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/10.0/sys/compat/linux/linux_socket.c 255219 2013-09-05 00:09:56Z pjd $");
   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/capability.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 <netinet/in.h>
   57 #include <netinet/in_systm.h>
   58 #include <netinet/ip.h>
   59 #include <netinet/tcp.h>
   60 #ifdef INET6
   61 #include <netinet/ip6.h>
   62 #include <netinet6/ip6_var.h>
   63 #include <netinet6/in6_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_socket.h>
   74 #include <compat/linux/linux_util.h>
   75 
   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  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   82  * family and convert to sockaddr.
   83  */
   84 static int
   85 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int salen)
   86 {
   87         struct sockaddr *sa;
   88         struct osockaddr *kosa;
   89 #ifdef INET6
   90         struct sockaddr_in6 *sin6;
   91         int oldv6size;
   92 #endif
   93         char *name;
   94         int bdom, error, hdrlen, namelen;
   95 
   96         if (salen < 2 || salen > UCHAR_MAX || !osa)
   97                 return (EINVAL);
   98 
   99 #ifdef INET6
  100         oldv6size = 0;
  101         /*
  102          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  103          * if it's a v4-mapped address, so reserve the proper space
  104          * for it.
  105          */
  106         if (salen == sizeof(struct sockaddr_in6) - sizeof(uint32_t)) {
  107                 salen += sizeof(uint32_t);
  108                 oldv6size = 1;
  109         }
  110 #endif
  111 
  112         kosa = malloc(salen, M_SONAME, M_WAITOK);
  113 
  114         if ((error = copyin(osa, kosa, salen)))
  115                 goto out;
  116 
  117         bdom = linux_to_bsd_domain(kosa->sa_family);
  118         if (bdom == -1) {
  119                 error = EAFNOSUPPORT;
  120                 goto out;
  121         }
  122 
  123 #ifdef INET6
  124         /*
  125          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  126          * which lacks the scope id compared with RFC2553 one. If we detect
  127          * the situation, reject the address and write a message to system log.
  128          *
  129          * Still accept addresses for which the scope id is not used.
  130          */
  131         if (oldv6size) {
  132                 if (bdom == AF_INET6) {
  133                         sin6 = (struct sockaddr_in6 *)kosa;
  134                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  135                             (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  136                              !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  137                              !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  138                              !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  139                              !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  140                                 sin6->sin6_scope_id = 0;
  141                         } else {
  142                                 log(LOG_DEBUG,
  143                                     "obsolete pre-RFC2553 sockaddr_in6 rejected\n");
  144                                 error = EINVAL;
  145                                 goto out;
  146                         }
  147                 } else
  148                         salen -= sizeof(uint32_t);
  149         }
  150 #endif
  151         if (bdom == AF_INET) {
  152                 if (salen < sizeof(struct sockaddr_in)) {
  153                         error = EINVAL;
  154                         goto out;
  155                 }
  156                 salen = sizeof(struct sockaddr_in);
  157         }
  158 
  159         if (bdom == AF_LOCAL && salen > sizeof(struct sockaddr_un)) {
  160                 hdrlen = offsetof(struct sockaddr_un, sun_path);
  161                 name = ((struct sockaddr_un *)kosa)->sun_path;
  162                 if (*name == '\0') {
  163                         /*
  164                          * Linux abstract namespace starts with a NULL byte.
  165                          * XXX We do not support abstract namespace yet.
  166                          */
  167                         namelen = strnlen(name + 1, salen - hdrlen - 1) + 1;
  168                 } else
  169                         namelen = strnlen(name, salen - hdrlen);
  170                 salen = hdrlen + namelen;
  171                 if (salen > sizeof(struct sockaddr_un)) {
  172                         error = ENAMETOOLONG;
  173                         goto out;
  174                 }
  175         }
  176 
  177         sa = (struct sockaddr *)kosa;
  178         sa->sa_family = bdom;
  179         sa->sa_len = salen;
  180 
  181         *sap = sa;
  182         return (0);
  183 
  184 out:
  185         free(kosa, M_SONAME);
  186         return (error);
  187 }
  188 
  189 static int
  190 linux_to_bsd_domain(int domain)
  191 {
  192 
  193         switch (domain) {
  194         case LINUX_AF_UNSPEC:
  195                 return (AF_UNSPEC);
  196         case LINUX_AF_UNIX:
  197                 return (AF_LOCAL);
  198         case LINUX_AF_INET:
  199                 return (AF_INET);
  200         case LINUX_AF_INET6:
  201                 return (AF_INET6);
  202         case LINUX_AF_AX25:
  203                 return (AF_CCITT);
  204         case LINUX_AF_IPX:
  205                 return (AF_IPX);
  206         case LINUX_AF_APPLETALK:
  207                 return (AF_APPLETALK);
  208         }
  209         return (-1);
  210 }
  211 
  212 static int
  213 bsd_to_linux_domain(int domain)
  214 {
  215 
  216         switch (domain) {
  217         case AF_UNSPEC:
  218                 return (LINUX_AF_UNSPEC);
  219         case AF_LOCAL:
  220                 return (LINUX_AF_UNIX);
  221         case AF_INET:
  222                 return (LINUX_AF_INET);
  223         case AF_INET6:
  224                 return (LINUX_AF_INET6);
  225         case AF_CCITT:
  226                 return (LINUX_AF_AX25);
  227         case AF_IPX:
  228                 return (LINUX_AF_IPX);
  229         case AF_APPLETALK:
  230                 return (LINUX_AF_APPLETALK);
  231         }
  232         return (-1);
  233 }
  234 
  235 static int
  236 linux_to_bsd_sockopt_level(int level)
  237 {
  238 
