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fedeb08b6a
freebsd-dev/sys/netinet/sctp_input.c
Michael Tuexen b15f541113 Improve the input validation and processing of cookies. 
This avoids setting the association in an inconsistent
state, which could result in a use-after-free situation.
This can be triggered by a malicious peer, if the peer
can modify the cookie without the local endpoint recognizing
it.
Thanks to Ned Williamson for reporting the issue.

MFC after:		3 days
2020-09-29 09:36:06 +00:00

5787 lines
181 KiB
C
Raw Blame History

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <netinet/sctp_os.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_crc32.h>
#include <netinet/sctp_kdtrace.h>
#if defined(INET) || defined(INET6)
#include <netinet/udp.h>
#endif
#include <sys/smp.h>
static void
sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
{
struct sctp_nets *net;
/*
* This now not only stops all cookie timers it also stops any INIT
* timers as well. This will make sure that the timers are stopped
* in all collision cases.
*/
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
stcb->sctp_ep,
stcb,
net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
} else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
stcb->sctp_ep,
stcb,
net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
}
}
}
/* INIT handler */
static void
sctp_handle_init(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id, uint16_t port)
{
struct sctp_init *init;
struct mbuf *op_err;
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
(void *)stcb);
if (stcb == NULL) {
SCTP_INP_RLOCK(inp);
}
/* validate length */
if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
/* validate parameters */
init = &cp->init;
if (init->initiate_tag == 0) {
/* protocol error... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
/* invalid parameter... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (init->num_inbound_streams == 0) {
/* protocol error... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (init->num_outbound_streams == 0) {
/* protocol error... send abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
offset + ntohs(cp->ch.chunk_length))) {
/* auth parameter(s) error... send abort */
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"Problem with AUTH parameters");
sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
if (stcb)
*abort_no_unlock = 1;
goto outnow;
}
/* We are only accepting if we have a listening socket. */
if ((stcb == NULL) &&
((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
(!SCTP_IS_LISTENING(inp)))) {
/*
* FIX ME ?? What about TCP model and we have a
* match/restart case? Actually no fix is needed. the lookup
* will always find the existing assoc so stcb would not be
* NULL. It may be questionable to do this since we COULD
* just send back the INIT-ACK and hope that the app did
* accept()'s by the time the COOKIE was sent. But there is
* a price to pay for COOKIE generation and I don't want to
* pay it on the chance that the app will actually do some
* accepts(). The App just looses and should NOT be in this
* state :-)
*/
if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"No listener");
sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
mflowtype, mflowid, inp->fibnum,
vrf_id, port);
}
goto outnow;
}
if ((stcb != NULL) &&
(SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
sctp_send_shutdown_ack(stcb, NULL);
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
} else {
SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
src, dst, sh, cp,
mflowtype, mflowid,
vrf_id, port);
}
outnow:
if (stcb == NULL) {
SCTP_INP_RUNLOCK(inp);
}
}
/*
* process peer "INIT/INIT-ACK" chunk returns value < 0 on error
*/
int
sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
{
int unsent_data;
unsigned int i;
struct sctp_stream_queue_pending *sp;
struct sctp_association *asoc;
/*
* This function returns if any stream has true unsent data on it.
* Note that as it looks through it will clean up any places that
* have old data that has been sent but left at top of stream queue.
*/
asoc = &stcb->asoc;
unsent_data = 0;
SCTP_TCB_SEND_LOCK(stcb);
if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
/* Check to see if some data queued */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
/* sa_ignore FREED_MEMORY */
sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
if (sp == NULL) {
continue;
}
if ((sp->msg_is_complete) &&
(sp->length == 0) &&
(sp->sender_all_done)) {
/*
* We are doing differed cleanup. Last time
* through when we took all the data the
* sender_all_done was not set.
*/
if (sp->put_last_out == 0) {
SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
sp->sender_all_done,
sp->length,
sp->msg_is_complete,
sp->put_last_out);
}
atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
if (sp->net) {
sctp_free_remote_addr(sp->net);
sp->net = NULL;
}
if (sp->data) {
sctp_m_freem(sp->data);
sp->data = NULL;
}
sctp_free_a_strmoq(stcb, sp, so_locked);
if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
unsent_data++;
}
} else {
unsent_data++;
}
if (unsent_data > 0) {
break;
}
}
}
SCTP_TCB_SEND_UNLOCK(stcb);
return (unsent_data);
}
static int
sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
{
struct sctp_init *init;
struct sctp_association *asoc;
struct sctp_nets *lnet;
unsigned int i;
init = &cp->init;
asoc = &stcb->asoc;
/* save off parameters */
asoc->peer_vtag = ntohl(init->initiate_tag);
asoc->peers_rwnd = ntohl(init->a_rwnd);
/* init tsn's */
asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
if (!TAILQ_EMPTY(&asoc->nets)) {
/* update any ssthresh's that may have a default */
TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
lnet->ssthresh = asoc->peers_rwnd;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
}
}
}
SCTP_TCB_SEND_LOCK(stcb);
if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
unsigned int newcnt;
struct sctp_stream_out *outs;
struct sctp_stream_queue_pending *sp, *nsp;
struct sctp_tmit_chunk *chk, *nchk;
/* abandon the upper streams */
newcnt = ntohs(init->num_inbound_streams);
TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
if (chk->rec.data.sid >= newcnt) {
TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
asoc->send_queue_cnt--;
if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
#ifdef INVARIANTS
} else {
panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
#endif
}
if (chk->data != NULL) {
sctp_free_bufspace(stcb, asoc, chk, 1);
sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
0, chk, SCTP_SO_NOT_LOCKED);
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
/* sa_ignore FREED_MEMORY */
}
}
if (asoc->strmout) {
for (i = newcnt; i < asoc->pre_open_streams; i++) {
outs = &asoc->strmout[i];
TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
TAILQ_REMOVE(&outs->outqueue, sp, next);
stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
stcb, 0, sp, SCTP_SO_NOT_LOCKED);
if (sp->data) {
sctp_m_freem(sp->data);
sp->data = NULL;
}
if (sp->net) {
sctp_free_remote_addr(sp->net);
sp->net = NULL;
}
/* Free the chunk */
sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
/* sa_ignore FREED_MEMORY */
}
outs->state = SCTP_STREAM_CLOSED;
}
}
/* cut back the count */
asoc->pre_open_streams = newcnt;
}
SCTP_TCB_SEND_UNLOCK(stcb);
asoc->streamoutcnt = asoc->pre_open_streams;
if (asoc->strmout) {
for (i = 0; i < asoc->streamoutcnt; i++) {
asoc->strmout[i].state = SCTP_STREAM_OPEN;
}
}
/* EY - nr_sack: initialize highest tsn in nr_mapping_array */
asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
/* This is the next one we expect */
asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
asoc->advanced_peer_ack_point = asoc->last_acked_seq;
/* open the requested streams */
if (asoc->strmin != NULL) {
/* Free the old ones */
for (i = 0; i < asoc->streamincnt; i++) {
sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
}
SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
}
if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
asoc->streamincnt = ntohs(init->num_outbound_streams);
} else {
asoc->streamincnt = asoc->max_inbound_streams;
}
SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
sizeof(struct sctp_stream_in), SCTP_M_STRMI);
if (asoc->strmin == NULL) {
/* we didn't get memory for the streams! */
SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
return (-1);
}
for (i = 0; i < asoc->streamincnt; i++) {
asoc->strmin[i].sid = i;
asoc->strmin[i].last_mid_delivered = 0xffffffff;
TAILQ_INIT(&asoc->strmin[i].inqueue);
TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
asoc->strmin[i].pd_api_started = 0;
asoc->strmin[i].delivery_started = 0;
}
/*
* load_address_from_init will put the addresses into the
* association when the COOKIE is processed or the INIT-ACK is
* processed. Both types of COOKIE's existing and new call this
* routine. It will remove addresses that are no longer in the
* association (for the restarting case where addresses are
* removed). Up front when the INIT arrives we will discard it if it
* is a restart and new addresses have been added.
*/
/* sa_ignore MEMLEAK */
return (0);
}
/*
* INIT-ACK message processing/consumption returns value < 0 on error
*/
static int
sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
struct sctp_nets *net, int *abort_no_unlock,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id)
{
struct sctp_association *asoc;
struct mbuf *op_err;
int retval, abort_flag, cookie_found;
int initack_limit;
int nat_friendly = 0;
/* First verify that we have no illegal param's */
abort_flag = 0;
cookie_found = 0;
op_err = sctp_arethere_unrecognized_parameters(m,
(offset + sizeof(struct sctp_init_chunk)),
&abort_flag, (struct sctp_chunkhdr *)cp,
&nat_friendly, &cookie_found);
if (abort_flag) {
/* Send an abort and notify peer */
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_no_unlock = 1;
return (-1);
}
if (!cookie_found) {
uint16_t len;
/* Only report the missing cookie parameter */
if (op_err != NULL) {
sctp_m_freem(op_err);
}
len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
/* We abort with an error of missing mandatory param */
op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
if (op_err != NULL) {
struct sctp_error_missing_param *cause;
SCTP_BUF_LEN(op_err) = len;
cause = mtod(op_err, struct sctp_error_missing_param *);
/* Subtract the reserved param */
cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
cause->cause.length = htons(len);
cause->num_missing_params = htonl(1);
cause->type[0] = htons(SCTP_STATE_COOKIE);
}
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-3);
}
asoc = &stcb->asoc;
asoc->peer_supports_nat = (uint8_t)nat_friendly;
/* process the peer's parameters in the INIT-ACK */
retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
if (retval < 0) {
if (op_err != NULL) {
sctp_m_freem(op_err);
}
return (retval);
}
initack_limit = offset + ntohs(cp->ch.chunk_length);
/* load all addresses */
if ((retval = sctp_load_addresses_from_init(stcb, m,
(offset + sizeof(struct sctp_init_chunk)), initack_limit,
src, dst, NULL, stcb->asoc.port))) {
if (op_err != NULL) {
sctp_m_freem(op_err);
}
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"Problem with address parameters");
SCTPDBG(SCTP_DEBUG_INPUT1,
"Load addresses from INIT causes an abort %d\n",
retval);
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
/* if the peer doesn't support asconf, flush the asconf queue */
if (asoc->asconf_supported == 0) {
struct sctp_asconf_addr *param, *nparam;
TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
TAILQ_REMOVE(&asoc->asconf_queue, param, next);
SCTP_FREE(param, SCTP_M_ASC_ADDR);
}
}
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... */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
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, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
/* calculate the RTO */
sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
SCTP_RTT_FROM_NON_DATA);
retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
return (retval);
}
static void
sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
union sctp_sockstore store;
struct sctp_nets *r_net, *f_net;
struct timeval tv;
int req_prim = 0;
uint16_t old_error_counter;
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
/* Invalid length */
return;
}
memset(&store, 0, sizeof(store));
switch (cp->heartbeat.hb_info.addr_family) {
#ifdef INET
case AF_INET:
if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
store.sin.sin_port = stcb->rport;
memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
sizeof(store.sin.sin_addr));
} else {
return;
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
store.sin6.sin6_port = stcb->rport;
memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
} else {
return;
}
break;
#endif
default:
return;
}
r_net = sctp_findnet(stcb, &store.sa);
if (r_net == NULL) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
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;
if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
stcb->asoc.primary_destination = r_net;
r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
f_net = TAILQ_FIRST(&stcb->asoc.nets);
if (f_net != r_net) {
/*
* first one on the list is NOT the primary
* sctp_cmpaddr() is much more efficient if
* the primary is the first on the list,
* make it so.
