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958 lines
18 KiB
958 lines
18 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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/* Copyright (C) 2017-2018 Netronome Systems, Inc. */ |
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#define _GNU_SOURCE |
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#include <ctype.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <ftw.h> |
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#include <libgen.h> |
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#include <mntent.h> |
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#include <stdbool.h> |
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#include <stdio.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 <linux/limits.h> |
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#include <linux/magic.h> |
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#include <net/if.h> |
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#include <sys/mount.h> |
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#include <sys/resource.h> |
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#include <sys/stat.h> |
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#include <sys/vfs.h> |
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|
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> /* libbpf_num_possible_cpus */ |
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#include "main.h" |
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#ifndef BPF_FS_MAGIC |
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#define BPF_FS_MAGIC 0xcafe4a11 |
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#endif |
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const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = { |
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[BPF_CGROUP_INET_INGRESS] = "ingress", |
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[BPF_CGROUP_INET_EGRESS] = "egress", |
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[BPF_CGROUP_INET_SOCK_CREATE] = "sock_create", |
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[BPF_CGROUP_INET_SOCK_RELEASE] = "sock_release", |
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[BPF_CGROUP_SOCK_OPS] = "sock_ops", |
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[BPF_CGROUP_DEVICE] = "device", |
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[BPF_CGROUP_INET4_BIND] = "bind4", |
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[BPF_CGROUP_INET6_BIND] = "bind6", |
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[BPF_CGROUP_INET4_CONNECT] = "connect4", |
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[BPF_CGROUP_INET6_CONNECT] = "connect6", |
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[BPF_CGROUP_INET4_POST_BIND] = "post_bind4", |
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[BPF_CGROUP_INET6_POST_BIND] = "post_bind6", |
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[BPF_CGROUP_INET4_GETPEERNAME] = "getpeername4", |
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[BPF_CGROUP_INET6_GETPEERNAME] = "getpeername6", |
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[BPF_CGROUP_INET4_GETSOCKNAME] = "getsockname4", |
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[BPF_CGROUP_INET6_GETSOCKNAME] = "getsockname6", |
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[BPF_CGROUP_UDP4_SENDMSG] = "sendmsg4", |
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[BPF_CGROUP_UDP6_SENDMSG] = "sendmsg6", |
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[BPF_CGROUP_SYSCTL] = "sysctl", |
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[BPF_CGROUP_UDP4_RECVMSG] = "recvmsg4", |
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[BPF_CGROUP_UDP6_RECVMSG] = "recvmsg6", |
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[BPF_CGROUP_GETSOCKOPT] = "getsockopt", |
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[BPF_CGROUP_SETSOCKOPT] = "setsockopt", |
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[BPF_SK_SKB_STREAM_PARSER] = "sk_skb_stream_parser", |
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[BPF_SK_SKB_STREAM_VERDICT] = "sk_skb_stream_verdict", |
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[BPF_SK_SKB_VERDICT] = "sk_skb_verdict", |
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[BPF_SK_MSG_VERDICT] = "sk_msg_verdict", |
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[BPF_LIRC_MODE2] = "lirc_mode2", |
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[BPF_FLOW_DISSECTOR] = "flow_dissector", |
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[BPF_TRACE_RAW_TP] = "raw_tp", |
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[BPF_TRACE_FENTRY] = "fentry", |
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[BPF_TRACE_FEXIT] = "fexit", |
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[BPF_MODIFY_RETURN] = "mod_ret", |
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[BPF_LSM_MAC] = "lsm_mac", |
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[BPF_SK_LOOKUP] = "sk_lookup", |
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}; |
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void p_err(const char *fmt, ...) |
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{ |
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va_list ap; |
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va_start(ap, fmt); |
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if (json_output) { |
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jsonw_start_object(json_wtr); |
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jsonw_name(json_wtr, "error"); |
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jsonw_vprintf_enquote(json_wtr, fmt, ap); |
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jsonw_end_object(json_wtr); |
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} else { |
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fprintf(stderr, "Error: "); |
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vfprintf(stderr, fmt, ap); |
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fprintf(stderr, "\n"); |
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} |
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va_end(ap); |
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} |
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void p_info(const char *fmt, ...) |
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{ |
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va_list ap; |
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if (json_output) |
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return; |
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va_start(ap, fmt); |
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vfprintf(stderr, fmt, ap); |
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fprintf(stderr, "\n"); |
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va_end(ap); |
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} |
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static bool is_bpffs(char *path) |
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{ |
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struct statfs st_fs; |
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if (statfs(path, &st_fs) < 0) |
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return false; |
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return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; |
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} |
