Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 395 insertions, 0 deletions

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
new file mode 100644
index 000000000000..9bcec9b927b9
--- /dev/null
+++ b/net/sunrpc/auth.c
@@ -0,0 +1,395 @@
+/*
+ * linux/net/sunrpc/auth.c
+ *
+ * Generic RPC client authentication API.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/spinlock.h>
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+static struct rpc_authops *     auth_flavors[RPC_AUTH_MAXFLAVOR] = {
+        &authnull_ops,          /* AUTH_NULL */
+        &authunix_ops,          /* AUTH_UNIX */
+        NULL,                   /* others can be loadable modules */
+};
+
+static u32
+pseudoflavor_to_flavor(u32 flavor) {
+        if (flavor >= RPC_AUTH_MAXFLAVOR)
+                return RPC_AUTH_GSS;
+        return flavor;
+}
+
+int
+rpcauth_register(struct rpc_authops *ops)
+{
+        rpc_authflavor_t flavor;
+
+        if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
+                return -EINVAL;
+        if (auth_flavors[flavor] != NULL)
+                return -EPERM;          /* what else? */
+        auth_flavors[flavor] = ops;
+        return 0;
+}
+
+int
+rpcauth_unregister(struct rpc_authops *ops)
+{
+        rpc_authflavor_t flavor;
+
+        if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
+                return -EINVAL;
+        if (auth_flavors[flavor] != ops)
+                return -EPERM;          /* what else? */
+        auth_flavors[flavor] = NULL;
+        return 0;
+}
+
+struct rpc_auth *
+rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
+{
+        struct rpc_auth         *auth;
+        struct rpc_authops      *ops;
+        u32                     flavor = pseudoflavor_to_flavor(pseudoflavor);
+
+        if (flavor >= RPC_AUTH_MAXFLAVOR || !(ops = auth_flavors[flavor]))
+                return NULL;
+        auth = ops->create(clnt, pseudoflavor);
+        if (!auth)
+                return NULL;
+        if (clnt->cl_auth)
+                rpcauth_destroy(clnt->cl_auth);
+        clnt->cl_auth = auth;
+        return auth;
+}
+
+void
+rpcauth_destroy(struct rpc_auth *auth)
+{
+        if (!atomic_dec_and_test(&auth->au_count))
+                return;
+        auth->au_ops->destroy(auth);
+}
+
+static DEFINE_SPINLOCK(rpc_credcache_lock);
+
+/*
+ * Initialize RPC credential cache
+ */
+int
+rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
+{
+        struct rpc_cred_cache *new;
+        int i;
+
+        new = (struct rpc_cred_cache *)kmalloc(sizeof(*new), GFP_KERNEL);
+        if (!new)
+                return -ENOMEM;
+        for (i = 0; i < RPC_CREDCACHE_NR; i++)
+                INIT_HLIST_HEAD(&new->hashtable[i]);
+        new->expire = expire;
+        new->nextgc = jiffies + (expire >> 1);
+        auth->au_credcache = new;
+        return 0;
+}
+
+/*
+ * Destroy a list of credentials
+ */
+static inline
+void rpcauth_destroy_credlist(struct hlist_head *head)
+{
+        struct rpc_cred *cred;
+
+        while (!hlist_empty(head)) {
+                cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
+                hlist_del_init(&cred->cr_hash);
+                put_rpccred(cred);
+        }
+}
+
+/*
+ * Clear the RPC credential cache, and delete those credentials
+ * that are not referenced.
