498 строки
12 KiB
C
498 строки
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Facebook
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*/
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#include <linux/bpf.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/etherdevice.h>
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#include <linux/filter.h>
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#include <linux/sched/signal.h>
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#include <net/bpf_sk_storage.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/bpf_test_run.h>
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static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
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u32 *retval, u32 *time)
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{
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struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
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enum bpf_cgroup_storage_type stype;
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u64 time_start, time_spent = 0;
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int ret = 0;
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u32 i;
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for_each_cgroup_storage_type(stype) {
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storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
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if (IS_ERR(storage[stype])) {
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storage[stype] = NULL;
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(storage[stype]);
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return -ENOMEM;
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}
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}
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if (!repeat)
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repeat = 1;
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rcu_read_lock();
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preempt_disable();
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time_start = ktime_get_ns();
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for (i = 0; i < repeat; i++) {
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bpf_cgroup_storage_set(storage);
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*retval = BPF_PROG_RUN(prog, ctx);
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if (signal_pending(current)) {
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ret = -EINTR;
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break;
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}
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if (need_resched()) {
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time_spent += ktime_get_ns() - time_start;
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preempt_enable();
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rcu_read_unlock();
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cond_resched();
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rcu_read_lock();
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preempt_disable();
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time_start = ktime_get_ns();
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}
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}
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time_spent += ktime_get_ns() - time_start;
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preempt_enable();
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rcu_read_unlock();
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do_div(time_spent, repeat);
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*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(storage[stype]);
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return ret;
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}
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static int bpf_test_finish(const union bpf_attr *kattr,
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union bpf_attr __user *uattr, const void *data,
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u32 size, u32 retval, u32 duration)
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{
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void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
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int err = -EFAULT;
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u32 copy_size = size;
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/* Clamp copy if the user has provided a size hint, but copy the full
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* buffer if not to retain old behaviour.
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*/
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if (kattr->test.data_size_out &&
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copy_size > kattr->test.data_size_out) {
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copy_size = kattr->test.data_size_out;
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err = -ENOSPC;
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}
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if (data_out && copy_to_user(data_out, data, copy_size))
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goto out;
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if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
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goto out;
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if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
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goto out;
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if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
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goto out;
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if (err != -ENOSPC)
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err = 0;
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out:
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trace_bpf_test_finish(&err);
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return err;
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}
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static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
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u32 headroom, u32 tailroom)
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{
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void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
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void *data;
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if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
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return ERR_PTR(-EINVAL);
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data = kzalloc(size + headroom + tailroom, GFP_USER);
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if (!data)
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return ERR_PTR(-ENOMEM);
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if (copy_from_user(data + headroom, data_in, size)) {
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kfree(data);
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return ERR_PTR(-EFAULT);
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}
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return data;
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}
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static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
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{
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void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
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void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
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u32 size = kattr->test.ctx_size_in;
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void *data;
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int err;
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if (!data_in && !data_out)
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return NULL;
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data = kzalloc(max_size, GFP_USER);
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if (!data)
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return ERR_PTR(-ENOMEM);
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if (data_in) {
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err = bpf_check_uarg_tail_zero(data_in, max_size, size);
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if (err) {
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kfree(data);
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return ERR_PTR(err);
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}
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size = min_t(u32, max_size, size);
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if (copy_from_user(data, data_in, size)) {
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kfree(data);
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return ERR_PTR(-EFAULT);
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}
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}
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return data;
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}
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static int bpf_ctx_finish(const union bpf_attr *kattr,
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union bpf_attr __user *uattr, const void *data,
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u32 size)
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{
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void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
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int err = -EFAULT;
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u32 copy_size = size;
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if (!data || !data_out)
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return 0;
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if (copy_size > kattr->test.ctx_size_out) {
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copy_size = kattr->test.ctx_size_out;
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err = -ENOSPC;
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}
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if (copy_to_user(data_out, data, copy_size))
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goto out;
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if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
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goto out;
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if (err != -ENOSPC)
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err = 0;
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out:
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return err;
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}
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/**
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* range_is_zero - test whether buffer is initialized
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* @buf: buffer to check
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* @from: check from this position
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* @to: check up until (excluding) this position
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*
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* This function returns true if the there is a non-zero byte
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* in the buf in the range [from,to).