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void set_max_rlimit(void) |
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{ |
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struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; |
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setrlimit(RLIMIT_MEMLOCK, &rinf); |
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} |
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static int |
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mnt_fs(const char *target, const char *type, char *buff, size_t bufflen) |
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{ |
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bool bind_done = false; |
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while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { |
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if (errno != EINVAL || bind_done) { |
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snprintf(buff, bufflen, |
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"mount --make-private %s failed: %s", |
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target, strerror(errno)); |
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return -1; |
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} |
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if (mount(target, target, "none", MS_BIND, NULL)) { |
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snprintf(buff, bufflen, |
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"mount --bind %s %s failed: %s", |
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target, target, strerror(errno)); |
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return -1; |
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} |
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bind_done = true; |
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} |
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if (mount(type, target, type, 0, "mode=0700")) { |
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snprintf(buff, bufflen, "mount -t %s %s %s failed: %s", |
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type, type, target, strerror(errno)); |
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return -1; |
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} |
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return 0; |
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} |
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int mount_tracefs(const char *target) |
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{ |
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char err_str[ERR_MAX_LEN]; |
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int err; |
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err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN); |
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if (err) { |
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err_str[ERR_MAX_LEN - 1] = '\0'; |
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p_err("can't mount tracefs: %s", err_str); |
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} |
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return err; |
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} |
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int open_obj_pinned(const char *path, bool quiet) |
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{ |
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char *pname; |
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int fd = -1; |
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pname = strdup(path); |
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if (!pname) { |
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if (!quiet) |
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p_err("mem alloc failed"); |
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goto out_ret; |
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} |
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fd = bpf_obj_get(pname); |
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if (fd < 0) { |
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if (!quiet) |
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p_err("bpf obj get (%s): %s", pname, |
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errno == EACCES && !is_bpffs(dirname(pname)) ? |
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"directory not in bpf file system (bpffs)" : |
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strerror(errno)); |
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goto out_free; |
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} |
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out_free: |
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free(pname); |
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out_ret: |
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return fd; |
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} |
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int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) |
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{ |
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enum bpf_obj_type type; |
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int fd; |
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fd = open_obj_pinned(path, false); |
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if (fd < 0) |
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return -1; |
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type = get_fd_type(fd); |
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if (type < 0) { |
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close(fd); |
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return type; |
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} |
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if (type != exp_type) { |
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p_err("incorrect object type: %s", get_fd_type_name(type)); |
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close(fd); |
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return -1; |
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} |
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return fd; |
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} |
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int mount_bpffs_for_pin(const char *name) |
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{ |
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char err_str[ERR_MAX_LEN]; |
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char *file; |
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char *dir; |
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int err = 0; |
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file = malloc(strlen(name) + 1); |
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if (!file) { |
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p_err("mem alloc failed"); |
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return -1; |
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} |
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strcpy(file, name); |
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dir = dirname(file); |
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if (is_bpffs(dir)) |
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/* nothing to do if already mounted */ |
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goto out_free; |
