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freebsd-dev/sys/compat/linux/linux_socket.c
Eitan Adler 1eb9ea583b Remove check for NULL prior to free(9) and m_freem(9). 
Approved by:	cperciva (mentor)
2013-03-04 02:21:34 +00:00

1710 lines
38 KiB
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/*-
* Copyright (c) 1995 Søren Schmidt
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* XXX we use functions that might not exist. */
#include "opt_compat.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/capability.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syscallsubr.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/un.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#endif
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_socket.h>
#include <compat/linux/linux_util.h>
static int linux_to_bsd_domain(int);
/*
* Reads a linux sockaddr and does any necessary translation.
* Linux sockaddrs don't have a length field, only a family.
* Copy the osockaddr structure pointed to by osa to kernel, adjust
* family and convert to sockaddr.
*/
static int
linux_getsockaddr(struct sockaddr **sap, const struct osockaddr *osa, int salen)
{
struct sockaddr *sa;
struct osockaddr *kosa;
#ifdef INET6
struct sockaddr_in6 *sin6;
int oldv6size;
#endif
char *name;
int bdom, error, hdrlen, namelen;
if (salen < 2 || salen > UCHAR_MAX || !osa)
return (EINVAL);
#ifdef INET6
oldv6size = 0;
/*
* Check for old (pre-RFC2553) sockaddr_in6. We may accept it
* if it's a v4-mapped address, so reserve the proper space
* for it.
*/
if (salen == sizeof(struct sockaddr_in6) - sizeof(uint32_t)) {
salen += sizeof(uint32_t);
oldv6size = 1;
}
#endif
kosa = malloc(salen, M_SONAME, M_WAITOK);
if ((error = copyin(osa, kosa, salen)))
goto out;
bdom = linux_to_bsd_domain(kosa->sa_family);
if (bdom == -1) {
error = EAFNOSUPPORT;
goto out;
}
#ifdef INET6
/*
* Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6,
* which lacks the scope id compared with RFC2553 one. If we detect
* the situation, reject the address and write a message to system log.
*
* Still accept addresses for which the scope id is not used.
*/
if (oldv6size) {
if (bdom == AF_INET6) {
sin6 = (struct sockaddr_in6 *)kosa;
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
(!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
!IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
!IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) &&
!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
sin6->sin6_scope_id = 0;
} else {
log(LOG_DEBUG,
"obsolete pre-RFC2553 sockaddr_in6 rejected\n");
error = EINVAL;
goto out;
}
} else
salen -= sizeof(uint32_t);
}
#endif
if (bdom == AF_INET) {
if (salen < sizeof(struct sockaddr_in)) {
error = EINVAL;
goto out;
}
salen = sizeof(struct sockaddr_in);
}
if (bdom == AF_LOCAL && salen > sizeof(struct sockaddr_un)) {
hdrlen = offsetof(struct sockaddr_un, sun_path);
name = ((struct sockaddr_un *)kosa)->sun_path;
if (*name == '\0') {
/*
* Linux abstract namespace starts with a NULL byte.
* XXX We do not support abstract namespace yet.
*/
namelen = strnlen(name + 1, salen - hdrlen - 1) + 1;
} else
namelen = strnlen(name, salen - hdrlen);
salen = hdrlen + namelen;
if (salen > sizeof(struct sockaddr_un)) {
error = ENAMETOOLONG;
goto out;
}
}
sa = (struct sockaddr *)kosa;
sa->sa_family = bdom;
sa->sa_len = salen;
*sap = sa;
return (0);
out:
free(kosa, M_SONAME);
return (error);
}
static int
linux_to_bsd_domain(int domain)
{
switch (domain) {
case LINUX_AF_UNSPEC:
return (AF_UNSPEC);
case LINUX_AF_UNIX:
return (AF_LOCAL);
case LINUX_AF_INET:
return (AF_INET);
case LINUX_AF_INET6:
return (AF_INET6);
case LINUX_AF_AX25:
return (AF_CCITT);
case LINUX_AF_IPX:
return (AF_IPX);
case LINUX_AF_APPLETALK:
return (AF_APPLETALK);
}
return (-1);
}
static int
bsd_to_linux_domain(int domain)
{
switch (domain) {
case AF_UNSPEC:
return (LINUX_AF_UNSPEC);
case AF_LOCAL:
return (LINUX_AF_UNIX);
case AF_INET:
