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("$FreeBSD$");
   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 #include <netinet/tcp.h>
   59 #ifdef INET6
   60 #include <netinet/ip6.h>
   61 #include <netinet6/ip6_var.h>
   62 #include <netinet6/in6_var.h>
   63 #endif
   64 
   65 #ifdef COMPAT_LINUX32
   66 #include <machine/../linux32/linux.h>
   67 #include <machine/../linux32/linux32_proto.h>
   68 #else
   69 #include <machine/../linux/linux.h>
   70 #include <machine/../linux/linux_proto.h>
   71 #endif
   72 #include <compat/linux/linux_socket.h>
   73 #include <compat/linux/linux_util.h>
   74 
   75 static int do_sa_get(struct sockaddr **, const struct osockaddr *, int *,
   76     struct malloc_type *);
   77 static int linux_to_bsd_domain(int);
   78 
   79 /*
   80  * Reads a linux sockaddr and does any necessary translation.
   81  * Linux sockaddrs don't have a length field, only a family.
   82  */
   83 static int
   84 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int len)
   85 {
   86         int osalen = len;
   87 
   88         return (do_sa_get(sap, osa, &osalen, M_SONAME));
   89 }
   90 
   91 /*
   92  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   93  * family and convert to sockaddr.
   94  */
   95 static int
   96 do_sa_get(struct sockaddr **sap, const struct osockaddr *osa, int *osalen,
   97     struct malloc_type *mtype)
   98 {
   99         int error=0, bdom;
  100         struct sockaddr *sa;
  101         struct osockaddr *kosa;
  102         int alloclen;
  103 #ifdef INET6
  104         int oldv6size;
  105         struct sockaddr_in6 *sin6;
  106 #endif
  107         int namelen;
  108 
  109         if (*osalen < 2 || *osalen > UCHAR_MAX || !osa)
  110                 return (EINVAL);
  111 
  112         alloclen = *osalen;
  113 #ifdef INET6
  114         oldv6size = 0;
  115         /*
  116          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  117          * if it's a v4-mapped address, so reserve the proper space
  118          * for it.
  119          */
  120         if (alloclen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) {
  121                 alloclen = sizeof (struct sockaddr_in6);
  122                 oldv6size = 1;
  123         }
  124 #endif
  125 
  126         kosa = malloc(alloclen, mtype, M_WAITOK);
  127 
  128         if ((error = copyin(osa, kosa, *osalen)))
  129                 goto out;
  130 
  131         bdom = linux_to_bsd_domain(kosa->sa_family);
  132         if (bdom == -1) {
  133                 error = EAFNOSUPPORT;
  134                 goto out;
  135         }
  136 
  137 #ifdef INET6
  138         /*
  139          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  140          * which lacks the scope id compared with RFC2553 one. If we detect
  141          * the situation, reject the address and write a message to system log.
  142          *
  143          * Still accept addresses for which the scope id is not used.
  144          */
  145         if (oldv6size && bdom == AF_INET6) {
  146                 sin6 = (struct sockaddr_in6 *)kosa;
  147                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  148                     (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  149                      !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  150                      !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  151                      !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  152                      !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  153                         sin6->sin6_scope_id = 0;
  154                 } else {
  155                         log(LOG_DEBUG,
  156                             "obsolete pre-RFC2553 sockaddr_in6 rejected\n");
  157                         error = EINVAL;
  158                         goto out;
