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/*
* Copyright 2013 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
#define _GNU_SOURCE
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
// Needed to be able to use syscalls directly and so not depend on newer GLIBC versions
#include
#include
// Needed for UDP_SEGMENT
#include
#include "netty_epoll_linuxsocket.h"
#include "netty_unix_buffer.h"
#include "netty_unix_errors.h"
#include "netty_unix_filedescriptor.h"
#include "netty_unix_jni.h"
#include "netty_unix_limits.h"
#include "netty_unix_socket.h"
#include "netty_unix_util.h"
#include "netty_unix.h"
// Add define if NETTY_BUILD_STATIC is defined so it is picked up in netty_jni_util.c
#ifdef NETTY_BUILD_STATIC
#define NETTY_JNI_UTIL_BUILD_STATIC
#endif
#define STATICALLY_CLASSNAME "io/netty/channel/epoll/NativeStaticallyReferencedJniMethods"
#define NATIVE_CLASSNAME "io/netty/channel/epoll/Native"
// TCP_FASTOPEN is defined in linux 3.7. We define this here so older kernels can compile.
#ifndef TCP_FASTOPEN
#define TCP_FASTOPEN 23
#endif
// Allow to compile on systems with older kernels.
#ifndef UDP_SEGMENT
#define UDP_SEGMENT 103
#endif
// UDP_GRO is defined in linux 5. We define this here so older kernels can compile.
#ifndef UDP_GRO
#define UDP_GRO 104
#endif
#ifdef IP_RECVORIGDSTADDR
#if !defined(SOL_IP) && defined(IPPROTO_IP)
#define SOL_IP IPPROTO_IP
#endif /* !SOL_IP && IPPROTO_IP */
#endif // IP_RECVORIGDSTADDR
// optional
extern int epoll_create1(int flags) __attribute__((weak));
extern int epoll_pwait2(int epfd, struct epoll_event *events, int maxevents, const struct timespec *timeout, const sigset_t *sigmask) __attribute__((weak));
#ifndef __USE_GNU
struct mmsghdr {
struct msghdr msg_hdr; /* Message header */
unsigned int msg_len; /* Number of bytes transmitted */
};
#endif
// All linux syscall numbers are stable so this is safe.
#ifndef SYS_recvmmsg
// Only support SYS_recvmmsg for __x86_64__ / __i386__ for now
#if defined(__x86_64__)
// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_64.tbl
#define SYS_recvmmsg 299
#elif defined(__i386__)
// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_32.tbl
#define SYS_recvmmsg 337
#else
#define SYS_recvmmsg -1
#endif
#endif // SYS_recvmmsg
#ifndef SYS_sendmmsg
// Only support SYS_sendmmsg for __x86_64__ / __i386__ for now
#if defined(__x86_64__)
// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_64.tbl
#define SYS_sendmmsg 307
#elif defined(__i386__)
// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_32.tbl
#define SYS_sendmmsg 345
#else
#define SYS_sendmmsg -1
#endif
#endif // SYS_sendmmsg
// Those are initialized in the init(...) method and cached for performance reasons
static jfieldID packetSenderAddrFieldId = NULL;
static jfieldID packetSenderAddrLenFieldId = NULL;
static jfieldID packetSenderScopeIdFieldId = NULL;
static jfieldID packetSenderPortFieldId = NULL;
static jfieldID packetRecipientAddrFieldId = NULL;
static jfieldID packetRecipientAddrLenFieldId = NULL;
static jfieldID packetRecipientScopeIdFieldId = NULL;
static jfieldID packetRecipientPortFieldId = NULL;
static jfieldID packetSegmentSizeFieldId = NULL;
static jfieldID packetMemoryAddressFieldId = NULL;
static jfieldID packetCountFieldId = NULL;
static const char* staticPackagePrefix = NULL;
static int register_unix_called = 0;
static int epoll_pwait2_supported = 0;
// util methods
static int getSysctlValue(const char * property, int* returnValue) {
int rc = -1;
FILE *fd=fopen(property, "r");
if (fd != NULL) {
char buf[32] = {0x0};
if (fgets(buf, 32, fd) != NULL) {
*returnValue = atoi(buf);
rc = 0;
}
fclose(fd);
}
return rc;
}
static inline jint epollCtl(JNIEnv* env, jint efd, int op, jint fd, jint flags) {
uint32_t events = flags;
struct epoll_event ev = {
.data.fd = fd,
.events = events
};
return epoll_ctl(efd, op, fd, &ev);
}
// JNI Registered Methods Begin
static jint netty_epoll_native_eventFd(JNIEnv* env, jclass clazz) {
jint eventFD = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (eventFD < 0) {
netty_unix_errors_throwChannelExceptionErrorNo(env, "eventfd() failed: ", errno);
}
return eventFD;
}
static jint netty_epoll_native_timerFd(JNIEnv* env, jclass clazz) {
jint timerFD = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
if (timerFD < 0) {
netty_unix_errors_throwChannelExceptionErrorNo(env, "timerfd_create() failed: ", errno);
}
return timerFD;
}
static void netty_epoll_native_eventFdWrite(JNIEnv* env, jclass clazz, jint fd, jlong value) {
uint64_t val;
for (;;) {
jint ret = eventfd_write(fd, (eventfd_t) value);
if (ret < 0) {
// We need to read before we can write again, let's try to read and then write again and if this
// fails we will bail out.
