Jakub Kicinski | 02ff58d | 2018-12-12 19:59:25 -0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 3 | |
Quentin Monnet | b3d84af | 2022-10-25 16:03:22 +0100 | [diff] [blame] | 4 | #ifndef _GNU_SOURCE |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 5 | #define _GNU_SOURCE |
Quentin Monnet | b3d84af | 2022-10-25 16:03:22 +0100 | [diff] [blame] | 6 | #endif |
Jakub Kicinski | e64d525 | 2018-05-03 18:37:15 -0700 | [diff] [blame] | 7 | #include <ctype.h> |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 8 | #include <errno.h> |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 9 | #include <fcntl.h> |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 10 | #include <ftw.h> |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 11 | #include <libgen.h> |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 12 | #include <mntent.h> |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 13 | #include <stdbool.h> |
| 14 | #include <stdio.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | #include <unistd.h> |
Jakub Kicinski | 5226221 | 2017-12-27 18:39:10 -0800 | [diff] [blame] | 18 | #include <net/if.h> |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 19 | #include <sys/mount.h> |
Quentin Monnet | 6b4384f | 2022-06-10 12:26:47 +0100 | [diff] [blame] | 20 | #include <sys/resource.h> |
Jakub Kicinski | 5226221 | 2017-12-27 18:39:10 -0800 | [diff] [blame] | 21 | #include <sys/stat.h> |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 22 | #include <sys/vfs.h> |
| 23 | |
Quentin Monnet | f0cf642 | 2022-06-29 12:13:51 +0100 | [diff] [blame] | 24 | #include <linux/filter.h> |
| 25 | #include <linux/limits.h> |
| 26 | #include <linux/magic.h> |
| 27 | #include <linux/unistd.h> |
| 28 | |
Toke Høiland-Jørgensen | 229c3b4 | 2020-01-20 14:06:46 +0100 | [diff] [blame] | 29 | #include <bpf/bpf.h> |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 30 | #include <bpf/hashmap.h> |
Toke Høiland-Jørgensen | 229c3b4 | 2020-01-20 14:06:46 +0100 | [diff] [blame] | 31 | #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */ |
Raman Shukhau | b662000 | 2022-01-19 02:02:55 -0800 | [diff] [blame] | 32 | #include <bpf/btf.h> |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 33 | |
| 34 | #include "main.h" |
| 35 | |
Jiri Benc | 20d5de5 | 2018-03-06 14:50:10 +0100 | [diff] [blame] | 36 | #ifndef BPF_FS_MAGIC |
| 37 | #define BPF_FS_MAGIC 0xcafe4a11 |
| 38 | #endif |
| 39 | |
Quentin Monnet | 8918dc4 | 2019-08-15 15:32:20 +0100 | [diff] [blame] | 40 | void p_err(const char *fmt, ...) |
Quentin Monnet | 0b1c27d | 2017-11-03 13:59:07 -0700 | [diff] [blame] | 41 | { |
| 42 | va_list ap; |
| 43 | |
| 44 | va_start(ap, fmt); |
| 45 | if (json_output) { |
| 46 | jsonw_start_object(json_wtr); |
| 47 | jsonw_name(json_wtr, "error"); |
| 48 | jsonw_vprintf_enquote(json_wtr, fmt, ap); |
| 49 | jsonw_end_object(json_wtr); |
| 50 | } else { |
| 51 | fprintf(stderr, "Error: "); |
| 52 | vfprintf(stderr, fmt, ap); |
| 53 | fprintf(stderr, "\n"); |
| 54 | } |
| 55 | va_end(ap); |
| 56 | } |
| 57 | |
Quentin Monnet | 8918dc4 | 2019-08-15 15:32:20 +0100 | [diff] [blame] | 58 | void p_info(const char *fmt, ...) |
Quentin Monnet | 0b1c27d | 2017-11-03 13:59:07 -0700 | [diff] [blame] | 59 | { |
| 60 | va_list ap; |
| 61 | |
| 62 | if (json_output) |
| 63 | return; |
| 64 | |
| 65 | va_start(ap, fmt); |
| 66 | vfprintf(stderr, fmt, ap); |
| 67 | fprintf(stderr, "\n"); |
| 68 | va_end(ap); |
| 69 | } |
| 70 | |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 71 | static bool is_bpffs(char *path) |
| 72 | { |
| 73 | struct statfs st_fs; |
| 74 | |
| 75 | if (statfs(path, &st_fs) < 0) |
| 76 | return false; |
| 77 | |
| 78 | return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; |
| 79 | } |
| 80 | |
Quentin Monnet | f0cf642 | 2022-06-29 12:13:51 +0100 | [diff] [blame] | 81 | /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to |
| 82 | * memcg-based memory accounting for BPF maps and programs. This was done in |
| 83 | * commit 97306be45fbe ("Merge branch 'switch to memcg-based memory |
| 84 | * accounting'"), in Linux 5.11. |
| 85 | * |
| 86 | * Libbpf also offers to probe for memcg-based accounting vs rlimit, but does |
| 87 | * so by checking for the availability of a given BPF helper and this has |
| 88 | * failed on some kernels with backports in the past, see commit 6b4384ff1088 |
| 89 | * ("Revert "bpftool: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK""). |
| 90 | * Instead, we can probe by lowering the process-based rlimit to 0, trying to |
| 91 | * load a BPF object, and resetting the rlimit. If the load succeeds then |
| 92 | * memcg-based accounting is supported. |
| 93 | * |
| 94 | * This would be too dangerous to do in the library, because multithreaded |
| 95 | * applications might attempt to load items while the rlimit is at 0. Given |
| 96 | * that bpftool is single-threaded, this is fine to do here. |
| 97 | */ |
| 98 | static bool known_to_need_rlimit(void) |
| 99 | { |
| 100 | struct rlimit rlim_init, rlim_cur_zero = {}; |
| 101 | struct bpf_insn insns[] = { |
| 102 | BPF_MOV64_IMM(BPF_REG_0, 0), |
| 103 | BPF_EXIT_INSN(), |
| 104 | }; |
| 105 | size_t insn_cnt = ARRAY_SIZE(insns); |
| 106 | union bpf_attr attr; |
| 107 | int prog_fd, err; |
| 108 | |
| 109 | memset(&attr, 0, sizeof(attr)); |
| 110 | attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; |
| 111 | attr.insns = ptr_to_u64(insns); |
| 112 | attr.insn_cnt = insn_cnt; |
| 113 | attr.license = ptr_to_u64("GPL"); |
| 114 | |
| 115 | if (getrlimit(RLIMIT_MEMLOCK, &rlim_init)) |
