sctp_sysctl.c

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 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.h>
#include <netinet/sctp_constants.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
 
FEATURE(sctp, "Stream Control Transmission Protocol");
 
/*
 * sysctl tunable variables
 */
 
void
sctp_init_sysctls()
{
        SCTP_BASE_SYSCTL(sctp_sendspace) = SCTPCTL_MAXDGRAM_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_recvspace) = SCTPCTL_RECVSPACE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_auto_asconf) = SCTPCTL_AUTOASCONF_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_multiple_asconfs) = SCTPCTL_MULTIPLEASCONFS_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_ecn_enable) = SCTPCTL_ECN_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_pr_enable) = SCTPCTL_PR_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_auth_enable) = SCTPCTL_AUTH_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_asconf_enable) = SCTPCTL_ASCONF_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_reconfig_enable) = SCTPCTL_RECONFIG_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_nrsack_enable) = SCTPCTL_NRSACK_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_pktdrop_enable) = SCTPCTL_PKTDROP_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_peer_chunk_oh) = SCTPCTL_PEER_CHKOH_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_max_burst_default) = SCTPCTL_MAXBURST_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_fr_max_burst_default) = SCTPCTL_FRMAXBURST_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue) = SCTPCTL_MAXCHUNKS_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_hashtblsize) = SCTPCTL_TCBHASHSIZE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_pcbtblsize) = SCTPCTL_PCBHASHSIZE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_min_split_point) = SCTPCTL_MIN_SPLIT_POINT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_chunkscale) = SCTPCTL_CHUNKSCALE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_delayed_sack_time_default) = SCTPCTL_DELAYED_SACK_TIME_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_sack_freq_default) = SCTPCTL_SACK_FREQ_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_system_free_resc_limit) = SCTPCTL_SYS_RESOURCE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_asoc_free_resc_limit) = SCTPCTL_ASOC_RESOURCE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_heartbeat_interval_default) = SCTPCTL_HEARTBEAT_INTERVAL_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_pmtu_raise_time_default) = SCTPCTL_PMTU_RAISE_TIME_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_shutdown_guard_time_default) = SCTPCTL_SHUTDOWN_GUARD_TIME_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_secret_lifetime_default) = SCTPCTL_SECRET_LIFETIME_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_rto_max_default) = SCTPCTL_RTO_MAX_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_rto_min_default) = SCTPCTL_RTO_MIN_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_rto_initial_default) = SCTPCTL_RTO_INITIAL_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_init_rto_max_default) = SCTPCTL_INIT_RTO_MAX_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_valid_cookie_life_default) = SCTPCTL_VALID_COOKIE_LIFE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_init_rtx_max_default) = SCTPCTL_INIT_RTX_MAX_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_assoc_rtx_max_default) = SCTPCTL_ASSOC_RTX_MAX_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_path_rtx_max_default) = SCTPCTL_PATH_RTX_MAX_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_path_pf_threshold) = SCTPCTL_PATH_PF_THRESHOLD_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_add_more_threshold) = SCTPCTL_ADD_MORE_ON_OUTPUT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_nr_incoming_streams_default) = SCTPCTL_INCOMING_STREAMS_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_nr_outgoing_streams_default) = SCTPCTL_OUTGOING_STREAMS_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_cmt_on_off) = SCTPCTL_CMT_ON_OFF_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_cmt_use_dac) = SCTPCTL_CMT_USE_DAC_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) = SCTPCTL_CWND_MAXBURST_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_nat_friendly) = SCTPCTL_NAT_FRIENDLY_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_L2_abc_variable) = SCTPCTL_ABC_L_VAR_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) = SCTPCTL_MAX_CHAINED_MBUFS_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_do_drain) = SCTPCTL_DO_SCTP_DRAIN_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_hb_maxburst) = SCTPCTL_HB_MAX_BURST_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit) = SCTPCTL_ABORT_AT_LIMIT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_min_residual) = SCTPCTL_MIN_RESIDUAL_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_max_retran_chunk) = SCTPCTL_MAX_RETRAN_CHUNK_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_logging_level) = SCTPCTL_LOGGING_LEVEL_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_default_cc_module) = SCTPCTL_DEFAULT_CC_MODULE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_default_ss_module) = SCTPCTL_DEFAULT_SS_MODULE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_default_frag_interleave) = SCTPCTL_DEFAULT_FRAG_INTERLEAVE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_mobility_base) = SCTPCTL_MOBILITY_BASE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_mobility_fasthandoff) = SCTPCTL_MOBILITY_FASTHANDOFF_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_vtag_time_wait) = SCTPCTL_TIME_WAIT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_buffer_splitting) = SCTPCTL_BUFFER_SPLITTING_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_initial_cwnd) = SCTPCTL_INITIAL_CWND_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_rttvar_bw) = SCTPCTL_RTTVAR_BW_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_rttvar_rtt) = SCTPCTL_RTTVAR_RTT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_rttvar_eqret) = SCTPCTL_RTTVAR_EQRET_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_steady_step) = SCTPCTL_RTTVAR_STEADYS_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_use_dccc_ecn) = SCTPCTL_RTTVAR_DCCCECN_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_blackhole) = SCTPCTL_BLACKHOLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_sendall_limit) = SCTPCTL_SENDALL_LIMIT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_diag_info_code) = SCTPCTL_DIAG_INFO_CODE_DEFAULT;
#if defined(SCTP_LOCAL_TRACE_BUF)
        memset(&SCTP_BASE_SYSCTL(sctp_log), 0, sizeof(struct sctp_log));
#endif
        SCTP_BASE_SYSCTL(sctp_udp_tunneling_port) = SCTPCTL_UDP_TUNNELING_PORT_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) = SCTPCTL_SACK_IMMEDIATELY_ENABLE_DEFAULT;
        SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly) = SCTPCTL_NAT_FRIENDLY_INITS_DEFAULT;
#if defined(SCTP_DEBUG)
        SCTP_BASE_SYSCTL(sctp_debug_on) = SCTPCTL_DEBUG_DEFAULT;
#endif
}
 
