1 files changed, 704 insertions, 1518 deletions

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index e89cc9c885b3..50d41815f431 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -31,7 +31,6 @@
 #include <linux/bpf.h>
 #include <linux/btf.h>
 #include <linux/filter.h>
-#include <linux/list.h>
 #include <linux/limits.h>
 #include <linux/perf_event.h>
 #include <linux/ring_buffer.h>
@@ -72,6 +71,135 @@
 static struct bpf_map *bpf_object__add_map(struct bpf_object *obj);
 static bool prog_is_subprog(const struct bpf_object *obj, const struct bpf_program *prog);
 
+static const char * const attach_type_name[] = {
+	[BPF_CGROUP_INET_INGRESS]	= "cgroup_inet_ingress",
+	[BPF_CGROUP_INET_EGRESS]	= "cgroup_inet_egress",
+	[BPF_CGROUP_INET_SOCK_CREATE]	= "cgroup_inet_sock_create",
+	[BPF_CGROUP_INET_SOCK_RELEASE]	= "cgroup_inet_sock_release",
+	[BPF_CGROUP_SOCK_OPS]		= "cgroup_sock_ops",
+	[BPF_CGROUP_DEVICE]		= "cgroup_device",
+	[BPF_CGROUP_INET4_BIND]		= "cgroup_inet4_bind",
+	[BPF_CGROUP_INET6_BIND]		= "cgroup_inet6_bind",
+	[BPF_CGROUP_INET4_CONNECT]	= "cgroup_inet4_connect",
+	[BPF_CGROUP_INET6_CONNECT]	= "cgroup_inet6_connect",
+	[BPF_CGROUP_INET4_POST_BIND]	= "cgroup_inet4_post_bind",
+	[BPF_CGROUP_INET6_POST_BIND]	= "cgroup_inet6_post_bind",
+	[BPF_CGROUP_INET4_GETPEERNAME]	= "cgroup_inet4_getpeername",
+	[BPF_CGROUP_INET6_GETPEERNAME]	= "cgroup_inet6_getpeername",
+	[BPF_CGROUP_INET4_GETSOCKNAME]	= "cgroup_inet4_getsockname",
+	[BPF_CGROUP_INET6_GETSOCKNAME]	= "cgroup_inet6_getsockname",
+	[BPF_CGROUP_UDP4_SENDMSG]	= "cgroup_udp4_sendmsg",
+	[BPF_CGROUP_UDP6_SENDMSG]	= "cgroup_udp6_sendmsg",
+	[BPF_CGROUP_SYSCTL]		= "cgroup_sysctl",
+	[BPF_CGROUP_UDP4_RECVMSG]	= "cgroup_udp4_recvmsg",
+	[BPF_CGROUP_UDP6_RECVMSG]	= "cgroup_udp6_recvmsg",
+	[BPF_CGROUP_GETSOCKOPT]		= "cgroup_getsockopt",
+	[BPF_CGROUP_SETSOCKOPT]		= "cgroup_setsockopt",
+	[BPF_SK_SKB_STREAM_PARSER]	= "sk_skb_stream_parser",
+	[BPF_SK_SKB_STREAM_VERDICT]	= "sk_skb_stream_verdict",
+	[BPF_SK_SKB_VERDICT]		= "sk_skb_verdict",
+	[BPF_SK_MSG_VERDICT]		= "sk_msg_verdict",
+	[BPF_LIRC_MODE2]		= "lirc_mode2",
+	[BPF_FLOW_DISSECTOR]		= "flow_dissector",
+	[BPF_TRACE_RAW_TP]		= "trace_raw_tp",
+	[BPF_TRACE_FENTRY]		= "trace_fentry",
+	[BPF_TRACE_FEXIT]		= "trace_fexit",
+	[BPF_MODIFY_RETURN]		= "modify_return",
+	[BPF_LSM_MAC]			= "lsm_mac",
+	[BPF_LSM_CGROUP]		= "lsm_cgroup",
+	[BPF_SK_LOOKUP]			= "sk_lookup",
+	[BPF_TRACE_ITER]		= "trace_iter",
+	[BPF_XDP_DEVMAP]		= "xdp_devmap",
+	[BPF_XDP_CPUMAP]		= "xdp_cpumap",
+	[BPF_XDP]			= "xdp",
+	[BPF_SK_REUSEPORT_SELECT]	= "sk_reuseport_select",
+	[BPF_SK_REUSEPORT_SELECT_OR_MIGRATE]	= "sk_reuseport_select_or_migrate",
+	[BPF_PERF_EVENT]		= "perf_event",
+	[BPF_TRACE_KPROBE_MULTI]	= "trace_kprobe_multi",
+};
+
+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",
+	[BPF_LINK_TYPE_ITER]			= "iter",
+	[BPF_LINK_TYPE_NETNS]			= "netns",
+	[BPF_LINK_TYPE_XDP]			= "xdp",
+	[BPF_LINK_TYPE_PERF_EVENT]		= "perf_event",
+	[BPF_LINK_TYPE_KPROBE_MULTI]		= "kprobe_multi",
+	[BPF_LINK_TYPE_STRUCT_OPS]		= "struct_ops",
+};
+
+static const char * const map_type_name[] = {
+	[BPF_MAP_TYPE_UNSPEC]			= "unspec",
