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net/bridge/br_netfilter.c
28 KB
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/* * Handle firewalling * Linux ethernet bridge * * Authors: * Lennert Buytenhek <buytenh@gnu.org> * 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) * Sep 01 2004: add IPv6 filtering (bdschuym) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Lennert dedicates this file to Kerstin Wurdinger. */ #include <linux/module.h> #include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/ip.h> #include <linux/netdevice.h> #include <linux/skbuff.h> |
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#include <linux/if_arp.h> |
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#include <linux/if_ether.h> #include <linux/if_vlan.h> |
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#include <linux/if_pppox.h> #include <linux/ppp_defs.h> |
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#include <linux/netfilter_bridge.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter_ipv6.h> #include <linux/netfilter_arp.h> #include <linux/in_route.h> |
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#include <linux/inetdevice.h> |
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|
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#include <net/ip.h> #include <net/ipv6.h> |
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#include <net/route.h> |
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#include <asm/uaccess.h> |
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#include "br_private.h" #ifdef CONFIG_SYSCTL #include <linux/sysctl.h> #endif #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ (skb->nf_bridge->data))->daddr.ipv4) |
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#define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) |
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#ifdef CONFIG_SYSCTL static struct ctl_table_header *brnf_sysctl_header; |
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static int brnf_call_iptables __read_mostly = 1; static int brnf_call_ip6tables __read_mostly = 1; static int brnf_call_arptables __read_mostly = 1; |
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static int brnf_filter_vlan_tagged __read_mostly = 0; static int brnf_filter_pppoe_tagged __read_mostly = 0; |
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#else |
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#define brnf_filter_vlan_tagged 0 #define brnf_filter_pppoe_tagged 0 |
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#endif |
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static inline __be16 vlan_proto(const struct sk_buff *skb) |
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{ return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; } #define IS_VLAN_IP(skb) \ (skb->protocol == htons(ETH_P_8021Q) && \ |
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vlan_proto(skb) == htons(ETH_P_IP) && \ |
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brnf_filter_vlan_tagged) #define IS_VLAN_IPV6(skb) \ (skb->protocol == htons(ETH_P_8021Q) && \ vlan_proto(skb) == htons(ETH_P_IPV6) &&\ brnf_filter_vlan_tagged) #define IS_VLAN_ARP(skb) \ (skb->protocol == htons(ETH_P_8021Q) && \ vlan_proto(skb) == htons(ETH_P_ARP) && \ brnf_filter_vlan_tagged) |
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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) |
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static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) { } static struct dst_ops fake_dst_ops = { .family = AF_INET, |
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.protocol = cpu_to_be16(ETH_P_IP), |
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.update_pmtu = fake_update_pmtu, |
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.entries = ATOMIC_INIT(0), }; |
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/* * Initialize bogus route table used to keep netfilter happy. |
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* Currently, we fill in the PMTU entry because netfilter * refragmentation needs it, and the rt_flags entry because * ipt_REJECT needs it. Future netfilter modules might |
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* require us to fill additional fields. */ void br_netfilter_rtable_init(struct net_bridge *br) { struct rtable *rt = &br->fake_rtable; atomic_set(&rt->u.dst.__refcnt, 1); |
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rt->u.dst.dev = br->dev; |
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rt->u.dst.path = &rt->u.dst; rt->u.dst.metrics[RTAX_MTU - 1] = 1500; rt->u.dst.flags = DST_NOXFRM; |
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rt->u.dst.ops = &fake_dst_ops; |
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} static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) { struct net_bridge_port *port = rcu_dereference(dev->br_port); return port ? &port->br->fake_rtable : NULL; } |