return (LINUX_AF_INET);
case AF_INET6:
return (LINUX_AF_INET6);
case AF_CCITT:
return (LINUX_AF_AX25);
case AF_IPX:
return (LINUX_AF_IPX);
case AF_APPLETALK:
return (LINUX_AF_APPLETALK);
}
return (-1);
}
static int
linux_to_bsd_sockopt_level(int level)
{
switch (level) {
case LINUX_SOL_SOCKET:
return (SOL_SOCKET);
}
return (level);
}
static int
bsd_to_linux_sockopt_level(int level)
{
switch (level) {
case SOL_SOCKET:
return (LINUX_SOL_SOCKET);
}
return (level);
}
static int
linux_to_bsd_ip_sockopt(int opt)
{
switch (opt) {
case LINUX_IP_TOS:
return (IP_TOS);
case LINUX_IP_TTL:
return (IP_TTL);
case LINUX_IP_OPTIONS:
return (IP_OPTIONS);
case LINUX_IP_MULTICAST_IF:
return (IP_MULTICAST_IF);
case LINUX_IP_MULTICAST_TTL:
return (IP_MULTICAST_TTL);
case LINUX_IP_MULTICAST_LOOP:
return (IP_MULTICAST_LOOP);
case LINUX_IP_ADD_MEMBERSHIP:
return (IP_ADD_MEMBERSHIP);
case LINUX_IP_DROP_MEMBERSHIP:
return (IP_DROP_MEMBERSHIP);
case LINUX_IP_HDRINCL:
return (IP_HDRINCL);
}
return (-1);
}
static int
linux_to_bsd_so_sockopt(int opt)
{
switch (opt) {
case LINUX_SO_DEBUG:
return (SO_DEBUG);
case LINUX_SO_REUSEADDR:
return (SO_REUSEADDR);
case LINUX_SO_TYPE:
return (SO_TYPE);
case LINUX_SO_ERROR:
return (SO_ERROR);
case LINUX_SO_DONTROUTE:
return (SO_DONTROUTE);
case LINUX_SO_BROADCAST:
return (SO_BROADCAST);
case LINUX_SO_SNDBUF:
return (SO_SNDBUF);
case LINUX_SO_RCVBUF:
return (SO_RCVBUF);
case LINUX_SO_KEEPALIVE:
return (SO_KEEPALIVE);
case LINUX_SO_OOBINLINE:
return (SO_OOBINLINE);
case LINUX_SO_LINGER:
return (SO_LINGER);
case LINUX_SO_PEERCRED:
return (LOCAL_PEERCRED);
case LINUX_SO_RCVLOWAT:
return (SO_RCVLOWAT);
case LINUX_SO_SNDLOWAT:
return (SO_SNDLOWAT);
case LINUX_SO_RCVTIMEO:
return (SO_RCVTIMEO);
case LINUX_SO_SNDTIMEO:
return (SO_SNDTIMEO);
case LINUX_SO_TIMESTAMP:
return (SO_TIMESTAMP);
case LINUX_SO_ACCEPTCONN:
return (SO_ACCEPTCONN);
}
return (-1);
}
static int
linux_to_bsd_tcp_sockopt(int opt)
{
switch (opt) {
case LINUX_TCP_NODELAY:
return (TCP_NODELAY);
case LINUX_TCP_MAXSEG:
return (TCP_MAXSEG);
case LINUX_TCP_KEEPIDLE:
return (TCP_KEEPIDLE);
case LINUX_TCP_KEEPINTVL:
return (TCP_KEEPINTVL);
case LINUX_TCP_KEEPCNT:
return (TCP_KEEPCNT);
case LINUX_TCP_MD5SIG:
return (TCP_MD5SIG);
}
return (-1);
}
static int
linux_to_bsd_msg_flags(int flags)
{
int ret_flags = 0;
if (flags & LINUX_MSG_OOB)
ret_flags |= MSG_OOB;
if (flags & LINUX_MSG_PEEK)
ret_flags |= MSG_PEEK;
if (flags & LINUX_MSG_DONTROUTE)
ret_flags |= MSG_DONTROUTE;
if (flags & LINUX_MSG_CTRUNC)
ret_flags |= MSG_CTRUNC;
if (flags & LINUX_MSG_TRUNC)
ret_flags |= MSG_TRUNC;
if (flags & LINUX_MSG_DONTWAIT)
ret_flags |= MSG_DONTWAIT;
if (flags & LINUX_MSG_EOR)
ret_flags |= MSG_EOR;
if (flags & LINUX_MSG_WAITALL)
ret_flags |= MSG_WAITALL;
if (flags & LINUX_MSG_NOSIGNAL)
ret_flags |= MSG_NOSIGNAL;
#if 0 /* not handled */
if (flags & LINUX_MSG_PROXY)
;
if (flags & LINUX_MSG_FIN)
;
if (flags & LINUX_MSG_SYN)
;
if (flags & LINUX_MSG_CONFIRM)
;
if (flags & LINUX_MSG_RST)
;
if (flags & LINUX_MSG_ERRQUEUE)
;
#endif
return ret_flags;
}
/*
* If bsd_to_linux_sockaddr() or linux_to_bsd_sockaddr() faults, then the
* native syscall will fault. Thus, we don't really need to check the
* return values for these functions.
*/
static int
bsd_to_linux_sockaddr(struct sockaddr *arg)
{
struct sockaddr sa;
size_t sa_len = sizeof(struct sockaddr);
int error;
if ((error = copyin(arg, &sa, sa_len)))
return (error);
*(u_short *)&sa = sa.sa_family;
error = copyout(&sa, arg, sa_len);
return (error);
}
static int
linux_to_bsd_sockaddr(struct sockaddr *arg, int len)
{
struct sockaddr sa;
size_t sa_len = sizeof(struct sockaddr);
int error;
if ((error = copyin(arg, &sa, sa_len)))
return (error);
sa.sa_family = *(sa_family_t *)&sa;
sa.sa_len = len;
error = copyout(&sa, arg, sa_len);
return (error);
}
static int
linux_sa_put(struct osockaddr *osa)
{
struct osockaddr sa;
int error, bdom;
/*
* Only read/write the osockaddr family part, the rest is
* not changed.
