Merge branch 'autogen-bpf-helpers'

Andrii Nakryiko says:

====================
This patch set adds ability to auto-generate list of BPF helper definitions.
It relies on existing scripts/bpf_helpers_doc.py and include/uapi/linux/bpf.h
having a well-defined set of comments. bpf_helper_defs.h contains all BPF
helper signatures which stay in sync with latest bpf.h UAPI. This
auto-generated header is included from bpf_helpers.h, while all previously
hand-written BPF helper definitions are simultaneously removed in patch #3.
The end result is less manually maintained and redundant boilerplate code,
while also more consistent and well-documented set of BPF helpers. Generated
helper definitions are completely independent from a specific bpf.h on
a target system, because it doesn't use BPF_FUNC_xxx enums.

v3->v4:
- instead of libbpf's Makefile, integrate with selftest/bpf's Makefile (Alexei);

v2->v3:
- delete bpf_helper_defs.h properly (Alexei);

v1->v2:
- add bpf_helper_defs.h to .gitignore and `make clean` (Alexei).
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

include/uapi/linux/bpf.h

@@ -794,7 +794,7 @@ union bpf_attr {
  * 		A 64-bit integer containing the current GID and UID, and
  * 		created as such: *current_gid* **<< 32 \|** *current_uid*.
  *
- * int bpf_get_current_comm(char *buf, u32 size_of_buf)
+ * int bpf_get_current_comm(void *buf, u32 size_of_buf)
  * 	Description
  * 		Copy the **comm** attribute of the current task into *buf* of
  * 		*size_of_buf*. The **comm** attribute contains the name of
@@ -1023,7 +1023,7 @@ union bpf_attr {
  * 		The realm of the route for the packet associated to *skb*, or 0
  * 		if none was found.
  *
- * int bpf_perf_event_output(struct pt_regs *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
+ * int bpf_perf_event_output(void *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
  * 	Description
  * 		Write raw *data* blob into a special BPF perf event held by
  * 		*map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
@@ -1068,7 +1068,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len)
+ * int bpf_skb_load_bytes(const void *skb, u32 offset, void *to, u32 len)
  * 	Description
  * 		This helper was provided as an easy way to load data from a
  * 		packet. It can be used to load *len* bytes from *offset* from
@@ -1085,7 +1085,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_get_stackid(struct pt_regs *ctx, struct bpf_map *map, u64 flags)
+ * int bpf_get_stackid(void *ctx, struct bpf_map *map, u64 flags)
  * 	Description
  * 		Walk a user or a kernel stack and return its id. To achieve
  * 		this, the helper needs *ctx*, which is a pointer to the context
@@ -1154,7 +1154,7 @@ union bpf_attr {
  * 		The checksum result, or a negative error code in case of
  * 		failure.
  *
- * int bpf_skb_get_tunnel_opt(struct sk_buff *skb, u8 *opt, u32 size)
+ * int bpf_skb_get_tunnel_opt(struct sk_buff *skb, void *opt, u32 size)
  * 	Description
  * 		Retrieve tunnel options metadata for the packet associated to
  * 		*skb*, and store the raw tunnel option data to the buffer *opt*
@@ -1172,7 +1172,7 @@ union bpf_attr {
  * 	Return
  * 		The size of the option data retrieved.
  *
- * int bpf_skb_set_tunnel_opt(struct sk_buff *skb, u8 *opt, u32 size)
+ * int bpf_skb_set_tunnel_opt(struct sk_buff *skb, void *opt, u32 size)
  * 	Description
  * 		Set tunnel options metadata for the packet associated to *skb*
  * 		to the option data contained in the raw buffer *opt* of *size*.
@@ -1511,7 +1511,7 @@ union bpf_attr {
  * 	Return
  * 		0
  *
- * int bpf_setsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, char *optval, int optlen)
+ * int bpf_setsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, void *optval, int optlen)
