1907b2236SJakub Kicinski // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 25ccda64dSRoman Gushchin // Copyright (C) 2017 Facebook 35ccda64dSRoman Gushchin // Author: Roman Gushchin <guro@fb.com> 45ccda64dSRoman Gushchin 52058b383SRoman Gushchin #define _XOPEN_SOURCE 500 62058b383SRoman Gushchin #include <errno.h> 75ccda64dSRoman Gushchin #include <fcntl.h> 82058b383SRoman Gushchin #include <ftw.h> 92058b383SRoman Gushchin #include <mntent.h> 102058b383SRoman Gushchin #include <stdio.h> 115ccda64dSRoman Gushchin #include <stdlib.h> 125ccda64dSRoman Gushchin #include <string.h> 135ccda64dSRoman Gushchin #include <sys/stat.h> 145ccda64dSRoman Gushchin #include <sys/types.h> 155ccda64dSRoman Gushchin #include <unistd.h> 165ccda64dSRoman Gushchin 175ccda64dSRoman Gushchin #include <bpf.h> 185ccda64dSRoman Gushchin 195ccda64dSRoman Gushchin #include "main.h" 205ccda64dSRoman Gushchin 215ccda64dSRoman Gushchin #define HELP_SPEC_ATTACH_FLAGS \ 225ccda64dSRoman Gushchin "ATTACH_FLAGS := { multi | override }" 235ccda64dSRoman Gushchin 245ccda64dSRoman Gushchin #define HELP_SPEC_ATTACH_TYPES \ 25393de512SAndrey Ignatov " ATTACH_TYPE := { ingress | egress | sock_create |\n" \ 26393de512SAndrey Ignatov " sock_ops | device | bind4 | bind6 |\n" \ 27393de512SAndrey Ignatov " post_bind4 | post_bind6 | connect4 |\n" \ 2813a370b9SAndrey Ignatov " connect6 | sendmsg4 | sendmsg6 }" 295ccda64dSRoman Gushchin 305ccda64dSRoman Gushchin static const char * const attach_type_strings[] = { 315ccda64dSRoman Gushchin [BPF_CGROUP_INET_INGRESS] = "ingress", 325ccda64dSRoman Gushchin [BPF_CGROUP_INET_EGRESS] = "egress", 335ccda64dSRoman Gushchin [BPF_CGROUP_INET_SOCK_CREATE] = "sock_create", 345ccda64dSRoman Gushchin [BPF_CGROUP_SOCK_OPS] = "sock_ops", 355ccda64dSRoman Gushchin [BPF_CGROUP_DEVICE] = "device", 36393de512SAndrey Ignatov [BPF_CGROUP_INET4_BIND] = "bind4", 37393de512SAndrey Ignatov [BPF_CGROUP_INET6_BIND] = "bind6", 38393de512SAndrey Ignatov [BPF_CGROUP_INET4_CONNECT] = "connect4", 39393de512SAndrey Ignatov [BPF_CGROUP_INET6_CONNECT] = "connect6", 40393de512SAndrey Ignatov [BPF_CGROUP_INET4_POST_BIND] = "post_bind4", 41393de512SAndrey Ignatov [BPF_CGROUP_INET6_POST_BIND] = "post_bind6", 4213a370b9SAndrey Ignatov [BPF_CGROUP_UDP4_SENDMSG] = "sendmsg4", 4313a370b9SAndrey Ignatov [BPF_CGROUP_UDP6_SENDMSG] = "sendmsg6", 445ccda64dSRoman Gushchin [__MAX_BPF_ATTACH_TYPE] = NULL, 455ccda64dSRoman Gushchin }; 465ccda64dSRoman Gushchin 475ccda64dSRoman Gushchin static enum bpf_attach_type parse_attach_type(const char *str) 485ccda64dSRoman Gushchin { 495ccda64dSRoman Gushchin enum bpf_attach_type type; 505ccda64dSRoman Gushchin 515ccda64dSRoman Gushchin for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) { 525ccda64dSRoman Gushchin if (attach_type_strings[type] && 