  159                 }
  160         } else
  161 #endif
  162         if (bdom == AF_INET) {
  163                 alloclen = sizeof(struct sockaddr_in);
  164                 if (*osalen < alloclen) {
  165                         error = EINVAL;
  166                         goto out;
  167                 }
  168         }
  169 
  170         if ((bdom == AF_LOCAL) && (*osalen > sizeof(struct sockaddr_un))) {
  171                 for (namelen = 0;
  172                     namelen < *osalen - offsetof(struct sockaddr_un, sun_path);
  173                     namelen++)
  174                         if (!((struct sockaddr_un *)kosa)->sun_path[namelen])
  175                                 break;
  176                 if (namelen + offsetof(struct sockaddr_un, sun_path) >
  177                     sizeof(struct sockaddr_un)) {
  178                         error = EINVAL;
  179                         goto out;
  180                 }
  181                 alloclen = sizeof(struct sockaddr_un);
  182         }
  183 
  184         sa = (struct sockaddr *) kosa;
  185         sa->sa_family = bdom;
  186         sa->sa_len = alloclen;
  187 
  188         *sap = sa;
  189         *osalen = alloclen;
  190         return (0);
  191 
  192 out:
  193         free(kosa, mtype);
  194         return (error);
  195 }
  196 
  197 static int
  198 linux_to_bsd_domain(int domain)
  199 {
  200 
  201         switch (domain) {
  202         case LINUX_AF_UNSPEC:
  203                 return (AF_UNSPEC);
  204         case LINUX_AF_UNIX:
  205                 return (AF_LOCAL);
  206         case LINUX_AF_INET:
  207                 return (AF_INET);
  208         case LINUX_AF_INET6:
  209                 return (AF_INET6);
  210         case LINUX_AF_AX25:
  211                 return (AF_CCITT);
  212         case LINUX_AF_IPX:
  213                 return (AF_IPX);
  214         case LINUX_AF_APPLETALK:
  215                 return (AF_APPLETALK);
  216         }
  217         return (-1);
  218 }
  219 
  220 static int
  221 bsd_to_linux_domain(int domain)
  222 {
  223 
  224         switch (domain) {
  225         case AF_UNSPEC:
  226                 return (LINUX_AF_UNSPEC);
  227         case AF_LOCAL:
  228                 return (LINUX_AF_UNIX);
  229         case AF_INET:
  230                 return (LINUX_AF_INET);
  231         case AF_INET6:
  232                 return (LINUX_AF_INET6);
  233         case AF_CCITT:
  234                 return (LINUX_AF_AX25);
  235         case AF_IPX:
  236                 return (LINUX_AF_IPX);
  237         case AF_APPLETALK:
  238                 return (LINUX_AF_APPLETALK);
  239         }
  240         return (-1);
  241 }
  242 
  243 static int
  244 linux_to_bsd_sockopt_level(int level)
  245 {
  246 
  247         switch (level) {
  248         case LINUX_SOL_SOCKET:
  249                 return (SOL_SOCKET);
  250         }
  251         return (level);
  252 }
  253 
  254 static int
  255 bsd_to_linux_sockopt_level(int level)
  256 {
  257 
  258         switch (level) {
  259         case SOL_SOCKET:
  260                 return (LINUX_SOL_SOCKET);
  261         }
  262         return (level);
  263 }
  264 
  265 static int
  266 linux_to_bsd_ip_sockopt(int opt)
  267 {
  268 
  269         switch (opt) {
  270         case LINUX_IP_TOS:
  271                 return (IP_TOS);
  272         case LINUX_IP_TTL:
  273                 return (IP_TTL);
  274         case LINUX_IP_OPTIONS:
  275                 return (IP_OPTIONS);
  276         case LINUX_IP_MULTICAST_IF:
  277                 return (IP_MULTICAST_IF);
  278         case LINUX_IP_MULTICAST_TTL:
  279                 return (IP_MULTICAST_TTL);
  280         case LINUX_IP_MULTICAST_LOOP:
  281                 return (IP_MULTICAST_LOOP);
  282         case LINUX_IP_ADD_MEMBERSHIP:
