Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2020-08-04

The following pull-request contains BPF updates for your *net-next* tree.

We've added 73 non-merge commits during the last 9 day(s) which contain
a total of 135 files changed, 4603 insertions(+), 1013 deletions(-).

The main changes are:

1) Implement bpf_link support for XDP. Also add LINK_DETACH operation for the BPF
   syscall allowing processes with BPF link FD to force-detach, from Andrii Nakryiko.

2) Add BPF iterator for map elements and to iterate all BPF programs for efficient
   in-kernel inspection, from Yonghong Song and Alexei Starovoitov.

3) Separate bpf_get_{stack,stackid}() helpers for perf events in BPF to avoid
   unwinder errors, from Song Liu.

4) Allow cgroup local storage map to be shared between programs on the same
   cgroup. Also extend BPF selftests with coverage, from YiFei Zhu.

5) Add BPF exception tables to ARM64 JIT in order to be able to JIT BPF_PROBE_MEM
   load instructions, from Jean-Philippe Brucker.

6) Follow-up fixes on BPF socket lookup in combination with reuseport group
   handling. Also add related BPF selftests, from Jakub Sitnicki.

7) Allow to use socket storage in BPF_PROG_TYPE_CGROUP_SOCK-typed programs for
   socket create/release as well as bind functions, from Stanislav Fomichev.

8) Fix an info leak in xsk_getsockopt() when retrieving XDP stats via old struct
   xdp_statistics, from Peilin Ye.

9) Fix PT_REGS_RC{,_CORE}() macros in libbpf for MIPS arch, from Jerry Crunchtime.

10) Extend BPF kernel test infra with skb->family and skb->{local,remote}_ip{4,6}
    fields and allow user space to specify skb->dev via ifindex, from Dmitry Yakunin.

11) Fix a bpftool segfault due to missing program type name and make it more robust
    to prevent them in future gaps, from Quentin Monnet.

12) Consolidate cgroup helper functions across selftests and fix a v6 localhost
    resolver issue, from John Fastabend.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 4 deletions

diff --git a/tools/bpf/bpftool/iter.c b/tools/bpf/bpftool/iter.c
index 33240fcc6319..c9dba7543dba 100644
--- a/tools/bpf/bpftool/iter.c
+++ b/tools/bpf/bpftool/iter.c
@@ -2,6 +2,7 @@
 // Copyright (C) 2020 Facebook
 
 #define _GNU_SOURCE
+#include <unistd.h>
 #include <linux/err.h>
 #include <bpf/libbpf.h>
 
@@ -9,11 +10,12 @@
 
 static int do_pin(int argc, char **argv)
 {
+	DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, iter_opts);
 	const char *objfile, *path;
 	struct bpf_program *prog;
 	struct bpf_object *obj;
 	struct bpf_link *link;
-	int err;
+	int err = -1, map_fd = -1;
 
 	if (!REQ_ARGS(2))
 		usage();
@@ -21,10 +23,26 @@ static int do_pin(int argc, char **argv)
 	objfile = GET_ARG();
 	path = GET_ARG();
 
+	/* optional arguments */
+	if (argc) {
+		if (is_prefix(*argv, "map")) {
+			NEXT_ARG();
+
+			if (!REQ_ARGS(2)) {
+				p_err("incorrect map spec");
+				return -1;
+			}
+
+			map_fd = map_parse_fd(&argc, &argv);
+			if (map_fd < 0)
+				return -1;
+		}
+	}
+
 	obj = bpf_object__open(objfile);
 	if (IS_ERR(obj)) {
 		p_err("can't open objfile %s", objfile);
-		return -1;
+		goto close_map_fd;
 	}
 
 	err = bpf_object__load(obj);
@@ -39,7 +57,10 @@ static int do_pin(int argc, char **argv)
 		goto close_obj;
 	}
 
-	link = bpf_program__attach_iter(prog, NULL);
+	if (map_fd >= 0)
+		iter_opts.map_fd = map_fd;
+
+	link = bpf_program__attach_iter(prog, &iter_opts);
 	if (IS_ERR(link)) {
 		err = PTR_ERR(link);
 		p_err("attach_iter failed for program %s",
@@ -62,14 +83,18 @@ close_link:
 	bpf_link__destroy(link);
 close_obj:
 	bpf_object__close(obj);
+close_map_fd:
+	if (map_fd >= 0)
+		close(map_fd);
 	return err;
 }
 
 static int do_help(int argc, char **argv)
 {
 	fprintf(stderr,
-		"Usage: %1$s %2$s pin OBJ PATH\n"
+		"Usage: %1$s %2$s pin OBJ PATH [map MAP]\n"
 		"       %1$s %2$s help\n"
+		"       " HELP_SPEC_MAP "\n"
 		"",
 		bin_name, "iter");