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78f3413f0c
freebsd/sys/netinet/sctp_indata.c
Randall Stewart 671d309c7c - Fix stream reset so it limits the number of streams that can be listed 
- Fix fwd-tsn to use proper accessor so it does not overrun mbufs
- Fix stream reset error reporting to actually work (it has always been
  broken if the peer rejects a stream reset)
- Some 64 bit friendly changes

Approved by:	re(bmah@freebsd.org)
2007-06-22 13:50:56 +00:00

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/*-
* Copyright (c) 2001-2007, by Cisco Systems, Inc. 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.
*/
/* $KAME: sctp_indata.c,v 1.36 2005/03/06 16:04:17 itojun Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <netinet/sctp_os.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_timer.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.
*/
void
sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
uint32_t calc, calc_w_oh;
/*
* 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;
if (stcb->asoc.sb_cc == 0 &&
asoc->size_on_reasm_queue == 0 &&
asoc->size_on_all_streams == 0) {
/* Full rwnd granted */
asoc->my_rwnd = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
SCTP_MINIMAL_RWND);
return;
}
/* 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);
calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams);
if (calc == 0) {
/* out of space */
asoc->my_rwnd = 0;
return;
}
/* what is the overhead of all these rwnd's */
calc_w_oh = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
asoc->my_rwnd = calc;
if (calc_w_oh == 0) {
/*
* If our overhead is greater than the advertised rwnd, we
* clamp the rwnd to 1. This lets us still accept inbound
* segments, but hopefully will shut the sender down when he
* finally gets the message.
*/
asoc->my_rwnd = 1;
} else {
/* SWS threshold */
if (asoc->my_rwnd &&
(asoc->my_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_receiver)) {
/* SWS engaged, tell peer none left */
asoc->my_rwnd = 1;
}
}
}
/* Calculate what the rwnd would be */
uint32_t
sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
uint32_t calc = 0, calc_w_oh;
/*
* 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);
calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams);
if (calc == 0) {
/* out of space */
return (calc);
}
/* what is the overhead of all these rwnd's */
calc_w_oh = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
if (calc_w_oh == 0) {
/*
* If our overhead is greater than the advertised rwnd, we
* clamp the rwnd to 1. This lets us still accept inbound
* segments, but hopefully will shut the sender down when he
* finally gets the message.
*/
calc = 1;
} else {
/* SWS threshold */
if (calc &&
(calc < stcb->sctp_ep->sctp_ep.sctp_sws_receiver)) {
/* SWS engaged, tell peer none left */
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,
uint16_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;
}
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 = stcb->asoc.context;
read_queue_e->sinfo_timetolive = 0;
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->whoFrom = net;
read_queue_e->length = 0;
atomic_add_int(&net->ref_count, 1);
read_queue_e->data = dm;
read_queue_e->spec_flags = 0;
read_queue_e->tail_mbuf = NULL;
read_queue_e->aux_data = NULL;
read_queue_e->stcb = stcb;
read_queue_e->port_from = stcb->rport;
read_queue_e->do_not_ref_stcb = 0;
read_queue_e->end_added = 0;
read_queue_e->some_taken = 0;
read_queue_e->pdapi_aborted = 0;
failed_build:
return (read_queue_e);
}
/*
* Build out our readq entry based on the incoming packet.
*/
static struct sctp_queued_to_read *
sctp_build_readq_entry_chk(struct sctp_tcb *stcb,
struct sctp_tmit_chunk *chk)
{
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;
}
read_queue_e->sinfo_stream = chk->rec.data.stream_number;
read_queue_e->sinfo_ssn = chk->rec.data.stream_seq;
read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8);
read_queue_e->sinfo_ppid = chk->rec.data.payloadtype;
read_queue_e->sinfo_context = stcb->asoc.context;
read_queue_e->sinfo_timetolive = 0;
read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq;
read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq;
read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
read_queue_e->whoFrom = chk->whoTo;
read_queue_e->aux_data = NULL;
read_queue_e->length = 0;
atomic_add_int(&chk->whoTo->ref_count, 1);
read_queue_e->data = chk->data;
read_queue_e->tail_mbuf = NULL;
read_queue_e->stcb = stcb;
read_queue_e->port_from = stcb->rport;
read_queue_e->spec_flags = 0;
read_queue_e->do_not_ref_stcb = 0;
read_queue_e->end_added = 0;
read_queue_e->some_taken = 0;
read_queue_e->pdapi_aborted = 0;
failed_build:
return (read_queue_e);
}
struct mbuf *
sctp_build_ctl_nchunk(struct sctp_inpcb *inp,
struct sctp_sndrcvinfo *sinfo)
{
struct sctp_sndrcvinfo *outinfo;
struct cmsghdr *cmh;
struct mbuf *ret;
int len;
int use_extended = 0;
if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
/* user does not want the sndrcv ctl */
return (NULL);
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
use_extended = 1;
len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
} else {
len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
}
ret = sctp_get_mbuf_for_msg(len,
0, M_DONTWAIT, 1, MT_DATA);
if (ret == NULL) {
/* No space */
return (ret);
}
/* We need a CMSG header followed by the struct */
cmh = mtod(ret, struct cmsghdr *);
outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
cmh->cmsg_level = IPPROTO_SCTP;
if (use_extended) {
cmh->cmsg_type = SCTP_EXTRCV;
cmh->cmsg_len = len;
memcpy(outinfo, sinfo, len);
} else {
cmh->cmsg_type = SCTP_SNDRCV;
cmh->cmsg_len = len;
*outinfo = *sinfo;
}
SCTP_BUF_LEN(ret) = cmh->cmsg_len;
return (ret);
}
char *
sctp_build_ctl_cchunk(struct sctp_inpcb *inp,
int *control_len,
struct sctp_sndrcvinfo *sinfo)
{
struct sctp_sndrcvinfo *outinfo;
struct cmsghdr *cmh;
char *buf;
int len;
int use_extended = 0;
if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
/* user does not want the sndrcv ctl */
return (NULL);
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
use_extended = 1;
len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
} else {
len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
}
SCTP_MALLOC(buf, char *, len, SCTP_M_CMSG);
if (buf == NULL) {
/* No space */
return (buf);
}
/* We need a CMSG header followed by the struct */
cmh = (struct cmsghdr *)buf;
outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
cmh->cmsg_level = IPPROTO_SCTP;
if (use_extended) {
cmh->cmsg_type = SCTP_EXTRCV;
cmh->cmsg_len = len;
memcpy(outinfo, sinfo, len);
} else {
cmh->cmsg_type = SCTP_SNDRCV;
cmh->cmsg_len = len;
*outinfo = *sinfo;
}
*control_len = len;
return (buf);
}
/*
* We are delivering currently from the reassembly queue. We must continue to
* deliver until we either: 1) run out of space. 2) run out of sequential
* TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
*/
static void
sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
uint16_t nxt_todel;
uint16_t stream_no;
int end = 0;
int cntDel;
struct sctp_queued_to_read *control, *ctl, *ctlat;
if (stcb == NULL)
return;
cntDel = stream_no = 0;
if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
/* socket above is long gone */
asoc->fragmented_delivery_inprogress = 0;
chk = TAILQ_FIRST(&asoc->reasmqueue);
while (chk) {
TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
asoc->size_on_reasm_queue -= chk->send_size;
sctp_ucount_decr(asoc->cnt_on_reasm_queue);
/*
* Lose the data pointer, since its in the socket
* buffer
*/
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
/* Now free the address and data */
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
/* sa_ignore FREED_MEMORY */
chk = TAILQ_FIRST(&asoc->reasmqueue);
}
return;
}
SCTP_TCB_LOCK_ASSERT(stcb);
do {
chk = TAILQ_FIRST(&asoc->reasmqueue);
if (chk == NULL) {
return;
}
if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
/* Can't deliver more :< */
return;
}
stream_no = chk->rec.data.stream_number;
nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
if (nxt_todel != chk->rec.data.stream_seq &&
(chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
/*
* Not the next sequence to deliver in its stream OR
* unordered
*/
return;
}
if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
control = sctp_build_readq_entry_chk(stcb, chk);
if (control == NULL) {
/* out of memory? */
return;
}
/* save it off for our future deliveries */
stcb->asoc.control_pdapi = control;
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
end = 1;
else
end = 0;
sctp_add_to_readq(stcb->sctp_ep,
stcb, control, &stcb->sctp_socket->so_rcv, end);
cntDel++;
} else {
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
end = 1;
else
end = 0;
if (sctp_append_to_readq(stcb->sctp_ep, stcb,
stcb->asoc.control_pdapi,
chk->data, end, chk->rec.data.TSN_seq,
&stcb->sctp_socket->so_rcv)) {
/*
* something is very wrong, either
* control_pdapi is NULL, or the tail_mbuf
* is corrupt, or there is a EOM already on
* the mbuf chain.
*/
if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
panic("This should not happen control_pdapi NULL?");
}
/* if we did not panic, it was a EOM */
panic("Bad chunking ??");
return;
}
cntDel++;
}
/* pull it we did it */
TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
asoc->fragmented_delivery_inprogress = 0;
if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
asoc->strmin[stream_no].last_sequence_delivered++;
}
if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
}
} else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
/*
* turn the flag back on since we just delivered
* yet another one.
*/
asoc->fragmented_delivery_inprogress = 1;
}
asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
asoc->last_flags_delivered = chk->rec.data.rcv_flags;
asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
asoc->last_strm_no_delivered = chk->rec.data.stream_number;
asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
asoc->size_on_reasm_queue -= chk->send_size;
sctp_ucount_decr(asoc->cnt_on_reasm_queue);
/* free up the chk */
chk->data = NULL;
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
if (asoc->fragmented_delivery_inprogress == 0) {
/*
* Now lets see if we can deliver the next one on
* the stream
*/
struct sctp_stream_in *strm;
strm = &asoc->strmin[stream_no];
nxt_todel = strm->last_sequence_delivered + 1;
ctl = TAILQ_FIRST(&strm->inqueue);
if (ctl && (nxt_todel == ctl->sinfo_ssn)) {
while (ctl != NULL) {
/* Deliver more if we can. */
if (nxt_todel == ctl->sinfo_ssn) {
ctlat = TAILQ_NEXT(ctl, next);
TAILQ_REMOVE(&strm->inqueue, ctl, next);
asoc->size_on_all_streams -= ctl->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
strm->last_sequence_delivered++;
sctp_add_to_readq(stcb->sctp_ep, stcb,
ctl,
&stcb->sctp_socket->so_rcv, 1);
ctl = ctlat;
} else {
break;
}
nxt_todel = strm->last_sequence_delivered + 1;
}
}
break;
}
/* sa_ignore FREED_MEMORY */
chk = TAILQ_FIRST(&asoc->reasmqueue);
} while (chk);
}
/*
* 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. One big
* question still remains, what to do when the socket buffer is FULL??
*/
static void
sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
struct sctp_queued_to_read *control, int *abort_flag)
{
/*
* 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_stream_in *strm;
struct sctp_queued_to_read *at;
int queue_needed;
uint16_t nxt_todel;
struct mbuf *oper;
queue_needed = 1;
asoc->size_on_all_streams += control->length;
sctp_ucount_incr(asoc->cnt_on_all_streams);
strm = &asoc->strmin[control->sinfo_stream];
nxt_todel = strm->last_sequence_delivered + 1;
if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
}
SCTPDBG(SCTP_DEBUG_INDATA1,
"queue to stream called for ssn:%u lastdel:%u nxt:%u\n",
(uint32_t) control->sinfo_stream,
(uint32_t) strm->last_sequence_delivered,
(uint32_t) nxt_todel);
if (compare_with_wrap(strm->last_sequence_delivered,
control->sinfo_ssn, MAX_SEQ) ||
(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);
/*
* throw it in the stream so it gets cleaned up in
* association destruction
*/
TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
(sizeof(uint32_t) * 3);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1);
ippp++;
*ippp = control->sinfo_tsn;
ippp++;
*ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
if (nxt_todel == control->sinfo_ssn) {
/* can be delivered right away? */
if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
}
queue_needed = 0;
asoc->size_on_all_streams -= control->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
strm->last_sequence_delivered++;
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1);
control = TAILQ_FIRST(&strm->inqueue);
while (control != NULL) {
/* all delivered */
nxt_todel = strm->last_sequence_delivered + 1;
if (nxt_todel == control->sinfo_ssn) {
at = TAILQ_NEXT(control, next);
TAILQ_REMOVE(&strm->inqueue, control, next);
asoc->size_on_all_streams -= control->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
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_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL,
SCTP_STR_LOG_FROM_IMMED_DEL);
}
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1);
control = at;
continue;
}
break;
}
}
if (queue_needed) {
/*
* Ok, we did not deliver this guy, find the correct place
* to put it on the queue.
*/
if (TAILQ_EMPTY(&strm->inqueue)) {
/* Empty queue */
if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
}
TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
} else {
TAILQ_FOREACH(at, &strm->inqueue, next) {
if (compare_with_wrap(at->sinfo_ssn,
control->sinfo_ssn, MAX_SEQ)) {
/*
* one in queue is bigger than the
* new one, insert before this one
*/
if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, at,
SCTP_STR_LOG_FROM_INSERT_MD);
}
TAILQ_INSERT_BEFORE(at, control, next);
break;
} else if (at->sinfo_ssn == control->sinfo_ssn) {
/*
* 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!
*/
if (control->data)
sctp_m_freem(control->data);
control->data = NULL;
asoc->size_on_all_streams -= control->length;
sctp_ucount_decr(asoc->cnt_on_all_streams);
sctp_free_remote_addr(control->whoFrom);
sctp_free_a_readq(stcb, control);
return;
} else {
if (TAILQ_NEXT(at, next) == NULL) {
/*
* We are at the end, insert
* it after this one
*/
if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, at,
SCTP_STR_LOG_FROM_INSERT_TL);
}
TAILQ_INSERT_AFTER(&strm->inqueue,
at, control, next);
break;
}
}
}
}
}
}
/*
* Returns two things: You get the total size of the deliverable parts of the
* first fragmented message on the reassembly queue. And you get a 1 back if
* all of the message is ready or a 0 back if the message is still incomplete
*/
static int
sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size)
{
struct sctp_tmit_chunk *chk;
uint32_t tsn;
*t_size = 0;
chk = TAILQ_FIRST(&asoc->reasmqueue);
if (chk == NULL) {
/* nothing on the queue */
return (0);
}
if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
/* Not a first on the queue */
return (0);
}
tsn = chk->rec.data.TSN_seq;
while (chk) {
if (tsn != chk->rec.data.TSN_seq) {
return (0);
}
*t_size += chk->send_size;
if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
return (1);
}
tsn++;
chk = TAILQ_NEXT(chk, sctp_next);
}
return (0);
}
static void
sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
uint16_t nxt_todel;
uint32_t tsize;
doit_again:
chk = TAILQ_FIRST(&asoc->reasmqueue);
if (chk == NULL) {
/* Huh? */
asoc->size_on_reasm_queue = 0;
asoc->cnt_on_reasm_queue = 0;
return;
}
if (asoc->fragmented_delivery_inprogress == 0) {
nxt_todel =
asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
(nxt_todel == chk->rec.data.stream_seq ||
(chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
/*
* Yep the first one is here and its ok to deliver
* but should we?
*/
if ((sctp_is_all_msg_on_reasm(asoc, &tsize) ||
(tsize > stcb->sctp_ep->partial_delivery_point))) {
/*
* Yes, we setup to start reception, by
* backing down the TSN just in case we
* can't deliver. If we
*/
asoc->fragmented_delivery_inprogress = 1;
asoc->tsn_last_delivered =
chk->rec.data.TSN_seq - 1;
asoc->str_of_pdapi =
chk->rec.data.stream_number;
asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
asoc->pdapi_ppid = chk->rec.data.payloadtype;
asoc->fragment_flags = chk->rec.data.rcv_flags;
sctp_service_reassembly(stcb, asoc);
}
}
} else {
/*
* Service re-assembly will deliver stream data queued at
* the end of fragmented delivery.. but it wont know to go
* back and call itself again... we do that here with the
* got doit_again
*/
sctp_service_reassembly(stcb, asoc);
if (asoc->fragmented_delivery_inprogress == 0) {
/*
* finished our Fragmented delivery, could be more
* waiting?
*/
goto doit_again;
}
}
}
/*
* 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_tmit_chunk *chk, int *abort_flag)
{
struct mbuf *oper;
uint32_t cum_ackp1, last_tsn, prev_tsn, post_tsn;
u_char last_flags;
struct sctp_tmit_chunk *at, *prev, *next;
prev = next = NULL;
cum_ackp1 = asoc->tsn_last_delivered + 1;
if (TAILQ_EMPTY(&asoc->reasmqueue)) {
/* This is the first one on the queue */
TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
/*
* we do not check for delivery of anything when only one
* fragment is here
*/
asoc->size_on_reasm_queue = chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
if (chk->rec.data.TSN_seq == cum_ackp1) {
if (asoc->fragmented_delivery_inprogress == 0 &&
(chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
SCTP_DATA_FIRST_FRAG) {
/*
* An empty queue, no delivery inprogress,
* we hit the next one and it does NOT have
* a FIRST fragment mark.
*/
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(sizeof(uint32_t) * 3);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
} else if (asoc->fragmented_delivery_inprogress &&
(chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
/*
* We are doing a partial delivery and the
* NEXT chunk MUST be either the LAST or
* MIDDLE fragment NOT a FIRST
*/
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
} else if (asoc->fragmented_delivery_inprogress) {
/*
* Here we are ok with a MIDDLE or LAST
* piece
*/
if (chk->rec.data.stream_number !=
asoc->str_of_pdapi) {
/* Got to be the right STR No */
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
chk->rec.data.stream_number,
asoc->str_of_pdapi);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(sizeof(uint32_t) * 3);
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
} else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
SCTP_DATA_UNORDERED &&
chk->rec.data.stream_seq !=
asoc->ssn_of_pdapi) {
/* Got to be the right STR Seq */
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
chk->rec.data.stream_seq,
asoc->ssn_of_pdapi);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
}
}
}
return;
}
/* Find its place */
TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
if (compare_with_wrap(at->rec.data.TSN_seq,
chk->rec.data.TSN_seq, MAX_TSN)) {
/*
* one in queue is bigger than the new one, insert
* before this one
*/
/* A check */
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
next = at;
TAILQ_INSERT_BEFORE(at, chk, sctp_next);
break;
} else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
/* 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!
*/
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
return;
} else {
last_flags = at->rec.data.rcv_flags;
last_tsn = at->rec.data.TSN_seq;
prev = at;
if (TAILQ_NEXT(at, sctp_next) == NULL) {
/*
* We are at the end, insert it after this
* one
*/
/* check it first */
asoc->size_on_reasm_queue += chk->send_size;
sctp_ucount_incr(asoc->cnt_on_reasm_queue);
TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
break;
}
}
}
/* Now the audits */
if (prev) {
prev_tsn = chk->rec.data.TSN_seq - 1;
if (prev_tsn == prev->rec.data.TSN_seq) {
/*
* Ok the one I am dropping onto the end is the
* NEXT. A bit of valdiation here.
*/
if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_FIRST_FRAG ||
(prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_MIDDLE_FRAG) {
/*
* Insert chk MUST be a MIDDLE or LAST
* fragment
*/
if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_FIRST_FRAG) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
if (chk->rec.data.stream_number !=
prev->rec.data.stream_number) {
/*
* Huh, need the correct STR here,
* they must be the same.
*/
SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n",
chk->rec.data.stream_number,
prev->rec.data.stream_number);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
chk->rec.data.stream_seq !=
prev->rec.data.stream_seq) {
/*
* Huh, need the correct STR here,
* they must be the same.
*/
SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
chk->rec.data.stream_seq,
prev->rec.data.stream_seq);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
} else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_LAST_FRAG) {
/* Insert chk MUST be a FIRST */
if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
SCTP_DATA_FIRST_FRAG) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
}
}
}
if (next) {
post_tsn = chk->rec.data.TSN_seq + 1;
if (post_tsn == next->rec.data.TSN_seq) {
/*
* Ok the one I am inserting ahead of is my NEXT
* one. A bit of valdiation here.
*/
if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
/* Insert chk MUST be a last fragment */
if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
!= SCTP_DATA_LAST_FRAG) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
} else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_MIDDLE_FRAG ||
(next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_LAST_FRAG) {
/*
* Insert chk CAN be MIDDLE or FIRST NOT
* LAST
*/
if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
SCTP_DATA_LAST_FRAG) {
SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
if (chk->rec.data.stream_number !=
next->rec.data.stream_number) {
/*
* Huh, need the correct STR here,
* they must be the same.
*/
SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
chk->rec.data.stream_number,
next->rec.data.stream_number);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
chk->rec.data.stream_seq !=
next->rec.data.stream_seq) {
/*
* Huh, need the correct STR here,
* they must be the same.
*/
SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
chk->rec.data.stream_seq,
next->rec.data.stream_seq);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13);
ippp++;
*ippp = chk->rec.data.TSN_seq;
ippp++;
*ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return;
}
}
}
}
/* Do we need to do some delivery? check */
sctp_deliver_reasm_check(stcb, asoc);
}
/*
* This is an unfortunate routine. It checks to make sure a evil guy is not
* stuffing us full of bad packet fragments. A broken peer could also do this
* but this is doubtful. It is to bad I must worry about evil crackers sigh
* :< more cycles.
*/
static int
sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
uint32_t TSN_seq)
{
struct sctp_tmit_chunk *at;
uint32_t tsn_est;
TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
if (compare_with_wrap(TSN_seq,
at->rec.data.TSN_seq, MAX_TSN)) {
/* is it one bigger? */
tsn_est = at->rec.data.TSN_seq + 1;
if (tsn_est == TSN_seq) {
/* yep. It better be a last then */
if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
SCTP_DATA_LAST_FRAG) {
/*
* Ok this guy belongs next to a guy
* that is NOT last, it should be a
* middle/last, not a complete
* chunk.
*/
return (1);
} else {
/*
* This guy is ok since its a LAST
* and the new chunk is a fully
* self- contained one.
*/
return (0);
}
}
} else if (TSN_seq == at->rec.data.TSN_seq) {
/* Software error since I have a dup? */
return (1);
} else {
/*
* Ok, 'at' is larger than new chunk but does it
* need to be right before it.
*/
tsn_est = TSN_seq + 1;
if (tsn_est == at->rec.data.TSN_seq) {
/* Yep, It better be a first */
if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
SCTP_DATA_FIRST_FRAG) {
return (1);
} else {
return (0);
}
}
}
}
return (0);
}
static int
sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
int *break_flag, int last_chunk)
{
/* Process a data chunk */
/* struct sctp_tmit_chunk *chk; */
struct sctp_tmit_chunk *chk;
uint32_t tsn, gap;
struct mbuf *dmbuf;
int indx, the_len;
int need_reasm_check = 0;
uint16_t strmno, strmseq;
struct mbuf *oper;
struct sctp_queued_to_read *control;
int ordered;
uint32_t protocol_id;
uint8_t chunk_flags;
struct sctp_stream_reset_list *liste;
chk = NULL;
tsn = ntohl(ch->dp.tsn);
chunk_flags = ch->ch.chunk_flags;
protocol_id = ch->dp.protocol_id;
ordered = ((ch->ch.chunk_flags & SCTP_DATA_UNORDERED) == 0);
if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, tsn, asoc->cumulative_tsn, SCTP_MAP_PREPARE_SLIDE);
}
if (stcb == NULL) {
return (0);
}
SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
if (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN) ||
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++;
}
return (0);
}
/* Calculate the number of TSN's between the base and this TSN */
if (tsn >= asoc->mapping_array_base_tsn) {
gap = tsn - asoc->mapping_array_base_tsn;
} else {
gap = (MAX_TSN - asoc->mapping_array_base_tsn) + tsn + 1;
}
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 (compare_with_wrap(tsn, *high_tsn, MAX_TSN)) {
*high_tsn = tsn;
}
/* See if we have received this one already */
if (SCTP_IS_TSN_PRESENT(asoc->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!
