Commit 02ee0658 authored by Stanislav Fomichev's avatar Stanislav Fomichev Committed by Daniel Borkmann
Browse files

bpf/flow_dissector: don't adjust nhoff by ETH_HLEN in BPF_PROG_TEST_RUN 



Now that we use skb-less flow dissector let's return true nhoff and
thoff. We used to adjust them by ETH_HLEN because that's how it was
done in the skb case. For VLAN tests that looks confusing: nhoff is
pointing to vlan parts :-\

Warning, this is an API change for BPF_PROG_TEST_RUN! Feel free to drop
if you think that it's too late at this point to fix it.

Signed-off-by: default avatarStanislav Fomichev <sdf@google.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent fe993c64

net/bpf/test_run.c

+0 −3
Original line number Diff line number Diff line
@@ -418,9 +418,6 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 
		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();

			rcu_read_unlock();

tools/testing/selftests/bpf/prog_tests/flow_dissector.c

+9 −14
Original line number Diff line number Diff line
@@ -82,8 +82,8 @@ struct test tests[] = { 
			.tcp.doff = 5,

		},

		.keys = {

			.nhoff = 0,

			.thoff = sizeof(struct iphdr),

			.nhoff = ETH_HLEN,

			.thoff = ETH_HLEN + sizeof(struct iphdr),

			.addr_proto = ETH_P_IP,

			.ip_proto = IPPROTO_TCP,

			.n_proto = __bpf_constant_htons(ETH_P_IP),
@@ -98,8 +98,8 @@ struct test tests[] = { 
			.tcp.doff = 5,

		},

		.keys = {

			.nhoff = 0,

			.thoff = sizeof(struct ipv6hdr),

			.nhoff = ETH_HLEN,

			.thoff = ETH_HLEN + sizeof(struct ipv6hdr),

			.addr_proto = ETH_P_IPV6,

			.ip_proto = IPPROTO_TCP,

			.n_proto = __bpf_constant_htons(ETH_P_IPV6),
@@ -116,8 +116,8 @@ struct test tests[] = { 
			.tcp.doff = 5,

		},

		.keys = {

			.nhoff = VLAN_HLEN,

			.thoff = VLAN_HLEN + sizeof(struct iphdr),

			.nhoff = ETH_HLEN + VLAN_HLEN,

			.thoff = ETH_HLEN + VLAN_HLEN + sizeof(struct iphdr),

			.addr_proto = ETH_P_IP,

			.ip_proto = IPPROTO_TCP,

			.n_proto = __bpf_constant_htons(ETH_P_IP),
@@ -134,8 +134,9 @@ struct test tests[] = { 
			.tcp.doff = 5,

		},

		.keys = {

			.nhoff = VLAN_HLEN * 2,

			.thoff = VLAN_HLEN * 2 + sizeof(struct ipv6hdr),

			.nhoff = ETH_HLEN + VLAN_HLEN * 2,

			.thoff = ETH_HLEN + VLAN_HLEN * 2 +

				sizeof(struct ipv6hdr),

			.addr_proto = ETH_P_IPV6,

			.ip_proto = IPPROTO_TCP,

			.n_proto = __bpf_constant_htons(ETH_P_IPV6),
@@ -238,9 +239,6 @@ void test_flow_dissector(void) 
	 * We use a known path in the net/tun driver that calls

	 * eth_get_headlen and we manually export bpf_flow_keys

	 * via BPF map in this case.

	 *

	 * Note, that since eth_get_headlen operates on a L2 level,

	 * we adjust exported nhoff/thoff by ETH_HLEN.

	 */



	err = bpf_prog_attach(prog_fd, 0, BPF_FLOW_DISSECTOR, 0);
@@ -262,9 +260,6 @@ void test_flow_dissector(void) 
		err = bpf_map_lookup_elem(keys_fd, &key, &flow_keys);

		CHECK_ATTR(err, tests[i].name, "bpf_map_lookup_elem %d\n", err);



		flow_keys.nhoff -= ETH_HLEN;

		flow_keys.thoff -= ETH_HLEN;



		CHECK_ATTR(err, tests[i].name, "skb-less err %d\n", err);

		CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);

	}

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