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freebsd-nq/sys/netinet/sctp_indata.c
Randall Stewart 44249214d3 This is work done by Michael Tuexen and myself at the IETF. This 
adds the new I-Data (Interleaved Data) message. This allows a user
to be able to have complete freedom from Head Of Line blocking that
was previously there due to the in-ability to send multiple large
messages without the TSN's being in sequence. The code as been
tested with Michaels various packet drill scripts as well as
inter-networking between the IETF's location in Argentina and Germany.
2016-04-07 09:10:34 +00:00

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/*-
* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <netinet/sctp_os.h>
#include <sys/proc.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_crc32.h>
#include <netinet/sctp_lock_bsd.h>
/*
* NOTES: On the outbound side of things I need to check the sack timer to
* see if I should generate a sack into the chunk queue (if I have data to
* send that is and will be sending it .. for bundling.
*
* The callback in sctp_usrreq.c will get called when the socket is read from.
* This will cause sctp_service_queues() to get called on the top entry in
* the list.
*/
static void
sctp_add_chk_to_control(struct sctp_queued_to_read *control,
struct sctp_stream_in *strm,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_tmit_chunk *chk);
void
sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc);
}
/* Calculate what the rwnd would be */
uint32_t
sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
uint32_t calc = 0;
/*
* This is really set wrong with respect to a 1-2-m socket. Since
* the sb_cc is the count that everyone as put up. When we re-write
* sctp_soreceive then we will fix this so that ONLY this
* associations data is taken into account.
*/
if (stcb->sctp_socket == NULL) {
return (calc);
}
if (stcb->asoc.sb_cc == 0 &&
asoc->size_on_reasm_queue == 0 &&
asoc->size_on_all_streams == 0) {
/* Full rwnd granted */
calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND);
return (calc);
}
/* get actual space */
calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
/*
* take out what has NOT been put on socket queue and we yet hold
* for putting up.
*/
calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_reasm_queue +
asoc->cnt_on_reasm_queue * MSIZE));
calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_all_streams +
asoc->cnt_on_all_streams * MSIZE));
if (calc == 0) {
/* out of space */
return (calc);
}
/* what is the overhead of all these rwnd's */
calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
/*
* If the window gets too small due to ctrl-stuff, reduce it to 1,
* even it is 0. SWS engaged
*/
if (calc < stcb->asoc.my_rwnd_control_len) {
calc = 1;
}
return (calc);
}
/*
* Build out our readq entry based on the incoming packet.
*/
struct sctp_queued_to_read *
sctp_build_readq_entry(struct sctp_tcb *stcb,
struct sctp_nets *net,
uint32_t tsn, uint32_t ppid,
uint32_t context, uint16_t stream_no,
uint32_t stream_seq, uint8_t flags,
struct mbuf *dm)
{
struct sctp_queued_to_read *read_queue_e = NULL;
sctp_alloc_a_readq(stcb, read_queue_e);
if (read_queue_e == NULL) {
goto failed_build;
}
memset(read_queue_e, 0, sizeof(struct sctp_queued_to_read));
read_queue_e->sinfo_stream = stream_no;
read_queue_e->sinfo_ssn = stream_seq;
read_queue_e->sinfo_flags = (flags << 8);
read_queue_e->sinfo_ppid = ppid;
read_queue_e->sinfo_context = context;
read_queue_e->sinfo_tsn = tsn;
read_queue_e->sinfo_cumtsn = tsn;
read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
read_queue_e->top_fsn = read_queue_e->fsn_included = 0xffffffff;
TAILQ_INIT(&read_queue_e->reasm);
read_queue_e->whoFrom = net;
atomic_add_int(&net->ref_count, 1);
read_queue_e->data = dm;
read_queue_e->stcb = stcb;
read_queue_e->port_from = stcb->rport;
failed_build:
return (read_queue_e);
}
struct mbuf *
sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo)
{
struct sctp_extrcvinfo *seinfo;
struct sctp_sndrcvinfo *outinfo;
struct sctp_rcvinfo *rcvinfo;
struct sctp_nxtinfo *nxtinfo;
struct cmsghdr *cmh;
struct mbuf *ret;
int len;
int use_extended;
int provide_nxt;
if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) &&
sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) {
/* user does not want any ancillary data */
return (NULL);
}
len = 0;
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
}
seinfo = (struct sctp_extrcvinfo *)sinfo;
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
(seinfo->serinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) {
provide_nxt = 1;
len += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
} else {
provide_nxt = 0;
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
use_extended = 1;
len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
} else {
use_extended = 0;
len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
}
} else {
use_extended = 0;
}
ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
if (ret == NULL) {
/* No space */
return (ret);
}
SCTP_BUF_LEN(ret) = 0;
/* We need a CMSG header followed by the struct */
cmh = mtod(ret, struct cmsghdr *);
/*
* Make sure that there is no un-initialized padding between the
* cmsg header and cmsg data and after the cmsg data.
*/
memset(cmh, 0, len);
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
cmh->cmsg_level = IPPROTO_SCTP;
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
cmh->cmsg_type = SCTP_RCVINFO;
rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
rcvinfo->rcv_sid = sinfo->sinfo_stream;
rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
rcvinfo->rcv_flags = sinfo->sinfo_flags;
rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
rcvinfo->rcv_context = sinfo->sinfo_context;
rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
}
if (provide_nxt) {
cmh->cmsg_level = IPPROTO_SCTP;
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
cmh->cmsg_type = SCTP_NXTINFO;
nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
nxtinfo->nxt_sid = seinfo->serinfo_next_stream;
nxtinfo->nxt_flags = 0;
if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
nxtinfo->nxt_flags |= SCTP_UNORDERED;
}
if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
}
if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
nxtinfo->nxt_flags |= SCTP_COMPLETE;
}
nxtinfo->nxt_ppid = seinfo->serinfo_next_ppid;
nxtinfo->nxt_length = seinfo->serinfo_next_length;
nxtinfo->nxt_assoc_id = seinfo->serinfo_next_aid;
cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
cmh->cmsg_level = IPPROTO_SCTP;
outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
if (use_extended) {
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
cmh->cmsg_type = SCTP_EXTRCV;
memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
} else {
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
cmh->cmsg_type = SCTP_SNDRCV;
*outinfo = *sinfo;
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
}
}
return (ret);
}
static void
sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
{
uint32_t gap, i, cumackp1;
int fnd = 0;
int in_r = 0, in_nr = 0;
if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
return;
}
cumackp1 = asoc->cumulative_tsn + 1;
if (SCTP_TSN_GT(cumackp1, tsn)) {
/*
* this tsn is behind the cum ack and thus we don't need to
* worry about it being moved from one to the other.
*/
return;
}
SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
in_r = SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap);
in_nr = SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap);
if ((in_r == 0) && (in_nr == 0)) {
#ifdef INVARIANTS
panic("Things are really messed up now");
#else
SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
sctp_print_mapping_array(asoc);
#endif
}
if (in_nr == 0)
SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
if (in_r)
SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
asoc->highest_tsn_inside_nr_map = tsn;
}
if (tsn == asoc->highest_tsn_inside_map) {
/* We must back down to see what the new highest is */
for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
asoc->highest_tsn_inside_map = i;
fnd = 1;
break;
}
}
if (!fnd) {
asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
}
}
}
static int
sctp_place_control_in_stream(struct sctp_stream_in *strm,
struct sctp_association *asoc,
struct sctp_queued_to_read *control)
{
struct sctp_queued_to_read *at;
struct sctp_readhead *q;
uint8_t bits, unordered;
bits = (control->sinfo_flags >> 8);
unordered = bits & SCTP_DATA_UNORDERED;
if (unordered) {
q = &strm->uno_inqueue;
if (asoc->idata_supported == 0) {
if (!TAILQ_EMPTY(q)) {
/*
* Only one stream can be here in old style
* -- abort
*/
return (-1);
}
TAILQ_INSERT_TAIL(q, control, next_instrm);
control->on_strm_q = SCTP_ON_UNORDERED;
return (0);
}
} else {
q = &strm->inqueue;
}
if ((bits & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
control->end_added = control->last_frag_seen = control->first_frag_seen = 1;
}
if (TAILQ_EMPTY(q)) {
/* Empty queue */
TAILQ_INSERT_HEAD(q, control, next_instrm);
if (unordered) {
control->on_strm_q = SCTP_ON_UNORDERED;
} else {
control->on_strm_q = SCTP_ON_ORDERED;
}
return (0);
} else {
TAILQ_FOREACH(at, q, next_instrm) {
if (SCTP_TSN_GT(at->msg_id, control->msg_id)) {
/*
* one in queue is bigger than the new one,
* insert before this one
*/
TAILQ_INSERT_BEFORE(at, control, next_instrm);
if (unordered) {
control->on_strm_q = SCTP_ON_UNORDERED;
} else {
control->on_strm_q = SCTP_ON_ORDERED;
}
break;
} else if (at->msg_id == control->msg_id) {
/*
* Gak, He sent me a duplicate msg id
* number?? return -1 to abort.
*/
return (-1);
} else {
if (TAILQ_NEXT(at, next_instrm) == NULL) {
/*
* We are at the end, insert it
* after this one
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, at,
SCTP_STR_LOG_FROM_INSERT_TL);
}
TAILQ_INSERT_AFTER(q,
at, control, next_instrm);
if (unordered) {
control->on_strm_q = SCTP_ON_UNORDERED;
} else {
control->on_strm_q = SCTP_ON_ORDERED;
}
break;
}
}
}
}
return (0);
}
static void
sctp_abort_in_reasm(struct sctp_tcb *stcb,
struct sctp_stream_in *strm,
struct sctp_queued_to_read *control,
struct sctp_tmit_chunk *chk,
int *abort_flag, int opspot)
{
char msg[SCTP_DIAG_INFO_LEN];
struct mbuf *oper;
if (stcb->asoc.idata_supported) {
snprintf(msg, sizeof(msg),
"Reass %x,CF:%x,TSN=%8.8x,SID=%4.4x,FSN=%8.8x,MID:%8.8x",
opspot,
control->fsn_included,
chk->rec.data.TSN_seq,
chk->rec.data.stream_number,
chk->rec.data.fsn_num, chk->rec.data.stream_seq);
} else {
snprintf(msg, sizeof(msg),
"Reass %x, CI:%x,TSN=%8.8x,SID=%4.4x,FSN=%4.4x, SSN:%4.4x",
opspot,
control->fsn_included,
chk->rec.data.TSN_seq,
chk->rec.data.stream_number,
chk->rec.data.fsn_num,
(uint16_t) chk->rec.data.stream_seq);
}
oper = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
sctp_m_freem(chk->data);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
}
static void
clean_up_control(struct sctp_tcb *stcb, struct sctp_queued_to_read *control)
{
/*
* The control could not be placed and must be cleaned.
*/
struct sctp_tmit_chunk *chk, *nchk;
TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
TAILQ_REMOVE(&control->reasm, chk, sctp_next);
if (chk->data)
sctp_m_freem(chk->data);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
}
sctp_free_a_readq(stcb, control);
}
/*
* Queue the chunk either right into the socket buffer if it is the next one
* to go OR put it in the correct place in the delivery queue. If we do
* append to the so_buf, keep doing so until we are out of order as
* long as the control's entered are non-fragmented.
*/
static void
sctp_queue_data_to_stream(struct sctp_tcb *stcb,
struct sctp_stream_in *strm,
struct sctp_association *asoc,
struct sctp_queued_to_read *control, int *abort_flag, int *need_reasm)
{
/*
* FIX-ME maybe? What happens when the ssn wraps? If we are getting
* all the data in one stream this could happen quite rapidly. One
* could use the TSN to keep track of things, but this scheme breaks
* down in the other type of stream useage that could occur. Send a
* single msg to stream 0, send 4Billion messages to stream 1, now
* send a message to stream 0. You have a situation where the TSN
* has wrapped but not in the stream. Is this worth worrying about
* or should we just change our queue sort at the bottom to be by
* TSN.
*
* Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
* with TSN 1? If the peer is doing some sort of funky TSN/SSN
* assignment this could happen... and I don't see how this would be
* a violation. So for now I am undecided an will leave the sort by
* SSN alone. Maybe a hybred approach is the answer
*
*/
struct sctp_queued_to_read *at;
int queue_needed;
uint32_t nxt_todel;
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
}
if (SCTP_MSGID_GT((!asoc->idata_supported), strm->last_sequence_delivered, control->sinfo_ssn)) {
/* The incoming sseq is behind where we last delivered? */
SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n",
control->sinfo_ssn, strm->last_sequence_delivered);
protocol_error:
/*
* throw it in the stream so it gets cleaned up in
* association destruction
*/
TAILQ_INSERT_HEAD(&strm->inqueue, control, next_instrm);
snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
strm->last_sequence_delivered, control->sinfo_tsn,
control->sinfo_stream, control->sinfo_ssn);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
return;
}
if ((SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) && (asoc->idata_supported == 0)) {
goto protocol_error;
}
queue_needed = 1;
asoc->size_on_all_streams += control->length;
sctp_ucount_incr(asoc->cnt_on_all_streams);
nxt_todel = strm->last_sequence_delivered + 1;
if (nxt_todel == control->sinfo_ssn) {
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
/* can be delivered right away? */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
}
/* EY it wont be queued if it could be delivered directly */
queue_needed = 0;
asoc->size_on_all_streams -= control->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
strm->last_sequence_delivered++;
sctp_mark_non_revokable(asoc, control->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
TAILQ_FOREACH_SAFE(control, &strm->inqueue, next_instrm, at) {
/* all delivered */
nxt_todel = strm->last_sequence_delivered + 1;
if ((nxt_todel == control->sinfo_ssn) &&
(((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG)) {
asoc->size_on_all_streams -= control->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
if (control->on_strm_q == SCTP_ON_ORDERED) {
TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
} else {
panic("Huh control:%p is on_strm_q:%d",
control, control->on_strm_q);
}
control->on_strm_q = 0;
strm->last_sequence_delivered++;
/*
* We ignore the return of deliver_data here
* since we always can hold the chunk on the
* d-queue. And we have a finite number that
* can be delivered from the strq.
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL,
SCTP_STR_LOG_FROM_IMMED_DEL);
}
sctp_mark_non_revokable(asoc, control->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1,
SCTP_READ_LOCK_NOT_HELD,
SCTP_SO_NOT_LOCKED);
continue;
} else if (nxt_todel == control->sinfo_ssn) {
*need_reasm = 1;
}
break;
}
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
if (queue_needed) {
/*
* Ok, we did not deliver this guy, find the correct place
* to put it on the queue.
*/
if (sctp_place_control_in_stream(strm, asoc, control)) {
char msg[SCTP_DIAG_INFO_LEN];
struct mbuf *oper;
snprintf(msg, sizeof(msg),
"Queue to str mid:%d duplicate",
control->msg_id);
clean_up_control(stcb, control);
oper = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
}
}
}
static void
sctp_setup_tail_pointer(struct sctp_queued_to_read *control)
{
struct mbuf *m, *prev = NULL;
struct sctp_tcb *stcb;
stcb = control->stcb;
control->held_length = 0;
control->length = 0;
m = control->data;
while (m) {
if (SCTP_BUF_LEN(m) == 0) {
/* Skip mbufs with NO length */
if (prev == NULL) {
/* First one */
control->data = sctp_m_free(m);
m = control->data;
} else {
SCTP_BUF_NEXT(prev) = sctp_m_free(m);
m = SCTP_BUF_NEXT(prev);
}
if (m == NULL) {
control->tail_mbuf = prev;
}
continue;
}
prev = m;
atomic_add_int(&control->length, SCTP_BUF_LEN(m));
if (control->on_read_q) {
/*
* On read queue so we must increment the SB stuff,
* we assume caller has done any locks of SB.
*/
sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
}
m = SCTP_BUF_NEXT(m);
}
if (prev) {
control->tail_mbuf = prev;
}
}
static void
sctp_add_to_tail_pointer(struct sctp_queued_to_read *control, struct mbuf *m)
{
struct mbuf *prev = NULL;
struct sctp_tcb *stcb;
stcb = control->stcb;
if (stcb == NULL) {
panic("Control broken");
}
if (control->tail_mbuf == NULL) {
/* TSNH */
control->data = m;
sctp_setup_tail_pointer(control);
return;
}
control->tail_mbuf->m_next = m;
while (m) {
if (SCTP_BUF_LEN(m) == 0) {
/* Skip mbufs with NO length */
if (prev == NULL) {
/* First one */
control->tail_mbuf->m_next = sctp_m_free(m);
m = control->tail_mbuf->m_next;
} else {
SCTP_BUF_NEXT(prev) = sctp_m_free(m);
m = SCTP_BUF_NEXT(prev);
}
if (m == NULL) {
control->tail_mbuf = prev;
}
continue;
}
prev = m;
if (control->on_read_q) {
/*
* On read queue so we must increment the SB stuff,
* we assume caller has done any locks of SB.
