On Sun, Jul 10, 2022 at 3:38 AM Jose E. Marchesi <jose.marchesi@xxxxxxxxxx> wrote: > > > > On Sat, Jul 9, 2022 at 4:41 PM Jose E. Marchesi > > <jose.marchesi@xxxxxxxxxx> wrote: > >> > >> > >> > On Sat, Jul 9, 2022 at 2:32 PM James Hilliard <james.hilliard1@xxxxxxxxx> wrote: > >> >> > >> >> On Sat, Jul 9, 2022 at 2:21 PM Jose E. Marchesi > >> >> <jose.marchesi@xxxxxxxxxx> wrote: > >> >> > > >> >> > > >> >> > > On Sat, Jul 9, 2022 at 11:24 AM Jose E. Marchesi > >> >> > > <jose.marchesi@xxxxxxxxxx> wrote: > >> >> > >> > >> >> > >> > >> >> > >> > On Fri, Jul 8, 2022 at 12:33 PM Jose E. Marchesi > >> >> > >> > <jose.marchesi@xxxxxxxxxx> wrote: > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> >> On Wed, Jul 6, 2022 at 10:13 AM James Hilliard > >> >> > >> >> >> <james.hilliard1@xxxxxxxxx> wrote: > >> >> > >> >> >>> > >> >> > >> >> >>> Note I'm testing with the following patches: > >> >> > >> >> >>> https://lore.kernel.org/bpf/20220706111839.1247911-1-james.hilliard1@xxxxxxxxx/ > >> >> > >> >> >>> https://lore.kernel.org/bpf/20220706140623.2917858-1-james.hilliard1@xxxxxxxxx/ > >> >> > >> >> >>> > >> >> > >> >> >>> It would appear there's some compatibility issues with bpftool gen and > >> >> > >> >> >>> GCC, not sure what side though is wrong here: > >> >> > >> >> >>> /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> >> > >> >> >>> gen object src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > >> >> > >> >> >>> src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.unstripped.o > >> >> > >> >> >>> libbpf: failed to find BTF info for global/extern symbol 'sd_restrictif_i' > >> >> > >> >> >>> Error: failed to link > >> >> > >> >> >>> 'src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.unstripped.o': > >> >> > >> >> >>> Unknown error -2 (-2) > >> >> > >> >> >>> > >> >> > >> >> >>> Relevant difference seems to be this: > >> >> > >> >> >>> GCC: > >> >> > >> >> >>> [55] FUNC 'sd_restrictif_i' type_id=47 linkage=static > >> >> > >> >> >>> Clang: > >> >> > >> >> >>> [27] FUNC 'sd_restrictif_i' type_id=26 linkage=global > >> >> > >> >> > > >> >> > >> >> > For functions GCC generates a BTF_KIND_FUNC entry, which has no linkage > >> >> > >> >> > information, or so we thought: I just looked at bpftool/btf.c and I > >> >> > >> >> > found the linkage info for function types is expected to be encoded in > >> >> > >> >> > the vlen field of BTF_KIND_FUNC entries (why not adding a btf_func > >> >> > >> >> > instead???) which is surprising to say the least. > >> >> > >> >> > > >> >> > >> >> > We are changing GCC to encode the linkage info in vlen for these types. > >> >> > >> >> > Thanks for reporting this. > >> >> > >> >> > >> >> > >> >> Patch sent to GCC upstream: > >> >> > >> >> https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598090.html > >> >> > >> > > >> >> > >> > I applied that patch on top of GCC 12.1.0 and it appears to fix the > >> >> > >> > bpftool gen object bug. > >> >> > >> > > >> >> > >> > I am however now hitting a different error during skeleton generation: > >> >> > >> > /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> >> > >> > gen skeleton src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > >> >> > >> > libbpf: elf: skipping unrecognized data section(9) .comment > >> >> > >> > libbpf: failed to alloc map 'restrict.bss' content buffer: -22 > >> >> > >> > Error: failed to open BPF object file: Invalid argument > >> >> > >> > >> >> > >> What is the size of the .bss section in the object file? Try with: > >> >> > >> > >> >> > >> $ size restrict-ifaces.bpf.o > >> >> > > > >> >> > > $ size > >> > output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > >> >> > > text data bss dec hex filename > >> >> > > 386 25 0 411 19b > >> >> > > output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > >> >> > > >> >> > Right, so the .bss section is empty. I see a `const volatile unsigned > >> >> > char is_allow_list = 0;' in restrict-ifaces.bpf.c, but that goes to > >> >> > .data and not to .bss, as expected. > >> >> > > >> >> > If you build restrict-ifaces.bpf.o with LLVM, is the bss still empty? I > >> >> > don't think the code in libbpf.c even checks for this eventuality... > >> >> > >> >> LLVM version(which skeleton generation works with): > >> >> $ size restrict-ifaces.bpf.o > >> >> text data bss dec hex filename > >> >> 323 24 0 347 15b restrict-ifaces.bpf.o > >> >> > >> >> $ /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> >> btf dump file restrict-ifaces.bpf.o format raw > >> >> [1] PTR '(anon)' type_id=3 > >> >> [2] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED > >> >> [3] ARRAY '(anon)' type_id=2 index_type_id=4 nr_elems=1 > >> >> [4] INT '__ARRAY_SIZE_TYPE__' size=4 bits_offset=0 nr_bits=32 encoding=(none) > >> >> [5] PTR '(anon)' type_id=6 > >> >> [6] TYPEDEF '__u32' type_id=7 > >> >> [7] INT 'unsigned int' size=4 bits_offset=0 nr_bits=32 encoding=(none) > >> >> [8] PTR '(anon)' type_id=9 > >> >> [9] TYPEDEF '__u8' type_id=10 > >> >> [10] INT 'unsigned char' size=1 bits_offset=0 nr_bits=8 encoding=(none) > >> >> [11] STRUCT '(anon)' size=24 vlen=3 > >> >> 'type' type_id=1 bits_offset=0 > >> >> 'key' type_id=5 bits_offset=64 > >> >> 'value' type_id=8 bits_offset=128 > >> >> [12] VAR 'sd_restrictif' type_id=11, linkage=global > >> >> [13] PTR '(anon)' type_id=14 > >> >> [14] CONST '(anon)' type_id=15 > >> >> [15] STRUCT '__sk_buff' size=192 vlen=33 > >> >> 'len' type_id=6 bits_offset=0 > >> >> 'pkt_type' type_id=6 bits_offset=32 > >> >> 'mark' type_id=6 bits_offset=64 > >> >> 'queue_mapping' type_id=6 bits_offset=96 > >> >> 'protocol' type_id=6 bits_offset=128 > >> >> 'vlan_present' type_id=6 bits_offset=160 > >> >> 'vlan_tci' type_id=6 bits_offset=192 > >> >> 'vlan_proto' type_id=6 bits_offset=224 > >> >> 'priority' type_id=6 bits_offset=256 > >> >> 'ingress_ifindex' type_id=6 bits_offset=288 > >> >> 'ifindex' type_id=6 bits_offset=320 > >> >> 'tc_index' type_id=6 bits_offset=352 > >> >> 'cb' type_id=16 bits_offset=384 > >> >> 'hash' type_id=6 bits_offset=544 > >> >> 'tc_classid' type_id=6 bits_offset=576 > >> >> 'data' type_id=6 bits_offset=608 > >> >> 'data_end' type_id=6 bits_offset=640 > >> >> 'napi_id' type_id=6 bits_offset=672 > >> >> 'family' type_id=6 bits_offset=704 > >> >> 'remote_ip4' type_id=6 bits_offset=736 > >> >> 'local_ip4' type_id=6 bits_offset=768 > >> >> 'remote_ip6' type_id=17 bits_offset=800 > >> >> 'local_ip6' type_id=17 bits_offset=928 > >> >> 'remote_port' type_id=6 bits_offset=1056 > >> >> 'local_port' type_id=6 bits_offset=1088 > >> >> 'data_meta' type_id=6 bits_offset=1120 > >> >> '(anon)' type_id=18 bits_offset=1152 > >> >> 'tstamp' type_id=20 bits_offset=1216 > >> >> 'wire_len' type_id=6 bits_offset=1280 > >> >> 'gso_segs' type_id=6 bits_offset=1312 > >> >> '(anon)' type_id=22 bits_offset=1344 > >> >> 'gso_size' type_id=6 bits_offset=1408 > >> >> 'hwtstamp' type_id=20 