sync with latest bpf-next (#11)

Sync latest libbpf sources. Tested against pahole.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>

include/uapi/linux/bpf.h

@@ -2016,6 +2016,19 @@ union bpf_attr {
  *			Only works if *skb* contains an IPv6 packet. Insert a
  *			Segment Routing Header (**struct ipv6_sr_hdr**) inside
  *			the IPv6 header.
+ *		**BPF_LWT_ENCAP_IP**
+ *			IP encapsulation (GRE/GUE/IPIP/etc). The outer header
+ *			must be IPv4 or IPv6, followed by zero or more
+ *			additional headers, up to LWT_BPF_MAX_HEADROOM total
+ *			bytes in all prepended headers. Please note that
+ *			if skb_is_gso(skb) is true, no more than two headers
+ *			can be prepended, and the inner header, if present,
+ *			should be either GRE or UDP/GUE.
+ *
+ *		BPF_LWT_ENCAP_SEG6*** types can be called by bpf programs of
+ *		type BPF_PROG_TYPE_LWT_IN; BPF_LWT_ENCAP_IP type can be called
+ *		by bpf programs of types BPF_PROG_TYPE_LWT_IN and
+ *		BPF_PROG_TYPE_LWT_XMIT.
  *
  * 		A call to this helper is susceptible to change the underlaying
  * 		packet buffer. Therefore, at load time, all checks on pointers
@@ -2329,6 +2342,23 @@ union bpf_attr {
  *		"**y**".
  *	Return
  *		0
+ *
+ * struct bpf_sock *bpf_sk_fullsock(struct bpf_sock *sk)
+ *	Description
+ *		This helper gets a **struct bpf_sock** pointer such
+ *		that all the fields in bpf_sock can be accessed.
+ *	Return
+ *		A **struct bpf_sock** pointer on success, or NULL in
+ *		case of failure.
+ *
+ * struct bpf_tcp_sock *bpf_tcp_sock(struct bpf_sock *sk)
+ *	Description
+ *		This helper gets a **struct bpf_tcp_sock** pointer from a
+ *		**struct bpf_sock** pointer.
+ *
+ *	Return
+ *		A **struct bpf_tcp_sock** pointer on success, or NULL in
+ *		case of failure.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -2425,7 +2455,9 @@ union bpf_attr {
 	FN(msg_pop_data),		\
 	FN(rc_pointer_rel),		\
 	FN(spin_lock),			\
-	FN(spin_unlock),
+	FN(spin_unlock),		\
+	FN(sk_fullsock),		\
+	FN(tcp_sock),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call
@@ -2498,7 +2530,8 @@ enum bpf_hdr_start_off {
 /* Encapsulation type for BPF_FUNC_lwt_push_encap helper. */
 enum bpf_lwt_encap_mode {
 	BPF_LWT_ENCAP_SEG6,
-	BPF_LWT_ENCAP_SEG6_INLINE
+	BPF_LWT_ENCAP_SEG6_INLINE,
+	BPF_LWT_ENCAP_IP,
 };
 
 #define __bpf_md_ptr(type, name)	\
@@ -2545,6 +2578,7 @@ struct __sk_buff {
 	__u64 tstamp;
 	__u32 wire_len;
 	__u32 gso_segs;
+	__bpf_md_ptr(struct bpf_sock *, sk);
 };
 
 struct bpf_tunnel_key {
@@ -2586,7 +2620,15 @@ enum bpf_ret_code {
 	BPF_DROP = 2,
 	/* 3-6 reserved */
 	BPF_REDIRECT = 7,
-	/* >127 are reserved for prog type specific return codes */
+	/* >127 are reserved for prog type specific return codes.
+	 *
+	 * BPF_LWT_REROUTE: used by BPF_PROG_TYPE_LWT_IN and
+	 *    BPF_PROG_TYPE_LWT_XMIT to indicate that skb had been
+	 *    changed and should be routed based on its new L3 header.
+	 *    (This is an L3 redirect, as opposed to L2 redirect
+	 *    represented by BPF_REDIRECT above).
+	 */
+	BPF_LWT_REROUTE = 128,
 };
 
 struct bpf_sock {
@@ -2596,14 +2638,52 @@ struct bpf_sock {
 	__u32 protocol;
 	__u32 mark;
 	__u32 priority;
-	__u32 src_ip4;		/* Allows 1,2,4-byte read.
-				 * Stored in network byte order.
+	/* IP address also allows 1 and 2 bytes access */
+	__u32 src_ip4;
+	__u32 src_ip6[4];
+	__u32 src_port;		/* host byte order */
+	__u32 dst_port;		/* network byte order */
+	__u32 dst_ip4;
+	__u32 dst_ip6[4];
+	__u32 state;
+};
+
+struct bpf_tcp_sock {
+	__u32 snd_cwnd;		/* Sending congestion window		*/
+	__u32 srtt_us;		/* smoothed round trip time << 3 in usecs */
+	__u32 rtt_min;
+	__u32 snd_ssthresh;	/* Slow start size threshold		*/
+	__u32 rcv_nxt;		/* What we want to receive next		*/
+	__u32 snd_nxt;		/* Next sequence we send		*/
+	__u32 snd_una;		/* First byte we want an ack for	*/
+	__u32 mss_cache;	/* Cached effective mss, not including SACKS */
+	__u32 ecn_flags;	/* ECN status bits.			*/
+	__u32 rate_delivered;	/* saved rate sample: packets delivered */
+	__u32 rate_interval_us;	/* saved rate sample: time elapsed */
+	__u32 packets_out;	/* Packets which are "in flight"	*/
+	__u32 retrans_out;	/* Retransmitted packets out		*/
+	__u32 total_retrans;	/* Total retransmits for entire connection */
+	__u32 segs_in;		/* RFC4898 tcpEStatsPerfSegsIn
+				 * total number of segments in.
 				 */
-	__u32 src_ip6[4];	/* Allows 1,2,4-byte read.
-				 * Stored in network byte order.
+	__u32 data_segs_in;	/* RFC4898 tcpEStatsPerfDataSegsIn
+				 * total number of data segments in.
 				 */
-	__u32 src_port;		/* Allows 4-byte read.
-				 * Stored in host byte order
+	__u32 segs_out;		/* RFC4898 tcpEStatsPerfSegsOut
+				 * The total number of segments sent.
+				 */
+	__u32 data_segs_out;	/* RFC4898 tcpEStatsPerfDataSegsOut
+				 * total number of data segments sent.
+				 */
+	__u32 lost_out;		/* Lost packets			*/
+	__u32 sacked_out;	/* SACK'd packets			*/
+	__u64 bytes_received;	/* RFC4898 tcpEStatsAppHCThruOctetsReceived
+				 * sum(delta(rcv_nxt)), or how many bytes
+				 * were acked.
+				 */
+	__u64 bytes_acked;	/* RFC4898 tcpEStatsAppHCThruOctetsAcked
+				 * sum(delta(snd_una)), or how many bytes
+				 * were acked.
 				 */
 };
 

include/uapi/linux/if_link.h

@@ -925,6 +925,7 @@ enum {
 enum {
 	LINK_XSTATS_TYPE_UNSPEC,
 	LINK_XSTATS_TYPE_BRIDGE,
+	LINK_XSTATS_TYPE_BOND,
 	__LINK_XSTATS_TYPE_MAX
 };
 #define LINK_XSTATS_TYPE_MAX (__LINK_XSTATS_TYPE_MAX - 1)

src/bpf.c

@@ -22,7 +22,7 @@
  */
 
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
 #include <memory.h>
 #include <unistd.h>
 #include <asm/unistd.h>
@@ -228,7 +228,7 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
 
 	name_len = load_attr->name ? strlen(load_attr->name) : 0;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.prog_type = load_attr->prog_type;
 	attr.expected_attach_type = load_attr->expected_attach_type;
 	attr.insn_cnt = (__u32)load_attr->insns_cnt;
@@ -340,7 +340,7 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.prog_type = type;
 	attr.insn_cnt = (__u32)insns_cnt;
 	attr.insns = ptr_to_u64(insns);
@@ -360,7 +360,7 @@ int bpf_map_update_elem(int fd, const void *key, const void *value,
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_fd = fd;
 	attr.key = ptr_to_u64(key);
 	attr.value = ptr_to_u64(value);
@@ -373,7 +373,7 @@ int bpf_map_lookup_elem(int fd, const void *key, void *value)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_fd = fd;
 	attr.key = ptr_to_u64(key);
 	attr.value = ptr_to_u64(value);
@@ -385,7 +385,7 @@ int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_fd = fd;
 	attr.key = ptr_to_u64(key);
 	attr.value = ptr_to_u64(value);
@@ -398,7 +398,7 @@ int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_fd = fd;
 	attr.key = ptr_to_u64(key);
 	attr.value = ptr_to_u64(value);
@@ -410,7 +410,7 @@ int bpf_map_delete_elem(int fd, const void *key)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_fd = fd;
 	attr.key = ptr_to_u64(key);
 
@@ -421,7 +421,7 @@ int bpf_map_get_next_key(int fd, const void *key, void *next_key)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_fd = fd;
 	attr.key = ptr_to_u64(key);
 	attr.next_key = ptr_to_u64(next_key);
@@ -433,7 +433,7 @@ int bpf_obj_pin(int fd, const char *pathname)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.pathname = ptr_to_u64((void *)pathname);
 	attr.bpf_fd = fd;
 
@@ -444,7 +444,7 @@ int bpf_obj_get(const char *pathname)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.pathname = ptr_to_u64((void *)pathname);
 
 	return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
@@ -455,7 +455,7 @@ int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.target_fd	   = target_fd;
 	attr.attach_bpf_fd = prog_fd;
 	attr.attach_type   = type;
@@ -468,7 +468,7 @@ int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.target_fd	 = target_fd;
 	attr.attach_type = type;
 
@@ -479,7 +479,7 @@ int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.target_fd	 = target_fd;
 	attr.attach_bpf_fd = prog_fd;
 	attr.attach_type = type;
@@ -493,7 +493,7 @@ int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
 	union bpf_attr attr;
 	int ret;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.query.target_fd	= target_fd;
 	attr.query.attach_type	= type;
 	attr.query.query_flags	= query_flags;
@@ -514,7 +514,7 @@ int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
 	union bpf_attr attr;
 	int ret;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.test.prog_fd = prog_fd;
 	attr.test.data_in = ptr_to_u64(data);
 	attr.test.data_out = ptr_to_u64(data_out);
@@ -539,7 +539,7 @@ int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
 	if (!test_attr->data_out && test_attr->data_size_out > 0)
 		return -EINVAL;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.test.prog_fd = test_attr->prog_fd;
 	attr.test.data_in = ptr_to_u64(test_attr->data_in);
 	attr.test.data_out = ptr_to_u64(test_attr->data_out);
@@ -559,7 +559,7 @@ int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
 	union bpf_attr attr;
 	int err;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.start_id = start_id;
 
 	err = sys_bpf(BPF_PROG_GET_NEXT_ID, &attr, sizeof(attr));
@@ -574,7 +574,7 @@ int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
 	union bpf_attr attr;
 	int err;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.start_id = start_id;
 
 	err = sys_bpf(BPF_MAP_GET_NEXT_ID, &attr, sizeof(attr));
@@ -588,7 +588,7 @@ int bpf_prog_get_fd_by_id(__u32 id)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.prog_id = id;
 
 	return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
@@ -598,7 +598,7 @@ int bpf_map_get_fd_by_id(__u32 id)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.map_id = id;
 
 	return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
@@ -608,7 +608,7 @@ int bpf_btf_get_fd_by_id(__u32 id)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.btf_id = id;
 
 	return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
@@ -619,7 +619,7 @@ int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
 	union bpf_attr attr;
 	int err;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.info.bpf_fd = prog_fd;
 	attr.info.info_len = *info_len;
 	attr.info.info = ptr_to_u64(info);
@@ -635,7 +635,7 @@ int bpf_raw_tracepoint_open(const char *name, int prog_fd)
 {
 	union bpf_attr attr;
 
