[NETNS][FRAGS]: Make the inet_frag_queue lookup work in namespaces.

Since fragment management code is consolidated, we cannot have the
pointer from inet_frag_queue to struct net, since we must know what
king of fragment this is.

So, I introduce the netns_frags structure. This one is currently
empty, but will be eventually filled with per-namespace
attributes. Each inet_frag_queue is tagged with this one.

The conntrack_reasm is not "netns-izated", so it has one static
netns_frags instance to keep working in init namespace.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 4 deletions

diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index d631631..18accd4 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -78,6 +78,7 @@ static struct inet_frags_ctl nf_frags_ctl __read_mostly = {
 };
 
 static struct inet_frags nf_frags;
+static struct netns_frags nf_init_frags;
 
 #ifdef CONFIG_SYSCTL
 struct ctl_table nf_ct_ipv6_sysctl_table[] = {
@@ -212,7 +213,7 @@ fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)
 	arg.dst = dst;
 	hash = ip6qhashfn(id, src, dst);
 
-	q = inet_frag_find(&nf_frags, &arg, hash);
+	q = inet_frag_find(&nf_init_frags, &nf_frags, &arg, hash);
 	if (q == NULL)
 		goto oom;
 
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 1815ff0..ab2d53b 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -234,7 +234,7 @@ out:
 }
 
 static __inline__ struct frag_queue *
-fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
+fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
 	struct inet6_dev *idev)
 {
 	struct inet_frag_queue *q;
@@ -246,7 +246,7 @@ fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
 	arg.dst = dst;
 	hash = ip6qhashfn(id, src, dst);
 
-	q = inet_frag_find(&ip6_frags, &arg, hash);
+	q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
 	if (q == NULL)
 		goto oom;
 
@@ -568,6 +568,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
 	struct frag_hdr *fhdr;
 	struct frag_queue *fq;
 	struct ipv6hdr *hdr = ipv6_hdr(skb);
+	struct net *net;
 
 	IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMREQDS);
 
@@ -598,10 +599,11 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
 		return 1;
 	}
 
+	net = skb->dev->nd_net;
 	if (atomic_read(&ip6_frags.mem) > init_net.ipv6.sysctl.frags.high_thresh)
 		ip6_evictor(ip6_dst_idev(skb->dst));
 
-	if ((fq = fq_find(fhdr->identification, &hdr->saddr, &hdr->daddr,
+	if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
 			  ip6_dst_idev(skb->dst))) != NULL) {
 		int ret;