#include "ccid.h"
-static struct ccid *ccids[CCID_MAX];
+static u8 builtin_ccids[] = {
+ DCCPC_CCID2, /* CCID2 is supported by default */
+#if defined(CONFIG_IP_DCCP_CCID3) || defined(CONFIG_IP_DCCP_CCID3_MODULE)
+ DCCPC_CCID3,
+#endif
+};
+
+static struct ccid_operations *ccids[CCID_MAX];
#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
static atomic_t ccids_lockct = ATOMIC_INIT(0);
static DEFINE_SPINLOCK(ccids_lock);
static inline void ccids_read_lock(void)
{
atomic_inc(&ccids_lockct);
+ smp_mb__after_atomic_inc();
spin_unlock_wait(&ccids_lock);
}
#define ccids_read_unlock() do { } while(0)
#endif
-int ccid_register(struct ccid *ccid)
+static struct kmem_cache *ccid_kmem_cache_create(int obj_size, const char *fmt,...)
{
- int err;
+ 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;
+}
- if (ccid->ccid_init == NULL)
- return -1;
+static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
+{
+ if (slab != NULL) {
+ const char *name = kmem_cache_name(slab);
+
+ kmem_cache_destroy(slab);
+ kfree(name);
+ }
+}
+
+/* check that up to @array_len members in @ccid_array are supported */
+bool ccid_support_check(u8 const *ccid_array, u8 array_len)
+{
+ u8 i, j, found;
+
+ for (i = 0, found = 0; i < array_len; i++, found = 0) {
+ for (j = 0; !found && j < ARRAY_SIZE(builtin_ccids); j++)
+ found = (ccid_array[i] == builtin_ccids[j]);
+ if (!found)
+ return false;
+ }
+ return true;
+}
+
+/**
+ * ccid_get_builtin_ccids - Provide copy of `builtin' CCID array
+ * @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)
+{
+ *ccid_array = kmemdup(builtin_ccids, sizeof(builtin_ccids), gfp_any());
+ if (*ccid_array == NULL)
+ return -ENOBUFS;
+ *array_len = ARRAY_SIZE(builtin_ccids);
+ return 0;
+}
+
+int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
+{
+ if (len < sizeof(builtin_ccids))
+ return -EINVAL;
+
+ if (put_user(sizeof(builtin_ccids), optlen) ||
+ copy_to_user(optval, builtin_ccids, sizeof(builtin_ccids)))
+ return -EFAULT;
+ return 0;
+}
+
+int ccid_register(struct ccid_operations *ccid_ops)
+{
+ 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;
ccids_write_lock();
err = -EEXIST;
- if (ccids[ccid->ccid_id] == NULL) {
- ccids[ccid->ccid_id] = ccid;
+ if (ccids[ccid_ops->ccid_id] == NULL) {
+ ccids[ccid_ops->ccid_id] = ccid_ops;
err = 0;
}
ccids_write_unlock();
- if (err == 0)
- pr_info("CCID: Registered CCID %d (%s)\n",
- ccid->ccid_id, ccid->ccid_name);
+ if (err != 0)
+ goto out_free_tx_slab;
+
+ pr_info("CCID: Registered CCID %d (%s)\n",
+ ccid_ops->ccid_id, ccid_ops->ccid_name);
+out:
return err;
+out_free_tx_slab:
+ ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
+ ccid_ops->ccid_hc_tx_slab = NULL;
+ goto out;
+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_register);
-int ccid_unregister(struct ccid *ccid)
+int ccid_unregister(struct ccid_operations *ccid_ops)
{
ccids_write_lock();
- ccids[ccid->ccid_id] = NULL;
+ ccids[ccid_ops->ccid_id] = NULL;
ccids_write_unlock();
+
+ 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: Unregistered CCID %d (%s)\n",
- ccid->ccid_id, ccid->ccid_name);
+ ccid_ops->ccid_id, ccid_ops->ccid_name);
return 0;
}
EXPORT_SYMBOL_GPL(ccid_unregister);
-struct ccid *ccid_init(unsigned char id, struct sock *sk)
+/**
+ * ccid_request_module - Pre-load CCID module for later use
+ * This should be called only from process context (e.g. during connection
+ * setup) and is necessary for later calls to ccid_new (typically in software
+ * interrupt), so that it has the modules available when they are needed.
