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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | // 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); } |