2006-11-03 15:23:16 +00:00
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/*-
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* Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* a) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* b) Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* c) Neither the name of Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ipsec.h"
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#include "opt_compat.h"
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#include "opt_inet6.h"
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#include "opt_inet.h"
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#include "opt_sctp.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/limits.h>
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#include <machine/cpu.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#endif /* INET6 */
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#include <netinet/ip_icmp.h>
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#include <netinet/icmp_var.h>
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#include <netinet/sctp_os.h>
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#include <netinet/sctp_var.h>
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#include <netinet/sctp_pcb.h>
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#include <netinet/sctp_header.h>
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#include <netinet/sctputil.h>
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#include <netinet/sctp_output.h>
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#include <netinet/sctp_input.h>
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#include <netinet/sctp_auth.h>
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#include <netinet/sctp_indata.h>
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#include <netinet/sctp_asconf.h>
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#include <netinet/ip_options.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#include <netkey/key.h>
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#endif /* IPSEC */
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#ifdef SCTP_DEBUG
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extern uint32_t sctp_debug_on;
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#endif
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static void
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sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
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{
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struct sctp_nets *net;
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SCTP_TCB_LOCK_ASSERT(stcb);
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TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
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if ((callout_pending(&net->rxt_timer.timer)) &&
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(net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE)) {
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sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
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stcb->sctp_ep,
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stcb,
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net);
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}
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}
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}
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/* INIT handler */
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static void
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sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
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struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
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struct sctp_nets *net)
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{
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struct sctp_init *init;
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struct mbuf *op_err;
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uint32_t init_limit;
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#ifdef SCTP_DEBUG
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if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
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printf("sctp_handle_init: handling INIT tcb:%p\n", stcb);
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}
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#endif
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op_err = NULL;
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init = &cp->init;
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/* First are we accepting? */
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if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
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#ifdef SCTP_DEBUG
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if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
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printf("sctp_handle_init: Abort, so_qlimit:%d\n", inp->sctp_socket->so_qlimit);
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}
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#endif
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/*
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* FIX ME ?? What about TCP model and we have a
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* match/restart case?
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*/
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sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
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return;
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}
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if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
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/* Invalid length */
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op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
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sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
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return;
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}
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/* validate parameters */
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if (init->initiate_tag == 0) {
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/* protocol error... send abort */
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op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
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sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
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return;
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}
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if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
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/* invalid parameter... send abort */
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op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
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sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
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return;
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}
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if (init->num_inbound_streams == 0) {
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/* protocol error... send abort */
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op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
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sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
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return;
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}
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if (init->num_outbound_streams == 0) {
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/* protocol error... send abort */
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op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
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sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
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return;
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}
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init_limit = offset + ntohs(cp->ch.chunk_length);
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if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
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init_limit)) {
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/* auth parameter(s) error... send abort */
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sctp_abort_association(inp, stcb, m, iphlen, sh, NULL);
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return;
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}
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/* send an INIT-ACK w/cookie */
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#ifdef SCTP_DEBUG
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if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
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printf("sctp_handle_init: sending INIT-ACK\n");
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}
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#endif
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sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp);
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}
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/*
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* process peer "INIT/INIT-ACK" chunk returns value < 0 on error
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*/
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static int
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sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
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struct sctp_nets *net)
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{
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struct sctp_init *init;
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struct sctp_association *asoc;
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struct sctp_nets *lnet;
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unsigned int i;
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init = &cp->init;
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asoc = &stcb->asoc;
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/* save off parameters */
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asoc->peer_vtag = ntohl(init->initiate_tag);
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asoc->peers_rwnd = ntohl(init->a_rwnd);
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if (TAILQ_FIRST(&asoc->nets)) {
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/* update any ssthresh's that may have a default */
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TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
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lnet->ssthresh = asoc->peers_rwnd;
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#if defined(SCTP_CWND_MONITOR) || defined(SCTP_CWND_LOGGING)
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sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
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#endif
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}
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}
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if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
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unsigned int newcnt;
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struct sctp_stream_out *outs;
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struct sctp_stream_queue_pending *sp;
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/* cut back on number of streams */
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newcnt = ntohs(init->num_inbound_streams);
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/* This if is probably not needed but I am cautious */
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if (asoc->strmout) {
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/* First make sure no data chunks are trapped */
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for (i = newcnt; i < asoc->pre_open_streams; i++) {
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outs = &asoc->strmout[i];
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sp = TAILQ_FIRST(&outs->outqueue);
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while (sp) {
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TAILQ_REMOVE(&outs->outqueue, sp,
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next);
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asoc->stream_queue_cnt--;
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sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
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stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
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sp);
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if (sp->data) {
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sctp_m_freem(sp->data);
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sp->data = NULL;
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}
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sctp_free_remote_addr(sp->net);
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sp->net = NULL;
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/* Free the chunk */
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2006-11-03 23:04:34 +00:00
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printf("sp:%p tcb:%p weird free case\n",
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2006-11-04 08:19:01 +00:00
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sp, stcb);
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2006-11-03 15:23:16 +00:00
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sctp_free_a_strmoq(stcb, sp);
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sp = TAILQ_FIRST(&outs->outqueue);
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}
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}
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}
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/* cut back the count and abandon the upper streams */
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asoc->pre_open_streams = newcnt;
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}
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asoc->streamincnt = ntohs(init->num_outbound_streams);
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if (asoc->streamincnt > MAX_SCTP_STREAMS) {
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asoc->streamincnt = MAX_SCTP_STREAMS;
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}
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asoc->streamoutcnt = asoc->pre_open_streams;
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/* init tsn's */
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asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
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#ifdef SCTP_MAP_LOGGING
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sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
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#endif
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/* This is the next one we expect */
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asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
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asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
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asoc->cumulative_tsn = asoc->asconf_seq_in;
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asoc->last_echo_tsn = asoc->asconf_seq_in;
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asoc->advanced_peer_ack_point = asoc->last_acked_seq;
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/* open the requested streams */
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if (asoc->strmin != NULL) {
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/* Free the old ones */
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SCTP_FREE(asoc->strmin);
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}
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SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
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sizeof(struct sctp_stream_in), "StreamsIn");
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if (asoc->strmin == NULL) {
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/* we didn't get memory for the streams! */
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#ifdef SCTP_DEBUG
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if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
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printf("process_init: couldn't get memory for the streams!\n");
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}
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#endif
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return (-1);
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}
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for (i = 0; i < asoc->streamincnt; i++) {
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asoc->strmin[i].stream_no = i;
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asoc->strmin[i].last_sequence_delivered = 0xffff;
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/*
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* U-stream ranges will be set when the cookie is unpacked.
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* Or for the INIT sender they are un set (if pr-sctp not
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* supported) when the INIT-ACK arrives.
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*/
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TAILQ_INIT(&asoc->strmin[i].inqueue);
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/*
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* we are not on any wheel, pr-sctp streams will go on the
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* wheel when they have data waiting for reorder.
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*/
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asoc->strmin[i].next_spoke.tqe_next = 0;
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asoc->strmin[i].next_spoke.tqe_prev = 0;
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}
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/*
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* load_address_from_init will put the addresses into the
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* association when the COOKIE is processed or the INIT-ACK is
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* processed. Both types of COOKIE's existing and new call this
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* routine. It will remove addresses that are no longer in the
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* association (for the restarting case where addresses are
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* removed). Up front when the INIT arrives we will discard it if it
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* is a restart and new addresses have been added.
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*/
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return (0);
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}
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/*
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* INIT-ACK message processing/consumption returns value < 0 on error
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*/
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static int
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sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
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struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
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struct sctp_nets *net)
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{
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struct sctp_association *asoc;
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struct mbuf *op_err;
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|
|
int retval, abort_flag;
|
|
|
|
uint32_t initack_limit;
|
|
|
|
|
|
|
|
/* First verify that we have no illegal param's */
|
|
|
|
abort_flag = 0;
|
|
|
|
op_err = NULL;
|
|
|
|
|
|
|
|
op_err = sctp_arethere_unrecognized_parameters(m,
|
|
|
|
(offset + sizeof(struct sctp_init_chunk)),
|
|
|
|
&abort_flag, (struct sctp_chunkhdr *)cp);
|
|
|
|
if (abort_flag) {
|
|
|
|
/* Send an abort and notify peer */
|
|
|
|
if (op_err != NULL) {
|
|
|
|
sctp_send_operr_to(m, iphlen, op_err, cp->init.initiate_tag);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Just notify (abort_assoc does this if we send an
|
|
|
|
* abort).
|
|
|
|
*/
|
|
|
|
sctp_abort_notification(stcb, 0);
|
|
|
|
/*
|
|
|
|
* No sense in further INIT's since we will get the
|
|
|
|
* same param back
|
|
|
|
*/
|
|
|
|
sctp_free_assoc(stcb->sctp_ep, stcb, 0);
|
|
|
|
}
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
/* process the peer's parameters in the INIT-ACK */
|
|
|
|
retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
|
|
|
|
if (retval < 0) {
|
|
|
|
return (retval);
|
|
|
|
}
|
|
|
|
initack_limit = offset + ntohs(cp->ch.chunk_length);
|
|
|
|
/* load all addresses */
|
|
|
|
if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
|
|
|
|
(offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
|
|
|
|
NULL))) {
|
|
|
|
/* Huh, we should abort */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Load addresses from INIT causes an abort %d\n", retval);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
|
|
|
|
NULL);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
|
|
|
|
stcb->asoc.local_hmacs);
|
|
|
|
if (op_err) {
|
|
|
|
sctp_queue_op_err(stcb, op_err);
|
|
|
|
/* queuing will steal away the mbuf chain to the out queue */
|
|
|
|
op_err = NULL;
|
|
|
|
}
|
|
|
|
/* extract the cookie and queue it to "echo" it back... */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
net->error_count = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Cancel the INIT timer, We do this first before queueing the
|
|
|
|
* cookie. We always cancel at the primary to assue that we are
|
|
|
|
* canceling the timer started by the INIT which always goes to the
|
|
|
|
* primary.
|
|
|
|
*/
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
|
|
|
|
asoc->primary_destination);
|
|
|
|
|
|
|
|
retval = sctp_send_cookie_echo(m, offset, stcb, net);
|
|
|
|
if (retval < 0) {
|
|
|
|
/*
|
|
|
|
* No cookie, we probably should send a op error. But in any
|
|
|
|
* case if there is no cookie in the INIT-ACK, we can
|
|
|
|
* abandon the peer, its broke.
|
|
|
|
*/
|
|
|
|
if (retval == -3) {
|
|
|
|
/* We abort with an error of missing mandatory param */
|
|
|
|
struct mbuf *op_err;
|
|
|
|
|
|
|
|
op_err =
|
|
|
|
sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
|
|
|
|
if (op_err) {
|
|
|
|
/*
|
|
|
|
* Expand beyond to include the mandatory
|
|
|
|
* param cookie
|
|
|
|
*/
|
|
|
|
struct sctp_inv_mandatory_param *mp;
|
|
|
|
|
|
|
|
op_err->m_len =
|
|
|
|
sizeof(struct sctp_inv_mandatory_param);
|
|
|
|
mp = mtod(op_err,
|
|
|
|
struct sctp_inv_mandatory_param *);
|
|
|
|
/* Subtract the reserved param */
|
|
|
|
mp->length =
|
|
|
|
htons(sizeof(struct sctp_inv_mandatory_param) - 2);
|
|
|
|
mp->num_param = htonl(1);
|
|
|
|
mp->param = htons(SCTP_STATE_COOKIE);
|
|
|
|
mp->resv = 0;
|
|
|
|
}
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
|
|
|
|
sh, op_err);
|
|
|
|
}
|
|
|
|
return (retval);
|
|
|
|
}
|
|
|
|
/* calculate the RTO */
|
|
|
|
net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered);
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
struct sockaddr_storage store;
|
|
|
|
struct sockaddr_in *sin;
|
|
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
struct sctp_nets *r_net;
|
|
|
|
struct timeval tv;
|
|
|
|
|
|
|
|
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
|
|
|
|
/* Invalid length */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
sin = (struct sockaddr_in *)&store;
|
|
|
|
sin6 = (struct sockaddr_in6 *)&store;
|
|
|
|
|
|
|
|
memset(&store, 0, sizeof(store));
|
|
|
|
if (cp->heartbeat.hb_info.addr_family == AF_INET &&
|
|
|
|
cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
|
|
|
|
sin->sin_family = cp->heartbeat.hb_info.addr_family;
|
|
|
|
sin->sin_len = cp->heartbeat.hb_info.addr_len;
|
|
|
|
sin->sin_port = stcb->rport;
|
|
|
|
memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
|
|
|
|
sizeof(sin->sin_addr));
|
|
|
|
} else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
|
|
|
|
cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
|
|
|
|
sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
|
|
|
|
sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
|
|
|
|
sin6->sin6_port = stcb->rport;
|
|
|
|
memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
|
|
|
|
sizeof(sin6->sin6_addr));
|
|
|
|
} else {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
|
|
|
|
if (r_net == NULL) {
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Huh? I can't find the address I sent it to, discard\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
|
|
|
|
(r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
|
|
|
|
(r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
|
|
|
|
/*
|
|
|
|
* If the its a HB and it's random value is correct when can
|
|
|
|
* confirm the destination.
|
|
|
|
*/
|
|
|
|
r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
|
|
|
|
stcb, 0, (void *)r_net);
|
|
|
|
}
|
|
|
|
r_net->error_count = 0;
|
|
|
|
r_net->hb_responded = 1;
|
|
|
|
tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
|
|
|
|
tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
|
|
|
|
if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
|
|
|
|
r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
|
|
|
|
r_net->dest_state |= SCTP_ADDR_REACHABLE;
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
|
|
|
|
SCTP_HEARTBEAT_SUCCESS, (void *)r_net);
|
|
|
|
/* now was it the primary? if so restore */
|
|
|
|
if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
|
|
|
|
sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Now lets do a RTO with this */
|
|
|
|
r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_abort(struct sctp_abort_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_abort: handling ABORT\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (stcb == NULL)
|
|
|
|
return;
|
|
|
|
/* verify that the destination addr is in the association */
|
|
|
|
/* ignore abort for addresses being deleted */
|
|
|
|
|
|
|
|
/* stop any receive timers */
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net);
|
|
|
|
/* notify user of the abort and clean up... */
|
|
|
|
sctp_abort_notification(stcb, 0);
|
|
|
|
/* free the tcb */
|
|
|
|
SCTP_STAT_INCR_COUNTER32(sctps_aborted);
|
|
|
|
if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
|
|
|
|
(SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
|
|
|
|
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
|
|
|
|
}
|
|
|
|
sctp_free_assoc(stcb->sctp_ep, stcb, 0);
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_abort: finished\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
int some_on_streamwheel;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_shutdown: handling SHUTDOWN\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (stcb == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) ||
|
|
|
|
(SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
|
|
|
|
/* Shutdown NOT the expected size */
|
|
|
|
return;
|
|
|
|
} else {
|
|
|
|
sctp_update_acked(stcb, cp, net, abort_flag);
|
|
|
|
}
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
if (stcb->asoc.control_pdapi) {
|
|
|
|
/*
|
|
|
|
* With a normal shutdown we assume the end of last record.
|
|
|
|
*/
|
|
|
|
SCTP_INP_READ_LOCK(stcb->sctp_ep);
|
|
|
|
stcb->asoc.control_pdapi->end_added = 1;
|
|
|
|
if (stcb->asoc.control_pdapi->tail_mbuf) {
|
|
|
|
stcb->asoc.control_pdapi->tail_mbuf->m_flags |= M_EOR;
|
|
|
|
}
|
|
|
|
stcb->asoc.control_pdapi = NULL;
|
|
|
|
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
|
|
|
|
}
|
|
|
|
/* goto SHUTDOWN_RECEIVED state to block new requests */
|
|
|
|
if (stcb->sctp_socket) {
|
|
|
|
if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
|
|
|
|
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
|
|
|
|
asoc->state = SCTP_STATE_SHUTDOWN_RECEIVED;
|
|
|
|
/*
|
|
|
|
* notify upper layer that peer has initiated a
|
|
|
|
* shutdown
|
|
|
|
*/
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL);
|
|
|
|
|
|
|
|
/* reset time */
|
|
|
|
SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
|
|
|
|
/*
|
|
|
|
* stop the shutdown timer, since we WILL move to
|
|
|
|
* SHUTDOWN-ACK-SENT.
|
|
|
|
*/
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net);
|
|
|
|
}
|
|
|
|
/* Now are we there yet? */
|
|
|
|
some_on_streamwheel = 0;
|
|
|
|
if (!TAILQ_EMPTY(&asoc->out_wheel)) {
|
|
|
|
/* Check to see if some data queued */
|
|
|
|
struct sctp_stream_out *outs;
|
|
|
|
|
|
|
|
TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
|
|
|
|
if (!TAILQ_EMPTY(&outs->outqueue)) {
|
|
|
|
some_on_streamwheel = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (!TAILQ_EMPTY(&asoc->send_queue) ||
|
|
|
|
!TAILQ_EMPTY(&asoc->sent_queue) ||
|
|
|
|
some_on_streamwheel) {
|
|
|
|
/* By returning we will push more data out */
|
|
|
|
return;
|
|
|
|
} else {
|
|
|
|
/* no outstanding data to send, so move on... */
|
|
|
|
/* send SHUTDOWN-ACK */
|
|
|
|
sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
|
|
|
|
/* move to SHUTDOWN-ACK-SENT state */
|
|
|
|
if (asoc->state == SCTP_STATE_SHUTDOWN_RECEIVED) {
|
|
|
|
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
|
|
|
|
}
|
|
|
|
asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
|
|
|
|
|
|
|
|
/* start SHUTDOWN timer */
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
|
|
|
|
stcb, net);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (stcb == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
/* process according to association state */
|
|
|
|
if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
|
|
|
|
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
|
|
|
|
/* unexpected SHUTDOWN-ACK... so ignore... */
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (stcb->asoc.control_pdapi) {
|
|
|
|
/*
|
|
|
|
* With a normal shutdown we assume the end of last record.