*/
TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
}
req_prim = 1;
}
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
old_error_counter = r_net->error_count;
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;
/* Now lets do a RTO with this */
sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
SCTP_RTT_FROM_NON_DATA);
if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
r_net->dest_state |= SCTP_ADDR_REACHABLE;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
0, (void *)r_net, SCTP_SO_NOT_LOCKED);
}
if (r_net->dest_state & SCTP_ADDR_PF) {
r_net->dest_state &= ~SCTP_ADDR_PF;
stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
}
if (old_error_counter > 0) {
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
}
if (r_net == stcb->asoc.primary_destination) {
if (stcb->asoc.alternate) {
/* release the alternate, primary is good */
sctp_free_remote_addr(stcb->asoc.alternate);
stcb->asoc.alternate = NULL;
}
}
/* Mobility adaptation */
if (req_prim) {
if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_BASE) ||
sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_FASTHANDOFF)) &&
sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_PRIM_DELETED)) {
sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
stcb->sctp_ep, stcb, NULL,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
if (sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_FASTHANDOFF)) {
sctp_assoc_immediate_retrans(stcb,
stcb->asoc.primary_destination);
}
if (sctp_is_mobility_feature_on(stcb->sctp_ep,
SCTP_MOBILITY_BASE)) {
sctp_move_chunks_from_net(stcb,
stcb->asoc.deleted_primary);
}
sctp_delete_prim_timer(stcb->sctp_ep, stcb);
}
}
}
static int
sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
{
/*
* Return 0 means we want you to proceed with the abort non-zero
* means no abort processing.
*/
uint32_t new_vtag;
struct sctpasochead *head;
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_INP_INFO_WLOCK();
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
} else {
return (0);
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
/* generate a new vtag and send init */
LIST_REMOVE(stcb, sctp_asocs);
stcb->asoc.my_vtag = new_vtag;
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
/*
* put it in the bucket in the vtag hash of assoc's for the
* system
*/
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
SCTP_INP_INFO_WUNLOCK();
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
return (1);
} else {
/*
* treat like a case where the cookie expired i.e.: - dump
* current cookie. - generate a new vtag. - resend init.
*/
/* generate a new vtag and send init */
LIST_REMOVE(stcb, sctp_asocs);
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
sctp_stop_all_cookie_timers(stcb);
sctp_toss_old_cookies(stcb, &stcb->asoc);
stcb->asoc.my_vtag = new_vtag;
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
/*
* put it in the bucket in the vtag hash of assoc's for the
* system
*/
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
SCTP_INP_INFO_WUNLOCK();
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
return (1);
}
return (0);
}
static int
sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
struct sctp_nets *net)
{
/*
* return 0 means we want you to proceed with the abort non-zero
* means no abort processing
*/
if (stcb->asoc.auth_supported == 0) {
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
return (0);
}
sctp_asconf_send_nat_state_update(stcb, net);
return (1);
}
/* Returns 1 if the stcb was aborted, 0 otherwise */
static int
sctp_handle_abort(struct sctp_abort_chunk *abort,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
uint16_t len;
uint16_t error;
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
if (stcb == NULL)
return (0);
len = ntohs(abort->ch.chunk_length);
if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
/*
* Need to check the cause codes for our two magic nat
* aborts which don't kill the assoc necessarily.
*/
struct sctp_error_cause *cause;
cause = (struct sctp_error_cause *)(abort + 1);
error = ntohs(cause->code);
if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
abort->ch.chunk_flags);
if (sctp_handle_nat_colliding_state(stcb)) {
return (0);
}
} else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
abort->ch.chunk_flags);
if (sctp_handle_nat_missing_state(stcb, net)) {
return (0);
}
}
} else {
error = 0;
}
/* stop any receive timers */
sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
/* notify user of the abort and clean up... */
sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
/* free the tcb */
SCTP_STAT_INCR_COUNTER32(sctps_aborted);
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
#ifdef SCTP_ASOCLOG_OF_TSNS
sctp_print_out_track_log(stcb);
#endif
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
return (1);
}
static void
sctp_start_net_timers(struct sctp_tcb *stcb)
{
uint32_t cnt_hb_sent;
struct sctp_nets *net;
cnt_hb_sent = 0;
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
/*
* For each network start: 1) A pmtu timer. 2) A HB timer 3)
* If the dest in unconfirmed send a hb as well if under
* max_hb_burst have been sent.
*/
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
(cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
cnt_hb_sent++;
}
}
if (cnt_hb_sent) {
sctp_chunk_output(stcb->sctp_ep, stcb,
SCTP_OUTPUT_FROM_COOKIE_ACK,
SCTP_SO_NOT_LOCKED);
}
}
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;
int old_state;
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown: handling SHUTDOWN\n");
if (stcb == NULL)
return;
asoc = &stcb->asoc;
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
return;
}
if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
/* Shutdown NOT the expected size */
return;
}
old_state = SCTP_GET_STATE(stcb);
sctp_update_acked(stcb, cp, abort_flag);
if (*abort_flag) {
return;
}
if (asoc->control_pdapi) {
/*
* With a normal shutdown we assume the end of last record.
*/
SCTP_INP_READ_LOCK(stcb->sctp_ep);
if (asoc->control_pdapi->on_strm_q) {
struct sctp_stream_in *strm;
strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
/* Unordered */
TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
asoc->control_pdapi->on_strm_q = 0;
} else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
/* Ordered */
TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
asoc->control_pdapi->on_strm_q = 0;
#ifdef INVARIANTS
} else {
panic("Unknown state on ctrl:%p on_strm_q:%d",
asoc->control_pdapi,
asoc->control_pdapi->on_strm_q);
#endif
}
}
asoc->control_pdapi->end_added = 1;
asoc->control_pdapi->pdapi_aborted = 1;
asoc->control_pdapi = NULL;
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
if (stcb->sctp_socket) {
sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}
}
/* goto SHUTDOWN_RECEIVED state to block new requests */
if (stcb->sctp_socket) {
if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
/*
* notify upper layer that peer has initiated a
* shutdown
*/
sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
/* reset time */
(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
}
}
if (SCTP_GET_STATE(stcb) == 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, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
}
/* Now is there unsent data on a stream somewhere? */
some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
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 */
/* move to SHUTDOWN-ACK-SENT state */
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
sctp_stop_timers_for_shutdown(stcb);
sctp_send_shutdown_ack(stcb, net);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
stcb->sctp_ep, stcb, net);
} else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
sctp_send_shutdown_ack(stcb, net);
}
}
}
static void
sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
struct sctp_tcb *stcb,
struct sctp_nets *net)
{
struct sctp_association *asoc;
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
if (stcb == NULL)
return;
asoc = &stcb->asoc;
/* process according to association state */
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
/* unexpected SHUTDOWN-ACK... do OOTB handling... */
sctp_send_shutdown_complete(stcb, net, 1);
SCTP_TCB_UNLOCK(stcb);
return;
}
if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
/* unexpected SHUTDOWN-ACK... so ignore... */
SCTP_TCB_UNLOCK(stcb);
return;
}
if (asoc->control_pdapi) {
/*
* With a normal shutdown we assume the end of last record.
*/
SCTP_INP_READ_LOCK(stcb->sctp_ep);
asoc->control_pdapi->end_added = 1;
asoc->control_pdapi->pdapi_aborted = 1;
asoc->control_pdapi = NULL;
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}
#ifdef INVARIANTS
if (!TAILQ_EMPTY(&asoc->send_queue) ||
!TAILQ_EMPTY(&asoc->sent_queue) ||
sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
panic("Queues are not empty when handling SHUTDOWN-ACK");
}
#endif
/* stop the timer */
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
/* send SHUTDOWN-COMPLETE */
sctp_send_shutdown_complete(stcb, net, 0);
/* notify upper layer protocol */
if (stcb->sctp_socket) {
if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
stcb->sctp_socket->so_snd.sb_cc = 0;
}
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
/* free the TCB but first save off the ep */
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
}
static void
sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
{
switch (chunk_type) {
case SCTP_ASCONF_ACK:
case SCTP_ASCONF:
sctp_asconf_cleanup(stcb);
break;
case SCTP_IFORWARD_CUM_TSN:
case SCTP_FORWARD_CUM_TSN:
stcb->asoc.prsctp_supported = 0;
break;
default:
SCTPDBG(SCTP_DEBUG_INPUT2,
"Peer does not support chunk type %d (0x%x).\n",
chunk_type, chunk_type);
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.
* XXX: Is this the right thing to do?
*/
static void
sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
{
switch (parameter_type) {
/* pr-sctp draft */
case SCTP_PRSCTP_SUPPORTED:
stcb->asoc.prsctp_supported = 0;
break;
case SCTP_SUPPORTED_CHUNK_EXT:
break;
/* draft-ietf-tsvwg-addip-sctp */
case SCTP_HAS_NAT_SUPPORT:
stcb->asoc.peer_supports_nat = 0;
break;
case SCTP_ADD_IP_ADDRESS:
case SCTP_DEL_IP_ADDRESS:
case SCTP_SET_PRIM_ADDR:
stcb->asoc.asconf_supported = 0;
break;
case SCTP_SUCCESS_REPORT:
case SCTP_ERROR_CAUSE_IND:
SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
SCTPDBG(SCTP_DEBUG_INPUT2,
"Turning off ASCONF to this strange peer\n");
stcb->asoc.asconf_supported = 0;
break;
default:
SCTPDBG(SCTP_DEBUG_INPUT2,
"Peer does not support param type %d (0x%x)??\n",
parameter_type, parameter_type);
break;
}
}
static int
sctp_handle_error(struct sctp_chunkhdr *ch,
struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
{
struct sctp_error_cause *cause;
struct sctp_association *asoc;
uint32_t remaining_length, adjust;
uint16_t code, cause_code, cause_length;
/* parse through all of the errors and process */
asoc = &stcb->asoc;
cause = (struct sctp_error_cause *)((caddr_t)ch +
sizeof(struct sctp_chunkhdr));
remaining_length = ntohs(ch->chunk_length);
if (remaining_length > limit) {
remaining_length = limit;
}
if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
remaining_length -= sizeof(struct sctp_chunkhdr);
} else {
remaining_length = 0;
}
code = 0;
while (remaining_length >= sizeof(struct sctp_error_cause)) {
/* Process an Error Cause */
cause_code = ntohs(cause->code);
cause_length = ntohs(cause->length);
if ((cause_length > remaining_length) || (cause_length == 0)) {
/* Invalid cause length, possibly due to truncation. */
SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
remaining_length, cause_length);
return (0);
}
if (code == 0) {
/* report the first error cause */
code = cause_code;
}
switch (cause_code) {
case SCTP_CAUSE_INVALID_STREAM:
case SCTP_CAUSE_MISSING_PARAM:
case SCTP_CAUSE_INVALID_PARAM:
case SCTP_CAUSE_NO_USER_DATA:
SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
cause_code);
break;
case SCTP_CAUSE_NAT_COLLIDING_STATE:
SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
ch->chunk_flags);
if (sctp_handle_nat_colliding_state(stcb)) {
return (0);
}
break;
case SCTP_CAUSE_NAT_MISSING_STATE:
SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
ch->chunk_flags);
if (sctp_handle_nat_missing_state(stcb, net)) {
return (0);
}
break;
case SCTP_CAUSE_STALE_COOKIE:
/*
* We only act if we have echoed a cookie and are
* waiting.
*/
if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
struct sctp_error_stale_cookie *stale_cookie;
stale_cookie = (struct sctp_error_stale_cookie *)cause;
asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
/* Double it to be more robust on RTX */
if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
asoc->cookie_preserve_req *= 2;
} else {
asoc->cookie_preserve_req = UINT32_MAX;
}
asoc->stale_cookie_count++;
if (asoc->stale_cookie_count >
asoc->max_init_times) {
sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
/* now free the asoc */
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
return (-1);
}
/* blast back to INIT state */
sctp_toss_old_cookies(stcb, &stcb->asoc);
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
sctp_stop_all_cookie_timers(stcb);
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
}
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 receive 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:
if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
struct sctp_error_unrecognized_chunk *unrec_chunk;
unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
}
break;
case SCTP_CAUSE_UNRECOG_PARAM:
/* XXX: We only consider the first parameter */
if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
struct sctp_paramhdr *unrec_parameter;
unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
}
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.
*/
SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
cause_code);
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
* should have came WITH an abort instead of in a
* OP-ERROR.
