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


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

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    1 /*-
    2  * Copyright (c) 1995 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/5.4/sys/compat/linux/linux_socket.c 142899 2005-03-01 10:08:11Z obrien $");
   31 
   32 /* XXX we use functions that might not exist. */
   33 #include "opt_compat.h"
   34 #include "opt_inet6.h"
   35 
   36 #ifndef COMPAT_43
   37 #error "Unable to compile Linux-emulator due to missing COMPAT_43 option!"
   38 #endif
   39 
   40 #include <sys/param.h>
   41 #include <sys/proc.h>
   42 #include <sys/systm.h>
   43 #include <sys/sysproto.h>
   44 #include <sys/fcntl.h>
   45 #include <sys/file.h>
   46 #include <sys/limits.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/socket.h>
   50 #include <sys/socketvar.h>
   51 #include <sys/syscallsubr.h>
   52 #include <sys/uio.h>
   53 #include <sys/syslog.h>
   54 
   55 #include <netinet/in.h>
   56 #include <netinet/in_systm.h>
   57 #include <netinet/ip.h>
   58 #ifdef INET6
   59 #include <netinet/ip6.h>
   60 #include <netinet6/ip6_var.h>
   61 #endif
   62 
   63 #include "opt_compat.h"
   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 
  108         if (*osalen < 2 || *osalen > UCHAR_MAX || !osa)
  109                 return (EINVAL);
  110 
  111         alloclen = *osalen;
  112 #ifdef INET6
  113         oldv6size = 0;
  114         /*
  115          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  116          * if it's a v4-mapped address, so reserve the proper space
  117          * for it.
  118          */
  119         if (alloclen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) {
  120                 alloclen = sizeof (struct sockaddr_in6);
  121                 oldv6size = 1;
  122         }
  123 #endif
  124 
  125         MALLOC(kosa, struct osockaddr *, alloclen, mtype, M_WAITOK);
  126 
  127         if ((error = copyin(osa, kosa, *osalen)))
  128                 goto out;
  129 
  130         bdom = linux_to_bsd_domain(kosa->sa_family);
  131         if (bdom == -1) {
  132                 error = EINVAL;
  133                 goto out;
  134         }
  135 
  136 #ifdef INET6
  137         /*
  138          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  139          * which lacks the scope id compared with RFC2553 one. If we detect
  140          * the situation, reject the address and write a message to system log.
  141          *
  142          * Still accept addresses for which the scope id is not used.
  143          */
  144         if (oldv6size && bdom == AF_INET6) {
  145                 sin6 = (struct sockaddr_in6 *)kosa;
  146                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  147                     (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  148                      !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  149                      !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  150                      !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  151                      !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  152                         sin6->sin6_scope_id = 0;
  153                 } else {
  154                         log(LOG_DEBUG,
  155                             "obsolete pre-RFC2553 sockaddr_in6 rejected");
  156                         error = EINVAL;
  157                         goto out;
  158                 }
  159         } else
  160 #endif
  161         if (bdom == AF_INET)
  162                 alloclen = sizeof(struct sockaddr_in);
  163 
  164         sa = (struct sockaddr *) kosa;
  165         sa->sa_family = bdom;
  166         sa->sa_len = alloclen;
  167 
  168         *sap = sa;
  169         *osalen = alloclen;
  170         return (0);
  171 
  172 out:
  173         FREE(kosa, mtype);
  174         return (error);
  175 }
  176 
  177 static int
  178 linux_to_bsd_domain(int domain)
  179 {
  180 
  181         switch (domain) {
  182         case LINUX_AF_UNSPEC:
  183                 return (AF_UNSPEC);
  184         case LINUX_AF_UNIX:
  185                 return (AF_LOCAL);
  186         case LINUX_AF_INET:
  187                 return (AF_INET);
  188         case LINUX_AF_INET6:
  189                 return (AF_INET6);
  190         case LINUX_AF_AX25:
  191                 return (AF_CCITT);
  192         case LINUX_AF_IPX:
  193                 return (AF_IPX);
  194         case LINUX_AF_APPLETALK:
  195                 return (AF_APPLETALK);
  196         }
  197         return (-1);
  198 }
  199 
  200 #ifndef __alpha__
  201 static int
  202 bsd_to_linux_domain(int domain)