  239         switch (level) {
  240         case LINUX_SOL_SOCKET:
  241                 return (SOL_SOCKET);
  242         }
  243         return (level);
  244 }
  245 
  246 static int
  247 bsd_to_linux_sockopt_level(int level)
  248 {
  249 
  250         switch (level) {
  251         case SOL_SOCKET:
  252                 return (LINUX_SOL_SOCKET);
  253         }
  254         return (level);
  255 }
  256 
  257 static int
  258 linux_to_bsd_ip_sockopt(int opt)
  259 {
  260 
  261         switch (opt) {
  262         case LINUX_IP_TOS:
  263                 return (IP_TOS);
  264         case LINUX_IP_TTL:
  265                 return (IP_TTL);
  266         case LINUX_IP_OPTIONS:
  267                 return (IP_OPTIONS);
  268         case LINUX_IP_MULTICAST_IF:
  269                 return (IP_MULTICAST_IF);
  270         case LINUX_IP_MULTICAST_TTL:
  271                 return (IP_MULTICAST_TTL);
  272         case LINUX_IP_MULTICAST_LOOP:
  273                 return (IP_MULTICAST_LOOP);
  274         case LINUX_IP_ADD_MEMBERSHIP:
  275                 return (IP_ADD_MEMBERSHIP);
  276         case LINUX_IP_DROP_MEMBERSHIP:
  277                 return (IP_DROP_MEMBERSHIP);
  278         case LINUX_IP_HDRINCL:
  279                 return (IP_HDRINCL);
  280         }
  281         return (-1);
  282 }
  283 
  284 static int
  285 linux_to_bsd_so_sockopt(int opt)
  286 {
  287 
  288         switch (opt) {
  289         case LINUX_SO_DEBUG:
  290                 return (SO_DEBUG);
  291         case LINUX_SO_REUSEADDR:
  292                 return (SO_REUSEADDR);
  293         case LINUX_SO_TYPE:
  294                 return (SO_TYPE);
  295         case LINUX_SO_ERROR:
  296                 return (SO_ERROR);
  297         case LINUX_SO_DONTROUTE:
  298                 return (SO_DONTROUTE);
  299         case LINUX_SO_BROADCAST:
  300                 return (SO_BROADCAST);
  301         case LINUX_SO_SNDBUF:
  302                 return (SO_SNDBUF);
  303         case LINUX_SO_RCVBUF:
  304                 return (SO_RCVBUF);
  305         case LINUX_SO_KEEPALIVE:
  306                 return (SO_KEEPALIVE);
  307         case LINUX_SO_OOBINLINE:
  308                 return (SO_OOBINLINE);
  309         case LINUX_SO_LINGER:
  310                 return (SO_LINGER);
  311         case LINUX_SO_PEERCRED:
  312                 return (LOCAL_PEERCRED);
  313         case LINUX_SO_RCVLOWAT:
  314                 return (SO_RCVLOWAT);
  315         case LINUX_SO_SNDLOWAT:
  316                 return (SO_SNDLOWAT);
  317         case LINUX_SO_RCVTIMEO:
  318                 return (SO_RCVTIMEO);
  319         case LINUX_SO_SNDTIMEO:
  320                 return (SO_SNDTIMEO);
  321         case LINUX_SO_TIMESTAMP:
  322                 return (SO_TIMESTAMP);
  323         case LINUX_SO_ACCEPTCONN:
  324                 return (SO_ACCEPTCONN);
  325         }
  326         return (-1);
  327 }
  328 
  329 static int
  330 linux_to_bsd_tcp_sockopt(int opt)
  331 {
  332 
  333         switch (opt) {
  334         case LINUX_TCP_NODELAY:
  335                 return (TCP_NODELAY);
  336         case LINUX_TCP_MAXSEG:
  337                 return (TCP_MAXSEG);
  338         case LINUX_TCP_KEEPIDLE:
  339                 return (TCP_KEEPIDLE);
  340         case LINUX_TCP_KEEPINTVL:
  341                 return (TCP_KEEPINTVL);
  342         case LINUX_TCP_KEEPCNT:
  343                 return (TCP_KEEPCNT);
  344         case LINUX_TCP_MD5SIG:
  345                 return (TCP_MD5SIG);
  346         }
  347         return (-1);
  348 }
  349 
  350 static int
  351 linux_to_bsd_msg_flags(int flags)
  352 {
  353         int ret_flags = 0;
  354 
  355         if (flags & LINUX_MSG_OOB)
  356                 ret_flags |= MSG_OOB;
  357         if (flags & LINUX_MSG_PEEK)
  358                 ret_flags |= MSG_PEEK;
  359         if (flags & LINUX_MSG_DONTROUTE)
  360                 ret_flags |= MSG_DONTROUTE;
  361         if (flags & LINUX_MSG_CTRUNC)
  362                 ret_flags |= MSG_CTRUNC;
  363         if (flags & LINUX_MSG_TRUNC)
  364                 ret_flags |= MSG_TRUNC;
  365         if (flags & LINUX_MSG_DONTWAIT)
  366                 ret_flags |= MSG_DONTWAIT;
  367         if (flags & LINUX_MSG_EOR)
  368                 ret_flags |= MSG_EOR;
  369         if (flags & LINUX_MSG_WAITALL)
  370                 ret_flags |= MSG_WAITALL;
  371         if (flags & LINUX_MSG_NOSIGNAL)
  372                 ret_flags |= MSG_NOSIGNAL;
  373 #if 0 /* not handled */
  374         if (flags & LINUX_MSG_PROXY)
  375                 ;
  376         if (flags & LINUX_MSG_FIN)
  377                 ;
  378         if (flags & LINUX_MSG_SYN)
  379                 ;
  380         if (flags & LINUX_MSG_CONFIRM)
  381                 ;
  382         if (flags & LINUX_MSG_RST)
  383                 ;
  384         if (flags & LINUX_MSG_ERRQUEUE)
  385                 ;
  386 #endif
  387         return ret_flags;
  388 }
  389 
  390 /*
  391 * If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
  392 * native syscall will fault.  Thus, we don't really need to check the
  393 * return values for these functions.
  394 */
  395 
  396 static int
  397 bsd_to_linux_sockaddr(struct sockaddr *arg)
  398 {
  399         struct sockaddr sa;
  400         size_t sa_len = sizeof(struct sockaddr);
  401         int error;
  402         
  403         if ((error = copyin(arg, &sa, sa_len)))
  404                 return (error);
  405         
  406         *(u_short *)&sa = sa.sa_family;
  407         
  408         error = copyout(&sa, arg, sa_len);
  409         
  410         return (error);
  411 }
  412 
  413 static int
  414 linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
  415 {
  416         struct sockaddr sa;
  417         size_t sa_len = sizeof(struct sockaddr);
  418         int error;
  419 
  420         if ((error = copyin(arg, &sa, sa_len)))
  421                 return (error);
  422 
  423         sa.sa_family = *(sa_family_t *)&sa;
  424         sa.sa_len = len;
  425 
  426         error = copyout(&sa, arg, sa_len);
  427 
  428         return (error);
  429 }
  430 
  431 
  432 static int
  433 linux_sa_put(struct osockaddr *osa)
  434 {
  435         struct osockaddr sa;
  436         int error, bdom;
  437 
  438         /*
  439          * Only read/write the osockaddr family part, the rest is
  440          * not changed.
