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757 lines
17 KiB
757 lines
17 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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// Copyright (C) 2018 Facebook |
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#define _GNU_SOURCE |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <time.h> |
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#include <unistd.h> |
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> |
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#include <net/if.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/socket.h> |
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#include <linux/tc_act/tc_bpf.h> |
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#include <sys/socket.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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|
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#include "bpf/nlattr.h" |
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#include "main.h" |
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#include "netlink_dumper.h" |
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#ifndef SOL_NETLINK |
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#define SOL_NETLINK 270 |
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#endif |
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struct ip_devname_ifindex { |
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char devname[64]; |
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int ifindex; |
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}; |
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struct bpf_netdev_t { |
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struct ip_devname_ifindex *devices; |
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int used_len; |
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int array_len; |
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int filter_idx; |
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}; |
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struct tc_kind_handle { |
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char kind[64]; |
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int handle; |
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}; |
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struct bpf_tcinfo_t { |
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struct tc_kind_handle *handle_array; |
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int used_len; |
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int array_len; |
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bool is_qdisc; |
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}; |
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struct bpf_filter_t { |
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const char *kind; |
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const char *devname; |
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int ifindex; |
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}; |
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struct bpf_attach_info { |
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__u32 flow_dissector_id; |
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}; |
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enum net_attach_type { |
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NET_ATTACH_TYPE_XDP, |
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NET_ATTACH_TYPE_XDP_GENERIC, |
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NET_ATTACH_TYPE_XDP_DRIVER, |
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NET_ATTACH_TYPE_XDP_OFFLOAD, |
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}; |
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static const char * const attach_type_strings[] = { |
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[NET_ATTACH_TYPE_XDP] = "xdp", |
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[NET_ATTACH_TYPE_XDP_GENERIC] = "xdpgeneric", |
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[NET_ATTACH_TYPE_XDP_DRIVER] = "xdpdrv", |
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[NET_ATTACH_TYPE_XDP_OFFLOAD] = "xdpoffload", |
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}; |
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const size_t net_attach_type_size = ARRAY_SIZE(attach_type_strings); |
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static enum net_attach_type parse_attach_type(const char *str) |
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{ |
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enum net_attach_type type; |
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for (type = 0; type < net_attach_type_size; type++) { |
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if (attach_type_strings[type] && |
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is_prefix(str, attach_type_strings[type])) |
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return type; |
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} |
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return net_attach_type_size; |
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} |
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typedef int (*dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb); |
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typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, dump_nlmsg_t, void *cookie); |
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static int netlink_open(__u32 *nl_pid) |
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{ |
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struct sockaddr_nl sa; |
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socklen_t addrlen; |
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int one = 1, ret; |
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int sock; |
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memset(&sa, 0, sizeof(sa)); |
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sa.nl_family = AF_NETLINK; |
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sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
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if (sock < 0) |
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return -errno; |
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if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK, |
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&one, sizeof(one)) < 0) { |
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p_err("Netlink error reporting not supported"); |
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} |
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if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) { |
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ret = -errno; |
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goto cleanup; |
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} |
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addrlen = sizeof(sa); |
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if (getsockname(sock, (struct sockaddr *)&sa, &addrlen) < 0) { |
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ret = -errno; |
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goto cleanup; |
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} |
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if (addrlen != sizeof(sa)) { |
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ret = -LIBBPF_ERRNO__INTERNAL; |
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goto cleanup; |
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} |
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*nl_pid = sa.nl_pid; |
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return sock; |
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cleanup: |
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close(sock); |
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return ret; |
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} |
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static int netlink_recv(int sock, __u32 nl_pid, __u32 seq, |
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__dump_nlmsg_t _fn, dump_nlmsg_t fn, |
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void *cookie) |
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{ |
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bool multipart = true; |
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struct nlmsgerr *err; |
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struct nlmsghdr *nh; |
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char buf[4096]; |
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int len, ret; |
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while (multipart) { |
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multipart = false; |
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len = recv(sock, buf, sizeof(buf), 0); |
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if (len < 0) { |
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ret = -errno; |
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goto done; |
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} |
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if (len == 0) |
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break; |
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for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, (unsigned int)len); |
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nh = NLMSG_NEXT(nh, len)) { |
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if (nh->nlmsg_pid != nl_pid) { |
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ret = -LIBBPF_ERRNO__WRNGPID; |
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goto done; |
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} |
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if (nh->nlmsg_seq != seq) { |
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ret = -LIBBPF_ERRNO__INVSEQ; |
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goto done; |
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} |
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if (nh->nlmsg_flags & NLM_F_MULTI) |
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multipart = true; |
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switch (nh->nlmsg_type) { |
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case NLMSG_ERROR: |
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err = (struct nlmsgerr *)NLMSG_DATA(nh); |
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if (!err->error) |
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continue; |
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ret = err->error; |
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libbpf_nla_dump_errormsg(nh); |
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goto done; |
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case NLMSG_DONE: |
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return 0; |
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default: |
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break; |
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} |
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if (_fn) { |
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ret = _fn(nh, fn, cookie); |
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if (ret) |
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return ret; |
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} |
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} |
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} |
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ret = 0; |
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done: |
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return ret; |
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} |
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static int __dump_class_nlmsg(struct nlmsghdr *nlh, |
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dump_nlmsg_t dump_class_nlmsg, |
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void *cookie) |
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{ |
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struct nlattr *tb[TCA_MAX + 1], *attr; |
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struct tcmsg *t = NLMSG_DATA(nlh); |
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int len; |
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len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t)); |
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attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t))); |
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if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0) |
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return -LIBBPF_ERRNO__NLPARSE; |
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return dump_class_nlmsg(cookie, t, tb); |
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} |
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static int netlink_get_class(int sock, unsigned int nl_pid, int ifindex, |
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dump_nlmsg_t dump_class_nlmsg, void *cookie) |
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{ |
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struct { |
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struct nlmsghdr nlh; |
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struct tcmsg t; |
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} req = { |
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.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), |
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.nlh.nlmsg_type = RTM_GETTCLASS, |
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.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
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.t.tcm_family = AF_UNSPEC, |
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.t.tcm_ifindex = ifindex, |
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}; |
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int seq = time(NULL); |
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req.nlh.nlmsg_seq = seq; |
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if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
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return -errno; |
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return netlink_recv(sock, nl_pid, seq, __dump_class_nlmsg, |
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dump_class_nlmsg, cookie); |
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} |
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static int __dump_qdisc_nlmsg(struct nlmsghdr *nlh, |
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dump_nlmsg_t dump_qdisc_nlmsg, |
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void *cookie) |
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{ |
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struct nlattr *tb[TCA_MAX + 1], *attr; |
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struct tcmsg *t = NLMSG_DATA(nlh); |
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int len; |
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len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t)); |
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attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t))); |
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if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0) |
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return -LIBBPF_ERRNO__NLPARSE; |
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return dump_qdisc_nlmsg(cookie, t, tb); |
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} |
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static int netlink_get_qdisc(int sock, unsigned int nl_pid, int ifindex, |
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dump_nlmsg_t dump_qdisc_nlmsg, void *cookie) |
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{ |
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struct { |
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struct nlmsghdr nlh; |
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struct tcmsg t; |
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} req = { |
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.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), |
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.nlh.nlmsg_type = RTM_GETQDISC, |
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.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
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.t.tcm_family = AF_UNSPEC, |
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.t.tcm_ifindex = ifindex, |
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}; |
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int seq = time(NULL); |
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req.nlh.nlmsg_seq = seq; |
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if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
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return -errno; |
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return netlink_recv(sock, nl_pid, seq, __dump_qdisc_nlmsg, |
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dump_qdisc_nlmsg, cookie); |
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} |
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static int __dump_filter_nlmsg(struct nlmsghdr *nlh, |
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dump_nlmsg_t dump_filter_nlmsg, |
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void *cookie) |
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{ |
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struct nlattr *tb[TCA_MAX + 1], *attr; |
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struct tcmsg *t = NLMSG_DATA(nlh); |
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int len; |
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len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t)); |
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attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t))); |
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if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0) |
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return -LIBBPF_ERRNO__NLPARSE; |
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return dump_filter_nlmsg(cookie, t, tb); |
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} |
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static int netlink_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle, |
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dump_nlmsg_t dump_filter_nlmsg, void *cookie) |
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{ |
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struct { |
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struct nlmsghdr nlh; |
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struct tcmsg t; |
