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/5.2/sys/compat/linux/linux_socket.c 122358 2003-11-09 17:04:04Z dwmalone $");
   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 <machine/../linux/linux.h>
   64 #include <machine/../linux/linux_proto.h>
   65 #include <compat/linux/linux_socket.h>
   66 #include <compat/linux/linux_util.h>
   67 
   68 static int do_sa_get(struct sockaddr **, const struct osockaddr *, int *,
   69     struct malloc_type *);
   70 static int linux_to_bsd_domain(int);
   71 
   72 /*
   73  * Reads a linux sockaddr and does any necessary translation.
   74  * Linux sockaddrs don't have a length field, only a family.
   75  */
   76 static int
   77 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int len)
   78 {
   79         int osalen = len;
   80 
   81         return (do_sa_get(sap, osa, &osalen, M_SONAME));
   82 }
   83 
   84 /*
   85  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   86  * family and convert to sockaddr.
   87  */
   88 static int
   89 do_sa_get(struct sockaddr **sap, const struct osockaddr *osa, int *osalen,
   90     struct malloc_type *mtype)
   91 {
   92         int error=0, bdom;
   93         struct sockaddr *sa;
   94         struct osockaddr *kosa;
   95         int alloclen;
   96 #ifdef INET6
   97         int oldv6size;
   98         struct sockaddr_in6 *sin6;
   99 #endif
  100 
  101         if (*osalen < 2 || *osalen > UCHAR_MAX || !osa)
  102                 return (EINVAL);
  103 
  104         alloclen = *osalen;
  105 #ifdef INET6
  106         oldv6size = 0;
  107         /*
  108          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  109          * if it's a v4-mapped address, so reserve the proper space
  110          * for it.
  111          */
  112         if (alloclen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) {
  113                 alloclen = sizeof (struct sockaddr_in6);
  114                 oldv6size = 1;
  115         }
  116 #endif
  117 
  118         MALLOC(kosa, struct osockaddr *, alloclen, mtype, M_WAITOK);
  119 
  120         if ((error = copyin(osa, kosa, *osalen)))
  121                 goto out;
  122 
  123         bdom = linux_to_bsd_domain(kosa->sa_family);
  124         if (bdom == -1) {
  125                 error = EINVAL;
  126                 goto out;
  127         }
  128 
  129 #ifdef INET6
  130         /*
  131          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  132          * which lacks the scope id compared with RFC2553 one. If we detect
  133          * the situation, reject the address and write a message to system log.
  134          *
  135          * Still accept addresses for which the scope id is not used.
  136          */
  137         if (oldv6size && bdom == AF_INET6) {
  138                 sin6 = (struct sockaddr_in6 *)kosa;
  139                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  140                     (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  141                      !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  142                      !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  143                      !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  144                      !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  145                         sin6->sin6_scope_id = 0;
  146                 } else {
  147                         log(LOG_DEBUG,
  148                             "obsolete pre-RFC2553 sockaddr_in6 rejected");
  149                         error = EINVAL;
  150                         goto out;
  151                 }
  152         } else
  153 #endif
  154         if (bdom == AF_INET)
  155                 alloclen = sizeof(struct sockaddr_in);
  156 
  157         sa = (struct sockaddr *) kosa;
  158         sa->sa_family = bdom;
  159         sa->sa_len = alloclen;
  160 
  161         *sap = sa;
  162         *osalen = alloclen;
  163         return (0);
  164 
  165 out:
  166         FREE(kosa, mtype);
  167         return (error);
  168 }
  169 
  170 static int
  171 linux_to_bsd_domain(int domain)
  172 {
  173 
  174         switch (domain) {
  175         case LINUX_AF_UNSPEC:
  176                 return (AF_UNSPEC);
  177         case LINUX_AF_UNIX:
  178                 return (AF_LOCAL);
  179         case LINUX_AF_INET:
  180                 return (AF_INET);
  181         case LINUX_AF_INET6:
  182                 return (AF_INET6);
  183         case LINUX_AF_AX25:
  184                 return (AF_CCITT);
  185         case LINUX_AF_IPX:
  186                 return (AF_IPX);
  187         case LINUX_AF_APPLETALK:
  188                 return (AF_APPLETALK);
  189         }
  190         return (-1);
  191 }
  192 
  193 #ifndef __alpha__
