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/9.0/sys/compat/linux/linux_socket.c 226231 2011-10-10 19:54:50Z jkim $");
   31 
   32 /* XXX we use functions that might not exist. */
   33 #include "opt_compat.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/proc.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/capability.h>
   41 #include <sys/fcntl.h>
   42 #include <sys/file.h>
   43 #include <sys/limits.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mutex.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/syscallsubr.h>
   51 #include <sys/uio.h>
   52 #include <sys/syslog.h>
   53 #include <sys/un.h>
   54 
   55 #include <net/if.h>
   56 #include <netinet/in.h>
   57 #include <netinet/in_systm.h>
   58 #include <netinet/ip.h>
   59 #ifdef INET6
   60 #include <netinet/ip6.h>
   61 #include <netinet6/ip6_var.h>
   62 #include <netinet6/in6_var.h>
   63 #endif
   64 
   65 #ifdef COMPAT_LINUX32
   66 #include <machine/../linux32/linux.h>
   67 #include <machine/../linux32/linux32_proto.h>
   68 #else
   69 #include <machine/../linux/linux.h>
   70 #include <machine/../linux/linux_proto.h>
   71 #endif
   72 #include <compat/linux/linux_socket.h>
   73 #include <compat/linux/linux_util.h>
   74 
   75 static int linux_to_bsd_domain(int);
   76 
   77 /*
   78  * Reads a linux sockaddr and does any necessary translation.
   79  * Linux sockaddrs don't have a length field, only a family.
   80  * Copy the osockaddr structure pointed to by osa to kernel, adjust
   81  * family and convert to sockaddr.
   82  */
   83 static int
   84 linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int salen)
   85 {
   86         struct sockaddr *sa;
   87         struct osockaddr *kosa;
   88 #ifdef INET6
   89         struct sockaddr_in6 *sin6;
   90         int oldv6size;
   91 #endif
   92         char *name;
   93         int bdom, error, hdrlen, namelen;
   94 
   95         if (salen < 2 || salen > UCHAR_MAX || !osa)
   96                 return (EINVAL);
   97 
   98 #ifdef INET6
   99         oldv6size = 0;
  100         /*
  101          * Check for old (pre-RFC2553) sockaddr_in6. We may accept it
  102          * if it's a v4-mapped address, so reserve the proper space
  103          * for it.
  104          */
  105         if (salen == sizeof(struct sockaddr_in6) - sizeof(uint32_t)) {
  106                 salen += sizeof(uint32_t);
  107                 oldv6size = 1;
  108         }
  109 #endif
  110 
  111         kosa = malloc(salen, M_SONAME, M_WAITOK);
  112 
  113         if ((error = copyin(osa, kosa, salen)))
  114                 goto out;
  115 
  116         bdom = linux_to_bsd_domain(kosa->sa_family);
  117         if (bdom == -1) {
  118                 error = EAFNOSUPPORT;
  119                 goto out;
  120         }
  121 
  122 #ifdef INET6
  123         /*
  124          * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
  125          * which lacks the scope id compared with RFC2553 one. If we detect
  126          * the situation, reject the address and write a message to system log.
  127          *
  128          * Still accept addresses for which the scope id is not used.
  129          */
  130         if (oldv6size) {
  131                 if (bdom == AF_INET6) {
  132                         sin6 = (struct sockaddr_in6 *)kosa;
  133                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
  134                             (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  135                              !IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  136                              !IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
  137                              !IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
  138                              !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
  139                                 sin6->sin6_scope_id = 0;
  140                         } else {
  141                                 log(LOG_DEBUG,
  142                                     "obsolete pre-RFC2553 sockaddr_in6 rejected\n");
  143                                 error = EINVAL;
  144                                 goto out;
  145                         }
  146                 } else
  147                         salen -= sizeof(uint32_t);
  148         }
  149 #endif
  150         if (bdom == AF_INET) {
  151                 if (salen < sizeof(struct sockaddr_in)) {
  152                         error = EINVAL;
  153                         goto out;
  154                 }
  155                 salen = sizeof(struct sockaddr_in);
  156         }
  157 
  158         if (bdom == AF_LOCAL && salen > sizeof(struct sockaddr_un)) {
  159                 hdrlen = offsetof(struct sockaddr_un, sun_path);
  160                 name = ((struct sockaddr_un *)kosa)->sun_path;
  161                 if (*name == '\0') {
  162                         /*
  163                          * Linux abstract namespace starts with a NULL byte.
  164                          * XXX We do not support abstract namespace yet.
  165                          */
  166                         namelen = strnlen(name + 1, salen - hdrlen - 1) + 1;
  167                 } else
  168                         namelen = strnlen(name, salen - hdrlen);
  169                 salen = hdrlen + namelen;
  170                 if (salen > sizeof(struct sockaddr_un)) {
  171                         error = ENAMETOOLONG;
  172                         goto out;
  173                 }
  174         }
  175 
  176         sa = (struct sockaddr *)kosa;
  177         sa->sa_family = bdom;
  178         sa->sa_len = salen;
  179 
  180         *sap = sa;
  181         return (0);
  182 
  183 out:
  184         free(kosa, M_SONAME);
  185         return (error);
  186 }
  187 
  188 static int
  189 linux_to_bsd_domain(int domain)
  190 {
  191 
  192         switch (domain) {
  193         case LINUX_AF_UNSPEC:
  194                 return (AF_UNSPEC);
  195         case LINUX_AF_UNIX:
  196                 return (AF_LOCAL);
  197         case LINUX_AF_INET:
  198                 return (AF_INET);
  199         case LINUX_AF_INET6:
  200                 return (AF_INET6);
  201         case LINUX_AF_AX25:
  202                 return (AF_CCITT);
  203         case LINUX_AF_IPX:
  204                 return (AF_IPX);
  205         case LINUX_AF_APPLETALK:
  206                 return (AF_APPLETALK);
  207         }
  208         return (-1);
  209 }
  210 
  211 static int
