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Date: Thu, 5 Aug 2010 07:53:04 +0800
From: Changli Gao <xiaosuo@...il.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
"Pekka Savola (ipv6)" <pekkas@...core.fi>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>,
Stephen Hemminger <shemminger@...tta.com>,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] net: use the nf_bridge of the last received skb in a fragment queue
As we don't hold references to net devices in nf_bridge_info to prevent the
net devices go, we should always use the nf_bridge of the last received skb
in a fragment queue.
Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
net/ipv4/ip_fragment.c | 11 ++++++++---
net/ipv6/netfilter/nf_conntrack_reasm.c | 10 ++++++++--
net/ipv6/reassembly.c | 11 ++++++++---
3 files changed, 24 insertions(+), 8 deletions(-)
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index b7c4165..cd0a630 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -88,7 +88,7 @@ int ip_frag_mem(struct net *net)
}
static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
- struct net_device *dev);
+ struct net_device *dev, struct sk_buff *curr);
struct ip4_create_arg {
struct iphdr *iph;
@@ -478,7 +478,7 @@ found:
if (qp->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
qp->q.meat == qp->q.len)
- return ip_frag_reasm(qp, prev, dev);
+ return ip_frag_reasm(qp, prev, dev, skb);
write_lock(&ip4_frags.lock);
list_move_tail(&qp->q.lru_list, &qp->q.net->lru_list);
@@ -494,7 +494,7 @@ err:
/* Build a new IP datagram from all its fragments. */
static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
- struct net_device *dev)
+ struct net_device *dev, struct sk_buff *curr)
{
struct net *net = container_of(qp->q.net, struct net, ipv4.frags);
struct iphdr *iph;
@@ -579,6 +579,11 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
head->next = NULL;
head->dev = dev;
head->tstamp = qp->q.stamp;
+#ifdef CONFIG_BRIDGE_NETFILTER
+ nf_bridge_get(curr->nf_bridge);
+ nf_bridge_put(head->nf_bridge);
+ head->nf_bridge = curr->nf_bridge;
+#endif
iph = ip_hdr(head);
iph->frag_off = 0;
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 098a050..b5afad3 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -385,7 +385,8 @@ err:
* the last and the first frames arrived and all the bits are here.
*/
static struct sk_buff *
-nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
+nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev,
+ struct sk_buff *curr)
{
struct sk_buff *fp, *op, *head = fq->q.fragments;
int payload_len;
@@ -464,6 +465,11 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
head->dev = dev;
head->tstamp = fq->q.stamp;
ipv6_hdr(head)->payload_len = htons(payload_len);
+#ifdef CONFIG_BRIDGE_NETFILTER
+ nf_bridge_get(curr->nf_bridge);
+ nf_bridge_put(head->nf_bridge);
+ head->nf_bridge = curr->nf_bridge;
+#endif
/* Yes, and fold redundant checksum back. 8) */
if (head->ip_summed == CHECKSUM_COMPLETE)
@@ -622,7 +628,7 @@ struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user)
if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
fq->q.meat == fq->q.len) {
- ret_skb = nf_ct_frag6_reasm(fq, dev);
+ ret_skb = nf_ct_frag6_reasm(fq, dev, clone);
if (ret_skb == NULL)
pr_debug("Can't reassemble fragmented packets\n");
}
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 545c414..9ea4308 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -95,7 +95,7 @@ int ip6_frag_mem(struct net *net)
}
static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
- struct net_device *dev);
+ struct net_device *dev, struct sk_buff *curr);
/*
* callers should be careful not to use the hash value outside the ipfrag_lock
@@ -429,7 +429,7 @@ found:
if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
fq->q.meat == fq->q.len)
- return ip6_frag_reasm(fq, prev, dev);
+ return ip6_frag_reasm(fq, prev, dev, skb);
write_lock(&ip6_frags.lock);
list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
@@ -453,7 +453,7 @@ err:
* the last and the first frames arrived and all the bits are here.
*/
static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
- struct net_device *dev)
+ struct net_device *dev, struct sk_buff *curr)
{
struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
struct sk_buff *fp, *head = fq->q.fragments;
@@ -548,6 +548,11 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
head->tstamp = fq->q.stamp;
ipv6_hdr(head)->payload_len = htons(payload_len);
IP6CB(head)->nhoff = nhoff;
+#ifdef CONFIG_BRIDGE_NETFILTER
+ nf_bridge_get(curr->nf_bridge);
+ nf_bridge_put(head->nf_bridge);
+ head->nf_bridge = curr->nf_bridge;
+#endif
/* Yes, and fold redundant checksum back. 8) */
if (head->ip_summed == CHECKSUM_COMPLETE)
--
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