Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says: ==================== Netfilter fixes for net-next The following batch contains a couple of fixes to address some fallout from the previous pull request, they are: 1) Address link problems in the bridge code after e5de75b. Fix it by using rcu hook to address to avoid ifdef pollution and hard dependency between bridge and br_netfilter. 2) Address sparse warnings in the netfilter reject code, patch from Florian Westphal. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Mar 10, 2015 · 515fb5c · 515fb5c
2 parents 59e33c2 + 1a4ba64
commit 515fb5c
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Showing 8 changed files with 23 additions and 13 deletions.
diff --git a/include/net/netfilter/ipv4/nf_reject.h b/include/net/netfilter/ipv4/nf_reject.h
@@ -12,7 +12,7 @@ const struct tcphdr *nf_reject_ip_tcphdr_get(struct sk_buff *oldskb,
 					     struct tcphdr *_oth, int hook);
 struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
 				  const struct sk_buff *oldskb,
-				  __be16 protocol, int ttl);
+				  __u8 protocol, int ttl);
 void nf_reject_ip_tcphdr_put(struct sk_buff *nskb, const struct sk_buff *oldskb,
 			     const struct tcphdr *oth);
 

diff --git a/include/net/netfilter/ipv6/nf_reject.h b/include/net/netfilter/ipv6/nf_reject.h
@@ -13,7 +13,7 @@ const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
 					      unsigned int *otcplen, int hook);
 struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
 				     const struct sk_buff *oldskb,
-				     __be16 protocol, int hoplimit);
+				     __u8 protocol, int hoplimit);
 void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
 			      const struct sk_buff *oldskb,
 			      const struct tcphdr *oth, unsigned int otcplen);

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
@@ -25,6 +25,9 @@
 #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
 			 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
 
+const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
+EXPORT_SYMBOL_GPL(nf_br_ops);
+
 /* net device transmit always called with BH disabled */
 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 {
@@ -33,10 +36,12 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct net_bridge_fdb_entry *dst;
 	struct net_bridge_mdb_entry *mdst;
 	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
+	const struct nf_br_ops *nf_ops;
 	u16 vid = 0;
 
 	rcu_read_lock();
-	if (br_nf_prerouting_finish_bridge(skb)) {
+	nf_ops = rcu_dereference(nf_br_ops);
+	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
 		rcu_read_unlock();
 		return NETDEV_TX_OK;
 	}

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
@@ -914,15 +914,18 @@ static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
 	br_handle_frame_finish(skb);
 }
 
-int br_nf_prerouting_finish_bridge(struct sk_buff *skb)
+static int br_nf_dev_xmit(struct sk_buff *skb)
 {
 	if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
 		br_nf_pre_routing_finish_bridge_slow(skb);
 		return 1;
 	}
 	return 0;
 }
-EXPORT_SYMBOL_GPL(br_nf_prerouting_finish_bridge);
+
+static const struct nf_br_ops br_ops = {
+	.br_dev_xmit_hook =	br_nf_dev_xmit,
+};
 
 void br_netfilter_enable(void)
 {
@@ -1061,12 +1064,14 @@ static int __init br_netfilter_init(void)
 		return -ENOMEM;
 	}
 #endif
+	RCU_INIT_POINTER(nf_br_ops, &br_ops);
 	printk(KERN_NOTICE "Bridge firewalling registered\n");
 	return 0;
 }
 
 static void __exit br_netfilter_fini(void)
 {
+	RCU_INIT_POINTER(nf_br_ops, NULL);
 	nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
 #ifdef CONFIG_SYSCTL
 	unregister_net_sysctl_table(brnf_sysctl_header);

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
@@ -763,17 +763,17 @@ static inline int br_vlan_enabled(struct net_bridge *br)
 }
 #endif
 
+struct nf_br_ops {
+	int (*br_dev_xmit_hook)(struct sk_buff *skb);
+};
+extern const struct nf_br_ops __rcu *nf_br_ops;
+
 /* br_netfilter.c */
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
-int br_nf_prerouting_finish_bridge(struct sk_buff *skb);
 int br_nf_core_init(void);
 void br_nf_core_fini(void);
 void br_netfilter_rtable_init(struct net_bridge *);
 #else
-static inline int br_nf_prerouting_finish_bridge(struct sk_buff *skb)
-{
-        return 0;
-}
 static inline int br_nf_core_init(void) { return 0; }
 static inline void br_nf_core_fini(void) {}
 #define br_netfilter_rtable_init(x)

diff --git a/net/bridge/netfilter/nft_reject_bridge.c b/net/bridge/netfilter/nft_reject_bridge.c
@@ -99,7 +99,7 @@ static void nft_reject_br_send_v4_unreach(struct sk_buff *oldskb,
 	if (!pskb_may_pull(oldskb, len))
 		return;
 
-	if (pskb_trim_rcsum(oldskb, htons(ip_hdr(oldskb)->tot_len)))
+	if (pskb_trim_rcsum(oldskb, ntohs(ip_hdr(oldskb)->tot_len)))
 		return;
 
 	if (ip_hdr(oldskb)->protocol == IPPROTO_TCP ||

diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c
@@ -43,7 +43,7 @@ EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_get);
 
 struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
 				  const struct sk_buff *oldskb,
-				  __be16 protocol, int ttl)
+				  __u8 protocol, int ttl)
 {
 	struct iphdr *niph, *oiph = ip_hdr(oldskb);
 

diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -65,7 +65,7 @@ EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_get);
 
 struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
 				     const struct sk_buff *oldskb,
-				     __be16 protocol, int hoplimit)
+				     __u8 protocol, int hoplimit)
 {
 	struct ipv6hdr *ip6h;
 	const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);