+ */
+static int ccid_request_module(u8 id)
{
- struct ccid *ccid;
+ if (!in_atomic()) {
+ ccids_read_lock();
+ if (ccids[id] == NULL) {
+ ccids_read_unlock();
+ return request_module("net-dccp-ccid-%d", id);
+ }
+ ccids_read_unlock();
+ }
+ return 0;
+}
+int ccid_request_modules(u8 const *ccid_array, u8 array_len)
+{
#ifdef CONFIG_KMOD
- if (ccids[id] == NULL)
- request_module("net-dccp-ccid-%d", id);
+ while (array_len--)
+ if (ccid_request_module(ccid_array[array_len]))
+ return -1;
#endif
+ return 0;
+}
+
+struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx, gfp_t gfp)
+{
+ struct ccid_operations *ccid_ops;
+ struct ccid *ccid = NULL;
+
ccids_read_lock();
+ ccid_ops = ccids[id];
+ if (ccid_ops == NULL)
+ goto out_unlock;
- ccid = ccids[id];
- if (ccid == NULL)
- goto out;
+ if (!try_module_get(ccid_ops->ccid_owner))
+ goto out_unlock;
- if (!try_module_get(ccid->ccid_owner))
- goto out_err;
+ ccids_read_unlock();
- if (ccid->ccid_init(sk) != 0)
+ ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
+ ccid_ops->ccid_hc_tx_slab, gfp);
+ if (ccid == NULL)
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_unlock:
+ ccids_read_unlock();
+ goto out;
+out_free_ccid:
+ kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
+ ccid_ops->ccid_hc_tx_slab, ccid);
ccid = NULL;
+out_module_put:
+ module_put(ccid_ops->ccid_owner);
goto out;
}
-EXPORT_SYMBOL_GPL(ccid_init);
+EXPORT_SYMBOL_GPL(ccid_new);
-void ccid_exit(struct ccid *ccid, struct sock *sk)
+static void ccid_delete(struct ccid *ccid, struct sock *sk, int rx)
{
+ struct ccid_operations *ccid_ops;
+
if (ccid == NULL)
return;
+ ccid_ops = ccid->ccid_ops;
+ if (rx) {
+ if (ccid_ops->ccid_hc_rx_exit != NULL)
+ ccid_ops->ccid_hc_rx_exit(sk);
+ kmem_cache_free(ccid_ops->ccid_hc_rx_slab, ccid);
+ } else {
+ if (ccid_ops->ccid_hc_tx_exit != NULL)
+ ccid_ops->ccid_hc_tx_exit(sk);
+ kmem_cache_free(ccid_ops->ccid_hc_tx_slab, ccid);
+ }
ccids_read_lock();
+ if (ccids[ccid_ops->ccid_id] != NULL)
+ module_put(ccid_ops->ccid_owner);
+ ccids_read_unlock();
+}
- if (ccids[ccid->ccid_id] != NULL) {
- if (ccid->ccid_exit != NULL)
- ccid->ccid_exit(sk);
- module_put(ccid->ccid_owner);
- }
+void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk)
+{
+ ccid_delete(ccid, sk, 1);
+}
- ccids_read_unlock();
+EXPORT_SYMBOL_GPL(ccid_hc_rx_delete);
+
+void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk)
+{
+ ccid_delete(ccid, sk, 0);
}
-EXPORT_SYMBOL_GPL(ccid_exit);
+EXPORT_SYMBOL_GPL(ccid_hc_tx_delete);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff