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📄 igmp.c(98.93 KB)
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📄 in_mcast.c(79.22 KB)
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📄 in_pcb.h(34.46 KB)
📄 in_pcbgroup.c(17.28 KB)
📄 in_prot.c(2.35 KB)
📄 in_proto.c(9.36 KB)
📄 in_rmx.c(4.99 KB)
📄 in_rss.c(11.27 KB)
📄 in_rss.h(2.42 KB)
📄 in_systm.h(2.57 KB)
📄 in_var.h(15.4 KB)
📄 ip.h(7.37 KB)
📄 ip6.h(8.93 KB)
📄 ip_carp.c(53.25 KB)
📄 ip_carp.h(6.79 KB)
📄 ip_divert.c(21.74 KB)
📄 ip_divert.h(2.32 KB)
📄 ip_dummynet.h(8.94 KB)
📄 ip_ecn.c(5.83 KB)
📄 ip_ecn.h(2.1 KB)
📄 ip_encap.c(10.59 KB)
📄 ip_encap.h(3.13 KB)
📄 ip_fastfwd.c(13.79 KB)
📄 ip_fw.h(34.29 KB)
📄 ip_gre.c(15.28 KB)
📄 ip_icmp.c(31.15 KB)
📄 ip_icmp.h(8.52 KB)
📄 ip_id.c(9.78 KB)
📄 ip_input.c(37.16 KB)
📄 ip_mroute.c(75.86 KB)
📄 ip_mroute.h(13.66 KB)
📄 ip_options.c(19.9 KB)
📄 ip_options.h(2.61 KB)
📄 ip_output.c(40.67 KB)
📄 ip_reass.c(22.42 KB)
📄 ip_var.h(11.48 KB)
📁 khelp
📁 libalias
📁 netdump
📄 pim.h(4.25 KB)
📄 pim_var.h(3.14 KB)
📄 raw_ip.c(28.58 KB)
📄 sctp.h(22.97 KB)
📄 sctp_asconf.c(100.05 KB)
📄 sctp_asconf.h(3.31 KB)
📄 sctp_auth.c(50.44 KB)
📄 sctp_auth.h(8.52 KB)
📄 sctp_bsd_addr.c(13.89 KB)
📄 sctp_bsd_addr.h(2.45 KB)
📄 sctp_cc_functions.c(68.75 KB)
📄 sctp_constants.h(34.12 KB)
📄 sctp_crc32.c(4.5 KB)
📄 sctp_crc32.h(2.07 KB)
📄 sctp_header.h(17.48 KB)
📄 sctp_indata.c(175.36 KB)
📄 sctp_indata.h(4.18 KB)
📄 sctp_input.c(183.57 KB)
📄 sctp_input.h(2.43 KB)
📄 sctp_kdtrace.c(7.51 KB)
📄 sctp_kdtrace.h(3.6 KB)
📄 sctp_lock_bsd.h(15.64 KB)
📄 sctp_module.c(5.16 KB)
📄 sctp_os.h(2.73 KB)
📄 sctp_os_bsd.h(15.04 KB)
📄 sctp_output.c(362.89 KB)
📄 sctp_output.h(6.38 KB)
📄 sctp_pcb.c(198.87 KB)
📄 sctp_pcb.h(19.31 KB)
📄 sctp_peeloff.c(5.74 KB)
📄 sctp_peeloff.h(2.05 KB)
📄 sctp_ss_functions.c(30.72 KB)
📄 sctp_structs.h(38.29 KB)
📄 sctp_syscalls.c(13.94 KB)
📄 sctp_sysctl.c(37.45 KB)
📄 sctp_sysctl.h(22.9 KB)
📄 sctp_timer.c(47.92 KB)
📄 sctp_timer.h(3.07 KB)
📄 sctp_uio.h(38.07 KB)
📄 sctp_usrreq.c(216.08 KB)
📄 sctp_var.h(12.21 KB)
📄 sctputil.c(212.13 KB)
📄 sctputil.h(11.69 KB)
📄 siftr.c(45.2 KB)
📄 tcp.h(18.3 KB)
📄 tcp_debug.c(5.9 KB)
📄 tcp_debug.h(2.65 KB)
📄 tcp_fastopen.c(37.98 KB)
📄 tcp_fastopen.h(3.7 KB)
📄 tcp_fsm.h(4.25 KB)
📄 tcp_hostcache.c(21.43 KB)
📄 tcp_hostcache.h(2.92 KB)
📄 tcp_hpts.c(57.55 KB)
📄 tcp_hpts.h(9.89 KB)
📄 tcp_input.c(115.95 KB)
📄 tcp_log_buf.c(76.37 KB)
📄 tcp_log_buf.h(14.88 KB)
📄 tcp_lro.c(36.38 KB)
📄 tcp_lro.h(4.43 KB)
📄 tcp_offload.c(5.48 KB)
📄 tcp_offload.h(2.09 KB)
📄 tcp_output.c(60.16 KB)
📄 tcp_pcap.c(12.67 KB)
📄 tcp_pcap.h(1.76 KB)
📄 tcp_ratelimit.c(43.8 KB)
📄 tcp_ratelimit.h(5.07 KB)
📄 tcp_reass.c(30.75 KB)
📄 tcp_sack.c(26.74 KB)
📄 tcp_seq.h(3.57 KB)
📁 tcp_stacks
📄 tcp_stats.c(8.47 KB)
📄 tcp_subr.c(92.74 KB)
📄 tcp_syncache.c(73 KB)
📄 tcp_syncache.h(5.16 KB)
📄 tcp_timer.c(31.04 KB)
📄 tcp_timer.h(9.29 KB)
📄 tcp_timewait.c(19.06 KB)
📄 tcp_usrreq.c(71.35 KB)
📄 tcp_var.h(43.48 KB)
📄 tcpip.h(2.29 KB)
📄 toecore.c(13.51 KB)
📄 toecore.h(5.13 KB)
📄 udp.h(2.49 KB)
📄 udp_usrreq.c(44.57 KB)
📄 udp_var.h(6.48 KB)
📄 udplite.h(1.91 KB)

