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Enable TCP_NODELAY in the 'swtpm' and 'mssim' TCTI modules #3149

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Merged
moritzbuhl merged 1 commit into from
Sep 16, 2026
Merged

Enable TCP_NODELAY in the 'swtpm' and 'mssim' TCTI modules #3149

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18 changes: 16 additions & 2 deletions src/util-io/io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,9 @@
#else
#include <netdb.h> // for addrinfo, freeaddrinfo, gai_strerror, getadd...
#endif
#include <netinet/in.h> // for IPPROTO_TCP, sockaddr_in, sockaddr_in6
#include <poll.h> // for pollfd, poll, POLLIN
#include <netinet/in.h> // for IPPROTO_TCP, sockaddr_in, sockaddr_in6
#include <netinet/tcp.h> // for TCP_NODELAY
#include <poll.h> // for pollfd, poll, POLLIN
#ifndef __ZEPHYR__
#include <sys/un.h> // for sockaddr_un
#endif
Expand Down Expand Up @@ -182,6 +183,15 @@ socket_close(SOCKET *socket) {
return TSS2_RC_SUCCESS;
}

static TSS2_RC
socket_set_nodelay(SOCKET sock) {
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int flag = 1;
if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag)) < 0) {
return TSS2_TCTI_RC_IO_ERROR;
}
return TSS2_RC_SUCCESS;
}

TSS2_RC
socket_connect(const char *hostname, uint16_t port, int control, SOCKET *sock) {
static const struct addrinfo hints
Expand Down Expand Up @@ -259,6 +269,10 @@ socket_connect(const char *hostname, uint16_t port, int control, SOCKET *sock) {
return TSS2_TCTI_RC_IO_ERROR;
}

if (socket_set_nodelay(*sock) != TSS2_RC_SUCCESS) {
LOG_WARNING("Failed to set the TCP_NODELAY option for socket.");
}

return TSS2_RC_SUCCESS;
}

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