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static inline struct net_device *bridge_parent(const struct net_device *dev) { struct net_bridge_port *port = rcu_dereference(dev->br_port); return port ? port->br->dev : NULL; } |
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static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) { skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); if (likely(skb->nf_bridge)) atomic_set(&(skb->nf_bridge->use), 1); return skb->nf_bridge; } |
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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; } |
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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) |
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{ |
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unsigned int len = nf_bridge_encap_header_len(skb); skb_pull(skb, len); skb->network_header += len; } |
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|
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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); |
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|
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skb_copy_from_linear_data_offset(skb, -header_size, skb->nf_bridge->data, header_size); |
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} |
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/* * When forwarding bridge frames, we save a copy of the original * header before processing. */ int nf_bridge_copy_header(struct sk_buff *skb) { int err; |
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int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
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|
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err = skb_cow_head(skb, header_size); |
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if (err) return err; |
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skb_copy_to_linear_data_offset(skb, -header_size, skb->nf_bridge->data, header_size); |
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__skb_push(skb, nf_bridge_encap_header_len(skb)); |
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return 0; } |
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/* PF_BRIDGE/PRE_ROUTING *********************************************/ /* Undo the changes made for ip6tables PREROUTING and continue the * bridge PRE_ROUTING hook. */ static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) { struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
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struct rtable *rt; |
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if (nf_bridge->mask & BRNF_PKT_TYPE) { skb->pkt_type = PACKET_OTHERHOST; nf_bridge->mask ^= BRNF_PKT_TYPE; } nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
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rt = bridge_parent_rtable(nf_bridge->physindev); if (!rt) { |
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kfree_skb(skb); return 0; } |
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dst_hold(&rt->u.dst); |
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skb_dst_set(skb, &rt->u.dst); |
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skb->dev = nf_bridge->physindev; |
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nf_bridge_push_encap_header(skb); |
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NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, br_handle_frame_finish, 1); return 0; } static void __br_dnat_complain(void) { static unsigned long last_complaint; if (jiffies - last_complaint >= 5 * HZ) { printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " |
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"forwarding to be enabled "); |
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last_complaint = jiffies; } } /* This requires some explaining. If DNAT has taken place, * we will need to fix up the destination Ethernet address, * and this is a tricky process. * * There are two cases to consider: * 1. The packet was DNAT'ed to a device in the same bridge * port group as it was received on. We can still bridge * the packet. * 2. The packet was DNAT'ed to a different device, either * a non-bridged device or another bridge port group. * The packet will need to be routed. * * The correct way of distinguishing between these two cases is to * call ip_route_input() and to look at skb->dst->dev, which is * changed to the destination device if ip_route_input() succeeds. * * Let us first consider the case that ip_route_input() succeeds: * * If skb->dst->dev equals the logical bridge device the packet |
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* 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() |
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* not much later. In that function it is assured that the iptables * FORWARD chain is traversed for the packet. * * Otherwise, the packet is considered to be routed and we just * change the destination MAC address so that the packet will |
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* later be passed up to the IP stack to be routed. For a redirected * packet, ip_route_input() will give back the localhost as output device, * which differs from the bridge device. |
