diff options
Diffstat (limited to 'netwerk/sctp/src/netinet/sctp_indata.c')
| -rwxr-xr-x | netwerk/sctp/src/netinet/sctp_indata.c | 5373 |
1 files changed, 5373 insertions, 0 deletions
diff --git a/netwerk/sctp/src/netinet/sctp_indata.c b/netwerk/sctp/src/netinet/sctp_indata.c new file mode 100755 index 000000000..f697d0ced --- /dev/null +++ b/netwerk/sctp/src/netinet/sctp_indata.c @@ -0,0 +1,5373 @@ +/*- + * 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. + */ + +#ifdef __FreeBSD__ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: head/sys/netinet/sctp_indata.c 280440 2015-03-24 15:05:36Z tuexen $"); +#endif + +#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) +{ + asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); +} + +/* Calculate what the rwnd would be */ +uint32_t +sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) +{ + uint32_t calc = 0; + + /* + * This is really set wrong with respect to a 1-2-m socket. Since + * the sb_cc is the count that everyone as put up. When we re-write + * sctp_soreceive then we will fix this so that ONLY this + * associations data is taken into account. + */ + if (stcb->sctp_socket == NULL) + return (calc); + + if (stcb->asoc.sb_cc == 0 && + asoc->size_on_reasm_queue == 0 && + asoc->size_on_all_streams == 0) { + /* Full rwnd granted */ + calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND); + return (calc); + } + /* get actual space */ + calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); + + /* + * take out what has NOT been put on socket queue and we yet hold + * for putting up. + */ + calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_reasm_queue + + asoc->cnt_on_reasm_queue * MSIZE)); + calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_all_streams + + asoc->cnt_on_all_streams * MSIZE)); + + if (calc == 0) { + /* out of space */ + return (calc); + } + + /* what is the overhead of all these rwnd's */ + calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); + /* If the window gets too small due to ctrl-stuff, reduce it + * to 1, even it is 0. SWS engaged + */ + if (calc < stcb->asoc.my_rwnd_control_len) { + calc = 1; + } + return (calc); +} + + + +/* + * Build out our readq entry based on the incoming packet. + */ +struct sctp_queued_to_read * +sctp_build_readq_entry(struct sctp_tcb *stcb, + struct sctp_nets *net, + uint32_t tsn, uint32_t ppid, + uint32_t context, uint16_t stream_no, + 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 = 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_extrcvinfo *seinfo; + struct sctp_sndrcvinfo *outinfo; + struct sctp_rcvinfo *rcvinfo; + struct sctp_nxtinfo *nxtinfo; +#if defined(__Userspace_os_Windows) + WSACMSGHDR *cmh; +#else + struct cmsghdr *cmh; +#endif + 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->sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) { + provide_nxt = 1; + len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); + } 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 */ +#if defined(__Userspace_os_Windows) + cmh = mtod(ret, WSACMSGHDR *); +#else + cmh = mtod(ret, struct cmsghdr *); +#endif + /* + * 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; +#if defined(__Userspace_os_Windows) + cmh = (WSACMSGHDR *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo))); +#else + cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo))); +#endif + 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->sreinfo_next_stream; + nxtinfo->nxt_flags = 0; + if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) { + nxtinfo->nxt_flags |= SCTP_UNORDERED; + } + if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) { + nxtinfo->nxt_flags |= SCTP_NOTIFICATION; + } + if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) { + nxtinfo->nxt_flags |= SCTP_COMPLETE; + } + nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid; + nxtinfo->nxt_length = seinfo->sreinfo_next_length; + nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid; +#if defined(__Userspace_os_Windows) + cmh = (WSACMSGHDR *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo))); +#else + cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo))); +#endif + 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; + + 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); + if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { + SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn); + sctp_print_mapping_array(asoc); +#ifdef INVARIANTS + panic("Things are really messed up now!!"); +#endif + } + SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); + 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; + } + } +} + + +/* + * 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, *nchk; + uint16_t nxt_todel; + uint16_t stream_no; + int end = 0; + int cntDel; + struct sctp_queued_to_read *control, *ctl, *nctl; + + if (stcb == NULL) + return; + + cntDel = stream_no = 0; + if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || + (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || + (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { + /* socket above is long gone or going.. */ + abandon: + asoc->fragmented_delivery_inprogress = 0; + TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { + 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_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + /*sa_ignore FREED_MEMORY*/ + } + return; + } + SCTP_TCB_LOCK_ASSERT(stcb); + TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { + 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_mark_non_revokable(asoc, chk->rec.data.TSN_seq); + sctp_add_to_readq(stcb->sctp_ep, + stcb, control, &stcb->sctp_socket->so_rcv, end, + SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); + cntDel++; + } else { + if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) + end = 1; + else + end = 0; + sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); + 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.state & SCTP_STATE_ABOUT_TO_BE_FREED) { + goto abandon; + } else { +#ifdef INVARIANTS + 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 ??"); +#else + if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { + SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); + } + SCTP_PRINTF("Bad chunking ??\n"); + SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); + +#endif + goto abandon; + } + } + 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_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + + 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; + TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) { + /* Deliver more if we can. */ + if (nxt_todel == ctl->sinfo_ssn) { + 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_mark_non_revokable(asoc, ctl->sinfo_tsn); + sctp_add_to_readq(stcb->sctp_ep, stcb, + ctl, + &stcb->sctp_socket->so_rcv, 1, + SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); + } else { + break; + } + nxt_todel = strm->last_sequence_delivered + 1; + } + break; + } + } +} + +/* + * 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 *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + + 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_BASE_SYSCTL(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 (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) { + /* The incoming sseq is behind where we last delivered? */ + SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", + control->sinfo_ssn, strm->last_sequence_delivered); + protocol_error: + /* + * throw it in the stream so it gets cleaned up in + * association destruction + */ + TAILQ_INSERT_HEAD(&strm->inqueue, control, next); + snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + strm->last_sequence_delivered, control->sinfo_tsn, + control->sinfo_stream, control->sinfo_ssn); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_1; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + return; + + } + if (nxt_todel == control->sinfo_ssn) { + /* can be delivered right away? */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { + sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); + } + /* EY it wont be queued if it could be delivered directly*/ + queue_needed = 0; + asoc->size_on_all_streams -= control->length; + sctp_ucount_decr(asoc->cnt_on_all_streams); + strm->last_sequence_delivered++; + + sctp_mark_non_revokable(asoc, control->sinfo_tsn); + sctp_add_to_readq(stcb->sctp_ep, stcb, + control, + &stcb->sctp_socket->so_rcv, 1, + SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); + TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) { + /* all delivered */ + nxt_todel = strm->last_sequence_delivered + 1; + if (nxt_todel == control->sinfo_ssn) { + 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_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { + sctp_log_strm_del(control, NULL, + SCTP_STR_LOG_FROM_IMMED_DEL); + } + sctp_mark_non_revokable(asoc, control->sinfo_tsn); + sctp_add_to_readq(stcb->sctp_ep, stcb, + control, + &stcb->sctp_socket->so_rcv, 1, + SCTP_READ_LOCK_NOT_HELD, + SCTP_SO_NOT_LOCKED); + continue; + } + break; + } + } + if (queue_needed) { + /* + * Ok, we did not deliver this guy, find the correct place + * to put it on the queue. + */ + if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) { + goto protocol_error; + } + if (TAILQ_EMPTY(&strm->inqueue)) { + /* Empty queue */ + if (SCTP_BASE_SYSCTL(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 (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) { + /* + * one in queue is bigger than the + * new one, insert before this one + */ + if (SCTP_BASE_SYSCTL(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); + if (control->whoFrom) { + sctp_free_remote_addr(control->whoFrom); + control->whoFrom = NULL; + } + 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_BASE_SYSCTL(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; + TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) { + 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++; + } + 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, pd_point; + + 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 (stcb->sctp_socket) { + pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, + stcb->sctp_ep->partial_delivery_point); + } else { + pd_point = stcb->sctp_ep->partial_delivery_point; + } + if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_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 *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + uint32_t cum_ackp1, prev_tsn, post_tsn; + 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"); + snprintf(msg, sizeof(msg), + "Expected B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + 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; + } 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"); + snprintf(msg, sizeof(msg), + "Didn't expect B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + 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; + } 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); + snprintf(msg, sizeof(msg), + "Expected SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + asoc->str_of_pdapi, + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_4; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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); + snprintf(msg, sizeof(msg), + "Expected SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + asoc->ssn_of_pdapi, + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_5; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + } + } + } + return; + } + /* Find its place */ + TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { + if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) { + /* + * 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_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + return; + } else { + 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"); + snprintf(msg, sizeof(msg), + "Can't handle B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_6; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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. + */ + SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sid:%d not the same as at:%d\n", + chk->rec.data.stream_number, + prev->rec.data.stream_number); + snprintf(msg, sizeof(msg), + "Expect SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + prev->rec.data.stream_number, + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_7; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + return; + } + if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != + (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) { + /* + * Huh, need the same ordering here, + * they must be the same. + */ + SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, U-bit not constant\n"); + snprintf(msg, sizeof(msg), + "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d", + (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0, + chk->rec.data.TSN_seq, + (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_7; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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); + snprintf(msg, sizeof(msg), + "Expect SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + prev->rec.data.stream_seq, + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_8; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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"); + snprintf(msg, sizeof(msg), + "Expect B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_9; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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"); + snprintf(msg, sizeof(msg), + "Expect only E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_10; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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"); + snprintf(msg, sizeof(msg), + "Didn't expect E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_11; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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); + snprintf(msg, sizeof(msg), + "Required SID %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + next->rec.data.stream_number, + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_12; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + return; + } + if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != + (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) { + /* + * Huh, need the same ordering here, + * they must be the same. + */ + SCTPDBG(SCTP_DEBUG_INDATA1, "Next check - Gak, Evil plot, U-bit not constant\n"); + snprintf(msg, sizeof(msg), + "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d", + (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0, + chk->rec.data.TSN_seq, + (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_12; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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); + snprintf(msg, sizeof(msg), + "Required SSN %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + next->rec.data.stream_seq, + chk->rec.data.TSN_seq, + chk->rec.data.stream_number, + chk->rec.data.stream_seq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_13; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *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 (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) { + /* 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 the_len; + int need_reasm_check = 0; + uint16_t strmno, strmseq; + struct mbuf *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + 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; + if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { + asoc->send_sack = 1; + } + protocol_id = ch->dp.protocol_id; + ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); + } + if (stcb == NULL) { + return (0); + } + SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); + if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { + /* It is a duplicate */ + SCTP_STAT_INCR(sctps_recvdupdata); + if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { + /* Record a dup for the next outbound sack */ + asoc->dup_tsns[asoc->numduptsns] = tsn; + asoc->numduptsns++; + } + asoc->send_sack = 1; + return (0); + } + /* Calculate the number of TSN's between the base and this TSN */ + SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); + if (gap >= (SCTP_MAPPING_ARRAY << 3)) { + /* Can't hold the bit in the mapping at max array, toss it */ + return (0); + } + if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { + SCTP_TCB_LOCK_ASSERT(stcb); + if (sctp_expand_mapping_array(asoc, gap)) { + /* Can't expand, drop it */ + return (0); + } + } + if (SCTP_TSN_GT(tsn, *high_tsn)) { + *high_tsn = tsn; + } + /* See if we have received this one already */ + if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) || + SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) { + SCTP_STAT_INCR(sctps_recvdupdata); + if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { + /* Record a dup for the next outbound sack */ + asoc->dup_tsns[asoc->numduptsns] = tsn; + asoc->numduptsns++; + } + asoc->send_sack = 1; + return (0); + } + /* + * Check to see about the GONE flag, duplicates would cause a sack + * to be sent up above + */ + if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || + (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || + (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) { + /* + * wait a minute, this guy is gone, there is no longer a + * receiver. Send peer an ABORT! + */ + op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + return (0); + } + /* + * Now before going further we see if there is room. If NOT then we + * MAY let one through only IF this TSN is the one we are waiting + * for on a partial delivery API. + */ + + /* now do the tests */ + if (((asoc->cnt_on_all_streams + + asoc->cnt_on_reasm_queue + + asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || + (((int)asoc->my_rwnd) <= 0)) { + /* + * When we have NO room in the rwnd we check to make sure + * the reader is doing its job... + */ + if (stcb->sctp_socket->so_rcv.sb_cc) { + /* some to read, wake-up */ +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + struct socket *so; + + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + /* assoc was freed while we were unlocked */ + SCTP_SOCKET_UNLOCK(so, 1); + return (0); + } +#endif + sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } + /* now is it in the mapping array of what we have accepted? */ + if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) && + SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { + /* Nope not in the valid range dump it */ + sctp_set_rwnd(stcb, asoc); + if ((asoc->cnt_on_all_streams + + asoc->cnt_on_reasm_queue + + asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { + SCTP_STAT_INCR(sctps_datadropchklmt); + } else { + SCTP_STAT_INCR(sctps_datadroprwnd); + } + *break_flag = 1; + return (0); + } + } + 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_NOWAIT, 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->nr_mapping_array, gap); + if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { + asoc->highest_tsn_inside_nr_map = tsn; + } + if (tsn == (asoc->cumulative_tsn + 1)) { + /* Update cum-ack */ + asoc->cumulative_tsn = tsn; + } + return (0); + } + /* + * 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 + SCTP_TCB_LOCK_ASSERT(stcb); + if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { + asoc->tsn_in_at = 0; + asoc->tsn_in_wrapped = 1; + } + asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; + asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; + asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; + asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; + asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; + asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; + asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; + asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; + asoc->tsn_in_at++; +#endif + if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && + (TAILQ_EMPTY(&asoc->resetHead)) && + (chunk_flags & SCTP_DATA_UNORDERED) == 0 && + SCTP_SSN_GE(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); + + snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + asoc->strmin[strmno].last_sequence_delivered, + tsn, strmno, strmseq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_14; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + return (0); + } + /************************************ + * 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_NOWAIT); +#ifdef SCTP_MBUF_LOGGING + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { + sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY); + } +#endif + } else { + /* We can steal the last chunk */ + int l_len; + dmbuf = *m; + /* lop off the top part */ + m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); + if (SCTP_BUF_NEXT(dmbuf) == NULL) { + l_len = SCTP_BUF_LEN(dmbuf); + } else { + /* need to count up the size hopefully + * does not hit this to often :-0 + */ + struct mbuf *lat; + + l_len = 0; + for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) { + l_len += SCTP_BUF_LEN(lat); + } + } + if (l_len > the_len) { + /* Trim the end round bytes off too */ + m_adj(dmbuf, -(l_len - the_len)); + } + } + if (dmbuf == NULL) { + SCTP_STAT_INCR(sctps_nomem); + return (0); + } + if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && + asoc->fragmented_delivery_inprogress == 0 && + TAILQ_EMPTY(&asoc->resetHead) && + ((ordered == 0) || + ((uint16_t)(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, + strmno, strmseq, + chunk_flags, + dmbuf); + if (control == NULL) { + goto failed_express_del; + } + SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); + if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { + asoc->highest_tsn_inside_nr_map = tsn; + } + sctp_add_to_readq(stcb->sctp_ep, stcb, + control, &stcb->sctp_socket->so_rcv, + 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); + + if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { + /* for ordered, bump what we delivered */ + asoc->strmin[strmno].last_sequence_delivered++; + } + SCTP_STAT_INCR(sctps_recvexpress); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { + sctp_log_strm_del_alt(stcb, tsn, 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; + + if (chunk_flags & SCTP_DATA_LAST_FRAG) { + end = 1; + } + 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_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); + if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { + asoc->highest_tsn_inside_nr_map = tsn; + } + SCTP_STAT_INCR(sctps_recvexpressm); + 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 (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { + SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); + if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { + asoc->highest_tsn_inside_nr_map = tsn; + } + } else { + SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); + if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) { + asoc->highest_tsn_inside_map = tsn; + } + } + 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, + 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; + if (control->whoFrom) { + sctp_free_remote_addr(control->whoFrom); + control->whoFrom = NULL; + } + sctp_free_a_readq(stcb, control); + snprintf(msg, sizeof(msg), "Reas. queue emtpy, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + tsn, strmno, strmseq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_15; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + if (last_chunk) { + *m = NULL; + } + return (0); + } else { + if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { + sctp_m_freem(control->data); + control->data = NULL; + if (control->whoFrom) { + sctp_free_remote_addr(control->whoFrom); + control->whoFrom = NULL; + } + sctp_free_a_readq(stcb, control); + snprintf(msg, sizeof(msg), "PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + tsn, strmno, strmseq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_16; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + if (last_chunk) { + *m = NULL; + } + 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; + if (control->whoFrom) { + sctp_free_remote_addr(control->whoFrom); + control->whoFrom = NULL; + } + sctp_free_a_readq(stcb, control); + snprintf(msg, sizeof(msg), "No PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", + tsn, strmno, strmseq); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_17; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_flag = 1; + if (last_chunk) { + *m = NULL; + } + 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_mark_non_revokable(asoc, control->sinfo_tsn); + sctp_add_to_readq(stcb->sctp_ep, stcb, + control, + &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); + } else { + /* + * 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) && + SCTP_TSN_GT(tsn, liste->tsn)) { + /* + * yep its past where we need to reset... go + * ahead and queue it. + */ + if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { + /* first one on */ + TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); + } else { + struct sctp_queued_to_read *ctlOn, *nctlOn; + unsigned char inserted = 0; + + TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) { + if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) { + continue; + } else { + /* found it */ + TAILQ_INSERT_BEFORE(ctlOn, control, next); + inserted = 1; + break; + } + } + if (inserted == 0) { + /* + * must be put at end, use + * prevP (all setup from + * loop) to setup nextP. + */ + TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); + } + } + } else { + sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); + if (*abort_flag) { + if (last_chunk) { + *m = NULL; + } + 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. + */ + if (last_chunk) { + *m = NULL; + } + return (0); + } + } +finish_express_del: + if (tsn == (asoc->cumulative_tsn + 1)) { + /* Update cum-ack */ + asoc->cumulative_tsn = tsn; + } + if (last_chunk) { + *m = NULL; + } + if (ordered) { + SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); + } else { + SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); + } + SCTP_STAT_INCR(sctps_recvdata); + /* Set it present please */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { + sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, + asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); + } + /* check the special flag for stream resets */ + if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && + SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) { + /* + * we have finished working through the backlogged TSN's now + * time to reset streams. 1: call reset function. 2: free + * pending_reply space 3: distribute any chunks in + * pending_reply_queue. + */ + struct sctp_queued_to_read *ctl, *nctl; + + sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams); + TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); + SCTP_FREE(liste, SCTP_M_STRESET); + /*sa_ignore FREED_MEMORY*/ + liste = TAILQ_FIRST(&asoc->resetHead); + if (TAILQ_EMPTY(&asoc->resetHead)) { + /* All can be removed */ + TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { + TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); + sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); + if (*abort_flag) { + return (0); + } + } + } else { + TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { + if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) { + break; + } + /* + * if ctl->sinfo_tsn is <= liste->tsn we can + * process it which is the NOT of + * ctl->sinfo_tsn > liste->tsn + */ + TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); + sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); + if (*abort_flag) { + return (0); + } + } + } + /* + * 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] = { + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 5, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 6, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 5, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 7, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 5, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 6, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 5, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 4, + 0, 1, 0, 2, 0, 1, 0, 3, + 0, 1, 0, 2, 0, 1, 0, 8 +}; + + +void +sctp_slide_mapping_arrays(struct sctp_tcb *stcb) +{ + /* + * Now we also need to check the mapping array in a couple of ways. + * 1) Did we move the cum-ack point? + * + * When you first glance at this you might think + * that all entries that make up the postion + * of the cum-ack would be in the nr-mapping array + * only.. i.e. things up to the cum-ack are always + * deliverable. Thats true with one exception, when + * its a fragmented message we may not deliver the data + * until some threshold (or all of it) is in place. So + * we must OR the nr_mapping_array and mapping_array to + * get a true picture of the cum-ack. + */ + struct sctp_association *asoc; + int at; + uint8_t val; + int slide_from, slide_end, lgap, distance; + uint32_t old_cumack, old_base, old_highest, highest_tsn; + + asoc = &stcb->asoc; + + old_cumack = asoc->cumulative_tsn; + old_base = asoc->mapping_array_base_tsn; + old_highest = asoc->highest_tsn_inside_map; + /* + * We could probably improve this a small bit by calculating the + * offset of the current cum-ack as the starting point. + */ + at = 0; + for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { + val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from]; + if (val == 0xff) { + at += 8; + } else { + /* there is a 0 bit */ + at += sctp_map_lookup_tab[val]; + break; + } + } + asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at-1); + + if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) && + SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) { +#ifdef INVARIANTS + panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", + asoc->cumulative_tsn, asoc->highest_tsn_inside_map); +#else + SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", + asoc->cumulative_tsn, asoc->highest_tsn_inside_map); + sctp_print_mapping_array(asoc); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); + } + asoc->highest_tsn_inside_map = asoc->cumulative_tsn; + asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; +#endif + } + if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { + highest_tsn = asoc->highest_tsn_inside_nr_map; + } else { + highest_tsn = asoc->highest_tsn_inside_map; + } + if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) { + /* The complete array was completed by a single FR */ + /* highest becomes the cum-ack */ + int clr; +#ifdef INVARIANTS + unsigned int i; +#endif + + /* clear the array */ + clr = ((at+7) >> 3); + if (clr > asoc->mapping_array_size) { + clr = asoc->mapping_array_size; + } + memset(asoc->mapping_array, 0, clr); + memset(asoc->nr_mapping_array, 0, clr); +#ifdef INVARIANTS + for (i = 0; i < asoc->mapping_array_size; i++) { + if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) { + SCTP_PRINTF("Error Mapping array's not clean at clear\n"); + sctp_print_mapping_array(asoc); + } + } +#endif + asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; + asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn; + } else if (at >= 8) { + /* we can slide the mapping array down */ + /* slide_from holds where we hit the first NON 0xff byte */ + + /* + * now calculate the ceiling of the move using our highest + * TSN value + */ + SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn); + slide_end = (lgap >> 3); + if (slide_end < slide_from) { + sctp_print_mapping_array(asoc); +#ifdef INVARIANTS + panic("impossible slide"); +#else + SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n", + lgap, slide_end, slide_from, at); + return; +#endif + } + if (slide_end > asoc->mapping_array_size) { +#ifdef INVARIANTS + panic("would overrun buffer"); +#else + SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n", + asoc->mapping_array_size, slide_end); + slide_end = asoc->mapping_array_size; +#endif + } + distance = (slide_end - slide_from) + 1; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(old_base, old_cumack, old_highest, + SCTP_MAP_PREPARE_SLIDE); + sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, + (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); + } + if (distance + slide_from > asoc->mapping_array_size || + distance < 0) { + /* + * Here we do NOT slide forward the array so that + * hopefully when more data comes in to fill it up + * we will be able to slide it forward. Really I + * don't think this should happen :-0 + */ + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map((uint32_t) distance, (uint32_t) slide_from, + (uint32_t) asoc->mapping_array_size, + SCTP_MAP_SLIDE_NONE); + } + } else { + int ii; + + for (ii = 0; ii < distance; ii++) { + asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii]; + asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii]; + + } + for (ii = distance; ii < asoc->mapping_array_size; ii++) { + asoc->mapping_array[ii] = 0; + asoc->nr_mapping_array[ii] = 0; + } + if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) { + asoc->highest_tsn_inside_map += (slide_from << 3); + } + if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) { + asoc->highest_tsn_inside_nr_map += (slide_from << 3); + } + asoc->mapping_array_base_tsn += (slide_from << 3); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(asoc->mapping_array_base_tsn, + asoc->cumulative_tsn, asoc->highest_tsn_inside_map, + SCTP_MAP_SLIDE_RESULT); + } + } + } +} + +void +sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap) +{ + struct sctp_association *asoc; + uint32_t highest_tsn; + + asoc = &stcb->asoc; + if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { + highest_tsn = asoc->highest_tsn_inside_nr_map; + } else { + highest_tsn = asoc->highest_tsn_inside_map; + } + + /* + * Now we need to see if we need to queue a sack or just start the + * timer (if allowed). + */ + if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { + /* + * Ok special case, in SHUTDOWN-SENT case. here we + * maker sure SACK timer is off and instead send a + * SHUTDOWN and a SACK + */ + if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { + sctp_timer_stop(SCTP_TIMER_TYPE_RECV, + stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA+SCTP_LOC_18); + } + sctp_send_shutdown(stcb, + ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination)); + sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); + } else { + int is_a_gap; + + /* is there a gap now ? */ + is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); + + /* + * CMT DAC algorithm: increase number of packets + * received since last ack + */ + stcb->asoc.cmt_dac_pkts_rcvd++; + + if ((stcb->asoc.send_sack == 1) || /* We need to send a SACK */ + ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no + * longer is one */ + (stcb->asoc.numduptsns) || /* we have dup's */ + (is_a_gap) || /* is still a gap */ + (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ + (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ + ) { + + if ((stcb->asoc.sctp_cmt_on_off > 0) && + (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && + (stcb->asoc.send_sack == 0) && + (stcb->asoc.numduptsns == 0) && + (stcb->asoc.delayed_ack) && + (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { + + /* + * CMT DAC algorithm: With CMT, + * delay acks even in the face of + + * reordering. Therefore, if acks + * that do not have to be sent + * because of the above reasons, + * will be delayed. That is, acks + * that would have been sent due to + * gap reports will be delayed with + * DAC. Start the delayed ack timer. + */ + sctp_timer_start(SCTP_TIMER_TYPE_RECV, + stcb->sctp_ep, stcb, NULL); + } else { + /* + * Ok we must build a SACK since the + * timer is pending, we got our + * first packet OR there are gaps or + * duplicates. + */ + (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); + sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); + } + } else { + if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { + sctp_timer_start(SCTP_TIMER_TYPE_RECV, + stcb->sctp_ep, stcb, NULL); + } + } + } +} + +void +sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) +{ + struct sctp_tmit_chunk *chk; + uint32_t tsize, pd_point; + 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 the socket buffer max or nothing on the + * delivery queue and something can be delivered. + */ + if (stcb->sctp_socket) { + pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, + stcb->sctp_ep->partial_delivery_point); + } else { + pd_point = stcb->sctp_ep->partial_delivery_point; + } + if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_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 sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_inpcb *inp, + struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t *high_tsn, +#if defined(__FreeBSD__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id, uint16_t port) +{ + 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; + struct mbuf *m; + uint32_t highest_tsn; + + /* set the rwnd */ + sctp_set_rwnd(stcb, &stcb->asoc); + + m = *mm; + SCTP_TCB_LOCK_ASSERT(stcb); + asoc = &stcb->asoc; + if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { + highest_tsn = asoc->highest_tsn_inside_nr_map; + } else { + highest_tsn = asoc->highest_tsn_inside_map; + } + was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); + /* + * setup where we got the last DATA packet from for any SACK that + * may need to go out. Don't bump the net. This is done ONLY when a + * chunk is assigned. + */ + asoc->last_data_chunk_from = net; + +#ifndef __Panda__ + /*- + * Now before we proceed we must figure out if this is a wasted + * cluster... i.e. it is a small packet sent in and yet the driver + * underneath allocated a full cluster for it. If so we must copy it + * to a smaller mbuf and free up the cluster mbuf. This will help + * with cluster starvation. Note for __Panda__ we don't do this + * since it has clusters all the way down to 64 bytes. + */ + if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { + /* we only handle mbufs that are singletons.. not chains */ + m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA); + if (m) { + /* ok lets see if we can copy the data up */ + caddr_t *from, *to; + /* get the pointers and copy */ + to = mtod(m, caddr_t *); + from = mtod((*mm), caddr_t *); + memcpy(to, from, SCTP_BUF_LEN((*mm))); + /* copy the length and free up the old */ + SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); + sctp_m_freem(*mm); + /* sucess, back copy */ + *mm = m; + } else { + /* We are in trouble in the mbuf world .. yikes */ + m = *mm; + } + } +#endif + /* 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; + continue; + } + if (ch->ch.chunk_type == SCTP_DATA) { + if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) { + /* + * Need to send an abort since we had a + * invalid data chunk. + */ + struct mbuf *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + + snprintf(msg, sizeof(msg), "DATA chunk of length %d", + chk_length); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_19; + sctp_abort_association(inp, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) + mflowtype, mflowid, +#endif + vrf_id, port); + return (2); + } + if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) { + /* + * Need to send an abort since we had an + * empty data chunk. + */ + struct mbuf *op_err; + + op_err = sctp_generate_no_user_data_cause(ch->dp.tsn); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_19; + sctp_abort_association(inp, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) + mflowtype, mflowid, +#endif + vrf_id, port); + 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; + continue; + } + } 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_NR_SELECTIVE_ACK: + case SCTP_HEARTBEAT_REQUEST: + case SCTP_HEARTBEAT_ACK: + case SCTP_ABORT_ASSOCIATION: + case SCTP_SHUTDOWN: + case SCTP_SHUTDOWN_ACK: + case SCTP_OPERATION_ERROR: + case SCTP_COOKIE_ECHO: + case SCTP_COOKIE_ACK: + case SCTP_ECN_ECHO: + case SCTP_ECN_CWR: + case SCTP_SHUTDOWN_COMPLETE: + case SCTP_AUTHENTICATION: + case SCTP_ASCONF_ACK: + case SCTP_PACKET_DROPPED: + case SCTP_STREAM_RESET: + case SCTP_FORWARD_CUM_TSN: + case SCTP_ASCONF: + /* + * Now, what do we do with KNOWN chunks that + * are NOT in the right place? + * + * For now, I do nothing but ignore them. We + * may later want to add sysctl stuff to + * switch out and do either an ABORT() or + * possibly process them. + */ + if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { + struct mbuf *op_err; + + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, ""); + sctp_abort_association(inp, stcb, + m, iphlen, + src, dst, + sh, op_err, +#if defined(__FreeBSD__) + mflowtype, mflowid, +#endif + vrf_id, port); + 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_NOWAIT, 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, chk_length, M_NOWAIT); + if (SCTP_BUF_NEXT(merr)) { + if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) { + sctp_m_freem(merr); + } else { + 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; + continue; + } + } + if (break_flag) { + /* + * we need to report rwnd overrun drops. + */ + sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0); + } + if (num_chunks) { + /* + * Did we get data, if so update the time for auto-close and + * give peer credit for being alive. + */ + SCTP_STAT_INCR(sctps_recvpktwithdata); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INDATA, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); + } + /* now service all of the reassm queue if needed */ + if (!(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 */ + sctp_sack_check(stcb, was_a_gap); + return (0); +} + +static int +sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn, + uint16_t frag_strt, uint16_t frag_end, int nr_sacking, + int *num_frs, + uint32_t *biggest_newly_acked_tsn, + uint32_t *this_sack_lowest_newack, + int *rto_ok) +{ + struct sctp_tmit_chunk *tp1; + unsigned int theTSN; + int j, wake_him = 0, circled = 0; + + /* Recover the tp1 we last saw */ + tp1 = *p_tp1; + if (tp1 == NULL) { + tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); + } + for (j = frag_strt; j <= frag_end; j++) { + theTSN = j + last_tsn; + while (tp1) { + if (tp1->rec.data.doing_fast_retransmit) + (*num_frs) += 1; + + /*- + * CMT: CUCv2 algorithm. For each TSN being + * processed from the sent queue, track the + * next expected pseudo-cumack, or + * rtx_pseudo_cumack, if required. Separate + * cumack trackers for first transmissions, + * and retransmissions. + */ + if ((tp1->sent < SCTP_DATAGRAM_RESEND) && + (tp1->whoTo->find_pseudo_cumack == 1) && + (tp1->snd_count == 1)) { + tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; + tp1->whoTo->find_pseudo_cumack = 0; + } + if ((tp1->sent < SCTP_DATAGRAM_RESEND) && + (tp1->whoTo->find_rtx_pseudo_cumack == 1) && + (tp1->snd_count > 1)) { + tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; + tp1->whoTo->find_rtx_pseudo_cumack = 0; + } + if (tp1->rec.data.TSN_seq == theTSN) { + if (tp1->sent != SCTP_DATAGRAM_UNSENT) { + /*- + * must be held until + * cum-ack passes + */ + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + /*- + * If it is less than RESEND, it is + * now no-longer in flight. + * Higher values may already be set + * via previous Gap Ack Blocks... + * i.e. ACKED or RESEND. + */ + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, + *biggest_newly_acked_tsn)) { + *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; + } + /*- + * CMT: SFR algo (and HTNA) - set + * saw_newack to 1 for dest being + * newly acked. update + * this_sack_highest_newack if + * appropriate. + */ + if (tp1->rec.data.chunk_was_revoked == 0) + tp1->whoTo->saw_newack = 1; + + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, + tp1->whoTo->this_sack_highest_newack)) { + tp1->whoTo->this_sack_highest_newack = + tp1->rec.data.TSN_seq; + } + /*- + * CMT DAC algo: also update + * this_sack_lowest_newack + */ + if (*this_sack_lowest_newack == 0) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(*this_sack_lowest_newack, + last_tsn, + tp1->rec.data.TSN_seq, + 0, + 0, + SCTP_LOG_TSN_ACKED); + } + *this_sack_lowest_newack = tp1->rec.data.TSN_seq; + } + /*- + * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp + * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set + * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be + * updated. Also trigger search for the next expected (rtx-)pseudo-cumack. + * Separate pseudo_cumack trackers for first transmissions and + * retransmissions. + */ + if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { + if (tp1->rec.data.chunk_was_revoked == 0) { + tp1->whoTo->new_pseudo_cumack = 1; + } + tp1->whoTo->find_pseudo_cumack = 1; + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); + } + if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { + if (tp1->rec.data.chunk_was_revoked == 0) { + tp1->whoTo->new_pseudo_cumack = 1; + } + tp1->whoTo->find_rtx_pseudo_cumack = 1; + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(*biggest_newly_acked_tsn, + last_tsn, + tp1->rec.data.TSN_seq, + frag_strt, + frag_end, + SCTP_LOG_TSN_ACKED); + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, + tp1->whoTo->flight_size, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } + sctp_flight_size_decrease(tp1); + if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { + (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo, + tp1); + } + sctp_total_flight_decrease(stcb, tp1); + + tp1->whoTo->net_ack += tp1->send_size; + if (tp1->snd_count < 2) { + /*- + * True non-retransmited chunk + */ + tp1->whoTo->net_ack2 += tp1->send_size; + + /*- + * update RTO too ? + */ + if (tp1->do_rtt) { + if (*rto_ok) { + tp1->whoTo->RTO = + sctp_calculate_rto(stcb, + &stcb->asoc, + tp1->whoTo, + &tp1->sent_rcv_time, + sctp_align_safe_nocopy, + SCTP_RTT_FROM_DATA); + *rto_ok = 0; + } + if (tp1->whoTo->rto_needed == 0) { + tp1->whoTo->rto_needed = 1; + } + tp1->do_rtt = 0; + } + } + + } + if (tp1->sent <= SCTP_DATAGRAM_RESEND) { + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, + stcb->asoc.this_sack_highest_gap)) { + stcb->asoc.this_sack_highest_gap = + tp1->rec.data.TSN_seq; + } + if (tp1->sent == SCTP_DATAGRAM_RESEND) { + sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt); +#ifdef SCTP_AUDITING_ENABLED + sctp_audit_log(0xB2, + (stcb->asoc.sent_queue_retran_cnt & 0x000000ff)); +#endif + } + } + /*- + * All chunks NOT UNSENT fall through here and are marked + * (leave PR-SCTP ones that are to skip alone though) + */ + if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) && + (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { + tp1->sent = SCTP_DATAGRAM_MARKED; + } + if (tp1->rec.data.chunk_was_revoked) { + /* deflate the cwnd */ + tp1->whoTo->cwnd -= tp1->book_size; + tp1->rec.data.chunk_was_revoked = 0; + } + /* NR Sack code here */ + if (nr_sacking && + (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { + if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { + stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--; +#ifdef INVARIANTS + } else { + panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); +#endif + } + tp1->sent = SCTP_DATAGRAM_NR_ACKED; + if (tp1->data) { + /* sa_ignore NO_NULL_CHK */ + sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1); + sctp_m_freem(tp1->data); + tp1->data = NULL; + } + wake_him++; + } + } + break; + } /* if (tp1->TSN_seq == theTSN) */ + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) { + break; + } + tp1 = TAILQ_NEXT(tp1, sctp_next); + if ((tp1 == NULL) && (circled == 0)) { + circled++; + tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); + } + } /* end while (tp1) */ + if (tp1 == NULL) { + circled = 0; + tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); + } + /* In case the fragments were not in order we must reset */ + } /* end for (j = fragStart */ + *p_tp1 = tp1; + return (wake_him); /* Return value only used for nr-sack */ +} + + +static int +sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, + uint32_t last_tsn, uint32_t *biggest_tsn_acked, + uint32_t *biggest_newly_acked_tsn, uint32_t *this_sack_lowest_newack, + int num_seg, int num_nr_seg, int *rto_ok) +{ + struct sctp_gap_ack_block *frag, block; + struct sctp_tmit_chunk *tp1; + int i; + int num_frs = 0; + int chunk_freed; + int non_revocable; + uint16_t frag_strt, frag_end, prev_frag_end; + + tp1 = TAILQ_FIRST(&asoc->sent_queue); + prev_frag_end = 0; + chunk_freed = 0; + + for (i = 0; i < (num_seg + num_nr_seg); i++) { + if (i == num_seg) { + prev_frag_end = 0; + tp1 = TAILQ_FIRST(&asoc->sent_queue); + } + frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, + sizeof(struct sctp_gap_ack_block), (uint8_t *) &block); + *offset += sizeof(block); + if (frag == NULL) { + return (chunk_freed); + } + frag_strt = ntohs(frag->start); + frag_end = ntohs(frag->end); + + if (frag_strt > frag_end) { + /* This gap report is malformed, skip it. */ + continue; + } + if (frag_strt <= prev_frag_end) { + /* This gap report is not in order, so restart. */ + tp1 = TAILQ_FIRST(&asoc->sent_queue); + } + if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) { + *biggest_tsn_acked = last_tsn + frag_end; + } + if (i < num_seg) { + non_revocable = 0; + } else { + non_revocable = 1; + } + if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end, + non_revocable, &num_frs, biggest_newly_acked_tsn, + this_sack_lowest_newack, rto_ok)) { + chunk_freed = 1; + } + prev_frag_end = frag_end; + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + if (num_frs) + sctp_log_fr(*biggest_tsn_acked, + *biggest_newly_acked_tsn, + last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); + } + return (chunk_freed); +} + +static void +sctp_check_for_revoked(struct sctp_tcb *stcb, + struct sctp_association *asoc, uint32_t cumack, + uint32_t biggest_tsn_acked) +{ + struct sctp_tmit_chunk *tp1; + + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) { + /* + * ok this guy is either ACK or MARKED. If it is + * ACKED it has been previously acked but not this + * time i.e. revoked. If it is MARKED it was ACK'ed + * again. + */ + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) { + break; + } + if (tp1->sent == SCTP_DATAGRAM_ACKED) { + /* it has been revoked */ + tp1->sent = SCTP_DATAGRAM_SENT; + tp1->rec.data.chunk_was_revoked = 1; + /* We must add this stuff back in to + * assure timers and such get started. + */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, + tp1->whoTo->flight_size, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } + sctp_flight_size_increase(tp1); + sctp_total_flight_increase(stcb, tp1); + /* We inflate the cwnd to compensate for our + * artificial inflation of the flight_size. + */ + tp1->whoTo->cwnd += tp1->book_size; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(asoc->last_acked_seq, + cumack, + tp1->rec.data.TSN_seq, + 0, + 0, + SCTP_LOG_TSN_REVOKED); + } + } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { + /* it has been re-acked in this SACK */ + tp1->sent = SCTP_DATAGRAM_ACKED; + } + } + if (tp1->sent == SCTP_DATAGRAM_UNSENT) + break; + } +} + + +static void +sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, + uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved) +{ + struct sctp_tmit_chunk *tp1; + int strike_flag = 0; + struct timeval now; + int tot_retrans = 0; + uint32_t sending_seq; + struct sctp_nets *net; + int num_dests_sacked = 0; + + /* + * select the sending_seq, this is either the next thing ready to be + * sent but not transmitted, OR, the next seq we assign. + */ + tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); + if (tp1 == NULL) { + sending_seq = asoc->sending_seq; + } else { + sending_seq = tp1->rec.data.TSN_seq; + } + + /* CMT DAC algo: finding out if SACK is a mixed SACK */ + if ((asoc->sctp_cmt_on_off > 0) && + SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (net->saw_newack) + num_dests_sacked++; + } + } + if (stcb->asoc.prsctp_supported) { + (void)SCTP_GETTIME_TIMEVAL(&now); + } + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + strike_flag = 0; + if (tp1->no_fr_allowed) { + /* this one had a timeout or something */ + continue; + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + if (tp1->sent < SCTP_DATAGRAM_RESEND) + sctp_log_fr(biggest_tsn_newly_acked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_CHECK_STRIKE); + } + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) || + tp1->sent == SCTP_DATAGRAM_UNSENT) { + /* done */ + break; + } + if (stcb->asoc.prsctp_supported) { + if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { + /* Is it expired? */ +#ifndef __FreeBSD__ + if (timercmp(&now, &tp1->rec.data.timetodrop, >)) { +#else + if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { +#endif + /* Yes so drop it */ + if (tp1->data != NULL) { + (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, + SCTP_SO_NOT_LOCKED); + } + continue; + } + } + + } + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) { + /* we are beyond the tsn in the sack */ + break; + } + if (tp1->sent >= SCTP_DATAGRAM_RESEND) { + /* either a RESEND, ACKED, or MARKED */ + /* skip */ + if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { + /* Continue strikin FWD-TSN chunks */ + tp1->rec.data.fwd_tsn_cnt++; + } + continue; + } + /* + * CMT : SFR algo (covers part of DAC and HTNA as well) + */ + if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { + /* + * No new acks were receieved for data sent to this + * dest. Therefore, according to the SFR algo for + * CMT, no data sent to this dest can be marked for + * FR using this SACK. + */ + continue; + } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq, + tp1->whoTo->this_sack_highest_newack)) { + /* + * CMT: New acks were receieved for data sent to + * this dest. But no new acks were seen for data + * sent after tp1. Therefore, according to the SFR + * algo for CMT, tp1 cannot be marked for FR using + * this SACK. This step covers part of the DAC algo + * and the HTNA algo as well. + */ + continue; + } + /* + * Here we check to see if we were have already done a FR + * and if so we see if the biggest TSN we saw in the sack is + * smaller than the recovery point. If so we don't strike + * the tsn... otherwise we CAN strike the TSN. + */ + /* + * @@@ JRI: Check for CMT + * if (accum_moved && asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 0)) { + */ + if (accum_moved && asoc->fast_retran_loss_recovery) { + /* + * Strike the TSN if in fast-recovery and cum-ack + * moved. + */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(biggest_tsn_newly_acked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_STRIKE_CHUNK); + } + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + tp1->sent++; + } + if ((asoc->sctp_cmt_on_off > 0) && + SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { + /* + * CMT DAC algorithm: If SACK flag is set to + * 0, then lowest_newack test will not pass + * because it would have been set to the + * cumack earlier. If not already to be + * rtx'd, If not a mixed sack and if tp1 is + * not between two sacked TSNs, then mark by + * one more. + * NOTE that we are marking by one additional time since the SACK DAC flag indicates that + * two packets have been received after this missing TSN. + */ + if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && + SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(16 + num_dests_sacked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_STRIKE_CHUNK); + } + tp1->sent++; + } + } + } else if ((tp1->rec.data.doing_fast_retransmit) && + (asoc->sctp_cmt_on_off == 0)) { + /* + * For those that have done a FR we must take + * special consideration if we strike. I.e the + * biggest_newly_acked must be higher than the + * sending_seq at the time we did the FR. + */ + if ( +#ifdef SCTP_FR_TO_ALTERNATE + /* + * If FR's go to new networks, then we must only do + * this for singly homed asoc's. However if the FR's + * go to the same network (Armando's work) then its + * ok to FR multiple times. + */ + (asoc->numnets < 2) +#else + (1) +#endif + ) { + + if (SCTP_TSN_GE(biggest_tsn_newly_acked, + tp1->rec.data.fast_retran_tsn)) { + /* + * Strike the TSN, since this ack is + * beyond where things were when we + * did a FR. + */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(biggest_tsn_newly_acked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_STRIKE_CHUNK); + } + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + tp1->sent++; + } + strike_flag = 1; + if ((asoc->sctp_cmt_on_off > 0) && + SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { + /* + * CMT DAC algorithm: If + * SACK flag is set to 0, + * then lowest_newack test + * will not pass because it + * would have been set to + * the cumack earlier. If + * not already to be rtx'd, + * If not a mixed sack and + * if tp1 is not between two + * sacked TSNs, then mark by + * one more. + * NOTE that we are marking by one additional time since the SACK DAC flag indicates that + * two packets have been received after this missing TSN. + */ + if ((tp1->sent < SCTP_DATAGRAM_RESEND) && + (num_dests_sacked == 1) && + SCTP_TSN_GT(this_sack_lowest_newack, + tp1->rec.data.TSN_seq)) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(32 + num_dests_sacked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_STRIKE_CHUNK); + } + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + tp1->sent++; + } + } + } + } + } + /* + * JRI: TODO: remove code for HTNA algo. CMT's + * SFR algo covers HTNA. + */ + } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, + biggest_tsn_newly_acked)) { + /* + * We don't strike these: This is the HTNA + * algorithm i.e. we don't strike If our TSN is + * larger than the Highest TSN Newly Acked. + */ + ; + } else { + /* Strike the TSN */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(biggest_tsn_newly_acked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_STRIKE_CHUNK); + } + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + tp1->sent++; + } + if ((asoc->sctp_cmt_on_off > 0) && + SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { + /* + * CMT DAC algorithm: If SACK flag is set to + * 0, then lowest_newack test will not pass + * because it would have been set to the + * cumack earlier. If not already to be + * rtx'd, If not a mixed sack and if tp1 is + * not between two sacked TSNs, then mark by + * one more. + * NOTE that we are marking by one additional time since the SACK DAC flag indicates that + * two packets have been received after this missing TSN. + */ + if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && + SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(48 + num_dests_sacked, + tp1->rec.data.TSN_seq, + tp1->sent, + SCTP_FR_LOG_STRIKE_CHUNK); + } + tp1->sent++; + } + } + } + if (tp1->sent == SCTP_DATAGRAM_RESEND) { + struct sctp_nets *alt; + + /* fix counts and things */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, + (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } + if (tp1->whoTo) { + tp1->whoTo->net_ack++; + sctp_flight_size_decrease(tp1); + if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { + (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo, + tp1); + } + } + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { + sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, + asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); + } + /* add back to the rwnd */ + asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); + + /* remove from the total flight */ + sctp_total_flight_decrease(stcb, tp1); + + if ((stcb->asoc.prsctp_supported) && + (PR_SCTP_RTX_ENABLED(tp1->flags))) { + /* Has it been retransmitted tv_sec times? - we store the retran count there. */ + if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { + /* Yes, so drop it */ + if (tp1->data != NULL) { + (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, + SCTP_SO_NOT_LOCKED); + } + /* Make sure to flag we had a FR */ + tp1->whoTo->net_ack++; + continue; + } + } + /* SCTP_PRINTF("OK, we are now ready to FR this guy\n"); */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { + sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, + 0, SCTP_FR_MARKED); + } + if (strike_flag) { + /* This is a subsequent FR */ + SCTP_STAT_INCR(sctps_sendmultfastretrans); + } + sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); + if (asoc->sctp_cmt_on_off > 0) { + /* + * CMT: Using RTX_SSTHRESH policy for CMT. + * If CMT is being used, then pick dest with + * largest ssthresh for any retransmission. + */ + tp1->no_fr_allowed = 1; + alt = tp1->whoTo; + /*sa_ignore NO_NULL_CHK*/ + if (asoc->sctp_cmt_pf > 0) { + /* JRS 5/18/07 - If CMT PF is on, use the PF version of find_alt_net() */ + alt = sctp_find_alternate_net(stcb, alt, 2); + } else { + /* JRS 5/18/07 - If only CMT is on, use the CMT version of find_alt_net() */ + /*sa_ignore NO_NULL_CHK*/ + alt = sctp_find_alternate_net(stcb, alt, 1); + } + if (alt == NULL) { + alt = tp1->whoTo; + } + /* + * CUCv2: If a different dest is picked for + * the retransmission, then new + * (rtx-)pseudo_cumack needs to be tracked + * for orig dest. Let CUCv2 track new (rtx-) + * pseudo-cumack always. + */ + if (tp1->whoTo) { + tp1->whoTo->find_pseudo_cumack = 1; + tp1->whoTo->find_rtx_pseudo_cumack = 1; + } + + } else {/* CMT is OFF */ + +#ifdef SCTP_FR_TO_ALTERNATE + /* Can we find an alternate? */ + alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); +#else + /* + * default behavior is to NOT retransmit + * FR's to an alternate. Armando Caro's + * paper details why. + */ + alt = tp1->whoTo; +#endif + } + + tp1->rec.data.doing_fast_retransmit = 1; + tot_retrans++; + /* mark the sending seq for possible subsequent FR's */ + /* + * SCTP_PRINTF("Marking TSN for FR new value %x\n", + * (uint32_t)tpi->rec.data.TSN_seq); + */ + if (TAILQ_EMPTY(&asoc->send_queue)) { + /* + * If the queue of send is empty then its + * the next sequence number that will be + * assigned so we subtract one from this to + * get the one we last sent. + */ + tp1->rec.data.fast_retran_tsn = sending_seq; + } else { + /* + * If there are chunks on the send queue + * (unsent data that has made it from the + * stream queues but not out the door, we + * take the first one (which will have the + * lowest TSN) and subtract one to get the + * one we last sent. + */ + struct sctp_tmit_chunk *ttt; + + ttt = TAILQ_FIRST(&asoc->send_queue); + tp1->rec.data.fast_retran_tsn = + ttt->rec.data.TSN_seq; + } + + if (tp1->do_rtt) { + /* + * this guy had a RTO calculation pending on + * it, cancel it + */ + if ((tp1->whoTo != NULL) && + (tp1->whoTo->rto_needed == 0)) { + tp1->whoTo->rto_needed = 1; + } + tp1->do_rtt = 0; + } + if (alt != tp1->whoTo) { + /* yes, there is an alternate. */ + sctp_free_remote_addr(tp1->whoTo); + /*sa_ignore FREED_MEMORY*/ + tp1->whoTo = alt; + atomic_add_int(&alt->ref_count, 1); + } + } + } +} + +struct sctp_tmit_chunk * +sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, + struct sctp_association *asoc) +{ + struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; + struct timeval now; + int now_filled = 0; + + if (asoc->prsctp_supported == 0) { + return (NULL); + } + TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { + if (tp1->sent != SCTP_FORWARD_TSN_SKIP && + tp1->sent != SCTP_DATAGRAM_RESEND && + tp1->sent != SCTP_DATAGRAM_NR_ACKED) { + /* no chance to advance, out of here */ + break; + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { + if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || + (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { + sctp_misc_ints(SCTP_FWD_TSN_CHECK, + asoc->advanced_peer_ack_point, + tp1->rec.data.TSN_seq, 0, 0); + } + } + if (!PR_SCTP_ENABLED(tp1->flags)) { + /* + * We can't fwd-tsn past any that are reliable aka + * retransmitted until the asoc fails. + */ + break; + } + if (!now_filled) { + (void)SCTP_GETTIME_TIMEVAL(&now); + now_filled = 1; + } + /* + * now we got a chunk which is marked for another + * retransmission to a PR-stream but has run out its chances + * already maybe OR has been marked to skip now. Can we skip + * it if its a resend? + */ + if (tp1->sent == SCTP_DATAGRAM_RESEND && + (PR_SCTP_TTL_ENABLED(tp1->flags))) { + /* + * Now is this one marked for resend and its time is + * now up? + */ +#ifndef __FreeBSD__ + if (timercmp(&now, &tp1->rec.data.timetodrop, >)) { +#else + if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { +#endif + /* Yes so drop it */ + if (tp1->data) { + (void)sctp_release_pr_sctp_chunk(stcb, tp1, + 1, SCTP_SO_NOT_LOCKED); + } + } else { + /* + * No, we are done when hit one for resend + * whos time as not expired. + */ + break; + } + } + /* + * Ok now if this chunk is marked to drop it we can clean up + * the chunk, advance our peer ack point and we can check + * the next chunk. + */ + if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || + (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { + /* advance PeerAckPoint goes forward */ + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) { + asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; + a_adv = tp1; + } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) { + /* No update but we do save the chk */ + a_adv = tp1; + } + } else { + /* + * If it is still in RESEND we can advance no + * further + */ + break; + } + } + return (a_adv); +} + +static int +sctp_fs_audit(struct sctp_association *asoc) +{ + struct sctp_tmit_chunk *chk; + int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; + int entry_flight, entry_cnt, ret; + + entry_flight = asoc->total_flight; + entry_cnt = asoc->total_flight_count; + ret = 0; + + if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) + return (0); + + TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { + if (chk->sent < SCTP_DATAGRAM_RESEND) { + SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n", + chk->rec.data.TSN_seq, + chk->send_size, + chk->snd_count); + inflight++; + } else if (chk->sent == SCTP_DATAGRAM_RESEND) { + resend++; + } else if (chk->sent < SCTP_DATAGRAM_ACKED) { + inbetween++; + } else if (chk->sent > SCTP_DATAGRAM_ACKED) { + above++; + } else { + acked++; + } + } + + if ((inflight > 0) || (inbetween > 0)) { +#ifdef INVARIANTS + panic("Flight size-express incorrect? \n"); +#else + SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n", + entry_flight, entry_cnt); + + SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n", + inflight, inbetween, resend, above, acked); + ret = 1; +#endif + } + return (ret); +} + + +static void +sctp_window_probe_recovery(struct sctp_tcb *stcb, + struct sctp_association *asoc, + struct sctp_tmit_chunk *tp1) +{ + tp1->window_probe = 0; + if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { + /* TSN's skipped we do NOT move back. */ + sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, + tp1->whoTo ? tp1->whoTo->flight_size : 0, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + return; + } + /* First setup this by shrinking flight */ + if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { + (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo, + tp1); + } + sctp_flight_size_decrease(tp1); + sctp_total_flight_decrease(stcb, tp1); + /* Now mark for resend */ + tp1->sent = SCTP_DATAGRAM_RESEND; + sctp_ucount_incr(asoc->sent_queue_retran_cnt); + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, + tp1->whoTo->flight_size, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } +} + +void +sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, + uint32_t rwnd, int *abort_now, int ecne_seen) +{ + struct sctp_nets *net; + struct sctp_association *asoc; + struct sctp_tmit_chunk *tp1, *tp2; + uint32_t old_rwnd; + int win_probe_recovery = 0; + int win_probe_recovered = 0; + int j, done_once = 0; + int rto_ok = 1; + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { + sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, + rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); + } + SCTP_TCB_LOCK_ASSERT(stcb); +#ifdef SCTP_ASOCLOG_OF_TSNS + stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; + stcb->asoc.cumack_log_at++; + if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { + stcb->asoc.cumack_log_at = 0; + } +#endif + asoc = &stcb->asoc; + old_rwnd = asoc->peers_rwnd; + if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) { + /* old ack */ + return; + } else if (asoc->last_acked_seq == cumack) { + /* Window update sack */ + asoc->peers_rwnd = sctp_sbspace_sub(rwnd, + (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); + if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { + /* SWS sender side engages */ + asoc->peers_rwnd = 0; + } + if (asoc->peers_rwnd > old_rwnd) { + goto again; + } + return; + } + + /* First setup for CC stuff */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) { + /* Drag along the window_tsn for cwr's */ + net->cwr_window_tsn = cumack; + } + net->prev_cwnd = net->cwnd; + net->net_ack = 0; + net->net_ack2 = 0; + + /* + * CMT: Reset CUC and Fast recovery algo variables before + * SACK processing + */ + net->new_pseudo_cumack = 0; + net->will_exit_fast_recovery = 0; + if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { + (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack)(stcb, net); + } + } + if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { + uint32_t send_s; + + if (!TAILQ_EMPTY(&asoc->sent_queue)) { + tp1 = TAILQ_LAST(&asoc->sent_queue, + sctpchunk_listhead); + send_s = tp1->rec.data.TSN_seq + 1; + } else { + send_s = asoc->sending_seq; + } + if (SCTP_TSN_GE(cumack, send_s)) { +#ifndef INVARIANTS + struct mbuf *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + +#endif +#ifdef INVARIANTS + panic("Impossible sack 1"); +#else + + *abort_now = 1; + /* XXX */ + snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x", + cumack, send_s); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + return; +#endif + } + } + asoc->this_sack_highest_gap = cumack; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INDATA, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) { + /* process the new consecutive TSN first */ + TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { + if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) { + if (tp1->sent == SCTP_DATAGRAM_UNSENT) { + SCTP_PRINTF("Warning, an unsent is now acked?