*/
sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
}
atomic_add_int(&control->length, SCTP_BUF_LEN(m));
m = SCTP_BUF_NEXT(m);
}
if (prev) {
control->tail_mbuf = prev;
}
}
static void
sctp_build_readq_entry_from_ctl(struct sctp_queued_to_read *nc, struct sctp_queued_to_read *control)
{
memset(nc, 0, sizeof(struct sctp_queued_to_read));
nc->sinfo_stream = control->sinfo_stream;
nc->sinfo_ssn = control->sinfo_ssn;
TAILQ_INIT(&nc->reasm);
nc->top_fsn = control->top_fsn;
nc->msg_id = control->msg_id;
nc->sinfo_flags = control->sinfo_flags;
nc->sinfo_ppid = control->sinfo_ppid;
nc->sinfo_context = control->sinfo_context;
nc->fsn_included = 0xffffffff;
nc->sinfo_tsn = control->sinfo_tsn;
nc->sinfo_cumtsn = control->sinfo_cumtsn;
nc->sinfo_assoc_id = control->sinfo_assoc_id;
nc->whoFrom = control->whoFrom;
atomic_add_int(&nc->whoFrom->ref_count, 1);
nc->stcb = control->stcb;
nc->port_from = control->port_from;
}
static int
sctp_handle_old_data(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_stream_in *strm,
struct sctp_queued_to_read *control, uint32_t pd_point)
{
/*
* Special handling for the old un-ordered data chunk. All the
* chunks/TSN's go to msg_id 0. So we have to do the old style
* watching to see if we have it all. If you return one, no other
* control entries on the un-ordered queue will be looked at. In
* theory there should be no others entries in reality, unless the
* guy is sending both unordered NDATA and unordered DATA...
*/
struct sctp_tmit_chunk *chk, *lchk, *tchk;
uint32_t fsn;
struct sctp_queued_to_read *nc = NULL;
int cnt_added;
if (control->first_frag_seen == 0) {
/* Nothing we can do, we have not seen the first piece yet */
return (1);
}
/* Collapse any we can */
cnt_added = 0;
restart:
fsn = control->fsn_included + 1;
/* Now what can we add? */
TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, lchk) {
if (chk->rec.data.fsn_num == fsn) {
/* Ok lets add it */
TAILQ_REMOVE(&control->reasm, chk, sctp_next);
sctp_add_chk_to_control(control, strm, stcb, asoc, chk);
fsn++;
cnt_added++;
chk = NULL;
if (control->end_added) {
/* We are done */
if (!TAILQ_EMPTY(&control->reasm)) {
/*
* Ok we have to move anything left
* on the control queue to a new
* control.
*/
sctp_alloc_a_readq(stcb, nc);
sctp_build_readq_entry_from_ctl(nc, control);
tchk = TAILQ_FIRST(&control->reasm);
if (tchk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
TAILQ_REMOVE(&control->reasm, tchk, sctp_next);
nc->first_frag_seen = 1;
nc->fsn_included = tchk->rec.data.fsn_num;
nc->data = tchk->data;
sctp_mark_non_revokable(asoc, tchk->rec.data.TSN_seq);
tchk->data = NULL;
sctp_free_a_chunk(stcb, tchk, SCTP_SO_NOT_LOCKED);
sctp_setup_tail_pointer(nc);
tchk = TAILQ_FIRST(&control->reasm);
}
/* Spin the rest onto the queue */
while (tchk) {
TAILQ_REMOVE(&control->reasm, tchk, sctp_next);
TAILQ_INSERT_TAIL(&nc->reasm, tchk, sctp_next);
tchk = TAILQ_FIRST(&control->reasm);
}
/*
* Now lets add it to the queue
* after removing control
*/
TAILQ_INSERT_TAIL(&strm->uno_inqueue, nc, next_instrm);
nc->on_strm_q = SCTP_ON_UNORDERED;
if (control->on_strm_q) {
TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
control->on_strm_q = 0;
}
}
if (control->on_read_q == 0) {
sctp_add_to_readq(stcb->sctp_ep, stcb, control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
}
if (control->pdapi_started) {
strm->pd_api_started = 0;
control->pdapi_started = 0;
}
if (control->on_strm_q) {
TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
control->on_strm_q = 0;
}
sctp_wakeup_the_read_socket(stcb->sctp_ep);
if ((nc) && (nc->first_frag_seen)) {
/*
* Switch to the new guy and
* continue
*/
control = nc;
nc = NULL;
goto restart;
}
return (1);
}
} else {
/* Can't add more */
break;
}
}
if ((control->length > pd_point) && (strm->pd_api_started == 0)) {
sctp_add_to_readq(stcb->sctp_ep, stcb, control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
strm->pd_api_started = 1;
control->pdapi_started = 1;
sctp_wakeup_the_read_socket(stcb->sctp_ep);
return (0);
} else {
return (1);
}
}
static void
sctp_inject_old_data_unordered(struct sctp_tcb *stcb, struct sctp_association *asoc,
struct sctp_stream_in *strm,
struct sctp_queued_to_read *control,
struct sctp_tmit_chunk *chk,
int *abort_flag)
{
struct sctp_tmit_chunk *at;
int inserted = 0;
/*
* Here we need to place the chunk into the control structure sorted
* in the correct order.
*/
if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
/* Its the very first one. */
SCTPDBG(SCTP_DEBUG_XXX,
"chunk is a first fsn:%d becomes fsn_included\n",
chk->rec.data.fsn_num);
if (control->first_frag_seen) {
/*
* In old un-ordered we can reassembly on one
* control multiple messages. As long as the next
* FIRST is greater then the old first (TSN i.e. FSN
* wise)
*/
struct mbuf *tdata;
uint32_t tmp;
if (SCTP_TSN_GT(chk->rec.data.fsn_num, control->fsn_included)) {
/*
* Easy way the start of a new guy beyond
* the lowest
*/
goto place_chunk;
}
if ((chk->rec.data.fsn_num == control->fsn_included) ||
(control->pdapi_started)) {
/*
* Ok this should not happen, if it does we
* started the pd-api on the higher TSN
* (since the equals part is a TSN failure
* it must be that).
*
* We are completly hosed in that case since I
* have no way to recover. This really will
* only happen if we can get more TSN's
* higher before the pd-api-point.
*/
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);
return;
}
/*
* Ok we have two firsts and the one we just got is
* smaller than the one we previously placed.. yuck!
* We must swap them out.
*/
/* swap the mbufs */
tdata = control->data;
control->data = chk->data;
chk->data = tdata;
/* Swap the lengths */
tmp = control->length;
control->length = chk->send_size;
chk->send_size = tmp;
/* Fix the FSN included */
tmp = control->fsn_included;
control->fsn_included = chk->rec.data.fsn_num;
chk->rec.data.fsn_num = tmp;
goto place_chunk;
}
control->first_frag_seen = 1;
control->top_fsn = control->fsn_included = chk->rec.data.fsn_num;
control->data = chk->data;
sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
sctp_setup_tail_pointer(control);
return;
}
place_chunk:
if (TAILQ_EMPTY(&control->reasm)) {
TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next);
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
return;
}
TAILQ_FOREACH(at, &control->reasm, sctp_next) {
if (SCTP_TSN_GT(at->rec.data.fsn_num, chk->rec.data.fsn_num)) {
/*
* This one in queue is bigger than the new one,
* insert the new one before at.
*/
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
inserted = 1;
TAILQ_INSERT_BEFORE(at, chk, sctp_next);
break;
} else if (at->rec.data.fsn_num == chk->rec.data.fsn_num) {
/*
* They sent a duplicate fsn number. This really
* should not happen since the FSN is a TSN and it
* should have been dropped earlier.
*/
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_5);
return;
}
}
if (inserted == 0) {
/* Its at the end */
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
control->top_fsn = chk->rec.data.fsn_num;
TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next);
}
}
static int
sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_stream_in *strm)
{
/*
* Given a stream, strm, see if any of the SSN's on it that are
* fragmented are ready to deliver. If so go ahead and place them on
* the read queue. In so placing if we have hit the end, then we
* need to remove them from the stream's queue.
*/
struct sctp_queued_to_read *control, *nctl = NULL;
uint32_t next_to_del;
uint32_t pd_point;
int ret = 0;
if (stcb->sctp_socket) {
pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
stcb->sctp_ep->partial_delivery_point);
} else {
pd_point = stcb->sctp_ep->partial_delivery_point;
}
control = TAILQ_FIRST(&strm->uno_inqueue);
if ((control) &&
(asoc->idata_supported == 0)) {
/* Special handling needed for "old" data format */
nctl = TAILQ_NEXT(control, next_instrm);
if (sctp_handle_old_data(stcb, asoc, strm, control, pd_point)) {
goto done_un;
}
}
if (strm->pd_api_started) {
/* Can't add more */
return (0);
}
while (control) {
SCTPDBG(SCTP_DEBUG_XXX, "Looking at control:%p e(%d) ssn:%d top_fsn:%d inc_fsn:%d -uo\n",
control, control->end_added, control->sinfo_ssn, control->top_fsn, control->fsn_included);
nctl = TAILQ_NEXT(control, next_instrm);
if (control->end_added) {
/* We just put the last bit on */
if (control->on_strm_q) {
if (control->on_strm_q != SCTP_ON_UNORDERED) {
panic("Huh control:%p on_q:%d -- not unordered?",
control, control->on_strm_q);
}
TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
control->on_strm_q = 0;
}
if (control->on_read_q == 0) {
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
}
} else {
/* Can we do a PD-API for this un-ordered guy? */
if ((control->length >= pd_point) && (strm->pd_api_started == 0)) {
strm->pd_api_started = 1;
control->pdapi_started = 1;
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
break;
}
}
control = nctl;
}
done_un:
control = TAILQ_FIRST(&strm->inqueue);
if (strm->pd_api_started) {
/* Can't add more */
return (0);
}
if (control == NULL) {
return (ret);
}
if (strm->last_sequence_delivered == control->sinfo_ssn) {
/*
* Ok the guy at the top was being partially delivered
* completed, so we remove it. Note the pd_api flag was
* taken off when the chunk was merged on in
* sctp_queue_data_for_reasm below.
*/
nctl = TAILQ_NEXT(control, next_instrm);
SCTPDBG(SCTP_DEBUG_XXX,
"Looking at control:%p e(%d) ssn:%d top_fsn:%d inc_fsn:%d (lastdel:%d)- o\n",
control, control->end_added, control->sinfo_ssn,
control->top_fsn, control->fsn_included,
strm->last_sequence_delivered);
if (control->end_added) {
if (control->on_strm_q) {
if (control->on_strm_q != SCTP_ON_ORDERED) {
panic("Huh control:%p on_q:%d -- not ordered?",
control, control->on_strm_q);
}
TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
control->on_strm_q = 0;
}
if (control->on_read_q == 0) {
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
}
if (strm->pd_api_started && control->pdapi_started) {
control->pdapi_started = 0;
strm->pd_api_started = 0;
}
control = nctl;
}
}
if (strm->pd_api_started) {
/*
* Can't add more must have gotten an un-ordered above being
* partially delivered.
*/
return (0);
}
deliver_more:
next_to_del = strm->last_sequence_delivered + 1;
if (control) {
SCTPDBG(SCTP_DEBUG_XXX,
"Looking at control:%p e(%d) ssn:%d top_fsn:%d inc_fsn:%d (nxtdel:%d)- o\n",
control, control->end_added, control->sinfo_ssn, control->top_fsn, control->fsn_included,
next_to_del);
nctl = TAILQ_NEXT(control, next_instrm);
if ((control->sinfo_ssn == next_to_del) &&
(control->first_frag_seen)) {
/* Ok we can deliver it onto the stream. */
if (control->end_added) {
/* We are done with it afterwards */
if (control->on_strm_q) {
if (control->on_strm_q != SCTP_ON_ORDERED) {
panic("Huh control:%p on_q:%d -- not ordered?",
control, control->on_strm_q);
}
TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
control->on_strm_q = 0;
}
ret++;
}
if (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
/*
* A singleton now slipping through - mark
* it non-revokable too
*/
sctp_mark_non_revokable(asoc, control->sinfo_tsn);
} else if (control->end_added == 0) {
/*
* Check if we can defer adding until its
* all there
*/
if ((control->length < pd_point) || (strm->pd_api_started)) {
/*
* Don't need it or cannot add more
* (one being delivered that way)
*/
goto out;
}
}
if (control->on_read_q == 0) {
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
}
strm->last_sequence_delivered = next_to_del;
if ((control->end_added) && (control->last_frag_seen)) {
control = nctl;
goto deliver_more;
} else {
/* We are now doing PD API */
strm->pd_api_started = 1;
control->pdapi_started = 1;
}
}
}
out:
return (ret);
}
void
sctp_add_chk_to_control(struct sctp_queued_to_read *control,
struct sctp_stream_in *strm,
struct sctp_tcb *stcb, struct sctp_association *asoc,
struct sctp_tmit_chunk *chk)
{
/*
* Given a control and a chunk, merge the data from the chk onto the
* control and free up the chunk resources.
*/
int i_locked = 0;
if (control->on_read_q) {
/*
* Its being pd-api'd so we must do some locks.
*/
SCTP_INP_READ_LOCK(stcb->sctp_ep);
i_locked = 1;
}
if (control->data == NULL) {
control->data = chk->data;
sctp_setup_tail_pointer(control);
} else {
sctp_add_to_tail_pointer(control, chk->data);
}
control->fsn_included = chk->rec.data.fsn_num;
asoc->size_on_reasm_queue -= chk->send_size;
sctp_ucount_decr(asoc->cnt_on_reasm_queue);
sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
chk->data = NULL;
if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
control->first_frag_seen = 1;
}
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
/* Its complete */
if ((control->on_strm_q) && (control->on_read_q)) {
if (control->pdapi_started) {
control->pdapi_started = 0;
strm->pd_api_started = 0;
}
if (control->on_strm_q == SCTP_ON_UNORDERED) {
/* Unordered */
TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
control->on_strm_q = 0;
} else if (control->on_strm_q == SCTP_ON_ORDERED) {
/* Ordered */
TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
control->on_strm_q = 0;
} else if (control->on_strm_q) {
panic("Unknown state on ctrl:%p on_strm_q:%d", control,
control->on_strm_q);
}
}
control->end_added = 1;
control->last_frag_seen = 1;
}
if (i_locked) {
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
}
/*
* Dump onto the re-assembly queue, in its proper place. After dumping on the
* queue, see if anthing can be delivered. If so pull it off (or as much as
* we can. If we run out of space then we must dump what we can and set the
* appropriate flag to say we queued what we could.
*/
static void
sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
struct sctp_stream_in *strm,
struct sctp_queued_to_read *control,
struct sctp_tmit_chunk *chk,
int created_control,
int *abort_flag, uint32_t tsn)
{
uint32_t next_fsn;
struct sctp_tmit_chunk *at, *nat;
int cnt_added, unordered;
/*
* For old un-ordered data chunks.
*/
if ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED) {
unordered = 1;
} else {
unordered = 0;
}
/* Must be added to the stream-in queue */
if (created_control) {
if (sctp_place_control_in_stream(strm, asoc, control)) {
/* Duplicate SSN? */
clean_up_control(stcb, control);
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_6);
return;
}
if ((tsn == (asoc->cumulative_tsn + 1) && (asoc->idata_supported == 0))) {
/*
* Ok we created this control and now lets validate
* that its legal i.e. there is a B bit set, if not
* and we have up to the cum-ack then its invalid.
*/
if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_7);
return;
}
}
}
if ((asoc->idata_supported == 0) && ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED)) {
sctp_inject_old_data_unordered(stcb, asoc, strm, control, chk, abort_flag);
return;
}
/*
* Ok we must queue the chunk into the reasembly portion: o if its
* the first it goes to the control mbuf. o if its not first but the
* next in sequence it goes to the control, and each succeeding one
* in order also goes. o if its not in order we place it on the list
* in its place.
*/
if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
/* Its the very first one. */
SCTPDBG(SCTP_DEBUG_XXX,
"chunk is a first fsn:%d becomes fsn_included\n",
chk->rec.data.fsn_num);
if (control->first_frag_seen) {
/*
* Error on senders part, they either sent us two
* data chunks with FIRST, or they sent two
* un-ordered chunks that were fragmented at the
* same time in the same stream.
