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include/linux/netfilter.h
11.7 KB
b24413180 License cleanup: ... |
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/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_NETFILTER_H #define __LINUX_NETFILTER_H |
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#include <linux/init.h> |
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#include <linux/skbuff.h> #include <linux/net.h> #include <linux/if.h> |
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#include <linux/in.h> #include <linux/in6.h> |
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#include <linux/wait.h> #include <linux/list.h> |
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#include <linux/static_key.h> |
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#include <linux/netfilter_defs.h> |
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#include <linux/netdevice.h> #include <net/net_namespace.h> |
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#ifdef CONFIG_NETFILTER |
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static inline int NF_DROP_GETERR(int verdict) { return -(verdict >> NF_VERDICT_QBITS); } |
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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]; } |
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static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, union nf_inet_addr *result, const union nf_inet_addr *mask) { result->all[0] = a1->all[0] & mask->all[0]; result->all[1] = a1->all[1] & mask->all[1]; result->all[2] = a1->all[2] & mask->all[2]; result->all[3] = a1->all[3] & mask->all[3]; } |
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int netfilter_init(void); |
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struct sk_buff; |
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struct nf_hook_ops; |
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struct sock; |
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struct nf_hook_state { unsigned int hook; |
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u_int8_t pf; struct net_device *in; struct net_device *out; |
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struct sock *sk; |
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struct net *net; |
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int (*okfn)(struct net *, struct sock *, struct sk_buff *); |
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}; |
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typedef unsigned int nf_hookfn(void *priv, struct sk_buff *skb, const struct nf_hook_state *state); struct nf_hook_ops { |
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/* User fills in from here down. */ nf_hookfn *hook; struct net_device *dev; void *priv; u_int8_t pf; unsigned int hooknum; /* Hooks are ordered in ascending priority. */ int priority; }; struct nf_hook_entry { |
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nf_hookfn *hook; void *priv; |
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}; |
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struct nf_hook_entries { u16 num_hook_entries; /* padding */ struct nf_hook_entry hooks[]; /* trailer: pointers to original orig_ops of each hook. * * This is not part of struct nf_hook_entry since its only * needed in slow path (hook register/unregister). * * const struct nf_hook_ops *orig_ops[] */ }; |
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static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e) |
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{ |
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unsigned int n = e->num_hook_entries; const void *hook_end; hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */ return (struct nf_hook_ops **)hook_end; |
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} static inline int nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, struct nf_hook_state *state) { |
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return entry->hook(entry->priv, skb, state); |
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} |
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static inline void nf_hook_state_init(struct nf_hook_state *p, unsigned int hook, |
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u_int8_t pf, |
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struct net_device *indev, struct net_device *outdev, |
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struct sock *sk, |
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struct net *net, |
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int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
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{ p->hook = hook; |
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p->pf = pf; p->in = indev; p->out = outdev; |
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p->sk = sk; |
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p->net = net; |
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p->okfn = okfn; } |
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struct nf_sockopt_ops { |
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struct list_head list; |
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u_int8_t pf; |
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/* Non-inclusive ranges: use 0/0/NULL to never get called. */ int set_optmin; int set_optmax; int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); |
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#ifdef CONFIG_COMPAT |
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int (*compat_set)(struct sock *sk, int optval, void __user *user, unsigned int len); |
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#endif |
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int get_optmin; int get_optmax; int (*get)(struct sock *sk, int optval, void __user *user, int *len); |
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#ifdef CONFIG_COMPAT |
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int (*compat_get)(struct sock *sk, int optval, void __user *user, int *len); |
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#endif |
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/* Use the module struct to lock set/get code in place */ struct module *owner; |
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}; |
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/* Function to register/unregister hook points. */ |
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int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops); void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops); int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg, unsigned int n); void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg, unsigned int n); |
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/* 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); |
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#ifdef HAVE_JUMP_LABEL |
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extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
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#endif |
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int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state, |
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const struct nf_hook_entries *e, unsigned int i); |
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/** |
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* nf_hook - call a netfilter hook |
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* |
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* 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. */ |
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static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
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{ |
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struct nf_hook_entries *hook_head; |
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int ret = 1; |
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#ifdef HAVE_JUMP_LABEL if (__builtin_constant_p(pf) && __builtin_constant_p(hook) && !static_key_false(&nf_hooks_needed[pf][hook])) return 1; #endif |
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rcu_read_lock(); hook_head = rcu_dereference(net->nf.hooks[pf][hook]); if (hook_head) { |
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struct nf_hook_state state; |
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|
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nf_hook_state_init(&state, hook, pf, indev, outdev, |
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sk, net, okfn); |
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ret = nf_hook_slow(skb, &state, hook_head, 0); |
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} |
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rcu_read_unlock(); return ret; |
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} |
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/* 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 the consequences). Returns -ERRNO if packet dropped. Zero means queued, stolen or accepted. */ /* RR: > I don't want nf_hook to return anything because people might forget > about async and trust the return value to mean "packet was ok". AK: Just document it clearly, then you can expect some sense from kernel coders :) */ |
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static inline int |
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NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
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struct sk_buff *skb, struct net_device *in, struct net_device *out, |
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int (*okfn)(struct net *, struct sock *, struct sk_buff *), bool cond) |
