mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 14:05:19 +08:00
587b80cce9
after introduction of bpf_xdp_adjust_tail helper packet length could be changed not only if xdp->data pointer has been changed but xdp->data_end as well. making bpf_prog_test_run aware of this possibility Signed-off-by: Nikita V. Shirokov <tehnerd@tehnerd.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/* Copyright (c) 2017 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/bpf.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/sched/signal.h>
|
|
|
|
static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx)
|
|
{
|
|
u32 ret;
|
|
|
|
preempt_disable();
|
|
rcu_read_lock();
|
|
ret = BPF_PROG_RUN(prog, ctx);
|
|
rcu_read_unlock();
|
|
preempt_enable();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
|
|
{
|
|
u64 time_start, time_spent = 0;
|
|
u32 ret = 0, i;
|
|
|
|
if (!repeat)
|
|
repeat = 1;
|
|
time_start = ktime_get_ns();
|
|
for (i = 0; i < repeat; i++) {
|
|
ret = bpf_test_run_one(prog, ctx);
|
|
if (need_resched()) {
|
|
if (signal_pending(current))
|
|
break;
|
|
time_spent += ktime_get_ns() - time_start;
|
|
cond_resched();
|
|
time_start = ktime_get_ns();
|
|
}
|
|
}
|
|
time_spent += ktime_get_ns() - time_start;
|
|
do_div(time_spent, repeat);
|
|
*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bpf_test_finish(const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr, const void *data,
|
|
u32 size, u32 retval, u32 duration)
|
|
{
|
|
void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
|
|
int err = -EFAULT;
|
|
|
|
if (data_out && copy_to_user(data_out, data, size))
|
|
goto out;
|
|
if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
|
|
goto out;
|
|
if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
|
|
goto out;
|
|
if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
|
|
goto out;
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
|
|
u32 headroom, u32 tailroom)
|
|
{
|
|
void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
|
|
void *data;
|
|
|
|
if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
data = kzalloc(size + headroom + tailroom, GFP_USER);
|
|
if (!data)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (copy_from_user(data + headroom, data_in, size)) {
|
|
kfree(data);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
return data;
|
|
}
|
|
|
|
int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
bool is_l2 = false, is_direct_pkt_access = false;
|
|
u32 size = kattr->test.data_size_in;
|
|
u32 repeat = kattr->test.repeat;
|
|
u32 retval, duration;
|
|
struct sk_buff *skb;
|
|
void *data;
|
|
int ret;
|
|
|
|
data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
|
|
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
switch (prog->type) {
|
|
case BPF_PROG_TYPE_SCHED_CLS:
|
|
case BPF_PROG_TYPE_SCHED_ACT:
|
|
is_l2 = true;
|
|
/* fall through */
|
|
case BPF_PROG_TYPE_LWT_IN:
|
|
case BPF_PROG_TYPE_LWT_OUT:
|
|
case BPF_PROG_TYPE_LWT_XMIT:
|
|
is_direct_pkt_access = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
skb = build_skb(data, 0);
|
|
if (!skb) {
|
|
kfree(data);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
|
|
__skb_put(skb, size);
|
|
skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
|
|
skb_reset_network_header(skb);
|
|
|
|
if (is_l2)
|
|
__skb_push(skb, ETH_HLEN);
|
|
if (is_direct_pkt_access)
|
|
bpf_compute_data_pointers(skb);
|
|
retval = bpf_test_run(prog, skb, repeat, &duration);
|
|
if (!is_l2)
|
|
__skb_push(skb, ETH_HLEN);
|
|
size = skb->len;
|
|
/* bpf program can never convert linear skb to non-linear */
|
|
if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
|
|
size = skb_headlen(skb);
|
|
ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
|
|
kfree_skb(skb);
|
|
return ret;
|
|
}
|
|
|
|
int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
u32 size = kattr->test.data_size_in;
|
|
u32 repeat = kattr->test.repeat;
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct xdp_buff xdp = {};
|
|
u32 retval, duration;
|
|
void *data;
|
|
int ret;
|
|
|
|
data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
xdp.data_hard_start = data;
|
|
xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN;
|
|
xdp.data_meta = xdp.data;
|
|
xdp.data_end = xdp.data + size;
|
|
|
|
rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
|
|
xdp.rxq = &rxqueue->xdp_rxq;
|
|
|
|
retval = bpf_test_run(prog, &xdp, repeat, &duration);
|
|
if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN ||
|
|
xdp.data_end != xdp.data + size)
|
|
size = xdp.data_end - xdp.data;
|
|
ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
|
|
kfree(data);
|
|
return ret;
|
|
}
|