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bpf: Add bpf_map iterator
Implement seq_file operations to traverse all bpf_maps. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200509175909.2476096-1-yhs@fb.com
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@ -1082,6 +1082,7 @@ int generic_map_update_batch(struct bpf_map *map,
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int generic_map_delete_batch(struct bpf_map *map,
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const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
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extern int sysctl_unprivileged_bpf_disabled;
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@ -2,7 +2,7 @@
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obj-y := core.o
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CFLAGS_core.o += $(call cc-disable-warning, override-init)
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obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o
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obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o map_iter.o
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obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o percpu_freelist.o bpf_lru_list.o lpm_trie.o map_in_map.o
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obj-$(CONFIG_BPF_SYSCALL) += local_storage.o queue_stack_maps.o
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obj-$(CONFIG_BPF_SYSCALL) += disasm.o
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97
kernel/bpf/map_iter.c
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97
kernel/bpf/map_iter.c
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@ -0,0 +1,97 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2020 Facebook */
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#include <linux/bpf.h>
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#include <linux/fs.h>
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#include <linux/filter.h>
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#include <linux/kernel.h>
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struct bpf_iter_seq_map_info {
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u32 mid;
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};
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static void *bpf_map_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct bpf_iter_seq_map_info *info = seq->private;
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struct bpf_map *map;
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map = bpf_map_get_curr_or_next(&info->mid);
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if (!map)
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return NULL;
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++*pos;
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return map;
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}
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static void *bpf_map_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct bpf_iter_seq_map_info *info = seq->private;
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struct bpf_map *map;
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++*pos;
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++info->mid;
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bpf_map_put((struct bpf_map *)v);
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map = bpf_map_get_curr_or_next(&info->mid);
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if (!map)
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return NULL;
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return map;
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}
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struct bpf_iter__bpf_map {
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__bpf_md_ptr(struct bpf_iter_meta *, meta);
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__bpf_md_ptr(struct bpf_map *, map);
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};
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DEFINE_BPF_ITER_FUNC(bpf_map, struct bpf_iter_meta *meta, struct bpf_map *map)
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static int __bpf_map_seq_show(struct seq_file *seq, void *v, bool in_stop)
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{
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struct bpf_iter__bpf_map ctx;
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struct bpf_iter_meta meta;
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struct bpf_prog *prog;
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int ret = 0;
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ctx.meta = &meta;
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ctx.map = v;
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meta.seq = seq;
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prog = bpf_iter_get_info(&meta, in_stop);
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if (prog)
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ret = bpf_iter_run_prog(prog, &ctx);
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return ret;
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}
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static int bpf_map_seq_show(struct seq_file *seq, void *v)
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{
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return __bpf_map_seq_show(seq, v, false);
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}
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static void bpf_map_seq_stop(struct seq_file *seq, void *v)
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{
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if (!v)
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(void)__bpf_map_seq_show(seq, v, true);
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else
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bpf_map_put((struct bpf_map *)v);
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}
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static const struct seq_operations bpf_map_seq_ops = {
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.start = bpf_map_seq_start,
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.next = bpf_map_seq_next,
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.stop = bpf_map_seq_stop,
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.show = bpf_map_seq_show,
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};
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static int __init bpf_map_iter_init(void)
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{
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struct bpf_iter_reg reg_info = {
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.target = "bpf_map",
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.seq_ops = &bpf_map_seq_ops,
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.init_seq_private = NULL,
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.fini_seq_private = NULL,
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.seq_priv_size = sizeof(struct bpf_iter_seq_map_info),
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};
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return bpf_iter_reg_target(®_info);
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}
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late_initcall(bpf_map_iter_init);
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@ -2934,6 +2934,25 @@ static int bpf_obj_get_next_id(const union bpf_attr *attr,
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return err;
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}
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struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
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{
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struct bpf_map *map;
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spin_lock_bh(&map_idr_lock);
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again:
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map = idr_get_next(&map_idr, id);
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if (map) {
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map = __bpf_map_inc_not_zero(map, false);
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if (IS_ERR(map)) {
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(*id)++;
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goto again;
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}
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}
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spin_unlock_bh(&map_idr_lock);
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return map;
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}
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#define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
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struct bpf_prog *bpf_prog_by_id(u32 id)
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