  212 bsd_to_linux_domain(int domain)
  213 {
  214 
  215         switch (domain) {
  216         case AF_UNSPEC:
  217                 return (LINUX_AF_UNSPEC);
  218         case AF_LOCAL:
  219                 return (LINUX_AF_UNIX);
  220         case AF_INET:
  221                 return (LINUX_AF_INET);
  222         case AF_INET6:
  223                 return (LINUX_AF_INET6);
  224         case AF_CCITT:
  225                 return (LINUX_AF_AX25);
  226         case AF_IPX:
  227                 return (LINUX_AF_IPX);
  228         case AF_APPLETALK:
  229                 return (LINUX_AF_APPLETALK);
  230         }
  231         return (-1);
  232 }
  233 
  234 static int
  235 linux_to_bsd_sockopt_level(int level)
  236 {
  237 
  238         switch (level) {
  239         case LINUX_SOL_SOCKET:
  240                 return (SOL_SOCKET);
  241         }
  242         return (level);
  243 }
  244 
  245 static int
  246 bsd_to_linux_sockopt_level(int level)
  247 {
  248 
  249         switch (level) {
  250         case SOL_SOCKET:
  251                 return (LINUX_SOL_SOCKET);
  252         }
  253         return (level);
  254 }
  255 
  256 static int
  257 linux_to_bsd_ip_sockopt(int opt)
  258 {
  259 
  260         switch (opt) {
  261         case LINUX_IP_TOS:
  262                 return (IP_TOS);
  263         case LINUX_IP_TTL:
  264                 return (IP_TTL);
  265         case LINUX_IP_OPTIONS:
  266                 return (IP_OPTIONS);
  267         case LINUX_IP_MULTICAST_IF:
  268                 return (IP_MULTICAST_IF);
  269         case LINUX_IP_MULTICAST_TTL:
  270                 return (IP_MULTICAST_TTL);
  271         case LINUX_IP_MULTICAST_LOOP:
  272                 return (IP_MULTICAST_LOOP);
  273         case LINUX_IP_ADD_MEMBERSHIP:
  274                 return (IP_ADD_MEMBERSHIP);
  275         case LINUX_IP_DROP_MEMBERSHIP:
  276                 return (IP_DROP_MEMBERSHIP);
  277         case LINUX_IP_HDRINCL:
  278                 return (IP_HDRINCL);
  279         }
  280         return (-1);
  281 }
  282 
  283 static int
  284 linux_to_bsd_so_sockopt(int opt)
  285 {
  286 
  287         switch (opt) {
  288         case LINUX_SO_DEBUG:
  289                 return (SO_DEBUG);
  290         case LINUX_SO_REUSEADDR:
  291                 return (SO_REUSEADDR);
  292         case LINUX_SO_TYPE:
  293                 return (SO_TYPE);
  294         case LINUX_SO_ERROR:
  295                 return (SO_ERROR);
  296         case LINUX_SO_DONTROUTE:
  297                 return (SO_DONTROUTE);
  298         case LINUX_SO_BROADCAST:
  299                 return (SO_BROADCAST);
  300         case LINUX_SO_SNDBUF:
  301                 return (SO_SNDBUF);
  302         case LINUX_SO_RCVBUF:
  303                 return (SO_RCVBUF);
  304         case LINUX_SO_KEEPALIVE:
  305                 return (SO_KEEPALIVE);
  306         case LINUX_SO_OOBINLINE:
  307                 return (SO_OOBINLINE);
  308         case LINUX_SO_LINGER:
  309                 return (SO_LINGER);
  310         case LINUX_SO_PEERCRED:
  311                 return (LOCAL_PEERCRED);
  312         case LINUX_SO_RCVLOWAT:
  313                 return (SO_RCVLOWAT);
  314         case LINUX_SO_SNDLOWAT:
  315                 return (SO_SNDLOWAT);
  316         case LINUX_SO_RCVTIMEO:
  317                 return (SO_RCVTIMEO);
  318         case LINUX_SO_SNDTIMEO:
  319                 return (SO_SNDTIMEO);
  320         case LINUX_SO_TIMESTAMP:
  321                 return (SO_TIMESTAMP);
  322         case LINUX_SO_ACCEPTCONN:
  323                 return (SO_ACCEPTCONN);
  324         }
  325         return (-1);
  326 }
  327 
  328 static int
  329 linux_to_bsd_msg_flags(int flags)
  330 {
  331         int ret_flags = 0;
  332 
  333         if (flags & LINUX_MSG_OOB)
  334                 ret_flags |= MSG_OOB;
  335         if (flags & LINUX_MSG_PEEK)
  336                 ret_flags |= MSG_PEEK;
  337         if (flags & LINUX_MSG_DONTROUTE)
  338                 ret_flags |= MSG_DONTROUTE;
  339         if (flags & LINUX_MSG_CTRUNC)
  340                 ret_flags |= MSG_CTRUNC;
  341         if (flags & LINUX_MSG_TRUNC)
  342                 ret_flags |= MSG_TRUNC;
  343         if (flags & LINUX_MSG_DONTWAIT)
  344                 ret_flags |= MSG_DONTWAIT;
  345         if (flags & LINUX_MSG_EOR)
  346                 ret_flags |= MSG_EOR;
  347         if (flags & LINUX_MSG_WAITALL)
  348                 ret_flags |= MSG_WAITALL;
  349         if (flags & LINUX_MSG_NOSIGNAL)
  350                 ret_flags |= MSG_NOSIGNAL;
  351 #if 0 /* not handled */
  352         if (flags & LINUX_MSG_PROXY)
  353                 ;
  354         if (flags & LINUX_MSG_FIN)
  355                 ;
  356         if (flags & LINUX_MSG_SYN)
  357                 ;
  358         if (flags & LINUX_MSG_CONFIRM)
  359                 ;
  360         if (flags & LINUX_MSG_RST)
  361                 ;
  362         if (flags & LINUX_MSG_ERRQUEUE)
  363                 ;
  364 #endif
  365         return ret_flags;
  366 }
  367 
  368 /*
  369 * If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
  370 * native syscall will fault.  Thus, we don't really need to check the
  371 * return values for these functions.
  372 */
  373 
  374 static int
  375 bsd_to_linux_sockaddr(struct sockaddr *arg)
  376 {
  377         struct sockaddr sa;
  378         size_t sa_len = sizeof(struct sockaddr);
  379         int error;
  380         
  381         if ((error = copyin(arg, &sa, sa_len)))
  382                 return (error);
  383         
  384         *(u_short *)&sa = sa.sa_family;
  385         
  386         error = copyout(&sa, arg, sa_len);
  387         
  388         return (error);
  389 }
  390 
  391 static int
  392 linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
  393 {
  394         struct sockaddr sa;
  395         size_t sa_len = sizeof(struct sockaddr);
  396         int error;
  397 
  398         if ((error = copyin(arg, &sa, sa_len)))
  399                 return (error);
  400 
  401         sa.sa_family = *(sa_family_t *)&sa;
  402         sa.sa_len = len;
  403 
  404         error = copyout(&sa, arg, sa_len);
  405 
  406         return (error);
  407 }
  408 
  409 
  410 static int
  411 linux_sa_put(struct osockaddr *osa)
  412 {
  413         struct osockaddr sa;
  414         int error, bdom;
  415 
  416         /*
  417          * Only read/write the osockaddr family part, the rest is
  418          * not changed.
  419          */
  420         error = copyin(osa, &sa, sizeof(sa.sa_family));
  421         if (error)
  422                 return (error);
  423 
  424         bdom = bsd_to_linux_domain(sa.sa_family);
  425         if (bdom == -1)
  426                 return (EINVAL);
  427 
  428         sa.sa_family = bdom;
  429         error = copyout(&sa, osa, sizeof(sa.sa_family));
  430         if (error)
  431                 return (error);
  432 
  433         return (0);
  434 }
  435 
  436 static int
  437 linux_to_bsd_cmsg_type(int cmsg_type)
  438 {
  439 
  440         switch (cmsg_type) {
  441         case LINUX_SCM_RIGHTS:
  442                 return (SCM_RIGHTS);
  443         case LINUX_SCM_CREDENTIALS:
  444                 return (SCM_CREDS);
  445         }
  446         return (-1);
  447 }
  448 
  449 static int
  450 bsd_to_linux_cmsg_type(int cmsg_type)
  451 {
  452 
  453         switch (cmsg_type) {
  454         case SCM_RIGHTS:
  455                 return (LINUX_SCM_RIGHTS);
  456         case SCM_CREDS:
  457                 return (LINUX_SCM_CREDENTIALS);
  458         }
  459         return (-1);
  460 }
  461 
  462 static int
  463 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
  464 {
  465         if (lhdr->msg_controllen > INT_MAX)
  466                 return (ENOBUFS);
  467 
  468         bhdr->msg_name          = PTRIN(lhdr->msg_name);
  469         bhdr->msg_namelen       = lhdr->msg_namelen;
  470         bhdr->msg_iov           = PTRIN(lhdr->msg_iov);
  471         bhdr->msg_iovlen        = lhdr->msg_iovlen;
  472         bhdr->msg_control       = PTRIN(lhdr->msg_control);
  473 
  474         /*
  475          * msg_controllen is skipped since BSD and LINUX control messages
  476          * are potentially different sizes (e.g. the cred structure used
  477          * by SCM_CREDS is different between the two operating system).
  478          *
  479          * The caller can set it (if necessary) after converting all the
  480          * control messages.
  481          */
  482 
  483         bhdr->msg_flags         = linux_to_bsd_msg_flags(lhdr->msg_flags);
  484         return (0);
  485 }
  486 
  487 static int
  488 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
  489 {
  490         lhdr->msg_name          = PTROUT(bhdr->msg_name);
  491         lhdr->msg_namelen       = bhdr->msg_namelen;
  492         lhdr->msg_iov           = PTROUT(bhdr->msg_iov);
  493         lhdr->msg_iovlen        = bhdr->msg_iovlen;
  494         lhdr->msg_control       = PTROUT(bhdr->msg_control);
  495 
  496         /*
  497          * msg_controllen is skipped since BSD and LINUX control messages
  498          * are potentially different sizes (e.g. the cred structure used
  499          * by SCM_CREDS is different between the two operating system).
  500          *
  501          * The caller can set it (if necessary) after converting all the
  502          * control messages.
  503          */
  504 
  505         /* msg_flags skipped */
  506         return (0);
  507 }
  508 
  509 static int
  510 linux_set_socket_flags(struct thread *td, int s, int flags)
  511 {
  512         int error;
  513 
  514         if (flags & LINUX_SOCK_NONBLOCK) {
  515                 error = kern_fcntl(td, s, F_SETFL, O_NONBLOCK);
  516                 if (error)
  517                         return (error);
  518         }
  519         if (flags & LINUX_SOCK_CLOEXEC) {
  520                 error = kern_fcntl(td, s, F_SETFD, FD_CLOEXEC);
  521                 if (error)
  522                         return (error);
  523         }
  524         return (0);
  525 }
  526 
  527 static int
  528 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  529     struct mbuf *control, enum uio_seg segflg)
  530 {
  531         struct sockaddr *to;
  532         int error;
  533 
  534         if (mp->msg_name != NULL) {
  535                 error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
  536                 if (error)
  537                         return (error);
  538                 mp->msg_name = to;
  539         } else
  540                 to = NULL;
  541 
  542         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  543             segflg);
  544 
  545         if (to)
  546                 free(to, M_SONAME);
  547         return (error);
  548 }
  549 
  550 /* Return 0 if IP_HDRINCL is set for the given socket. */
  551 static int
  552 linux_check_hdrincl(struct thread *td, int s)
  553 {
  554         int error, optval, size_val;
  555 
  556         size_val = sizeof(optval);
  557         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  558             &optval, UIO_SYSSPACE, &size_val);
  559         if (error)
  560                 return (error);
  561 
  562         return (optval == 0);
  563 }
  564 
  565 struct linux_sendto_args {
  566         int s;
  567         l_uintptr_t msg;
  568         int len;
  569         int flags;
  570         l_uintptr_t to;
  571         int tolen;
  572 };
  573 
  574 /*
  575  * Updated sendto() when IP_HDRINCL is set:
  576  * tweak endian-dependent fields in the IP packet.
  577  */
  578 static int
  579 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  580 {
  581 /*
  582  * linux_ip_copysize defines how many bytes we should copy
  583  * from the beginning of the IP packet before we customize it for BSD.
  584  * It should include all the fields we modify (ip_len and ip_off).
  585  */
  586 #define linux_ip_copysize       8
  587 
  588         struct ip *packet;
  589         struct msghdr msg;
  590         struct iovec aiov[1];
  591         int error;
  592 
  593         /* Check that the packet isn't too big or too small. */
  594         if (linux_args->len < linux_ip_copysize ||
  595             linux_args->len > IP_MAXPACKET)
  596                 return (EINVAL);
  597 
  598         packet = (struct ip *)malloc(linux_args->len, M_TEMP, M_WAITOK);
  599 
  600         /* Make kernel copy of the packet to be sent */
  601         if ((error = copyin(PTRIN(linux_args->msg), packet,
  602             linux_args->len)))
  603                 goto goout;
  604 
  605         /* Convert fields from Linux to BSD raw IP socket format */
  606         packet->ip_len = linux_args->len;
  607         packet->ip_off = ntohs(packet->ip_off);
  608 
  609         /* Prepare the msghdr and iovec structures describing the new packet */
  610         msg.msg_name = PTRIN(linux_args->to);
  611         msg.msg_namelen = linux_args->tolen;
  612         msg.msg_iov = aiov;
  613         msg.msg_iovlen = 1;
  614         msg.msg_control = NULL;
  615         msg.msg_flags = 0;
  616         aiov[0].iov_base = (char *)packet;
  617         aiov[0].iov_len = linux_args->len;
  618         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  619             NULL, UIO_SYSSPACE);
  620 goout:
  621         free(packet, M_TEMP);
  622         return (error);
  623 }
  624 
  625 struct linux_socket_args {
  626         int domain;
  627         int type;
  628         int protocol;
  629 };
  630 
  631 static int
  632 linux_socket(struct thread *td, struct linux_socket_args *args)
  633 {
  634         struct socket_args /* {
  635                 int domain;
  636                 int type;
  637                 int protocol;
  638         } */ bsd_args;
  639         int retval_socket, socket_flags;
  640 
  641         bsd_args.protocol = args->protocol;
  642         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  643         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  644                 return (EINVAL);
  645         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  646         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  647                 return (EINVAL);
  648         bsd_args.domain = linux_to_bsd_domain(args->domain);
  649         if (bsd_args.domain == -1)
  650                 return (EAFNOSUPPORT);
  651 
  652         retval_socket = sys_socket(td, &bsd_args);
  653         if (retval_socket)
  654                 return (retval_socket);
  655 
  656         retval_socket = linux_set_socket_flags(td, td->td_retval[0],
  657             socket_flags);
  658         if (retval_socket) {
  659                 (void)kern_close(td, td->td_retval[0]);
  660                 goto out;
  661         }
  662 
  663         if (bsd_args.type == SOCK_RAW
  664             && (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
  665             && bsd_args.domain == PF_INET) {
  666                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  667                 int hdrincl;
  668 
  669                 hdrincl = 1;
  670                 /* We ignore any error returned by kern_setsockopt() */
  671                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  672                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  673         }
  674 #ifdef INET6
  675         /*
  676          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
  677          * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
  678          * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
  679          * sysctl value.
  680          */
  681         if (bsd_args.domain == PF_INET6) {
  682                 int v6only;
  683 
  684                 v6only = 0;
  685                 /* We ignore any error returned by setsockopt() */
  686                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  687                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  688         }
  689 #endif
  690 
  691 out:
  692         return (retval_socket);
  693 }
  694 
  695 struct linux_bind_args {
  696         int s;
  697         l_uintptr_t name;
  698         int namelen;
  699 };
  700 
  701 static int
  702 linux_bind(struct thread *td, struct linux_bind_args *args)
  703 {
  704         struct sockaddr *sa;
  705         int error;
  706 
  707         error = linux_getsockaddr(&sa, PTRIN(args->name),
  708             args->namelen);
  709         if (error)
  710                 return (error);
  711 
  712         error = kern_bind(td, args->s, sa);
  713         free(sa, M_SONAME);
  714         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  715                 return (EINVAL);
  716         return (error);
  717 }
  718 
  719 struct linux_connect_args {
  720         int s;
  721         l_uintptr_t name;
  722         int namelen;
  723 };
  724 int linux_connect(struct thread *, struct linux_connect_args *);
  725 
  726 int
  727 linux_connect(struct thread *td, struct linux_connect_args *args)
  728 {
  729         struct socket *so;
  730         struct sockaddr *sa;
  731         u_int fflag;
  732         int error;
  733 
  734         error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
  735             args->namelen);
  736         if (error)
  737                 return (error);
  738 
  739         error = kern_connect(td, args->s, sa);
  740         free(sa, M_SONAME);
  741         if (error != EISCONN)
  742                 return (error);
  743 
  744         /*
  745          * Linux doesn't return EISCONN the first time it occurs,
  746          * when on a non-blocking socket. Instead it returns the
  747          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  748          *
  749          * XXXRW: Instead of using fgetsock(), check that it is a
  750          * socket and use the file descriptor reference instead of
  751          * creating a new one.
  752          */
  753         error = fgetsock(td, args->s, CAP_CONNECT, &so, &fflag);
  754         if (error == 0) {
  755                 error = EISCONN;
  756                 if (fflag & FNONBLOCK) {
  757                         SOCK_LOCK(so);
  758                         if (so->so_emuldata == 0)
  759                                 error = so->so_error;
  760                         so->so_emuldata = (void *)1;
  761                         SOCK_UNLOCK(so);
  762                 }
  763                 fputsock(so);
  764         }
  765         return (error);
  766 }
  767 
  768 struct linux_listen_args {
  769         int s;
  770         int backlog;
  771 };
  772 
  773 static int
  774 linux_listen(struct thread *td, struct linux_listen_args *args)
  775 {
  776         struct listen_args /* {
  777                 int s;
  778                 int backlog;
  779         } */ bsd_args;
  780 
  781         bsd_args.s = args->s;
  782         bsd_args.backlog = args->backlog;
  783         return (sys_listen(td, &bsd_args));
  784 }
  785 
  786 static int
  787 linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
  788     l_uintptr_t namelen, int flags)
  789 {
  790         struct accept_args /* {
  791                 int     s;
  792                 struct sockaddr * __restrict name;
  793                 socklen_t * __restrict anamelen;
  794         } */ bsd_args;
  795         int error;
  796 
  797         if (flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  798                 return (EINVAL);
  799 
  800         bsd_args.s = s;
  801         /* XXX: */
  802         bsd_args.name = (struct sockaddr * __restrict)PTRIN(addr);
  803         bsd_args.anamelen = PTRIN(namelen);/* XXX */
  804         error = sys_accept(td, &bsd_args);
  805         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
  806         if (error) {
  807                 if (error == EFAULT && namelen != sizeof(struct sockaddr_in))
  808                         return (EINVAL);
  809                 return (error);
  810         }
  811 
  812         /*
  813          * linux appears not to copy flags from the parent socket to the
  814          * accepted one, so we must clear the flags in the new descriptor
  815          * and apply the requested flags.
  816          */
  817         error = kern_fcntl(td, td->td_retval[0], F_SETFL, 0);
  818         if (error)
  819                 goto out;
  820         error = linux_set_socket_flags(td, td->td_retval[0], flags);
  821         if (error)
  822                 goto out;
  823         if (addr)
  824                 error = linux_sa_put(PTRIN(addr));
  825 
  826 out:
  827         if (error) {
  828                 (void)kern_close(td, td->td_retval[0]);
  829                 td->td_retval[0] = 0;
  830         }
  831         return (error);
  832 }
  833 
  834 struct linux_accept_args {
  835         int s;
  836         l_uintptr_t addr;
  837         l_uintptr_t namelen;
  838 };
  839 
  840 static int
  841 linux_accept(struct thread *td, struct linux_accept_args *args)
  842 {
  843 
  844         return (linux_accept_common(td, args->s, args->addr,
  845             args->namelen, 0));
  846 }
  847 
  848 struct linux_accept4_args {
  849         int s;
  850         l_uintptr_t addr;
  851         l_uintptr_t namelen;
  852         int flags;
  853 };
  854 
  855 static int
  856 linux_accept4(struct thread *td, struct linux_accept4_args *args)
  857 {
  858 
  859         return (linux_accept_common(td, args->s, args->addr,
  860             args->namelen, args->flags));
  861 }
  862 
  863 struct linux_getsockname_args {
  864         int s;
  865         l_uintptr_t addr;
  866         l_uintptr_t namelen;
  867 };
  868 
  869 static int
  870 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
  871 {
  872         struct getsockname_args /* {
  873                 int     fdes;
  874                 struct sockaddr * __restrict asa;
  875                 socklen_t * __restrict alen;
  876         } */ bsd_args;
  877         int error;
  878 
  879         bsd_args.fdes = args->s;
  880         /* XXX: */
  881         bsd_args.asa = (struct sockaddr * __restrict)PTRIN(args->addr);
  882         bsd_args.alen = PTRIN(args->namelen);   /* XXX */
  883         error = sys_getsockname(td, &bsd_args);
  884         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  885         if (error)
  886                 return (error);
  887         error = linux_sa_put(PTRIN(args->addr));
  888         if (error)
  889                 return (error);
  890         return (0);
  891 }
  892 
  893 struct linux_getpeername_args {
  894         int s;
  895         l_uintptr_t addr;
  896         l_uintptr_t namelen;
  897 };
  898 
  899 static int
  900 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
  901 {
  902         struct getpeername_args /* {
  903                 int fdes;
  904                 caddr_t asa;
  905                 int *alen;
  906         } */ bsd_args;
  907         int error;
  908 
  909         bsd_args.fdes = args->s;
  910         bsd_args.asa = (struct sockaddr *)PTRIN(args->addr);
  911         bsd_args.alen = (int *)PTRIN(args->namelen);
  912         error = sys_getpeername(td, &bsd_args);
  913         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
  914         if (error)
  915                 return (error);
  916         error = linux_sa_put(PTRIN(args->addr));
  917         if (error)
  918                 return (error);
  919         return (0);
  920 }
  921 
  922 struct linux_socketpair_args {
  923         int domain;
  924         int type;
  925         int protocol;
  926         l_uintptr_t rsv;
  927 };
  928 
  929 static int
  930 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
  931 {
  932         struct socketpair_args /* {
  933                 int domain;
  934                 int type;
  935                 int protocol;
  936                 int *rsv;
  937         } */ bsd_args;
  938         int error, socket_flags;
  939         int sv[2];
  940 
  941         bsd_args.domain = linux_to_bsd_domain(args->domain);
  942         if (bsd_args.domain != PF_LOCAL)
  943                 return (EAFNOSUPPORT);
  944 
  945         socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
  946         if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  947                 return (EINVAL);
  948         bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
  949         if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
  950                 return (EINVAL);
  951 
  952         if (args->protocol != 0 && args->protocol != PF_UNIX)
  953 
  954                 /*
  955                  * Use of PF_UNIX as protocol argument is not right,
  956                  * but Linux does it.
  957                  * Do not map PF_UNIX as its Linux value is identical
  958                  * to FreeBSD one.
  959                  */
  960                 return (EPROTONOSUPPORT);
  961         else
  962                 bsd_args.protocol = 0;
  963         bsd_args.rsv = (int *)PTRIN(args->rsv);
  964         error = kern_socketpair(td, bsd_args.domain, bsd_args.type,
  965             bsd_args.protocol, sv);
  966         if (error)
  967                 return (error);
  968         error = linux_set_socket_flags(td, sv[0], socket_flags);
  969         if (error)
  970                 goto out;
  971         error = linux_set_socket_flags(td, sv[1], socket_flags);
  972         if (error)
  973                 goto out;
  974 
  975         error = copyout(sv, bsd_args.rsv, 2 * sizeof(int));
  976 
  977 out:
  978         if (error) {
  979                 (void)kern_close(td, sv[0]);
  980                 (void)kern_close(td, sv[1]);
  981         }
  982         return (error);
  983 }
  984 
  985 struct linux_send_args {
  986         int s;
  987         l_uintptr_t msg;
  988         int len;
  989         int flags;
  990 };
  991 
  992 static int
  993 linux_send(struct thread *td, struct linux_send_args *args)
  994 {
  995         struct sendto_args /* {
  996                 int s;
  997                 caddr_t buf;
  998                 int len;
  999                 int flags;
 1000                 caddr_t to;
 1001                 int tolen;
 1002         } */ bsd_args;
 1003 
 1004         bsd_args.s = args->s;
 1005         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1006         bsd_args.len = args->len;
 1007         bsd_args.flags = args->flags;
 1008         bsd_args.to = NULL;
 1009         bsd_args.tolen = 0;
 1010         return sys_sendto(td, &bsd_args);
 1011 }
 1012 
 1013 struct linux_recv_args {
 1014         int s;
 1015         l_uintptr_t msg;
 1016         int len;
 1017         int flags;
 1018 };
 1019 
 1020 static int
 1021 linux_recv(struct thread *td, struct linux_recv_args *args)
 1022 {
 1023         struct recvfrom_args /* {
 1024                 int s;
 1025                 caddr_t buf;
 1026                 int len;
 1027                 int flags;
 1028                 struct sockaddr *from;
 1029                 socklen_t fromlenaddr;
 1030         } */ bsd_args;
 1031 
 1032         bsd_args.s = args->s;
 1033         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1034         bsd_args.len = args->len;
 1035         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1036         bsd_args.from = NULL;
 1037         bsd_args.fromlenaddr = 0;
 1038         return (sys_recvfrom(td, &bsd_args));
 1039 }
 1040 
 1041 static int
 1042 linux_sendto(struct thread *td, struct linux_sendto_args *args)
 1043 {
 1044         struct msghdr msg;
 1045         struct iovec aiov;
 1046         int error;
 1047 
 1048         if (linux_check_hdrincl(td, args->s) == 0)
 1049                 /* IP_HDRINCL set, tweak the packet before sending */
 1050                 return (linux_sendto_hdrincl(td, args));
 1051 
 1052         msg.msg_name = PTRIN(args->to);
 1053         msg.msg_namelen = args->tolen;
 1054         msg.msg_iov = &aiov;
 1055         msg.msg_iovlen = 1;
 1056         msg.msg_control = NULL;
 1057         msg.msg_flags = 0;
 1058         aiov.iov_base = PTRIN(args->msg);
 1059         aiov.iov_len = args->len;
 1060         error = linux_sendit(td, args->s, &msg, args->flags, NULL,
 1061             UIO_USERSPACE);
 1062         return (error);
 1063 }
 1064 
 1065 struct linux_recvfrom_args {
 1066         int s;
 1067         l_uintptr_t buf;
 1068         int len;
 1069         int flags;
 1070         l_uintptr_t from;
 1071         l_uintptr_t fromlen;
 1072 };
 1073 
 1074 static int
 1075 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
 1076 {
 1077         struct recvfrom_args /* {
 1078                 int     s;
 1079                 caddr_t buf;
 1080                 size_t  len;
 1081                 int     flags;
 1082                 struct sockaddr * __restrict from;
 1083                 socklen_t * __restrict fromlenaddr;
 1084         } */ bsd_args;
 1085         size_t len;
 1086         int error;
 1087 
 1088         if ((error = copyin(PTRIN(args->fromlen), &len, sizeof(size_t))))
 1089                 return (error);
 1090 
 1091         bsd_args.s = args->s;
 1092         bsd_args.buf = PTRIN(args->buf);
 1093         bsd_args.len = args->len;
 1094         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1095         /* XXX: */
 1096         bsd_args.from = (struct sockaddr * __restrict)PTRIN(args->from);
 1097         bsd_args.fromlenaddr = PTRIN(args->fromlen);/* XXX */
 1098         
 1099         linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.from, len);
 1100         error = sys_recvfrom(td, &bsd_args);
 1101         bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.from);
 1102         
 1103         if (error)
 1104                 return (error);
 1105         if (args->from) {
 1106                 error = linux_sa_put((struct osockaddr *)
 1107                     PTRIN(args->from));
 1108                 if (error)
 1109                         return (error);
 1110         }
 1111         return (0);
 1112 }
 1113 
 1114 struct linux_sendmsg_args {
 1115         int s;
 1116         l_uintptr_t msg;
 1117         int flags;
 1118 };
 1119 
 1120 static int
 1121 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
 1122 {
 1123         struct cmsghdr *cmsg;
 1124         struct cmsgcred cmcred;
 1125         struct mbuf *control;
 1126         struct msghdr msg;
 1127         struct l_cmsghdr linux_cmsg;
 1128         struct l_cmsghdr *ptr_cmsg;
 1129         struct l_msghdr linux_msg;
 1130         struct iovec *iov;
 1131         socklen_t datalen;
 1132         struct sockaddr *sa;
 1133         sa_family_t sa_family;
 1134         void *data;
 1135         int error;
 1136 
 1137         error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
 1138         if (error)
 1139                 return (error);
 1140 
 1141         /*
 1142          * Some Linux applications (ping) define a non-NULL control data
 1143          * pointer, but a msg_controllen of 0, which is not allowed in the
 1144          * FreeBSD system call interface.  NULL the msg_control pointer in
 1145          * order to handle this case.  This should be checked, but allows the
 1146          * Linux ping to work.