  283                 return (IP_ADD_MEMBERSHIP);
  284         case LINUX_IP_DROP_MEMBERSHIP:
  285                 return (IP_DROP_MEMBERSHIP);
  286         case LINUX_IP_HDRINCL:
  287                 return (IP_HDRINCL);
  288         }
  289         return (-1);
  290 }
  291 
  292 static int
  293 linux_to_bsd_so_sockopt(int opt)
  294 {
  295 
  296         switch (opt) {
  297         case LINUX_SO_DEBUG:
  298                 return (SO_DEBUG);
  299         case LINUX_SO_REUSEADDR:
  300                 return (SO_REUSEADDR);
  301         case LINUX_SO_TYPE:
  302                 return (SO_TYPE);
  303         case LINUX_SO_ERROR:
  304                 return (SO_ERROR);
  305         case LINUX_SO_DONTROUTE:
  306                 return (SO_DONTROUTE);
  307         case LINUX_SO_BROADCAST:
  308                 return (SO_BROADCAST);
  309         case LINUX_SO_SNDBUF:
  310                 return (SO_SNDBUF);
  311         case LINUX_SO_RCVBUF:
  312                 return (SO_RCVBUF);
  313         case LINUX_SO_KEEPALIVE:
  314                 return (SO_KEEPALIVE);
  315         case LINUX_SO_OOBINLINE:
  316                 return (SO_OOBINLINE);
  317         case LINUX_SO_LINGER:
  318                 return (SO_LINGER);
  319         case LINUX_SO_PEERCRED:
  320                 return (LOCAL_PEERCRED);
  321         case LINUX_SO_RCVLOWAT:
  322                 return (SO_RCVLOWAT);
  323         case LINUX_SO_SNDLOWAT:
  324                 return (SO_SNDLOWAT);
  325         case LINUX_SO_RCVTIMEO:
  326                 return (SO_RCVTIMEO);
  327         case LINUX_SO_SNDTIMEO:
  328                 return (SO_SNDTIMEO);
  329         case LINUX_SO_TIMESTAMP:
  330                 return (SO_TIMESTAMP);
  331         case LINUX_SO_ACCEPTCONN:
  332                 return (SO_ACCEPTCONN);
  333         }
  334         return (-1);
  335 }
  336 
  337 static int
  338 linux_to_bsd_tcp_sockopt(int opt)
  339 {
  340 
  341         switch (opt) {
  342         case LINUX_TCP_NODELAY:
  343                 return (TCP_NODELAY);
  344         case LINUX_TCP_MAXSEG:
  345                 return (TCP_MAXSEG);
  346         case LINUX_TCP_MD5SIG:
  347                 return (TCP_MD5SIG);
  348         }
  349         return (-1);
  350 }
  351 
  352 static int
  353 linux_to_bsd_msg_flags(int flags)
  354 {
  355         int ret_flags = 0;
  356 
  357         if (flags & LINUX_MSG_OOB)
  358                 ret_flags |= MSG_OOB;
  359         if (flags & LINUX_MSG_PEEK)
  360                 ret_flags |= MSG_PEEK;
  361         if (flags & LINUX_MSG_DONTROUTE)
  362                 ret_flags |= MSG_DONTROUTE;
  363         if (flags & LINUX_MSG_CTRUNC)
  364                 ret_flags |= MSG_CTRUNC;
  365         if (flags & LINUX_MSG_TRUNC)
  366                 ret_flags |= MSG_TRUNC;
  367         if (flags & LINUX_MSG_DONTWAIT)
  368                 ret_flags |= MSG_DONTWAIT;
  369         if (flags & LINUX_MSG_EOR)
  370                 ret_flags |= MSG_EOR;
  371         if (flags & LINUX_MSG_WAITALL)
  372                 ret_flags |= MSG_WAITALL;
  373         if (flags & LINUX_MSG_NOSIGNAL)
  374                 ret_flags |= MSG_NOSIGNAL;
  375 #if 0 /* not handled */
  376         if (flags & LINUX_MSG_PROXY)
  377                 ;
  378         if (flags & LINUX_MSG_FIN)
  379                 ;
  380         if (flags & LINUX_MSG_SYN)
  381                 ;
  382         if (flags & LINUX_MSG_CONFIRM)
  383                 ;
  384         if (flags & LINUX_MSG_RST)
  385                 ;
  386         if (flags & LINUX_MSG_ERRQUEUE)
  387                 ;
  388 #endif
  389         return ret_flags;
  390 }
  391 
  392 /*
  393 * If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
  394 * native syscall will fault.  Thus, we don't really need to check the
  395 * return values for these functions.
