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diff --git a/src/ipcpd/unicast/ca/ops.h b/src/ipcpd/unicast/ca/ops.h
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+/*
+ * Ouroboros - Copyright (C) 2016 - 2021
+ *
+ * Congestion avoidance policy ops
+ *
+ * Dimitri Staessens <dimitri@ouroboros.rocks>
+ * Sander Vrijders <sander@ouroboros.rocks>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#ifndef OUROBOROS_IPCPD_UNICAST_CA_OPS_H
+#define OUROBOROS_IPCPD_UNICAST_CA_OPS_H
+
+#include "ca.h"
+
+struct ca_ops {
+ void * (* ctx_create)(void);
+
+ void (* ctx_destroy)(void * ctx);
+
+ ca_wnd_t (* ctx_update_snd)(void * ctx,
+ size_t len);
+
+ bool (* ctx_update_rcv)(void * ctx,
+ size_t len,
+ uint8_t ecn,
+ uint16_t * ece);
+
+ void (* ctx_update_ece)(void * ctx,
+ uint16_t ece);
+
+ void (* wnd_wait)(ca_wnd_t wnd);
+
+ int (* calc_ecn)(int fd,
+ uint8_t * ecn,
+ qoscube_t qc,
+ size_t len);
+
+ /* Optional, can be NULL */
+ ssize_t (* print_stats)(void * ctx,
+ char * buf,
+ size_t len);
+
+};
+
+#endif /* OUROBOROS_IPCPD_UNICAST_CA_OPS_H */