+	[BPF_MAP_TYPE_HASH]			= "hash",
+	[BPF_MAP_TYPE_ARRAY]			= "array",
+	[BPF_MAP_TYPE_PROG_ARRAY]		= "prog_array",
+	[BPF_MAP_TYPE_PERF_EVENT_ARRAY]		= "perf_event_array",
+	[BPF_MAP_TYPE_PERCPU_HASH]		= "percpu_hash",
+	[BPF_MAP_TYPE_PERCPU_ARRAY]		= "percpu_array",
+	[BPF_MAP_TYPE_STACK_TRACE]		= "stack_trace",
+	[BPF_MAP_TYPE_CGROUP_ARRAY]		= "cgroup_array",
+	[BPF_MAP_TYPE_LRU_HASH]			= "lru_hash",
+	[BPF_MAP_TYPE_LRU_PERCPU_HASH]		= "lru_percpu_hash",
+	[BPF_MAP_TYPE_LPM_TRIE]			= "lpm_trie",
+	[BPF_MAP_TYPE_ARRAY_OF_MAPS]		= "array_of_maps",
+	[BPF_MAP_TYPE_HASH_OF_MAPS]		= "hash_of_maps",
+	[BPF_MAP_TYPE_DEVMAP]			= "devmap",
+	[BPF_MAP_TYPE_DEVMAP_HASH]		= "devmap_hash",
+	[BPF_MAP_TYPE_SOCKMAP]			= "sockmap",
+	[BPF_MAP_TYPE_CPUMAP]			= "cpumap",
+	[BPF_MAP_TYPE_XSKMAP]			= "xskmap",
+	[BPF_MAP_TYPE_SOCKHASH]			= "sockhash",
+	[BPF_MAP_TYPE_CGROUP_STORAGE]		= "cgroup_storage",
+	[BPF_MAP_TYPE_REUSEPORT_SOCKARRAY]	= "reuseport_sockarray",
+	[BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE]	= "percpu_cgroup_storage",
+	[BPF_MAP_TYPE_QUEUE]			= "queue",
+	[BPF_MAP_TYPE_STACK]			= "stack",
+	[BPF_MAP_TYPE_SK_STORAGE]		= "sk_storage",
+	[BPF_MAP_TYPE_STRUCT_OPS]		= "struct_ops",
+	[BPF_MAP_TYPE_RINGBUF]			= "ringbuf",
+	[BPF_MAP_TYPE_INODE_STORAGE]		= "inode_storage",
+	[BPF_MAP_TYPE_TASK_STORAGE]		= "task_storage",
+	[BPF_MAP_TYPE_BLOOM_FILTER]		= "bloom_filter",
+};
+
+static const char * const prog_type_name[] = {
+	[BPF_PROG_TYPE_UNSPEC]			= "unspec",
+	[BPF_PROG_TYPE_SOCKET_FILTER]		= "socket_filter",
+	[BPF_PROG_TYPE_KPROBE]			= "kprobe",
+	[BPF_PROG_TYPE_SCHED_CLS]		= "sched_cls",
+	[BPF_PROG_TYPE_SCHED_ACT]		= "sched_act",
+	[BPF_PROG_TYPE_TRACEPOINT]		= "tracepoint",
+	[BPF_PROG_TYPE_XDP]			= "xdp",
+	[BPF_PROG_TYPE_PERF_EVENT]		= "perf_event",
+	[BPF_PROG_TYPE_CGROUP_SKB]		= "cgroup_skb",
+	[BPF_PROG_TYPE_CGROUP_SOCK]		= "cgroup_sock",
+	[BPF_PROG_TYPE_LWT_IN]			= "lwt_in",
+	[BPF_PROG_TYPE_LWT_OUT]			= "lwt_out",
+	[BPF_PROG_TYPE_LWT_XMIT]		= "lwt_xmit",
+	[BPF_PROG_TYPE_SOCK_OPS]		= "sock_ops",
+	[BPF_PROG_TYPE_SK_SKB]			= "sk_skb",
+	[BPF_PROG_TYPE_CGROUP_DEVICE]		= "cgroup_device",
+	[BPF_PROG_TYPE_SK_MSG]			= "sk_msg",
+	[BPF_PROG_TYPE_RAW_TRACEPOINT]		= "raw_tracepoint",
+	[BPF_PROG_TYPE_CGROUP_SOCK_ADDR]	= "cgroup_sock_addr",
+	[BPF_PROG_TYPE_LWT_SEG6LOCAL]		= "lwt_seg6local",
+	[BPF_PROG_TYPE_LIRC_MODE2]		= "lirc_mode2",
+	[BPF_PROG_TYPE_SK_REUSEPORT]		= "sk_reuseport",
+	[BPF_PROG_TYPE_FLOW_DISSECTOR]		= "flow_dissector",
+	[BPF_PROG_TYPE_CGROUP_SYSCTL]		= "cgroup_sysctl",
+	[BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE]	= "raw_tracepoint_writable",
+	[BPF_PROG_TYPE_CGROUP_SOCKOPT]		= "cgroup_sockopt",
+	[BPF_PROG_TYPE_TRACING]			= "tracing",
+	[BPF_PROG_TYPE_STRUCT_OPS]		= "struct_ops",
+	[BPF_PROG_TYPE_EXT]			= "ext",
+	[BPF_PROG_TYPE_LSM]			= "lsm",
+	[BPF_PROG_TYPE_SK_LOOKUP]		= "sk_lookup",
+	[BPF_PROG_TYPE_SYSCALL]			= "syscall",
+};
+
 static int __base_pr(enum libbpf_print_level level, const char *format,
 		     va_list args)
 {
@@ -151,12 +279,9 @@ static inline __u64 ptr_to_u64(const void *ptr)
 	return (__u64) (unsigned long) ptr;
 }
 
