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491 lines
13 KiB
491 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_NETFILTER_H |
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#define __LINUX_NETFILTER_H |
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#include <linux/init.h> |
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#include <linux/skbuff.h> |
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#include <linux/net.h> |
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#include <linux/if.h> |
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#include <linux/in.h> |
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#include <linux/in6.h> |
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#include <linux/wait.h> |
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#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> |
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#include <linux/sockptr.h> |
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#include <net/net_namespace.h> |
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static inline int NF_DROP_GETERR(int verdict) |
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{ |
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return -(verdict >> NF_VERDICT_QBITS); |
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} |
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static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
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const union nf_inet_addr *a2) |
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{ |
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
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const unsigned long *ul1 = (const unsigned long *)a1; |
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const unsigned long *ul2 = (const unsigned long *)a2; |
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return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; |
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#else |
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return a1->all[0] == a2->all[0] && |
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a1->all[1] == a2->all[1] && |
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a1->all[2] == a2->all[2] && |
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a1->all[3] == a2->all[3]; |
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#endif |
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} |
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static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
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union nf_inet_addr *result, |
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const union nf_inet_addr *mask) |
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{ |
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
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const unsigned long *ua = (const unsigned long *)a1; |
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unsigned long *ur = (unsigned long *)result; |
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const unsigned long *um = (const unsigned long *)mask; |
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ur[0] = ua[0] & um[0]; |
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ur[1] = ua[1] & um[1]; |
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#else |
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result->all[0] = a1->all[0] & mask->all[0]; |
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result->all[1] = a1->all[1] & mask->all[1]; |
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result->all[2] = a1->all[2] & mask->all[2]; |
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result->all[3] = a1->all[3] & mask->all[3]; |
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#endif |
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} |
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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 { |
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u8 hook; |
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u8 pf; |
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struct net_device *in; |
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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, |
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struct sk_buff *skb, |
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const struct nf_hook_state *state); |
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enum nf_hook_ops_type { |
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NF_HOOK_OP_UNDEFINED, |
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NF_HOOK_OP_NF_TABLES, |
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}; |
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struct nf_hook_ops { |
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/* User fills in from here down. */ |
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nf_hookfn *hook; |
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struct net_device *dev; |
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void *priv; |
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u8 pf; |
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enum nf_hook_ops_type hook_ops_type:8; |
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unsigned int hooknum; |
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/* Hooks are ordered in ascending priority. */ |
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int priority; |
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}; |
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struct nf_hook_entry { |
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nf_hookfn *hook; |
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void *priv; |
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}; |
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struct nf_hook_entries_rcu_head { |
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struct rcu_head head; |
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void *allocation; |
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}; |
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struct nf_hook_entries { |
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u16 num_hook_entries; |
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/* padding */ |
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struct nf_hook_entry hooks[]; |
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/* trailer: pointers to original orig_ops of each hook, |
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* followed by rcu_head and scratch space used for freeing |
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* the structure via call_rcu. |
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* |
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* This is not part of struct nf_hook_entry since its only |
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* needed in slow path (hook register/unregister): |
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* const struct nf_hook_ops *orig_ops[] |
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* |
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* For the same reason, we store this at end -- its |
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* only needed when a hook is deleted, not during |
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* packet path processing: |
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* struct nf_hook_entries_rcu_head head |
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*/ |
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}; |
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#ifdef CONFIG_NETFILTER |
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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; |
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const void *hook_end; |
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hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */ |
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return (struct nf_hook_ops **)hook_end; |
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} |
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static inline int |
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nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, |
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struct nf_hook_state *state) |
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{ |
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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, |
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unsigned int hook, |
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u_int8_t pf, |
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struct net_device *indev, |
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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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{ |
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p->hook = hook; |
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p->pf = pf; |
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p->in = indev; |
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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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} |
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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. */ |
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int set_optmin; |
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int set_optmax; |
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int (*set)(struct sock *sk, int optval, sockptr_t arg, |
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unsigned int len); |
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int get_optmin; |
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int get_optmax; |
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int (*get)(struct sock *sk, int optval, void __user *user, int *len); |
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/* Use the module struct to lock set/get code in place */ |
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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); |
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void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops); |
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int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg, |
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unsigned int n); |
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void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg, |
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unsigned int n); |
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/* Functions to register get/setsockopt ranges (non-inclusive). You |
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need to check permissions yourself! */ |
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int nf_register_sockopt(struct nf_sockopt_ops *reg); |
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void nf_unregister_sockopt(struct nf_sockopt_ops *reg); |
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#ifdef CONFIG_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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void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state, |
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const struct nf_hook_entries *e); |
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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 |
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* okfn must be invoked by the caller in this case. Any other return |
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* value indicates the packet has been consumed by the hook. |
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*/ |
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static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
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struct sock *sk, struct sk_buff *skb, |
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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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struct nf_hook_entries *hook_head = NULL; |
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int ret = 1; |
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#ifdef CONFIG_JUMP_LABEL |
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if (__builtin_constant_p(pf) && |
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__builtin_constant_p(hook) && |
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!static_key_false(&nf_hooks_needed[pf][hook])) |
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return 1; |
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#endif |
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rcu_read_lock(); |
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switch (pf) { |
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case NFPROTO_IPV4: |
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hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]); |
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break; |
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case NFPROTO_IPV6: |
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hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]); |
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break; |
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case NFPROTO_ARP: |
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#ifdef CONFIG_NETFILTER_FAMILY_ARP |
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if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp))) |
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break; |