  203 {
  204 
  205         switch (domain) {
  206         case AF_UNSPEC:
  207                 return (LINUX_AF_UNSPEC);
  208         case AF_LOCAL:
  209                 return (LINUX_AF_UNIX);
  210         case AF_INET:
  211                 return (LINUX_AF_INET);
  212         case AF_INET6:
  213                 return (LINUX_AF_INET6);
  214         case AF_CCITT:
  215                 return (LINUX_AF_AX25);
  216         case AF_IPX:
  217                 return (LINUX_AF_IPX);
  218         case AF_APPLETALK:
  219                 return (LINUX_AF_APPLETALK);
  220         }
  221         return (-1);
  222 }
  223 
  224 static int
  225 linux_to_bsd_sockopt_level(int level)
  226 {
  227 
  228         switch (level) {
  229         case LINUX_SOL_SOCKET:
  230                 return (SOL_SOCKET);
  231         }
  232         return (level);
  233 }
  234 
  235 static int
  236 bsd_to_linux_sockopt_level(int level)
  237 {
  238 
  239         switch (level) {
  240         case SOL_SOCKET:
  241                 return (LINUX_SOL_SOCKET);
  242         }
  243         return (level);
  244 }
  245 
  246 static int
  247 linux_to_bsd_ip_sockopt(int opt)
  248 {
  249 
  250         switch (opt) {
  251         case LINUX_IP_TOS:
  252                 return (IP_TOS);
  253         case LINUX_IP_TTL:
  254                 return (IP_TTL);
  255         case LINUX_IP_OPTIONS:
  256                 return (IP_OPTIONS);
  257         case LINUX_IP_MULTICAST_IF:
  258                 return (IP_MULTICAST_IF);
  259         case LINUX_IP_MULTICAST_TTL:
  260                 return (IP_MULTICAST_TTL);
  261         case LINUX_IP_MULTICAST_LOOP:
  262                 return (IP_MULTICAST_LOOP);
  263         case LINUX_IP_ADD_MEMBERSHIP:
  264                 return (IP_ADD_MEMBERSHIP);
  265         case LINUX_IP_DROP_MEMBERSHIP:
  266                 return (IP_DROP_MEMBERSHIP);
  267         case LINUX_IP_HDRINCL:
  268                 return (IP_HDRINCL);
  269         }
  270         return (-1);
  271 }
  272 
  273 static int
  274 linux_to_bsd_so_sockopt(int opt)
  275 {
  276 
  277         switch (opt) {
  278         case LINUX_SO_DEBUG:
  279                 return (SO_DEBUG);
  280         case LINUX_SO_REUSEADDR:
  281                 return (SO_REUSEADDR);
  282         case LINUX_SO_TYPE:
  283                 return (SO_TYPE);
  284         case LINUX_SO_ERROR:
  285                 return (SO_ERROR);
  286         case LINUX_SO_DONTROUTE:
  287                 return (SO_DONTROUTE);
  288         case LINUX_SO_BROADCAST:
  289                 return (SO_BROADCAST);
  290         case LINUX_SO_SNDBUF:
  291                 return (SO_SNDBUF);
  292         case LINUX_SO_RCVBUF:
  293                 return (SO_RCVBUF);
  294         case LINUX_SO_KEEPALIVE:
  295                 return (SO_KEEPALIVE);
  296         case LINUX_SO_OOBINLINE:
  297                 return (SO_OOBINLINE);
  298         case LINUX_SO_LINGER:
  299                 return (SO_LINGER);
  300         }
  301         return (-1);
  302 }
  303 
  304 static int
  305 linux_to_bsd_msg_flags(int flags)
  306 {
  307         int ret_flags = 0;
  308 
  309         if (flags & LINUX_MSG_OOB)
  310                 ret_flags |= MSG_OOB;
  311         if (flags & LINUX_MSG_PEEK)
  312                 ret_flags |= MSG_PEEK;
  313         if (flags & LINUX_MSG_DONTROUTE)
  314                 ret_flags |= MSG_DONTROUTE;
  315         if (flags & LINUX_MSG_CTRUNC)
  316                 ret_flags |= MSG_CTRUNC;
  317         if (flags & LINUX_MSG_TRUNC)
  318                 ret_flags |= MSG_TRUNC;
  319         if (flags & LINUX_MSG_DONTWAIT)
  320                 ret_flags |= MSG_DONTWAIT;
  321         if (flags & LINUX_MSG_EOR)
  322                 ret_flags |= MSG_EOR;
  323         if (flags & LINUX_MSG_WAITALL)
  324                 ret_flags |= MSG_WAITALL;
  325 #if 0 /* not handled */
  326         if (flags & LINUX_MSG_PROXY)
  327                 ;
  328         if (flags & LINUX_MSG_FIN)
  329                 ;
  330         if (flags & LINUX_MSG_SYN)
  331                 ;
  332         if (flags & LINUX_MSG_CONFIRM)
  333                 ;
  334         if (flags & LINUX_MSG_RST)
  335                 ;
  336         if (flags & LINUX_MSG_ERRQUEUE)
  337                 ;
  338         if (flags & LINUX_MSG_NOSIGNAL)
  339                 ;
  340 #endif
  341         return ret_flags;
  342 }
  343 
  344 static int
  345 linux_sa_put(struct osockaddr *osa)
  346 {
  347         struct osockaddr sa;
  348         int error, bdom;
  349 
  350         /*
  351          * Only read/write the osockaddr family part, the rest is
  352          * not changed.
