forked from Minki/linux
edfb5d4687
Commit 1716a961 (ipv6: fix problem with expired dst cache) broke PMTU
discovery. rt6_update_expires() calls dst_set_expires(), which only updates
dst->expires if it has not been set previously (expires == 0) or if the new
expires is earlier than the current dst->expires.
rt6_update_expires() needs to zero rt->dst.expires, otherwise it will contain
ivalid data left over from rt->dst.from and will confuse dst_set_expires().
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
289 lines
6.4 KiB
C
289 lines
6.4 KiB
C
/*
|
|
* 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>
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
#define FIB6_TABLE_HASHSZ 256
|
|
#else
|
|
#define FIB6_TABLE_HASHSZ 1
|
|
#endif
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
struct nl_info fc_nlinfo;
|
|
};
|
|
|
|
struct fib6_node {
|
|
struct fib6_node *parent;
|
|
struct fib6_node *left;
|
|
struct fib6_node *right;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
struct fib6_node *subtree;
|
|
#endif
|
|
struct rt6_info *leaf;
|
|
|
|
__u16 fn_bit; /* bit key */
|
|
__u16 fn_flags;
|
|
__u32 fn_sernum;
|
|
struct rt6_info *rr_ptr;
|
|
};
|
|
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
#define FIB6_SUBTREE(fn) NULL
|
|
#else
|
|
#define FIB6_SUBTREE(fn) ((fn)->subtree)
|
|
#endif
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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;
|
|
u32 rt6i_peer_genid;
|
|
|
|
struct inet6_dev *rt6i_idev;
|
|
struct inet_peer *rt6i_peer;
|
|
|
|
#ifdef CONFIG_XFRM
|
|
u32 rt6i_flow_cache_genid;
|
|
#endif
|
|
/* more non-fragment space at head required */
|
|
unsigned short rt6i_nfheader_len;
|
|
|
|
u8 rt6i_protocol;
|
|
};
|
|
|
|
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)
|
|
{
|
|
if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
|
|
dst_release(rt->dst.from);
|
|
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
rt->dst.expires = 0;
|
|
}
|
|
|
|
static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
|
|
{
|
|
if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
|
|
dst_release(rt->dst.from);
|
|
|
|
rt->rt6i_flags |= RTF_EXPIRES;
|
|
rt->dst.expires = expires;
|
|
}
|
|
|
|
static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
|
|
{
|
|
if (!(rt->rt6i_flags & RTF_EXPIRES)) {
|
|
if (rt->dst.from)
|
|
dst_release(rt->dst.from);
|
|
/* dst_set_expires relies on expires == 0
|
|
* if it has not been set previously.
|
|
*/
|
|
rt->dst.expires = 0;
|
|
}
|
|
|
|
dst_set_expires(&rt->dst, timeout);
|
|
rt->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;
|
|
|
|
if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
|
|
if (new == rt->dst.from)
|
|
return;
|
|
dst_release(rt->dst.from);
|
|
}
|
|
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
rt->dst.from = new;
|
|
dst_hold(new);
|
|
}
|
|
|
|
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;
|
|
};
|
|
|
|
#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
|
|
#define RT6_TABLE_MAIN RT_TABLE_MAIN
|
|
#define RT6_TABLE_DFLT RT6_TABLE_MAIN
|
|
#define RT6_TABLE_INFO RT6_TABLE_MAIN
|
|
#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
#define FIB6_TABLE_MIN 1
|
|
#define FIB6_TABLE_MAX RT_TABLE_MAX
|
|
#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
|
|
#else
|
|
#define FIB6_TABLE_MIN RT_TABLE_MAIN
|
|
#define FIB6_TABLE_MAX FIB6_TABLE_MIN
|
|
#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
|
|
#endif
|
|
|
|
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);
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
extern int fib6_rules_init(void);
|
|
extern void fib6_rules_cleanup(void);
|
|
#else
|
|
static inline int fib6_rules_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void fib6_rules_cleanup(void)
|
|
{
|
|
return ;
|
|
}
|
|
#endif
|
|
#endif
|