1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1995 Søren Schmidt
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 /* XXX we use functions that might not exist. */
33 #include "opt_compat.h"
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/proc.h>
38 #include <sys/systm.h>
39 #include <sys/sysproto.h>
40 #include <sys/capsicum.h>
41 #include <sys/fcntl.h>
42 #include <sys/file.h>
43 #include <sys/filedesc.h>
44 #include <sys/limits.h>
45 #include <sys/lock.h>
46 #include <sys/malloc.h>
47 #include <sys/mutex.h>
48 #include <sys/mbuf.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/syscallsubr.h>
52 #include <sys/uio.h>
53 #include <sys/stat.h>
54 #include <sys/syslog.h>
55 #include <sys/un.h>
56 #include <sys/unistd.h>
57
58 #include <security/audit/audit.h>
59
60 #include <net/if.h>
61 #include <net/vnet.h>
62 #include <netinet/in.h>
63 #include <netinet/in_systm.h>
64 #include <netinet/ip.h>
65 #include <netinet/tcp.h>
66 #ifdef INET6
67 #include <netinet/ip6.h>
68 #include <netinet6/ip6_var.h>
69 #endif
70
71 #ifdef COMPAT_LINUX32
72 #include <machine/../linux32/linux.h>
73 #include <machine/../linux32/linux32_proto.h>
74 #else
75 #include <machine/../linux/linux.h>
76 #include <machine/../linux/linux_proto.h>
77 #endif
78 #include <compat/linux/linux_common.h>
79 #include <compat/linux/linux_file.h>
80 #include <compat/linux/linux_mib.h>
81 #include <compat/linux/linux_socket.h>
82 #include <compat/linux/linux_timer.h>
83 #include <compat/linux/linux_util.h>
84
85 static int linux_sendmsg_common(struct thread *, l_int, struct l_msghdr *,
86 l_uint);
87 static int linux_recvmsg_common(struct thread *, l_int, struct l_msghdr *,
88 l_uint, struct msghdr *);
89 static int linux_set_socket_flags(int, int *);
90
91 static int
92 linux_to_bsd_sockopt_level(int level)
93 {
94
95 if (level == LINUX_SOL_SOCKET)
96 return (SOL_SOCKET);
97 /* Remaining values are RFC-defined protocol numbers. */
98 return (level);
99 }
100
101 static int
102 bsd_to_linux_sockopt_level(int level)
103 {
104
105 if (level == SOL_SOCKET)
106 return (LINUX_SOL_SOCKET);
107 return (level);
108 }
109
110 static int
111 linux_to_bsd_ip_sockopt(int opt)
112 {
113
114 switch (opt) {
115 /* known and translated sockopts */
116 case LINUX_IP_TOS:
117 return (IP_TOS);
118 case LINUX_IP_TTL:
119 return (IP_TTL);
120 case LINUX_IP_HDRINCL:
121 return (IP_HDRINCL);
122 case LINUX_IP_OPTIONS:
123 return (IP_OPTIONS);
124 case LINUX_IP_RECVOPTS:
125 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_RECVOPTS");
126 return (IP_RECVOPTS);
127 case LINUX_IP_RETOPTS:
128 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_REETOPTS");
129 return (IP_RETOPTS);
130 case LINUX_IP_RECVTTL:
131 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_RECVTTL");
132 return (IP_RECVTTL);
133 case LINUX_IP_RECVTOS:
134 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_RECVTOS");
135 return (IP_RECVTOS);
136 case LINUX_IP_FREEBIND:
137 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_FREEBIND");
138 return (IP_BINDANY);
139 case LINUX_IP_IPSEC_POLICY:
140 /* we have this option, but not documented in ip(4) manpage */
141 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_IPSEC_POLICY");
142 return (IP_IPSEC_POLICY);
143 case LINUX_IP_MINTTL:
144 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MINTTL");
145 return (IP_MINTTL);
146 case LINUX_IP_MULTICAST_IF:
147 return (IP_MULTICAST_IF);
148 case LINUX_IP_MULTICAST_TTL:
149 return (IP_MULTICAST_TTL);
150 case LINUX_IP_MULTICAST_LOOP:
151 return (IP_MULTICAST_LOOP);
152 case LINUX_IP_ADD_MEMBERSHIP:
153 return (IP_ADD_MEMBERSHIP);
154 case LINUX_IP_DROP_MEMBERSHIP:
155 return (IP_DROP_MEMBERSHIP);
156 case LINUX_IP_UNBLOCK_SOURCE:
157 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_UNBLOCK_SOURCE");
158 return (IP_UNBLOCK_SOURCE);
159 case LINUX_IP_BLOCK_SOURCE:
160 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_BLOCK_SOURCE");
161 return (IP_BLOCK_SOURCE);
162 case LINUX_IP_ADD_SOURCE_MEMBERSHIP:
163 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_ADD_SOURCE_MEMBERSHIP");
164 return (IP_ADD_SOURCE_MEMBERSHIP);
165 case LINUX_IP_DROP_SOURCE_MEMBERSHIP:
166 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_DROP_SOURCE_MEMBERSHIP");
167 return (IP_DROP_SOURCE_MEMBERSHIP);
168 case LINUX_MCAST_JOIN_GROUP:
169 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_JOIN_GROUP");
170 return (MCAST_JOIN_GROUP);
171 case LINUX_MCAST_LEAVE_GROUP:
172 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_LEAVE_GROUP");
173 return (MCAST_LEAVE_GROUP);
174 case LINUX_MCAST_JOIN_SOURCE_GROUP:
175 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_JOIN_SOURCE_GROUP");
176 return (MCAST_JOIN_SOURCE_GROUP);
177 case LINUX_MCAST_LEAVE_SOURCE_GROUP:
178 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_LEAVE_SOURCE_GROUP");
179 return (MCAST_LEAVE_SOURCE_GROUP);
180
181 /* known but not implemented sockopts */
182 case LINUX_IP_ROUTER_ALERT:
183 LINUX_RATELIMIT_MSG_OPT1(
184 "unsupported IPv4 socket option IP_ROUTER_ALERT (%d), you can not do user-space routing from linux programs",
185 opt);
186 return (-2);
187 case LINUX_IP_PKTINFO:
188 LINUX_RATELIMIT_MSG_OPT1(
189 "unsupported IPv4 socket option IP_PKTINFO (%d), you can not get extended packet info for datagram sockets in linux programs",
190 opt);
191 return (-2);
192 case LINUX_IP_PKTOPTIONS:
193 LINUX_RATELIMIT_MSG_OPT1(
194 "unsupported IPv4 socket option IP_PKTOPTIONS (%d)",
195 opt);
196 return (-2);
197 case LINUX_IP_MTU_DISCOVER:
198 LINUX_RATELIMIT_MSG_OPT1(
199 "unsupported IPv4 socket option IP_MTU_DISCOVER (%d), your linux program can not control path-MTU discovery",
200 opt);
201 return (-2);
202 case LINUX_IP_RECVERR:
203 /* needed by steam */
204 LINUX_RATELIMIT_MSG_OPT1(
205 "unsupported IPv4 socket option IP_RECVERR (%d), you can not get extended reliability info in linux programs",
206 opt);
207 return (-2);
208 case LINUX_IP_MTU:
209 LINUX_RATELIMIT_MSG_OPT1(
210 "unsupported IPv4 socket option IP_MTU (%d), your linux program can not control the MTU on this socket",
211 opt);
212 return (-2);
213 case LINUX_IP_XFRM_POLICY:
214 LINUX_RATELIMIT_MSG_OPT1(
215 "unsupported IPv4 socket option IP_XFRM_POLICY (%d)",
216 opt);
217 return (-2);
218 case LINUX_IP_PASSSEC:
219 /* needed by steam */
220 LINUX_RATELIMIT_MSG_OPT1(
221 "unsupported IPv4 socket option IP_PASSSEC (%d), you can not get IPSEC related credential information associated with this socket in linux programs -- if you do not use IPSEC, you can ignore this",
222 opt);
223 return (-2);
224 case LINUX_IP_TRANSPARENT:
225 /* IP_BINDANY or more? */
226 LINUX_RATELIMIT_MSG_OPT1(
227 "unsupported IPv4 socket option IP_TRANSPARENT (%d), you can not enable transparent proxying in linux programs -- note, IP_FREEBIND is supported, no idea if the FreeBSD IP_BINDANY is equivalent to the Linux IP_TRANSPARENT or not, any info is welcome",
228 opt);
229 return (-2);
230 case LINUX_IP_NODEFRAG:
231 LINUX_RATELIMIT_MSG_OPT1(
232 "unsupported IPv4 socket option IP_NODEFRAG (%d)",
233 opt);
234 return (-2);
235 case LINUX_IP_CHECKSUM:
236 LINUX_RATELIMIT_MSG_OPT1(
237 "unsupported IPv4 socket option IP_CHECKSUM (%d)",
238 opt);
239 return (-2);
240 case LINUX_IP_BIND_ADDRESS_NO_PORT:
241 LINUX_RATELIMIT_MSG_OPT1(
242 "unsupported IPv4 socket option IP_BIND_ADDRESS_NO_PORT (%d)",
243 opt);
244 return (-2);
245 case LINUX_IP_RECVFRAGSIZE:
246 LINUX_RATELIMIT_MSG_OPT1(
247 "unsupported IPv4 socket option IP_RECVFRAGSIZE (%d)",
248 opt);
249 return (-2);
250 case LINUX_MCAST_MSFILTER:
251 LINUX_RATELIMIT_MSG_OPT1(
252 "unsupported IPv4 socket option IP_MCAST_MSFILTER (%d)",
253 opt);
254 return (-2);
255 case LINUX_IP_MULTICAST_ALL:
256 LINUX_RATELIMIT_MSG_OPT1(
257 "unsupported IPv4 socket option IP_MULTICAST_ALL (%d), your linux program will not see all multicast groups joined by the entire system, only those the program joined itself on this socket",
258 opt);
259 return (-2);
260 case LINUX_IP_UNICAST_IF:
261 LINUX_RATELIMIT_MSG_OPT1(
262 "unsupported IPv4 socket option IP_UNICAST_IF (%d)",
263 opt);
264 return (-2);
265
266 /* unknown sockopts */
267 default:
268 return (-1);
269 }
270 }
271
272 static int
273 linux_to_bsd_ip6_sockopt(int opt)
274 {
275
276 switch (opt) {
277 /* known and translated sockopts */
278 case LINUX_IPV6_2292PKTINFO:
279 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292PKTINFO");
280 return (IPV6_2292PKTINFO);
281 case LINUX_IPV6_2292HOPOPTS:
282 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292HOPOPTS");
283 return (IPV6_2292HOPOPTS);
284 case LINUX_IPV6_2292DSTOPTS:
285 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292DSTOPTS");
286 return (IPV6_2292DSTOPTS);
287 case LINUX_IPV6_2292RTHDR:
288 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292RTHDR");
289 return (IPV6_2292RTHDR);
290 case LINUX_IPV6_2292PKTOPTIONS:
291 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292PKTOPTIONS");
292 return (IPV6_2292PKTOPTIONS);
293 case LINUX_IPV6_CHECKSUM:
294 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_CHECKSUM");
295 return (IPV6_CHECKSUM);
296 case LINUX_IPV6_2292HOPLIMIT:
297 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292HOPLIMIT");
298 return (IPV6_2292HOPLIMIT);
299 case LINUX_IPV6_NEXTHOP:
300 return (IPV6_NEXTHOP);
301 case LINUX_IPV6_UNICAST_HOPS:
302 return (IPV6_UNICAST_HOPS);
303 case LINUX_IPV6_MULTICAST_IF:
304 return (IPV6_MULTICAST_IF);
305 case LINUX_IPV6_MULTICAST_HOPS:
306 return (IPV6_MULTICAST_HOPS);
307 case LINUX_IPV6_MULTICAST_LOOP:
308 return (IPV6_MULTICAST_LOOP);
309 case LINUX_IPV6_ADD_MEMBERSHIP:
310 return (IPV6_JOIN_GROUP);
311 case LINUX_IPV6_DROP_MEMBERSHIP:
312 return (IPV6_LEAVE_GROUP);
313 case LINUX_IPV6_V6ONLY:
314 return (IPV6_V6ONLY);
315 case LINUX_IPV6_IPSEC_POLICY:
316 /* we have this option, but not documented in ip6(4) manpage */
317 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_IPSEC_POLICY");
318 return (IPV6_IPSEC_POLICY);
319 case LINUX_MCAST_JOIN_GROUP:
320 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_JOIN_GROUP");
321 return (IPV6_JOIN_GROUP);
322 case LINUX_MCAST_LEAVE_GROUP:
323 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_LEAVE_GROUP");
324 return (IPV6_LEAVE_GROUP);
325 case LINUX_IPV6_RECVPKTINFO:
326 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVPKTINFO");
327 return (IPV6_RECVPKTINFO);
328 case LINUX_IPV6_PKTINFO:
329 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_PKTINFO");
330 return (IPV6_PKTINFO);
331 case LINUX_IPV6_RECVHOPLIMIT:
332 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVHOPLIMIT");
333 return (IPV6_RECVHOPLIMIT);
334 case LINUX_IPV6_HOPLIMIT:
335 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_HOPLIMIT");
336 return (IPV6_HOPLIMIT);
337 case LINUX_IPV6_RECVHOPOPTS:
338 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVHOPOPTS");
339 return (IPV6_RECVHOPOPTS);
340 case LINUX_IPV6_HOPOPTS:
341 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_HOPOPTS");
342 return (IPV6_HOPOPTS);
343 case LINUX_IPV6_RTHDRDSTOPTS:
344 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RTHDRDSTOPTS");
345 return (IPV6_RTHDRDSTOPTS);
346 case LINUX_IPV6_RECVRTHDR:
347 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVRTHDR");
348 return (IPV6_RECVRTHDR);
349 case LINUX_IPV6_RTHDR:
350 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RTHDR");
351 return (IPV6_RTHDR);
352 case LINUX_IPV6_RECVDSTOPTS:
353 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVDSTOPTS");
354 return (IPV6_RECVDSTOPTS);
355 case LINUX_IPV6_DSTOPTS:
356 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_DSTOPTS");
357 return (IPV6_DSTOPTS);
358 case LINUX_IPV6_RECVPATHMTU:
359 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVPATHMTU");
360 return (IPV6_RECVPATHMTU);
361 case LINUX_IPV6_PATHMTU:
362 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_PATHMTU");
363 return (IPV6_PATHMTU);
364 case LINUX_IPV6_DONTFRAG:
365 return (IPV6_DONTFRAG);
366 case LINUX_IPV6_AUTOFLOWLABEL:
367 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_AUTOFLOWLABEL");
368 return (IPV6_AUTOFLOWLABEL);
369 case LINUX_IPV6_ORIGDSTADDR:
370 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_ORIGDSTADDR");
371 return (IPV6_ORIGDSTADDR);
372 case LINUX_IPV6_FREEBIND:
373 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_FREEBIND");
374 return (IPV6_BINDANY);
375
376 /* known but not implemented sockopts */
377 case LINUX_IPV6_ADDRFORM:
378 LINUX_RATELIMIT_MSG_OPT1(
379 "unsupported IPv6 socket option IPV6_ADDRFORM (%d), you linux program can not convert the socket to IPv4",
380 opt);
381 return (-2);
382 case LINUX_IPV6_AUTHHDR:
383 LINUX_RATELIMIT_MSG_OPT1(
384 "unsupported IPv6 socket option IPV6_AUTHHDR (%d), your linux program can not get the authentication header info of IPv6 packets",
385 opt);
386 return (-2);
387 case LINUX_IPV6_FLOWINFO:
388 LINUX_RATELIMIT_MSG_OPT1(
389 "unsupported IPv6 socket option IPV6_FLOWINFO (%d), your linux program can not get the flowid of IPv6 packets",
390 opt);
391 return (-2);
392 case LINUX_IPV6_ROUTER_ALERT:
393 LINUX_RATELIMIT_MSG_OPT1(
394 "unsupported IPv6 socket option IPV6_ROUTER_ALERT (%d), you can not do user-space routing from linux programs",
395 opt);
396 return (-2);
397 case LINUX_IPV6_MTU_DISCOVER:
398 LINUX_RATELIMIT_MSG_OPT1(
399 "unsupported IPv6 socket option IPV6_MTU_DISCOVER (%d), your linux program can not control path-MTU discovery",
400 opt);
401 return (-2);
402 case LINUX_IPV6_MTU:
403 LINUX_RATELIMIT_MSG_OPT1(
404 "unsupported IPv6 socket option IPV6_MTU (%d), your linux program can not control the MTU on this socket",
405 opt);
406 return (-2);
407 case LINUX_IPV6_JOIN_ANYCAST:
408 LINUX_RATELIMIT_MSG_OPT1(
409 "unsupported IPv6 socket option IPV6_JOIN_ANYCAST (%d)",
410 opt);
411 return (-2);
412 case LINUX_IPV6_LEAVE_ANYCAST:
413 LINUX_RATELIMIT_MSG_OPT1(
414 "unsupported IPv6 socket option IPV6_LEAVE_ANYCAST (%d)",
415 opt);
416 return (-2);
417 case LINUX_IPV6_MULTICAST_ALL:
418 LINUX_RATELIMIT_MSG_OPT1(
419 "unsupported IPv6 socket option IPV6_MULTICAST_ALL (%d)",
420 opt);
421 return (-2);
422 case LINUX_IPV6_ROUTER_ALERT_ISOLATE:
423 LINUX_RATELIMIT_MSG_OPT1(
424 "unsupported IPv6 socket option IPV6_ROUTER_ALERT_ISOLATE (%d)",
425 opt);
426 return (-2);
427 case LINUX_IPV6_FLOWLABEL_MGR:
428 LINUX_RATELIMIT_MSG_OPT1(
429 "unsupported IPv6 socket option IPV6_FLOWLABEL_MGR (%d)",
430 opt);
431 return (-2);
432 case LINUX_IPV6_FLOWINFO_SEND:
433 LINUX_RATELIMIT_MSG_OPT1(
434 "unsupported IPv6 socket option IPV6_FLOWINFO_SEND (%d)",
435 opt);
436 return (-2);
437 case LINUX_IPV6_XFRM_POLICY:
438 LINUX_RATELIMIT_MSG_OPT1(
439 "unsupported IPv6 socket option IPV6_XFRM_POLICY (%d)",
440 opt);
441 return (-2);
442 case LINUX_IPV6_HDRINCL:
443 LINUX_RATELIMIT_MSG_OPT1(
444 "unsupported IPv6 socket option IPV6_HDRINCL (%d)",
445 opt);
446 return (-2);
447 case LINUX_MCAST_BLOCK_SOURCE:
448 LINUX_RATELIMIT_MSG_OPT1(