*/
break;
default:
SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
cause_code);
break;
}
adjust = SCTP_SIZE32(cause_length);
if (remaining_length >= adjust) {
remaining_length -= adjust;
} else {
remaining_length = 0;
}
cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
}
sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
return (0);
}
static int
sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
struct sctp_nets *net, int *abort_no_unlock,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id)
{
struct sctp_init_ack *init_ack;
struct mbuf *op_err;
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_init_ack: handling INIT-ACK\n");
if (stcb == NULL) {
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_init_ack: TCB is null\n");
return (-1);
}
if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
/* Invalid length */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
init_ack = &cp->init;
/* validate parameters */
if (init_ack->initiate_tag == 0) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
if (init_ack->num_inbound_streams == 0) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
if (init_ack->num_outbound_streams == 0) {
/* protocol error... send an abort */
op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, net->port);
*abort_no_unlock = 1;
return (-1);
}
/* process according to association state... */
switch (SCTP_GET_STATE(stcb)) {
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, SCTP_SO_NOT_LOCKED);
}
if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
net, abort_no_unlock,
mflowtype, mflowid,
vrf_id) < 0) {
/* error in parsing parameters */
return (-1);
}
/* update our state */
SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
/* reset the RTO calc */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
/*
* collapse the init timer back in case of a exponential
* backoff
*/
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;
}
SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
return (0);
}
static struct sctp_tcb *
sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
struct sockaddr *src, struct sockaddr *dst,
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,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id, uint16_t port);
/*
* 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 sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
struct sockaddr *init_src, int *notification,
int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id, uint16_t port)
{
struct sctp_association *asoc;
struct sctp_init_chunk *init_cp, init_buf;
struct sctp_init_ack_chunk *initack_cp, initack_buf;
struct sctp_nets *net;
struct mbuf *op_err;
struct timeval old;
int init_offset, initack_offset, i;
int retval;
int spec_flag = 0;
uint32_t how_indx;
#if defined(SCTP_DETAILED_STR_STATS)
int j;
#endif
net = *netp;
/* I know that the TCB is non-NULL from the caller */
asoc = &stcb->asoc;
for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
if (asoc->cookie_how[how_indx] == 0)
break;
}
if (how_indx < sizeof(asoc->cookie_how)) {
asoc->cookie_how[how_indx] = 1;
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
/* SHUTDOWN came in after sending INIT-ACK */
sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
mflowtype, mflowid, inp->fibnum,
vrf_id, net->port);
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 2;
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);
}
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(ntohs(init_cp->ch.chunk_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);
}
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
*/
if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
/*-
* Opps, this means that we somehow generated two vtag's
* the same. I.e. we did:
* Us Peer
* <---INIT(tag=a)------
* ----INIT-ACK(tag=t)-->
* ----INIT(tag=t)------> *1
* <---INIT-ACK(tag=a)---
* <----CE(tag=t)------------- *2
*
* At point *1 we should be generating a different
* tag t'. Which means we would throw away the CE and send
* ours instead. Basically this is case C (throw away side).
*/
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 17;
return (NULL);
}
switch (SCTP_GET_STATE(stcb)) {
case SCTP_STATE_COOKIE_WAIT:
case SCTP_STATE_COOKIE_ECHOED:
/*
* INIT was sent but got a COOKIE_ECHO with the
* correct tags... just accept it...but we must
* process the init so that we can make sure we have
* the right seq no's.
*/
/* First we must process the INIT !! */
retval = sctp_process_init(init_cp, stcb);
if (retval < 0) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 3;
return (NULL);
}
/* we have already processed the INIT so no problem */
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
/* update current state */
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
else
SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
sctp_stop_all_cookie_timers(stcb);
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
(!SCTP_IS_LISTENING(inp))) {
/*
* 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_socket);
}
/* notify upper layer */
*notification = SCTP_NOTIFY_ASSOC_UP;
/*
* since we did not send a HB make sure we don't
* double things
*/
old.tv_sec = cookie->time_entered.tv_sec;
old.tv_usec = cookie->time_entered.tv_usec;
net->hb_responded = 1;
sctp_calculate_rto(stcb, asoc, net, &old,
SCTP_RTT_FROM_NON_DATA);
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 */
sctp_stop_all_cookie_timers(stcb);
/*
* 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,
init_offset + sizeof(struct sctp_init_chunk),
initack_offset, src, dst, init_src, stcb->asoc.port)) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 4;
return (NULL);
}
/* respond with a COOKIE-ACK */
sctp_toss_old_cookies(stcb, asoc);
sctp_send_cookie_ack(stcb);
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 5;
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 == 0 &&
cookie->tie_tag_peer_vtag == 0) {
/*
* case C in Section 5.2.4 Table 2: XMOO silently discard
*/
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 6;
return (NULL);
}
/*
* If nat support, and the below and stcb is established, send back
* a ABORT(colliding state) if we are established.
*/
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
(asoc->peer_supports_nat) &&
((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
(asoc->peer_vtag == 0)))) {
/*
* Special case - Peer's support nat. We may have two init's
* that we gave out the same tag on since one was not
* established.. i.e. we get INIT from host-1 behind the nat
* and we respond tag-a, we get a INIT from host-2 behind
* the nat and we get tag-a again. Then we bring up host-1
* (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
* Now we have colliding state. We must send an abort here
* with colliding state indication.
*/
op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
mflowtype, mflowid, inp->fibnum,
vrf_id, port);
return (NULL);
}
if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
(asoc->peer_vtag == 0))) {
/*
* case B in Section 5.2.4 Table 2: MXAA or MOAA my info
* should be ok, re-accept peer info
*/
if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
/*
* Extension of case C. If we hit this, then the
* random number generator returned the same vtag
* when we first sent our INIT-ACK and when we later
* sent our INIT. The side with the seq numbers that
* are different will be the one that normnally
* would have hit case C. This in effect "extends"
* our vtags in this collision case to be 64 bits.
* The same collision could occur aka you get both
* vtag and seq number the same twice in a row.. but
* is much less likely. If it did happen then we
* would proceed through and bring up the assoc.. we
* may end up with the wrong stream setup however..
* which would be bad.. but there is no way to
* tell.. until we send on a stream that does not
* exist :-)
*/
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 7;
return (NULL);
}
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 8;
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
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);
if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
/*
* Ok the peer probably discarded our data (if we
* echoed a cookie+data). So anything on the
* sent_queue should be marked for retransmit, we
* may not get something to kick us so it COULD
* still take a timeout to move these.. but it can't
* hurt to mark them.
*/
struct sctp_tmit_chunk *chk;
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if (chk->sent < SCTP_DATAGRAM_RESEND) {
chk->sent = SCTP_DATAGRAM_RESEND;
sctp_flight_size_decrease(chk);
sctp_total_flight_decrease(stcb, chk);
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
spec_flag++;
}
}
}
/* process the INIT info (peer's info) */
retval = sctp_process_init(init_cp, stcb);
if (retval < 0) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 9;
return (NULL);
}
if (sctp_load_addresses_from_init(stcb, m,
init_offset + sizeof(struct sctp_init_chunk),
initack_offset, src, dst, init_src, stcb->asoc.port)) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 10;
return (NULL);
}
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(stcb) == 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)) &&
(!SCTP_IS_LISTENING(inp))) {
stcb->sctp_ep->sctp_flags |=
SCTP_PCB_FLAGS_CONNECTED;
soisconnected(stcb->sctp_socket);
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
else
SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
} else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
} else {
SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
}
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
sctp_stop_all_cookie_timers(stcb);
sctp_toss_old_cookies(stcb, asoc);
sctp_send_cookie_ack(stcb);
if (spec_flag) {
/*
* only if we have retrans set do we do this. What
* this call does is get only the COOKIE-ACK out and
* then when we return the normal call to
* sctp_chunk_output will get the retrans out behind
* this.
*/
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
}
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 11;
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;
if (asoc->peer_supports_nat) {
/*
* This is a gross gross hack. Just call the
* cookie_new code since we are allowing a duplicate
* association. I hope this works...
*/
return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
sh, cookie, cookie_len,
inp, netp, init_src, notification,
auth_skipped, auth_offset, auth_len,
mflowtype, mflowid,
vrf_id, port));
}
/*
* case A in Section 5.2.4 Table 2: XXMM (peer restarted)
*/
/* temp code */
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 12;
sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
/* notify upper layer */
*notification = SCTP_NOTIFY_ASSOC_RESTART;
atomic_add_int(&stcb->asoc.refcnt, 1);
if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
}
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
/* move to OPEN state, if not in SHUTDOWN_SENT */
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
}
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->asconf_seq_out_acked = asoc->asconf_seq_out - 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);
}
if (asoc->nr_mapping_array) {
memset(asoc->nr_mapping_array, 0,
asoc->mapping_array_size);
}
SCTP_TCB_UNLOCK(stcb);
SCTP_INP_INFO_WLOCK();
SCTP_INP_WLOCK(stcb->sctp_ep);
SCTP_TCB_LOCK(stcb);
atomic_add_int(&stcb->asoc.refcnt, -1);
/* send up all the data */
SCTP_TCB_SEND_LOCK(stcb);
sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
stcb->asoc.strmout[i].chunks_on_queues = 0;
#if defined(SCTP_DETAILED_STR_STATS)
for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
asoc->strmout[i].abandoned_sent[j] = 0;
asoc->strmout[i].abandoned_unsent[j] = 0;
}
#else
asoc->strmout[i].abandoned_sent[0] = 0;
asoc->strmout[i].abandoned_unsent[0] = 0;
#endif
stcb->asoc.strmout[i].sid = i;
stcb->asoc.strmout[i].next_mid_ordered = 0;
stcb->asoc.strmout[i].next_mid_unordered = 0;
stcb->asoc.strmout[i].last_msg_incomplete = 0;
}
/* 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 = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
SCTP_BASE_INFO(hashasocmark))];
/*
* put it in the bucket in the vtag hash of assoc's for the
* system
*/
LIST_INSERT_HEAD(head, stcb, sctp_asocs);
SCTP_TCB_SEND_UNLOCK(stcb);
SCTP_INP_WUNLOCK(stcb->sctp_ep);
SCTP_INP_INFO_WUNLOCK();
asoc->total_flight = 0;
asoc->total_flight_count = 0;
/* process the INIT info (peer's info) */
retval = sctp_process_init(init_cp, stcb);
if (retval < 0) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 13;
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,
init_offset + sizeof(struct sctp_init_chunk),
initack_offset, src, dst, init_src, stcb->asoc.port)) {
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 14;
return (NULL);
}
/* respond with a COOKIE-ACK */
sctp_stop_all_cookie_timers(stcb);
sctp_toss_old_cookies(stcb, asoc);
sctp_send_cookie_ack(stcb);
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 15;
return (stcb);
}
if (how_indx < sizeof(asoc->cookie_how))
asoc->cookie_how[how_indx] = 16;
/* 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 sockaddr *src, struct sockaddr *dst,
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,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id, uint16_t port)
{
struct sctp_tcb *stcb;
struct sctp_init_chunk *init_cp, init_buf;
struct sctp_init_ack_chunk *initack_cp, initack_buf;
union sctp_sockstore store;
struct sctp_association *asoc;
int init_offset, initack_offset, initack_limit;
int retval;
int error = 0;
uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
/*
* 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 */
SCTPDBG(SCTP_DEBUG_INPUT1,
"process_cookie_new: could not pull INIT chunk hdr\n");
return (NULL);
}
if (init_cp->ch.chunk_type != SCTP_INITIATION) {
SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
return (NULL);
}
initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_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 */
SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
return (NULL);
}
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
*/
/*
* Here we do a trick, we set in NULL for the proc/thread argument.
* We do this since in effect we only use the p argument when the
* socket is unbound and we must do an implicit bind. Since we are
* getting a cookie, we cannot be unbound.