  441          */
  442         error = copyin(osa, &sa, sizeof(sa.sa_family));
  443         if (error)
  444                 return (error);
  445 
  446         bdom = bsd_to_linux_domain(sa.sa_family);
  447         if (bdom == -1)
  448                 return (EINVAL);
  449 
  450         sa.sa_family = bdom;
  451         error = copyout(&sa, osa, sizeof(sa.sa_family));
  452         if (error)
  453                 return (error);
  454 
  455         return (0);
  456 }
  457 
  458 static int
  459 linux_to_bsd_cmsg_type(int cmsg_type)
  460 {
  461 
  462         switch (cmsg_type) {
  463         case LINUX_SCM_RIGHTS:
  464                 return (SCM_RIGHTS);
  465         case LINUX_SCM_CREDENTIALS:
  466                 return (SCM_CREDS);
  467         }
  468         return (-1);
  469 }
  470 
  471 static int
  472 bsd_to_linux_cmsg_type(int cmsg_type)
  473 {
  474 
  475         switch (cmsg_type) {
  476         case SCM_RIGHTS:
  477                 return (LINUX_SCM_RIGHTS);
  478         case SCM_CREDS:
  479                 return (LINUX_SCM_CREDENTIALS);
  480         }
  481         return (-1);
  482 }
  483 
  484 static int
  485 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
  486 {
  487         if (lhdr->msg_controllen > INT_MAX)
  488                 return (ENOBUFS);
  489 
  490         bhdr->msg_name          = PTRIN(lhdr->msg_name);
  491         bhdr->msg_namelen       = lhdr->msg_namelen;
  492         bhdr->msg_iov           = PTRIN(lhdr->msg_iov);
  493         bhdr->msg_iovlen        = lhdr->msg_iovlen;
  494         bhdr->msg_control       = PTRIN(lhdr->msg_control);
  495 
  496         /*
  497          * msg_controllen is skipped since BSD and LINUX control messages
  498          * are potentially different sizes (e.g. the cred structure used
  499          * by SCM_CREDS is different between the two operating system).
  500          *
  501          * The caller can set it (if necessary) after converting all the
  502          * control messages.
  503          */
  504 
  505         bhdr->msg_flags         = linux_to_bsd_msg_flags(lhdr->msg_flags);
  506         return (0);
  507 }
  508 
  509 static int
  510 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
  511 {
  512         lhdr->msg_name          = PTROUT(bhdr->msg_name);
  513         lhdr->msg_namelen       = bhdr->msg_namelen;
  514         lhdr->msg_iov           = PTROUT(bhdr->msg_iov);
  515         lhdr->msg_iovlen        = bhdr->msg_iovlen;
  516         lhdr->msg_control       = PTROUT(bhdr->msg_control);
  517 
  518         /*
  519          * msg_controllen is skipped since BSD and LINUX control messages
  520          * are potentially different sizes (e.g. the cred structure used
  521          * by SCM_CREDS is different between the two operating system).
  522          *
  523          * The caller can set it (if necessary) after converting all the
  524          * control messages.
  525          */
  526 
  527         /* msg_flags skipped */
  528         return (0);
  529 }
  530 
  531 static int
  532 linux_set_socket_flags(struct thread *td, int s, int flags)
  533 {
  534         int error;
  535 
  536         if (flags & LINUX_SOCK_NONBLOCK) {
  537                 error = kern_fcntl(td, s, F_SETFL, O_NONBLOCK);
  538                 if (error)
  539                         return (error);
  540         }
  541         if (flags & LINUX_SOCK_CLOEXEC) {
  542                 error = kern_fcntl(td, s, F_SETFD, FD_CLOEXEC);
  543                 if (error)
  544                         return (error);
  545         }
  546         return (0);
  547 }
  548 
  549 static int
  550 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  551     struct mbuf *control, enum uio_seg segflg)
  552 {
  553         struct sockaddr *to;
  554         int error;
  555 
  556         if (mp->msg_name != NULL) {
  557                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  558                 if (error)
  559                         return (error);
  560                 mp->msg_name = to;
  561         } else
  562                 to = NULL;
  563 
  564         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  565             segflg);
  566 
  567         if (to)
  568                 free(to, M_SONAME);
  569         return (error);
  570 }
  571 
  572 /* Return 0 if IP_HDRINCL is set for the given socket. */
  573 static int
  574 linux_check_hdrincl(struct thread *td, int s)
  575 {
  576         int error, optval, size_val;
  577 
  578         size_val = sizeof(optval);
  579         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  580             &optval, UIO_SYSSPACE, &size_val);
  581         if (error)
  582                 return (error);
  583 
  584         return (optval == 0);
  585 }
  586 
  587 struct linux_sendto_args {
  588         int s;
  589         l_uintptr_t msg;
  590         int len;
  591         int flags;
  592         l_uintptr_t to;
  593         int tolen;
  594 };
  595 
  596 /*
  597  * Updated sendto() when IP_HDRINCL is set:
  598  * tweak endian-dependent fields in the IP packet.
  599  */
  600 static int
  601 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  602 {
  603 /*
  604  * linux_ip_copysize defines how many bytes we should copy
  605  * from the beginning of the IP packet before we customize it for BSD.
  606  * It should include all the fields we modify (ip_len and ip_off).
  607  */
  608 #define linux_ip_copysize       8
  609 
  610         struct ip *packet;
  611         struct msghdr msg;
  612         struct iovec aiov[1];
  613         int error;
  614 
  615         /* Check that the packet isn't too big or too small. */
  616         if (linux_args->len < linux_ip_copysize ||
  617             linux_args->len > IP_MAXPACKET)
  618                 return (EINVAL);
  619 
  620         packet = (struct ip *)malloc(linux_args->len, M_TEMP, M_WAITOK);
  621 
  622         /* Make kernel copy of the packet to be sent */
  623         if ((error = copyin(PTRIN(linux_args->msg), packet,
  624             linux_args->len)))
  625                 goto goout;
  626 
  627         /* Convert fields from Linux to BSD raw IP socket format */
  628         packet->ip_len = linux_args->len;
  629         packet->ip_off = ntohs(packet->ip_off);
  630 
  631         /* Prepare the msghdr and iovec structures describing the new packet */
  632         msg.msg_name = PTRIN(linux_args->to);
  633         msg.msg_namelen = linux_args->tolen;
  634         msg.msg_iov = aiov;
  635         msg.msg_iovlen = 1;
  636         msg.msg_control = NULL;
  637         msg.msg_flags = 0;
  638         aiov[0].iov_base = (char *)packet;
  639         aiov[0].iov_len = linux_args->len;
  640         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  641             NULL, UIO_SYSSPACE);
  642 goout:
  643         free(packet, M_TEMP);
  644         return (error);
  645 }
  646 
  647 struct linux_socket_args {
  648         int domain;
  649         int type;
  650         int protocol;
  651 };
  652 
  653 static int
  654 linux_socket(struct thread *td, struct linux_socket_args *args)
  655 {
  656         struct socket_args /* {
  657                 int domain;
  658                 int type;
  659                 int protocol;
  660         } */ bsd_args;
  661         int retval_socket, socket_flags;
  662 
  663         bsd_args.protocol = args->protocol;
  664         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  665         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  666                 return (EINVAL);
  667         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  668         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  669                 return (EINVAL);
  670         bsd_args.domain = linux_to_bsd_domain(args->domain);
  671         if (bsd_args.domain == -1)
  672                 return (EAFNOSUPPORT);
  673 
  674         retval_socket = sys_socket(td, &bsd_args);
  675         if (retval_socket)
  676                 return (retval_socket);
  677 
  678         retval_socket = linux_set_socket_flags(td, td->td_retval[0],
  679             socket_flags);
  680         if (retval_socket) {
  681                 (void)kern_close(td, td->td_retval[0]);
  682                 goto out;
  683         }
  684 
  685         if (bsd_args.type == SOCK_RAW
  686             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  687             && bsd_args.domain == PF_INET) {
  688                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  689                 int hdrincl;
  690 
  691                 hdrincl = 1;
  692                 /* We ignore any error returned by kern_setsockopt() */
  693                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  694                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  695         }
  696 #ifdef INET6
  697         /*
  698          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
  699          * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
  700          * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
  701          * sysctl value.
