From 5cbd886ce2a9f4627ff9cdab1bc97a401a24b309 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 3 Dec 2021 14:35:33 -0800 Subject: [PATCH] selftests: mptcp: add TCP_INQ support Do checks on the returned inq counter. Fail on: 1. Huge value (> 1 kbyte, test case files are 1 kb) 2. last hint larger than returned bytes when read was short 3. erronenous indication of EOF. 3) happens when a hint of X bytes reads X-1 on next call but next recvmsg returns more data (instead of EOF). Signed-off-by: Florian Westphal Signed-off-by: Mat Martineau Signed-off-by: Jakub Kicinski --- tools/testing/selftests/net/mptcp/mptcp_connect.c | 60 +++++++++++++++++++++- tools/testing/selftests/net/mptcp/mptcp_sockopt.sh | 4 +- 2 files changed, 61 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c index ada9b80..98de28a 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_connect.c +++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c @@ -73,12 +73,20 @@ static uint32_t cfg_mark; struct cfg_cmsg_types { unsigned int cmsg_enabled:1; unsigned int timestampns:1; + unsigned int tcp_inq:1; }; struct cfg_sockopt_types { unsigned int transparent:1; }; +struct tcp_inq_state { + unsigned int last; + bool expect_eof; +}; + +static struct tcp_inq_state tcp_inq; + static struct cfg_cmsg_types cfg_cmsg_types; static struct cfg_sockopt_types cfg_sockopt_types; @@ -389,7 +397,9 @@ static size_t do_write(const int fd, char *buf, const size_t len) static void process_cmsg(struct msghdr *msgh) { struct __kernel_timespec ts; + bool inq_found = false; bool ts_found = false; + unsigned int inq = 0; struct cmsghdr *cmsg; for (cmsg = CMSG_FIRSTHDR(msgh); cmsg ; cmsg = CMSG_NXTHDR(msgh, cmsg)) { @@ -398,12 +408,27 @@ static void process_cmsg(struct msghdr *msgh) ts_found = true; continue; } + if (cmsg->cmsg_level == IPPROTO_TCP && cmsg->cmsg_type == TCP_CM_INQ) { + memcpy(&inq, CMSG_DATA(cmsg), sizeof(inq)); + inq_found = true; + continue; + } + } if (cfg_cmsg_types.timestampns) { if (!ts_found) xerror("TIMESTAMPNS not present\n"); } + + if (cfg_cmsg_types.tcp_inq) { + if (!inq_found) + xerror("TCP_INQ not present\n"); + + if (inq > 1024) + xerror("tcp_inq %u is larger than one kbyte\n", inq); + tcp_inq.last = inq; + } } static ssize_t do_recvmsg_cmsg(const int fd, char *buf, const size_t len) @@ -420,10 +445,23 @@ static ssize_t do_recvmsg_cmsg(const int fd, char *buf, const size_t len) .msg_controllen = sizeof(msg_buf), }; int flags = 0; + unsigned int last_hint = tcp_inq.last; int ret = recvmsg(fd, &msg, flags); - if (ret <= 0) + if (ret <= 0) { + if (ret == 0 && tcp_inq.expect_eof) + return ret; + + if (ret == 0 && cfg_cmsg_types.tcp_inq) + if (last_hint != 1 && last_hint != 0) + xerror("EOF but last tcp_inq hint was %u\n", last_hint); + return ret; + } + + if (tcp_inq.expect_eof) + xerror("expected EOF, last_hint %u, now %u\n", + last_hint, tcp_inq.last); if (msg.msg_controllen && !cfg_cmsg_types.cmsg_enabled) xerror("got %lu bytes of cmsg data, expected 0\n", @@ -435,6 +473,19 @@ static ssize_t do_recvmsg_cmsg(const int fd, char *buf, const size_t len) if (msg.msg_controllen) process_cmsg(&msg); + if (cfg_cmsg_types.tcp_inq) { + if ((size_t)ret < len && last_hint > (unsigned int)ret) { + if (ret + 1 != (int)last_hint) { + int next = read(fd, msg_buf, sizeof(msg_buf)); + + xerror("read %u of %u, last_hint was %u tcp_inq hint now %u next_read returned %d/%m\n", + ret, (unsigned int)len, last_hint, tcp_inq.last, next); + } else { + tcp_inq.expect_eof = true; + } + } + } + return ret; } @@ -944,6 +995,8 @@ static void apply_cmsg_types(int fd, const struct cfg_cmsg_types *cmsg) if (cmsg->timestampns) xsetsockopt(fd, SOL_SOCKET, SO_TIMESTAMPNS_NEW, &on, sizeof(on)); + if (cmsg->tcp_inq) + xsetsockopt(fd, IPPROTO_TCP, TCP_INQ, &on, sizeof(on)); } static void parse_cmsg_types(const char *type) @@ -965,6 +1018,11 @@ static void parse_cmsg_types(const char *type) return; } + if (strncmp(type, "TCPINQ", len) == 0) { + cfg_cmsg_types.tcp_inq = 1; + return; + } + fprintf(stderr, "Unrecognized cmsg option %s\n", type); exit(1); } diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh index 41de643..c8c3643 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh @@ -178,7 +178,7 @@ do_transfer() timeout ${timeout_test} \ ip netns exec ${listener_ns} \ - $mptcp_connect -t ${timeout_poll} -l -M 1 -p $port -s ${srv_proto} -c TIMESTAMPNS \ + $mptcp_connect -t ${timeout_poll} -l -M 1 -p $port -s ${srv_proto} -c TIMESTAMPNS,TCPINQ \ ${local_addr} < "$sin" > "$sout" & spid=$! @@ -186,7 +186,7 @@ do_transfer() timeout ${timeout_test} \ ip netns exec ${connector_ns} \ - $mptcp_connect -t ${timeout_poll} -M 2 -p $port -s ${cl_proto} -c TIMESTAMPNS \ + $mptcp_connect -t ${timeout_poll} -M 2 -p $port -s ${cl_proto} -c TIMESTAMPNS,TCPINQ \ $connect_addr < "$cin" > "$cout" & cpid=$! -- 2.7.4