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0001 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
0002 // Copyright (C) 2018 Facebook
0003 
0004 #define _GNU_SOURCE
0005 #include <errno.h>
0006 #include <fcntl.h>
0007 #include <stdlib.h>
0008 #include <string.h>
0009 #include <time.h>
0010 #include <unistd.h>
0011 #include <bpf/bpf.h>
0012 #include <bpf/libbpf.h>
0013 #include <net/if.h>
0014 #include <linux/rtnetlink.h>
0015 #include <linux/socket.h>
0016 #include <linux/tc_act/tc_bpf.h>
0017 #include <sys/socket.h>
0018 #include <sys/stat.h>
0019 #include <sys/types.h>
0020 
0021 #include "bpf/nlattr.h"
0022 #include "main.h"
0023 #include "netlink_dumper.h"
0024 
0025 #ifndef SOL_NETLINK
0026 #define SOL_NETLINK 270
0027 #endif
0028 
0029 struct ip_devname_ifindex {
0030     char    devname[64];
0031     int ifindex;
0032 };
0033 
0034 struct bpf_netdev_t {
0035     struct ip_devname_ifindex *devices;
0036     int used_len;
0037     int array_len;
0038     int filter_idx;
0039 };
0040 
0041 struct tc_kind_handle {
0042     char    kind[64];
0043     int handle;
0044 };
0045 
0046 struct bpf_tcinfo_t {
0047     struct tc_kind_handle   *handle_array;
0048     int         used_len;
0049     int         array_len;
0050     bool            is_qdisc;
0051 };
0052 
0053 struct bpf_filter_t {
0054     const char  *kind;
0055     const char  *devname;
0056     int     ifindex;
0057 };
0058 
0059 struct bpf_attach_info {
0060     __u32 flow_dissector_id;
0061 };
0062 
0063 enum net_attach_type {
0064     NET_ATTACH_TYPE_XDP,
0065     NET_ATTACH_TYPE_XDP_GENERIC,
0066     NET_ATTACH_TYPE_XDP_DRIVER,
0067     NET_ATTACH_TYPE_XDP_OFFLOAD,
0068 };
0069 
0070 static const char * const attach_type_strings[] = {
0071     [NET_ATTACH_TYPE_XDP]       = "xdp",
0072     [NET_ATTACH_TYPE_XDP_GENERIC]   = "xdpgeneric",
0073     [NET_ATTACH_TYPE_XDP_DRIVER]    = "xdpdrv",
0074     [NET_ATTACH_TYPE_XDP_OFFLOAD]   = "xdpoffload",
0075 };
0076 
0077 const size_t net_attach_type_size = ARRAY_SIZE(attach_type_strings);
0078 
0079 static enum net_attach_type parse_attach_type(const char *str)
0080 {
0081     enum net_attach_type type;
0082 
0083     for (type = 0; type < net_attach_type_size; type++) {
0084         if (attach_type_strings[type] &&
0085             is_prefix(str, attach_type_strings[type]))
0086             return type;
0087     }
0088 
0089     return net_attach_type_size;
0090 }
0091 
0092 typedef int (*dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
0093 
0094 typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, dump_nlmsg_t, void *cookie);
0095 
0096 static int netlink_open(__u32 *nl_pid)
0097 {
0098     struct sockaddr_nl sa;
0099     socklen_t addrlen;
0100     int one = 1, ret;
0101     int sock;
0102 
0103     memset(&sa, 0, sizeof(sa));
0104     sa.nl_family = AF_NETLINK;
0105 
0106     sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
0107     if (sock < 0)
0108         return -errno;
0109 
0110     if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK,
0111                &one, sizeof(one)) < 0) {
0112         p_err("Netlink error reporting not supported");
0113     }
0114 
0115     if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
0116         ret = -errno;
0117         goto cleanup;
0118     }
0119 
0120     addrlen = sizeof(sa);
0121     if (getsockname(sock, (struct sockaddr *)&sa, &addrlen) < 0) {
0122         ret = -errno;
0123         goto cleanup;
0124     }
0125 
0126     if (addrlen != sizeof(sa)) {
0127         ret = -LIBBPF_ERRNO__INTERNAL;
0128         goto cleanup;
0129     }
0130 
0131     *nl_pid = sa.nl_pid;
0132     return sock;
0133 
0134 cleanup:
0135     close(sock);
0136     return ret;
0137 }
0138 
0139 static int netlink_recv(int sock, __u32 nl_pid, __u32 seq,
0140                 __dump_nlmsg_t _fn, dump_nlmsg_t fn,
0141                 void *cookie)
0142 {
0143     bool multipart = true;
0144     struct nlmsgerr *err;
0145     struct nlmsghdr *nh;
0146     char buf[4096];
0147     int len, ret;
0148 
0149     while (multipart) {
0150         multipart = false;
0151         len = recv(sock, buf, sizeof(buf), 0);
