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selftests/bpf: Add Userspace tests for TCP_WINDOW_CLAMP 

Adding selftests for new added functionality to set TCP_WINDOW_CLAMP
from bpf setsockopt.

Signed-off-by: Prankur gupta <prankgup@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201202213152.435886-3-prankgup@fb.com
This commit is contained in:
Prankur gupta 2020-12-02 13:31:52 -08:00 committed by Alexei Starovoitov
parent cb81110997
commit 55144f31f0
4 changed files with 40 additions and 0 deletions
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1
tools/testing/selftests/bpf/bpf_tcp_helpers.h
View File

@ -56,6 +56,7 @@ struct tcp_sock {
__u32 rcv_nxt;
__u32 snd_nxt;
__u32 snd_una;
__u32 window_clamp;
__u8 ecn_flags;
__u32 delivered;
__u32 delivered_ce;

4
tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
View File

@ -42,6 +42,10 @@ static void verify_result(struct tcpbpf_globals *result)
/* check getsockopt for SAVED_SYN */
ASSERT_EQ(result->tcp_saved_syn, 1, "tcp_saved_syn");
/* check getsockopt for window_clamp */
ASSERT_EQ(result->window_clamp_client, 9216, "window_clamp_client");
ASSERT_EQ(result->window_clamp_server, 9216, "window_clamp_server");
}
static void run_test(struct tcpbpf_globals *result)

33
tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
View File

@ -12,17 +12,41 @@
#include <linux/tcp.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#include "bpf_tcp_helpers.h"
#include "test_tcpbpf.h"
struct tcpbpf_globals global = {};
int _version SEC("version") = 1;
/**
* SOL_TCP is defined in <netinet/tcp.h> while
* TCP_SAVED_SYN is defined in already included <linux/tcp.h>
*/
#ifndef SOL_TCP
#define SOL_TCP 6
#endif
static __always_inline int get_tp_window_clamp(struct bpf_sock_ops *skops)
{
struct bpf_sock *sk;
struct tcp_sock *tp;
sk = skops->sk;
if (!sk)
return -1;
tp = bpf_skc_to_tcp_sock(sk);
if (!tp)
return -1;
return tp->window_clamp;
}
SEC("sockops")
int bpf_testcb(struct bpf_sock_ops *skops)
{
char header[sizeof(struct ipv6hdr) + sizeof(struct tcphdr)];
struct bpf_sock_ops *reuse = skops;
struct tcphdr *thdr;
int window_clamp = 9216;
int good_call_rv = 0;
int bad_call_rv = 0;
int save_syn = 1;
@ -75,6 +99,11 @@ int bpf_testcb(struct bpf_sock_ops *skops)
global.event_map |= (1 << op);
switch (op) {
case BPF_SOCK_OPS_TCP_CONNECT_CB:
rv = bpf_setsockopt(skops, SOL_TCP, TCP_WINDOW_CLAMP,
&window_clamp, sizeof(window_clamp));
global.window_clamp_client = get_tp_window_clamp(skops);
break;
case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
/* Test failure to set largest cb flag (assumes not defined) */
global.bad_cb_test_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
@ -100,6 +129,10 @@ int bpf_testcb(struct bpf_sock_ops *skops)
global.tcp_saved_syn = v;
}
}
rv = bpf_setsockopt(skops, SOL_TCP, TCP_WINDOW_CLAMP,
&window_clamp, sizeof(window_clamp));
global.window_clamp_server = get_tp_window_clamp(skops);
break;
case BPF_SOCK_OPS_RTO_CB:
break;

2
tools/testing/selftests/bpf/test_tcpbpf.h
View File

@ -16,5 +16,7 @@ struct tcpbpf_globals {
__u32 num_close_events;
__u32 tcp_save_syn;
__u32 tcp_saved_syn;
__u32 window_clamp_client;
__u32 window_clamp_server;
};
#endif