  702          */
  703         if (bsd_args.domain == PF_INET6) {
  704                 int v6only;
  705 
  706                 v6only = 0;
  707                 /* We ignore any error returned by setsockopt() */
  708                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  709                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  710         }
  711 #endif
  712 
  713 out:
  714         return (retval_socket);
  715 }
  716 
  717 struct linux_bind_args {
  718         int s;
  719         l_uintptr_t name;
  720         int namelen;
  721 };
  722 
  723 static int
  724 linux_bind(struct thread *td, struct linux_bind_args *args)
  725 {
  726         struct sockaddr *sa;
  727         int error;
  728 
  729         error = linux_getsockaddr(&sa, PTRIN(args->name),
  730             args->namelen);
  731         if (error)
  732                 return (error);
  733 
  734         error = kern_bind(td, args->s, sa);
  735         free(sa, M_SONAME);
  736         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  737                 return (EINVAL);
  738         return (error);
  739 }
  740 
  741 struct linux_connect_args {
  742         int s;
  743         l_uintptr_t name;
  744         int namelen;
  745 };
  746 int linux_connect(struct thread *, struct linux_connect_args *);
  747 
  748 int
  749 linux_connect(struct thread *td, struct linux_connect_args *args)
  750 {
  751         cap_rights_t rights;
  752         struct socket *so;
  753         struct sockaddr *sa;
  754         u_int fflag;
  755         int error;
  756 
  757         error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
  758             args->namelen);
  759         if (error)
  760                 return (error);
  761 
  762         error = kern_connect(td, args->s, sa);
  763         free(sa, M_SONAME);
  764         if (error != EISCONN)
  765                 return (error);
  766 
  767         /*
  768          * Linux doesn't return EISCONN the first time it occurs,
  769          * when on a non-blocking socket. Instead it returns the
  770          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  771          *
  772          * XXXRW: Instead of using fgetsock(), check that it is a
  773          * socket and use the file descriptor reference instead of
  774          * creating a new one.
  775          */
  776         error = fgetsock(td, args->s, cap_rights_init(&rights, CAP_CONNECT),
  777             &so, &fflag);
  778         if (error == 0) {
  779                 error = EISCONN;
  780                 if (fflag & FNONBLOCK) {
  781                         SOCK_LOCK(so);
  782                         if (so->so_emuldata == 0)
  783                                 error = so->so_error;
  784                         so->so_emuldata = (void *)1;
  785                         SOCK_UNLOCK(so);
  786                 }
  787                 fputsock(so);
  788         }
  789         return (error);
  790 }
  791 
  792 struct linux_listen_args {
  793         int s;
  794         int backlog;
  795 };
  796 
  797 static int
  798 linux_listen(struct thread *td, struct linux_listen_args *args)
  799 {
  800         struct listen_args /* {
  801                 int s;
  802                 int backlog;
  803         } */ bsd_args;
  804 
  805         bsd_args.s = args->s;
  806         bsd_args.backlog = args->backlog;
  807         return (sys_listen(td, &bsd_args));
  808 }
  809 
  810 static int
  811 linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
  812     l_uintptr_t namelen, int flags)
  813 {
  814         struct accept_args /* {
  815                 int     s;
  816                 struct sockaddr * __restrict name;
  817                 socklen_t * __restrict anamelen;
  818         } */ bsd_args;
  819         int error;
  820 
  821         if (flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  822                 return (EINVAL);
  823 
  824         bsd_args.s = s;
  825         /* XXX: */
  826         bsd_args.name = (struct sockaddr * __restrict)PTRIN(addr);
  827         bsd_args.anamelen = PTRIN(namelen);/* XXX */
  828         error = sys_accept(td, &bsd_args);
  829         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
  830         if (error) {
  831                 if (error == EFAULT && namelen != sizeof(struct sockaddr_in))
  832                         return (EINVAL);
  833                 return (error);
  834         }
  835 
  836         /*
  837          * linux appears not to copy flags from the parent socket to the
  838          * accepted one, so we must clear the flags in the new descriptor
  839          * and apply the requested flags.
  840          */
  841         error = kern_fcntl(td, td->td_retval[0], F_SETFL, 0);
  842         if (error)
  843                 goto out;
  844         error = linux_set_socket_flags(td, td->td_retval[0], flags);
  845         if (error)
  846                 goto out;
  847         if (addr)
  848                 error = linux_sa_put(PTRIN(addr));
  849 
  850 out:
  851         if (error) {
  852                 (void)kern_close(td, td->td_retval[0]);
  853                 td->td_retval[0] = 0;
  854         }
  855         return (error);
  856 }
  857 
  858 struct linux_accept_args {
  859         int s;
  860         l_uintptr_t addr;
  861         l_uintptr_t namelen;
  862 };
  863 
  864 static int
  865 linux_accept(struct thread *td, struct linux_accept_args *args)
  866 {
  867 
  868         return (linux_accept_common(td, args->s, args->addr,
  869             args->namelen, 0));
  870 }
  871 
  872 struct linux_accept4_args {
  873         int s;
  874         l_uintptr_t addr;
  875         l_uintptr_t namelen;
  876         int flags;
  877 };
  878 
  879 static int
  880 linux_accept4(struct thread *td, struct linux_accept4_args *args)
  881 {
  882 
  883         return (linux_accept_common(td, args->s, args->addr,
  884             args->namelen, args->flags));
  885 }
  886 
  887 struct linux_getsockname_args {
  888         int s;
  889         l_uintptr_t addr;
  890         l_uintptr_t namelen;
  891 };
  892 
  893 static int
  894 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  895 {
  896         struct getsockname_args /* {
  897                 int     fdes;
  898                 struct sockaddr * __restrict asa;
  899                 socklen_t * __restrict alen;
  900         } */ bsd_args;
  901         int error;
  902 
  903         bsd_args.fdes = args->s;
  904         /* XXX: */
  905         bsd_args.asa = (struct sockaddr * __restrict)PTRIN(args->addr);
  906         bsd_args.alen = PTRIN(args->namelen);   /* XXX */
  907         error = sys_getsockname(td, &bsd_args);
  908         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  909         if (error)
  910                 return (error);
  911         error = linux_sa_put(PTRIN(args->addr));
  912         if (error)
  913                 return (error);
  914         return (0);
  915 }
  916 
  917 struct linux_getpeername_args {
  918         int s;
  919         l_uintptr_t addr;
  920         l_uintptr_t namelen;
  921 };
  922 
  923 static int
  924 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  925 {
  926         struct getpeername_args /* {
  927                 int fdes;
  928                 caddr_t asa;
  929                 int *alen;
  930         } */ bsd_args;
  931         int error;
  932 
  933         bsd_args.fdes = args->s;
  934         bsd_args.asa = (struct sockaddr *)PTRIN(args->addr);
  935         bsd_args.alen = (int *)PTRIN(args->namelen);
  936         error = sys_getpeername(td, &bsd_args);
  937         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  938         if (error)
  939                 return (error);
  940         error = linux_sa_put(PTRIN(args->addr));
  941         if (error)
  942                 return (error);
  943         return (0);
  944 }
  945 
  946 struct linux_socketpair_args {
  947         int domain;
  948         int type;
  949         int protocol;
  950         l_uintptr_t rsv;
  951 };
  952 
  953 static int
  954 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  955 {
  956         struct socketpair_args /* {
  957                 int domain;
  958                 int type;
  959                 int protocol;
  960                 int *rsv;
  961         } */ bsd_args;
  962         int error, socket_flags;
  963         int sv[2];
  964 
  965         bsd_args.domain = linux_to_bsd_domain(args->domain);
  966         if (bsd_args.domain != PF_LOCAL)
  967                 return (EAFNOSUPPORT);
  968 
  969         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  970         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  971                 return (EINVAL);
  972         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  973         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  974                 return (EINVAL);
  975 
  976         if (args->protocol != 0 && args->protocol != PF_UNIX)
  977 
  978                 /*
  979                  * Use of PF_UNIX as protocol argument is not right,
  980                  * but Linux does it.
