The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_socket.c

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    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: releng/11.2/sys/compat/linux/linux_socket.c 330997 2018-03-15 12:56:22Z emaste $");
   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/limits.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mutex.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/syscallsubr.h>
   51 #include <sys/uio.h>
   52 #include <sys/syslog.h>
   53 #include <sys/un.h>
   54 
   55 #include <net/if.h>
   56 #include <net/vnet.h>
   57 #include <netinet/in.h>
   58 #include <netinet/in_systm.h>
   59 #include <netinet/ip.h>
   60 #include <netinet/tcp.h>
   61 #ifdef INET6
   62 #include <netinet/ip6.h>
   63 #include <netinet6/ip6_var.h>
   64 #endif
   65 
   66 #ifdef COMPAT_LINUX32
   67 #include <machine/../linux32/linux.h>
   68 #include <machine/../linux32/linux32_proto.h>
   69 #else
   70 #include <machine/../linux/linux.h>
   71 #include <machine/../linux/linux_proto.h>
   72 #endif
   73 #include <compat/linux/linux_file.h>
   74 #include <compat/linux/linux_socket.h>
   75 #include <compat/linux/linux_timer.h>
   76 #include <compat/linux/linux_util.h>
   77 
   78 static int linux_to_bsd_domain(int);
   79 static int linux_sendmsg_common(struct thread *, l_int, struct l_msghdr *,
   80                                         l_uint);
   81 static int linux_recvmsg_common(struct thread *, l_int, struct l_msghdr *,
   82                                         l_uint, struct msghdr *);
   83 static int linux_set_socket_flags(int, int *);
   84 
   85 /*
   86  * Reads a linux sockaddr and does any necessary translation.
   87  * Linux sockaddrs don't have a length field, only a family.
   88  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   89  * family and convert to sockaddr.
   90  */
   91 static int
   92 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int salen)
   93 {
   94         struct sockaddr *sa;
   95         struct osockaddr *kosa;
   96 #ifdef INET6
   97         struct sockaddr_in6 *sin6;
   98         int oldv6size;
   99 #endif
  100         char *name;
  101         int bdom, error, hdrlen, namelen;
  102 
  103         if (salen < 2 || salen > UCHAR_MAX || !osa)
  104                 return (EINVAL);
  105 
  106 #ifdef INET6
  107         oldv6size = 0;
  108         /*
  109          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  110          * if it's a v4-mapped address, so reserve the proper space
  111          * for it.
  112          */
  113         if (salen == sizeof(struct sockaddr_in6) - sizeof(uint32_t)) {
  114                 salen += sizeof(uint32_t);
  115                 oldv6size = 1;
  116         }
  117 #endif
  118 
  119         kosa = malloc(salen, M_SONAME, M_WAITOK);
  120 
  121         if ((error = copyin(osa, kosa, salen)))
  122                 goto out;
  123 
  124         bdom = linux_to_bsd_domain(kosa->sa_family);
  125         if (bdom == -1) {
  126                 error = EAFNOSUPPORT;
  127                 goto out;
  128         }
  129 
  130 #ifdef INET6
  131         /*
  132          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  133          * which lacks the scope id compared with RFC2553 one. If we detect
  134          * the situation, reject the address and write a message to system log.
  135          *
  136          * Still accept addresses for which the scope id is not used.
  137          */
  138         if (oldv6size) {
  139                 if (bdom == AF_INET6) {
  140                         sin6 = (struct sockaddr_in6 *)kosa;
  141                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  142                             (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  143                              !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  144                              !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  145                              !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  146                              !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  147                                 sin6->sin6_scope_id = 0;
  148                         } else {
  149                                 log(LOG_DEBUG,
  150                                     "obsolete pre-RFC2553 sockaddr_in6 rejected\n");
  151                                 error = EINVAL;
  152                                 goto out;
  153                         }
  154                 } else
  155                         salen -= sizeof(uint32_t);
  156         }
  157 #endif
  158         if (bdom == AF_INET) {
  159                 if (salen < sizeof(struct sockaddr_in)) {
  160                         error = EINVAL;
  161                         goto out;
  162                 }
  163                 salen = sizeof(struct sockaddr_in);
  164         }
  165 
  166         if (bdom == AF_LOCAL && salen > sizeof(struct sockaddr_un)) {
  167                 hdrlen = offsetof(struct sockaddr_un, sun_path);
  168                 name = ((struct sockaddr_un *)kosa)->sun_path;
  169                 if (*name == '\0') {
  170                         /*
  171                          * Linux abstract namespace starts with a NULL byte.
  172                          * XXX We do not support abstract namespace yet.
  173                          */
  174                         namelen = strnlen(name + 1, salen - hdrlen - 1) + 1;
  175                 } else
  176                         namelen = strnlen(name, salen - hdrlen);
  177                 salen = hdrlen + namelen;
  178                 if (salen > sizeof(struct sockaddr_un)) {
  179                         error = ENAMETOOLONG;
  180                         goto out;
  181                 }
  182         }
  183 
  184         sa = (struct sockaddr *)kosa;
  185         sa->sa_family = bdom;
  186         sa->sa_len = salen;
  187 
  188         *sap = sa;
  189         return (0);
  190 
  191 out:
  192         free(kosa, M_SONAME);
  193         return (error);
  194 }
  195 
  196 static int
  197 linux_to_bsd_domain(int domain)
  198 {
  199 
  200         switch (domain) {
  201         case LINUX_AF_UNSPEC:
  202                 return (AF_UNSPEC);
  203         case LINUX_AF_UNIX:
  204                 return (AF_LOCAL);
  205         case LINUX_AF_INET:
  206                 return (AF_INET);
  207         case LINUX_AF_INET6:
  208                 return (AF_INET6);
  209         case LINUX_AF_AX25:
  210                 return (AF_CCITT);
  211         case LINUX_AF_IPX:
  212                 return (AF_IPX);
  213         case LINUX_AF_APPLETALK:
  214                 return (AF_APPLETALK);
  215         }
  216         return (-1);
  217 }
  218 
  219 static int
  220 bsd_to_linux_domain(int domain)
  221 {
  222 
  223         switch (domain) {
  224         case AF_UNSPEC:
  225                 return (LINUX_AF_UNSPEC);
  226         case AF_LOCAL:
  227                 return (LINUX_AF_UNIX);
  228         case AF_INET:
  229                 return (LINUX_AF_INET);
  230         case AF_INET6:
  231                 return (LINUX_AF_INET6);
  232         case AF_CCITT:
  233                 return (LINUX_AF_AX25);
  234         case AF_IPX:
  235                 return (LINUX_AF_IPX);
  236         case AF_APPLETALK:
  237                 return (LINUX_AF_APPLETALK);
  238         }
  239         return (-1);
  240 }
  241 
  242 static int
  243 linux_to_bsd_sockopt_level(int level)
  244 {
  245 
  246         switch (level) {
  247         case LINUX_SOL_SOCKET:
  248                 return (SOL_SOCKET);
  249         }
  250         return (level);
  251 }
  252 
  253 static int
  254 bsd_to_linux_sockopt_level(int level)
  255 {
  256 
  257         switch (level) {
  258         case SOL_SOCKET:
  259                 return (LINUX_SOL_SOCKET);
  260         }
  261         return (level);
  262 }
  263 
  264 static int
  265 linux_to_bsd_ip_sockopt(int opt)
  266 {
  267 
  268         switch (opt) {
  269         case LINUX_IP_TOS:
  270                 return (IP_TOS);
  271         case LINUX_IP_TTL:
  272                 return (IP_TTL);
  273         case LINUX_IP_OPTIONS:
  274                 return (IP_OPTIONS);
  275         case LINUX_IP_MULTICAST_IF:
  276                 return (IP_MULTICAST_IF);
  277         case LINUX_IP_MULTICAST_TTL:
  278                 return (IP_MULTICAST_TTL);
  279         case LINUX_IP_MULTICAST_LOOP:
  280                 return (IP_MULTICAST_LOOP);
  281         case LINUX_IP_ADD_MEMBERSHIP:
  282                 return (IP_ADD_MEMBERSHIP);
  283         case LINUX_IP_DROP_MEMBERSHIP:
  284                 return (IP_DROP_MEMBERSHIP);
  285         case LINUX_IP_HDRINCL:
  286                 return (IP_HDRINCL);
  287         }
  288         return (-1);
  289 }
  290 
  291 static int
  292 linux_to_bsd_ip6_sockopt(int opt)
  293 {
  294 
  295         switch (opt) {
  296         case LINUX_IPV6_NEXTHOP:
  297                 return (IPV6_NEXTHOP);
  298         case LINUX_IPV6_UNICAST_HOPS:
  299                 return (IPV6_UNICAST_HOPS);
  300         case LINUX_IPV6_MULTICAST_IF:
  301                 return (IPV6_MULTICAST_IF);
  302         case LINUX_IPV6_MULTICAST_HOPS:
  303                 return (IPV6_MULTICAST_HOPS);
  304         case LINUX_IPV6_MULTICAST_LOOP:
  305                 return (IPV6_MULTICAST_LOOP);
  306         case LINUX_IPV6_ADD_MEMBERSHIP:
  307                 return (IPV6_JOIN_GROUP);
  308         case LINUX_IPV6_DROP_MEMBERSHIP:
  309                 return (IPV6_LEAVE_GROUP);
  310         case LINUX_IPV6_V6ONLY:
  311                 return (IPV6_V6ONLY);
  312         case LINUX_IPV6_DONTFRAG:
  313                 return (IPV6_DONTFRAG);
  314 #if 0
  315         case LINUX_IPV6_CHECKSUM:
  316                 return (IPV6_CHECKSUM);
  317         case LINUX_IPV6_RECVPKTINFO:
  318                 return (IPV6_RECVPKTINFO);
  319         case LINUX_IPV6_PKTINFO:
  320                 return (IPV6_PKTINFO);
  321         case LINUX_IPV6_RECVHOPLIMIT:
  322                 return (IPV6_RECVHOPLIMIT);
  323         case LINUX_IPV6_HOPLIMIT:
  324                 return (IPV6_HOPLIMIT);
  325         case LINUX_IPV6_RECVHOPOPTS:
  326                 return (IPV6_RECVHOPOPTS);
  327         case LINUX_IPV6_HOPOPTS:
  328                 return (IPV6_HOPOPTS);
  329         case LINUX_IPV6_RTHDRDSTOPTS:
  330                 return (IPV6_RTHDRDSTOPTS);
  331         case LINUX_IPV6_RECVRTHDR:
  332                 return (IPV6_RECVRTHDR);
  333         case LINUX_IPV6_RTHDR:
  334                 return (IPV6_RTHDR);
  335         case LINUX_IPV6_RECVDSTOPTS:
  336                 return (IPV6_RECVDSTOPTS);
  337         case LINUX_IPV6_DSTOPTS:
  338                 return (IPV6_DSTOPTS);
  339         case LINUX_IPV6_RECVPATHMTU:
  340                 return (IPV6_RECVPATHMTU);
  341         case LINUX_IPV6_PATHMTU:
  342                 return (IPV6_PATHMTU);
  343 #endif
  344         }
  345         return (-1);
  346 }
  347 
  348 static int
  349 linux_to_bsd_so_sockopt(int opt)
  350 {
  351 
  352         switch (opt) {
  353         case LINUX_SO_DEBUG:
  354                 return (SO_DEBUG);
  355         case LINUX_SO_REUSEADDR:
  356                 return (SO_REUSEADDR);
  357         case LINUX_SO_TYPE:
  358                 return (SO_TYPE);
  359         case LINUX_SO_ERROR:
  360                 return (SO_ERROR);
  361         case LINUX_SO_DONTROUTE:
  362                 return (SO_DONTROUTE);
  363         case LINUX_SO_BROADCAST:
  364                 return (SO_BROADCAST);
  365         case LINUX_SO_SNDBUF:
  366                 return (SO_SNDBUF);
  367         case LINUX_SO_RCVBUF:
  368                 return (SO_RCVBUF);
  369         case LINUX_SO_KEEPALIVE:
  370                 return (SO_KEEPALIVE);
  371         case LINUX_SO_OOBINLINE:
  372                 return (SO_OOBINLINE);
  373         case LINUX_SO_LINGER:
  374                 return (SO_LINGER);
  375         case LINUX_SO_PEERCRED:
  376                 return (LOCAL_PEERCRED);
  377         case LINUX_SO_RCVLOWAT:
  378                 return (SO_RCVLOWAT);
  379         case LINUX_SO_SNDLOWAT:
  380                 return (SO_SNDLOWAT);
  381         case LINUX_SO_RCVTIMEO:
  382                 return (SO_RCVTIMEO);
  383         case LINUX_SO_SNDTIMEO:
  384                 return (SO_SNDTIMEO);
  385         case LINUX_SO_TIMESTAMP:
  386                 return (SO_TIMESTAMP);
  387         case LINUX_SO_ACCEPTCONN:
  388                 return (SO_ACCEPTCONN);
  389         }
  390         return (-1);
  391 }
  392 
  393 static int
  394 linux_to_bsd_tcp_sockopt(int opt)
  395 {
  396 
  397         switch (opt) {
  398         case LINUX_TCP_NODELAY:
  399                 return (TCP_NODELAY);
  400         case LINUX_TCP_MAXSEG:
  401                 return (TCP_MAXSEG);
  402         case LINUX_TCP_KEEPIDLE:
  403                 return (TCP_KEEPIDLE);
  404         case LINUX_TCP_KEEPINTVL:
  405                 return (TCP_KEEPINTVL);
  406         case LINUX_TCP_KEEPCNT:
  407                 return (TCP_KEEPCNT);
  408         case LINUX_TCP_MD5SIG:
  409                 return (TCP_MD5SIG);
  410         }
  411         return (-1);
  412 }
  413 
  414 static int
  415 linux_to_bsd_msg_flags(int flags)
  416 {
  417         int ret_flags = 0;
  418 
  419         if (flags & LINUX_MSG_OOB)
  420                 ret_flags |= MSG_OOB;
  421         if (flags & LINUX_MSG_PEEK)
  422                 ret_flags |= MSG_PEEK;
  423         if (flags & LINUX_MSG_DONTROUTE)
  424                 ret_flags |= MSG_DONTROUTE;
  425         if (flags & LINUX_MSG_CTRUNC)
  426                 ret_flags |= MSG_CTRUNC;
  427         if (flags & LINUX_MSG_TRUNC)
  428                 ret_flags |= MSG_TRUNC;
  429         if (flags & LINUX_MSG_DONTWAIT)
  430                 ret_flags |= MSG_DONTWAIT;
  431         if (flags & LINUX_MSG_EOR)
  432                 ret_flags |= MSG_EOR;
  433         if (flags & LINUX_MSG_WAITALL)
  434                 ret_flags |= MSG_WAITALL;
  435         if (flags & LINUX_MSG_NOSIGNAL)
  436                 ret_flags |= MSG_NOSIGNAL;
  437 #if 0 /* not handled */
  438         if (flags & LINUX_MSG_PROXY)
  439                 ;
  440         if (flags & LINUX_MSG_FIN)
  441                 ;
  442         if (flags & LINUX_MSG_SYN)
  443                 ;
  444         if (flags & LINUX_MSG_CONFIRM)
  445                 ;
  446         if (flags & LINUX_MSG_RST)
  447                 ;
  448         if (flags & LINUX_MSG_ERRQUEUE)
  449                 ;
  450 #endif
  451         return (ret_flags);
  452 }
  453 
  454 /*
  455 * If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
  456 * native syscall will fault.  Thus, we don't really need to check the
  457 * return values for these functions.