//
// See https://man7.org/linux/man-pages/man2/eventfd.2.html.
if (errno == EAGAIN) {
if (eventfd_read(fd, &val) == 0 || errno == EAGAIN) {
// Try again
continue;
}
netty_unix_errors_throwChannelExceptionErrorNo(env, "eventfd_read(...) failed: ", errno);
} else {
netty_unix_errors_throwChannelExceptionErrorNo(env, "eventfd_write(...) failed: ", errno);
}
}
break;
}
}
static void netty_epoll_native_eventFdRead(JNIEnv* env, jclass clazz, jint fd) {
uint64_t eventfd_t;
if (eventfd_read(fd, &eventfd_t) != 0) {
// something is serious wrong
netty_unix_errors_throwRuntimeException(env, "eventfd_read() failed");
}
}
static jint netty_epoll_native_epollCreate(JNIEnv* env, jclass clazz) {
jint efd;
if (epoll_create1) {
efd = epoll_create1(EPOLL_CLOEXEC);
} else {
// size will be ignored anyway but must be positive
efd = epoll_create(126);
}
if (efd < 0) {
int err = errno;
if (epoll_create1) {
netty_unix_errors_throwChannelExceptionErrorNo(env, "epoll_create1() failed: ", err);
} else {
netty_unix_errors_throwChannelExceptionErrorNo(env, "epoll_create() failed: ", err);
}
return efd;
}
if (!epoll_create1) {
if (fcntl(efd, F_SETFD, FD_CLOEXEC) < 0) {
int err = errno;
close(efd);
netty_unix_errors_throwChannelExceptionErrorNo(env, "fcntl() failed: ", err);
return err;
}
}
return efd;
}
static jint netty_epoll_native_epollWait(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len, jint timeout) {
struct epoll_event *ev = (struct epoll_event*) (intptr_t) address;
int result, err;
do {
result = epoll_wait(efd, ev, len, timeout);
if (result >= 0) {
return result;
}
} while((err = errno) == EINTR);
return -err;
}
// This needs to be consistent with Native.java
#define EPOLL_WAIT_RESULT(V, ARM_TIMER) ((jlong) ((uint64_t) ((uint32_t) V) << 32 | ARM_TIMER))
static jlong netty_epoll_native_epollWait0(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len, jint timerFd, jint tvSec, jint tvNsec, jlong millisThreshold) {
// only reschedule the timer if there is a newer event.
// -1 is a special value used by EpollEventLoop.
uint32_t armTimer = millisThreshold <= 0 ? 1 : 0;
if (tvSec != ((jint) -1) && tvNsec != ((jint) -1)) {
if (millisThreshold > 0 && (tvSec != 0 || tvNsec != 0)) {
// Let's try to reduce the syscalls as much as possible as timerfd_settime(...) can be expensive:
// See https://github.com/netty/netty/issues/11695
if (epoll_pwait2_supported == 1) {
// We have epoll_pwait2(...) and it is supported, this means we can just pass in the itimerspec directly and not need an
// extra syscall even for very small timeouts.
struct timespec ts = { tvSec, tvNsec };
struct epoll_event *ev = (struct epoll_event*) (intptr_t) address;
int result, err;
do {
result = epoll_pwait2(efd, ev, len, &ts, NULL);
if (result >= 0) {
return EPOLL_WAIT_RESULT(result, armTimer);
}
} while((err = errno) == EINTR);
return EPOLL_WAIT_RESULT(-err, armTimer);
}
int millis = tvNsec / 1000000;
// Check if we can reduce the syscall overhead by just use epoll_wait. This is done in cases when we can
// tolerate some "drift".
