) += increase; |
| 335 | rtcp_end += increase; |
| 336 | *rtcp_len += increase; |
| 337 | } |
| 338 | /* copy new CNAME into message */ |
| 339 | memcpy(cur, new_cname, strlen(new_cname)); |
| 340 | /* FIXME: zero the padding in case new CNAME |
| 341 | * is smaller than old one !!! */ |
| 342 | } |
| 343 | cur += len; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | static int rtcp_mangle(struct msgb *msg, struct rtp_socket *rs) |
| 351 | { |
| 352 | struct rtp_sub_socket *rss = &rs->rtcp; |
| 353 | struct rtcp_hdr *rtph; |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 354 | uint16_t old_len; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 355 | int rc; |
| 356 | |
| 357 | if (!mangle_rtcp_cname) |
| 358 | return 0; |
| 359 | |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 360 | printf("RTCP\n"); |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 361 | /* iterate over list of RTCP messages */ |
| 362 | rtph = (struct rtcp_hdr *)msg->data; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 363 | while ((void *)rtph + sizeof(*rtph) <= (void *)msg->data + msg->len) { |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 364 | old_len = (ntohs(rtph->length) + 1) * 4; |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 365 | if ((void *)rtph + old_len > (void *)msg->data + msg->len) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 366 | DEBUGPC(DLMUX, "received RTCP packet too short for " |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 367 | "length element\n"); |
| 368 | return -EINVAL; |
| 369 | } |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 370 | if (rtph->type == RTCP_TYPE_SDES) { |
| 371 | char new_cname[255]; |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 372 | osmo_strlcpy(new_cname, |
| 373 | inet_ntoa(rss->sin_local.sin_addr), |
| 374 | sizeof(new_cname)); |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 375 | rc = rtcp_sdes_cname_mangle(msg, rtph, &old_len, |
| 376 | new_cname); |
| 377 | if (rc < 0) |
| 378 | return rc; |
| 379 | } |
| 380 | rtph = (void *)rtph + old_len; |
| 381 | } |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 386 | /* read from incoming RTP/RTCP socket */ |
| 387 | static int rtp_socket_read(struct rtp_socket *rs, struct rtp_sub_socket *rss) |
| 388 | { |
| 389 | int rc; |
| 390 | struct msgb *msg = msgb_alloc(RTP_ALLOC_SIZE, "RTP/RTCP"); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 391 | struct msgb *new_msg; |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 392 | struct rtp_sub_socket *other_rss; |
| 393 | |
| 394 | if (!msg) |
| 395 | return -ENOMEM; |
| 396 | |
| 397 | rc = read(rss->bfd.fd, msg->data, RTP_ALLOC_SIZE); |
Andreas Eversberg | cf7557a | 2012-03-16 08:14:23 +0100 | [diff] [blame] | 398 | if (rc == 0) { |
| 399 | rss->bfd.when &= ~BSC_FD_READ; |
| 400 | goto out_free; |
| 401 | } else if (rc < 0) { |
| 402 | /* Ignore "connection refused". this happens, If we open the |
| 403 | * socket faster than the remote side. */ |
| 404 | if (errno == ECONNREFUSED) |
| 405 | goto out_free; |
| 406 | DEBUGPC(DLMUX, "Read of RTP socket (%p) failed (errno %d, " |
| 407 | "%s)\n", rs, errno, strerror(errno)); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 408 | rss->bfd.when &= ~BSC_FD_READ; |
Holger Hans Peter Freyther | 37b5ce5 | 2015-03-28 17:30:31 +0100 | [diff] [blame] | 409 | goto out_free; |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | msgb_put(msg, rc); |
| 413 | |
| 414 | switch (rs->rx_action) { |
| 415 | case RTP_PROXY: |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 416 | if (!rs->proxy.other_sock) { |
| 417 | rc = -EIO; |
| 418 | goto out_free; |
| 419 | } |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 420 | if (rss->bfd.priv_nr == RTP_PRIV_RTP) |
| 421 | other_rss = &rs->proxy.other_sock->rtp; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 422 | else if (rss->bfd.priv_nr == RTP_PRIV_RTCP) { |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 423 | other_rss = &rs->proxy.other_sock->rtcp; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 424 | /* modify RTCP SDES CNAME */ |
