X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fnetfilter.h;h=25fc122603409b22fb3b202205ec11e3413ed842;hb=6e23ae2a48750bda407a4a58f52a4865d7308bf5;hp=189ba67ba6032d4e741adc50624ac2572f3b0730;hpb=5917ed961def82a4dba9198d11a75f79d115a8cb;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index 189ba67..25fc122 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -29,7 +29,7 @@ #define NF_VERDICT_QMASK 0xffff0000 #define NF_VERDICT_QBITS 16 -#define NF_QUEUE_NR(x) ((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK | NF_QUEUE) +#define NF_QUEUE_NR(x) (((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK) | NF_QUEUE) /* only for userspace compatibility */ #ifndef __KERNEL__ @@ -39,8 +39,16 @@ #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 +}; + #ifdef __KERNEL__ -#include #ifdef CONFIG_NETFILTER extern void netfilter_init(void); @@ -52,7 +60,7 @@ struct sk_buff; struct net_device; typedef unsigned int nf_hookfn(unsigned int hooknum, - struct sk_buff **skb, + struct sk_buff *skb, const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)); @@ -80,14 +88,17 @@ struct nf_sockopt_ops 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; - struct task_struct *cleanup_task; + /* Use the module struct to lock set/get code in place */ + struct module *owner; }; /* Each queued (to userspace) skbuff has one of these. */ @@ -106,12 +117,24 @@ struct nf_info /* 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]; /* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will @@ -157,8 +180,8 @@ struct nf_logger { /* Function to register/unregister log function. */ 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); +void nf_log_unregister(struct nf_logger *logger); +void nf_log_unregister_pf(int pf); /* Calls the registered backend logging function */ void nf_log_packet(int pf, @@ -168,6 +191,40 @@ void nf_log_packet(int pf, const struct net_device *out, struct nf_loginfo *li, const char *fmt, ...); + +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 @@ -188,35 +245,23 @@ void nf_log_packet(int pf, /* 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) \ -({int __ret; \ -if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \ - __ret = (okfn)(skb); \ -__ret;}) + +/* HX: It's slightly less gross now. */ + #define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \ ({int __ret; \ -if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \ - __ret = (okfn)(skb); \ -__ret;}) -#else -#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \ -({int __ret; \ -if (list_empty(&nf_hooks[pf][hook]) || \ - (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \ +if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\ __ret = (okfn)(skb); \ __ret;}) -#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \ + +#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \ ({int __ret; \ -if (list_empty(&nf_hooks[pf][hook]) || \ - (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \ +if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\ __ret = (okfn)(skb); \ __ret;}) -#endif -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); +#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, @@ -224,6 +269,11 @@ 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 */ struct nf_queue_handler { int (*outfn)(struct sk_buff *skb, struct nf_info *info, @@ -233,33 +283,93 @@ struct nf_queue_handler { }; extern int nf_register_queue_handler(int pf, struct nf_queue_handler *qh); -extern int nf_unregister_queue_handler(int pf); +extern int nf_unregister_queue_handler(int pf, + struct nf_queue_handler *qh); 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 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); +extern int skb_make_writable(struct sk_buff *skb, 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); +} -struct nf_queue_rerouter { - void (*save)(const struct sk_buff *skb, struct nf_info *info); - int (*reroute)(struct sk_buff **skb, const struct nf_info *info); - int rer_size; +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)) -extern int nf_register_queue_rerouter(int pf, struct nf_queue_rerouter *rer); -extern int nf_unregister_queue_rerouter(int pf); +#include +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 @@ -268,8 +378,34 @@ extern struct proc_dir_entry *proc_net_netfilter; #else /* !CONFIG_NETFILTER */ #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) -static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *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*/