if (tvNsec == 0 ||
// Let's use the threshold to accept that we may be not 100 % accurate and ignore anything that
// is smaller then 1 ms.
millis >= millisThreshold ||
tvSec > 0) {
millis += tvSec * 1000;
int result = netty_epoll_native_epollWait(env, clazz, efd, address, len, millis);
return EPOLL_WAIT_RESULT(result, armTimer);
}
}
struct itimerspec ts;
memset(&ts.it_interval, 0, sizeof(struct timespec));
ts.it_value.tv_sec = tvSec;
ts.it_value.tv_nsec = tvNsec;
if (timerfd_settime(timerFd, 0, &ts, NULL) < 0) {
netty_unix_errors_throwChannelExceptionErrorNo(env, "timerfd_settime() failed: ", errno);
return -1;
}
armTimer = 1;
}
int result = netty_epoll_native_epollWait(env, clazz, efd, address, len, -1);
return EPOLL_WAIT_RESULT(result, armTimer);
}
static inline void cpu_relax() {
#if defined(__x86_64__)
asm volatile("pause\n": : :"memory");
#elif defined(__aarch64__)
asm volatile("isb\n": : :"memory");
#endif
}
static jint netty_epoll_native_epollBusyWait0(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len) {
struct epoll_event *ev = (struct epoll_event*) (intptr_t) address;
int result, err;
// Zeros = poll (aka return immediately).
do {
result = epoll_wait(efd, ev, len, 0);
if (result == 0) {
// Since we're always polling epoll_wait with no timeout,
// signal CPU that we're in a busy loop
cpu_relax();
}
if (result >= 0) {
return result;
}
} while((err = errno) == EINTR);
return -err;
}
static jint netty_epoll_native_epollCtlAdd0(JNIEnv* env, jclass clazz, jint efd, jint fd, jint flags) {
int res = epollCtl(env, efd, EPOLL_CTL_ADD, fd, flags);
if (res < 0) {
return -errno;
}
return res;
}
static jint netty_epoll_native_epollCtlMod0(JNIEnv* env, jclass clazz, jint efd, jint fd, jint flags) {
int res = epollCtl(env, efd, EPOLL_CTL_MOD, fd, flags);
if (res < 0) {
return -errno;
}
return res;
}
static jint netty_epoll_native_epollCtlDel0(JNIEnv* env, jclass clazz, jint efd, jint fd) {
// Create an empty event to workaround a bug in older kernels which can not handle NULL.
struct epoll_event event = { 0 };
int res = epoll_ctl(efd, EPOLL_CTL_DEL, fd, &event);
if (res < 0) {
return -errno;
}
return res;
}
static jint netty_epoll_native_sendmmsg0(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jobjectArray packets, jint offset, jint len) {
struct mmsghdr msg[len];
struct sockaddr_storage addr[len];
char controls[len][CMSG_SPACE(sizeof(uint16_t))];
socklen_t addrSize;
int i;
memset(msg, 0, sizeof(msg));
for (i = 0; i < len; i++) {
jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
jbyteArray address = (jbyteArray) (*env)->GetObjectField(env, packet, packetRecipientAddrFieldId);
jint addrLen = (*env)->GetIntField(env, packet, packetRecipientAddrLenFieldId);
jint packetSegmentSize = (*env)->GetIntField(env, packet, packetSegmentSizeFieldId);
if (packetSegmentSize > 0) {
msg[i].msg_hdr.msg_control = controls[i];
msg[i].msg_hdr.msg_controllen = sizeof(controls[i]);
struct cmsghdr *cm = CMSG_FIRSTHDR(&msg[i].msg_hdr);
cm->cmsg_level = SOL_UDP;
cm->cmsg_type = UDP_SEGMENT;
cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));
*((uint16_t *) CMSG_DATA(cm)) = packetSegmentSize;
}
if (addrLen != 0) {
jint scopeId = (*env)->GetIntField(env, packet, packetRecipientScopeIdFieldId);
jint port = (*env)->GetIntField(env, packet, packetRecipientPortFieldId);
if (netty_unix_socket_initSockaddr(env, ipv6, address, scopeId, port, &addr[i], &addrSize) == -1) {
return -1;
}
msg[i].msg_hdr.msg_name = &addr[i];
msg[i].msg_hdr.msg_namelen = addrSize;
}
msg[i].msg_hdr.msg_iov = (struct iovec*) (intptr_t) (*env)->GetLongField(env, packet, packetMemoryAddressFieldId);
msg[i].msg_hdr.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
}
ssize_t res;
int err;
do {
// We directly use the syscall to prevent depending on GLIBC 2.14.
