| 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.
|
|---|
| 13 | * 3. All advertising materials mentioning features or use of this software
|
|---|
| 14 | * must display the following acknowledgement:
|
|---|
| 15 | * This product includes software developed by the University of
|
|---|
| 16 | * California, Berkeley and its contributors.
|
|---|
| 17 | * 4. Neither the name of the University nor the names of its contributors
|
|---|
| 18 | * may be used to endorse or promote products derived from this software
|
|---|
| 19 | * without specific prior written permission.
|
|---|
| 20 | *
|
|---|
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 31 | * SUCH DAMAGE.
|
|---|
| 32 | *
|
|---|
| 33 | * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
|
|---|
| 34 | * ip_output.c,v 1.9 1994/11/16 10:17:10 jkh Exp
|
|---|
| 35 | */
|
|---|
| 36 |
|
|---|
| 37 | /*
|
|---|
| 38 | * Changes and additions relating to SLiRP are
|
|---|
| 39 | * Copyright (c) 1995 Danny Gasparovski.
|
|---|
| 40 | *
|
|---|
| 41 | * Please read the file COPYRIGHT for the
|
|---|
| 42 | * terms and conditions of the copyright.
|
|---|
| 43 | */
|
|---|
| 44 |
|
|---|
| 45 | #include <slirp.h>
|
|---|
| 46 | #include "alias.h"
|
|---|
| 47 |
|
|---|
| 48 | static const uint8_t broadcast_ethaddr[6] =
|
|---|
| 49 | {
|
|---|
| 50 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
|
|---|
| 51 | };
|
|---|
| 52 |
|
|---|
| 53 | static int rt_lookup_in_cache(PNATState pData, uint32_t dst, uint8_t *ether)
|
|---|
| 54 | {
|
|---|
| 55 | int rc;
|
|---|
| 56 | if (dst == INADDR_BROADCAST)
|
|---|
| 57 | {
|
|---|
| 58 | memcpy(ether, broadcast_ethaddr, ETH_ALEN);
|
|---|
| 59 | return VINF_SUCCESS;
|
|---|
| 60 | }
|
|---|
| 61 |
|
|---|
| 62 | rc = slirp_arp_lookup_ether_by_ip(pData, dst, ether);
|
|---|
| 63 | if (RT_SUCCESS(rc))
|
|---|
| 64 | return rc;
|
|---|
| 65 |
|
|---|
| 66 | rc = bootp_cache_lookup_ether_by_ip(pData, dst, ether);
|
|---|
| 67 | if (RT_SUCCESS(rc))
|
|---|
| 68 | return rc;
|
|---|
| 69 | /*
|
|---|
| 70 | * no chance to send this packet, sorry, we will request ether address via ARP
|
|---|
| 71 | */
|
|---|
| 72 | slirp_arp_who_has(pData, dst);
|
|---|
| 73 | return VERR_NOT_FOUND;
|
|---|
| 74 | }
|
|---|
| 75 |
|
|---|
| 76 | /*
|
|---|
| 77 | * IP output. The packet in mbuf chain m contains a skeletal IP
|
|---|
| 78 | * header (with len, off, ttl, proto, tos, src, dst).
|
|---|
| 79 | * The mbuf chain containing the packet will be freed.
|
|---|
| 80 | * The mbuf opt, if present, will not be freed.
|
|---|
| 81 | */
|
|---|
| 82 | int
|
|---|
| 83 | ip_output(PNATState pData, struct socket *so, struct mbuf *m0)
|
|---|
| 84 | {
|
|---|
| 85 | return ip_output0(pData, so, m0, 0);
|
|---|
| 86 | }
|
|---|
| 87 |
|
|---|
| 88 | int
|
|---|
| 89 | ip_output0(PNATState pData, struct socket *so, struct mbuf *m0, int urg)
|
|---|
| 90 | {
|
|---|
| 91 | register struct ip *ip;
|
|---|
| 92 | register struct mbuf *m = m0;
|
|---|
| 93 | register int hlen = sizeof(struct ip );
|
|---|
| 94 | int len, off, error = 0;
|
|---|
| 95 | extern uint8_t zerro_ethaddr[ETH_ALEN];
|
|---|
| 96 | struct ethhdr *eh = NULL;
|
|---|
| 97 | uint8_t eth_dst[ETH_ALEN];
|
|---|
| 98 | int rc = 1;
|
|---|
| 99 |
|
|---|
| 100 | STAM_PROFILE_START(&pData->StatIP_output, a);
|
|---|
| 101 |
|
|---|
| 102 | DEBUG_CALL("ip_output");
|
|---|
| 103 | DEBUG_ARG("so = %lx", (long)so);
|
|---|
| 104 | DEBUG_ARG("m0 = %lx", (long)m0);
|
|---|
| 105 |
|
|---|
| 106 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 107 | if(m->m_data != (MBUF_HEAD(m) + if_maxlinkhdr))
|
|---|
| 108 | {
|
|---|
| 109 | LogRel(("NAT: ethernet detects corruption of the packet"));
|
|---|
| 110 | AssertMsgFailed(("!!Ethernet frame corrupted!!"));
|
|---|
| 111 | }
|
|---|
| 112 | #else
|
|---|
| 113 | M_ASSERTPKTHDR(m);
|
|---|
| 114 | Assert(m->m_pkthdr.header);
|
|---|
| 115 | #endif
|
|---|
| 116 |
|
|---|
| 117 | #if 0 /* We do no options */
|
|---|
| 118 | if (opt)
|
|---|
| 119 | {
|
|---|
| 120 | m = ip_insertoptions(m, opt, &len);
|
|---|
| 121 | hlen = len;
|
|---|
| 122 | }
|
|---|
| 123 | #endif
|
|---|
| 124 | ip = mtod(m, struct ip *);
|
|---|
| 125 | /*
|
|---|
| 126 | * Fill in IP header.
|
|---|
| 127 | */
|
|---|
| 128 | ip->ip_v = IPVERSION;
|
|---|
| 129 | ip->ip_off &= IP_DF;
|
|---|
| 130 | ip->ip_id = RT_H2N_U16(ip_currid++);
|
|---|
| 131 | ip->ip_hl = hlen >> 2;
|
|---|
| 132 | ipstat.ips_localout++;
|
|---|
| 133 |
|
|---|
| 134 | /*
|
|---|
| 135 | * Verify that we have any chance at all of being able to queue
|
|---|
| 136 | * the packet or packet fragments
|
|---|
| 137 | */
|
|---|
| 138 | #if 0 /* XXX Hmmm... */
|
|---|
| 139 | if (if_queued > if_thresh && towrite <= 0)
|
|---|
| 140 | {
|
|---|
| 141 | error = ENOBUFS;
|
|---|
| 142 | goto exit_drop_package;
|
|---|
| 143 | }
|
|---|
| 144 | #endif
|
|---|
| 145 | /* Current TCP/IP stack hasn't routing information at
|
|---|
| 146 | * all so we need to calculate destination ethernet address
|
|---|
| 147 | */
|
|---|
| 148 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 149 | eh = (struct ethhdr *)MBUF_HEAD(m);
|
|---|
| 150 | if (memcmp(eh->h_source, zerro_ethaddr, ETH_ALEN) == 0)
|
|---|
| 151 | {
|
|---|
| 152 | rc = rt_lookup_in_cache(pData, ip->ip_dst.s_addr, eth_dst);
|
|---|
| 153 | if (RT_FAILURE(rc))
|
|---|
| 154 | goto exit_drop_package;
|
|---|
| 155 | }
|
|---|
| 156 | else
|
|---|
| 157 | {
|
|---|
| 158 | memcpy(eth_dst, eh->h_source, ETH_ALEN);
|
|---|
| 159 | rc = 0; /*some times we've already know where to send packet*/
|
|---|
| 160 | }
|
|---|
| 161 | #else
|
|---|
| 162 | /*
|
|---|
| 163 | * (vvl) Assumption is that m_data points at the IP header and only
|
|---|
| 164 | * in case of dhcp we know and have header before IP.
|
|---|
| 165 | */
|
|---|
| 166 | rc = rt_lookup_in_cache(pData, ip->ip_dst.s_addr, eth_dst);
|
|---|
| 167 | if (RT_FAILURE(rc))
|
|---|
| 168 | goto exit_drop_package;
|
|---|
| 169 |
|
|---|
| 170 | eh = (struct ethhdr *)(m->m_data - ETH_HLEN);
|
|---|
| 171 | #endif
|
|---|
| 172 | /*
|
|---|
| 173 | * If small enough for interface, can just send directly.
|
|---|
| 174 | */
|
|---|
| 175 | if ((u_int16_t)ip->ip_len <= if_mtu)
|
|---|
| 176 | {
|
|---|
| 177 | ip->ip_len = RT_H2N_U16((u_int16_t)ip->ip_len);
|
|---|
| 178 | ip->ip_off = RT_H2N_U16((u_int16_t)ip->ip_off);
|
|---|
| 179 | ip->ip_sum = 0;
|
|---|
| 180 | ip->ip_sum = cksum(m, hlen);
|
|---|
| 181 |
|
|---|
| 182 | {
|
|---|
| 183 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 184 | STAM_PROFILE_START(&pData->StatALIAS_output, b);
|
|---|
| 185 | rc = LibAliasOut((m->m_la ? m->m_la : pData->proxy_alias),
|
|---|
| 186 | mtod(m, char *), m->m_len);
|
|---|
| 187 | Log2(("NAT: LibAlias return %d\n", rc));
|
|---|
| 188 | #else
|
|---|
| 189 | struct m_tag *t;
|
|---|
| 190 | STAM_PROFILE_START(&pData->StatALIAS_output, b);
|
|---|
| 191 | if ((t = m_tag_find(m, PACKET_TAG_ALIAS, NULL)) != 0)
|
|---|
| 192 | rc = LibAliasOut((struct libalias *)&t[1], mtod(m, char *),
|
|---|
| 193 | m_length(m, NULL));
|
|---|
| 194 | else
|
|---|
| 195 | rc = LibAliasOut(pData->proxy_alias, mtod(m, char *),
|
|---|
| 196 | m_length(m, NULL));
|
|---|
| 197 |
|
|---|
| 198 | if (rc == PKT_ALIAS_IGNORED)
|
|---|
| 199 | {
|
|---|
| 200 | Log(("NAT: packet was droppped\n"));
|
|---|
| 201 | goto exit_drop_package;
|
|---|
| 202 | }
|
|---|
| 203 | #endif
|
|---|
| 204 | STAM_PROFILE_STOP(&pData->StatALIAS_output, b);
|
|---|
| 205 | }
|
|---|
| 206 |
|
|---|
| 207 | memcpy(eh->h_source, eth_dst, ETH_ALEN);
|
|---|
| 208 |
|
|---|
| 209 | if_encap(pData, ETH_P_IP, m, urg? ETH_ENCAP_URG : 0);
|
|---|
| 210 | goto done;
|
|---|
| 211 | }
|
|---|
| 212 |
|
|---|
| 213 | /*
|
|---|
| 214 | * Too large for interface; fragment if possible.
|
|---|
| 215 | * Must be able to put at least 8 bytes per fragment.
|
|---|
| 216 | */
|
|---|
| 217 | if (ip->ip_off & IP_DF)
|
|---|
| 218 | {
|
|---|
| 219 | error = -1;
|
|---|
| 220 | ipstat.ips_cantfrag++;
|
|---|
| 221 | goto exit_drop_package;
|
|---|
| 222 | }
|
|---|
| 223 |
|
|---|
| 224 | len = (if_mtu - hlen) &~ 7; /* ip databytes per packet */
|
|---|
| 225 | if (len < 8)
|
|---|
| 226 | {
|
|---|
| 227 | error = -1;
|
|---|
| 228 | goto exit_drop_package;
|
|---|
| 229 | }
|
|---|
| 230 |
|
|---|
| 231 | {
|
|---|
| 232 | int mhlen, firstlen = len;
|
|---|
| 233 | struct mbuf **mnext = &m->m_nextpkt;
|
|---|
| 234 | #ifdef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 235 | char *buf; /* intermediate buffer we'll use for copy from orriginal packet */
|
|---|
| 236 | #endif
|
|---|
| 237 | {
|
|---|
| 238 | #ifdef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 239 | struct m_tag *t;
|
|---|
| 240 | char *tmpbuf = NULL;
|
|---|
| 241 | int tmplen = 0;
|
|---|
| 242 | #endif
|
|---|
| 243 | int rcLa;
|
|---|
| 244 | HTONS(ip->ip_len);
|
|---|
| 245 | HTONS(ip->ip_off);
|
|---|
| 246 | ip->ip_sum = 0;
|
|---|
| 247 | ip->ip_sum = cksum(m, hlen);
|
|---|
| 248 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 249 | rcLa = LibAliasOut((m->m_la ? m->m_la : pData->proxy_alias),