*/
error = copyin(osa, &sa, sizeof(sa.sa_family));
if (error)
return (error);
bdom = bsd_to_linux_domain(sa.sa_family);
if (bdom == -1)
return (EINVAL);
sa.sa_family = bdom;
error = copyout(&sa, osa, sizeof(sa.sa_family));
if (error)
return (error);
return (0);
}
static int
linux_to_bsd_cmsg_type(int cmsg_type)
{
switch (cmsg_type) {
case LINUX_SCM_RIGHTS:
return (SCM_RIGHTS);
case LINUX_SCM_CREDENTIALS:
return (SCM_CREDS);
}
return (-1);
}
static int
bsd_to_linux_cmsg_type(int cmsg_type)
{
switch (cmsg_type) {
case SCM_RIGHTS:
return (LINUX_SCM_RIGHTS);
case SCM_CREDS:
return (LINUX_SCM_CREDENTIALS);
}
return (-1);
}
static int
linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
{
if (lhdr->msg_controllen > INT_MAX)
return (ENOBUFS);
bhdr->msg_name = PTRIN(lhdr->msg_name);
bhdr->msg_namelen = lhdr->msg_namelen;
bhdr->msg_iov = PTRIN(lhdr->msg_iov);
bhdr->msg_iovlen = lhdr->msg_iovlen;
bhdr->msg_control = PTRIN(lhdr->msg_control);
/*
* msg_controllen is skipped since BSD and LINUX control messages
* are potentially different sizes (e.g. the cred structure used
* by SCM_CREDS is different between the two operating system).
*
* The caller can set it (if necessary) after converting all the
* control messages.
*/
bhdr->msg_flags = linux_to_bsd_msg_flags(lhdr->msg_flags);
return (0);
}
static int
bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
{
lhdr->msg_name = PTROUT(bhdr->msg_name);
lhdr->msg_namelen = bhdr->msg_namelen;
lhdr->msg_iov = PTROUT(bhdr->msg_iov);
lhdr->msg_iovlen = bhdr->msg_iovlen;
lhdr->msg_control = PTROUT(bhdr->msg_control);
/*
* msg_controllen is skipped since BSD and LINUX control messages
* are potentially different sizes (e.g. the cred structure used
* by SCM_CREDS is different between the two operating system).
*
* The caller can set it (if necessary) after converting all the
* control messages.
*/
/* msg_flags skipped */
return (0);
}
static int
linux_set_socket_flags(struct thread *td, int s, int flags)
{
int error;
if (flags & LINUX_SOCK_NONBLOCK) {
error = kern_fcntl(td, s, F_SETFL, O_NONBLOCK);
if (error)
return (error);
}
if (flags & LINUX_SOCK_CLOEXEC) {
error = kern_fcntl(td, s, F_SETFD, FD_CLOEXEC);
if (error)
return (error);
}
return (0);
}
static int
linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
struct mbuf *control, enum uio_seg segflg)
{
struct sockaddr *to;
int error;
if (mp->msg_name != NULL) {
error = linux_getsockaddr(&to, mp->msg_name, mp->msg_namelen);
if (error)
return (error);
mp->msg_name = to;
} else
to = NULL;
error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
segflg);
if (to)
free(to, M_SONAME);
return (error);
}
/* Return 0 if IP_HDRINCL is set for the given socket. */
static int
linux_check_hdrincl(struct thread *td, int s)
{
int error, optval, size_val;
size_val = sizeof(optval);
error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
&optval, UIO_SYSSPACE, &size_val);
if (error)
return (error);
return (optval == 0);
}
struct linux_sendto_args {
int s;
l_uintptr_t msg;
int len;
int flags;
l_uintptr_t to;
int tolen;
};
/*
* Updated sendto() when IP_HDRINCL is set:
* tweak endian-dependent fields in the IP packet.
*/
static int
linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
{
/*
* linux_ip_copysize defines how many bytes we should copy
* from the beginning of the IP packet before we customize it for BSD.
* It should include all the fields we modify (ip_len and ip_off).
*/
#define linux_ip_copysize 8
struct ip *packet;
struct msghdr msg;
struct iovec aiov[1];
int error;
/* Check that the packet isn't too big or too small. */
if (linux_args->len < linux_ip_copysize ||
linux_args->len > IP_MAXPACKET)
return (EINVAL);
packet = (struct ip *)malloc(linux_args->len, M_TEMP, M_WAITOK);
/* Make kernel copy of the packet to be sent */
if ((error = copyin(PTRIN(linux_args->msg), packet,
linux_args->len)))
goto goout;
/* Convert fields from Linux to BSD raw IP socket format */
packet->ip_len = linux_args->len;
packet->ip_off = ntohs(packet->ip_off);
/* Prepare the msghdr and iovec structures describing the new packet */
msg.msg_name = PTRIN(linux_args->to);
msg.msg_namelen = linux_args->tolen;
msg.msg_iov = aiov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_flags = 0;
aiov[0].iov_base = (char *)packet;
aiov[0].iov_len = linux_args->len;
error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
NULL, UIO_SYSSPACE);
goout:
free(packet, M_TEMP);
return (error);
}
struct linux_socket_args {
int domain;
int type;
int protocol;
};
static int
linux_socket(struct thread *td, struct linux_socket_args *args)
{
struct socket_args /* {
int domain;
int type;
int protocol;
} */ bsd_args;
int retval_socket, socket_flags;
bsd_args.protocol = args->protocol;
socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
return (EINVAL);
bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
return (EINVAL);
bsd_args.domain = linux_to_bsd_domain(args->domain);
if (bsd_args.domain == -1)
return (EAFNOSUPPORT);
retval_socket = sys_socket(td, &bsd_args);
if (retval_socket)
return (retval_socket);
retval_socket = linux_set_socket_flags(td, td->td_retval[0],
socket_flags);
if (retval_socket) {
(void)kern_close(td, td->td_retval[0]);
goto out;
}
if (bsd_args.type == SOCK_RAW
&& (bsd_args.protocol == IPPROTO_RAW || bsd_args.protocol == 0)
&& bsd_args.domain == PF_INET) {
/* It's a raw IP socket: set the IP_HDRINCL option. */
int hdrincl;
hdrincl = 1;
/* We ignore any error returned by kern_setsockopt() */
kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
&hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
}
#ifdef INET6
/*
* Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
* and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
* For simplicity we do this unconditionally of the net.inet6.ip6.v6only
* sysctl value.
*/
if (bsd_args.domain == PF_INET6) {
int v6only;
v6only = 0;
/* We ignore any error returned by setsockopt() */
kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
&v6only, UIO_SYSSPACE, sizeof(v6only));
}
#endif
out:
return (retval_socket);
}
struct linux_bind_args {
int s;
l_uintptr_t name;
int namelen;
};
static int
linux_bind(struct thread *td, struct linux_bind_args *args)
{
struct sockaddr *sa;
int error;
error = linux_getsockaddr(&sa, PTRIN(args->name),
args->namelen);
if (error)
return (error);
error = kern_bind(td, args->s, sa);
free(sa, M_SONAME);
if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
return (EINVAL);
return (error);
}
struct linux_connect_args {
int s;
l_uintptr_t name;
int namelen;
};
int linux_connect(struct thread *, struct linux_connect_args *);
int
linux_connect(struct thread *td, struct linux_connect_args *args)
{
struct socket *so;
struct sockaddr *sa;
u_int fflag;
int error;
error = linux_getsockaddr(&sa, (struct osockaddr *)PTRIN(args->name),
args->namelen);
if (error)
return (error);
error = kern_connect(td, args->s, sa);
free(sa, M_SONAME);
if (error != EISCONN)
return (error);
/*
* Linux doesn't return EISCONN the first time it occurs,
* when on a non-blocking socket. Instead it returns the
* error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
*
* XXXRW: Instead of using fgetsock(), check that it is a
* socket and use the file descriptor reference instead of
* creating a new one.
*/
error = fgetsock(td, args->s, CAP_CONNECT, &so, &fflag);
if (error == 0) {
error = EISCONN;
if (fflag & FNONBLOCK) {
SOCK_LOCK(so);
if (so->so_emuldata == 0)
error = so->so_error;
so->so_emuldata = (void *)1;
SOCK_UNLOCK(so);
}
fputsock(so);
}
return (error);
}
struct linux_listen_args {
int s;
int backlog;
};
static int
linux_listen(struct thread *td, struct linux_listen_args *args)
{
struct listen_args /* {
int s;
int backlog;
} */ bsd_args;
bsd_args.s = args->s;
bsd_args.backlog = args->backlog;
return (sys_listen(td, &bsd_args));
}
static int
linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
l_uintptr_t namelen, int flags)
{
struct accept_args /* {
int s;
struct sockaddr * __restrict name;
socklen_t * __restrict anamelen;
} */ bsd_args;
int error;
if (flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
return (EINVAL);
bsd_args.s = s;
/* XXX: */
bsd_args.name = (struct sockaddr * __restrict)PTRIN(addr);
bsd_args.anamelen = PTRIN(namelen);/* XXX */
error = sys_accept(td, &bsd_args);
bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
if (error) {
if (error == EFAULT && namelen != sizeof(struct sockaddr_in))
return (EINVAL);
return (error);
}
/*
* linux appears not to copy flags from the parent socket to the
* accepted one, so we must clear the flags in the new descriptor
* and apply the requested flags.