/* It returns an upper limit. No filtering is done here */
static unsigned int
sctp_sysctl_number_of_addresses(struct sctp_inpcb *inp)
{
        unsigned int cnt;
        struct sctp_vrf *vrf;
        struct sctp_ifn *sctp_ifn;
        struct sctp_ifa *sctp_ifa;
        struct sctp_laddr *laddr;
 
        cnt = 0;
        /* neither Mac OS X nor FreeBSD support mulitple routing functions */
        if ((vrf = sctp_find_vrf(inp->def_vrf_id)) == NULL) {
                return (0);
        }
        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
                        LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                                switch (sctp_ifa->address.sa.sa_family) {
#ifdef INET
                                case AF_INET:
#endif
#ifdef INET6
                                case AF_INET6:
#endif
                                        cnt++;
                                        break;
                                default:
                                        break;
                                }
                        }
                }
        } else {
                LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                        switch (laddr->ifa->address.sa.sa_family) {
#ifdef INET
                        case AF_INET:
#endif
#ifdef INET6
                        case AF_INET6:
#endif
                                cnt++;
                                break;
                        default:
                                break;
                        }
                }
        }
        return (cnt);
}
 
static int
sctp_sysctl_copy_out_local_addresses(struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sysctl_req *req)
{
        struct sctp_ifn *sctp_ifn;
        struct sctp_ifa *sctp_ifa;
        int loopback_scope, ipv4_local_scope, local_scope, site_scope;
        int ipv4_addr_legal, ipv6_addr_legal;
        struct sctp_vrf *vrf;
        struct xsctp_laddr xladdr;
        struct sctp_laddr *laddr;
        int error;
 
        /* Turn on all the appropriate scope */
        if (stcb) {
                /* use association specific values */
                loopback_scope = stcb->asoc.scope.loopback_scope;
                ipv4_local_scope = stcb->asoc.scope.ipv4_local_scope;
                local_scope = stcb->asoc.scope.local_scope;
                site_scope = stcb->asoc.scope.site_scope;
                ipv4_addr_legal = stcb->asoc.scope.ipv4_addr_legal;
                ipv6_addr_legal = stcb->asoc.scope.ipv6_addr_legal;
        } else {
                /* Use generic values for endpoints. */
                loopback_scope = 1;
                ipv4_local_scope = 1;
                local_scope = 1;
                site_scope = 1;
                if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                        ipv6_addr_legal = 1;
                        if (SCTP_IPV6_V6ONLY(inp)) {
                                ipv4_addr_legal = 0;
                        } else {
                                ipv4_addr_legal = 1;
                        }
                } else {
                        ipv6_addr_legal = 0;
                        ipv4_addr_legal = 1;
                }
        }
 
        /* neither Mac OS X nor FreeBSD support mulitple routing functions */
        if ((vrf = sctp_find_vrf(inp->def_vrf_id)) == NULL) {
                SCTP_INP_RUNLOCK(inp);
                SCTP_INP_INFO_RUNLOCK();
                return (-1);
        }
        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
                        if ((loopback_scope == 0) && SCTP_IFN_IS_IFT_LOOP(sctp_ifn))
                                /* Skip loopback if loopback_scope not set */
                                continue;
                        LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                                if (stcb) {
                                        /*
                                         * ignore if blacklisted at
                                         * association level
                                         */
                                        if (sctp_is_addr_restricted(stcb, sctp_ifa))
                                                continue;
                                }
                                switch (sctp_ifa->address.sa.sa_family) {
#ifdef INET
                                case AF_INET:
                                        if (ipv4_addr_legal) {
                                                struct sockaddr_in *sin;
 
                                                sin = &sctp_ifa->address.sin;
                                                if (sin->sin_addr.s_addr == 0)
                                                        continue;
                                                if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
                                                    &sin->sin_addr) != 0) {
                                                        continue;
                                                }
                                                if ((ipv4_local_scope == 0) && (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)))
                                                        continue;
                                        } else {
                                                continue;
                                        }
                                        break;
#endif
#ifdef INET6
                                case AF_INET6:
                                        if (ipv6_addr_legal) {
                                                struct sockaddr_in6 *sin6;
 
                                                sin6 = &sctp_ifa->address.sin6;
                                                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                                                        continue;
                                                if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
                                                    &sin6->sin6_addr) != 0) {
                                                        continue;
                                                }
                                                if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                                        if (local_scope == 0)
                                                                continue;
                                                }
                                                if ((site_scope == 0) && (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)))
                                                        continue;
                                        } else {
                                                continue;
                                        }
                                        break;
#endif
                                default:
                                        continue;
                                }
                                memset((void *)&xladdr, 0, sizeof(struct xsctp_laddr));
                                memcpy((void *)&xladdr.address, (const void *)&sctp_ifa->address, sizeof(union sctp_sockstore));
                                SCTP_INP_RUNLOCK(inp);
                                SCTP_INP_INFO_RUNLOCK();
                                error = SYSCTL_OUT(req, &xladdr, sizeof(struct xsctp_laddr));
                                if (error) {
                                        return (error);
                                } else {
                                        SCTP_INP_INFO_RLOCK();
                                        SCTP_INP_RLOCK(inp);
                                }
                        }
                }
        } else {
                LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                        /* ignore if blacklisted at association level */
                        if (stcb && sctp_is_addr_restricted(stcb, laddr->ifa))
                                continue;
                        memset((void *)&xladdr, 0, sizeof(struct xsctp_laddr));
                        memcpy((void *)&xladdr.address, (const void *)&laddr->ifa->address, sizeof(union sctp_sockstore));
                        xladdr.start_time.tv_sec = (uint32_t)laddr->start_time.tv_sec;
                        xladdr.start_time.tv_usec = (uint32_t)laddr->start_time.tv_usec;
                        SCTP_INP_RUNLOCK(inp);
                        SCTP_INP_INFO_RUNLOCK();
                        error = SYSCTL_OUT(req, &xladdr, sizeof(struct xsctp_laddr));
                        if (error) {
                                return (error);
                        } else {
                                SCTP_INP_INFO_RLOCK();
                                SCTP_INP_RLOCK(inp);
                        }
                }
        }
        memset((void *)&xladdr, 0, sizeof(struct xsctp_laddr));
        xladdr.last = 1;
        SCTP_INP_RUNLOCK(inp);
        SCTP_INP_INFO_RUNLOCK();
        error = SYSCTL_OUT(req, &xladdr, sizeof(struct xsctp_laddr));
 
        if (error) {
                return (error);
        } else {
                SCTP_INP_INFO_RLOCK();
                SCTP_INP_RLOCK(inp);
                return (0);
        }
}
 