-/* this goes away in libbpf 1.0 */
-enum libbpf_strict_mode libbpf_mode = LIBBPF_STRICT_NONE;
-
 int libbpf_set_strict_mode(enum libbpf_strict_mode mode)
 {
-	libbpf_mode = mode;
+	/* as of v1.0 libbpf_set_strict_mode() is a no-op */
 	return 0;
 }
 
@@ -219,12 +344,8 @@ enum sec_def_flags {
 	SEC_ATTACH_BTF = 4,
 	/* BPF program type allows sleeping/blocking in kernel */
 	SEC_SLEEPABLE = 8,
-	/* allow non-strict prefix matching */
-	SEC_SLOPPY_PFX = 16,
 	/* BPF program support non-linear XDP buffer */
-	SEC_XDP_FRAGS = 32,
-	/* deprecated sec definitions not supposed to be used */
-	SEC_DEPRECATED = 64,
+	SEC_XDP_FRAGS = 16,
 };
 
 struct bpf_sec_def {
@@ -244,9 +365,10 @@ struct bpf_sec_def {
  * linux/filter.h.
  */
 struct bpf_program {
-	const struct bpf_sec_def *sec_def;
+	char *name;
 	char *sec_name;
 	size_t sec_idx;
+	const struct bpf_sec_def *sec_def;
 	/* this program's instruction offset (in number of instructions)
 	 * within its containing ELF section
 	 */
@@ -266,12 +388,6 @@ struct bpf_program {
 	 */
 	size_t sub_insn_off;
 
-	char *name;
-	/* name with / replaced by _; makes recursive pinning
-	 * in bpf_object__pin_programs easier
-	 */
-	char *pin_name;
-
 	/* instructions that belong to BPF program; insns[0] is located at
 	 * sec_insn_off instruction within its ELF section in ELF file, so
 	 * when mapping ELF file instruction index to the local instruction,
@@ -292,24 +408,19 @@ struct bpf_program {
 	size_t log_size;
 	__u32 log_level;
 
-	struct {
-		int nr;
-		int *fds;
-	} instances;
-	bpf_program_prep_t preprocessor;
-
 	struct bpf_object *obj;
-	void *priv;
-	bpf_program_clear_priv_t clear_priv;
 
+	int fd;
 	bool autoload;
 	bool mark_btf_static;
 	enum bpf_prog_type type;
 	enum bpf_attach_type expected_attach_type;
+
 	int prog_ifindex;
 	__u32 attach_btf_obj_fd;
 	__u32 attach_btf_id;
 	__u32 attach_prog_fd;
+
 	void *func_info;
 	__u32 func_info_rec_size;
 	__u32 func_info_cnt;
@@ -356,6 +467,14 @@ enum libbpf_map_type {
 	LIBBPF_MAP_KCONFIG,
 };
 
+struct bpf_map_def {
+	unsigned int type;
+	unsigned int key_size;
+	unsigned int value_size;
+	unsigned int max_entries;
+	unsigned int map_flags;
+};
+
 struct bpf_map {
 	struct bpf_object *obj;
 	char *name;
@@ -376,8 +495,6 @@ struct bpf_map {
 	__u32 btf_key_type_id;
 	__u32 btf_value_type_id;
 	__u32 btf_vmlinux_value_type_id;
-	void *priv;
-	bpf_map_clear_priv_t clear_priv;
 	enum libbpf_map_type libbpf_type;
 	void *mmaped;
 	struct bpf_struct_ops *st_ops;
@@ -440,8 +557,6 @@ struct extern_desc {
 	};
 };
 
-static LIST_HEAD(bpf_objects_list);
-
 struct module_btf {
 	struct btf *btf;
 	char *name;
@@ -510,12 +625,6 @@ struct bpf_object {
 
 	/* Information when doing ELF related work. Only valid if efile.elf is not NULL */
 	struct elf_state efile;
-	/*
-	 * All loaded bpf_object are linked in a list, which is
-	 * hidden to caller. bpf_objects__<func> handlers deal with
-	 * all objects.
-	 */
-	struct list_head list;
 
 	struct btf *btf;
 	struct btf_ext *btf_ext;
@@ -541,9 +650,6 @@ struct bpf_object {
 	size_t log_size;
 	__u32 log_level;
 
-	void *priv;
-	bpf_object_clear_priv_t clear_priv;
-
 	int *fd_array;
 	size_t fd_array_cap;
 	size_t fd_array_cnt;
@@ -565,25 +671,10 @@ static Elf64_Rel *elf_rel_by_idx(Elf_Data *data, size_t idx);
 
 void bpf_program__unload(struct bpf_program *prog)
 {
-	int i;
-
 	if (!prog)
 		return;
 
-	/*
-	 * If the object is opened but the program was never loaded,
-	 * it is possible that prog->instances.nr == -1.
-	 */
-	if (prog->instances.nr > 0) {
-		for (i = 0; i < prog->instances.nr; i++)
-			zclose(prog->instances.fds[i]);
-	} else if (prog->instances.nr != -1) {
-		pr_warn("Internal error: instances.nr is %d\n",
-			prog->instances.nr);
-	}
-
-	prog->instances.nr = -1;
-	zfree(&prog->instances.fds);
+	zclose(prog->fd);
 
 	zfree(&prog->func_info);
 	zfree(&prog->line_info);
@@ -594,16 +685,9 @@ static void bpf_program__exit(struct bpf_program *prog)
 	if (!prog)
 		return;
 
-	if (prog->clear_priv)
-		prog->clear_priv(prog, prog->priv);
-
-	prog->priv = NULL;
-	prog->clear_priv = NULL;
-
 	bpf_program__unload(prog);
 	zfree(&prog->name);
 	zfree(&prog->sec_name);
-	zfree(&prog->pin_name);
 	zfree(&prog->insns);
 	zfree(&prog->reloc_desc);
 
@@ -612,26 +696,6 @@ static void bpf_program__exit(struct bpf_program *prog)
 	prog->sec_idx = -1;
 }
 
-static char *__bpf_program__pin_name(struct bpf_program *prog)
-{
-	char *name, *p;
-
-	if (libbpf_mode & LIBBPF_STRICT_SEC_NAME)
-		name = strdup(prog->name);
-	else
-		name = strdup(prog->sec_name);
-
-	if (!name)
-		return NULL;
-
-	p = name;
-
-	while ((p = strchr(p, '/')))
-		*p = '_';
-
-	return name;
-}
-
 static bool insn_is_subprog_call(const struct bpf_insn *insn)
 {
 	return BPF_CLASS(insn->code) == BPF_JMP &&
@@ -673,6 +737,7 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
 	prog->insns_cnt = prog->sec_insn_cnt;
 
 	prog->type = BPF_PROG_TYPE_UNSPEC;
+	prog->fd = -1;
 
 	/* libbpf's convention for SEC("?abc...") is that it's just like
 	 * SEC("abc...") but the corresponding bpf_program starts out with
@@ -686,9 +751,6 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
 		prog->autoload = true;
 	}
 
-	prog->instances.fds = NULL;
-	prog->instances.nr = -1;
-
 	/* inherit object's log_level */
 	prog->log_level = obj->log_level;
 
@@ -700,10 +762,6 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
 	if (!prog->name)
 		goto errout;
 
-	prog->pin_name = __bpf_program__pin_name(prog);
-	if (!prog->pin_name)
-		goto errout;
-
 	prog->insns = malloc(insn_data_sz);
 	if (!prog->insns)
 		goto errout;
@@ -1185,7 +1243,6 @@ static struct bpf_object *bpf_object__new(const char *path,
 					  size_t obj_buf_sz,
 					  const char *obj_name)
 {
-	bool strict = (libbpf_mode & LIBBPF_STRICT_NO_OBJECT_LIST);
 	struct bpf_object *obj;
 	char *end;
 
@@ -1223,9 +1280,6 @@ static struct bpf_object *bpf_object__new(const char *path,
 	obj->kern_version = get_kernel_version();
 	obj->loaded = false;
 
-	INIT_LIST_HEAD(&obj->list);
-	if (!strict)
-		list_add(&obj->list, &bpf_objects_list);
 	return obj;
 }
 
@@ -1258,10 +1312,7 @@ static int bpf_object__elf_init(struct bpf_object *obj)
 	}
 
 	if (obj->efile.obj_buf_sz > 0) {
-		/*
-		 * obj_buf should have been validated by
-		 * bpf_object__open_buffer().
-		 */
+		/* obj_buf should have been validated by bpf_object__open_mem(). */
 		elf = elf_memory((char *)obj->efile.obj_buf, obj->efile.obj_buf_sz);
 	} else {
 		obj->efile.fd = open(obj->path, O_RDONLY | O_CLOEXEC);
@@ -1643,7 +1694,7 @@ static int set_kcfg_value_tri(struct extern_desc *ext, void *ext_val,
 	switch (ext->kcfg.type) {
 	case KCFG_BOOL:
 		if (value == 'm') {
-			pr_warn("extern (kcfg) %s=%c should be tristate or char\n",
+			pr_warn("extern (kcfg) '%s': value '%c' implies tristate or char type\n",
 				ext->name, value);
 			return -EINVAL;
 		}
@@ -1664,7 +1715,7 @@ static int set_kcfg_value_tri(struct extern_desc *ext, void *ext_val,
 	case KCFG_INT:
 	case KCFG_CHAR_ARR:
 	default:
-		pr_warn("extern (kcfg) %s=%c should be bool, tristate, or char\n",
+		pr_warn("extern (kcfg) '%s': value '%c' implies bool, tristate, or char type\n",
 			ext->name, value);
 		return -EINVAL;
 	}
@@ -1678,7 +1729,8 @@ static int set_kcfg_value_str(struct extern_desc *ext, char *ext_val,
 	size_t len;
 
 	if (ext->kcfg.type != KCFG_CHAR_ARR) {
-		pr_warn("extern (kcfg) %s=%s should be char array\n", ext->name, value);
+		pr_warn("extern (kcfg) '%s': value '%s' implies char array type\n",
+			ext->name, value);
 		return -EINVAL;
 	}
 
@@ -1692,7 +1744,7 @@ static int set_kcfg_value_str(struct extern_desc *ext, char *ext_val,
 	/* strip quotes */
 	len -= 2;
 	if (len >= ext->kcfg.sz) {
-		pr_warn("extern (kcfg) '%s': long string config %s of (%zu bytes) truncated to %d bytes\n",
+		pr_warn("extern (kcfg) '%s': long string '%s' of (%zu bytes) truncated to %d bytes\n",
 			ext->name, value, len, ext->kcfg.sz - 1);
 		len = ext->kcfg.sz - 1;
 	}
@@ -1749,13 +1801,20 @@ static bool is_kcfg_value_in_range(const struct extern_desc *ext, __u64 v)
 static int set_kcfg_value_num(struct extern_desc *ext, void *ext_val,
 			      __u64 value)
 {
-	if (ext->kcfg.type != KCFG_INT && ext->kcfg.type != KCFG_CHAR) {
-		pr_warn("extern (kcfg) %s=%llu should be integer\n",
+	if (ext->kcfg.type != KCFG_INT && ext->kcfg.type != KCFG_CHAR &&
+	    ext->kcfg.type != KCFG_BOOL) {
+		pr_warn("extern (kcfg) '%s': value '%llu' implies integer, char, or boolean type\n",
 			ext->name, (unsigned long long)value);
 		return -EINVAL;
 	}
+	if (ext->kcfg.type == KCFG_BOOL && value > 1) {
+		pr_warn("extern (kcfg) '%s': value '%llu' isn't boolean compatible\n",
+			ext->name, (unsigned long long)value);
+		return -EINVAL;
+
+	}
 	if (!is_kcfg_value_in_range(ext, value)) {
-		pr_warn("extern (kcfg) %s=%llu value doesn't fit in %d bytes\n",
+		pr_warn("extern (kcfg) '%s': value '%llu' doesn't fit in %d bytes\n",
 			ext->name, (unsigned long long)value, ext->kcfg.sz);
 		return -ERANGE;
 	}
@@ -1819,16 +1878,19 @@ static int bpf_object__process_kconfig_line(struct bpf_object *obj,
 		/* assume integer */
 		err = parse_u64(value, &num);
 		if (err) {
-			pr_warn("extern (kcfg) %s=%s should be integer\n",
-				ext->name, value);
+			pr_warn("extern (kcfg) '%s': value '%s' isn't a valid integer\n", ext->name, value);
 			return err;
 		}
+		if (ext->kcfg.type != KCFG_INT && ext->kcfg.type != KCFG_CHAR) {
+			pr_warn("extern (kcfg) '%s': value '%s' implies integer type\n", ext->name, value);
+			return -EINVAL;
+		}
 		err = set_kcfg_value_num(ext, ext_val, num);
 		break;
 	}
 	if (err)
 		return err;
-	pr_debug("extern (kcfg) %s=%s\n", ext->name, value);
+	pr_debug("extern (kcfg) '%s': set to %s\n", ext->name, value);
 	return 0;
 }
 
@@ -1924,143 +1986,6 @@ static int bpf_object__init_kconfig_map(struct bpf_object *obj)
 	return 0;
 }
 
-static int bpf_object__init_user_maps(struct bpf_object *obj, bool strict)
-{
-	Elf_Data *symbols = obj->efile.symbols;
-	int i, map_def_sz = 0, nr_maps = 0, nr_syms;
-	Elf_Data *data = NULL;
-	Elf_Scn *scn;
-
-	if (obj->efile.maps_shndx < 0)
-		return 0;
-
-	if (libbpf_mode & LIBBPF_STRICT_MAP_DEFINITIONS) {
-		pr_warn("legacy map definitions in SEC(\"maps\") are not supported\n");
-		return -EOPNOTSUPP;
-	}
-
-	if (!symbols)
-		return -EINVAL;
-
-	scn = elf_sec_by_idx(obj, obj->efile.maps_shndx);
-	data = elf_sec_data(obj, scn);
-	if (!scn || !data) {
-		pr_warn("elf: failed to get legacy map definitions for %s\n",
-			obj->path);
-		return -EINVAL;
-	}
-
-	/*
-	 * Count number of maps. Each map has a name.
-	 * Array of maps is not supported: only the first element is
-	 * considered.
-	 *
-	 * TODO: Detect array of map and report error.
-	 */
-	nr_syms = symbols->d_size / sizeof(Elf64_Sym);
-	for (i = 0; i < nr_syms; i++) {
-		Elf64_Sym *sym = elf_sym_by_idx(obj, i);
-
-		if (sym->st_shndx != obj->efile.maps_shndx)
-			continue;
-		if (ELF64_ST_TYPE(sym->st_info) == STT_SECTION)
-			continue;
-		nr_maps++;
-	}
-	/* Assume equally sized map definitions */
-	pr_debug("elf: found %d legacy map definitions (%zd bytes) in %s\n",
-		 nr_maps, data->d_size, obj->path);
-
-	if (!data->d_size || nr_maps == 0 || (data->d_size % nr_maps) != 0) {
-		pr_warn("elf: unable to determine legacy map definition size in %s\n",
-			obj->path);
-		return -EINVAL;
-	}
-	map_def_sz = data->d_size / nr_maps;
-
-	/* Fill obj->maps using data in "maps" section.  */
-	for (i = 0; i < nr_syms; i++) {
-		Elf64_Sym *sym = elf_sym_by_idx(obj, i);
-		const char *map_name;
-		struct bpf_map_def *def;
-		struct bpf_map *map;
-
-		if (sym->st_shndx != obj->efile.maps_shndx)
-			continue;
-		if (ELF64_ST_TYPE(sym->st_info) == STT_SECTION)
-			continue;
-
-		map = bpf_object__add_map(obj);
-		if (IS_ERR(map))
-			return PTR_ERR(map);
-
-		map_name = elf_sym_str(obj, sym->st_name);
-		if (!map_name) {
-			pr_warn("failed to get map #%d name sym string for obj %s\n",
-				i, obj->path);
-			return -LIBBPF_ERRNO__FORMAT;
-		}
-
-		pr_warn("map '%s' (legacy): legacy map definitions are deprecated, use BTF-defined maps instead\n", map_name);
-
-		if (ELF64_ST_BIND(sym->st_info) == STB_LOCAL) {
-			pr_warn("map '%s' (legacy): static maps are not supported\n", map_name);
-			return -ENOTSUP;
-		}
-
-		map->libbpf_type = LIBBPF_MAP_UNSPEC;
-		map->sec_idx = sym->st_shndx;
-		map->sec_offset = sym->st_value;
-		pr_debug("map '%s' (legacy): at sec_idx %d, offset %zu.\n",
-			 map_name, map->sec_idx, map->sec_offset);
-		if (sym->st_value + map_def_sz > data->d_size) {
-			pr_warn("corrupted maps section in %s: last map \"%s\" too small\n",
-				obj->path, map_name);
-			return -EINVAL;
-		}
-
-		map->name = strdup(map_name);
-		if (!map->name) {
-			pr_warn("map '%s': failed to alloc map name\n", map_name);
-			return -ENOMEM;
-		}
-		pr_debug("map %d is \"%s\"\n", i, map->name);
-		def = (struct bpf_map_def *)(data->d_buf + sym->st_value);
-		/*
-		 * If the definition of the map in the object file fits in
-		 * bpf_map_def, copy it.  Any extra fields in our version
-		 * of bpf_map_def will default to zero as a result of the
-		 * calloc above.
-		 */
-		if (map_def_sz <= sizeof(struct bpf_map_def)) {
-			memcpy(&map->def, def, map_def_sz);
-		} else {
-			/*
-			 * Here the map structure being read is bigger than what
-			 * we expect, truncate if the excess bits are all zero.
-			 * If they are not zero, reject this map as
-			 * incompatible.
-			 */
-			char *b;
-
-			for (b = ((char *)def) + sizeof(struct bpf_map_def);
-			     b < ((char *)def) + map_def_sz; b++) {
-				if (*b != 0) {
-					pr_warn("maps section in %s: \"%s\" has unrecognized, non-zero options\n",
-						obj->path, map_name);
-					if (strict)
-						return -EINVAL;
-				}
-			}
-			memcpy(&map->def, def, sizeof(struct bpf_map_def));
-		}
-
-		/* btf info may not exist but fill it in if it does exist */
-		(void) bpf_map_find_btf_info(obj, map);
-	}
-	return 0;
-}
-
 const struct btf_type *
 skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id)
 {
@@ -2114,6 +2039,7 @@ static const char *__btf_kind_str(__u16 kind)
 	case BTF_KIND_FLOAT: return "float";
 	case BTF_KIND_DECL_TAG: return "decl_tag";
 	case BTF_KIND_TYPE_TAG: return "type_tag";
+	case BTF_KIND_ENUM64: return "enum64";
 	default: return "unknown";
 	}
 }
@@ -2177,6 +2103,13 @@ static int build_map_pin_path(struct bpf_map *map, const char *path)
 	return bpf_map__set_pin_path(map, buf);
 }
 
