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495 lines
11 KiB
495 lines
11 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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/* Copyright (C) 2020 Facebook */ |
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#include <errno.h> |
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#include <linux/err.h> |
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#include <net/if.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <bpf/bpf.h> |
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#include <bpf/hashmap.h> |
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#include "json_writer.h" |
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#include "main.h" |
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static struct hashmap *link_table; |
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static int link_parse_fd(int *argc, char ***argv) |
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{ |
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int fd; |
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if (is_prefix(**argv, "id")) { |
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unsigned int id; |
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char *endptr; |
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NEXT_ARGP(); |
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id = strtoul(**argv, &endptr, 0); |
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if (*endptr) { |
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p_err("can't parse %s as ID", **argv); |
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return -1; |
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} |
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NEXT_ARGP(); |
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fd = bpf_link_get_fd_by_id(id); |
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if (fd < 0) |
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p_err("failed to get link with ID %d: %s", id, strerror(errno)); |
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return fd; |
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} else if (is_prefix(**argv, "pinned")) { |
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char *path; |
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NEXT_ARGP(); |
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path = **argv; |
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NEXT_ARGP(); |
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return open_obj_pinned_any(path, BPF_OBJ_LINK); |
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} |
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p_err("expected 'id' or 'pinned', got: '%s'?", **argv); |
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return -1; |
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} |
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static void |
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show_link_header_json(struct bpf_link_info *info, json_writer_t *wtr) |
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{ |
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const char *link_type_str; |
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jsonw_uint_field(wtr, "id", info->id); |
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link_type_str = libbpf_bpf_link_type_str(info->type); |
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if (link_type_str) |
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jsonw_string_field(wtr, "type", link_type_str); |
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else |
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jsonw_uint_field(wtr, "type", info->type); |
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jsonw_uint_field(json_wtr, "prog_id", info->prog_id); |
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} |
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static void show_link_attach_type_json(__u32 attach_type, json_writer_t *wtr) |
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{ |
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const char *attach_type_str; |
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attach_type_str = libbpf_bpf_attach_type_str(attach_type); |
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if (attach_type_str) |
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jsonw_string_field(wtr, "attach_type", attach_type_str); |
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else |
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jsonw_uint_field(wtr, "attach_type", attach_type); |
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} |
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static bool is_iter_map_target(const char *target_name) |
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{ |
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return strcmp(target_name, "bpf_map_elem") == 0 || |
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strcmp(target_name, "bpf_sk_storage_map") == 0; |
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} |
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static bool is_iter_cgroup_target(const char *target_name) |
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{ |
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return strcmp(target_name, "cgroup") == 0; |
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} |
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static const char *cgroup_order_string(__u32 order) |
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{ |
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switch (order) { |
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case BPF_CGROUP_ITER_ORDER_UNSPEC: |
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return "order_unspec"; |
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case BPF_CGROUP_ITER_SELF_ONLY: |
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return "self_only"; |
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case BPF_CGROUP_ITER_DESCENDANTS_PRE: |
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return "descendants_pre"; |
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case BPF_CGROUP_ITER_DESCENDANTS_POST: |
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return "descendants_post"; |
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case BPF_CGROUP_ITER_ANCESTORS_UP: |
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return "ancestors_up"; |
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default: /* won't happen */ |
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return "unknown"; |
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} |
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} |
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static bool is_iter_task_target(const char *target_name) |
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{ |
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return strcmp(target_name, "task") == 0 || |
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strcmp(target_name, "task_file") == 0 || |
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strcmp(target_name, "task_vma") == 0; |
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} |
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static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr) |
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{ |
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const char *target_name = u64_to_ptr(info->iter.target_name); |
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jsonw_string_field(wtr, "target_name", target_name); |
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if (is_iter_map_target(target_name)) |
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jsonw_uint_field(wtr, "map_id", info->iter.map.map_id); |
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else if (is_iter_task_target(target_name)) { |
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if (info->iter.task.tid) |
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jsonw_uint_field(wtr, "tid", info->iter.task.tid); |
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else if (info->iter.task.pid) |
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jsonw_uint_field(wtr, "pid", info->iter.task.pid); |
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} |
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if (is_iter_cgroup_target(target_name)) { |
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jsonw_lluint_field(wtr, "cgroup_id", info->iter.cgroup.cgroup_id); |
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jsonw_string_field(wtr, "order", |
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cgroup_order_string(info->iter.cgroup.order)); |
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} |
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} |
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static int get_prog_info(int prog_id, struct bpf_prog_info *info) |
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{ |
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__u32 len = sizeof(*info); |
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int err, prog_fd; |
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prog_fd = bpf_prog_get_fd_by_id(prog_id); |
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if (prog_fd < 0) |
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return prog_fd; |
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memset(info, 0, sizeof(*info)); |
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err = bpf_obj_get_info_by_fd(prog_fd, info, &len); |
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if (err) |
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p_err("can't get prog info: %s", strerror(errno)); |
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close(prog_fd); |
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return err; |
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} |
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static int show_link_close_json(int fd, struct bpf_link_info *info) |
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{ |
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struct bpf_prog_info prog_info; |
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const char *prog_type_str; |
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int err; |
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jsonw_start_object(json_wtr); |
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show_link_header_json(info, json_wtr); |
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switch (info->type) { |
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case BPF_LINK_TYPE_RAW_TRACEPOINT: |
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jsonw_string_field(json_wtr, "tp_name", |
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u64_to_ptr(info->raw_tracepoint.tp_name)); |
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break; |
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case BPF_LINK_TYPE_TRACING: |
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err = get_prog_info(info->prog_id, &prog_info); |
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if (err) |
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return err; |
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prog_type_str = libbpf_bpf_prog_type_str(prog_info.type); |
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/* libbpf will return NULL for variants unknown to it. */ |
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if (prog_type_str) |
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jsonw_string_field(json_wtr, "prog_type", prog_type_str); |
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else |
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jsonw_uint_field(json_wtr, "prog_type", prog_info.type); |
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show_link_attach_type_json(info->tracing.attach_type, |
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json_wtr); |
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break; |
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case BPF_LINK_TYPE_CGROUP: |
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jsonw_lluint_field(json_wtr, "cgroup_id", |
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info->cgroup.cgroup_id); |
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show_link_attach_type_json(info->cgroup.attach_type, json_wtr); |
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break; |
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case BPF_LINK_TYPE_ITER: |
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show_iter_json(info, json_wtr); |
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break; |
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case BPF_LINK_TYPE_NETNS: |
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jsonw_uint_field(json_wtr, "netns_ino", |
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info->netns.netns_ino); |
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show_link_attach_type_json(info->netns.attach_type, json_wtr); |
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break; |
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default: |
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break; |
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} |
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if (!hashmap__empty(link_table)) { |
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struct hashmap_entry *entry; |
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jsonw_name(json_wtr, "pinned"); |
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jsonw_start_array(json_wtr); |
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hashmap__for_each_key_entry(link_table, entry, |
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u32_as_hash_field(info->id)) |
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jsonw_string(json_wtr, entry->value); |
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jsonw_end_array(json_wtr); |
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} |
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emit_obj_refs_json(refs_table, info->id, json_wtr); |
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jsonw_end_object(json_wtr); |
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return 0; |
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} |
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static void show_link_header_plain(struct bpf_link_info *info) |
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{ |
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const char *link_type_str; |
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printf("%u: ", info->id); |
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link_type_str = libbpf_bpf_link_type_str(info->type); |
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if (link_type_str) |
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printf("%s ", link_type_str); |
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else |
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printf("type %u ", info->type); |
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printf("prog %u ", info->prog_id); |
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} |
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static void show_link_attach_type_plain(__u32 attach_type) |
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{ |
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const char *attach_type_str; |
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attach_type_str = libbpf_bpf_attach_type_str(attach_type); |
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if (attach_type_str) |
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printf("attach_type %s ", attach_type_str); |
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else |
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printf("attach_type %u ", attach_type); |
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} |
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static void show_iter_plain(struct bpf_link_info *info) |
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{ |
