1// SPDX-License-Identifier: GPL-2.0
  2#define _GNU_SOURCE
  3#include <test_progs.h>
  4#include <network_helpers.h>
  5#include "kfree_skb.skel.h"
  6
  7struct meta {
  8	int ifindex;
  9	__u32 cb32_0;
 10	__u8 cb8_0;
 11};
 12
 13static union {
 14	__u32 cb32[5];
 15	__u8 cb8[20];
 16} cb = {
 17	.cb32[0] = 0x81828384,
 18};
 19
 20static void on_sample(void *ctx, int cpu, void *data, __u32 size)
 21{
 22	struct meta *meta = (struct meta *)data;
 23	struct ipv6_packet *pkt_v6 = data + sizeof(*meta);
 24	int duration = 0;
 25
 26	if (CHECK(size != 72 + sizeof(*meta), "check_size", "size %u != %zu\n",
 27		  size, 72 + sizeof(*meta)))
 28		return;
 29	if (CHECK(meta->ifindex != 1, "check_meta_ifindex",
 30		  "meta->ifindex = %d\n", meta->ifindex))
 31		/* spurious kfree_skb not on loopback device */
 32		return;
 33	if (CHECK(meta->cb8_0 != cb.cb8[0], "check_cb8_0", "cb8_0 %x != %x\n",
 34		  meta->cb8_0, cb.cb8[0]))
 35		return;
 36	if (CHECK(meta->cb32_0 != cb.cb32[0], "check_cb32_0",
 37		  "cb32_0 %x != %x\n",
 38		  meta->cb32_0, cb.cb32[0]))
 39		return;
 40	if (CHECK(pkt_v6->eth.h_proto != htons(ETH_P_IPV6), "check_eth",
 41		  "h_proto %x\n", pkt_v6->eth.h_proto))
 42		return;
 43	if (CHECK(pkt_v6->iph.nexthdr != 6, "check_ip",
 44		  "iph.nexthdr %x\n", pkt_v6->iph.nexthdr))
 45		return;
 46	if (CHECK(pkt_v6->tcp.doff != 5, "check_tcp",
 47		  "tcp.doff %x\n", pkt_v6->tcp.doff))
 48		return;
 49
 50	*(bool *)ctx = true;
 51}
 52
 53/* TODO: fix kernel panic caused by this test in parallel mode */
 54void serial_test_kfree_skb(void)
 55{
 56	struct __sk_buff skb = {};
 57	LIBBPF_OPTS(bpf_test_run_opts, topts,
 58		.data_in = &pkt_v6,
 59		.data_size_in = sizeof(pkt_v6),
 60		.ctx_in = &skb,
 61		.ctx_size_in = sizeof(skb),
 62	);
 63	struct kfree_skb *skel = NULL;
 64	struct bpf_link *link;
 65	struct bpf_object *obj;
 66	struct perf_buffer *pb = NULL;
 67	int err, prog_fd;
 68	bool passed = false;
 69	__u32 duration = 0;
 70	const int zero = 0;
 71	bool test_ok[2];
 72
 73	err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
 74				 &obj, &prog_fd);
 75	if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
 76		return;
 77
 78	skel = kfree_skb__open_and_load();
 79	if (!ASSERT_OK_PTR(skel, "kfree_skb_skel"))
 80		goto close_prog;
 81
 82	link = bpf_program__attach_raw_tracepoint(skel->progs.trace_kfree_skb, NULL);
 83	if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
 84		goto close_prog;
 85	skel->links.trace_kfree_skb = link;
 86
 87	link = bpf_program__attach_trace(skel->progs.fentry_eth_type_trans);
 88	if (!ASSERT_OK_PTR(link, "attach fentry"))
 89		goto close_prog;
 90	skel->links.fentry_eth_type_trans = link;
 91
 92	link = bpf_program__attach_trace(skel->progs.fexit_eth_type_trans);
 93	if (!ASSERT_OK_PTR(link, "attach fexit"))
 94		goto close_prog;
 95	skel->links.fexit_eth_type_trans = link;
 96
 97	/* set up perf buffer */
 98	pb = perf_buffer__new(bpf_map__fd(skel->maps.perf_buf_map), 1,
 99			      on_sample, NULL, &passed, NULL);
100	if (!ASSERT_OK_PTR(pb, "perf_buf__new"))
101		goto close_prog;
102
103	memcpy(skb.cb, &cb, sizeof(cb));
104	err = bpf_prog_test_run_opts(prog_fd, &topts);
105	ASSERT_OK(err, "ipv6 test_run");
106	ASSERT_OK(topts.retval, "ipv6 test_run retval");
107
108	/* read perf buffer */
109	err = perf_buffer__poll(pb, 100);
110	if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
111		goto close_prog;
112
113	/* make sure kfree_skb program was triggered
114	 * and it sent expected skb into ring buffer
115	 */
116	ASSERT_TRUE(passed, "passed");
117
118	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.bss), &zero, test_ok);
119	if (CHECK(err, "get_result",
120		  "failed to get output data: %d\n", err))
121		goto close_prog;
122
123	CHECK_FAIL(!test_ok[0] || !test_ok[1]);
124close_prog:
125	perf_buffer__free(pb);
126	bpf_object__close(obj);
127	kfree_skb__destroy(skel);
128}