Date: Fri, 14 Jan 2022 09:20:47 -0900 From: Rob Wing <rew@freebsd.org> To: Mike Karels <mike@karels.net> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: eb18708ec8c7 - main - syncache: accept packet with no SA when TCP_MD5SIG is set Message-ID: <CAF3%2Bn_f8Uh_ttjWQS11dLoMtA_-Mxaon6hLRkq-3V_%2B5h9kFgw@mail.gmail.com> In-Reply-To: <202201122226.20CMQwMw007750@mail.karels.net> References: <CAF3%2Bn_eOVx=WwVqO4rHja_3r3sqmj94theYRgqmQaMxU9X5=JQ@mail.gmail.com> <202201122226.20CMQwMw007750@mail.karels.net>
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--0000000000007a3ef705d58edcb7 Content-Type: text/plain; charset="UTF-8" On Wed, Jan 12, 2022 at 1:27 PM Mike Karels <mike@karels.net> wrote: > Rob wrote: > > For what it's worth, this behavior is consistent with OpenBSD. > > That's a useful data point, thanks. > There is value in having the same semantics as OpenBSD for the TCP_MD5SIG option <https://man.openbsd.org/tcp.4>. If OpenBSD's semantics of the TCP_MD5SIG option were different, I likely would have taken a different approach. And also given that FreeBSD and OpenBSD's TCP_MD5SIG option had the same behavior until we diverged in 2017. ..that's how I ended up going in this direction -Rob > > Mike > > > -Rob > > > > > > > > Mike > > > > > > On 8 Jan 2022, at 19:45, Robert Wing wrote: > > > > > > > The branch main has been updated by rew: > > > > > > > > URL: > > > > https://cgit.FreeBSD.org/src/commit/?id=3Deb18708ec8c7e1de6a05aba41971659= > > 549991b10 > > > > > > > > commit eb18708ec8c7e1de6a05aba41971659549991b10 > > > > Author: Robert Wing <rew@FreeBSD.org> > > > > AuthorDate: 2022-01-09 01:07:50 +0000 > > > > Commit: Robert Wing <rew@FreeBSD.org> > > > > CommitDate: 2022-01-09 01:32:14 +0000 > > > > > > > > syncache: accept packet with no SA when TCP_MD5SIG is set > > > > > > > > When TCP_MD5SIG is set on a socket, all packets are dropped that > > > don't > > > > contain an MD5 signature. Relax this behavior to accept a > non-signe= > > d > > > > packet when a security association doesn't exist with the peer. > > > > > > > > This is useful when a listen socket set with TCP_MD5SIG wants to > > > handle > > > > connections protected with and without MD5 signatures. > > > > > > > > Reviewed by: bz (previous version) > > > > Sponsored by: nepustil.net > > > > Sponsored by: Klara Inc. > > > > Differential Revision: https://reviews.freebsd.org/D33227 > > > > --- > > > > share/man/man4/tcp.4 | 6 +++++- > > > > sys/netinet/tcp_syncache.c | 30 ++++++++++++++++++------------ > > > > sys/netipsec/xform_tcp.c | 5 +++++ > > > > 3 files changed, 28 insertions(+), 13 deletions(-) > > > > > > > > diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 > > > > index 17138fa224ba..d103293132ba 100644 > > > > --- a/share/man/man4/tcp.4 > > > > +++ b/share/man/man4/tcp.4 > > > > @@ -34,7 +34,7 @@ > > > > .\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93 > > > > .\" $FreeBSD$ > > > > .\" > > > > -.Dd June 27, 2021 > > > > +.Dd January 8, 2022 > > > > .Dt TCP 4 > > > > .Os > > > > .Sh NAME > > > > @@ -339,6 +339,10 @@ This entry can only be specified on a per-host > > > basis at this time. > > > > .Pp > > > > If an SADB entry cannot be found for the destination, > > > > the system does not send any outgoing segments and drops any inbound > > > segments. > > > > +However, during connection negotiation, a non-signed segment will be > > > accepted if > > > > +an SADB entry does not exist between hosts. > > > > +When a non-signed segment is accepted, the established connection > is n= > > ot > > > > +protected with MD5 digests. > > > > .It Dv TCP_STATS > > > > Manage collection of connection level statistics using the > > > > .Xr stats 3 > > > > diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c > > > > index 7dd8443cad65..32ca3bc2209b 100644 > > > > --- a/sys/netinet/tcp_syncache.c > > > > +++ b/sys/netinet/tcp_syncache.c > > > > @@ -1514,19 +1514,25 @@ syncache_add(struct in_conninfo *inc, struct > > > tcpopt *to, struct tcphdr *th, > > > > > > > > #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) > > > > /* > > > > - * If listening socket requested TCP digests, check that > received > > > > - * SYN has