[pim] Initial pim 0.155
diff --git a/pimd/pim_msg.c b/pimd/pim_msg.c
new file mode 100644
index 0000000..76f78f8
--- /dev/null
+++ b/pimd/pim_msg.c
@@ -0,0 +1,106 @@
+/*
+ PIM for Quagga
+ Copyright (C) 2008 Everton da Silva Marques
+
+ 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
+
+ $QuaggaId: $Format:%an, %ai, %h$ $
+*/
+
+#include <zebra.h>
+
+#include "pimd.h"
+#include "pim_pim.h"
+#include "pim_msg.h"
+#include "pim_util.h"
+
+void pim_msg_build_header(char *pim_msg, int pim_msg_size,
+ uint8_t pim_msg_type)
+{
+ uint16_t checksum;
+
+ zassert(pim_msg_size >= PIM_PIM_MIN_LEN);
+
+ /*
+ * Write header
+ */
+
+ *(uint8_t *) PIM_MSG_HDR_OFFSET_VERSION(pim_msg) = (PIM_PROTO_VERSION << 4) | pim_msg_type;
+ *(uint8_t *) PIM_MSG_HDR_OFFSET_RESERVED(pim_msg) = 0;
+
+ /*
+ * Compute checksum
+ */
+
+ *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0;
+ checksum = pim_inet_checksum(pim_msg, pim_msg_size);
+ *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = checksum;
+}
+
+char *pim_msg_addr_encode_ipv4_ucast(char *buf,
+ int buf_size,
+ struct in_addr addr)
+{
+ const int ENCODED_IPV4_UCAST_SIZE = 6;
+
+ if (buf_size < ENCODED_IPV4_UCAST_SIZE) {
+ return 0;
+ }
+
+ buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
+ buf[1] = '\0'; /* native encoding */
+ *(struct in_addr *)(buf + 2) = addr;
+
+ return buf + ENCODED_IPV4_UCAST_SIZE;
+}
+
+char *pim_msg_addr_encode_ipv4_group(char *buf,
+ int buf_size,
+ struct in_addr addr)
+{
+ const int ENCODED_IPV4_GROUP_SIZE = 8;
+
+ if (buf_size < ENCODED_IPV4_GROUP_SIZE) {
+ return 0;
+ }
+
+ buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
+ buf[1] = '\0'; /* native encoding */
+ buf[2] = '\0'; /* reserved */
+ buf[3] = 32; /* mask len */
+ *(struct in_addr *)(buf + 4) = addr;
+
+ return buf + ENCODED_IPV4_GROUP_SIZE;
+}
+
+char *pim_msg_addr_encode_ipv4_source(char *buf,
+ int buf_size,
+ struct in_addr addr)
+{
+ const int ENCODED_IPV4_SOURCE_SIZE = 8;
+
+ if (buf_size < ENCODED_IPV4_SOURCE_SIZE) {
+ return 0;
+ }
+
+ buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
+ buf[1] = '\0'; /* native encoding */
+ buf[2] = '\0'; /* reserved */
+ buf[3] = 32; /* mask len */
+ *(struct in_addr *)(buf + 4) = addr;
+
+ return buf + ENCODED_IPV4_SOURCE_SIZE;
+}