mirror of https://gitee.com/openkylin/linux.git
220 lines
5.1 KiB
C
220 lines
5.1 KiB
C
// 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 <acme@conectiva.com.br>
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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 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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