*/
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_8);
return;
}
control->first_frag_seen = 1;
control->fsn_included = chk->rec.data.fsn_num;
control->data = chk->data;
sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
sctp_setup_tail_pointer(control);
} else {
/* Place the chunk in our list */
int inserted = 0;
if (control->last_frag_seen == 0) {
/* Still willing to raise highest FSN seen */
if (SCTP_TSN_GT(chk->rec.data.fsn_num, control->top_fsn)) {
SCTPDBG(SCTP_DEBUG_XXX,
"We have a new top_fsn:%d\n",
chk->rec.data.fsn_num);
control->top_fsn = chk->rec.data.fsn_num;
}
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
SCTPDBG(SCTP_DEBUG_XXX,
"The last fsn is now in place fsn:%d\n",
chk->rec.data.fsn_num);
control->last_frag_seen = 1;
}
if (asoc->idata_supported || control->first_frag_seen) {
/*
* For IDATA we always check since we know
* that the first fragment is 0. For old
* DATA we have to receive the first before
* we knwo the first FSN (which is the TSN).
*/
if (SCTP_TSN_GE(control->fsn_included, chk->rec.data.fsn_num)) {
/*
* We have already delivered up to
* this so its a dup
*/
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_9);
return;
}
}
} else {
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
/* Second last? huh? */
SCTPDBG(SCTP_DEBUG_XXX,
"Duplicate last fsn:%d (top:%d) -- abort\n",
chk->rec.data.fsn_num, control->top_fsn);
sctp_abort_in_reasm(stcb, strm, control,
chk, abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_10);
return;
}
if (asoc->idata_supported || control->first_frag_seen) {
/*
* For IDATA we always check since we know
* that the first fragment is 0. For old
* DATA we have to receive the first before
* we knwo the first FSN (which is the TSN).
*/
if (SCTP_TSN_GE(control->fsn_included, chk->rec.data.fsn_num)) {
/*
* We have already delivered up to
* this so its a dup
*/
SCTPDBG(SCTP_DEBUG_XXX,
"New fsn:%d is already seen in included_fsn:%d -- abort\n",
chk->rec.data.fsn_num, control->fsn_included);
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_11);
return;
}
}
/*
* validate not beyond top FSN if we have seen last
* one
*/
if (SCTP_TSN_GT(chk->rec.data.fsn_num, control->top_fsn)) {
SCTPDBG(SCTP_DEBUG_XXX,
"New fsn:%d is beyond or at top_fsn:%d -- abort\n",
chk->rec.data.fsn_num,
control->top_fsn);
sctp_abort_in_reasm(stcb, strm, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_12);
return;
}
}
/*
* If we reach here, we need to place the new chunk in the
* reassembly for this control.
*/
SCTPDBG(SCTP_DEBUG_XXX,
"chunk is a not first fsn:%d needs to be inserted\n",
chk->rec.data.fsn_num);
TAILQ_FOREACH(at, &control->reasm, sctp_next) {
if (SCTP_TSN_GT(at->rec.data.fsn_num, chk->rec.data.fsn_num)) {
/*
* This one in queue is bigger than the new
* one, insert the new one before at.
*/
SCTPDBG(SCTP_DEBUG_XXX,
"Insert it before fsn:%d\n",
at->rec.data.fsn_num);
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
TAILQ_INSERT_BEFORE(at, chk, sctp_next);
inserted = 1;
break;
} else if (at->rec.data.fsn_num == chk->rec.data.fsn_num) {
/*
* Gak, He sent me a duplicate str seq
* number
*/
/*
* foo bar, I guess I will just free this
* new guy, should we abort too? FIX ME
* MAYBE? Or it COULD be that the SSN's have
* wrapped. Maybe I should compare to TSN
* somehow... sigh for now just blow away
* the chunk!
*/
SCTPDBG(SCTP_DEBUG_XXX,
"Duplicate to fsn:%d -- abort\n",
at->rec.data.fsn_num);
sctp_abort_in_reasm(stcb, strm, control,
chk, abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_13);
return;
}
}
if (inserted == 0) {
/* Goes on the end */
SCTPDBG(SCTP_DEBUG_XXX, "Inserting at tail of list fsn:%d\n",
chk->rec.data.fsn_num);
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next);
}
}
/*
* Ok lets see if we can suck any up into the control structure that
* are in seq if it makes sense.
*/
cnt_added = 0;
/*
* If the first fragment has not been seen there is no sense in
* looking.
*/
if (control->first_frag_seen) {
next_fsn = control->fsn_included + 1;
TAILQ_FOREACH_SAFE(at, &control->reasm, sctp_next, nat) {
if (at->rec.data.fsn_num == next_fsn) {
/* We can add this one now to the control */
SCTPDBG(SCTP_DEBUG_XXX,
"Adding more to control:%p at:%p fsn:%d next_fsn:%d included:%d\n",
control, at,
at->rec.data.fsn_num,
next_fsn, control->fsn_included);
TAILQ_REMOVE(&control->reasm, at, sctp_next);
sctp_add_chk_to_control(control, strm, stcb, asoc, at);
cnt_added++;
next_fsn++;
if (control->end_added && control->pdapi_started) {
if (strm->pd_api_started) {
strm->pd_api_started = 0;
control->pdapi_started = 0;
}
if (control->on_read_q == 0) {
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, control->end_added,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
}
break;
}
} else {
break;
}
}
}
if ((control->on_read_q) && (cnt_added > 0)) {
/* Need to wakeup the reader */
sctp_wakeup_the_read_socket(stcb->sctp_ep);
}
}
static struct sctp_queued_to_read *
find_reasm_entry(struct sctp_stream_in *strm, uint32_t msg_id, int ordered, int old)
{
struct sctp_queued_to_read *reasm;
if (ordered) {
TAILQ_FOREACH(reasm, &strm->inqueue, next_instrm) {
if (reasm->msg_id == msg_id) {
break;
}
}
} else {
if (old) {
reasm = TAILQ_FIRST(&strm->uno_inqueue);
return (reasm);
}
TAILQ_FOREACH(reasm, &strm->uno_inqueue, next_instrm) {
if (reasm->msg_id == msg_id) {
break;
}
}
}
return (reasm);
}
static int
sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
struct mbuf **m, int offset, int chk_length,
struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
int *break_flag, int last_chunk, uint8_t chtype)
{
/* Process a data chunk */
/* struct sctp_tmit_chunk *chk; */
struct sctp_data_chunk *ch;
struct sctp_idata_chunk *nch, chunk_buf;
struct sctp_tmit_chunk *chk;
uint32_t tsn, fsn, gap, msg_id;
struct mbuf *dmbuf;
int the_len;
int need_reasm_check = 0;
uint16_t strmno;
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
struct sctp_queued_to_read *control = NULL;
uint32_t protocol_id;
uint8_t chunk_flags;
struct sctp_stream_reset_list *liste;
struct sctp_stream_in *strm;
int ordered;
size_t clen;
int created_control = 0;
uint8_t old_data;
chk = NULL;
if (chtype == SCTP_IDATA) {
nch = (struct sctp_idata_chunk *)sctp_m_getptr(*m, offset,
sizeof(struct sctp_idata_chunk), (uint8_t *) & chunk_buf);
ch = (struct sctp_data_chunk *)nch;
clen = sizeof(struct sctp_idata_chunk);
tsn = ntohl(ch->dp.tsn);
msg_id = ntohl(nch->dp.msg_id);
if (ch->ch.chunk_flags & SCTP_DATA_FIRST_FRAG)
fsn = 0;
else
fsn = ntohl(nch->dp.fsn);
old_data = 0;
} else {
ch = (struct sctp_data_chunk *)sctp_m_getptr(*m, offset,
sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
tsn = ntohl(ch->dp.tsn);
clen = sizeof(struct sctp_data_chunk);
fsn = tsn;
msg_id = (uint32_t) (ntohs(ch->dp.stream_sequence));
nch = NULL;
old_data = 1;
}
chunk_flags = ch->ch.chunk_flags;
if ((size_t)chk_length == clen) {
/*
* Need to send an abort since we had a empty data chunk.
*/
struct mbuf *op_err;
op_err = sctp_generate_no_user_data_cause(ch->dp.tsn);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
return (0);
}
ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
asoc->send_sack = 1;
}
protocol_id = ch->dp.protocol_id;
ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
}
if (stcb == NULL) {
return (0);
}
SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
/* It is a duplicate */
SCTP_STAT_INCR(sctps_recvdupdata);
if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
/* Record a dup for the next outbound sack */
asoc->dup_tsns[asoc->numduptsns] = tsn;
asoc->numduptsns++;
}
asoc->send_sack = 1;
return (0);
}
/* Calculate the number of TSN's between the base and this TSN */
SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
/* Can't hold the bit in the mapping at max array, toss it */
return (0);
}
if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
SCTP_TCB_LOCK_ASSERT(stcb);
if (sctp_expand_mapping_array(asoc, gap)) {
/* Can't expand, drop it */
return (0);
}
}
if (SCTP_TSN_GT(tsn, *high_tsn)) {
*high_tsn = tsn;
}
/* See if we have received this one already */
if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
SCTP_STAT_INCR(sctps_recvdupdata);
if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
/* Record a dup for the next outbound sack */
asoc->dup_tsns[asoc->numduptsns] = tsn;
asoc->numduptsns++;
}
asoc->send_sack = 1;
return (0);
}
/*
* Check to see about the GONE flag, duplicates would cause a sack
* to be sent up above
*/
if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) {
/*
* wait a minute, this guy is gone, there is no longer a
* receiver. Send peer an ABORT!
*/
op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
return (0);
}
/*
* Now before going further we see if there is room. If NOT then we
* MAY let one through only IF this TSN is the one we are waiting
* for on a partial delivery API.
*/
/* Is the stream valid? */
strmno = ntohs(ch->dp.stream_id);
if (strmno >= asoc->streamincnt) {
struct sctp_error_invalid_stream *cause;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_invalid_stream),
0, M_NOWAIT, 1, MT_DATA);
if (op_err != NULL) {
/* add some space up front so prepend will work well */
SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
cause = mtod(op_err, struct sctp_error_invalid_stream *);
/*
* Error causes are just param's and this one has
* two back to back phdr, one with the error type
* and size, the other with the streamid and a rsvd
*/
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_invalid_stream);
cause->cause.code = htons(SCTP_CAUSE_INVALID_STREAM);
cause->cause.length = htons(sizeof(struct sctp_error_invalid_stream));
cause->stream_id = ch->dp.stream_id;
cause->reserved = htons(0);
sctp_queue_op_err(stcb, op_err);
}
SCTP_STAT_INCR(sctps_badsid);
SCTP_TCB_LOCK_ASSERT(stcb);
SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
asoc->highest_tsn_inside_nr_map = tsn;
}
if (tsn == (asoc->cumulative_tsn + 1)) {
/* Update cum-ack */
asoc->cumulative_tsn = tsn;
}
return (0);
}
strm = &asoc->strmin[strmno];
/*
* If its a fragmented message, lets see if we can find the control
* on the reassembly queues.
*/
if ((chtype == SCTP_IDATA) && ((chunk_flags & SCTP_DATA_FIRST_FRAG) == 0) && (fsn == 0)) {
/*
* The first *must* be fsn 0, and other (middle/end) pieces
* can *not* be fsn 0.
*/
goto err_out;
}
if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
/* See if we can find the re-assembly entity */
control = find_reasm_entry(strm, msg_id, ordered, old_data);
SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags:0x%x look for control on queues %p\n",
chunk_flags, control);
if (control) {
/* We found something, does it belong? */
if (ordered && (msg_id != control->sinfo_ssn)) {
err_out:
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
return (0);
}
if (ordered && ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED)) {
/*
* We can't have a switched order with an
* unordered chunk
*/
goto err_out;
}
if (!ordered && (((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED) == 0)) {
/*
* We can't have a switched unordered with a
* ordered chunk
*/
goto err_out;
}
}
} else {
/*
* Its a complete segment. Lets validate we don't have a
* re-assembly going on with the same Stream/Seq (for
* ordered) or in the same Stream for unordered.
*/
SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags:0x%x look for msg in case we have dup\n",
chunk_flags);
if (find_reasm_entry(strm, msg_id, ordered, old_data)) {
SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags:0x%x dup detected on msg_id:%d\n",
chunk_flags,
msg_id);
goto err_out;
}
}
/* now do the tests */
if (((asoc->cnt_on_all_streams +
asoc->cnt_on_reasm_queue +
asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
(((int)asoc->my_rwnd) <= 0)) {
/*
* When we have NO room in the rwnd we check to make sure
* the reader is doing its job...
*/
if (stcb->sctp_socket->so_rcv.sb_cc) {
/* some to read, wake-up */
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/* assoc was freed while we were unlocked */
SCTP_SOCKET_UNLOCK(so, 1);
return (0);
}
#endif
sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
/* now is it in the mapping array of what we have accepted? */
if (nch == NULL) {
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
/* Nope not in the valid range dump it */
dump_packet:
sctp_set_rwnd(stcb, asoc);
if ((asoc->cnt_on_all_streams +
asoc->cnt_on_reasm_queue +
asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
SCTP_STAT_INCR(sctps_datadropchklmt);
} else {
SCTP_STAT_INCR(sctps_datadroprwnd);
}
*break_flag = 1;
return (0);
}
} else {
if (control == NULL) {
goto dump_packet;
}
if (SCTP_TSN_GT(fsn, control->top_fsn)) {
goto dump_packet;
}
}
}
#ifdef SCTP_ASOCLOG_OF_TSNS
SCTP_TCB_LOCK_ASSERT(stcb);
if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
asoc->tsn_in_at = 0;
asoc->tsn_in_wrapped = 1;
}
asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
asoc->in_tsnlog[asoc->tsn_in_at].seq = msg_id;
asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
asoc->tsn_in_at++;
#endif
/*
* Before we continue lets validate that we are not being fooled by
* an evil attacker. We can only have Nk chunks based on our TSN
* spread allowed by the mapping array N * 8 bits, so there is no
* way our stream sequence numbers could have wrapped. We of course
* only validate the FIRST fragment so the bit must be set.
*/
if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
(TAILQ_EMPTY(&asoc->resetHead)) &&
(chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
SCTP_MSGID_GE(old_data, asoc->strmin[strmno].last_sequence_delivered, msg_id)) {
/* The incoming sseq is behind where we last delivered? */
SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
msg_id, asoc->strmin[strmno].last_sequence_delivered);
snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
asoc->strmin[strmno].last_sequence_delivered,
tsn, strmno, msg_id);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
return (0);
}
/************************************
* From here down we may find ch-> invalid
* so its a good idea NOT to use it.
*************************************/
if (nch) {
the_len = (chk_length - sizeof(struct sctp_idata_chunk));
} else {
the_len = (chk_length - sizeof(struct sctp_data_chunk));
}
if (last_chunk == 0) {
if (nch) {
dmbuf = SCTP_M_COPYM(*m,
(offset + sizeof(struct sctp_idata_chunk)),
the_len, M_NOWAIT);
} else {
dmbuf = SCTP_M_COPYM(*m,
(offset + sizeof(struct sctp_data_chunk)),
the_len, M_NOWAIT);
}
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY);
}
#endif
} else {
/* We can steal the last chunk */
int l_len;
dmbuf = *m;
/* lop off the top part */
if (nch) {
m_adj(dmbuf, (offset + sizeof(struct sctp_idata_chunk)));
} else {
m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
}
if (SCTP_BUF_NEXT(dmbuf) == NULL) {
l_len = SCTP_BUF_LEN(dmbuf);
} else {
/*
* need to count up the size hopefully does not hit
* this to often :-0
*/
struct mbuf *lat;
l_len = 0;
for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
l_len += SCTP_BUF_LEN(lat);
}
}
if (l_len > the_len) {
/* Trim the end round bytes off too */
m_adj(dmbuf, -(l_len - the_len));
}
}
if (dmbuf == NULL) {
SCTP_STAT_INCR(sctps_nomem);
return (0);
}
/*
* Now no matter what we need a control, get one if we don't have
* one (we may have gotten it above when we found the message was
* fragmented
*/
if (control == NULL) {
sctp_alloc_a_readq(stcb, control);
sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
protocol_id,
strmno, msg_id,
chunk_flags,
NULL, fsn, msg_id);
if (control == NULL) {
SCTP_STAT_INCR(sctps_nomem);
return (0);
}
if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
control->data = dmbuf;
control->tail_mbuf = NULL;
control->end_added = control->last_frag_seen = control->first_frag_seen = 1;
control->top_fsn = control->fsn_included = fsn;
}
created_control = 1;
}
SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags:0x%x ordered:%d msgid:%d control:%p\n",
chunk_flags, ordered, msg_id, control);
if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
TAILQ_EMPTY(&asoc->resetHead) &&
((ordered == 0) ||
((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == msg_id &&
TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
/* Candidate for express delivery */
/*
* Its not fragmented, No PD-API is up, Nothing in the
* delivery queue, Its un-ordered OR ordered and the next to
* deliver AND nothing else is stuck on the stream queue,
* And there is room for it in the socket buffer. Lets just
* stuff it up the buffer....
