Add support for remote target devices via BPFd

SPECS/bcc+clang.spec

@@ -79,6 +79,12 @@ Requires: python-bcc
 %description -n bcc-tools
 Command line tools for BPF Compiler Collection (BCC)
 
+%package -n bpfd
+Summary: Proxy daemon for remote target devices
+Requires: libbcc = %{version}-%{release}
+%description -n bpfd
+Proxy daemon for remote target devices
+
 %files -n python-bcc
 %{python_sitelib}/bcc*
 
@@ -99,3 +105,6 @@ Command line tools for BPF Compiler Collection (BCC)
 /usr/share/bcc/introspection/*
 /usr/share/bcc/tools/*
 /usr/share/bcc/man/*
+
+%files -n bpfd
+/usr/bin/bpfd

SPECS/bcc.spec

@@ -91,6 +91,12 @@ Requires: python-bcc = %{version}-%{release}
 %description -n bcc-tools
 Command line tools for BPF Compiler Collection (BCC)
 
+%package -n bpfd
+Summary: Proxy daemon for remote target devices
+Requires: libbcc = %{version}-%{release}
+%description -n bpfd
+Proxy daemon for remote target devices
+
 %files -n libbcc
 /usr/lib64/*
 /usr/include/bcc/*
@@ -117,6 +123,9 @@ Command line tools for BPF Compiler Collection (BCC)
 /usr/share/bcc/tools/*
 /usr/share/bcc/man/*
 
+%files -n bpfd
+/usr/bin/bpfd
+
 %post -n libbcc -p /sbin/ldconfig
 
 %postun -n libbcc -p /sbin/ldconfig

debian/bpfd.install

@@ -0,0 +1 @@
+usr/bin/bpfd

debian/control

@@ -43,3 +43,8 @@ Package: bcc-lua
 Architecture: all
 Depends: libbcc
 Description: Standalone tool to run BCC tracers written in Lua
+
+Package: bpfd
+Architecture: all
+Depends: libbcc
+Description: Proxy daemon for remote target devices

debian/libbcc.install

@@ -1,3 +1,4 @@
 usr/include/bcc/*
 usr/lib/*/libbcc*
+usr/lib/*/libbpf*
 usr/lib/*/pkgconfig/libbcc.pc

src/cc/CMakeLists.txt

@@ -81,6 +81,7 @@ if(ENABLE_USDT)
 endif()
 
 add_subdirectory(frontends)
+add_subdirectory(bpfd)
 
 # Link against LLVM libraries
 target_link_libraries(bcc-shared ${bcc_common_libs_for_s})

src/cc/bpf_common.cc

@@ -17,6 +17,14 @@
 #include "bpf_module.h"
 
 extern "C" {
+
+// This stores the appropriate callback function to invoke when there is a
+// need to create a map. This is done so that the Python interface can pass
+// custom callbacks to create maps for situations wherein the map creation
+// functions provided by libbbc are not sufficient (e.g. when there is a need
+// to create maps on remote target devices).
+bpf_create_map_cb_t bpf_create_map_cb;
+
 void * bpf_module_create_b(const char *filename, const char *proto_filename, unsigned flags) {
   auto mod = new ebpf::BPFModule(flags);
   if (mod->load_b(filename, proto_filename) != 0) {
@@ -26,7 +34,11 @@ void * bpf_module_create_b(const char *filename, const char *proto_filename, uns
   return mod;
 }
 
-void * bpf_module_create_c(const char *filename, unsigned flags, const char *cflags[], int ncflags) {
+void *bpf_module_create_c(const char *filename, unsigned flags,
+                          const char *cflags[], int ncflags,
+                          bpf_create_map_cb_t map_cb) {
+  bpf_create_map_cb = map_cb;
+
   auto mod = new ebpf::BPFModule(flags);
   if (mod->load_c(filename, cflags, ncflags) != 0) {
     delete mod;
@@ -35,7 +47,11 @@ void * bpf_module_create_c(const char *filename, unsigned flags, const char *cfl
   return mod;
 }
 
-void * bpf_module_create_c_from_string(const char *text, unsigned flags, const char *cflags[], int ncflags) {
+void *bpf_module_create_c_from_string(const char *text, unsigned flags,
+                                      const char *cflags[], int ncflags,
+                                      bpf_create_map_cb_t map_cb) {
+  bpf_create_map_cb = map_cb;
+
   auto mod = new ebpf::BPFModule(flags);
   if (mod->load_string(text, cflags, ncflags) != 0) {
     delete mod;

src/cc/bpf_common.h

@@ -24,9 +24,14 @@
 extern "C" {
 #endif
 
+typedef void (*bpf_create_map_cb_t)(void *data);
 void * bpf_module_create_b(const char *filename, const char *proto_filename, unsigned flags);
-void * bpf_module_create_c(const char *filename, unsigned flags, const char *cflags[], int ncflags);
-void * bpf_module_create_c_from_string(const char *text, unsigned flags, const char *cflags[], int ncflags);
+void *bpf_module_create_c(const char *filename, unsigned flags,
+                          const char *cflags[], int ncflags,
+                          bpf_create_map_cb_t map_cb);
+void *bpf_module_create_c_from_string(const char *text, unsigned flags,
+                                      const char *cflags[], int ncflags,
+                                      bpf_create_map_cb_t map_cb);
 void bpf_module_destroy(void *program);
 char * bpf_module_license(void *program);
 unsigned bpf_module_kern_version(void *program);

src/cc/bpfd/CMakeLists.txt

@@ -0,0 +1,8 @@
+# Copyright (c) Jazel Canseco, 2018
+# Licensed under the Apache License, Version 2.0 (the "License")
+
+add_executable(bpfd bpfd.c base64.c remote_perf_reader.c utils.c cmd_parsers.c)
+target_link_libraries(bpfd bpf-shared)
+target_link_libraries(bpfd bcc-shared)
+
+install(TARGETS bpfd RUNTIME DESTINATION bin)