// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*/
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#include <linux/bpf.h>
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#include <linux/bpf_trace.h>
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#include <linux/bpf_lirc.h>
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#include <linux/bpf_verifier.h>
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#include <linux/btf.h>
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#include <linux/syscalls.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/vmalloc.h>
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#include <linux/mmzone.h>
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#include <linux/anon_inodes.h>
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#include <linux/fdtable.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/license.h>
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#include <linux/filter.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/idr.h>
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#include <linux/cred.h>
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#include <linux/timekeeping.h>
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#include <linux/ctype.h>
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#include <linux/nospec.h>
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#include <linux/audit.h>
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#include <uapi/linux/btf.h>
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#include <linux/pgtable.h>
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#include <linux/bpf_lsm.h>
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#include <linux/poll.h>
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#include <linux/bpf-netns.h>
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#include <linux/rcupdate_trace.h>
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#include <trace/hooks/syscall_check.h>
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#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
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(map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
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(map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
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#define IS_FD_PROG_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY)
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#define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
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#define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map) || \
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IS_FD_HASH(map))
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#define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
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DEFINE_PER_CPU(int, bpf_prog_active);
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static DEFINE_IDR(prog_idr);
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static DEFINE_SPINLOCK(prog_idr_lock);
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static DEFINE_IDR(map_idr);
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static DEFINE_SPINLOCK(map_idr_lock);
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static DEFINE_IDR(link_idr);
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static DEFINE_SPINLOCK(link_idr_lock);
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int sysctl_unprivileged_bpf_disabled __read_mostly =
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IS_BUILTIN(CONFIG_BPF_UNPRIV_DEFAULT_OFF) ? 2 : 0;
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static const struct bpf_map_ops * const bpf_map_types[] = {
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#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
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#define BPF_MAP_TYPE(_id, _ops) \
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[_id] = &_ops,
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#define BPF_LINK_TYPE(_id, _name)
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#include <linux/bpf_types.h>
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#undef BPF_PROG_TYPE
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#undef BPF_MAP_TYPE
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#undef BPF_LINK_TYPE
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};
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/*
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* If we're handed a bigger struct than we know of, ensure all the unknown bits
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* are 0 - i.e. new user-space does not rely on any kernel feature extensions
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* we don't know about yet.
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*
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* There is a ToCToU between this function call and the following
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* copy_from_user() call. However, this is not a concern since this function is
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* meant to be a future-proofing of bits.
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*/
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int bpf_check_uarg_tail_zero(void __user *uaddr,
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size_t expected_size,
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size_t actual_size)
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{
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unsigned char __user *addr = uaddr + expected_size;
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int res;
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if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
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return -E2BIG;
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if (actual_size <= expected_size)
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return 0;
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res = check_zeroed_user(addr, actual_size - expected_size);
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if (res < 0)
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return res;
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return res ? 0 : -E2BIG;
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}
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const struct bpf_map_ops bpf_map_offload_ops = {
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.map_meta_equal = bpf_map_meta_equal,
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.map_alloc = bpf_map_offload_map_alloc,
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.map_free = bpf_map_offload_map_free,
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.map_check_btf = map_check_no_btf,
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};
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static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
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{
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const struct bpf_map_ops *ops;
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u32 type = attr->map_type;
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struct bpf_map *map;
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int err;
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if (type >= ARRAY_SIZE(bpf_map_types))
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return ERR_PTR(-EINVAL);
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type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types));
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ops = bpf_map_types[type];
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if (!ops)
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return ERR_PTR(-EINVAL);
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if (ops->map_alloc_check) {
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err = ops->map_alloc_check(attr);
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if (err)
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return ERR_PTR(err);
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}
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if (attr->map_ifindex)
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ops = &bpf_map_offload_ops;
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map = ops->map_alloc(attr);
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if (IS_ERR(map))
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return map;
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map->ops = ops;
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map->map_type = type;
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return map;
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}
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static void bpf_map_write_active_inc(struct bpf_map *map)
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{
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atomic64_inc(&map->writecnt);
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}
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static void bpf_map_write_active_dec(struct bpf_map *map)
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{
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atomic64_dec(&map->writecnt);
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}
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bool bpf_map_write_active(const struct bpf_map *map)
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{
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return atomic64_read(&map->writecnt) != 0;
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}
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static u32 bpf_map_value_size(struct bpf_map *map)
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{
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if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
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map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
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map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
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map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
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return round_up(map->value_size, 8) * num_possible_cpus();
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else if (IS_FD_MAP(map))
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return sizeof(u32);
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else
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return map->value_size;
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}
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static void maybe_wait_bpf_programs(struct bpf_map *map)
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{
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/* Wait for any running BPF programs to complete so that
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* userspace, when we return to it, knows that all programs
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* that could be running use the new map value.
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*/
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if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
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map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
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synchronize_rcu();
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}
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static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
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void *value, __u64 flags)
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{
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int err;
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/* Need to create a kthread, thus must support schedule */
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if (bpf_map_is_dev_bound(map)) {
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return bpf_map_offload_update_elem(map, key, value, flags);
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} else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
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map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
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return map->ops->map_update_elem(map, key, value, flags);
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} else if (map->map_type == BPF_MAP_TYPE_SOCKHASH ||
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map->map_type == BPF_MAP_TYPE_SOCKMAP) {
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return sock_map_update_elem_sys(map, key, value, flags);
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} else if (IS_FD_PROG_ARRAY(map)) {
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return bpf_fd_array_map_update_elem(map, f.file, key, value,
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flags);
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}
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bpf_disable_instrumentation();
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if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
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map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
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err = bpf_percpu_hash_update(map, key, value, flags);
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} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
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err = bpf_percpu_array_update(map, key, value, flags);
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} else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
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err = bpf_percpu_cgroup_storage_update(map, key, value,
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flags);
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} else if (IS_FD_ARRAY(map)) {
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rcu_read_lock();
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err = bpf_fd_array_map_update_elem(map, f.file, key, value,
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flags);
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rcu_read_unlock();
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} else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
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rcu_read_lock();
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err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
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flags);
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rcu_read_unlock();
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} else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
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/* rcu_read_lock() is not needed */
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err = bpf_fd_reuseport_array_update_elem(map, key, value,
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flags);
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} else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
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map->map_type == BPF_MAP_TYPE_STACK) {
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err = map->ops->map_push_elem(map, value, flags);
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} else {
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rcu_read_lock();
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err = map->ops->map_update_elem(map, key, value, flags);
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rcu_read_unlock();
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}
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bpf_enable_instrumentation();
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maybe_wait_bpf_programs(map);
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return err;
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}
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static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
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__u64 flags)
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{
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void *ptr;
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int err;
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if (bpf_map_is_dev_bound(map))
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return bpf_map_offload_lookup_elem(map, key, value);
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bpf_disable_instrumentation();
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if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
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map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
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err = bpf_percpu_hash_copy(map, key, value);
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} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
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err = bpf_percpu_array_copy(map, key, value);
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} else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
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err = bpf_percpu_cgroup_storage_copy(map, key, value);
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} else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
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err = bpf_stackmap_copy(map, key, value);
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} else if (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map)) {
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err = bpf_fd_array_map_lookup_elem(map, key, value);
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} else if (IS_FD_HASH(map)) {
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err = bpf_fd_htab_map_lookup_elem(map, key, value);
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} else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
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err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
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} else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
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map->map_type == BPF_MAP_TYPE_STACK) {
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err = map->ops->map_peek_elem(map, value);
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} else if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
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/* struct_ops map requires directly updating "value" */
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err = bpf_struct_ops_map_sys_lookup_elem(map, key, value);
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} else {
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rcu_read_lock();
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if (map->ops->map_lookup_elem_sys_only)
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ptr = map->ops->map_lookup_elem_sys_only(map, key);
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else
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ptr = map->ops->map_lookup_elem(map, key);
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if (IS_ERR(ptr)) {
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err = PTR_ERR(ptr);
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} else if (!ptr) {
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err = -ENOENT;
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} else {
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err = 0;
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if (flags & BPF_F_LOCK)
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/* lock 'ptr' and copy everything but lock */
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copy_map_value_locked(map, value, ptr, true);
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else
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copy_map_value(map, value, ptr);
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/* mask lock, since value wasn't zero inited */
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check_and_init_map_lock(map, value);
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}
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rcu_read_unlock();
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}
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bpf_enable_instrumentation();
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maybe_wait_bpf_programs(map);
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return err;
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}
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static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable)
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{
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/* We really just want to fail instead of triggering OOM killer
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* under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
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* which is used for lower order allocation requests.
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*
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* It has been observed that higher order allocation requests done by
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* vmalloc with __GFP_NORETRY being set might fail due to not trying
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* to reclaim memory from the page cache, thus we set
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* __GFP_RETRY_MAYFAIL to avoid such situations.
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*/
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const gfp_t gfp = __GFP_NOWARN | __GFP_ZERO;
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unsigned int flags = 0;
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unsigned long align = 1;
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void *area;
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if (size >= SIZE_MAX)
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return NULL;
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/* kmalloc()'ed memory can't be mmap()'ed */
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if (mmapable) {
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BUG_ON(!PAGE_ALIGNED(size));
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align = SHMLBA;
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flags = VM_USERMAP;
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} else if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
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area = kmalloc_node(size, gfp | GFP_USER | __GFP_NORETRY,
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numa_node);
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if (area != NULL)
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return area;
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}
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return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
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gfp | GFP_KERNEL | __GFP_RETRY_MAYFAIL, PAGE_KERNEL,
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flags, numa_node, __builtin_return_address(0));
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}
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void *bpf_map_area_alloc(u64 size, int numa_node)
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{
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return __bpf_map_area_alloc(size, numa_node, false);
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}
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void *bpf_map_area_mmapable_alloc(u64 size, int numa_node)
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{
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return __bpf_map_area_alloc(size, numa_node, true);
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}
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void bpf_map_area_free(void *area)
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{
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kvfree(area);
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}
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static u32 bpf_map_flags_retain_permanent(u32 flags)
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{
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/* Some map creation flags are not tied to the map object but
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* rather to the map fd instead, so they have no meaning upon
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* map object inspection since multiple file descriptors with
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* different (access) properties can exist here. Thus, given
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* this has zero meaning for the map itself, lets clear these
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* from here.
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*/
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return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
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}
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void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
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{
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map->map_type = attr->map_type;
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map->key_size = attr->key_size;
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map->value_size = attr->value_size;
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map->max_entries = attr->max_entries;
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map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
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map->numa_node = bpf_map_attr_numa_node(attr);
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}
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static int bpf_charge_memlock(struct user_struct *user, u32 pages)
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{
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unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) {
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atomic_long_sub(pages, &user->locked_vm);
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return -EPERM;
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}
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return 0;
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}
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static void bpf_uncharge_memlock(struct user_struct *user, u32 pages)
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{
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if (user)
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atomic_long_sub(pages, &user->locked_vm);
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}
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int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size)
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{
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u32 pages = round_up(size, PAGE_SIZE) >> PAGE_SHIFT;
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struct user_struct *user;
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int ret;
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if (size >= U32_MAX - PAGE_SIZE)
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return -E2BIG;
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user = get_current_user();
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ret = bpf_charge_memlock(user, pages);
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if (ret) {
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free_uid(user);
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return ret;
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}
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mem->pages = pages;
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mem->user = user;
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return 0;
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}
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void bpf_map_charge_finish(struct bpf_map_memory *mem)
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{
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bpf_uncharge_memlock(mem->user, mem->pages);
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free_uid(mem->user);
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}
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void bpf_map_charge_move(struct bpf_map_memory *dst,
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struct bpf_map_memory *src)
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{
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*dst = *src;
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/* Make sure src will not be used for the redundant uncharging. */
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memset(src, 0, sizeof(struct bpf_map_memory));
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}
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int bpf_map_charge_memlock(struct bpf_map *map, u32 pages)
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{
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int ret;
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ret = bpf_charge_memlock(map->memory.user, pages);
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if (ret)
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return ret;
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map->memory.pages += pages;
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return ret;
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}
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void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages)
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{
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bpf_uncharge_memlock(map->memory.user, pages);
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map->memory.pages -= pages;
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}
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static int bpf_map_alloc_id(struct bpf_map *map)
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{
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int id;
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idr_preload(GFP_KERNEL);
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spin_lock_bh(&map_idr_lock);
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id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
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if (id > 0)
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map->id = id;
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spin_unlock_bh(&map_idr_lock);
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idr_preload_end();
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if (WARN_ON_ONCE(!id))
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return -ENOSPC;
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return id > 0 ? 0 : id;
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}
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void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
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{
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unsigned long flags;
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/* Offloaded maps are removed from the IDR store when their device
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* disappears - even if someone holds an fd to them they are unusable,
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* the memory is gone, all ops will fail; they are simply waiting for
|
* refcnt to drop to be freed.
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*/
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if (!map->id)
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return;
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if (do_idr_lock)
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spin_lock_irqsave(&map_idr_lock, flags);
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else
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__acquire(&map_idr_lock);
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idr_remove(&map_idr, map->id);
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map->id = 0;
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if (do_idr_lock)
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spin_unlock_irqrestore(&map_idr_lock, flags);
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else
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__release(&map_idr_lock);
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}
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/* called from workqueue */
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static void bpf_map_free_deferred(struct work_struct *work)
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{
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struct bpf_map *map = container_of(work, struct bpf_map, work);
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struct bpf_map_memory mem;
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bpf_map_charge_move(&mem, &map->memory);
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security_bpf_map_free(map);
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/* implementation dependent freeing */
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map->ops->map_free(map);
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bpf_map_charge_finish(&mem);
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}
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static void bpf_map_put_uref(struct bpf_map *map)
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{
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if (atomic64_dec_and_test(&map->usercnt)) {
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if (map->ops->map_release_uref)
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map->ops->map_release_uref(map);
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}
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}
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/* decrement map refcnt and schedule it for freeing via workqueue
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* (unrelying map implementation ops->map_free() might sleep)
|
*/
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static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
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{
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if (atomic64_dec_and_test(&map->refcnt)) {
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/* bpf_map_free_id() must be called first */
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bpf_map_free_id(map, do_idr_lock);
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btf_put(map->btf);
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INIT_WORK(&map->work, bpf_map_free_deferred);
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schedule_work(&map->work);
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}
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}
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void bpf_map_put(struct bpf_map *map)
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{
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__bpf_map_put(map, true);
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}
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EXPORT_SYMBOL_GPL(bpf_map_put);
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void bpf_map_put_with_uref(struct bpf_map *map)
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{
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bpf_map_put_uref(map);
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bpf_map_put(map);
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}
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static int bpf_map_release(struct inode *inode, struct file *filp)
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{
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struct bpf_map *map = filp->private_data;
|
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if (map->ops->map_release)
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map->ops->map_release(map, filp);
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bpf_map_put_with_uref(map);
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return 0;
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}
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static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
|
{
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fmode_t mode = f.file->f_mode;
|
|
/* Our file permissions may have been overridden by global
|
* map permissions facing syscall side.
|
*/
|
if (READ_ONCE(map->frozen))
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mode &= ~FMODE_CAN_WRITE;
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return mode;
|
}
|
|
#ifdef CONFIG_PROC_FS
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static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
|
{
|
const struct bpf_map *map = filp->private_data;
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const struct bpf_array *array;
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u32 type = 0, jited = 0;
|
|
if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
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array = container_of(map, struct bpf_array, map);
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spin_lock(&array->aux->owner.lock);
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type = array->aux->owner.type;
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jited = array->aux->owner.jited;
|
spin_unlock(&array->aux->owner.lock);
|
}
|
|
seq_printf(m,
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"map_type:\t%u\n"
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"key_size:\t%u\n"
|
"value_size:\t%u\n"
|
"max_entries:\t%u\n"
|
"map_flags:\t%#x\n"
|
"memlock:\t%llu\n"
|
"map_id:\t%u\n"
|
"frozen:\t%u\n",
|
map->map_type,
|
map->key_size,
|
map->value_size,
|
map->max_entries,
|
map->map_flags,
|
map->memory.pages * 1ULL << PAGE_SHIFT,
|
map->id,
|
READ_ONCE(map->frozen));
|
if (type) {
|
seq_printf(m, "owner_prog_type:\t%u\n", type);
|
seq_printf(m, "owner_jited:\t%u\n", jited);
|
}
|
}
|
#endif
|
|
static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
|
loff_t *ppos)
|
{
|
/* We need this handler such that alloc_file() enables
|
* f_mode with FMODE_CAN_READ.
|
*/
|
return -EINVAL;
|
}
|
|
static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
|
size_t siz, loff_t *ppos)
|
{
|
/* We need this handler such that alloc_file() enables
|
* f_mode with FMODE_CAN_WRITE.
|
*/
|
return -EINVAL;
|
}
|
|
/* called for any extra memory-mapped regions (except initial) */
|
static void bpf_map_mmap_open(struct vm_area_struct *vma)
|
{
|
struct bpf_map *map = vma->vm_file->private_data;
|
|
if (vma->vm_flags & VM_MAYWRITE)
|
bpf_map_write_active_inc(map);
|
}
|
|
/* called for all unmapped memory region (including initial) */
|
static void bpf_map_mmap_close(struct vm_area_struct *vma)
|
{
|
struct bpf_map *map = vma->vm_file->private_data;
|
|
if (vma->vm_flags & VM_MAYWRITE)
|
bpf_map_write_active_dec(map);
|
}
|
|
static const struct vm_operations_struct bpf_map_default_vmops = {
|
.open = bpf_map_mmap_open,
|
.close = bpf_map_mmap_close,
|
};
|
|
static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma)
|
{
|
struct bpf_map *map = filp->private_data;
|
int err;
|
|
if (!map->ops->map_mmap || map_value_has_spin_lock(map))
|
return -ENOTSUPP;
|
|
if (!(vma->vm_flags & VM_SHARED))
|
return -EINVAL;
|
|
mutex_lock(&map->freeze_mutex);
|
|
if (vma->vm_flags & VM_WRITE) {
|
if (map->frozen) {
|
err = -EPERM;
|
goto out;
|
}
|
/* map is meant to be read-only, so do not allow mapping as
|
* writable, because it's possible to leak a writable page
|
* reference and allows user-space to still modify it after
|
* freezing, while verifier will assume contents do not change
|
*/
|
if (map->map_flags & BPF_F_RDONLY_PROG) {
|
err = -EACCES;
|
goto out;
|
}
|
}
|
|
/* set default open/close callbacks */
|
vma->vm_ops = &bpf_map_default_vmops;
|
vma->vm_private_data = map;
|
vma->vm_flags &= ~VM_MAYEXEC;
|
if (!(vma->vm_flags & VM_WRITE))
|
/* disallow re-mapping with PROT_WRITE */
|
vma->vm_flags &= ~VM_MAYWRITE;
|
|
err = map->ops->map_mmap(map, vma);
|
if (err)
|
goto out;
|
|
if (vma->vm_flags & VM_MAYWRITE)
|
bpf_map_write_active_inc(map);
|
out:
|
mutex_unlock(&map->freeze_mutex);
|
return err;
|
}
|
|
static __poll_t bpf_map_poll(struct file *filp, struct poll_table_struct *pts)
|
{
|
struct bpf_map *map = filp->private_data;
|
|
if (map->ops->map_poll)
|
return map->ops->map_poll(map, filp, pts);
|
|
return EPOLLERR;
|
}
|
|
const struct file_operations bpf_map_fops = {
|
#ifdef CONFIG_PROC_FS
|
.show_fdinfo = bpf_map_show_fdinfo,
|
#endif
|
.release = bpf_map_release,
|
.read = bpf_dummy_read,
|
.write = bpf_dummy_write,
|
.mmap = bpf_map_mmap,
|
.poll = bpf_map_poll,
|
};
|
|
int bpf_map_new_fd(struct bpf_map *map, int flags)
|
{
|
int ret;
|
|
ret = security_bpf_map(map, OPEN_FMODE(flags));
|
if (ret < 0)
|
return ret;
|
|
return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
|
flags | O_CLOEXEC);
|
}
|
|
int bpf_get_file_flag(int flags)
|
{
|
if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
|
return -EINVAL;
|
if (flags & BPF_F_RDONLY)
|
return O_RDONLY;
|
if (flags & BPF_F_WRONLY)
|
return O_WRONLY;
|
return O_RDWR;
|
}
|
|
/* helper macro to check that unused fields 'union bpf_attr' are zero */
|
#define CHECK_ATTR(CMD) \
|
memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
|
sizeof(attr->CMD##_LAST_FIELD), 0, \
|
sizeof(*attr) - \
|
offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
|
sizeof(attr->CMD##_LAST_FIELD)) != NULL
|
|
/* dst and src must have at least "size" number of bytes.
|
* Return strlen on success and < 0 on error.
|
*/
|
int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)
|
{
|
const char *end = src + size;
|
const char *orig_src = src;
|
|
memset(dst, 0, size);
|
/* Copy all isalnum(), '_' and '.' chars. */
|
while (src < end && *src) {
|
if (!isalnum(*src) &&
|
*src != '_' && *src != '.')
|
return -EINVAL;
|
*dst++ = *src++;
|
}
|
|
/* No '\0' found in "size" number of bytes */
|
if (src == end)
|
return -EINVAL;
|
|
return src - orig_src;
|
}
|
|
int map_check_no_btf(const struct bpf_map *map,
|
const struct btf *btf,
|
const struct btf_type *key_type,
|
const struct btf_type *value_type)
|
{
|
return -ENOTSUPP;
|
}
|
|
static int map_check_btf(struct bpf_map *map, const struct btf *btf,
|
u32 btf_key_id, u32 btf_value_id)
|
{
|
const struct btf_type *key_type, *value_type;
|
u32 key_size, value_size;
|
int ret = 0;
|
|
/* Some maps allow key to be unspecified. */
|
if (btf_key_id) {
|
key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
|
if (!key_type || key_size != map->key_size)
|
return -EINVAL;
|
} else {
|
key_type = btf_type_by_id(btf, 0);
|
if (!map->ops->map_check_btf)
|
return -EINVAL;
|
}
|
|
value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
|
if (!value_type || value_size != map->value_size)
|
return -EINVAL;
|
|
map->spin_lock_off = btf_find_spin_lock(btf, value_type);
|
|
if (map_value_has_spin_lock(map)) {
|
if (map->map_flags & BPF_F_RDONLY_PROG)
|
return -EACCES;
|
if (map->map_type != BPF_MAP_TYPE_HASH &&
|
map->map_type != BPF_MAP_TYPE_ARRAY &&
|
map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
|
map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
|
map->map_type != BPF_MAP_TYPE_INODE_STORAGE)
|
return -ENOTSUPP;
|
if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
|
map->value_size) {
|
WARN_ONCE(1,
|
"verifier bug spin_lock_off %d value_size %d\n",
|
map->spin_lock_off, map->value_size);
|
return -EFAULT;
|
}
|
}
|
|
if (map->ops->map_check_btf)
|
ret = map->ops->map_check_btf(map, btf, key_type, value_type);
|
|
return ret;
|
}
|
|
#define BPF_MAP_CREATE_LAST_FIELD btf_vmlinux_value_type_id
|
/* called via syscall */
|
static int map_create(union bpf_attr *attr)
|
{
|
int numa_node = bpf_map_attr_numa_node(attr);
|
struct bpf_map_memory mem;
|
struct bpf_map *map;
|
int f_flags;
|
int err;
|
|
err = CHECK_ATTR(BPF_MAP_CREATE);
|
if (err)
|
return -EINVAL;
|
|
if (attr->btf_vmlinux_value_type_id) {
|
if (attr->map_type != BPF_MAP_TYPE_STRUCT_OPS ||
|
attr->btf_key_type_id || attr->btf_value_type_id)
|
return -EINVAL;
|
} else if (attr->btf_key_type_id && !attr->btf_value_type_id) {
|
return -EINVAL;
|
}
|
|
f_flags = bpf_get_file_flag(attr->map_flags);
|
if (f_flags < 0)
|
return f_flags;
|
|
if (numa_node != NUMA_NO_NODE &&
|
((unsigned int)numa_node >= nr_node_ids ||
|
!node_online(numa_node)))
|
return -EINVAL;
|
|
/* find map type and init map: hashtable vs rbtree vs bloom vs ... */
|
map = find_and_alloc_map(attr);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
|
err = bpf_obj_name_cpy(map->name, attr->map_name,
|
sizeof(attr->map_name));
|
if (err < 0)
|
goto free_map;
|
|
atomic64_set(&map->refcnt, 1);
|
atomic64_set(&map->usercnt, 1);
|
mutex_init(&map->freeze_mutex);
|
|
map->spin_lock_off = -EINVAL;
|
if (attr->btf_key_type_id || attr->btf_value_type_id ||
|
/* Even the map's value is a kernel's struct,
|
* the bpf_prog.o must have BTF to begin with
|
* to figure out the corresponding kernel's
|
* counter part. Thus, attr->btf_fd has
|
* to be valid also.
|
*/
|
attr->btf_vmlinux_value_type_id) {
|
struct btf *btf;
|
|
btf = btf_get_by_fd(attr->btf_fd);
|
if (IS_ERR(btf)) {
|
err = PTR_ERR(btf);
|
goto free_map;
|
}
|
map->btf = btf;
|
|
if (attr->btf_value_type_id) {
|
err = map_check_btf(map, btf, attr->btf_key_type_id,
|
attr->btf_value_type_id);
|
if (err)
|
goto free_map;
|
}
|
|
map->btf_key_type_id = attr->btf_key_type_id;
|
map->btf_value_type_id = attr->btf_value_type_id;
|
map->btf_vmlinux_value_type_id =
|
attr->btf_vmlinux_value_type_id;
|
}
|
|
err = security_bpf_map_alloc(map);
|
if (err)
|
goto free_map;
|
|
err = bpf_map_alloc_id(map);
|
if (err)
|
goto free_map_sec;
|
|
err = bpf_map_new_fd(map, f_flags);
|
if (err < 0) {
|
/* failed to allocate fd.
|
* bpf_map_put_with_uref() is needed because the above
|
* bpf_map_alloc_id() has published the map
|
* to the userspace and the userspace may
|
* have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
|
*/
|
bpf_map_put_with_uref(map);
|
return err;
|
}
|
|
return err;
|
|
free_map_sec:
|
security_bpf_map_free(map);
|
free_map:
|
btf_put(map->btf);
|
bpf_map_charge_move(&mem, &map->memory);
|
map->ops->map_free(map);
|
bpf_map_charge_finish(&mem);
|
return err;
|
}
|
|
/* if error is returned, fd is released.
|
* On success caller should complete fd access with matching fdput()
|
*/
|
struct bpf_map *__bpf_map_get(struct fd f)
|
{
|
if (!f.file)
|
return ERR_PTR(-EBADF);
|
if (f.file->f_op != &bpf_map_fops) {
|
fdput(f);
|
return ERR_PTR(-EINVAL);
|
}
|
|
return f.file->private_data;
|
}
|
|
void bpf_map_inc(struct bpf_map *map)
|
{
|
atomic64_inc(&map->refcnt);
|
}
|
EXPORT_SYMBOL_GPL(bpf_map_inc);
|
|
void bpf_map_inc_with_uref(struct bpf_map *map)
|
{
|
atomic64_inc(&map->refcnt);
|
atomic64_inc(&map->usercnt);
|
}
|
EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref);
|
|
struct bpf_map *bpf_map_get(u32 ufd)
|
{
|
struct fd f = fdget(ufd);
|
struct bpf_map *map;
|
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return map;
|
|
bpf_map_inc(map);
|
fdput(f);
|
|
return map;
|
}
|
|
struct bpf_map *bpf_map_get_with_uref(u32 ufd)
|
{
|
struct fd f = fdget(ufd);
|
struct bpf_map *map;
|
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return map;
|
|
bpf_map_inc_with_uref(map);
|
fdput(f);
|
|
return map;
|
}
|
|
/* map_idr_lock should have been held */
|
static struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
|
{
|
int refold;
|
|
refold = atomic64_fetch_add_unless(&map->refcnt, 1, 0);
|
if (!refold)
|
return ERR_PTR(-ENOENT);
|
if (uref)
|
atomic64_inc(&map->usercnt);
|
|
return map;
|
}
|
|
struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map)
|
{
|
spin_lock_bh(&map_idr_lock);
|
map = __bpf_map_inc_not_zero(map, false);
|
spin_unlock_bh(&map_idr_lock);
|
|
return map;
|
}
|
EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
|
|
int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
|
{
|
return -ENOTSUPP;
|
}
|
|
static void *__bpf_copy_key(void __user *ukey, u64 key_size)
|
{
|
if (key_size)
|
return memdup_user(ukey, key_size);
|
|
if (ukey)
|
return ERR_PTR(-EINVAL);
|
|
return NULL;
|
}
|
|
/* last field in 'union bpf_attr' used by this command */
|
#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
|
|
static int map_lookup_elem(union bpf_attr *attr)
|
{
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
void __user *uvalue = u64_to_user_ptr(attr->value);
|
int ufd = attr->map_fd;
|
struct bpf_map *map;
|
void *key, *value;
|
u32 value_size;
|
struct fd f;
|
int err;
|
|
if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
|
return -EINVAL;
|
|
if (attr->flags & ~BPF_F_LOCK)
|
return -EINVAL;
|
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
if ((attr->flags & BPF_F_LOCK) &&
|
!map_value_has_spin_lock(map)) {
|
err = -EINVAL;
|
goto err_put;
|
}
|
|
key = __bpf_copy_key(ukey, map->key_size);
|
if (IS_ERR(key)) {
|
err = PTR_ERR(key);
|
goto err_put;
|
}
|
|
value_size = bpf_map_value_size(map);
|
|
err = -ENOMEM;
|
value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
|
if (!value)
|
goto free_key;
|
|
err = bpf_map_copy_value(map, key, value, attr->flags);
|
if (err)
|
goto free_value;
|
|
err = -EFAULT;
|
if (copy_to_user(uvalue, value, value_size) != 0)
|
goto free_value;
|
|
err = 0;
|
|
free_value:
|
kfree(value);
|
free_key:
|
kfree(key);
|
err_put:
|
fdput(f);
|
return err;
|
}
|
|
|
#define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
|
|
static int map_update_elem(union bpf_attr *attr)
|
{
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
void __user *uvalue = u64_to_user_ptr(attr->value);
|
int ufd = attr->map_fd;
|
struct bpf_map *map;
|
void *key, *value;
|
u32 value_size;
|
struct fd f;
|
int err;
|
|
if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
|
return -EINVAL;
|
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
bpf_map_write_active_inc(map);
|
if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
if ((attr->flags & BPF_F_LOCK) &&
|
!map_value_has_spin_lock(map)) {
|
err = -EINVAL;
|
goto err_put;
|
}
|
|
key = __bpf_copy_key(ukey, map->key_size);
|
if (IS_ERR(key)) {
|
err = PTR_ERR(key);
|
goto err_put;
|
}
|
|
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 ||
|
map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
|
value_size = round_up(map->value_size, 8) * num_possible_cpus();
|
else
|
value_size = map->value_size;
|
|
err = -ENOMEM;
|
value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
|
if (!value)
|
goto free_key;
|
|
err = -EFAULT;
|
if (copy_from_user(value, uvalue, value_size) != 0)
|
goto free_value;
|
|
err = bpf_map_update_value(map, f, key, value, attr->flags);
|
|
free_value:
|
kfree(value);
|
free_key:
|
kfree(key);
|
err_put:
|
bpf_map_write_active_dec(map);
|
fdput(f);
|
return err;
|
}
|
|
#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
|
|
static int map_delete_elem(union bpf_attr *attr)
|
{
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
int ufd = attr->map_fd;
|
struct bpf_map *map;
|
struct fd f;
|
void *key;
|
int err;
|
|
if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
|
return -EINVAL;
|
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
bpf_map_write_active_inc(map);
|
if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
key = __bpf_copy_key(ukey, map->key_size);
|
if (IS_ERR(key)) {
|
err = PTR_ERR(key);
|
goto err_put;
|
}
|
|
if (bpf_map_is_dev_bound(map)) {
|
err = bpf_map_offload_delete_elem(map, key);
|
goto out;
|
} else if (IS_FD_PROG_ARRAY(map) ||
|
map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
|
/* These maps require sleepable context */
|
err = map->ops->map_delete_elem(map, key);
|
goto out;
|
}
|
|
bpf_disable_instrumentation();
|
rcu_read_lock();
|
err = map->ops->map_delete_elem(map, key);
|
rcu_read_unlock();
|
bpf_enable_instrumentation();
|
maybe_wait_bpf_programs(map);
|
out:
|
kfree(key);
|
err_put:
|
bpf_map_write_active_dec(map);
|
fdput(f);
|
return err;
|
}
|
|
/* last field in 'union bpf_attr' used by this command */
|
#define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
|
|
static int map_get_next_key(union bpf_attr *attr)
|
{
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
void __user *unext_key = u64_to_user_ptr(attr->next_key);
|
int ufd = attr->map_fd;
|
struct bpf_map *map;
|
void *key, *next_key;
|
struct fd f;
|
int err;
|
|
if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
|
return -EINVAL;
|
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
if (ukey) {
|
key = __bpf_copy_key(ukey, map->key_size);
|
if (IS_ERR(key)) {
|
err = PTR_ERR(key);
|
