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Similarly to the previous test, we also need a test case to cover positive offsets as well, TC is an excellent hook for this. Signed-off-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Tested-by: Zijian Zhang <zijianzhang@bytedance.com> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20241213034057.246437-5-xiyou.wangcong@gmail.com
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <error.h>
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#include <test_progs.h>
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#include <linux/pkt_cls.h>
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#include "test_tc_change_tail.skel.h"
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#include "socket_helpers.h"
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#define LO_IFINDEX 1
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void test_tc_change_tail(void)
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{
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LIBBPF_OPTS(bpf_tcx_opts, tcx_opts);
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struct test_tc_change_tail *skel = NULL;
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struct bpf_link *link;
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int c1, p1;
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char buf[2];
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int ret;
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skel = test_tc_change_tail__open_and_load();
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if (!ASSERT_OK_PTR(skel, "test_tc_change_tail__open_and_load"))
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return;
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link = bpf_program__attach_tcx(skel->progs.change_tail, LO_IFINDEX,
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&tcx_opts);
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if (!ASSERT_OK_PTR(link, "bpf_program__attach_tcx"))
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goto destroy;
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skel->links.change_tail = link;
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ret = create_pair(AF_INET, SOCK_DGRAM, &c1, &p1);
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if (!ASSERT_OK(ret, "create_pair"))
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goto destroy;
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ret = xsend(p1, "Tr", 2, 0);
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ASSERT_EQ(ret, 2, "xsend(p1)");
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ret = recv(c1, buf, 2, 0);
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ASSERT_EQ(ret, 2, "recv(c1)");
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ASSERT_EQ(skel->data->change_tail_ret, 0, "change_tail_ret");
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ret = xsend(p1, "G", 1, 0);
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ASSERT_EQ(ret, 1, "xsend(p1)");
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ret = recv(c1, buf, 2, 0);
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ASSERT_EQ(ret, 1, "recv(c1)");
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ASSERT_EQ(skel->data->change_tail_ret, 0, "change_tail_ret");
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ret = xsend(p1, "E", 1, 0);
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ASSERT_EQ(ret, 1, "xsend(p1)");
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ret = recv(c1, buf, 1, 0);
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ASSERT_EQ(ret, 1, "recv(c1)");
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ASSERT_EQ(skel->data->change_tail_ret, -EINVAL, "change_tail_ret");
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ret = xsend(p1, "Z", 1, 0);
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ASSERT_EQ(ret, 1, "xsend(p1)");
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ret = recv(c1, buf, 1, 0);
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ASSERT_EQ(ret, 1, "recv(c1)");
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ASSERT_EQ(skel->data->change_tail_ret, -EINVAL, "change_tail_ret");
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close(c1);
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close(p1);
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destroy:
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test_tc_change_tail__destroy(skel);
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}
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