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- // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
- /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
- #define _GNU_SOURCE
- #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, u32_as_hash_field(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));
- free(path);
- 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->value);
- 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_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
- const char **opt)
- {
- char devname[IF_NAMESIZE];
- int vendor_id;
- int device_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) {
- 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";
- default:
- p_err("Can't get bfd 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(const void *key, void *ctx)
- {
- return (size_t)key;
- }
- bool equal_fn_for_key_as_id(const void *k1, const void *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);
- }
- }
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