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Date: Thu, 4 Jun 2015 17:45:44 +0100
From: Stefan Hajnoczi <stefanha@...hat.com>
To: linux-nfs@...r.kernel.org
Cc: Anna Schumaker <anna.schumaker@...app.com>,
"J. Bruce Fields" <bfields@...ldses.org>,
Trond Myklebust <trond.myklebust@...marydata.com>,
asias.hejun@...il.com, netdev@...r.kernel.org,
Daniel Berrange <berrange@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Stefan Hajnoczi <stefanha@...hat.com>
Subject: [RFC 01/10] SUNRPC: add AF_VSOCK support to addr.h
AF_VSOCK addresses are a Context ID (CID) and port number tuple. The
CID is a unique address, similar to a IP address on a local subnet.
Extend the addr.h functions to handle AF_VSOCK addresses.
Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
---
include/linux/sunrpc/addr.h | 6 +++++
net/sunrpc/addr.c | 57 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)
diff --git a/include/linux/sunrpc/addr.h b/include/linux/sunrpc/addr.h
index 07d8e53..b6530de 100644
--- a/include/linux/sunrpc/addr.h
+++ b/include/linux/sunrpc/addr.h
@@ -10,6 +10,7 @@
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
+#include <linux/vm_sockets.h>
#include <net/ipv6.h>
size_t rpc_ntop(const struct sockaddr *, char *, const size_t);
@@ -26,6 +27,8 @@ static inline unsigned short rpc_get_port(const struct sockaddr *sap)
return ntohs(((struct sockaddr_in *)sap)->sin_port);
case AF_INET6:
return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
+ case AF_VSOCK:
+ return ((struct sockaddr_vm *)sap)->svm_port;
}
return 0;
}
@@ -40,6 +43,9 @@ static inline void rpc_set_port(struct sockaddr *sap,
case AF_INET6:
((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
break;
+ case AF_VSOCK:
+ ((struct sockaddr_vm *)sap)->svm_port = port;
+ break;
}
}
diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c
index 2e0a6f9..fe6eb31 100644
--- a/net/sunrpc/addr.c
+++ b/net/sunrpc/addr.c
@@ -16,11 +16,14 @@
* RFC 4291, Section 2.2 for details on IPv6 presentation formats.
*/
+ /* TODO register netid and uaddr with IANA? (See RFC 5665 5.1/5.2) */
+
#include <net/ipv6.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/slab.h>
#include <linux/export.h>
+#include <linux/vm_sockets.h>
#if IS_ENABLED(CONFIG_IPV6)
@@ -108,6 +111,26 @@ static size_t rpc_ntop6(const struct sockaddr *sap,
#endif /* !IS_ENABLED(CONFIG_IPV6) */
+#if IS_ENABLED(CONFIG_VSOCKETS)
+
+static size_t rpc_ntop_vsock(const struct sockaddr *sap,
+ char *buf, const size_t buflen)
+{
+ const struct sockaddr_vm *svm = (struct sockaddr_vm *)sap;
+
+ return snprintf(buf, buflen, "%u", svm->svm_cid);
+}
+
+#else /* !IS_ENABLED(CONFIG_VSOCKETS) */
+
+static size_t rpc_ntop_vsock(const struct sockaddr *sap,
+ char *buf, const size_t buflen)
+{
+ return 0;
+}
+
+#endif /* !IS_ENABLED(CONFIG_VSOCKETS) */
+
static int rpc_ntop4(const struct sockaddr *sap,
char *buf, const size_t buflen)
{
@@ -132,6 +155,8 @@ size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
return rpc_ntop4(sap, buf, buflen);
case AF_INET6:
return rpc_ntop6(sap, buf, buflen);
+ case AF_VSOCK:
+ return rpc_ntop_vsock(sap, buf, buflen);
}
return 0;
@@ -229,6 +254,34 @@ static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
}
#endif
+#if IS_ENABLED(CONFIG_VSOCKETS)
+static size_t rpc_pton_vsock(const char *buf, const size_t buflen,
+ struct sockaddr *sap, const size_t salen)
+{
+ const size_t prefix_len = strlen("vsock:");
+ struct sockaddr_vm *svm = (struct sockaddr_vm *)sap;
+ unsigned int cid;
+
+ if (strncmp(buf, "vsock:", prefix_len) != 0 ||
+ salen < sizeof(struct sockaddr_vm))
+ return 0;
+
+ if (kstrtouint(buf + prefix_len, 10, &cid) != 0)
+ return 0;
+
+ memset(svm, 0, sizeof(struct sockaddr_vm));
+ svm->svm_family = AF_VSOCK;
+ svm->svm_cid = cid;
+ return sizeof(struct sockaddr_vm);
+}
+#else
+static size_t rpc_pton_vsock(const char *buf, const size_t buflen,
+ struct sockaddr *sap, const size_t salen)
+{
+ return 0;
+}
+#endif
+
/**
* rpc_pton - Construct a sockaddr in @sap
* @net: applicable network namespace
@@ -249,6 +302,10 @@ size_t rpc_pton(struct net *net, const char *buf, const size_t buflen,
{
unsigned int i;
+ /* TODO is there a nicer way to distinguish vsock addresses? */
+ if (strncmp(buf, "vsock:", 6) == 0)
+ return rpc_pton_vsock(buf, buflen, sap, salen);
+
for (i = 0; i < buflen; i++)
if (buf[i] == ':')
return rpc_pton6(net, buf, buflen, sap, salen);
--
2.4.2
--
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