*/
struct mbuf *op_err;
op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err);
*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.
*/
/* now do the tests */
if (((asoc->cnt_on_all_streams +
asoc->cnt_on_reasm_queue +
asoc->cnt_msg_on_sb) > 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 */
sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}
/* now is it in the mapping array of what we have accepted? */
if (compare_with_wrap(tsn,
asoc->highest_tsn_inside_map, MAX_TSN)) {
/* Nope not in the valid range dump it */
SCTPDBG(SCTP_DEBUG_INDATA1, "My rwnd overrun1:tsn:%lx rwnd %lu sbspace:%ld\n",
(u_long)tsn, (u_long)asoc->my_rwnd,
sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv));
sctp_set_rwnd(stcb, asoc);
if ((asoc->cnt_on_all_streams +
asoc->cnt_on_reasm_queue +
asoc->cnt_msg_on_sb) > sctp_max_chunks_on_queue) {
SCTP_STAT_INCR(sctps_datadropchklmt);
} else {
SCTP_STAT_INCR(sctps_datadroprwnd);
}
indx = *break_flag;
*break_flag = 1;
return (0);
}
}
strmno = ntohs(ch->dp.stream_id);
if (strmno >= asoc->streamincnt) {
struct sctp_paramhdr *phdr;
struct mbuf *mb;
mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
0, M_DONTWAIT, 1, MT_DATA);
if (mb != NULL) {
/* add some space up front so prepend will work well */
SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
phdr = mtod(mb, struct sctp_paramhdr *);
/*
* 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(mb) = (sizeof(struct sctp_paramhdr) * 2);
phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
phdr->param_length =
htons(sizeof(struct sctp_paramhdr) * 2);
phdr++;
/* We insert the stream in the type field */
phdr->param_type = ch->dp.stream_id;
/* And set the length to 0 for the rsvd field */
phdr->param_length = 0;
sctp_queue_op_err(stcb, mb);
}
SCTP_STAT_INCR(sctps_badsid);
SCTP_TCB_LOCK_ASSERT(stcb);
SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) {
/* we have a new high score */
asoc->highest_tsn_inside_map = tsn;
if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
}
if (tsn == (asoc->cumulative_tsn + 1)) {
/* Update cum-ack */
asoc->cumulative_tsn = tsn;
}
return (0);
}
/*
* Before we continue lets validate that we are not being fooled by
* an evil attacker. We can only have 4k chunks based on our TSN
* spread allowed by the mapping array 512 * 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.
*/
strmseq = ntohs(ch->dp.stream_sequence);
#ifdef SCTP_ASOCLOG_OF_TSNS
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 = strmseq;
asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
asoc->tsn_in_at++;
if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
asoc->tsn_in_at = 0;
asoc->tsn_in_wrapped = 1;
}
#endif
if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
(TAILQ_EMPTY(&asoc->resetHead)) &&
(chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
(compare_with_wrap(asoc->strmin[strmno].last_sequence_delivered,
strmseq, MAX_SEQ) ||
asoc->strmin[strmno].last_sequence_delivered == strmseq)) {
/* 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",
strmseq, asoc->strmin[strmno].last_sequence_delivered);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14);
ippp++;
*ippp = tsn;
ippp++;
*ippp = ((strmno << 16) | strmseq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return (0);
}
/************************************
* From here down we may find ch-> invalid
* so its a good idea NOT to use it.
*************************************/
the_len = (chk_length - sizeof(struct sctp_data_chunk));
if (last_chunk == 0) {
dmbuf = SCTP_M_COPYM(*m,
(offset + sizeof(struct sctp_data_chunk)),
the_len, M_DONTWAIT);
#ifdef SCTP_MBUF_LOGGING
if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
struct mbuf *mat;
mat = dmbuf;
while (mat) {
if (SCTP_BUF_IS_EXTENDED(mat)) {
sctp_log_mb(mat, SCTP_MBUF_ICOPY);
}
mat = SCTP_BUF_NEXT(mat);
}
}
#endif
} else {
/* We can steal the last chunk */
int l_len;
dmbuf = *m;
/* lop off the top part */
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;
lat = dmbuf;
while (lat) {
l_len += SCTP_BUF_LEN(lat);
lat = SCTP_BUF_NEXT(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);
}
if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
asoc->fragmented_delivery_inprogress == 0 &&
TAILQ_EMPTY(&asoc->resetHead) &&
((ordered == 0) ||
((asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
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....
*/
/* It would be nice to avoid this copy if we could :< */
sctp_alloc_a_readq(stcb, control);
sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
protocol_id,
stcb->asoc.context,
strmno, strmseq,
chunk_flags,
dmbuf);
if (control == NULL) {
goto failed_express_del;
}
sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1);
if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
/* for ordered, bump what we delivered */
asoc->strmin[strmno].last_sequence_delivered++;
}
SCTP_STAT_INCR(sctps_recvexpress);
if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
SCTP_STR_LOG_FROM_EXPRS_DEL);
}
control = NULL;
goto finish_express_del;
}
failed_express_del:
/* If we reach here this is a new chunk */
chk = NULL;
control = NULL;
/* Express for fragmented delivery? */
if ((asoc->fragmented_delivery_inprogress) &&
(stcb->asoc.control_pdapi) &&
(asoc->str_of_pdapi == strmno) &&
(asoc->ssn_of_pdapi == strmseq)
) {
control = stcb->asoc.control_pdapi;
if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
/* Can't be another first? */
goto failed_pdapi_express_del;
}
if (tsn == (control->sinfo_tsn + 1)) {
/* Yep, we can add it on */
int end = 0;
uint32_t cumack;
if (chunk_flags & SCTP_DATA_LAST_FRAG) {
end = 1;
}
cumack = asoc->cumulative_tsn;
if ((cumack + 1) == tsn)
cumack = tsn;
if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
tsn,
&stcb->sctp_socket->so_rcv)) {
SCTP_PRINTF("Append fails end:%d\n", end);
goto failed_pdapi_express_del;
}
SCTP_STAT_INCR(sctps_recvexpressm);
control->sinfo_tsn = tsn;
asoc->tsn_last_delivered = tsn;
asoc->fragment_flags = chunk_flags;
asoc->tsn_of_pdapi_last_delivered = tsn;
asoc->last_flags_delivered = chunk_flags;
asoc->last_strm_seq_delivered = strmseq;
asoc->last_strm_no_delivered = strmno;
if (end) {
/* clean up the flags and such */
asoc->fragmented_delivery_inprogress = 0;
if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
asoc->strmin[strmno].last_sequence_delivered++;
}
stcb->asoc.control_pdapi = NULL;
if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
/*
* There could be another message
* ready
*/
need_reasm_check = 1;
}
}
control = NULL;
goto finish_express_del;
}
}
failed_pdapi_express_del:
control = NULL;
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.stream_seq = strmseq;
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;
atomic_add_int(&net->ref_count, 1);
chk->data = dmbuf;
} else {
sctp_alloc_a_readq(stcb, control);
sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
protocol_id,
stcb->asoc.context,
strmno, strmseq,
chunk_flags,
dmbuf);
if (control == 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);
}
control->length = the_len;
}
/* Mark it as received */
/* Now queue it where it belongs */
if (control != NULL) {
/* First a sanity check */
if (asoc->fragmented_delivery_inprogress) {
/*
* Ok, we have a fragmented delivery in progress if
* this chunk is next to deliver OR belongs in our
* view to the reassembly, the peer is evil or
* broken.
*/
uint32_t estimate_tsn;
estimate_tsn = asoc->tsn_last_delivered + 1;
if (TAILQ_EMPTY(&asoc->reasmqueue) &&
(estimate_tsn == control->sinfo_tsn)) {
/* Evil/Broke peer */
sctp_m_freem(control->data);
control->data = NULL;
sctp_free_remote_addr(control->whoFrom);
sctp_free_a_readq(stcb, control);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15);
ippp++;
*ippp = tsn;
ippp++;
*ippp = ((strmno << 16) | strmseq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return (0);
} else {
if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
sctp_m_freem(control->data);
control->data = NULL;
sctp_free_remote_addr(control->whoFrom);
sctp_free_a_readq(stcb, control);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16);
ippp++;
*ippp = tsn;
ippp++;
*ippp = ((strmno << 16) | strmseq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return (0);
}
}
} else {
/* No PDAPI running */
if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
/*
* Reassembly queue is NOT empty validate
* that this tsn does not need to be in
* reasembly queue. If it does then our peer
* is broken or evil.
*/
if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
sctp_m_freem(control->data);
control->data = NULL;
sctp_free_remote_addr(control->whoFrom);
sctp_free_a_readq(stcb, control);
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) =
sizeof(struct sctp_paramhdr) +
(3 * sizeof(uint32_t));
ph = mtod(oper,
struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length =
htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
ippp++;
*ippp = tsn;
ippp++;
*ippp = ((strmno << 16) | strmseq);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
sctp_abort_an_association(stcb->sctp_ep,
stcb, SCTP_PEER_FAULTY, oper);
*abort_flag = 1;
return (0);
}
}
}
/* ok, if we reach here we have passed the sanity checks */
if (chunk_flags & SCTP_DATA_UNORDERED) {
/* queue directly into socket buffer */
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1);
} else {
/*
* 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.
*
* We take complete messages that have a stream reset
* intervening (aka the TSN is after where our
* cum-ack needs to be) off and put them on a
* pending_reply_queue. The reassembly ones we do
* not have to worry about since they are all sorted
* and proceessed by TSN order. It is only the
* singletons I must worry about.
*/
if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
((compare_with_wrap(tsn, liste->tsn, MAX_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;
unsigned char inserted = 0;
ctlOn = TAILQ_FIRST(&asoc->pending_reply_queue);
while (ctlOn) {
if (compare_with_wrap(control->sinfo_tsn,
ctlOn->sinfo_tsn, MAX_TSN)) {
ctlOn = TAILQ_NEXT(ctlOn, next);
} 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);
}
}
} else {
sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
if (*abort_flag) {
return (0);
}
}
}
} else {
/* Into the re-assembly queue */
sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
if (*abort_flag) {
/*
* the assoc is now gone and chk was put onto the
* reasm queue, which has all been freed.
*/
*m = NULL;
return (0);
}
}
finish_express_del:
if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) {
/* we have a new high score */
asoc->highest_tsn_inside_map = tsn;
if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
}
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_logging_level & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
}
if (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);
}
SCTP_TCB_LOCK_ASSERT(stcb);
SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
/* check the special flag for stream resets */
if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
((compare_with_wrap(asoc->cumulative_tsn, liste->tsn, MAX_TSN)) ||
(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;
sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams);
TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
SCTP_FREE(liste, SCTP_M_STRESET);
/* sa_ignore FREED_MEMORY */
liste = TAILQ_FIRST(&asoc->resetHead);
ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
if (ctl && (liste == NULL)) {
/* All can be removed */
while (ctl) {
TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
if (*abort_flag) {
return (0);
}
ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
}
} else if (ctl) {
/* more than one in queue */
while (!compare_with_wrap(ctl->sinfo_tsn, liste->tsn, MAX_TSN)) {
/*
* 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, asoc, ctl, abort_flag);
if (*abort_flag) {
return (0);
}
ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
}
}
/*
* Now service re-assembly to pick up anything that has been
* held on reassembly queue?
