Skip to content

L
linux
Commit 420788a6 authored by Bart De Schuymer's avatar Bart De Schuymer Committed by David S. Miller
Browse files
Options

[BRIDGE]: Let {ip,arp}tables see bridged VLAN packets.

parent 4044a3f8
Show whitespace changes
Inline Side-by-side
Showing with 158 additions and 29 deletions
include/linux/netfilter_bridge.h
View file @ 420788a6
......@@ -8,6 +8,9 @@
#include <linux/netfilter.h>
#if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
#include <asm/atomic.h>
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
#include <linux/if_ether.h>
#endif
#endif
/* Bridge Hooks */
......@@ -44,6 +47,7 @@ enum nf_br_hook_priorities {
#define BRNF_BRIDGED_DNAT 0x02
#define BRNF_DONT_TAKE_PARENT 0x04
#define BRNF_BRIDGED 0x08
#define BRNF_NF_BRIDGE_PREROUTING 0x10
static inline
struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
......@@ -54,11 +58,41 @@ struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
atomic_set(&(*nf_bridge)->use, 1);
(*nf_bridge)->mask = 0;
(*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
(*nf_bridge)->netoutdev = NULL;
#endif
}
return *nf_bridge;
}
/* Only used in br_forward.c */
static inline
void nf_bridge_maybe_copy_header(struct sk_buff *skb)
{
if (skb->nf_bridge) {
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
memcpy(skb->data - 18, skb->nf_bridge->hh, 18);
skb_push(skb, 4);
} else
#endif
memcpy(skb->data - 16, skb->nf_bridge->hh, 16);
}
}
static inline
void nf_bridge_save_header(struct sk_buff *skb)
{
int header_size = 16;
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
if (skb->protocol == __constant_htons(ETH_P_8021Q))
header_size = 18;
#endif
memcpy(skb->nf_bridge->hh, skb->data - header_size, header_size);
}
struct bridge_skb_cb {
union {
__u32 ipv4;
......
include/linux/skbuff.h
View file @ 420788a6
......@@ -103,8 +103,11 @@ struct nf_bridge_info {
atomic_t use;
struct net_device *physindev;
struct net_device *physoutdev;
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
struct net_device *netoutdev;
#endif
unsigned int mask;
unsigned long hh[16 / sizeof(unsigned long)];
unsigned long hh[32 / sizeof(unsigned long)];
};
#endif
......
net/8021q/vlan_dev.c
View file @ 420788a6
......@@ -502,6 +502,10 @@ int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
stats->tx_packets++; /* for statics only */
stats->tx_bytes += skb->len;
skb->protocol = __constant_htons(ETH_P_8021Q);
skb->mac.raw -= VLAN_HLEN;
skb->nh.raw -= VLAN_HLEN;
dev_queue_xmit(skb);
return 0;
......
net/bridge/br_forward.c
View file @ 420788a6
......@@ -35,8 +35,7 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
{
#ifdef CONFIG_BRIDGE_NETFILTER
/* ip_refrag calls ip_fragment, which doesn't copy the MAC header. */
if (skb->nf_bridge)
memcpy(skb->data - 16, skb->nf_bridge->hh, 16);
nf_bridge_maybe_copy_header(skb);
#endif
skb_push(skb, ETH_HLEN);
......
net/bridge/br_netfilter.c
View file @ 420788a6
......@@ -4,7 +4,13 @@
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
* Bart De Schuymer <bdschuym@pandora.be>
* Bart De Schuymer (maintainer) <bdschuym@pandora.be>
*
* Changes:
* Apr 29 2003: physdev module support (bdschuym)
* Jun 19 2003: let arptables see bridged ARP traffic (bdschuym)
* Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge
* (bdschuym)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
......@@ -20,6 +26,7 @@
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_arp.h>
......@@ -40,6 +47,11 @@
#define has_bridge_parent(device) ((device)->br_port != NULL)
#define bridge_parent(device) ((device)->br_port->br->dev)
#define IS_VLAN_IP (skb->protocol == __constant_htons(ETH_P_8021Q) && \
hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IP))
#define IS_VLAN_ARP (skb->protocol == __constant_htons(ETH_P_8021Q) && \
hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_ARP))
/* We need these fake structures to make netfilter happy --
* lots of places assume that skb->dst != NULL, which isn't
* all that unreasonable.
