return ret;
}
+void setSocketIgnorePMTU(int sockfd)
+{
+#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
+#ifdef IP_PMTUDISC_OMIT
+ /* Linux 3.15+ has IP_PMTUDISC_OMIT, which discards PMTU information to prevent
+ poisoning, but still allows fragmentation if the packet size exceeds the
+ outgoing interface MTU, which is good.
+ */
+ try {
+ SSetsockopt(sockfd, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_OMIT);
+ return;
+ }
+ catch(const std::exception& e) {
+ /* failed, let's try IP_PMTUDISC_DONT instead */
+ }
+#endif /* IP_PMTUDISC_OMIT */
+
+ /* IP_PMTUDISC_DONT disables Path MTU discovery */
+ SSetsockopt(sockfd, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_DONT);
+#endif /* defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT) */
+}
bool HarvestTimestamp(struct msghdr* msgh, struct timeval* tv)
{
{
struct msghdr msgh;
struct iovec iov;
- char cbuf[256];
+ cmsgbuf_aligned cbuf;
/* Set up iov and msgh structures. */
memset(&msgh, 0, sizeof(struct msghdr));
msgh.msg_namelen = to.getSocklen();
if(from.sin4.sin_family) {
- addCMsgSrcAddr(&msgh, cbuf, &from, 0);
+ addCMsgSrcAddr(&msgh, &cbuf, &from, 0);
}
else {
msgh.msg_control=NULL;
// be careful: when using this for receive purposes, make sure addr->sin4.sin_family is set appropriately so getSocklen works!
// be careful: when using this function for *send* purposes, be sure to set cbufsize to 0!
// be careful: if you don't call addCMsgSrcAddr after fillMSGHdr, make sure to set msg_control to NULL
-void fillMSGHdr(struct msghdr* msgh, struct iovec* iov, char* cbuf, size_t cbufsize, char* data, size_t datalen, ComboAddress* addr)
+void fillMSGHdr(struct msghdr* msgh, struct iovec* iov, cmsgbuf_aligned* cbuf, size_t cbufsize, char* data, size_t datalen, ComboAddress* addr)
{
iov->iov_base = data;
iov->iov_len = datalen;
*place &= (~((1<<bitsleft)-1));
}
-size_t sendMsgWithTimeout(int fd, const char* buffer, size_t len, int idleTimeout, const ComboAddress* dest, const ComboAddress* local, unsigned int localItf, int totalTimeout, int flags)
+size_t sendMsgWithOptions(int fd, const char* buffer, size_t len, const ComboAddress* dest, const ComboAddress* local, unsigned int localItf, int flags)
{
- int remainingTime = totalTimeout;
- time_t start = 0;
- if (totalTimeout) {
- start = time(nullptr);
- }
-
struct msghdr msgh;
struct iovec iov;
- char cbuf[256];
+ cmsgbuf_aligned cbuf;
/* Set up iov and msgh structures. */
memset(&msgh, 0, sizeof(struct msghdr));
msgh.msg_flags = 0;
if (localItf != 0 && local) {
- addCMsgSrcAddr(&msgh, cbuf, local, localItf);
- }
-
- if (localItf != 0 && local) {
- addCMsgSrcAddr(&msgh, cbuf, local, localItf);
+ addCMsgSrcAddr(&msgh, &cbuf, local, localItf);
}
iov.iov_base = reinterpret_cast<void*>(const_cast<char*>(buffer));
}
/* partial write */
+ firstTry = false;
iov.iov_len -= written;
iov.iov_base = reinterpret_cast<void*>(reinterpret_cast<char*>(iov.iov_base) + written);
written = 0;
}
+ else if (res == 0) {
+ return res;
+ }
else if (res == -1) {
if (errno == EINTR) {
continue;
}
- else if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS) {
+ else if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS || errno == ENOTCONN) {
/* EINPROGRESS might happen with non blocking socket,
especially with TCP Fast Open */
- if (totalTimeout <= 0 && idleTimeout <= 0) {
- return sent;
- }
-
- if (firstTry) {
- int res = waitForRWData(fd, false, (totalTimeout == 0 || idleTimeout <= remainingTime) ? idleTimeout : remainingTime, 0);
- if (res > 0) {
