[media] dvb-net: split the logic at dvb_net_ule() into other functions
This function is too big and too complex, making really hard to understand what's there. Split it into sub-routines, in order to make it easier to be understood, and to allow gcc to better parse it. As a bonus, it gets rid of a goto in the middle of a routine. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
efb9ab6725
commit
8b0041db80
@ -332,8 +332,458 @@ struct dvb_net_ule_handle {
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#endif
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};
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static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
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{
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/* We are about to process a new TS cell. */
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#ifdef ULE_DEBUG
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if (h->ule_where >= &h->ule_hist[100*TS_SZ])
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h->ule_where = h->ule_hist;
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memcpy(h->ule_where, h->ts, TS_SZ);
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if (h->ule_dump) {
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hexdump(h->ule_where, TS_SZ);
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h->ule_dump = 0;
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}
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h->ule_where += TS_SZ;
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#endif
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/*
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* Check TS h->error conditions: sync_byte, transport_error_indicator,
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* scrambling_control .
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*/
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if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
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((h->ts[3] & TS_SC) != 0)) {
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pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
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h->priv->ts_count, h->ts[0],
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(h->ts[1] & TS_TEI) >> 7,
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(h->ts[3] & TS_SC) >> 6);
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/* Drop partly decoded SNDU, reset state, resync on PUSI. */
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if (h->priv->ule_skb) {
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dev_kfree_skb(h->priv->ule_skb);
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/* Prepare for next SNDU. */
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h->dev->stats.rx_errors++;
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h->dev->stats.rx_frame_errors++;
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}
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reset_ule(h->priv);
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h->priv->need_pusi = 1;
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/* Continue with next TS cell. */
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h->ts += TS_SZ;
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h->priv->ts_count++;
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return 1;
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}
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h->ts_remain = 184;
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h->from_where = h->ts + 4;
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return 0;
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}
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static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
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{
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if (h->ts[1] & TS_PUSI) {
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/* Find beginning of first ULE SNDU in current TS cell. */
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/* Synchronize continuity counter. */
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h->priv->tscc = h->ts[3] & 0x0F;
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/* There is a pointer field here. */
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if (h->ts[4] > h->ts_remain) {
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pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
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h->priv->ts_count, h->ts[4]);
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h->ts += TS_SZ;
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h->priv->ts_count++;
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return 1;
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}
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/* Skip to destination of pointer field. */
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h->from_where = &h->ts[5] + h->ts[4];
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h->ts_remain -= 1 + h->ts[4];
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h->skipped = 0;
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} else {
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h->skipped++;
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h->ts += TS_SZ;
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h->priv->ts_count++;
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return 1;
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}
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return 0;
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}
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static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
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{
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/* Check continuity counter. */
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if ((h->ts[3] & 0x0F) == h->priv->tscc)
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h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
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else {
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/* TS discontinuity handling: */
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pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
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h->priv->ts_count, h->ts[3] & 0x0F,
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h->priv->tscc);
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/* Drop partly decoded SNDU, reset state, resync on PUSI. */
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if (h->priv->ule_skb) {
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dev_kfree_skb(h->priv->ule_skb);
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/* Prepare for next SNDU. */
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// reset_ule(h->priv); moved to below.
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h->dev->stats.rx_errors++;
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h->dev->stats.rx_frame_errors++;
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}
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reset_ule(h->priv);
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/* skip to next PUSI. */
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h->priv->need_pusi = 1;
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return 1;
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}
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/*
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* If we still have an incomplete payload, but PUSI is
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* set; some TS cells are missing.
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* This is only possible here, if we missed exactly 16 TS
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* cells (continuity counter wrap).
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*/
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if (h->ts[1] & TS_PUSI) {
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if (!h->priv->need_pusi) {
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if (!(*h->from_where < (h->ts_remain-1)) ||
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*h->from_where != h->priv->ule_sndu_remain) {
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/*
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* Pointer field is invalid.
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* Drop this TS cell and any started ULE SNDU.
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*/
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pr_warn("%lu: Invalid pointer field: %u.\n",
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h->priv->ts_count,
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*h->from_where);
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/*
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* Drop partly decoded SNDU, reset state,
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* resync on PUSI.
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*/
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if (h->priv->ule_skb) {
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h->error = true;
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dev_kfree_skb(h->priv->ule_skb);
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}
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if (h->error || h->priv->ule_sndu_remain) {
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h->dev->stats.rx_errors++;
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h->dev->stats.rx_frame_errors++;
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h->error = false;
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}
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reset_ule(h->priv);
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h->priv->need_pusi = 1;
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return 1;
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}
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/*
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* Skip pointer field (we're processing a
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* packed payload).
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*/
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h->from_where += 1;
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h->ts_remain -= 1;
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} else
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h->priv->need_pusi = 0;
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if (h->priv->ule_sndu_remain > 183) {
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/*
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* Current SNDU lacks more data than there
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* could be available in the current TS cell.
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*/
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h->dev->stats.rx_errors++;
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h->dev->stats.rx_length_errors++;
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pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d). Flushing incomplete payload.\n",
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h->priv->ts_count,
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h->priv->ule_sndu_remain,
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h->ts[4], h->ts_remain);
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dev_kfree_skb(h->priv->ule_skb);
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/* Prepare for next SNDU. */
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reset_ule(h->priv);
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/*
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* Resync: go to where pointer field points to:
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* start of next ULE SNDU.
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*/
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h->from_where += h->ts[4];
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h->ts_remain -= h->ts[4];
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}
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}
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return 0;
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}
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/*
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* Start a new payload with skb.
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* Find ULE header. It is only guaranteed that the
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* length field (2 bytes) is contained in the current
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* TS.
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* Check h.ts_remain has to be >= 2 here.
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*/
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static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
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{
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if (h->ts_remain < 2) {
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pr_warn("Invalid payload packing: only %d bytes left in TS. Resyncing.\n",
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h->ts_remain);
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h->priv->ule_sndu_len = 0;
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h->priv->need_pusi = 1;
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h->ts += TS_SZ;
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return 1;
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}
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if (!h->priv->ule_sndu_len) {
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/* Got at least two bytes, thus extrace the SNDU length. */
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h->priv->ule_sndu_len = h->from_where[0] << 8 |
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h->from_where[1];
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if (h->priv->ule_sndu_len & 0x8000) {
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/* D-Bit is set: no dest mac present. */
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h->priv->ule_sndu_len &= 0x7FFF;
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h->priv->ule_dbit = 1;
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} else
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h->priv->ule_dbit = 0;
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if (h->priv->ule_sndu_len < 5) {
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pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
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h->priv->ts_count,
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h->priv->ule_sndu_len);
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h->dev->stats.rx_errors++;
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h->dev->stats.rx_length_errors++;
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h->priv->ule_sndu_len = 0;
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h->priv->need_pusi = 1;
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h->new_ts = 1;
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h->ts += TS_SZ;
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h->priv->ts_count++;
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return 1;
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}
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h->ts_remain -= 2; /* consume the 2 bytes SNDU length. */
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h->from_where += 2;
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}
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h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
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/*
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* State of current TS:
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* h->ts_remain (remaining bytes in the current TS cell)
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* 0 ule_type is not available now, we need the next TS cell
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* 1 the first byte of the ule_type is present
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* >=2 full ULE header present, maybe some payload data as well.
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*/
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switch (h->ts_remain) {
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case 1:
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h->priv->ule_sndu_remain--;
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h->priv->ule_sndu_type = h->from_where[0] << 8;
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/* first byte of ule_type is set. */
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h->priv->ule_sndu_type_1 = 1;
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h->ts_remain -= 1;
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h->from_where += 1;
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/* fallthrough */
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case 0:
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h->new_ts = 1;
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h->ts += TS_SZ;
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h->priv->ts_count++;
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return 1;
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default: /* complete ULE header is present in current TS. */
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/* Extract ULE type field. */
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if (h->priv->ule_sndu_type_1) {
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h->priv->ule_sndu_type_1 = 0;
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h->priv->ule_sndu_type |= h->from_where[0];
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h->from_where += 1; /* points to payload start. */
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h->ts_remain -= 1;
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} else {
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/* Complete type is present in new TS. */
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h->priv->ule_sndu_type = h->from_where[0] << 8 |
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h->from_where[1];
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h->from_where += 2; /* points to payload start. */
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h->ts_remain -= 2;
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}
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break;
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}
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/*
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* Allocate the skb (decoder target buffer) with the correct size,
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* as follows:
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*
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* prepare for the largest case: bridged SNDU with MAC address
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* (dbit = 0).