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if (block_mount) { |
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p_err("no BPF file system found, not mounting it due to --nomount option"); |
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err = -1; |
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goto out_free; |
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} |
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err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); |
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if (err) { |
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err_str[ERR_MAX_LEN - 1] = '\0'; |
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p_err("can't mount BPF file system to pin the object (%s): %s", |
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name, err_str); |
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} |
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out_free: |
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free(file); |
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return err; |
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} |
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int do_pin_fd(int fd, const char *name) |
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{ |
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int err; |
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err = mount_bpffs_for_pin(name); |
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if (err) |
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return err; |
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err = bpf_obj_pin(fd, name); |
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if (err) |
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p_err("can't pin the object (%s): %s", name, strerror(errno)); |
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return err; |
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} |
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int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) |
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{ |
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int err; |
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int fd; |
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fd = get_fd(&argc, &argv); |
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if (fd < 0) |
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return fd; |
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err = do_pin_fd(fd, *argv); |
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close(fd); |
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return err; |
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} |
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const char *get_fd_type_name(enum bpf_obj_type type) |
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{ |
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static const char * const names[] = { |
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[BPF_OBJ_UNKNOWN] = "unknown", |
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[BPF_OBJ_PROG] = "prog", |
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[BPF_OBJ_MAP] = "map", |
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}; |
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if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) |
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return names[BPF_OBJ_UNKNOWN]; |
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return names[type]; |
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} |
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int get_fd_type(int fd) |
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{ |
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char path[PATH_MAX]; |
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char buf[512]; |
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ssize_t n; |
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snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); |
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n = readlink(path, buf, sizeof(buf)); |
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if (n < 0) { |
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p_err("can't read link type: %s", strerror(errno)); |
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return -1; |
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} |
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if (n == sizeof(path)) { |
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p_err("can't read link type: path too long!"); |
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return -1; |
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} |
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if (strstr(buf, "bpf-map")) |
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return BPF_OBJ_MAP; |
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else if (strstr(buf, "bpf-prog")) |
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return BPF_OBJ_PROG; |
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else if (strstr(buf, "bpf-link")) |
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return BPF_OBJ_LINK; |
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return BPF_OBJ_UNKNOWN; |
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} |
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char *get_fdinfo(int fd, const char *key) |
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{ |
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char path[PATH_MAX]; |
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char *line = NULL; |
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size_t line_n = 0; |
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ssize_t n; |
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FILE *fdi; |
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snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); |
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fdi = fopen(path, "r"); |
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if (!fdi) |
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return NULL; |
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while ((n = getline(&line, &line_n, fdi)) > 0) { |
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char *value; |
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int len; |
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if (!strstr(line, key)) |
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continue; |
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fclose(fdi); |
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value = strchr(line, '\t'); |
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if (!value || !value[1]) { |
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free(line); |
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return NULL; |
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} |
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value++; |
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len = strlen(value); |
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memmove(line, value, len); |
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line[len - 1] = '\0'; |
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return line; |
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} |
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free(line); |
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fclose(fdi); |
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return NULL; |
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} |
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void print_data_json(uint8_t *data, size_t len) |
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{ |
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unsigned int i; |
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jsonw_start_array(json_wtr); |
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for (i = 0; i < len; i++) |
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jsonw_printf(json_wtr, "%d", data[i]); |
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jsonw_end_array(json_wtr); |
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} |
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void print_hex_data_json(uint8_t *data, size_t len) |
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{ |
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unsigned int i; |
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jsonw_start_array(json_wtr); |
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for (i = 0; i < len; i++) |
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jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); |
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jsonw_end_array(json_wtr); |
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} |
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/* extra params for nftw cb */ |
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static struct pinned_obj_table *build_fn_table; |
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static enum bpf_obj_type build_fn_type; |
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static int do_build_table_cb(const char *fpath, const struct stat *sb, |
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int typeflag, struct FTW *ftwbuf) |
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{ |
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struct bpf_prog_info pinned_info; |
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__u32 len = sizeof(pinned_info); |
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struct pinned_obj *obj_node; |
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enum bpf_obj_type objtype; |
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int fd, err = 0; |
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if (typeflag != FTW_F) |
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goto out_ret; |
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fd = open_obj_pinned(fpath, true); |
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if (fd < 0) |
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goto out_ret; |
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objtype = get_fd_type(fd); |
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if (objtype != build_fn_type) |
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goto out_close; |
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memset(&pinned_info, 0, sizeof(pinned_info)); |
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if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len)) |
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goto out_close; |
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obj_node = calloc(1, sizeof(*obj_node)); |
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if (!obj_node) { |
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err = -1; |
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goto out_close; |
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} |
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obj_node->id = pinned_info.id; |
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obj_node->path = strdup(fpath); |
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if (!obj_node->path) { |
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err = -1; |
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free(obj_node); |
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goto out_close; |
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} |
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hash_add(build_fn_table->table, &obj_node->hash, obj_node->id); |
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out_close: |
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close(fd); |
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out_ret: |
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return err; |
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} |
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int build_pinned_obj_table(struct pinned_obj_table *tab, |
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enum bpf_obj_type type) |
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{ |
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struct mntent *mntent = NULL; |
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FILE *mntfile = NULL; |
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int flags = FTW_PHYS; |
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int nopenfd = 16; |
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int err = 0; |
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mntfile = setmntent("/proc/mounts", "r"); |
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if (!mntfile) |
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return -1; |
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build_fn_table = tab; |
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build_fn_type = type; |
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while ((mntent = getmntent(mntfile))) { |
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char *path = mntent->mnt_dir; |
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if (strncmp(mntent->mnt_type, "bpf", 3) != 0) |
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continue; |
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err = nftw(path, do_build_table_cb, nopenfd, flags); |
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if (err) |
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break; |
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} |
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fclose(mntfile); |
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return err; |
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} |
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void delete_pinned_obj_table(struct pinned_obj_table *tab) |
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{ |
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struct pinned_obj *obj; |
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struct hlist_node *tmp; |
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unsigned int bkt; |
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hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { |
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hash_del(&obj->hash); |
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free(obj->path); |
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free(obj); |
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} |
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} |
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unsigned int get_page_size(void) |
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{ |
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static int result; |
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if (!result) |
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result = getpagesize(); |
