From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Horman Subject: Re: [PATCH net] ipvs: use skb_to_full_sk() helper Date: Sat, 14 Nov 2015 21:49:37 +0900 Message-ID: <20151114124936.GB14569@verge.net.au> References: <06dc952f98f54da2c4d85b31e5fa9826@eikelenboom.it> <1447337353.22599.14.camel@edumazet-glaptop2.roam.corp.google.com> <1447348452.22599.28.camel@edumazet-glaptop2.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Eric Dumazet , Sander Eikelenboom , David Miller , netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, Wensong Zhang , lvs-devel@vger.kernel.org, Pablo Neira Ayuso To: David Miller , Julian Anastasov Return-path: Content-Disposition: inline In-Reply-To: Sender: lvs-devel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org [Attn Dave] [Cc Pablo] On Sat, Nov 14, 2015 at 01:37:46PM +0200, Julian Anastasov wrote: > > Hello, > > On Thu, 12 Nov 2015, Eric Dumazet wrote: > > > From: Eric Dumazet > > > > SYNACK packets might be attached to request sockets. > > > > Use skb_to_full_sk() helper to avoid illegal accesses to > > inet_sk(skb->sk) > > > > Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener") > > Signed-off-by: Eric Dumazet > > Reported-by: Sander Eikelenboom > > Looks good, I guess Simon will take the patch for > the ipvs tree. > > Acked-by: Julian Anastasov Dave, It looks like this patch has a compile-time dependency on 54abc686c2d1 ("net: add skb_to_full_sk() helper and use it in selinux_netlbl_skbuff_setsid()") which is currently present in net but not nf. The latter tree is the usual path for IPVS fixes. With the above in mind I think it would be easiest if you could pick this patch up directly and add it to net with: Acked-by: Simon Horman An alternative would be for Pablo to merge net into nf and for me to then prepare a pull request for him. But it seems a bit excessive for what otherwise appears to be a straightforward patch. > > --- > > net/netfilter/ipvs/ip_vs_core.c | 16 ++++++++-------- > > 1 file changed, 8 insertions(+), 8 deletions(-) > > > > diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c > > index 1e24fff53e4b..f57b4dcdb233 100644 > > --- a/net/netfilter/ipvs/ip_vs_core.c > > +++ b/net/netfilter/ipvs/ip_vs_core.c > > @@ -1176,6 +1176,7 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in > > struct ip_vs_protocol *pp; > > struct ip_vs_proto_data *pd; > > struct ip_vs_conn *cp; > > + struct sock *sk; > > > > EnterFunction(11); > > > > @@ -1183,13 +1184,12 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in > > if (skb->ipvs_property) > > return NF_ACCEPT; > > > > + sk = skb_to_full_sk(skb); > > /* Bad... Do not break raw sockets */ > > - if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && > > + if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT && > > af == AF_INET)) { > > - struct sock *sk = skb->sk; > > - struct inet_sock *inet = inet_sk(skb->sk); > > > > - if (inet && sk->sk_family == PF_INET && inet->nodefrag) > > + if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag) > > return NF_ACCEPT; > > } > > > > @@ -1681,6 +1681,7 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int > > struct ip_vs_conn *cp; > > int ret, pkts; > > int conn_reuse_mode; > > + struct sock *sk; > > > > /* Already marked as IPVS request or reply? */ > > if (skb->ipvs_property) > > @@ -1708,12 +1709,11 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int > > ip_vs_fill_iph_skb(af, skb, false, &iph); > > > > /* Bad... Do not break raw sockets */ > > - if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && > > + sk = skb_to_full_sk(skb); > > + if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT && > > af == AF_INET)) { > > - struct sock *sk = skb->sk; > > - struct inet_sock *inet = inet_sk(skb->sk); > > > > - if (inet && sk->sk_family == PF_INET && inet->nodefrag) > > + if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag) > > return NF_ACCEPT; > > } > > Regards > > -- > Julian Anastasov >