bits_offset=1472 > >> >> [16] ARRAY '(anon)' type_id=6 index_type_id=4 nr_elems=5 > >> >> [17] ARRAY '(anon)' type_id=6 index_type_id=4 nr_elems=4 > >> >> [18] UNION '(anon)' size=8 vlen=1 > >> >> 'flow_keys' type_id=19 bits_offset=0 > >> >> [19] PTR '(anon)' type_id=34 > >> >> [20] TYPEDEF '__u64' type_id=21 > >> >> [21] INT 'unsigned long long' size=8 bits_offset=0 nr_bits=64 encoding=(none) > >> >> [22] UNION '(anon)' size=8 vlen=1 > >> >> 'sk' type_id=23 bits_offset=0 > >> >> [23] PTR '(anon)' type_id=35 > >> >> [24] FUNC_PROTO '(anon)' ret_type_id=2 vlen=1 > >> >> 'sk' type_id=13 > >> >> [25] FUNC 'sd_restrictif_e' type_id=24 linkage=global > >> >> [26] FUNC 'sd_restrictif_i' type_id=24 linkage=global > >> >> [27] CONST '(anon)' type_id=28 > >> >> [28] VOLATILE '(anon)' type_id=9 > >> >> [29] VAR 'is_allow_list' type_id=27, linkage=global > >> >> [30] CONST '(anon)' type_id=31 > >> >> [31] INT 'char' size=1 bits_offset=0 nr_bits=8 encoding=SIGNED > >> >> [32] ARRAY '(anon)' type_id=30 index_type_id=4 nr_elems=18 > >> >> [33] VAR '_license' type_id=32, linkage=static > >> >> [34] FWD 'bpf_flow_keys' fwd_kind=struct > >> >> [35] FWD 'bpf_sock' fwd_kind=struct > >> >> [36] DATASEC '.rodata' size=1 vlen=1 > >> >> type_id=29 offset=0 size=1 (VAR 'is_allow_list') > >> >> [37] DATASEC 'license' size=18 vlen=1 > >> >> type_id=33 offset=0 size=18 (VAR '_license') > >> >> [38] DATASEC '.maps' size=24 vlen=1 > >> >> type_id=12 offset=0 size=24 (VAR 'sd_restrictif') > >> >> > >> > > >> > Skeleton generation debug output for GCC(failing) and LLVM(working) > >> > which may be helpful: > >> > >> Indeed it was helpful :) > >> > >> The GNU assembler generates an empty .bss section. This is a well > >> established behavior in GAS that happens in all supported targets. > >> > >> The LLVM assembler doesn't generate an empty .bss section. > >> > >> bpftool chokes on the empty .bss section. > >> > >> In this case I would suggest to fix bpf_object__init_global_data_maps in > >> order to skip empty sections. > >> > >> Something like this: > > > > Hmm, that seems to segfault: > > Yes, I see in bpf_object__elf_collect that sec_desc->data is not > initialized when a section is not recognized. In this case, this > happens with .comment. > > All right then: > > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c > index e89cc9c885b3..887b78780099 100644 > --- a/tools/lib/bpf/libbpf.c > +++ b/tools/lib/bpf/libbpf.c > @@ -1591,6 +1591,10 @@ static int bpf_object__init_global_data_maps(struct bpf_object *obj) > for (sec_idx = 1; sec_idx < obj->efile.sec_cnt; sec_idx++) { > sec_desc = &obj->efile.secs[sec_idx]; > > + /* Skip recognized sections with size 0. */ > + if (sec_desc->data && sec_desc->data->d_size == 0) > + continue; > + > switch (sec_desc->sec_type) { > case SEC_DATA: > sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx)); Ok, skeleton is now getting generated successfully, however it differs from the clang version so there's a build error when we include/use the header: ../src/core/restrict-ifaces.c: In function ‘prepare_restrict_ifaces_bpf’: ../src/core/restrict-ifaces.c:45:14: error: ‘struct restrict_ifaces_bpf’ has no member named ‘rodata’; did you mean ‘data’? 45 | obj->rodata->is_allow_list = is_allow_list; | ^~~~~~ | data The issue appears to be that clang generates "rodata" members in restrict_ifaces_bpf while with gcc we get "data" members instead. Differences below: GCC: $ /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool --debug gen skeleton output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o libbpf: loading object 'restrict_ifaces_bpf' from buffer libbpf: elf: section(2) .symtab, size 336, link 1, flags 0, type=2 libbpf: elf: section(3) .data, size 1, link 0, flags 3, type=1 libbpf: elf: section(4) .bss, size 0, link 0, flags 3, type=8 libbpf: elf: section(5) cgroup_skb/egress, size 184, link 0, flags 6, type=1 libbpf: sec 'cgroup_skb/egress': found program 'sd_restrictif_e' at insn offset 0 (0 bytes), code size 23 insns (184 bytes) libbpf: elf: section(6) cgroup_skb/ingress, size 184, link 0, flags 6, type=1 libbpf: sec 'cgroup_skb/ingress': found program 'sd_restrictif_i' at insn offset 0 (0 bytes), code size 23 insns (184 bytes) libbpf: elf: section(7) license, size 18, link 0, flags 2, type=1 libbpf: license of restrict_ifaces_bpf is LGPL-2.1-or-later libbpf: elf: section(8) .maps, size 24, link 0, flags 3, type=1 libbpf: elf: section(9) .comment, size 49, link 0, flags 30, type=1 libbpf: elf: skipping unrecognized data section(9) .comment libbpf: elf: section(10) .relcgroup_skb/egress, size 32, link 2, flags 40, type=9 libbpf: elf: section(11) .relcgroup_skb/ingress, size 32, link 2, flags 40, type=9 libbpf: elf: section(12) .BTF, size 3606, link 0, flags 0, type=1 libbpf: looking for externs among 14 symbols... libbpf: collected 0 externs total libbpf: map 'sd_restrictif': at sec_idx 8, offset 0. libbpf: map 'sd_restrictif': found type = 1. libbpf: map 'sd_restrictif': found key [12], sz = 4. libbpf: map 'sd_restrictif': found value [3], sz = 1. libbpf: map 'restrict.data' (global data): at sec_idx 3, offset 0, flags 400. libbpf: map 1 is "restrict.data" libbpf: sec '.relcgroup_skb/egress': collecting relocation for section(5) 'cgroup_skb/egress' libbpf: sec '.relcgroup_skb/egress': relo #0: insn #4 against 'sd_restrictif' libbpf: prog 'sd_restrictif_e': found map 0 (sd_restrictif, sec 8, off 0) for insn #4 libbpf: sec '.relcgroup_skb/egress': relo #1: insn #7 against 'is_allow_list' libbpf: prog 'sd_restrictif_e': found data map 1 (restrict.data, sec 3, off 0) for insn 7 libbpf: sec '.relcgroup_skb/ingress': collecting relocation for section(6) 'cgroup_skb/ingress' libbpf: sec '.relcgroup_skb/ingress': relo #0: insn #4 against 'sd_restrictif' libbpf: prog 'sd_restrictif_i': found map 0 (sd_restrictif, sec 8, off 0) for insn #4 libbpf: sec '.relcgroup_skb/ingress': relo #1: insn #7 against 'is_allow_list' libbpf: prog 'sd_restrictif_i': found data map 1 (restrict.data, sec 3, off 0) for insn 7 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ /* THIS FILE IS AUTOGENERATED BY BPFTOOL! */ #ifndef __RESTRICT_IFACES_BPF_SKEL_H__ #define __RESTRICT_IFACES_BPF_SKEL_H__ #include <errno.h> #include <stdlib.h> #include <bpf/libbpf.h> struct restrict_ifaces_bpf { struct bpf_object_skeleton *skeleton; struct bpf_object *obj; struct { struct bpf_map *sd_restrictif; struct bpf_map *data; } maps; struct { struct bpf_program *sd_restrictif_e; struct bpf_program *sd_restrictif_i; } progs; struct { struct bpf_link *sd_restrictif_e; struct bpf_link *sd_restrictif_i; } links; struct restrict_ifaces_bpf__data { __u8 is_allow_list; } *data; #ifdef __cplusplus static inline struct restrict_ifaces_bpf *open(const struct bpf_object_open_opts *opts = nullptr); static inline struct restrict_ifaces_bpf *open_and_load(); static inline int load(struct