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bpf: dump id/jited info for cls/act programs

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Make use of TCA_BPF_ID/TCA_ACT_BPF_ID that we exposed and print the ID
of the programs loaded and use the new BPF_OBJ_GET_INFO_BY_FD command
for dumping further information about the program, currently whether
the attached program is jited.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Daniel Borkmann 2017-07-17 17:18:52 +02:00 committed by Stephen Hemminger
parent 612ff099a1
commit 779525cd77
4 changed files with 56 additions and 0 deletions
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2
include/bpf_util.h
View File

@ -261,6 +261,8 @@ int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns,
int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);
int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);
void bpf_dump_prog_info(FILE *f, uint32_t id);
#ifdef HAVE_ELF
int bpf_send_map_fds(const char *path, const char *obj);
int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,

48
lib/bpf.c
View File

@ -152,6 +152,54 @@ static int bpf_map_update(int fd, const void *key, const void *value,
return bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
}
static int bpf_prog_fd_by_id(uint32_t id)
{
union bpf_attr attr = {};
attr.prog_id = id;
return bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
}
static int bpf_prog_info_by_fd(int fd, struct bpf_prog_info *info,
uint32_t *info_len)
{
union bpf_attr attr = {};
int ret;
attr.info.bpf_fd = fd;
attr.info.info = bpf_ptr_to_u64(info);
attr.info.info_len = *info_len;
*info_len = 0;
ret = bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
if (!ret)
*info_len = attr.info.info_len;
return ret;
}
void bpf_dump_prog_info(FILE *f, uint32_t id)
{
struct bpf_prog_info info = {};
uint32_t len = sizeof(info);
int fd, ret;
fprintf(f, "id %u ", id);
fd = bpf_prog_fd_by_id(id);
if (fd < 0)
return;
ret = bpf_prog_info_by_fd(fd, &info, &len);
if (!ret && len) {
if (info.jited_prog_len)
fprintf(f, "jited ");
}
close(fd);
}
static int bpf_parse_string(char *arg, bool from_file, __u16 *bpf_len,
char **bpf_string, bool *need_release,
const char separator)

3
tc/f_bpf.c
View File

@ -230,6 +230,9 @@ static int bpf_print_opt(struct filter_util *qu, FILE *f,
b, sizeof(b)));
}
if (tb[TCA_BPF_ID])
bpf_dump_prog_info(f, rta_getattr_u32(tb[TCA_BPF_ID]));
if (tb[TCA_BPF_POLICE]) {
fprintf(f, "\n");
tc_print_police(f, tb[TCA_BPF_POLICE]);

3
tc/m_bpf.c
View File

@ -186,6 +186,9 @@ static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg)
b, sizeof(b)));
}
if (tb[TCA_ACT_BPF_ID])
bpf_dump_prog_info(f, rta_getattr_u32(tb[TCA_ACT_BPF_ID]));
print_action_control(f, "default-action ", parm->action, "\n");
fprintf(f, "\tindex %u ref %d bind %d", parm->index, parm->refcnt,
parm->bindcnt);