bpftool: Add bpf_link show and pin support

Add `bpftool link show` and `bpftool link pin` commands.

Example plain output for `link show` (with showing pinned paths):

[vmuser@archvm bpf]$ sudo ~/local/linux/tools/bpf/bpftool/bpftool -f link
1: tracing  prog 12
        prog_type tracing  attach_type fentry
        pinned /sys/fs/bpf/my_test_link
        pinned /sys/fs/bpf/my_test_link2
2: tracing  prog 13
        prog_type tracing  attach_type fentry
3: tracing  prog 14
        prog_type tracing  attach_type fentry
4: tracing  prog 15
        prog_type tracing  attach_type fentry
5: tracing  prog 16
        prog_type tracing  attach_type fentry
6: tracing  prog 17
        prog_type tracing  attach_type fentry
7: raw_tracepoint  prog 21
        tp 'sys_enter'
8: cgroup  prog 25
        cgroup_id 584  attach_type egress
9: cgroup  prog 25
        cgroup_id 599  attach_type egress
10: cgroup  prog 25
        cgroup_id 614  attach_type egress
11: cgroup  prog 25
        cgroup_id 629  attach_type egress
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20200429001614.1544-9-andriin@fb.com

tools/bpf/bpftool/common.c

@@ -262,6 +262,8 @@ int get_fd_type(int fd)
 		return BPF_OBJ_MAP;
 	else if (strstr(buf, "bpf-prog"))
 		return BPF_OBJ_PROG;
+	else if (strstr(buf, "bpf-link"))
+		return BPF_OBJ_LINK;
 