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{ |
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int ret; if (!cond || |
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((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1)) |
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ret = okfn(net, sk, skb); |
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return ret; } |
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|
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static inline int |
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NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, |
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struct net_device *in, struct net_device *out, |
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int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
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{ |
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int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn); if (ret == 1) ret = okfn(net, sk, skb); return ret; |
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} |
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/* Call setsockopt() */ |
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int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
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unsigned int len); |
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int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
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int *len); |
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#ifdef CONFIG_COMPAT |
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int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
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char __user *opt, unsigned int len); |
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int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
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char __user *opt, int *len); |
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#endif |
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/* 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. */ |
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int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
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struct flowi; |
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struct nf_queue_entry; |
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|
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struct nf_afinfo { unsigned short family; |
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__sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
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unsigned int dataoff, u_int8_t protocol); |
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__sum16 (*checksum_partial)(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, unsigned int len, u_int8_t protocol); |
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int (*route)(struct net *net, struct dst_entry **dst, |
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struct flowi *fl, bool strict); |
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void (*saveroute)(const struct sk_buff *skb, |
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struct nf_queue_entry *entry); |
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int (*reroute)(struct net *net, struct sk_buff *skb, |
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const struct nf_queue_entry *entry); |
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int route_key_size; |
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}; |
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extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
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static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
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{ return rcu_dereference(nf_afinfo[family]); } |
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|
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static inline __sum16 |
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nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, u_int8_t protocol, unsigned short family) { |
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const struct nf_afinfo *afinfo; |
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__sum16 csum = 0; |
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rcu_read_lock(); afinfo = nf_get_afinfo(family); if (afinfo) csum = afinfo->checksum(skb, hook, dataoff, protocol); rcu_read_unlock(); return csum; } |
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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; } |
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int nf_register_afinfo(const struct nf_afinfo *afinfo); void nf_unregister_afinfo(const struct nf_afinfo *afinfo); |
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|
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#include <net/flow.h> |
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extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
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static inline void |
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nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
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{ |
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#ifdef CONFIG_NF_NAT_NEEDED |
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void (*decodefn)(struct sk_buff *, struct flowi *); |
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rcu_read_lock(); decodefn = rcu_dereference(nf_nat_decode_session_hook); if (decodefn) decodefn(skb, fl); rcu_read_unlock(); |
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#endif } |
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#else /* !CONFIG_NETFILTER */ |
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static inline int NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, struct net_device *in, struct net_device *out, int (*okfn)(struct net *, struct sock *, struct sk_buff *), bool cond) { return okfn(net, sk, skb); } static inline int NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, struct net_device *in, struct net_device *out, int (*okfn)(struct net *, struct sock *, struct sk_buff *)) { return okfn(net, sk, skb); } |
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static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, |
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int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
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{ |
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return 1; |
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} |
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struct flowi; |
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static inline void |
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nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) { } |
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#endif /*CONFIG_NETFILTER*/ |
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#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
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#include <linux/netfilter/nf_conntrack_zones_common.h> |
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extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
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void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
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extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
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#else static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} #endif |
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struct nf_conn; |
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enum ip_conntrack_info; |
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struct nlattr; |
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struct nfnl_ct_hook { |
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struct nf_conn *(*get_ct)(const struct sk_buff *skb, |
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enum ip_conntrack_info *ctinfo); |
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size_t (*build_size)(const struct nf_conn *ct); |
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int (*build)(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, u_int16_t ct_attr, u_int16_t ct_info_attr); |
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int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
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int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, u32 portid, u32 report); |
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void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
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enum ip_conntrack_info ctinfo, s32 off); |
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383 |
}; |
a4b4766c3 netfilter: nfnetl... |
384 |
extern struct nfnl_ct_hook __rcu *nfnl_ct_hook; |
5f79e0f91 [NETFILTER]: nf_c... |
385 |
|
e7c8899f3 netfilter: move t... |
386 387 388 389 390 391 392 393 394 395 |
/** * nf_skb_duplicated - TEE target has sent a packet * * When a xtables target sends a packet, the OUTPUT and POSTROUTING * hooks are traversed again, i.e. nft and xtables are invoked recursively. * * This is used by xtables TEE target to prevent the duplicated skb from * being duplicated again. */ DECLARE_PER_CPU(bool, nf_skb_duplicated); |
1da177e4c Linux-2.6.12-rc2 |
396 |
#endif /*__LINUX_NETFILTER_H*/ |