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bpf: selftest: Ensure the child sk inherited all bpf_sock_ops_cb_flags

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This patch adds a test to ensure the child sk inherited everything
from the bpf_sock_ops_cb_flags of the listen sk:
1. Sets one more cb_flags (BPF_SOCK_OPS_STATE_CB_FLAG) to the listen sk
   in test_tcp_hdr_options.c
2. Saves the skops->bpf_sock_ops_cb_flags when handling the newly
   established passive connection
3. CHECK() it is the same as the listen sk

This also covers the fastopen case as the existing test_tcp_hdr_options.c
does.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201002013454.2542367-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau 2020-10-01 18:34:54 -07:00 committed by Alexei Starovoitov
parent 82f45c6c4a
commit 96d46c5085
4 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
tools/testing/selftests/bpf/prog_tests/tcp_hdr_options.c
View File

@ -264,9 +264,19 @@ static int check_error_linum(const struct sk_fds *sk_fds)
static void check_hdr_and_close_fds(struct sk_fds *sk_fds)
{
const __u32 expected_inherit_cb_flags =
BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG |
BPF_SOCK_OPS_STATE_CB_FLAG;
if (sk_fds_shutdown(sk_fds))
goto check_linum;
if (CHECK(expected_inherit_cb_flags != skel->bss->inherit_cb_flags,
"Unexpected inherit_cb_flags", "0x%x != 0x%x\n",
skel->bss->inherit_cb_flags, expected_inherit_cb_flags))
goto check_linum;
if (check_hdr_stg(&exp_passive_hdr_stg, sk_fds->passive_fd,
"passive_hdr_stg"))
goto check_linum;
@ -321,6 +331,8 @@ static void reset_test(void)
memset(&skel->bss->active_estab_in, 0, optsize);
memset(&skel->bss->active_fin_in, 0, optsize);
skel->bss->inherit_cb_flags = 0;
skel->data->test_kind = TCPOPT_EXP;
skel->data->test_magic = 0xeB9F;

4
tools/testing/selftests/bpf/progs/test_misc_tcp_hdr_options.c
View File

@ -304,10 +304,10 @@ int misc_estab(struct bpf_sock_ops *skops)
passive_lport_n = __bpf_htons(passive_lport_h);
bpf_setsockopt(skops, SOL_TCP, TCP_SAVE_SYN,
&true_val, sizeof(true_val));
set_hdr_cb_flags(skops);
set_hdr_cb_flags(skops, 0);
break;
case BPF_SOCK_OPS_TCP_CONNECT_CB:
set_hdr_cb_flags(skops);
set_hdr_cb_flags(skops, 0);
break;
case BPF_SOCK_OPS_PARSE_HDR_OPT_CB:
return handle_parse_hdr(skops);

7
tools/testing/selftests/bpf/progs/test_tcp_hdr_options.c
View File

@ -21,6 +21,7 @@
__u8 test_kind = TCPOPT_EXP;
__u16 test_magic = 0xeB9F;
__u32 inherit_cb_flags = 0;
struct bpf_test_option passive_synack_out = {};
struct bpf_test_option passive_fin_out = {};
@ -467,6 +468,8 @@ static int handle_passive_estab(struct bpf_sock_ops *skops)
struct tcphdr *th;
int err;
inherit_cb_flags = skops->bpf_sock_ops_cb_flags;
err = load_option(skops, &passive_estab_in, true);
if (err == -ENOENT) {
/* saved_syn is not found. It was in syncookie mode.
@ -600,10 +603,10 @@ int estab(struct bpf_sock_ops *skops)
case BPF_SOCK_OPS_TCP_LISTEN_CB:
bpf_setsockopt(skops, SOL_TCP, TCP_SAVE_SYN,
&true_val, sizeof(true_val));
set_hdr_cb_flags(skops);
set_hdr_cb_flags(skops, BPF_SOCK_OPS_STATE_CB_FLAG);
break;
case BPF_SOCK_OPS_TCP_CONNECT_CB:
set_hdr_cb_flags(skops);
set_hdr_cb_flags(skops, 0);
break;
case BPF_SOCK_OPS_PARSE_HDR_OPT_CB:
return handle_parse_hdr(skops);

5
tools/testing/selftests/bpf/test_tcp_hdr_options.h
View File

@ -110,12 +110,13 @@ static inline void clear_hdr_cb_flags(struct bpf_sock_ops *skops)
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG));
}
static inline void set_hdr_cb_flags(struct bpf_sock_ops *skops)
static inline void set_hdr_cb_flags(struct bpf_sock_ops *skops, __u32 extra)
{
bpf_sock_ops_cb_flags_set(skops,
skops->bpf_sock_ops_cb_flags |
BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG);
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG |
extra);
}
static inline void
clear_parse_all_hdr_cb_flags(struct bpf_sock_ops *skops)