 1147          */
 1148         if (PTRIN(linux_msg.msg_control) != NULL && linux_msg.msg_controllen == 0)
 1149                 linux_msg.msg_control = PTROUT(NULL);
 1150 
 1151         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1152         if (error)
 1153                 return (error);
 1154 
 1155 #ifdef COMPAT_LINUX32
 1156         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1157             &iov, EMSGSIZE);
 1158 #else
 1159         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1160 #endif
 1161         if (error)
 1162                 return (error);
 1163 
 1164         control = NULL;
 1165         cmsg = NULL;
 1166 
 1167         if ((ptr_cmsg = LINUX_CMSG_FIRSTHDR(&linux_msg)) != NULL) {
 1168                 error = kern_getsockname(td, args->s, &sa, &datalen);
 1169                 if (error)
 1170                         goto bad;
 1171                 sa_family = sa->sa_family;
 1172                 free(sa, M_SONAME);
 1173 
 1174                 error = ENOBUFS;
 1175                 cmsg = malloc(CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
 1176                 control = m_get(M_WAIT, MT_CONTROL);
 1177                 if (control == NULL)
 1178                         goto bad;
 1179 
 1180                 do {
 1181                         error = copyin(ptr_cmsg, &linux_cmsg,
 1182                             sizeof(struct l_cmsghdr));
 1183                         if (error)
 1184                                 goto bad;
 1185 
 1186                         error = EINVAL;
 1187                         if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr))
 1188                                 goto bad;
 1189 
 1190                         /*
 1191                          * Now we support only SCM_RIGHTS and SCM_CRED,
 1192                          * so return EINVAL in any other cmsg_type
 1193                          */
 1194                         cmsg->cmsg_type =
 1195                             linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
 1196                         cmsg->cmsg_level =
 1197                             linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
 1198                         if (cmsg->cmsg_type == -1
 1199                             || cmsg->cmsg_level != SOL_SOCKET)
 1200                                 goto bad;
 1201 
 1202                         /*
 1203                          * Some applications (e.g. pulseaudio) attempt to
 1204                          * send ancillary data even if the underlying protocol
 1205                          * doesn't support it which is not allowed in the
 1206                          * FreeBSD system call interface.
 1207                          */
 1208                         if (sa_family != AF_UNIX)
 1209                                 continue;
 1210 
 1211                         data = LINUX_CMSG_DATA(ptr_cmsg);
 1212                         datalen = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
 1213 
 1214                         switch (cmsg->cmsg_type)
 1215                         {
 1216                         case SCM_RIGHTS:
 1217                                 break;
 1218 
 1219                         case SCM_CREDS:
 1220                                 data = &cmcred;
 1221                                 datalen = sizeof(cmcred);
 1222 
 1223                                 /*
 1224                                  * The lower levels will fill in the structure
 1225                                  */
 1226                                 bzero(data, datalen);
 1227                                 break;
 1228                         }
 1229 
 1230                         cmsg->cmsg_len = CMSG_LEN(datalen);
 1231 
 1232                         error = ENOBUFS;
 1233                         if (!m_append(control, CMSG_HDRSZ, (c_caddr_t)cmsg))
 1234                                 goto bad;
 1235                         if (!m_append(control, datalen, (c_caddr_t)data))
 1236                                 goto bad;
 1237                 } while ((ptr_cmsg = LINUX_CMSG_NXTHDR(&linux_msg, ptr_cmsg)));
 1238 
 1239                 if (m_length(control, NULL) == 0) {
 1240                         m_freem(control);
 1241                         control = NULL;
 1242                 }
 1243         }
 1244 
 1245         msg.msg_iov = iov;
 1246         msg.msg_flags = 0;
 1247         error = linux_sendit(td, args->s, &msg, args->flags, control,
 1248             UIO_USERSPACE);
 1249 
 1250 bad:
 1251         free(iov, M_IOV);
 1252         if (cmsg)
 1253                 free(cmsg, M_TEMP);
 1254         return (error);
 1255 }
 1256 
 1257 struct linux_recvmsg_args {
 1258         int s;
 1259         l_uintptr_t msg;
 1260         int flags;
 1261 };
 1262 
 1263 static int
 1264 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
 1265 {
 1266         struct cmsghdr *cm;
 1267         struct cmsgcred *cmcred;
 1268         struct msghdr msg;
 1269         struct l_cmsghdr *linux_cmsg = NULL;
 1270         struct l_ucred linux_ucred;
 1271         socklen_t datalen, outlen;
 1272         struct l_msghdr linux_msg;
 1273         struct iovec *iov, *uiov;
 1274         struct mbuf *control = NULL;
 1275         struct mbuf **controlp;
 1276         caddr_t outbuf;
 1277         void *data;
 1278         int error, i, fd, fds, *fdp;
 1279 
 1280         error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
 1281         if (error)
 1282                 return (error);
 1283 
 1284         error = linux_to_bsd_msghdr(&msg, &linux_msg);
 1285         if (error)
 1286                 return (error);
 1287 
 1288 #ifdef COMPAT_LINUX32
 1289         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1290             &iov, EMSGSIZE);
 1291 #else
 1292         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1293 #endif
 1294         if (error)
 1295                 return (error);
 1296 
 1297         if (msg.msg_name) {
 1298                 error = linux_to_bsd_sockaddr((struct sockaddr *)msg.msg_name,
 1299                     msg.msg_namelen);
 1300                 if (error)
 1301                         goto bad;
 1302         }
 1303 
 1304         uiov = msg.msg_iov;
 1305         msg.msg_iov = iov;
 1306         controlp = (msg.msg_control != NULL) ? &control : NULL;
 1307         error = kern_recvit(td, args->s, &msg, UIO_USERSPACE, controlp);
 1308         msg.msg_iov = uiov;
 1309         if (error)
 1310                 goto bad;
 1311 
 1312         error = bsd_to_linux_msghdr(&msg, &linux_msg);
 1313         if (error)
 1314                 goto bad;
 1315 
 1316         if (linux_msg.msg_name) {
 1317                 error = bsd_to_linux_sockaddr((struct sockaddr *)
 1318                     PTRIN(linux_msg.msg_name));
 1319                 if (error)
 1320                         goto bad;
 1321         }
 1322         if (linux_msg.msg_name && linux_msg.msg_namelen > 2) {
 1323                 error = linux_sa_put(PTRIN(linux_msg.msg_name));
 1324                 if (error)
 1325                         goto bad;
 1326         }
 1327 
 1328         outbuf = PTRIN(linux_msg.msg_control);
 1329         outlen = 0;
 1330 
 1331         if (control) {
 1332                 linux_cmsg = malloc(L_CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
 1333 
 1334                 msg.msg_control = mtod(control, struct cmsghdr *);