goto err_put;
|
}
|
} else {
|
key = NULL;
|
}
|
|
err = -ENOMEM;
|
next_key = kmalloc(map->key_size, GFP_USER);
|
if (!next_key)
|
goto free_key;
|
|
if (bpf_map_is_dev_bound(map)) {
|
err = bpf_map_offload_get_next_key(map, key, next_key);
|
goto out;
|
}
|
|
rcu_read_lock();
|
err = map->ops->map_get_next_key(map, key, next_key);
|
rcu_read_unlock();
|
out:
|
if (err)
|
goto free_next_key;
|
|
err = -EFAULT;
|
if (copy_to_user(unext_key, next_key, map->key_size) != 0)
|
goto free_next_key;
|
|
err = 0;
|
|
free_next_key:
|
kfree(next_key);
|
free_key:
|
kfree(key);
|
err_put:
|
fdput(f);
|
return err;
|
}
|
|
int generic_map_delete_batch(struct bpf_map *map,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
void __user *keys = u64_to_user_ptr(attr->batch.keys);
|
u32 cp, max_count;
|
int err = 0;
|
void *key;
|
|
if (attr->batch.elem_flags & ~BPF_F_LOCK)
|
return -EINVAL;
|
|
if ((attr->batch.elem_flags & BPF_F_LOCK) &&
|
!map_value_has_spin_lock(map)) {
|
return -EINVAL;
|
}
|
|
max_count = attr->batch.count;
|
if (!max_count)
|
return 0;
|
|
key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
|
if (!key)
|
return -ENOMEM;
|
|
for (cp = 0; cp < max_count; cp++) {
|
err = -EFAULT;
|
if (copy_from_user(key, keys + cp * map->key_size,
|
map->key_size))
|
break;
|
|
if (bpf_map_is_dev_bound(map)) {
|
err = bpf_map_offload_delete_elem(map, key);
|
break;
|
}
|
|
bpf_disable_instrumentation();
|
rcu_read_lock();
|
err = map->ops->map_delete_elem(map, key);
|
rcu_read_unlock();
|
bpf_enable_instrumentation();
|
maybe_wait_bpf_programs(map);
|
if (err)
|
break;
|
cond_resched();
|
}
|
if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
|
err = -EFAULT;
|
|
kfree(key);
|
return err;
|
}
|
|
int generic_map_update_batch(struct bpf_map *map,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
void __user *values = u64_to_user_ptr(attr->batch.values);
|
void __user *keys = u64_to_user_ptr(attr->batch.keys);
|
u32 value_size, cp, max_count;
|
int ufd = attr->batch.map_fd;
|
void *key, *value;
|
struct fd f;
|
int err = 0;
|
|
if (attr->batch.elem_flags & ~BPF_F_LOCK)
|
return -EINVAL;
|
|
if ((attr->batch.elem_flags & BPF_F_LOCK) &&
|
!map_value_has_spin_lock(map)) {
|
return -EINVAL;
|
}
|
|
value_size = bpf_map_value_size(map);
|
|
max_count = attr->batch.count;
|
if (!max_count)
|
return 0;
|
|
key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
|
if (!key)
|
return -ENOMEM;
|
|
value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
|
if (!value) {
|
kfree(key);
|
return -ENOMEM;
|
}
|
|
f = fdget(ufd); /* bpf_map_do_batch() guarantees ufd is valid */
|
for (cp = 0; cp < max_count; cp++) {
|
err = -EFAULT;
|
if (copy_from_user(key, keys + cp * map->key_size,
|
map->key_size) ||
|
copy_from_user(value, values + cp * value_size, value_size))
|
break;
|
|
err = bpf_map_update_value(map, f, key, value,
|
attr->batch.elem_flags);
|
|
if (err)
|
break;
|
cond_resched();
|
}
|
|
if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
|
err = -EFAULT;
|
|
kfree(value);
|
kfree(key);
|
fdput(f);
|
return err;
|
}
|
|
#define MAP_LOOKUP_RETRIES 3
|
|
int generic_map_lookup_batch(struct bpf_map *map,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
void __user *uobatch = u64_to_user_ptr(attr->batch.out_batch);
|
void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch);
|
void __user *values = u64_to_user_ptr(attr->batch.values);
|
void __user *keys = u64_to_user_ptr(attr->batch.keys);
|
void *buf, *buf_prevkey, *prev_key, *key, *value;
|
int err, retry = MAP_LOOKUP_RETRIES;
|
u32 value_size, cp, max_count;
|
|
if (attr->batch.elem_flags & ~BPF_F_LOCK)
|
return -EINVAL;
|
|
if ((attr->batch.elem_flags & BPF_F_LOCK) &&
|
!map_value_has_spin_lock(map))
|
return -EINVAL;
|
|
value_size = bpf_map_value_size(map);
|
|
max_count = attr->batch.count;
|
if (!max_count)
|
return 0;
|
|
if (put_user(0, &uattr->batch.count))
|
return -EFAULT;
|
|
buf_prevkey = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
|
if (!buf_prevkey)
|
return -ENOMEM;
|
|
buf = kmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN);
|
if (!buf) {
|
kfree(buf_prevkey);
|
return -ENOMEM;
|
}
|
|
err = -EFAULT;
|
prev_key = NULL;
|
if (ubatch && copy_from_user(buf_prevkey, ubatch, map->key_size))
|
goto free_buf;
|
key = buf;
|
value = key + map->key_size;
|
if (ubatch)
|
prev_key = buf_prevkey;
|
|
for (cp = 0; cp < max_count;) {
|
rcu_read_lock();
|
err = map->ops->map_get_next_key(map, prev_key, key);
|
rcu_read_unlock();
|
if (err)
|
break;
|
err = bpf_map_copy_value(map, key, value,
|
attr->batch.elem_flags);
|
|
if (err == -ENOENT) {
|
if (retry) {
|
retry--;
|
continue;
|
}
|
err = -EINTR;
|
break;
|
}
|
|
if (err)
|
goto free_buf;
|
|
if (copy_to_user(keys + cp * map->key_size, key,
|
map->key_size)) {
|
err = -EFAULT;
|
goto free_buf;
|
}
|
if (copy_to_user(values + cp * value_size, value, value_size)) {
|
err = -EFAULT;
|
goto free_buf;
|
}
|
|
if (!prev_key)
|
prev_key = buf_prevkey;
|
|
swap(prev_key, key);
|
retry = MAP_LOOKUP_RETRIES;
|
cp++;
|
cond_resched();
|
}
|
|
if (err == -EFAULT)
|
goto free_buf;
|
|
if ((copy_to_user(&uattr->batch.count, &cp, sizeof(cp)) ||
|
(cp && copy_to_user(uobatch, prev_key, map->key_size))))
|
err = -EFAULT;
|
|
free_buf:
|
kfree(buf_prevkey);
|
kfree(buf);
|
return err;
|
}
|
|
#define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value
|
|
static int map_lookup_and_delete_elem(union bpf_attr *attr)
|
{
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
void __user *uvalue = u64_to_user_ptr(attr->value);
|
int ufd = attr->map_fd;
|
struct bpf_map *map;
|
void *key, *value;
|
u32 value_size;
|
struct fd f;
|
int err;
|
|
if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
|
return -EINVAL;
|
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
bpf_map_write_active_inc(map);
|
if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ) ||
|
!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
key = __bpf_copy_key(ukey, map->key_size);
|
if (IS_ERR(key)) {
|
err = PTR_ERR(key);
|
goto err_put;
|
}
|
|
value_size = map->value_size;
|
|
err = -ENOMEM;
|
value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
|
if (!value)
|
goto free_key;
|
|
if (map->map_type == BPF_MAP_TYPE_QUEUE ||
|
map->map_type == BPF_MAP_TYPE_STACK) {
|
err = map->ops->map_pop_elem(map, value);
|
} else {
|
err = -ENOTSUPP;
|
}
|
|
if (err)
|
goto free_value;
|
|
if (copy_to_user(uvalue, value, value_size) != 0) {
|
err = -EFAULT;
|
goto free_value;
|
}
|
|
err = 0;
|
|
free_value:
|
kfree(value);
|
free_key:
|
kfree(key);
|
err_put:
|
bpf_map_write_active_dec(map);
|
fdput(f);
|
return err;
|
}
|
|
#define BPF_MAP_FREEZE_LAST_FIELD map_fd
|
|
static int map_freeze(const union bpf_attr *attr)
|
{
|
int err = 0, ufd = attr->map_fd;
|
struct bpf_map *map;
|
struct fd f;
|
|
if (CHECK_ATTR(BPF_MAP_FREEZE))
|
return -EINVAL;
|
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
|
if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
|
fdput(f);
|
return -ENOTSUPP;
|
}
|
|
mutex_lock(&map->freeze_mutex);
|
if (bpf_map_write_active(map)) {
|
err = -EBUSY;
|
goto err_put;
|
}
|
if (READ_ONCE(map->frozen)) {
|
err = -EBUSY;
|
goto err_put;
|
}
|
if (!bpf_capable()) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
WRITE_ONCE(map->frozen, true);
|
err_put:
|
mutex_unlock(&map->freeze_mutex);
|
fdput(f);
|
return err;
|
}
|
|
static const struct bpf_prog_ops * const bpf_prog_types[] = {
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
|
[_id] = & _name ## _prog_ops,
|
#define BPF_MAP_TYPE(_id, _ops)
|
#define BPF_LINK_TYPE(_id, _name)
|
#include <linux/bpf_types.h>
|
#undef BPF_PROG_TYPE
|
#undef BPF_MAP_TYPE
|
#undef BPF_LINK_TYPE
|
};
|
|
static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
|
{
|
const struct bpf_prog_ops *ops;
|
|
if (type >= ARRAY_SIZE(bpf_prog_types))
|
return -EINVAL;
|
type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
|
ops = bpf_prog_types[type];
|
if (!ops)
|
return -EINVAL;
|
|
if (!bpf_prog_is_dev_bound(prog->aux))
|
prog->aux->ops = ops;
|
else
|
prog->aux->ops = &bpf_offload_prog_ops;
|
prog->type = type;
|
return 0;
|
}
|
|
enum bpf_audit {
|
BPF_AUDIT_LOAD,
|
BPF_AUDIT_UNLOAD,
|
BPF_AUDIT_MAX,
|
};
|
|
static const char * const bpf_audit_str[BPF_AUDIT_MAX] = {
|
[BPF_AUDIT_LOAD] = "LOAD",
|
[BPF_AUDIT_UNLOAD] = "UNLOAD",
|
};
|
|
static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op)
|
{
|
struct audit_context *ctx = NULL;
|
struct audit_buffer *ab;
|
|
if (WARN_ON_ONCE(op >= BPF_AUDIT_MAX))
|
return;
|
if (audit_enabled == AUDIT_OFF)
|
return;
|
if (op == BPF_AUDIT_LOAD)
|
ctx = audit_context();
|
ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_BPF);
|
if (unlikely(!ab))
|
return;
|
audit_log_format(ab, "prog-id=%u op=%s",
|
prog->aux->id, bpf_audit_str[op]);
|
audit_log_end(ab);
|
}
|
|
int __bpf_prog_charge(struct user_struct *user, u32 pages)
|
{
|
unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
|
unsigned long user_bufs;
|
|
if (user) {
|
user_bufs = atomic_long_add_return(pages, &user->locked_vm);
|
if (user_bufs > memlock_limit) {
|
atomic_long_sub(pages, &user->locked_vm);
|
return -EPERM;
|
}
|
}
|
|
return 0;
|
}
|
|
void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
|
{
|
if (user)
|
atomic_long_sub(pages, &user->locked_vm);
|
}
|
|
static int bpf_prog_charge_memlock(struct bpf_prog *prog)
|
{
|
struct user_struct *user = get_current_user();
|
int ret;
|
|
ret = __bpf_prog_charge(user, prog->pages);
|
if (ret) {
|
free_uid(user);
|
return ret;
|
}
|
|
prog->aux->user = user;
|
return 0;
|
}
|
|
static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
|
{
|
struct user_struct *user = prog->aux->user;
|
|
__bpf_prog_uncharge(user, prog->pages);
|
free_uid(user);
|
}
|
|
static int bpf_prog_alloc_id(struct bpf_prog *prog)
|
{
|
int id;
|
|
idr_preload(GFP_KERNEL);
|
spin_lock_bh(&prog_idr_lock);
|
id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
|
if (id > 0)
|
prog->aux->id = id;
|
spin_unlock_bh(&prog_idr_lock);
|
idr_preload_end();
|
|
/* id is in [1, INT_MAX) */
|
if (WARN_ON_ONCE(!id))
|
return -ENOSPC;
|
|
return id > 0 ? 0 : id;
|
}
|
|
void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
|
{
|
/* cBPF to eBPF migrations are currently not in the idr store.
|
* Offloaded programs are removed from the store when their device
|
* disappears - even if someone grabs an fd to them they are unusable,
|
* simply waiting for refcnt to drop to be freed.
|
*/
|
if (!prog->aux->id)
|
return;
|
|
if (do_idr_lock)
|
spin_lock_bh(&prog_idr_lock);
|
else
|
__acquire(&prog_idr_lock);
|
|
idr_remove(&prog_idr, prog->aux->id);
|
prog->aux->id = 0;
|
|
if (do_idr_lock)
|
spin_unlock_bh(&prog_idr_lock);
|
else
|
__release(&prog_idr_lock);
|
}
|
|
static void __bpf_prog_put_rcu(struct rcu_head *rcu)
|
{
|
struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
|
|
kvfree(aux->func_info);
|
kfree(aux->func_info_aux);
|
bpf_prog_uncharge_memlock(aux->prog);
|
security_bpf_prog_free(aux);
|
bpf_prog_free(aux->prog);
|
}
|
|
static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
|
{
|
bpf_prog_kallsyms_del_all(prog);
|
btf_put(prog->aux->btf);
|
bpf_prog_free_linfo(prog);
|
|
if (deferred) {
|
if (prog->aux->sleepable)
|
call_rcu_tasks_trace(&prog->aux->rcu, __bpf_prog_put_rcu);
|
else
|
call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
|
} else {
|
__bpf_prog_put_rcu(&prog->aux->rcu);
|
}
|
}
|
|
static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
|
{
|
if (atomic64_dec_and_test(&prog->aux->refcnt)) {
|
perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
|
bpf_audit_prog(prog, BPF_AUDIT_UNLOAD);
|
/* bpf_prog_free_id() must be called first */
|
bpf_prog_free_id(prog, do_idr_lock);
|
__bpf_prog_put_noref(prog, true);
|
}
|
}
|
|
void bpf_prog_put(struct bpf_prog *prog)
|
{
|
__bpf_prog_put(prog, true);
|
}
|
EXPORT_SYMBOL_GPL(bpf_prog_put);
|
|
static int bpf_prog_release(struct inode *inode, struct file *filp)
|
{
|
struct bpf_prog *prog = filp->private_data;
|
|
bpf_prog_put(prog);
|
return 0;
|
}
|
|
static void bpf_prog_get_stats(const struct bpf_prog *prog,
|
struct bpf_prog_stats *stats)
|
{
|
u64 nsecs = 0, cnt = 0;
|
int cpu;
|
|
for_each_possible_cpu(cpu) {
|
const struct bpf_prog_stats *st;
|
unsigned int start;
|
u64 tnsecs, tcnt;
|
|
st = per_cpu_ptr(prog->aux->stats, cpu);
|
do {
|
start = u64_stats_fetch_begin_irq(&st->syncp);
|
tnsecs = st->nsecs;
|
tcnt = st->cnt;
|
} while (u64_stats_fetch_retry_irq(&st->syncp, start));
|
nsecs += tnsecs;
|
cnt += tcnt;
|
}
|
stats->nsecs = nsecs;
|
stats->cnt = cnt;
|
}
|
|
#ifdef CONFIG_PROC_FS
|
static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
|
{
|
const struct bpf_prog *prog = filp->private_data;
|
char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
|
struct bpf_prog_stats stats;
|
|
bpf_prog_get_stats(prog, &stats);
|
bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
|
seq_printf(m,
|
"prog_type:\t%u\n"
|
"prog_jited:\t%u\n"
|
"prog_tag:\t%s\n"
|
"memlock:\t%llu\n"
|
"prog_id:\t%u\n"
|
"run_time_ns:\t%llu\n"
|
"run_cnt:\t%llu\n",
|
prog->type,
|
prog->jited,
|
prog_tag,
|
prog->pages * 1ULL << PAGE_SHIFT,
|
prog->aux->id,
|
stats.nsecs,
|
stats.cnt);
|
}
|
#endif
|
|
const struct file_operations bpf_prog_fops = {
|
#ifdef CONFIG_PROC_FS
|
.show_fdinfo = bpf_prog_show_fdinfo,
|
#endif
|
.release = bpf_prog_release,
|
.read = bpf_dummy_read,
|
.write = bpf_dummy_write,
|
};
|
|
int bpf_prog_new_fd(struct bpf_prog *prog)
|
{
|
int ret;
|
|
ret = security_bpf_prog(prog);
|
if (ret < 0)
|
return ret;
|
|
return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
|
O_RDWR | O_CLOEXEC);
|
}
|
|
static struct bpf_prog *____bpf_prog_get(struct fd f)
|
{
|
if (!f.file)
|
return ERR_PTR(-EBADF);
|
if (f.file->f_op != &bpf_prog_fops) {
|
fdput(f);
|
return ERR_PTR(-EINVAL);
|
}
|
|
return f.file->private_data;
|
}
|
|
void bpf_prog_add(struct bpf_prog *prog, int i)
|
{
|
atomic64_add(i, &prog->aux->refcnt);
|
}
|
EXPORT_SYMBOL_GPL(bpf_prog_add);
|
|
void bpf_prog_sub(struct bpf_prog *prog, int i)
|
{
|
/* Only to be used for undoing previous bpf_prog_add() in some
|
* error path. We still know that another entity in our call
|
* path holds a reference to the program, thus atomic_sub() can
|
* be safely used in such cases!