*/
SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
asoc->highest_tsn_inside_nr_map = tsn;
}
SCTPDBG(SCTP_DEBUG_XXX, "Injecting control:%p to be read (mid:%d)\n",
control, msg_id);
sctp_add_to_readq(stcb->sctp_ep, stcb,
control, &stcb->sctp_socket->so_rcv,
1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
/* for ordered, bump what we delivered */
strm->last_sequence_delivered++;
}
SCTP_STAT_INCR(sctps_recvexpress);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del_alt(stcb, tsn, msg_id, strmno,
SCTP_STR_LOG_FROM_EXPRS_DEL);
}
control = NULL;
goto finish_express_del;
}
/* Now will we need a chunk too? */
if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* No memory so we drop the chunk */
SCTP_STAT_INCR(sctps_nomem);
if (last_chunk == 0) {
/* we copied it, free the copy */
sctp_m_freem(dmbuf);
}
return (0);
}
chk->rec.data.TSN_seq = tsn;
chk->no_fr_allowed = 0;
chk->rec.data.fsn_num = fsn;
chk->rec.data.stream_seq = msg_id;
chk->rec.data.stream_number = strmno;
chk->rec.data.payloadtype = protocol_id;
chk->rec.data.context = stcb->asoc.context;
chk->rec.data.doing_fast_retransmit = 0;
chk->rec.data.rcv_flags = chunk_flags;
chk->asoc = asoc;
chk->send_size = the_len;
chk->whoTo = net;
SCTPDBG(SCTP_DEBUG_XXX, "Building ck:%p for control:%p to be read (mid:%d)\n",
chk,
control, msg_id);
atomic_add_int(&net->ref_count, 1);
chk->data = dmbuf;
}
/* Set the appropriate TSN mark */
if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
asoc->highest_tsn_inside_nr_map = tsn;
}
} else {
SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
asoc->highest_tsn_inside_map = tsn;
}
}
/* Now is it complete (i.e. not fragmented)? */
if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
/*
* Special check for when streams are resetting. We could be
* more smart about this and check the actual stream to see
* if it is not being reset.. that way we would not create a
* HOLB when amongst streams being reset and those not being
* reset.
*
*/
if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
SCTP_TSN_GT(tsn, liste->tsn)) {
/*
* yep its past where we need to reset... go ahead
* and queue it.
*/
if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
/* first one on */
TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
} else {
struct sctp_queued_to_read *ctlOn, *nctlOn;
unsigned char inserted = 0;
TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
continue;
} else {
/* found it */
TAILQ_INSERT_BEFORE(ctlOn, control, next);
inserted = 1;
break;
}
}
if (inserted == 0) {
/*
* must be put at end, use prevP
* (all setup from loop) to setup
* nextP.
*/
TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
}
}
goto finish_express_del;
}
if (chunk_flags & SCTP_DATA_UNORDERED) {
/* queue directly into socket buffer */
SCTPDBG(SCTP_DEBUG_XXX, "Unordered data to be read control:%p msg_id:%d\n",
control, msg_id);
sctp_mark_non_revokable(asoc, control->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
} else {
SCTPDBG(SCTP_DEBUG_XXX, "Queue control:%p for reordering msg_id:%d\n", control,
msg_id);
sctp_queue_data_to_stream(stcb, strm, asoc, control, abort_flag, &need_reasm_check);
if (*abort_flag) {
if (last_chunk) {
*m = NULL;
}
return (0);
}
}
goto finish_express_del;
}
/* If we reach here its a reassembly */
need_reasm_check = 1;
SCTPDBG(SCTP_DEBUG_XXX,
"Queue data to stream for reasm control:%p msg_id:%d\n",
control, msg_id);
sctp_queue_data_for_reasm(stcb, asoc, strm, control, chk, created_control, abort_flag, tsn);
if (*abort_flag) {
/*
* the assoc is now gone and chk was put onto the reasm
* queue, which has all been freed.
*/
if (last_chunk) {
*m = NULL;
}
return (0);
}
finish_express_del:
/* Here we tidy up things */
if (tsn == (asoc->cumulative_tsn + 1)) {
/* Update cum-ack */
asoc->cumulative_tsn = tsn;
}
if (last_chunk) {
*m = NULL;
}
if (ordered) {
SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
} else {
SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
}
SCTP_STAT_INCR(sctps_recvdata);
/* Set it present please */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del_alt(stcb, tsn, msg_id, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
}
/* check the special flag for stream resets */
if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
/*
* we have finished working through the backlogged TSN's now
* time to reset streams. 1: call reset function. 2: free
* pending_reply space 3: distribute any chunks in
* pending_reply_queue.
*/
struct sctp_queued_to_read *ctl, *nctl;
sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams);
TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
sctp_send_deferred_reset_response(stcb, liste, SCTP_STREAM_RESET_RESULT_PERFORMED);
SCTP_FREE(liste, SCTP_M_STRESET);
/* sa_ignore FREED_MEMORY */
liste = TAILQ_FIRST(&asoc->resetHead);
if (TAILQ_EMPTY(&asoc->resetHead)) {
/* All can be removed */
TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
sctp_queue_data_to_stream(stcb, strm, asoc, ctl, abort_flag, &need_reasm_check);
if (*abort_flag) {
return (0);
}
}
} else {
TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) {
break;
}
/*
* if ctl->sinfo_tsn is <= liste->tsn we can
* process it which is the NOT of
* ctl->sinfo_tsn > liste->tsn
*/
TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
sctp_queue_data_to_stream(stcb, strm, asoc, ctl, abort_flag, &need_reasm_check);
if (*abort_flag) {
return (0);
}
}
}
/*
* Now service re-assembly to pick up anything that has been
* held on reassembly queue?
*/
(void)sctp_deliver_reasm_check(stcb, asoc, strm);
need_reasm_check = 0;
}
if (need_reasm_check) {
/* Another one waits ? */
(void)sctp_deliver_reasm_check(stcb, asoc, strm);
}
return (1);
}
static const int8_t sctp_map_lookup_tab[256] = {
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 5,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 6,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 5,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 7,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 5,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 6,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 5,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 8
};
void
sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
{
/*
* Now we also need to check the mapping array in a couple of ways.
* 1) Did we move the cum-ack point?
*
* When you first glance at this you might think that all entries that
* make up the postion of the cum-ack would be in the nr-mapping
* array only.. i.e. things up to the cum-ack are always
* deliverable. Thats true with one exception, when its a fragmented
* message we may not deliver the data until some threshold (or all
* of it) is in place. So we must OR the nr_mapping_array and
* mapping_array to get a true picture of the cum-ack.
*/
struct sctp_association *asoc;
int at;
uint8_t val;
int slide_from, slide_end, lgap, distance;
uint32_t old_cumack, old_base, old_highest, highest_tsn;
asoc = &stcb->asoc;
old_cumack = asoc->cumulative_tsn;
old_base = asoc->mapping_array_base_tsn;
old_highest = asoc->highest_tsn_inside_map;
/*
* We could probably improve this a small bit by calculating the
* offset of the current cum-ack as the starting point.
*/
at = 0;
for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
if (val == 0xff) {
at += 8;
} else {
/* there is a 0 bit */
at += sctp_map_lookup_tab[val];
break;
}
}
asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1);
if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) &&
SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) {
#ifdef INVARIANTS
panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
#else
SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
sctp_print_mapping_array(asoc);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn;
#endif
}
if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
highest_tsn = asoc->highest_tsn_inside_nr_map;
} else {
highest_tsn = asoc->highest_tsn_inside_map;
}
if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) {
/* The complete array was completed by a single FR */
/* highest becomes the cum-ack */
int clr;
#ifdef INVARIANTS
unsigned int i;
#endif
/* clear the array */
clr = ((at + 7) >> 3);
if (clr > asoc->mapping_array_size) {
clr = asoc->mapping_array_size;
}
memset(asoc->mapping_array, 0, clr);
memset(asoc->nr_mapping_array, 0, clr);
#ifdef INVARIANTS
for (i = 0; i < asoc->mapping_array_size; i++) {
if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) {
SCTP_PRINTF("Error Mapping array's not clean at clear\n");
sctp_print_mapping_array(asoc);
}
}
#endif
asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
} else if (at >= 8) {
/* we can slide the mapping array down */
/* slide_from holds where we hit the first NON 0xff byte */
/*
* now calculate the ceiling of the move using our highest
* TSN value
*/
SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn);
slide_end = (lgap >> 3);
if (slide_end < slide_from) {
sctp_print_mapping_array(asoc);
#ifdef INVARIANTS
panic("impossible slide");
#else
SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n",
lgap, slide_end, slide_from, at);
return;
#endif
}
if (slide_end > asoc->mapping_array_size) {
#ifdef INVARIANTS
panic("would overrun buffer");
#else
SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n",
asoc->mapping_array_size, slide_end);
slide_end = asoc->mapping_array_size;
#endif
}
distance = (slide_end - slide_from) + 1;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(old_base, old_cumack, old_highest,
SCTP_MAP_PREPARE_SLIDE);
sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
(uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
}
if (distance + slide_from > asoc->mapping_array_size ||
distance < 0) {
/*
* Here we do NOT slide forward the array so that
* hopefully when more data comes in to fill it up
* we will be able to slide it forward. Really I
* don't think this should happen :-0
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
(uint32_t) asoc->mapping_array_size,
SCTP_MAP_SLIDE_NONE);
}
} else {
int ii;
for (ii = 0; ii < distance; ii++) {
asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii];
asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii];
}
for (ii = distance; ii < asoc->mapping_array_size; ii++) {
asoc->mapping_array[ii] = 0;
asoc->nr_mapping_array[ii] = 0;
}
if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) {
asoc->highest_tsn_inside_map += (slide_from << 3);
}
if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) {
asoc->highest_tsn_inside_nr_map += (slide_from << 3);
}
asoc->mapping_array_base_tsn += (slide_from << 3);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(asoc->mapping_array_base_tsn,
asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
SCTP_MAP_SLIDE_RESULT);
}
}
}
}
void
sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap)
{
struct sctp_association *asoc;
uint32_t highest_tsn;
asoc = &stcb->asoc;
if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
highest_tsn = asoc->highest_tsn_inside_nr_map;
} else {
highest_tsn = asoc->highest_tsn_inside_map;
}
/*
* Now we need to see if we need to queue a sack or just start the
* timer (if allowed).
*/
if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
/*
* Ok special case, in SHUTDOWN-SENT case. here we maker
* sure SACK timer is off and instead send a SHUTDOWN and a
* SACK
*/
if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
}
sctp_send_shutdown(stcb,
((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
} else {
int is_a_gap;
/* is there a gap now ? */
is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
/*
* CMT DAC algorithm: increase number of packets received
* since last ack
*/
stcb->asoc.cmt_dac_pkts_rcvd++;
if ((stcb->asoc.send_sack == 1) || /* We need to send a
* SACK */
((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
* longer is one */
(stcb->asoc.numduptsns) || /* we have dup's */
(is_a_gap) || /* is still a gap */
(stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */
(stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
) {
if ((stcb->asoc.sctp_cmt_on_off > 0) &&
(SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
(stcb->asoc.send_sack == 0) &&
(stcb->asoc.numduptsns == 0) &&
(stcb->asoc.delayed_ack) &&
(!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
/*
* CMT DAC algorithm: With CMT, delay acks
* even in the face of
*
* reordering. Therefore, if acks that do not
* have to be sent because of the above
* reasons, will be delayed. That is, acks
* that would have been sent due to gap
* reports will be delayed with DAC. Start
* the delayed ack timer.
*/
sctp_timer_start(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL);
} else {
/*
* Ok we must build a SACK since the timer
* is pending, we got our first packet OR
* there are gaps or duplicates.
*/
(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
}
} else {
if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
sctp_timer_start(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL);
}
}
}
}
int
sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
struct sctp_inpcb *inp, struct sctp_tcb *stcb,
struct sctp_nets *net, uint32_t * high_tsn)
{
struct sctp_chunkhdr *ch, chunk_buf;
struct sctp_association *asoc;
int num_chunks = 0; /* number of control chunks processed */
int stop_proc = 0;
int chk_length, break_flag, last_chunk;
int abort_flag = 0, was_a_gap;
struct mbuf *m;
uint32_t highest_tsn;
/* set the rwnd */
sctp_set_rwnd(stcb, &stcb->asoc);
m = *mm;
SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
highest_tsn = asoc->highest_tsn_inside_nr_map;
} else {
highest_tsn = asoc->highest_tsn_inside_map;
}
was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
/*
* setup where we got the last DATA packet from for any SACK that
* may need to go out. Don't bump the net. This is done ONLY when a
* chunk is assigned.
*/
asoc->last_data_chunk_from = net;
/*-
* Now before we proceed we must figure out if this is a wasted
* cluster... i.e. it is a small packet sent in and yet the driver
* underneath allocated a full cluster for it. If so we must copy it
* to a smaller mbuf and free up the cluster mbuf. This will help
* with cluster starvation. Note for __Panda__ we don't do this
* since it has clusters all the way down to 64 bytes.
*/
if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
/* we only handle mbufs that are singletons.. not chains */
m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA);
if (m) {
/* ok lets see if we can copy the data up */
caddr_t *from, *to;
/* get the pointers and copy */
to = mtod(m, caddr_t *);
from = mtod((*mm), caddr_t *);
memcpy(to, from, SCTP_BUF_LEN((*mm)));
/* copy the length and free up the old */
SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
sctp_m_freem(*mm);
/* sucess, back copy */
*mm = m;
} else {
/* We are in trouble in the mbuf world .. yikes */
m = *mm;
}
}
/* get pointer to the first chunk header */
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_chunkhdr), (uint8_t *) & chunk_buf);
if (ch == NULL) {
return (1);
}
/*
* process all DATA chunks...
*/
*high_tsn = asoc->cumulative_tsn;
break_flag = 0;
asoc->data_pkts_seen++;
while (stop_proc == 0) {
/* validate chunk length */
chk_length = ntohs(ch->chunk_length);
if (length - *offset < chk_length) {
/* all done, mutulated chunk */
stop_proc = 1;
continue;
}
if ((asoc->idata_supported == 1) &&
(ch->chunk_type == SCTP_DATA)) {
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
snprintf(msg, sizeof(msg), "I-DATA chunk received when DATA was negotiated");
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_18;
sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
return (2);
}
if ((asoc->idata_supported == 0) &&
(ch->chunk_type == SCTP_IDATA)) {
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
snprintf(msg, sizeof(msg), "DATA chunk received when I-DATA was negotiated");
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
return (2);
}
if ((ch->chunk_type == SCTP_DATA) ||
(ch->chunk_type == SCTP_IDATA)) {
int clen;
if (ch->chunk_type == SCTP_DATA) {
clen = sizeof(struct sctp_data_chunk);
} else {
clen = sizeof(struct sctp_idata_chunk);
}
if ((size_t)chk_length < clen) {
/*
* Need to send an abort since we had a
* invalid data chunk.
*/
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
snprintf(msg, sizeof(msg), "DATA chunk of length %d",
chk_length);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_20;
sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
return (2);
}
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xB1, 0);
#endif
if (SCTP_SIZE32(chk_length) == (length - *offset)) {
last_chunk = 1;
} else {
last_chunk = 0;
}
if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset,
chk_length, net, high_tsn, &abort_flag, &break_flag,
last_chunk, ch->chunk_type)) {
num_chunks++;
}
if (abort_flag)
return (2);
if (break_flag) {
/*
* Set because of out of rwnd space and no
* drop rep space left.
