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📄 if_ether.c(41.26 KB)
📄 if_ether.h(4.62 KB)
📄 igmp.c(98.93 KB)
📄 igmp.h(5.36 KB)
📄 igmp_var.h(8.69 KB)
📄 in.c(43.68 KB)
📄 in.h(25.81 KB)
📄 in_cksum.c(4.09 KB)
📄 in_debug.c(3.48 KB)
📄 in_fib.c(8.62 KB)
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📄 in_kdtrace.h(3.31 KB)
📄 in_mcast.c(79.22 KB)
📄 in_pcb.c(90.89 KB)
📄 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
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📄 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_bsd_addr.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) 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.
 *
 * c) Neither the name of Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <netinet/sctp_os.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_indata.h>
#include <sys/unistd.h>

/* Declare all of our malloc named types */
MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor");
MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array");
MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array");
MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address");
MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator");
MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist");
MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key");
MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list");
MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info");
MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset");
MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer");
MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all");
MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct");
MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct");
MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct");
MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");
MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");
MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue");

/* Global NON-VNET structure that controls the iterator */
struct iterator_control sctp_it_ctl;

void
sctp_wakeup_iterator(void)
{
	wakeup(&sctp_it_ctl.iterator_running);
}

static void
sctp_iterator_thread(void *v SCTP_UNUSED)
{
	SCTP_IPI_ITERATOR_WQ_LOCK();
	/* In FreeBSD this thread never terminates. */
	for (;;) {
		msleep(&sctp_it_ctl.iterator_running,
		    &sctp_it_ctl.ipi_iterator_wq_mtx,
		    0, "waiting_for_work", 0);
		sctp_iterator_worker();
	}
}

void
sctp_startup_iterator(void)
{
	if (sctp_it_ctl.thread_proc) {
		/* You only get one */
		return;
	}
	/* Initialize global locks here, thus only once. */
	SCTP_ITERATOR_LOCK_INIT();
	SCTP_IPI_ITERATOR_WQ_INIT();
	TAILQ_INIT(&sctp_it_ctl.iteratorhead);
	kproc_create(sctp_iterator_thread,
	    (void *)NULL,
	    &sctp_it_ctl.thread_proc,
	    RFPROC,
	    SCTP_KTHREAD_PAGES,
	    SCTP_KTRHEAD_NAME);
}

#ifdef INET6

void
sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
{
	struct in6_ifaddr *ifa6;

ifa6 = (struct in6_ifaddr *)ifa->ifa;
	ifa->flags = ifa6->ia6_flags;
	if (!MODULE_GLOBAL(ip6_use_deprecated)) {
		if (ifa->flags &
		    IN6_IFF_DEPRECATED) {
			ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
		} else {
			ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
		}
	} else {
		ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
	}
	if (ifa->flags &
	    (IN6_IFF_DETACHED |
	    IN6_IFF_ANYCAST |
	    IN6_IFF_NOTREADY)) {
		ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
	} else {
		ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
	}
}
#endif				/* INET6 */

static uint32_t
sctp_is_desired_interface_type(struct ifnet *ifn)
{
	int result;

/* check the interface type to see if it's one we care about */
	switch (ifn->if_type) {
	case IFT_ETHER:
	case IFT_ISO88023:
	case IFT_ISO88024:
	case IFT_ISO88025:
	case IFT_ISO88026:
	case IFT_STARLAN:
	case IFT_P10:
	case IFT_P80:
	case IFT_HY:
	case IFT_FDDI:
	case IFT_XETHER:
	case IFT_ISDNBASIC:
	case IFT_ISDNPRIMARY:
	case IFT_PTPSERIAL:
	case IFT_OTHER:
	case IFT_PPP:
	case IFT_LOOP:
	case IFT_SLIP:
	case IFT_GIF:
	case IFT_L2VLAN:
	case IFT_STF:
	case IFT_IP:
	case IFT_IPOVERCDLC:
	case IFT_IPOVERCLAW:
	case IFT_PROPVIRTUAL:	/* NetGraph Virtual too */
	case IFT_VIRTUALIPADDRESS:
		result = 1;
		break;
	default:
		result = 0;
	}

return (result);
}

static void
sctp_init_ifns_for_vrf(int vrfid)
{
	/*
	 * Here we must apply ANY locks needed by the IFN we access and also
	 * make sure we lock any IFA that exists as we float through the
	 * list of IFA's
	 */
	struct epoch_tracker et;
	struct ifnet *ifn;
	struct ifaddr *ifa;
	struct sctp_ifa *sctp_ifa;
	uint32_t ifa_flags;
#ifdef INET6
	struct in6_ifaddr *ifa6;
#endif