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*/
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static inline bool range_is_zero(void *buf, size_t from, size_t to)
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{
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return !memchr_inv((u8 *)buf + from, 0, to - from);
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}
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static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
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{
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struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
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if (!__skb)
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return 0;
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/* make sure the fields we don't use are zeroed */
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if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, priority)))
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return -EINVAL;
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/* priority is allowed */
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if (!range_is_zero(__skb, offsetof(struct __sk_buff, priority) +
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FIELD_SIZEOF(struct __sk_buff, priority),
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offsetof(struct __sk_buff, cb)))
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return -EINVAL;
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/* cb is allowed */
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if (!range_is_zero(__skb, offsetof(struct __sk_buff, cb) +
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FIELD_SIZEOF(struct __sk_buff, cb),
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offsetof(struct __sk_buff, tstamp)))
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return -EINVAL;
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/* tstamp is allowed */
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if (!range_is_zero(__skb, offsetof(struct __sk_buff, tstamp) +
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FIELD_SIZEOF(struct __sk_buff, tstamp),
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sizeof(struct __sk_buff)))
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return -EINVAL;
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skb->priority = __skb->priority;
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skb->tstamp = __skb->tstamp;
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memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
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return 0;
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}
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static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
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{
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struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
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if (!__skb)
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return;
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__skb->priority = skb->priority;
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__skb->tstamp = skb->tstamp;
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memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
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}
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int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
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union bpf_attr __user *uattr)
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{
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bool is_l2 = false, is_direct_pkt_access = false;
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u32 size = kattr->test.data_size_in;
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u32 repeat = kattr->test.repeat;
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struct __sk_buff *ctx = NULL;
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u32 retval, duration;
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int hh_len = ETH_HLEN;
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struct sk_buff *skb;
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struct sock *sk;
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void *data;
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int ret;
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data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
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SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
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if (IS_ERR(data))
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return PTR_ERR(data);
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ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
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if (IS_ERR(ctx)) {
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kfree(data);
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return PTR_ERR(ctx);
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}
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switch (prog->type) {
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case BPF_PROG_TYPE_SCHED_CLS:
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case BPF_PROG_TYPE_SCHED_ACT:
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is_l2 = true;
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/* fall through */
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case BPF_PROG_TYPE_LWT_IN:
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case BPF_PROG_TYPE_LWT_OUT:
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case BPF_PROG_TYPE_LWT_XMIT:
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is_direct_pkt_access = true;
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break;
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default:
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break;
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}
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sk = kzalloc(sizeof(struct sock), GFP_USER);
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if (!sk) {
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kfree(data);
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kfree(ctx);
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return -ENOMEM;
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}
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sock_net_set(sk, current->nsproxy->net_ns);
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sock_init_data(NULL, sk);
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skb = build_skb(data, 0);
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if (!skb) {
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kfree(data);
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kfree(ctx);
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kfree(sk);
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return -ENOMEM;
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}
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skb->sk = sk;
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skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
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__skb_put(skb, size);
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skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
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skb_reset_network_header(skb);
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if (is_l2)
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__skb_push(skb, hh_len);
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if (is_direct_pkt_access)
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bpf_compute_data_pointers(skb);
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ret = convert___skb_to_skb(skb, ctx);
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if (ret)
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goto out;
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ret = bpf_test_run(prog, skb, repeat, &retval, &duration);
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if (ret)
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goto out;
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if (!is_l2) {
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if (skb_headroom(skb) < hh_len) {
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int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
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if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
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ret = -ENOMEM;
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goto out;
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}
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}
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memset(__skb_push(skb, hh_len), 0, hh_len);
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}
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convert_skb_to___skb(skb, ctx);
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size = skb->len;
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/* bpf program can never convert linear skb to non-linear */
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if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
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size = skb_headlen(skb);
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ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
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if (!ret)
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ret = bpf_ctx_finish(kattr, uattr, ctx,
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sizeof(struct __sk_buff));
