1361 строка
32 KiB
C
1361 строка
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* SCTP kernel implementation
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* (C) Copyright Red Hat Inc. 2017
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*
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* This file is part of the SCTP kernel implementation
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*
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* These functions implement sctp stream message interleaving, mostly
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* including I-DATA and I-FORWARD-TSN chunks process.
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*
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* Please send any bug reports or fixes you make to the
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* email addresched(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Xin Long <lucien.xin@gmail.com>
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*/
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#include <net/busy_poll.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#include <net/sctp/ulpevent.h>
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#include <linux/sctp.h>
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static struct sctp_chunk *sctp_make_idatafrag_empty(
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const struct sctp_association *asoc,
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const struct sctp_sndrcvinfo *sinfo,
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int len, __u8 flags, gfp_t gfp)
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{
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struct sctp_chunk *retval;
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struct sctp_idatahdr dp;
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memset(&dp, 0, sizeof(dp));
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dp.stream = htons(sinfo->sinfo_stream);
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if (sinfo->sinfo_flags & SCTP_UNORDERED)
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flags |= SCTP_DATA_UNORDERED;
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retval = sctp_make_idata(asoc, flags, sizeof(dp) + len, gfp);
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if (!retval)
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return NULL;
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retval->subh.idata_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
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memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
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return retval;
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}
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static void sctp_chunk_assign_mid(struct sctp_chunk *chunk)
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{
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struct sctp_stream *stream;
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struct sctp_chunk *lchunk;
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__u32 cfsn = 0;
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__u16 sid;
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if (chunk->has_mid)
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return;
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sid = sctp_chunk_stream_no(chunk);
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stream = &chunk->asoc->stream;
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list_for_each_entry(lchunk, &chunk->msg->chunks, frag_list) {
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struct sctp_idatahdr *hdr;
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__u32 mid;
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lchunk->has_mid = 1;
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hdr = lchunk->subh.idata_hdr;
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if (lchunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG)
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hdr->ppid = lchunk->sinfo.sinfo_ppid;
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else
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hdr->fsn = htonl(cfsn++);
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if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
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mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ?
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sctp_mid_uo_next(stream, out, sid) :
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sctp_mid_uo_peek(stream, out, sid);
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} else {
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mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ?
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sctp_mid_next(stream, out, sid) :
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sctp_mid_peek(stream, out, sid);
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}
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hdr->mid = htonl(mid);
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}
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}
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static bool sctp_validate_data(struct sctp_chunk *chunk)
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{
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struct sctp_stream *stream;
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__u16 sid, ssn;
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if (chunk->chunk_hdr->type != SCTP_CID_DATA)
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return false;
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if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
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return true;
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stream = &chunk->asoc->stream;
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sid = sctp_chunk_stream_no(chunk);
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ssn = ntohs(chunk->subh.data_hdr->ssn);
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return !SSN_lt(ssn, sctp_ssn_peek(stream, in, sid));
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}
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static bool sctp_validate_idata(struct sctp_chunk *chunk)
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{
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struct sctp_stream *stream;
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__u32 mid;
