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-rw-r--r--tools/bpf/bpftool/net.c756
1 files changed, 756 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
new file mode 100644
index 000000000..ff3aa0cf3
--- /dev/null
+++ b/tools/bpf/bpftool/net.c
@@ -0,0 +1,756 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+// Copyright (C) 2018 Facebook
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+#include <net/if.h>
+#include <linux/rtnetlink.h>
+#include <linux/socket.h>
+#include <linux/tc_act/tc_bpf.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "bpf/nlattr.h"
+#include "main.h"
+#include "netlink_dumper.h"
+
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+struct ip_devname_ifindex {
+ char devname[64];
+ int ifindex;
+};
+
+struct bpf_netdev_t {
+ struct ip_devname_ifindex *devices;
+ int used_len;
+ int array_len;
+ int filter_idx;
+};
+
+struct tc_kind_handle {
+ char kind[64];
+ int handle;
+};
+
+struct bpf_tcinfo_t {
+ struct tc_kind_handle *handle_array;
+ int used_len;
+ int array_len;
+ bool is_qdisc;
+};
+
+struct bpf_filter_t {
+ const char *kind;
+ const char *devname;
+ int ifindex;
+};
+
+struct bpf_attach_info {
+ __u32 flow_dissector_id;
+};
+
+enum net_attach_type {
+ NET_ATTACH_TYPE_XDP,
+ NET_ATTACH_TYPE_XDP_GENERIC,
+ NET_ATTACH_TYPE_XDP_DRIVER,
+ NET_ATTACH_TYPE_XDP_OFFLOAD,
+};
+
+static const char * const attach_type_strings[] = {
+ [NET_ATTACH_TYPE_XDP] = "xdp",
+ [NET_ATTACH_TYPE_XDP_GENERIC] = "xdpgeneric",
+ [NET_ATTACH_TYPE_XDP_DRIVER] = "xdpdrv",
+ [NET_ATTACH_TYPE_XDP_OFFLOAD] = "xdpoffload",
+};
+
+const size_t net_attach_type_size = ARRAY_SIZE(attach_type_strings);
+
+static enum net_attach_type parse_attach_type(const char *str)
+{
+ enum net_attach_type type;
+
+ for (type = 0; type < net_attach_type_size; type++) {
+ if (attach_type_strings[type] &&
+ is_prefix(str, attach_type_strings[type]))
+ return type;
+ }
+
+ return net_attach_type_size;
+}
+
+typedef int (*dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
+
+typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, dump_nlmsg_t, void *cookie);
+
+static int netlink_open(__u32 *nl_pid)
+{
+ struct sockaddr_nl sa;
+ socklen_t addrlen;
+ int one = 1, ret;
+ int sock;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+
+ sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (sock < 0)
+ return -errno;
+
+ if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK,
+ &one, sizeof(one)) < 0) {
+ p_err("Netlink error reporting not supported");
+ }
+
+ if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
+ ret = -errno;
+ goto cleanup;
+ }
+
+ addrlen = sizeof(sa);
+ if (getsockname(sock, (struct sockaddr *)&sa, &addrlen) < 0) {
+ ret = -errno;
+ goto cleanup;
+ }
+
+ if (addrlen != sizeof(sa)) {
+ ret = -LIBBPF_ERRNO__INTERNAL;
+ goto cleanup;
+ }
+
+ *nl_pid = sa.nl_pid;
+ return sock;
+
+cleanup:
+ close(sock);
+ return ret;
+}
+
+static int netlink_recv(int sock, __u32 nl_pid, __u32 seq,
+ __dump_nlmsg_t _fn, dump_nlmsg_t fn,
+ void *cookie)
+{
+ bool multipart = true;
+ struct nlmsgerr *err;