*/
stcb = sctp_aloc_assoc(inp, init_src, &error,
ntohl(initack_cp->init.initiate_tag), vrf_id,
ntohs(initack_cp->init.num_outbound_streams),
port,
(struct thread *)NULL,
SCTP_DONT_INITIALIZE_AUTH_PARAMS);
if (stcb == NULL) {
struct mbuf *op_err;
/* memory problem? */
SCTPDBG(SCTP_DEBUG_INPUT1,
"process_cookie_new: no room for another TCB!\n");
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
return (NULL);
}
asoc = &stcb->asoc;
/* get scope variables out of cookie */
asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
asoc->scope.site_scope = cookie->site_scope;
asoc->scope.local_scope = cookie->local_scope;
asoc->scope.loopback_scope = cookie->loopback_scope;
if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
(asoc->scope.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_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
return (NULL);
}
/* 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);
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->asconf_seq_out_acked = asoc->asconf_seq_out - 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);
if (retval < 0) {
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
return (NULL);
}
/* load all addresses */
if (sctp_load_addresses_from_init(stcb, m,
init_offset + sizeof(struct sctp_init_chunk), initack_offset,
src, dst, init_src, port)) {
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
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;
if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
} else {
auth = NULL;
}
if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
/* auth HMAC failed, dump the assoc and packet */
SCTPDBG(SCTP_DEBUG_AUTH1,
"COOKIE-ECHO: AUTH failed\n");
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
return (NULL);
} else {
/* remaining chunks checked... good to go */
stcb->asoc.authenticated = 1;
}
}
/*
* 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) */
switch (cookie->laddr_type) {
#ifdef INET
case SCTP_IPV4_ADDRESS:
/* source addr is IPv4 */
memset(&store.sin, 0, sizeof(struct sockaddr_in));
store.sin.sin_family = AF_INET;
store.sin.sin_len = sizeof(struct sockaddr_in);
store.sin.sin_addr.s_addr = cookie->laddress[0];
break;
#endif
#ifdef INET6
case SCTP_IPV6_ADDRESS:
/* source addr is IPv6 */
memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
store.sin6.sin6_family = AF_INET6;
store.sin6.sin6_len = sizeof(struct sockaddr_in6);
store.sin6.sin6_scope_id = cookie->scope_id;
memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
break;
#endif
default:
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
return (NULL);
}
/* update current state */
SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
sctp_stop_all_cookie_timers(stcb);
SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
/* 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)) &&
(!SCTP_IS_LISTENING(inp))) {
/*
* 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_socket);
} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
(SCTP_IS_LISTENING(inp))) {
/*
* 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.
*/
;
}
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);
}
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
*netp = sctp_findnet(stcb, init_src);
if (*netp != NULL) {
struct timeval old;
/*
* Since we did not send a HB, make sure we don't double
* things.
*/
(*netp)->hb_responded = 1;
/* Calculate the RTT. */
old.tv_sec = cookie->time_entered.tv_sec;
old.tv_usec = cookie->time_entered.tv_usec;
sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
}
/* respond with a COOKIE-ACK */
sctp_send_cookie_ack(stcb);
/*
* check the address lists for any ASCONFs that need to be sent
* AFTER the cookie-ack is sent
*/
sctp_check_address_list(stcb, m,
initack_offset + sizeof(struct sctp_init_ack_chunk),
initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
&store.sa, cookie->local_scope, cookie->site_scope,
cookie->ipv4_scope, cookie->loopback_scope);
return (stcb);
}
/*
* CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
* we NEED to make sure we are not already using the vtag. If so we
* need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
SCTP_BASE_INFO(hashasocmark))];
LIST_FOREACH(stcb, head, sctp_asocs) {
if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
-- SEND ABORT - TRY AGAIN --
}
}
*/
/*
* 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 sockaddr *src, struct sockaddr *dst,
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_tcb **locked_tcb,
uint8_t mflowtype, uint32_t mflowid,
uint32_t vrf_id, uint16_t port)
{
struct sctp_state_cookie *cookie;
struct sctp_tcb *l_stcb = *stcb;
struct sctp_inpcb *l_inp;
struct sockaddr *to;
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 sig_offset, cookie_offset;
unsigned int cookie_len;
struct timeval now;
struct timeval time_expires;
int notification = 0;
struct sctp_nets *netl;
int had_a_existing_tcb = 0;
int send_int_conf = 0;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_cookie: handling COOKIE-ECHO\n");
if (inp_p == NULL) {
return (NULL);
}
cookie = &cp->cookie;
cookie_offset = offset + sizeof(struct sctp_chunkhdr);
cookie_len = ntohs(cp->ch.chunk_length);
if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
sizeof(struct sctp_init_chunk) +
sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
/* cookie too small */
return (NULL);
}
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 maintains the match even though it may be in the
* opposite byte order of the machine :->
*/
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;
m_sig = m_split(m, sig_offset, M_NOWAIT);
if (m_sig == NULL) {
/* out of memory or ?? */
return (NULL);
}
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
}
#endif
/*
* 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 */
(void)sctp_hmac_m(SCTP_HMAC,
(uint8_t *)ep->secret_key[(int)ep->last_secret_number],
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
} else {
/* it's the current cookie */
(void)sctp_hmac_m(SCTP_HMAC,
(uint8_t *)ep->secret_key[(int)ep->current_secret_number],
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
}
/* 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 */
sctp_m_freem(m_sig);
return (NULL);
}
/* compare the received digest with the computed digest */
if (timingsafe_bcmp(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 */
(void)sctp_hmac_m(SCTP_HMAC,
(uint8_t *)ep->secret_key[(int)ep->last_secret_number],
SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
/* compare */
if (timingsafe_bcmp(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 (SCTP_BUF_NEXT(m_at) != NULL) {
m_at = SCTP_BUF_NEXT(m_at);
}
SCTP_BUF_NEXT(m_at) = m_sig;
}
if (cookie_ok == 0) {
SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
SCTPDBG(SCTP_DEBUG_INPUT2,
"offset = %u, cookie_offset = %u, sig_offset = %u\n",
(uint32_t)offset, cookie_offset, sig_offset);
return (NULL);
}
/*
* check the cookie timestamps to be sure it's not stale
*/
(void)SCTP_GETTIME_TIMEVAL(&now);
/* Expire time is in Ticks, so we convert to seconds */
time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(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_error_stale_cookie *cause;
struct timeval diff;
uint32_t staleness;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
0, M_NOWAIT, 1, MT_DATA);
if (op_err == NULL) {
/* FOOBAR */
return (NULL);
}
/* Set the len */
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
cause = mtod(op_err, struct sctp_error_stale_cookie *);
cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
(sizeof(uint32_t))));
diff = now;
timevalsub(&diff, &time_expires);
if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
staleness = UINT32_MAX;
} else {
staleness = diff.tv_sec * 1000000;
}
if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
staleness += diff.tv_usec;
} else {
staleness = UINT32_MAX;
}
cause->stale_time = htonl(staleness);
sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
mflowtype, mflowid, l_inp->fibnum,
vrf_id, port);
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;
switch (cookie->addr_type) {
#ifdef INET6
case 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;
break;
#endif
#ifdef INET
case 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;
break;
#endif
default:
/* This should not happen */
return (NULL);
}
if (*stcb == NULL) {
/* Yep, lets check */
*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, 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) {
SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
}
} else {
if (*locked_tcb == NULL) {
/*
* In this case we found the assoc only
* after we locked the create lock. This
* means we are in a colliding case and we
* must make sure that we unlock the tcb if
* its one of the cases where we throw away
* the incoming packets.
*/
*locked_tcb = *stcb;
/*
* We must also increment the inp ref count
* since the ref_count flags was set when we
* did not find the TCB, now we found it
* which reduces the refcount.. we must
* raise it back out to balance it all :-)
*/
SCTP_INP_INCR_REF((*stcb)->sctp_ep);
if ((*stcb)->sctp_ep != l_inp) {
SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
(void *)(*stcb)->sctp_ep, (void *)l_inp);
}
}
}
}
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, src, dst, sh,
cookie, cookie_len, *inp_p,
netp, to, &notification,
auth_skipped, auth_offset, auth_len,
mflowtype, mflowid,
vrf_id, port);
} else {
/* this is abnormal... cookie-echo on existing TCB */
had_a_existing_tcb = 1;
*stcb = sctp_process_cookie_existing(m, iphlen, offset,
src, dst, sh,
cookie, cookie_len, *inp_p, *stcb, netp, to,
&notification, auth_skipped, auth_offset, auth_len,
mflowtype, mflowid,
vrf_id, port);
}
if (*stcb == NULL) {
/* still no TCB... must be bad cookie-echo */
return (NULL);
}
if (*netp != NULL) {
(*netp)->flowtype = mflowtype;
(*netp)->flowid = mflowid;
}
/*
* 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? */
if (sctp_add_remote_addr(*stcb, to, NULL, port,
SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
return (NULL);
}
netl = sctp_findnet(*stcb, to);
}
if (netl) {
if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
(void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
netl);
send_int_conf = 1;
}
}
sctp_start_net_timers(*stcb);
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, NULL, SCTP_SO_NOT_LOCKED);
if (send_int_conf) {
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
(*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
}
return (m);
}
oso = (*inp_p)->sctp_socket;
atomic_add_int(&(*stcb)->asoc.refcnt, 1);
SCTP_TCB_UNLOCK((*stcb));
CURVNET_SET(oso->so_vnet);
so = sonewconn(oso, 0
);
CURVNET_RESTORE();
SCTP_TCB_LOCK((*stcb));
atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
if (so == NULL) {
struct mbuf *op_err;
/* Too many sockets */
SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(*inp_p, NULL, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
(void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
return (NULL);
}
inp = (struct sctp_inpcb *)so->so_pcb;
SCTP_INP_INCR_REF(inp);
/*
* We add the unbound flag here so that if we get an
* soabort() before we get the move_pcb done, we
* will properly cleanup.
*/
inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
SCTP_PCB_FLAGS_CONNECTED |
SCTP_PCB_FLAGS_IN_TCPPOOL |
SCTP_PCB_FLAGS_UNBOUND |
(SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
SCTP_PCB_FLAGS_DONT_WAKE);
inp->sctp_features = (*inp_p)->sctp_features;
inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
inp->sctp_socket = so;
inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
inp->max_cwnd = (*inp_p)->max_cwnd;
inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
inp->ecn_supported = (*inp_p)->ecn_supported;
inp->prsctp_supported = (*inp_p)->prsctp_supported;
inp->auth_supported = (*inp_p)->auth_supported;
inp->asconf_supported = (*inp_p)->asconf_supported;
inp->reconfig_supported = (*inp_p)->reconfig_supported;
inp->nrsack_supported = (*inp_p)->nrsack_supported;
inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
inp->sctp_context = (*inp_p)->sctp_context;
inp->local_strreset_support = (*inp_p)->local_strreset_support;
inp->fibnum = (*inp_p)->fibnum;
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);
/*
* Now we must move it from one hash table to
* another and get the tcb in the right place.
*/
/*
* This is where the one-2-one socket is put into
* the accept state waiting for the accept!
*/
if (*stcb) {
SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
}
sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
atomic_add_int(&(*stcb)->asoc.refcnt, 1);
SCTP_TCB_UNLOCK((*stcb));
sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
0);
SCTP_TCB_LOCK((*stcb));
atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
/*
* now we must check to see if we were aborted while
* the move was going on and the lock/unlock
* happened.
*/
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/*
* yep it was, we leave the assoc attached
* to the socket since the sctp_inpcb_free()
* call will send an abort for us.
*/
SCTP_INP_DECR_REF(inp);
return (NULL);
}
SCTP_INP_DECR_REF(inp);
/* Switch over to the new guy */
*inp_p = inp;
sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
if (send_int_conf) {
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
(*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
}
/*
* Pull it from the incomplete queue and wake the
* guy
*/
soisconnected(so);
return (m);
}
}
if (notification) {
sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
if (send_int_conf) {
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
(*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
}
return (m);
}
static void
sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
/* cp must not be used, others call this without a c-ack :-) */
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_cookie_ack: handling COOKIE-ACK\n");
if ((stcb == NULL) || (net == NULL)) {
return;
}
asoc = &stcb->asoc;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
asoc->overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
asoc->overall_error_count = 0;
sctp_stop_all_cookie_timers(stcb);
/* process according to association state */
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
/* state change only needed when I am in right state */
SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
sctp_start_net_timers(stcb);
if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, NULL);
}
/* update RTO */
SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
SCTP_STAT_INCR_GAUGE32(sctps_currestab);
if (asoc->overall_error_count == 0) {
sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
SCTP_RTT_FROM_NON_DATA);
}
(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
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;
if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
soisconnected(stcb->sctp_socket);
}
}
/*
* since we did not send a HB make sure we don't double
* things
*/
net->hb_responded = 1;
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/*
* We don't need to do the asconf thing, nor hb or
* autoclose if the socket is closed.
*/
goto closed_socket;
}
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
stcb, net);
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);
}
/*
* send ASCONF if parameters are pending and ASCONFs are
* allowed (eg. addresses changed when init/cookie echo were
* in flight)
*/
if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
(stcb->asoc.asconf_supported == 1) &&
(!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
#ifdef SCTP_TIMER_BASED_ASCONF
sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
stcb->sctp_ep, stcb,
stcb->asoc.primary_destination);
#else
sctp_send_asconf(stcb, stcb->asoc.primary_destination,
SCTP_ADDR_NOT_LOCKED);
#endif
}
}
closed_socket:
/* Toss the cookie if I can */
sctp_toss_old_cookies(stcb, asoc);
/* Restart the timer if we have pending data */
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
if (chk->whoTo != NULL) {
break;
}
}
if (chk != NULL) {
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;
struct sctp_ecne_chunk bkup;
uint8_t override_bit;
uint32_t tsn, window_data_tsn;
int len;
unsigned int pkt_cnt;
len = ntohs(cp->ch.chunk_length);
if ((len != sizeof(struct sctp_ecne_chunk)) &&
(len != sizeof(struct old_sctp_ecne_chunk))) {
return;
}
if (len == sizeof(struct old_sctp_ecne_chunk)) {
/* Its the old format */
memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
bkup.num_pkts_since_cwr = htonl(1);
cp = &bkup;
}
SCTP_STAT_INCR(sctps_recvecne);
tsn = ntohl(cp->tsn);
pkt_cnt = ntohl(cp->num_pkts_since_cwr);
lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
if (lchk == NULL) {
window_data_tsn = stcb->asoc.sending_seq - 1;
} else {
window_data_tsn = lchk->rec.data.tsn;
}
/* Find where it was sent to if possible. */
net = NULL;
TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
if (lchk->rec.data.tsn == tsn) {
net = lchk->whoTo;
net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
break;
}
if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
break;
}
}
if (net == NULL) {
/*
* What to do. A previous send of a CWR was possibly lost.
* See how old it is, we may have it marked on the actual
* net.
*/
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if (tsn == net->last_cwr_tsn) {
/* Found him, send it off */
break;
}
}
if (net == NULL) {
/*
* If we reach here, we need to send a special CWR
* that says hey, we did this a long time ago and
* you lost the response.
*/
net = TAILQ_FIRST(&stcb->asoc.nets);
if (net == NULL) {
/* TSNH */
return;
}
override_bit = SCTP_CWR_REDUCE_OVERRIDE;
} else {
override_bit = 0;
}
} else {
override_bit = 0;
}
if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
/*
* JRS - Use the congestion control given in the pluggable
* CC module
*/
stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
/*
* We reduce once every RTT. So we will only lower cwnd at
* the next sending seq i.e. the window_data_tsn
*/
net->cwr_window_tsn = window_data_tsn;
net->ecn_ce_pkt_cnt += pkt_cnt;
net->lost_cnt = pkt_cnt;
net->last_cwr_tsn = tsn;
} else {
override_bit |= SCTP_CWR_IN_SAME_WINDOW;
if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
/*
* Another loss in the same window update how many
* marks/packets lost we have had.
*/
int cnt = 1;
if (pkt_cnt > net->lost_cnt) {
/* Should be the case */
cnt = (pkt_cnt - net->lost_cnt);
net->ecn_ce_pkt_cnt += cnt;
}
net->lost_cnt = pkt_cnt;
net->last_cwr_tsn = tsn;
/*
* Most CC functions will ignore this call, since we
* are in-window yet of the initial CE the peer saw.
*/
stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
}
}
/*
* 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. Note we set the override when we
* could not find the TSN on the chunk or the destination network.
*/
sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
}
static void
sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
{
/*
* Here we get a CWR from the peer. We must look in the outqueue and
* make sure that we have a covered ECNE in the control chunk part.
* If so remove it.
*/
struct sctp_tmit_chunk *chk, *nchk;
struct sctp_ecne_chunk *ecne;
int override;
uint32_t cwr_tsn;
cwr_tsn = ntohl(cp->tsn);
override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
continue;
}
if ((override == 0) && (chk->whoTo != net)) {
/* Must be from the right src unless override is set */
continue;
}
ecne = mtod(chk->data, struct sctp_ecne_chunk *);
if (SCTP_TSN_GE(cwr_tsn, ntohl(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);
stcb->asoc.ctrl_queue_cnt--;
sctp_m_freem(chk->data);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
if (override == 0) {
break;
}
}
}
}
static void
sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
struct sctp_tcb *stcb, struct sctp_nets *net)
{
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
if (stcb == NULL)
return;
/* process according to association state */
if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
/* unexpected SHUTDOWN-COMPLETE... so ignore... */
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
SCTP_TCB_UNLOCK(stcb);
return;
}
/* notify upper layer protocol */
if (stcb->sctp_socket) {
sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
#ifdef INVARIANTS
if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
!TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
}
#endif
/* stop the timer */
sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
/* free the TCB */
SCTPDBG(SCTP_DEBUG_INPUT2,
"sctp_handle_shutdown_complete: calls free-asoc\n");
(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
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:
case SCTP_IDATA:
/* find the tsn to resend (possibly) */
{
uint32_t tsn;
struct sctp_tmit_chunk *tp1;
tsn = ntohl(desc->tsn_ifany);
TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
if (tp1->rec.data.tsn == tsn) {
/* found it */
break;
}
if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
/* not found */
tp1 = NULL;
break;
}
}
if (tp1 == NULL) {
/*
* Do it the other way , aka without paying
* attention to queue seq order.
*/
SCTP_STAT_INCR(sctps_pdrpdnfnd);
TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
if (tp1->rec.data.tsn == tsn) {
/* found it */
break;
}
}
}
if (tp1 == NULL) {
SCTP_STAT_INCR(sctps_pdrptsnnf);
}
if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
if (((flg & SCTP_BADCRC) == 0) &&
((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
return (0);
}
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);
}
if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
/* Payload not matching. */
SCTP_STAT_INCR(sctps_pdrpbadd);
return (-1);
}
if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
/* Payload not matching. */
SCTP_STAT_INCR(sctps_pdrpbadd);
return (-1);
}
if (tp1->do_rtt) {
/*
* this guy had a RTO calculation
* pending on it, cancel it
*/
if (tp1->whoTo->rto_needed == 0) {
tp1->whoTo->rto_needed = 1;
}
tp1->do_rtt = 0;
}
SCTP_STAT_INCR(sctps_pdrpmark);
if (tp1->sent != SCTP_DATAGRAM_RESEND)
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
/*
* 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;
}
/* restart the timer */
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, tp1->whoTo,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, tp1->whoTo);
/* fix counts and things */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t)(uintptr_t)stcb,
tp1->rec.data.tsn);
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, tp1);
}
tp1->sent = SCTP_DATAGRAM_RESEND;
} {
/* 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) {
SCTP_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_FROM_SCTP_INPUT + SCTP_LOC_27);
sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
}
break;
case SCTP_SELECTIVE_ACK:
case SCTP_NR_SELECTIVE_ACK:
/* resend the sack */
sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
break;
case SCTP_HEARTBEAT_REQUEST:
/* resend a demand HB */
if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
/*
* Only retransmit if we KNOW we wont destroy the
* tcb
*/
sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
}
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);
break;
case SCTP_IFORWARD_CUM_TSN:
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, uint32_t number_entries, uint16_t *list)
{
uint32_t i;
uint16_t temp;
/*
* We set things to 0xffffffff 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_mid_delivered = 0xffffffff;
}
} else {
list = NULL;
for (i = 0; i < stcb->asoc.streamincnt; i++) {
stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
}
}
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
}
static void
sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
{
uint32_t i;
uint16_t temp;
if (number_entries > 0) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(list[i]);
if (temp >= stcb->asoc.streamoutcnt) {
/* no such stream */
continue;
}
stcb->asoc.strmout[temp].next_mid_ordered = 0;
stcb->asoc.strmout[temp].next_mid_unordered = 0;
}
} else {
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
stcb->asoc.strmout[i].next_mid_ordered = 0;
stcb->asoc.strmout[i].next_mid_unordered = 0;
}
}
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
}
static void
sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
{
uint32_t i;
uint16_t temp;
if (number_entries > 0) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(list[i]);
if (temp >= stcb->asoc.streamoutcnt) {
/* no such stream */
continue;
}
stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
}
} else {
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
}
}
}
struct sctp_stream_reset_request *
sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
{
struct sctp_association *asoc;
struct sctp_chunkhdr *ch;
struct sctp_stream_reset_request *r;
struct sctp_tmit_chunk *chk;
int len, clen;
asoc = &stcb->asoc;
if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
asoc->stream_reset_outstanding = 0;
return (NULL);
}
if (stcb->asoc.str_reset == NULL) {
asoc->stream_reset_outstanding = 0;
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;
ch = mtod(chk->data, struct sctp_chunkhdr *);
r = (struct sctp_stream_reset_request *)(ch + 1);
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_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;
struct sctp_tmit_chunk *chk;
asoc = &stcb->asoc;
chk = asoc->str_reset;
if (chk == NULL) {
return;
}
asoc->str_reset = NULL;
sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt--;
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
}
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 lparam_len;
struct sctp_association *asoc = &stcb->asoc;
struct sctp_tmit_chunk *chk;
struct sctp_stream_reset_request *req_param;
struct sctp_stream_reset_out_request *req_out_param;
struct sctp_stream_reset_in_request *req_in_param;
uint32_t number_entries;
if (asoc->stream_reset_outstanding == 0) {
/* duplicate */
return (0);
}
if (seq == stcb->asoc.str_reset_seq_out) {
req_param = sctp_find_stream_reset(stcb, seq, &chk);
if (req_param != NULL) {
stcb->asoc.str_reset_seq_out++;
type = ntohs(req_param->ph.param_type);
lparam_len = ntohs(req_param->ph.param_length);
if (type == SCTP_STR_RESET_OUT_REQUEST) {
int no_clear = 0;
req_out_param = (struct sctp_stream_reset_out_request *)req_param;
number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
asoc->stream_reset_out_is_outstanding = 0;
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
/* do it */
sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
} else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
/*
* Set it up so we don't stop
* retransmitting
*/
asoc->stream_reset_outstanding++;
stcb->asoc.str_reset_seq_out--;
asoc->stream_reset_out_is_outstanding = 1;
no_clear = 1;
} else {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
}
if (no_clear == 0) {
sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
}
} else if (type == SCTP_STR_RESET_IN_REQUEST) {
req_in_param = (struct sctp_stream_reset_in_request *)req_param;
number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
}
} else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
/* Ok we now may have more streams */
int num_stream;
num_stream = stcb->asoc.strm_pending_add_size;
if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
/* TSNH */
num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
}
stcb->asoc.strm_pending_add_size = 0;
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
/* Put the new streams into effect */
int i;
for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
asoc->strmout[i].state = SCTP_STREAM_OPEN;
}
asoc->streamoutcnt += num_stream;
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_DENIED);
} else {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_FAILED);
}
} else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
if (asoc->stream_reset_outstanding)
asoc->stream_reset_outstanding--;
if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_DENIED);
} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
SCTP_STREAM_CHANGE_FAILED);
}
} 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 (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
return (0);
}
if (action == SCTP_STREAM_RESET_RESULT_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, NULL, 0);
if (abort_flag) {
return (1);
}
stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
stcb->asoc.tsn_last_delivered = 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.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
memset(stcb->asoc.nr_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);
sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
SCTP_ASSOC_RESET_DENIED);
} else {
sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
SCTP_ASSOC_RESET_FAILED);
}
}
/* get rid of the request and get the request flags */
if (asoc->stream_reset_outstanding == 0) {
sctp_clean_up_stream_reset(stcb);
}
}
}
if (asoc->stream_reset_outstanding == 0) {
sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
}
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, int trunc)
{
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) {
asoc->last_reset_action[1] = asoc->last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (trunc) {
/* Can't do it, since they exceeded our buffer size */
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else 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));
if (number_entries) {
for (i = 0; i < number_entries; i++) {
temp = ntohs(req->list_of_streams[i]);
if (temp >= stcb->asoc.streamoutcnt) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
goto bad_boy;
}
req->list_of_streams[i] = temp;
}
for (i = 0; i < number_entries; i++) {
if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
}
}
} else {
/* Its all */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
}
}
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
} else {
/* Can't do it, since we have sent one out */
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
}
bad_boy:
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_RESULT_ERR_BAD_SEQNO);
}
sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
}
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) {
asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else {
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, NULL, 0);
if (abort_flag) {
return (1);
}
asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
memset(asoc->mapping_array, 0, asoc->mapping_array_size);
asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
atomic_add_int(&asoc->sending_seq, 1);
/* save off historical data for retrans */
asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
asoc->last_sending_seq[0] = asoc->sending_seq;
asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
}
sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
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],
asoc->last_sending_seq[0], 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],
asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
} else {
sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_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, int trunc)
{
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 (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (trunc) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
/* we can do it now */
sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_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, SCTP_M_STRESET);
if (liste == NULL) {
/* gak out of memory */
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
return;
}
liste->seq = seq;
liste->tsn = tsn;
liste->number_entries = number_entries;
memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
}
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) {
/*
* 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_RESULT_ERR_BAD_SEQNO);
}
}
static void
sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_add_strm *str_add)
{
/*
* Peer is requesting to add more streams. If its within our
* max-streams we will allow it.
