patch-2.3.15 linux/include/linux/netfilter.h

• Lines: 195
• Date: Tue Aug 24 17:12:39 1999
• Orig file: v2.3.14/linux/include/linux/netfilter.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.14/linux/include/linux/netfilter.h linux/include/linux/netfilter.h
@@ -0,0 +1,194 @@
+#ifndef __LINUX_NETFILTER_H
+#define __LINUX_NETFILTER_H
+
+#ifdef __KERNEL__
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/net.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#endif
+
+/* Responses from hook functions. */
+#define NF_DROP 0
+#define NF_ACCEPT 1
+#define NF_STOLEN 2
+#define NF_QUEUE 3
+#define NF_MAX_VERDICT NF_QUEUE
+
+/* Generic cache responses from hook functions. */
+#define NFC_ALTERED 0x8000
+#define NFC_UNKNOWN 0x4000
+
+#ifdef __KERNEL__
+#include <linux/config.h>
+#ifdef CONFIG_NETFILTER
+
+extern void netfilter_init(void);
+
+/* Largest hook number + 1 */
+#define NF_MAX_HOOKS 5
+
+struct sk_buff;
+struct net_device;
+
+typedef unsigned int nf_hookfn(unsigned int hooknum,
+			       struct sk_buff **skb,
+			       const struct net_device *in,
+			       const struct net_device *out);
+
+typedef unsigned int nf_cacheflushfn(const void *packet,
+				     const struct net_device *in,
+				     const struct net_device *out,
+				     u_int32_t packetcount,
+				     u_int32_t bytecount);
+
+struct nf_hook_ops
+{
+	struct list_head list;
+
+	/* User fills in from here down. */
+	nf_hookfn *hook;
+	nf_cacheflushfn *flush;
+	int pf;
+	int hooknum;
+	/* Hooks are ordered in ascending priority. */
+	int priority;
+};
+
+struct nf_setsockopt_ops
+{
+	struct list_head list;
+
+	int pf;
+	int optmin;
+	int optmax;
+	int (*fn)(int optval, void *user, unsigned int len);
+};
+
+/* Function to register/unregister hook points. */
+int nf_register_hook(struct nf_hook_ops *reg);
+void nf_unregister_hook(struct nf_hook_ops *reg);
+
+/* Functions to register setsockopt ranges (inclusive). */
+int nf_register_sockopt(struct nf_setsockopt_ops *reg);
+void nf_unregister_sockopt(struct nf_setsockopt_ops *reg);
+
+extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
+
+/* Activate hook/flush; either okfn or kfree_skb called, unless a hook
+   returns NF_STOLEN (in which case, it's up to the hook to deal with
+   the consequences).
+
+   Returns -ERRNO if packet dropped.  Zero means queued, stolen or
+   accepted.
+*/
+
+/* RR:
+   > I don't want nf_hook to return anything because people might forget
+   > about async and trust the return value to mean "packet was ok".
+
+   AK:
+   Just document it clearly, then you can expect some sense from kernel
+   coders :)
+*/
+
+/* This is gross, but inline doesn't cut it for avoiding the function
+   call in fast path: gcc doesn't inline (needs value tracking?). --RR */
+#ifdef CONFIG_NETFILTER_DEBUG
+#define NF_HOOK nf_hook_slow
+#else
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn)			\
+(list_empty(&nf_hooks[(pf)][(hook)])					\
+ ? (okfn)(skb)								\
+ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn)))
+#endif
+
+int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
+		 struct net_device *indev, struct net_device *outdev,
+		 int (*okfn)(struct sk_buff *));
+
+void nf_cacheflush(int pf, unsigned int hook, const void *packet,
+		   const struct net_device *indev, const struct net_device *outdev,
+		   __u32 packetcount, __u32 bytecount);
+
+/* Call setsockopt() */
+int nf_setsockopt(int pf, int optval, char *opt, unsigned int len);
+
+struct nf_wakeme
+{
+	wait_queue_head_t sleep;
+	struct sk_buff_head skbq;
+};
+
+/* For netfilter device. */
+struct nf_interest
+{
+	struct list_head list;
+
+	int pf;
+	/* Bitmask of hook numbers to match (1 << hooknum). */
+	unsigned int hookmask;
+	/* If non-zero, only catch packets with this mark. */
+	unsigned int mark;
+	/* If non-zero, only catch packets of this reason. */
+	unsigned int reason;
+
+	struct nf_wakeme *wake;
+};
+
+/* For asynchronous packet handling. */
+extern void nf_register_interest(struct nf_interest *interest);
+extern void nf_unregister_interest(struct nf_interest *interest);
+extern void nf_getinfo(const struct sk_buff *skb,
+		       struct net_device **indev,
+		       struct net_device **outdev,
+		       unsigned long *mark);
+extern void nf_reinject(struct sk_buff *skb,
+			unsigned long mark,
+			unsigned int verdict);
+
+#ifdef CONFIG_NETFILTER_DEBUG
+extern void nf_dump_skb(int pf, struct sk_buff *skb);
+#endif
+
+/* FIXME: Before cache is ever used, this must be implemented for real. */
+extern void nf_invalidate_cache(int pf);
+
+#else /* !CONFIG_NETFILTER */
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
+#endif /*CONFIG_NETFILTER*/
+
+/* From arch/i386/kernel/smp.c:
+ *
+ *	Why isn't this somewhere standard ??
+ *
+ * Maybe because this procedure is horribly buggy, and does
+ * not deserve to live.  Think about signedness issues for five
+ * seconds to see why.		- Linus
+ */
+
+/* Two signed, return a signed. */
+#define SMAX(a,b) ((ssize_t)(a)>(ssize_t)(b) ? (ssize_t)(a) : (ssize_t)(b))
+#define SMIN(a,b) ((ssize_t)(a)<(ssize_t)(b) ? (ssize_t)(a) : (ssize_t)(b))
+
+/* Two unsigned, return an unsigned. */
+#define UMAX(a,b) ((size_t)(a)>(size_t)(b) ? (size_t)(a) : (size_t)(b))
+#define UMIN(a,b) ((size_t)(a)<(size_t)(b) ? (size_t)(a) : (size_t)(b))
+
+/* Two unsigned, return a signed. */
+#define SUMAX(a,b) ((size_t)(a)>(size_t)(b) ? (ssize_t)(a) : (ssize_t)(b))
+#define SUMIN(a,b) ((size_t)(a)<(size_t)(b) ? (ssize_t)(a) : (ssize_t)(b))
+#endif /*__KERNEL__*/
+
+enum nf_reason {
+	/* Do not, NOT, reorder these.  Add at end. */
+	NF_REASON_NONE,
+	NF_REASON_SET_BY_IPCHAINS,
+	NF_REASON_FOR_ROUTING,
+	NF_REASON_FOR_CLS_FW,
+	NF_REASON_MIN_RESERVED_FOR_CONNTRACK = 1024,
+};
+
+#endif /*__LINUX_NETFILTER_H*/