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hook_head = rcu_dereference(net->nf.hooks_arp[hook]); |
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#endif |
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break; |
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case NFPROTO_BRIDGE: |
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#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE |
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hook_head = rcu_dereference(net->nf.hooks_bridge[hook]); |
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#endif |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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break; |
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} |
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if (hook_head) { |
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struct nf_hook_state state; |
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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(); |
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return ret; |
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} |
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/* Activate hook; either okfn or kfree_skb called, unless a hook |
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returns NF_STOLEN (in which case, it's up to the hook to deal with |
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the consequences). |
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Returns -ERRNO if packet dropped. Zero means queued, stolen or |
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accepted. |
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*/ |
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/* RR: |
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> I don't want nf_hook to return anything because people might forget |
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> about async and trust the return value to mean "packet was ok". |
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AK: |
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Just document it clearly, then you can expect some sense from kernel |
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coders :) |
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*/ |
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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 *), |
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bool cond) |
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{ |
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int ret; |
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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); |
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if (ret == 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 void |
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NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
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struct list_head *head, 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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struct nf_hook_entries *hook_head = NULL; |
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#ifdef CONFIG_JUMP_LABEL |
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if (__builtin_constant_p(pf) && |
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__builtin_constant_p(hook) && |
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!static_key_false(&nf_hooks_needed[pf][hook])) |
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return; |
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#endif |
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rcu_read_lock(); |
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switch (pf) { |
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case NFPROTO_IPV4: |
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hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]); |
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break; |
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case NFPROTO_IPV6: |
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hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]); |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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break; |
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} |
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if (hook_head) { |
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struct nf_hook_state state; |
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nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn); |
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nf_hook_slow_list(head, &state, hook_head); |
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} |
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rcu_read_unlock(); |
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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, sockptr_t 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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struct flowi; |
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struct nf_queue_entry; |
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__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook, |
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unsigned int dataoff, u_int8_t protocol, |
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unsigned short family); |
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__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook, |
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unsigned int dataoff, unsigned int len, |
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u_int8_t protocol, unsigned short family); |
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int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl, |
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bool strict, unsigned short family); |
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int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry); |
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#include <net/flow.h> |
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struct nf_conn; |
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enum nf_nat_manip_type; |
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struct nlattr; |
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enum ip_conntrack_dir; |
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struct nf_nat_hook { |
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int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip, |
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const struct nlattr *attr); |
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void (*decode_session)(struct sk_buff *skb, struct flowi *fl); |
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unsigned int (*manip_pkt)(struct sk_buff *skb, struct nf_conn *ct, |
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enum nf_nat_manip_type mtype, |
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enum ip_conntrack_dir dir); |
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void (*remove_nat_bysrc)(struct nf_conn *ct); |
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}; |
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extern const struct nf_nat_hook __rcu *nf_nat_hook; |
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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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#if IS_ENABLED(CONFIG_NF_NAT) |
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const struct nf_nat_hook *nat_hook; |
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rcu_read_lock(); |
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nat_hook = rcu_dereference(nf_nat_hook); |
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if (nat_hook && nat_hook->decode_session) |
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nat_hook->decode_session(skb, fl); |
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rcu_read_unlock(); |
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#endif |
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} |
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#else /* !CONFIG_NETFILTER */ |
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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 *), |
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bool cond) |
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{ |
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return okfn(net, sk, skb); |
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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, |
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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 *)) |
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{ |
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return okfn(net, sk, skb); |
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} |
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static inline void |
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NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
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struct list_head *head, 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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/* nothing to do */ |
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} |
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static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
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struct sock *sk, struct sk_buff *skb, |
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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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{ |
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} |
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#endif /*CONFIG_NETFILTER*/ |
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#if IS_ENABLED(CONFIG_NF_CONNTRACK) |
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#include <linux/netfilter/nf_conntrack_zones_common.h> |
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void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
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struct nf_conntrack_tuple; |
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bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, |
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const struct sk_buff *skb); |
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#else |
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static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} |
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struct nf_conntrack_tuple; |
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static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, |
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const struct sk_buff *skb) |
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{ |
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return false; |
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} |
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#endif |
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struct nf_conn; |
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enum ip_conntrack_info; |
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struct nf_ct_hook { |
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int (*update)(struct net *net, struct sk_buff *skb); |
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void (*destroy)(struct nf_conntrack *); |
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bool (*get_tuple_skb)(struct nf_conntrack_tuple *, |
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const struct sk_buff *); |
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void (*attach)(struct sk_buff *nskb, const struct sk_buff *skb); |
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}; |
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extern const struct nf_ct_hook __rcu *nf_ct_hook; |
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struct nlattr; |
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struct nfnl_ct_hook { |
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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, |
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enum ip_conntrack_info ctinfo, |
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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, |
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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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}; |
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extern const struct nfnl_ct_hook __rcu *nfnl_ct_hook; |
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/** |
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* nf_skb_duplicated - TEE target has sent a packet |
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* |
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* When a xtables target sends a packet, the OUTPUT and POSTROUTING |
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* hooks are traversed again, i.e. nft and xtables are invoked recursively. |
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* |
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* This is used by xtables TEE target to prevent the duplicated skb from |
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* being duplicated again. |
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*/ |
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DECLARE_PER_CPU(bool, nf_skb_duplicated); |
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#endif /*__LINUX_NETFILTER_H*/
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