From mboxrd@z Thu Jan 1 00:00:00 1970 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 7FBB2C83F1A for ; Tue, 29 Aug 2023 13:00:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235849AbjH2M7n (ORCPT ); Tue, 29 Aug 2023 08:59:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231961AbjH2M7M (ORCPT ); Tue, 29 Aug 2023 08:59:12 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07B571B3 for ; Tue, 29 Aug 2023 05:58:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1693313904; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PcZVcxRmn3GNyHxkEAfh4k2No7fPJOwWAslxk4zVVMM=; b=Muoy8crBYn1R17QtNFK1sFSU8BnZTAW3J4r7zPbJSuZEZt87Estb6UIXV8uRurqsowJV81 P8lacrmXJtGhM5M4tk38hLljOl3j2UmYDL//2Tuee/wYJe+kMPdditLdmpT9UAkaupXzpi kEXGB8Uyggqzupr4LvU/SE920GSz4Ig= Received: from mimecast-mx02.redhat.com (66.187.233.73 [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-428-hU3DPDQqN1ac1hJIWlyqoQ-1; Tue, 29 Aug 2023 08:58:22 -0400 X-MC-Unique: hU3DPDQqN1ac1hJIWlyqoQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 848DF3C0F677 for ; Tue, 29 Aug 2023 12:58:22 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.193.45]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0465340C2070; Tue, 29 Aug 2023 12:58:21 +0000 (UTC) From: Thomas Haller To: NetFilter Cc: Thomas Haller Subject: [PATCH nft v2 3/8] datatype: avoid cast-align warning with struct sockaddr result from getaddrinfo() Date: Tue, 29 Aug 2023 14:53:32 +0200 Message-ID: <20230829125809.232318-4-thaller@redhat.com> In-Reply-To: <20230829125809.232318-1-thaller@redhat.com> References: <20230829125809.232318-1-thaller@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org With CC=clang we get datatype.c:625:11: error: cast from 'struct sockaddr *' to 'struct sockaddr_in *' increases required alignment from 2 to 4 [-Werror,-Wcast-align] addr = ((struct sockaddr_in *)ai->ai_addr)->sin_addr; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ datatype.c:690:11: error: cast from 'struct sockaddr *' to 'struct sockaddr_in6 *' increases required alignment from 2 to 4 [-Werror,-Wcast-align] addr = ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ datatype.c:826:11: error: cast from 'struct sockaddr *' to 'struct sockaddr_in *' increases required alignment from 2 to 4 [-Werror,-Wcast-align] port = ((struct sockaddr_in *)ai->ai_addr)->sin_port; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fix that by casting to (void*) first. Also, add an assertion that the type is as expected. For inet_service_type_parse(), differentiate between AF_INET and AF_INET6. It might not have been a problem in practice, because the struct offsets of sin_port/sin6_port are identical. Signed-off-by: Thomas Haller --- src/datatype.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/src/datatype.c b/src/datatype.c index dd6a5fbf5df8..df2e500502fa 100644 --- a/src/datatype.c +++ b/src/datatype.c @@ -622,7 +622,8 @@ static struct error_record *ipaddr_type_parse(struct parse_ctx *ctx, return error(&sym->location, "Hostname resolves to multiple addresses"); } - addr = ((struct sockaddr_in *)ai->ai_addr)->sin_addr; + assert(ai->ai_addr->sa_family == AF_INET); + addr = ((struct sockaddr_in *) (void *) ai->ai_addr)->sin_addr; freeaddrinfo(ai); } @@ -687,7 +688,9 @@ static struct error_record *ip6addr_type_parse(struct parse_ctx *ctx, return error(&sym->location, "Hostname resolves to multiple addresses"); } - addr = ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr; + + assert(ai->ai_addr->sa_family == AF_INET6); + addr = ((struct sockaddr_in6 *)(void *)ai->ai_addr)->sin6_addr; freeaddrinfo(ai); } @@ -823,7 +826,12 @@ static struct error_record *inet_service_type_parse(struct parse_ctx *ctx, return error(&sym->location, "Could not resolve service: %s", gai_strerror(err)); - port = ((struct sockaddr_in *)ai->ai_addr)->sin_port; + if (ai->ai_addr->sa_family == AF_INET) + port = ((struct sockaddr_in *)(void *)ai->ai_addr)->sin_port; + else { + assert(ai->ai_addr->sa_family == AF_INET6); + port = ((struct sockaddr_in6 *)(void *)ai->ai_addr)->sin6_port; + } freeaddrinfo(ai); } -- 2.41.0