2018-08-02 23:27:18 +02:00
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//SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf-cgroup.h>
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#include <linux/bpf.h>
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bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
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#include <linux/btf.h>
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2018-08-02 23:27:18 +02:00
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#include <linux/bug.h>
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#include <linux/filter.h>
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#include <linux/mm.h>
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
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#include <uapi/linux/btf.h>
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2018-08-02 23:27:18 +02:00
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2018-11-24 00:48:16 +01:00
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DEFINE_PER_CPU(struct bpf_cgroup_storage*, bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
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2018-08-02 23:27:19 +02:00
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2018-08-02 23:27:18 +02:00
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#ifdef CONFIG_CGROUP_BPF
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#define LOCAL_STORAGE_CREATE_FLAG_MASK \
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bpf: add program side {rd, wr}only support for maps
This work adds two new map creation flags BPF_F_RDONLY_PROG
and BPF_F_WRONLY_PROG in order to allow for read-only or
write-only BPF maps from a BPF program side.
Today we have BPF_F_RDONLY and BPF_F_WRONLY, but this only
applies to system call side, meaning the BPF program has full
read/write access to the map as usual while bpf(2) calls with
map fd can either only read or write into the map depending
on the flags. BPF_F_RDONLY_PROG and BPF_F_WRONLY_PROG allows
for the exact opposite such that verifier is going to reject
program loads if write into a read-only map or a read into a
write-only map is detected. For read-only map case also some
helpers are forbidden for programs that would alter the map
state such as map deletion, update, etc. As opposed to the two
BPF_F_RDONLY / BPF_F_WRONLY flags, BPF_F_RDONLY_PROG as well
as BPF_F_WRONLY_PROG really do correspond to the map lifetime.
We've enabled this generic map extension to various non-special
maps holding normal user data: array, hash, lru, lpm, local
storage, queue and stack. Further generic map types could be
followed up in future depending on use-case. Main use case
here is to forbid writes into .rodata map values from verifier
side.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-04-09 23:20:05 +02:00
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(BPF_F_NUMA_NODE | BPF_F_ACCESS_MASK)
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2018-08-02 23:27:18 +02:00
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struct bpf_cgroup_storage_map {
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struct bpf_map map;
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spinlock_t lock;
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struct bpf_prog *prog;
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struct rb_root root;
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struct list_head list;
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};
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static struct bpf_cgroup_storage_map *map_to_storage(struct bpf_map *map)
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{
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return container_of(map, struct bpf_cgroup_storage_map, map);
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}
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static int bpf_cgroup_storage_key_cmp(
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const struct bpf_cgroup_storage_key *key1,
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const struct bpf_cgroup_storage_key *key2)
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{
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if (key1->cgroup_inode_id < key2->cgroup_inode_id)
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return -1;
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else if (key1->cgroup_inode_id > key2->cgroup_inode_id)
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return 1;
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else if (key1->attach_type < key2->attach_type)
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return -1;
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else if (key1->attach_type > key2->attach_type)
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return 1;
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return 0;
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}
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static struct bpf_cgroup_storage *cgroup_storage_lookup(
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struct bpf_cgroup_storage_map *map, struct bpf_cgroup_storage_key *key,
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bool locked)
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{
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struct rb_root *root = &map->root;
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struct rb_node *node;
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if (!locked)
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spin_lock_bh(&map->lock);
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node = root->rb_node;
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while (node) {
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struct bpf_cgroup_storage *storage;
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storage = container_of(node, struct bpf_cgroup_storage, node);
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switch (bpf_cgroup_storage_key_cmp(key, &storage->key)) {
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case -1:
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node = node->rb_left;
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break;
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case 1:
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node = node->rb_right;
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break;
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default:
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if (!locked)
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spin_unlock_bh(&map->lock);
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return storage;
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}
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}
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if (!locked)
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spin_unlock_bh(&map->lock);
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return NULL;
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}
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static int cgroup_storage_insert(struct bpf_cgroup_storage_map *map,
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struct bpf_cgroup_storage *storage)
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{
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struct rb_root *root = &map->root;
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struct rb_node **new = &(root->rb_node), *parent = NULL;
