[DCCP]: Introduce dccp_rx_hist_find_entry

This adds a new function dccp_rx_hist_find_entry.

Signed off by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 21 insertions, 0 deletions

diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index 7b6b03e927..420c60f860 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -365,6 +365,25 @@ 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)
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index 27c4309263..aea9c5d709 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -106,6 +106,8 @@ static inline void dccp_tx_hist_entry_delete(struct dccp_tx_hist *hist,
 extern struct dccp_tx_hist_entry *
                         dccp_tx_hist_find_entry(const struct list_head *list,
                                                 const u64 seq);
+extern int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
+   u8 *ccval);
 
 static inline void dccp_tx_hist_add_entry(struct list_head *list,
                                           struct dccp_tx_hist_entry *entry)