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jdk/src/java.base/unix/native/libnet/net_util_md.c
Chris Hegarty e67dff3af5 8199156: Better route routing 
Reviewed-by: igerasim, mschoene, michaelm, rhalade
2018-08-10 15:02:30 +01:00

1591 lines
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/*
* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <dlfcn.h>
#include <errno.h>
#include <net/if.h>
#include <netinet/tcp.h> // defines TCP_NODELAY
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#if defined(__linux__)
#include <arpa/inet.h>
#include <net/route.h>
#include <sys/utsname.h>
#endif
#if defined(__solaris__)
#include <inet/nd.h>
#include <limits.h>
#include <stropts.h>
#include <sys/filio.h>
#include <sys/sockio.h>
#endif
#if defined(MACOSX)
#include <sys/sysctl.h>
#endif
#include "jvm.h"
#include "net_util.h"
#include "java_net_SocketOptions.h"
#include "java_net_InetAddress.h"
#if defined(__linux__) && !defined(IPV6_FLOWINFO_SEND)
#define IPV6_FLOWINFO_SEND 33
#endif
#if defined(__solaris__) && !defined(MAXINT)
#define MAXINT INT_MAX
#endif
/*
* EXCLBIND socket options only on Solaris
*/
#if defined(__solaris__) && !defined(TCP_EXCLBIND)
#define TCP_EXCLBIND 0x21
#endif
#if defined(__solaris__) && !defined(UDP_EXCLBIND)
#define UDP_EXCLBIND 0x0101
#endif
void setDefaultScopeID(JNIEnv *env, struct sockaddr *him)
{
#ifdef MACOSX
static jclass ni_class = NULL;
static jfieldID ni_defaultIndexID;
if (ni_class == NULL) {
jclass c = (*env)->FindClass(env, "java/net/NetworkInterface");
CHECK_NULL(c);
c = (*env)->NewGlobalRef(env, c);
CHECK_NULL(c);
ni_defaultIndexID = (*env)->GetStaticFieldID(env, c, "defaultIndex", "I");
CHECK_NULL(ni_defaultIndexID);
ni_class = c;
}
int defaultIndex;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)him;
if (sin6->sin6_family == AF_INET6 && (sin6->sin6_scope_id == 0) &&
(IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
defaultIndex = (*env)->GetStaticIntField(env, ni_class,
ni_defaultIndexID);
sin6->sin6_scope_id = defaultIndex;
}
#endif
}
int getDefaultScopeID(JNIEnv *env) {
int defaultIndex = 0;
static jclass ni_class = NULL;
static jfieldID ni_defaultIndexID;
if (ni_class == NULL) {
jclass c = (*env)->FindClass(env, "java/net/NetworkInterface");
CHECK_NULL_RETURN(c, 0);
c = (*env)->NewGlobalRef(env, c);
CHECK_NULL_RETURN(c, 0);
ni_defaultIndexID = (*env)->GetStaticFieldID(env, c, "defaultIndex", "I");
CHECK_NULL_RETURN(ni_defaultIndexID, 0);
ni_class = c;
}
defaultIndex = (*env)->GetStaticIntField(env, ni_class,
ni_defaultIndexID);
return defaultIndex;
}
#define RESTARTABLE(_cmd, _result) do { \
do { \
_result = _cmd; \
} while((_result == -1) && (errno == EINTR)); \
} while(0)
int NET_SocketAvailable(int s, jint *pbytes) {
int result;
RESTARTABLE(ioctl(s, FIONREAD, pbytes), result);
// note: ioctl can return 0 when successful, NET_SocketAvailable
// is expected to return 0 on failure and 1 on success.
return (result == -1) ? 0 : 1;
}
#ifdef __solaris__
static int init_tcp_max_buf, init_udp_max_buf;
static int tcp_max_buf;
static int udp_max_buf;
static int useExclBind = 0;
/*
* Get the specified parameter from the specified driver. The value
* of the parameter is assumed to be an 'int'. If the parameter
* cannot be obtained return -1
*/
int net_getParam(char *driver, char *param)
{
struct strioctl stri;
char buf [64];
int s;
int value;
s = open (driver, O_RDWR);
if (s < 0) {
return -1;
}
strncpy (buf, param, sizeof(buf));
stri.ic_cmd = ND_GET;
stri.ic_timout = 0;
stri.ic_dp = buf;
stri.ic_len = sizeof(buf);
if (ioctl (s, I_STR, &stri) < 0) {
value = -1;
} else {
value = atoi(buf);
}
close (s);
return value;
}
/*
* Iterative way to find the max value that SO_SNDBUF or SO_RCVBUF
* for Solaris versions that do not support the ioctl() in net_getParam().
* Ugly, but only called once (for each sotype).
*
* As an optimization, we make a guess using the default values for Solaris
* assuming they haven't been modified with ndd.