535ccda64dSRoman Gushchin is_prefix(str, attach_type_strings[type])) 545ccda64dSRoman Gushchin return type; 555ccda64dSRoman Gushchin } 565ccda64dSRoman Gushchin 575ccda64dSRoman Gushchin return __MAX_BPF_ATTACH_TYPE; 585ccda64dSRoman Gushchin } 595ccda64dSRoman Gushchin 6065b875bcSJakub Kicinski static int show_bpf_prog(int id, const char *attach_type_str, 612058b383SRoman Gushchin const char *attach_flags_str, 622058b383SRoman Gushchin int level) 635ccda64dSRoman Gushchin { 645ccda64dSRoman Gushchin struct bpf_prog_info info = {}; 655ccda64dSRoman Gushchin __u32 info_len = sizeof(info); 665ccda64dSRoman Gushchin int prog_fd; 675ccda64dSRoman Gushchin 685ccda64dSRoman Gushchin prog_fd = bpf_prog_get_fd_by_id(id); 695ccda64dSRoman Gushchin if (prog_fd < 0) 705ccda64dSRoman Gushchin return -1; 715ccda64dSRoman Gushchin 725ccda64dSRoman Gushchin if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) { 735ccda64dSRoman Gushchin close(prog_fd); 745ccda64dSRoman Gushchin return -1; 755ccda64dSRoman Gushchin } 765ccda64dSRoman Gushchin 775ccda64dSRoman Gushchin if (json_output) { 785ccda64dSRoman Gushchin jsonw_start_object(json_wtr); 795ccda64dSRoman Gushchin jsonw_uint_field(json_wtr, "id", info.id); 805ccda64dSRoman Gushchin jsonw_string_field(json_wtr, "attach_type", 815ccda64dSRoman Gushchin attach_type_str); 825ccda64dSRoman Gushchin jsonw_string_field(json_wtr, "attach_flags", 835ccda64dSRoman Gushchin attach_flags_str); 845ccda64dSRoman Gushchin jsonw_string_field(json_wtr, "name", info.name); 855ccda64dSRoman Gushchin jsonw_end_object(json_wtr); 865ccda64dSRoman Gushchin } else { 872058b383SRoman Gushchin printf("%s%-8u %-15s %-15s %-15s\n", level ? " " : "", 882058b383SRoman Gushchin info.id, 895ccda64dSRoman Gushchin attach_type_str, 905ccda64dSRoman Gushchin attach_flags_str, 915ccda64dSRoman Gushchin info.name); 925ccda64dSRoman Gushchin } 935ccda64dSRoman Gushchin 945ccda64dSRoman Gushchin close(prog_fd); 955ccda64dSRoman Gushchin return 0; 965ccda64dSRoman Gushchin } 975ccda64dSRoman Gushchin 982058b383SRoman Gushchin static int count_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type) 992058b383SRoman Gushchin { 1002058b383SRoman Gushchin __u32 prog_cnt = 0; 1012058b383SRoman Gushchin int ret; 1022058b383SRoman Gushchin 1032058b383SRoman Gushchin ret = bpf_prog_query(cgroup_fd, type, 0, NULL, NULL, &prog_cnt); 1042058b383SRoman Gushchin if (ret) 1052058b383SRoman Gushchin return -1; 1062058b383SRoman Gushchin 1072058b383SRoman Gushchin return prog_cnt; 1082058b383SRoman Gushchin } 1092058b383SRoman Gushchin 1102058b383SRoman Gushchin static int show_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type, 1112058b383SRoman Gushchin int level) 1125ccda64dSRoman Gushchin { 1135ccda64dSRoman Gushchin __u32 prog_ids[1024] = {0}; 