res = syscall(SYS_sendmmsg, fd, msg, len, 0);
// keep on writing if it was interrupted
} while (res == -1 && ((err = errno) == EINTR));
if (res < 0) {
return -err;
}
return (jint) res;
}
static void init_packet_address(JNIEnv* env, jobject packet, struct sockaddr_storage* addr, jfieldID addrFieldId,
jfieldID addrLenFieldId, jfieldID scopeIdFieldId, jfieldID portFieldId) {
jbyteArray address = (jbyteArray) (*env)->GetObjectField(env, packet, addrFieldId);
if (addr->ss_family == AF_INET) {
struct sockaddr_in* ipaddr = (struct sockaddr_in*) addr;
(*env)->SetByteArrayRegion(env, address, 0, 4, (jbyte*) &ipaddr->sin_addr.s_addr);
(*env)->SetIntField(env, packet, addrLenFieldId, 4);
(*env)->SetIntField(env, packet, scopeIdFieldId, 0);
(*env)->SetIntField(env, packet, portFieldId, ntohs(ipaddr->sin_port));
} else {
int addrLen = netty_unix_socket_ipAddressLength(addr);
struct sockaddr_in6* ip6addr = (struct sockaddr_in6*) addr;
if (addrLen == 4) {
// IPV4 mapped IPV6 address
jbyte* addr = (jbyte*) &ip6addr->sin6_addr.s6_addr;
(*env)->SetByteArrayRegion(env, address, 0, 4, addr + 12);
} else {
(*env)->SetByteArrayRegion(env, address, 0, 16, (jbyte*) &ip6addr->sin6_addr.s6_addr);
}
(*env)->SetIntField(env, packet, addrLenFieldId, addrLen);
(*env)->SetIntField(env, packet, scopeIdFieldId, ip6addr->sin6_scope_id);
(*env)->SetIntField(env, packet, portFieldId, ntohs(ip6addr->sin6_port));
}
}
static void init_packet(JNIEnv* env, jobject packet, struct msghdr* msg, int len) {
(*env)->SetIntField(env, packet, packetCountFieldId, len);
init_packet_address(env, packet, (struct sockaddr_storage*) msg->msg_name, packetSenderAddrFieldId, packetSenderAddrLenFieldId, packetSenderScopeIdFieldId, packetSenderPortFieldId);
struct cmsghdr *cmsg = NULL;
uint16_t gso_size = 0;
uint16_t *gsosizeptr = NULL;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
if (cmsg->cmsg_level == SOL_UDP && cmsg->cmsg_type == UDP_GRO) {
gsosizeptr = (uint16_t *) CMSG_DATA(cmsg);
gso_size = *gsosizeptr;
}
#ifdef IP_RECVORIGDSTADDR
else if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVORIGDSTADDR) {
init_packet_address(env, packet, (struct sockaddr_storage*) CMSG_DATA(cmsg), packetRecipientAddrFieldId, packetRecipientAddrLenFieldId, packetRecipientScopeIdFieldId, packetRecipientPortFieldId);
}
#endif // IP_RECVORIGDSTADDR
}
(*env)->SetIntField(env, packet, packetSegmentSizeFieldId, gso_size);
}
static jint netty_epoll_native_recvmsg0(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jobject packet) {
struct msghdr msg = { 0 };
struct sockaddr_storage sock_address;
int addrSize = sizeof(sock_address);
// Enough space for GRO and IP_RECVORIGDSTADDR
char control[CMSG_SPACE(sizeof(uint16_t)) + sizeof(struct sockaddr_storage)] = { 0 };
msg.msg_name = &sock_address;
msg.msg_namelen = (socklen_t) addrSize;
msg.msg_iov = (struct iovec*) (intptr_t) (*env)->GetLongField(env, packet, packetMemoryAddressFieldId);
msg.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
msg.msg_control = control;
msg.msg_controllen = sizeof(control);
ssize_t res;
int err;
do {
res = recvmsg(fd, &msg, 0);
// keep on reading if it was interrupted
} while (res == -1 && ((err = errno) == EINTR));
if (res < 0) {
return -err;
}
init_packet(env, packet, &msg, res);
return (jint) res;
}
static jint netty_epoll_native_recvmmsg0(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jobjectArray packets, jint offset, jint len) {
struct mmsghdr msg[len];
