#include <linux/sunrpc/svcsock.h>
#include <linux/nfs_fs.h>
#include <linux/mutex.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#if defined(CONFIG_NFS_V4_1)
+#include <linux/sunrpc/bc_xprt.h>
+#endif
#include <net/inet_sock.h>
#include "nfs4_fs.h"
#include "callback.h"
+#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_CALLBACK
struct nfs_callback_data {
unsigned int users;
struct svc_serv *serv;
- pid_t pid;
- struct completion started;
- struct completion stopped;
+ struct svc_rqst *rqst;
+ struct task_struct *task;
};
-static struct nfs_callback_data nfs_callback_info;
+static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
static DEFINE_MUTEX(nfs_callback_mutex);
static struct svc_program nfs4_callback_program;
unsigned int nfs_callback_set_tcpport;
unsigned short nfs_callback_tcpport;
+unsigned short nfs_callback_tcpport6;
+#define NFS_CALLBACK_MAXPORTNR (65535U)
-/*
- * This is the callback kernel thread.
- */
-static void nfs_callback_svc(struct svc_rqst *rqstp)
+static int param_set_portnr(const char *val, struct kernel_param *kp)
{
- struct svc_serv *serv = rqstp->rq_server;
- int err;
+ unsigned long num;
+ int ret;
- __module_get(THIS_MODULE);
- lock_kernel();
+ if (!val)
+ return -EINVAL;
+ ret = strict_strtoul(val, 0, &num);
+ if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
+ return -EINVAL;
+ *((unsigned int *)kp->arg) = num;
+ return 0;
+}
+
+static int param_get_portnr(char *buffer, struct kernel_param *kp)
+{
+ return param_get_uint(buffer, kp);
+}
+#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
- nfs_callback_info.pid = current->pid;
- daemonize("nfsv4-svc");
- /* Process request with signals blocked, but allow SIGKILL. */
- allow_signal(SIGKILL);
+module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
- complete(&nfs_callback_info.started);
+/*
+ * This is the NFSv4 callback kernel thread.
+ */
+static int
+nfs4_callback_svc(void *vrqstp)
+{
+ int err, preverr = 0;
+ struct svc_rqst *rqstp = vrqstp;
- for(;;) {
- if (signalled()) {
- if (nfs_callback_info.users == 0)
- break;
- flush_signals(current);
- }
+ set_freezable();
+
+ /*
+ * FIXME: do we really need to run this under the BKL? If so, please
+ * add a comment about what it's intended to protect.
+ */
+ lock_kernel();
+ while (!kthread_should_stop()) {
/*
* Listen for a request on the socket
*/
- err = svc_recv(serv, rqstp, MAX_SCHEDULE_TIMEOUT);
- if (err == -EAGAIN || err == -EINTR)
+ err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
+ if (err == -EAGAIN || err == -EINTR) {
+ preverr = err;
continue;
+ }
if (err < 0) {
- printk(KERN_WARNING
- "%s: terminating on error %d\n",
- __FUNCTION__, -err);
- break;
+ if (err != preverr) {
+ printk(KERN_WARNING "%s: unexpected error "
+ "from svc_recv (%d)\n", __func__, err);
+ preverr = err;
+ }
+ schedule_timeout_uninterruptible(HZ);
+ continue;
}
- dprintk("%s: request from %u.%u.%u.%u\n", __FUNCTION__,
- NIPQUAD(rqstp->rq_addr.sin_addr.s_addr));
- svc_process(serv, rqstp);
+ preverr = err;
+ svc_process(rqstp);
}
+ unlock_kernel();
+ return 0;
+}
+
+/*
+ * Prepare to bring up the NFSv4 callback service
+ */
+struct svc_rqst *
+nfs4_callback_up(struct svc_serv *serv)
+{
+ int ret;
+
+ ret = svc_create_xprt(serv, "tcp", PF_INET,
+ nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
+ if (ret <= 0)
+ goto out_err;
+ nfs_callback_tcpport = ret;
+ dprintk("NFS: Callback listener port = %u (af %u)\n",
+ nfs_callback_tcpport, PF_INET);
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ ret = svc_create_xprt(serv, "tcp", PF_INET6,
+ nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
+ if (ret > 0) {
+ nfs_callback_tcpport6 = ret;
+ dprintk("NFS: Callback listener port = %u (af %u)\n",
+ nfs_callback_tcpport6, PF_INET6);
+ } else if (ret == -EAFNOSUPPORT)
+ ret = 0;
+ else
+ goto out_err;
+#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
+
+ return svc_prepare_thread(serv, &serv->sv_pools[0]);
+
+out_err:
+ if (ret == 0)
+ ret = -ENOMEM;
+ return ERR_PTR(ret);
+}
+
+#if defined(CONFIG_NFS_V4_1)
+/*
+ * The callback service for NFSv4.1 callbacks
+ */
+static int
+nfs41_callback_svc(void *vrqstp)
+{
+ struct svc_rqst *rqstp = vrqstp;
+ struct svc_serv *serv = rqstp->rq_server;
+ struct rpc_rqst *req;
+ int error;
+ DEFINE_WAIT(wq);
- svc_exit_thread(rqstp);
- nfs_callback_info.pid = 0;
- complete(&nfs_callback_info.stopped);
+ set_freezable();
+
+ /*
+ * FIXME: do we really need to run this under the BKL? If so, please
+ * add a comment about what it's intended to protect.
