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sockets: add AF_VSOCK support

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Add the AF_VSOCK address family so that qemu-ga will be able to use
virtio-vsock.

The AF_VSOCK address family uses <cid, port> address tuples.  The cid is
the unique identifier comparable to an IP address.  AF_VSOCK does not
use name resolution so it's easy to convert between struct sockaddr_vm
and strings.

This patch defines a VsockSocketAddress instead of trying to piggy-back
on InetSocketAddress.  This is cleaner in the long run since it avoids
lots of IPv4 vs IPv6 vs vsock special casing.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* treat trailing commas as garbage when parsing (Eric Blake)
* add configure check instead of checking AF_VSOCK directly
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2016-10-14 10:00:55 +01:00 • committed by Michael Roth
parent f06b2031a3
commit 6a02c8069f
3 changed files with 280 additions and 1 deletions
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31
configure vendored
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@ -4674,6 +4674,33 @@ if compile_prog "" "" ; then
have_rtnetlink=yes
fi
##########################################
# check for usable AF_VSOCK environment
have_af_vsock=no
cat > $TMPC << EOF
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#if !defined(AF_VSOCK)
# error missing AF_VSOCK flag
#endif
#include <linux/vm_sockets.h>
int main(void) {
int sock, ret;
struct sockaddr_vm svm;
socklen_t len = sizeof(svm);
sock = socket(AF_VSOCK, SOCK_STREAM, 0);
ret = getpeername(sock, (struct sockaddr *)&svm, &len);
if ((ret == -1) && (errno == ENOTCONN)) {
return 0;
}
return -1;
}
EOF
if compile_prog "" "" ; then
have_af_vsock=yes
fi
#################################################
# Sparc implicitly links with --relax, which is
# incompatible with -r, so --no-relax should be
@ -5662,6 +5689,10 @@ if test "$replication" = "yes" ; then
echo "CONFIG_REPLICATION=y" >> $config_host_mak
fi
if test "$have_af_vsock" = "yes" ; then
echo "CONFIG_AF_VSOCK=y" >> $config_host_mak
fi
# Hold two types of flag:
# CONFIG_THREAD_SETNAME_BYTHREAD - we've got a way of setting the name on
# a thread we have a handle to