diff options
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/bpf.c | 44 | ||||
| -rw-r--r-- | tools/lib/bpf/bpf.h | 17 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 105 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.h | 8 |
4 files changed, 128 insertions, 46 deletions
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index e0500055f1a6..acbb3f8b3bec 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -146,26 +146,30 @@ int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, -1); } -int bpf_load_program_name(enum bpf_prog_type type, const char *name, - const struct bpf_insn *insns, - size_t insns_cnt, const char *license, - __u32 kern_version, char *log_buf, - size_t log_buf_sz) +int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, + char *log_buf, size_t log_buf_sz) { - int fd; union bpf_attr attr; - __u32 name_len = name ? strlen(name) : 0; + __u32 name_len; + int fd; + + if (!load_attr) + return -EINVAL; + + name_len = load_attr->name ? strlen(load_attr->name) : 0; bzero(&attr, sizeof(attr)); - attr.prog_type = type; - attr.insn_cnt = (__u32)insns_cnt; - attr.insns = ptr_to_u64(insns); - attr.license = ptr_to_u64(license); + attr.prog_type = load_attr->prog_type; + attr.expected_attach_type = load_attr->expected_attach_type; + attr.insn_cnt = (__u32)load_attr->insns_cnt; + attr.insns = ptr_to_u64(load_attr->insns); + attr.license = ptr_to_u64(load_attr->license); attr.log_buf = ptr_to_u64(NULL); attr.log_size = 0; attr.log_level = 0; - attr.kern_version = kern_version; - memcpy(attr.prog_name, name, min(name_len, BPF_OBJ_NAME_LEN - 1)); + attr.kern_version = load_attr->kern_version; + memcpy(attr.prog_name, load_attr->name, + min(name_len, BPF_OBJ_NAME_LEN - 1)); fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); if (fd >= 0 || !log_buf || !log_buf_sz) @@ -184,8 +188,18 @@ int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, __u32 kern_version, char *log_buf, size_t log_buf_sz) { - return bpf_load_program_name(type, NULL, insns, insns_cnt, license, - kern_version, log_buf, log_buf_sz); + struct bpf_load_program_attr load_attr; + + memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); + load_attr.prog_type = type; + load_attr.expected_attach_type = 0; + load_attr.name = NULL; + load_attr.insns = insns; + load_attr.insns_cnt = insns_cnt; + load_attr.license = license; + load_attr.kern_version = kern_version; + + return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); } int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index ee59342c6f42..39f6a0d64a3b 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -41,13 +41,20 @@ int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, int key_size, int inner_map_fd, int max_entries, __u32 map_flags); +struct bpf_load_program_attr { + enum bpf_prog_type prog_type; + enum bpf_attach_type expected_attach_type; + const char *name; + const struct bpf_insn *insns; + size_t insns_cnt; + const char *license; + __u32 kern_version; +}; + /* Recommend log buffer size */ #define BPF_LOG_BUF_SIZE (256 * 1024) -int bpf_load_program_name(enum bpf_prog_type type, const char *name, - const struct bpf_insn *insns, - size_t insns_cnt, const char *license, - __u32 kern_version, char *log_buf, - size_t log_buf_sz); +int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, + char *log_buf, size_t log_buf_sz); int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, size_t insns_cnt, const char *license, __u32 kern_version, char *log_buf, diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 64a8fc384186..48e3e743ebf7 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -203,6 +203,8 @@ struct bpf_program { struct bpf_object *obj; void *priv; bpf_program_clear_priv_t clear_priv; + + enum bpf_attach_type expected_attach_type; }; struct bpf_map { @@ -1162,21 +1164,31 @@ static int bpf_object__collect_reloc(struct bpf_object *obj) } static int -load_program(enum bpf_prog_type type, const char *name, struct bpf_insn *insns, - int insns_cnt, char *license, u32 kern_version, int *pfd) +load_program(enum bpf_prog_type type, enum bpf_attach_type expected_attach_type, + const char *name, struct bpf_insn *insns, int insns_cnt, + char *license, u32 kern_version, int *pfd) { - int ret; + struct bpf_load_program_attr load_attr; char *log_buf; + int ret; - if (!insns || !insns_cnt) + memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); + load_attr.prog_type = type; + load_attr.expected_attach_type = expected_attach_type; + load_attr.name = name; + load_attr.insns = insns; + load_attr.insns_cnt = insns_cnt; + load_attr.license = license; + load_attr.kern_version = kern_version; + + if (!load_attr.insns || !load_attr.insns_cnt) return -EINVAL; log_buf = malloc(BPF_LOG_BUF_SIZE); if (!log_buf) pr_warning("Alloc log buffer for bpf loader error, continue without log\n"); - ret = bpf_load_program_name(type, name, insns, insns_cnt, license, - kern_version, log_buf, BPF_LOG_BUF_SIZE); + ret = bpf_load_program_xattr(&load_attr, log_buf, BPF_LOG_BUF_SIZE); if (ret >= 0) { *pfd = ret; @@ -1192,18 +1204,18 @@ load_program(enum bpf_prog_type type, const char *name, struct bpf_insn *insns, pr_warning("-- BEGIN DUMP LOG ---\n"); pr_warning("\n%s\n", log_buf); pr_warning("-- END LOG --\n"); - } else if (insns_cnt >= BPF_MAXINSNS) { - pr_warning("Program too large (%d insns), at most %d insns\n", - insns_cnt, BPF_MAXINSNS); + } else if (load_attr.insns_cnt >= BPF_MAXINSNS) { + pr_warning("Program too large (%zu insns), at most %d insns\n", + load_attr.insns_cnt, BPF_MAXINSNS); ret = -LIBBPF_ERRNO__PROG2BIG; } else { /* Wrong program type? */ - if (type != BPF_PROG_TYPE_KPROBE) { + if (load_attr.prog_type != BPF_PROG_TYPE_KPROBE) { int fd; - fd = bpf_load_program_name(BPF_PROG_TYPE_KPROBE, name, - insns, insns_cnt, license, - kern_version, NULL, 0); + load_attr.prog_type = BPF_PROG_TYPE_KPROBE; + load_attr.expected_attach_type = 0; + fd = bpf_load_program_xattr(&load_attr, NULL, 0); if (fd >= 0) { close(fd); ret = -LIBBPF_ERRNO__PROGTYPE; @@ -1247,8 +1259,9 @@ bpf_program__load(struct bpf_program *prog, pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n", prog->section_name, prog->instances.nr); } - err = load_program(prog->type, prog->name, prog->insns, - prog->insns_cnt, license, kern_version, &fd); + err = load_program(prog->type, prog->expected_attach_type, + prog->name, prog->insns, prog->insns_cnt, + license, kern_version, &fd); if (!err) prog->instances.fds[0] = fd; goto out; @@ -1276,8 +1289,8 @@ bpf_program__load(struct bpf_program *prog, continue; } - err = load_program(prog->type, prog->name, - result.new_insn_ptr, + err = load_program(prog->type, prog->expected_attach_type, + prog->name, result.new_insn_ptr, result.new_insn_cnt, license, kern_version, &fd); @@ -1835,11 +1848,22 @@ BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT); BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP); BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT); -#define BPF_PROG_SEC(string, type) { string, sizeof(string) - 1, type } +static void bpf_program__set_expected_attach_type(struct bpf_program *prog, + enum bpf_attach_type type) +{ + prog->expected_attach_type = type; +} + +#define BPF_PROG_SEC_FULL(string, ptype, atype) \ + { string, sizeof(string) - 1, ptype, atype } + +#define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_FULL(string, ptype, 0) + static const struct { const char *sec; size_t len; enum bpf_prog_type prog_type; + enum bpf_attach_type expected_attach_type; } section_names[] = { BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER), BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE), @@ -1859,9 +1883,11 @@ static const struct { BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB), BPF_PROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG), }; + #undef BPF_PROG_SEC +#undef BPF_PROG_SEC_FULL -static enum bpf_prog_type bpf_program__guess_type(struct bpf_program *prog) +static int bpf_program__identify_section(struct bpf_program *prog) { int i; @@ -1871,13 +1897,13 @@ static enum bpf_prog_type bpf_program__guess_type(struct bpf_program *prog) for (i = 0; i < ARRAY_SIZE(section_names); i++) if (strncmp(prog->section_name, section_names[i].sec, section_names[i].len) == 0) - return section_names[i].prog_type; + return i; err: pr_warning("failed to guess program type based on section name %s\n", prog->section_name); - return BPF_PROG_TYPE_UNSPEC; + return -1; } int bpf_map__fd(struct bpf_map *map) @@ -1977,11 +2003,30 @@ long libbpf_get_error(const void *ptr) int bpf_prog_load(const char *file, enum bpf_prog_type type, struct bpf_object **pobj, int *prog_fd) { + struct bpf_prog_load_attr attr; + + memset(&attr, 0, sizeof(struct bpf_prog_load_attr)); + attr.file = file; + attr.prog_type = type; + attr.expected_attach_type = 0; + + return bpf_prog_load_xattr(&attr, pobj, prog_fd); +} + +int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, + struct bpf_object **pobj, int *prog_fd) +{ struct bpf_program *prog, *first_prog = NULL; + enum bpf_attach_type expected_attach_type; + enum bpf_prog_type prog_type; struct bpf_object *obj; + int section_idx; int err; - obj = bpf_object__open(file); + if (!attr) + return -EINVAL; + + obj = bpf_object__open(attr->file); if (IS_ERR(obj)) return -ENOENT; @@ -1990,15 +2035,23 @@ int bpf_prog_load(const char *file, enum bpf_prog_type type, * If type is not specified, try to guess it based on * section name. */ - if (type == BPF_PROG_TYPE_UNSPEC) { - type = bpf_program__guess_type(prog); - if (type == BPF_PROG_TYPE_UNSPEC) { + prog_type = attr->prog_type; + expected_attach_type = attr->expected_attach_type; + if (prog_type == BPF_PROG_TYPE_UNSPEC) { + section_idx = bpf_program__identify_section(prog); + if (section_idx < 0) { bpf_object__close(obj); return -EINVAL; } + prog_type = section_names[section_idx].prog_type; + expected_attach_type = + section_names[section_idx].expected_attach_type; } - bpf_program__set_type(prog, type); + bpf_program__set_type(prog, prog_type); + bpf_program__set_expected_attach_type(prog, + expected_attach_type); + if (prog->idx != obj->efile.text_shndx && !first_prog) first_prog = prog; } diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index f85906533cdd..a3a62a583f27 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -248,6 +248,14 @@ int bpf_map__pin(struct bpf_map *map, const char *path); long libbpf_get_error(const void *ptr); +struct bpf_prog_load_attr { + const char *file; + enum bpf_prog_type prog_type; + enum bpf_attach_type expected_attach_type; +}; + +int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, + struct bpf_object **pobj, int *prog_fd); int bpf_prog_load(const char *file, enum bpf_prog_type type, struct bpf_object **pobj, int *prog_fd); 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