1145ccda64dSRoman Gushchin char *attach_flags_str; 1155ccda64dSRoman Gushchin __u32 prog_cnt, iter; 1165ccda64dSRoman Gushchin __u32 attach_flags; 1175ccda64dSRoman Gushchin char buf[32]; 1185ccda64dSRoman Gushchin int ret; 1195ccda64dSRoman Gushchin 1205ccda64dSRoman Gushchin prog_cnt = ARRAY_SIZE(prog_ids); 1215ccda64dSRoman Gushchin ret = bpf_prog_query(cgroup_fd, type, 0, &attach_flags, prog_ids, 1225ccda64dSRoman Gushchin &prog_cnt); 1235ccda64dSRoman Gushchin if (ret) 1245ccda64dSRoman Gushchin return ret; 1255ccda64dSRoman Gushchin 1265ccda64dSRoman Gushchin if (prog_cnt == 0) 1275ccda64dSRoman Gushchin return 0; 1285ccda64dSRoman Gushchin 1295ccda64dSRoman Gushchin switch (attach_flags) { 1305ccda64dSRoman Gushchin case BPF_F_ALLOW_MULTI: 1315ccda64dSRoman Gushchin attach_flags_str = "multi"; 1325ccda64dSRoman Gushchin break; 1335ccda64dSRoman Gushchin case BPF_F_ALLOW_OVERRIDE: 1345ccda64dSRoman Gushchin attach_flags_str = "override"; 1355ccda64dSRoman Gushchin break; 1365ccda64dSRoman Gushchin case 0: 1375ccda64dSRoman Gushchin attach_flags_str = ""; 1385ccda64dSRoman Gushchin break; 1395ccda64dSRoman Gushchin default: 1405ccda64dSRoman Gushchin snprintf(buf, sizeof(buf), "unknown(%x)", attach_flags); 1415ccda64dSRoman Gushchin attach_flags_str = buf; 1425ccda64dSRoman Gushchin } 1435ccda64dSRoman Gushchin 1445ccda64dSRoman Gushchin for (iter = 0; iter < prog_cnt; iter++) 14565b875bcSJakub Kicinski show_bpf_prog(prog_ids[iter], attach_type_strings[type], 1462058b383SRoman Gushchin attach_flags_str, level); 1475ccda64dSRoman Gushchin 1485ccda64dSRoman Gushchin return 0; 1495ccda64dSRoman Gushchin } 1505ccda64dSRoman Gushchin 15165b875bcSJakub Kicinski static int do_show(int argc, char **argv) 1525ccda64dSRoman Gushchin { 1535ccda64dSRoman Gushchin enum bpf_attach_type type; 1545ccda64dSRoman Gushchin int cgroup_fd; 1555ccda64dSRoman Gushchin int ret = -1; 1565ccda64dSRoman Gushchin 1575ccda64dSRoman Gushchin if (argc < 1) { 158b4fac96dSJakub Kicinski p_err("too few parameters for cgroup show"); 1595ccda64dSRoman Gushchin goto exit; 1605ccda64dSRoman Gushchin } else if (argc > 1) { 161b4fac96dSJakub Kicinski p_err("too many parameters for cgroup show"); 1625ccda64dSRoman Gushchin goto exit; 1635ccda64dSRoman Gushchin } 1645ccda64dSRoman Gushchin 1655ccda64dSRoman Gushchin cgroup_fd = open(argv[0], O_RDONLY); 1665ccda64dSRoman Gushchin if (cgroup_fd < 0) { 167b4fac96dSJakub Kicinski p_err("can't open cgroup %s", argv[1]); 1685ccda64dSRoman Gushchin goto exit; 1695ccda64dSRoman Gushchin } 1705ccda64dSRoman Gushchin 1715ccda64dSRoman Gushchin if (json_output) 1725ccda64dSRoman Gushchin jsonw_start_array(json_wtr); 1735ccda64dSRoman Gushchin else 1745ccda64dSRoman Gushchin printf("%-8s %-15s %-15s %-15s\n", "ID", "AttachType", 1755ccda64dSRoman Gushchin "AttachFlags", "Name"); 1765ccda64dSRoman Gushchin 1775ccda64dSRoman Gushchin for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) { 1785ccda64dSRoman Gushchin /* 1795ccda64dSRoman Gushchin * Not all attach types may be supported, so it's expected, 1805ccda64dSRoman Gushchin * that some requests will fail. 18165b875bcSJakub Kicinski * If we were able to get the show for at least one 1825ccda64dSRoman Gushchin * attach type, let's return 0. 1835ccda64dSRoman Gushchin */ 1842058b383SRoman Gushchin if (show_attached_bpf_progs(cgroup_fd, type, 0) == 0) 1855ccda64dSRoman Gushchin ret = 0; 1865ccda64dSRoman Gushchin } 1875ccda64dSRoman Gushchin 1885ccda64dSRoman Gushchin if (json_output) 1895ccda64dSRoman Gushchin jsonw_end_array(json_wtr); 1905ccda64dSRoman Gushchin 1915ccda64dSRoman Gushchin close(cgroup_fd); 1925ccda64dSRoman Gushchin exit: 1935ccda64dSRoman Gushchin return ret; 1945ccda64dSRoman Gushchin } 1955ccda64dSRoman Gushchin 1962058b383SRoman Gushchin /* 1972058b383SRoman Gushchin * To distinguish nftw() errors and do_show_tree_fn() errors 1982058b383SRoman Gushchin * and avoid duplicating error messages, let's return -2 1992058b383SRoman Gushchin * from do_show_tree_fn() in case of error. 2002058b383SRoman Gushchin */ 2012058b383SRoman Gushchin #define NFTW_ERR -1 2022058b383SRoman Gushchin #define SHOW_TREE_FN_ERR -2 2032058b383SRoman Gushchin static int do_show_tree_fn(const char *fpath, const struct stat *sb, 2042058b383SRoman Gushchin int typeflag, struct FTW *ftw) 2052058b383SRoman Gushchin { 2062058b383SRoman Gushchin enum bpf_attach_type type; 2072058b383SRoman Gushchin bool skip = true; 2082058b383SRoman Gushchin int cgroup_fd; 2092058b383SRoman Gushchin 2102058b383SRoman Gushchin if (typeflag != FTW_D) 2112058b383SRoman Gushchin return 0; 2122058b383SRoman Gushchin 2132058b383SRoman Gushchin cgroup_fd = open(fpath, O_RDONLY); 2142058b383SRoman Gushchin if (cgroup_fd < 0) { 2152058b383SRoman Gushchin p_err("can't open cgroup %s: %s", fpath, strerror(errno)); 2162058b383SRoman Gushchin return SHOW_TREE_FN_ERR; 2172058b383SRoman Gushchin } 2182058b383SRoman Gushchin 2192058b383SRoman Gushchin for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) { 2202058b383SRoman Gushchin int count = count_attached_bpf_progs(cgroup_fd, type); 2212058b383SRoman Gushchin 2222058b383SRoman Gushchin if (count < 0 && errno != EINVAL) { 2232058b383SRoman Gushchin p_err("can't query bpf programs attached to %s: %s", 2242058b383SRoman Gushchin fpath, strerror(errno)); 2252058b383SRoman Gushchin close(cgroup_fd); 2262058b383SRoman Gushchin return SHOW_TREE_FN_ERR; 2272058b383SRoman Gushchin } 2282058b383SRoman Gushchin if (count > 0) { 2292058b383SRoman Gushchin skip = false; 2302058b383SRoman Gushchin break; 2312058b383SRoman Gushchin } 2322058b383SRoman Gushchin } 2332058b383SRoman Gushchin 2342058b383SRoman Gushchin if (skip) { 2352058b383SRoman Gushchin close(cgroup_fd); 2362058b383SRoman Gushchin return 0; 2372058b383SRoman Gushchin } 2382058b383SRoman Gushchin 2392058b383SRoman Gushchin if (json_output) { 2402058b383SRoman Gushchin jsonw_start_object(json_wtr); 2412058b383SRoman Gushchin jsonw_string_field(json_wtr, "cgroup", fpath); 2422058b383SRoman Gushchin jsonw_name(json_wtr, "programs"); 2432058b383SRoman Gushchin jsonw_start_array(json_wtr); 2442058b383SRoman Gushchin } else { 2452058b383SRoman Gushchin printf("%s\n", fpath); 2462058b383SRoman Gushchin } 2472058b383SRoman Gushchin 2482058b383SRoman Gushchin for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) 2492058b383SRoman Gushchin show_attached_bpf_progs(cgroup_fd, type, ftw->level); 2502058b383SRoman Gushchin 25139c9f106SQuentin Monnet if (errno == EINVAL) 25239c9f106SQuentin Monnet /* Last attach type does not support query. 25339c9f106SQuentin Monnet * Do not report an error for this, especially because batch 25439c9f106SQuentin Monnet * mode would stop processing commands. 25539c9f106SQuentin Monnet */ 25639c9f106SQuentin Monnet errno = 0; 25739c9f106SQuentin Monnet 2582058b383SRoman Gushchin if (json_output) { 2592058b383SRoman Gushchin jsonw_end_array(json_wtr); 2602058b383SRoman Gushchin jsonw_end_object(json_wtr); 2612058b383SRoman Gushchin } 2622058b383SRoman Gushchin 2632058b383SRoman Gushchin close(cgroup_fd); 2642058b383SRoman Gushchin 2652058b383SRoman Gushchin return 0; 2662058b383SRoman Gushchin } 2672058b383SRoman Gushchin 2682058b383SRoman Gushchin static char *find_cgroup_root(void) 2692058b383SRoman Gushchin { 2702058b383SRoman Gushchin struct mntent *mnt; 2712058b383SRoman Gushchin FILE *f; 2722058b383SRoman Gushchin 2732058b383SRoman Gushchin f = fopen("/proc/mounts", "r"); 2742058b383SRoman Gushchin if (f == NULL) 2752058b383SRoman Gushchin return NULL; 2762058b383SRoman Gushchin 2772058b383SRoman Gushchin while ((mnt = getmntent(f))) { 2782058b383SRoman Gushchin if (strcmp(mnt->mnt_type, "cgroup2") == 0) { 2792058b383SRoman Gushchin fclose(f); 2802058b383SRoman Gushchin return strdup(mnt->mnt_dir); 2812058b383SRoman Gushchin } 2822058b383SRoman Gushchin } 2832058b383SRoman Gushchin 2842058b383SRoman Gushchin fclose(f); 2852058b383SRoman Gushchin return NULL; 2862058b383SRoman Gushchin } 2872058b383SRoman Gushchin 2882058b383SRoman Gushchin static int do_show_tree(int argc, char **argv) 2892058b383SRoman Gushchin { 2902058b383SRoman Gushchin char *cgroup_root; 2912058b383SRoman Gushchin int ret; 2922058b383SRoman Gushchin 2932058b383SRoman Gushchin switch (argc) { 2942058b383SRoman Gushchin case 0: 2952058b383SRoman Gushchin cgroup_root = find_cgroup_root(); 2962058b383SRoman Gushchin if (!cgroup_root) { 