0152         if (len < 0) {
0153             ret = -errno;
0154             goto done;
0155         }
0156 
0157         if (len == 0)
0158             break;
0159 
0160         for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, (unsigned int)len);
0161              nh = NLMSG_NEXT(nh, len)) {
0162             if (nh->nlmsg_pid != nl_pid) {
0163                 ret = -LIBBPF_ERRNO__WRNGPID;
0164                 goto done;
0165             }
0166             if (nh->nlmsg_seq != seq) {
0167                 ret = -LIBBPF_ERRNO__INVSEQ;
0168                 goto done;
0169             }
0170             if (nh->nlmsg_flags & NLM_F_MULTI)
0171                 multipart = true;
0172             switch (nh->nlmsg_type) {
0173             case NLMSG_ERROR:
0174                 err = (struct nlmsgerr *)NLMSG_DATA(nh);
0175                 if (!err->error)
0176                     continue;
0177                 ret = err->error;
0178                 libbpf_nla_dump_errormsg(nh);
0179                 goto done;
0180             case NLMSG_DONE:
0181                 return 0;
0182             default:
0183                 break;
0184             }
0185             if (_fn) {
0186                 ret = _fn(nh, fn, cookie);
0187                 if (ret)
0188                     return ret;
0189             }
0190         }
0191     }
0192     ret = 0;
0193 done:
0194     return ret;
0195 }
0196 
0197 static int __dump_class_nlmsg(struct nlmsghdr *nlh,
0198                   dump_nlmsg_t dump_class_nlmsg,
0199                   void *cookie)
0200 {
0201     struct nlattr *tb[TCA_MAX + 1], *attr;
0202     struct tcmsg *t = NLMSG_DATA(nlh);
0203     int len;
0204 
0205     len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
0206     attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
0207     if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
0208         return -LIBBPF_ERRNO__NLPARSE;
0209 
0210     return dump_class_nlmsg(cookie, t, tb);
0211 }
0212 
0213 static int netlink_get_class(int sock, unsigned int nl_pid, int ifindex,
0214                  dump_nlmsg_t dump_class_nlmsg, void *cookie)
0215 {
0216     struct {
0217         struct nlmsghdr nlh;
0218         struct tcmsg t;
0219     } req = {
0220         .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
0221         .nlh.nlmsg_type = RTM_GETTCLASS,
0222         .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
0223         .t.tcm_family = AF_UNSPEC,
0224         .t.tcm_ifindex = ifindex,
0225     };
0226     int seq = time(NULL);
0227 
0228     req.nlh.nlmsg_seq = seq;
0229     if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
0230         return -errno;
0231 
0232     return netlink_recv(sock, nl_pid, seq, __dump_class_nlmsg,
0233                 dump_class_nlmsg, cookie);
0234 }
0235 
0236 static int __dump_qdisc_nlmsg(struct nlmsghdr *nlh,
0237                   dump_nlmsg_t dump_qdisc_nlmsg,
0238                   void *cookie)
0239 {
0240     struct nlattr *tb[TCA_MAX + 1], *attr;
0241     struct tcmsg *t = NLMSG_DATA(nlh);
0242     int len;
0243 
0244     len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
0245     attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
0246     if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
0247         return -LIBBPF_ERRNO__NLPARSE;
0248 
0249     return dump_qdisc_nlmsg(cookie, t, tb);
0250 }
0251 
0252 static int netlink_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
0253                  dump_nlmsg_t dump_qdisc_nlmsg, void *cookie)
0254 {
0255     struct {
0256         struct nlmsghdr nlh;
0257         struct tcmsg t;
0258     } req = {
0259         .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
0260         .nlh.nlmsg_type = RTM_GETQDISC,
0261         .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
0262         .t.tcm_family = AF_UNSPEC,
0263         .t.tcm_ifindex = ifindex,
0264     };
0265     int seq = time(NULL);
0266 
0267     req.nlh.nlmsg_seq = seq;
0268     if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
0269         return -errno;
0270 
0271     return netlink_recv(sock, nl_pid, seq, __dump_qdisc_nlmsg,