|
|---|
| 250 | mtod(m, char *), m->m_len);
|
|---|
| 251 | #else
|
|---|
| 252 | if (m->m_next != NULL)
|
|---|
| 253 | {
|
|---|
| 254 | /*we've receives packet in fragments*/
|
|---|
| 255 | tmplen = m_length(m, NULL);
|
|---|
| 256 | tmpbuf = RTMemAlloc(tmplen);
|
|---|
| 257 | Assert(tmpbuf);
|
|---|
| 258 | m_copydata(m, 0, tmplen, tmpbuf);
|
|---|
| 259 | }
|
|---|
| 260 | else
|
|---|
| 261 | {
|
|---|
| 262 | tmpbuf = mtod(m, char *);
|
|---|
| 263 | tmplen = m_length(m, NULL);
|
|---|
| 264 |
|
|---|
| 265 | }
|
|---|
| 266 |
|
|---|
| 267 | if ((t = m_tag_find(m, PACKET_TAG_ALIAS, NULL)) != 0)
|
|---|
| 268 | rcLa = LibAliasOut((struct libalias *)&t[1], tmpbuf, tmplen);
|
|---|
| 269 | else
|
|---|
| 270 | rcLa = LibAliasOut(pData->proxy_alias, tmpbuf, tmplen);
|
|---|
| 271 |
|
|---|
| 272 | if (m->m_next != NULL)
|
|---|
| 273 | {
|
|---|
| 274 | if (rcLa != PKT_ALIAS_IGNORED)
|
|---|
| 275 | {
|
|---|
| 276 | struct ip *tmpip = (struct ip *)tmpbuf;
|
|---|
| 277 | m_copyback(pData, m, 0, RT_N2H_U16(tmpip->ip_len) + (tmpip->ip_hl << 2), tmpbuf);
|
|---|
| 278 | }
|
|---|
| 279 | if (tmpbuf != NULL)
|
|---|
| 280 | RTMemFree(tmpbuf);
|
|---|
| 281 | }
|
|---|
| 282 | if (rcLa == PKT_ALIAS_IGNORED)
|
|---|
| 283 | {
|
|---|
| 284 | Log(("NAT: packet was droppped\n"));
|
|---|
| 285 | goto exit_drop_package;
|
|---|
| 286 | }
|
|---|
| 287 | #endif
|
|---|
| 288 | NTOHS(ip->ip_len);
|
|---|
| 289 | NTOHS(ip->ip_off);
|
|---|
| 290 | Log2(("NAT: LibAlias return %d\n", rcLa));
|
|---|
| 291 | }
|
|---|
| 292 |
|
|---|
| 293 | /*
|
|---|
| 294 | * Loop through length of segment after first fragment,
|
|---|
| 295 | * make new header and copy data of each part and link onto chain.
|
|---|
| 296 | */
|
|---|
| 297 | m0 = m;
|
|---|
| 298 | mhlen = sizeof (struct ip);
|
|---|
| 299 | for (off = hlen + len; off < (u_int16_t)ip->ip_len; off += len)
|
|---|
| 300 | {
|
|---|
| 301 | register struct ip *mhip;
|
|---|
| 302 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 303 | m = m_get(pData);
|
|---|
| 304 | #else
|
|---|
| 305 | m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
|
|---|
| 306 | #endif
|
|---|
| 307 | if (m == 0)
|
|---|
| 308 | {
|
|---|
| 309 | error = -1;
|
|---|
| 310 | ipstat.ips_odropped++;
|
|---|
| 311 | goto sendorfree;
|
|---|
| 312 | }
|
|---|
| 313 | m->m_data += if_maxlinkhdr;
|
|---|
| 314 | mhip = mtod(m, struct ip *);
|
|---|
| 315 | *mhip = *ip;
|
|---|
| 316 | m->m_len += ip->ip_hl << 2;
|
|---|
| 317 | #ifdef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 318 | m->m_pkthdr.header = mtod(m, void *);
|
|---|
| 319 | #endif
|
|---|
| 320 | /* we've calculated eth_dst for first packet */
|
|---|
| 321 | #if 0 /* No options */
|
|---|
| 322 | if (hlen > sizeof (struct ip))
|
|---|
| 323 | {
|
|---|
| 324 | mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
|---|
| 325 | mhip->ip_hl = mhlen >> 2;
|
|---|
| 326 | }
|
|---|
| 327 | #endif
|
|---|