 1335                 msg.msg_controllen = control->m_len;
 1336 
 1337                 cm = CMSG_FIRSTHDR(&msg);
 1338 
 1339                 while (cm != NULL) {
 1340                         linux_cmsg->cmsg_type =
 1341                             bsd_to_linux_cmsg_type(cm->cmsg_type);
 1342                         linux_cmsg->cmsg_level =
 1343                             bsd_to_linux_sockopt_level(cm->cmsg_level);
 1344                         if (linux_cmsg->cmsg_type == -1
 1345                             || cm->cmsg_level != SOL_SOCKET)
 1346                         {
 1347                                 error = EINVAL;
 1348                                 goto bad;
 1349                         }
 1350 
 1351                         data = CMSG_DATA(cm);
 1352                         datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1353 
 1354                         switch (cm->cmsg_type)
 1355                         {
 1356                         case SCM_RIGHTS:
 1357                                 if (args->flags & LINUX_MSG_CMSG_CLOEXEC) {
 1358                                         fds = datalen / sizeof(int);
 1359                                         fdp = data;
 1360                                         for (i = 0; i < fds; i++) {
 1361                                                 fd = *fdp++;
 1362                                                 (void)kern_fcntl(td, fd,
 1363                                                     F_SETFD, FD_CLOEXEC);
 1364                                         }
 1365                                 }
 1366                                 break;
 1367 
 1368                         case SCM_CREDS:
 1369                                 /*
 1370                                  * Currently LOCAL_CREDS is never in
 1371                                  * effect for Linux so no need to worry
 1372                                  * about sockcred
 1373                                  */
 1374                                 if (datalen != sizeof(*cmcred)) {
 1375                                         error = EMSGSIZE;
 1376                                         goto bad;
 1377                                 }
 1378                                 cmcred = (struct cmsgcred *)data;
 1379                                 bzero(&linux_ucred, sizeof(linux_ucred));
 1380                                 linux_ucred.pid = cmcred->cmcred_pid;
 1381                                 linux_ucred.uid = cmcred->cmcred_uid;
 1382                                 linux_ucred.gid = cmcred->cmcred_gid;
 1383                                 data = &linux_ucred;
 1384                                 datalen = sizeof(linux_ucred);
 1385                                 break;
 1386                         }
 1387 
 1388                         if (outlen + LINUX_CMSG_LEN(datalen) >
 1389                             linux_msg.msg_controllen) {
 1390                                 if (outlen == 0) {
 1391                                         error = EMSGSIZE;
 1392                                         goto bad;
 1393                                 } else {
 1394                                         linux_msg.msg_flags |=
 1395                                             LINUX_MSG_CTRUNC;
 1396                                         goto out;
 1397                                 }
 1398                         }
 1399 
 1400                         linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
 1401 
 1402                         error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
 1403                         if (error)
 1404                                 goto bad;
 1405                         outbuf += L_CMSG_HDRSZ;
 1406 
 1407                         error = copyout(data, outbuf, datalen);
 1408                         if (error)
 1409                                 goto bad;
 1410 
 1411                         outbuf += LINUX_CMSG_ALIGN(datalen);
 1412                         outlen += LINUX_CMSG_LEN(datalen);
 1413 
 1414                         cm = CMSG_NXTHDR(&msg, cm);
 1415                 }
 1416         }
 1417 
 1418 out:
 1419         linux_msg.msg_controllen = outlen;
 1420         error = copyout(&linux_msg, PTRIN(args->msg), sizeof(linux_msg));
 1421 
 1422 bad:
 1423         free(iov, M_IOV);
 1424         if (control != NULL)
 1425                 m_freem(control);
 1426         if (linux_cmsg != NULL)
 1427                 free(linux_cmsg, M_TEMP);
 1428 
 1429         return (error);
 1430 }
 1431 
 1432 struct linux_shutdown_args {
 1433         int s;
 1434         int how;
 1435 };
 1436 
 1437 static int
 1438 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1439 {
 1440         struct shutdown_args /* {
 1441                 int s;
 1442                 int how;
 1443         } */ bsd_args;
 1444 
 1445         bsd_args.s = args->s;
 1446         bsd_args.how = args->how;
 1447         return (sys_shutdown(td, &bsd_args));
 1448 }
 1449 
 1450 struct linux_setsockopt_args {
 1451         int s;
 1452         int level;
 1453         int optname;
 1454         l_uintptr_t optval;
 1455         int optlen;
 1456 };
 1457 
 1458 static int
 1459 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1460 {
 1461         struct setsockopt_args /* {
 1462                 int s;
 1463                 int level;
 1464                 int name;
 1465                 caddr_t val;
 1466                 int valsize;
 1467         } */ bsd_args;
 1468         l_timeval linux_tv;
 1469         struct timeval tv;
 1470         int error, name;
 1471 
 1472         bsd_args.s = args->s;
 1473         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1474         switch (bsd_args.level) {
 1475         case SOL_SOCKET:
 1476                 name = linux_to_bsd_so_sockopt(args->optname);
 1477                 switch (name) {
 1478                 case SO_RCVTIMEO:
 1479                         /* FALLTHROUGH */
 1480                 case SO_SNDTIMEO:
 1481                         error = copyin(PTRIN(args->optval), &linux_tv,
 1482                             sizeof(linux_tv));
 1483                         if (error)
 1484                                 return (error);
 1485                         tv.tv_sec = linux_tv.tv_sec;
 1486                         tv.tv_usec = linux_tv.tv_usec;
 1487                         return (kern_setsockopt(td, args->s, bsd_args.level,
 1488                             name, &tv, UIO_SYSSPACE, sizeof(tv)));
 1489                         /* NOTREACHED */
 1490                         break;
 1491                 default:
 1492                         break;
 1493                 }
 1494                 break;
 1495         case IPPROTO_IP:
 1496                 name = linux_to_bsd_ip_sockopt(args->optname);
 1497                 break;
 1498         case IPPROTO_TCP:
 1499                 /* Linux TCP option values match BSD's */
 1500                 name = args->optname;
 1501                 break;
 1502         default:
 1503                 name = -1;
 1504                 break;
 1505         }
 1506         if (name == -1)
 1507                 return (ENOPROTOOPT);
 1508 
 1509         bsd_args.name = name;
 1510         bsd_args.val = PTRIN(args->optval);
 1511         bsd_args.valsize = args->optlen;
 1512 
 1513         if (name == IPV6_NEXTHOP) {