  981                  * Do not map PF_UNIX as its Linux value is identical
  982                  * to FreeBSD one.
  983                  */
  984                 return (EPROTONOSUPPORT);
  985         else
  986                 bsd_args.protocol = 0;
  987         bsd_args.rsv = (int *)PTRIN(args->rsv);
  988         error = kern_socketpair(td, bsd_args.domain, bsd_args.type,
  989             bsd_args.protocol, sv);
  990         if (error)
  991                 return (error);
  992         error = linux_set_socket_flags(td, sv[0], socket_flags);
  993         if (error)
  994                 goto out;
  995         error = linux_set_socket_flags(td, sv[1], socket_flags);
  996         if (error)
  997                 goto out;
  998 
  999         error = copyout(sv, bsd_args.rsv, 2 * sizeof(int));
 1000 
 1001 out:
 1002         if (error) {
 1003                 (void)kern_close(td, sv[0]);
 1004                 (void)kern_close(td, sv[1]);
 1005         }
 1006         return (error);
 1007 }
 1008 
 1009 struct linux_send_args {
 1010         int s;
 1011         l_uintptr_t msg;
 1012         int len;
 1013         int flags;
 1014 };
 1015 
 1016 static int
 1017 linux_send(struct thread *td, struct linux_send_args *args)
 1018 {
 1019         struct sendto_args /* {
 1020                 int s;
 1021                 caddr_t buf;
 1022                 int len;
 1023                 int flags;
 1024                 caddr_t to;
 1025                 int tolen;
 1026         } */ bsd_args;
 1027 
 1028         bsd_args.s = args->s;
 1029         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1030         bsd_args.len = args->len;
 1031         bsd_args.flags = args->flags;
 1032         bsd_args.to = NULL;
 1033         bsd_args.tolen = 0;
 1034         return sys_sendto(td, &bsd_args);
 1035 }
 1036 
 1037 struct linux_recv_args {
 1038         int s;
 1039         l_uintptr_t msg;
 1040         int len;
 1041         int flags;
 1042 };
 1043 
 1044 static int
 1045 linux_recv(struct thread *td, struct linux_recv_args *args)
 1046 {
 1047         struct recvfrom_args /* {
 1048                 int s;
 1049                 caddr_t buf;
 1050                 int len;
 1051                 int flags;
 1052                 struct sockaddr *from;
 1053                 socklen_t fromlenaddr;
 1054         } */ bsd_args;
 1055 
 1056         bsd_args.s = args->s;
 1057         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1058         bsd_args.len = args->len;
 1059         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1060         bsd_args.from = NULL;
 1061         bsd_args.fromlenaddr = 0;
 1062         return (sys_recvfrom(td, &bsd_args));
 1063 }
 1064 
 1065 static int
 1066 linux_sendto(struct thread *td, struct linux_sendto_args *args)
 1067 {
 1068         struct msghdr msg;
 1069         struct iovec aiov;
 1070         int error;
 1071 
 1072         if (linux_check_hdrincl(td, args->s) == 0)
 1073                 /* IP_HDRINCL set, tweak the packet before sending */
 1074                 return (linux_sendto_hdrincl(td, args));
 1075 
 1076         msg.msg_name = PTRIN(args->to);
 1077         msg.msg_namelen = args->tolen;
 1078         msg.msg_iov = &aiov;
 1079         msg.msg_iovlen = 1;
 1080         msg.msg_control = NULL;
 1081         msg.msg_flags = 0;
 1082         aiov.iov_base = PTRIN(args->msg);
 1083         aiov.iov_len = args->len;
 1084         error = linux_sendit(td, args->s, &msg, args->flags, NULL,
 1085             UIO_USERSPACE);
 1086         return (error);
 1087 }
 1088 
 1089 struct linux_recvfrom_args {
 1090         int s;
 1091         l_uintptr_t buf;
 1092         int len;
 1093         int flags;
 1094         l_uintptr_t from;
 1095         l_uintptr_t fromlen;
 1096 };
 1097 
 1098 static int
 1099 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
 1100 {
 1101         struct recvfrom_args /* {
 1102                 int     s;
 1103                 caddr_t buf;
 1104                 size_t  len;
 1105                 int     flags;
 1106                 struct sockaddr * __restrict from;
 1107                 socklen_t * __restrict fromlenaddr;
 1108         } */ bsd_args;
 1109         size_t len;
 1110         int error;
 1111 
 1112         if ((error = copyin(PTRIN(args->fromlen), &len, sizeof(size_t))))
 1113                 return (error);
 1114 
 1115         bsd_args.s = args->s;
 1116         bsd_args.buf = PTRIN(args->buf);
 1117         bsd_args.len = args->len;
 1118         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1119         /* XXX: */
 1120         bsd_args.from = (struct sockaddr * __restrict)PTRIN(args->from);
 1121         bsd_args.fromlenaddr = PTRIN(args->fromlen);/* XXX */
 1122         
 1123         linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.from, len);
 1124         error = sys_recvfrom(td, &bsd_args);
 1125         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.from);
 1126         
 1127         if (error)
 1128                 return (error);
 1129         if (args->from) {
 1130                 error = linux_sa_put((struct osockaddr *)
 1131                     PTRIN(args->from));
 1132                 if (error)
 1133                         return (error);
 1134         }
 1135         return (0);
 1136 }
 1137 
 1138 struct linux_sendmsg_args {
 1139         int s;
 1140         l_uintptr_t msg;
 1141         int flags;
 1142 };
 1143 
 1144 static int
 1145 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
 1146 {
 1147         struct cmsghdr *cmsg;
 1148         struct cmsgcred cmcred;
 1149         struct mbuf *control;
 1150         struct msghdr msg;
 1151         struct l_cmsghdr linux_cmsg;
 1152         struct l_cmsghdr *ptr_cmsg;
 1153         struct l_msghdr linux_msg;
 1154         struct iovec *iov;
 1155         socklen_t datalen;
 1156         struct sockaddr *sa;
 1157         sa_family_t sa_family;
 1158         void *data;
 1159         int error;
 1160 
 1161         error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
 1162         if (error)
 1163                 return (error);
 1164 
 1165         /*
 1166          * Some Linux applications (ping) define a non-NULL control data
 1167          * pointer, but a msg_controllen of 0, which is not allowed in the
 1168          * FreeBSD system call interface.  NULL the msg_control pointer in
 1169          * order to handle this case.  This should be checked, but allows the
 1170          * Linux ping to work.