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__u16 sid;
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if (chunk->chunk_hdr->type != SCTP_CID_I_DATA)
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return false;
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if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
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return true;
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stream = &chunk->asoc->stream;
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sid = sctp_chunk_stream_no(chunk);
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mid = ntohl(chunk->subh.idata_hdr->mid);
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return !MID_lt(mid, sctp_mid_peek(stream, in, sid));
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}
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static void sctp_intl_store_reasm(struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sctp_ulpevent *cevent;
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struct sk_buff *pos, *loc;
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pos = skb_peek_tail(&ulpq->reasm);
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if (!pos) {
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__skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
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return;
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}
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cevent = sctp_skb2event(pos);
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if (event->stream == cevent->stream &&
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event->mid == cevent->mid &&
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(cevent->msg_flags & SCTP_DATA_FIRST_FRAG ||
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(!(event->msg_flags & SCTP_DATA_FIRST_FRAG) &&
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event->fsn > cevent->fsn))) {
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__skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
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return;
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}
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if ((event->stream == cevent->stream &&
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MID_lt(cevent->mid, event->mid)) ||
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event->stream > cevent->stream) {
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__skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
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return;
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}
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loc = NULL;
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skb_queue_walk(&ulpq->reasm, pos) {
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cevent = sctp_skb2event(pos);
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if (event->stream < cevent->stream ||
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(event->stream == cevent->stream &&
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MID_lt(event->mid, cevent->mid))) {
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loc = pos;
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break;
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}
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if (event->stream == cevent->stream &&
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event->mid == cevent->mid &&
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!(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) &&
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(event->msg_flags & SCTP_DATA_FIRST_FRAG ||
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event->fsn < cevent->fsn)) {
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loc = pos;
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break;
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}
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}
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if (!loc)
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__skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
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else
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__skb_queue_before(&ulpq->reasm, loc, sctp_event2skb(event));
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}
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static struct sctp_ulpevent *sctp_intl_retrieve_partial(
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struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sk_buff *first_frag = NULL;
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struct sk_buff *last_frag = NULL;
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struct sctp_ulpevent *retval;
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struct sctp_stream_in *sin;
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struct sk_buff *pos;
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__u32 next_fsn = 0;
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int is_last = 0;
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sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
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skb_queue_walk(&ulpq->reasm, pos) {
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struct sctp_ulpevent *cevent = sctp_skb2event(pos);
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if (cevent->stream < event->stream)
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continue;
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if (cevent->stream > event->stream ||
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cevent->mid != sin->mid)
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break;
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switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
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case SCTP_DATA_FIRST_FRAG:
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goto out;
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case SCTP_DATA_MIDDLE_FRAG:
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if (!first_frag) {
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if (cevent->fsn == sin->fsn) {
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first_frag = pos;
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last_frag = pos;
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next_fsn = cevent->fsn + 1;
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}
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} else if (cevent->fsn == next_fsn) {
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last_frag = pos;
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next_fsn++;
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} else {
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goto out;
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}
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break;
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case SCTP_DATA_LAST_FRAG:
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if (!first_frag) {
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if (cevent->fsn == sin->fsn) {
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first_frag = pos;
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last_frag = pos;
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next_fsn = 0;
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is_last = 1;
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}
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} else if (cevent->fsn == next_fsn) {
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last_frag = pos;
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next_fsn = 0;
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is_last = 1;
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}
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goto out;
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default:
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goto out;
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}
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}
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out:
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if (!first_frag)
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return NULL;
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retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
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first_frag, last_frag);
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if (retval) {
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sin->fsn = next_fsn;
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if (is_last) {
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retval->msg_flags |= MSG_EOR;
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sin->pd_mode = 0;
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}
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}
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return retval;
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}
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static struct sctp_ulpevent *sctp_intl_retrieve_reassembled(
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struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sctp_association *asoc = ulpq->asoc;
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struct sk_buff *pos, *first_frag = NULL;
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struct sctp_ulpevent *retval = NULL;
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struct sk_buff *pd_first = NULL;
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struct sk_buff *pd_last = NULL;
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struct sctp_stream_in *sin;
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__u32 next_fsn = 0;
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__u32 pd_point = 0;
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__u32 pd_len = 0;
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__u32 mid = 0;
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sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
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skb_queue_walk(&ulpq->reasm, pos) {
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struct sctp_ulpevent *cevent = sctp_skb2event(pos);
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if (cevent->stream < event->stream)
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continue;
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if (cevent->stream > event->stream)
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break;
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if (MID_lt(cevent->mid, event->mid))
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continue;
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if (MID_lt(event->mid, cevent->mid))
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break;
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switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
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case SCTP_DATA_FIRST_FRAG:
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if (cevent->mid == sin->mid) {
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pd_first = pos;
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pd_last = pos;
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pd_len = pos->len;
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}
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first_frag = pos;
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next_fsn = 0;
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mid = cevent->mid;
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break;
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case SCTP_DATA_MIDDLE_FRAG:
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if (first_frag && cevent->mid == mid &&
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cevent->fsn == next_fsn) {
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next_fsn++;
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if (pd_first) {
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pd_last = pos;
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pd_len += pos->len;
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}
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} else {
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first_frag = NULL;
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}
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break;
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case SCTP_DATA_LAST_FRAG:
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if (first_frag && cevent->mid == mid &&
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cevent->fsn == next_fsn)
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goto found;
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else
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first_frag = NULL;
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break;
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}
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}
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if (!pd_first)
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goto out;
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pd_point = sctp_sk(asoc->base.sk)->pd_point;
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if (pd_point && pd_point <= pd_len) {
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retval = sctp_make_reassembled_event(asoc->base.net,
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&ulpq->reasm,
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pd_first, pd_last);
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if (retval) {
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sin->fsn = next_fsn;
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sin->pd_mode = 1;
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}
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}
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goto out;
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found:
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retval = sctp_make_reassembled_event(asoc->base.net, &ulpq->reasm,
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first_frag, pos);
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if (retval)
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retval->msg_flags |= MSG_EOR;
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out:
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return retval;
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}
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static struct sctp_ulpevent *sctp_intl_reasm(struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sctp_ulpevent *retval = NULL;
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struct sctp_stream_in *sin;
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if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
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event->msg_flags |= MSG_EOR;
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return event;
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}
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sctp_intl_store_reasm(ulpq, event);
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sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
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if (sin->pd_mode && event->mid == sin->mid &&
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event->fsn == sin->fsn)
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retval = sctp_intl_retrieve_partial(ulpq, event);
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if (!retval)
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retval = sctp_intl_retrieve_reassembled(ulpq, event);
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return retval;
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}
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static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sctp_ulpevent *cevent;
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struct sk_buff *pos, *loc;
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pos = skb_peek_tail(&ulpq->lobby);
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if (!pos) {
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__skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
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return;
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}
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cevent = (struct sctp_ulpevent *)pos->cb;
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if (event->stream == cevent->stream &&
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MID_lt(cevent->mid, event->mid)) {
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__skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
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return;
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}
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if (event->stream > cevent->stream) {
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__skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
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return;
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}
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loc = NULL;
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skb_queue_walk(&ulpq->lobby, pos) {
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cevent = (struct sctp_ulpevent *)pos->cb;
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if (cevent->stream > event->stream) {
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loc = pos;
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break;
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}
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if (cevent->stream == event->stream &&
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MID_lt(event->mid, cevent->mid)) {
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loc = pos;
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break;
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}
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}
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if (!loc)
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__skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
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else
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__skb_queue_before(&ulpq->lobby, loc, sctp_event2skb(event));
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}
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static void sctp_intl_retrieve_ordered(struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sk_buff_head *event_list;
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struct sctp_stream *stream;
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struct sk_buff *pos, *tmp;
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__u16 sid = event->stream;
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stream = &ulpq->asoc->stream;
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event_list = (struct sk_buff_head *)sctp_event2skb(event)->prev;
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sctp_skb_for_each(pos, &ulpq->lobby, tmp) {
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struct sctp_ulpevent *cevent = (struct sctp_ulpevent *)pos->cb;
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if (cevent->stream > sid)
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break;
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if (cevent->stream < sid)