*/
uint32_t num_stream, i;
uint32_t seq;
struct sctp_association *asoc = &stcb->asoc;
struct sctp_queued_to_read *ctl, *nctl;
/* Get the number. */
seq = ntohl(str_add->request_seq);
num_stream = ntohs(str_add->number_of_streams);
/* Now what would be the new total? */
if (asoc->str_reset_seq_in == seq) {
num_stream += stcb->asoc.streamincnt;
stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if ((num_stream > stcb->asoc.max_inbound_streams) ||
(num_stream > 0xffff)) {
/* We must reject it they ask for to many */
denied:
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else {
/* Ok, we can do that :-) */
struct sctp_stream_in *oldstrm;
/* save off the old */
oldstrm = stcb->asoc.strmin;
SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
(num_stream * sizeof(struct sctp_stream_in)),
SCTP_M_STRMI);
if (stcb->asoc.strmin == NULL) {
stcb->asoc.strmin = oldstrm;
goto denied;
}
/* copy off the old data */
for (i = 0; i < stcb->asoc.streamincnt; i++) {
TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
stcb->asoc.strmin[i].sid = i;
stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
/* now anything on those queues? */
TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
}
TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
}
}
/* Init the new streams */
for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
stcb->asoc.strmin[i].sid = i;
stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
stcb->asoc.strmin[i].pd_api_started = 0;
stcb->asoc.strmin[i].delivery_started = 0;
}
SCTP_FREE(oldstrm, SCTP_M_STRMI);
/* update the size */
stcb->asoc.streamincnt = num_stream;
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
}
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) {
/*
* 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_RESULT_ERR_BAD_SEQNO);
}
}
static void
sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
struct sctp_stream_reset_add_strm *str_add)
{
/*
* Peer is requesting to add more streams. If its within our
* max-streams we will allow it.
*/
uint16_t num_stream;
uint32_t seq;
struct sctp_association *asoc = &stcb->asoc;
/* Get the number. */
seq = ntohl(str_add->request_seq);
num_stream = ntohs(str_add->number_of_streams);
/* Now what would be the new total? */
if (asoc->str_reset_seq_in == seq) {
stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
} else if (stcb->asoc.stream_reset_outstanding) {
/* We must reject it we have something pending */
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
} else {
/* Ok, we can do that :-) */
int mychk;
mychk = stcb->asoc.streamoutcnt;
mychk += num_stream;
if (mychk < 0x10000) {
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
}
} else {
stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
}
}
sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
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_RESULT_ERR_BAD_SEQNO);
}
}
#ifdef __GNUC__
__attribute__((noinline))
#endif
static int
sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
struct sctp_chunkhdr *ch_req)
{
uint16_t remaining_length, param_len, ptype;
struct sctp_paramhdr pstore;
uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
uint32_t seq = 0;
int num_req = 0;
int trunc = 0;
struct sctp_tmit_chunk *chk;
struct sctp_chunkhdr *ch;
struct sctp_paramhdr *ph;
int ret_code = 0;
int num_param = 0;
/* now it may be a reset or a reset-response */
remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
/* setup for adding the response */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return (ret_code);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->no_fr_allowed = 0;
chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
chk->book_size_scale = 0;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 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, SCTP_SO_NOT_LOCKED);
return (ret_code);
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
/* setup chunk parameters */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = NULL;
ch = mtod(chk->data, struct sctp_chunkhdr *);
ch->chunk_type = SCTP_STREAM_RESET;
ch->chunk_flags = 0;
ch->chunk_length = htons(chk->send_size);
SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
offset += sizeof(struct sctp_chunkhdr);
while (remaining_length >= sizeof(struct sctp_paramhdr)) {
ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
if (ph == NULL) {
/* TSNH */
break;
}
param_len = ntohs(ph->param_length);
if ((param_len > remaining_length) ||
(param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
/* bad parameter length */
break;
}
ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
(uint8_t *)&cstore);
if (ph == NULL) {
/* TSNH */
break;
}
ptype = ntohs(ph->param_type);
num_param++;
if (param_len > sizeof(cstore)) {
trunc = 1;
} else {
trunc = 0;
}
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;
if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
break;
}
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 */
(void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
}
}
sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
} else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
struct sctp_stream_reset_add_strm *str_add;
if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
break;
}
str_add = (struct sctp_stream_reset_add_strm *)ph;
num_req++;
sctp_handle_str_reset_add_strm(stcb, chk, str_add);
} else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
struct sctp_stream_reset_add_strm *str_add;
if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
break;
}
str_add = (struct sctp_stream_reset_add_strm *)ph;
num_req++;
sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
} 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, trunc);
} 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;
if (param_len < sizeof(struct sctp_stream_reset_response)) {
break;
}
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;
}
offset += SCTP_SIZE32(param_len);
if (remaining_length >= SCTP_SIZE32(param_len)) {
remaining_length -= SCTP_SIZE32(param_len);
} else {
remaining_length = 0;
}
}
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 limit)
{
struct sctp_chunk_desc desc;
struct sctp_chunkhdr *chk_hdr;
struct sctp_data_chunk *data_chunk;
struct sctp_idata_chunk *idata_chunk;
uint32_t bottle_bw, on_queue;
uint32_t offset, chk_len;
uint16_t trunc_len;
uint16_t pktdrp_len;
uint8_t pktdrp_flags;
KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
("PKTDROP chunk too small"));
pktdrp_flags = cp->ch.chunk_flags;
pktdrp_len = ntohs(cp->ch.chunk_length);
KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
trunc_len = ntohs(cp->trunc_len);
if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
/* The peer plays games with us. */
return;
}
} else {
trunc_len = 0;
}
limit -= sizeof(struct sctp_pktdrop_chunk);
offset = 0;
if (offset == limit) {
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpbwrpt);
}
} else if (offset + sizeof(struct sctphdr) > limit) {
/* Only a partial SCTP common header. */
SCTP_STAT_INCR(sctps_pdrpcrupt);
offset = limit;
} else {
/* XXX: Check embedded SCTP common header. */
offset += sizeof(struct sctphdr);
}
/* Now parse through the chunks themselves. */
while (offset < limit) {
if (offset + sizeof(struct sctp_chunkhdr) > limit) {
SCTP_STAT_INCR(sctps_pdrpcrupt);
break;
}
chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
desc.chunk_type = chk_hdr->chunk_type;
/* get amount we need to move */
chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
if (chk_len < sizeof(struct sctp_chunkhdr)) {
/* Someone is lying... */
break;
}
if (desc.chunk_type == SCTP_DATA) {
if (stcb->asoc.idata_supported) {
/* Some is playing games with us. */
break;
}
if (chk_len <= sizeof(struct sctp_data_chunk)) {
/* Some is playing games with us. */
break;
}
if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
/*
* Not enough data bytes available in the
* chunk.
*/
SCTP_STAT_INCR(sctps_pdrpnedat);
goto next_chunk;
}
if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
/* Not enough data in buffer. */
break;
}
data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
desc.tsn_ifany = data_chunk->dp.tsn;
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpmbda);
}
} else if (desc.chunk_type == SCTP_IDATA) {
if (!stcb->asoc.idata_supported) {
/* Some is playing games with us. */
break;
}
if (chk_len <= sizeof(struct sctp_idata_chunk)) {
/* Some is playing games with us. */
break;
}
if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
/*
* Not enough data bytes available in the
* chunk.
*/
SCTP_STAT_INCR(sctps_pdrpnedat);
goto next_chunk;
}
if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
/* Not enough data in buffer. */
break;
}
idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
desc.tsn_ifany = idata_chunk->dp.tsn;
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpmbda);
}
} else {
if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
SCTP_STAT_INCR(sctps_pdrpmbct);
}
}
if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
SCTP_STAT_INCR(sctps_pdrppdbrk);
break;
}
next_chunk:
offset += SCTP_SIZE32(chk_len);
}
/* Now update any rwnd --- possibly */
if ((pktdrp_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 ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
(stcb->asoc.sat_t3_loss_recovery == 0) &&
(stcb->asoc.sat_network)) {
/*
* This is debatable 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.
*/
stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
net, cp, &bottle_bw, &on_queue);
}
}
/*
* 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
*/
#ifdef __GNUC__
__attribute__((noinline))
#endif
static struct sctp_tcb *
sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
uint32_t vrf_id, uint16_t port)
{
struct sctp_association *asoc;
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
uint32_t vtag_in;
int num_chunks = 0; /* number of control chunks processed */
uint32_t chk_length, contiguous;
int ret;
int abort_no_unlock = 0;
int ecne_seen = 0;
/*
* 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[SCTP_CHUNK_BUFFER_SIZE];
int got_auth = 0;
uint32_t auth_offset = 0, auth_len = 0;
int auth_skipped = 0;
int asconf_cnt = 0;
SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
iphlen, *offset, length, (void *)stcb);
if (stcb) {
SCTP_TCB_LOCK_ASSERT(stcb);
}
/* validate chunk header length... */
if (ntohs(ch->chunk_length) < sizeof(*ch)) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
ntohs(ch->chunk_length));
*offset = length;
return (stcb);
}
/*
* validate the verification tag
*/
vtag_in = ntohl(sh->v_tag);
if (ch->chunk_type == SCTP_INITIATION) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
ntohs(ch->chunk_length), vtag_in);
if (vtag_in != 0) {
/* protocol error- silently discard... */
SCTP_STAT_INCR(sctps_badvtag);
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
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) &&
(inp->auth_supported == 1)) {
/* 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 == NULL) {
/* Help */
*offset = length;
return (stcb);
}
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) {
struct sctp_chunkhdr *asconf_ch = ch;
uint32_t asconf_offset = 0, asconf_len = 0;
/* inp's refcount may be reduced */
SCTP_INP_INCR_REF(inp);
asconf_offset = *offset;
do {
asconf_len = ntohs(asconf_ch->chunk_length);
if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
break;
stcb = sctp_findassociation_ep_asconf(m,
*offset,
dst,
sh, &inp, netp, vrf_id);
if (stcb != NULL)
break;
asconf_offset += SCTP_SIZE32(asconf_len);
asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
sizeof(struct sctp_chunkhdr), chunk_buf);
} while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
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;
if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
got_auth = 1;
auth_skipped = 0;
} else {
auth = NULL;
}
if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
auth_offset)) {
/* auth HMAC failed so dump it */
*offset = length;
return (stcb);
} else {
/* remaining chunks are HMAC checked */
stcb->asoc.authenticated = 1;
}
}
}
if (stcb == NULL) {
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
/* no association, so it's out of the blue... */
sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
mflowtype, mflowid, inp->fibnum,
vrf_id, port);
*offset = length;
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)) {
/* Take the T-bit always into account. */
if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
(vtag_in == asoc->my_vtag)) ||
(((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
(asoc->peer_vtag != htonl(0)) &&
(vtag_in == asoc->peer_vtag))) {
/* this is valid */
} else {
/* drop this packet... */
SCTP_STAT_INCR(sctps_badvtag);
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
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 (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, *offset, src, dst,
sh, inp, op_err,
mflowtype, mflowid, fibnum,
vrf_id, port);
return (NULL);
}
} else {
/* for all other chunks, vtag must match */
if (vtag_in != asoc->my_vtag) {
/* invalid vtag... */
SCTPDBG(SCTP_DEBUG_INPUT3,
"invalid vtag: %xh, expect %xh\n",
vtag_in, asoc->my_vtag);
SCTP_STAT_INCR(sctps_badvtag);
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
*offset = length;
return (NULL);
}
}
} /* end if !SCTP_COOKIE_ECHO */
/*
* process all control chunks...
*/
if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
(ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
(ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
(SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
/* implied cookie-ack.. we must have lost the ack */
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);
SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
ch->chunk_type, chk_length);
SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
if (chk_length < sizeof(*ch) ||
(*offset + (int)chk_length) > length) {
*offset = length;
return (stcb);
}
SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
/*
* INIT and 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.