*/
stop_proc = 1;
continue;
}
} else {
/* not a data chunk in the data region */
switch (ch->chunk_type) {
case SCTP_INITIATION:
case SCTP_INITIATION_ACK:
case SCTP_SELECTIVE_ACK:
case SCTP_NR_SELECTIVE_ACK:
case SCTP_HEARTBEAT_REQUEST:
case SCTP_HEARTBEAT_ACK:
case SCTP_ABORT_ASSOCIATION:
case SCTP_SHUTDOWN:
case SCTP_SHUTDOWN_ACK:
case SCTP_OPERATION_ERROR:
case SCTP_COOKIE_ECHO:
case SCTP_COOKIE_ACK:
case SCTP_ECN_ECHO:
case SCTP_ECN_CWR:
case SCTP_SHUTDOWN_COMPLETE:
case SCTP_AUTHENTICATION:
case SCTP_ASCONF_ACK:
case SCTP_PACKET_DROPPED:
case SCTP_STREAM_RESET:
case SCTP_FORWARD_CUM_TSN:
case SCTP_ASCONF:
/*
* Now, what do we do with KNOWN chunks that
* are NOT in the right place?
*
* For now, I do nothing but ignore them. We
* may later want to add sysctl stuff to
* switch out and do either an ABORT() or
* possibly process them.
*/
if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) {
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
snprintf(msg, sizeof(msg), "DATA chunk followed by chunk of type %2.2x",
ch->chunk_type);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
return (2);
}
break;
default:
/* unknown chunk type, use bit rules */
if (ch->chunk_type & 0x40) {
/* Add a error report to the queue */
struct mbuf *op_err;
struct sctp_gen_error_cause *cause;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
0, M_NOWAIT, 1, MT_DATA);
if (op_err != NULL) {
cause = mtod(op_err, struct sctp_gen_error_cause *);
cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
cause->length = htons((uint16_t) (chk_length + 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, chk_length, M_NOWAIT);
if (SCTP_BUF_NEXT(op_err) != NULL) {
sctp_queue_op_err(stcb, op_err);
} else {
sctp_m_freem(op_err);
}
}
}
if ((ch->chunk_type & 0x80) == 0) {
/* discard the rest of this packet */
stop_proc = 1;
} /* else skip this bad chunk and
* continue... */
break;
} /* switch of chunk type */
}
*offset += SCTP_SIZE32(chk_length);
if ((*offset >= length) || stop_proc) {
/* no more data left in the mbuf chain */
stop_proc = 1;
continue;
}
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_chunkhdr), (uint8_t *) & chunk_buf);
if (ch == NULL) {
*offset = length;
stop_proc = 1;
continue;
}
}
if (break_flag) {
/*
* we need to report rwnd overrun drops.
*/
sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0);
}
if (num_chunks) {
/*
* Did we get data, if so update the time for auto-close and
* give peer credit for being alive.
*/
SCTP_STAT_INCR(sctps_recvpktwithdata);
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_INDATA,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
}
/* now service all of the reassm queue if needed */
if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
/* Assure that we ack right away */
stcb->asoc.send_sack = 1;
}
/* Start a sack timer or QUEUE a SACK for sending */
sctp_sack_check(stcb, was_a_gap);
return (0);
}
static int
sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
int *num_frs,
uint32_t * biggest_newly_acked_tsn,
uint32_t * this_sack_lowest_newack,
int *rto_ok)
{
struct sctp_tmit_chunk *tp1;
unsigned int theTSN;
int j, wake_him = 0, circled = 0;
/* Recover the tp1 we last saw */
tp1 = *p_tp1;
if (tp1 == NULL) {
tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
}
for (j = frag_strt; j <= frag_end; j++) {
theTSN = j + last_tsn;
while (tp1) {
if (tp1->rec.data.doing_fast_retransmit)
(*num_frs) += 1;
/*-
* CMT: CUCv2 algorithm. For each TSN being
* processed from the sent queue, track the
* next expected pseudo-cumack, or
* rtx_pseudo_cumack, if required. Separate
* cumack trackers for first transmissions,
* and retransmissions.
*/
if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
(tp1->whoTo->find_pseudo_cumack == 1) &&
(tp1->snd_count == 1)) {
tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
tp1->whoTo->find_pseudo_cumack = 0;
}
if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
(tp1->whoTo->find_rtx_pseudo_cumack == 1) &&
(tp1->snd_count > 1)) {
tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
tp1->whoTo->find_rtx_pseudo_cumack = 0;
}
if (tp1->rec.data.TSN_seq == theTSN) {
if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
/*-
* must be held until
* cum-ack passes
*/
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
/*-
* If it is less than RESEND, it is
* now no-longer in flight.
* Higher values may already be set
* via previous Gap Ack Blocks...
* i.e. ACKED or RESEND.
*/
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
*biggest_newly_acked_tsn)) {
*biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
}
/*-
* CMT: SFR algo (and HTNA) - set
* saw_newack to 1 for dest being
* newly acked. update
* this_sack_highest_newack if
* appropriate.
*/
if (tp1->rec.data.chunk_was_revoked == 0)
tp1->whoTo->saw_newack = 1;
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
tp1->whoTo->this_sack_highest_newack)) {
tp1->whoTo->this_sack_highest_newack =
tp1->rec.data.TSN_seq;
}
/*-
* CMT DAC algo: also update
* this_sack_lowest_newack
*/
if (*this_sack_lowest_newack == 0) {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(*this_sack_lowest_newack,
last_tsn,
tp1->rec.data.TSN_seq,
0,
0,
SCTP_LOG_TSN_ACKED);
}
*this_sack_lowest_newack = tp1->rec.data.TSN_seq;
}
/*-
* CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
* dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
* new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
* updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
* Separate pseudo_cumack trackers for first transmissions and
* retransmissions.
*/
if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
if (tp1->rec.data.chunk_was_revoked == 0) {
tp1->whoTo->new_pseudo_cumack = 1;
}
tp1->whoTo->find_pseudo_cumack = 1;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
}
if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
if (tp1->rec.data.chunk_was_revoked == 0) {
tp1->whoTo->new_pseudo_cumack = 1;
}
tp1->whoTo->find_rtx_pseudo_cumack = 1;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(*biggest_newly_acked_tsn,
last_tsn,
tp1->rec.data.TSN_seq,
frag_strt,
frag_end,
SCTP_LOG_TSN_ACKED);
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(tp1);
if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
tp1);
}
sctp_total_flight_decrease(stcb, tp1);
tp1->whoTo->net_ack += tp1->send_size;
if (tp1->snd_count < 2) {
/*-
* True non-retransmited chunk
*/
tp1->whoTo->net_ack2 += tp1->send_size;
/*-
* update RTO too ?
*/
if (tp1->do_rtt) {
if (*rto_ok) {
tp1->whoTo->RTO =
sctp_calculate_rto(stcb,
&stcb->asoc,
tp1->whoTo,
&tp1->sent_rcv_time,
sctp_align_safe_nocopy,
SCTP_RTT_FROM_DATA);
*rto_ok = 0;
}
if (tp1->whoTo->rto_needed == 0) {
tp1->whoTo->rto_needed = 1;
}
tp1->do_rtt = 0;
}
}
}
if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
stcb->asoc.this_sack_highest_gap)) {
stcb->asoc.this_sack_highest_gap =
tp1->rec.data.TSN_seq;
}
if (tp1->sent == SCTP_DATAGRAM_RESEND) {
sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xB2,
(stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
#endif
}
}
/*-
* All chunks NOT UNSENT fall through here and are marked
* (leave PR-SCTP ones that are to skip alone though)
*/
if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) &&
(tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
tp1->sent = SCTP_DATAGRAM_MARKED;
}
if (tp1->rec.data.chunk_was_revoked) {
/* deflate the cwnd */
tp1->whoTo->cwnd -= tp1->book_size;
tp1->rec.data.chunk_was_revoked = 0;
}
/* NR Sack code here */
if (nr_sacking &&
(tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--;
#ifdef INVARIANTS
} else {
panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
#endif
}
if ((stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues == 0) &&
(stcb->asoc.strmout[tp1->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
TAILQ_EMPTY(&stcb->asoc.strmout[tp1->rec.data.stream_number].outqueue)) {
stcb->asoc.trigger_reset = 1;
}
tp1->sent = SCTP_DATAGRAM_NR_ACKED;
if (tp1->data) {
/*
* sa_ignore
* NO_NULL_CHK
*/
sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
sctp_m_freem(tp1->data);
tp1->data = NULL;
}
wake_him++;
}
}
break;
} /* if (tp1->TSN_seq == theTSN) */
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
break;
}
tp1 = TAILQ_NEXT(tp1, sctp_next);
if ((tp1 == NULL) && (circled == 0)) {
circled++;
tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
}
} /* end while (tp1) */
if (tp1 == NULL) {
circled = 0;
tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
}
/* In case the fragments were not in order we must reset */
} /* end for (j = fragStart */
*p_tp1 = tp1;
return (wake_him); /* Return value only used for nr-sack */
}
static int
sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
uint32_t last_tsn, uint32_t * biggest_tsn_acked,
uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
int num_seg, int num_nr_seg, int *rto_ok)
{
struct sctp_gap_ack_block *frag, block;
struct sctp_tmit_chunk *tp1;
int i;
int num_frs = 0;
int chunk_freed;
int non_revocable;
uint16_t frag_strt, frag_end, prev_frag_end;
tp1 = TAILQ_FIRST(&asoc->sent_queue);
prev_frag_end = 0;
chunk_freed = 0;
for (i = 0; i < (num_seg + num_nr_seg); i++) {
if (i == num_seg) {
prev_frag_end = 0;
tp1 = TAILQ_FIRST(&asoc->sent_queue);
}
frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
*offset += sizeof(block);
if (frag == NULL) {
return (chunk_freed);
}
frag_strt = ntohs(frag->start);
frag_end = ntohs(frag->end);
if (frag_strt > frag_end) {
/* This gap report is malformed, skip it. */
continue;
}
if (frag_strt <= prev_frag_end) {
/* This gap report is not in order, so restart. */
tp1 = TAILQ_FIRST(&asoc->sent_queue);
}
if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
*biggest_tsn_acked = last_tsn + frag_end;
}
if (i < num_seg) {
non_revocable = 0;
} else {
non_revocable = 1;
}
if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
non_revocable, &num_frs, biggest_newly_acked_tsn,
this_sack_lowest_newack, rto_ok)) {
chunk_freed = 1;
}
prev_frag_end = frag_end;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
if (num_frs)
sctp_log_fr(*biggest_tsn_acked,
*biggest_newly_acked_tsn,
last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
}
return (chunk_freed);
}
static void
sctp_check_for_revoked(struct sctp_tcb *stcb,
struct sctp_association *asoc, uint32_t cumack,
uint32_t biggest_tsn_acked)
{
struct sctp_tmit_chunk *tp1;
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
/*
* ok this guy is either ACK or MARKED. If it is
* ACKED it has been previously acked but not this
* time i.e. revoked. If it is MARKED it was ACK'ed
* again.
*/
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
break;
}
if (tp1->sent == SCTP_DATAGRAM_ACKED) {
/* it has been revoked */
tp1->sent = SCTP_DATAGRAM_SENT;
tp1->rec.data.chunk_was_revoked = 1;
/*
* We must add this stuff back in to assure
* timers and such get started.
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_increase(tp1);
sctp_total_flight_increase(stcb, tp1);
/*
* We inflate the cwnd to compensate for our
* artificial inflation of the flight_size.
*/
tp1->whoTo->cwnd += tp1->book_size;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(asoc->last_acked_seq,
cumack,
tp1->rec.data.TSN_seq,
0,
0,
SCTP_LOG_TSN_REVOKED);
}
} else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
/* it has been re-acked in this SACK */
tp1->sent = SCTP_DATAGRAM_ACKED;
}
}
if (tp1->sent == SCTP_DATAGRAM_UNSENT)
break;
}
}
static void
sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
{
struct sctp_tmit_chunk *tp1;
int strike_flag = 0;
struct timeval now;
int tot_retrans = 0;
uint32_t sending_seq;
struct sctp_nets *net;
int num_dests_sacked = 0;
/*
* select the sending_seq, this is either the next thing ready to be
* sent but not transmitted, OR, the next seq we assign.
*/
tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
if (tp1 == NULL) {
sending_seq = asoc->sending_seq;
} else {
sending_seq = tp1->rec.data.TSN_seq;
}
/* CMT DAC algo: finding out if SACK is a mixed SACK */
if ((asoc->sctp_cmt_on_off > 0) &&
SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (net->saw_newack)
num_dests_sacked++;
}
}
if (stcb->asoc.prsctp_supported) {
(void)SCTP_GETTIME_TIMEVAL(&now);
}
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
strike_flag = 0;
if (tp1->no_fr_allowed) {
/* this one had a timeout or something */
continue;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
if (tp1->sent < SCTP_DATAGRAM_RESEND)
sctp_log_fr(biggest_tsn_newly_acked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_CHECK_STRIKE);
}
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
tp1->sent == SCTP_DATAGRAM_UNSENT) {
/* done */
break;
}
if (stcb->asoc.prsctp_supported) {
if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
/* Is it expired? */
if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
/* Yes so drop it */
if (tp1->data != NULL) {
(void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
SCTP_SO_NOT_LOCKED);
}
continue;
}
}
}
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
/* we are beyond the tsn in the sack */
break;
}
if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
/* either a RESEND, ACKED, or MARKED */
/* skip */
if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
/* Continue strikin FWD-TSN chunks */
tp1->rec.data.fwd_tsn_cnt++;
}
continue;
}
/*
* CMT : SFR algo (covers part of DAC and HTNA as well)
*/
if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
/*
* No new acks were receieved for data sent to this
* dest. Therefore, according to the SFR algo for
* CMT, no data sent to this dest can be marked for
* FR using this SACK.
*/
continue;
} else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
tp1->whoTo->this_sack_highest_newack)) {
/*
* CMT: New acks were receieved for data sent to
* this dest. But no new acks were seen for data
* sent after tp1. Therefore, according to the SFR
* algo for CMT, tp1 cannot be marked for FR using
* this SACK. This step covers part of the DAC algo
* and the HTNA algo as well.
*/
continue;
}
/*
* Here we check to see if we were have already done a FR
* and if so we see if the biggest TSN we saw in the sack is
* smaller than the recovery point. If so we don't strike
* the tsn... otherwise we CAN strike the TSN.
*/
/*
* @@@ JRI: Check for CMT if (accum_moved &&
* asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
* 0)) {
*/
if (accum_moved && asoc->fast_retran_loss_recovery) {
/*
* Strike the TSN if in fast-recovery and cum-ack
* moved.
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(biggest_tsn_newly_acked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_STRIKE_CHUNK);
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
tp1->sent++;
}
if ((asoc->sctp_cmt_on_off > 0) &&
SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
/*
* CMT DAC algorithm: If SACK flag is set to
* 0, then lowest_newack test will not pass
* because it would have been set to the
* cumack earlier. If not already to be
* rtx'd, If not a mixed sack and if tp1 is
* not between two sacked TSNs, then mark by
* one more. NOTE that we are marking by one
* additional time since the SACK DAC flag
* indicates that two packets have been
* received after this missing TSN.
*/
if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(16 + num_dests_sacked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_STRIKE_CHUNK);
}
tp1->sent++;
}
}
} else if ((tp1->rec.data.doing_fast_retransmit) &&
(asoc->sctp_cmt_on_off == 0)) {
/*
* For those that have done a FR we must take
* special consideration if we strike. I.e the
* biggest_newly_acked must be higher than the
* sending_seq at the time we did the FR.
*/
if (
#ifdef SCTP_FR_TO_ALTERNATE
/*
* If FR's go to new networks, then we must only do
* this for singly homed asoc's. However if the FR's
* go to the same network (Armando's work) then its
* ok to FR multiple times.
*/
(asoc->numnets < 2)
#else
(1)
#endif
) {
if (SCTP_TSN_GE(biggest_tsn_newly_acked,
tp1->rec.data.fast_retran_tsn)) {
/*
* Strike the TSN, since this ack is
* beyond where things were when we
* did a FR.
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(biggest_tsn_newly_acked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_STRIKE_CHUNK);
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
tp1->sent++;
}
strike_flag = 1;
if ((asoc->sctp_cmt_on_off > 0) &&
SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
/*
* CMT DAC algorithm: If
* SACK flag is set to 0,
* then lowest_newack test
* will not pass because it
* would have been set to
* the cumack earlier. If
* not already to be rtx'd,
* If not a mixed sack and
* if tp1 is not between two
* sacked TSNs, then mark by
* one more. NOTE that we
* are marking by one
* additional time since the
* SACK DAC flag indicates
* that two packets have
* been received after this
* missing TSN.
