From patchwork Mon Dec 5 23:45:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elijah Conners X-Patchwork-Id: 13065212 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45651C4708C for ; Tue, 6 Dec 2022 00:01:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231599AbiLFABO (ORCPT ); Mon, 5 Dec 2022 19:01:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231213AbiLFABN (ORCPT ); Mon, 5 Dec 2022 19:01:13 -0500 X-Greylist: delayed 904 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 05 Dec 2022 16:01:12 PST Received: from sender4-of-o54.zoho.com (sender4-of-o54.zoho.com [136.143.188.54]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E399EF029 for ; Mon, 5 Dec 2022 16:01:12 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1670283944; cv=none; d=zohomail.com; s=zohoarc; b=M7uP12WajbP+jO5MSBT8kI3uQueg94eE4KGafD+V0CnvtDKCtGjUlbQ+F+VzxjLzEuEa1b7h6NHMAkVxEICfs/e1RAeyXcBYG5E3gIzfprLBHQf1c/lnEyzydTKmisvYMe1DnrY9KnAUDXq9bAxvtytzUitWnJtf2t2g7abzN7s= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1670283944; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:MIME-Version:Message-ID:Subject:To; bh=AGiFRxdZLW6juIrUoq64NLI4cQyBdJI/u7NhEzTeBC4=; b=njUaLxzb8NCptfjO4oa6qHjUSM/6E3yHCD3hSQ7fV42PbeuDQPfMgpkFUe24jOIUjIRA5nIC5uI1x1EmBHVAeBpSuEmTng1XdrML6Mow8qEnZcGq7tI5WYR0S0ySuDa3bGpdjXLr9Ma6Yg6zhFLADEgy2ttrkSbh66kfsmKgVb0= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass smtp.mailfrom=business@elijahpepe.com; dmarc=pass header.from= Received: from mail.zoho.com by mx.zohomail.com with SMTP id 1670283942325782.359895905616; Mon, 5 Dec 2022 15:45:42 -0800 (PST) Date: Mon, 05 Dec 2022 15:45:42 -0800 From: Elijah Conners To: "samba-technical" , "linux-cifs" Cc: "lsahlber" , "sfrench" , "pc" , "sprasad" , "tom" Message-ID: <184e4ae599e.dafedd623365931.2204914765704117230@elijahpepe.com> In-Reply-To: Subject: [PATCH] cifs: add ipv6 parsing MIME-Version: 1.0 Importance: Medium User-Agent: Zoho Mail X-Mailer: Zoho Mail Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org CIFS currently lacks IPv6 parsing, presenting complications for CIFS over IPv6. To parse both IPv4 and IPv6 addresses, the parse_srvaddr() function was altered; parse_srvaddr() now returns void. To retrieve the IP address from parse_srvaddr(), the parameters *out6 and *out32, an in6_addr and a __be32 respectively, are provided. The value of root_server_addr is determined by if those parameters are set or not. The parsing in parse_srvaddr() was updated slightly. The character addr can hold up to 46 characters, the longest a possible IPv6 address can be. In the while loop, isdigit() has been replaced with isxdigit() to account for letters present in IPv6 addresses, and *start is also checked for being a colon. Finally, the function uses inet_pton() to determine if the address is an IPv6 address; if so, *out6 is equal to in6, set by inet_pton, otherwise, *out32 is set to in_aton(addr). Signed-off-by: Elijah Conners --- fs/cifs/cifsroot.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-) diff --git a/fs/cifs/cifsroot.c b/fs/cifs/cifsroot.c index 9e91a5a40aae..f0aba7c824dc 100644 --- a/fs/cifs/cifsroot.c +++ b/fs/cifs/cifsroot.c @@ -14,6 +14,7 @@ #include #include #include +#include #define DEFAULT_MNT_OPTS \ "vers=1.0,cifsacl,mfsymlinks,rsize=1048576,wsize=65536,uid=0,gid=0," \ @@ -22,19 +23,24 @@ static char root_dev[2048] __initdata = ""; static char root_opts[1024] __initdata = DEFAULT_MNT_OPTS; -static __be32 __init parse_srvaddr(char *start, char *end) -{ - /* TODO: ipv6 support */ - char addr[sizeof("aaa.bbb.ccc.ddd")]; +static void __init parse_srvaddr(char *start, char *end, struct in6_addr *out6, __be32 *out32) +{ + char addr[INET6_ADDRSTRLEN]; + struct in6_addr in6; int i = 0; while (start < end && i < sizeof(addr) - 1) { - if (isdigit(*start) || *start == '.') + if (isxdigit(*start) || *start == '.' || *start == ':') addr[i++] = *start; start++; } addr[i] = '\0'; - return in_aton(addr); + + if (inet_pton(AF_INET6, addr, &in6) > 0) { + *out6 = in6; + } else { + *out32 = in_aton(addr); + } } /* cifsroot=///[,options] */ @@ -42,7 +48,8 @@ static int __init cifs_root_setup(char *line) { char *s; int len; - __be32 srvaddr = htonl(INADDR_NONE); + struct in6_addr addr6; + __be32 addr32; ROOT_DEV = Root_CIFS; @@ -60,7 +67,7 @@ static int __init cifs_root_setup(char *line) return 1; } strlcpy(root_dev, line, len); - srvaddr = parse_srvaddr(&line[2], s); + parse_srvaddr(&line[2], s, &addr6, &addr32); if (*s) { int n = snprintf(root_opts, sizeof(root_opts), "%s,%s", @@ -73,7 +80,11 @@ static int __init cifs_root_setup(char *line) } } - root_server_addr = srvaddr; + if (addr6.is_set) { + root_server_addr = addr6; + } else if (addr32.is_set) { + root_server_addr = addr32; + } return 1; }