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continue;
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if (cevent->mid != sctp_mid_peek(stream, in, sid))
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break;
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sctp_mid_next(stream, in, sid);
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__skb_unlink(pos, &ulpq->lobby);
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__skb_queue_tail(event_list, pos);
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}
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}
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static struct sctp_ulpevent *sctp_intl_order(struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sctp_stream *stream;
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__u16 sid;
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stream = &ulpq->asoc->stream;
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sid = event->stream;
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if (event->mid != sctp_mid_peek(stream, in, sid)) {
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sctp_intl_store_ordered(ulpq, event);
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return NULL;
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}
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sctp_mid_next(stream, in, sid);
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sctp_intl_retrieve_ordered(ulpq, event);
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return event;
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}
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static int sctp_enqueue_event(struct sctp_ulpq *ulpq,
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struct sk_buff_head *skb_list)
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{
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struct sock *sk = ulpq->asoc->base.sk;
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struct sctp_sock *sp = sctp_sk(sk);
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struct sctp_ulpevent *event;
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struct sk_buff *skb;
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skb = __skb_peek(skb_list);
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event = sctp_skb2event(skb);
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if (sk->sk_shutdown & RCV_SHUTDOWN &&
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(sk->sk_shutdown & SEND_SHUTDOWN ||
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!sctp_ulpevent_is_notification(event)))
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goto out_free;
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if (!sctp_ulpevent_is_notification(event)) {
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sk_mark_napi_id(sk, skb);
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sk_incoming_cpu_update(sk);
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}
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if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe))
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goto out_free;
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if (skb_list)
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skb_queue_splice_tail_init(skb_list,
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&sk->sk_receive_queue);
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else
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__skb_queue_tail(&sk->sk_receive_queue, skb);
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if (!sp->data_ready_signalled) {
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sp->data_ready_signalled = 1;
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sk->sk_data_ready(sk);
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}
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return 1;
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out_free:
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if (skb_list)
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sctp_queue_purge_ulpevents(skb_list);
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else
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sctp_ulpevent_free(event);
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return 0;
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}
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static void sctp_intl_store_reasm_uo(struct sctp_ulpq *ulpq,
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struct sctp_ulpevent *event)
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{
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struct sctp_ulpevent *cevent;
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struct sk_buff *pos;
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|
|
pos = skb_peek_tail(&ulpq->reasm_uo);
|
|
if (!pos) {
|
|
__skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
|
|
return;
|
|
}
|
|
|
|
cevent = sctp_skb2event(pos);
|
|
|
|
if (event->stream == cevent->stream &&
|
|
event->mid == cevent->mid &&
|
|
(cevent->msg_flags & SCTP_DATA_FIRST_FRAG ||
|
|
(!(event->msg_flags & SCTP_DATA_FIRST_FRAG) &&
|
|
event->fsn > cevent->fsn))) {
|
|
__skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
|
|
return;
|
|
}
|
|
|
|
if ((event->stream == cevent->stream &&
|
|
MID_lt(cevent->mid, event->mid)) ||
|
|
event->stream > cevent->stream) {
|
|
__skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
|
|
return;
|
|
}
|
|
|
|
skb_queue_walk(&ulpq->reasm_uo, pos) {
|
|
cevent = sctp_skb2event(pos);
|
|
|
|
if (event->stream < cevent->stream ||
|
|
(event->stream == cevent->stream &&
|
|
MID_lt(event->mid, cevent->mid)))
|
|
break;
|
|
|
|
if (event->stream == cevent->stream &&
|
|
event->mid == cevent->mid &&
|
|
!(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) &&
|
|
(event->msg_flags & SCTP_DATA_FIRST_FRAG ||
|
|
event->fsn < cevent->fsn))
|
|
break;
|
|
}
|
|
|
|
__skb_queue_before(&ulpq->reasm_uo, pos, sctp_event2skb(event));
|
|
}
|
|
|
|
static struct sctp_ulpevent *sctp_intl_retrieve_partial_uo(
|
|
struct sctp_ulpq *ulpq,
|
|
struct sctp_ulpevent *event)
|
|
{
|
|
struct sk_buff *first_frag = NULL;
|
|
struct sk_buff *last_frag = NULL;
|
|
struct sctp_ulpevent *retval;
|
|
struct sctp_stream_in *sin;
|
|
struct sk_buff *pos;
|
|
__u32 next_fsn = 0;
|
|
int is_last = 0;
|
|
|
|
sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
|
|
|
|
skb_queue_walk(&ulpq->reasm_uo, pos) {
|
|
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
|
|
|
|
if (cevent->stream < event->stream)
|
|
continue;
|
|
if (cevent->stream > event->stream)
|
|
break;
|
|
|
|
if (MID_lt(cevent->mid, sin->mid_uo))
|
|
continue;
|
|
if (MID_lt(sin->mid_uo, cevent->mid))
|
|
break;
|
|
|
|
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
|
|
case SCTP_DATA_FIRST_FRAG:
|
|
goto out;
|
|
case SCTP_DATA_MIDDLE_FRAG:
|
|
if (!first_frag) {
|
|
if (cevent->fsn == sin->fsn_uo) {
|
|
first_frag = pos;
|
|
last_frag = pos;
|
|
next_fsn = cevent->fsn + 1;
|
|
}
|
|
} else if (cevent->fsn == next_fsn) {
|
|
last_frag = pos;
|
|
next_fsn++;
|
|
} else {
|
|
goto out;
|
|
}
|
|
break;
|
|
case SCTP_DATA_LAST_FRAG:
|
|
if (!first_frag) {
|
|
if (cevent->fsn == sin->fsn_uo) {
|
|
first_frag = pos;
|
|
last_frag = pos;
|
|
next_fsn = 0;
|
|
is_last = 1;
|
|
}
|
|
} else if (cevent->fsn == next_fsn) {
|
|
last_frag = pos;
|
|
next_fsn = 0;
|
|
is_last = 1;
|
|
}
|
|
goto out;
|
|
default:
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (!first_frag)
|
|
return NULL;
|
|
|
|
retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
|
|
&ulpq->reasm_uo, first_frag,
|
|
last_frag);
|
|
if (retval) {
|
|
sin->fsn_uo = next_fsn;
|
|
if (is_last) {
|
|
retval->msg_flags |= MSG_EOR;
|
|
sin->pd_mode_uo = 0;
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo(
|
|
struct sctp_ulpq *ulpq,
|
|
struct sctp_ulpevent *event)
|
|
{
|
|
struct sctp_association *asoc = ulpq->asoc;
|
|
struct sk_buff *pos, *first_frag = NULL;
|
|
struct sctp_ulpevent *retval = NULL;
|
|
struct sk_buff *pd_first = NULL;
|
|
struct sk_buff *pd_last = NULL;
|
|
struct sctp_stream_in *sin;
|
|
__u32 next_fsn = 0;
|
|
__u32 pd_point = 0;
|
|
__u32 pd_len = 0;
|
|
__u32 mid = 0;
|
|
|
|
sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
|
|
|
|
skb_queue_walk(&ulpq->reasm_uo, pos) {
|
|
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
|
|
|
|
if (cevent->stream < event->stream)
|
|
continue;
|
|
if (cevent->stream > event->stream)
|
|
break;
|
|
|
|
if (MID_lt(cevent->mid, event->mid))
|
|
continue;
|
|
if (MID_lt(event->mid, cevent->mid))
|
|
break;
|
|
|
|
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
|
|
case SCTP_DATA_FIRST_FRAG:
|
|
if (!sin->pd_mode_uo) {
|
|
sin->mid_uo = cevent->mid;
|
|
pd_first = pos;
|
|
pd_last = pos;
|
|
pd_len = pos->len;
|
|
}
|
|
|
|
first_frag = pos;
|
|
next_fsn = 0;
|
|
mid = cevent->mid;
|
|
break;
|
|
|
|
case SCTP_DATA_MIDDLE_FRAG:
|
|
if (first_frag && cevent->mid == mid &&
|
|
cevent->fsn == next_fsn) {
|
|
next_fsn++;
|
|
if (pd_first) {
|
|
pd_last = pos;
|
|
pd_len += pos->len;
|
|
}
|
|
} else {
|
|
first_frag = NULL;
|
|
}
|
|
break;
|
|
|
|
case SCTP_DATA_LAST_FRAG:
|
|
if (first_frag && cevent->mid == mid &&
|
|
cevent->fsn == next_fsn)
|
|
goto found;
|
|
else
|
|
first_frag = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!pd_first)
|
|
goto out;
|
|
|
|
pd_point = sctp_sk(asoc->base.sk)->pd_point;
|
|
if (pd_point && pd_point <= pd_len) {
|
|
retval = sctp_make_reassembled_event(asoc->base.net,
|
|
&ulpq->reasm_uo,
|
|
pd_first, pd_last);
|
|
if (retval) {
|
|
sin->fsn_uo = next_fsn;
|
|
sin->pd_mode_uo = 1;
|
|
}
|
|
}
|
|
goto out;
|
|
|
|
found:
|
|
retval = sctp_make_reassembled_event(asoc->base.net, &ulpq->reasm_uo,
|
|
first_frag, pos);
|
|
if (retval)
|
|
retval->msg_flags |= MSG_EOR;
|
|
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static struct sctp_ulpevent *sctp_intl_reasm_uo(struct sctp_ulpq *ulpq,
|
|
struct sctp_ulpevent *event)
|
|
{
|
|
struct sctp_ulpevent *retval = NULL;
|
|
struct sctp_stream_in *sin;
|
|
|
|
if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
|
|
event->msg_flags |= MSG_EOR;
|
|
return event;
|
|
}
|
|
|
|
sctp_intl_store_reasm_uo(ulpq, event);
|
|
|
|
sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
|
|
if (sin->pd_mode_uo && event->mid == sin->mid_uo &&
|
|
event->fsn == sin->fsn_uo)
|
|
retval = sctp_intl_retrieve_partial_uo(ulpq, event);
|
|
|
|
if (!retval)
|
|
retval = sctp_intl_retrieve_reassembled_uo(ulpq, event);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct sctp_ulpevent *sctp_intl_retrieve_first_uo(struct sctp_ulpq *ulpq)
|
|
{
|
|
struct sctp_stream_in *csin, *sin = NULL;
|
|
struct sk_buff *first_frag = NULL;
|
|
struct sk_buff *last_frag = NULL;
|
|
struct sctp_ulpevent *retval;
|
|
struct sk_buff *pos;
|
|
__u32 next_fsn = 0;
|
|
__u16 sid = 0;
|
|
|
|
skb_queue_walk(&ulpq->reasm_uo, pos) {
|
|
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
|
|
|
|
csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream);
|
|
if (csin->pd_mode_uo)
|
|
continue;
|
|
|
|
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
|
|
case SCTP_DATA_FIRST_FRAG:
|
|
if (first_frag)
|
|
goto out;
|
|
first_frag = pos;
|
|
last_frag = pos;
|
|
next_fsn = 0;
|
|
sin = csin;
|
|
sid = cevent->stream;
|
|
sin->mid_uo = cevent->mid;
|
|
break;
|
|
case SCTP_DATA_MIDDLE_FRAG:
|
|
if (!first_frag)
|
|
break;
|
|
if (cevent->stream == sid &&
|
|
cevent->mid == sin->mid_uo &&
|
|
cevent->fsn == next_fsn) {
|
|
next_fsn++;
|
|
last_frag = pos;
|
|
} else {
|
|
goto out;
|
|
}
|
|
break;
|
|
case SCTP_DATA_LAST_FRAG:
|
|
if (first_frag)
|
|
goto out;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!first_frag)
|
|
return NULL;
|
|
|
|
out:
|
|
retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
|
|
&ulpq->reasm_uo, first_frag,
|
|
last_frag);
|
|
if (retval) {
|
|
sin->fsn_uo = next_fsn;
|
|
sin->pd_mode_uo = 1;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq,
|
|
struct sctp_chunk *chunk, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff_head temp;
|
|
int event_eor = 0;
|
|
|
|
event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp);
|
|
if (!event)
|
|
return -ENOMEM;
|
|
|
|
event->mid = ntohl(chunk->subh.idata_hdr->mid);
|
|
if (event->msg_flags & SCTP_DATA_FIRST_FRAG)
|
|
event->ppid = chunk->subh.idata_hdr->ppid;
|
|
else
|
|
event->fsn = ntohl(chunk->subh.idata_hdr->fsn);
|
|
|
|
if (!(event->msg_flags & SCTP_DATA_UNORDERED)) {
|
|
event = sctp_intl_reasm(ulpq, event);
|
|
if (event) {
|
|
skb_queue_head_init(&temp);
|
|
__skb_queue_tail(&temp, sctp_event2skb(event));
|
|
|
|
if (event->msg_flags & MSG_EOR)
|
|
event = sctp_intl_order(ulpq, event);
|
|
}
|
|
} else {
|
|
event = sctp_intl_reasm_uo(ulpq, event);
|
|
if (event) {
|
|
skb_queue_head_init(&temp);
|
|
__skb_queue_tail(&temp, sctp_event2skb(event));
|
|
}
|
|
}
|
|
|
|
if (event) {
|
|
event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
|
|
sctp_enqueue_event(ulpq, &temp);
|
|
}
|
|
|
|
return event_eor;
|
|
}
|
|
|
|
static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq)
|
|
{
|
|
struct sctp_stream_in *csin, *sin = NULL;
|
|
struct sk_buff *first_frag = NULL;
|
|
struct sk_buff *last_frag = NULL;
|
|
struct sctp_ulpevent *retval;
|
|
struct sk_buff *pos;
|
|
__u32 next_fsn = 0;
|
|