2972058b383SRoman Gushchin p_err("cgroup v2 isn't mounted"); 2982058b383SRoman Gushchin return -1; 2992058b383SRoman Gushchin } 3002058b383SRoman Gushchin break; 3012058b383SRoman Gushchin case 1: 3022058b383SRoman Gushchin cgroup_root = argv[0]; 3032058b383SRoman Gushchin break; 3042058b383SRoman Gushchin default: 3052058b383SRoman Gushchin p_err("too many parameters for cgroup tree"); 3062058b383SRoman Gushchin return -1; 3072058b383SRoman Gushchin } 3082058b383SRoman Gushchin 3092058b383SRoman Gushchin 3102058b383SRoman Gushchin if (json_output) 3112058b383SRoman Gushchin jsonw_start_array(json_wtr); 3122058b383SRoman Gushchin else 3132058b383SRoman Gushchin printf("%s\n" 3142058b383SRoman Gushchin "%-8s %-15s %-15s %-15s\n", 3152058b383SRoman Gushchin "CgroupPath", 3162058b383SRoman Gushchin "ID", "AttachType", "AttachFlags", "Name"); 3172058b383SRoman Gushchin 3182058b383SRoman Gushchin switch (nftw(cgroup_root, do_show_tree_fn, 1024, FTW_MOUNT)) { 3192058b383SRoman Gushchin case NFTW_ERR: 3202058b383SRoman Gushchin p_err("can't iterate over %s: %s", cgroup_root, 3212058b383SRoman Gushchin strerror(errno)); 3222058b383SRoman Gushchin ret = -1; 3232058b383SRoman Gushchin break; 3242058b383SRoman Gushchin case SHOW_TREE_FN_ERR: 3252058b383SRoman Gushchin ret = -1; 3262058b383SRoman Gushchin break; 3272058b383SRoman Gushchin default: 3282058b383SRoman Gushchin ret = 0; 3292058b383SRoman Gushchin } 3302058b383SRoman Gushchin 3312058b383SRoman Gushchin if (json_output) 3322058b383SRoman Gushchin jsonw_end_array(json_wtr); 3332058b383SRoman Gushchin 3342058b383SRoman Gushchin if (argc == 0) 3352058b383SRoman Gushchin free(cgroup_root); 3362058b383SRoman Gushchin 3372058b383SRoman Gushchin return ret; 3382058b383SRoman Gushchin } 3392058b383SRoman Gushchin 3405ccda64dSRoman Gushchin static int do_attach(int argc, char **argv) 3415ccda64dSRoman Gushchin { 3425ccda64dSRoman Gushchin enum bpf_attach_type attach_type; 3435ccda64dSRoman Gushchin int cgroup_fd, prog_fd; 3445ccda64dSRoman Gushchin int attach_flags = 0; 3455ccda64dSRoman Gushchin int ret = -1; 3465ccda64dSRoman Gushchin int i; 3475ccda64dSRoman Gushchin 3485ccda64dSRoman Gushchin if (argc < 4) { 349b4fac96dSJakub Kicinski p_err("too few parameters for cgroup attach"); 3505ccda64dSRoman Gushchin goto exit; 3515ccda64dSRoman Gushchin } 3525ccda64dSRoman Gushchin 3535ccda64dSRoman Gushchin cgroup_fd = open(argv[0], O_RDONLY); 3545ccda64dSRoman Gushchin if (cgroup_fd < 0) { 355b4fac96dSJakub Kicinski p_err("can't open cgroup %s", argv[1]); 3565ccda64dSRoman Gushchin goto exit; 3575ccda64dSRoman Gushchin } 3585ccda64dSRoman Gushchin 3595ccda64dSRoman Gushchin attach_type = parse_attach_type(argv[1]); 3605ccda64dSRoman Gushchin if (attach_type == __MAX_BPF_ATTACH_TYPE) { 361b4fac96dSJakub Kicinski p_err("invalid