memset(msg, 0, sizeof(msg));
struct sockaddr_storage addr[len];
int addrSize = sizeof(addr);
memset(addr, 0, addrSize);
int storageSize = sizeof(struct sockaddr_storage);
char* cntrlbuf = NULL;
#ifdef IP_RECVORIGDSTADDR
int readLocalAddr = 0;
if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_RECVORIGDSTADDR,
&readLocalAddr, sizeof(readLocalAddr)) < 0) {
cntrlbuf = malloc(sizeof(char) * storageSize * len);
}
#endif // IP_RECVORIGDSTADDR
int i;
for (i = 0; i < len; i++) {
jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
msg[i].msg_hdr.msg_iov = (struct iovec*) (intptr_t) (*env)->GetLongField(env, packet, packetMemoryAddressFieldId);
msg[i].msg_hdr.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
msg[i].msg_hdr.msg_name = addr + i;
msg[i].msg_hdr.msg_namelen = (socklen_t) addrSize;
if (cntrlbuf != NULL) {
msg[i].msg_hdr.msg_control = cntrlbuf + i * storageSize;
msg[i].msg_hdr.msg_controllen = storageSize;
}
}
ssize_t res;
int err;
do {
// We directly use the syscall to prevent depending on GLIBC 2.12.
res = syscall(SYS_recvmmsg, fd, &msg, len, 0, NULL);
// keep on reading if it was interrupted
} while (res == -1 && ((err = errno) == EINTR));
if (res >= 0) {
for (i = 0; i < res; i++) {
jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
init_packet(env, packet, &msg[i].msg_hdr, msg[i].msg_len);
}
}
// Free the control message buffer if needed.
free(cntrlbuf);
if (res < 0) {
return -err;
}
return (jint) res;
}
static jstring netty_epoll_native_kernelVersion(JNIEnv* env, jclass clazz) {
struct utsname name;
int res = uname(&name);
if (res == 0) {
return (*env)->NewStringUTF(env, name.release);
}
netty_unix_errors_throwRuntimeExceptionErrorNo(env, "uname() failed: ", errno);
return NULL;
}
static jboolean netty_epoll_native_isSupportingSendmmsg(JNIEnv* env, jclass clazz) {
if (SYS_sendmmsg == -1) {
return JNI_FALSE;
}
if (syscall(SYS_sendmmsg, -1, NULL, 0, 0) == -1) {
if (errno == ENOSYS) {
return JNI_FALSE;
}
}
return JNI_TRUE;
}
static jboolean netty_epoll_native_isSupportingUdpSegment(JNIEnv* env, jclass clazz) {
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd == -1) {
return JNI_FALSE;
}
int gso_size = 512;
int ret = setsockopt(fd, SOL_UDP, UDP_SEGMENT, &gso_size, sizeof(gso_size));
close(fd);
return ret == -1 ? JNI_FALSE : JNI_TRUE;
}
static jboolean netty_epoll_native_isSupportingRecvmmsg(JNIEnv* env, jclass clazz) {
if (SYS_recvmmsg == -1) {
return JNI_FALSE;
}
if (syscall(SYS_recvmmsg, -1, NULL, 0, 0, NULL) == -1) {
if (errno == ENOSYS) {
return JNI_FALSE;
}
}
return JNI_TRUE;
}
static jint netty_epoll_native_tcpFastopenMode(JNIEnv* env, jclass clazz) {
int fastopen = 0;
getSysctlValue("/proc/sys/net/ipv4/tcp_fastopen", &fastopen);
return fastopen;
}
static jint netty_epoll_native_epollet(JNIEnv* env, jclass clazz) {
return EPOLLET;
}
static jint netty_epoll_native_epollin(JNIEnv* env, jclass clazz) {
return EPOLLIN;
}
static jint netty_epoll_native_epollout(JNIEnv* env, jclass clazz) {
return EPOLLOUT;
}
static jint netty_epoll_native_epollrdhup(JNIEnv* env, jclass clazz) {
return EPOLLRDHUP;
}
static jint netty_epoll_native_epollerr(JNIEnv* env, jclass clazz) {
return EPOLLERR;
}
static jint netty_epoll_native_sizeofEpollEvent(JNIEnv* env, jclass clazz) {
return sizeof(struct epoll_event);
}
static jint netty_epoll_native_offsetofEpollData(JNIEnv* env, jclass clazz) {
return offsetof(struct epoll_event, data);
}
