BMP protocol support

Initial implementation of a basic subset of the BMP (BGP Monitoring
Protocol, RFC 7854) from Akamai team. Submitted for further review
and improvement.

1 files changed, 78 insertions, 0 deletions

diff --git a/proto/bmp/buffer.h b/proto/bmp/buffer.h
new file mode 100644
index 00000000..07eb4e9c
--- /dev/null
+++ b/proto/bmp/buffer.h
@@ -0,0 +1,78 @@
+/*
+ *	BIRD -- The BGP Monitoring Protocol (BMP)
+ *
+ *	(c) 2020 Akamai Technologies, Inc. (Pawel Maslanka, pmaslank@akamai.com)
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_BMP_BUFFER_H_
+#define _BIRD_BMP_BUFFER_H_
+
+#include "proto/bmp/bmp.h"
+#include "proto/bmp/utils.h"
+
+#include <stdlib.h>
+
+#include "lib/resource.h"
+
+buffer
+bmp_buffer_alloc(pool *ppool, const size_t n);
+
+void
+bmp_buffer_free(buffer *buf);
+
+static inline void
+bmp_buffer_flush(buffer *buf)
+{
+  buf->pos = buf->start;
+}
+
+static inline size_t
+bmp_buffer_size(const buffer *buf)
+{
+  return buf->end - buf->start;
+}
+
+static inline size_t
+bmp_buffer_avail(const buffer *buf)
+{
+  return buf->end - buf->pos;
+}
+
+static inline size_t
+bmp_buffer_pos(const buffer *buf)
+{
+  return buf->pos - buf->start;
+}
+
+static inline byte *
+bmp_buffer_data(const buffer *buf)
+{
+  return buf->start;
+}
+
+void
+bmp_buffer_need(buffer *buf, const size_t n);
+
+// Idea for following macros has been taken from |proto/mrt/mrt.c|
+#define BMP_DEFINE_PUT_FUNC(S, T)                               \
+  static inline void                                            \
+  bmp_put_##S(buffer *b, const T x)                             \
+  {                                                             \
+    bmp_buffer_need(b, sizeof(T));                              \
+    put_##S(b->pos, x);                                    \
+    b->pos += sizeof(T);                                   \
+  }
+
+BMP_DEFINE_PUT_FUNC(u8, u8)
+BMP_DEFINE_PUT_FUNC(u16, u16)
+BMP_DEFINE_PUT_FUNC(u32, u32)
+BMP_DEFINE_PUT_FUNC(u64, u64)
+BMP_DEFINE_PUT_FUNC(ip4, ip4_addr)
+BMP_DEFINE_PUT_FUNC(ip6, ip6_addr)
+
+void
+bmp_put_data(buffer *buf, const void *src, const size_t n);
+
+#endif /* _BIRD_BMP_BUFFER_H_ */
\ No newline at end of file