*/
#define MAX_TCP_GUESS 1024 * 1024
#define MAX_UDP_GUESS 2 * 1024 * 1024
#define FAIL_IF_NOT_ENOBUFS if (errno != ENOBUFS) return -1
static int findMaxBuf(int fd, int opt, int sotype) {
int a = 0;
int b = MAXINT;
int initial_guess;
int limit = -1;
if (sotype == SOCK_DGRAM) {
initial_guess = MAX_UDP_GUESS;
} else {
initial_guess = MAX_TCP_GUESS;
}
if (setsockopt(fd, SOL_SOCKET, opt, &initial_guess, sizeof(int)) == 0) {
initial_guess++;
if (setsockopt(fd, SOL_SOCKET, opt, &initial_guess,sizeof(int)) < 0) {
FAIL_IF_NOT_ENOBUFS;
return initial_guess - 1;
}
a = initial_guess;
} else {
FAIL_IF_NOT_ENOBUFS;
b = initial_guess - 1;
}
do {
int mid = a + (b-a)/2;
if (setsockopt(fd, SOL_SOCKET, opt, &mid, sizeof(int)) == 0) {
limit = mid;
a = mid + 1;
} else {
FAIL_IF_NOT_ENOBUFS;
b = mid - 1;
}
} while (b >= a);
return limit;
}
#endif
#ifdef __linux__
static int vinit = 0;
static int kernelV24 = 0;
static int vinit24 = 0;
int kernelIsV24 () {
if (!vinit24) {
struct utsname sysinfo;
if (uname(&sysinfo) == 0) {
sysinfo.release[3] = '\0';
if (strcmp(sysinfo.release, "2.4") == 0) {
kernelV24 = JNI_TRUE;
}
}
vinit24 = 1;
}
return kernelV24;
}
#endif
void
NET_ThrowByNameWithLastError(JNIEnv *env, const char *name,
const char *defaultDetail) {
JNU_ThrowByNameWithMessageAndLastError(env, name, defaultDetail);
}
void
NET_ThrowCurrent(JNIEnv *env, char *msg) {
NET_ThrowNew(env, errno, msg);
}
void
NET_ThrowNew(JNIEnv *env, int errorNumber, char *msg) {
char fullMsg[512];
if (!msg) {
msg = "no further information";
}
switch(errorNumber) {
case EBADF:
jio_snprintf(fullMsg, sizeof(fullMsg), "socket closed: %s", msg);
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", fullMsg);
break;
case EINTR:
JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException", msg);
break;
default:
errno = errorNumber;
JNU_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", msg);
break;
}
}
jfieldID
NET_GetFileDescriptorID(JNIEnv *env)
{
jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor");
CHECK_NULL_RETURN(cls, NULL);
return (*env)->GetFieldID(env, cls, "fd", "I");
}
#if defined(DONT_ENABLE_IPV6)
jint IPv6_supported()
{
return JNI_FALSE;
}
#else /* !DONT_ENABLE_IPV6 */
jint IPv6_supported()
{
int fd;
void *ipv6_fn;
SOCKETADDRESS sa;
socklen_t sa_len = sizeof(SOCKETADDRESS);
fd = socket(AF_INET6, SOCK_STREAM, 0) ;
if (fd < 0) {
/*
* TODO: We really cant tell since it may be an unrelated error
* for now we will assume that AF_INET6 is not available
*/
return JNI_FALSE;
}
/*
* If fd 0 is a socket it means we may have been launched from inetd or
* xinetd. If it's a socket then check the family - if it's an
* IPv4 socket then we need to disable IPv6.
*/
if (getsockname(0, &sa.sa, &sa_len) == 0) {
if (sa.sa.sa_family == AF_INET) {
close(fd);
return JNI_FALSE;
}
}
/**
* Linux - check if any interface has an IPv6 address.
* Don't need to parse the line - we just need an indication.
*/
#ifdef __linux__
{
FILE *fP = fopen("/proc/net/if_inet6", "r");
char buf[255];
char *bufP;
if (fP == NULL) {
close(fd);
return JNI_FALSE;
}
bufP = fgets(buf, sizeof(buf), fP);
fclose(fP);
if (bufP == NULL) {
close(fd);
return JNI_FALSE;
}
}
#endif
/**
* On Solaris 8 it's possible to create INET6 sockets even
* though IPv6 is not enabled on all interfaces. Thus we
* query the number of IPv6 addresses to verify that IPv6
* has been configured on at least one interface.
*
* On Linux it doesn't matter - if IPv6 is built-in the
* kernel then IPv6 addresses will be bound automatically
* to all interfaces.
*/
#ifdef __solaris__
#ifdef SIOCGLIFNUM
{
struct lifnum numifs;
numifs.lifn_family = AF_INET6;
numifs.lifn_flags = 0;
if (ioctl(fd, SIOCGLIFNUM, (char *)&numifs) < 0) {
/**
* SIOCGLIFNUM failed - assume IPv6 not configured
*/
close(fd);
return JNI_FALSE;
}
/**
* If no IPv6 addresses then return false. If count > 0
* it's possible that all IPv6 addresses are "down" but
* that's okay as they may be brought "up" while the
* VM is running.
*/
if (numifs.lifn_count == 0) {
close(fd);
return JNI_FALSE;
}
}
#else
/* SIOCGLIFNUM not defined in build environment ??? */
close(fd);
return JNI_FALSE;
#endif
#endif /* __solaris */
/*
* OK we may have the stack available in the kernel,
* we should also check if the APIs are available.
*/
ipv6_fn = JVM_FindLibraryEntry(RTLD_DEFAULT, "inet_pton");
close(fd);
if (ipv6_fn == NULL ) {
return JNI_FALSE;
} else {
return JNI_TRUE;
}
}
#endif /* DONT_ENABLE_IPV6 */
jint reuseport_supported()
{
/* Do a simple dummy call, and try to figure out from that */
int one = 1;
int rv, s;
s = socket(PF_INET, SOCK_STREAM, 0);
if (s < 0) {
return JNI_FALSE;
}
rv = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (void *)&one, sizeof(one));
if (rv != 0) {
rv = JNI_FALSE;
} else {
rv = JNI_TRUE;
}
close(s);
return rv;
}
void NET_ThrowUnknownHostExceptionWithGaiError(JNIEnv *env,
const char* hostname,
int gai_error)
{
int size;
char *buf;
const char *format = "%s: %s";
const char *error_string = gai_strerror(gai_error);
if (error_string == NULL)
error_string = "unknown error";
size = strlen(format) + strlen(hostname) + strlen(error_string) + 2;
buf = (char *) malloc(size);
if (buf) {
jstring s;
sprintf(buf, format, hostname, error_string);
s = JNU_NewStringPlatform(env, buf);
if (s != NULL) {
jobject x = JNU_NewObjectByName(env,
"java/net/UnknownHostException",
"(Ljava/lang/String;)V", s);
if (x != NULL)
(*env)->Throw(env, x);
}
free(buf);
}
}
#if defined(__linux__)
/* following code creates a list of addresses from the kernel
* routing table that are routed via the loopback address.
