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-rw-r--r--Documentation/networking/ip-sysctl.txt7
-rw-r--r--include/linux/if_pppox.h3
-rw-r--r--include/linux/netfilter_bridge.h11
-rw-r--r--include/linux/sysctl.h1
-rw-r--r--net/bridge/br_netfilter.c77
5 files changed, 92 insertions, 7 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 054c515bd72..af6a63ab902 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1015,7 +1015,12 @@ bridge-nf-call-ip6tables - BOOLEAN
Default: 1
bridge-nf-filter-vlan-tagged - BOOLEAN
- 1 : pass bridged vlan-tagged ARP/IP traffic to arptables/iptables.
+ 1 : pass bridged vlan-tagged ARP/IP/IPv6 traffic to {arp,ip,ip6}tables.
+ 0 : disable this.
+ Default: 1
+
+bridge-nf-filter-pppoe-tagged - BOOLEAN
+ 1 : pass bridged pppoe-tagged IP/IPv6 traffic to {ip,ip6}tables.
0 : disable this.
Default: 1
diff --git a/include/linux/if_pppox.h b/include/linux/if_pppox.h
index 29d6579ff1a..6f987be60fe 100644
--- a/include/linux/if_pppox.h
+++ b/include/linux/if_pppox.h
@@ -111,6 +111,9 @@ struct pppoe_hdr {
struct pppoe_tag tag[0];
} __attribute__ ((packed));
+/* Length of entire PPPoE + PPP header */
+#define PPPOE_SES_HLEN 8
+
#ifdef __KERNEL__
#include <linux/skbuff.h>
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index 55689f39f77..19060030bac 100644
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -7,6 +7,7 @@
#include <linux/netfilter.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
+#include <linux/if_pppox.h>
/* Bridge Hooks */
/* After promisc drops, checksum checks. */
@@ -58,8 +59,14 @@ static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
* enough room for the encapsulating header (if there is one). */
static inline int nf_bridge_pad(const struct sk_buff *skb)
{
- return (skb->nf_bridge && skb->protocol == htons(ETH_P_8021Q))
- ? VLAN_HLEN : 0;
+ 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;
}
struct bridge_skb_cb {
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index df2d9ed20a4..47f1c53332c 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -792,6 +792,7 @@ enum {
NET_BRIDGE_NF_CALL_IPTABLES = 2,
NET_BRIDGE_NF_CALL_IP6TABLES = 3,
NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4,
+ NET_BRIDGE_NF_FILTER_PPPOE_TAGGED = 5,
};
/* CTL_FS names: */
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index fd70d041e51..9b2986b182b 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -29,6 +29,8 @@
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
+#include <linux/if_pppox.h>
+#include <linux/ppp_defs.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
@@ -57,8 +59,10 @@ static int brnf_call_iptables __read_mostly = 1;
static int brnf_call_ip6tables __read_mostly = 1;
static int brnf_call_arptables __read_mostly = 1;
static int brnf_filter_vlan_tagged __read_mostly = 1;
+static int brnf_filter_pppoe_tagged __read_mostly = 1;
#else
#define brnf_filter_vlan_tagged 1
+#define brnf_filter_pppoe_tagged 1
#endif
static inline __be16 vlan_proto(const struct sk_buff *skb)
@@ -81,6 +85,22 @@ static inline __be16 vlan_proto(const struct sk_buff *skb)
vlan_proto(skb) == htons(ETH_P_ARP) && \
brnf_filter_vlan_tagged)
+static inline __be16 pppoe_proto(const struct sk_buff *skb)
+{
+ return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
+ sizeof(struct pppoe_hdr)));
+}
+
+#define IS_PPPOE_IP(skb) \
+ (skb->protocol == htons(ETH_P_PPP_SES) && \
+ pppoe_proto(skb) == htons(PPP_IP) && \
+ brnf_filter_pppoe_tagged)
+
+#define IS_PPPOE_IPV6(skb) \
+ (skb->protocol == htons(ETH_P_PPP_SES) && \
+ pppoe_proto(skb) == htons(PPP_IPV6) && \
+ brnf_filter_pppoe_tagged)
+
/* We need these fake structures to make netfilter happy --
* lots of places assume that skb->dst != NULL, which isn't
* all that unreasonable.
@@ -128,6 +148,8 @@ static inline void nf_bridge_save_header(struct sk_buff *skb)
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;
skb_copy_from_linear_data_offset(skb, -header_size,
skb->nf_bridge->data, header_size);
@@ -144,6 +166,8 @@ int nf_bridge_copy_header(struct sk_buff *skb)
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;
err = skb_cow(skb, header_size);
if (err)
@@ -154,6 +178,8 @@ int nf_bridge_copy_header(struct sk_buff *skb)
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);
return 0;
}
@@ -177,6 +203,9 @@ static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
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_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish, 1);
@@ -258,6 +287,9 @@ static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
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;
}
skb->dst->output(skb);
}
@@ -328,6 +360,10 @@ bridged_dnat:
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_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
skb, skb->dev, NULL,
@@ -347,6 +383,9 @@ bridged_dnat:
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_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish, 1);
@@ -489,7 +528,8 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
__u32 len;
struct sk_buff *skb = *pskb;
- if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb)) {
+ if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) ||
+ IS_PPPOE_IPV6(skb)) {
#ifdef CONFIG_SYSCTL
if (!brnf_call_ip6tables)
return NF_ACCEPT;
@@ -500,6 +540,9 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
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;
}
return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);
}
@@ -508,7 +551,8 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
return NF_ACCEPT;
#endif
- if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb))
+ if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) &&
+ !IS_PPPOE_IP(skb))
return NF_ACCEPT;
if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
@@ -517,6 +561,9 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
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;
}
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
@@ -598,6 +645,9 @@ static int br_nf_forward_finish(struct sk_buff *skb)
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_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,
skb->dev, br_forward_finish, 1);
@@ -626,7 +676,8 @@ static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
if (!parent)
return NF_DROP;
- if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
+ if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) ||
+ IS_PPPOE_IP(skb))
pf = PF_INET;
else
pf = PF_INET6;
@@ -634,6 +685,9 @@ static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
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 = skb->nf_bridge;
@@ -726,6 +780,9 @@ static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
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_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev,
@@ -771,7 +828,8 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
if (!realoutdev)
return NF_DROP;
- if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
+ if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) ||
+ IS_PPPOE_IP(skb))
pf = PF_INET;
else
pf = PF_INET6;
@@ -793,6 +851,9 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
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_save_header(skb);
@@ -930,6 +991,14 @@ static ctl_table brnf_table[] = {
.mode = 0644,
.proc_handler = &brnf_sysctl_call_tables,
},
+ {
+ .ctl_name = NET_BRIDGE_NF_FILTER_PPPOE_TAGGED,
+ .procname = "bridge-nf-filter-pppoe-tagged",
+ .data = &brnf_filter_pppoe_tagged,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &brnf_sysctl_call_tables,
+ },
{ .ctl_name = 0 }
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 05:16:27 +0000