0272                 dump_qdisc_nlmsg, cookie);
0273 }
0274 
0275 static int __dump_filter_nlmsg(struct nlmsghdr *nlh,
0276                    dump_nlmsg_t dump_filter_nlmsg,
0277                    void *cookie)
0278 {
0279     struct nlattr *tb[TCA_MAX + 1], *attr;
0280     struct tcmsg *t = NLMSG_DATA(nlh);
0281     int len;
0282 
0283     len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
0284     attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
0285     if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
0286         return -LIBBPF_ERRNO__NLPARSE;
0287 
0288     return dump_filter_nlmsg(cookie, t, tb);
0289 }
0290 
0291 static int netlink_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
0292                   dump_nlmsg_t dump_filter_nlmsg, void *cookie)
0293 {
0294     struct {
0295         struct nlmsghdr nlh;
0296         struct tcmsg t;
0297     } req = {
0298         .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
0299         .nlh.nlmsg_type = RTM_GETTFILTER,
0300         .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
0301         .t.tcm_family = AF_UNSPEC,
0302         .t.tcm_ifindex = ifindex,
0303         .t.tcm_parent = handle,
0304     };
0305     int seq = time(NULL);
0306 
0307     req.nlh.nlmsg_seq = seq;
0308     if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
0309         return -errno;
0310 
0311     return netlink_recv(sock, nl_pid, seq, __dump_filter_nlmsg,
0312                 dump_filter_nlmsg, cookie);
0313 }
0314 
0315 static int __dump_link_nlmsg(struct nlmsghdr *nlh,
0316                  dump_nlmsg_t dump_link_nlmsg, void *cookie)
0317 {
0318     struct nlattr *tb[IFLA_MAX + 1], *attr;
0319     struct ifinfomsg *ifi = NLMSG_DATA(nlh);
0320     int len;
0321 
0322     len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
0323     attr = (struct nlattr *) ((void *) ifi + NLMSG_ALIGN(sizeof(*ifi)));
0324     if (libbpf_nla_parse(tb, IFLA_MAX, attr, len, NULL) != 0)
0325         return -LIBBPF_ERRNO__NLPARSE;
0326 
0327     return dump_link_nlmsg(cookie, ifi, tb);
0328 }
0329 
0330 static int netlink_get_link(int sock, unsigned int nl_pid,
0331                 dump_nlmsg_t dump_link_nlmsg, void *cookie)
0332 {
0333     struct {
0334         struct nlmsghdr nlh;
0335         struct ifinfomsg ifm;
0336     } req = {
0337         .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
0338         .nlh.nlmsg_type = RTM_GETLINK,
0339         .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
0340         .ifm.ifi_family = AF_PACKET,
0341     };
0342     int seq = time(NULL);
0343 
0344     req.nlh.nlmsg_seq = seq;
0345     if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
0346         return -errno;
0347 
0348     return netlink_recv(sock, nl_pid, seq, __dump_link_nlmsg,
0349                 dump_link_nlmsg, cookie);
0350 }
0351 
0352 static int dump_link_nlmsg(void *cookie, void *msg, struct nlattr **tb)
0353 {
0354     struct bpf_netdev_t *netinfo = cookie;
0355     struct ifinfomsg *ifinfo = msg;
0356 
0357     if (netinfo->filter_idx > 0 && netinfo->filter_idx != ifinfo->ifi_index)
0358         return 0;
0359 
0360     if (netinfo->used_len == netinfo->array_len) {
0361         netinfo->devices = realloc(netinfo->devices,
0362             (netinfo->array_len + 16) *
0363             sizeof(struct ip_devname_ifindex));
0364         if (!netinfo->devices)
0365             return -ENOMEM;
0366 
0367         netinfo->array_len += 16;
0368     }
0369     netinfo->devices[netinfo->used_len].ifindex = ifinfo->ifi_index;
0370     snprintf(netinfo->devices[netinfo->used_len].devname,
0371          sizeof(netinfo->devices[netinfo->used_len].devname),
0372          "%s",
0373          tb[IFLA_IFNAME]
0374              ? libbpf_nla_getattr_str(tb[IFLA_IFNAME])
0375              : "");
0376     netinfo->used_len++;
0377 
0378     return do_xdp_dump(ifinfo, tb);
0379 }
0380 
0381 static int dump_class_qdisc_nlmsg(void *cookie, void *msg, struct nlattr **tb)
0382 {
0383     struct bpf_tcinfo_t *tcinfo = cookie;
0384     struct tcmsg *info = msg;
0385 
0386     if (tcinfo->is_qdisc) {
