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bpf: consolidate dumps to use bpf_dump_prog_info

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Consolidate dump of prog info to use bpf_dump_prog_info() when possible.
Moving forward, we want to have a consistent output for BPF progs when
being dumped. E.g. in cls/act case we used to dump tag as a separate
netlink attribute before we had BPF_OBJ_GET_INFO_BY_FD bpf(2) command.

Move dumping tag into bpf_dump_prog_info() as well, and only dump the
netlink attribute for older kernels. Also, reuse bpf_dump_prog_info()
for XDP case, so we can dump tag and whether program was jited, which
we currently don't show.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Daniel Borkmann 2017-09-05 02:24:32 +02:00 committed by Stephen Hemminger
parent 1b736dc469
commit a0b5b7cf5c
7 changed files with 38 additions and 19 deletions
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2
include/bpf_util.h
View File

@ -261,7 +261,7 @@ 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);
int bpf_dump_prog_info(FILE *f, uint32_t id);
#ifdef HAVE_ELF
int bpf_send_map_fds(const char *path, const char *obj);

6
ip/ipaddress.c
View File

@ -837,7 +837,7 @@ int print_linkinfo(const struct sockaddr_nl *who,
if (tb[IFLA_MTU])
fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
if (tb[IFLA_XDP])
xdp_dump(fp, tb[IFLA_XDP]);
xdp_dump(fp, tb[IFLA_XDP], do_link, false);
if (tb[IFLA_QDISC])
fprintf(fp, "qdisc %s ", rta_getattr_str(tb[IFLA_QDISC]));
if (tb[IFLA_MASTER]) {
@ -951,12 +951,14 @@ int print_linkinfo(const struct sockaddr_nl *who,
}
}
if ((do_link || show_details) && tb[IFLA_IFALIAS]) {
fprintf(fp, "%s alias %s", _SL_,
rta_getattr_str(tb[IFLA_IFALIAS]));
}
if ((do_link || show_details) && tb[IFLA_XDP])
xdp_dump(fp, tb[IFLA_XDP], true, true);
if (do_link && show_stats) {
fprintf(fp, "%s", _SL_);
__print_link_stats(fp, tb);

19
ip/iplink_xdp.c
View File

@ -81,9 +81,10 @@ int xdp_parse(int *argc, char ***argv, struct iplink_req *req, bool generic,
return 0;
}
void xdp_dump(FILE *fp, struct rtattr *xdp)
void xdp_dump(FILE *fp, struct rtattr *xdp, bool link, bool details)
{
struct rtattr *tb[IFLA_XDP_MAX + 1];
__u32 prog_id = 0;
__u8 mode;
parse_rtattr_nested(tb, IFLA_XDP_MAX, xdp);
@ -94,6 +95,8 @@ void xdp_dump(FILE *fp, struct rtattr *xdp)
mode = rta_getattr_u8(tb[IFLA_XDP_ATTACHED]);
if (mode == XDP_ATTACHED_NONE)
return;
else if (details && link)
fprintf(fp, "%s prog/xdp", _SL_);
else if (mode == XDP_ATTACHED_DRV)
fprintf(fp, "xdp");
else if (mode == XDP_ATTACHED_SKB)
@ -104,8 +107,16 @@ void xdp_dump(FILE *fp, struct rtattr *xdp)
fprintf(fp, "xdp[%u]", mode);
if (tb[IFLA_XDP_PROG_ID])
fprintf(fp, "/id:%u",
rta_getattr_u32(tb[IFLA_XDP_PROG_ID]));
prog_id = rta_getattr_u32(tb[IFLA_XDP_PROG_ID]);
if (!details) {
if (prog_id && !link)
fprintf(fp, "/id:%u", prog_id);
fprintf(fp, " ");
return;
}
fprintf(fp, " ");
if (prog_id) {
fprintf(fp, " ");
bpf_dump_prog_info(fp, prog_id);
}
}

2
ip/xdp.h
View File

@ -5,6 +5,6 @@
int xdp_parse(int *argc, char ***argv, struct iplink_req *req, bool generic,
bool drv, bool offload);
void xdp_dump(FILE *fp, struct rtattr *tb);
void xdp_dump(FILE *fp, struct rtattr *tb, bool link, bool details);
#endif /* __XDP__ */

12
lib/bpf.c
View File

@ -179,25 +179,31 @@ static int bpf_prog_info_by_fd(int fd, struct bpf_prog_info *info,
return ret;
}
void bpf_dump_prog_info(FILE *f, uint32_t id)
int bpf_dump_prog_info(FILE *f, uint32_t id)
{
struct bpf_prog_info info = {};
uint32_t len = sizeof(info);
int fd, ret;
int fd, ret, dump_ok = 0;
SPRINT_BUF(tmp);
fprintf(f, "id %u ", id);
fd = bpf_prog_fd_by_id(id);
if (fd < 0)
return;
return dump_ok;
ret = bpf_prog_info_by_fd(fd, &info, &len);
if (!ret && len) {
fprintf(f, "tag %s ",
hexstring_n2a(info.tag, sizeof(info.tag),
tmp, sizeof(tmp)));
if (info.jited_prog_len)
fprintf(f, "jited ");
dump_ok = 1;
}
close(fd);
return dump_ok;
}
static int bpf_parse_string(char *arg, bool from_file, __u16 *bpf_len,

8
tc/f_bpf.c
View File

@ -177,6 +177,7 @@ static int bpf_print_opt(struct filter_util *qu, FILE *f,
struct rtattr *opt, __u32 handle)
{
struct rtattr *tb[TCA_BPF_MAX + 1];
int dump_ok = 0;
if (opt == NULL)
return 0;
@ -221,7 +222,9 @@ static int bpf_print_opt(struct filter_util *qu, FILE *f,
bpf_print_ops(f, tb[TCA_BPF_OPS],
rta_getattr_u16(tb[TCA_BPF_OPS_LEN]));
if (tb[TCA_BPF_TAG]) {
if (tb[TCA_BPF_ID])
dump_ok = bpf_dump_prog_info(f, rta_getattr_u32(tb[TCA_BPF_ID]));
if (!dump_ok && tb[TCA_BPF_TAG]) {
SPRINT_BUF(b);
fprintf(f, "tag %s ",
@ -230,9 +233,6 @@ 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]);

8
tc/m_bpf.c
View File

@ -154,6 +154,7 @@ static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg)
{
struct rtattr *tb[TCA_ACT_BPF_MAX + 1];
struct tc_act_bpf *parm;
int dump_ok = 0;
if (arg == NULL)
return -1;
@ -177,7 +178,9 @@ static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg)
fprintf(f, " ");
}
if (tb[TCA_ACT_BPF_TAG]) {
if (tb[TCA_ACT_BPF_ID])
dump_ok = bpf_dump_prog_info(f, rta_getattr_u32(tb[TCA_ACT_BPF_ID]));
if (!dump_ok && tb[TCA_ACT_BPF_TAG]) {
SPRINT_BUF(b);
fprintf(f, "tag %s ",
@ -186,9 +189,6 @@ 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);