 1171          */
 1172         if (PTRIN(linux_msg.msg_control) != NULL && linux_msg.msg_controllen == 0)
 1173                 linux_msg.msg_control = PTROUT(NULL);
 1174 
 1175         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1176         if (error)
 1177                 return (error);
 1178 
 1179 #ifdef COMPAT_LINUX32
 1180         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1181             &iov, EMSGSIZE);
 1182 #else
 1183         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1184 #endif
 1185         if (error)
 1186                 return (error);
 1187 
 1188         control = NULL;
 1189         cmsg = NULL;
 1190 
 1191         if ((ptr_cmsg = LINUX_CMSG_FIRSTHDR(&linux_msg)) != NULL) {
 1192                 error = kern_getsockname(td, args->s, &sa, &datalen);
 1193                 if (error)
 1194                         goto bad;
 1195                 sa_family = sa->sa_family;
 1196                 free(sa, M_SONAME);
 1197 
 1198                 error = ENOBUFS;
 1199                 cmsg = malloc(CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
 1200                 control = m_get(M_WAITOK, MT_CONTROL);
 1201                 if (control == NULL)
 1202                         goto bad;
 1203 
 1204                 do {
 1205                         error = copyin(ptr_cmsg, &linux_cmsg,
 1206                             sizeof(struct l_cmsghdr));
 1207                         if (error)
 1208                                 goto bad;
 1209 
 1210                         error = EINVAL;
 1211                         if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr))
 1212                                 goto bad;
 1213 
 1214                         /*
 1215                          * Now we support only SCM_RIGHTS and SCM_CRED,
 1216                          * so return EINVAL in any other cmsg_type
 1217                          */
 1218                         cmsg->cmsg_type =
 1219                             linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
 1220                         cmsg->cmsg_level =
 1221                             linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
 1222                         if (cmsg->cmsg_type == -1
 1223                             || cmsg->cmsg_level != SOL_SOCKET)
 1224                                 goto bad;
 1225 
 1226                         /*
 1227                          * Some applications (e.g. pulseaudio) attempt to
 1228                          * send ancillary data even if the underlying protocol
 1229                          * doesn't support it which is not allowed in the
 1230                          * FreeBSD system call interface.
 1231                          */
 1232                         if (sa_family != AF_UNIX)
 1233                                 continue;
 1234 
 1235                         data = LINUX_CMSG_DATA(ptr_cmsg);
 1236                         datalen = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
 1237 
 1238                         switch (cmsg->cmsg_type)
 1239                         {
 1240                         case SCM_RIGHTS:
 1241                                 break;
 1242 
 1243                         case SCM_CREDS:
 1244                                 data = &cmcred;
 1245                                 datalen = sizeof(cmcred);
 1246 
 1247                                 /*
 1248                                  * The lower levels will fill in the structure
 1249                                  */
 1250                                 bzero(data, datalen);
 1251                                 break;
 1252                         }
 1253 
 1254                         cmsg->cmsg_len = CMSG_LEN(datalen);
 1255 
 1256                         error = ENOBUFS;
 1257                         if (!m_append(control, CMSG_HDRSZ, (c_caddr_t)cmsg))
 1258                                 goto bad;
 1259                         if (!m_append(control, datalen, (c_caddr_t)data))
 1260                                 goto bad;
 1261                 } while ((ptr_cmsg = LINUX_CMSG_NXTHDR(&linux_msg, ptr_cmsg)));
 1262 
 1263                 if (m_length(control, NULL) == 0) {
 1264                         m_freem(control);
 1265                         control = NULL;
 1266                 }
 1267         }
 1268 
 1269         msg.msg_iov = iov;
 1270         msg.msg_flags = 0;
 1271         error = linux_sendit(td, args->s, &msg, args->flags, control,
 1272             UIO_USERSPACE);
 1273 
 1274 bad:
 1275         free(iov, M_IOV);
 1276         if (cmsg)
 1277                 free(cmsg, M_TEMP);
 1278         return (error);
 1279 }
 1280 
 1281 struct linux_recvmsg_args {
 1282         int s;
 1283         l_uintptr_t msg;
 1284         int flags;
 1285 };
 1286 
 1287 static int
 1288 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
 1289 {
 1290         struct cmsghdr *cm;
 1291         struct cmsgcred *cmcred;
 1292         struct msghdr msg;
 1293         struct l_cmsghdr *linux_cmsg = NULL;
 1294         struct l_ucred linux_ucred;
 1295         socklen_t datalen, outlen;
 1296         struct l_msghdr linux_msg;
 1297         struct iovec *iov, *uiov;
 1298         struct mbuf *control = NULL;
 1299         struct mbuf **controlp;
 1300         caddr_t outbuf;
 1301         void *data;
 1302         int error, i, fd, fds, *fdp;
 1303 
 1304         error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
 1305         if (error)
 1306                 return (error);
 1307 
 1308         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1309         if (error)
 1310                 return (error);
 1311 
 1312 #ifdef COMPAT_LINUX32
 1313         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1314             &iov, EMSGSIZE);
 1315 #else
 1316         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1317 #endif
 1318         if (error)
 1319                 return (error);
 1320 
 1321         if (msg.msg_name) {
 1322                 error = linux_to_bsd_sockaddr((struct sockaddr *)msg.msg_name,
 1323                     msg.msg_namelen);
 1324                 if (error)
 1325                         goto bad;
 1326         }
 1327 
 1328         uiov = msg.msg_iov;
 1329         msg.msg_iov = iov;
 1330         controlp = (msg.msg_control != NULL) ? &control : NULL;
 1331         error = kern_recvit(td, args->s, &msg, UIO_USERSPACE, controlp);
 1332         msg.msg_iov = uiov;
 1333         if (error)
 1334                 goto bad;
 1335 
 1336         error = bsd_to_linux_msghdr(&msg, &linux_msg);
 1337         if (error)
 1338                 goto bad;
 1339 
 1340         if (linux_msg.msg_name) {
 1341                 error = bsd_to_linux_sockaddr((struct sockaddr *)
 1342                     PTRIN(linux_msg.msg_name));
 1343                 if (error)
 1344                         goto bad;
 1345         }
 1346         if (linux_msg.msg_name && linux_msg.msg_namelen > 2) {
 1347                 error = linux_sa_put(PTRIN(linux_msg.msg_name));
 1348                 if (error)
 1349                         goto bad;
 1350         }
 1351 
 1352         outbuf = PTRIN(linux_msg.msg_control);
 1353         outlen = 0;
 1354 
 1355         if (control) {
 1356                 linux_cmsg = malloc(L_CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