  458 */
  459 
  460 static int
  461 bsd_to_linux_sockaddr(struct sockaddr *arg)
  462 {
  463         struct sockaddr sa;
  464         size_t sa_len = sizeof(struct sockaddr);
  465         int error, bdom;
  466 
  467         if ((error = copyin(arg, &sa, sa_len)))
  468                 return (error);
  469 
  470         bdom = bsd_to_linux_domain(sa.sa_family);
  471         if (bdom == -1)
  472                 return (EAFNOSUPPORT);
  473 
  474         *(u_short *)&sa = bdom;
  475         return (copyout(&sa, arg, sa_len));
  476 }
  477 
  478 static int
  479 linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
  480 {
  481         struct sockaddr sa;
  482         size_t sa_len = sizeof(struct sockaddr);
  483         int error, bdom;
  484 
  485         if ((error = copyin(arg, &sa, sa_len)))
  486                 return (error);
  487 
  488         bdom = linux_to_bsd_domain(*(sa_family_t *)&sa);
  489         if (bdom == -1)
  490                 return (EAFNOSUPPORT);
  491 
  492         sa.sa_family = bdom;
  493         sa.sa_len = len;
  494         return (copyout(&sa, arg, sa_len));
  495 }
  496 
  497 static int
  498 linux_sa_put(struct osockaddr *osa)
  499 {
  500         struct osockaddr sa;
  501         int error, bdom;
  502 
  503         /*
  504          * Only read/write the osockaddr family part, the rest is
  505          * not changed.
  506          */
  507         error = copyin(osa, &sa, sizeof(sa.sa_family));
  508         if (error != 0)
  509                 return (error);
  510 
  511         bdom = bsd_to_linux_domain(sa.sa_family);
  512         if (bdom == -1)
  513                 return (EINVAL);
  514 
  515         sa.sa_family = bdom;
  516         return (copyout(&sa, osa, sizeof(sa.sa_family)));
  517 }
  518 
  519 static int
  520 linux_to_bsd_cmsg_type(int cmsg_type)
  521 {
  522 
  523         switch (cmsg_type) {
  524         case LINUX_SCM_RIGHTS:
  525                 return (SCM_RIGHTS);
  526         case LINUX_SCM_CREDENTIALS:
  527                 return (SCM_CREDS);
  528         }
  529         return (-1);
  530 }
  531 
  532 static int
  533 bsd_to_linux_cmsg_type(int cmsg_type)
  534 {
  535 
  536         switch (cmsg_type) {
  537         case SCM_RIGHTS:
  538                 return (LINUX_SCM_RIGHTS);
  539         case SCM_CREDS:
  540                 return (LINUX_SCM_CREDENTIALS);
  541         case SCM_TIMESTAMP:
  542                 return (LINUX_SCM_TIMESTAMP);
  543         }
  544         return (-1);
  545 }
  546 
  547 static int
  548 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
  549 {
  550         if (lhdr->msg_controllen > INT_MAX)
  551                 return (ENOBUFS);
  552 
  553         bhdr->msg_name          = PTRIN(lhdr->msg_name);
  554         bhdr->msg_namelen       = lhdr->msg_namelen;
  555         bhdr->msg_iov           = PTRIN(lhdr->msg_iov);
  556         bhdr->msg_iovlen        = lhdr->msg_iovlen;
  557         bhdr->msg_control       = PTRIN(lhdr->msg_control);
  558 
  559         /*
  560          * msg_controllen is skipped since BSD and LINUX control messages
  561          * are potentially different sizes (e.g. the cred structure used
  562          * by SCM_CREDS is different between the two operating system).
  563          *
  564          * The caller can set it (if necessary) after converting all the
  565          * control messages.
  566          */
  567 
  568         bhdr->msg_flags         = linux_to_bsd_msg_flags(lhdr->msg_flags);
  569         return (0);
  570 }
  571 
  572 static int
  573 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
  574 {
  575         lhdr->msg_name          = PTROUT(bhdr->msg_name);
  576         lhdr->msg_namelen       = bhdr->msg_namelen;
  577         lhdr->msg_iov           = PTROUT(bhdr->msg_iov);
  578         lhdr->msg_iovlen        = bhdr->msg_iovlen;
  579         lhdr->msg_control       = PTROUT(bhdr->msg_control);
  580 
  581         /*
  582          * msg_controllen is skipped since BSD and LINUX control messages
  583          * are potentially different sizes (e.g. the cred structure used
  584          * by SCM_CREDS is different between the two operating system).
  585          *
  586          * The caller can set it (if necessary) after converting all the
  587          * control messages.
  588          */
  589 
  590         /* msg_flags skipped */
  591         return (0);
  592 }
  593 
  594 static int
  595 linux_set_socket_flags(int lflags, int *flags)
  596 {
  597 
  598         if (lflags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  599                 return (EINVAL);
  600         if (lflags & LINUX_SOCK_NONBLOCK)
  601                 *flags |= SOCK_NONBLOCK;
  602         if (lflags & LINUX_SOCK_CLOEXEC)
  603                 *flags |= SOCK_CLOEXEC;
  604         return (0);
  605 }
  606 
  607 static int
  608 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  609     struct mbuf *control, enum uio_seg segflg)
  610 {
  611         struct sockaddr *to;
  612         int error;
  613 
  614         if (mp->msg_name != NULL) {
  615                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  616                 if (error != 0)
  617                         return (error);
  618                 mp->msg_name = to;
  619         } else
  620                 to = NULL;
  621 
  622         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  623             segflg);
  624 
  625         if (to)
  626                 free(to, M_SONAME);
  627         return (error);
  628 }
  629 
  630 /* Return 0 if IP_HDRINCL is set for the given socket. */
  631 static int
  632 linux_check_hdrincl(struct thread *td, int s)
  633 {
  634         int error, optval;
  635         socklen_t size_val;
  636 
  637         size_val = sizeof(optval);
  638         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  639             &optval, UIO_SYSSPACE, &size_val);
  640         if (error != 0)
  641                 return (error);
  642 
  643         return (optval == 0);
  644 }
  645 
  646 /*
  647  * Updated sendto() when IP_HDRINCL is set:
  648  * tweak endian-dependent fields in the IP packet.
  649  */
  650 static int
  651 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  652 {
  653 /*
  654  * linux_ip_copysize defines how many bytes we should copy
  655  * from the beginning of the IP packet before we customize it for BSD.
  656  * It should include all the fields we modify (ip_len and ip_off).