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} req = { |
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.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), |
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.nlh.nlmsg_type = RTM_GETTFILTER, |
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.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
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.t.tcm_family = AF_UNSPEC, |
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.t.tcm_ifindex = ifindex, |
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.t.tcm_parent = handle, |
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}; |
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int seq = time(NULL); |
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req.nlh.nlmsg_seq = seq; |
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if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
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return -errno; |
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return netlink_recv(sock, nl_pid, seq, __dump_filter_nlmsg, |
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dump_filter_nlmsg, cookie); |
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} |
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static int __dump_link_nlmsg(struct nlmsghdr *nlh, |
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dump_nlmsg_t dump_link_nlmsg, void *cookie) |
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{ |
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struct nlattr *tb[IFLA_MAX + 1], *attr; |
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struct ifinfomsg *ifi = NLMSG_DATA(nlh); |
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int len; |
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len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi)); |
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attr = (struct nlattr *) ((void *) ifi + NLMSG_ALIGN(sizeof(*ifi))); |
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if (libbpf_nla_parse(tb, IFLA_MAX, attr, len, NULL) != 0) |
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return -LIBBPF_ERRNO__NLPARSE; |
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return dump_link_nlmsg(cookie, ifi, tb); |
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} |
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static int netlink_get_link(int sock, unsigned int nl_pid, |
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dump_nlmsg_t dump_link_nlmsg, void *cookie) |
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{ |
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struct { |
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struct nlmsghdr nlh; |
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struct ifinfomsg ifm; |
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} req = { |
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.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
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.nlh.nlmsg_type = RTM_GETLINK, |
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.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
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.ifm.ifi_family = AF_PACKET, |
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}; |
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int seq = time(NULL); |
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req.nlh.nlmsg_seq = seq; |
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if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
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return -errno; |
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return netlink_recv(sock, nl_pid, seq, __dump_link_nlmsg, |
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dump_link_nlmsg, cookie); |
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} |
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static int dump_link_nlmsg(void *cookie, void *msg, struct nlattr **tb) |
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{ |
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struct bpf_netdev_t *netinfo = cookie; |
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struct ifinfomsg *ifinfo = msg; |
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if (netinfo->filter_idx > 0 && netinfo->filter_idx != ifinfo->ifi_index) |
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return 0; |
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if (netinfo->used_len == netinfo->array_len) { |
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netinfo->devices = realloc(netinfo->devices, |
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(netinfo->array_len + 16) * |
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sizeof(struct ip_devname_ifindex)); |
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if (!netinfo->devices) |
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return -ENOMEM; |
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netinfo->array_len += 16; |
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} |
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netinfo->devices[netinfo->used_len].ifindex = ifinfo->ifi_index; |
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snprintf(netinfo->devices[netinfo->used_len].devname, |
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sizeof(netinfo->devices[netinfo->used_len].devname), |
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"%s", |
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tb[IFLA_IFNAME] |
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? libbpf_nla_getattr_str(tb[IFLA_IFNAME]) |
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: ""); |
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netinfo->used_len++; |
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return do_xdp_dump(ifinfo, tb); |
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} |
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static int dump_class_qdisc_nlmsg(void *cookie, void *msg, struct nlattr **tb) |
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{ |
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struct bpf_tcinfo_t *tcinfo = cookie; |
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struct tcmsg *info = msg; |
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if (tcinfo->is_qdisc) { |
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/* skip clsact qdisc */ |
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if (tb[TCA_KIND] && |
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strcmp(libbpf_nla_data(tb[TCA_KIND]), "clsact") == 0) |
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return 0; |
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if (info->tcm_handle == 0) |
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return 0; |
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} |
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if (tcinfo->used_len == tcinfo->array_len) { |
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tcinfo->handle_array = realloc(tcinfo->handle_array, |
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(tcinfo->array_len + 16) * sizeof(struct tc_kind_handle)); |
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if (!tcinfo->handle_array) |
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return -ENOMEM; |
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tcinfo->array_len += 16; |
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} |
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tcinfo->handle_array[tcinfo->used_len].handle = info->tcm_handle; |
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snprintf(tcinfo->handle_array[tcinfo->used_len].kind, |
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sizeof(tcinfo->handle_array[tcinfo->used_len].kind), |
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"%s", |
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tb[TCA_KIND] |
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? libbpf_nla_getattr_str(tb[TCA_KIND]) |
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: "unknown"); |
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tcinfo->used_len++; |
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return 0; |
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} |
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static int dump_filter_nlmsg(void *cookie, void *msg, struct nlattr **tb) |
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{ |
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const struct bpf_filter_t *filter_info = cookie; |
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return do_filter_dump((struct tcmsg *)msg, tb, filter_info->kind, |
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filter_info->devname, filter_info->ifindex); |
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} |
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static int show_dev_tc_bpf(int sock, unsigned int nl_pid, |
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struct ip_devname_ifindex *dev) |
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{ |
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struct bpf_filter_t filter_info; |
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struct bpf_tcinfo_t tcinfo; |
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int i, handle, ret = 0; |
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tcinfo.handle_array = NULL; |
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tcinfo.used_len = 0; |
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tcinfo.array_len = 0; |
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tcinfo.is_qdisc = false; |
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ret = netlink_get_class(sock, nl_pid, dev->ifindex, |
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dump_class_qdisc_nlmsg, &tcinfo); |
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if (ret) |
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goto out; |
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tcinfo.is_qdisc = true; |
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ret = netlink_get_qdisc(sock, nl_pid, dev->ifindex, |
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dump_class_qdisc_nlmsg, &tcinfo); |
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if (ret) |
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goto out; |
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filter_info.devname = dev->devname; |
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filter_info.ifindex = dev->ifindex; |
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for (i = 0; i < tcinfo.used_len; i++) { |
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filter_info.kind = tcinfo.handle_array[i].kind; |
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ret = netlink_get_filter(sock, nl_pid, dev->ifindex, |
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tcinfo.handle_array[i].handle, |
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dump_filter_nlmsg, &filter_info); |
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if (ret) |
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goto out; |
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} |
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/* root, ingress and egress handle */ |
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handle = TC_H_ROOT; |
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filter_info.kind = "root"; |
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ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle, |
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dump_filter_nlmsg, &filter_info); |
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if (ret) |
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goto out; |
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handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS); |
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filter_info.kind = "clsact/ingress"; |
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ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle, |
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dump_filter_nlmsg, &filter_info); |
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if (ret) |
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goto out; |
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handle = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_EGRESS); |
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filter_info.kind = "clsact/egress"; |
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ret = netlink_get_filter(sock, nl_pid, dev->ifindex, handle, |
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dump_filter_nlmsg, &filter_info); |
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if (ret) |
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goto out; |
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out: |
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free(tcinfo.handle_array); |
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return 0; |
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} |
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static int query_flow_dissector(struct bpf_attach_info *attach_info) |
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{ |
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__u32 attach_flags; |
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__u32 prog_ids[1]; |
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__u32 prog_cnt; |
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int err; |
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int fd; |
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fd = open("/proc/self/ns/net", O_RDONLY); |
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if (fd < 0) { |
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p_err("can't open /proc/self/ns/net: %s", |
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strerror(errno)); |
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return -1; |
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} |
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prog_cnt = ARRAY_SIZE(prog_ids); |
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err = bpf_prog_query(fd, BPF_FLOW_DISSECTOR, 0, |
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&attach_flags, prog_ids, &prog_cnt); |
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close(fd); |
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if (err) { |
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if (errno == EINVAL) { |
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/* Older kernel's don't support querying |
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* flow dissector programs. |
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*/ |
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errno = 0; |
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return 0; |
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} |
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p_err("can't query prog: %s", strerror(errno)); |
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return -1; |
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} |
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|
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if (prog_cnt == 1) |
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attach_info->flow_dissector_id = prog_ids[0]; |
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return 0; |
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} |
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static int net_parse_dev(int *argc, char ***argv) |
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{ |
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int ifindex; |
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|
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if (is_prefix(**argv, "dev")) { |
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NEXT_ARGP(); |
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ifindex = if_nametoindex(**argv); |
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if (!ifindex) |
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p_err("invalid devname %s", **argv); |
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|
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NEXT_ARGP(); |
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} else { |
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p_err("expected 'dev', got: '%s'?", **argv); |
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return -1; |
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} |
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return ifindex; |
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} |
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static int do_attach_detach_xdp(int progfd, enum net_attach_type attach_type, |
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int ifindex, bool overwrite) |
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{ |
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__u32 flags = 0; |
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|
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if (!overwrite) |
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flags = XDP_FLAGS_UPDATE_IF_NOEXIST; |
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if (attach_type == NET_ATTACH_TYPE_XDP_GENERIC) |
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flags |= XDP_FLAGS_SKB_MODE; |
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if (attach_type == NET_ATTACH_TYPE_XDP_DRIVER) |
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flags |= XDP_FLAGS_DRV_MODE; |
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if (attach_type == NET_ATTACH_TYPE_XDP_OFFLOAD) |
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flags |= XDP_FLAGS_HW_MODE; |
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|
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return bpf_set_link_xdp_fd(ifindex, progfd, flags); |
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} |
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|
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static int do_attach(int argc, char **argv) |
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{ |
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enum net_attach_type attach_type; |
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int progfd, ifindex, err = 0; |
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bool overwrite = false; |
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|
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/* parse attach args */ |
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if (!REQ_ARGS(5)) |
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return -EINVAL; |
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|
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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" |
|
" " HELP_SPEC_OPTIONS " }\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); |
|
}
|
|
|