449 "unsupported IPv6 socket option MCAST_BLOCK_SOURCE (%d), your linux program may see more multicast stuff than it wants",
450 opt);
451 return (-2);
452 case LINUX_MCAST_UNBLOCK_SOURCE:
453 LINUX_RATELIMIT_MSG_OPT1(
454 "unsupported IPv6 socket option MCAST_UNBLOCK_SOURCE (%d), your linux program may not see all the multicast stuff it wants",
455 opt);
456 return (-2);
457 case LINUX_MCAST_JOIN_SOURCE_GROUP:
458 LINUX_RATELIMIT_MSG_OPT1(
459 "unsupported IPv6 socket option MCAST_JOIN_SOURCE_GROUP (%d), your linux program is not able to join a multicast source group",
460 opt);
461 return (-2);
462 case LINUX_MCAST_LEAVE_SOURCE_GROUP:
463 LINUX_RATELIMIT_MSG_OPT1(
464 "unsupported IPv6 socket option MCAST_LEAVE_SOURCE_GROUP (%d), your linux program is not able to leave a multicast source group -- but it was also not able to join one, so no issue",
465 opt);
466 return (-2);
467 case LINUX_MCAST_MSFILTER:
468 LINUX_RATELIMIT_MSG_OPT1(
469 "unsupported IPv6 socket option MCAST_MSFILTER (%d), your linux program can not manipulate the multicast filter, it may see more multicast data than it wants to see",
470 opt);
471 return (-2);
472 case LINUX_IPV6_ADDR_PREFERENCES:
473 LINUX_RATELIMIT_MSG_OPT1(
474 "unsupported IPv6 socket option IPV6_ADDR_PREFERENCES (%d)",
475 opt);
476 return (-2);
477 case LINUX_IPV6_MINHOPCOUNT:
478 LINUX_RATELIMIT_MSG_OPT1(
479 "unsupported IPv6 socket option IPV6_MINHOPCOUNT (%d)",
480 opt);
481 return (-2);
482 case LINUX_IPV6_TRANSPARENT:
483 /* IP_BINDANY or more? */
484 LINUX_RATELIMIT_MSG_OPT1(
485 "unsupported IPv6 socket option IPV6_TRANSPARENT (%d), you can not enable transparent proxying in linux programs -- note, IP_FREEBIND is supported, no idea if the FreeBSD IP_BINDANY is equivalent to the Linux IP_TRANSPARENT or not, any info is welcome",
486 opt);
487 return (-2);
488 case LINUX_IPV6_UNICAST_IF:
489 LINUX_RATELIMIT_MSG_OPT1(
490 "unsupported IPv6 socket option IPV6_UNICAST_IF (%d)",
491 opt);
492 return (-2);
493 case LINUX_IPV6_RECVFRAGSIZE:
494 LINUX_RATELIMIT_MSG_OPT1(
495 "unsupported IPv6 socket option IPV6_RECVFRAGSIZE (%d)",
496 opt);
497 return (-2);
498
499 /* unknown sockopts */
500 default:
501 return (-1);
502 }
503 }
504
505 static int
506 linux_to_bsd_so_sockopt(int opt)
507 {
508
509 switch (opt) {
510 case LINUX_SO_DEBUG:
511 return (SO_DEBUG);
512 case LINUX_SO_REUSEADDR:
513 return (SO_REUSEADDR);
514 case LINUX_SO_TYPE:
515 return (SO_TYPE);
516 case LINUX_SO_ERROR:
517 return (SO_ERROR);
518 case LINUX_SO_DONTROUTE:
519 return (SO_DONTROUTE);
520 case LINUX_SO_BROADCAST:
521 return (SO_BROADCAST);
522 case LINUX_SO_SNDBUF:
523 case LINUX_SO_SNDBUFFORCE:
524 return (SO_SNDBUF);
525 case LINUX_SO_RCVBUF:
526 case LINUX_SO_RCVBUFFORCE:
527 return (SO_RCVBUF);
528 case LINUX_SO_KEEPALIVE:
529 return (SO_KEEPALIVE);
530 case LINUX_SO_OOBINLINE:
531 return (SO_OOBINLINE);
532 case LINUX_SO_LINGER:
533 return (SO_LINGER);
534 case LINUX_SO_REUSEPORT:
535 return (SO_REUSEPORT_LB);
536 case LINUX_SO_PASSCRED:
537 return (LOCAL_CREDS_PERSISTENT);
538 case LINUX_SO_PEERCRED:
539 return (LOCAL_PEERCRED);
540 case LINUX_SO_RCVLOWAT:
541 return (SO_RCVLOWAT);
542 case LINUX_SO_SNDLOWAT:
543 return (SO_SNDLOWAT);
544 case LINUX_SO_RCVTIMEO:
545 return (SO_RCVTIMEO);
546 case LINUX_SO_SNDTIMEO:
547 return (SO_SNDTIMEO);
548 case LINUX_SO_TIMESTAMP:
549 return (SO_TIMESTAMP);
550 case LINUX_SO_ACCEPTCONN:
551 return (SO_ACCEPTCONN);
552 case LINUX_SO_PROTOCOL:
553 return (SO_PROTOCOL);
554 }
555 return (-1);
556 }
557
558 static int
559 linux_to_bsd_tcp_sockopt(int opt)
560 {
561
562 switch (opt) {
563 case LINUX_TCP_NODELAY:
564 return (TCP_NODELAY);
565 case LINUX_TCP_MAXSEG:
566 return (TCP_MAXSEG);
567 case LINUX_TCP_CORK:
568 return (TCP_NOPUSH);
569 case LINUX_TCP_KEEPIDLE:
570 return (TCP_KEEPIDLE);
571 case LINUX_TCP_KEEPINTVL:
572 return (TCP_KEEPINTVL);
573 case LINUX_TCP_KEEPCNT:
574 return (TCP_KEEPCNT);
575 case LINUX_TCP_MD5SIG:
576 return (TCP_MD5SIG);
577 }
578 return (-1);
579 }
580
581 static int
582 linux_to_bsd_msg_flags(int flags)
583 {
584 int ret_flags = 0;
585
586 if (flags & LINUX_MSG_OOB)
587 ret_flags |= MSG_OOB;
588 if (flags & LINUX_MSG_PEEK)
589 ret_flags |= MSG_PEEK;
590 if (flags & LINUX_MSG_DONTROUTE)
591 ret_flags |= MSG_DONTROUTE;
592 if (flags & LINUX_MSG_CTRUNC)
593 ret_flags |= MSG_CTRUNC;
594 if (flags & LINUX_MSG_TRUNC)
595 ret_flags |= MSG_TRUNC;
596 if (flags & LINUX_MSG_DONTWAIT)
597 ret_flags |= MSG_DONTWAIT;
598 if (flags & LINUX_MSG_EOR)
599 ret_flags |= MSG_EOR;
600 if (flags & LINUX_MSG_WAITALL)
601 ret_flags |= MSG_WAITALL;
602 if (flags & LINUX_MSG_NOSIGNAL)
603 ret_flags |= MSG_NOSIGNAL;
604 if (flags & LINUX_MSG_PROXY)
605 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_PROXY (%d) not handled",
606 LINUX_MSG_PROXY);
607 if (flags & LINUX_MSG_FIN)
608 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_FIN (%d) not handled",
609 LINUX_MSG_FIN);
610 if (flags & LINUX_MSG_SYN)
611 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_SYN (%d) not handled",
612 LINUX_MSG_SYN);
613 if (flags & LINUX_MSG_CONFIRM)
614 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_CONFIRM (%d) not handled",
615 LINUX_MSG_CONFIRM);
616 if (flags & LINUX_MSG_RST)
617 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_RST (%d) not handled",
618 LINUX_MSG_RST);
619 if (flags & LINUX_MSG_ERRQUEUE)
620 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_ERRQUEUE (%d) not handled",
621 LINUX_MSG_ERRQUEUE);
622 return (ret_flags);
623 }
624
625 static int
626 linux_to_bsd_cmsg_type(int cmsg_type)
627 {
628
629 switch (cmsg_type) {
630 case LINUX_SCM_RIGHTS:
631 return (SCM_RIGHTS);
632 case LINUX_SCM_CREDENTIALS:
633 return (SCM_CREDS);
634 }
635 return (-1);
636 }
637
638 static int
639 bsd_to_linux_cmsg_type(int cmsg_type)
640 {
641
642 switch (cmsg_type) {
643 case SCM_RIGHTS:
644 return (LINUX_SCM_RIGHTS);
645 case SCM_CREDS:
646 return (LINUX_SCM_CREDENTIALS);
647 case SCM_CREDS2:
648 return (LINUX_SCM_CREDENTIALS);
649 case SCM_TIMESTAMP:
650 return (LINUX_SCM_TIMESTAMP);
651 }
652 return (-1);
653 }
654
655 static int
656 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
657 {
658 if (lhdr->msg_controllen > INT_MAX)
659 return (ENOBUFS);
660
661 bhdr->msg_name = PTRIN(lhdr->msg_name);
662 bhdr->msg_namelen = lhdr->msg_namelen;
663 bhdr->msg_iov = PTRIN(lhdr->msg_iov);
664 bhdr->msg_iovlen = lhdr->msg_iovlen;
665 bhdr->msg_control = PTRIN(lhdr->msg_control);
666
667 /*
668 * msg_controllen is skipped since BSD and LINUX control messages
669 * are potentially different sizes (e.g. the cred structure used
670 * by SCM_CREDS is different between the two operating system).
671 *
672 * The caller can set it (if necessary) after converting all the
673 * control messages.
674 */
675
676 bhdr->msg_flags = linux_to_bsd_msg_flags(lhdr->msg_flags);
677 return (0);
678 }
679
680 static int
681 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
682 {
683 lhdr->msg_name = PTROUT(bhdr->msg_name);
684 lhdr->msg_namelen = bhdr->msg_namelen;
685 lhdr->msg_iov = PTROUT(bhdr->msg_iov);
686 lhdr->msg_iovlen = bhdr->msg_iovlen;
687 lhdr->msg_control = PTROUT(bhdr->msg_control);
688
689 /*
690 * msg_controllen is skipped since BSD and LINUX control messages
691 * are potentially different sizes (e.g. the cred structure used
692 * by SCM_CREDS is different between the two operating system).
693 *
694 * The caller can set it (if necessary) after converting all the
695 * control messages.
