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sockets: Support multipath TCP

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Multipath TCP allows combining multiple interfaces/routes into a single
socket, with very little work for the user/admin.

It's enabled by 'mptcp' on most socket addresses:

   ./qemu-system-x86_64 -nographic -incoming tcp:0:4444,mptcp

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210421112834.107651-6-dgilbert@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2021-04-21 12:28:34 +01:00
parent a59136f3b1
commit 8bd1078aeb
3 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
io/dns-resolver.c
View File

@ -122,6 +122,10 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSResolver *resolver,
.ipv4 = iaddr->ipv4,
.has_ipv6 = iaddr->has_ipv6,
.ipv6 = iaddr->ipv6,
#ifdef IPPROTO_MPTCP
.has_mptcp = iaddr->has_mptcp,
.mptcp = iaddr->mptcp,
#endif
};
(*addrs)[i] = newaddr;

5
qapi/sockets.json
View File

@ -57,6 +57,8 @@
# @keep-alive: enable keep-alive when connecting to this socket. Not supported
# for passive sockets. (Since 4.2)
#
# @mptcp: enable multi-path TCP. (Since 6.1)
#
# Since: 1.3
##
{ 'struct': 'InetSocketAddress',
@ -66,7 +68,8 @@
'*to': 'uint16',
'*ipv4': 'bool',
'*ipv6': 'bool',
'*keep-alive': 'bool' } }
'*keep-alive': 'bool',
'*mptcp': { 'type': 'bool', 'if': 'defined(IPPROTO_MPTCP)' } } }
##
# @UnixSocketAddress:

23
util/qemu-sockets.c
View File

@ -278,6 +278,11 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
/* create socket + bind/listen */
for (e = res; e != NULL; e = e->ai_next) {
#ifdef IPPROTO_MPTCP
if (saddr->has_mptcp && saddr->mptcp) {
e->ai_protocol = IPPROTO_MPTCP;
}
#endif
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
@ -456,6 +461,13 @@ int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
for (e = res; e != NULL; e = e->ai_next) {
error_free(local_err);
local_err = NULL;
#ifdef IPPROTO_MPTCP
if (saddr->has_mptcp && saddr->mptcp) {
e->ai_protocol = IPPROTO_MPTCP;
}
#endif
sock = inet_connect_addr(saddr, e, &local_err);
if (sock >= 0) {
break;
@ -687,6 +699,17 @@ int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
}
addr->has_keep_alive = true;
}
#ifdef IPPROTO_MPTCP
begin = strstr(optstr, ",mptcp");
if (begin) {
if (inet_parse_flag("mptcp", begin + strlen(",mptcp"),
&addr->mptcp, errp) < 0)
{
return -1;
}
addr->has_mptcp = true;
}
#endif
return 0;
}