 1357 
 1358                 msg.msg_control = mtod(control, struct cmsghdr *);
 1359                 msg.msg_controllen = control->m_len;
 1360 
 1361                 cm = CMSG_FIRSTHDR(&msg);
 1362 
 1363                 while (cm != NULL) {
 1364                         linux_cmsg->cmsg_type =
 1365                             bsd_to_linux_cmsg_type(cm->cmsg_type);
 1366                         linux_cmsg->cmsg_level =
 1367                             bsd_to_linux_sockopt_level(cm->cmsg_level);
 1368                         if (linux_cmsg->cmsg_type == -1
 1369                             || cm->cmsg_level != SOL_SOCKET)
 1370                         {
 1371                                 error = EINVAL;
 1372                                 goto bad;
 1373                         }
 1374 
 1375                         data = CMSG_DATA(cm);
 1376                         datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1377 
 1378                         switch (cm->cmsg_type)
 1379                         {
 1380                         case SCM_RIGHTS:
 1381                                 if (args->flags & LINUX_MSG_CMSG_CLOEXEC) {
 1382                                         fds = datalen / sizeof(int);
 1383                                         fdp = data;
 1384                                         for (i = 0; i < fds; i++) {
 1385                                                 fd = *fdp++;
 1386                                                 (void)kern_fcntl(td, fd,
 1387                                                     F_SETFD, FD_CLOEXEC);
 1388                                         }
 1389                                 }
 1390                                 break;
 1391 
 1392                         case SCM_CREDS:
 1393                                 /*
 1394                                  * Currently LOCAL_CREDS is never in
 1395                                  * effect for Linux so no need to worry
 1396                                  * about sockcred
 1397                                  */
 1398                                 if (datalen != sizeof(*cmcred)) {
 1399                                         error = EMSGSIZE;
 1400                                         goto bad;
 1401                                 }
 1402                                 cmcred = (struct cmsgcred *)data;
 1403                                 bzero(&linux_ucred, sizeof(linux_ucred));
 1404                                 linux_ucred.pid = cmcred->cmcred_pid;
 1405                                 linux_ucred.uid = cmcred->cmcred_uid;
 1406                                 linux_ucred.gid = cmcred->cmcred_gid;
 1407                                 data = &linux_ucred;
 1408                                 datalen = sizeof(linux_ucred);
 1409                                 break;
 1410                         }
 1411 
 1412                         if (outlen + LINUX_CMSG_LEN(datalen) >
 1413                             linux_msg.msg_controllen) {
 1414                                 if (outlen == 0) {
 1415                                         error = EMSGSIZE;
 1416                                         goto bad;
 1417                                 } else {
 1418                                         linux_msg.msg_flags |=
 1419                                             LINUX_MSG_CTRUNC;
 1420                                         goto out;
 1421                                 }
 1422                         }
 1423 
 1424                         linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
 1425 
 1426                         error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
 1427                         if (error)
 1428                                 goto bad;
 1429                         outbuf += L_CMSG_HDRSZ;
 1430 
 1431                         error = copyout(data, outbuf, datalen);
 1432                         if (error)
 1433                                 goto bad;
 1434 
 1435                         outbuf += LINUX_CMSG_ALIGN(datalen);
 1436                         outlen += LINUX_CMSG_LEN(datalen);
 1437 
 1438                         cm = CMSG_NXTHDR(&msg, cm);
 1439                 }
 1440         }
 1441 
 1442 out:
 1443         linux_msg.msg_controllen = outlen;
 1444         error = copyout(&linux_msg, PTRIN(args->msg), sizeof(linux_msg));
 1445 
 1446 bad:
 1447         free(iov, M_IOV);
 1448         m_freem(control);
 1449         free(linux_cmsg, M_TEMP);
 1450 
 1451         return (error);
 1452 }
 1453 
 1454 struct linux_shutdown_args {
 1455         int s;
 1456         int how;
 1457 };
 1458 
 1459 static int
 1460 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1461 {
 1462         struct shutdown_args /* {
 1463                 int s;
 1464                 int how;
 1465         } */ bsd_args;
 1466 
 1467         bsd_args.s = args->s;
 1468         bsd_args.how = args->how;
 1469         return (sys_shutdown(td, &bsd_args));
 1470 }
 1471 
 1472 struct linux_setsockopt_args {
 1473         int s;
 1474         int level;
 1475         int optname;
 1476         l_uintptr_t optval;
 1477         int optlen;
 1478 };
 1479 
 1480 static int
 1481 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1482 {
 1483         struct setsockopt_args /* {
 1484                 int s;
 1485                 int level;
 1486                 int name;
 1487                 caddr_t val;
 1488                 int valsize;
 1489         } */ bsd_args;
 1490         l_timeval linux_tv;
 1491         struct timeval tv;
 1492         int error, name;
 1493 
 1494         bsd_args.s = args->s;
 1495         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1496         switch (bsd_args.level) {
 1497         case SOL_SOCKET:
 1498                 name = linux_to_bsd_so_sockopt(args->optname);
 1499                 switch (name) {
 1500                 case SO_RCVTIMEO:
 1501                         /* FALLTHROUGH */
 1502                 case SO_SNDTIMEO:
 1503                         error = copyin(PTRIN(args->optval), &linux_tv,
 1504                             sizeof(linux_tv));
 1505                         if (error)
 1506                                 return (error);
 1507                         tv.tv_sec = linux_tv.tv_sec;
 1508                         tv.tv_usec = linux_tv.tv_usec;
 1509                         return (kern_setsockopt(td, args->s, bsd_args.level,
 1510                             name, &tv, UIO_SYSSPACE, sizeof(tv)));
 1511                         /* NOTREACHED */
 1512                         break;
 1513                 default:
 1514                         break;
 1515                 }
 1516                 break;
 1517         case IPPROTO_IP:
 1518                 name = linux_to_bsd_ip_sockopt(args->optname);
 1519                 break;
 1520         case IPPROTO_TCP:
 1521                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1522                 break;
 1523         default:
 1524                 name = -1;
 1525                 break;
 1526         }
 1527         if (name == -1)
 1528                 return (ENOPROTOOPT);
 1529 
 1530         bsd_args.name = name;
 1531         bsd_args.val = PTRIN(args->optval);
 1532         bsd_args.valsize = args->optlen;
 1533 
 1534         if (name == IPV6_NEXTHOP) {