  396 */
  397 
  398 static int
  399 bsd_to_linux_sockaddr(struct sockaddr *arg)
  400 {
  401         struct sockaddr sa;
  402         size_t sa_len = sizeof(struct sockaddr);
  403         int error;
  404         
  405         if ((error = copyin(arg, &sa, sa_len)))
  406                 return (error);
  407         
  408         *(u_short *)&sa = sa.sa_family;
  409         
  410         error = copyout(&sa, arg, sa_len);
  411         
  412         return (error);
  413 }
  414 
  415 static int
  416 linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
  417 {
  418         struct sockaddr sa;
  419         size_t sa_len = sizeof(struct sockaddr);
  420         int error;
  421 
  422         if ((error = copyin(arg, &sa, sa_len)))
  423                 return (error);
  424 
  425         sa.sa_family = *(sa_family_t *)&sa;
  426         sa.sa_len = len;
  427 
  428         error = copyout(&sa, arg, sa_len);
  429 
  430         return (error);
  431 }
  432 
  433 
  434 static int
  435 linux_sa_put(struct osockaddr *osa)
  436 {
  437         struct osockaddr sa;
  438         int error, bdom;
  439 
  440         /*
  441          * Only read/write the osockaddr family part, the rest is
  442          * not changed.
  443          */
  444         error = copyin(osa, &sa, sizeof(sa.sa_family));
  445         if (error)
  446                 return (error);
  447 
  448         bdom = bsd_to_linux_domain(sa.sa_family);
  449         if (bdom == -1)
  450                 return (EINVAL);
  451 
  452         sa.sa_family = bdom;
  453         error = copyout(&sa, osa, sizeof(sa.sa_family));
  454         if (error)
  455                 return (error);
  456 
  457         return (0);
  458 }
  459 
  460 static int
  461 linux_to_bsd_cmsg_type(int cmsg_type)
  462 {
  463 
  464         switch (cmsg_type) {
  465         case LINUX_SCM_RIGHTS:
  466                 return (SCM_RIGHTS);
  467         case LINUX_SCM_CREDENTIALS:
  468                 return (SCM_CREDS);
  469         }
  470         return (-1);
  471 }
  472 
  473 static int
  474 bsd_to_linux_cmsg_type(int cmsg_type)
  475 {
  476 
  477         switch (cmsg_type) {
  478         case SCM_RIGHTS:
  479                 return (LINUX_SCM_RIGHTS);
  480         case SCM_CREDS:
  481                 return (LINUX_SCM_CREDENTIALS);
  482         }
  483         return (-1);
  484 }
  485 
  486 static int
  487 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
  488 {
  489         if (lhdr->msg_controllen > INT_MAX)
  490                 return (ENOBUFS);
  491 
  492         bhdr->msg_name          = PTRIN(lhdr->msg_name);
  493         bhdr->msg_namelen       = lhdr->msg_namelen;
  494         bhdr->msg_iov           = PTRIN(lhdr->msg_iov);
  495         bhdr->msg_iovlen        = lhdr->msg_iovlen;
  496         bhdr->msg_control       = PTRIN(lhdr->msg_control);
  497 
  498         /*
  499          * msg_controllen is skipped since BSD and LINUX control messages
  500          * are potentially different sizes (e.g. the cred structure used
  501          * by SCM_CREDS is different between the two operating system).
  502          *
  503          * The caller can set it (if necessary) after converting all the
  504          * control messages.
  505          */
  506 
  507         bhdr->msg_flags         = linux_to_bsd_msg_flags(lhdr->msg_flags);
  508         return (0);
  509 }
  510 
  511 static int
  512 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
  513 {
  514         lhdr->msg_name          = PTROUT(bhdr->msg_name);
  515         lhdr->msg_namelen       = bhdr->msg_namelen;
  516         lhdr->msg_iov           = PTROUT(bhdr->msg_iov);
  517         lhdr->msg_iovlen        = bhdr->msg_iovlen;
  518         lhdr->msg_control       = PTROUT(bhdr->msg_control);
  519 
  520         /*
  521          * msg_controllen is skipped since BSD and LINUX control messages
  522          * are potentially different sizes (e.g. the cred structure used
  523          * by SCM_CREDS is different between the two operating system).
  524          *
  525          * The caller can set it (if necessary) after converting all the
  526          * control messages.
  527          */
  528 
  529         /* msg_flags skipped */
  530         return (0);
  531 }
  532 
  533 static int
  534 linux_set_socket_flags(struct thread *td, int s, int flags)
  535 {
  536         int error;
  537 
  538         if (flags & LINUX_SOCK_NONBLOCK) {
  539                 error = kern_fcntl(td, s, F_SETFL, O_NONBLOCK);
  540                 if (error)
  541                         return (error);
  542         }
  543         if (flags & LINUX_SOCK_CLOEXEC) {
  544                 error = kern_fcntl(td, s, F_SETFD, FD_CLOEXEC);
  545                 if (error)
  546                         return (error);
  547         }
  548         return (0);
  549 }
  550 
  551 static int
  552 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  553     struct mbuf *control, enum uio_seg segflg)
  554 {
  555         struct sockaddr *to;
  556         int error;
  557 
  558         if (mp->msg_name != NULL) {
  559                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  560                 if (error)
  561                         return (error);
  562                 mp->msg_name = to;
  563         } else
  564                 to = NULL;
  565 
  566         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  567             segflg);
  568 
  569         if (to)
  570                 free(to, M_SONAME);
  571         return (error);
  572 }
  573 
  574 /* Return 0 if IP_HDRINCL is set for the given socket. */
  575 static int
  576 linux_check_hdrincl(struct thread *td, int s)
  577 {
  578         int error, optval, size_val;
  579 
  580         size_val = sizeof(optval);
  581         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  582             &optval, UIO_SYSSPACE, &size_val);
  583         if (error)
  584                 return (error);
  585 
  586         return (optval == 0);
  587 }
  588 
  589 struct linux_sendto_args {
  590         int s;
  591         l_uintptr_t msg;
  592         int len;
  593         int flags;
  594         l_uintptr_t to;
  595         int tolen;
  596 };
  597 
  598 /*
  599  * Updated sendto() when IP_HDRINCL is set:
  600  * tweak endian-dependent fields in the IP packet.
  601  */
  602 static int
  603 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  604 {
  605 /*
  606  * linux_ip_copysize defines how many bytes we should copy
  607  * from the beginning of the IP packet before we customize it for BSD.
  608  * It should include all the fields we modify (ip_len and ip_off).
  609  */
  610 #define linux_ip_copysize       8
  611 
  612         struct ip *packet;
  613         struct msghdr msg;
  614         struct iovec aiov[1];
  615         int error;
  616 
  617         /* Check that the packet isn't too big or too small. */
  618         if (linux_args->len < linux_ip_copysize ||
  619             linux_args->len > IP_MAXPACKET)
  620                 return (EINVAL);
  621 
  622         packet = (struct ip *)malloc(linux_args->len, M_TEMP, M_WAITOK);
  623 
  624         /* Make kernel copy of the packet to be sent */
  625         if ((error = copyin(PTRIN(linux_args->msg), packet,
  626             linux_args->len)))
  627                 goto goout;
  628 
  629         /* Convert fields from Linux to BSD raw IP socket format */
  630         packet->ip_len = linux_args->len;
  631         packet->ip_off = ntohs(packet->ip_off);
  632 
  633         /* Prepare the msghdr and iovec structures describing the new packet */
  634         msg.msg_name = PTRIN(linux_args->to);
  635         msg.msg_namelen = linux_args->tolen;
  636         msg.msg_iov = aiov;
  637         msg.msg_iovlen = 1;
  638         msg.msg_control = NULL;
  639         msg.msg_flags = 0;
  640         aiov[0].iov_base = (char *)packet;
  641         aiov[0].iov_len = linux_args->len;
  642         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  643             NULL, UIO_SYSSPACE);
  644 goout:
  645         free(packet, M_TEMP);
  646         return (error);
  647 }
  648 
  649 struct linux_socket_args {
  650         int domain;
  651         int type;
  652         int protocol;
  653 };
  654 
  655 static int
  656 linux_socket(struct thread *td, struct linux_socket_args *args)
  657 {
  658         struct socket_args /* {
  659                 int domain;
  660                 int type;
  661                 int protocol;
  662         } */ bsd_args;
  663         int retval_socket, socket_flags;
  664 
  665         bsd_args.protocol = args->protocol;
  666         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  667         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  668                 return (EINVAL);
  669         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  670         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  671                 return (EINVAL);
  672         bsd_args.domain = linux_to_bsd_domain(args->domain);
  673         if (bsd_args.domain == -1)
  674                 return (EAFNOSUPPORT);
  675 
  676         retval_socket = socket(td, &bsd_args);
  677         if (retval_socket)
  678                 return (retval_socket);
  679 
  680         retval_socket = linux_set_socket_flags(td, td->td_retval[0],
  681             socket_flags);
  682         if (retval_socket) {
  683                 (void)kern_close(td, td->td_retval[0]);
  684                 goto out;
  685         }
  686 
  687         if (bsd_args.type == SOCK_RAW
  688             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  689             && bsd_args.domain == PF_INET) {
  690                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  691                 int hdrincl;
  692 
  693                 hdrincl = 1;
  694                 /* We ignore any error returned by kern_setsockopt() */
  695                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  696                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  697         }
  698 #ifdef INET6
  699         /*
  700          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
  701          * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
  702          * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
  703          * sysctl value.
  704          */
  705         if (bsd_args.domain == PF_INET6) {
  706                 int v6only;
  707 
  708                 v6only = 0;
  709                 /* We ignore any error returned by setsockopt() */
  710                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  711                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  712         }
  713 #endif
  714 
  715 out:
  716         return (retval_socket);
  717 }
  718 
  719 struct linux_bind_args {
  720         int s;
  721         l_uintptr_t name;
  722         int namelen;
  723 };
  724 
  725 static int
  726 linux_bind(struct thread *td, struct linux_bind_args *args)
  727 {
  728         struct sockaddr *sa;
  729         int error;
  730 
  731         error = linux_getsockaddr(&sa, PTRIN(args->name),
  732             args->namelen);
  733         if (error)
  734                 return (error);
  735 
  736         error = kern_bind(td, args->s, sa);
  737         free(sa, M_SONAME);
  738         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  739                 return (EINVAL);
  740         return (error);
  741 }
  742 
  743 struct linux_connect_args {
  744         int s;
  745         l_uintptr_t name;
  746         int namelen;
  747 };
  748 int linux_connect(struct thread *, struct linux_connect_args *);
  749 
  750 int
  751 linux_connect(struct thread *td, struct linux_connect_args *args)
  752 {
  753         struct socket *so;
  754         struct sockaddr *sa;
  755         u_int fflag;
  756         int error;
  757 
  758         error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
  759             args->namelen);
  760         if (error)
  761                 return (error);
  762 
  763         error = kern_connect(td, args->s, sa);
  764         free(sa, M_SONAME);
  765         if (error != EISCONN)
  766                 return (error);
  767 
  768         /*
  769          * Linux doesn't return EISCONN the first time it occurs,
  770          * when on a non-blocking socket. Instead it returns the
  771          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  772          *
  773          * XXXRW: Instead of using fgetsock(), check that it is a
  774          * socket and use the file descriptor reference instead of
  775          * creating a new one.
  776          */
  777         error = fgetsock(td, args->s, &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 (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 = 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 = 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 = 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 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 (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 = 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_WAIT, 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         if (control != NULL)
 1449                 m_freem(control);
 1450         if (linux_cmsg != NULL)
 1451                 free(linux_cmsg, M_TEMP);
 1452 
 1453         return (error);
 1454 }
 1455 
 1456 struct linux_shutdown_args {
 1457         int s;
 1458         int how;
 1459 };
 1460 
 1461 static int
 1462 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1463 {
 1464         struct shutdown_args /* {
 1465                 int s;
 1466                 int how;
 1467         } */ bsd_args;
 1468 
 1469         bsd_args.s = args->s;
 1470         bsd_args.how = args->how;
 1471         return (shutdown(td, &bsd_args));
 1472 }
 1473 
 1474 struct linux_setsockopt_args {
 1475         int s;
 1476         int level;
 1477         int optname;
 1478         l_uintptr_t optval;
 1479         int optlen;
 1480 };
 1481 
 1482 static int
 1483 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1484 {
 1485         struct setsockopt_args /* {
 1486                 int s;
 1487                 int level;
 1488                 int name;
 1489                 caddr_t val;
 1490                 int valsize;
 1491         } */ bsd_args;
 1492         l_timeval linux_tv;
 1493         struct timeval tv;
 1494         int error, name;
 1495 
 1496         bsd_args.s = args->s;
 1497         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1498         switch (bsd_args.level) {