|
|
|
|
*/
|
|
|
|
SCTP_INP_READ_LOCK(stcb->sctp_ep);
|
|
|
|
stcb->asoc.control_pdapi->end_added = 1;
|
|
|
|
if (stcb->asoc.control_pdapi->tail_mbuf) {
|
|
|
|
stcb->asoc.control_pdapi->tail_mbuf->m_flags |= M_EOR;
|
|
|
|
}
|
|
|
|
stcb->asoc.control_pdapi = NULL;
|
|
|
|
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
|
|
|
|
}
|
|
|
|
/* are the queues empty? */
|
|
|
|
if (!TAILQ_EMPTY(&asoc->send_queue) ||
|
|
|
|
!TAILQ_EMPTY(&asoc->sent_queue) ||
|
|
|
|
!TAILQ_EMPTY(&asoc->out_wheel)) {
|
|
|
|
sctp_report_all_outbound(stcb);
|
|
|
|
}
|
|
|
|
/* stop the timer */
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net);
|
|
|
|
/* send SHUTDOWN-COMPLETE */
|
|
|
|
sctp_send_shutdown_complete(stcb, net);
|
|
|
|
/* notify upper layer protocol */
|
|
|
|
if (stcb->sctp_socket) {
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL);
|
|
|
|
if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
|
|
|
|
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
|
|
|
|
/* Set the connected flag to disconnected */
|
|
|
|
stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
|
|
|
|
/* free the TCB but first save off the ep */
|
|
|
|
sctp_free_assoc(stcb->sctp_ep, stcb, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Skip past the param header and then we will find the chunk that caused the
|
|
|
|
* problem. There are two possiblities ASCONF or FWD-TSN other than that and
|
|
|
|
* our peer must be broken.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
|
|
|
|
struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
struct sctp_chunkhdr *chk;
|
|
|
|
|
|
|
|
chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
|
|
|
|
switch (chk->chunk_type) {
|
|
|
|
case SCTP_ASCONF_ACK:
|
|
|
|
case SCTP_ASCONF:
|
|
|
|
sctp_asconf_cleanup(stcb, net);
|
|
|
|
break;
|
|
|
|
case SCTP_FORWARD_CUM_TSN:
|
|
|
|
stcb->asoc.peer_supports_prsctp = 0;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("Peer does not support chunk type %d(%x)??\n",
|
|
|
|
chk->chunk_type, (uint32_t) chk->chunk_type);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Skip past the param header and then we will find the param that caused the
|
|
|
|
* problem. There are a number of param's in a ASCONF OR the prsctp param
|
|
|
|
* these will turn of specific features.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
|
|
|
|
{
|
|
|
|
struct sctp_paramhdr *pbad;
|
|
|
|
|
|
|
|
pbad = phdr + 1;
|
|
|
|
switch (ntohs(pbad->param_type)) {
|
|
|
|
/* pr-sctp draft */
|
|
|
|
case SCTP_PRSCTP_SUPPORTED:
|
|
|
|
stcb->asoc.peer_supports_prsctp = 0;
|
|
|
|
break;
|
|
|
|
case SCTP_SUPPORTED_CHUNK_EXT:
|
|
|
|
break;
|
|
|
|
/* draft-ietf-tsvwg-addip-sctp */
|
|
|
|
case SCTP_ECN_NONCE_SUPPORTED:
|
|
|
|
stcb->asoc.peer_supports_ecn_nonce = 0;
|
|
|
|
stcb->asoc.ecn_nonce_allowed = 0;
|
|
|
|
stcb->asoc.ecn_allowed = 0;
|
|
|
|
break;
|
|
|
|
case SCTP_ADD_IP_ADDRESS:
|
|
|
|
case SCTP_DEL_IP_ADDRESS:
|
|
|
|
case SCTP_SET_PRIM_ADDR:
|
|
|
|
stcb->asoc.peer_supports_asconf = 0;
|
|
|
|
break;
|
|
|
|
case SCTP_SUCCESS_REPORT:
|
|
|
|
case SCTP_ERROR_CAUSE_IND:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("Huh, the peer does not support success? or error cause?\n");
|
|
|
|
printf("Turning off ASCONF to this strange peer\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
stcb->asoc.peer_supports_asconf = 0;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("Peer does not support param type %d(%x)??\n",
|
|
|
|
pbad->param_type, (uint32_t) pbad->param_type);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
sctp_handle_error(struct sctp_chunkhdr *ch,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
int chklen;
|
|
|
|
struct sctp_paramhdr *phdr;
|
|
|
|
uint16_t error_type;
|
|
|
|
uint16_t error_len;
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
|
|
|
|
int adjust;
|
|
|
|
|
|
|
|
/* parse through all of the errors and process */
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
phdr = (struct sctp_paramhdr *)((caddr_t)ch +
|
|
|
|
sizeof(struct sctp_chunkhdr));
|
|
|
|
chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
|
|
|
|
while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
|
|
|
|
/* Process an Error Cause */
|
|
|
|
error_type = ntohs(phdr->param_type);
|
|
|
|
error_len = ntohs(phdr->param_length);
|
|
|
|
if ((error_len > chklen) || (error_len == 0)) {
|
|
|
|
/* invalid param length for this param */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Bogus length in error param- chunk left:%d errorlen:%d\n",
|
|
|
|
chklen, error_len);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
switch (error_type) {
|
|
|
|
case SCTP_CAUSE_INVALID_STREAM:
|
|
|
|
case SCTP_CAUSE_MISSING_PARAM:
|
|
|
|
case SCTP_CAUSE_INVALID_PARAM:
|
|
|
|
case SCTP_CAUSE_NO_USER_DATA:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Software error we got a %d back? We have a bug :/ (or do they?)\n",
|
|
|
|
error_type);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_STALE_COOKIE:
|
|
|
|
/*
|
|
|
|
* We only act if we have echoed a cookie and are
|
|
|
|
* waiting.
|
|
|
|
*/
|
|
|
|
if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
|
|
|
|
int *p;
|
|
|
|
|
|
|
|
p = (int *)((caddr_t)phdr + sizeof(*phdr));
|
|
|
|
/* Save the time doubled */
|
|
|
|
asoc->cookie_preserve_req = ntohl(*p) << 1;
|
|
|
|
asoc->stale_cookie_count++;
|
|
|
|
if (asoc->stale_cookie_count >
|
|
|
|
asoc->max_init_times) {
|
|
|
|
sctp_abort_notification(stcb, 0);
|
|
|
|
/* now free the asoc */
|
|
|
|
sctp_free_assoc(stcb->sctp_ep, stcb, 0);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
/* blast back to INIT state */
|
|
|
|
asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
|
|
|
|
asoc->state |= SCTP_STATE_COOKIE_WAIT;
|
|
|
|
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
sctp_send_initiate(stcb->sctp_ep, stcb);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_UNRESOLVABLE_ADDR:
|
|
|
|
/*
|
|
|
|
* Nothing we can do here, we don't do hostname
|
|
|
|
* addresses so if the peer does not like my IPv6
|
|
|
|
* (or IPv4 for that matter) it does not matter. If
|
|
|
|
* they don't support that type of address, they can
|
|
|
|
* NOT possibly get that packet type... i.e. with no
|
|
|
|
* IPv6 you can't recieve a IPv6 packet. so we can
|
|
|
|
* safely ignore this one. If we ever added support
|
|
|
|
* for HOSTNAME Addresses, then we would need to do
|
|
|
|
* something here.
|
|
|
|
*/
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_UNRECOG_CHUNK:
|
|
|
|
sctp_process_unrecog_chunk(stcb, phdr, net);
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_UNRECOG_PARAM:
|
|
|
|
sctp_process_unrecog_param(stcb, phdr);
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
|
|
|
|
/*
|
|
|
|
* We ignore this since the timer will drive out a
|
|
|
|
* new cookie anyway and there timer will drive us
|
|
|
|
* to send a SHUTDOWN_COMPLETE. We can't send one
|
|
|
|
* here since we don't have their tag.
|
|
|
|
*/
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_DELETING_LAST_ADDR:
|
|
|
|
case SCTP_CAUSE_RESOURCE_SHORTAGE:
|
|
|
|
case SCTP_CAUSE_DELETING_SRC_ADDR:
|
|
|
|
/*
|
|
|
|
* We should NOT get these here, but in a
|
|
|
|
* ASCONF-ACK. n
|
|
|
|
*/
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("Peer sends ASCONF errors in a Operational Error?<%d>?\n",
|
|
|
|
error_type);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
case SCTP_CAUSE_OUT_OF_RESC:
|
|
|
|
/*
|
|
|
|
* And what, pray tell do we do with the fact that
|
|
|
|
* the peer is out of resources? Not really sure we
|
|
|
|
* could do anything but abort. I suspect this n *
|
|
|
|
* should have came WITH an abort instead of in a
|
|
|
|
* OP-ERROR.
|
|
|
|
*/
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
/* don't know what this error cause is... */
|
|
|
|
printf("sctp_handle_error: unknown error type = 0x%xh\n",
|
|
|
|
error_type);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
adjust = SCTP_SIZE32(error_len);
|
|
|
|
chklen -= adjust;
|
|
|
|
phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
|
|
|
|
struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
|
|
|
|
struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
struct sctp_init_ack *init_ack;
|
|
|
|
int *state;
|
|
|
|
struct mbuf *op_err;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_init_ack: handling INIT-ACK\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (stcb == NULL) {
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_init_ack: TCB is null\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
|
|
|
|
/* Invalid length */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
|
|
|
|
op_err);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
init_ack = &cp->init;
|
|
|
|
/* validate parameters */
|
|
|
|
if (init_ack->initiate_tag == 0) {
|
|
|
|
/* protocol error... send an abort */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
|
|
|
|
op_err);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
|
|
|
|
/* protocol error... send an abort */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
|
|
|
|
op_err);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
if (init_ack->num_inbound_streams == 0) {
|
|
|
|
/* protocol error... send an abort */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
|
|
|
|
op_err);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
if (init_ack->num_outbound_streams == 0) {
|
|
|
|
/* protocol error... send an abort */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
|
|
|
|
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
|
|
|
|
op_err);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
/* process according to association state... */
|
|
|
|
state = &stcb->asoc.state;
|
|
|
|
switch (*state & SCTP_STATE_MASK) {
|
|
|
|
case SCTP_STATE_COOKIE_WAIT:
|
|
|
|
/* this is the expected state for this chunk */
|
|
|
|
/* process the INIT-ACK parameters */
|
|
|
|
if (stcb->asoc.primary_destination->dest_state &
|
|
|
|
SCTP_ADDR_UNCONFIRMED) {
|
|
|
|
/*
|
|
|
|
* The primary is where we sent the INIT, we can
|
|
|
|
* always consider it confirmed when the INIT-ACK is
|
|
|
|
* returned. Do this before we load addresses
|
|
|
|
* though.
|
|
|
|
*/
|
|
|
|
stcb->asoc.primary_destination->dest_state &=
|
|
|
|
~SCTP_ADDR_UNCONFIRMED;
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
|
|
|
|
stcb, 0, (void *)stcb->asoc.primary_destination);
|
|
|
|
}
|
|
|
|
if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, net
|
|
|
|
) < 0) {
|
|
|
|
/* error in parsing parameters */
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
/* update our state */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("moving to COOKIE-ECHOED state\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (*state & SCTP_STATE_SHUTDOWN_PENDING) {
|
|
|
|
*state = SCTP_STATE_COOKIE_ECHOED |
|
|
|
|
SCTP_STATE_SHUTDOWN_PENDING;
|
|
|
|
} else {
|
|
|
|
*state = SCTP_STATE_COOKIE_ECHOED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* reset the RTO calc */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
|
|
|
|
/*
|
|
|
|
* collapse the init timer back in case of a exponential
|
|
|
|
* backoff n
|
|
|
|
*/
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
|
|
|
|
stcb, net);
|
|
|
|
/*
|
|
|
|
* the send at the end of the inbound data processing will
|
|
|
|
* cause the cookie to be sent
|
|
|
|
*/
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_SHUTDOWN_SENT:
|
|
|
|
/* incorrect state... discard */
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_COOKIE_ECHOED:
|
|
|
|
/* incorrect state... discard */
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_OPEN:
|
|
|
|
/* incorrect state... discard */
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_EMPTY:
|
|
|
|
case SCTP_STATE_INUSE:
|
|
|
|
default:
|
|
|
|
/* incorrect state... discard */
|
|
|
|
return (-1);
|
|
|
|
break;
|
|
|
|
} /* end switch asoc state */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Leaving handle-init-ack end\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* handle a state cookie for an existing association m: input packet mbuf
|
|
|
|
* chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
|
|
|
|
* "split" mbuf and the cookie signature does not exist offset: offset into
|
|
|
|
* mbuf to the cookie-echo chunk
|
|
|
|
*/
|
|
|
|
static struct sctp_tcb *
|
|
|
|
sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
|
|
|
|
struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
|
|
|
|
struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
|
|
struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
struct sctp_init_chunk *init_cp, init_buf;
|
|
|
|
struct sctp_init_ack_chunk *initack_cp, initack_buf;
|
|
|
|
int chk_length;
|
|
|
|
int init_offset, initack_offset;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
/* I know that the TCB is non-NULL from the caller */
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
|
|
|
|
if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
|
|
|
|
/* SHUTDOWN came in after sending INIT-ACK */
|
|
|
|
struct mbuf *op_err;
|
|
|
|
struct sctp_paramhdr *ph;
|
|
|
|
|
|
|
|
sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
|
|
|
|
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
|
|
|
|
1, M_DONTWAIT, 1, MT_DATA);
|
|
|
|
if (op_err == NULL) {
|
|
|
|
/* FOOBAR */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* pre-reserve some space */
|
|
|
|
op_err->m_data += sizeof(struct ip6_hdr);
|
|
|
|
op_err->m_data += sizeof(struct sctphdr);
|
|
|
|
op_err->m_data += sizeof(struct sctp_chunkhdr);
|
|
|
|
/* Set the len */
|
|
|
|
op_err->m_len = op_err->m_pkthdr.len = sizeof(struct sctp_paramhdr);
|
|
|
|
ph = mtod(op_err, struct sctp_paramhdr *);
|
|
|
|
ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
|
|
|
|
ph->param_length = htons(sizeof(struct sctp_paramhdr));
|
|
|
|
sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* find and validate the INIT chunk in the cookie (peer's info) the
|
|
|
|
* INIT should start after the cookie-echo header struct (chunk
|
|
|
|
* header, state cookie header struct)
|
|
|
|
*/
|
|
|
|
init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
|
|
|
|
|
|
|
|
init_cp = (struct sctp_init_chunk *)
|
|
|
|
sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
|
|
|
|
(uint8_t *) & init_buf);
|
|
|
|
if (init_cp == NULL) {
|
|
|
|
/* could not pull a INIT chunk in cookie */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
chk_length = ntohs(init_cp->ch.chunk_length);
|
|
|
|
if (init_cp->ch.chunk_type != SCTP_INITIATION) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* find and validate the INIT-ACK chunk in the cookie (my info) the
|
|
|
|
* INIT-ACK follows the INIT chunk
|
|
|
|
*/
|
|
|
|
initack_offset = init_offset + SCTP_SIZE32(chk_length);
|
|
|
|
initack_cp = (struct sctp_init_ack_chunk *)
|
|
|
|
sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
|
|
|
|
(uint8_t *) & initack_buf);
|
|
|
|
if (initack_cp == NULL) {
|
|
|
|
/* could not pull INIT-ACK chunk in cookie */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
chk_length = ntohs(initack_cp->ch.chunk_length);
|
|
|
|
if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
|
|
|
|
(ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
|
|
|
|
/*
|
|
|
|
* case D in Section 5.2.4 Table 2: MMAA process accordingly
|
|
|
|
* to get into the OPEN state
|
|
|
|
*/
|
|
|
|
switch SCTP_GET_STATE
|
|
|
|
(asoc) {
|
|
|
|
case SCTP_STATE_COOKIE_WAIT:
|
|
|
|
/*
|
|
|
|
* INIT was sent, but got got a COOKIE_ECHO with the
|
|
|
|
* correct tags... just accept it...
|
|
|
|
*/
|
|
|
|
/* First we must process the INIT !! */
|
|
|
|
retval = sctp_process_init(init_cp, stcb, net);
|
|
|
|
if (retval < 0) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* intentional fall through to below... */
|
|
|
|
|
|
|
|
case SCTP_STATE_COOKIE_ECHOED:
|
|
|
|
/* Duplicate INIT case */
|
|
|
|
/* we have already processed the INIT so no problem */
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
|
|
|
|
net);
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
/* update current state */
|
|
|
|
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
|
|
|
|
asoc->state = SCTP_STATE_OPEN |
|
|
|
|
SCTP_STATE_SHUTDOWN_PENDING;
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
|
|
|
|
stcb->sctp_ep, stcb, asoc->primary_destination);
|
|
|
|
|
|
|
|
} else if ((asoc->state & SCTP_STATE_SHUTDOWN_SENT) == 0) {
|
|
|
|
/* if ok, move to OPEN state */
|
|
|
|
asoc->state = SCTP_STATE_OPEN;
|
|
|
|
}
|
|
|
|
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
|
|
|
|
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
|
|
|
|
(inp->sctp_socket->so_qlimit == 0)
|
|
|
|
) {
|
|
|
|
/*
|
|
|
|
* Here is where collision would go if we
|
|
|
|
* did a connect() and instead got a
|
|
|
|
* init/init-ack/cookie done before the
|
|
|
|
* init-ack came back..
|
|
|
|
*/
|
|
|
|
stcb->sctp_ep->sctp_flags |=
|
|
|
|
SCTP_PCB_FLAGS_CONNECTED;
|
|
|
|
soisconnected(stcb->sctp_ep->sctp_socket);
|
|
|
|
}
|
|
|
|
/* notify upper layer */
|
|
|
|
*notification = SCTP_NOTIFY_ASSOC_UP;
|
|
|
|
/*
|
|
|
|
* since we did not send a HB make sure we don't
|
|
|
|
* double things
|
|
|
|
*/
|
|
|
|
net->hb_responded = 1;
|
|
|
|
|
|
|
|
if (stcb->asoc.sctp_autoclose_ticks &&
|
|
|
|
(sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
|
|
|
|
inp, stcb, NULL);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/*
|
|
|
|
* we're in the OPEN state (or beyond), so peer must
|
|
|
|
* have simply lost the COOKIE-ACK
|
|
|
|
*/
|
|
|
|
break;
|
|
|
|
} /* end switch */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We ignore the return code here.. not sure if we should
|
|
|
|
* somehow abort.. but we do have an existing asoc. This
|
|
|
|
* really should not fail.
