Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:41228 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751549AbcJGKFR (ORCPT ); Fri, 7 Oct 2016 06:05:17 -0400 From: Stefan Hajnoczi To: linux-nfs@vger.kernel.org Cc: Anna Schumaker , "J. Bruce Fields" , Trond Myklebust , Stefan Hajnoczi Subject: [PATCH v2 01/10] SUNRPC: add AF_VSOCK support to addr.[ch] Date: Fri, 7 Oct 2016 11:01:45 +0100 Message-Id: <1475834514-4058-2-git-send-email-stefanha@redhat.com> In-Reply-To: <1475834514-4058-1-git-send-email-stefanha@redhat.com> References: <1475834514-4058-1-git-send-email-stefanha@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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 --- v2: * Replace CONFIG_VSOCKETS with CONFIG_SUNRPC_XPRT_VSOCK to prevent build failures when SUNRPC=y and VSOCKETS=m. Built-in code cannot link against code in a module. --- include/linux/sunrpc/addr.h | 44 ++++++++++++++++++++++++++++++++++ net/sunrpc/Kconfig | 10 ++++++++ net/sunrpc/addr.c | 57 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 111 insertions(+) diff --git a/include/linux/sunrpc/addr.h b/include/linux/sunrpc/addr.h index 5c9c6cd..c4169bc 100644 --- a/include/linux/sunrpc/addr.h +++ b/include/linux/sunrpc/addr.h @@ -10,6 +10,7 @@ #include #include #include +#include #include 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; } } @@ -106,6 +112,40 @@ static inline bool __rpc_copy_addr6(struct sockaddr *dst, } #endif /* !(IS_ENABLED(CONFIG_IPV6) */ +#if IS_ENABLED(CONFIG_VSOCKETS) +static inline bool rpc_cmp_vsock_addr(const struct sockaddr *sap1, + const struct sockaddr *sap2) +{ + const struct sockaddr_vm *svm1 = (const struct sockaddr_vm *)sap1; + const struct sockaddr_vm *svm2 = (const struct sockaddr_vm *)sap2; + + return svm1->svm_cid == svm2->svm_cid; +} + +static inline bool __rpc_copy_vsock_addr(struct sockaddr *dst, + const struct sockaddr *src) +{ + const struct sockaddr_vm *ssvm = (const struct sockaddr_vm *)src; + struct sockaddr_vm *dsvm = (struct sockaddr_vm *)dst; + + dsvm->svm_family = ssvm->svm_family; + dsvm->svm_cid = ssvm->svm_cid; + return true; +} +#else /* !(IS_ENABLED(CONFIG_VSOCKETS) */ +static inline bool rpc_cmp_vsock_addr(const struct sockaddr *sap1, + const struct sockaddr *sap2) +{ + return false; +} + +static inline bool __rpc_copy_vsock_addr(struct sockaddr *dst, + const struct sockaddr *src) +{ + return false; +} +#endif /* !(IS_ENABLED(CONFIG_VSOCKETS) */ + /** * rpc_cmp_addr - compare the address portion of two sockaddrs. * @sap1: first sockaddr @@ -125,6 +165,8 @@ static inline bool rpc_cmp_addr(const struct sockaddr *sap1, return rpc_cmp_addr4(sap1, sap2); case AF_INET6: return rpc_cmp_addr6(sap1, sap2); + case AF_VSOCK: + return rpc_cmp_vsock_addr(sap1, sap2); } } return false; @@ -161,6 +203,8 @@ static inline bool rpc_copy_addr(struct sockaddr *dst, return __rpc_copy_addr4(dst, src); case AF_INET6: return __rpc_copy_addr6(dst, src); + case AF_VSOCK: + return __rpc_copy_vsock_addr(dst, src); } return false; } diff --git a/net/sunrpc/Kconfig b/net/sunrpc/Kconfig index 04ce2c0..d18fc1a 100644 --- a/net/sunrpc/Kconfig +++ b/net/sunrpc/Kconfig @@ -61,3 +61,13 @@ config SUNRPC_XPRT_RDMA If unsure, or you know there is no RDMA capability on your hardware platform, say N. + +config SUNRPC_XPRT_VSOCK + bool "RPC-over-AF_VSOCK transport" + depends on SUNRPC && VSOCKETS && !(SUNRPC=y && VSOCKETS=m) + default SUNRPC && VSOCKETS + help + This option allows the NFS client and server to use the AF_VSOCK + transport to communicate between virtual machines and the host. + + If unsure, say Y. diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c index 2e0a6f9..f4dd962 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 #include #include #include #include +#include #if IS_ENABLED(CONFIG_IPV6) @@ -108,6 +111,26 @@ static size_t rpc_ntop6(const struct sockaddr *sap, #endif /* !IS_ENABLED(CONFIG_IPV6) */ +#ifdef CONFIG_SUNRPC_XPRT_VSOCK + +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 /* !CONFIG_SUNRPC_XPRT_VSOCK */ + +static size_t rpc_ntop_vsock(const struct sockaddr *sap, + char *buf, const size_t buflen) +{ + return 0; +} + +#endif /* !CONFIG_SUNRPC_XPRT_VSOCK */ + 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 +#ifdef CONFIG_SUNRPC_XPRT_VSOCK +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); -- 2.7.4