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* * Let us now consider the case that ip_route_input() fails: * |
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* This can be because the destination address is martian, in which case * the packet will be dropped. |
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* After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() * will fail, while __ip_route_output_key() will return success. The source * address for __ip_route_output_key() is set to zero, so __ip_route_output_key * thinks we're handling a locally generated packet and won't care * if IP forwarding is allowed. We send a warning message to the users's * log telling her to put IP forwarding on. * * ip_route_input() will also fail if there is no route available. * In that case we just drop the packet. * * --Lennert, 20020411 * --Bart, 20020416 (updated) |
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* --Bart, 20021007 (updated) * --Bart, 20062711 (updated) */ |
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static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) { |
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if (skb->pkt_type == PACKET_OTHERHOST) { 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); |
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if (skb->dev) { |
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struct dst_entry *dst = skb_dst(skb); |
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|
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nf_bridge_pull_encap_header(skb); |
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if (dst->hh) return neigh_hh_output(dst->hh, skb); else if (dst->neighbour) return dst->neighbour->output(skb); |
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} |
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kfree_skb(skb); |
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return 0; } static int br_nf_pre_routing_finish(struct sk_buff *skb) { struct net_device *dev = skb->dev; |
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struct iphdr *iph = ip_hdr(skb); |
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struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
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struct rtable *rt; |
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int err; |
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|
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if (nf_bridge->mask & BRNF_PKT_TYPE) { skb->pkt_type = PACKET_OTHERHOST; nf_bridge->mask ^= BRNF_PKT_TYPE; } nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
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if (dnat_took_place(skb)) { |
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if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
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struct flowi fl = { .nl_u = { .ip4_u = { .daddr = iph->daddr, .saddr = 0, .tos = RT_TOS(iph->tos) }, }, .proto = 0, }; |
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struct in_device *in_dev = __in_dev_get_rcu(dev); |
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/* If err equals -EHOSTUNREACH the error is due to a * martian destination or due to the fact that * forwarding is disabled. For most martian packets, * ip_route_output_key() will fail. It won't fail for 2 types of * martian destinations: loopback destinations and destination * 0.0.0.0. In both cases the packet will be dropped because the * destination is the loopback device and not the bridge. */ if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) goto free_skb; |
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|
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if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
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/* - Bridged-and-DNAT'ed traffic doesn't |
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* require ip_forwarding. */ if (((struct dst_entry *)rt)->dev == dev) { |
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skb_dst_set(skb, (struct dst_entry *)rt); |
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goto bridged_dnat; } |
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/* we are sure that forwarding is disabled, so printing * this message is no problem. Note that the packet could * still have a martian destination address, in which case * the packet could be dropped even if forwarding were enabled */ |
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__br_dnat_complain(); dst_release((struct dst_entry *)rt); } |
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free_skb: |
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kfree_skb(skb); return 0; } else { |
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if (skb_dst(skb)->dev == dev) { |
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bridged_dnat: /* Tell br_nf_local_out this is a * bridged frame */ nf_bridge->mask |= BRNF_BRIDGED_DNAT; skb->dev = nf_bridge->physindev; |