signature and it is correct. If signature doesn't > matc= > > h > > > > - * or TCP_SIGNATURE support isn't enabled, drop the packet. > > > > + * When the socket is TCP-MD5 enabled check that, > > > > + * - a signed packet is valid > > > > + * - a non-signed packet does not have a security association > > > > + * > > > > + * If a signed packet fails validation or a non-signed packet > ha= > > s > > > a > > > > + * security association, the packet will be dropped. > > > > */ > > > > if (ltflags & TF_SIGNATURE) { > > > > - if ((to->to_flags & TOF_SIGNATURE) =3D=3D 0) { > > > > - TCPSTAT_INC(tcps_sig_err_nosigopt); > > > > - goto done; > > > > + if (to->to_flags & TOF_SIGNATURE) { > > > > + if (!TCPMD5_ENABLED() || > > > > + TCPMD5_INPUT(m, th, to->to_signature) !=3D > 0) > > > > + goto done; > > > > + } else { > > > > + if (TCPMD5_ENABLED() && > > > > + TCPMD5_INPUT(m, NULL, NULL) !=3D ENOENT) > > > > + goto done; > > > > } > > > > - if (!TCPMD5_ENABLED() || > > > > - TCPMD5_INPUT(m, th, to->to_signature) !=3D 0) > > > > - goto done; > > > > - } > > > > + } else if (to->to_flags & TOF_SIGNATURE) > > > > + goto done; > > > > #endif /* TCP_SIGNATURE */ > > > > /* > > > > * See if we already have an entry for this connection. > > > > @@ -1724,11 +1730,11 @@ skip_alloc: > > > > } > > > > #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) > > > > /* > > > > - * If listening socket requested TCP digests, flag this in the > > > > + * If incoming packet has an MD5 signature, flag this in the > > > > * syncache so that syncache_respond() will do the right thing > > > > * with the SYN+ACK. > > > > */ > > > > - if (ltflags & TF_SIGNATURE) > > > > + if (to->to_flags & TOF_SIGNATURE) > > > > sc->sc_flags |=3D SCF_SIGNATURE; > > > > #endif /* TCP_SIGNATURE */ > > > > if (to->to_flags & TOF_SACKPERM) > > > > diff --git a/sys/netipsec/xform_tcp.c b/sys/netipsec/xform_tcp.c > > > > index b53544cd00fb..ce2552f0a205 100644 > > > > --- a/sys/netipsec/xform_tcp.c > > > > +++ b/sys/netipsec/xform_tcp.c > > > > @@ -269,6 +269,11 @@ tcp_ipsec_input(struct mbuf *m, struct tcphdr > *th, > > > u_char *buf) > > > > KMOD_TCPSTAT_INC(tcps_sig_err_buildsig); > > > > return (ENOENT); > > > > } > > > > + if (buf =3D=3D NULL) { > > > > + key_freesav(&sav); > > > > + KMOD_TCPSTAT_INC(tcps_sig_err_nosigopt); > > > > + return (EACCES); > > > > + } > > > > /* > > > > * tcp_input() operates with TCP header fields in host > > > > * byte order. We expect them in network byte order. > > > > --0000000000007a3ef705d58edcb7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">= <div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jan 12, 2022 at 1:27 PM Mike = Karels <<a href=3D"mailto:mike@karels.net">mike@karels.net</a>> wrote= :<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.= 8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Rob wrote:<br>= > For what it's worth, this behavior is consistent with OpenBSD.<br> <br> That's a useful data point, thanks.<br></blockquote><div><br></div><div= >There is value in having the same semantics as OpenBSD for the <a href=3D"= https://man.openbsd.org/tcp.4">TCP_MD5SIG option</a>.</div><div><br></div><= div>If OpenBSD's semantics of the TCP_MD5SIG option were different, I l= ikely would have taken a different approach. And also given that FreeBSD an= d OpenBSD's TCP_MD5SIG option had the same behavior until we diverged i= n 2017.<br></div><div><br></div><div>..that's how I ended up going in t= his direction<br></div><div><br></div><div>-Rob<br></div><div>=C2=A0</div><= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex"> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Mike<br> <br> > -Rob<br> <br> <br> > ><br> > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Mike= <br> > ><br> > > On 8 Jan 2022, at 19:45, Robert Wing wrote:<br> > ><br> > > > The branch main has been updated by rew:<br> > > ><br> > > > URL:<br> > > <a href=3D"https://cgit.FreeBSD.org/src/commit/?id=3D3Deb18708ec8= c7e1de6a05aba41971659=3D" rel=3D"noreferrer" target=3D"_blank">https://cgit= .FreeBSD.org/src/commit/?id=3D3Deb18708ec8c7e1de6a05aba41971659=3D</a><br> > 549991b10<br> > > ><br> > > > commit eb18708ec8c7e1de6a05aba41971659549991b10<br> > > > Author:=C2=A0 =C2=A0 =C2=A0Robert Wing <rew@FreeBSD.org&g= t;<br> > > > AuthorDate: 2022-01-09 01:07:50 +0000<br> > > > Commit:=C2=A0 =C2=A0 =C2=A0Robert Wing <rew@FreeBSD.org&g= t;<br> > > > CommitDate: 2022-01-09 01:32:14 +0000<br> > > ><br> > > >=C2=A0 =C2=A0 =C2=A0syncache: accept packet with no SA when T= CP_MD5SIG is set<br> > > ><br> > > >=C2=A0 =C2=A0 =C2=A0When TCP_MD5SIG is set on a socket, all p= ackets are dropped that<br> > > don't<br> > > >=C2=A0 =C2=A0 =C2=A0contain an MD5 signature. Relax this beha= vior to accept a non-signe=3D<br> > d<br> > > >=C2=A0 =C2=A0 =C2=A0packet when a security association doesn&= #39;t exist with the peer.<br> > > ><br> > > >=C2=A0 =C2=A0 =C2=A0This is useful when a listen socket set w= ith TCP_MD5SIG wants to<br> > > handle<br> > > >=C2=A0 =C2=A0 =C2=A0connections protected with and without MD= 5 signatures.<br> > > ><br> > > >=C2=A0 =C2=A0 =C2=A0Reviewed by:=C2=A0 =C2=A0 bz (previous ve= rsion)<br> > > >=C2=A0 =C2=A0 =C2=A0Sponsored by:=C2=A0 =C2=A0<a href=3D"http= ://nepustil.net" rel=3D"noreferrer" target=3D"_blank">nepustil.net</a><br> > > >=C2=A0 =C2=A0 =C2=A0Sponsored by:=C2=A0 =C2=A0Klara Inc.<br> > > >=C2=A0 =C2=A0 =C2=A0Differential Revision:=C2=A0 <a href=3D"h= ttps://reviews.freebsd.org/D33227" rel=3D"noreferrer" target=3D"_blank">htt= ps://reviews.freebsd.org/D33227</a><br> > > > ---<br> > > >=C2=A0 share/man/man4/tcp.4=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0= 6 +++++-<br> > > >=C2=A0 sys/netinet/tcp_syncache.c | 30 ++++++++++++++++++----= --------<br> > > >=C2=A0 sys/netipsec/xform_tcp.c=C2=A0 =C2=A0|=C2=A0 5 +++++<b= r> > > >=C2=A0 3 files changed, 28 insertions(+), 13 deletions(-)<br> > > ><br> > > > diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4<br> > > > index 17138fa224ba..d103293132ba 100644<br> > > > --- a/share/man/man4/tcp.4<br> > > > +++ b/share/man/man4/tcp.4<br> > > > @@ -34,7 +34,7 @@<br> > > >=C2=A0 .\"=C2=A0 =C2=A0 =C2=A0From: @(#)tcp.4=C2=A0 =C2= =A0 =C2=A0 8.1 (Berkeley) 6/5/93<br> > > >=C2=A0 .\" $FreeBSD$<br> > > >=C2=A0 .\"<br> > > > -.Dd June 27, 2021<br> > > > +.Dd January 8, 2022<br> > > >=C2=A0 .Dt TCP 4<br> > > >=C2=A0 .Os<br> > > >=C2=A0 .Sh NAME<br> > > > @@ -339,6 +339,10 @@ This entry can only be specified on a p= er-host<br> > > basis at this time.<br> > > >=C2=A0 .Pp<br> > > >=C2=A0 If an SADB entry cannot be found for the destination,<= br> > > >=C2=A0 the system does not send any outgoing segments and dro= ps any inbound<br> > > segments.<br> > > > +However, during connection negotiation, a non-signed segmen= t will be<br> > > accepted if<br> > > > +an SADB entry does not exist between hosts.<br> > > > +When a non-signed segment is accepted, the established conn= ection is n=3D<br> > ot<br> > > > +protected with MD5 digests.<br> > > >=C2=A0 .It Dv TCP_STATS<br> > > >=C2=A0 Manage collection of connection level statistics using= the<br> > > >=C2=A0 .Xr stats 3<br> > > > diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_sy= ncache.c<br> > > > index 7dd8443cad65..32ca3bc2209b 100644<br> > > > --- a/sys/netinet/tcp_syncache.c<br> > > > +++ b/sys/netinet/tcp_syncache.c<br> > > > @@ -1514,19 +1514,25 @@ syncache_add(struct in_conninfo *inc= , struct<br> > > tcpopt *to, struct tcphdr *th,<br> > > ><br> > > >=C2=A0 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)<b= r> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0/*<br> > > > -=C2=A0 =C2=A0 =C2=A0 * If listening socket requested TCP di= gests, check that received<br> > > > -=C2=A0 =C2=A0 =C2=A0 * SYN has signature and it is correct.= If signature doesn't matc=3D<br> > h<br> > > > -=C2=A0 =C2=A0 =C2=A0 * or TCP_SIGNATURE support isn't e= nabled, drop the packet.<br> > > > +=C2=A0 =C2=A0 =C2=A0 * When the socket is TCP-MD5 enabled c= heck that,<br> > > > +=C2=A0 =C2=A0 =C2=A0 *=C2=A0 - a signed packet is valid<br> > > > +=C2=A0 =C2=A0 =C2=A0 *=C2=A0 - a non-signed packet does not= have a security association<br> > > > +=C2=A0 =C2=A0 =C2=A0 *<br> > > > +=C2=A0 =C2=A0 =C2=A0 *=C2=A0 If a signed packet fails valid= ation or a non-signed packet ha=3D<br> > s<br> > > a<br> > > > +=C2=A0 =C2=A0 =C2=A0 *=C2=A0 security association, the pack= et will be dropped.