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const char *target_name = u64_to_ptr(info->iter.target_name); |
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printf("target_name %s ", target_name); |
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if (is_iter_map_target(target_name)) |
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printf("map_id %u ", info->iter.map.map_id); |
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else if (is_iter_task_target(target_name)) { |
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if (info->iter.task.tid) |
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printf("tid %u ", info->iter.task.tid); |
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else if (info->iter.task.pid) |
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printf("pid %u ", info->iter.task.pid); |
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} |
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if (is_iter_cgroup_target(target_name)) { |
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printf("cgroup_id %llu ", info->iter.cgroup.cgroup_id); |
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printf("order %s ", |
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cgroup_order_string(info->iter.cgroup.order)); |
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} |
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} |
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static int show_link_close_plain(int fd, struct bpf_link_info *info) |
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{ |
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struct bpf_prog_info prog_info; |
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const char *prog_type_str; |
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int err; |
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show_link_header_plain(info); |
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switch (info->type) { |
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case BPF_LINK_TYPE_RAW_TRACEPOINT: |
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printf("\n\ttp '%s' ", |
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(const char *)u64_to_ptr(info->raw_tracepoint.tp_name)); |
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break; |
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case BPF_LINK_TYPE_TRACING: |
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err = get_prog_info(info->prog_id, &prog_info); |
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if (err) |
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return err; |
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prog_type_str = libbpf_bpf_prog_type_str(prog_info.type); |
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/* libbpf will return NULL for variants unknown to it. */ |
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if (prog_type_str) |
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printf("\n\tprog_type %s ", prog_type_str); |
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else |
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printf("\n\tprog_type %u ", prog_info.type); |
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show_link_attach_type_plain(info->tracing.attach_type); |
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break; |
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case BPF_LINK_TYPE_CGROUP: |
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printf("\n\tcgroup_id %zu ", (size_t)info->cgroup.cgroup_id); |
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show_link_attach_type_plain(info->cgroup.attach_type); |
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break; |
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case BPF_LINK_TYPE_ITER: |
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show_iter_plain(info); |
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break; |
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case BPF_LINK_TYPE_NETNS: |
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printf("\n\tnetns_ino %u ", info->netns.netns_ino); |
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show_link_attach_type_plain(info->netns.attach_type); |
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break; |
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default: |
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break; |
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} |
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if (!hashmap__empty(link_table)) { |
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struct hashmap_entry *entry; |
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hashmap__for_each_key_entry(link_table, entry, |
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u32_as_hash_field(info->id)) |
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printf("\n\tpinned %s", (char *)entry->value); |
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} |
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emit_obj_refs_plain(refs_table, info->id, "\n\tpids "); |
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printf("\n"); |
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return 0; |
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} |
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static int do_show_link(int fd) |
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{ |
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struct bpf_link_info info; |
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__u32 len = sizeof(info); |
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char buf[256]; |
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int err; |
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memset(&info, 0, sizeof(info)); |
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again: |
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err = bpf_obj_get_info_by_fd(fd, &info, &len); |
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if (err) { |
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p_err("can't get link info: %s", |
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strerror(errno)); |
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close(fd); |
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return err; |
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} |
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if (info.type == BPF_LINK_TYPE_RAW_TRACEPOINT && |
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!info.raw_tracepoint.tp_name) { |
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info.raw_tracepoint.tp_name = (unsigned long)&buf; |
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info.raw_tracepoint.tp_name_len = sizeof(buf); |
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goto again; |
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} |
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if (info.type == BPF_LINK_TYPE_ITER && |
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!info.iter.target_name) { |
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info.iter.target_name = (unsigned long)&buf; |
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info.iter.target_name_len = sizeof(buf); |
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goto again; |
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} |
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if (json_output) |
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show_link_close_json(fd, &info); |
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else |
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show_link_close_plain(fd, &info); |
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close(fd); |
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return 0; |
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} |
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static int do_show(int argc, char **argv) |
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{ |
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__u32 id = 0; |
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int err, fd; |