- /* there is room available */
- firstTry = false;
- }
- else if (res == 0) {
- throw runtime_error("Timeout while waiting to write data");
- } else {
- throw runtime_error("Error while waiting for room to write data");
- }
- }
- else {
- throw runtime_error("Timeout while waiting to write data");
- }
+ return sent;
}
else {
unixDie("failed in sendMsgWithTimeout");
}
}
- if (totalTimeout) {
- time_t now = time(nullptr);
- int elapsed = now - start;
- if (elapsed >= remainingTime) {
- throw runtime_error("Timeout while sending data");
- }
- start = now;
- remainingTime -= elapsed;
- }
}
- while (firstTry);
+ while (true);
return 0;
}
template class NetmaskTree<bool>;
-bool sendSizeAndMsgWithTimeout(int sock, uint16_t bufferLen, const char* buffer, int idleTimeout, const ComboAddress* dest, const ComboAddress* local, unsigned int localItf, int totalTimeout, int flags)
-{
- uint16_t size = htons(bufferLen);
- char cbuf[256];
- struct msghdr msgh;
- struct iovec iov[2];
- int remainingTime = totalTimeout;
- time_t start = 0;
- if (totalTimeout) {
- start = time(NULL);
- }
-
- /* Set up iov and msgh structures. */
- memset(&msgh, 0, sizeof(struct msghdr));
- msgh.msg_control = nullptr;
- msgh.msg_controllen = 0;
- if (dest) {
- msgh.msg_name = reinterpret_cast<void*>(const_cast<ComboAddress*>(dest));
- msgh.msg_namelen = dest->getSocklen();
- }
- else {
- msgh.msg_name = nullptr;
- msgh.msg_namelen = 0;
- }
-
- msgh.msg_flags = 0;
-
- if (localItf != 0 && local) {
- addCMsgSrcAddr(&msgh, cbuf, local, localItf);
- }
-
- iov[0].iov_base = &size;
- iov[0].iov_len = sizeof(size);
- iov[1].iov_base = reinterpret_cast<void*>(const_cast<char*>(buffer));
- iov[1].iov_len = bufferLen;
-
- size_t pos = 0;
- size_t sent = 0;
- size_t nbElements = sizeof(iov)/sizeof(*iov);
- while (true) {
- msgh.msg_iov = &iov[pos];
- msgh.msg_iovlen = nbElements - pos;
-
- ssize_t res = sendmsg(sock, &msgh, flags);
- if (res > 0) {
- size_t written = static_cast<size_t>(res);
- sent += written;
-
- if (sent == (sizeof(size) + bufferLen)) {
- return true;
- }
- /* partial write, we need to keep only the (parts of) elements
- that have not been written.
- */
- do {
- if (written < iov[pos].iov_len) {
- iov[pos].iov_len -= written;
- iov[pos].iov_base = reinterpret_cast<void*>(reinterpret_cast<char*>(iov[pos].iov_base) + written);
- written = 0;
- }
- else {
- written -= iov[pos].iov_len;
- iov[pos].iov_len = 0;
- pos++;
- }
- }
- while (written > 0 && pos < nbElements);
- }
- else if (res == -1) {
- if (errno == EINTR) {
- continue;
- }
- else if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS) {
- /* EINPROGRESS might happen with non blocking socket,
- especially with TCP Fast Open */
- int ret = waitForRWData(sock, false, (totalTimeout == 0 || idleTimeout <= remainingTime) ? idleTimeout : remainingTime, 0);
- if (ret > 0) {
- /* there is room available */
- }
- else if (ret == 0) {
- throw runtime_error("Timeout while waiting to send data");
- } else {
- throw runtime_error("Error while waiting for room to send data");
- }
- }
- else {
- unixDie("failed in sendSizeAndMsgWithTimeout");
- }
- }
- if (totalTimeout) {
- time_t now = time(NULL);
- int elapsed = now - start;
- if (elapsed >= remainingTime) {
- throw runtime_error("Timeout while sending data");
- }
- start = now;
- remainingTime -= elapsed;
- }
- }
-
- return false;
-}
-
/* requires a non-blocking socket.
On Linux, we could use MSG_DONTWAIT on a blocking socket
but this is not portable.
projects / thirdparty / pdns.git / blobdiff