696 */
697
698 /* msg_flags skipped */
699 return (0);
700 }
701
702 static int
703 linux_set_socket_flags(int lflags, int *flags)
704 {
705
706 if (lflags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
707 return (EINVAL);
708 if (lflags & LINUX_SOCK_NONBLOCK)
709 *flags |= SOCK_NONBLOCK;
710 if (lflags & LINUX_SOCK_CLOEXEC)
711 *flags |= SOCK_CLOEXEC;
712 return (0);
713 }
714
715 static int
716 linux_copyout_sockaddr(const struct sockaddr *sa, void *uaddr, size_t len)
717 {
718 struct l_sockaddr *lsa;
719 int error;
720
721 error = bsd_to_linux_sockaddr(sa, &lsa, len);
722 if (error != 0)
723 return (error);
724
725 error = copyout(lsa, uaddr, len);
726 free(lsa, M_SONAME);
727
728 return (error);
729 }
730
731 static int
732 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
733 struct mbuf *control, enum uio_seg segflg)
734 {
735 struct sockaddr *to;
736 int error, len;
737
738 if (mp->msg_name != NULL) {
739 len = mp->msg_namelen;
740 error = linux_to_bsd_sockaddr(mp->msg_name, &to, &len);
741 if (error != 0)
742 return (error);
743 mp->msg_name = to;
744 } else
745 to = NULL;
746
747 error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
748 segflg);
749
750 if (to)
751 free(to, M_SONAME);
752 return (error);
753 }
754
755 /* Return 0 if IP_HDRINCL is set for the given socket. */
756 static int
757 linux_check_hdrincl(struct thread *td, int s)
758 {
759 int error, optval;
760 socklen_t size_val;
761
762 size_val = sizeof(optval);
763 error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
764 &optval, UIO_SYSSPACE, &size_val);
765 if (error != 0)
766 return (error);
767
768 return (optval == 0);
769 }
770
771 /*
772 * Updated sendto() when IP_HDRINCL is set:
773 * tweak endian-dependent fields in the IP packet.
774 */
775 static int
776 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
777 {
778 /*
779 * linux_ip_copysize defines how many bytes we should copy
780 * from the beginning of the IP packet before we customize it for BSD.
781 * It should include all the fields we modify (ip_len and ip_off).
782 */
783 #define linux_ip_copysize 8
784
785 struct ip *packet;
786 struct msghdr msg;
787 struct iovec aiov[1];
788 int error;
789
790 /* Check that the packet isn't too big or too small. */
791 if (linux_args->len < linux_ip_copysize ||
792 linux_args->len > IP_MAXPACKET)
793 return (EINVAL);
794
795 packet = (struct ip *)malloc(linux_args->len, M_LINUX, M_WAITOK);
796
797 /* Make kernel copy of the packet to be sent */
798 if ((error = copyin(PTRIN(linux_args->msg), packet,
799 linux_args->len)))
800 goto goout;
801
802 /* Convert fields from Linux to BSD raw IP socket format */
803 packet->ip_len = linux_args->len;
804 packet->ip_off = ntohs(packet->ip_off);
805
806 /* Prepare the msghdr and iovec structures describing the new packet */
807 msg.msg_name = PTRIN(linux_args->to);
808 msg.msg_namelen = linux_args->tolen;
809 msg.msg_iov = aiov;
810 msg.msg_iovlen = 1;
811 msg.msg_control = NULL;
812 msg.msg_flags = 0;
813 aiov[0].iov_base = (char *)packet;
814 aiov[0].iov_len = linux_args->len;
815 error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
816 NULL, UIO_SYSSPACE);
817 goout:
818 free(packet, M_LINUX);
819 return (error);
820 }
821
822 static const char *linux_netlink_names[] = {
823 [LINUX_NETLINK_ROUTE] = "ROUTE",
824 [LINUX_NETLINK_SOCK_DIAG] = "SOCK_DIAG",
825 [LINUX_NETLINK_NFLOG] = "NFLOG",
826 [LINUX_NETLINK_SELINUX] = "SELINUX",
827 [LINUX_NETLINK_AUDIT] = "AUDIT",
828 [LINUX_NETLINK_FIB_LOOKUP] = "FIB_LOOKUP",
829 [LINUX_NETLINK_NETFILTER] = "NETFILTER",
830 [LINUX_NETLINK_KOBJECT_UEVENT] = "KOBJECT_UEVENT",
831 };
832
833 int
834 linux_socket(struct thread *td, struct linux_socket_args *args)
835 {
836 int domain, retval_socket, type;
837
838 type = args->type & LINUX_SOCK_TYPE_MASK;
839 if (type < 0 || type > LINUX_SOCK_MAX)
840 return (EINVAL);
841 retval_socket = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK,
842 &type);
843 if (retval_socket != 0)
844 return (retval_socket);
845 domain = linux_to_bsd_domain(args->domain);
846 if (domain == -1) {
847 /* Mask off SOCK_NONBLOCK / CLOEXEC for error messages. */
848 type = args->type & LINUX_SOCK_TYPE_MASK;
849 if (args->domain == LINUX_AF_NETLINK &&
850 args->protocol == LINUX_NETLINK_AUDIT) {
851 ; /* Do nothing, quietly. */
852 } else if (args->domain == LINUX_AF_NETLINK) {
853 const char *nl_name;
854
855 if (args->protocol >= 0 &&
856 args->protocol < nitems(linux_netlink_names))
857 nl_name = linux_netlink_names[args->protocol];
858 else
859 nl_name = NULL;
860 if (nl_name != NULL)
861 linux_msg(curthread,
862 "unsupported socket(AF_NETLINK, %d, "
863 "NETLINK_%s)", type, nl_name);
864 else
865 linux_msg(curthread,
866 "unsupported socket(AF_NETLINK, %d, %d)",
867 type, args->protocol);
868 } else {
869 linux_msg(curthread, "unsupported socket domain %d, "
870 "type %d, protocol %d", args->domain, type,
871 args->protocol);
872 }
873 return (EAFNOSUPPORT);
874 }
875
876 retval_socket = kern_socket(td, domain, type, args->protocol);
877 if (retval_socket)
878 return (retval_socket);
879
880 if (type == SOCK_RAW
881 && (args->protocol == IPPROTO_RAW || args->protocol == 0)
882 && domain == PF_INET) {
883 /* It's a raw IP socket: set the IP_HDRINCL option. */
884 int hdrincl;
885
886 hdrincl = 1;
887 /* We ignore any error returned by kern_setsockopt() */
888 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
889 &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
890 }
891 #ifdef INET6
892 /*
893 * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
894 * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
895 * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
896 * sysctl value.
897 */
898 if (domain == PF_INET6) {
899 int v6only;
900
901 v6only = 0;
902 /* We ignore any error returned by setsockopt() */
903 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
904 &v6only, UIO_SYSSPACE, sizeof(v6only));
905 }
906 #endif
907
908 return (retval_socket);
909 }
910
911 int
912 linux_bind(struct thread *td, struct linux_bind_args *args)
913 {
914 struct sockaddr *sa;
915 int error;
916
917 error = linux_to_bsd_sockaddr(PTRIN(args->name), &sa,
918 &args->namelen);
919 if (error != 0)
920 return (error);
921
922 error = kern_bindat(td, AT_FDCWD, args->s, sa);
923 free(sa, M_SONAME);
924
925 /* XXX */
926 if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
927 return (EINVAL);
928 return (error);
929 }
930
931 int
932 linux_connect(struct thread *td, struct linux_connect_args *args)
933 {
934 struct socket *so;
935 struct sockaddr *sa;
936 struct file *fp;
937 u_int fflag;
938 int error;
939
940 error = linux_to_bsd_sockaddr(PTRIN(args->name), &sa,
941 &args->namelen);
942 if (error != 0)
943 return (error);
944
945 error = kern_connectat(td, AT_FDCWD, args->s, sa);
946 free(sa, M_SONAME);
947 if (error != EISCONN)
948 return (error);
949
950 /*
951 * Linux doesn't return EISCONN the first time it occurs,
952 * when on a non-blocking socket. Instead it returns the
953 * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
954 */
955 error = getsock_cap(td, args->s, &cap_connect_rights,
956 &fp, &fflag, NULL);
957 if (error != 0)
958 return (error);
959
960 error = EISCONN;
961 so = fp->f_data;
962 if (fflag & FNONBLOCK) {
963 SOCK_LOCK(so);
964 if (so->so_emuldata == 0)
965 error = so->so_error;
966 so->so_emuldata = (void *)1;
967 SOCK_UNLOCK(so);
968 }
969 fdrop(fp, td);
970
971 return (error);
972 }
973
974 int
975 linux_listen(struct thread *td, struct linux_listen_args *args)
976 {
977
978 return (kern_listen(td, args->s, args->backlog));
979 }
980
981 static int
982 linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
983 l_uintptr_t namelen, int flags)
984 {
985 struct sockaddr *sa;
986 struct file *fp, *fp1;
987 int bflags, len;
988 struct socket *so;
989 int error, error1;
990
991 bflags = 0;
992 fp = NULL;
993 sa = NULL;
994
995 error = linux_set_socket_flags(flags, &bflags);
996 if (error != 0)
997 return (error);
998
999 if (PTRIN(addr) == NULL) {
1000 len = 0;
1001 error = kern_accept4(td, s, NULL, NULL, bflags, NULL);
1002 } else {
1003 error = copyin(PTRIN(namelen), &len, sizeof(len));
1004 if (error != 0)
1005 return (error);
1006 if (len < 0)
1007 return (EINVAL);
1008 error = kern_accept4(td, s, &sa, &len, bflags, &fp);
1009 }
1010
1011 /*
1012 * Translate errno values into ones used by Linux.
1013 */
1014 if (error != 0) {
1015 /*
1016 * XXX. This is wrong, different sockaddr structures
1017 * have different sizes.
1018 */
1019 switch (error) {
1020 case EFAULT:
1021 if (namelen != sizeof(struct sockaddr_in))
1022 error = EINVAL;
1023 break;
1024 case EINVAL:
1025 error1 = getsock_cap(td, s, &cap_accept_rights, &fp1, NULL, NULL);
1026 if (error1 != 0) {
1027 error = error1;
1028 break;
1029 }
1030 so = fp1->f_data;
1031 if (so->so_type == SOCK_DGRAM)
1032 error = EOPNOTSUPP;
1033 fdrop(fp1, td);
1034 break;
1035 }
1036 return (error);
1037 }
1038
1039 if (len != 0) {
1040 error = linux_copyout_sockaddr(sa, PTRIN(addr), len);
1041
1042 /*
1043 * XXX: We should also copyout the len, shouldn't we?
1044 */
1045
1046 if (error != 0) {
1047 fdclose(td, fp, td->td_retval[0]);
1048 td->td_retval[0] = 0;
1049 }
1050 }
1051 if (fp != NULL)
1052 fdrop(fp, td);
1053 free(sa, M_SONAME);
1054 return (error);
1055 }
1056
1057 int
1058 linux_accept(struct thread *td, struct linux_accept_args *args)
1059 {
1060
1061 return (linux_accept_common(td, args->s, args->addr,
1062 args->namelen, 0));
1063 }
1064
1065 int
1066 linux_accept4(struct thread *td, struct linux_accept4_args *args)
1067 {
1068
1069 return (linux_accept_common(td, args->s, args->addr,
1070 args->namelen, args->flags));
1071 }
1072
1073 int
1074 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
1075 {
1076 struct sockaddr *sa;
1077 int len, error;
1078
1079 error = copyin(PTRIN(args->namelen), &len, sizeof(len));
1080 if (error != 0)
1081 return (error);
1082
1083 error = kern_getsockname(td, args->s, &sa, &len);
1084 if (error != 0)
1085 return (error);
1086
1087 if (len != 0)
1088 error = linux_copyout_sockaddr(sa, PTRIN(args->addr), len);
1089
1090 free(sa, M_SONAME);
1091 if (error == 0)
1092 error = copyout(&len, PTRIN(args->namelen), sizeof(len));
1093 return (error);
1094 }
1095
1096 int
1097 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
1098 {
1099 struct sockaddr *sa;
1100 int len, error;
1101
1102 error = copyin(PTRIN(args->namelen), &len, sizeof(len));
1103 if (error != 0)
1104 return (error);
1105 if (len < 0)
1106 return (EINVAL);
1107
1108 error = kern_getpeername(td, args->s, &sa, &len);
1109 if (error != 0)
1110 return (error);
1111
1112 if (len != 0)
1113 error = linux_copyout_sockaddr(sa, PTRIN(args->addr), len);
1114
1115 free(sa, M_SONAME);
1116 if (error == 0)
1117 error = copyout(&len, PTRIN(args->namelen), sizeof(len));
1118 return (error);
1119 }
1120
1121 int
1122 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
1123 {
1124 int domain, error, sv[2], type;
1125
1126 domain = linux_to_bsd_domain(args->domain);
1127 if (domain != PF_LOCAL)
1128 return (EAFNOSUPPORT);
1129 type = args->type & LINUX_SOCK_TYPE_MASK;
1130 if (type < 0 || type > LINUX_SOCK_MAX)
1131 return (EINVAL);
1132 error = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK,
1133 &type);
1134 if (error != 0)
1135 return (error);
1136 if (args->protocol != 0 && args->protocol != PF_UNIX) {
1137 /*
1138 * Use of PF_UNIX as protocol argument is not right,
1139 * but Linux does it.
1140 * Do not map PF_UNIX as its Linux value is identical
1141 * to FreeBSD one.
1142 */
1143 return (EPROTONOSUPPORT);
1144 }
1145 error = kern_socketpair(td, domain, type, 0, sv);
1146 if (error != 0)
1147 return (error);
1148 error = copyout(sv, PTRIN(args->rsv), 2 * sizeof(int));
1149 if (error != 0) {
1150 (void)kern_close(td, sv[0]);
1151 (void)kern_close(td, sv[1]);
1152 }
1153 return (error);
1154 }
1155
1156 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
1157 struct linux_send_args {
1158 register_t s;
1159 register_t msg;
1160 register_t len;
1161 register_t flags;
1162 };
1163
1164 static int
1165 linux_send(struct thread *td, struct linux_send_args *args)
1166 {
1167 struct sendto_args /* {
1168 int s;
1169 caddr_t buf;
1170 int len;
1171 int flags;
1172 caddr_t to;
1173 int tolen;
1174 } */ bsd_args;
1175 struct file *fp;
1176 int error, fflag;
1177
1178 bsd_args.s = args->s;
1179 bsd_args.buf = (caddr_t)PTRIN(args->msg);
1180 bsd_args.len = args->len;
1181 bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
1182 bsd_args.to = NULL;
1183 bsd_args.tolen = 0;
1184 error = sys_sendto(td, &bsd_args);
1185 if (error == ENOTCONN) {
1186 /*
1187 * Linux doesn't return ENOTCONN for non-blocking sockets.
1188 * Instead it returns the EAGAIN.
1189 */
1190 error = getsock_cap(td, args->s, &cap_send_rights, &fp,
1191 &fflag, NULL);
1192 if (error == 0) {
1193 if (fflag & FNONBLOCK)
1194 error = EAGAIN;
1195 fdrop(fp, td);
1196 }
1197 }
1198 return (error);
1199 }
1200
1201 struct linux_recv_args {
1202 register_t s;
1203 register_t msg;
1204 register_t len;
1205 register_t flags;
1206 };
1207
1208 static int
1209 linux_recv(struct thread *td, struct linux_recv_args *args)
1210 {
1211 struct recvfrom_args /* {
1212 int s;
1213 caddr_t buf;
1214 int len;
1215 int flags;
1216 struct sockaddr *from;
1217 socklen_t fromlenaddr;
1218 } */ bsd_args;
1219
1220 bsd_args.s = args->s;
1221 bsd_args.buf = (caddr_t)PTRIN(args->msg);
1222 bsd_args.len = args->len;
1223 bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
1224 bsd_args.from = NULL;
1225 bsd_args.fromlenaddr = 0;
1226 return (sys_recvfrom(td, &bsd_args));
1227 }
1228 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
1229
1230 int
1231 linux_sendto(struct thread *td, struct linux_sendto_args *args)
1232 {
1233 struct msghdr msg;
1234 struct iovec aiov;
1235
1236 if (linux_check_hdrincl(td, args->s) == 0)
1237 /* IP_HDRINCL set, tweak the packet before sending */
1238 return (linux_sendto_hdrincl(td, args));
1239
1240 msg.msg_name = PTRIN(args->to);
1241 msg.msg_namelen = args->tolen;
1242 msg.msg_iov = &aiov;
1243 msg.msg_iovlen = 1;
1244 msg.msg_control = NULL;
1245 msg.msg_flags = 0;
1246 aiov.iov_base = PTRIN(args->msg);
1247 aiov.iov_len = args->len;
1248 return (linux_sendit(td, args->s, &msg, args->flags, NULL,
1249 UIO_USERSPACE));
1250 }
1251
1252 int
1253 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
1254 {
1255 struct sockaddr *sa;
1256 struct msghdr msg;
1257 struct iovec aiov;
1258 int error, fromlen;
1259
1260 if (PTRIN(args->fromlen) != NULL) {
1261 error = copyin(PTRIN(args->fromlen), &fromlen,
1262 sizeof(fromlen));
1263 if (error != 0)
1264 return (error);
1265 if (fromlen < 0)
1266 return (EINVAL);
1267 sa = malloc(fromlen, M_SONAME, M_WAITOK);
1268 } else {
1269 fromlen = 0;
1270 sa = NULL;
1271 }
1272
1273 msg.msg_name = sa;
1274 msg.msg_namelen = fromlen;
1275 msg.msg_iov = &aiov;
1276 msg.msg_iovlen = 1;
1277 aiov.iov_base = PTRIN(args->buf);
1278 aiov.iov_len = args->len;
1279 msg.msg_control = 0;
1280 msg.msg_flags = linux_to_bsd_msg_flags(args->flags);
1281
1282 error = kern_recvit(td, args->s, &msg, UIO_SYSSPACE, NULL);
1283 if (error != 0)
1284 goto out;
1285
1286 if (PTRIN(args->from) != NULL)
1287 error = linux_copyout_sockaddr(sa, PTRIN(args->from), msg.msg_namelen);
1288
1289 if (error == 0 && PTRIN(args->fromlen) != NULL)
1290 error = copyout(&msg.msg_namelen, PTRIN(args->fromlen),
1291 sizeof(msg.msg_namelen));
1292 out:
1293 free(sa, M_SONAME);
1294 return (error);
1295 }
1296
1297 static int
1298 linux_sendmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
1299 l_uint flags)
1300 {
1301 struct cmsghdr *cmsg;
1302 struct mbuf *control;
1303 struct msghdr msg;
1304 struct l_cmsghdr linux_cmsg;
1305 struct l_cmsghdr *ptr_cmsg;
1306 struct l_msghdr linux_msghdr;
1307 struct iovec *iov;
1308 socklen_t datalen;
1309 struct sockaddr *sa;
1310 struct socket *so;
1311 sa_family_t sa_family;
1312 struct file *fp;
1313 void *data;
1314 l_size_t len;
1315 l_size_t clen;
1316 int error, fflag;
1317
1318 error = copyin(msghdr, &linux_msghdr, sizeof(linux_msghdr));
1319 if (error != 0)
1320 return (error);
1321
1322 /*
1323 * Some Linux applications (ping) define a non-NULL control data
1324 * pointer, but a msg_controllen of 0, which is not allowed in the
1325 * FreeBSD system call interface. NULL the msg_control pointer in
1326 * order to handle this case. This should be checked, but allows the
1327 * Linux ping to work.
