libbpf: Merge the Berkeley Packet Filter library.

* Makefile (lib-subdirs): Add new library.
* NEWS: Update.
* libbpf/Makefile: New file.
* libbpf/bpf_impl.c: Likewise.
* libbpf/bpf_impl.h: Likewise.
* libbpf/queue.c: Likewise.
* libbpf/queue.h: Likewise.
* libbpf/util.h: Likewise.

The Berkeley Packet Filter implementation has been extracted from the
Mach kernel by Zheng Da.  This merges his work into the main
repository.

1 files changed, 91 insertions, 0 deletions

diff --git a/libbpf/util.h b/libbpf/util.h
new file mode 100644
index 00000000..b062638d
--- /dev/null
+++ b/libbpf/util.h
@@ -0,0 +1,91 @@
+/*
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   Written by Zheng Da.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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.
+
+   The GNU Hurd 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 the GNU Hurd; see the file COPYING.  If not, write to
+   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <stdio.h>
+#include <execinfo.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/ip.h>
+
+#include <mach.h>
+
+#ifdef DEBUG
+
+#define debug(format, ...) do				\
+{							\
+  char buf[1024];                                       \
+  snprintf (buf, 1024, "multiplexer: %s: %s\n", __func__, format);       \
+  fprintf (stderr , buf, ## __VA_ARGS__);		\
+  fflush (stderr);					\
+} while (0)
+
+#else
+
+#define debug(format, ...) do {} while (0)
+
+#endif
+
+#define print_backtrace() do				\
+{							\
+  size_t size;						\
+  void *array[30];					\
+  size = backtrace (array, sizeof (array));		\
+  debug ("the depth of the stack: %d", size);		\
+  backtrace_symbols_fd(array, size, fileno (stderr));	\
+} while (0)
+
+#define ETH_ALEN 6		/* Octets in one ethernet addr	 */
+
+struct ethhdr
+{
+  unsigned char	h_dest[ETH_ALEN];	/* destination eth addr	*/
+  unsigned char	h_source[ETH_ALEN];	/* source ether addr	*/
+  unsigned short h_proto;		/* packet type ID field	*/
+};
+
+static inline void
+print_pack (char *packet, int len)
+{
+#ifdef DEBUG
+#define ETH_P_IP 0x0800
+  struct ethhdr *ethh = (struct ethhdr *) packet;
+  struct iphdr *iph = (struct iphdr *)(ethh + 1);
+  char src_str[INET_ADDRSTRLEN];
+  char dst_str[INET_ADDRSTRLEN];
+  if (ntohs (ethh->h_proto) == ETH_P_IP
+      && len >= sizeof (struct ethhdr) + sizeof (struct iphdr))
+    {
+      debug ("multiplexer: get a IP packet from %s to %s\n",
+	     inet_ntop (AF_INET, &iph->saddr, src_str, INET_ADDRSTRLEN),
+	     inet_ntop (AF_INET, &iph->daddr, dst_str, INET_ADDRSTRLEN));
+    }
+  else
+    {
+      debug ("multiplexer: get a non-IP packet\n");
+    }
+#endif
+}
+
+#endif