|
|
|
|
*/
|
|
|
|
if (sctp_load_addresses_from_init(stcb, m, iphlen,
|
|
|
|
init_offset + sizeof(struct sctp_init_chunk),
|
|
|
|
initack_offset, sh, init_src)) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* respond with a COOKIE-ACK */
|
|
|
|
sctp_send_cookie_ack(stcb);
|
|
|
|
return (stcb);
|
|
|
|
} /* end if */
|
|
|
|
if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
|
|
|
|
ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
|
|
|
|
cookie->tie_tag_my_vtag == 0 &&
|
|
|
|
cookie->tie_tag_peer_vtag == 0) {
|
|
|
|
/*
|
|
|
|
* case C in Section 5.2.4 Table 2: XMOO silently discard
|
|
|
|
*/
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag &&
|
|
|
|
(ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag ||
|
|
|
|
init_cp->init.initiate_tag == 0)) {
|
|
|
|
/*
|
|
|
|
* case B in Section 5.2.4 Table 2: MXAA or MOAA my info
|
|
|
|
* should be ok, re-accept peer info
|
|
|
|
*/
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
/*
|
|
|
|
* since we did not send a HB make sure we don't double
|
|
|
|
* things
|
|
|
|
*/
|
|
|
|
net->hb_responded = 1;
|
|
|
|
if (stcb->asoc.sctp_autoclose_ticks &&
|
|
|
|
sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
|
|
|
|
NULL);
|
|
|
|
}
|
|
|
|
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
|
|
|
|
asoc->pre_open_streams =
|
|
|
|
ntohs(initack_cp->init.num_outbound_streams);
|
|
|
|
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
|
|
|
|
asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out =
|
|
|
|
asoc->init_seq_number;
|
|
|
|
asoc->last_cwr_tsn = asoc->init_seq_number - 1;
|
|
|
|
asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
|
|
|
|
asoc->str_reset_seq_in = asoc->init_seq_number;
|
|
|
|
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
|
|
|
|
|
|
|
|
/* process the INIT info (peer's info) */
|
|
|
|
retval = sctp_process_init(init_cp, stcb, net);
|
|
|
|
if (retval < 0) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (sctp_load_addresses_from_init(stcb, m, iphlen,
|
|
|
|
init_offset + sizeof(struct sctp_init_chunk),
|
|
|
|
initack_offset, sh, init_src)) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
|
|
|
|
(asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
|
|
|
|
*notification = SCTP_NOTIFY_ASSOC_UP;
|
|
|
|
|
|
|
|
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
|
|
|
|
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
|
|
|
|
(inp->sctp_socket->so_qlimit == 0)) {
|
|
|
|
stcb->sctp_ep->sctp_flags |=
|
|
|
|
SCTP_PCB_FLAGS_CONNECTED;
|
|
|
|
soisconnected(stcb->sctp_ep->sctp_socket);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
|
|
|
|
asoc->state = SCTP_STATE_OPEN |
|
|
|
|
SCTP_STATE_SHUTDOWN_PENDING;
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
|
|
|
|
stcb->sctp_ep, stcb, asoc->primary_destination);
|
|
|
|
|
|
|
|
} else {
|
|
|
|
asoc->state = SCTP_STATE_OPEN;
|
|
|
|
}
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
sctp_send_cookie_ack(stcb);
|
|
|
|
return (stcb);
|
|
|
|
}
|
|
|
|
if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
|
|
|
|
ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
|
|
|
|
cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
|
|
|
|
cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
|
|
|
|
cookie->tie_tag_peer_vtag != 0) {
|
|
|
|
struct sctpasochead *head;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* case A in Section 5.2.4 Table 2: XXMM (peer restarted)
|
|
|
|
*/
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
|
|
|
|
*sac_assoc_id = sctp_get_associd(stcb);
|
|
|
|
/* notify upper layer */
|
|
|
|
*notification = SCTP_NOTIFY_ASSOC_RESTART;
|
|
|
|
|
|
|
|
|
|
|
|
/* send up all the data */
|
|
|
|
sctp_report_all_outbound(stcb);
|
|
|
|
|
|
|
|
/* process the INIT-ACK info (my info) */
|
|
|
|
asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
|
|
|
|
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
|
|
|
|
|
|
|
|
/* pull from vtag hash */
|
|
|
|
LIST_REMOVE(stcb, sctp_asocs);
|
|
|
|
/* re-insert to new vtag position */
|
|
|
|
head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
|
|
|
|
sctppcbinfo.hashasocmark)];
|
|
|
|
/*
|
|
|
|
* put it in the bucket in the vtag hash of assoc's for the
|
|
|
|
* system
|
|
|
|
*/
|
|
|
|
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
|
|
|
|
|
|
|
|
/* Is this the first restart? */
|
|
|
|
if (stcb->asoc.in_restart_hash == 0) {
|
|
|
|
/* Ok add it to assoc_id vtag hash */
|
|
|
|
head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id,
|
|
|
|
sctppcbinfo.hashrestartmark)];
|
|
|
|
LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash);
|
|
|
|
stcb->asoc.in_restart_hash = 1;
|
|
|
|
}
|
|
|
|
asoc->pre_open_streams =
|
|
|
|
ntohs(initack_cp->init.num_outbound_streams);
|
|
|
|
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
|
|
|
|
asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
|
|
|
|
|
|
|
|
asoc->last_cwr_tsn = asoc->init_seq_number - 1;
|
|
|
|
asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
|
|
|
|
|
|
|
|
asoc->str_reset_seq_in = asoc->init_seq_number;
|
|
|
|
|
|
|
|
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
|
|
|
|
if (asoc->mapping_array)
|
|
|
|
memset(asoc->mapping_array, 0,
|
|
|
|
asoc->mapping_array_size);
|
|
|
|
/* process the INIT info (peer's info) */
|
|
|
|
retval = sctp_process_init(init_cp, stcb, net);
|
|
|
|
if (retval < 0) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* since we did not send a HB make sure we don't double
|
|
|
|
* things
|
|
|
|
*/
|
|
|
|
net->hb_responded = 1;
|
|
|
|
|
|
|
|
if (sctp_load_addresses_from_init(stcb, m, iphlen,
|
|
|
|
init_offset + sizeof(struct sctp_init_chunk),
|
|
|
|
initack_offset, sh, init_src)) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
|
|
|
|
asoc->state = SCTP_STATE_OPEN |
|
|
|
|
SCTP_STATE_SHUTDOWN_PENDING;
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
|
|
|
|
stcb->sctp_ep, stcb, asoc->primary_destination);
|
|
|
|
|
|
|
|
} else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
|
|
|
|
/* move to OPEN state, if not in SHUTDOWN_SENT */
|
|
|
|
asoc->state = SCTP_STATE_OPEN;
|
|
|
|
}
|
|
|
|
/* respond with a COOKIE-ACK */
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
sctp_send_cookie_ack(stcb);
|
|
|
|
|
|
|
|
return (stcb);
|
|
|
|
}
|
|
|
|
/* if we are not a restart we need the assoc_id field pop'd */
|
|
|
|
asoc->assoc_id = ntohl(initack_cp->init.initiate_tag);
|
|
|
|
|
|
|
|
/* all other cases... */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* handle a state cookie for a new association m: input packet mbuf chain--
|
|
|
|
* assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
|
|
|
|
* and the cookie signature does not exist offset: offset into mbuf to the
|
|
|
|
* cookie-echo chunk length: length of the cookie chunk to: where the init
|
|
|
|
* was from returns a new TCB
|
|
|
|
*/
|
|
|
|
static struct sctp_tcb *
|
|
|
|
sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
|
|
|
|
struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
|
|
|
|
struct sctp_inpcb *inp, struct sctp_nets **netp,
|
|
|
|
struct sockaddr *init_src, int *notification,
|
|
|
|
int auth_skipped, uint32_t auth_offset, uint32_t auth_len)
|
|
|
|
{
|
|
|
|
struct sctp_tcb *stcb;
|
|
|
|
struct sctp_init_chunk *init_cp, init_buf;
|
|
|
|
struct sctp_init_ack_chunk *initack_cp, initack_buf;
|
|
|
|
struct sockaddr_storage sa_store;
|
|
|
|
struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
|
|
|
|
struct sockaddr_in *sin;
|
|
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
int chk_length;
|
|
|
|
int init_offset, initack_offset, initack_limit;
|
|
|
|
int retval;
|
|
|
|
int error = 0;
|
|
|
|
uint32_t old_tag;
|
|
|
|
uint8_t chunk_buf[DEFAULT_CHUNK_BUFFER];
|
|
|
|
|
|
|
|
/*
|
|
|
|
* find and validate the INIT chunk in the cookie (peer's info) the
|
|
|
|
* INIT should start after the cookie-echo header struct (chunk
|
|
|
|
* header, state cookie header struct)
|
|
|
|
*/
|
|
|
|
init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
|
|
|
|
init_cp = (struct sctp_init_chunk *)
|
|
|
|
sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
|
|
|
|
(uint8_t *) & init_buf);
|
|
|
|
if (init_cp == NULL) {
|
|
|
|
/* could not pull a INIT chunk in cookie */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("process_cookie_new: could not pull INIT chunk hdr\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
chk_length = ntohs(init_cp->ch.chunk_length);
|
|
|
|
if (init_cp->ch.chunk_type != SCTP_INITIATION) {
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("HUH? process_cookie_new: could not find INIT chunk!\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
initack_offset = init_offset + SCTP_SIZE32(chk_length);
|
|
|
|
/*
|
|
|
|
* find and validate the INIT-ACK chunk in the cookie (my info) the
|
|
|
|
* INIT-ACK follows the INIT chunk
|
|
|
|
*/
|
|
|
|
initack_cp = (struct sctp_init_ack_chunk *)
|
|
|
|
sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
|
|
|
|
(uint8_t *) & initack_buf);
|
|
|
|
if (initack_cp == NULL) {
|
|
|
|
/* could not pull INIT-ACK chunk in cookie */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("process_cookie_new: could not pull INIT-ACK chunk hdr\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
chk_length = ntohs(initack_cp->ch.chunk_length);
|
|
|
|
if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* NOTE: We can't use the INIT_ACK's chk_length to determine the
|
|
|
|
* "initack_limit" value. This is because the chk_length field
|
|
|
|
* includes the length of the cookie, but the cookie is omitted when
|
|
|
|
* the INIT and INIT_ACK are tacked onto the cookie...
|
|
|
|
*/
|
|
|
|
initack_limit = offset + cookie_len;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* now that we know the INIT/INIT-ACK are in place, create a new TCB
|
|
|
|
* and popluate
|
|
|
|
*/
|
|
|
|
stcb = sctp_aloc_assoc(inp, init_src, 0, &error,
|
|
|
|
ntohl(initack_cp->init.initiate_tag));
|
|
|
|
if (stcb == NULL) {
|
|
|
|
struct mbuf *op_err;
|
|
|
|
|
|
|
|
/* memory problem? */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("process_cookie_new: no room for another TCB!\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
|
|
|
|
sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
|
|
|
|
sh, op_err);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* get the correct sctp_nets */
|
|
|
|
*netp = sctp_findnet(stcb, init_src);
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
/* get scope variables out of cookie */
|
|
|
|
asoc->ipv4_local_scope = cookie->ipv4_scope;
|
|
|
|
asoc->site_scope = cookie->site_scope;
|
|
|
|
asoc->local_scope = cookie->local_scope;
|
|
|
|
asoc->loopback_scope = cookie->loopback_scope;
|
|
|
|
|
|
|
|
if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
|
|
|
|
(asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
|
|
|
|
struct mbuf *op_err;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Houston we have a problem. The EP changed while the
|
|
|
|
* cookie was in flight. Only recourse is to abort the
|
|
|
|
* association.
|
|
|
|
*/
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
|
|
|
|
sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
|
|
|
|
sh, op_err);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* process the INIT-ACK info (my info) */
|
|
|
|
old_tag = asoc->my_vtag;
|
|
|
|
asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
|
|
|
|
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
|
|
|
|
asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
|
|
|
|
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
|
|
|
|
asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
|
|
|
|
asoc->last_cwr_tsn = asoc->init_seq_number - 1;
|
|
|
|
asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
|
|
|
|
asoc->str_reset_seq_in = asoc->init_seq_number;
|
|
|
|
|
|
|
|
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
|
|
|
|
|
|
|
|
/* process the INIT info (peer's info) */
|
|
|
|
retval = sctp_process_init(init_cp, stcb, *netp);
|
|
|
|
if (retval < 0) {
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* load all addresses */
|
|
|
|
if (sctp_load_addresses_from_init(stcb, m, iphlen,
|
|
|
|
init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
|
|
|
|
init_src)) {
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* verify any preceding AUTH chunk that was skipped
|
|
|
|
*/
|
|
|
|
/* pull the local authentication parameters from the cookie/init-ack */
|
|
|
|
sctp_auth_get_cookie_params(stcb, m,
|
|
|
|
initack_offset + sizeof(struct sctp_init_ack_chunk),
|
|
|
|
initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
|
|
|
|
if (auth_skipped) {
|
|
|
|
struct sctp_auth_chunk *auth;
|
|
|
|
|
|
|
|
auth = (struct sctp_auth_chunk *)
|
|
|
|
sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
|
|
|
|
if (sctp_handle_auth(stcb, auth, m, auth_offset)) {
|
|
|
|
/* auth HMAC failed, dump the assoc and packet */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_AUTH1)
|
|
|
|
printf("COOKIE-ECHO: AUTH failed\n");
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
return (NULL);
|
|
|
|
} else {
|
|
|
|
/* remaining chunks checked... good to go */
|
|
|
|
stcb->asoc.authenticated = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* update current state */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("moving to OPEN state\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
|
|
|
|
asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING;
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
|
|
|
|
stcb->sctp_ep, stcb, asoc->primary_destination);
|
|
|
|
} else {
|
|
|
|
asoc->state = SCTP_STATE_OPEN;
|
|
|
|
}
|
|
|
|
SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
|
|
|
|
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
/* calculate the RTT */
|
|
|
|
(*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
|
|
|
|
&cookie->time_entered);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* if we're doing ASCONFs, check to see if we have any new local
|
|
|
|
* addresses that need to get added to the peer (eg. addresses
|
|
|
|
* changed while cookie echo in flight). This needs to be done
|
|
|
|
* after we go to the OPEN state to do the correct asconf
|
|
|
|
* processing. else, make sure we have the correct addresses in our
|
|
|
|
* lists
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* warning, we re-use sin, sin6, sa_store here! */
|
|
|
|
/* pull in local_address (our "from" address) */
|
|
|
|
if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
|
|
|
|
/* source addr is IPv4 */
|
|
|
|
sin = (struct sockaddr_in *)initack_src;
|
|
|
|
memset(sin, 0, sizeof(*sin));
|
|
|
|
sin->sin_family = AF_INET;
|
|
|
|
sin->sin_len = sizeof(struct sockaddr_in);
|
|
|
|
sin->sin_addr.s_addr = cookie->laddress[0];
|
|
|
|
} else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
|
|
|
|
/* source addr is IPv6 */
|
|
|
|
sin6 = (struct sockaddr_in6 *)initack_src;
|
|
|
|
memset(sin6, 0, sizeof(*sin6));
|
|
|
|
sin6->sin6_family = AF_INET6;
|
|
|
|
sin6->sin6_len = sizeof(struct sockaddr_in6);
|
|
|
|
sin6->sin6_scope_id = cookie->scope_id;
|
|
|
|
memcpy(&sin6->sin6_addr, cookie->laddress,
|
|
|
|
sizeof(sin6->sin6_addr));
|
|
|
|
} else {
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
sctp_check_address_list(stcb, m,
|
|
|
|
initack_offset + sizeof(struct sctp_init_ack_chunk),
|
|
|
|
initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
|
|
|
|
initack_src, cookie->local_scope, cookie->site_scope,
|
|
|
|
cookie->ipv4_scope, cookie->loopback_scope);
|
|
|
|
|
|
|
|
|
|
|
|
/* set up to notify upper layer */
|
|
|
|
*notification = SCTP_NOTIFY_ASSOC_UP;
|
|
|
|
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
|
|
|
|
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
|
|
|
|
(inp->sctp_socket->so_qlimit == 0)) {
|
|
|
|
/*
|
|
|
|
* This is an endpoint that called connect() how it got a
|
|
|
|
* cookie that is NEW is a bit of a mystery. It must be that
|
|
|
|
* the INIT was sent, but before it got there.. a complete
|
|
|
|
* INIT/INIT-ACK/COOKIE arrived. But of course then it
|
|
|
|
* should have went to the other code.. not here.. oh well..
|
|
|
|
* a bit of protection is worth having..
|
|
|
|
*/
|
|
|
|
stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
|
|
|
|
soisconnected(stcb->sctp_ep->sctp_socket);
|
|
|
|
} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
|
|
|
|
(inp->sctp_socket->so_qlimit)) {
|
|
|
|
/*
|
|
|
|
* We don't want to do anything with this one. Since it is
|
|
|
|
* the listening guy. The timer will get started for
|
|
|
|
* accepted connections in the caller.
|
|
|
|
*/
|
|
|
|
;
|
|
|
|
}
|
|
|
|
/* since we did not send a HB make sure we don't double things */
|
|
|
|
(*netp)->hb_responded = 1;
|
|
|
|
|
|
|
|
if (stcb->asoc.sctp_autoclose_ticks &&
|
|
|
|
sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
|
|
|
|
}
|
|
|
|
/* respond with a COOKIE-ACK */
|
|
|
|
sctp_send_cookie_ack(stcb);
|
|
|
|
return (stcb);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* handles a COOKIE-ECHO message stcb: modified to either a new or left as
|
|
|
|
* existing (non-NULL) TCB
|
|
|
|
*/
|
|
|
|
static struct mbuf *
|
|
|
|
sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
|
|
|
|
struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
|
|
|
|
struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
|
|
|
|
int auth_skipped, uint32_t auth_offset, uint32_t auth_len)
|
|
|
|
{
|
|
|
|
struct sctp_state_cookie *cookie;
|
|
|
|
struct sockaddr_in6 sin6;
|
|
|
|
struct sockaddr_in sin;
|
|
|
|
struct sctp_tcb *l_stcb = *stcb;
|
|
|
|
struct sctp_inpcb *l_inp;
|
|
|
|
struct sockaddr *to;
|
|
|
|
sctp_assoc_t sac_restart_id;
|
|
|
|
struct sctp_pcb *ep;
|
|
|
|
struct mbuf *m_sig;
|
|
|
|
uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
|
|
|
|
uint8_t *sig;
|
|
|
|
uint8_t cookie_ok = 0;
|
|
|
|
unsigned int size_of_pkt, sig_offset, cookie_offset;
|
|
|
|
unsigned int cookie_len;
|
|
|
|
struct timeval now;
|
|
|
|
struct timeval time_expires;
|
|
|
|
struct sockaddr_storage dest_store;
|
|
|
|
struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
|
|
|
|
struct ip *iph;
|
|
|
|
int notification = 0;
|
|
|
|
struct sctp_nets *netl;
|
|
|
|
int had_a_existing_tcb = 0;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_cookie: handling COOKIE-ECHO\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (inp_p == NULL) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* First get the destination address setup too. */
|
|
|
|
iph = mtod(m, struct ip *);
|
|
|
|
if (iph->ip_v == IPVERSION) {
|
|
|
|
/* its IPv4 */
|
|
|
|
struct sockaddr_in *sin;
|
|
|
|
|
|
|
|
sin = (struct sockaddr_in *)(localep_sa);
|
|
|
|
memset(sin, 0, sizeof(*sin));
|
|
|
|
sin->sin_family = AF_INET;
|
|
|
|
sin->sin_len = sizeof(*sin);
|
|
|
|
sin->sin_port = sh->dest_port;
|
|
|
|
sin->sin_addr.s_addr = iph->ip_dst.s_addr;
|
|
|
|
} else if (iph->ip_v == (IPV6_VERSION >> 4)) {
|
|
|
|
/* its IPv6 */
|
|
|
|
struct ip6_hdr *ip6;
|
|
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
|
|
|
|
sin6 = (struct sockaddr_in6 *)(localep_sa);
|
|
|
|
memset(sin6, 0, sizeof(*sin6));
|
|
|
|
sin6->sin6_family = AF_INET6;
|
|
|
|
sin6->sin6_len = sizeof(struct sockaddr_in6);
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
sin6->sin6_port = sh->dest_port;
|
|
|
|
sin6->sin6_addr = ip6->ip6_dst;
|
|
|
|
} else {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
cookie = &cp->cookie;
|
|
|
|
cookie_offset = offset + sizeof(struct sctp_chunkhdr);
|
|
|
|
cookie_len = ntohs(cp->ch.chunk_length);
|
|
|
|
|
|
|
|
if ((cookie->peerport != sh->src_port) &&
|
|
|
|
(cookie->myport != sh->dest_port) &&
|
|
|
|
(cookie->my_vtag != sh->v_tag)) {
|
|
|
|
/*
|
|
|
|
* invalid ports or bad tag. Note that we always leave the
|
|
|
|
* v_tag in the header in network order and when we stored
|
|
|
|
* it in the my_vtag slot we also left it in network order.
|
|
|
|
* This maintians the match even though it may be in the
|
|
|
|
* opposite byte order of the machine :->
|
|
|
|
*/
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* compute size of packet */
|
|
|
|
if (m->m_flags & M_PKTHDR) {
|
|
|
|
size_of_pkt = m->m_pkthdr.len;
|
|
|
|
} else {
|
|
|
|
/* Should have a pkt hdr really */
|
|
|
|
struct mbuf *mat;
|
|
|
|
|
|
|
|
mat = m;
|
|
|
|
size_of_pkt = 0;
|
|
|
|
while (mat != NULL) {
|
|
|
|
size_of_pkt += mat->m_len;
|
|
|
|
mat = mat->m_next;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (cookie_len > size_of_pkt ||
|
|
|
|
cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
|
|
|
|
sizeof(struct sctp_init_chunk) +
|
|
|
|
sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
|
|
|
|
/* cookie too long! or too small */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* split off the signature into its own mbuf (since it should not be
|
|
|
|
* calculated in the sctp_hmac_m() call).
|
|
|
|
*/
|
|
|
|
sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
|
|
|
|
if (sig_offset > size_of_pkt) {
|
|
|
|
/* packet not correct size! */
|
|
|
|
/* XXX this may already be accounted for earlier... */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
m_sig = m_split(m, sig_offset, M_DONTWAIT);
|
|
|
|
if (m_sig == NULL) {
|
|
|
|
/* out of memory or ?? */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* compute the signature/digest for the cookie
|
|
|
|
*/
|
|
|
|
ep = &(*inp_p)->sctp_ep;
|
|
|
|
l_inp = *inp_p;
|
|
|
|
if (l_stcb) {
|
|
|
|
SCTP_TCB_UNLOCK(l_stcb);
|
|
|
|
}
|
|
|
|
SCTP_INP_RLOCK(l_inp);
|
|
|
|
if (l_stcb) {
|
|
|
|
SCTP_TCB_LOCK(l_stcb);
|
|
|
|
}
|
|
|
|
/* which cookie is it? */
|
|
|
|
if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
|
|
|
|
(ep->current_secret_number != ep->last_secret_number)) {
|
|
|
|
/* it's the old cookie */
|
|
|
|
sctp_hmac_m(SCTP_HMAC,
|
|
|
|
(uint8_t *) ep->secret_key[(int)ep->last_secret_number],
|
|
|
|
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig);
|
|
|
|
} else {
|
|
|
|
/* it's the current cookie */
|
|
|
|
sctp_hmac_m(SCTP_HMAC,
|
|
|
|
(uint8_t *) ep->secret_key[(int)ep->current_secret_number],
|
|
|
|
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig);
|
|
|
|
}
|
|
|
|
/* get the signature */
|
|
|
|
SCTP_INP_RUNLOCK(l_inp);
|
|
|
|
sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
|
|
|
|
if (sig == NULL) {
|
|
|
|
/* couldn't find signature */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* compare the received digest with the computed digest */
|
|
|
|
if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
|
|
|
|
/* try the old cookie? */
|
|
|
|
if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
|
|
|
|
(ep->current_secret_number != ep->last_secret_number)) {
|
|
|
|
/* compute digest with old */
|
|
|
|
sctp_hmac_m(SCTP_HMAC,
|
|
|
|
(uint8_t *) ep->secret_key[(int)ep->last_secret_number],
|
|
|
|
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig);
|
|
|
|
/* compare */
|
|
|
|
if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
|
|
|
|
cookie_ok = 1;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
cookie_ok = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now before we continue we must reconstruct our mbuf so that
|
|
|
|
* normal processing of any other chunks will work.