+ struct nlmsghdr *nh;
+ char buf[4096];
+ int len, ret;
+
+ while (multipart) {
+ multipart = false;
+ len = recv(sock, buf, sizeof(buf), 0);
+ if (len < 0) {
+ ret = -errno;
+ goto done;
+ }
+
+ if (len == 0)
+ break;
+
+ for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
+ nh = NLMSG_NEXT(nh, len)) {
+ if (nh->nlmsg_pid != nl_pid) {
+ ret = -LIBBPF_ERRNO__WRNGPID;
+ goto done;
+ }
+ if (nh->nlmsg_seq != seq) {
+ ret = -LIBBPF_ERRNO__INVSEQ;
+ goto done;
+ }
+ if (nh->nlmsg_flags & NLM_F_MULTI)
+ multipart = true;
+ switch (nh->nlmsg_type) {
+ case NLMSG_ERROR:
+ err = (struct nlmsgerr *)NLMSG_DATA(nh);
+ if (!err->error)
+ continue;
+ ret = err->error;
+ libbpf_nla_dump_errormsg(nh);
+ goto done;
+ case NLMSG_DONE:
+ return 0;
+ default:
+ break;
+ }
+ if (_fn) {
+ ret = _fn(nh, fn, cookie);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+ ret = 0;
+done:
+ return ret;
+}
+
+static int __dump_class_nlmsg(struct nlmsghdr *nlh,
+ dump_nlmsg_t dump_class_nlmsg,
+ void *cookie)
+{
+ struct nlattr *tb[TCA_MAX + 1], *attr;
+ struct tcmsg *t = NLMSG_DATA(nlh);
+ int len;
+
+ len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
+ attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
+ if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
+ return -LIBBPF_ERRNO__NLPARSE;
+
+ return dump_class_nlmsg(cookie, t, tb);
+}
+
+static int netlink_get_class(int sock, unsigned int nl_pid, int ifindex,
+ dump_nlmsg_t dump_class_nlmsg, void *cookie)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct tcmsg t;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
+ .nlh.nlmsg_type = RTM_GETTCLASS,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .t.tcm_family = AF_UNSPEC,
+ .t.tcm_ifindex = ifindex,
+ };
+ int seq = time(NULL);
+
+ req.nlh.nlmsg_seq = seq;
+ if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
+ return -errno;
+
+ return netlink_recv(sock, nl_pid, seq, __dump_class_nlmsg,
+ dump_class_nlmsg, cookie);
+}
+
+static int __dump_qdisc_nlmsg(struct nlmsghdr *nlh,
+ dump_nlmsg_t dump_qdisc_nlmsg,
+ void *cookie)
+{
+ struct nlattr *tb[TCA_MAX + 1], *attr;
+ struct tcmsg *t = NLMSG_DATA(nlh);
+ int len;
+
+ len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
+ attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
+ if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
+ return -LIBBPF_ERRNO__NLPARSE;
+
+ return dump_qdisc_nlmsg(cookie, t, tb);
+}
+
+static int netlink_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
+ dump_nlmsg_t dump_qdisc_nlmsg, void *cookie)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct tcmsg t;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
+ .nlh.nlmsg_type = RTM_GETQDISC,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .t.tcm_family = AF_UNSPEC,
+ .t.tcm_ifindex = ifindex,
+ };
+ int seq = time(NULL);
+
+ req.nlh.nlmsg_seq = seq;
+ if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
+ return -errno;
+
+ return netlink_recv(sock, nl_pid, seq, __dump_qdisc_nlmsg,
+ dump_qdisc_nlmsg, cookie);
+}
+
+static int __dump_filter_nlmsg(struct nlmsghdr *nlh,