__u16 sid = 0;
|
|
|
|
skb_queue_walk(&ulpq->reasm, pos) {
|
|
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
|
|
|
|
csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream);
|
|
if (csin->pd_mode)
|
|
continue;
|
|
|
|
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
|
|
case SCTP_DATA_FIRST_FRAG:
|
|
if (first_frag)
|
|
goto out;
|
|
if (cevent->mid == csin->mid) {
|
|
first_frag = pos;
|
|
last_frag = pos;
|
|
next_fsn = 0;
|
|
sin = csin;
|
|
sid = cevent->stream;
|
|
}
|
|
break;
|
|
case SCTP_DATA_MIDDLE_FRAG:
|
|
if (!first_frag)
|
|
break;
|
|
if (cevent->stream == sid &&
|
|
cevent->mid == sin->mid &&
|
|
cevent->fsn == next_fsn) {
|
|
next_fsn++;
|
|
last_frag = pos;
|
|
} else {
|
|
goto out;
|
|
}
|
|
break;
|
|
case SCTP_DATA_LAST_FRAG:
|
|
if (first_frag)
|
|
goto out;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!first_frag)
|
|
return NULL;
|
|
|
|
out:
|
|
retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
|
|
&ulpq->reasm, first_frag,
|
|
last_frag);
|
|
if (retval) {
|
|
sin->fsn = next_fsn;
|
|
sin->pd_mode = 1;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff_head temp;
|
|
|
|
if (!skb_queue_empty(&ulpq->reasm)) {
|
|
do {
|
|
event = sctp_intl_retrieve_first(ulpq);
|
|
if (event) {
|
|
skb_queue_head_init(&temp);
|
|
__skb_queue_tail(&temp, sctp_event2skb(event));
|
|
sctp_enqueue_event(ulpq, &temp);
|
|
}
|
|
} while (event);
|
|
}
|
|
|
|
if (!skb_queue_empty(&ulpq->reasm_uo)) {
|
|
do {
|
|
event = sctp_intl_retrieve_first_uo(ulpq);
|
|
if (event) {
|
|
skb_queue_head_init(&temp);
|
|
__skb_queue_tail(&temp, sctp_event2skb(event));
|
|
sctp_enqueue_event(ulpq, &temp);
|
|
}
|
|
} while (event);
|
|
}
|
|
}
|
|
|
|
static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
|
|
gfp_t gfp)
|
|
{
|
|
struct sctp_association *asoc = ulpq->asoc;
|
|
__u32 freed = 0;
|
|
__u16 needed;
|
|
|
|
needed = ntohs(chunk->chunk_hdr->length) -
|
|
sizeof(struct sctp_idata_chunk);
|
|
|
|
if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
|
|
freed = sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
|
|
if (freed < needed)
|
|
freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm,
|
|
needed);
|
|
if (freed < needed)
|
|
freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm_uo,
|
|
needed);
|
|
}
|
|
|
|
if (freed >= needed && sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0)
|
|
sctp_intl_start_pd(ulpq, gfp);
|
|
|
|
sk_mem_reclaim(asoc->base.sk);
|
|
}
|
|
|
|
static void sctp_intl_stream_abort_pd(struct sctp_ulpq *ulpq, __u16 sid,
|
|
__u32 mid, __u16 flags, gfp_t gfp)
|
|
{
|
|
struct sock *sk = ulpq->asoc->base.sk;
|
|
struct sctp_ulpevent *ev = NULL;
|
|
|
|
if (!sctp_ulpevent_type_enabled(ulpq->asoc->subscribe,
|
|
SCTP_PARTIAL_DELIVERY_EVENT))
|
|
return;
|
|
|
|
ev = sctp_ulpevent_make_pdapi(ulpq->asoc, SCTP_PARTIAL_DELIVERY_ABORTED,
|
|
sid, mid, flags, gfp);
|
|
if (ev) {
|
|
struct sctp_sock *sp = sctp_sk(sk);
|
|
|
|
__skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev));
|
|
|
|
if (!sp->data_ready_signalled) {
|
|
sp->data_ready_signalled = 1;
|
|
sk->sk_data_ready(sk);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void sctp_intl_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
|
|
{
|
|
struct sctp_stream *stream = &ulpq->asoc->stream;
|
|
struct sctp_ulpevent *cevent, *event = NULL;
|
|
struct sk_buff_head *lobby = &ulpq->lobby;
|
|
struct sk_buff *pos, *tmp;
|
|
struct sk_buff_head temp;
|
|
__u16 csid;
|
|
__u32 cmid;
|
|
|
|
skb_queue_head_init(&temp);
|
|
sctp_skb_for_each(pos, lobby, tmp) {
|
|
cevent = (struct sctp_ulpevent *)pos->cb;
|
|
csid = cevent->stream;
|
|
cmid = cevent->mid;
|
|
|
|
if (csid > sid)
|
|
break;
|
|
|
|
if (csid < sid)
|
|
continue;
|
|
|
|
if (!MID_lt(cmid, sctp_mid_peek(stream, in, csid)))
|
|
break;
|
|
|
|
__skb_unlink(pos, lobby);
|
|
if (!event)
|
|
event = sctp_skb2event(pos);
|
|
|
|
__skb_queue_tail(&temp, pos);
|
|
}
|
|
|
|
if (!event && pos != (struct sk_buff *)lobby) {
|
|
cevent = (struct sctp_ulpevent *)pos->cb;
|
|
csid = cevent->stream;
|
|
cmid = cevent->mid;
|
|
|
|
if (csid == sid && cmid == sctp_mid_peek(stream, in, csid)) {
|
|
sctp_mid_next(stream, in, csid);
|
|
__skb_unlink(pos, lobby);
|
|
__skb_queue_tail(&temp, pos);
|
|
event = sctp_skb2event(pos);
|
|
}
|
|
}
|
|
|
|
if (event) {
|
|
sctp_intl_retrieve_ordered(ulpq, event);
|
|
sctp_enqueue_event(ulpq, &temp);
|
|
}
|
|
}
|
|
|
|
static void sctp_intl_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
|
|
{
|
|
struct sctp_stream *stream = &ulpq->asoc->stream;
|
|
__u16 sid;
|
|
|
|
for (sid = 0; sid < stream->incnt; sid++) {
|
|
struct sctp_stream_in *sin = SCTP_SI(stream, sid);
|
|
__u32 mid;
|
|
|
|
if (sin->pd_mode_uo) {
|
|
sin->pd_mode_uo = 0;
|
|
|
|
mid = sin->mid_uo;
|
|
sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, gfp);
|
|
}
|
|
|
|
if (sin->pd_mode) {
|
|
sin->pd_mode = 0;
|
|
|
|
mid = sin->mid;
|
|
sctp_intl_stream_abort_pd(ulpq, sid, mid, 0, gfp);
|
|
sctp_mid_skip(stream, in, sid, mid);
|
|
|
|
sctp_intl_reap_ordered(ulpq, sid);
|
|
}
|
|
}
|
|
|
|
/* intl abort pd happens only when all data needs to be cleaned */
|
|
sctp_ulpq_flush(ulpq);
|
|
}
|
|
|
|
static inline int sctp_get_skip_pos(struct sctp_ifwdtsn_skip *skiplist,
|
|
int nskips, __be16 stream, __u8 flags)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nskips; i++)
|
|
if (skiplist[i].stream == stream &&
|
|
skiplist[i].flags == flags)
|
|
return i;
|
|
|
|
return i;
|
|
}
|
|
|
|
#define SCTP_FTSN_U_BIT 0x1
|
|
static void sctp_generate_iftsn(struct sctp_outq *q, __u32 ctsn)
|
|
{
|
|
struct sctp_ifwdtsn_skip ftsn_skip_arr[10];
|
|
struct sctp_association *asoc = q->asoc;
|
|
struct sctp_chunk *ftsn_chunk = NULL;
|
|
struct list_head *lchunk, *temp;
|
|
int nskips = 0, skip_pos;
|
|
struct sctp_chunk *chunk;
|
|
__u32 tsn;
|
|
|
|
if (!asoc->peer.prsctp_capable)
|
|
return;
|
|
|
|
if (TSN_lt(asoc->adv_peer_ack_point, ctsn))
|
|
asoc->adv_peer_ack_point = ctsn;
|
|
|
|
list_for_each_safe(lchunk, temp, &q->abandoned) {
|
|
chunk = list_entry(lchunk, struct sctp_chunk, transmitted_list);
|
|
tsn = ntohl(chunk->subh.data_hdr->tsn);
|
|
|
|
if (TSN_lte(tsn, ctsn)) {
|
|
list_del_init(lchunk);
|
|
sctp_chunk_free(chunk);
|
|
} else if (TSN_lte(tsn, asoc->adv_peer_ack_point + 1)) {
|
|
__be16 sid = chunk->subh.idata_hdr->stream;
|
|
__be32 mid = chunk->subh.idata_hdr->mid;
|
|
__u8 flags = 0;
|
|
|
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
|
|
flags |= SCTP_FTSN_U_BIT;
|
|
|
|
asoc->adv_peer_ack_point = tsn;
|
|
skip_pos = sctp_get_skip_pos(&ftsn_skip_arr[0], nskips,
|
|
sid, flags);
|
|
ftsn_skip_arr[skip_pos].stream = sid;
|
|
ftsn_skip_arr[skip_pos].reserved = 0;
|
|
ftsn_skip_arr[skip_pos].flags = flags;
|
|
ftsn_skip_arr[skip_pos].mid = mid;
|
|
if (skip_pos == nskips)
|
|
nskips++;
|
|
if (nskips == 10)
|
|
break;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (asoc->adv_peer_ack_point > ctsn)
|
|
ftsn_chunk = sctp_make_ifwdtsn(asoc, asoc->adv_peer_ack_point,
|
|
nskips, &ftsn_skip_arr[0]);
|
|
|
|
if (ftsn_chunk) {
|
|
list_add_tail(&ftsn_chunk->list, &q->control_chunk_list);
|
|
SCTP_INC_STATS(asoc->base.net, SCTP_MIB_OUTCTRLCHUNKS);
|
|
}
|
|
}
|
|
|
|
#define _sctp_walk_ifwdtsn(pos, chunk, end) \
|
|
for (pos = chunk->subh.ifwdtsn_hdr->skip; \
|
|
(void *)pos < (void *)chunk->subh.ifwdtsn_hdr->skip + (end); pos++)
|
|
|
|
#define sctp_walk_ifwdtsn(pos, ch) \
|
|
_sctp_walk_ifwdtsn((pos), (ch), ntohs((ch)->chunk_hdr->length) - \
|
|
sizeof(struct sctp_ifwdtsn_chunk))
|
|
|
|
static bool sctp_validate_fwdtsn(struct sctp_chunk *chunk)
|
|
{
|
|
struct sctp_fwdtsn_skip *skip;
|
|
__u16 incnt;
|
|
|
|
if (chunk->chunk_hdr->type != SCTP_CID_FWD_TSN)
|
|
return false;
|
|
|
|
incnt = chunk->asoc->stream.incnt;
|
|
sctp_walk_fwdtsn(skip, chunk)
|
|
if (ntohs(skip->stream) >= incnt)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool sctp_validate_iftsn(struct sctp_chunk *chunk)
|
|
{
|
|
struct sctp_ifwdtsn_skip *skip;
|
|
__u16 incnt;
|
|
|
|
if (chunk->chunk_hdr->type != SCTP_CID_I_FWD_TSN)
|
|
return false;
|
|
|
|
incnt = chunk->asoc->stream.incnt;
|
|
sctp_walk_ifwdtsn(skip, chunk)
|
|
if (ntohs(skip->stream) >= incnt)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void sctp_report_fwdtsn(struct sctp_ulpq *ulpq, __u32 ftsn)
|
|
{
|
|
/* Move the Cumulattive TSN Ack ahead. */
|
|
sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn);
|
|
/* purge the fragmentation queue */
|
|
sctp_ulpq_reasm_flushtsn(ulpq, ftsn);
|
|
/* Abort any in progress partial delivery. */
|
|
sctp_ulpq_abort_pd(ulpq, GFP_ATOMIC);
|
|
}
|
|
|
|
static void sctp_intl_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 ftsn)
|
|
{
|
|
struct sk_buff *pos, *tmp;
|
|
|
|
skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
|
|
struct sctp_ulpevent *event = sctp_skb2event(pos);
|
|
__u32 tsn = event->tsn;
|
|
|
|
if (TSN_lte(tsn, ftsn)) {
|
|
__skb_unlink(pos, &ulpq->reasm);
|
|
sctp_ulpevent_free(event);
|
|
}
|
|
}
|
|
|
|
skb_queue_walk_safe(&ulpq->reasm_uo, pos, tmp) {
|
|
struct sctp_ulpevent *event = sctp_skb2event(pos);
|
|
__u32 tsn = event->tsn;
|
|
|
|
if (TSN_lte(tsn, ftsn)) {
|
|
__skb_unlink(pos, &ulpq->reasm_uo);
|
|
sctp_ulpevent_free(event);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void sctp_report_iftsn(struct sctp_ulpq *ulpq, __u32 ftsn)
|
|
{
|
|
/* Move the Cumulattive TSN Ack ahead. */
|
|
sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn);
|
|
/* purge the fragmentation queue */
|
|
sctp_intl_reasm_flushtsn(ulpq, ftsn);
|
|
/* abort only when it's for all data */
|
|
if (ftsn == sctp_tsnmap_get_max_tsn_seen(&ulpq->asoc->peer.tsn_map))
|
|
sctp_intl_abort_pd(ulpq, GFP_ATOMIC);
|
|
}
|
|
|
|
static void sctp_handle_fwdtsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk)
|
|
{
|
|
struct sctp_fwdtsn_skip *skip;
|
|
|
|
/* Walk through all the skipped SSNs */
|
|
sctp_walk_fwdtsn(skip, chunk)
|
|
sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
|
|
}
|
|
|
|
static void sctp_intl_skip(struct sctp_ulpq *ulpq, __u16 sid, __u32 mid,
|
|
__u8 flags)
|
|
{
|
|
struct sctp_stream_in *sin = sctp_stream_in(&ulpq->asoc->stream, sid);
|
|
struct sctp_stream *stream = &ulpq->asoc->stream;
|
|
|
|
if (flags & SCTP_FTSN_U_BIT) {
|
|
if (sin->pd_mode_uo && MID_lt(sin->mid_uo, mid)) {
|
|
sin->pd_mode_uo = 0;
|
|
sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1,
|
|
GFP_ATOMIC);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (MID_lt(mid, sctp_mid_peek(stream, in, sid)))
|
|
return;
|
|
|
|
if (sin->pd_mode) {
|
|
sin->pd_mode = 0;
|
|
sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x0, GFP_ATOMIC);
|
|
}
|
|
|
|
sctp_mid_skip(stream, in, sid, mid);
|
|
|
|
sctp_intl_reap_ordered(ulpq, sid);
|
|
}
|
|
|
|
static void sctp_handle_iftsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk)
|
|
{
|
|
struct sctp_ifwdtsn_skip *skip;
|
|
|
|
/* Walk through all the skipped MIDs and abort stream pd if possible */
|
|
sctp_walk_ifwdtsn(skip, chunk)
|
|
sctp_intl_skip(ulpq, ntohs(skip->stream),
|
|
ntohl(skip->mid), skip->flags);
|
|
}
|
|
|
|
static int do_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event)
|
|
{
|
|
struct sk_buff_head temp;
|
|
|
|
skb_queue_head_init(&temp);
|
|
__skb_queue_tail(&temp, sctp_event2skb(event));
|
|
return sctp_ulpq_tail_event(ulpq, &temp);
|
|
}
|
|
|
|
static struct sctp_stream_interleave sctp_stream_interleave_0 = {
|
|
.data_chunk_len = sizeof(struct sctp_data_chunk),
|
|
.ftsn_chunk_len = sizeof(struct sctp_fwdtsn_chunk),
|
|
/* DATA process functions */
|
|
.make_datafrag = sctp_make_datafrag_empty,
|
|
.assign_number = sctp_chunk_assign_ssn,
|
|
.validate_data = sctp_validate_data,
|
|
.ulpevent_data = sctp_ulpq_tail_data,
|
|
.enqueue_event = do_ulpq_tail_event,
|
|
.renege_events = sctp_ulpq_renege,
|
|
.start_pd = sctp_ulpq_partial_delivery,
|
|
.abort_pd = sctp_ulpq_abort_pd,
|
|
/* FORWARD-TSN process functions */
|
|
.generate_ftsn = sctp_generate_fwdtsn,
|
|
.validate_ftsn = sctp_validate_fwdtsn,
|
|
.report_ftsn = sctp_report_fwdtsn,
|
|
.handle_ftsn = sctp_handle_fwdtsn,
|
|
};
|
|
|
|
static int do_sctp_enqueue_event(struct sctp_ulpq *ulpq,
|
|
struct sctp_ulpevent *event)
|
|
{
|
|
struct sk_buff_head temp;
|
|
|
|
skb_queue_head_init(&temp);
|
|
__skb_queue_tail(&temp, sctp_event2skb(event));
|
|
return sctp_enqueue_event(ulpq, &temp);
|
|
}
|
|
|
|
static struct sctp_stream_interleave sctp_stream_interleave_1 = {
|
|
.data_chunk_len = sizeof(struct sctp_idata_chunk),
|
|
.ftsn_chunk_len = sizeof(struct sctp_ifwdtsn_chunk),
|
|
/* I-DATA process functions */
|
|
.make_datafrag = sctp_make_idatafrag_empty,
|
|
.assign_number = sctp_chunk_assign_mid,
|
|
.validate_data = sctp_validate_idata,
|
|
.ulpevent_data = sctp_ulpevent_idata,
|
|
.enqueue_event = do_sctp_enqueue_event,
|
|
.renege_events = sctp_renege_events,
|
|
.start_pd = sctp_intl_start_pd,
|
|
.abort_pd = sctp_intl_abort_pd,
|
|
/* I-FORWARD-TSN process functions */
|
|
.generate_ftsn = sctp_generate_iftsn,
|
|
.validate_ftsn = sctp_validate_iftsn,
|
|
.report_ftsn = sctp_report_iftsn,
|
|
.handle_ftsn = sctp_handle_iftsn,
|
|
};
|
|
|
|
void sctp_stream_interleave_init(struct sctp_stream *stream)
|
|
{
|
|
struct sctp_association *asoc;
|
|
|
|
asoc = container_of(stream, struct sctp_association, stream);
|
|
stream->si = asoc->peer.intl_capable ? &sctp_stream_interleave_1
|
|
: &sctp_stream_interleave_0;
|
|
}
|