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selftests/bpf: test MSS value returned with bpf_tcp_gen_syncookie

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One remaining difference between test_tcp_check_syncookie.sh and
btf_skc_cls_ingress is a small test on the mss value embedded in the
cookie generated with the eBPF helper.

Bring the corresponding test in btf_skc_cls_ingress.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Link: https://lore.kernel.org/r/20241020-syncookie-v2-5-2db240225fed@bootlin.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2024-10-20 21:22:57 +02:00
committed by Martin KaFai Lau
parent 8a5cd98602
commit 3845ce7477
2 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c
View File

@@ -27,6 +27,8 @@
#define SERVER_ADDR_IPV4 "127.0.0.1"
#define SERVER_ADDR_IPV6 "::1"
#define SERVER_ADDR_DUAL "::0"
/* RFC791, 576 for minimal IPv4 datagram, minus 40 bytes of TCP header */
#define MIN_IPV4_MSS 536
static struct netns_obj *prepare_netns(struct test_btf_skc_cls_ingress *skel)
{
@@ -71,6 +73,7 @@ static void reset_test(struct test_btf_skc_cls_ingress *skel)
skel->bss->recv_cookie = 0;
skel->bss->gen_cookie = 0;
skel->bss->linum = 0;
skel->bss->mss = 0;
}
static void print_err_line(struct test_btf_skc_cls_ingress *skel)
@@ -183,6 +186,10 @@ static void run_test(struct test_btf_skc_cls_ingress *skel, bool gen_cookies,
"syncookie properly generated");
ASSERT_EQ(skel->bss->gen_cookie, skel->bss->recv_cookie,
"matching syncookies on client and server");
ASSERT_GT(skel->bss->mss, MIN_IPV4_MSS,
"MSS in cookie min value");
ASSERT_LT(skel->bss->mss, USHRT_MAX,
"MSS in cookie max value");
}
done:

2
tools/testing/selftests/bpf/progs/test_btf_skc_cls_ingress.c
View File

@@ -15,6 +15,7 @@ __u16 listen_tp_sport = 0;
__u16 req_sk_sport = 0;
__u32 recv_cookie = 0;
__u32 gen_cookie = 0;
__u32 mss = 0;
__u32 linum = 0;
#define LOG() ({ if (!linum) linum = __LINE__; })
@@ -46,6 +47,7 @@ static void test_syncookie_helper(void *iphdr, int iphdr_size,
LOG();
} else {
gen_cookie = (__u32)mss_cookie;
mss = mss_cookie >> 32;
}
} else if (gen_cookie) {
/* It was in cookie mode */