1328 */
1329 if (PTRIN(linux_msghdr.msg_control) != NULL &&
1330 linux_msghdr.msg_controllen == 0)
1331 linux_msghdr.msg_control = PTROUT(NULL);
1332
1333 error = linux_to_bsd_msghdr(&msg, &linux_msghdr);
1334 if (error != 0)
1335 return (error);
1336
1337 #ifdef COMPAT_LINUX32
1338 error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
1339 &iov, EMSGSIZE);
1340 #else
1341 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1342 #endif
1343 if (error != 0)
1344 return (error);
1345
1346 control = NULL;
1347
1348 error = kern_getsockname(td, s, &sa, &datalen);
1349 if (error != 0)
1350 goto bad;
1351 sa_family = sa->sa_family;
1352 free(sa, M_SONAME);
1353
1354 if (flags & LINUX_MSG_OOB) {
1355 error = EOPNOTSUPP;
1356 if (sa_family == AF_UNIX)
1357 goto bad;
1358
1359 error = getsock_cap(td, s, &cap_send_rights, &fp,
1360 &fflag, NULL);
1361 if (error != 0)
1362 goto bad;
1363 so = fp->f_data;
1364 if (so->so_type != SOCK_STREAM)
1365 error = EOPNOTSUPP;
1366 fdrop(fp, td);
1367 if (error != 0)
1368 goto bad;
1369 }
1370
1371 if (linux_msghdr.msg_controllen >= sizeof(struct l_cmsghdr)) {
1372 error = ENOBUFS;
1373 control = m_get(M_WAITOK, MT_CONTROL);
1374 MCLGET(control, M_WAITOK);
1375 data = mtod(control, void *);
1376 datalen = 0;
1377
1378 ptr_cmsg = PTRIN(linux_msghdr.msg_control);
1379 clen = linux_msghdr.msg_controllen;
1380 do {
1381 error = copyin(ptr_cmsg, &linux_cmsg,
1382 sizeof(struct l_cmsghdr));
1383 if (error != 0)
1384 goto bad;
1385
1386 error = EINVAL;
1387 if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr) ||
1388 linux_cmsg.cmsg_len > clen)
1389 goto bad;
1390
1391 if (datalen + CMSG_HDRSZ > MCLBYTES)
1392 goto bad;
1393
1394 /*
1395 * Now we support only SCM_RIGHTS and SCM_CRED,
1396 * so return EINVAL in any other cmsg_type
1397 */
1398 cmsg = data;
1399 cmsg->cmsg_type =
1400 linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
1401 cmsg->cmsg_level =
1402 linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
1403 if (cmsg->cmsg_type == -1
1404 || cmsg->cmsg_level != SOL_SOCKET) {
1405 linux_msg(curthread,
1406 "unsupported sendmsg cmsg level %d type %d",
1407 linux_cmsg.cmsg_level, linux_cmsg.cmsg_type);
1408 goto bad;
1409 }
1410
1411 /*
1412 * Some applications (e.g. pulseaudio) attempt to
1413 * send ancillary data even if the underlying protocol
1414 * doesn't support it which is not allowed in the
1415 * FreeBSD system call interface.
1416 */
1417 if (sa_family != AF_UNIX)
1418 goto next;
1419
1420 if (cmsg->cmsg_type == SCM_CREDS) {
1421 len = sizeof(struct cmsgcred);
1422 if (datalen + CMSG_SPACE(len) > MCLBYTES)
1423 goto bad;
1424
1425 /*
1426 * The lower levels will fill in the structure
1427 */
1428 memset(CMSG_DATA(data), 0, len);
1429 } else {
1430 len = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
1431 if (datalen + CMSG_SPACE(len) < datalen ||
1432 datalen + CMSG_SPACE(len) > MCLBYTES)
1433 goto bad;
1434
1435 error = copyin(LINUX_CMSG_DATA(ptr_cmsg),
1436 CMSG_DATA(data), len);
1437 if (error != 0)
1438 goto bad;
1439 }
1440
1441 cmsg->cmsg_len = CMSG_LEN(len);
1442 data = (char *)data + CMSG_SPACE(len);
1443 datalen += CMSG_SPACE(len);
1444
1445 next:
1446 if (clen <= LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len))
1447 break;
1448
1449 clen -= LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len);
1450 ptr_cmsg = (struct l_cmsghdr *)((char *)ptr_cmsg +
1451 LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len));
1452 } while(clen >= sizeof(struct l_cmsghdr));
1453
1454 control->m_len = datalen;
1455 if (datalen == 0) {
1456 m_freem(control);
1457 control = NULL;
1458 }
1459 }
1460
1461 msg.msg_iov = iov;
1462 msg.msg_flags = 0;
1463 error = linux_sendit(td, s, &msg, flags, control, UIO_USERSPACE);
1464 control = NULL;
1465
1466 bad:
1467 m_freem(control);
1468 free(iov, M_IOV);
1469 return (error);
1470 }
1471
1472 int
1473 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
1474 {
1475
1476 return (linux_sendmsg_common(td, args->s, PTRIN(args->msg),
1477 args->flags));
1478 }
1479
1480 int
1481 linux_sendmmsg(struct thread *td, struct linux_sendmmsg_args *args)
1482 {
1483 struct l_mmsghdr *msg;
1484 l_uint retval;
1485 int error, datagrams;
1486
1487 if (args->vlen > UIO_MAXIOV)
1488 args->vlen = UIO_MAXIOV;
1489
1490 msg = PTRIN(args->msg);
1491 datagrams = 0;
1492 while (datagrams < args->vlen) {
1493 error = linux_sendmsg_common(td, args->s, &msg->msg_hdr,
1494 args->flags);
1495 if (error != 0)
1496 break;
1497
1498 retval = td->td_retval[0];
1499 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len));
1500 if (error != 0)
1501 break;
1502 ++msg;
1503 ++datagrams;
1504 }
1505 if (error == 0)
1506 td->td_retval[0] = datagrams;
1507 return (error);
1508 }
1509
1510 static int
1511 linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
1512 l_uint flags, struct msghdr *msg)
1513 {
1514 struct cmsghdr *cm;
1515 struct cmsgcred *cmcred;
1516 struct sockcred2 *scred;
1517 struct l_cmsghdr *linux_cmsg = NULL;
1518 struct l_ucred linux_ucred;
1519 socklen_t datalen, maxlen, outlen;
1520 struct l_msghdr linux_msghdr;
1521 struct iovec *iov, *uiov;
1522 struct mbuf *control = NULL;
1523 struct mbuf **controlp;
1524 struct timeval *ftmvl;
1525 struct sockaddr *sa;
1526 l_timeval ltmvl;
1527 caddr_t outbuf;
1528 void *data;
1529 int error, i, fd, fds, *fdp;
1530
1531 error = copyin(msghdr, &linux_msghdr, sizeof(linux_msghdr));
1532 if (error != 0)
1533 return (error);
1534
1535 error = linux_to_bsd_msghdr(msg, &linux_msghdr);
1536 if (error != 0)
1537 return (error);
1538
1539 #ifdef COMPAT_LINUX32
1540 error = linux32_copyiniov(PTRIN(msg->msg_iov), msg->msg_iovlen,
1541 &iov, EMSGSIZE);
1542 #else
1543 error = copyiniov(msg->msg_iov, msg->msg_iovlen, &iov, EMSGSIZE);
1544 #endif
1545 if (error != 0)
1546 return (error);
1547
1548 if (msg->msg_name != NULL && msg->msg_namelen > 0) {
1549 msg->msg_namelen = min(msg->msg_namelen, SOCK_MAXADDRLEN);
1550 sa = malloc(msg->msg_namelen, M_SONAME, M_WAITOK);
1551 msg->msg_name = sa;
1552 } else {
1553 sa = NULL;
1554 msg->msg_name = NULL;
1555 }
1556
1557 uiov = msg->msg_iov;
1558 msg->msg_iov = iov;
1559 controlp = (msg->msg_control != NULL) ? &control : NULL;
1560 error = kern_recvit(td, s, msg, UIO_SYSSPACE, controlp);
1561 msg->msg_iov = uiov;
1562 if (error != 0)
1563 goto bad;
1564
1565 /*
1566 * Note that kern_recvit() updates msg->msg_namelen.