/*
 * sysctl functions
 */
static int
sctp_sysctl_handle_assoclist(SYSCTL_HANDLER_ARGS)
{
        unsigned int number_of_endpoints;
        unsigned int number_of_local_addresses;
        unsigned int number_of_associations;
        unsigned int number_of_remote_addresses;
        unsigned int n;
        int error;
        struct sctp_inpcb *inp;
        struct sctp_tcb *stcb;
        struct sctp_nets *net;
        struct xsctp_inpcb xinpcb;
        struct xsctp_tcb xstcb;
        struct xsctp_raddr xraddr;
        struct socket *so;
 
        number_of_endpoints = 0;
        number_of_local_addresses = 0;
        number_of_associations = 0;
        number_of_remote_addresses = 0;
 
        SCTP_INP_INFO_RLOCK();
        if (req->oldptr == NULL) {
                LIST_FOREACH(inp, &SCTP_BASE_INFO(listhead), sctp_list) {
                        SCTP_INP_RLOCK(inp);
                        number_of_endpoints++;
                        number_of_local_addresses += sctp_sysctl_number_of_addresses(inp);
                        LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                                number_of_associations++;
                                number_of_local_addresses += sctp_sysctl_number_of_addresses(inp);
                                TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                                        number_of_remote_addresses++;
                                }
                        }
                        SCTP_INP_RUNLOCK(inp);
                }
                SCTP_INP_INFO_RUNLOCK();
                n = (number_of_endpoints + 1) * sizeof(struct xsctp_inpcb) +
                    (number_of_local_addresses + number_of_endpoints + number_of_associations) * sizeof(struct xsctp_laddr) +
                    (number_of_associations + number_of_endpoints) * sizeof(struct xsctp_tcb) +
                    (number_of_remote_addresses + number_of_associations) * sizeof(struct xsctp_raddr);
 
