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sctp_indata.c
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sctp_indata.c
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <netinet/sctp_os.h>
#include <sys/proc.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_crc32.h>
#include <netinet/sctp_lock_bsd.h>
/*
* NOTES: On the outbound side of things I need to check the sack timer to
* see if I should generate a sack into the chunk queue (if I have data to
* send that is and will be sending it .. for bundling.
*
* The callback in sctp_usrreq.c will get called when the socket is read from.
* This will cause sctp_service_queues() to get called on the top entry in
* the list.
*/
static uint32_t
sctp_add_chk_to_control(struct sctp_queued_to_read *control,
struct sctp_stream_in *strm,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_tmit_chunk *chk, int lock_held);
void
sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc);
}
/* Calculate what the rwnd would be */
uint32_t
sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
uint32_t calc = 0;
/*
* This is really set wrong with respect to a 1-2-m socket. Since
* the sb_cc is the count that everyone as put up. When we re-write
* sctp_soreceive then we will fix this so that ONLY this
* associations data is taken into account.
*/
if (stcb->sctp_socket == NULL) {
return (calc);
}
KASSERT(asoc->cnt_on_reasm_queue > 0 || asoc->size_on_reasm_queue == 0,
("size_on_reasm_queue is %u", asoc->size_on_reasm_queue));
KASSERT(asoc->cnt_on_all_streams > 0 || asoc->size_on_all_streams == 0,
("size_on_all_streams is %u", asoc->size_on_all_streams));
if (stcb->asoc.sb_cc == 0 &&
asoc->cnt_on_reasm_queue == 0 &&
asoc->cnt_on_all_streams == 0) {
/* Full rwnd granted */
calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND);
return (calc);
}
/* get actual space */
calc = (uint32_t)sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
/*
* take out what has NOT been put on socket queue and we yet hold
* for putting up.
*/
calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_reasm_queue +
asoc->cnt_on_reasm_queue * MSIZE));
calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_all_streams +
asoc->cnt_on_all_streams * MSIZE));
if (calc == 0) {
/* out of space */
return (calc);
}
/* what is the overhead of all these rwnd's */
calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
/*
* If the window gets too small due to ctrl-stuff, reduce it to 1,
* even it is 0. SWS engaged
*/
if (calc < stcb->asoc.my_rwnd_control_len) {
calc = 1;
}
return (calc);
}
/*
* Build out our readq entry based on the incoming packet.
*/
struct sctp_queued_to_read *
sctp_build_readq_entry(struct sctp_tcb *stcb,
struct sctp_nets *net,
uint32_t tsn, uint32_t ppid,
uint32_t context, uint16_t sid,
uint32_t mid, uint8_t flags,
struct mbuf *dm)
{
struct sctp_queued_to_read *read_queue_e = NULL;
sctp_alloc_a_readq(stcb, read_queue_e);
if (read_queue_e == NULL) {
goto failed_build;
}
memset(read_queue_e, 0, sizeof(struct sctp_queued_to_read));
read_queue_e->sinfo_stream = sid;
read_queue_e->sinfo_flags = (flags << 8);
read_queue_e->sinfo_ppid = ppid;
read_queue_e->sinfo_context = context;
read_queue_e->sinfo_tsn = tsn;
read_queue_e->sinfo_cumtsn = tsn;
read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
read_queue_e->mid = mid;
read_queue_e->top_fsn = read_queue_e->fsn_included = 0xffffffff;
TAILQ_INIT(&read_queue_e->reasm);
read_queue_e->whoFrom = net;
atomic_add_int(&net->ref_count, 1);
read_queue_e->data = dm;
read_queue_e->stcb = stcb;
read_queue_e->port_from = stcb->rport;
failed_build:
return (read_queue_e);
}
struct mbuf *
sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo)
{
struct sctp_extrcvinfo *seinfo;
struct sctp_sndrcvinfo *outinfo;
struct sctp_rcvinfo *rcvinfo;
struct sctp_nxtinfo *nxtinfo;
struct cmsghdr *cmh;
struct mbuf *ret;
int len;
int use_extended;
int provide_nxt;
if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) &&
sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) {
/* user does not want any ancillary data */
return (NULL);
}
len = 0;
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
}
seinfo = (struct sctp_extrcvinfo *)sinfo;
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
(seinfo->serinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) {
provide_nxt = 1;
len += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
} else {
provide_nxt = 0;
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
use_extended = 1;
len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
} else {
use_extended = 0;
len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
}
} else {
use_extended = 0;
}
ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
if (ret == NULL) {
/* No space */
return (ret);
}
SCTP_BUF_LEN(ret) = 0;
/* We need a CMSG header followed by the struct */
cmh = mtod(ret, struct cmsghdr *);
/*
* Make sure that there is no un-initialized padding between the
* cmsg header and cmsg data and after the cmsg data.
*/
memset(cmh, 0, len);
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
cmh->cmsg_level = IPPROTO_SCTP;
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
cmh->cmsg_type = SCTP_RCVINFO;
rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
rcvinfo->rcv_sid = sinfo->sinfo_stream;
rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
rcvinfo->rcv_flags = sinfo->sinfo_flags;
rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
rcvinfo->rcv_context = sinfo->sinfo_context;
rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
}
if (provide_nxt) {
cmh->cmsg_level = IPPROTO_SCTP;
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
cmh->cmsg_type = SCTP_NXTINFO;
nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
nxtinfo->nxt_sid = seinfo->serinfo_next_stream;
nxtinfo->nxt_flags = 0;
if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
nxtinfo->nxt_flags |= SCTP_UNORDERED;
}
if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
}
if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
nxtinfo->nxt_flags |= SCTP_COMPLETE;
}
nxtinfo->nxt_ppid = seinfo->serinfo_next_ppid;
nxtinfo->nxt_length = seinfo->serinfo_next_length;
nxtinfo->nxt_assoc_id = seinfo->serinfo_next_aid;
cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
cmh->cmsg_level = IPPROTO_SCTP;
outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
if (use_extended) {
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
cmh->cmsg_type = SCTP_EXTRCV;
memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
} else {
cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
cmh->cmsg_type = SCTP_SNDRCV;
*outinfo = *sinfo;
SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
}
}
return (ret);
}
static void
sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
{
uint32_t gap, i, cumackp1;
int fnd = 0;
int in_r = 0, in_nr = 0;
if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
return;
}
cumackp1 = asoc->cumulative_tsn + 1;
if (SCTP_TSN_GT(cumackp1, tsn)) {
/*
* this tsn is behind the cum ack and thus we don't need to
* worry about it being moved from one to the other.
*/
return;
}
SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
in_r = SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap);
in_nr = SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap);
if ((in_r == 0) && (in_nr == 0)) {
#ifdef INVARIANTS
panic("Things are really messed up now");
#else
SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
sctp_print_mapping_array(asoc);
#endif
}
if (in_nr == 0)
SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
if (in_r)
SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
asoc->highest_tsn_inside_nr_map = tsn;
}
if (tsn == asoc->highest_tsn_inside_map) {
/* We must back down to see what the new highest is */
for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
asoc->highest_tsn_inside_map = i;
fnd = 1;
break;
}
}
if (!fnd) {
asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
}
}
}
static int
sctp_place_control_in_stream(struct sctp_stream_in *strm,
struct sctp_association *asoc,
struct sctp_queued_to_read *control)
{
struct sctp_queued_to_read *at;
struct sctp_readhead *q;
uint8_t flags, unordered;
flags = (control->sinfo_flags >> 8);
unordered = flags & SCTP_DATA_UNORDERED;
if (unordered) {
q = &strm->uno_inqueue;
if (asoc->idata_supported == 0) {
if (!TAILQ_EMPTY(q)) {
/*
* Only one stream can be here in old style
* -- abort
*/
return (-1);
}
TAILQ_INSERT_TAIL(q, control, next_instrm);
control->on_strm_q = SCTP_ON_UNORDERED;
return (0);
}
} else {
q = &strm->inqueue;
}
if ((flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
control->end_added = 1;
control->first_frag_seen = 1;
control->last_frag_seen = 1;
}
if (TAILQ_EMPTY(q)) {
/* Empty queue */
TAILQ_INSERT_HEAD(q, control, next_instrm);
if (unordered) {
control->on_strm_q = SCTP_ON_UNORDERED;
} else {
control->on_strm_q = SCTP_ON_ORDERED;
}
return (0);
} else {
TAILQ_FOREACH(at, q, next_instrm) {
if (SCTP_MID_GT(asoc->idata_supported, at->mid, control->mid)) {
/*
* one in queue is bigger than the new one,
* insert before this one
*/
TAILQ_INSERT_BEFORE(at, control, next_instrm);
if (unordered) {
control->on_strm_q = SCTP_ON_UNORDERED;
} else {
control->on_strm_q = SCTP_ON_ORDERED;
}
break;
} else if (SCTP_MID_EQ(asoc->idata_supported, at->mid, control->mid)) {
/*
* Gak, He sent me a duplicate msg id
* number?? return -1 to abort.
*/
return (-1);
} else {
if (TAILQ_NEXT(at, next_instrm) == NULL) {
/*
* We are at the end, insert it
* after this one
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, at,
SCTP_STR_LOG_FROM_INSERT_TL);
}
TAILQ_INSERT_AFTER(q, at, control, next_instrm);
if (unordered) {
control->on_strm_q = SCTP_ON_UNORDERED;
} else {
control->on_strm_q = SCTP_ON_ORDERED;
}
break;
}
}
}
}
return (0);
}
static void
sctp_abort_in_reasm(struct sctp_tcb *stcb,
struct sctp_queued_to_read *control,
struct sctp_tmit_chunk *chk,
int *abort_flag, int opspot)
{
char msg[SCTP_DIAG_INFO_LEN];
struct mbuf *oper;
if (stcb->asoc.idata_supported) {
snprintf(msg, sizeof(msg),
"Reass %x,CF:%x,TSN=%8.8x,SID=%4.4x,FSN=%8.8x,MID:%8.8x",
opspot,
control->fsn_included,
chk->rec.data.tsn,
chk->rec.data.sid,
chk->rec.data.fsn, chk->rec.data.mid);
} else {
snprintf(msg, sizeof(msg),
"Reass %x,CI:%x,TSN=%8.8x,SID=%4.4x,FSN=%4.4x,SSN:%4.4x",
opspot,
control->fsn_included,
chk->rec.data.tsn,
chk->rec.data.sid,
chk->rec.data.fsn,
(uint16_t)chk->rec.data.mid);
}
oper = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
sctp_m_freem(chk->data);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
}
static void
sctp_clean_up_control(struct sctp_tcb *stcb, struct sctp_queued_to_read *control)
{
/*
* The control could not be placed and must be cleaned.
*/
struct sctp_tmit_chunk *chk, *nchk;
TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
TAILQ_REMOVE(&control->reasm, chk, sctp_next);
if (chk->data)
sctp_m_freem(chk->data);
chk->data = NULL;
sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
}
sctp_free_remote_addr(control->whoFrom);
if (control->data) {
sctp_m_freem(control->data);
control->data = NULL;
}
sctp_free_a_readq(stcb, control);
}
/*
* Queue the chunk either right into the socket buffer if it is the next one
* to go OR put it in the correct place in the delivery queue. If we do
* append to the so_buf, keep doing so until we are out of order as
* long as the control's entered are non-fragmented.
*/
static void
sctp_queue_data_to_stream(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_queued_to_read *control, int *abort_flag, int *need_reasm)
{
/*
* FIX-ME maybe? What happens when the ssn wraps? If we are getting
* all the data in one stream this could happen quite rapidly. One
* could use the TSN to keep track of things, but this scheme breaks
* down in the other type of stream usage that could occur. Send a
* single msg to stream 0, send 4Billion messages to stream 1, now
* send a message to stream 0. You have a situation where the TSN
* has wrapped but not in the stream. Is this worth worrying about
* or should we just change our queue sort at the bottom to be by
* TSN.
*
* Could it also be legal for a peer to send ssn 1 with TSN 2 and
* ssn 2 with TSN 1? If the peer is doing some sort of funky TSN/SSN
* assignment this could happen... and I don't see how this would be
* a violation. So for now I am undecided an will leave the sort by
* SSN alone. Maybe a hybred approach is the answer
*
*/
struct sctp_queued_to_read *at;
int queue_needed;
uint32_t nxt_todel;
struct mbuf *op_err;
struct sctp_stream_in *strm;
char msg[SCTP_DIAG_INFO_LEN];
strm = &asoc->strmin[control->sinfo_stream];
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
}
if (SCTP_MID_GT((asoc->idata_supported), strm->last_mid_delivered, control->mid)) {
/* The incoming sseq is behind where we last delivered? */
SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ: %u delivered: %u from peer, Abort association\n",
strm->last_mid_delivered, control->mid);
/*
* throw it in the stream so it gets cleaned up in
* association destruction
*/
TAILQ_INSERT_HEAD(&strm->inqueue, control, next_instrm);
if (asoc->idata_supported) {
snprintf(msg, sizeof(msg), "Delivered MID=%8.8x, got TSN=%8.8x, SID=%4.4x, MID=%8.8x",
strm->last_mid_delivered, control->sinfo_tsn,
control->sinfo_stream, control->mid);
} else {
snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
(uint16_t)strm->last_mid_delivered,
control->sinfo_tsn,
control->sinfo_stream,
(uint16_t)control->mid);
}
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
return;
}
queue_needed = 1;
asoc->size_on_all_streams += control->length;
sctp_ucount_incr(asoc->cnt_on_all_streams);
nxt_todel = strm->last_mid_delivered + 1;
if (SCTP_MID_EQ(asoc->idata_supported, nxt_todel, control->mid)) {
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
so = SCTP_INP_SO(stcb->sctp_ep);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
/* can be delivered right away? */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
}
/* EY it wont be queued if it could be delivered directly */
queue_needed = 0;
if (asoc->size_on_all_streams >= control->length) {
asoc->size_on_all_streams -= control->length;
} else {
#ifdef INVARIANTS
panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length);
#else
asoc->size_on_all_streams = 0;
#endif
}
sctp_ucount_decr(asoc->cnt_on_all_streams);
strm->last_mid_delivered++;
sctp_mark_non_revokable(asoc, control->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1,
SCTP_READ_LOCK_NOT_HELD, SCTP_SO_LOCKED);
TAILQ_FOREACH_SAFE(control, &strm->inqueue, next_instrm, at) {
/* all delivered */
nxt_todel = strm->last_mid_delivered + 1;
if (SCTP_MID_EQ(asoc->idata_supported, nxt_todel, control->mid) &&
(((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG)) {
if (control->on_strm_q == SCTP_ON_ORDERED) {
TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
if (asoc->size_on_all_streams >= control->length) {
asoc->size_on_all_streams -= control->length;
} else {
#ifdef INVARIANTS
panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length);
#else
asoc->size_on_all_streams = 0;
#endif
}
sctp_ucount_decr(asoc->cnt_on_all_streams);
#ifdef INVARIANTS
} else {
panic("Huh control: %p is on_strm_q: %d",
control, control->on_strm_q);
#endif
}
control->on_strm_q = 0;
strm->last_mid_delivered++;
/*
* We ignore the return of deliver_data here
* since we always can hold the chunk on the
* d-queue. And we have a finite number that
* can be delivered from the strq.
*/
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
sctp_log_strm_del(control, NULL,
SCTP_STR_LOG_FROM_IMMED_DEL);
}
sctp_mark_non_revokable(asoc, control->sinfo_tsn);
sctp_add_to_readq(stcb->sctp_ep, stcb,
control,
&stcb->sctp_socket->so_rcv, 1,
SCTP_READ_LOCK_NOT_HELD,
SCTP_SO_LOCKED);
continue;
} else if (SCTP_MID_EQ(asoc->idata_supported, nxt_todel, control->mid)) {
*need_reasm = 1;
}
break;
}
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
if (queue_needed) {
/*
* Ok, we did not deliver this guy, find the correct place
* to put it on the queue.
*/
if (sctp_place_control_in_stream(strm, asoc, control)) {
snprintf(msg, sizeof(msg),
"Queue to str MID: %u duplicate",
control->mid);
sctp_clean_up_control(stcb, control);
op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
*abort_flag = 1;
}
}
}
static void
sctp_setup_tail_pointer(struct sctp_queued_to_read *control)
{
struct mbuf *m, *prev = NULL;
struct sctp_tcb *stcb;
stcb = control->stcb;
control->held_length = 0;
control->length = 0;
m = control->data;
while (m) {
if (SCTP_BUF_LEN(m) == 0) {
/* Skip mbufs with NO length */
if (prev == NULL) {
/* First one */
control->data = sctp_m_free(m);
m = control->data;
} else {
SCTP_BUF_NEXT(prev) = sctp_m_free(m);
m = SCTP_BUF_NEXT(prev);
}
if (m == NULL) {
control->tail_mbuf = prev;
}
continue;
}
prev = m;
atomic_add_int(&control->length, SCTP_BUF_LEN(m));
if (control->on_read_q) {
/*
* On read queue so we must increment the SB stuff,
* we assume caller has done any locks of SB.
*/
sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
}
m = SCTP_BUF_NEXT(m);
}
if (prev) {
control->tail_mbuf = prev;
}
}
static void
sctp_add_to_tail_pointer(struct sctp_queued_to_read *control, struct mbuf *m, uint32_t *added)
{
struct mbuf *prev = NULL;
struct sctp_tcb *stcb;
stcb = control->stcb;
if (stcb == NULL) {
#ifdef INVARIANTS
panic("Control broken");
#else
return;
#endif
}
if (control->tail_mbuf == NULL) {
/* TSNH */
control->data = m;
sctp_setup_tail_pointer(control);
return;
}
control->tail_mbuf->m_next = m;
while (m) {
if (SCTP_BUF_LEN(m) == 0) {
/* Skip mbufs with NO length */
if (prev == NULL) {
/* First one */
control->tail_mbuf->m_next = sctp_m_free(m);
m = control->tail_mbuf->m_next;
} else {
SCTP_BUF_NEXT(prev) = sctp_m_free(m);
m = SCTP_BUF_NEXT(prev);
}
if (m == NULL) {
control->tail_mbuf = prev;
}
continue;
}
prev = m;
if (control->on_read_q) {
/*
* On read queue so we must increment the SB stuff,
* we assume caller has done any locks of SB.
*/
sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
}
*added += SCTP_BUF_LEN(m);
atomic_add_int(&control->length, SCTP_BUF_LEN(m));
m = SCTP_BUF_NEXT(m);
}
if (prev) {
control->tail_mbuf = prev;
}
}
static void
sctp_build_readq_entry_from_ctl(struct sctp_queued_to_read *nc, struct sctp_queued_to_read *control)
{
memset(nc, 0, sizeof(struct sctp_queued_to_read));
nc->sinfo_stream = control->sinfo_stream;
nc->mid = control->mid;
TAILQ_INIT(&nc->reasm);
nc->top_fsn = control->top_fsn;
nc->mid = control->mid;
nc->sinfo_flags = control->sinfo_flags;
nc->sinfo_ppid = control->sinfo_ppid;
nc->sinfo_context = control->sinfo_context;
nc->fsn_included = 0xffffffff;
nc->sinfo_tsn = control->sinfo_tsn;
nc->sinfo_cumtsn = control->sinfo_cumtsn;
nc->sinfo_assoc_id = control->sinfo_assoc_id;
nc->whoFrom = control->whoFrom;
atomic_add_int(&nc->whoFrom->ref_count, 1);
nc->stcb = control->stcb;
nc->port_from = control->port_from;
}
static void
sctp_reset_a_control(struct sctp_queued_to_read *control,
struct sctp_inpcb *inp, uint32_t tsn)
{
control->fsn_included = tsn;
if (control->on_read_q) {
/*
* We have to purge it from there, hopefully this will work
* :-)
*/
TAILQ_REMOVE(&inp->read_queue, control, next);
control->on_read_q = 0;
}
}
static int
sctp_handle_old_unordered_data(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_stream_in *strm,
struct sctp_queued_to_read *control,
uint32_t pd_point,
int inp_read_lock_held)
{
/*
* Special handling for the old un-ordered data chunk. All the
* chunks/TSN's go to mid 0. So we have to do the old style watching
* to see if we have it all. If you return one, no other control
* entries on the un-ordered queue will be looked at. In theory
* there should be no others entries in reality, unless the guy is
* sending both unordered NDATA and unordered DATA...
*/
struct sctp_tmit_chunk *chk, *lchk, *tchk;
uint32_t fsn;
struct sctp_queued_to_read *nc;
int cnt_added;
if (control->first_frag_seen == 0) {
/* Nothing we can do, we have not seen the first piece yet */
return (1);
}
/* Collapse any we can */
cnt_added = 0;
restart:
fsn = control->fsn_included + 1;
/* Now what can we add? */
TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, lchk) {
if (chk->rec.data.fsn == fsn) {
/* Ok lets add it */
sctp_alloc_a_readq(stcb, nc);
if (nc == NULL) {
break;
}
memset(nc, 0, sizeof(struct sctp_queued_to_read));
TAILQ_REMOVE(&control->reasm, chk, sctp_next);
sctp_add_chk_to_control(control, strm, stcb, asoc, chk, SCTP_READ_LOCK_NOT_HELD);
fsn++;
cnt_added++;
chk = NULL;
if (control->end_added) {
/* We are done */
if (!TAILQ_EMPTY(&control->reasm)) {
/*
* Ok we have to move anything left
* on the control queue to a new
* control.
