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// SPDX-License-Identifier: GPL-2.0+
// Copyright (C) 2018 Facebook
#include <stdlib.h>
#include <string.h>
#include <libbpf.h>
#include <linux/rtnetlink.h>
#include <linux/tc_act/tc_bpf.h>
#include <nlattr.h>
#include "main.h"
#include "netlink_dumper.h"
static void xdp_dump_prog_id(struct nlattr **tb, int attr,
const char *type)
{
if (!tb[attr])
return;
NET_DUMP_UINT(type, nla_getattr_u32(tb[attr]))
}
static int do_xdp_dump_one(struct nlattr *attr, unsigned int ifindex,
const char *name)
{
struct nlattr *tb[IFLA_XDP_MAX + 1];
unsigned char mode;
if (nla_parse_nested(tb, IFLA_XDP_MAX, attr, NULL) < 0)
return -1;
if (!tb[IFLA_XDP_ATTACHED])
return 0;
mode = nla_getattr_u8(tb[IFLA_XDP_ATTACHED]);
if (mode == XDP_ATTACHED_NONE)
return 0;
NET_START_OBJECT;
NET_DUMP_UINT("ifindex", ifindex);
if (name)
NET_DUMP_STR("devname", name);
if (tb[IFLA_XDP_PROG_ID])
NET_DUMP_UINT("prog_id", nla_getattr_u32(tb[IFLA_XDP_PROG_ID]));
if (mode == XDP_ATTACHED_MULTI) {
xdp_dump_prog_id(tb, IFLA_XDP_SKB_PROG_ID, "generic_prog_id");
xdp_dump_prog_id(tb, IFLA_XDP_DRV_PROG_ID, "drv_prog_id");
xdp_dump_prog_id(tb, IFLA_XDP_HW_PROG_ID, "offload_prog_id");
}
NET_END_OBJECT_FINAL;
return 0;
}
int do_xdp_dump(struct ifinfomsg *ifinfo, struct nlattr **tb)
{
if (!tb[IFLA_XDP])
return 0;
return do_xdp_dump_one(tb[IFLA_XDP], ifinfo->ifi_index,
nla_getattr_str(tb[IFLA_IFNAME]));
}
static char *hexstring_n2a(const unsigned char *str, int len,
char *buf, int blen)
{
char *ptr = buf;
int i;
for (i = 0; i < len; i++) {
if (blen < 3)
break;
sprintf(ptr, "%02x", str[i]);
ptr += 2;
blen -= 2;
}
return buf;
}
static int do_bpf_dump_one_act(struct nlattr *attr)
{
struct nlattr *tb[TCA_ACT_BPF_MAX + 1];
char buf[256];
if (nla_parse_nested(tb, TCA_ACT_BPF_MAX, attr, NULL) < 0)
return -LIBBPF_ERRNO__NLPARSE;
if (!tb[TCA_ACT_BPF_PARMS])
return -LIBBPF_ERRNO__NLPARSE;
NET_START_OBJECT_NESTED2;
if (tb[TCA_ACT_BPF_NAME])
NET_DUMP_STR("name", nla_getattr_str(tb[TCA_ACT_BPF_NAME]));
if (tb[TCA_ACT_BPF_ID])
NET_DUMP_UINT("bpf_id", nla_getattr_u32(tb[TCA_ACT_BPF_ID]));
if (tb[TCA_ACT_BPF_TAG])
NET_DUMP_STR("tag", hexstring_n2a(nla_data(tb[TCA_ACT_BPF_TAG]),
nla_len(tb[TCA_ACT_BPF_TAG]),
buf, sizeof(buf)));
NET_END_OBJECT_NESTED;
return 0;
}
static int do_dump_one_act(struct nlattr *attr)
{
struct nlattr *tb[TCA_ACT_MAX + 1];
if (!attr)
return 0;
if (nla_parse_nested(tb, TCA_ACT_MAX, attr, NULL) < 0)
return -LIBBPF_ERRNO__NLPARSE;
if (tb[TCA_ACT_KIND] && strcmp(nla_data(tb[TCA_ACT_KIND]), "bpf") == 0)
return do_bpf_dump_one_act(tb[TCA_ACT_OPTIONS]);
return 0;
}
static int do_bpf_act_dump(struct nlattr *attr)
{
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
int act, ret;
if (nla_parse_nested(tb, TCA_ACT_MAX_PRIO, attr, NULL) < 0)
return -LIBBPF_ERRNO__NLPARSE;
NET_START_ARRAY("act", "");
for (act = 0; act <= TCA_ACT_MAX_PRIO; act++) {
ret = do_dump_one_act(tb[act]);
if (ret)
break;
}
NET_END_ARRAY(" ");
return ret;
}
static int do_bpf_filter_dump(struct nlattr *attr)
{
struct nlattr *tb[TCA_BPF_MAX + 1];
char buf[256];
int ret;
if (nla_parse_nested(tb, TCA_BPF_MAX, attr, NULL) < 0)
return -LIBBPF_ERRNO__NLPARSE;
if (tb[TCA_BPF_NAME])
NET_DUMP_STR("name", nla_getattr_str(tb[TCA_BPF_NAME]));
if (tb[TCA_BPF_ID])
NET_DUMP_UINT("prog_id", nla_getattr_u32(tb[TCA_BPF_ID]));
if (tb[TCA_BPF_TAG])
NET_DUMP_STR("tag", hexstring_n2a(nla_data(tb[TCA_BPF_TAG]),
nla_len(tb[TCA_BPF_TAG]),
buf, sizeof(buf)));
if (tb[TCA_BPF_ACT]) {
ret = do_bpf_act_dump(tb[TCA_BPF_ACT]);
if (ret)
return ret;
}
return 0;
}
int do_filter_dump(struct tcmsg *info, struct nlattr **tb, const char *kind)
{
int ret = 0;
if (tb[TCA_OPTIONS] && strcmp(nla_data(tb[TCA_KIND]), "bpf") == 0) {
NET_START_OBJECT;
NET_DUMP_UINT("ifindex", info->tcm_ifindex);
NET_DUMP_STR("kind", kind);
ret = do_bpf_filter_dump(tb[TCA_OPTIONS]);
NET_END_OBJECT_FINAL;
}
return ret;
}
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