*/
sctp_deliver_reasm_check(stcb, asoc);
need_reasm_check = 0;
}
if (need_reasm_check) {
/* Another one waits ? */
sctp_deliver_reasm_check(stcb, asoc);
}
return (1);
}
int8_t sctp_map_lookup_tab[256] = {
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 4,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 5,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 4,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 6,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 4,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 5,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 4,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 3,
-1, 0, -1, 1, -1, 0, -1, 2,
-1, 0, -1, 1, -1, 0, -1, 7,
};
void
sctp_sack_check(struct sctp_tcb *stcb, int ok_to_sack, int was_a_gap, int *abort_flag)
{
/*
* Now we also need to check the mapping array in a couple of ways.
* 1) Did we move the cum-ack point?
*/
struct sctp_association *asoc;
int i, at;
int all_ones, last_all_ones = 0;
int slide_from, slide_end, lgap, distance;
uint32_t old_cumack, old_base, old_highest;
unsigned char aux_array[64];
asoc = &stcb->asoc;
at = 0;
old_cumack = asoc->cumulative_tsn;
old_base = asoc->mapping_array_base_tsn;
old_highest = asoc->highest_tsn_inside_map;
if (asoc->mapping_array_size < 64)
memcpy(aux_array, asoc->mapping_array,
asoc->mapping_array_size);
else
memcpy(aux_array, asoc->mapping_array, 64);
/*
* We could probably improve this a small bit by calculating the
* offset of the current cum-ack as the starting point.
*/
all_ones = 1;
at = 0;
for (i = 0; i < stcb->asoc.mapping_array_size; i++) {
if (asoc->mapping_array[i] == 0xff) {
at += 8;
last_all_ones = 1;
} else {
/* there is a 0 bit */
all_ones = 0;
at += sctp_map_lookup_tab[asoc->mapping_array[i]];
last_all_ones = 0;
break;
}
}
asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - last_all_ones);
/* at is one off, since in the table a embedded -1 is present */
at++;
if (compare_with_wrap(asoc->cumulative_tsn,
asoc->highest_tsn_inside_map,
MAX_TSN)) {
#ifdef INVARIANTS
panic("huh, cumack greater than high-tsn in map");
#else
SCTP_PRINTF("huh, cumack greater than high-tsn in map - should panic?\n");
asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
#endif
}
if (all_ones ||
(asoc->cumulative_tsn == asoc->highest_tsn_inside_map && at >= 8)) {
/* The complete array was completed by a single FR */
/* higest becomes the cum-ack */
int clr;
asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
/* clear the array */
if (all_ones)
clr = asoc->mapping_array_size;
else {
clr = (at >> 3) + 1;
/*
* this should be the allones case but just in case
* :>
*/
if (clr > asoc->mapping_array_size)
clr = asoc->mapping_array_size;
}
memset(asoc->mapping_array, 0, clr);
/* base becomes one ahead of the cum-ack */
asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(old_base, old_cumack, old_highest,
SCTP_MAP_PREPARE_SLIDE);
sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_CLEARED);
}
} else if (at >= 8) {
/* we can slide the mapping array down */
/* Calculate the new byte postion we can move down */
slide_from = at >> 3;
/*
* now calculate the ceiling of the move using our highest
* TSN value
*/
if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) {
lgap = asoc->highest_tsn_inside_map -
asoc->mapping_array_base_tsn;
} else {
lgap = (MAX_TSN - asoc->mapping_array_base_tsn) +
asoc->highest_tsn_inside_map + 1;
}
slide_end = lgap >> 3;
if (slide_end < slide_from) {
panic("impossible slide");
}
distance = (slide_end - slide_from) + 1;
if (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_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];
}
for (ii = distance; ii <= slide_end; ii++) {
asoc->mapping_array[ii] = 0;
}
asoc->mapping_array_base_tsn += (slide_from << 3);
if (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);
}
}
}
/*
* Now we need to see if we need to queue a sack or just start the
* timer (if allowed).
*/
if (ok_to_sack) {
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_18);
}
sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
sctp_send_sack(stcb);
} else {
int is_a_gap;
/* is there a gap now ? */
is_a_gap = compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
stcb->asoc.cumulative_tsn, MAX_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 ((sctp_cmt_on_off) && (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);
}
} else {
if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
sctp_timer_start(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL);
}
}
}
}
}
void
sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
uint32_t tsize;
uint16_t nxt_todel;
if (asoc->fragmented_delivery_inprogress) {
sctp_service_reassembly(stcb, asoc);
}
/* Can we proceed further, i.e. the PD-API is complete */
if (asoc->fragmented_delivery_inprogress) {
/* no */
return;
}
/*
* Now is there some other chunk I can deliver from the reassembly
* queue.
*/
doit_again:
chk = TAILQ_FIRST(&asoc->reasmqueue);
if (chk == NULL) {
asoc->size_on_reasm_queue = 0;
asoc->cnt_on_reasm_queue = 0;
return;
}
nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
((nxt_todel == chk->rec.data.stream_seq) ||
(chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
/*
* Yep the first one is here. We setup to start reception,
* by backing down the TSN just in case we can't deliver.
*/
/*
* Before we start though either all of the message should
* be here or 1/4 the socket buffer max or nothing on the
* delivery queue and something can be delivered.
*/
if ((sctp_is_all_msg_on_reasm(asoc, &tsize) ||
(tsize > stcb->sctp_ep->partial_delivery_point))) {
asoc->fragmented_delivery_inprogress = 1;
asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
asoc->str_of_pdapi = chk->rec.data.stream_number;
asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
asoc->pdapi_ppid = chk->rec.data.payloadtype;
asoc->fragment_flags = chk->rec.data.rcv_flags;
sctp_service_reassembly(stcb, asoc);
if (asoc->fragmented_delivery_inprogress == 0) {
goto doit_again;
}
}
}
}
int
sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
struct sctp_nets *net, uint32_t * high_tsn)
{
struct sctp_data_chunk *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 = 0;
struct mbuf *m;
/* set the rwnd */
sctp_set_rwnd(stcb, &stcb->asoc);
m = *mm;
SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
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!
*/
struct mbuf *op_err;
op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err);
return (2);
}
if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
stcb->asoc.cumulative_tsn, MAX_TSN)) {
/* there was a gap before this data was processed */
was_a_gap = 1;
}
/*
* 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_DONTWAIT, 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_data_chunk *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_data_chunk), (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->ch.chunk_length);
if (length - *offset < chk_length) {
/* all done, mutulated chunk */
stop_proc = 1;
break;
}
if (ch->ch.chunk_type == SCTP_DATA) {
if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) {
/*
* Need to send an abort since we had a
* invalid data chunk.
*/
struct mbuf *op_err;
op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (op_err) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) +
(2 * sizeof(uint32_t));
ph = mtod(op_err, struct sctp_paramhdr *);
ph->param_type =
htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(op_err));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19);
ippp++;
*ippp = asoc->cumulative_tsn;
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
sctp_abort_association(inp, stcb, m, iphlen, sh,
op_err, 0);
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, ch,
chk_length, net, high_tsn, &abort_flag, &break_flag,
last_chunk)) {
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;
break;
}
} else {
/* not a data chunk in the data region */
switch (ch->ch.chunk_type) {
case SCTP_INITIATION:
case SCTP_INITIATION_ACK:
case SCTP_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_strict_data_order) {
struct mbuf *op_err;
op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION);
sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0);
return (2);
}
break;
default:
/* unknown chunk type, use bit rules */
if (ch->ch.chunk_type & 0x40) {
/* Add a error report to the queue */
struct mbuf *merr;
struct sctp_paramhdr *phd;
merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA);
if (merr) {
phd = mtod(merr, struct sctp_paramhdr *);
/*
* We cheat and use param
* type since we did not
* bother to define a error
* cause struct. They are
* the same basic format
* with different names.
*/
phd->param_type =
htons(SCTP_CAUSE_UNRECOG_CHUNK);
phd->param_length =
htons(chk_length + sizeof(*phd));
SCTP_BUF_LEN(merr) = sizeof(*phd);
SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset,
SCTP_SIZE32(chk_length),
M_DONTWAIT);
if (SCTP_BUF_NEXT(merr)) {
sctp_queue_op_err(stcb, merr);
} else {
sctp_m_freem(merr);
}
}
}
if ((ch->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_data_chunk *)sctp_m_getptr(m, *offset,
sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
if (ch == NULL) {
*offset = length;
stop_proc = 1;
break;
}
} /* while */
if (break_flag) {
/*
* we need to report rwnd overrun drops.
*/
sctp_send_packet_dropped(stcb, net, *mm, 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);
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 (!(TAILQ_EMPTY(&asoc->reasmqueue)))
sctp_service_queues(stcb, asoc);
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 */
if ((stcb->asoc.cumulative_tsn == stcb->asoc.highest_tsn_inside_map) &&
(stcb->asoc.mapping_array[0] != 0xff)) {
if ((stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) ||
(stcb->asoc.delayed_ack == 0) ||
(stcb->asoc.send_sack == 1)) {
if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
}
sctp_send_sack(stcb);
} else {
if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
sctp_timer_start(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL);
}
}
} else {
sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
}
if (abort_flag)
return (2);
return (0);
}
static void
sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
struct sctp_sack_chunk *ch, 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 *ecn_seg_sums)
{
/************************************************/
/* process fragments and update sendqueue */
/************************************************/
struct sctp_sack *sack;
struct sctp_gap_ack_block *frag, block;
struct sctp_tmit_chunk *tp1;
int i;
unsigned int j;
int num_frs = 0;
uint16_t frag_strt, frag_end, primary_flag_set;
u_long last_frag_high;
/*
* @@@ JRI : TODO: This flag is not used anywhere .. remove?
*/
if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) {
primary_flag_set = 1;
} else {
primary_flag_set = 0;
}
sack = &ch->sack;
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;
}
tp1 = NULL;
last_frag_high = 0;
for (i = 0; i < num_seg; i++) {
frag_strt = ntohs(frag->start);
frag_end = ntohs(frag->end);
/* some sanity checks on the fargment offsets */
if (frag_strt > frag_end) {
/* this one is malformed, skip */
frag++;
continue;
}
if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked,
MAX_TSN))
*biggest_tsn_acked = frag_end + last_tsn;
/* mark acked dgs and find out the highestTSN being acked */
if (tp1 == NULL) {
tp1 = TAILQ_FIRST(&asoc->sent_queue);
/* save the locations of the last frags */
last_frag_high = frag_end + last_tsn;
} else {
/*
* now lets see if we need to reset the queue due to
* a out-of-order SACK fragment
*/
if (compare_with_wrap(frag_strt + last_tsn,
last_frag_high, MAX_TSN)) {
/*
* if the new frag starts after the last TSN
* frag covered, we are ok and this one is
* beyond the last one
*/
;
} else {
/*
* ok, they have reset us, so we need to
* reset the queue this will cause extra
* hunting but hey, they chose the
* performance hit when they failed to order
* there gaps..
*/
tp1 = TAILQ_FIRST(&asoc->sent_queue);
}
last_frag_high = frag_end + last_tsn;
}
for (j = frag_strt + last_tsn; j <= frag_end + last_tsn; j++) {
while (tp1) {
if (tp1->rec.data.doing_fast_retransmit)
num_frs++;
/*
* 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->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
(tp1->snd_count == 1)) {
tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
tp1->whoTo->find_pseudo_cumack = 0;
}
if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
(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 == j) {
if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
/*
* must be held until
* cum-ack passes
*/
/*
* ECN Nonce: Add the nonce
* value to the sender's
* nonce sum
*/
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 (compare_with_wrap(tp1->rec.data.TSN_seq,
*biggest_newly_acked_tsn, MAX_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 (compare_with_wrap(tp1->rec.data.TSN_seq,
tp1->whoTo->this_sack_highest_newack,
MAX_TSN)) {
tp1->whoTo->this_sack_highest_newack =
tp1->rec.data.TSN_seq;
}
/*
* CMT DAC algo:
* also update
* this_sack_lowest_n
* ewack
*/
if (*this_sack_lowest_newack == 0) {
if (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-cumac
* k for corresp
* dest is being
* acked, then we
* have a new
* (rtx-)pseudo-cumac
* k. Set
* new_(rtx_)pseudo_c
* umack to TRUE so
* that the cwnd for
* this dest can be
* updated. Also
* trigger search
* for the next
* expected
* (rtx-)pseudo-cumac
* k. 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_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_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_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
tp1->whoTo->flight_size,
tp1->book_size,
(uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, tp1);
tp1->whoTo->net_ack += tp1->send_size;
if (tp1->snd_count < 2) {
/*
* True
* non-retran
* smited
* chunk */
tp1->whoTo->net_ack2 += tp1->send_size;
/*
* update RTO
* too ? */
if (tp1->do_rtt) {
tp1->whoTo->RTO =
sctp_calculate_rto(stcb,
asoc,
tp1->whoTo,
&tp1->sent_rcv_time);
tp1->do_rtt = 0;
}
}
}
if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
(*ecn_seg_sums) += tp1->rec.data.ect_nonce;
(*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM;
if (compare_with_wrap(tp1->rec.data.TSN_seq,
asoc->this_sack_highest_gap,
MAX_TSN)) {
asoc->this_sack_highest_gap =
tp1->rec.data.TSN_seq;
}
if (tp1->sent == SCTP_DATAGRAM_RESEND) {
sctp_ucount_decr(asoc->sent_queue_retran_cnt);
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xB2,
(asoc->sent_queue_retran_cnt & 0x000000ff));
#endif
}
}
/*
* All chunks NOT UNSENT
* fall through here and are
* marked
*/
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;
}
}
break;
} /* if (tp1->TSN_seq == j) */
if (compare_with_wrap(tp1->rec.data.TSN_seq, j,
MAX_TSN))
break;
tp1 = TAILQ_NEXT(tp1, sctp_next);
} /* end while (tp1) */
} /* end for (j = fragStart */
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) {
break;
}
}
if (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);
}
}
static void
sctp_check_for_revoked(struct sctp_tcb *stcb,
struct sctp_association *asoc, uint32_t cumack,
u_long biggest_tsn_acked)
{
struct sctp_tmit_chunk *tp1;
int tot_revoked = 0;
tp1 = TAILQ_FIRST(&asoc->sent_queue);
while (tp1) {
if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack,
MAX_TSN)) {
/*
* 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 (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked,
MAX_TSN))
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_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
tp1->whoTo->flight_size,
tp1->book_size,
(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;
tot_revoked++;
if (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;
tp1 = TAILQ_NEXT(tp1, sctp_next);
}
if (tot_revoked > 0) {
/*
* Setup the ecn nonce re-sync point. We do this since once
* data is revoked we begin to retransmit things, which do
* NOT have the ECN bits set. This means we are now out of
* sync and must wait until we get back in sync with the
* peer to check ECN bits.
*/
tp1 = TAILQ_FIRST(&asoc->send_queue);
if (tp1 == NULL) {
asoc->nonce_resync_tsn = asoc->sending_seq;
} else {
asoc->nonce_resync_tsn = tp1->rec.data.TSN_seq;
}
asoc->nonce_wait_for_ecne = 0;
asoc->nonce_sum_check = 0;
}
}
static void
sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
u_long biggest_tsn_acked, u_long biggest_tsn_newly_acked, u_long 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 (sctp_cmt_on_off && sctp_cmt_use_dac) {
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (net->saw_newack)
num_dests_sacked++;
}
}
if (stcb->asoc.peer_supports_prsctp) {
(void)SCTP_GETTIME_TIMEVAL(&now);
}
tp1 = TAILQ_FIRST(&asoc->sent_queue);
while (tp1) {
strike_flag = 0;
if (tp1->no_fr_allowed) {
/* this one had a timeout or something */
tp1 = TAILQ_NEXT(tp1, sctp_next);
continue;
}
if (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 (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked,
MAX_TSN) ||
tp1->sent == SCTP_DATAGRAM_UNSENT) {
/* done */
break;
}
if (stcb->asoc.peer_supports_prsctp) {
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,
(SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
&asoc->sent_queue);
}
tp1 = TAILQ_NEXT(tp1, sctp_next);
continue;
}
}
if ((PR_SCTP_RTX_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
/* Has it been retransmitted tv_sec times? */
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,
(SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
&asoc->sent_queue);
}
tp1 = TAILQ_NEXT(tp1, sctp_next);
continue;
}
}
}
if (compare_with_wrap(tp1->rec.data.TSN_seq,
asoc->this_sack_highest_gap, MAX_TSN)) {
/* we are beyond the tsn in the sack */
break;
}
if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
/* either a RESEND, ACKED, or MARKED */
/* skip */
tp1 = TAILQ_NEXT(tp1, sctp_next);
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.
*/
tp1 = TAILQ_NEXT(tp1, sctp_next);
continue;
} else if (tp1->whoTo && compare_with_wrap(tp1->rec.data.TSN_seq,
tp1->whoTo->this_sack_highest_newack, MAX_TSN)) {
/*
* 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.
*/
tp1 = TAILQ_NEXT(tp1, sctp_next);
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_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 (sctp_cmt_on_off && 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) &&
compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) {
if (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) {
/*
* 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 ((compare_with_wrap(biggest_tsn_newly_acked,
tp1->rec.data.fast_retran_tsn, MAX_TSN)) ||
(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_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 (sctp_cmt_on_off && 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) &&
compare_with_wrap(this_sack_lowest_newack,
tp1->rec.data.TSN_seq, MAX_TSN)) {
if (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 (compare_with_wrap(tp1->rec.data.TSN_seq,
biggest_tsn_newly_acked, MAX_TSN)) {
/*
* 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_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 (sctp_cmt_on_off && 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) &&
compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) {
if (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) {
/* Increment the count to resend */
struct sctp_nets *alt;
/* printf("OK, we are now ready to FR this guy\n"); */
if (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 (sctp_cmt_on_off) {
/*
* 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 */
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 */
/*
* 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
*/
tp1->do_rtt = 0;
}
/* fix counts and things */
if (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,
(uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
if (tp1->whoTo) {
tp1->whoTo->net_ack++;
sctp_flight_size_decrease(tp1);
}
if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
asoc->peers_rwnd, tp1->send_size, sctp_peer_chunk_oh);
}
/* add back to the rwnd */
asoc->peers_rwnd += (tp1->send_size + sctp_peer_chunk_oh);
/* remove from the total flight */
sctp_total_flight_decrease(stcb, tp1);
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);
}
}
tp1 = TAILQ_NEXT(tp1, sctp_next);
} /* while (tp1) */
if (tot_retrans > 0) {
/*
* Setup the ecn nonce re-sync point. We do this since once
* we go to FR something we introduce a Karn's rule scenario
* and won't know the totals for the ECN bits.
*/
asoc->nonce_resync_tsn = sending_seq;
asoc->nonce_wait_for_ecne = 0;
asoc->nonce_sum_check = 0;
}
}
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->peer_supports_prsctp == 0) {
return (NULL);
}
tp1 = TAILQ_FIRST(&asoc->sent_queue);
while (tp1) {
if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
tp1->sent != SCTP_DATAGRAM_RESEND) {
/* no chance to advance, out of here */
break;
}
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;
}
tp2 = TAILQ_NEXT(tp1, sctp_next);
/*
* 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,
(SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
&asoc->sent_queue);
}
} 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) {
/* advance PeerAckPoint goes forward */
asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
a_adv = tp1;
/*
* we don't want to de-queue it here. Just wait for
* the next peer SACK to come with a new cumTSN and
* then the chunk will be droped in the normal
* fashion.
*/
if (tp1->data) {
sctp_free_bufspace(stcb, asoc, tp1, 1);
/*
* Maybe there should be another
* notification type
*/
sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
(SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
tp1);
sctp_m_freem(tp1->data);
tp1->data = NULL;
if (stcb->sctp_socket) {
sctp_sowwakeup(stcb->sctp_ep,
stcb->sctp_socket);
if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, tp1->rec.data.TSN_seq, 1, SCTP_WAKESND_FROM_FWDTSN);
}
}
}
} else {
/*
* If it is still in RESEND we can advance no
* further
*/
break;
}
/*
* If we hit here we just dumped tp1, move to next tsn on
* sent queue.
*/
tp1 = tp2;
}
return (a_adv);
}
#ifdef SCTP_HIGH_SPEED
struct sctp_hs_raise_drop {
int32_t cwnd;
int32_t increase;
int32_t drop_percent;
};
#define SCTP_HS_TABLE_SIZE 73
struct sctp_hs_raise_drop sctp_cwnd_adjust[SCTP_HS_TABLE_SIZE] = {
{38, 1, 50}, /* 0 */
{118, 2, 44}, /* 1 */
{221, 3, 41}, /* 2 */
{347, 4, 38}, /* 3 */
{495, 5, 37}, /* 4 */
{663, 6, 35}, /* 5 */
{851, 7, 34}, /* 6 */
{1058, 8, 33}, /* 7 */
{1284, 9, 32}, /* 8 */
{1529, 10, 31}, /* 9 */
{1793, 11, 30}, /* 10 */
{2076, 12, 29}, /* 11 */
{2378, 13, 28}, /* 12 */
{2699, 14, 28}, /* 13 */
{3039, 15, 27}, /* 14 */
{3399, 16, 27}, /* 15 */
{3778, 17, 26}, /* 16 */
{4177, 18, 26}, /* 17 */
{4596, 19, 25}, /* 18 */
{5036, 20, 25}, /* 19 */
{5497, 21, 24}, /* 20 */
{5979, 22, 24}, /* 21 */
{6483, 23, 23}, /* 22 */
{7009, 24, 23}, /* 23 */
{7558, 25, 22}, /* 24 */
{8130, 26, 22}, /* 25 */
{8726, 27, 22}, /* 26 */
{9346, 28, 21}, /* 27 */
{9991, 29, 21}, /* 28 */
{10661, 30, 21}, /* 29 */
{11358, 31, 20}, /* 30 */
{12082, 32, 20}, /* 31 */
{12834, 33, 20}, /* 32 */
{13614, 34, 19}, /* 33 */
{14424, 35, 19}, /* 34 */
{15265, 36, 19}, /* 35 */
{16137, 37, 19}, /* 36 */
{17042, 38, 18}, /* 37 */
{17981, 39, 18}, /* 38 */
{18955, 40, 18}, /* 39 */
{19965, 41, 17}, /* 40 */
{21013, 42, 17}, /* 41 */
{22101, 43, 17}, /* 42 */
{23230, 44, 17}, /* 43 */
{24402, 45, 16}, /* 44 */
{25618, 46, 16}, /* 45 */
{26881, 47, 16}, /* 46 */
{28193, 48, 16}, /* 47 */
{29557, 49, 15}, /* 48 */
{30975, 50, 15}, /* 49 */
{32450, 51, 15}, /* 50 */
{33986, 52, 15}, /* 51 */
{35586, 53, 14}, /* 52 */
{37253, 54, 14}, /* 53 */
{38992, 55, 14}, /* 54 */
{40808, 56, 14}, /* 55 */
{42707, 57, 13}, /* 56 */
{44694, 58, 13}, /* 57 */
{46776, 59, 13}, /* 58 */
{48961, 60, 13}, /* 59 */
{51258, 61, 13}, /* 60 */
{53677, 62, 12}, /* 61 */
{56230, 63, 12}, /* 62 */
{58932, 64, 12}, /* 63 */
{61799, 65, 12}, /* 64 */
{64851, 66, 11}, /* 65 */
{68113, 67, 11}, /* 66 */
{71617, 68, 11}, /* 67 */
{75401, 69, 10}, /* 68 */
{79517, 70, 10}, /* 69 */
{84035, 71, 10}, /* 70 */
{89053, 72, 10}, /* 71 */
{94717, 73, 9} /* 72 */
};
static void
sctp_hs_cwnd_increase(struct sctp_tcb *stcb, struct sctp_nets *net)
{
int cur_val, i, indx, incr;
cur_val = net->cwnd >> 10;
indx = SCTP_HS_TABLE_SIZE - 1;
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
/* normal mode */
if (net->net_ack > net->mtu) {
net->cwnd += net->mtu;
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, net->mtu, SCTP_CWND_LOG_FROM_SS);
}
} else {
net->cwnd += net->net_ack;
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, net->net_ack, SCTP_CWND_LOG_FROM_SS);
}
}
} else {
for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) {
if (cur_val < sctp_cwnd_adjust[i].cwnd) {
indx = i;
break;
}
}
net->last_hs_used = indx;
incr = ((sctp_cwnd_adjust[indx].increase) << 10);
net->cwnd += incr;
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, incr, SCTP_CWND_LOG_FROM_SS);
}
}
}
static void
sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net)
{
int cur_val, i, indx;
int old_cwnd = net->cwnd;
cur_val = net->cwnd >> 10;
indx = net->last_hs_used;
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
/* normal mode */
net->ssthresh = net->cwnd / 2;
if (net->ssthresh < (net->mtu * 2)) {
net->ssthresh = 2 * net->mtu;
}
net->cwnd = net->ssthresh;
} else {
/* drop by the proper amount */
net->ssthresh = net->cwnd - (int)((net->cwnd / 100) *
sctp_cwnd_adjust[net->last_hs_used].drop_percent);
net->cwnd = net->ssthresh;
/* now where are we */
indx = net->last_hs_used;
cur_val = net->cwnd >> 10;
/* reset where we are in the table */
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
/* feel out of hs */
net->last_hs_used = 0;
} else {
for (i = indx; i >= 1; i--) {
if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) {
break;
}
}
net->last_hs_used = indx;
}
}
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR);
}
}
#endif
static void
sctp_cwnd_update(struct sctp_tcb *stcb,
struct sctp_association *asoc,
int accum_moved, int reneged_all, int will_exit)
{
struct sctp_nets *net;
/******************************/
/* update cwnd and Early FR */
/******************************/
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
#ifdef JANA_CMT_FAST_RECOVERY
/*
* CMT fast recovery code. Need to debug.
*/
if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
if (compare_with_wrap(asoc->last_acked_seq,
net->fast_recovery_tsn, MAX_TSN) ||
(asoc->last_acked_seq == net->fast_recovery_tsn) ||
compare_with_wrap(net->pseudo_cumack, net->fast_recovery_tsn, MAX_TSN) ||
(net->pseudo_cumack == net->fast_recovery_tsn)) {
net->will_exit_fast_recovery = 1;
}
}
#endif
if (sctp_early_fr) {
/*
* So, first of all do we need to have a Early FR
* timer running?
*/
if (((TAILQ_FIRST(&asoc->sent_queue)) &&
(net->ref_count > 1) &&
(net->flight_size < net->cwnd)) ||
(reneged_all)) {
/*
* yes, so in this case stop it if its
* running, and then restart it. Reneging
* all is a special case where we want to
* run the Early FR timer and then force the
* last few unacked to be sent, causing us
* to illicit a sack with gaps to force out
* the others.
*/
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpidsck2);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_20);
}
SCTP_STAT_INCR(sctps_earlyfrstrid);
sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net);
} else {
/* No, stop it if its running */
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpidsck3);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_21);
}
}
}
/* if nothing was acked on this destination skip it */
if (net->net_ack == 0) {
if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
}
continue;
}
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_NOT_REACHABLE) ==
SCTP_ADDR_NOT_REACHABLE) {
/* addr came good */
net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
net->dest_state |= SCTP_ADDR_REACHABLE;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
SCTP_RECEIVED_SACK, (void *)net);
/* now was it the primary? if so restore */
if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
(void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net);
}
}
}
#ifdef JANA_CMT_FAST_RECOVERY
/*
* CMT fast recovery code
*/
/*
* if (sctp_cmt_on_off == 1 &&
* net->fast_retran_loss_recovery &&
* net->will_exit_fast_recovery == 0) { // @@@ Do something
* } else if (sctp_cmt_on_off == 0 &&
* asoc->fast_retran_loss_recovery && will_exit == 0) {
*/
#endif
if (asoc->fast_retran_loss_recovery && will_exit == 0 && sctp_cmt_on_off == 0) {
/*
* If we are in loss recovery we skip any cwnd
* update
*/
goto skip_cwnd_update;
}
/*
* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
* moved.
*/
if (accum_moved || (sctp_cmt_on_off && net->new_pseudo_cumack)) {
/* If the cumulative ack moved we can proceed */
if (net->cwnd <= net->ssthresh) {
/* We are in slow start */
if (net->flight_size + net->net_ack >=
net->cwnd) {
#ifdef SCTP_HIGH_SPEED
sctp_hs_cwnd_increase(stcb, net);
#else
if (net->net_ack > (net->mtu * sctp_L2_abc_variable)) {
net->cwnd += (net->mtu * sctp_L2_abc_variable);
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, net->mtu,
SCTP_CWND_LOG_FROM_SS);
}
} else {
net->cwnd += net->net_ack;
sctp_log_cwnd(stcb, net, net->net_ack,
SCTP_CWND_LOG_FROM_SS);
}
#endif
} else {
unsigned int dif;
dif = net->cwnd - (net->flight_size +
net->net_ack);
if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, net, net->net_ack,
SCTP_CWND_LOG_NOADV_SS);
}
}
} else {
/* We are in congestion avoidance */
if (net->flight_size + net->net_ack >=
net->cwnd) {
/*
* add to pba only if we had a
* cwnd's worth (or so) in flight OR
* the burst limit was applied.
*/
net->partial_bytes_acked +=
net->net_ack;
/*
* Do we need to increase (if pba is
* > cwnd)?
*/
if (net->partial_bytes_acked >=
net->cwnd) {
if (net->cwnd <
net->partial_bytes_acked) {
net->partial_bytes_acked -=
net->cwnd;
} else {
net->partial_bytes_acked =
0;
}
net->cwnd += net->mtu;
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, net->mtu,
SCTP_CWND_LOG_FROM_CA);
}
} else {
if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, net, net->net_ack,
SCTP_CWND_LOG_NOADV_CA);
}
}
} else {
unsigned int dif;
if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, net, net->net_ack,
SCTP_CWND_LOG_NOADV_CA);
}
dif = net->cwnd - (net->flight_size +
net->net_ack);
}
}
} else {
if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
sctp_log_cwnd(stcb, net, net->mtu,
SCTP_CWND_LOG_NO_CUMACK);
}
}
skip_cwnd_update:
/*
* NOW, according to Karn's rule do we need to restore the
* RTO timer back? Check our net_ack2. If not set then we
* have a ambiguity.. i.e. all data ack'd was sent to more
* than one place.
*/
if (net->net_ack2) {
/* restore any doubled timers */
net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1;
if (net->RTO < stcb->asoc.minrto) {
net->RTO = stcb->asoc.minrto;
}
if (net->RTO > stcb->asoc.maxrto) {
net->RTO = stcb->asoc.maxrto;
}
}
}
}
static void
sctp_fs_audit(struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
if (chk->sent < SCTP_DATAGRAM_RESEND) {
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("Flight size-express incorrect inflight:%d inbetween:%d\n",
inflight, inbetween);
#endif
}
}
static void
sctp_window_probe_recovery(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_nets *net,
struct sctp_tmit_chunk *tp1)
{
struct sctp_tmit_chunk *chk;
/* First setup this one and get it moved back */
tp1->sent = SCTP_DATAGRAM_UNSENT;
tp1->window_probe = 0;
if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
tp1->whoTo->flight_size,
tp1->book_size,
(uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, tp1);
TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
TAILQ_INSERT_HEAD(&asoc->send_queue, tp1, sctp_next);
asoc->sent_queue_cnt--;
asoc->send_queue_cnt++;
/*
* Now all guys marked for RESEND on the sent_queue must be moved
* back too.
*/
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
if (chk->sent == SCTP_DATAGRAM_RESEND) {
/* Another chunk to move */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->window_probe = 0;
/* It should not be in flight */
TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
TAILQ_INSERT_AFTER(&asoc->send_queue, tp1, chk, sctp_next);
asoc->sent_queue_cnt--;
asoc->send_queue_cnt++;
sctp_ucount_decr(asoc->sent_queue_retran_cnt);
}
}
}
void
sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
uint32_t rwnd, int nonce_sum_flag, int *abort_now)
{
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;
if (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);
asoc = &stcb->asoc;
old_rwnd = asoc->peers_rwnd;
if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) {
/* 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->sent_queue_cnt * 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) {
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 (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 ((cumack == send_s) ||
compare_with_wrap(cumack, send_s, MAX_TSN)) {
#ifndef INVARIANTS
struct mbuf *oper;
#endif
#ifdef INVARIANTS
panic("Impossible sack 1");
#else
*abort_now = 1;
/* XXX */
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
sizeof(uint32_t);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper);
return;
#endif
}
}
asoc->this_sack_highest_gap = cumack;
stcb->asoc.overall_error_count = 0;
if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) {
/* process the new consecutive TSN first */
tp1 = TAILQ_FIRST(&asoc->sent_queue);
while (tp1) {
tp2 = TAILQ_NEXT(tp1, sctp_next);
if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq,
MAX_TSN) ||
cumack == tp1->rec.data.TSN_seq) {
if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
/*
* ECN Nonce: Add the nonce to the
* sender's nonce sum
*/
asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce;
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_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
tp1->whoTo->flight_size,
tp1->book_size,
(uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(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) {
tp1->whoTo->RTO =
sctp_calculate_rto(stcb,
asoc, tp1->whoTo,
&tp1->sent_rcv_time);
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_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);
}
if (tp1->rec.data.chunk_was_revoked) {
/* deflate the cwnd */
tp1->whoTo->cwnd -= tp1->book_size;
tp1->rec.data.chunk_was_revoked = 0;
}
tp1->sent = SCTP_DATAGRAM_ACKED;
}
} else {
break;
}
TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
if (tp1->data) {
sctp_free_bufspace(stcb, asoc, tp1, 1);
sctp_m_freem(tp1->data);
}
if (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);
}
tp1->data = NULL;
asoc->sent_queue_cnt--;
sctp_free_remote_addr(tp1->whoTo);
sctp_free_a_chunk(stcb, tp1);
tp1 = tp2;
}
}
if (stcb->sctp_socket) {
SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK);
}
sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
} else {
if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK);
}
}
if (asoc->last_acked_seq != cumack)
sctp_cwnd_update(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;
}
/* Fix up the a-p-a-p for future PR-SCTP sends */
if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) {
asoc->advanced_peer_ack_point = cumack;
}
/* ECN Nonce updates */
if (asoc->ecn_nonce_allowed) {
if (asoc->nonce_sum_check) {
if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) {
if (asoc->nonce_wait_for_ecne == 0) {
struct sctp_tmit_chunk *lchk;
lchk = TAILQ_FIRST(&asoc->send_queue);
asoc->nonce_wait_for_ecne = 1;
if (lchk) {
asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq;
} else {
asoc->nonce_wait_tsn = asoc->sending_seq;
}
} else {
if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) ||
(asoc->last_acked_seq == asoc->nonce_wait_tsn)) {
/*
* Misbehaving peer. We need
* to react to this guy
*/
asoc->ecn_allowed = 0;
asoc->ecn_nonce_allowed = 0;
}
}
}
} else {
/* See if Resynchronization Possible */
if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) {
asoc->nonce_sum_check = 1;
/*
* now we must calculate what the base is.
