1 files changed, 74 insertions, 0 deletions
diff --git a/pimd/pim_msdp_packet.h b/pimd/pim_msdp_packet.h
new file mode 100644
index 0000000..00324a2
--- /dev/null
+++ b/pimd/pim_msdp_packet.h
@@ -0,0 +1,74 @@
+/*
+ * IP MSDP packet helpers
+ * Copyright (C) 2016 Cumulus Networks, Inc.
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * 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; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef PIM_MSDP_PACKET_H
+#define PIM_MSDP_PACKET_H
+
+/* type and length of a single tlv can be consider packet header */
+#define PIM_MSDP_HEADER_SIZE 3
+
+/* Keepalive TLV
+ 0                   1                   2                   3
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|       4      |              3                 |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+#define PIM_MSDP_KA_TLV_MAX_SIZE PIM_MSDP_HEADER_SIZE
+
+/* Source-Active TLV (x=8, y=12xEntryCount)
+ 0 1 2 3
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|       1       |           x + y               |  Entry Count  |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                         RP Address                            |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                          Reserved             |  Sprefix Len  | \
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  \
+|                        Group Address                          |   ) z
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  /
+|                        Source Address                         | /
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+#define PIM_MSDP_SA_TLV_MAX_SIZE 9192
+#define PIM_MSDP_SA_X_SIZE 8
+#define PIM_MSDP_SA_ONE_ENTRY_SIZE 12
+#define PIM_MSDP_SA_Y_SIZE(entry_cnt) (PIM_MSDP_SA_ONE_ENTRY_SIZE * entry_cnt)
+#define PIM_MSDP_SA_ENTRY_CNT2SIZE(entry_cnt)                                  \
+	(PIM_MSDP_SA_X_SIZE + PIM_MSDP_SA_Y_SIZE(entry_cnt))
+/* SA TLV has to have atleast only one entry in it so x=8 + y=12 */
+#define PIM_MSDP_SA_TLV_MIN_SIZE PIM_MSDP_SA_ENTRY_CNT2SIZE(1)
+/* XXX: theoretically we can fix a max of 255 but that may result in packet
+ * fragmentation */
+#define PIM_MSDP_SA_MAX_ENTRY_CNT 120
+
+#define PIM_MSDP_MAX_PACKET_SIZE                                               \
+	MAX(PIM_MSDP_SA_TLV_MAX_SIZE, PIM_MSDP_KA_TLV_MAX_SIZE)
+
+#define PIM_MSDP_PKT_TYPE_STRLEN 16
+
+void pim_msdp_pkt_ka_tx(struct pim_msdp_peer *mp);
+void pim_msdp_read(struct thread *thread);
+void pim_msdp_pkt_sa_tx(struct pim_instance *pim);
+void pim_msdp_pkt_sa_tx_one(struct pim_msdp_sa *sa);
+void pim_msdp_pkt_sa_tx_to_one_peer(struct pim_msdp_peer *mp);
+void pim_msdp_pkt_sa_tx_one_to_one_peer(struct pim_msdp_peer *mp,
+					struct in_addr rp, pim_sgaddr sg);
+
+#endif