restrict_ifaces_bpf *skel); static inline int attach(struct restrict_ifaces_bpf *skel); static inline void detach(struct restrict_ifaces_bpf *skel); static inline void destroy(struct restrict_ifaces_bpf *skel); static inline const void *elf_bytes(size_t *sz); #endif /* __cplusplus */ }; static void restrict_ifaces_bpf__destroy(struct restrict_ifaces_bpf *obj) { if (!obj) return; if (obj->skeleton) bpf_object__destroy_skeleton(obj->skeleton); free(obj); } static inline int restrict_ifaces_bpf__create_skeleton(struct restrict_ifaces_bpf *obj); static inline struct restrict_ifaces_bpf * restrict_ifaces_bpf__open_opts(const struct bpf_object_open_opts *opts) { struct restrict_ifaces_bpf *obj; int err; obj = (struct restrict_ifaces_bpf *)calloc(1, sizeof(*obj)); if (!obj) { errno = ENOMEM; return NULL; } err = restrict_ifaces_bpf__create_skeleton(obj); if (err) goto err_out; err = bpf_object__open_skeleton(obj->skeleton, opts); if (err) goto err_out; return obj; err_out: restrict_ifaces_bpf__destroy(obj); errno = -err; return NULL; } static inline struct restrict_ifaces_bpf * restrict_ifaces_bpf__open(void) { return restrict_ifaces_bpf__open_opts(NULL); } static inline int restrict_ifaces_bpf__load(struct restrict_ifaces_bpf *obj) { return bpf_object__load_skeleton(obj->skeleton); } static inline struct restrict_ifaces_bpf * restrict_ifaces_bpf__open_and_load(void) { struct restrict_ifaces_bpf *obj; int err; obj = restrict_ifaces_bpf__open(); if (!obj) return NULL; err = restrict_ifaces_bpf__load(obj); if (err) { restrict_ifaces_bpf__destroy(obj); errno = -err; return NULL; } return obj; } static inline int restrict_ifaces_bpf__attach(struct restrict_ifaces_bpf *obj) { return bpf_object__attach_skeleton(obj->skeleton); } static inline void restrict_ifaces_bpf__detach(struct restrict_ifaces_bpf *obj) { return bpf_object__detach_skeleton(obj->skeleton); } static inline const void *restrict_ifaces_bpf__elf_bytes(size_t *sz); static inline int restrict_ifaces_bpf__create_skeleton(struct restrict_ifaces_bpf *obj) { struct bpf_object_skeleton *s; int err; s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s)); if (!s) { err = -ENOMEM; goto err; } s->sz = sizeof(*s); s->name = "restrict_ifaces_bpf"; s->obj = &obj->obj; /* maps */ s->map_cnt = 2; s->map_skel_sz = sizeof(*s->maps); s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz); if (!s->maps) { err = -ENOMEM; goto err; } s->maps[0].name = "sd_restrictif"; s->maps[0].map = &obj->maps.sd_restrictif; s->maps[1].name = "restrict.data"; s->maps[1].map = &obj->maps.data; s->maps[1].mmaped = (void **)&obj->data; /* programs */ s->prog_cnt = 2; s->prog_skel_sz = sizeof(*s->progs); s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz); if (!s->progs) { err = -ENOMEM; goto err; } s->progs[0].name = "sd_restrictif_e"; s->progs[0].prog = &obj->progs.sd_restrictif_e; s->progs[0].link = &obj->links.sd_restrictif_e; s->progs[1].name = "sd_restrictif_i"; s->progs[1].prog = &obj->progs.sd_restrictif_i; s->progs[1].link = &obj->links.sd_restrictif_i; s->data = (void *)restrict_ifaces_bpf__elf_bytes(&s->data_sz); obj->skeleton = s; return 0; err: bpf_object__destroy_skeleton(s); return err; } static inline const void *restrict_ifaces_bpf__elf_bytes(size_t *sz) { *sz = 5616; return (const void *)"\ \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\ 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\x18\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x4f\0\0\0\ \x01\0\0\0\x30\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x20\x04\0\0\0\0\0\0\x31\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\xb3\0\0\0\x09\0\0\0\ \x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x58\x04\0\0\0\0\0\0\x20\0\0\0\0\0\0\0\x02\0\ \0\0\x05\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\xc9\0\0\0\x09\0\0\0\x40\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\x78\x04\0\0\0\0\0\0\x20\0\0\0\0\0\0\0\x02\0\0\0\x06\ \0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\xe0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\x98\x04\0\0\0\0\0\0\x16\x0e\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0"; } #ifdef __cplusplus struct restrict_ifaces_bpf *restrict_ifaces_bpf::open(const struct bpf_object_open_opts *opts) { return restrict_ifaces_bpf__open_opts(opts); } struct restrict_ifaces_bpf *restrict_ifaces_bpf::open_and_load() { return restrict_ifaces_bpf__open_and_load(); } int restrict_ifaces_bpf::load(struct restrict_ifaces_bpf *skel) { return restrict_ifaces_bpf__load(skel); } int restrict_ifaces_bpf::attach(struct restrict_ifaces_bpf *skel) { return restrict_ifaces_bpf__attach(skel); } void restrict_ifaces_bpf::detach(struct restrict_ifaces_bpf *skel) { restrict_ifaces_bpf__detach(skel); } void restrict_ifaces_bpf::destroy(struct restrict_ifaces_bpf *skel) { restrict_ifaces_bpf__destroy(skel); } const void *restrict_ifaces_bpf::elf_bytes(size_t *sz) { return restrict_ifaces_bpf__elf_bytes(sz); } #endif /* __cplusplus */ __attribute__((unused)) static void restrict_ifaces_bpf__assert(struct restrict_ifaces_bpf *s __attribute__((unused))) { #ifdef __cplusplus #define _Static_assert static_assert #endif _Static_assert(sizeof(s->data->is_allow_list) == 1, "unexpected size of 'is_allow_list'"); #ifdef __cplusplus #undef _Static_assert #endif } #endif /* __RESTRICT_IFACES_BPF_SKEL_H__ */ Clang: $ /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool --debug gen skeleton restrict-ifaces.bpf.o libbpf: loading object 'restrict_ifaces_bpf' from buffer libbpf: elf: section(2) .symtab, size 384, link 1, flags 0, type=2 libbpf: elf: section(3) cgroup_skb/egress, size 152, link 0, flags 6, type=1 libbpf: sec 'cgroup_skb/egress': found program 'sd_restrictif_e' at insn offset 0 (0 bytes), code size 19 insns (152 bytes) libbpf: elf: section(4) cgroup_skb/ingress, size 152, link 0, flags 6, type=1 libbpf: sec 'cgroup_skb/ingress': found program 'sd_restrictif_i' at insn offset 0 (0 bytes), code size 19 insns (152 bytes) libbpf: elf: section(5) .rodata, size 1, link 0, flags 2, type=1 libbpf: elf: section(6) license, size 18, link 0, flags 2, type=1 libbpf: license of restrict_ifaces_bpf is LGPL-2.1-or-later libbpf: elf: section(7) .maps, size 24, link 0, flags 3, type=1 libbpf: elf: section(8) .relcgroup_skb/egress, size 32, link 2, flags 40, type=9 libbpf: elf: section(9) .relcgroup_skb/ingress, size 32, link 2, flags 40, type=9 libbpf: elf: section(10) .BTF, size 1988, link 0, flags 0, type=1 libbpf: elf: section(11) .BTF.ext, size 376, link 0, flags 0, type=1 libbpf: looking for externs among 16 symbols... libbpf: collected 0 externs total libbpf: map 'sd_restrictif': at sec_idx 7, offset 0. libbpf: map 'sd_restrictif': found type = 1. libbpf: map 'sd_restrictif': found key [6], sz = 4. libbpf: map 'sd_restrictif': found value [9], sz = 1. libbpf: map 'restrict.rodata' (global data): at sec_idx 5, offset 0, flags 480. libbpf: map 1 is "restrict.rodata" libbpf: sec '.relcgroup_skb/egress': collecting relocation for section(3) 'cgroup_skb/egress' libbpf: sec '.relcgroup_skb/egress': relo #0: insn #4 against 'sd_restrictif' libbpf: prog 'sd_restrictif_e': found map 0 (sd_restrictif, sec 7, off 0) for insn #4 libbpf: sec '.relcgroup_skb/egress': relo #1: insn #7 against 'is_allow_list' libbpf: prog 'sd_restrictif_e': found data map 1 (restrict.rodata, sec 5, off 0) for insn 7 libbpf: sec '.relcgroup_skb/ingress': collecting relocation for section(4) 'cgroup_skb/ingress' libbpf: sec '.relcgroup_skb/ingress': relo #0: insn #4 against 'sd_restrictif' libbpf: prog 'sd_restrictif_i': found map 0 (sd_restrictif, sec 7, off 0) for insn #4 libbpf: sec '.relcgroup_skb/ingress': relo #1: insn #7 against 'is_allow_list' libbpf: prog 'sd_restrictif_i': found data map 1 (restrict.rodata, sec 5, off 0) for insn 7 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ /* THIS FILE IS AUTOGENERATED BY BPFTOOL! */ #ifndef __RESTRICT_IFACES_BPF_SKEL_H__ #define __RESTRICT_IFACES_BPF_SKEL_H__ #include <errno.h> #include <stdlib.h> #include <bpf/libbpf.h> struct restrict_ifaces_bpf { struct bpf_object_skeleton *skeleton; struct bpf_object *obj; struct { struct bpf_map *sd_restrictif; struct bpf_map *rodata; } maps; struct { struct bpf_program *sd_restrictif_e; struct bpf_program *sd_restrictif_i; } progs; struct { struct bpf_link *sd_restrictif_e; struct bpf_link *sd_restrictif_i; } links; struct restrict_ifaces_bpf__rodata { __u8 is_allow_list; } *rodata; #ifdef __cplusplus static inline struct restrict_ifaces_bpf *open(const struct bpf_object_open_opts *opts = nullptr); static inline struct restrict_ifaces_bpf *open_and_load(); static inline int load(struct restrict_ifaces_bpf *skel); static inline int attach(struct restrict_ifaces_bpf *skel); static inline void detach(struct restrict_ifaces_bpf *skel); static inline void destroy(struct restrict_ifaces_bpf *skel); static inline const void *elf_bytes(size_t *sz); #endif /* __cplusplus */ }; static void restrict_ifaces_bpf__destroy(struct restrict_ifaces_bpf *obj) { if (!obj) return; if (obj->skeleton) bpf_object__destroy_skeleton(obj->skeleton); free(obj); } static inline int restrict_ifaces_bpf__create_skeleton(struct restrict_ifaces_bpf *obj); static inline struct restrict_ifaces_bpf * restrict_ifaces_bpf__open_opts(const struct bpf_object_open_opts *opts) { struct restrict_ifaces_bpf *obj; int err; obj = (struct restrict_ifaces_bpf *)calloc(1, sizeof(*obj)); if (!obj) { errno = ENOMEM; return NULL; } err = restrict_ifaces_bpf__create_skeleton(obj); if (err) goto err_out; err = bpf_object__open_skeleton(obj->skeleton, opts); if (err) goto err_out; return obj; err_out: restrict_ifaces_bpf__destroy(obj); errno = -err; return NULL; } static inline struct restrict_ifaces_bpf * restrict_ifaces_bpf__open(void) { return restrict_ifaces_bpf__open_opts(NULL); } static inline int restrict_ifaces_bpf__load(struct restrict_ifaces_bpf *obj) { return bpf_object__load_skeleton(obj->skeleton); } static inline struct restrict_ifaces_bpf * restrict_ifaces_bpf__open_and_load(void) { struct restrict_ifaces_bpf *obj; int err; obj = restrict_ifaces_bpf__open(); if (!obj) return NULL; err = restrict_ifaces_bpf__load(obj); if (err) { restrict_ifaces_bpf__destroy(obj); errno = -err; return NULL; } return obj; } static inline int restrict_ifaces_bpf__attach(struct restrict_ifaces_bpf *obj) { return bpf_object__attach_skeleton(obj->skeleton); } static inline void restrict_ifaces_bpf__detach(struct restrict_ifaces_bpf *obj) { return bpf_object__detach_skeleton(obj->skeleton); } static inline const void *restrict_ifaces_bpf__elf_bytes(size_t *sz); static inline int restrict_ifaces_bpf__create_skeleton(struct restrict_ifaces_bpf *obj) { struct bpf_object_skeleton *s; int err; s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s)); if (!s) { err = -ENOMEM; goto err; } s->sz = sizeof(*s); s->name = "restrict_ifaces_bpf"; s->obj = &obj->obj; /* maps */ s->map_cnt = 2; s->map_skel_sz = sizeof(*s->maps); s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz); if (!s->maps) { err = -ENOMEM; goto err; } s->maps[0].name = "sd_restrictif"; s->maps[0].map = &obj->maps.sd_restrictif; s->maps[1].name = "restrict.rodata"; s->maps[1].map = &obj->maps.rodata; s->maps[1].mmaped = (void **)&obj->rodata; /* programs */ s->prog_cnt = 2; s->prog_skel_sz = sizeof(*s->progs); s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz); if (!s->progs) { err = -ENOMEM; goto err; } s->progs[0].name = "sd_restrictif_e"; s->progs[0].prog = &obj->progs.sd_restrictif_e; s->progs[0].link = &obj->links.sd_restrictif_e; s->progs[1].name = "sd_restrictif_i"; s->progs[1].prog = &obj->progs.sd_restrictif_i; s->progs[1].link = &obj->links.sd_restrictif_i; s->data = (void *)restrict_ifaces_bpf__elf_bytes(&s->data_sz); obj->skeleton = s; return 0; err: bpf_object__destroy_skeleton(s); return err; } static inline const void *restrict_ifaces_bpf__elf_bytes(size_t *sz) { *sz = 4272; return (const void *)"\ \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\xb0\x0d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0c\0\ \x01\0\0\x2e\x73\x74\x72\x74\x61\x62\0\x2e\x73\x79\x6d\x74\x61\x62\0\x63\x67\ \x72\x6f\x75\x70\x5f\x73\x6b\x62\x2f\x65\x67\x72\x65\x73\x73\0\x63\x67\x72\x6f\ \x75\x70\x5f\x73\x6b\x62\x2f\x69\x6e\x67\x72\x65\x73\x73\0\x2e\x72\x6f\x64\x61\ 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restrict_ifaces_bpf__load(skel); } int restrict_ifaces_bpf::attach(struct restrict_ifaces_bpf *skel) { return restrict_ifaces_bpf__attach(skel); } void restrict_ifaces_bpf::detach(struct restrict_ifaces_bpf *skel) { restrict_ifaces_bpf__detach(skel); } void restrict_ifaces_bpf::destroy(struct restrict_ifaces_bpf *skel) { restrict_ifaces_bpf__destroy(skel); } const void *restrict_ifaces_bpf::elf_bytes(size_t *sz) { return restrict_ifaces_bpf__elf_bytes(sz); } #endif /* __cplusplus */ __attribute__((unused)) static void restrict_ifaces_bpf__assert(struct restrict_ifaces_bpf *s __attribute__((unused))) { #ifdef __cplusplus #define _Static_assert static_assert #endif _Static_assert(sizeof(s->rodata->is_allow_list) == 1, "unexpected size of 'is_allow_list'"); #ifdef __cplusplus #undef _Static_assert #endif } #endif /* __RESTRICT_IFACES_BPF_SKEL_H__ */ > > > > Starting program: > > /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > > --debug gen skeleton > > output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > > [Thread debugging using libthread_db enabled] > > Using host libthread_db library "/usr/lib/libthread_db.so.1". > > libbpf: loading object 'restrict_ifaces_bpf' from buffer > > libbpf: elf: section(2) .symtab, size 336, link 1, flags 0, type=2 > > libbpf: elf: section(3) .data, size 1, link 0, flags 3, type=1 > > libbpf: elf: section(4) .bss, size 0, link 0, flags 3, type=8 > > libbpf: elf: section(5) cgroup_skb/egress, size 184, link 0, flags 6, type=1 > > libbpf: sec 'cgroup_skb/egress': found program 'sd_restrictif_e' at > > insn offset 0 (0 bytes), code size 23 insns (184 bytes) > > libbpf: elf: section(6) cgroup_skb/ingress, size 184, link 0, flags 6, type=1 > > libbpf: sec 'cgroup_skb/ingress': found program 'sd_restrictif_i' at > > insn offset 0 (0 bytes), code size 23 insns (184 bytes) > > libbpf: elf: section(7) license, size 18, link 0, flags 2, type=1 > > libbpf: license of restrict_ifaces_bpf is LGPL-2.1-or-later > > libbpf: elf: section(8) .maps, size 24, link 0, flags 3, type=1 > > libbpf: elf: section(9) .comment, size 49, link 0, flags 30, type=1 > > libbpf: elf: skipping unrecognized data section(9) .comment > > libbpf: elf: section(10) .relcgroup_skb/egress, size 32, link 2, flags > > 40, type=9 > > libbpf: elf: section(11) .relcgroup_skb/ingress, size 32, link 2, > > flags 40, type=9 > > libbpf: elf: section(12) .BTF, size 3606, link 0, flags 0, type=1 > > libbpf: looking for externs among 14 symbols... > > libbpf: collected 0 externs total > > libbpf: map 'sd_restrictif': at sec_idx 8, offset 0. > > libbpf: map 'sd_restrictif': found type = 1. > > libbpf: map 'sd_restrictif': found key [12], sz = 4. > > libbpf: map 'sd_restrictif': found value [3], sz = 1. > > > > Program received signal SIGSEGV, Segmentation fault. > > 0x0000aaaaaab4fd2c in bpf_object.init_maps () > > (gdb) bt > > #0 0x0000aaaaaab4fd2c in bpf_object.init_maps () > > #1 0x0000aaaaaab52178 in bpf_object_open.part () > > #2 0x0000aaaaaab544e8 in bpf_object.open_mem () > > #3 0x0000aaaaaab2a58c in do_skeleton () > > #4 0x0000aaaaaab1e204 in main () > > > >> > >> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c > >> index e89cc9c885b3..e3a6808f0bb6 100644 > >> --- a/tools/lib/bpf/libbpf.c > >> +++ b/tools/lib/bpf/libbpf.c > >> @@ -1591,6 +1591,10 @@ static int bpf_object__init_global_data_maps(struct bpf_object *obj) > >> for (sec_idx = 1; sec_idx < obj->efile.sec_cnt; sec_idx++) { > >> sec_desc = &obj->efile.secs[sec_idx]; > >> > >> + /* Skip empty sections. */ > >> + if (sec_desc->data->d_size == 0) > >> + continue; > >> + > >> switch (sec_desc->sec_type) { > >> case SEC_DATA: > >> sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx)); > >> > >> > GCC: > >> > $ /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> > --debug gen skeleton > >> > output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > >> > libbpf: loading object 'restrict_ifaces_bpf' from buffer > >> > libbpf: elf: section(2) .symtab, size 336, link 1, flags 0, type=2 > >> > libbpf: elf: section(3) .data, size 1, link 0, flags 3, type=1 > >> > libbpf: elf: section(4) .bss, size 0, link 0, flags 3, type=8 > >> > libbpf: elf: section(5) cgroup_skb/egress, size 184, link 0, flags 6, type=1 > >> > libbpf: sec 'cgroup_skb/egress': found program 'sd_restrictif_e' at > >> > insn offset 0 (0 bytes), code size 23 insns (184 bytes) > >> > libbpf: elf: section(6) cgroup_skb/ingress, size 184, link 0, flags 6, type=1 > >> > libbpf: sec 'cgroup_skb/ingress': found program 'sd_restrictif_i' at > >> > insn offset 0 (0 bytes), code size 23 insns (184 bytes) > >> > libbpf: elf: section(7) license, size 18, link 0, flags 2, type=1 > >> > libbpf: license of restrict_ifaces_bpf is LGPL-2.1-or-later > >> > libbpf: elf: section(8) .maps, size 24, link 0, flags 3, type=1 > >> > libbpf: elf: section(9) .comment, size 49, link 0, flags 30, type=1 > >> > libbpf: elf: skipping unrecognized data section(9) .comment > >> > libbpf: elf: section(10) .relcgroup_skb/egress, size 32, link 2, flags > >> > 40, type=9 > >> > libbpf: elf: section(11) .relcgroup_skb/ingress, size 32, link 2, > >> > flags 40, type=9 > >> > libbpf: elf: section(12) .BTF, size 3606, link 0, flags 0, type=1 > >> > libbpf: looking for externs among 14 symbols... > >> > libbpf: collected 0 externs total > >> > libbpf: map 'sd_restrictif': at sec_idx 8, offset 0. > >> > libbpf: map 'sd_restrictif': found type = 1. > >> > libbpf: map 'sd_restrictif': found key [12], sz = 4. > >> > libbpf: map 'sd_restrictif': found value [3], sz = 1. > >> > libbpf: map 'restrict.data' (global data): at sec_idx 3, offset 0, flags 400. > >> > libbpf: map 1 is "restrict.data" > >> > libbpf: map 'restrict.bss' (global data): at sec_idx 4, offset 0, flags 400. > >> > libbpf: failed to alloc map 'restrict.bss' content buffer: -22 > >> > Error: failed to open BPF object file: Invalid argument > >> > > >> > LLVM: > >> > $ /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> > --debug gen skeleton restrict-ifaces.bpf.o > >> > libbpf: loading object 'restrict_ifaces_bpf' from buffer > >> > libbpf: elf: section(2) .symtab, size 384, link 1, flags 0, type=2 > >> > libbpf: elf: section(3) cgroup_skb/egress, size 152, link 0, flags 6, type=1 > >> > libbpf: sec 'cgroup_skb/egress': found program 'sd_restrictif_e' at > >> > insn offset 0 (0 bytes), code size 19 insns (152 bytes) > >> > libbpf: elf: section(4) cgroup_skb/ingress, size 152, link 0, flags 6, type=1 > >> > libbpf: sec 'cgroup_skb/ingress': found program 'sd_restrictif_i' at > >> > insn offset 0 (0 bytes), code size 19 insns (152 bytes) > >> > libbpf: elf: section(5) .rodata, size 1, link 0, flags 2, type=1 > >> > libbpf: elf: section(6) license, size 18, link 0, flags 2, type=1 > >> > libbpf: license of restrict_ifaces_bpf is LGPL-2.1-or-later > >> > libbpf: elf: section(7) .maps, size 24, link 0, flags 3, type=1 > >> > libbpf: elf: section(8) .relcgroup_skb/egress, size 32, link 2, flags 40, type=9 > >> > libbpf: elf: section(9) .relcgroup_skb/ingress, size 32, link 2, flags > >> > 40, type=9 > >> > libbpf: elf: section(10) .BTF, size 1988, link 0, flags 0, type=1 > >> > libbpf: elf: section(11) .BTF.ext, size 376, link 0, flags 0, type=1 > >> > libbpf: looking for externs among 16 symbols... > >> > libbpf: collected 0 externs total > >> > libbpf: map 'sd_restrictif': at sec_idx 7, offset 0. > >> > libbpf: map 'sd_restrictif': found type = 1. > >> > libbpf: map 'sd_restrictif': found key [6], sz = 4. > >> > libbpf: map 'sd_restrictif': found value [9], sz = 1. > >> > libbpf: map 'restrict.rodata' (global data): at sec_idx 5, offset 0, flags 480. > >> > libbpf: map 1 is "restrict.rodata" > >> > libbpf: sec '.relcgroup_skb/egress': collecting relocation for > >> > section(3) 'cgroup_skb/egress' > >> > libbpf: sec '.relcgroup_skb/egress': relo #0: insn #4 against 'sd_restrictif' > >> > libbpf: prog 'sd_restrictif_e': found map 0 (sd_restrictif, sec 7, off > >> > 0) for insn #4 > >> > libbpf: sec '.relcgroup_skb/egress': relo #1: insn #7 against 'is_allow_list' > >> > libbpf: prog 'sd_restrictif_e': found data map 1 (restrict.rodata, sec > >> > 5, off 0) for insn 7 > >> > libbpf: sec '.relcgroup_skb/ingress': collecting relocation for > >> > section(4) 'cgroup_skb/ingress' > >> > libbpf: sec '.relcgroup_skb/ingress': relo #0: insn #4 against 'sd_restrictif' > >> > libbpf: prog 'sd_restrictif_i': found map 0 (sd_restrictif, sec 7, off > >> > 0) for insn #4 > >> > libbpf: sec '.relcgroup_skb/ingress': relo #1: insn #7 against 'is_allow_list' > >> > libbpf: prog 'sd_restrictif_i': found data map 1 (restrict.rodata, sec > >> > 5, off 0) for insn 7 > >> > > >> >> > > >> >> > >> > >> >> > >> Looking at libbpf.c, it seems to me that this may be due of trying to > >> >> > >> mmap 0 bytes in `bpf_object__init_internal_map': > >> >> > >> > >> >> > >> map->mmaped = mmap(NULL, bpf_map_mmap_sz(map), PROT_READ | PROT_WRITE, > >> >> > >> MAP_SHARED | MAP_ANONYMOUS, -1, 0); > >> >> > >> if (map->mmaped == MAP_FAILED) { > >> >> > >> err = -errno; > >> >> > >> map->mmaped = NULL; > >> >> > >> pr_warn("failed to alloc map '%s' content buffer: %d\n", > >> >> > >> map->name, err); > >> >> > >> zfree(&map->real_name); > >> >> > >> zfree(&map->name); > >> >> > >> return err; > >> >> > >> } > >> >> > >> > >> >> > >> I see no check for zero sized sections in > >> >> > >> bpf_object__init_global_data_maps. > >> >> > >> > >> >> > >> Is maybe GCC failing to allocate stuff in BSS that is supposed to be > >> >> > >> there? > >> >> > >> > >> >> > >> > Stripped file passed to gen skeleton: > >> >> > >> > /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> >> > >> > btf dump file > >> >> > >> > output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.o > >> >> > >> > format raw > >> >> > >> > [1] INT 'signed char' size=1 bits_offset=0 nr_bits=8 encoding=UNKN > >> >> > >> > [2] INT 'unsigned char' size=1 bits_offset=0 nr_bits=8 encoding=CHAR > >> >> > >> > [3] TYPEDEF '__u8' type_id=2 > >> >> > >> > [4] CONST '(anon)' type_id=3 > >> >> > >> > [5] VOLATILE '(anon)' type_id=4 > >> >> > >> > [6] INT 'short int' size=2 bits_offset=0 nr_bits=16 encoding=SIGNED > >> >> > >> > [7] INT 'short unsigned int' size=2 bits_offset=0 nr_bits=16 encoding=(none) > >> >> > >> > [8] TYPEDEF '__u16' type_id=7 > >> >> > >> > [9] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED > >> >> > >> > [10] TYPEDEF '__s32' type_id=9 > >> >> > >> > [11] INT 'unsigned int' size=4 bits_offset=0 nr_bits=32 encoding=(none) > >> >> > >> > [12] TYPEDEF '__u32' type_id=11 > >> >> > >> > [13] INT 'long long int' size=8 bits_offset=0 nr_bits=64 encoding=SIGNED > >> >> > >> > [14] INT 'long long unsigned int' size=8 bits_offset=0 nr_bits=64 > >> >> > >> > encoding=(none) > >> >> > >> > [15] TYPEDEF '__u64' type_id=14 > >> >> > >> > [16] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none) > >> >> > >> > [17] INT 'long int' size=8 bits_offset=0 nr_bits=64 encoding=SIGNED > >> >> > >> > [18] INT 'char' size=1 bits_offset=0 nr_bits=8 encoding=UNKN > >> >> > >> > [19] CONST '(anon)' type_id=18 > >> >> > >> > [20] TYPEDEF '__be16' type_id=8 > >> >> > >> > [21] TYPEDEF '__be32' type_id=12 > >> >> > >> > [22] ENUM 'bpf_map_type' encoding=UNSIGNED size=4 vlen=31 > >> >> > >> > 'BPF_MAP_TYPE_UNSPEC' val=0 > >> >> > >> > 'BPF_MAP_TYPE_HASH' val=1 > >> >> > >> > 'BPF_MAP_TYPE_ARRAY' val=2 > >> >> > >> > 'BPF_MAP_TYPE_PROG_ARRAY' val=3 > >> >> > >> > 'BPF_MAP_TYPE_PERF_EVENT_ARRAY' val=4 > >> >> > >> > 'BPF_MAP_TYPE_PERCPU_HASH' val=5 > >> >> > >> > 'BPF_MAP_TYPE_PERCPU_ARRAY' val=6 > >> >> > >> > 'BPF_MAP_TYPE_STACK_TRACE' val=7 > >> >> > >> > 'BPF_MAP_TYPE_CGROUP_ARRAY' val=8 > >> >> > >> > 'BPF_MAP_TYPE_LRU_HASH' val=9 > >> >> > >> > 'BPF_MAP_TYPE_LRU_PERCPU_HASH' val=10 > >> >> > >> > 'BPF_MAP_TYPE_LPM_TRIE' val=11 > >> >> > >> > 'BPF_MAP_TYPE_ARRAY_OF_MAPS' val=12 > >> >> > >> > 'BPF_MAP_TYPE_HASH_OF_MAPS' val=13 > >> >> > >> > 'BPF_MAP_TYPE_DEVMAP' val=14 > >> >> > >> > 'BPF_MAP_TYPE_SOCKMAP' val=15 > >> >> > >> > 'BPF_MAP_TYPE_CPUMAP' val=16 > >> >> > >> > 'BPF_MAP_TYPE_XSKMAP' val=17 > >> >> > >> > 'BPF_MAP_TYPE_SOCKHASH' val=18 > >> >> > >> > 'BPF_MAP_TYPE_CGROUP_STORAGE' val=19 > >> >> > >> > 'BPF_MAP_TYPE_REUSEPORT_SOCKARRAY' val=20 > >> >> > >> > 'BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE' val=21 > >> >> > >> > 'BPF_MAP_TYPE_QUEUE' val=22 > >> >> > >> > 'BPF_MAP_TYPE_STACK' val=23 > >> >> > >> > 'BPF_MAP_TYPE_SK_STORAGE' val=24 > >> >> > >> > 'BPF_MAP_TYPE_DEVMAP_HASH' val=25 > >> >> > >> > 'BPF_MAP_TYPE_STRUCT_OPS' val=26 > >> >> > >> > 'BPF_MAP_TYPE_RINGBUF' val=27 > >> >> > >> > 'BPF_MAP_TYPE_INODE_STORAGE' val=28 > >> >> > >> > 'BPF_MAP_TYPE_TASK_STORAGE' val=29 > >> >> > >> > 'BPF_MAP_TYPE_BLOOM_FILTER' val=30 > >> >> > >> > [23] UNION '(anon)' size=8 vlen=1 > >> >> > >> > 'flow_keys' type_id=29 bits_offset=0 > >> >> > >> > [24] STRUCT 'bpf_flow_keys' size=56 vlen=13 > >> >> > >> > 'nhoff' type_id=8 bits_offset=0 > >> >> > >> > 'thoff' type_id=8 bits_offset=16 > >> >> > >> > 'addr_proto' type_id=8 bits_offset=32 > >> >> > >> > 'is_frag' type_id=3 bits_offset=48 > >> >> > >> > 'is_first_frag' type_id=3 bits_offset=56 > >> >> > >> > 'is_encap' type_id=3 bits_offset=64 > >> >> > >> > 'ip_proto' type_id=3 bits_offset=72 > >> >> > >> > 'n_proto' type_id=20 bits_offset=80 > >> >> > >> > 'sport' type_id=20 bits_offset=96 > >> >> > >> > 'dport' type_id=20 bits_offset=112 > >> >> > >> > '(anon)' type_id=25 bits_offset=128 > >> >> > >> > 'flags' type_id=12 bits_offset=384 > >> >> > >> > 'flow_label' type_id=21 bits_offset=416 > >> >> > >> > [25] UNION '(anon)' size=32 vlen=2 > >> >> > >> > '(anon)' type_id=26 bits_offset=0 > >> >> > >> > '(anon)' type_id=27 bits_offset=0 > >> >> > >> > [26] STRUCT '(anon)' size=8 vlen=2 > >> >> > >> > 'ipv4_src' type_id=21 bits_offset=0 > >> >> > >> > 'ipv4_dst' type_id=21 bits_offset=32 > >> >> > >> > [27] STRUCT '(anon)' size=32 vlen=2 > >> >> > >> > 'ipv6_src' type_id=28 bits_offset=0 > >> >> > >> > 'ipv6_dst' type_id=28 bits_offset=128 > >> >> > >> > [28] ARRAY '(anon)' type_id=12 index_type_id=16 nr_elems=4 > >> >> > >> > [29] PTR '(anon)' type_id=24 > >> >> > >> > [30] UNION '(anon)' size=8 vlen=1 > >> >> > >> > 'sk' type_id=32 bits_offset=0 > >> >> > >> > [31] STRUCT 'bpf_sock' size=80 vlen=14 > >> >> > >> > 'bound_dev_if' type_id=12 bits_offset=0 > >> >> > >> > 'family' type_id=12 bits_offset=32 > >> >> > >> > 'type' type_id=12 bits_offset=64 > >> >> > >> > 'protocol' type_id=12 bits_offset=96 > >> >> > >> > 'mark' type_id=12 bits_offset=128 > >> >> > >> > 'priority' type_id=12 bits_offset=160 > >> >> > >> > 'src_ip4' type_id=12 bits_offset=192 > >> >> > >> > 'src_ip6' type_id=28 bits_offset=224 > >> >> > >> > 'src_port' type_id=12 bits_offset=352 > >> >> > >> > 'dst_port' type_id=20 bits_offset=384 > >> >> > >> > 'dst_ip4' type_id=12 bits_offset=416 > >> >> > >> > 'dst_ip6' type_id=28 bits_offset=448 > >> >> > >> > 'state' type_id=12 bits_offset=576 > >> >> > >> > 'rx_queue_mapping' type_id=10 bits_offset=608 > >> >> > >> > [32] PTR '(anon)' type_id=31 > >> >> > >> > [33] STRUCT '__sk_buff' size=192 vlen=33 > >> >> > >> > 'len' type_id=12 bits_offset=0 > >> >> > >> > 'pkt_type' type_id=12 bits_offset=32 > >> >> > >> > 'mark' type_id=12 bits_offset=64 > >> >> > >> > 'queue_mapping' type_id=12 bits_offset=96 > >> >> > >> > 'protocol' type_id=12 bits_offset=128 > >> >> > >> > 'vlan_present' type_id=12 bits_offset=160 > >> >> > >> > 'vlan_tci' type_id=12 bits_offset=192 > >> >> > >> > 'vlan_proto' type_id=12 bits_offset=224 > >> >> > >> > 'priority' type_id=12 bits_offset=256 > >> >> > >> > 'ingress_ifindex' type_id=12 bits_offset=288 > >> >> > >> > 'ifindex' type_id=12 bits_offset=320 > >> >> > >> > 'tc_index' type_id=12 bits_offset=352 > >> >> > >> > 'cb' type_id=34 bits_offset=384 > >> >> > >> > 'hash' type_id=12 bits_offset=544 > >> >> > >> > 'tc_classid' type_id=12 bits_offset=576 > >> >> > >> > 'data' type_id=12 bits_offset=608 > >> >> > >> > 'data_end' type_id=12 bits_offset=640 > >> >> > >> > 'napi_id' type_id=12 bits_offset=672 > >> >> > >> > 'family' type_id=12 bits_offset=704 > >> >> > >> > 'remote_ip4' type_id=12 bits_offset=736 > >> >> > >> > 'local_ip4' type_id=12 bits_offset=768 > >> >> > >> > 'remote_ip6' type_id=28 bits_offset=800 > >> >> > >> > 'local_ip6' type_id=28 bits_offset=928 > >> >> > >> > 'remote_port' type_id=12 bits_offset=1056 > >> >> > >> > 'local_port' type_id=12 bits_offset=1088 > >> >> > >> > 'data_meta' type_id=12 bits_offset=1120 > >> >> > >> > '(anon)' type_id=23 bits_offset=1152 > >> >> > >> > 'tstamp' type_id=15 bits_offset=1216 > >> >> > >> > 'wire_len' type_id=12 bits_offset=1280 > >> >> > >> > 'gso_segs' type_id=12 bits_offset=1312 > >> >> > >> > '(anon)' type_id=30 bits_offset=1344 > >> >> > >> > 'gso_size' type_id=12 bits_offset=1408 > >> >> > >> > 'hwtstamp' type_id=15 bits_offset=1472 > >> >> > >> > [34] ARRAY '(anon)' type_id=12 index_type_id=16 nr_elems=5 > >> >> > >> > [35] CONST '(anon)' type_id=33 > >> >> > >> > [36] PTR '(anon)' type_id=0 > >> >> > >> > [37] STRUCT '(anon)' size=24 vlen=3 > >> >> > >> > 'type' type_id=39 bits_offset=0 > >> >> > >> > 'key' type_id=40 bits_offset=64 > >> >> > >> > 'value' type_id=41 bits_offset=128 > >> >> > >> > [38] ARRAY '(anon)' type_id=9 index_type_id=16 nr_elems=1 > >> >> > >> > [39] PTR '(anon)' type_id=38 > >> >> > >> > [40] PTR '(anon)' type_id=12 > >> >> > >> > [41] PTR '(anon)' type_id=3 > >> >> > >> > [42] ARRAY '(anon)' type_id=19 index_type_id=16 nr_elems=18 > >> >> > >> > [43] CONST '(anon)' type_id=42 > >> >> > >> > [44] FUNC_PROTO '(anon)' ret_type_id=36 vlen=2 > >> >> > >> > '(anon)' type_id=36 > >> >> > >> > '(anon)' type_id=46 > >> >> > >> > [45] CONST '(anon)' type_id=0 > >> >> > >> > [46] PTR '(anon)' type_id=45 > >> >> > >> > [47] FUNC_PROTO '(anon)' ret_type_id=9 vlen=1 > >> >> > >> > 'sk' type_id=48 > >> >> > >> > [48] PTR '(anon)' type_id=35 > >> >> > >> > [49] VAR '_license' type_id=43, linkage=static > >> >> > >> > [50] VAR 'is_allow_list' type_id=5, linkage=global > >> >> > >> > [51] VAR 'sd_restrictif' type_id=37, linkage=global > >> >> > >> > [52] FUNC 'sd_restrictif_i' type_id=47 linkage=global > >> >> > >> > [53] FUNC 'sd_restrictif_e' type_id=47 linkage=global > >> >> > >> > [54] FUNC 'restrict_network_interfaces_impl' type_id=47 linkage=static > >> >> > >> > [55] DATASEC '.data' size=1 vlen=1 > >> >> > >> > type_id=50 offset=0 size=1 (VAR 'is_allow_list') > >> >> > >> > [56] DATASEC 'license' size=18 vlen=1 > >> >> > >> > type_id=49 offset=0 size=18 (VAR '_license') > >> >> > >> > [57] DATASEC '.maps' size=24 vlen=1 > >> >> > >> > type_id=51 offset=0 size=24 (VAR 'sd_restrictif') > >> >> > >> > > >> >> > >> > File before being stripped using bpftool gen object: > >> >> > >> > /home/buildroot/buildroot/output/per-package/systemd/host/sbin/bpftool > >> >> > >> > btf dump file > >> >> > >> > > >> > > > output/build/systemd-custom/build/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.unstripped.o > >> >> > >> > format raw > >> >> > >> > [1] INT 'signed char' size=1 bits_offset=0 nr_bits=8 encoding=UNKN > >> >> > >> > [2] INT 'unsigned char' size=1 bits_offset=0 nr_bits=8 encoding=CHAR > >> >> > >> > [3] TYPEDEF '__u8' type_id=2 > >> >> > >> > [4] CONST '(anon)' type_id=3 > >> >> > >> > [5] VOLATILE '(anon)' type_id=4 > >> >> > >> > [6] INT 'short int' size=2 bits_offset=0 nr_bits=16 encoding=SIGNED > >> >> > >> > [7] INT 'short unsigned int' size=2 bits_offset=0 nr_bits=16 encoding=(none) > >> >> > >> > [8] TYPEDEF '__u16' type_id=7 > >> >> > >> > [9] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED > >> >> > >> > [10] TYPEDEF '__s32' type_id=9 > >> >> > >> > [11] INT 'unsigned int' size=4 bits_offset=0 nr_bits=32 encoding=(none) > >> >> > >> > [12] TYPEDEF '__u32' type_id=11 > >> >> > >> > [13] INT 'long long int' size=8 bits_offset=0 nr_bits=64 encoding=SIGNED > >> >> > >> > [14] INT 'long long unsigned int' size=8 bits_offset=0 nr_bits=64 > >> >> > >> > encoding=(none) > >> >> > >> > [15] TYPEDEF '__u64' type_id=14 > >> >> > >> > [16] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none) > >> >> > >> > [17] INT 'long int' size=8 bits_offset=0 nr_bits=64 encoding=SIGNED > >> >> > >> > [18] INT 'char' size=1 bits_offset=0 nr_bits=8 encoding=UNKN > >> >> > >> > [19] CONST '(anon)' type_id=18 > >> >> > >> > [20] TYPEDEF '__be16' type_id=8 > >> >> > >> > [21] TYPEDEF '__be32' type_id=12 > >> >> > >> > [22] ENUM 'bpf_map_type' encoding=UNSIGNED size=4 vlen=31 > >> >> > >> > 'BPF_MAP_TYPE_UNSPEC' val=0 > >> >> > >> > 'BPF_MAP_TYPE_HASH' val=1 > >> >> > >> > 'BPF_MAP_TYPE_ARRAY' val=2 > >> >> > >> > 'BPF_MAP_TYPE_PROG_ARRAY' val=3 > >> >> > >> > 'BPF_MAP_TYPE_PERF_EVENT_ARRAY' val=4 > >> >> > >> > 'BPF_MAP_TYPE_PERCPU_HASH' val=5 > >> >> > >> > 'BPF_MAP_TYPE_PERCPU_ARRAY' val=6 > >> >> > >> > 'BPF_MAP_TYPE_STACK_TRACE' val=7 > >> >> > >> > 'BPF_MAP_TYPE_CGROUP_ARRAY' val=8 > >> >> > >> > 'BPF_MAP_TYPE_LRU_HASH' val=9 > >> >> > >> > 'BPF_MAP_TYPE_LRU_PERCPU_HASH' val=10 > >> >> > >> > 'BPF_MAP_TYPE_LPM_TRIE' val=11 > >> >> > >> > 'BPF_MAP_TYPE_ARRAY_OF_MAPS' val=12 > >> >> > >> > 'BPF_MAP_TYPE_HASH_OF_MAPS' val=13 > >> >> > >> > 'BPF_MAP_TYPE_DEVMAP' val=14 > >> >> > >> > 'BPF_MAP_TYPE_SOCKMAP' val=15 > >> >> > >> > 'BPF_MAP_TYPE_CPUMAP' val=16 > >> >> > >> > 'BPF_MAP_TYPE_XSKMAP' val=17 > >> >> > >> > 'BPF_MAP_TYPE_SOCKHASH' val=18 > >> >> > >> > 'BPF_MAP_TYPE_CGROUP_STORAGE' val=19 > >> >> > >> > 'BPF_MAP_TYPE_REUSEPORT_SOCKARRAY' val=20 > >> >> > >> > 'BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE' val=21 > >> >> > >> > 'BPF_MAP_TYPE_QUEUE' val=22 > >> >> > >> > 'BPF_MAP_TYPE_STACK' val=23 > >> >> > >> > 'BPF_MAP_TYPE_SK_STORAGE' val=24 > >> >> > >> > 'BPF_MAP_TYPE_DEVMAP_HASH' val=25 > >> >> > >> > 'BPF_MAP_TYPE_STRUCT_OPS' val=26 > >> >> > >> > 'BPF_MAP_TYPE_RINGBUF' val=27 > >> >> > >> > 'BPF_MAP_TYPE_INODE_STORAGE' val=28 > >> >> > >> > 'BPF_MAP_TYPE_TASK_STORAGE' val=29 > >> >> > >> > 'BPF_MAP_TYPE_BLOOM_FILTER' val=30 > >> >> > >> > [23] UNION '(anon)' size=8 vlen=1 > >> >> > >> > 'flow_keys' type_id=29 bits_offset=0 > >> >> > >> > [24] STRUCT 'bpf_flow_keys' size=56 vlen=13 > >> >> > >> > 'nhoff' type_id=8 bits_offset=0 > >> >> > >> > 'thoff' type_id=8 bits_offset=16 > >> >> > >> > 'addr_proto' type_id=8 bits_offset=32 > >> >> > >> > 'is_frag' type_id=3 bits_offset=48 > >> >> > >> > 'is_first_frag' type_id=3 bits_offset=56 > >> >> > >> > 'is_encap' type_id=3 bits_offset=64 > >> >> > >> > 'ip_proto' type_id=3 bits_offset=72 > >> >> > >> > 'n_proto' type_id=20 bits_offset=80 > >> >> > >> > 'sport' type_id=20 bits_offset=96 > >> >> > >> > 'dport' type_id=20 bits_offset=112 > >> >> > >> > '(anon)' type_id=25 bits_offset=128 > >> >> > >> > 'flags' type_id=12 bits_offset=384 > >> >> > >> > 'flow_label' type_id=21 bits_offset=416 > >> >> > >> > [25] UNION '(anon)' size=32 vlen=2 > >> >> > >> > '(anon)' type_id=26 bits_offset=0 > >> >> > >> > '(anon)' type_id=27 bits_offset=0 > >> >> > >> > [26] STRUCT '(anon)' size=8 vlen=2 > >> >> > >> > 'ipv4_src' type_id=21 bits_offset=0 > >> >> > >> > 'ipv4_dst' type_id=21 bits_offset=32 > >> >> > >> > [27] STRUCT '(anon)' size=32 vlen=2 > >> >> > >> > 'ipv6_src' type_id=28 bits_offset=0 > >> >> > >> > 'ipv6_dst' type_id=28 bits_offset=128 > >> >> > >> > [28] ARRAY '(anon)' type_id=12 index_type_id=16 nr_elems=4 > >> >> > >> > [29] PTR '(anon)' type_id=24 > >> >> > >> > [30] UNION '(anon)' size=8 vlen=1 > >> >> > >> > 'sk' type_id=32 bits_offset=0 > >> >> > >> > [31] STRUCT 'bpf_sock' size=80 vlen=14 > >> >> > >> > 'bound_dev_if' type_id=12 bits_offset=0 > >> >> > >> > 'family' type_id=12 bits_offset=32 > >> >> > >> > 'type' type_id=12 bits_offset=64 > >> >> > >> > 'protocol' type_id=12 bits_offset=96 > >> >> > >> > 'mark' type_id=12 bits_offset=128 > >> >> > >> > 'priority' type_id=12 bits_offset=160 > >> >> > >> > 'src_ip4' type_id=12 bits_offset=192 > >> >> > >> > 'src_ip6' type_id=28 bits_offset=224 > >> >> > >> > 'src_port' type_id=12 bits_offset=352 > >> >> > >> > 'dst_port' type_id=20 bits_offset=384 > >> >> > >> > 'dst_ip4' type_id=12 bits_offset=416 > >> >> > >> > 'dst_ip6' type_id=28 bits_offset=448 > >> >> > >> > 'state' type_id=12 bits_offset=576 > >> >> > >> > 'rx_queue_mapping' type_id=10 bits_offset=608 > >> >> > >> > [32] PTR '(anon)' type_id=31 > >> >> > >> > [33] STRUCT '__sk_buff' size=192 vlen=33 > >> >> > >> > 'len' type_id=12 bits_offset=0 > >> >> > >> > 'pkt_type' type_id=12 bits_offset=32 > >> >> > >> > 'mark' type_id=12 bits_offset=64 > >> >> > >> > 'queue_mapping' type_id=12 bits_offset=96 > >> >> > >> > 'protocol' type_id=12 bits_offset=128 > >> >> > >> > 'vlan_present' type_id=12 bits_offset=160 > >> >> > >> > 'vlan_tci' type_id=12 bits_offset=192 > >> >> > >> > 'vlan_proto' type_id=12 bits_offset=224 > >> >> > >> > 'priority' type_id=12 bits_offset=256 > >> >> > >> > 'ingress_ifindex' type_id=12 bits_offset=288 > >> >> > >> > 'ifindex' type_id=12 bits_offset=320 > >> >> > >> > 'tc_index' type_id=12 bits_offset=352 > >> >> > >> > 'cb' type_id=34 bits_offset=384 > >> >> > >> > 'hash' type_id=12 bits_offset=544 > >> >> > >> > 'tc_classid' type_id=12 bits_offset=576 > >> >> > >> > 'data' type_id=12 bits_offset=608 > >> >> > >> > 'data_end' type_id=12 bits_offset=640 > >> >> > >> > 'napi_id' type_id=12 bits_offset=672 > >> >> > >> > 'family' type_id=12 bits_offset=704 > >> >> > >> > 'remote_ip4' type_id=12 bits_offset=736 > >> >> > >> > 'local_ip4' type_id=12 bits_offset=768 > >> >> > >> > 'remote_ip6' type_id=28 bits_offset=800 > >> >> > >> > 'local_ip6' type_id=28 bits_offset=928 > >> >> > >> > 'remote_port' type_id=12 bits_offset=1056 > >> >> > >> > 'local_port' type_id=12 bits_offset=1088 > >> >> > >> > 'data_meta' type_id=12 bits_offset=1120 > >> >> > >> > '(anon)' type_id=23 bits_offset=1152 > >> >> > >> > 'tstamp' type_id=15 bits_offset=1216 > >> >> > >> > 'wire_len' type_id=12 bits_offset=1280 > >> >> > >> > 'gso_segs' type_id=12 bits_offset=1312 > >> >> > >> > '(anon)' type_id=30 bits_offset=1344 > >> >> > >> > 'gso_size' type_id=12 bits_offset=1408 > >> >> > >> > 'hwtstamp' type_id=15 bits_offset=1472 > >> >> > >> > [34] ARRAY '(anon)' type_id=12 index_type_id=16 nr_elems=5 > >> >> > >> > [35] CONST '(anon)' type_id=33 > >> >> > >> > [36] PTR '(anon)' type_id=0 > >> >> > >> > [37] STRUCT '(anon)' size=24 vlen=3 > >> >> > >> > 'type' type_id=39 bits_offset=0 > >> >> > >> > 'key' type_id=40 bits_offset=64 > >> >> > >> > 'value' type_id=41 bits_offset=128 > >> >> > >> > [38] ARRAY '(anon)' type_id=9 index_type_id=16 nr_elems=1 > >> >> > >> > [39] PTR '(anon)' type_id=38 > >> >> > >> > [40] PTR '(anon)' type_id=12 > >> >> > >> > [41] PTR '(anon)' type_id=3 > >> >> > >> > [42] ARRAY '(anon)' type_id=19 index_type_id=16 nr_elems=18 > >> >> > >> > [43] CONST '(anon)' type_id=42 > >> >> > >> > [44] FUNC_PROTO '(anon)' ret_type_id=36 vlen=2 > >> >> > >> > '(anon)' type_id=36 > >> >> > >> > '(anon)' type_id=46 > >> >> > >> > [45] CONST '(anon)' type_id=0 > >> >> > >> > [46] PTR '(anon)' type_id=45 > >> >> > >> > [47] FUNC_PROTO '(anon)' ret_type_id=9 vlen=1 > >> >> > >> > 'sk' type_id=48 > >> >> > >> > [48] PTR '(anon)' type_id=35 > >> >> > >> > [49] FUNC_PROTO '(anon)' ret_type_id=9 vlen=1 > >> >> > >> > 'sk' type_id=48 > >> >> > >> > [50] FUNC_PROTO '(anon)' ret_type_id=9 vlen=1 > >> >> > >> > 'sk' type_id=48 > >> >> > >> > [51] VAR '_license' type_id=43, linkage=static > >> >> > >> > [52] VAR 'is_allow_list' type_id=5, linkage=global > >> >> > >> > [53] VAR 'sd_restrictif' type_id=37, linkage=global > >> >> > >> > [54] FUNC 'bpf_map_lookup_elem' type_id=44 linkage=global > >> >> > >> > [55] FUNC 'sd_restrictif_i' type_id=47 linkage=global > >> >> > >> > [56] FUNC 'sd_restrictif_e' type_id=49 linkage=global > >> >> > >> > [57] FUNC 'restrict_network_interfaces_impl' type_id=50 linkage=static > >> >> > >> > [58] DATASEC 'license' size=0 vlen=1 > >> >> > >> > type_id=51 offset=0 size=18 (VAR '_license') > >> >> > >> > [59] DATASEC '.maps' size=0 vlen=1 > >> >> > >> > type_id=53 offset=0 size=24 (VAR 'sd_restrictif') > >> >> > >> > [60] DATASEC '.data' size=0 vlen=1 > >> >> > >> > type_id=52 offset=0 size=1 (VAR 'is_allow_list') > >> >> > >> > > >> >> > >> >> > >> >> > >> >> >> GCC is wrong, clearly. This function is global ([0]) and libbpf > >> >> > >> >> >> expects it to be marked as such in BTF. > >> >> > >> >> >> > >> >> > >> >> >> > >> >> > >> > > >> > > > https://github.com/systemd/systemd/blob/main/src/core/bpf/restrict_ifaces/restrict-ifaces.bpf.c#L42-L50 > >> >> > >> >> >> > >> >> > >> >> >> > >> >> > >> >> >>> GCC: > >> >> > >> >> >>> > >> >> > >> >> >>> [1] INT 'signed char' size=1 bits_offset=0 nr_bits=8 encoding=UNKN > >> >> > >> >> >>> [2] INT 'unsigned char' size=1 bits_offset=0 nr_bits=8 encoding=CHAR > >> >> > >> >> >>> [3] TYPEDEF '__u8' type_id=2 > >> >> > >> >> >>> [4] CONST '(anon)' type_id=3 > >> >> > >> >> >> > >> >> > >> >> >> [...]