|
*/
|
WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0);
|
}
|
EXPORT_SYMBOL_GPL(bpf_prog_sub);
|
|
void bpf_prog_inc(struct bpf_prog *prog)
|
{
|
atomic64_inc(&prog->aux->refcnt);
|
}
|
EXPORT_SYMBOL_GPL(bpf_prog_inc);
|
|
/* prog_idr_lock should have been held */
|
struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
|
{
|
int refold;
|
|
refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0);
|
|
if (!refold)
|
return ERR_PTR(-ENOENT);
|
|
return prog;
|
}
|
EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
|
|
bool bpf_prog_get_ok(struct bpf_prog *prog,
|
enum bpf_prog_type *attach_type, bool attach_drv)
|
{
|
/* not an attachment, just a refcount inc, always allow */
|
if (!attach_type)
|
return true;
|
|
if (prog->type != *attach_type)
|
return false;
|
if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
|
return false;
|
|
return true;
|
}
|
|
static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
|
bool attach_drv)
|
{
|
struct fd f = fdget(ufd);
|
struct bpf_prog *prog;
|
|
prog = ____bpf_prog_get(f);
|
if (IS_ERR(prog))
|
return prog;
|
if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
|
prog = ERR_PTR(-EINVAL);
|
goto out;
|
}
|
|
bpf_prog_inc(prog);
|
out:
|
fdput(f);
|
return prog;
|
}
|
|
struct bpf_prog *bpf_prog_get(u32 ufd)
|
{
|
return __bpf_prog_get(ufd, NULL, false);
|
}
|
|
struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
|
bool attach_drv)
|
{
|
return __bpf_prog_get(ufd, &type, attach_drv);
|
}
|
EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
|
|
/* Initially all BPF programs could be loaded w/o specifying
|
* expected_attach_type. Later for some of them specifying expected_attach_type
|
* at load time became required so that program could be validated properly.
|
* Programs of types that are allowed to be loaded both w/ and w/o (for
|
* backward compatibility) expected_attach_type, should have the default attach
|
* type assigned to expected_attach_type for the latter case, so that it can be
|
* validated later at attach time.
|
*
|
* bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
|
* prog type requires it but has some attach types that have to be backward
|
* compatible.
|
*/
|
static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
|
{
|
switch (attr->prog_type) {
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
/* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
|
* exist so checking for non-zero is the way to go here.
|
*/
|
if (!attr->expected_attach_type)
|
attr->expected_attach_type =
|
BPF_CGROUP_INET_SOCK_CREATE;
|
break;
|
}
|
}
|
|
static int
|
bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
|
enum bpf_attach_type expected_attach_type,
|
u32 btf_id, u32 prog_fd)
|
{
|
if (btf_id) {
|
if (btf_id > BTF_MAX_TYPE)
|
return -EINVAL;
|
|
switch (prog_type) {
|
case BPF_PROG_TYPE_TRACING:
|
case BPF_PROG_TYPE_LSM:
|
case BPF_PROG_TYPE_STRUCT_OPS:
|
case BPF_PROG_TYPE_EXT:
|
break;
|
default:
|
return -EINVAL;
|
}
|
}
|
|
if (prog_fd && prog_type != BPF_PROG_TYPE_TRACING &&
|
prog_type != BPF_PROG_TYPE_EXT)
|
return -EINVAL;
|
|
switch (prog_type) {
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
switch (expected_attach_type) {
|
case BPF_CGROUP_INET_SOCK_CREATE:
|
case BPF_CGROUP_INET_SOCK_RELEASE:
|
case BPF_CGROUP_INET4_POST_BIND:
|
case BPF_CGROUP_INET6_POST_BIND:
|
return 0;
|
default:
|
return -EINVAL;
|
}
|
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
|
switch (expected_attach_type) {
|
case BPF_CGROUP_INET4_BIND:
|
case BPF_CGROUP_INET6_BIND:
|
case BPF_CGROUP_INET4_CONNECT:
|
case BPF_CGROUP_INET6_CONNECT:
|
case BPF_CGROUP_INET4_GETPEERNAME:
|
case BPF_CGROUP_INET6_GETPEERNAME:
|
case BPF_CGROUP_INET4_GETSOCKNAME:
|
case BPF_CGROUP_INET6_GETSOCKNAME:
|
case BPF_CGROUP_UDP4_SENDMSG:
|
case BPF_CGROUP_UDP6_SENDMSG:
|
case BPF_CGROUP_UDP4_RECVMSG:
|
case BPF_CGROUP_UDP6_RECVMSG:
|
return 0;
|
default:
|
return -EINVAL;
|
}
|
case BPF_PROG_TYPE_CGROUP_SKB:
|
switch (expected_attach_type) {
|
case BPF_CGROUP_INET_INGRESS:
|
case BPF_CGROUP_INET_EGRESS:
|
return 0;
|
default:
|
return -EINVAL;
|
}
|
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
|
switch (expected_attach_type) {
|
case BPF_CGROUP_SETSOCKOPT:
|
case BPF_CGROUP_GETSOCKOPT:
|
return 0;
|
default:
|
return -EINVAL;
|
}
|
case BPF_PROG_TYPE_SK_LOOKUP:
|
if (expected_attach_type == BPF_SK_LOOKUP)
|
return 0;
|
return -EINVAL;
|
case BPF_PROG_TYPE_EXT:
|
if (expected_attach_type)
|
return -EINVAL;
|
fallthrough;
|
default:
|
return 0;
|
}
|
}
|
|
static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
|
{
|
switch (prog_type) {
|
case BPF_PROG_TYPE_SCHED_CLS:
|
case BPF_PROG_TYPE_SCHED_ACT:
|
case BPF_PROG_TYPE_XDP:
|
case BPF_PROG_TYPE_LWT_IN:
|
case BPF_PROG_TYPE_LWT_OUT:
|
case BPF_PROG_TYPE_LWT_XMIT:
|
case BPF_PROG_TYPE_LWT_SEG6LOCAL:
|
case BPF_PROG_TYPE_SK_SKB:
|
case BPF_PROG_TYPE_SK_MSG:
|
case BPF_PROG_TYPE_LIRC_MODE2:
|
case BPF_PROG_TYPE_FLOW_DISSECTOR:
|
case BPF_PROG_TYPE_CGROUP_DEVICE:
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
|
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
|
case BPF_PROG_TYPE_CGROUP_SYSCTL:
|
case BPF_PROG_TYPE_SOCK_OPS:
|
case BPF_PROG_TYPE_EXT: /* extends any prog */
|
return true;
|
case BPF_PROG_TYPE_CGROUP_SKB:
|
/* always unpriv */
|
case BPF_PROG_TYPE_SK_REUSEPORT:
|
/* equivalent to SOCKET_FILTER. need CAP_BPF only */
|
default:
|
return false;
|
}
|
}
|
|
static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)
|
{
|
switch (prog_type) {
|
case BPF_PROG_TYPE_KPROBE:
|
case BPF_PROG_TYPE_TRACEPOINT:
|
case BPF_PROG_TYPE_PERF_EVENT:
|
case BPF_PROG_TYPE_RAW_TRACEPOINT:
|
case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
|
case BPF_PROG_TYPE_TRACING:
|
case BPF_PROG_TYPE_LSM:
|
case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */
|
case BPF_PROG_TYPE_EXT: /* extends any prog */
|
return true;
|
default:
|
return false;
|
}
|
}
|
|
/* last field in 'union bpf_attr' used by this command */
|
#define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd
|
|
static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
|
{
|
enum bpf_prog_type type = attr->prog_type;
|
struct bpf_prog *prog;
|
int err;
|
char license[128];
|
bool is_gpl;
|
|
if (CHECK_ATTR(BPF_PROG_LOAD))
|
return -EINVAL;
|
|
if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
|
BPF_F_ANY_ALIGNMENT |
|
BPF_F_TEST_STATE_FREQ |
|
BPF_F_SLEEPABLE |
|
BPF_F_TEST_RND_HI32))
|
return -EINVAL;
|
|
if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
|
(attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
|
!bpf_capable())
|
return -EPERM;
|
|
/* copy eBPF program license from user space */
|
if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
|
sizeof(license) - 1) < 0)
|
return -EFAULT;
|
license[sizeof(license) - 1] = 0;
|
|
/* eBPF programs must be GPL compatible to use GPL-ed functions */
|
is_gpl = license_is_gpl_compatible(license);
|
|
if (attr->insn_cnt == 0 ||
|
attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
|
return -E2BIG;
|
if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
|
type != BPF_PROG_TYPE_CGROUP_SKB &&
|
!bpf_capable())
|
return -EPERM;
|
|
if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
if (is_perfmon_prog_type(type) && !perfmon_capable())
|
return -EPERM;
|
|
bpf_prog_load_fixup_attach_type(attr);
|
if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
|
attr->attach_btf_id,
|
attr->attach_prog_fd))
|
return -EINVAL;
|
|
/* plain bpf_prog allocation */
|
prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
|
if (!prog)
|
return -ENOMEM;
|
|
prog->expected_attach_type = attr->expected_attach_type;
|
prog->aux->attach_btf_id = attr->attach_btf_id;
|
if (attr->attach_prog_fd) {
|
struct bpf_prog *dst_prog;
|
|
dst_prog = bpf_prog_get(attr->attach_prog_fd);
|
if (IS_ERR(dst_prog)) {
|
err = PTR_ERR(dst_prog);
|
goto free_prog_nouncharge;
|
}
|
prog->aux->dst_prog = dst_prog;
|
}
|
|
prog->aux->offload_requested = !!attr->prog_ifindex;
|
prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
|
|
err = security_bpf_prog_alloc(prog->aux);
|
if (err)
|
goto free_prog_nouncharge;
|
|
err = bpf_prog_charge_memlock(prog);
|
if (err)
|
goto free_prog_sec;
|
|
prog->len = attr->insn_cnt;
|
|
err = -EFAULT;
|
if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
|
bpf_prog_insn_size(prog)) != 0)
|
goto free_prog;
|
|
prog->orig_prog = NULL;
|
prog->jited = 0;
|
|
atomic64_set(&prog->aux->refcnt, 1);
|
prog->gpl_compatible = is_gpl ? 1 : 0;
|
|
if (bpf_prog_is_dev_bound(prog->aux)) {
|
err = bpf_prog_offload_init(prog, attr);
|
if (err)
|
goto free_prog;
|
}
|
|
/* find program type: socket_filter vs tracing_filter */
|
err = find_prog_type(type, prog);
|
if (err < 0)
|
goto free_prog;
|
|
prog->aux->load_time = ktime_get_boottime_ns();
|
err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
|
sizeof(attr->prog_name));
|
if (err < 0)
|
goto free_prog;
|
|
/* run eBPF verifier */
|
err = bpf_check(&prog, attr, uattr);
|
if (err < 0)
|
goto free_used_maps;
|
|
prog = bpf_prog_select_runtime(prog, &err);
|
if (err < 0)
|
goto free_used_maps;
|
|
err = bpf_prog_alloc_id(prog);
|
if (err)
|
goto free_used_maps;
|
|
/* Upon success of bpf_prog_alloc_id(), the BPF prog is
|
* effectively publicly exposed. However, retrieving via
|
* bpf_prog_get_fd_by_id() will take another reference,
|
* therefore it cannot be gone underneath us.
|
*
|
* Only for the time /after/ successful bpf_prog_new_fd()
|
* and before returning to userspace, we might just hold
|
* one reference and any parallel close on that fd could
|
* rip everything out. Hence, below notifications must
|
* happen before bpf_prog_new_fd().
|
*
|
* Also, any failure handling from this point onwards must
|
* be using bpf_prog_put() given the program is exposed.
|
*/
|
bpf_prog_kallsyms_add(prog);
|
perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
|
bpf_audit_prog(prog, BPF_AUDIT_LOAD);
|
|
err = bpf_prog_new_fd(prog);
|
if (err < 0)
|
bpf_prog_put(prog);
|
return err;
|
|
free_used_maps:
|
/* In case we have subprogs, we need to wait for a grace
|
* period before we can tear down JIT memory since symbols
|
* are already exposed under kallsyms.
|
*/
|
__bpf_prog_put_noref(prog, prog->aux->func_cnt);
|
return err;
|
free_prog:
|
bpf_prog_uncharge_memlock(prog);
|
free_prog_sec:
|
security_bpf_prog_free(prog->aux);
|
free_prog_nouncharge:
|
bpf_prog_free(prog);
|
return err;
|
}
|
|
#define BPF_OBJ_LAST_FIELD file_flags
|
|
static int bpf_obj_pin(const union bpf_attr *attr)
|
{
|
if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
|
return -EINVAL;
|
|
return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
|
}
|
|
static int bpf_obj_get(const union bpf_attr *attr)
|
{
|
if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
|
attr->file_flags & ~BPF_OBJ_FLAG_MASK)
|
return -EINVAL;
|
|
return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
|
attr->file_flags);
|
}
|
|
void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
|
const struct bpf_link_ops *ops, struct bpf_prog *prog)
|
{
|
atomic64_set(&link->refcnt, 1);
|
link->type = type;
|
link->id = 0;
|
link->ops = ops;
|
link->prog = prog;
|
}
|
|
static void bpf_link_free_id(int id)
|
{
|
if (!id)
|
return;
|
|
spin_lock_bh(&link_idr_lock);
|
idr_remove(&link_idr, id);
|
spin_unlock_bh(&link_idr_lock);
|
}
|
|
/* Clean up bpf_link and corresponding anon_inode file and FD. After
|
* anon_inode is created, bpf_link can't be just kfree()'d due to deferred
|
* anon_inode's release() call. This helper marksbpf_link as
|
* defunct, releases anon_inode file and puts reserved FD. bpf_prog's refcnt
|
* is not decremented, it's the responsibility of a calling code that failed
|
* to complete bpf_link initialization.
|
*/
|
void bpf_link_cleanup(struct bpf_link_primer *primer)
|
{
|
primer->link->prog = NULL;
|
bpf_link_free_id(primer->id);
|
fput(primer->file);
|
put_unused_fd(primer->fd);
|
}
|
|
void bpf_link_inc(struct bpf_link *link)
|
{
|
atomic64_inc(&link->refcnt);
|
}
|
|
/* bpf_link_free is guaranteed to be called from process context */
|
static void bpf_link_free(struct bpf_link *link)
|
{
|
bpf_link_free_id(link->id);
|
if (link->prog) {
|
/* detach BPF program, clean up used resources */
|
link->ops->release(link);
|
bpf_prog_put(link->prog);
|
}
|
/* free bpf_link and its containing memory */
|
link->ops->dealloc(link);
|
}
|
|
static void bpf_link_put_deferred(struct work_struct *work)
|
{
|
struct bpf_link *link = container_of(work, struct bpf_link, work);
|
|
bpf_link_free(link);
|
}
|
|
/* bpf_link_put can be called from atomic context, but ensures that resources
|
* are freed from process context
|
*/
|
void bpf_link_put(struct bpf_link *link)
|
{
|
if (!atomic64_dec_and_test(&link->refcnt))
|
return;
|
|
if (in_atomic()) {
|
INIT_WORK(&link->work, bpf_link_put_deferred);
|
schedule_work(&link->work);
|
} else {
|
bpf_link_free(link);
|
}
|
}
|
|
static int bpf_link_release(struct inode *inode, struct file *filp)
|
{
|
struct bpf_link *link = filp->private_data;
|
|
bpf_link_put(link);
|
return 0;
|
}
|
|
#ifdef CONFIG_PROC_FS
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
|
#define BPF_MAP_TYPE(_id, _ops)
|
#define BPF_LINK_TYPE(_id, _name) [_id] = #_name,
|
static const char *bpf_link_type_strs[] = {
|
[BPF_LINK_TYPE_UNSPEC] = "<invalid>",
|
#include <linux/bpf_types.h>
|
};
|
#undef BPF_PROG_TYPE
|
#undef BPF_MAP_TYPE
|
#undef BPF_LINK_TYPE
|
|
static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
|
{
|
const struct bpf_link *link = filp->private_data;
|
const struct bpf_prog *prog = link->prog;
|
char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
|
|
bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
|
seq_printf(m,
|
"link_type:\t%s\n"
|
"link_id:\t%u\n"
|
"prog_tag:\t%s\n"
|
"prog_id:\t%u\n",
|
bpf_link_type_strs[link->type],
|
link->id,
|
prog_tag,
|
prog->aux->id);
|
if (link->ops->show_fdinfo)
|
link->ops->show_fdinfo(link, m);
|
}
|
#endif
|
|
static const struct file_operations bpf_link_fops = {
|
#ifdef CONFIG_PROC_FS
|
.show_fdinfo = bpf_link_show_fdinfo,
|
#endif
|
.release = bpf_link_release,
|
.read = bpf_dummy_read,
|
.write = bpf_dummy_write,
|
};
|
|
static int bpf_link_alloc_id(struct bpf_link *link)
|
{
|
int id;
|
|
idr_preload(GFP_KERNEL);
|
spin_lock_bh(&link_idr_lock);
|
id = idr_alloc_cyclic(&link_idr, link, 1, INT_MAX, GFP_ATOMIC);
|
spin_unlock_bh(&link_idr_lock);
|
idr_preload_end();
|
|
return id;
|
}
|
|
/* Prepare bpf_link to be exposed to user-space by allocating anon_inode file,
|
* reserving unused FD and allocating ID from link_idr. This is to be paired
|
* with bpf_link_settle() to install FD and ID and expose bpf_link to
|
* user-space, if bpf_link is successfully attached. If not, bpf_link and
|
* pre-allocated resources are to be freed with bpf_cleanup() call. All the
|
* transient state is passed around in struct bpf_link_primer.
|
* This is preferred way to create and initialize bpf_link, especially when
|
* there are complicated and expensive operations inbetween creating bpf_link
|
* itself and attaching it to BPF hook. By using bpf_link_prime() and
|
* bpf_link_settle() kernel code using bpf_link doesn't have to perform
|
* expensive (and potentially failing) roll back operations in a rare case
|
* that file, FD, or ID can't be allocated.
|
*/
|
int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer)
|
{
|
struct file *file;
|
int fd, id;
|
|
fd = get_unused_fd_flags(O_CLOEXEC);
|
if (fd < 0)
|
return fd;
|
|
|
id = bpf_link_alloc_id(link);
|
if (id < 0) {
|
put_unused_fd(fd);
|
return id;
|
}
|
|
file = anon_inode_getfile("bpf_link", &bpf_link_fops, link, O_CLOEXEC);
|
if (IS_ERR(file)) {
|
bpf_link_free_id(id);
|
put_unused_fd(fd);
|
return PTR_ERR(file);
|
}
|
|
primer->link = link;
|
primer->file = file;
|
primer->fd = fd;
|
primer->id = id;
|
return 0;
|
}
|
|
int bpf_link_settle(struct bpf_link_primer *primer)
|
{
|
/* make bpf_link fetchable by ID */
|
spin_lock_bh(&link_idr_lock);
|
primer->link->id = primer->id;
|
spin_unlock_bh(&link_idr_lock);
|
/* make bpf_link fetchable by FD */
|
fd_install(primer->fd, primer->file);
|
/* pass through installed FD */
|
return primer->fd;
|
}
|
|
int bpf_link_new_fd(struct bpf_link *link)
|
{
|
return anon_inode_getfd("bpf-link", &bpf_link_fops, link, O_CLOEXEC);
|
}
|
|
struct bpf_link *bpf_link_get_from_fd(u32 ufd)
|
{
|
struct fd f = fdget(ufd);
|
struct bpf_link *link;
|
|
if (!f.file)
|
return ERR_PTR(-EBADF);
|
if (f.file->f_op != &bpf_link_fops) {
|
fdput(f);
|
return ERR_PTR(-EINVAL);
|
}
|
|
link = f.file->private_data;
|
bpf_link_inc(link);
|
fdput(f);
|
|
return link;
|
}
|
|
struct bpf_tracing_link {
|
struct bpf_link link;
|
enum bpf_attach_type attach_type;
|
struct bpf_trampoline *trampoline;
|
struct bpf_prog *tgt_prog;
|
};
|
|
static void bpf_tracing_link_release(struct bpf_link *link)
|
{
|
struct bpf_tracing_link *tr_link =
|
container_of(link, struct bpf_tracing_link, link);
|
|
WARN_ON_ONCE(bpf_trampoline_unlink_prog(link->prog,
|
tr_link->trampoline));
|
|
bpf_trampoline_put(tr_link->trampoline);
|
|
/* tgt_prog is NULL if target is a kernel function */
|
if (tr_link->tgt_prog)
|
bpf_prog_put(tr_link->tgt_prog);
|
}
|
|
static void bpf_tracing_link_dealloc(struct bpf_link *link)
|
{
|
struct bpf_tracing_link *tr_link =
|
container_of(link, struct bpf_tracing_link, link);
|
|
kfree(tr_link);
|
}
|
|
static void bpf_tracing_link_show_fdinfo(const struct bpf_link *link,
|
struct seq_file *seq)
|
{
|
struct bpf_tracing_link *tr_link =
|
container_of(link, struct bpf_tracing_link, link);
|
|
seq_printf(seq,
|
"attach_type:\t%d\n",
|
tr_link->attach_type);
|
}
|
|
static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
|
struct bpf_link_info *info)
|
{
|
struct bpf_tracing_link *tr_link =
|
container_of(link, struct bpf_tracing_link, link);
|
|
info->tracing.attach_type = tr_link->attach_type;
|
|
return 0;
|
}
|
|
static const struct bpf_link_ops bpf_tracing_link_lops = {
|
.release = bpf_tracing_link_release,
|
.dealloc = bpf_tracing_link_dealloc,
|
.show_fdinfo = bpf_tracing_link_show_fdinfo,
|
.fill_link_info = bpf_tracing_link_fill_link_info,
|
};
|
|
static int bpf_tracing_prog_attach(struct bpf_prog *prog,
|
int tgt_prog_fd,
|
u32 btf_id)
|
{
|
struct bpf_link_primer link_primer;
|
struct bpf_prog *tgt_prog = NULL;
|
struct bpf_trampoline *tr = NULL;
|
struct bpf_tracing_link *link;
|
u64 key = 0;
|
int err;
|
|
switch (prog->type) {
|
case BPF_PROG_TYPE_TRACING:
|
if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
|
prog->expected_attach_type != BPF_TRACE_FEXIT &&
|
prog->expected_attach_type != BPF_MODIFY_RETURN) {
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
break;
|
case BPF_PROG_TYPE_EXT:
|
if (prog->expected_attach_type != 0) {
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
break;
|
case BPF_PROG_TYPE_LSM:
|
if (prog->expected_attach_type != BPF_LSM_MAC) {
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
break;
|
default:
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
|
if (!!tgt_prog_fd != !!btf_id) {
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
|
if (tgt_prog_fd) {
|
/* For now we only allow new targets for BPF_PROG_TYPE_EXT */
|
if (prog->type != BPF_PROG_TYPE_EXT) {
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
|
tgt_prog = bpf_prog_get(tgt_prog_fd);
|
if (IS_ERR(tgt_prog)) {
|
err = PTR_ERR(tgt_prog);
|
tgt_prog = NULL;
|
goto out_put_prog;
|
}
|
|
key = bpf_trampoline_compute_key(tgt_prog, btf_id);
|
}
|
|
link = kzalloc(sizeof(*link), GFP_USER);
|
if (!link) {
|
err = -ENOMEM;
|
goto out_put_prog;
|
}
|
bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING,
|
&bpf_tracing_link_lops, prog);
|
link->attach_type = prog->expected_attach_type;
|
|
mutex_lock(&prog->aux->dst_mutex);
|
|
/* There are a few possible cases here:
|
*
|
* - if prog->aux->dst_trampoline is set, the program was just loaded
|
* and not yet attached to anything, so we can use the values stored
|
* in prog->aux
|
*
|
* - if prog->aux->dst_trampoline is NULL, the program has already been
|
* attached to a target and its initial target was cleared (below)
|
*
|
* - if tgt_prog != NULL, the caller specified tgt_prog_fd +
|
* target_btf_id using the link_create API.
|
*
|
* - if tgt_prog == NULL when this function was called using the old
|
* raw_tracepoint_open API, and we need a target from prog->aux
|
*
|
* The combination of no saved target in prog->aux, and no target
|
* specified on load is illegal, and we reject that here.
|
*/
|
if (!prog->aux->dst_trampoline && !tgt_prog) {
|
err = -ENOENT;
|
goto out_unlock;
|
}
|
|
if (!prog->aux->dst_trampoline ||
|
(key && key != prog->aux->dst_trampoline->key)) {
|
/* If there is no saved target, or the specified target is
|
* different from the destination specified at load time, we
|
* need a new trampoline and a check for compatibility
|
*/
|
struct bpf_attach_target_info tgt_info = {};
|
|
err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
|
&tgt_info);
|
if (err)
|
goto out_unlock;
|
|
tr = bpf_trampoline_get(key, &tgt_info);
|
if (!tr) {
|
err = -ENOMEM;
|
goto out_unlock;
|
}
|
} else {
|
/* The caller didn't specify a target, or the target was the
|
* same as the destination supplied during program load. This
|
* means we can reuse the trampoline and reference from program
|
* load time, and there is no need to allocate a new one. This
|
* can only happen once for any program, as the saved values in
|
* prog->aux are cleared below.
|
*/
|
tr = prog->aux->dst_trampoline;
|
tgt_prog = prog->aux->dst_prog;
|
}
|
|
err = bpf_link_prime(&link->link, &link_primer);
|
if (err)
|
goto out_unlock;
|
|
err = bpf_trampoline_link_prog(prog, tr);
|
if (err) {
|
bpf_link_cleanup(&link_primer);
|
link = NULL;
|
goto out_unlock;
|
}
|
|
link->tgt_prog = tgt_prog;
|
link->trampoline = tr;
|
|
/* Always clear the trampoline and target prog from prog->aux to make
|
* sure the original attach destination is not kept alive after a
|
* program is (re-)attached to another target.
|
*/
|
if (prog->aux->dst_prog &&
|
(tgt_prog_fd || tr != prog->aux->dst_trampoline))
|
/* got extra prog ref from syscall, or attaching to different prog */
|
bpf_prog_put(prog->aux->dst_prog);
|
if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
|
/* we allocated a new trampoline, so free the old one */
|
bpf_trampoline_put(prog->aux->dst_trampoline);
|
|
prog->aux->dst_prog = NULL;
|
prog->aux->dst_trampoline = NULL;
|
mutex_unlock(&prog->aux->dst_mutex);
|
|
return bpf_link_settle(&link_primer);
|
out_unlock:
|
if (tr && tr != prog->aux->dst_trampoline)
|
bpf_trampoline_put(tr);
|
mutex_unlock(&prog->aux->dst_mutex);
|
kfree(link);
|
out_put_prog:
|
if (tgt_prog_fd && tgt_prog)
|
bpf_prog_put(tgt_prog);
|
return err;
|
}
|
|
struct bpf_raw_tp_link {
|
struct bpf_link link;
|
struct bpf_raw_event_map *btp;
|
};
|
|
static void bpf_raw_tp_link_release(struct bpf_link *link)
|
{
|
struct bpf_raw_tp_link *raw_tp =
|
container_of(link, struct bpf_raw_tp_link, link);
|
|
bpf_probe_unregister(raw_tp->btp, raw_tp->link.prog);
|
bpf_put_raw_tracepoint(raw_tp->btp);
|
}
|
|
static void bpf_raw_tp_link_dealloc(struct bpf_link *link)
|
{
|
struct bpf_raw_tp_link *raw_tp =
|
container_of(link, struct bpf_raw_tp_link, link);
|
|
kfree(raw_tp);
|
}
|
|
static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
|
struct seq_file *seq)
|
{
|
struct bpf_raw_tp_link *raw_tp_link =
|
container_of(link, struct bpf_raw_tp_link, link);
|
|
seq_printf(seq,
|
"tp_name:\t%s\n",
|
raw_tp_link->btp->tp->name);
|
}
|
|
static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
|
struct bpf_link_info *info)
|
{
|
struct bpf_raw_tp_link *raw_tp_link =
|
container_of(link, struct bpf_raw_tp_link, link);
|
char __user *ubuf = u64_to_user_ptr(info->raw_tracepoint.tp_name);
|
const char *tp_name = raw_tp_link->btp->tp->name;
|
u32 ulen = info->raw_tracepoint.tp_name_len;
|
size_t tp_len = strlen(tp_name);
|
|
if (!ulen ^ !ubuf)
|
return -EINVAL;
|
|
info->raw_tracepoint.tp_name_len = tp_len + 1;
|
|
if (!ubuf)
|
return 0;
|
|
if (ulen >= tp_len + 1) {
|
if (copy_to_user(ubuf, tp_name, tp_len + 1))
|
return -EFAULT;
|
} else {
|
char zero = '\0';
|
|
if (copy_to_user(ubuf, tp_name, ulen - 1))
|
return -EFAULT;
|
if (put_user(zero, ubuf + ulen - 1))
|
return -EFAULT;
|
return -ENOSPC;
|
}
|
|
return 0;
|
}
|
|
static const struct bpf_link_ops bpf_raw_tp_link_lops = {
|
.release = bpf_raw_tp_link_release,
|
.dealloc = bpf_raw_tp_link_dealloc,
|
.show_fdinfo = bpf_raw_tp_link_show_fdinfo,
|
.fill_link_info = bpf_raw_tp_link_fill_link_info,
|
};
|
|
#define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
|
|
static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
|
{
|
struct bpf_link_primer link_primer;
|
struct bpf_raw_tp_link *link;
|
struct bpf_raw_event_map *btp;
|
struct bpf_prog *prog;
|
const char *tp_name;
|
char buf[128];
|
int err;
|
|
if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN))
|
return -EINVAL;
|
|
prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
|
if (IS_ERR(prog))
|
return PTR_ERR(prog);
|
|
switch (prog->type) {
|
case BPF_PROG_TYPE_TRACING:
|
case BPF_PROG_TYPE_EXT:
|
case BPF_PROG_TYPE_LSM:
|
if (attr->raw_tracepoint.name) {
|
/* The attach point for this category of programs
|
* should be specified via btf_id during program load.
|
*/
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
if (prog->type == BPF_PROG_TYPE_TRACING &&
|
prog->expected_attach_type == BPF_TRACE_RAW_TP) {
|
tp_name = prog->aux->attach_func_name;
|
break;
|
}
|
err = bpf_tracing_prog_attach(prog, 0, 0);
|
if (err >= 0)
|
return err;
|
goto out_put_prog;
|
case BPF_PROG_TYPE_RAW_TRACEPOINT:
|
case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
|
if (strncpy_from_user(buf,
|
u64_to_user_ptr(attr->raw_tracepoint.name),
|
sizeof(buf) - 1) < 0) {
|
err = -EFAULT;
|
goto out_put_prog;
|
}
|
buf[sizeof(buf) - 1] = 0;
|
tp_name = buf;
|
break;
|
default:
|
err = -EINVAL;
|
goto out_put_prog;
|
}
|
|
btp = bpf_get_raw_tracepoint(tp_name);
|
if (!btp) {
|
err = -ENOENT;
|
goto out_put_prog;
|
}
|
|
link = kzalloc(sizeof(*link), GFP_USER);
|
if (!link) {
|
err = -ENOMEM;
|
goto out_put_btp;
|
}
|
bpf_link_init(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
|
&bpf_raw_tp_link_lops, prog);
|
link->btp = btp;
|
|
err = bpf_link_prime(&link->link, &link_primer);
|
if (err) {
|
kfree(link);
|
goto out_put_btp;
|
}
|
|
err = bpf_probe_register(link->btp, prog);
|
if (err) {
|
bpf_link_cleanup(&link_primer);
|
goto out_put_btp;
|
}
|
|
return bpf_link_settle(&link_primer);
|
|
out_put_btp:
|
bpf_put_raw_tracepoint(btp);
|
out_put_prog:
|
bpf_prog_put(prog);
|
return err;
|
}
|
|
static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
|
enum bpf_attach_type attach_type)
|
{
|
switch (prog->type) {
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
|
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
|
case BPF_PROG_TYPE_SK_LOOKUP:
|
return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
|
case BPF_PROG_TYPE_CGROUP_SKB:
|
if (!capable(CAP_NET_ADMIN))
|
/* cg-skb progs can be loaded by unpriv user.