| 425 | rc = rtcp_mangle(msg, rs); |
| 426 | if (rc < 0) |
| 427 | goto out_free; |
| 428 | } else { |
| 429 | rc = -EINVAL; |
| 430 | goto out_free; |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 431 | } |
| 432 | msgb_enqueue(&other_rss->tx_queue, msg); |
| 433 | other_rss->bfd.when |= BSC_FD_WRITE; |
| 434 | break; |
Holger Hans Peter Freyther | 1ddb356 | 2009-08-10 07:57:13 +0200 | [diff] [blame] | 435 | |
| 436 | case RTP_RECV_UPSTREAM: |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 437 | if (!rs->receive.callref || !rs->receive.net) { |
| 438 | rc = -EIO; |
| 439 | goto out_free; |
| 440 | } |
| 441 | if (rss->bfd.priv_nr == RTP_PRIV_RTCP) { |
| 442 | if (!mangle_rtcp_cname) { |
| 443 | msgb_free(msg); |
| 444 | break; |
| 445 | } |
| 446 | /* modify RTCP SDES CNAME */ |
| 447 | rc = rtcp_mangle(msg, rs); |
| 448 | if (rc < 0) |
| 449 | goto out_free; |
| 450 | msgb_enqueue(&rss->tx_queue, msg); |
| 451 | rss->bfd.when |= BSC_FD_WRITE; |
| 452 | break; |
| 453 | } |
| 454 | if (rss->bfd.priv_nr != RTP_PRIV_RTP) { |
| 455 | rc = -EINVAL; |
| 456 | goto out_free; |
| 457 | } |
| 458 | rc = rtp_decode(msg, rs->receive.callref, &new_msg); |
| 459 | if (rc < 0) |
| 460 | goto out_free; |
| 461 | msgb_free(msg); |
Harald Welte | 31c00f7 | 2011-03-03 23:29:05 +0100 | [diff] [blame] | 462 | trau_tx_to_mncc(rs->receive.net, new_msg); |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 463 | break; |
| 464 | |
| 465 | case RTP_NONE: /* if socket exists, but disabled by app */ |
| 466 | msgb_free(msg); |
Holger Hans Peter Freyther | 1ddb356 | 2009-08-10 07:57:13 +0200 | [diff] [blame] | 467 | break; |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 468 | } |
| 469 | |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 470 | return 0; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 471 | |
| 472 | out_free: |
| 473 | msgb_free(msg); |
| 474 | return rc; |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 475 | } |
| 476 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 477 | /* \brief write from tx_queue to RTP/RTCP socket */ |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 478 | static int rtp_socket_write(struct rtp_socket *rs, struct rtp_sub_socket *rss) |
| 479 | { |
| 480 | struct msgb *msg; |
| 481 | int written; |
| 482 | |
| 483 | msg = msgb_dequeue(&rss->tx_queue); |
| 484 | if (!msg) { |
| 485 | rss->bfd.when &= ~BSC_FD_WRITE; |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | written = write(rss->bfd.fd, msg->data, msg->len); |
| 490 | if (written < msg->len) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 491 | LOGP(DLMIB, LOGL_ERROR, "short write"); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 492 | msgb_free(msg); |
| 493 | return -EIO; |
| 494 | } |
| 495 | |
| 496 | msgb_free(msg); |
| 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 502 | /*! \brief callback for the select.c:bfd_* layer */ |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 503 | static int rtp_bfd_cb(struct osmo_fd *bfd, unsigned int flags) |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 504 | { |
| 505 | struct rtp_socket *rs = bfd->data; |
| 506 | struct rtp_sub_socket *rss; |
| 507 | |
| 508 | switch (bfd->priv_nr) { |
| 509 | case RTP_PRIV_RTP: |
| 510 | rss = &rs->rtp; |
| 511 | break; |
| 512 | case RTP_PRIV_RTCP: |
| 513 | rss = &rs->rtcp; |
| 514 | break; |
| 515 | default: |
| 516 | return -EINVAL; |
| 517 | } |
| 518 | |
| 519 | if (flags & BSC_FD_READ) |
| 520 | rtp_socket_read(rs, rss); |
| 521 | |
| 522 | if (flags & BSC_FD_WRITE) |
| 523 | rtp_socket_write(rs, rss); |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 528 | /*! \brief initialize one rtp sub-socket */ |
Holger Hans Peter Freyther | acf8a0c | 2010-03-29 08:47:44 +0200 | [diff] [blame] | 529 | static void init_rss(struct rtp_sub_socket *rss, |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 530 | struct rtp_socket *rs, int fd, int priv_nr) |
| 531 | { |
| 532 | /* initialize bfd */ |
| 533 | rss->bfd.fd = fd; |
| 534 | rss->bfd.data = rs; |
| 535 | rss->bfd.priv_nr = priv_nr; |
| 536 | rss->bfd.cb = rtp_bfd_cb; |
| 537 | } |
| 538 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 539 | /*! \brief create a new RTP/RTCP socket and bind it */ |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 540 | struct rtp_socket *rtp_socket_create(void) |
| 541 | { |
| 542 | int rc; |
| 543 | struct rtp_socket *rs; |
| 544 | |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 545 | DEBUGP(DLMUX, "rtp_socket_create(): "); |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 546 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 547 | rs = talloc_zero(tall_bsc_ctx, struct rtp_socket); |
| 548 | if (!rs) |
| 549 | return NULL; |
| 550 | |
| 551 | INIT_LLIST_HEAD(&rs->rtp.tx_queue); |
| 552 | INIT_LLIST_HEAD(&rs->rtcp.tx_queue); |
| 553 | |
| 554 | rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 555 | if (rc < 0) |
| 556 | goto out_free; |
| 557 | |
| 558 | init_rss(&rs->rtp, rs, rc, RTP_PRIV_RTP); |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 559 | rc = osmo_fd_register(&rs->rtp.bfd); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 560 | if (rc < 0) |
| 561 | goto out_rtp_socket; |
| 562 | |
| 563 | rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 564 | if (rc < 0) |
| 565 | goto out_rtp_bfd; |
| 566 | |
| 567 | init_rss(&rs->rtcp, rs, rc, RTP_PRIV_RTCP); |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 568 | rc = osmo_fd_register(&rs->rtcp.bfd); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 569 | if (rc < 0) |
| 570 | goto out_rtcp_socket; |
| 571 | |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 572 | DEBUGPC(DLMUX, "success\n"); |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 573 | |
| 574 | rc = rtp_socket_bind(rs, INADDR_ANY); |
| 575 | if (rc < 0) |
| 576 | goto out_rtcp_bfd; |
| 577 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 578 | return rs; |
| 579 | |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 580 | out_rtcp_bfd: |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 581 | osmo_fd_unregister(&rs->rtcp.bfd); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 582 | out_rtcp_socket: |
| 583 | close(rs->rtcp.bfd.fd); |
| 584 | out_rtp_bfd: |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 585 | osmo_fd_unregister(&rs->rtp.bfd); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 586 | out_rtp_socket: |
| 587 | close(rs->rtp.bfd.fd); |
| 588 | out_free: |
| 589 | talloc_free(rs); |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 590 | DEBUGPC(DLMUX, "failed\n"); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 591 | return NULL; |
| 592 | } |
| 593 | |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 594 | static int rtp_sub_socket_bind(struct rtp_sub_socket *rss, uint32_t ip, |
| 595 | uint16_t port) |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 596 | { |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 597 | int rc; |
| 598 | socklen_t alen = sizeof(rss->sin_local); |
| 599 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 600 | rss->sin_local.sin_family = AF_INET; |
| 601 | rss->sin_local.sin_addr.s_addr = htonl(ip); |
| 602 | rss->sin_local.sin_port = htons(port); |
| 603 | rss->bfd.when |= BSC_FD_READ; |
| 604 | |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 605 | rc = bind(rss->bfd.fd, (struct sockaddr *)&rss->sin_local, |
| 606 | sizeof(rss->sin_local)); |
| 607 | if (rc < 0) |
| 608 | return rc; |
| 609 | |
| 610 | /* retrieve the address we actually bound to, in case we |
| 611 | * passed INADDR_ANY as IP address */ |
| 612 | return getsockname(rss->bfd.fd, (struct sockaddr *)&rss->sin_local, |
| 613 | &alen); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | #define RTP_PORT_BASE 30000 |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 617 | static unsigned int next_udp_port = RTP_PORT_BASE; |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 618 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 619 | /*! \brief bind a RTP socket to a specific local address |
| 620 | * \param[in] rs RTP socket to be bound |
| 621 | * \param[in] ip local IP address to which socket is to be bound |
| 622 | */ |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 623 | int rtp_socket_bind(struct rtp_socket *rs, uint32_t ip) |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 624 | { |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 625 | int rc = -EIO; |
| 626 | struct in_addr ia; |
| 627 | |
| 628 | ia.s_addr = htonl(ip); |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 629 | DEBUGP(DLMUX, "rtp_socket_bind(rs=%p, IP=%s): ", rs, |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 630 | inet_ntoa(ia)); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 631 | |
| 632 | /* try to bind to a consecutive pair of ports */ |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 633 | for (next_udp_port = next_udp_port % 0xffff; |
| 634 | next_udp_port < 0xffff; next_udp_port += 2) { |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 635 | rc = rtp_sub_socket_bind(&rs->rtp, ip, next_udp_port); |
| 636 | if (rc != 0) |
| 637 | continue; |
| 638 | |
| 639 | rc = rtp_sub_socket_bind(&rs->rtcp, ip, next_udp_port+1); |
| 640 | if (rc == 0) |
| 641 | break; |
| 642 | } |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 643 | if (rc < 0) { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 644 | DEBUGPC(DLMUX, "failed\n"); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 645 | return rc; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 646 | } |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 647 | |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 648 | ia.s_addr = rs->rtp.sin_local.sin_addr.s_addr; |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 649 | DEBUGPC(DLMUX, "BOUND_IP=%s, BOUND_PORT=%u\n", |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 650 | inet_ntoa(ia), ntohs(rs->rtp.sin_local.sin_port)); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 651 | return ntohs(rs->rtp.sin_local.sin_port); |
| 652 | } |
| 653 | |
| 654 | static int rtp_sub_socket_connect(struct rtp_sub_socket *rss, |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 655 | uint32_t ip, uint16_t port) |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 656 | { |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 657 | int rc; |
| 658 | socklen_t alen = sizeof(rss->sin_local); |
| 659 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 660 | rss->sin_remote.sin_family = AF_INET; |
| 661 | rss->sin_remote.sin_addr.s_addr = htonl(ip); |
| 662 | rss->sin_remote.sin_port = htons(port); |
| 663 | |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 664 | rc = connect(rss->bfd.fd, (struct sockaddr *) &rss->sin_remote, |
| 665 | sizeof(rss->sin_remote)); |
| 666 | if (rc < 0) |
| 667 | return rc; |
| 668 | |
| 669 | return getsockname(rss->bfd.fd, (struct sockaddr *)&rss->sin_local, |
| 670 | &alen); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 671 | } |
| 672 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 673 | /*! \brief 'connect' a RTP socket to a remote peer |
| 674 | * \param[in] rs RTP socket to be connected |
| 675 | * \param[in] ip remote IP address to which to connect |
| 676 | * \param[in] port remote UDP port number to which to connect |
| 677 | */ |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 678 | int rtp_socket_connect(struct rtp_socket *rs, uint32_t ip, uint16_t port) |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 679 | { |
| 680 | int rc; |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 681 | struct in_addr ia; |
| 682 | |
