cregit-Linux how code gets into the kernel

Release 4.15 include/net/ip_fib.h

Directory: include/net
/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET  is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the Forwarding Information Base.
 *
 * Authors:     A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */

#ifndef _NET_IP_FIB_H

#define _NET_IP_FIB_H

#include <net/flow.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <net/fib_notifier.h>
#include <net/fib_rules.h>
#include <net/inetpeer.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/refcount.h>


struct fib_config {
	
u8			fc_dst_len;
	
u8			fc_tos;
	
u8			fc_protocol;
	
u8			fc_scope;
	
u8			fc_type;
	/* 3 bytes unused */
	
u32			fc_table;
	
__be32			fc_dst;
	
__be32			fc_gw;
	
int			fc_oif;
	
u32			fc_flags;
	
u32			fc_priority;
	
__be32			fc_prefsrc;
	
struct nlattr		*fc_mx;
	
struct rtnexthop	*fc_mp;
	
int			fc_mx_len;
	
int			fc_mp_len;
	
u32			fc_flow;
	
u32			fc_nlflags;
	
struct nl_info		fc_nlinfo;
	
struct nlattr		*fc_encap;
	
u16			fc_encap_type;
};

struct fib_info;
struct rtable;


struct fib_nh_exception {
	
struct fib_nh_exception __rcu	*fnhe_next;
	
int				fnhe_genid;
	
__be32				fnhe_daddr;
	
u32				fnhe_pmtu;
	
__be32				fnhe_gw;
	
unsigned long			fnhe_expires;
	
struct rtable __rcu		*fnhe_rth_input;
	
struct rtable __rcu		*fnhe_rth_output;
	
unsigned long			fnhe_stamp;
	
struct rcu_head			rcu;
};


struct fnhe_hash_bucket {
	
struct fib_nh_exception __rcu	*chain;
};


#define FNHE_HASH_SHIFT		11

#define FNHE_HASH_SIZE		(1 << FNHE_HASH_SHIFT)

#define FNHE_RECLAIM_DEPTH	5


struct fib_nh {
	
struct net_device	*nh_dev;
	
struct hlist_node	nh_hash;
	
struct fib_info		*nh_parent;
	
unsigned int		nh_flags;
	
unsigned char		nh_scope;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
	
int			nh_weight;
	
atomic_t		nh_upper_bound;
#endif
#ifdef CONFIG_IP_ROUTE_CLASSID
	
__u32			nh_tclassid;
#endif
	
int			nh_oif;
	
__be32			nh_gw;
	
__be32			nh_saddr;
	
int			nh_saddr_genid;
	
struct rtable __rcu * __percpu *nh_pcpu_rth_output;
	
struct rtable __rcu	*nh_rth_input;
	
struct fnhe_hash_bucket	__rcu *nh_exceptions;
	
struct lwtunnel_state	*nh_lwtstate;
};

/*
 * This structure contains data shared by many of routes.
 */


struct fib_info {
	
struct hlist_node	fib_hash;
	
struct hlist_node	fib_lhash;
	
struct net		*fib_net;
	
int			fib_treeref;
	
refcount_t		fib_clntref;
	
unsigned int		fib_flags;
	
unsigned char		fib_dead;
	
unsigned char		fib_protocol;
	
unsigned char		fib_scope;
	
unsigned char		fib_type;
	
__be32			fib_prefsrc;
	
u32			fib_tb_id;
	
u32			fib_priority;
	
struct dst_metrics	*fib_metrics;

#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]

#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]

#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]

#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
	
int			fib_nhs;
	
struct rcu_head		rcu;
	
struct fib_nh		fib_nh[0];

#define fib_dev		fib_nh[0].nh_dev
};


#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_rule;
#endif

struct fib_table;

struct fib_result {
	
__be32		prefix;
	
unsigned char	prefixlen;
	
unsigned char	nh_sel;
	
unsigned char	type;
	
unsigned char	scope;
	
u32		tclassid;
	
struct fib_info *fi;
	
struct fib_table *table;
	
struct hlist_head *fa_head;
};


struct fib_result_nl {
	
__be32		fl_addr;   /* To be looked up*/
	
u32		fl_mark;
	
unsigned char	fl_tos;
	
unsigned char   fl_scope;
	
unsigned char   tb_id_in;

	
unsigned char   tb_id;      /* Results */
	
unsigned char	prefixlen;
	
unsigned char	nh_sel;
	
unsigned char	type;
	
unsigned char	scope;
	
int             err;      
};

#ifdef CONFIG_IP_ROUTE_MULTIPATH

#define FIB_RES_NH(res)		((res).fi->fib_nh[(res).nh_sel])
#else /* CONFIG_IP_ROUTE_MULTIPATH */

#define FIB_RES_NH(res)		((res).fi->fib_nh[0])
#endif /* CONFIG_IP_ROUTE_MULTIPATH */

#ifdef CONFIG_IP_MULTIPLE_TABLES

#define FIB_TABLE_HASHSZ 256
#else

#define FIB_TABLE_HASHSZ 2
#endif

__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);


#define FIB_RES_SADDR(net, res)				\
	((FIB_RES_NH(res).nh_saddr_genid ==             \
          atomic_read(&(net)->ipv4.dev_addr_genid)) ?   \
         FIB_RES_NH(res).nh_saddr :                     \
         fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))

#define FIB_RES_GW(res)			(FIB_RES_NH(res).nh_gw)

#define FIB_RES_DEV(res)		(FIB_RES_NH(res).nh_dev)

#define FIB_RES_OIF(res)		(FIB_RES_NH(res).nh_oif)


#define FIB_RES_PREFSRC(net, res)	((res).fi->fib_prefsrc ? : \
                                         FIB_RES_SADDR(net, res))


struct fib_entry_notifier_info {
	
struct fib_notifier_info info; /* must be first */
	
u32 dst;
	
int dst_len;
	
struct fib_info *fi;
	
u8 tos;
	
u8 type;
	
u32 tb_id;
};


struct fib_nh_notifier_info {
	
struct fib_notifier_info info; /* must be first */
	
struct fib_nh *fib_nh;
};

int call_fib4_notifier(struct notifier_block *nb, struct net *net,
		       enum fib_event_type event_type,
		       struct fib_notifier_info *info);
int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
			struct fib_notifier_info *info);

int __net_init fib4_notifier_init(struct net *net);
void __net_exit fib4_notifier_exit(struct net *net);

void fib_notify(struct net *net, struct notifier_block *nb);


struct fib_table {
	
struct hlist_node	tb_hlist;
	
u32			tb_id;
	
int			tb_num_default;
	
struct rcu_head		rcu;
	
unsigned long 		*tb_data;
	
unsigned long		__data[0];
};

int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
		     struct fib_result *res, int fib_flags);
int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
		     struct netlink_ext_ack *extack);
int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
		     struct netlink_ext_ack *extack);
int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
		   struct netlink_callback *cb);
int fib_table_flush(struct net *net, struct fib_table *table);
struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
void fib_table_flush_external(struct fib_table *table);
void fib_free_table(struct fib_table *tb);

#ifndef CONFIG_IP_MULTIPLE_TABLES


#define TABLE_LOCAL_INDEX	(RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))

#define TABLE_MAIN_INDEX	(RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 1))


static inline struct fib_table *fib_get_table(struct net *net, u32 id) { struct hlist_node *tb_hlist; struct hlist_head *ptr; ptr = id == RT_TABLE_LOCAL ? &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); return hlist_entry(tb_hlist, struct fib_table, tb_hlist); }

Contributors

PersonTokensPropCommitsCommitProp
Denis V. Lunev4256.76%342.86%
Alexander Duyck1621.62%114.29%
Linus Torvalds (pre-git)1520.27%228.57%
Patrick McHardy11.35%114.29%
Total74100.00%7100.00%


static inline struct fib_table *fib_new_table(struct net *net, u32 id) { return fib_get_table(net, id); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1768.00%250.00%
Denis V. Lunev728.00%125.00%
Patrick McHardy14.00%125.00%
Total25100.00%4100.00%


static inline int fib_lookup(struct net *net, const struct flowi4 *flp, struct fib_result *res, unsigned int flags) { struct fib_table *tb; int err = -ENETUNREACH; rcu_read_lock(); tb = fib_get_table(net, RT_TABLE_MAIN); if (tb) err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); if (err == -EAGAIN) err = -ENETUNREACH; rcu_read_unlock(); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck3540.23%325.00%
Linus Torvalds (pre-git)2225.29%216.67%
Nikola Forró1213.79%18.33%
Denis V. Lunev78.05%216.67%
Andy Gospodarek66.90%18.33%
David S. Miller33.45%216.67%
Eric Dumazet22.30%18.33%
Total87100.00%12100.00%


static inline bool fib4_rule_default(const struct fib_rule *rule) { return true; }

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PersonTokensPropCommitsCommitProp
Ido Schimmel16100.00%1100.00%
Total16100.00%1100.00%


static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ido Schimmel20100.00%1100.00%
Total20100.00%1100.00%


static inline unsigned int fib4_rules_seq_read(struct net *net) { return 0; }

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PersonTokensPropCommitsCommitProp
Ido Schimmel16100.00%1100.00%
Total16100.00%1100.00%

#else /* CONFIG_IP_MULTIPLE_TABLES */ int __net_init fib4_rules_init(struct net *net); void __net_exit fib4_rules_exit(struct net *net); struct fib_table *fib_new_table(struct net *net, u32 id); struct fib_table *fib_get_table(struct net *net, u32 id); int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res, unsigned int flags);
static inline int fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res, unsigned int flags) { struct fib_table *tb; int err = -ENETUNREACH; flags |= FIB_LOOKUP_NOREF; if (net->ipv4.fib_has_custom_rules) return __fib_lookup(net, flp, res, flags); rcu_read_lock(); res->tclassid = 0; tb = rcu_dereference_rtnl(net->ipv4.fib_main); if (tb) err = fib_table_lookup(tb, flp, res, flags); if (!err) goto out; tb = rcu_dereference_rtnl(net->ipv4.fib_default); if (tb) err = fib_table_lookup(tb, flp, res, flags); out: if (err == -EAGAIN) err = -ENETUNREACH; rcu_read_unlock(); return err; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller6542.21%342.86%
Alexander Duyck4629.87%228.57%
Nikola Forró3120.13%114.29%
Andy Gospodarek127.79%114.29%
Total154100.00%7100.00%

bool fib4_rule_default(const struct fib_rule *rule); int fib4_rules_dump(struct net *net, struct notifier_block *nb); unsigned int fib4_rules_seq_read(struct net *net); #endif /* CONFIG_IP_MULTIPLE_TABLES */ /* Exported by fib_frontend.c */ extern const struct nla_policy rtm_ipv4_policy[]; void ip_fib_init(void); __be32 fib_compute_spec_dst(struct sk_buff *skb); int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos, int oif, struct net_device *dev, struct in_device *idev, u32 *itag); #ifdef CONFIG_IP_ROUTE_CLASSID
static inline int fib_num_tclassid_users(struct net *net) { return net->ipv4.fib_num_tclassid_users; }

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PersonTokensPropCommitsCommitProp
David S. Miller19100.00%2100.00%
Total19100.00%2100.00%

#else
static inline int fib_num_tclassid_users(struct net *net) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller15100.00%2100.00%
Total15100.00%2100.00%

#endif int fib_unmerge(struct net *net); /* Exported by fib_semantics.c */ int ip_fib_check_default(__be32 gw, struct net_device *dev); int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); int fib_sync_down_addr(struct net_device *dev, __be32 local); int fib_sync_up(struct net_device *dev, unsigned int nh_flags); #ifdef CONFIG_IP_ROUTE_MULTIPATH int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, const struct sk_buff *skb); #endif void fib_select_multipath(struct fib_result *res, int hash); void fib_select_path(struct net *net, struct fib_result *res, struct flowi4 *fl4, const struct sk_buff *skb); /* Exported by fib_trie.c */ void fib_trie_init(void); struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) { #ifdef CONFIG_IP_ROUTE_CLASSID #ifdef CONFIG_IP_MULTIPLE_TABLES u32 rtag; #endif *itag = FIB_RES_NH(*res).nh_tclassid<<16; #ifdef CONFIG_IP_MULTIPLE_TABLES rtag = res->tclassid; if (*itag == 0) *itag = (rtag<<16); *itag |= (rtag>>16); #endif #endif }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7594.94%240.00%
David S. Miller33.80%240.00%
Patrick McHardy11.27%120.00%
Total79100.00%5100.00%

void free_fib_info(struct fib_info *fi);
static inline void fib_info_hold(struct fib_info *fi) { refcount_inc(&fi->fib_clntref); }

Contributors

PersonTokensPropCommitsCommitProp
Ido Schimmel1995.00%150.00%
Elena Reshetova15.00%150.00%
Total20100.00%2100.00%


static inline void fib_info_put(struct fib_info *fi) { if (refcount_dec_and_test(&fi->fib_clntref)) free_fib_info(fi); }

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PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2696.30%266.67%
Elena Reshetova13.70%133.33%
Total27100.00%3100.00%

#ifdef CONFIG_PROC_FS int __net_init fib_proc_init(struct net *net); void __net_exit fib_proc_exit(struct net *net); #else
static inline int fib_proc_init(struct net *net) { return 0; }

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PersonTokensPropCommitsCommitProp
Li Zefan15100.00%1100.00%
Total15100.00%1100.00%


static inline void fib_proc_exit(struct net *net) { }

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PersonTokensPropCommitsCommitProp
Li Zefan11100.00%1100.00%
Total11100.00%1100.00%

#endif #endif /* _NET_FIB_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)51829.02%109.09%
David S. Miller31617.70%2421.82%
Ido Schimmel1789.97%76.36%
Alexander Duyck1438.01%65.45%
Denis V. Lunev1397.79%1210.91%
Jiri Pirko663.70%10.91%
Thomas Graf553.08%54.55%
Robert Olsson462.58%10.91%
Nikola Forró432.41%10.91%
Eric Dumazet351.96%87.27%
David Ahern331.85%43.64%
Andy Gospodarek291.62%21.82%
Li Zefan281.57%10.91%
Nikolay Aleksandrov271.51%10.91%
Arnaldo Carvalho de Melo181.01%21.82%
Stephen Hemminger181.01%21.82%
Patrick McHardy130.73%43.64%
Pavel Emelyanov130.73%21.82%
Roopa Prabhu130.73%10.91%
Peter Christensen100.56%10.91%
Timo Teräs100.56%21.82%
Al Viro90.50%65.45%
Elena Reshetova60.34%10.91%
Mark Tomlinson50.28%10.91%
Michael Smith50.28%10.91%
Julian Anastasov40.22%21.82%
Xin Long40.22%10.91%
Linus Torvalds10.06%10.91%
Total1785100.00%110100.00%
Directory: include/net
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