|
* check permissions at attach time.
|
*/
|
return -EPERM;
|
return prog->enforce_expected_attach_type &&
|
prog->expected_attach_type != attach_type ?
|
-EINVAL : 0;
|
default:
|
return 0;
|
}
|
}
|
|
static enum bpf_prog_type
|
attach_type_to_prog_type(enum bpf_attach_type attach_type)
|
{
|
switch (attach_type) {
|
case BPF_CGROUP_INET_INGRESS:
|
case BPF_CGROUP_INET_EGRESS:
|
return BPF_PROG_TYPE_CGROUP_SKB;
|
case BPF_CGROUP_INET_SOCK_CREATE:
|
case BPF_CGROUP_INET_SOCK_RELEASE:
|
case BPF_CGROUP_INET4_POST_BIND:
|
case BPF_CGROUP_INET6_POST_BIND:
|
return BPF_PROG_TYPE_CGROUP_SOCK;
|
case BPF_CGROUP_INET4_BIND:
|
case BPF_CGROUP_INET6_BIND:
|
case BPF_CGROUP_INET4_CONNECT:
|
case BPF_CGROUP_INET6_CONNECT:
|
case BPF_CGROUP_INET4_GETPEERNAME:
|
case BPF_CGROUP_INET6_GETPEERNAME:
|
case BPF_CGROUP_INET4_GETSOCKNAME:
|
case BPF_CGROUP_INET6_GETSOCKNAME:
|
case BPF_CGROUP_UDP4_SENDMSG:
|
case BPF_CGROUP_UDP6_SENDMSG:
|
case BPF_CGROUP_UDP4_RECVMSG:
|
case BPF_CGROUP_UDP6_RECVMSG:
|
return BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
|
case BPF_CGROUP_SOCK_OPS:
|
return BPF_PROG_TYPE_SOCK_OPS;
|
case BPF_CGROUP_DEVICE:
|
return BPF_PROG_TYPE_CGROUP_DEVICE;
|
case BPF_SK_MSG_VERDICT:
|
return BPF_PROG_TYPE_SK_MSG;
|
case BPF_SK_SKB_STREAM_PARSER:
|
case BPF_SK_SKB_STREAM_VERDICT:
|
return BPF_PROG_TYPE_SK_SKB;
|
case BPF_LIRC_MODE2:
|
return BPF_PROG_TYPE_LIRC_MODE2;
|
case BPF_FLOW_DISSECTOR:
|
return BPF_PROG_TYPE_FLOW_DISSECTOR;
|
case BPF_CGROUP_SYSCTL:
|
return BPF_PROG_TYPE_CGROUP_SYSCTL;
|
case BPF_CGROUP_GETSOCKOPT:
|
case BPF_CGROUP_SETSOCKOPT:
|
return BPF_PROG_TYPE_CGROUP_SOCKOPT;
|
case BPF_TRACE_ITER:
|
return BPF_PROG_TYPE_TRACING;
|
case BPF_SK_LOOKUP:
|
return BPF_PROG_TYPE_SK_LOOKUP;
|
case BPF_XDP:
|
return BPF_PROG_TYPE_XDP;
|
default:
|
return BPF_PROG_TYPE_UNSPEC;
|
}
|
}
|
|
#define BPF_PROG_ATTACH_LAST_FIELD replace_bpf_fd
|
|
#define BPF_F_ATTACH_MASK \
|
(BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI | BPF_F_REPLACE)
|
|
static int bpf_prog_attach(const union bpf_attr *attr)
|
{
|
enum bpf_prog_type ptype;
|
struct bpf_prog *prog;
|
int ret;
|
|
if (CHECK_ATTR(BPF_PROG_ATTACH))
|
return -EINVAL;
|
|
if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
|
return -EINVAL;
|
|
ptype = attach_type_to_prog_type(attr->attach_type);
|
if (ptype == BPF_PROG_TYPE_UNSPEC)
|
return -EINVAL;
|
|
prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
|
if (IS_ERR(prog))
|
return PTR_ERR(prog);
|
|
if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
|
bpf_prog_put(prog);
|
return -EINVAL;
|
}
|
|
switch (ptype) {
|
case BPF_PROG_TYPE_SK_SKB:
|
case BPF_PROG_TYPE_SK_MSG:
|
ret = sock_map_get_from_fd(attr, prog);
|
break;
|
case BPF_PROG_TYPE_LIRC_MODE2:
|
ret = lirc_prog_attach(attr, prog);
|
break;
|
case BPF_PROG_TYPE_FLOW_DISSECTOR:
|
ret = netns_bpf_prog_attach(attr, prog);
|
break;
|
case BPF_PROG_TYPE_CGROUP_DEVICE:
|
case BPF_PROG_TYPE_CGROUP_SKB:
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
|
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
|
case BPF_PROG_TYPE_CGROUP_SYSCTL:
|
case BPF_PROG_TYPE_SOCK_OPS:
|
ret = cgroup_bpf_prog_attach(attr, ptype, prog);
|
break;
|
default:
|
ret = -EINVAL;
|
}
|
|
if (ret)
|
bpf_prog_put(prog);
|
return ret;
|
}
|
|
#define BPF_PROG_DETACH_LAST_FIELD attach_type
|
|
static int bpf_prog_detach(const union bpf_attr *attr)
|
{
|
enum bpf_prog_type ptype;
|
|
if (CHECK_ATTR(BPF_PROG_DETACH))
|
return -EINVAL;
|
|
ptype = attach_type_to_prog_type(attr->attach_type);
|
|
switch (ptype) {
|
case BPF_PROG_TYPE_SK_MSG:
|
case BPF_PROG_TYPE_SK_SKB:
|
return sock_map_prog_detach(attr, ptype);
|
case BPF_PROG_TYPE_LIRC_MODE2:
|
return lirc_prog_detach(attr);
|
case BPF_PROG_TYPE_FLOW_DISSECTOR:
|
return netns_bpf_prog_detach(attr, ptype);
|
case BPF_PROG_TYPE_CGROUP_DEVICE:
|
case BPF_PROG_TYPE_CGROUP_SKB:
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
|
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
|
case BPF_PROG_TYPE_CGROUP_SYSCTL:
|
case BPF_PROG_TYPE_SOCK_OPS:
|
return cgroup_bpf_prog_detach(attr, ptype);
|
default:
|
return -EINVAL;
|
}
|
}
|
|
#define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
|
|
static int bpf_prog_query(const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
if (!capable(CAP_NET_ADMIN))
|
return -EPERM;
|
if (CHECK_ATTR(BPF_PROG_QUERY))
|
return -EINVAL;
|
if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
|
return -EINVAL;
|
|
switch (attr->query.attach_type) {
|
case BPF_CGROUP_INET_INGRESS:
|
case BPF_CGROUP_INET_EGRESS:
|
case BPF_CGROUP_INET_SOCK_CREATE:
|
case BPF_CGROUP_INET_SOCK_RELEASE:
|
case BPF_CGROUP_INET4_BIND:
|
case BPF_CGROUP_INET6_BIND:
|
case BPF_CGROUP_INET4_POST_BIND:
|
case BPF_CGROUP_INET6_POST_BIND:
|
case BPF_CGROUP_INET4_CONNECT:
|
case BPF_CGROUP_INET6_CONNECT:
|
case BPF_CGROUP_INET4_GETPEERNAME:
|
case BPF_CGROUP_INET6_GETPEERNAME:
|
case BPF_CGROUP_INET4_GETSOCKNAME:
|
case BPF_CGROUP_INET6_GETSOCKNAME:
|
case BPF_CGROUP_UDP4_SENDMSG:
|
case BPF_CGROUP_UDP6_SENDMSG:
|
case BPF_CGROUP_UDP4_RECVMSG:
|
case BPF_CGROUP_UDP6_RECVMSG:
|
case BPF_CGROUP_SOCK_OPS:
|
case BPF_CGROUP_DEVICE:
|
case BPF_CGROUP_SYSCTL:
|
case BPF_CGROUP_GETSOCKOPT:
|
case BPF_CGROUP_SETSOCKOPT:
|
return cgroup_bpf_prog_query(attr, uattr);
|
case BPF_LIRC_MODE2:
|
return lirc_prog_query(attr, uattr);
|
case BPF_FLOW_DISSECTOR:
|
case BPF_SK_LOOKUP:
|
return netns_bpf_prog_query(attr, uattr);
|
default:
|
return -EINVAL;
|
}
|
}
|
|
#define BPF_PROG_TEST_RUN_LAST_FIELD test.cpu
|
|
static int bpf_prog_test_run(const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
struct bpf_prog *prog;
|
int ret = -ENOTSUPP;
|
|
if (CHECK_ATTR(BPF_PROG_TEST_RUN))
|
return -EINVAL;
|
|
if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
|
(!attr->test.ctx_size_in && attr->test.ctx_in))
|
return -EINVAL;
|
|
if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
|
(!attr->test.ctx_size_out && attr->test.ctx_out))
|
return -EINVAL;
|
|
prog = bpf_prog_get(attr->test.prog_fd);
|
if (IS_ERR(prog))
|
return PTR_ERR(prog);
|
|
if (prog->aux->ops->test_run)
|
ret = prog->aux->ops->test_run(prog, attr, uattr);
|
|
bpf_prog_put(prog);
|
return ret;
|
}
|
|
#define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
|
|
static int bpf_obj_get_next_id(const union bpf_attr *attr,
|
union bpf_attr __user *uattr,
|
struct idr *idr,
|
spinlock_t *lock)
|
{
|
u32 next_id = attr->start_id;
|
int err = 0;
|
|
if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
next_id++;
|
spin_lock_bh(lock);
|
if (!idr_get_next(idr, &next_id))
|
err = -ENOENT;
|
spin_unlock_bh(lock);
|
|
if (!err)
|
err = put_user(next_id, &uattr->next_id);
|
|
return err;
|
}
|
|
struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
|
{
|
struct bpf_map *map;
|
|
spin_lock_bh(&map_idr_lock);
|
again:
|
map = idr_get_next(&map_idr, id);
|
if (map) {
|
map = __bpf_map_inc_not_zero(map, false);
|
if (IS_ERR(map)) {
|
(*id)++;
|
goto again;
|
}
|
}
|
spin_unlock_bh(&map_idr_lock);
|
|
return map;
|
}
|
|
struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id)
|
{
|
struct bpf_prog *prog;
|
|
spin_lock_bh(&prog_idr_lock);
|
again:
|
prog = idr_get_next(&prog_idr, id);
|
if (prog) {
|
prog = bpf_prog_inc_not_zero(prog);
|
if (IS_ERR(prog)) {
|
(*id)++;
|
goto again;
|
}
|
}
|
spin_unlock_bh(&prog_idr_lock);
|
|
return prog;
|
}
|
|
#define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
|
|
struct bpf_prog *bpf_prog_by_id(u32 id)
|
{
|
struct bpf_prog *prog;
|
|
if (!id)
|
return ERR_PTR(-ENOENT);
|
|
spin_lock_bh(&prog_idr_lock);
|
prog = idr_find(&prog_idr, id);
|
if (prog)
|
prog = bpf_prog_inc_not_zero(prog);
|
else
|
prog = ERR_PTR(-ENOENT);
|
spin_unlock_bh(&prog_idr_lock);
|
return prog;
|
}
|
|
static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
|
{
|
struct bpf_prog *prog;
|
u32 id = attr->prog_id;
|
int fd;
|
|
if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
prog = bpf_prog_by_id(id);
|
if (IS_ERR(prog))
|
return PTR_ERR(prog);
|
|
fd = bpf_prog_new_fd(prog);
|
if (fd < 0)
|
bpf_prog_put(prog);
|
|
return fd;
|
}
|
|
#define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
|
|
static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
|
{
|
struct bpf_map *map;
|
u32 id = attr->map_id;
|
int f_flags;
|
int fd;
|
|
if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
|
attr->open_flags & ~BPF_OBJ_FLAG_MASK)
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
f_flags = bpf_get_file_flag(attr->open_flags);
|
if (f_flags < 0)
|
return f_flags;
|
|
spin_lock_bh(&map_idr_lock);
|
map = idr_find(&map_idr, id);
|
if (map)
|
map = __bpf_map_inc_not_zero(map, true);
|
else
|
map = ERR_PTR(-ENOENT);
|
spin_unlock_bh(&map_idr_lock);
|
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
|
fd = bpf_map_new_fd(map, f_flags);
|
if (fd < 0)
|
bpf_map_put_with_uref(map);
|
|
return fd;
|
}
|
|
static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
|
unsigned long addr, u32 *off,
|
u32 *type)
|
{
|
const struct bpf_map *map;
|
int i;
|
|
mutex_lock(&prog->aux->used_maps_mutex);
|
for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
|
map = prog->aux->used_maps[i];
|
if (map == (void *)addr) {
|
*type = BPF_PSEUDO_MAP_FD;
|
goto out;
|
}
|
if (!map->ops->map_direct_value_meta)
|
continue;
|
if (!map->ops->map_direct_value_meta(map, addr, off)) {
|
*type = BPF_PSEUDO_MAP_VALUE;
|
goto out;
|
}
|
}
|
map = NULL;
|
|
out:
|
mutex_unlock(&prog->aux->used_maps_mutex);
|
return map;
|
}
|
|
static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
|
const struct cred *f_cred)
|
{
|
const struct bpf_map *map;
|
struct bpf_insn *insns;
|
u32 off, type;
|
u64 imm;
|
u8 code;
|
int i;
|
|
insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
|
GFP_USER);
|
if (!insns)
|
return insns;
|
|
for (i = 0; i < prog->len; i++) {
|
code = insns[i].code;
|
|
if (code == (BPF_JMP | BPF_TAIL_CALL)) {
|
insns[i].code = BPF_JMP | BPF_CALL;
|
insns[i].imm = BPF_FUNC_tail_call;
|
/* fall-through */
|
}
|
if (code == (BPF_JMP | BPF_CALL) ||
|
code == (BPF_JMP | BPF_CALL_ARGS)) {
|
if (code == (BPF_JMP | BPF_CALL_ARGS))
|
insns[i].code = BPF_JMP | BPF_CALL;
|
if (!bpf_dump_raw_ok(f_cred))
|
insns[i].imm = 0;
|
continue;
|
}
|
if (BPF_CLASS(code) == BPF_LDX && BPF_MODE(code) == BPF_PROBE_MEM) {
|
insns[i].code = BPF_LDX | BPF_SIZE(code) | BPF_MEM;
|
continue;
|
}
|
|
if (code != (BPF_LD | BPF_IMM | BPF_DW))
|
continue;
|
|
imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
|
map = bpf_map_from_imm(prog, imm, &off, &type);
|
if (map) {
|
insns[i].src_reg = type;
|
insns[i].imm = map->id;
|
insns[i + 1].imm = off;
|
continue;
|
}
|
}
|
|
return insns;
|
}
|
|
static int set_info_rec_size(struct bpf_prog_info *info)
|
{
|
/*
|
* Ensure info.*_rec_size is the same as kernel expected size
|
*
|
* or
|
*
|
* Only allow zero *_rec_size if both _rec_size and _cnt are
|
* zero. In this case, the kernel will set the expected
|
* _rec_size back to the info.