  194 static int
  195 bsd_to_linux_domain(int domain)
  196 {
  197 
  198         switch (domain) {
  199         case AF_UNSPEC:
  200                 return (LINUX_AF_UNSPEC);
  201         case AF_LOCAL:
  202                 return (LINUX_AF_UNIX);
  203         case AF_INET:
  204                 return (LINUX_AF_INET);
  205         case AF_INET6:
  206                 return (LINUX_AF_INET6);
  207         case AF_CCITT:
  208                 return (LINUX_AF_AX25);
  209         case AF_IPX:
  210                 return (LINUX_AF_IPX);
  211         case AF_APPLETALK:
  212                 return (LINUX_AF_APPLETALK);
  213         }
  214         return (-1);
  215 }
  216 
  217 static int
  218 linux_to_bsd_sockopt_level(int level)
  219 {
  220 
  221         switch (level) {
  222         case LINUX_SOL_SOCKET:
  223                 return (SOL_SOCKET);
  224         }
  225         return (level);
  226 }
  227 
  228 static int
  229 bsd_to_linux_sockopt_level(int level)
  230 {
  231 
  232         switch (level) {
  233         case SOL_SOCKET:
  234                 return (LINUX_SOL_SOCKET);
  235         }
  236         return (level);
  237 }
  238 
  239 static int
  240 linux_to_bsd_ip_sockopt(int opt)
  241 {
  242 
  243         switch (opt) {
  244         case LINUX_IP_TOS:
  245                 return (IP_TOS);
  246         case LINUX_IP_TTL:
  247                 return (IP_TTL);
  248         case LINUX_IP_OPTIONS:
  249                 return (IP_OPTIONS);
  250         case LINUX_IP_MULTICAST_IF:
  251                 return (IP_MULTICAST_IF);
  252         case LINUX_IP_MULTICAST_TTL:
  253                 return (IP_MULTICAST_TTL);
  254         case LINUX_IP_MULTICAST_LOOP:
  255                 return (IP_MULTICAST_LOOP);
  256         case LINUX_IP_ADD_MEMBERSHIP:
  257                 return (IP_ADD_MEMBERSHIP);
  258         case LINUX_IP_DROP_MEMBERSHIP:
  259                 return (IP_DROP_MEMBERSHIP);
  260         case LINUX_IP_HDRINCL:
  261                 return (IP_HDRINCL);
  262         }
  263         return (-1);
  264 }
  265 
  266 static int
  267 linux_to_bsd_so_sockopt(int opt)
  268 {
  269 
  270         switch (opt) {
  271         case LINUX_SO_DEBUG:
  272                 return (SO_DEBUG);
  273         case LINUX_SO_REUSEADDR:
  274                 return (SO_REUSEADDR);
  275         case LINUX_SO_TYPE:
  276                 return (SO_TYPE);
  277         case LINUX_SO_ERROR:
  278                 return (SO_ERROR);
  279         case LINUX_SO_DONTROUTE:
  280                 return (SO_DONTROUTE);
  281         case LINUX_SO_BROADCAST:
  282                 return (SO_BROADCAST);
  283         case LINUX_SO_SNDBUF:
  284                 return (SO_SNDBUF);
  285         case LINUX_SO_RCVBUF:
  286                 return (SO_RCVBUF);
  287         case LINUX_SO_KEEPALIVE:
  288                 return (SO_KEEPALIVE);
  289         case LINUX_SO_OOBINLINE:
  290                 return (SO_OOBINLINE);
  291         case LINUX_SO_LINGER:
  292                 return (SO_LINGER);
  293         }
  294         return (-1);
  295 }
  296 
  297 static int
  298 linux_to_bsd_msg_flags(int flags)
  299 {
  300         int ret_flags = 0;
  301 
  302         if (flags & LINUX_MSG_OOB)
  303                 ret_flags |= MSG_OOB;
  304         if (flags & LINUX_MSG_PEEK)
  305                 ret_flags |= MSG_PEEK;
  306         if (flags & LINUX_MSG_DONTROUTE)
  307                 ret_flags |= MSG_DONTROUTE;
  308         if (flags & LINUX_MSG_CTRUNC)
  309                 ret_flags |= MSG_CTRUNC;
  310         if (flags & LINUX_MSG_TRUNC)
  311                 ret_flags |= MSG_TRUNC;
  312         if (flags & LINUX_MSG_DONTWAIT)
  313                 ret_flags |= MSG_DONTWAIT;
  314         if (flags & LINUX_MSG_EOR)
  315                 ret_flags |= MSG_EOR;
  316         if (flags & LINUX_MSG_WAITALL)
  317                 ret_flags |= MSG_WAITALL;
  318 #if 0 /* not handled */
  319         if (flags & LINUX_MSG_PROXY)
  320                 ;
  321         if (flags & LINUX_MSG_FIN)
  322                 ;
  323         if (flags & LINUX_MSG_SYN)
  324                 ;
  325         if (flags & LINUX_MSG_CONFIRM)
  326                 ;
  327         if (flags & LINUX_MSG_RST)
  328                 ;
  329         if (flags & LINUX_MSG_ERRQUEUE)
  330                 ;
  331         if (flags & LINUX_MSG_NOSIGNAL)
  332                 ;
  333 #endif
  334         return ret_flags;
  335 }
  336 
  337 static int
  338 linux_sa_put(struct osockaddr *osa)
  339 {
  340         struct osockaddr sa;
  341         int error, bdom;
  342 
  343         /*
  344          * Only read/write the osockaddr family part, the rest is
  345          * not changed.