* We check all destination addresses against this table
* and override the scope_id field to use the relevant value for "lo"
* in order to work-around the Linux bug that prevents packets destined
* for certain local addresses from being sent via a physical interface.
*/
struct loopback_route {
struct in6_addr addr; /* destination address */
int plen; /* prefix length */
};
static struct loopback_route *loRoutes = 0;
static int nRoutes = 0; /* number of routes */
static int loRoutes_size = 16; /* initial size */
static int lo_scope_id = 0;
static void initLoopbackRoutes();
void printAddr (struct in6_addr *addr) {
int i;
for (i=0; i<16; i++) {
printf ("%02x", addr->s6_addr[i]);
}
printf ("\n");
}
static jboolean needsLoopbackRoute (struct in6_addr* dest_addr) {
int byte_count;
int extra_bits, i;
struct loopback_route *ptr;
if (loRoutes == 0) {
initLoopbackRoutes();
}
for (ptr = loRoutes, i=0; i<nRoutes; i++, ptr++) {
struct in6_addr *target_addr=&ptr->addr;
int dest_plen = ptr->plen;
byte_count = dest_plen >> 3;
extra_bits = dest_plen & 0x3;
if (byte_count > 0) {
if (memcmp(target_addr, dest_addr, byte_count)) {
continue; /* no match */
}
}
if (extra_bits > 0) {
unsigned char c1 = ((unsigned char *)target_addr)[byte_count];
unsigned char c2 = ((unsigned char *)&dest_addr)[byte_count];
unsigned char mask = 0xff << (8 - extra_bits);
if ((c1 & mask) != (c2 & mask)) {
continue;
}
}
return JNI_TRUE;
}
return JNI_FALSE;
}
static void initLoopbackRoutes() {
FILE *f;
char srcp[8][5];
char hopp[8][5];
int dest_plen, src_plen, use, refcnt, metric;
unsigned long flags;
char dest_str[40];
struct in6_addr dest_addr;
char device[16];
struct loopback_route *loRoutesTemp;
if (loRoutes != 0) {
free (loRoutes);
}
loRoutes = calloc (loRoutes_size, sizeof(struct loopback_route));
if (loRoutes == 0) {
return;
}
/*
* Scan /proc/net/ipv6_route looking for a matching
* route.
*/
if ((f = fopen("/proc/net/ipv6_route", "r")) == NULL) {
return ;
}
while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
"%4s%4s%4s%4s%4s%4s%4s%4s %02x "
"%4s%4s%4s%4s%4s%4s%4s%4s "
"%08x %08x %08x %08lx %8s",
dest_str, &dest_str[5], &dest_str[10], &dest_str[15],
&dest_str[20], &dest_str[25], &dest_str[30], &dest_str[35],
&dest_plen,
srcp[0], srcp[1], srcp[2], srcp[3],
srcp[4], srcp[5], srcp[6], srcp[7],
&src_plen,
hopp[0], hopp[1], hopp[2], hopp[3],
hopp[4], hopp[5], hopp[6], hopp[7],
&metric, &use, &refcnt, &flags, device) == 31) {
/*
* Some routes should be ignored
*/
if ( (dest_plen < 0 || dest_plen > 128) ||
(src_plen != 0) ||
(flags & (RTF_POLICY | RTF_FLOW)) ||
((flags & RTF_REJECT) && dest_plen == 0) ) {
continue;
}
/*
* Convert the destination address
*/
dest_str[4] = ':';
dest_str[9] = ':';
dest_str[14] = ':';
dest_str[19] = ':';
dest_str[24] = ':';
dest_str[29] = ':';
dest_str[34] = ':';
dest_str[39] = '\0';
if (inet_pton(AF_INET6, dest_str, &dest_addr) < 0) {
/* not an Ipv6 address */
continue;
}
if (strcmp(device, "lo") != 0) {
/* Not a loopback route */
continue;
} else {
if (nRoutes == loRoutes_size) {
loRoutesTemp = realloc (loRoutes, loRoutes_size *
sizeof (struct loopback_route) * 2);
if (loRoutesTemp == 0) {
free(loRoutes);
loRoutes = NULL;
nRoutes = 0;
fclose (f);
return;
}
loRoutes=loRoutesTemp;
loRoutes_size *= 2;
}
memcpy (&loRoutes[nRoutes].addr,&dest_addr,sizeof(struct in6_addr));
loRoutes[nRoutes].plen = dest_plen;
nRoutes ++;
}
}
fclose (f);
{
/* now find the scope_id for "lo" */
char devname[21];
char addr6p[8][5];
int plen, scope, dad_status, if_idx;
if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) {
while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %08x %02x %02x %02x %20s\n",
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
addr6p[4], addr6p[5], addr6p[6], addr6p[7],
&if_idx, &plen, &scope, &dad_status, devname) == 13) {
if (strcmp(devname, "lo") == 0) {
/*
* Found - so just return the index
*/
fclose(f);
lo_scope_id = if_idx;
return;
}
}
fclose(f);
}
}
}
/*
* Following is used for binding to local addresses. Equivalent
* to code above, for bind().
*/
struct localinterface {
int index;
char localaddr [16];
};
static struct localinterface *localifs = 0;
static int localifsSize = 0; /* size of array */
static int nifs = 0; /* number of entries used in array */
/* not thread safe: make sure called once from one thread */
static void initLocalIfs () {
FILE *f;
unsigned char staddr [16];
char ifname [33];
struct localinterface *lif=0;
int index, x1, x2, x3;
unsigned int u0,u1,u2,u3,u4,u5,u6,u7,u8,u9,ua,ub,uc,ud,ue,uf;
if ((f = fopen("/proc/net/if_inet6", "r")) == NULL) {
return ;
}
while (fscanf (f, "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x "
"%d %x %x %x %32s",&u0,&u1,&u2,&u3,&u4,&u5,&u6,&u7,
&u8,&u9,&ua,&ub,&uc,&ud,&ue,&uf,
&index, &x1, &x2, &x3, ifname) == 21) {
staddr[0] = (unsigned char)u0;
staddr[1] = (unsigned char)u1;
staddr[2] = (unsigned char)u2;
staddr[3] = (unsigned char)u3;
staddr[4] = (unsigned char)u4;
staddr[5] = (unsigned char)u5;
staddr[6] = (unsigned char)u6;
staddr[7] = (unsigned char)u7;
staddr[8] = (unsigned char)u8;
staddr[9] = (unsigned char)u9;
staddr[10] = (unsigned char)ua;
staddr[11] = (unsigned char)ub;
staddr[12] = (unsigned char)uc;
staddr[13] = (unsigned char)ud;
staddr[14] = (unsigned char)ue;
staddr[15] = (unsigned char)uf;
nifs ++;
if (nifs > localifsSize) {
localifs = (struct localinterface *) realloc (
localifs, sizeof (struct localinterface)* (localifsSize+5));
if (localifs == 0) {
nifs = 0;
fclose (f);
return;
}
lif = localifs + localifsSize;
localifsSize += 5;
} else {
lif ++;
}
memcpy (lif->localaddr, staddr, 16);
lif->index = index;
}
fclose (f);
}
/* return the scope_id (interface index) of the
* interface corresponding to the given address
* returns 0 if no match found
*/
static int getLocalScopeID (char *addr) {
struct localinterface *lif;
int i;
if (localifs == 0) {
initLocalIfs();
}
for (i=0, lif=localifs; i<nifs; i++, lif++) {
if (memcmp (addr, lif->localaddr, 16) == 0) {
return lif->index;
}
}
return 0;
}
void platformInit () {
initLoopbackRoutes();
initLocalIfs();
}
#elif defined(_AIX)
/* Initialize stubs for blocking I/O workarounds (see src/solaris/native/java/net/linux_close.c) */
extern void aix_close_init();
void platformInit () {
aix_close_init();
}
#else
void platformInit () {}
#endif
void parseExclusiveBindProperty(JNIEnv *env) {
#ifdef __solaris__
jstring s, flagSet;
jclass iCls;
jmethodID mid;
s = (*env)->NewStringUTF(env, "sun.net.useExclusiveBind");
CHECK_NULL(s);
iCls = (*env)->FindClass(env, "java/lang/System");
CHECK_NULL(iCls);
mid = (*env)->GetStaticMethodID(env, iCls, "getProperty",
"(Ljava/lang/String;)Ljava/lang/String;");
CHECK_NULL(mid);
flagSet = (*env)->CallStaticObjectMethod(env, iCls, mid, s);
if (flagSet != NULL) {
useExclBind = 1;
}
#endif
}
JNIEXPORT jint JNICALL
NET_EnableFastTcpLoopback(int fd) {
return 0;
}
/**
* See net_util.h for documentation
*/
JNIEXPORT int JNICALL
NET_InetAddressToSockaddr(JNIEnv *env, jobject iaObj, int port,
SOCKETADDRESS *sa, int *len,
jboolean v4MappedAddress)
{
jint family = getInetAddress_family(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
memset((char *)sa, 0, sizeof(SOCKETADDRESS));
if (ipv6_available() &&
!(family == java_net_InetAddress_IPv4 &&
v4MappedAddress == JNI_FALSE))
{
jbyte caddr[16];
jint address;
if (family == java_net_InetAddress_IPv4) {
// convert to IPv4-mapped address
memset((char *)caddr, 0, 16);
address = getInetAddress_addr(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
if (address == INADDR_ANY) {
/* we would always prefer IPv6 wildcard address
* caddr[10] = 0xff;
* caddr[11] = 0xff; */
} else {
caddr[10] = 0xff;
caddr[11] = 0xff;
caddr[12] = ((address >> 24) & 0xff);
caddr[13] = ((address >> 16) & 0xff);
caddr[14] = ((address >> 8) & 0xff);
caddr[15] = (address & 0xff);
}
} else {
getInet6Address_ipaddress(env, iaObj, (char *)caddr);
}
sa->sa6.sin6_port = htons(port);
memcpy((void *)&sa->sa6.sin6_addr, caddr, sizeof(struct in6_addr));
sa->sa6.sin6_family = AF_INET6;
if (len != NULL) {
*len = sizeof(struct sockaddr_in6);
}
#ifdef __linux__
/*
* On Linux if we are connecting to a
*
* - link-local address
* - multicast interface-local or link-local address
*
* we need to specify the interface in the scope_id.
*
* If the scope was cached then we use the cached value. If not cached but
* specified in the Inet6Address we use that, but we first check if the
* address needs to be routed via the loopback interface. In this case,
* we override the specified value with that of the loopback interface.
* If no cached value exists and no value was specified by user, then
* we try to determine a value from the routing table. In all these
* cases the used value is cached for further use.
