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  * Copyright (c) 1995 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/8.3/sys/compat/linux/linux_socket.c 226023 2011-10-04 19:07:38Z cperciva $");
   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/fcntl.h>
   41 #include <sys/file.h>
   42 #include <sys/limits.h>
   43 #include <sys/lock.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mutex.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/socket.h>
   48 #include <sys/socketvar.h>
   49 #include <sys/syscallsubr.h>
   50 #include <sys/uio.h>
   51 #include <sys/syslog.h>
   52 #include <sys/un.h>
   53 
   54 #include <net/if.h>
   55 #include <netinet/in.h>
   56 #include <netinet/in_systm.h>
   57 #include <netinet/ip.h>
   58 #ifdef INET6
   59 #include <netinet/ip6.h>
   60 #include <netinet6/ip6_var.h>
   61 #include <netinet6/in6_var.h>
   62 #endif
   63 
   64 #ifdef COMPAT_LINUX32
   65 #include <machine/../linux32/linux.h>
   66 #include <machine/../linux32/linux32_proto.h>
   67 #else
   68 #include <machine/../linux/linux.h>
   69 #include <machine/../linux/linux_proto.h>
   70 #endif
   71 #include <compat/linux/linux_socket.h>
   72 #include <compat/linux/linux_util.h>
   73 
   74 static int do_sa_get(struct sockaddr **, const struct osockaddr *, int *,
   75     struct malloc_type *);
   76 static int linux_to_bsd_domain(int);
   77 
   78 /*
   79  * Reads a linux sockaddr and does any necessary translation.
   80  * Linux sockaddrs don't have a length field, only a family.
   81  */
   82 static int
   83 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int len)
   84 {
   85         int osalen = len;
   86 
   87         return (do_sa_get(sap, osa, &osalen, M_SONAME));
   88 }
   89 
   90 /*
   91  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   92  * family and convert to sockaddr.
   93  */
   94 static int
   95 do_sa_get(struct sockaddr **sap, const struct osockaddr *osa, int *osalen,
   96     struct malloc_type *mtype)
   97 {
   98         int error=0, bdom;
   99         struct sockaddr *sa;
  100         struct osockaddr *kosa;
  101         int alloclen;
  102 #ifdef INET6
  103         int oldv6size;
  104         struct sockaddr_in6 *sin6;
  105 #endif
  106         int namelen;
  107 
  108         if (*osalen < 2 || *osalen > UCHAR_MAX || !osa)
  109                 return (EINVAL);
  110 
  111         alloclen = *osalen;
  112 #ifdef INET6
  113         oldv6size = 0;
  114         /*
  115          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  116          * if it's a v4-mapped address, so reserve the proper space
  117          * for it.
  118          */
  119         if (alloclen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) {
  120                 alloclen = sizeof (struct sockaddr_in6);
  121                 oldv6size = 1;
  122         }
  123 #endif
  124 
  125         kosa = malloc(alloclen, mtype, M_WAITOK);
  126 
  127         if ((error = copyin(osa, kosa, *osalen)))
  128                 goto out;
  129 
  130         bdom = linux_to_bsd_domain(kosa->sa_family);
  131         if (bdom == -1) {
  132                 error = EAFNOSUPPORT;
  133                 goto out;
  134         }
  135 
  136 #ifdef INET6
  137         /*
  138          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  139          * which lacks the scope id compared with RFC2553 one. If we detect
  140          * the situation, reject the address and write a message to system log.
  141          *
  142          * Still accept addresses for which the scope id is not used.
  143          */
  144         if (oldv6size && bdom == AF_INET6) {
  145                 sin6 = (struct sockaddr_in6 *)kosa;
  146                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  147                     (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  148                      !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  149                      !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  150                      !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  151                      !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  152                         sin6->sin6_scope_id = 0;
  153                 } else {
  154                         log(LOG_DEBUG,
  155                             "obsolete pre-RFC2553 sockaddr_in6 rejected\n");
  156                         error = EINVAL;
  157                         goto out;
  158                 }
  159         } else
  160 #endif
  161         if (bdom == AF_INET) {
  162                 alloclen = sizeof(struct sockaddr_in);
  163                 if (*osalen < alloclen) {
  164                         error = EINVAL;
  165                         goto out;
  166                 }
  167         }
  168 
  169         if ((bdom == AF_LOCAL) && (*osalen > sizeof(struct sockaddr_un))) {
  170                 for (namelen = 0;
  171                     namelen < *osalen - offsetof(struct sockaddr_un, sun_path);
  172                     namelen++)
  173                         if (!((struct sockaddr_un *)kosa)->sun_path[namelen])
  174                                 break;
  175                 if (namelen + offsetof(struct sockaddr_un, sun_path) >
  176                     sizeof(struct sockaddr_un)) {
  177                         error = EINVAL;
  178                         goto out;
  179                 }
  180                 alloclen = sizeof(struct sockaddr_un);
  181         }
  182 
  183         sa = (struct sockaddr *) kosa;
  184         sa->sa_family = bdom;
  185         sa->sa_len = alloclen;
  186 
  187         *sap = sa;
  188         *osalen = alloclen;
  189         return (0);
  190 
  191 out:
  192         free(kosa, mtype);
  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_so_sockopt(int opt)
  293 {
  294 
  295         switch (opt) {
  296         case LINUX_SO_DEBUG:
  297                 return (SO_DEBUG);
  298         case LINUX_SO_REUSEADDR:
  299                 return (SO_REUSEADDR);
  300         case LINUX_SO_TYPE:
  301                 return (SO_TYPE);
  302         case LINUX_SO_ERROR:
  303                 return (SO_ERROR);
  304         case LINUX_SO_DONTROUTE:
  305                 return (SO_DONTROUTE);
  306         case LINUX_SO_BROADCAST:
  307                 return (SO_BROADCAST);
  308         case LINUX_SO_SNDBUF:
  309                 return (SO_SNDBUF);
  310         case LINUX_SO_RCVBUF:
  311                 return (SO_RCVBUF);
  312         case LINUX_SO_KEEPALIVE:
  313                 return (SO_KEEPALIVE);
