2020 internships

U-Boot, Linux, Elixir

2020 internships

U-Boot, Linux, Elixir

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Elixir Cross Referencer

 *	Linux INET6 implementation 
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>	
 *	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 _IP6_FIB_H
#define _IP6_FIB_H

#include <linux/ipv6_route.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/netlink.h>
#include <net/inetpeer.h>

#define FIB6_TABLE_HASHSZ 256

struct rt6_info;

struct fib6_config {
	u32		fc_table;
	u32		fc_metric;
	int		fc_dst_len;
	int		fc_src_len;
	int		fc_ifindex;
	u32		fc_flags;
	u32		fc_protocol;
	u32		fc_type;	/* only 8 bits are used */

	struct in6_addr	fc_dst;
	struct in6_addr	fc_src;
	struct in6_addr	fc_prefsrc;
	struct in6_addr	fc_gateway;

	unsigned long	fc_expires;
	struct nlattr	*fc_mx;
	int		fc_mx_len;
	int		fc_mp_len;
	struct nlattr	*fc_mp;

	struct nl_info	fc_nlinfo;

struct fib6_node {
	struct fib6_node	*parent;
	struct fib6_node	*left;
	struct fib6_node	*right;
	struct fib6_node	*subtree;
	struct rt6_info		*leaf;

	__u16			fn_bit;		/* bit key */
	__u16			fn_flags;
	__u32			fn_sernum;
	struct rt6_info		*rr_ptr;

#define FIB6_SUBTREE(fn)	NULL
#define FIB6_SUBTREE(fn)	((fn)->subtree)

 *	routing information

struct rt6key {
	struct in6_addr	addr;
	int		plen;

struct fib6_table;

struct rt6_info {
	struct dst_entry		dst;

	 * Tail elements of dst_entry (__refcnt etc.)
	 * and these elements (rarely used in hot path) are in
	 * the same cache line.
	struct fib6_table		*rt6i_table;
	struct fib6_node		*rt6i_node;

	struct in6_addr			rt6i_gateway;

	/* Multipath routes:
	 * siblings is a list of rt6_info that have the the same metric/weight,
	 * destination, but not the same gateway. nsiblings is just a cache
	 * to speed up lookup.
	struct list_head		rt6i_siblings;
	unsigned int			rt6i_nsiblings;

	atomic_t			rt6i_ref;

	/* These are in a separate cache line. */
	struct rt6key			rt6i_dst ____cacheline_aligned_in_smp;
	u32				rt6i_flags;
	struct rt6key			rt6i_src;
	struct rt6key			rt6i_prefsrc;
	u32				rt6i_metric;

	struct inet6_dev		*rt6i_idev;
	unsigned long			_rt6i_peer;

	u32				rt6i_genid;

	/* more non-fragment space at head required */
	unsigned short			rt6i_nfheader_len;

	u8				rt6i_protocol;

static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
	return inetpeer_ptr(rt->_rt6i_peer);

static inline bool rt6_has_peer(struct rt6_info *rt)
	return inetpeer_ptr_is_peer(rt->_rt6i_peer);

static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
	__inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);

static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
	return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);

static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
	inetpeer_init_ptr(&rt->_rt6i_peer, base);

static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
	inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);

static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
	return ((struct rt6_info *)dst)->rt6i_idev;

static inline void rt6_clean_expires(struct rt6_info *rt)
	rt->rt6i_flags &= ~RTF_EXPIRES;

static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
	rt->dst.expires = expires;
	rt->rt6i_flags |= RTF_EXPIRES;

static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
	struct rt6_info *rt;

	for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
	     rt = (struct rt6_info *)rt->dst.from);
	if (rt && rt != rt0)
		rt0->dst.expires = rt->dst.expires;

	dst_set_expires(&rt0->dst, timeout);
	rt0->rt6i_flags |= RTF_EXPIRES;

static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
	struct dst_entry *new = (struct dst_entry *) from;

	rt->rt6i_flags &= ~RTF_EXPIRES;
	rt->dst.from = new;

static inline void ip6_rt_put(struct rt6_info *rt)
	/* dst_release() accepts a NULL parameter.
	 * We rely on dst being first structure in struct rt6_info
	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);

struct fib6_walker_t {
	struct list_head lh;
	struct fib6_node *root, *node;
	struct rt6_info *leaf;
	unsigned char state;
	unsigned char prune;
	unsigned int skip;
	unsigned int count;
	int (*func)(struct fib6_walker_t *);
	void *args;

struct rt6_statistics {
	__u32		fib_nodes;
	__u32		fib_route_nodes;
	__u32		fib_rt_alloc;		/* permanent routes	*/
	__u32		fib_rt_entries;		/* rt entries in table	*/
	__u32		fib_rt_cache;		/* cache routes		*/
	__u32		fib_discarded_routes;

#define RTN_TL_ROOT	0x0001
#define RTN_ROOT	0x0002		/* tree root node		*/
#define RTN_RTINFO	0x0004		/* node with valid routing info	*/

 *	priority levels (or metrics)

struct fib6_table {
	struct hlist_node	tb6_hlist;
	u32			tb6_id;
	rwlock_t		tb6_lock;
	struct fib6_node	tb6_root;
	struct inet_peer_base	tb6_peers;


#define FIB6_TABLE_MIN		1

typedef struct rt6_info *(*pol_lookup_t)(struct net *,
					 struct fib6_table *,
					 struct flowi6 *, int);

 *	exported functions

extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
extern struct dst_entry         *fib6_rule_lookup(struct net *net,
						  struct flowi6 *fl6, int flags,
						  pol_lookup_t lookup);

extern struct fib6_node		*fib6_lookup(struct fib6_node *root,
					     const struct in6_addr *daddr,
					     const struct in6_addr *saddr);

struct fib6_node		*fib6_locate(struct fib6_node *root,
					     const struct in6_addr *daddr, int dst_len,
					     const struct in6_addr *saddr, int src_len);

extern void			fib6_clean_all_ro(struct net *net,
					       int (*func)(struct rt6_info *, void *arg),
					       int prune, void *arg);

extern void			fib6_clean_all(struct net *net,
					       int (*func)(struct rt6_info *, void *arg),
					       int prune, void *arg);

extern int			fib6_add(struct fib6_node *root,
					 struct rt6_info *rt,
					 struct nl_info *info);

extern int			fib6_del(struct rt6_info *rt,
					 struct nl_info *info);

extern void			inet6_rt_notify(int event, struct rt6_info *rt,
						struct nl_info *info);

extern void			fib6_run_gc(unsigned long expires,
					    struct net *net);

extern void			fib6_gc_cleanup(void);

extern int			fib6_init(void);

extern int			fib6_rules_init(void);
extern void			fib6_rules_cleanup(void);
static inline int               fib6_rules_init(void)
	return 0;
static inline void              fib6_rules_cleanup(void)
	return ;