179 lines · c
1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2// Copyright (C) 2018 Facebook3 4#include <stdlib.h>5#include <string.h>6#include <bpf/libbpf.h>7#include <linux/rtnetlink.h>8#include <linux/tc_act/tc_bpf.h>9 10#include "bpf/nlattr.h"11#include "main.h"12#include "netlink_dumper.h"13 14static void xdp_dump_prog_id(struct nlattr **tb, int attr,15 const char *mode,16 bool new_json_object)17{18 if (!tb[attr])19 return;20 21 if (new_json_object)22 NET_START_OBJECT23 NET_DUMP_STR("mode", " %s", mode);24 NET_DUMP_UINT("id", " id %u", libbpf_nla_getattr_u32(tb[attr]))25 if (new_json_object)26 NET_END_OBJECT27}28 29static int do_xdp_dump_one(struct nlattr *attr, unsigned int ifindex,30 const char *name)31{32 struct nlattr *tb[IFLA_XDP_MAX + 1];33 unsigned char mode;34 35 if (libbpf_nla_parse_nested(tb, IFLA_XDP_MAX, attr, NULL) < 0)36 return -1;37 38 if (!tb[IFLA_XDP_ATTACHED])39 return 0;40 41 mode = libbpf_nla_getattr_u8(tb[IFLA_XDP_ATTACHED]);42 if (mode == XDP_ATTACHED_NONE)43 return 0;44 45 NET_START_OBJECT;46 if (name)47 NET_DUMP_STR("devname", "%s", name);48 NET_DUMP_UINT("ifindex", "(%d)", ifindex);49 50 if (mode == XDP_ATTACHED_MULTI) {51 if (json_output) {52 jsonw_name(json_wtr, "multi_attachments");53 jsonw_start_array(json_wtr);54 }55 xdp_dump_prog_id(tb, IFLA_XDP_SKB_PROG_ID, "generic", true);56 xdp_dump_prog_id(tb, IFLA_XDP_DRV_PROG_ID, "driver", true);57 xdp_dump_prog_id(tb, IFLA_XDP_HW_PROG_ID, "offload", true);58 if (json_output)59 jsonw_end_array(json_wtr);60 } else if (mode == XDP_ATTACHED_DRV) {61 xdp_dump_prog_id(tb, IFLA_XDP_PROG_ID, "driver", false);62 } else if (mode == XDP_ATTACHED_SKB) {63 xdp_dump_prog_id(tb, IFLA_XDP_PROG_ID, "generic", false);64 } else if (mode == XDP_ATTACHED_HW) {65 xdp_dump_prog_id(tb, IFLA_XDP_PROG_ID, "offload", false);66 }67 68 NET_END_OBJECT_FINAL;69 return 0;70}71 72int do_xdp_dump(struct ifinfomsg *ifinfo, struct nlattr **tb)73{74 if (!tb[IFLA_XDP])75 return 0;76 77 return do_xdp_dump_one(tb[IFLA_XDP], ifinfo->ifi_index,78 libbpf_nla_getattr_str(tb[IFLA_IFNAME]));79}80 81static int do_bpf_dump_one_act(struct nlattr *attr)82{83 struct nlattr *tb[TCA_ACT_BPF_MAX + 1];84 85 if (libbpf_nla_parse_nested(tb, TCA_ACT_BPF_MAX, attr, NULL) < 0)86 return -LIBBPF_ERRNO__NLPARSE;87 88 if (!tb[TCA_ACT_BPF_PARMS])89 return -LIBBPF_ERRNO__NLPARSE;90 91 NET_START_OBJECT_NESTED2;92 if (tb[TCA_ACT_BPF_NAME])93 NET_DUMP_STR("name", "%s",94 libbpf_nla_getattr_str(tb[TCA_ACT_BPF_NAME]));95 if (tb[TCA_ACT_BPF_ID])96 NET_DUMP_UINT("id", " id %u",97 libbpf_nla_getattr_u32(tb[TCA_ACT_BPF_ID]));98 NET_END_OBJECT_NESTED;99 return 0;100}101 102static int do_dump_one_act(struct nlattr *attr)103{104 struct nlattr *tb[TCA_ACT_MAX + 1];105 106 if (!attr)107 return 0;108 109 if (libbpf_nla_parse_nested(tb, TCA_ACT_MAX, attr, NULL) < 0)110 return -LIBBPF_ERRNO__NLPARSE;111 112 if (tb[TCA_ACT_KIND] &&113 strcmp(libbpf_nla_data(tb[TCA_ACT_KIND]), "bpf") == 0)114 return do_bpf_dump_one_act(tb[TCA_ACT_OPTIONS]);115 116 return 0;117}118 119static int do_bpf_act_dump(struct nlattr *attr)120{121 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];122 int act, ret;123 124 if (libbpf_nla_parse_nested(tb, TCA_ACT_MAX_PRIO, attr, NULL) < 0)125 return -LIBBPF_ERRNO__NLPARSE;126 127 NET_START_ARRAY("act", " %s [");128 for (act = 0; act <= TCA_ACT_MAX_PRIO; act++) {129 ret = do_dump_one_act(tb[act]);130 if (ret)131 break;132 }133 NET_END_ARRAY("] ");134 135 return ret;136}137 138static int do_bpf_filter_dump(struct nlattr *attr)139{140 struct nlattr *tb[TCA_BPF_MAX + 1];141 int ret;142 143 if (libbpf_nla_parse_nested(tb, TCA_BPF_MAX, attr, NULL) < 0)144 return -LIBBPF_ERRNO__NLPARSE;145 146 if (tb[TCA_BPF_NAME])147 NET_DUMP_STR("name", " %s",148 libbpf_nla_getattr_str(tb[TCA_BPF_NAME]));149 if (tb[TCA_BPF_ID])150 NET_DUMP_UINT("id", " id %u",151 libbpf_nla_getattr_u32(tb[TCA_BPF_ID]));152 if (tb[TCA_BPF_ACT]) {153 ret = do_bpf_act_dump(tb[TCA_BPF_ACT]);154 if (ret)155 return ret;156 }157 158 return 0;159}160 161int do_filter_dump(struct tcmsg *info, struct nlattr **tb, const char *kind,162 const char *devname, int ifindex)163{164 int ret = 0;165 166 if (tb[TCA_OPTIONS] &&167 strcmp(libbpf_nla_data(tb[TCA_KIND]), "bpf") == 0) {168 NET_START_OBJECT;169 if (devname[0] != '\0')170 NET_DUMP_STR("devname", "%s", devname);171 NET_DUMP_UINT("ifindex", "(%u)", ifindex);172 NET_DUMP_STR("kind", " %s", kind);173 ret = do_bpf_filter_dump(tb[TCA_OPTIONS]);174 NET_END_OBJECT_FINAL;175 }176 177 return ret;178}179