                /* request some more memory than needed */
                req->oldidx = (n + n / 8);
                return (0);
        }
        if (req->newptr != NULL) {
                SCTP_INP_INFO_RUNLOCK();
                SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_SYSCTL, EPERM);
                return (EPERM);
        }
        memset(&xinpcb, 0, sizeof(xinpcb));
        memset(&xstcb, 0, sizeof(xstcb));
        memset(&xraddr, 0, sizeof(xraddr));
        LIST_FOREACH(inp, &SCTP_BASE_INFO(listhead), sctp_list) {
                SCTP_INP_RLOCK(inp);
                if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                        /* if its allgone it is being freed - skip it  */
                        goto skip;
                }
                xinpcb.last = 0;
                xinpcb.local_port = ntohs(inp->sctp_lport);
                xinpcb.flags = inp->sctp_flags;
                xinpcb.features = inp->sctp_features;
                xinpcb.total_sends = inp->total_sends;
                xinpcb.total_recvs = inp->total_recvs;
                xinpcb.total_nospaces = inp->total_nospaces;
                xinpcb.fragmentation_point = inp->sctp_frag_point;
                xinpcb.socket = (uintptr_t)inp->sctp_socket;
                so = inp->sctp_socket;
                if ((so == NULL) ||
                    (!SCTP_IS_LISTENING(inp)) ||
                    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE)) {
                        xinpcb.qlen = 0;
                        xinpcb.maxqlen = 0;
                } else {
                        xinpcb.qlen = so->sol_qlen;
                        xinpcb.qlen_old = so->sol_qlen > USHRT_MAX ?
                            USHRT_MAX : (uint16_t)so->sol_qlen;
                        xinpcb.maxqlen = so->sol_qlimit;
                        xinpcb.maxqlen_old = so->sol_qlimit > USHRT_MAX ?
                            USHRT_MAX : (uint16_t)so->sol_qlimit;
                }
                SCTP_INP_INCR_REF(inp);
                SCTP_INP_RUNLOCK(inp);
                SCTP_INP_INFO_RUNLOCK();
                error = SYSCTL_OUT(req, &xinpcb, sizeof(struct xsctp_inpcb));
                if (error) {
                        SCTP_INP_DECR_REF(inp);
                        return (error);
                }
                SCTP_INP_INFO_RLOCK();
                SCTP_INP_RLOCK(inp);
                error = sctp_sysctl_copy_out_local_addresses(inp, NULL, req);
                if (error) {
                        SCTP_INP_DECR_REF(inp);
                        return (error);
                }
                LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                        SCTP_TCB_LOCK(stcb);
                        atomic_add_int(&stcb->asoc.refcnt, 1);
                        SCTP_TCB_UNLOCK(stcb);
                        xstcb.last = 0;
                        xstcb.local_port = ntohs(inp->sctp_lport);
                        xstcb.remote_port = ntohs(stcb->rport);
                        if (stcb->asoc.primary_destination != NULL)
                                xstcb.primary_addr = stcb->asoc.primary_destination->ro._l_addr;
                        xstcb.heartbeat_interval = stcb->asoc.heart_beat_delay;
                        xstcb.state = (uint32_t)sctp_map_assoc_state(stcb->asoc.state);
                        xstcb.assoc_id = sctp_get_associd(stcb);
                        xstcb.peers_rwnd = stcb->asoc.peers_rwnd;
                        xstcb.in_streams = stcb->asoc.streamincnt;
                        xstcb.out_streams = stcb->asoc.streamoutcnt;
                        xstcb.max_nr_retrans = stcb->asoc.overall_error_count;
                        xstcb.primary_process = 0;      /* not really supported
                                                         * yet */
                        xstcb.T1_expireries = stcb->asoc.timoinit + stcb->asoc.timocookie;
                        xstcb.T2_expireries = stcb->asoc.timoshutdown + stcb->asoc.timoshutdownack;
                        xstcb.retransmitted_tsns = stcb->asoc.marked_retrans;
                        xstcb.start_time.tv_sec = (uint32_t)stcb->asoc.start_time.tv_sec;
                        xstcb.start_time.tv_usec = (uint32_t)stcb->asoc.start_time.tv_usec;
                        xstcb.discontinuity_time.tv_sec = (uint32_t)stcb->asoc.discontinuity_time.tv_sec;
                        xstcb.discontinuity_time.tv_usec = (uint32_t)stcb->asoc.discontinuity_time.tv_usec;
                        xstcb.total_sends = stcb->total_sends;
                        xstcb.total_recvs = stcb->total_recvs;
                        xstcb.local_tag = stcb->asoc.my_vtag;
                        xstcb.remote_tag = stcb->asoc.peer_vtag;
                        xstcb.initial_tsn = stcb->asoc.init_seq_number;
                        xstcb.highest_tsn = stcb->asoc.sending_seq - 1;
                        xstcb.cumulative_tsn = stcb->asoc.last_acked_seq;
                        xstcb.cumulative_tsn_ack = stcb->asoc.cumulative_tsn;
                        xstcb.mtu = stcb->asoc.smallest_mtu;
                        xstcb.refcnt = stcb->asoc.refcnt;
                        SCTP_INP_RUNLOCK(inp);
                        SCTP_INP_INFO_RUNLOCK();
                        error = SYSCTL_OUT(req, &xstcb, sizeof(struct xsctp_tcb));
                        if (error) {
                                SCTP_INP_DECR_REF(inp);
                                atomic_subtract_int(&stcb->asoc.refcnt, 1);
                                return (error);
                        }
                        SCTP_INP_INFO_RLOCK();
                        SCTP_INP_RLOCK(inp);
                        error = sctp_sysctl_copy_out_local_addresses(inp, stcb, req);
                        if (error) {
                                SCTP_INP_DECR_REF(inp);
                                atomic_subtract_int(&stcb->asoc.refcnt, 1);
                                return (error);
                        }
                        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                                xraddr.last = 0;
                                xraddr.address = net->ro._l_addr;
                                xraddr.active = ((net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE);
                                xraddr.confirmed = ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0);
                                xraddr.heartbeat_enabled = ((net->dest_state & SCTP_ADDR_NOHB) == 0);
                                xraddr.potentially_failed = ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF);
                                xraddr.rto = net->RTO;
                                xraddr.max_path_rtx = net->failure_threshold;
                                xraddr.rtx = net->marked_retrans;
                                xraddr.error_counter = net->error_count;
                                xraddr.cwnd = net->cwnd;
                                xraddr.flight_size = net->flight_size;
                                xraddr.mtu = net->mtu;
                                xraddr.rtt = net->rtt / 1000;
                                xraddr.heartbeat_interval = net->heart_beat_delay;
                                xraddr.ssthresh = net->ssthresh;
                                xraddr.encaps_port = net->port;
                                if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
                                        xraddr.state = SCTP_UNCONFIRMED;
                                } else if (net->dest_state & SCTP_ADDR_REACHABLE) {
                                        xraddr.state = SCTP_ACTIVE;
                                } else {
                                        xraddr.state = SCTP_INACTIVE;
                                }
                                xraddr.start_time.tv_sec = (uint32_t)net->start_time.tv_sec;
                                xraddr.start_time.tv_usec = (uint32_t)net->start_time.tv_usec;
                                SCTP_INP_RUNLOCK(inp);
                                SCTP_INP_INFO_RUNLOCK();
                                error = SYSCTL_OUT(req, &xraddr, sizeof(struct xsctp_raddr));
                                if (error) {
                                        SCTP_INP_DECR_REF(inp);
                                        atomic_subtract_int(&stcb->asoc.refcnt, 1);
                                        return (error);
                                }
                                SCTP_INP_INFO_RLOCK();
                                SCTP_INP_RLOCK(inp);
                        }
                        atomic_subtract_int(&stcb->asoc.refcnt, 1);
                        memset((void *)&xraddr, 0, sizeof(struct xsctp_raddr));
                        xraddr.last = 1;
                        SCTP_INP_RUNLOCK(inp);
                        SCTP_INP_INFO_RUNLOCK();
                        error = SYSCTL_OUT(req, &xraddr, sizeof(struct xsctp_raddr));
                        if (error) {
                                SCTP_INP_DECR_REF(inp);
                                return (error);
                        }
                        SCTP_INP_INFO_RLOCK();
                        SCTP_INP_RLOCK(inp);
                }
                SCTP_INP_DECR_REF(inp);
                SCTP_INP_RUNLOCK(inp);
                SCTP_INP_INFO_RUNLOCK();
                memset((void *)&xstcb, 0, sizeof(struct xsctp_tcb));
                xstcb.last = 1;
                error = SYSCTL_OUT(req, &xstcb, sizeof(struct xsctp_tcb));
                if (error) {
                        return (error);
                }
skip:
                SCTP_INP_INFO_RLOCK();
        }
        SCTP_INP_INFO_RUNLOCK();
 
        memset((void *)&xinpcb, 0, sizeof(struct xsctp_inpcb));
        xinpcb.last = 1;
        error = SYSCTL_OUT(req, &xinpcb, sizeof(struct xsctp_inpcb));
        return (error);
}
 
static int
sctp_sysctl_handle_udp_tunneling(SYSCTL_HANDLER_ARGS)
{
        int error;
        uint32_t old, new;
 
        SCTP_INP_INFO_RLOCK();
        old = SCTP_BASE_SYSCTL(sctp_udp_tunneling_port);
        SCTP_INP_INFO_RUNLOCK();
        new = old;
        error = sysctl_handle_int(oidp, &new, 0, req);
        if ((error == 0) &&
            (req->newptr != NULL)) {
#if (SCTPCTL_UDP_TUNNELING_PORT_MIN == 0)
                if (new > SCTPCTL_UDP_TUNNELING_PORT_MAX) {
#else
                if ((new < SCTPCTL_UDP_TUNNELING_PORT_MIN) ||
                    (new > SCTPCTL_UDP_TUNNELING_PORT_MAX)) {
#endif
                        error = EINVAL;
                } else {
                        SCTP_INP_INFO_WLOCK();
                        SCTP_BASE_SYSCTL(sctp_udp_tunneling_port) = new;
                        if (old != 0) {
                                sctp_over_udp_stop();
                        }
                        if (new != 0) {
                                error = sctp_over_udp_start();
                        }
                        SCTP_INP_INFO_WUNLOCK();
                }
        }
        return (error);
}
 
static int
sctp_sysctl_handle_auth(SYSCTL_HANDLER_ARGS)
{
        int error;
        uint32_t new;
 