0387         /* skip clsact qdisc */
0388         if (tb[TCA_KIND] &&
0389             strcmp(libbpf_nla_data(tb[TCA_KIND]), "clsact") == 0)
0390             return 0;
0391         if (info->tcm_handle == 0)
0392             return 0;
0393     }
0394 
0395     if (tcinfo->used_len == tcinfo->array_len) {
0396         tcinfo->handle_array = realloc(tcinfo->handle_array,
0397             (tcinfo->array_len + 16) * sizeof(struct tc_kind_handle));
0398         if (!tcinfo->handle_array)
0399             return -ENOMEM;
0400 
0401         tcinfo->array_len += 16;
0402     }
0403     tcinfo->handle_array[tcinfo->used_len].handle = info->tcm_handle;
0404     snprintf(tcinfo->handle_array[tcinfo->used_len].kind,
0405          sizeof(tcinfo->handle_array[tcinfo->used_len].kind),
0406          "%s",
0407          tb[TCA_KIND]
0408              ? libbpf_nla_getattr_str(tb[TCA_KIND])
0409              : "unknown");
0410     tcinfo->used_len++;
0411 
0412     return 0;
0413 }
0414 
0415 static int dump_filter_nlmsg(void *cookie, void *msg, struct nlattr **tb)
0416 {
0417     const struct bpf_filter_t *filter_info = cookie;
0418 
0419     return do_filter_dump((struct tcmsg *)msg, tb, filter_info->kind,
0420                   filter_info->devname, filter_info->ifindex);
0421 }
0422 
0423 static int show_dev_tc_bpf(int sock, unsigned int nl_pid,
0424                struct ip_devname_ifindex *dev)
0425 {
0426     struct bpf_filter_t filter_info;
0427     struct bpf_tcinfo_t tcinfo;
0428     int i, handle, ret = 0;
0429 
0430     tcinfo.handle_array = NULL;
0431     tcinfo.used_len = 0;
0432     tcinfo.array_len = 0;
0433 
0434     tcinfo.is_qdisc = false;
0435     ret = netlink_get_class(sock, nl_pid, dev->ifindex,
0436                 dump_class_qdisc_nlmsg, &tcinfo);
0437     if (ret)
0438         goto out;
0439 
0440     tcinfo.is_qdisc = true;
0441     ret = netlink_get_qdisc(sock, nl_pid, dev->ifindex,
0442                 dump_class_qdisc_nlmsg, &tcinfo);
0443     if (ret)
0444         goto out;
0445 
0446     filter_info.devname = dev->devname;
0447     filter_info.ifindex = dev->ifindex;
0448     for (i = 0; i < tcinfo.used_len; i++) {
0449         filter_info.kind = tcinfo.handle_array[i].kind;
0450         ret = netlink_get_filter(sock, nl_pid, dev->ifindex,
0451                      tcinfo.handle_array[i].handle,
0452                      dump_filter_nlmsg, &filter_info);
0453         if (ret)
0454             goto out;
0455     }
0456 
0457     /* root, ingress and egress handle */
0458     handle = TC_H_ROOT;
0459     filter_info.kind = "root";
0460     ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle,
0461                  dump_filter_nlmsg, &filter_info);
0462     if (ret)
0463         goto out;
0464 
0465     handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
0466     filter_info.kind = "clsact/ingress";
0467     ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle,
0468                  dump_filter_nlmsg, &filter_info);
0469     if (ret)
0470         goto out;
0471 
0472     handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_EGRESS);
0473     filter_info.kind = "clsact/egress";
0474     ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle,
0475                  dump_filter_nlmsg, &filter_info);
0476     if (ret)
0477         goto out;
0478 
0479 out:
0480     free(tcinfo.handle_array);
0481     return 0;
0482 }
0483 
0484 static int query_flow_dissector(struct bpf_attach_info *attach_info)
0485 {
0486     __u32 attach_flags;
0487     __u32 prog_ids[1];
0488     __u32 prog_cnt;
0489     int err;
0490     int fd;
0491 
0492     fd = open("/proc/self/ns/net", O_RDONLY);
0493     if (fd < 0) {
0494         p_err("can't open /proc/self/ns/net: %s",
0495               strerror(errno));
0496         return -1;
0497     }
0498     prog_cnt = ARRAY_SIZE(prog_ids);
0499     err = bpf_prog_query(fd, BPF_FLOW_DISSECTOR, 0,
0500                  &attach_flags, prog_ids, &prog_cnt);
0501     close(fd);
0502     if (err) {
0503         if (errno == EINVAL) {
0504             /* Older kernel's don't support querying
0505              * flow dissector programs.
0506              */
0507             errno = 0;
0508             return 0;
0509         }
0510         p_err("can't query prog: %s", strerror(errno));
0511         return -1;
0512     }
0513 
0514     if (prog_cnt == 1)
0515         attach_info->flow_dissector_id = prog_ids[0];
0516 
0517     return 0;
0518 }
0519 
0520 static int net_parse_dev(int *argc, char ***argv)
0521 {
0522     int ifindex;
0523 
0524     if (is_prefix(**argv, "dev")) {
0525         NEXT_ARGP();
0526 
0527         ifindex = if_nametoindex(**argv);
0528         if (!ifindex)
0529             p_err("invalid devname %s", **argv);
0530 
0531         NEXT_ARGP();
0532     } else {
0533         p_err("expected 'dev', got: '%s'?", **argv);
0534         return -1;
0535     }
0536 
0537     return ifindex;
0538 }
0539 
0540 static int do_attach_detach_xdp(int progfd, enum net_attach_type attach_type,
0541                 int ifindex, bool overwrite)
0542 {
0543     __u32 flags = 0;
0544 
0545     if (!overwrite)
0546         flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
0547     if (attach_type == NET_ATTACH_TYPE_XDP_GENERIC)
0548         flags |= XDP_FLAGS_SKB_MODE;
0549     if (attach_type == NET_ATTACH_TYPE_XDP_DRIVER)
0550         flags |= XDP_FLAGS_DRV_MODE;
0551     if (attach_type == NET_ATTACH_TYPE_XDP_OFFLOAD)
0552         flags |= XDP_FLAGS_HW_MODE;
0553 
0554     return bpf_xdp_attach(ifindex, progfd, flags, NULL);
0555 }
0556 
0557 static int do_attach(int argc, char **argv)
0558 {
0559     enum net_attach_type attach_type;
0560     int progfd, ifindex, err = 0;
0561     bool overwrite = false;
0562 
0563     /* parse attach args */
0564     if (!REQ_ARGS(5))
0565         return -EINVAL;
0566 
0567     attach_type = parse_attach_type(*argv);
0568     if (attach_type == net_attach_type_size) {
0569         p_err("invalid net attach/detach type: %s", *argv);
0570         return -EINVAL;
0571     }
0572     NEXT_ARG();
0573 
0574     progfd = prog_parse_fd(&argc, &argv);
0575     if (progfd < 0)
0576         return -EINVAL;
0577 
0578     ifindex = net_parse_dev(&argc, &argv);
0579     if (ifindex < 1) {
0580         err = -EINVAL;
0581         goto cleanup;
0582     }
0583 
0584     if (argc) {
0585         if (is_prefix(*argv, "overwrite")) {
0586             overwrite = true;
0587         } else {
0588             p_err("expected 'overwrite', got: '%s'?", *argv);
0589             err = -EINVAL;
0590             goto cleanup;
0591         }
0592     }
0593 
0594     /* attach xdp prog */
0595     if (is_prefix("xdp", attach_type_strings[attach_type]))
0596         err = do_attach_detach_xdp(progfd, attach_type, ifindex,
0597                        overwrite);
0598     if (err) {
0599         p_err("interface %s attach failed: %s",
0600               attach_type_strings[attach_type], strerror(-err));
0601         goto cleanup;
0602     }
0603 
0604     if (json_output)
0605         jsonw_null(json_wtr);
0606 cleanup:
0607     close(progfd);
0608     return err;
0609 }
0610 
0611 static int do_detach(int argc, char **argv)
0612 {
0613     enum net_attach_type attach_type;
0614     int progfd, ifindex, err = 0;
0615 
0616     /* parse detach args */
0617     if (!REQ_ARGS(3))
0618         return -EINVAL;
0619 
0620     attach_type = parse_attach_type(*argv);
0621     if (attach_type == net_attach_type_size) {
0622         p_err("invalid net attach/detach type: %s", *argv);
0623         return -EINVAL;
0624     }
0625     NEXT_ARG();
0626 
0627     ifindex = net_parse_dev(&argc, &argv);
0628     if (ifindex < 1)
0629         return -EINVAL;
0630 
0631     /* detach xdp prog */
0632     progfd = -1;
0633     if (is_prefix("xdp", attach_type_strings[attach_type]))
0634         err = do_attach_detach_xdp(progfd, attach_type, ifindex, NULL);
0635 
0636     if (err < 0) {
0637         p_err("interface %s detach failed: %s",
0638               attach_type_strings[attach_type], strerror(-err));
0639         return err;
0640     }
0641 
0642     if (json_output)
0643         jsonw_null(json_wtr);
0644 
0645     return 0;
0646 }
0647 
0648 static int do_show(int argc, char **argv)
0649 {
0650     struct bpf_attach_info attach_info = {};
0651     int i, sock, ret, filter_idx = -1;
0652     struct bpf_netdev_t dev_array;
0653     unsigned int nl_pid = 0;
0654     char err_buf[256];
0655 
0656     if (argc == 2) {
0657         filter_idx = net_parse_dev(&argc, &argv);
0658         if (filter_idx < 1)
0659             return -1;
0660     } else if (argc != 0) {
0661         usage();
0662     }
0663 
0664     ret = query_flow_dissector(&attach_info);
0665     if (ret)
0666         return -1;
0667 
0668     sock = netlink_open(&nl_pid);
0669     if (sock < 0) {
0670         fprintf(stderr, "failed to open netlink sock\n");
0671         return -1;
0672     }
0673 
0674     dev_array.devices = NULL;
0675     dev_array.used_len = 0;
0676     dev_array.array_len = 0;
0677     dev_array.filter_idx = filter_idx;
0678 
0679     if (json_output)
0680         jsonw_start_array(json_wtr);
0681     NET_START_OBJECT;
0682     NET_START_ARRAY("xdp", "%s:\n");
0683     ret = netlink_get_link(sock, nl_pid, dump_link_nlmsg, &dev_array);
0684     NET_END_ARRAY("\n");
0685 
0686     if (!ret) {
0687         NET_START_ARRAY("tc", "%s:\n");
0688         for (i = 0; i < dev_array.used_len; i++) {
0689             ret = show_dev_tc_bpf(sock, nl_pid,
0690                           &dev_array.devices[i]);
0691             if (ret)
0692                 break;
0693         }
0694         NET_END_ARRAY("\n");
0695     }
0696 
0697     NET_START_ARRAY("flow_dissector", "%s:\n");
0698     if (attach_info.flow_dissector_id > 0)
0699         NET_DUMP_UINT("id", "id %u", attach_info.flow_dissector_id);
0700     NET_END_ARRAY("\n");
0701 
0702     NET_END_OBJECT;
0703     if (json_output)
0704         jsonw_end_array(json_wtr);
0705 
0706     if (ret) {
0707         if (json_output)
0708             jsonw_null(json_wtr);
0709         libbpf_strerror(ret, err_buf, sizeof(err_buf));
0710         fprintf(stderr, "Error: %s\n", err_buf);
0711     }
0712     free(dev_array.devices);
0713     close(sock);
0714     return ret;
0715 }
0716 
0717 static int do_help(int argc, char **argv)
0718 {
0719     if (json_output) {
0720         jsonw_null(json_wtr);
0721         return 0;
0722     }
0723 
0724     fprintf(stderr,
0725         "Usage: %1$s %2$s { show | list } [dev <devname>]\n"
0726         "       %1$s %2$s attach ATTACH_TYPE PROG dev <devname> [ overwrite ]\n"
0727         "       %1$s %2$s detach ATTACH_TYPE dev <devname>\n"
0728         "       %1$s %2$s help\n"
0729         "\n"
0730         "       " HELP_SPEC_PROGRAM "\n"
0731         "       ATTACH_TYPE := { xdp | xdpgeneric | xdpdrv | xdpoffload }\n"
0732         "       " HELP_SPEC_OPTIONS " }\n"
0733         "\n"
0734         "Note: Only xdp and tc attachments are supported now.\n"
0735         "      For progs attached to cgroups, use \"bpftool cgroup\"\n"
0736         "      to dump program attachments. For program types\n"
0737         "      sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
0738         "      consult iproute2.\n"
0739         "",
0740         bin_name, argv[-2]);
0741 
0742     return 0;
0743 }
0744 
0745 static const struct cmd cmds[] = {
0746     { "show",   do_show },
0747     { "list",   do_show },
0748     { "attach", do_attach },
0749     { "detach", do_detach },
0750     { "help",   do_help },
0751     { 0 }
0752 };
0753 
0754 int do_net(int argc, char **argv)
0755 {
0756     return cmd_select(cmds, argc, argv, do_help);
0757 }
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