 	return BPF_OBJ_UNKNOWN;
 }

tools/bpf/bpftool/link.c

+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2020 Facebook */
+
+#include <errno.h>
+#include <net/if.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <bpf/bpf.h>
+
+#include "json_writer.h"
+#include "main.h"
+
+static const char * const link_type_name[] = {
+	[BPF_LINK_TYPE_UNSPEC]			= "unspec",
+	[BPF_LINK_TYPE_RAW_TRACEPOINT]		= "raw_tracepoint",
+	[BPF_LINK_TYPE_TRACING]			= "tracing",
+	[BPF_LINK_TYPE_CGROUP]			= "cgroup",
+};
+
+static int link_parse_fd(int *argc, char ***argv)
+{
+	if (is_prefix(**argv, "id")) {
+		unsigned int id;
+		char *endptr;
+
+		NEXT_ARGP();
+
+		id = strtoul(**argv, &endptr, 0);
+		if (*endptr) {
+			p_err("can't parse %s as ID", **argv);
+			return -1;
+		}
+		NEXT_ARGP();
+
+		return bpf_link_get_fd_by_id(id);
+	} else if (is_prefix(**argv, "pinned")) {
+		char *path;
+
+		NEXT_ARGP();
+
+		path = **argv;
+		NEXT_ARGP();
+
+		return open_obj_pinned_any(path, BPF_OBJ_LINK);
+	}
+
+	p_err("expected 'id' or 'pinned', got: '%s'?", **argv);
+	return -1;
+}
+
+static void
+show_link_header_json(struct bpf_link_info *info, json_writer_t *wtr)
+{
+	jsonw_uint_field(wtr, "id", info->id);
+	if (info->type < ARRAY_SIZE(link_type_name))
+		jsonw_string_field(wtr, "type", link_type_name[info->type]);
+	else
+		jsonw_uint_field(wtr, "type", info->type);
+
+	jsonw_uint_field(json_wtr, "prog_id", info->prog_id);
+}
+
+static int get_prog_info(int prog_id, struct bpf_prog_info *info)
+{
+	__u32 len = sizeof(*info);
+	int err, prog_fd;
+
+	prog_fd = bpf_prog_get_fd_by_id(prog_id);
+	if (prog_fd < 0)
+		return prog_fd;
+
+	memset(info, 0, sizeof(*info));
+	err = bpf_obj_get_info_by_fd(prog_fd, info, &len);
+	if (err)
+		p_err("can't get prog info: %s", strerror(errno));
+	close(prog_fd);
+	return err;
+}
+
+static int show_link_close_json(int fd, struct bpf_link_info *info)
+{
+	struct bpf_prog_info prog_info;
+	int err;
+
+	jsonw_start_object(json_wtr);
+
+	show_link_header_json(info, json_wtr);
+
+	switch (info->type) {
+	case BPF_LINK_TYPE_RAW_TRACEPOINT:
+		jsonw_string_field(json_wtr, "tp_name",
+				   (const char *)info->raw_tracepoint.tp_name);
+		break;
+	case BPF_LINK_TYPE_TRACING:
+		err = get_prog_info(info->prog_id, &prog_info);
+		if (err)
+			return err;
+
+		if (prog_info.type < ARRAY_SIZE(prog_type_name))
+			jsonw_string_field(json_wtr, "prog_type",
+					   prog_type_name[prog_info.type]);
+		else
+			jsonw_uint_field(json_wtr, "prog_type",
+					 prog_info.type);
+
+		if (info->tracing.attach_type < ARRAY_SIZE(attach_type_name))
+			jsonw_string_field(json_wtr, "attach_type",
+			       attach_type_name[info->tracing.attach_type]);
+		else
+			jsonw_uint_field(json_wtr, "attach_type",
+					 info->tracing.attach_type);
+		break;
+	case BPF_LINK_TYPE_CGROUP:
+		jsonw_lluint_field(json_wtr, "cgroup_id",
+				   info->cgroup.cgroup_id);
+		if (info->cgroup.attach_type < ARRAY_SIZE(attach_type_name))
+			jsonw_string_field(json_wtr, "attach_type",
+			       attach_type_name[info->cgroup.attach_type]);
+		else
+			jsonw_uint_field(json_wtr, "attach_type",
+					 info->cgroup.attach_type);
+		break;
+	default:
+		break;
+	}
+
+	if (!hash_empty(link_table.table)) {
+		struct pinned_obj *obj;
+
+		jsonw_name(json_wtr, "pinned");
+		jsonw_start_array(json_wtr);
+		hash_for_each_possible(link_table.table, obj, hash, info->id) {
+			if (obj->id == info->id)
+				jsonw_string(json_wtr, obj->path);
+		}
+		jsonw_end_array(json_wtr);
+	}
+	jsonw_end_object(json_wtr);
+
+	return 0;
+}
+
+static void show_link_header_plain(struct bpf_link_info *info)
+{
+	printf("%u: ", info->id);
+	if (info->type < ARRAY_SIZE(link_type_name))
+		printf("%s  ", link_type_name[info->type]);
+	else
+		printf("type %u  ", info->type);
+
+	printf("prog %u  ", info->prog_id);
+}
+
+static int show_link_close_plain(int fd, struct bpf_link_info *info)
+{
+	struct bpf_prog_info prog_info;
+	int err;
+
+	show_link_header_plain(info);
+
+	switch (info->type) {
+	case BPF_LINK_TYPE_RAW_TRACEPOINT:
+		printf("\n\ttp '%s'  ",
+		       (const char *)info->raw_tracepoint.tp_name);
+		break;
+	case BPF_LINK_TYPE_TRACING:
+		err = get_prog_info(info->prog_id, &prog_info);
+		if (err)
+			return err;
+
+		if (prog_info.type < ARRAY_SIZE(prog_type_name))
+			printf("\n\tprog_type %s  ",
+			       prog_type_name[prog_info.type]);
+		else
+			printf("\n\tprog_type %u  ", prog_info.type);
+
+		if (info->tracing.attach_type < ARRAY_SIZE(attach_type_name))
+			printf("attach_type %s  ",
+			       attach_type_name[info->tracing.attach_type]);
+		else
+			printf("attach_type %u  ", info->tracing.attach_type);
+		break;
+	case BPF_LINK_TYPE_CGROUP:
+		printf("\n\tcgroup_id %zu  ", (size_t)info->cgroup.cgroup_id);
+		if (info->cgroup.attach_type < ARRAY_SIZE(attach_type_name))
+			printf("attach_type %s  ",
+			       attach_type_name[info->cgroup.attach_type]);
+		else
+			printf("attach_type %u  ", info->cgroup.attach_type);
+		break;
+	default:
+		break;
+	}
+
+	if (!hash_empty(link_table.table)) {
+		struct pinned_obj *obj;
+
+		hash_for_each_possible(link_table.table, obj, hash, info->id) {
+			if (obj->id == info->id)
+				printf("\n\tpinned %s", obj->path);
+		}
+	}
+
+	printf("\n");
+
+	return 0;
+}
+
+static int do_show_link(int fd)
+{
+	struct bpf_link_info info;
+	__u32 len = sizeof(info);
+	char raw_tp_name[256];
+	int err;
+
+	memset(&info, 0, sizeof(info));
+again:
+	err = bpf_obj_get_info_by_fd(fd, &info, &len);
+	if (err) {
+		p_err("can't get link info: %s",
+		      strerror(errno));
+		close(fd);
+		return err;
+	}
+	if (info.type == BPF_LINK_TYPE_RAW_TRACEPOINT &&
+	    !info.raw_tracepoint.tp_name) {
+		info.raw_tracepoint.tp_name = (unsigned long)&raw_tp_name;
+		info.raw_tracepoint.tp_name_len = sizeof(raw_tp_name);
+		goto again;
+	}
+
+	if (json_output)
+		show_link_close_json(fd, &info);
+	else
+		show_link_close_plain(fd, &info);
+
+	close(fd);
+	return 0;
+}
+
+static int do_show(int argc, char **argv)
+{
+	__u32 id = 0;
+	int err, fd;
+
+	if (show_pinned)
+		build_pinned_obj_table(&link_table, BPF_OBJ_LINK);
+
+	if (argc == 2) {
+		fd = link_parse_fd(&argc, &argv);
+		if (fd < 0)
+			return fd;
+		return do_show_link(fd);
+	}
+
+	if (argc)
+		return BAD_ARG();
+
+	if (json_output)
+		jsonw_start_array(json_wtr);
+	while (true) {
+		err = bpf_link_get_next_id(id, &id);
+		if (err) {
+			if (errno == ENOENT)
+				break;
+			p_err("can't get next link: %s%s", strerror(errno),
+			      errno == EINVAL ? " -- kernel too old?" : "");
+			break;
+		}
+
+		fd = bpf_link_get_fd_by_id(id);
+		if (fd < 0) {
+			if (errno == ENOENT)
+				continue;
+			p_err("can't get link by id (%u): %s",
+			      id, strerror(errno));
+			break;
+		}
+
+		err = do_show_link(fd);
+		if (err)
+			break;
+	}
+	if (json_output)
+		jsonw_end_array(json_wtr);
+
+	return errno == ENOENT ? 0 : -1;
+}
+
+static int do_pin(int argc, char **argv)
+{
+	int err;
+
+	err = do_pin_any(argc, argv, link_parse_fd);
+	if (!err && json_output)
+		jsonw_null(json_wtr);
+	return err;
+}
+
+static int do_help(int argc, char **argv)
+{
+	if (json_output) {
+		jsonw_null(json_wtr);
+		return 0;
+	}
+
+	fprintf(stderr,
+		"Usage: %1$s %2$s { show | list }   [LINK]\n"
+		"       %1$s %2$s pin        LINK  FILE\n"
+		"       %1$s %2$s help\n"
+		"\n"
+		"       " HELP_SPEC_LINK "\n"
+		"       " HELP_SPEC_PROGRAM "\n"
+		"       " HELP_SPEC_OPTIONS "\n"
+		"",
+		bin_name, argv[-2]);
+
+	return 0;
+}
+
+static const struct cmd cmds[] = {
+	{ "show",	do_show },
+	{ "list",	do_show },
+	{ "help",	do_help },
+	{ "pin",	do_pin },
+	{ 0 }
+};
+
+int do_link(int argc, char **argv)
+{
+	return cmd_select(cmds, argc, argv, do_help);
+}