<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 */<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0if (ltflags & TF_SIGNATURE) {<= br> > > > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if ((to->= ;to_flags & TOF_SIGNATURE) =3D3D=3D3D 0) {<br> > > > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0TCPSTAT_INC(tcps_sig_err_nosigopt);<br> > > > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0goto done;<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (to->= to_flags & TOF_SIGNATURE) {<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0if (!TCPMD5_ENABLED() ||<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0TCPMD5_INPUT(m, th, to->to_signature) != =3D3D 0)<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0goto done;<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0} else {<br= > > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0if (TCPMD5_ENABLED() &&<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0TCPMD5_INPUT(m, NULL, NULL) !=3D3D ENOENT)<b= r> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0goto done;<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}<br> > > > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (!TCPMD5= _ENABLED() ||<br> > > > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0TCPMD5_INPUT(m, th, to->to_signature) !=3D3D 0)<br> > > > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0goto done;<br> > > > -=C2=A0 =C2=A0 =C2=A0}<br> > > > +=C2=A0 =C2=A0 =C2=A0} else if (to->to_flags & TOF_SI= GNATURE)<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0goto done;<= br> > > >=C2=A0 #endif=C2=A0 =C2=A0 =C2=A0 =C2=A0/* TCP_SIGNATURE */<b= r> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0/*<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 * See if we already have an entry= for this connection.<br> > > > @@ -1724,11 +1730,11 @@ skip_alloc:<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0}<br> > > >=C2=A0 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)<b= r> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0/*<br> > > > -=C2=A0 =C2=A0 =C2=A0 * If listening socket requested TCP di= gests, flag this in the<br> > > > +=C2=A0 =C2=A0 =C2=A0 * If incoming packet has an MD5 signat= ure, flag this in the<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 * syncache so that syncache_respo= nd() will do the right thing<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 * with the SYN+ACK.<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 */<br> > > > -=C2=A0 =C2=A0 =C2=A0if (ltflags & TF_SIGNATURE)<br> > > > +=C2=A0 =C2=A0 =C2=A0if (to->to_flags & TOF_SIGNATURE= )<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0sc->= ;sc_flags |=3D3D SCF_SIGNATURE;<br> > > >=C2=A0 #endif=C2=A0 =C2=A0 =C2=A0 =C2=A0/* TCP_SIGNATURE */<b= r> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0if (to->to_flags & TOF_SACK= PERM)<br> > > > diff --git a/sys/netipsec/xform_tcp.c b/sys/netipsec/xform_t= cp.c<br> > > > index b53544cd00fb..ce2552f0a205 100644<br> > > > --- a/sys/netipsec/xform_tcp.c<br> > > > +++ b/sys/netipsec/xform_tcp.c<br> > > > @@ -269,6 +269,11 @@ tcp_ipsec_input(struct mbuf *m, struct = tcphdr *th,<br> > > u_char *buf)<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0KMOD_T= CPSTAT_INC(tcps_sig_err_buildsig);<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return= (ENOENT);<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0}<br> > > > +=C2=A0 =C2=A0 =C2=A0if (buf =3D3D=3D3D NULL) {<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0key_freesav= (&sav);<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0KMOD_TCPSTA= T_INC(tcps_sig_err_nosigopt);<br> > > > +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return (EAC= CES);<br> > > > +=C2=A0 =C2=A0 =C2=A0}<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0/*<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 * tcp_input() operates with TCP h= eader fields in host<br> > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 * byte order. We expect them in n= etwork byte order.<br> > ><br> </blockquote></div></div> --0000000000007a3ef705d58edcb7--
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