  * 	Description
  * 		Emulate a call to **setsockopt()** on the socket associated to
  * 		*bpf_socket*, which must be a full socket. The *level* at
@@ -1595,7 +1595,7 @@ union bpf_attr {
  * 	Return
  * 		**XDP_REDIRECT** on success, or **XDP_ABORTED** on error.
  *
- * int bpf_sk_redirect_map(struct bpf_map *map, u32 key, u64 flags)
+ * int bpf_sk_redirect_map(struct sk_buff *skb, struct bpf_map *map, u32 key, u64 flags)
  * 	Description
  * 		Redirect the packet to the socket referenced by *map* (of type
  * 		**BPF_MAP_TYPE_SOCKMAP**) at index *key*. Both ingress and
@@ -1715,7 +1715,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_getsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, char *optval, int optlen)
+ * int bpf_getsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, void *optval, int optlen)
  * 	Description
  * 		Emulate a call to **getsockopt()** on the socket associated to
  * 		*bpf_socket*, which must be a full socket. The *level* at
@@ -1947,7 +1947,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_get_stack(struct pt_regs *regs, void *buf, u32 size, u64 flags)
+ * int bpf_get_stack(void *ctx, void *buf, u32 size, u64 flags)
  * 	Description
  * 		Return a user or a kernel stack in bpf program provided buffer.
  * 		To achieve this, the helper needs *ctx*, which is a pointer
@@ -1980,7 +1980,7 @@ union bpf_attr {
  * 		A non-negative value equal to or less than *size* on success,
  * 		or a negative error in case of failure.
  *
- * int bpf_skb_load_bytes_relative(const struct sk_buff *skb, u32 offset, void *to, u32 len, u32 start_header)
+ * int bpf_skb_load_bytes_relative(const void *skb, u32 offset, void *to, u32 len, u32 start_header)
  * 	Description
  * 		This helper is similar to **bpf_skb_load_bytes**\ () in that
  * 		it provides an easy way to load *len* bytes from *offset*
@@ -2033,7 +2033,7 @@ union bpf_attr {
  *		* > 0 one of **BPF_FIB_LKUP_RET_** codes explaining why the
  *		  packet is not forwarded or needs assist from full stack
  *
- * int bpf_sock_hash_update(struct bpf_sock_ops_kern *skops, struct bpf_map *map, void *key, u64 flags)
+ * int bpf_sock_hash_update(struct bpf_sock_ops *skops, struct bpf_map *map, void *key, u64 flags)
  *	Description
  *		Add an entry to, or update a sockhash *map* referencing sockets.
  *		The *skops* is used as a new value for the entry associated to
@@ -2392,7 +2392,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_msg_push_data(struct sk_buff *skb, u32 start, u32 len, u64 flags)
+ * int bpf_msg_push_data(struct sk_msg_buff *msg, u32 start, u32 len, u64 flags)
  *	Description
  *		For socket policies, insert *len* bytes into *msg* at offset
  *		*start*.
@@ -2408,9 +2408,9 @@ union bpf_attr {
  *	Return
  *		0 on success, or a negative error in case of failure.
  *
- * int bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 pop, u64 flags)
+ * int bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 len, u64 flags)
  *	Description
- *		Will remove *pop* bytes from a *msg* starting at byte *start*.
+ *		Will remove *len* bytes from a *msg* starting at byte *start*.
  *		This may result in **ENOMEM** errors under certain situations if
  *		an allocation and copy are required due to a full ring buffer.
  *		However, the helper will try to avoid doing the allocation
@@ -2505,7 +2505,7 @@ union bpf_attr {
  *		A **struct bpf_tcp_sock** pointer on success, or **NULL** in
  *		case of failure.
  *
- * int bpf_skb_ecn_set_ce(struct sk_buf *skb)
+ * int bpf_skb_ecn_set_ce(struct sk_buff *skb)
  *	Description
  *		Set ECN (Explicit Congestion Notification) field of IP header
  *		to **CE** (Congestion Encountered) if current value is **ECT**