  314         case LINUX_SO_OOBINLINE:
  315                 return (SO_OOBINLINE);
  316         case LINUX_SO_LINGER:
  317                 return (SO_LINGER);
  318         case LINUX_SO_PEERCRED:
  319                 return (LOCAL_PEERCRED);
  320         case LINUX_SO_RCVLOWAT:
  321                 return (SO_RCVLOWAT);
  322         case LINUX_SO_SNDLOWAT:
  323                 return (SO_SNDLOWAT);
  324         case LINUX_SO_RCVTIMEO:
  325                 return (SO_RCVTIMEO);
  326         case LINUX_SO_SNDTIMEO:
  327                 return (SO_SNDTIMEO);
  328         case LINUX_SO_TIMESTAMP:
  329                 return (SO_TIMESTAMP);
  330         case LINUX_SO_ACCEPTCONN:
  331                 return (SO_ACCEPTCONN);
  332         }
  333         return (-1);
  334 }
  335 
  336 static int
  337 linux_to_bsd_msg_flags(int flags)
  338 {
  339         int ret_flags = 0;
  340 
  341         if (flags & LINUX_MSG_OOB)
  342                 ret_flags |= MSG_OOB;
  343         if (flags & LINUX_MSG_PEEK)
  344                 ret_flags |= MSG_PEEK;
  345         if (flags & LINUX_MSG_DONTROUTE)
  346                 ret_flags |= MSG_DONTROUTE;
  347         if (flags & LINUX_MSG_CTRUNC)
  348                 ret_flags |= MSG_CTRUNC;
  349         if (flags & LINUX_MSG_TRUNC)
  350                 ret_flags |= MSG_TRUNC;
  351         if (flags & LINUX_MSG_DONTWAIT)
  352                 ret_flags |= MSG_DONTWAIT;
  353         if (flags & LINUX_MSG_EOR)
  354                 ret_flags |= MSG_EOR;
  355         if (flags & LINUX_MSG_WAITALL)
  356                 ret_flags |= MSG_WAITALL;
  357         if (flags & LINUX_MSG_NOSIGNAL)
  358                 ret_flags |= MSG_NOSIGNAL;
  359 #if 0 /* not handled */
  360         if (flags & LINUX_MSG_PROXY)
  361                 ;
  362         if (flags & LINUX_MSG_FIN)
  363                 ;
  364         if (flags & LINUX_MSG_SYN)
  365                 ;
  366         if (flags & LINUX_MSG_CONFIRM)
  367                 ;
  368         if (flags & LINUX_MSG_RST)
  369                 ;
  370         if (flags & LINUX_MSG_ERRQUEUE)
  371                 ;
  372 #endif
  373         return ret_flags;
  374 }
  375 
  376 /*
  377 * If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
  378 * native syscall will fault.  Thus, we don't really need to check the
  379 * return values for these functions.
  380 */
  381 
  382 static int
  383 bsd_to_linux_sockaddr(struct sockaddr *arg)
  384 {
  385         struct sockaddr sa;
  386         size_t sa_len = sizeof(struct sockaddr);
  387         int error;
  388         
  389         if ((error = copyin(arg, &sa, sa_len)))
  390                 return (error);
  391         
  392         *(u_short *)&sa = sa.sa_family;
  393         
  394         error = copyout(&sa, arg, sa_len);
  395         
  396         return (error);
  397 }
  398 
  399 static int
  400 linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
  401 {
  402         struct sockaddr sa;
  403         size_t sa_len = sizeof(struct sockaddr);
  404         int error;
  405 
  406         if ((error = copyin(arg, &sa, sa_len)))
  407                 return (error);
  408 
  409         sa.sa_family = *(sa_family_t *)&sa;
  410         sa.sa_len = len;
  411 
  412         error = copyout(&sa, arg, sa_len);
  413 
  414         return (error);
  415 }
  416 
  417 
  418 static int
  419 linux_sa_put(struct osockaddr *osa)
  420 {
  421         struct osockaddr sa;
  422         int error, bdom;
  423 
  424         /*
  425          * Only read/write the osockaddr family part, the rest is
  426          * not changed.
  427          */
  428         error = copyin(osa, &sa, sizeof(sa.sa_family));
  429         if (error)
  430                 return (error);
  431 
  432         bdom = bsd_to_linux_domain(sa.sa_family);
  433         if (bdom == -1)
  434                 return (EINVAL);
  435 
  436         sa.sa_family = bdom;
  437         error = copyout(&sa, osa, sizeof(sa.sa_family));
  438         if (error)
  439                 return (error);
  440 
  441         return (0);
  442 }
  443 
  444 static int
  445 linux_to_bsd_cmsg_type(int cmsg_type)
  446 {
  447 
  448         switch (cmsg_type) {
  449         case LINUX_SCM_RIGHTS:
  450                 return (SCM_RIGHTS);
  451         case LINUX_SCM_CREDENTIALS:
  452                 return (SCM_CREDS);
  453         }
  454         return (-1);
  455 }
  456 
  457 static int
  458 bsd_to_linux_cmsg_type(int cmsg_type)
  459 {
  460 
  461         switch (cmsg_type) {
  462         case SCM_RIGHTS:
  463                 return (LINUX_SCM_RIGHTS);
  464         case SCM_CREDS:
  465                 return (LINUX_SCM_CREDENTIALS);
  466         }
  467         return (-1);
  468 }
  469 
  470 static int
  471 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
  472 {
  473         if (lhdr->msg_controllen > INT_MAX)
  474                 return (ENOBUFS);
  475 
  476         bhdr->msg_name          = PTRIN(lhdr->msg_name);
  477         bhdr->msg_namelen       = lhdr->msg_namelen;
  478         bhdr->msg_iov           = PTRIN(lhdr->msg_iov);
  479         bhdr->msg_iovlen        = lhdr->msg_iovlen;
  480         bhdr->msg_control       = PTRIN(lhdr->msg_control);
  481 
  482         /*
  483          * msg_controllen is skipped since BSD and LINUX control messages
  484          * are potentially different sizes (e.g. the cred structure used
  485          * by SCM_CREDS is different between the two operating system).
  486          *
  487          * The caller can set it (if necessary) after converting all the
  488          * control messages.
  489          */
  490 
  491         bhdr->msg_flags         = linux_to_bsd_msg_flags(lhdr->msg_flags);
  492         return (0);
  493 }
  494 
  495 static int
  496 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
  497 {
  498         lhdr->msg_name          = PTROUT(bhdr->msg_name);
  499         lhdr->msg_namelen       = bhdr->msg_namelen;
  500         lhdr->msg_iov           = PTROUT(bhdr->msg_iov);
  501         lhdr->msg_iovlen        = bhdr->msg_iovlen;
  502         lhdr->msg_control       = PTROUT(bhdr->msg_control);
  503 
  504         /*
  505          * msg_controllen is skipped since BSD and LINUX control messages
  506          * are potentially different sizes (e.g. the cred structure used
  507          * by SCM_CREDS is different between the two operating system).
  508          *
  509          * The caller can set it (if necessary) after converting all the
  510          * control messages.
