sd-radv: Add Router Advertisement prefix handling

Define Router Advertisement prefix structure. Add the Prefix
Information ICMPv6 option defined in RFC 4861 to the prefix
information structure, as it will simplify sending a Prefix
Information option later on. In order to handle endianness
correctly, the structure is redefined here instead of using
the one in netinet/icmp6.h.

Add functions to create and modify prefix information and set
default values as defined in RFC 4861, Section 6.2.1.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/libsystemd-network/radv-internal.h b/src/libsystemd-network/radv-internal.h
new file mode 100644
index 0000000000..0f92c8b55c
--- /dev/null
+++ b/src/libsystemd-network/radv-internal.h
@@ -0,0 +1,48 @@
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2017 Intel Corporation. All rights reserved.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "sd-radv.h"
+
+#include "log.h"
+#include "list.h"
+#include "sparse-endian.h"
+
+struct sd_radv_prefix {
+        unsigned n_ref;
+
+        struct {
+                uint8_t type;
+                uint8_t length;
+                uint8_t prefixlen;
+                uint8_t flags;
+                be32_t valid_lifetime;
+                be32_t preferred_lifetime;
+                uint32_t reserved;
+                struct in6_addr in6_addr;
+        } _packed_ opt;
+
+        LIST_FIELDS(struct sd_radv_prefix, prefix);
+};
+
+#define log_radv_full(level, error, fmt, ...) log_internal(level, error, __FILE__, __LINE__, __func__, "RADV: " fmt, ##__VA_ARGS__)
+#define log_radv_errno(error, fmt, ...) log_radv_full(LOG_DEBUG, error, fmt, ##__VA_ARGS__)
+#define log_radv_warning_errno(error, fmt, ...) log_radv_full(LOG_WARNING, error, fmt, ##__VA_ARGS__)
+#define log_radv(fmt, ...) log_radv_errno(0, fmt, ##__VA_ARGS__)