/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * a) Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * b) Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * * c) Neither the name of Cisco Systems, Inc. nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #ifdef __FreeBSD__ #include __FBSDID("$FreeBSD: head/sys/netinet/sctp_indata.c 359152 2020-03-19 21:01:16Z tuexen $"); #endif #include #ifdef __FreeBSD__ #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __FreeBSD__ #include #endif /* * NOTES: On the outbound side of things I need to check the sack timer to * see if I should generate a sack into the chunk queue (if I have data to * send that is and will be sending it .. for bundling. * * The callback in sctp_usrreq.c will get called when the socket is read from. * This will cause sctp_service_queues() to get called on the top entry in * the list. */ static uint32_t sctp_add_chk_to_control(struct sctp_queued_to_read *control, struct sctp_stream_in *strm, struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_tmit_chunk *chk, int lock_held); void sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) { asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); } /* Calculate what the rwnd would be */ uint32_t sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) { uint32_t calc = 0; /* * This is really set wrong with respect to a 1-2-m socket. Since * the sb_cc is the count that everyone as put up. When we re-write * sctp_soreceive then we will fix this so that ONLY this * associations data is taken into account. */ if (stcb->sctp_socket == NULL) { return (calc); } KASSERT(asoc->cnt_on_reasm_queue > 0 || asoc->size_on_reasm_queue == 0, ("size_on_reasm_queue is %u", asoc->size_on_reasm_queue)); KASSERT(asoc->cnt_on_all_streams > 0 || asoc->size_on_all_streams == 0, ("size_on_all_streams is %u", asoc->size_on_all_streams)); if (stcb->asoc.sb_cc == 0 && asoc->cnt_on_reasm_queue == 0 && asoc->cnt_on_all_streams == 0) { /* Full rwnd granted */ calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND); return (calc); } /* get actual space */ calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); /* * take out what has NOT been put on socket queue and we yet hold * for putting up. */ calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_reasm_queue + asoc->cnt_on_reasm_queue * MSIZE)); calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_all_streams + asoc->cnt_on_all_streams * MSIZE)); if (calc == 0) { /* out of space */ return (calc); } /* what is the overhead of all these rwnd's */ calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); /* If the window gets too small due to ctrl-stuff, reduce it * to 1, even it is 0. SWS engaged */ if (calc < stcb->asoc.my_rwnd_control_len) { calc = 1; } return (calc); } /* * Build out our readq entry based on the incoming packet. */ struct sctp_queued_to_read * sctp_build_readq_entry(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t tsn, uint32_t ppid, uint32_t context, uint16_t sid, uint32_t mid, uint8_t flags, struct mbuf *dm) { struct sctp_queued_to_read *read_queue_e = NULL; sctp_alloc_a_readq(stcb, read_queue_e); if (read_queue_e == NULL) { goto failed_build; } memset(read_queue_e, 0, sizeof(struct sctp_queued_to_read)); read_queue_e->sinfo_stream = sid; read_queue_e->sinfo_flags = (flags << 8); read_queue_e->sinfo_ppid = ppid; read_queue_e->sinfo_context = context; read_queue_e->sinfo_tsn = tsn; read_queue_e->sinfo_cumtsn = tsn; read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); read_queue_e->mid = mid; read_queue_e->top_fsn = read_queue_e->fsn_included = 0xffffffff; TAILQ_INIT(&read_queue_e->reasm); read_queue_e->whoFrom = net; atomic_add_int(&net->ref_count, 1); read_queue_e->data = dm; read_queue_e->stcb = stcb; read_queue_e->port_from = stcb->rport; failed_build: return (read_queue_e); } struct mbuf * sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo) { struct sctp_extrcvinfo *seinfo; struct sctp_sndrcvinfo *outinfo; struct sctp_rcvinfo *rcvinfo; struct sctp_nxtinfo *nxtinfo; #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->serinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) { provide_nxt = 1; len += CMSG_SPACE(sizeof(struct sctp_nxtinfo)); } else { provide_nxt = 0; } if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { use_extended = 1; len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); } else { use_extended = 0; len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); } } else { use_extended = 0; } ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); if (ret == NULL) { /* No space */ return (ret); } SCTP_BUF_LEN(ret) = 0; /* We need a CMSG header followed by the struct */ #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->serinfo_next_stream; nxtinfo->nxt_flags = 0; if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) { nxtinfo->nxt_flags |= SCTP_UNORDERED; } if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) { nxtinfo->nxt_flags |= SCTP_NOTIFICATION; } if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) { nxtinfo->nxt_flags |= SCTP_COMPLETE; } nxtinfo->nxt_ppid = seinfo->serinfo_next_ppid; nxtinfo->nxt_length = seinfo->serinfo_next_length; nxtinfo->nxt_assoc_id = seinfo->serinfo_next_aid; #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; int in_r=0, in_nr=0; if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { return; } cumackp1 = asoc->cumulative_tsn + 1; if (SCTP_TSN_GT(cumackp1, tsn)) { /* this tsn is behind the cum ack and thus we don't * need to worry about it being moved from one to the other. */ return; } SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); in_r = SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap); in_nr = SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap); if ((in_r == 0) && (in_nr == 0)) { #ifdef INVARIANTS panic("Things are really messed up now"); #else SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn); sctp_print_mapping_array(asoc); #endif } if (in_nr == 0) SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); if (in_r) SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap); if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { asoc->highest_tsn_inside_nr_map = tsn; } if (tsn == asoc->highest_tsn_inside_map) { /* We must back down to see what the new highest is */ for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) { SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn); if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { asoc->highest_tsn_inside_map = i; fnd = 1; break; } } if (!fnd) { asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1; } } } static int sctp_place_control_in_stream(struct sctp_stream_in *strm, struct sctp_association *asoc, struct sctp_queued_to_read *control) { struct sctp_queued_to_read *at; struct sctp_readhead *q; uint8_t flags, unordered; flags = (control->sinfo_flags >> 8); unordered = flags & SCTP_DATA_UNORDERED; if (unordered) { q = &strm->uno_inqueue; if (asoc->idata_supported == 0) { if (!TAILQ_EMPTY(q)) { /* Only one stream can be here in old style -- abort */ return (-1); } TAILQ_INSERT_TAIL(q, control, next_instrm); control->on_strm_q = SCTP_ON_UNORDERED; return (0); } } else { q = &strm->inqueue; } if ((flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) { control->end_added = 1; control->first_frag_seen = 1; control->last_frag_seen = 1; } if (TAILQ_EMPTY(q)) { /* Empty queue */ TAILQ_INSERT_HEAD(q, control, next_instrm); if (unordered) { control->on_strm_q = SCTP_ON_UNORDERED; } else { control->on_strm_q = SCTP_ON_ORDERED; } return (0); } else { TAILQ_FOREACH(at, q, next_instrm) { if (SCTP_MID_GT(asoc->idata_supported, at->mid, control->mid)) { /* * one in queue is bigger than the * new one, insert before this one */ TAILQ_INSERT_BEFORE(at, control, next_instrm); if (unordered) { control->on_strm_q = SCTP_ON_UNORDERED; } else { control->on_strm_q = SCTP_ON_ORDERED ; } break; } else if (SCTP_MID_EQ(asoc->idata_supported, at->mid, control->mid)) { /* * Gak, He sent me a duplicate msg * id number?? return -1 to abort. */ return (-1); } else { if (TAILQ_NEXT(at, next_instrm) == NULL) { /* * We are at the end, insert * it after this one */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, at, SCTP_STR_LOG_FROM_INSERT_TL); } TAILQ_INSERT_AFTER(q, at, control, next_instrm); if (unordered) { control->on_strm_q = SCTP_ON_UNORDERED ; } else { control->on_strm_q = SCTP_ON_ORDERED ; } break; } } } } return (0); } static void sctp_abort_in_reasm(struct sctp_tcb *stcb, struct sctp_queued_to_read *control, struct sctp_tmit_chunk *chk, int *abort_flag, int opspot) { char msg[SCTP_DIAG_INFO_LEN]; struct mbuf *oper; if (stcb->asoc.idata_supported) { snprintf(msg, sizeof(msg), "Reass %x,CF:%x,TSN=%8.8x,SID=%4.4x,FSN=%8.8x,MID:%8.8x", opspot, control->fsn_included, chk->rec.data.tsn, chk->rec.data.sid, chk->rec.data.fsn, chk->rec.data.mid); } else { snprintf(msg, sizeof(msg), "Reass %x,CI:%x,TSN=%8.8x,SID=%4.4x,FSN=%4.4x,SSN:%4.4x", opspot, control->fsn_included, chk->rec.data.tsn, chk->rec.data.sid, chk->rec.data.fsn, (uint16_t)chk->rec.data.mid); } oper = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); sctp_m_freem(chk->data); chk->data = NULL; sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; } static void sctp_clean_up_control(struct sctp_tcb *stcb, struct sctp_queued_to_read *control) { /* * The control could not be placed and must be cleaned. */ struct sctp_tmit_chunk *chk, *nchk; TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) { TAILQ_REMOVE(&control->reasm, chk, sctp_next); if (chk->data) sctp_m_freem(chk->data); chk->data = NULL; sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); } sctp_free_remote_addr(control->whoFrom); if (control->data) { sctp_m_freem(control->data); control->data = NULL; } sctp_free_a_readq(stcb, control); } /* * Queue the chunk either right into the socket buffer if it is the next one * to go OR put it in the correct place in the delivery queue. If we do * append to the so_buf, keep doing so until we are out of order as * long as the control's entered are non-fragmented. */ static void sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_queued_to_read *control, int *abort_flag, int *need_reasm) { /* * FIX-ME maybe? What happens when the ssn wraps? If we are getting * all the data in one stream this could happen quite rapidly. One * could use the TSN to keep track of things, but this scheme breaks * down in the other type of stream usage that could occur. Send a * single msg to stream 0, send 4Billion messages to stream 1, now * send a message to stream 0. You have a situation where the TSN * has wrapped but not in the stream. Is this worth worrying about * or should we just change our queue sort at the bottom to be by * TSN. * * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 * with TSN 1? If the peer is doing some sort of funky TSN/SSN * assignment this could happen... and I don't see how this would be * a violation. So for now I am undecided an will leave the sort by * SSN alone. Maybe a hybred approach is the answer * */ struct sctp_queued_to_read *at; int queue_needed; uint32_t nxt_todel; struct mbuf *op_err; struct sctp_stream_in *strm; char msg[SCTP_DIAG_INFO_LEN]; strm = &asoc->strmin[control->sinfo_stream]; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); } if (SCTP_MID_GT((asoc->idata_supported), strm->last_mid_delivered, control->mid)) { /* The incoming sseq is behind where we last delivered? */ SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ: %u delivered: %u from peer, Abort association\n", strm->last_mid_delivered, control->mid); /* * throw it in the stream so it gets cleaned up in * association destruction */ TAILQ_INSERT_HEAD(&strm->inqueue, control, next_instrm); if (asoc->idata_supported) { snprintf(msg, sizeof(msg), "Delivered MID=%8.8x, got TSN=%8.8x, SID=%4.4x, MID=%8.8x", strm->last_mid_delivered, control->sinfo_tsn, control->sinfo_stream, control->mid); } else { snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", (uint16_t)strm->last_mid_delivered, control->sinfo_tsn, control->sinfo_stream, (uint16_t)control->mid); } op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } queue_needed = 1; asoc->size_on_all_streams += control->length; sctp_ucount_incr(asoc->cnt_on_all_streams); nxt_todel = strm->last_mid_delivered + 1; if (SCTP_MID_EQ(asoc->idata_supported, nxt_todel, control->mid)) { #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { SCTP_SOCKET_UNLOCK(so, 1); return; } #endif /* can be delivered right away? */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); } /* EY it wont be queued if it could be delivered directly */ queue_needed = 0; if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); strm->last_mid_delivered++; sctp_mark_non_revokable(asoc, control->sinfo_tsn); sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_LOCKED); TAILQ_FOREACH_SAFE(control, &strm->inqueue, next_instrm, at) { /* all delivered */ nxt_todel = strm->last_mid_delivered + 1; if (SCTP_MID_EQ(asoc->idata_supported, nxt_todel, control->mid) && (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG)) { if (control->on_strm_q == SCTP_ON_ORDERED) { TAILQ_REMOVE(&strm->inqueue, control, next_instrm); if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); #ifdef INVARIANTS } else { panic("Huh control: %p is on_strm_q: %d", control, control->on_strm_q); #endif } control->on_strm_q = 0; strm->last_mid_delivered++; /* * We ignore the return of deliver_data here * since we always can hold the chunk on the * d-queue. And we have a finite number that * can be delivered from the strq. */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); } sctp_mark_non_revokable(asoc, control->sinfo_tsn); sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_LOCKED); continue; } else if (SCTP_MID_EQ(asoc->idata_supported, nxt_todel, control->mid)) { *need_reasm = 1; } break; } #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } if (queue_needed) { /* * Ok, we did not deliver this guy, find the correct place * to put it on the queue. */ if (sctp_place_control_in_stream(strm, asoc, control)) { snprintf(msg, sizeof(msg), "Queue to str MID: %u duplicate", control->mid); sctp_clean_up_control(stcb, control); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); *abort_flag = 1; } } } static void sctp_setup_tail_pointer(struct sctp_queued_to_read *control) { struct mbuf *m, *prev = NULL; struct sctp_tcb *stcb; stcb = control->stcb; control->held_length = 0; control->length = 0; m = control->data; while (m) { if (SCTP_BUF_LEN(m) == 0) { /* Skip mbufs with NO length */ if (prev == NULL) { /* First one */ control->data = sctp_m_free(m); m = control->data; } else { SCTP_BUF_NEXT(prev) = sctp_m_free(m); m = SCTP_BUF_NEXT(prev); } if (m == NULL) { control->tail_mbuf = prev; } continue; } prev = m; atomic_add_int(&control->length, SCTP_BUF_LEN(m)); if (control->on_read_q) { /* * On read queue so we must increment the * SB stuff, we assume caller has done any locks of SB. */ sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m); } m = SCTP_BUF_NEXT(m); } if (prev) { control->tail_mbuf = prev; } } static void sctp_add_to_tail_pointer(struct sctp_queued_to_read *control, struct mbuf *m, uint32_t *added) { struct mbuf *prev=NULL; struct sctp_tcb *stcb; stcb = control->stcb; if (stcb == NULL) { #ifdef INVARIANTS panic("Control broken"); #else return; #endif } if (control->tail_mbuf == NULL) { /* TSNH */ sctp_m_freem(control->data); control->data = m; sctp_setup_tail_pointer(control); return; } control->tail_mbuf->m_next = m; while (m) { if (SCTP_BUF_LEN(m) == 0) { /* Skip mbufs with NO length */ if (prev == NULL) { /* First one */ control->tail_mbuf->m_next = sctp_m_free(m); m = control->tail_mbuf->m_next; } else { SCTP_BUF_NEXT(prev) = sctp_m_free(m); m = SCTP_BUF_NEXT(prev); } if (m == NULL) { control->tail_mbuf = prev; } continue; } prev = m; if (control->on_read_q) { /* * On read queue so we must increment the * SB stuff, we assume caller has done any locks of SB. */ sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m); } *added += SCTP_BUF_LEN(m); atomic_add_int(&control->length, SCTP_BUF_LEN(m)); m = SCTP_BUF_NEXT(m); } if (prev) { control->tail_mbuf = prev; } } static void sctp_build_readq_entry_from_ctl(struct sctp_queued_to_read *nc, struct sctp_queued_to_read *control) { memset(nc, 0, sizeof(struct sctp_queued_to_read)); nc->sinfo_stream = control->sinfo_stream; nc->mid = control->mid; TAILQ_INIT(&nc->reasm); nc->top_fsn = control->top_fsn; nc->mid = control->mid; nc->sinfo_flags = control->sinfo_flags; nc->sinfo_ppid = control->sinfo_ppid; nc->sinfo_context = control->sinfo_context; nc->fsn_included = 0xffffffff; nc->sinfo_tsn = control->sinfo_tsn; nc->sinfo_cumtsn = control->sinfo_cumtsn; nc->sinfo_assoc_id = control->sinfo_assoc_id; nc->whoFrom = control->whoFrom; atomic_add_int(&nc->whoFrom->ref_count, 1); nc->stcb = control->stcb; nc->port_from = control->port_from; } static void sctp_reset_a_control(struct sctp_queued_to_read *control, struct sctp_inpcb *inp, uint32_t tsn) { control->fsn_included = tsn; if (control->on_read_q) { /* * We have to purge it from there, * hopefully this will work :-) */ TAILQ_REMOVE(&inp->read_queue, control, next); control->on_read_q = 0; } } static int sctp_handle_old_unordered_data(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_stream_in *strm, struct sctp_queued_to_read *control, uint32_t pd_point, int inp_read_lock_held) { /* Special handling for the old un-ordered data chunk. * All the chunks/TSN's go to mid 0. So * we have to do the old style watching to see * if we have it all. If you return one, no other * control entries on the un-ordered queue will * be looked at. In theory there should be no others * entries in reality, unless the guy is sending both * unordered NDATA and unordered DATA... */ struct sctp_tmit_chunk *chk, *lchk, *tchk; uint32_t fsn; struct sctp_queued_to_read *nc; int cnt_added; if (control->first_frag_seen == 0) { /* Nothing we can do, we have not seen the first piece yet */ return (1); } /* Collapse any we can */ cnt_added = 0; restart: fsn = control->fsn_included + 1; /* Now what can we add? */ TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, lchk) { if (chk->rec.data.fsn == fsn) { /* Ok lets add it */ sctp_alloc_a_readq(stcb, nc); if (nc == NULL) { break; } memset(nc, 0, sizeof(struct sctp_queued_to_read)); TAILQ_REMOVE(&control->reasm, chk, sctp_next); sctp_add_chk_to_control(control, strm, stcb, asoc, chk, SCTP_READ_LOCK_NOT_HELD); fsn++; cnt_added++; chk = NULL; if (control->end_added) { /* We are done */ if (!TAILQ_EMPTY(&control->reasm)) { /* * Ok we have to move anything left on * the control queue to a new control. */ sctp_build_readq_entry_from_ctl(nc, control); tchk = TAILQ_FIRST(&control->reasm); if (tchk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { TAILQ_REMOVE(&control->reasm, tchk, sctp_next); if (asoc->size_on_reasm_queue >= tchk->send_size) { asoc->size_on_reasm_queue -= tchk->send_size; } else { #ifdef INVARIANTS panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, tchk->send_size); #else asoc->size_on_reasm_queue = 0; #endif } sctp_ucount_decr(asoc->cnt_on_reasm_queue); nc->first_frag_seen = 1; nc->fsn_included = tchk->rec.data.fsn; nc->data = tchk->data; nc->sinfo_ppid = tchk->rec.data.ppid; nc->sinfo_tsn = tchk->rec.data.tsn; sctp_mark_non_revokable(asoc, tchk->rec.data.tsn); tchk->data = NULL; sctp_free_a_chunk(stcb, tchk, SCTP_SO_NOT_LOCKED); sctp_setup_tail_pointer(nc); tchk = TAILQ_FIRST(&control->reasm); } /* Spin the rest onto the queue */ while (tchk) { TAILQ_REMOVE(&control->reasm, tchk, sctp_next); TAILQ_INSERT_TAIL(&nc->reasm, tchk, sctp_next); tchk = TAILQ_FIRST(&control->reasm); } /* Now lets add it to the queue after removing control */ TAILQ_INSERT_TAIL(&strm->uno_inqueue, nc, next_instrm); nc->on_strm_q = SCTP_ON_UNORDERED; if (control->on_strm_q) { TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm); control->on_strm_q = 0; } } if (control->pdapi_started) { strm->pd_api_started = 0; control->pdapi_started = 0; } if (control->on_strm_q) { TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm); control->on_strm_q = 0; SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); } if (control->on_read_q == 0) { sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, inp_read_lock_held, SCTP_SO_NOT_LOCKED); #if defined(__Userspace__) } else { sctp_invoke_recv_callback(stcb->sctp_ep, stcb, control, inp_read_lock_held); #endif } sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); if ((nc->first_frag_seen) && !TAILQ_EMPTY(&nc->reasm)) { /* Switch to the new guy and continue */ control = nc; goto restart; } else { if (nc->on_strm_q == 0) { sctp_free_a_readq(stcb, nc); } } return (1); } else { sctp_free_a_readq(stcb, nc); } } else { /* Can't add more */ break; } } if (cnt_added && strm->pd_api_started) { #if defined(__Userspace__) sctp_invoke_recv_callback(stcb->sctp_ep, stcb, control, SCTP_READ_LOCK_NOT_HELD); #endif sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); } if ((control->length > pd_point) && (strm->pd_api_started == 0)) { strm->pd_api_started = 1; control->pdapi_started = 1; sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, inp_read_lock_held, SCTP_SO_NOT_LOCKED); sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); return (0); } else { return (1); } } static void sctp_inject_old_unordered_data(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_queued_to_read *control, struct sctp_tmit_chunk *chk, int *abort_flag) { struct sctp_tmit_chunk *at; int inserted; /* * Here we need to place the chunk into the control structure * sorted in the correct order. */ if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { /* Its the very first one. */ SCTPDBG(SCTP_DEBUG_XXX, "chunk is a first fsn: %u becomes fsn_included\n", chk->rec.data.fsn); at = TAILQ_FIRST(&control->reasm); if (at && SCTP_TSN_GT(chk->rec.data.fsn, at->rec.data.fsn)) { /* * The first chunk in the reassembly is * a smaller TSN than this one, even though * this has a first, it must be from a subsequent * msg. */ goto place_chunk; } if (control->first_frag_seen) { /* * In old un-ordered we can reassembly on * one control multiple messages. As long * as the next FIRST is greater then the old * first (TSN i.e. FSN wise) */ struct mbuf *tdata; uint32_t tmp; if (SCTP_TSN_GT(chk->rec.data.fsn, control->fsn_included)) { /* Easy way the start of a new guy beyond the lowest */ goto place_chunk; } if ((chk->rec.data.fsn == control->fsn_included) || (control->pdapi_started)) { /* * Ok this should not happen, if it does * we started the pd-api on the higher TSN (since * the equals part is a TSN failure it must be that). * * We are completly hosed in that case since I have * no way to recover. This really will only happen * if we can get more TSN's higher before the pd-api-point. */ sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_4); return; } /* * Ok we have two firsts and the one we just got * is smaller than the one we previously placed.. yuck! * We must swap them out. */ /* swap the mbufs */ tdata = control->data; control->data = chk->data; chk->data = tdata; /* Save the lengths */ chk->send_size = control->length; /* Recompute length of control and tail pointer */ sctp_setup_tail_pointer(control); /* Fix the FSN included */ tmp = control->fsn_included; control->fsn_included = chk->rec.data.fsn; chk->rec.data.fsn = tmp; /* Fix the TSN included */ tmp = control->sinfo_tsn; control->sinfo_tsn = chk->rec.data.tsn; chk->rec.data.tsn = tmp; /* Fix the PPID included */ tmp = control->sinfo_ppid; control->sinfo_ppid = chk->rec.data.ppid; chk->rec.data.ppid = tmp; /* Fix tail pointer */ goto place_chunk; } control->first_frag_seen = 1; control->fsn_included = chk->rec.data.fsn; control->top_fsn = chk->rec.data.fsn; control->sinfo_tsn = chk->rec.data.tsn; control->sinfo_ppid = chk->rec.data.ppid; control->data = chk->data; sctp_mark_non_revokable(asoc, chk->rec.data.tsn); chk->data = NULL; sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); sctp_setup_tail_pointer(control); return; } place_chunk: inserted = 0; TAILQ_FOREACH(at, &control->reasm, sctp_next) { if (SCTP_TSN_GT(at->rec.data.fsn, chk->rec.data.fsn)) { /* * This one in queue is bigger than the new one, insert * the new one before at. */ asoc->size_on_reasm_queue += chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); inserted = 1; TAILQ_INSERT_BEFORE(at, chk, sctp_next); break; } else if (at->rec.data.fsn == chk->rec.data.fsn) { /* * They sent a duplicate fsn number. This * really should not happen since the FSN is * a TSN and it should have been dropped earlier. */ sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_5); return; } } if (inserted == 0) { /* Its at the end */ asoc->size_on_reasm_queue += chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); control->top_fsn = chk->rec.data.fsn; TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next); } } static int sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_stream_in *strm, int inp_read_lock_held) { /* * Given a stream, strm, see if any of * the SSN's on it that are fragmented * are ready to deliver. If so go ahead * and place them on the read queue. In * so placing if we have hit the end, then * we need to remove them from the stream's queue. */ struct sctp_queued_to_read *control, *nctl = NULL; uint32_t next_to_del; uint32_t pd_point; int ret = 0; if (stcb->sctp_socket) { pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, stcb->sctp_ep->partial_delivery_point); } else { pd_point = stcb->sctp_ep->partial_delivery_point; } control = TAILQ_FIRST(&strm->uno_inqueue); if ((control != NULL) && (asoc->idata_supported == 0)) { /* Special handling needed for "old" data format */ if (sctp_handle_old_unordered_data(stcb, asoc, strm, control, pd_point, inp_read_lock_held)) { goto done_un; } } if (strm->pd_api_started) { /* Can't add more */ return (0); } while (control) { SCTPDBG(SCTP_DEBUG_XXX, "Looking at control: %p e(%d) ssn: %u top_fsn: %u inc_fsn: %u -uo\n", control, control->end_added, control->mid, control->top_fsn, control->fsn_included); nctl = TAILQ_NEXT(control, next_instrm); if (control->end_added) { /* We just put the last bit on */ if (control->on_strm_q) { #ifdef INVARIANTS if (control->on_strm_q != SCTP_ON_UNORDERED ) { panic("Huh control: %p on_q: %d -- not unordered?", control, control->on_strm_q); } #endif SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm); control->on_strm_q = 0; } if (control->on_read_q == 0) { sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, inp_read_lock_held, SCTP_SO_NOT_LOCKED); } } else { /* Can we do a PD-API for this un-ordered guy? */ if ((control->length >= pd_point) && (strm->pd_api_started == 0)) { strm->pd_api_started = 1; control->pdapi_started = 1; sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, inp_read_lock_held, SCTP_SO_NOT_LOCKED); break; } } control = nctl; } done_un: control = TAILQ_FIRST(&strm->inqueue); if (strm->pd_api_started) { /* Can't add more */ return (0); } if (control == NULL) { return (ret); } if (SCTP_MID_EQ(asoc->idata_supported, strm->last_mid_delivered, control->mid)) { /* Ok the guy at the top was being partially delivered * completed, so we remove it. Note * the pd_api flag was taken off when the * chunk was merged on in sctp_queue_data_for_reasm below. */ nctl = TAILQ_NEXT(control, next_instrm); SCTPDBG(SCTP_DEBUG_XXX, "Looking at control: %p e(%d) ssn: %u top_fsn: %u inc_fsn: %u (lastdel: %u)- o\n", control, control->end_added, control->mid, control->top_fsn, control->fsn_included, strm->last_mid_delivered); if (control->end_added) { if (control->on_strm_q) { #ifdef INVARIANTS if (control->on_strm_q != SCTP_ON_ORDERED ) { panic("Huh control: %p on_q: %d -- not ordered?", control, control->on_strm_q); } #endif SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); TAILQ_REMOVE(&strm->inqueue, control, next_instrm); if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); control->on_strm_q = 0; } if (strm->pd_api_started && control->pdapi_started) { control->pdapi_started = 0; strm->pd_api_started = 0; } if (control->on_read_q == 0) { sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, inp_read_lock_held, SCTP_SO_NOT_LOCKED); } control = nctl; } } if (strm->pd_api_started) { /* Can't add more must have gotten an un-ordered above being partially delivered. */ return (0); } deliver_more: next_to_del = strm->last_mid_delivered + 1; if (control) { SCTPDBG(SCTP_DEBUG_XXX, "Looking at control: %p e(%d) ssn: %u top_fsn: %u inc_fsn: %u (nxtdel: %u)- o\n", control, control->end_added, control->mid, control->top_fsn, control->fsn_included, next_to_del); nctl = TAILQ_NEXT(control, next_instrm); if (SCTP_MID_EQ(asoc->idata_supported, control->mid, next_to_del) && (control->first_frag_seen)) { int done; /* Ok we can deliver it onto the stream. */ if (control->end_added) { /* We are done with it afterwards */ if (control->on_strm_q) { #ifdef INVARIANTS if (control->on_strm_q != SCTP_ON_ORDERED ) { panic("Huh control: %p on_q: %d -- not ordered?", control, control->on_strm_q); } #endif SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); TAILQ_REMOVE(&strm->inqueue, control, next_instrm); if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); control->on_strm_q = 0; } ret++; } if (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) { /* A singleton now slipping through - mark it non-revokable too */ sctp_mark_non_revokable(asoc, control->sinfo_tsn); } else if (control->end_added == 0) { /* Check if we can defer adding until its all there */ if ((control->length < pd_point) || (strm->pd_api_started)) { /* Don't need it or cannot add more (one being delivered that way) */ goto out; } } done = (control->end_added) && (control->last_frag_seen); if (control->on_read_q == 0) { if (!done) { if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } strm->pd_api_started = 1; control->pdapi_started = 1; } sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, inp_read_lock_held, SCTP_SO_NOT_LOCKED); } strm->last_mid_delivered = next_to_del; if (done) { control = nctl; goto deliver_more; } } } out: return (ret); } uint32_t sctp_add_chk_to_control(struct sctp_queued_to_read *control, struct sctp_stream_in *strm, struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_tmit_chunk *chk, int hold_rlock) { /* * Given a control and a chunk, merge the * data from the chk onto the control and free * up the chunk resources. */ uint32_t added=0; int i_locked = 0; if (control->on_read_q && (hold_rlock == 0)) { /* * Its being pd-api'd so we must * do some locks. */ SCTP_INP_READ_LOCK(stcb->sctp_ep); i_locked = 1; } if (control->data == NULL) { control->data = chk->data; sctp_setup_tail_pointer(control); } else { sctp_add_to_tail_pointer(control, chk->data, &added); } control->fsn_included = chk->rec.data.fsn; asoc->size_on_reasm_queue -= chk->send_size; sctp_ucount_decr(asoc->cnt_on_reasm_queue); sctp_mark_non_revokable(asoc, chk->rec.data.tsn); chk->data = NULL; if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { control->first_frag_seen = 1; control->sinfo_tsn = chk->rec.data.tsn; control->sinfo_ppid = chk->rec.data.ppid; } if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { /* Its complete */ if ((control->on_strm_q) && (control->on_read_q)) { if (control->pdapi_started) { control->pdapi_started = 0; strm->pd_api_started = 0; } if (control->on_strm_q == SCTP_ON_UNORDERED) { /* Unordered */ TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm); control->on_strm_q = 0; } else if (control->on_strm_q == SCTP_ON_ORDERED) { /* Ordered */ TAILQ_REMOVE(&strm->inqueue, control, next_instrm); /* * Don't need to decrement size_on_all_streams, * since control is on the read queue. */ sctp_ucount_decr(asoc->cnt_on_all_streams); control->on_strm_q = 0; #ifdef INVARIANTS } else if (control->on_strm_q) { panic("Unknown state on ctrl: %p on_strm_q: %d", control, control->on_strm_q); #endif } } control->end_added = 1; control->last_frag_seen = 1; } if (i_locked) { SCTP_INP_READ_UNLOCK(stcb->sctp_ep); } sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); return (added); } /* * 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_queued_to_read *control, struct sctp_tmit_chunk *chk, int created_control, int *abort_flag, uint32_t tsn) { uint32_t next_fsn; struct sctp_tmit_chunk *at, *nat; struct sctp_stream_in *strm; int do_wakeup, unordered; uint32_t lenadded; strm = &asoc->strmin[control->sinfo_stream]; /* * For old un-ordered data chunks. */ if ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED) { unordered = 1; } else { unordered = 0; } /* Must be added to the stream-in queue */ if (created_control) { if (unordered == 0) { sctp_ucount_incr(asoc->cnt_on_all_streams); } if (sctp_place_control_in_stream(strm, asoc, control)) { /* Duplicate SSN? */ sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_6); sctp_clean_up_control(stcb, control); return; } if ((tsn == (asoc->cumulative_tsn + 1) && (asoc->idata_supported == 0))) { /* Ok we created this control and now * lets validate that its legal i.e. there * is a B bit set, if not and we have * up to the cum-ack then its invalid. */ if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_7); return; } } } if ((asoc->idata_supported == 0) && (unordered == 1)) { sctp_inject_old_unordered_data(stcb, asoc, control, chk, abort_flag); return; } /* * Ok we must queue the chunk into the reasembly portion: * o if its the first it goes to the control mbuf. * o if its not first but the next in sequence it goes to the control, * and each succeeding one in order also goes. * o if its not in order we place it on the list in its place. */ if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { /* Its the very first one. */ SCTPDBG(SCTP_DEBUG_XXX, "chunk is a first fsn: %u becomes fsn_included\n", chk->rec.data.fsn); if (control->first_frag_seen) { /* * Error on senders part, they either * sent us two data chunks with FIRST, * or they sent two un-ordered chunks that * were fragmented at the same time in the same stream. */ sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_8); return; } control->first_frag_seen = 1; control->sinfo_ppid = chk->rec.data.ppid; control->sinfo_tsn = chk->rec.data.tsn; control->fsn_included = chk->rec.data.fsn; control->data = chk->data; sctp_mark_non_revokable(asoc, chk->rec.data.tsn); chk->data = NULL; sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); sctp_setup_tail_pointer(control); asoc->size_on_all_streams += control->length; } else { /* Place the chunk in our list */ int inserted=0; if (control->last_frag_seen == 0) { /* Still willing to raise highest FSN seen */ if (SCTP_TSN_GT(chk->rec.data.fsn, control->top_fsn)) { SCTPDBG(SCTP_DEBUG_XXX, "We have a new top_fsn: %u\n", chk->rec.data.fsn); control->top_fsn = chk->rec.data.fsn; } if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { SCTPDBG(SCTP_DEBUG_XXX, "The last fsn is now in place fsn: %u\n", chk->rec.data.fsn); control->last_frag_seen = 1; if (SCTP_TSN_GT(control->top_fsn, chk->rec.data.fsn)) { SCTPDBG(SCTP_DEBUG_XXX, "New fsn: %u is not at top_fsn: %u -- abort\n", chk->rec.data.fsn, control->top_fsn); sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_9); return; } } if (asoc->idata_supported || control->first_frag_seen) { /* * For IDATA we always check since we know that * the first fragment is 0. For old DATA we have * to receive the first before we know the first FSN * (which is the TSN). */ if (SCTP_TSN_GE(control->fsn_included, chk->rec.data.fsn)) { /* We have already delivered up to this so its a dup */ sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_10); return; } } } else { if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { /* Second last? huh? */ SCTPDBG(SCTP_DEBUG_XXX, "Duplicate last fsn: %u (top: %u) -- abort\n", chk->rec.data.fsn, control->top_fsn); sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_11); return; } if (asoc->idata_supported || control->first_frag_seen) { /* * For IDATA we always check since we know that * the first fragment is 0. For old DATA we have * to receive the first before we know the first FSN * (which is the TSN). */ if (SCTP_TSN_GE(control->fsn_included, chk->rec.data.fsn)) { /* We have already delivered up to this so its a dup */ SCTPDBG(SCTP_DEBUG_XXX, "New fsn: %u is already seen in included_fsn: %u -- abort\n", chk->rec.data.fsn, control->fsn_included); sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_12); return; } } /* validate not beyond top FSN if we have seen last one */ if (SCTP_TSN_GT(chk->rec.data.fsn, control->top_fsn)) { SCTPDBG(SCTP_DEBUG_XXX, "New fsn: %u is beyond or at top_fsn: %u -- abort\n", chk->rec.data.fsn, control->top_fsn); sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_13); return; } } /* * If we reach here, we need to place the * new chunk in the reassembly for this * control. */ SCTPDBG(SCTP_DEBUG_XXX, "chunk is a not first fsn: %u needs to be inserted\n", chk->rec.data.fsn); TAILQ_FOREACH(at, &control->reasm, sctp_next) { if (SCTP_TSN_GT(at->rec.data.fsn, chk->rec.data.fsn)) { /* * This one in queue is bigger than the new one, insert * the new one before at. */ SCTPDBG(SCTP_DEBUG_XXX, "Insert it before fsn: %u\n", at->rec.data.fsn); asoc->size_on_reasm_queue += chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); TAILQ_INSERT_BEFORE(at, chk, sctp_next); inserted = 1; break; } else if (at->rec.data.fsn == chk->rec.data.fsn) { /* Gak, He sent me a duplicate str seq number */ /* * foo bar, I guess I will just free this new guy, * should we abort too? FIX ME MAYBE? Or it COULD be * that the SSN's have wrapped. Maybe I should * compare to TSN somehow... sigh for now just blow * away the chunk! */ SCTPDBG(SCTP_DEBUG_XXX, "Duplicate to fsn: %u -- abort\n", at->rec.data.fsn); sctp_abort_in_reasm(stcb, control, chk, abort_flag, SCTP_FROM_SCTP_INDATA + SCTP_LOC_14); return; } } if (inserted == 0) { /* Goes on the end */ SCTPDBG(SCTP_DEBUG_XXX, "Inserting at tail of list fsn: %u\n", chk->rec.data.fsn); asoc->size_on_reasm_queue += chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next); } } /* * Ok lets see if we can suck any up into the control * structure that are in seq if it makes sense. */ do_wakeup = 0; /* * If the first fragment has not been * seen there is no sense in looking. */ if (control->first_frag_seen) { next_fsn = control->fsn_included + 1; TAILQ_FOREACH_SAFE(at, &control->reasm, sctp_next, nat) { if (at->rec.data.fsn == next_fsn) { /* We can add this one now to the control */ SCTPDBG(SCTP_DEBUG_XXX, "Adding more to control: %p at: %p fsn: %u next_fsn: %u included: %u\n", control, at, at->rec.data.fsn, next_fsn, control->fsn_included); TAILQ_REMOVE(&control->reasm, at, sctp_next); lenadded = sctp_add_chk_to_control(control, strm, stcb, asoc, at, SCTP_READ_LOCK_NOT_HELD); if (control->on_read_q) { do_wakeup = 1; } else { /* * We only add to the size-on-all-streams * if its not on the read q. The read q * flag will cause a sballoc so its accounted * for there. */ asoc->size_on_all_streams += lenadded; } next_fsn++; if (control->end_added && control->pdapi_started) { if (strm->pd_api_started) { strm->pd_api_started = 0; control->pdapi_started = 0; } if (control->on_read_q == 0) { sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, control->end_added, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); } break; } } else { break; } } } if (do_wakeup) { #if defined(__Userspace__) sctp_invoke_recv_callback(stcb->sctp_ep, stcb, control, SCTP_READ_LOCK_NOT_HELD); #endif /* Need to wakeup the reader */ sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); } } static struct sctp_queued_to_read * sctp_find_reasm_entry(struct sctp_stream_in *strm, uint32_t mid, int ordered, int idata_supported) { struct sctp_queued_to_read *control; if (ordered) { TAILQ_FOREACH(control, &strm->inqueue, next_instrm) { if (SCTP_MID_EQ(idata_supported, control->mid, mid)) { break; } } } else { if (idata_supported) { TAILQ_FOREACH(control, &strm->uno_inqueue, next_instrm) { if (SCTP_MID_EQ(idata_supported, control->mid, mid)) { break; } } } else { control = TAILQ_FIRST(&strm->uno_inqueue); } } return (control); } static int sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, struct mbuf **m, int offset, int chk_length, struct sctp_nets *net, uint32_t *high_tsn, int *abort_flag, int *break_flag, int last_chunk, uint8_t chk_type) { struct sctp_tmit_chunk *chk = NULL; /* make gcc happy */ uint32_t tsn, fsn, gap, mid; struct mbuf *dmbuf; int the_len; int need_reasm_check = 0; uint16_t sid; struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; struct sctp_queued_to_read *control, *ncontrol; uint32_t ppid; uint8_t chk_flags; struct sctp_stream_reset_list *liste; int ordered; size_t clen; int created_control = 0; if (chk_type == SCTP_IDATA) { struct sctp_idata_chunk *chunk, chunk_buf; chunk = (struct sctp_idata_chunk *)sctp_m_getptr(*m, offset, sizeof(struct sctp_idata_chunk), (uint8_t *)&chunk_buf); chk_flags = chunk->ch.chunk_flags; clen = sizeof(struct sctp_idata_chunk); tsn = ntohl(chunk->dp.tsn); sid = ntohs(chunk->dp.sid); mid = ntohl(chunk->dp.mid); if (chk_flags & SCTP_DATA_FIRST_FRAG) { fsn = 0; ppid = chunk->dp.ppid_fsn.ppid; } else { fsn = ntohl(chunk->dp.ppid_fsn.fsn); ppid = 0xffffffff; /* Use as an invalid value. */ } } else { struct sctp_data_chunk *chunk, chunk_buf; chunk = (struct sctp_data_chunk *)sctp_m_getptr(*m, offset, sizeof(struct sctp_data_chunk), (uint8_t *)&chunk_buf); chk_flags = chunk->ch.chunk_flags; clen = sizeof(struct sctp_data_chunk); tsn = ntohl(chunk->dp.tsn); sid = ntohs(chunk->dp.sid); mid = (uint32_t)(ntohs(chunk->dp.ssn)); fsn = tsn; ppid = chunk->dp.ppid; } if ((size_t)chk_length == clen) { /* * Need to send an abort since we had a * empty data chunk. */ op_err = sctp_generate_no_user_data_cause(tsn); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } if ((chk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { asoc->send_sack = 1; } ordered = ((chk_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, chk_type, tsn); if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { /* It is a duplicate */ SCTP_STAT_INCR(sctps_recvdupdata); if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { /* Record a dup for the next outbound sack */ asoc->dup_tsns[asoc->numduptsns] = tsn; asoc->numduptsns++; } asoc->send_sack = 1; return (0); } /* Calculate the number of TSN's between the base and this TSN */ SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); if (gap >= (SCTP_MAPPING_ARRAY << 3)) { /* Can't hold the bit in the mapping at max array, toss it */ return (0); } if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { SCTP_TCB_LOCK_ASSERT(stcb); if (sctp_expand_mapping_array(asoc, gap)) { /* Can't expand, drop it */ return (0); } } if (SCTP_TSN_GT(tsn, *high_tsn)) { *high_tsn = tsn; } /* See if we have received this one already */ if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) || SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) { SCTP_STAT_INCR(sctps_recvdupdata); if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { /* Record a dup for the next outbound sack */ asoc->dup_tsns[asoc->numduptsns] = tsn; asoc->numduptsns++; } asoc->send_sack = 1; return (0); } /* * Check to see about the GONE flag, duplicates would cause a sack * to be sent up above */ if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) { /* * wait a minute, this guy is gone, there is no longer a * receiver. Send peer an ABORT! */ op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } /* * Now before going further we see if there is room. If NOT then we * MAY let one through only IF this TSN is the one we are waiting * for on a partial delivery API. */ /* Is the stream valid? */ if (sid >= asoc->streamincnt) { struct sctp_error_invalid_stream *cause; op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_invalid_stream), 0, M_NOWAIT, 1, MT_DATA); if (op_err != NULL) { /* add some space up front so prepend will work well */ SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); cause = mtod(op_err, struct sctp_error_invalid_stream *); /* * Error causes are just param's and this one has * two back to back phdr, one with the error type * and size, the other with the streamid and a rsvd */ SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_invalid_stream); cause->cause.code = htons(SCTP_CAUSE_INVALID_STREAM); cause->cause.length = htons(sizeof(struct sctp_error_invalid_stream)); cause->stream_id = htons(sid); cause->reserved = htons(0); sctp_queue_op_err(stcb, op_err); } SCTP_STAT_INCR(sctps_badsid); SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { asoc->highest_tsn_inside_nr_map = tsn; } if (tsn == (asoc->cumulative_tsn + 1)) { /* Update cum-ack */ asoc->cumulative_tsn = tsn; } return (0); } /* * If its a fragmented message, lets see if we can * find the control on the reassembly queues. */ if ((chk_type == SCTP_IDATA) && ((chk_flags & SCTP_DATA_FIRST_FRAG) == 0) && (fsn == 0)) { /* * The first *must* be fsn 0, and other * (middle/end) pieces can *not* be fsn 0. * XXX: This can happen in case of a wrap around. * Ignore is for now. */ snprintf(msg, sizeof(msg), "FSN zero for MID=%8.8x, but flags=%2.2x", mid, chk_flags); goto err_out; } control = sctp_find_reasm_entry(&asoc->strmin[sid], mid, ordered, asoc->idata_supported); SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags:0x%x look for control on queues %p\n", chk_flags, control); if ((chk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { /* See if we can find the re-assembly entity */ if (control != NULL) { /* We found something, does it belong? */ if (ordered && (mid != control->mid)) { snprintf(msg, sizeof(msg), "Reassembly problem (MID=%8.8x)", mid); err_out: op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } if (ordered && ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED)) { /* We can't have a switched order with an unordered chunk */ snprintf(msg, sizeof(msg), "All fragments of a user message must be ordered or unordered (TSN=%8.8x)", tsn); goto err_out; } if (!ordered && (((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED) == 0)) { /* We can't have a switched unordered with a ordered chunk */ snprintf(msg, sizeof(msg), "All fragments of a user message must be ordered or unordered (TSN=%8.8x)", tsn); goto err_out; } } } else { /* Its a complete segment. Lets validate we * don't have a re-assembly going on with * the same Stream/Seq (for ordered) or in * the same Stream for unordered. */ if (control != NULL) { if (ordered || asoc->idata_supported) { SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags: 0x%x dup detected on MID: %u\n", chk_flags, mid); snprintf(msg, sizeof(msg), "Duplicate MID=%8.8x detected.", mid); goto err_out; } else { if ((tsn == control->fsn_included + 1) && (control->end_added == 0)) { snprintf(msg, sizeof(msg), "Illegal message sequence, missing end for MID: %8.8x", control->fsn_included); goto err_out; } else { control = NULL; } } } } /* 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 (chk_type == SCTP_DATA) { if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) && SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { /* Nope not in the valid range dump it */ dump_packet: sctp_set_rwnd(stcb, asoc); if ((asoc->cnt_on_all_streams + asoc->cnt_on_reasm_queue + asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { SCTP_STAT_INCR(sctps_datadropchklmt); } else { SCTP_STAT_INCR(sctps_datadroprwnd); } *break_flag = 1; return (0); } } else { if (control == NULL) { goto dump_packet; } if (SCTP_TSN_GT(fsn, control->top_fsn)) { goto dump_packet; } } } #ifdef SCTP_ASOCLOG_OF_TSNS SCTP_TCB_LOCK_ASSERT(stcb); if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { asoc->tsn_in_at = 0; asoc->tsn_in_wrapped = 1; } asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; asoc->in_tsnlog[asoc->tsn_in_at].strm = sid; asoc->in_tsnlog[asoc->tsn_in_at].seq = mid; asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; asoc->tsn_in_at++; #endif /* * Before we continue lets validate that we are not being fooled by * an evil attacker. We can only have Nk chunks based on our TSN * spread allowed by the mapping array N * 8 bits, so there is no * way our stream sequence numbers could have wrapped. We of course * only validate the FIRST fragment so the bit must be set. */ if ((chk_flags & SCTP_DATA_FIRST_FRAG) && (TAILQ_EMPTY(&asoc->resetHead)) && (chk_flags & SCTP_DATA_UNORDERED) == 0 && SCTP_MID_GE(asoc->idata_supported, asoc->strmin[sid].last_mid_delivered, mid)) { /* The incoming sseq is behind where we last delivered? */ SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ: %u delivered: %u from peer, Abort!\n", mid, asoc->strmin[sid].last_mid_delivered); if (asoc->idata_supported) { snprintf(msg, sizeof(msg), "Delivered MID=%8.8x, got TSN=%8.8x, SID=%4.4x, MID=%8.8x", asoc->strmin[sid].last_mid_delivered, tsn, sid, mid); } else { snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", (uint16_t)asoc->strmin[sid].last_mid_delivered, tsn, sid, (uint16_t)mid); } 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; return (0); } if (chk_type == SCTP_IDATA) { the_len = (chk_length - sizeof(struct sctp_idata_chunk)); } else { the_len = (chk_length - sizeof(struct sctp_data_chunk)); } if (last_chunk == 0) { if (chk_type == SCTP_IDATA) { dmbuf = SCTP_M_COPYM(*m, (offset + sizeof(struct sctp_idata_chunk)), the_len, M_NOWAIT); } else { dmbuf = SCTP_M_COPYM(*m, (offset + sizeof(struct sctp_data_chunk)), the_len, M_NOWAIT); } #ifdef SCTP_MBUF_LOGGING if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY); } #endif } else { /* We can steal the last chunk */ int l_len; dmbuf = *m; /* lop off the top part */ if (chk_type == SCTP_IDATA) { m_adj(dmbuf, (offset + sizeof(struct sctp_idata_chunk))); } else { m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); } if (SCTP_BUF_NEXT(dmbuf) == NULL) { l_len = SCTP_BUF_LEN(dmbuf); } else { /* need to count up the size hopefully * does not hit this to often :-0 */ struct mbuf *lat; l_len = 0; for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) { l_len += SCTP_BUF_LEN(lat); } } if (l_len > the_len) { /* Trim the end round bytes off too */ m_adj(dmbuf, -(l_len - the_len)); } } if (dmbuf == NULL) { SCTP_STAT_INCR(sctps_nomem); return (0); } /* * Now no matter what, we need a control, get one * if we don't have one (we may have gotten it * above when we found the message was fragmented */ if (control == NULL) { sctp_alloc_a_readq(stcb, control); sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, ppid, sid, chk_flags, NULL, fsn, mid); if (control == NULL) { SCTP_STAT_INCR(sctps_nomem); return (0); } if ((chk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) { struct mbuf *mm; control->data = dmbuf; control->tail_mbuf = NULL; for (mm = control->data; mm; mm = mm->m_next) { control->length += SCTP_BUF_LEN(mm); if (SCTP_BUF_NEXT(mm) == NULL) { control->tail_mbuf = mm; } } control->end_added = 1; control->last_frag_seen = 1; control->first_frag_seen = 1; control->fsn_included = fsn; control->top_fsn = fsn; } created_control = 1; } SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags: 0x%x ordered: %d MID: %u control: %p\n", chk_flags, ordered, mid, control); if ((chk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && TAILQ_EMPTY(&asoc->resetHead) && ((ordered == 0) || (SCTP_MID_EQ(asoc->idata_supported, asoc->strmin[sid].last_mid_delivered + 1, mid) && TAILQ_EMPTY(&asoc->strmin[sid].inqueue)))) { /* Candidate for express delivery */ /* * Its not fragmented, No PD-API is up, Nothing in the * delivery queue, Its un-ordered OR ordered and the next to * deliver AND nothing else is stuck on the stream queue, * And there is room for it in the socket buffer. Lets just * stuff it up the buffer.... */ SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { asoc->highest_tsn_inside_nr_map = tsn; } SCTPDBG(SCTP_DEBUG_XXX, "Injecting control: %p to be read (MID: %u)\n", control, mid); 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 ((chk_flags & SCTP_DATA_UNORDERED) == 0) { /* for ordered, bump what we delivered */ asoc->strmin[sid].last_mid_delivered++; } SCTP_STAT_INCR(sctps_recvexpress); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del_alt(stcb, tsn, mid, sid, SCTP_STR_LOG_FROM_EXPRS_DEL); } control = NULL; goto finish_express_del; } /* Now will we need a chunk too? */ if ((chk_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 = tsn; chk->no_fr_allowed = 0; chk->rec.data.fsn = fsn; chk->rec.data.mid = mid; chk->rec.data.sid = sid; chk->rec.data.ppid = ppid; chk->rec.data.context = stcb->asoc.context; chk->rec.data.doing_fast_retransmit = 0; chk->rec.data.rcv_flags = chk_flags; chk->asoc = asoc; chk->send_size = the_len; chk->whoTo = net; SCTPDBG(SCTP_DEBUG_XXX, "Building ck: %p for control: %p to be read (MID: %u)\n", chk, control, mid); atomic_add_int(&net->ref_count, 1); chk->data = dmbuf; } /* Set the appropriate TSN mark */ if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { asoc->highest_tsn_inside_nr_map = tsn; } } else { SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) { asoc->highest_tsn_inside_map = tsn; } } /* Now is it complete (i.e. not fragmented)? */ if ((chk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) { /* * Special check for when streams are resetting. We * could be more smart about this and check the * actual stream to see if it is not being reset.. * that way we would not create a HOLB when amongst * streams being reset and those not being reset. * */ if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && SCTP_TSN_GT(tsn, liste->tsn)) { /* * yep its past where we need to reset... go * ahead and queue it. */ if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { /* first one on */ TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); } else { struct sctp_queued_to_read *lcontrol, *nlcontrol; unsigned char inserted = 0; TAILQ_FOREACH_SAFE(lcontrol, &asoc->pending_reply_queue, next, nlcontrol) { if (SCTP_TSN_GT(control->sinfo_tsn, lcontrol->sinfo_tsn)) { continue; } else { /* found it */ TAILQ_INSERT_BEFORE(lcontrol, control, next); inserted = 1; break; } } if (inserted == 0) { /* * must be put at end, use * prevP (all setup from * loop) to setup nextP. */ TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); } } goto finish_express_del; } if (chk_flags & SCTP_DATA_UNORDERED) { /* queue directly into socket buffer */ SCTPDBG(SCTP_DEBUG_XXX, "Unordered data to be read control: %p MID: %u\n", control, mid); sctp_mark_non_revokable(asoc, control->sinfo_tsn); sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); } else { SCTPDBG(SCTP_DEBUG_XXX, "Queue control: %p for reordering MID: %u\n", control, mid); sctp_queue_data_to_stream(stcb, asoc, control, abort_flag, &need_reasm_check); if (*abort_flag) { if (last_chunk) { *m = NULL; } return (0); } } goto finish_express_del; } /* If we reach here its a reassembly */ need_reasm_check = 1; SCTPDBG(SCTP_DEBUG_XXX, "Queue data to stream for reasm control: %p MID: %u\n", control, mid); sctp_queue_data_for_reasm(stcb, asoc, control, chk, created_control, abort_flag, tsn); if (*abort_flag) { /* * the assoc is now gone and chk was put onto the * reasm queue, which has all been freed. */ if (last_chunk) { *m = NULL; } return (0); } finish_express_del: /* Here we tidy up things */ if (tsn == (asoc->cumulative_tsn + 1)) { /* Update cum-ack */ asoc->cumulative_tsn = tsn; } if (last_chunk) { *m = NULL; } if (ordered) { SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); } else { SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); } SCTP_STAT_INCR(sctps_recvdata); /* Set it present please */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del_alt(stcb, tsn, mid, sid, 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); } if (need_reasm_check) { (void)sctp_deliver_reasm_check(stcb, asoc, &asoc->strmin[sid], SCTP_READ_LOCK_NOT_HELD); need_reasm_check = 0; } /* 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. */ sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams); TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); sctp_send_deferred_reset_response(stcb, liste, SCTP_STREAM_RESET_RESULT_PERFORMED); SCTP_FREE(liste, SCTP_M_STRESET); /*sa_ignore FREED_MEMORY*/ liste = TAILQ_FIRST(&asoc->resetHead); if (TAILQ_EMPTY(&asoc->resetHead)) { /* All can be removed */ TAILQ_FOREACH_SAFE(control, &asoc->pending_reply_queue, next, ncontrol) { TAILQ_REMOVE(&asoc->pending_reply_queue, control, next); sctp_queue_data_to_stream(stcb, asoc, control, abort_flag, &need_reasm_check); if (*abort_flag) { return (0); } if (need_reasm_check) { (void)sctp_deliver_reasm_check(stcb, asoc, &asoc->strmin[control->sinfo_stream], SCTP_READ_LOCK_NOT_HELD); need_reasm_check = 0; } } } else { TAILQ_FOREACH_SAFE(control, &asoc->pending_reply_queue, next, ncontrol) { if (SCTP_TSN_GT(control->sinfo_tsn, liste->tsn)) { break; } /* * if control->sinfo_tsn is <= liste->tsn we can * process it which is the NOT of * control->sinfo_tsn > liste->tsn */ TAILQ_REMOVE(&asoc->pending_reply_queue, control, next); sctp_queue_data_to_stream(stcb, asoc, control, abort_flag, &need_reasm_check); if (*abort_flag) { return (0); } if (need_reasm_check) { (void)sctp_deliver_reasm_check(stcb, asoc, &asoc->strmin[control->sinfo_stream], SCTP_READ_LOCK_NOT_HELD); need_reasm_check = 0; } } } } return (1); } static const int8_t sctp_map_lookup_tab[256] = { 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 8 }; void sctp_slide_mapping_arrays(struct sctp_tcb *stcb) { /* * Now we also need to check the mapping array in a couple of ways. * 1) Did we move the cum-ack point? * * When you first glance at this you might think * that all entries that make up the position * 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; int is_a_gap; sctp_slide_mapping_arrays(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; } /* Is there a gap now? */ is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); /* * Now we need to see if we need to queue a sack or just start the * timer (if allowed). */ if (SCTP_GET_STATE(stcb) == 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)); if (is_a_gap) { sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); } } else { /* * 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. */ sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_19); sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); } } else { if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { sctp_timer_start(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL); } } } } int sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t *high_tsn) { struct sctp_chunkhdr *ch, chunk_buf; struct sctp_association *asoc; int num_chunks = 0; /* number of control chunks processed */ int stop_proc = 0; int break_flag, last_chunk; int abort_flag = 0, was_a_gap; struct mbuf *m; uint32_t highest_tsn; uint16_t chk_length; /* 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); /* success, 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_chunkhdr *)sctp_m_getptr(m, *offset, sizeof(struct sctp_chunkhdr), (uint8_t *)&chunk_buf); if (ch == NULL) { return (1); } /* * process all DATA chunks... */ *high_tsn = asoc->cumulative_tsn; break_flag = 0; asoc->data_pkts_seen++; while (stop_proc == 0) { /* validate chunk length */ chk_length = ntohs(ch->chunk_length); if (length - *offset < chk_length) { /* all done, mutulated chunk */ stop_proc = 1; continue; } if ((asoc->idata_supported == 1) && (ch->chunk_type == SCTP_DATA)) { struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; snprintf(msg, sizeof(msg), "%s", "I-DATA chunk received when DATA was negotiated"); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_20; sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); return (2); } if ((asoc->idata_supported == 0) && (ch->chunk_type == SCTP_IDATA)) { struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; snprintf(msg, sizeof(msg), "%s", "DATA chunk received when I-DATA was negotiated"); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_21; sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); return (2); } if ((ch->chunk_type == SCTP_DATA) || (ch->chunk_type == SCTP_IDATA)) { uint16_t clen; if (ch->chunk_type == SCTP_DATA) { clen = sizeof(struct sctp_data_chunk); } else { clen = sizeof(struct sctp_idata_chunk); } if (chk_length < clen) { /* * Need to send an abort since we had a * invalid data chunk. */ struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; snprintf(msg, sizeof(msg), "%s chunk of length %u", ch->chunk_type == SCTP_DATA ? "DATA" : "I-DATA", chk_length); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_22; sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); return (2); } #ifdef SCTP_AUDITING_ENABLED sctp_audit_log(0xB1, 0); #endif if (SCTP_SIZE32(chk_length) == (length - *offset)) { last_chunk = 1; } else { last_chunk = 0; } if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, chk_length, net, high_tsn, &abort_flag, &break_flag, last_chunk, ch->chunk_type)) { num_chunks++; } if (abort_flag) return (2); if (break_flag) { /* * Set because of out of rwnd space and no * drop rep space left. */ stop_proc = 1; continue; } } else { /* not a data chunk in the data region */ switch (ch->chunk_type) { case SCTP_INITIATION: case SCTP_INITIATION_ACK: case SCTP_SELECTIVE_ACK: case SCTP_NR_SELECTIVE_ACK: case SCTP_HEARTBEAT_REQUEST: case SCTP_HEARTBEAT_ACK: case SCTP_ABORT_ASSOCIATION: case SCTP_SHUTDOWN: case SCTP_SHUTDOWN_ACK: case SCTP_OPERATION_ERROR: case SCTP_COOKIE_ECHO: case SCTP_COOKIE_ACK: case SCTP_ECN_ECHO: case SCTP_ECN_CWR: case SCTP_SHUTDOWN_COMPLETE: case SCTP_AUTHENTICATION: case SCTP_ASCONF_ACK: case SCTP_PACKET_DROPPED: case SCTP_STREAM_RESET: case SCTP_FORWARD_CUM_TSN: case SCTP_ASCONF: { /* * Now, what do we do with KNOWN chunks that * are NOT in the right place? * * For now, I do nothing but ignore them. We * may later want to add sysctl stuff to * switch out and do either an ABORT() or * possibly process them. */ struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; snprintf(msg, sizeof(msg), "DATA chunk followed by chunk of type %2.2x", ch->chunk_type); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); return (2); } default: /* * Unknown chunk type: use bit rules after * checking length */ if (chk_length < sizeof(struct sctp_chunkhdr)) { /* * Need to send an abort since we had a * invalid chunk. */ struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; snprintf(msg, sizeof(msg), "Chunk of length %u", chk_length); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_23; sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); return (2); } if (ch->chunk_type & 0x40) { /* Add a error report to the queue */ struct mbuf *op_err; struct sctp_gen_error_cause *cause; op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 0, M_NOWAIT, 1, MT_DATA); if (op_err != NULL) { cause = mtod(op_err, struct sctp_gen_error_cause *); cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); cause->length = htons((uint16_t)(chk_length + sizeof(struct sctp_gen_error_cause))); SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); if (SCTP_BUF_NEXT(op_err) != NULL) { sctp_queue_op_err(stcb, op_err); } else { sctp_m_freem(op_err); } } } if ((ch->chunk_type & 0x80) == 0) { /* discard the rest of this packet */ stop_proc = 1; } /* else skip this bad chunk and * continue... */ break; } /* switch of chunk type */ } *offset += SCTP_SIZE32(chk_length); if ((*offset >= length) || stop_proc) { /* no more data left in the mbuf chain */ stop_proc = 1; continue; } ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, sizeof(struct sctp_chunkhdr), (uint8_t *)&chunk_buf); if (ch == NULL) { *offset = length; stop_proc = 1; continue; } } if (break_flag) { /* * we need to report rwnd overrun drops. */ sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0); } if (num_chunks) { /* * Did we get data, if so update the time for auto-close and * give peer credit for being alive. */ SCTP_STAT_INCR(sctps_recvpktwithdata); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); } /* now service all of the reassm queue if needed */ if (SCTP_GET_STATE(stcb) == 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; 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; tp1->whoTo->find_rtx_pseudo_cumack = 0; } if (tp1->rec.data.tsn == 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, *biggest_newly_acked_tsn)) { *biggest_newly_acked_tsn = tp1->rec.data.tsn; } /*- * 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, tp1->whoTo->this_sack_highest_newack)) { tp1->whoTo->this_sack_highest_newack = tp1->rec.data.tsn; } /*- * 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, 0, 0, SCTP_LOG_TSN_ACKED); } *this_sack_lowest_newack = tp1->rec.data.tsn; } /*- * 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 == 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, SCTP_CWND_LOG_FROM_SACK); } if (tp1->rec.data.tsn == 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, frag_strt, frag_end, SCTP_LOG_TSN_ACKED); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, tp1->whoTo->flight_size, tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } 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-retransmitted chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /*- * update RTO too ? */ if (tp1->do_rtt) { if (*rto_ok && sctp_calculate_rto(stcb, &stcb->asoc, tp1->whoTo, &tp1->sent_rcv_time, 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, stcb->asoc.this_sack_highest_gap)) { stcb->asoc.this_sack_highest_gap = tp1->rec.data.tsn; } 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.sid].chunks_on_queues > 0) { stcb->asoc.strmout[tp1->rec.data.sid].chunks_on_queues--; #ifdef INVARIANTS } else { panic("No chunks on the queues for sid %u.", tp1->rec.data.sid); #endif } if ((stcb->asoc.strmout[tp1->rec.data.sid].chunks_on_queues == 0) && (stcb->asoc.strmout[tp1->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) && TAILQ_EMPTY(&stcb->asoc.strmout[tp1->rec.data.sid].outqueue)) { stcb->asoc.trigger_reset = 1; } tp1->sent = SCTP_DATAGRAM_NR_ACKED; if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1); sctp_m_freem(tp1->data); tp1->data = NULL; } wake_him++; } } break; } /* if (tp1->tsn == theTSN) */ if (SCTP_TSN_GT(tp1->rec.data.tsn, 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, 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, biggest_tsn_acked)) { break; } if (tp1->sent == SCTP_DATAGRAM_ACKED) { /* it has been revoked */ tp1->sent = SCTP_DATAGRAM_SENT; tp1->rec.data.chunk_was_revoked = 1; /* We must add this stuff back in to * assure timers and such get started. */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, tp1->whoTo->flight_size, tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } 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, 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; } /* 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, tp1->sent, SCTP_FR_LOG_CHECK_STRIKE); } if (SCTP_TSN_GT(tp1->rec.data.tsn, 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, asoc->this_sack_highest_gap) && !(accum_moved && asoc->fast_retran_loss_recovery)) { /* 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, tp1->whoTo->this_sack_highest_newack) && !