| // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ |
| |
| #ifndef _GNU_SOURCE |
| #define _GNU_SOURCE |
| #endif |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <ftw.h> |
| #include <libgen.h> |
| #include <mntent.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <net/if.h> |
| #include <sys/mount.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/vfs.h> |
| |
| #include <linux/filter.h> |
| #include <linux/limits.h> |
| #include <linux/magic.h> |
| #include <linux/unistd.h> |
| |
| #include <bpf/bpf.h> |
| #include <bpf/hashmap.h> |
| #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */ |
| #include <bpf/btf.h> |
| |
| #include "main.h" |
| |
| #ifndef BPF_FS_MAGIC |
| #define BPF_FS_MAGIC 0xcafe4a11 |
| #endif |
| |
| void p_err(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, fmt); |
| if (json_output) { |
| jsonw_start_object(json_wtr); |
| jsonw_name(json_wtr, "error"); |
| jsonw_vprintf_enquote(json_wtr, fmt, ap); |
| jsonw_end_object(json_wtr); |
| } else { |
| fprintf(stderr, "Error: "); |
| vfprintf(stderr, fmt, ap); |
| fprintf(stderr, "\n"); |
| } |
| va_end(ap); |
| } |
| |
| void p_info(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| if (json_output) |
| return; |
| |
| va_start(ap, fmt); |
| vfprintf(stderr, fmt, ap); |
| fprintf(stderr, "\n"); |
| va_end(ap); |
| } |
| |
| static bool is_bpffs(char *path) |
| { |
| struct statfs st_fs; |
| |
| if (statfs(path, &st_fs) < 0) |
| return false; |
| |
| return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; |
| } |
| |
| /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to |
| * memcg-based memory accounting for BPF maps and programs. This was done in |
| * commit 97306be45fbe ("Merge branch 'switch to memcg-based memory |
| * accounting'"), in Linux 5.11. |
| * |
| * Libbpf also offers to probe for memcg-based accounting vs rlimit, but does |
| * so by checking for the availability of a given BPF helper and this has |
| * failed on some kernels with backports in the past, see commit 6b4384ff1088 |
| * ("Revert "bpftool: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK""). |
| * Instead, we can probe by lowering the process-based rlimit to 0, trying to |
| * load a BPF object, and resetting the rlimit. If the load succeeds then |
| * memcg-based accounting is supported. |
| * |
| * This would be too dangerous to do in the library, because multithreaded |
| * applications might attempt to load items while the rlimit is at 0. Given |
| * that bpftool is single-threaded, this is fine to do here. |
| */ |
| static bool known_to_need_rlimit(void) |
| { |
| struct rlimit rlim_init, rlim_cur_zero = {}; |
| struct bpf_insn insns[] = { |
| BPF_MOV64_IMM(BPF_REG_0, 0), |
| BPF_EXIT_INSN(), |
| }; |
| size_t insn_cnt = ARRAY_SIZE(insns); |
| union bpf_attr attr; |
| int prog_fd, err; |
| |
| memset(&attr, 0, sizeof(attr)); |
| attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; |
| attr.insns = ptr_to_u64(insns); |
| attr.insn_cnt = insn_cnt; |
| attr.license = ptr_to_u64("GPL"); |
| |
| if (getrlimit(RLIMIT_MEMLOCK, &rlim_init)) |
| return false; |
| |
| /* Drop the soft limit to zero. We maintain the hard limit to its |
| * current value, because lowering it would be a permanent operation |
| * for unprivileged users. |
| */ |
| rlim_cur_zero.rlim_max = rlim_init.rlim_max; |
| if (setrlimit(RLIMIT_MEMLOCK, &rlim_cur_zero)) |
| return false; |
| |
| /* Do not use bpf_prog_load() from libbpf here, because it calls |
| * bump_rlimit_memlock(), interfering with the current probe. |
| */ |
| prog_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); |
| err = errno; |
| |
| /* reset soft rlimit to its initial value */ |
| setrlimit(RLIMIT_MEMLOCK, &rlim_init); |
| |
| if (prog_fd < 0) |
| return err == EPERM; |
| |
| close(prog_fd); |
| return false; |
| } |
| |
| void set_max_rlimit(void) |
| { |
| struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; |
| |
| if (known_to_need_rlimit()) |
| setrlimit(RLIMIT_MEMLOCK, &rinf); |
| } |
| |
| static int |
| mnt_fs(const char *target, const char *type, char *buff, size_t bufflen) |
| { |
| bool bind_done = false; |
| |
| while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { |
| if (errno != EINVAL || bind_done) { |
| snprintf(buff, bufflen, |
| "mount --make-private %s failed: %s", |
| target, strerror(errno)); |
| return -1; |
| } |
| |
| if (mount(target, target, "none", MS_BIND, NULL)) { |
| snprintf(buff, bufflen, |
| "mount --bind %s %s failed: %s", |
| target, target, strerror(errno)); |
| return -1; |
| } |
| |
| bind_done = true; |
| } |
| |
| if (mount(type, target, type, 0, "mode=0700")) { |
| snprintf(buff, bufflen, "mount -t %s %s %s failed: %s", |
| type, type, target, strerror(errno)); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int mount_tracefs(const char *target) |
| { |
| char err_str[ERR_MAX_LEN]; |
| int err; |
| |
| err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN); |
| if (err) { |
| err_str[ERR_MAX_LEN - 1] = '\0'; |
| p_err("can't mount tracefs: %s", err_str); |
| } |
| |
| return err; |
| } |
| |
| int open_obj_pinned(const char *path, bool quiet) |
| { |
| char *pname; |
| int fd = -1; |
| |
| pname = strdup(path); |
| if (!pname) { |
| if (!quiet) |
| p_err("mem alloc failed"); |
| goto out_ret; |
| } |
| |
| fd = bpf_obj_get(pname); |
| if (fd < 0) { |
| if (!quiet) |
| p_err("bpf obj get (%s): %s", pname, |
| errno == EACCES && !is_bpffs(dirname(pname)) ? |
| "directory not in bpf file system (bpffs)" : |
| strerror(errno)); |
| goto out_free; |
| } |
| |
| out_free: |
| free(pname); |
| out_ret: |
| return fd; |
| } |
| |
| int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) |
| { |
| enum bpf_obj_type type; |
| int fd; |
| |
| fd = open_obj_pinned(path, false); |
| if (fd < 0) |
| return -1; |
| |
| type = get_fd_type(fd); |
| if (type < 0) { |
| close(fd); |
| return type; |
| } |
| if (type != exp_type) { |
| p_err("incorrect object type: %s", get_fd_type_name(type)); |
| close(fd); |
| return -1; |
| } |
| |
| return fd; |
| } |
| |
| int mount_bpffs_for_pin(const char *name) |
| { |
| char err_str[ERR_MAX_LEN]; |
| char *file; |
| char *dir; |
| int err = 0; |
| |
| file = malloc(strlen(name) + 1); |
| if (!file) { |
| p_err("mem alloc failed"); |
| return -1; |
| } |
| |
| strcpy(file, name); |
| dir = dirname(file); |
| |
| if (is_bpffs(dir)) |
| /* nothing to do if already mounted */ |
| goto out_free; |
| |
| if (block_mount) { |
| p_err("no BPF file system found, not mounting it due to --nomount option"); |
| err = -1; |
| goto out_free; |
| } |
| |
| err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); |
| if (err) { |
| err_str[ERR_MAX_LEN - 1] = '\0'; |
| p_err("can't mount BPF file system to pin the object (%s): %s", |
| name, err_str); |
| } |
| |
| out_free: |
| free(file); |
| return err; |
| } |
| |
| int do_pin_fd(int fd, const char *name) |
| { |
| int err; |
| |
| err = mount_bpffs_for_pin(name); |
| if (err) |
| return err; |
| |
| err = bpf_obj_pin(fd, name); |
| if (err) |
| p_err("can't pin the object (%s): %s", name, strerror(errno)); |
| |
| return err; |
| } |
| |
| int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) |
| { |
| int err; |
| int fd; |
| |
| if (!REQ_ARGS(3)) |
| return -EINVAL; |
| |
| fd = get_fd(&argc, &argv); |
| if (fd < 0) |
| return fd; |
| |
| err = do_pin_fd(fd, *argv); |
| |
| close(fd); |
| return err; |