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*/
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h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
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ETH_HLEN + ETH_ALEN);
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if (!h->priv->ule_skb) {
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pr_notice("%s: Memory squeeze, dropping packet.\n",
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h->dev->name);
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h->dev->stats.rx_dropped++;
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return -1;
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}
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/* This includes the CRC32 _and_ dest mac, if !dbit. */
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h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
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h->priv->ule_skb->dev = h->dev;
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/*
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* Leave space for Ethernet or bridged SNDU header
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* (eth hdr plus one MAC addr).
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*/
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skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
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return 0;
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}
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static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
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{
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static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
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/*
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* The destination MAC address is the next data in the skb. It comes
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* before any extension headers.
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*
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* Check if the payload of this SNDU should be passed up the stack.
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*/
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if (h->priv->rx_mode == RX_MODE_PROMISC)
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return 0;
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if (h->priv->ule_skb->data[0] & 0x01) {
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/* multicast or broadcast */
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if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
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/* multicast */
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if (h->priv->rx_mode == RX_MODE_MULTI) {
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int i;
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for (i = 0; i < h->priv->multi_num &&
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!ether_addr_equal(h->priv->ule_skb->data,
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h->priv->multi_macs[i]);
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i++)
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;
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if (i == h->priv->multi_num)
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return 1;
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} else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
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return 1; /* no broadcast; */
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/*
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* else:
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* all multicast mode: accept all multicast packets
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*/
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}
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/* else: broadcast */
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} else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
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return 1;
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return 0;
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}
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static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
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u32 ule_crc, u32 expected_crc)
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{
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u8 dest_addr[ETH_ALEN];
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if (ule_crc != expected_crc) {
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pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
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h->priv->ts_count, ule_crc, expected_crc,
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h->priv->ule_sndu_len, h->priv->ule_sndu_type,
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h->ts_remain,
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h->ts_remain > 2 ?
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*(unsigned short *)h->from_where : 0);
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#ifdef ULE_DEBUG
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hexdump(iov[0].iov_base, iov[0].iov_len);
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hexdump(iov[1].iov_base, iov[1].iov_len);
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hexdump(iov[2].iov_base, iov[2].iov_len);
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if (h->ule_where == h->ule_hist) {
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hexdump(&h->ule_hist[98*TS_SZ], TS_SZ);
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hexdump(&h->ule_hist[99*TS_SZ], TS_SZ);
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} else if (h->ule_where == &h->ule_hist[TS_SZ]) {
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hexdump(&h->ule_hist[99*TS_SZ], TS_SZ);
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hexdump(h->ule_hist, TS_SZ);
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} else {
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hexdump(h->ule_where - TS_SZ - TS_SZ, TS_SZ);
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hexdump(h->ule_where - TS_SZ, TS_SZ);
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}
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h->ule_dump = 1;
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#endif
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h->dev->stats.rx_errors++;
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h->dev->stats.rx_crc_errors++;
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dev_kfree_skb(h->priv->ule_skb);
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return;
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}
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/* CRC32 verified OK. */
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/* CRC32 was OK, so remove it from skb. */
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h->priv->ule_skb->tail -= 4;
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h->priv->ule_skb->len -= 4;
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if (!h->priv->ule_dbit) {
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if (dvb_net_ule_should_drop(h)) {
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#ifdef ULE_DEBUG
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netdev_dbg(h->dev,
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"Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
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h->priv->ule_skb->data, h->dev->dev_addr);
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#endif
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dev_kfree_skb(h->priv->ule_skb);
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return;
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}
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skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
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ETH_ALEN);
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skb_pull(h->priv->ule_skb, ETH_ALEN);
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}
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/* Handle ULE Extension Headers. */
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if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
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/* There is an extension header. Handle it accordingly. */
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int l = handle_ule_extensions(h->priv);
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if (l < 0) {
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/*
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* Mandatory extension header unknown or TEST SNDU.
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* Drop it.
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*/
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// pr_warn("Dropping SNDU, extension headers.\n" );
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dev_kfree_skb(h->priv->ule_skb);
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return;
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}
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skb_pull(h->priv->ule_skb, l);
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}
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/*
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* Construct/assure correct ethernet header.
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* Note: in bridged mode (h->priv->ule_bridged != 0)
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* we already have the (original) ethernet
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* header at the start of the payload (after
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* optional dest. address and any extension
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* headers).
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*/
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if (!h->priv->ule_bridged) {
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skb_push(h->priv->ule_skb, ETH_HLEN);
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h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
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if (!h->priv->ule_dbit) {
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/*
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* dest_addr buffer is only valid if
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* h->priv->ule_dbit == 0
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*/
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memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
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eth_zero_addr(h->ethh->h_source);
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} else /* zeroize source and dest */
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memset(h->ethh, 0, ETH_ALEN * 2);
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h->ethh->h_proto = htons(h->priv->ule_sndu_type);
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}
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/* else: skb is in correct state; nothing to do. */
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h->priv->ule_bridged = 0;
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/* Stuff into kernel's protocol stack. */
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h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
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h->dev);
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/*
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* If D-bit is set (i.e. destination MAC address not present),
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* receive the packet anyhow.
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*/
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#if 0
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if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
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h->priv->ule_skb->pkt_type = PACKET_HOST;
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#endif
|
||||
h->dev->stats.rx_packets++;
|
||||
h->dev->stats.rx_bytes += h->priv->ule_skb->len;
|
||||
netif_rx(h->priv->ule_skb);
|
||||
}
|
||||
|
||||
static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
|
||||
{
|
||||
int ret;
|
||||
struct dvb_net_ule_handle h = {
|
||||
.dev = dev,
|
||||
.buf = buf,
|
||||
@ -352,251 +802,42 @@ static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
|
||||
#endif
|
||||
};
|
||||
|
||||
/* For all TS cells in current buffer.
|
||||
/*
|
||||
* For all TS cells in current buffer.
|
||||
* Appearently, we are called for every single TS cell.
|
||||
*/
|
||||
for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len; h.ts < h.ts_end; /* no incr. */ ) {
|
||||
for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
|
||||
h.ts < h.ts_end; /* no incr. */) {
|
||||
if (h.new_ts) {
|
||||
/* We are about to process a new TS cell. */
|
||||
|
||||
#ifdef ULE_DEBUG
|
||||
if (h.ule_where >= &h.ule_hist[100*TS_SZ]) h.ule_where = h.ule_hist;
|
||||
memcpy( h.ule_where, h.ts, TS_SZ );
|
||||
if (h.ule_dump) {
|
||||
hexdump( h.ule_where, TS_SZ );
|
||||
h.ule_dump = 0;
|
||||
}
|
||||
h.ule_where += TS_SZ;
|
||||
#endif
|
||||
|
||||
/* Check TS h.error conditions: sync_byte, transport_error_indicator, scrambling_control . */
|
||||
if ((h.ts[0] != TS_SYNC) || (h.ts[1] & TS_TEI) || ((h.ts[3] & TS_SC) != 0)) {
|
||||
pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
|
||||
h.priv->ts_count, h.ts[0],
|
||||
(h.ts[1] & TS_TEI) >> 7,
|
||||
(h.ts[3] & TS_SC) >> 6);
|
||||
|
||||
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
|
||||
if (h.priv->ule_skb) {
|
||||
dev_kfree_skb( h.priv->ule_skb );
|
||||
/* Prepare for next SNDU. */
|
||||
h.dev->stats.rx_errors++;
|
||||
h.dev->stats.rx_frame_errors++;
|
||||
}
|
||||
reset_ule(h.priv);
|
||||
h.priv->need_pusi = 1;
|
||||
|
||||
/* Continue with next TS cell. */
|
||||
h.ts += TS_SZ;
|
||||
h.priv->ts_count++;
|
||||
if (dvb_net_ule_new_ts_cell(&h))
|
||||
continue;
|
||||
}
|
||||
|
||||
h.ts_remain = 184;
|
||||
h.from_where = h.ts + 4;
|
||||
}
|
||||
|
||||
/* Synchronize on PUSI, if required. */
|
||||
if (h.priv->need_pusi) {
|
||||
if (h.ts[1] & TS_PUSI) {
|
||||
/* Find beginning of first ULE SNDU in current TS cell. */
|
||||
/* Synchronize continuity counter. */
|
||||
h.priv->tscc = h.ts[3] & 0x0F;
|
||||
/* There is a pointer field here. */
|
||||
if (h.ts[4] > h.ts_remain) {
|
||||
pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
|
||||
h.priv->ts_count, h.ts[4]);
|
||||
h.ts += TS_SZ;
|
||||
h.priv->ts_count++;
|
||||
continue;
|
||||
}
|
||||
/* Skip to destination of pointer field. */
|
||||
h.from_where = &h.ts[5] + h.ts[4];
|
||||
h.ts_remain -= 1 + h.ts[4];
|
||||
h.skipped = 0;
|
||||
} else {
|
||||
h.skipped++;
|
||||
h.ts += TS_SZ;
|
||||
h.priv->ts_count++;
|
||||
if (dvb_net_ule_ts_pusi(&h))
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
if (h.new_ts) {
|
||||
/* Check continuity counter. */
|
||||
if ((h.ts[3] & 0x0F) == h.priv->tscc)
|
||||
h.priv->tscc = (h.priv->tscc + 1) & 0x0F;
|
||||
else {
|
||||
/* TS discontinuity handling: */
|
||||
pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
|
||||
h.priv->ts_count, h.ts[3] & 0x0F,
|
||||
h.priv->tscc);
|
||||
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
|
||||
if (h.priv->ule_skb) {
|
||||
dev_kfree_skb( h.priv->ule_skb );
|
||||
/* Prepare for next SNDU. */
|
||||
// reset_ule(h.priv); moved to below.
|
||||
h.dev->stats.rx_errors++;
|
||||
h.dev->stats.rx_frame_errors++;
|
||||
}
|
||||
reset_ule(h.priv);
|
||||
/* skip to next PUSI. */
|
||||
h.priv->need_pusi = 1;
|
||||
if (dvb_net_ule_new_ts(&h))
|
||||
continue;
|
||||
}
|
||||
/* If we still have an incomplete payload, but PUSI is
|
||||
* set; some TS cells are missing.
|
||||
* This is only possible here, if we missed exactly 16 TS
|
||||
* cells (continuity counter wrap). */
|
||||
if (h.ts[1] & TS_PUSI) {
|
||||
if (! h.priv->need_pusi) {
|
||||
if (!(*h.from_where < (h.ts_remain-1)) || *h.from_where != h.priv->ule_sndu_remain) {
|
||||
/* Pointer field is invalid. Drop this TS cell and any started ULE SNDU. */
|
||||
pr_warn("%lu: Invalid pointer field: %u.\n",
|
||||
h.priv->ts_count,
|
||||
*h.from_where);
|
||||
|
||||
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
|
||||
if (h.priv->ule_skb) {
|
||||
h.error = true;
|
||||
dev_kfree_skb(h.priv->ule_skb);
|
||||
}
|
||||
|
||||
if (h.error || h.priv->ule_sndu_remain) {
|
||||
h.dev->stats.rx_errors++;
|
||||
h.dev->stats.rx_frame_errors++;
|
||||
h.error = false;
|
||||
}
|
||||
|
||||
reset_ule(h.priv);
|
||||
h.priv->need_pusi = 1;
|
||||
continue;
|
||||
}
|
||||
/* Skip pointer field (we're processing a
|
||||
* packed payload). */
|
||||
h.from_where += 1;
|
||||
h.ts_remain -= 1;
|
||||
} else
|
||||
h.priv->need_pusi = 0;
|
||||
|
||||
if (h.priv->ule_sndu_remain > 183) {
|
||||
/* Current SNDU lacks more data than there could be available in the
|
||||
* current TS cell. */
|
||||
h.dev->stats.rx_errors++;
|
||||
h.dev->stats.rx_length_errors++;
|
||||
pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h.ts_remain %d). Flushing incomplete payload.\n",
|
||||
h.priv->ts_count,
|
||||
h.priv->ule_sndu_remain,
|
||||
h.ts[4], h.ts_remain);
|
||||
dev_kfree_skb(h.priv->ule_skb);
|
||||
/* Prepare for next SNDU. */
|
||||
reset_ule(h.priv);
|
||||
/* Resync: go to where pointer field points to: start of next ULE SNDU. */
|
||||
h.from_where += h.ts[4];
|
||||
h.ts_remain -= h.ts[4];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Check if new payload needs to be started. */
|
||||
if (h.priv->ule_skb == NULL) {
|
||||
/* Start a new payload with skb.
|
||||
* Find ULE header. It is only guaranteed that the
|
||||
* length field (2 bytes) is contained in the current
|
||||
* TS.
|
||||
* Check h.ts_remain has to be >= 2 here. */
|
||||
if (h.ts_remain < 2) {
|
||||
pr_warn("Invalid payload packing: only %d bytes left in TS. Resyncing.\n",
|
||||
h.ts_remain);
|
||||
h.priv->ule_sndu_len = 0;
|
||||
h.priv->need_pusi = 1;
|
||||
h.ts += TS_SZ;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (! h.priv->ule_sndu_len) {
|
||||
/* Got at least two bytes, thus extrace the SNDU length. */
|
||||
h.priv->ule_sndu_len = h.from_where[0] << 8 | h.from_where[1];
|
||||
if (h.priv->ule_sndu_len & 0x8000) {
|
||||
/* D-Bit is set: no dest mac present. */
|
||||
h.priv->ule_sndu_len &= 0x7FFF;
|
||||
h.priv->ule_dbit = 1;
|
||||
} else
|
||||
h.priv->ule_dbit = 0;
|
||||
|
||||
if (h.priv->ule_sndu_len < 5) {
|
||||
pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
|
||||
h.priv->ts_count,
|
||||
h.priv->ule_sndu_len);
|
||||
h.dev->stats.rx_errors++;
|
||||
h.dev->stats.rx_length_errors++;
|
||||
h.priv->ule_sndu_len = 0;
|
||||
h.priv->need_pusi = 1;
|
||||
h.new_ts = 1;
|
||||
h.ts += TS_SZ;
|
||||
h.priv->ts_count++;
|
||||
continue;
|
||||
}
|
||||
h.ts_remain -= 2; /* consume the 2 bytes SNDU length. */
|
||||
h.from_where += 2;
|
||||
}
|
||||
|
||||
h.priv->ule_sndu_remain = h.priv->ule_sndu_len + 2;
|
||||
/*
|
||||
* State of current TS:
|
||||
* h.ts_remain (remaining bytes in the current TS cell)
|
||||
* 0 ule_type is not available now, we need the next TS cell
|
||||
* 1 the first byte of the ule_type is present
|
||||
* >=2 full ULE header present, maybe some payload data as well.
|
||||
*/
|
||||
switch (h.ts_remain) {
|
||||
case 1:
|
||||
h.priv->ule_sndu_remain--;
|
||||
h.priv->ule_sndu_type = h.from_where[0] << 8;
|
||||
h.priv->ule_sndu_type_1 = 1; /* first byte of ule_type is set. */
|
||||
h.ts_remain -= 1; h.from_where += 1;
|
||||
/* Continue w/ next TS. */
|
||||
case 0:
|
||||
h.new_ts = 1;
|
||||
h.ts += TS_SZ;
|
||||
h.priv->ts_count++;
|
||||
continue;
|
||||
|
||||
default: /* complete ULE header is present in current TS. */
|
||||
/* Extract ULE type field. */
|
||||
if (h.priv->ule_sndu_type_1) {
|
||||
h.priv->ule_sndu_type_1 = 0;
|
||||
h.priv->ule_sndu_type |= h.from_where[0];
|
||||
h.from_where += 1; /* points to payload start. */
|
||||
h.ts_remain -= 1;
|
||||
} else {
|
||||
/* Complete type is present in new TS. */
|
||||
h.priv->ule_sndu_type = h.from_where[0] << 8 | h.from_where[1];
|
||||
h.from_where += 2; /* points to payload start. */
|
||||
h.ts_remain -= 2;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
/* Allocate the skb (decoder target buffer) with the correct size, as follows:
|
||||
* prepare for the largest case: bridged SNDU with MAC address (dbit = 0). */
|
||||
h.priv->ule_skb = dev_alloc_skb( h.priv->ule_sndu_len + ETH_HLEN + ETH_ALEN );
|
||||
if (h.priv->ule_skb == NULL) {
|
||||
pr_notice("%s: Memory squeeze, dropping packet.\n",
|
||||
h.dev->name);
|
||||
h.dev->stats.rx_dropped++;
|
||||
ret = dvb_net_ule_new_payload(&h);
|
||||
if (ret < 0)
|