*/
error = kern_fcntl(td, td->td_retval[0], F_SETFL, 0);
if (error)
goto out;
error = linux_set_socket_flags(td, td->td_retval[0], flags);
if (error)
goto out;
if (addr)
error = linux_sa_put(PTRIN(addr));
out:
if (error) {
(void)kern_close(td, td->td_retval[0]);
td->td_retval[0] = 0;
}
return (error);
}
struct linux_accept_args {
int s;
l_uintptr_t addr;
l_uintptr_t namelen;
};
static int
linux_accept(struct thread *td, struct linux_accept_args *args)
{
return (linux_accept_common(td, args->s, args->addr,
args->namelen, 0));
}
struct linux_accept4_args {
int s;
l_uintptr_t addr;
l_uintptr_t namelen;
int flags;
};
static int
linux_accept4(struct thread *td, struct linux_accept4_args *args)
{
return (linux_accept_common(td, args->s, args->addr,
args->namelen, args->flags));
}
struct linux_getsockname_args {
int s;
l_uintptr_t addr;
l_uintptr_t namelen;
};
static int
linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
{
struct getsockname_args /* {
int fdes;
struct sockaddr * __restrict asa;
socklen_t * __restrict alen;
} */ bsd_args;
int error;
bsd_args.fdes = args->s;
/* XXX: */
bsd_args.asa = (struct sockaddr * __restrict)PTRIN(args->addr);
bsd_args.alen = PTRIN(args->namelen); /* XXX */
error = sys_getsockname(td, &bsd_args);
bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
if (error)
return (error);
error = linux_sa_put(PTRIN(args->addr));
if (error)
return (error);
return (0);
}
struct linux_getpeername_args {
int s;
l_uintptr_t addr;
l_uintptr_t namelen;
};
static int
linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
{
struct getpeername_args /* {
int fdes;
caddr_t asa;
int *alen;
} */ bsd_args;
int error;
bsd_args.fdes = args->s;
bsd_args.asa = (struct sockaddr *)PTRIN(args->addr);
bsd_args.alen = (int *)PTRIN(args->namelen);
error = sys_getpeername(td, &bsd_args);
bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.asa);
if (error)
return (error);
error = linux_sa_put(PTRIN(args->addr));
if (error)
return (error);
return (0);
}
struct linux_socketpair_args {
int domain;
int type;
int protocol;
l_uintptr_t rsv;
};
static int
linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
{
struct socketpair_args /* {
int domain;
int type;
int protocol;
int *rsv;
} */ bsd_args;
int error, socket_flags;
int sv[2];
bsd_args.domain = linux_to_bsd_domain(args->domain);
if (bsd_args.domain != PF_LOCAL)
return (EAFNOSUPPORT);
socket_flags = args->type & ~LINUX_SOCK_TYPE_MASK;
if (socket_flags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
return (EINVAL);
bsd_args.type = args->type & LINUX_SOCK_TYPE_MASK;
if (bsd_args.type < 0 || bsd_args.type > LINUX_SOCK_MAX)
return (EINVAL);
if (args->protocol != 0 && args->protocol != PF_UNIX)
/*
* Use of PF_UNIX as protocol argument is not right,
* but Linux does it.
* Do not map PF_UNIX as its Linux value is identical
* to FreeBSD one.
*/
return (EPROTONOSUPPORT);
else
bsd_args.protocol = 0;
bsd_args.rsv = (int *)PTRIN(args->rsv);
error = kern_socketpair(td, bsd_args.domain, bsd_args.type,
bsd_args.protocol, sv);
if (error)
return (error);
error = linux_set_socket_flags(td, sv[0], socket_flags);
if (error)
goto out;
error = linux_set_socket_flags(td, sv[1], socket_flags);
if (error)
goto out;
error = copyout(sv, bsd_args.rsv, 2 * sizeof(int));
out:
if (error) {
(void)kern_close(td, sv[0]);
(void)kern_close(td, sv[1]);
}
return (error);
}
struct linux_send_args {
int s;
l_uintptr_t msg;
int len;
int flags;
};
static int
linux_send(struct thread *td, struct linux_send_args *args)
{
struct sendto_args /* {
int s;
caddr_t buf;
int len;
int flags;
caddr_t to;
int tolen;
} */ bsd_args;
bsd_args.s = args->s;
bsd_args.buf = (caddr_t)PTRIN(args->msg);
bsd_args.len = args->len;
bsd_args.flags = args->flags;
bsd_args.to = NULL;
bsd_args.tolen = 0;
return sys_sendto(td, &bsd_args);
}
struct linux_recv_args {
int s;
l_uintptr_t msg;
int len;
int flags;
};
static int
linux_recv(struct thread *td, struct linux_recv_args *args)
{
struct recvfrom_args /* {
int s;
caddr_t buf;
int len;
int flags;
struct sockaddr *from;
socklen_t fromlenaddr;
} */ bsd_args;
bsd_args.s = args->s;
bsd_args.buf = (caddr_t)PTRIN(args->msg);
bsd_args.len = args->len;
bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
bsd_args.from = NULL;
bsd_args.fromlenaddr = 0;
return (sys_recvfrom(td, &bsd_args));
}
static int
linux_sendto(struct thread *td, struct linux_sendto_args *args)
{
struct msghdr msg;
struct iovec aiov;
int error;
if (linux_check_hdrincl(td, args->s) == 0)
/* IP_HDRINCL set, tweak the packet before sending */
return (linux_sendto_hdrincl(td, args));
msg.msg_name = PTRIN(args->to);
msg.msg_namelen = args->tolen;
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_flags = 0;
aiov.iov_base = PTRIN(args->msg);
aiov.iov_len = args->len;
error = linux_sendit(td, args->s, &msg, args->flags, NULL,
UIO_USERSPACE);
return (error);
}
struct linux_recvfrom_args {
int s;
l_uintptr_t buf;
int len;
int flags;
l_uintptr_t from;
l_uintptr_t fromlen;
};
static int
linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
{
struct recvfrom_args /* {
int s;
caddr_t buf;
size_t len;
int flags;
struct sockaddr * __restrict from;
socklen_t * __restrict fromlenaddr;
} */ bsd_args;
size_t len;
int error;
if ((error = copyin(PTRIN(args->fromlen), &len, sizeof(size_t))))
return (error);
bsd_args.s = args->s;
bsd_args.buf = PTRIN(args->buf);
bsd_args.len = args->len;
bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
/* XXX: */
bsd_args.from = (struct sockaddr * __restrict)PTRIN(args->from);
bsd_args.fromlenaddr = PTRIN(args->fromlen);/* XXX */
linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.from, len);
error = sys_recvfrom(td, &bsd_args);
bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.from);
if (error)
return (error);
if (args->from) {
error = linux_sa_put((struct osockaddr *)
PTRIN(args->from));
if (error)
return (error);
}
return (0);
}
struct linux_sendmsg_args {
int s;
l_uintptr_t msg;
int flags;
};
static int
linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
{
struct cmsghdr *cmsg;
struct cmsgcred cmcred;
struct mbuf *control;
struct msghdr msg;
struct l_cmsghdr linux_cmsg;
struct l_cmsghdr *ptr_cmsg;
struct l_msghdr linux_msg;
struct iovec *iov;
socklen_t datalen;
struct sockaddr *sa;
sa_family_t sa_family;
void *data;
int error;
error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
if (error)
return (error);
/*
* Some Linux applications (ping) define a non-NULL control data
* pointer, but a msg_controllen of 0, which is not allowed in the
* FreeBSD system call interface. NULL the msg_control pointer in
* order to handle this case. This should be checked, but allows the
* Linux ping to work.
