From: Neng Chen <[email protected]>
Add support for the option IPV6_ADD_MEMBERSHIP of the syscall
setsockopt(). This option controls membership in multicast groups.
Argument is a pointer to a struct ipv6_mreq, which is in turn defined
in a platform-inedependant manner in the Linux kernel file
include/uapi/linux/in6.h as:
The <netinet/in.h> header defines the ipv6_mreq structure, which
includes the following members:
struct in6_addr ipv6mr_multiaddr /* IPv6 multicast address */
unsigned int ipv6mr_interface /* local interface index */
struct ipv6_mreq {
/* IPv6 multicast address of group */
struct in6_addr ipv6mr_multiaddr;
/* local IPv6 address of interface */
int ipv6mr_ifindex;
};
The <netinet/in.h> header also defines the in6_addr structure,
which a union of the following structure:
struct in6_addr {
union {
__u8 u6_addr8[16];
__be16 u6_addr16[8];
__be32 u6_addr32[4];
} in6_u;
The emulation behavior of IPV6_ADD_MEMBERSHIP is devised based on
the definitions above.
Signed-off-by: Neng Chen <[email protected]>
Signed-off-by: Aleksandar Markovic <[email protected]>
---
linux-user/syscall.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 96cd4bf..b47a45d 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1892,6 +1892,24 @@ static abi_long do_setsockopt(int sockfd, int level, int
optname,
&pki, sizeof(pki)));
break;
}
+ case IPV6_ADD_MEMBERSHIP:
+ {
+ struct ipv6_mreq ipv6mreq;
+
+ if (optlen < sizeof(ipv6mreq)) {
+ return -TARGET_EINVAL;
+ }
+
+ if (copy_from_user(&ipv6mreq, optval_addr, sizeof(ipv6mreq))) {
+ return -TARGET_EFAULT;
+ }
+
+ ipv6mreq.ipv6mr_interface = tswap32(ipv6mreq.ipv6mr_interface);
+
+ ret = get_errno(setsockopt(sockfd, level, optname,
+ &ipv6mreq, sizeof(ipv6mreq)));
+ break;
+ }
default:
goto unimplemented;
}
--
2.7.4