 1499         case SOL_SOCKET:
 1500                 name = linux_to_bsd_so_sockopt(args->optname);
 1501                 switch (name) {
 1502                 case SO_RCVTIMEO:
 1503                         /* FALLTHROUGH */
 1504                 case SO_SNDTIMEO:
 1505                         error = copyin(PTRIN(args->optval), &linux_tv,
 1506                             sizeof(linux_tv));
 1507                         if (error)
 1508                                 return (error);
 1509                         tv.tv_sec = linux_tv.tv_sec;
 1510                         tv.tv_usec = linux_tv.tv_usec;
 1511                         return (kern_setsockopt(td, args->s, bsd_args.level,
 1512                             name, &tv, UIO_SYSSPACE, sizeof(tv)));
 1513                         /* NOTREACHED */
 1514                         break;
 1515                 default:
 1516                         break;
 1517                 }
 1518                 break;
 1519         case IPPROTO_IP:
 1520                 name = linux_to_bsd_ip_sockopt(args->optname);
 1521                 break;
 1522         case IPPROTO_TCP:
 1523                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1524                 break;
 1525         default:
 1526                 name = -1;
 1527                 break;
 1528         }
 1529         if (name == -1)
 1530                 return (ENOPROTOOPT);
 1531 
 1532         bsd_args.name = name;
 1533         bsd_args.val = PTRIN(args->optval);
 1534         bsd_args.valsize = args->optlen;
 1535 
 1536         if (name == IPV6_NEXTHOP) {
 1537                 linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
 1538                         bsd_args.valsize);
 1539                 error = setsockopt(td, &bsd_args);
 1540                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1541         } else
 1542                 error = setsockopt(td, &bsd_args);
 1543 
 1544         return (error);
 1545 }
 1546 
 1547 struct linux_getsockopt_args {
 1548         int s;
 1549         int level;
 1550         int optname;
 1551         l_uintptr_t optval;
 1552         l_uintptr_t optlen;
 1553 };
 1554 
 1555 static int
 1556 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1557 {
 1558         struct getsockopt_args /* {
 1559                 int s;
 1560                 int level;
 1561                 int name;
 1562                 caddr_t val;
 1563                 int *avalsize;
 1564         } */ bsd_args;
 1565         l_timeval linux_tv;
 1566         struct timeval tv;
 1567         socklen_t tv_len, xulen;
 1568         struct xucred xu;
 1569         struct l_ucred lxu;
 1570         int error, name;
 1571 
 1572         bsd_args.s = args->s;
 1573         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1574         switch (bsd_args.level) {
 1575         case SOL_SOCKET:
 1576                 name = linux_to_bsd_so_sockopt(args->optname);
 1577                 switch (name) {
 1578                 case SO_RCVTIMEO:
 1579                         /* FALLTHROUGH */
 1580                 case SO_SNDTIMEO:
 1581                         tv_len = sizeof(tv);
 1582                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1583                             name, &tv, UIO_SYSSPACE, &tv_len);
 1584                         if (error)
 1585                                 return (error);
 1586                         linux_tv.tv_sec = tv.tv_sec;
 1587                         linux_tv.tv_usec = tv.tv_usec;
 1588                         return (copyout(&linux_tv, PTRIN(args->optval),
 1589                             sizeof(linux_tv)));
 1590                         /* NOTREACHED */
 1591                         break;
 1592                 case LOCAL_PEERCRED:
 1593                         if (args->optlen != sizeof(lxu))
 1594                                 return (EINVAL);
 1595                         xulen = sizeof(xu);
 1596                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1597                             name, &xu, UIO_SYSSPACE, &xulen);
 1598                         if (error)
 1599                                 return (error);
 1600                         /*
 1601                          * XXX Use 0 for pid as the FreeBSD does not cache peer pid.