+ */
+void
+rpcauth_free_credcache(struct rpc_auth *auth)
+{
+        struct rpc_cred_cache *cache = auth->au_credcache;
+        HLIST_HEAD(free);
+        struct hlist_node *pos, *next;
+        struct rpc_cred *cred;
+        int             i;
+
+        spin_lock(&rpc_credcache_lock);
+        for (i = 0; i < RPC_CREDCACHE_NR; i++) {
+                hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
+                        cred = hlist_entry(pos, struct rpc_cred, cr_hash);
+                        __hlist_del(&cred->cr_hash);
+                        hlist_add_head(&cred->cr_hash, &free);
+                }
+        }
+        spin_unlock(&rpc_credcache_lock);
+        rpcauth_destroy_credlist(&free);
+}
+
+static void
+rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist_head *free)
+{
+        if (atomic_read(&cred->cr_count) != 1)
+               return;
+        if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
+                cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+        if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
+                __hlist_del(&cred->cr_hash);
+                hlist_add_head(&cred->cr_hash, free);
+        }
+}
+
+/*
+ * Remove stale credentials. Avoid sleeping inside the loop.
+ */
+static void
+rpcauth_gc_credcache(struct rpc_auth *auth, struct hlist_head *free)
+{
+        struct rpc_cred_cache *cache = auth->au_credcache;
+        struct hlist_node *pos, *next;
+        struct rpc_cred *cred;
+        int             i;
+
+        dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
+        for (i = 0; i < RPC_CREDCACHE_NR; i++) {
+                hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
+                        cred = hlist_entry(pos, struct rpc_cred, cr_hash);
+                        rpcauth_prune_expired(auth, cred, free);
+                }
+        }
+        cache->nextgc = jiffies + cache->expire;
+}
+
+/*
+ * Look up a process' credentials in the authentication cache
+ */
+struct rpc_cred *
+rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
+                int taskflags)
+{
+        struct rpc_cred_cache *cache = auth->au_credcache;
+        HLIST_HEAD(free);
+        struct hlist_node *pos, *next;
+        struct rpc_cred *new = NULL,
+                        *cred = NULL;
+        int             nr = 0;
+
+        if (!(taskflags & RPC_TASK_ROOTCREDS))
+                nr = acred->uid & RPC_CREDCACHE_MASK;
+retry:
+        spin_lock(&rpc_credcache_lock);
+        if (time_before(cache->nextgc, jiffies))
+                rpcauth_gc_credcache(auth, &free);
+        hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
+                struct rpc_cred *entry;
+                entry = hlist_entry(pos, struct rpc_cred, cr_hash);
+                if (entry->cr_ops->crmatch(acred, entry, taskflags)) {
+                        hlist_del(&entry->cr_hash);
+                        cred = entry;
+                        break;
+                }
+                rpcauth_prune_expired(auth, entry, &free);
+        }
+        if (new) {
+                if (cred)
+                        hlist_add_head(&new->cr_hash, &free);
+                else
+                        cred = new;
+        }
+        if (cred) {
+                hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
+                get_rpccred(cred);
+        }
+        spin_unlock(&rpc_credcache_lock);
+
+        rpcauth_destroy_credlist(&free);
+
+        if (!cred) {
+                new = auth->au_ops->crcreate(auth, acred, taskflags);
+                if (!IS_ERR(new)) {
+#ifdef RPC_DEBUG
+                        new->cr_magic = RPCAUTH_CRED_MAGIC;
+#endif
+                        goto retry;
+                } else
+                        cred = new;
+        }
+
+        return (struct rpc_cred *) cred;
+}
+
+struct rpc_cred *
+rpcauth_lookupcred(struct rpc_auth *auth, int taskflags)
+{
+        struct auth_cred acred = {
+                .uid = current->fsuid,
+                .gid = current->fsgid,
+                .group_info = current->group_info,
+        };
+        struct rpc_cred *ret;
+
+        dprintk("RPC:     looking up %s cred\n",
+                auth->au_ops->au_name);
+        get_group_info(acred.group_info);
+        ret = auth->au_ops->lookup_cred(auth, &acred, taskflags);