(accum_moved && asoc->fast_retran_loss_recovery)) { /* * 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, 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)) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(16 + num_dests_sacked, tp1->rec.data.tsn, 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, 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)) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(32 + num_dests_sacked, tp1->rec.data.tsn, 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, 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, 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)) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(48 + num_dests_sacked, tp1->rec.data.tsn, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } tp1->sent++; } } } if (tp1->sent == SCTP_DATAGRAM_RESEND) { struct sctp_nets *alt; /* fix counts and things */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } 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 */ if (tp1->whoTo != NULL) { 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, 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); */ 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; } 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, 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, asoc->advanced_peer_ack_point)) { asoc->advanced_peer_ack_point = tp1->rec.data.tsn; a_adv = tp1; } else if (tp1->rec.data.tsn == asoc->advanced_peer_ack_point) { /* No update but we do save the chk */ a_adv = tp1; } } else { /* * If it is still in RESEND we can advance no * further */ break; } } return (a_adv); } static int sctp_fs_audit(struct sctp_association *asoc) { struct sctp_tmit_chunk *chk; int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; int ret; #ifndef INVARIANTS int entry_flight, entry_cnt; #endif ret = 0; #ifndef INVARIANTS entry_flight = asoc->total_flight; entry_cnt = asoc->total_flight_count; #endif if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) return (0); TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { if (chk->sent < SCTP_DATAGRAM_RESEND) { SCTP_PRINTF("Chk TSN: %u size: %d inflight cnt: %d\n", chk->rec.data.tsn, chk->send_size, chk->snd_count); inflight++; } else if (chk->sent == SCTP_DATAGRAM_RESEND) { resend++; } else if (chk->sent < SCTP_DATAGRAM_ACKED) { inbetween++; } else if (chk->sent > SCTP_DATAGRAM_ACKED) { above++; } else { acked++; } } if ((inflight > 0) || (inbetween > 0)) { #ifdef INVARIANTS panic("Flight size-express incorrect? \n"); #else SCTP_PRINTF("asoc->total_flight: %d cnt: %d\n", entry_flight, entry_cnt); SCTP_PRINTF("Flight size-express incorrect F: %d I: %d R: %d Ab: %d ACK: %d\n", inflight, inbetween, resend, above, acked); ret = 1; #endif } return (ret); } static void sctp_window_probe_recovery(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_tmit_chunk *tp1) { tp1->window_probe = 0; if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { /* TSN's skipped we do NOT move back. */ sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, tp1->whoTo ? tp1->whoTo->flight_size : 0, tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); return; } /* First setup this by shrinking flight */ if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo, tp1); } sctp_flight_size_decrease(tp1); sctp_total_flight_decrease(stcb, tp1); /* Now mark for resend */ tp1->sent = SCTP_DATAGRAM_RESEND; sctp_ucount_incr(asoc->sent_queue_retran_cnt); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, tp1->whoTo->flight_size, tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } } 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; uint32_t send_s; 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 (!TAILQ_EMPTY(&asoc->sent_queue)) { tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead); send_s = tp1->rec.data.tsn + 1; } else { send_s = asoc->sending_seq; } if (SCTP_TSN_GE(cumack, send_s)) { struct mbuf *op_err; char msg[SCTP_DIAG_INFO_LEN]; *abort_now = 1; /* XXX */ snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x", cumack, send_s); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); return; } asoc->this_sack_highest_gap = cumack; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) { /* process the new consecutive TSN first */ TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { if (SCTP_TSN_GE(cumack, tp1->rec.data.tsn)) { if (tp1->sent == SCTP_DATAGRAM_UNSENT) { SCTP_PRINTF("Warning, an unsent is now acked?\n"); } if (tp1->sent < SCTP_DATAGRAM_ACKED) { /* * If it is less than ACKED, it is * now no-longer in flight. Higher * values may occur during marking */ if (tp1->sent < SCTP_DATAGRAM_RESEND) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, tp1->whoTo->flight_size, tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } 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-retransmitted * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* update RTO too? */ if (tp1->do_rtt) { if (rto_ok && sctp_calculate_rto(stcb, &stcb->asoc, tp1->whoTo, &tp1->sent_rcv_time, 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, 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.sid].chunks_on_queues > 0) { asoc->strmout[tp1->rec.data.sid].chunks_on_queues--; #ifdef INVARIANTS } else { panic("No chunks on the queues for sid %u.", tp1->rec.data.sid); #endif } } if ((asoc->strmout[tp1->rec.data.sid].chunks_on_queues == 0) && (asoc->strmout[tp1->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) && TAILQ_EMPTY(&asoc->strmout[tp1->rec.data.sid].outqueue)) { asoc->trigger_reset = 1; } TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); tp1->data = NULL; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cumack, tp1->rec.data.tsn, 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_INDATA + SCTP_LOC_25); 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) { 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->flight_size) { j++; 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 */ net->window_probe = 0; 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_26); } } } 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) || (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) && ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete)(stcb, asoc))) { SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT); } if (((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) && (asoc->stream_queue_cnt == 1) && (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) { struct mbuf *op_err; *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_27; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); return; } if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && (asoc->stream_queue_cnt == 0)) { struct sctp_nets *netp; if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { SCTP_STAT_DECR_GAUGE32(sctps_currestab); } SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT); 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, NULL); } else if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) && (asoc->stream_queue_cnt == 0)) { struct sctp_nets *netp; SCTP_STAT_DECR_GAUGE32(sctps_currestab); SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 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); } } /* reality check */ if (!TAILQ_EMPTY(&asoc->sent_queue)) { tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead); send_s = tp1->rec.data.tsn + 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, (void *)tp1); } hopeless_peer: *abort_now = 1; /* XXX */ snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x", cum_ack, send_s); op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_28; 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_29); 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); } /* * 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. */ net->saw_newack = 0; net->this_sack_highest_newack = last_tsn; } /* process the new consecutive TSN first */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (SCTP_TSN_GE(last_tsn, tp1->rec.data.tsn)) { if (tp1->sent != SCTP_DATAGRAM_UNSENT) { accum_moved = 1; if (tp1->sent < SCTP_DATAGRAM_ACKED) { /* * If it is less than ACKED, it is * now no-longer in flight. Higher * values may occur during marking */ if ((tp1->whoTo->dest_state & SCTP_ADDR_UNCONFIRMED) && (tp1->snd_count < 2)) { /* * If there was no retran * and the address is * un-confirmed and we sent * there and are now * sacked.. its confirmed, * mark it so. */ tp1->whoTo->dest_state &= ~SCTP_ADDR_UNCONFIRMED; } if (tp1->sent < SCTP_DATAGRAM_RESEND) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, tp1->whoTo->flight_size, tp1->book_size, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } 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; tp1->whoTo->saw_newack = 1; if (tp1->snd_count < 2) { /* * True non-retransmitted * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* update RTO too? */ if (tp1->do_rtt) { if (rto_ok && sctp_calculate_rto(stcb, &stcb->asoc, tp1->whoTo, &tp1->sent_rcv_time, 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, 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, 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)) { /* * 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++; } /* * 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_30); } } 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_31); } } } /********************************************/ /* 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, cum_ack)) { break; } if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { if (asoc->strmout[tp1->rec.data.sid].chunks_on_queues > 0) { asoc->strmout[tp1->rec.data.sid].chunks_on_queues--; #ifdef INVARIANTS } else { panic("No chunks on the queues for sid %u.", tp1->rec.data.sid); #endif } } if ((asoc->strmout[tp1->rec.data.sid].chunks_on_queues == 0) && (asoc->strmout[tp1->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) && TAILQ_EMPTY(&asoc->strmout[tp1->rec.data.sid].outqueue)) { asoc->trigger_reset = 1; } TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); if (PR_SCTP_ENABLED(tp1->flags)) { if (asoc->pr_sctp_cnt != 0) asoc->pr_sctp_cnt--; } asoc->sent_queue_cnt--; if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); tp1->data = NULL; if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) { asoc->sent_queue_cnt_removeable--; } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, tp1->rec.data.tsn, 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 positive 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, (uint32_t)(uintptr_t)tp1->whoTo, tp1->rec.data.tsn); } sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); tp1->rec.data.chunk_was_revoked = 1; /* * To ensure that this increase in * flightsize, which is artificial, * does not throttle the sender, we * also increase the cwnd * artificially. */ tp1->whoTo->cwnd += tp1->book_size; cnt_revoked++; } } if (cnt_revoked) { reneged_all = 1; } asoc->saw_sack_with_frags = 0; } if (num_nr_seg > 0) asoc->saw_sack_with_nr_frags = 1; else asoc->saw_sack_with_nr_frags = 0; /* JRS - Use the congestion control given in the CC module */ if (ecne_seen == 0) { TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (net->net_ack2 > 0) { /* * Karn's rule applies to clearing error count, this * is optional. */ net->error_count = 0; if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { /* addr came good */ net->dest_state |= SCTP_ADDR_REACHABLE; sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED); } if (net == stcb->asoc.primary_destination) { if (stcb->asoc.alternate) { /* release the alternate, primary is good */ sctp_free_remote_addr(stcb->asoc.alternate); stcb->asoc.alternate = NULL; } } if (net->dest_state & SCTP_ADDR_PF) { net->dest_state &= ~SCTP_ADDR_PF; sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32); 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_33); 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) || (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) && ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete)(stcb, asoc))) { SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT); } if (((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) && (asoc->stream_queue_cnt == 1) && (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) { struct mbuf *op_err; *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_34; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); return; } if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && (asoc->stream_queue_cnt == 0)) { struct sctp_nets *netp; if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { SCTP_STAT_DECR_GAUGE32(sctps_currestab); } SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT); 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, NULL); return; } else if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) && (asoc->stream_queue_cnt == 0)) { struct sctp_nets *netp; SCTP_STAT_DECR_GAUGE32(sctps_currestab); SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 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_35); } } } 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 *control, *ncontrol; struct sctp_association *asoc; uint32_t mid; int need_reasm_check = 0; asoc = &stcb->asoc; mid = strmin->last_mid_delivered; /* * First deliver anything prior to and including the stream no that * came in. */ TAILQ_FOREACH_SAFE(control, &strmin->inqueue, next_instrm, ncontrol) { if (SCTP_MID_GE(asoc->idata_supported, mid, control->mid)) { /* this is deliverable now */ if (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) { if (control->on_strm_q) { if (control->on_strm_q == SCTP_ON_ORDERED) { TAILQ_REMOVE(&strmin->inqueue, control, next_instrm); } else if (control->on_strm_q == SCTP_ON_UNORDERED) { TAILQ_REMOVE(&strmin->uno_inqueue, control, next_instrm); #ifdef INVARIANTS } else { panic("strmin: %p ctl: %p unknown %d", strmin, control, control->on_strm_q); #endif } control->on_strm_q = 0; } /* subtract pending on streams */ if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); /* deliver it to at least the delivery-q */ if (stcb->sctp_socket) { 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_HELD, SCTP_SO_NOT_LOCKED); } } else { /* Its a fragmented message */ if (control->first_frag_seen) { /* Make it so this is next to deliver, we restore later */ strmin->last_mid_delivered = control->mid - 1; need_reasm_check = 1; break; } } } else { /* no more delivery now. */ break; } } if (need_reasm_check) { int ret; ret = sctp_deliver_reasm_check(stcb, &stcb->asoc, strmin, SCTP_READ_LOCK_HELD); if (SCTP_MID_GT(asoc->idata_supported, mid, strmin->last_mid_delivered)) { /* Restore the next to deliver unless we are ahead */ strmin->last_mid_delivered = mid; } if (ret == 0) { /* Left the front Partial one on */ return; } need_reasm_check = 0; } /* * now we must deliver things in queue the normal way if any are * now ready. */ mid = strmin->last_mid_delivered + 1; TAILQ_FOREACH_SAFE(control, &strmin->inqueue, next_instrm, ncontrol) { if (SCTP_MID_EQ(asoc->idata_supported, mid, control->mid)) { if (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) { /* this is deliverable now */ if (control->on_strm_q) { if (control->on_strm_q == SCTP_ON_ORDERED) { TAILQ_REMOVE(&strmin->inqueue, control, next_instrm); } else if (control->on_strm_q == SCTP_ON_UNORDERED) { TAILQ_REMOVE(&strmin->uno_inqueue, control, next_instrm); #ifdef INVARIANTS } else { panic("strmin: %p ctl: %p unknown %d", strmin, control, control->on_strm_q); #endif } control->on_strm_q = 0; } /* subtract pending on streams */ if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); /* deliver it to at least the delivery-q */ strmin->last_mid_delivered = control->mid; if (stcb->sctp_socket) { 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_HELD, SCTP_SO_NOT_LOCKED); } mid = strmin->last_mid_delivered + 1; } else { /* Its a fragmented message */ if (control->first_frag_seen) { /* Make it so this is next to deliver */ strmin->last_mid_delivered = control->mid - 1; need_reasm_check = 1; break; } } } else { break; } } if (need_reasm_check) { (void)sctp_deliver_reasm_check(stcb, &stcb->asoc, strmin, SCTP_READ_LOCK_HELD); } } static void sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, struct sctp_association *asoc, uint16_t stream, uint32_t mid, int ordered, uint32_t cumtsn) { struct sctp_queued_to_read *control; struct sctp_stream_in *strm; struct sctp_tmit_chunk *chk, *nchk; int cnt_removed=0; /* * For now large messages held on the stream reasm that are * complete will be tossed too. We could in theory do more * work to spin through and stop after dumping one msg aka * seeing the start of a new msg at the head, and call the * delivery function... to see if it can be delivered... But * for now we just dump everything on the queue. */ strm = &asoc->strmin[stream]; control = sctp_find_reasm_entry(strm, mid, ordered, asoc->idata_supported); if (control == NULL) { /* Not found */ return; } if (!asoc->idata_supported && !ordered && SCTP_TSN_GT(control->fsn_included, cumtsn)) { return; } TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) { /* Purge hanging chunks */ if (!asoc->idata_supported && (ordered == 0)) { if (SCTP_TSN_GT(chk->rec.data.tsn, cumtsn)) { break; } } cnt_removed++; TAILQ_REMOVE(&control->reasm, chk, sctp_next); if (asoc->size_on_reasm_queue >= chk->send_size) { asoc->size_on_reasm_queue -= chk->send_size; } else { #ifdef INVARIANTS panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, chk->send_size); #else asoc->size_on_reasm_queue = 0; #endif } sctp_ucount_decr(asoc->cnt_on_reasm_queue); if (chk->data) { sctp_m_freem(chk->data); chk->data = NULL; } sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); } if (!TAILQ_EMPTY(&control->reasm)) { /* This has to be old data, unordered */ if (control->data) { sctp_m_freem(control->data); control->data = NULL; } sctp_reset_a_control(control, stcb->sctp_ep, cumtsn); chk = TAILQ_FIRST(&control->reasm); if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { TAILQ_REMOVE(&control->reasm, chk, sctp_next); sctp_add_chk_to_control(control, strm, stcb, asoc, chk, SCTP_READ_LOCK_HELD); } sctp_deliver_reasm_check(stcb, asoc, strm, SCTP_READ_LOCK_HELD); return; } if (control->on_strm_q == SCTP_ON_ORDERED) { TAILQ_REMOVE(&strm->inqueue, control, next_instrm); if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); control->on_strm_q = 0; } else if (control->on_strm_q == SCTP_ON_UNORDERED) { TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm); control->on_strm_q = 0; #ifdef INVARIANTS } else if (control->on_strm_q) { panic("strm: %p ctl: %p unknown %d", strm, control, control->on_strm_q); #endif } control->on_strm_q = 0; if (control->on_read_q == 0) { sctp_free_remote_addr(control->whoFrom); if (control->data) { sctp_m_freem(control->data); control->data = NULL; } sctp_free_a_readq(stcb, control); } } void sctp_handle_forward_tsn(struct sctp_tcb *stcb, struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m , int offset) { /* The pr-sctp fwd tsn */ /* * here we will perform all the data receiver side steps for * processing FwdTSN, as required in by pr-sctp draft: * * Assume we get FwdTSN(x): * * 1) update local cumTSN to x * 2) try to further advance cumTSN to x + others we have * 3) examine and update re-ordering queue on pr-in-streams * 4) clean up re-assembly queue * 5) Send a sack to report where we are. */ struct sctp_association *asoc; uint32_t new_cum_tsn, gap; unsigned int i, fwd_sz, m_size; uint32_t str_seq; struct sctp_stream_in *strm; struct sctp_queued_to_read *control, *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_36; sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); return; } SCTP_STAT_INCR(sctps_fwdtsn_map_over); memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); asoc->mapping_array_base_tsn = new_cum_tsn + 1; asoc->highest_tsn_inside_map = new_cum_tsn; memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); asoc->highest_tsn_inside_nr_map = new_cum_tsn; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } } else { SCTP_TCB_LOCK_ASSERT(stcb); for (i = 0; i <= gap; i++) { if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) && !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) { SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) { asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i; } } } } /*************************************************************/ /* 2. Clear up re-assembly queue */ /*************************************************************/ /* This is now done as part of clearing up the stream/seq */ if (asoc->idata_supported == 0) { uint16_t sid; /* Flush all the un-ordered data based on cum-tsn */ SCTP_INP_READ_LOCK(stcb->sctp_ep); for (sid = 0 ; sid < asoc->streamincnt; sid++) { sctp_flush_reassm_for_str_seq(stcb, asoc, sid, 0, 0, new_cum_tsn); } SCTP_INP_READ_UNLOCK(stcb->sctp_ep); } /*******************************************************/ /* 3. Update the PR-stream re-ordering queues and fix */ /* delivery issues as needed. */ /*******************************************************/ fwd_sz -= sizeof(*fwd); if (m && fwd_sz) { /* New method. */ unsigned int num_str; uint32_t mid, cur_mid; uint16_t sid; uint16_t ordered, flags; struct sctp_strseq *stseq, strseqbuf; struct sctp_strseq_mid *stseq_m, strseqbuf_m; offset += sizeof(*fwd); SCTP_INP_READ_LOCK(stcb->sctp_ep); if (asoc->idata_supported) { num_str = fwd_sz / sizeof(struct sctp_strseq_mid); } else { num_str = fwd_sz / sizeof(struct sctp_strseq); } for (i = 0; i < num_str; i++) { if (asoc->idata_supported) { stseq_m = (struct sctp_strseq_mid *)sctp_m_getptr(m, offset, sizeof(struct sctp_strseq_mid), (uint8_t *)&strseqbuf_m); offset += sizeof(struct sctp_strseq_mid); if (stseq_m == NULL) { break; } sid = ntohs(stseq_m->sid); mid = ntohl(stseq_m->mid); flags = ntohs(stseq_m->flags); if (flags & PR_SCTP_UNORDERED_FLAG) { ordered = 0; } else { ordered = 1; } } else { stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, sizeof(struct sctp_strseq), (uint8_t *)&strseqbuf); offset += sizeof(struct sctp_strseq); if (stseq == NULL) { break; } sid = ntohs(stseq->sid); mid = (uint32_t)ntohs(stseq->ssn); ordered = 1; } /* Convert */ /* now process */ /* * Ok we now look for the stream/seq on the read queue * where its not all delivered. If we find it we transmute the * read entry into a PDI_ABORTED. */ if (sid >= asoc->streamincnt) { /* screwed up streams, stop! */ break; } if ((asoc->str_of_pdapi == sid) && (asoc->ssn_of_pdapi == mid)) { /* If this is the one we were partially delivering * now then we no longer are. Note this will change * with the reassembly re-write. */ asoc->fragmented_delivery_inprogress = 0; } strm = &asoc->strmin[sid]; for (cur_mid = strm->last_mid_delivered; SCTP_MID_GE(asoc->idata_supported, mid, cur_mid); cur_mid++) { sctp_flush_reassm_for_str_seq(stcb, asoc, sid, cur_mid, ordered, new_cum_tsn); } TAILQ_FOREACH(control, &stcb->sctp_ep->read_queue, next) { if ((control->sinfo_stream == sid) && (SCTP_MID_EQ(asoc->idata_supported, control->mid, mid))) { str_seq = (sid << 16) | (0x0000ffff & mid); control->pdapi_aborted = 1; sv = stcb->asoc.control_pdapi; control->end_added = 1; if (control->on_strm_q == SCTP_ON_ORDERED) { TAILQ_REMOVE(&strm->inqueue, control, next_instrm); if (asoc->size_on_all_streams >= control->length) { asoc->size_on_all_streams -= control->length; } else { #ifdef INVARIANTS panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length); #else asoc->size_on_all_streams = 0; #endif } sctp_ucount_decr(asoc->cnt_on_all_streams); } else if (control->on_strm_q == SCTP_ON_UNORDERED) { TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm); #ifdef INVARIANTS } else if (control->on_strm_q) { panic("strm: %p ctl: %p unknown %d", strm, control, control->on_strm_q); #endif } control->on_strm_q = 0; stcb->asoc.control_pdapi = control; 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 ((control->sinfo_stream == sid) && SCTP_MID_GT(asoc->idata_supported, control->mid, mid)) { /* We are past our victim SSN */ break; } } if (SCTP_MID_GT(asoc->idata_supported, mid, strm->last_mid_delivered)) { /* Update the sequence number */ strm->last_mid_delivered = mid; } /* 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); }