  511          */
  512 
  513         /* msg_flags skipped */
  514         return (0);
  515 }
  516 
  517 static int
  518 linux_set_socket_flags(struct thread *td, int s, int flags)
  519 {
  520         int error;
  521 
  522         if (flags & LINUX_SOCK_NONBLOCK) {
  523                 error = kern_fcntl(td, s, F_SETFL, O_NONBLOCK);
  524                 if (error)
  525                         return (error);
  526         }
  527         if (flags & LINUX_SOCK_CLOEXEC) {
  528                 error = kern_fcntl(td, s, F_SETFD, FD_CLOEXEC);
  529                 if (error)
  530                         return (error);
  531         }
  532         return (0);
  533 }
  534 
  535 static int
  536 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  537     struct mbuf *control, enum uio_seg segflg)
  538 {
  539         struct sockaddr *to;
  540         int error;
  541 
  542         if (mp->msg_name != NULL) {
  543                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  544                 if (error)
  545                         return (error);
  546                 mp->msg_name = to;
  547         } else
  548                 to = NULL;
  549 
  550         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  551             segflg);
  552 
  553         if (to)
  554                 free(to, M_SONAME);
  555         return (error);
  556 }
  557 
  558 /* Return 0 if IP_HDRINCL is set for the given socket. */
  559 static int
  560 linux_check_hdrincl(struct thread *td, int s)
  561 {
  562         int error, optval, size_val;
  563 
  564         size_val = sizeof(optval);
  565         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  566             &optval, UIO_SYSSPACE, &size_val);
  567         if (error)
  568                 return (error);
  569 
  570         return (optval == 0);
  571 }
  572 
  573 struct linux_sendto_args {
  574         int s;
  575         l_uintptr_t msg;
  576         int len;
  577         int flags;
  578         l_uintptr_t to;
  579         int tolen;
  580 };
  581 
  582 /*
  583  * Updated sendto() when IP_HDRINCL is set:
  584  * tweak endian-dependent fields in the IP packet.
  585  */
  586 static int
  587 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  588 {
  589 /*
  590  * linux_ip_copysize defines how many bytes we should copy
  591  * from the beginning of the IP packet before we customize it for BSD.
  592  * It should include all the fields we modify (ip_len and ip_off).
  593  */
  594 #define linux_ip_copysize       8
  595 
  596         struct ip *packet;
  597         struct msghdr msg;
  598         struct iovec aiov[1];
  599         int error;
  600 
  601         /* Check that the packet isn't too big or too small. */
  602         if (linux_args->len < linux_ip_copysize ||
  603             linux_args->len > IP_MAXPACKET)
  604                 return (EINVAL);
  605 
  606         packet = (struct ip *)malloc(linux_args->len, M_TEMP, M_WAITOK);
  607 
  608         /* Make kernel copy of the packet to be sent */
  609         if ((error = copyin(PTRIN(linux_args->msg), packet,
  610             linux_args->len)))
  611                 goto goout;
  612 
  613         /* Convert fields from Linux to BSD raw IP socket format */
  614         packet->ip_len = linux_args->len;
  615         packet->ip_off = ntohs(packet->ip_off);
  616 
  617         /* Prepare the msghdr and iovec structures describing the new packet */
  618         msg.msg_name = PTRIN(linux_args->to);
  619         msg.msg_namelen = linux_args->tolen;
  620         msg.msg_iov = aiov;
  621         msg.msg_iovlen = 1;
  622         msg.msg_control = NULL;
  623         msg.msg_flags = 0;
  624         aiov[0].iov_base = (char *)packet;
  625         aiov[0].iov_len = linux_args->len;
  626         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  627             NULL, UIO_SYSSPACE);
  628 goout:
  629         free(packet, M_TEMP);
  630         return (error);
  631 }
  632 
  633 struct linux_socket_args {
  634         int domain;
  635         int type;
  636         int protocol;
  637 };
  638 
  639 static int
  640 linux_socket(struct thread *td, struct linux_socket_args *args)
  641 {
  642         struct socket_args /* {
  643                 int domain;
  644                 int type;
  645                 int protocol;
  646         } */ bsd_args;
  647         int retval_socket, socket_flags;
  648 
  649         bsd_args.protocol = args->protocol;
  650         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  651         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  652                 return (EINVAL);
  653         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  654         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  655                 return (EINVAL);
  656         bsd_args.domain = linux_to_bsd_domain(args->domain);
  657         if (bsd_args.domain == -1)
  658                 return (EAFNOSUPPORT);
  659 
  660         retval_socket = socket(td, &bsd_args);
  661         if (retval_socket)
  662                 return (retval_socket);
  663 
  664         retval_socket = linux_set_socket_flags(td, td->td_retval[0],
  665             socket_flags);
  666         if (retval_socket) {
  667                 (void)kern_close(td, td->td_retval[0]);
  668                 goto out;
  669         }
  670 
  671         if (bsd_args.type == SOCK_RAW
  672             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  673             && bsd_args.domain == PF_INET) {
  674                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  675                 int hdrincl;
  676 
  677                 hdrincl = 1;
  678                 /* We ignore any error returned by kern_setsockopt() */
  679                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  680                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  681         }
  682 #ifdef INET6
  683         /*
  684          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
  685          * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
  686          * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
  687          * sysctl value.
  688          */
  689         if (bsd_args.domain == PF_INET6) {
  690                 int v6only;
  691 
  692                 v6only = 0;
  693                 /* We ignore any error returned by setsockopt() */
  694                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  695                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  696         }
  697 #endif
  698 
  699 out:
  700         return (retval_socket);
  701 }
  702 
  703 struct linux_bind_args {
  704         int s;
  705         l_uintptr_t name;
  706         int namelen;
  707 };
  708 
  709 static int
  710 linux_bind(struct thread *td, struct linux_bind_args *args)
  711 {
  712         struct sockaddr *sa;
  713         int error;
  714 
  715         error = linux_getsockaddr(&sa, PTRIN(args->name),
  716             args->namelen);
  717         if (error)
  718                 return (error);
  719 
  720         error = kern_bind(td, args->s, sa);
  721         free(sa, M_SONAME);
  722         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  723                 return (EINVAL);
  724         return (error);
  725 }
  726 
  727 struct linux_connect_args {
  728         int s;
  729         l_uintptr_t name;
  730         int namelen;
  731 };
  732 int linux_connect(struct thread *, struct linux_connect_args *);
  733 
  734 int
  735 linux_connect(struct thread *td, struct linux_connect_args *args)
  736 {
  737         struct socket *so;
  738         struct sockaddr *sa;
  739         u_int fflag;
  740         int error;
  741 
  742         error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
  743             args->namelen);
  744         if (error)
  745                 return (error);
  746 
  747         error = kern_connect(td, args->s, sa);
  748         free(sa, M_SONAME);
  749         if (error != EISCONN)
  750                 return (error);
  751 
  752         /*
  753          * Linux doesn't return EISCONN the first time it occurs,
  754          * when on a non-blocking socket. Instead it returns the
  755          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  756          *
  757          * XXXRW: Instead of using fgetsock(), check that it is a
  758          * socket and use the file descriptor reference instead of
  759          * creating a new one.
