* ipt_REJECT needs it. Future netfilter modules might
* require us to fill additional fields. */
static struct net_device __fake_net_device = {
- .hard_header_len = ETH_HLEN
+ .hard_header_len = ETH_HLEN,
+#ifdef CONFIG_NET_NS
+ .nd_net = &init_net,
+#endif
};
static struct rtable __fake_rtable = {
return skb->nf_bridge;
}
-static inline void nf_bridge_save_header(struct sk_buff *skb)
+static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb)
+{
+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+
+ if (atomic_read(&nf_bridge->use) > 1) {
+ struct nf_bridge_info *tmp = nf_bridge_alloc(skb);
+
+ if (tmp) {
+ memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info));
+ atomic_set(&tmp->use, 1);
+ nf_bridge_put(nf_bridge);
+ }
+ nf_bridge = tmp;
+ }
+ return nf_bridge;
+}
+
+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)
+{
+ unsigned int len = nf_bridge_encap_header_len(skb);
+
+ skb_pull(skb, len);
+ skb->network_header += len;
+}
+
+static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb)
{
- int header_size = ETH_HLEN;
+ unsigned int len = nf_bridge_encap_header_len(skb);
+
+ skb_pull_rcsum(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_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);
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);
+ err = skb_cow_head(skb, header_size);
if (err)
return err;
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;
}
}
nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
- skb->dst = (struct dst_entry *)&__fake_rtable;
- dst_hold(skb->dst);
+ skb->rtable = &__fake_rtable;
+ dst_hold(&__fake_rtable.u.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);
* Let us first consider the case that ip_route_input() succeeds:
*
* If skb->dst->dev equals the logical bridge device the packet
- * came in on, we can consider this bridging. We then call
- * skb->dst->output() which will make the packet enter br_nf_local_out()
+ * came in on, we can consider this bridging. The packet is passed
+ * through the neighbour output function to build a new destination
+ * MAC address, which will make the packet enter br_nf_local_out()
* not much later. In that function it is assured that the iptables
* FORWARD chain is traversed for the packet.
*
skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
skb->dev = bridge_parent(skb->dev);
- 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;
- }
- skb->dst->output(skb);
+ if (skb->dev) {
+ struct dst_entry *dst = skb->dst;
+
+ nf_bridge_pull_encap_header(skb);
+
+ if (dst->hh)
+ return neigh_hh_output(dst->hh, skb);
+ else if (dst->neighbour)
+ return dst->neighbour->output(skb);
}
+ kfree_skb(skb);
return 0;
}
if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev))
goto free_skb;
- if (!ip_route_output_key(&rt, &fl)) {
+ if (!ip_route_output_key(&init_net, &rt, &fl)) {
/* - Bridged-and-DNAT'ed traffic doesn't
* require ip_forwarding. */
if (((struct dst_entry *)rt)->dev == dev) {
* 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,
skb->pkt_type = PACKET_HOST;
}
} else {
- skb->dst = (struct dst_entry *)&__fake_rtable;
- dst_hold(skb->dst);
+ skb->rtable = &__fake_rtable;
+ dst_hold(&__fake_rtable.u.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);
if (!setup_pre_routing(skb))
return NF_DROP;
- NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
+ NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
br_nf_pre_routing_finish_ipv6);
return NF_STOLEN;
* receiving device) to make netfilter happy, the REDIRECT
* target in particular. Save the original destination IP
* address to be able to detect DNAT afterwards. */
-static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
+static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct iphdr *iph;
- __u32 len;
- struct sk_buff *skb = *pskb;
+ __u32 len = nf_bridge_encap_header_len(skb);
+
+ if (unlikely(!pskb_may_pull(skb, len)))
+ goto out;
if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) ||
IS_PPPOE_IPV6(skb)) {
if (!brnf_call_ip6tables)
return NF_ACCEPT;
#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
!IS_PPPOE_IP(skb))
return NF_ACCEPT;
- 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;
return NF_DROP;
store_orig_dstaddr(skb);
- NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
+ NF_HOOK(PF_INET, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
br_nf_pre_routing_finish);
return NF_STOLEN;
* took place when the packet entered the bridge), but we
* register an IPv4 PRE_ROUTING 'sabotage' hook that will
* prevent this from happening. */
-static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
+static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- struct sk_buff *skb = *pskb;
-
- if (skb->dst == (struct dst_entry *)&__fake_rtable) {
- dst_release(skb->dst);
- skb->dst = NULL;
+ if (skb->rtable == &__fake_rtable) {
+ dst_release(&__fake_rtable.u.dst);
+ skb->rtable = NULL;
}
return NF_ACCEPT;
} 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;
* but we are still able to filter on the 'real' indev/outdev
* because of the physdev module. For ARP, indev and outdev are the
* bridge ports. */
-static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
+static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge;
struct net_device *parent;
int pf;
if (!skb->nf_bridge)
return NF_ACCEPT;
+ /* Need exclusive nf_bridge_info since we might have multiple
+ * different physoutdevs. */
+ if (!nf_bridge_unshare(skb))
+ return NF_DROP;
+
parent = bridge_parent(out);
if (!parent)
return NF_DROP;
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(skb);
nf_bridge = skb->nf_bridge;
if (skb->pkt_type == PACKET_OTHERHOST) {
nf_bridge->mask |= BRNF_BRIDGED;
nf_bridge->physoutdev = skb->dev;
- NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent,
+ NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent,
br_nf_forward_finish);
return NF_STOLEN;
}
-static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb,
+static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- struct sk_buff *skb = *pskb;
struct net_device **d = (struct net_device **)(skb->cb);
#ifdef CONFIG_SYSCTL
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(skb);
}
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(skb);
return NF_ACCEPT;
}
*d = (struct net_device *)in;
* NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
* will be executed.
