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Date: Fri, 27 Jun 2014 17:06:04 -0700
From: Alexei Starovoitov <ast@...mgrid.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Steven Rostedt <rostedt@...dmis.org>,
Daniel Borkmann <dborkman@...hat.com>,
Chema Gonzalez <chema@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...radead.org>,
Jiri Olsa <jolsa@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>, linux-api@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH RFC net-next 12/14] samples: bpf: add mini eBPF library to manipulate maps and programs
the library includes a trivial set of BPF syscall wrappers:
int bpf_delete_map(int map_id);
int bpf_create_map(int map_id, int key_size, int value_size, int max_entries);
int bpf_update_elem(int map_id, void *key, void *value);
int bpf_lookup_elem(int map_id, void *key, void *value);
int bpf_delete_elem(int map_id, void *key);
int bpf_get_next_key(int map_id, void *key, void *next_key);
int bpf_prog_load(int prog_id, enum bpf_prog_type prog_type,
struct sock_filter_int *insns, int insn_cnt,
const char *license);
int bpf_prog_unload(int prog_id);
Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
---
samples/bpf/libbpf.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++
samples/bpf/libbpf.h | 18 ++++++++
2 files changed, 132 insertions(+)
create mode 100644 samples/bpf/libbpf.c
create mode 100644 samples/bpf/libbpf.h
diff --git a/samples/bpf/libbpf.c b/samples/bpf/libbpf.c
new file mode 100644
index 000000000000..763eaf4b9814
--- /dev/null
+++ b/samples/bpf/libbpf.c
@@ -0,0 +1,114 @@
+/* eBPF mini library */
+#include <stdlib.h>
+#include <linux/unistd.h>
+#include <unistd.h>
+#include <string.h>
+#include <linux/netlink.h>
+#include <linux/bpf.h>
+#include <errno.h>
+#include "libbpf.h"
+
+struct nlattr_u32 {
+ __u16 nla_len;
+ __u16 nla_type;
+ __u32 val;
+};
+
+int bpf_delete_map(int map_id)
+{
+ return syscall(__NR_bpf, BPF_MAP_DELETE, map_id);
+}
+
+int bpf_create_map(int map_id, int key_size, int value_size, int max_entries)
+{
+ struct nlattr_u32 attr[] = {
+ {
+ .nla_len = sizeof(struct nlattr_u32),
+ .nla_type = BPF_MAP_KEY_SIZE,
+ .val = key_size,
+ },
+ {
+ .nla_len = sizeof(struct nlattr_u32),
+ .nla_type = BPF_MAP_VALUE_SIZE,
+ .val = value_size,
+ },
+ {
+ .nla_len = sizeof(struct nlattr_u32),
+ .nla_type = BPF_MAP_MAX_ENTRIES,
+ .val = max_entries,
+ },
+ };
+ int err;
+
+ err = syscall(__NR_bpf, BPF_MAP_CREATE, map_id, BPF_MAP_TYPE_HASH, attr, sizeof(attr));
+ if (err > 0 && err != map_id && map_id != 0) {
+ bpf_delete_map(err);
+ errno = EEXIST;
+ err = -1;
+ }
+ return err;
+}
+
+
+int bpf_update_elem(int map_id, void *key, void *value)
+{
+ return syscall(__NR_bpf, BPF_MAP_UPDATE_ELEM, map_id, key, value);
+}
+
+int bpf_lookup_elem(int map_id, void *key, void *value)
+{
+ return syscall(__NR_bpf, BPF_MAP_LOOKUP_ELEM, map_id, key, value);
+}
+
+int bpf_delete_elem(int map_id, void *key)
+{
+ return syscall(__NR_bpf, BPF_MAP_DELETE_ELEM, map_id, key);
+}
+
+int bpf_get_next_key(int map_id, void *key, void *next_key)
+{
+ return syscall(__NR_bpf, BPF_MAP_GET_NEXT_KEY, map_id, key, next_key);
+}
+
+#define ROUND_UP(x, n) (((x) + (n) - 1u) & ~((n) - 1u))
+
+int bpf_prog_load(int prog_id, enum bpf_prog_type prog_type,
+ struct sock_filter_int *insns, int prog_len,
+ const char *license)
+{
+ int nlattr_size, license_len, err;
+ void *nlattr, *ptr;
+
+ license_len = strlen(license) + 1;
+ nlattr_size = sizeof(struct nlattr) + prog_len + sizeof(struct nlattr) +
+ ROUND_UP(license_len, 4);
+
+ ptr = nlattr = malloc(nlattr_size);
+
+ *(struct nlattr *) ptr = (struct nlattr) {
+ .nla_len = prog_len + sizeof(struct nlattr),
+ .nla_type = BPF_PROG_TEXT,
+ };
+ ptr += sizeof(struct nlattr);
+
+ memcpy(ptr, insns, prog_len);
+ ptr += prog_len;
+
+ *(struct nlattr *) ptr = (struct nlattr) {
+ .nla_len = ROUND_UP(license_len, 4) + sizeof(struct nlattr),
+ .nla_type = BPF_PROG_LICENSE,
+ };
+ ptr += sizeof(struct nlattr);
+
+ memcpy(ptr, license, license_len);
+
+ err = syscall(__NR_bpf, BPF_PROG_LOAD, prog_id, prog_type, nlattr,
+ nlattr_size);
+ free(nlattr);
+ return err;
+}
+
+int bpf_prog_unload(int prog_id)
+{
+ return syscall(__NR_bpf, BPF_PROG_UNLOAD, prog_id);
+}
diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h
new file mode 100644
index 000000000000..408368e6d4d5
--- /dev/null
+++ b/samples/bpf/libbpf.h
@@ -0,0 +1,18 @@
+/* eBPF mini library */
+#ifndef __LIBBPF_H
+#define __LIBBPF_H
+
+struct sock_filter_int;
+
+int bpf_delete_map(int map_id);
+int bpf_create_map(int map_id, int key_size, int value_size, int max_entries);
+int bpf_update_elem(int map_id, void *key, void *value);
+int bpf_lookup_elem(int map_id, void *key, void *value);
+int bpf_delete_elem(int map_id, void *key);
+int bpf_get_next_key(int map_id, void *key, void *next_key);
+int bpf_prog_load(int prog_id, enum bpf_prog_type prog_type,
+ struct sock_filter_int *insns, int insn_cnt,
+ const char *license);
+int bpf_prog_unload(int prog_id);
+
+#endif
--
1.7.9.5
--
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