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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
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#include <linux/init.h>#include <linux/skbuff.h>#include <linux/net.h>#include <linux/if.h>#include <linux/in.h>#include <linux/in6.h>#include <linux/wait.h>#include <linux/list.h>#include <linux/static_key.h>#include <linux/module.h>#include <linux/netfilter_defs.h>#include <linux/netdevice.h>#include <linux/sockptr.h>#include <net/net_namespace.h>
static inline int NF_DROP_GETERR(int verdict){ return -(verdict >> NF_VERDICT_QBITS);}
static __always_inline intNF_DROP_REASON(struct sk_buff *skb, enum skb_drop_reason reason, u32 err){ BUILD_BUG_ON(err > 0xffff);
kfree_skb_reason(skb, reason);
return ((err << 16) | NF_STOLEN);}
static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, const union nf_inet_addr *a2){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const unsigned long *ul1 = (const unsigned long *)a1; const unsigned long *ul2 = (const unsigned long *)a2;
return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;#else 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];#endif}
static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, union nf_inet_addr *result, const union nf_inet_addr *mask){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const unsigned long *ua = (const unsigned long *)a1; unsigned long *ur = (unsigned long *)result; const unsigned long *um = (const unsigned long *)mask;
ur[0] = ua[0] & um[0]; ur[1] = ua[1] & um[1];#else 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];#endif}
int netfilter_init(void);
struct sk_buff;
struct nf_hook_ops;
struct sock;
struct nf_hook_state { u8 hook; u8 pf; struct net_device *in; struct net_device *out; struct sock *sk; struct net *net; int (*okfn)(struct net *, struct sock *, struct sk_buff *);};
typedef unsigned int nf_hookfn(void *priv, struct sk_buff *skb, const struct nf_hook_state *state);enum nf_hook_ops_type { NF_HOOK_OP_UNDEFINED, NF_HOOK_OP_NF_TABLES, NF_HOOK_OP_BPF, NF_HOOK_OP_NFT_FT, NF_HOOK_OP_NAT,};
struct nf_hook_ops { struct list_head list; struct rcu_head rcu;
/* User fills in from here down. */ nf_hookfn *hook; struct net_device *dev; void *priv; u8 pf; enum nf_hook_ops_type hook_ops_type:8; unsigned int hooknum; /* Hooks are ordered in ascending priority. */ int priority;};
struct nf_hook_entry { nf_hookfn *hook; void *priv;};
struct nf_hook_entries_rcu_head { struct rcu_head head; void *allocation;};
struct nf_hook_entries { u16 num_hook_entries; /* padding */ struct nf_hook_entry hooks[];
/* trailer: pointers to original orig_ops of each hook, * followed by rcu_head and scratch space used for freeing * the structure via call_rcu. * * 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[] * * For the same reason, we store this at end -- its * only needed when a hook is deleted, not during * packet path processing: * struct nf_hook_entries_rcu_head head */};
struct nf_nat_lookup_hook_priv { struct nf_hook_entries __rcu *entries;
struct rcu_head rcu_head;};
#ifdef CONFIG_NETFILTERstatic inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e){ 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;}
static inline intnf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, struct nf_hook_state *state){ return entry->hook(entry->priv, skb, state);}
static inline void nf_hook_state_init(struct nf_hook_state *p, unsigned int hook, u_int8_t pf, struct net_device *indev, struct net_device *outdev, struct sock *sk, struct net *net, int (*okfn)(struct net *, struct sock *, struct sk_buff *)){ p->hook = hook; p->pf = pf; p->in = indev; p->out = outdev; p->sk = sk; p->net = net; p->okfn = okfn;}
struct nf_sockopt_ops { struct list_head list;
u_int8_t pf;
/* Non-inclusive ranges: use 0/0/NULL to never get called. */ int set_optmin; int set_optmax; int (*set)(struct sock *sk, int optval, sockptr_t arg, unsigned int len); int get_optmin; int get_optmax; int (*get)(struct sock *sk, int optval, void __user *user, int *len); /* Use the module struct to lock set/get code in place */ struct module *owner;};
/* Function to register/unregister hook points. */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);
/* 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_JUMP_LABELextern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];#endif
int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state, const struct nf_hook_entries *e, unsigned int i);
void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state, const struct nf_hook_entries *e);/** * nf_hook - 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(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 *)){ struct nf_hook_entries *hook_head = NULL; int ret = 1;
#ifdef CONFIG_JUMP_LABEL if (__builtin_constant_p(pf) && __builtin_constant_p(hook) && !static_key_false(&nf_hooks_needed[pf][hook])) return 1;#endif
rcu_read_lock(); switch (pf) { case NFPROTO_IPV4: hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]); break; case NFPROTO_IPV6: hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]); break; case NFPROTO_ARP:#ifdef CONFIG_NETFILTER_FAMILY_ARP if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp))) break; hook_head = rcu_dereference(net->nf.hooks_arp[hook]);#endif break; case NFPROTO_BRIDGE:#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);#endif break; default: WARN_ON_ONCE(1); break; }
if (hook_head) { struct nf_hook_state state;
nf_hook_state_init(&state, hook, pf, indev, outdev, sk, net, okfn);
ret = nf_hook_slow(skb, &state, hook_head, 0); } rcu_read_unlock();
return ret;}
/* 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 :)*/
static inline intNF_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){ int ret;
if (!cond || ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1)) ret = okfn(net, sk, skb); return ret;}
static inline intNF_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 *)){ int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn); if (ret == 1) ret = okfn(net, sk, skb); return ret;}
static inline voidNF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct list_head *head, struct net_device *in, struct net_device *out, int (*okfn)(struct net *, struct sock *, struct sk_buff *)){ struct nf_hook_entries *hook_head = NULL;
#ifdef CONFIG_JUMP_LABEL if (__builtin_constant_p(pf) && __builtin_constant_p(hook) && !static_key_false(&nf_hooks_needed[pf][hook])) return;#endif
rcu_read_lock(); switch (pf) { case NFPROTO_IPV4: hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]); break; case NFPROTO_IPV6: hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]); break; default: WARN_ON_ONCE(1); break; }
if (hook_head) { struct nf_hook_state state;
nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn);
nf_hook_slow_list(head, &state, hook_head); } rcu_read_unlock();}
/* Call setsockopt() */int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt, unsigned int len);int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, int *len);
struct flowi;struct nf_queue_entry;
__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, u_int8_t protocol, unsigned short family);
__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, unsigned int len, u_int8_t protocol, unsigned short family);int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl, bool strict, unsigned short family);
#include <net/flow.h>
struct nf_conn;enum nf_nat_manip_type;struct nlattr;
struct nf_nat_hook { int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip, const struct nlattr *attr); void (*decode_session)(struct sk_buff *skb, struct flowi *fl); void (*remove_nat_bysrc)(struct nf_conn *ct);};
extern const struct nf_nat_hook __rcu *nf_nat_hook;
static inline voidnf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family){#if IS_ENABLED(CONFIG_NF_NAT) const struct nf_nat_hook *nat_hook;
rcu_read_lock(); nat_hook = rcu_dereference(nf_nat_hook); if (nat_hook && nat_hook->decode_session) nat_hook->decode_session(skb, fl); rcu_read_unlock();#endif}
#else /* !CONFIG_NETFILTER */static inline intNF_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 intNF_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);}
static inline voidNF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct list_head *head, struct net_device *in, struct net_device *out, int (*okfn)(struct net *, struct sock *, struct sk_buff *)){ /* nothing to do */}
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 *)){ return 1;}struct flowi;static inline voidnf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family){}#endif /*CONFIG_NETFILTER*/
#if IS_ENABLED(CONFIG_NF_CONNTRACK)#include <linux/netfilter/nf_conntrack_zones_common.h>
void nf_ct_attach(struct sk_buff *, const struct sk_buff *);void nf_ct_set_closing(struct nf_conntrack *nfct);struct nf_conntrack_tuple;bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, const struct sk_buff *skb);#elsestatic inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}static inline void nf_ct_set_closing(struct nf_conntrack *nfct) {}struct nf_conntrack_tuple;static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, const struct sk_buff *skb){ return false;}#endif
struct nf_conn;enum ip_conntrack_info;
struct nf_ct_hook { int (*update)(struct net *net, struct sk_buff *skb); void (*destroy)(struct nf_conntrack *); bool (*get_tuple_skb)(struct nf_conntrack_tuple *, const struct sk_buff *); void (*attach)(struct sk_buff *nskb, const struct sk_buff *skb); void (*set_closing)(struct nf_conntrack *nfct); int (*confirm)(struct sk_buff *skb); u32 (*get_id)(const struct nf_conntrack *nfct);};extern const struct nf_ct_hook __rcu *nf_ct_hook;
struct nlattr;
struct nfnl_ct_hook { size_t (*build_size)(const struct nf_conn *ct); 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); int (*parse)(const struct nlattr *attr, struct nf_conn *ct); int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, u32 portid, u32 report); void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, s32 off);};extern const struct nfnl_ct_hook __rcu *nfnl_ct_hook;
struct nf_defrag_hook { struct module *owner; int (*enable)(struct net *net); void (*disable)(struct net *net);};
extern const struct nf_defrag_hook __rcu *nf_defrag_v4_hook;extern const struct nf_defrag_hook __rcu *nf_defrag_v6_hook;
/* * Contains bitmask of ctnetlink event subscribers, if any. * Can't be pernet due to NETLINK_LISTEN_ALL_NSID setsockopt flag. */extern u8 nf_ctnetlink_has_listener;#endif /*__LINUX_NETFILTER_H*/