*/
-static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
+static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct net_device *realindev;
- struct sk_buff *skb = *pskb;
struct nf_bridge_info *nf_bridge;
if (!skb->nf_bridge)
return NF_ACCEPT;
+ /* Need exclusive nf_bridge_info since we might have multiple
+ * different physoutdevs. */
+ if (!nf_bridge_unshare(skb))
+ return NF_DROP;
+
nf_bridge = skb->nf_bridge;
if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT))
return NF_ACCEPT;
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);
}
/* PF_BRIDGE/POST_ROUTING ********************************************/
-static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
+static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- struct sk_buff *skb = *pskb;
- struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
struct net_device *realoutdev = bridge_parent(skb->dev);
int pf;
if (!nf_bridge)
return NF_ACCEPT;
+ if (!(nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT)))
+ return NF_ACCEPT;
+
if (!realoutdev)
return NF_DROP;
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)
- if (nf_bridge->netoutdev)
- realoutdev = nf_bridge->netoutdev;
-#endif
- NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev,
+ NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev,
br_nf_dev_queue_xmit);
return NF_STOLEN;
/* IP/SABOTAGE *****************************************************/
/* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING
* for the second time. */
-static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb,
+static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- if ((*pskb)->nf_bridge &&
- !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
+ if (skb->nf_bridge &&
+ !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
return NF_STOP;
}
* PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
* ip_refrag() can return NF_STOLEN. */
-static struct nf_hook_ops br_nf_ops[] = {
+static struct nf_hook_ops br_nf_ops[] __read_mostly = {
{ .hook = br_nf_pre_routing,
.owner = THIS_MODULE,
.pf = PF_BRIDGE,
{ .hook = ip_sabotage_in,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
+ .hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_FIRST, },
{ .hook = ip_sabotage_in,
.owner = THIS_MODULE,
.pf = PF_INET6,
- .hooknum = NF_IP6_PRE_ROUTING,
+ .hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP6_PRI_FIRST, },
};
static ctl_table brnf_table[] = {
{
- .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES,
.procname = "bridge-nf-call-arptables",
.data = &brnf_call_arptables,
.maxlen = sizeof(int),
.proc_handler = &brnf_sysctl_call_tables,
},
{
- .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES,
.procname = "bridge-nf-call-iptables",
.data = &brnf_call_iptables,
.maxlen = sizeof(int),
.proc_handler = &brnf_sysctl_call_tables,
},
{
- .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES,
.procname = "bridge-nf-call-ip6tables",
.data = &brnf_call_ip6tables,
.maxlen = sizeof(int),
.proc_handler = &brnf_sysctl_call_tables,
},
{
- .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED,
.procname = "bridge-nf-filter-vlan-tagged",
.data = &brnf_filter_vlan_tagged,
.maxlen = sizeof(int),
.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),
{ .ctl_name = 0 }
};
-static ctl_table brnf_bridge_table[] = {
- {
- .ctl_name = NET_BRIDGE,
- .procname = "bridge",
- .mode = 0555,
- .child = brnf_table,
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table brnf_net_table[] = {
- {
- .ctl_name = CTL_NET,
- .procname = "net",
- .mode = 0555,
- .child = brnf_bridge_table,
- },
- { .ctl_name = 0 }
+static struct ctl_path brnf_path[] = {
+ { .procname = "net", .ctl_name = CTL_NET, },
+ { .procname = "bridge", .ctl_name = NET_BRIDGE, },
+ { }
};
#endif
if (ret < 0)
return ret;
#ifdef CONFIG_SYSCTL
- brnf_sysctl_header = register_sysctl_table(brnf_net_table);
+ brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table);
if (brnf_sysctl_header == NULL) {
printk(KERN_WARNING
"br_netfilter: can't register to sysctl.\n");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff