Add multiple build support styles

* Add RPM and DEB packaging targets (using CPack from CMake) to build
  binary packages for Fedora and Ubuntu targets.
* Add Docker build scripts for each of the above that run the build in
  the right environment (assuming docker is available).
 - In Ubuntu, build against the LLVM 3.7 nightly snapshots
 - In Fedora, build against LLVM 3.7 from git (takes longer)
* Depending on packages installed on the build machine, it may be
  possible to cross-package for other targets without invoking Docker.
* Re-introduce src/cc/compat directory to keep the build stable for the
  time being. Similarly, it was necessary to #define some ugly constants
  that should eventually show up in libc.
* Add a few simple version checks to allow a partially working (really
  tracing only) libbcc in 4.1 kernels.

TODO (followup commit): Re-work the READMEs
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

.dockerignore

+Dockerfile*
+build
+.*.swp

CMakeLists.txt

@@ -2,8 +2,8 @@
 # Licensed under the Apache License, Version 2.0 (the "License")
 cmake_minimum_required(VERSION 2.8.7)
 
-project(bpf-tools)
-set(CMAKE_BUILD_TYPE Debug)
+project(bcc)
+set(CMAKE_BUILD_TYPE Release)
 
 enable_testing()
 
@@ -21,7 +21,7 @@ message(STATUS "Found LLVM: ${LLVM_INCLUDE_DIRS}")
 
 # clang is linked as a library, but the library path searching is
 # primitively supported, unlike libLLVM
-set(CLANG_SEARCH "/opt/local/llvm/lib;${LLVM_LIBRARY_DIRS}")
+set(CLANG_SEARCH "/opt/local/llvm/lib;/usr/lib/llvm-3.7/lib;${LLVM_LIBRARY_DIRS}")
 find_library(libclangAnalysis NAMES clangAnalysis HINTS ${CLANG_SEARCH})
 find_library(libclangAST NAMES clangAST HINTS ${CLANG_SEARCH})
 find_library(libclangBasic NAMES clangBasic HINTS ${CLANG_SEARCH})
@@ -48,3 +48,17 @@ endif()
 add_subdirectory(scripts)
 add_subdirectory(src)
 add_subdirectory(tests)
+
+set(CPACK_PACKAGE_NAME "libbcc")
+set(CPACK_PACKAGE_VERSION "${REVISION}")
+set(CPACK_PACKAGE_CONTACT "Brenden Blanco <bblanco@plumgrid.com")
+if(EXISTS "/etc/redhat-release")
+  set(CPACK_GENERATOR "RPM")
+else()
+  set(CPACK_GENERATOR "DEB")
+endif()
+set(CPACK_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
+set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "amd64")
+set(CPACK_DEBIAN_PACKAGE_DEPENDS "libc6, libstdc++6, python")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Shared Library for BPF Compiler Collection (BCC)")
+include(CPack)

Dockerfile.fedora

+# File to be used for building an Ubuntu .deb
+
+FROM fedora
+
+MAINTAINER Brenden Blanco <bblanco@plumgrid.com>
+
+RUN dnf -y install @rpm-development-tools @c-development @development-tools cmake libstdc++-static
+
+WORKDIR /root
+RUN git clone https://github.com/llvm-mirror/llvm.git
+RUN git clone https://github.com/llvm-mirror/clang.git llvm/tools/clang
+RUN mkdir -p /root/llvm/build
+WORKDIR /root/llvm/build
+RUN cmake .. -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="ARM;CppBackend;X86;BPF"
+RUN make -j$(grep -c ^process /proc/cpuinfo)
+
+RUN mkdir -p /root/bcc/build
+COPY ./ /root/bcc/
+WORKDIR /root/bcc/build
+RUN cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_PREFIX_PATH=/root/llvm/build
+RUN make -j$(grep -c ^process /proc/cpuinfo) package