+/* should match definition in bpf_helpers.h */
+enum libbpf_pin_type {
+	LIBBPF_PIN_NONE,
+	/* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
+	LIBBPF_PIN_BY_NAME,
+};
+
 int parse_btf_map_def(const char *map_name, struct btf *btf,
 		      const struct btf_type *def_t, bool strict,
 		      struct btf_map_def *map_def, struct btf_map_def *inner_def)
@@ -2398,6 +2331,37 @@ int parse_btf_map_def(const char *map_name, struct btf *btf,
 	return 0;
 }
 
+static size_t adjust_ringbuf_sz(size_t sz)
+{
+	__u32 page_sz = sysconf(_SC_PAGE_SIZE);
+	__u32 mul;
+
+	/* if user forgot to set any size, make sure they see error */
+	if (sz == 0)
+		return 0;
+	/* Kernel expects BPF_MAP_TYPE_RINGBUF's max_entries to be
+	 * a power-of-2 multiple of kernel's page size. If user diligently
+	 * satisified these conditions, pass the size through.
+	 */
+	if ((sz % page_sz) == 0 && is_pow_of_2(sz / page_sz))
+		return sz;
+
+	/* Otherwise find closest (page_sz * power_of_2) product bigger than
+	 * user-set size to satisfy both user size request and kernel
+	 * requirements and substitute correct max_entries for map creation.
+	 */
+	for (mul = 1; mul <= UINT_MAX / page_sz; mul <<= 1) {
+		if (mul * page_sz > sz)
+			return mul * page_sz;
+	}
+
+	/* if it's impossible to satisfy the conditions (i.e., user size is
+	 * very close to UINT_MAX but is not a power-of-2 multiple of
+	 * page_size) then just return original size and let kernel reject it
+	 */
+	return sz;
+}
+
 static void fill_map_from_def(struct bpf_map *map, const struct btf_map_def *def)
 {
 	map->def.type = def->map_type;
@@ -2411,6 +2375,10 @@ static void fill_map_from_def(struct bpf_map *map, const struct btf_map_def *def
 	map->btf_key_type_id = def->key_type_id;
 	map->btf_value_type_id = def->value_type_id;
 
+	/* auto-adjust BPF ringbuf map max_entries to be a multiple of page size */
+	if (map->def.type == BPF_MAP_TYPE_RINGBUF)
+		map->def.max_entries = adjust_ringbuf_sz(map->def.max_entries);
+
 	if (def->parts & MAP_DEF_MAP_TYPE)
 		pr_debug("map '%s': found type = %u.\n", map->name, def->map_type);
 
@@ -2609,12 +2577,11 @@ static int bpf_object__init_maps(struct bpf_object *obj,
 {
 	const char *pin_root_path;
 	bool strict;
-	int err;
+	int err = 0;
 
 	strict = !OPTS_GET(opts, relaxed_maps, false);
 	pin_root_path = OPTS_GET(opts, pin_root_path, NULL);
 
-	err = bpf_object__init_user_maps(obj, strict);
 	err = err ?: bpf_object__init_user_btf_maps(obj, strict, pin_root_path);
 	err = err ?: bpf_object__init_global_data_maps(obj);
 	err = err ?: bpf_object__init_kconfig_map(obj);
@@ -2642,12 +2609,13 @@ static bool btf_needs_sanitization(struct bpf_object *obj)
 	bool has_func = kernel_supports(obj, FEAT_BTF_FUNC);
 	bool has_decl_tag = kernel_supports(obj, FEAT_BTF_DECL_TAG);
 	bool has_type_tag = kernel_supports(obj, FEAT_BTF_TYPE_TAG);
+	bool has_enum64 = kernel_supports(obj, FEAT_BTF_ENUM64);
 
 	return !has_func || !has_datasec || !has_func_global || !has_float ||
-	       !has_decl_tag || !has_type_tag;
+	       !has_decl_tag || !has_type_tag || !has_enum64;
 }
 
-static void bpf_object__sanitize_btf(struct bpf_object *obj, struct btf *btf)
+static int bpf_object__sanitize_btf(struct bpf_object *obj, struct btf *btf)
 {
 	bool has_func_global = kernel_supports(obj, FEAT_BTF_GLOBAL_FUNC);
 	bool has_datasec = kernel_supports(obj, FEAT_BTF_DATASEC);
@@ -2655,6 +2623,8 @@ static void bpf_object__sanitize_btf(struct bpf_object *obj, struct btf *btf)
 	bool has_func = kernel_supports(obj, FEAT_BTF_FUNC);
 	bool has_decl_tag = kernel_supports(obj, FEAT_BTF_DECL_TAG);
 	bool has_type_tag = kernel_supports(obj, FEAT_BTF_TYPE_TAG);
+	bool has_enum64 = kernel_supports(obj, FEAT_BTF_ENUM64);
+	int enum64_placeholder_id = 0;
 	struct btf_type *t;
 	int i, j, vlen;
 