  657  */
  658 #define linux_ip_copysize       8
  659 
  660         struct ip *packet;
  661         struct msghdr msg;
  662         struct iovec aiov[1];
  663         int error;
  664 
  665         /* Check that the packet isn't too big or too small. */
  666         if (linux_args->len < linux_ip_copysize ||
  667             linux_args->len > IP_MAXPACKET)
  668                 return (EINVAL);
  669 
  670         packet = (struct ip *)malloc(linux_args->len, M_LINUX, M_WAITOK);
  671 
  672         /* Make kernel copy of the packet to be sent */
  673         if ((error = copyin(PTRIN(linux_args->msg), packet,
  674             linux_args->len)))
  675                 goto goout;
  676 
  677         /* Convert fields from Linux to BSD raw IP socket format */
  678         packet->ip_len = linux_args->len;
  679         packet->ip_off = ntohs(packet->ip_off);
  680 
  681         /* Prepare the msghdr and iovec structures describing the new packet */
  682         msg.msg_name = PTRIN(linux_args->to);
  683         msg.msg_namelen = linux_args->tolen;
  684         msg.msg_iov = aiov;
  685         msg.msg_iovlen = 1;
  686         msg.msg_control = NULL;
  687         msg.msg_flags = 0;
  688         aiov[0].iov_base = (char *)packet;
  689         aiov[0].iov_len = linux_args->len;
  690         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  691             NULL, UIO_SYSSPACE);
  692 goout:
  693         free(packet, M_LINUX);
  694         return (error);
  695 }
  696 
  697 int
  698 linux_socket(struct thread *td, struct linux_socket_args *args)
  699 {
  700         int domain, retval_socket, type;
  701 
  702         type = args->type & LINUX_SOCK_TYPE_MASK;
  703         if (type < 0 || type > LINUX_SOCK_MAX)
  704                 return (EINVAL);
  705         retval_socket = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK,
  706                 &type);
  707         if (retval_socket != 0)
  708                 return (retval_socket);
  709         domain = linux_to_bsd_domain(args->domain);
  710         if (domain == -1)
  711                 return (EAFNOSUPPORT);
  712 
  713         retval_socket = kern_socket(td, domain, type, args->protocol);
  714         if (retval_socket)
  715                 return (retval_socket);
  716 
  717         if (type == SOCK_RAW
  718             && (args->protocol == IPPROTO_RAW || args->protocol == 0)
  719             && domain == PF_INET) {
  720                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  721                 int hdrincl;
  722 
  723                 hdrincl = 1;
  724                 /* We ignore any error returned by kern_setsockopt() */
  725                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  726                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  727         }
  728 #ifdef INET6
  729         /*
  730          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
  731          * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
  732          * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
  733          * sysctl value.
  734          */
  735         if (domain == PF_INET6) {
  736                 int v6only;
  737 
  738                 v6only = 0;
  739                 /* We ignore any error returned by setsockopt() */
  740                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  741                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  742         }
  743 #endif
  744 
  745         return (retval_socket);
  746 }
  747 
  748 int
  749 linux_bind(struct thread *td, struct linux_bind_args *args)
  750 {
  751         struct sockaddr *sa;
  752         int error;
  753 
  754         error = linux_getsockaddr(&sa, PTRIN(args->name),
  755             args->namelen);
  756         if (error != 0)
  757                 return (error);
  758 
  759         error = kern_bindat(td, AT_FDCWD, args->s, sa);
  760         free(sa, M_SONAME);
  761         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  762                 return (EINVAL);
  763         return (error);
  764 }
  765 
  766 int
  767 linux_connect(struct thread *td, struct linux_connect_args *args)
  768 {
  769         cap_rights_t rights;
  770         struct socket *so;
  771         struct sockaddr *sa;
  772         struct file *fp;
  773         u_int fflag;
  774         int error;
  775 
  776         error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
  777             args->namelen);
  778         if (error != 0)
  779                 return (error);
  780 
  781         error = kern_connectat(td, AT_FDCWD, args->s, sa);
  782         free(sa, M_SONAME);
  783         if (error != EISCONN)
  784                 return (error);
  785 
  786         /*
  787          * Linux doesn't return EISCONN the first time it occurs,
  788          * when on a non-blocking socket. Instead it returns the
  789          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  790          */
  791         error = getsock_cap(td, args->s, cap_rights_init(&rights, CAP_CONNECT),
  792             &fp, &fflag, NULL);
  793         if (error != 0)
  794                 return (error);
  795 
  796         error = EISCONN;
  797         so = fp->f_data;
  798         if (fflag & FNONBLOCK) {
  799                 SOCK_LOCK(so);
  800                 if (so->so_emuldata == 0)
  801                         error = so->so_error;
  802                 so->so_emuldata = (void *)1;
  803                 SOCK_UNLOCK(so);
  804         }
  805         fdrop(fp, td);
  806 
  807         return (error);
  808 }
  809 
  810 int
  811 linux_listen(struct thread *td, struct linux_listen_args *args)
  812 {
  813 
  814         return (kern_listen(td, args->s, args->backlog));
  815 }
  816 
  817 static int
  818 linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
  819     l_uintptr_t namelen, int flags)
  820 {
  821         struct accept4_args /* {
  822                 int     s;
  823                 struct sockaddr * __restrict name;
  824                 socklen_t * __restrict anamelen;
  825                 int     flags;
  826         } */ bsd_args;
  827         cap_rights_t rights;
  828         struct socket *so;
  829         struct file *fp;
  830         int error, error1;
  831 
  832         bsd_args.s = s;
  833         bsd_args.name = (struct sockaddr * __restrict)PTRIN(addr);
  834         bsd_args.anamelen = PTRIN(namelen);
  835         bsd_args.flags = 0;
  836         error = linux_set_socket_flags(flags, &bsd_args.flags);
  837         if (error != 0)
  838                 return (error);
  839         error = sys_accept4(td, &bsd_args);
  840         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
  841         if (error != 0) {
  842                 if (error == EFAULT && namelen != sizeof(struct sockaddr_in))
  843                         return (EINVAL);
  844                 if (error == EINVAL) {
  845                         error1 = getsock_cap(td, s,
  846                             cap_rights_init(&rights, CAP_ACCEPT), &fp, NULL, NULL);
  847                         if (error1 != 0)
  848                                 return (error1);
  849                         so = fp->f_data;
  850                         if (so->so_type == SOCK_DGRAM) {
  851                                 fdrop(fp, td);
  852                                 return (EOPNOTSUPP);
  853                         }
  854                         fdrop(fp, td);
  855                 }
  856                 return (error);
  857         }
  858         if (addr)
  859                 error = linux_sa_put(PTRIN(addr));
  860         if (error != 0) {
  861                 (void)kern_close(td, td->td_retval[0]);
  862                 td->td_retval[0] = 0;
  863         }
  864         return (error);
  865 }
  866 
  867 int
  868 linux_accept(struct thread *td, struct linux_accept_args *args)
  869 {
  870 
  871         return (linux_accept_common(td, args->s, args->addr,
  872             args->namelen, 0));
  873 }
  874 
  875 int
  876 linux_accept4(struct thread *td, struct linux_accept4_args *args)
  877 {
  878 
  879         return (linux_accept_common(td, args->s, args->addr,
  880             args->namelen, args->flags));
  881 }
  882 
  883 int
  884 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  885 {
  886         struct getsockname_args /* {
  887                 int     fdes;
  888                 struct sockaddr * __restrict asa;
  889                 socklen_t * __restrict alen;
  890         } */ bsd_args;
  891         int error;
  892 
  893         bsd_args.fdes = args->s;
  894         bsd_args.asa = (struct sockaddr * __restrict)PTRIN(args->addr);
  895         bsd_args.alen = PTRIN(args->namelen);
  896         error = sys_getsockname(td, &bsd_args);
  897         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  898         if (error != 0)
  899                 return (error);
  900         return (linux_sa_put(PTRIN(args->addr)));
  901 }
  902 
  903 int
  904 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  905 {
  906         struct getpeername_args /* {
  907                 int fdes;
  908                 caddr_t asa;
  909                 int *alen;
  910         } */ bsd_args;
  911         int error;
  912 
  913         bsd_args.fdes = args->s;
  914         bsd_args.asa = (struct sockaddr *)PTRIN(args->addr);
  915         bsd_args.alen = (socklen_t *)PTRIN(args->namelen);
  916         error = sys_getpeername(td, &bsd_args);
  917         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  918         if (error != 0)
  919                 return (error);
  920         return (linux_sa_put(PTRIN(args->addr)));
  921 }
  922 
  923 int
  924 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  925 {
  926         struct socketpair_args /* {
  927                 int domain;
  928                 int type;
  929                 int protocol;
  930                 int *rsv;
  931         } */ bsd_args;
  932         int error;
  933 
  934         bsd_args.domain = linux_to_bsd_domain(args->domain);
  935         if (bsd_args.domain != PF_LOCAL)
  936                 return (EAFNOSUPPORT);
  937         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  938         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  939                 return (EINVAL);
  940         error = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK,
  941                 &bsd_args.type);
  942         if (error != 0)
  943                 return (error);
  944         if (args->protocol != 0 && args->protocol != PF_UNIX)
  945 
  946                 /*
  947                  * Use of PF_UNIX as protocol argument is not right,
  948                  * but Linux does it.