-	bzero(&attr, sizeof(attr));
+	memset(&attr, 0, sizeof(attr));
 	attr.raw_tracepoint.name = ptr_to_u64(name);
 	attr.raw_tracepoint.prog_fd = prog_fd;
 

src/btf.c

@@ -4,7 +4,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <strings.h>
 #include <unistd.h>
 #include <errno.h>
 #include <linux/err.h>
@@ -42,9 +41,8 @@ struct btf {
 
 struct btf_ext_info {
 	/*
-	 * info points to a deep copy of the individual info section
-	 * (e.g. func_info and line_info) from the .BTF.ext.
-	 * It does not include the __u32 rec_size.
+	 * info points to the individual info section (e.g. func_info and
+	 * line_info) from the .BTF.ext. It does not include the __u32 rec_size.
 	 */
 	void *info;
 	__u32 rec_size;
@@ -52,8 +50,13 @@ struct btf_ext_info {
 };
 
 struct btf_ext {
+	union {
+		struct btf_ext_header *hdr;
+		void *data;
+	};
 	struct btf_ext_info func_info;
 	struct btf_ext_info line_info;
+	__u32 data_size;
 };
 
 struct btf_ext_info_sec {
@@ -367,8 +370,6 @@ void btf__free(struct btf *btf)
 
 struct btf *btf__new(__u8 *data, __u32 size)
 {
-	__u32 log_buf_size = 0;
-	char *log_buf = NULL;
 	struct btf *btf;
 	int err;
 
@@ -378,15 +379,6 @@ struct btf *btf__new(__u8 *data, __u32 size)
 
 	btf->fd = -1;
 
-	log_buf = malloc(BPF_LOG_BUF_SIZE);
-	if (!log_buf) {
-		err = -ENOMEM;
-		goto done;
-	}
-
-	*log_buf = 0;
-	log_buf_size = BPF_LOG_BUF_SIZE;
-
 	btf->data = malloc(size);
 	if (!btf->data) {
 		err = -ENOMEM;
@@ -396,17 +388,6 @@ struct btf *btf__new(__u8 *data, __u32 size)
 	memcpy(btf->data, data, size);
 	btf->data_size = size;
 
-	btf->fd = bpf_load_btf(btf->data, btf->data_size,
-			       log_buf, log_buf_size, false);
-
-	if (btf->fd == -1) {
-		err = -errno;
-		pr_warning("Error loading BTF: %s(%d)\n", strerror(errno), errno);
-		if (log_buf && *log_buf)
-			pr_warning("%s\n", log_buf);
-		goto done;
-	}
-
 	err = btf_parse_hdr(btf);
 	if (err)
 		goto done;
@@ -418,8 +399,6 @@ struct btf *btf__new(__u8 *data, __u32 size)
 	err = btf_parse_type_sec(btf);
 
 done:
-	free(log_buf);
-
 	if (err) {
 		btf__free(btf);
 		return ERR_PTR(err);
@@ -428,16 +407,45 @@ done:
 	return btf;
 }
 
+int btf__load(struct btf *btf)
+{
+	__u32 log_buf_size = BPF_LOG_BUF_SIZE;
+	char *log_buf = NULL;
+	int err = 0;
+
+	if (btf->fd >= 0)
+		return -EEXIST;
+
+	log_buf = malloc(log_buf_size);
+	if (!log_buf)
+		return -ENOMEM;
+
+	*log_buf = 0;
+
+	btf->fd = bpf_load_btf(btf->data, btf->data_size,
+			       log_buf, log_buf_size, false);
+	if (btf->fd < 0) {
+		err = -errno;
+		pr_warning("Error loading BTF: %s(%d)\n", strerror(errno), errno);
+		if (*log_buf)
+			pr_warning("%s\n", log_buf);
+		goto done;
+	}
+
+done:
+	free(log_buf);
+	return err;
+}
+
 int btf__fd(const struct btf *btf)
 {
 	return btf->fd;
 }
 