*/
if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
(num_dests_sacked == 1) &&
SCTP_TSN_GT(this_sack_lowest_newack,
tp1->rec.data.TSN_seq)) {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(32 + num_dests_sacked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_STRIKE_CHUNK);
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
tp1->sent++;
}
}
}
}
}
/*
* JRI: TODO: remove code for HTNA algo. CMT's SFR
* algo covers HTNA.
*/
} else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
biggest_tsn_newly_acked)) {
/*
* We don't strike these: This is the HTNA
* algorithm i.e. we don't strike If our TSN is
* larger than the Highest TSN Newly Acked.
*/
;
} else {
/* Strike the TSN */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(biggest_tsn_newly_acked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_STRIKE_CHUNK);
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
tp1->sent++;
}
if ((asoc->sctp_cmt_on_off > 0) &&
SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
/*
* CMT DAC algorithm: If SACK flag is set to
* 0, then lowest_newack test will not pass
* because it would have been set to the
* cumack earlier. If not already to be
* rtx'd, If not a mixed sack and if tp1 is
* not between two sacked TSNs, then mark by
* one more. NOTE that we are marking by one
* additional time since the SACK DAC flag
* indicates that two packets have been
* received after this missing TSN.
*/
if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(48 + num_dests_sacked,
tp1->rec.data.TSN_seq,
tp1->sent,
SCTP_FR_LOG_STRIKE_CHUNK);
}
tp1->sent++;
}
}
}
if (tp1->sent == SCTP_DATAGRAM_RESEND) {
struct sctp_nets *alt;
/* fix counts and things */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
(tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
if (tp1->whoTo) {
tp1->whoTo->net_ack++;
sctp_flight_size_decrease(tp1);
if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
tp1);
}
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
}
/* add back to the rwnd */
asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
/* remove from the total flight */
sctp_total_flight_decrease(stcb, tp1);
if ((stcb->asoc.prsctp_supported) &&
(PR_SCTP_RTX_ENABLED(tp1->flags))) {
/*
* Has it been retransmitted tv_sec times? -
* we store the retran count there.
*/
if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
/* Yes, so drop it */
if (tp1->data != NULL) {
(void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
SCTP_SO_NOT_LOCKED);
}
/* Make sure to flag we had a FR */
tp1->whoTo->net_ack++;
continue;
}
}
/*
* SCTP_PRINTF("OK, we are now ready to FR this
* guy\n");
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
0, SCTP_FR_MARKED);
}
if (strike_flag) {
/* This is a subsequent FR */
SCTP_STAT_INCR(sctps_sendmultfastretrans);
}
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
if (asoc->sctp_cmt_on_off > 0) {
/*
* CMT: Using RTX_SSTHRESH policy for CMT.
* If CMT is being used, then pick dest with
* largest ssthresh for any retransmission.
*/
tp1->no_fr_allowed = 1;
alt = tp1->whoTo;
/* sa_ignore NO_NULL_CHK */
if (asoc->sctp_cmt_pf > 0) {
/*
* JRS 5/18/07 - If CMT PF is on,
* use the PF version of
* find_alt_net()
*/
alt = sctp_find_alternate_net(stcb, alt, 2);
} else {
/*
* JRS 5/18/07 - If only CMT is on,
* use the CMT version of
* find_alt_net()
*/
/* sa_ignore NO_NULL_CHK */
alt = sctp_find_alternate_net(stcb, alt, 1);
}
if (alt == NULL) {
alt = tp1->whoTo;
}
/*
* CUCv2: If a different dest is picked for
* the retransmission, then new
* (rtx-)pseudo_cumack needs to be tracked
* for orig dest. Let CUCv2 track new (rtx-)
* pseudo-cumack always.
*/
if (tp1->whoTo) {
tp1->whoTo->find_pseudo_cumack = 1;
tp1->whoTo->find_rtx_pseudo_cumack = 1;
}
} else {/* CMT is OFF */
#ifdef SCTP_FR_TO_ALTERNATE
/* Can we find an alternate? */
alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
#else
/*
* default behavior is to NOT retransmit
* FR's to an alternate. Armando Caro's
* paper details why.
*/
alt = tp1->whoTo;
#endif
}
tp1->rec.data.doing_fast_retransmit = 1;
tot_retrans++;
/* mark the sending seq for possible subsequent FR's */
/*
* SCTP_PRINTF("Marking TSN for FR new value %x\n",
* (uint32_t)tpi->rec.data.TSN_seq);
*/
if (TAILQ_EMPTY(&asoc->send_queue)) {
/*
* If the queue of send is empty then its
* the next sequence number that will be
* assigned so we subtract one from this to
* get the one we last sent.
*/
tp1->rec.data.fast_retran_tsn = sending_seq;
} else {
/*
* If there are chunks on the send queue
* (unsent data that has made it from the
* stream queues but not out the door, we
* take the first one (which will have the
* lowest TSN) and subtract one to get the
* one we last sent.
*/
struct sctp_tmit_chunk *ttt;
ttt = TAILQ_FIRST(&asoc->send_queue);
tp1->rec.data.fast_retran_tsn =
ttt->rec.data.TSN_seq;
}
if (tp1->do_rtt) {
/*
* this guy had a RTO calculation pending on
* it, cancel it
*/
if ((tp1->whoTo != NULL) &&
(tp1->whoTo->rto_needed == 0)) {
tp1->whoTo->rto_needed = 1;
}
tp1->do_rtt = 0;
}
if (alt != tp1->whoTo) {
/* yes, there is an alternate. */
sctp_free_remote_addr(tp1->whoTo);
/* sa_ignore FREED_MEMORY */
tp1->whoTo = alt;
atomic_add_int(&alt->ref_count, 1);
}
}
}
}
struct sctp_tmit_chunk *
sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
struct sctp_association *asoc)
{
struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
struct timeval now;
int now_filled = 0;
if (asoc->prsctp_supported == 0) {
return (NULL);
}
TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
tp1->sent != SCTP_DATAGRAM_RESEND &&
tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
/* no chance to advance, out of here */
break;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
(tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
sctp_misc_ints(SCTP_FWD_TSN_CHECK,
asoc->advanced_peer_ack_point,
tp1->rec.data.TSN_seq, 0, 0);
}
}
if (!PR_SCTP_ENABLED(tp1->flags)) {
/*
* We can't fwd-tsn past any that are reliable aka
* retransmitted until the asoc fails.
*/
break;
}
if (!now_filled) {
(void)SCTP_GETTIME_TIMEVAL(&now);
now_filled = 1;
}
/*
* now we got a chunk which is marked for another
* retransmission to a PR-stream but has run out its chances
* already maybe OR has been marked to skip now. Can we skip
* it if its a resend?
*/
if (tp1->sent == SCTP_DATAGRAM_RESEND &&
(PR_SCTP_TTL_ENABLED(tp1->flags))) {
/*
* Now is this one marked for resend and its time is
* now up?
*/
if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
/* Yes so drop it */
if (tp1->data) {
(void)sctp_release_pr_sctp_chunk(stcb, tp1,
1, SCTP_SO_NOT_LOCKED);
}
} else {
/*
* No, we are done when hit one for resend
* whos time as not expired.
*/
break;
}
}
/*
* Ok now if this chunk is marked to drop it we can clean up
* the chunk, advance our peer ack point and we can check
* the next chunk.
*/
if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
(tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
/* advance PeerAckPoint goes forward */
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
a_adv = tp1;
} else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
/* No update but we do save the chk */
a_adv = tp1;
}
} else {
/*
* If it is still in RESEND we can advance no
* further
*/
break;
}
}
return (a_adv);
}
static int
sctp_fs_audit(struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
int ret;
#ifndef INVARIANTS
int entry_flight, entry_cnt;
#endif
ret = 0;
#ifndef INVARIANTS
entry_flight = asoc->total_flight;
entry_cnt = asoc->total_flight_count;
#endif
if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
return (0);
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
if (chk->sent < SCTP_DATAGRAM_RESEND) {
SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n",
chk->rec.data.TSN_seq,
chk->send_size,
chk->snd_count);
inflight++;
} else if (chk->sent == SCTP_DATAGRAM_RESEND) {
resend++;
} else if (chk->sent < SCTP_DATAGRAM_ACKED) {
inbetween++;
} else if (chk->sent > SCTP_DATAGRAM_ACKED) {
above++;
} else {
acked++;
}
}
if ((inflight > 0) || (inbetween > 0)) {
#ifdef INVARIANTS
panic("Flight size-express incorrect? \n");
#else
SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n",
entry_flight, entry_cnt);
SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n",
inflight, inbetween, resend, above, acked);
ret = 1;
#endif
}
return (ret);
}
static void
sctp_window_probe_recovery(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_tmit_chunk *tp1)
{
tp1->window_probe = 0;
if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
/* TSN's skipped we do NOT move back. */
sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
tp1->whoTo ? tp1->whoTo->flight_size : 0,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
return;
}
/* First setup this by shrinking flight */
if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
tp1);
}
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, tp1);
/* Now mark for resend */
tp1->sent = SCTP_DATAGRAM_RESEND;
sctp_ucount_incr(asoc->sent_queue_retran_cnt);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
}
void
sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
uint32_t rwnd, int *abort_now, int ecne_seen)
{
struct sctp_nets *net;
struct sctp_association *asoc;
struct sctp_tmit_chunk *tp1, *tp2;
uint32_t old_rwnd;
int win_probe_recovery = 0;
int win_probe_recovered = 0;
int j, done_once = 0;
int rto_ok = 1;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
}
SCTP_TCB_LOCK_ASSERT(stcb);
#ifdef SCTP_ASOCLOG_OF_TSNS
stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
stcb->asoc.cumack_log_at++;
if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
stcb->asoc.cumack_log_at = 0;
}
#endif
asoc = &stcb->asoc;
old_rwnd = asoc->peers_rwnd;
if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
/* old ack */
return;
} else if (asoc->last_acked_seq == cumack) {
/* Window update sack */
asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
(uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
if (asoc->peers_rwnd > old_rwnd) {
goto again;
}
return;
}
/* First setup for CC stuff */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
/* Drag along the window_tsn for cwr's */
net->cwr_window_tsn = cumack;
}
net->prev_cwnd = net->cwnd;
net->net_ack = 0;
net->net_ack2 = 0;
/*
* CMT: Reset CUC and Fast recovery algo variables before
* SACK processing
*/
net->new_pseudo_cumack = 0;
net->will_exit_fast_recovery = 0;
if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
(*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
}
}
if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
uint32_t send_s;
if (!TAILQ_EMPTY(&asoc->sent_queue)) {
tp1 = TAILQ_LAST(&asoc->sent_queue,
sctpchunk_listhead);
send_s = tp1->rec.data.TSN_seq + 1;
} else {
send_s = asoc->sending_seq;
}
if (SCTP_TSN_GE(cumack, send_s)) {
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
*abort_now = 1;
/* XXX */
snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x",
cumack, send_s);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_21;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
return;
}
}
asoc->this_sack_highest_gap = cumack;
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_INDATA,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
/* process the new consecutive TSN first */
TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
SCTP_PRINTF("Warning, an unsent is now acked?\n");
}
if (tp1->sent < SCTP_DATAGRAM_ACKED) {
/*
* If it is less than ACKED, it is
* now no-longer in flight. Higher
* values may occur during marking
*/
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(tp1);
if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
tp1);
}
/* sa_ignore NO_NULL_CHK */
sctp_total_flight_decrease(stcb, tp1);
}
tp1->whoTo->net_ack += tp1->send_size;
if (tp1->snd_count < 2) {
/*
* True non-retransmited
* chunk
*/
tp1->whoTo->net_ack2 +=
tp1->send_size;
/* update RTO too? */
if (tp1->do_rtt) {
if (rto_ok) {
tp1->whoTo->RTO =
/*
* sa_ignore
* NO_NULL_CH
* K
*/
sctp_calculate_rto(stcb,
asoc, tp1->whoTo,
&tp1->sent_rcv_time,
sctp_align_safe_nocopy,
SCTP_RTT_FROM_DATA);
rto_ok = 0;
}
if (tp1->whoTo->rto_needed == 0) {
tp1->whoTo->rto_needed = 1;
}
tp1->do_rtt = 0;
}
}
/*
* CMT: CUCv2 algorithm. From the
* cumack'd TSNs, for each TSN being
* acked for the first time, set the
* following variables for the
* corresp destination.
* new_pseudo_cumack will trigger a
* cwnd update.
* find_(rtx_)pseudo_cumack will
* trigger search for the next
* expected (rtx-)pseudo-cumack.
*/
tp1->whoTo->new_pseudo_cumack = 1;
tp1->whoTo->find_pseudo_cumack = 1;
tp1->whoTo->find_rtx_pseudo_cumack = 1;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
/* sa_ignore NO_NULL_CHK */
sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
}
}
if (tp1->sent == SCTP_DATAGRAM_RESEND) {
sctp_ucount_decr(asoc->sent_queue_retran_cnt);
}
if (tp1->rec.data.chunk_was_revoked) {
/* deflate the cwnd */
tp1->whoTo->cwnd -= tp1->book_size;
tp1->rec.data.chunk_was_revoked = 0;
}
if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
#ifdef INVARIANTS
} else {
panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
#endif
}
}
if ((asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues == 0) &&
(asoc->strmout[tp1->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
TAILQ_EMPTY(&asoc->strmout[tp1->rec.data.stream_number].outqueue)) {
asoc->trigger_reset = 1;
}
TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
if (tp1->data) {
/* sa_ignore NO_NULL_CHK */
sctp_free_bufspace(stcb, asoc, tp1, 1);
sctp_m_freem(tp1->data);
tp1->data = NULL;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(asoc->last_acked_seq,
cumack,
tp1->rec.data.TSN_seq,
0,
0,
SCTP_LOG_FREE_SENT);
}
asoc->sent_queue_cnt--;
sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
} else {
break;
}
}
}
/* sa_ignore NO_NULL_CHK */
if (stcb->sctp_socket) {
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
#endif
SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
/* sa_ignore NO_NULL_CHK */
sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
}
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/* assoc was freed while we were unlocked */
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
} else {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
}
}
/* JRS - Use the congestion control given in the CC module */
if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (net->net_ack2 > 0) {
/*
* Karn's rule applies to clearing error
* count, this is optional.
*/
net->error_count = 0;
if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
/* addr came good */
net->dest_state |= SCTP_ADDR_REACHABLE;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
0, (void *)net, SCTP_SO_NOT_LOCKED);
}
if (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;
}
}
if (net->dest_state & SCTP_ADDR_PF) {
net->dest_state &= ~SCTP_ADDR_PF;
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
/* Done with this net */
net->net_ack = 0;
}
/* restore any doubled timers */
net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
if (net->RTO < stcb->asoc.minrto) {
net->RTO = stcb->asoc.minrto;
}
if (net->RTO > stcb->asoc.maxrto) {
net->RTO = stcb->asoc.maxrto;
}
}
}
asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
}
asoc->last_acked_seq = cumack;
if (TAILQ_EMPTY(&asoc->sent_queue)) {
/* nothing left in-flight */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
net->flight_size = 0;
net->partial_bytes_acked = 0;
}
asoc->total_flight = 0;
asoc->total_flight_count = 0;
}
/* RWND update */
asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
(uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
if (asoc->peers_rwnd > old_rwnd) {
win_probe_recovery = 1;
}
/* Now assure a timer where data is queued at */
again:
j = 0;
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
int to_ticks;
if (win_probe_recovery && (net->window_probe)) {
win_probe_recovered = 1;
/*
* Find first chunk that was used with window probe
* and clear the sent
*/
/* sa_ignore FREED_MEMORY */
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (tp1->window_probe) {
/* move back to data send queue */
sctp_window_probe_recovery(stcb, asoc, tp1);
break;
}
}
}
if (net->RTO == 0) {
to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
} else {
to_ticks = MSEC_TO_TICKS(net->RTO);
}
if (net->flight_size) {
j++;
(void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
sctp_timeout_handler, &net->rxt_timer);
if (net->window_probe) {
net->window_probe = 0;
}
} else {
if (net->window_probe) {
/*
* In window probes we must assure a timer
* is still running there
*/
net->window_probe = 0;
if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
sctp_timeout_handler, &net->rxt_timer);
}
} else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_23);
}
}
}
if ((j == 0) &&
(!TAILQ_EMPTY(&asoc->sent_queue)) &&
(asoc->sent_queue_retran_cnt == 0) &&
(win_probe_recovered == 0) &&
(done_once == 0)) {
/*
* huh, this should not happen unless all packets are
* PR-SCTP and marked to skip of course.