  949                  * Do not map PF_UNIX as its Linux value is identical
  950                  * to FreeBSD one.
  951                  */
  952                 return (EPROTONOSUPPORT);
  953         else
  954                 bsd_args.protocol = 0;
  955         bsd_args.rsv = (int *)PTRIN(args->rsv);
  956         return (sys_socketpair(td, &bsd_args));
  957 }
  958 
  959 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  960 struct linux_send_args {
  961         register_t s;
  962         register_t msg;
  963         register_t len;
  964         register_t flags;
  965 };
  966 
  967 static int
  968 linux_send(struct thread *td, struct linux_send_args *args)
  969 {
  970         struct sendto_args /* {
  971                 int s;
  972                 caddr_t buf;
  973                 int len;
  974                 int flags;
  975                 caddr_t to;
  976                 int tolen;
  977         } */ bsd_args;
  978 
  979         bsd_args.s = args->s;
  980         bsd_args.buf = (caddr_t)PTRIN(args->msg);
  981         bsd_args.len = args->len;
  982         bsd_args.flags = args->flags;
  983         bsd_args.to = NULL;
  984         bsd_args.tolen = 0;
  985         return (sys_sendto(td, &bsd_args));
  986 }
  987 
  988 struct linux_recv_args {
  989         register_t s;
  990         register_t msg;
  991         register_t len;
  992         register_t flags;
  993 };
  994 
  995 static int
  996 linux_recv(struct thread *td, struct linux_recv_args *args)
  997 {
  998         struct recvfrom_args /* {
  999                 int s;
 1000                 caddr_t buf;
 1001                 int len;
 1002                 int flags;
 1003                 struct sockaddr *from;
 1004                 socklen_t fromlenaddr;
 1005         } */ bsd_args;
 1006 
 1007         bsd_args.s = args->s;
 1008         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1009         bsd_args.len = args->len;
 1010         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1011         bsd_args.from = NULL;
 1012         bsd_args.fromlenaddr = 0;
 1013         return (sys_recvfrom(td, &bsd_args));
 1014 }
 1015 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1016 
 1017 int
 1018 linux_sendto(struct thread *td, struct linux_sendto_args *args)
 1019 {
 1020         struct msghdr msg;
 1021         struct iovec aiov;
 1022 
 1023         if (linux_check_hdrincl(td, args->s) == 0)
 1024                 /* IP_HDRINCL set, tweak the packet before sending */
 1025                 return (linux_sendto_hdrincl(td, args));
 1026 
 1027         msg.msg_name = PTRIN(args->to);
 1028         msg.msg_namelen = args->tolen;
 1029         msg.msg_iov = &aiov;
 1030         msg.msg_iovlen = 1;
 1031         msg.msg_control = NULL;
 1032         msg.msg_flags = 0;
 1033         aiov.iov_base = PTRIN(args->msg);
 1034         aiov.iov_len = args->len;
 1035         return (linux_sendit(td, args->s, &msg, args->flags, NULL,
 1036             UIO_USERSPACE));
 1037 }
 1038 
 1039 int
 1040 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
 1041 {
 1042         struct msghdr msg;
 1043         struct iovec aiov;
 1044         int error, fromlen;
 1045 
 1046         if (PTRIN(args->fromlen) != NULL) {
 1047                 error = copyin(PTRIN(args->fromlen), &fromlen,
 1048                     sizeof(fromlen));
 1049                 if (error != 0)
 1050                         return (error);
 1051                 if (fromlen < 0)
 1052                         return (EINVAL);
 1053                 msg.msg_namelen = fromlen;
 1054         } else
 1055                 msg.msg_namelen = 0;
 1056 
 1057         msg.msg_name = (struct sockaddr * __restrict)PTRIN(args->from);
 1058         msg.msg_iov = &aiov;
 1059         msg.msg_iovlen = 1;
 1060         aiov.iov_base = PTRIN(args->buf);
 1061         aiov.iov_len = args->len;
 1062         msg.msg_control = 0;
 1063         msg.msg_flags = linux_to_bsd_msg_flags(args->flags);
 1064 
 1065         error = kern_recvit(td, args->s, &msg, UIO_USERSPACE, NULL);
 1066         if (error != 0)
 1067                 return (error);
 1068 
 1069         if (PTRIN(args->from) != NULL) {
 1070                 error = bsd_to_linux_sockaddr((struct sockaddr *)
 1071                     PTRIN(args->from));
 1072                 if (error != 0)
 1073                         return (error);
 1074 
 1075                 error = linux_sa_put((struct osockaddr *)
 1076                     PTRIN(args->from));
 1077         }
 1078 
 1079         if (PTRIN(args->fromlen) != NULL)
 1080                 error = copyout(&msg.msg_namelen, PTRIN(args->fromlen),
 1081                     sizeof(msg.msg_namelen));
 1082 
 1083         return (error);
 1084 }
 1085 
 1086 static int
 1087 linux_sendmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
 1088     l_uint flags)
 1089 {
 1090         struct cmsghdr *cmsg;
 1091         struct cmsgcred cmcred;
 1092         struct mbuf *control;
 1093         struct msghdr msg;
 1094         struct l_cmsghdr linux_cmsg;
 1095         struct l_cmsghdr *ptr_cmsg;
 1096         struct l_msghdr linux_msg;
 1097         struct iovec *iov;
 1098         socklen_t datalen;
 1099         struct sockaddr *sa;
 1100         sa_family_t sa_family;
 1101         void *data;
 1102         int error;
 1103 
 1104         error = copyin(msghdr, &linux_msg, sizeof(linux_msg));
 1105         if (error != 0)
 1106                 return (error);
 1107 
 1108         /*
 1109          * Some Linux applications (ping) define a non-NULL control data
 1110          * pointer, but a msg_controllen of 0, which is not allowed in the
 1111          * FreeBSD system call interface.  NULL the msg_control pointer in
 1112          * order to handle this case.  This should be checked, but allows the
 1113          * Linux ping to work.
 1114          */
 1115         if (PTRIN(linux_msg.msg_control) != NULL && linux_msg.msg_controllen == 0)
 1116                 linux_msg.msg_control = PTROUT(NULL);
 1117 
 1118         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1119         if (error != 0)
 1120                 return (error);
 1121 
 1122 #ifdef COMPAT_LINUX32
 1123         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1124             &iov, EMSGSIZE);
 1125 #else
 1126         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1127 #endif
 1128         if (error != 0)
 1129                 return (error);
 1130 
 1131         control = NULL;
 1132         cmsg = NULL;
 1133 
 1134         if ((ptr_cmsg = LINUX_CMSG_FIRSTHDR(&linux_msg)) != NULL) {
 1135                 error = kern_getsockname(td, s, &sa, &datalen);
 1136                 if (error != 0)
 1137                         goto bad;
 1138                 sa_family = sa->sa_family;
 1139                 free(sa, M_SONAME);
 1140 
 1141                 error = ENOBUFS;
 1142                 cmsg = malloc(CMSG_HDRSZ, M_LINUX, M_WAITOK|M_ZERO);
 1143                 control = m_get(M_WAITOK, MT_CONTROL);
 1144 
 1145                 do {
 1146                         error = copyin(ptr_cmsg, &linux_cmsg,
 1147                             sizeof(struct l_cmsghdr));
 1148                         if (error != 0)
 1149                                 goto bad;
 1150 
 1151                         error = EINVAL;
 1152                         if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr))
 1153                                 goto bad;
 1154 
 1155                         /*
 1156                          * Now we support only SCM_RIGHTS and SCM_CRED,
 1157                          * so return EINVAL in any other cmsg_type
 1158                          */
 1159                         cmsg->cmsg_type =
 1160                             linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
 1161                         cmsg->cmsg_level =
 1162                             linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
 1163                         if (cmsg->cmsg_type == -1
 1164                             || cmsg->cmsg_level != SOL_SOCKET)
 1165                                 goto bad;
 1166 
 1167                         /*
 1168                          * Some applications (e.g. pulseaudio) attempt to
 1169                          * send ancillary data even if the underlying protocol
 1170                          * doesn't support it which is not allowed in the
 1171                          * FreeBSD system call interface.
