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Message-Id: <20230620-upstream-net-next-20230620-mptcp-expose-more-info-and-misc-v1-6-62b9444bfd48@tessares.net>
Date: Tue, 20 Jun 2023 18:30:19 +0200
From: Matthieu Baerts <matthieu.baerts@...sares.net>
To: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: [PATCH net-next 6/9] selftests: mptcp: add MPTCP_FULL_INFO
testcase
From: Paolo Abeni <pabeni@...hat.com>
Add a testcase explicitly triggering the newly introduce
MPTCP_FULL_INFO getsockopt.
Link: https://github.com/multipath-tcp/mptcp_net-next/issues/388
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Co-developed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
---
tools/testing/selftests/net/mptcp/mptcp_sockopt.c | 93 ++++++++++++++++++++++-
1 file changed, 91 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c
index 5ee710b30f10..926b0be87c99 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c
@@ -86,9 +86,38 @@ struct mptcp_subflow_addrs {
#define MPTCP_SUBFLOW_ADDRS 3
#endif
+#ifndef MPTCP_FULL_INFO
+struct mptcp_subflow_info {
+ __u32 id;
+ struct mptcp_subflow_addrs addrs;
+};
+
+struct mptcp_full_info {
+ __u32 size_tcpinfo_kernel; /* must be 0, set by kernel */
+ __u32 size_tcpinfo_user;
+ __u32 size_sfinfo_kernel; /* must be 0, set by kernel */
+ __u32 size_sfinfo_user;
+ __u32 num_subflows; /* must be 0, set by kernel (real subflow count) */
+ __u32 size_arrays_user; /* max subflows that userspace is interested in;
+ * the buffers at subflow_info/tcp_info
+ * are respectively at least:
+ * size_arrays * size_sfinfo_user
+ * size_arrays * size_tcpinfo_user
+ * bytes wide
+ */
+ __aligned_u64 subflow_info;
+ __aligned_u64 tcp_info;
+ struct mptcp_info mptcp_info;
+};
+
+#define MPTCP_FULL_INFO 4
+#endif
+
struct so_state {
struct mptcp_info mi;
struct mptcp_info last_sample;
+ struct tcp_info tcp_info;
+ struct mptcp_subflow_addrs addrs;
uint64_t mptcpi_rcv_delta;
uint64_t tcpi_rcv_delta;
bool pkt_stats_avail;
@@ -370,6 +399,8 @@ static void do_getsockopt_tcp_info(struct so_state *s, int fd, size_t r, size_t
olen -= sizeof(struct mptcp_subflow_data);
assert(olen == ti.d.size_user);
+ s->tcp_info = ti.ti[0];
+
if (ti.ti[0].tcpi_bytes_sent == w &&
ti.ti[0].tcpi_bytes_received == r)
goto done;
@@ -391,7 +422,7 @@ static void do_getsockopt_tcp_info(struct so_state *s, int fd, size_t r, size_t
do_getsockopt_bogus_sf_data(fd, MPTCP_TCPINFO);
}
-static void do_getsockopt_subflow_addrs(int fd)
+static void do_getsockopt_subflow_addrs(struct so_state *s, int fd)
{
struct sockaddr_storage remote, local;
socklen_t olen, rlen, llen;
@@ -439,6 +470,7 @@ static void do_getsockopt_subflow_addrs(int fd)
assert(memcmp(&local, &addrs.addr[0].ss_local, sizeof(local)) == 0);
assert(memcmp(&remote, &addrs.addr[0].ss_remote, sizeof(remote)) == 0);
+ s->addrs = addrs.addr[0];
memset(&addrs, 0, sizeof(addrs));
@@ -459,13 +491,70 @@ static void do_getsockopt_subflow_addrs(int fd)
do_getsockopt_bogus_sf_data(fd, MPTCP_SUBFLOW_ADDRS);
}
+static void do_getsockopt_mptcp_full_info(struct so_state *s, int fd)
+{
+ size_t data_size = sizeof(struct mptcp_full_info);
+ struct mptcp_subflow_info sfinfo[2];
+ struct tcp_info tcp_info[2];
+ struct mptcp_full_info mfi;
+ socklen_t olen;
+ int ret;
+
+ memset(&mfi, 0, data_size);
+ memset(tcp_info, 0, sizeof(tcp_info));
+ memset(sfinfo, 0, sizeof(sfinfo));
+
+ mfi.size_tcpinfo_user = sizeof(struct tcp_info);
+ mfi.size_sfinfo_user = sizeof(struct mptcp_subflow_info);
+ mfi.size_arrays_user = 2;
+ mfi.subflow_info = (unsigned long)&sfinfo[0];
+ mfi.tcp_info = (unsigned long)&tcp_info[0];
+ olen = data_size;
+
+ ret = getsockopt(fd, SOL_MPTCP, MPTCP_FULL_INFO, &mfi, &olen);
+ if (ret < 0) {
+ if (errno == EOPNOTSUPP) {
+ perror("MPTCP_FULL_INFO test skipped");
+ return;
+ }
+ xerror("getsockopt MPTCP_FULL_INFO");
+ }
+
+ assert(olen <= data_size);
+ assert(mfi.size_tcpinfo_kernel > 0);
+ assert(mfi.size_tcpinfo_user ==
+ MIN(mfi.size_tcpinfo_kernel, sizeof(struct tcp_info)));
+ assert(mfi.size_sfinfo_kernel > 0);
+ assert(mfi.size_sfinfo_user ==
+ MIN(mfi.size_sfinfo_kernel, sizeof(struct mptcp_subflow_info)));
+ assert(mfi.num_subflows == 1);
+
+ /* Tolerate future extension to mptcp_info struct and running newer
+ * test on top of older kernel.
+ * Anyway any kernel supporting MPTCP_FULL_INFO must at least include
+ * the following in mptcp_info.
+ */
+ assert(olen > (socklen_t)__builtin_offsetof(struct mptcp_full_info, tcp_info));
+ assert(mfi.mptcp_info.mptcpi_subflows == 0);
+ assert(mfi.mptcp_info.mptcpi_bytes_sent == s->last_sample.mptcpi_bytes_sent);
+ assert(mfi.mptcp_info.mptcpi_bytes_received == s->last_sample.mptcpi_bytes_received);
+
+ assert(sfinfo[0].id == 1);
+ assert(tcp_info[0].tcpi_bytes_sent == s->tcp_info.tcpi_bytes_sent);
+ assert(tcp_info[0].tcpi_bytes_received == s->tcp_info.tcpi_bytes_received);
+ assert(!memcmp(&sfinfo->addrs, &s->addrs, sizeof(struct mptcp_subflow_addrs)));
+}
+
static void do_getsockopts(struct so_state *s, int fd, size_t r, size_t w)
{
do_getsockopt_mptcp_info(s, fd, w);
do_getsockopt_tcp_info(s, fd, r, w);
- do_getsockopt_subflow_addrs(fd);
+ do_getsockopt_subflow_addrs(s, fd);
+
+ if (r)
+ do_getsockopt_mptcp_full_info(s, fd);
}
static void connect_one_server(int fd, int pipefd)
--
2.40.1
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