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 <netinet/in.h>
   55 #include <netinet/in_systm.h>
   56 #include <netinet/ip.h>
   57 #ifdef INET6
   58 #include <netinet/ip6.h>
   59 #include <netinet6/ip6_var.h>
   60 #endif
   61 
   62 #ifdef COMPAT_LINUX32
   63 #include <machine/../linux32/linux.h>
   64 #include <machine/../linux32/linux32_proto.h>
   65 #else
   66 #include <machine/../linux/linux.h>
   67 #include <machine/../linux/linux_proto.h>
   68 #endif
   69 #include <compat/linux/linux_socket.h>
   70 #include <compat/linux/linux_util.h>
   71 
   72 static int do_sa_get(struct sockaddr **, const struct osockaddr *, int *,
   73     struct malloc_type *);
   74 static int linux_to_bsd_domain(int);
   75 
   76 /*
   77  * Reads a linux sockaddr and does any necessary translation.
   78  * Linux sockaddrs don't have a length field, only a family.
   79  */
   80 static int
   81 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int len)
   82 {
   83         int osalen = len;
   84 
   85         return (do_sa_get(sap, osa, &osalen, M_SONAME));
   86 }
   87 
   88 /*
   89  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   90  * family and convert to sockaddr.
   91  */
   92 static int
   93 do_sa_get(struct sockaddr **sap, const struct osockaddr *osa, int *osalen,
   94     struct malloc_type *mtype)
   95 {
   96         int error=0, bdom;
   97         struct sockaddr *sa;
   98         struct osockaddr *kosa;
   99         int alloclen;
  100 #ifdef INET6
  101         int oldv6size;
  102         struct sockaddr_in6 *sin6;
  103 #endif
  104 
  105         if (*osalen < 2 || *osalen > UCHAR_MAX || !osa)
  106                 return (EINVAL);
  107 
  108         alloclen = *osalen;
  109 #ifdef INET6
  110         oldv6size = 0;
  111         /*
  112          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  113          * if it's a v4-mapped address, so reserve the proper space
  114          * for it.
  115          */
  116         if (alloclen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) {
  117                 alloclen = sizeof (struct sockaddr_in6);
  118                 oldv6size = 1;
  119         }
  120 #endif
  121 
  122         MALLOC(kosa, struct osockaddr *, alloclen, mtype, M_WAITOK);
  123 
  124         if ((error = copyin(osa, kosa, *osalen)))
  125                 goto out;
  126 
  127         bdom = linux_to_bsd_domain(kosa->sa_family);
  128         if (bdom == -1) {
  129                 error = EINVAL;
  130                 goto out;
  131         }
  132 
  133 #ifdef INET6
  134         /*
  135          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  136          * which lacks the scope id compared with RFC2553 one. If we detect
  137          * the situation, reject the address and write a message to system log.
  138          *
  139          * Still accept addresses for which the scope id is not used.
  140          */
  141         if (oldv6size && bdom == AF_INET6) {
  142                 sin6 = (struct sockaddr_in6 *)kosa;
  143                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  144                     (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  145                      !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  146                      !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  147                      !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  148                      !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  149                         sin6->sin6_scope_id = 0;
  150                 } else {
  151                         log(LOG_DEBUG,
  152                             "obsolete pre-RFC2553 sockaddr_in6 rejected\n");
  153                         error = EINVAL;
  154                         goto out;
  155                 }
  156         } else
  157 #endif
  158         if (bdom == AF_INET)
  159                 alloclen = sizeof(struct sockaddr_in);
  160 
  161         sa = (struct sockaddr *) kosa;
  162         sa->sa_family = bdom;
  163         sa->sa_len = alloclen;
  164 
  165         *sap = sa;
  166         *osalen = alloclen;
  167         return (0);
  168 
  169 out:
  170         FREE(kosa, mtype);
  171         return (error);
  172 }
  173 
  174 static int
  175 linux_to_bsd_domain(int domain)
  176 {
  177 
  178         switch (domain) {
  179         case LINUX_AF_UNSPEC:
  180                 return (AF_UNSPEC);
  181         case LINUX_AF_UNIX:
  182                 return (AF_LOCAL);
  183         case LINUX_AF_INET:
  184                 return (AF_INET);
  185         case LINUX_AF_INET6:
  186                 return (AF_INET6);
  187         case LINUX_AF_AX25:
  188                 return (AF_CCITT);
  189         case LINUX_AF_IPX:
  190                 return (AF_IPX);
  191         case LINUX_AF_APPLETALK:
  192                 return (AF_APPLETALK);
  193         }
  194         return (-1);
  195 }
  196 
  197 static int
  198 bsd_to_linux_domain(int domain)
  199 {
  200 
  201         switch (domain) {
  202         case AF_UNSPEC:
  203                 return (LINUX_AF_UNSPEC);
