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Commit fc38582d authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: bridge netfilter: consolidate header pushing/pulling code 



Consolidate the common push/pull sequences into a few helper functions.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cfd6c380

include/linux/netfilter_bridge.h

+16 −9
Original line number Diff line number Diff line
@@ -55,18 +55,25 @@ static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb) 
  	return 0;

}



static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)

{

	switch (skb->protocol) {

	case __constant_htons(ETH_P_8021Q):

		return VLAN_HLEN;

	case __constant_htons(ETH_P_PPP_SES):

		return PPPOE_SES_HLEN;

	default:

		return 0;

	}

}



/* This is called by the IP fragmenting code and it ensures there is

 * enough room for the encapsulating header (if there is one). */

static inline int nf_bridge_pad(const struct sk_buff *skb)

static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)

{

	int padding = 0;



	if (skb->nf_bridge && skb->protocol == htons(ETH_P_8021Q))

		padding = VLAN_HLEN;

	else if (skb->nf_bridge && skb->protocol == htons(ETH_P_PPP_SES))

		padding = PPPOE_SES_HLEN;



	return padding;

	if (skb->nf_bridge)

		return nf_bridge_encap_header_len(skb);

	return 0;

}



struct bridge_skb_cb {

net/bridge/br_netfilter.c

+40 −98
Original line number Diff line number Diff line
@@ -142,14 +142,33 @@ static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) 
	return skb->nf_bridge;

}



static inline void nf_bridge_save_header(struct sk_buff *skb)

static inline void nf_bridge_push_encap_header(struct sk_buff *skb)

{

	unsigned int len = nf_bridge_encap_header_len(skb);



	skb_push(skb, len);

	skb->network_header -= len;

}



static inline void nf_bridge_pull_encap_header(struct sk_buff *skb)

{

	int header_size = ETH_HLEN;

	unsigned int len = nf_bridge_encap_header_len(skb);



	skb_pull(skb, len);

	skb->network_header += len;

}



	if (skb->protocol == htons(ETH_P_8021Q))

		header_size += VLAN_HLEN;

	else if (skb->protocol == htons(ETH_P_PPP_SES))

		header_size += PPPOE_SES_HLEN;

static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb)

{

	unsigned int len = nf_bridge_encap_header_len(skb);



	skb_pull_rcsum(skb, len);

	skb->network_header += len;

}



static inline void nf_bridge_save_header(struct sk_buff *skb)

{

	int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb);



	skb_copy_from_linear_data_offset(skb, -header_size,

					 skb->nf_bridge->data, header_size);
@@ -162,12 +181,7 @@ static inline void nf_bridge_save_header(struct sk_buff *skb) 
int nf_bridge_copy_header(struct sk_buff *skb)

{

	int err;

	int header_size = ETH_HLEN;



	if (skb->protocol == htons(ETH_P_8021Q))

		header_size += VLAN_HLEN;

	else if (skb->protocol == htons(ETH_P_PPP_SES))

		header_size += PPPOE_SES_HLEN;

	int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb);



	err = skb_cow(skb, header_size);

	if (err)
@@ -175,11 +189,7 @@ int nf_bridge_copy_header(struct sk_buff *skb) 


	skb_copy_to_linear_data_offset(skb, -header_size,

				       skb->nf_bridge->data, header_size);



	if (skb->protocol == htons(ETH_P_8021Q))

		__skb_push(skb, VLAN_HLEN);

	else if (skb->protocol == htons(ETH_P_PPP_SES))

		__skb_push(skb, PPPOE_SES_HLEN);

	__skb_push(skb, nf_bridge_encap_header_len(skb));

	return 0;

}
@@ -200,13 +210,7 @@ static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) 
	dst_hold(skb->dst);



	skb->dev = nf_bridge->physindev;

	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_push(skb, VLAN_HLEN);

		skb->network_header -= VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_push(skb, PPPOE_SES_HLEN);

		skb->network_header -= PPPOE_SES_HLEN;

	}

	nf_bridge_push_encap_header(skb);

	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,

		       br_handle_frame_finish, 1);
@@ -284,13 +288,7 @@ static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) 
	if (!skb->dev)

		kfree_skb(skb);

	else {

		if (skb->protocol == htons(ETH_P_8021Q)) {

			skb_pull(skb, VLAN_HLEN);

			skb->network_header += VLAN_HLEN;

		} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

			skb_pull(skb, PPPOE_SES_HLEN);

			skb->network_header += PPPOE_SES_HLEN;

		}

		nf_bridge_pull_encap_header(skb);

		skb->dst->output(skb);

	}

	return 0;
@@ -356,15 +354,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb) 
				 * bridged frame */

				nf_bridge->mask |= BRNF_BRIDGED_DNAT;

				skb->dev = nf_bridge->physindev;

				if (skb->protocol ==

				    htons(ETH_P_8021Q)) {

					skb_push(skb, VLAN_HLEN);

					skb->network_header -= VLAN_HLEN;