        new = SCTP_BASE_SYSCTL(sctp_auth_enable);
        error = sysctl_handle_int(oidp, &new, 0, req);
        if ((error == 0) &&
            (req->newptr != NULL)) {
#if (SCTPCTL_AUTH_ENABLE_MIN == 0)
                if ((new > SCTPCTL_AUTH_ENABLE_MAX) ||
                    ((new == 0) && (SCTP_BASE_SYSCTL(sctp_asconf_enable) == 1))) {
#else
                if ((new < SCTPCTL_AUTH_ENABLE_MIN) ||
                    (new > SCTPCTL_AUTH_ENABLE_MAX) ||
                    ((new == 0) && (SCTP_BASE_SYSCTL(sctp_asconf_enable) == 1))) {
#endif
                        error = EINVAL;
                } else {
                        SCTP_BASE_SYSCTL(sctp_auth_enable) = new;
                }
        }
        return (error);
}
 
static int
sctp_sysctl_handle_asconf(SYSCTL_HANDLER_ARGS)
{
        int error;
        uint32_t new;
 
        new = SCTP_BASE_SYSCTL(sctp_asconf_enable);
        error = sysctl_handle_int(oidp, &new, 0, req);
        if ((error == 0) &&
            (req->newptr != NULL)) {
#if (SCTPCTL_ASCONF_ENABLE_MIN == 0)
                if ((new > SCTPCTL_ASCONF_ENABLE_MAX) ||
                    ((new == 1) && (SCTP_BASE_SYSCTL(sctp_auth_enable) == 0))) {
#else
                if ((new < SCTPCTL_ASCONF_ENABLE_MIN) ||
                    (new > SCTPCTL_ASCONF_ENABLE_MAX) ||
                    ((new == 1) && (SCTP_BASE_SYSCTL(sctp_auth_enable) == 0))) {
#endif
                        error = EINVAL;
                } else {
                        SCTP_BASE_SYSCTL(sctp_asconf_enable) = new;
                }
        }
        return (error);
}
 
static int
sctp_sysctl_handle_stats(SYSCTL_HANDLER_ARGS)
{
        int error;
#if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
        struct sctpstat *sarry;
        struct sctpstat sb;
        int cpu;
#endif
        struct sctpstat sb_temp;
 
        if ((req->newptr != NULL) &&
            (req->newlen != sizeof(struct sctpstat))) {
                return (EINVAL);
        }
        memset(&sb_temp, 0, sizeof(struct sctpstat));
 
        if (req->newptr != NULL) {
                error = SYSCTL_IN(req, &sb_temp, sizeof(struct sctpstat));
                if (error != 0) {
                        return (error);
                }
        }
#if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
        memset(&sb, 0, sizeof(sb));
        for (cpu = 0; cpu < mp_maxid; cpu++) {
                sarry = &SCTP_BASE_STATS[cpu];
                if (sarry->sctps_discontinuitytime.tv_sec > sb.sctps_discontinuitytime.tv_sec) {
                        sb.sctps_discontinuitytime.tv_sec = sarry->sctps_discontinuitytime.tv_sec;
                        sb.sctps_discontinuitytime.tv_usec = sarry->sctps_discontinuitytime.tv_usec;
                }
                sb.sctps_currestab += sarry->sctps_currestab;
                sb.sctps_activeestab += sarry->sctps_activeestab;
                sb.sctps_restartestab += sarry->sctps_restartestab;
                sb.sctps_collisionestab += sarry->sctps_collisionestab;
                sb.sctps_passiveestab += sarry->sctps_passiveestab;
                sb.sctps_aborted += sarry->sctps_aborted;
                sb.sctps_shutdown += sarry->sctps_shutdown;
                sb.sctps_outoftheblue += sarry->sctps_outoftheblue;
                sb.sctps_checksumerrors += sarry->sctps_checksumerrors;
                sb.sctps_outcontrolchunks += sarry->sctps_outcontrolchunks;
                sb.sctps_outorderchunks += sarry->sctps_outorderchunks;
                sb.sctps_outunorderchunks += sarry->sctps_outunorderchunks;
                sb.sctps_incontrolchunks += sarry->sctps_incontrolchunks;
                sb.sctps_inorderchunks += sarry->sctps_inorderchunks;
                sb.sctps_inunorderchunks += sarry->sctps_inunorderchunks;
                sb.sctps_fragusrmsgs += sarry->sctps_fragusrmsgs;
                sb.sctps_reasmusrmsgs += sarry->sctps_reasmusrmsgs;
                sb.sctps_outpackets += sarry->sctps_outpackets;
                sb.sctps_inpackets += sarry->sctps_inpackets;
                sb.sctps_recvpackets += sarry->sctps_recvpackets;
                sb.sctps_recvdatagrams += sarry->sctps_recvdatagrams;
                sb.sctps_recvpktwithdata += sarry->sctps_recvpktwithdata;
                sb.sctps_recvsacks += sarry->sctps_recvsacks;
                sb.sctps_recvdata += sarry->sctps_recvdata;
                sb.sctps_recvdupdata += sarry->sctps_recvdupdata;
                sb.sctps_recvheartbeat += sarry->sctps_recvheartbeat;
                sb.sctps_recvheartbeatack += sarry->sctps_recvheartbeatack;
                sb.sctps_recvecne += sarry->sctps_recvecne;
                sb.sctps_recvauth += sarry->sctps_recvauth;
                sb.sctps_recvauthmissing += sarry->sctps_recvauthmissing;
                sb.sctps_recvivalhmacid += sarry->sctps_recvivalhmacid;
                sb.sctps_recvivalkeyid += sarry->sctps_recvivalkeyid;
                sb.sctps_recvauthfailed += sarry->sctps_recvauthfailed;
                sb.sctps_recvexpress += sarry->sctps_recvexpress;
                sb.sctps_recvexpressm += sarry->sctps_recvexpressm;
                sb.sctps_recvswcrc += sarry->sctps_recvswcrc;
                sb.sctps_recvhwcrc += sarry->sctps_recvhwcrc;
                sb.sctps_sendpackets += sarry->sctps_sendpackets;
                sb.sctps_sendsacks += sarry->sctps_sendsacks;
                sb.sctps_senddata += sarry->sctps_senddata;
                sb.sctps_sendretransdata += sarry->sctps_sendretransdata;
                sb.sctps_sendfastretrans += sarry->sctps_sendfastretrans;
                sb.sctps_sendmultfastretrans += sarry->sctps_sendmultfastretrans;
                sb.sctps_sendheartbeat += sarry->sctps_sendheartbeat;
                sb.sctps_sendecne += sarry->sctps_sendecne;
                sb.sctps_sendauth += sarry->sctps_sendauth;
                sb.sctps_senderrors += sarry->sctps_senderrors;
                sb.sctps_sendswcrc += sarry->sctps_sendswcrc;
                sb.sctps_sendhwcrc += sarry->sctps_sendhwcrc;
                sb.sctps_pdrpfmbox += sarry->sctps_pdrpfmbox;
                sb.sctps_pdrpfehos += sarry->sctps_pdrpfehos;
                sb.sctps_pdrpmbda += sarry->sctps_pdrpmbda;
                sb.sctps_pdrpmbct += sarry->sctps_pdrpmbct;
                sb.sctps_pdrpbwrpt += sarry->sctps_pdrpbwrpt;
                sb.sctps_pdrpcrupt += sarry->sctps_pdrpcrupt;
                sb.sctps_pdrpnedat += sarry->sctps_pdrpnedat;
                sb.sctps_pdrppdbrk += sarry->sctps_pdrppdbrk;
                sb.sctps_pdrptsnnf += sarry->sctps_pdrptsnnf;
                sb.sctps_pdrpdnfnd += sarry->sctps_pdrpdnfnd;
                sb.sctps_pdrpdiwnp += sarry->sctps_pdrpdiwnp;
                sb.sctps_pdrpdizrw += sarry->sctps_pdrpdizrw;
                sb.sctps_pdrpbadd += sarry->sctps_pdrpbadd;
                sb.sctps_pdrpmark += sarry->sctps_pdrpmark;
                sb.sctps_timoiterator += sarry->sctps_timoiterator;
                sb.sctps_timodata += sarry->sctps_timodata;
                sb.sctps_timowindowprobe += sarry->sctps_timowindowprobe;
                sb.sctps_timoinit += sarry->sctps_timoinit;
                sb.sctps_timosack += sarry->sctps_timosack;
                sb.sctps_timoshutdown += sarry->sctps_timoshutdown;
                sb.sctps_timoheartbeat += sarry->sctps_timoheartbeat;
                sb.sctps_timocookie += sarry->sctps_timocookie;
                sb.sctps_timosecret += sarry->sctps_timosecret;
                sb.sctps_timopathmtu += sarry->sctps_timopathmtu;
                sb.sctps_timoshutdownack += sarry->sctps_timoshutdownack;
                sb.sctps_timoshutdownguard += sarry->sctps_timoshutdownguard;
                sb.sctps_timostrmrst += sarry->sctps_timostrmrst;
                sb.sctps_timoearlyfr += sarry->sctps_timoearlyfr;
                sb.sctps_timoasconf += sarry->sctps_timoasconf;
                sb.sctps_timodelprim += sarry->sctps_timodelprim;
                sb.sctps_timoautoclose += sarry->sctps_timoautoclose;
                sb.sctps_timoassockill += sarry->sctps_timoassockill;
                sb.sctps_timoinpkill += sarry->sctps_timoinpkill;
                sb.sctps_hdrops += sarry->sctps_hdrops;
                sb.sctps_badsum += sarry->sctps_badsum;
                sb.sctps_noport += sarry->sctps_noport;
                sb.sctps_badvtag += sarry->sctps_badvtag;
                sb.sctps_badsid += sarry->sctps_badsid;
                sb.sctps_nomem += sarry->sctps_nomem;
                sb.sctps_fastretransinrtt += sarry->sctps_fastretransinrtt;
                sb.sctps_markedretrans += sarry->sctps_markedretrans;
                sb.sctps_naglesent += sarry->sctps_naglesent;
                sb.sctps_naglequeued += sarry->sctps_naglequeued;
                sb.sctps_maxburstqueued += sarry->sctps_maxburstqueued;
                sb.sctps_ifnomemqueued += sarry->sctps_ifnomemqueued;
                sb.sctps_windowprobed += sarry->sctps_windowprobed;
                sb.sctps_lowlevelerr += sarry->sctps_lowlevelerr;
                sb.sctps_lowlevelerrusr += sarry->sctps_lowlevelerrusr;
                sb.sctps_datadropchklmt += sarry->sctps_datadropchklmt;
                sb.sctps_datadroprwnd += sarry->sctps_datadroprwnd;
                sb.sctps_ecnereducedcwnd += sarry->sctps_ecnereducedcwnd;
                sb.sctps_vtagexpress += sarry->sctps_vtagexpress;
                sb.sctps_vtagbogus += sarry->sctps_vtagbogus;
                sb.sctps_primary_randry += sarry->sctps_primary_randry;
                sb.sctps_cmt_randry += sarry->sctps_cmt_randry;
                sb.sctps_slowpath_sack += sarry->sctps_slowpath_sack;
                sb.sctps_wu_sacks_sent += sarry->sctps_wu_sacks_sent;
                sb.sctps_sends_with_flags += sarry->sctps_sends_with_flags;
                sb.sctps_sends_with_unord += sarry->sctps_sends_with_unord;
                sb.sctps_sends_with_eof += sarry->sctps_sends_with_eof;
                sb.sctps_sends_with_abort += sarry->sctps_sends_with_abort;
                sb.sctps_protocol_drain_calls += sarry->sctps_protocol_drain_calls;
                sb.sctps_protocol_drains_done += sarry->sctps_protocol_drains_done;
                sb.sctps_read_peeks += sarry->sctps_read_peeks;
                sb.sctps_cached_chk += sarry->sctps_cached_chk;
                sb.sctps_cached_strmoq += sarry->sctps_cached_strmoq;
                sb.sctps_left_abandon += sarry->sctps_left_abandon;
                sb.sctps_send_burst_avoid += sarry->sctps_send_burst_avoid;
                sb.sctps_send_cwnd_avoid += sarry->sctps_send_cwnd_avoid;
                sb.sctps_fwdtsn_map_over += sarry->sctps_fwdtsn_map_over;
                if (req->newptr != NULL) {
                        memcpy(sarry, &sb_temp, sizeof(struct sctpstat));
                }
        }
        error = SYSCTL_OUT(req, &sb, sizeof(struct sctpstat));
#else
        error = SYSCTL_OUT(req, &SCTP_BASE_STATS, sizeof(struct sctpstat));
        if (error != 0) {
                return (error);
        }
        if (req->newptr != NULL) {
                memcpy(&SCTP_BASE_STATS, &sb_temp, sizeof(struct sctpstat));
        }
#endif
        return (error);
}
 
