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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235// SPDX-License-Identifier: GPL-2.0-only/* Copyright (c) 2020 Facebook */#include <linux/bpf.h>#include <linux/fs.h>#include <linux/filter.h>#include <linux/kernel.h>#include <linux/btf_ids.h>
struct bpf_iter_seq_map_info { u32 map_id;};
static void *bpf_map_seq_start(struct seq_file *seq, loff_t *pos){ struct bpf_iter_seq_map_info *info = seq->private; struct bpf_map *map;
map = bpf_map_get_curr_or_next(&info->map_id); if (!map) return NULL;
if (*pos == 0) ++*pos; return map;}
static void *bpf_map_seq_next(struct seq_file *seq, void *v, loff_t *pos){ struct bpf_iter_seq_map_info *info = seq->private;
++*pos; ++info->map_id; bpf_map_put((struct bpf_map *)v); return bpf_map_get_curr_or_next(&info->map_id);}
struct bpf_iter__bpf_map { __bpf_md_ptr(struct bpf_iter_meta *, meta); __bpf_md_ptr(struct bpf_map *, map);};
DEFINE_BPF_ITER_FUNC(bpf_map, struct bpf_iter_meta *meta, struct bpf_map *map)
static int __bpf_map_seq_show(struct seq_file *seq, void *v, bool in_stop){ struct bpf_iter__bpf_map ctx; struct bpf_iter_meta meta; struct bpf_prog *prog; int ret = 0;
ctx.meta = &meta; ctx.map = v; meta.seq = seq; prog = bpf_iter_get_info(&meta, in_stop); if (prog) ret = bpf_iter_run_prog(prog, &ctx);
return ret;}
static int bpf_map_seq_show(struct seq_file *seq, void *v){ return __bpf_map_seq_show(seq, v, false);}
static void bpf_map_seq_stop(struct seq_file *seq, void *v){ if (!v) (void)__bpf_map_seq_show(seq, v, true); else bpf_map_put((struct bpf_map *)v);}
static const struct seq_operations bpf_map_seq_ops = { .start = bpf_map_seq_start, .next = bpf_map_seq_next, .stop = bpf_map_seq_stop, .show = bpf_map_seq_show,};
BTF_ID_LIST_GLOBAL_SINGLE(btf_bpf_map_id, struct, bpf_map)
static const struct bpf_iter_seq_info bpf_map_seq_info = { .seq_ops = &bpf_map_seq_ops, .init_seq_private = NULL, .fini_seq_private = NULL, .seq_priv_size = sizeof(struct bpf_iter_seq_map_info),};
static struct bpf_iter_reg bpf_map_reg_info = { .target = "bpf_map", .ctx_arg_info_size = 1, .ctx_arg_info = { { offsetof(struct bpf_iter__bpf_map, map), PTR_TO_BTF_ID_OR_NULL | PTR_TRUSTED }, }, .seq_info = &bpf_map_seq_info,};
static int bpf_iter_attach_map(struct bpf_prog *prog, union bpf_iter_link_info *linfo, struct bpf_iter_aux_info *aux){ u32 key_acc_size, value_acc_size, key_size, value_size; struct bpf_map *map; bool is_percpu = false; int err = -EINVAL;
if (!linfo->map.map_fd) return -EBADF;
map = bpf_map_get_with_uref(linfo->map.map_fd); if (IS_ERR(map)) return PTR_ERR(map); if (map->excl_prog_sha) { err = -EPERM; goto put_map; }
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) is_percpu = true; else if (map->map_type != BPF_MAP_TYPE_HASH && map->map_type != BPF_MAP_TYPE_LRU_HASH && map->map_type != BPF_MAP_TYPE_ARRAY && map->map_type != BPF_MAP_TYPE_RHASH) goto put_map;
key_acc_size = prog->aux->max_rdonly_access; value_acc_size = prog->aux->max_rdwr_access; key_size = map->key_size; if (!is_percpu) value_size = map->value_size; else value_size = round_up(map->value_size, 8) * num_possible_cpus();
if (key_acc_size > key_size || value_acc_size > value_size) { err = -EACCES; goto put_map; }
aux->map = map; return 0;
put_map: bpf_map_put_with_uref(map); return err;}
static void bpf_iter_detach_map(struct bpf_iter_aux_info *aux){ bpf_map_put_with_uref(aux->map);}
void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux, struct seq_file *seq){ seq_printf(seq, "map_id:\t%u\n", aux->map->id);}
int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux, struct bpf_link_info *info){ info->iter.map.map_id = aux->map->id; return 0;}
DEFINE_BPF_ITER_FUNC(bpf_map_elem, struct bpf_iter_meta *meta, struct bpf_map *map, void *key, void *value)
static const struct bpf_iter_reg bpf_map_elem_reg_info = { .target = "bpf_map_elem", .attach_target = bpf_iter_attach_map, .detach_target = bpf_iter_detach_map, .show_fdinfo = bpf_iter_map_show_fdinfo, .fill_link_info = bpf_iter_map_fill_link_info, .ctx_arg_info_size = 2, .ctx_arg_info = { { offsetof(struct bpf_iter__bpf_map_elem, key), PTR_TO_BUF | PTR_MAYBE_NULL | MEM_RDONLY }, { offsetof(struct bpf_iter__bpf_map_elem, value), PTR_TO_BUF | PTR_MAYBE_NULL }, },};
static int __init bpf_map_iter_init(void){ int ret;
bpf_map_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_map_id; ret = bpf_iter_reg_target(&bpf_map_reg_info); if (ret) return ret;
return bpf_iter_reg_target(&bpf_map_elem_reg_info);}
late_initcall(bpf_map_iter_init);
__bpf_kfunc_start_defs();
__bpf_kfunc s64 bpf_map_sum_elem_count(const struct bpf_map *map){ s64 *pcount; s64 ret = 0; int cpu;
if (!map || !map->elem_count) return 0;
for_each_possible_cpu(cpu) { pcount = per_cpu_ptr(map->elem_count, cpu); ret += READ_ONCE(*pcount); } return ret;}
__bpf_kfunc_end_defs();
BTF_KFUNCS_START(bpf_map_iter_kfunc_ids)BTF_ID_FLAGS(func, bpf_map_sum_elem_count)BTF_KFUNCS_END(bpf_map_iter_kfunc_ids)
static const struct btf_kfunc_id_set bpf_map_iter_kfunc_set = { .owner = THIS_MODULE, .set = &bpf_map_iter_kfunc_ids,};
static int init_subsystem(void){ return register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, &bpf_map_iter_kfunc_set);}late_initcall(init_subsystem);