128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include <network_helpers.h>
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#include "kfree_skb.skel.h"
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struct meta {
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int ifindex;
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__u32 cb32_0;
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__u8 cb8_0;
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};
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static union {
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__u32 cb32[5];
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__u8 cb8[20];
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} cb = {
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.cb32[0] = 0x81828384,
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};
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static void on_sample(void *ctx, int cpu, void *data, __u32 size)
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{
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struct meta *meta = (struct meta *)data;
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struct ipv6_packet *pkt_v6 = data + sizeof(*meta);
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int duration = 0;
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if (CHECK(size != 72 + sizeof(*meta), "check_size", "size %u != %zu\n",
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size, 72 + sizeof(*meta)))
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return;
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if (CHECK(meta->ifindex != 1, "check_meta_ifindex",
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"meta->ifindex = %d\n", meta->ifindex))
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/* spurious kfree_skb not on loopback device */
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return;
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if (CHECK(meta->cb8_0 != cb.cb8[0], "check_cb8_0", "cb8_0 %x != %x\n",
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meta->cb8_0, cb.cb8[0]))
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return;
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if (CHECK(meta->cb32_0 != cb.cb32[0], "check_cb32_0",
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"cb32_0 %x != %x\n",
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meta->cb32_0, cb.cb32[0]))
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return;
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if (CHECK(pkt_v6->eth.h_proto != htons(ETH_P_IPV6), "check_eth",
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"h_proto %x\n", pkt_v6->eth.h_proto))
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return;
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if (CHECK(pkt_v6->iph.nexthdr != 6, "check_ip",
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"iph.nexthdr %x\n", pkt_v6->iph.nexthdr))
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return;
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if (CHECK(pkt_v6->tcp.doff != 5, "check_tcp",
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"tcp.doff %x\n", pkt_v6->tcp.doff))
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return;
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*(bool *)ctx = true;
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}
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/* TODO: fix kernel panic caused by this test in parallel mode */
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void serial_test_kfree_skb(void)
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{
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struct __sk_buff skb = {};
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LIBBPF_OPTS(bpf_test_run_opts, topts,
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.data_in = &pkt_v6,
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.data_size_in = sizeof(pkt_v6),
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.ctx_in = &skb,
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.ctx_size_in = sizeof(skb),
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);
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struct kfree_skb *skel = NULL;
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struct bpf_link *link;
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struct bpf_object *obj;
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struct perf_buffer *pb = NULL;
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int err, prog_fd;
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bool passed = false;
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__u32 duration = 0;
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const int zero = 0;
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bool test_ok[2];
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err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
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&obj, &prog_fd);
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if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
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return;
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skel = kfree_skb__open_and_load();
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if (!ASSERT_OK_PTR(skel, "kfree_skb_skel"))
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goto close_prog;
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link = bpf_program__attach_raw_tracepoint(skel->progs.trace_kfree_skb, NULL);
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if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
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goto close_prog;
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skel->links.trace_kfree_skb = link;
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link = bpf_program__attach_trace(skel->progs.fentry_eth_type_trans);
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if (!ASSERT_OK_PTR(link, "attach fentry"))
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goto close_prog;
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skel->links.fentry_eth_type_trans = link;
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link = bpf_program__attach_trace(skel->progs.fexit_eth_type_trans);
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if (!ASSERT_OK_PTR(link, "attach fexit"))
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goto close_prog;
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skel->links.fexit_eth_type_trans = link;
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/* set up perf buffer */
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pb = perf_buffer__new(bpf_map__fd(skel->maps.perf_buf_map), 1,
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on_sample, NULL, &passed, NULL);
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if (!ASSERT_OK_PTR(pb, "perf_buf__new"))
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goto close_prog;
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memcpy(skb.cb, &cb, sizeof(cb));
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "ipv6 test_run");
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ASSERT_OK(topts.retval, "ipv6 test_run retval");
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/* read perf buffer */
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err = perf_buffer__poll(pb, 100);
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if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
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goto close_prog;
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/* make sure kfree_skb program was triggered
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* and it sent expected skb into ring buffer
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*/
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ASSERT_TRUE(passed, "passed");
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err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.bss), &zero, test_ok);
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if (CHECK(err, "get_result",
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"failed to get output data: %d\n", err))
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goto close_prog;
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CHECK_FAIL(!test_ok[0] || !test_ok[1]);
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close_prog:
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perf_buffer__free(pb);
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bpf_object__close(obj);
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kfree_skb__destroy(skel);
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}
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