  204         case AF_LOCAL:
  205                 return (LINUX_AF_UNIX);
  206         case AF_INET:
  207                 return (LINUX_AF_INET);
  208         case AF_INET6:
  209                 return (LINUX_AF_INET6);
  210         case AF_CCITT:
  211                 return (LINUX_AF_AX25);
  212         case AF_IPX:
  213                 return (LINUX_AF_IPX);
  214         case AF_APPLETALK:
  215                 return (LINUX_AF_APPLETALK);
  216         }
  217         return (-1);
  218 }
  219 
  220 static int
  221 linux_to_bsd_sockopt_level(int level)
  222 {
  223 
  224         switch (level) {
  225         case LINUX_SOL_SOCKET:
  226                 return (SOL_SOCKET);
  227         }
  228         return (level);
  229 }
  230 
  231 static int
  232 bsd_to_linux_sockopt_level(int level)
  233 {
  234 
  235         switch (level) {
  236         case SOL_SOCKET:
  237                 return (LINUX_SOL_SOCKET);
  238         }
  239         return (level);
  240 }
  241 
  242 static int
  243 linux_to_bsd_ip_sockopt(int opt)
  244 {
  245 
  246         switch (opt) {
  247         case LINUX_IP_TOS:
  248                 return (IP_TOS);
  249         case LINUX_IP_TTL:
  250                 return (IP_TTL);
  251         case LINUX_IP_OPTIONS:
  252                 return (IP_OPTIONS);
  253         case LINUX_IP_MULTICAST_IF:
  254                 return (IP_MULTICAST_IF);
  255         case LINUX_IP_MULTICAST_TTL:
  256                 return (IP_MULTICAST_TTL);
  257         case LINUX_IP_MULTICAST_LOOP:
  258                 return (IP_MULTICAST_LOOP);
  259         case LINUX_IP_ADD_MEMBERSHIP:
  260                 return (IP_ADD_MEMBERSHIP);
  261         case LINUX_IP_DROP_MEMBERSHIP:
  262                 return (IP_DROP_MEMBERSHIP);
  263         case LINUX_IP_HDRINCL:
  264                 return (IP_HDRINCL);
  265         }
  266         return (-1);
  267 }
  268 
  269 static int
  270 linux_to_bsd_so_sockopt(int opt)
  271 {
  272 
  273         switch (opt) {
  274         case LINUX_SO_DEBUG:
  275                 return (SO_DEBUG);
  276         case LINUX_SO_REUSEADDR:
  277                 return (SO_REUSEADDR);
  278         case LINUX_SO_TYPE:
  279                 return (SO_TYPE);
  280         case LINUX_SO_ERROR:
  281                 return (SO_ERROR);
  282         case LINUX_SO_DONTROUTE:
  283                 return (SO_DONTROUTE);
  284         case LINUX_SO_BROADCAST:
  285                 return (SO_BROADCAST);
  286         case LINUX_SO_SNDBUF:
  287                 return (SO_SNDBUF);
  288         case LINUX_SO_RCVBUF:
  289                 return (SO_RCVBUF);
  290         case LINUX_SO_KEEPALIVE:
  291                 return (SO_KEEPALIVE);
  292         case LINUX_SO_OOBINLINE:
  293                 return (SO_OOBINLINE);
  294         case LINUX_SO_LINGER:
  295                 return (SO_LINGER);
  296         case LINUX_SO_PEERCRED:
  297                 return (LOCAL_PEERCRED);
  298         case LINUX_SO_RCVLOWAT:
  299                 return (SO_RCVLOWAT);
  300         case LINUX_SO_SNDLOWAT:
  301                 return (SO_SNDLOWAT);
  302         case LINUX_SO_RCVTIMEO:
  303                 return (SO_RCVTIMEO);
  304         case LINUX_SO_SNDTIMEO:
  305                 return (SO_SNDTIMEO);
  306         case LINUX_SO_TIMESTAMP:
  307                 return (SO_TIMESTAMP);
  308         case LINUX_SO_ACCEPTCONN:
  309                 return (SO_ACCEPTCONN);
  310         }
  311         return (-1);
  312 }
  313 
  314 static int
  315 linux_to_bsd_msg_flags(int flags)
  316 {
  317         int ret_flags = 0;
  318 
  319         if (flags & LINUX_MSG_OOB)
  320                 ret_flags |= MSG_OOB;
  321         if (flags & LINUX_MSG_PEEK)
  322                 ret_flags |= MSG_PEEK;
  323         if (flags & LINUX_MSG_DONTROUTE)
  324                 ret_flags |= MSG_DONTROUTE;
  325         if (flags & LINUX_MSG_CTRUNC)
  326                 ret_flags |= MSG_CTRUNC;
  327         if (flags & LINUX_MSG_TRUNC)
  328                 ret_flags |= MSG_TRUNC;
  329         if (flags & LINUX_MSG_DONTWAIT)
  330                 ret_flags |= MSG_DONTWAIT;
  331         if (flags & LINUX_MSG_EOR)
  332                 ret_flags |= MSG_EOR;
  333         if (flags & LINUX_MSG_WAITALL)
  334                 ret_flags |= MSG_WAITALL;
  335         if (flags & LINUX_MSG_NOSIGNAL)
  336                 ret_flags |= MSG_NOSIGNAL;
  337 #if 0 /* not handled */
  338         if (flags & LINUX_MSG_PROXY)
  339                 ;
  340         if (flags & LINUX_MSG_FIN)
  341                 ;
  342         if (flags & LINUX_MSG_SYN)
  343                 ;
  344         if (flags & LINUX_MSG_CONFIRM)
  345                 ;
  346         if (flags & LINUX_MSG_RST)
  347                 ;
  348         if (flags & LINUX_MSG_ERRQUEUE)
  349                 ;
  350 #endif
  351         return ret_flags;
  352 }
  353 
  354 /*
  355 * If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
  356 * native syscall will fault.  Thus, we don't really need to check the
  357 * return values for these functions.
  358 */
  359 
  360 static int
  361 bsd_to_linux_sockaddr(struct sockaddr *arg)
  362 {
  363         struct sockaddr sa;
  364         size_t sa_len = sizeof(struct sockaddr);
  365         int error;
  366         
  367         if ((error = copyin(arg, &sa, sa_len)))
  368                 return (error);
  369         
  370         *(u_short *)&sa = sa.sa_family;
  371         
  372         error = copyout(&sa, arg, sa_len);
  373         
  374         return (error);
  375 }
  376 
  377 static int
  378 linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
  379 {
  380         struct sockaddr sa;
  381         size_t sa_len = sizeof(struct sockaddr);
  382         int error;
  383 
  384         if ((error = copyin(arg, &sa, sa_len)))
  385                 return (error);
  386 
  387         sa.sa_family = *(sa_family_t *)&sa;
  388         sa.sa_len = len;
  389 
  390         error = copyout(&sa, arg, sa_len);
  391 
  392         return (error);
  393 }
  394 
  395 
  396 static int
  397 linux_sa_put(struct osockaddr *osa)
  398 {
  399         struct osockaddr sa;
  400         int error, bdom;
  401 
  402         /*
  403          * Only read/write the osockaddr family part, the rest is
  404          * not changed.
  405          */
  406         error = copyin(osa, &sa, sizeof(sa.sa_family));
  407         if (error)
  408                 return (error);
  409 
  410         bdom = bsd_to_linux_domain(sa.sa_family);
  411         if (bdom == -1)
  412                 return (EINVAL);
  413 
  414         sa.sa_family = bdom;
  415         error = copyout(&sa, osa, sizeof(sa.sa_family));
  416         if (error)
  417                 return (error);
  418 
  419         return (0);
  420 }
  421 
  422 static int
  423 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  424     enum uio_seg segflg)
  425 {
  426         struct mbuf *control;
  427         struct sockaddr *to;
  428         int error;
  429 
  430         if (mp->msg_name != NULL) {
  431                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  432                 if (error)
  433                         return (error);
  434                 mp->msg_name = to;
  435         } else
  436                 to = NULL;
  437 
  438         if (mp->msg_control != NULL) {
  439                 struct cmsghdr *cmsg;
  440 
  441                 if (mp->msg_controllen < sizeof(struct cmsghdr)) {
  442                         error = EINVAL;
  443                         goto bad;
  444                 }
  445                 error = sockargs(&control, mp->msg_control,
  446                     mp->msg_controllen, MT_CONTROL);
  447                 if (error)
  448                         goto bad;
  449 
  450                 cmsg = mtod(control, struct cmsghdr *);
  451                 cmsg->cmsg_level = linux_to_bsd_sockopt_level(cmsg->cmsg_level);
  452         } else
  453                 control = NULL;
  454 
  455         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  456             segflg);
  457 
  458 bad:
  459         if (to)
  460                 FREE(to, M_SONAME);
  461         return (error);
  462 }
  463 
  464 /* Return 0 if IP_HDRINCL is set for the given socket. */
  465 static int
  466 linux_check_hdrincl(struct thread *td, int s)
  467 {
  468         int error, optval, size_val;
  469 
  470         size_val = sizeof(optval);
  471         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  472             &optval, UIO_SYSSPACE, &size_val);
  473         if (error)
  474                 return (error);
  475 
  476         return (optval == 0);
  477 }
  478 
  479 struct linux_sendto_args {
  480         int s;
  481         l_uintptr_t msg;
  482         int len;
  483         int flags;
  484         l_uintptr_t to;
  485         int tolen;
  486 };
  487 
  488 /*
  489  * Updated sendto() when IP_HDRINCL is set:
  490  * tweak endian-dependent fields in the IP packet.