 1514                 linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
 1515                         bsd_args.valsize);
 1516                 error = sys_setsockopt(td, &bsd_args);
 1517                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1518         } else
 1519                 error = sys_setsockopt(td, &bsd_args);
 1520 
 1521         return (error);
 1522 }
 1523 
 1524 struct linux_getsockopt_args {
 1525         int s;
 1526         int level;
 1527         int optname;
 1528         l_uintptr_t optval;
 1529         l_uintptr_t optlen;
 1530 };
 1531 
 1532 static int
 1533 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1534 {
 1535         struct getsockopt_args /* {
 1536                 int s;
 1537                 int level;
 1538                 int name;
 1539                 caddr_t val;
 1540                 int *avalsize;
 1541         } */ bsd_args;
 1542         l_timeval linux_tv;
 1543         struct timeval tv;
 1544         socklen_t tv_len, xulen;
 1545         struct xucred xu;
 1546         struct l_ucred lxu;
 1547         int error, name;
 1548 
 1549         bsd_args.s = args->s;
 1550         bsd_args.level = linux_to_bsd_sockopt_level(args->level);
 1551         switch (bsd_args.level) {
 1552         case SOL_SOCKET:
 1553                 name = linux_to_bsd_so_sockopt(args->optname);
 1554                 switch (name) {
 1555                 case SO_RCVTIMEO:
 1556                         /* FALLTHROUGH */
 1557                 case SO_SNDTIMEO:
 1558                         tv_len = sizeof(tv);
 1559                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1560                             name, &tv, UIO_SYSSPACE, &tv_len);
 1561                         if (error)
 1562                                 return (error);
 1563                         linux_tv.tv_sec = tv.tv_sec;
 1564                         linux_tv.tv_usec = tv.tv_usec;
 1565                         return (copyout(&linux_tv, PTRIN(args->optval),
 1566                             sizeof(linux_tv)));
 1567                         /* NOTREACHED */
 1568                         break;
 1569                 case LOCAL_PEERCRED:
 1570                         if (args->optlen != sizeof(lxu))
 1571                                 return (EINVAL);
 1572                         xulen = sizeof(xu);
 1573                         error = kern_getsockopt(td, args->s, bsd_args.level,
 1574                             name, &xu, UIO_SYSSPACE, &xulen);
 1575                         if (error)
 1576                                 return (error);
 1577                         /*
 1578                          * XXX Use 0 for pid as the FreeBSD does not cache peer pid.
 1579                          */
 1580                         lxu.pid = 0;
 1581                         lxu.uid = xu.cr_uid;
 1582                         lxu.gid = xu.cr_gid;
 1583                         return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
 1584                         /* NOTREACHED */
 1585                         break;
 1586                 default:
 1587                         break;
 1588                 }
 1589                 break;
 1590         case IPPROTO_IP:
 1591                 name = linux_to_bsd_ip_sockopt(args->optname);
 1592                 break;
 1593         case IPPROTO_TCP:
 1594                 /* Linux TCP option values match BSD's */
 1595                 name = args->optname;
 1596                 break;
 1597         default:
 1598                 name = -1;
 1599                 break;
 1600         }
 1601         if (name == -1)
 1602                 return (EINVAL);
 1603 
 1604         bsd_args.name = name;
 1605         bsd_args.val = PTRIN(args->optval);
 1606         bsd_args.avalsize = PTRIN(args->optlen);
 1607 
 1608         if (name == IPV6_NEXTHOP) {
 1609                 error = sys_getsockopt(td, &bsd_args);
 1610                 bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
 1611         } else
 1612                 error = sys_getsockopt(td, &bsd_args);
 1613 
 1614         return (error);
 1615 }
 1616 
 1617 /* Argument list sizes for linux_socketcall */
 1618 
 1619 #define LINUX_AL(x) ((x) * sizeof(l_ulong))
 1620 
 1621 static const unsigned char lxs_args[] = {
 1622         LINUX_AL(0) /* unused*/,        LINUX_AL(3) /* socket */,
 1623         LINUX_AL(3) /* bind */,         LINUX_AL(3) /* connect */,
 1624         LINUX_AL(2) /* listen */,       LINUX_AL(3) /* accept */,
 1625         LINUX_AL(3) /* getsockname */,  LINUX_AL(3) /* getpeername */,
 1626         LINUX_AL(4) /* socketpair */,   LINUX_AL(4) /* send */,
 1627         LINUX_AL(4) /* recv */,         LINUX_AL(6) /* sendto */,
 1628         LINUX_AL(6) /* recvfrom */,     LINUX_AL(2) /* shutdown */,
 1629         LINUX_AL(5) /* setsockopt */,   LINUX_AL(5) /* getsockopt */,
 1630         LINUX_AL(3) /* sendmsg */,      LINUX_AL(3) /* recvmsg */,
 1631         LINUX_AL(4) /* accept4 */
 1632 };
 1633 
 1634 #define LINUX_AL_SIZE   sizeof(lxs_args) / sizeof(lxs_args[0]) - 1
 1635 
 1636 int
 1637 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 1638 {
 1639         l_ulong a[6];
 1640         void *arg;
 1641         int error;
 1642 
 1643         if (args->what < LINUX_SOCKET || args->what > LINUX_AL_SIZE)
 1644                 return (EINVAL);
 1645         error = copyin(PTRIN(args->args), a, lxs_args[args->what]);
 1646         if (error)
 1647                 return (error);
 1648 
 1649         arg = a;
 1650         switch (args->what) {
 1651         case LINUX_SOCKET:
 1652                 return (linux_socket(td, arg));
 1653         case LINUX_BIND:
 1654                 return (linux_bind(td, arg));
 1655         case LINUX_CONNECT:
 1656                 return (linux_connect(td, arg));
 1657         case LINUX_LISTEN:
 1658                 return (linux_listen(td, arg));
 1659         case LINUX_ACCEPT:
 1660                 return (linux_accept(td, arg));
 1661         case LINUX_GETSOCKNAME:
 1662                 return (linux_getsockname(td, arg));
 1663         case LINUX_GETPEERNAME:
 1664                 return (linux_getpeername(td, arg));
 1665         case LINUX_SOCKETPAIR:
 1666                 return (linux_socketpair(td, arg));
 1667         case LINUX_SEND:
 1668                 return (linux_send(td, arg));
 1669         case LINUX_RECV:
 1670                 return (linux_recv(td, arg));
 1671         case LINUX_SENDTO:
 1672                 return (linux_sendto(td, arg));
 1673         case LINUX_RECVFROM:
 1674                 return (linux_recvfrom(td, arg));
 1675         case LINUX_SHUTDOWN:
 1676                 return (linux_shutdown(td, arg));
 1677         case LINUX_SETSOCKOPT:
 1678                 return (linux_setsockopt(td, arg));
 1679         case LINUX_GETSOCKOPT:
 1680                 return (linux_getsockopt(td, arg));
 1681         case LINUX_SENDMSG:
 1682                 return (linux_sendmsg(td, arg));
 1683         case LINUX_RECVMSG:
 1684                 return (linux_recvmsg(td, arg));
 1685         case LINUX_ACCEPT4:
 1686                 return (linux_accept4(td, arg));
 1687         }
 1688 
 1689         uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
 1690         return (ENOSYS);
 1691 }
Cache object: ae36678595c172ce369d1fb027fb1e96
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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