|
|
|
|
*/
|
|
|
|
{
|
|
|
|
struct mbuf *m_at;
|
|
|
|
|
|
|
|
m_at = m;
|
|
|
|
while (m_at->m_next != NULL) {
|
|
|
|
m_at = m_at->m_next;
|
|
|
|
}
|
|
|
|
m_at->m_next = m_sig;
|
|
|
|
if (m->m_flags & M_PKTHDR) {
|
|
|
|
/*
|
|
|
|
* We should only do this if and only if the front
|
|
|
|
* mbuf has a m_pkthdr... it should in theory.
|
|
|
|
*/
|
|
|
|
if (m_sig->m_flags & M_PKTHDR) {
|
|
|
|
/* Add back to the pkt hdr of main m chain */
|
|
|
|
m->m_pkthdr.len += m_sig->m_pkthdr.len;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Got a problem, no pkthdr in split chain.
|
|
|
|
* TSNH but we will handle it just in case
|
|
|
|
*/
|
|
|
|
int mmlen = 0;
|
|
|
|
struct mbuf *lat;
|
|
|
|
|
|
|
|
printf("Warning: Hitting m_split join TSNH code - fixed\n");
|
|
|
|
lat = m_sig;
|
|
|
|
while (lat) {
|
|
|
|
mmlen += lat->m_len;
|
|
|
|
lat = lat->m_next;
|
|
|
|
}
|
|
|
|
m->m_pkthdr.len += mmlen;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (cookie_ok == 0) {
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("handle_cookie_echo: cookie signature validation failed!\n");
|
|
|
|
printf("offset = %u, cookie_offset = %u, sig_offset = %u\n",
|
|
|
|
(uint32_t) offset, cookie_offset, sig_offset);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* check the cookie timestamps to be sure it's not stale
|
|
|
|
*/
|
|
|
|
SCTP_GETTIME_TIMEVAL(&now);
|
|
|
|
/* Expire time is in Ticks, so we convert to seconds */
|
|
|
|
time_expires.tv_sec = cookie->time_entered.tv_sec + cookie->cookie_life;
|
|
|
|
time_expires.tv_usec = cookie->time_entered.tv_usec;
|
|
|
|
if (timevalcmp(&now, &time_expires, >)) {
|
|
|
|
/* cookie is stale! */
|
|
|
|
struct mbuf *op_err;
|
|
|
|
struct sctp_stale_cookie_msg *scm;
|
|
|
|
uint32_t tim;
|
|
|
|
|
|
|
|
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
|
|
|
|
1, M_DONTWAIT, 1, MT_DATA);
|
|
|
|
if (op_err == NULL) {
|
|
|
|
/* FOOBAR */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* pre-reserve some space */
|
|
|
|
op_err->m_data += sizeof(struct ip6_hdr);
|
|
|
|
op_err->m_data += sizeof(struct sctphdr);
|
|
|
|
op_err->m_data += sizeof(struct sctp_chunkhdr);
|
|
|
|
|
|
|
|
/* Set the len */
|
|
|
|
op_err->m_len = op_err->m_pkthdr.len = sizeof(struct sctp_stale_cookie_msg);
|
|
|
|
scm = mtod(op_err, struct sctp_stale_cookie_msg *);
|
|
|
|
scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
|
|
|
|
scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
|
|
|
|
(sizeof(uint32_t))));
|
|
|
|
/* seconds to usec */
|
|
|
|
tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
|
|
|
|
/* add in usec */
|
|
|
|
if (tim == 0)
|
|
|
|
tim = now.tv_usec - cookie->time_entered.tv_usec;
|
|
|
|
scm->time_usec = htonl(tim);
|
|
|
|
sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Now we must see with the lookup address if we have an existing
|
|
|
|
* asoc. This will only happen if we were in the COOKIE-WAIT state
|
|
|
|
* and a INIT collided with us and somewhere the peer sent the
|
|
|
|
* cookie on another address besides the single address our assoc
|
|
|
|
* had for him. In this case we will have one of the tie-tags set at
|
|
|
|
* least AND the address field in the cookie can be used to look it
|
|
|
|
* up.
|
|
|
|
*/
|
|
|
|
to = NULL;
|
|
|
|
if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
|
|
sin6.sin6_family = AF_INET6;
|
|
|
|
sin6.sin6_len = sizeof(sin6);
|
|
|
|
sin6.sin6_port = sh->src_port;
|
|
|
|
sin6.sin6_scope_id = cookie->scope_id;
|
|
|
|
memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
|
|
|
|
sizeof(sin6.sin6_addr.s6_addr));
|
|
|
|
to = (struct sockaddr *)&sin6;
|
|
|
|
} else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
|
|
|
|
memset(&sin, 0, sizeof(sin));
|
|
|
|
sin.sin_family = AF_INET;
|
|
|
|
sin.sin_len = sizeof(sin);
|
|
|
|
sin.sin_port = sh->src_port;
|
|
|
|
sin.sin_addr.s_addr = cookie->address[0];
|
|
|
|
to = (struct sockaddr *)&sin;
|
|
|
|
}
|
|
|
|
if ((*stcb == NULL) && to) {
|
|
|
|
/* Yep, lets check */
|
|
|
|
*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
|
|
|
|
if (*stcb == NULL) {
|
|
|
|
/*
|
|
|
|
* We should have only got back the same inp. If we
|
|
|
|
* got back a different ep we have a problem. The
|
|
|
|
* original findep got back l_inp and now
|
|
|
|
*/
|
|
|
|
if (l_inp != *inp_p) {
|
|
|
|
printf("Bad problem find_ep got a diff inp then special_locate?\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
cookie_len -= SCTP_SIGNATURE_SIZE;
|
|
|
|
if (*stcb == NULL) {
|
|
|
|
/* this is the "normal" case... get a new TCB */
|
|
|
|
*stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
|
|
|
|
cookie_len, *inp_p, netp, to, ¬ification,
|
|
|
|
auth_skipped, auth_offset, auth_len);
|
|
|
|
} else {
|
|
|
|
/* this is abnormal... cookie-echo on existing TCB */
|
|
|
|
had_a_existing_tcb = 1;
|
|
|
|
*stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
|
|
|
|
cookie, cookie_len, *inp_p, *stcb, *netp, to, ¬ification,
|
|
|
|
&sac_restart_id);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (*stcb == NULL) {
|
|
|
|
/* still no TCB... must be bad cookie-echo */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Ok, we built an association so confirm the address we sent the
|
|
|
|
* INIT-ACK to.
|
|
|
|
*/
|
|
|
|
netl = sctp_findnet(*stcb, to);
|
|
|
|
/*
|
|
|
|
* This code should in theory NOT run but
|
|
|
|
*/
|
|
|
|
if (netl == NULL) {
|
|
|
|
/* TSNH! Huh, why do I need to add this address here? */
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = sctp_add_remote_addr(*stcb, to, 0, 100);
|
|
|
|
netl = sctp_findnet(*stcb, to);
|
|
|
|
}
|
|
|
|
if (netl) {
|
|
|
|
if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
|
|
|
|
netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
|
|
|
|
sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
|
|
|
|
netl);
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
|
|
|
|
(*stcb), 0, (void *)netl);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (*stcb) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
|
|
|
|
*stcb, NULL);
|
|
|
|
}
|
|
|
|
if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
|
|
|
|
if (!had_a_existing_tcb ||
|
|
|
|
(((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
|
|
|
|
/*
|
|
|
|
* If we have a NEW cookie or the connect never
|
|
|
|
* reached the connected state during collision we
|
|
|
|
* must do the TCP accept thing.
|
|
|
|
*/
|
|
|
|
struct socket *so, *oso;
|
|
|
|
struct sctp_inpcb *inp;
|
|
|
|
|
|
|
|
if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
|
|
|
|
/*
|
|
|
|
* For a restart we will keep the same
|
|
|
|
* socket, no need to do anything. I THINK!!
|
|
|
|
*/
|
|
|
|
sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id);
|
|
|
|
return (m);
|
|
|
|
}
|
|
|
|
oso = (*inp_p)->sctp_socket;
|
|
|
|
/*
|
|
|
|
* We do this to keep the sockets side happy durin
|
|
|
|
* the sonewcon ONLY.
|
|
|
|
*/
|
|
|
|
NET_LOCK_GIANT();
|
|
|
|
SCTP_TCB_UNLOCK((*stcb));
|
|
|
|
so = sonewconn(oso, SS_ISCONNECTED
|
|
|
|
);
|
|
|
|
NET_UNLOCK_GIANT();
|
|
|
|
SCTP_INP_WLOCK((*stcb)->sctp_ep);
|
|
|
|
SCTP_TCB_LOCK((*stcb));
|
|
|
|
SCTP_INP_WUNLOCK((*stcb)->sctp_ep);
|
|
|
|
if (so == NULL) {
|
|
|
|
struct mbuf *op_err;
|
|
|
|
|
|
|
|
/* Too many sockets */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("process_cookie_new: no room for another socket!\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
|
|
|
|
sctp_abort_association(*inp_p, NULL, m, iphlen,
|
|
|
|
sh, op_err);
|
|
|
|
sctp_free_assoc(*inp_p, *stcb, 0);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
inp = (struct sctp_inpcb *)so->so_pcb;
|
|
|
|
inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
|
|
|
|
SCTP_PCB_FLAGS_CONNECTED |
|
|
|
|
SCTP_PCB_FLAGS_IN_TCPPOOL |
|
|
|
|
(SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
|
|
|
|
SCTP_PCB_FLAGS_DONT_WAKE);
|
|
|
|
inp->sctp_features = (*inp_p)->sctp_features;
|
|
|
|
inp->sctp_socket = so;
|
|
|
|
inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
|
|
|
|
inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
|
|
|
|
inp->sctp_context = (*inp_p)->sctp_context;
|
|
|
|
inp->inp_starting_point_for_iterator = NULL;
|
|
|
|
/*
|
|
|
|
* copy in the authentication parameters from the
|
|
|
|
* original endpoint
|
|
|
|
*/
|
|
|
|
if (inp->sctp_ep.local_hmacs)
|
|
|
|
sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
|
|
|
|
inp->sctp_ep.local_hmacs =
|
|
|
|
sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
|
|
|
|
if (inp->sctp_ep.local_auth_chunks)
|
|
|
|
sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
|
|
|
|
inp->sctp_ep.local_auth_chunks =
|
|
|
|
sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
|
|
|
|
(void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys,
|
|
|
|
&inp->sctp_ep.shared_keys);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now we must move it from one hash table to
|
|
|
|
* another and get the tcb in the right place.
|
|
|
|
*/
|
|
|
|
sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
|
|
|
|
|
|
|
|
sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb);
|
|
|
|
|
|
|
|
/* Switch over to the new guy */
|
|
|
|
*inp_p = inp;
|
|
|
|
|
|
|
|
sctp_ulp_notify(notification, *stcb, 0, NULL);
|
|
|
|
return (m);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
|
|
|
|
sctp_ulp_notify(notification, *stcb, 0, NULL);
|
|
|
|
}
|
|
|
|
return (m);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
/* cp must not be used, others call this without a c-ack :-) */
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_cookie_ack: handling COOKIE-ACK\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (stcb == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
/* process according to association state */
|
|
|
|
if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
|
|
|
|
/* state change only needed when I am in right state */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("moving to OPEN state\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
|
|
|
|
asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING;
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
|
|
|
|
stcb->sctp_ep, stcb, asoc->primary_destination);
|
|
|
|
|
|
|
|
} else {
|
|
|
|
asoc->state = SCTP_STATE_OPEN;
|
|
|
|
}
|
|
|
|
/* update RTO */
|
|
|
|
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
|
|
|
|
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
|
|
|
|
if (asoc->overall_error_count == 0) {
|
|
|
|
net->RTO = sctp_calculate_rto(stcb, asoc, net,
|
|
|
|
&asoc->time_entered);
|
|
|
|
}
|
|
|
|
SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL);
|
|
|
|
if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
|
|
|
|
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
|
|
|
|
stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
|
|
|
|
soisconnected(stcb->sctp_ep->sctp_socket);
|
|
|
|
}
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
|
|
|
|
stcb, net);
|
|
|
|
/*
|
|
|
|
* since we did not send a HB make sure we don't double
|
|
|
|
* things
|
|
|
|
*/
|
|
|
|
net->hb_responded = 1;
|
|
|
|
|
|
|
|
if (stcb->asoc.sctp_autoclose_ticks &&
|
|
|
|
sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
|
|
|
|
stcb->sctp_ep, stcb, NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* set ASCONF timer if ASCONFs are pending and allowed (eg.
|
|
|
|
* addresses changed when init/cookie echo in flight)
|
|
|
|
*/
|
|
|
|
if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
|
|
|
|
(stcb->asoc.peer_supports_asconf) &&
|
|
|
|
(!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
|
|
|
|
stcb->sctp_ep, stcb,
|
|
|
|
stcb->asoc.primary_destination);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Toss the cookie if I can */
|
|
|
|
sctp_toss_old_cookies(stcb, asoc);
|
|
|
|
if (!TAILQ_EMPTY(&asoc->sent_queue)) {
|
|
|
|
/* Restart the timer if we have pending data */
|
|
|
|
struct sctp_tmit_chunk *chk;
|
|
|
|
|
|
|
|
chk = TAILQ_FIRST(&asoc->sent_queue);
|
|
|
|
if (chk) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
|
|
|
|
stcb, chk->whoTo);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb)
|
|
|
|
{
|
|
|
|
struct sctp_nets *net;
|
|
|
|
struct sctp_tmit_chunk *lchk;
|
|
|
|
uint32_t tsn;
|
|
|
|
|
|
|
|
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
SCTP_STAT_INCR(sctps_recvecne);
|
|
|
|
tsn = ntohl(cp->tsn);
|
|
|
|
/* ECN Nonce stuff: need a resync and disable the nonce sum check */
|
|
|
|
/* Also we make sure we disable the nonce_wait */
|
|
|
|
lchk = TAILQ_FIRST(&stcb->asoc.send_queue);
|
|
|
|
if (lchk == NULL) {
|
|
|
|
stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq;
|
|
|
|
} else {
|
|
|
|
stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq;
|
|
|
|
}
|
|
|
|
stcb->asoc.nonce_wait_for_ecne = 0;
|
|
|
|
stcb->asoc.nonce_sum_check = 0;
|
|
|
|
|
|
|
|
/* Find where it was sent, if possible */
|
|
|
|
net = NULL;
|
|
|
|
lchk = TAILQ_FIRST(&stcb->asoc.sent_queue);
|
|
|
|
while (lchk) {
|
|
|
|
if (lchk->rec.data.TSN_seq == tsn) {
|
|
|
|
net = lchk->whoTo;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ))
|
|
|
|
break;
|
|
|
|
lchk = TAILQ_NEXT(lchk, sctp_next);
|
|
|
|
}
|
|
|
|
if (net == NULL)
|
|
|
|
/* default is we use the primary */
|
|
|
|
net = stcb->asoc.primary_destination;
|
|
|
|
|
|
|
|
if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) {
|
|
|
|
#ifdef SCTP_CWND_MONITOR
|
|
|
|
int old_cwnd;
|
|
|
|
|
|
|
|
old_cwnd = net->cwnd;
|
|
|
|
#endif
|
|
|
|
SCTP_STAT_INCR(sctps_ecnereducedcwnd);
|
|
|
|
net->ssthresh = net->cwnd / 2;
|
|
|
|
if (net->ssthresh < net->mtu) {
|
|
|
|
net->ssthresh = net->mtu;
|
|
|
|
/* here back off the timer as well, to slow us down */
|
|
|
|
net->RTO <<= 2;
|
|
|
|
}
|
|
|
|
net->cwnd = net->ssthresh;
|
|
|
|
#ifdef SCTP_CWND_MONITOR
|
|
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
|
|
|
|
#endif
|
|
|
|
/*
|
|
|
|
* we reduce once every RTT. So we will only lower cwnd at
|
|
|
|
* the next sending seq i.e. the resync_tsn.
|
|
|
|
*/
|
|
|
|
stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* We always send a CWR this way if our previous one was lost our
|
|
|
|
* peer will get an update, or if it is not time again to reduce we
|
|
|
|
* still get the cwr to the peer.
|
|
|
|
*/
|
|
|
|
sctp_send_cwr(stcb, net, tsn);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Here we get a CWR from the peer. We must look in the outqueue and
|
|
|
|
* make sure that we have a covered ECNE in teh control chunk part.
|
|
|
|
* If so remove it.
|
|
|
|
*/
|
|
|
|
struct sctp_tmit_chunk *chk;
|
|
|
|
struct sctp_ecne_chunk *ecne;
|
|
|
|
|
|
|
|
TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
|
|
|
|
if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Look for and remove if it is the right TSN. Since there
|
|
|
|
* is only ONE ECNE on the control queue at any one time we
|
|
|
|
* don't need to worry about more than one!
|
|
|
|
*/
|
|
|
|
ecne = mtod(chk->data, struct sctp_ecne_chunk *);
|
|
|
|
if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn),
|
|
|
|
MAX_TSN) || (cp->tsn == ecne->tsn)) {
|
|
|
|
/* this covers this ECNE, we can remove it */
|
|
|
|
stcb->asoc.ecn_echo_cnt_onq--;
|
|
|
|
TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
|
|
|
|
sctp_next);
|
|
|
|
if (chk->data) {
|
|
|
|
sctp_m_freem(chk->data);
|
|
|
|
chk->data = NULL;
|
|
|
|
}
|
|
|
|
stcb->asoc.ctrl_queue_cnt--;
|
|
|
|
sctp_free_remote_addr(chk->whoTo);
|
|
|
|
sctp_free_a_chunk(stcb, chk);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (stcb == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
/* process according to association state */
|
|
|
|
if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
|
|
|
|
/* unexpected SHUTDOWN-COMPLETE... so ignore... */
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* notify upper layer protocol */
|
|
|
|
if (stcb->sctp_socket) {
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL);
|
|
|
|
/* are the queues empty? they should be */
|
|
|
|
if (!TAILQ_EMPTY(&asoc->send_queue) ||
|
|
|
|
!TAILQ_EMPTY(&asoc->sent_queue) ||
|
|
|
|
!TAILQ_EMPTY(&asoc->out_wheel)) {
|
|
|
|
sctp_report_all_outbound(stcb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* stop the timer */
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net);
|
|
|
|
SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
|
|
|
|
/* free the TCB */
|
|
|
|
sctp_free_assoc(stcb->sctp_ep, stcb, 0);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
|
|
|
|
struct sctp_nets *net, uint8_t flg)
|
|
|
|
{
|
|
|
|
switch (desc->chunk_type) {
|
|
|
|
case SCTP_DATA:
|
|
|
|
/* find the tsn to resend (possibly */
|
|
|
|
{
|
|
|
|
uint32_t tsn;
|
|
|
|
struct sctp_tmit_chunk *tp1;
|
|
|
|
|
|
|
|
tsn = ntohl(desc->tsn_ifany);
|
|
|
|
tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
|
|
|
|
while (tp1) {
|
|
|
|
if (tp1->rec.data.TSN_seq == tsn) {
|
|
|
|
/* found it */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn,
|
|
|
|
MAX_TSN)) {
|
|
|
|
/* not found */
|
|
|
|
tp1 = NULL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
tp1 = TAILQ_NEXT(tp1, sctp_next);
|
|
|
|
}
|
|
|
|
if (tp1 == NULL) {
|
|
|
|
/*
|
|
|
|
* Do it the other way , aka without paying
|
|
|
|
* attention to queue seq order.
|
|
|
|
*/
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpdnfnd);
|
|
|
|
tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
|
|
|
|
while (tp1) {
|
|
|
|
if (tp1->rec.data.TSN_seq == tsn) {
|
|
|
|
/* found it */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
tp1 = TAILQ_NEXT(tp1, sctp_next);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (tp1 == NULL) {
|
|
|
|
SCTP_STAT_INCR(sctps_pdrptsnnf);
|
|
|
|
}
|
|
|
|
if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
|
|
|
|
uint8_t *ddp;
|
|
|
|
|
|
|
|
if ((stcb->asoc.peers_rwnd == 0) &&
|
|
|
|
((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpdiwnp);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
if (stcb->asoc.peers_rwnd == 0 &&
|
|
|
|
(flg & SCTP_FROM_MIDDLE_BOX)) {
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpdizrw);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
|
|
|
|
sizeof(struct sctp_data_chunk));
|
|
|
|
{
|
|
|
|
unsigned int iii;
|
|
|
|
|
|
|
|
for (iii = 0; iii < sizeof(desc->data_bytes);
|
|
|
|
iii++) {
|
|
|
|
if (ddp[iii] != desc->data_bytes[iii]) {
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpbadd);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* We zero out the nonce so resync not
|
|
|
|
* needed
|
|
|
|
*/
|
|
|
|
tp1->rec.data.ect_nonce = 0;
|
|
|
|
|
|
|
|
if (tp1->do_rtt) {
|
|
|
|
/*
|
|
|
|
* this guy had a RTO calculation
|
|
|
|
* pending on it, cancel it
|
|
|
|
*/
|
|
|
|
tp1->whoTo->rto_pending = 0;
|
|
|
|
tp1->do_rtt = 0;
|
|
|
|
}
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpmark);
|
|
|
|
if (tp1->sent != SCTP_DATAGRAM_RESEND)
|
|
|
|
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
|
|
|
|
tp1->sent = SCTP_DATAGRAM_RESEND;
|
|
|
|
/*
|
|
|
|
* mark it as if we were doing a FR, since
|
|
|
|
* we will be getting gap ack reports behind
|
|
|
|
* the info from the router.
|
|
|
|
*/
|
|
|
|
tp1->rec.data.doing_fast_retransmit = 1;
|
|
|
|
/*
|
|
|
|
* mark the tsn with what sequences can
|
|
|
|
* cause a new FR.
|
|
|
|
*/
|
|
|
|
if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
|
|
|
|
tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
|
|
|
|
} else {
|
|
|
|
tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* restart the timer */
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
|
|
|
|
stcb, tp1->whoTo);
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
|
|
|
|
stcb, tp1->whoTo);
|
|
|
|
|
|
|
|
/* fix counts and things */
|
|
|
|
if (tp1->whoTo->flight_size >= tp1->book_size)
|
|
|
|
tp1->whoTo->flight_size -= tp1->book_size;
|
|
|
|
else
|
|
|
|
tp1->whoTo->flight_size = 0;
|
|
|
|
|
|
|
|
if (stcb->asoc.total_flight >= tp1->book_size) {
|
|
|
|
stcb->asoc.total_flight -= tp1->book_size;
|
|
|
|
if (stcb->asoc.total_flight_count > 0)
|
|
|
|
stcb->asoc.total_flight_count--;
|
|
|
|
} else {
|
|
|
|
stcb->asoc.total_flight = 0;
|
|
|
|
stcb->asoc.total_flight_count = 0;
|
|
|
|
}
|
|
|
|
tp1->snd_count--;
|
|
|
|
} {
|
|
|
|
/* audit code */
|
|
|
|
unsigned int audit;
|
|
|
|
|
|
|
|
audit = 0;
|
|
|
|
TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
|
|
|
|
if (tp1->sent == SCTP_DATAGRAM_RESEND)
|
|
|
|
audit++;
|
|
|
|
}
|
|
|
|
TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
|
|
|
|
sctp_next) {
|
|
|
|
if (tp1->sent == SCTP_DATAGRAM_RESEND)
|
|
|
|
audit++;
|
|
|
|
}
|
|
|
|
if (audit != stcb->asoc.sent_queue_retran_cnt) {
|
|
|
|
printf("**Local Audit finds cnt:%d asoc cnt:%d\n",
|
|
|
|
audit, stcb->asoc.sent_queue_retran_cnt);
|
|
|
|
#ifndef SCTP_AUDITING_ENABLED
|
|
|
|
stcb->asoc.sent_queue_retran_cnt = audit;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_ASCONF:
|
|
|
|
{
|
|
|
|
struct sctp_tmit_chunk *asconf;
|
|
|
|
|
|
|
|
TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
|
|
|
|
sctp_next) {
|
|
|
|
if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (asconf) {
|
|
|
|
if (asconf->sent != SCTP_DATAGRAM_RESEND)
|
|
|
|
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
|
|
|
|
asconf->sent = SCTP_DATAGRAM_RESEND;
|
|
|
|
asconf->snd_count--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_INITIATION:
|
|
|
|
/* resend the INIT */
|
|
|
|
stcb->asoc.dropped_special_cnt++;
|
|
|
|
if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
|
|
|
|
/*
|
|
|
|
* If we can get it in, in a few attempts we do
|
|
|
|
* this, otherwise we let the timer fire.
|
|
|
|
*/
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
|
|
|
|
stcb, net);
|
|
|
|
sctp_send_initiate(stcb->sctp_ep, stcb);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_SELECTIVE_ACK:
|
|
|
|
/* resend the sack */
|
|
|
|
sctp_send_sack(stcb);
|
|
|
|
break;
|
|
|
|
case SCTP_HEARTBEAT_REQUEST:
|
|
|
|
/* resend a demand HB */
|
|
|
|
sctp_send_hb(stcb, 1, net);
|
|
|
|
break;
|
|
|
|
case SCTP_SHUTDOWN:
|
|
|
|
sctp_send_shutdown(stcb, net);
|
|
|
|
break;
|
|
|
|
case SCTP_SHUTDOWN_ACK:
|
|
|
|
sctp_send_shutdown_ack(stcb, net);
|
|
|
|
break;
|
|
|
|
case SCTP_COOKIE_ECHO:
|
|
|
|
{
|
|
|
|
struct sctp_tmit_chunk *cookie;
|
|
|
|
|
|
|
|
cookie = NULL;
|
|
|
|
TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
|
|
|
|
sctp_next) {
|
|
|
|
if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (cookie) {
|
|
|
|
if (cookie->sent != SCTP_DATAGRAM_RESEND)
|
|
|
|
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
|
|
|
|
cookie->sent = SCTP_DATAGRAM_RESEND;
|
|
|
|
sctp_stop_all_cookie_timers(stcb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_COOKIE_ACK:
|
|
|
|
sctp_send_cookie_ack(stcb);
|
|
|
|
break;
|
|
|
|
case SCTP_ASCONF_ACK:
|
|
|
|
/* resend last asconf ack */
|
|
|
|
sctp_send_asconf_ack(stcb, 1);
|
|
|
|
break;
|
|
|
|
case SCTP_FORWARD_CUM_TSN:
|
|
|
|
send_forward_tsn(stcb, &stcb->asoc);
|
|
|
|
break;
|
|
|
|
/* can't do anything with these */
|
|
|
|
case SCTP_PACKET_DROPPED:
|
|
|
|
case SCTP_INITIATION_ACK: /* this should not happen */
|
|
|
|
case SCTP_HEARTBEAT_ACK:
|
|
|
|
case SCTP_ABORT_ASSOCIATION:
|
|
|
|
case SCTP_OPERATION_ERROR:
|
|
|
|
case SCTP_SHUTDOWN_COMPLETE:
|
|
|
|
case SCTP_ECN_ECHO:
|
|
|
|
case SCTP_ECN_CWR:
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
uint16_t temp;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We set things to 0xffff since this is the last delivered sequence
|
|
|
|
* and we will be sending in 0 after the reset.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (number_entries) {
|
|
|
|
for (i = 0; i < number_entries; i++) {
|
|
|
|
temp = ntohs(list[i]);
|
|
|
|
if (temp >= stcb->asoc.streamincnt) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
list = NULL;
|
|
|
|
for (i = 0; i < stcb->asoc.streamincnt; i++) {
|
|
|
|
stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (number_entries == 0) {
|
|
|
|
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
|
|
|
|
stcb->asoc.strmout[i].next_sequence_sent = 0;
|
|
|
|
}
|
|
|
|
} else if (number_entries) {
|
|
|
|
for (i = 0; i < number_entries; i++) {
|
|
|
|
uint16_t temp;
|
|
|
|
|
|
|
|
temp = ntohs(list[i]);
|
|
|
|
if (temp >= stcb->asoc.streamoutcnt) {
|
|
|
|
/* no such stream */
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
stcb->asoc.strmout[temp].next_sequence_sent = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
struct sctp_stream_reset_out_request *
|
|
|
|
sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
struct sctp_stream_reset_out_req *req;
|
|
|
|
struct sctp_stream_reset_out_request *r;
|
|
|
|
struct sctp_tmit_chunk *chk;
|
|
|
|
int len, clen;
|
|
|
|
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (stcb->asoc.str_reset == NULL) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
chk = stcb->asoc.str_reset;
|
|
|
|
if (chk->data == NULL) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (bchk) {
|
|
|
|
/* he wants a copy of the chk pointer */
|
|
|
|
*bchk = chk;
|
|
|
|
}
|
|
|
|
clen = chk->send_size;
|
|
|
|
req = mtod(chk->data, struct sctp_stream_reset_out_req *);
|
|
|
|
r = &req->sr_req;
|
|
|
|
if (ntohl(r->request_seq) == seq) {
|
|
|
|
/* found it */
|
|
|
|
return (r);
|
|
|
|
}
|
|
|
|
len = SCTP_SIZE32(ntohs(r->ph.param_length));
|
|
|
|
if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
|
|
|
|
/* move to the next one, there can only be a max of two */
|
|
|
|
r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
|
|
|
|
if (ntohl(r->request_seq) == seq) {
|
|
|
|
return (r);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* that seq is not here */
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
|
|
|
|
|
|
|
|
if (stcb->asoc.str_reset == NULL) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
|
|
|
|
TAILQ_REMOVE(&asoc->control_send_queue,
|
|
|
|
chk,
|
|
|
|
sctp_next);
|
|
|
|
if (chk->data) {
|
|
|
|
sctp_m_freem(chk->data);
|
|
|
|
chk->data = NULL;
|
|
|
|
}
|
|
|
|
asoc->ctrl_queue_cnt--;
|
|
|
|
sctp_free_remote_addr(chk->whoTo);
|
|
|
|
|
|
|
|
sctp_free_a_chunk(stcb, chk);
|
|
|
|
stcb->asoc.str_reset = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
|
|
|
|
uint32_t seq, uint32_t action,
|
|
|
|
struct sctp_stream_reset_response *respin
|
|
|
|
)
|
|
|
|
{
|
|
|
|
uint16_t type;
|
|
|
|
int lparm_len;
|
|
|
|
struct sctp_association *asoc = &stcb->asoc;
|
|
|
|
struct sctp_tmit_chunk *chk;
|
|
|
|
struct sctp_stream_reset_out_request *srparam;
|
|
|
|
int number_entries;
|
|
|
|
|
|
|
|
if (asoc->stream_reset_outstanding == 0) {
|
|
|
|
/* duplicate */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
if (seq == stcb->asoc.str_reset_seq_out) {
|
|
|
|
srparam = sctp_find_stream_reset(stcb, seq, &chk);
|
|
|
|
if (srparam) {
|
|
|
|
stcb->asoc.str_reset_seq_out++;
|
|
|
|
type = ntohs(srparam->ph.param_type);
|
|
|
|
lparm_len = ntohs(srparam->ph.param_length);
|
|
|
|
number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
|
|
|
|
if (type == SCTP_STR_RESET_OUT_REQUEST) {
|
|
|
|
asoc->stream_reset_out_is_outstanding = 0;
|
|
|
|
if (asoc->stream_reset_outstanding)
|
|
|
|
asoc->stream_reset_outstanding--;
|
|
|
|
if (action == SCTP_STREAM_RESET_PERFORMED) {
|
|
|
|
/* do it */
|
|
|
|
sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
|
|
|
|
} else {
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams);
|
|
|
|
}
|
|
|
|
} else if (type == SCTP_STR_RESET_IN_REQUEST) {
|
|
|
|
/* Answered my request */
|
|
|
|
if (asoc->stream_reset_outstanding)
|
|
|
|
asoc->stream_reset_outstanding--;
|
|
|
|
if (action != SCTP_STREAM_RESET_PERFORMED) {
|
|
|
|
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams);
|
|
|
|
}
|
|
|
|
} else if (type == SCTP_STR_RESET_TSN_REQUEST) {
|
|
|
|
/**
|
|
|
|
* a) Adopt the new in tsn.
|
|
|
|
* b) reset the map
|
|
|
|
* c) Adopt the new out-tsn
|
|
|
|
*/
|
|
|
|
struct sctp_stream_reset_response_tsn *resp;
|
|
|
|
struct sctp_forward_tsn_chunk fwdtsn;
|
|
|
|
int abort_flag = 0;
|
|
|
|
|
|
|
|
if (respin == NULL) {
|
|
|
|
/* huh ? */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
if (action == SCTP_STREAM_RESET_PERFORMED) {
|
|
|
|
resp = (struct sctp_stream_reset_response_tsn *)respin;
|
|
|
|
asoc->stream_reset_outstanding--;
|
|
|
|
fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
|
|
|
|
fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
|
|
|
|
fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
|
|
|
|
sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag);
|
|
|
|
if (abort_flag) {
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
|
|
|
|
stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
|
|
|
|
stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
|
|
|
|
memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
|
|
|
|
stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
|
|
|
|
stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
|
|
|
|
|
|
|
|
sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
|
|
|
|
sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* get rid of the request and get the request flags */
|
|
|
|
if (asoc->stream_reset_outstanding == 0) {
|
|
|
|
sctp_clean_up_stream_reset(stcb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
|
|
|
|
struct sctp_tmit_chunk *chk,
|
|
|
|
struct sctp_stream_reset_in_request *req)
|
|
|
|
{
|
|
|
|
uint32_t seq;
|
|
|
|
int len, i;
|
|
|
|
int number_entries;
|
|
|
|
uint16_t temp;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* peer wants me to send a str-reset to him for my outgoing seq's if
|
|
|
|
* seq_in is right.
|
|
|
|
*/
|
|
|
|
struct sctp_association *asoc = &stcb->asoc;
|
|
|
|
|
|
|
|
seq = ntohl(req->request_seq);
|
|
|
|
if (asoc->str_reset_seq_in == seq) {
|
|
|
|
if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
|
|
|
|
len = ntohs(req->ph.param_length);
|
|
|
|
number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
|
|
|
|
for (i = 0; i < number_entries; i++) {
|
|
|
|
temp = ntohs(req->list_of_streams[i]);
|
|
|
|
req->list_of_streams[i] = temp;
|
|
|
|
}
|
|
|
|
/* move the reset action back one */
|
|
|
|
asoc->last_reset_action[1] = asoc->last_reset_action[0];
|
|
|
|
asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
|
|
|
|
sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
|
|
|
|
asoc->str_reset_seq_out,
|
|
|
|
seq, (asoc->sending_seq - 1));
|
|
|
|
asoc->stream_reset_out_is_outstanding = 1;
|
|
|
|
asoc->str_reset = chk;
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
|
|
|
|
stcb->asoc.stream_reset_outstanding++;
|
|
|
|
} else {
|
|
|
|
/* Can't do it, since we have sent one out */
|
|
|
|
asoc->last_reset_action[1] = asoc->last_reset_action[0];
|
|
|
|
asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
|
|
|
|
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
|
|
|
|
}
|
|
|
|
asoc->str_reset_seq_in++;
|
|
|
|
} else if (asoc->str_reset_seq_in - 1 == seq) {
|
|
|
|
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
|
|
|
|
} else if (asoc->str_reset_seq_in - 2 == seq) {
|
|
|
|
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
|
|
|
|
} else {
|
|
|
|
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
|
|
|
|
struct sctp_tmit_chunk *chk,
|
|
|
|
struct sctp_stream_reset_tsn_request *req)
|
|
|
|
{
|
|
|
|
/* reset all in and out and update the tsn */
|
|
|
|
/*
|
|
|
|
* A) reset my str-seq's on in and out. B) Select a receive next,
|
|
|
|
* and set cum-ack to it. Also process this selected number as a
|
|
|
|
* fwd-tsn as well. C) set in the response my next sending seq.
|
|
|
|
*/
|
|
|
|
struct sctp_forward_tsn_chunk fwdtsn;
|
|
|
|
struct sctp_association *asoc = &stcb->asoc;
|
|
|
|
int abort_flag = 0;
|
|
|
|
uint32_t seq;
|
|
|
|
|
|
|
|
seq = ntohl(req->request_seq);
|
|
|
|
if (asoc->str_reset_seq_in == seq) {
|
|
|
|
fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
|
|
|
|
fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
|
|
|
|
fwdtsn.ch.chunk_flags = 0;
|
|
|
|
fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
|
|
|
|
sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag);
|
|
|
|
if (abort_flag) {
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
|
|
|
|
stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
|
|
|
|
stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
|
|
|
|
memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
|
|
|
|
atomic_add_int(&stcb->asoc.sending_seq, 1);
|
|
|
|
/* save off historical data for retrans */
|
|
|
|
stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
|
|
|
|
stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
|
|
|
|
stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
|
|
|
|
stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
|
|
|
|
|
|
|
|
sctp_add_stream_reset_result_tsn(chk,
|
|
|
|
ntohl(req->request_seq),
|
|
|
|
SCTP_STREAM_RESET_PERFORMED,
|
|
|
|
stcb->asoc.sending_seq,
|
|
|
|
stcb->asoc.mapping_array_base_tsn);
|
|
|
|
sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
|
|
|
|
sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
|
|
|
|
stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
|
|
|
|
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
|
|
|
|
|
|
|
|
asoc->str_reset_seq_in++;
|
|
|
|
} else if (asoc->str_reset_seq_in - 1 == seq) {
|
|
|
|
sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
|
|
|
|
stcb->asoc.last_sending_seq[0],
|
|
|
|
stcb->asoc.last_base_tsnsent[0]
|
|
|
|
);
|
|
|
|
} else if (asoc->str_reset_seq_in - 2 == seq) {
|
|
|
|
sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
|
|
|
|
stcb->asoc.last_sending_seq[1],
|
|
|
|
stcb->asoc.last_base_tsnsent[1]
|
|
|
|
);
|
|
|
|
} else {
|
|
|
|
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
|
|
|
|
struct sctp_tmit_chunk *chk,
|
|
|
|
struct sctp_stream_reset_out_request *req)
|
|
|
|
{
|
|
|
|
uint32_t seq, tsn;
|
|
|
|
int number_entries, len;
|
|
|
|
struct sctp_association *asoc = &stcb->asoc;
|
|
|
|
|
|
|
|
seq = ntohl(req->request_seq);
|
|
|
|
|
|
|
|
/* now if its not a duplicate we process it */
|
|
|
|
if (asoc->str_reset_seq_in == seq) {
|
|
|
|
len = ntohs(req->ph.param_length);
|
|
|
|
number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
|
|
|
|
/*
|
|
|
|
* the sender is resetting, handle the list issue.. we must
|
|
|
|
* a) verify if we can do the reset, if so no problem b) If
|
|
|
|
* we can't do the reset we must copy the request. c) queue
|
|
|
|
* it, and setup the data in processor to trigger it off
|
|
|
|
* when needed and dequeue all the queued data.
|
|
|
|
*/
|
|
|
|
tsn = ntohl(req->send_reset_at_tsn);
|
|
|
|
|
|
|
|
/* move the reset action back one */
|
|
|
|
asoc->last_reset_action[1] = asoc->last_reset_action[0];
|
|
|
|
if ((tsn == asoc->cumulative_tsn) ||
|
|
|
|
(compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) {
|
|
|
|
/* we can do it now */
|
|
|
|
sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
|
|
|
|
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
|
|
|
|
asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* we must queue it up and thus wait for the TSN's
|
|
|
|
* to arrive that are at or before tsn
|
|
|
|
*/
|
|
|
|
struct sctp_stream_reset_list *liste;
|
|
|
|
int siz;
|
|
|
|
|
|
|
|
siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
|
|
|
|
SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
|
|
|
|
siz, "StrRstList");
|
|
|
|
if (liste == NULL) {
|
|
|
|
/* gak out of memory */
|
|
|
|
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
|
|
|
|
asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
liste->tsn = tsn;
|
|
|
|
liste->number_entries = number_entries;
|
|
|
|
memcpy(&liste->req, req,
|
|
|
|
(sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
|
|
|
|
TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
|
|
|
|
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
|
|
|
|
asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
|
|
|
|
}
|
|
|
|
asoc->str_reset_seq_in++;
|
|
|
|
} else if ((asoc->str_reset_seq_in - 1) == seq) {
|
|
|
|
/*
|
|
|
|
* one seq back, just echo back last action since my
|
|
|
|
* response was lost.