				} else if(skb->protocol ==

				    htons(ETH_P_PPP_SES)) {

					skb_push(skb, PPPOE_SES_HLEN);

					skb->network_header -= PPPOE_SES_HLEN;

				}

				nf_bridge_push_encap_header(skb);

				NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,

					       skb, skb->dev, NULL,

					       br_nf_pre_routing_finish_bridge,
@@ -380,13 +370,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb) 
	}



	skb->dev = nf_bridge->physindev;

	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_push(skb, VLAN_HLEN);

		skb->network_header -= VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_push(skb, PPPOE_SES_HLEN);

		skb->network_header -= PPPOE_SES_HLEN;

	}

	nf_bridge_push_encap_header(skb);

	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,

		       br_handle_frame_finish, 1);
@@ -536,14 +520,7 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, 
#endif

		if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)

			goto out;



		if (skb->protocol == htons(ETH_P_8021Q)) {

			skb_pull_rcsum(skb, VLAN_HLEN);

			skb->network_header += VLAN_HLEN;

		} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

			skb_pull_rcsum(skb, PPPOE_SES_HLEN);

			skb->network_header += PPPOE_SES_HLEN;

		}

		nf_bridge_pull_encap_header_rcsum(skb);

		return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);

	}

#ifdef CONFIG_SYSCTL
@@ -557,14 +534,7 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, 


	if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)

		goto out;



	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_pull_rcsum(skb, VLAN_HLEN);

		skb->network_header += VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_pull_rcsum(skb, PPPOE_SES_HLEN);

		skb->network_header += PPPOE_SES_HLEN;

	}

	nf_bridge_pull_encap_header_rcsum(skb);



	if (!pskb_may_pull(skb, sizeof(struct iphdr)))

		goto inhdr_error;
@@ -642,13 +612,7 @@ static int br_nf_forward_finish(struct sk_buff *skb) 
	} else {

		in = *((struct net_device **)(skb->cb));

	}

	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_push(skb, VLAN_HLEN);

		skb->network_header -= VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_push(skb, PPPOE_SES_HLEN);

		skb->network_header -= PPPOE_SES_HLEN;

	}

	nf_bridge_push_encap_header(skb);

	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,

		       skb->dev, br_forward_finish, 1);

	return 0;
@@ -682,13 +646,7 @@ static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb, 
	else

		pf = PF_INET6;



	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_pull(*pskb, VLAN_HLEN);

		(*pskb)->network_header += VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_pull(*pskb, PPPOE_SES_HLEN);

		(*pskb)->network_header += PPPOE_SES_HLEN;

	}

	nf_bridge_pull_encap_header(*pskb);



	nf_bridge = skb->nf_bridge;

	if (skb->pkt_type == PACKET_OTHERHOST) {
@@ -722,15 +680,12 @@ static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb, 
	if (skb->protocol != htons(ETH_P_ARP)) {

		if (!IS_VLAN_ARP(skb))

			return NF_ACCEPT;

		skb_pull(*pskb, VLAN_HLEN);

		(*pskb)->network_header += VLAN_HLEN;

		nf_bridge_pull_encap_header(*pskb);

	}



	if (arp_hdr(skb)->ar_pln != 4) {

		if (IS_VLAN_ARP(skb)) {

			skb_push(*pskb, VLAN_HLEN);

			(*pskb)->network_header -= VLAN_HLEN;

		}

		if (IS_VLAN_ARP(skb))

			nf_bridge_push_encap_header(*pskb);

		return NF_ACCEPT;

	}

	*d = (struct net_device *)in;
@@ -777,13 +732,7 @@ static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb, 
		skb->pkt_type = PACKET_OTHERHOST;

		nf_bridge->mask ^= BRNF_PKT_TYPE;

	}

	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_push(skb, VLAN_HLEN);

		skb->network_header -= VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_push(skb, PPPOE_SES_HLEN);

		skb->network_header -= PPPOE_SES_HLEN;

	}

	nf_bridge_push_encap_header(skb);



	NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev,

		br_forward_finish);
@@ -848,14 +797,7 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, 
		nf_bridge->mask |= BRNF_PKT_TYPE;

	}



	if (skb->protocol == htons(ETH_P_8021Q)) {

		skb_pull(skb, VLAN_HLEN);

		skb->network_header += VLAN_HLEN;

	} else if (skb->protocol == htons(ETH_P_PPP_SES)) {

		skb_pull(skb, PPPOE_SES_HLEN);

		skb->network_header += PPPOE_SES_HLEN;

	}



	nf_bridge_pull_encap_header(skb);

	nf_bridge_save_header(skb);



#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)