You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
394 lines
8.9 KiB
394 lines
8.9 KiB
/*
|
|
* 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 <linux/notifier.h>
|
|
#include <net/dst.h>
|
|
#include <net/flow.h>
|
|
#include <net/netlink.h>
|
|
#include <net/inetpeer.h>
|
|
#include <net/fib_notifier.h>
|
|
|
|
|
|
#include <linux/netlog.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;
|
|
u16 fc_type; /* only 8 bits are used */
|
|
u16 fc_delete_all_nh : 1,
|
|
__unused : 15;
|
|
|
|
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 nlattr *fc_encap;
|
|
u16 fc_encap_type;
|
|
};
|
|
|
|
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;
|
|
int fn_sernum;
|
|
struct rt6_info *rr_ptr;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
#define FIB6_SUBTREE(fn) NULL
|
|
#else
|
|
#define FIB6_SUBTREE(fn) ((fn)->subtree)
|
|
#endif
|
|
|
|
struct mx6_config {
|
|
const u32 *mx;
|
|
DECLARE_BITMAP(mx_valid, RTAX_MAX);
|
|
};
|
|
|
|
/*
|
|
* 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 __rcu *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;
|
|
|
|
unsigned int rt6i_nh_flags;
|
|
|
|
/* 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;
|
|
|
|
struct list_head rt6i_uncached;
|
|
struct uncached_list *rt6i_uncached_list;
|
|
|
|
struct inet6_dev *rt6i_idev;
|
|
struct rt6_info * __percpu *rt6i_pcpu;
|
|
|
|
u32 rt6i_metric;
|
|
u32 rt6i_pmtu;
|
|
/* 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)
|
|
{
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
rt->dst.expires = 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* Function to safely get fn->sernum for passed in rt
|
|
* and store result in passed in cookie.
|
|
* Return true if we can get cookie safely
|
|
* Return false if not
|
|
*/
|
|
static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
|
|
u32 *cookie)
|
|
{
|
|
struct fib6_node *fn;
|
|
bool status = false;
|
|
|
|
rcu_read_lock();
|
|
fn = rcu_dereference(rt->rt6i_node);
|
|
|
|
if (fn) {
|
|
*cookie = fn->fn_sernum;
|
|
status = true;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
return status;
|
|
}
|
|
|
|
static inline u32 rt6_get_cookie(const struct rt6_info *rt)
|
|
{
|
|
u32 cookie = 0;
|
|
|
|
if (rt->dst.from)
|
|
rt = (struct rt6_info *)(rt->dst.from);
|
|
|
|
rt6_get_cookie_safe(rt, &cookie);
|
|
|
|
return cookie;
|
|
}
|
|
|
|
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);
|
|
dst_release(&rt->dst);
|
|
}
|
|
|
|
void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
|
|
|
|
static inline void rt6_hold(struct rt6_info *rt)
|
|
{
|
|
atomic_inc(&rt->rt6i_ref);
|
|
}
|
|
|
|
static inline void rt6_release(struct rt6_info *rt)
|
|
{
|
|
if (atomic_dec_and_test(&rt->rt6i_ref)) {
|
|
if (strstr(rt->dst.dev->name, "rmnet_data"))
|
|
net_log("rt6_release(): %s : Prefix: %pI6/%u, GW: %pI6, prot: %u\n",
|
|
rt->dst.dev->name, &rt->rt6i_dst.addr, rt->rt6i_dst.plen, &rt->rt6i_gateway, rt->rt6i_protocol);
|
|
rt6_free_pcpu(rt);
|
|
dst_dev_put(&rt->dst);
|
|
dst_release(&rt->dst);
|
|
}
|
|
}
|
|
|
|
enum fib6_walk_state {
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
FWS_S,
|
|
#endif
|
|
FWS_L,
|
|
FWS_R,
|
|
FWS_C,
|
|
FWS_U
|
|
};
|
|
|
|
struct fib6_walker {
|
|
struct list_head lh;
|
|
struct fib6_node *root, *node;
|
|
struct rt6_info *leaf;
|
|
enum fib6_walk_state state;
|
|
bool prune;
|
|
unsigned int skip;
|
|
unsigned int count;
|
|
int (*func)(struct fib6_walker *);
|
|
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;
|
|
unsigned int flags;
|
|
unsigned int fib_seq;
|
|
#define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
|
|
};
|
|
|
|
#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);
|
|
|
|
struct fib6_entry_notifier_info {
|
|
struct fib_notifier_info info; /* must be first */
|
|
struct rt6_info *rt;
|
|
};
|
|
|
|
/*
|
|
* exported functions
|
|
*/
|
|
|
|
struct fib6_table *fib6_get_table(struct net *net, u32 id);
|
|
struct fib6_table *fib6_new_table(struct net *net, u32 id);
|
|
struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
|
|
int flags, pol_lookup_t lookup);
|
|
|
|
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);
|
|
|
|
void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
|
|
void *arg);
|
|
|
|
int fib6_add(struct fib6_node *root, struct rt6_info *rt,
|
|
struct nl_info *info, struct mx6_config *mxc,
|
|
struct netlink_ext_ack *extack);
|
|
int fib6_del(struct rt6_info *rt, struct nl_info *info);
|
|
|
|
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
|
|
unsigned int flags);
|
|
|
|
void fib6_run_gc(unsigned long expires, struct net *net, bool force);
|
|
|
|
void fib6_gc_cleanup(void);
|
|
|
|
int fib6_init(void);
|
|
|
|
int ipv6_route_open(struct inode *inode, struct file *file);
|
|
|
|
int call_fib6_notifier(struct notifier_block *nb, struct net *net,
|
|
enum fib_event_type event_type,
|
|
struct fib_notifier_info *info);
|
|
int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
|
|
struct fib_notifier_info *info);
|
|
|
|
int __net_init fib6_notifier_init(struct net *net);
|
|
void __net_exit fib6_notifier_exit(struct net *net);
|
|
|
|
unsigned int fib6_tables_seq_read(struct net *net);
|
|
int fib6_tables_dump(struct net *net, struct notifier_block *nb);
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
int fib6_rules_init(void);
|
|
void fib6_rules_cleanup(void);
|
|
bool fib6_rule_default(const struct fib_rule *rule);
|
|
int fib6_rules_dump(struct net *net, struct notifier_block *nb);
|
|
unsigned int fib6_rules_seq_read(struct net *net);
|
|
#else
|
|
static inline int fib6_rules_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void fib6_rules_cleanup(void)
|
|
{
|
|
return ;
|
|
}
|
|
static inline bool fib6_rule_default(const struct fib_rule *rule)
|
|
{
|
|
return true;
|
|
}
|
|
static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline unsigned int fib6_rules_seq_read(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
#endif
|
|
|