X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fnetfilter.h;h=48c54960773c1ebbe32463dfb1c32166da9cf84d;hb=f653398c86a1c104f0992bd788dd4bb065449be4;hp=b31a9bca9361307a6ce997c029634a58e2cd4939;hpb=422c346fad806e2abaeffac686860ebc98dfe33e;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index b31a9bc..48c5496 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -3,13 +3,15 @@ #ifdef __KERNEL__ #include -#include #include #include #include +#include +#include #include #include #endif +#include #include /* Responses from hook functions. */ @@ -29,7 +31,7 @@ #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_BITS) & NF_VERDICT_QMASK) | NF_QUEUE) /* only for userspace compatibility */ #ifndef __KERNEL__ @@ -39,42 +41,74 @@ #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 +}; + +enum { + NFPROTO_UNSPEC = 0, + NFPROTO_IPV4 = 2, + NFPROTO_ARP = 3, + NFPROTO_BRIDGE = 7, + NFPROTO_IPV6 = 10, + NFPROTO_DECNET = 12, + NFPROTO_NUMPROTO, +}; + +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 *)); -struct nf_hook_ops -{ +struct nf_hook_ops { struct list_head list; /* User fills in from here down. */ nf_hookfn *hook; struct module *owner; - int pf; - int hooknum; + u_int8_t pf; + unsigned int hooknum; /* Hooks are ordered in ascending priority. */ int priority; }; -struct nf_sockopt_ops -{ +struct nf_sockopt_ops { struct list_head list; - int pf; + u_int8_t pf; /* Non-inclusive ranges: use 0/0/NULL to never get called. */ int set_optmin; @@ -89,24 +123,10 @@ struct nf_sockopt_ops 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); @@ -118,64 +138,15 @@ void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); int nf_register_sockopt(struct nf_sockopt_ops *reg); void nf_unregister_sockopt(struct nf_sockopt_ops *reg); -extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS]; - -/* 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; -}; +#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 */ -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; -}; +extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; -/* 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); - -/* 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, - struct nf_loginfo *li, - const char *fmt, ...); - -int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb, +int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *), int thresh); @@ -186,8 +157,8 @@ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb, * 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, +static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, + struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *), int thresh, @@ -199,14 +170,14 @@ static inline int nf_hook_thresh(int pf, unsigned int hook, if (list_empty(&nf_hooks[pf][hook])) return 1; #endif - return nf_hook_slow(pf, hook, pskb, indev, outdev, okfn, thresh); + return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); } -static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb, +static inline int nf_hook(u_int8_t 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, pskb, indev, outdev, okfn, INT_MIN, 1); + return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1); } /* Activate hook; either okfn or kfree_skb called, unless a hook @@ -233,13 +204,13 @@ static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb, #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)\ +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)\ +if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\ __ret = (okfn)(skb); \ __ret;}) @@ -247,65 +218,53 @@ __ret;}) 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 nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, + unsigned int len); +int nf_getsockopt(struct sock *sk, u_int8_t 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, +int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, + char __user *opt, unsigned int len); +int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, int *len); -/* Packet queuing */ -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, - 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 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); + +struct flowi; +struct nf_queue_entry; struct nf_afinfo { unsigned short family; - unsigned int (*checksum)(struct sk_buff *skb, unsigned int hook, + __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_info *info); - int (*reroute)(struct sk_buff **skb, - const struct nf_info *info); + struct nf_queue_entry *entry); + int (*reroute)(struct sk_buff *skb, + const struct nf_queue_entry *entry); int route_key_size; }; -extern struct nf_afinfo *nf_afinfo[]; -static inline struct nf_afinfo *nf_get_afinfo(unsigned short family) +extern const struct nf_afinfo *nf_afinfo[NFPROTO_NUMPROTO]; +static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) { return rcu_dereference(nf_afinfo[family]); } -static inline unsigned int +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; - unsigned int csum = 0; + const struct nf_afinfo *afinfo; + __sum16 csum = 0; rcu_read_lock(); afinfo = nf_get_afinfo(family); @@ -315,22 +274,42 @@ nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, return csum; } -extern int nf_register_afinfo(struct nf_afinfo *afinfo); -extern void nf_unregister_afinfo(struct nf_afinfo *afinfo); +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; -#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info)) + 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) +nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) { -#ifdef CONFIG_IP_NF_NAT_NEEDED +#ifdef CONFIG_NF_NAT_NEEDED void (*decodefn)(struct sk_buff *, struct flowi *); - if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL) - decodefn(skb, fl); + if (family == AF_INET) { + rcu_read_lock(); + decodefn = rcu_dereference(ip_nat_decode_session); + if (decodefn) + decodefn(skb, fl); + rcu_read_unlock(); + } #endif } @@ -342,26 +321,35 @@ extern struct proc_dir_entry *proc_net_netfilter; #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, +static inline int nf_hook_thresh(u_int8_t 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(*pskb); + return okfn(skb); } -static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb, +static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, 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) {} +nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t 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*/