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freebsd-src/sys/netinet/sctp_syscalls.c
Kyle Evans 47ad4f2d45 ktrace: log genio events on failed write 
Visibility into the contents of the buffer when a write(2) has failed
can be immensely useful in debugging IPC issues -- pushing this to
discuss the idea, or maybe an alternative where we can set a flag like
KTRFAC_ERRIO to enable it.

When a genio event is potentially raised after an error, currently we'll
just free the uio and return.  However, such data can be useful when
debugging communication between processes to, e.g., understand what the
remote side should have grabbed before closing a pipe.  Tap out the
entire buffer on failure rather than simply discarding it.

Reviewed by:	kib, markj
Differential Revision:	https://reviews.freebsd.org/D43799
2024-03-04 23:44:09 -06:00

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/*-
* Copyright (c) 1982, 1986, 1989, 1990, 1993
* The Regents of the University of California. 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.
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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>
#include "opt_capsicum.h"
#include "opt_sctp.h"
#include "opt_ktrace.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/capsicum.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysproto.h>
#include <sys/malloc.h>
#include <sys/filedesc.h>
#include <sys/event.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filio.h>
#include <sys/jail.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/sf_buf.h>
#include <sys/sysent.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/signalvar.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#ifdef COMPAT_FREEBSD32
#include <compat/freebsd32/freebsd32.h>
#include <compat/freebsd32/freebsd32_syscall.h>
#include <compat/freebsd32/freebsd32_util.h>
#endif
#include <net/vnet.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
#include <netinet/sctp.h>
#include <netinet/sctp_os_bsd.h>
#include <netinet/sctp_peeloff.h>
static struct syscall_helper_data sctp_syscalls[] = {
SYSCALL_INIT_HELPER_F(sctp_peeloff, SYF_CAPENABLED),
SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED),
SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED),
SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED),
SYSCALL_INIT_LAST
};
#ifdef COMPAT_FREEBSD32
static struct syscall_helper_data sctp32_syscalls[] = {
SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff),
SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg),
SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov),
SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg),
SYSCALL_INIT_LAST
};
#endif
int
sctp_syscalls_init(void)
{
int error;
error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD);
if (error != 0)
return (error);
#ifdef COMPAT_FREEBSD32
error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD);
if (error != 0)
return (error);
#endif
return (0);
}
#ifdef SCTP
SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL);
#endif
int
sctp_syscalls_uninit(void)
{
int error;
#ifdef COMPAT_FREEBSD32
error = syscall32_helper_unregister(sctp32_syscalls);
if (error != 0)
return (error);
#endif
error = syscall_helper_unregister(sctp_syscalls);
if (error != 0)
return (error);
return (0);
}
/*
* SCTP syscalls.
*/
int
sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap)
{
struct file *headfp, *nfp = NULL;
struct socket *head, *so;
cap_rights_t rights;
u_int fflag;
int error, fd;
AUDIT_ARG_FD(uap->sd);
error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_PEELOFF),
&headfp);
if (error != 0)
goto done2;
fflag = atomic_load_int(&headfp->f_flag);
head = headfp->f_data;
if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
error = EOPNOTSUPP;
goto done;
}
error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
if (error != 0)
goto done;
/*
* At this point we know we do have a assoc to pull
* we proceed to get the fd setup. This may block
* but that is ok.
*/
error = falloc(td, &nfp, &fd, 0);
if (error != 0)
goto done;
td->td_retval[0] = fd;
CURVNET_SET(head->so_vnet);
so = sopeeloff(head);
if (so == NULL) {
error = ENOMEM;
goto noconnection;
}
finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
if (error != 0)
goto noconnection;
if (head->so_sigio != NULL)
fsetown(fgetown(&head->so_sigio), &so->so_sigio);
noconnection:
/*
* close the new descriptor, assuming someone hasn't ripped it
* out from under us.
*/
if (error != 0)
fdclose(td, nfp, fd);
/*
* Release explicitly held references before returning.
*/
CURVNET_RESTORE();
done:
if (nfp != NULL)
fdrop(nfp, td);
fdrop(headfp, td);
done2:
return (error);
}
int
sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap)
{
struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
struct socket *so;
struct file *fp = NULL;
struct sockaddr *to = NULL;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
struct uio auio;
struct iovec iov[1];
cap_rights_t rights;
int error = 0, len;
if (uap->sinfo != NULL) {
error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
if (error != 0)
return (error);
u_sinfo = &sinfo;
}
cap_rights_init_one(&rights, CAP_SEND);
if (uap->tolen != 0) {
error = getsockaddr(&to, uap->to, uap->tolen);
if (error != 0) {
to = NULL;
goto sctp_bad2;
}
cap_rights_set_one(&rights, CAP_CONNECT);
}
AUDIT_ARG_FD(uap->sd);
error = getsock(td, uap->sd, &rights, &fp);
if (error != 0)
goto sctp_bad;
#ifdef KTRACE
if (to && (KTRPOINT(td, KTR_STRUCT)))
ktrsockaddr(to);
#endif
iov[0].iov_base = uap->msg;
iov[0].iov_len = uap->mlen;
so = (struct socket *)fp->f_data;
if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
error = EOPNOTSUPP;
goto sctp_bad;
}
#ifdef MAC
error = mac_socket_check_send(td->td_ucred, so);
if (error != 0)
goto sctp_bad;
#endif /* MAC */
auio.uio_iov = iov;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO))
ktruio = cloneuio(&auio);
#endif /* KTRACE */
len = auio.uio_resid = uap->mlen;
CURVNET_SET(so->so_vnet);
error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
(struct mbuf *)NULL, uap->flags, u_sinfo, td);
CURVNET_RESTORE();
if (error != 0) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
/* Generation of SIGPIPE can be controlled per socket. */
if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
!(uap->flags & MSG_NOSIGNAL)) {
PROC_LOCK(td->td_proc);
tdsignal(td, SIGPIPE);
PROC_UNLOCK(td->td_proc);
}
}
if (error == 0)
td->td_retval[0] = len - auio.uio_resid;
#ifdef KTRACE
if (ktruio != NULL) {
if (error == 0)
ktruio->uio_resid = td->td_retval[0];
ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
}
#endif /* KTRACE */
sctp_bad:
if (fp != NULL)
fdrop(fp, td);
sctp_bad2:
free(to, M_SONAME);
return (error);
}
int
sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap)
{
struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
struct socket *so;
struct file *fp = NULL;
struct sockaddr *to = NULL;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
struct uio auio;
struct iovec *iov, *tiov;
cap_rights_t rights;
ssize_t len;
int error, i;
if (uap->sinfo != NULL) {
error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
if (error != 0)
return (error);
u_sinfo = &sinfo;
}
cap_rights_init_one(&rights, CAP_SEND);
if (uap->tolen != 0) {
error = getsockaddr(&to, uap->to, uap->tolen);
if (error != 0) {
to = NULL;
goto sctp_bad2;
}
cap_rights_set_one(&rights, CAP_CONNECT);
}
AUDIT_ARG_FD(uap->sd);
error = getsock(td, uap->sd, &rights, &fp);
if (error != 0)
goto sctp_bad1;
#ifdef COMPAT_FREEBSD32
if (SV_CURPROC_FLAG(SV_ILP32))
error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
uap->iovlen, &iov, EMSGSIZE);
else
#endif
error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
if (error != 0)
goto sctp_bad1;
#ifdef KTRACE
if (to && (KTRPOINT(td, KTR_STRUCT)))
ktrsockaddr(to);
#endif
so = (struct socket *)fp->f_data;
if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
error = EOPNOTSUPP;
goto sctp_bad;
}
#ifdef MAC
error = mac_socket_check_send(td->td_ucred, so);
if (error != 0)
goto sctp_bad;
#endif /* MAC */
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
tiov = iov;
for (i = 0; i <uap->iovlen; i++, tiov++) {
if ((auio.uio_resid += tiov->iov_len) < 0) {
error = EINVAL;
goto sctp_bad;
}
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO))
ktruio = cloneuio(&auio);
#endif /* KTRACE */
len = auio.uio_resid;
CURVNET_SET(so->so_vnet);
error = sctp_lower_sosend(so, to, &auio,
(struct mbuf *)NULL, (struct mbuf *)NULL,
uap->flags, u_sinfo, td);
CURVNET_RESTORE();
if (error != 0) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
/* Generation of SIGPIPE can be controlled per socket */
if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
!(uap->flags & MSG_NOSIGNAL)) {
PROC_LOCK(td->td_proc);
tdsignal(td, SIGPIPE);
PROC_UNLOCK(td->td_proc);
}
}
if (error == 0)
td->td_retval[0] = len - auio.uio_resid;
#ifdef KTRACE
if (ktruio != NULL) {
if (error == 0)
ktruio->uio_resid = td->td_retval[0];
ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
}
#endif /* KTRACE */
sctp_bad:
free(iov, M_IOV);
sctp_bad1:
if (fp != NULL)
fdrop(fp, td);
sctp_bad2:
free(to, M_SONAME);
return (error);
}
int
sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap)
{
uint8_t sockbufstore[256];
struct uio auio;
struct iovec *iov, *tiov;
struct sctp_sndrcvinfo sinfo;
struct socket *so;
struct file *fp = NULL;
struct sockaddr *fromsa;
cap_rights_t rights;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
ssize_t len;
int error, fromlen, i, msg_flags;
AUDIT_ARG_FD(uap->sd);
error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV),
&fp);
if (error != 0)
return (error);
#ifdef COMPAT_FREEBSD32
if (SV_CURPROC_FLAG(SV_ILP32))
error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
uap->iovlen, &iov, EMSGSIZE);
else
#endif
error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
if (error != 0)
goto out1;
so = fp->f_data;
if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
error = EOPNOTSUPP;
goto out;
}
#ifdef MAC
error = mac_socket_check_receive(td->td_ucred, so);
if (error != 0)
goto out;
#endif /* MAC */
if (uap->fromlenaddr != NULL) {
error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
if (error != 0)
goto out;
} else {
fromlen = 0;
}
if (uap->msg_flags) {
error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
if (error != 0)
goto out;
} else {
msg_flags = 0;
}
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_READ;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
tiov = iov;
for (i = 0; i <uap->iovlen; i++, tiov++) {
if ((auio.uio_resid += tiov->iov_len) < 0) {
error = EINVAL;
goto out;
}
}
len = auio.uio_resid;
fromsa = (struct sockaddr *)sockbufstore;
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO))
ktruio = cloneuio(&auio);
#endif /* KTRACE */
memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
CURVNET_SET(so->so_vnet);
error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
fromsa, fromlen, &msg_flags,
(struct sctp_sndrcvinfo *)&sinfo, 1);
CURVNET_RESTORE();
if (error != 0) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
} else {
if (uap->sinfo)
error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
}
#ifdef KTRACE
if (ktruio != NULL) {
ktruio->uio_resid = len - auio.uio_resid;
ktrgenio(uap->sd, UIO_READ, ktruio, error);
}
#endif /* KTRACE */
if (error != 0)
goto out;
td->td_retval[0] = len - auio.uio_resid;
if (fromlen && uap->from) {
len = fromlen;
if (len <= 0 || fromsa == NULL)
len = 0;
else {
len = MIN(len, fromsa->sa_len);
error = copyout(fromsa, uap->from, (size_t)len);
if (error != 0)
goto out;
}
error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
if (error != 0)
goto out;
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_STRUCT))
ktrsockaddr(fromsa);
#endif
if (uap->msg_flags) {
error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
if (error != 0)
goto out;
}
out:
free(iov, M_IOV);
out1:
if (fp != NULL)
fdrop(fp, td);
return (error);
}
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