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while (*new) {
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struct bpf_cgroup_storage *this;
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this = container_of(*new, struct bpf_cgroup_storage, node);
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parent = *new;
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switch (bpf_cgroup_storage_key_cmp(&storage->key, &this->key)) {
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case -1:
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new = &((*new)->rb_left);
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break;
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case 1:
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new = &((*new)->rb_right);
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break;
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default:
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return -EEXIST;
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}
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}
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rb_link_node(&storage->node, parent, new);
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rb_insert_color(&storage->node, root);
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return 0;
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}
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static void *cgroup_storage_lookup_elem(struct bpf_map *_map, void *_key)
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{
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struct bpf_cgroup_storage_map *map = map_to_storage(_map);
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struct bpf_cgroup_storage_key *key = _key;
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struct bpf_cgroup_storage *storage;
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storage = cgroup_storage_lookup(map, key, false);
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if (!storage)
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return NULL;
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return &READ_ONCE(storage->buf)->data[0];
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}
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static int cgroup_storage_update_elem(struct bpf_map *map, void *_key,
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void *value, u64 flags)
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{
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struct bpf_cgroup_storage_key *key = _key;
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struct bpf_cgroup_storage *storage;
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struct bpf_storage_buffer *new;
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2019-02-01 00:40:09 +01:00
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if (unlikely(flags & ~(BPF_F_LOCK | BPF_EXIST | BPF_NOEXIST)))
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return -EINVAL;
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if (unlikely(flags & BPF_NOEXIST))
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return -EINVAL;
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if (unlikely((flags & BPF_F_LOCK) &&
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!map_value_has_spin_lock(map)))
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2018-08-02 23:27:18 +02:00
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return -EINVAL;
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storage = cgroup_storage_lookup((struct bpf_cgroup_storage_map *)map,
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key, false);
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if (!storage)
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return -ENOENT;
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2019-02-01 00:40:09 +01:00
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if (flags & BPF_F_LOCK) {
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copy_map_value_locked(map, storage->buf->data, value, false);
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return 0;
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}
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2018-08-02 23:27:18 +02:00
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new = kmalloc_node(sizeof(struct bpf_storage_buffer) +
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2018-11-14 19:00:34 +01:00
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map->value_size,
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__GFP_ZERO | GFP_ATOMIC | __GFP_NOWARN,
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2018-08-02 23:27:18 +02:00
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map->numa_node);
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if (!new)
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return -ENOMEM;
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memcpy(&new->data[0], value, map->value_size);
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2019-02-01 00:40:05 +01:00
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check_and_init_map_lock(map, new->data);
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2018-08-02 23:27:18 +02:00
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new = xchg(&storage->buf, new);
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kfree_rcu(new, rcu);
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return 0;
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}
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2018-09-28 16:45:43 +02:00
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int bpf_percpu_cgroup_storage_copy(struct bpf_map *_map, void *_key,
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void *value)
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{
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struct bpf_cgroup_storage_map *map = map_to_storage(_map);
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struct bpf_cgroup_storage_key *key = _key;
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struct bpf_cgroup_storage *storage;
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int cpu, off = 0;
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u32 size;
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rcu_read_lock();
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storage = cgroup_storage_lookup(map, key, false);
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if (!storage) {
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rcu_read_unlock();
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return -ENOENT;
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}
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/* per_cpu areas are zero-filled and bpf programs can only
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* access 'value_size' of them, so copying rounded areas
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* will not leak any kernel data
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*/
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size = round_up(_map->value_size, 8);
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for_each_possible_cpu(cpu) {
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bpf_long_memcpy(value + off,
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per_cpu_ptr(storage->percpu_buf, cpu), size);
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off += size;
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}
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rcu_read_unlock();
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return 0;
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}
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int bpf_percpu_cgroup_storage_update(struct bpf_map *_map, void *_key,
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void *value, u64 map_flags)
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{
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struct bpf_cgroup_storage_map *map = map_to_storage(_map);
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struct bpf_cgroup_storage_key *key = _key;
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struct bpf_cgroup_storage *storage;
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int cpu, off = 0;
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u32 size;
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if (map_flags != BPF_ANY && map_flags != BPF_EXIST)
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return -EINVAL;
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rcu_read_lock();
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storage = cgroup_storage_lookup(map, key, false);
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if (!storage) {
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rcu_read_unlock();
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return -ENOENT;
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}
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/* the user space will provide round_up(value_size, 8) bytes that
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* will be copied into per-cpu area. bpf programs can only access
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* value_size of it. During lookup the same extra bytes will be
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* returned or zeros which were zero-filled by percpu_alloc,
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* so no kernel data leaks possible
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*/
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size = round_up(_map->value_size, 8);
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for_each_possible_cpu(cpu) {
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bpf_long_memcpy(per_cpu_ptr(storage->percpu_buf, cpu),
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value + off, size);
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off += size;
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}
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rcu_read_unlock();
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return 0;
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}
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2018-08-02 23:27:18 +02:00
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static int cgroup_storage_get_next_key(struct bpf_map *_map, void *_key,
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void *_next_key)
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{
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struct bpf_cgroup_storage_map *map = map_to_storage(_map);
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struct bpf_cgroup_storage_key *key = _key;
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struct bpf_cgroup_storage_key *next = _next_key;
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struct bpf_cgroup_storage *storage;
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spin_lock_bh(&map->lock);
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if (list_empty(&map->list))
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goto enoent;
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if (key) {
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storage = cgroup_storage_lookup(map, key, true);
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if (!storage)
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goto enoent;
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storage = list_next_entry(storage, list);
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if (!storage)
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goto enoent;
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} else {
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storage = list_first_entry(&map->list,
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struct bpf_cgroup_storage, list);
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}
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spin_unlock_bh(&map->lock);
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next->attach_type = storage->key.attach_type;
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next->cgroup_inode_id = storage->key.cgroup_inode_id;
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return 0;
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enoent:
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spin_unlock_bh(&map->lock);
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return -ENOENT;
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}
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static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
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{
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int numa_node = bpf_map_attr_numa_node(attr);
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struct bpf_cgroup_storage_map *map;
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2019-05-30 03:03:58 +02:00
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struct bpf_map_memory mem;
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2019-05-30 03:03:55 +02:00
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int ret;
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2018-08-02 23:27:18 +02:00
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if (attr->key_size != sizeof(struct bpf_cgroup_storage_key))
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return ERR_PTR(-EINVAL);
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2018-10-02 04:41:53 +02:00
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if (attr->value_size == 0)
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return ERR_PTR(-EINVAL);
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2018-08-02 23:27:18 +02:00
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if (attr->value_size > PAGE_SIZE)
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return ERR_PTR(-E2BIG);
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bpf: add program side {rd, wr}only support for maps
This work adds two new map creation flags BPF_F_RDONLY_PROG
and BPF_F_WRONLY_PROG in order to allow for read-only or
write-only BPF maps from a BPF program side.
Today we have BPF_F_RDONLY and BPF_F_WRONLY, but this only
applies to system call side, meaning the BPF program has full
read/write access to the map as usual while bpf(2) calls with
map fd can either only read or write into the map depending
on the flags. BPF_F_RDONLY_PROG and BPF_F_WRONLY_PROG allows
for the exact opposite such that verifier is going to reject
program loads if write into a read-only map or a read into a
write-only map is detected. For read-only map case also some
helpers are forbidden for programs that would alter the map
state such as map deletion, update, etc. As opposed to the two
BPF_F_RDONLY / BPF_F_WRONLY flags, BPF_F_RDONLY_PROG as well
as BPF_F_WRONLY_PROG really do correspond to the map lifetime.
We've enabled this generic map extension to various non-special
maps holding normal user data: array, hash, lru, lpm, local
storage, queue and stack. Further generic map types could be
followed up in future depending on use-case. Main use case
here is to forbid writes into .rodata map values from verifier
side.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-04-09 23:20:05 +02:00
|
|
|
if (attr->map_flags & ~LOCAL_STORAGE_CREATE_FLAG_MASK ||
|
|
|
|
!bpf_map_flags_access_ok(attr->map_flags))
|
2018-08-02 23:27:18 +02:00
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
|
|
|
|
if (attr->max_entries)
|
|
|
|
/* max_entries is not used and enforced to be 0 */
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
|
2019-05-30 03:03:59 +02:00
|
|
|
ret = bpf_map_charge_init(&mem, sizeof(struct bpf_cgroup_storage_map));
|
2019-05-30 03:03:55 +02:00
|
|
|
if (ret < 0)
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
|
2018-08-02 23:27:18 +02:00
|
|
|
map = kmalloc_node(sizeof(struct bpf_cgroup_storage_map),
|
|
|
|
__GFP_ZERO | GFP_USER, numa_node);
|
2019-05-30 03:03:58 +02:00
|
|
|
if (!map) {
|
|
|
|
bpf_map_charge_finish(&mem);
|
2018-08-02 23:27:18 +02:00
|
|
|
return ERR_PTR(-ENOMEM);
|
2019-05-30 03:03:58 +02:00
|
|
|
}
|
2018-08-02 23:27:18 +02:00
|
|
|
|
2019-05-30 03:03:58 +02:00
|
|
|
bpf_map_charge_move(&map->map.memory, &mem);
|
2018-08-02 23:27:18 +02:00
|
|
|
|
|
|
|
/* copy mandatory map attributes */
|
|
|
|
bpf_map_init_from_attr(&map->map, attr);
|
|
|
|
|
|
|
|
spin_lock_init(&map->lock);
|
|
|
|
map->root = RB_ROOT;
|
|
|
|
INIT_LIST_HEAD(&map->list);
|
|
|
|
|
|
|
|
return &map->map;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void cgroup_storage_map_free(struct bpf_map *_map)
|
|
|
|
{
|
|
|
|
struct bpf_cgroup_storage_map *map = map_to_storage(_map);
|
|
|
|
|
|
|
|
WARN_ON(!RB_EMPTY_ROOT(&map->root));
|
|
|
|
WARN_ON(!list_empty(&map->list));
|
|
|
|
|
|
|
|
kfree(map);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cgroup_storage_delete_elem(struct bpf_map *map, void *key)
|
|
|
|
{
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
|
|
|
static int cgroup_storage_check_btf(const struct bpf_map *map,
|
|
|
|
const struct btf *btf,
|
|
|
|
const struct btf_type *key_type,
|
|
|
|
const struct btf_type *value_type)
|
|
|
|
{
|
|
|
|
struct btf_member *m;
|
2018-12-16 07:13:52 +01:00
|
|
|
u32 offset, size;
|
bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
|
|
|
|
|
|
|
/* Key is expected to be of struct bpf_cgroup_storage_key type,
|
|
|
|
* which is:
|
|
|
|
* struct bpf_cgroup_storage_key {
|
|
|
|
* __u64 cgroup_inode_id;
|
|
|
|
* __u32 attach_type;
|
|
|
|
* };
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Key_type must be a structure with two fields.
|
|
|
|
*/
|
|
|
|
if (BTF_INFO_KIND(key_type->info) != BTF_KIND_STRUCT ||
|
|
|
|
BTF_INFO_VLEN(key_type->info) != 2)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The first field must be a 64 bit integer at 0 offset.
|
|
|
|
*/
|
|
|
|
m = (struct btf_member *)(key_type + 1);
|
|
|
|
size = FIELD_SIZEOF(struct bpf_cgroup_storage_key, cgroup_inode_id);
|
2018-12-16 07:13:52 +01:00
|
|
|
if (!btf_member_is_reg_int(btf, key_type, m, 0, size))
|
bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The second field must be a 32 bit integer at 64 bit offset.
|
|
|
|
*/
|
|
|
|
m++;
|
2018-12-16 07:13:52 +01:00
|
|
|
offset = offsetof(struct bpf_cgroup_storage_key, attach_type);
|
bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
|
|
|
size = FIELD_SIZEOF(struct bpf_cgroup_storage_key, attach_type);
|
2018-12-16 07:13:52 +01:00
|
|
|
if (!btf_member_is_reg_int(btf, key_type, m, offset, size))
|
bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void cgroup_storage_seq_show_elem(struct bpf_map *map, void *_key,
|
|
|
|
struct seq_file *m)
|
|
|
|
{
|
|
|
|
enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
|
|
|
|
struct bpf_cgroup_storage_key *key = _key;
|
|
|
|
struct bpf_cgroup_storage *storage;
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
storage = cgroup_storage_lookup(map_to_storage(map), key, false);
|
|
|
|
if (!storage) {
|
|
|
|
rcu_read_unlock();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
btf_type_seq_show(map->btf, map->btf_key_type_id, key, m);
|
|
|
|
stype = cgroup_storage_type(map);
|
|
|
|
if (stype == BPF_CGROUP_STORAGE_SHARED) {
|
|
|
|
seq_puts(m, ": ");
|
|
|
|
btf_type_seq_show(map->btf, map->btf_value_type_id,
|
|
|
|
&READ_ONCE(storage->buf)->data[0], m);
|
|
|
|
seq_puts(m, "\n");
|
|
|
|
} else {
|
|
|
|
seq_puts(m, ": {\n");
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
|
|
seq_printf(m, "\tcpu%d: ", cpu);
|
|
|
|
btf_type_seq_show(map->btf, map->btf_value_type_id,
|
|
|
|
per_cpu_ptr(storage->percpu_buf, cpu),
|
|
|
|
m);
|
|
|
|
seq_puts(m, "\n");
|
|
|
|
}
|
|
|
|
seq_puts(m, "}\n");
|
|
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
}
|
|
|
|
|
2018-08-02 23:27:18 +02:00
|
|
|
const struct bpf_map_ops cgroup_storage_map_ops = {
|
|
|
|
.map_alloc = cgroup_storage_map_alloc,
|
|
|
|
.map_free = cgroup_storage_map_free,
|
|
|
|
.map_get_next_key = cgroup_storage_get_next_key,
|
|
|
|
.map_lookup_elem = cgroup_storage_lookup_elem,
|
|
|
|
.map_update_elem = cgroup_storage_update_elem,
|
|
|
|
.map_delete_elem = cgroup_storage_delete_elem,
|
bpf: add bpffs pretty print for cgroup local storage maps
Implement bpffs pretty printing for cgroup local storage maps
(both shared and per-cpu).
Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
Shared:
$ cat /sys/fs/bpf/map_2
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {9999,1039896}
Per-cpu:
$ cat /sys/fs/bpf/map_1
# WARNING!! The output is for debug purpose only
# WARNING!! The output format will change
{4294968594,1}: {
cpu0: {0,0,0,0,0}
cpu1: {0,0,0,0,0}
cpu2: {1,104,0,0,0}
cpu3: {0,0,0,0,0}
}
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-11 00:43:01 +01:00
|
|
|
.map_check_btf = cgroup_storage_check_btf,
|
|
|
|
.map_seq_show_elem = cgroup_storage_seq_show_elem,
|
2018-08-02 23:27:18 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
int bpf_cgroup_storage_assign(struct bpf_prog *prog, struct bpf_map *_map)
|
|
|
|
{
|
2018-09-28 16:45:36 +02:00
|
|
|
enum bpf_cgroup_storage_type stype = cgroup_storage_type(_map);
|
2018-08-02 23:27:18 +02:00
|
|
|
struct bpf_cgroup_storage_map *map = map_to_storage(_map);
|
|
|
|
int ret = -EBUSY;
|
|
|
|
|
|
|
|
spin_lock_bh(&map->lock);
|
|
|
|
|
|
|
|
if (map->prog && map->prog != prog)
|
|
|
|
goto unlock;
|
2018-09-28 16:45:36 +02:00
|
|
|
if (prog->aux->cgroup_storage[stype] &&
|
|
|
|
prog->aux->cgroup_storage[stype] != _map)
|
2018-08-02 23:27:18 +02:00
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
map->prog = prog;
|
2018-09-28 16:45:36 +02:00
|
|
|
prog->aux->cgroup_storage[stype] = _map;
|
2018-08-02 23:27:18 +02:00
|
|
|
ret = 0;
|
|
|
|
unlock:
|
|
|
|
spin_unlock_bh(&map->lock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *_map)
|
|
|
|
{
|
2018-09-28 16:45:36 +02:00
|
|
|
enum bpf_cgroup_storage_type stype = cgroup_storage_type(_map);
|
2018-08-02 23:27:18 +02:00
|
|
|
struct bpf_cgroup_storage_map *map = map_to_storage(_map);
|
|
|
|
|
|
|
|
spin_lock_bh(&map->lock);
|
|
|
|
if (map->prog == prog) {
|
2018-09-28 16:45:36 +02:00
|
|
|
WARN_ON(prog->aux->cgroup_storage[stype] != _map);
|
2018-08-02 23:27:18 +02:00
|
|
|
map->prog = NULL;
|
2018-09-28 16:45:36 +02:00
|
|
|
prog->aux->cgroup_storage[stype] = NULL;
|
2018-08-02 23:27:18 +02:00
|
|
|
}
|
|
|
|
spin_unlock_bh(&map->lock);
|
|
|
|
}
|
|
|
|
|
2018-09-28 16:45:43 +02:00
|
|
|
static size_t bpf_cgroup_storage_calculate_size(struct bpf_map *map, u32 *pages)
|
|
|
|
{
|
|
|
|
size_t size;
|
|
|
|
|
|
|
|
if (cgroup_storage_type(map) == BPF_CGROUP_STORAGE_SHARED) {
|
|
|
|
size = sizeof(struct bpf_storage_buffer) + map->value_size;
|
|
|
|
*pages = round_up(sizeof(struct bpf_cgroup_storage) + size,
|
|
|
|
PAGE_SIZE) >> PAGE_SHIFT;
|
|
|
|
} else {
|
|
|
|
size = map->value_size;
|
|
|
|
*pages = round_up(round_up(size, 8) * num_possible_cpus(),
|
|
|
|
PAGE_SIZE) >> PAGE_SHIFT;
|
|
|
|
}
|
|
|
|
|
|
|
|
return size;
|
|
|
|
}
|
|
|
|
|
2018-09-28 16:45:36 +02:00
|
|
|
struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
|
|
|
|
enum bpf_cgroup_storage_type stype)
|
2018-08-02 23:27:18 +02:00
|
|
|
{
|
|
|
|
struct bpf_cgroup_storage *storage;
|
|
|
|
struct bpf_map *map;
|
2018-09-28 16:45:43 +02:00
|
|
|
gfp_t flags;
|
|
|
|
size_t size;
|
2018-08-02 23:27:18 +02:00
|
|
|
u32 pages;
|
|
|
|
|
2018-09-28 16:45:36 +02:00
|
|
|
map = prog->aux->cgroup_storage[stype];
|
2018-08-02 23:27:18 +02:00
|
|
|
if (!map)
|
|
|
|
return NULL;
|
|
|
|
|
2018-09-28 16:45:43 +02:00
|
|
|
size = bpf_cgroup_storage_calculate_size(map, &pages);
|
|
|
|
|
2018-08-02 23:27:18 +02:00
|
|
|
if (bpf_map_charge_memlock(map, pages))
|
|
|
|
return ERR_PTR(-EPERM);
|
|
|
|
|
|
|
|
storage = kmalloc_node(sizeof(struct bpf_cgroup_storage),
|
|
|
|
__GFP_ZERO | GFP_USER, map->numa_node);
|
2018-09-28 16:45:43 +02:00
|
|
|
if (!storage)
|
|
|
|
goto enomem;
|
2018-08-02 23:27:18 +02:00
|
|
|
|
2018-09-28 16:45:43 +02:00
|
|
|
flags = __GFP_ZERO | GFP_USER;
|
|
|
|
|
|
|
|
if (stype == BPF_CGROUP_STORAGE_SHARED) {
|
|
|
|
storage->buf = kmalloc_node(size, flags, map->numa_node);
|
|
|
|
if (!storage->buf)
|
|
|
|
goto enomem;
|
2019-02-01 00:40:05 +01:00
|
|
|
check_and_init_map_lock(map, storage->buf->data);
|
2018-09-28 16:45:43 +02:00
|
|
|
} else {
|
|
|
|
storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags);
|
|
|
|
if (!storage->percpu_buf)
|
|
|
|
goto enomem;
|
2018-08-02 23:27:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
storage->map = (struct bpf_cgroup_storage_map *)map;
|
|
|
|
|
|
|
|
return storage;
|
2018-09-28 16:45:43 +02:00
|
|
|
|
|
|
|
enomem:
|
|
|
|
bpf_map_uncharge_memlock(map, pages);
|
|
|
|
kfree(storage);
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void free_shared_cgroup_storage_rcu(struct rcu_head *rcu)
|
|
|
|
{
|
|
|
|
struct bpf_cgroup_storage *storage =
|
|
|
|
container_of(rcu, struct bpf_cgroup_storage, rcu);
|
|
|
|
|
|
|
|
kfree(storage->buf);
|
|
|
|
kfree(storage);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void free_percpu_cgroup_storage_rcu(struct rcu_head *rcu)
|
|
|
|
{
|
|
|
|
struct bpf_cgroup_storage *storage =
|
|
|
|
container_of(rcu, struct bpf_cgroup_storage, rcu);
|
|
|
|
|
|
|
|
free_percpu(storage->percpu_buf);
|
|
|
|
kfree(storage);
|
2018-08-02 23:27:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage)
|
|
|
|
{
|
2018-09-28 16:45:43 +02:00
|
|
|
enum bpf_cgroup_storage_type stype;
|
2018-08-02 23:27:18 +02:00
|
|
|
struct bpf_map *map;
|
2018-09-28 16:45:43 +02:00
|
|
|
u32 pages;
|
2018-08-02 23:27:18 +02:00
|
|
|
|
|
|
|
if (!storage)
|
|
|
|
return;
|
|
|
|
|
|
|
|
map = &storage->map->map;
|
2018-09-28 16:45:43 +02:00
|
|
|
|
|
|
|
bpf_cgroup_storage_calculate_size(map, &pages);
|
2018-08-02 23:27:18 +02:00
|
|
|
bpf_map_uncharge_memlock(map, pages);
|
|
|
|
|
2018-09-28 16:45:43 +02:00
|
|
|
stype = cgroup_storage_type(map);
|
|
|
|
if (stype == BPF_CGROUP_STORAGE_SHARED)
|
|
|
|
call_rcu(&storage->rcu, free_shared_cgroup_storage_rcu);
|
|
|
|
else
|
|
|
|
call_rcu(&storage->rcu, free_percpu_cgroup_storage_rcu);
|
2018-08-02 23:27:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
|
|
|
|
struct cgroup *cgroup,
|
|
|
|
enum bpf_attach_type type)
|
|
|
|
{
|
|
|
|
struct bpf_cgroup_storage_map *map;
|
|
|
|
|
|
|
|
if (!storage)
|
|
|
|
return;
|
|
|
|
|
|
|
|
storage->key.attach_type = type;
|
|
|
|
storage->key.cgroup_inode_id = cgroup->kn->id.id;
|
|
|
|
|
|
|
|
map = storage->map;
|
|
|
|
|
|
|
|
spin_lock_bh(&map->lock);
|
|
|
|
WARN_ON(cgroup_storage_insert(map, storage));
|
|
|
|
list_add(&storage->list, &map->list);
|
|
|
|
spin_unlock_bh(&map->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage)
|
|
|
|
{
|
|
|
|
struct bpf_cgroup_storage_map *map;
|
|
|
|
struct rb_root *root;
|
|
|
|
|
|
|
|
if (!storage)
|
|
|
|
return;
|
|
|
|
|
|
|
|
map = storage->map;
|
|
|
|
|
|
|
|
spin_lock_bh(&map->lock);
|
|
|
|
root = &map->root;
|
|
|
|
rb_erase(&storage->node, root);
|
|
|
|
|
|
|
|
list_del(&storage->list);
|
|
|
|
spin_unlock_bh(&map->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|