2005-08-10 03:14:34 +00:00
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/*
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* net/dccp/ccid.c
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* CCID infrastructure
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "ccid.h"
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2009-01-05 05:42:53 +00:00
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static struct ccid_operations *ccids[] = {
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&ccid2_ops,
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#ifdef CONFIG_IP_DCCP_CCID3
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&ccid3_ops,
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#endif
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};
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static struct ccid_operations *ccid_by_number(const u8 id)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ccids); i++)
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if (ccids[i]->ccid_id == id)
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return ccids[i];
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return NULL;
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}
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/* check that up to @array_len members in @ccid_array are supported */
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bool ccid_support_check(u8 const *ccid_array, u8 array_len)
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{
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while (array_len > 0)
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if (ccid_by_number(ccid_array[--array_len]) == NULL)
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return false;
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return true;
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}
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/**
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* ccid_get_builtin_ccids - Populate a list of built-in CCIDs
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* @ccid_array: pointer to copy into
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* @array_len: value to return length into
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* This function allocates memory - caller must see that it is freed after use.
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*/
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int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
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{
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*ccid_array = kmalloc(ARRAY_SIZE(ccids), gfp_any());
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if (*ccid_array == NULL)
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return -ENOBUFS;
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for (*array_len = 0; *array_len < ARRAY_SIZE(ccids); *array_len += 1)
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(*ccid_array)[*array_len] = ccids[*array_len]->ccid_id;
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return 0;
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}
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int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
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char __user *optval, int __user *optlen)
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{
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u8 *ccid_array, array_len;
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int err = 0;
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if (len < ARRAY_SIZE(ccids))
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return -EINVAL;
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if (ccid_get_builtin_ccids(&ccid_array, &array_len))
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return -ENOBUFS;
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if (put_user(array_len, optlen) ||
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copy_to_user(optval, ccid_array, array_len))
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err = -EFAULT;
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kfree(ccid_array);
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return err;
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}
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#ifdef ___OLD_INTERFACE_TO_BE_REMOVED___
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2008-11-12 08:47:26 +00:00
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static u8 builtin_ccids[] = {
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DCCPC_CCID2, /* CCID2 is supported by default */
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#if defined(CONFIG_IP_DCCP_CCID3) || defined(CONFIG_IP_DCCP_CCID3_MODULE)
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DCCPC_CCID3,
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#endif
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};
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2006-03-21 03:21:44 +00:00
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static struct ccid_operations *ccids[CCID_MAX];
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2005-08-10 03:14:34 +00:00
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#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
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static atomic_t ccids_lockct = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(ccids_lock);
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/*
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* The strategy is: modifications ccids vector are short, do not sleep and
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* veeery rare, but read access should be free of any exclusive locks.
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*/
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static void ccids_write_lock(void)
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{
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spin_lock(&ccids_lock);
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while (atomic_read(&ccids_lockct) != 0) {
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spin_unlock(&ccids_lock);
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yield();
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spin_lock(&ccids_lock);
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}
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}
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static inline void ccids_write_unlock(void)
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{
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spin_unlock(&ccids_lock);
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}
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static inline void ccids_read_lock(void)
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{
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atomic_inc(&ccids_lockct);
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2007-08-10 22:21:17 +00:00
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smp_mb__after_atomic_inc();
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2005-08-10 03:14:34 +00:00
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spin_unlock_wait(&ccids_lock);
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}
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static inline void ccids_read_unlock(void)
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{
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atomic_dec(&ccids_lockct);
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}
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#else
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#define ccids_write_lock() do { } while(0)
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#define ccids_write_unlock() do { } while(0)
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#define ccids_read_lock() do { } while(0)
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#define ccids_read_unlock() do { } while(0)
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#endif
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2009-01-05 05:42:53 +00:00
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#endif /* ___OLD_INTERFACE_TO_BE_REMOVED___ */
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2005-08-10 03:14:34 +00:00
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2006-12-07 04:33:20 +00:00
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static struct kmem_cache *ccid_kmem_cache_create(int obj_size, const char *fmt,...)
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2005-08-10 03:14:34 +00:00
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{
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2006-12-07 04:33:20 +00:00
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struct kmem_cache *slab;
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2006-03-21 03:21:44 +00:00
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char slab_name_fmt[32], *slab_name;
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va_list args;
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va_start(args, fmt);
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vsnprintf(slab_name_fmt, sizeof(slab_name_fmt), fmt, args);
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va_end(args);
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slab_name = kstrdup(slab_name_fmt, GFP_KERNEL);
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if (slab_name == NULL)
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return NULL;
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slab = kmem_cache_create(slab_name, sizeof(struct ccid) + obj_size, 0,
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2007-07-20 01:11:58 +00:00
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SLAB_HWCACHE_ALIGN, NULL);
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2006-03-21 03:21:44 +00:00
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if (slab == NULL)
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kfree(slab_name);
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return slab;
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}
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2006-12-07 04:33:20 +00:00
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static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
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2006-03-21 03:21:44 +00:00
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{
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if (slab != NULL) {
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const char *name = kmem_cache_name(slab);
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kmem_cache_destroy(slab);
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kfree(name);
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}
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}
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2009-01-05 05:42:53 +00:00
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#ifdef ___OLD_INTERFACE_TO_BE_REMOVED___
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2008-11-12 08:47:26 +00:00
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/* check that up to @array_len members in @ccid_array are supported */
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bool ccid_support_check(u8 const *ccid_array, u8 array_len)
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{
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u8 i, j, found;
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for (i = 0, found = 0; i < array_len; i++, found = 0) {
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for (j = 0; !found && j < ARRAY_SIZE(builtin_ccids); j++)
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found = (ccid_array[i] == builtin_ccids[j]);
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if (!found)
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return false;
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}
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return true;
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}
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/**
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* ccid_get_builtin_ccids - Provide copy of `builtin' CCID array
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* @ccid_array: pointer to copy into
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* @array_len: value to return length into
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* This function allocates memory - caller must see that it is freed after use.
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*/
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int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
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{
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*ccid_array = kmemdup(builtin_ccids, sizeof(builtin_ccids), gfp_any());
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if (*ccid_array == NULL)
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return -ENOBUFS;
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*array_len = ARRAY_SIZE(builtin_ccids);
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return 0;
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}
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int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
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char __user *optval, int __user *optlen)
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{
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if (len < sizeof(builtin_ccids))
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return -EINVAL;
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if (put_user(sizeof(builtin_ccids), optlen) ||
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copy_to_user(optval, builtin_ccids, sizeof(builtin_ccids)))
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return -EFAULT;
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return 0;
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}
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2009-01-05 05:42:53 +00:00
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#endif /* ___OLD_INTERFACE_TO_BE_REMOVED___ */
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2008-11-12 08:47:26 +00:00
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2009-01-05 05:42:53 +00:00
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static int ccid_activate(struct ccid_operations *ccid_ops)
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2006-03-21 03:21:44 +00:00
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{
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int err = -ENOBUFS;
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ccid_ops->ccid_hc_rx_slab =
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ccid_kmem_cache_create(ccid_ops->ccid_hc_rx_obj_size,
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2007-12-14 01:33:25 +00:00
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"ccid%u_hc_rx_sock",
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ccid_ops->ccid_id);
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2006-03-21 03:21:44 +00:00
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if (ccid_ops->ccid_hc_rx_slab == NULL)
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goto out;
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ccid_ops->ccid_hc_tx_slab =
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ccid_kmem_cache_create(ccid_ops->ccid_hc_tx_obj_size,
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2007-12-14 01:33:25 +00:00
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"ccid%u_hc_tx_sock",
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ccid_ops->ccid_id);
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2006-03-21 03:21:44 +00:00
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if (ccid_ops->ccid_hc_tx_slab == NULL)
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goto out_free_rx_slab;
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2005-08-10 03:14:34 +00:00
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2009-01-05 05:42:53 +00:00
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pr_info("CCID: Activated CCID %d (%s)\n",
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2006-03-21 03:21:44 +00:00
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ccid_ops->ccid_id, ccid_ops->ccid_name);
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2009-01-05 05:42:53 +00:00
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err = 0;
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2006-03-21 03:21:44 +00:00
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out:
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2005-08-10 03:14:34 +00:00
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return err;
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2006-03-21 03:21:44 +00:00
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out_free_rx_slab:
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
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ccid_ops->ccid_hc_rx_slab = NULL;
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goto out;
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2005-08-10 03:14:34 +00:00
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}
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2009-01-05 05:42:53 +00:00
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static void ccid_deactivate(struct ccid_operations *ccid_ops)
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2005-08-10 03:14:34 +00:00
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{
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2006-03-21 03:21:44 +00:00
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
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ccid_ops->ccid_hc_tx_slab = NULL;
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ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
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ccid_ops->ccid_hc_rx_slab = NULL;
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2009-01-05 05:42:53 +00:00
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pr_info("CCID: Deactivated CCID %d (%s)\n",
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2006-03-21 03:21:44 +00:00
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ccid_ops->ccid_id, ccid_ops->ccid_name);
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2005-08-10 03:14:34 +00:00
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}
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2006-03-21 03:21:44 +00:00
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struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx, gfp_t gfp)
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2005-08-10 03:14:34 +00:00
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{
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2009-01-05 05:42:53 +00:00
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struct ccid_operations *ccid_ops = ccid_by_number(id);
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2006-03-21 03:21:44 +00:00
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struct ccid *ccid = NULL;
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2005-08-10 03:14:34 +00:00
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2006-03-21 03:21:44 +00:00
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if (ccid_ops == NULL)
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2009-01-05 05:42:53 +00:00
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goto out;
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2005-08-10 03:14:34 +00:00
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2006-03-21 03:21:44 +00:00
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ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
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ccid_ops->ccid_hc_tx_slab, gfp);
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if (ccid == NULL)
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2009-01-05 05:42:53 +00:00
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goto out;
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2006-03-21 03:21:44 +00:00
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ccid->ccid_ops = ccid_ops;
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if (rx) {
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memset(ccid + 1, 0, ccid_ops->ccid_hc_rx_obj_size);
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if (ccid->ccid_ops->ccid_hc_rx_init != NULL &&
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ccid->ccid_ops->ccid_hc_rx_init(ccid, sk) != 0)
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goto out_free_ccid;
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} else {
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memset(ccid + 1, 0, ccid_ops->ccid_hc_tx_obj_size);
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if (ccid->ccid_ops->ccid_hc_tx_init != NULL &&
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ccid->ccid_ops->ccid_hc_tx_init(ccid, sk) != 0)
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goto out_free_ccid;
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}
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2005-08-10 03:14:34 +00:00
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out:
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return ccid;
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2006-03-21 03:21:44 +00:00
|
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out_free_ccid:
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kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
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ccid_ops->ccid_hc_tx_slab, ccid);
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2005-08-10 03:14:34 +00:00
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ccid = NULL;
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goto out;
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}
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|
2006-03-21 03:21:44 +00:00
|
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EXPORT_SYMBOL_GPL(ccid_new);
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2005-08-10 03:14:34 +00:00
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|
2006-03-21 03:21:44 +00:00
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static void ccid_delete(struct ccid *ccid, struct sock *sk, int rx)
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{
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struct ccid_operations *ccid_ops;
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|
2005-08-10 03:14:34 +00:00
|
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if (ccid == NULL)
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return;
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|
|
|
2006-03-21 03:21:44 +00:00
|
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ccid_ops = ccid->ccid_ops;
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|
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if (rx) {
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if (ccid_ops->ccid_hc_rx_exit != NULL)
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ccid_ops->ccid_hc_rx_exit(sk);
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|
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kmem_cache_free(ccid_ops->ccid_hc_rx_slab, ccid);
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} else {
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if (ccid_ops->ccid_hc_tx_exit != NULL)
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ccid_ops->ccid_hc_tx_exit(sk);
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kmem_cache_free(ccid_ops->ccid_hc_tx_slab, ccid);
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}
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}
|
2005-08-10 03:14:34 +00:00
|
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|
2006-03-21 03:21:44 +00:00
|
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void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk)
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{
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ccid_delete(ccid, sk, 1);
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}
|
2005-08-10 03:14:34 +00:00
|
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|
2006-03-21 03:21:44 +00:00
|
|
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EXPORT_SYMBOL_GPL(ccid_hc_rx_delete);
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void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk)
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{
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|
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ccid_delete(ccid, sk, 0);
|
2005-08-10 03:14:34 +00:00
|
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}
|
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|
2006-03-21 03:21:44 +00:00
|
|
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EXPORT_SYMBOL_GPL(ccid_hc_tx_delete);
|
2009-01-05 05:42:53 +00:00
|
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|
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int __init ccid_initialize_builtins(void)
|
|
|
|
{
|
|
|
|
int i, err;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ccids); i++) {
|
|
|
|
err = ccid_activate(ccids[i]);
|
|
|
|
if (err)
|
|
|
|
goto unwind_registrations;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
unwind_registrations:
|
|
|
|
while(--i >= 0)
|
|
|
|
ccid_deactivate(ccids[i]);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
void ccid_cleanup_builtins(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ccids); i++)
|
|
|
|
ccid_deactivate(ccids[i]);
|
|
|
|
}
|