1567 */
1568 if (msg->msg_name != NULL && msg->msg_namelen > 0) {
1569 msg->msg_name = PTRIN(linux_msghdr.msg_name);
1570 error = linux_copyout_sockaddr(sa,
1571 PTRIN(msg->msg_name), msg->msg_namelen);
1572 if (error != 0)
1573 goto bad;
1574 }
1575
1576 error = bsd_to_linux_msghdr(msg, &linux_msghdr);
1577 if (error != 0)
1578 goto bad;
1579
1580 maxlen = linux_msghdr.msg_controllen;
1581 linux_msghdr.msg_controllen = 0;
1582 if (control) {
1583 linux_cmsg = malloc(L_CMSG_HDRSZ, M_LINUX, M_WAITOK | M_ZERO);
1584
1585 msg->msg_control = mtod(control, struct cmsghdr *);
1586 msg->msg_controllen = control->m_len;
1587
1588 cm = CMSG_FIRSTHDR(msg);
1589 outbuf = PTRIN(linux_msghdr.msg_control);
1590 outlen = 0;
1591 while (cm != NULL) {
1592 linux_cmsg->cmsg_type =
1593 bsd_to_linux_cmsg_type(cm->cmsg_type);
1594 linux_cmsg->cmsg_level =
1595 bsd_to_linux_sockopt_level(cm->cmsg_level);
1596 if (linux_cmsg->cmsg_type == -1 ||
1597 cm->cmsg_level != SOL_SOCKET) {
1598 linux_msg(curthread,
1599 "unsupported recvmsg cmsg level %d type %d",
1600 cm->cmsg_level, cm->cmsg_type);
1601 error = EINVAL;
1602 goto bad;
1603 }
1604
1605 data = CMSG_DATA(cm);
1606 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1607
1608 switch (cm->cmsg_type) {
1609 case SCM_RIGHTS:
1610 if (flags & LINUX_MSG_CMSG_CLOEXEC) {
1611 fds = datalen / sizeof(int);
1612 fdp = data;
1613 for (i = 0; i < fds; i++) {
1614 fd = *fdp++;
1615 (void)kern_fcntl(td, fd,
1616 F_SETFD, FD_CLOEXEC);
1617 }
1618 }
1619 break;
1620
1621 case SCM_CREDS:
1622 /*
1623 * Currently LOCAL_CREDS is never in
1624 * effect for Linux so no need to worry
1625 * about sockcred
1626 */
1627 if (datalen != sizeof(*cmcred)) {
1628 error = EMSGSIZE;
1629 goto bad;
1630 }
1631 cmcred = (struct cmsgcred *)data;
1632 bzero(&linux_ucred, sizeof(linux_ucred));
1633 linux_ucred.pid = cmcred->cmcred_pid;
1634 linux_ucred.uid = cmcred->cmcred_uid;
1635 linux_ucred.gid = cmcred->cmcred_gid;
1636 data = &linux_ucred;
1637 datalen = sizeof(linux_ucred);
1638 break;
1639
1640 case SCM_CREDS2:
1641 scred = data;
1642 bzero(&linux_ucred, sizeof(linux_ucred));
1643 linux_ucred.pid = scred->sc_pid;
1644 linux_ucred.uid = scred->sc_uid;
1645 linux_ucred.gid = scred->sc_gid;
1646 data = &linux_ucred;
1647 datalen = sizeof(linux_ucred);
1648 break;
1649
1650 case SCM_TIMESTAMP:
1651 if (datalen != sizeof(struct timeval)) {
1652 error = EMSGSIZE;
1653 goto bad;
1654 }
1655 ftmvl = (struct timeval *)data;
1656 ltmvl.tv_sec = ftmvl->tv_sec;
1657 ltmvl.tv_usec = ftmvl->tv_usec;
1658 data = <mvl;
1659 datalen = sizeof(ltmvl);
1660 break;
1661 }
1662
1663 if (outlen + LINUX_CMSG_LEN(datalen) > maxlen) {
1664 if (outlen == 0) {
1665 error = EMSGSIZE;
1666 goto bad;
1667 } else {
1668 linux_msghdr.msg_flags |= LINUX_MSG_CTRUNC;
1669 m_dispose_extcontrolm(control);
1670 goto out;
1671 }
1672 }
1673
1674 linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
1675
1676 error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
1677 if (error != 0)
1678 goto bad;
1679 outbuf += L_CMSG_HDRSZ;
1680
1681 error = copyout(data, outbuf, datalen);
1682 if (error != 0)
1683 goto bad;
1684
1685 outbuf += LINUX_CMSG_ALIGN(datalen);
1686 outlen += LINUX_CMSG_LEN(datalen);
1687
1688 cm = CMSG_NXTHDR(msg, cm);
1689 }
1690 linux_msghdr.msg_controllen = outlen;
1691 }
1692
1693 out:
1694 error = copyout(&linux_msghdr, msghdr, sizeof(linux_msghdr));
1695
1696 bad:
1697 if (control != NULL) {
1698 if (error != 0)
1699 m_dispose_extcontrolm(control);
1700 m_freem(control);
1701 }
1702 free(iov, M_IOV);
1703 free(linux_cmsg, M_LINUX);
1704 free(sa, M_SONAME);
1705
1706 return (error);
1707 }
1708
1709 int
1710 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
1711 {
1712 struct msghdr bsd_msg;
1713
1714 return (linux_recvmsg_common(td, args->s, PTRIN(args->msg),
1715 args->flags, &bsd_msg));
1716 }
1717
1718 int
1719 linux_recvmmsg(struct thread *td, struct linux_recvmmsg_args *args)
1720 {
1721 struct l_mmsghdr *msg;
1722 struct msghdr bsd_msg;
1723 struct l_timespec lts;
1724 struct timespec ts, tts;
1725 l_uint retval;
1726 int error, datagrams;
1727
1728 if (args->timeout) {
1729 error = copyin(args->timeout, <s, sizeof(struct l_timespec));
1730 if (error != 0)
1731 return (error);
1732 error = linux_to_native_timespec(&ts, <s);
1733 if (error != 0)
1734 return (error);
1735 getnanotime(&tts);
1736 timespecadd(&tts, &ts, &tts);
1737 }
1738
1739 msg = PTRIN(args->msg);
1740 datagrams = 0;
1741 while (datagrams < args->vlen) {
1742 error = linux_recvmsg_common(td, args->s, &msg->msg_hdr,
1743 args->flags & ~LINUX_MSG_WAITFORONE, &bsd_msg);
1744 if (error != 0)
1745 break;
1746
1747 retval = td->td_retval[0];
1748 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len));
1749 if (error != 0)
1750 break;
1751 ++msg;
1752 ++datagrams;
1753
1754 /*
1755 * MSG_WAITFORONE turns on MSG_DONTWAIT after one packet.
1756 */
1757 if (args->flags & LINUX_MSG_WAITFORONE)
1758 args->flags |= LINUX_MSG_DONTWAIT;
1759
1760 /*
1761 * See BUGS section of recvmmsg(2).
1762 */
1763 if (args->timeout) {
1764 getnanotime(&ts);
1765 timespecsub(&ts, &tts, &ts);
1766 if (!timespecisset(&ts) || ts.tv_sec > 0)
1767 break;
1768 }
1769 /* Out of band data, return right away. */
1770 if (bsd_msg.msg_flags & MSG_OOB)
1771 break;
1772 }
1773 if (error == 0)
1774 td->td_retval[0] = datagrams;
1775 return (error);
1776 }
1777
1778 int
1779 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
1780 {
1781
1782 return (kern_shutdown(td, args->s, args->how));
1783 }
1784
1785 int
1786 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
1787 {
1788 l_timeval linux_tv;
1789 struct sockaddr *sa;
1790 struct timeval tv;
1791 socklen_t len;
1792 int error, level, name;
1793
1794 level = linux_to_bsd_sockopt_level(args->level);
1795 switch (level) {
1796 case SOL_SOCKET:
1797 name = linux_to_bsd_so_sockopt(args->optname);
1798 switch (name) {
1799 case LOCAL_CREDS_PERSISTENT:
1800 level = SOL_LOCAL;
1801 break;
1802 case SO_RCVTIMEO:
1803 /* FALLTHROUGH */
1804 case SO_SNDTIMEO:
1805 error = copyin(PTRIN(args->optval), &linux_tv,
1806 sizeof(linux_tv));
1807 if (error != 0)
1808 return (error);
1809 tv.tv_sec = linux_tv.tv_sec;
1810 tv.tv_usec = linux_tv.tv_usec;
1811 return (kern_setsockopt(td, args->s, level,
1812 name, &tv, UIO_SYSSPACE, sizeof(tv)));
1813 /* NOTREACHED */
1814 default:
1815 break;
1816 }
1817 break;
1818 case IPPROTO_IP:
1819 if (args->optname == LINUX_IP_RECVERR &&
1820 linux_ignore_ip_recverr) {
1821 /*
1822 * XXX: This is a hack to unbreak DNS resolution
1823 * with glibc 2.30 and above.
1824 */
1825 return (0);
1826 }
1827 name = linux_to_bsd_ip_sockopt(args->optname);
1828 break;
1829 case IPPROTO_IPV6:
1830 name = linux_to_bsd_ip6_sockopt(args->optname);
1831 break;
1832 case IPPROTO_TCP:
1833 name = linux_to_bsd_tcp_sockopt(args->optname);
1834 break;
1835 default:
1836 name = -1;
1837 break;
1838 }
1839 if (name < 0) {
1840 if (name == -1)
1841 linux_msg(curthread,
1842 "unsupported setsockopt level %d optname %d",
1843 args->level, args->optname);
1844 return (ENOPROTOOPT);
1845 }
1846
1847 if (name == IPV6_NEXTHOP) {
1848 len = args->optlen;
1849 error = linux_to_bsd_sockaddr(PTRIN(args->optval), &sa, &len);
1850 if (error != 0)
1851 return (error);
1852
1853 error = kern_setsockopt(td, args->s, level,
1854 name, sa, UIO_SYSSPACE, len);
1855 free(sa, M_SONAME);
1856 } else {
1857 error = kern_setsockopt(td, args->s, level,
1858 name, PTRIN(args->optval), UIO_USERSPACE, args->optlen);
1859 }
1860
1861 return (error);
1862 }
1863
1864 int
1865 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
1866 {
1867 l_timeval linux_tv;
1868 struct timeval tv;
1869 socklen_t tv_len, xulen, len;
1870 struct sockaddr *sa;
1871 struct xucred xu;
1872 struct l_ucred lxu;
1873 int error, level, name, newval;
1874
1875 level = linux_to_bsd_sockopt_level(args->level);
1876 switch (level) {
1877 case SOL_SOCKET:
1878 name = linux_to_bsd_so_sockopt(args->optname);
1879 switch (name) {
1880 case LOCAL_CREDS_PERSISTENT:
1881 level = SOL_LOCAL;
1882 break;
1883 case SO_RCVTIMEO:
1884 /* FALLTHROUGH */
1885 case SO_SNDTIMEO:
1886 tv_len = sizeof(tv);
1887 error = kern_getsockopt(td, args->s, level,
1888 name, &tv, UIO_SYSSPACE, &tv_len);
1889 if (error != 0)
1890 return (error);
1891 linux_tv.tv_sec = tv.tv_sec;
1892 linux_tv.tv_usec = tv.tv_usec;
1893 return (copyout(&linux_tv, PTRIN(args->optval),
1894 sizeof(linux_tv)));
1895 /* NOTREACHED */
1896 case LOCAL_PEERCRED:
1897 if (args->optlen < sizeof(lxu))
1898 return (EINVAL);
1899 /*
1900 * LOCAL_PEERCRED is not served at the SOL_SOCKET level,
1901 * but by the Unix socket's level 0.
1902 */
1903 level = 0;
1904 xulen = sizeof(xu);
1905 error = kern_getsockopt(td, args->s, level,
1906 name, &xu, UIO_SYSSPACE, &xulen);
1907 if (error != 0)
1908 return (error);
1909 lxu.pid = xu.cr_pid;
1910 lxu.uid = xu.cr_uid;
1911 lxu.gid = xu.cr_gid;
1912 return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
1913 /* NOTREACHED */
1914 case SO_ERROR:
1915 len = sizeof(newval);
1916 error = kern_getsockopt(td, args->s, level,
1917 name, &newval, UIO_SYSSPACE, &len);
1918 if (error != 0)
1919 return (error);
1920 newval = -bsd_to_linux_errno(newval);
1921 return (copyout(&newval, PTRIN(args->optval), len));
1922 /* NOTREACHED */
1923 default:
1924 break;
1925 }
1926 break;
1927 case IPPROTO_IP:
1928 name = linux_to_bsd_ip_sockopt(args->optname);
1929 break;
1930 case IPPROTO_IPV6:
1931 name = linux_to_bsd_ip6_sockopt(args->optname);
1932 break;
1933 case IPPROTO_TCP:
1934 name = linux_to_bsd_tcp_sockopt(args->optname);
1935 break;
1936 default:
1937 name = -1;
1938 break;
1939 }
1940 if (name < 0) {
1941 if (name == -1)
1942 linux_msg(curthread,
1943 "unsupported getsockopt level %d optname %d",
1944 args->level, args->optname);
1945 return (EINVAL);
1946 }
1947
1948 if (name == IPV6_NEXTHOP) {
1949 error = copyin(PTRIN(args->optlen), &len, sizeof(len));
1950 if (error != 0)
1951 return (error);
1952 sa = malloc(len, M_SONAME, M_WAITOK);
1953
1954 error = kern_getsockopt(td, args->s, level,
1955 name, sa, UIO_SYSSPACE, &len);
1956 if (error != 0)
1957 goto out;
1958
1959 error = linux_copyout_sockaddr(sa, PTRIN(args->optval), len);
1960 if (error == 0)
1961 error = copyout(&len, PTRIN(args->optlen),
1962 sizeof(len));
1963 out:
1964 free(sa, M_SONAME);
1965 } else {
1966 if (args->optval) {
1967 error = copyin(PTRIN(args->optlen), &len, sizeof(len));
1968 if (error != 0)
1969 return (error);
1970 }
1971 error = kern_getsockopt(td, args->s, level,
1972 name, PTRIN(args->optval), UIO_USERSPACE, &len);
1973 if (error == 0)
1974 error = copyout(&len, PTRIN(args->optlen),
1975 sizeof(len));
1976 }
1977
1978 return (error);
1979 }
1980
1981 static int
1982 linux_sendfile_common(struct thread *td, l_int out, l_int in,
1983 l_loff_t *offset, l_size_t count)
1984 {
1985 off_t bytes_read;
1986 int error;
1987 l_loff_t current_offset;
1988 struct file *fp;
1989
1990 AUDIT_ARG_FD(in);
1991 error = fget_read(td, in, &cap_pread_rights, &fp);
1992 if (error != 0)
1993 return (error);
1994
1995 if (offset != NULL) {
1996 current_offset = *offset;
1997 } else {
1998 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
1999 fo_seek(fp, 0, SEEK_CUR, td) : ESPIPE;
2000 if (error != 0)
2001 goto drop;
2002 current_offset = td->td_uretoff.tdu_off;
2003 }
2004
2005 bytes_read = 0;
2006
2007 /* Linux cannot have 0 count. */
2008 if (count <= 0 || current_offset < 0) {
2009 error = EINVAL;
2010 goto drop;
2011 }
2012
2013 error = fo_sendfile(fp, out, NULL, NULL, current_offset, count,
2014 &bytes_read, 0, td);
2015 if (error != 0)
2016 goto drop;
2017 current_offset += bytes_read;
2018
2019 if (offset != NULL) {
2020 *offset = current_offset;
2021 } else {
2022 error = fo_seek(fp, current_offset, SEEK_SET, td);
2023 if (error != 0)
2024 goto drop;
2025 }
2026
2027 td->td_retval[0] = (ssize_t)bytes_read;
2028 drop:
2029 fdrop(fp, td);
2030 return (error);
2031 }
2032
2033 int
2034 linux_sendfile(struct thread *td, struct linux_sendfile_args *arg)
2035 {
2036 /*
2037 * Differences between FreeBSD and Linux sendfile:
2038 * - Linux doesn't send anything when count is 0 (FreeBSD uses 0 to
2039 * mean send the whole file.) In linux_sendfile given fds are still
2040 * checked for validity when the count is 0.
2041 * - Linux can send to any fd whereas FreeBSD only supports sockets.
2042 * The same restriction follows for linux_sendfile.
2043 * - Linux doesn't have an equivalent for FreeBSD's flags and sf_hdtr.
2044 * - Linux takes an offset pointer and updates it to the read location.
2045 * FreeBSD takes in an offset and a 'bytes read' parameter which is
2046 * only filled if it isn't NULL. We use this parameter to update the
2047 * offset pointer if it exists.
2048 * - Linux sendfile returns bytes read on success while FreeBSD
2049 * returns 0. We use the 'bytes read' parameter to get this value.
2050 */
2051
2052 l_loff_t offset64;
2053 l_long offset;
2054 int ret;
2055 int error;
2056
2057 if (arg->offset != NULL) {
2058 error = copyin(arg->offset, &offset, sizeof(offset));
2059 if (error != 0)
2060 return (error);
2061 offset64 = (l_loff_t)offset;
2062 }
2063
2064 ret = linux_sendfile_common(td, arg->out, arg->in,
2065 arg->offset != NULL ? &offset64 : NULL, arg->count);
2066
2067 if (arg->offset != NULL) {
2068 #if defined(__i386__) || defined(__arm__) || \
2069 (defined(__amd64__) && defined(COMPAT_LINUX32))
2070 if (offset64 > INT32_MAX)
2071 return (EOVERFLOW);
2072 #endif
2073 offset = (l_long)offset64;
2074 error = copyout(&offset, arg->offset, sizeof(offset));
2075 if (error != 0)
2076 return (error);
2077 }
2078
2079 return (ret);
2080 }
2081
2082 #if defined(__i386__) || defined(__arm__) || \
2083 (defined(__amd64__) && defined(COMPAT_LINUX32))
2084
2085 int
2086 linux_sendfile64(struct thread *td, struct linux_sendfile64_args *arg)
2087 {
2088 l_loff_t offset;
2089 int ret;
2090 int error;
2091
2092 if (arg->offset != NULL) {
2093 error = copyin(arg->offset, &offset, sizeof(offset));
2094 if (error != 0)
2095 return (error);
2096 }
2097
2098 ret = linux_sendfile_common(td, arg->out, arg->in,
2099 arg->offset != NULL ? &offset : NULL, arg->count);
2100
2101 if (arg->offset != NULL) {
2102 error = copyout(&offset, arg->offset, sizeof(offset));
2103 if (error != 0)
2104 return (error);
2105 }
2106
2107 return (ret);
2108 }
2109
2110 /* Argument list sizes for linux_socketcall */
2111 static const unsigned char lxs_args_cnt[] = {
2112 0 /* unused*/, 3 /* socket */,
2113 3 /* bind */, 3 /* connect */,
2114 2 /* listen */, 3 /* accept */,
2115 3 /* getsockname */, 3 /* getpeername */,
2116 4 /* socketpair */, 4 /* send */,
2117 4 /* recv */, 6 /* sendto */,
2118 6 /* recvfrom */, 2 /* shutdown */,
2119 5 /* setsockopt */, 5 /* getsockopt */,
2120 3 /* sendmsg */, 3 /* recvmsg */,
2121 4 /* accept4 */, 5 /* recvmmsg */,
2122 4 /* sendmmsg */, 4 /* sendfile */
2123 };
2124 #define LINUX_ARGS_CNT (nitems(lxs_args_cnt) - 1)
2125 #define LINUX_ARG_SIZE(x) (lxs_args_cnt[x] * sizeof(l_ulong))
2126
2127 int
2128 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
2129 {
2130 l_ulong a[6];
2131 #if defined(__amd64__) && defined(COMPAT_LINUX32)
2132 register_t l_args[6];
2133 #endif
2134 void *arg;
2135 int error;
2136
2137 if (args->what < LINUX_SOCKET || args->what > LINUX_ARGS_CNT)
2138 return (EINVAL);
2139 error = copyin(PTRIN(args->args), a, LINUX_ARG_SIZE(args->what));
2140 if (error != 0)
2141 return (error);
2142
2143 #if defined(__amd64__) && defined(COMPAT_LINUX32)
2144 for (int i = 0; i < lxs_args_cnt[args->what]; ++i)
2145 l_args[i] = a[i];
2146 arg = l_args;
2147 #else
2148 arg = a;
2149 #endif
2150 switch (args->what) {
2151 case LINUX_SOCKET:
2152 return (linux_socket(td, arg));
2153 case LINUX_BIND:
2154 return (linux_bind(td, arg));
2155 case LINUX_CONNECT:
2156 return (linux_connect(td, arg));
2157 case LINUX_LISTEN:
2158 return (linux_listen(td, arg));
2159 case LINUX_ACCEPT:
2160 return (linux_accept(td, arg));
2161 case LINUX_GETSOCKNAME:
2162 return (linux_getsockname(td, arg));
2163 case LINUX_GETPEERNAME:
2164 return (linux_getpeername(td, arg));
2165 case LINUX_SOCKETPAIR:
2166 return (linux_socketpair(td, arg));
2167 case LINUX_SEND:
2168 return (linux_send(td, arg));
2169 case LINUX_RECV:
2170 return (linux_recv(td, arg));
2171 case LINUX_SENDTO:
2172 return (linux_sendto(td, arg));
2173 case LINUX_RECVFROM:
2174 return (linux_recvfrom(td, arg));
2175 case LINUX_SHUTDOWN:
2176 return (linux_shutdown(td, arg));
2177 case LINUX_SETSOCKOPT:
2178 return (linux_setsockopt(td, arg));
2179 case LINUX_GETSOCKOPT:
2180 return (linux_getsockopt(td, arg));
2181 case LINUX_SENDMSG:
2182 return (linux_sendmsg(td, arg));
2183 case LINUX_RECVMSG:
2184 return (linux_recvmsg(td, arg));
2185 case LINUX_ACCEPT4:
2186 return (linux_accept4(td, arg));
2187 case LINUX_RECVMMSG:
2188 return (linux_recvmmsg(td, arg));
2189 case LINUX_SENDMMSG:
2190 return (linux_sendmmsg(td, arg));
2191 case LINUX_SENDFILE:
2192 return (linux_sendfile(td, arg));
2193 }
2194
2195 linux_msg(td, "socket type %d not implemented", args->what);
2196 return (ENOSYS);
2197 }
2198 #endif /* __i386__ || __arm__ || (__amd64__ && COMPAT_LINUX32) */
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