1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2017 Facebook
5 #include <linux/slab.h>
6 #include <linux/vmalloc.h>
7 #include <linux/etherdevice.h>
8 #include <linux/filter.h>
9 #include <linux/sched/signal.h>
10 #include <net/bpf_sk_storage.h>
14 #define CREATE_TRACE_POINTS
15 #include <trace/events/bpf_test_run.h>
17 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
18 u32 *retval, u32 *time)
20 struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
21 enum bpf_cgroup_storage_type stype;
22 u64 time_start, time_spent = 0;
26 for_each_cgroup_storage_type(stype) {
27 storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
28 if (IS_ERR(storage[stype])) {
29 storage[stype] = NULL;
30 for_each_cgroup_storage_type(stype)
31 bpf_cgroup_storage_free(storage[stype]);
41 time_start = ktime_get_ns();
42 for (i = 0; i < repeat; i++) {
43 bpf_cgroup_storage_set(storage);
44 *retval = BPF_PROG_RUN(prog, ctx);
46 if (signal_pending(current)) {
52 time_spent += ktime_get_ns() - time_start;
60 time_start = ktime_get_ns();
63 time_spent += ktime_get_ns() - time_start;
67 do_div(time_spent, repeat);
68 *time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
70 for_each_cgroup_storage_type(stype)
71 bpf_cgroup_storage_free(storage[stype]);
76 static int bpf_test_finish(const union bpf_attr *kattr,
77 union bpf_attr __user *uattr, const void *data,
78 u32 size, u32 retval, u32 duration)
80 void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
84 /* Clamp copy if the user has provided a size hint, but copy the full
85 * buffer if not to retain old behaviour.
87 if (kattr->test.data_size_out &&
88 copy_size > kattr->test.data_size_out) {
89 copy_size = kattr->test.data_size_out;
93 if (data_out && copy_to_user(data_out, data, copy_size))
95 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
97 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
99 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
104 trace_bpf_test_finish(&err);
108 /* Integer types of various sizes and pointer combinations cover variety of
109 * architecture dependent calling conventions. 7+ can be supported in the
112 int noinline bpf_fentry_test1(int a)
117 int noinline bpf_fentry_test2(int a, u64 b)
122 int noinline bpf_fentry_test3(char a, int b, u64 c)
127 int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
129 return (long)a + b + c + d;
132 int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
134 return a + (long)b + c + d + e;
137 int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
139 return a + (long)b + c + d + (long)e + f;
142 static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
143 u32 headroom, u32 tailroom)
145 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
148 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
149 return ERR_PTR(-EINVAL);
151 data = kzalloc(size + headroom + tailroom, GFP_USER);
153 return ERR_PTR(-ENOMEM);
155 if (copy_from_user(data + headroom, data_in, size)) {
157 return ERR_PTR(-EFAULT);
159 if (bpf_fentry_test1(1) != 2 ||
160 bpf_fentry_test2(2, 3) != 5 ||
161 bpf_fentry_test3(4, 5, 6) != 15 ||
162 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
163 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
164 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111)
165 return ERR_PTR(-EFAULT);
169 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
171 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
172 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
173 u32 size = kattr->test.ctx_size_in;
177 if (!data_in && !data_out)
180 data = kzalloc(max_size, GFP_USER);
182 return ERR_PTR(-ENOMEM);
185 err = bpf_check_uarg_tail_zero(data_in, max_size, size);
191 size = min_t(u32, max_size, size);
192 if (copy_from_user(data, data_in, size)) {
194 return ERR_PTR(-EFAULT);
200 static int bpf_ctx_finish(const union bpf_attr *kattr,
201 union bpf_attr __user *uattr, const void *data,
204 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
206 u32 copy_size = size;
208 if (!data || !data_out)
211 if (copy_size > kattr->test.ctx_size_out) {
212 copy_size = kattr->test.ctx_size_out;
216 if (copy_to_user(data_out, data, copy_size))
218 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
227 * range_is_zero - test whether buffer is initialized
228 * @buf: buffer to check
229 * @from: check from this position
230 * @to: check up until (excluding) this position
232 * This function returns true if the there is a non-zero byte
233 * in the buf in the range [from,to).
235 static inline bool range_is_zero(void *buf, size_t from, size_t to)
237 return !memchr_inv((u8 *)buf + from, 0, to - from);
240 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
242 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
247 /* make sure the fields we don't use are zeroed */
248 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, priority)))
251 /* priority is allowed */
253 if (!range_is_zero(__skb, offsetof(struct __sk_buff, priority) +
254 FIELD_SIZEOF(struct __sk_buff, priority),
255 offsetof(struct __sk_buff, cb)))
260 if (!range_is_zero(__skb, offsetof(struct __sk_buff, cb) +
261 FIELD_SIZEOF(struct __sk_buff, cb),
262 offsetof(struct __sk_buff, tstamp)))
265 /* tstamp is allowed */
267 if (!range_is_zero(__skb, offsetof(struct __sk_buff, tstamp) +
268 FIELD_SIZEOF(struct __sk_buff, tstamp),
269 sizeof(struct __sk_buff)))
272 skb->priority = __skb->priority;
273 skb->tstamp = __skb->tstamp;
274 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
279 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
281 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
286 __skb->priority = skb->priority;
287 __skb->tstamp = skb->tstamp;
288 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
291 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
292 union bpf_attr __user *uattr)
294 bool is_l2 = false, is_direct_pkt_access = false;
295 u32 size = kattr->test.data_size_in;
296 u32 repeat = kattr->test.repeat;
297 struct __sk_buff *ctx = NULL;
298 u32 retval, duration;
299 int hh_len = ETH_HLEN;
305 data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
306 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
308 return PTR_ERR(data);
310 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
316 switch (prog->type) {
317 case BPF_PROG_TYPE_SCHED_CLS:
318 case BPF_PROG_TYPE_SCHED_ACT:
321 case BPF_PROG_TYPE_LWT_IN:
322 case BPF_PROG_TYPE_LWT_OUT:
323 case BPF_PROG_TYPE_LWT_XMIT:
324 is_direct_pkt_access = true;
330 sk = kzalloc(sizeof(struct sock), GFP_USER);
336 sock_net_set(sk, current->nsproxy->net_ns);
337 sock_init_data(NULL, sk);
339 skb = build_skb(data, 0);
348 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
349 __skb_put(skb, size);
350 skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
351 skb_reset_network_header(skb);
354 __skb_push(skb, hh_len);
355 if (is_direct_pkt_access)
356 bpf_compute_data_pointers(skb);
357 ret = convert___skb_to_skb(skb, ctx);
360 ret = bpf_test_run(prog, skb, repeat, &retval, &duration);
364 if (skb_headroom(skb) < hh_len) {
365 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
367 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
372 memset(__skb_push(skb, hh_len), 0, hh_len);
374 convert_skb_to___skb(skb, ctx);
377 /* bpf program can never convert linear skb to non-linear */
378 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
379 size = skb_headlen(skb);
380 ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
382 ret = bpf_ctx_finish(kattr, uattr, ctx,
383 sizeof(struct __sk_buff));
386 bpf_sk_storage_free(sk);
392 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
393 union bpf_attr __user *uattr)
395 u32 size = kattr->test.data_size_in;
396 u32 repeat = kattr->test.repeat;
397 struct netdev_rx_queue *rxqueue;
398 struct xdp_buff xdp = {};
399 u32 retval, duration;
403 if (kattr->test.ctx_in || kattr->test.ctx_out)
406 data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0);
408 return PTR_ERR(data);
410 xdp.data_hard_start = data;
411 xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN;
412 xdp.data_meta = xdp.data;
413 xdp.data_end = xdp.data + size;
415 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
416 xdp.rxq = &rxqueue->xdp_rxq;
418 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration);
421 if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN ||
422 xdp.data_end != xdp.data + size)
423 size = xdp.data_end - xdp.data;
424 ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
430 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
432 /* make sure the fields we don't use are zeroed */
433 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
436 /* flags is allowed */
438 if (!range_is_zero(ctx, offsetof(struct bpf_flow_keys, flags) +
439 FIELD_SIZEOF(struct bpf_flow_keys, flags),
440 sizeof(struct bpf_flow_keys)))
446 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
447 const union bpf_attr *kattr,
448 union bpf_attr __user *uattr)
450 u32 size = kattr->test.data_size_in;
451 struct bpf_flow_dissector ctx = {};
452 u32 repeat = kattr->test.repeat;
453 struct bpf_flow_keys *user_ctx;
454 struct bpf_flow_keys flow_keys;
455 u64 time_start, time_spent = 0;
456 const struct ethhdr *eth;
457 unsigned int flags = 0;
458 u32 retval, duration;
463 if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
469 data = bpf_test_init(kattr, size, 0, 0);
471 return PTR_ERR(data);
473 eth = (struct ethhdr *)data;
478 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
479 if (IS_ERR(user_ctx)) {
481 return PTR_ERR(user_ctx);
484 ret = verify_user_bpf_flow_keys(user_ctx);
487 flags = user_ctx->flags;
490 ctx.flow_keys = &flow_keys;
492 ctx.data_end = (__u8 *)data + size;
496 time_start = ktime_get_ns();
497 for (i = 0; i < repeat; i++) {
498 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
501 if (signal_pending(current)) {
509 if (need_resched()) {
510 time_spent += ktime_get_ns() - time_start;
518 time_start = ktime_get_ns();
521 time_spent += ktime_get_ns() - time_start;
525 do_div(time_spent, repeat);
526 duration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
528 ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
531 ret = bpf_ctx_finish(kattr, uattr, user_ctx,
532 sizeof(struct bpf_flow_keys));