diff options
Diffstat (limited to 'src/shared/bpf-dlopen.c')
| -rw-r--r-- | src/shared/bpf-dlopen.c | 106 |
1 files changed, 80 insertions, 26 deletions
diff --git a/src/shared/bpf-dlopen.c b/src/shared/bpf-dlopen.c index f00dbea..50491fc 100644 --- a/src/shared/bpf-dlopen.c +++ b/src/shared/bpf-dlopen.c @@ -18,26 +18,41 @@ #define MODERN_LIBBPF 0 #endif -struct bpf_link* (*sym_bpf_program__attach_cgroup)(const struct bpf_program *, int); -struct bpf_link* (*sym_bpf_program__attach_lsm)(const struct bpf_program *); -int (*sym_bpf_link__fd)(const struct bpf_link *); -int (*sym_bpf_link__destroy)(struct bpf_link *); -int (*sym_bpf_map__fd)(const struct bpf_map *); -const char* (*sym_bpf_map__name)(const struct bpf_map *); +DLSYM_FUNCTION(bpf_link__destroy); +DLSYM_FUNCTION(bpf_link__fd); +DLSYM_FUNCTION(bpf_link__open); +DLSYM_FUNCTION(bpf_link__pin); +DLSYM_FUNCTION(bpf_map__fd); +DLSYM_FUNCTION(bpf_map__name); +DLSYM_FUNCTION(bpf_map__set_inner_map_fd); +DLSYM_FUNCTION(bpf_map__set_max_entries); +DLSYM_FUNCTION(bpf_map__set_pin_path); +DLSYM_FUNCTION(bpf_map_delete_elem); +DLSYM_FUNCTION(bpf_map_get_fd_by_id); +DLSYM_FUNCTION(bpf_map_lookup_elem); +DLSYM_FUNCTION(bpf_map_update_elem); +DLSYM_FUNCTION(bpf_object__attach_skeleton); +DLSYM_FUNCTION(bpf_object__destroy_skeleton); +DLSYM_FUNCTION(bpf_object__detach_skeleton); +DLSYM_FUNCTION(bpf_object__load_skeleton); +DLSYM_FUNCTION(bpf_object__name); +DLSYM_FUNCTION(bpf_object__open_skeleton); +DLSYM_FUNCTION(bpf_object__pin_maps); +DLSYM_FUNCTION(bpf_program__attach); +DLSYM_FUNCTION(bpf_program__attach_cgroup); +DLSYM_FUNCTION(bpf_program__attach_lsm); +DLSYM_FUNCTION(bpf_program__name); +DLSYM_FUNCTION(libbpf_get_error); +DLSYM_FUNCTION(libbpf_set_print); +DLSYM_FUNCTION(ring_buffer__epoll_fd); +DLSYM_FUNCTION(ring_buffer__free); +DLSYM_FUNCTION(ring_buffer__new); +DLSYM_FUNCTION(ring_buffer__poll); + +/* new symbols available from libbpf 0.7.0 */ int (*sym_bpf_map_create)(enum bpf_map_type, const char *, __u32, __u32, __u32, const struct bpf_map_create_opts *); -int (*sym_bpf_map__set_max_entries)(struct bpf_map *, __u32); -int (*sym_bpf_map_update_elem)(int, const void *, const void *, __u64); -int (*sym_bpf_map_delete_elem)(int, const void *); -int (*sym_bpf_map__set_inner_map_fd)(struct bpf_map *, int); -int (*sym_bpf_object__open_skeleton)(struct bpf_object_skeleton *, const struct bpf_object_open_opts *); -int (*sym_bpf_object__load_skeleton)(struct bpf_object_skeleton *); -int (*sym_bpf_object__attach_skeleton)(struct bpf_object_skeleton *); -void (*sym_bpf_object__detach_skeleton)(struct bpf_object_skeleton *); -void (*sym_bpf_object__destroy_skeleton)(struct bpf_object_skeleton *); int (*sym_libbpf_probe_bpf_prog_type)(enum bpf_prog_type, const void *); -const char* (*sym_bpf_program__name)(const struct bpf_program *); -libbpf_print_fn_t (*sym_libbpf_set_print)(libbpf_print_fn_t); -long (*sym_libbpf_get_error)(const void *); +struct bpf_map* (*sym_bpf_object__next_map)(const struct bpf_object *obj, const struct bpf_map *map); /* compat symbols removed in libbpf 1.0 */ int (*sym_bpf_create_map)(enum bpf_map_type, int key_size, int