  760          */
  761         error = fgetsock(td, args->s, &so, &fflag);
  762         if (error == 0) {
  763                 error = EISCONN;
  764                 if (fflag & FNONBLOCK) {
  765                         SOCK_LOCK(so);
  766                         if (so->so_emuldata == 0)
  767                                 error = so->so_error;
  768                         so->so_emuldata = (void *)1;
  769                         SOCK_UNLOCK(so);
  770                 }
  771                 fputsock(so);
  772         }
  773         return (error);
  774 }
  775 
  776 struct linux_listen_args {
  777         int s;
  778         int backlog;
  779 };
  780 
  781 static int
  782 linux_listen(struct thread *td, struct linux_listen_args *args)
  783 {
  784         struct listen_args /* {
  785                 int s;
  786                 int backlog;
  787         } */ bsd_args;
  788 
  789         bsd_args.s = args->s;
  790         bsd_args.backlog = args->backlog;
  791         return (listen(td, &bsd_args));
  792 }
  793 
  794 static int
  795 linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
  796     l_uintptr_t namelen, int flags)
  797 {
  798         struct accept_args /* {
  799                 int     s;
  800                 struct sockaddr * __restrict name;
  801                 socklen_t * __restrict anamelen;
  802         } */ bsd_args;
  803         int error;
  804 
  805         if (flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  806                 return (EINVAL);
  807 
  808         bsd_args.s = s;
  809         /* XXX: */
  810         bsd_args.name = (struct sockaddr * __restrict)PTRIN(addr);
  811         bsd_args.anamelen = PTRIN(namelen);/* XXX */
  812         error = accept(td, &bsd_args);
  813         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
  814         if (error) {
  815                 if (error == EFAULT && namelen != sizeof(struct sockaddr_in))
  816                         return (EINVAL);
  817                 return (error);
  818         }
  819 
  820         /*
  821          * linux appears not to copy flags from the parent socket to the
  822          * accepted one, so we must clear the flags in the new descriptor
  823          * and apply the requested flags.
  824          */
  825         error = kern_fcntl(td, td->td_retval[0], F_SETFL, 0);
  826         if (error)
  827                 goto out;
  828         error = linux_set_socket_flags(td, td->td_retval[0], flags);
  829         if (error)
  830                 goto out;
  831         if (addr)
  832                 error = linux_sa_put(PTRIN(addr));
  833 
  834 out:
  835         if (error) {
  836                 (void)kern_close(td, td->td_retval[0]);
  837                 td->td_retval[0] = 0;
  838         }
  839         return (error);
  840 }
  841 
  842 struct linux_accept_args {
  843         int s;
  844         l_uintptr_t addr;
  845         l_uintptr_t namelen;
  846 };
  847 
  848 static int
  849 linux_accept(struct thread *td, struct linux_accept_args *args)
  850 {
  851 
  852         return (linux_accept_common(td, args->s, args->addr,
  853             args->namelen, 0));
  854 }
  855 
  856 struct linux_accept4_args {
  857         int s;
  858         l_uintptr_t addr;
  859         l_uintptr_t namelen;
  860         int flags;
  861 };
  862 
  863 static int
  864 linux_accept4(struct thread *td, struct linux_accept4_args *args)
  865 {
  866 
  867         return (linux_accept_common(td, args->s, args->addr,
  868             args->namelen, args->flags));
  869 }
  870 
  871 struct linux_getsockname_args {
  872         int s;
  873         l_uintptr_t addr;
  874         l_uintptr_t namelen;
  875 };
  876 
  877 static int
  878 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  879 {
  880         struct getsockname_args /* {
  881                 int     fdes;
  882                 struct sockaddr * __restrict asa;
  883                 socklen_t * __restrict alen;
  884         } */ bsd_args;
  885         int error;
  886 
  887         bsd_args.fdes = args->s;
  888         /* XXX: */
  889         bsd_args.asa = (struct sockaddr * __restrict)PTRIN(args->addr);
  890         bsd_args.alen = PTRIN(args->namelen);   /* XXX */
  891         error = getsockname(td, &bsd_args);
  892         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  893         if (error)
  894                 return (error);
  895         error = linux_sa_put(PTRIN(args->addr));
  896         if (error)
  897                 return (error);
  898         return (0);
  899 }
  900 
  901 struct linux_getpeername_args {
  902         int s;
  903         l_uintptr_t addr;
  904         l_uintptr_t namelen;
  905 };
  906 
  907 static int
  908 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  909 {
  910         struct getpeername_args /* {
  911                 int fdes;
  912                 caddr_t asa;
  913                 int *alen;
  914         } */ bsd_args;
  915         int error;
  916 
  917         bsd_args.fdes = args->s;
  918         bsd_args.asa = (struct sockaddr *)PTRIN(args->addr);
  919         bsd_args.alen = (int *)PTRIN(args->namelen);
  920         error = getpeername(td, &bsd_args);
  921         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  922         if (error)
  923                 return (error);
  924         error = linux_sa_put(PTRIN(args->addr));
  925         if (error)
  926                 return (error);
  927         return (0);
  928 }
  929 
  930 struct linux_socketpair_args {
  931         int domain;
  932         int type;
  933         int protocol;
  934         l_uintptr_t rsv;
  935 };
  936 
  937 static int
  938 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  939 {
  940         struct socketpair_args /* {
  941                 int domain;
  942                 int type;
  943                 int protocol;
  944                 int *rsv;
  945         } */ bsd_args;
  946         int error, socket_flags;
  947         int sv[2];
  948 
  949         bsd_args.domain = linux_to_bsd_domain(args->domain);
  950         if (bsd_args.domain != PF_LOCAL)
  951                 return (EAFNOSUPPORT);
  952 
  953         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  954         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  955                 return (EINVAL);
  956         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  957         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  958                 return (EINVAL);
  959 
  960         if (args->protocol != 0 && args->protocol != PF_UNIX)
  961 
  962                 /*
  963                  * Use of PF_UNIX as protocol argument is not right,
  964                  * but Linux does it.
  965                  * Do not map PF_UNIX as its Linux value is identical
  966                  * to FreeBSD one.