*/
if (IN6_IS_ADDR_LINKLOCAL(&sa->sa6.sin6_addr)
|| IN6_IS_ADDR_MC_NODELOCAL(&sa->sa6.sin6_addr)
|| IN6_IS_ADDR_MC_LINKLOCAL(&sa->sa6.sin6_addr)) {
unsigned int cached_scope_id = 0, scope_id = 0;
if (ia6_cachedscopeidID) {
cached_scope_id = (int)(*env)->GetIntField(env, iaObj, ia6_cachedscopeidID);
/* if cached value exists then use it. Otherwise, check
* if scope is set in the address.
*/
if (!cached_scope_id) {
if (ia6_scopeidID) {
scope_id = getInet6Address_scopeid(env, iaObj);
}
if (scope_id != 0) {
/* check user-specified value for loopback case
* that needs to be overridden
*/
if (kernelIsV24() && needsLoopbackRoute(&sa->sa6.sin6_addr)) {
cached_scope_id = lo_scope_id;
(*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id);
}
} else {
/*
* Otherwise consult the IPv6 routing tables to
* try determine the appropriate interface.
*/
if (kernelIsV24()) {
cached_scope_id = getDefaultIPv6Interface(&sa->sa6.sin6_addr);
} else {
cached_scope_id = getLocalScopeID((char *)&(sa->sa6.sin6_addr));
if (cached_scope_id == 0) {
cached_scope_id = getDefaultIPv6Interface(&sa->sa6.sin6_addr);
}
}
(*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id);
}
}
}
/*
* If we have a scope_id use the extended form
* of sockaddr_in6.
*/
sa->sa6.sin6_scope_id = cached_scope_id == 0 ? scope_id : cached_scope_id;
}
#else
/* handle scope_id */
if (family != java_net_InetAddress_IPv4) {
if (ia6_scopeidID) {
sa->sa6.sin6_scope_id = getInet6Address_scopeid(env, iaObj);
}
}
#endif
} else {
jint address;
if (family != java_net_InetAddress_IPv4) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Protocol family unavailable");
return -1;
}
address = getInetAddress_addr(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
sa->sa4.sin_port = htons(port);
sa->sa4.sin_addr.s_addr = htonl(address);
sa->sa4.sin_family = AF_INET;
if (len != NULL) {
*len = sizeof(struct sockaddr_in);
}
}
return 0;
}
void
NET_SetTrafficClass(SOCKETADDRESS *sa, int trafficClass) {
if (sa->sa.sa_family == AF_INET6) {
sa->sa6.sin6_flowinfo = htonl((trafficClass & 0xff) << 20);
}
}
int
NET_IsIPv4Mapped(jbyte* caddr) {
int i;
for (i = 0; i < 10; i++) {
if (caddr[i] != 0x00) {
return 0; /* false */
}
}
if (((caddr[10] & 0xff) == 0xff) && ((caddr[11] & 0xff) == 0xff)) {
return 1; /* true */
}
return 0; /* false */
}
int
NET_IPv4MappedToIPv4(jbyte* caddr) {
return ((caddr[12] & 0xff) << 24) | ((caddr[13] & 0xff) << 16) | ((caddr[14] & 0xff) << 8)
| (caddr[15] & 0xff);
}
int
NET_IsEqual(jbyte* caddr1, jbyte* caddr2) {
int i;
for (i = 0; i < 16; i++) {
if (caddr1[i] != caddr2[i]) {
return 0; /* false */
}
}
return 1;
}
int NET_IsZeroAddr(jbyte* caddr) {
int i;
for (i = 0; i < 16; i++) {
if (caddr[i] != 0) {
return 0;
}
}
return 1;
}
/*
* Map the Java level socket option to the platform specific
* level and option name.
*/
int
NET_MapSocketOption(jint cmd, int *level, int *optname) {
static struct {
jint cmd;
int level;
int optname;
} const opts[] = {
{ java_net_SocketOptions_TCP_NODELAY, IPPROTO_TCP, TCP_NODELAY },
{ java_net_SocketOptions_SO_OOBINLINE, SOL_SOCKET, SO_OOBINLINE },
{ java_net_SocketOptions_SO_LINGER, SOL_SOCKET, SO_LINGER },
{ java_net_SocketOptions_SO_SNDBUF, SOL_SOCKET, SO_SNDBUF },
{ java_net_SocketOptions_SO_RCVBUF, SOL_SOCKET, SO_RCVBUF },
{ java_net_SocketOptions_SO_KEEPALIVE, SOL_SOCKET, SO_KEEPALIVE },
{ java_net_SocketOptions_SO_REUSEADDR, SOL_SOCKET, SO_REUSEADDR },
{ java_net_SocketOptions_SO_REUSEPORT, SOL_SOCKET, SO_REUSEPORT },
{ java_net_SocketOptions_SO_BROADCAST, SOL_SOCKET, SO_BROADCAST },
{ java_net_SocketOptions_IP_TOS, IPPROTO_IP, IP_TOS },
{ java_net_SocketOptions_IP_MULTICAST_IF, IPPROTO_IP, IP_MULTICAST_IF },
{ java_net_SocketOptions_IP_MULTICAST_IF2, IPPROTO_IP, IP_MULTICAST_IF },
{ java_net_SocketOptions_IP_MULTICAST_LOOP, IPPROTO_IP, IP_MULTICAST_LOOP },
};
int i;
if (ipv6_available()) {
switch (cmd) {
// Different multicast options if IPv6 is enabled
case java_net_SocketOptions_IP_MULTICAST_IF:
case java_net_SocketOptions_IP_MULTICAST_IF2:
*level = IPPROTO_IPV6;
*optname = IPV6_MULTICAST_IF;
return 0;
case java_net_SocketOptions_IP_MULTICAST_LOOP:
*level = IPPROTO_IPV6;
*optname = IPV6_MULTICAST_LOOP;
return 0;
#if (defined(__solaris__) || defined(MACOSX))
// Map IP_TOS request to IPV6_TCLASS
case java_net_SocketOptions_IP_TOS:
*level = IPPROTO_IPV6;
*optname = IPV6_TCLASS;
return 0;
#endif
}
}
/*
* Map the Java level option to the native level
*/
for (i=0; i<(int)(sizeof(opts) / sizeof(opts[0])); i++) {
if (cmd == opts[i].cmd) {
*level = opts[i].level;
*optname = opts[i].optname;
return 0;
}
}
/* not found */
return -1;
}
/*
* Determine the default interface for an IPv6 address.