IFNET_RLOCK();
	NET_EPOCH_ENTER(et);
	CK_STAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_link) {
		if (sctp_is_desired_interface_type(ifn) == 0) {
			/* non desired type */
			continue;
		}
		CK_STAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
			if (ifa->ifa_addr == NULL) {
				continue;
			}
			switch (ifa->ifa_addr->sa_family) {
#ifdef INET
			case AF_INET:
				if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
					continue;
				}
				break;
#endif
#ifdef INET6
			case AF_INET6:
				if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
					/* skip unspecifed addresses */
					continue;
				}
				break;
#endif
			default:
				continue;
			}
			switch (ifa->ifa_addr->sa_family) {
#ifdef INET
			case AF_INET:
				ifa_flags = 0;
				break;
#endif
#ifdef INET6
			case AF_INET6:
				ifa6 = (struct in6_ifaddr *)ifa;
				ifa_flags = ifa6->ia6_flags;
				break;
#endif
			default:
				ifa_flags = 0;
				break;
			}
			sctp_ifa = sctp_add_addr_to_vrf(vrfid,
			    (void *)ifn,
			    ifn->if_index,
			    ifn->if_type,
			    ifn->if_xname,
			    (void *)ifa,
			    ifa->ifa_addr,
			    ifa_flags,
			    0);
			if (sctp_ifa) {
				sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
			}
		}
	}
	NET_EPOCH_EXIT(et);
	IFNET_RUNLOCK();
}

void
sctp_init_vrf_list(int vrfid)
{
	if (vrfid > SCTP_MAX_VRF_ID)
		/* can't do that */
		return;

/* Don't care about return here */
	(void)sctp_allocate_vrf(vrfid);

/*
	 * Now we need to build all the ifn's for this vrf and there
	 * addresses
	 */
	sctp_init_ifns_for_vrf(vrfid);
}

void
sctp_addr_change(struct ifaddr *ifa, int cmd)
{
	uint32_t ifa_flags = 0;

if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
		return;
	}
	/*
	 * BSD only has one VRF, if this changes we will need to hook in the
	 * right things here to get the id to pass to the address management
	 * routine.
	 */
	if (SCTP_BASE_VAR(first_time) == 0) {
		/* Special test to see if my ::1 will showup with this */
		SCTP_BASE_VAR(first_time) = 1;
		sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
	}

if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
		/* don't know what to do with this */
		return;
	}

if (ifa->ifa_addr == NULL) {
		return;
	}
	if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
		/* non desired type */
		return;
	}
	switch (ifa->ifa_addr->sa_family) {
#ifdef INET
	case AF_INET:
		if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
			return;
		}
		break;
#endif
#ifdef INET6
	case AF_INET6:
		ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
		if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
			/* skip unspecifed addresses */
			return;
		}
		break;
#endif
	default:
		/* non inet/inet6 skip */
		return;
	}
	if (cmd == RTM_ADD) {
		(void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
		    ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
		    (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
	} else {
		sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
		    ifa->ifa_ifp->if_index,
		    ifa->ifa_ifp->if_xname);

/*
		 * We don't bump refcount here so when it completes the
		 * final delete will happen.
		 */
	}
}

void
sctp_addr_change_event_handler(void *arg __unused, struct ifaddr *ifa, int cmd)
{
	sctp_addr_change(ifa, cmd);
}

struct mbuf *
sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
    int how, int allonebuf, int type)
{
	struct mbuf *m = NULL;

m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
	if (m == NULL) {
		/* bad, no memory */
		return (m);
	}
	if (allonebuf) {
		if (SCTP_BUF_SIZE(m) < space_needed) {
			m_freem(m);
			return (NULL);
		}
		KASSERT(SCTP_BUF_NEXT(m) == NULL, ("%s: no chain allowed", __func__));
	}
#ifdef SCTP_MBUF_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
		sctp_log_mb(m, SCTP_MBUF_IALLOC);
	}
#endif
	return (m);
}

