mirror of https://gitee.com/openkylin/linux.git
tools/bpftool: Remove libbpf_internal.h usage in bpftool
Most netlink-related functions were unique to bpftool usage, so I moved them into net.c. Few functions are still used by both bpftool and libbpf itself internally, so I've copy-pasted them (libbpf_nl_get_link, libbpf_netlink_open). It's a bit of duplication of code, but better separation of libbpf as a library with public API and bpftool, relying on unexposed functions in libbpf. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200819013607.3607269-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
Alexei Starovoitov
parent
029258d7b2
commit
7084566a23
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@ -19,11 +19,9 @@
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#include <sys/mman.h>
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#include <bpf/btf.h>
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#include "bpf/libbpf_internal.h"
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#include "json_writer.h"
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#include "main.h"
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#define MAX_OBJ_NAME_LEN 64
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static void sanitize_identifier(char *name)
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@ -6,22 +6,27 @@
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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/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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#include "bpf/nlattr.h"
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#include "bpf/libbpf_internal.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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@ -85,6 +90,266 @@ static enum net_attach_type parse_attach_type(const char *str)
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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, 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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@ -168,14 +433,14 @@ static int show_dev_tc_bpf(int sock, unsigned int nl_pid,
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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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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 = libbpf_nl_get_qdisc(sock, nl_pid, dev->ifindex,
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dump_class_qdisc_nlmsg, &tcinfo);
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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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@ -183,9 +448,9 @@ static int show_dev_tc_bpf(int sock, unsigned int nl_pid,
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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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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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@ -193,22 +458,22 @@ static int show_dev_tc_bpf(int sock, unsigned int nl_pid,
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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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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 = libbpf_nl_get_filter(sock, nl_pid, dev->ifindex, handle,
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dump_filter_nlmsg, &filter_info);
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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 = libbpf_nl_get_filter(sock, nl_pid, dev->ifindex, handle,
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dump_filter_nlmsg, &filter_info);
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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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@ -386,7 +651,7 @@ static int do_show(int argc, char **argv)
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struct bpf_attach_info attach_info = {};
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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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unsigned int nl_pid = 0;
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char err_buf[256];
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|
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if (argc == 2) {
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|
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@ -401,7 +666,7 @@ static int do_show(int argc, char **argv)
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if (ret)
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return -1;
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sock = libbpf_netlink_open(&nl_pid);
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sock = 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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@ -416,7 +681,7 @@ static int do_show(int argc, char **argv)
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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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ret = netlink_get_link(sock, nl_pid, dump_link_nlmsg, &dev_array);
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NET_END_ARRAY("\n");
|
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|
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if (!ret) {
|
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|
|
|
|||
|
|
@ -130,18 +130,6 @@ int bpf_object__section_size(const struct bpf_object *obj, const char *name,
|
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int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
|
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__u32 *off);
|
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|
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struct nlattr;
|
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typedef int (*libbpf_dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
|
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int libbpf_netlink_open(unsigned int *nl_pid);
|
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int libbpf_nl_get_link(int sock, unsigned int nl_pid,
|
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libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie);
|
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int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
|
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libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie);
|
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int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
|
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libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie);
|
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int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
|
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libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie);
|
||||
|
||||
struct btf_ext_info {
|
||||
/*
|
||||
* info points to the individual info section (e.g. func_info and
|
||||
|
|
|
|||
|
|
@ -22,6 +22,8 @@
|
|||
#define SOL_NETLINK 270
|
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#endif
|
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|
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typedef int (*libbpf_dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
|
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|
||||
typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, libbpf_dump_nlmsg_t,
|
||||
void *cookie);
|
||||
|
||||
|
|
@ -31,7 +33,7 @@ struct xdp_id_md {
|
|||
struct xdp_link_info info;
|
||||
};
|
||||
|
||||
int libbpf_netlink_open(__u32 *nl_pid)
|
||||
static int libbpf_netlink_open(__u32 *nl_pid)
|
||||
{
|
||||
struct sockaddr_nl sa;
|
||||
socklen_t addrlen;
|
||||
|
|
@ -283,6 +285,9 @@ static int get_xdp_info(void *cookie, void *msg, struct nlattr **tb)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int libbpf_nl_get_link(int sock, unsigned int nl_pid,
|
||||
libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie);
|
||||
|
||||
int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
|
||||
size_t info_size, __u32 flags)
|
||||
{
|
||||
|
|
@ -368,121 +373,3 @@ int libbpf_nl_get_link(int sock, unsigned int nl_pid,
|
|||
return bpf_netlink_recv(sock, nl_pid, seq, __dump_link_nlmsg,
|
||||
dump_link_nlmsg, cookie);
|
||||
}
|
||||
|
||||
static int __dump_class_nlmsg(struct nlmsghdr *nlh,
|
||||
libbpf_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);
|
||||
}
|
||||
|
||||
int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
|
||||
libbpf_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 bpf_netlink_recv(sock, nl_pid, seq, __dump_class_nlmsg,
|
||||
dump_class_nlmsg, cookie);
|
||||
}
|
||||
|
||||
static int __dump_qdisc_nlmsg(struct nlmsghdr *nlh,
|
||||
libbpf_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);
|
||||
}
|
||||
|
||||
int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
|
||||
libbpf_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 bpf_netlink_recv(sock, nl_pid, seq, __dump_qdisc_nlmsg,
|
||||
dump_qdisc_nlmsg, cookie);
|
||||
}
|
||||
|
||||
static int __dump_filter_nlmsg(struct nlmsghdr *nlh,
|
||||
libbpf_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);
|
||||
}
|
||||
|
||||
int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
|
||||
libbpf_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 bpf_netlink_recv(sock, nl_pid, seq, __dump_filter_nlmsg,
|
||||
dump_filter_nlmsg, cookie);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue