X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fnetfilter.h;h=0c5eb7ed8b3f75d65674bb7364423be0745a2e47;hb=c010b2f76c3032e48097a6eef291d8593d5d79a6;hp=4777f1b619ce17a2834eb5f545e5cae1a1d5b2aa;hpb=5f79e0f916a3bdeccc910fdf466bca582a9b2cca;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index 4777f1b..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. */ @@ -29,7 +33,7 @@ #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__ @@ -39,19 +43,44 @@ #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__ #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 *)); @@ -88,24 +117,10 @@ 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); @@ -119,72 +134,13 @@ 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[]; +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]; -/* 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, 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, - 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(int pf, unsigned int hook, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *), int thresh); @@ -196,7 +152,7 @@ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb, * 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 sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *), int thresh, @@ -208,14 +164,14 @@ 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(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, 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 @@ -242,13 +198,13 @@ 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;}) @@ -266,64 +222,33 @@ int compat_nf_setsockopt(struct sock *sk, int pf, int optval, 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, - 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); - -/* 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 int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); -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 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_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[NPROTO]; +static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) { return rcu_dereference(nf_afinfo[family]); } @@ -332,7 +257,7 @@ 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; + const struct nf_afinfo *afinfo; __sum16 csum = 0; rcu_read_lock(); @@ -343,10 +268,25 @@ 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; + + rcu_read_lock(); + afinfo = nf_get_afinfo(family); + if (afinfo) + csum = afinfo->checksum_partial(skb, hook, dataoff, len, + protocol); + rcu_read_unlock(); + return csum; +} -#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info)) +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 *); @@ -354,11 +294,16 @@ 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) +#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 } @@ -371,15 +316,15 @@ extern struct proc_dir_entry *proc_net_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 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(int pf, unsigned int hook, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *)) { @@ -393,9 +338,61 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) {} #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*/