530 lines
17 KiB
C
530 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2021 Google LLC.
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*/
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#include <test_progs.h>
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#include <cgroup_helpers.h>
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#include <network_helpers.h>
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#include "cgroup_getset_retval_setsockopt.skel.h"
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#include "cgroup_getset_retval_getsockopt.skel.h"
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#include "cgroup_getset_retval_hooks.skel.h"
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#define SOL_CUSTOM 0xdeadbeef
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static int zero;
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static void test_setsockopt_set(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_set_eunatch = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that sets EUNATCH, assert that
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* we actually get that error when we run setsockopt()
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*/
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link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
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goto close_bpf_object;
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if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_set_eunatch);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_setsockopt_set_and_get(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_set_eunatch = NULL, *link_get_retval = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that sets EUNATCH, and one that gets the
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* previously set errno. Assert that we get the same errno back.
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*/
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link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
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goto close_bpf_object;
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 2, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, -EUNATCH, "retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_set_eunatch);
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bpf_link__destroy(link_get_retval);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_setsockopt_default_zero(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_get_retval = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that gets the previously set errno.
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* Assert that, without anything setting one, we get 0.
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*/
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_OK(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, 0, "retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_get_retval);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_setsockopt_default_zero_and_set(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_get_retval = NULL, *link_set_eunatch = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that gets the previously set errno, and then
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* one that sets the errno to EUNATCH. Assert that the get does not
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* see EUNATCH set later, and does not prevent EUNATCH from being set.
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*/
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
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goto close_bpf_object;
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if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 2, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, 0, "retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_get_retval);
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bpf_link__destroy(link_set_eunatch);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_setsockopt_override(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_set_eunatch = NULL, *link_set_eisconn = NULL;
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struct bpf_link *link_get_retval = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that sets EUNATCH, then one that sets EISCONN,
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* and then one that gets the exported errno. Assert both the syscall
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* and the helper sees the last set errno.
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*/
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link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
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goto close_bpf_object;
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link_set_eisconn = bpf_program__attach_cgroup(obj->progs.set_eisconn,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eisconn, "cg-attach-set_eisconn"))
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goto close_bpf_object;
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EISCONN, "setsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 3, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, -EISCONN, "retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_set_eunatch);
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bpf_link__destroy(link_set_eisconn);
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bpf_link__destroy(link_get_retval);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_setsockopt_legacy_eperm(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_legacy_eperm = NULL, *link_get_retval = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that return a reject without setting errno
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* (legacy reject), and one that gets the errno. Assert that for
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* backward compatibility the syscall result in EPERM, and this
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* is also visible to the helper.
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*/
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link_legacy_eperm = bpf_program__attach_cgroup(obj->progs.legacy_eperm,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_legacy_eperm, "cg-attach-legacy_eperm"))
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goto close_bpf_object;
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EPERM, "setsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 2, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, -EPERM, "retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_legacy_eperm);
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bpf_link__destroy(link_get_retval);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_setsockopt_legacy_no_override(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_setsockopt *obj;
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struct bpf_link *link_set_eunatch = NULL, *link_legacy_eperm = NULL;
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struct bpf_link *link_get_retval = NULL;
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obj = cgroup_getset_retval_setsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach setsockopt that sets EUNATCH, then one that return a reject
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* without setting errno, and then one that gets the exported errno.
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* Assert both the syscall and the helper's errno are unaffected by
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* the second prog (i.e. legacy rejects does not override the errno
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* to EPERM).
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*/
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link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
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goto close_bpf_object;
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link_legacy_eperm = bpf_program__attach_cgroup(obj->progs.legacy_eperm,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_legacy_eperm, "cg-attach-legacy_eperm"))
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goto close_bpf_object;
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&zero, sizeof(int)), "setsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 3, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, -EUNATCH, "retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_set_eunatch);
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bpf_link__destroy(link_legacy_eperm);
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bpf_link__destroy(link_get_retval);
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cgroup_getset_retval_setsockopt__destroy(obj);
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}
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static void test_getsockopt_get(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_getsockopt *obj;
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struct bpf_link *link_get_retval = NULL;
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int buf;
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socklen_t optlen = sizeof(buf);
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obj = cgroup_getset_retval_getsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach getsockopt that gets previously set errno. Assert that the
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* error from kernel is in both ctx_retval_value and retval_value.
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*/
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_ERR(getsockopt(sock_fd, SOL_CUSTOM, 0,
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&buf, &optlen), "getsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EOPNOTSUPP, "getsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, -EOPNOTSUPP, "retval_value"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->ctx_retval_value, -EOPNOTSUPP, "ctx_retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_get_retval);
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cgroup_getset_retval_getsockopt__destroy(obj);
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}
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static void test_getsockopt_override(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_getsockopt *obj;
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struct bpf_link *link_set_eisconn = NULL;
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int buf;
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socklen_t optlen = sizeof(buf);
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obj = cgroup_getset_retval_getsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach getsockopt that sets retval to -EISCONN. Assert that this
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* overrides the value from kernel.
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*/
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link_set_eisconn = bpf_program__attach_cgroup(obj->progs.set_eisconn,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eisconn, "cg-attach-set_eisconn"))
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goto close_bpf_object;
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if (!ASSERT_ERR(getsockopt(sock_fd, SOL_CUSTOM, 0,
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&buf, &optlen), "getsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(errno, EISCONN, "getsockopt-errno"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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close_bpf_object:
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bpf_link__destroy(link_set_eisconn);
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cgroup_getset_retval_getsockopt__destroy(obj);
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}
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static void test_getsockopt_retval_sync(int cgroup_fd, int sock_fd)
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{
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struct cgroup_getset_retval_getsockopt *obj;
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struct bpf_link *link_set_eisconn = NULL, *link_clear_retval = NULL;
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struct bpf_link *link_get_retval = NULL;
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int buf;
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socklen_t optlen = sizeof(buf);
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obj = cgroup_getset_retval_getsockopt__open_and_load();
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if (!ASSERT_OK_PTR(obj, "skel-load"))
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return;
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/* Attach getsockopt that sets retval to -EISCONN, and one that clears
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* ctx retval. Assert that the clearing ctx retval is synced to helper
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* and clears any errors both from kernel and BPF..
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*/
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link_set_eisconn = bpf_program__attach_cgroup(obj->progs.set_eisconn,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_set_eisconn, "cg-attach-set_eisconn"))
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goto close_bpf_object;
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link_clear_retval = bpf_program__attach_cgroup(obj->progs.clear_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_clear_retval, "cg-attach-clear_retval"))
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goto close_bpf_object;
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link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
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cgroup_fd);
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if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
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goto close_bpf_object;
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if (!ASSERT_OK(getsockopt(sock_fd, SOL_CUSTOM, 0,
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&buf, &optlen), "getsockopt"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->invocations, 3, "invocations"))
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goto close_bpf_object;
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if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->retval_value, 0, "retval_value"))
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goto close_bpf_object;
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if (!ASSERT_EQ(obj->bss->ctx_retval_value, 0, "ctx_retval_value"))
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goto close_bpf_object;
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close_bpf_object:
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|
bpf_link__destroy(link_set_eisconn);
|
|
bpf_link__destroy(link_clear_retval);
|
|
bpf_link__destroy(link_get_retval);
|
|
|
|
cgroup_getset_retval_getsockopt__destroy(obj);
|
|
}
|
|
|
|
struct exposed_hook {
|
|
const char *name;
|
|
int expected_err;
|
|
} exposed_hooks[] = {
|
|
|
|
#define BPF_RETVAL_HOOK(NAME, SECTION, CTX, EXPECTED_ERR) \
|
|
{ \
|
|
.name = #NAME, \
|
|
.expected_err = EXPECTED_ERR, \
|
|
},
|
|
|
|
#include "cgroup_getset_retval_hooks.h"
|
|
|
|
#undef BPF_RETVAL_HOOK
|
|
};
|
|
|
|
static void test_exposed_hooks(int cgroup_fd, int sock_fd)
|
|
{
|
|
struct cgroup_getset_retval_hooks *skel;
|
|
struct bpf_program *prog;
|
|
int err;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(exposed_hooks); i++) {
|
|
skel = cgroup_getset_retval_hooks__open();
|
|
if (!ASSERT_OK_PTR(skel, "cgroup_getset_retval_hooks__open"))
|
|
continue;
|
|
|
|
prog = bpf_object__find_program_by_name(skel->obj, exposed_hooks[i].name);
|
|
if (!ASSERT_NEQ(prog, NULL, "bpf_object__find_program_by_name"))
|
|
goto close_skel;
|
|
|
|
err = bpf_program__set_autoload(prog, true);
|
|
if (!ASSERT_OK(err, "bpf_program__set_autoload"))
|
|
goto close_skel;
|
|
|
|
err = cgroup_getset_retval_hooks__load(skel);
|
|
ASSERT_EQ(err, exposed_hooks[i].expected_err, "expected_err");
|
|
|
|
close_skel:
|
|
cgroup_getset_retval_hooks__destroy(skel);
|
|
}
|
|
}
|
|
|
|
void test_cgroup_getset_retval(void)
|
|
{
|
|
int cgroup_fd = -1;
|
|
int sock_fd = -1;
|
|
|
|
cgroup_fd = test__join_cgroup("/cgroup_getset_retval");
|
|
if (!ASSERT_GE(cgroup_fd, 0, "cg-create"))
|
|
goto close_fd;
|
|
|
|
sock_fd = start_server(AF_INET, SOCK_DGRAM, NULL, 0, 0);
|
|
if (!ASSERT_GE(sock_fd, 0, "start-server"))
|
|
goto close_fd;
|
|
|
|
if (test__start_subtest("setsockopt-set"))
|
|
test_setsockopt_set(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("setsockopt-set_and_get"))
|
|
test_setsockopt_set_and_get(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("setsockopt-default_zero"))
|
|
test_setsockopt_default_zero(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("setsockopt-default_zero_and_set"))
|
|
test_setsockopt_default_zero_and_set(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("setsockopt-override"))
|
|
test_setsockopt_override(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("setsockopt-legacy_eperm"))
|
|
test_setsockopt_legacy_eperm(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("setsockopt-legacy_no_override"))
|
|
test_setsockopt_legacy_no_override(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("getsockopt-get"))
|
|
test_getsockopt_get(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("getsockopt-override"))
|
|
test_getsockopt_override(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("getsockopt-retval_sync"))
|
|
test_getsockopt_retval_sync(cgroup_fd, sock_fd);
|
|
|
|
if (test__start_subtest("exposed_hooks"))
|
|
test_exposed_hooks(cgroup_fd, sock_fd);
|
|
|
|
close_fd:
|
|
close(cgroup_fd);
|
|
}
|