| 683 | ia.s_addr = htonl(ip); |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 684 | DEBUGP(DLMUX, "rtp_socket_connect(rs=%p, ip=%s, port=%u)\n", |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 685 | rs, inet_ntoa(ia), port); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 686 | |
| 687 | rc = rtp_sub_socket_connect(&rs->rtp, ip, port); |
| 688 | if (rc < 0) |
| 689 | return rc; |
| 690 | |
| 691 | return rtp_sub_socket_connect(&rs->rtcp, ip, port+1); |
| 692 | } |
| 693 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 694 | /*! \brief bind two RTP/RTCP sockets together in the proxy |
| 695 | * \param[in] this First RTP socket |
| 696 | * \param[in] other Second RTP socket |
| 697 | */ |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 698 | int rtp_socket_proxy(struct rtp_socket *this, struct rtp_socket *other) |
| 699 | { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 700 | DEBUGP(DLMUX, "rtp_socket_proxy(this=%p, other=%p)\n", |
Harald Welte | 805f644 | 2009-07-28 18:25:29 +0200 | [diff] [blame] | 701 | this, other); |
| 702 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 703 | this->rx_action = RTP_PROXY; |
| 704 | this->proxy.other_sock = other; |
| 705 | |
| 706 | other->rx_action = RTP_PROXY; |
| 707 | other->proxy.other_sock = this; |
| 708 | |
| 709 | return 0; |
| 710 | } |
| 711 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 712 | /*! \brief bind RTP/RTCP socket to application, disabling proxy |
| 713 | * \param[in] this RTP socket |
| 714 | * \param[in] net gsm_network argument to trau_tx_to_mncc() |
| 715 | * \param[in] callref callref argument to trau_tx_to_mncc() |
| 716 | */ |
Harald Welte | 9fb1f10 | 2009-12-20 17:07:23 +0100 | [diff] [blame] | 717 | int rtp_socket_upstream(struct rtp_socket *this, struct gsm_network *net, |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 718 | uint32_t callref) |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 719 | { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 720 | DEBUGP(DLMUX, "rtp_socket_proxy(this=%p, callref=%u)\n", |
Harald Welte | da7ab74 | 2009-12-19 22:23:05 +0100 | [diff] [blame] | 721 | this, callref); |
| 722 | |
| 723 | if (callref) { |
| 724 | this->rx_action = RTP_RECV_UPSTREAM; |
| 725 | this->receive.net = net; |
| 726 | this->receive.callref = callref; |
| 727 | } else |
| 728 | this->rx_action = RTP_NONE; |
| 729 | |
| 730 | return 0; |
| 731 | } |
| 732 | |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 733 | static void free_tx_queue(struct rtp_sub_socket *rss) |
| 734 | { |
| 735 | struct msgb *msg; |
| 736 | |
| 737 | while ((msg = msgb_dequeue(&rss->tx_queue))) |
| 738 | msgb_free(msg); |
| 739 | } |
| 740 | |
Harald Welte | 647db84 | 2013-02-03 12:06:58 +0100 | [diff] [blame] | 741 | /*! \brief Free/release a previously allocated RTP socket |
| 742 | * \param[in[] rs RTP/RTCP socket to be released |
| 743 | */ |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 744 | int rtp_socket_free(struct rtp_socket *rs) |
| 745 | { |
Pablo Neira Ayuso | ed5cacb | 2011-08-17 22:44:07 +0200 | [diff] [blame] | 746 | DEBUGP(DLMUX, "rtp_socket_free(rs=%p)\n", rs); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 747 | |
| 748 | /* make sure we don't leave references dangling to us */ |
| 749 | if (rs->rx_action == RTP_PROXY && |
| 750 | rs->proxy.other_sock) |
| 751 | rs->proxy.other_sock->proxy.other_sock = NULL; |
| 752 | |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 753 | osmo_fd_unregister(&rs->rtp.bfd); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 754 | close(rs->rtp.bfd.fd); |
| 755 | free_tx_queue(&rs->rtp); |
| 756 | |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 757 | osmo_fd_unregister(&rs->rtcp.bfd); |
Harald Welte | ead7a7b | 2009-07-28 00:01:58 +0200 | [diff] [blame] | 758 | close(rs->rtcp.bfd.fd); |
| 759 | free_tx_queue(&rs->rtcp); |
| 760 | |
| 761 | talloc_free(rs); |
| 762 | |
| 763 | return 0; |
| 764 | } |