zebra: add tc netlink and dplane ops

This commit implements necessary netlink encoders for traffic control
including QDISC, TCLASS and TFILTER, and adds basic dplane operations.

Co-authored-by: Stephen Worley <sworley@nvidia.com>
Signed-off-by: Siger Yang <siger.yang@outlook.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/zebra/tc_netlink.h b/zebra/tc_netlink.h
new file mode 100644
index 000000000..2190bca4f
--- /dev/null
+++ b/zebra/tc_netlink.h
@@ -0,0 +1,62 @@
+/*
+ * Zebra Traffic Control (TC) interaction with the kernel using netlink.
+ *
+ * Copyright (C) 2022 Shichu Yang
+ *
+ * This file is part of FRR.
+ *
+ * FRR is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * FRR 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 FRR; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef _ZEBRA_TC_NETLINK_H
+#define _ZEBRA_TC_NETLINK_H
+
+#ifdef HAVE_NETLINK
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Represent a prefixed address in flower filter */
+
+struct inet_prefix {
+	uint16_t flags;
+	uint16_t bytelen;
+	uint16_t bitlen;
+	uint16_t family;
+	uint32_t data[64];
+};
+
+enum {
+	PREFIXLEN_SPECIFIED = (1 << 0),
+	ADDRTYPE_INET = (1 << 1),
+	ADDRTYPE_UNSPEC = (1 << 2),
+	ADDRTYPE_MULTI = (1 << 3),
+
+	ADDRTYPE_INET_UNSPEC = ADDRTYPE_INET | ADDRTYPE_UNSPEC,
+	ADDRTYPE_INET_MULTI = ADDRTYPE_INET | ADDRTYPE_MULTI
+};
+
+extern enum netlink_msg_status
+netlink_put_tc_update_msg(struct nl_batch *bth, struct zebra_dplane_ctx *ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAVE_NETLINK */
+
+#endif /* _ZEBRA_TC_NETLINK_H */