Dockerfile.ubuntu

+# File to be used for building an Ubuntu .deb
+
+FROM ubuntu:trusty
+
+MAINTAINER Brenden Blanco <bblanco@plumgrid.com>
+
+RUN apt-get -y install wget
+RUN printf "deb http://llvm.org/apt/trusty/ llvm-toolchain-trusty main\ndeb-src http://llvm.org/apt/trusty/ llvm-toolchain-trusty main\n" > /etc/apt/sources.list.d/llvm.list
+RUN wget -q -O - http://llvm.org/apt/llvm-snapshot.gpg.key | apt-key add -
+RUN apt-get -y update
+
+RUN apt-get -y install bison build-essential cmake flex git libedit-dev python zlib1g-dev
+RUN apt-get -y install libllvm3.7 llvm-3.7-dev libclang-3.7-dev
+
+RUN mkdir -p /root/bcc/build
+COPY ./ /root/bcc/
+WORKDIR /root/bcc/build
+RUN cmake .. -DCMAKE_INSTALL_PREFIX=/usr
+RUN make -j$(grep -c ^process /proc/cpuinfo) package

scripts/CMakeLists.txt

@@ -5,15 +5,17 @@ string(SUBSTRING "${GIT_SHA1}" 0 8 GIT_SHA1_SHORT)
 git_describe(GIT_DESCRIPTION)
 git_describe(GIT_TAG_LAST "--abbrev=0")
 git_get_exact_tag(GIT_TAG_EXACT)
-string(SUBSTRING "${GIT_TAG_LAST}-${GIT_SHA1_SHORT}" 1 -1 REVISION)
-if(GIT_TAG_EXACT)
-  string(SUBSTRING "${GIT_TAG_EXACT}" 1 -1 REVISION)
-  message(STATUS "Currently on Git tag ${GIT_TAG_EXACT}")
-else ()
-  message(STATUS "Latest recognized Git tag is ${GIT_TAG_LAST}")
-  set(GIT_TAG_EXACT "")
+if(NOT REVISION)
+  string(SUBSTRING "${GIT_TAG_LAST}-${GIT_SHA1_SHORT}" 1 -1 REVISION)
+  if(GIT_TAG_EXACT)
+    string(SUBSTRING "${GIT_TAG_EXACT}" 1 -1 REVISION)
+    message(STATUS "Currently on Git tag ${GIT_TAG_EXACT}")
+  else ()
+    message(STATUS "Latest recognized Git tag is ${GIT_TAG_LAST}")
+    set(GIT_TAG_EXACT "")
+  endif()
+  message(STATUS "Git HEAD is ${GIT_SHA1}")
 endif()
-message(STATUS "Git HEAD is ${GIT_SHA1}")
 
 # strip leading 'v', and make unique for the tag
 message(STATUS "Revision is ${REVISION}")

scripts/bpf_demo.ks.erb

@@ -117,7 +117,6 @@ numcpu=$(grep -c ^processor /proc/cpuinfo)
 git clone https://github.com/iovisor/bcc.git
 mkdir bcc/build/
 cd bcc/build/
-git checkout bblanco_dev
 export PATH=/opt/local/llvm/bin:$PATH
 cmake .. -DCMAKE_INSTALL_PREFIX=/usr
 make -j$numcpu

src/cc/CMakeLists.txt

@@ -3,6 +3,8 @@
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${LLVM_INCLUDE_DIRS})
+# todo: if check for kernel version
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/compat)
 add_definitions(${LLVM_DEFINITIONS})
 
 BISON_TARGET(Parser parser.yy ${CMAKE_CURRENT_BINARY_DIR}/parser.yy.cc COMPILE_FLAGS "-o parser.yy.cc -v --debug")

src/cc/b_frontend_action.cc

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 #include <linux/bpf.h>
+#include <linux/version.h>
 
 #include <clang/AST/ASTConsumer.h>
 #include <clang/AST/ASTContext.h>
@@ -373,8 +374,10 @@ bool BTypeVisitor::VisitVarDecl(VarDecl *Decl) {
       map_type = BPF_MAP_TYPE_HASH;
     else if (A->getName() == "maps/array")
       map_type = BPF_MAP_TYPE_ARRAY;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
     else if (A->getName() == "maps/prog")
       map_type = BPF_MAP_TYPE_PROG_ARRAY;
+#endif
     table.fd = bpf_create_map(map_type, table.key_size, table.leaf_size, table.max_entries);
     if (table.fd < 0) {
       llvm::errs() << "error: could not open bpf fd\n";

src/cc/compat/linux/bpf.h

+/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#ifndef _UAPI__LINUX_BPF_H__
+#define _UAPI__LINUX_BPF_H__
+
+#include <linux/types.h>
+#include <linux/bpf_common.h>
+
+/* Extended instruction set based on top of classic BPF */
+
+/* instruction classes */
+#define BPF_ALU64	0x07	/* alu mode in double word width */
+
+/* ld/ldx fields */
+#define BPF_DW		0x18	/* double word */
+#define BPF_XADD	0xc0	/* exclusive add */
+
+/* alu/jmp fields */
+#define BPF_MOV		0xb0	/* mov reg to reg */
+#define BPF_ARSH	0xc0	/* sign extending arithmetic shift right */
+
+/* change endianness of a register */
+#define BPF_END		0xd0	/* flags for endianness conversion: */
+#define BPF_TO_LE	0x00	/* convert to little-endian */
+#define BPF_TO_BE	0x08	/* convert to big-endian */
+#define BPF_FROM_LE	BPF_TO_LE
+#define BPF_FROM_BE	BPF_TO_BE
+
+#define BPF_JNE		0x50	/* jump != */
+#define BPF_JSGT	0x60	/* SGT is signed '>', GT in x86 */
+#define BPF_JSGE	0x70	/* SGE is signed '>=', GE in x86 */
+#define BPF_CALL	0x80	/* function call */
+#define BPF_EXIT	0x90	/* function return */
+
+/* Register numbers */
+enum {
+	BPF_REG_0 = 0,
+	BPF_REG_1,
+	BPF_REG_2,
+	BPF_REG_3,
+	BPF_REG_4,
+	BPF_REG_5,
+	BPF_REG_6,
+	BPF_REG_7,
+	BPF_REG_8,
+	BPF_REG_9,
+	BPF_REG_10,
+	__MAX_BPF_REG,
+};
+
+/* BPF has 10 general purpose 64-bit registers and stack frame. */
+#define MAX_BPF_REG	__MAX_BPF_REG
+
+struct bpf_insn {
+	__u8	code;		/* opcode */
+	__u8	dst_reg:4;	/* dest register */
+	__u8	src_reg:4;	/* source register */
+	__s16	off;		/* signed offset */
+	__s32	imm;		/* signed immediate constant */
+};
+
+/* BPF syscall commands */
+enum bpf_cmd {
+	/* create a map with given type and attributes
+	 * fd = bpf(BPF_MAP_CREATE, union bpf_attr *, u32 size)
+	 * returns fd or negative error
+	 * map is deleted when fd is closed
+	 */
+	BPF_MAP_CREATE,
+
+	/* lookup key in a given map
+	 * err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size)
+	 * Using attr->map_fd, attr->key, attr->value
+	 * returns zero and stores found elem into value
+	 * or negative error
+	 */
+	BPF_MAP_LOOKUP_ELEM,
+
+	/* create or update key/value pair in a given map
+	 * err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size)
+	 * Using attr->map_fd, attr->key, attr->value, attr->flags
+	 * returns zero or negative error
+	 */
+	BPF_MAP_UPDATE_ELEM,
+
+	/* find and delete elem by key in a given map
+	 * err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size)
+	 * Using attr->map_fd, attr->key
+	 * returns zero or negative error
+	 */
+	BPF_MAP_DELETE_ELEM,
+
+	/* lookup key in a given map and return next key
+	 * err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size)
+	 * Using attr->map_fd, attr->key, attr->next_key
+	 * returns zero and stores next key or negative error
+	 */
+	BPF_MAP_GET_NEXT_KEY,
+
+	/* verify and load eBPF program
+	 * prog_fd = bpf(BPF_PROG_LOAD, union bpf_attr *attr, u32 size)
+	 * Using attr->prog_type, attr->insns, attr->license
+	 * returns fd or negative error
+	 */
+	BPF_PROG_LOAD,
+};
+
+enum bpf_map_type {
+	BPF_MAP_TYPE_UNSPEC,
+	BPF_MAP_TYPE_HASH,
+	BPF_MAP_TYPE_ARRAY,
+	BPF_MAP_TYPE_PROG_ARRAY,
+};
+
+enum bpf_prog_type {
+	BPF_PROG_TYPE_UNSPEC,
+	BPF_PROG_TYPE_SOCKET_FILTER,
+	BPF_PROG_TYPE_KPROBE,
+	BPF_PROG_TYPE_SCHED_CLS,
+	BPF_PROG_TYPE_SCHED_ACT,
+};
+
+#define BPF_PSEUDO_MAP_FD	1
+
+/* flags for BPF_MAP_UPDATE_ELEM command */
+#define BPF_ANY		0 /* create new element or update existing */
+#define BPF_NOEXIST	1 /* create new element if it didn't exist */
+#define BPF_EXIST	2 /* update existing element */
+
+union bpf_attr {
+	struct { /* anonymous struct used by BPF_MAP_CREATE command */
+		__u32	map_type;	/* one of enum bpf_map_type */
+		__u32	key_size;	/* size of key in bytes */
+		__u32	value_size;	/* size of value in bytes */
+		__u32	max_entries;	/* max number of entries in a map */
+	};
+
+	struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
+		__u32		map_fd;
+		__aligned_u64	key;
+		union {
+			__aligned_u64 value;
+			__aligned_u64 next_key;
+		};
+		__u64		flags;
+	};
+
+	struct { /* anonymous struct used by BPF_PROG_LOAD command */
+		__u32		prog_type;	/* one of enum bpf_prog_type */
+		__u32		insn_cnt;
+		__aligned_u64	insns;
+		__aligned_u64	license;
+		__u32		log_level;	/* verbosity level of verifier */
+		__u32		log_size;	/* size of user buffer */
+		__aligned_u64	log_buf;	/* user supplied buffer */
+		__u32		kern_version;	/* checked when prog_type=kprobe */
+	};
+} __attribute__((aligned(8)));
+
+/* integer value in 'imm' field of BPF_CALL instruction selects which helper
+ * function eBPF program intends to call
+ */
+enum bpf_func_id {
+	BPF_FUNC_unspec,
+	BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */
+	BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */
+	BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */
+	BPF_FUNC_probe_read,      /* int bpf_probe_read(void *dst, int size, void *src) */
+	BPF_FUNC_ktime_get_ns,    /* u64 bpf_ktime_get_ns(void) */
+	BPF_FUNC_trace_printk,    /* int bpf_trace_printk(const char *fmt, int fmt_size, ...) */
+	BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */
+	BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */
+
+	/**
+	 * skb_store_bytes(skb, offset, from, len, flags) - store bytes into packet
+	 * @skb: pointer to skb
+	 * @offset: offset within packet from skb->mac_header
+	 * @from: pointer where to copy bytes from
+	 * @len: number of bytes to store into packet
+	 * @flags: bit 0 - if true, recompute skb->csum
+	 *         other bits - reserved
+	 * Return: 0 on success
+	 */
+	BPF_FUNC_skb_store_bytes,
+
+	/**
+	 * l3_csum_replace(skb, offset, from, to, flags) - recompute IP checksum
+	 * @skb: pointer to skb
+	 * @offset: offset within packet where IP checksum is located
+	 * @from: old value of header field
+	 * @to: new value of header field
+	 * @flags: bits 0-3 - size of header field
+	 *         other bits - reserved
+	 * Return: 0 on success
+	 */
+	BPF_FUNC_l3_csum_replace,
+
+	/**
+	 * l4_csum_replace(skb, offset, from, to, flags) - recompute TCP/UDP checksum
+	 * @skb: pointer to skb
+	 * @offset: offset within packet where TCP/UDP checksum is located
+	 * @from: old value of header field
+	 * @to: new value of header field
+	 * @flags: bits 0-3 - size of header field
+	 *         bit 4 - is pseudo header
+	 *         other bits - reserved
+	 * Return: 0 on success
+	 */
+	BPF_FUNC_l4_csum_replace,
+
+	/**
+	 * bpf_tail_call(ctx, prog_array_map, index) - jump into another BPF program
+	 * @ctx: context pointer passed to next program
+	 * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
+	 * @index: index inside array that selects specific program to run
+	 * Return: 0 on success
+	 */
+	BPF_FUNC_tail_call,
+
+	/**
+	 * bpf_clone_redirect(skb, ifindex, flags) - redirect to another netdev
+	 * @skb: pointer to skb
+	 * @ifindex: ifindex of the net device
+	 * @flags: bit 0 - if set, redirect to ingress instead of egress
+	 *         other bits - reserved
+	 * Return: 0 on success
+	 */
+	BPF_FUNC_clone_redirect,
+
+	/**
+	 * u64 bpf_get_current_pid_tgid(void)
+	 * Return: current->tgid << 32 | current->pid
+	 */
+	BPF_FUNC_get_current_pid_tgid,
+
+	/**
+	 * u64 bpf_get_current_uid_gid(void)
+	 * Return: current_gid << 32 | current_uid
+	 */
+	BPF_FUNC_get_current_uid_gid,
+
+	/**
+	 * bpf_get_current_comm(char *buf, int size_of_buf)
+	 * stores current->comm into buf
+	 * Return: 0 on success
+	 */
+	BPF_FUNC_get_current_comm,
+	__BPF_FUNC_MAX_ID,
+};
+
+/* user accessible mirror of in-kernel sk_buff.
+ * new fields can only be added to the end of this structure
+ */
+struct __sk_buff {
+	__u32 len;
+	__u32 pkt_type;
+	__u32 mark;
+	__u32 queue_mapping;
+	__u32 protocol;
+	__u32 vlan_present;
+	__u32 vlan_tci;
+	__u32 vlan_proto;
+	__u32 priority;
+	__u32 ingress_ifindex;
+	__u32 ifindex;
+	__u32 tc_index;
+	__u32 cb[5];
+};
+
+#endif /* _UAPI__LINUX_BPF_H__ */

