net/netfilter/br_netfilter.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _BR_NETFILTER_H_
0003 #define _BR_NETFILTER_H_
0004
0005 #include <linux/netfilter.h>
0006
0007 #include "../../../net/bridge/br_private.h"
0008
0009 static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
0010 {
0011 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
0012     struct nf_bridge_info *b = skb_ext_add(skb, SKB_EXT_BRIDGE_NF);
0013
0014     if (b)
0015         memset(b, 0, sizeof(*b));
0016
0017     return b;
0018 #else
0019     return NULL;
0020 #endif
0021 }
0022
0023 void nf_bridge_update_protocol(struct sk_buff *skb);
0024
0025 int br_nf_hook_thresh(unsigned int hook, struct net *net, struct sock *sk,
0026               struct sk_buff *skb, struct net_device *indev,
0027               struct net_device *outdev,
0028               int (*okfn)(struct net *, struct sock *,
0029                   struct sk_buff *));
0030
0031 unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb);
0032
0033 static inline void nf_bridge_push_encap_header(struct sk_buff *skb)
0034 {
0035     unsigned int len = nf_bridge_encap_header_len(skb);
0036
0037     skb_push(skb, len);
0038     skb->network_header -= len;
0039 }
0040
0041 int br_nf_pre_routing_finish_bridge(struct net *net, struct sock *sk, struct sk_buff *skb);
0042
0043 static inline struct rtable *bridge_parent_rtable(const struct net_device *dev)
0044 {
0045 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
0046     struct net_bridge_port *port;
0047
0048     port = br_port_get_rcu(dev);
0049     return port ? &port->br->fake_rtable : NULL;
0050 #else
0051     return NULL;
0052 #endif
0053 }
0054
0055 struct net_device *setup_pre_routing(struct sk_buff *skb,
0056                      const struct net *net);
0057
0058 #if IS_ENABLED(CONFIG_IPV6)
0059 int br_validate_ipv6(struct net *net, struct sk_buff *skb);
0060 unsigned int br_nf_pre_routing_ipv6(void *priv,
0061                     struct sk_buff *skb,
0062                     const struct nf_hook_state *state);
0063 #else
0064 static inline int br_validate_ipv6(struct net *net, struct sk_buff *skb)
0065 {
0066     return -1;
0067 }
0068
0069 static inline unsigned int
0070 br_nf_pre_routing_ipv6(void *priv, struct sk_buff *skb,
0071                const struct nf_hook_state *state)
0072 {
0073     return NF_ACCEPT;
0074 }
0075 #endif
0076
0077 #endif /* _BR_NETFILTER_H_ */