*/
if (sctp_fs_audit(asoc)) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
net->flight_size = 0;
}
asoc->total_flight = 0;
asoc->total_flight_count = 0;
asoc->sent_queue_retran_cnt = 0;
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
sctp_flight_size_increase(tp1);
sctp_total_flight_increase(stcb, tp1);
} else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
sctp_ucount_incr(asoc->sent_queue_retran_cnt);
}
}
}
done_once = 1;
goto again;
}
/**********************************/
/* Now what about shutdown issues */
/**********************************/
if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
/* nothing left on sendqueue.. consider done */
/* clean up */
if ((asoc->stream_queue_cnt == 1) &&
((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
(asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
(asoc->locked_on_sending)
) {
struct sctp_stream_queue_pending *sp;
/*
* I may be in a state where we got all across.. but
* cannot write more due to a shutdown... we abort
* since the user did not indicate EOR in this case.
* The sp will be cleaned during free of the asoc.
*/
sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
sctp_streamhead);
if ((sp) && (sp->length == 0)) {
/* Let cleanup code purge it */
if (sp->msg_is_complete) {
asoc->stream_queue_cnt--;
} else {
asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
asoc->locked_on_sending = NULL;
asoc->stream_queue_cnt--;
}
}
}
if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
(asoc->stream_queue_cnt == 0)) {
if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
/* Need to abort here */
struct mbuf *op_err;
abort_out_now:
*abort_now = 1;
/* XXX */
op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
return;
} else {
struct sctp_nets *netp;
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
sctp_stop_timers_for_shutdown(stcb);
if (asoc->alternate) {
netp = asoc->alternate;
} else {
netp = asoc->primary_destination;
}
sctp_send_shutdown(stcb, netp);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
stcb->sctp_ep, stcb, netp);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, netp);
}
} else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
(asoc->stream_queue_cnt == 0)) {
struct sctp_nets *netp;
if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
goto abort_out_now;
}
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
sctp_stop_timers_for_shutdown(stcb);
if (asoc->alternate) {
netp = asoc->alternate;
} else {
netp = asoc->primary_destination;
}
sctp_send_shutdown_ack(stcb, netp);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
stcb->sctp_ep, stcb, netp);
}
}
/*********************************************/
/* Here we perform PR-SCTP procedures */
/* (section 4.2) */
/*********************************************/
/* C1. update advancedPeerAckPoint */
if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
asoc->advanced_peer_ack_point = cumack;
}
/* PR-Sctp issues need to be addressed too */
if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
struct sctp_tmit_chunk *lchk;
uint32_t old_adv_peer_ack_point;
old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
/* C3. See if we need to send a Fwd-TSN */
if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
/*
* ISSUE with ECN, see FWD-TSN processing.
*/
if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
send_forward_tsn(stcb, asoc);
} else if (lchk) {
/* try to FR fwd-tsn's that get lost too */
if (lchk->rec.data.fwd_tsn_cnt >= 3) {
send_forward_tsn(stcb, asoc);
}
}
}
if (lchk) {
/* Assure a timer is up */
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, lchk->whoTo);
}
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
rwnd,
stcb->asoc.peers_rwnd,
stcb->asoc.total_flight,
stcb->asoc.total_output_queue_size);
}
}
void
sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
struct sctp_tcb *stcb,
uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
int *abort_now, uint8_t flags,
uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *tp1, *tp2;
uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
uint16_t wake_him = 0;
uint32_t send_s = 0;
long j;
int accum_moved = 0;
int will_exit_fast_recovery = 0;
uint32_t a_rwnd, old_rwnd;
int win_probe_recovery = 0;
int win_probe_recovered = 0;
struct sctp_nets *net = NULL;
int done_once;
int rto_ok = 1;
uint8_t reneged_all = 0;
uint8_t cmt_dac_flag;
/*
* we take any chance we can to service our queues since we cannot
* get awoken when the socket is read from :<
*/
/*
* Now perform the actual SACK handling: 1) Verify that it is not an
* old sack, if so discard. 2) If there is nothing left in the send
* queue (cum-ack is equal to last acked) then you have a duplicate
* too, update any rwnd change and verify no timers are running.
* then return. 3) Process any new consequtive data i.e. cum-ack
* moved process these first and note that it moved. 4) Process any
* sack blocks. 5) Drop any acked from the queue. 6) Check for any
* revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
* sync up flightsizes and things, stop all timers and also check
* for shutdown_pending state. If so then go ahead and send off the
* shutdown. If in shutdown recv, send off the shutdown-ack and
* start that timer, Ret. 9) Strike any non-acked things and do FR
* procedure if needed being sure to set the FR flag. 10) Do pr-sctp
* procedures. 11) Apply any FR penalties. 12) Assure we will SACK
* if in shutdown_recv state.
*/
SCTP_TCB_LOCK_ASSERT(stcb);
/* CMT DAC algo */
this_sack_lowest_newack = 0;
SCTP_STAT_INCR(sctps_slowpath_sack);
last_tsn = cum_ack;
cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
#ifdef SCTP_ASOCLOG_OF_TSNS
stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
stcb->asoc.cumack_log_at++;
if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
stcb->asoc.cumack_log_at = 0;
}
#endif
a_rwnd = rwnd;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
}
old_rwnd = stcb->asoc.peers_rwnd;
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_INDATA,
__LINE__);
}
stcb->asoc.overall_error_count = 0;
asoc = &stcb->asoc;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(asoc->last_acked_seq,
cum_ack,
0,
num_seg,
num_dup,
SCTP_LOG_NEW_SACK);
}
if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
uint16_t i;
uint32_t *dupdata, dblock;
for (i = 0; i < num_dup; i++) {
dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
sizeof(uint32_t), (uint8_t *) & dblock);
if (dupdata == NULL) {
break;
}
sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
}
}
if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
/* reality check */
if (!TAILQ_EMPTY(&asoc->sent_queue)) {
tp1 = TAILQ_LAST(&asoc->sent_queue,
sctpchunk_listhead);
send_s = tp1->rec.data.TSN_seq + 1;
} else {
tp1 = NULL;
send_s = asoc->sending_seq;
}
if (SCTP_TSN_GE(cum_ack, send_s)) {
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
/*
* no way, we have not even sent this TSN out yet.
* Peer is hopelessly messed up with us.
*/
SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
cum_ack, send_s);
if (tp1) {
SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n",
tp1->rec.data.TSN_seq, (void *)tp1);
}
hopeless_peer:
*abort_now = 1;
/* XXX */
snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x",
cum_ack, send_s);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
return;
}
}
/**********************/
/* 1) check the range */
/**********************/
if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
/* acking something behind */
return;
}
/* update the Rwnd of the peer */
if (TAILQ_EMPTY(&asoc->sent_queue) &&
TAILQ_EMPTY(&asoc->send_queue) &&
(asoc->stream_queue_cnt == 0)) {
/* nothing left on send/sent and strmq */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
asoc->peers_rwnd, 0, 0, a_rwnd);
}
asoc->peers_rwnd = a_rwnd;
if (asoc->sent_queue_retran_cnt) {
asoc->sent_queue_retran_cnt = 0;
}
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
/* stop any timers */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
net->partial_bytes_acked = 0;
net->flight_size = 0;
}
asoc->total_flight = 0;
asoc->total_flight_count = 0;
return;
}
/*
* We init netAckSz and netAckSz2 to 0. These are used to track 2
* things. The total byte count acked is tracked in netAckSz AND
* netAck2 is used to track the total bytes acked that are un-
* amibguious and were never retransmitted. We track these on a per
* destination address basis.
*/
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
/* Drag along the window_tsn for cwr's */
net->cwr_window_tsn = cum_ack;
}
net->prev_cwnd = net->cwnd;
net->net_ack = 0;
net->net_ack2 = 0;
/*
* CMT: Reset CUC and Fast recovery algo variables before
* SACK processing
*/
net->new_pseudo_cumack = 0;
net->will_exit_fast_recovery = 0;
if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
(*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
}
}
/* process the new consecutive TSN first */
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
accum_moved = 1;
if (tp1->sent < SCTP_DATAGRAM_ACKED) {
/*
* If it is less than ACKED, it is
* now no-longer in flight. Higher
* values may occur during marking
*/
if ((tp1->whoTo->dest_state &
SCTP_ADDR_UNCONFIRMED) &&
(tp1->snd_count < 2)) {
/*
* If there was no retran
* and the address is
* un-confirmed and we sent
* there and are now
* sacked.. its confirmed,
* mark it so.
*/
tp1->whoTo->dest_state &=
~SCTP_ADDR_UNCONFIRMED;
}
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, tp1);
if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
tp1);
}
}
tp1->whoTo->net_ack += tp1->send_size;
/* CMT SFR and DAC algos */
this_sack_lowest_newack = tp1->rec.data.TSN_seq;
tp1->whoTo->saw_newack = 1;
if (tp1->snd_count < 2) {
/*
* True non-retransmited
* chunk
*/
tp1->whoTo->net_ack2 +=
tp1->send_size;
/* update RTO too? */
if (tp1->do_rtt) {
if (rto_ok) {
tp1->whoTo->RTO =
sctp_calculate_rto(stcb,
asoc, tp1->whoTo,
&tp1->sent_rcv_time,
sctp_align_safe_nocopy,
SCTP_RTT_FROM_DATA);
rto_ok = 0;
}
if (tp1->whoTo->rto_needed == 0) {
tp1->whoTo->rto_needed = 1;
}
tp1->do_rtt = 0;
}
}
/*
* CMT: CUCv2 algorithm. From the
* cumack'd TSNs, for each TSN being
* acked for the first time, set the
* following variables for the
* corresp destination.
* new_pseudo_cumack will trigger a
* cwnd update.
* find_(rtx_)pseudo_cumack will
* trigger search for the next
* expected (rtx-)pseudo-cumack.
*/
tp1->whoTo->new_pseudo_cumack = 1;
tp1->whoTo->find_pseudo_cumack = 1;
tp1->whoTo->find_rtx_pseudo_cumack = 1;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(asoc->last_acked_seq,
cum_ack,
tp1->rec.data.TSN_seq,
0,
0,
SCTP_LOG_TSN_ACKED);
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
}
}
if (tp1->sent == SCTP_DATAGRAM_RESEND) {
sctp_ucount_decr(asoc->sent_queue_retran_cnt);
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xB3,
(asoc->sent_queue_retran_cnt & 0x000000ff));
#endif
}
if (tp1->rec.data.chunk_was_revoked) {
/* deflate the cwnd */
tp1->whoTo->cwnd -= tp1->book_size;
tp1->rec.data.chunk_was_revoked = 0;
}
if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
tp1->sent = SCTP_DATAGRAM_ACKED;
}
}
} else {
break;
}
}
biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
/* always set this up to cum-ack */
asoc->this_sack_highest_gap = last_tsn;
if ((num_seg > 0) || (num_nr_seg > 0)) {
/*
* CMT: SFR algo (and HTNA) - this_sack_highest_newack has
* to be greater than the cumack. Also reset saw_newack to 0
* for all dests.
*/
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
net->saw_newack = 0;
net->this_sack_highest_newack = last_tsn;
}
/*
* thisSackHighestGap will increase while handling NEW
* segments this_sack_highest_newack will increase while
* handling NEWLY ACKED chunks. this_sack_lowest_newack is
* used for CMT DAC algo. saw_newack will also change.
*/
if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
&biggest_tsn_newly_acked, &this_sack_lowest_newack,
num_seg, num_nr_seg, &rto_ok)) {
wake_him++;
}
if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
/*
* validate the biggest_tsn_acked in the gap acks if
* strict adherence is wanted.
*/
if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
/*
* peer is either confused or we are under
* attack. We must abort.
*/
SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
biggest_tsn_acked, send_s);
goto hopeless_peer;
}
}
}
/*******************************************/
/* cancel ALL T3-send timer if accum moved */
/*******************************************/
if (asoc->sctp_cmt_on_off > 0) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (net->new_pseudo_cumack)
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
}
} else {
if (accum_moved) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
}
}
}
/********************************************/
/* drop the acked chunks from the sentqueue */
/********************************************/
asoc->last_acked_seq = cum_ack;
TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
break;
}
if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
#ifdef INVARIANTS
} else {
panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
#endif
}
}
if ((asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues == 0) &&
(asoc->strmout[tp1->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
TAILQ_EMPTY(&asoc->strmout[tp1->rec.data.stream_number].outqueue)) {
asoc->trigger_reset = 1;
}
TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
if (PR_SCTP_ENABLED(tp1->flags)) {
if (asoc->pr_sctp_cnt != 0)
asoc->pr_sctp_cnt--;
}
asoc->sent_queue_cnt--;
if (tp1->data) {
/* sa_ignore NO_NULL_CHK */
sctp_free_bufspace(stcb, asoc, tp1, 1);
sctp_m_freem(tp1->data);
tp1->data = NULL;
if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) {
asoc->sent_queue_cnt_removeable--;
}
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
sctp_log_sack(asoc->last_acked_seq,
cum_ack,
tp1->rec.data.TSN_seq,
0,
0,
SCTP_LOG_FREE_SENT);
}
sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
wake_him++;
}
if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
#ifdef INVARIANTS
panic("Warning flight size is postive and should be 0");
#else
SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
asoc->total_flight);
#endif
asoc->total_flight = 0;
}
/* sa_ignore NO_NULL_CHK */
if ((wake_him) && (stcb->sctp_socket)) {
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
#endif
SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
}
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/* assoc was freed while we were unlocked */
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
} else {
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
}
}
if (asoc->fast_retran_loss_recovery && accum_moved) {
if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
/* Setup so we will exit RFC2582 fast recovery */
will_exit_fast_recovery = 1;
}
}
/*
* Check for revoked fragments:
*
* if Previous sack - Had no frags then we can't have any revoked if
* Previous sack - Had frag's then - If we now have frags aka
* num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
* some of them. else - The peer revoked all ACKED fragments, since
* we had some before and now we have NONE.
*/
if (num_seg) {
sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
asoc->saw_sack_with_frags = 1;
} else if (asoc->saw_sack_with_frags) {
int cnt_revoked = 0;
/* Peer revoked all dg's marked or acked */
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (tp1->sent == SCTP_DATAGRAM_ACKED) {
tp1->sent = SCTP_DATAGRAM_SENT;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
tp1->whoTo->flight_size,
tp1->book_size,
(uint32_t) (uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_increase(tp1);
sctp_total_flight_increase(stcb, tp1);
tp1->rec.data.chunk_was_revoked = 1;
/*
* To ensure that this increase in
* flightsize, which is artificial, does not
* throttle the sender, we also increase the
* cwnd artificially.
*/
tp1->whoTo->cwnd += tp1->book_size;
cnt_revoked++;
}
}
if (cnt_revoked) {
reneged_all = 1;
}
asoc->saw_sack_with_frags = 0;
}
if (num_nr_seg > 0)
asoc->saw_sack_with_nr_frags = 1;
else
asoc->saw_sack_with_nr_frags = 0;
/* JRS - Use the congestion control given in the CC module */
if (ecne_seen == 0) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (net->net_ack2 > 0) {
/*
* Karn's rule applies to clearing error
* count, this is optional.
*/
net->error_count = 0;
if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
/* addr came good */
net->dest_state |= SCTP_ADDR_REACHABLE;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
0, (void *)net, SCTP_SO_NOT_LOCKED);
}
if (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;
}
}
if (net->dest_state & SCTP_ADDR_PF) {
net->dest_state &= ~SCTP_ADDR_PF;
sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_29);
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
/* Done with this net */
net->net_ack = 0;
}
/* restore any doubled timers */
net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
if (net->RTO < stcb->asoc.minrto) {
net->RTO = stcb->asoc.minrto;
}
if (net->RTO > stcb->asoc.maxrto) {
net->RTO = stcb->asoc.maxrto;
}
}
}
asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
}
if (TAILQ_EMPTY(&asoc->sent_queue)) {
/* nothing left in-flight */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
/* stop all timers */
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
net->flight_size = 0;
net->partial_bytes_acked = 0;
}
asoc->total_flight = 0;
asoc->total_flight_count = 0;
}
/**********************************/
/* Now what about shutdown issues */
/**********************************/
if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
/* nothing left on sendqueue.. consider done */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
asoc->peers_rwnd, 0, 0, a_rwnd);
}
asoc->peers_rwnd = a_rwnd;
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
/* clean up */
if ((asoc->stream_queue_cnt == 1) &&
((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
(asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
(asoc->locked_on_sending)
) {
struct sctp_stream_queue_pending *sp;
/*
* I may be in a state where we got all across.. but
* cannot write more due to a shutdown... we abort
* since the user did not indicate EOR in this case.