src/cc/compat/linux/bpf_common.h

+#ifndef _UAPI__LINUX_BPF_COMMON_H__
+#define _UAPI__LINUX_BPF_COMMON_H__
+
+/* Instruction classes */
+#define BPF_CLASS(code) ((code) & 0x07)
+#define		BPF_LD		0x00
+#define		BPF_LDX		0x01
+#define		BPF_ST		0x02
+#define		BPF_STX		0x03
+#define		BPF_ALU		0x04
+#define		BPF_JMP		0x05
+#define		BPF_RET		0x06
+#define		BPF_MISC        0x07
+
+/* ld/ldx fields */
+#define BPF_SIZE(code)  ((code) & 0x18)
+#define		BPF_W		0x00
+#define		BPF_H		0x08
+#define		BPF_B		0x10
+#define BPF_MODE(code)  ((code) & 0xe0)
+#define		BPF_IMM		0x00
+#define		BPF_ABS		0x20
+#define		BPF_IND		0x40
+#define		BPF_MEM		0x60
+#define		BPF_LEN		0x80
+#define		BPF_MSH		0xa0
+
+/* alu/jmp fields */
+#define BPF_OP(code)    ((code) & 0xf0)
+#define		BPF_ADD		0x00
+#define		BPF_SUB		0x10
+#define		BPF_MUL		0x20
+#define		BPF_DIV		0x30
+#define		BPF_OR		0x40
+#define		BPF_AND		0x50
+#define		BPF_LSH		0x60
+#define		BPF_RSH		0x70
+#define		BPF_NEG		0x80
+#define		BPF_MOD		0x90
+#define		BPF_XOR		0xa0
+
+#define		BPF_JA		0x00
+#define		BPF_JEQ		0x10
+#define		BPF_JGT		0x20
+#define		BPF_JGE		0x30
+#define		BPF_JSET        0x40
+#define BPF_SRC(code)   ((code) & 0x08)
+#define		BPF_K		0x00
+#define		BPF_X		0x08
+
+#ifndef BPF_MAXINSNS
+#define BPF_MAXINSNS 4096
+#endif
+
+#endif /* _UAPI__LINUX_BPF_COMMON_H__ */

src/cc/export/helpers.h

@@ -63,6 +63,7 @@ static u64 (*bpf_ktime_get_ns)(void) =
 static int (*bpf_trace_printk_)(const char *fmt, u64 fmt_size, ...) =
 	(void *) BPF_FUNC_trace_printk;
 int bpf_trace_printk(const char *fmt, ...) asm("llvm.bpf.extra");
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
 static u64 (*bpf_clone_redirect)(void *ctx, u64 ifindex, u64 flags) =
 	(void *) BPF_FUNC_clone_redirect;
 static u64 (*bpf_get_smp_processor_id)(void) =
@@ -76,6 +77,7 @@ static int (*bpf_get_current_comm)(void *buf, int buf_size) =
 static void bpf_tail_call_(u64 map_fd, void *ctx, int index) {
   ((void (*)(void *, u64, int))BPF_FUNC_tail_call)(ctx, map_fd, index);
 }
+#endif
 