|
|
|
|
*/
|
|
|
|
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
|
|
|
|
} else if ((asoc->str_reset_seq_in - 2) == seq) {
|
|
|
|
/*
|
|
|
|
* two seq back, just echo back last action since my
|
|
|
|
* response was lost.
|
|
|
|
*/
|
|
|
|
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
|
|
|
|
} else {
|
|
|
|
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
sctp_handle_stream_reset(struct sctp_tcb *stcb, struct sctp_stream_reset_out_req *sr_req)
|
|
|
|
{
|
|
|
|
int chk_length, param_len, ptype;
|
|
|
|
uint32_t seq;
|
|
|
|
int num_req = 0;
|
|
|
|
struct sctp_tmit_chunk *chk;
|
|
|
|
struct sctp_chunkhdr *ch;
|
|
|
|
struct sctp_paramhdr *ph;
|
|
|
|
|
|
|
|
/* now it may be a reset or a reset-response */
|
|
|
|
chk_length = ntohs(sr_req->ch.chunk_length);
|
|
|
|
int ret_code = 0;
|
|
|
|
int num_param = 0;
|
|
|
|
|
|
|
|
/* setup for adding the response */
|
|
|
|
sctp_alloc_a_chunk(stcb, chk);
|
|
|
|
if (chk == NULL) {
|
|
|
|
return (ret_code);
|
|
|
|
}
|
|
|
|
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
|
|
|
|
chk->asoc = &stcb->asoc;
|
|
|
|
chk->no_fr_allowed = 0;
|
|
|
|
chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
|
|
|
|
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
|
|
|
|
if (chk->data == NULL) {
|
|
|
|
strres_nochunk:
|
|
|
|
if (chk->data) {
|
|
|
|
sctp_m_freem(chk->data);
|
|
|
|
chk->data = NULL;
|
|
|
|
}
|
|
|
|
sctp_free_a_chunk(stcb, chk);
|
|
|
|
return (ret_code);
|
|
|
|
}
|
|
|
|
chk->data->m_data += SCTP_MIN_OVERHEAD;
|
|
|
|
|
|
|
|
/* setup chunk parameters */
|
|
|
|
chk->sent = SCTP_DATAGRAM_UNSENT;
|
|
|
|
chk->snd_count = 0;
|
|
|
|
chk->whoTo = stcb->asoc.primary_destination;
|
|
|
|
atomic_add_int(&chk->whoTo->ref_count, 1);
|
|
|
|
|
|
|
|
ch = mtod(chk->data, struct sctp_chunkhdr *);
|
|
|
|
ch->chunk_type = SCTP_STREAM_RESET;
|
|
|
|
ch->chunk_flags = 0;
|
|
|
|
ch->chunk_length = htons(chk->send_size);
|
|
|
|
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
|
|
|
|
|
|
|
|
|
|
|
|
ph = (struct sctp_paramhdr *)&sr_req->sr_req;
|
|
|
|
while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
|
|
|
|
param_len = ntohs(ph->param_length);
|
|
|
|
if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
|
|
|
|
/* bad param */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
ptype = ntohs(ph->param_type);
|
|
|
|
num_param++;
|
|
|
|
if (num_param > SCTP_MAX_RESET_PARAMS) {
|
|
|
|
/* hit the max of parameters already sorry.. */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
|
|
|
|
struct sctp_stream_reset_out_request *req_out;
|
|
|
|
|
|
|
|
req_out = (struct sctp_stream_reset_out_request *)ph;
|
|
|
|
num_req++;
|
|
|
|
if (stcb->asoc.stream_reset_outstanding) {
|
|
|
|
seq = ntohl(req_out->response_seq);
|
|
|
|
if (seq == stcb->asoc.str_reset_seq_out) {
|
|
|
|
/* implicit ack */
|
|
|
|
sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
sctp_handle_str_reset_request_out(stcb, chk, req_out);
|
|
|
|
} else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
|
|
|
|
struct sctp_stream_reset_in_request *req_in;
|
|
|
|
|
|
|
|
num_req++;
|
|
|
|
req_in = (struct sctp_stream_reset_in_request *)ph;
|
|
|
|
sctp_handle_str_reset_request_in(stcb, chk, req_in);
|
|
|
|
} else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
|
|
|
|
struct sctp_stream_reset_tsn_request *req_tsn;
|
|
|
|
|
|
|
|
num_req++;
|
|
|
|
req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
|
|
|
|
if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
|
|
|
|
ret_code = 1;
|
|
|
|
goto strres_nochunk;
|
|
|
|
}
|
|
|
|
/* no more */
|
|
|
|
break;
|
|
|
|
} else if (ptype == SCTP_STR_RESET_RESPONSE) {
|
|
|
|
struct sctp_stream_reset_response *resp;
|
|
|
|
uint32_t result;
|
|
|
|
|
|
|
|
resp = (struct sctp_stream_reset_response *)ph;
|
|
|
|
seq = ntohl(resp->response_seq);
|
|
|
|
result = ntohl(resp->result);
|
|
|
|
if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
|
|
|
|
ret_code = 1;
|
|
|
|
goto strres_nochunk;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
ph = (struct sctp_paramhdr *)((caddr_t)ph + SCTP_SIZE32(param_len));
|
|
|
|
chk_length -= SCTP_SIZE32(param_len);
|
|
|
|
}
|
|
|
|
if (num_req == 0) {
|
|
|
|
/* we have no response free the stuff */
|
|
|
|
goto strres_nochunk;
|
|
|
|
}
|
|
|
|
/* ok we have a chunk to link in */
|
|
|
|
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
|
|
|
|
chk,
|
|
|
|
sctp_next);
|
|
|
|
stcb->asoc.ctrl_queue_cnt++;
|
|
|
|
return (ret_code);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle a router or endpoints report of a packet loss, there are two ways
|
|
|
|
* to handle this, either we get the whole packet and must disect it
|
|
|
|
* ourselves (possibly with truncation and or corruption) or it is a summary
|
|
|
|
* from a middle box that did the disectting for us.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
|
|
{
|
|
|
|
uint32_t bottle_bw, on_queue;
|
|
|
|
uint16_t trunc_len;
|
|
|
|
unsigned int chlen;
|
|
|
|
unsigned int at;
|
|
|
|
struct sctp_chunk_desc desc;
|
|
|
|
struct sctp_chunkhdr *ch;
|
|
|
|
|
|
|
|
chlen = ntohs(cp->ch.chunk_length);
|
|
|
|
chlen -= sizeof(struct sctp_pktdrop_chunk);
|
|
|
|
/* XXX possible chlen underflow */
|
|
|
|
if (chlen == 0) {
|
|
|
|
ch = NULL;
|
|
|
|
if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpbwrpt);
|
|
|
|
} else {
|
|
|
|
ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
|
|
|
|
chlen -= sizeof(struct sctphdr);
|
|
|
|
/* XXX possible chlen underflow */
|
|
|
|
memset(&desc, 0, sizeof(desc));
|
|
|
|
}
|
|
|
|
trunc_len = (uint16_t) ntohs(cp->trunc_len);
|
|
|
|
/* now the chunks themselves */
|
|
|
|
while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
|
|
|
|
desc.chunk_type = ch->chunk_type;
|
|
|
|
/* get amount we need to move */
|
|
|
|
at = ntohs(ch->chunk_length);
|
|
|
|
if (at < sizeof(struct sctp_chunkhdr)) {
|
|
|
|
/* corrupt chunk, maybe at the end? */
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpcrupt);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (trunc_len == 0) {
|
|
|
|
/* we are supposed to have all of it */
|
|
|
|
if (at > chlen) {
|
|
|
|
/* corrupt skip it */
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpcrupt);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* is there enough of it left ? */
|
|
|
|
if (desc.chunk_type == SCTP_DATA) {
|
|
|
|
if (chlen < (sizeof(struct sctp_data_chunk) +
|
|
|
|
sizeof(desc.data_bytes))) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (chlen < sizeof(struct sctp_chunkhdr)) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (desc.chunk_type == SCTP_DATA) {
|
|
|
|
/* can we get out the tsn? */
|
|
|
|
if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpmbda);
|
|
|
|
|
|
|
|
if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
|
|
|
|
/* yep */
|
|
|
|
struct sctp_data_chunk *dcp;
|
|
|
|
uint8_t *ddp;
|
|
|
|
unsigned int iii;
|
|
|
|
|
|
|
|
dcp = (struct sctp_data_chunk *)ch;
|
|
|
|
ddp = (uint8_t *) (dcp + 1);
|
|
|
|
for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
|
|
|
|
desc.data_bytes[iii] = ddp[iii];
|
|
|
|
}
|
|
|
|
desc.tsn_ifany = dcp->dp.tsn;
|
|
|
|
} else {
|
|
|
|
/* nope we are done. */
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpnedat);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpmbct);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
|
|
|
|
SCTP_STAT_INCR(sctps_pdrppdbrk);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (SCTP_SIZE32(at) > chlen) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
chlen -= SCTP_SIZE32(at);
|
|
|
|
if (chlen < sizeof(struct sctp_chunkhdr)) {
|
|
|
|
/* done, none left */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
|
|
|
|
}
|
|
|
|
/* Now update any rwnd --- possibly */
|
|
|
|
if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
|
|
|
|
/* From a peer, we get a rwnd report */
|
|
|
|
uint32_t a_rwnd;
|
|
|
|
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpfehos);
|
|
|
|
|
|
|
|
bottle_bw = ntohl(cp->bottle_bw);
|
|
|
|
on_queue = ntohl(cp->current_onq);
|
|
|
|
if (bottle_bw && on_queue) {
|
|
|
|
/* a rwnd report is in here */
|
|
|
|
if (bottle_bw > on_queue)
|
|
|
|
a_rwnd = bottle_bw - on_queue;
|
|
|
|
else
|
|
|
|
a_rwnd = 0;
|
|
|
|
|
|
|
|
if (a_rwnd == 0)
|
|
|
|
stcb->asoc.peers_rwnd = 0;
|
|
|
|
else {
|
|
|
|
if (a_rwnd > stcb->asoc.total_flight) {
|
|
|
|
stcb->asoc.peers_rwnd =
|
|
|
|
a_rwnd - stcb->asoc.total_flight;
|
|
|
|
} else {
|
|
|
|
stcb->asoc.peers_rwnd = 0;
|
|
|
|
}
|
|
|
|
if (stcb->asoc.peers_rwnd <
|
|
|
|
stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
|
|
|
|
/* SWS sender side engages */
|
|
|
|
stcb->asoc.peers_rwnd = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
SCTP_STAT_INCR(sctps_pdrpfmbox);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now middle boxes in sat networks get a cwnd bump */
|
|
|
|
if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
|
|
|
|
(stcb->asoc.sat_t3_loss_recovery == 0) &&
|
|
|
|
(stcb->asoc.sat_network)) {
|
|
|
|
/*
|
|
|
|
* This is debateable but for sat networks it makes sense
|
|
|
|
* Note if a T3 timer has went off, we will prohibit any
|
|
|
|
* changes to cwnd until we exit the t3 loss recovery.
|
|
|
|
*/
|
|
|
|
uint32_t bw_avail;
|
|
|
|
int rtt, incr;
|
|
|
|
|
|
|
|
#ifdef SCTP_CWND_MONITOR
|
|
|
|
int old_cwnd = net->cwnd;
|
|
|
|
|
|
|
|
#endif
|
|
|
|
/* need real RTT for this calc */
|
|
|
|
rtt = ((net->lastsa >> 2) + net->lastsv) >> 1;
|
|
|
|
/* get bottle neck bw */
|
|
|
|
bottle_bw = ntohl(cp->bottle_bw);
|
|
|
|
/* and whats on queue */
|
|
|
|
on_queue = ntohl(cp->current_onq);
|
|
|
|
/*
|
|
|
|
* adjust the on-queue if our flight is more it could be
|
|
|
|
* that the router has not yet gotten data "in-flight" to it
|
|
|
|
*/
|
|
|
|
if (on_queue < net->flight_size)
|
|
|
|
on_queue = net->flight_size;
|
|
|
|
|
|
|
|
/* calculate the available space */
|
|
|
|
bw_avail = (bottle_bw * rtt) / 1000;
|
|
|
|
if (bw_avail > bottle_bw) {
|
|
|
|
/*
|
|
|
|
* Cap the growth to no more than the bottle neck.
|
|
|
|
* This can happen as RTT slides up due to queues.
|
|
|
|
* It also means if you have more than a 1 second
|
|
|
|
* RTT with a empty queue you will be limited to the
|
|
|
|
* bottle_bw per second no matter if other points
|
|
|
|
* have 1/2 the RTT and you could get more out...
|
|
|
|
*/
|
|
|
|
bw_avail = bottle_bw;
|
|
|
|
}
|
|
|
|
if (on_queue > bw_avail) {
|
|
|
|
/*
|
|
|
|
* No room for anything else don't allow anything
|
|
|
|
* else to be "added to the fire".
|
|
|
|
*/
|
|
|
|
int seg_inflight, seg_onqueue, my_portion;
|
|
|
|
|
|
|
|
net->partial_bytes_acked = 0;
|
|
|
|
|
|
|
|
/* how much are we over queue size? */
|
|
|
|
incr = on_queue - bw_avail;
|
|
|
|
if (stcb->asoc.seen_a_sack_this_pkt) {
|
|
|
|
/*
|
|
|
|
* undo any cwnd adjustment that the sack
|
|
|
|
* might have made
|
|
|
|
*/
|
|
|
|
net->cwnd = net->prev_cwnd;
|
|
|
|
}
|
|
|
|
/* Now how much of that is mine? */
|
|
|
|
seg_inflight = net->flight_size / net->mtu;
|
|
|
|
seg_onqueue = on_queue / net->mtu;
|
|
|
|
my_portion = (incr * seg_inflight) / seg_onqueue;
|
|
|
|
|
|
|
|
/* Have I made an adjustment already */
|
|
|
|
if (net->cwnd > net->flight_size) {
|
|
|
|
/*
|
|
|
|
* for this flight I made an adjustment we
|
|
|
|
* need to decrease the portion by a share
|
|
|
|
* our previous adjustment.
|
|
|
|
*/
|
|
|
|
int diff_adj;
|
|
|
|
|
|
|
|
diff_adj = net->cwnd - net->flight_size;
|
|
|
|
if (diff_adj > my_portion)
|
|
|
|
my_portion = 0;
|
|
|
|
else
|
|
|
|
my_portion -= diff_adj;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* back down to the previous cwnd (assume we have
|
|
|
|
* had a sack before this packet). minus what ever
|
|
|
|
* portion of the overage is my fault.
|
|
|
|
*/
|
|
|
|
net->cwnd -= my_portion;
|
|
|
|
|
|
|
|
/* we will NOT back down more than 1 MTU */
|
|
|
|
if (net->cwnd <= net->mtu) {
|
|
|
|
net->cwnd = net->mtu;
|
|
|
|
}
|
|
|
|
/* force into CA */
|
|
|
|
net->ssthresh = net->cwnd - 1;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Take 1/4 of the space left or max burst up ..
|
|
|
|
* whichever is less.
|
|
|
|
*/
|
|
|
|
incr = min((bw_avail - on_queue) >> 2,
|
|
|
|
(int)stcb->asoc.max_burst * (int)net->mtu);
|
|
|
|
net->cwnd += incr;
|
|
|
|
}
|
|
|
|
if (net->cwnd > bw_avail) {
|
|
|
|
/* We can't exceed the pipe size */
|
|
|
|
net->cwnd = bw_avail;
|
|
|
|
}
|
|
|
|
if (net->cwnd < net->mtu) {
|
|
|
|
/* We always have 1 MTU */
|
|
|
|
net->cwnd = net->mtu;
|
|
|
|
}
|
|
|
|
#ifdef SCTP_CWND_MONITOR
|
|
|
|
if (net->cwnd - old_cwnd != 0) {
|
|
|
|
/* log only changes */
|
|
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
|
|
|
|
SCTP_CWND_LOG_FROM_SAT);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
extern int sctp_strict_init;
|
|
|
|
extern int sctp_abort_if_one_2_one_hits_limit;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
|
|
|
|
* still contain IP/SCTP header - stcb: is the tcb found for this packet -
|
|
|
|
* offset: offset into the mbuf chain to first chunkhdr - length: is the
|
|
|
|
* length of the complete packet outputs: - length: modified to remaining
|
|
|
|
* length after control processing - netp: modified to new sctp_nets after
|
|
|
|
* cookie-echo processing - return NULL to discard the packet (ie. no asoc,
|
|
|
|
* bad packet,...) otherwise return the tcb for this packet
|
|
|
|
*/
|
|
|
|
static struct sctp_tcb *
|
|
|
|
sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
|
|
|
|
struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
|
|
|
|
struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen)
|
|
|
|
{
|
|
|
|
struct sctp_association *asoc;
|
|
|
|
uint32_t vtag_in;
|
|
|
|
int num_chunks = 0; /* number of control chunks processed */
|
|
|
|
int chk_length;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* How big should this be, and should it be alloc'd? Lets try the
|
|
|
|
* d-mtu-ceiling for now (2k) and that should hopefully work ...
|
|
|
|
* until we get into jumbo grams and such..
|
|
|
|
*/
|
|
|
|
uint8_t chunk_buf[DEFAULT_CHUNK_BUFFER];
|
|
|
|
struct sctp_tcb *locked_tcb = stcb;
|
|
|
|
int got_auth = 0;
|
|
|
|
uint32_t auth_offset = 0, auth_len = 0;
|
|
|
|
int auth_skipped = 0;
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
|
|
|
|
iphlen, *offset, length, stcb);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
|
|
|
|
/* validate chunk header length... */
|
|
|
|
if (ntohs(ch->chunk_length) < sizeof(*ch)) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* validate the verification tag
|
|
|
|
*/
|
|
|
|
vtag_in = ntohl(sh->v_tag);
|
|
|
|
|
|
|
|
if (ch->chunk_type == SCTP_INITIATION) {
|
|
|
|
if (vtag_in != 0) {
|
|
|
|
/* protocol error- silently discard... */
|
|
|
|
SCTP_STAT_INCR(sctps_badvtag);
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
} else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
|
|
|
|
/*
|
|
|
|
* If there is no stcb, skip the AUTH chunk and process
|
|
|
|
* later after a stcb is found (to validate the lookup was
|
|
|
|
* valid.
|
|
|
|
*/
|
|
|
|
if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
|
|
|
|
(stcb == NULL) && !sctp_auth_disable) {
|
|
|
|
/* save this chunk for later processing */
|
|
|
|
auth_skipped = 1;
|
|
|
|
auth_offset = *offset;
|
|
|
|
auth_len = ntohs(ch->chunk_length);
|
|
|
|
|
|
|
|
/* (temporarily) move past this chunk */
|
|
|
|
*offset += SCTP_SIZE32(auth_len);
|
|
|
|
if (*offset >= length) {
|
|
|
|
/* no more data left in the mbuf chain */
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
sizeof(struct sctp_chunkhdr), chunk_buf);
|
|
|
|
}
|
|
|
|
if (ch->chunk_type == SCTP_COOKIE_ECHO) {
|
|
|
|
goto process_control_chunks;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* first check if it's an ASCONF with an unknown src addr we
|
|
|
|
* need to look inside to find the association
|
|
|
|
*/
|
|
|
|
if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
|
|
|
|
/* inp's refcount may be reduced */
|
|
|
|
SCTP_INP_INCR_REF(inp);
|
|
|
|
|
|
|
|
stcb = sctp_findassociation_ep_asconf(m, iphlen,
|
|
|
|
*offset, sh, &inp, netp);
|
|
|
|
if (stcb == NULL) {
|
|
|
|
/*
|
|
|
|
* reduce inp's refcount if not reduced in
|
|
|
|
* sctp_findassociation_ep_asconf().
