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[Qemu-devel] [PATCH v12 1/5] linux-user: Add support for setsockopt() op
From: |
Aleksandar Markovic |
Subject: |
[Qemu-devel] [PATCH v12 1/5] linux-user: Add support for setsockopt() options IPV6_<ADD|DROP>_MEMBERSHIP |
Date: |
Wed, 19 Jun 2019 16:17:10 +0200 |
From: Neng Chen <address@hidden>
Add support for the option IPV6_<ADD|DROP>_MEMBERSHIP of the syscall
setsockopt(). This option controls membership in multicast groups.
Argument is a pointer to a struct ipv6_mreq.
The glibc <netinet/in.h> header defines the ipv6_mreq structure,
which includes the following members:
struct in6_addr ipv6mr_multiaddr;
unsigned int ipv6mr_interface;
Whereas the kernel in its <linux/in6.h> header defines following
members of the same structure:
struct in6_addr ipv6mr_multiaddr;
int ipv6mr_ifindex;
POSIX defines ipv6mr_interface [1].
__UAPI_DEF_IVP6_MREQ appears in kernel headers with v3.12:
cfd280c91253 net: sync some IP headers with glibc
Without __UAPI_DEF_IVP6_MREQ, kernel defines ipv6mr_ifindex, and
this is explained in cfd280c91253:
"If you include the kernel headers first you get those,
and if you include the glibc headers first you get those,
and the following patch arranges a coordination and
synchronization between the two."
So before 3.12, a program can't include both <netinet/in.h> and
<linux/in6.h>.
In linux-user/syscall.c, we only include <netinet/in.h> (glibc) and
not <linux/in6.h> (kernel headers), so ipv6mr_interface is the one
to use.
[1] http://pubs.opengroup.org/onlinepubs/009695399/basedefs/netinet/in.h.html
Signed-off-by: Neng Chen <address@hidden>
Signed-off-by: Aleksandar Markovic <address@hidden>
---
linux-user/syscall.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b187c12..f267ad0 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1920,6 +1920,25 @@ static abi_long do_setsockopt(int sockfd, int level, int
optname,
&pki, sizeof(pki)));
break;
}
+ case IPV6_ADD_MEMBERSHIP:
+ case IPV6_DROP_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