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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
#include "kfree_skb.skel.h"
struct meta {
int ifindex;
__u32 cb32_0;
__u8 cb8_0;
};
static union {
__u32 cb32[5];
__u8 cb8[20];
} cb = {
.cb32[0] = 0x81828384,
};
static void on_sample(void *ctx, int cpu, void *data, __u32 size)
{
struct meta *meta = (struct meta *)data;
struct ipv6_packet *pkt_v6 = data + sizeof(*meta);
int duration = 0;
if (CHECK(size != 72 + sizeof(*meta), "check_size", "size %u != %zu\n",
size, 72 + sizeof(*meta)))
return;
if (CHECK(meta->ifindex != 1, "check_meta_ifindex",
"meta->ifindex = %d\n", meta->ifindex))
/* spurious kfree_skb not on loopback device */
return;
if (CHECK(meta->cb8_0 != cb.cb8[0], "check_cb8_0", "cb8_0 %x != %x\n",
meta->cb8_0, cb.cb8[0]))
return;
if (CHECK(meta->cb32_0 != cb.cb32[0], "check_cb32_0",
"cb32_0 %x != %x\n",
meta->cb32_0, cb.cb32[0]))
return;
if (CHECK(pkt_v6->eth.h_proto != 0xdd86, "check_eth",
"h_proto %x\n", pkt_v6->eth.h_proto))
return;
if (CHECK(pkt_v6->iph.nexthdr != 6, "check_ip",
"iph.nexthdr %x\n", pkt_v6->iph.nexthdr))
return;
if (CHECK(pkt_v6->tcp.doff != 5, "check_tcp",
"tcp.doff %x\n", pkt_v6->tcp.doff))
return;
*(bool *)ctx = true;
}
/* TODO: fix kernel panic caused by this test in parallel mode */
void serial_test_kfree_skb(void)
{
struct __sk_buff skb = {};
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v6,
.data_size_in = sizeof(pkt_v6),
.ctx_in = &skb,
.ctx_size_in = sizeof(skb),
);
struct kfree_skb *skel = NULL;
struct bpf_link *link;
struct bpf_object *obj;
struct perf_buffer *pb = NULL;
int err, prog_fd;
bool passed = false;
__u32 duration = 0;
const int zero = 0;
bool test_ok[2];
err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
&obj, &prog_fd);
if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
return;
skel = kfree_skb__open_and_load();
if (!ASSERT_OK_PTR(skel, "kfree_skb_skel"))
goto close_prog;
link = bpf_program__attach_raw_tracepoint(skel->progs.trace_kfree_skb, NULL);
if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
goto close_prog;
skel->links.trace_kfree_skb = link;
link = bpf_program__attach_trace(skel->progs.fentry_eth_type_trans);
if (!ASSERT_OK_PTR(link, "attach fentry"))
goto close_prog;
skel->links.fentry_eth_type_trans = link;
link = bpf_program__attach_trace(skel->progs.fexit_eth_type_trans);
if (!ASSERT_OK_PTR(link, "attach fexit"))
goto close_prog;
skel->links.fexit_eth_type_trans = link;
/* set up perf buffer */
pb = perf_buffer__new(bpf_map__fd(skel->maps.perf_buf_map), 1,
on_sample, NULL, &passed, NULL);
if (!ASSERT_OK_PTR(pb, "perf_buf__new"))
goto close_prog;
memcpy(skb.cb, &cb, sizeof(cb));
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "ipv6 test_run");
ASSERT_OK(topts.retval, "ipv6 test_run retval");
/* read perf buffer */
err = perf_buffer__poll(pb, 100);
if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
goto close_prog;
/* make sure kfree_skb program was triggered
* and it sent expected skb into ring buffer
*/
ASSERT_TRUE(passed, "passed");
err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.bss), &zero, test_ok);
if (CHECK(err, "get_result",
"failed to get output data: %d\n", err))
goto close_prog;
CHECK_FAIL(!test_ok[0] || !test_ok[1]);
close_prog:
perf_buffer__free(pb);
bpf_object__close(obj);
kfree_skb__destroy(skel);
}
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