+ */
+ lock_kernel();
+ while (!kthread_should_stop()) {
+ prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
+ spin_lock_bh(&serv->sv_cb_lock);
+ if (!list_empty(&serv->sv_cb_list)) {
+ req = list_first_entry(&serv->sv_cb_list,
+ struct rpc_rqst, rq_bc_list);
+ list_del(&req->rq_bc_list);
+ spin_unlock_bh(&serv->sv_cb_lock);
+ dprintk("Invoking bc_svc_process()\n");
+ error = bc_svc_process(serv, req, rqstp);
+ dprintk("bc_svc_process() returned w/ error code= %d\n",
+ error);
+ } else {
+ spin_unlock_bh(&serv->sv_cb_lock);
+ schedule();
+ }
+ finish_wait(&serv->sv_cb_waitq, &wq);
+ }
unlock_kernel();
- module_put_and_exit(0);
+ return 0;
}
/*
- * Bring up the server process if it is not already up.
+ * Bring up the NFSv4.1 callback service
*/
-int nfs_callback_up(void)
+struct svc_rqst *
+nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
{
- struct svc_serv *serv;
- struct svc_sock *svsk;
+ struct svc_xprt *bc_xprt;
+ struct svc_rqst *rqstp = ERR_PTR(-ENOMEM);
+
+ dprintk("--> %s\n", __func__);
+ /* Create a svc_sock for the service */
+ bc_xprt = svc_sock_create(serv, xprt->prot);
+ if (!bc_xprt)
+ goto out;
+
+ /*
+ * Save the svc_serv in the transport so that it can
+ * be referenced when the session backchannel is initialized
+ */
+ serv->bc_xprt = bc_xprt;
+ xprt->bc_serv = serv;
+
+ INIT_LIST_HEAD(&serv->sv_cb_list);
+ spin_lock_init(&serv->sv_cb_lock);
+ init_waitqueue_head(&serv->sv_cb_waitq);
+ rqstp = svc_prepare_thread(serv, &serv->sv_pools[0]);
+ if (IS_ERR(rqstp))
+ svc_sock_destroy(bc_xprt);
+out:
+ dprintk("--> %s return %p\n", __func__, rqstp);
+ return rqstp;
+}
+
+static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
+ struct svc_serv *serv, struct rpc_xprt *xprt,
+ struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
+{
+ if (minorversion) {
+ *rqstpp = nfs41_callback_up(serv, xprt);
+ *callback_svc = nfs41_callback_svc;
+ }
+ return minorversion;
+}
+
+static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
+ struct nfs_callback_data *cb_info)
+{
+ if (minorversion)
+ xprt->bc_serv = cb_info->serv;
+}
+#else
+static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
+ struct svc_serv *serv, struct rpc_xprt *xprt,
+ struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
+{
+ return 0;
+}
+
+static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
+ struct nfs_callback_data *cb_info)
+{
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+/*
+ * Bring up the callback thread if it is not already up.
+ */
+int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
+{
+ struct svc_serv *serv = NULL;
+ struct svc_rqst *rqstp;
+ int (*callback_svc)(void *vrqstp);
+ struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
+ char svc_name[12];
int ret = 0;
+ int minorversion_setup;
- lock_kernel();
mutex_lock(&nfs_callback_mutex);
- if (nfs_callback_info.users++ || nfs_callback_info.pid != 0)
+ if (cb_info->users++ || cb_info->task != NULL) {
+ nfs_callback_bc_serv(minorversion, xprt, cb_info);
goto out;
- init_completion(&nfs_callback_info.started);
- init_completion(&nfs_callback_info.stopped);
- serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE);
- ret = -ENOMEM;
- if (!serv)
+ }
+ serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
+ if (!serv) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ minorversion_setup = nfs_minorversion_callback_svc_setup(minorversion,
+ serv, xprt, &rqstp, &callback_svc);
+ if (!minorversion_setup) {
+ /* v4.0 callback setup */
+ rqstp = nfs4_callback_up(serv);
+ callback_svc = nfs4_callback_svc;
+ }
+
+ if (IS_ERR(rqstp)) {
+ ret = PTR_ERR(rqstp);
goto out_err;
- /* FIXME: We don't want to register this socket with the portmapper */
- ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport);
- if (ret < 0)
- goto out_destroy;
- if (!list_empty(&serv->sv_permsocks)) {
- svsk = list_entry(serv->sv_permsocks.next,
- struct svc_sock, sk_list);
- nfs_callback_tcpport = ntohs(inet_sk(svsk->sk_sk)->sport);
- dprintk ("Callback port = 0x%x\n", nfs_callback_tcpport);
- } else
- BUG();
- ret = svc_create_thread(nfs_callback_svc, serv);
- if (ret < 0)
- goto out_destroy;
- nfs_callback_info.serv = serv;
- wait_for_completion(&nfs_callback_info.started);
+ }
+
+ svc_sock_update_bufs(serv);
+
+ sprintf(svc_name, "nfsv4.%u-svc", minorversion);
+ cb_info->serv = serv;
+ cb_info->rqst = rqstp;
+ cb_info->task = kthread_run(callback_svc, cb_info->rqst, svc_name);
+ if (IS_ERR(cb_info->task)) {
+ ret = PTR_ERR(cb_info->task);
+ svc_exit_thread(cb_info->rqst);
+ cb_info->rqst = NULL;
+ cb_info->task = NULL;
+ goto out_err;
+ }
out:
+ /*
+ * svc_create creates the svc_serv with sv_nrthreads == 1, and then
+ * svc_prepare_thread increments that. So we need to call svc_destroy
+ * on both success and failure so that the refcount is 1 when the
+ * thread exits.
+ */
+ if (serv)
+ svc_destroy(serv);
mutex_unlock(&nfs_callback_mutex);
- unlock_kernel();
return ret;
-out_destroy:
- svc_destroy(serv);
out_err:
- nfs_callback_info.users--;
+ dprintk("NFS: Couldn't create callback socket or server thread; "
+ "err = %d\n", ret);
+ cb_info->users--;
goto out;
}
/*
- * Kill the server process if it is not already up.
+ * Kill the callback thread if it's no longer being used.
*/
-int nfs_callback_down(void)
+void nfs_callback_down(int minorversion)
{
- int ret = 0;
+ struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
- lock_kernel();
mutex_lock(&nfs_callback_mutex);
- nfs_callback_info.users--;
- do {
- if (nfs_callback_info.users != 0 || nfs_callback_info.pid == 0)
- break;
- if (kill_proc(nfs_callback_info.pid, SIGKILL, 1) < 0)
- break;
- } while (wait_for_completion_timeout(&nfs_callback_info.stopped, 5*HZ) == 0);
+ cb_info->users--;
+ if (cb_info->users == 0 && cb_info->task != NULL) {
+ kthread_stop(cb_info->task);
+ svc_exit_thread(cb_info->rqst);
+ cb_info->serv = NULL;
+ cb_info->rqst = NULL;
+ cb_info->task = NULL;
+ }
mutex_unlock(&nfs_callback_mutex);
- unlock_kernel();
- return ret;
+}
+
+static int check_gss_callback_principal(struct nfs_client *clp,
+ struct svc_rqst *rqstp)
+{
+ struct rpc_clnt *r = clp->cl_rpcclient;
+ char *p = svc_gss_principal(rqstp);
+
+ /*
+ * It might just be a normal user principal, in which case
+ * userspace won't bother to tell us the name at all.
+ */
+ if (p == NULL)
+ return SVC_DENIED;
+
+ /* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
+
+ if (memcmp(p, "nfs@", 4) != 0)
+ return SVC_DENIED;
+ p += 4;
+ if (strcmp(p, r->cl_server) != 0)
+ return SVC_DENIED;
+ return SVC_OK;
}
static int nfs_callback_authenticate(struct svc_rqst *rqstp)
{
- struct in_addr *addr = &rqstp->rq_addr.sin_addr;
- struct nfs4_client *clp;
+ struct nfs_client *clp;
+ RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+ int ret = SVC_OK;
/* Don't talk to strangers */
- clp = nfs4_find_client(addr);
+ clp = nfs_find_client(svc_addr(rqstp), 4);
if (clp == NULL)
return SVC_DROP;
- dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr));
- nfs4_put_client(clp);
+
+ dprintk("%s: %s NFSv4 callback!\n", __func__,
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+
switch (rqstp->rq_authop->flavour) {
case RPC_AUTH_NULL:
if (rqstp->rq_proc != CB_NULL)
- return SVC_DENIED;
+ ret = SVC_DENIED;
break;
case RPC_AUTH_UNIX:
break;
case RPC_AUTH_GSS:
- /* FIXME: RPCSEC_GSS handling? */
+ ret = check_gss_callback_principal(clp, rqstp);
+ break;
default:
- return SVC_DENIED;
+ ret = SVC_DENIED;
}
- return SVC_OK;
+ nfs_put_client(clp);
+ return ret;
}
/*
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff