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219 lines
5.1 KiB
219 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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* |
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* CCID infrastructure |
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*/ |
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#include <linux/slab.h> |
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#include "ccid.h" |
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#include "ccids/lib/tfrc.h" |
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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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* |
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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 (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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err = -EFAULT; |
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else if (len > 0 && copy_to_user(optval, ccid_array, |
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len > array_len ? array_len : 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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static __printf(3, 4) struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...) |
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{ |
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struct kmem_cache *slab; |
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va_list args; |
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va_start(args, fmt); |
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vsnprintf(slab_name_fmt, CCID_SLAB_NAME_LENGTH, fmt, args); |
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va_end(args); |
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slab = kmem_cache_create(slab_name_fmt, sizeof(struct ccid) + obj_size, 0, |
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SLAB_HWCACHE_ALIGN, NULL); |
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return slab; |
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} |
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static void ccid_kmem_cache_destroy(struct kmem_cache *slab) |
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{ |
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kmem_cache_destroy(slab); |
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} |
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static int __init ccid_activate(struct ccid_operations *ccid_ops) |
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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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ccid_ops->ccid_hc_rx_slab_name, |
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"ccid%u_hc_rx_sock", |
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ccid_ops->ccid_id); |
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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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ccid_ops->ccid_hc_tx_slab_name, |
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"ccid%u_hc_tx_sock", |
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ccid_ops->ccid_id); |
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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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pr_info("DCCP: Activated CCID %d (%s)\n", |
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ccid_ops->ccid_id, ccid_ops->ccid_name); |
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err = 0; |
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out: |
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return err; |
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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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} |
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static void ccid_deactivate(struct ccid_operations *ccid_ops) |
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{ |
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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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pr_info("DCCP: Deactivated CCID %d (%s)\n", |
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ccid_ops->ccid_id, ccid_ops->ccid_name); |
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} |
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struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx) |
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{ |
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struct ccid_operations *ccid_ops = ccid_by_number(id); |
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struct ccid *ccid = NULL; |
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if (ccid_ops == NULL) |
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goto out; |
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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_any()); |
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if (ccid == NULL) |
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goto out; |
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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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out: |
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return ccid; |
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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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ccid = NULL; |
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goto out; |
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} |
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void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk) |
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{ |
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if (ccid != NULL) { |
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if (ccid->ccid_ops->ccid_hc_rx_exit != NULL) |
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ccid->ccid_ops->ccid_hc_rx_exit(sk); |
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kmem_cache_free(ccid->ccid_ops->ccid_hc_rx_slab, ccid); |
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} |
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} |
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void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk) |
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{ |
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if (ccid != NULL) { |
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if (ccid->ccid_ops->ccid_hc_tx_exit != NULL) |
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ccid->ccid_ops->ccid_hc_tx_exit(sk); |
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kmem_cache_free(ccid->ccid_ops->ccid_hc_tx_slab, ccid); |
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} |
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} |
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int __init ccid_initialize_builtins(void) |
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{ |
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int i, err = tfrc_lib_init(); |
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if (err) |
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return err; |
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for (i = 0; i < ARRAY_SIZE(ccids); i++) { |
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err = ccid_activate(ccids[i]); |
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if (err) |
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goto unwind_registrations; |
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} |
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return 0; |
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unwind_registrations: |
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while(--i >= 0) |
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ccid_deactivate(ccids[i]); |
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tfrc_lib_exit(); |
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return err; |
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} |
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void ccid_cleanup_builtins(void) |
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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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ccid_deactivate(ccids[i]); |
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tfrc_lib_exit(); |
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}
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