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if (show_pinned) { |
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link_table = hashmap__new(hash_fn_for_key_as_id, |
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equal_fn_for_key_as_id, NULL); |
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if (IS_ERR(link_table)) { |
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p_err("failed to create hashmap for pinned paths"); |
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return -1; |
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} |
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build_pinned_obj_table(link_table, BPF_OBJ_LINK); |
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} |
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build_obj_refs_table(&refs_table, BPF_OBJ_LINK); |
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if (argc == 2) { |
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fd = link_parse_fd(&argc, &argv); |
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if (fd < 0) |
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return fd; |
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return do_show_link(fd); |
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} |
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if (argc) |
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return BAD_ARG(); |
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if (json_output) |
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jsonw_start_array(json_wtr); |
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while (true) { |
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err = bpf_link_get_next_id(id, &id); |
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if (err) { |
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if (errno == ENOENT) |
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break; |
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p_err("can't get next link: %s%s", strerror(errno), |
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errno == EINVAL ? " -- kernel too old?" : ""); |
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break; |
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} |
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fd = bpf_link_get_fd_by_id(id); |
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if (fd < 0) { |
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if (errno == ENOENT) |
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continue; |
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p_err("can't get link by id (%u): %s", |
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id, strerror(errno)); |
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break; |
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} |
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err = do_show_link(fd); |
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if (err) |
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break; |
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} |
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if (json_output) |
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jsonw_end_array(json_wtr); |
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delete_obj_refs_table(refs_table); |
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if (show_pinned) |
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delete_pinned_obj_table(link_table); |
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return errno == ENOENT ? 0 : -1; |
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} |
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static int do_pin(int argc, char **argv) |
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{ |
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int err; |
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err = do_pin_any(argc, argv, link_parse_fd); |
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if (!err && json_output) |
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jsonw_null(json_wtr); |
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return err; |
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} |
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static int do_detach(int argc, char **argv) |
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{ |
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int err, fd; |
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if (argc != 2) { |
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p_err("link specifier is invalid or missing\n"); |
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return 1; |
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} |
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fd = link_parse_fd(&argc, &argv); |
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if (fd < 0) |
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return 1; |
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err = bpf_link_detach(fd); |
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if (err) |
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err = -errno; |
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close(fd); |
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if (err) { |
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p_err("failed link detach: %s", strerror(-err)); |
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return 1; |
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} |
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if (json_output) |
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jsonw_null(json_wtr); |
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return 0; |
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} |
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static int do_help(int argc, char **argv) |
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{ |
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if (json_output) { |
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jsonw_null(json_wtr); |
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return 0; |
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} |
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fprintf(stderr, |
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"Usage: %1$s %2$s { show | list } [LINK]\n" |
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" %1$s %2$s pin LINK FILE\n" |
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" %1$s %2$s detach LINK\n" |
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" %1$s %2$s help\n" |
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"\n" |
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" " HELP_SPEC_LINK "\n" |
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" " HELP_SPEC_OPTIONS " |\n" |
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" {-f|--bpffs} | {-n|--nomount} }\n" |
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"", |
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bin_name, argv[-2]); |
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return 0; |
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} |
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static const struct cmd cmds[] = { |
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{ "show", do_show }, |
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{ "list", do_show }, |
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{ "help", do_help }, |
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{ "pin", do_pin }, |
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{ "detach", do_detach }, |
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{ 0 } |
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}; |
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int do_link(int argc, char **argv) |
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{ |
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return cmd_select(cmds, argc, argv, do_help); |
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}
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