  346          */
  347         error = copyin(osa, &sa, sizeof(sa.sa_family));
  348         if (error)
  349                 return (error);
  350 
  351         bdom = bsd_to_linux_domain(sa.sa_family);
  352         if (bdom == -1)
  353                 return (EINVAL);
  354 
  355         sa.sa_family = bdom;
  356         error = copyout(&sa, osa, sizeof(sa.sa_family));
  357         if (error)
  358                 return (error);
  359 
  360         return (0);
  361 }
  362 
  363 static int
  364 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags)
  365 {
  366         struct mbuf *control;
  367         struct sockaddr *to;
  368         int error;
  369 
  370         if (mp->msg_name != NULL) {
  371                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  372                 if (error)
  373                         return (error);
  374                 mp->msg_name = to;
  375         } else
  376                 to = NULL;
  377 
  378         if (mp->msg_control != NULL) {
  379                 struct cmsghdr *cmsg;
  380 
  381                 if (mp->msg_controllen < sizeof(struct cmsghdr)) {
  382                         error = EINVAL;
  383                         goto bad;
  384                 }
  385                 error = sockargs(&control, mp->msg_control,
  386                     mp->msg_controllen, MT_CONTROL);
  387                 if (error)
  388                         goto bad;
  389 
  390                 cmsg = mtod(control, struct cmsghdr *);
  391                 cmsg->cmsg_level = linux_to_bsd_sockopt_level(cmsg->cmsg_level);
  392         } else
  393                 control = NULL;
  394 
  395         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control);
  396 
  397 bad:
  398         if (to)
  399                 FREE(to, M_SONAME);
  400         return (error);
  401 }
  402 
  403 /* Return 0 if IP_HDRINCL is set for the given socket. */
  404 static int
  405 linux_check_hdrincl(struct thread *td, caddr_t *sg, int s)
  406 {
  407         struct getsockopt_args /* {
  408                 int s;
  409                 int level;
  410                 int name;
  411                 caddr_t val;
  412                 int *avalsize;
  413         } */ bsd_args;
  414         int error;
  415         caddr_t val, valsize;
  416         int size_val = sizeof val;
  417         int optval;
  418 
  419         val = stackgap_alloc(sg, sizeof(int));
  420         valsize = stackgap_alloc(sg, sizeof(int));
  421 
  422         if ((error = copyout(&size_val, valsize, sizeof(size_val))))
  423                 return (error);
  424 
  425         bsd_args.s = s;
  426         bsd_args.level = IPPROTO_IP;
  427         bsd_args.name = IP_HDRINCL;
  428         bsd_args.val = val;
  429         bsd_args.avalsize = (int *)valsize;
  430         if ((error = getsockopt(td, &bsd_args)))
  431                 return (error);
  432 
  433         if ((error = copyin(val, &optval, sizeof(optval))))
  434                 return (error);
  435 
  436         return (optval == 0);
  437 }
  438 
  439 struct linux_sendto_args {
  440         int s;
  441         void *msg;
  442         int len;
  443         int flags;
  444         caddr_t to;
  445         int tolen;
  446 };
  447 
  448 /*
  449  * Updated sendto() when IP_HDRINCL is set:
  450  * tweak endian-dependent fields in the IP packet.
  451  */
  452 static int
  453 linux_sendto_hdrincl(struct thread *td, caddr_t *sg, struct linux_sendto_args *linux_args)
  454 {
  455 /*
  456  * linux_ip_copysize defines how many bytes we should copy
  457  * from the beginning of the IP packet before we customize it for BSD.
  458  * It should include all the fields we modify (ip_len and ip_off)
  459  * and be as small as possible to minimize copying overhead.
  460  */
  461 #define linux_ip_copysize       8
  462 
  463         struct ip *packet;
  464         struct msghdr msg;
  465         struct iovec aiov[2];
  466         int error;
  467 
  468         /* Check the packet isn't too small before we mess with it */
  469         if (linux_args->len < linux_ip_copysize)
  470                 return (EINVAL);
  471 
  472         /*
  473          * Tweaking the user buffer in place would be bad manners.
  474          * We create a corrected IP header with just the needed length,
  475          * then use an iovec to glue it to the rest of the user packet
  476          * when calling sendit().