  491  */
  492 static int
  493 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  494 {
  495 /*
  496  * linux_ip_copysize defines how many bytes we should copy
  497  * from the beginning of the IP packet before we customize it for BSD.
  498  * It should include all the fields we modify (ip_len and ip_off).
  499  */
  500 #define linux_ip_copysize       8
  501 
  502         struct ip *packet;
  503         struct msghdr msg;
  504         struct iovec aiov[1];
  505         int error;
  506 
  507         /* Check that the packet isn't too big or too small. */
  508         if (linux_args->len < linux_ip_copysize ||
  509             linux_args->len > IP_MAXPACKET)
  510                 return (EINVAL);
  511 
  512         packet = (struct ip *)malloc(linux_args->len, M_TEMP, M_WAITOK);
  513 
  514         /* Make kernel copy of the packet to be sent */
  515         if ((error = copyin(PTRIN(linux_args->msg), packet,
  516             linux_args->len)))
  517                 goto goout;
  518 
  519         /* Convert fields from Linux to BSD raw IP socket format */
  520         packet->ip_len = linux_args->len;
  521         packet->ip_off = ntohs(packet->ip_off);
  522 
  523         /* Prepare the msghdr and iovec structures describing the new packet */
  524         msg.msg_name = PTRIN(linux_args->to);
  525         msg.msg_namelen = linux_args->tolen;
  526         msg.msg_iov = aiov;
  527         msg.msg_iovlen = 1;
  528         msg.msg_control = NULL;
  529         msg.msg_flags = 0;
  530         aiov[0].iov_base = (char *)packet;
  531         aiov[0].iov_len = linux_args->len;
  532         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  533             UIO_SYSSPACE);
  534 goout:
  535         free(packet, M_TEMP);
  536         return (error);
  537 }
  538 
  539 struct linux_socket_args {
  540         int domain;
  541         int type;
  542         int protocol;
  543 };
  544 
  545 static int
  546 linux_socket(struct thread *td, struct linux_socket_args *args)
  547 {
  548         struct socket_args /* {
  549                 int domain;
  550                 int type;
  551                 int protocol;
  552         } */ bsd_args;
  553         int retval_socket;
  554 
  555         bsd_args.protocol = args->protocol;
  556         bsd_args.type = args->type;
  557         bsd_args.domain = linux_to_bsd_domain(args->domain);
  558         if (bsd_args.domain == -1)
  559                 return (EINVAL);
  560 
  561         retval_socket = socket(td, &bsd_args);
  562         if (bsd_args.type == SOCK_RAW
  563             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  564             && bsd_args.domain == AF_INET
  565             && retval_socket >= 0) {
  566                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  567                 int hdrincl;
  568 
  569                 hdrincl = 1;
  570                 /* We ignore any error returned by kern_setsockopt() */
  571                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  572                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  573         }
  574 #ifdef INET6
  575         /*
  576          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by
  577          * default and some apps depend on this. So, set V6ONLY to 0
  578          * for Linux apps if the sysctl value is set to 1.
  579          */
  580         if (bsd_args.domain == PF_INET6 && retval_socket >= 0
  581 #ifndef KLD_MODULE
  582             /*
  583              * XXX: Avoid undefined symbol error with an IPv4 only
  584              * kernel.
  585              */
  586             && ip6_v6only
  587 #endif
  588             ) {
  589                 int v6only;
  590 
  591                 v6only = 0;
  592                 /* We ignore any error returned by setsockopt() */
  593                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  594                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  595         }
  596 #endif
  597 
  598         return (retval_socket);
  599 }
  600 
  601 struct linux_bind_args {
  602         int s;
  603         l_uintptr_t name;
  604         int namelen;
  605 };
  606 
  607 static int
  608 linux_bind(struct thread *td, struct linux_bind_args *args)
  609 {
  610         struct sockaddr *sa;
  611         int error;
  612 
  613         error = linux_getsockaddr(&sa, PTRIN(args->name),
  614             args->namelen);
  615         if (error)
  616                 return (error);
  617 
  618         error = kern_bind(td, args->s, sa);
  619         free(sa, M_SONAME);
  620         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  621                 return (EINVAL);
  622         return (error);
  623 }
  624 
  625 struct linux_connect_args {
  626         int s;
  627         l_uintptr_t name;
  628         int namelen;
  629 };
  630 int linux_connect(struct thread *, struct linux_connect_args *);
  631 
  632 int
  633 linux_connect(struct thread *td, struct linux_connect_args *args)
  634 {
  635         struct socket *so;
  636         struct sockaddr *sa;
  637         u_int fflag;
  638         int error;
  639 
  640         error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
  641             args->namelen);
  642         if (error)
  643                 return (error);
  644 
  645         error = kern_connect(td, args->s, sa);
  646         free(sa, M_SONAME);
  647         if (error != EISCONN)
  648                 return (error);
  649 
  650         /*
  651          * Linux doesn't return EISCONN the first time it occurs,
  652          * when on a non-blocking socket. Instead it returns the
  653          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  654          *
  655          * XXXRW: Instead of using fgetsock(), check that it is a
  656          * socket and use the file descriptor reference instead of
  657          * creating a new one.
  658          */
  659         error = fgetsock(td, args->s, &so, &fflag);
  660         if (error == 0) {
  661                 error = EISCONN;
  662                 if (fflag & FNONBLOCK) {
  663                         SOCK_LOCK(so);
  664                         if (so->so_emuldata == 0)
  665                                 error = so->so_error;
  666                         so->so_emuldata = (void *)1;
  667                         SOCK_UNLOCK(so);
  668                 }
  669                 fputsock(so);
  670         }
  671         return (error);
  672 }
  673 
  674 struct linux_listen_args {
  675         int s;
  676         int backlog;
  677 };
  678 
  679 static int
  680 linux_listen(struct thread *td, struct linux_listen_args *args)
  681 {
  682         struct listen_args /* {
  683                 int s;
  684                 int backlog;
  685         } */ bsd_args;
  686 
  687         bsd_args.s = args->s;
  688         bsd_args.backlog = args->backlog;
  689         return (listen(td, &bsd_args));
  690 }
  691 
  692 struct linux_accept_args {
  693         int s;
  694         l_uintptr_t addr;
  695         l_uintptr_t namelen;
  696 };
  697 
  698 static int
  699 linux_accept(struct thread *td, struct linux_accept_args *args)
  700 {
  701         struct accept_args /* {
  702                 int     s;
  703                 struct sockaddr * __restrict name;
  704                 socklen_t * __restrict anamelen;
  705         } */ bsd_args;
  706         int error, fd;
  707 
  708         bsd_args.s = args->s;
  709         /* XXX: */
  710         bsd_args.name = (struct sockaddr * __restrict)PTRIN(args->addr);
  711         bsd_args.anamelen = PTRIN(args->namelen);/* XXX */
  712         error = accept(td, &bsd_args);
  713         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
  714         if (error) {
  715                 if (error == EFAULT && args->namelen != sizeof(struct sockaddr_in))
  716                         return (EINVAL);
  717                 return (error);
  718         }
  719         if (args->addr) {
  720                 error = linux_sa_put(PTRIN(args->addr));
  721                 if (error) {
  722                         (void)kern_close(td, td->td_retval[0]);
  723                         return (error);
  724                 }
  725         }
  726 
  727         /*
  728          * linux appears not to copy flags from the parent socket to the
  729          * accepted one, so we must clear the flags in the new descriptor.
  730          * Ignore any errors, because we already have an open fd.
  731          */
  732         fd = td->td_retval[0];
  733         (void)kern_fcntl(td, fd, F_SETFL, 0);
  734         td->td_retval[0] = fd;
  735         return (0);
  736 }
  737 
  738 struct linux_getsockname_args {
  739         int s;
  740         l_uintptr_t addr;
  741         l_uintptr_t namelen;
  742 };
  743 
  744 static int
  745 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  746 {
  747         struct getsockname_args /* {
  748                 int     fdes;
  749                 struct sockaddr * __restrict asa;
  750                 socklen_t * __restrict alen;
  751         } */ bsd_args;
  752         int error;
  753 
  754         bsd_args.fdes = args->s;
  755         /* XXX: */
  756         bsd_args.asa = (struct sockaddr * __restrict)PTRIN(args->addr);
  757         bsd_args.alen = PTRIN(args->namelen);   /* XXX */
  758         error = getsockname(td, &bsd_args);
  759         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  760         if (error)
  761                 return (error);
  762         error = linux_sa_put(PTRIN(args->addr));
  763         if (error)
  764                 return (error);
  765         return (0);
  766 }
  767 
  768 struct linux_getpeername_args {
  769         int s;
  770         l_uintptr_t addr;
  771         l_uintptr_t namelen;
  772 };
  773 
  774 static int
  775 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  776 {
  777         struct getpeername_args /* {
  778                 int fdes;
  779                 caddr_t asa;
  780                 int *alen;
  781         } */ bsd_args;
  782         int error;
  783 
  784         bsd_args.fdes = args->s;
  785         bsd_args.asa = (struct sockaddr *)PTRIN(args->addr);
  786         bsd_args.alen = (int *)PTRIN(args->namelen);
  787         error = getpeername(td, &bsd_args);
  788         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  789         if (error)
  790                 return (error);
  791         error = linux_sa_put(PTRIN(args->addr));
  792         if (error)
  793                 return (error);
  794         return (0);
  795 }
  796 
