From patchwork Tue Feb 22 12:18:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michael Tremer X-Patchwork-Id: 5221 Return-Path: Received: from mail01.ipfire.org (mail01.haj.ipfire.org [172.28.1.202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) client-signature ECDSA (P-384)) (Client CN "mail01.haj.ipfire.org", Issuer "R3" (verified OK)) by web04.haj.ipfire.org (Postfix) with ESMTPS id 4K2yqt1177z3xgf for ; Tue, 22 Feb 2022 12:18:18 +0000 (UTC) Received: from mail02.haj.ipfire.org (mail02.haj.ipfire.org [172.28.1.201]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) client-signature ECDSA (P-384)) (Client CN "mail02.haj.ipfire.org", Issuer "R3" (verified OK)) by mail01.ipfire.org (Postfix) with ESMTPS id 4K2yqp45kPz5Qb; Tue, 22 Feb 2022 12:18:14 +0000 (UTC) Received: from mail02.haj.ipfire.org (localhost [127.0.0.1]) by mail02.haj.ipfire.org (Postfix) with ESMTP id 4K2yqp0DJRz30Hd; Tue, 22 Feb 2022 12:18:14 +0000 (UTC) Received: from mail01.ipfire.org (mail01.haj.ipfire.org [172.28.1.202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) client-signature ECDSA (P-384)) (Client CN "mail01.haj.ipfire.org", Issuer "R3" (verified OK)) by mail02.haj.ipfire.org (Postfix) with ESMTPS id 4K2yqm0PLdz2y3C for ; Tue, 22 Feb 2022 12:18:12 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by mail01.ipfire.org (Postfix) with ESMTPSA id 4K2yql67b9z33v; Tue, 22 Feb 2022 12:18:11 +0000 (UTC) DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=ipfire.org; s=202003ed25519; t=1645532291; 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=UOH9sDkLTssrtr/l58aKA8VgjMC6R5U2NDv5TtLgV00=; b=24DbEEZLLZwBQtERwNRTXQSJf3dg4r9mt3GCyKxNzqJrcQKApqbW8ciekrrf7xpTu9BNuI DdpXdbNnKB4OQDAQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ipfire.org; s=202003rsa; t=1645532291; 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=UOH9sDkLTssrtr/l58aKA8VgjMC6R5U2NDv5TtLgV00=; b=wZTU1FK7ubXW8cn1KRIVK1uw1bXdchlE2ScWWeG862HBrxRYI9CiBCeP0w/HnMXo5AfRaK KKs6bSuj7mOvhmFIMZ09lCSDgT/NthHvckvoIz+FTzVOvN1LW3/ycqeShBZ5cz7wlCOBbp aF1LxGCG2OgqqfjCEi1DHyeA6Wce1uu/KnWWNbCSPRzKcoj8peU1mua/qZX5rnc1o1Yy3v h5A5WyY4qr2VNY9ivUCw2nK/uihJxFUY9iTE9/RQ1sqxfCi5RVgifnrkXNMLZWXfGA1nud uPL3cPEv0Fq3LvFe7dfWK6S3NvdoNslM9xAQfWemaldx/oPABgfw6ecuA6PvUg== From: Michael Tremer To: development@lists.ipfire.org Subject: [PATCH 3/3] dhcpcd: Allow freely setting MTU Date: Tue, 22 Feb 2022 12:18:06 +0000 Message-Id: <20220222121806.1208994-3-michael.tremer@ipfire.org> In-Reply-To: <20220222121806.1208994-1-michael.tremer@ipfire.org> References: <20220222121806.1208994-1-michael.tremer@ipfire.org> MIME-Version: 1.0 X-BeenThere: development@lists.ipfire.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IPFire development talk List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michael Tremer Errors-To: development-bounces@lists.ipfire.org Sender: "Development" Signed-off-by: Michael Tremer Reviewed-by: Peter Müller --- lfs/dhcpcd | 1 + ...ow-free-selection-of-MTU-by-the-user.patch | 44 +++++++++++++++++++ 2 files changed, 45 insertions(+) create mode 100644 src/patches/dhcpcd-9.4.0-Allow-free-selection-of-MTU-by-the-user.patch diff --git a/lfs/dhcpcd b/lfs/dhcpcd index 8291d076a..03349ddc7 100644 --- a/lfs/dhcpcd +++ b/lfs/dhcpcd @@ -70,6 +70,7 @@ $(subst %,%_MD5,$(objects)) : $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects)) @$(PREBUILD) @rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE) + cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/dhcpcd-9.4.0-Allow-free-selection-of-MTU-by-the-user.patch cd $(DIR_APP) && ./configure \ --prefix="" \ --sysconfdir=/var/ipfire/dhcpc \ diff --git a/src/patches/dhcpcd-9.4.0-Allow-free-selection-of-MTU-by-the-user.patch b/src/patches/dhcpcd-9.4.0-Allow-free-selection-of-MTU-by-the-user.patch new file mode 100644 index 000000000..69a35daf5 --- /dev/null +++ b/src/patches/dhcpcd-9.4.0-Allow-free-selection-of-MTU-by-the-user.patch @@ -0,0 +1,44 @@ +From 1acff721a3874a74efc9921a1e07bd48bd7efab0 Mon Sep 17 00:00:00 2001 +From: Michael Tremer +Date: Tue, 22 Feb 2022 12:07:15 +0000 +Subject: [PATCH] Allow free selection of MTU by the user + +Various ISPs (or equipment?) seem to hand out an MTU of only 576 bytes. +Hwoever, this does not seem to be intentional which is why we would like +to manually overwrite this in the configuration. + +dhcpcd only allows setting a maximum MTU of 1472 bytes which does not +seem to have any rationale (any more). Although Ethernet might limit any +MTU to less, IPv6 and IPv4 support MTUs of up to 64KiB. + +This patch allows the user to configure the MTU freely with providing +some sanity check. + +Signed-off-by: Michael Tremer +--- + src/dhcp-common.h | 9 +++++---- + 1 file changed, 5 insertions(+), 4 deletions(-) + +diff --git a/src/dhcp-common.h b/src/dhcp-common.h +index a82fcd4c..d6620822 100644 +--- a/src/dhcp-common.h ++++ b/src/dhcp-common.h +@@ -46,10 +46,11 @@ + #define NS_MAXLABEL MAXLABEL + #endif + +-/* Max MTU - defines dhcp option length */ +-#define IP_UDP_SIZE 28 +-#define MTU_MAX 1500 - IP_UDP_SIZE +-#define MTU_MIN 576 + IP_UDP_SIZE ++/* Max/Min MTU */ ++#define MTU_MAX 65536 ++#define MTU_MIN 576 ++ ++#define IP_UDP_SIZE 28 + + #define OT_REQUEST (1 << 0) + #define OT_UINT8 (1 << 1) +-- +2.30.2 +