......@@ -135,8 +147,13 @@ static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
skb->pkt_type = PACKET_HOST;
skb->nf_bridge->mask |= BRNF_PKT_TYPE;
}
skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
skb->dev = bridge_parent(skb->dev);
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
skb_pull(skb, VLAN_HLEN);
skb->nh.raw += VLAN_HLEN;
}
skb->dst->output(skb);
return 0;
}
......@@ -155,6 +172,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
skb->pkt_type = PACKET_OTHERHOST;
nf_bridge->mask ^= BRNF_PKT_TYPE;
}
nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
if (dnat_took_place(skb)) {
if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
......@@ -186,6 +204,11 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
nf_bridge->mask |= BRNF_BRIDGED_DNAT;
skb->dev = nf_bridge->physindev;
clear_cb(skb);
if (skb->protocol ==
__constant_htons(ETH_P_8021Q)) {
skb_push(skb, VLAN_HLEN);
skb->nh.raw -= VLAN_HLEN;
}
NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
skb, skb->dev, NULL,
br_nf_pre_routing_finish_bridge,
......@@ -202,6 +225,10 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
clear_cb(skb);
skb->dev = nf_bridge->physindev;
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
skb_push(skb, VLAN_HLEN);
skb->nh.raw -= VLAN_HLEN;
}
NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish, 1);
......@@ -220,14 +247,21 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
{
struct iphdr *iph;
__u32 len;
struct sk_buff *skb;
struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge;
if ((*pskb)->protocol != __constant_htons(ETH_P_IP))
return NF_ACCEPT;
if (skb->protocol != __constant_htons(ETH_P_IP)) {
struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)
((*pskb)->mac.ethernet);
if (!IS_VLAN_IP)
return NF_ACCEPT;
if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
goto out;
skb_pull(*pskb, VLAN_HLEN);
(*pskb)->nh.raw += VLAN_HLEN;
} else if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
goto out;
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto inhdr_error;
......@@ -264,6 +298,7 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
nf_bridge->mask |= BRNF_PKT_TYPE;
}
nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
nf_bridge->physindev = skb->dev;
skb->dev = bridge_parent(skb->dev);
store_orig_dstaddr(skb);
......@@ -294,9 +329,6 @@ static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
{
struct sk_buff *skb = *pskb;
if (skb->protocol != __constant_htons(ETH_P_IP))
return NF_ACCEPT;
if (skb->dst == (struct dst_entry *)&__fake_rtable) {
dst_release(skb->dst);
skb->dst = NULL;
......@@ -310,12 +342,13 @@ static int br_nf_forward_finish(struct sk_buff *skb)
{
struct nf_bridge_info *nf_bridge = skb->nf_bridge;
struct net_device *in;
struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
#ifdef CONFIG_NETFILTER_DEBUG
skb->nf_debug ^= (1 << NF_BR_FORWARD);
#endif
if (skb->protocol == __constant_htons(ETH_P_IP)) {
if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) {
in = nf_bridge->physindev;
if (nf_bridge->mask & BRNF_PKT_TYPE) {
skb->pkt_type = PACKET_OTHERHOST;
......@@ -324,7 +357,10 @@ static int br_nf_forward_finish(struct sk_buff *skb)
} else {
in = *((struct net_device **)(skb->cb));
}
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
skb_push(skb, VLAN_HLEN);
skb->nh.raw -= VLAN_HLEN;
}
NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,
skb->dev, br_forward_finish, 1);
return 0;
......@@ -342,15 +378,20 @@ static unsigned int br_nf_forward(unsigned int hook, struct sk_buff **pskb,
{
struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge;
struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
if (skb->protocol != __constant_htons(ETH_P_IP) &&
skb->protocol != __constant_htons(ETH_P_ARP))
skb->protocol != __constant_htons(ETH_P_ARP)) {
if (!IS_VLAN_IP && !IS_VLAN_ARP)
return NF_ACCEPT;
skb_pull(*pskb, VLAN_HLEN);
(*pskb)->nh.raw += VLAN_HLEN;
}
#ifdef CONFIG_NETFILTER_DEBUG
skb->nf_debug ^= (1 << NF_BR_FORWARD);
#endif
if (skb->protocol == __constant_htons(ETH_P_IP)) {
if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) {
nf_bridge = skb->nf_bridge;
if (skb->pkt_type == PACKET_OTHERHOST) {
skb->pkt_type = PACKET_HOST;
......@@ -365,7 +406,15 @@ static unsigned int br_nf_forward(unsigned int hook, struct sk_buff **pskb,
bridge_parent(out), br_nf_forward_finish);
} else {
struct net_device **d = (struct net_device **)(skb->cb);
struct arphdr *arp = skb->nh.arph;
if (arp->ar_pln != 4) {
if (IS_VLAN_ARP) {
skb_push(*pskb, VLAN_HLEN);
(*pskb)->nh.raw -= VLAN_HLEN;
}
return NF_ACCEPT;
}
*d = (struct net_device *)in;
NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in,
(struct net_device *)out, br_nf_forward_finish);
......@@ -381,6 +430,10 @@ static int br_nf_local_out_finish(struct sk_buff *skb)
#ifdef CONFIG_NETFILTER_DEBUG
skb->nf_debug &= ~(1 << NF_BR_LOCAL_OUT);
#endif
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
skb_push(skb, VLAN_HLEN);
skb->nh.raw -= VLAN_HLEN;
}
NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
br_forward_finish, NF_BR_PRI_FIRST + 1);
......@@ -419,8 +472,9 @@ static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
struct net_device *realindev;
struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge;
struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
if (skb->protocol != __constant_htons(ETH_P_IP))
if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP)
return NF_ACCEPT;
/* Sometimes we get packets with NULL ->dst here (for example,
......@@ -444,11 +498,26 @@ 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 == __constant_htons(ETH_P_8021Q)) {
skb_push(skb, VLAN_HLEN);
skb->nh.raw -= VLAN_HLEN;
}
NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
skb->dev, okfn);
} else {
struct net_device *realoutdev = bridge_parent(skb->dev);
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
/* iptables should match -o br0.x */
if (nf_bridge->netoutdev)
realoutdev = nf_bridge->netoutdev;
#endif
okfn = br_nf_local_out_finish;
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
skb_pull(skb, VLAN_HLEN);
(*pskb)->nh.raw += VLAN_HLEN;
}
/* IP forwarded traffic has a physindev, locally
* generated traffic hasn't.
