*/
#include "ccid.h"
+#include "ccids/lib/tfrc.h"
-static struct ccid *ccids[CCID_MAX];
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
-static atomic_t ccids_lockct = ATOMIC_INIT(0);
-static DEFINE_SPINLOCK(ccids_lock);
+static struct ccid_operations *ccids[] = {
+ &ccid2_ops,
+#ifdef CONFIG_IP_DCCP_CCID3
+ &ccid3_ops,
+#endif
+};
-/*
- * The strategy is: modifications ccids vector are short, do not sleep and
- * veeery rare, but read access should be free of any exclusive locks.
- */
-static void ccids_write_lock(void)
+static struct ccid_operations *ccid_by_number(const u8 id)
{
- spin_lock(&ccids_lock);
- while (atomic_read(&ccids_lockct) != 0) {
- spin_unlock(&ccids_lock);
- yield();
- spin_lock(&ccids_lock);
- }
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ccids); i++)
+ if (ccids[i]->ccid_id == id)
+ return ccids[i];
+ return NULL;
}
-static inline void ccids_write_unlock(void)
+/* check that up to @array_len members in @ccid_array are supported */
+bool ccid_support_check(u8 const *ccid_array, u8 array_len)
{
- spin_unlock(&ccids_lock);
+ while (array_len > 0)
+ if (ccid_by_number(ccid_array[--array_len]) == NULL)
+ return false;
+ return true;
}
-static inline void ccids_read_lock(void)
+/**
+ * ccid_get_builtin_ccids - Populate a list of built-in CCIDs
+ * @ccid_array: pointer to copy into
+ * @array_len: value to return length into
+ * This function allocates memory - caller must see that it is freed after use.
+ */
+int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
{
- atomic_inc(&ccids_lockct);
- spin_unlock_wait(&ccids_lock);
+ *ccid_array = kmalloc(ARRAY_SIZE(ccids), gfp_any());
+ if (*ccid_array == NULL)
+ return -ENOBUFS;
+
+ for (*array_len = 0; *array_len < ARRAY_SIZE(ccids); *array_len += 1)
+ (*ccid_array)[*array_len] = ccids[*array_len]->ccid_id;
+ return 0;
}
-static inline void ccids_read_unlock(void)
+int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
{
- atomic_dec(&ccids_lockct);
+ u8 *ccid_array, array_len;
+ int err = 0;
+
+ if (len < ARRAY_SIZE(ccids))
+ return -EINVAL;
+
+ if (ccid_get_builtin_ccids(&ccid_array, &array_len))
+ return -ENOBUFS;
+
+ if (put_user(array_len, optlen) ||
+ copy_to_user(optval, ccid_array, array_len))
+ err = -EFAULT;
+
+ kfree(ccid_array);
+ return err;
}
-#else
-#define ccids_write_lock() do { } while(0)
-#define ccids_write_unlock() do { } while(0)
-#define ccids_read_lock() do { } while(0)
-#define ccids_read_unlock() do { } while(0)
-#endif
+static struct kmem_cache *ccid_kmem_cache_create(int obj_size, const char *fmt,...)
+{
+ struct kmem_cache *slab;
+ char slab_name_fmt[32], *slab_name;
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(slab_name_fmt, sizeof(slab_name_fmt), fmt, args);
+ va_end(args);
+
+ slab_name = kstrdup(slab_name_fmt, GFP_KERNEL);
+ if (slab_name == NULL)
+ return NULL;
+ slab = kmem_cache_create(slab_name, sizeof(struct ccid) + obj_size, 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (slab == NULL)
+ kfree(slab_name);
+ return slab;
+}
-int ccid_register(struct ccid *ccid)
+static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
{
- int err;
+ if (slab != NULL) {
+ const char *name = kmem_cache_name(slab);
- ccids_write_lock();
- err = -EEXIST;
- if (ccids[ccid->ccid_id] == NULL) {
- ccids[ccid->ccid_id] = ccid;
- err = 0;
+ kmem_cache_destroy(slab);
+ kfree(name);
}
- ccids_write_unlock();
- if (err == 0)
- pr_info("CCID: Registered CCID %d (%s)\n",
- ccid->ccid_id, ccid->ccid_name);
- return err;
}
-EXPORT_SYMBOL_GPL(ccid_register);
-
-int ccid_unregister(struct ccid *ccid)
+static int ccid_activate(struct ccid_operations *ccid_ops)
{
- ccids_write_lock();
- ccids[ccid->ccid_id] = NULL;
- ccids_write_unlock();
- pr_info("CCID: Unregistered CCID %d (%s)\n",
- ccid->ccid_id, ccid->ccid_name);
- return 0;
+ int err = -ENOBUFS;
+
+ ccid_ops->ccid_hc_rx_slab =
+ ccid_kmem_cache_create(ccid_ops->ccid_hc_rx_obj_size,
+ "ccid%u_hc_rx_sock",
+ ccid_ops->ccid_id);
+ if (ccid_ops->ccid_hc_rx_slab == NULL)
+ goto out;
+
+ ccid_ops->ccid_hc_tx_slab =
+ ccid_kmem_cache_create(ccid_ops->ccid_hc_tx_obj_size,
+ "ccid%u_hc_tx_sock",
+ ccid_ops->ccid_id);
+ if (ccid_ops->ccid_hc_tx_slab == NULL)
+ goto out_free_rx_slab;
+
+ pr_info("CCID: Activated CCID %d (%s)\n",
+ ccid_ops->ccid_id, ccid_ops->ccid_name);
+ err = 0;
+out:
+ return err;
+out_free_rx_slab:
+ ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
+ ccid_ops->ccid_hc_rx_slab = NULL;
+ goto out;
}
-EXPORT_SYMBOL_GPL(ccid_unregister);
+static void ccid_deactivate(struct ccid_operations *ccid_ops)
+{
+ ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
+ ccid_ops->ccid_hc_tx_slab = NULL;
+ ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
+ ccid_ops->ccid_hc_rx_slab = NULL;
+
+ pr_info("CCID: Deactivated CCID %d (%s)\n",
+ ccid_ops->ccid_id, ccid_ops->ccid_name);
+}
-struct ccid *ccid_init(unsigned char id, struct sock *sk)
+struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx)
{
- struct ccid *ccid;
+ struct ccid_operations *ccid_ops = ccid_by_number(id);
+ struct ccid *ccid = NULL;
-#ifdef CONFIG_KMOD
- if (ccids[id] == NULL)
- request_module("net-dccp-ccid-%d", id);
-#endif
- ccids_read_lock();
+ if (ccid_ops == NULL)
+ goto out;
- ccid = ccids[id];
+ ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
+ ccid_ops->ccid_hc_tx_slab, gfp_any());
if (ccid == NULL)
goto out;
-
- if (!try_module_get(ccid->ccid_owner))
- goto out_err;
-
- if (ccid->ccid_init != NULL && ccid->ccid_init(sk) != 0)
- goto out_module_put;
+ ccid->ccid_ops = ccid_ops;
+ if (rx) {
+ memset(ccid + 1, 0, ccid_ops->ccid_hc_rx_obj_size);
+ if (ccid->ccid_ops->ccid_hc_rx_init != NULL &&
+ ccid->ccid_ops->ccid_hc_rx_init(ccid, sk) != 0)
+ goto out_free_ccid;
+ } else {
+ memset(ccid + 1, 0, ccid_ops->ccid_hc_tx_obj_size);
+ if (ccid->ccid_ops->ccid_hc_tx_init != NULL &&
+ ccid->ccid_ops->ccid_hc_tx_init(ccid, sk) != 0)
+ goto out_free_ccid;
+ }
out:
- ccids_read_unlock();
return ccid;
-out_module_put:
- module_put(ccid->ccid_owner);
-out_err:
+out_free_ccid:
+ kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
+ ccid_ops->ccid_hc_tx_slab, ccid);
ccid = NULL;
goto out;
}
-EXPORT_SYMBOL_GPL(ccid_init);
+void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk)
+{
+ if (ccid != NULL) {
+ if (ccid->ccid_ops->ccid_hc_rx_exit != NULL)
+ ccid->ccid_ops->ccid_hc_rx_exit(sk);
+ kmem_cache_free(ccid->ccid_ops->ccid_hc_rx_slab, ccid);
+ }
+}
-void ccid_exit(struct ccid *ccid, struct sock *sk)
+void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk)
{
- if (ccid == NULL)
- return;
+ if (ccid != NULL) {
+ if (ccid->ccid_ops->ccid_hc_tx_exit != NULL)
+ ccid->ccid_ops->ccid_hc_tx_exit(sk);
+ kmem_cache_free(ccid->ccid_ops->ccid_hc_tx_slab, ccid);
+ }
+}
+
+int __init ccid_initialize_builtins(void)
+{
+ int i, err = tfrc_lib_init();
- ccids_read_lock();
+ if (err)
+ return err;
- if (ccids[ccid->ccid_id] != NULL) {
- if (ccid->ccid_exit != NULL)
- ccid->ccid_exit(sk);
- module_put(ccid->ccid_owner);
+ for (i = 0; i < ARRAY_SIZE(ccids); i++) {
+ err = ccid_activate(ccids[i]);
+ if (err)
+ goto unwind_registrations;
}
+ return 0;
- ccids_read_unlock();
+unwind_registrations:
+ while(--i >= 0)
+ ccid_deactivate(ccids[i]);
+ tfrc_lib_exit();
+ return err;
}
-EXPORT_SYMBOL_GPL(ccid_exit);
+void ccid_cleanup_builtins(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ccids); i++)
+ ccid_deactivate(ccids[i]);
+ tfrc_lib_exit();
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff