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[RFC PATCH 5/5] sockets: Support multipath TCP
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[RFC PATCH 5/5] sockets: Support multipath TCP |
Date: |
Thu, 8 Apr 2021 20:11:59 +0100 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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>
---
io/dns-resolver.c | 2 ++
qapi/sockets.json | 5 ++++-
util/qemu-sockets.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 40 insertions(+), 1 deletion(-)
diff --git a/io/dns-resolver.c b/io/dns-resolver.c
index 743a0efc87..b081e098bb 100644
--- a/io/dns-resolver.c
+++ b/io/dns-resolver.c
@@ -122,6 +122,8 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSResolver
*resolver,
.ipv4 = iaddr->ipv4,
.has_ipv6 = iaddr->has_ipv6,
.ipv6 = iaddr->ipv6,
+ .has_mptcp = iaddr->has_mptcp,
+ .mptcp = iaddr->mptcp,
};
(*addrs)[i] = newaddr;
diff --git a/qapi/sockets.json b/qapi/sockets.json
index 2e83452797..43122a38bf 100644
--- a/qapi/sockets.json
+++ b/qapi/sockets.json
@@ -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 6.0)
+#
# Since: 1.3
##
{ 'struct': 'InetSocketAddress',
@@ -66,7 +68,8 @@
'*to': 'uint16',
'*ipv4': 'bool',
'*ipv6': 'bool',
- '*keep-alive': 'bool' } }
+ '*keep-alive': 'bool',
+ '*mptcp': 'bool' } }
##
# @UnixSocketAddress:
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 8af0278f15..72527972d5 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -206,6 +206,21 @@ static int try_bind(int socket, InetSocketAddress *saddr,
struct addrinfo *e)
#endif
}
+static int check_mptcp(const InetSocketAddress *saddr, struct addrinfo *ai,
+ Error **errp)
+{
+ if (saddr->has_mptcp && saddr->mptcp) {
+#ifdef IPPROTO_MPTCP
+ ai->ai_protocol = IPPROTO_MPTCP;
+#else
+ error_setg(errp, "MPTCP unavailable in this build");
+ return -1;
+#endif
+ }
+
+ return 0;
+}
+
static int inet_listen_saddr(InetSocketAddress *saddr,
int port_offset,
int num,
@@ -278,6 +293,11 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
/* create socket + bind/listen */
for (e = res; e != NULL; e = e->ai_next) {
+ if (check_mptcp(saddr, e, &err)) {
+ error_propagate(errp, err);
+ return -1;
+ }
+
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
@@ -456,6 +476,11 @@ int inet_connect_saddr(InetSocketAddress *saddr, Error
**errp)
for (e = res; e != NULL; e = e->ai_next) {
error_free(local_err);
local_err = NULL;
+
+ if (check_mptcp(saddr, e, &local_err)) {
+ break;
+ }
+
sock = inet_connect_addr(saddr, e, &local_err);
if (sock >= 0) {
break;
@@ -687,6 +712,15 @@ int inet_parse(InetSocketAddress *addr, const char *str,
Error **errp)
}
addr->has_keep_alive = true;
}
+ begin = strstr(optstr, ",mptcp");
+ if (begin) {
+ if (inet_parse_flag("mptcp", begin + strlen(",mptcp"),
+ &addr->mptcp, errp) < 0)
+ {
+ return -1;
+ }
+ addr->has_mptcp = true;
+ }
return 0;
}
--
2.31.1
- [RFC PATCH 0/5] mptcp support, Dr. David Alan Gilbert (git), 2021/04/08
- [RFC PATCH 1/5] channel-socket: Only set CLOEXEC if we have space for fds, Dr. David Alan Gilbert (git), 2021/04/08
- [RFC PATCH 3/5] migration: Add cleanup hook for inwards migration, Dr. David Alan Gilbert (git), 2021/04/08
- [RFC PATCH 4/5] migration/socket: Close the listener at the end, Dr. David Alan Gilbert (git), 2021/04/08
- [RFC PATCH 5/5] sockets: Support multipath TCP,
Dr. David Alan Gilbert (git) <=
- [RFC PATCH 2/5] io/net-listener: Call the notifier during finalize, Dr. David Alan Gilbert (git), 2021/04/08
- Re: [RFC PATCH 0/5] mptcp support, Daniel P . Berrangé, 2021/04/09