| } |
| |
| const char *get_fd_type_name(enum bpf_obj_type type) |
| { |
| static const char * const names[] = { |
| [BPF_OBJ_UNKNOWN] = "unknown", |
| [BPF_OBJ_PROG] = "prog", |
| [BPF_OBJ_MAP] = "map", |
| [BPF_OBJ_LINK] = "link", |
| }; |
| |
| if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) |
| return names[BPF_OBJ_UNKNOWN]; |
| |
| return names[type]; |
| } |
| |
| void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd, |
| char *name_buff, size_t buff_len) |
| { |
| const char *prog_name = prog_info->name; |
| const struct btf_type *func_type; |
| const struct bpf_func_info finfo = {}; |
| struct bpf_prog_info info = {}; |
| __u32 info_len = sizeof(info); |
| struct btf *prog_btf = NULL; |
| |
| if (buff_len <= BPF_OBJ_NAME_LEN || |
| strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1) |
| goto copy_name; |
| |
| if (!prog_info->btf_id || prog_info->nr_func_info == 0) |
| goto copy_name; |
| |
| info.nr_func_info = 1; |
| info.func_info_rec_size = prog_info->func_info_rec_size; |
| if (info.func_info_rec_size > sizeof(finfo)) |
| info.func_info_rec_size = sizeof(finfo); |
| info.func_info = ptr_to_u64(&finfo); |
| |
| if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) |
| goto copy_name; |
| |
| prog_btf = btf__load_from_kernel_by_id(info.btf_id); |
| if (!prog_btf) |
| goto copy_name; |
| |
| func_type = btf__type_by_id(prog_btf, finfo.type_id); |
| if (!func_type || !btf_is_func(func_type)) |
| goto copy_name; |
| |
| prog_name = btf__name_by_offset(prog_btf, func_type->name_off); |
| |
| copy_name: |
| snprintf(name_buff, buff_len, "%s", prog_name); |
| |
| if (prog_btf) |
| btf__free(prog_btf); |
| } |
| |
| int get_fd_type(int fd) |
| { |
| char path[PATH_MAX]; |
| char buf[512]; |
| ssize_t n; |
| |
| snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); |
| |
| n = readlink(path, buf, sizeof(buf)); |
| if (n < 0) { |
| p_err("can't read link type: %s", strerror(errno)); |
| return -1; |
| } |
| if (n == sizeof(path)) { |
| p_err("can't read link type: path too long!"); |
| return -1; |
| } |
| |
| if (strstr(buf, "bpf-map")) |
| return BPF_OBJ_MAP; |
| else if (strstr(buf, "bpf-prog")) |
| return BPF_OBJ_PROG; |
| else if (strstr(buf, "bpf-link")) |
| return BPF_OBJ_LINK; |
| |
| return BPF_OBJ_UNKNOWN; |
| } |
| |
| char *get_fdinfo(int fd, const char *key) |
| { |
| char path[PATH_MAX]; |
| char *line = NULL; |
| size_t line_n = 0; |
| ssize_t n; |
| FILE *fdi; |
| |
| snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); |
| |
| fdi = fopen(path, "r"); |
| if (!fdi) |
| return NULL; |
| |
| while ((n = getline(&line, &line_n, fdi)) > 0) { |
| char *value; |
| int len; |
| |
| if (!strstr(line, key)) |
| continue; |
| |
| fclose(fdi); |
| |
| value = strchr(line, '\t'); |
| if (!value || !value[1]) { |
| free(line); |
| return NULL; |
| } |
| value++; |
| |
| len = strlen(value); |
| memmove(line, value, len); |
| line[len - 1] = '\0'; |
| |
| return line; |
| } |
| |
| free(line); |
| fclose(fdi); |
| return NULL; |
| } |
| |
| void print_data_json(uint8_t *data, size_t len) |
| { |
| unsigned int i; |
| |
| jsonw_start_array(json_wtr); |
| for (i = 0; i < len; i++) |
| jsonw_printf(json_wtr, "%d", data[i]); |
| jsonw_end_array(json_wtr); |
| } |
| |
| void print_hex_data_json(uint8_t *data, size_t len) |
| { |
| unsigned int i; |
| |
| jsonw_start_array(json_wtr); |
| for (i = 0; i < len; i++) |
| jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); |
| jsonw_end_array(json_wtr); |
| } |
| |
| /* extra params for nftw cb */ |
| static struct hashmap *build_fn_table; |
| static enum bpf_obj_type build_fn_type; |
| |
| static int do_build_table_cb(const char *fpath, const struct stat *sb, |
