Add MPTCP selftest coverage for RECVERR sockopt round-trips and parent-socket MSG_ERRQUEUE delivery. Enable TX software timestamping, send data over an MPTCP socket, wait for POLLERR, and verify that recvmsg(MSG_ERRQUEUE) returns timestamping metadata on the MPTCP parent socket. Signed-off-by: David Carlier Assisted-by: Codex:gpt-5 --- .../selftests/net/mptcp/mptcp_sockopt.c | 152 ++++++++++++++++++ 1 file changed, 152 insertions(+) diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c index b6e58d936ebe..b499e7585d38 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c @@ -26,9 +26,17 @@ #include #include +#include +#include + +#include static int pf = AF_INET; +#ifndef SCM_TIMESTAMPING +#define SCM_TIMESTAMPING SO_TIMESTAMPING +#endif + #ifndef IPPROTO_MPTCP #define IPPROTO_MPTCP 262 #endif @@ -128,6 +136,9 @@ struct so_state { #define MIN(a, b) ((a) < (b) ? (a) : (b)) #endif +static void enable_tx_timestamping(int fd); +static void test_msg_errqueue_timestamping(int fd); + static void __noreturn die_perror(const char *msg) { perror(msg); @@ -598,6 +609,8 @@ static void connect_one_server(int fd, int pipefd) assert(strncmp(buf2, "xmit", 4) == 0); + enable_tx_timestamping(fd); + ret = write(fd, buf, len); if (ret < 0) die_perror("write"); @@ -605,6 +618,8 @@ static void connect_one_server(int fd, int pipefd) if (ret != (ssize_t)len) xerror("short write"); + test_msg_errqueue_timestamping(fd); + total = 0; do { ret = read(fd, buf2 + total, sizeof(buf2) - total); @@ -769,6 +784,142 @@ static void test_ip_tos_sockopt(int fd) xerror("expect socklen_t == -1"); } +static void test_ip_recverr_sockopt(int fd) +{ + struct iovec iov = { + .iov_base = &(char){ 0 }, + .iov_len = 1, + }; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + }; + int one = 1, zero = 0, val = -1; + socklen_t s = sizeof(val); + int level, optname, r; + + switch (pf) { + case AF_INET: + level = SOL_IP; + optname = IP_RECVERR; + break; + case AF_INET6: + level = SOL_IPV6; + optname = IPV6_RECVERR; + break; + default: + xerror("Unknown pf %d\n", pf); + } + + r = setsockopt(fd, level, optname, &one, sizeof(one)); + if (r) + die_perror("setsockopt recverr on"); + + r = getsockopt(fd, level, optname, &val, &s); + if (r) + die_perror("getsockopt recverr on"); + if (s != sizeof(val) || val != one) + xerror("recverr on mismatch val=%d len=%u", val, s); + + r = recvmsg(fd, &msg, MSG_ERRQUEUE | MSG_DONTWAIT); + if (r != -1 || errno != EAGAIN) + xerror("expected empty errqueue to return EAGAIN, ret=%d errno=%d", r, errno); + + r = setsockopt(fd, level, optname, &zero, sizeof(zero)); + if (r) + die_perror("setsockopt recverr off"); + + val = -1; + s = sizeof(val); + r = getsockopt(fd, level, optname, &val, &s); + if (r) + die_perror("getsockopt recverr off"); + if (s != sizeof(val) || val != zero) + xerror("recverr off mismatch val=%d len=%u", val, s); +} + +static void enable_tx_timestamping(int fd) +{ + int val = SOF_TIMESTAMPING_SOFTWARE | + SOF_TIMESTAMPING_TX_SOFTWARE | + SOF_TIMESTAMPING_OPT_TSONLY; + int ret; + + ret = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING_OLD, + &val, sizeof(val)); + if (ret) + die_perror("setsockopt SO_TIMESTAMPING"); +} + +static void test_msg_errqueue_timestamping(int fd) +{ + char ctrl[512] = { 0 }; + char data[32] = { 0 }; + struct iovec iov = { + .iov_base = data, + .iov_len = sizeof(data), + }; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = ctrl, + .msg_controllen = sizeof(ctrl), + }; + struct pollfd pfd = { + .fd = fd, + .events = POLLERR, + }; + struct cmsghdr *cm; + struct scm_timestamping *tss = NULL; + struct sock_extended_err *serr = NULL; + int ret, i; + + for (i = 0; i < 10; i++) { + ret = poll(&pfd, 1, 1000); + if (ret < 0) + die_perror("poll errqueue"); + if (ret == 0) + continue; + if (!(pfd.revents & POLLERR)) + xerror("expected POLLERR, got revents %#x", pfd.revents); + break; + } + + if (i == 10) + xerror("timed out waiting for MSG_ERRQUEUE event"); + + ret = recvmsg(fd, &msg, MSG_ERRQUEUE); + if (ret < 0) + die_perror("recvmsg timestamping errqueue"); + if (!(msg.msg_flags & MSG_ERRQUEUE)) + xerror("expected MSG_ERRQUEUE in msg_flags, got %#x", + msg.msg_flags); + + for (cm = CMSG_FIRSTHDR(&msg); cm; cm = CMSG_NXTHDR(&msg, cm)) { + if (cm->cmsg_level == SOL_SOCKET && + cm->cmsg_type == SCM_TIMESTAMPING) + tss = (void *)CMSG_DATA(cm); + if ((cm->cmsg_level == SOL_IP && + cm->cmsg_type == IP_RECVERR) || + (cm->cmsg_level == SOL_IPV6 && + cm->cmsg_type == IPV6_RECVERR)) + serr = (void *)CMSG_DATA(cm); + } + + if (!tss) + xerror("missing SCM_TIMESTAMPING cmsg"); + if (!serr) + xerror("missing sock_extended_err cmsg"); + if (serr->ee_errno != ENOMSG || + serr->ee_origin != SO_EE_ORIGIN_TIMESTAMPING) + xerror("unexpected timestamping err ee_errno=%u ee_origin=%u", + serr->ee_errno, serr->ee_origin); + if (!tss->ts[0].tv_sec && !tss->ts[0].tv_nsec && + !tss->ts[1].tv_sec && !tss->ts[1].tv_nsec && + !tss->ts[2].tv_sec && !tss->ts[2].tv_nsec) + xerror("all timestamp slots are zero"); +} + static int client(int pipefd) { int fd = -1; @@ -787,6 +938,7 @@ static int client(int pipefd) } test_ip_tos_sockopt(fd); + test_ip_recverr_sockopt(fd); connect_one_server(fd, pipefd); -- 2.53.0