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8241800: Disable IPV6_MULTICAST_ALL to prevent interference from all multicast groups

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Reviewed-by: alanb
This commit is contained in:
Michael McMahon 2023-06-19 21:35:58 +00:00
parent 137a5f7c2c
commit 7b45c8fc3a
3 changed files with 60 additions and 35 deletions
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17
src/java.base/unix/native/libnio/ch/Net.c
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@ -49,11 +49,15 @@
/**
* IP_MULTICAST_ALL supported since 2.6.31 but may not be available at
* build time.
* IPV6_MULTICAST_ALL supported since 4.20
*/
#ifdef __linux__
#ifndef IP_MULTICAST_ALL
#define IP_MULTICAST_ALL 49
#endif
#ifndef IPV6_MULTICAST_ALL
#define IPV6_MULTICAST_ALL 29
#endif
#endif
/**
@ -297,8 +301,8 @@ Java_sun_nio_ch_Net_socket0(JNIEnv *env, jclass cl, jboolean preferIPv6,
}
}
/* By default, Linux uses the route default */
if (domain == AF_INET6 && type == SOCK_DGRAM) {
/* By default, Linux uses the route default */
int arg = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &arg,
sizeof(arg)) < 0) {
@ -308,6 +312,17 @@ Java_sun_nio_ch_Net_socket0(JNIEnv *env, jclass cl, jboolean preferIPv6,
close(fd);
return -1;
}
/* Disable IPV6_MULTICAST_ALL if option supported */
arg = 0;
if ((setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_ALL, (char*)&arg, sizeof(arg)) < 0) &&
(errno != ENOPROTOOPT)) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"Unable to set IPV6_MULTICAST_ALL");
close(fd);
return -1;
}
}
#endif