| int typeflag, struct FTW *ftwbuf) |
| { |
| struct bpf_prog_info pinned_info; |
| __u32 len = sizeof(pinned_info); |
| enum bpf_obj_type objtype; |
| int fd, err = 0; |
| char *path; |
| |
| if (typeflag != FTW_F) |
| goto out_ret; |
| |
| fd = open_obj_pinned(fpath, true); |
| if (fd < 0) |
| goto out_ret; |
| |
| objtype = get_fd_type(fd); |
| if (objtype != build_fn_type) |
| goto out_close; |
| |
| memset(&pinned_info, 0, sizeof(pinned_info)); |
| if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len)) |
| goto out_close; |
| |
| path = strdup(fpath); |
| if (!path) { |
| err = -1; |
| goto out_close; |
| } |
| |
| err = hashmap__append(build_fn_table, pinned_info.id, path); |
| if (err) { |
| p_err("failed to append entry to hashmap for ID %u, path '%s': %s", |
| pinned_info.id, path, strerror(errno)); |
| goto out_close; |
| } |
| |
| out_close: |
| close(fd); |
| out_ret: |
| return err; |
| } |
| |
| int build_pinned_obj_table(struct hashmap *tab, |
| enum bpf_obj_type type) |
| { |
| struct mntent *mntent = NULL; |
| FILE *mntfile = NULL; |
| int flags = FTW_PHYS; |
| int nopenfd = 16; |
| int err = 0; |
| |
| mntfile = setmntent("/proc/mounts", "r"); |
| if (!mntfile) |
| return -1; |
| |
| build_fn_table = tab; |
| build_fn_type = type; |
| |
| while ((mntent = getmntent(mntfile))) { |
| char *path = mntent->mnt_dir; |
| |
| if (strncmp(mntent->mnt_type, "bpf", 3) != 0) |
| continue; |
| err = nftw(path, do_build_table_cb, nopenfd, flags); |
| if (err) |
| break; |
| } |
| fclose(mntfile); |
| return err; |
| } |
| |
| void delete_pinned_obj_table(struct hashmap *map) |
| { |
| struct hashmap_entry *entry; |
| size_t bkt; |
| |
| if (!map) |
| return; |
| |
| hashmap__for_each_entry(map, entry, bkt) |
| free(entry->pvalue); |
| |
| hashmap__free(map); |
| } |
| |
| unsigned int get_page_size(void) |
| { |
| static int result; |
| |
| if (!result) |
| result = getpagesize(); |
| return result; |
| } |
| |
| unsigned int get_possible_cpus(void) |
| { |
| int cpus = libbpf_num_possible_cpus(); |
| |
| if (cpus < 0) { |
| p_err("Can't get # of possible cpus: %s", strerror(-cpus)); |
| exit(-1); |
| } |
| return cpus; |
| } |
| |
| static char * |
| ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) |
| { |
| struct stat st; |
| int err; |
| |
| err = stat("/proc/self/ns/net", &st); |
| if (err) { |
| p_err("Can't stat /proc/self: %s", strerror(errno)); |
| return NULL; |
| } |
| |
| if (st.st_dev != ns_dev || st.st_ino != ns_ino) |
| return NULL; |
| |
| return if_indextoname(ifindex, buf); |
| } |
| |
| static int read_sysfs_hex_int(char *path) |
| { |
| char vendor_id_buf[8]; |
| int len; |
| int fd; |
| |
| fd = open(path, O_RDONLY); |
| if (fd < 0) { |
| p_err("Can't open %s: %s", path, strerror(errno)); |
| return -1; |
| } |
| |
| len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); |
| close(fd); |
| if (len < 0) { |
| p_err("Can't read %s: %s", path, strerror(errno)); |
| return -1; |
| } |
| if (len >= (int)sizeof(vendor_id_buf)) { |
| p_err("Value in %s too long", path); |
| return -1; |
| } |
| |
| vendor_id_buf[len] = 0; |
| |
| return strtol(vendor_id_buf, NULL, 0); |
| } |
| |
| static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) |
| { |
| char full_path[64]; |
| |
| snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", |
| devname, entry_name); |
| |
| return read_sysfs_hex_int(full_path); |
| } |
| |
| const char * |
| ifindex_to_arch(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, const char **opt) |
| { |
| __maybe_unused int device_id; |
| char devname[IF_NAMESIZE]; |
| int vendor_id; |
| |
| if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { |
| p_err("Can't get net device name for ifindex %d: %s", ifindex, |
| strerror(errno)); |
| return NULL; |
| } |
| |
| vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); |
| if (vendor_id < 0) { |
| p_err("Can't get device vendor id for %s", devname); |
| return NULL; |
| } |
| |
| switch (vendor_id) { |
| #ifdef HAVE_LIBBFD_SUPPORT |
| case 0x19ee: |
| device_id = read_sysfs_netdev_hex_int(devname, "device"); |
| if (device_id != 0x4000 && |
| device_id != 0x6000 && |
| device_id != 0x6003) |
| p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); |
| *opt = "ctx4"; |
| return "NFP-6xxx"; |
| #endif /* HAVE_LIBBFD_SUPPORT */ |
| /* No NFP support in LLVM, we have no valid triple to return. */ |
| default: |
| p_err("Can't get arch name for device vendor id 0x%04x", |
| vendor_id); |
| return NULL; |
| } |
| } |
| |
| void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) |
| { |
| char name[IF_NAMESIZE]; |
| |
| if (!ifindex) |
| return; |
| |
| printf(" offloaded_to "); |
| if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) |
| printf("%s", name); |
| else |
| printf("ifindex %u ns_dev %llu ns_ino %llu", |
| ifindex, ns_dev, ns_inode); |
| } |
| |
| void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) |
| { |
| 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) |
| { |
| char prog_name[MAX_PROG_FULL_NAME]; |
| 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)) { |
| close(fd); |
| continue; |
| } |
| |
| if (!tag) { |
| get_prog_full_name(&info, fd, prog_name, |
| sizeof(prog_name)); |
| if (strncmp(nametag, prog_name, sizeof(prog_name))) { |
| 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) > MAX_PROG_FULL_NAME - 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; |
| } |
| |
| size_t hash_fn_for_key_as_id(long key, void *ctx) |
| { |
| return key; |
| } |
| |
| bool equal_fn_for_key_as_id(long k1, long k2, void *ctx) |
| { |
| return k1 == k2; |
| } |
| |
| const char *bpf_attach_type_input_str(enum bpf_attach_type t) |
| { |
| switch (t) { |
| case BPF_CGROUP_INET_INGRESS: return "ingress"; |
| case BPF_CGROUP_INET_EGRESS: return "egress"; |
| case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create"; |
| case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release"; |
| case BPF_CGROUP_SOCK_OPS: return "sock_ops"; |
| case BPF_CGROUP_DEVICE: return "device"; |
| case BPF_CGROUP_INET4_BIND: return "bind4"; |
| case BPF_CGROUP_INET6_BIND: return "bind6"; |
| case BPF_CGROUP_INET4_CONNECT: return "connect4"; |
| case BPF_CGROUP_INET6_CONNECT: return "connect6"; |
| case BPF_CGROUP_INET4_POST_BIND: return "post_bind4"; |
| case BPF_CGROUP_INET6_POST_BIND: return "post_bind6"; |
| case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4"; |
| case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6"; |
| case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4"; |
| case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6"; |
| case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4"; |
| case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6"; |
| case BPF_CGROUP_SYSCTL: return "sysctl"; |
| case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4"; |
| case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6"; |
| case BPF_CGROUP_GETSOCKOPT: return "getsockopt"; |
| case BPF_CGROUP_SETSOCKOPT: return "setsockopt"; |
| case BPF_TRACE_RAW_TP: return "raw_tp"; |
| case BPF_TRACE_FENTRY: return "fentry"; |
| case BPF_TRACE_FEXIT: return "fexit"; |
| case BPF_MODIFY_RETURN: return "mod_ret"; |
| case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select"; |
| case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate"; |
| default: return libbpf_bpf_attach_type_str(t); |
| } |
| } |