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Fri, 30 Oct 2026 10:03:27 +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 n4EiGW9r5GrlAQAAD6G6ig (envelope-from ); Fri, 30 Oct 2026 10:03:27 +0000 Message-ID: <53223bf8-8871-4b24-82c4-a86a26b50904@suse.de> Date: Fri, 30 Oct 2026 11:02:16 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH nf-next v2] netfilter: nft_flow_offload: do not offload multicast To: Koral Ilgun , netfilter-devel@vger.kernel.org Cc: pablo@netfilter.org, fw@strlen.de, phil@nwl.cc, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Koral Ilgun References: <20261029220144.2474139-1-koralilgun@gmail.com> Content-Language: en-US From: Fernando Fernandez Mancera In-Reply-To: <20261029220144.2474139-1-koralilgun@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Flag: NO X-Spam-Level: X-Spamd-Result: default: False [-13.29 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; RCPT_COUNT_SEVEN(0.00)[9]; FREEMAIL_TO(0.00)[gmail.com,vger.kernel.org]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[adtran.com:email,suse.de:email,imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -13.29 On 10/29/26 11:01 PM, Koral Ilgun wrote: > From: Koral Ilgun > > A flow holds one output per direction, which it resolves when it is > added. The outputs of a multicast route change when listeners join > or leave. So a multicast flow in the flowtable continues to send to > the output that it resolved, also after the last listener left, and > the counters of the multicast routing stop. > > A ruleset can keep multicast out with a match before the flow > offload statement. Without one, IPv4 multicast stays out of the > flowtable only because the reverse route lookup in nft_flow_route() > refuses a multicast source address. The IPv6 route lookup has no such > check, so IPv6 multicast that ip6mr forwards goes into the flowtable. > > Skip a multicast destination for both families in the flow offload > expression itself, so that the result no longer depends on the > ruleset or on the route lookup. > > Signed-off-by: Koral Ilgun Reviewed-by: Fernando Fernandez Mancera Thanks!