tools/bpf/bpftool/main.c

@@ -30,6 +30,7 @@ bool verifier_logs;
 bool relaxed_maps;
 struct pinned_obj_table prog_table;
 struct pinned_obj_table map_table;
+struct pinned_obj_table link_table;
 
 static void __noreturn clean_and_exit(int i)
 {
@@ -58,7 +59,7 @@ static int do_help(int argc, char **argv)
 		"       %s batch file FILE\n"
 		"       %s version\n"
 		"\n"
-		"       OBJECT := { prog | map | cgroup | perf | net | feature | btf | gen | struct_ops }\n"
+		"       OBJECT := { prog | map | link | cgroup | perf | net | feature | btf | gen | struct_ops }\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
 		bin_name, bin_name, bin_name);
@@ -215,6 +216,7 @@ static const struct cmd cmds[] = {
 	{ "batch",	do_batch },
 	{ "prog",	do_prog },
 	{ "map",	do_map },
+	{ "link",	do_link },
 	{ "cgroup",	do_cgroup },
 	{ "perf",	do_perf },
 	{ "net",	do_net },
@@ -364,6 +366,7 @@ int main(int argc, char **argv)
 
 	hash_init(prog_table.table);
 	hash_init(map_table.table);
+	hash_init(link_table.table);
 
 	opterr = 0;
 	while ((opt = getopt_long(argc, argv, "Vhpjfmnd",
@@ -422,6 +425,7 @@ int main(int argc, char **argv)
 	if (show_pinned) {
 		delete_pinned_obj_table(&prog_table);
 		delete_pinned_obj_table(&map_table);
+		delete_pinned_obj_table(&link_table);
 	}
 
 	return ret;

tools/bpf/bpftool/main.h

@@ -50,6 +50,8 @@
 	"\t            {-m|--mapcompat} | {-n|--nomount} }"
 #define HELP_SPEC_MAP							\
 	"MAP := { id MAP_ID | pinned FILE | name MAP_NAME }"
+#define HELP_SPEC_LINK							\
+	"LINK := { id LINK_ID | pinned FILE }"
 
 static const char * const prog_type_name[] = {
 	[BPF_PROG_TYPE_UNSPEC]			= "unspec",
@@ -122,6 +124,7 @@ enum bpf_obj_type {
 	BPF_OBJ_UNKNOWN,
 	BPF_OBJ_PROG,
 	BPF_OBJ_MAP,
+	BPF_OBJ_LINK,
 };
 
 extern const char *bin_name;
@@ -134,6 +137,7 @@ extern bool verifier_logs;
 extern bool relaxed_maps;
 extern struct pinned_obj_table prog_table;
 extern struct pinned_obj_table map_table;
+extern struct pinned_obj_table link_table;
 
 void __printf(1, 2) p_err(const char *fmt, ...);
 void __printf(1, 2) p_info(const char *fmt, ...);
@@ -185,6 +189,7 @@ int do_pin_fd(int fd, const char *name);
 
 int do_prog(int argc, char **arg);
 int do_map(int argc, char **arg);
+int do_link(int argc, char **arg);
 int do_event_pipe(int argc, char **argv);
 int do_cgroup(int argc, char **arg);
 int do_perf(int argc, char **arg);