| 116 | return false; |
| 117 | |
| 118 | /* Drop the soft limit to zero. We maintain the hard limit to its |
| 119 | * current value, because lowering it would be a permanent operation |
| 120 | * for unprivileged users. |
| 121 | */ |
| 122 | rlim_cur_zero.rlim_max = rlim_init.rlim_max; |
| 123 | if (setrlimit(RLIMIT_MEMLOCK, &rlim_cur_zero)) |
| 124 | return false; |
| 125 | |
| 126 | /* Do not use bpf_prog_load() from libbpf here, because it calls |
| 127 | * bump_rlimit_memlock(), interfering with the current probe. |
| 128 | */ |
| 129 | prog_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); |
| 130 | err = errno; |
| 131 | |
| 132 | /* reset soft rlimit to its initial value */ |
| 133 | setrlimit(RLIMIT_MEMLOCK, &rlim_init); |
| 134 | |
| 135 | if (prog_fd < 0) |
| 136 | return err == EPERM; |
| 137 | |
| 138 | close(prog_fd); |
| 139 | return false; |
| 140 | } |
| 141 | |
Quentin Monnet | 6b4384f | 2022-06-10 12:26:47 +0100 | [diff] [blame] | 142 | void set_max_rlimit(void) |
| 143 | { |
| 144 | struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; |
| 145 | |
Quentin Monnet | f0cf642 | 2022-06-29 12:13:51 +0100 | [diff] [blame] | 146 | if (known_to_need_rlimit()) |
| 147 | setrlimit(RLIMIT_MEMLOCK, &rinf); |
Quentin Monnet | 6b4384f | 2022-06-10 12:26:47 +0100 | [diff] [blame] | 148 | } |
| 149 | |
Quentin Monnet | be3245e | 2018-12-18 10:13:18 +0000 | [diff] [blame] | 150 | static int |
| 151 | mnt_fs(const char *target, const char *type, char *buff, size_t bufflen) |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 152 | { |
| 153 | bool bind_done = false; |
| 154 | |
| 155 | while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { |
| 156 | if (errno != EINVAL || bind_done) { |
| 157 | snprintf(buff, bufflen, |
| 158 | "mount --make-private %s failed: %s", |
| 159 | target, strerror(errno)); |
| 160 | return -1; |
| 161 | } |
| 162 | |
| 163 | if (mount(target, target, "none", MS_BIND, NULL)) { |
| 164 | snprintf(buff, bufflen, |
| 165 | "mount --bind %s %s failed: %s", |
| 166 | target, target, strerror(errno)); |
| 167 | return -1; |
| 168 | } |
| 169 | |
| 170 | bind_done = true; |
| 171 | } |
| 172 | |
Quentin Monnet | be3245e | 2018-12-18 10:13:18 +0000 | [diff] [blame] | 173 | if (mount(type, target, type, 0, "mode=0700")) { |
| 174 | snprintf(buff, bufflen, "mount -t %s %s %s failed: %s", |
| 175 | type, type, target, strerror(errno)); |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
Quentin Monnet | be3245e | 2018-12-18 10:13:18 +0000 | [diff] [blame] | 182 | int mount_tracefs(const char *target) |
| 183 | { |
| 184 | char err_str[ERR_MAX_LEN]; |
| 185 | int err; |
| 186 | |
| 187 | err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN); |
| 188 | if (err) { |
| 189 | err_str[ERR_MAX_LEN - 1] = '\0'; |
| 190 | p_err("can't mount tracefs: %s", err_str); |
| 191 | } |
| 192 | |
| 193 | return err; |
| 194 | } |
| 195 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 196 | int open_obj_pinned(const char *path, bool quiet) |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 197 | { |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 198 | char *pname; |
| 199 | int fd = -1; |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 200 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 201 | pname = strdup(path); |
| 202 | if (!pname) { |
Quentin Monnet | f120919 | 2018-11-08 11:52:27 +0000 | [diff] [blame] | 203 | if (!quiet) |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 204 | p_err("mem alloc failed"); |
| 205 | goto out_ret; |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 208 | fd = bpf_obj_get(pname); |
| 209 | if (fd < 0) { |
| 210 | if (!quiet) |
| 211 | p_err("bpf obj get (%s): %s", pname, |
| 212 | errno == EACCES && !is_bpffs(dirname(pname)) ? |
| 213 | "directory not in bpf file system (bpffs)" : |
| 214 | strerror(errno)); |
| 215 | goto out_free; |
| 216 | } |
| 217 | |
| 218 | out_free: |
| 219 | free(pname); |
| 220 | out_ret: |
Prashant Bhole | 1852719 | 2017-11-08 13:55:47 +0900 | [diff] [blame] | 221 | return fd; |
| 222 | } |
| 223 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 224 | int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) |
Prashant Bhole | 1852719 | 2017-11-08 13:55:47 +0900 | [diff] [blame] | 225 | { |
| 226 | enum bpf_obj_type type; |
| 227 | int fd; |
| 228 | |
Quentin Monnet | f120919 | 2018-11-08 11:52:27 +0000 | [diff] [blame] | 229 | fd = open_obj_pinned(path, false); |
Prashant Bhole | 1852719 | 2017-11-08 13:55:47 +0900 | [diff] [blame] | 230 | if (fd < 0) |
| 231 | return -1; |
| 232 | |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 233 | type = get_fd_type(fd); |
| 234 | if (type < 0) { |
| 235 | close(fd); |
| 236 | return type; |
| 237 | } |
| 238 | if (type != exp_type) { |
Quentin Monnet | 9a5ab8b | 2017-10-23 09:24:13 -0700 | [diff] [blame] | 239 | p_err("incorrect object type: %s", get_fd_type_name(type)); |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 240 | close(fd); |
| 241 | return -1; |
| 242 | } |
| 243 | |
| 244 | return fd; |
| 245 | } |
| 246 | |
Stanislav Fomichev | 7738099 | 2018-11-09 08:21:44 -0800 | [diff] [blame] | 247 | int mount_bpffs_for_pin(const char *name) |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 248 | { |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 249 | char err_str[ERR_MAX_LEN]; |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 250 | char *file; |
| 251 | char *dir; |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 252 | int err = 0; |
| 253 | |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 254 | file = malloc(strlen(name) + 1); |
Tobias Klauser | d444b06 | 2021-07-15 13:06:09 +0200 | [diff] [blame] | 255 | if (!file) { |
| 256 | p_err("mem alloc failed"); |
| 257 | return -1; |
| 258 | } |
| 259 | |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 260 | strcpy(file, name); |
| 261 | dir = dirname(file); |
| 262 | |
Stanislav Fomichev | 7738099 | 2018-11-09 08:21:44 -0800 | [diff] [blame] | 263 | if (is_bpffs(dir)) |
| 264 | /* nothing to do if already mounted */ |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 265 | goto out_free; |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 266 | |
Quentin Monnet | 3322130 | 2018-12-18 10:13:19 +0000 | [diff] [blame] | 267 | if (block_mount) { |
| 268 | p_err("no BPF file system found, not mounting it due to --nomount option"); |
| 269 | err = -1; |
| 270 | goto out_free; |
| 271 | } |
| 272 | |
Quentin Monnet | be3245e | 2018-12-18 10:13:18 +0000 | [diff] [blame] | 273 | err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); |
Stanislav Fomichev | 7738099 | 2018-11-09 08:21:44 -0800 | [diff] [blame] | 274 | if (err) { |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 275 | err_str[ERR_MAX_LEN - 1] = '\0'; |
| 276 | p_err("can't mount BPF file system to pin the object (%s): %s", |
| 277 | name, err_str); |
| 278 | } |
| 279 | |
| 280 | out_free: |
| 281 | free(file); |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 282 | return err; |
| 283 | } |
| 284 | |
Stanislav Fomichev | 7738099 | 2018-11-09 08:21:44 -0800 | [diff] [blame] | 285 | int do_pin_fd(int fd, const char *name) |
| 286 | { |
| 287 | int err; |
| 288 | |
| 289 | err = mount_bpffs_for_pin(name); |
| 290 | if (err) |
| 291 | return err; |
| 292 | |
Jakub Kicinski | 3c7be38 | 2019-08-06 17:19:23 -0700 | [diff] [blame] | 293 | err = bpf_obj_pin(fd, name); |
| 294 | if (err) |
| 295 | p_err("can't pin the object (%s): %s", name, strerror(errno)); |
| 296 | |
| 297 | return err; |
Stanislav Fomichev | 7738099 | 2018-11-09 08:21:44 -0800 | [diff] [blame] | 298 | } |
| 299 | |
Quentin Monnet | 75a1e79 | 2020-03-12 18:46:07 +0000 | [diff] [blame] | 300 | int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 301 | { |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 302 | int err; |
| 303 | int fd; |
| 304 | |
Pu Lehui | 34de8e6 | 2022-11-02 16:40:34 +0800 | [diff] [blame] | 305 | if (!REQ_ARGS(3)) |
| 306 | return -EINVAL; |
| 307 | |
Quentin Monnet | 75a1e79 | 2020-03-12 18:46:07 +0000 | [diff] [blame] | 308 | fd = get_fd(&argc, &argv); |
| 309 | if (fd < 0) |
| 310 | return fd; |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 311 | |
Roman Gushchin | 49a086c | 2017-12-13 15:18:53 +0000 | [diff] [blame] | 312 | err = do_pin_fd(fd, *argv); |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 313 | |
Quentin Monnet | 3fc27b7 | 2017-10-24 20:11:28 -0700 | [diff] [blame] | 314 | close(fd); |
| 315 | return err; |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | const char *get_fd_type_name(enum bpf_obj_type type) |
| 319 | { |
| 320 | static const char * const names[] = { |
| 321 | [BPF_OBJ_UNKNOWN] = "unknown", |
| 322 | [BPF_OBJ_PROG] = "prog", |
| 323 | [BPF_OBJ_MAP] = "map", |
Yafang Shao | 7a255ae | 2022-06-29 15:48:32 +0000 | [diff] [blame] | 324 | [BPF_OBJ_LINK] = "link", |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 325 | }; |
| 326 | |
| 327 | if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) |
| 328 | return names[BPF_OBJ_UNKNOWN]; |
| 329 | |
| 330 | return names[type]; |
| 331 | } |
| 332 | |
Raman Shukhau | b662000 | 2022-01-19 02:02:55 -0800 | [diff] [blame] | 333 | void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd, |
| 334 | char *name_buff, size_t buff_len) |
| 335 | { |
| 336 | const char *prog_name = prog_info->name; |
| 337 | const struct btf_type *func_type; |
Andrii Nakryiko | a9a8ac5 | 2022-02-02 14:59:13 -0800 | [diff] [blame] | 338 | const struct bpf_func_info finfo = {}; |
Raman Shukhau | b662000 | 2022-01-19 02:02:55 -0800 | [diff] [blame] | 339 | struct bpf_prog_info info = {}; |
| 340 | __u32 info_len = sizeof(info); |
| 341 | struct btf *prog_btf = NULL; |
| 342 | |
| 343 | if (buff_len <= BPF_OBJ_NAME_LEN || |
| 344 | strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1) |
| 345 | goto copy_name; |
| 346 | |
| 347 | if (!prog_info->btf_id || prog_info->nr_func_info == 0) |
| 348 | goto copy_name; |
| 349 | |
| 350 | info.nr_func_info = 1; |
| 351 | info.func_info_rec_size = prog_info->func_info_rec_size; |
| 352 | if (info.func_info_rec_size > sizeof(finfo)) |
| 353 | info.func_info_rec_size = sizeof(finfo); |
| 354 | info.func_info = ptr_to_u64(&finfo); |
| 355 | |
Ilya Leoshkevich | 38f0408 | 2023-02-15 00:12:16 +0100 | [diff] [blame] | 356 | if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len)) |
Raman Shukhau | b662000 | 2022-01-19 02:02:55 -0800 | [diff] [blame] | 357 | goto copy_name; |
| 358 | |
| 359 | prog_btf = btf__load_from_kernel_by_id(info.btf_id); |
| 360 | if (!prog_btf) |
| 361 | goto copy_name; |
| 362 | |
| 363 | func_type = btf__type_by_id(prog_btf, finfo.type_id); |
| 364 | if (!func_type || !btf_is_func(func_type)) |
| 365 | goto copy_name; |
| 366 | |
| 367 | prog_name = btf__name_by_offset(prog_btf, func_type->name_off); |
| 368 | |
| 369 | copy_name: |
| 370 | snprintf(name_buff, buff_len, "%s", prog_name); |
| 371 | |
| 372 | if (prog_btf) |
| 373 | btf__free(prog_btf); |
| 374 | } |
| 375 | |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 376 | int get_fd_type(int fd) |
| 377 | { |
| 378 | char path[PATH_MAX]; |
| 379 | char buf[512]; |
| 380 | ssize_t n; |
| 381 | |
Quentin Monnet | 327e5da | 2018-11-30 16:25:44 +0000 | [diff] [blame] | 382 | snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 383 | |
| 384 | n = readlink(path, buf, sizeof(buf)); |
| 385 | if (n < 0) { |
Quentin Monnet | 9a5ab8b | 2017-10-23 09:24:13 -0700 | [diff] [blame] | 386 | p_err("can't read link type: %s", strerror(errno)); |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 387 | return -1; |
| 388 | } |
| 389 | if (n == sizeof(path)) { |
Quentin Monnet | 9a5ab8b | 2017-10-23 09:24:13 -0700 | [diff] [blame] | 390 | p_err("can't read link type: path too long!"); |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 391 | return -1; |
| 392 | } |
| 393 | |
| 394 | if (strstr(buf, "bpf-map")) |
| 395 | return BPF_OBJ_MAP; |
| 396 | else if (strstr(buf, "bpf-prog")) |
| 397 | return BPF_OBJ_PROG; |
Andrii Nakryiko | c5481f9 | 2020-04-28 17:16:12 -0700 | [diff] [blame] | 398 | else if (strstr(buf, "bpf-link")) |
| 399 | return BPF_OBJ_LINK; |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 400 | |
| 401 | return BPF_OBJ_UNKNOWN; |
| 402 | } |
| 403 | |
| 404 | char *get_fdinfo(int fd, const char *key) |
| 405 | { |
| 406 | char path[PATH_MAX]; |
| 407 | char *line = NULL; |
| 408 | size_t line_n = 0; |
| 409 | ssize_t n; |
| 410 | FILE *fdi; |
| 411 | |
Quentin Monnet | 327e5da | 2018-11-30 16:25:44 +0000 | [diff] [blame] | 412 | snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 413 | |
| 414 | fdi = fopen(path, "r"); |
Jakub Kicinski | 8c79b35 | 2019-01-28 10:01:21 -0800 | [diff] [blame] | 415 | if (!fdi) |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 416 | return NULL; |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 417 | |
Quentin Monnet | 5390903 | 2018-11-08 11:52:25 +0000 | [diff] [blame] | 418 | while ((n = getline(&line, &line_n, fdi)) > 0) { |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 419 | char *value; |
| 420 | int len; |
| 421 | |
| 422 | if (!strstr(line, key)) |
| 423 | continue; |
| 424 | |
| 425 | fclose(fdi); |
| 426 | |
| 427 | value = strchr(line, '\t'); |
| 428 | if (!value || !value[1]) { |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 429 | free(line); |
| 430 | return NULL; |
| 431 | } |
| 432 | value++; |
| 433 | |
| 434 | len = strlen(value); |
| 435 | memmove(line, value, len); |
| 436 | line[len - 1] = '\0'; |
| 437 | |
| 438 | return line; |
| 439 | } |
| 440 | |
Jakub Kicinski | 71bb428 | 2017-10-04 20:10:04 -0700 | [diff] [blame] | 441 | free(line); |
| 442 | fclose(fdi); |
| 443 | return NULL; |
| 444 | } |
Quentin Monnet | f05e2c3 | 2017-10-23 09:24:10 -0700 | [diff] [blame] | 445 | |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 446 | void print_data_json(uint8_t *data, size_t len) |
| 447 | { |
| 448 | unsigned int i; |
| 449 | |
| 450 | jsonw_start_array(json_wtr); |
| 451 | for (i = 0; i < len; i++) |
| 452 | jsonw_printf(json_wtr, "%d", data[i]); |
| 453 | jsonw_end_array(json_wtr); |
| 454 | } |
| 455 | |
Quentin Monnet | f05e2c3 | 2017-10-23 09:24:10 -0700 | [diff] [blame] | 456 | void print_hex_data_json(uint8_t *data, size_t len) |
| 457 | { |
| 458 | unsigned int i; |
| 459 | |
| 460 | jsonw_start_array(json_wtr); |
| 461 | for (i = 0; i < len; i++) |
| 462 | jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); |
| 463 | jsonw_end_array(json_wtr); |
| 464 | } |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 465 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 466 | /* extra params for nftw cb */ |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 467 | static struct hashmap *build_fn_table; |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 468 | static enum bpf_obj_type build_fn_type; |
| 469 | |
| 470 | static int do_build_table_cb(const char *fpath, const struct stat *sb, |
| 471 | int typeflag, struct FTW *ftwbuf) |
| 472 | { |
| 473 | struct bpf_prog_info pinned_info; |
| 474 | __u32 len = sizeof(pinned_info); |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 475 | enum bpf_obj_type objtype; |
| 476 | int fd, err = 0; |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 477 | char *path; |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 478 | |
| 479 | if (typeflag != FTW_F) |
| 480 | goto out_ret; |
| 481 | |
| 482 | fd = open_obj_pinned(fpath, true); |
| 483 | if (fd < 0) |
| 484 | goto out_ret; |
| 485 | |
| 486 | objtype = get_fd_type(fd); |
| 487 | if (objtype != build_fn_type) |
| 488 | goto out_close; |
| 489 | |
| 490 | memset(&pinned_info, 0, sizeof(pinned_info)); |
Ilya Leoshkevich | 38f0408 | 2023-02-15 00:12:16 +0100 | [diff] [blame] | 491 | if (bpf_prog_get_info_by_fd(fd, &pinned_info, &len)) |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 492 | goto out_close; |
| 493 | |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 494 | path = strdup(fpath); |
| 495 | if (!path) { |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 496 | err = -1; |
| 497 | goto out_close; |
| 498 | } |
| 499 | |
Eduard Zingerman | c302378 | 2022-11-09 16:26:09 +0200 | [diff] [blame] | 500 | err = hashmap__append(build_fn_table, pinned_info.id, path); |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 501 | if (err) { |
| 502 | p_err("failed to append entry to hashmap for ID %u, path '%s': %s", |
| 503 | pinned_info.id, path, strerror(errno)); |
Miaoqian Lin | fa55ef1 | 2022-12-06 11:19:06 +0400 | [diff] [blame] | 504 | free(path); |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 505 | goto out_close; |
| 506 | } |
| 507 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 508 | out_close: |
| 509 | close(fd); |
| 510 | out_ret: |
| 511 | return err; |
| 512 | } |
| 513 | |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 514 | int build_pinned_obj_table(struct hashmap *tab, |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 515 | enum bpf_obj_type type) |
| 516 | { |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 517 | struct mntent *mntent = NULL; |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 518 | FILE *mntfile = NULL; |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 519 | int flags = FTW_PHYS; |
| 520 | int nopenfd = 16; |
| 521 | int err = 0; |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 522 | |
| 523 | mntfile = setmntent("/proc/mounts", "r"); |
| 524 | if (!mntfile) |
| 525 | return -1; |
| 526 | |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 527 | build_fn_table = tab; |
| 528 | build_fn_type = type; |
| 529 | |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 530 | while ((mntent = getmntent(mntfile))) { |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 531 | char *path = mntent->mnt_dir; |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 532 | |
| 533 | if (strncmp(mntent->mnt_type, "bpf", 3) != 0) |
| 534 | continue; |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 535 | err = nftw(path, do_build_table_cb, nopenfd, flags); |
| 536 | if (err) |
| 537 | break; |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 538 | } |
| 539 | fclose(mntfile); |
Tony Ambardar | 9165e1d70 | 2020-07-20 19:48:16 -0700 | [diff] [blame] | 540 | return err; |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 541 | } |
| 542 | |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 543 | void delete_pinned_obj_table(struct hashmap *map) |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 544 | { |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 545 | struct hashmap_entry *entry; |
| 546 | size_t bkt; |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 547 | |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 548 | if (!map) |
| 549 | return; |
| 550 | |
| 551 | hashmap__for_each_entry(map, entry, bkt) |
Eduard Zingerman | c302378 | 2022-11-09 16:26:09 +0200 | [diff] [blame] | 552 | free(entry->pvalue); |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 553 | |
| 554 | hashmap__free(map); |
Prashant Bhole | 4990f1f | 2017-11-08 13:55:48 +0900 | [diff] [blame] | 555 | } |
Jakub Kicinski | 5226221 | 2017-12-27 18:39:10 -0800 | [diff] [blame] | 556 | |
Jakub Kicinski | f412eed | 2018-05-03 18:37:16 -0700 | [diff] [blame] | 557 | unsigned int get_page_size(void) |
| 558 | { |
| 559 | static int result; |
| 560 | |
| 561 | if (!result) |
| 562 | result = getpagesize(); |
| 563 | return result; |
| 564 | } |
| 565 | |
Jakub Kicinski | e64d525 | 2018-05-03 18:37:15 -0700 | [diff] [blame] | 566 | unsigned int get_possible_cpus(void) |
| 567 | { |
Hechao Li | 4c587c1 | 2019-06-10 17:56:52 -0700 | [diff] [blame] | 568 | int cpus = libbpf_num_possible_cpus(); |
Jakub Kicinski | e64d525 | 2018-05-03 18:37:15 -0700 | [diff] [blame] | 569 | |
Hechao Li | 4c587c1 | 2019-06-10 17:56:52 -0700 | [diff] [blame] | 570 | if (cpus < 0) { |
| 571 | p_err("Can't get # of possible cpus: %s", strerror(-cpus)); |
Jakub Kicinski | e64d525 | 2018-05-03 18:37:15 -0700 | [diff] [blame] | 572 | exit(-1); |
| 573 | } |
Hechao Li | 4c587c1 | 2019-06-10 17:56:52 -0700 | [diff] [blame] | 574 | return cpus; |
Jakub Kicinski | e64d525 | 2018-05-03 18:37:15 -0700 | [diff] [blame] | 575 | } |
| 576 | |
Jakub Kicinski | 5226221 | 2017-12-27 18:39:10 -0800 | [diff] [blame] | 577 | static char * |
| 578 | ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) |
| 579 | { |
| 580 | struct stat st; |
| 581 | int err; |
| 582 | |
| 583 | err = stat("/proc/self/ns/net", &st); |
| 584 | if (err) { |
| 585 | p_err("Can't stat /proc/self: %s", strerror(errno)); |
| 586 | return NULL; |
| 587 | } |
| 588 | |
| 589 | if (st.st_dev != ns_dev || st.st_ino != ns_ino) |
| 590 | return NULL; |
| 591 | |
| 592 | return if_indextoname(ifindex, buf); |
| 593 | } |
| 594 | |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 595 | static int read_sysfs_hex_int(char *path) |
| 596 | { |
| 597 | char vendor_id_buf[8]; |
| 598 | int len; |
| 599 | int fd; |
| 600 | |
| 601 | fd = open(path, O_RDONLY); |
| 602 | if (fd < 0) { |
| 603 | p_err("Can't open %s: %s", path, strerror(errno)); |
| 604 | return -1; |
| 605 | } |
| 606 | |
| 607 | len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); |
| 608 | close(fd); |
| 609 | if (len < 0) { |
| 610 | p_err("Can't read %s: %s", path, strerror(errno)); |
| 611 | return -1; |
| 612 | } |
| 613 | if (len >= (int)sizeof(vendor_id_buf)) { |
| 614 | p_err("Value in %s too long", path); |
| 615 | return -1; |
| 616 | } |
| 617 | |
| 618 | vendor_id_buf[len] = 0; |
| 619 | |
| 620 | return strtol(vendor_id_buf, NULL, 0); |
| 621 | } |
| 622 | |
| 623 | static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) |
| 624 | { |
| 625 | char full_path[64]; |
| 626 | |
| 627 | snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", |
| 628 | devname, entry_name); |
| 629 | |
| 630 | return read_sysfs_hex_int(full_path); |
| 631 | } |
| 632 | |
Jakub Kicinski | 3ddeac6 | 2018-10-18 11:34:55 -0700 | [diff] [blame] | 633 | const char * |
Quentin Monnet | ce4f660 | 2022-10-25 16:03:28 +0100 | [diff] [blame] | 634 | ifindex_to_arch(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, const char **opt) |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 635 | { |
Quentin Monnet | ce4f660 | 2022-10-25 16:03:28 +0100 | [diff] [blame] | 636 | __maybe_unused int device_id; |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 637 | char devname[IF_NAMESIZE]; |
| 638 | int vendor_id; |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 639 | |
| 640 | if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { |
| 641 | p_err("Can't get net device name for ifindex %d: %s", ifindex, |
| 642 | strerror(errno)); |
| 643 | return NULL; |
| 644 | } |
| 645 | |
| 646 | vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); |
| 647 | if (vendor_id < 0) { |
| 648 | p_err("Can't get device vendor id for %s", devname); |
| 649 | return NULL; |
| 650 | } |
| 651 | |
| 652 | switch (vendor_id) { |
Quentin Monnet | ce4f660 | 2022-10-25 16:03:28 +0100 | [diff] [blame] | 653 | #ifdef HAVE_LIBBFD_SUPPORT |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 654 | case 0x19ee: |
| 655 | device_id = read_sysfs_netdev_hex_int(devname, "device"); |
| 656 | if (device_id != 0x4000 && |
| 657 | device_id != 0x6000 && |
| 658 | device_id != 0x6003) |
| 659 | p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); |
Jakub Kicinski | 3ddeac6 | 2018-10-18 11:34:55 -0700 | [diff] [blame] | 660 | *opt = "ctx4"; |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 661 | return "NFP-6xxx"; |
Quentin Monnet | ce4f660 | 2022-10-25 16:03:28 +0100 | [diff] [blame] | 662 | #endif /* HAVE_LIBBFD_SUPPORT */ |
| 663 | /* No NFP support in LLVM, we have no valid triple to return. */ |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 664 | default: |
Quentin Monnet | ce4f660 | 2022-10-25 16:03:28 +0100 | [diff] [blame] | 665 | p_err("Can't get arch name for device vendor id 0x%04x", |
Jiong Wang | e659359 | 2018-01-16 16:05:21 -0800 | [diff] [blame] | 666 | vendor_id); |
| 667 | return NULL; |
| 668 | } |
| 669 | } |
| 670 | |
Jakub Kicinski | 5226221 | 2017-12-27 18:39:10 -0800 | [diff] [blame] | 671 | void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) |
| 672 | { |
| 673 | char name[IF_NAMESIZE]; |
| 674 | |
| 675 | if (!ifindex) |
| 676 | return; |
| 677 | |
Quentin Monnet | 73f0b9d | 2018-11-30 16:25:47 +0000 | [diff] [blame] | 678 | printf(" offloaded_to "); |
Jakub Kicinski | 5226221 | 2017-12-27 18:39:10 -0800 | [diff] [blame] | 679 | if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) |
| 680 | printf("%s", name); |
| 681 | else |
| 682 | printf("ifindex %u ns_dev %llu ns_ino %llu", |
| 683 | ifindex, ns_dev, ns_inode); |
| 684 | } |
| 685 | |
| 686 | void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) |
| 687 | { |
| 688 | char name[IF_NAMESIZE]; |
| 689 | |
| 690 | if (!ifindex) |
| 691 | return; |
| 692 | |
| 693 | jsonw_name(json_wtr, "dev"); |
| 694 | jsonw_start_object(json_wtr); |
| 695 | jsonw_uint_field(json_wtr, "ifindex", ifindex); |
| 696 | jsonw_uint_field(json_wtr, "ns_dev", ns_dev); |
| 697 | jsonw_uint_field(json_wtr, "ns_inode", ns_inode); |
| 698 | if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) |
| 699 | jsonw_string_field(json_wtr, "ifname", name); |
| 700 | jsonw_end_object(json_wtr); |
| 701 | } |
Jakub Kicinski | 0b592b5a | 2018-10-15 16:30:36 -0700 | [diff] [blame] | 702 | |
| 703 | int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) |
| 704 | { |
| 705 | char *endptr; |
| 706 | |
| 707 | NEXT_ARGP(); |
| 708 | |
| 709 | if (*val) { |
| 710 | p_err("%s already specified", what); |
| 711 | return -1; |
| 712 | } |
| 713 | |
| 714 | *val = strtoul(**argv, &endptr, 0); |
| 715 | if (*endptr) { |
| 716 | p_err("can't parse %s as %s", **argv, what); |
| 717 | return -1; |
| 718 | } |
| 719 | NEXT_ARGP(); |
| 720 | |
| 721 | return 0; |
| 722 | } |
Quentin Monnet | 6ae32b2 | 2020-03-11 02:12:05 +0000 | [diff] [blame] | 723 | |
| 724 | int __printf(2, 0) |
| 725 | print_all_levels(__maybe_unused enum libbpf_print_level level, |
| 726 | const char *format, va_list args) |
| 727 | { |
| 728 | return vfprintf(stderr, format, args); |
| 729 | } |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 730 | |
| 731 | static int prog_fd_by_nametag(void *nametag, int **fds, bool tag) |
| 732 | { |
Manu Bretelle | d55dfe5 | 2022-08-01 06:24:09 -0700 | [diff] [blame] | 733 | char prog_name[MAX_PROG_FULL_NAME]; |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 734 | unsigned int id = 0; |
| 735 | int fd, nb_fds = 0; |
| 736 | void *tmp; |
| 737 | int err; |
| 738 | |
| 739 | while (true) { |
| 740 | struct bpf_prog_info info = {}; |
| 741 | __u32 len = sizeof(info); |
| 742 | |
| 743 | err = bpf_prog_get_next_id(id, &id); |
| 744 | if (err) { |
| 745 | if (errno != ENOENT) { |
| 746 | p_err("%s", strerror(errno)); |
| 747 | goto err_close_fds; |
| 748 | } |
| 749 | return nb_fds; |
| 750 | } |
| 751 | |
| 752 | fd = bpf_prog_get_fd_by_id(id); |
| 753 | if (fd < 0) { |
| 754 | p_err("can't get prog by id (%u): %s", |
| 755 | id, strerror(errno)); |
| 756 | goto err_close_fds; |
| 757 | } |
| 758 | |
Ilya Leoshkevich | 38f0408 | 2023-02-15 00:12:16 +0100 | [diff] [blame] | 759 | err = bpf_prog_get_info_by_fd(fd, &info, &len); |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 760 | if (err) { |
| 761 | p_err("can't get prog info (%u): %s", |
| 762 | id, strerror(errno)); |
| 763 | goto err_close_fd; |
| 764 | } |
| 765 | |
Manu Bretelle | d55dfe5 | 2022-08-01 06:24:09 -0700 | [diff] [blame] | 766 | if (tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) { |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 767 | close(fd); |
| 768 | continue; |
| 769 | } |
| 770 | |