||||
return;
|
||||
}
|
||||
|
||||
/* This includes the CRC32 _and_ dest mac, if !dbit. */
|
||||
h.priv->ule_sndu_remain = h.priv->ule_sndu_len;
|
||||
h.priv->ule_skb->dev = h.dev;
|
||||
/* Leave space for Ethernet or bridged SNDU header (eth hdr plus one MAC addr). */
|
||||
skb_reserve( h.priv->ule_skb, ETH_HLEN + ETH_ALEN );
|
||||
if (ret)
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Copy data into our current skb. */
|
||||
h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
|
||||
memcpy(skb_put(h.priv->ule_skb, h.how_much), h.from_where, h.how_much);
|
||||
memcpy(skb_put(h.priv->ule_skb, h.how_much),
|
||||
h.from_where, h.how_much);
|
||||
h.priv->ule_sndu_remain -= h.how_much;
|
||||
h.ts_remain -= h.how_much;
|
||||
h.from_where += h.how_much;
|
||||
@ -610,7 +851,8 @@ static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
|
||||
struct kvec iov[3] = {
|
||||
{ &ulen, sizeof ulen },
|
||||
{ &utype, sizeof utype },
|
||||
{ h.priv->ule_skb->data, h.priv->ule_skb->len - 4 }
|
||||
{ h.priv->ule_skb->data,
|
||||
h.priv->ule_skb->len - 4 }
|
||||
};
|
||||
u32 ule_crc = ~0L, expected_crc;
|
||||
if (h.priv->ule_dbit) {
|
||||
@ -625,145 +867,9 @@ static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
|
||||
*(tail - 3) << 16 |
|
||||
*(tail - 2) << 8 |
|
||||
*(tail - 1);
|
||||
if (ule_crc != expected_crc) {
|
||||
pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, h.ts_remain %d, next 2: %x.\n",
|
||||
h.priv->ts_count, ule_crc, expected_crc,
|
||||
h.priv->ule_sndu_len, h.priv->ule_sndu_type,
|
||||
h.ts_remain,
|
||||
h.ts_remain > 2 ? *(unsigned short *)h.from_where : 0);
|
||||
|
||||
#ifdef ULE_DEBUG
|
||||
hexdump( iov[0].iov_base, iov[0].iov_len );
|
||||
hexdump( iov[1].iov_base, iov[1].iov_len );
|
||||
hexdump( iov[2].iov_base, iov[2].iov_len );
|
||||
dvb_net_ule_check_crc(&h, ule_crc, expected_crc);
|
||||
|
||||
if (h.ule_where == h.ule_hist) {
|
||||
hexdump( &h.ule_hist[98*TS_SZ], TS_SZ );
|
||||
hexdump( &h.ule_hist[99*TS_SZ], TS_SZ );
|
||||
} else if (h.ule_where == &h.ule_hist[TS_SZ]) {
|
||||
hexdump( &h.ule_hist[99*TS_SZ], TS_SZ );
|
||||
hexdump( h.ule_hist, TS_SZ );
|
||||
} else {
|
||||
hexdump( h.ule_where - TS_SZ - TS_SZ, TS_SZ );
|
||||
hexdump( h.ule_where - TS_SZ, TS_SZ );
|
||||
}
|
||||
h.ule_dump = 1;
|
||||
#endif
|
||||
|
||||
h.dev->stats.rx_errors++;
|
||||
h.dev->stats.rx_crc_errors++;
|
||||
dev_kfree_skb(h.priv->ule_skb);
|
||||
} else {
|
||||
/* CRC32 verified OK. */
|
||||
u8 dest_addr[ETH_ALEN];
|
||||
static const u8 bc_addr[ETH_ALEN] =
|
||||
{ [ 0 ... ETH_ALEN-1] = 0xff };
|
||||
|
||||
/* CRC32 was OK. Remove it from skb. */
|
||||
h.priv->ule_skb->tail -= 4;
|
||||
h.priv->ule_skb->len -= 4;
|
||||
|
||||
if (!h.priv->ule_dbit) {
|
||||
/*
|
||||
* The destination MAC address is the
|
||||
* next data in the skb. It comes
|
||||
* before any extension headers.
|
||||
*
|
||||
* Check if the payload of this SNDU
|
||||
* should be passed up the stack.
|
||||
*/
|
||||
register int drop = 0;
|
||||
if (h.priv->rx_mode != RX_MODE_PROMISC) {
|
||||
if (h.priv->ule_skb->data[0] & 0x01) {
|
||||
/* multicast or broadcast */
|
||||
if (!ether_addr_equal(h.priv->ule_skb->data, bc_addr)) {
|
||||
/* multicast */
|
||||
if (h.priv->rx_mode == RX_MODE_MULTI) {
|
||||
int i;
|
||||
for(i = 0; i < h.priv->multi_num &&
|
||||
!ether_addr_equal(h.priv->ule_skb->data,
|
||||
h.priv->multi_macs[i]); i++)
|
||||
;
|
||||
if (i == h.priv->multi_num)
|
||||
drop = 1;
|
||||
} else if (h.priv->rx_mode != RX_MODE_ALL_MULTI)
|
||||
drop = 1; /* no broadcast; */
|
||||
/* else: all multicast mode: accept all multicast packets */
|
||||
}
|
||||
/* else: broadcast */
|
||||
}
|
||||
else if (!ether_addr_equal(h.priv->ule_skb->data, h.dev->dev_addr))
|
||||
drop = 1;
|
||||
/* else: destination address matches the MAC address of our receiver device */
|
||||
}
|
||||
/* else: promiscuous mode; pass everything up the stack */
|
||||
|
||||
if (drop) {
|
||||
#ifdef ULE_DEBUG
|
||||
netdev_dbg(h.dev, "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h.dev addr: %pM\n",
|
||||
h.priv->ule_skb->data, h.dev->dev_addr);
|
||||
#endif
|
||||
dev_kfree_skb(h.priv->ule_skb);
|
||||
goto sndu_done;
|
||||
}
|
||||
else
|
||||
{
|
||||
skb_copy_from_linear_data(h.priv->ule_skb,
|
||||
dest_addr,
|
||||
ETH_ALEN);
|
||||
skb_pull(h.priv->ule_skb, ETH_ALEN);
|
||||
}
|
||||
}
|
||||
|
||||
/* Handle ULE Extension Headers. */
|
||||
if (h.priv->ule_sndu_type < ETH_P_802_3_MIN) {
|
||||
/* There is an extension header. Handle it accordingly. */
|
||||
int l = handle_ule_extensions(h.priv);
|
||||
if (l < 0) {
|
||||
/* Mandatory extension header unknown or TEST SNDU. Drop it. */
|
||||
// pr_warn("Dropping SNDU, extension headers.\n" );
|
||||
dev_kfree_skb(h.priv->ule_skb);
|
||||
goto sndu_done;
|
||||
}
|
||||
skb_pull(h.priv->ule_skb, l);
|
||||
}
|
||||
|
||||
/*
|
||||
* Construct/assure correct ethernet header.
|
||||
* Note: in bridged mode (h.priv->ule_bridged !=
|
||||
* 0) we already have the (original) ethernet
|
||||
* header at the start of the payload (after
|
||||
* optional dest. address and any extension
|
||||
* headers).
|
||||
*/
|
||||
|
||||
if (!h.priv->ule_bridged) {
|
||||
skb_push(h.priv->ule_skb, ETH_HLEN);
|
||||
h.ethh = (struct ethhdr *)h.priv->ule_skb->data;
|
||||
if (!h.priv->ule_dbit) {
|
||||
/* dest_addr buffer is only valid if h.priv->ule_dbit == 0 */
|
||||
memcpy(h.ethh->h_dest, dest_addr, ETH_ALEN);
|
||||
eth_zero_addr(h.ethh->h_source);
|
||||
}
|
||||
else /* zeroize source and dest */
|
||||
memset( h.ethh, 0, ETH_ALEN*2 );
|
||||
|
||||
h.ethh->h_proto = htons(h.priv->ule_sndu_type);
|
||||
}
|
||||
/* else: skb is in correct state; nothing to do. */
|
||||
h.priv->ule_bridged = 0;
|
||||
|
||||
/* Stuff into kernel's protocol stack. */
|
||||
h.priv->ule_skb->protocol = dvb_net_eth_type_trans(h.priv->ule_skb, h.dev);
|
||||
/* If D-bit is set (i.e. destination MAC address not present),
|
||||
* receive the packet anyhow. */
|
||||
/* if (h.priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
|
||||
h.priv->ule_skb->pkt_type = PACKET_HOST; */
|
||||
h.dev->stats.rx_packets++;
|
||||
h.dev->stats.rx_bytes += h.priv->ule_skb->len;
|
||||
netif_rx(h.priv->ule_skb);
|
||||
}
|
||||
sndu_done:
|
||||
/* Prepare for next SNDU. */
|
||||
reset_ule(h.priv);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user