 1172                          */
 1173                         if (sa_family != AF_UNIX)
 1174                                 continue;
 1175 
 1176                         data = LINUX_CMSG_DATA(ptr_cmsg);
 1177                         datalen = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
 1178 
 1179                         switch (cmsg->cmsg_type)
 1180                         {
 1181                         case SCM_RIGHTS:
 1182                                 break;
 1183 
 1184                         case SCM_CREDS:
 1185                                 data = &cmcred;
 1186                                 datalen = sizeof(cmcred);
 1187 
 1188                                 /*
 1189                                  * The lower levels will fill in the structure
 1190                                  */
 1191                                 bzero(data, datalen);
 1192                                 break;
 1193                         }
 1194 
 1195                         cmsg->cmsg_len = CMSG_LEN(datalen);
 1196 
 1197                         error = ENOBUFS;
 1198                         if (!m_append(control, CMSG_HDRSZ, (c_caddr_t)cmsg))
 1199                                 goto bad;
 1200                         if (!m_append(control, datalen, (c_caddr_t)data))
 1201                                 goto bad;
 1202                 } while ((ptr_cmsg = LINUX_CMSG_NXTHDR(&linux_msg, ptr_cmsg)));
 1203 
 1204                 if (m_length(control, NULL) == 0) {
 1205                         m_freem(control);
 1206                         control = NULL;
 1207                 }
 1208         }
 1209 
 1210         msg.msg_iov = iov;
 1211         msg.msg_flags = 0;
 1212         error = linux_sendit(td, s, &msg, flags, control, UIO_USERSPACE);
 1213         control = NULL;
 1214 
 1215 bad:
 1216         m_freem(control);
 1217         free(iov, M_IOV);
 1218         if (cmsg)
 1219                 free(cmsg, M_LINUX);
 1220         return (error);
 1221 }
 1222 
 1223 int
 1224 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
 1225 {
 1226 
 1227         return (linux_sendmsg_common(td, args->s, PTRIN(args->msg),
 1228             args->flags));
 1229 }
 1230 
 1231 int
 1232 linux_sendmmsg(struct thread *td, struct linux_sendmmsg_args *args)
 1233 {
 1234         struct l_mmsghdr *msg;
 1235         l_uint retval;
 1236         int error, datagrams;
 1237 
 1238         if (args->vlen > UIO_MAXIOV)
 1239                 args->vlen = UIO_MAXIOV;
 1240 
 1241         msg = PTRIN(args->msg);
 1242         datagrams = 0;
 1243         while (datagrams < args->vlen) {
 1244                 error = linux_sendmsg_common(td, args->s, &msg->msg_hdr,
 1245                     args->flags);
 1246                 if (error != 0)
 1247                         break;
 1248 
 1249                 retval = td->td_retval[0];
 1250                 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len));
 1251                 if (error != 0)
 1252                         break;
 1253                 ++msg;
 1254                 ++datagrams;
 1255         }
 1256         if (error == 0)
 1257                 td->td_retval[0] = datagrams;
 1258         return (error);
 1259 }
 1260 
 1261 static int
 1262 linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
 1263     l_uint flags, struct msghdr *msg)
 1264 {
 1265         struct cmsghdr *cm;
 1266         struct cmsgcred *cmcred;
 1267         struct l_cmsghdr *linux_cmsg = NULL;
 1268         struct l_ucred linux_ucred;
 1269         socklen_t datalen, outlen;
 1270         struct l_msghdr linux_msg;
 1271         struct iovec *iov, *uiov;
 1272         struct mbuf *control = NULL;
 1273         struct mbuf **controlp;
 1274         struct timeval *ftmvl;
 1275         l_timeval ltmvl;
 1276         caddr_t outbuf;
 1277         void *data;
 1278         int error, i, fd, fds, *fdp;
 1279 
 1280         error = copyin(msghdr, &linux_msg, sizeof(linux_msg));
 1281         if (error != 0)
 1282                 return (error);
 1283 
 1284         error = linux_to_bsd_msghdr(msg, &linux_msg);
 1285         if (error != 0)
 1286                 return (error);
 1287 
 1288 #ifdef COMPAT_LINUX32
 1289         error = linux32_copyiniov(PTRIN(msg->msg_iov), msg->msg_iovlen,
 1290             &iov, EMSGSIZE);
 1291 #else
 1292         error = copyiniov(msg->msg_iov, msg->msg_iovlen, &iov, EMSGSIZE);
 1293 #endif
 1294         if (error != 0)
 1295                 return (error);
 1296 
 1297         if (msg->msg_name) {
 1298                 error = linux_to_bsd_sockaddr((struct sockaddr *)msg->msg_name,
 1299                     msg->msg_namelen);
 1300                 if (error != 0)
 1301                         goto bad;
 1302         }
 1303 
 1304         uiov = msg->msg_iov;
 1305         msg->msg_iov = iov;
 1306         controlp = (msg->msg_control != NULL) ? &control : NULL;
 1307         error = kern_recvit(td, s, msg, UIO_USERSPACE, controlp);
 1308         msg->msg_iov = uiov;
 1309         if (error != 0)
 1310                 goto bad;
 1311 
 1312         error = bsd_to_linux_msghdr(msg, &linux_msg);
 1313         if (error != 0)
 1314                 goto bad;
 1315 
 1316         if (linux_msg.msg_name) {
 1317                 error = bsd_to_linux_sockaddr((struct sockaddr *)
 1318                     PTRIN(linux_msg.msg_name));
 1319                 if (error != 0)
 1320                         goto bad;
 1321         }
 1322         if (linux_msg.msg_name && linux_msg.msg_namelen > 2) {
 1323                 error = linux_sa_put(PTRIN(linux_msg.msg_name));
 1324                 if (error != 0)
 1325                         goto bad;
 1326         }
 1327 
 1328         outbuf = PTRIN(linux_msg.msg_control);
 1329         outlen = 0;
 1330 
 1331         if (control) {
 1332                 linux_cmsg = malloc(L_CMSG_HDRSZ, M_LINUX, M_WAITOK | M_ZERO);
 1333 
 1334                 msg->msg_control = mtod(control, struct cmsghdr *);
 1335                 msg->msg_controllen = control->m_len;
 1336 
 1337                 cm = CMSG_FIRSTHDR(msg);
 1338 
 1339                 while (cm != NULL) {
 1340                         linux_cmsg->cmsg_type =
 1341                             bsd_to_linux_cmsg_type(cm->cmsg_type);
 1342                         linux_cmsg->cmsg_level =
 1343                             bsd_to_linux_sockopt_level(cm->cmsg_level);
 1344                         if (linux_cmsg->cmsg_type == -1
 1345                             || cm->cmsg_level != SOL_SOCKET)
 1346                         {
 1347                                 error = EINVAL;
 1348                                 goto bad;
 1349                         }
 1350 
 1351                         data = CMSG_DATA(cm);
 1352                         datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1353 
 1354                         switch (cm->cmsg_type)
 1355                         {
 1356                         case SCM_RIGHTS:
 1357                                 if (flags & LINUX_MSG_CMSG_CLOEXEC) {
 1358                                         fds = datalen / sizeof(int);
 1359                                         fdp = data;
 1360                                         for (i = 0; i < fds; i++) {
 1361                                                 fd = *fdp++;
 1362                                                 (void)kern_fcntl(td, fd,
 1363                                                     F_SETFD, FD_CLOEXEC);
 1364                                         }
 1365                                 }
 1366                                 break;
 1367 
 1368                         case SCM_CREDS:
 1369                                 /*
 1370                                  * Currently LOCAL_CREDS is never in
 1371                                  * effect for Linux so no need to worry
 1372                                  * about sockcred
 1373                                  */
 1374                                 if (datalen != sizeof(*cmcred)) {
 1375                                         error = EMSGSIZE;
 1376                                         goto bad;
 1377                                 }
 1378                                 cmcred = (struct cmsgcred *)data;
 1379                                 bzero(&linux_ucred, sizeof(linux_ucred));
 1380                                 linux_ucred.pid = cmcred->cmcred_pid;
 1381                                 linux_ucred.uid = cmcred->cmcred_uid;
 1382                                 linux_ucred.gid = cmcred->cmcred_gid;
 1383                                 data = &linux_ucred;
 1384                                 datalen = sizeof(linux_ucred);
 1385                                 break;
 1386 
 1387                         case SCM_TIMESTAMP:
 1388                                 if (datalen != sizeof(struct timeval)) {
 1389                                         error = EMSGSIZE;
 1390                                         goto bad;
 1391                                 }
 1392                                 ftmvl = (struct timeval *)data;
 1393                                 ltmvl.tv_sec = ftmvl->tv_sec;
 1394                                 ltmvl.tv_usec = ftmvl->tv_usec;
 1395                                 data = &ltmvl;
 1396                                 datalen = sizeof(ltmvl);
 1397                                 break;
 1398                         }
 1399 
 1400                         if (outlen + LINUX_CMSG_LEN(datalen) >
 1401                             linux_msg.msg_controllen) {
 1402                                 if (outlen == 0) {
 1403                                         error = EMSGSIZE;
 1404                                         goto bad;
 1405                                 } else {
 1406                                         linux_msg.msg_flags |=
 1407                                             LINUX_MSG_CTRUNC;
 1408                                         goto out;
 1409                                 }
 1410                         }
 1411 
 1412                         linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
 1413 
 1414                         error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
 1415                         if (error != 0)
 1416                                 goto bad;
 1417                         outbuf += L_CMSG_HDRSZ;
 1418 
 1419                         error = copyout(data, outbuf, datalen);
 1420                         if (error != 0)
 1421                                 goto bad;
 1422 
 1423                         outbuf += LINUX_CMSG_ALIGN(datalen);
 1424                         outlen += LINUX_CMSG_LEN(datalen);
 1425 
 1426                         cm = CMSG_NXTHDR(msg, cm);
 1427                 }
 1428         }
 1429 
 1430 out:
 1431         linux_msg.msg_controllen = outlen;
 1432         error = copyout(&linux_msg, msghdr, sizeof(linux_msg));
 1433 
 1434 bad:
 1435         free(iov, M_IOV);
 1436         m_freem(control);
 1437         free(linux_cmsg, M_LINUX);
 1438 
 1439         return (error);
 1440 }
 1441 
 1442 int
 1443 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
 1444 {
 1445         struct msghdr bsd_msg;
 1446 
 1447         return (linux_recvmsg_common(td, args->s, PTRIN(args->msg),
 1448             args->flags, &bsd_msg));
 1449 }
 1450 
 1451 int
 1452 linux_recvmmsg(struct thread *td, struct linux_recvmmsg_args *args)
 1453 {
 1454         struct l_mmsghdr *msg;
 1455         struct msghdr bsd_msg;
 1456         struct l_timespec lts;
 1457         struct timespec ts, tts;
 1458         l_uint retval;
 1459         int error, datagrams;
 1460 
 1461         if (args->timeout) {
 1462                 error = copyin(args->timeout, &lts, sizeof(struct l_timespec));
 1463                 if (error != 0)
 1464                         return (error);
 1465                 error = linux_to_native_timespec(&ts, &lts);
 1466                 if (error != 0)
 1467                         return (error);
 1468                 getnanotime(&tts);
 1469                 timespecadd(&tts, &ts);
 1470         }
 1471 
 1472         msg = PTRIN(args->msg);
 1473         datagrams = 0;
 1474         while (datagrams < args->vlen) {
 1475                 error = linux_recvmsg_common(td, args->s, &msg->msg_hdr,
 1476                     args->flags & ~LINUX_MSG_WAITFORONE, &bsd_msg);
 1477                 if (error != 0)
 1478                         break;
 1479 
 1480                 retval = td->td_retval[0];
 1481                 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len));
 1482                 if (error != 0)
 1483                         break;
 1484                 ++msg;
 1485                 ++datagrams;
 1486 
 1487                 /*
 1488                  * MSG_WAITFORONE turns on MSG_DONTWAIT after one packet.
 1489                  */
 1490                 if (args->flags & LINUX_MSG_WAITFORONE)
 1491                         args->flags |= LINUX_MSG_DONTWAIT;
 1492 
 1493                 /*
 1494                  * See BUGS section of recvmmsg(2).
 1495                  */
 1496                 if (args->timeout) {
 1497                         getnanotime(&ts);
 1498                         timespecsub(&ts, &tts);
 1499                         if (!timespecisset(&ts) || ts.tv_sec > 0)
 1500                                 break;
 1501                 }
 1502                 /* Out of band data, return right away. */
 1503                 if (bsd_msg.msg_flags & MSG_OOB)
 1504                         break;
 1505         }
 1506         if (error == 0)
 1507                 td->td_retval[0] = datagrams;
 1508         return (error);
 1509 }
 1510 
 1511 int
 1512 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1513 {
 1514 
 1515         return (kern_shutdown(td, args->s, args->how));
 1516 }
 1517 
 1518 int
 1519 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1520 {
 1521         struct setsockopt_args /* {
 1522                 int s;
 1523                 int level;
 1524                 int name;
 1525                 caddr_t val;
 1526                 int valsize;
 1527         } */ bsd_args;
 1528         l_timeval linux_tv;
 1529         struct timeval tv;
 1530         int error, name;
 1531 
 1532         bsd_args.s = args->s;
 1533         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1534         switch (bsd_args.level) {
 1535         case SOL_SOCKET:
 1536                 name = linux_to_bsd_so_sockopt(args->optname);
 1537                 switch (name) {
 1538                 case SO_RCVTIMEO:
 1539                         /* FALLTHROUGH */
 1540                 case SO_SNDTIMEO:
 1541                         error = copyin(PTRIN(args->optval), &linux_tv,
 1542                             sizeof(linux_tv));
 1543                         if (error != 0)
 1544                                 return (error);
 1545                         tv.tv_sec = linux_tv.tv_sec;
 1546                         tv.tv_usec = linux_tv.tv_usec;
 1547                         return (kern_setsockopt(td, args->s, bsd_args.level,
 1548                             name, &tv, UIO_SYSSPACE, sizeof(tv)));
 1549                         /* NOTREACHED */
 1550                 default:
 1551                         break;
 1552                 }
 1553                 break;
 1554         case IPPROTO_IP:
 1555                 name = linux_to_bsd_ip_sockopt(args->optname);
 1556                 break;
 1557         case IPPROTO_IPV6:
 1558                 name = linux_to_bsd_ip6_sockopt(args->optname);
 1559                 break;
 1560         case IPPROTO_TCP:
 1561                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1562                 break;
 1563         default:
 1564                 name = -1;
 1565                 break;
 1566         }
 1567         if (name == -1)
 1568                 return (ENOPROTOOPT);
 1569 
 1570         bsd_args.name = name;
 1571         bsd_args.val = PTRIN(args->optval);
 1572         bsd_args.valsize = args->optlen;
 1573 
 1574         if (name == IPV6_NEXTHOP) {
 1575                 linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
 1576                         bsd_args.valsize);
 1577                 error = sys_setsockopt(td, &bsd_args);
 1578                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1579         } else
 1580                 error = sys_setsockopt(td, &bsd_args);
 1581 
 1582         return (error);
 1583 }
 1584 
 1585 int
 1586 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1587 {
 1588         struct getsockopt_args /* {
 1589                 int s;
 1590                 int level;
 1591                 int name;
 1592                 caddr_t val;
 1593                 int *avalsize;
 1594         } */ bsd_args;
 1595         l_timeval linux_tv;
 1596         struct timeval tv;
 1597         socklen_t tv_len, xulen, len;
 1598         struct xucred xu;
 1599         struct l_ucred lxu;
 1600         int error, name, newval;
 1601 
 1602         bsd_args.s = args->s;
 1603         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1604         switch (bsd_args.level) {
 1605         case SOL_SOCKET:
 1606                 name = linux_to_bsd_so_sockopt(args->optname);
 1607                 switch (name) {
 1608                 case SO_RCVTIMEO:
 1609                         /* FALLTHROUGH */
 1610                 case SO_SNDTIMEO:
 1611                         tv_len = sizeof(tv);
 1612                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1613                             name, &tv, UIO_SYSSPACE, &tv_len);
 1614                         if (error != 0)
 1615                                 return (error);
 1616                         linux_tv.tv_sec = tv.tv_sec;
 1617                         linux_tv.tv_usec = tv.tv_usec;
 1618                         return (copyout(&linux_tv, PTRIN(args->optval),
 1619                             sizeof(linux_tv)));
 1620                         /* NOTREACHED */
 1621                 case LOCAL_PEERCRED:
 1622                         if (args->optlen < sizeof(lxu))
 1623                                 return (EINVAL);
 1624                         xulen = sizeof(xu);
 1625                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1626                             name, &xu, UIO_SYSSPACE, &xulen);
 1627                         if (error != 0)
 1628                                 return (error);
 1629                         /*
 1630                          * XXX Use 0 for pid as the FreeBSD does not cache peer pid.