  967                  */
  968                 return (EPROTONOSUPPORT);
  969         else
  970                 bsd_args.protocol = 0;
  971         bsd_args.rsv = (int *)PTRIN(args->rsv);
  972         error = kern_socketpair(td, bsd_args.domain, bsd_args.type,
  973             bsd_args.protocol, sv);
  974         if (error)
  975                 return (error);
  976         error = linux_set_socket_flags(td, sv[0], socket_flags);
  977         if (error)
  978                 goto out;
  979         error = linux_set_socket_flags(td, sv[1], socket_flags);
  980         if (error)
  981                 goto out;
  982 
  983         error = copyout(sv, bsd_args.rsv, 2 * sizeof(int));
  984 
  985 out:
  986         if (error) {
  987                 (void)kern_close(td, sv[0]);
  988                 (void)kern_close(td, sv[1]);
  989         }
  990         return (error);
  991 }
  992 
  993 struct linux_send_args {
  994         int s;
  995         l_uintptr_t msg;
  996         int len;
  997         int flags;
  998 };
  999 
 1000 static int
 1001 linux_send(struct thread *td, struct linux_send_args *args)
 1002 {
 1003         struct sendto_args /* {
 1004                 int s;
 1005                 caddr_t buf;
 1006                 int len;
 1007                 int flags;
 1008                 caddr_t to;
 1009                 int tolen;
 1010         } */ bsd_args;
 1011 
 1012         bsd_args.s = args->s;
 1013         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1014         bsd_args.len = args->len;
 1015         bsd_args.flags = args->flags;
 1016         bsd_args.to = NULL;
 1017         bsd_args.tolen = 0;
 1018         return sendto(td, &bsd_args);
 1019 }
 1020 
 1021 struct linux_recv_args {
 1022         int s;
 1023         l_uintptr_t msg;
 1024         int len;
 1025         int flags;
 1026 };
 1027 
 1028 static int
 1029 linux_recv(struct thread *td, struct linux_recv_args *args)
 1030 {
 1031         struct recvfrom_args /* {
 1032                 int s;
 1033                 caddr_t buf;
 1034                 int len;
 1035                 int flags;
 1036                 struct sockaddr *from;
 1037                 socklen_t fromlenaddr;
 1038         } */ bsd_args;
 1039 
 1040         bsd_args.s = args->s;
 1041         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1042         bsd_args.len = args->len;
 1043         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1044         bsd_args.from = NULL;
 1045         bsd_args.fromlenaddr = 0;
 1046         return (recvfrom(td, &bsd_args));
 1047 }
 1048 
 1049 static int
 1050 linux_sendto(struct thread *td, struct linux_sendto_args *args)
 1051 {
 1052         struct msghdr msg;
 1053         struct iovec aiov;
 1054         int error;
 1055 
 1056         if (linux_check_hdrincl(td, args->s) == 0)
 1057                 /* IP_HDRINCL set, tweak the packet before sending */
 1058                 return (linux_sendto_hdrincl(td, args));
 1059 
 1060         msg.msg_name = PTRIN(args->to);
 1061         msg.msg_namelen = args->tolen;
 1062         msg.msg_iov = &aiov;
 1063         msg.msg_iovlen = 1;
 1064         msg.msg_control = NULL;
 1065         msg.msg_flags = 0;
 1066         aiov.iov_base = PTRIN(args->msg);
 1067         aiov.iov_len = args->len;
 1068         error = linux_sendit(td, args->s, &msg, args->flags, NULL,
 1069             UIO_USERSPACE);
 1070         return (error);
 1071 }
 1072 
 1073 struct linux_recvfrom_args {
 1074         int s;
 1075         l_uintptr_t buf;
 1076         int len;
 1077         int flags;
 1078         l_uintptr_t from;
 1079         l_uintptr_t fromlen;
 1080 };
 1081 
 1082 static int
 1083 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
 1084 {
 1085         struct recvfrom_args /* {
 1086                 int     s;
 1087                 caddr_t buf;
 1088                 size_t  len;
 1089                 int     flags;
 1090                 struct sockaddr * __restrict from;
 1091                 socklen_t * __restrict fromlenaddr;
 1092         } */ bsd_args;
 1093         size_t len;
 1094         int error;
 1095 
 1096         if ((error = copyin(PTRIN(args->fromlen), &len, sizeof(size_t))))
 1097                 return (error);
 1098 
 1099         bsd_args.s = args->s;
 1100         bsd_args.buf = PTRIN(args->buf);
 1101         bsd_args.len = args->len;
 1102         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1103         /* XXX: */
 1104         bsd_args.from = (struct sockaddr * __restrict)PTRIN(args->from);
 1105         bsd_args.fromlenaddr = PTRIN(args->fromlen);/* XXX */
 1106         
 1107         linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.from, len);
 1108         error = recvfrom(td, &bsd_args);
 1109         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.from);
 1110         
 1111         if (error)
 1112                 return (error);
 1113         if (args->from) {
 1114                 error = linux_sa_put((struct osockaddr *)
 1115                     PTRIN(args->from));
 1116                 if (error)
 1117                         return (error);
 1118         }
 1119         return (0);
 1120 }
 1121 
 1122 struct linux_sendmsg_args {
 1123         int s;
 1124         l_uintptr_t msg;
 1125         int flags;
 1126 };
 1127 
 1128 static int
 1129 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
 1130 {
 1131         struct cmsghdr *cmsg;
 1132         struct cmsgcred cmcred;
 1133         struct mbuf *control;
 1134         struct msghdr msg;
 1135         struct l_cmsghdr linux_cmsg;
 1136         struct l_cmsghdr *ptr_cmsg;
 1137         struct l_msghdr linux_msg;
 1138         struct iovec *iov;
 1139         socklen_t datalen;
 1140         struct sockaddr *sa;
 1141         sa_family_t sa_family;
 1142         void *data;
 1143         int error;
 1144 
 1145         error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
 1146         if (error)
 1147                 return (error);
 1148 
 1149         /*
 1150          * Some Linux applications (ping) define a non-NULL control data
 1151          * pointer, but a msg_controllen of 0, which is not allowed in the
 1152          * FreeBSD system call interface.  NULL the msg_control pointer in
 1153          * order to handle this case.  This should be checked, but allows the
 1154          * Linux ping to work.
