X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fnetfilter.h;h=0c5eb7ed8b3f75d65674bb7364423be0745a2e47;hb=c010b2f76c3032e48097a6eef291d8593d5d79a6;hp=2e2045482cb134d6bf8f9631e2c32a391052d6a1;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index 2e20454..0c5eb7e 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -3,13 +3,17 @@ #ifdef __KERNEL__ #include -#include #include #include +#include #include +#include +#include #include #include +#include #endif +#include #include /* Responses from hook functions. */ @@ -21,25 +25,62 @@ #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_BITS) & 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 { + __u32 all[4]; + __be32 ip; + __be32 ip6[4]; + struct in_addr in; + struct in6_addr in6; +}; #ifdef __KERNEL__ -#include #ifdef CONFIG_NETFILTER +static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, + const union nf_inet_addr *a2) +{ + return a1->all[0] == a2->all[0] && + a1->all[1] == a2->all[1] && + a1->all[2] == a2->all[2] && + a1->all[3] == a2->all[3]; +} + 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, + struct sk_buff *skb, const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)); @@ -67,57 +108,71 @@ 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. */ -struct nf_info -{ - /* The ops struct which sent us to userspace. */ - struct nf_hook_ops *elem; - - /* If we're sent to userspace, this keeps housekeeping info */ - int pf; - unsigned int hook; - struct net_device *indev, *outdev; - int (*okfn)(struct sk_buff *); -}; - /* 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]; -typedef void nf_logfn(unsigned int hooknum, - const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const char *prefix); - -/* Function to register/unregister log function. */ -int nf_log_register(int pf, nf_logfn *logfn); -void nf_log_unregister(int pf, nf_logfn *logfn); - -/* Calls the registered backend logging function */ -void nf_log_packet(int pf, - unsigned int hooknum, - const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - 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 @@ -138,35 +193,23 @@ 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) \ +if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 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) \ - __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, @@ -174,26 +217,182 @@ 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); -/* Packet queuing */ -typedef int (*nf_queue_outfn_t)(struct sk_buff *skb, - struct nf_info *info, void *data); -extern int nf_register_queue_handler(int pf, - nf_queue_outfn_t outfn, void *data); -extern int nf_unregister_queue_handler(int pf); -extern void nf_reinject(struct sk_buff *skb, - struct nf_info *info, - unsigned int verdict); +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); + __sum16 (*checksum_partial)(struct sk_buff *skb, + unsigned int hook, + unsigned int dataoff, + unsigned int len, + 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 void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *); -extern void nf_ct_attach(struct sk_buff *, struct sk_buff *); +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; +} + +static inline __sum16 +nf_checksum_partial(struct sk_buff *skb, unsigned int hook, + unsigned int dataoff, unsigned int len, + 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_partial(skb, hook, dataoff, len, + 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 +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 +} -/* FIXME: Before cache is ever used, this must be implemented for real. */ -extern void nf_invalidate_cache(int pf); +#ifdef CONFIG_PROC_FS +#include +extern struct proc_dir_entry *proc_net_netfilter; +#endif #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 + +static inline struct net *nf_pre_routing_net(const struct net_device *in, + const struct net_device *out) +{ +#ifdef CONFIG_NET_NS + return in->nd_net; +#else + return &init_net; +#endif +} + +static inline struct net *nf_local_in_net(const struct net_device *in, + const struct net_device *out) +{ +#ifdef CONFIG_NET_NS + return in->nd_net; +#else + return &init_net; +#endif +} + +static inline struct net *nf_forward_net(const struct net_device *in, + const struct net_device *out) +{ +#ifdef CONFIG_NET_NS + BUG_ON(in->nd_net != out->nd_net); + return in->nd_net; +#else + return &init_net; +#endif +} + +static inline struct net *nf_local_out_net(const struct net_device *in, + const struct net_device *out) +{ +#ifdef CONFIG_NET_NS + return out->nd_net; +#else + return &init_net; +#endif +} + +static inline struct net *nf_post_routing_net(const struct net_device *in, + const struct net_device *out) +{ +#ifdef CONFIG_NET_NS + return out->nd_net; +#else + return &init_net; +#endif +} + #endif /*__KERNEL__*/ #endif /*__LINUX_NETFILTER_H*/