mirror of https://gitee.com/openkylin/linux.git
selftests/bpf: add sockopt test that exercises BPF_F_ALLOW_MULTI
sockopt test that verifies chaining behavior. v9: * setsockopt chaining example v7: * rework the test to verify cgroup getsockopt chaining Cc: Andrii Nakryiko <andriin@fb.com> Cc: Martin Lau <kafai@fb.com> Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Stanislav Fomichev
Alexei Starovoitov
parent
8a027dc0d8
commit
65b4414a05
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@ -41,3 +41,4 @@ test_btf_dump
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xdping
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test_sockopt
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test_sockopt_sk
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test_sockopt_multi
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@ -26,7 +26,8 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
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test_sock test_btf test_sockmap get_cgroup_id_user test_socket_cookie \
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test_cgroup_storage test_select_reuseport test_section_names \
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test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap \
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test_btf_dump test_cgroup_attach xdping test_sockopt test_sockopt_sk
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test_btf_dump test_cgroup_attach xdping test_sockopt test_sockopt_sk \
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test_sockopt_multi
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BPF_OBJ_FILES = $(patsubst %.c,%.o, $(notdir $(wildcard progs/*.c)))
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TEST_GEN_FILES = $(BPF_OBJ_FILES)
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@ -105,6 +106,7 @@ $(OUTPUT)/test_sysctl: cgroup_helpers.c
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$(OUTPUT)/test_cgroup_attach: cgroup_helpers.c
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$(OUTPUT)/test_sockopt: cgroup_helpers.c
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$(OUTPUT)/test_sockopt_sk: cgroup_helpers.c
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$(OUTPUT)/test_sockopt_multi: cgroup_helpers.c
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.PHONY: force
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@ -0,0 +1,71 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <netinet/in.h>
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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char _license[] SEC("license") = "GPL";
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__u32 _version SEC("version") = 1;
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SEC("cgroup/getsockopt/child")
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int _getsockopt_child(struct bpf_sockopt *ctx)
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{
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__u8 *optval_end = ctx->optval_end;
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__u8 *optval = ctx->optval;
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if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
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return 1;
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if (optval + 1 > optval_end)
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return 0; /* EPERM, bounds check */
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if (optval[0] != 0x80)
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return 0; /* EPERM, unexpected optval from the kernel */
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ctx->retval = 0; /* Reset system call return value to zero */
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optval[0] = 0x90;
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ctx->optlen = 1;
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return 1;
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}
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SEC("cgroup/getsockopt/parent")
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int _getsockopt_parent(struct bpf_sockopt *ctx)
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{
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__u8 *optval_end = ctx->optval_end;
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__u8 *optval = ctx->optval;
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if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
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return 1;
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if (optval + 1 > optval_end)
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return 0; /* EPERM, bounds check */
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if (optval[0] != 0x90)
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return 0; /* EPERM, unexpected optval from the kernel */
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ctx->retval = 0; /* Reset system call return value to zero */
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optval[0] = 0xA0;
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ctx->optlen = 1;
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return 1;
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}
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SEC("cgroup/setsockopt")
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int _setsockopt(struct bpf_sockopt *ctx)
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{
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__u8 *optval_end = ctx->optval_end;
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__u8 *optval = ctx->optval;
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if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
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return 1;
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if (optval + 1 > optval_end)
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return 0; /* EPERM, bounds check */
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optval[0] += 0x10;
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ctx->optlen = 1;
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return 1;
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}
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@ -0,0 +1,374 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <error.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <linux/filter.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "bpf_rlimit.h"
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#include "bpf_util.h"
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#include "cgroup_helpers.h"
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static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title)
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{
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enum bpf_attach_type attach_type;
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enum bpf_prog_type prog_type;
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struct bpf_program *prog;
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int err;
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err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
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if (err) {
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log_err("Failed to deduct types for %s BPF program", title);
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return -1;
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}
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prog = bpf_object__find_program_by_title(obj, title);
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if (!prog) {
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log_err("Failed to find %s BPF program", title);
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return -1;
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}
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err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
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attach_type, BPF_F_ALLOW_MULTI);
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if (err) {
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log_err("Failed to attach %s BPF program", title);
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return -1;
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}
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return 0;
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}
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static int prog_detach(struct bpf_object *obj, int cgroup_fd, const char *title)
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{
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enum bpf_attach_type attach_type;
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enum bpf_prog_type prog_type;
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struct bpf_program *prog;
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int err;
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err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
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if (err)
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return -1;
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prog = bpf_object__find_program_by_title(obj, title);
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if (!prog)
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return -1;
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err = bpf_prog_detach2(bpf_program__fd(prog), cgroup_fd,
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attach_type);
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if (err)
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return -1;
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return 0;
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}
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static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
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int cg_child, int sock_fd)
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{
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socklen_t optlen;
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__u8 buf;
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int err;
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/* Set IP_TOS to the expected value (0x80). */
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buf = 0x80;
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err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
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if (err < 0) {
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log_err("Failed to call setsockopt(IP_TOS)");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0x80) {
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log_err("Unexpected getsockopt 0x%x != 0x80 without BPF", buf);
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err = -1;
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goto detach;
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}
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/* Attach child program and make sure it returns new value:
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* - kernel: -> 0x80
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* - child: 0x80 -> 0x90
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*/
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err = prog_attach(obj, cg_child, "cgroup/getsockopt/child");
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if (err)
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goto detach;
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0x90) {
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log_err("Unexpected getsockopt 0x%x != 0x90", buf);
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err = -1;
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goto detach;
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}
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/* Attach parent program and make sure it returns new value:
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* - kernel: -> 0x80
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* - child: 0x80 -> 0x90
