From: Neil Horman <nhorman@tuxdriver.com> To: Xin Long <lucien.xin@gmail.com> Cc: David Laight <David.Laight@aculab.com>, network dev <netdev@vger.kernel.org>, "linux-sctp@vger.kernel.org" <linux-sctp@vger.kernel.org>, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, "davem@davemloft.net" <davem@davemloft.net> Subject: Re: [PATCHv2 net-next 3/5] sctp: add SCTP_EXPOSE_POTENTIALLY_FAILED_STATE sockopt Date: Wed, 9 Oct 2019 12:15:08 -0400 [thread overview] Message-ID: <20191009161508.GB25555@hmswarspite.think-freely.org> (raw) In-Reply-To: <CADvbK_cFCuHAwxGAdY0BevrrAd6pQRP2tW_ej9mM3G4Aog3qpg@mail.gmail.com> On Tue, Oct 08, 2019 at 11:28:32PM +0800, Xin Long wrote: > On Tue, Oct 8, 2019 at 9:02 PM David Laight <David.Laight@aculab.com> wrote: > > > > From: Xin Long > > > Sent: 08 October 2019 12:25 > > > > > > This is a sockopt defined in section 7.3 of rfc7829: "Exposing > > > the Potentially Failed Path State", by which users can change > > > pf_expose per sock and asoc. > > > > If I read these patches correctly the default for this sockopt in 'enabled'. > > Doesn't this mean that old application binaries will receive notifications > > that they aren't expecting? > > > > I'd have thought that applications would be required to enable it. > If we do that, sctp_getsockopt_peer_addr_info() in patch 2/5 breaks. > I don't think we can safely do either of these things. Older applications still need to behave as they did prior to the introduction of this notification, and we shouldn't allow unexpected notifications to be sent. What if you added a check in get_peer_addr_info to only return -EACCESS if pf_expose is 0 and the application isn't subscribed to the PF event? Neil > > > > David > > > > - > > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK > > Registration No: 1397386 (Wales) > > >
WARNING: multiple messages have this Message-ID (diff)
From: Neil Horman <nhorman@tuxdriver.com> To: Xin Long <lucien.xin@gmail.com> Cc: David Laight <David.Laight@aculab.com>, network dev <netdev@vger.kernel.org>, "linux-sctp@vger.kernel.org" <linux-sctp@vger.kernel.org>, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, "davem@davemloft.net" <davem@davemloft.net> Subject: Re: [PATCHv2 net-next 3/5] sctp: add SCTP_EXPOSE_POTENTIALLY_FAILED_STATE sockopt Date: Wed, 09 Oct 2019 16:15:08 +0000 [thread overview] Message-ID: <20191009161508.GB25555@hmswarspite.think-freely.org> (raw) In-Reply-To: <CADvbK_cFCuHAwxGAdY0BevrrAd6pQRP2tW_ej9mM3G4Aog3qpg@mail.gmail.com> On Tue, Oct 08, 2019 at 11:28:32PM +0800, Xin Long wrote: > On Tue, Oct 8, 2019 at 9:02 PM David Laight <David.Laight@aculab.com> wrote: > > > > From: Xin Long > > > Sent: 08 October 2019 12:25 > > > > > > This is a sockopt defined in section 7.3 of rfc7829: "Exposing > > > the Potentially Failed Path State", by which users can change > > > pf_expose per sock and asoc. > > > > If I read these patches correctly the default for this sockopt in 'enabled'. > > Doesn't this mean that old application binaries will receive notifications > > that they aren't expecting? > > > > I'd have thought that applications would be required to enable it. > If we do that, sctp_getsockopt_peer_addr_info() in patch 2/5 breaks. > I don't think we can safely do either of these things. Older applications still need to behave as they did prior to the introduction of this notification, and we shouldn't allow unexpected notifications to be sent. What if you added a check in get_peer_addr_info to only return -EACCESS if pf_expose is 0 and the application isn't subscribed to the PF event? Neil > > > > David > > > > - > > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK > > Registration No: 1397386 (Wales) > > >
next prev parent reply other threads:[~2019-10-09 16:18 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-08 11:25 [PATCHv2 net-next 0/5] sctp: update from rfc7829 Xin Long 2019-10-08 11:25 ` Xin Long 2019-10-08 11:25 ` [PATCHv2 net-next 1/5] sctp: add SCTP_ADDR_POTENTIALLY_FAILED notification Xin Long 2019-10-08 11:25 ` Xin Long 2019-10-08 11:25 ` [PATCHv2 net-next 2/5] sctp: add pf_expose per netns and sock and asoc Xin Long 2019-10-08 11:25 ` Xin Long 2019-10-08 11:25 ` [PATCHv2 net-next 3/5] sctp: add SCTP_EXPOSE_POTENTIALLY_FAILED_STATE sockopt Xin Long 2019-10-08 11:25 ` Xin Long 2019-10-08 11:25 ` [PATCHv2 net-next 4/5] sctp: add support for Primary Path Switchover Xin Long 2019-10-08 11:25 ` Xin Long 2019-10-08 11:25 ` [PATCHv2 net-next 5/5] sctp: add SCTP_PEER_ADDR_THLDS_V2 sockopt Xin Long 2019-10-08 11:25 ` Xin Long 2019-10-08 13:02 ` [PATCHv2 net-next 3/5] sctp: add SCTP_EXPOSE_POTENTIALLY_FAILED_STATE sockopt David Laight 2019-10-08 13:02 ` David Laight 2019-10-08 15:28 ` Xin Long 2019-10-08 15:28 ` Xin Long 2019-10-09 16:15 ` Neil Horman [this message] 2019-10-09 16:15 ` Neil Horman 2019-10-10 9:28 ` Xin Long 2019-10-10 9:28 ` Xin Long 2019-10-10 12:40 ` Neil Horman 2019-10-10 12:40 ` Neil Horman 2019-10-11 15:57 ` Xin Long 2019-10-11 15:57 ` Xin Long 2019-10-11 16:25 ` Xin Long 2019-10-11 16:25 ` Xin Long 2019-10-11 21:29 ` Neil Horman 2019-10-11 21:29 ` Neil Horman 2019-10-14 8:36 ` Xin Long 2019-10-14 8:36 ` Xin Long 2019-10-14 8:49 ` David Laight 2019-10-14 8:49 ` David Laight 2019-10-14 12:41 ` Neil Horman 2019-10-14 12:41 ` Neil Horman 2019-10-14 13:48 ` David Laight 2019-10-18 15:34 ` [PATCHv2 net-next 2/5] sctp: add pf_expose per netns and sock and asoc David Laight 2019-10-18 15:34 ` David Laight 2019-10-19 8:45 ` Xin Long 2019-10-19 8:45 ` Xin Long 2019-10-22 11:29 ` David Laight 2019-10-22 11:29 ` David Laight
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