 1631                          */
 1632                         lxu.pid = 0;
 1633                         lxu.uid = xu.cr_uid;
 1634                         lxu.gid = xu.cr_gid;
 1635                         return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
 1636                         /* NOTREACHED */
 1637                 case SO_ERROR:
 1638                         len = sizeof(newval);
 1639                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1640                             name, &newval, UIO_SYSSPACE, &len);
 1641                         if (error != 0)
 1642                                 return (error);
 1643                         newval = -SV_ABI_ERRNO(td->td_proc, newval);
 1644                         return (copyout(&newval, PTRIN(args->optval), len));
 1645                         /* NOTREACHED */
 1646                 default:
 1647                         break;
 1648                 }
 1649                 break;
 1650         case IPPROTO_IP:
 1651                 name = linux_to_bsd_ip_sockopt(args->optname);
 1652                 break;
 1653         case IPPROTO_IPV6:
 1654                 name = linux_to_bsd_ip6_sockopt(args->optname);
 1655                 break;
 1656         case IPPROTO_TCP:
 1657                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1658                 break;
 1659         default:
 1660                 name = -1;
 1661                 break;
 1662         }
 1663         if (name == -1)
 1664                 return (EINVAL);
 1665 
 1666         bsd_args.name = name;
 1667         bsd_args.val = PTRIN(args->optval);
 1668         bsd_args.avalsize = PTRIN(args->optlen);
 1669 
 1670         if (name == IPV6_NEXTHOP) {
 1671                 error = sys_getsockopt(td, &bsd_args);
 1672                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1673         } else
 1674                 error = sys_getsockopt(td, &bsd_args);
 1675 
 1676         return (error);
 1677 }
 1678 
 1679 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1680 
 1681 /* Argument list sizes for linux_socketcall */
 1682 static const unsigned char lxs_args_cnt[] = {
 1683         0 /* unused*/,          3 /* socket */,
 1684         3 /* bind */,           3 /* connect */,
 1685         2 /* listen */,         3 /* accept */,
 1686         3 /* getsockname */,    3 /* getpeername */,
 1687         4 /* socketpair */,     4 /* send */,
 1688         4 /* recv */,           6 /* sendto */,
 1689         6 /* recvfrom */,       2 /* shutdown */,
 1690         5 /* setsockopt */,     5 /* getsockopt */,
 1691         3 /* sendmsg */,        3 /* recvmsg */,
 1692         4 /* accept4 */,        5 /* recvmmsg */,
 1693         4 /* sendmmsg */
 1694 };
 1695 #define LINUX_ARGS_CNT          (nitems(lxs_args_cnt) - 1)
 1696 #define LINUX_ARG_SIZE(x)       (lxs_args_cnt[x] * sizeof(l_ulong))
 1697 
 1698 int
 1699 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1700 {
 1701         l_ulong a[6];
 1702 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 1703         register_t l_args[6];
 1704 #endif
 1705         void *arg;
 1706         int error;
 1707 
 1708         if (args->what < LINUX_SOCKET || args->what > LINUX_ARGS_CNT)
 1709                 return (EINVAL);
 1710         error = copyin(PTRIN(args->args), a, LINUX_ARG_SIZE(args->what));
 1711         if (error != 0)
 1712                 return (error);
 1713 
 1714 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 1715         for (int i = 0; i < lxs_args_cnt[args->what]; ++i)
 1716                 l_args[i] = a[i];
 1717         arg = l_args;
 1718 #else
 1719         arg = a;
 1720 #endif
 1721         switch (args->what) {
 1722         case LINUX_SOCKET:
 1723                 return (linux_socket(td, arg));
 1724         case LINUX_BIND:
 1725                 return (linux_bind(td, arg));
 1726         case LINUX_CONNECT:
 1727                 return (linux_connect(td, arg));
 1728         case LINUX_LISTEN:
 1729                 return (linux_listen(td, arg));
 1730         case LINUX_ACCEPT:
 1731                 return (linux_accept(td, arg));
 1732         case LINUX_GETSOCKNAME:
 1733                 return (linux_getsockname(td, arg));
 1734         case LINUX_GETPEERNAME:
 1735                 return (linux_getpeername(td, arg));
 1736         case LINUX_SOCKETPAIR:
 1737                 return (linux_socketpair(td, arg));
 1738         case LINUX_SEND:
 1739                 return (linux_send(td, arg));
 1740         case LINUX_RECV:
 1741                 return (linux_recv(td, arg));
 1742         case LINUX_SENDTO:
 1743                 return (linux_sendto(td, arg));
 1744         case LINUX_RECVFROM:
 1745                 return (linux_recvfrom(td, arg));
 1746         case LINUX_SHUTDOWN:
 1747                 return (linux_shutdown(td, arg));
 1748         case LINUX_SETSOCKOPT:
 1749                 return (linux_setsockopt(td, arg));
 1750         case LINUX_GETSOCKOPT:
 1751                 return (linux_getsockopt(td, arg));
 1752         case LINUX_SENDMSG:
 1753                 return (linux_sendmsg(td, arg));
 1754         case LINUX_RECVMSG:
 1755                 return (linux_recvmsg(td, arg));
 1756         case LINUX_ACCEPT4:
 1757                 return (linux_accept4(td, arg));
 1758         case LINUX_RECVMMSG:
 1759                 return (linux_recvmmsg(td, arg));
 1760         case LINUX_SENDMMSG:
 1761                 return (linux_sendmmsg(td, arg));
 1762         }
 1763 
 1764         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1765         return (ENOSYS);
 1766 }
 1767 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */

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