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Message-ID: <20190219053836.2086878-1-brakmo@fb.com>
Date: Mon, 18 Feb 2019 21:38:36 -0800
From: brakmo <brakmo@...com>
To: netdev <netdev@...r.kernel.org>
CC: Martin Lau <kafai@...com>, Alexei Starovoitov <ast@...com>,
Daniel Borkmann --cc=Kernel Team
<"daniel@...earbox.netKernel-team"@fb.com>
Subject: [PATCH bpf-next 6/9] bpf: Sample program to load cg skb BPF programs
The program load_cg_skb can be used to load BPF_PROG_TYPE_CGROUP_SKB
type bpf_prog which currently can be attached to the ingress and egress
patch. It can also be used to detach the bpf_prog.
Examples:
load_cg_skb [-i] <cg-path> <prog filename>
Load and attaches a cg skb program to the specified cgroup.
If "-i" is used, the program is attached as ingress (default is
egress).
load_cg_skb -r[i] <cg-path>
Detaches the currnetly attached egress (or ingress if -ri is used)
cg skb program from the specified cgroup.
Signed-off-by: Lawrence Brakmo <brakmo@...com>
---
samples/bpf/Makefile | 2 +
samples/bpf/load_cg_skb.c | 109 ++++++++++++++++++++++++++++++++++++++
2 files changed, 111 insertions(+)
create mode 100644 samples/bpf/load_cg_skb.c
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index a0ef7eddd0b3..0cf3347c7443 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -53,6 +53,7 @@ hostprogs-y += xdpsock
hostprogs-y += xdp_fwd
hostprogs-y += task_fd_query
hostprogs-y += xdp_sample_pkts
+hostprogs-y += load_cg_skb
# Libbpf dependencies
LIBBPF = $(TOOLS_PATH)/lib/bpf/libbpf.a
@@ -109,6 +110,7 @@ xdpsock-objs := xdpsock_user.o
xdp_fwd-objs := xdp_fwd_user.o
task_fd_query-objs := bpf_load.o task_fd_query_user.o $(TRACE_HELPERS)
xdp_sample_pkts-objs := xdp_sample_pkts_user.o $(TRACE_HELPERS)
+load_cg_skb-objs := bpf_load.o load_cg_skb.o
# Tell kbuild to always build the programs
always := $(hostprogs-y)
diff --git a/samples/bpf/load_cg_skb.c b/samples/bpf/load_cg_skb.c
new file mode 100644
index 000000000000..619ff834fc8c
--- /dev/null
+++ b/samples/bpf/load_cg_skb.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Facebook
+ *
+ * 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.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/bpf.h>
+#include <bpf/bpf.h>
+#include "bpf_load.h"
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/unistd.h>
+
+static void usage(char *pname)
+{
+ printf("USAGE:\n %s [-i] [-l] <cg-path> <prog filename>\n", pname);
+ printf("\tLoad and attach a cgroup/skb egress/ingress program to"
+ " the specified\n"
+ "\tcgroup\n"
+ "\tIf \"-i\" is used, an ingress program is loaded (default is"
+ " egress)\n"
+ "\tIf \"-l\" is used, the program will continue to run"
+ " printing the BPF log\n"
+ "\tbuffer\n"
+ "\tIf the specified filename does not end in \".o\", it"
+ " appends \"_kern.o\"\n"
+ "\tto the name\n\n");
+ printf(" %s -r <cg-path>\n", pname);
+ printf("\tDetaches the currently attached cgroup/skb egress program\n"
+ "\tfrom the specified cgroup\n");
+ printf(" %s -ri <cg-path>\n", pname);
+ printf("\tDetaches the currently attached cgroup/skb ingress program\n"
+ "\tfrom the specified cgroup\n\n");
+ exit(1);
+}
+
+int main(int argc, char **argv)
+{
+ int logFlag = 0;
+ int error = 0;
+ char *cg_path;
+ char fn[500];
+ char *prog;
+ int cg_fd;
+ int mode = BPF_CGROUP_INET_EGRESS;
+
+ if (argc < 3)
+ usage(argv[0]);
+
+ if (!strcmp(argv[1], "-i")) {
+ mode = BPF_CGROUP_INET_INGRESS;
+ } else if (!strncmp(argv[1], "-r", 2)) {
+ if (argv[1][2] == 'i')
+ mode = BPF_CGROUP_INET_INGRESS;
+ cg_path = argv[2];
+ cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
+ error = bpf_prog_detach(cg_fd, mode);
+ if (error) {
+ printf("ERROR: bpf_prog_detach: %d (%s)\n",
+ error, strerror(errno));
+ return 2;
+ }
+ return 0;
+ } else if (!strcmp(argv[1], "-h")) {
+ usage(argv[0]);
+ } else if (!strcmp(argv[1], "-l")) {
+ logFlag = 1;
+ if (argc < 4)
+ usage(argv[0]);
+ }
+
+ prog = argv[argc - 1];
+ cg_path = argv[argc - 2];
+ if (strlen(prog) > 480) {
+ fprintf(stderr, "ERROR: program name too long (> 480 chars)\n");
+ return 3;
+ }
+ cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
+
+ if (!strcmp(prog + strlen(prog)-2, ".o"))
+ strcpy(fn, prog);
+ else
+ sprintf(fn, "%s_kern.o", prog);
+ if (logFlag)
+ printf("loading bpf file:%s\n", fn);
+ if (load_bpf_file(fn)) {
+ printf("ERROR: load_bpf_file failed for: %s\n", fn);
+ printf("%s", bpf_log_buf);
+ return 4;
+ }
+ if (logFlag)
+ printf("TCP BPF Loaded %s\n", fn);
+
+ error = bpf_prog_attach(prog_fd[0], cg_fd, BPF_CGROUP_INET_EGRESS, 0);
+ if (error) {
+ printf("ERROR: bpf_prog_attach: %d (%s)\n",
+ error, strerror(errno));
+ return 5;
+ } else if (logFlag) {
+ read_trace_pipe();
+ }
+
+ return error;
+}
--
2.17.1
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