*/
if (PTRIN(linux_msg.msg_control) != NULL && linux_msg.msg_controllen == 0)
linux_msg.msg_control = PTROUT(NULL);
error = linux_to_bsd_msghdr(&msg, &linux_msg);
if (error)
return (error);
#ifdef COMPAT_LINUX32
error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
&iov, EMSGSIZE);
#else
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
#endif
if (error)
return (error);
control = NULL;
cmsg = NULL;
if ((ptr_cmsg = LINUX_CMSG_FIRSTHDR(&linux_msg)) != NULL) {
error = kern_getsockname(td, args->s, &sa, &datalen);
if (error)
goto bad;
sa_family = sa->sa_family;
free(sa, M_SONAME);
error = ENOBUFS;
cmsg = malloc(CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
control = m_get(M_WAITOK, MT_CONTROL);
if (control == NULL)
goto bad;
do {
error = copyin(ptr_cmsg, &linux_cmsg,
sizeof(struct l_cmsghdr));
if (error)
goto bad;
error = EINVAL;
if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr))
goto bad;
/*
* Now we support only SCM_RIGHTS and SCM_CRED,
* so return EINVAL in any other cmsg_type
*/
cmsg->cmsg_type =
linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
cmsg->cmsg_level =
linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
if (cmsg->cmsg_type == -1
|| cmsg->cmsg_level != SOL_SOCKET)
goto bad;
/*
* Some applications (e.g. pulseaudio) attempt to
* send ancillary data even if the underlying protocol
* doesn't support it which is not allowed in the
* FreeBSD system call interface.
*/
if (sa_family != AF_UNIX)
continue;
data = LINUX_CMSG_DATA(ptr_cmsg);
datalen = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
switch (cmsg->cmsg_type)
{
case SCM_RIGHTS:
break;
case SCM_CREDS:
data = &cmcred;
datalen = sizeof(cmcred);
/*
* The lower levels will fill in the structure
*/
bzero(data, datalen);
break;
}
cmsg->cmsg_len = CMSG_LEN(datalen);
error = ENOBUFS;
if (!m_append(control, CMSG_HDRSZ, (c_caddr_t)cmsg))
goto bad;
if (!m_append(control, datalen, (c_caddr_t)data))
goto bad;
} while ((ptr_cmsg = LINUX_CMSG_NXTHDR(&linux_msg, ptr_cmsg)));
if (m_length(control, NULL) == 0) {
m_freem(control);
control = NULL;
}
}
msg.msg_iov = iov;
msg.msg_flags = 0;
error = linux_sendit(td, args->s, &msg, args->flags, control,
UIO_USERSPACE);
bad:
free(iov, M_IOV);
if (cmsg)
free(cmsg, M_TEMP);
return (error);
}
struct linux_recvmsg_args {
int s;
l_uintptr_t msg;
int flags;
};
static int
linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
{
struct cmsghdr *cm;
struct cmsgcred *cmcred;
struct msghdr msg;
struct l_cmsghdr *linux_cmsg = NULL;
struct l_ucred linux_ucred;
socklen_t datalen, outlen;
struct l_msghdr linux_msg;
struct iovec *iov, *uiov;
struct mbuf *control = NULL;
struct mbuf **controlp;
caddr_t outbuf;
void *data;
int error, i, fd, fds, *fdp;
error = copyin(PTRIN(args->msg), &linux_msg, sizeof(linux_msg));
if (error)
return (error);
error = linux_to_bsd_msghdr(&msg, &linux_msg);
if (error)
return (error);
#ifdef COMPAT_LINUX32
error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
&iov, EMSGSIZE);
#else
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
#endif
if (error)
return (error);
if (msg.msg_name) {
error = linux_to_bsd_sockaddr((struct sockaddr *)msg.msg_name,
msg.msg_namelen);
if (error)
goto bad;
}
uiov = msg.msg_iov;
msg.msg_iov = iov;
controlp = (msg.msg_control != NULL) ? &control : NULL;
error = kern_recvit(td, args->s, &msg, UIO_USERSPACE, controlp);
msg.msg_iov = uiov;
if (error)
goto bad;
error = bsd_to_linux_msghdr(&msg, &linux_msg);
if (error)
goto bad;
if (linux_msg.msg_name) {
error = bsd_to_linux_sockaddr((struct sockaddr *)
PTRIN(linux_msg.msg_name));
if (error)
goto bad;
}
if (linux_msg.msg_name && linux_msg.msg_namelen > 2) {
error = linux_sa_put(PTRIN(linux_msg.msg_name));
if (error)
goto bad;
}
outbuf = PTRIN(linux_msg.msg_control);
