129 lines · c
1// SPDX-License-Identifier: GPL-2.02#define _GNU_SOURCE3#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 triggered114 * and it sent expected skb into ring buffer115 */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}129