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SUNRPC: Support IPv6 when registering kernel RPC services
In order to advertise NFS-related services on IPv6 interfaces via rpcbind, the kernel RPC server implementation must use rpcb_v4_register() instead of rpcb_register(). A new kernel build option allows distributions to use the legacy v2 call until they integrate an appropriate user-space rpcbind daemon that can support IPv6 RPC services. I tried adding some automatic logic to fall back if registering with a v4 protocol request failed, but there are too many corner cases. So I just made it a compile-time switch that distributions can throw when they've replaced portmapper with rpcbind. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Chuck Lever
J. Bruce Fields
parent
7252d575ab
commit
a26cfad6e0
3 changed files with 113 additions and 8 deletions
22
fs/Kconfig
22
fs/Kconfig
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@ -1773,6 +1773,28 @@ config SUNRPC_XPRT_RDMA
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If unsure, say N.
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config SUNRPC_REGISTER_V4
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bool "Register local RPC services via rpcbind v4 (EXPERIMENTAL)"
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depends on SUNRPC && EXPERIMENTAL
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default n
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help
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Sun added support for registering RPC services at an IPv6
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address by creating two new versions of the rpcbind protocol
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(RFC 1833).
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This option enables support in the kernel RPC server for
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registering kernel RPC services via version 4 of the rpcbind
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protocol. If you enable this option, you must run a portmapper
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daemon that supports rpcbind protocol version 4.
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Serving NFS over IPv6 from knfsd (the kernel's NFS server)
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requires that you enable this option and use a portmapper that
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supports rpcbind version 4.
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If unsure, say N to get traditional behavior (register kernel
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RPC services using only rpcbind version 2). Distributions
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using the legacy Linux portmapper daemon must say N here.
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config RPCSEC_GSS_KRB5
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tristate "Secure RPC: Kerberos V mechanism (EXPERIMENTAL)"
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depends on SUNRPC && EXPERIMENTAL
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@ -393,7 +393,9 @@ struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int,
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int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
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void svc_destroy(struct svc_serv *);
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int svc_process(struct svc_rqst *);
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int svc_register(struct svc_serv *, int, unsigned short);
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int svc_register(const struct svc_serv *, const unsigned short,
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const unsigned short);
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void svc_wake_up(struct svc_serv *);
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void svc_reserve(struct svc_rqst *rqstp, int space);
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struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu);
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@ -719,13 +719,92 @@ svc_exit_thread(struct svc_rqst *rqstp)
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}
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EXPORT_SYMBOL(svc_exit_thread);
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#ifdef CONFIG_SUNRPC_REGISTER_V4
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/*
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* Register an RPC service with the local portmapper.
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* To unregister a service, call this routine with
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* proto and port == 0.
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* Registering kernel RPC services with rpcbind version 2 will work
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* over either IPv4 or IPv6, since the Linux kernel always registers
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* services for the "any" address.
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*
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* However, the local rpcbind daemon listens on either only AF_INET
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* or AF_INET6 (never both). When it listens on AF_INET6, an rpcbind
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* version 2 registration will result in registering the service at
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* IN6ADDR_ANY, even if the RPC service being registered is not
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* IPv6-enabled.
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*
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* Rpcbind version 4 allows us to be a little more specific. Kernel
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* RPC services that don't yet support AF_INET6 can register
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* themselves as IPv4-only with the local rpcbind daemon, even if the
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* daemon is listening only on AF_INET6.
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*
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* And, registering IPv6-enabled kernel RPC services via AF_INET6
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* verifies that the local user space rpcbind daemon is properly
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* configured to support remote AF_INET6 rpcbind requests.
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*
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* An AF_INET6 registration request will fail if the local rpcbind
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* daemon is not set up to listen on AF_INET6. Likewise, we fail
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* AF_INET6 registration requests if svc_register() is configured to
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* support only rpcbind version 2.
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*/
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int
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svc_register(struct svc_serv *serv, int proto, unsigned short port)
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static int __svc_register(const u32 program, const u32 version,
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const sa_family_t family,
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const unsigned short protocol,
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const unsigned short port)
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{
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_ANY),
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.sin_port = htons(port),
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};
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struct sockaddr_in6 sin6 = {
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.sin6_family = AF_INET6,
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.sin6_addr = IN6ADDR_ANY_INIT,
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.sin6_port = htons(port),
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};
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struct sockaddr *sap;
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char *netid;
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switch (family) {
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case AF_INET:
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sap = (struct sockaddr *)&sin;
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netid = RPCBIND_NETID_TCP;
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if (protocol == IPPROTO_UDP)
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netid = RPCBIND_NETID_UDP;
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break;
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case AF_INET6:
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sap = (struct sockaddr *)&sin6;
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netid = RPCBIND_NETID_TCP6;
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if (protocol == IPPROTO_UDP)
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netid = RPCBIND_NETID_UDP6;
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break;
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default:
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return -EAFNOSUPPORT;
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}
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return rpcb_v4_register(program, version, sap, netid);
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}
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#else
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static int __svc_register(const u32 program, const u32 version,
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sa_family_t family,
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const unsigned short protocol,
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const unsigned short port)
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{
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if (family != AF_INET)
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return -EAFNOSUPPORT;
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return rpcb_register(program, version, protocol, port);
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}
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#endif
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/**
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* svc_register - register an RPC service with the local portmapper
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* @serv: svc_serv struct for the service to register
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* @proto: transport protocol number to advertise
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* @port: port to advertise
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*
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* Service is registered for any address in serv's address family
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*/
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int svc_register(const struct svc_serv *serv, const unsigned short proto,
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const unsigned short port)
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{
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struct svc_program *progp;
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unsigned int i;
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@ -738,8 +817,9 @@ svc_register(struct svc_serv *serv, int proto, unsigned short port)
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if (progp->pg_vers[i] == NULL)
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continue;
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dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
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dprintk("svc: svc_register(%s, %u, %s, %u, %d)%s\n",
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progp->pg_name,
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serv->sv_family,
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proto == IPPROTO_UDP? "udp" : "tcp",
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port,
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i,
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@ -749,7 +829,8 @@ svc_register(struct svc_serv *serv, int proto, unsigned short port)
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if (progp->pg_vers[i]->vs_hidden)
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continue;
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error = rpcb_register(progp->pg_prog, i, proto, port);
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error = __svc_register(progp->pg_prog, i,
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serv->sv_family, proto, port);
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if (error < 0)
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break;
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}
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