+        put_group_info(acred.group_info);
+        return ret;
+}
+
+struct rpc_cred *
+rpcauth_bindcred(struct rpc_task *task)
+{
+        struct rpc_auth *auth = task->tk_auth;
+        struct auth_cred acred = {
+                .uid = current->fsuid,
+                .gid = current->fsgid,
+                .group_info = current->group_info,
+        };
+        struct rpc_cred *ret;
+
+        dprintk("RPC: %4d looking up %s cred\n",
+                task->tk_pid, task->tk_auth->au_ops->au_name);
+        get_group_info(acred.group_info);
+        ret = auth->au_ops->lookup_cred(auth, &acred, task->tk_flags);
+        if (!IS_ERR(ret))
+                task->tk_msg.rpc_cred = ret;
+        else
+                task->tk_status = PTR_ERR(ret);
+        put_group_info(acred.group_info);
+        return ret;
+}
+
+void
+rpcauth_holdcred(struct rpc_task *task)
+{
+        dprintk("RPC: %4d holding %s cred %p\n",
+                task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
+        if (task->tk_msg.rpc_cred)
+                get_rpccred(task->tk_msg.rpc_cred);
+}
+
+void
+put_rpccred(struct rpc_cred *cred)
+{
+        cred->cr_expire = jiffies;
+        if (!atomic_dec_and_test(&cred->cr_count))
+                return;
+        cred->cr_ops->crdestroy(cred);
+}
+
+void
+rpcauth_unbindcred(struct rpc_task *task)
+{
+        struct rpc_auth *auth = task->tk_auth;
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        dprintk("RPC: %4d releasing %s cred %p\n",
+                task->tk_pid, auth->au_ops->au_name, cred);
+
+        put_rpccred(cred);
+        task->tk_msg.rpc_cred = NULL;
+}
+
+u32 *
+rpcauth_marshcred(struct rpc_task *task, u32 *p)
+{
+        struct rpc_auth *auth = task->tk_auth;
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        dprintk("RPC: %4d marshaling %s cred %p\n",
+                task->tk_pid, auth->au_ops->au_name, cred);
+        return cred->cr_ops->crmarshal(task, p);
+}
+
+u32 *
+rpcauth_checkverf(struct rpc_task *task, u32 *p)
+{
+        struct rpc_auth *auth = task->tk_auth;
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        dprintk("RPC: %4d validating %s cred %p\n",
+                task->tk_pid, auth->au_ops->au_name, cred);
+        return cred->cr_ops->crvalidate(task, p);
+}
+
+int
+rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
+                u32 *data, void *obj)
+{
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        dprintk("RPC: %4d using %s cred %p to wrap rpc data\n",
+                        task->tk_pid, cred->cr_ops->cr_name, cred);
+        if (cred->cr_ops->crwrap_req)
+                return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
+        /* By default, we encode the arguments normally. */
+        return encode(rqstp, data, obj);
+}
+
+int
+rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
+                u32 *data, void *obj)
+{
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        dprintk("RPC: %4d using %s cred %p to unwrap rpc data\n",
+                        task->tk_pid, cred->cr_ops->cr_name, cred);
+        if (cred->cr_ops->crunwrap_resp)
+                return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
+                                                   data, obj);
+        /* By default, we decode the arguments normally. */
+        return decode(rqstp, data, obj);
+}
+
+int
+rpcauth_refreshcred(struct rpc_task *task)
+{
+        struct rpc_auth *auth = task->tk_auth;
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+        int err;
+
+        dprintk("RPC: %4d refreshing %s cred %p\n",
+                task->tk_pid, auth->au_ops->au_name, cred);
+        err = cred->cr_ops->crrefresh(task);
+        if (err < 0)
+                task->tk_status = err;
+        return err;
+}
+
+void
+rpcauth_invalcred(struct rpc_task *task)
+{
+        dprintk("RPC: %4d invalidating %s cred %p\n",
+                task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
+        spin_lock(&rpc_credcache_lock);
+        if (task->tk_msg.rpc_cred)
+                task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+        spin_unlock(&rpc_credcache_lock);
+}
+
+int
+rpcauth_uptodatecred(struct rpc_task *task)
+{
+        return !(task->tk_msg.rpc_cred) ||
+                (task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
+}