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b=9DVUgKCQYkafabgN/89Y8m75p2RUkalDiYDEH4T5pK50lCZnkIyayKSDkWuIPcc3/XRTSa DyM1FlrzsCWGUXDA== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 0D6B24A0B0; Wed, 1 Apr 2026 08:07:16 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id Ig1cADTSzGmjbwAAD6G6ig (envelope-from ); Wed, 01 Apr 2026 08:07:16 +0000 Message-ID: <42caa438-3854-449c-b0ee-4f40772e5c1b@suse.de> Date: Wed, 1 Apr 2026 10:07:11 +0200 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] Deprecate Legacy IP To: David Woodhouse , Saeed Mahameed , Leon Romanovsky , Tariq Toukan , Mark Bloch , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Nikolay Aleksandrov , Ido Schimmel , Martin KaFai Lau , Daniel Borkmann , John Fastabend , Stanislav Fomichev , Alexei Starovoitov , Andrii Nakryiko , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Kuniyuki Iwashima , Willem de Bruijn , David Ahern , Neal Cardwell , Johannes Berg , Pablo Neira Ayuso , Florian Westphal , Phil Sutter , Guillaume Nault , David Woodhouse , Kees Cook , Alexei Lazar , Gal Pressman , Paul Moore , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, oss-drivers@corigine.com, bridge@lists.linux.dev, bpf@vger.kernel.org, linux-wireless@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, torvalds@linux-foundation.org, jon.maddog.hall@gmail.com References: <20260401074509.1897527-1-dwmw2@infradead.org> Content-Language: en-US From: Fernando Fernandez Mancera In-Reply-To: <20260401074509.1897527-1-dwmw2@infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; MIME_TRACE(0.00)[0:+]; FREEMAIL_TO(0.00)[infradead.org,nvidia.com,kernel.org,lunn.ch,davemloft.net,google.com,redhat.com,blackwall.org,linux.dev,iogearbox.net,gmail.com,fomichev.me,sipsolutions.net,netfilter.org,strlen.de,nwl.cc,amazon.co.uk,paul-moore.com,vger.kernel.org,corigine.com,lists.linux.dev,linux-foundation.org]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_TRACE(0.00)[suse.de:+]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_COUNT_TWO(0.00)[2]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_GT_50(0.00)[50]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; R_RATELIMIT(0.00)[to_ip_from(RL8aabfxbaot1y4156cjn3w58a)]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[netdev]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:dkim,suse.de:email,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -3.01 X-Spam-Level: X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: BC7414D1E6 On 4/1/26 9:44 AM, David Woodhouse wrote: > RFC1883, the IPv6 standard, was published in the final decade of the 1900s. > That's closer in time to the Apollo 11 moon landing than it was to today. > > Even our esteemed Maddog has worked with computers for longer in the IPv6 > era, than he ever did before it. > > Yet Linux still can't even be *built* with only IPv6 support and without > support for Legacy IP. This long overdue patch series fixes that, and > immediately marks Legacy IP for deprecation. > > It also cleans up a few tautological "INET && IPV6" and "INET || IPV6" > checks, since IPV6 (and now LEGACY_IP) cannot be selected without the > overall CONFIG_INET option. > > For now, we only add a warning when a process *listens* on a Legacy IP > socket (since you can listen on IPv6 and still accept connections which > have come through a timewarp from the 20th century. Adding warnings for > making outbound connections or *accepting* on Legacy IP can come later. > > 'I would be happy if "Legacy IP" ceased to be the "industry standard" > and IPv6 be the default, even if I had to beat IPv6 into the head of > every single network administrator's head with a shovel.' said Jon > 'maddog' Hall, ancient supporter of Free and Open Source Software. > Dammit, you've beaten me to it! This was my next step for 7.2. Fully-endorsed-by: Fernando Fernandez Mancera