Function sctp_handle_stream_reset

freebsd/netinet/sctp_input.c:3998–4169

#ifdef __GNUC__
__attribute__((noinline))
#endif
static int
sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
    struct sctp_chunkhdr *ch_req)
{
	uint16_t remaining_length, param_len, ptype;
	struct sctp_paramhdr pstore;
	uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
	uint32_t seq = 0;
	int num_req = 0;
	int trunc = 0;
	struct sctp_tmit_chunk *chk;
	struct sctp_chunkhdr *ch;
	struct sctp_paramhdr *ph;
	int ret_code = 0;
	int num_param = 0;

	/* now it may be a reset or a reset-response */
	remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);

	/* setup for adding the response */
	sctp_alloc_a_chunk(stcb, chk);
	if (chk == NULL) {
		return (ret_code);
	}
	chk->copy_by_ref = 0;
	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
	chk->rec.chunk_id.can_take_data = 0;
	chk->flags = 0;
	chk->asoc = &stcb->asoc;
	chk->no_fr_allowed = 0;
	chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
	chk->book_size_scale = 0;
	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
	if (chk->data == NULL) {
strres_nochunk:
		if (chk->data) {
			sctp_m_freem(chk->data);
			chk->data = NULL;
		}
		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
		return (ret_code);
	}
	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);

	/* setup chunk parameters */
	chk->sent = SCTP_DATAGRAM_UNSENT;
	chk->snd_count = 0;
	chk->whoTo = NULL;

	ch = mtod(chk->data, struct sctp_chunkhdr *);
	ch->chunk_type = SCTP_STREAM_RESET;
	ch->chunk_flags = 0;
	ch->chunk_length = htons(chk->send_size);
	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
	offset += sizeof(struct sctp_chunkhdr);
	while (remaining_length >= sizeof(struct sctp_paramhdr)) {