*/
sctp_build_readq_entry_from_ctl(nc, control);
tchk = TAILQ_FIRST(&control->reasm);
if (tchk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
TAILQ_REMOVE(&control->reasm, tchk, sctp_next);
if (asoc->size_on_reasm_queue >= tchk->send_size) {
asoc->size_on_reasm_queue -= tchk->send_size;
} else {
#ifdef INVARIANTS
panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, tchk->send_size);
#else
asoc->size_on_reasm_queue = 0;
#endif
}
sctp_ucount_decr(asoc->cnt_on_reasm_queue);
nc->first_frag_seen = 1;
nc->fsn_included = tchk->rec.data.fsn;
nc->data = tchk->data;
nc->sinfo_ppid = tchk->rec.data.ppid;
nc->sinfo_tsn = tchk->rec.data.tsn;
sctp_mark_non_revokable(asoc, tchk->rec.data.tsn);
tchk->data = NULL;
sctp_free_a_chunk(stcb, tchk, SCTP_SO_NOT_LOCKED);
sctp_setup_tail_pointer(nc);
tchk = TAILQ_FIRST(&control->reasm);
}
/* Spin the rest onto the queue */
while (tchk) {
TAILQ_REMOVE(&control->reasm, tchk, sctp_next);
TAILQ_INSERT_TAIL(&nc->reasm, tchk, sctp_next);
tchk = TAILQ_FIRST(&control->reasm);
}
/*
* Now lets add it to the queue
* after removing control
*/
TAILQ_INSERT_TAIL(&strm->uno_inqueue, nc, next_instrm);
nc->on_strm_q = SCTP_ON_UNORDERED;
if (control->on_strm_q) {
TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
control->on_strm_q = 0;
}
}
if (control->pdapi_started) {
strm->pd_api_started = 0;
control->pdapi_started = 0;
}
if (control->on_strm_q) {
TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
control->on_strm_q = 0;
SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
}
if (control->on_read_q == 0) {
sctp_add_to_readq(stcb->sctp_ep, stcb, control,
&stcb->sctp_socket->so_rcv, control->end_added,
inp_read_lock_held, SCTP_SO_NOT_LOCKED);
}
sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
if ((nc->first_frag_seen) && !TAILQ_EMPTY(&nc->reasm)) {
/*
* Switch to the new guy and
* continue
*/
control = nc;
goto restart;
} else {
if (nc->on_strm_q == 0) {
sctp_free_a_readq(stcb, nc);
}
}
return (1);
} else {
sctp_free_a_readq(stcb, nc);
}
} else {
/* Can't add more */
break;
}
}
if (cnt_added && strm->pd_api_started) {
sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
}
if ((control->length > pd_point) && (strm->pd_api_started == 0)) {
strm->pd_api_started = 1;
control->pdapi_started = 1;
sctp_add_to_readq(stcb->sctp_ep, stcb, control,
&stcb->sctp_socket->so_rcv, control->end_added,
inp_read_lock_held, SCTP_SO_NOT_LOCKED);
sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
return (0);
} else {
return (1);
}
}
static void
sctp_inject_old_unordered_data(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_queued_to_read *control,
struct sctp_tmit_chunk *chk,
int *abort_flag)
{
struct sctp_tmit_chunk *at;
int inserted;
/*
* Here we need to place the chunk into the control structure sorted
* in the correct order.
*/
if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
/* Its the very first one. */
SCTPDBG(SCTP_DEBUG_XXX,
"chunk is a first fsn: %u becomes fsn_included\n",
chk->rec.data.fsn);
at = TAILQ_FIRST(&control->reasm);
if (at && SCTP_TSN_GT(chk->rec.data.fsn, at->rec.data.fsn)) {
/*
* The first chunk in the reassembly is a smaller
* TSN than this one, even though this has a first,
* it must be from a subsequent msg.
*/
goto place_chunk;
}
if (control->first_frag_seen) {
/*
* In old un-ordered we can reassembly on one
* control multiple messages. As long as the next
* FIRST is greater then the old first (TSN i.e. FSN
* wise)
*/
struct mbuf *tdata;
uint32_t tmp;
if (SCTP_TSN_GT(chk->rec.data.fsn, control->fsn_included)) {
/*
* Easy way the start of a new guy beyond
* the lowest
*/
goto place_chunk;
}
if ((chk->rec.data.fsn == control->fsn_included) ||
(control->pdapi_started)) {
/*
* Ok this should not happen, if it does we
* started the pd-api on the higher TSN
* (since the equals part is a TSN failure
* it must be that).
*
* We are completly hosed in that case since
* I have no way to recover. This really
* will only happen if we can get more TSN's
* higher before the pd-api-point.
*/
sctp_abort_in_reasm(stcb, control, chk,
abort_flag,
SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);