 /* llvm builtin functions that eBPF C program may use to
  * emit BPF_LD_ABS and BPF_LD_IND instructions

src/cc/libbpf.c

@@ -34,6 +34,24 @@
 
 #include "libbpf.h"
 
+// TODO: remove these defines when linux-libc-dev exports them properly
+
+#ifndef __NR_bpf
+#define __NR_bpf 321
+#endif
+
+#ifndef SO_ATTACH_BPF
+#define SO_ATTACH_BPF 50
+#endif
+
+#ifndef PERF_EVENT_IOC_SET_BPF
+#define PERF_EVENT_IOC_SET_BPF _IOW('$', 8, __u32)
+#endif
+
+#ifndef PERF_FLAG_FD_CLOEXEC
+#define PERF_FLAG_FD_CLOEXEC (1UL << 3)
+#endif
+
 static __u64 ptr_to_u64(void *ptr)
 {
   return (__u64) (unsigned long) ptr;

src/python/CMakeLists.txt

@@ -16,5 +16,9 @@ add_custom_command(OUTPUT ${PIP_INSTALLABLE}
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bpf/__init__.py ${CMAKE_CURRENT_BINARY_DIR}/setup.py
   )
 add_custom_target(bpf_py ALL DEPENDS ${PIP_INSTALLABLE})
-install(CODE "execute_process(COMMAND python setup.py install -f
+
+if(EXISTS "/etc/debian_version")
+  set(PYTHON_FLAGS "${PYTHON_FLAGS} --install-layout deb")
+endif()
+install(CODE "execute_process(COMMAND python setup.py install -f ${PYTHON_FLAGS}
   --prefix=${CMAKE_INSTALL_PREFIX} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})")

src/python/bpf/__init__.py

@@ -16,8 +16,9 @@ import atexit
 from collections import MutableMapping
 import ctypes as ct
 import json
-from past.builtins import basestring
 import os
+import sys
+basestring = (unicode if sys.version_info[0] < 3 else str)
 
 lib = ct.CDLL("libbpfprog.so")
 
@@ -187,22 +188,22 @@ class BPF(object):
         return fn
 
     str2ctype = {
-        "_Bool": ct.c_bool,
-        "char": ct.c_char,
-        "wchar_t": ct.c_wchar,
-        "char": ct.c_byte,
-        "unsigned char": ct.c_ubyte,
-        "short": ct.c_short,
-        "unsigned short": ct.c_ushort,
-        "int": ct.c_int,
-        "unsigned int": ct.c_uint,
-        "long": ct.c_long,
-        "unsigned long": ct.c_ulong,
-        "long long": ct.c_longlong,
-        "unsigned long long": ct.c_ulonglong,
-        "float": ct.c_float,
-        "double": ct.c_double,
-        "long double": ct.c_longdouble
+        u"_Bool": ct.c_bool,
+        u"char": ct.c_char,
+        u"wchar_t": ct.c_wchar,
+        u"char": ct.c_byte,
+        u"unsigned char": ct.c_ubyte,
+        u"short": ct.c_short,
+        u"unsigned short": ct.c_ushort,
+        u"int": ct.c_int,
+        u"unsigned int": ct.c_uint,
+        u"long": ct.c_long,
+        u"unsigned long": ct.c_ulong,
+        u"long long": ct.c_longlong,
+        u"unsigned long long": ct.c_ulonglong,
+        u"float": ct.c_float,
+        u"double": ct.c_double,
+        u"long double": ct.c_longdouble
     }
     @staticmethod
     def _decode_table_type(desc):

src/python/setup.py.in

 # Copyright (c) PLUMgrid, Inc.
 # Licensed under the Apache License, Version 2.0 (the "License")
 from distutils.core import setup
+import os
+import sys
+
+if os.environ.get('DESTDIR'):
+    sys.argv += ['--root', os.environ['DESTDIR']]
 
 setup(name='bpf',
       version='@REVISION@',
@@ -9,5 +14,4 @@ setup(name='bpf',
       author_email='bblanco@plumgrid.com',
       url='http://plumgrid.com',
       packages=['bpf'],
-      platforms=['Linux'],
-      install_requires=['future'])
+      platforms=['Linux'])