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nf_bridge_push_encap_header(skb); |
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NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, br_nf_pre_routing_finish_bridge, 1); return 0; } |
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memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
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skb->pkt_type = PACKET_HOST; } } else { |
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rt = bridge_parent_rtable(nf_bridge->physindev); if (!rt) { |
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kfree_skb(skb); return 0; } |
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dst_hold(&rt->u.dst); |
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skb_dst_set(skb, &rt->u.dst); |
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} skb->dev = nf_bridge->physindev; |
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nf_bridge_push_encap_header(skb); |
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NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, br_handle_frame_finish, 1); return 0; } /* Some common code for IPv4/IPv6 */ |
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static struct net_device *setup_pre_routing(struct sk_buff *skb) |
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{ struct nf_bridge_info *nf_bridge = skb->nf_bridge; if (skb->pkt_type == PACKET_OTHERHOST) { skb->pkt_type = PACKET_HOST; nf_bridge->mask |= BRNF_PKT_TYPE; } nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; nf_bridge->physindev = skb->dev; skb->dev = bridge_parent(skb->dev); |
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return skb->dev; |
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} /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ static int check_hbh_len(struct sk_buff *skb) { |
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unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
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u32 pkt_len; |
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const unsigned char *nh = skb_network_header(skb); int off = raw - nh; |
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int len = (raw[1] + 1) << 3; |
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if ((raw + len) - skb->data > skb_headlen(skb)) goto bad; off += 2; len -= 2; while (len > 0) { |
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int optlen = nh[off + 1] + 2; |
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|
d56f90a7c [SK_BUFF]: Introd... |
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switch (nh[off]) { |
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case IPV6_TLV_PAD0: optlen = 1; break; case IPV6_TLV_PADN: break; case IPV6_TLV_JUMBO: |
d56f90a7c [SK_BUFF]: Introd... |
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if (nh[off + 1] != 4 || (off & 3) != 2) |
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goto bad; |
d56f90a7c [SK_BUFF]: Introd... |
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pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b03664869 [BRIDGE-NF]: Fix ... |
465 |
if (pkt_len <= IPV6_MAXPLEN || |
0660e03f6 [SK_BUFF]: Introd... |
466 |
ipv6_hdr(skb)->payload_len) |
b03664869 [BRIDGE-NF]: Fix ... |
467 |
goto bad; |
1da177e4c Linux-2.6.12-rc2 |
468 469 |
if (pkt_len > skb->len - sizeof(struct ipv6hdr)) goto bad; |
b03664869 [BRIDGE-NF]: Fix ... |
470 |
if (pskb_trim_rcsum(skb, |
789bc3e5b [BRIDGE]: netfilt... |
471 |
pkt_len + sizeof(struct ipv6hdr))) |
b03664869 [BRIDGE-NF]: Fix ... |
472 |
goto bad; |
d56f90a7c [SK_BUFF]: Introd... |
473 |
nh = skb_network_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 |
break; default: if (optlen > len) goto bad; break; } off += optlen; len -= optlen; } if (len == 0) return 0; bad: return -1; } /* Replicate the checks that IPv6 does on packet reception and pass the packet * to ip6tables, which doesn't support NAT, so things are fairly simple. */ static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, |
789bc3e5b [BRIDGE]: netfilt... |
493 494 495 496 |
struct sk_buff *skb, const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
497 498 499 |
{ struct ipv6hdr *hdr; u32 pkt_len; |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 504 505 |
if (skb->len < sizeof(struct ipv6hdr)) goto inhdr_error; if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto inhdr_error; |
0660e03f6 [SK_BUFF]: Introd... |
506 |
hdr = ipv6_hdr(skb); |
1da177e4c Linux-2.6.12-rc2 |
507 508 509 510 511 512 513 514 515 |
if (hdr->version != 6) goto inhdr_error; pkt_len = ntohs(hdr->payload_len); if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { if (pkt_len + sizeof(struct ipv6hdr) > skb->len) goto inhdr_error; |
b38dfee3d [NET]: skb_trim a... |
516 517 |
if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) goto inhdr_error; |
1da177e4c Linux-2.6.12-rc2 |
518 519 |
} if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
789bc3e5b [BRIDGE]: netfilt... |
520 |
goto inhdr_error; |
1da177e4c Linux-2.6.12-rc2 |
521 |
|
789bc3e5b [BRIDGE]: netfilt... |
522 |
nf_bridge_put(skb->nf_bridge); |
fdeabdefb [BRIDGE]: netfilt... |
523 |
if (!nf_bridge_alloc(skb)) |
1da177e4c Linux-2.6.12-rc2 |
524 |
return NF_DROP; |
5dce971ac [BRIDGE]: netfilt... |
525 526 |
if (!setup_pre_routing(skb)) return NF_DROP; |
1da177e4c Linux-2.6.12-rc2 |
527 |
|
6e23ae2a4 [NETFILTER]: Intr... |
528 |
NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4c Linux-2.6.12-rc2 |
529 530 531 532 533 534 535 536 537 538 539 540 541 542 |
br_nf_pre_routing_finish_ipv6); return NF_STOLEN; inhdr_error: return NF_DROP; } /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. * Replicate the checks that IPv4 does on packet reception. * Set skb->dev to the bridge device (i.e. parent of the * receiving device) to make netfilter happy, the REDIRECT * target in particular. Save the original destination IP * address to be able to detect DNAT afterwards. */ |
3db05fea5 [NETFILTER]: Repl... |
543 |
static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a61 [BRIDGE] netfilte... |
544 545 546 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
547 548 |
{ struct iphdr *iph; |
e7c243c92 [VLAN/BRIDGE]: Fi... |
549 |
__u32 len = nf_bridge_encap_header_len(skb); |
e7c243c92 [VLAN/BRIDGE]: Fi... |
550 551 |
if (unlikely(!pskb_may_pull(skb, len))) goto out; |
1da177e4c Linux-2.6.12-rc2 |
552 |
|
516299d2f [NETFILTER]: brid... |
553 554 |
if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 |
#ifdef CONFIG_SYSCTL if (!brnf_call_ip6tables) return NF_ACCEPT; #endif |
fc38582db [NETFILTER]: brid... |
559 |
nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 564 565 |
return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); } #ifdef CONFIG_SYSCTL if (!brnf_call_iptables) return NF_ACCEPT; #endif |
516299d2f [NETFILTER]: brid... |
566 567 |
if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4c Linux-2.6.12-rc2 |
568 |
return NF_ACCEPT; |
fc38582db [NETFILTER]: brid... |
569 |
nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4c Linux-2.6.12-rc2 |
570 571 572 |
if (!pskb_may_pull(skb, sizeof(struct iphdr))) goto inhdr_error; |
eddc9ec53 [SK_BUFF]: Introd... |
573 |
iph = ip_hdr(skb); |
1da177e4c Linux-2.6.12-rc2 |
574 575 |
if (iph->ihl < 5 || iph->version != 4) goto inhdr_error; |
789bc3e5b [BRIDGE]: netfilt... |
576 |
if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4c Linux-2.6.12-rc2 |
577 |
goto inhdr_error; |
eddc9ec53 [SK_BUFF]: Introd... |
578 |
iph = ip_hdr(skb); |
789bc3e5b [BRIDGE]: netfilt... |
579 |
if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4c Linux-2.6.12-rc2 |
580 581 582 |
goto inhdr_error; len = ntohs(iph->tot_len); |
789bc3e5b [BRIDGE]: netfilt... |
583 |
if (skb->len < len || len < 4 * iph->ihl) |
1da177e4c Linux-2.6.12-rc2 |
584 |
goto inhdr_error; |
b38dfee3d [NET]: skb_trim a... |
585 |
pskb_trim_rcsum(skb, len); |
1da177e4c Linux-2.6.12-rc2 |
586 |
|
789bc3e5b [BRIDGE]: netfilt... |
587 |
nf_bridge_put(skb->nf_bridge); |
fdeabdefb [BRIDGE]: netfilt... |
588 |
if (!nf_bridge_alloc(skb)) |
1da177e4c Linux-2.6.12-rc2 |
589 |
return NF_DROP; |
5dce971ac [BRIDGE]: netfilt... |
590 591 |
if (!setup_pre_routing(skb)) return NF_DROP; |
1da177e4c Linux-2.6.12-rc2 |
592 |
store_orig_dstaddr(skb); |
6e23ae2a4 [NETFILTER]: Intr... |
593 |
NF_HOOK(PF_INET, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4c Linux-2.6.12-rc2 |
594 595 596 597 598 |
br_nf_pre_routing_finish); return NF_STOLEN; inhdr_error: |
789bc3e5b [BRIDGE]: netfilt... |
599 |
// IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4c Linux-2.6.12-rc2 |
600 601 602 603 604 605 606 607 608 609 610 611 |
out: return NF_DROP; } /* PF_BRIDGE/LOCAL_IN ************************************************/ /* The packet is locally destined, which requires a real * dst_entry, so detach the fake one. On the way up, the * packet would pass through PRE_ROUTING again (which already * took place when the packet entered the bridge), but we * register an IPv4 PRE_ROUTING 'sabotage' hook that will * prevent this from happening. */ |
3db05fea5 [NETFILTER]: Repl... |
612 |
static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5b [BRIDGE]: netfilt... |
613 614 615 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
616 |
{ |
511c3f92a net: skb->rtable ... |
617 |
struct rtable *rt = skb_rtable(skb); |
adf30907d net: skb->dst acc... |
618 619 |
if (rt && rt == bridge_parent_rtable(in)) skb_dst_drop(skb); |
1da177e4c Linux-2.6.12-rc2 |
620 621 622 |
return NF_ACCEPT; } |
1da177e4c Linux-2.6.12-rc2 |
623 624 625 626 627 |
/* PF_BRIDGE/FORWARD *************************************************/ static int br_nf_forward_finish(struct sk_buff *skb) { struct nf_bridge_info *nf_bridge = skb->nf_bridge; struct net_device *in; |
1da177e4c Linux-2.6.12-rc2 |
628 |
|
8b42ec392 [BRIDGE]: netfilt... |
629 |
if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4c Linux-2.6.12-rc2 |
630 631 632 633 634 635 636 637 |
in = nf_bridge->physindev; if (nf_bridge->mask & BRNF_PKT_TYPE) { skb->pkt_type = PACKET_OTHERHOST; nf_bridge->mask ^= BRNF_PKT_TYPE; } } else { in = *((struct net_device **)(skb->cb)); } |