* We do this based on two things, we know
* the total's for all the segments
* gap-acked in the SACK (none), We also
* know the SACK's nonce sum, its in
* nonce_sum_flag. So we can build a truth
* table to back-calculate the new value of
* asoc->nonce_sum_expect_base:
*
* SACK-flag-Value Seg-Sums Base 0 0 0
* 1 0 1 0 1 1 1
* 1 0
*/
asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM;
}
}
}
/* RWND update */
asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
(uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * 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) {
if (win_probe_recovery && (net->window_probe)) {
net->window_probe = 0;
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, net, tp1);
break;
}
}
}
if (net->flight_size) {
int to_ticks;
if (net->RTO == 0) {
to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
} else {
to_ticks = MSEC_TO_TICKS(net->RTO);
}
j++;
(void)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_22);
}
if (sctp_early_fr) {
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, 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 */
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) {
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) && (sp->msg_is_complete == 0)) {
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 *oper;
abort_out_now:
*abort_now = 1;
/* XXX */
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
sizeof(uint32_t);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper);
} else {
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
sctp_stop_timers_for_shutdown(stcb);
sctp_send_shutdown(stcb,
stcb->asoc.primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
stcb->sctp_ep, stcb, asoc->primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, asoc->primary_destination);
}
} else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
(asoc->stream_queue_cnt == 0)) {
if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
goto abort_out_now;
}
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
sctp_send_shutdown_ack(stcb,
stcb->asoc.primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
stcb->sctp_ep, stcb, asoc->primary_destination);
}
}
if (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,
struct sctp_sack_chunk *ch, struct sctp_tcb *stcb,
struct sctp_nets *net_from, int *abort_now, int sack_len, uint32_t rwnd)
{
struct sctp_association *asoc;
struct sctp_sack *sack;
struct sctp_tmit_chunk *tp1, *tp2;
uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked,
this_sack_lowest_newack;
uint32_t sav_cum_ack;
uint16_t num_seg, num_dup;
uint16_t wake_him = 0;
unsigned int sack_length;
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 nonce_sum_flag, ecn_seg_sums = 0;
int done_once;
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);
sack = &ch->sack;
/* CMT DAC algo */
this_sack_lowest_newack = 0;
j = 0;
sack_length = (unsigned int)sack_len;
/* ECN Nonce */
SCTP_STAT_INCR(sctps_slowpath_sack);
nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM;
cum_ack = last_tsn = ntohl(sack->cum_tsn_ack);
num_seg = ntohs(sack->num_gap_ack_blks);
a_rwnd = rwnd;
if (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);
}
/* CMT DAC algo */
cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC;
num_dup = ntohs(sack->num_dup_tsns);
old_rwnd = stcb->asoc.peers_rwnd;
stcb->asoc.overall_error_count = 0;
asoc = &stcb->asoc;
if (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_logging_level & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) {
int off_to_dup, iii;
uint32_t *dupdata, dblock;
off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + sizeof(struct sctp_sack_chunk);
if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= sack_length) {
dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup,
sizeof(uint32_t), (uint8_t *) & dblock);
off_to_dup += sizeof(uint32_t);
if (dupdata) {
for (iii = 0; iii < num_dup; iii++) {
sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup,
sizeof(uint32_t), (uint8_t *) & dblock);
if (dupdata == NULL)
break;
off_to_dup += sizeof(uint32_t);
}
}
} else {
SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d sack_len:%d num gaps:%d\n",
off_to_dup, num_dup, sack_length, num_seg);
}
}
if (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 {
send_s = asoc->sending_seq;
}
if (cum_ack == send_s ||
compare_with_wrap(cum_ack, send_s, MAX_TSN)) {
#ifndef INVARIANTS
struct mbuf *oper;
#endif
#ifdef INVARIANTS
hopeless_peer:
panic("Impossible sack 1");
#else
/*
* no way, we have not even sent this TSN out yet.
* Peer is hopelessly messed up with us.
*/
hopeless_peer:
*abort_now = 1;
/* XXX */
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
sizeof(uint32_t);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper);
return;
#endif
}
}
/**********************/
/* 1) check the range */
/**********************/
if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) {
/* acking something behind */
return;
}
sav_cum_ack = asoc->last_acked_seq;
/* 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_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);
if (sctp_early_fr) {
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpidsck1);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, 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) {
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;
}
/* process the new consecutive TSN first */
tp1 = TAILQ_FIRST(&asoc->sent_queue);
while (tp1) {
if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq,
MAX_TSN) ||
last_tsn == tp1->rec.data.TSN_seq) {
if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
/*
* ECN Nonce: Add the nonce to the sender's
* nonce sum
*/
asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce;
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_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
tp1->whoTo->flight_size,
tp1->book_size,
(uintptr_t) tp1->whoTo,
tp1->rec.data.TSN_seq);
}
sctp_flight_size_decrease(tp1);
sctp_total_flight_decrease(stcb, 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) {
tp1->whoTo->RTO =
sctp_calculate_rto(stcb,
asoc, tp1->whoTo,
&tp1->sent_rcv_time);
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_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_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;
}
tp1->sent = SCTP_DATAGRAM_ACKED;
}
} else {
break;
}
tp1 = TAILQ_NEXT(tp1, sctp_next);
}
biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
/* always set this up to cum-ack */
asoc->this_sack_highest_gap = last_tsn;
/* Move offset up to point to gaps/dups */
offset += sizeof(struct sctp_sack_chunk);
if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_sack_chunk)) > sack_length) {
/* skip corrupt segments */
goto skip_segments;
}
if (num_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.
*/
sctp_handle_segments(m, &offset, stcb, asoc, ch, last_tsn,
&biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack,
num_seg, &ecn_seg_sums);
if (sctp_strict_sacks) {
/*
* validate the biggest_tsn_acked in the gap acks if
* strict adherence is wanted.
*/
if ((biggest_tsn_acked == send_s) ||
(compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) {
/*
* peer is either confused or we are under
* attack. We must abort.
*/
goto hopeless_peer;
}
}
}
skip_segments:
/*******************************************/
/* cancel ALL T3-send timer if accum moved */
/*******************************************/
if (sctp_cmt_on_off) {
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 sendqueue */
/********************************************/
asoc->last_acked_seq = cum_ack;
tp1 = TAILQ_FIRST(&asoc->sent_queue);
if (tp1 == NULL)
goto done_with_it;
do {
if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack,
MAX_TSN)) {
break;
}
if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
/* no more sent on list */
break;
}
tp2 = TAILQ_NEXT(tp1, sctp_next);
TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
/*
* Friendlier printf in lieu of panic now that I think its
* fixed
*/
if (tp1->pr_sctp_on) {
if (asoc->pr_sctp_cnt != 0)
asoc->pr_sctp_cnt--;
}
if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) &&
(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;
}
if (tp1->data) {
sctp_free_bufspace(stcb, asoc, tp1, 1);
sctp_m_freem(tp1->data);
if (PR_SCTP_BUF_ENABLED(tp1->flags)) {
asoc->sent_queue_cnt_removeable--;
}
}
if (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);
}
tp1->data = NULL;
asoc->sent_queue_cnt--;
sctp_free_remote_addr(tp1->whoTo);
sctp_free_a_chunk(stcb, tp1);
wake_him++;
tp1 = tp2;
} while (tp1 != NULL);
done_with_it:
if ((wake_him) && (stcb->sctp_socket)) {
SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK);
}
sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
} else {
if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK);
}
}
if (asoc->fast_retran_loss_recovery && accum_moved) {
if (compare_with_wrap(asoc->last_acked_seq,
asoc->fast_recovery_tsn, MAX_TSN) ||
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);
else if (asoc->saw_sack_with_frags) {
int cnt_revoked = 0;
tp1 = TAILQ_FIRST(&asoc->sent_queue);
if (tp1 != NULL) {
/* Peer revoked all dg's marked or acked */
TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
if ((tp1->sent > SCTP_DATAGRAM_RESEND) &&
(tp1->sent < SCTP_FORWARD_TSN_SKIP)) {
tp1->sent = SCTP_DATAGRAM_SENT;
if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
tp1->whoTo->flight_size,
tp1->book_size,
(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_seg)
asoc->saw_sack_with_frags = 1;
else
asoc->saw_sack_with_frags = 0;
sctp_cwnd_update(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 */
if (sctp_early_fr) {
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_29);
}
}
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_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) && (sp->msg_is_complete == 0)) {
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 *oper;
abort_out_now:
*abort_now = 1;
/* XXX */
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
sizeof(uint32_t);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31);
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper);
return;
} else {
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
sctp_stop_timers_for_shutdown(stcb);
sctp_send_shutdown(stcb,
stcb->asoc.primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
stcb->sctp_ep, stcb, asoc->primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb, asoc->primary_destination);
}
return;
} else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
(asoc->stream_queue_cnt == 0)) {
if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
goto abort_out_now;
}
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
sctp_send_shutdown_ack(stcb,
stcb->asoc.primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
stcb->sctp_ep, stcb, asoc->primary_destination);
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 (sctp_cmt_on_off && sctp_cmt_use_dac && (cmt_dac_flag == 0)) {
this_sack_lowest_newack = cum_ack;
}
if (num_seg > 0) {
sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
}
/*********************************************/
/* Here we perform PR-SCTP procedures */
/* (section 4.2) */
/*********************************************/
/* C1. update advancedPeerAckPoint */
if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) {
asoc->advanced_peer_ack_point = cum_ack;
}
/* C2. try to further move advancedPeerAckPoint ahead */
if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
struct sctp_tmit_chunk *lchk;
lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
/* C3. See if we need to send a Fwd-TSN */
if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack,
MAX_TSN)) {
/*
* ISSUE with ECN, see FWD-TSN processing for notes
* on issues that will occur when the ECN NONCE
* stuff is put into SCTP for cross checking.
*/
send_forward_tsn(stcb, asoc);
/*
* ECN Nonce: Disable Nonce Sum check when FWD TSN
* is sent and store resync tsn
*/
asoc->nonce_sum_check = 0;
asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point;
if (lchk) {
/* Assure a timer is up */
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, lchk->whoTo);
}
}
}
/*
* CMT fast recovery code. Need to debug. ((sctp_cmt_on_off == 1) &&
* (net->fast_retran_loss_recovery == 0)))
*/
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if ((asoc->fast_retran_loss_recovery == 0) || (sctp_cmt_on_off == 1)) {
/* out of a RFC2582 Fast recovery window? */
if (net->net_ack > 0) {
/*
* per section 7.2.3, are there any
* destinations that had a fast retransmit
* to them. If so what we need to do is
* adjust ssthresh and cwnd.
*/
struct sctp_tmit_chunk *lchk;
#ifdef SCTP_HIGH_SPEED
sctp_hs_cwnd_decrease(stcb, net);
#else
int old_cwnd = net->cwnd;
net->ssthresh = net->cwnd / 2;
if (net->ssthresh < (net->mtu * 2)) {
net->ssthresh = 2 * net->mtu;
}
net->cwnd = net->ssthresh;
if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
SCTP_CWND_LOG_FROM_FR);
}
#endif
lchk = TAILQ_FIRST(&asoc->send_queue);
net->partial_bytes_acked = 0;
/* Turn on fast recovery window */
asoc->fast_retran_loss_recovery = 1;
if (lchk == NULL) {
/* Mark end of the window */
asoc->fast_recovery_tsn = asoc->sending_seq - 1;
} else {
asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
}
/*
* CMT fast recovery -- per destination
* recovery variable.