scripts/bpf_helpers_doc.py

@@ -391,6 +391,154 @@ SEE ALSO
 
         print('')
 
+class PrinterHelpers(Printer):
+    """
+    A printer for dumping collected information about helpers as C header to
+    be included from BPF program.
+    @helpers: array of Helper objects to print to standard output
+    """
+
+    type_fwds = [
+            'struct bpf_fib_lookup',
+            'struct bpf_perf_event_data',
+            'struct bpf_perf_event_value',
+            'struct bpf_sock',
+            'struct bpf_sock_addr',
+            'struct bpf_sock_ops',
+            'struct bpf_sock_tuple',
+            'struct bpf_spin_lock',
+            'struct bpf_sysctl',
+            'struct bpf_tcp_sock',
+            'struct bpf_tunnel_key',
+            'struct bpf_xfrm_state',
+            'struct pt_regs',
+            'struct sk_reuseport_md',
+            'struct sockaddr',
+            'struct tcphdr',
+
+            'struct __sk_buff',
+            'struct sk_msg_md',
+            'struct xpd_md',
+    ]
+    known_types = {
+            '...',
+            'void',
+            'const void',
+            'char',
+            'const char',
+            'int',
+            'long',
+            'unsigned long',
+
+            '__be16',
+            '__be32',
+            '__wsum',
+
+            'struct bpf_fib_lookup',
+            'struct bpf_perf_event_data',
+            'struct bpf_perf_event_value',
+            'struct bpf_sock',
+            'struct bpf_sock_addr',
+            'struct bpf_sock_ops',
+            'struct bpf_sock_tuple',
+            'struct bpf_spin_lock',
+            'struct bpf_sysctl',
+            'struct bpf_tcp_sock',
+            'struct bpf_tunnel_key',
+            'struct bpf_xfrm_state',
+            'struct pt_regs',
+            'struct sk_reuseport_md',
+            'struct sockaddr',
+            'struct tcphdr',
+    }
+    mapped_types = {
+            'u8': '__u8',
+            'u16': '__u16',
+            'u32': '__u32',
+            'u64': '__u64',
+            's8': '__s8',
+            's16': '__s16',
+            's32': '__s32',
+            's64': '__s64',
+            'size_t': 'unsigned long',
+            'struct bpf_map': 'void',
+            'struct sk_buff': 'struct __sk_buff',
+            'const struct sk_buff': 'const struct __sk_buff',
+            'struct sk_msg_buff': 'struct sk_msg_md',
+            'struct xdp_buff': 'struct xdp_md',
+    }
+
+    def print_header(self):
+        header = '''\
+/* This is auto-generated file. See bpf_helpers_doc.py for details. */
+
+/* Forward declarations of BPF structs */'''
+
+        print(header)
+        for fwd in self.type_fwds:
+            print('%s;' % fwd)
+        print('')
+
+    def print_footer(self):
+        footer = ''
+        print(footer)
+
+    def map_type(self, t):
+        if t in self.known_types:
+            return t
+        if t in self.mapped_types:
+            return self.mapped_types[t]
+        print("")
+        print("Unrecognized type '%s', please add it to known types!" % t)
+        sys.exit(1)
+
+    seen_helpers = set()
+
+    def print_one(self, helper):
+        proto = helper.proto_break_down()
+
+        if proto['name'] in self.seen_helpers:
+            return
+        self.seen_helpers.add(proto['name'])
+
+        print('/*')
+        print(" * %s" % proto['name'])
+        print(" *")
+        if (helper.desc):
+            # Do not strip all newline characters: formatted code at the end of
+            # a section must be followed by a blank line.
+            for line in re.sub('\n$', '', helper.desc, count=1).split('\n'):
+                print(' *{}{}'.format(' \t' if line else '', line))
+
+        if (helper.ret):
+            print(' *')
+            print(' * Returns')
+            for line in helper.ret.rstrip().split('\n'):
+                print(' *{}{}'.format(' \t' if line else '', line))
+
+        print(' */')
+        print('static %s %s(*%s)(' % (self.map_type(proto['ret_type']),
+                                      proto['ret_star'], proto['name']), end='')
+        comma = ''
+        for i, a in enumerate(proto['args']):
+            t = a['type']
+            n = a['name']
+            if proto['name'] == 'bpf_get_socket_cookie' and i == 0:
+                    t = 'void'
+                    n = 'ctx'
+            one_arg = '{}{}'.format(comma, self.map_type(t))
+            if n:
+                if a['star']:
+                    one_arg += ' {}'.format(a['star'])
+                else:
+                    one_arg += ' '
+                one_arg += '{}'.format(n)
+            comma = ', '
+            print(one_arg, end='')
+
+        print(') = (void *) %d;' % len(self.seen_helpers))
+        print('')
+
 ###############################################################################
 
 # If script is launched from scripts/ from kernel tree and can access
@@ -405,6 +553,8 @@ Parse eBPF header file and generate documentation for eBPF helper functions.
 The RST-formatted output produced can be turned into a manual page with the
 rst2man utility.
 """)
+argParser.add_argument('--header', action='store_true',
+                       help='generate C header file')
 if (os.path.isfile(bpfh)):
     argParser.add_argument('--filename', help='path to include/uapi/linux/bpf.h',
                            default=bpfh)
@@ -417,5 +567,8 @@ headerParser = HeaderParser(args.filename)
 headerParser.run()
 
 # Print formatted output to standard output.
-printer = PrinterRST(headerParser.helpers)
+if args.header:
+    printer = PrinterHelpers(headerParser.helpers)
+else:
+    printer = PrinterRST(headerParser.helpers)
 printer.print_all()

tools/include/uapi/linux/bpf.h

@@ -794,7 +794,7 @@ union bpf_attr {
  * 		A 64-bit integer containing the current GID and UID, and
  * 		created as such: *current_gid* **<< 32 \|** *current_uid*.
  *
- * int bpf_get_current_comm(char *buf, u32 size_of_buf)
+ * int bpf_get_current_comm(void *buf, u32 size_of_buf)
  * 	Description
  * 		Copy the **comm** attribute of the current task into *buf* of
  * 		*size_of_buf*. The **comm** attribute contains the name of
@@ -1023,7 +1023,7 @@ union bpf_attr {
  * 		The realm of the route for the packet associated to *skb*, or 0
  * 		if none was found.
  *
- * int bpf_perf_event_output(struct pt_regs *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
+ * int bpf_perf_event_output(void *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
  * 	Description
  * 		Write raw *data* blob into a special BPF perf event held by
  * 		*map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
@@ -1068,7 +1068,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len)
+ * int bpf_skb_load_bytes(const void *skb, u32 offset, void *to, u32 len)
  * 	Description
  * 		This helper was provided as an easy way to load data from a
  * 		packet. It can be used to load *len* bytes from *offset* from
@@ -1085,7 +1085,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_get_stackid(struct pt_regs *ctx, struct bpf_map *map, u64 flags)
+ * int bpf_get_stackid(void *ctx, struct bpf_map *map, u64 flags)
  * 	Description
  * 		Walk a user or a kernel stack and return its id. To achieve
  * 		this, the helper needs *ctx*, which is a pointer to the context
@@ -1154,7 +1154,7 @@ union bpf_attr {
  * 		The checksum result, or a negative error code in case of
  * 		failure.
  *
- * int bpf_skb_get_tunnel_opt(struct sk_buff *skb, u8 *opt, u32 size)
+ * int bpf_skb_get_tunnel_opt(struct sk_buff *skb, void *opt, u32 size)
  * 	Description
  * 		Retrieve tunnel options metadata for the packet associated to
  * 		*skb*, and store the raw tunnel option data to the buffer *opt*
@@ -1172,7 +1172,7 @@ union bpf_attr {
  * 	Return
  * 		The size of the option data retrieved.
  *
- * int bpf_skb_set_tunnel_opt(struct sk_buff *skb, u8 *opt, u32 size)
+ * int bpf_skb_set_tunnel_opt(struct sk_buff *skb, void *opt, u32 size)
  * 	Description
  * 		Set tunnel options metadata for the packet associated to *skb*
  * 		to the option data contained in the raw buffer *opt* of *size*.
@@ -1511,7 +1511,7 @@ union bpf_attr {
  * 	Return
  * 		0
  *
- * int bpf_setsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, char *optval, int optlen)
+ * int bpf_setsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, void *optval, int optlen)
  * 	Description
  * 		Emulate a call to **setsockopt()** on the socket associated to
  * 		*bpf_socket*, which must be a full socket. The *level* at
@@ -1595,7 +1595,7 @@ union bpf_attr {
  * 	Return
  * 		**XDP_REDIRECT** on success, or **XDP_ABORTED** on error.
  *
- * int bpf_sk_redirect_map(struct bpf_map *map, u32 key, u64 flags)
+ * int bpf_sk_redirect_map(struct sk_buff *skb, struct bpf_map *map, u32 key, u64 flags)
  * 	Description
  * 		Redirect the packet to the socket referenced by *map* (of type
  * 		**BPF_MAP_TYPE_SOCKMAP**) at index *key*. Both ingress and
@@ -1715,7 +1715,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_getsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, char *optval, int optlen)
+ * int bpf_getsockopt(struct bpf_sock_ops *bpf_socket, int level, int optname, void *optval, int optlen)
  * 	Description
  * 		Emulate a call to **getsockopt()** on the socket associated to
  * 		*bpf_socket*, which must be a full socket. The *level* at
@@ -1947,7 +1947,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_get_stack(struct pt_regs *regs, void *buf, u32 size, u64 flags)
+ * int bpf_get_stack(void *ctx, void *buf, u32 size, u64 flags)
  * 	Description
  * 		Return a user or a kernel stack in bpf program provided buffer.
  * 		To achieve this, the helper needs *ctx*, which is a pointer
@@ -1980,7 +1980,7 @@ union bpf_attr {
  * 		A non-negative value equal to or less than *size* on success,
  * 		or a negative error in case of failure.
  *
- * int bpf_skb_load_bytes_relative(const struct sk_buff *skb, u32 offset, void *to, u32 len, u32 start_header)
+ * int bpf_skb_load_bytes_relative(const void *skb, u32 offset, void *to, u32 len, u32 start_header)
  * 	Description
  * 		This helper is similar to **bpf_skb_load_bytes**\ () in that
  * 		it provides an easy way to load *len* bytes from *offset*
@@ -2033,7 +2033,7 @@ union bpf_attr {
  *		* > 0 one of **BPF_FIB_LKUP_RET_** codes explaining why the
  *		  packet is not forwarded or needs assist from full stack
  *
- * int bpf_sock_hash_update(struct bpf_sock_ops_kern *skops, struct bpf_map *map, void *key, u64 flags)
+ * int bpf_sock_hash_update(struct bpf_sock_ops *skops, struct bpf_map *map, void *key, u64 flags)
  *	Description
  *		Add an entry to, or update a sockhash *map* referencing sockets.
  *		The *skops* is used as a new value for the entry associated to
@@ -2392,7 +2392,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * int bpf_msg_push_data(struct sk_buff *skb, u32 start, u32 len, u64 flags)
+ * int bpf_msg_push_data(struct sk_msg_buff *msg, u32 start, u32 len, u64 flags)
  *	Description
  *		For socket policies, insert *len* bytes into *msg* at offset
  *		*start*.
@@ -2408,9 +2408,9 @@ union bpf_attr {
  *	Return
  *		0 on success, or a negative error in case of failure.
  *
- * int bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 pop, u64 flags)
+ * int bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 len, u64 flags)
  *	Description
- *		Will remove *pop* bytes from a *msg* starting at byte *start*.
+ *		Will remove *len* bytes from a *msg* starting at byte *start*.
  *		This may result in **ENOMEM** errors under certain situations if
  *		an allocation and copy are required due to a full ring buffer.
  *		However, the helper will try to avoid doing the allocation
@@ -2505,7 +2505,7 @@ union bpf_attr {
  *		A **struct bpf_tcp_sock** pointer on success, or **NULL** in
  *		case of failure.
  *
- * int bpf_skb_ecn_set_ce(struct sk_buf *skb)
+ * int bpf_skb_ecn_set_ce(struct sk_buff *skb)
  *	Description
  *		Set ECN (Explicit Congestion Notification) field of IP header
  *		to **CE** (Congestion Encountered) if current value is **ECT**

tools/testing/selftests/bpf/.gitignore

@@ -39,3 +39,4 @@ libbpf.so.*
 test_hashmap
 test_btf_dump
 xdping
+/bpf_helper_defs.h

tools/testing/selftests/bpf/Makefile

@@ -90,6 +90,10 @@ include ../lib.mk
 TEST_CUSTOM_PROGS = $(OUTPUT)/urandom_read
 all: $(TEST_CUSTOM_PROGS)
 
+bpf_helper_defs.h: $(APIDIR)/linux/bpf.h
+	$(BPFDIR)/../../../scripts/bpf_helpers_doc.py --header 		\
+		--file $(APIDIR)/linux/bpf.h > bpf_helper_defs.h
+
 $(OUTPUT)/urandom_read: $(OUTPUT)/%: %.c
 	$(CC) -o $@ $< -Wl,--build-id
 
@@ -123,7 +127,7 @@ $(OUTPUT)/test_cgroup_attach: cgroup_helpers.c
 # force a rebuild of BPFOBJ when its dependencies are updated
 force:
 
-$(BPFOBJ): force
+$(BPFOBJ): force bpf_helper_defs.h
 	$(MAKE) -C $(BPFDIR) OUTPUT=$(OUTPUT)/
 
 PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)
@@ -319,4 +323,4 @@ $(VERIFIER_TESTS_H): $(VERIFIER_TEST_FILES) | $(VERIFIER_TESTS_DIR)
 
 EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(ALU32_BUILD_DIR) $(BPF_GCC_BUILD_DIR) \
 	$(VERIFIER_TESTS_H) $(PROG_TESTS_H) $(MAP_TESTS_H) \
-	feature
+	feature bpf_helper_defs.h

tools/testing/selftests/bpf/bpf_helpers.h

@@ -2,6 +2,8 @@
 #ifndef __BPF_HELPERS__
 #define __BPF_HELPERS__
 
+#include "bpf_helper_defs.h"
+
 #define __uint(name, val) int (*name)[val]
 #define __type(name, val) typeof(val) *name
 
@@ -21,219 +23,6 @@
  */
 #define SEC(NAME) __attribute__((section(NAME), used))
 
-/* helper functions called from eBPF programs written in C */
-static void *(*bpf_map_lookup_elem)(void *map, const void *key) =
-	(void *) BPF_FUNC_map_lookup_elem;
-static int (*bpf_map_update_elem)(void *map, const void *key, const void *value,
-				  unsigned long long flags) =
-	(void *) BPF_FUNC_map_update_elem;
-static int (*bpf_map_delete_elem)(void *map, const void *key) =
-	(void *) BPF_FUNC_map_delete_elem;
-static int (*bpf_map_push_elem)(void *map, const void *value,
-				unsigned long long flags) =
-	(void *) BPF_FUNC_map_push_elem;
-static int (*bpf_map_pop_elem)(void *map, void *value) =
-	(void *) BPF_FUNC_map_pop_elem;
-static int (*bpf_map_peek_elem)(void *map, void *value) =
-	(void *) BPF_FUNC_map_peek_elem;
-static int (*bpf_probe_read)(void *dst, int size, const void *unsafe_ptr) =
-	(void *) BPF_FUNC_probe_read;
-static unsigned long long (*bpf_ktime_get_ns)(void) =
-	(void *) BPF_FUNC_ktime_get_ns;
-static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
-	(void *) BPF_FUNC_trace_printk;
-static void (*bpf_tail_call)(void *ctx, void *map, int index) =
-	(void *) BPF_FUNC_tail_call;
-static unsigned long long (*bpf_get_smp_processor_id)(void) =
-	(void *) BPF_FUNC_get_smp_processor_id;
-static unsigned long long (*bpf_get_current_pid_tgid)(void) =
-	(void *) BPF_FUNC_get_current_pid_tgid;
-static unsigned long long (*bpf_get_current_uid_gid)(void) =
-	(void *) BPF_FUNC_get_current_uid_gid;
-static int (*bpf_get_current_comm)(void *buf, int buf_size) =
-	(void *) BPF_FUNC_get_current_comm;
-static unsigned long long (*bpf_perf_event_read)(void *map,
-						 unsigned long long flags) =
-	(void *) BPF_FUNC_perf_event_read;
-static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
-	(void *) BPF_FUNC_clone_redirect;
-static int (*bpf_redirect)(int ifindex, int flags) =
-	(void *) BPF_FUNC_redirect;
-static int (*bpf_redirect_map)(void *map, int key, int flags) =
-	(void *) BPF_FUNC_redirect_map;
-static int (*bpf_perf_event_output)(void *ctx, void *map,
-				    unsigned long long flags, void *data,
-				    int size) =
-	(void *) BPF_FUNC_perf_event_output;
-static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
-	(void *) BPF_FUNC_get_stackid;
-static int (*bpf_probe_write_user)(void *dst, const void *src, int size) =
-	(void *) BPF_FUNC_probe_write_user;
-static int (*bpf_current_task_under_cgroup)(void *map, int index) =
-	(void *) BPF_FUNC_current_task_under_cgroup;
-static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
-	(void *) BPF_FUNC_skb_get_tunnel_key;
-static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
-	(void *) BPF_FUNC_skb_set_tunnel_key;
-static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
-	(void *) BPF_FUNC_skb_get_tunnel_opt;
-static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
-	(void *) BPF_FUNC_skb_set_tunnel_opt;
-static unsigned long long (*bpf_get_prandom_u32)(void) =
-	(void *) BPF_FUNC_get_prandom_u32;
-static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
-	(void *) BPF_FUNC_xdp_adjust_head;
-static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) =
-	(void *) BPF_FUNC_xdp_adjust_meta;
-static int (*bpf_get_socket_cookie)(void *ctx) =
-	(void *) BPF_FUNC_get_socket_cookie;
-static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
-			     int optlen) =
-	(void *) BPF_FUNC_setsockopt;
-static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
-			     int optlen) =
-	(void *) BPF_FUNC_getsockopt;
-static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) =
-	(void *) BPF_FUNC_sock_ops_cb_flags_set;
-static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
-	(void *) BPF_FUNC_sk_redirect_map;
-static int (*bpf_sk_redirect_hash)(void *ctx, void *map, void *key, int flags) =
-	(void *) BPF_FUNC_sk_redirect_hash;
-static int (*bpf_sock_map_update)(void *map, void *key, void *value,
-				  unsigned long long flags) =
-	(void *) BPF_FUNC_sock_map_update;
-static int (*bpf_sock_hash_update)(void *map, void *key, void *value,
-				   unsigned long long flags) =
-	(void *) BPF_FUNC_sock_hash_update;
-static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
-					void *buf, unsigned int buf_size) =
-	(void *) BPF_FUNC_perf_event_read_value;
-static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
-				       unsigned int buf_size) =
-	(void *) BPF_FUNC_perf_prog_read_value;
-static int (*bpf_override_return)(void *ctx, unsigned long rc) =
-	(void *) BPF_FUNC_override_return;
-static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) =
-	(void *) BPF_FUNC_msg_redirect_map;
-static int (*bpf_msg_redirect_hash)(void *ctx,
-				    void *map, void *key, int flags) =
-	(void *) BPF_FUNC_msg_redirect_hash;
-static int (*bpf_msg_apply_bytes)(void *ctx, int len) =
-	(void *) BPF_FUNC_msg_apply_bytes;
-static int (*bpf_msg_cork_bytes)(void *ctx, int len) =
-	(void *) BPF_FUNC_msg_cork_bytes;
-static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =
-	(void *) BPF_FUNC_msg_pull_data;
-static int (*bpf_msg_push_data)(void *ctx, int start, int end, int flags) =
-	(void *) BPF_FUNC_msg_push_data;
-static int (*bpf_msg_pop_data)(void *ctx, int start, int cut, int flags) =
-	(void *) BPF_FUNC_msg_pop_data;
-static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =
-	(void *) BPF_FUNC_bind;
-static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =
-	(void *) BPF_FUNC_xdp_adjust_tail;
-static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state,
-				     int size, int flags) =
-	(void *) BPF_FUNC_skb_get_xfrm_state;
-static int (*bpf_sk_select_reuseport)(void *ctx, void *map, void *key, __u32 flags) =
-	(void *) BPF_FUNC_sk_select_reuseport;
-static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =
-	(void *) BPF_FUNC_get_stack;
-static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params,
-			     int plen, __u32 flags) =
-	(void *) BPF_FUNC_fib_lookup;
-static int (*bpf_lwt_push_encap)(void *ctx, unsigned int type, void *hdr,
-				 unsigned int len) =
-	(void *) BPF_FUNC_lwt_push_encap;
-static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset,
-				       void *from, unsigned int len) =
-	(void *) BPF_FUNC_lwt_seg6_store_bytes;
-static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param,
-				  unsigned int param_len) =
-	(void *) BPF_FUNC_lwt_seg6_action;
-static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset,
-				      unsigned int len) =
-	(void *) BPF_FUNC_lwt_seg6_adjust_srh;
-static int (*bpf_rc_repeat)(void *ctx) =
-	(void *) BPF_FUNC_rc_repeat;
-static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
-			     unsigned long long scancode, unsigned int toggle) =
-	(void *) BPF_FUNC_rc_keydown;
-static unsigned long long (*bpf_get_current_cgroup_id)(void) =
-	(void *) BPF_FUNC_get_current_cgroup_id;
-static void *(*bpf_get_local_storage)(void *map, unsigned long long flags) =
-	(void *) BPF_FUNC_get_local_storage;
-static unsigned long long (*bpf_skb_cgroup_id)(void *ctx) =
-	(void *) BPF_FUNC_skb_cgroup_id;
-static unsigned long long (*bpf_skb_ancestor_cgroup_id)(void *ctx, int level) =
-	(void *) BPF_FUNC_skb_ancestor_cgroup_id;
-static struct bpf_sock *(*bpf_sk_lookup_tcp)(void *ctx,
-					     struct bpf_sock_tuple *tuple,
-					     int size, unsigned long long netns_id,
-					     unsigned long long flags) =
-	(void *) BPF_FUNC_sk_lookup_tcp;
-static struct bpf_sock *(*bpf_skc_lookup_tcp)(void *ctx,
-					     struct bpf_sock_tuple *tuple,
-					     int size, unsigned long long netns_id,
-					     unsigned long long flags) =
-	(void *) BPF_FUNC_skc_lookup_tcp;
-static struct bpf_sock *(*bpf_sk_lookup_udp)(void *ctx,
-					     struct bpf_sock_tuple *tuple,
-					     int size, unsigned long long netns_id,
-					     unsigned long long flags) =
-	(void *) BPF_FUNC_sk_lookup_udp;
-static int (*bpf_sk_release)(struct bpf_sock *sk) =
-	(void *) BPF_FUNC_sk_release;
-static int (*bpf_skb_vlan_push)(void *ctx, __be16 vlan_proto, __u16 vlan_tci) =
-	(void *) BPF_FUNC_skb_vlan_push;
-static int (*bpf_skb_vlan_pop)(void *ctx) =
-	(void *) BPF_FUNC_skb_vlan_pop;
-static int (*bpf_rc_pointer_rel)(void *ctx, int rel_x, int rel_y) =
-	(void *) BPF_FUNC_rc_pointer_rel;
-static void (*bpf_spin_lock)(struct bpf_spin_lock *lock) =
-	(void *) BPF_FUNC_spin_lock;
-static void (*bpf_spin_unlock)(struct bpf_spin_lock *lock) =
-	(void *) BPF_FUNC_spin_unlock;
-static struct bpf_sock *(*bpf_sk_fullsock)(struct bpf_sock *sk) =
-	(void *) BPF_FUNC_sk_fullsock;
-static struct bpf_tcp_sock *(*bpf_tcp_sock)(struct bpf_sock *sk) =
-	(void *) BPF_FUNC_tcp_sock;
-static struct bpf_sock *(*bpf_get_listener_sock)(struct bpf_sock *sk) =
-	(void *) BPF_FUNC_get_listener_sock;
-static int (*bpf_skb_ecn_set_ce)(void *ctx) =
-	(void *) BPF_FUNC_skb_ecn_set_ce;
-static int (*bpf_tcp_check_syncookie)(struct bpf_sock *sk,
-	    void *ip, int ip_len, void *tcp, int tcp_len) =
-	(void *) BPF_FUNC_tcp_check_syncookie;
-static int (*bpf_sysctl_get_name)(void *ctx, char *buf,
-				  unsigned long long buf_len,
-				  unsigned long long flags) =
-	(void *) BPF_FUNC_sysctl_get_name;
-static int (*bpf_sysctl_get_current_value)(void *ctx, char *buf,
-					   unsigned long long buf_len) =
-	(void *) BPF_FUNC_sysctl_get_current_value;
-static int (*bpf_sysctl_get_new_value)(void *ctx, char *buf,
-				       unsigned long long buf_len) =
-	(void *) BPF_FUNC_sysctl_get_new_value;
-static int (*bpf_sysctl_set_new_value)(void *ctx, const char *buf,
-				       unsigned long long buf_len) =
-	(void *) BPF_FUNC_sysctl_set_new_value;
-static int (*bpf_strtol)(const char *buf, unsigned long long buf_len,
-			 unsigned long long flags, long *res) =
-	(void *) BPF_FUNC_strtol;
-static int (*bpf_strtoul)(const char *buf, unsigned long long buf_len,
-			  unsigned long long flags, unsigned long *res) =
-	(void *) BPF_FUNC_strtoul;
-static void *(*bpf_sk_storage_get)(void *map, struct bpf_sock *sk,
-				   void *value, __u64 flags) =
-	(void *) BPF_FUNC_sk_storage_get;
-static int (*bpf_sk_storage_delete)(void *map, struct bpf_sock *sk) =
-	(void *)BPF_FUNC_sk_storage_delete;
-static int (*bpf_send_signal)(unsigned sig) = (void *)BPF_FUNC_send_signal;
-static long long (*bpf_tcp_gen_syncookie)(struct bpf_sock *sk, void *ip,
-					  int ip_len, void *tcp, int tcp_len) =
-	(void *) BPF_FUNC_tcp_gen_syncookie;
-
 /* llvm builtin functions that eBPF C program may use to
  * emit BPF_LD_ABS and BPF_LD_IND instructions
  */
@@ -273,55 +62,6 @@ struct bpf_map_def {
 	__attribute__ ((section(".maps." #name), used))		\
 		____btf_map_##name = { }
 