*
* 1. Scans /proc/net/ipv6_route for a matching route
* (eg: fe80::/10 or a route for the specific address).
* This will tell us the interface to use (eg: "eth0").
*
* 2. Lookup /proc/net/if_inet6 to map the interface
* name to an interface index.
*
* Returns :-
* -1 if error
* 0 if no matching interface
* >1 interface index to use for the link-local address.
*/
#if defined(__linux__)
int getDefaultIPv6Interface(struct in6_addr *target_addr) {
FILE *f;
char srcp[8][5];
char hopp[8][5];
int dest_plen, src_plen, use, refcnt, metric;
unsigned long flags;
char dest_str[40];
struct in6_addr dest_addr;
char device[16];
jboolean match = JNI_FALSE;
/*
* Scan /proc/net/ipv6_route looking for a matching
* route.
*/
if ((f = fopen("/proc/net/ipv6_route", "r")) == NULL) {
return -1;
}
while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
"%4s%4s%4s%4s%4s%4s%4s%4s %02x "
"%4s%4s%4s%4s%4s%4s%4s%4s "
"%08x %08x %08x %08lx %8s",
dest_str, &dest_str[5], &dest_str[10], &dest_str[15],
&dest_str[20], &dest_str[25], &dest_str[30], &dest_str[35],
&dest_plen,
srcp[0], srcp[1], srcp[2], srcp[3],
srcp[4], srcp[5], srcp[6], srcp[7],
&src_plen,
hopp[0], hopp[1], hopp[2], hopp[3],
hopp[4], hopp[5], hopp[6], hopp[7],
&metric, &use, &refcnt, &flags, device) == 31) {
/*
* Some routes should be ignored
*/
if ( (dest_plen < 0 || dest_plen > 128) ||
(src_plen != 0) ||
(flags & (RTF_POLICY | RTF_FLOW)) ||
((flags & RTF_REJECT) && dest_plen == 0) ) {
continue;
}
/*
* Convert the destination address
*/
dest_str[4] = ':';
dest_str[9] = ':';
dest_str[14] = ':';
dest_str[19] = ':';
dest_str[24] = ':';
dest_str[29] = ':';
dest_str[34] = ':';
dest_str[39] = '\0';
if (inet_pton(AF_INET6, dest_str, &dest_addr) < 0) {
/* not an Ipv6 address */
continue;
} else {
/*
* The prefix len (dest_plen) indicates the number of bits we
* need to match on.
*
* dest_plen / 8 => number of bytes to match
* dest_plen % 8 => number of additional bits to match
*
* eg: fe80::/10 => match 1 byte + 2 additional bits in the
* next byte.
*/
int byte_count = dest_plen >> 3;
int extra_bits = dest_plen & 0x3;
if (byte_count > 0) {
if (memcmp(target_addr, &dest_addr, byte_count)) {
continue; /* no match */
}
}
if (extra_bits > 0) {
unsigned char c1 = ((unsigned char *)target_addr)[byte_count];
unsigned char c2 = ((unsigned char *)&dest_addr)[byte_count];
unsigned char mask = 0xff << (8 - extra_bits);
if ((c1 & mask) != (c2 & mask)) {
continue;
}
}
/*
* We have a match
*/
match = JNI_TRUE;
break;
}
}
fclose(f);
/*
* If there's a match then we lookup the interface
* index.
*/
if (match) {
char devname[21];
char addr6p[8][5];
int plen, scope, dad_status, if_idx;
if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) {
while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %08x %02x %02x %02x %20s\n",
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
addr6p[4], addr6p[5], addr6p[6], addr6p[7],
&if_idx, &plen, &scope, &dad_status, devname) == 13) {
if (strcmp(devname, device) == 0) {
/*
* Found - so just return the index
*/
fclose(f);
return if_idx;
}
}
fclose(f);
} else {
/*
* Couldn't open /proc/net/if_inet6
*/
return -1;
}
}
/*
* If we get here it means we didn't there wasn't any
* route or we couldn't get the index of the interface.
*/
return 0;
}
#endif
/*
* Wrapper for getsockopt system routine - does any necessary
* pre/post processing to deal with OS specific oddities :-
*
* On Linux the SO_SNDBUF/SO_RCVBUF values must be post-processed
* to compensate for an incorrect value returned by the kernel.
*/
int
NET_GetSockOpt(int fd, int level, int opt, void *result,
int *len)
{
int rv;
socklen_t socklen = *len;
rv = getsockopt(fd, level, opt, result, &socklen);
*len = socklen;
if (rv < 0) {
return rv;
}
#ifdef __linux__
/*
* On Linux SO_SNDBUF/SO_RCVBUF aren't symmetric. This
* stems from additional socket structures in the send
* and receive buffers.
*/
if ((level == SOL_SOCKET) && ((opt == SO_SNDBUF)
|| (opt == SO_RCVBUF))) {
int n = *((int *)result);
n /= 2;
*((int *)result) = n;
}
#endif
/* Workaround for Mac OS treating linger value as
* signed integer
*/
#ifdef MACOSX
if (level == SOL_SOCKET && opt == SO_LINGER) {
struct linger* to_cast = (struct linger*)result;
to_cast->l_linger = (unsigned short)to_cast->l_linger;
}
#endif
return rv;
}
/*
* Wrapper for setsockopt system routine - performs any
* necessary pre/post processing to deal with OS specific
* issue :-
*
* On Solaris need to limit the suggested value for SO_SNDBUF
* and SO_RCVBUF to the kernel configured limit
*
* For IP_TOS socket option need to mask off bits as this
* aren't automatically masked by the kernel and results in
* an error.
*/
int
NET_SetSockOpt(int fd, int level, int opt, const void *arg,
int len)
{
#ifndef IPTOS_TOS_MASK
#define IPTOS_TOS_MASK 0x1e
#endif
#ifndef IPTOS_PREC_MASK
#define IPTOS_PREC_MASK 0xe0
#endif
#if defined(_ALLBSD_SOURCE)
#if defined(KIPC_MAXSOCKBUF)
int mib[3];
size_t rlen;
#endif
int *bufsize;
#ifdef __APPLE__
static int maxsockbuf = -1;
#else
static long maxsockbuf = -1;
#endif
#endif
/*
* IPPROTO/IP_TOS :-
* 1. IPv6 on Solaris/Mac OS:
* Set the TOS OR Traffic Class value to cater for
* IPv6 and IPv4 scenarios.
* 2. IPv6 on Linux: By default Linux ignores flowinfo
* field so enable IPV6_FLOWINFO_SEND so that flowinfo
* will be examined. We also set the IPv4 TOS option in this case.
* 3. IPv4: set socket option based on ToS and Precedence
* fields (otherwise get invalid argument)
*/
if (level == IPPROTO_IP && opt == IP_TOS) {
int *iptos;
#if defined(__linux__)
if (ipv6_available()) {
int optval = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_FLOWINFO_SEND,
(void *)&optval, sizeof(optval)) < 0) {
return -1;
}
/*
* Let's also set the IPV6_TCLASS flag.
* Linux appears to allow both IP_TOS and IPV6_TCLASS to be set
* This helps in mixed environments where IPv4 and IPv6 sockets
* are connecting.
*/
if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS,
arg, len) < 0) {
return -1;
}
}
#endif
iptos = (int *)arg;
*iptos &= (IPTOS_TOS_MASK | IPTOS_PREC_MASK);
}
/*
* SOL_SOCKET/{SO_SNDBUF,SO_RCVBUF} - On Solaris we may need to clamp
* the value when it exceeds the system limit.
*/
#ifdef __solaris__
if (level == SOL_SOCKET) {
if (opt == SO_SNDBUF || opt == SO_RCVBUF) {
int sotype=0;
socklen_t arglen;
int *bufsize, maxbuf;
int ret;
/* Attempt with the original size */
ret = setsockopt(fd, level, opt, arg, len);
if ((ret == 0) || (ret == -1 && errno != ENOBUFS))
return ret;
/* Exceeded system limit so clamp and retry */
arglen = sizeof(sotype);
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype,
&arglen) < 0) {
return -1;
}
/*
* We try to get tcp_maxbuf (and udp_max_buf) using
* an ioctl() that isn't available on all versions of Solaris.
* If that fails, we use the search algorithm in findMaxBuf()
*/
if (!init_tcp_max_buf && sotype == SOCK_STREAM) {
tcp_max_buf = net_getParam("/dev/tcp", "tcp_max_buf");
if (tcp_max_buf == -1) {
tcp_max_buf = findMaxBuf(fd, opt, SOCK_STREAM);
if (tcp_max_buf == -1) {
return -1;
}
}
init_tcp_max_buf = 1;
} else if (!init_udp_max_buf && sotype == SOCK_DGRAM) {
udp_max_buf = net_getParam("/dev/udp", "udp_max_buf");
if (udp_max_buf == -1) {
udp_max_buf = findMaxBuf(fd, opt, SOCK_DGRAM);
if (udp_max_buf == -1) {
return -1;
}
}
init_udp_max_buf = 1;
}
maxbuf = (sotype == SOCK_STREAM) ? tcp_max_buf : udp_max_buf;
bufsize = (int *)arg;
if (*bufsize > maxbuf) {
*bufsize = maxbuf;
}
}
}
#endif
#ifdef _AIX
if (level == SOL_SOCKET) {
if (opt == SO_SNDBUF || opt == SO_RCVBUF) {
/*
* Just try to set the requested size. If it fails we will leave the
* socket option as is. Setting the buffer size means only a hint in
* the jse2/java software layer, see javadoc. In the previous
* solution the buffer has always been truncated to a length of
* 0x100000 Byte, even if the technical limit has not been reached.
* This kind of absolute truncation was unexpected in the jck tests.
*/
int ret = setsockopt(fd, level, opt, arg, len);
if ((ret == 0) || (ret == -1 && errno == ENOBUFS)) {
// Accept failure because of insufficient buffer memory resources.
return 0;
} else {
// Deliver all other kinds of errors.
return ret;
}
}
}
#endif
/*
* On Linux the receive buffer is used for both socket
* structures and the packet payload. The implication
* is that if SO_RCVBUF is too small then small packets
* must be discarded.
*/
#ifdef __linux__
if (level == SOL_SOCKET && opt == SO_RCVBUF) {
int *bufsize = (int *)arg;
if (*bufsize < 1024) {
*bufsize = 1024;
}
}
#endif
#if defined(_ALLBSD_SOURCE)
/*
* SOL_SOCKET/{SO_SNDBUF,SO_RCVBUF} - On FreeBSD need to
* ensure that value is <= kern.ipc.maxsockbuf as otherwise we get
* an ENOBUFS error.
*/
if (level == SOL_SOCKET) {
if (opt == SO_SNDBUF || opt == SO_RCVBUF) {
#ifdef KIPC_MAXSOCKBUF
if (maxsockbuf == -1) {
mib[0] = CTL_KERN;
mib[1] = KERN_IPC;
mib[2] = KIPC_MAXSOCKBUF;
rlen = sizeof(maxsockbuf);
if (sysctl(mib, 3, &maxsockbuf, &rlen, NULL, 0) == -1)
maxsockbuf = 1024;
#if 1
/* XXXBSD: This is a hack to workaround mb_max/mb_max_adj
problem. It should be removed when kern.ipc.maxsockbuf
will be real value. */
maxsockbuf = (maxsockbuf/5)*4;
#endif
}
#elif defined(__OpenBSD__)
maxsockbuf = SB_MAX;
#else
maxsockbuf = 64 * 1024; /* XXX: NetBSD */
#endif
bufsize = (int *)arg;
if (*bufsize > maxsockbuf) {
*bufsize = maxsockbuf;
}
if (opt == SO_RCVBUF && *bufsize < 1024) {
*bufsize = 1024;
}
}
}
#endif
#if defined(_ALLBSD_SOURCE) || defined(_AIX)
/*
* On Solaris, SO_REUSEADDR will allow multiple datagram
* sockets to bind to the same port. The network jck tests check
* for this "feature", so we need to emulate it by turning on
* SO_REUSEPORT as well for that combination.
*/
if (level == SOL_SOCKET && opt == SO_REUSEADDR) {
int sotype;
socklen_t arglen;
arglen = sizeof(sotype);
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen) < 0) {
return -1;
}
if (sotype == SOCK_DGRAM) {
setsockopt(fd, level, SO_REUSEPORT, arg, len);
}
}
#endif
return setsockopt(fd, level, opt, arg, len);
}
/*
* Wrapper for bind system call - performs any necessary pre/post
* processing to deal with OS specific issues :-
*
* Linux allows a socket to bind to 127.0.0.255 which must be
* caught.
*
* On Solaris with IPv6 enabled we must use an exclusive
* bind to guarantee a unique port number across the IPv4 and
* IPv6 port spaces.
*
*/
int
NET_Bind(int fd, SOCKETADDRESS *sa, int len)
{
#if defined(__solaris__)
int level = -1;
int exclbind = -1;
#endif
int rv;
int arg, alen;
#ifdef __linux__
/*
* ## get bugId for this issue - goes back to 1.2.2 port ##
* ## When IPv6 is enabled this will be an IPv4-mapped
* ## with family set to AF_INET6
*/
if (sa->sa.sa_family == AF_INET) {
if ((ntohl(sa->sa4.sin_addr.s_addr) & 0x7f0000ff) == 0x7f0000ff) {
errno = EADDRNOTAVAIL;
return -1;
}
}
#endif
#if defined(__solaris__)
/*
* Solaris has separate IPv4 and IPv6 port spaces so we
* use an exclusive bind when SO_REUSEADDR is not used to
* give the illusion of a unified port space.
* This also avoids problems with IPv6 sockets connecting
* to IPv4 mapped addresses whereby the socket conversion
* results in a late bind that fails because the
* corresponding IPv4 port is in use.
*/
alen = sizeof(arg);
if (useExclBind ||
getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&arg, &alen) == 0)
{
if (useExclBind || arg == 0) {
/*
* SO_REUSEADDR is disabled or sun.net.useExclusiveBind
* property is true so enable TCP_EXCLBIND or
* UDP_EXCLBIND
*/
alen = sizeof(arg);
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&arg, &alen) == 0)
{
if (arg == SOCK_STREAM) {
level = IPPROTO_TCP;
exclbind = TCP_EXCLBIND;
} else {
level = IPPROTO_UDP;
exclbind = UDP_EXCLBIND;
}
}
arg = 1;
setsockopt(fd, level, exclbind, (char *)&arg, sizeof(arg));
}
}
#endif
rv = bind(fd, &sa->sa, len);
#if defined(__solaris__)
if (rv < 0) {
int en = errno;
/* Restore *_EXCLBIND if the bind fails */
if (exclbind != -1) {
int arg = 0;
setsockopt(fd, level, exclbind, (char *)&arg,
sizeof(arg));
}
errno = en;
}
#endif
return rv;
}
/**
* Wrapper for poll with timeout on a single file descriptor.
*
* flags (defined in net_util_md.h can be any combination of
* NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT.
*
* The function will return when either the socket is ready for one
* of the specified operations or the timeout expired.
*
* It returns the time left from the timeout (possibly 0), or -1 if it expired.
*/
jint
NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
{
jlong prevNanoTime = JVM_NanoTime(env, 0);
jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;
jint read_rv;
while (1) {
jlong newNanoTime;
struct pollfd pfd;
pfd.fd = fd;
pfd.events = 0;
if (flags & NET_WAIT_READ)
pfd.events |= POLLIN;
if (flags & NET_WAIT_WRITE)
pfd.events |= POLLOUT;
if (flags & NET_WAIT_CONNECT)
pfd.events |= POLLOUT;
errno = 0;
read_rv = NET_Poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
newNanoTime = JVM_NanoTime(env, 0);
nanoTimeout -= (newNanoTime - prevNanoTime);
if (nanoTimeout < NET_NSEC_PER_MSEC) {
return read_rv > 0 ? 0 : -1;
}
prevNanoTime = newNanoTime;
if (read_rv > 0) {
break;
}
} /* while */
return (nanoTimeout / NET_NSEC_PER_MSEC);
}
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