Editing: sctp_syscalls.c

/*-
 * 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>
__FBSDID("$FreeBSD$");

#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(td, uap)
	struct thread *td;
	struct sctp_peeloff_args /* {
		int	sd;
		caddr_t	name;
	} */ *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_cap(td, uap->sd, cap_rights_init_one(&rights, CAP_PEELOFF),
	    &headfp, &fflag, NULL);
	if (error != 0)
		goto done2;
	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 (td, uap)
	struct thread *td;
	struct sctp_generic_sendmsg_args /* {
		int sd,
		caddr_t msg,
		int mlen,
		caddr_t to,
		__socklen_t tolen,
		struct sctp_sndrcvinfo *sinfo,
		int flags
	} */ *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_cap(td, uap->sd, &rights, &fp, NULL, NULL);
	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) {
		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(td, uap)
	struct thread *td;
	struct sctp_generic_sendmsg_iov_args /* {
		int sd,
		struct iovec *iov,
		int iovlen,
		caddr_t to,
		__socklen_t tolen,
		struct sctp_sndrcvinfo *sinfo,
		int flags
	} */ *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_cap(td, uap->sd, &rights, &fp, NULL, NULL);
	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

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) {
		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(td, uap)
	struct thread *td;
	struct sctp_generic_recvmsg_args /* {
		int sd,
		struct iovec *iov,
		int iovlen,
		struct sockaddr *from,
		__socklen_t *fromlenaddr,
		struct sctp_sndrcvinfo *sinfo,
		int *msg_flags
	} */ *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_cap(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV),
	    &fp, NULL, NULL);
	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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Editing: sctp_syscalls.c

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