1 files changed, 33 insertions, 135 deletions

diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index ad98d6a322eb..b876c9c81c65 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -1,13 +1,13 @@
 /*
- *  net/dccp/packet_history.h
+ *  net/dccp/packet_history.c
  *
- *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
  *
  *  An implementation of the DCCP protocol
  *
  *  This code has been developed by the University of Waikato WAND
  *  research group. For further information please see http://www.wand.net.nz/
- *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
+ *  or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
  *
  *  This code also uses code from Lulea University, rereleased as GPL by its
  *  authors:
@@ -112,64 +112,27 @@ struct dccp_rx_hist_entry *
 
 EXPORT_SYMBOL_GPL(dccp_rx_hist_find_data_packet);
 
-int dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
+void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
                             struct list_head *rx_list,
                             struct list_head *li_list,
-                            struct dccp_rx_hist_entry *packet)
+                            struct dccp_rx_hist_entry *packet,
+                            u64 nonloss_seqno)
 {
-        struct dccp_rx_hist_entry *entry, *next, *iter;
+        struct dccp_rx_hist_entry *entry, *next;
         u8 num_later = 0;
 
-        iter = dccp_rx_hist_head(rx_list);
-        if (iter == NULL)
-                dccp_rx_hist_add_entry(rx_list, packet);
-        else {
-                const u64 seqno = packet->dccphrx_seqno;
-
-                if (after48(seqno, iter->dccphrx_seqno))
-                        dccp_rx_hist_add_entry(rx_list, packet);
-                else {
-                        if (dccp_rx_hist_entry_data_packet(iter))
-                                num_later = 1;
-
-                        list_for_each_entry_continue(iter, rx_list,
-                                                     dccphrx_node) {
-                                if (after48(seqno, iter->dccphrx_seqno)) {
-                                        dccp_rx_hist_add_entry(&iter->dccphrx_node,
-                                                               packet);
-                                        goto trim_history;
-                                }
-
-                                if (dccp_rx_hist_entry_data_packet(iter))
-                                        num_later++;
+        list_add(&packet->dccphrx_node, rx_list);
 
-                                if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
-                                        dccp_rx_hist_entry_delete(hist, packet);
-                                        return 1;
-                                }
-                        }
-
-                        if (num_later < TFRC_RECV_NUM_LATE_LOSS)
-                                dccp_rx_hist_add_entry(rx_list, packet);
-                        /*
-                         * FIXME: else what? should we destroy the packet
-                         * like above?
-                         */
-                }
-        }
-
-trim_history:
-        /*
-         * Trim history (remove all packets after the NUM_LATE_LOSS + 1
-         * data packets)
-         */
         num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
 
         if (!list_empty(li_list)) {
                 list_for_each_entry_safe(entry, next, rx_list, dccphrx_node) {
                         if (num_later == 0) {
-                                list_del_init(&entry->dccphrx_node);
-                                dccp_rx_hist_entry_delete(hist, entry);
+                                if (after48(nonloss_seqno,
+                                   entry->dccphrx_seqno)) {
+                                        list_del_init(&entry->dccphrx_node);
+                                        dccp_rx_hist_entry_delete(hist, entry);
+                                }
                         } else if (dccp_rx_hist_entry_data_packet(entry))
                                 --num_later;
                 }
@@ -217,94 +180,10 @@ trim_history:
                                 --num_later;
                 }
         }
-
-        return 0;
 }
 
 EXPORT_SYMBOL_GPL(dccp_rx_hist_add_packet);
 