*/
......@@ -456,9 +525,8 @@ static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
if (((nf_bridge->mask & BRNF_DONT_TAKE_PARENT) == 0) &&
has_bridge_parent(realindev))
realindev = bridge_parent(realindev);
NF_HOOK_THRESH(PF_INET, NF_IP_FORWARD, skb, realindev,
bridge_parent(skb->dev), okfn,
realoutdev, okfn,
NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1);
} else {
#ifdef CONFIG_NETFILTER_DEBUG
......@@ -466,7 +534,7 @@ static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
#endif
NF_HOOK_THRESH(PF_INET, NF_IP_LOCAL_OUT, skb, realindev,
bridge_parent(skb->dev), okfn,
realoutdev, okfn,
NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
}
}
......@@ -482,6 +550,8 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
{
struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
struct net_device *realoutdev = bridge_parent(skb->dev);
/* Be very paranoid. Must be a device driver bug. */
if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
......@@ -492,11 +562,11 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
if (has_bridge_parent(skb->dev))
printk("[%s]", bridge_parent(skb->dev)->name);
}
printk("\n");
printk(" head:%p, raw:%p\n", skb->head, skb->mac.raw);
return NF_ACCEPT;
}
if (skb->protocol != __constant_htons(ETH_P_IP))
if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP)
return NF_ACCEPT;
/* Sometimes we get packets with NULL ->dst here (for example,
......@@ -517,10 +587,19 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
nf_bridge->mask |= BRNF_PKT_TYPE;
}
memcpy(nf_bridge->hh, skb->data - 16, 16);
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
skb_pull(skb, VLAN_HLEN);
skb->nh.raw += VLAN_HLEN;
}
nf_bridge_save_header(skb);
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
if (nf_bridge->netoutdev)
realoutdev = nf_bridge->netoutdev;
#endif
NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL,
bridge_parent(skb->dev), br_dev_queue_push_xmit);
realoutdev, br_dev_queue_push_xmit);
return NF_STOLEN;
}
......@@ -535,8 +614,8 @@ static unsigned int ipv4_sabotage_in(unsigned int hook, struct sk_buff **pskb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
if (in->hard_start_xmit == br_dev_xmit &&
okfn != br_nf_pre_routing_finish) {
if ((*pskb)->nf_bridge &&
!((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
okfn(*pskb);
return NF_STOLEN;
}
......@@ -552,10 +631,15 @@ static unsigned int ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
if (out->hard_start_xmit == br_dev_xmit &&
if ((out->hard_start_xmit == br_dev_xmit &&
okfn != br_nf_forward_finish &&
okfn != br_nf_local_out_finish &&
okfn != br_dev_queue_push_xmit) {
okfn != br_dev_queue_push_xmit)
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|| ((out->priv_flags & IFF_802_1Q_VLAN) &&
VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit)
#endif
) {
struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge;
......@@ -574,6 +658,11 @@ static unsigned int ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb,
nf_bridge->mask &= BRNF_DONT_TAKE_PARENT;
nf_bridge->physindev = (struct net_device *)in;
}
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
/* the iptables outdev is br0.x, not br0 */
if (out->priv_flags & IFF_802_1Q_VLAN)
nf_bridge->netoutdev = (struct net_device *)out;
#endif
okfn(skb);
return NF_STOLEN;
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7