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authorDavid S. Miller <davem@davemloft.net>2017-12-18 10:51:06 -0500
committerDavid S. Miller <davem@davemloft.net>2017-12-18 10:51:06 -0500
commit59436c9ee18d7faad0cd1875c9d8322668f98611 (patch)
tree64543535fdefc11589a24aa9c3e2bab1bd98f894 /samples
parentc30abd5e40dd863f88e26be09b6ce949145a630a (diff)
parent46df3d209db080395a98fc0875bd05e45e8f44e0 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Daniel Borkmann says: ==================== pull-request: bpf-next 2017-12-18 The following pull-request contains BPF updates for your *net-next* tree. The main changes are: 1) Allow arbitrary function calls from one BPF function to another BPF function. As of today when writing BPF programs, __always_inline had to be used in the BPF C programs for all functions, unnecessarily causing LLVM to inflate code size. Handle this more naturally with support for BPF to BPF calls such that this __always_inline restriction can be overcome. As a result, it allows for better optimized code and finally enables to introduce core BPF libraries in the future that can be reused out of different projects. x86 and arm64 JIT support was added as well, from Alexei. 2) Add infrastructure for tagging functions as error injectable and allow for BPF to return arbitrary error values when BPF is attached via kprobes on those. This way of injecting errors generically eases testing and debugging without having to recompile or restart the kernel. Tags for opting-in for this facility are added with BPF_ALLOW_ERROR_INJECTION(), from Josef. 3) For BPF offload via nfp JIT, add support for bpf_xdp_adjust_head() helper call for XDP programs. First part of this work adds handling of BPF capabilities included in the firmware, and the later patches add support to the nfp verifier part and JIT as well as some small optimizations, from Jakub. 4) The bpftool now also gets support for basic cgroup BPF operations such as attaching, detaching and listing current BPF programs. As a requirement for the attach part, bpftool can now also load object files through 'bpftool prog load'. This reuses libbpf which we have in the kernel tree as well. bpftool-cgroup man page is added along with it, from Roman. 5) Back then commit e87c6bc3852b ("bpf: permit multiple bpf attachments for a single perf event") added support for attaching multiple BPF programs to a single perf event. Given they are configured through perf's ioctl() interface, the interface has been extended with a PERF_EVENT_IOC_QUERY_BPF command in this work in order to return an array of one or multiple BPF prog ids that are currently attached, from Yonghong. 6) Various minor fixes and cleanups to the bpftool's Makefile as well as a new 'uninstall' and 'doc-uninstall' target for removing bpftool itself or prior installed documentation related to it, from Quentin. 7) Add CONFIG_CGROUP_BPF=y to the BPF kernel selftest config file which is required for the test_dev_cgroup test case to run, from Naresh. 8) Fix reporting of XDP prog_flags for nfp driver, from Jakub. 9) Fix libbpf's exit code from the Makefile when libelf was not found in the system, also from Jakub. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/Makefile4
-rwxr-xr-xsamples/bpf/test_override_return.sh15
-rw-r--r--samples/bpf/tracex7_kern.c16
-rw-r--r--samples/bpf/tracex7_user.c28
4 files changed, 63 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index adeaa1302f34..4fb944a7ecf8 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -12,6 +12,7 @@ hostprogs-y += tracex3
hostprogs-y += tracex4
hostprogs-y += tracex5
hostprogs-y += tracex6
+hostprogs-y += tracex7
hostprogs-y += test_probe_write_user
hostprogs-y += trace_output
hostprogs-y += lathist
@@ -58,6 +59,7 @@ tracex3-objs := bpf_load.o $(LIBBPF) tracex3_user.o
tracex4-objs := bpf_load.o $(LIBBPF) tracex4_user.o
tracex5-objs := bpf_load.o $(LIBBPF) tracex5_user.o
tracex6-objs := bpf_load.o $(LIBBPF) tracex6_user.o
+tracex7-objs := bpf_load.o $(LIBBPF) tracex7_user.o
load_sock_ops-objs := bpf_load.o $(LIBBPF) load_sock_ops.o
test_probe_write_user-objs := bpf_load.o $(LIBBPF) test_probe_write_user_user.o
trace_output-objs := bpf_load.o $(LIBBPF) trace_output_user.o
@@ -101,6 +103,7 @@ always += tracex3_kern.o
always += tracex4_kern.o
always += tracex5_kern.o
always += tracex6_kern.o
+always += tracex7_kern.o
always += sock_flags_kern.o
always += test_probe_write_user_kern.o
always += trace_output_kern.o
@@ -155,6 +158,7 @@ HOSTLOADLIBES_tracex3 += -lelf
HOSTLOADLIBES_tracex4 += -lelf -lrt
HOSTLOADLIBES_tracex5 += -lelf
HOSTLOADLIBES_tracex6 += -lelf
+HOSTLOADLIBES_tracex7 += -lelf
HOSTLOADLIBES_test_cgrp2_sock2 += -lelf
HOSTLOADLIBES_load_sock_ops += -lelf
HOSTLOADLIBES_test_probe_write_user += -lelf
diff --git a/samples/bpf/test_override_return.sh b/samples/bpf/test_override_return.sh
new file mode 100755
index 000000000000..e68b9ee6814b
--- /dev/null
+++ b/samples/bpf/test_override_return.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+rm -f testfile.img
+dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1
+DEVICE=$(losetup --show -f testfile.img)
+mkfs.btrfs -f $DEVICE
+mkdir tmpmnt
+./tracex7 $DEVICE
+if [ $? -eq 0 ]
+then
+ echo "SUCCESS!"
+else
+ echo "FAILED!"
+fi
+losetup -d $DEVICE
diff --git a/samples/bpf/tracex7_kern.c b/samples/bpf/tracex7_kern.c
new file mode 100644
index 000000000000..1ab308a43e0f
--- /dev/null
+++ b/samples/bpf/tracex7_kern.c
@@ -0,0 +1,16 @@
+#include <uapi/linux/ptrace.h>
+#include <uapi/linux/bpf.h>
+#include <linux/version.h>
+#include "bpf_helpers.h"
+
+SEC("kprobe/open_ctree")
+int bpf_prog1(struct pt_regs *ctx)
+{
+ unsigned long rc = -12;
+
+ bpf_override_return(ctx, rc);
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+u32 _version SEC("version") = LINUX_VERSION_CODE;
diff --git a/samples/bpf/tracex7_user.c b/samples/bpf/tracex7_user.c
new file mode 100644
index 000000000000..8a52ac492e8b
--- /dev/null
+++ b/samples/bpf/tracex7_user.c
@@ -0,0 +1,28 @@
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <linux/bpf.h>
+#include <unistd.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+
+int main(int argc, char **argv)
+{
+ FILE *f;
+ char filename[256];
+ char command[256];
+ int ret;
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+ if (load_bpf_file(filename)) {
+ printf("%s", bpf_log_buf);
+ return 1;
+ }
+
+ snprintf(command, 256, "mount %s tmpmnt/", argv[1]);
+ f = popen(command, "r");
+ ret = pclose(f);
+
+ return ret ? 0 : 1;
+}