static jint netty_epoll_native_splice0(JNIEnv* env, jclass clazz, jint fd, jlong offIn, jint fdOut, jlong offOut, jlong len) {
ssize_t res;
int err;
loff_t off_in = (loff_t) offIn;
loff_t off_out = (loff_t) offOut;
loff_t* p_off_in = off_in >= 0 ? &off_in : NULL;
loff_t* p_off_out = off_out >= 0 ? &off_out : NULL;
do {
res = splice(fd, p_off_in, fdOut, p_off_out, (size_t) len, SPLICE_F_NONBLOCK | SPLICE_F_MOVE);
// keep on splicing if it was interrupted
} while (res == -1 && ((err = errno) == EINTR));
if (res < 0) {
return -err;
}
return (jint) res;
}
static jint netty_epoll_native_tcpMd5SigMaxKeyLen(JNIEnv* env, jclass clazz) {
struct tcp_md5sig md5sig;
// Defensive size check
if (sizeof(md5sig.tcpm_key) < TCP_MD5SIG_MAXKEYLEN) {
return sizeof(md5sig.tcpm_key);
}
return TCP_MD5SIG_MAXKEYLEN;
}
static jint netty_epoll_native_registerUnix(JNIEnv* env, jclass clazz) {
register_unix_called = 1;
return netty_unix_register(env, staticPackagePrefix);
}
// JNI Registered Methods End
// JNI Method Registration Table Begin
static const JNINativeMethod statically_referenced_fixed_method_table[] = {
{ "epollet", "()I", (void *) netty_epoll_native_epollet },
{ "epollin", "()I", (void *) netty_epoll_native_epollin },
{ "epollout", "()I", (void *) netty_epoll_native_epollout },
{ "epollrdhup", "()I", (void *) netty_epoll_native_epollrdhup },
{ "epollerr", "()I", (void *) netty_epoll_native_epollerr },
{ "tcpMd5SigMaxKeyLen", "()I", (void *) netty_epoll_native_tcpMd5SigMaxKeyLen },
{ "isSupportingSendmmsg", "()Z", (void *) netty_epoll_native_isSupportingSendmmsg },
{ "isSupportingRecvmmsg", "()Z", (void *) netty_epoll_native_isSupportingRecvmmsg },
{ "tcpFastopenMode", "()I", (void *) netty_epoll_native_tcpFastopenMode },
{ "kernelVersion", "()Ljava/lang/String;", (void *) netty_epoll_native_kernelVersion }
};
static const jint statically_referenced_fixed_method_table_size = sizeof(statically_referenced_fixed_method_table) / sizeof(statically_referenced_fixed_method_table[0]);
static const JNINativeMethod fixed_method_table[] = {
{ "eventFd", "()I", (void *) netty_epoll_native_eventFd },
{ "timerFd", "()I", (void *) netty_epoll_native_timerFd },
{ "eventFdWrite", "(IJ)V", (void *) netty_epoll_native_eventFdWrite },
{ "eventFdRead", "(I)V", (void *) netty_epoll_native_eventFdRead },
{ "epollCreate", "()I", (void *) netty_epoll_native_epollCreate },
{ "epollWait0", "(IJIIIIJ)J", (void *) netty_epoll_native_epollWait0 },
{ "epollWait", "(IJII)I", (void *) netty_epoll_native_epollWait },
{ "epollBusyWait0", "(IJI)I", (void *) netty_epoll_native_epollBusyWait0 },
{ "epollCtlAdd0", "(III)I", (void *) netty_epoll_native_epollCtlAdd0 },
{ "epollCtlMod0", "(III)I", (void *) netty_epoll_native_epollCtlMod0 },
{ "epollCtlDel0", "(II)I", (void *) netty_epoll_native_epollCtlDel0 },
// "sendmmsg0" has a dynamic signature
{ "sizeofEpollEvent", "()I", (void *) netty_epoll_native_sizeofEpollEvent },
{ "offsetofEpollData", "()I", (void *) netty_epoll_native_offsetofEpollData },
{ "splice0", "(IJIJJ)I", (void *) netty_epoll_native_splice0 },
{ "isSupportingUdpSegment", "()Z", (void *) netty_epoll_native_isSupportingUdpSegment },
{ "registerUnix", "()I", (void *) netty_epoll_native_registerUnix },
};
static const jint fixed_method_table_size = sizeof(fixed_method_table) / sizeof(fixed_method_table[0]);
static jint dynamicMethodsTableSize() {
return fixed_method_table_size + 3; // 3 is for the dynamic method signatures.
}
static JNINativeMethod* createDynamicMethodsTable(const char* packagePrefix) {
char* dynamicTypeName = NULL;
size_t size = sizeof(JNINativeMethod) * dynamicMethodsTableSize();
JNINativeMethod* dynamicMethods = malloc(size);
if (dynamicMethods == NULL) {
return NULL;
}
memset(dynamicMethods, 0, size);
memcpy(dynamicMethods, fixed_method_table, sizeof(fixed_method_table));
JNINativeMethod* dynamicMethod = &dynamicMethods[fixed_method_table_size];
NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;II)I", dynamicTypeName, error);
NETTY_JNI_UTIL_PREPEND("(IZ[L", dynamicTypeName, dynamicMethod->signature, error);
dynamicMethod->name = "sendmmsg0";
dynamicMethod->fnPtr = (void *) netty_epoll_native_sendmmsg0;
netty_jni_util_free_dynamic_name(&dynamicTypeName);
++dynamicMethod;
NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;II)I", dynamicTypeName, error);
NETTY_JNI_UTIL_PREPEND("(IZ[L", dynamicTypeName, dynamicMethod->signature, error);
dynamicMethod->name = "recvmmsg0";
dynamicMethod->fnPtr = (void *) netty_epoll_native_recvmmsg0;
netty_jni_util_free_dynamic_name(&dynamicTypeName);
++dynamicMethod;
NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;)I", dynamicTypeName, error);
NETTY_JNI_UTIL_PREPEND("(IZL", dynamicTypeName, dynamicMethod->signature, error);
dynamicMethod->name = "recvmsg0";
dynamicMethod->fnPtr = (void *) netty_epoll_native_recvmsg0;
netty_jni_util_free_dynamic_name(&dynamicTypeName);
return dynamicMethods;
error:
free(dynamicTypeName);
netty_jni_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
return NULL;
}
// JNI Method Registration Table End
// IMPORTANT: If you add any NETTY_JNI_UTIL_LOAD_CLASS or NETTY_JNI_UTIL_FIND_CLASS calls you also need to update
// Native to reflect that.
static jint netty_epoll_native_JNI_OnLoad(JNIEnv* env, const char* packagePrefix) {
int ret = JNI_ERR;
int staticallyRegistered = 0;
int nativeRegistered = 0;
int linuxsocketOnLoadCalled = 0;
char* nettyClassName = NULL;
jclass nativeDatagramPacketCls = NULL;
JNINativeMethod* dynamicMethods = NULL;
// We must register the statically referenced methods first!
if (netty_jni_util_register_natives(env,
packagePrefix,
STATICALLY_CLASSNAME,
statically_referenced_fixed_method_table,
statically_referenced_fixed_method_table_size) != 0) {
goto done;
}
staticallyRegistered = 1;
// Register the methods which are not referenced by static member variables
dynamicMethods = createDynamicMethodsTable(packagePrefix);
if (dynamicMethods == NULL) {
goto done;
}
if (netty_jni_util_register_natives(env,
packagePrefix,
NATIVE_CLASSNAME,
dynamicMethods,
dynamicMethodsTableSize()) != 0) {
goto done;
}
nativeRegistered = 1;
if (netty_epoll_linuxsocket_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
linuxsocketOnLoadCalled = 1;
// Initialize this module
NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket", nettyClassName, done);
NETTY_JNI_UTIL_FIND_CLASS(env, nativeDatagramPacketCls, nettyClassName, done);
netty_jni_util_free_dynamic_name(&nettyClassName);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderAddrFieldId, "senderAddr", "[B", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderAddrLenFieldId, "senderAddrLen", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderScopeIdFieldId, "senderScopeId", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderPortFieldId, "senderPort", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientAddrFieldId, "recipientAddr", "[B", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientAddrLenFieldId, "recipientAddrLen", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientScopeIdFieldId, "recipientScopeId", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientPortFieldId, "recipientPort", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSegmentSizeFieldId, "segmentSize", "I", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetMemoryAddressFieldId, "memoryAddress", "J", done);
NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetCountFieldId, "count", "I", done);
ret = NETTY_JNI_UTIL_JNI_VERSION;
staticPackagePrefix = packagePrefix;
// Check if there is an epoll_pwait2 system call and also if it works. One some systems it might be there
// but actually is not implemented and so fail with ENOSYS.
