@@ -379,12 +379,12 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
union bpf_attr __user *uattr)
{
u32 size = kattr->test.data_size_in;
+ struct bpf_flow_dissector ctx = {};
u32 repeat = kattr->test.repeat;
struct bpf_flow_keys flow_keys;
u64 time_start, time_spent = 0;
+ const struct ethhdr *eth;
u32 retval, duration;
- struct sk_buff *skb;
- struct sock *sk;
void *data;
int ret;
u32 i;
@@ -395,43 +395,31 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
if (kattr->test.ctx_in || kattr->test.ctx_out)
return -EINVAL;
- data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
- SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
+ if (size < ETH_HLEN)
+ return -EINVAL;
+
+ data = bpf_test_init(kattr, size, 0, 0);
if (IS_ERR(data))
return PTR_ERR(data);
- sk = kzalloc(sizeof(*sk), GFP_USER);
- if (!sk) {
- kfree(data);
- return -ENOMEM;
- }
- sock_net_set(sk, current->nsproxy->net_ns);
- sock_init_data(NULL, sk);
-
- skb = build_skb(data, 0);
- if (!skb) {
- kfree(data);
- kfree(sk);
- return -ENOMEM;
- }
- skb->sk = sk;
-
- 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);
+ eth = (struct ethhdr *)data;
if (!repeat)
repeat = 1;
+ ctx.flow_keys = &flow_keys;
+ ctx.data = data;
+ ctx.data_end = (__u8 *)data + size;
+
rcu_read_lock();
preempt_disable();
time_start = ktime_get_ns();
for (i = 0; i < repeat; i++) {
- retval = __skb_flow_bpf_dissect(prog, skb,
- &flow_keys_dissector,
- &flow_keys);
+ retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
+ size);
+
+ flow_keys.nhoff -= ETH_HLEN;
+ flow_keys.thoff -= ETH_HLEN;
if (signal_pending(current)) {
preempt_enable();
@@ -464,7 +452,6 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
retval, duration);
out:
- kfree_skb(skb);
- kfree(sk);
+ kfree(data);
return ret;
}
Now that we have bpf_flow_dissect which can work on raw data, use it when doing BPF_PROG_TEST_RUN for flow dissector. Simplifies bpf_prog_test_run_flow_dissector and allows us to test no-skb mode. Note, that previously, with bpf_flow_dissect_skb we used to call eth_type_trans which pulled L2 (ETH_HLEN) header and we explicitly called skb_reset_network_header. That means flow_keys->nhoff would be initialized to 0 (skb_network_offset) in init_flow_keys. Now we call bpf_flow_dissect with nhoff set to ETH_HLEN and need to undo it once the dissection is done to preserve the existing behavior. Signed-off-by: Stanislav Fomichev <sdf@google.com> --- net/bpf/test_run.c | 47 +++++++++++++++++----------------------------- 1 file changed, 17 insertions(+), 30 deletions(-)