  477          */
  478         packet = (struct ip *)stackgap_alloc(sg, linux_ip_copysize);
  479 
  480         /* Make a copy of the beginning of the packet to be sent */
  481         if ((error = copyin(linux_args->msg, packet, linux_ip_copysize)))
  482                 return (error);
  483 
  484         /* Convert fields from Linux to BSD raw IP socket format */
  485         packet->ip_len = linux_args->len;
  486         packet->ip_off = ntohs(packet->ip_off);
  487 
  488         /* Prepare the msghdr and iovec structures describing the new packet */
  489         msg.msg_name = linux_args->to;
  490         msg.msg_namelen = linux_args->tolen;
  491         msg.msg_iov = aiov;
  492         msg.msg_iovlen = 2;
  493         msg.msg_control = NULL;
  494         msg.msg_flags = 0;
  495         aiov[0].iov_base = (char *)packet;
  496         aiov[0].iov_len = linux_ip_copysize;
  497         aiov[1].iov_base = (char *)(linux_args->msg) + linux_ip_copysize;
  498         aiov[1].iov_len = linux_args->len - linux_ip_copysize;
  499         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags);
  500         return (error);
  501 }
  502 
  503 struct linux_socket_args {
  504         int domain;
  505         int type;
  506         int protocol;
  507 };
  508 
  509 static int
  510 linux_socket(struct thread *td, struct linux_socket_args *args)
  511 {
  512         struct linux_socket_args linux_args;
  513         struct socket_args /* {
  514                 int domain;
  515                 int type;
  516                 int protocol;
  517         } */ bsd_args;
  518         struct setsockopt_args /* {
  519                 int s;
  520                 int level;
  521                 int name;
  522                 caddr_t val;
  523                 int valsize;
  524         } */ bsd_setsockopt_args;
  525         int error;
  526         int retval_socket;
  527 
  528         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  529                 return (error);
  530 
  531         bsd_args.protocol = linux_args.protocol;
  532         bsd_args.type = linux_args.type;
  533         bsd_args.domain = linux_to_bsd_domain(linux_args.domain);
  534         if (bsd_args.domain == -1)
  535                 return (EINVAL);
  536 
  537         retval_socket = socket(td, &bsd_args);
  538         if (bsd_args.type == SOCK_RAW
  539             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  540             && bsd_args.domain == AF_INET
  541             && retval_socket >= 0) {
  542                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  543                 caddr_t sg;
  544                 int *hdrincl;
  545 
  546                 sg = stackgap_init();
  547                 hdrincl = (int *)stackgap_alloc(&sg, sizeof(*hdrincl));
  548                 *hdrincl = 1;
  549                 bsd_setsockopt_args.s = td->td_retval[0];
  550                 bsd_setsockopt_args.level = IPPROTO_IP;
  551                 bsd_setsockopt_args.name = IP_HDRINCL;
  552                 bsd_setsockopt_args.val = (caddr_t)hdrincl;
  553                 bsd_setsockopt_args.valsize = sizeof(*hdrincl);
  554                 /* We ignore any error returned by setsockopt() */
  555                 setsockopt(td, &bsd_setsockopt_args);
  556                 /* Copy back the return value from socket() */
  557                 td->td_retval[0] = bsd_setsockopt_args.s;
  558         }
  559 #ifdef INET6
  560         /*
  561          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by
  562          * default and some apps depend on this. So, set V6ONLY to 0
  563          * for Linux apps if the sysctl value is set to 1.
  564          */
  565         if (bsd_args.domain == PF_INET6 && retval_socket >= 0
  566 #ifndef KLD_MODULE
  567             /*
  568              * XXX: Avoid undefined symbol error with an IPv4 only
  569              * kernel.
  570              */
  571             && ip6_v6only
  572 #endif
  573             ) {
  574                 caddr_t sg;
  575                 int *v6only;
  576 
  577                 sg = stackgap_init();
  578                 v6only = (int *)stackgap_alloc(&sg, sizeof(*v6only));
  579                 *v6only = 0;
  580                 bsd_setsockopt_args.s = td->td_retval[0];
  581                 bsd_setsockopt_args.level = IPPROTO_IPV6;
  582                 bsd_setsockopt_args.name = IPV6_V6ONLY;
  583                 bsd_setsockopt_args.val = (caddr_t)v6only;
  584                 bsd_setsockopt_args.valsize = sizeof(*v6only);
  585                 /* We ignore any error returned by setsockopt() */
  586                 setsockopt(td, &bsd_setsockopt_args);
  587                 /* Copy back the return value from socket() */
  588                 td->td_retval[0] = bsd_setsockopt_args.s;
  589         }
  590 #endif
  591 
  592         return (retval_socket);
  593 }
  594 
  595 struct linux_bind_args {
  596         int s;
  597         struct osockaddr *name;
  598         int namelen;
  599 };
  600 
  601 static int
  602 linux_bind(struct thread *td, struct linux_bind_args *args)
  603 {
  604         struct linux_bind_args linux_args;
  605         struct sockaddr *sa;
  606         int error;
  607 
  608         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  609                 return (error);
  610 
  611         error = linux_getsockaddr(&sa, linux_args.name, linux_args.namelen);
  612         if (error)
  613                 return (error);
  614 
  615         return (kern_bind(td, linux_args.s, sa));
  616 }
  617 
  618 struct linux_connect_args {
  619         int s;
  620         struct osockaddr * name;
  621         int namelen;
  622 };
  623 int linux_connect(struct thread *, struct linux_connect_args *);
  624 #endif /* !__alpha__*/
  625 
  626 int
  627 linux_connect(struct thread *td, struct linux_connect_args *args)
  628 {
  629         struct linux_connect_args linux_args;
  630         struct socket *so;
  631         struct sockaddr *sa;
  632         u_int fflag;
  633         int error;
  634 
  635 #ifdef __alpha__
  636         bcopy(args, &linux_args, sizeof(linux_args));
  637 #else
  638         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  639                 return (error);
  640 #endif /* __alpha__ */
  641 
  642         error = linux_getsockaddr(&sa, (struct osockaddr *)linux_args.name,
  643             linux_args.namelen);
  644         if (error)
  645                 return (error);
  646 
  647         error = kern_connect(td, linux_args.s, sa);
  648         if (error != EISCONN)
  649                 return (error);
  650 
  651         /*
  652          * Linux doesn't return EISCONN the first time it occurs,
  653          * when on a non-blocking socket. Instead it returns the
  654          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  655          */
  656         if ((error = fgetsock(td, linux_args.s, &so, &fflag)) != 0)
  657                 return(error);
  658         error = EISCONN;
  659         if (fflag & FNONBLOCK) {
  660                 if (so->so_emuldata == 0)
  661                         error = so->so_error;
  662                 so->so_emuldata = (void *)1;
  663         }
  664         fputsock(so);
  665         return (error);
  666 }
  667 
  668 #ifndef __alpha__
  669 
  670 struct linux_listen_args {
  671         int s;
  672         int backlog;
  673 };
  674 
  675 static int
  676 linux_listen(struct thread *td, struct linux_listen_args *args)
  677 {
  678         struct linux_listen_args linux_args;
  679         struct listen_args /* {
  680                 int s;
  681                 int backlog;
  682         } */ bsd_args;
  683         int error;
  684 
  685         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  686                 return (error);
  687 
  688         bsd_args.s = linux_args.s;
  689         bsd_args.backlog = linux_args.backlog;
  690         return (listen(td, &bsd_args));
  691 }
  692 
  693 struct linux_accept_args {
  694         int s;
  695         struct osockaddr *addr;
  696         int *namelen;
  697 };
  698 
  699 static int
  700 linux_accept(struct thread *td, struct linux_accept_args *args)
  701 {
  702         struct linux_accept_args linux_args;
  703         struct accept_args /* {
  704                 int s;
  705                 caddr_t name;
  706                 int *anamelen;
  707         } */ bsd_args;
  708         struct close_args /* {
  709                 int     fd;
  710         } */ c_args;
  711         struct fcntl_args /* {
  712                 int fd;
  713                 int cmd;
  714                 long arg;
  715         } */ f_args;
  716         int error;
  717 
  718         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  719                 return (error);
  720 
  721         bsd_args.s = linux_args.s;
  722         bsd_args.name = (caddr_t)linux_args.addr;
  723         bsd_args.anamelen = linux_args.namelen;
  724         error = oaccept(td, &bsd_args);
  725         if (error)
  726                 return (error);
  727         if (linux_args.addr) {
  728                 error = linux_sa_put(linux_args.addr);
  729                 if (error) {
  730                         c_args.fd = td->td_retval[0];
  731                         (void)close(td, &c_args);
  732                         return (error);
  733                 }
  734         }
  735 
  736         /*
  737          * linux appears not to copy flags from the parent socket to the
  738          * accepted one, so we must clear the flags in the new descriptor.
  739          * Ignore any errors, because we already have an open fd.