 1155          */
 1156         if (PTRIN(linux_msg.msg_control) != NULL && linux_msg.msg_controllen == 0)
 1157                 linux_msg.msg_control = PTROUT(NULL);
 1158 
 1159         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1160         if (error)
 1161                 return (error);
 1162 
 1163 #ifdef COMPAT_LINUX32
 1164         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1165             &iov, EMSGSIZE);
 1166 #else
 1167         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1168 #endif
 1169         if (error)
 1170                 return (error);
 1171 
 1172         control = NULL;
 1173         cmsg = NULL;
 1174 
 1175         if ((ptr_cmsg = LINUX_CMSG_FIRSTHDR(&linux_msg)) != NULL) {
 1176                 error = kern_getsockname(td, args->s, &sa, &datalen);
 1177                 if (error)
 1178                         goto bad;
 1179                 sa_family = sa->sa_family;
 1180                 free(sa, M_SONAME);
 1181 
 1182                 error = ENOBUFS;
 1183                 cmsg = malloc(CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
 1184                 control = m_get(M_WAIT, MT_CONTROL);
 1185                 if (control == NULL)
 1186                         goto bad;
 1187 
 1188                 do {
 1189                         error = copyin(ptr_cmsg, &linux_cmsg,
 1190                             sizeof(struct l_cmsghdr));
 1191                         if (error)
 1192                                 goto bad;
 1193 
 1194                         error = EINVAL;
 1195                         if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr))
 1196                                 goto bad;
 1197 
 1198                         /*
 1199                          * Now we support only SCM_RIGHTS and SCM_CRED,
 1200                          * so return EINVAL in any other cmsg_type
 1201                          */
 1202                         cmsg->cmsg_type =
 1203                             linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
 1204                         cmsg->cmsg_level =
 1205                             linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
 1206                         if (cmsg->cmsg_type == -1
 1207                             || cmsg->cmsg_level != SOL_SOCKET)
 1208                                 goto bad;
 1209 
 1210                         /*
 1211                          * Some applications (e.g. pulseaudio) attempt to
 1212                          * send ancillary data even if the underlying protocol
 1213                          * doesn't support it which is not allowed in the
 1214                          * FreeBSD system call interface.
 1215                          */
 1216                         if (sa_family != AF_UNIX)
 1217                                 continue;
 1218 
 1219                         data = LINUX_CMSG_DATA(ptr_cmsg);
 1220                         datalen = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
 1221 
 1222                         switch (cmsg->cmsg_type)
 1223                         {
 1224                         case SCM_RIGHTS:
 1225                                 break;
 1226 
 1227                         case SCM_CREDS:
 1228                                 data = &cmcred;
 1229                                 datalen = sizeof(cmcred);
 1230 
 1231                                 /*
 1232                                  * The lower levels will fill in the structure
 1233                                  */
 1234                                 bzero(data, datalen);
 1235                                 break;
 1236                         }
 1237 
 1238                         cmsg->cmsg_len = CMSG_LEN(datalen);
 1239 
 1240                         error = ENOBUFS;
 1241                         if (!m_append(control, CMSG_HDRSZ, (c_caddr_t) cmsg))
 1242                                 goto bad;
 1243                         if (!m_append(control, datalen, (c_caddr_t) data))
 1244                                 goto bad;
 1245                 } while ((ptr_cmsg = LINUX_CMSG_NXTHDR(&linux_msg, ptr_cmsg)));
 1246 
 1247                 if (m_length(control, NULL) == 0) {
 1248                         m_freem(control);
 1249                         control = NULL;
 1250                 }
 1251         }
 1252 
 1253         msg.msg_iov = iov;
 1254         msg.msg_flags = 0;
 1255         error = linux_sendit(td, args->s, &msg, args->flags, control,
 1256             UIO_USERSPACE);
 1257 
 1258 bad:
 1259         free(iov, M_IOV);
 1260         if (cmsg)
 1261                 free(cmsg, M_TEMP);
 1262         return (error);
 1263 }
 1264 
 1265 struct linux_recvmsg_args {
 1266         int s;
 1267         l_uintptr_t msg;
 1268         int flags;
 1269 };
 1270 
 1271 static int
 1272 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
 1273 {
 1274         struct cmsghdr *cm;
 1275         struct cmsgcred *cmcred;
 1276         struct msghdr msg;
 1277         struct l_cmsghdr *linux_cmsg = NULL;
 1278         struct l_ucred linux_ucred;
 1279         socklen_t datalen, outlen;
 1280         struct l_msghdr linux_msg;
 1281         struct iovec *iov, *uiov;
 1282         struct mbuf *control = NULL;
 1283         struct mbuf **controlp;
 1284         caddr_t outbuf;
 1285         void *data;
 1286         int error, i, fd, fds, *fdp;
 1287 
 1288         error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
 1289         if (error)
 1290                 return (error);
 1291 
 1292         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1293         if (error)
 1294                 return (error);
 1295 
 1296 #ifdef COMPAT_LINUX32
 1297         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1298             &iov, EMSGSIZE);
 1299 #else
 1300         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1301 #endif
 1302         if (error)
 1303                 return (error);
 1304 
 1305         if (msg.msg_name) {
 1306                 error = linux_to_bsd_sockaddr((struct sockaddr *)msg.msg_name,
 1307                     msg.msg_namelen);
 1308                 if (error)
 1309                         goto bad;
 1310         }
 1311 
 1312         uiov = msg.msg_iov;
 1313         msg.msg_iov = iov;
 1314         controlp = (msg.msg_control != NULL) ? &control : NULL;
 1315         error = kern_recvit(td, args->s, &msg, UIO_USERSPACE, controlp);
 1316         msg.msg_iov = uiov;
 1317         if (error)
 1318                 goto bad;
 1319 
 1320         error = bsd_to_linux_msghdr(&msg, &linux_msg);
 1321         if (error)
 1322                 goto bad;
 1323 
 1324         if (linux_msg.msg_name) {
 1325                 error = bsd_to_linux_sockaddr((struct sockaddr *)
 1326                     PTRIN(linux_msg.msg_name));
 1327                 if (error)
 1328                         goto bad;
 1329         }
 1330         if (linux_msg.msg_name && linux_msg.msg_namelen > 2) {
 1331                 error = linux_sa_put(PTRIN(linux_msg.msg_name));
 1332                 if (error)
 1333                         goto bad;
 1334         }
 1335 
 1336         outbuf = PTRIN(linux_msg.msg_control);
 1337         outlen = 0;
 1338 
 1339         if (control) {
 1340                 linux_cmsg = malloc(L_CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
 1341 
 1342                 msg.msg_control = mtod(control, struct cmsghdr *);
 1343                 msg.msg_controllen = control->m_len;
 1344 
 1345                 cm = CMSG_FIRSTHDR(&msg);
 1346 
 1347                 while (cm != NULL) {
 1348                         linux_cmsg->cmsg_type =
 1349                             bsd_to_linux_cmsg_type(cm->cmsg_type);
 1350                         linux_cmsg->cmsg_level =
 1351                             bsd_to_linux_sockopt_level(cm->cmsg_level);
 1352                         if (linux_cmsg->cmsg_type == -1
 1353                             || cm->cmsg_level != SOL_SOCKET)
 1354                         {
 1355                                 error = EINVAL;
 1356                                 goto bad;
 1357                         }
 1358 
 1359                         data = CMSG_DATA(cm);
 1360                         datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1361 
 1362                         switch (cm->cmsg_type)
 1363                         {
 1364                         case SCM_RIGHTS:
 1365                                 if (args->flags & LINUX_MSG_CMSG_CLOEXEC) {
 1366                                         fds = datalen / sizeof(int);
 1367                                         fdp = data;
 1368                                         for (i = 0; i < fds; i++) {
 1369                                                 fd = *fdp++;
