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