outlen = 0;
if (control) {
linux_cmsg = malloc(L_CMSG_HDRSZ, M_TEMP, M_WAITOK | M_ZERO);
msg.msg_control = mtod(control, struct cmsghdr *);
msg.msg_controllen = control->m_len;
cm = CMSG_FIRSTHDR(&msg);
while (cm != NULL) {
linux_cmsg->cmsg_type =
bsd_to_linux_cmsg_type(cm->cmsg_type);
linux_cmsg->cmsg_level =
bsd_to_linux_sockopt_level(cm->cmsg_level);
if (linux_cmsg->cmsg_type == -1
|| cm->cmsg_level != SOL_SOCKET)
{
error = EINVAL;
goto bad;
}
data = CMSG_DATA(cm);
datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
switch (cm->cmsg_type)
{
case SCM_RIGHTS:
if (args->flags & LINUX_MSG_CMSG_CLOEXEC) {
fds = datalen / sizeof(int);
fdp = data;
for (i = 0; i < fds; i++) {
fd = *fdp++;
(void)kern_fcntl(td, fd,
F_SETFD, FD_CLOEXEC);
}
}
break;
case SCM_CREDS:
/*
* Currently LOCAL_CREDS is never in
* effect for Linux so no need to worry
* about sockcred
*/
if (datalen != sizeof(*cmcred)) {
error = EMSGSIZE;
goto bad;
}
cmcred = (struct cmsgcred *)data;
bzero(&linux_ucred, sizeof(linux_ucred));
linux_ucred.pid = cmcred->cmcred_pid;
linux_ucred.uid = cmcred->cmcred_uid;
linux_ucred.gid = cmcred->cmcred_gid;
data = &linux_ucred;
datalen = sizeof(linux_ucred);
break;
}
if (outlen + LINUX_CMSG_LEN(datalen) >
linux_msg.msg_controllen) {
if (outlen == 0) {
error = EMSGSIZE;
goto bad;
} else {
linux_msg.msg_flags |=
LINUX_MSG_CTRUNC;
goto out;
}
}
linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
if (error)
goto bad;
outbuf += L_CMSG_HDRSZ;
error = copyout(data, outbuf, datalen);
if (error)
goto bad;
outbuf += LINUX_CMSG_ALIGN(datalen);
outlen += LINUX_CMSG_LEN(datalen);
cm = CMSG_NXTHDR(&msg, cm);
}
}
out:
linux_msg.msg_controllen = outlen;
error = copyout(&linux_msg, PTRIN(args->msg), sizeof(linux_msg));
bad:
free(iov, M_IOV);
m_freem(control);
free(linux_cmsg, M_TEMP);
return (error);
}
struct linux_shutdown_args {
int s;
int how;
};
static int
linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
{
struct shutdown_args /* {
int s;
int how;
} */ bsd_args;
bsd_args.s = args->s;
bsd_args.how = args->how;
return (sys_shutdown(td, &bsd_args));
}
struct linux_setsockopt_args {
int s;
int level;
int optname;
l_uintptr_t optval;
int optlen;
};
static int
linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
{
struct setsockopt_args /* {
int s;
int level;
int name;
caddr_t val;
int valsize;
} */ bsd_args;
l_timeval linux_tv;
struct timeval tv;
int error, name;
bsd_args.s = args->s;
bsd_args.level = linux_to_bsd_sockopt_level(args->level);
switch (bsd_args.level) {
case SOL_SOCKET:
name = linux_to_bsd_so_sockopt(args->optname);
switch (name) {
case SO_RCVTIMEO:
/* FALLTHROUGH */
case SO_SNDTIMEO:
error = copyin(PTRIN(args->optval), &linux_tv,
sizeof(linux_tv));
if (error)
return (error);
tv.tv_sec = linux_tv.tv_sec;
tv.tv_usec = linux_tv.tv_usec;
return (kern_setsockopt(td, args->s, bsd_args.level,
name, &tv, UIO_SYSSPACE, sizeof(tv)));
/* NOTREACHED */
break;
default:
break;
}
break;
case IPPROTO_IP:
name = linux_to_bsd_ip_sockopt(args->optname);
break;
case IPPROTO_TCP:
name = linux_to_bsd_tcp_sockopt(args->optname);
break;
default:
name = -1;
break;
}
if (name == -1)
return (ENOPROTOOPT);
bsd_args.name = name;
bsd_args.val = PTRIN(args->optval);
bsd_args.valsize = args->optlen;
if (name == IPV6_NEXTHOP) {
linux_to_bsd_sockaddr((struct sockaddr *)bsd_args.val,
bsd_args.valsize);
error = sys_setsockopt(td, &bsd_args);
bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
} else
error = sys_setsockopt(td, &bsd_args);
return (error);
}
struct linux_getsockopt_args {
int s;
int level;
int optname;
l_uintptr_t optval;
l_uintptr_t optlen;
};
static int
linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
{
struct getsockopt_args /* {
int s;
int level;
int name;