  797 struct linux_socketpair_args {
  798         int domain;
  799         int type;
  800         int protocol;
  801         l_uintptr_t rsv;
  802 };
  803 
  804 static int
  805 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  806 {
  807         struct socketpair_args /* {
  808                 int domain;
  809                 int type;
  810                 int protocol;
  811                 int *rsv;
  812         } */ bsd_args;
  813 
  814         bsd_args.domain = linux_to_bsd_domain(args->domain);
  815         if (bsd_args.domain == -1)
  816                 return (EINVAL);
  817 
  818         bsd_args.type = args->type;
  819         bsd_args.protocol = args->protocol;
  820         bsd_args.rsv = (int *)PTRIN(args->rsv);
  821         return (socketpair(td, &bsd_args));
  822 }
  823 
  824 struct linux_send_args {
  825         int s;
  826         l_uintptr_t msg;
  827         int len;
  828         int flags;
  829 };
  830 
  831 static int
  832 linux_send(struct thread *td, struct linux_send_args *args)
  833 {
  834         struct sendto_args /* {
  835                 int s;
  836                 caddr_t buf;
  837                 int len;
  838                 int flags;
  839                 caddr_t to;
  840                 int tolen;
  841         } */ bsd_args;
  842 
  843         bsd_args.s = args->s;
  844         bsd_args.buf = (caddr_t)PTRIN(args->msg);
  845         bsd_args.len = args->len;
  846         bsd_args.flags = args->flags;
  847         bsd_args.to = NULL;
  848         bsd_args.tolen = 0;
  849         return sendto(td, &bsd_args);
  850 }
  851 
  852 struct linux_recv_args {
  853         int s;
  854         l_uintptr_t msg;
  855         int len;
  856         int flags;
  857 };
  858 
  859 static int
  860 linux_recv(struct thread *td, struct linux_recv_args *args)
  861 {
  862         struct recvfrom_args /* {
  863                 int s;
  864                 caddr_t buf;
  865                 int len;
  866                 int flags;
  867                 struct sockaddr *from;
  868                 socklen_t fromlenaddr;
  869         } */ bsd_args;
  870 
  871         bsd_args.s = args->s;
  872         bsd_args.buf = (caddr_t)PTRIN(args->msg);
  873         bsd_args.len = args->len;
  874         bsd_args.flags = args->flags;
  875         bsd_args.from = NULL;
  876         bsd_args.fromlenaddr = 0;
  877         return (recvfrom(td, &bsd_args));
  878 }
  879 
  880 static int
  881 linux_sendto(struct thread *td, struct linux_sendto_args *args)
  882 {
  883         struct msghdr msg;
  884         struct iovec aiov;
  885         int error;
  886 
  887         if (linux_check_hdrincl(td, args->s) == 0)
  888                 /* IP_HDRINCL set, tweak the packet before sending */
  889                 return (linux_sendto_hdrincl(td, args));
  890 
  891         msg.msg_name = PTRIN(args->to);
  892         msg.msg_namelen = args->tolen;
  893         msg.msg_iov = &aiov;
  894         msg.msg_iovlen = 1;
  895         msg.msg_control = NULL;
  896         msg.msg_flags = 0;
  897         aiov.iov_base = PTRIN(args->msg);
  898         aiov.iov_len = args->len;
  899         error = linux_sendit(td, args->s, &msg, args->flags, UIO_USERSPACE);
  900         return (error);
  901 }
  902 
  903 struct linux_recvfrom_args {
  904         int s;
  905         l_uintptr_t buf;
  906         int len;
  907         int flags;
  908         l_uintptr_t from;
  909         l_uintptr_t fromlen;
  910 };
  911 
  912 static int
  913 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
  914 {
  915         struct recvfrom_args /* {
  916                 int     s;
  917                 caddr_t buf;
  918                 size_t  len;
  919                 int     flags;
  920                 struct sockaddr * __restrict from;
  921                 socklen_t * __restrict fromlenaddr;
  922         } */ bsd_args;
  923         size_t len;
  924         int error;
  925 
  926         if ((error = copyin(PTRIN(args->fromlen), &len, sizeof(size_t))))
  927                 return (error);
  928 
  929         bsd_args.s = args->s;
  930         bsd_args.buf = PTRIN(args->buf);
  931         bsd_args.len = args->len;
  932         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
  933         /* XXX: */
  934         bsd_args.from = (struct sockaddr * __restrict)PTRIN(args->from);
  935         bsd_args.fromlenaddr = PTRIN(args->fromlen);/* XXX */
  936         
  937         linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.from, len);
  938         error = recvfrom(td, &bsd_args);
  939         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.from);
  940         
  941         if (error)
  942                 return (error);
  943         if (args->from) {
  944                 error = linux_sa_put((struct osockaddr *)
  945                     PTRIN(args->from));
  946                 if (error)
  947                         return (error);
  948         }
  949         return (0);
  950 }
  951 
  952 struct linux_sendmsg_args {
  953         int s;
  954         l_uintptr_t msg;
  955         int flags;
  956 };
  957 
  958 static int
  959 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
  960 {
  961         struct msghdr msg;
  962         struct iovec *iov;
  963         int error;
  964 
  965         /* XXXTJR sendmsg is broken on amd64 */
  966 
  967         error = copyin(PTRIN(args->msg), &msg, sizeof(msg));
  968         if (error)
  969                 return (error);
  970 
  971         /*
  972          * Some Linux applications (ping) define a non-NULL control data
  973          * pointer, but a msg_controllen of 0, which is not allowed in the
  974          * FreeBSD system call interface.  NULL the msg_control pointer in
  975          * order to handle this case.  This should be checked, but allows the
  976          * Linux ping to work.
  977          */
  978         if (msg.msg_control != NULL && msg.msg_controllen == 0)
  979                 msg.msg_control = NULL;
  980         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
  981         if (error)
  982                 return (error);
  983         msg.msg_iov = iov;
  984         msg.msg_flags = 0;
  985         error = linux_sendit(td, args->s, &msg, args->flags, UIO_USERSPACE);
  986         free(iov, M_IOV);
  987         return (error);
  988 }
  989 
  990 struct linux_recvmsg_args {
  991         int s;
  992         l_uintptr_t msg;
  993         int flags;
  994 };
  995 
  996 static int
  997 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
  998 {
  999         struct recvmsg_args /* {
 1000                 int     s;
 1001                 struct  msghdr *msg;
 1002                 int     flags;
 1003         } */ bsd_args;
 1004         struct msghdr msg;
 1005         struct cmsghdr *cmsg;
 1006         int error;
 1007 
 1008         /* XXXTJR recvmsg is broken on amd64 */
 1009 
 1010         if ((error = copyin(PTRIN(args->msg), &msg, sizeof (msg))))
 1011                 return (error);
 1012 
 1013         bsd_args.s = args->s;
 1014         bsd_args.msg = PTRIN(args->msg);
 1015         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1016         if (msg.msg_name) {
 1017                 linux_to_bsd_sockaddr((struct sockaddr *)msg.msg_name,
 1018                       msg.msg_namelen);
 1019                 error = recvmsg(td, &bsd_args);
 1020                 bsd_to_linux_sockaddr((struct sockaddr *)msg.msg_name);
 1021         } else
 1022                 error = recvmsg(td, &bsd_args);
 1023         if (error)
 1024                 return (error);
 1025 
 1026         if (bsd_args.msg->msg_control != NULL &&
 1027             bsd_args.msg->msg_controllen > 0) {
 1028                 cmsg = (struct cmsghdr*)bsd_args.msg->msg_control;
 1029                 cmsg->cmsg_level = bsd_to_linux_sockopt_level(cmsg->cmsg_level);
 1030         }
 1031 
 1032         error = copyin(PTRIN(args->msg), &msg, sizeof(msg));
 1033         if (error)
 1034                 return (error);
 1035         if (msg.msg_name && msg.msg_namelen > 2)
 1036                 error = linux_sa_put(msg.msg_name);
 1037         return (error);
 1038 }
 1039 
 1040 struct linux_shutdown_args {
 1041         int s;
 1042         int how;
 1043 };
 1044 
 1045 static int
 1046 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1047 {
 1048         struct shutdown_args /* {
 1049                 int s;
 1050                 int how;
 1051         } */ bsd_args;
 1052 
 1053         bsd_args.s = args->s;
 1054         bsd_args.how = args->how;
 1055         return (shutdown(td, &bsd_args));
 1056 }
 1057 
 1058 struct linux_setsockopt_args {
 1059         int s;
 1060         int level;
 1061         int optname;
 1062         l_uintptr_t optval;
 1063         int optlen;
 1064 };
 1065 
 1066 static int
 1067 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1068 {
 1069         struct setsockopt_args /* {
 1070                 int s;
 1071                 int level;
 1072                 int name;
 1073                 caddr_t val;
 1074                 int valsize;
 1075         } */ bsd_args;
 1076         int error, name;
 1077 
 1078         bsd_args.s = args->s;
 1079         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1080         switch (bsd_args.level) {
 1081         case SOL_SOCKET:
 1082                 name = linux_to_bsd_so_sockopt(args->optname);
 1083                 break;
 1084         case IPPROTO_IP:
 1085                 name = linux_to_bsd_ip_sockopt(args->optname);
 1086                 break;
 1087         case IPPROTO_TCP:
 1088                 /* Linux TCP option values match BSD's */
 1089                 name = args->optname;
 1090                 break;
 1091         default:
 1092                 name = -1;
 1093                 break;
 1094         }
 1095         if (name == -1)
 1096                 return (ENOPROTOOPT);
 1097 
 1098         bsd_args.name = name;
 1099         bsd_args.val = PTRIN(args->optval);
 1100         bsd_args.valsize = args->optlen;
 1101 
 1102         if (name == IPV6_NEXTHOP) {
 1103                 linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
 1104                         bsd_args.valsize);
 1105                 error = setsockopt(td, &bsd_args);
 1106                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1107         } else
 1108                 error = setsockopt(td, &bsd_args);
 1109 
 1110         return (error);
 1111 }
 1112 
 1113 struct linux_getsockopt_args {
 1114         int s;
 1115         int level;
 1116         int optname;
 1117         l_uintptr_t optval;
 1118         l_uintptr_t optlen;
 1119 };
 1120 
 1121 static int
 1122 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1123 {
 1124         struct getsockopt_args /* {
 1125                 int s;
 1126                 int level;
 1127                 int name;
 1128                 caddr_t val;
 1129                 int *avalsize;
 1130         } */ bsd_args;
 1131         int error, name;
 1132 
 1133         bsd_args.s = args->s;
 1134         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1135         switch (bsd_args.level) {
 1136         case SOL_SOCKET:
 1137                 name = linux_to_bsd_so_sockopt(args->optname);
 1138                 break;
 1139         case IPPROTO_IP:
 1140                 name = linux_to_bsd_ip_sockopt(args->optname);
 1141                 break;
 1142         case IPPROTO_TCP:
 1143                 /* Linux TCP option values match BSD's */
 1144                 name = args->optname;
 1145                 break;
 1146         default:
 1147                 name = -1;
 1148                 break;
 1149         }
 1150         if (name == -1)
 1151                 return (EINVAL);
 1152 
 1153         bsd_args.name = name;
 1154         bsd_args.val = PTRIN(args->optval);
 1155         bsd_args.avalsize = PTRIN(args->optlen);
 1156 
 1157         if (name == IPV6_NEXTHOP) {
 1158                 error = getsockopt(td, &bsd_args);
 1159                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1160         } else
 1161                 error = getsockopt(td, &bsd_args);
 1162 
 1163         return (error);
 1164 }
 1165 
 1166 int
 1167 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1168 {
 1169         void *arg = (void *)(intptr_t)args->args;
 1170 
 1171         switch (args->what) {
 1172         case LINUX_SOCKET:
 1173                 return (linux_socket(td, arg));
 1174         case LINUX_BIND:
 1175                 return (linux_bind(td, arg));
 1176         case LINUX_CONNECT:
 1177                 return (linux_connect(td, arg));
 1178         case LINUX_LISTEN:
 1179                 return (linux_listen(td, arg));
 1180         case LINUX_ACCEPT:
 1181                 return (linux_accept(td, arg));
 1182         case LINUX_GETSOCKNAME:
 1183                 return (linux_getsockname(td, arg));
 1184         case LINUX_GETPEERNAME:
 1185                 return (linux_getpeername(td, arg));
 1186         case LINUX_SOCKETPAIR:
 1187                 return (linux_socketpair(td, arg));
 1188         case LINUX_SEND:
 1189                 return (linux_send(td, arg));
 1190         case LINUX_RECV:
 1191                 return (linux_recv(td, arg));
 1192         case LINUX_SENDTO:
 1193                 return (linux_sendto(td, arg));
 1194         case LINUX_RECVFROM:
 1195                 return (linux_recvfrom(td, arg));
 1196         case LINUX_SHUTDOWN:
 1197                 return (linux_shutdown(td, arg));
 1198         case LINUX_SETSOCKOPT:
 1199                 return (linux_setsockopt(td, arg));
 1200         case LINUX_GETSOCKOPT:
 1201                 return (linux_getsockopt(td, arg));
 1202         case LINUX_SENDMSG:
 1203                 return (linux_sendmsg(td, arg));
 1204         case LINUX_RECVMSG:
 1205                 return (linux_recvmsg(td, arg));
 1206         }
 1207 
 1208         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1209         return (ENOSYS);
 1210 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_socket.c

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