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return result; |
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} |
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unsigned int get_possible_cpus(void) |
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{ |
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int cpus = libbpf_num_possible_cpus(); |
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if (cpus < 0) { |
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p_err("Can't get # of possible cpus: %s", strerror(-cpus)); |
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exit(-1); |
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} |
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return cpus; |
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} |
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static char * |
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ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) |
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{ |
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struct stat st; |
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int err; |
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err = stat("/proc/self/ns/net", &st); |
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if (err) { |
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p_err("Can't stat /proc/self: %s", strerror(errno)); |
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return NULL; |
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} |
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if (st.st_dev != ns_dev || st.st_ino != ns_ino) |
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return NULL; |
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return if_indextoname(ifindex, buf); |
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} |
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static int read_sysfs_hex_int(char *path) |
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{ |
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char vendor_id_buf[8]; |
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int len; |
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int fd; |
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fd = open(path, O_RDONLY); |
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if (fd < 0) { |
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p_err("Can't open %s: %s", path, strerror(errno)); |
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return -1; |
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} |
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len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); |
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close(fd); |
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if (len < 0) { |
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p_err("Can't read %s: %s", path, strerror(errno)); |
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return -1; |
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} |
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if (len >= (int)sizeof(vendor_id_buf)) { |
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p_err("Value in %s too long", path); |
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return -1; |
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} |
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vendor_id_buf[len] = 0; |
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return strtol(vendor_id_buf, NULL, 0); |
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} |
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static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) |
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{ |
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char full_path[64]; |
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snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", |
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devname, entry_name); |
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return read_sysfs_hex_int(full_path); |
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} |
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const char * |
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ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, |
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const char **opt) |
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{ |
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char devname[IF_NAMESIZE]; |
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int vendor_id; |
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int device_id; |
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if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { |
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p_err("Can't get net device name for ifindex %d: %s", ifindex, |
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strerror(errno)); |
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return NULL; |
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} |
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vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); |
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if (vendor_id < 0) { |
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p_err("Can't get device vendor id for %s", devname); |
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return NULL; |
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} |
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switch (vendor_id) { |
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case 0x19ee: |
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device_id = read_sysfs_netdev_hex_int(devname, "device"); |
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if (device_id != 0x4000 && |
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device_id != 0x6000 && |
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device_id != 0x6003) |
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p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); |
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*opt = "ctx4"; |
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return "NFP-6xxx"; |
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default: |
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p_err("Can't get bfd arch name for device vendor id 0x%04x", |
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vendor_id); |
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return NULL; |
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} |
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} |
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void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) |
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{ |
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char name[IF_NAMESIZE]; |
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|
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if (!ifindex) |
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return; |
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printf(" offloaded_to "); |
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if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) |
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printf("%s", name); |
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else |
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printf("ifindex %u ns_dev %llu ns_ino %llu", |