*/
net->fast_retran_loss_recovery = 1;
if (lchk == NULL) {
/* Mark end of the window */
net->fast_recovery_tsn = asoc->sending_seq - 1;
} else {
net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
}
/*
* Disable Nonce Sum Checking and store the
* resync tsn
*/
asoc->nonce_sum_check = 0;
asoc->nonce_resync_tsn = asoc->fast_recovery_tsn + 1;
sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
stcb->sctp_ep, stcb, net);
}
} else if (net->net_ack > 0) {
/*
* Mark a peg that we WOULD have done a cwnd
* reduction but RFC2582 prevented this action.
*/
SCTP_STAT_INCR(sctps_fastretransinrtt);
}
}
/******************************************************************
* Here we do the stuff with ECN Nonce checking.
* We basically check to see if the nonce sum flag was incorrect
* or if resynchronization needs to be done. Also if we catch a
* misbehaving receiver we give him the kick.
******************************************************************/
if (asoc->ecn_nonce_allowed) {
if (asoc->nonce_sum_check) {
if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) {
if (asoc->nonce_wait_for_ecne == 0) {
struct sctp_tmit_chunk *lchk;
lchk = TAILQ_FIRST(&asoc->send_queue);
asoc->nonce_wait_for_ecne = 1;
if (lchk) {
asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq;
} else {
asoc->nonce_wait_tsn = asoc->sending_seq;
}
} else {
if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) ||
(asoc->last_acked_seq == asoc->nonce_wait_tsn)) {
/*
* Misbehaving peer. We need
* to react to this guy
*/
asoc->ecn_allowed = 0;
asoc->ecn_nonce_allowed = 0;
}
}
}
} else {
/* See if Resynchronization Possible */
if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) {
asoc->nonce_sum_check = 1;
/*
* now we must calculate what the base is.
* We do this based on two things, we know
* the total's for all the segments
* gap-acked in the SACK, its stored in
* ecn_seg_sums. We also know the SACK's
* nonce sum, its in nonce_sum_flag. So we
* can build a truth table to back-calculate
* the new value of
* asoc->nonce_sum_expect_base:
*
* SACK-flag-Value Seg-Sums Base 0 0 0
* 1 0 1 0 1 1 1
* 1 0
*/
asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM;
}
}
}
/* 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) &&
((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn,
MAX_TSN) ||
(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_logging_level & SCTP_LOG_RWND_ENABLE) {
sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * sctp_peer_chunk_oh), a_rwnd);
}
asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
(uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * 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)) {
net->window_probe = 0;
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, net, tp1);
break;
}
}
}
if (net->flight_size) {
j++;
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_22);
}
if (sctp_early_fr) {
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, 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 */
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) {
asoc->sent_queue_retran_cnt++;
}
}
done_once = 1;
goto again;
}
if (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,
struct sctp_nets *netp, 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, 0, abort_flag);
}
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;
int tt;
asoc = &stcb->asoc;
tt = strmin->last_sequence_delivered;
/*
* First deliver anything prior to and including the stream no that
* came in
*/
ctl = TAILQ_FIRST(&strmin->inqueue);
while (ctl) {
nctl = TAILQ_NEXT(ctl, next);
if (compare_with_wrap(tt, ctl->sinfo_ssn, MAX_SEQ) ||
(tt == ctl->sinfo_ssn)) {
/* this is deliverable now */
TAILQ_REMOVE(&strmin->inqueue, ctl, next);
/* 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_add_to_readq(stcb->sctp_ep, stcb,
ctl,
&stcb->sctp_socket->so_rcv, 1);
}
} else {
/* no more delivery now. */
break;
}
ctl = nctl;
}
/*
* now we must deliver things in queue the normal way if any are
* now ready.
*/
tt = strmin->last_sequence_delivered + 1;
ctl = TAILQ_FIRST(&strmin->inqueue);
while (ctl) {
nctl = TAILQ_NEXT(ctl, next);
if (tt == ctl->sinfo_ssn) {
/* this is deliverable now */
TAILQ_REMOVE(&strmin->inqueue, ctl, next);
/* 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_add_to_readq(stcb->sctp_ep, stcb,
ctl,
&stcb->sctp_socket->so_rcv, 1);
}
tt = strmin->last_sequence_delivered + 1;
} else {
break;
}
ctl = nctl;
}
}
void
sctp_handle_forward_tsn(struct sctp_tcb *stcb,
struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m, int offset)
{
/*
* ISSUES that MUST be fixed for ECN! When we are the sender of the
* forward TSN, when the SACK comes back that acknowledges the
* FWD-TSN we must reset the NONCE sum to match correctly. This will
* get quite tricky since we may have sent more data interveneing
* and must carefully account for what the SACK says on the nonce
* and any gaps that are reported. This work will NOT be done here,
* but I note it here since it is really related to PR-SCTP and
* FWD-TSN's
*/
/* 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, back_out_htsn;
unsigned int i, cnt_gone, fwd_sz, cumack_set_flag, m_size;
struct sctp_stream_in *strm;
struct sctp_tmit_chunk *chk, *at;
cumack_set_flag = 0;
asoc = &stcb->asoc;
cnt_gone = 0;
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 (compare_with_wrap(asoc->cumulative_tsn, new_cum_tsn, MAX_TSN) ||
asoc->cumulative_tsn == new_cum_tsn) {
/* Already got there ... */
return;
}
back_out_htsn = asoc->highest_tsn_inside_map;
if (compare_with_wrap(new_cum_tsn, asoc->highest_tsn_inside_map,
MAX_TSN)) {
asoc->highest_tsn_inside_map = new_cum_tsn;
if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
}
/*
* now we know the new TSN is more advanced, let's find the actual
* gap
*/
if ((compare_with_wrap(new_cum_tsn, asoc->mapping_array_base_tsn,
MAX_TSN)) ||
(new_cum_tsn == asoc->mapping_array_base_tsn)) {
gap = new_cum_tsn - asoc->mapping_array_base_tsn;
} else {
/* try to prevent underflow here */
gap = new_cum_tsn + (MAX_TSN - asoc->mapping_array_base_tsn) + 1;
}
if (gap > m_size) {
asoc->highest_tsn_inside_map = back_out_htsn;
if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
struct mbuf *oper;
/*
* out of range (of single byte chunks in the rwnd I
* give out). This must be an attacker.
*/
*abort_flag = 1;
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
(sizeof(uint32_t) * 3);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(SCTP_BUF_LEN(oper));
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33);
ippp++;
*ippp = asoc->highest_tsn_inside_map;
ippp++;
*ippp = new_cum_tsn;
}
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_PEER_FAULTY, oper);
return;
}
if (asoc->highest_tsn_inside_map >
asoc->mapping_array_base_tsn) {
gap = asoc->highest_tsn_inside_map -
asoc->mapping_array_base_tsn;
} else {
gap = asoc->highest_tsn_inside_map +
(MAX_TSN - asoc->mapping_array_base_tsn) + 1;
}
SCTP_STAT_INCR(sctps_fwdtsn_map_over);
cumack_set_flag = 1;
}
SCTP_TCB_LOCK_ASSERT(stcb);
for (i = 0; i <= gap; i++) {
SCTP_SET_TSN_PRESENT(asoc->mapping_array, i);
}
/*
* Now after marking all, slide thing forward but no sack please.
*/
sctp_sack_check(stcb, 0, 0, abort_flag);
if (*abort_flag)
return;
if (cumack_set_flag) {
/*
* fwd-tsn went outside my gap array - not a common
* occurance. Do the same thing we do when a cookie-echo
* arrives.
*/
asoc->highest_tsn_inside_map = new_cum_tsn - 1;
asoc->mapping_array_base_tsn = new_cum_tsn;
asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
}
asoc->last_echo_tsn = asoc->highest_tsn_inside_map;
}
/*************************************************************/
/* 2. Clear up re-assembly queue */
/*************************************************************/
/*
* First service it if pd-api is up, just in case we can progress it
* forward
*/
if (asoc->fragmented_delivery_inprogress) {
sctp_service_reassembly(stcb, asoc);
}
if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
/* For each one on here see if we need to toss it */
/*
* For now large messages held on the reasmqueue 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.
*/
chk = TAILQ_FIRST(&asoc->reasmqueue);
while (chk) {
at = TAILQ_NEXT(chk, sctp_next);
if (compare_with_wrap(asoc->cumulative_tsn,
chk->rec.data.TSN_seq, MAX_TSN) ||
asoc->cumulative_tsn == chk->rec.data.TSN_seq) {
/* It needs to be tossed */
TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
if (compare_with_wrap(chk->rec.data.TSN_seq,
asoc->tsn_last_delivered, MAX_TSN)) {
asoc->tsn_last_delivered =
chk->rec.data.TSN_seq;
asoc->str_of_pdapi =
chk->rec.data.stream_number;
asoc->ssn_of_pdapi =
chk->rec.data.stream_seq;
asoc->fragment_flags =
chk->rec.data.rcv_flags;
}
asoc->size_on_reasm_queue -= chk->send_size;
sctp_ucount_decr(asoc->cnt_on_reasm_queue);
cnt_gone++;
/* Clear up any stream problem */
if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
SCTP_DATA_UNORDERED &&
(compare_with_wrap(chk->rec.data.stream_seq,
asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered,
MAX_SEQ))) {
/*
* We must dump forward this streams
* sequence number if the chunk is
* not unordered that is being
* skipped. There is a chance that
* if the peer does not include the
* last fragment in its FWD-TSN we
* WILL have a problem here since
* you would have a partial chunk in
* queue that may not be
* deliverable. Also if a Partial
* delivery API as started the user
* may get a partial chunk. The next
* read returning a new chunk...
* really ugly but I see no way
* around it! Maybe a notify??
*/
asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered =
chk->rec.data.stream_seq;
}
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
} else {
/*
* Ok we have gone beyond the end of the
* fwd-tsn's mark. Some checks...
*/
if ((asoc->fragmented_delivery_inprogress) &&
(chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG)) {
uint32_t str_seq;
/*
* Special case PD-API is up and
* what we fwd-tsn' over includes
* one that had the LAST_FRAG. We no
* longer need to do the PD-API.
*/
asoc->fragmented_delivery_inprogress = 0;
str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi;
sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq);
}
break;
}
chk = at;
}
}
if (asoc->fragmented_delivery_inprogress) {
/*
* Ok we removed cnt_gone chunks in the PD-API queue that
* were being delivered. So now we must turn off the flag.
*/
uint32_t str_seq;
str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi;
sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq);
asoc->fragmented_delivery_inprogress = 0;
}
/*************************************************************/
/* 3. Update the PR-stream re-ordering queues */
/*************************************************************/
fwd_sz -= sizeof(*fwd);
if (m && fwd_sz) {
/* New method. */
unsigned int num_str;
struct sctp_strseq *stseq, strseqbuf;
offset += sizeof(*fwd);
num_str = fwd_sz / sizeof(struct sctp_strseq);
for (i = 0; i < num_str; i++) {
uint16_t st;
unsigned char *xx;
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;
/* Convert */
xx = (unsigned char *)&stseq[i];
st = ntohs(stseq[i].stream);
stseq[i].stream = st;
st = ntohs(stseq[i].sequence);
stseq[i].sequence = st;
/* now process */
if (stseq[i].stream >= asoc->streamincnt) {
/*
* It is arguable if we should continue.
* Since the peer sent bogus stream info we
* may be in deep trouble.. a return may be
* a better choice?
*/
continue;
}
strm = &asoc->strmin[stseq[i].stream];
if (compare_with_wrap(stseq[i].sequence,
strm->last_sequence_delivered, MAX_SEQ)) {
/* Update the sequence number */
strm->last_sequence_delivered =
stseq[i].sequence;
}
/* now kick the stream the new way */
sctp_kick_prsctp_reorder_queue(stcb, strm);
}
}
if (TAILQ_FIRST(&asoc->reasmqueue)) {
/* now lets kick out and check for more fragmented delivery */
sctp_deliver_reasm_check(stcb, &stcb->asoc);
}
}
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