 1370                                                 (void)kern_fcntl(td, fd,
 1371                                                     F_SETFD, FD_CLOEXEC);
 1372                                         }
 1373                                 }
 1374                                 break;
 1375 
 1376                         case SCM_CREDS:
 1377                                 /*
 1378                                  * Currently LOCAL_CREDS is never in
 1379                                  * effect for Linux so no need to worry
 1380                                  * about sockcred
 1381                                  */
 1382                                 if (datalen != sizeof (*cmcred)) {
 1383                                         error = EMSGSIZE;
 1384                                         goto bad;
 1385                                 }
 1386                                 cmcred = (struct cmsgcred *)data;
 1387                                 bzero(&linux_ucred, sizeof(linux_ucred));
 1388                                 linux_ucred.pid = cmcred->cmcred_pid;
 1389                                 linux_ucred.uid = cmcred->cmcred_uid;
 1390                                 linux_ucred.gid = cmcred->cmcred_gid;
 1391                                 data = &linux_ucred;
 1392                                 datalen = sizeof(linux_ucred);
 1393                                 break;
 1394                         }
 1395 
 1396                         if (outlen + LINUX_CMSG_LEN(datalen) >
 1397                             linux_msg.msg_controllen) {
 1398                                 if (outlen == 0) {
 1399                                         error = EMSGSIZE;
 1400                                         goto bad;
 1401                                 } else {
 1402                                         linux_msg.msg_flags |=
 1403                                             LINUX_MSG_CTRUNC;
 1404                                         goto out;
 1405                                 }
 1406                         }
 1407 
 1408                         linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
 1409 
 1410                         error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
 1411                         if (error)
 1412                                 goto bad;
 1413                         outbuf += L_CMSG_HDRSZ;
 1414 
 1415                         error = copyout(data, outbuf, datalen);
 1416                         if (error)
 1417                                 goto bad;
 1418 
 1419                         outbuf += LINUX_CMSG_ALIGN(datalen);
 1420                         outlen += LINUX_CMSG_LEN(datalen);
 1421 
 1422                         cm = CMSG_NXTHDR(&msg, cm);
 1423                 }
 1424         }
 1425 
 1426 out:
 1427         linux_msg.msg_controllen = outlen;
 1428         error = copyout(&linux_msg, PTRIN(args->msg), sizeof(linux_msg));
 1429 
 1430 bad:
 1431         free(iov, M_IOV);
 1432         if (control != NULL)
 1433                 m_freem(control);
 1434         if (linux_cmsg != NULL)
 1435                 free(linux_cmsg, M_TEMP);
 1436 
 1437         return (error);
 1438 }
 1439 
 1440 struct linux_shutdown_args {
 1441         int s;
 1442         int how;
 1443 };
 1444 
 1445 static int
 1446 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1447 {
 1448         struct shutdown_args /* {
 1449                 int s;
 1450                 int how;
 1451         } */ bsd_args;
 1452 
 1453         bsd_args.s = args->s;
 1454         bsd_args.how = args->how;
 1455         return (shutdown(td, &bsd_args));
 1456 }
 1457 
 1458 struct linux_setsockopt_args {
 1459         int s;
 1460         int level;
 1461         int optname;
 1462         l_uintptr_t optval;
 1463         int optlen;
 1464 };
 1465 
 1466 static int
 1467 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1468 {
 1469         struct setsockopt_args /* {
 1470                 int s;
 1471                 int level;
 1472                 int name;
 1473                 caddr_t val;
 1474                 int valsize;
 1475         } */ bsd_args;
 1476         l_timeval linux_tv;
 1477         struct timeval tv;
 1478         int error, name;
 1479 
 1480         bsd_args.s = args->s;
 1481         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1482         switch (bsd_args.level) {
 1483         case SOL_SOCKET:
 1484                 name = linux_to_bsd_so_sockopt(args->optname);
 1485                 switch (name) {
 1486                 case SO_RCVTIMEO:
 1487                         /* FALLTHROUGH */
 1488                 case SO_SNDTIMEO:
 1489                         error = copyin(PTRIN(args->optval), &linux_tv,
 1490                             sizeof(linux_tv));
 1491                         if (error)
 1492                                 return (error);
 1493                         tv.tv_sec = linux_tv.tv_sec;
 1494                         tv.tv_usec = linux_tv.tv_usec;
 1495                         return (kern_setsockopt(td, args->s, bsd_args.level,
 1496                             name, &tv, UIO_SYSSPACE, sizeof(tv)));
 1497                         /* NOTREACHED */
 1498                         break;
 1499                 default:
 1500                         break;
 1501                 }
 1502                 break;
 1503         case IPPROTO_IP:
 1504                 name = linux_to_bsd_ip_sockopt(args->optname);
 1505                 break;
 1506         case IPPROTO_TCP:
 1507                 /* Linux TCP option values match BSD's */
 1508                 name = args->optname;
 1509                 break;
 1510         default:
 1511                 name = -1;
 1512                 break;
 1513         }
 1514         if (name == -1)
 1515                 return (ENOPROTOOPT);
 1516 
 1517         bsd_args.name = name;
 1518         bsd_args.val = PTRIN(args->optval);
 1519         bsd_args.valsize = args->optlen;
 1520 
 1521         if (name == IPV6_NEXTHOP) {
 1522                 linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
 1523                         bsd_args.valsize);
 1524                 error = setsockopt(td, &bsd_args);
 1525                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1526         } else
 1527                 error = setsockopt(td, &bsd_args);
 1528 
 1529         return (error);
 1530 }
 1531 
 1532 struct linux_getsockopt_args {
 1533         int s;
 1534         int level;
 1535         int optname;
 1536         l_uintptr_t optval;
 1537         l_uintptr_t optlen;
 1538 };
 1539 
 1540 static int
 1541 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1542 {
 1543         struct getsockopt_args /* {
 1544                 int s;
 1545                 int level;
 1546                 int name;
 1547                 caddr_t val;
 1548                 int *avalsize;
 1549         } */ bsd_args;
 1550         l_timeval linux_tv;
 1551         struct timeval tv;
 1552         socklen_t tv_len, xulen;
 1553         struct xucred xu;
 1554         struct l_ucred lxu;
 1555         int error, name;
 1556 
 1557         bsd_args.s = args->s;
 1558         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1559         switch (bsd_args.level) {
 1560         case SOL_SOCKET:
 1561                 name = linux_to_bsd_so_sockopt(args->optname);
 1562                 switch (name) {
 1563                 case SO_RCVTIMEO:
 1564                         /* FALLTHROUGH */
 1565                 case SO_SNDTIMEO:
 1566                         tv_len = sizeof(tv);
 1567                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1568                             name, &tv, UIO_SYSSPACE, &tv_len);
 1569                         if (error)
 1570                                 return (error);
 1571                         linux_tv.tv_sec = tv.tv_sec;
 1572                         linux_tv.tv_usec = tv.tv_usec;
 1573                         return (copyout(&linux_tv, PTRIN(args->optval),
 1574                             sizeof(linux_tv)));
 1575                         /* NOTREACHED */
 1576                         break;
 1577                 case LOCAL_PEERCRED:
 1578                         if (args->optlen != sizeof(lxu))
 1579                                 return (EINVAL);
 1580                         xulen = sizeof(xu);
 1581                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1582                             name, &xu, UIO_SYSSPACE, &xulen);
 1583                         if (error)
 1584                                 return (error);
 1585                         /*
 1586                          * XXX Use 0 for pid as the FreeBSD does not cache peer pid.