 1535                 linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
 1536                         bsd_args.valsize);
 1537                 error = sys_setsockopt(td, &bsd_args);
 1538                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1539         } else
 1540                 error = sys_setsockopt(td, &bsd_args);
 1541 
 1542         return (error);
 1543 }
 1544 
 1545 struct linux_getsockopt_args {
 1546         int s;
 1547         int level;
 1548         int optname;
 1549         l_uintptr_t optval;
 1550         l_uintptr_t optlen;
 1551 };
 1552 
 1553 static int
 1554 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1555 {
 1556         struct getsockopt_args /* {
 1557                 int s;
 1558                 int level;
 1559                 int name;
 1560                 caddr_t val;
 1561                 int *avalsize;
 1562         } */ bsd_args;
 1563         l_timeval linux_tv;
 1564         struct timeval tv;
 1565         socklen_t tv_len, xulen;
 1566         struct xucred xu;
 1567         struct l_ucred lxu;
 1568         int error, name;
 1569 
 1570         bsd_args.s = args->s;
 1571         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1572         switch (bsd_args.level) {
 1573         case SOL_SOCKET:
 1574                 name = linux_to_bsd_so_sockopt(args->optname);
 1575                 switch (name) {
 1576                 case SO_RCVTIMEO:
 1577                         /* FALLTHROUGH */
 1578                 case SO_SNDTIMEO:
 1579                         tv_len = sizeof(tv);
 1580                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1581                             name, &tv, UIO_SYSSPACE, &tv_len);
 1582                         if (error)
 1583                                 return (error);
 1584                         linux_tv.tv_sec = tv.tv_sec;
 1585                         linux_tv.tv_usec = tv.tv_usec;
 1586                         return (copyout(&linux_tv, PTRIN(args->optval),
 1587                             sizeof(linux_tv)));
 1588                         /* NOTREACHED */
 1589                         break;
 1590                 case LOCAL_PEERCRED:
 1591                         if (args->optlen != sizeof(lxu))
 1592                                 return (EINVAL);
 1593                         xulen = sizeof(xu);
 1594                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1595                             name, &xu, UIO_SYSSPACE, &xulen);
 1596                         if (error)
 1597                                 return (error);
 1598                         /*
 1599                          * XXX Use 0 for pid as the FreeBSD does not cache peer pid.
 1600                          */
 1601                         lxu.pid = 0;
 1602                         lxu.uid = xu.cr_uid;
 1603                         lxu.gid = xu.cr_gid;
 1604                         return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
 1605                         /* NOTREACHED */
 1606                         break;
 1607                 default:
 1608                         break;
 1609                 }
 1610                 break;
 1611         case IPPROTO_IP:
 1612                 name = linux_to_bsd_ip_sockopt(args->optname);
 1613                 break;
 1614         case IPPROTO_TCP:
 1615                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1616                 break;
 1617         default:
 1618                 name = -1;
 1619                 break;
 1620         }
 1621         if (name == -1)
 1622                 return (EINVAL);
 1623 
 1624         bsd_args.name = name;
 1625         bsd_args.val = PTRIN(args->optval);
 1626         bsd_args.avalsize = PTRIN(args->optlen);
 1627 
 1628         if (name == IPV6_NEXTHOP) {
 1629                 error = sys_getsockopt(td, &bsd_args);
 1630                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1631         } else
 1632                 error = sys_getsockopt(td, &bsd_args);
 1633 
 1634         return (error);
 1635 }
 1636 
 1637 /* Argument list sizes for linux_socketcall */
 1638 
 1639 #define LINUX_AL(x) ((x) * sizeof(l_ulong))
 1640 
 1641 static const unsigned char lxs_args[] = {
 1642         LINUX_AL(0) /* unused*/,        LINUX_AL(3) /* socket */,
 1643         LINUX_AL(3) /* bind */,         LINUX_AL(3) /* connect */,
 1644         LINUX_AL(2) /* listen */,       LINUX_AL(3) /* accept */,
 1645         LINUX_AL(3) /* getsockname */,  LINUX_AL(3) /* getpeername */,
 1646         LINUX_AL(4) /* socketpair */,   LINUX_AL(4) /* send */,
 1647         LINUX_AL(4) /* recv */,         LINUX_AL(6) /* sendto */,
 1648         LINUX_AL(6) /* recvfrom */,     LINUX_AL(2) /* shutdown */,
 1649         LINUX_AL(5) /* setsockopt */,   LINUX_AL(5) /* getsockopt */,
 1650         LINUX_AL(3) /* sendmsg */,      LINUX_AL(3) /* recvmsg */,
 1651         LINUX_AL(4) /* accept4 */
 1652 };
 1653 
 1654 #define LINUX_AL_SIZE   sizeof(lxs_args) / sizeof(lxs_args[0]) - 1
 1655 
 1656 int
 1657 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1658 {
 1659         l_ulong a[6];
 1660         void *arg;
 1661         int error;
 1662 
 1663         if (args->what < LINUX_SOCKET || args->what > LINUX_AL_SIZE)
 1664                 return (EINVAL);
 1665         error = copyin(PTRIN(args->args), a, lxs_args[args->what]);
 1666         if (error)
 1667                 return (error);
 1668 
 1669         arg = a;
 1670         switch (args->what) {
 1671         case LINUX_SOCKET:
 1672                 return (linux_socket(td, arg));
 1673         case LINUX_BIND:
 1674                 return (linux_bind(td, arg));
 1675         case LINUX_CONNECT:
 1676                 return (linux_connect(td, arg));
 1677         case LINUX_LISTEN:
 1678                 return (linux_listen(td, arg));
 1679         case LINUX_ACCEPT:
 1680                 return (linux_accept(td, arg));
 1681         case LINUX_GETSOCKNAME:
 1682                 return (linux_getsockname(td, arg));
 1683         case LINUX_GETPEERNAME:
 1684                 return (linux_getpeername(td, arg));
 1685         case LINUX_SOCKETPAIR:
 1686                 return (linux_socketpair(td, arg));
 1687         case LINUX_SEND:
 1688                 return (linux_send(td, arg));
 1689         case LINUX_RECV:
 1690                 return (linux_recv(td, arg));
 1691         case LINUX_SENDTO:
 1692                 return (linux_sendto(td, arg));
 1693         case LINUX_RECVFROM:
 1694                 return (linux_recvfrom(td, arg));
 1695         case LINUX_SHUTDOWN:
 1696                 return (linux_shutdown(td, arg));
 1697         case LINUX_SETSOCKOPT:
 1698                 return (linux_setsockopt(td, arg));
 1699         case LINUX_GETSOCKOPT:
 1700                 return (linux_getsockopt(td, arg));
 1701         case LINUX_SENDMSG:
 1702                 return (linux_sendmsg(td, arg));
 1703         case LINUX_RECVMSG:
 1704                 return (linux_recvmsg(td, arg));
 1705         case LINUX_ACCEPT4:
 1706                 return (linux_accept4(td, arg));
 1707         }
 1708 
 1709         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1710         return (ENOSYS);
 1711 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_socket.c

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