1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// 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(btf_bpf_map_id)
BTF_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 },
},
.seq_info = &bpf_map_seq_info,
};
static int bpf_iter_check_map(struct bpf_prog *prog,
struct bpf_iter_aux_info *aux)
{
u32 key_acc_size, value_acc_size, key_size, value_size;
struct bpf_map *map = aux->map;
bool is_percpu = false;
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)
return -EINVAL;
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)
return -EACCES;
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",
.check_target = bpf_iter_check_map,
.req_linfo = BPF_ITER_LINK_MAP_FD,
.ctx_arg_info_size = 2,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__bpf_map_elem, key),
PTR_TO_RDONLY_BUF_OR_NULL },
{ offsetof(struct bpf_iter__bpf_map_elem, value),
PTR_TO_RDWR_BUF_OR_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);
|
