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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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aae5778010
libbpf is used more and more outside kernel tree. That means the library should follow good practices in library design and implementation to play well with third party code that uses it. One of such practices is to have a common prefix (or a few) for every interface, function or data structure, library provides. I helps to avoid name conflicts with other libraries and keeps API consistent. Inconsistent names in libbpf already cause problems in real life. E.g. an application can't use both libbpf and libnl due to conflicting symbols. Having common prefix will help to fix current and avoid future problems. libbpf already uses the following prefixes for its interfaces: * bpf_ for bpf system call wrappers, program/map/elf-object abstractions and a few other things; * btf_ for BTF related API; * libbpf_ for everything else. The patch adds libbpf_ prefix to functions and typedef in libbpf.h that use none of mentioned above prefixes and doesn't fit well into the first two categories. Since affected part of API is used in bpftool, the patch applies corresponding change to bpftool as well. Having it in a separate patch will cause a state of tree where bpftool is broken what may not be a good idea. Signed-off-by: Andrey Ignatov <rdna@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
271 lines
6.2 KiB
C
271 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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 <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libbpf.h>
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#include <net/if.h>
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#include <linux/if.h>
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#include <linux/rtnetlink.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 <bpf.h>
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#include <nlattr.h>
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#include "main.h"
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#include "netlink_dumper.h"
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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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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] ? nla_getattr_str(tb[IFLA_IFNAME]) : "");
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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(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] ? nla_getattr_str(tb[TCA_KIND]) : "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 = libbpf_nl_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 = libbpf_nl_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 = libbpf_nl_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 = libbpf_nl_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 = libbpf_nl_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 = libbpf_nl_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 do_show(int argc, char **argv)
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{
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int i, sock, ret, filter_idx = -1;
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struct bpf_netdev_t dev_array;
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unsigned int nl_pid;
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char err_buf[256];
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if (argc == 2) {
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if (strcmp(argv[0], "dev") != 0)
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usage();
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filter_idx = if_nametoindex(argv[1]);
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if (filter_idx == 0) {
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fprintf(stderr, "invalid dev name %s\n", argv[1]);
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return -1;
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}
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} else if (argc != 0) {
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usage();
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}
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sock = libbpf_netlink_open(&nl_pid);
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if (sock < 0) {
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fprintf(stderr, "failed to open netlink sock\n");
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return -1;
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}
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dev_array.devices = NULL;
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dev_array.used_len = 0;
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dev_array.array_len = 0;
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dev_array.filter_idx = filter_idx;
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if (json_output)
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jsonw_start_array(json_wtr);
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NET_START_OBJECT;
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NET_START_ARRAY("xdp", "%s:\n");
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ret = libbpf_nl_get_link(sock, nl_pid, dump_link_nlmsg, &dev_array);
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NET_END_ARRAY("\n");
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if (!ret) {
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NET_START_ARRAY("tc", "%s:\n");
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for (i = 0; i < dev_array.used_len; i++) {
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ret = show_dev_tc_bpf(sock, nl_pid,
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&dev_array.devices[i]);
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if (ret)
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break;
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}
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NET_END_ARRAY("\n");
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}
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NET_END_OBJECT;
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if (json_output)
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jsonw_end_array(json_wtr);
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if (ret) {
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if (json_output)
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jsonw_null(json_wtr);
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libbpf_strerror(ret, err_buf, sizeof(err_buf));
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fprintf(stderr, "Error: %s\n", err_buf);
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}
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free(dev_array.devices);
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close(sock);
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return ret;
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}
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static int do_help(int argc, char **argv)
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{
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if (json_output) {
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jsonw_null(json_wtr);
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return 0;
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}
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fprintf(stderr,
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"Usage: %s %s { show | list } [dev <devname>]\n"
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" %s %s help\n"
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"Note: Only xdp and tc attachments are supported now.\n"
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" For progs attached to cgroups, use \"bpftool cgroup\"\n"
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" to dump program attachments. For program types\n"
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" sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
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" consult iproute2.\n",
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bin_name, argv[-2], bin_name, argv[-2]);
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return 0;
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}
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static const struct cmd cmds[] = {
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{ "show", do_show },
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{ "list", do_show },
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{ "help", do_help },
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{ 0 }
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};
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int do_net(int argc, char **argv)
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{
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return cmd_select(cmds, argc, argv, do_help);
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}
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