\n"); + } + if (tp1->sent < SCTP_DATAGRAM_ACKED) { + /* + * If it is less than ACKED, it is + * now no-longer in flight. Higher + * values may occur during marking + */ + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, + tp1->whoTo->flight_size, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } + sctp_flight_size_decrease(tp1); + if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { + (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo, + tp1); + } + /* sa_ignore NO_NULL_CHK */ + sctp_total_flight_decrease(stcb, tp1); + } + tp1->whoTo->net_ack += tp1->send_size; + if (tp1->snd_count < 2) { + /* + * True non-retransmited + * chunk + */ + tp1->whoTo->net_ack2 += + tp1->send_size; + + /* update RTO too? */ + if (tp1->do_rtt) { + if (rto_ok) { + tp1->whoTo->RTO = + /* + * sa_ignore + * NO_NULL_CHK + */ + sctp_calculate_rto(stcb, + asoc, tp1->whoTo, + &tp1->sent_rcv_time, + sctp_align_safe_nocopy, + SCTP_RTT_FROM_DATA); + rto_ok = 0; + } + if (tp1->whoTo->rto_needed == 0) { + tp1->whoTo->rto_needed = 1; + } + tp1->do_rtt = 0; + } + } + /* + * CMT: CUCv2 algorithm. From the + * cumack'd TSNs, for each TSN being + * acked for the first time, set the + * following variables for the + * corresp destination. + * new_pseudo_cumack will trigger a + * cwnd update. + * find_(rtx_)pseudo_cumack will + * trigger search for the next + * expected (rtx-)pseudo-cumack. + */ + tp1->whoTo->new_pseudo_cumack = 1; + tp1->whoTo->find_pseudo_cumack = 1; + tp1->whoTo->find_rtx_pseudo_cumack = 1; + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + /* sa_ignore NO_NULL_CHK */ + sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); + } + } + if (tp1->sent == SCTP_DATAGRAM_RESEND) { + sctp_ucount_decr(asoc->sent_queue_retran_cnt); + } + if (tp1->rec.data.chunk_was_revoked) { + /* deflate the cwnd */ + tp1->whoTo->cwnd -= tp1->book_size; + tp1->rec.data.chunk_was_revoked = 0; + } + if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { + if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { + asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; +#ifdef INVARIANTS + } else { + panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); +#endif + } + } + TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); + if (tp1->data) { + /* sa_ignore NO_NULL_CHK */ + sctp_free_bufspace(stcb, asoc, tp1, 1); + sctp_m_freem(tp1->data); + tp1->data = NULL; + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(asoc->last_acked_seq, + cumack, + tp1->rec.data.TSN_seq, + 0, + 0, + SCTP_LOG_FREE_SENT); + } + asoc->sent_queue_cnt--; + sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); + } else { + break; + } + } + + } +#if defined(__Userspace__) + if (stcb->sctp_ep->recv_callback) { + if (stcb->sctp_socket) { + uint32_t inqueue_bytes, sb_free_now; + struct sctp_inpcb *inp; + + inp = stcb->sctp_ep; + inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk)); + sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv); + + /* check if the amount free in the send socket buffer crossed the threshold */ + if (inp->send_callback && + (((inp->send_sb_threshold > 0) && + (sb_free_now >= inp->send_sb_threshold) && + (stcb->asoc.chunks_on_out_queue <= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) || + (inp->send_sb_threshold == 0))) { + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + inp->send_callback(stcb->sctp_socket, sb_free_now); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + } + } + } else if (stcb->sctp_socket) { +#else + /* sa_ignore NO_NULL_CHK */ + if (stcb->sctp_socket) { +#endif +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + struct socket *so; + +#endif + SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { + /* sa_ignore NO_NULL_CHK */ + sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK); + } +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + /* assoc was freed while we were unlocked */ + SCTP_SOCKET_UNLOCK(so, 1); + return; + } +#endif + sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { + sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK); + } + } + + /* JRS - Use the congestion control given in the CC module */ + if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (net->net_ack2 > 0) { + /* + * Karn's rule applies to clearing error count, this + * is optional. + */ + net->error_count = 0; + if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { + /* addr came good */ + net->dest_state |= SCTP_ADDR_REACHABLE; + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, + 0, (void *)net, SCTP_SO_NOT_LOCKED); + } + if (net == stcb->asoc.primary_destination) { + if (stcb->asoc.alternate) { + /* release the alternate, primary is good */ + sctp_free_remote_addr(stcb->asoc.alternate); + stcb->asoc.alternate = NULL; + } + } + if (net->dest_state & SCTP_ADDR_PF) { + net->dest_state &= ~SCTP_ADDR_PF; + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); + sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); + asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); + /* Done with this net */ + net->net_ack = 0; + } + /* restore any doubled timers */ + net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; + if (net->RTO < stcb->asoc.minrto) { + net->RTO = stcb->asoc.minrto; + } + if (net->RTO > stcb->asoc.maxrto) { + net->RTO = stcb->asoc.maxrto; + } + } + } + asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); + } + asoc->last_acked_seq = cumack; + + if (TAILQ_EMPTY(&asoc->sent_queue)) { + /* nothing left in-flight */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + net->flight_size = 0; + net->partial_bytes_acked = 0; + } + asoc->total_flight = 0; + asoc->total_flight_count = 0; + } + + /* RWND update */ + asoc->peers_rwnd = sctp_sbspace_sub(rwnd, + (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); + if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { + /* SWS sender side engages */ + asoc->peers_rwnd = 0; + } + if (asoc->peers_rwnd > old_rwnd) { + win_probe_recovery = 1; + } + /* Now assure a timer where data is queued at */ +again: + j = 0; + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + int to_ticks; + if (win_probe_recovery && (net->window_probe)) { + win_probe_recovered = 1; + /* + * Find first chunk that was used with window probe + * and clear the sent + */ + /* sa_ignore FREED_MEMORY */ + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (tp1->window_probe) { + /* move back to data send queue */ + sctp_window_probe_recovery(stcb, asoc, tp1); + break; + } + } + } + if (net->RTO == 0) { + to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); + } else { + to_ticks = MSEC_TO_TICKS(net->RTO); + } + if (net->flight_size) { + j++; + (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, + sctp_timeout_handler, &net->rxt_timer); + if (net->window_probe) { + net->window_probe = 0; + } + } else { + if (net->window_probe) { + /* In window probes we must assure a timer is still running there */ + net->window_probe = 0; + if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { + SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, + sctp_timeout_handler, &net->rxt_timer); + } + } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, net, + SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); + } + } + } + if ((j == 0) && + (!TAILQ_EMPTY(&asoc->sent_queue)) && + (asoc->sent_queue_retran_cnt == 0) && + (win_probe_recovered == 0) && + (done_once == 0)) { + /* huh, this should not happen unless all packets + * are PR-SCTP and marked to skip of course. + */ + if (sctp_fs_audit(asoc)) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + net->flight_size = 0; + } + asoc->total_flight = 0; + asoc->total_flight_count = 0; + asoc->sent_queue_retran_cnt = 0; + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + sctp_flight_size_increase(tp1); + sctp_total_flight_increase(stcb, tp1); + } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { + sctp_ucount_incr(asoc->sent_queue_retran_cnt); + } + } + } + done_once = 1; + goto again; + } + /**********************************/ + /* Now what about shutdown issues */ + /**********************************/ + if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { + /* nothing left on sendqueue.. consider done */ + /* clean up */ + if ((asoc->stream_queue_cnt == 1) && + ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || + (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && + (asoc->locked_on_sending) + ) { + struct sctp_stream_queue_pending *sp; + /* I may be in a state where we got + * all across.. but cannot write more due + * to a shutdown... we abort since the + * user did not indicate EOR in this case. The + * sp will be cleaned during free of the asoc. + */ + sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), + sctp_streamhead); + if ((sp) && (sp->length == 0)) { + /* Let cleanup code purge it */ + if (sp->msg_is_complete) { + asoc->stream_queue_cnt--; + } else { + asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; + asoc->locked_on_sending = NULL; + asoc->stream_queue_cnt--; + } + } + } + if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && + (asoc->stream_queue_cnt == 0)) { + if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { + /* Need to abort here */ + struct mbuf *op_err; + + abort_out_now: + *abort_now = 1; + /* XXX */ + op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + } else { + struct sctp_nets *netp; + + if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || + (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { + SCTP_STAT_DECR_GAUGE32(sctps_currestab); + } + SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); + SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); + sctp_stop_timers_for_shutdown(stcb); + if (asoc->alternate) { + netp = asoc->alternate; + } else { + netp = asoc->primary_destination; + } + sctp_send_shutdown(stcb, netp); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, + stcb->sctp_ep, stcb, netp); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, netp); + } + } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && + (asoc->stream_queue_cnt == 0)) { + struct sctp_nets *netp; + + if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { + goto abort_out_now; + } + SCTP_STAT_DECR_GAUGE32(sctps_currestab); + SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); + SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); + sctp_stop_timers_for_shutdown(stcb); + if (asoc->alternate) { + netp = asoc->alternate; + } else { + netp = asoc->primary_destination; + } + sctp_send_shutdown_ack(stcb, netp); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, + stcb->sctp_ep, stcb, netp); + } + } + /*********************************************/ + /* Here we perform PR-SCTP procedures */ + /* (section 4.2) */ + /*********************************************/ + /* C1. update advancedPeerAckPoint */ + if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) { + asoc->advanced_peer_ack_point = cumack; + } + /* PR-Sctp issues need to be addressed too */ + if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { + struct sctp_tmit_chunk *lchk; + uint32_t old_adv_peer_ack_point; + + old_adv_peer_ack_point = asoc->advanced_peer_ack_point; + lchk = sctp_try_advance_peer_ack_point(stcb, asoc); + /* C3. See if we need to send a Fwd-TSN */ + if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) { + /* + * ISSUE with ECN, see FWD-TSN processing. + */ + if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { + send_forward_tsn(stcb, asoc); + } else if (lchk) { + /* try to FR fwd-tsn's that get lost too */ + if (lchk->rec.data.fwd_tsn_cnt >= 3) { + send_forward_tsn(stcb, asoc); + } + } + } + if (lchk) { + /* Assure a timer is up */ + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, lchk->whoTo); + } + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_SACK_RWND_UPDATE, + rwnd, + stcb->asoc.peers_rwnd, + stcb->asoc.total_flight, + stcb->asoc.total_output_queue_size); + } +} + +void +sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup, + struct sctp_tcb *stcb, + uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup, + int *abort_now, uint8_t flags, + uint32_t cum_ack, uint32_t rwnd, int ecne_seen) +{ + struct sctp_association *asoc; + struct sctp_tmit_chunk *tp1, *tp2; + uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; + uint16_t wake_him = 0; + uint32_t send_s = 0; + long j; + int accum_moved = 0; + int will_exit_fast_recovery = 0; + uint32_t a_rwnd, old_rwnd; + int win_probe_recovery = 0; + int win_probe_recovered = 0; + struct sctp_nets *net = NULL; + int done_once; + int rto_ok = 1; + uint8_t reneged_all = 0; + uint8_t cmt_dac_flag; + /* + * we take any chance we can to service our queues since we cannot + * get awoken when the socket is read from :< + */ + /* + * Now perform the actual SACK handling: 1) Verify that it is not an + * old sack, if so discard. 2) If there is nothing left in the send + * queue (cum-ack is equal to last acked) then you have a duplicate + * too, update any rwnd change and verify no timers are running. + * then return. 3) Process any new consequtive data i.e. cum-ack + * moved process these first and note that it moved. 4) Process any + * sack blocks. 5) Drop any acked from the queue. 6) Check for any + * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, + * sync up flightsizes and things, stop all timers and also check + * for shutdown_pending state. If so then go ahead and send off the + * shutdown. If in shutdown recv, send off the shutdown-ack and + * start that timer, Ret. 9) Strike any non-acked things and do FR + * procedure if needed being sure to set the FR flag. 10) Do pr-sctp + * procedures. 11) Apply any FR penalties. 12) Assure we will SACK + * if in shutdown_recv state. + */ + SCTP_TCB_LOCK_ASSERT(stcb); + /* CMT DAC algo */ + this_sack_lowest_newack = 0; + SCTP_STAT_INCR(sctps_slowpath_sack); + last_tsn = cum_ack; + cmt_dac_flag = flags & SCTP_SACK_CMT_DAC; +#ifdef SCTP_ASOCLOG_OF_TSNS + stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; + stcb->asoc.cumack_log_at++; + if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { + stcb->asoc.cumack_log_at = 0; + } +#endif + a_rwnd = rwnd; + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { + sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, + rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); + } + + old_rwnd = stcb->asoc.peers_rwnd; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INDATA, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + asoc = &stcb->asoc; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(asoc->last_acked_seq, + cum_ack, + 0, + num_seg, + num_dup, + SCTP_LOG_NEW_SACK); + } + if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) { + uint16_t i; + uint32_t *dupdata, dblock; + + for (i = 0; i < num_dup; i++) { + dupdata = (uint32_t *)sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t), + sizeof(uint32_t), (uint8_t *)&dblock); + if (dupdata == NULL) { + break; + } + sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); + } + } + if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { + /* reality check */ + if (!TAILQ_EMPTY(&asoc->sent_queue)) { + tp1 = TAILQ_LAST(&asoc->sent_queue, + sctpchunk_listhead); + send_s = tp1->rec.data.TSN_seq + 1; + } else { + tp1 = NULL; + send_s = asoc->sending_seq; + } + if (SCTP_TSN_GE(cum_ack, send_s)) { + struct mbuf *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + + /* + * no way, we have not even sent this TSN out yet. + * Peer is hopelessly messed up with us. + */ + SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n", + cum_ack, send_s); + if (tp1) { + SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n", + tp1->rec.data.TSN_seq, (void *)tp1); + } + hopeless_peer: + *abort_now = 1; + /* XXX */ + snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x", + cum_ack, send_s); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + return; + } + } + /**********************/ + /* 1) check the range */ + /**********************/ + if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) { + /* acking something behind */ + return; + } + + /* update the Rwnd of the peer */ + if (TAILQ_EMPTY(&asoc->sent_queue) && + TAILQ_EMPTY(&asoc->send_queue) && + (asoc->stream_queue_cnt == 0)) { + /* nothing left on send/sent and strmq */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { + sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, + asoc->peers_rwnd, 0, 0, a_rwnd); + } + asoc->peers_rwnd = a_rwnd; + if (asoc->sent_queue_retran_cnt) { + asoc->sent_queue_retran_cnt = 0; + } + if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { + /* SWS sender side engages */ + asoc->peers_rwnd = 0; + } + /* stop any timers */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); + net->partial_bytes_acked = 0; + net->flight_size = 0; + } + asoc->total_flight = 0; + asoc->total_flight_count = 0; + return; + } + /* + * We init netAckSz and netAckSz2 to 0. These are used to track 2 + * things. The total byte count acked is tracked in netAckSz AND + * netAck2 is used to track the total bytes acked that are un- + * amibguious and were never retransmitted. We track these on a per + * destination address basis. + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) { + /* Drag along the window_tsn for cwr's */ + net->cwr_window_tsn = cum_ack; + } + net->prev_cwnd = net->cwnd; + net->net_ack = 0; + net->net_ack2 = 0; + + /* + * CMT: Reset CUC and Fast recovery algo variables before + * SACK processing + */ + net->new_pseudo_cumack = 0; + net->will_exit_fast_recovery = 0; + if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { + (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack)(stcb, net); + } + } + /* process the new consecutive TSN first */ + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) { + if (tp1->sent != SCTP_DATAGRAM_UNSENT) { + accum_moved = 1; + if (tp1->sent < SCTP_DATAGRAM_ACKED) { + /* + * If it is less than ACKED, it is + * now no-longer in flight. Higher + * values may occur during marking + */ + if ((tp1->whoTo->dest_state & + SCTP_ADDR_UNCONFIRMED) && + (tp1->snd_count < 2)) { + /* + * If there was no retran + * and the address is + * un-confirmed and we sent + * there and are now + * sacked.. its confirmed, + * mark it so. + */ + tp1->whoTo->dest_state &= + ~SCTP_ADDR_UNCONFIRMED; + } + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, + tp1->whoTo->flight_size, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } + sctp_flight_size_decrease(tp1); + sctp_total_flight_decrease(stcb, tp1); + if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { + (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo, + tp1); + } + } + tp1->whoTo->net_ack += tp1->send_size; + + /* CMT SFR and DAC algos */ + this_sack_lowest_newack = tp1->rec.data.TSN_seq; + tp1->whoTo->saw_newack = 1; + + if (tp1->snd_count < 2) { + /* + * True non-retransmited + * chunk + */ + tp1->whoTo->net_ack2 += + tp1->send_size; + + /* update RTO too? */ + if (tp1->do_rtt) { + if (rto_ok) { + tp1->whoTo->RTO = + sctp_calculate_rto(stcb, + asoc, tp1->whoTo, + &tp1->sent_rcv_time, + sctp_align_safe_nocopy, + SCTP_RTT_FROM_DATA); + rto_ok = 0; + } + if (tp1->whoTo->rto_needed == 0) { + tp1->whoTo->rto_needed = 1; + } + tp1->do_rtt = 0; + } + } + /* + * CMT: CUCv2 algorithm. From the + * cumack'd TSNs, for each TSN being + * acked for the first time, set the + * following variables for the + * corresp destination. + * new_pseudo_cumack will trigger a + * cwnd update. + * find_(rtx_)pseudo_cumack will + * trigger search for the next + * expected (rtx-)pseudo-cumack. + */ + tp1->whoTo->new_pseudo_cumack = 1; + tp1->whoTo->find_pseudo_cumack = 1; + tp1->whoTo->find_rtx_pseudo_cumack = 1; + + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(asoc->last_acked_seq, + cum_ack, + tp1->rec.data.TSN_seq, + 0, + 0, + SCTP_LOG_TSN_ACKED); + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); + } + } + if (tp1->sent == SCTP_DATAGRAM_RESEND) { + sctp_ucount_decr(asoc->sent_queue_retran_cnt); +#ifdef SCTP_AUDITING_ENABLED + sctp_audit_log(0xB3, + (asoc->sent_queue_retran_cnt & 0x000000ff)); +#endif + } + if (tp1->rec.data.chunk_was_revoked) { + /* deflate the cwnd */ + tp1->whoTo->cwnd -= tp1->book_size; + tp1->rec.data.chunk_was_revoked = 0; + } + if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { + tp1->sent = SCTP_DATAGRAM_ACKED; + } + } + } else { + break; + } + } + biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; + /* always set this up to cum-ack */ + asoc->this_sack_highest_gap = last_tsn; + + if ((num_seg > 0) || (num_nr_seg > 0)) { + + /* + * CMT: SFR algo (and HTNA) - this_sack_highest_newack has + * to be greater than the cumack. Also reset saw_newack to 0 + * for all dests. + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + net->saw_newack = 0; + net->this_sack_highest_newack = last_tsn; + } + + /* + * thisSackHighestGap will increase while handling NEW + * segments this_sack_highest_newack will increase while + * handling NEWLY ACKED chunks. this_sack_lowest_newack is + * used for CMT DAC algo. saw_newack will also change. + */ + if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked, + &biggest_tsn_newly_acked, &this_sack_lowest_newack, + num_seg, num_nr_seg, &rto_ok)) { + wake_him++; + } + if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { + /* + * validate the biggest_tsn_acked in the gap acks if + * strict adherence is wanted. + */ + if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) { + /* + * peer is either confused or we are under + * attack. We must abort. + */ + SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n", + biggest_tsn_acked, send_s); + goto hopeless_peer; + } + } + } + /*******************************************/ + /* cancel ALL T3-send timer if accum moved */ + /*******************************************/ + if (asoc->sctp_cmt_on_off > 0) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (net->new_pseudo_cumack) + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, net, + SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); + + } + } else { + if (accum_moved) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); + } + } + } + /********************************************/ + /* drop the acked chunks from the sentqueue */ + /********************************************/ + asoc->last_acked_seq = cum_ack; + + TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { + if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) { + break; + } + if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { + if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { + asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; +#ifdef INVARIANTS + } else { + panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); +#endif + } + } + TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); + if (PR_SCTP_ENABLED(tp1->flags)) { + if (asoc->pr_sctp_cnt != 0) + asoc->pr_sctp_cnt--; + } + asoc->sent_queue_cnt--; + if (tp1->data) { + /* sa_ignore NO_NULL_CHK */ + sctp_free_bufspace(stcb, asoc, tp1, 1); + sctp_m_freem(tp1->data); + tp1->data = NULL; + if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) { + asoc->sent_queue_cnt_removeable--; + } + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { + sctp_log_sack(asoc->last_acked_seq, + cum_ack, + tp1->rec.data.TSN_seq, + 0, + 0, + SCTP_LOG_FREE_SENT); + } + sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); + wake_him++; + } + if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) { +#ifdef INVARIANTS + panic("Warning flight size is postive and should be 0"); +#else + SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", + asoc->total_flight); +#endif + asoc->total_flight = 0; + } + +#if defined(__Userspace__) + if (stcb->sctp_ep->recv_callback) { + if (stcb->sctp_socket) { + uint32_t inqueue_bytes, sb_free_now; + struct sctp_inpcb *inp; + + inp = stcb->sctp_ep; + inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk)); + sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv); + + /* check if the amount free in the send socket buffer crossed the threshold */ + if (inp->send_callback && + (((inp->send_sb_threshold > 0) && (sb_free_now >= inp->send_sb_threshold)) || + (inp->send_sb_threshold == 0))) { + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + inp->send_callback(stcb->sctp_socket, sb_free_now); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + } + } + } else if ((wake_him) && (stcb->sctp_socket)) { +#else + /* sa_ignore NO_NULL_CHK */ + if ((wake_him) && (stcb->sctp_socket)) { +#endif +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + struct socket *so; + +#endif + SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { + sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK); + } +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + /* assoc was freed while we were unlocked */ + SCTP_SOCKET_UNLOCK(so, 1); + return; + } +#endif + sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); +#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { + sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK); + } + } + + if (asoc->fast_retran_loss_recovery && accum_moved) { + if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) { + /* Setup so we will exit RFC2582 fast recovery */ + will_exit_fast_recovery = 1; + } + } + /* + * Check for revoked fragments: + * + * if Previous sack - Had no frags then we can't have any revoked if + * Previous sack - Had frag's then - If we now have frags aka + * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked + * some of them. else - The peer revoked all ACKED fragments, since + * we had some before and now we have NONE. + */ + + if (num_seg) { + sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); + asoc->saw_sack_with_frags = 1; + } else if (asoc->saw_sack_with_frags) { + int cnt_revoked = 0; + + /* Peer revoked all dg's marked or acked */ + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (tp1->sent == SCTP_DATAGRAM_ACKED) { + tp1->sent = SCTP_DATAGRAM_SENT; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, + tp1->whoTo->flight_size, + tp1->book_size, + (uintptr_t)tp1->whoTo, + tp1->rec.data.TSN_seq); + } + sctp_flight_size_increase(tp1); + sctp_total_flight_increase(stcb, tp1); + tp1->rec.data.chunk_was_revoked = 1; + /* + * To ensure that this increase in + * flightsize, which is artificial, + * does not throttle the sender, we + * also increase the cwnd + * artificially. + */ + tp1->whoTo->cwnd += tp1->book_size; + cnt_revoked++; + } + } + if (cnt_revoked) { + reneged_all = 1; + } + asoc->saw_sack_with_frags = 0; + } + if (num_nr_seg > 0) + asoc->saw_sack_with_nr_frags = 1; + else + asoc->saw_sack_with_nr_frags = 0; + + /* JRS - Use the congestion control given in the CC module */ + if (ecne_seen == 0) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (net->net_ack2 > 0) { + /* + * Karn's rule applies to clearing error count, this + * is optional. + */ + net->error_count = 0; + if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { + /* addr came good */ + net->dest_state |= SCTP_ADDR_REACHABLE; + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, + 0, (void *)net, SCTP_SO_NOT_LOCKED); + } + + if (net == stcb->asoc.primary_destination) { + if (stcb->asoc.alternate) { + /* release the alternate, primary is good */ + sctp_free_remote_addr(stcb->asoc.alternate); + stcb->asoc.alternate = NULL; + } + } + + if (net->dest_state & SCTP_ADDR_PF) { + net->dest_state &= ~SCTP_ADDR_PF; + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); + sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); + asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); + /* Done with this net */ + net->net_ack = 0; + } + /* restore any doubled timers */ + net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; + if (net->RTO < stcb->asoc.minrto) { + net->RTO = stcb->asoc.minrto; + } + if (net->RTO > stcb->asoc.maxrto) { + net->RTO = stcb->asoc.maxrto; + } + } + } + asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); + } + + if (TAILQ_EMPTY(&asoc->sent_queue)) { + /* nothing left in-flight */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + /* stop all timers */ + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); + net->flight_size = 0; + net->partial_bytes_acked = 0; + } + asoc->total_flight = 0; + asoc->total_flight_count = 0; + } + + /**********************************/ + /* Now what about shutdown issues */ + /**********************************/ + if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { + /* nothing left on sendqueue.. consider done */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { + sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, + asoc->peers_rwnd, 0, 0, a_rwnd); + } + asoc->peers_rwnd = a_rwnd; + if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { + /* SWS sender side engages */ + asoc->peers_rwnd = 0; + } + /* clean up */ + if ((asoc->stream_queue_cnt == 1) && + ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || + (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && + (asoc->locked_on_sending) + ) { + struct sctp_stream_queue_pending *sp; + /* I may be in a state where we got + * all across.. but cannot write more due + * to a shutdown... we abort since the + * user did not indicate EOR in this case. + */ + sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), + sctp_streamhead); + if ((sp) && (sp->length == 0)) { + asoc->locked_on_sending = NULL; + if (sp->msg_is_complete) { + asoc->stream_queue_cnt--; + } else { + asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; + asoc->stream_queue_cnt--; + } + } + } + if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && + (asoc->stream_queue_cnt == 0)) { + if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { + /* Need to abort here */ + struct mbuf *op_err; + + abort_out_now: + *abort_now = 1; + /* XXX */ + op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + return; + } else { + struct sctp_nets *netp; + + if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || + (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { + SCTP_STAT_DECR_GAUGE32(sctps_currestab); + } + SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); + SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); + sctp_stop_timers_for_shutdown(stcb); + if (asoc->alternate) { + netp = asoc->alternate; + } else { + netp = asoc->primary_destination; + } + sctp_send_shutdown(stcb, netp); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, + stcb->sctp_ep, stcb, netp); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, netp); + } + return; + } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && + (asoc->stream_queue_cnt == 0)) { + struct sctp_nets *netp; + + if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { + goto abort_out_now; + } + SCTP_STAT_DECR_GAUGE32(sctps_currestab); + SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); + SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); + sctp_stop_timers_for_shutdown(stcb); + if (asoc->alternate) { + netp = asoc->alternate; + } else { + netp = asoc->primary_destination; + } + sctp_send_shutdown_ack(stcb, netp); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, + stcb->sctp_ep, stcb, netp); + return; + } + } + /* + * Now here we are going to recycle net_ack for a different use... + * HEADS UP. + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + net->net_ack = 0; + } + + /* + * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking + * to be done. Setting this_sack_lowest_newack to the cum_ack will + * automatically ensure that. + */ + if ((asoc->sctp_cmt_on_off > 0) && + SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && + (cmt_dac_flag == 0)) { + this_sack_lowest_newack = cum_ack; + } + if ((num_seg > 0) || (num_nr_seg > 0)) { + sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, + biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); + } + /* JRS - Use the congestion control given in the CC module */ + asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); + + /* Now are we exiting loss recovery ? */ + if (will_exit_fast_recovery) { + /* Ok, we must exit fast recovery */ + asoc->fast_retran_loss_recovery = 0; + } + if ((asoc->sat_t3_loss_recovery) && + SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) { + /* end satellite t3 loss recovery */ + asoc->sat_t3_loss_recovery = 0; + } + /* + * CMT Fast recovery + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (net->will_exit_fast_recovery) { + /* Ok, we must exit fast recovery */ + net->fast_retran_loss_recovery = 0; + } + } + + /* Adjust and set the new rwnd value */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { + sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, + asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); + } + asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, + (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); + if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { + /* SWS sender side engages */ + asoc->peers_rwnd = 0; + } + if (asoc->peers_rwnd > old_rwnd) { + win_probe_recovery = 1; + } + + /* + * Now we must setup so we have a timer up for anyone with + * outstanding data. + */ + done_once = 0; +again: + j = 0; + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if (win_probe_recovery && (net->window_probe)) { + win_probe_recovered = 1; + /*- + * Find first chunk that was used with + * window probe and clear the event. Put + * it back into the send queue as if has + * not been sent. + */ + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (tp1->window_probe) { + sctp_window_probe_recovery(stcb, asoc, tp1); + break; + } + } + } + if (net->flight_size) { + j++; + if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net); + } + if (net->window_probe) { + net->window_probe = 0; + } + } else { + if (net->window_probe) { + /* In window probes we must assure a timer is still running there */ + if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net); + + } + } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, net, + SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); + } + } + } + if ((j == 0) && + (!TAILQ_EMPTY(&asoc->sent_queue)) && + (asoc->sent_queue_retran_cnt == 0) && + (win_probe_recovered == 0) && + (done_once == 0)) { + /* huh, this should not happen unless all packets + * are PR-SCTP and marked to skip of course. + */ + if (sctp_fs_audit(asoc)) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + net->flight_size = 0; + } + asoc->total_flight = 0; + asoc->total_flight_count = 0; + asoc->sent_queue_retran_cnt = 0; + TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + sctp_flight_size_increase(tp1); + sctp_total_flight_increase(stcb, tp1); + } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { + sctp_ucount_incr(asoc->sent_queue_retran_cnt); + } + } + } + done_once = 1; + goto again; + } + /*********************************************/ + /* Here we perform PR-SCTP procedures */ + /* (section 4.2) */ + /*********************************************/ + /* C1. update advancedPeerAckPoint */ + if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) { + asoc->advanced_peer_ack_point = cum_ack; + } + /* C2. try to further move advancedPeerAckPoint ahead */ + if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { + struct sctp_tmit_chunk *lchk; + uint32_t old_adv_peer_ack_point; + + old_adv_peer_ack_point = asoc->advanced_peer_ack_point; + lchk = sctp_try_advance_peer_ack_point(stcb, asoc); + /* C3. See if we need to send a Fwd-TSN */ + if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) { + /* + * ISSUE with ECN, see FWD-TSN processing. + */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { + sctp_misc_ints(SCTP_FWD_TSN_CHECK, + 0xee, cum_ack, asoc->advanced_peer_ack_point, + old_adv_peer_ack_point); + } + if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { + send_forward_tsn(stcb, asoc); + } else if (lchk) { + /* try to FR fwd-tsn's that get lost too */ + if (lchk->rec.data.fwd_tsn_cnt >= 3) { + send_forward_tsn(stcb, asoc); + } + } + } + if (lchk) { + /* Assure a timer is up */ + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, lchk->whoTo); + } + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_SACK_RWND_UPDATE, + a_rwnd, + stcb->asoc.peers_rwnd, + stcb->asoc.total_flight, + stcb->asoc.total_output_queue_size); + } +} + +void +sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag) +{ + /* Copy cum-ack */ + uint32_t cum_ack, a_rwnd; + + cum_ack = ntohl(cp->cumulative_tsn_ack); + /* Arrange so a_rwnd does NOT change */ + a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; + + /* Now call the express sack handling */ + sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0); +} + +static void +sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, + struct sctp_stream_in *strmin) +{ + struct sctp_queued_to_read *ctl, *nctl; + struct sctp_association *asoc; + uint16_t tt; + + asoc = &stcb->asoc; + tt = strmin->last_sequence_delivered; + /* + * First deliver anything prior to and including the stream no that + * came in + */ + TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { + if (SCTP_SSN_GE(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_mark_non_revokable(asoc, ctl->sinfo_tsn); + sctp_add_to_readq(stcb->sctp_ep, stcb, + ctl, + &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); + } + } else { + /* no more delivery now. */ + break; + } + } + /* + * now we must deliver things in queue the normal way if any are + * now ready. + */ + tt = strmin->last_sequence_delivered + 1; + TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { + 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_mark_non_revokable(asoc, ctl->sinfo_tsn); + sctp_add_to_readq(stcb->sctp_ep, stcb, + ctl, + &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); + + } + tt = strmin->last_sequence_delivered + 1; + } else { + break; + } + } +} + +static void +sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, + struct sctp_association *asoc, + uint16_t stream, uint16_t seq) +{ + struct sctp_tmit_chunk *chk, *nchk; + + /* 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. + */ + TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { + /* Do not toss it if on a different stream or + * marked for unordered delivery in which case + * the stream sequence number has no meaning. + */ + if ((chk->rec.data.stream_number != stream) || + ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) { + continue; + } + if (chk->rec.data.stream_seq == seq) { + /* It needs to be tossed */ + TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); + if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { + 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); + + /* Clear up any stream problem */ + if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && + SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { + /* + * 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_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) { + /* If the stream_seq is > than the purging one, we are done */ + break; + } + } +} + + +void +sctp_handle_forward_tsn(struct sctp_tcb *stcb, + struct sctp_forward_tsn_chunk *fwd, + int *abort_flag, struct mbuf *m ,int offset) +{ + /* The pr-sctp fwd tsn */ + /* + * here we will perform all the data receiver side steps for + * processing FwdTSN, as required in by pr-sctp draft: + * + * Assume we get FwdTSN(x): + * + * 1) update local cumTSN to x 2) try to further advance cumTSN to x + + * others we have 3) examine and update re-ordering queue on + * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to + * report where we are. + */ + struct sctp_association *asoc; + uint32_t new_cum_tsn, gap; + unsigned int i, fwd_sz, m_size; + uint32_t str_seq; + struct sctp_stream_in *strm; + struct sctp_tmit_chunk *chk, *nchk; + struct sctp_queued_to_read *ctl, *sv; + + asoc = &stcb->asoc; + if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { + SCTPDBG(SCTP_DEBUG_INDATA1, + "Bad size too small/big fwd-tsn\n"); + return; + } + m_size = (stcb->asoc.mapping_array_size << 3); + /*************************************************************/ + /* 1. Here we update local cumTSN and shift the bitmap array */ + /*************************************************************/ + new_cum_tsn = ntohl(fwd->new_cumulative_tsn); + + if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) { + /* Already got there ... */ + return; + } + /* + * now we know the new TSN is more advanced, let's find the actual + * gap + */ + SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn); + asoc->cumulative_tsn = new_cum_tsn; + if (gap >= m_size) { + if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { + struct mbuf *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + + /* + * out of range (of single byte chunks in the rwnd I + * give out). This must be an attacker. + */ + *abort_flag = 1; + snprintf(msg, sizeof(msg), + "New cum ack %8.8x too high, highest TSN %8.8x", + new_cum_tsn, asoc->highest_tsn_inside_map); + op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); + stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_33; + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + return; + } + SCTP_STAT_INCR(sctps_fwdtsn_map_over); + + memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); + asoc->mapping_array_base_tsn = new_cum_tsn + 1; + asoc->highest_tsn_inside_map = new_cum_tsn; + + memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); + asoc->highest_tsn_inside_nr_map = new_cum_tsn; + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); + } + } else { + SCTP_TCB_LOCK_ASSERT(stcb); + for (i = 0; i <= gap; i++) { + if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) && + !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) { + SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); + if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) { + asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i; + } + } + } + } + /*************************************************************/ + /* 2. Clear up re-assembly queue */ + /*************************************************************/ + /* + * 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); + } + /* 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. + */ + TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { + if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) { + /* It needs to be tossed */ + TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); + if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { + 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); + + /* Clear up any stream problem */ + if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && + SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { + /* + * 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_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + } else { + /* + * Ok we have gone beyond the end of the + * fwd-tsn's mark. + */ + break; + } + } + /*******************************************************/ + /* 3. Update the PR-stream re-ordering queues and fix */ + /* delivery issues as needed. */ + /*******************************************************/ + fwd_sz -= sizeof(*fwd); + if (m && fwd_sz) { + /* New method. */ + unsigned int num_str; + struct sctp_strseq *stseq, strseqbuf; + offset += sizeof(*fwd); + + SCTP_INP_READ_LOCK(stcb->sctp_ep); + num_str = fwd_sz / sizeof(struct sctp_strseq); + for (i = 0; i < num_str; i++) { + uint16_t st; + 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 */ + st = ntohs(stseq->stream); + stseq->stream = st; + st = ntohs(stseq->sequence); + stseq->sequence = st; + + /* now process */ + + /* + * Ok we now look for the stream/seq on the read queue + * where its not all delivered. If we find it we transmute the + * read entry into a PDI_ABORTED. + */ + if (stseq->stream >= asoc->streamincnt) { + /* screwed up streams, stop! */ + break; + } + if ((asoc->str_of_pdapi == stseq->stream) && + (asoc->ssn_of_pdapi == stseq->sequence)) { + /* If this is the one we were partially delivering + * now then we no longer are. Note this will change + * with the reassembly re-write. + */ + asoc->fragmented_delivery_inprogress = 0; + } + sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence); + TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) { + if ((ctl->sinfo_stream == stseq->stream) && + (ctl->sinfo_ssn == stseq->sequence)) { + str_seq = (stseq->stream << 16) | stseq->sequence; + ctl->end_added = 1; + ctl->pdapi_aborted = 1; + sv = stcb->asoc.control_pdapi; + stcb->asoc.control_pdapi = ctl; + sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, + stcb, + SCTP_PARTIAL_DELIVERY_ABORTED, + (void *)&str_seq, + SCTP_SO_NOT_LOCKED); + stcb->asoc.control_pdapi = sv; + break; + } else if ((ctl->sinfo_stream == stseq->stream) && + SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) { + /* We are past our victim SSN */ + break; + } + } + strm = &asoc->strmin[stseq->stream]; + if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) { + /* Update the sequence number */ + strm->last_sequence_delivered = stseq->sequence; + } + /* now kick the stream the new way */ + /*sa_ignore NO_NULL_CHK*/ + sctp_kick_prsctp_reorder_queue(stcb, strm); + } + SCTP_INP_READ_UNLOCK(stcb->sctp_ep); + } + /* + * Now slide thing forward. + */ + sctp_slide_mapping_arrays(stcb); + + if (!TAILQ_EMPTY(&asoc->reasmqueue)) { + /* now lets kick out and check for more fragmented delivery */ + /*sa_ignore NO_NULL_CHK*/ + sctp_deliver_reasm_check(stcb, &stcb->asoc); + } +} |