Manu Bretelle | d55dfe5 | 2022-08-01 06:24:09 -0700 | [diff] [blame] | 771 | if (!tag) { |
| 772 | get_prog_full_name(&info, fd, prog_name, |
| 773 | sizeof(prog_name)); |
| 774 | if (strncmp(nametag, prog_name, sizeof(prog_name))) { |
| 775 | close(fd); |
| 776 | continue; |
| 777 | } |
| 778 | } |
| 779 | |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 780 | if (nb_fds > 0) { |
| 781 | tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); |
| 782 | if (!tmp) { |
| 783 | p_err("failed to realloc"); |
| 784 | goto err_close_fd; |
| 785 | } |
| 786 | *fds = tmp; |
| 787 | } |
| 788 | (*fds)[nb_fds++] = fd; |
| 789 | } |
| 790 | |
| 791 | err_close_fd: |
| 792 | close(fd); |
| 793 | err_close_fds: |
| 794 | while (--nb_fds >= 0) |
| 795 | close((*fds)[nb_fds]); |
| 796 | return -1; |
| 797 | } |
| 798 | |
| 799 | int prog_parse_fds(int *argc, char ***argv, int **fds) |
| 800 | { |
| 801 | if (is_prefix(**argv, "id")) { |
| 802 | unsigned int id; |
| 803 | char *endptr; |
| 804 | |
| 805 | NEXT_ARGP(); |
| 806 | |
| 807 | id = strtoul(**argv, &endptr, 0); |
| 808 | if (*endptr) { |
| 809 | p_err("can't parse %s as ID", **argv); |
| 810 | return -1; |
| 811 | } |
| 812 | NEXT_ARGP(); |
| 813 | |
| 814 | (*fds)[0] = bpf_prog_get_fd_by_id(id); |
| 815 | if ((*fds)[0] < 0) { |
| 816 | p_err("get by id (%u): %s", id, strerror(errno)); |
| 817 | return -1; |
| 818 | } |
| 819 | return 1; |
| 820 | } else if (is_prefix(**argv, "tag")) { |
| 821 | unsigned char tag[BPF_TAG_SIZE]; |
| 822 | |
| 823 | NEXT_ARGP(); |
| 824 | |
| 825 | if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2, |
| 826 | tag + 3, tag + 4, tag + 5, tag + 6, tag + 7) |
| 827 | != BPF_TAG_SIZE) { |
| 828 | p_err("can't parse tag"); |
| 829 | return -1; |
| 830 | } |
| 831 | NEXT_ARGP(); |
| 832 | |
| 833 | return prog_fd_by_nametag(tag, fds, true); |
| 834 | } else if (is_prefix(**argv, "name")) { |
| 835 | char *name; |
| 836 | |
| 837 | NEXT_ARGP(); |
| 838 | |
| 839 | name = **argv; |
Manu Bretelle | d55dfe5 | 2022-08-01 06:24:09 -0700 | [diff] [blame] | 840 | if (strlen(name) > MAX_PROG_FULL_NAME - 1) { |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 841 | p_err("can't parse name"); |
| 842 | return -1; |
| 843 | } |
| 844 | NEXT_ARGP(); |
| 845 | |
| 846 | return prog_fd_by_nametag(name, fds, false); |
| 847 | } else if (is_prefix(**argv, "pinned")) { |
| 848 | char *path; |
| 849 | |
| 850 | NEXT_ARGP(); |
| 851 | |
| 852 | path = **argv; |
| 853 | NEXT_ARGP(); |
| 854 | |
| 855 | (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG); |
| 856 | if ((*fds)[0] < 0) |
| 857 | return -1; |
| 858 | return 1; |
| 859 | } |
| 860 | |
| 861 | p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv); |
| 862 | return -1; |
| 863 | } |
| 864 | |
| 865 | int prog_parse_fd(int *argc, char ***argv) |
| 866 | { |
| 867 | int *fds = NULL; |
| 868 | int nb_fds, fd; |
| 869 | |
| 870 | fds = malloc(sizeof(int)); |
| 871 | if (!fds) { |
| 872 | p_err("mem alloc failed"); |
| 873 | return -1; |
| 874 | } |
| 875 | nb_fds = prog_parse_fds(argc, argv, &fds); |
| 876 | if (nb_fds != 1) { |
| 877 | if (nb_fds > 1) { |
| 878 | p_err("several programs match this handle"); |
| 879 | while (nb_fds--) |
| 880 | close(fds[nb_fds]); |
| 881 | } |
| 882 | fd = -1; |
| 883 | goto exit_free; |
| 884 | } |
| 885 | |
| 886 | fd = fds[0]; |
| 887 | exit_free: |
| 888 | free(fds); |
| 889 | return fd; |
| 890 | } |
| 891 | |
| 892 | static int map_fd_by_name(char *name, int **fds) |
| 893 | { |
| 894 | unsigned int id = 0; |
| 895 | int fd, nb_fds = 0; |
| 896 | void *tmp; |
| 897 | int err; |
| 898 | |
| 899 | while (true) { |
| 900 | struct bpf_map_info info = {}; |
| 901 | __u32 len = sizeof(info); |
| 902 | |
| 903 | err = bpf_map_get_next_id(id, &id); |
| 904 | if (err) { |
| 905 | if (errno != ENOENT) { |
| 906 | p_err("%s", strerror(errno)); |
| 907 | goto err_close_fds; |
| 908 | } |
| 909 | return nb_fds; |
| 910 | } |
| 911 | |
| 912 | fd = bpf_map_get_fd_by_id(id); |
| 913 | if (fd < 0) { |
| 914 | p_err("can't get map by id (%u): %s", |
| 915 | id, strerror(errno)); |
| 916 | goto err_close_fds; |
| 917 | } |
| 918 | |
Ilya Leoshkevich | 38f0408 | 2023-02-15 00:12:16 +0100 | [diff] [blame] | 919 | err = bpf_map_get_info_by_fd(fd, &info, &len); |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 920 | if (err) { |
| 921 | p_err("can't get map info (%u): %s", |
| 922 | id, strerror(errno)); |
| 923 | goto err_close_fd; |
| 924 | } |
| 925 | |
| 926 | if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) { |
| 927 | close(fd); |
| 928 | continue; |
| 929 | } |
| 930 | |
| 931 | if (nb_fds > 0) { |
| 932 | tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); |
| 933 | if (!tmp) { |
| 934 | p_err("failed to realloc"); |
| 935 | goto err_close_fd; |
| 936 | } |
| 937 | *fds = tmp; |
| 938 | } |
| 939 | (*fds)[nb_fds++] = fd; |
| 940 | } |
| 941 | |
| 942 | err_close_fd: |
| 943 | close(fd); |
| 944 | err_close_fds: |
| 945 | while (--nb_fds >= 0) |
| 946 | close((*fds)[nb_fds]); |
| 947 | return -1; |
| 948 | } |
| 949 | |
| 950 | int map_parse_fds(int *argc, char ***argv, int **fds) |
| 951 | { |
| 952 | if (is_prefix(**argv, "id")) { |
| 953 | unsigned int id; |
| 954 | char *endptr; |
| 955 | |
| 956 | NEXT_ARGP(); |
| 957 | |
| 958 | id = strtoul(**argv, &endptr, 0); |
| 959 | if (*endptr) { |
| 960 | p_err("can't parse %s as ID", **argv); |
| 961 | return -1; |
| 962 | } |
| 963 | NEXT_ARGP(); |
| 964 | |
| 965 | (*fds)[0] = bpf_map_get_fd_by_id(id); |
| 966 | if ((*fds)[0] < 0) { |
| 967 | p_err("get map by id (%u): %s", id, strerror(errno)); |
