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([2a01:e35:8b63:dc30:a891:eeb0:d9a7:6bd2]) by smtp.gmail.com with ESMTPSA id v13sm2844629wra.54.2019.02.08.06.18.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 08 Feb 2019 06:18:06 -0800 (PST) Reply-To: nicolas.dichtel@6wind.com Subject: Re: [PATCH net-next] ipmr: ip6mr: Create new sockopt to clear mfc cache or vifs To: Callum Sinclair , davem@davemloft.net, kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, nikolay@cumulusnetworks.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20190208041103.31299-1-callum.sinclair@alliedtelesis.co.nz> <20190208041103.31299-2-callum.sinclair@alliedtelesis.co.nz> From: Nicolas Dichtel Organization: 6WIND Message-ID: Date: Fri, 8 Feb 2019 15:18:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190208041103.31299-2-callum.sinclair@alliedtelesis.co.nz> Content-Type: text/plain; charset=utf-8 Content-Language: fr Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 08/02/2019 à 05:11, Callum Sinclair a écrit : > Currently the only way to clear the mfc cache was to delete the entries mfc stands for 'multicast forwarding cache', so 'mfc cache' is a bit strange. > one by one using the MRT_DEL_MFC socket option or to destroy and > recreate the socket. Note that if entries were added with MRT_ADD_MFC_PROXY, they will survive to the socket destruction. This is not the case with your new cmd. Is it intended? Maybe a third option (something like MRT_FLUSH_MFC_PROXY) would be useful to avoid confusion? > > Create a new socket option which will clear the multicast forwarding > cache on the socket without destroying the socket. The new socket option > MRT_FLUSH_ENTRIES will clear all multicast entries on the sockets table > and the MRT_FLUSH_VIFS will delete all multicast vifs on the socket > table. > > Signed-off-by: Callum Sinclair > --- > include/uapi/linux/mroute.h | 7 +++- > include/uapi/linux/mroute6.h | 7 +++- > net/ipv4/ipmr.c | 69 ++++++++++++++++++++------------- > net/ipv6/ip6mr.c | 74 ++++++++++++++++++++++-------------- > 4 files changed, 100 insertions(+), 57 deletions(-) > > diff --git a/include/uapi/linux/mroute.h b/include/uapi/linux/mroute.h > index 5d37a9ccce63..673495ca3495 100644 > --- a/include/uapi/linux/mroute.h > +++ b/include/uapi/linux/mroute.h > @@ -28,12 +28,17 @@ > #define MRT_TABLE (MRT_BASE+9) /* Specify mroute table ID */ > #define MRT_ADD_MFC_PROXY (MRT_BASE+10) /* Add a (*,*|G) mfc entry */ > #define MRT_DEL_MFC_PROXY (MRT_BASE+11) /* Del a (*,*|G) mfc entry */ > -#define MRT_MAX (MRT_BASE+11) > +#define MRT_FLUSH (MRT_BASE+12) /* Flush all multicast entries and vifs */ nit: "Flush all mfc entries and/or vifs" ? > +#define MRT_MAX (MRT_BASE+12) > > #define SIOCGETVIFCNT SIOCPROTOPRIVATE /* IP protocol privates */ > #define SIOCGETSGCNT (SIOCPROTOPRIVATE+1) > #define SIOCGETRPF (SIOCPROTOPRIVATE+2) > > +/* MRT_FLUSH optional flags */ > +#define MRT_FLUSH_ENTRIES 1 /* For flushing all multicast entries */ Maybe MRT_FLUSH_MFC is more consistent with the previous naming (MRT_ADD_MFC, etc.) Regards, Nicolas