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423 lines
9.1 KiB
423 lines
9.1 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 <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 "json_writer.h" |
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#include "main.h" |
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static const char * const link_type_name[] = { |
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[BPF_LINK_TYPE_UNSPEC] = "unspec", |
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[BPF_LINK_TYPE_RAW_TRACEPOINT] = "raw_tracepoint", |
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[BPF_LINK_TYPE_TRACING] = "tracing", |
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[BPF_LINK_TYPE_CGROUP] = "cgroup", |
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[BPF_LINK_TYPE_ITER] = "iter", |
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[BPF_LINK_TYPE_NETNS] = "netns", |
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}; |
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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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jsonw_uint_field(wtr, "id", info->id); |
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if (info->type < ARRAY_SIZE(link_type_name)) |
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jsonw_string_field(wtr, "type", link_type_name[info->type]); |
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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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if (attach_type < ARRAY_SIZE(attach_type_name)) |
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jsonw_string_field(wtr, "attach_type", |
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attach_type_name[attach_type]); |
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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 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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} |
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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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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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if (prog_info.type < prog_type_name_size) |
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jsonw_string_field(json_wtr, "prog_type", |
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prog_type_name[prog_info.type]); |
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else |
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jsonw_uint_field(json_wtr, "prog_type", |
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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 (!hash_empty(link_table.table)) { |
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struct pinned_obj *obj; |
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jsonw_name(json_wtr, "pinned"); |
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jsonw_start_array(json_wtr); |
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hash_for_each_possible(link_table.table, obj, hash, info->id) { |
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if (obj->id == info->id) |
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jsonw_string(json_wtr, obj->path); |
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} |
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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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printf("%u: ", info->id); |
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if (info->type < ARRAY_SIZE(link_type_name)) |
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printf("%s ", link_type_name[info->type]); |
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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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if (attach_type < ARRAY_SIZE(attach_type_name)) |
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printf("attach_type %s ", attach_type_name[attach_type]); |
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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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} |
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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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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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if (prog_info.type < prog_type_name_size) |
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printf("\n\tprog_type %s ", |
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prog_type_name[prog_info.type]); |
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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 (!hash_empty(link_table.table)) { |
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struct pinned_obj *obj; |
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hash_for_each_possible(link_table.table, obj, hash, info->id) { |
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if (obj->id == info->id) |
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printf("\n\tpinned %s", obj->path); |
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} |
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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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build_pinned_obj_table(&link_table, BPF_OBJ_LINK); |
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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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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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"", |
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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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