  740          */
  741         f_args.fd = td->td_retval[0];
  742         f_args.cmd = F_SETFL;
  743         f_args.arg = 0;
  744         (void)fcntl(td, &f_args);
  745         td->td_retval[0] = f_args.fd;
  746         return (0);
  747 }
  748 
  749 struct linux_getsockname_args {
  750         int s;
  751         struct osockaddr *addr;
  752         int *namelen;
  753 };
  754 
  755 static int
  756 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  757 {
  758         struct linux_getsockname_args linux_args;
  759         struct getsockname_args /* {
  760                 int fdes;
  761                 caddr_t asa;
  762                 int *alen;
  763         } */ bsd_args;
  764         int error;
  765 
  766         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  767                 return (error);
  768 
  769         bsd_args.fdes = linux_args.s;
  770         bsd_args.asa = (caddr_t) linux_args.addr;
  771         bsd_args.alen = linux_args.namelen;
  772         error = ogetsockname(td, &bsd_args);
  773         if (error)
  774                 return (error);
  775         error = linux_sa_put(linux_args.addr);
  776         if (error)
  777                 return (error);
  778         return (0);
  779 }
  780 
  781 struct linux_getpeername_args {
  782         int s;
  783         struct osockaddr *addr;
  784         int *namelen;
  785 };
  786 
  787 static int
  788 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  789 {
  790         struct linux_getpeername_args linux_args;
  791         struct ogetpeername_args /* {
  792                 int fdes;
  793                 caddr_t asa;
  794                 int *alen;
  795         } */ bsd_args;
  796         int error;
  797 
  798         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  799                 return (error);
  800 
  801         bsd_args.fdes = linux_args.s;
  802         bsd_args.asa = (caddr_t) linux_args.addr;
  803         bsd_args.alen = linux_args.namelen;
  804         error = ogetpeername(td, &bsd_args);
  805         if (error)
  806                 return (error);
  807         error = linux_sa_put(linux_args.addr);
  808         if (error)
  809                 return (error);
  810         return (0);
  811 }
  812 
  813 struct linux_socketpair_args {
  814         int domain;
  815         int type;
  816         int protocol;
  817         int *rsv;
  818 };
  819 
  820 static int
  821 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  822 {
  823         struct linux_socketpair_args linux_args;
  824         struct socketpair_args /* {
  825                 int domain;
  826                 int type;
  827                 int protocol;
  828                 int *rsv;
  829         } */ bsd_args;
  830         int error;
  831 
  832         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  833                 return (error);
  834 
  835         bsd_args.domain = linux_to_bsd_domain(linux_args.domain);
  836         if (bsd_args.domain == -1)
  837                 return (EINVAL);
  838 
  839         bsd_args.type = linux_args.type;
  840         bsd_args.protocol = linux_args.protocol;
  841         bsd_args.rsv = linux_args.rsv;
  842         return (socketpair(td, &bsd_args));
  843 }
  844 
  845 struct linux_send_args {
  846         int s;
  847         void *msg;
  848         int len;
  849         int flags;
  850 };
  851 
  852 static int
  853 linux_send(struct thread *td, struct linux_send_args *args)
  854 {
  855         struct linux_send_args linux_args;
  856         struct osend_args /* {
  857                 int s;
  858                 caddr_t buf;
  859                 int len;
  860                 int flags;
  861         } */ bsd_args;
  862         int error;
  863 
  864         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  865                 return (error);
  866 
  867         bsd_args.s = linux_args.s;
  868         bsd_args.buf = linux_args.msg;
  869         bsd_args.len = linux_args.len;
  870         bsd_args.flags = linux_args.flags;
  871         return (osend(td, &bsd_args));
  872 }
  873 
  874 struct linux_recv_args {
  875         int s;
  876         void *msg;
  877         int len;
  878         int flags;
  879 };
  880 
  881 static int
  882 linux_recv(struct thread *td, struct linux_recv_args *args)
  883 {
  884         struct linux_recv_args linux_args;
  885         struct orecv_args /* {
  886                 int s;
  887                 caddr_t buf;
  888                 int len;
  889                 int flags;
  890         } */ bsd_args;
  891         int error;
  892 
  893         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  894                 return (error);
  895 
  896         bsd_args.s = linux_args.s;
  897         bsd_args.buf = linux_args.msg;
  898         bsd_args.len = linux_args.len;
  899         bsd_args.flags = linux_args.flags;
  900         return (orecv(td, &bsd_args));
  901 }
  902 
  903 static int
  904 linux_sendto(struct thread *td, struct linux_sendto_args *args)
  905 {
  906         struct linux_sendto_args linux_args;
  907         struct msghdr msg;
  908         struct iovec aiov;
  909         caddr_t sg = stackgap_init();
  910         int error;
  911 
  912         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  913                 return (error);
  914 
  915         if (linux_check_hdrincl(td, &sg, linux_args.s) == 0)
  916                 /* IP_HDRINCL set, tweak the packet before sending */
  917                 return (linux_sendto_hdrincl(td, &sg, &linux_args));
  918 
  919         msg.msg_name = linux_args.to;
  920         msg.msg_namelen = linux_args.tolen;
  921         msg.msg_iov = &aiov;
  922         msg.msg_iovlen = 1;
  923         msg.msg_control = NULL;
  924         msg.msg_flags = 0;
  925         aiov.iov_base = linux_args.msg;
  926         aiov.iov_len = linux_args.len;
  927         error = linux_sendit(td, linux_args.s, &msg, linux_args.flags);
  928         return (error);
  929 }
  930 
  931 struct linux_recvfrom_args {
  932         int s;
  933         void *buf;
  934         int len;
  935         int flags;
  936         caddr_t from;
  937         int *fromlen;
  938 };
  939 
  940 static int
  941 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
  942 {
  943         struct linux_recvfrom_args linux_args;
  944         struct recvfrom_args /* {
  945                 int s;
  946                 caddr_t buf;
  947                 size_t len;
  948                 int flags;
  949                 caddr_t from;
  950                 int *fromlenaddr;
  951         } */ bsd_args;
  952         int error;
  953 
  954         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  955                 return (error);
  956 
  957         bsd_args.s = linux_args.s;
  958         bsd_args.buf = linux_args.buf;
  959         bsd_args.len = linux_args.len;
  960         bsd_args.flags = linux_to_bsd_msg_flags(linux_args.flags);
  961         bsd_args.from = linux_args.from;
  962         bsd_args.fromlenaddr = linux_args.fromlen;
  963         error = orecvfrom(td, &bsd_args);
  964         if (error)
  965                 return (error);
  966         if (linux_args.from) {
  967                 error = linux_sa_put((struct osockaddr *) linux_args.from);
  968                 if (error)
  969                         return (error);
  970         }
  971         return (0);
  972 }
  973 
  974 struct linux_sendmsg_args {
  975         int s;
  976         const struct msghdr *msg;
  977         int flags;
  978 };
  979 
  980 static int
  981 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
  982 {
  983         struct linux_sendmsg_args linux_args;
  984         struct msghdr msg;
  985         struct iovec aiov[UIO_SMALLIOV], *iov;
  986         int error;
  987 
  988         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
  989                 return (error);
  990 
  991         error = copyin(linux_args.msg, &msg, sizeof(msg));
  992         if (error)
  993                 return (error);
  994         if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
  995                 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
  996                         return (EMSGSIZE);
  997                 MALLOC(iov, struct iovec *,
  998                         sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV,
  999                         M_WAITOK);
 1000         } else {
 1001                 iov = aiov;
 1002         }
 1003         if (msg.msg_iovlen &&
 1004             (error = copyin(msg.msg_iov, iov,
 1005             (unsigned)(msg.msg_iovlen * sizeof (struct iovec)))))
 1006                 goto done;
 1007         msg.msg_iov = iov;
 1008         msg.msg_flags = 0;
 1009 
 1010         error = linux_sendit(td, linux_args.s, &msg, linux_args.flags);
 1011 done:
 1012         if (iov != aiov)
 1013                 FREE(iov, M_IOV);
 1014         return (error);
 1015 }
 1016 
 1017 struct linux_recvmsg_args {
 1018         int s;
 1019         struct msghdr *msg;
 1020         int flags;
 1021 };
 1022 
 1023 static int
 1024 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
 1025 {
 1026         struct linux_recvmsg_args linux_args;
 1027         struct recvmsg_args /* {
 1028                 int     s;
 1029                 struct  msghdr *msg;
 1030                 int     flags;
 1031         } */ bsd_args;
 1032         struct msghdr msg;
 1033         struct cmsghdr *cmsg;
 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.msg = linux_args.msg;
 1041         bsd_args.flags = linux_to_bsd_msg_flags(linux_args.flags);
 1042         error = recvmsg(td, &bsd_args);
 1043         if (error)
 1044                 return (error);
 1045 
 1046         if (bsd_args.msg->msg_control != NULL) {
 1047                 cmsg = (struct cmsghdr*)bsd_args.msg->msg_control;
 1048                 cmsg->cmsg_level = bsd_to_linux_sockopt_level(cmsg->cmsg_level);
 1049         }
 1050 
 1051         error = copyin(linux_args.msg, &msg, sizeof(msg));
 1052         if (error)
 1053                 return (error);
 1054         if (msg.msg_name && msg.msg_namelen > 2)
 1055                 error = linux_sa_put(msg.msg_name);
 1056         return (error);
 1057 }
 1058 
 1059 struct linux_shutdown_args {
 1060         int s;
 1061         int how;
 1062 };
 1063 
 1064 static int
 1065 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1066 {
 1067         struct linux_shutdown_args linux_args;
 1068         struct shutdown_args /* {
 1069                 int s;
 1070                 int how;
 1071         } */ bsd_args;
 1072         int error;
 1073 
 1074         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
 1075                 return (error);
 1076 
 1077         bsd_args.s = linux_args.s;
 1078         bsd_args.how = linux_args.how;
 1079         return (shutdown(td, &bsd_args));
 1080 }
 1081 
 1082 struct linux_setsockopt_args {
 1083         int s;
 1084         int level;
 1085         int optname;
 1086         void *optval;
 1087         int optlen;
 1088 };
 1089 
 1090 static int
 1091 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1092 {
 1093         struct linux_setsockopt_args linux_args;
 1094         struct setsockopt_args /* {
 1095                 int s;
 1096                 int level;
 1097                 int name;
 1098                 caddr_t val;
 1099                 int valsize;
 1100         } */ bsd_args;
 1101         int error, name;
 1102 
 1103         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
 1104                 return (error);
 1105 
 1106         bsd_args.s = linux_args.s;
 1107         bsd_args.level = linux_to_bsd_sockopt_level(linux_args.level);
 1108         switch (bsd_args.level) {
 1109         case SOL_SOCKET:
 1110                 name = linux_to_bsd_so_sockopt(linux_args.optname);
 1111                 break;
 1112         case IPPROTO_IP:
 1113                 name = linux_to_bsd_ip_sockopt(linux_args.optname);
 1114                 break;
 1115         case IPPROTO_TCP:
 1116                 /* Linux TCP option values match BSD's */
 1117                 name = linux_args.optname;
 1118                 break;
 1119         default:
 1120                 name = -1;
 1121                 break;
 1122         }
 1123         if (name == -1)
 1124                 return (EINVAL);
 1125 
 1126         bsd_args.name = name;
 1127         bsd_args.val = linux_args.optval;
 1128         bsd_args.valsize = linux_args.optlen;
 1129         return (setsockopt(td, &bsd_args));
 1130 }
 1131 
 1132 struct linux_getsockopt_args {
 1133         int s;
 1134         int level;
 1135         int optname;
 1136         void *optval;
 1137         int *optlen;
 1138 };
 1139 
 1140 static int
 1141 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1142 {
 1143         struct linux_getsockopt_args linux_args;
 1144         struct getsockopt_args /* {
 1145                 int s;
 1146                 int level;
 1147                 int name;
 1148                 caddr_t val;
 1149                 int *avalsize;
 1150         } */ bsd_args;
 1151         int error, name;
 1152 
 1153         if ((error = copyin(args, &linux_args, sizeof(linux_args))))
 1154                 return (error);
 1155 
 1156         bsd_args.s = linux_args.s;
 1157         bsd_args.level = linux_to_bsd_sockopt_level(linux_args.level);
 1158         switch (bsd_args.level) {
 1159         case SOL_SOCKET:
 1160                 name = linux_to_bsd_so_sockopt(linux_args.optname);
 1161                 break;
 1162         case IPPROTO_IP:
 1163                 name = linux_to_bsd_ip_sockopt(linux_args.optname);
 1164                 break;
 1165         case IPPROTO_TCP:
 1166                 /* Linux TCP option values match BSD's */
 1167                 name = linux_args.optname;
 1168                 break;
 1169         default:
 1170                 name = -1;
 1171                 break;
 1172         }
 1173         if (name == -1)
 1174                 return (EINVAL);
 1175 
 1176         bsd_args.name = name;
 1177         bsd_args.val = linux_args.optval;
 1178         bsd_args.avalsize = linux_args.optlen;
 1179         return (getsockopt(td, &bsd_args));
 1180 }
 1181 
 1182 int
 1183 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1184 {
 1185         void *arg = (void *)args->args;
 1186 
 1187         switch (args->what) {
 1188         case LINUX_SOCKET:
 1189                 return (linux_socket(td, arg));
 1190         case LINUX_BIND:
 1191                 return (linux_bind(td, arg));
 1192         case LINUX_CONNECT:
 1193                 return (linux_connect(td, arg));
 1194         case LINUX_LISTEN:
 1195                 return (linux_listen(td, arg));
 1196         case LINUX_ACCEPT:
 1197                 return (linux_accept(td, arg));
 1198         case LINUX_GETSOCKNAME:
 1199                 return (linux_getsockname(td, arg));
 1200         case LINUX_GETPEERNAME:
 1201                 return (linux_getpeername(td, arg));
 1202         case LINUX_SOCKETPAIR:
 1203                 return (linux_socketpair(td, arg));
 1204         case LINUX_SEND:
 1205                 return (linux_send(td, arg));
 1206         case LINUX_RECV:
 1207                 return (linux_recv(td, arg));
 1208         case LINUX_SENDTO:
 1209                 return (linux_sendto(td, arg));
 1210         case LINUX_RECVFROM:
 1211                 return (linux_recvfrom(td, arg));
 1212         case LINUX_SHUTDOWN:
 1213                 return (linux_shutdown(td, arg));
 1214         case LINUX_SETSOCKOPT:
 1215                 return (linux_setsockopt(td, arg));
 1216         case LINUX_GETSOCKOPT:
 1217                 return (linux_getsockopt(td, arg));
 1218         case LINUX_SENDMSG:
 1219                 return (linux_sendmsg(td, arg));
 1220         case LINUX_RECVMSG:
 1221                 return (linux_recvmsg(td, arg));
 1222         }
 1223 
 1224         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1225         return (ENOSYS);
 1226 }
 1227 #endif  /*!__alpha__*/

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