| 968 | return -1; |
| 969 | } |
| 970 | return 1; |
| 971 | } else if (is_prefix(**argv, "name")) { |
| 972 | char *name; |
| 973 | |
| 974 | NEXT_ARGP(); |
| 975 | |
| 976 | name = **argv; |
| 977 | if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { |
| 978 | p_err("can't parse name"); |
| 979 | return -1; |
| 980 | } |
| 981 | NEXT_ARGP(); |
| 982 | |
| 983 | return map_fd_by_name(name, fds); |
| 984 | } else if (is_prefix(**argv, "pinned")) { |
| 985 | char *path; |
| 986 | |
| 987 | NEXT_ARGP(); |
| 988 | |
| 989 | path = **argv; |
| 990 | NEXT_ARGP(); |
| 991 | |
| 992 | (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP); |
| 993 | if ((*fds)[0] < 0) |
| 994 | return -1; |
| 995 | return 1; |
| 996 | } |
| 997 | |
| 998 | p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv); |
| 999 | return -1; |
| 1000 | } |
| 1001 | |
| 1002 | int map_parse_fd(int *argc, char ***argv) |
| 1003 | { |
| 1004 | int *fds = NULL; |
| 1005 | int nb_fds, fd; |
| 1006 | |
| 1007 | fds = malloc(sizeof(int)); |
| 1008 | if (!fds) { |
| 1009 | p_err("mem alloc failed"); |
| 1010 | return -1; |
| 1011 | } |
| 1012 | nb_fds = map_parse_fds(argc, argv, &fds); |
| 1013 | if (nb_fds != 1) { |
| 1014 | if (nb_fds > 1) { |
| 1015 | p_err("several maps match this handle"); |
| 1016 | while (nb_fds--) |
| 1017 | close(fds[nb_fds]); |
| 1018 | } |
| 1019 | fd = -1; |
| 1020 | goto exit_free; |
| 1021 | } |
| 1022 | |
| 1023 | fd = fds[0]; |
| 1024 | exit_free: |
| 1025 | free(fds); |
| 1026 | return fd; |
| 1027 | } |
| 1028 | |
Ilya Leoshkevich | 38f0408 | 2023-02-15 00:12:16 +0100 | [diff] [blame] | 1029 | int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info, |
| 1030 | __u32 *info_len) |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 1031 | { |
| 1032 | int err; |
| 1033 | int fd; |
| 1034 | |
| 1035 | fd = map_parse_fd(argc, argv); |
| 1036 | if (fd < 0) |
| 1037 | return -1; |
| 1038 | |
Ilya Leoshkevich | 38f0408 | 2023-02-15 00:12:16 +0100 | [diff] [blame] | 1039 | err = bpf_map_get_info_by_fd(fd, info, info_len); |
Andrii Nakryiko | a479b8c | 2020-06-19 16:16:58 -0700 | [diff] [blame] | 1040 | if (err) { |
| 1041 | p_err("can't get map info: %s", strerror(errno)); |
| 1042 | close(fd); |
| 1043 | return err; |
| 1044 | } |
| 1045 | |
| 1046 | return fd; |
| 1047 | } |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 1048 | |
Eduard Zingerman | c302378 | 2022-11-09 16:26:09 +0200 | [diff] [blame] | 1049 | size_t hash_fn_for_key_as_id(long key, void *ctx) |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 1050 | { |
Eduard Zingerman | c302378 | 2022-11-09 16:26:09 +0200 | [diff] [blame] | 1051 | return key; |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 1052 | } |
| 1053 | |
Eduard Zingerman | c302378 | 2022-11-09 16:26:09 +0200 | [diff] [blame] | 1054 | bool equal_fn_for_key_as_id(long k1, long k2, void *ctx) |
Quentin Monnet | 8f18473 | 2021-10-23 21:51:52 +0100 | [diff] [blame] | 1055 | { |
| 1056 | return k1 == k2; |
| 1057 | } |
Daniel Müller | 1ba5ad3 | 2022-05-23 23:04:25 +0000 | [diff] [blame] | 1058 | |
| 1059 | const char *bpf_attach_type_input_str(enum bpf_attach_type t) |
| 1060 | { |
| 1061 | switch (t) { |
| 1062 | case BPF_CGROUP_INET_INGRESS: return "ingress"; |
| 1063 | case BPF_CGROUP_INET_EGRESS: return "egress"; |
| 1064 | case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create"; |
| 1065 | case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release"; |
| 1066 | case BPF_CGROUP_SOCK_OPS: return "sock_ops"; |
| 1067 | case BPF_CGROUP_DEVICE: return "device"; |
| 1068 | case BPF_CGROUP_INET4_BIND: return "bind4"; |
| 1069 | case BPF_CGROUP_INET6_BIND: return "bind6"; |
| 1070 | case BPF_CGROUP_INET4_CONNECT: return "connect4"; |
| 1071 | case BPF_CGROUP_INET6_CONNECT: return "connect6"; |
| 1072 | case BPF_CGROUP_INET4_POST_BIND: return "post_bind4"; |
| 1073 | case BPF_CGROUP_INET6_POST_BIND: return "post_bind6"; |
| 1074 | case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4"; |
| 1075 | case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6"; |
| 1076 | case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4"; |
| 1077 | case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6"; |
| 1078 | case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4"; |
| 1079 | case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6"; |
| 1080 | case BPF_CGROUP_SYSCTL: return "sysctl"; |
| 1081 | case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4"; |
| 1082 | case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6"; |
| 1083 | case BPF_CGROUP_GETSOCKOPT: return "getsockopt"; |
| 1084 | case BPF_CGROUP_SETSOCKOPT: return "setsockopt"; |
| 1085 | case BPF_TRACE_RAW_TP: return "raw_tp"; |
| 1086 | case BPF_TRACE_FENTRY: return "fentry"; |
| 1087 | case BPF_TRACE_FEXIT: return "fexit"; |
| 1088 | case BPF_MODIFY_RETURN: return "mod_ret"; |
| 1089 | case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select"; |
| 1090 | case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate"; |
| 1091 | default: return libbpf_bpf_attach_type_str(t); |
| 1092 | } |
| 1093 | } |
Kui-Feng Lee | 0232b78 | 2023-04-19 17:28:21 -0700 | [diff] [blame] | 1094 | |
| 1095 | int pathname_concat(char *buf, int buf_sz, const char *path, |
| 1096 | const char *name) |
| 1097 | { |
| 1098 | int len; |
| 1099 | |
| 1100 | len = snprintf(buf, buf_sz, "%s/%s", path, name); |
| 1101 | if (len < 0) |
| 1102 | return -EINVAL; |
| 1103 | if (len >= buf_sz) |
| 1104 | return -ENAMETOOLONG; |
| 1105 | |
| 1106 | return 0; |
| 1107 | } |