a0f4ecf349
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
#ifndef __LINUX_BRIDGE_NETFILTER_H
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#define __LINUX_BRIDGE_NETFILTER_H
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#include <uapi/linux/netfilter_bridge.h>
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enum nf_br_hook_priorities {
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NF_BR_PRI_FIRST = INT_MIN,
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NF_BR_PRI_NAT_DST_BRIDGED = -300,
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NF_BR_PRI_FILTER_BRIDGED = -200,
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NF_BR_PRI_BRNF = 0,
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NF_BR_PRI_NAT_DST_OTHER = 100,
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NF_BR_PRI_FILTER_OTHER = 200,
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NF_BR_PRI_NAT_SRC = 300,
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NF_BR_PRI_LAST = INT_MAX,
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};
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#ifdef CONFIG_BRIDGE_NETFILTER
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#define BRNF_PKT_TYPE 0x01
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#define BRNF_BRIDGED_DNAT 0x02
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#define BRNF_BRIDGED 0x04
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#define BRNF_NF_BRIDGE_PREROUTING 0x08
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#define BRNF_8021Q 0x10
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#define BRNF_PPPoE 0x20
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/* Only used in br_forward.c */
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int nf_bridge_copy_header(struct sk_buff *skb);
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static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
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{
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if (skb->nf_bridge &&
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skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
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return nf_bridge_copy_header(skb);
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return 0;
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}
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static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
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{
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switch (skb->protocol) {
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case __cpu_to_be16(ETH_P_8021Q):
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return VLAN_HLEN;
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case __cpu_to_be16(ETH_P_PPP_SES):
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return PPPOE_SES_HLEN;
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default:
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return 0;
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}
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}
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static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
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{
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if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
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return PPPOE_SES_HLEN;
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return 0;
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}
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int br_handle_frame_finish(struct sk_buff *skb);
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/* Only used in br_device.c */
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static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
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{
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struct nf_bridge_info *nf_bridge = skb->nf_bridge;
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skb_pull(skb, ETH_HLEN);
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nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
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skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
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skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
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skb->dev = nf_bridge->physindev;
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return br_handle_frame_finish(skb);
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}
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/* This is called by the IP fragmenting code and it ensures there is
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* enough room for the encapsulating header (if there is one). */
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static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
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{
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if (skb->nf_bridge)
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return nf_bridge_encap_header_len(skb);
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return 0;
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}
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struct bridge_skb_cb {
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union {
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__be32 ipv4;
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} daddr;
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};
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static inline void br_drop_fake_rtable(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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if (dst && (dst->flags & DST_FAKE_RTABLE))
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skb_dst_drop(skb);
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}
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#else
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#define nf_bridge_maybe_copy_header(skb) (0)
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#define nf_bridge_pad(skb) (0)
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#define br_drop_fake_rtable(skb) do { } while (0)
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#endif /* CONFIG_BRIDGE_NETFILTER */
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#endif
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