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out:
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kfree_skb(skb);
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bpf_sk_storage_free(sk);
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kfree(sk);
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kfree(ctx);
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return ret;
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}
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int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
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union bpf_attr __user *uattr)
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{
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u32 size = kattr->test.data_size_in;
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u32 repeat = kattr->test.repeat;
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struct netdev_rx_queue *rxqueue;
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struct xdp_buff xdp = {};
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u32 retval, duration;
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void *data;
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int ret;
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if (kattr->test.ctx_in || kattr->test.ctx_out)
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return -EINVAL;
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data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0);
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if (IS_ERR(data))
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return PTR_ERR(data);
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xdp.data_hard_start = data;
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xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN;
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xdp.data_meta = xdp.data;
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xdp.data_end = xdp.data + size;
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rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
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xdp.rxq = &rxqueue->xdp_rxq;
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ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration);
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if (ret)
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goto out;
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if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN ||
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xdp.data_end != xdp.data + size)
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size = xdp.data_end - xdp.data;
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ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
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out:
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kfree(data);
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return ret;
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}
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static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
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{
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/* make sure the fields we don't use are zeroed */
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if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
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return -EINVAL;
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/* flags is allowed */
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if (!range_is_zero(ctx, offsetof(struct bpf_flow_keys, flags) +
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FIELD_SIZEOF(struct bpf_flow_keys, flags),
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sizeof(struct bpf_flow_keys)))
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return -EINVAL;
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return 0;
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}
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int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
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const union bpf_attr *kattr,
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union bpf_attr __user *uattr)
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{
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u32 size = kattr->test.data_size_in;
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struct bpf_flow_dissector ctx = {};
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u32 repeat = kattr->test.repeat;
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struct bpf_flow_keys *user_ctx;
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struct bpf_flow_keys flow_keys;
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u64 time_start, time_spent = 0;
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const struct ethhdr *eth;
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unsigned int flags = 0;
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u32 retval, duration;
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void *data;
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int ret;
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u32 i;
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if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
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return -EINVAL;
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if (size < ETH_HLEN)
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return -EINVAL;
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data = bpf_test_init(kattr, size, 0, 0);
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if (IS_ERR(data))
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return PTR_ERR(data);
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eth = (struct ethhdr *)data;
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if (!repeat)
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repeat = 1;
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user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
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if (IS_ERR(user_ctx)) {
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kfree(data);
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return PTR_ERR(user_ctx);
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}
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if (user_ctx) {
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ret = verify_user_bpf_flow_keys(user_ctx);
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if (ret)
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goto out;
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flags = user_ctx->flags;
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}
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ctx.flow_keys = &flow_keys;
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ctx.data = data;
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ctx.data_end = (__u8 *)data + size;
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rcu_read_lock();
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preempt_disable();
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time_start = ktime_get_ns();
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for (i = 0; i < repeat; i++) {
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retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
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size, flags);
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if (signal_pending(current)) {
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preempt_enable();
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rcu_read_unlock();
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ret = -EINTR;
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goto out;
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}
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if (need_resched()) {
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time_spent += ktime_get_ns() - time_start;
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preempt_enable();
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rcu_read_unlock();
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cond_resched();
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rcu_read_lock();
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preempt_disable();
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time_start = ktime_get_ns();
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}
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}
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time_spent += ktime_get_ns() - time_start;
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preempt_enable();
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rcu_read_unlock();
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do_div(time_spent, repeat);
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duration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
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ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
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retval, duration);
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if (!ret)
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ret = bpf_ctx_finish(kattr, uattr, user_ctx,
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sizeof(struct bpf_flow_keys));
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out:
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kfree(user_ctx);
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kfree(data);
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return ret;
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}
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