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* - parent: 0x90 -> 0xA0
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*/
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err = prog_attach(obj, cg_parent, "cgroup/getsockopt/parent");
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if (err)
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goto detach;
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0xA0) {
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log_err("Unexpected getsockopt 0x%x != 0xA0", buf);
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err = -1;
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goto detach;
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}
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/* Setting unexpected initial sockopt should return EPERM:
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* - kernel: -> 0x40
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* - child: unexpected 0x40, EPERM
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* - parent: unexpected 0x40, EPERM
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*/
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buf = 0x40;
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if (setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1) < 0) {
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log_err("Failed to call setsockopt(IP_TOS)");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (!err) {
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log_err("Unexpected success from getsockopt(IP_TOS)");
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goto detach;
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}
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/* Detach child program and make sure we still get EPERM:
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* - kernel: -> 0x40
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* - parent: unexpected 0x40, EPERM
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*/
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err = prog_detach(obj, cg_child, "cgroup/getsockopt/child");
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if (err) {
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log_err("Failed to detach child program");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (!err) {
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log_err("Unexpected success from getsockopt(IP_TOS)");
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goto detach;
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}
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/* Set initial value to the one the parent program expects:
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* - kernel: -> 0x90
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* - parent: 0x90 -> 0xA0
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*/
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buf = 0x90;
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err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
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if (err < 0) {
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log_err("Failed to call setsockopt(IP_TOS)");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0xA0) {
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log_err("Unexpected getsockopt 0x%x != 0xA0", buf);
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err = -1;
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goto detach;
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}
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detach:
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prog_detach(obj, cg_child, "cgroup/getsockopt/child");
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prog_detach(obj, cg_parent, "cgroup/getsockopt/parent");
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return err;
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}
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static int run_setsockopt_test(struct bpf_object *obj, int cg_parent,
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int cg_child, int sock_fd)
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{
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socklen_t optlen;
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__u8 buf;
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int err;
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/* Set IP_TOS to the expected value (0x80). */
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buf = 0x80;
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err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
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if (err < 0) {
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log_err("Failed to call setsockopt(IP_TOS)");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0x80) {
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log_err("Unexpected getsockopt 0x%x != 0x80 without BPF", buf);
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err = -1;
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goto detach;
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}
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/* Attach child program and make sure it adds 0x10. */
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err = prog_attach(obj, cg_child, "cgroup/setsockopt");
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if (err)
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goto detach;
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buf = 0x80;
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err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
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if (err < 0) {
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log_err("Failed to call setsockopt(IP_TOS)");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0x80 + 0x10) {
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log_err("Unexpected getsockopt 0x%x != 0x80 + 0x10", buf);
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err = -1;
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goto detach;
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}
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/* Attach parent program and make sure it adds another 0x10. */
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err = prog_attach(obj, cg_parent, "cgroup/setsockopt");
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if (err)
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goto detach;
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buf = 0x80;
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err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
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if (err < 0) {
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log_err("Failed to call setsockopt(IP_TOS)");
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goto detach;
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}
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buf = 0x00;
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optlen = 1;
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err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(IP_TOS)");
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goto detach;
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}
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if (buf != 0x80 + 2 * 0x10) {
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log_err("Unexpected getsockopt 0x%x != 0x80 + 2 * 0x10", buf);
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err = -1;
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goto detach;
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}
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detach:
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prog_detach(obj, cg_child, "cgroup/setsockopt");
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prog_detach(obj, cg_parent, "cgroup/setsockopt");
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return err;
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}
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int main(int argc, char **argv)
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{
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struct bpf_prog_load_attr attr = {
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.file = "./sockopt_multi.o",
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};
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int cg_parent = -1, cg_child = -1;
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struct bpf_object *obj = NULL;
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int sock_fd = -1;
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int err = -1;
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int ignored;
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if (setup_cgroup_environment()) {
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log_err("Failed to setup cgroup environment\n");
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goto out;
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}
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cg_parent = create_and_get_cgroup("/parent");
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if (cg_parent < 0) {
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log_err("Failed to create cgroup /parent\n");
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goto out;
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}
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cg_child = create_and_get_cgroup("/parent/child");
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if (cg_child < 0) {
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log_err("Failed to create cgroup /parent/child\n");
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goto out;
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}
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if (join_cgroup("/parent/child")) {
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log_err("Failed to join cgroup /parent/child\n");
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goto out;
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}
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err = bpf_prog_load_xattr(&attr, &obj, &ignored);
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if (err) {
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log_err("Failed to load BPF object");
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goto out;
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}
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sock_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (sock_fd < 0) {
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log_err("Failed to create socket");
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goto out;
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}
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if (run_getsockopt_test(obj, cg_parent, cg_child, sock_fd))
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err = -1;
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printf("test_sockopt_multi: getsockopt %s\n",
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err ? "FAILED" : "PASSED");
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if (run_setsockopt_test(obj, cg_parent, cg_child, sock_fd))
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err = -1;
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printf("test_sockopt_multi: setsockopt %s\n",
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err ? "FAILED" : "PASSED");
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out:
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close(sock_fd);
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bpf_object__close(obj);
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close(cg_child);
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close(cg_parent);
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printf("test_sockopt_multi: %s\n", err ? "FAILED" : "PASSED");
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return err ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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