*/
switch (ch->chunk_type) {
case SCTP_INITIATION:
contiguous = sizeof(struct sctp_init_chunk);
break;
case SCTP_INITIATION_ACK:
contiguous = sizeof(struct sctp_init_ack_chunk);
break;
default:
contiguous = min(chk_length, sizeof(chunk_buf));
break;
}
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
contiguous,
chunk_buf);
if (ch == NULL) {
*offset = length;
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
}
num_chunks++;
/* Save off the last place we got a control from */
if (stcb != NULL) {
if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
/*
* allow last_control to be NULL if
* ASCONF... ASCONF processing will find the
* right net later
*/
if ((netp != NULL) && (*netp != NULL))
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_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:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
/* The INIT chunk must be the only chunk. */
if ((num_chunks > 1) ||
(length - *offset > (int)SCTP_SIZE32(chk_length))) {
/* RFC 4960 requires that no ABORT is sent */
*offset = length;
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
}
/* Honor our resource limit. */
if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
*offset = length;
return (NULL);
}
sctp_handle_init(m, iphlen, *offset, src, dst, sh,
(struct sctp_init_chunk *)ch, inp,
stcb, *netp, &abort_no_unlock,
mflowtype, mflowid,
vrf_id, port);
*offset = length;
if ((!abort_no_unlock) && (stcb != NULL)) {
SCTP_TCB_UNLOCK(stcb);
}
return (NULL);
break;
case SCTP_PAD_CHUNK:
break;
case SCTP_INITIATION_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
;
} else {
*offset = length;
if (stcb != NULL) {
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
}
return (NULL);
}
}
/* The INIT-ACK chunk must be the only chunk. */
if ((num_chunks > 1) ||
(length - *offset > (int)SCTP_SIZE32(chk_length))) {
*offset = length;
return (stcb);
}
if ((netp != NULL) && (*netp != NULL)) {
ret = sctp_handle_init_ack(m, iphlen, *offset,
src, dst, sh,
(struct sctp_init_ack_chunk *)ch,
stcb, *netp,
&abort_no_unlock,
mflowtype, mflowid,
vrf_id);
} else {
ret = -1;
}
*offset = length;
if (abort_no_unlock) {
return (NULL);
}
/*
* Special case, I must call the output routine to
* get the cookie echoed
*/
if ((stcb != NULL) && (ret == 0)) {
sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
}
return (stcb);
break;
case SCTP_SELECTIVE_ACK:
case SCTP_NR_SELECTIVE_ACK:
{
int abort_now = 0;
uint32_t a_rwnd, cum_ack;
uint16_t num_seg, num_nr_seg, num_dup;
uint8_t flags;
int offset_seg, offset_dup;
SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
SCTP_STAT_INCR(sctps_recvsacks);
if (stcb == NULL) {
SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
(ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
break;
}
if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
if (chk_length < sizeof(struct sctp_sack_chunk)) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
break;
}
} else {
if (stcb->asoc.nrsack_supported == 0) {
goto unknown_chunk;
}
if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
break;
}
}
if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
/*-
* If we have sent a shutdown-ack, we will pay no
* attention to a sack sent in to us since
* we don't care anymore.
*/
break;
}
flags = ch->chunk_flags;
if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
struct sctp_sack_chunk *sack;
sack = (struct sctp_sack_chunk *)ch;
cum_ack = ntohl(sack->sack.cum_tsn_ack);
num_seg = ntohs(sack->sack.num_gap_ack_blks);
num_nr_seg = 0;
num_dup = ntohs(sack->sack.num_dup_tsns);
a_rwnd = ntohl(sack->sack.a_rwnd);
if (sizeof(struct sctp_sack_chunk) +
num_seg * sizeof(struct sctp_gap_ack_block) +
num_dup * sizeof(uint32_t) != chk_length) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
break;
}
offset_seg = *offset + sizeof(struct sctp_sack_chunk);
offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
} else {
struct sctp_nr_sack_chunk *nr_sack;
nr_sack = (struct sctp_nr_sack_chunk *)ch;
cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
if (sizeof(struct sctp_nr_sack_chunk) +
(num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
num_dup * sizeof(uint32_t) != chk_length) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
break;
}
offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
}
SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
(ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
cum_ack, num_seg, a_rwnd);
stcb->asoc.seen_a_sack_this_pkt = 1;
if ((stcb->asoc.pr_sctp_cnt == 0) &&
(num_seg == 0) && (num_nr_seg == 0) &&
SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
(stcb->asoc.saw_sack_with_frags == 0) &&
(stcb->asoc.saw_sack_with_nr_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,
&abort_now, ecne_seen);
} else {
if ((netp != NULL) && (*netp != NULL)) {
sctp_handle_sack(m, offset_seg, offset_dup, stcb,
num_seg, num_nr_seg, num_dup, &abort_now, flags,
cum_ack, a_rwnd, ecne_seen);
}
}
if (abort_now) {
/* ABORT signal from sack processing */
*offset = length;
return (NULL);
}
if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
(stcb->asoc.stream_queue_cnt == 0)) {
sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
}
break;
}
case SCTP_HEARTBEAT_REQUEST:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
SCTP_STAT_INCR(sctps_recvheartbeat);
sctp_send_heartbeat_ack(stcb, m, *offset,
chk_length, *netp);
}
break;
case SCTP_HEARTBEAT_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
/* Its not ours */
*offset = length;
return (stcb);
}
SCTP_STAT_INCR(sctps_recvheartbeatack);
if ((netp != NULL) && (*netp != NULL)) {
sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
stcb, *netp);
}
break;
case SCTP_ABORT_ASSOCIATION:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
(void *)stcb);
*offset = length;
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
return (NULL);
} else {
return (stcb);
}
} else {
return (NULL);
}
break;
case SCTP_SHUTDOWN:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
(void *)stcb);
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
*offset = length;
return (stcb);
}
if ((netp != NULL) && (*netp != NULL)) {
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:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
}
*offset = length;
return (NULL);
break;
case SCTP_OPERATION_ERROR:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
*offset = length;
return (NULL);
}
break;
case SCTP_COOKIE_ECHO:
SCTPDBG(SCTP_DEBUG_INPUT3,
"SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
;
} else {
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
abend:
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
*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.
*
* XXXGL: notes on checking listen queue length.
* 1) SCTP_IS_LISTENING() doesn't necessarily mean
* SOLISTENING(), because a listening "UDP type"
* socket isn't listening in terms of the socket
* layer. It is a normal data flow socket, that
* can fork off new connections. Thus, we should
* look into sol_qlen only in case we are !UDP.
* 2) Checking sol_qlen in general requires locking
* the socket, and this code lacks that.
*/
if ((stcb == NULL) &&
(!SCTP_IS_LISTENING(inp) ||
(!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
(SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_association(inp, stcb, m, iphlen,
src, dst, sh, op_err,
mflowtype, mflowid,
vrf_id, port);
}
*offset = length;
return (NULL);
} else {
struct mbuf *ret_buf;
struct sctp_inpcb *linp;
struct sctp_tmit_chunk *chk;
if (stcb) {
linp = NULL;
} else {
linp = inp;
}
if (linp != NULL) {
SCTP_ASOC_CREATE_LOCK(linp);
if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
SCTP_ASOC_CREATE_UNLOCK(linp);
goto abend;
}
}
if (netp != NULL) {
struct sctp_tcb *locked_stcb;
locked_stcb = stcb;
ret_buf =
sctp_handle_cookie_echo(m, iphlen,
*offset,
src, dst,
sh,
(struct sctp_cookie_echo_chunk *)ch,
&inp, &stcb, netp,
auth_skipped,
auth_offset,
auth_len,
&locked_stcb,
mflowtype,
mflowid,
vrf_id,
port);
if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
SCTP_TCB_UNLOCK(locked_stcb);
}
if (stcb != NULL) {
SCTP_TCB_LOCK_ASSERT(stcb);
}
} else {
ret_buf = NULL;
}
if (linp != NULL) {
SCTP_ASOC_CREATE_UNLOCK(linp);
}
if (ret_buf == NULL) {
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
SCTPDBG(SCTP_DEBUG_INPUT3,
"GAK, null buffer\n");
*offset = length;
return (NULL);
}
/* if AUTH skipped, see if it verified... */
if (auth_skipped) {
got_auth = 1;
auth_skipped = 0;
}
/* Restart the timer if we have pending data */
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if (chk->whoTo != NULL) {
break;
}
}
if (chk != NULL) {
sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
}
}
break;
case SCTP_COOKIE_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
return (stcb);
}
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
if ((stcb) && (stcb->asoc.total_output_queue_size)) {
;
} else if (stcb) {
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
*offset = length;
return (NULL);
}
}
if ((netp != NULL) && (*netp != NULL)) {
sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
}
break;
case SCTP_ECN_ECHO:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (stcb->asoc.ecn_supported == 0) {
goto unknown_chunk;
}
sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
ecne_seen = 1;
break;
case SCTP_ECN_CWR:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
*offset = length;
return (stcb);
}
if (stcb->asoc.ecn_supported == 0) {
goto unknown_chunk;
}
sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
break;
case SCTP_SHUTDOWN_COMPLETE:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
/* must be first and only chunk */
if ((num_chunks > 1) ||
(length - *offset > (int)SCTP_SIZE32(chk_length))) {
*offset = length;
return (stcb);
}
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
stcb, *netp);
}
*offset = length;
return (NULL);
break;
case SCTP_ASCONF:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
if (stcb != NULL) {
if (stcb->asoc.asconf_supported == 0) {
goto unknown_chunk;
}
sctp_handle_asconf(m, *offset, src,
(struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
asconf_cnt++;
}
break;
case SCTP_ASCONF_ACK:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
/* Its not ours */
*offset = length;
return (stcb);
}
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
if (stcb->asoc.asconf_supported == 0) {
goto unknown_chunk;
}
/* He's alive so give him credit */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
stcb->asoc.overall_error_count,
0,
SCTP_FROM_SCTP_INPUT,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
sctp_handle_asconf_ack(m, *offset,
(struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
if (abort_no_unlock)
return (NULL);
}
break;
case SCTP_FORWARD_CUM_TSN:
case SCTP_IFORWARD_CUM_TSN:
SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (stcb != NULL) {
int abort_flag = 0;
if (stcb->asoc.prsctp_supported == 0) {
goto unknown_chunk;
}
if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
} else {
SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
}
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
*offset = length;
return (NULL);
}
*fwd_tsn_seen = 1;
if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
/* We are not interested anymore */
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
*offset = length;
return (NULL);
}
/*
* For sending a SACK this looks like DATA
* chunks.
