#include <linux/wait.h>
#include <linux/list.h>
#endif
+#include <linux/compiler.h>
/* Responses from hook functions. */
#define NF_DROP 0
#define NF_STOLEN 2
#define NF_QUEUE 3
#define NF_REPEAT 4
-#define NF_MAX_VERDICT NF_REPEAT
+#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
#ifdef __KERNEL__
-#include <linux/config.h>
#ifdef CONFIG_NETFILTER
extern void netfilter_init(void);
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);
/* Number of users inside set() or get(). */
unsigned int use;
/* 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 */
+struct ctl_table_header *nf_register_sysctl_table(struct ctl_table *path,
+ struct ctl_table *table);
+void nf_unregister_sysctl_table(struct ctl_table_header *header,
+ struct ctl_table *table);
+extern struct ctl_table nf_net_netfilter_sysctl_path[];
+extern struct ctl_table nf_net_ipv4_netfilter_sysctl_path[];
+#endif /* CONFIG_SYSCTL */
+
extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
-typedef void nf_logfn(unsigned int hooknum,
+/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
+ * disappear once iptables is replaced with pkttables. Please DO NOT use them
+ * for any new code! */
+#define NF_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
+#define NF_LOG_TCPOPT 0x02 /* Log TCP options */
+#define NF_LOG_IPOPT 0x04 /* Log IP options */
+#define NF_LOG_UID 0x08 /* Log UID owning local socket */
+#define NF_LOG_MASK 0x0f
+
+#define NF_LOG_TYPE_LOG 0x01
+#define NF_LOG_TYPE_ULOG 0x02
+
+struct nf_loginfo {
+ u_int8_t type;
+ union {
+ struct {
+ u_int32_t copy_len;
+ u_int16_t group;
+ u_int16_t qthreshold;
+ } ulog;
+ struct {
+ u_int8_t level;
+ u_int8_t logflags;
+ } log;
+ } u;
+};
+
+typedef void nf_logfn(unsigned int pf,
+ unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
+ const struct nf_loginfo *li,
const char *prefix);
+struct nf_logger {
+ struct module *me;
+ nf_logfn *logfn;
+ char *name;
+};
+
/* Function to register/unregister log function. */
-int nf_log_register(int pf, nf_logfn *logfn);
-void nf_log_unregister(int pf, nf_logfn *logfn);
+int nf_log_register(int pf, struct nf_logger *logger);
+int nf_log_unregister_pf(int pf);
+void nf_log_unregister_logger(struct nf_logger *logger);
/* Calls the registered backend logging function */
void nf_log_packet(int pf,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
+ struct nf_loginfo *li,
const char *fmt, ...);
+
+int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
+ 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 **pskb,
+ 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, pskb, indev, outdev, okfn, thresh);
+}
+
+static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
+ struct net_device *indev, struct net_device *outdev,
+ int (*okfn)(struct sk_buff *))
+{
+ return nf_hook_thresh(pf, hook, pskb, 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
/* 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(pf, hook, skb, indev, outdev, okfn) \
- nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN)
-#define NF_HOOK_THRESH 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), INT_MIN))
-#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
-(list_empty(&nf_hooks[(pf)][(hook)]) \
- ? (okfn)(skb) \
- : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), (thresh)))
-#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 *), int thresh);
+/* 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 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);
+
/* Packet queuing */
-typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
- struct nf_info *info, void *data);
+struct nf_queue_handler {
+ int (*outfn)(struct sk_buff *skb, struct nf_info *info,
+ unsigned int queuenum, void *data);
+ void *data;
+ char *name;
+};
extern int nf_register_queue_handler(int pf,
- nf_queue_outfn_t outfn, void *data);
+ struct nf_queue_handler *qh);
extern int nf_unregister_queue_handler(int pf);
+extern void nf_unregister_queue_handlers(struct nf_queue_handler *qh);
extern void nf_reinject(struct sk_buff *skb,
struct nf_info *info,
unsigned int verdict);
-extern inline struct ipt_target *
-ipt_find_target_lock(const char *name, int *error, struct semaphore *mutex);
-extern inline struct ip6t_target *
-ip6t_find_target_lock(const char *name, int *error, struct semaphore *mutex);
-extern inline struct arpt_target *
-arpt_find_target_lock(const char *name, int *error, struct semaphore *mutex);
-extern void (*ip_ct_attach)(struct sk_buff *, struct nf_ct_info *);
-
-#ifdef CONFIG_NETFILTER_DEBUG
-extern void nf_dump_skb(int pf, struct sk_buff *skb);
-#endif
+extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *);
+extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
/* FIXME: Before cache is ever used, this must be implemented for real. */
extern void nf_invalidate_cache(int pf);
+/* 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 **pskb, unsigned int writable_len);
+
+static inline void nf_csum_replace4(__sum16 *sum, __be32 from, __be32 to)
+{
+ __be32 diff[] = { ~from, to };
+
+ *sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
+}
+
+static inline void nf_csum_replace2(__sum16 *sum, __be16 from, __be16 to)
+{
+ nf_csum_replace4(sum, (__force __be32)from, (__force __be32)to);
+}
+
+extern void nf_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+ __be32 from, __be32 to, int pseudohdr);
+
+static inline void nf_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
+ __be16 from, __be16 to, int pseudohdr)
+{
+ nf_proto_csum_replace4(sum, skb, (__force __be32)from,
+ (__force __be32)to, pseudohdr);
+}
+
+struct nf_afinfo {
+ unsigned short family;
+ __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
+ unsigned int dataoff, u_int8_t protocol);
+ void (*saveroute)(const struct sk_buff *skb,
+ struct nf_info *info);
+ int (*reroute)(struct sk_buff **skb,
+ const struct nf_info *info);
+ int route_key_size;
+};
+
+extern struct nf_afinfo *nf_afinfo[];
+static inline 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)
+{
+ 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(struct nf_afinfo *afinfo);
+extern void nf_unregister_afinfo(struct nf_afinfo *afinfo);
+
+#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
+
+#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)
+{
+#if defined(CONFIG_IP_NF_NAT_NEEDED) || defined(CONFIG_NF_NAT_NEEDED)
+ void (*decodefn)(struct sk_buff *, struct flowi *);
+
+ if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL)
+ decodefn(skb, fl);
+#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 **pskb,
+ struct net_device *indev,
+ struct net_device *outdev,
+ int (*okfn)(struct sk_buff *), int thresh,
+ int cond)
+{
+ return okfn(*pskb);
+}
+static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
+ struct net_device *indev, struct net_device *outdev,
+ int (*okfn)(struct sk_buff *))
+{
+ return 1;
+}
+static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
+struct flowi;
+static inline void
+nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) {}
#endif /*CONFIG_NETFILTER*/
#endif /*__KERNEL__*/
git://git.onelab.eu / linux-2.6.git / blobdiff