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ifindex, ns_dev, ns_inode); |
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} |
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void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) |
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{ |
|
char name[IF_NAMESIZE]; |
|
|
|
if (!ifindex) |
|
return; |
|
|
|
jsonw_name(json_wtr, "dev"); |
|
jsonw_start_object(json_wtr); |
|
jsonw_uint_field(json_wtr, "ifindex", ifindex); |
|
jsonw_uint_field(json_wtr, "ns_dev", ns_dev); |
|
jsonw_uint_field(json_wtr, "ns_inode", ns_inode); |
|
if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) |
|
jsonw_string_field(json_wtr, "ifname", name); |
|
jsonw_end_object(json_wtr); |
|
} |
|
|
|
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) |
|
{ |
|
char *endptr; |
|
|
|
NEXT_ARGP(); |
|
|
|
if (*val) { |
|
p_err("%s already specified", what); |
|
return -1; |
|
} |
|
|
|
*val = strtoul(**argv, &endptr, 0); |
|
if (*endptr) { |
|
p_err("can't parse %s as %s", **argv, what); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
return 0; |
|
} |
|
|
|
int __printf(2, 0) |
|
print_all_levels(__maybe_unused enum libbpf_print_level level, |
|
const char *format, va_list args) |
|
{ |
|
return vfprintf(stderr, format, args); |
|
} |
|
|
|
static int prog_fd_by_nametag(void *nametag, int **fds, bool tag) |
|
{ |
|
unsigned int id = 0; |
|
int fd, nb_fds = 0; |
|
void *tmp; |
|
int err; |
|
|
|
while (true) { |
|
struct bpf_prog_info info = {}; |
|
__u32 len = sizeof(info); |
|
|
|
err = bpf_prog_get_next_id(id, &id); |
|
if (err) { |
|
if (errno != ENOENT) { |
|
p_err("%s", strerror(errno)); |
|
goto err_close_fds; |
|
} |
|
return nb_fds; |
|
} |
|
|
|
fd = bpf_prog_get_fd_by_id(id); |
|
if (fd < 0) { |
|
p_err("can't get prog by id (%u): %s", |
|
id, strerror(errno)); |
|
goto err_close_fds; |
|
} |
|
|
|
err = bpf_obj_get_info_by_fd(fd, &info, &len); |
|
if (err) { |
|
p_err("can't get prog info (%u): %s", |
|
id, strerror(errno)); |
|
goto err_close_fd; |
|
} |
|
|
|
if ((tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) || |
|
(!tag && strncmp(nametag, info.name, BPF_OBJ_NAME_LEN))) { |
|
close(fd); |
|
continue; |
|
} |
|
|
|
if (nb_fds > 0) { |
|
tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); |
|
if (!tmp) { |
|
p_err("failed to realloc"); |
|
goto err_close_fd; |
|
} |
|
*fds = tmp; |
|
} |
|
(*fds)[nb_fds++] = fd; |
|
} |
|
|
|
err_close_fd: |
|
close(fd); |
|
err_close_fds: |
|
while (--nb_fds >= 0) |
|
close((*fds)[nb_fds]); |
|
return -1; |
|
} |
|
|
|
int prog_parse_fds(int *argc, char ***argv, int **fds) |
|
{ |
|
if (is_prefix(**argv, "id")) { |
|
unsigned int id; |
|
char *endptr; |
|
|
|
NEXT_ARGP(); |
|
|
|
id = strtoul(**argv, &endptr, 0); |
|
if (*endptr) { |
|
p_err("can't parse %s as ID", **argv); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
(*fds)[0] = bpf_prog_get_fd_by_id(id); |
|
if ((*fds)[0] < 0) { |
|
p_err("get by id (%u): %s", id, strerror(errno)); |
|
return -1; |
|
} |
|
return 1; |
|
} else if (is_prefix(**argv, "tag")) { |
|
unsigned char tag[BPF_TAG_SIZE]; |
|
|
|
NEXT_ARGP(); |
|
|
|
if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2, |
|
tag + 3, tag + 4, tag + 5, tag + 6, tag + 7) |
|
!= BPF_TAG_SIZE) { |
|
p_err("can't parse tag"); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
return prog_fd_by_nametag(tag, fds, true); |
|
} else if (is_prefix(**argv, "name")) { |
|
char *name; |
|
|
|
NEXT_ARGP(); |
|
|
|
name = **argv; |
|
if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { |
|
p_err("can't parse name"); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
return prog_fd_by_nametag(name, fds, false); |
|
} else if (is_prefix(**argv, "pinned")) { |
|
char *path; |
|
|
|
NEXT_ARGP(); |
|
|
|
path = **argv; |
|
NEXT_ARGP(); |
|
|
|
(*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG); |
|
if ((*fds)[0] < 0) |
|
return -1; |
|
return 1; |
|
} |
|
|
|
p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv); |
|
return -1; |
|
} |
|
|
|
int prog_parse_fd(int *argc, char ***argv) |
|
{ |
|
int *fds = NULL; |
|
int nb_fds, fd; |
|
|
|
fds = malloc(sizeof(int)); |
|
if (!fds) { |
|
p_err("mem alloc failed"); |
|
return -1; |
|
} |
|
nb_fds = prog_parse_fds(argc, argv, &fds); |
|
if (nb_fds != 1) { |
|
if (nb_fds > 1) { |
|
p_err("several programs match this handle"); |
|
while (nb_fds--) |
|
close(fds[nb_fds]); |
|
} |
|
fd = -1; |
|
goto exit_free; |
|
} |
|
|
|
fd = fds[0]; |
|
exit_free: |
|
free(fds); |
|
return fd; |
|
} |
|
|
|
static int map_fd_by_name(char *name, int **fds) |
|
{ |
|
unsigned int id = 0; |
|
int fd, nb_fds = 0; |
|
void *tmp; |
|
int err; |
|
|
|
while (true) { |
|
struct bpf_map_info info = {}; |
|
__u32 len = sizeof(info); |
|
|
|
err = bpf_map_get_next_id(id, &id); |
|
if (err) { |
|
if (errno != ENOENT) { |
|
p_err("%s", strerror(errno)); |
|
goto err_close_fds; |
|
} |
|
return nb_fds; |
|
} |
|
|
|
fd = bpf_map_get_fd_by_id(id); |
|
if (fd < 0) { |
|
p_err("can't get map by id (%u): %s", |
|
id, strerror(errno)); |
|
goto err_close_fds; |
|
} |
|
|
|
err = bpf_obj_get_info_by_fd(fd, &info, &len); |
|
if (err) { |
|
p_err("can't get map info (%u): %s", |
|
id, strerror(errno)); |
|
goto err_close_fd; |
|
} |
|
|
|
if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) { |
|
close(fd); |
|
continue; |
|
} |
|
|
|
if (nb_fds > 0) { |
|
tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); |
|
if (!tmp) { |
|
p_err("failed to realloc"); |
|
goto err_close_fd; |
|
} |
|
*fds = tmp; |
|
} |
|
(*fds)[nb_fds++] = fd; |
|
} |
|
|
|
err_close_fd: |
|
close(fd); |
|
err_close_fds: |
|
while (--nb_fds >= 0) |
|
close((*fds)[nb_fds]); |
|
return -1; |
|
} |
|
|
|
int map_parse_fds(int *argc, char ***argv, int **fds) |
|
{ |
|
if (is_prefix(**argv, "id")) { |
|
unsigned int id; |
|
char *endptr; |
|
|
|
NEXT_ARGP(); |
|
|
|
id = strtoul(**argv, &endptr, 0); |
|
if (*endptr) { |
|
p_err("can't parse %s as ID", **argv); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
(*fds)[0] = bpf_map_get_fd_by_id(id); |
|
if ((*fds)[0] < 0) { |
|
p_err("get map by id (%u): %s", id, strerror(errno)); |
|
return -1; |
|
} |
|
return 1; |
|
} else if (is_prefix(**argv, "name")) { |
|
char *name; |
|
|
|
NEXT_ARGP(); |
|
|
|
name = **argv; |
|
if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { |
|
p_err("can't parse name"); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
return map_fd_by_name(name, fds); |
|
} else if (is_prefix(**argv, "pinned")) { |
|
char *path; |
|
|
|
NEXT_ARGP(); |
|
|
|
path = **argv; |
|
NEXT_ARGP(); |
|
|
|
(*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP); |
|
if ((*fds)[0] < 0) |
|
return -1; |
|
return 1; |
|
} |
|
|
|
p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv); |
|
return -1; |
|
} |
|
|
|
int map_parse_fd(int *argc, char ***argv) |
|
{ |
|
int *fds = NULL; |
|
int nb_fds, fd; |
|
|
|
fds = malloc(sizeof(int)); |
|
if (!fds) { |
|
p_err("mem alloc failed"); |
|
return -1; |
|
} |
|
nb_fds = map_parse_fds(argc, argv, &fds); |
|
if (nb_fds != 1) { |
|
if (nb_fds > 1) { |
|
p_err("several maps match this handle"); |
|
while (nb_fds--) |
|
close(fds[nb_fds]); |
|
} |
|
fd = -1; |
|
goto exit_free; |
|
} |
|
|
|
fd = fds[0]; |
|
exit_free: |
|
free(fds); |
|
return fd; |
|
} |
|
|
|
int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len) |
|
{ |
|
int err; |
|
int fd; |
|
|
|
fd = map_parse_fd(argc, argv); |
|
if (fd < 0) |
|
return -1; |
|
|
|
err = bpf_obj_get_info_by_fd(fd, info, info_len); |
|
if (err) { |
|
p_err("can't get map info: %s", strerror(errno)); |
|
close(fd); |
|
return err; |
|
} |
|
|
|
return fd; |
|
}
|
|
|