|
*/
|
|
if ((info->nr_func_info || info->func_info_rec_size) &&
|
info->func_info_rec_size != sizeof(struct bpf_func_info))
|
return -EINVAL;
|
|
if ((info->nr_line_info || info->line_info_rec_size) &&
|
info->line_info_rec_size != sizeof(struct bpf_line_info))
|
return -EINVAL;
|
|
if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
|
info->jited_line_info_rec_size != sizeof(__u64))
|
return -EINVAL;
|
|
info->func_info_rec_size = sizeof(struct bpf_func_info);
|
info->line_info_rec_size = sizeof(struct bpf_line_info);
|
info->jited_line_info_rec_size = sizeof(__u64);
|
|
return 0;
|
}
|
|
static int bpf_prog_get_info_by_fd(struct file *file,
|
struct bpf_prog *prog,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
|
struct bpf_prog_info info;
|
u32 info_len = attr->info.info_len;
|
struct bpf_prog_stats stats;
|
char __user *uinsns;
|
u32 ulen;
|
int err;
|
|
err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
|
if (err)
|
return err;
|
info_len = min_t(u32, sizeof(info), info_len);
|
|
memset(&info, 0, sizeof(info));
|
if (copy_from_user(&info, uinfo, info_len))
|
return -EFAULT;
|
|
info.type = prog->type;
|
info.id = prog->aux->id;
|
info.load_time = prog->aux->load_time;
|
info.created_by_uid = from_kuid_munged(current_user_ns(),
|
prog->aux->user->uid);
|
info.gpl_compatible = prog->gpl_compatible;
|
|
memcpy(info.tag, prog->tag, sizeof(prog->tag));
|
memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
|
|
mutex_lock(&prog->aux->used_maps_mutex);
|
ulen = info.nr_map_ids;
|
info.nr_map_ids = prog->aux->used_map_cnt;
|
ulen = min_t(u32, info.nr_map_ids, ulen);
|
if (ulen) {
|
u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
|
u32 i;
|
|
for (i = 0; i < ulen; i++)
|
if (put_user(prog->aux->used_maps[i]->id,
|
&user_map_ids[i])) {
|
mutex_unlock(&prog->aux->used_maps_mutex);
|
return -EFAULT;
|
}
|
}
|
mutex_unlock(&prog->aux->used_maps_mutex);
|
|
err = set_info_rec_size(&info);
|
if (err)
|
return err;
|
|
bpf_prog_get_stats(prog, &stats);
|
info.run_time_ns = stats.nsecs;
|
info.run_cnt = stats.cnt;
|
|
if (!bpf_capable()) {
|
info.jited_prog_len = 0;
|
info.xlated_prog_len = 0;
|
info.nr_jited_ksyms = 0;
|
info.nr_jited_func_lens = 0;
|
info.nr_func_info = 0;
|
info.nr_line_info = 0;
|
info.nr_jited_line_info = 0;
|
goto done;
|
}
|
|
ulen = info.xlated_prog_len;
|
info.xlated_prog_len = bpf_prog_insn_size(prog);
|
if (info.xlated_prog_len && ulen) {
|
struct bpf_insn *insns_sanitized;
|
bool fault;
|
|
if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
|
info.xlated_prog_insns = 0;
|
goto done;
|
}
|
insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
|
if (!insns_sanitized)
|
return -ENOMEM;
|
uinsns = u64_to_user_ptr(info.xlated_prog_insns);
|
ulen = min_t(u32, info.xlated_prog_len, ulen);
|
fault = copy_to_user(uinsns, insns_sanitized, ulen);
|
kfree(insns_sanitized);
|
if (fault)
|
return -EFAULT;
|
}
|
|
if (bpf_prog_is_dev_bound(prog->aux)) {
|
err = bpf_prog_offload_info_fill(&info, prog);
|
if (err)
|
return err;
|
goto done;
|
}
|
|
/* NOTE: the following code is supposed to be skipped for offload.
|
* bpf_prog_offload_info_fill() is the place to fill similar fields
|
* for offload.
|
*/
|
ulen = info.jited_prog_len;
|
if (prog->aux->func_cnt) {
|
u32 i;
|
|
info.jited_prog_len = 0;
|
for (i = 0; i < prog->aux->func_cnt; i++)
|
info.jited_prog_len += prog->aux->func[i]->jited_len;
|
} else {
|
info.jited_prog_len = prog->jited_len;
|
}
|
|
if (info.jited_prog_len && ulen) {
|
if (bpf_dump_raw_ok(file->f_cred)) {
|
uinsns = u64_to_user_ptr(info.jited_prog_insns);
|
ulen = min_t(u32, info.jited_prog_len, ulen);
|
|
/* for multi-function programs, copy the JITed
|
* instructions for all the functions
|
*/
|
if (prog->aux->func_cnt) {
|
u32 len, free, i;
|
u8 *img;
|
|
free = ulen;
|
for (i = 0; i < prog->aux->func_cnt; i++) {
|
len = prog->aux->func[i]->jited_len;
|
len = min_t(u32, len, free);
|
img = (u8 *) prog->aux->func[i]->bpf_func;
|
if (copy_to_user(uinsns, img, len))
|
return -EFAULT;
|
uinsns += len;
|
free -= len;
|
if (!free)
|
break;
|
}
|
} else {
|
if (copy_to_user(uinsns, prog->bpf_func, ulen))
|
return -EFAULT;
|
}
|
} else {
|
info.jited_prog_insns = 0;
|
}
|
}
|
|
ulen = info.nr_jited_ksyms;
|
info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
|
if (ulen) {
|
if (bpf_dump_raw_ok(file->f_cred)) {
|
unsigned long ksym_addr;
|
u64 __user *user_ksyms;
|
u32 i;
|
|
/* copy the address of the kernel symbol
|
* corresponding to each function
|
*/
|
ulen = min_t(u32, info.nr_jited_ksyms, ulen);
|
user_ksyms = u64_to_user_ptr(info.jited_ksyms);
|
if (prog->aux->func_cnt) {
|
for (i = 0; i < ulen; i++) {
|
ksym_addr = (unsigned long)
|
prog->aux->func[i]->bpf_func;
|
if (put_user((u64) ksym_addr,
|
&user_ksyms[i]))
|
return -EFAULT;
|
}
|
} else {
|
ksym_addr = (unsigned long) prog->bpf_func;
|
if (put_user((u64) ksym_addr, &user_ksyms[0]))
|
return -EFAULT;
|
}
|
} else {
|
info.jited_ksyms = 0;
|
}
|
}
|
|
ulen = info.nr_jited_func_lens;
|
info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
|
if (ulen) {
|
if (bpf_dump_raw_ok(file->f_cred)) {
|
u32 __user *user_lens;
|
u32 func_len, i;
|
|
/* copy the JITed image lengths for each function */
|
ulen = min_t(u32, info.nr_jited_func_lens, ulen);
|
user_lens = u64_to_user_ptr(info.jited_func_lens);
|
if (prog->aux->func_cnt) {
|
for (i = 0; i < ulen; i++) {
|
func_len =
|
prog->aux->func[i]->jited_len;
|
if (put_user(func_len, &user_lens[i]))
|
return -EFAULT;
|
}
|
} else {
|
func_len = prog->jited_len;
|
if (put_user(func_len, &user_lens[0]))
|
return -EFAULT;
|
}
|
} else {
|
info.jited_func_lens = 0;
|
}
|
}
|
|
if (prog->aux->btf)
|
info.btf_id = btf_id(prog->aux->btf);
|
|
ulen = info.nr_func_info;
|
info.nr_func_info = prog->aux->func_info_cnt;
|
if (info.nr_func_info && ulen) {
|
char __user *user_finfo;
|
|
user_finfo = u64_to_user_ptr(info.func_info);
|
ulen = min_t(u32, info.nr_func_info, ulen);
|
if (copy_to_user(user_finfo, prog->aux->func_info,
|
info.func_info_rec_size * ulen))
|
return -EFAULT;
|
}
|
|
ulen = info.nr_line_info;
|
info.nr_line_info = prog->aux->nr_linfo;
|
if (info.nr_line_info && ulen) {
|
__u8 __user *user_linfo;
|
|
user_linfo = u64_to_user_ptr(info.line_info);
|
ulen = min_t(u32, info.nr_line_info, ulen);
|
if (copy_to_user(user_linfo, prog->aux->linfo,
|
info.line_info_rec_size * ulen))
|
return -EFAULT;
|
}
|
|
ulen = info.nr_jited_line_info;
|
if (prog->aux->jited_linfo)
|
info.nr_jited_line_info = prog->aux->nr_linfo;
|
else
|
info.nr_jited_line_info = 0;
|
if (info.nr_jited_line_info && ulen) {
|
if (bpf_dump_raw_ok(file->f_cred)) {
|
__u64 __user *user_linfo;
|
u32 i;
|
|
user_linfo = u64_to_user_ptr(info.jited_line_info);
|
ulen = min_t(u32, info.nr_jited_line_info, ulen);
|
for (i = 0; i < ulen; i++) {
|
if (put_user((__u64)(long)prog->aux->jited_linfo[i],
|
&user_linfo[i]))
|
return -EFAULT;
|
}
|
} else {
|
info.jited_line_info = 0;
|
}
|
}
|
|
ulen = info.nr_prog_tags;
|
info.nr_prog_tags = prog->aux->func_cnt ? : 1;
|
if (ulen) {
|
__u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
|
u32 i;
|
|
user_prog_tags = u64_to_user_ptr(info.prog_tags);
|
ulen = min_t(u32, info.nr_prog_tags, ulen);
|
if (prog->aux->func_cnt) {
|
for (i = 0; i < ulen; i++) {
|
if (copy_to_user(user_prog_tags[i],
|
prog->aux->func[i]->tag,
|
BPF_TAG_SIZE))
|
return -EFAULT;
|
}
|
} else {
|
if (copy_to_user(user_prog_tags[0],
|
prog->tag, BPF_TAG_SIZE))
|
return -EFAULT;
|
}
|
}
|
|
done:
|
if (copy_to_user(uinfo, &info, info_len) ||
|
put_user(info_len, &uattr->info.info_len))
|
return -EFAULT;
|
|
return 0;
|
}
|
|
static int bpf_map_get_info_by_fd(struct file *file,
|
struct bpf_map *map,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
|
struct bpf_map_info info;
|
u32 info_len = attr->info.info_len;
|
int err;
|
|
err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
|
if (err)
|
return err;
|
info_len = min_t(u32, sizeof(info), info_len);
|
|
memset(&info, 0, sizeof(info));
|
info.type = map->map_type;
|
info.id = map->id;
|
info.key_size = map->key_size;
|
info.value_size = map->value_size;
|
info.max_entries = map->max_entries;
|
info.map_flags = map->map_flags;
|
memcpy(info.name, map->name, sizeof(map->name));
|
|
if (map->btf) {
|
info.btf_id = btf_id(map->btf);
|
info.btf_key_type_id = map->btf_key_type_id;
|
info.btf_value_type_id = map->btf_value_type_id;
|
}
|
info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
|
|
if (bpf_map_is_dev_bound(map)) {
|
err = bpf_map_offload_info_fill(&info, map);
|
if (err)
|
return err;
|
}
|
|
if (copy_to_user(uinfo, &info, info_len) ||
|
put_user(info_len, &uattr->info.info_len))
|
return -EFAULT;
|
|
return 0;
|
}
|
|
static int bpf_btf_get_info_by_fd(struct file *file,
|
struct btf *btf,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
|
u32 info_len = attr->info.info_len;
|
int err;
|
|
err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
|
if (err)
|
return err;
|
|
return btf_get_info_by_fd(btf, attr, uattr);
|
}
|
|
static int bpf_link_get_info_by_fd(struct file *file,
|
struct bpf_link *link,
|
const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
struct bpf_link_info __user *uinfo = u64_to_user_ptr(attr->info.info);
|
struct bpf_link_info info;
|
u32 info_len = attr->info.info_len;
|
int err;
|
|
err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
|
if (err)
|
return err;
|
info_len = min_t(u32, sizeof(info), info_len);
|
|
memset(&info, 0, sizeof(info));
|
if (copy_from_user(&info, uinfo, info_len))
|
return -EFAULT;
|
|
info.type = link->type;
|
info.id = link->id;
|
info.prog_id = link->prog->aux->id;
|
|
if (link->ops->fill_link_info) {
|
err = link->ops->fill_link_info(link, &info);
|
if (err)
|
return err;
|
}
|
|
if (copy_to_user(uinfo, &info, info_len) ||
|
put_user(info_len, &uattr->info.info_len))
|
return -EFAULT;
|
|
return 0;
|
}
|
|
|
#define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
|
|
static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
int ufd = attr->info.bpf_fd;
|
struct fd f;
|
int err;
|
|
if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
|
return -EINVAL;
|
|
f = fdget(ufd);
|
if (!f.file)
|
return -EBADFD;
|
|
if (f.file->f_op == &bpf_prog_fops)
|
err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
|
uattr);
|
else if (f.file->f_op == &bpf_map_fops)
|
err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
|
uattr);
|
else if (f.file->f_op == &btf_fops)
|
err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
|
else if (f.file->f_op == &bpf_link_fops)
|
err = bpf_link_get_info_by_fd(f.file, f.file->private_data,
|
attr, uattr);
|
else
|
err = -EINVAL;
|
|
fdput(f);
|
return err;
|
}
|
|
#define BPF_BTF_LOAD_LAST_FIELD btf_log_level
|
|
static int bpf_btf_load(const union bpf_attr *attr)
|
{
|
if (CHECK_ATTR(BPF_BTF_LOAD))
|
return -EINVAL;
|
|
if (!bpf_capable())
|
return -EPERM;
|
|
return btf_new_fd(attr);
|
}
|
|
#define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
|
|
static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
|
{
|
if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
return btf_get_fd_by_id(attr->btf_id);
|
}
|
|
static int bpf_task_fd_query_copy(const union bpf_attr *attr,
|
union bpf_attr __user *uattr,
|
u32 prog_id, u32 fd_type,
|
const char *buf, u64 probe_offset,
|
u64 probe_addr)
|
{
|
char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
|
u32 len = buf ? strlen(buf) : 0, input_len;
|
int err = 0;
|
|
if (put_user(len, &uattr->task_fd_query.buf_len))
|
return -EFAULT;
|
input_len = attr->task_fd_query.buf_len;
|
if (input_len && ubuf) {
|
if (!len) {
|
/* nothing to copy, just make ubuf NULL terminated */
|
char zero = '\0';
|
|
if (put_user(zero, ubuf))
|
return -EFAULT;
|
} else if (input_len >= len + 1) {
|
/* ubuf can hold the string with NULL terminator */
|
if (copy_to_user(ubuf, buf, len + 1))
|
return -EFAULT;
|
} else {
|
/* ubuf cannot hold the string with NULL terminator,
|
* do a partial copy with NULL terminator.