value_size, int max_entries, __u32 map_flags); @@ -61,6 +76,11 @@ int dlopen_bpf(void) { void *dl; int r; + ELF_NOTE_DLOPEN("bpf", + "Support firewalling and sandboxing with BPF", + ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED, + "libbpf.so.1", "libbpf.so.0"); + DISABLE_WARNING_DEPRECATED_DECLARATIONS; dl = dlopen("libbpf.so.1", RTLD_LAZY); @@ -88,6 +108,8 @@ int dlopen_bpf(void) { DLSYM_ARG(bpf_probe_prog_type) #endif ); + + /* NB: we don't try to load bpf_object__next_map() on old versions */ } else { log_debug("Loaded 'libbpf.so.1' via dlopen()"); @@ -96,11 +118,13 @@ int dlopen_bpf(void) { dl, LOG_DEBUG, #if MODERN_LIBBPF DLSYM_ARG(bpf_map_create), - DLSYM_ARG(libbpf_probe_bpf_prog_type) + DLSYM_ARG(libbpf_probe_bpf_prog_type), + DLSYM_ARG(bpf_object__next_map) #else /* These symbols did not exist in old libbpf, hence we cannot type check them */ DLSYM_ARG_FORCE(bpf_map_create), - DLSYM_ARG_FORCE(libbpf_probe_bpf_prog_type) + DLSYM_ARG_FORCE(libbpf_probe_bpf_prog_type), + DLSYM_ARG_FORCE(bpf_object__next_map) #endif ); } @@ -111,28 +135,41 @@ int dlopen_bpf(void) { dl, LOG_DEBUG, DLSYM_ARG(bpf_link__destroy), DLSYM_ARG(bpf_link__fd), + DLSYM_ARG(bpf_link__open), + DLSYM_ARG(bpf_link__pin), DLSYM_ARG(bpf_map__fd), DLSYM_ARG(bpf_map__name), + DLSYM_ARG(bpf_map__set_inner_map_fd), DLSYM_ARG(bpf_map__set_max_entries), - DLSYM_ARG(bpf_map_update_elem), + DLSYM_ARG(bpf_map__set_pin_path), DLSYM_ARG(bpf_map_delete_elem), - DLSYM_ARG(bpf_map__set_inner_map_fd), - DLSYM_ARG(bpf_object__open_skeleton), - DLSYM_ARG(bpf_object__load_skeleton), + DLSYM_ARG(bpf_map_get_fd_by_id), + DLSYM_ARG(bpf_map_lookup_elem), + DLSYM_ARG(bpf_map_update_elem), DLSYM_ARG(bpf_object__attach_skeleton), - DLSYM_ARG(bpf_object__detach_skeleton), DLSYM_ARG(bpf_object__destroy_skeleton), + DLSYM_ARG(bpf_object__detach_skeleton), + DLSYM_ARG(bpf_object__load_skeleton), + DLSYM_ARG(bpf_object__name), + DLSYM_ARG(bpf_object__open_skeleton), + DLSYM_ARG(bpf_object__pin_maps), #if MODERN_LIBBPF + DLSYM_ARG(bpf_program__attach), DLSYM_ARG(bpf_program__attach_cgroup), DLSYM_ARG(bpf_program__attach_lsm), #else /* libbpf added a "const" to function parameters where it should not have, ignore this type incompatibility */ + DLSYM_ARG_FORCE(bpf_program__attach), DLSYM_ARG_FORCE(bpf_program__attach_cgroup), DLSYM_ARG_FORCE(bpf_program__attach_lsm), #endif DLSYM_ARG(bpf_program__name), + DLSYM_ARG(libbpf_get_error), DLSYM_ARG(libbpf_set_print), - DLSYM_ARG(libbpf_get_error)); + DLSYM_ARG(ring_buffer__epoll_fd), + DLSYM_ARG(ring_buffer__free), + DLSYM_ARG(ring_buffer__new), + DLSYM_ARG(ring_buffer__poll)); if (r < 0) return r; @@ -144,6 +181,23 @@ int dlopen_bpf(void) { return r; } +int bpf_get_error_translated(const void *ptr) { + int r; + + r = sym_libbpf_get_error(ptr); + + switch (r) { + case -524: + /* Workaround for kernel bug, BPF returns an internal error instead of translating it, until + * it is fixed: + * https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/errno.h?h=v6.9&id=a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6#n27 + */ + return -EOPNOTSUPP; + default: + return r; + } +} + #else int dlopen_bpf(void) { |