| 328 | mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
|
|---|
| 329 | if (ip->ip_off & IP_MF)
|
|---|
| 330 | mhip->ip_off |= IP_MF;
|
|---|
| 331 | if (off + len >= (u_int16_t)ip->ip_len)
|
|---|
| 332 | len = (u_int16_t)ip->ip_len - off;
|
|---|
| 333 | else
|
|---|
| 334 | mhip->ip_off |= IP_MF;
|
|---|
| 335 | mhip->ip_len = RT_H2N_U16((u_int16_t)(len + mhlen));
|
|---|
| 336 |
|
|---|
| 337 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 338 | if (m_copy(m, m0, off, len) < 0)
|
|---|
| 339 | {
|
|---|
| 340 | error = -1;
|
|---|
| 341 | goto sendorfree;
|
|---|
| 342 | }
|
|---|
| 343 | #else
|
|---|
| 344 | buf = RTMemAlloc(len);
|
|---|
| 345 | m_copydata(m0, off, len, buf); /* copy to buffer */
|
|---|
| 346 | m->m_data += mhlen;
|
|---|
| 347 | m_copyback(pData, m, 0, len, buf); /* copy from buffer */
|
|---|
| 348 | m->m_data -= mhlen;
|
|---|
| 349 | m->m_len += mhlen;
|
|---|
| 350 | RTMemFree(buf);
|
|---|
| 351 | m->m_len += RT_N2H_U16(mhip->ip_len);
|
|---|
| 352 | #endif
|
|---|
| 353 |
|
|---|
| 354 | mhip->ip_off = RT_H2N_U16((u_int16_t)mhip->ip_off);
|
|---|
| 355 | mhip->ip_sum = 0;
|
|---|
| 356 | mhip->ip_sum = cksum(m, mhlen);
|
|---|
| 357 | *mnext = m;
|
|---|
| 358 | mnext = &m->m_nextpkt;
|
|---|
| 359 | ipstat.ips_ofragments++;
|
|---|
| 360 | }
|
|---|
| 361 | /*
|
|---|
| 362 | * Update first fragment by trimming what's been copied out
|
|---|
| 363 | * and updating header, then send each fragment (in order).
|
|---|
| 364 | */
|
|---|
| 365 | m = m0;
|
|---|
| 366 | m_adj(m, hlen + firstlen - (u_int16_t)ip->ip_len);
|
|---|
| 367 | ip->ip_len = RT_H2N_U16((u_int16_t)m->m_len);
|
|---|
| 368 | ip->ip_off = RT_H2N_U16((u_int16_t)(ip->ip_off | IP_MF));
|
|---|
| 369 | ip->ip_sum = 0;
|
|---|
| 370 | ip->ip_sum = cksum(m, hlen);
|
|---|
| 371 |
|
|---|
| 372 | sendorfree:
|
|---|
| 373 | for (m = m0; m; m = m0)
|
|---|
| 374 | {
|
|---|
| 375 | m0 = m->m_nextpkt;
|
|---|
| 376 | m->m_nextpkt = 0;
|
|---|
| 377 | if (error == 0)
|
|---|
| 378 | {
|
|---|
| 379 | #ifndef VBOX_WITH_SLIRP_BSD_MBUF
|
|---|
| 380 | eh = (struct ethhdr *)MBUF_HEAD(m);
|
|---|
| 381 | #else
|
|---|
| 382 | m->m_data -= ETH_HLEN;
|
|---|
| 383 | eh = mtod(m, struct ethhdr *);
|
|---|
| 384 | m->m_data += ETH_HLEN;
|
|---|
| 385 | #endif
|
|---|
| 386 | memcpy(eh->h_source, eth_dst, ETH_ALEN);
|
|---|
| 387 |
|
|---|
| 388 | if_encap(pData, ETH_P_IP, m, 0);
|
|---|
| 389 | }
|
|---|
| 390 | else
|
|---|
| 391 | {
|
|---|
| 392 | m_freem(pData, m);
|
|---|
| 393 | }
|
|---|
| 394 | }
|
|---|
| 395 |
|
|---|
| 396 | if (error == 0)
|
|---|
| 397 | ipstat.ips_fragmented++;
|
|---|
| 398 | }
|
|---|
| 399 |
|
|---|
| 400 | done:
|
|---|
| 401 | STAM_PROFILE_STOP(&pData->StatIP_output, a);
|
|---|
| 402 | return error;
|
|---|
| 403 |
|
|---|
| 404 | exit_drop_package:
|
|---|
| 405 | m_freem(pData, m0);
|
|---|
| 406 | STAM_PROFILE_STOP(&pData->StatIP_output, a);
|
|---|
| 407 | return error;
|
|---|
| 408 | }
|
|---|