fc38582db [NETFILTER]: brid... |
638 |
nf_bridge_push_encap_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
639 |
NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5b [BRIDGE]: netfilt... |
640 |
skb->dev, br_forward_finish, 1); |
1da177e4c Linux-2.6.12-rc2 |
641 642 643 644 645 646 647 648 |
return 0; } /* This is the 'purely bridged' case. For IP, we pass the packet to * netfilter with indev and outdev set to the bridge device, * 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. */ |
3db05fea5 [NETFILTER]: Repl... |
649 |
static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5b [BRIDGE]: netfilt... |
650 651 652 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
653 |
{ |
1da177e4c Linux-2.6.12-rc2 |
654 |
struct nf_bridge_info *nf_bridge; |
5dce971ac [BRIDGE]: netfilt... |
655 |
struct net_device *parent; |
76108cea0 netfilter: Use un... |
656 |
u_int8_t pf; |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 |
if (!skb->nf_bridge) return NF_ACCEPT; |
2dc2f207f [NETFILTER]: brid... |
660 661 662 663 |
/* Need exclusive nf_bridge_info since we might have multiple * different physoutdevs. */ if (!nf_bridge_unshare(skb)) return NF_DROP; |
5dce971ac [BRIDGE]: netfilt... |
664 665 666 |
parent = bridge_parent(out); if (!parent) return NF_DROP; |
516299d2f [NETFILTER]: brid... |
667 668 |
if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
1da177e4c Linux-2.6.12-rc2 |
669 |
pf = PF_INET; |
a2bd40ad3 netfilter 02/09: ... |
670 671 |
else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
1da177e4c Linux-2.6.12-rc2 |
672 |
pf = PF_INET6; |
a2bd40ad3 netfilter 02/09: ... |
673 674 |
else return NF_ACCEPT; |
1da177e4c Linux-2.6.12-rc2 |
675 |
|
3db05fea5 [NETFILTER]: Repl... |
676 |
nf_bridge_pull_encap_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
677 |
|
1da177e4c Linux-2.6.12-rc2 |
678 679 680 681 682 683 684 685 686 |
nf_bridge = skb->nf_bridge; if (skb->pkt_type == PACKET_OTHERHOST) { skb->pkt_type = PACKET_HOST; nf_bridge->mask |= BRNF_PKT_TYPE; } /* The physdev module checks on this */ nf_bridge->mask |= BRNF_BRIDGED; nf_bridge->physoutdev = skb->dev; |
6e23ae2a4 [NETFILTER]: Intr... |
687 |
NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971ac [BRIDGE]: netfilt... |
688 |
br_nf_forward_finish); |
1da177e4c Linux-2.6.12-rc2 |
689 690 691 |
return NF_STOLEN; } |
3db05fea5 [NETFILTER]: Repl... |
692 |
static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5b [BRIDGE]: netfilt... |
693 694 695 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
696 |
{ |
1da177e4c Linux-2.6.12-rc2 |
697 698 699 700 701 702 |
struct net_device **d = (struct net_device **)(skb->cb); #ifdef CONFIG_SYSCTL if (!brnf_call_arptables) return NF_ACCEPT; #endif |
f8a260286 [BRIDGE]: netfilt... |
703 |
if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec392 [BRIDGE]: netfilt... |
704 |
if (!IS_VLAN_ARP(skb)) |
1da177e4c Linux-2.6.12-rc2 |
705 |
return NF_ACCEPT; |
3db05fea5 [NETFILTER]: Repl... |
706 |
nf_bridge_pull_encap_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
707 |
} |
d0a92be05 [SK_BUFF]: Introd... |
708 |
if (arp_hdr(skb)->ar_pln != 4) { |
fc38582db [NETFILTER]: brid... |
709 |
if (IS_VLAN_ARP(skb)) |
3db05fea5 [NETFILTER]: Repl... |
710 |
nf_bridge_push_encap_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 |
return NF_ACCEPT; } *d = (struct net_device *)in; |
fdc9314cb netfilter: replac... |
714 |
NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4c Linux-2.6.12-rc2 |
715 716 717 718 |
(struct net_device *)out, br_nf_forward_finish); return NF_STOLEN; } |
2bf540b73 [NETFILTER]: brid... |
719 720 721 |
/* PF_BRIDGE/LOCAL_OUT *********************************************** * * This function sees both locally originated IP packets and forwarded |
1da177e4c Linux-2.6.12-rc2 |
722 723 |
* IP packets (in both cases the destination device is a bridge * device). It also sees bridged-and-DNAT'ed packets. |
1da177e4c Linux-2.6.12-rc2 |
724 725 726 727 728 729 |
* * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor * will be executed. |
2bf540b73 [NETFILTER]: brid... |
730 |
*/ |
3db05fea5 [NETFILTER]: Repl... |
731 |
static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb, |
789bc3e5b [BRIDGE]: netfilt... |
732 733 734 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
735 |
{ |
2bf540b73 [NETFILTER]: brid... |
736 |
struct net_device *realindev; |
1da177e4c Linux-2.6.12-rc2 |
737 |
struct nf_bridge_info *nf_bridge; |
1da177e4c Linux-2.6.12-rc2 |
738 739 740 |
if (!skb->nf_bridge) return NF_ACCEPT; |
2dc2f207f [NETFILTER]: brid... |
741 742 743 744 |
/* Need exclusive nf_bridge_info since we might have multiple * different physoutdevs. */ if (!nf_bridge_unshare(skb)) return NF_DROP; |
1da177e4c Linux-2.6.12-rc2 |
745 |
nf_bridge = skb->nf_bridge; |
2bf540b73 [NETFILTER]: brid... |
746 747 |
if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) return NF_ACCEPT; |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 |
/* Bridged, take PF_BRIDGE/FORWARD. * (see big note in front of br_nf_pre_routing_finish) */ |