caddr_t val;
int *avalsize;
} */ bsd_args;
l_timeval linux_tv;
struct timeval tv;
socklen_t tv_len, xulen;
struct xucred xu;
struct l_ucred lxu;
int error, name;
bsd_args.s = args->s;
bsd_args.level = linux_to_bsd_sockopt_level(args->level);
switch (bsd_args.level) {
case SOL_SOCKET:
name = linux_to_bsd_so_sockopt(args->optname);
switch (name) {
case SO_RCVTIMEO:
/* FALLTHROUGH */
case SO_SNDTIMEO:
tv_len = sizeof(tv);
error = kern_getsockopt(td, args->s, bsd_args.level,
name, &tv, UIO_SYSSPACE, &tv_len);
if (error)
return (error);
linux_tv.tv_sec = tv.tv_sec;
linux_tv.tv_usec = tv.tv_usec;
return (copyout(&linux_tv, PTRIN(args->optval),
sizeof(linux_tv)));
/* NOTREACHED */
break;
case LOCAL_PEERCRED:
if (args->optlen != sizeof(lxu))
return (EINVAL);
xulen = sizeof(xu);
error = kern_getsockopt(td, args->s, bsd_args.level,
name, &xu, UIO_SYSSPACE, &xulen);
if (error)
return (error);
/*
* XXX Use 0 for pid as the FreeBSD does not cache peer pid.
*/
lxu.pid = 0;
lxu.uid = xu.cr_uid;
lxu.gid = xu.cr_gid;
return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
/* NOTREACHED */
break;
default:
break;
}
break;
case IPPROTO_IP:
name = linux_to_bsd_ip_sockopt(args->optname);
break;
case IPPROTO_TCP:
name = linux_to_bsd_tcp_sockopt(args->optname);
break;
default:
name = -1;
break;
}
if (name == -1)
return (EINVAL);
bsd_args.name = name;
bsd_args.val = PTRIN(args->optval);
bsd_args.avalsize = PTRIN(args->optlen);
if (name == IPV6_NEXTHOP) {
error = sys_getsockopt(td, &bsd_args);
bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.val);
} else
error = sys_getsockopt(td, &bsd_args);
return (error);
}
/* Argument list sizes for linux_socketcall */
#define LINUX_AL(x) ((x) * sizeof(l_ulong))
static const unsigned char lxs_args[] = {
LINUX_AL(0) /* unused*/, LINUX_AL(3) /* socket */,
LINUX_AL(3) /* bind */, LINUX_AL(3) /* connect */,
LINUX_AL(2) /* listen */, LINUX_AL(3) /* accept */,
LINUX_AL(3) /* getsockname */, LINUX_AL(3) /* getpeername */,
LINUX_AL(4) /* socketpair */, LINUX_AL(4) /* send */,
LINUX_AL(4) /* recv */, LINUX_AL(6) /* sendto */,
LINUX_AL(6) /* recvfrom */, LINUX_AL(2) /* shutdown */,
LINUX_AL(5) /* setsockopt */, LINUX_AL(5) /* getsockopt */,
LINUX_AL(3) /* sendmsg */, LINUX_AL(3) /* recvmsg */,
LINUX_AL(4) /* accept4 */
};
#define LINUX_AL_SIZE sizeof(lxs_args) / sizeof(lxs_args[0]) - 1
int
linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
{
l_ulong a[6];
void *arg;
int error;
if (args->what < LINUX_SOCKET || args->what > LINUX_AL_SIZE)
return (EINVAL);
error = copyin(PTRIN(args->args), a, lxs_args[args->what]);
if (error)
return (error);
arg = a;
switch (args->what) {
case LINUX_SOCKET:
return (linux_socket(td, arg));
case LINUX_BIND:
return (linux_bind(td, arg));
case LINUX_CONNECT:
return (linux_connect(td, arg));
case LINUX_LISTEN:
return (linux_listen(td, arg));
case LINUX_ACCEPT:
return (linux_accept(td, arg));
case LINUX_GETSOCKNAME:
return (linux_getsockname(td, arg));
case LINUX_GETPEERNAME:
return (linux_getpeername(td, arg));
case LINUX_SOCKETPAIR:
return (linux_socketpair(td, arg));
case LINUX_SEND:
return (linux_send(td, arg));
case LINUX_RECV:
return (linux_recv(td, arg));
case LINUX_SENDTO:
return (linux_sendto(td, arg));
case LINUX_RECVFROM:
return (linux_recvfrom(td, arg));
case LINUX_SHUTDOWN:
return (linux_shutdown(td, arg));
case LINUX_SETSOCKOPT:
return (linux_setsockopt(td, arg));
case LINUX_GETSOCKOPT:
return (linux_getsockopt(td, arg));
case LINUX_SENDMSG:
return (linux_sendmsg(td, arg));
case LINUX_RECVMSG:
return (linux_recvmsg(td, arg));
case LINUX_ACCEPT4:
return (linux_accept4(td, arg));
}
uprintf("LINUX: 'socket' typ=%d not implemented\n", args->what);
return (ENOSYS);
}
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