 1587                          */
 1588                         lxu.pid = 0;
 1589                         lxu.uid = xu.cr_uid;
 1590                         lxu.gid = xu.cr_gid;
 1591                         return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
 1592                         /* NOTREACHED */
 1593                         break;
 1594                 default:
 1595                         break;
 1596                 }
 1597                 break;
 1598         case IPPROTO_IP:
 1599                 name = linux_to_bsd_ip_sockopt(args->optname);
 1600                 break;
 1601         case IPPROTO_TCP:
 1602                 /* Linux TCP option values match BSD's */
 1603                 name = args->optname;
 1604                 break;
 1605         default:
 1606                 name = -1;
 1607                 break;
 1608         }
 1609         if (name == -1)
 1610                 return (EINVAL);
 1611 
 1612         bsd_args.name = name;
 1613         bsd_args.val = PTRIN(args->optval);
 1614         bsd_args.avalsize = PTRIN(args->optlen);
 1615 
 1616         if (name == IPV6_NEXTHOP) {
 1617                 error = getsockopt(td, &bsd_args);
 1618                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1619         } else
 1620                 error = getsockopt(td, &bsd_args);
 1621 
 1622         return (error);
 1623 }
 1624 
 1625 /* Argument list sizes for linux_socketcall */
 1626 
 1627 #define LINUX_AL(x) ((x) * sizeof(l_ulong))
 1628 
 1629 static const unsigned char lxs_args[] = {
 1630         LINUX_AL(0) /* unused*/,        LINUX_AL(3) /* socket */,
 1631         LINUX_AL(3) /* bind */,         LINUX_AL(3) /* connect */,
 1632         LINUX_AL(2) /* listen */,       LINUX_AL(3) /* accept */,
 1633         LINUX_AL(3) /* getsockname */,  LINUX_AL(3) /* getpeername */,
 1634         LINUX_AL(4) /* socketpair */,   LINUX_AL(4) /* send */,
 1635         LINUX_AL(4) /* recv */,         LINUX_AL(6) /* sendto */,
 1636         LINUX_AL(6) /* recvfrom */,     LINUX_AL(2) /* shutdown */,
 1637         LINUX_AL(5) /* setsockopt */,   LINUX_AL(5) /* getsockopt */,
 1638         LINUX_AL(3) /* sendmsg */,      LINUX_AL(3) /* recvmsg */,
 1639         LINUX_AL(4) /* accept4 */
 1640 };
 1641 
 1642 #define LINUX_AL_SIZE   sizeof(lxs_args) / sizeof(lxs_args[0]) - 1
 1643 
 1644 int
 1645 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1646 {
 1647         l_ulong a[6];
 1648         void *arg;
 1649         int error;
 1650 
 1651         if (args->what < LINUX_SOCKET || args->what > LINUX_AL_SIZE)
 1652                 return (EINVAL);
 1653         error = copyin(PTRIN(args->args), a, lxs_args[args->what]);
 1654         if (error)
 1655                 return (error);
 1656 
 1657         arg = a;
 1658         switch (args->what) {
 1659         case LINUX_SOCKET:
 1660                 return (linux_socket(td, arg));
 1661         case LINUX_BIND:
 1662                 return (linux_bind(td, arg));
 1663         case LINUX_CONNECT:
 1664                 return (linux_connect(td, arg));
 1665         case LINUX_LISTEN:
 1666                 return (linux_listen(td, arg));
 1667         case LINUX_ACCEPT:
 1668                 return (linux_accept(td, arg));
 1669         case LINUX_GETSOCKNAME:
 1670                 return (linux_getsockname(td, arg));
 1671         case LINUX_GETPEERNAME:
 1672                 return (linux_getpeername(td, arg));
 1673         case LINUX_SOCKETPAIR:
 1674                 return (linux_socketpair(td, arg));
 1675         case LINUX_SEND:
 1676                 return (linux_send(td, arg));
 1677         case LINUX_RECV:
 1678                 return (linux_recv(td, arg));
 1679         case LINUX_SENDTO:
 1680                 return (linux_sendto(td, arg));
 1681         case LINUX_RECVFROM:
 1682                 return (linux_recvfrom(td, arg));
 1683         case LINUX_SHUTDOWN:
 1684                 return (linux_shutdown(td, arg));
 1685         case LINUX_SETSOCKOPT:
 1686                 return (linux_setsockopt(td, arg));
 1687         case LINUX_GETSOCKOPT:
 1688                 return (linux_getsockopt(td, arg));
 1689         case LINUX_SENDMSG:
 1690                 return (linux_sendmsg(td, arg));
 1691         case LINUX_RECVMSG:
 1692                 return (linux_recvmsg(td, arg));
 1693         case LINUX_ACCEPT4:
 1694                 return (linux_accept4(td, arg));
 1695         }
 1696 
 1697         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1698         return (ENOSYS);
 1699 }

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