 1602                          */
 1603                         lxu.pid = 0;
 1604                         lxu.uid = xu.cr_uid;
 1605                         lxu.gid = xu.cr_gid;
 1606                         return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
 1607                         /* NOTREACHED */
 1608                         break;
 1609                 default:
 1610                         break;
 1611                 }
 1612                 break;
 1613         case IPPROTO_IP:
 1614                 name = linux_to_bsd_ip_sockopt(args->optname);
 1615                 break;
 1616         case IPPROTO_TCP:
 1617                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1618                 break;
 1619         default:
 1620                 name = -1;
 1621                 break;
 1622         }
 1623         if (name == -1)
 1624                 return (EINVAL);
 1625 
 1626         bsd_args.name = name;
 1627         bsd_args.val = PTRIN(args->optval);
 1628         bsd_args.avalsize = PTRIN(args->optlen);
 1629 
 1630         if (name == IPV6_NEXTHOP) {
 1631                 error = getsockopt(td, &bsd_args);
 1632                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1633         } else
 1634                 error = getsockopt(td, &bsd_args);
 1635 
 1636         return (error);
 1637 }
 1638 
 1639 /* Argument list sizes for linux_socketcall */
 1640 
 1641 #define LINUX_AL(x) ((x) * sizeof(l_ulong))
 1642 
 1643 static const unsigned char lxs_args[] = {
 1644         LINUX_AL(0) /* unused*/,        LINUX_AL(3) /* socket */,
 1645         LINUX_AL(3) /* bind */,         LINUX_AL(3) /* connect */,
 1646         LINUX_AL(2) /* listen */,       LINUX_AL(3) /* accept */,
 1647         LINUX_AL(3) /* getsockname */,  LINUX_AL(3) /* getpeername */,
 1648         LINUX_AL(4) /* socketpair */,   LINUX_AL(4) /* send */,
 1649         LINUX_AL(4) /* recv */,         LINUX_AL(6) /* sendto */,
 1650         LINUX_AL(6) /* recvfrom */,     LINUX_AL(2) /* shutdown */,
 1651         LINUX_AL(5) /* setsockopt */,   LINUX_AL(5) /* getsockopt */,
 1652         LINUX_AL(3) /* sendmsg */,      LINUX_AL(3) /* recvmsg */,
 1653         LINUX_AL(4) /* accept4 */
 1654 };
 1655 
 1656 #define LINUX_AL_SIZE   sizeof(lxs_args) / sizeof(lxs_args[0]) - 1
 1657 
 1658 int
 1659 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1660 {
 1661         l_ulong a[6];
 1662         void *arg;
 1663         int error;
 1664 
 1665         if (args->what < LINUX_SOCKET || args->what > LINUX_AL_SIZE)
 1666                 return (EINVAL);
 1667         error = copyin(PTRIN(args->args), a, lxs_args[args->what]);
 1668         if (error)
 1669                 return (error);
 1670 
 1671         arg = a;
 1672         switch (args->what) {
 1673         case LINUX_SOCKET:
 1674                 return (linux_socket(td, arg));
 1675         case LINUX_BIND:
 1676                 return (linux_bind(td, arg));
 1677         case LINUX_CONNECT:
 1678                 return (linux_connect(td, arg));
 1679         case LINUX_LISTEN:
 1680                 return (linux_listen(td, arg));
 1681         case LINUX_ACCEPT:
 1682                 return (linux_accept(td, arg));
 1683         case LINUX_GETSOCKNAME:
 1684                 return (linux_getsockname(td, arg));
 1685         case LINUX_GETPEERNAME:
 1686                 return (linux_getpeername(td, arg));
 1687         case LINUX_SOCKETPAIR:
 1688                 return (linux_socketpair(td, arg));
 1689         case LINUX_SEND:
 1690                 return (linux_send(td, arg));
 1691         case LINUX_RECV:
 1692                 return (linux_recv(td, arg));
 1693         case LINUX_SENDTO:
 1694                 return (linux_sendto(td, arg));
 1695         case LINUX_RECVFROM:
 1696                 return (linux_recvfrom(td, arg));
 1697         case LINUX_SHUTDOWN:
 1698                 return (linux_shutdown(td, arg));
 1699         case LINUX_SETSOCKOPT:
 1700                 return (linux_setsockopt(td, arg));
 1701         case LINUX_GETSOCKOPT:
 1702                 return (linux_getsockopt(td, arg));
 1703         case LINUX_SENDMSG:
 1704                 return (linux_sendmsg(td, arg));
 1705         case LINUX_RECVMSG:
 1706                 return (linux_recvmsg(td, arg));
 1707         case LINUX_ACCEPT4:
 1708                 return (linux_accept4(td, arg));
 1709         }
 1710 
 1711         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1712         return (ENOSYS);
 1713 }

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