*/
sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
sctp_streamhead);
if ((sp) && (sp->length == 0)) {
asoc->locked_on_sending = NULL;
if (sp->msg_is_complete) {
asoc->stream_queue_cnt--;
} else {
asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
asoc->stream_queue_cnt--;
}
}
}
if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
(asoc->stream_queue_cnt == 0)) {
if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
/* Need to abort here */
struct mbuf *op_err;
abort_out_now:
*abort_now = 1;
/* XXX */
op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
return;
} else {
struct sctp_nets *netp;
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
sctp_stop_timers_for_shutdown(stcb);
if (asoc->alternate) {
netp = asoc->alternate;
} else {
netp = asoc->primary_destination;
}
sctp_send_shutdown(stcb, netp);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
stcb->sctp_ep, stcb, netp);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, netp);
}
return;
} else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
(asoc->stream_queue_cnt == 0)) {
struct sctp_nets *netp;
if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
goto abort_out_now;
}
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
sctp_stop_timers_for_shutdown(stcb);
if (asoc->alternate) {
netp = asoc->alternate;
} else {
netp = asoc->primary_destination;
}
sctp_send_shutdown_ack(stcb, netp);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
stcb->sctp_ep, stcb, netp);
return;
}
}
/*
* Now here we are going to recycle net_ack for a different use...
* HEADS UP.
*/
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
net->net_ack = 0;
}
/*
* CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
* to be done. Setting this_sack_lowest_newack to the cum_ack will
* automatically ensure that.
*/
if ((asoc->sctp_cmt_on_off > 0) &&
SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
(cmt_dac_flag == 0)) {
this_sack_lowest_newack = cum_ack;
}
if ((num_seg > 0) || (num_nr_seg > 0)) {
sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
}
/* JRS - Use the congestion control given in the CC module */
asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
/* Now are we exiting loss recovery ? */
if (will_exit_fast_recovery) {
/* Ok, we must exit fast recovery */
asoc->fast_retran_loss_recovery = 0;
}
if ((asoc->sat_t3_loss_recovery) &&
SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
/* end satellite t3 loss recovery */
asoc->sat_t3_loss_recovery = 0;
}
/*
* CMT Fast recovery
*/
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (net->will_exit_fast_recovery) {
/* Ok, we must exit fast recovery */
net->fast_retran_loss_recovery = 0;
}
}
/* Adjust and set the new rwnd value */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
}
asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
(uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
if (asoc->peers_rwnd > old_rwnd) {
win_probe_recovery = 1;
}
/*
* Now we must setup so we have a timer up for anyone with
* outstanding data.
*/
done_once = 0;
again:
j = 0;
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (win_probe_recovery && (net->window_probe)) {
win_probe_recovered = 1;
/*-
* Find first chunk that was used with
* window probe and clear the event. Put
* it back into the send queue as if has
* not been sent.
*/
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (tp1->window_probe) {
sctp_window_probe_recovery(stcb, asoc, tp1);
break;
}
}
}
if (net->flight_size) {
j++;
if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, net);
}
if (net->window_probe) {
net->window_probe = 0;
}
} else {
if (net->window_probe) {
/*
* In window probes we must assure a timer
* is still running there
*/
if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, net);
}
} else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
}
}
}
if ((j == 0) &&
(!TAILQ_EMPTY(&asoc->sent_queue)) &&
(asoc->sent_queue_retran_cnt == 0) &&
(win_probe_recovered == 0) &&
(done_once == 0)) {
/*
* huh, this should not happen unless all packets are
* PR-SCTP and marked to skip of course.
*/
if (sctp_fs_audit(asoc)) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
net->flight_size = 0;
}
asoc->total_flight = 0;
asoc->total_flight_count = 0;
asoc->sent_queue_retran_cnt = 0;
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if (tp1->sent < SCTP_DATAGRAM_RESEND) {
sctp_flight_size_increase(tp1);
sctp_total_flight_increase(stcb, tp1);
} else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
sctp_ucount_incr(asoc->sent_queue_retran_cnt);
}
}
}
done_once = 1;
goto again;
}
/*********************************************/
/* Here we perform PR-SCTP procedures */
/* (section 4.2) */
/*********************************************/
/* C1. update advancedPeerAckPoint */
if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
asoc->advanced_peer_ack_point = cum_ack;
}
/* C2. try to further move advancedPeerAckPoint ahead */
if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
struct sctp_tmit_chunk *lchk;
uint32_t old_adv_peer_ack_point;
old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
/* C3. See if we need to send a Fwd-TSN */
if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
/*
* ISSUE with ECN, see FWD-TSN processing.
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
sctp_misc_ints(SCTP_FWD_TSN_CHECK,
0xee, cum_ack, asoc->advanced_peer_ack_point,
old_adv_peer_ack_point);
}
if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
send_forward_tsn(stcb, asoc);
} else if (lchk) {
/* try to FR fwd-tsn's that get lost too */
if (lchk->rec.data.fwd_tsn_cnt >= 3) {
send_forward_tsn(stcb, asoc);
}
}
}
if (lchk) {
/* Assure a timer is up */
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, lchk->whoTo);
}
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
a_rwnd,
stcb->asoc.peers_rwnd,
stcb->asoc.total_flight,
stcb->asoc.total_output_queue_size);
}
}
void
sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
{
/* Copy cum-ack */
uint32_t cum_ack, a_rwnd;
cum_ack = ntohl(cp->cumulative_tsn_ack);
/* Arrange so a_rwnd does NOT change */
a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
/* Now call the express sack handling */
sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
}
static void
sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
struct sctp_stream_in *strmin)
{
struct sctp_queued_to_read *ctl, *nctl;
struct sctp_association *asoc;
uint32_t tt;
int need_reasm_check = 0, old;
asoc = &stcb->asoc;
tt = strmin->last_sequence_delivered;
if (asoc->idata_supported) {
old = 0;
} else {
old = 1;
}
/*
* First deliver anything prior to and including the stream no that
* came in.
*/
TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next_instrm, nctl) {
if (SCTP_MSGID_GE(old, tt, ctl->sinfo_ssn)) {
/* this is deliverable now */
if (((ctl->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
if (ctl->on_strm_q) {
if (ctl->on_strm_q == SCTP_ON_ORDERED) {
TAILQ_REMOVE(&strmin->inqueue, ctl, next_instrm);
} else if (ctl->on_strm_q == SCTP_ON_UNORDERED) {
TAILQ_REMOVE(&strmin->uno_inqueue, ctl, next_instrm);
} else {
panic("strmin:%p ctl:%p unknown %d",
strmin, ctl, ctl->on_strm_q);
}
ctl->on_strm_q = 0;
}
/* subtract pending on streams */
asoc->size_on_all_streams -= ctl->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
/* deliver it to at least the delivery-q */
if (stcb->sctp_socket) {
sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
ctl,
&stcb->sctp_socket->so_rcv,
1, SCTP_READ_LOCK_HELD,
SCTP_SO_NOT_LOCKED);
}
} else {
/* Its a fragmented message */
if (ctl->first_frag_seen) {
/*
* Make it so this is next to
* deliver, we restore later
*/
strmin->last_sequence_delivered = ctl->sinfo_ssn - 1;
need_reasm_check = 1;
break;
}
}
} else {
/* no more delivery now. */
break;
}
}
if (need_reasm_check) {
int ret;
ret = sctp_deliver_reasm_check(stcb, &stcb->asoc, strmin);
if (SCTP_MSGID_GT(old, tt, strmin->last_sequence_delivered)) {
/* Restore the next to deliver unless we are ahead */
strmin->last_sequence_delivered = tt;
}
if (ret == 0) {
/* Left the front Partial one on */
return;
}
need_reasm_check = 0;
}
/*
* now we must deliver things in queue the normal way if any are
* now ready.
*/
tt = strmin->last_sequence_delivered + 1;
TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next_instrm, nctl) {
if (tt == ctl->sinfo_ssn) {
if (((ctl->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
/* this is deliverable now */
if (ctl->on_strm_q) {
if (ctl->on_strm_q == SCTP_ON_ORDERED) {
TAILQ_REMOVE(&strmin->inqueue, ctl, next_instrm);
} else if (ctl->on_strm_q == SCTP_ON_UNORDERED) {
TAILQ_REMOVE(&strmin->uno_inqueue, ctl, next_instrm);
} else {
panic("strmin:%p ctl:%p unknown %d",
strmin, ctl, ctl->on_strm_q);
}
ctl->on_strm_q = 0;
}
/* subtract pending on streams */
asoc->size_on_all_streams -= ctl->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
/* deliver it to at least the delivery-q */
strmin->last_sequence_delivered = ctl->sinfo_ssn;
if (stcb->sctp_socket) {
sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
ctl,
&stcb->sctp_socket->so_rcv, 1,
SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
}
tt = strmin->last_sequence_delivered + 1;
} else {
/* Its a fragmented message */
if (ctl->first_frag_seen) {
/*
* Make it so this is next to
* deliver
*/
strmin->last_sequence_delivered = ctl->sinfo_ssn - 1;
need_reasm_check = 1;
break;
}
}
} else {
break;
}
}
if (need_reasm_check) {
(void)sctp_deliver_reasm_check(stcb, &stcb->asoc, strmin);
}
}
static void
sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
struct sctp_association *asoc,
uint16_t stream, uint32_t seq)
{
struct sctp_queued_to_read *control;
struct sctp_stream_in *strm;
struct sctp_tmit_chunk *chk, *nchk;
/*
* For now large messages held on the stream reasm that are complete
* will be tossed too. We could in theory do more work to spin
* through and stop after dumping one msg aka seeing the start of a
* new msg at the head, and call the delivery function... to see if
* it can be delivered... But for now we just dump everything on the
* queue.
*/
strm = &asoc->strmin[stream];
control = find_reasm_entry(strm, (uint32_t) seq, 0, 0);
if (control == NULL) {
/* Not found */
return;
}
TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
/* Purge hanging chunks */
TAILQ_REMOVE(&control->reasm, chk, sctp_next);
asoc->size_on_reasm_queue -= chk->send_size;
sctp_ucount_decr(asoc->cnt_on_reasm_queue);
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
}
TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
if (control->on_read_q == 0) {
sctp_free_remote_addr(control->whoFrom);
if (control->data) {
sctp_m_freem(control->data);
control->data = NULL;
}
sctp_free_a_readq(stcb, control);
}
}
void
sctp_handle_forward_tsn(struct sctp_tcb *stcb,
struct sctp_forward_tsn_chunk *fwd,
int *abort_flag, struct mbuf *m, int offset)
{
/* The pr-sctp fwd tsn */
/*
* here we will perform all the data receiver side steps for
* processing FwdTSN, as required in by pr-sctp draft:
*
* Assume we get FwdTSN(x):
*
* 1) update local cumTSN to x 2) try to further advance cumTSN to x +
* others we have 3) examine and update re-ordering queue on
* pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
* report where we are.
*/
struct sctp_association *asoc;
uint32_t new_cum_tsn, gap;
unsigned int i, fwd_sz, m_size;
uint32_t str_seq;
struct sctp_stream_in *strm;
struct sctp_queued_to_read *ctl, *sv;
asoc = &stcb->asoc;
if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
SCTPDBG(SCTP_DEBUG_INDATA1,
"Bad size too small/big fwd-tsn\n");
return;
}
m_size = (stcb->asoc.mapping_array_size << 3);
/*************************************************************/
/* 1. Here we update local cumTSN and shift the bitmap array */
/*************************************************************/
new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
/* Already got there ... */
return;
}
/*
* now we know the new TSN is more advanced, let's find the actual
* gap
*/
SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
asoc->cumulative_tsn = new_cum_tsn;
if (gap >= m_size) {
if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
struct mbuf *op_err;
char msg[SCTP_DIAG_INFO_LEN];
/*
* out of range (of single byte chunks in the rwnd I
* give out). This must be an attacker.
*/
*abort_flag = 1;
snprintf(msg, sizeof(msg),
"New cum ack %8.8x too high, highest TSN %8.8x",
new_cum_tsn, asoc->highest_tsn_inside_map);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
return;
}
SCTP_STAT_INCR(sctps_fwdtsn_map_over);
memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
asoc->mapping_array_base_tsn = new_cum_tsn + 1;
asoc->highest_tsn_inside_map = new_cum_tsn;
memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
asoc->highest_tsn_inside_nr_map = new_cum_tsn;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
} else {
SCTP_TCB_LOCK_ASSERT(stcb);
for (i = 0; i <= gap; i++) {
if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
!SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
}
}
}
}
/*************************************************************/
/* 2. Clear up re-assembly queue */
/*************************************************************/
/* This is now done as part of clearing up the stream/seq */
/*******************************************************/
/* 3. Update the PR-stream re-ordering queues and fix */
/* delivery issues as needed. */
/*******************************************************/
fwd_sz -= sizeof(*fwd);
if (m && fwd_sz) {
/* New method. */
unsigned int num_str;
uint32_t sequence;
uint16_t stream;
int old;
struct sctp_strseq *stseq, strseqbuf;
struct sctp_strseq_mid *stseq_m, strseqbuf_m;
offset += sizeof(*fwd);
SCTP_INP_READ_LOCK(stcb->sctp_ep);
if (asoc->idata_supported) {
num_str = fwd_sz / sizeof(struct sctp_strseq_mid);
old = 0;
} else {
num_str = fwd_sz / sizeof(struct sctp_strseq);
old = 1;
}
for (i = 0; i < num_str; i++) {
if (asoc->idata_supported) {
stseq_m = (struct sctp_strseq_mid *)sctp_m_getptr(m, offset,
sizeof(struct sctp_strseq_mid),
(uint8_t *) & strseqbuf_m);
offset += sizeof(struct sctp_strseq_mid);
if (stseq_m == NULL) {
break;
}
stream = ntohs(stseq_m->stream);
sequence = ntohl(stseq_m->msg_id);
} else {
stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
sizeof(struct sctp_strseq),
(uint8_t *) & strseqbuf);
offset += sizeof(struct sctp_strseq);
if (stseq == NULL) {
break;
}
stream = ntohs(stseq->stream);
sequence = (uint32_t) ntohs(stseq->sequence);
}
/* Convert */
/* now process */
/*
* Ok we now look for the stream/seq on the read
* queue where its not all delivered. If we find it
* we transmute the read entry into a PDI_ABORTED.
*/
if (stream >= asoc->streamincnt) {
/* screwed up streams, stop! */
break;
}
if ((asoc->str_of_pdapi == stream) &&
(asoc->ssn_of_pdapi == sequence)) {
/*
* If this is the one we were partially
* delivering now then we no longer are.
* Note this will change with the reassembly
* re-write.
*/
asoc->fragmented_delivery_inprogress = 0;
}
strm = &asoc->strmin[stream];
sctp_flush_reassm_for_str_seq(stcb, asoc, stream, sequence);
TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
if ((ctl->sinfo_stream == stream) &&
(ctl->sinfo_ssn == sequence)) {
str_seq = (stream << 16) | (0x0000ffff & sequence);
ctl->pdapi_aborted = 1;
sv = stcb->asoc.control_pdapi;
ctl->end_added = 1;
if (ctl->on_strm_q == SCTP_ON_ORDERED) {
TAILQ_REMOVE(&strm->inqueue, ctl, next_instrm);
} else if (ctl->on_strm_q == SCTP_ON_UNORDERED) {
TAILQ_REMOVE(&strm->uno_inqueue, ctl, next_instrm);
} else if (ctl->on_strm_q) {
panic("strm:%p ctl:%p unknown %d",
strm, ctl, ctl->on_strm_q);
}
ctl->on_strm_q = 0;
stcb->asoc.control_pdapi = ctl;
sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
stcb,
SCTP_PARTIAL_DELIVERY_ABORTED,
(void *)&str_seq,
SCTP_SO_NOT_LOCKED);
stcb->asoc.control_pdapi = sv;
break;
} else if ((ctl->sinfo_stream == stream) &&
SCTP_MSGID_GT(old, ctl->sinfo_ssn, sequence)) {
/* We are past our victim SSN */
break;
}
}
if (SCTP_MSGID_GT(old, sequence, strm->last_sequence_delivered)) {
/* Update the sequence number */
strm->last_sequence_delivered = sequence;
}
/* now kick the stream the new way */
/* sa_ignore NO_NULL_CHK */
sctp_kick_prsctp_reorder_queue(stcb, strm);
}
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
}
/*
* Now slide thing forward.
*/
sctp_slide_mapping_arrays(stcb);
}
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