+ dump_nlmsg_t dump_filter_nlmsg,
+ void *cookie)
+{
+ struct nlattr *tb[TCA_MAX + 1], *attr;
+ struct tcmsg *t = NLMSG_DATA(nlh);
+ int len;
+
+ len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
+ attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
+ if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
+ return -LIBBPF_ERRNO__NLPARSE;
+
+ return dump_filter_nlmsg(cookie, t, tb);
+}
+
+static int netlink_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
+ dump_nlmsg_t dump_filter_nlmsg, void *cookie)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct tcmsg t;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
+ .nlh.nlmsg_type = RTM_GETTFILTER,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .t.tcm_family = AF_UNSPEC,
+ .t.tcm_ifindex = ifindex,
+ .t.tcm_parent = handle,
+ };
+ int seq = time(NULL);
+
+ req.nlh.nlmsg_seq = seq;
+ if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
+ return -errno;
+
+ return netlink_recv(sock, nl_pid, seq, __dump_filter_nlmsg,
+ dump_filter_nlmsg, cookie);
+}
+
+static int __dump_link_nlmsg(struct nlmsghdr *nlh,
+ dump_nlmsg_t dump_link_nlmsg, void *cookie)
+{
+ struct nlattr *tb[IFLA_MAX + 1], *attr;
+ struct ifinfomsg *ifi = NLMSG_DATA(nlh);
+ int len;
+
+ len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
+ attr = (struct nlattr *) ((void *) ifi + NLMSG_ALIGN(sizeof(*ifi)));
+ if (libbpf_nla_parse(tb, IFLA_MAX, attr, len, NULL) != 0)
+ return -LIBBPF_ERRNO__NLPARSE;
+
+ return dump_link_nlmsg(cookie, ifi, tb);
+}
+
+static int netlink_get_link(int sock, unsigned int nl_pid,
+ dump_nlmsg_t dump_link_nlmsg, void *cookie)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ifinfomsg ifm;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .nlh.nlmsg_type = RTM_GETLINK,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .ifm.ifi_family = AF_PACKET,
+ };
+ int seq = time(NULL);
+
+ req.nlh.nlmsg_seq = seq;
+ if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
+ return -errno;
+
+ return netlink_recv(sock, nl_pid, seq, __dump_link_nlmsg,
+ dump_link_nlmsg, cookie);
+}
+
+static int dump_link_nlmsg(void *cookie, void *msg, struct nlattr **tb)
+{
+ struct bpf_netdev_t *netinfo = cookie;
+ struct ifinfomsg *ifinfo = msg;
+
+ if (netinfo->filter_idx > 0 && netinfo->filter_idx != ifinfo->ifi_index)
+ return 0;
+
+ if (netinfo->used_len == netinfo->array_len) {
+ netinfo->devices = realloc(netinfo->devices,
+ (netinfo->array_len + 16) *
+ sizeof(struct ip_devname_ifindex));
+ if (!netinfo->devices)
+ return -ENOMEM;
+
+ netinfo->array_len += 16;
+ }
+ netinfo->devices[netinfo->used_len].ifindex = ifinfo->ifi_index;
+ snprintf(netinfo->devices[netinfo->used_len].devname,
+ sizeof(netinfo->devices[netinfo->used_len].devname),
+ "%s",
+ tb[IFLA_IFNAME]
+ ? libbpf_nla_getattr_str(tb[IFLA_IFNAME])
+ : "");
+ netinfo->used_len++;
+
+ return do_xdp_dump(ifinfo, tb);
+}
+
+static int dump_class_qdisc_nlmsg(void *cookie, void *msg, struct nlattr **tb)
+{
+ struct bpf_tcinfo_t *tcinfo = cookie;
+ struct tcmsg *info = msg;
+
+ if (tcinfo->is_qdisc) {