#if defined(SCTP_LOCAL_TRACE_BUF)
static int
sctp_sysctl_handle_trace_log(SYSCTL_HANDLER_ARGS)
{
        int error;
 
        error = SYSCTL_OUT(req, &SCTP_BASE_SYSCTL(sctp_log), sizeof(struct sctp_log));
        return (error);
}
 
static int
sctp_sysctl_handle_trace_log_clear(SYSCTL_HANDLER_ARGS)
{
        int error = 0;
 
        memset(&SCTP_BASE_SYSCTL(sctp_log), 0, sizeof(struct sctp_log));
        return (error);
}
#endif
 
#define SCTP_UINT_SYSCTL(mib_name, var_name, prefix)                    \
        static int                                                      \
        sctp_sysctl_handle_##mib_name(SYSCTL_HANDLER_ARGS)              \
        {                                                               \
                int error;                                              \
                uint32_t new;                                           \
                                                                        \
                new = SCTP_BASE_SYSCTL(var_name);                       \
                error = sysctl_handle_int(oidp, &new, 0, req);          \
                if ((error == 0) && (req->newptr != NULL)) {            \
                        if ((new < prefix##_MIN) ||                     \
                            (new > prefix##_MAX)) {                     \
                                error = EINVAL;                         \
                        } else {                                        \
                                SCTP_BASE_SYSCTL(var_name) = new;       \
                        }                                               \
                }                                                       \
                return (error);                                         \
        }                                                               \
        SYSCTL_PROC(_net_inet_sctp, OID_AUTO, mib_name,                 \
            CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, \
            NULL, 0, sctp_sysctl_handle_##mib_name, "UI", prefix##_DESC);
 
