diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/kfree_skb.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/kfree_skb.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/kfree_skb.c b/tools/testing/selftests/bpf/prog_tests/kfree_skb.c new file mode 100644 index 000000000000..430b50de1583 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/kfree_skb.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <test_progs.h> + +static void on_sample(void *ctx, int cpu, void *data, __u32 size) +{ + int ifindex = *(int *)data, duration = 0; + struct ipv6_packet *pkt_v6 = data + 4; + + if (ifindex != 1) + /* spurious kfree_skb not on loopback device */ + return; + if (CHECK(size != 76, "check_size", "size %u != 76\n", size)) + 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; +} + +void test_kfree_skb(void) +{ + struct bpf_prog_load_attr attr = { + .file = "./kfree_skb.o", + }; + + struct bpf_object *obj, *obj2 = NULL; + struct perf_buffer_opts pb_opts = {}; + struct perf_buffer *pb = NULL; + struct bpf_link *link = NULL; + struct bpf_map *perf_buf_map; + struct bpf_program *prog; + __u32 duration, retval; + int err, pkt_fd, kfree_skb_fd; + bool passed = false; + + err = bpf_prog_load("./test_pkt_access.o", BPF_PROG_TYPE_SCHED_CLS, &obj, &pkt_fd); + if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno)) + return; + + err = bpf_prog_load_xattr(&attr, &obj2, &kfree_skb_fd); + if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno)) + goto close_prog; + + prog = bpf_object__find_program_by_title(obj2, "tp_btf/kfree_skb"); + if (CHECK(!prog, "find_prog", "prog kfree_skb not found\n")) + goto close_prog; + link = bpf_program__attach_raw_tracepoint(prog, NULL); + if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link))) + goto close_prog; + + perf_buf_map = bpf_object__find_map_by_name(obj2, "perf_buf_map"); + if (CHECK(!perf_buf_map, "find_perf_buf_map", "not found\n")) + goto close_prog; + + /* set up perf buffer */ + pb_opts.sample_cb = on_sample; + pb_opts.ctx = &passed; + pb = perf_buffer__new(bpf_map__fd(perf_buf_map), 1, &pb_opts); + if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb))) + goto close_prog; + + err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6), + NULL, NULL, &retval, &duration); + CHECK(err || retval, "ipv6", + "err %d errno %d retval %d duration %d\n", + err, errno, retval, duration); + + /* 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 + */ + CHECK_FAIL(!passed); +close_prog: + perf_buffer__free(pb); + if (!IS_ERR_OR_NULL(link)) + bpf_link__destroy(link); + bpf_object__close(obj); + bpf_object__close(obj2); +} |