@@ -2717,8 +2687,32 @@ static void bpf_object__sanitize_btf(struct bpf_object *obj, struct btf *btf)
 			/* replace TYPE_TAG with a CONST */
 			t->name_off = 0;
 			t->info = BTF_INFO_ENC(BTF_KIND_CONST, 0, 0);
-		}
+		} else if (!has_enum64 && btf_is_enum(t)) {
+			/* clear the kflag */
+			t->info = btf_type_info(btf_kind(t), btf_vlen(t), false);
+		} else if (!has_enum64 && btf_is_enum64(t)) {
+			/* replace ENUM64 with a union */
+			struct btf_member *m;
+
+			if (enum64_placeholder_id == 0) {
+				enum64_placeholder_id = btf__add_int(btf, "enum64_placeholder", 1, 0);
+				if (enum64_placeholder_id < 0)
+					return enum64_placeholder_id;
+
+				t = (struct btf_type *)btf__type_by_id(btf, i);
+			}
+
+			m = btf_members(t);
+			vlen = btf_vlen(t);
+			t->info = BTF_INFO_ENC(BTF_KIND_UNION, 0, vlen);
+			for (j = 0; j < vlen; j++, m++) {
+				m->type = enum64_placeholder_id;
+				m->offset = 0;
+			}
+                }
 	}
+
+	return 0;
 }
 
 static bool libbpf_needs_btf(const struct bpf_object *obj)
@@ -2905,11 +2899,6 @@ static int btf_finalize_data(struct bpf_object *obj, struct btf *btf)
 	return libbpf_err(err);
 }
 
-int btf__finalize_data(struct bpf_object *obj, struct btf *btf)
-{
-	return btf_finalize_data(obj, btf);
-}
-
 static int bpf_object__finalize_btf(struct bpf_object *obj)
 {
 	int err;
@@ -3056,7 +3045,9 @@ static int bpf_object__sanitize_and_load_btf(struct bpf_object *obj)
 
 		/* enforce 8-byte pointers for BPF-targeted BTFs */
 		btf__set_pointer_size(obj->btf, 8);
-		bpf_object__sanitize_btf(obj, kern_btf);
+		err = bpf_object__sanitize_btf(obj, kern_btf);
+		if (err)
+			return err;
 	}
 
 	if (obj->gen_loader) {
@@ -3563,6 +3554,10 @@ static enum kcfg_type find_kcfg_type(const struct btf *btf, int id,
 		if (strcmp(name, "libbpf_tristate"))
 			return KCFG_UNKNOWN;
 		return KCFG_TRISTATE;
+	case BTF_KIND_ENUM64:
+		if (strcmp(name, "libbpf_tristate"))
+			return KCFG_UNKNOWN;
+		return KCFG_TRISTATE;
 	case BTF_KIND_ARRAY:
 		if (btf_array(t)->nelems == 0)
 			return KCFG_UNKNOWN;
@@ -3738,7 +3733,7 @@ static int bpf_object__collect_externs(struct bpf_object *obj)
 			ext->kcfg.type = find_kcfg_type(obj->btf, t->type,
 						        &ext->kcfg.is_signed);
 			if (ext->kcfg.type == KCFG_UNKNOWN) {
-				pr_warn("extern (kcfg) '%s' type is unsupported\n", ext_name);
+				pr_warn("extern (kcfg) '%s': type is unsupported\n", ext_name);
 				return -ENOTSUP;
 			}
 		} else if (strcmp(sec_name, KSYMS_SEC) == 0) {
@@ -3860,41 +3855,8 @@ static int bpf_object__collect_externs(struct bpf_object *obj)
 	return 0;
 }
 
-struct bpf_program *
-bpf_object__find_program_by_title(const struct bpf_object *obj,
-				  const char *title)
+static bool prog_is_subprog(const struct bpf_object *obj, const struct bpf_program *prog)
 {
-	struct bpf_program *pos;
-
-	bpf_object__for_each_program(pos, obj) {
-		if (pos->sec_name && !strcmp(pos->sec_name, title))
-			return pos;
-	}
-	return errno = ENOENT, NULL;
-}
-
-static bool prog_is_subprog(const struct bpf_object *obj,
-			    const struct bpf_program *prog)
-{
-	/* For legacy reasons, libbpf supports an entry-point BPF programs
-	 * without SEC() attribute, i.e., those in the .text section. But if
-	 * there are 2 or more such programs in the .text section, they all
-	 * must be subprograms called from entry-point BPF programs in
-	 * designated SEC()'tions, otherwise there is no way to distinguish
-	 * which of those programs should be loaded vs which are a subprogram.
-	 * Similarly, if there is a function/program in .text and at least one
-	 * other BPF program with custom SEC() attribute, then we just assume
-	 * .text programs are subprograms (even if they are not called from
-	 * other programs), because libbpf never explicitly supported mixing
-	 * SEC()-designated BPF programs and .text entry-point BPF programs.
-	 *
-	 * In libbpf 1.0 strict mode, we always consider .text
-	 * programs to be subprograms.
-	 */
-
-	if (libbpf_mode & LIBBPF_STRICT_SEC_NAME)
-		return prog->sec_idx == obj->efile.text_shndx;
-
 	return prog->sec_idx == obj->efile.text_shndx && obj->nr_programs > 1;
 }
 
@@ -4235,9 +4197,7 @@ bpf_object__collect_prog_relos(struct bpf_object *obj, Elf64_Shdr *shdr, Elf_Dat
 
 static int bpf_map_find_btf_info(struct bpf_object *obj, struct bpf_map *map)
 {
-	struct bpf_map_def *def = &map->def;
-	__u32 key_type_id = 0, value_type_id = 0;
-	int ret;
+	int id;
 
 	if (!obj->btf)
 		return -ENOENT;
@@ -4246,31 +4206,22 @@ static int bpf_map_find_btf_info(struct bpf_object *obj, struct bpf_map *map)
 	 * For struct_ops map, it does not need btf_key_type_id and
 	 * btf_value_type_id.
 	 */
-	if (map->sec_idx == obj->efile.btf_maps_shndx ||
-	    bpf_map__is_struct_ops(map))
+	if (map->sec_idx == obj->efile.btf_maps_shndx || bpf_map__is_struct_ops(map))
 		return 0;
 
-	if (!bpf_map__is_internal(map)) {
-		pr_warn("Use of BPF_ANNOTATE_KV_PAIR is deprecated, use BTF-defined maps in .maps section instead\n");
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-		ret = btf__get_map_kv_tids(obj->btf, map->name, def->key_size,
-					   def->value_size, &key_type_id,
-					   &value_type_id);
-#pragma GCC diagnostic pop
-	} else {
-		/*
-		 * LLVM annotates global data differently in BTF, that is,
-		 * only as '.data', '.bss' or '.rodata'.
-		 */
-		ret = btf__find_by_name(obj->btf, map->real_name);
-	}
-	if (ret < 0)
-		return ret;
+	/*
+	 * LLVM annotates global data differently in BTF, that is,
+	 * only as '.data', '.bss' or '.rodata'.
+	 */
+	if (!bpf_map__is_internal(map))
+		return -ENOENT;
 
-	map->btf_key_type_id = key_type_id;
-	map->btf_value_type_id = bpf_map__is_internal(map) ?
-				 ret : value_type_id;
+	id = btf__find_by_name(obj->btf, map->real_name);
+	if (id < 0)
+		return id;
+
+	map->btf_key_type_id = 0;
+	map->btf_value_type_id = id;
 	return 0;
 }
 
@@ -4327,7 +4278,7 @@ int bpf_map__set_autocreate(struct bpf_map *map, bool autocreate)
 int bpf_map__reuse_fd(struct bpf_map *map, int fd)
 {
 	struct bpf_map_info info = {};
-	__u32 len = sizeof(info);
+	__u32 len = sizeof(info), name_len;
 	int new_fd, err;
 	char *new_name;
 
@@ -4337,7 +4288,12 @@ int bpf_map__reuse_fd(struct bpf_map *map, int fd)
 	if (err)
 		return libbpf_err(err);
 
-	new_name = strdup(info.name);
+	name_len = strlen(info.name);
+	if (name_len == BPF_OBJ_NAME_LEN - 1 && strncmp(map->name, info.name, name_len) == 0)
+		new_name = strdup(map->name);
+	else
+		new_name = strdup(info.name);
+
 	if (!new_name)
 		return libbpf_err(-errno);
 
@@ -4396,18 +4352,16 @@ struct bpf_map *bpf_map__inner_map(struct bpf_map *map)
 
 int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries)
 {
-	if (map->fd >= 0)
+	if (map->obj->loaded)
 		return libbpf_err(-EBUSY);
+
 	map->def.max_entries = max_entries;
-	return 0;
-}
 
-int bpf_map__resize(struct bpf_map *map, __u32 max_entries)
-{
-	if (!map || !max_entries)
-		return libbpf_err(-EINVAL);
+	/* auto-adjust BPF ringbuf map max_entries to be a multiple of page size */
+	if (map->def.type == BPF_MAP_TYPE_RINGBUF)
+		map->def.max_entries = adjust_ringbuf_sz(map->def.max_entries);
 
-	return bpf_map__set_max_entries(map, max_entries);
+	return 0;
 }
 
 static int
@@ -4746,6 +4700,19 @@ static int probe_kern_bpf_cookie(void)
 	return probe_fd(ret);
 }
 
+static int probe_kern_btf_enum64(void)
+{
+	static const char strs[] = "\0enum64";
+	__u32 types[] = {
+		BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_ENUM64, 0, 0), 8),
+	};
+
+	return probe_fd(libbpf__load_raw_btf((char *)types, sizeof(types),
+					     strs, sizeof(strs)));
+}
+
+static int probe_kern_syscall_wrapper(void);
+
 enum kern_feature_result {
 	FEAT_UNKNOWN = 0,
 	FEAT_SUPPORTED = 1,
@@ -4811,6 +4778,12 @@ static struct kern_feature_desc {
 	[FEAT_BPF_COOKIE] = {
 		"BPF cookie support", probe_kern_bpf_cookie,
 	},
+	[FEAT_BTF_ENUM64] = {
+		"BTF_KIND_ENUM64 support", probe_kern_btf_enum64,
+	},
+	[FEAT_SYSCALL_WRAPPER] = {
+		"Kernel using syscall wrapper", probe_kern_syscall_wrapper,
+	},
 };
 
 bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id)
@@ -4943,42 +4916,6 @@ bpf_object__populate_internal_map(struct bpf_object *obj, struct bpf_map *map)
 
 static void bpf_map__destroy(struct bpf_map *map);
 
-static bool is_pow_of_2(size_t x)
-{
-	return x && (x & (x - 1));
-}
-
-static size_t adjust_ringbuf_sz(size_t sz)
-{
-	__u32 page_sz = sysconf(_SC_PAGE_SIZE);
-	__u32 mul;
-
-	/* if user forgot to set any size, make sure they see error */
-	if (sz == 0)
-		return 0;
-	/* Kernel expects BPF_MAP_TYPE_RINGBUF's max_entries to be
-	 * a power-of-2 multiple of kernel's page size. If user diligently
-	 * satisified these conditions, pass the size through.
-	 */
-	if ((sz % page_sz) == 0 && is_pow_of_2(sz / page_sz))
-		return sz;
-
-	/* Otherwise find closest (page_sz * power_of_2) product bigger than
-	 * user-set size to satisfy both user size request and kernel
-	 * requirements and substitute correct max_entries for map creation.
-	 */
-	for (mul = 1; mul <= UINT_MAX / page_sz; mul <<= 1) {
-		if (mul * page_sz > sz)
-			return mul * page_sz;
-	}
-
-	/* if it's impossible to satisfy the conditions (i.e., user size is
-	 * very close to UINT_MAX but is not a power-of-2 multiple of
-	 * page_size) then just return original size and let kernel reject it
-	 */
-	return sz;
-}
-
 static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, bool is_in