  353          */
  354         error = copyin(osa, &sa, sizeof(sa.sa_family));
  355         if (error)
  356                 return (error);
  357 
  358         bdom = bsd_to_linux_domain(sa.sa_family);
  359         if (bdom == -1)
  360                 return (EINVAL);
  361 
  362         sa.sa_family = bdom;
  363         error = copyout(&sa, osa, sizeof(sa.sa_family));
  364         if (error)
  365                 return (error);
  366 
  367         return (0);
  368 }
  369 
  370 static int
  371 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags)
  372 {
  373         struct mbuf *control;
  374         struct sockaddr *to;
  375         int error;
  376 
  377         if (mp->msg_name != NULL) {
  378                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  379                 if (error)
  380                         return (error);
  381                 mp->msg_name = to;
  382         } else
  383                 to = NULL;
  384 
  385         if (mp->msg_control != NULL) {
  386                 struct cmsghdr *cmsg;
  387 
  388                 if (mp->msg_controllen < sizeof(struct cmsghdr)) {
  389                         error = EINVAL;
  390                         goto bad;
  391                 }
  392                 error = sockargs(&control, mp->msg_control,
  393                     mp->msg_controllen, MT_CONTROL);
  394                 if (error)
  395                         goto bad;
  396 
  397                 cmsg = mtod(control, struct cmsghdr *);
  398                 cmsg->cmsg_level = linux_to_bsd_sockopt_level(cmsg->cmsg_level);
  399         } else
  400                 control = NULL;
  401 
  402         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control);
  403 
  404 bad:
  405         if (to)
  406                 FREE(to, M_SONAME);
  407         return (error);
  408 }
  409 
  410 /* Return 0 if IP_HDRINCL is set for the given socket. */
  411 static int
  412 linux_check_hdrincl(struct thread *td, int s)
  413 {
  414         int error, optval, size_val;
  415 
  416         size_val = sizeof(optval);
  417         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  418             &optval, UIO_SYSSPACE, &size_val);
  419         if (error)
  420                 return (error);
  421 
  422         return (optval == 0);
  423 }
  424 
  425 struct linux_sendto_args {
  426         int s;
  427         l_uintptr_t msg;
  428         int len;
  429         int flags;
  430         l_uintptr_t to;
  431         int tolen;
  432 };
  433 
  434 /*
  435  * Updated sendto() when IP_HDRINCL is set:
  436  * tweak endian-dependent fields in the IP packet.
  437  */
  438 static int
  439 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  440 {
  441 /*
  442  * linux_ip_copysize defines how many bytes we should copy
  443  * from the beginning of the IP packet before we customize it for BSD.
  444  * It should include all the fields we modify (ip_len and ip_off)
  445  * and be as small as possible to minimize copying overhead.
  446  */
  447 #define linux_ip_copysize       8
  448 
  449         struct ip *packet;
  450         caddr_t sg = stackgap_init();
  451         struct msghdr msg;
  452         struct iovec aiov[2];
  453         int error;
  454 
  455         /* Check the packet isn't too small before we mess with it */
  456         if (linux_args->len < linux_ip_copysize)
  457                 return (EINVAL);
  458 
  459         /*
  460          * Tweaking the user buffer in place would be bad manners.
  461          * We create a corrected IP header with just the needed length,
  462          * then use an iovec to glue it to the rest of the user packet
  463          * when calling sendit().
  464          */
  465         packet = (struct ip *)stackgap_alloc(&sg, linux_ip_copysize);
  466 
  467         /* Make a copy of the beginning of the packet to be sent */
  468         if ((error = copyin(PTRIN(linux_args->msg), packet,
  469             linux_ip_copysize)))
  470                 return (error);
  471 
  472         /* Convert fields from Linux to BSD raw IP socket format */
  473         packet->ip_len = linux_args->len;
  474         packet->ip_off = ntohs(packet->ip_off);
  475 
  476         /* Prepare the msghdr and iovec structures describing the new packet */
  477         msg.msg_name = PTRIN(linux_args->to);
  478         msg.msg_namelen = linux_args->tolen;
  479         msg.msg_iov = aiov;
  480         msg.msg_iovlen = 2;
  481         msg.msg_control = NULL;
  482         msg.msg_flags = 0;
  483         aiov[0].iov_base = (char *)packet;
  484         aiov[0].iov_len = linux_ip_copysize;
  485         aiov[1].iov_base = (char *)PTRIN(linux_args->msg) +
  486             linux_ip_copysize;
  487         aiov[1].iov_len = linux_args->len - linux_ip_copysize;
  488         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags);
  489         return (error);
  490 }
  491 
  492 struct linux_socket_args {
  493         int domain;
  494         int type;
  495         int protocol;
  496 };
  497 
  498 static int
  499 linux_socket(struct thread *td, struct linux_socket_args *args)
  500 {
  501         struct linux_socket_args linux_args;
  502         struct socket_args /* {
  503                 int domain;
  504                 int type;
  505                 int protocol;
  506         } */ bsd_args;
  507         int error;
  508         int retval_socket;
  509 
  510         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  511                 return (error);
  512 
  513         bsd_args.protocol = linux_args.protocol;
  514         bsd_args.type = linux_args.type;
  515         bsd_args.domain = linux_to_bsd_domain(linux_args.domain);
  516         if (bsd_args.domain == -1)
  517                 return (EINVAL);
  518 
  519         retval_socket = socket(td, &bsd_args);
  520         if (bsd_args.type == SOCK_RAW
  521             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  522             && bsd_args.domain == AF_INET
  523             && retval_socket >= 0) {
  524                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  525                 int hdrincl;
  526 
  527                 hdrincl = 1;
  528                 /* We ignore any error returned by kern_setsockopt() */
  529                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  530                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  531         }
  532 #ifdef INET6
  533         /*
  534          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by
  535          * default and some apps depend on this. So, set V6ONLY to 0
  536          * for Linux apps if the sysctl value is set to 1.
  537          */
  538         if (bsd_args.domain == PF_INET6 && retval_socket >= 0
  539 #ifndef KLD_MODULE
  540             /*
  541              * XXX: Avoid undefined symbol error with an IPv4 only
  542              * kernel.
  543              */
  544             && ip6_v6only
  545 #endif
  546             ) {
  547                 int v6only;
  548 
  549                 v6only = 0;
  550                 /* We ignore any error returned by setsockopt() */
  551                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  552                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  553         }
  554 #endif
  555 
  556         return (retval_socket);
  557 }
  558 
  559 struct linux_bind_args {
  560         int s;
  561         l_uintptr_t name;
  562         int namelen;
  563 };
  564 
  565 static int
  566 linux_bind(struct thread *td, struct linux_bind_args *args)
  567 {
  568         struct linux_bind_args linux_args;
  569         struct sockaddr *sa;
  570         int error;
  571 
  572         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  573                 return (error);
  574 
  575         error = linux_getsockaddr(&sa, PTRIN(linux_args.name),
  576             linux_args.namelen);
  577         if (error)
  578                 return (error);
  579 
  580         return (kern_bind(td, linux_args.s, sa));
  581 }
  582 
  583 struct linux_connect_args {
  584         int s;
  585         l_uintptr_t name;
  586         int namelen;
  587 };
  588 int linux_connect(struct thread *, struct linux_connect_args *);
  589 #endif /* !__alpha__*/
  590 
  591 int
  592 linux_connect(struct thread *td, struct linux_connect_args *args)
  593 {
  594         struct linux_connect_args linux_args;
  595         struct socket *so;
  596         struct sockaddr *sa;
  597         u_int fflag;
  598         int error;
  599 
  600 #ifdef __alpha__
  601         bcopy(args, &linux_args, sizeof(linux_args));
  602 #else
  603         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  604                 return (error);
  605 #endif /* __alpha__ */
  606 
  607         error = linux_getsockaddr(&sa,
  608             (struct osockaddr *)PTRIN(linux_args.name),
  609             linux_args.namelen);
  610         if (error)
  611                 return (error);
  612 
  613         error = kern_connect(td, linux_args.s, sa);
  614         if (error != EISCONN)
  615                 return (error);
  616 
  617         /*
  618          * Linux doesn't return EISCONN the first time it occurs,
  619          * when on a non-blocking socket. Instead it returns the
  620          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  621          */
  622         if ((error = fgetsock(td, linux_args.s, &so, &fflag)) != 0)
  623                 return(error);
  624         error = EISCONN;
  625         if (fflag & FNONBLOCK) {
  626                 if (so->so_emuldata == 0)
  627                         error = so->so_error;
  628                 so->so_emuldata = (void *)1;
  629         }
  630         fputsock(so);
  631         return (error);
  632 }
  633 
  634 #ifndef __alpha__
  635 
  636 struct linux_listen_args {
  637         int s;
  638         int backlog;
  639 };
  640 
  641 static int
  642 linux_listen(struct thread *td, struct linux_listen_args *args)
  643 {
  644         struct linux_listen_args linux_args;
  645         struct listen_args /* {
  646                 int s;
  647                 int backlog;
  648         } */ bsd_args;
  649         int error;
  650 
  651         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  652                 return (error);
  653 
  654         bsd_args.s = linux_args.s;
  655         bsd_args.backlog = linux_args.backlog;
  656         return (listen(td, &bsd_args));
  657 }
  658 
  659 struct linux_accept_args {
  660         int s;
  661         l_uintptr_t addr;
  662         l_uintptr_t namelen;
  663 };
  664 
  665 static int
  666 linux_accept(struct thread *td, struct linux_accept_args *args)
  667 {
  668         struct linux_accept_args linux_args;
  669         struct accept_args /* {
  670                 int     s;
  671                 struct sockaddr * __restrict name;
  672                 socklen_t * __restrict anamelen;
  673         } */ bsd_args;
  674         struct close_args /* {
  675                 int     fd;
  676         } */ c_args;
  677         int error, fd;
  678 
  679         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  680                 return (error);
  681 
  682         bsd_args.s = linux_args.s;
  683         /* XXX: */
  684         bsd_args.name = (struct sockaddr * __restrict)PTRIN(linux_args.addr);
  685         bsd_args.anamelen = PTRIN(linux_args.namelen);/* XXX */
  686         error = oaccept(td, &bsd_args);
  687         if (error)
  688                 return (error);
  689         if (linux_args.addr) {
  690                 error = linux_sa_put(PTRIN(linux_args.addr));
  691                 if (error) {
  692                         c_args.fd = td->td_retval[0];
  693                         (void)close(td, &c_args);
  694                         return (error);
  695                 }
  696         }
  697 
  698         /*
  699          * linux appears not to copy flags from the parent socket to the
  700          * accepted one, so we must clear the flags in the new descriptor.
  701          * Ignore any errors, because we already have an open fd.
  702          */
  703         fd = td->td_retval[0];
  704         (void)kern_fcntl(td, fd, F_SETFL, 0);
  705         td->td_retval[0] = fd;
  706         return (0);
  707 }
  708 
  709 struct linux_getsockname_args {
  710         int s;
  711         l_uintptr_t addr;
  712         l_uintptr_t namelen;
  713 };
  714 
  715 static int
  716 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  717 {
  718         struct linux_getsockname_args linux_args;
  719         struct getsockname_args /* {
  720                 int     fdes;
  721                 struct sockaddr * __restrict asa;
  722                 socklen_t * __restrict alen;
  723         } */ bsd_args;
  724         int error;
  725 
  726         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  727                 return (error);
  728 
  729         bsd_args.fdes = linux_args.s;
  730         /* XXX: */
  731         bsd_args.asa = (struct sockaddr * __restrict)PTRIN(linux_args.addr);
  732         bsd_args.alen = PTRIN(linux_args.namelen);      /* XXX */
  733         error = ogetsockname(td, &bsd_args);
  734         if (error)
  735                 return (error);
  736         error = linux_sa_put(PTRIN(linux_args.addr));
  737         if (error)
  738                 return (error);
  739         return (0);
  740 }
  741 
  742 struct linux_getpeername_args {
  743         int s;
  744         l_uintptr_t addr;
  745         l_uintptr_t namelen;
  746 };
  747 
  748 static int
  749 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  750 {
  751         struct linux_getpeername_args linux_args;
  752         struct ogetpeername_args /* {
  753                 int fdes;
  754                 caddr_t asa;
  755                 int *alen;
  756         } */ bsd_args;
  757         int error;
  758 
  759         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  760                 return (error);
  761 
  762         bsd_args.fdes = linux_args.s;
  763         bsd_args.asa = (caddr_t)PTRIN(linux_args.addr);
  764         bsd_args.alen = (int *)PTRIN(linux_args.namelen);
  765         error = ogetpeername(td, &bsd_args);
  766         if (error)
  767                 return (error);
  768         error = linux_sa_put(PTRIN(linux_args.addr));
  769         if (error)
  770                 return (error);
  771         return (0);
  772 }
  773 
  774 struct linux_socketpair_args {
  775         int domain;
  776         int type;
  777         int protocol;
  778         l_uintptr_t rsv;
  779 };
  780 
  781 static int
  782 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  783 {
  784         struct linux_socketpair_args linux_args;
  785         struct socketpair_args /* {
  786                 int domain;
  787                 int type;
  788                 int protocol;
  789                 int *rsv;
  790         } */ bsd_args;
  791         int error;
  792 
  793         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  794                 return (error);
  795 
  796         bsd_args.domain = linux_to_bsd_domain(linux_args.domain);
  797         if (bsd_args.domain == -1)
  798                 return (EINVAL);
  799 
  800         bsd_args.type = linux_args.type;
  801         bsd_args.protocol = linux_args.protocol;
  802         bsd_args.rsv = (int *)PTRIN(linux_args.rsv);
  803         return (socketpair(td, &bsd_args));
  804 }
  805 
  806 struct linux_send_args {
  807         int s;
  808         l_uintptr_t msg;
  809         int len;
  810         int flags;
  811 };
  812 
  813 static int
  814 linux_send(struct thread *td, struct linux_send_args *args)
  815 {
  816         struct linux_send_args linux_args;
  817         struct sendto_args /* {
  818                 int s;
  819                 caddr_t buf;
  820                 int len;
  821                 int flags;
  822                 caddr_t to;
  823                 int tolen;
  824         } */ bsd_args;
  825         int error;
  826 
  827         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  828                 return (error);
  829 
  830         bsd_args.s = linux_args.s;
  831         bsd_args.buf = (caddr_t)PTRIN(linux_args.msg);
  832         bsd_args.len = linux_args.len;
  833         bsd_args.flags = linux_args.flags;
  834         bsd_args.to = NULL;
  835         bsd_args.tolen = 0;
  836         return (sendto(td, &bsd_args));
  837 }
  838 
  839 struct linux_recv_args {
  840         int s;
  841         l_uintptr_t msg;
  842         int len;
  843         int flags;
  844 };
  845 
  846 static int
  847 linux_recv(struct thread *td, struct linux_recv_args *args)
  848 {
  849         struct linux_recv_args linux_args;
  850         struct recvfrom_args /* {
  851                 int s;
  852                 caddr_t buf;
  853                 int len;
  854                 int flags;
  855                 struct sockaddr *from;
  856                 socklen_t fromlenaddr;
  857         } */ bsd_args;
  858         int error;
  859 
  860         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  861                 return (error);
  862 
  863         bsd_args.s = linux_args.s;
  864         bsd_args.buf = (caddr_t)PTRIN(linux_args.msg);
  865         bsd_args.len = linux_args.len;
  866         bsd_args.flags = linux_args.flags;
  867         bsd_args.from = NULL;
  868         bsd_args.fromlenaddr = 0;
  869         return (recvfrom(td, &bsd_args));
  870 }
  871 
  872 static int
  873 linux_sendto(struct thread *td, struct linux_sendto_args *args)
  874 {
  875         struct linux_sendto_args linux_args;
  876         struct msghdr msg;
  877         struct iovec aiov;
  878         int error;
  879 
  880         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  881                 return (error);
  882 
  883         if (linux_check_hdrincl(td, linux_args.s) == 0)
  884                 /* IP_HDRINCL set, tweak the packet before sending */
  885                 return (linux_sendto_hdrincl(td, &linux_args));
  886 
  887         msg.msg_name = PTRIN(linux_args.to);
  888         msg.msg_namelen = linux_args.tolen;
  889         msg.msg_iov = &aiov;
  890         msg.msg_iovlen = 1;
  891         msg.msg_control = NULL;
  892         msg.msg_flags = 0;
  893         aiov.iov_base = PTRIN(linux_args.msg);
  894         aiov.iov_len = linux_args.len;
  895         error = linux_sendit(td, linux_args.s, &msg, linux_args.flags);
  896         return (error);
  897 }
  898 
  899 struct linux_recvfrom_args {
  900         int s;
  901         l_uintptr_t buf;
  902         int len;
  903         int flags;
  904         l_uintptr_t from;
  905         l_uintptr_t fromlen;
  906 };
  907 
  908 static int
  909 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
  910 {
  911         struct linux_recvfrom_args linux_args;
  912         struct recvfrom_args /* {
  913                 int     s;
  914                 caddr_t buf;
  915                 size_t  len;
  916                 int     flags;
  917                 struct sockaddr * __restrict from;
  918                 socklen_t * __restrict fromlenaddr;
  919         } */ bsd_args;
  920         int error;
  921 
  922         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  923                 return (error);
  924 
  925         bsd_args.s = linux_args.s;
  926         bsd_args.buf = PTRIN(linux_args.buf);
  927         bsd_args.len = linux_args.len;
  928         bsd_args.flags = linux_to_bsd_msg_flags(linux_args.flags);
  929         /* XXX: */
  930         bsd_args.from = (struct sockaddr * __restrict)PTRIN(linux_args.from);
  931         bsd_args.fromlenaddr = PTRIN(linux_args.fromlen);/* XXX */
  932         error = orecvfrom(td, &bsd_args);
  933         if (error)
  934                 return (error);
  935         if (linux_args.from) {
  936                 error = linux_sa_put((struct osockaddr *)
  937                     PTRIN(linux_args.from));
  938                 if (error)
  939                         return (error);
  940         }
  941         return (0);
  942 }
  943 
  944 struct linux_sendmsg_args {
  945         int s;
  946         l_uintptr_t msg;
  947         int flags;
  948 };
  949 
  950 static int
  951 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
  952 {
  953         struct linux_sendmsg_args linux_args;
  954         struct msghdr msg;
  955         struct iovec *iov;
  956         int error;
  957 
  958         /* XXXTJR sendmsg is broken on amd64 */
  959 
  960         error = copyin(args, &linux_args, sizeof(linux_args));
  961         if (error)
  962                 return (error);
  963         error = copyin(PTRIN(linux_args.msg), &msg, sizeof(msg));
  964         if (error)
  965                 return (error);
  966         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
  967         if (error)
  968                 return (error);
  969         msg.msg_iov = iov;
  970         msg.msg_flags = 0;
  971         error = linux_sendit(td, linux_args.s, &msg, linux_args.flags);
  972         free(iov, M_IOV);
  973         return (error);
  974 }
  975 
  976 struct linux_recvmsg_args {
  977         int s;
  978         l_uintptr_t msg;
  979         int flags;
  980 };
  981 
  982 static int
  983 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
  984 {
  985         struct linux_recvmsg_args linux_args;
  986         struct recvmsg_args /* {
  987                 int     s;
  988                 struct  msghdr *msg;
  989                 int     flags;
  990         } */ bsd_args;
  991         struct msghdr msg;
  992         struct cmsghdr *cmsg;
  993         int error;
  994 
  995         /* XXXTJR recvmsg is broken on amd64 */
  996 
  997         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  998                 return (error);
  999 
 1000         bsd_args.s = linux_args.s;
 1001         bsd_args.msg = PTRIN(linux_args.msg);
 1002         bsd_args.flags = linux_to_bsd_msg_flags(linux_args.flags);
 1003         error = recvmsg(td, &bsd_args);
 1004         if (error)
 1005                 return (error);
 1006 
 1007         if (bsd_args.msg->msg_control != NULL &&
 1008             bsd_args.msg->msg_controllen > 0) {
 1009                 cmsg = (struct cmsghdr*)bsd_args.msg->msg_control;
 1010                 cmsg->cmsg_level = bsd_to_linux_sockopt_level(cmsg->cmsg_level);
 1011         }
 1012 
 1013         error = copyin(PTRIN(linux_args.msg), &msg, sizeof(msg));
 1014         if (error)
 1015                 return (error);
 1016         if (msg.msg_name && msg.msg_namelen > 2)
 1017                 error = linux_sa_put(msg.msg_name);
 1018         return (error);
 1019 }
 1020 
 1021 struct linux_shutdown_args {
 1022         int s;
 1023         int how;
 1024 };
 1025 
 1026 static int
 1027 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1028 {
 1029         struct linux_shutdown_args linux_args;
 1030         struct shutdown_args /* {
 1031                 int s;
 1032                 int how;
 1033         } */ bsd_args;
 1034         int error;
 1035 
 1036         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
 1037                 return (error);
 1038 
 1039         bsd_args.s = linux_args.s;
 1040         bsd_args.how = linux_args.how;
 1041         return (shutdown(td, &bsd_args));
 1042 }
 1043 
 1044 struct linux_setsockopt_args {
 1045         int s;
 1046         int level;
 1047         int optname;
 1048         l_uintptr_t optval;
 1049         int optlen;
 1050 };
 1051 
 1052 static int
 1053 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1054 {