2bf540b73 [NETFILTER]: brid... |
751 752 |
nf_bridge->physoutdev = skb->dev; realindev = nf_bridge->physindev; |
1da177e4c Linux-2.6.12-rc2 |
753 |
|
2bf540b73 [NETFILTER]: brid... |
754 755 756 |
if (nf_bridge->mask & BRNF_PKT_TYPE) { skb->pkt_type = PACKET_OTHERHOST; nf_bridge->mask ^= BRNF_PKT_TYPE; |
1da177e4c Linux-2.6.12-rc2 |
757 |
} |
fc38582db [NETFILTER]: brid... |
758 |
nf_bridge_push_encap_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
759 |
|
2bf540b73 [NETFILTER]: brid... |
760 761 |
NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, br_forward_finish); |
1da177e4c Linux-2.6.12-rc2 |
762 763 |
return NF_STOLEN; } |
c197facc8 netfilter: bridge... |
764 |
#if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aefa [NETFILTER]: Fix ... |
765 766 |
static int br_nf_dev_queue_xmit(struct sk_buff *skb) { |
c197facc8 netfilter: bridge... |
767 768 |
if (skb->nfct != NULL && (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb)) && |
2e2f7aefa [NETFILTER]: Fix ... |
769 |
skb->len > skb->dev->mtu && |
89114afd4 [NET] gso: Add sk... |
770 |
!skb_is_gso(skb)) |
2e2f7aefa [NETFILTER]: Fix ... |
771 772 773 774 |
return ip_fragment(skb, br_dev_queue_push_xmit); else return br_dev_queue_push_xmit(skb); } |
c197facc8 netfilter: bridge... |
775 776 777 778 779 780 |
#else static int br_nf_dev_queue_xmit(struct sk_buff *skb) { return br_dev_queue_push_xmit(skb); } #endif |
1da177e4c Linux-2.6.12-rc2 |
781 782 |
/* PF_BRIDGE/POST_ROUTING ********************************************/ |
3db05fea5 [NETFILTER]: Repl... |
783 |
static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5b [BRIDGE]: netfilt... |
784 785 786 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
787 |
{ |
3db05fea5 [NETFILTER]: Repl... |
788 |
struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4c Linux-2.6.12-rc2 |
789 |
struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea0 netfilter: Use un... |
790 |
u_int8_t pf; |
1da177e4c Linux-2.6.12-rc2 |
791 792 793 794 |
#ifdef CONFIG_NETFILTER_DEBUG /* Be very paranoid. This probably won't happen anymore, but let's * keep the check just to be sure... */ |
98e399f82 [SK_BUFF]: Introd... |
795 796 |
if (skb_mac_header(skb) < skb->head || skb_mac_header(skb) + ETH_HLEN > skb->data) { |
1da177e4c Linux-2.6.12-rc2 |
797 |
printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2f [NETFILTER] bridg... |
798 799 |
"bad mac.raw pointer. "); |
1da177e4c Linux-2.6.12-rc2 |
800 801 802 803 804 805 |
goto print_error; } #endif if (!nf_bridge) return NF_ACCEPT; |
81d9ddae8 [NETFILTER]: brid... |
806 807 |
if (!(nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))) return NF_ACCEPT; |
5dce971ac [BRIDGE]: netfilt... |
808 809 |
if (!realoutdev) return NF_DROP; |
516299d2f [NETFILTER]: brid... |
810 811 |
if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
1da177e4c Linux-2.6.12-rc2 |
812 |
pf = PF_INET; |
a2bd40ad3 netfilter 02/09: ... |
813 814 |
else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
1da177e4c Linux-2.6.12-rc2 |
815 |
pf = PF_INET6; |
a2bd40ad3 netfilter 02/09: ... |
816 817 |
else return NF_ACCEPT; |
1da177e4c Linux-2.6.12-rc2 |
818 819 |
#ifdef CONFIG_NETFILTER_DEBUG |
adf30907d net: skb->dst acc... |
820 |
if (skb_dst(skb) == NULL) { |
8394e9b2f [NETFILTER] bridg... |
821 822 |
printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL "); |
1da177e4c Linux-2.6.12-rc2 |
823 824 |
goto print_error; } |
1da177e4c Linux-2.6.12-rc2 |
825 826 827 828 829 830 831 832 |
#endif /* We assume any code from br_dev_queue_push_xmit onwards doesn't care * about the value of skb->pkt_type. */ if (skb->pkt_type == PACKET_OTHERHOST) { skb->pkt_type = PACKET_HOST; nf_bridge->mask |= BRNF_PKT_TYPE; } |
fc38582db [NETFILTER]: brid... |
833 |
nf_bridge_pull_encap_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
834 |
nf_bridge_save_header(skb); |
6e23ae2a4 [NETFILTER]: Intr... |
835 |
NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aefa [NETFILTER]: Fix ... |
836 |
br_nf_dev_queue_xmit); |
1da177e4c Linux-2.6.12-rc2 |
837 838 839 840 841 842 843 |
return NF_STOLEN; #ifdef CONFIG_NETFILTER_DEBUG print_error: if (skb->dev != NULL) { printk("[%s]", skb->dev->name); |
178a3259f [BRIDGE]: Better ... |
844 845 |
if (realoutdev) printk("[%s]", realoutdev->name); |
1da177e4c Linux-2.6.12-rc2 |
846 |
} |
98e399f82 [SK_BUFF]: Introd... |
847 848 |
printk(" head:%p, raw:%p, data:%p ", skb->head, skb_mac_header(skb), |
789bc3e5b [BRIDGE]: netfilt... |
849 |
skb->data); |
8394e9b2f [NETFILTER] bridg... |
850 |
dump_stack(); |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 |
return NF_ACCEPT; #endif } |
1da177e4c Linux-2.6.12-rc2 |
854 855 856 |
/* IP/SABOTAGE *****************************************************/ /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING * for the second time. */ |
3db05fea5 [NETFILTER]: Repl... |
857 |
static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5b [BRIDGE]: netfilt... |
858 859 860 |
const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
861 |
{ |
3db05fea5 [NETFILTER]: Repl... |
862 863 |
if (skb->nf_bridge && !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
1da177e4c Linux-2.6.12-rc2 |
864 865 866 867 868 |
return NF_STOP; } return NF_ACCEPT; } |
1da177e4c Linux-2.6.12-rc2 |
869 870 871 872 |
/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent * 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. */ |
1999414a4 [NETFILTER]: Mark... |
873 |
static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd894 net, bridge: alig... |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 |
{ .hook = br_nf_pre_routing, .owner = THIS_MODULE, .pf = PF_BRIDGE, .hooknum = NF_BR_PRE_ROUTING, .priority = NF_BR_PRI_BRNF, }, { .hook = br_nf_local_in, .owner = THIS_MODULE, .pf = PF_BRIDGE, .hooknum = NF_BR_LOCAL_IN, .priority = NF_BR_PRI_BRNF, }, { .hook = br_nf_forward_ip, .owner = THIS_MODULE, .pf = PF_BRIDGE, .hooknum = NF_BR_FORWARD, .priority = NF_BR_PRI_BRNF - 1, }, { .hook = br_nf_forward_arp, .owner = THIS_MODULE, .pf = PF_BRIDGE, .hooknum = NF_BR_FORWARD, .priority = NF_BR_PRI_BRNF, }, { .hook = br_nf_local_out, .owner = THIS_MODULE, .pf = PF_BRIDGE, .hooknum = NF_BR_LOCAL_OUT, .priority = NF_BR_PRI_FIRST, }, { .hook = br_nf_post_routing, .owner = THIS_MODULE, .pf = PF_BRIDGE, .hooknum = NF_BR_POST_ROUTING, .priority = NF_BR_PRI_LAST, }, { .hook = ip_sabotage_in, .owner = THIS_MODULE, .pf = PF_INET, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_FIRST, }, { .hook = ip_sabotage_in, .owner = THIS_MODULE, .pf = PF_INET6, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP6_PRI_FIRST, }, |
1da177e4c Linux-2.6.12-rc2 |
930 931 932 933 |
}; #ifdef CONFIG_SYSCTL static |
8d65af789 sysctl: remove "s... |
934 |
int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5b [BRIDGE]: netfilt... |
935 |
void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4c Linux-2.6.12-rc2 |
936 937 |
{ int ret; |
8d65af789 sysctl: remove "s... |
938 |
ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4c Linux-2.6.12-rc2 |
939 940 941 942 943 944 945 946 |
if (write && *(int *)(ctl->data)) *(int *)(ctl->data) = 1; return ret; } static ctl_table brnf_table[] = { { |
1da177e4c Linux-2.6.12-rc2 |
947 948 949 950 |
.procname = "bridge-nf-call-arptables", .data = &brnf_call_arptables, .maxlen = sizeof(int), .mode = 0644, |
6d9f239a1 net: '&' redux |
951 |
.proc_handler = brnf_sysctl_call_tables, |
1da177e4c Linux-2.6.12-rc2 |
952 953 |
}, { |
1da177e4c Linux-2.6.12-rc2 |
954 955 956 957 |
.procname = "bridge-nf-call-iptables", .data = &brnf_call_iptables, .maxlen = sizeof(int), .mode = 0644, |
6d9f239a1 net: '&' redux |
958 |
.proc_handler = brnf_sysctl_call_tables, |
1da177e4c Linux-2.6.12-rc2 |
959 960 |
}, { |
1da177e4c Linux-2.6.12-rc2 |
961 962 963 964 |
.procname = "bridge-nf-call-ip6tables", .data = &brnf_call_ip6tables, .maxlen = sizeof(int), .mode = 0644, |
6d9f239a1 net: '&' redux |
965 |
.proc_handler = brnf_sysctl_call_tables, |
1da177e4c Linux-2.6.12-rc2 |
966 967 |
}, { |
1da177e4c Linux-2.6.12-rc2 |
968 969 970 971 |
.procname = "bridge-nf-filter-vlan-tagged", .data = &brnf_filter_vlan_tagged, .maxlen = sizeof(int), .mode = 0644, |
6d9f239a1 net: '&' redux |
972 |
.proc_handler = brnf_sysctl_call_tables, |
516299d2f [NETFILTER]: brid... |
973 974 |
}, { |
516299d2f [NETFILTER]: brid... |
975 976 977 978 |
.procname = "bridge-nf-filter-pppoe-tagged", .data = &brnf_filter_pppoe_tagged, .maxlen = sizeof(int), .mode = 0644, |
6d9f239a1 net: '&' redux |
979 |
.proc_handler = brnf_sysctl_call_tables, |
1da177e4c Linux-2.6.12-rc2 |
980 |
}, |
f8572d8f2 sysctl net: Remov... |
981 |
{ } |
1da177e4c Linux-2.6.12-rc2 |
982 |
}; |
b5ccd792f [NET]: Simple ctl... |
983 |
static struct ctl_path brnf_path[] = { |
f8572d8f2 sysctl net: Remov... |
984 985 |
{ .procname = "net", }, { .procname = "bridge", }, |
b5ccd792f [NET]: Simple ctl... |
986 |
{ } |
1da177e4c Linux-2.6.12-rc2 |
987 988 |
}; #endif |
5eb87f456 [NETFILTER]: brid... |
989 |
int __init br_netfilter_init(void) |
1da177e4c Linux-2.6.12-rc2 |
990 |
{ |
5eb87f456 [NETFILTER]: brid... |
991 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
992 |
|
5eb87f456 [NETFILTER]: brid... |
993 994 |
ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); if (ret < 0) |
1da177e4c Linux-2.6.12-rc2 |
995 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
996 |
#ifdef CONFIG_SYSCTL |
b5ccd792f [NET]: Simple ctl... |
997 |
brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4c Linux-2.6.12-rc2 |
998 |
if (brnf_sysctl_header == NULL) { |
789bc3e5b [BRIDGE]: netfilt... |
999 1000 1001 |
printk(KERN_WARNING "br_netfilter: can't register to sysctl. "); |
5eb87f456 [NETFILTER]: brid... |
1002 1003 |
nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1004 1005 |
} #endif |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 |
printk(KERN_NOTICE "Bridge firewalling registered "); |
1da177e4c Linux-2.6.12-rc2 |
1008 1009 1010 1011 1012 |
return 0; } void br_netfilter_fini(void) { |
5eb87f456 [NETFILTER]: brid... |
1013 |
nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4c Linux-2.6.12-rc2 |
1014 1015 1016 1017 |
#ifdef CONFIG_SYSCTL unregister_sysctl_table(brnf_sysctl_header); #endif } |