The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 13 | * 3. Neither the name of the University nor the names of its contributors |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 |
| 30 | * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Changes and additions relating to SLiRP |
| 35 | * Copyright (c) 1995 Danny Gasparovski. |
| 36 | * |
| 37 | * Please read the file COPYRIGHT for the |
| 38 | * terms and conditions of the copyright. |
| 39 | */ |
| 40 | |
| 41 | #include <slirp.h> |
| 42 | #include "ip_icmp.h" |
| 43 | #define SLIRP_COMPILATION 1 |
| 44 | #include "sockets.h" |
| 45 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 46 | #ifdef LOG_ENABLED |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 47 | struct udpstat udpstat; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 48 | #endif |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 49 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 50 | /* Keeps track of the number of DNS requests. Used to implement the firewall |
| 51 | * option that restricts the number of DNS requests (-max_dns_conns). */ |
| 52 | u_int dns_num_conns; |
| 53 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 54 | struct socket udb; |
| 55 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 56 | static u_int8_t udp_tos(struct socket *so); |
| 57 | static void udp_emu(struct socket *so, struct mbuf *m); |
| 58 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 59 | /* |
| 60 | * UDP protocol implementation. |
| 61 | * Per RFC 768, August, 1980. |
| 62 | */ |
| 63 | #ifndef COMPAT_42 |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 64 | #define UDPCKSUM 1 |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 65 | #else |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 66 | #define UDPCKSUM 0 /* XXX */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 67 | #endif |
| 68 | |
| 69 | struct socket *udp_last_so = &udb; |
| 70 | |
| 71 | void |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 72 | udp_init(void) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 73 | { |
| 74 | udb.so_next = udb.so_prev = &udb; |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 75 | dns_num_conns = 0; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 76 | } |
| 77 | /* m->m_data points at ip packet header |
| 78 | * m->m_len length ip packet |
| 79 | * ip->ip_len length data (IPDU) |
| 80 | */ |
| 81 | void |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 82 | udp_input(register struct mbuf *m, int iphlen) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 83 | { |
| 84 | register struct ip *ip; |
| 85 | register struct udphdr *uh; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 86 | /* struct mbuf *opts = 0;*/ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 87 | int len; |
| 88 | struct ip save_ip; |
| 89 | struct socket *so; |
| 90 | |
| 91 | DEBUG_CALL("udp_input"); |
| 92 | DEBUG_ARG("m = %lx", (long)m); |
| 93 | DEBUG_ARG("iphlen = %d", iphlen); |
| 94 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 95 | STAT(udpstat.udps_ipackets++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 96 | |
| 97 | /* |
| 98 | * Strip IP options, if any; should skip this, |
| 99 | * make available to user, and use on returned packets, |
| 100 | * but we don't yet have a way to check the checksum |
| 101 | * with options still present. |
| 102 | */ |
| 103 | if(iphlen > sizeof(struct ip)) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 104 | ip_stripoptions(m, (struct mbuf *)0); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 105 | iphlen = sizeof(struct ip); |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Get IP and UDP header together in first mbuf. |
| 110 | */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 111 | ip = mtod(m, struct ip *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 112 | uh = (struct udphdr *)((caddr_t)ip + iphlen); |
| 113 | |
| 114 | /* |
| 115 | * Make mbuf data length reflect UDP length. |
| 116 | * If not enough data to reflect UDP length, drop. |
| 117 | */ |
| 118 | len = ntohs((u_int16_t)uh->uh_ulen); |
| 119 | |
| 120 | if (ip->ip_len != len) { |
| 121 | if (len > ip->ip_len) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 122 | STAT(udpstat.udps_badlen++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 123 | goto bad; |
| 124 | } |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 125 | m_adj(m, len - ip->ip_len); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 126 | ip->ip_len = len; |
| 127 | } |
| 128 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 129 | /* ------------------------------------------------------*/ |
| 130 | /* User mode network stack restrictions */ |
| 131 | /* slirp_should_drop requires host byte ordering in arguments */ |
rich cannings | d952f28 | 2011-03-01 15:40:09 -0800 | [diff] [blame] | 132 | time_t timestamp = time(NULL); |
| 133 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 134 | if (slirp_should_drop(ntohl(ip->ip_dst.addr), ntohs(uh->uh_dport.port), |
| 135 | IPPROTO_UDP)) { |
| 136 | slirp_drop_log( |
rich cannings | d952f28 | 2011-03-01 15:40:09 -0800 | [diff] [blame] | 137 | "Dropped UDP: src: 0x%08lx:0x%04x dst: 0x%08lx:0x%04x %ld\n", |
| 138 | ntohl(ip->ip_src.addr), |
| 139 | ntohs(uh->uh_sport.port), |
| 140 | ntohl(ip->ip_dst.addr), |
| 141 | ntohs(uh->uh_dport.port), |
| 142 | timestamp |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 143 | ); |
| 144 | goto bad; /* drop the packet */ |
| 145 | } |
| 146 | else { |
| 147 | slirp_drop_log( |
rich cannings | d952f28 | 2011-03-01 15:40:09 -0800 | [diff] [blame] | 148 | "Allowed UDP: src: 0x%08lx:0x%04x dst: 0x%08lx:0x%04x %ld\n", |
| 149 | ntohl(ip->ip_src.addr), |
| 150 | ntohs(uh->uh_sport.port), |
| 151 | ntohl(ip->ip_dst.addr), |
| 152 | ntohs(uh->uh_dport.port), |
| 153 | timestamp |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 154 | ); |
| 155 | } |
| 156 | /* ------------------------------------------------------*/ |
| 157 | |
| 158 | |
| 159 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 160 | /* |
| 161 | * Save a copy of the IP header in case we want restore it |
| 162 | * for sending an ICMP error message in response. |
| 163 | */ |
| 164 | save_ip = *ip; |
| 165 | save_ip.ip_len+= iphlen; /* tcp_input subtracts this */ |
| 166 | |
| 167 | /* |
| 168 | * Checksum extended UDP header and data. |
| 169 | */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 170 | if (UDPCKSUM && uh->uh_sum) { |
| 171 | memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr)); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 172 | ((struct ipovly *)ip)->ih_x1 = 0; |
| 173 | ((struct ipovly *)ip)->ih_len = uh->uh_ulen; |
| 174 | /* keep uh_sum for ICMP reply |
| 175 | * uh->uh_sum = cksum(m, len + sizeof (struct ip)); |
| 176 | * if (uh->uh_sum) { |
| 177 | */ |
| 178 | if(cksum(m, len + sizeof(struct ip))) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 179 | STAT(udpstat.udps_badsum++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 180 | goto bad; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * handle DHCP/BOOTP |
| 186 | */ |
| 187 | if (port_geth(uh->uh_dport) == BOOTP_SERVER) { |
| 188 | bootp_input(m); |
| 189 | goto bad; |
| 190 | } |
| 191 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 192 | if (slirp_restrict) |
| 193 | goto bad; |
| 194 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 195 | /* |
| 196 | * handle TFTP |
| 197 | */ |
| 198 | if (port_geth(uh->uh_dport) == TFTP_SERVER) { |
| 199 | tftp_input(m); |
| 200 | goto bad; |
| 201 | } |
| 202 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 203 | // DNS logging and FW rules |
| 204 | if (ntohs(uh->uh_dport.port) == 53) { |
| 205 | if (!slirp_dump_dns(m)) { |
| 206 | DEBUG_MISC((dfd,"Error logging DNS packet")); |
| 207 | } |
| 208 | dns_num_conns++; |
| 209 | if (slirp_get_max_dns_conns() != -1 && |
| 210 | dns_num_conns > slirp_get_max_dns_conns()) |
| 211 | goto bad; |
| 212 | } |
| 213 | |
| 214 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 215 | /* |
| 216 | * Locate pcb for datagram. |
| 217 | */ |
| 218 | so = udp_last_so; |
| 219 | if (so->so_laddr_port != port_geth(uh->uh_sport) || |
| 220 | so->so_laddr_ip != ip_geth(ip->ip_src)) { |
| 221 | struct socket *tmp; |
| 222 | |
| 223 | for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) { |
| 224 | if (tmp->so_laddr_port == port_geth(uh->uh_sport) && |
| 225 | tmp->so_laddr_ip == ip_geth(ip->ip_src)) { |
| 226 | tmp->so_faddr_ip = ip_geth(ip->ip_dst); |
| 227 | tmp->so_faddr_port = port_geth(uh->uh_dport); |
| 228 | so = tmp; |
| 229 | break; |
| 230 | } |
| 231 | } |
| 232 | if (tmp == &udb) { |
| 233 | so = NULL; |
| 234 | } else { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 235 | STAT(udpstat.udpps_pcbcachemiss++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 236 | udp_last_so = so; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | if (so == NULL) { |
| 241 | /* |
| 242 | * If there's no socket for this packet, |
| 243 | * create one |
| 244 | */ |
| 245 | if ((so = socreate()) == NULL) goto bad; |
| 246 | if(udp_attach(so) == -1) { |
| 247 | DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", |
| 248 | errno,errno_str)); |
| 249 | sofree(so); |
| 250 | goto bad; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Setup fields |
| 255 | */ |
| 256 | /* udp_last_so = so; */ |
| 257 | so->so_laddr_ip = ip_geth(ip->ip_src); |
| 258 | so->so_laddr_port = port_geth(uh->uh_sport); |
| 259 | |
| 260 | if ((so->so_iptos = udp_tos(so)) == 0) |
| 261 | so->so_iptos = ip->ip_tos; |
| 262 | |
| 263 | /* |
| 264 | * XXXXX Here, check if it's in udpexec_list, |
| 265 | * and if it is, do the fork_exec() etc. |
| 266 | */ |
| 267 | } |
| 268 | |
| 269 | so->so_faddr_ip = ip_geth(ip->ip_dst); /* XXX */ |
| 270 | so->so_faddr_port = port_geth(uh->uh_dport); /* XXX */ |
| 271 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 272 | iphlen += sizeof(struct udphdr); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 273 | m->m_len -= iphlen; |
| 274 | m->m_data += iphlen; |
| 275 | |
| 276 | /* |
| 277 | * Now we sendto() the packet. |
| 278 | */ |
| 279 | if (so->so_emu) |
| 280 | udp_emu(so, m); |
| 281 | |
| 282 | if(sosendto(so,m) == -1) { |
| 283 | m->m_len += iphlen; |
| 284 | m->m_data -= iphlen; |
| 285 | *ip=save_ip; |
| 286 | DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno, errno_str)); |
| 287 | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,errno_str); |
| 288 | } |
| 289 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 290 | m_free(so->so_m); /* used for ICMP if error on sorecvfrom */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 291 | |
| 292 | /* restore the orig mbuf packet */ |
| 293 | m->m_len += iphlen; |
| 294 | m->m_data -= iphlen; |
| 295 | *ip=save_ip; |
| 296 | so->so_m=m; /* ICMP backup */ |
| 297 | |
| 298 | return; |
| 299 | bad: |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 300 | m_freem(m); |
| 301 | /* if (opts) m_freem(opts); */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 302 | return; |
| 303 | } |
| 304 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 305 | int udp_output2_(struct socket *so, struct mbuf *m, |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 306 | const SockAddress* saddr, |
| 307 | const SockAddress* daddr, |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 308 | int iptos) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 309 | { |
| 310 | register struct udpiphdr *ui; |
| 311 | uint32_t saddr_ip = sock_address_get_ip(saddr); |
| 312 | uint32_t daddr_ip = sock_address_get_ip(daddr); |
| 313 | int saddr_port = sock_address_get_port(saddr); |
| 314 | int daddr_port = sock_address_get_port(daddr); |
| 315 | int error = 0; |
| 316 | |
| 317 | DEBUG_CALL("udp_output"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 318 | DEBUG_ARG("so = %lx", (long)so); |
| 319 | DEBUG_ARG("m = %lx", (long)m); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 320 | DEBUG_ARG("saddr = %lx", (long) saddr_ip); |
| 321 | DEBUG_ARG("daddr = %lx", (long) daddr_ip); |
| 322 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 323 | /* |
| 324 | * Adjust for header |
| 325 | */ |
| 326 | m->m_data -= sizeof(struct udpiphdr); |
| 327 | m->m_len += sizeof(struct udpiphdr); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 328 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 329 | /* |
| 330 | * Fill in mbuf with extended UDP header |
| 331 | * and addresses and length put into network format. |
| 332 | */ |
| 333 | ui = mtod(m, struct udpiphdr *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 334 | memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr)); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 335 | ui->ui_x1 = 0; |
| 336 | ui->ui_pr = IPPROTO_UDP; |
| 337 | ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */ |
| 338 | /* XXXXX Check for from-one-location sockets, or from-any-location sockets */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 339 | ui->ui_src = ip_seth(saddr_ip); |
| 340 | ui->ui_dst = ip_seth(daddr_ip); |
| 341 | ui->ui_sport = port_seth(saddr_port); |
| 342 | ui->ui_dport = port_seth(daddr_port); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 343 | ui->ui_ulen = ui->ui_len; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 344 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 345 | /* |
| 346 | * Stuff checksum and output datagram. |
| 347 | */ |
| 348 | ui->ui_sum = 0; |
| 349 | if (UDPCKSUM) { |
| 350 | if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0) |
| 351 | ui->ui_sum = 0xffff; |
| 352 | } |
| 353 | ((struct ip *)ui)->ip_len = m->m_len; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 354 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 355 | ((struct ip *)ui)->ip_ttl = IPDEFTTL; |
| 356 | ((struct ip *)ui)->ip_tos = iptos; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 357 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 358 | STAT(udpstat.udps_opackets++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 359 | |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 360 | // DNS logging |
rich cannings | d952f28 | 2011-03-01 15:40:09 -0800 | [diff] [blame] | 361 | if (so != NULL && so->so_faddr_port == 53) { /*so has host byte order */ |
rich cannings | 7339b55 | 2011-02-16 13:43:44 -0800 | [diff] [blame] | 362 | if (!slirp_dump_dns(m)) { |
| 363 | DEBUG_MISC((dfd,"Error logging DNS packet")); |
| 364 | } |
| 365 | } |
| 366 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 367 | error = ip_output(so, m); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 368 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 369 | return (error); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 370 | } |
| 371 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 372 | int udp_output_(struct socket *so, struct mbuf *m, |
| 373 | SockAddress* from) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 374 | { |
| 375 | SockAddress saddr, daddr; |
| 376 | uint32_t saddr_ip; |
| 377 | uint16_t saddr_port; |
| 378 | |
| 379 | saddr_ip = sock_address_get_ip(from); |
| 380 | saddr_port = sock_address_get_port(from); |
| 381 | |
| 382 | if ((so->so_faddr_ip & 0xffffff00) == special_addr_ip) { |
| 383 | saddr_ip = so->so_faddr_ip; |
| 384 | if ((so->so_faddr_ip & 0x000000ff) == 0xff) |
| 385 | saddr_ip = alias_addr_ip; |
| 386 | } |
| 387 | |
| 388 | sock_address_init_inet( &saddr, saddr_ip, saddr_port ); |
| 389 | sock_address_init_inet( &daddr, so->so_laddr_ip, so->so_laddr_port ); |
| 390 | |
| 391 | return udp_output2_(so, m, &saddr, &daddr, so->so_iptos); |
| 392 | } |
| 393 | |
| 394 | int |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 395 | udp_attach(struct socket *so) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 396 | { |
| 397 | so->s = socket_anyaddr_server( 0, SOCKET_DGRAM ); |
| 398 | if (so->s != -1) { |
| 399 | /* success, insert in queue */ |
| 400 | so->so_expire = curtime + SO_EXPIRE; |
| 401 | insque(so,&udb); |
| 402 | } |
| 403 | return(so->s); |
| 404 | } |
| 405 | |
| 406 | void |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 407 | udp_detach(struct socket *so) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 408 | { |
| 409 | socket_close(so->s); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 410 | /* if (so->so_m) m_free(so->so_m); done by sofree */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 411 | |
| 412 | sofree(so); |
| 413 | } |
| 414 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 415 | static const struct tos_t udptos[] = { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 416 | {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ |
| 417 | {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ |
| 418 | {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ |
| 419 | {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ |
| 420 | {0, 0, 0, 0} |
| 421 | }; |
| 422 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 423 | static u_int8_t |
| 424 | udp_tos(struct socket *so) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 425 | { |
| 426 | int i = 0; |
| 427 | |
| 428 | while(udptos[i].tos) { |
| 429 | if ((udptos[i].fport && so->so_faddr_port == udptos[i].fport) || |
| 430 | (udptos[i].lport && so->so_laddr_port == udptos[i].lport)) { |
| 431 | so->so_emu = udptos[i].emu; |
| 432 | return udptos[i].tos; |
| 433 | } |
| 434 | i++; |
| 435 | } |
| 436 | |
| 437 | return 0; |
| 438 | } |
| 439 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 440 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 441 | /* |
| 442 | * Here, talk/ytalk/ntalk requests must be emulated |
| 443 | */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 444 | static void |
| 445 | udp_emu(struct socket *so, struct mbuf *m) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 446 | { |
| 447 | SockAddress sockaddr; |
| 448 | |
| 449 | struct cu_header { |
| 450 | uint16_t d_family; // destination family |
| 451 | uint16_t d_port; // destination port |
| 452 | uint32_t d_addr; // destination address |
| 453 | uint16_t s_family; // source family |
| 454 | uint16_t s_port; // source port |
| 455 | uint32_t so_addr; // source address |
| 456 | uint32_t seqn; // sequence number |
| 457 | uint16_t message; // message |
| 458 | uint16_t data_type; // data type |
| 459 | uint16_t pkt_len; // packet length |
| 460 | } *cu_head; |
| 461 | |
| 462 | switch(so->so_emu) { |
| 463 | |
| 464 | case EMU_CUSEEME: |
| 465 | |
| 466 | /* |
| 467 | * Cu-SeeMe emulation. |
| 468 | * Hopefully the packet is more that 16 bytes long. We don't |
| 469 | * do any other tests, just replace the address and port |
| 470 | * fields. |
| 471 | */ |
| 472 | if (m->m_len >= sizeof (*cu_head)) { |
| 473 | if (socket_get_address(so->s, &sockaddr) < 0) |
| 474 | return; |
| 475 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 476 | cu_head = mtod(m, struct cu_header *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 477 | cu_head->s_port = htons( sock_address_get_port(&sockaddr)); |
| 478 | cu_head->so_addr = htonl( sock_address_get_ip(&sockaddr)); |
| 479 | } |
| 480 | |
| 481 | return; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | struct socket * |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 486 | udp_listen(u_int port, u_int32_t laddr, u_int lport, int flags) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 487 | { |
| 488 | struct socket *so; |
| 489 | SockAddress addr; |
| 490 | uint32_t addr_ip; |
| 491 | |
| 492 | if ((so = socreate()) == NULL) { |
| 493 | free(so); |
| 494 | return NULL; |
| 495 | } |
| 496 | so->s = socket_anyaddr_server( port, SOCKET_DGRAM ); |
| 497 | so->so_expire = curtime + SO_EXPIRE; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 498 | so->so_haddr_port = port; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 499 | insque(so,&udb); |
| 500 | |
| 501 | if (so->s < 0) { |
| 502 | udp_detach(so); |
| 503 | return NULL; |
| 504 | } |
| 505 | |
| 506 | socket_get_address(so->s, &addr); |
| 507 | |
| 508 | so->so_faddr_port = sock_address_get_port(&addr); |
| 509 | addr_ip = sock_address_get_ip(&addr); |
| 510 | |
| 511 | if (addr_ip == 0 || addr_ip == loopback_addr_ip) |
| 512 | so->so_faddr_ip = alias_addr_ip; |
| 513 | else |
| 514 | so->so_faddr_ip = addr_ip; |
| 515 | |
| 516 | so->so_laddr_port = lport; |
| 517 | so->so_laddr_ip = laddr; |
| 518 | if (flags != SS_FACCEPTONCE) |
| 519 | so->so_expire = 0; |
| 520 | |
| 521 | so->so_state = SS_ISFCONNECTED; |
| 522 | |
| 523 | return so; |
| 524 | } |
| 525 | |
| 526 | int udp_unlisten (u_int port) |
| 527 | { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 528 | return slirp_unredir(1, port); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 529 | } |