Import netfilter.h from kernel to get hold of union nf_inet_addr
and fix a compile error in current iptable tarball releases when
used with non-development kernels.
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
---
include/linux/netfilter.h | 315 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 315 insertions(+)
Index: iptables-modules/include/linux/netfilter.h
===================================================================
--- /dev/null
+++ iptables-modules/include/linux/netfilter.h
@@ -0,0 +1,315 @@
+#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/if.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#endif
+#include <linux/compiler.h>
+
+/* Responses from hook functions. */
+#define NF_DROP 0
+#define NF_ACCEPT 1
+#define NF_STOLEN 2
+#define NF_QUEUE 3
+#define NF_REPEAT 4
+#define NF_STOP 5
+#define NF_MAX_VERDICT NF_STOP
+
+/* we overload the higher bits for encoding auxiliary data such as the queue
+ * number. Not nice, but better than additional function arguments. */
+#define NF_VERDICT_MASK 0x0000ffff
+#define NF_VERDICT_BITS 16
+
+#define NF_VERDICT_QMASK 0xffff0000
+#define NF_VERDICT_QBITS 16
+
+#define NF_QUEUE_NR(x) (((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK) | NF_QUEUE)
+
+/* only for userspace compatibility */
+#ifndef __KERNEL__
+/* Generic cache responses from hook functions.
+ <= 0x2000 is used for protocol-flags. */
+#define NFC_UNKNOWN 0x4000
+#define NFC_ALTERED 0x8000
+#endif
+
+enum nf_inet_hooks {
+ NF_INET_PRE_ROUTING,
+ NF_INET_LOCAL_IN,
+ NF_INET_FORWARD,
+ NF_INET_LOCAL_OUT,
+ NF_INET_POST_ROUTING,
+ NF_INET_NUMHOOKS
+};
+
+union nf_inet_addr {
+ u_int32_t all[4];
+ __be32 ip;
+ __be32 ip6[4];
+ struct in_addr in;
+ struct in6_addr in6;
+};
+
+#ifdef __KERNEL__
+#ifdef CONFIG_NETFILTER
+
+extern void netfilter_init(void);
+
+/* Largest hook number + 1 */
+#define NF_MAX_HOOKS 8
+
+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,
+ int (*okfn)(struct sk_buff *));
+
+struct nf_hook_ops
+{
+ struct list_head list;
+
+ /* User fills in from here down. */
+ nf_hookfn *hook;
+ struct module *owner;
+ int pf;
+ int hooknum;
+ /* Hooks are ordered in ascending priority. */
+ int priority;
+};
+
+struct nf_sockopt_ops
+{
+ struct list_head list;
+
+ int pf;
+
+ /* Non-inclusive ranges: use 0/0/NULL to never get called. */
+ int set_optmin;
+ int set_optmax;
+ int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
+ int (*compat_set)(struct sock *sk, int optval,
+ void __user *user, unsigned int len);
+
+ int get_optmin;
+ int get_optmax;
+ int (*get)(struct sock *sk, int optval, void __user *user, int *len);
+ int (*compat_get)(struct sock *sk, int optval,
+ void __user *user, int *len);
+
+ /* Use the module struct to lock set/get code in place */
+ struct module *owner;
+};
+
+/* Function to register/unregister hook points. */
+int nf_register_hook(struct nf_hook_ops *reg);
+void nf_unregister_hook(struct nf_hook_ops *reg);
+int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
+void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
+
+/* Functions to register get/setsockopt ranges (non-inclusive). You
+ need to check permissions yourself! */
+int nf_register_sockopt(struct nf_sockopt_ops *reg);
+void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
+
+#ifdef CONFIG_SYSCTL
+/* Sysctl registration */
+extern struct ctl_path nf_net_netfilter_sysctl_path[];
+extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
+#endif /* CONFIG_SYSCTL */
+
+extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
+
+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 *), int thresh);
+
+/**
+ * nf_hook_thresh - call a netfilter hook
+ *
+ * Returns 1 if the hook has allowed the packet to pass. The function
+ * okfn must be invoked by the caller in this case. Any other return
+ * value indicates the packet has been consumed by the hook.