-u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
-                             struct list_head *li_list, u8 *win_loss)
-{
-        struct dccp_rx_hist_entry *entry, *next, *packet;
-        struct dccp_rx_hist_entry *a_loss = NULL;
-        struct dccp_rx_hist_entry *b_loss = NULL;
-        u64 seq_loss = DCCP_MAX_SEQNO + 1;
-        u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
-
-        list_for_each_entry_safe(entry, next, rx_list, dccphrx_node) {
-                if (num_later == 0) {
-                        b_loss = entry;
-                        break;
-                } else if (dccp_rx_hist_entry_data_packet(entry))
-                        --num_later;
-        }
-
-        if (b_loss == NULL)
-                goto out;
-
-        num_later = 1;
-        list_for_each_entry_safe_continue(entry, next, rx_list, dccphrx_node) {
-                if (num_later == 0) {
-                        a_loss = entry;
-                        break;
-                } else if (dccp_rx_hist_entry_data_packet(entry))
-                        --num_later;
-        }
-
-        if (a_loss == NULL) {
-                if (list_empty(li_list)) {
-                        /* no loss event have occured yet */
-                        LIMIT_NETDEBUG("%s: TODO: find a lost data packet by "
-                                       "comparing to initial seqno\n",
-                                       __FUNCTION__);
-                        goto out;
-                } else {
-                        LIMIT_NETDEBUG("%s: Less than 4 data pkts in history!",
-                                       __FUNCTION__);
-                        goto out;
-                }
-        }
-
-        /* Locate a lost data packet */
-        entry = packet = b_loss;
-        list_for_each_entry_safe_continue(entry, next, rx_list, dccphrx_node) {
-                u64 delta = dccp_delta_seqno(entry->dccphrx_seqno,
-                                             packet->dccphrx_seqno);
-
-                if (delta != 0) {
-                        if (dccp_rx_hist_entry_data_packet(packet))
-                                --delta;
-                        /*
-                         * FIXME: check this, probably this % usage is because
-                         * in earlier drafts the ndp count was just 8 bits
-                         * long, but now it cam be up to 24 bits long.
-                         */
-#if 0
-                        if (delta % DCCP_NDP_LIMIT !=
-                            (packet->dccphrx_ndp -
-                             entry->dccphrx_ndp) % DCCP_NDP_LIMIT)
-#endif
-                        if (delta != packet->dccphrx_ndp - entry->dccphrx_ndp) {
-                                seq_loss = entry->dccphrx_seqno;
-                                dccp_inc_seqno(&seq_loss);
-                        }
-                }
-                packet = entry;
-                if (packet == a_loss)
-                        break;
-        }
-out:
-        if (seq_loss != DCCP_MAX_SEQNO + 1)
-                *win_loss = a_loss->dccphrx_ccval;
-        else
-                *win_loss = 0; /* Paranoia */
-
-        return seq_loss;
-}
-
-EXPORT_SYMBOL_GPL(dccp_rx_hist_detect_loss);
-
 struct dccp_tx_hist *dccp_tx_hist_new(const char *name)
 {
         struct dccp_tx_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
@@ -365,6 +244,25 @@ struct dccp_tx_hist_entry *
 
 EXPORT_SYMBOL_GPL(dccp_tx_hist_find_entry);
 
+int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
+   u8 *ccval)
+{
+        struct dccp_rx_hist_entry *packet = NULL, *entry;
+
+        list_for_each_entry(entry, list, dccphrx_node)
+                if (entry->dccphrx_seqno == seq) {
+                        packet = entry;
+                        break;
+                }
+
+        if (packet)
+                *ccval = packet->dccphrx_ccval;
+
+        return packet != NULL;
+}
+
+EXPORT_SYMBOL_GPL(dccp_rx_hist_find_entry);
+
 void dccp_tx_hist_purge_older(struct dccp_tx_hist *hist,
                               struct list_head *list,
                               struct dccp_tx_hist_entry *packet)
@@ -391,7 +289,7 @@ void dccp_tx_hist_purge(struct dccp_tx_hist *hist, struct list_head *list)
 
 EXPORT_SYMBOL_GPL(dccp_tx_hist_purge);
 
-MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
+MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
               "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
 MODULE_DESCRIPTION("DCCP TFRC library");
 MODULE_LICENSE("GPL");