|
|
|
|
*/
|
|
|
|
SCTP_INP_DECR_REF(inp);
|
|
|
|
}
|
|
|
|
/* now go back and verify any auth chunk to be sure */
|
|
|
|
if (auth_skipped && (stcb != NULL)) {
|
|
|
|
struct sctp_auth_chunk *auth;
|
|
|
|
|
|
|
|
auth = (struct sctp_auth_chunk *)
|
|
|
|
sctp_m_getptr(m, auth_offset,
|
|
|
|
auth_len, chunk_buf);
|
|
|
|
got_auth = 1;
|
|
|
|
auth_skipped = 0;
|
|
|
|
if (sctp_handle_auth(stcb, auth, m,
|
|
|
|
auth_offset)) {
|
|
|
|
/* auth HMAC failed so dump it */
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
} else {
|
|
|
|
/* remaining chunks are HMAC checked */
|
|
|
|
stcb->asoc.authenticated = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (stcb == NULL) {
|
|
|
|
/* no association, so it's out of the blue... */
|
|
|
|
sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL);
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
asoc = &stcb->asoc;
|
|
|
|
/* ABORT and SHUTDOWN can use either v_tag... */
|
|
|
|
if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
|
|
|
|
(ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
|
|
|
|
(ch->chunk_type == SCTP_PACKET_DROPPED)) {
|
|
|
|
if ((vtag_in == asoc->my_vtag) ||
|
|
|
|
((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
|
|
|
|
(vtag_in == asoc->peer_vtag))) {
|
|
|
|
/* this is valid */
|
|
|
|
} else {
|
|
|
|
/* drop this packet... */
|
|
|
|
SCTP_STAT_INCR(sctps_badvtag);
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
} else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
|
|
|
|
if (vtag_in != asoc->my_vtag) {
|
|
|
|
/*
|
|
|
|
* this could be a stale SHUTDOWN-ACK or the
|
|
|
|
* peer never got the SHUTDOWN-COMPLETE and
|
|
|
|
* is still hung; we have started a new asoc
|
|
|
|
* but it won't complete until the shutdown
|
|
|
|
* is completed
|
|
|
|
*/
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
sctp_handle_ootb(m, iphlen, *offset, sh, inp,
|
|
|
|
NULL);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* for all other chunks, vtag must match */
|
|
|
|
if (vtag_in != asoc->my_vtag) {
|
|
|
|
/* invalid vtag... */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("invalid vtag: %xh, expect %xh\n", vtag_in, asoc->my_vtag);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
SCTP_STAT_INCR(sctps_badvtag);
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} /* end if !SCTP_COOKIE_ECHO */
|
|
|
|
/*
|
|
|
|
* process all control chunks...
|
|
|
|
*/
|
|
|
|
if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
|
|
|
|
(ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
|
|
|
|
(SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
|
|
|
|
/* implied cookie-ack.. we must have lost the ack */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
|
|
|
|
*netp);
|
|
|
|
}
|
|
|
|
process_control_chunks:
|
|
|
|
|
|
|
|
while (IS_SCTP_CONTROL(ch)) {
|
|
|
|
/* validate chunk length */
|
|
|
|
chk_length = ntohs(ch->chunk_length);
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
|
|
|
|
printf("sctp_process_control: processing a chunk type=%u, len=%u\n",
|
|
|
|
ch->chunk_type, chk_length);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
if ((size_t)chk_length < sizeof(*ch) ||
|
|
|
|
(*offset + chk_length) > length) {
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
|
|
|
|
/*
|
|
|
|
* INIT-ACK only gets the init ack "header" portion only
|
|
|
|
* because we don't have to process the peer's COOKIE. All
|
|
|
|
* others get a complete chunk.
|
|
|
|
*/
|
|
|
|
if (ch->chunk_type == SCTP_INITIATION_ACK) {
|
|
|
|
/* get an init-ack chunk */
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
sizeof(struct sctp_init_ack_chunk), chunk_buf);
|
|
|
|
if (ch == NULL) {
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* get a complete chunk... */
|
|
|
|
if ((size_t)chk_length > sizeof(chunk_buf)) {
|
|
|
|
struct mbuf *oper;
|
|
|
|
struct sctp_paramhdr *phdr;
|
|
|
|
|
|
|
|
oper = NULL;
|
|
|
|
oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
|
|
|
|
1, M_DONTWAIT, 1, MT_DATA);
|
|
|
|
if (oper) {
|
|
|
|
/* pre-reserve some space */
|
|
|
|
oper->m_data += sizeof(struct sctp_chunkhdr);
|
|
|
|
oper->m_len = sizeof(struct sctp_paramhdr);
|
|
|
|
oper->m_pkthdr.len = oper->m_len;
|
|
|
|
phdr = mtod(oper, struct sctp_paramhdr *);
|
|
|
|
phdr->param_type = htons(SCTP_CAUSE_OUT_OF_RESC);
|
|
|
|
phdr->param_length = htons(sizeof(struct sctp_paramhdr));
|
|
|
|
sctp_queue_op_err(stcb, oper);
|
|
|
|
}
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
chk_length, chunk_buf);
|
|
|
|
if (ch == NULL) {
|
|
|
|
printf("sctp_process_control: Can't get the all data....\n");
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
num_chunks++;
|
|
|
|
/* Save off the last place we got a control from */
|
|
|
|
if (stcb != NULL) {
|
|
|
|
if ((*netp != NULL) || (ch->chunk_type == SCTP_ASCONF)) {
|
|
|
|
/*
|
|
|
|
* allow last_control to be NULL if
|
|
|
|
* ASCONF... ASCONF processing will find the
|
|
|
|
* right net later
|
|
|
|
*/
|
|
|
|
stcb->asoc.last_control_chunk_from = *netp;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#ifdef SCTP_AUDITING_ENABLED
|
|
|
|
sctp_audit_log(0xB0, ch->chunk_type);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* check to see if this chunk required auth, but isn't */
|
|
|
|
if ((stcb != NULL) && !sctp_auth_disable &&
|
|
|
|
sctp_auth_is_required_chunk(ch->chunk_type,
|
|
|
|
stcb->asoc.local_auth_chunks) &&
|
|
|
|
!stcb->asoc.authenticated) {
|
|
|
|
/* "silently" ignore */
|
|
|
|
SCTP_STAT_INCR(sctps_recvauthmissing);
|
|
|
|
goto next_chunk;
|
|
|
|
}
|
|
|
|
switch (ch->chunk_type) {
|
|
|
|
case SCTP_INITIATION:
|
|
|
|
/* must be first and only chunk */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_INIT\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
|
|
|
|
/* We are not interested anymore? */
|
|
|
|
if ((stcb) && (stcb->asoc.total_output_queue_size)) {
|
|
|
|
/*
|
|
|
|
* collision case where we are
|
|
|
|
* sending to them too
|
|
|
|
*/
|
|
|
|
;
|
|
|
|
} else {
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if ((num_chunks > 1) ||
|
|
|
|
(sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) {
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if ((stcb != NULL) &&
|
|
|
|
(SCTP_GET_STATE(&stcb->asoc) ==
|
|
|
|
SCTP_STATE_SHUTDOWN_ACK_SENT)) {
|
|
|
|
sctp_send_shutdown_ack(stcb,
|
|
|
|
stcb->asoc.primary_destination);
|
|
|
|
*offset = length;
|
|
|
|
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC);
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
sctp_handle_init(m, iphlen, *offset, sh,
|
|
|
|
(struct sctp_init_chunk *)ch, inp, stcb, *netp);
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
break;
|
|
|
|
case SCTP_INITIATION_ACK:
|
|
|
|
/* must be first and only chunk */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_INIT-ACK\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
|
|
|
|
/* We are not interested anymore */
|
|
|
|
if ((stcb) && (stcb->asoc.total_output_queue_size)) {
|
|
|
|
;
|
|
|
|
} else {
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
*offset = length;
|
|
|
|
if (stcb) {
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
}
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if ((num_chunks > 1) ||
|
|
|
|
(sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) {
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
|
|
|
|
(struct sctp_init_ack_chunk *)ch, stcb, *netp);
|
|
|
|
/*
|
|
|
|
* Special case, I must call the output routine to
|
|
|
|
* get the cookie echoed
|
|
|
|
*/
|
|
|
|
if ((stcb) && ret == 0)
|
|
|
|
sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC);
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
return (NULL);
|
|
|
|
break;
|
|
|
|
case SCTP_SELECTIVE_ACK:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_SACK\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
SCTP_STAT_INCR(sctps_recvsacks);
|
|
|
|
{
|
|
|
|
struct sctp_sack_chunk *sack;
|
|
|
|
int abort_now = 0;
|
|
|
|
uint32_t a_rwnd, cum_ack;
|
|
|
|
uint16_t num_seg;
|
|
|
|
int nonce_sum_flag;
|
|
|
|
|
|
|
|
sack = (struct sctp_sack_chunk *)ch;
|
|
|
|
|
|
|
|
nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM;
|
|
|
|
cum_ack = ntohl(sack->sack.cum_tsn_ack);
|
|
|
|
num_seg = ntohs(sack->sack.num_gap_ack_blks);
|
|
|
|
a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
|
|
|
|
stcb->asoc.seen_a_sack_this_pkt = 1;
|
|
|
|
if ((stcb->asoc.pr_sctp_cnt == 0) &&
|
|
|
|
(num_seg == 0) &&
|
|
|
|
((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) ||
|
|
|
|
(cum_ack == stcb->asoc.last_acked_seq)) &&
|
|
|
|
(stcb->asoc.saw_sack_with_frags == 0) &&
|
|
|
|
(!TAILQ_EMPTY(&stcb->asoc.sent_queue))
|
|
|
|
) {
|
|
|
|
/*
|
|
|
|
* We have a SIMPLE sack having no
|
|
|
|
* prior segments and data on sent
|
|
|
|
* queue to be acked.. Use the
|
|
|
|
* faster path sack processing. We
|
|
|
|
* also allow window update sacks
|
|
|
|
* with no missing segments to go
|
|
|
|
* this way too.
|
|
|
|
*/
|
|
|
|
sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, &abort_now);
|
|
|
|
} else {
|
|
|
|
sctp_handle_sack(sack, stcb, *netp, &abort_now);
|
|
|
|
}
|
|
|
|
if (abort_now) {
|
|
|
|
/* ABORT signal from sack processing */
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_HEARTBEAT_REQUEST:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_HEARTBEAT\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
SCTP_STAT_INCR(sctps_recvheartbeat);
|
|
|
|
sctp_send_heartbeat_ack(stcb, m, *offset, chk_length,
|
|
|
|
*netp);
|
|
|
|
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
break;
|
|
|
|
case SCTP_HEARTBEAT_ACK:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_HEARTBEAT-ACK\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
SCTP_STAT_INCR(sctps_recvheartbeatack);
|
|
|
|
sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
|
|
|
|
stcb, *netp);
|
|
|
|
break;
|
|
|
|
case SCTP_ABORT_ASSOCIATION:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_ABORT\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
sctp_handle_abort((struct sctp_abort_chunk *)ch,
|
|
|
|
stcb, *netp);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
break;
|
|
|
|
case SCTP_SHUTDOWN:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_SHUTDOWN\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
{
|
|
|
|
int abort_flag = 0;
|
|
|
|
|
|
|
|
sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
|
|
|
|
stcb, *netp, &abort_flag);
|
|
|
|
if (abort_flag) {
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_SHUTDOWN_ACK:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_SHUTDOWN-ACK\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
break;
|
|
|
|
case SCTP_OPERATION_ERROR:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_OP-ERR\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
if (sctp_handle_error(ch, stcb, *netp) < 0) {
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_COOKIE_ECHO:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_COOKIE-ECHO stcb is %p\n", stcb);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
if ((stcb) && (stcb->asoc.total_output_queue_size)) {
|
|
|
|
;
|
|
|
|
} else {
|
|
|
|
if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) &&
|
|
|
|
(stcb == NULL)) {
|
|
|
|
/* We are not interested anymore */
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* First are we accepting? We do this again here
|
|
|
|
* since it is possible that a previous endpoint WAS
|
|
|
|
* listening responded to a INIT-ACK and then
|
|
|
|
* closed. We opened and bound.. and are now no
|
|
|
|
* longer listening.
|
|
|
|
*/
|
|
|
|
if (inp->sctp_socket->so_qlimit == 0) {
|
|
|
|
if ((stcb) && (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
|
|
|
|
/*
|
|
|
|
* special case, is this a retran'd
|
|
|
|
* COOKIE-ECHO or a restarting assoc
|
|
|
|
* that is a peeled off or
|
|
|
|
* one-to-one style socket.
|
|
|
|
*/
|
|
|
|
goto process_cookie_anyway;
|
|
|
|
}
|
|
|
|
sctp_abort_association(inp, stcb, m, iphlen, sh,
|
|
|
|
NULL);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
} else if (inp->sctp_socket->so_qlimit) {
|
|
|
|
/* we are accepting so check limits like TCP */
|
|
|
|
if (inp->sctp_socket->so_qlen >
|
|
|
|
inp->sctp_socket->so_qlimit) {
|
|
|
|
/* no space */
|
|
|
|
struct mbuf *oper;
|
|
|
|
struct sctp_paramhdr *phdr;
|
|
|
|
|
|
|
|
if (sctp_abort_if_one_2_one_hits_limit) {
|
|
|
|
oper = NULL;
|
|
|
|
oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
|
|
|
|
1, M_DONTWAIT, 1, MT_DATA);
|
|
|
|
if (oper) {
|
|
|
|
oper->m_len =
|
|
|
|
oper->m_pkthdr.len =
|
|
|
|
sizeof(struct sctp_paramhdr);
|
|
|
|
phdr = mtod(oper,
|
|
|
|
struct sctp_paramhdr *);
|
|
|
|
phdr->param_type =
|
|
|
|
htons(SCTP_CAUSE_OUT_OF_RESC);
|
|
|
|
phdr->param_length =
|
|
|
|
htons(sizeof(struct sctp_paramhdr));
|
|
|
|
}
|
|
|
|
sctp_abort_association(inp, stcb, m,
|
|
|
|
iphlen, sh, oper);
|
|
|
|
}
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
process_cookie_anyway:
|
|
|
|
{
|
|
|
|
struct mbuf *ret_buf;
|
|
|
|
|
|
|
|
ret_buf =
|
|
|
|
sctp_handle_cookie_echo(m, iphlen,
|
|
|
|
*offset, sh,
|
|
|
|
(struct sctp_cookie_echo_chunk *)ch,
|
|
|
|
&inp, &stcb, netp,
|
|
|
|
auth_skipped,
|
|
|
|
auth_offset,
|
|
|
|
auth_len);
|
|
|
|
|
|
|
|
if (ret_buf == NULL) {
|
|
|
|
if (locked_tcb) {
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
}
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("GAK, null buffer\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
auth_skipped = 0;
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
/* if AUTH skipped, see if it verified... */
|
|
|
|
if (auth_skipped) {
|
|
|
|
got_auth = 1;
|
|
|
|
auth_skipped = 0;
|
|
|
|
}
|
|
|
|
if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
|
|
|
|
/*
|
|
|
|
* Restart the timer if we have
|
|
|
|
* pending data
|
|
|
|
*/
|
|
|
|
struct sctp_tmit_chunk *chk;
|
|
|
|
|
|
|
|
chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
|
|
|
|
if (chk) {
|
|
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
|
|
|
|
stcb->sctp_ep, stcb,
|
|
|
|
chk->whoTo);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_COOKIE_ACK:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_COOKIE-ACK\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
|
|
|
|
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
|
|
|
|
/* We are not interested anymore */
|
|
|
|
if ((stcb) && (stcb->asoc.total_output_queue_size)) {
|
|
|
|
;
|
|
|
|
} else {
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
|
|
|
|
break;
|
|
|
|
case SCTP_ECN_ECHO:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_ECN-ECHO\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
|
|
|
|
stcb);
|
|
|
|
break;
|
|
|
|
case SCTP_ECN_CWR:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_ECN-CWR\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
|
|
|
|
sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb);
|
|
|
|
break;
|
|
|
|
case SCTP_SHUTDOWN_COMPLETE:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_SHUTDOWN-COMPLETE\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* must be first and only chunk */
|
|
|
|
if ((num_chunks > 1) ||
|
|
|
|
(length - *offset > SCTP_SIZE32(chk_length))) {
|
|
|
|
*offset = length;
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
|
|
|
|
stcb, *netp);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
break;
|
|
|
|
case SCTP_ASCONF:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_ASCONF\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
|
|
|
|
sctp_handle_asconf(m, *offset,
|
|
|
|
(struct sctp_asconf_chunk *)ch, stcb);
|
|
|
|
break;
|
|
|
|
case SCTP_ASCONF_ACK:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_ASCONF-ACK\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
|
|
|
|
sctp_handle_asconf_ack(m, *offset,
|
|
|
|
(struct sctp_asconf_ack_chunk *)ch, stcb, *netp);
|
|
|
|
break;
|
|
|
|
case SCTP_FORWARD_CUM_TSN:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_FWD-TSN\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* He's alive so give him credit */
|
|
|
|
{
|
|
|
|
int abort_flag = 0;
|
|
|
|
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
*fwd_tsn_seen = 1;
|
|
|
|
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
|
|
|
|
/* We are not interested anymore */
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
sctp_handle_forward_tsn(stcb,
|
|
|
|
(struct sctp_forward_tsn_chunk *)ch, &abort_flag);
|
|
|
|
if (abort_flag) {
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
} else {
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_STREAM_RESET:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_STREAM_RESET\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
chk_length, chunk_buf);
|
|
|
|
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
|
|
|
|
/* We are not interested anymore */
|
|
|
|
sctp_free_assoc(inp, stcb, 0);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (stcb->asoc.peer_supports_strreset == 0) {
|
|
|
|
/*
|
|
|
|
* hmm, peer should have announced this, but
|
|
|
|
* we will turn it on since he is sending us
|
|
|
|
* a stream reset.
|
|
|
|
*/
|
|
|
|
stcb->asoc.peer_supports_strreset = 1;
|
|
|
|
}
|
|
|
|
if (sctp_handle_stream_reset(stcb, (struct sctp_stream_reset_out_req *)ch)) {
|
|
|
|
/* stop processing */
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SCTP_PACKET_DROPPED:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_PACKET_DROPPED\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
/* re-get it all please */
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
chk_length, chunk_buf);
|
|
|
|
|
|
|
|
sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
|
|
|
|
stcb, *netp);
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
case SCTP_AUTHENTICATION:
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("SCTP_AUTHENTICATION\n");
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
if (sctp_auth_disable)
|
|
|
|
goto unknown_chunk;
|
|
|
|
|
|
|
|
if (stcb == NULL) {
|
|
|
|
/* save the first AUTH for later processing */
|
|
|
|
if (auth_skipped == 0) {
|
|
|
|
auth_offset = *offset;
|
|
|
|
auth_len = chk_length;
|
|
|
|
auth_skipped = 1;
|
|
|
|
}
|
|
|
|
/* skip this chunk (temporarily) */
|
|
|
|
goto next_chunk;
|
|
|
|
}
|
|
|
|
if (got_auth == 1) {
|
|
|
|
/* skip this chunk... it's already auth'd */
|
|
|
|
goto next_chunk;
|
|
|
|
}
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
chk_length, chunk_buf);
|
|
|
|
got_auth = 1;
|
|
|
|
if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
|
|
|
|
m, *offset)) {
|
|
|
|
/* auth HMAC failed so dump the packet */
|
|
|
|
*offset = length;
|
|
|
|
return (stcb);
|
|
|
|
} else {
|
|
|
|
/* remaining chunks are HMAC checked */
|
|
|
|
stcb->asoc.authenticated = 1;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
unknown_chunk:
|
|
|
|
/* it's an unknown chunk! */
|
|
|
|
if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
|
|
|
|
struct mbuf *mm;
|
|
|
|
struct sctp_paramhdr *phd;
|
|
|
|
|
|
|
|
mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
|
|
|
|
1, M_DONTWAIT, 1, MT_DATA);
|
|
|
|
if (mm) {
|
|
|
|
phd = mtod(mm, struct sctp_paramhdr *);
|
|
|
|
/*
|
|
|
|
* We cheat and use param type since
|
|
|
|
* we did not bother to define a
|
|
|
|
* error cause struct. They are the
|
|
|
|
* same basic format with different
|
|
|
|
* names.
|
|
|
|
*/
|
|
|
|
phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
|
|
|
|
phd->param_length = htons(chk_length + sizeof(*phd));
|
|
|
|
mm->m_len = sizeof(*phd);
|
|
|
|
mm->m_next = sctp_m_copym(m, *offset, SCTP_SIZE32(chk_length),
|
|
|
|
M_DONTWAIT);
|
|
|
|
if (mm->m_next) {
|
|
|
|
mm->m_pkthdr.len = SCTP_SIZE32(chk_length) + sizeof(*phd);
|
|
|
|
sctp_queue_op_err(stcb, mm);
|
|
|
|
} else {
|
|
|
|
sctp_m_freem(mm);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if ((ch->chunk_type & 0x80) == 0) {
|
|
|
|
/* discard this packet */
|
|
|
|
*offset = length;
|
|
|
|
return (stcb);
|
|
|
|
} /* else skip this bad chunk and continue... */
|
|
|
|
break;
|
|
|
|
} /* switch (ch->chunk_type) */
|
|
|
|
|
|
|
|
|
|
|
|
next_chunk:
|
|
|
|
/* get the next chunk */
|
|
|
|
*offset += SCTP_SIZE32(chk_length);
|
|
|
|
if (*offset >= length) {
|
|
|
|
/* no more data left in the mbuf chain */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
|
|
|
|
sizeof(struct sctp_chunkhdr), chunk_buf);
|
|
|
|
if (ch == NULL) {
|
|
|
|
if (locked_tcb)
|
|
|
|
SCTP_TCB_UNLOCK(locked_tcb);
|
|
|
|
*offset = length;
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
} /* while */
|
|
|
|
return (stcb);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process the ECN bits we have something set so we must look to see if it is
|
|
|
|
* ECN(0) or ECN(1) or CE
|
|
|
|
*/
|
|
|
|
static __inline void
|
|
|
|
sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
|
|
uint8_t ecn_bits)
|
|
|
|
{
|
|
|
|
if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
|
|
|
|
;
|
|
|
|
} else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) {
|
|
|
|
/*
|
|
|
|
* we only add to the nonce sum for ECT1, ECT0 does not
|
|
|
|
* change the NS bit (that we have yet to find a way to send
|
|
|
|
* it yet).
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* ECN Nonce stuff */
|
|
|
|
stcb->asoc.receiver_nonce_sum++;
|
|
|
|
stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Drag up the last_echo point if cumack is larger since we
|
|
|
|
* don't want the point falling way behind by more than
|
|
|
|
* 2^^31 and then having it be incorrect.
|
|
|
|
*/
|
|
|
|
if (compare_with_wrap(stcb->asoc.cumulative_tsn,
|
|
|
|
stcb->asoc.last_echo_tsn, MAX_TSN)) {
|
|
|
|
stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
|
|
|
|
}
|
|
|
|
} else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) {
|
|
|
|
/*
|
|
|
|
* Drag up the last_echo point if cumack is larger since we
|
|
|
|
* don't want the point falling way behind by more than
|
|
|
|
* 2^^31 and then having it be incorrect.
|
|
|
|
*/
|
|
|
|
if (compare_with_wrap(stcb->asoc.cumulative_tsn,
|
|
|
|
stcb->asoc.last_echo_tsn, MAX_TSN)) {
|
|
|
|
stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static __inline void
|
|
|
|
sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
|
|
uint32_t high_tsn, uint8_t ecn_bits)
|
|
|
|
{
|
|
|
|
if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
|
|
|
|
/*
|
|
|
|
* we possibly must notify the sender that a congestion
|
|
|
|
* window reduction is in order. We do this by adding a ECNE
|
|
|
|
* chunk to the output chunk queue. The incoming CWR will
|
|
|
|
* remove this chunk.
|
|
|
|
*/
|
|
|
|
if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn,
|
|
|
|
MAX_TSN)) {
|
|
|
|
/* Yep, we need to add a ECNE */
|
|
|
|
sctp_send_ecn_echo(stcb, net, high_tsn);
|
|
|
|
stcb->asoc.last_echo_tsn = high_tsn;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* common input chunk processing (v4 and v6)
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
|
|
|
|
int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
|
|
|
|
struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
|
|
uint8_t ecn_bits)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Control chunk processing
|
|
|
|
*/
|
|
|
|
uint32_t high_tsn;
|
|
|
|
int fwd_tsn_seen = 0, data_processed = 0;
|
|
|
|
struct mbuf *m = *mm;
|
|
|
|
int abort_flag = 0;
|
|
|
|
int un_sent;
|
|
|
|
|
|
|
|
SCTP_STAT_INCR(sctps_recvdatagrams);
|
|
|
|
#ifdef SCTP_AUDITING_ENABLED
|
|
|
|
sctp_audit_log(0xE0, 1);
|
|
|
|
sctp_auditing(0, inp, stcb, net);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Ok, Common input processing called, m:%x iphlen:%d offset:%d\n",
|
|
|
|
(uint32_t) m, iphlen, offset);
|
|
|
|
}
|
|
|
|
#endif /* SCTP_DEBUG */
|
|
|
|
|
|
|
|
if (stcb) {
|
|
|
|
/* always clear this before beginning a packet */
|
|
|
|
stcb->asoc.authenticated = 0;
|
|
|
|
stcb->asoc.seen_a_sack_this_pkt = 0;
|
|
|
|
}
|
|
|
|
if (IS_SCTP_CONTROL(ch)) {
|
|
|
|
/* process the control portion of the SCTP packet */
|
|
|
|
stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
|
|
|
|
inp, stcb, &net, &fwd_tsn_seen);
|
|
|
|
if (stcb) {
|
|
|
|
/*
|
|
|
|
* This covers us if the cookie-echo was there and
|
|
|
|
* it changes our INP.
|
|
|
|
*/
|
|
|
|
inp = stcb->sctp_ep;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* no control chunks, so pre-process DATA chunks (these
|
|
|
|
* checks are taken care of by control processing)
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* if DATA only packet, and auth is required, then punt...
|
|
|
|
* can't have authenticated without any AUTH (control)
|
|
|
|
* chunks
|
|
|
|
*/
|
|
|
|
if ((stcb != NULL) && !sctp_auth_disable &&
|
|
|
|
sctp_auth_is_required_chunk(SCTP_DATA,
|
|
|
|
stcb->asoc.local_auth_chunks)) {
|
|
|
|
/* "silently" ignore */
|
|
|
|
SCTP_STAT_INCR(sctps_recvauthmissing);
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
if (stcb == NULL) {
|
|
|
|
/* out of the blue DATA chunk */
|
|
|
|
sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
|
|
|
|
/* v_tag mismatch! */
|
|
|
|
SCTP_STAT_INCR(sctps_badvtag);
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (stcb == NULL) {
|
|
|
|
/*
|
|
|
|
* no valid TCB for this packet, or we found it's a bad
|
|
|
|
* packet while processing control, or we're done with this
|
|
|
|
* packet (done or skip rest of data), so we drop it...
|
|
|
|
*/
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* DATA chunk processing
|
|
|
|
*/
|
|
|
|
/* plow through the data chunks while length > offset */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Rest should be DATA only. Check authentication state if AUTH for
|
|
|
|
* DATA is required.
|
|
|
|
*/
|
|
|
|
if ((stcb != NULL) && !sctp_auth_disable &&
|
|
|
|
sctp_auth_is_required_chunk(SCTP_DATA,
|
|
|
|
stcb->asoc.local_auth_chunks) &&
|
|
|
|
!stcb->asoc.authenticated) {
|
|
|
|
/* "silently" ignore */
|
|
|
|
SCTP_STAT_INCR(sctps_recvauthmissing);
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_AUTH1)
|
|
|
|
printf("Data chunk requires AUTH, skipped\n");
|
|
|
|
#endif
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
if (length > offset) {
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* First check to make sure our state is correct. We would
|
|
|
|
* not get here unless we really did have a tag, so we don't
|
|
|
|
* abort if this happens, just dump the chunk silently.
|
|
|
|
*/
|
|
|
|
switch (SCTP_GET_STATE(&stcb->asoc)) {
|
|
|
|
case SCTP_STATE_COOKIE_ECHOED:
|
|
|
|
/*
|
|
|
|
* we consider data with valid tags in this state
|
|
|
|
* shows us the cookie-ack was lost. Imply it was
|
|
|
|
* there.
|
|
|
|
*/
|
|
|
|
stcb->asoc.overall_error_count = 0;
|
|
|
|
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_COOKIE_WAIT:
|
|
|
|
/*
|
|
|
|
* We consider OOTB any data sent during asoc setup.
|
|
|
|
*/
|
|
|
|
sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL);
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return (1);
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_EMPTY: /* should not happen */
|
|
|
|
case SCTP_STATE_INUSE: /* should not happen */
|
|
|
|
case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
|
|
|
|
case SCTP_STATE_SHUTDOWN_ACK_SENT:
|
|
|
|
default:
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return (1);
|
|
|
|
break;
|
|
|
|
case SCTP_STATE_OPEN:
|
|
|
|
case SCTP_STATE_SHUTDOWN_SENT:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* take care of ECN, part 1. */
|
|
|
|
if (stcb->asoc.ecn_allowed &&
|
|
|
|
(ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
|
|
|
|
sctp_process_ecn_marked_a(stcb, net, ecn_bits);
|
|
|
|
}
|
|
|
|
/* plow through the data chunks while length > offset */
|
|
|
|
retval = sctp_process_data(mm, iphlen, &offset, length, sh,
|
|
|
|
inp, stcb, net, &high_tsn);
|
|
|
|
if (retval == 2) {
|
|
|
|
/*
|
|
|
|
* The association aborted, NO UNLOCK needed since
|
|
|
|
* the association is destroyed.
|
|
|
|
*/
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
data_processed = 1;
|
|
|
|
if (retval == 0) {
|
|
|
|
/* take care of ecn part 2. */
|
|
|
|
if (stcb->asoc.ecn_allowed &&
|
|
|
|
(ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
|
|
|
|
sctp_process_ecn_marked_b(stcb, net, high_tsn,
|
|
|
|
ecn_bits);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Anything important needs to have been m_copy'ed in
|
|
|
|
* process_data
|
|
|
|
*/
|
|
|
|
}
|
|
|
|
if ((data_processed == 0) && (fwd_tsn_seen)) {
|
|
|
|
int was_a_gap = 0;
|
|
|
|
|
|
|
|
if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
|
|
|
|
stcb->asoc.cumulative_tsn, MAX_TSN)) {
|
|
|
|
/* there was a gap before this data was processed */
|
|
|
|
was_a_gap = 1;
|
|
|
|
}
|
|
|
|
sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
|
|
|
|
if (abort_flag) {
|
|
|
|
/* Again, we aborted so NO UNLOCK needed */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* trigger send of any chunks in queue... */
|
|
|
|
#ifdef SCTP_AUDITING_ENABLED
|
|
|
|
sctp_audit_log(0xE0, 2);
|
|
|
|
sctp_auditing(1, inp, stcb, net);
|
|
|
|
#endif
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Check for chunk output prw:%d tqe:%d tf=%d\n",
|
|
|
|
stcb->asoc.peers_rwnd,
|
|
|
|
TAILQ_EMPTY(&stcb->asoc.control_send_queue),
|
|
|
|
stcb->asoc.total_flight);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
|
|
|
|
|
|
|
|
if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) ||
|
|
|
|
((un_sent) &&
|
|
|
|
(stcb->asoc.peers_rwnd > 0 ||
|
|
|
|
(stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("Calling chunk OUTPUT\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC);
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
|
|
|
|
printf("chunk OUTPUT returns\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
#ifdef SCTP_AUDITING_ENABLED
|
|
|
|
sctp_audit_log(0xE0, 3);
|
|
|
|
sctp_auditing(2, inp, stcb, net);
|
|
|
|
#endif
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
extern int sctp_no_csum_on_loopback;
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
sctp_input(m, off)
|
|
|
|
struct mbuf *m;
|
|
|
|
int off;
|
|
|
|
|
|
|
|
{
|
|
|
|
#ifdef SCTP_MBUF_LOGGING
|
|
|
|
struct mbuf *mat;
|
|
|
|
|
|
|
|
#endif
|
|
|
|
int iphlen;
|
|
|
|
int s;
|
|
|
|
uint8_t ecn_bits;
|
|
|
|
struct ip *ip;
|
|
|
|
struct sctphdr *sh;
|
|
|
|
struct sctp_inpcb *inp = NULL;
|
|
|
|
|
|
|
|
uint32_t check, calc_check;
|
|
|
|
struct sctp_nets *net;
|
|
|
|
struct sctp_tcb *stcb = NULL;
|
|
|
|
struct sctp_chunkhdr *ch;
|
|
|
|
int refcount_up = 0;
|
|
|
|
int length, mlen, offset;
|
|
|
|
|
|
|
|
|
|
|
|
iphlen = off;
|
|
|
|
net = NULL;
|
|
|
|
SCTP_STAT_INCR(sctps_recvpackets);
|
|
|
|
SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Strip IP options, we don't allow any in or out.
|
|
|
|
*/
|
|
|
|
#ifdef SCTP_MBUF_LOGGING
|
|
|
|
/* Log in any input mbufs */
|
|
|
|
mat = m;
|
|
|
|
while (mat) {
|
|
|
|
if (mat->m_flags & M_EXT) {
|
|
|
|
sctp_log_mb(mat, SCTP_MBUF_INPUT);
|
|
|
|
}
|
|
|
|
mat = mat->m_next;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if ((size_t)iphlen > sizeof(struct ip)) {
|
|
|
|
ip_stripoptions(m, (struct mbuf *)0);
|
|
|
|
iphlen = sizeof(struct ip);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Get IP, SCTP, and first chunk header together in first mbuf.
|
|
|
|
*/
|
|
|
|
ip = mtod(m, struct ip *);
|
|
|
|
offset = iphlen + sizeof(*sh) + sizeof(*ch);
|
|
|
|
if (m->m_len < offset) {
|
|
|
|
if ((m = m_pullup(m, offset)) == 0) {
|
|
|
|
SCTP_STAT_INCR(sctps_hdrops);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
ip = mtod(m, struct ip *);
|
|
|
|
}
|
|
|
|
sh = (struct sctphdr *)((caddr_t)ip + iphlen);
|
|
|
|
ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
|
|
|
|
|
|
|
|
/* SCTP does not allow broadcasts or multicasts */
|
|
|
|
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
if (((ch->chunk_type == SCTP_INITIATION) ||
|
|
|
|
(ch->chunk_type == SCTP_INITIATION_ACK) ||
|
|
|
|
(ch->chunk_type == SCTP_COOKIE_ECHO)) &&
|
|
|
|
(in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))) {
|
|
|
|
/*
|
|
|
|
* We only look at broadcast if its a front state, All
|
|
|
|
* others we will not have a tcb for anyway.
|
|
|
|
*/
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
/* destination port of 0 is illegal, based on RFC2960. */
|
|
|
|
if (sh->dest_port == 0) {
|
|
|
|
SCTP_STAT_INCR(sctps_hdrops);
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
/* validate SCTP checksum */
|
|
|
|
if ((sctp_no_csum_on_loopback == 0) ||
|
|
|
|
(m->m_pkthdr.rcvif == NULL) ||
|
|
|
|
(m->m_pkthdr.rcvif->if_type != IFT_LOOP)) {
|
|
|
|
/*
|
|
|
|
* we do NOT validate things from the loopback if the sysctl
|
|
|
|
* is set to 1.
|
|
|
|
*/
|
|
|
|
check = sh->checksum; /* save incoming checksum */
|
|
|
|
if ((check == 0) && (sctp_no_csum_on_loopback)) {
|
|
|
|
/*
|
|
|
|
* special hook for where we got a local address
|
|
|
|
* somehow routed across a non IFT_LOOP type
|
|
|
|
* interface
|
|
|
|
*/
|
|
|
|
if (ip->ip_src.s_addr == ip->ip_dst.s_addr)
|
|
|
|
goto sctp_skip_csum_4;
|
|
|
|
}
|
|
|
|
sh->checksum = 0; /* prepare for calc */
|
|
|
|
calc_check = sctp_calculate_sum(m, &mlen, iphlen);
|
|
|
|
if (calc_check != check) {
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Bad CSUM on SCTP packet calc_check:%x check:%x m:%x mlen:%d iphlen:%d\n",
|
|
|
|
calc_check, check, (uint32_t) m, mlen, iphlen);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
stcb = sctp_findassociation_addr(m, iphlen,
|
|
|
|
offset - sizeof(*ch),
|
|
|
|
sh, ch, &inp, &net);
|
|
|
|
if ((inp) && (stcb)) {
|
|
|
|
sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
|
|
|
|
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR);
|
|
|
|
} else if ((inp != NULL) && (stcb == NULL)) {
|
|
|
|
refcount_up = 1;
|
|
|
|
}
|
|
|
|
SCTP_STAT_INCR(sctps_badsum);
|
|
|
|
SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
sh->checksum = calc_check;
|
|
|
|
} else {
|
|
|
|
sctp_skip_csum_4:
|
|
|
|
mlen = m->m_pkthdr.len;
|
|
|
|
}
|
|
|
|
/* validate mbuf chain length with IP payload length */
|
|
|
|
if (mlen < (ip->ip_len - iphlen)) {
|
|
|
|
SCTP_STAT_INCR(sctps_hdrops);
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Locate pcb and tcb for datagram sctp_findassociation_addr() wants
|
|
|
|
* IP/SCTP/first chunk header...
|
|
|
|
*/
|
|
|
|
stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
|
|
|
|
sh, ch, &inp, &net);
|
|
|
|
/* inp's ref-count increased && stcb locked */
|
|
|
|
if (inp == NULL) {
|
|
|
|
struct sctp_init_chunk *init_chk, chunk_buf;
|
|
|
|
|
|
|
|
SCTP_STAT_INCR(sctps_noport);
|
|
|
|
#ifdef ICMP_BANDLIM
|
|
|
|
/*
|
|
|
|
* we use the bandwidth limiting to protect against sending
|
|
|
|
* too many ABORTS all at once. In this case these count the
|
|
|
|
* same as an ICMP message.
|
|
|
|
*/
|
|
|
|
if (badport_bandlim(0) < 0)
|
|
|
|
goto bad;
|
|
|
|
#endif /* ICMP_BANDLIM */
|
|
|
|
#ifdef SCTP_DEBUG
|
|
|
|
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
|
|
|
|
printf("Sending a ABORT from packet entry!\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (ch->chunk_type == SCTP_INITIATION) {
|
|
|
|
/*
|
|
|
|
* we do a trick here to get the INIT tag, dig in
|
|
|
|
* and get the tag from the INIT and put it in the
|
|
|
|
* common header.
|
|
|
|
*/
|
|
|
|
init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
|
|
|
|
iphlen + sizeof(*sh), sizeof(*init_chk),
|
|
|
|
(uint8_t *) & chunk_buf);
|
|
|
|
if (init_chk != NULL)
|
|
|
|
sh->v_tag = init_chk->init.initiate_tag;
|
|
|
|
}
|
|
|
|
sctp_send_abort(m, iphlen, sh, 0, NULL);
|
|
|
|
goto bad;
|
|
|
|
} else if (stcb == NULL) {
|
|
|
|
refcount_up = 1;
|
|
|
|
}
|
|
|
|
#ifdef IPSEC
|
|
|
|
/*
|
|
|
|
* I very much doubt any of the IPSEC stuff will work but I have no
|
|
|
|
* idea, so I will leave it in place.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (ipsec4_in_reject_so(m, inp->ip_inp.inp.inp_socket)) {
|
|
|
|
ipsecstat.in_polvio++;
|
|
|
|
SCTP_STAT_INCR(sctps_hdrops);
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
#endif /* IPSEC */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* common chunk processing
|
|
|
|
*/
|
|
|
|
length = ip->ip_len + iphlen;
|
|
|
|
offset -= sizeof(struct sctp_chunkhdr);
|
|
|
|
|
|
|
|
ecn_bits = ip->ip_tos;
|
|
|
|
s = splnet();
|
|
|
|
|
|
|
|
sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
|
|
|
|
inp, stcb, net, ecn_bits);
|
|
|
|
/* inp's ref-count reduced && stcb unlocked */
|
|
|
|
splx(s);
|
|
|
|
if (m) {
|
|
|
|
sctp_m_freem(m);
|
|
|
|
}
|
|
|
|
if ((inp) && (refcount_up)) {
|
|
|
|
/* reduce ref-count */
|
|
|
|
SCTP_INP_WLOCK(inp);
|
|
|
|
SCTP_INP_DECR_REF(inp);
|
|
|
|
SCTP_INP_WUNLOCK(inp);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
bad:
|
|
|
|
if (stcb)
|
|
|
|
SCTP_TCB_UNLOCK(stcb);
|
|
|
|
|
|
|
|
if ((inp) && (refcount_up)) {
|
|
|
|
/* reduce ref-count */
|
|
|
|
SCTP_INP_WLOCK(inp);
|
|
|
|
SCTP_INP_DECR_REF(inp);
|
|
|
|
SCTP_INP_WUNLOCK(inp);
|
|
|
|
}
|
|
|
|
if (m) {
|
|
|
|
sctp_m_freem(m);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|