1 /* Copyright (c) 2017 Facebook
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
8 #include <linux/slab.h>
9 #include <linux/vmalloc.h>
10 #include <linux/etherdevice.h>
11 #include <linux/filter.h>
12 #include <linux/sched/signal.h>
14 static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx)
20 ret = BPF_PROG_RUN(prog, ctx);
27 static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
29 u64 time_start, time_spent = 0;
34 time_start = ktime_get_ns();
35 for (i = 0; i < repeat; i++) {
36 ret = bpf_test_run_one(prog, ctx);
38 if (signal_pending(current))
40 time_spent += ktime_get_ns() - time_start;
42 time_start = ktime_get_ns();
45 time_spent += ktime_get_ns() - time_start;
46 do_div(time_spent, repeat);
47 *time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
52 static int bpf_test_finish(const union bpf_attr *kattr,
53 union bpf_attr __user *uattr, const void *data,
54 u32 size, u32 retval, u32 duration)
56 void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
59 if (data_out && copy_to_user(data_out, data, size))
61 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
63 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
65 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
72 static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
73 u32 headroom, u32 tailroom)
75 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
78 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
79 return ERR_PTR(-EINVAL);
81 data = kzalloc(size + headroom + tailroom, GFP_USER);
83 return ERR_PTR(-ENOMEM);
85 if (copy_from_user(data + headroom, data_in, size)) {
87 return ERR_PTR(-EFAULT);
92 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
93 union bpf_attr __user *uattr)
95 bool is_l2 = false, is_direct_pkt_access = false;
96 u32 size = kattr->test.data_size_in;
97 u32 repeat = kattr->test.repeat;
99 int hh_len = ETH_HLEN;
104 data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
105 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
107 return PTR_ERR(data);
109 switch (prog->type) {
110 case BPF_PROG_TYPE_SCHED_CLS:
111 case BPF_PROG_TYPE_SCHED_ACT:
114 case BPF_PROG_TYPE_LWT_IN:
115 case BPF_PROG_TYPE_LWT_OUT:
116 case BPF_PROG_TYPE_LWT_XMIT:
117 is_direct_pkt_access = true;
123 skb = build_skb(data, 0);
129 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
130 __skb_put(skb, size);
131 skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
132 skb_reset_network_header(skb);
135 __skb_push(skb, hh_len);
136 if (is_direct_pkt_access)
137 bpf_compute_data_pointers(skb);
138 retval = bpf_test_run(prog, skb, repeat, &duration);
140 if (skb_headroom(skb) < hh_len) {
141 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
143 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
148 memset(__skb_push(skb, hh_len), 0, hh_len);
152 /* bpf program can never convert linear skb to non-linear */
153 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
154 size = skb_headlen(skb);
155 ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
160 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
161 union bpf_attr __user *uattr)
163 u32 size = kattr->test.data_size_in;
164 u32 repeat = kattr->test.repeat;
165 struct netdev_rx_queue *rxqueue;
166 struct xdp_buff xdp = {};
167 u32 retval, duration;
171 data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0);
173 return PTR_ERR(data);
175 xdp.data_hard_start = data;
176 xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN;
177 xdp.data_meta = xdp.data;
178 xdp.data_end = xdp.data + size;
180 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
181 xdp.rxq = &rxqueue->xdp_rxq;
183 retval = bpf_test_run(prog, &xdp, repeat, &duration);
184 if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN ||
185 xdp.data_end != xdp.data + size)
186 size = xdp.data_end - xdp.data;
187 ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);