// See https://github.com/netty/netty/issues/12343
if (epoll_pwait2) {
int efd = epoll_create(1);
if (efd != -1) {
struct timespec ts = { 0, 0 };
struct epoll_event ev;
do {
if (epoll_pwait2(efd, &ev, 1, &ts, NULL) != -1) {
epoll_pwait2_supported = 1;
break;
}
} while(errno == EINTR);
close(efd);
}
}
done:
netty_jni_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
free(nettyClassName);
if (ret == JNI_ERR) {
if (staticallyRegistered == 1) {
netty_jni_util_unregister_natives(env, packagePrefix, STATICALLY_CLASSNAME);
}
if (nativeRegistered == 1) {
netty_jni_util_unregister_natives(env, packagePrefix, NATIVE_CLASSNAME);
}
if (linuxsocketOnLoadCalled == 1) {
netty_epoll_linuxsocket_JNI_OnUnLoad(env, packagePrefix);
}
packetSenderAddrFieldId = NULL;
packetSenderAddrLenFieldId = NULL;
packetSenderScopeIdFieldId = NULL;
packetSenderPortFieldId = NULL;
packetRecipientAddrFieldId = NULL;
packetRecipientAddrLenFieldId = NULL;
packetRecipientScopeIdFieldId = NULL;
packetRecipientPortFieldId = NULL;
packetSegmentSizeFieldId = NULL;
packetMemoryAddressFieldId = NULL;
packetCountFieldId = NULL;
}
return ret;
}
static void netty_epoll_native_JNI_OnUnload(JNIEnv* env) {
netty_epoll_linuxsocket_JNI_OnUnLoad(env, staticPackagePrefix);
if (register_unix_called == 1) {
register_unix_called = 0;
netty_unix_unregister(env, staticPackagePrefix);
}
netty_jni_util_unregister_natives(env, staticPackagePrefix, STATICALLY_CLASSNAME);
netty_jni_util_unregister_natives(env, staticPackagePrefix, NATIVE_CLASSNAME);
if (staticPackagePrefix != NULL) {
free((void *) staticPackagePrefix);
staticPackagePrefix = NULL;
}
packetSenderAddrFieldId = NULL;
packetSenderAddrLenFieldId = NULL;
packetSenderScopeIdFieldId = NULL;
packetSenderPortFieldId = NULL;
packetRecipientAddrFieldId = NULL;
packetRecipientAddrLenFieldId = NULL;
packetRecipientScopeIdFieldId = NULL;
packetRecipientPortFieldId = NULL;
packetSegmentSizeFieldId = NULL;
packetMemoryAddressFieldId = NULL;
packetCountFieldId = NULL;
}
// Invoked by the JVM when statically linked
// We build with -fvisibility=hidden so ensure we mark everything that needs to be visible with JNIEXPORT
// https://mail.openjdk.java.net/pipermail/core-libs-dev/2013-February/014549.html
// Invoked by the JVM when statically linked
JNIEXPORT jint JNI_OnLoad_netty_transport_native_epoll(JavaVM* vm, void* reserved) {
return netty_jni_util_JNI_OnLoad(vm, reserved, "netty_transport_native_epoll", netty_epoll_native_JNI_OnLoad);
}
// Invoked by the JVM when statically linked
JNIEXPORT void JNI_OnUnload_netty_transport_native_epoll(JavaVM* vm, void* reserved) {
netty_jni_util_JNI_OnUnload(vm, reserved, netty_epoll_native_JNI_OnUnload);
}
#ifndef NETTY_BUILD_STATIC
JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
return netty_jni_util_JNI_OnLoad(vm, reserved, "netty_transport_native_epoll", netty_epoll_native_JNI_OnLoad);
}
JNIEXPORT void JNI_OnUnload(JavaVM* vm, void* reserved) {
netty_jni_util_JNI_OnUnload(vm, reserved, netty_epoll_native_JNI_OnUnload);
}
#endif /* NETTY_BUILD_STATIC */