-static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
-	(void *) BPF_FUNC_skb_load_bytes;
-static int (*bpf_skb_load_bytes_relative)(void *ctx, int off, void *to, int len, __u32 start_header) =
-	(void *) BPF_FUNC_skb_load_bytes_relative;
-static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
-	(void *) BPF_FUNC_skb_store_bytes;
-static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
-	(void *) BPF_FUNC_l3_csum_replace;
-static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
-	(void *) BPF_FUNC_l4_csum_replace;
-static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) =
-	(void *) BPF_FUNC_csum_diff;
-static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
-	(void *) BPF_FUNC_skb_under_cgroup;
-static int (*bpf_skb_change_head)(void *, int len, int flags) =
-	(void *) BPF_FUNC_skb_change_head;
-static int (*bpf_skb_pull_data)(void *, int len) =
-	(void *) BPF_FUNC_skb_pull_data;
-static unsigned int (*bpf_get_cgroup_classid)(void *ctx) =
-	(void *) BPF_FUNC_get_cgroup_classid;
-static unsigned int (*bpf_get_route_realm)(void *ctx) =
-	(void *) BPF_FUNC_get_route_realm;
-static int (*bpf_skb_change_proto)(void *ctx, __be16 proto, __u64 flags) =
-	(void *) BPF_FUNC_skb_change_proto;
-static int (*bpf_skb_change_type)(void *ctx, __u32 type) =
-	(void *) BPF_FUNC_skb_change_type;
-static unsigned int (*bpf_get_hash_recalc)(void *ctx) =
-	(void *) BPF_FUNC_get_hash_recalc;
-static unsigned long long (*bpf_get_current_task)(void) =
-	(void *) BPF_FUNC_get_current_task;
-static int (*bpf_skb_change_tail)(void *ctx, __u32 len, __u64 flags) =
-	(void *) BPF_FUNC_skb_change_tail;
-static long long (*bpf_csum_update)(void *ctx, __u32 csum) =
-	(void *) BPF_FUNC_csum_update;
-static void (*bpf_set_hash_invalid)(void *ctx) =
-	(void *) BPF_FUNC_set_hash_invalid;
-static int (*bpf_get_numa_node_id)(void) =
-	(void *) BPF_FUNC_get_numa_node_id;
-static int (*bpf_probe_read_str)(void *ctx, __u32 size,
-				 const void *unsafe_ptr) =
-	(void *) BPF_FUNC_probe_read_str;
-static unsigned int (*bpf_get_socket_uid)(void *ctx) =
-	(void *) BPF_FUNC_get_socket_uid;
-static unsigned int (*bpf_set_hash)(void *ctx, __u32 hash) =
-	(void *) BPF_FUNC_set_hash;
-static int (*bpf_skb_adjust_room)(void *ctx, __s32 len_diff, __u32 mode,
-				  unsigned long long flags) =
-	(void *) BPF_FUNC_skb_adjust_room;
-
 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */
 #if defined(__TARGET_ARCH_x86)
 	#define bpf_target_x86