v4.19.13 snapshot.
diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c
new file mode 100644
index 0000000..90f77d0
--- /dev/null
+++ b/net/dccp/ccid.c
@@ -0,0 +1,222 @@
+/*
+ * net/dccp/ccid.c
+ *
+ * An implementation of the DCCP protocol
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * CCID infrastructure
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/slab.h>
+
+#include "ccid.h"
+#include "ccids/lib/tfrc.h"
+
+static struct ccid_operations *ccids[] = {
+ &ccid2_ops,
+#ifdef CONFIG_IP_DCCP_CCID3
+ &ccid3_ops,
+#endif
+};
+
+static struct ccid_operations *ccid_by_number(const u8 id)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ccids); i++)
+ if (ccids[i]->ccid_id == id)
+ return ccids[i];
+ return NULL;
+}
+
+/* check that up to @array_len members in @ccid_array are supported */
+bool ccid_support_check(u8 const *ccid_array, u8 array_len)
+{
+ while (array_len > 0)
+ if (ccid_by_number(ccid_array[--array_len]) == NULL)
+ return false;
+ return true;
+}
+
+/**
+ * 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)
+{
+ *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;
+}
+
+int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
+{
+ u8 *ccid_array, array_len;
+ int err = 0;
+
+ if (ccid_get_builtin_ccids(&ccid_array, &array_len))
+ return -ENOBUFS;
+
+ if (put_user(array_len, optlen))
+ err = -EFAULT;
+ else if (len > 0 && copy_to_user(optval, ccid_array,
+ len > array_len ? array_len : len))
+ err = -EFAULT;
+
+ kfree(ccid_array);
+ return err;
+}
+
+static struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...)
+{
+ struct kmem_cache *slab;
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(slab_name_fmt, CCID_SLAB_NAME_LENGTH, fmt, args);
+ va_end(args);
+
+ slab = kmem_cache_create(slab_name_fmt, sizeof(struct ccid) + obj_size, 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ return slab;
+}
+
+static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
+{
+ kmem_cache_destroy(slab);
+}
+
+static int __init ccid_activate(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_ops->ccid_hc_rx_slab_name,
+ "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_ops->ccid_hc_tx_slab_name,
+ "ccid%u_hc_tx_sock",
+ ccid_ops->ccid_id);
+ if (ccid_ops->ccid_hc_tx_slab == NULL)
+ goto out_free_rx_slab;
+
+ pr_info("DCCP: 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;
+}
+
+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("DCCP: Deactivated CCID %d (%s)\n",
+ ccid_ops->ccid_id, ccid_ops->ccid_name);
+}
+
+struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx)
+{
+ struct ccid_operations *ccid_ops = ccid_by_number(id);
+ struct ccid *ccid = NULL;
+
+ if (ccid_ops == NULL)
+ goto out;
+
+ ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
+ ccid_ops->ccid_hc_tx_slab, gfp_any());
+ if (ccid == NULL)
+ goto out;
+ 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:
+ return ccid;
+out_free_ccid:
+ kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
+ ccid_ops->ccid_hc_tx_slab, ccid);
+ ccid = NULL;
+ goto out;
+}
+
+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_hc_tx_delete(struct ccid *ccid, struct sock *sk)
+{
+ 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();
+
+ if (err)
+ return 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]);
+ tfrc_lib_exit();
+ return err;
+}
+
+void ccid_cleanup_builtins(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ccids); i++)
+ ccid_deactivate(ccids[i]);
+ tfrc_lib_exit();
+}