change wifi driver to cypress

hc

2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390

 kernel/net/dns_resolver/dns_key.c
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@@ -1,6 +1,6 @@
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 /* Key type used to cache DNS lookups made by the kernel
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  *
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- * See Documentation/networking/dns_resolver.txt
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+ * See Documentation/networking/dns_resolver.rst
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  *
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  *   Copyright (c) 2007 Igor Mammedov
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  *   Author(s): Igor Mammedov (niallain@gmail.com)
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@@ -29,6 +29,7 @@
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 #include <linux/keyctl.h>
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 #include <linux/err.h>
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 #include <linux/seq_file.h>
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+#include <linux/dns_resolver.h>
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 #include <keys/dns_resolver-type.h>
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 #include <keys/user-type.h>
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 #include "internal.h"
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@@ -48,27 +49,86 @@
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 /*
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  * Preparse instantiation data for a dns_resolver key.
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  *
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- * The data must be a NUL-terminated string, with the NUL char accounted in
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- * datalen.
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+ * For normal hostname lookups, the data must be a NUL-terminated string, with
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+ * the NUL char accounted in datalen.
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  *
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  * If the data contains a '#' characters, then we take the clause after each
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  * one to be an option of the form 'key=value'.  The actual data of interest is
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  * the string leading up to the first '#'.  For instance:
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  *
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  *        "ip1,ip2,...#foo=bar"
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+ *
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+ * For server list requests, the data must begin with a NUL char and be
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+ * followed by a byte indicating the version of the data format.  Version 1
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+ * looks something like (note this is packed):
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+ *
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+ *	u8      Non-string marker (ie. 0)
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+ *	u8	Content (DNS_PAYLOAD_IS_*)
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+ *	u8	Version (e.g. 1)
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+ *	u8	Source of server list
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+ *	u8	Lookup status of server list
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+ *	u8	Number of servers
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+ *	foreach-server {
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+ *		__le16	Name length
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+ *		__le16	Priority (as per SRV record, low first)
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+ *		__le16	Weight (as per SRV record, higher first)
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+ *		__le16	Port
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+ *		u8	Source of address list
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+ *		u8	Lookup status of address list
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+ *		u8	Protocol (DNS_SERVER_PROTOCOL_*)
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+ *		u8	Number of addresses
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+ *		char[]	Name (not NUL-terminated)
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+ *		foreach-address {
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+ *			u8		Family (DNS_ADDRESS_IS_*)
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+ *			union {
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+ *				u8[4]	ipv4_addr
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+ *				u8[16]	ipv6_addr
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+ *			}
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+ *		}
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+ *	}
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+ *
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  */
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 static int
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 dns_resolver_preparse(struct key_preparsed_payload *prep)
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 {
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+	const struct dns_payload_header *bin;
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 	struct user_key_payload *upayload;
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 	unsigned long derrno;
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 	int ret;
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 	int datalen = prep->datalen, result_len = 0;
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 	const char *data = prep->data, *end, *opt;
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+	if (datalen <= 1 || !data)
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+		return -EINVAL;
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+
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+	if (data[0] == 0) {
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+		/* It may be a server list. */
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+		if (datalen <= sizeof(*bin))
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+			return -EINVAL;
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+
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+		bin = (const struct dns_payload_header *)data;
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+		kenter("[%u,%u],%u", bin->content, bin->version, datalen);
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+		if (bin->content != DNS_PAYLOAD_IS_SERVER_LIST) {
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+			pr_warn_ratelimited(
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+				"dns_resolver: Unsupported content type (%u)\n",
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+				bin->content);
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+			return -EINVAL;
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+		}
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+
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+		if (bin->version != 1) {
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+			pr_warn_ratelimited(
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+				"dns_resolver: Unsupported server list version (%u)\n",
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+				bin->version);
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+			return -EINVAL;
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+		}
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+
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+		result_len = datalen;
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+		goto store_result;
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+	}
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+
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 	kenter("'%*.*s',%u", datalen, datalen, data, datalen);
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-	if (datalen <= 1 || !data || data[datalen - 1] != '\0')
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+	if (!data || data[datalen - 1] != '\0')
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 		return -EINVAL;
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 	datalen--;
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..
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@@ -144,6 +204,7 @@
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 		return 0;
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 	}
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+store_result:
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 	kdebug("store result");
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 	prep->quotalen = result_len;
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..
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@@ -253,6 +314,7 @@
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 struct key_type key_type_dns_resolver = {
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 	.name		= "dns_resolver",
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+	.flags		= KEY_TYPE_NET_DOMAIN,
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 	.preparse	= dns_resolver_preparse,
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 	.free_preparse	= dns_resolver_free_preparse,
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 	.instantiate	= generic_key_instantiate,