attach type"); 3625ccda64dSRoman Gushchin goto exit_cgroup; 3635ccda64dSRoman Gushchin } 3645ccda64dSRoman Gushchin 3655ccda64dSRoman Gushchin argc -= 2; 3665ccda64dSRoman Gushchin argv = &argv[2]; 3675ccda64dSRoman Gushchin prog_fd = prog_parse_fd(&argc, &argv); 3685ccda64dSRoman Gushchin if (prog_fd < 0) 3695ccda64dSRoman Gushchin goto exit_cgroup; 3705ccda64dSRoman Gushchin 3715ccda64dSRoman Gushchin for (i = 0; i < argc; i++) { 3725ccda64dSRoman Gushchin if (is_prefix(argv[i], "multi")) { 3735ccda64dSRoman Gushchin attach_flags |= BPF_F_ALLOW_MULTI; 3745ccda64dSRoman Gushchin } else if (is_prefix(argv[i], "override")) { 3755ccda64dSRoman Gushchin attach_flags |= BPF_F_ALLOW_OVERRIDE; 3765ccda64dSRoman Gushchin } else { 377b4fac96dSJakub Kicinski p_err("unknown option: %s", argv[i]); 3785ccda64dSRoman Gushchin goto exit_cgroup; 3795ccda64dSRoman Gushchin } 3805ccda64dSRoman Gushchin } 3815ccda64dSRoman Gushchin 3825ccda64dSRoman Gushchin if (bpf_prog_attach(prog_fd, cgroup_fd, attach_type, attach_flags)) { 3835ccda64dSRoman Gushchin p_err("failed to attach program"); 3845ccda64dSRoman Gushchin goto exit_prog; 3855ccda64dSRoman Gushchin } 3865ccda64dSRoman Gushchin 3875ccda64dSRoman Gushchin if (json_output) 3885ccda64dSRoman Gushchin jsonw_null(json_wtr); 3895ccda64dSRoman Gushchin 3905ccda64dSRoman Gushchin ret = 0; 3915ccda64dSRoman Gushchin 3925ccda64dSRoman Gushchin exit_prog: 3935ccda64dSRoman Gushchin close(prog_fd); 3945ccda64dSRoman Gushchin exit_cgroup: 3955ccda64dSRoman Gushchin close(cgroup_fd); 3965ccda64dSRoman Gushchin exit: 3975ccda64dSRoman Gushchin return ret; 3985ccda64dSRoman Gushchin } 3995ccda64dSRoman Gushchin 4005ccda64dSRoman Gushchin static int do_detach(int argc, char **argv) 4015ccda64dSRoman Gushchin { 4025ccda64dSRoman Gushchin enum bpf_attach_type attach_type; 4035ccda64dSRoman Gushchin int prog_fd, cgroup_fd; 4045ccda64dSRoman Gushchin int ret = -1; 4055ccda64dSRoman Gushchin 4065ccda64dSRoman Gushchin if (argc < 4) { 407b4fac96dSJakub Kicinski p_err("too few parameters for cgroup detach"); 4085ccda64dSRoman Gushchin goto exit; 4095ccda64dSRoman Gushchin } 4105ccda64dSRoman Gushchin 4115ccda64dSRoman Gushchin cgroup_fd = open(argv[0], O_RDONLY); 4125ccda64dSRoman Gushchin if (cgroup_fd < 0) { 413b4fac96dSJakub Kicinski p_err("can't open cgroup %s", argv[1]); 4145ccda64dSRoman Gushchin goto exit; 4155ccda64dSRoman Gushchin } 4165ccda64dSRoman Gushchin 4175ccda64dSRoman Gushchin attach_type = parse_attach_type(argv[1]); 4185ccda64dSRoman Gushchin if (attach_type == __MAX_BPF_ATTACH_TYPE) { 4195ccda64dSRoman Gushchin p_err("invalid attach type"); 4205ccda64dSRoman Gushchin goto exit_cgroup; 4215ccda64dSRoman Gushchin } 4225ccda64dSRoman Gushchin 4235ccda64dSRoman Gushchin argc -= 2; 4245ccda64dSRoman Gushchin argv = &argv[2]; 4255ccda64dSRoman Gushchin prog_fd = prog_parse_fd(&argc, &argv); 4265ccda64dSRoman Gushchin if (prog_fd < 0) 4275ccda64dSRoman Gushchin goto exit_cgroup; 4285ccda64dSRoman Gushchin 4295ccda64dSRoman Gushchin if (bpf_prog_detach2(prog_fd, cgroup_fd, attach_type)) { 4305ccda64dSRoman Gushchin p_err("failed to detach program"); 4315ccda64dSRoman Gushchin goto exit_prog; 4325ccda64dSRoman Gushchin } 4335ccda64dSRoman Gushchin 4345ccda64dSRoman Gushchin if (json_output) 4355ccda64dSRoman Gushchin jsonw_null(json_wtr); 4365ccda64dSRoman Gushchin 4375ccda64dSRoman Gushchin ret = 0; 4385ccda64dSRoman Gushchin 4395ccda64dSRoman Gushchin exit_prog: 4405ccda64dSRoman Gushchin close(prog_fd); 4415ccda64dSRoman Gushchin exit_cgroup: 4425ccda64dSRoman Gushchin close(cgroup_fd); 4435ccda64dSRoman Gushchin exit: 4445ccda64dSRoman Gushchin return ret; 4455ccda64dSRoman Gushchin } 4465ccda64dSRoman Gushchin 4475ccda64dSRoman Gushchin static int do_help(int argc, char **argv) 4485ccda64dSRoman Gushchin { 4495ccda64dSRoman Gushchin if (json_output) { 4505ccda64dSRoman Gushchin jsonw_null(json_wtr); 4515ccda64dSRoman Gushchin return 0; 4525ccda64dSRoman Gushchin } 4535ccda64dSRoman Gushchin 4545ccda64dSRoman Gushchin fprintf(stderr, 4556ebe6dbdSJakub Kicinski "Usage: %s %s { show | list } CGROUP\n" 4562058b383SRoman Gushchin " %s %s tree [CGROUP_ROOT]\n" 4575ccda64dSRoman Gushchin " %s %s attach CGROUP ATTACH_TYPE PROG [ATTACH_FLAGS]\n" 4585ccda64dSRoman Gushchin " %s %s detach CGROUP ATTACH_TYPE PROG\n" 4595ccda64dSRoman Gushchin " %s %s help\n" 4605ccda64dSRoman Gushchin "\n" 461393de512SAndrey Ignatov HELP_SPEC_ATTACH_TYPES "\n" 4625ccda64dSRoman Gushchin " " HELP_SPEC_ATTACH_FLAGS "\n" 4635ccda64dSRoman Gushchin " " HELP_SPEC_PROGRAM "\n" 4645ccda64dSRoman Gushchin " " HELP_SPEC_OPTIONS "\n" 4655ccda64dSRoman Gushchin "", 4662058b383SRoman Gushchin bin_name, argv[-2], 4675ccda64dSRoman Gushchin bin_name, argv[-2], bin_name, argv[-2], 4685ccda64dSRoman Gushchin bin_name, argv[-2], bin_name, argv[-2]); 4695ccda64dSRoman Gushchin 4705ccda64dSRoman Gushchin return 0; 4715ccda64dSRoman Gushchin } 4725ccda64dSRoman Gushchin 4735ccda64dSRoman Gushchin static const struct cmd cmds[] = { 4746ebe6dbdSJakub Kicinski { "show", do_show }, 47565b875bcSJakub Kicinski { "list", do_show }, 4762058b383SRoman Gushchin { "tree", do_show_tree }, 4775ccda64dSRoman Gushchin { "attach", do_attach }, 4785ccda64dSRoman Gushchin { "detach", do_detach }, 4795ccda64dSRoman Gushchin { "help", do_help }, 4805ccda64dSRoman Gushchin { 0 } 4815ccda64dSRoman Gushchin }; 4825ccda64dSRoman Gushchin 4835ccda64dSRoman Gushchin int do_cgroup(int argc, char **argv) 4845ccda64dSRoman Gushchin { 4855ccda64dSRoman Gushchin return cmd_select(cmds, argc, argv, do_help); 4865ccda64dSRoman Gushchin } 487