/*
 * sysctl definitions
 */
 
SCTP_UINT_SYSCTL(sendspace, sctp_sendspace, SCTPCTL_MAXDGRAM)
SCTP_UINT_SYSCTL(recvspace, sctp_recvspace, SCTPCTL_RECVSPACE)
SCTP_UINT_SYSCTL(auto_asconf, sctp_auto_asconf, SCTPCTL_AUTOASCONF)
SCTP_UINT_SYSCTL(ecn_enable, sctp_ecn_enable, SCTPCTL_ECN_ENABLE)
SCTP_UINT_SYSCTL(pr_enable, sctp_pr_enable, SCTPCTL_PR_ENABLE)
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, auth_enable,
    CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_auth, "IU",
    SCTPCTL_AUTH_ENABLE_DESC);
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, asconf_enable,
    CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_asconf, "IU",
    SCTPCTL_ASCONF_ENABLE_DESC);
SCTP_UINT_SYSCTL(reconfig_enable, sctp_reconfig_enable, SCTPCTL_RECONFIG_ENABLE)
SCTP_UINT_SYSCTL(nrsack_enable, sctp_nrsack_enable, SCTPCTL_NRSACK_ENABLE)
SCTP_UINT_SYSCTL(pktdrop_enable, sctp_pktdrop_enable, SCTPCTL_PKTDROP_ENABLE)
SCTP_UINT_SYSCTL(peer_chkoh, sctp_peer_chunk_oh, SCTPCTL_PEER_CHKOH)
SCTP_UINT_SYSCTL(maxburst, sctp_max_burst_default, SCTPCTL_MAXBURST)
SCTP_UINT_SYSCTL(fr_maxburst, sctp_fr_max_burst_default, SCTPCTL_FRMAXBURST)
SCTP_UINT_SYSCTL(maxchunks, sctp_max_chunks_on_queue, SCTPCTL_MAXCHUNKS)
SCTP_UINT_SYSCTL(tcbhashsize, sctp_hashtblsize, SCTPCTL_TCBHASHSIZE)
SCTP_UINT_SYSCTL(pcbhashsize, sctp_pcbtblsize, SCTPCTL_PCBHASHSIZE)
SCTP_UINT_SYSCTL(min_split_point, sctp_min_split_point, SCTPCTL_MIN_SPLIT_POINT)
SCTP_UINT_SYSCTL(chunkscale, sctp_chunkscale, SCTPCTL_CHUNKSCALE)
SCTP_UINT_SYSCTL(delayed_sack_time, sctp_delayed_sack_time_default, SCTPCTL_DELAYED_SACK_TIME)
SCTP_UINT_SYSCTL(sack_freq, sctp_sack_freq_default, SCTPCTL_SACK_FREQ)
SCTP_UINT_SYSCTL(sys_resource, sctp_system_free_resc_limit, SCTPCTL_SYS_RESOURCE)
SCTP_UINT_SYSCTL(asoc_resource, sctp_asoc_free_resc_limit, SCTPCTL_ASOC_RESOURCE)
SCTP_UINT_SYSCTL(heartbeat_interval, sctp_heartbeat_interval_default, SCTPCTL_HEARTBEAT_INTERVAL)
SCTP_UINT_SYSCTL(pmtu_raise_time, sctp_pmtu_raise_time_default, SCTPCTL_PMTU_RAISE_TIME)
SCTP_UINT_SYSCTL(shutdown_guard_time, sctp_shutdown_guard_time_default, SCTPCTL_SHUTDOWN_GUARD_TIME)
SCTP_UINT_SYSCTL(secret_lifetime, sctp_secret_lifetime_default, SCTPCTL_SECRET_LIFETIME)
SCTP_UINT_SYSCTL(rto_max, sctp_rto_max_default, SCTPCTL_RTO_MAX)
SCTP_UINT_SYSCTL(rto_min, sctp_rto_min_default, SCTPCTL_RTO_MIN)
SCTP_UINT_SYSCTL(rto_initial, sctp_rto_initial_default, SCTPCTL_RTO_INITIAL)
SCTP_UINT_SYSCTL(init_rto_max, sctp_init_rto_max_default, SCTPCTL_INIT_RTO_MAX)
SCTP_UINT_SYSCTL(valid_cookie_life, sctp_valid_cookie_life_default, SCTPCTL_VALID_COOKIE_LIFE)
SCTP_UINT_SYSCTL(init_rtx_max, sctp_init_rtx_max_default, SCTPCTL_INIT_RTX_MAX)
SCTP_UINT_SYSCTL(assoc_rtx_max, sctp_assoc_rtx_max_default, SCTPCTL_ASSOC_RTX_MAX)
SCTP_UINT_SYSCTL(path_rtx_max, sctp_path_rtx_max_default, SCTPCTL_PATH_RTX_MAX)
SCTP_UINT_SYSCTL(path_pf_threshold, sctp_path_pf_threshold, SCTPCTL_PATH_PF_THRESHOLD)
SCTP_UINT_SYSCTL(add_more_on_output, sctp_add_more_threshold, SCTPCTL_ADD_MORE_ON_OUTPUT)
SCTP_UINT_SYSCTL(incoming_streams, sctp_nr_incoming_streams_default, SCTPCTL_INCOMING_STREAMS)
SCTP_UINT_SYSCTL(outgoing_streams, sctp_nr_outgoing_streams_default, SCTPCTL_OUTGOING_STREAMS)
SCTP_UINT_SYSCTL(cmt_on_off, sctp_cmt_on_off, SCTPCTL_CMT_ON_OFF)
SCTP_UINT_SYSCTL(cmt_use_dac, sctp_cmt_use_dac, SCTPCTL_CMT_USE_DAC)
SCTP_UINT_SYSCTL(cwnd_maxburst, sctp_use_cwnd_based_maxburst, SCTPCTL_CWND_MAXBURST)
SCTP_UINT_SYSCTL(nat_friendly, sctp_nat_friendly, SCTPCTL_NAT_FRIENDLY)
SCTP_UINT_SYSCTL(abc_l_var, sctp_L2_abc_variable, SCTPCTL_ABC_L_VAR)
SCTP_UINT_SYSCTL(max_chained_mbufs, sctp_mbuf_threshold_count, SCTPCTL_MAX_CHAINED_MBUFS)
SCTP_UINT_SYSCTL(do_sctp_drain, sctp_do_drain, SCTPCTL_DO_SCTP_DRAIN)
SCTP_UINT_SYSCTL(hb_max_burst, sctp_hb_maxburst, SCTPCTL_HB_MAX_BURST)
SCTP_UINT_SYSCTL(abort_at_limit, sctp_abort_if_one_2_one_hits_limit, SCTPCTL_ABORT_AT_LIMIT)
SCTP_UINT_SYSCTL(min_residual, sctp_min_residual, SCTPCTL_MIN_RESIDUAL)
SCTP_UINT_SYSCTL(max_retran_chunk, sctp_max_retran_chunk, SCTPCTL_MAX_RETRAN_CHUNK)
SCTP_UINT_SYSCTL(log_level, sctp_logging_level, SCTPCTL_LOGGING_LEVEL)
SCTP_UINT_SYSCTL(default_cc_module, sctp_default_cc_module, SCTPCTL_DEFAULT_CC_MODULE)
SCTP_UINT_SYSCTL(default_ss_module, sctp_default_ss_module, SCTPCTL_DEFAULT_SS_MODULE)
SCTP_UINT_SYSCTL(default_frag_interleave, sctp_default_frag_interleave, SCTPCTL_DEFAULT_FRAG_INTERLEAVE)
SCTP_UINT_SYSCTL(mobility_base, sctp_mobility_base, SCTPCTL_MOBILITY_BASE)
SCTP_UINT_SYSCTL(mobility_fasthandoff, sctp_mobility_fasthandoff, SCTPCTL_MOBILITY_FASTHANDOFF)
#if defined(SCTP_LOCAL_TRACE_BUF)
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, log,
    CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_trace_log, "S,sctplog"a
    , "SCTP logging (struct sctp_log)");
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, clear_trace,
    CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_trace_log_clear, "IU",
    "Clear SCTP Logging buffer");
#endif
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, udp_tunneling_port,
    CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_udp_tunneling, "IU",
    SCTPCTL_UDP_TUNNELING_PORT_DESC);
SCTP_UINT_SYSCTL(enable_sack_immediately, sctp_enable_sack_immediately, SCTPCTL_SACK_IMMEDIATELY_ENABLE)
SCTP_UINT_SYSCTL(nat_friendly_init, sctp_inits_include_nat_friendly, SCTPCTL_NAT_FRIENDLY_INITS)
SCTP_UINT_SYSCTL(vtag_time_wait, sctp_vtag_time_wait, SCTPCTL_TIME_WAIT)
SCTP_UINT_SYSCTL(buffer_splitting, sctp_buffer_splitting, SCTPCTL_BUFFER_SPLITTING)
SCTP_UINT_SYSCTL(initial_cwnd, sctp_initial_cwnd, SCTPCTL_INITIAL_CWND)
SCTP_UINT_SYSCTL(rttvar_bw, sctp_rttvar_bw, SCTPCTL_RTTVAR_BW)
SCTP_UINT_SYSCTL(rttvar_rtt, sctp_rttvar_rtt, SCTPCTL_RTTVAR_RTT)
SCTP_UINT_SYSCTL(rttvar_eqret, sctp_rttvar_eqret, SCTPCTL_RTTVAR_EQRET)
SCTP_UINT_SYSCTL(rttvar_steady_step, sctp_steady_step, SCTPCTL_RTTVAR_STEADYS)
SCTP_UINT_SYSCTL(use_dcccecn, sctp_use_dccc_ecn, SCTPCTL_RTTVAR_DCCCECN)
SCTP_UINT_SYSCTL(blackhole, sctp_blackhole, SCTPCTL_BLACKHOLE)
SCTP_UINT_SYSCTL(sendall_limit, sctp_sendall_limit, SCTPCTL_SENDALL_LIMIT)
SCTP_UINT_SYSCTL(diag_info_code, sctp_diag_info_code, SCTPCTL_DIAG_INFO_CODE)
#ifdef SCTP_DEBUG
SCTP_UINT_SYSCTL(debug, sctp_debug_on, SCTPCTL_DEBUG)
#endif
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, stats,
    CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_stats, "S,sctpstat",
    "SCTP statistics (struct sctp_stat)");
SYSCTL_PROC(_net_inet_sctp, OID_AUTO, assoclist,
    CTLFLAG_VNET | CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
    NULL, 0, sctp_sysctl_handle_assoclist, "S,xassoc",
    "List of active SCTP associations");