-void btf__get_strings(const struct btf *btf, const char **strings,
-		      __u32 *str_len)
+const void *btf__get_raw_data(const struct btf *btf, __u32 *size)
 {
-	*strings = btf->strings;
-	*str_len = btf->hdr->str_len;
+	*size = btf->data_size;
+	return btf->data;
 }
 
 const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
@@ -475,7 +483,7 @@ int btf__get_from_id(__u32 id, struct btf **btf)
 		goto exit_free;
 	}
 
-	bzero(ptr, last_size);
+	memset(ptr, 0, last_size);
 	btf_info.btf = ptr_to_u64(ptr);
 	err = bpf_obj_get_info_by_fd(btf_fd, &btf_info, &len);
 
@@ -489,7 +497,7 @@ int btf__get_from_id(__u32 id, struct btf **btf)
 			goto exit_free;
 		}
 		ptr = temp_ptr;
-		bzero(ptr, last_size);
+		memset(ptr, 0, last_size);
 		btf_info.btf = ptr_to_u64(ptr);
 		err = bpf_obj_get_info_by_fd(btf_fd, &btf_info, &len);
 	}
@@ -584,7 +592,7 @@ int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
 	return 0;
 }
 
-struct btf_ext_sec_copy_param {
+struct btf_ext_sec_setup_param {
 	__u32 off;
 	__u32 len;
 	__u32 min_rec_size;
@@ -592,20 +600,14 @@ struct btf_ext_sec_copy_param {
 	const char *desc;
 };
 
-static int btf_ext_copy_info(struct btf_ext *btf_ext,
-			     __u8 *data, __u32 data_size,
-			     struct btf_ext_sec_copy_param *ext_sec)
+static int btf_ext_setup_info(struct btf_ext *btf_ext,
+			      struct btf_ext_sec_setup_param *ext_sec)
 {
-	const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
 	const struct btf_ext_info_sec *sinfo;
 	struct btf_ext_info *ext_info;
 	__u32 info_left, record_size;
 	/* The start of the info sec (including the __u32 record_size). */
-	const void *info;
-
-	/* data and data_size do not include btf_ext_header from now on */
-	data = data + hdr->hdr_len;
-	data_size -= hdr->hdr_len;
+	void *info;
 
 	if (ext_sec->off & 0x03) {
 		pr_debug(".BTF.ext %s section is not aligned to 4 bytes\n",
@@ -613,16 +615,15 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
 		return -EINVAL;
 	}
 
-	if (data_size < ext_sec->off ||
-	    ext_sec->len > data_size - ext_sec->off) {
+	info = btf_ext->data + btf_ext->hdr->hdr_len + ext_sec->off;
+	info_left = ext_sec->len;
+
+	if (btf_ext->data + btf_ext->data_size < info + ext_sec->len) {
 		pr_debug("%s section (off:%u len:%u) is beyond the end of the ELF section .BTF.ext\n",
-		     ext_sec->desc, ext_sec->off, ext_sec->len);
+			 ext_sec->desc, ext_sec->off, ext_sec->len);
 		return -EINVAL;
 	}
 
-	info = data + ext_sec->off;
-	info_left = ext_sec->len;
-
 	/* At least a record size */
 	if (info_left < sizeof(__u32)) {
 		pr_debug(".BTF.ext %s record size not found\n", ext_sec->desc);
@@ -634,7 +635,7 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
 	if (record_size < ext_sec->min_rec_size ||
 	    record_size & 0x03) {
 		pr_debug("%s section in .BTF.ext has invalid record size %u\n",
-		     ext_sec->desc, record_size);
+			 ext_sec->desc, record_size);
 		return -EINVAL;
 	}
 
@@ -680,42 +681,35 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
 	ext_info = ext_sec->ext_info;
 	ext_info->len = ext_sec->len - sizeof(__u32);
 	ext_info->rec_size = record_size;
-	ext_info->info = malloc(ext_info->len);
-	if (!ext_info->info)
-		return -ENOMEM;
-	memcpy(ext_info->info, info + sizeof(__u32), ext_info->len);
+	ext_info->info = info + sizeof(__u32);
 
 	return 0;
 }
 
-static int btf_ext_copy_func_info(struct btf_ext *btf_ext,
-				  __u8 *data, __u32 data_size)
+static int btf_ext_setup_func_info(struct btf_ext *btf_ext)
 {
-	const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
-	struct btf_ext_sec_copy_param param = {
-		.off = hdr->func_info_off,
-		.len = hdr->func_info_len,
+	struct btf_ext_sec_setup_param param = {
+		.off = btf_ext->hdr->func_info_off,
+		.len = btf_ext->hdr->func_info_len,
 		.min_rec_size = sizeof(struct bpf_func_info_min),
 		.ext_info = &btf_ext->func_info,
 		.desc = "func_info"
 	};
 
-	return btf_ext_copy_info(btf_ext, data, data_size, &param);
+	return btf_ext_setup_info(btf_ext, &param);
 }
 
-static int btf_ext_copy_line_info(struct btf_ext *btf_ext,
-				  __u8 *data, __u32 data_size)
+static int btf_ext_setup_line_info(struct btf_ext *btf_ext)
 {
-	const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
-	struct btf_ext_sec_copy_param param = {
-		.off = hdr->line_info_off,
-		.len = hdr->line_info_len,
+	struct btf_ext_sec_setup_param param = {
+		.off = btf_ext->hdr->line_info_off,
+		.len = btf_ext->hdr->line_info_len,
 		.min_rec_size = sizeof(struct bpf_line_info_min),
 		.ext_info = &btf_ext->line_info,
 		.desc = "line_info",
 	};
 
-	return btf_ext_copy_info(btf_ext, data, data_size, &param);
+	return btf_ext_setup_info(btf_ext, &param);
 }
 
 static int btf_ext_parse_hdr(__u8 *data, __u32 data_size)
@@ -755,9 +749,7 @@ void btf_ext__free(struct btf_ext *btf_ext)
 {
 	if (!btf_ext)
 		return;
-
-	free(btf_ext->func_info.info);
-	free(btf_ext->line_info.info);
+	free(btf_ext->data);
 	free(btf_ext);
 }
 
@@ -774,13 +766,23 @@ struct btf_ext *btf_ext__new(__u8 *data, __u32 size)
 	if (!btf_ext)
 		return ERR_PTR(-ENOMEM);
 
-	err = btf_ext_copy_func_info(btf_ext, data, size);
-	if (err) {
-		btf_ext__free(btf_ext);
-		return ERR_PTR(err);
+	btf_ext->data_size = size;
+	btf_ext->data = malloc(size);
+	if (!btf_ext->data) {
+		err = -ENOMEM;
+		goto done;
 	}
+	memcpy(btf_ext->data, data, size);
 
-	err = btf_ext_copy_line_info(btf_ext, data, size);
+	err = btf_ext_setup_func_info(btf_ext);
+	if (err)
+		goto done;
+
+	err = btf_ext_setup_line_info(btf_ext);
+	if (err)
+		goto done;
+
+done:
 	if (err) {
 		btf_ext__free(btf_ext);
 		return ERR_PTR(err);
@@ -789,6 +791,12 @@ struct btf_ext *btf_ext__new(__u8 *data, __u32 size)
 	return btf_ext;
 }
 
+const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, __u32 *size)
+{
+	*size = btf_ext->data_size;
+	return btf_ext->data;
+}
+
 static int btf_ext_reloc_info(const struct btf *btf,
 			      const struct btf_ext_info *ext_info,
 			      const char *sec_name, __u32 insns_cnt,
@@ -837,7 +845,8 @@ static int btf_ext_reloc_info(const struct btf *btf,
 	return -ENOENT;
 }
 
-int btf_ext__reloc_func_info(const struct btf *btf, const struct btf_ext *btf_ext,
+int btf_ext__reloc_func_info(const struct btf *btf,
+			     const struct btf_ext *btf_ext,
 			     const char *sec_name, __u32 insns_cnt,
 			     void **func_info, __u32 *cnt)
 {
@@ -845,7 +854,8 @@ int btf_ext__reloc_func_info(const struct btf *btf, const struct btf_ext *btf_ex
 				  insns_cnt, func_info, cnt);
 }
 
-int btf_ext__reloc_line_info(const struct btf *btf, const struct btf_ext *btf_ext,
+int btf_ext__reloc_line_info(const struct btf *btf,
+			     const struct btf_ext *btf_ext,
 			     const char *sec_name, __u32 insns_cnt,
 			     void **line_info, __u32 *cnt)
 {

src/btf.h

@@ -57,6 +57,7 @@ struct btf_ext_header {
 
 LIBBPF_API void btf__free(struct btf *btf);
 LIBBPF_API struct btf *btf__new(__u8 *data, __u32 size);
+LIBBPF_API int btf__load(struct btf *btf);
 LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
 				   const char *type_name);
 LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf);
@@ -65,8 +66,7 @@ LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
 LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
 LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
 LIBBPF_API int btf__fd(const struct btf *btf);
-LIBBPF_API void btf__get_strings(const struct btf *btf, const char **strings,
-				 __u32 *str_len);
+LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
 LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
 LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
 LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
@@ -76,6 +76,8 @@ LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
 
 LIBBPF_API struct btf_ext *btf_ext__new(__u8 *data, __u32 size);
 LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext);
+LIBBPF_API const void *btf_ext__get_raw_data(const struct btf_ext* btf_ext,
+					     __u32 *size);
 LIBBPF_API int btf_ext__reloc_func_info(const struct btf *btf,
 					const struct btf_ext *btf_ext,
 					const char *sec_name, __u32 insns_cnt,

src/libbpf.c

@@ -18,7 +18,6 @@
 #include <libgen.h>
 #include <inttypes.h>
 #include <string.h>
-#include <strings.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -308,7 +307,7 @@ bpf_program__init(void *data, size_t size, char *section_name, int idx,
 		return -EINVAL;
 	}
 
-	bzero(prog, sizeof(*prog));
+	memset(prog, 0, sizeof(*prog));
 
 	prog->section_name = strdup(section_name);
 	if (!prog->section_name) {
@@ -836,7 +835,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
 			obj->efile.maps_shndx = idx;
 		else if (strcmp(name, BTF_ELF_SEC) == 0) {
 			obj->btf = btf__new(data->d_buf, data->d_size);
-			if (IS_ERR(obj->btf)) {
+			if (IS_ERR(obj->btf) || btf__load(obj->btf)) {
 				pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
 					   BTF_ELF_SEC, PTR_ERR(obj->btf));
 				obj->btf = NULL;
@@ -1577,7 +1576,7 @@ bpf_program__load(struct bpf_program *prog,
 		struct bpf_prog_prep_result result;
 		bpf_program_prep_t preprocessor = prog->preprocessor;
 
-		bzero(&result, sizeof(result));
+		memset(&result, 0, sizeof(result));
 		err = preprocessor(prog, i, prog->insns,
 				   prog->insns_cnt, &result);
 		if (err) {

src/libbpf.map

@@ -136,9 +136,11 @@ LIBBPF_0.0.2 {
 		btf__dedup;
 		btf__get_map_kv_tids;
 		btf__get_nr_types;
-		btf__get_strings;
+		btf__get_raw_data;
+		btf__load;
 		btf_ext__free;
 		btf_ext__func_info_rec_size;
+		btf_ext__get_raw_data;
 		btf_ext__line_info_rec_size;
 		btf_ext__new;
 		btf_ext__reloc_func_info;