#ifdef SCTP_PACKET_LOGGING
void
sctp_packet_log(struct mbuf *m)
{
	int *lenat, thisone;
	void *copyto;
	uint32_t *tick_tock;
	int length;
	int total_len;
	int grabbed_lock = 0;
	int value, newval, thisend, thisbegin;

/*
	 * Buffer layout. -sizeof this entry (total_len) -previous end
	 * (value) -ticks of log      (ticks) o -ip packet o -as logged -
	 * where this started (thisbegin) x <--end points here
	 */
	length = SCTP_HEADER_LEN(m);
	total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
	/* Log a packet to the buffer. */
	if (total_len > SCTP_PACKET_LOG_SIZE) {
		/* Can't log this packet I have not a buffer big enough */
		return;
	}
	if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
		return;
	}
	atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
try_again:
	if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
		SCTP_IP_PKTLOG_LOCK();
		grabbed_lock = 1;
again_locked:
		value = SCTP_BASE_VAR(packet_log_end);
		newval = SCTP_BASE_VAR(packet_log_end) + total_len;
		if (newval >= SCTP_PACKET_LOG_SIZE) {
			/* we wrapped */
			thisbegin = 0;
			thisend = total_len;
		} else {
			thisbegin = SCTP_BASE_VAR(packet_log_end);
			thisend = newval;
		}
		if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
			goto again_locked;
		}
	} else {
		value = SCTP_BASE_VAR(packet_log_end);
		newval = SCTP_BASE_VAR(packet_log_end) + total_len;
		if (newval >= SCTP_PACKET_LOG_SIZE) {
			/* we wrapped */
			thisbegin = 0;
			thisend = total_len;
		} else {
			thisbegin = SCTP_BASE_VAR(packet_log_end);
			thisend = newval;
		}
		if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
			goto try_again;
		}
	}
	/* Sanity check */
	if (thisend >= SCTP_PACKET_LOG_SIZE) {
		SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
		    thisbegin,
		    thisend,
		    SCTP_BASE_VAR(packet_log_writers),
		    grabbed_lock,
		    SCTP_BASE_VAR(packet_log_end));
		SCTP_BASE_VAR(packet_log_end) = 0;
		goto no_log;
	}
	lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
	*lenat = total_len;
	lenat++;
	*lenat = value;
	lenat++;
	tick_tock = (uint32_t *)lenat;
	lenat++;
	*tick_tock = sctp_get_tick_count();
	copyto = (void *)lenat;
	thisone = thisend - sizeof(int);
	lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
	*lenat = thisbegin;
	if (grabbed_lock) {
		SCTP_IP_PKTLOG_UNLOCK();
		grabbed_lock = 0;
	}
	m_copydata(m, 0, length, (caddr_t)copyto);
no_log:
	if (grabbed_lock) {
		SCTP_IP_PKTLOG_UNLOCK();
	}
	atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
}

int
sctp_copy_out_packet_log(uint8_t *target, int length)
{
	/*
	 * We wind through the packet log starting at start copying up to
	 * length bytes out. We return the number of bytes copied.
	 */
	int tocopy, this_copy;
	int *lenat;
	int did_delay = 0;

tocopy = length;
	if (length < (int)(2 * sizeof(int))) {
		/* not enough room */
		return (0);
	}
	if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
		atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
again:
		if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
			/*
			 * we delay here for just a moment hoping the
			 * writer(s) that were present when we entered will
			 * have left and we only have locking ones that will
			 * contend with us for the lock. This does not
			 * assure 100% access, but its good enough for a
			 * logging facility like this.
			 */
			did_delay = 1;
			DELAY(10);
			goto again;
		}
	}
	SCTP_IP_PKTLOG_LOCK();
	lenat = (int *)target;
	*lenat = SCTP_BASE_VAR(packet_log_end);
	lenat++;
	this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
	memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
	if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
		atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
		    SCTP_PKTLOG_WRITERS_NEED_LOCK);
	}
	SCTP_IP_PKTLOG_UNLOCK();
	return (this_copy + sizeof(int));
}

#endif

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