 1055         struct linux_setsockopt_args linux_args;
 1056         struct setsockopt_args /* {
 1057                 int s;
 1058                 int level;
 1059                 int name;
 1060                 caddr_t val;
 1061                 int valsize;
 1062         } */ bsd_args;
 1063         int error, name;
 1064 
 1065         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
 1066                 return (error);
 1067 
 1068         bsd_args.s = linux_args.s;
 1069         bsd_args.level = linux_to_bsd_sockopt_level(linux_args.level);
 1070         switch (bsd_args.level) {
 1071         case SOL_SOCKET:
 1072                 name = linux_to_bsd_so_sockopt(linux_args.optname);
 1073                 break;
 1074         case IPPROTO_IP:
 1075                 name = linux_to_bsd_ip_sockopt(linux_args.optname);
 1076                 break;
 1077         case IPPROTO_TCP:
 1078                 /* Linux TCP option values match BSD's */
 1079                 name = linux_args.optname;
 1080                 break;
 1081         default:
 1082                 name = -1;
 1083                 break;
 1084         }
 1085         if (name == -1)
 1086                 return (EINVAL);
 1087 
 1088         bsd_args.name = name;
 1089         bsd_args.val = PTRIN(linux_args.optval);
 1090         bsd_args.valsize = linux_args.optlen;
 1091         return (setsockopt(td, &bsd_args));
 1092 }
 1093 
 1094 struct linux_getsockopt_args {
 1095         int s;
 1096         int level;
 1097         int optname;
 1098         l_uintptr_t optval;
 1099         l_uintptr_t optlen;
 1100 };
 1101 
 1102 static int
 1103 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1104 {
 1105         struct linux_getsockopt_args linux_args;
 1106         struct getsockopt_args /* {
 1107                 int s;
 1108                 int level;
 1109                 int name;
 1110                 caddr_t val;
 1111                 int *avalsize;
 1112         } */ bsd_args;
 1113         int error, name;
 1114 
 1115         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
 1116                 return (error);
 1117 
 1118         bsd_args.s = linux_args.s;
 1119         bsd_args.level = linux_to_bsd_sockopt_level(linux_args.level);
 1120         switch (bsd_args.level) {
 1121         case SOL_SOCKET:
 1122                 name = linux_to_bsd_so_sockopt(linux_args.optname);
 1123                 break;
 1124         case IPPROTO_IP:
 1125                 name = linux_to_bsd_ip_sockopt(linux_args.optname);
 1126                 break;
 1127         case IPPROTO_TCP:
 1128                 /* Linux TCP option values match BSD's */
 1129                 name = linux_args.optname;
 1130                 break;
 1131         default:
 1132                 name = -1;
 1133                 break;
 1134         }
 1135         if (name == -1)
 1136                 return (EINVAL);
 1137 
 1138         bsd_args.name = name;
 1139         bsd_args.val = PTRIN(linux_args.optval);
 1140         bsd_args.avalsize = PTRIN(linux_args.optlen);
 1141         return (getsockopt(td, &bsd_args));
 1142 }
 1143 
 1144 int
 1145 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1146 {
 1147         void *arg = (void *)(intptr_t)args->args;
 1148 
 1149         switch (args->what) {
 1150         case LINUX_SOCKET:
 1151                 return (linux_socket(td, arg));
 1152         case LINUX_BIND:
 1153                 return (linux_bind(td, arg));
 1154         case LINUX_CONNECT:
 1155                 return (linux_connect(td, arg));
 1156         case LINUX_LISTEN:
 1157                 return (linux_listen(td, arg));
 1158         case LINUX_ACCEPT:
 1159                 return (linux_accept(td, arg));
 1160         case LINUX_GETSOCKNAME:
 1161                 return (linux_getsockname(td, arg));
 1162         case LINUX_GETPEERNAME:
 1163                 return (linux_getpeername(td, arg));
 1164         case LINUX_SOCKETPAIR:
 1165                 return (linux_socketpair(td, arg));
 1166         case LINUX_SEND:
 1167                 return (linux_send(td, arg));
 1168         case LINUX_RECV:
 1169                 return (linux_recv(td, arg));
 1170         case LINUX_SENDTO:
 1171                 return (linux_sendto(td, arg));
 1172         case LINUX_RECVFROM:
 1173                 return (linux_recvfrom(td, arg));
 1174         case LINUX_SHUTDOWN:
 1175                 return (linux_shutdown(td, arg));
 1176         case LINUX_SETSOCKOPT:
 1177                 return (linux_setsockopt(td, arg));
 1178         case LINUX_GETSOCKOPT:
 1179                 return (linux_getsockopt(td, arg));
 1180         case LINUX_SENDMSG:
 1181                 return (linux_sendmsg(td, arg));
 1182         case LINUX_RECVMSG:
 1183                 return (linux_recvmsg(td, arg));
 1184         }
 1185 
 1186         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1187         return (ENOSYS);
 1188 }
 1189 #endif  /*!__alpha__*/

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