*/
stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
sctp_handle_forward_tsn(stcb,
(struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
if (abort_flag) {
*offset = length;
return (NULL);
}
}
break;
case SCTP_STREAM_RESET:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (stcb->asoc.reconfig_supported == 0) {
goto unknown_chunk;
}
if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
/* stop processing */
*offset = length;
return (NULL);
}
break;
case SCTP_PACKET_DROPPED:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
/* re-get it all please */
if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
/* Its not ours */
*offset = length;
return (stcb);
}
if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
if (stcb->asoc.pktdrop_supported == 0) {
goto unknown_chunk;
}
sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
stcb, *netp,
min(chk_length, contiguous));
}
break;
case SCTP_AUTHENTICATION:
SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
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 (stcb->asoc.auth_supported == 0) {
goto unknown_chunk;
}
if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
(chk_length > (sizeof(struct sctp_auth_chunk) +
SCTP_AUTH_DIGEST_LEN_MAX))) {
/* Its not ours */
*offset = length;
return (stcb);
}
if (got_auth == 1) {
/* skip this chunk... it's already auth'd */
goto next_chunk;
}
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) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
(SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
struct sctp_gen_error_cause *cause;
int len;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
0, M_NOWAIT, 1, MT_DATA);
if (op_err != NULL) {
len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
cause = mtod(op_err, struct sctp_gen_error_cause *);
cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
if (SCTP_BUF_NEXT(op_err) != NULL) {
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
}
#endif
sctp_queue_op_err(stcb, op_err);
} else {
sctp_m_freem(op_err);
}
}
}
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) {
*offset = length;
return (stcb);
}
} /* while */
if ((asconf_cnt > 0) && (stcb != NULL)) {
sctp_send_asconf_ack(stcb);
}
return (stcb);
}
/*
* common input chunk processing (v4 and v6)
*/
void
sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
struct sockaddr *src, struct sockaddr *dst,
struct sctphdr *sh, struct sctp_chunkhdr *ch,
uint8_t compute_crc,
uint8_t ecn_bits,
uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
uint32_t vrf_id, uint16_t port)
{
uint32_t high_tsn;
int fwd_tsn_seen = 0, data_processed = 0;
struct mbuf *m = *mm, *op_err;
char msg[SCTP_DIAG_INFO_LEN];
int un_sent;
int cnt_ctrl_ready = 0;
struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
struct sctp_tcb *stcb = NULL;
struct sctp_nets *net = NULL;
SCTP_STAT_INCR(sctps_recvdatagrams);
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xE0, 1);
sctp_auditing(0, inp, stcb, net);
#endif
if (compute_crc != 0) {
uint32_t check, calc_check;
check = sh->checksum;
sh->checksum = 0;
calc_check = sctp_calculate_cksum(m, iphlen);
sh->checksum = check;
if (calc_check != check) {
SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
calc_check, check, (void *)m, length, iphlen);
stcb = sctp_findassociation_addr(m, offset, src, dst,
sh, ch, &inp, &net, vrf_id);
#if defined(INET) || defined(INET6)
if ((ch->chunk_type != SCTP_INITIATION) &&
(net != NULL) && (net->port != port)) {
if (net->port == 0) {
/* UDP encapsulation turned on. */
net->mtu -= sizeof(struct udphdr);
if (stcb->asoc.smallest_mtu > net->mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
} else if (port == 0) {
/* UDP encapsulation turned off. */
net->mtu += sizeof(struct udphdr);
/* XXX Update smallest_mtu */
}
net->port = port;
}
#endif
if (net != NULL) {
net->flowtype = mflowtype;
net->flowid = mflowid;
}
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
if ((inp != NULL) && (stcb != NULL)) {
sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
} else if ((inp != NULL) && (stcb == NULL)) {
inp_decr = inp;
}
SCTP_STAT_INCR(sctps_badsum);
SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
goto out;
}
}
/* Destination port of 0 is illegal, based on RFC4960. */
if (sh->dest_port == 0) {
SCTP_STAT_INCR(sctps_hdrops);
goto out;
}
stcb = sctp_findassociation_addr(m, offset, src, dst,
sh, ch, &inp, &net, vrf_id);
#if defined(INET) || defined(INET6)
if ((ch->chunk_type != SCTP_INITIATION) &&
(net != NULL) && (net->port != port)) {
if (net->port == 0) {
/* UDP encapsulation turned on. */
net->mtu -= sizeof(struct udphdr);
if (stcb->asoc.smallest_mtu > net->mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
} else if (port == 0) {
/* UDP encapsulation turned off. */
net->mtu += sizeof(struct udphdr);
/* XXX Update smallest_mtu */
}
net->port = port;
}
#endif
if (net != NULL) {
net->flowtype = mflowtype;
net->flowid = mflowid;
}
if (inp == NULL) {
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
SCTP_STAT_INCR(sctps_noport);
if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
goto out;
}
if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
sctp_send_shutdown_complete2(src, dst, sh,
mflowtype, mflowid, fibnum,
vrf_id, port);
goto out;
}
if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
goto out;
}
if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
(ch->chunk_type != SCTP_INIT))) {
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
"Out of the blue");
sctp_send_abort(m, iphlen, src, dst,
sh, 0, op_err,
mflowtype, mflowid, fibnum,
vrf_id, port);
}
}
goto out;
} else if (stcb == NULL) {
inp_decr = inp;
}
SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
(void *)m, iphlen, offset, length, (void *)stcb);
if (stcb) {
/* always clear this before beginning a packet */
stcb->asoc.authenticated = 0;
stcb->asoc.seen_a_sack_this_pkt = 0;
SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
(void *)stcb, stcb->asoc.state);
if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
(stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
/*-
* If we hit here, we had a ref count
* up when the assoc was aborted and the
* timer is clearing out the assoc, we should
* NOT respond to any packet.. its OOTB.
*/
SCTP_TCB_UNLOCK(stcb);
stcb = NULL;
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
mflowtype, mflowid, inp->fibnum,
vrf_id, port);
goto out;
}
}
if (IS_SCTP_CONTROL(ch)) {
/* process the control portion of the SCTP packet */
/* sa_ignore NO_NULL_CHK */
stcb = sctp_process_control(m, iphlen, &offset, length,
src, dst, sh, ch,
inp, stcb, &net, &fwd_tsn_seen,
mflowtype, mflowid, fibnum,
vrf_id, port);
if (stcb) {
/*
* This covers us if the cookie-echo was there and
* it changes our INP.
*/
inp = stcb->sctp_ep;
#if defined(INET) || defined(INET6)
if ((ch->chunk_type != SCTP_INITIATION) &&
(net != NULL) && (net->port != port)) {
if (net->port == 0) {
/* UDP encapsulation turned on. */
net->mtu -= sizeof(struct udphdr);
if (stcb->asoc.smallest_mtu > net->mtu) {
sctp_pathmtu_adjustment(stcb, net->mtu);
}
} else if (port == 0) {
/* UDP encapsulation turned off. */
net->mtu += sizeof(struct udphdr);
/* XXX Update smallest_mtu */
}
net->port = port;
}
#endif
}
} 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_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
/* "silently" ignore */
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
SCTP_STAT_INCR(sctps_recvauthmissing);
goto out;
}
if (stcb == NULL) {
/* out of the blue DATA chunk */
SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
mflowtype, mflowid, fibnum,
vrf_id, port);
goto out;
}
if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
/* v_tag mismatch! */
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
SCTP_STAT_INCR(sctps_badvtag);
goto out;
}
}
SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
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...
*/
goto out;
}
/*
* 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 ((length > offset) &&
(stcb != NULL) &&
sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
!stcb->asoc.authenticated) {
/* "silently" ignore */
SCTP_STAT_INCR(sctps_recvauthmissing);
SCTPDBG(SCTP_DEBUG_AUTH1,
"Data chunk requires AUTH, skipped\n");
goto trigger_send;
}
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)) {
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.
*/
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_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
msg);
sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
mflowtype, mflowid, inp->fibnum,
vrf_id, port);
goto out;
/* sa_ignore NOTREACHED */
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:
goto out;
/* sa_ignore NOTREACHED */
break;
case SCTP_STATE_OPEN:
case SCTP_STATE_SHUTDOWN_SENT:
break;
}
/* plow through the data chunks while length > offset */
retval = sctp_process_data(mm, iphlen, &offset, length,
inp, stcb, net, &high_tsn);
if (retval == 2) {
/*
* The association aborted, NO UNLOCK needed since
* the association is destroyed.
*/
stcb = NULL;
goto out;
}
data_processed = 1;
/*
* Anything important needs to have been m_copy'ed in
* process_data
*/
}
/* take care of ecn */
if ((data_processed == 1) &&
(stcb->asoc.ecn_supported == 1) &&
((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
/* Yep, we need to add a ECNE */
sctp_send_ecn_echo(stcb, net, high_tsn);
}
if ((data_processed == 0) && (fwd_tsn_seen)) {
int was_a_gap;
uint32_t highest_tsn;
if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
} else {
highest_tsn = stcb->asoc.highest_tsn_inside_map;
}
was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
stcb->asoc.send_sack = 1;
sctp_sack_check(stcb, was_a_gap);
} else if (fwd_tsn_seen) {
stcb->asoc.send_sack = 1;
}
/* trigger send of any chunks in queue... */
trigger_send:
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xE0, 2);
sctp_auditing(1, inp, stcb, net);
#endif
SCTPDBG(SCTP_DEBUG_INPUT1,
"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);
un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
}
if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
cnt_ctrl_ready ||
stcb->asoc.trigger_reset ||
((un_sent > 0) &&
(stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
}
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xE0, 3);
sctp_auditing(2, inp, stcb, net);
#endif
out:
if (stcb != NULL) {
SCTP_TCB_UNLOCK(stcb);
}
if (inp_decr != NULL) {
/* reduce ref-count */
SCTP_INP_WLOCK(inp_decr);
SCTP_INP_DECR_REF(inp_decr);
SCTP_INP_WUNLOCK(inp_decr);
}
return;
}
#ifdef INET
void
sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
{
struct mbuf *m;
int iphlen;
uint32_t vrf_id = 0;
uint8_t ecn_bits;
struct sockaddr_in src, dst;
struct ip *ip;
struct sctphdr *sh;
struct sctp_chunkhdr *ch;
int length, offset;
uint8_t compute_crc;
uint32_t mflowid;
uint8_t mflowtype;
uint16_t fibnum;
iphlen = off;
if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
SCTP_RELEASE_PKT(i_pak);
return;
}
m = SCTP_HEADER_TO_CHAIN(i_pak);
#ifdef SCTP_MBUF_LOGGING
/* Log in any input mbufs */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(m, SCTP_MBUF_INPUT);
}
#endif
#ifdef SCTP_PACKET_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
sctp_packet_log(m);
}
#endif
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
"sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
m->m_pkthdr.len,
if_name(m->m_pkthdr.rcvif),
(int)m->m_pkthdr.csum_flags, CSUM_BITS);
mflowid = m->m_pkthdr.flowid;
mflowtype = M_HASHTYPE_GET(m);
fibnum = M_GETFIB(m);
SCTP_STAT_INCR(sctps_recvpackets);
SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
/* Get IP, SCTP, and first chunk header together in the first mbuf. */
offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
if (SCTP_BUF_LEN(m) < offset) {
if ((m = m_pullup(m, offset)) == NULL) {
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(struct sctphdr));
offset -= sizeof(struct sctp_chunkhdr);
memset(&src, 0, sizeof(struct sockaddr_in));
src.sin_family = AF_INET;
src.sin_len = sizeof(struct sockaddr_in);
src.sin_port = sh->src_port;
src.sin_addr = ip->ip_src;
memset(&dst, 0, sizeof(struct sockaddr_in));
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
dst.sin_port = sh->dest_port;
dst.sin_addr = ip->ip_dst;
length = ntohs(ip->ip_len);
/* Validate mbuf chain length with IP payload length. */
if (SCTP_HEADER_LEN(m) != length) {
SCTPDBG(SCTP_DEBUG_INPUT1,
"sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
SCTP_STAT_INCR(sctps_hdrops);
goto out;
}
/* SCTP does not allow broadcasts or multicasts */
if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
goto out;
}
if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
goto out;
}
ecn_bits = ip->ip_tos;
if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
SCTP_STAT_INCR(sctps_recvhwcrc);
compute_crc = 0;
} else {
SCTP_STAT_INCR(sctps_recvswcrc);
compute_crc = 1;
}
sctp_common_input_processing(&m, iphlen, offset, length,
(struct sockaddr *)&src,
(struct sockaddr *)&dst,
sh, ch,
compute_crc,
ecn_bits,
mflowtype, mflowid, fibnum,
vrf_id, port);
out:
if (m) {
sctp_m_freem(m);
}
return;
}
#if defined(SCTP_MCORE_INPUT) && defined(SMP)
extern int *sctp_cpuarry;
#endif
int
sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
{
struct mbuf *m;
int off;
m = *mp;
off = *offp;
#if defined(SCTP_MCORE_INPUT) && defined(SMP)
if (mp_ncpus > 1) {
struct ip *ip;
struct sctphdr *sh;
int offset;
int cpu_to_use;
uint32_t flowid, tag;
if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
flowid = m->m_pkthdr.flowid;
} else {
/*
* No flow id built by lower layers fix it so we
* create one.
*/
offset = off + sizeof(struct sctphdr);
if (SCTP_BUF_LEN(m) < offset) {
if ((m = m_pullup(m, offset)) == NULL) {
SCTP_STAT_INCR(sctps_hdrops);
return (IPPROTO_DONE);
}
}
ip = mtod(m, struct ip *);
sh = (struct sctphdr *)((caddr_t)ip + off);
tag = htonl(sh->v_tag);
flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
m->m_pkthdr.flowid = flowid;
M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
}
cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
sctp_queue_to_mcore(m, off, cpu_to_use);
return (IPPROTO_DONE);
}
#endif
sctp_input_with_port(m, off, 0);
return (IPPROTO_DONE);
}
#endif
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