+ /* skip clsact qdisc */
+ if (tb[TCA_KIND] &&
+ strcmp(libbpf_nla_data(tb[TCA_KIND]), "clsact") == 0)
+ return 0;
+ if (info->tcm_handle == 0)
+ return 0;
+ }
+
+ if (tcinfo->used_len == tcinfo->array_len) {
+ tcinfo->handle_array = realloc(tcinfo->handle_array,
+ (tcinfo->array_len + 16) * sizeof(struct tc_kind_handle));
+ if (!tcinfo->handle_array)
+ return -ENOMEM;
+
+ tcinfo->array_len += 16;
+ }
+ tcinfo->handle_array[tcinfo->used_len].handle = info->tcm_handle;
+ snprintf(tcinfo->handle_array[tcinfo->used_len].kind,
+ sizeof(tcinfo->handle_array[tcinfo->used_len].kind),
+ "%s",
+ tb[TCA_KIND]
+ ? libbpf_nla_getattr_str(tb[TCA_KIND])
+ : "unknown");
+ tcinfo->used_len++;
+
+ return 0;
+}
+
+static int dump_filter_nlmsg(void *cookie, void *msg, struct nlattr **tb)
+{
+ const struct bpf_filter_t *filter_info = cookie;
+
+ return do_filter_dump((struct tcmsg *)msg, tb, filter_info->kind,
+ filter_info->devname, filter_info->ifindex);
+}
+
+static int show_dev_tc_bpf(int sock, unsigned int nl_pid,
+ struct ip_devname_ifindex *dev)
+{
+ struct bpf_filter_t filter_info;
+ struct bpf_tcinfo_t tcinfo;
+ int i, handle, ret = 0;
+
+ tcinfo.handle_array = NULL;
+ tcinfo.used_len = 0;
+ tcinfo.array_len = 0;
+
+ tcinfo.is_qdisc = false;
+ ret = netlink_get_class(sock, nl_pid, dev->ifindex,
+ dump_class_qdisc_nlmsg, &tcinfo);
+ if (ret)
+ goto out;
+
+ tcinfo.is_qdisc = true;
+ ret = netlink_get_qdisc(sock, nl_pid, dev->ifindex,
+ dump_class_qdisc_nlmsg, &tcinfo);
+ if (ret)
+ goto out;
+
+ filter_info.devname = dev->devname;
+ filter_info.ifindex = dev->ifindex;
+ for (i = 0; i < tcinfo.used_len; i++) {
+ filter_info.kind = tcinfo.handle_array[i].kind;
+ ret = netlink_get_filter(sock, nl_pid, dev->ifindex,
+ tcinfo.handle_array[i].handle,
+ dump_filter_nlmsg, &filter_info);
+ if (ret)
+ goto out;
+ }
+
+ /* root, ingress and egress handle */
+ handle = TC_H_ROOT;
+ filter_info.kind = "root";
+ ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle,
+ dump_filter_nlmsg, &filter_info);
+ if (ret)
+ goto out;
+
+ handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
+ filter_info.kind = "clsact/ingress";
+ ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle,
+ dump_filter_nlmsg, &filter_info);
+ if (ret)
+ goto out;
+
+ handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_EGRESS);
+ filter_info.kind = "clsact/egress";
+ ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle,
+ dump_filter_nlmsg, &filter_info);
+ if (ret)
+ goto out;
+
+out:
+ free(tcinfo.handle_array);
+ return 0;
+}
+
+static int query_flow_dissector(struct bpf_attach_info *attach_info)
+{
+ __u32 attach_flags;
+ __u32 prog_ids[1];
+ __u32 prog_cnt;
+ int err;
+ int fd;
+
+ fd = open("/proc/self/ns/net", O_RDONLY);
+ if (fd < 0) {
+ p_err("can't open /proc/self/ns/net: %s",
+ strerror(errno));
+ return -1;
+ }
+ prog_cnt = ARRAY_SIZE(prog_ids);
+ err = bpf_prog_query(fd, BPF_FLOW_DISSECTOR, 0,
+ &attach_flags, prog_ids, &prog_cnt);
+ close(fd);
+ if (err) {
+ if (errno == EINVAL) {
+ /* Older kernel's don't support querying
+ * flow dissector programs.
+ */
+ errno = 0;
+ return 0;
+ }
+ p_err("can't query prog: %s", strerror(errno));
+ return -1;
+ }
+
+ if (prog_cnt == 1)
+ attach_info->flow_dissector_id = prog_ids[0];
+
+ return 0;
+}
+
+static int net_parse_dev(int *argc, char ***argv)
+{
+ int ifindex;
+
+ if (is_prefix(**argv, "dev")) {
+ NEXT_ARGP();
+
+ ifindex = if_nametoindex(**argv);
+ if (!ifindex)
+ p_err("invalid devname %s", **argv);
+
+ NEXT_ARGP();
+ } else {
+ p_err("expected 'dev', got: '%s'?", **argv);
+ return -1;
+ }
+
+ return ifindex;
+}
+
+static int do_attach_detach_xdp(int progfd, enum net_attach_type attach_type,
+ int ifindex, bool overwrite)
+{
+ __u32 flags = 0;
+
+ if (!overwrite)
+ flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+ if (attach_type == NET_ATTACH_TYPE_XDP_GENERIC)
+ flags |= XDP_FLAGS_SKB_MODE;
+ if (attach_type == NET_ATTACH_TYPE_XDP_DRIVER)
+ flags |= XDP_FLAGS_DRV_MODE;
+ if (attach_type == NET_ATTACH_TYPE_XDP_OFFLOAD)
+ flags |= XDP_FLAGS_HW_MODE;
+
+ return bpf_set_link_xdp_fd(ifindex, progfd, flags);
+}
+
+static int do_attach(int argc, char **argv)
+{
+ enum net_attach_type attach_type;
+ int progfd, ifindex, err = 0;
+ bool overwrite = false;
+
+ /* parse attach args */
+ if (!REQ_ARGS(5))
+ return -EINVAL;
+
+ attach_type = parse_attach_type(*argv);
+ if (attach_type == net_attach_type_size) {
+ p_err("invalid net attach/detach type: %s", *argv);
+ return -EINVAL;
+ }
+ NEXT_ARG();
+
+ progfd = prog_parse_fd(&argc, &argv);
+ if (progfd < 0)
+ return -EINVAL;
+
+ ifindex = net_parse_dev(&argc, &argv);
+ if (ifindex < 1) {
+ err = -EINVAL;
+ goto cleanup;
+ }
+
+ if (argc) {
+ if (is_prefix(*argv, "overwrite")) {
+ overwrite = true;
+ } else {
+ p_err("expected 'overwrite', got: '%s'?", *argv);
+ err = -EINVAL;
+ goto cleanup;
+ }
+ }
+
+ /* attach xdp prog */
+ if (is_prefix("xdp", attach_type_strings[attach_type]))
+ err = do_attach_detach_xdp(progfd, attach_type, ifindex,
+ overwrite);
+ if (err) {
+ p_err("interface %s attach failed: %s",
+ attach_type_strings[attach_type], strerror(-err));
+ goto cleanup;
+ }
+
+ if (json_output)
+ jsonw_null(json_wtr);
+cleanup:
+ close(progfd);
+ return err;
+}
+
+static int do_detach(int argc, char **argv)
+{
+ enum net_attach_type attach_type;
+ int progfd, ifindex, err = 0;
+
+ /* parse detach args */
+ if (!REQ_ARGS(3))
+ return -EINVAL;
+
+ attach_type = parse_attach_type(*argv);
+ if (attach_type == net_attach_type_size) {
+ p_err("invalid net attach/detach type: %s", *argv);
+ return -EINVAL;
+ }
+ NEXT_ARG();
+
+ ifindex = net_parse_dev(&argc, &argv);
+ if (ifindex < 1)
+ return -EINVAL;
+
+ /* detach xdp prog */
+ progfd = -1;
+ if (is_prefix("xdp", attach_type_strings[attach_type]))
+ err = do_attach_detach_xdp(progfd, attach_type, ifindex, NULL);
+
+ if (err < 0) {
+ p_err("interface %s detach failed: %s",
+ attach_type_strings[attach_type], strerror(-err));
+ return err;
+ }
+
+ if (json_output)
+ jsonw_null(json_wtr);
+
+ return 0;
+}
+
+static int do_show(int argc, char **argv)
+{
+ struct bpf_attach_info attach_info = {};
+ int i, sock, ret, filter_idx = -1;
+ struct bpf_netdev_t dev_array;
+ unsigned int nl_pid = 0;
+ char err_buf[256];
+
+ if (argc == 2) {
+ filter_idx = net_parse_dev(&argc, &argv);
+ if (filter_idx < 1)
+ return -1;
+ } else if (argc != 0) {
+ usage();
+ }
+
+ ret = query_flow_dissector(&attach_info);
+ if (ret)
+ return -1;
+
+ sock = netlink_open(&nl_pid);
+ if (sock < 0) {
+ fprintf(stderr, "failed to open netlink sock\n");
+ return -1;
+ }
+
+ dev_array.devices = NULL;
+ dev_array.used_len = 0;
+ dev_array.array_len = 0;
+ dev_array.filter_idx = filter_idx;
+
+ if (json_output)
+ jsonw_start_array(json_wtr);
+ NET_START_OBJECT;
+ NET_START_ARRAY("xdp", "%s:\n");
+ ret = netlink_get_link(sock, nl_pid, dump_link_nlmsg, &dev_array);
+ NET_END_ARRAY("\n");
+
+ if (!ret) {
+ NET_START_ARRAY("tc", "%s:\n");
+ for (i = 0; i < dev_array.used_len; i++) {
+ ret = show_dev_tc_bpf(sock, nl_pid,
+ &dev_array.devices[i]);
+ if (ret)
+ break;
+ }
+ NET_END_ARRAY("\n");
+ }
+
+ NET_START_ARRAY("flow_dissector", "%s:\n");
+ if (attach_info.flow_dissector_id > 0)
+ NET_DUMP_UINT("id", "id %u", attach_info.flow_dissector_id);
+ NET_END_ARRAY("\n");
+
+ NET_END_OBJECT;
+ if (json_output)
+ jsonw_end_array(json_wtr);
+
+ if (ret) {
+ if (json_output)
+ jsonw_null(json_wtr);
+ libbpf_strerror(ret, err_buf, sizeof(err_buf));
+ fprintf(stderr, "Error: %s\n", err_buf);
+ }
+ free(dev_array.devices);
+ close(sock);
+ return ret;
+}
+
+static int do_help(int argc, char **argv)
+{
+ if (json_output) {
+ jsonw_null(json_wtr);
+ return 0;
+ }
+
+ fprintf(stderr,
+ "Usage: %1$s %2$s { show | list } [dev <devname>]\n"
+ " %1$s %2$s attach ATTACH_TYPE PROG dev <devname> [ overwrite ]\n"
+ " %1$s %2$s detach ATTACH_TYPE dev <devname>\n"
+ " %1$s %2$s help\n"
+ "\n"
+ " " HELP_SPEC_PROGRAM "\n"
+ " ATTACH_TYPE := { xdp | xdpgeneric | xdpdrv | xdpoffload }\n"
+ "\n"
+ "Note: Only xdp and tc attachments are supported now.\n"
+ " For progs attached to cgroups, use \"bpftool cgroup\"\n"
+ " to dump program attachments. For program types\n"
+ " sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
+ " consult iproute2.\n"
+ "",
+ bin_name, argv[-2]);
+
+ return 0;
+}
+
+static const struct cmd cmds[] = {
+ { "show", do_show },
+ { "list", do_show },
+ { "attach", do_attach },
+ { "detach", do_detach },
+ { "help", do_help },
+ { 0 }
+};
+
+int do_net(int argc, char **argv)
+{
+ return cmd_select(cmds, argc, argv, do_help);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 19:57:07 +0000