From: David Ahern <dsa@cumulusnetworks.com>
Date: Mon, 12 Dec 2016 00:53:08 +0000 (-0800)
Subject: lib bpf: Add support for BPF_PROG_ATTACH and BPF_PROG_DETACH
X-Git-Tag: v4.10.0~70
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc4ccce038942f42485bcbf7b49e90b8d24f3438;p=thirdparty%2Fiproute2.git

lib bpf: Add support for BPF_PROG_ATTACH and BPF_PROG_DETACH

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
---

diff --git a/include/bpf_util.h b/include/bpf_util.h
index 05baeecda..b03837968 100644
--- a/include/bpf_util.h
+++ b/include/bpf_util.h
@@ -75,6 +75,9 @@ int bpf_trace_pipe(void);
 
 void bpf_print_ops(FILE *f, struct rtattr *bpf_ops, __u16 len);
 
+int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);
+int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);
+
 #ifdef HAVE_ELF
 int bpf_send_map_fds(const char *path, const char *obj);
 int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,
diff --git a/lib/bpf.c b/lib/bpf.c
index 43ef63db9..006db9a86 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -868,6 +868,27 @@ out_prog:
 	return ret;
 }
 
+int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type)
+{
+	union bpf_attr attr = {};
+
+	attr.target_fd = target_fd;
+	attr.attach_bpf_fd = prog_fd;
+	attr.attach_type = type;
+
+	return bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
+}
+
+int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type)
+{
+	union bpf_attr attr = {};
+
+	attr.target_fd = target_fd;
+	attr.attach_type = type;
+
+	return bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
+}
+
 #ifdef HAVE_ELF
 struct bpf_elf_prog {
 	enum bpf_prog_type	type;