+ */
+static inline int nf_hook_thresh(int pf, unsigned int hook,
+ struct sk_buff *skb,
+ struct net_device *indev,
+ struct net_device *outdev,
+ int (*okfn)(struct sk_buff *), int thresh,
+ int cond)
+{
+ if (!cond)
+ return 1;
+#ifndef CONFIG_NETFILTER_DEBUG
+ if (list_empty(&nf_hooks[pf][hook]))
+ return 1;
+#endif
+ return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
+}
+
+static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
+ struct net_device *indev, struct net_device *outdev,
+ int (*okfn)(struct sk_buff *))
+{
+ return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1);
+}
+
+/* Activate hook; 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 */
+
+/* HX: It's slightly less gross now. */
+
+#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
+({int __ret; \
+if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\
+ __ret = (okfn)(skb); \
+__ret;})
+
+#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
+({int __ret; \
+if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
+ __ret = (okfn)(skb); \
+__ret;})
+
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
+ NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
+
+/* Call setsockopt() */
+int nf_setsockopt(struct sock *sk, int pf, int optval, char __user *opt,
+ int len);
+int nf_getsockopt(struct sock *sk, int pf, int optval, char __user *opt,
+ int *len);
+
+int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
+ char __user *opt, int len);
+int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
+ char __user *opt, int *len);
+
+/* Call this before modifying an existing packet: ensures it is
+ modifiable and linear to the point you care about (writable_len).
+ Returns true or false. */
+extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
+
+struct flowi;
+struct nf_queue_entry;
+
+struct nf_afinfo {
+ unsigned short family;
+ __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
+ unsigned int dataoff, u_int8_t protocol);
+ int (*route)(struct dst_entry **dst, struct flowi *fl);
+ void (*saveroute)(const struct sk_buff *skb,
+ struct nf_queue_entry *entry);
+ int (*reroute)(struct sk_buff *skb,
+ const struct nf_queue_entry *entry);
+ int route_key_size;
+};
+
+extern const struct nf_afinfo *nf_afinfo[NPROTO];
+static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
+{
+ return rcu_dereference(nf_afinfo[family]);
+}
+
+static inline __sum16
+nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
+ u_int8_t protocol, unsigned short family)
+{
+ const struct nf_afinfo *afinfo;
+ __sum16 csum = 0;
+
+ rcu_read_lock();
+ afinfo = nf_get_afinfo(family);
+ if (afinfo)
+ csum = afinfo->checksum(skb, hook, dataoff, protocol);
+ rcu_read_unlock();
+ return csum;
+}
+
+extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
+extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
+
+#include <net/flow.h>
+extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
+
+static inline void
+nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family)
+{
+#ifdef CONFIG_NF_NAT_NEEDED
+ void (*decodefn)(struct sk_buff *, struct flowi *);
+
+ if (family == AF_INET) {
+ rcu_read_lock();
+ decodefn = rcu_dereference(ip_nat_decode_session);
+ if (decodefn)
+ decodefn(skb, fl);
+ rcu_read_unlock();
+ }
+#endif
+}
+
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+extern struct proc_dir_entry *proc_net_netfilter;
+#endif
+
+#else /* !CONFIG_NETFILTER */
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
+#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
+static inline int nf_hook_thresh(int pf, unsigned int hook,
+ struct sk_buff *skb,
+ struct net_device *indev,
+ struct net_device *outdev,
+ int (*okfn)(struct sk_buff *), int thresh,
+ int cond)
+{
+ return okfn(skb);
+}
+static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb,
+ struct net_device *indev, struct net_device *outdev,
+ int (*okfn)(struct sk_buff *))
+{
+ return 1;
+}
+struct flowi;
+static inline void
+nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) {}
+#endif /*CONFIG_NETFILTER*/
+
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *);
+extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
+extern void (*nf_ct_destroy)(struct nf_conntrack *);
+#else
+static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
+#endif
+
+#endif /*__KERNEL__*/
+#endif /*__LINUX_NETFILTER_H*/
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