|
*/
|
char zero = '\0';
|
|
err = -ENOSPC;
|
if (copy_to_user(ubuf, buf, input_len - 1))
|
return -EFAULT;
|
if (put_user(zero, ubuf + input_len - 1))
|
return -EFAULT;
|
}
|
}
|
|
if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
|
put_user(fd_type, &uattr->task_fd_query.fd_type) ||
|
put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
|
put_user(probe_addr, &uattr->task_fd_query.probe_addr))
|
return -EFAULT;
|
|
return err;
|
}
|
|
#define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
|
|
static int bpf_task_fd_query(const union bpf_attr *attr,
|
union bpf_attr __user *uattr)
|
{
|
pid_t pid = attr->task_fd_query.pid;
|
u32 fd = attr->task_fd_query.fd;
|
const struct perf_event *event;
|
struct files_struct *files;
|
struct task_struct *task;
|
struct file *file;
|
int err;
|
|
if (CHECK_ATTR(BPF_TASK_FD_QUERY))
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
if (attr->task_fd_query.flags != 0)
|
return -EINVAL;
|
|
rcu_read_lock();
|
task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
|
rcu_read_unlock();
|
if (!task)
|
return -ENOENT;
|
|
files = get_files_struct(task);
|
put_task_struct(task);
|
if (!files)
|
return -ENOENT;
|
|
err = 0;
|
spin_lock(&files->file_lock);
|
file = fcheck_files(files, fd);
|
if (!file)
|
err = -EBADF;
|
else
|
get_file(file);
|
spin_unlock(&files->file_lock);
|
put_files_struct(files);
|
|
if (err)
|
goto out;
|
|
if (file->f_op == &bpf_link_fops) {
|
struct bpf_link *link = file->private_data;
|
|
if (link->ops == &bpf_raw_tp_link_lops) {
|
struct bpf_raw_tp_link *raw_tp =
|
container_of(link, struct bpf_raw_tp_link, link);
|
struct bpf_raw_event_map *btp = raw_tp->btp;
|
|
err = bpf_task_fd_query_copy(attr, uattr,
|
raw_tp->link.prog->aux->id,
|
BPF_FD_TYPE_RAW_TRACEPOINT,
|
btp->tp->name, 0, 0);
|
goto put_file;
|
}
|
goto out_not_supp;
|
}
|
|
event = perf_get_event(file);
|
if (!IS_ERR(event)) {
|
u64 probe_offset, probe_addr;
|
u32 prog_id, fd_type;
|
const char *buf;
|
|
err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
|
&buf, &probe_offset,
|
&probe_addr);
|
if (!err)
|
err = bpf_task_fd_query_copy(attr, uattr, prog_id,
|
fd_type, buf,
|
probe_offset,
|
probe_addr);
|
goto put_file;
|
}
|
|
out_not_supp:
|
err = -ENOTSUPP;
|
put_file:
|
fput(file);
|
out:
|
return err;
|
}
|
|
#define BPF_MAP_BATCH_LAST_FIELD batch.flags
|
|
#define BPF_DO_BATCH(fn) \
|
do { \
|
if (!fn) { \
|
err = -ENOTSUPP; \
|
goto err_put; \
|
} \
|
err = fn(map, attr, uattr); \
|
} while (0)
|
|
static int bpf_map_do_batch(const union bpf_attr *attr,
|
union bpf_attr __user *uattr,
|
int cmd)
|
{
|
bool has_read = cmd == BPF_MAP_LOOKUP_BATCH ||
|
cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH;
|
bool has_write = cmd != BPF_MAP_LOOKUP_BATCH;
|
struct bpf_map *map;
|
int err, ufd;
|
struct fd f;
|
|
if (CHECK_ATTR(BPF_MAP_BATCH))
|
return -EINVAL;
|
|
ufd = attr->batch.map_fd;
|
f = fdget(ufd);
|
map = __bpf_map_get(f);
|
if (IS_ERR(map))
|
return PTR_ERR(map);
|
if (has_write)
|
bpf_map_write_active_inc(map);
|
if (has_read && !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
if (has_write && !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
|
err = -EPERM;
|
goto err_put;
|
}
|
|
if (cmd == BPF_MAP_LOOKUP_BATCH)
|
BPF_DO_BATCH(map->ops->map_lookup_batch);
|
else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH)
|
BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch);
|
else if (cmd == BPF_MAP_UPDATE_BATCH)
|
BPF_DO_BATCH(map->ops->map_update_batch);
|
else
|
BPF_DO_BATCH(map->ops->map_delete_batch);
|
err_put:
|
if (has_write)
|
bpf_map_write_active_dec(map);
|
fdput(f);
|
return err;
|
}
|
|
static int tracing_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
|
{
|
if (attr->link_create.attach_type != prog->expected_attach_type)
|
return -EINVAL;
|
|
if (prog->expected_attach_type == BPF_TRACE_ITER)
|
return bpf_iter_link_attach(attr, prog);
|
else if (prog->type == BPF_PROG_TYPE_EXT)
|
return bpf_tracing_prog_attach(prog,
|
attr->link_create.target_fd,
|
attr->link_create.target_btf_id);
|
return -EINVAL;
|
}
|
|
#define BPF_LINK_CREATE_LAST_FIELD link_create.iter_info_len
|
static int link_create(union bpf_attr *attr)
|
{
|
enum bpf_prog_type ptype;
|
struct bpf_prog *prog;
|
int ret;
|
|
if (CHECK_ATTR(BPF_LINK_CREATE))
|
return -EINVAL;
|
|
prog = bpf_prog_get(attr->link_create.prog_fd);
|
if (IS_ERR(prog))
|
return PTR_ERR(prog);
|
|
ret = bpf_prog_attach_check_attach_type(prog,
|
attr->link_create.attach_type);
|
if (ret)
|
goto out;
|
|
if (prog->type == BPF_PROG_TYPE_EXT) {
|
ret = tracing_bpf_link_attach(attr, prog);
|
goto out;
|
}
|
|
ptype = attach_type_to_prog_type(attr->link_create.attach_type);
|
if (ptype == BPF_PROG_TYPE_UNSPEC || ptype != prog->type) {
|
ret = -EINVAL;
|
goto out;
|
}
|
|
switch (ptype) {
|
case BPF_PROG_TYPE_CGROUP_SKB:
|
case BPF_PROG_TYPE_CGROUP_SOCK:
|
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
|
case BPF_PROG_TYPE_SOCK_OPS:
|
case BPF_PROG_TYPE_CGROUP_DEVICE:
|
case BPF_PROG_TYPE_CGROUP_SYSCTL:
|
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
|
ret = cgroup_bpf_link_attach(attr, prog);
|
break;
|
case BPF_PROG_TYPE_TRACING:
|
ret = tracing_bpf_link_attach(attr, prog);
|
break;
|
case BPF_PROG_TYPE_FLOW_DISSECTOR:
|
case BPF_PROG_TYPE_SK_LOOKUP:
|
ret = netns_bpf_link_create(attr, prog);
|
break;
|
#ifdef CONFIG_NET
|
case BPF_PROG_TYPE_XDP:
|
ret = bpf_xdp_link_attach(attr, prog);
|
break;
|
#endif
|
default:
|
ret = -EINVAL;
|
}
|
|
out:
|
if (ret < 0)
|
bpf_prog_put(prog);
|
return ret;
|
}
|
|
#define BPF_LINK_UPDATE_LAST_FIELD link_update.old_prog_fd
|
|
static int link_update(union bpf_attr *attr)
|
{
|
struct bpf_prog *old_prog = NULL, *new_prog;
|
struct bpf_link *link;
|
u32 flags;
|
int ret;
|
|
if (CHECK_ATTR(BPF_LINK_UPDATE))
|
return -EINVAL;
|
|
flags = attr->link_update.flags;
|
if (flags & ~BPF_F_REPLACE)
|
return -EINVAL;
|
|
link = bpf_link_get_from_fd(attr->link_update.link_fd);
|
if (IS_ERR(link))
|
return PTR_ERR(link);
|
|
new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
|
if (IS_ERR(new_prog)) {
|
ret = PTR_ERR(new_prog);
|
goto out_put_link;
|
}
|
|
if (flags & BPF_F_REPLACE) {
|
old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
|
if (IS_ERR(old_prog)) {
|
ret = PTR_ERR(old_prog);
|
old_prog = NULL;
|
goto out_put_progs;
|
}
|
} else if (attr->link_update.old_prog_fd) {
|
ret = -EINVAL;
|
goto out_put_progs;
|
}
|
|
if (link->ops->update_prog)
|
ret = link->ops->update_prog(link, new_prog, old_prog);
|
else
|
ret = -EINVAL;
|
|
out_put_progs:
|
if (old_prog)
|
bpf_prog_put(old_prog);
|
if (ret)
|
bpf_prog_put(new_prog);
|
out_put_link:
|
bpf_link_put(link);
|
return ret;
|
}
|
|
#define BPF_LINK_DETACH_LAST_FIELD link_detach.link_fd
|
|
static int link_detach(union bpf_attr *attr)
|
{
|
struct bpf_link *link;
|
int ret;
|
|
if (CHECK_ATTR(BPF_LINK_DETACH))
|
return -EINVAL;
|
|
link = bpf_link_get_from_fd(attr->link_detach.link_fd);
|
if (IS_ERR(link))
|
return PTR_ERR(link);
|
|
if (link->ops->detach)
|
ret = link->ops->detach(link);
|
else
|
ret = -EOPNOTSUPP;
|
|
bpf_link_put(link);
|
return ret;
|
}
|
|
static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
|
{
|
return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
|
}
|
|
struct bpf_link *bpf_link_by_id(u32 id)
|
{
|
struct bpf_link *link;
|
|
if (!id)
|
return ERR_PTR(-ENOENT);
|
|
spin_lock_bh(&link_idr_lock);
|
/* before link is "settled", ID is 0, pretend it doesn't exist yet */
|
link = idr_find(&link_idr, id);
|
if (link) {
|
if (link->id)
|
link = bpf_link_inc_not_zero(link);
|
else
|
link = ERR_PTR(-EAGAIN);
|
} else {
|
link = ERR_PTR(-ENOENT);
|
}
|
spin_unlock_bh(&link_idr_lock);
|
return link;
|
}
|
|
#define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
|
|
static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
|
{
|
struct bpf_link *link;
|
u32 id = attr->link_id;
|
int fd;
|
|
if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
link = bpf_link_by_id(id);
|
if (IS_ERR(link))
|
return PTR_ERR(link);
|
|
fd = bpf_link_new_fd(link);
|
if (fd < 0)
|
bpf_link_put(link);
|
|
return fd;
|
}
|
|
DEFINE_MUTEX(bpf_stats_enabled_mutex);
|
|
static int bpf_stats_release(struct inode *inode, struct file *file)
|
{
|
mutex_lock(&bpf_stats_enabled_mutex);
|
static_key_slow_dec(&bpf_stats_enabled_key.key);
|
mutex_unlock(&bpf_stats_enabled_mutex);
|
return 0;
|
}
|
|
static const struct file_operations bpf_stats_fops = {
|
.release = bpf_stats_release,
|
};
|
|
static int bpf_enable_runtime_stats(void)
|
{
|
int fd;
|
|
mutex_lock(&bpf_stats_enabled_mutex);
|
|
/* Set a very high limit to avoid overflow */
|
if (static_key_count(&bpf_stats_enabled_key.key) > INT_MAX / 2) {
|
mutex_unlock(&bpf_stats_enabled_mutex);
|
return -EBUSY;
|
}
|
|
fd = anon_inode_getfd("bpf-stats", &bpf_stats_fops, NULL, O_CLOEXEC);
|
if (fd >= 0)
|
static_key_slow_inc(&bpf_stats_enabled_key.key);
|
|
mutex_unlock(&bpf_stats_enabled_mutex);
|
return fd;
|
}
|
|
#define BPF_ENABLE_STATS_LAST_FIELD enable_stats.type
|
|
static int bpf_enable_stats(union bpf_attr *attr)
|
{
|
|
if (CHECK_ATTR(BPF_ENABLE_STATS))
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
return -EPERM;
|
|
switch (attr->enable_stats.type) {
|
case BPF_STATS_RUN_TIME:
|
return bpf_enable_runtime_stats();
|
default:
|
break;
|
}
|
return -EINVAL;
|
}
|
|
#define BPF_ITER_CREATE_LAST_FIELD iter_create.flags
|
|
static int bpf_iter_create(union bpf_attr *attr)
|
{
|
struct bpf_link *link;
|
int err;
|
|
if (CHECK_ATTR(BPF_ITER_CREATE))
|
return -EINVAL;
|
|
if (attr->iter_create.flags)
|
return -EINVAL;
|
|
link = bpf_link_get_from_fd(attr->iter_create.link_fd);
|
if (IS_ERR(link))
|
return PTR_ERR(link);
|
|
err = bpf_iter_new_fd(link);
|
bpf_link_put(link);
|
|
return err;
|
}
|
|
#define BPF_PROG_BIND_MAP_LAST_FIELD prog_bind_map.flags
|
|
static int bpf_prog_bind_map(union bpf_attr *attr)
|
{
|
struct bpf_prog *prog;
|
struct bpf_map *map;
|
struct bpf_map **used_maps_old, **used_maps_new;
|
int i, ret = 0;
|
|
if (CHECK_ATTR(BPF_PROG_BIND_MAP))
|
return -EINVAL;
|
|
if (attr->prog_bind_map.flags)
|
return -EINVAL;
|
|
prog = bpf_prog_get(attr->prog_bind_map.prog_fd);
|
if (IS_ERR(prog))
|
return PTR_ERR(prog);
|
|
map = bpf_map_get(attr->prog_bind_map.map_fd);
|
if (IS_ERR(map)) {
|
ret = PTR_ERR(map);
|
goto out_prog_put;
|
}
|
|
mutex_lock(&prog->aux->used_maps_mutex);
|
|
used_maps_old = prog->aux->used_maps;
|
|
for (i = 0; i < prog->aux->used_map_cnt; i++)
|
if (used_maps_old[i] == map) {
|
bpf_map_put(map);
|
goto out_unlock;
|
}
|
|
used_maps_new = kmalloc_array(prog->aux->used_map_cnt + 1,
|
sizeof(used_maps_new[0]),
|
GFP_KERNEL);
|
if (!used_maps_new) {
|
ret = -ENOMEM;
|
goto out_unlock;
|
}
|
|
memcpy(used_maps_new, used_maps_old,
|
sizeof(used_maps_old[0]) * prog->aux->used_map_cnt);
|
used_maps_new[prog->aux->used_map_cnt] = map;
|
|
prog->aux->used_map_cnt++;
|
prog->aux->used_maps = used_maps_new;
|
|
kfree(used_maps_old);
|
|
out_unlock:
|
mutex_unlock(&prog->aux->used_maps_mutex);
|
|
if (ret)
|
bpf_map_put(map);
|
out_prog_put:
|
bpf_prog_put(prog);
|
return ret;
|
}
|
|
SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
|
{
|
union bpf_attr attr;
|
int err;
|
|
if (sysctl_unprivileged_bpf_disabled && !bpf_capable())
|
return -EPERM;
|
|
err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
|
if (err)
|
return err;
|
size = min_t(u32, size, sizeof(attr));
|
|
/* copy attributes from user space, may be less than sizeof(bpf_attr) */
|
memset(&attr, 0, sizeof(attr));
|
if (copy_from_user(&attr, uattr, size) != 0)
|
return -EFAULT;
|
|
trace_android_vh_check_bpf_syscall(cmd, &attr, size);
|
|
err = security_bpf(cmd, &attr, size);
|
if (err < 0)
|
return err;
|
|
switch (cmd) {
|
case BPF_MAP_CREATE:
|
err = map_create(&attr);
|
break;
|
case BPF_MAP_LOOKUP_ELEM:
|
err = map_lookup_elem(&attr);
|
break;
|
case BPF_MAP_UPDATE_ELEM:
|
err = map_update_elem(&attr);
|
break;
|
case BPF_MAP_DELETE_ELEM:
|
err = map_delete_elem(&attr);
|
break;
|
case BPF_MAP_GET_NEXT_KEY:
|
err = map_get_next_key(&attr);
|
break;
|
case BPF_MAP_FREEZE:
|
err = map_freeze(&attr);
|
break;
|
case BPF_PROG_LOAD:
|
err = bpf_prog_load(&attr, uattr);
|
break;
|
case BPF_OBJ_PIN:
|
err = bpf_obj_pin(&attr);
|
break;
|
case BPF_OBJ_GET:
|
err = bpf_obj_get(&attr);
|
break;
|
case BPF_PROG_ATTACH:
|
err = bpf_prog_attach(&attr);
|
break;
|
case BPF_PROG_DETACH:
|
err = bpf_prog_detach(&attr);
|
break;
|
case BPF_PROG_QUERY:
|
err = bpf_prog_query(&attr, uattr);
|
break;
|
case BPF_PROG_TEST_RUN:
|
err = bpf_prog_test_run(&attr, uattr);
|
break;
|
case BPF_PROG_GET_NEXT_ID:
|
err = bpf_obj_get_next_id(&attr, uattr,
|
&prog_idr, &prog_idr_lock);
|
break;
|
case BPF_MAP_GET_NEXT_ID:
|
err = bpf_obj_get_next_id(&attr, uattr,
|
&map_idr, &map_idr_lock);
|
break;
|
case BPF_BTF_GET_NEXT_ID:
|
err = bpf_obj_get_next_id(&attr, uattr,
|
&btf_idr, &btf_idr_lock);
|
break;
|
case BPF_PROG_GET_FD_BY_ID:
|
err = bpf_prog_get_fd_by_id(&attr);
|
break;
|
case BPF_MAP_GET_FD_BY_ID:
|
err = bpf_map_get_fd_by_id(&attr);
|
break;
|
case BPF_OBJ_GET_INFO_BY_FD:
|
err = bpf_obj_get_info_by_fd(&attr, uattr);
|
break;
|
case BPF_RAW_TRACEPOINT_OPEN:
|
err = bpf_raw_tracepoint_open(&attr);
|
break;
|
case BPF_BTF_LOAD:
|
err = bpf_btf_load(&attr);
|
break;
|
case BPF_BTF_GET_FD_BY_ID:
|
err = bpf_btf_get_fd_by_id(&attr);
|
break;
|
case BPF_TASK_FD_QUERY:
|
err = bpf_task_fd_query(&attr, uattr);
|
break;
|
case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
|
err = map_lookup_and_delete_elem(&attr);
|
break;
|
case BPF_MAP_LOOKUP_BATCH:
|
err = bpf_map_do_batch(&attr, uattr, BPF_MAP_LOOKUP_BATCH);
|
break;
|
case BPF_MAP_LOOKUP_AND_DELETE_BATCH:
|
err = bpf_map_do_batch(&attr, uattr,
|
BPF_MAP_LOOKUP_AND_DELETE_BATCH);
|
break;
|
case BPF_MAP_UPDATE_BATCH:
|
err = bpf_map_do_batch(&attr, uattr, BPF_MAP_UPDATE_BATCH);
|
break;
|
case BPF_MAP_DELETE_BATCH:
|
err = bpf_map_do_batch(&attr, uattr, BPF_MAP_DELETE_BATCH);
|
break;
|
case BPF_LINK_CREATE:
|
err = link_create(&attr);
|
break;
|
case BPF_LINK_UPDATE:
|
err = link_update(&attr);
|
break;
|
case BPF_LINK_GET_FD_BY_ID:
|
err = bpf_link_get_fd_by_id(&attr);
|
break;
|
case BPF_LINK_GET_NEXT_ID:
|
err = bpf_obj_get_next_id(&attr, uattr,
|
&link_idr, &link_idr_lock);
|
break;
|
case BPF_ENABLE_STATS:
|
err = bpf_enable_stats(&attr);
|
break;
|
case BPF_ITER_CREATE:
|
err = bpf_iter_create(&attr);
|
break;
|
case BPF_LINK_DETACH:
|
err = link_detach(&attr);
|
break;
|
case BPF_PROG_BIND_MAP:
|
err = bpf_prog_bind_map(&attr);
|
break;
|
default:
|
err = -EINVAL;
|
break;
|
}
|
|
return err;
|
}
|
